US20040156731A1 - Straight-cut motor shaft with pinned eccentric - Google Patents

Straight-cut motor shaft with pinned eccentric Download PDF

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Publication number
US20040156731A1
US20040156731A1 US10/360,517 US36051703A US2004156731A1 US 20040156731 A1 US20040156731 A1 US 20040156731A1 US 36051703 A US36051703 A US 36051703A US 2004156731 A1 US2004156731 A1 US 2004156731A1
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United States
Prior art keywords
eccentric
shaft
pump drive
centerline
drive apparatus
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
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US10/360,517
Inventor
James Bond
Daniel Borgemenke
Matthew Cukovecki
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Delphi Technologies Inc
Original Assignee
Delphi Technologies Inc
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Filing date
Publication date
Application filed by Delphi Technologies Inc filed Critical Delphi Technologies Inc
Priority to US10/360,517 priority Critical patent/US20040156731A1/en
Assigned to DELPHI TECHNOLOGIES INC. reassignment DELPHI TECHNOLOGIES INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BOND, JAMES R., BORGEMENKE, DANIEL N., CUKOVECKI, MATTHEW A.
Publication of US20040156731A1 publication Critical patent/US20040156731A1/en
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/40—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition comprising an additional fluid circuit including fluid pressurising means for modifying the pressure of the braking fluid, e.g. including wheel driven pumps for detecting a speed condition, or pumps which are controlled by means independent of the braking system
    • B60T8/4031—Pump units characterised by their construction or mounting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/0404—Details or component parts
    • F04B1/0413—Cams
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical
    • F04B9/04—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms
    • F04B9/045—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms the means being eccentrics

