WO1989003783A1 - A master cylinder assembly - Google Patents

A master cylinder assembly Download PDF

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Publication number
WO1989003783A1
WO1989003783A1 PCT/GB1988/000890 GB8800890W WO8903783A1 WO 1989003783 A1 WO1989003783 A1 WO 1989003783A1 GB 8800890 W GB8800890 W GB 8800890W WO 8903783 A1 WO8903783 A1 WO 8903783A1
Authority
WO
WIPO (PCT)
Prior art keywords
master cylinder
piston
assembly according
cylinder assembly
motor
Prior art date
Application number
PCT/GB1988/000890
Other languages
French (fr)
Inventor
David Parsons
Alastair John Young
Original Assignee
Automotive Products Plc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Automotive Products Plc filed Critical Automotive Products Plc
Publication of WO1989003783A1 publication Critical patent/WO1989003783A1/en

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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
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/74—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive
    • B60T13/745—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive acting on a hydraulic system, e.g. a master cylinder

Definitions

  • the invention relates to a master cylinder assembly and is particularly but not exclusively concerned with a master cylinder assembly for use in a vehicle.
  • Master cylinders are in wide use in the motor vehicle industry wherein they serve in conjunction with an associated slave cylinder to control various systems of the motor vehicle.
  • the clutches of manual transmission vehicles and the vehicle brakes are often actuated by respective cylinders receiving pressure fluid from associated master cylinders actuated by a clutch or brake pedal of the vehicle.
  • the master cylinder is directly and manually actuated by the vehicle operator by suitable actuation of the associated control pedal of the vehicle.
  • manual actuation of a master cylinder is effective to produce the desired resultant action at the associated slave cylinder, there are situations where it is desirable to provide power operation of the master cylinder.
  • EP-A-0223 358 there is described a motor driven actuator for use in a hydraulic circuit of an anti- lock braking system of a vehicle.
  • the actuator includes an assembly comprising a motor and a cylinder, the motor being arranged to effect axial movement of a piston in the cylinder through a drive transmission.
  • the motor is arranged alongside the cylinder and whilst the length of the assembly is reduced as a result of mounting the motor in that way, the width of the assembly is increased which can be disadvantageous.
  • An object of the present invention is to provide an improved and more compact master cylinder assembly which is particularly suitable for use in engaging and disengaging a clutch of a manual transmission vehicle.
  • a master cylinder assembly comprising a hydraulic actuator cylinder, a piston arranged in the cylinder and dividing the cylinder into primary and secondary chambers which, in use, are occupied by hydraulic fluid, a motor for effecting relative movement between the piston and cylinder through a drive transmission at least a part of which drive transmission is arranged within the secondary chamber.
  • the positioning of at least part of the drive transmission within the secondary chamber provides a particularly compact assembly.
  • the arrangement according to the invention is also particularly advantageous over that described in EP-A-0223 358 as the transmission part (or parts) in the secondary chamber will, in use, be immersed in the hydraulic fluid which will provide continuous lubrication for the immersed part or parts.
  • the drive transmission includes a member which sealing extends through a secondary chamber seal for inhibiting escape of hydraulic fluid from the secondary chamber.
  • the member may be an intermediate member between the piston and a drive output shaft of the motor.
  • the intermediate member may transmit drive to another transmission part through a pin, spline, key or the like.
  • the intermediate member may be held drivably fast with the drive output shaft by means of a further pin, spline, key or the like.
  • the transmission may be rotatably mounted within a journal bearing carried by the cylinder within the secondary chamber.
  • the motor which may be an electrically powered motor, has its drive output shaft coaxial with the piston.
  • the motor which may be an electrically powered motor, has its drive output shaft coaxial with the piston.
  • the cylinder may include an elongate housing with the motor mounted on one end of the housing.
  • the relative movement is preferably effected by means of a ballscrew which comprises the aforesaid part of the transmission arranged in the secondary chamber.
  • An anti-rotation means may be provided to prevent relative rotation between the piston and the cylinder during operation of the motor.
  • the anti-rotation means may extend between the piston and cylinder and may include a pin and slot arrangement where, e.g., the pin travels along ' a slot extending in the direction of relative movement between the piston and cylinder.
  • a sensor is provided to sense said relative movement between the piston and cylinder.
  • the sensor e.g., a potentiometer
  • the projection can conveniently form part of the anti-rotation means.
  • the anti-rotation means includes a pin
  • the pin may also serve to operate the sensor.
  • the sensor may include an arm, movement of which rotates an operative element of the sensor, which arm is co- operable with said projection.
