GB2058272A - Vibration attenuator - Google Patents

Vibration attenuator Download PDF

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Publication number
GB2058272A
GB2058272A GB8026263A GB8026263A GB2058272A GB 2058272 A GB2058272 A GB 2058272A GB 8026263 A GB8026263 A GB 8026263A GB 8026263 A GB8026263 A GB 8026263A GB 2058272 A GB2058272 A GB 2058272A
Authority
GB
United Kingdom
Prior art keywords
master cylinder
clutch
hydraulic
pushrod
vibration
Prior art date
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.)
Withdrawn
Application number
GB8026263A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Automotive Products PLC
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
Priority to GB8026263A priority Critical patent/GB2058272A/en
Publication of GB2058272A publication Critical patent/GB2058272A/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C7/00—Connecting-rods or like links pivoted at both ends; Construction of connecting-rod heads
    • F16C7/04—Connecting-rods or like links pivoted at both ends; Construction of connecting-rod heads with elastic intermediate part of fluid cushion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D25/00—Fluid-actuated clutches
    • F16D25/12—Details not specific to one of the before-mentioned types

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)

Abstract

An input pushrod for the hydraulic master cylinder of a motor vehicle clutch release system includes a resilient member in series to attenuate vibration transmitted from the vehicle clutch through the master cylinder to the driver's clutch operating pedal.

Description

SPECIFICATION Vibration attenuator This invention relates to attenuation of vibration transmitted through hydraulic liquid and is particularly applicable to hydraulic clutch release systems for motor vehicles.
Such release systems are well known and usually comprise a hydraulic master cylinder actuable by a driver's clutch pedal and connected through a fluid pressure duct to a hydraulic slave cylinder. The slave cylinder mechanically operates the clutch release mechanism.
One problem with such systems is that, in use, vibration can be transmitted from the vehicle clutch and through the release mechanism, the fluid pressure duct and the master cylinder to the driver's clutch pedal. The resulting audible noise and mechanical vibration can be objectionable to occupants of the motor vehicle.
The present invention seeks to provide a generally adaptable solution to the aforementioned problem. Though the invention may seem remarkably simple in concept, it is the culmination of considerable engineering effort to find an economical solution which is suitable for differing clutch installations.
According to the invention an input push rod for a hydraulic master cylinder, said pushrod being capable of transmitting thrust loads from a driver's clutch pedal to the master cylinder, is provided with a resilient member in series so that, in use, vibration transmitted through the master cylinder is attenuated.
Preferably, the resilient member, which may be a coil spring or a rubber pad, exhibits a low hysteresis loss so that the transmitted vibration is absorbed within the resilient member.
Other features of the invention are included in the following description of a preferred embodiment shown, by way of example only, on the accompanying drawing, in which is depicted a schematic illustration of a typical hydraulic clutch release system incorporating the invention.
A master cylinder 11, including the usual liquid reservoir 12, has a piston 13 movable in response to a thrust on a driver's clutch pedal 14 to generate a hydraulic line pressure to a slave cylinder 15. Consequent movement of a slave cylinder piston 1 6 actuates the release lever 1 7 of a friction clutch (not shown).
The master cylinder input pushrod 1 8 incorporates in series a coiled compression spring 19.
The spring 1 9 acts, in use, to attenuate vibration transmitted through the liquid column from the release lever 1 7 to the clutch pedal 14.
The transmission of vibration to the clutch pedal 14 tends to be associated with high pedal loads. The coil spring may, therefore, be advantageously pre-stressed to act as a strut until the critical pedal load is reached. Such an arrangement is important where little loss of clutch pedal travel, as the spring compresses under load, can be tolerated. The rate and pre-load of the spring may be readily altered to suit different clutch installations.
Under certain conditions of use the preload of the spring may be above the release load of the clutch.
1. An input pushrod for a hydraulic master cylinder, said pushrod being capable of transmitting thrust loads from a driver's clutch pedal to the master cylinder, is provided with a resilient member in series so that, in use, vibration transmitted through the master cylinder is attenuated.
2. A pushrod according to Claim 1, wherein the resilient member is a rubber pad exhibiting a low hysteresis loss.
3. A pushrod according to Claim 1, wherein the resilient member is pre-loaded.
4. A hydraulic master cylinder for a motor vehicle clutch release system wherein the master cylinder has an input pushrod including resilient means in series so that, in use, vibration transmitted through the master cylinder to a driver's clutch pedal is attenuated.
5. An input pushrod for a hydraulic master cylinder substantially as described herein and as illustrated by the accompanying drawing.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (5)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Vibration attenuator This invention relates to attenuation of vibration transmitted through hydraulic liquid and is particularly applicable to hydraulic clutch release systems for motor vehicles. Such release systems are well known and usually comprise a hydraulic master cylinder actuable by a driver's clutch pedal and connected through a fluid pressure duct to a hydraulic slave cylinder. The slave cylinder mechanically operates the clutch release mechanism. One problem with such systems is that, in use, vibration can be transmitted from the vehicle clutch and through the release mechanism, the fluid pressure duct and the master cylinder to the driver's clutch pedal. The resulting audible noise and mechanical vibration can be objectionable to occupants of the motor vehicle. The present invention seeks to provide a generally adaptable solution to the aforementioned problem. Though the invention may seem remarkably simple in concept, it is the culmination of considerable engineering effort to find an economical solution which is suitable for differing clutch installations. According to the invention an input push rod for a hydraulic master cylinder, said pushrod being capable of transmitting thrust loads from a driver's clutch pedal to the master cylinder, is provided with a resilient member in series so that, in use, vibration transmitted through the master cylinder is attenuated. Preferably, the resilient member, which may be a coil spring or a rubber pad, exhibits a low hysteresis loss so that the transmitted vibration is absorbed within the resilient member. Other features of the invention are included in the following description of a preferred embodiment shown, by way of example only, on the accompanying drawing, in which is depicted a schematic illustration of a typical hydraulic clutch release system incorporating the invention. A master cylinder 11, including the usual liquid reservoir 12, has a piston 13 movable in response to a thrust on a driver's clutch pedal 14 to generate a hydraulic line pressure to a slave cylinder 15. Consequent movement of a slave cylinder piston 1 6 actuates the release lever 1 7 of a friction clutch (not shown). The master cylinder input pushrod 1 8 incorporates in series a coiled compression spring 19. The spring 1 9 acts, in use, to attenuate vibration transmitted through the liquid column from the release lever 1 7 to the clutch pedal 14. The transmission of vibration to the clutch pedal 14 tends to be associated with high pedal loads. The coil spring may, therefore, be advantageously pre-stressed to act as a strut until the critical pedal load is reached. Such an arrangement is important where little loss of clutch pedal travel, as the spring compresses under load, can be tolerated. The rate and pre-load of the spring may be readily altered to suit different clutch installations. Under certain conditions of use the preload of the spring may be above the release load of the clutch. CLAIMS
1. An input pushrod for a hydraulic master cylinder, said pushrod being capable of transmitting thrust loads from a driver's clutch pedal to the master cylinder, is provided with a resilient member in series so that, in use, vibration transmitted through the master cylinder is attenuated.
2. A pushrod according to Claim 1, wherein the resilient member is a rubber pad exhibiting a low hysteresis loss.
3. A pushrod according to Claim 1, wherein the resilient member is pre-loaded.
4. A hydraulic master cylinder for a motor vehicle clutch release system wherein the master cylinder has an input pushrod including resilient means in series so that, in use, vibration transmitted through the master cylinder to a driver's clutch pedal is attenuated.
5. An input pushrod for a hydraulic master cylinder substantially as described herein and as illustrated by the accompanying drawing.
GB8026263A 1979-09-13 1980-08-12 Vibration attenuator Withdrawn GB2058272A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8026263A GB2058272A (en) 1979-09-13 1980-08-12 Vibration attenuator