Definitions

  • This invention relates to eccentric driven pumps, and more particularly to electric motor driven eccentric pumps for controlled brake systems in vehicles.
  • Modem vehicle brake systems having controlled braking functions typically include a controlled braking pump that supplies pressurized hydraulic fluid to the brake system during operation in one or more of the controlled braking functions.
  • controlled braking pumps typically include one or more positive displacement, reciprocating piston assemblies, driven by an eccentric on a pump drive shaft that is in turn driven by an electric motor.
  • the pump drive shaft 12 extends from the rotor 14 of an electric motor 16 .
  • the electric motor 16 is adapted for attachment to a pump housing 18 .
  • the pump drive shaft 12 is a single piece, machined and ground in multiple operations to define a stepped distal end thereof, including an eccentric 20 for receipt of a needle bearing 22 adapted to bear against and drive one or more piston assemblies 24 .
  • Two thrust washers 26 are pressed onto the eccentric 20 on either side of the needle bearing 22 , for retaining the needle bearing on the eccentric 20 .
  • extra partial laminations or a brass counterweight 28 is attached to one end the rotor 14 at a position diametrically opposite from the direction that the eccentric 20 is offset from the centerline 30 of the pump drive shaft 12 .
  • Our invention provides an improved eccentric pump drive apparatus and controlled braking pump assembly, through the use of an eccentric pump drive apparatus having a pump drive shaft with a first end thereof adapted for attachment of an eccentric and an eccentric attached to the first end of the pump drive shaft.
  • the eccentric pump drive apparatus may include an easily fabricated straight-cut pump drive shaft and a stepped eccentric element pinned to one end of the shaft.
  • the pump drive shaft defines a centerline thereof and a bore extending from the first end of the shaft parallel to and displaced an offset distance from the centerline.
  • the eccentric includes a drive element thereof and a stem extending from the drive element for a press fit into the bore of the shaft.
  • the eccentric defines a mass offset from the centerline of the shaft, and the bore may include a portion of the bore extending into the shaft a distance beyond the stem to such a length from the first end of the shaft that a void is formed inside of the shaft for rotationally balancing the eccentric drive apparatus about the centerline of the shaft.
  • the eccentric drive apparatus may include a bearing on the drive element of the eccentric. Where there is a bearing on the drive element, the eccentric and bearing define a mass offset from the centerline of the shaft, and the portion of the bore extending into the shaft may extend beyond the stem to such a length from the first end of the shaft that the eccentric pump drive apparatus is rotationally balanced about the centerline of the shaft, to thereby compensate for the offset mass of the eccentric and bearing.
  • the eccentric pump drive apparatus may include a motor rotor attached to the shaft.
  • Our invention may also take the form of a pump including an eccentric drive apparatus according to our invention, or a method for fabricating an eccentric pump drive apparatus.
  • FIG. 1 is cross-section of a prior controlled braking pump assembly having an eccentric drive apparatus
  • FIG. 2 is a cross-section of a controlled braking pump assembly and eccentric pump drive apparatus, according to our invention.
  • FIG. 3 is a perspective view of an eccentric for the eccentric pump drive apparatus in the pump of FIG. 2.
  • FIG. 2 shows an exemplary embodiment of our invention in the form of a pump 40 for a controlled braking system.
  • the pump assembly 40 includes an electric motor 42 having a rotor 44 defining an axis of rotation 46 , and an eccentric pump drive apparatus 48 .
  • the eccentric pump drive apparatus 48 includes a pump drive shaft 50 attached to the rotor 44 for rotation about the axis of rotation 46 , and having a first end 52 thereof adapted for attachment of an eccentric 54 , and an eccentric 54 attached to the first end 52 of the pump drive shaft 50 by a press fit.
  • the pump drive shaft 50 defines a centerline 56 thereof, extending along the axis of rotation 46 and a bore 58 extending from the first end 52 of the shaft 50 parallel to and displaced an offset distance ‘d’ from the centerline 56 .
  • the eccentric 48 includes a drive element 60 , and a stem 62 extending from the drive element 60 .
  • a needle bearing 64 is slip fitted onto the drive element 60 .
  • the stem 62 is then press fitted into the bore 58 of the shaft 50 .
  • the distal end 52 of the eccentric 54 includes a flange 66 for retaining the bearing 64 on the drive element 60 of the eccentric 54 .
  • the motor 42 is attached to a pump housing 68 , including a pair of reciprocating piston assemblies 70 that are operatively connected to bear against and be driven by the needle bearing 64 .
  • the eccentric 54 and bearing 64 define a mass that is offset from the centerline 56 of the shaft 50 .
  • a portion 72 of the bore 58 extends into the shaft 50 beyond the stem 62 a distance ‘I’ to create a void inside the shaft 50 of sufficient volume that the eccentric pump drive apparatus 48 is rotationally balanced about the centerline 56 of the shaft 50 , to thereby compensate for the offset mass of the eccentric 54 and bearing 64 .
  • the shaft 50 can be fabricated from a straight-cut length of cylindrical material, with the bore 58 drilled into one end 52 at a desired offset distance ‘d’ from the centerline 56 of the shaft.
  • the offset distance ‘d’ can be readily changed, without the major changes in tooling required in prior eccentric drive mechanisms, to move the drive element 60 farther in or out from the centerline 56 of the shaft 50 to respectively reduce or increase the effective displacement of the pump assembly 40 .
  • the stern 62 , drive element 60 , and flange 66 of the eccentric 20 can be fabricated as a stepped pin, using simple turning operations on an automated lathe or a screw machine.

Abstract

An electro-hydraulic pump assembly for a controlled braking system utilizes an eccentric pump drive apparatus including a pump drive shaft having a first end thereof adapted for attachment of an eccentric, and an eccentric attached to the first end of the pump drive shaft. The pump drive shaft defines a centerline thereof, and a bore extending from a first end of the shaft parallel to and displaced an offset distance from the centerline. The eccentric includes a drive element and a stem extending from the drive element for a press fit into the bore of the shaft. The bore extends into the shaft beyond the end of the stem of the eccentric, forming a void inside the shaft for balancing the shaft so that no counterweights need to be added to the eccentric drive apparatus. The pump drive shaft and eccentric are fabricated from straight-cut cylindrical stock by simple turning, drilling, and cylindrical grinding operations.