  • the pin may simply locate in a slot in the arm so that movement of the pin in a direction axially of the piston and cylinder causes the arm to rotate.
  • Fig.1 is a longitudinal cross-section through a motor and master cylinder for use in a clutch release system of a motor vehicle
  • Fig.2 is a plan view of the master cylinder of Fig.1 with the motor removed.
  • a master cylinder 9 has a housing 10 formed with first and second bores 12, 13.
  • the housing is formed with a compensation port 14 towards the right-hand end of bore 12 as viewed in Fig.1 and with an outlet bore 15.
  • the bore 15 receives a hose fitting 16 to which one end of a hose 17 is connected.
  • the opposite end of the hose 17 communicates with a slave cylinder (not shown).
  • the compensation port 14 communicates with a chamber 18 defined between the housing 10 and a mounting 19 bolted to the housing 10.
  • the mounting 19 carries a rotary potentiometer 20 described below and the chamber 18 communicates with a remote reservoir (not shown) via a hose 22.
  • the cylinder housing 10 is formed with a linear slot 23 in a wall thereof which slot extends in the axial direction of bore 13.
  • the right hand end of the cylinder housing 10 supports a journal bearing 24 and is axially fast with an adaptor 25 which locates spigotally in the bore 13.
  • a piston 26 is slidably mounted in the housing 10 so as to divide the cylinder into a primary chamber 27 and a secondary chamber 28.
  • a primary seal 29 is provided on a cylindrical extension of the piston 26.
  • the piston is normally biased into the position shown by means of a return spring 32 acting between the left hand end of bore 12 and a washer 33 in abutment with the extension 30.
  • the piston 26 has a number of recuperation ports 34 therein and has a hollow cylindrical section 35 which carries a radially extending pin 36.
  • the pin 36 is screwed to the piston and secured in position by a lock nut 37.
  • the pin carries a rotatable roller 38 which is held in position by a nut arrangement 31.
  • the roller 38 can roll with close working clearance along slot 23 as described below.
  • the cylindrical section 35 threadedly supports a ball holder or ball nut 39 of a ballscrew transmission 40, the latter including a screw 42 having a section 42a formed as a fast helix.
  • the ball holder 39 is locked in position by a grub- screw 41 on the piston 26.
  • the right-hand end of the ball holder 39 abuts an intermediate drive transmission member 43 which is mounted in the bearing 24.
  • the abutment between the ball holder 39 and the intermediate transmission member 43 limits the rightward movement of the piston 26 under the influence of the return spring 32.
  • the intermediate transmission member 43 is rotatably locked to the screw 42 by a diametrical pin 44 which includes a shank portion 45 which extends sealingly through a secondary chamber seal 46 carried by the adaptor 25.
  • the intermediate transmission member 43 is drivably connected by means of a sleeve 47 to a drive output shaft 48 of an electric D.C. motor 49.
  • the sleeve 47 is splined to the intermediate transmission member 43 and has a transverse member 50 which locates in a drive slot 52 in the output shaft 48.
  • the motor 49 has a casing 53 bolted to the adaptor 25.
  • the potentiometer 20 has a spindle 54 which is rotatably fast with a radial arm 55.
  • the arm 55 is formed with a slot 56 (as shown clearly in Fig.2) which receives the upper end of pin 36.
  • the chambers 18, 27, 28 and all fluid receiving pipes and ports are filled with hydraulic fluid and bled of air. In that way, the components of ballscrew transmission 40 are immersed in the hydraulic fluid along with the journal bearing 24.
  • the motor 49 drives its output shaft 48 so as to rotate the screw 42 and advance the piston 26 to the left.
  • the compensation port 14 then becomes sealed off from a primary chamber 27 and hydraulic fluid is forced along the pipe 17 to release the clutch.
  • Rotation of the piston 26 as a result of rotation by the screw 42 is prevented by the pin 36 and roller 38, the latter rolling along slot 23 as the piston moves axially.
  • Such movement of the piston also causes the pin 36 to move the arm 55 of the potentiometer 20 thereby rotating the spindle 54.
  • the potentiometer 20 is wired into a circuit which provides a feedback to the external control system indicating the axial position of the piston. In that way it is possible to effect a finely controlled disengagement/re-engagement of the clutch.
  • the piston 26 is allowed to return towards the right under the influence of the clutch spring and return spring 32. Return movement of the piston causes the screw 42 to rotate in the ball holder 39 thereby rotating the motor drive output shaft 48.
  • the motor 49 is left either to free-run to permit continuous axial return movement of the piston or to free-run intermittently through signals received from the external control system to effect a controlled clutch re-engagement.
  • the motor 49 may be driven in a reverse sense so that the piston 26 is moved to the right to permit re-engagement of the clutch.
  • the master cylinder assembly described is advantageous in that the hydraulic fluid provides a certain amount to lubrication both for the ballscrew transmission 40 and the bearing 24. Moreover the mounting of the motor 49 on one end of the housing 10 with its shaft 48 coaxial with the piston 26 provides a compact assembly which can be positioned in relatively small spaces.