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB7931713 1979-09-13
GB8026263A GB2058272A (en) 1979-09-13 1980-08-12 Vibration attenuator

Publications (1)

Publication Number Publication Date
GB2058272A true GB2058272A (en) 1981-04-08

Family

ID=26272858

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8026263A Withdrawn GB2058272A (en) 1979-09-13 1980-08-12 Vibration attenuator

Country Status (1)

Country Link
GB (1) GB2058272A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4998609A (en) * 1990-01-16 1991-03-12 Automotive Products Plc Damper for hydraulic clutch actuator
US5070983A (en) * 1990-10-29 1991-12-10 Automotive Products Plc Damper for hydraulic clutch actuator
WO1997018115A1 (en) * 1995-11-14 1997-05-22 Robert Bosch Sistemi Frenanti S.P.A. Hydraulic pressure generator with vibration damping
GB2342706A (en) * 1998-08-06 2000-04-19 Mannesmann Sachs Ag Clutch actuator with protection against overload and/or faulty operation
US6430928B1 (en) 2000-07-20 2002-08-13 Automotive Products (Usa), Inc. Dual action damper for hydraulic clutch actuator
GB2356678B (en) * 1999-06-30 2004-03-03 Automotive Prod Co Ltd Master cylinder assembly pushrod impact isolators
US7163092B2 (en) * 2004-11-10 2007-01-16 International Truck Intellectual Property Company, Llc Clutch linkage with vibration isolation and damping
CN112503114A (en) * 2020-11-27 2021-03-16 安徽江淮汽车集团股份有限公司 Separation and reunion main pump and vehicle

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4998609A (en) * 1990-01-16 1991-03-12 Automotive Products Plc Damper for hydraulic clutch actuator
US5070983A (en) * 1990-10-29 1991-12-10 Automotive Products Plc Damper for hydraulic clutch actuator
WO1997018115A1 (en) * 1995-11-14 1997-05-22 Robert Bosch Sistemi Frenanti S.P.A. Hydraulic pressure generator with vibration damping
GB2342706A (en) * 1998-08-06 2000-04-19 Mannesmann Sachs Ag Clutch actuator with protection against overload and/or faulty operation
US6234290B1 (en) 1998-08-06 2001-05-22 Mannesmann Sachs Ag Actuating installation for pneumatic clutch actuation with overload protection and/or incorrect-operation protection
GB2342706B (en) * 1998-08-06 2003-06-11 Mannesmann Sachs Ag Actuator for a vehicle clutch with protection against overload and/or faulty operation
ES2190292A1 (en) * 1998-08-06 2003-07-16 Mannesmann Sachs Ag Actuating installation for pneumatic clutch actuation with overload protection and/or incorrect-operation protection
GB2356678B (en) * 1999-06-30 2004-03-03 Automotive Prod Co Ltd Master cylinder assembly pushrod impact isolators
US6430928B1 (en) 2000-07-20 2002-08-13 Automotive Products (Usa), Inc. Dual action damper for hydraulic clutch actuator
US6789388B1 (en) 2000-07-20 2004-09-14 Automotive Products (Usa), Inc. Triple action damper for hydraulic clutch actuator
US7163092B2 (en) * 2004-11-10 2007-01-16 International Truck Intellectual Property Company, Llc Clutch linkage with vibration isolation and damping
CN112503114A (en) * 2020-11-27 2021-03-16 安徽江淮汽车集团股份有限公司 Separation and reunion main pump and vehicle

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)