Description

    TECHNICAL FIELD OF THE INVENTION
  • This invention relates to eccentric driven pumps, and more particularly to electric motor driven eccentric pumps for controlled brake systems in vehicles. [0001]
    • BACKGROUND OF THE INVENTION
  • Modem vehicle brake systems having controlled braking functions, such as anti-lock, traction control, or dynamic stability control, typically include a controlled braking pump that supplies pressurized hydraulic fluid to the brake system during operation in one or more of the controlled braking functions. Such controlled braking pumps typically include one or more positive displacement, reciprocating piston assemblies, driven by an eccentric on a pump drive shaft that is in turn driven by an electric motor. [0002]
  • In a typical prior controlled braking electro-[0003] hydraulic pump assembly 10, as shown in FIG. 1, the pump drive shaft 12 extends from the rotor 14 of an electric motor 16. The electric motor 16 is adapted for attachment to a pump housing 18. The pump drive shaft 12 is a single piece, machined and ground in multiple operations to define a stepped distal end thereof, including an eccentric 20 for receipt of a needle bearing 22 adapted to bear against and drive one or more piston assemblies 24. Two thrust washers 26 are pressed onto the eccentric 20 on either side of the needle bearing 22, for retaining the needle bearing on the eccentric 20. In order to compensate for the material removed from the drive shaft 12 in forming the eccentric, and balance the rotating assembly formed by the drive shaft 12 and the motor rotor 14, extra partial laminations or a brass counterweight 28 is attached to one end the rotor 14 at a position diametrically opposite from the direction that the eccentric 20 is offset from the centerline 30 of the pump drive shaft 12.
  • While a controlled [0004] braking pump assembly 10 constructed as described above functions well, there are several areas in which it would be desirable to make improvements for facilitating manufacturing, reducing cost, and allowing a single same motor and drive shaft assembly to be used for a family of pumps having different displacement requirements. The multiple machining and grinding operations necessary for forming the eccentric 20 are costly. Changing the distance ‘d’ that the eccentric 20 is offset from the centerline 30 of the drive shaft 12, to generate a shorter or longer stroke of the piston assemblies 24 in controlled braking pump assemblies 10 of different displacements, requires significant changes in machining set-ups and tooling. Changing the offset distance ‘d’ also changes the size of the counterweight 28 required for balancing the rotating assembly, thereby necessitating the fabrication and stocking of motors 16 having a different shaft 12, rotor 14 and counterweight 28 for each desired displacement necessary for supporting alternate vehicle applications.
  • What is needed, therefore, is an improved apparatus and method for providing an eccentric pump drive shaft and controlled braking pump addressing one or more of the problems described above. [0005]
    • SUMMARY OF THE INVENTION
  • Our invention provides an improved eccentric pump drive apparatus and controlled braking pump assembly, through the use of an eccentric pump drive apparatus having a pump drive shaft with a first end thereof adapted for attachment of an eccentric and an eccentric attached to the first end of the pump drive shaft. The eccentric pump drive apparatus may include an easily fabricated straight-cut pump drive shaft and a stepped eccentric element pinned to one end of the shaft. [0006]
  • In one form of our invention the pump drive shaft defines a centerline thereof and a bore extending from the first end of the shaft parallel to and displaced an offset distance from the centerline. The eccentric includes a drive element thereof and a stem extending from the drive element for a press fit into the bore of the shaft. [0007]
  • The eccentric defines a mass offset from the centerline of the shaft, and the bore may include a portion of the bore extending into the shaft a distance beyond the stem to such a length from the first end of the shaft that a void is formed inside of the shaft for rotationally balancing the eccentric drive apparatus about the centerline of the shaft. The eccentric drive apparatus may include a bearing on the drive element of the eccentric. Where there is a bearing on the drive element, the eccentric and bearing define a mass offset from the centerline of the shaft, and the portion of the bore extending into the shaft may extend beyond the stem to such a length from the first end of the shaft that the eccentric pump drive apparatus is rotationally balanced about the centerline of the shaft, to thereby compensate for the offset mass of the eccentric and bearing. The eccentric pump drive apparatus may include a motor rotor attached to the shaft. [0008]