Abstract

The assembly comprises a hydraulic master cylinder (9) having a housing (10) for a piston (26). The piston divides the cylinder into primary and secondary chambers (27, 28) which are occupied, in use by hydraulic fluid. A motor (49) is connected to the housing (10) for driving the piston (26) through a ballscrew transmission (40). The ballscrew is arranged within the secondary chamber to provide a compact assembly in which the ballscrew is continuously lubricated by the hydraulic fluid in the secondary chamber (28).

Description

A MASTER CYLINDER ASSEMBLY -i-
The invention relates to a master cylinder assembly and is particularly but not exclusively concerned with a master cylinder assembly for use in a vehicle.
Master cylinders are in wide use in the motor vehicle industry wherein they serve in conjunction with an associated slave cylinder to control various systems of the motor vehicle. For example, the clutches of manual transmission vehicles and the vehicle brakes are often actuated by respective cylinders receiving pressure fluid from associated master cylinders actuated by a clutch or brake pedal of the vehicle. In both cases the master cylinder is directly and manually actuated by the vehicle operator by suitable actuation of the associated control pedal of the vehicle. Whereas manual actuation of a master cylinder is effective to produce the desired resultant action at the associated slave cylinder, there are situations where it is desirable to provide power operation of the master cylinder.
In EP-A-0223 358 there is described a motor driven actuator for use in a hydraulic circuit of an anti- lock braking system of a vehicle. The actuator includes an assembly comprising a motor and a cylinder, the motor being arranged to effect axial movement of a piston in the cylinder through a drive transmission. The motor is arranged alongside the cylinder and whilst the length of the assembly is reduced as a result of mounting the motor in that way, the width of the assembly is increased which can be disadvantageous.
An object of the present invention is to provide an improved and more compact master cylinder assembly which is particularly suitable for use in engaging and disengaging a clutch of a manual transmission vehicle.
According to the invention there is provided a master cylinder assembly comprising a hydraulic actuator cylinder, a piston arranged in the cylinder and dividing the cylinder into primary and secondary chambers which, in use, are occupied by hydraulic fluid, a motor for effecting relative movement between the piston and cylinder through a drive transmission at least a part of which drive transmission is arranged within the secondary chamber.
The positioning of at least part of the drive transmission within the secondary chamber provides a particularly compact assembly. The arrangement according to the invention is also particularly advantageous over that described in EP-A-0223 358 as the transmission part (or parts) in the secondary chamber will, in use, be immersed in the hydraulic fluid which will provide continuous lubrication for the immersed part or parts.
Preferably the drive transmission includes a member which sealing extends through a secondary chamber seal for inhibiting escape of hydraulic fluid from the secondary chamber.
The member may be an intermediate member between the piston and a drive output shaft of the motor. The intermediate member may transmit drive to another transmission part through a pin, spline, key or the like. The intermediate member may be held drivably fast with the drive output shaft by means of a further pin, spline, key or the like.
The transmission may be rotatably mounted within a journal bearing carried by the cylinder within the secondary chamber.
Preferably, the motor, which may be an electrically powered motor, has its drive output shaft coaxial with the piston. Such an arrangement leads to further a compact form of actuator.
The cylinder may include an elongate housing with the motor mounted on one end of the housing.
The relative movement is preferably effected by means of a ballscrew which comprises the aforesaid part of the transmission arranged in the secondary chamber.
An anti-rotation means may be provided to prevent relative rotation between the piston and the cylinder during operation of the motor. Conveniently, the anti-rotation means may extend between the piston and cylinder and may include a pin and slot arrangement where, e.g., the pin travels along' a slot extending in the direction of relative movement between the piston and cylinder.
Preferably a sensor is provided to sense said relative movement between the piston and cylinder. The sensor, e.g., a potentiometer, may be arranged to sense the position of a.projection associated with the piston. Where the aforesaid anti-rotation means is provided, the projection can conveniently form part of the anti-rotation means. For example where the anti-rotation means includes a pin, the pin may also serve to operate the sensor. The sensor may include an arm, movement of which rotates an operative element of the sensor, which arm is co- operable with said projection. By using a pin as mentioned above, the pin may simply locate in a slot in the arm so that movement of the pin in a direction axially of the piston and cylinder causes the arm to rotate.
A master cylinder assembly in accordance with the invention will now be described by way of example with reference to the accompanying drawings in which:
Fig.1 is a longitudinal cross-section through a motor and master cylinder for use in a clutch release system of a motor vehicle, and
Fig.2 is a plan view of the master cylinder of Fig.1 with the motor removed.
A master cylinder 9 has a housing 10 formed with first and second bores 12, 13. The housing is formed with a compensation port 14 towards the right-hand end of bore 12 as viewed in Fig.1 and with an outlet bore 15. The bore 15 receives a hose fitting 16 to which one end of a hose 17 is connected. The opposite end of the hose 17 communicates with a slave cylinder (not shown). The compensation port 14 communicates with a chamber 18 defined between the housing 10 and a mounting 19 bolted to the housing 10. The mounting 19 carries a rotary potentiometer 20 described below and the chamber 18 communicates with a remote reservoir (not shown) via a hose 22. The cylinder housing 10 is formed with a linear slot 23 in a wall thereof which slot extends in the axial direction of bore 13. The right hand end of the cylinder housing 10 supports a journal bearing 24 and is axially fast with an adaptor 25 which locates spigotally in the bore 13.
A piston 26 is slidably mounted in the housing 10 so as to divide the cylinder into a primary chamber 27 and a secondary chamber 28. A primary seal 29 is provided on a cylindrical extension of the piston 26. The piston is normally biased into the position shown by means of a return spring 32 acting between the left hand end of bore 12 and a washer 33 in abutment with the extension 30. The piston 26 has a number of recuperation ports 34 therein and has a hollow cylindrical section 35 which carries a radially extending pin 36. The pin 36 is screwed to the piston and secured in position by a lock nut 37. The pin carries a rotatable roller 38 which is held in position by a nut arrangement 31. The roller 38 can roll with close working clearance along slot 23 as described below. The cylindrical section 35 threadedly supports a ball holder or ball nut 39 of a ballscrew transmission 40, the latter including a screw 42 having a section 42a formed as a fast helix. The ball holder 39 is locked in position by a grub- screw 41 on the piston 26. The right-hand end of the ball holder 39 abuts an intermediate drive transmission member 43 which is mounted in the bearing 24. The abutment between the ball holder 39 and the intermediate transmission member 43 limits the rightward movement of the piston 26 under the influence of the return spring 32. The intermediate transmission member 43 is rotatably locked to the screw 42 by a diametrical pin 44 which includes a shank portion 45 which extends sealingly through a secondary chamber seal 46 carried by the adaptor 25. The intermediate transmission member 43 is drivably connected by means of a sleeve 47 to a drive output shaft 48 of an electric D.C. motor 49. The sleeve 47 is splined to the intermediate transmission member 43 and has a transverse member 50 which locates in a drive slot 52 in the output shaft 48. The motor 49 has a casing 53 bolted to the adaptor 25.
As mentioned above, a rotary potentiometer 20 is provided. The potentiometer 20 has a spindle 54 which is rotatably fast with a radial arm 55. The arm 55 is formed with a slot 56 (as shown clearly in Fig.2) which receives the upper end of pin 36.
In use, the chambers 18, 27, 28 and all fluid receiving pipes and ports are filled with hydraulic fluid and bled of air. In that way, the components of ballscrew transmission 40 are immersed in the hydraulic fluid along with the journal bearing 24.
On receiving a signal from an external control system, the motor 49 drives its output shaft 48 so as to rotate the screw 42 and advance the piston 26 to the left. The compensation port 14 then becomes sealed off from a primary chamber 27 and hydraulic fluid is forced along the pipe 17 to release the clutch. Rotation of the piston 26 as a result of rotation by the screw 42 is prevented by the pin 36 and roller 38, the latter rolling along slot 23 as the piston moves axially. Such movement of the piston also causes the pin 36 to move the arm 55 of the potentiometer 20 thereby rotating the spindle 54. The potentiometer 20 is wired into a circuit which provides a feedback to the external control system indicating the axial position of the piston. In that way it is possible to effect a finely controlled disengagement/re-engagement of the clutch. To re-engage the clutch, the piston 26 is allowed to return towards the right under the influence of the clutch spring and return spring 32. Return movement of the piston causes the screw 42 to rotate in the ball holder 39 thereby rotating the motor drive output shaft 48. The motor 49 is left either to free-run to permit continuous axial return movement of the piston or to free-run intermittently through signals received from the external control system to effect a controlled clutch re-engagement.
Alternatively the motor 49 may be driven in a reverse sense so that the piston 26 is moved to the right to permit re-engagement of the clutch.
The master cylinder assembly described is advantageous in that the hydraulic fluid provides a certain amount to lubrication both for the ballscrew transmission 40 and the bearing 24. Moreover the mounting of the motor 49 on one end of the housing 10 with its shaft 48 coaxial with the piston 26 provides a compact assembly which can be positioned in relatively small spaces.
Whilst specific reference has been made to the use of the master cylinder assembly for clutch actuation, it could be used to actuate slave cylinders of a vehicle braking system.