  • Our invention may also take the form of a pump including an eccentric drive apparatus according to our invention, or a method for fabricating an eccentric pump drive apparatus. [0009]
  • The foregoing and other features and advantages of our invention are apparent from the following detailed description of exemplary embodiments, read in conjunction with the accompanying drawings. The detailed description and drawings are merely illustrative of the invention rather than limiting, the scope of the invention being defined by the appended claims and equivalents thereof.[0010]
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is cross-section of a prior controlled braking pump assembly having an eccentric drive apparatus; [0011]
  • FIG. 2 is a cross-section of a controlled braking pump assembly and eccentric pump drive apparatus, according to our invention; and [0012]
  • FIG. 3 is a perspective view of an eccentric for the eccentric pump drive apparatus in the pump of FIG. 2.[0013]
    • DETAILED DESCRIPTION
  • FIG. 2 shows an exemplary embodiment of our invention in the form of a [0014] pump 40 for a controlled braking system. The pump assembly 40 includes an electric motor 42 having a rotor 44 defining an axis of rotation 46, and an eccentric pump drive apparatus 48. The eccentric pump drive apparatus 48 includes a pump drive shaft 50 attached to the rotor 44 for rotation about the axis of rotation 46, and having a first end 52 thereof adapted for attachment of an eccentric 54, and an eccentric 54 attached to the first end 52 of the pump drive shaft 50 by a press fit.
  • The [0015] pump drive shaft 50 defines a centerline 56 thereof, extending along the axis of rotation 46 and a bore 58 extending from the first end 52 of the shaft 50 parallel to and displaced an offset distance ‘d’ from the centerline 56. The eccentric 48 includes a drive element 60, and a stem 62 extending from the drive element 60. A needle bearing 64 is slip fitted onto the drive element 60. The stem 62 is then press fitted into the bore 58 of the shaft 50. The distal end 52 of the eccentric 54 includes a flange 66 for retaining the bearing 64 on the drive element 60 of the eccentric 54. As shown schematically in FIG. 2, the motor 42 is attached to a pump housing 68, including a pair of reciprocating piston assemblies 70 that are operatively connected to bear against and be driven by the needle bearing 64.
  • The eccentric [0016] 54 and bearing 64 define a mass that is offset from the centerline 56 of the shaft 50. A portion 72 of the bore 58 extends into the shaft 50 beyond the stem 62 a distance ‘I’ to create a void inside the shaft 50 of sufficient volume that the eccentric pump drive apparatus 48 is rotationally balanced about the centerline 56 of the shaft 50, to thereby compensate for the offset mass of the eccentric 54 and bearing 64.
  • By balancing the [0017] drive apparatus 48 using the void inside of the shaft 50, according to the invention, the counterweights that had to be attached to the rotor for balancing prior eccentric drive mechanisms and pumps can be eliminated, thereby reducing the complexity and weight and facilitating fabrication of the electro-hydraulic pump assembly 40.
  • The [0018] shaft 50 can be fabricated from a straight-cut length of cylindrical material, with the bore 58 drilled into one end 52 at a desired offset distance ‘d’ from the centerline 56 of the shaft. The offset distance ‘d’ can be readily changed, without the major changes in tooling required in prior eccentric drive mechanisms, to move the drive element 60 farther in or out from the centerline 56 of the shaft 50 to respectively reduce or increase the effective displacement of the pump assembly 40. As shown in FIG. 3, the stern 62, drive element 60, and flange 66 of the eccentric 20 can be fabricated as a stepped pin, using simple turning operations on an automated lathe or a screw machine.
  • While the embodiments of the present invention disclosed herein are presently considered to be preferred, various changes and modifications can be made without departing from the spirit and scope of the invention. [0019]
  • The scope of the invention is indicated in the appended claims. We intend that all changes or modifications within the meaning and range of equivalents are embraced by the claims. [0020]