Claims

1. A master cylinder assembly comprising a hydraulic master cylinder, a piston arranged in the cylinder and dividing the cylinder into primary and secondary chambers which, in use, are occupied by hydraulic fluid, a motor for effecting relative movement between the piston and cylinder through a drive transmission at least a part of which drive transmission is arranged within the secondary chamber.
2. A master cylinder assembly according to Claim 1 in which the drive transmission includes a member which sealing extends through a secondary chamber seal for inhibiting escape of hydraulic fluid from the secondary chamber.
3. A master cylinder assembly according to Claim 2 in which the member of the transmission is an intermediate member between the piston and a drive output shaft of the motor.
4. A master cylinder assembly according to any preceding claim in which the motor has a drive output shaft co-axial with the piston.
5. A master cylinder assembly according to any preceding claim in which the cylinder has an elongate housing and the motor is mounted on one end of the cylinder housing.
6. A master cylinder assembly according to any preceding claim in which the transmission includes a ballscrew for effecting said relative movement, the ballscrew being arranged in said secondary chamber.
7. A master cylinder assembly according to any preceding claim in which an anti-rota ion means is provided to prevent relative rotation between the piston and the cylinder during operation of the motor.
8. A master cylinder assembly according to Claim 7 in which the anti-rotation means acts between the piston and the cylinder.
9. A master cylinder assembly according to Claim 8 in which the anti-rotation means is a pin which locates in a slot extending in the direction of relative movement between the piston and cylinder.
10. A master cylinder assembly according to any preceding claim in which a sensor is provided to sense said relative movement between the piston and cylinder.
11. A master cylinder assembly according to Claim 10 in which the sensor senses the position of a projection associated with the piston.
12. A master cylinder assembly according to Claim 11 and where said anti-rotation means is provided, in which the projection forms part of said anti-rotation means.
13. A master cylinder assembly according to Claim 11 or 12 in which the sensor includes an arm, movement of which rotates an operating element of the sensor, which arm is co-operable with said projection.
PCT/GB1988/000890 1987-10-26 1988-10-19 A master cylinder assembly WO1989003783A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB878724985A GB8724985D0 (en) 1987-10-26 1987-10-26 Hydraulic actuator
GB8724985 1987-10-26

Publications (1)

Publication Number Publication Date
WO1989003783A1 true WO1989003783A1 (en) 1989-05-05

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1988/000890 WO1989003783A1 (en) 1987-10-26 1988-10-19 A master cylinder assembly

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GB (1) GB8724985D0 (en)
WO (1) WO1989003783A1 (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2236153A (en) * 1989-09-21 1991-03-27 Automotive Products Plc Master cylinder assembly
GB2279124A (en) * 1993-06-18 1994-12-21 Fichtel & Sachs Ag Actuating means for a motor vehicle friction clutch comprises master cylinder operated by electric motor via screw and nut drive
GB2279125A (en) * 1993-06-18 1994-12-21 Fichtel & Sachs Ag Actuating means for a motor vehicle friction clutch has master cylinder operated by electric motor via ball and screw
EP0852297A3 (en) * 1997-01-06 1998-11-04 Aichi Kikai Kogyo Kabushiki Kaisha Operation device for a hydraulic master cylinder
DE4326695B4 (en) * 1992-08-10 2009-10-22 Dana Automotive Systems Group, LLC, Toledo Hydraulic actuator for clutch
US11458944B2 (en) * 2019-06-12 2022-10-04 Hyundai Mobis Co., Ltd. Master cylinder of brake for vehicle
EP4194292A1 (en) * 2021-12-07 2023-06-14 BWI (Shanghai) Co., Ltd. Brake-by-wire module including pressure balanced psu piston with wetted ball screw and backup pump assembly
US11808330B2 (en) * 2019-04-25 2023-11-07 Robert Bosch Gmbh Electromechanical brake pressure generator for a hydraulic braking system of a vehicle and method for manufacturing an electromechanical brake pressure generator

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2071796A (en) * 1980-03-18 1981-09-23 Korthaus H Electric motor driven system
FR2535662A1 (en) * 1982-11-04 1984-05-11 Bosch Gmbh Robert MASTER CYLINDER
JPS59186755A (en) * 1983-03-22 1984-10-23 Mazda Motor Corp Electromagnetic servo-brake for automobile
DE3430981A1 (en) * 1984-08-23 1986-03-06 Alfred Teves Gmbh, 6000 Frankfurt Brake device
DE3518715A1 (en) * 1985-05-24 1986-11-27 Daimler-Benz Ag, 7000 Stuttgart Parking brake device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2071796A (en) * 1980-03-18 1981-09-23 Korthaus H Electric motor driven system
FR2535662A1 (en) * 1982-11-04 1984-05-11 Bosch Gmbh Robert MASTER CYLINDER
JPS59186755A (en) * 1983-03-22 1984-10-23 Mazda Motor Corp Electromagnetic servo-brake for automobile
DE3430981A1 (en) * 1984-08-23 1986-03-06 Alfred Teves Gmbh, 6000 Frankfurt Brake device
DE3518715A1 (en) * 1985-05-24 1986-11-27 Daimler-Benz Ag, 7000 Stuttgart Parking brake device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Patent Abstracts of Japan, volume 9, no. 46 (M-360)(1769), 27 February 1985; & JP-A-59186755 (MAZDA K.K.) 23 October 1984 *

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2236153A (en) * 1989-09-21 1991-03-27 Automotive Products Plc Master cylinder assembly
GB2236153B (en) * 1989-09-21 1993-11-10 Automotive Products Plc Master cylinder assembly
DE4326695B4 (en) * 1992-08-10 2009-10-22 Dana Automotive Systems Group, LLC, Toledo Hydraulic actuator for clutch
GB2279124B (en) * 1993-06-18 1997-04-02 Fichtel & Sachs Ag A motor vehicle friction clutch
FR2706553A1 (en) * 1993-06-18 1994-12-23 Fichtel & Sachs Ag Control assembly for a motor vehicle friction clutch.
FR2706552A1 (en) * 1993-06-18 1994-12-23 Fichtel & Sachs Ag Control assembly for a motor vehicle friction clutch.
GB2279125A (en) * 1993-06-18 1994-12-21 Fichtel & Sachs Ag Actuating means for a motor vehicle friction clutch has master cylinder operated by electric motor via ball and screw
GB2279125B (en) * 1993-06-18 1997-08-20 Fichtel & Sachs Ag A motor vehicle friction clutch
GB2279124A (en) * 1993-06-18 1994-12-21 Fichtel & Sachs Ag Actuating means for a motor vehicle friction clutch comprises master cylinder operated by electric motor via screw and nut drive
EP0852297A3 (en) * 1997-01-06 1998-11-04 Aichi Kikai Kogyo Kabushiki Kaisha Operation device for a hydraulic master cylinder
US6047546A (en) * 1997-01-06 2000-04-11 Aichi Kikai Kogyo Kabushiki Kaisha Operation device of a hydraulic master cylinder
US11808330B2 (en) * 2019-04-25 2023-11-07 Robert Bosch Gmbh Electromechanical brake pressure generator for a hydraulic braking system of a vehicle and method for manufacturing an electromechanical brake pressure generator
US11458944B2 (en) * 2019-06-12 2022-10-04 Hyundai Mobis Co., Ltd. Master cylinder of brake for vehicle
EP4194292A1 (en) * 2021-12-07 2023-06-14 BWI (Shanghai) Co., Ltd. Brake-by-wire module including pressure balanced psu piston with wetted ball screw and backup pump assembly

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