Claims (25)

We claim:
1. An eccentric pump drive apparatus comprising:
a pump drive shaft having a first end thereof adapted for attachment of an eccentric; and
an eccentric attached to the first end of the pump drive shaft.
2. The eccentric pump drive apparatus of claim 1 wherein the eccentric is attached to the first end of the shaft with a press fit.
3. The eccentric pump drive apparatus of claim 1 wherein:
the shaft defines a centerline thereof and a bore extending from the first end of the shaft parallel to and displaced an offset distance from the centerline; and
the eccentric includes drive element thereof and a stem extending from the drive element for a press fit into the bore of the shaft.
4. The eccentric pump drive apparatus of claim 3 including a motor rotor attached to the shaft.
5. The eccentric pump drive apparatus of claim 3 further including a bearing on the drive element of the eccentric.
6. The eccentric pump drive apparatus of claim 5 including a motor rotor attached to the shaft.
7. The eccentric pump drive apparatus of claim 5 wherein the bearing is a needle bearing press fitted onto the drive element.
8. The eccentric pump drive apparatus of claim 7 wherein the eccentric includes a flange at the distal end thereof for retaining the bearing on the drive element of the eccentric.
9. The eccentric pump drive apparatus of claim 3 wherein the eccentric defines a mass offset from the centerline of the shaft, and the bore includes a portion thereof extending into the shaft a distance beyond the stem to such a length from the first end of the shaft that the eccentric pump drive apparatus is rotationally balanced about the centerline of the shaft.
10. The eccentric pump drive apparatus of claim 9 including a motor rotor attached to the shaft.
11. The eccentric pump drive apparatus of claim 9 wherein the eccentric and bearing define a mass offset from the centerline of the shaft, and the portion of the bore extending into the shaft extends a distance beyond the stem to such a length from the first end of the shaft that the eccentric pump drive apparatus is rotationally balanced about the centerline of the shaft, to thereby compensate for the offset mass of the eccentric and bearing.
12. The eccentric pump drive apparatus of claim 11 including a motor rotor attached to the shaft.
13. A pump assembly comprising:
an electric motor having a rotor defining an axis of rotation; and
an eccentric pump drive apparatus including a pump drive shaft attached to the rotor for rotation about the axis of rotation and having a first end thereof adapted for attachment of an eccentric, and an eccentric attached to the first end of the pump drive shaft.
14. The pump assembly of claim 13 wherein the eccentric is attached to the first end of the shaft with a press fit.
15. The pump assembly of claim 13 wherein:
the shaft defines a centerline thereof extending along the axis of rotation and a bore extending from the first end of the shaft parallel to and displaced an offset distance from the centerline; and
the eccentric includes a drive element thereof and a stem extending from the drive element for a press fit into the bore of the shaft.
16. The pump assembly of claim 15 wherein the eccentric defines a mass offset from the centerline of the shaft, and the bore includes a portion thereof extending into the shaft a distance beyond the stem to such a length from the first end of the shaft that the eccentric pump drive apparatus is rotationally balanced about the centerline of the shaft.
17. The pump assembly of claim 15 wherein the eccentric drive element includes a bearing on the drive element of the eccentric.
18. The pump assembly of claim 17 wherein the eccentric and bearing define a mass offset from the centerline of the shaft, and the portion of the bore extends into the shaft a distance beyond the stem to such a length from the first end of the shaft that the eccentric pump drive apparatus is rotationally balanced about the centerline of the shaft, to thereby compensate for the offset mass of the eccentric and bearing.
19. A method for fabricating an eccentric pump drive apparatus, the method comprising:
fabricating a pump drive shaft having a first end thereof adapted for attachment of an eccentric, and
attaching an eccentric to the first end of the pump drive shaft.
20. The method of claim 19 wherein the shaft defines a centerline thereof, and the method further comprises:
forming a bore in the shaft extending from the first end of the shaft parallel to and displaced an offset distance from the centerline;
forming the eccentric to include a drive element thereof and a stem extending from the drive element; and
inserting the stem of the eccentric into the bore.
21. The method of claim 20 wherein the drive element defines a mass, and the method comprises:
extending the bore into the shaft a distance beyond the stem to such a length from the first end of the shaft that the eccentric pump drive apparatus is rotationally balanced about the centerline of the shaft.
22. The method of claim 21 further comprising attaching a motor rotor to the shaft.
23. The method of claim 21 further comprising installing a bearing on the drive element of the eccentric.
24. The method of claim 23 wherein the eccentric and bearing define a mass offset from the centerline of the shaft, and the method comprises:
extending the bore into the shaft a distance beyond the stem to such a length from the first end of the shaft that the eccentric pump drive apparatus is rotationally balanced about the centerline of the shaft.
25. The method of claim 24 further comprising attaching a motor rotor to the shaft.
US10/360,517 2003-02-06 2003-02-06 Straight-cut motor shaft with pinned eccentric Abandoned US20040156731A1 (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110088494A1 (en) * 2008-06-18 2011-04-21 Comelz S.P.A. Device for generating oscillating motion
US20120027633A1 (en) * 2009-02-27 2012-02-02 Danfoss Commercial Compressors Piston refrigeration compressor
US20120023973A1 (en) * 2009-01-09 2012-02-02 Aurelio Mayorca Method and equipment for improving the efficiency of compressors and refrigerators
CN102654163A (en) * 2011-03-01 2012-09-05 美蓓亚株式会社 Rolling bearing, throttle valve device and abs device

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3907070A (en) * 1974-12-09 1975-09-23 Caterpillar Tractor Co Lubricating apparatus for excavator brake assembly and swing assembly and swing transmission
US5057774A (en) * 1989-01-10 1991-10-15 U.S. Philips Corporation Apparatus for measuring the quiescent current of an integrated monolithic digital circuit
US5725287A (en) * 1994-08-05 1998-03-10 Itt Automotive Europe Gmbh Hydraulic motor vehicle brake installation
US5960699A (en) * 1996-09-16 1999-10-05 Robert Bosch Gmbh Hydraulic pump unit
US6087843A (en) * 1997-07-14 2000-07-11 Credence Systems Corporation Integrated circuit tester with test head including regulating capacitor
US6118293A (en) * 1996-06-05 2000-09-12 Imec Inter Uni Micro Electr High resolution (quiescent) supply current system (IDD monitor)
US6239604B1 (en) * 1996-10-04 2001-05-29 U.S. Philips Corporation Method for inspecting an integrated circuit by measuring a voltage drop in a supply line of sub-circuit thereof
US6268665B1 (en) * 1999-05-10 2001-07-31 Mutipower, Inc. Testing battery power source of uninterruptible power supply
US6272970B1 (en) * 1998-10-28 2001-08-14 Robert Bosch Gmbh Motor-and-pump unit for a vehicle hydraulic brake system
US6302552B1 (en) * 2000-05-30 2001-10-16 Delphi Technologies, Inc. Illuminated pointer with tubular shaft
US6378647B1 (en) * 2000-09-26 2002-04-30 Delphi Technologies, Inc. Electric power steering assist mechanism with isolated output shaft

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3907070A (en) * 1974-12-09 1975-09-23 Caterpillar Tractor Co Lubricating apparatus for excavator brake assembly and swing assembly and swing transmission
US5057774A (en) * 1989-01-10 1991-10-15 U.S. Philips Corporation Apparatus for measuring the quiescent current of an integrated monolithic digital circuit
US5725287A (en) * 1994-08-05 1998-03-10 Itt Automotive Europe Gmbh Hydraulic motor vehicle brake installation
US6118293A (en) * 1996-06-05 2000-09-12 Imec Inter Uni Micro Electr High resolution (quiescent) supply current system (IDD monitor)
US5960699A (en) * 1996-09-16 1999-10-05 Robert Bosch Gmbh Hydraulic pump unit
US6239604B1 (en) * 1996-10-04 2001-05-29 U.S. Philips Corporation Method for inspecting an integrated circuit by measuring a voltage drop in a supply line of sub-circuit thereof
US6087843A (en) * 1997-07-14 2000-07-11 Credence Systems Corporation Integrated circuit tester with test head including regulating capacitor
US6272970B1 (en) * 1998-10-28 2001-08-14 Robert Bosch Gmbh Motor-and-pump unit for a vehicle hydraulic brake system
US6268665B1 (en) * 1999-05-10 2001-07-31 Mutipower, Inc. Testing battery power source of uninterruptible power supply
US6302552B1 (en) * 2000-05-30 2001-10-16 Delphi Technologies, Inc. Illuminated pointer with tubular shaft
US6378647B1 (en) * 2000-09-26 2002-04-30 Delphi Technologies, Inc. Electric power steering assist mechanism with isolated output shaft

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110088494A1 (en) * 2008-06-18 2011-04-21 Comelz S.P.A. Device for generating oscillating motion
US20120023973A1 (en) * 2009-01-09 2012-02-02 Aurelio Mayorca Method and equipment for improving the efficiency of compressors and refrigerators
US10961995B2 (en) 2009-01-09 2021-03-30 Aurelio Mayorca Method and equipment for improving the efficiency of compressors and refrigerators
US20120027633A1 (en) * 2009-02-27 2012-02-02 Danfoss Commercial Compressors Piston refrigeration compressor
US8512015B2 (en) * 2009-02-27 2013-08-20 Danfoss Commercial Compressors Piston refrigeration compressor
CN102654163A (en) * 2011-03-01 2012-09-05 美蓓亚株式会社 Rolling bearing, throttle valve device and abs device
US20120223266A1 (en) * 2011-03-01 2012-09-06 Minebea Co., Ltd. Rolling bearing, throttle valve device and abs device

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Owner name: DELPHI TECHNOLOGIES INC., MICHIGAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:BOND, JAMES R.;BORGEMENKE, DANIEL N.;CUKOVECKI, MATTHEW A.;REEL/FRAME:013975/0095

Effective date: 20030206

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION