GB2060808A - Improvements in clutch cables - Google Patents

Improvements in clutch cables Download PDF

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Publication number
GB2060808A
GB2060808A GB8026209A GB8026209A GB2060808A GB 2060808 A GB2060808 A GB 2060808A GB 8026209 A GB8026209 A GB 8026209A GB 8026209 A GB8026209 A GB 8026209A GB 2060808 A GB2060808 A GB 2060808A
Authority
GB
United Kingdom
Prior art keywords
clutch
cable
spring
vibration
pull
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.)
Granted
Application number
GB8026209A
Other versions
GB2060808B (en
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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 GB8026209A priority Critical patent/GB2060808B/en
Publication of GB2060808A publication Critical patent/GB2060808A/en
Application granted granted Critical
Publication of GB2060808B publication Critical patent/GB2060808B/en
Expired 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
    • F16C1/00—Flexible shafts; Mechanical means for transmitting movement in a flexible sheathing
    • F16C1/10—Means for transmitting linear movement in a flexible sheathing, e.g. "Bowden-mechanisms"
    • F16C1/12—Arrangements for transmitting movement to or from the flexible member
    • F16C1/14—Construction of the end-piece of the flexible member; Attachment thereof to the flexible member
    • 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
    • F16C1/00—Flexible shafts; Mechanical means for transmitting movement in a flexible sheathing
    • F16C1/10—Means for transmitting linear movement in a flexible sheathing, e.g. "Bowden-mechanisms"
    • F16C1/101—Intermediate connectors for joining portions of split flexible shafts and/or sheathings
    • 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
    • F16C1/00—Flexible shafts; Mechanical means for transmitting movement in a flexible sheathing
    • F16C1/10—Means for transmitting linear movement in a flexible sheathing, e.g. "Bowden-mechanisms"
    • F16C1/108—Reducing or controlling of vibrations, e.g. by resilient damping of noise
    • 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
    • F16D13/00—Friction clutches
    • F16D13/58—Details
    • F16D13/75—Features relating to adjustment, e.g. slack adjusters
    • F16D13/752—Features relating to adjustment, e.g. slack adjusters the adjusting device being located in the actuating mechanism arranged outside the clutch
    • 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
    • F16D23/00—Details of mechanically-actuated clutches not specific for one distinct type
    • F16D23/12—Mechanical clutch-actuating mechanisms arranged outside the clutch as such
    • 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
    • F16C2361/00—Apparatus or articles in engineering in general
    • F16C2361/43—Clutches, e.g. disengaging bearing

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Mechanical Operated Clutches (AREA)
  • Vibration Prevention Devices (AREA)
  • Flexible Shafts (AREA)

Abstract

A motor vehicle diaphragm spring clutch release pull cable has in series a spring (17 or 22) which, undergoes a change in stress by pull applied to the cable and thus changes the response characteristic of the cable to the effect of vibration. This arrangement attenuates audible and mechanical vibration transmitted by the cable from the vehicle clutch to the interior of the vehicle. <IMAGE>

Description

SPECIFICATION Improvements in clutch cables This invention relates to cable operated friction clutches and is particularly concerned with such clutches as installed in transmission drive lines of motor vehicles.
Cable release of motor vehicle friction clutches is well known, but one problem with clutch cables is that they can transmit vibration, both audible and mechanical, from the transmission drive line to the vehicle clutch pedal. The vibration intensity depends on the particular features of the clutch installation, but on some vehicle models, fitted with diaphragm spring clutches, the resulting noise can be objectionable.
Attempts have been made to attenuate the vibration either at source or in the clutch driven plate, but resulting solutions have not been universally adaptable.
Though the present invention may seem remarkable simply 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 there is provided a motor vehicle diaphragm spring clutch release pull cable having in series a spring which, in use, undergoes a change in stress by pull applied to the cable and thus changes the response characteristic of the cable to the effect of vibration Preferably the series spring is pre-stressed.
Other features are included in the following description of two preferred embodiments shown, by way of example, in the accompanying drawings, in which: Figure 1 is a diagrammatic representation of a typical motor vehicle clutch cable installation; Figure 2 is a representation of one embodiment of the invention; and Figure 3 is a representation of a further embodiment of the invention.
The apparatus to be described is intended for fitting to any conventional cable operated friction clutch as installed in a motor vehicle.
The following specific examples are described with reference to a current 1000 c.c. motor car which, with the standard clutch cable installation, exhibited a clutch cable transmitted vibration resulting in peak accelerations at the clutch pedal of + 129. The frequency of the transmitted vibration was approximately twice engine speed, viz. 1 50Hz. &commat; 4500 r.p.m.
With reference to Fig. 1 there is shown a vehicle engine 11 drivingly connected to a gearbox 1 2 through a friction clutch situated in a bellhousing 1 3. Depression of the clutch pedal 14, mounted on the vehicle bulkhead 1 5 pulls a clutch release cable 1 6 to disengage the clutch.
With reference to Fig. 2 there is shown a tension spring 1 7 in series with the clutch release inner cable 1 8 midway between its free ends. The outer cable 1 9 is supported by a cage 21 in a known manner.
In practice, a spring of 35N/mm rate with just sufficient pre-load to retain the spring in the cage 21 attenuates the transmitted vibra tion by 22,5 dB., the peak clutch pedal acceleration being i 0,9g.
This is sufficient attenuation to render the clutch actuation entirely acceptable but, with this arrangement there is an unavoidable loss of release travel at the clutch as the spring 1 7 extends.
One way of alleviating this problem is to pre-load the spring 1 7 to the level of release load transmitted by the inner cable 18, which in this case is c. 200N.
A convenient way of pre-loading the spring is shown in Fig. 3. A compression spring 22 is caged, in a known manner, to transmit clutch pedal pull loads directly to the inner cable 18.
The pre-load of the compression spring 22 may be readily changed by altering the fitted length of the spring. This may be facilitated by manufacturing the cage from co-operating screwthreaded halves.
In this example, a spring of 35N/mm rate with a pre-load of 1 80N attenuates the trans mitted vibration by 1 3.6 dB., the peak clutch pedal acceleration being + 2.5g.
This again gives sufficient vibration attenua tion to render the clutch actuation entirely acceptable.
The use of a compression spring, in the above embodiment, has the additional advan tage of being fail safe should the spring fracture, the clutch pedal still being capable of transmitting release loads to the clutch.
The above examples are only two of a number of possible alternatives, the principle is, however, adaptable to all clutch cable installations.
1. A motor vehicle diaphragm spring clutch release pull cable having in series a spring which, in use, undergoes a change in stress by pull applied to the cable and thus changes the response characteristic of the cable to the effect of vibration.
2. A pull cable according to Claim 1, wherein the series spring is pre-stressed.
3. A pull cable according to Claim 1 or Claim 2, wherein the spring is a coiled com pression spring which, in use, undergoes compression to transmit tensile cable loads.
4. A pull cable according to any preceding Claim, wherein the series spring is situated at the clutch pedal end of the cable.
5. A motor vehicle diaphragm spring clutch release system including a cable for transmission of clutch release pull loads from
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (7)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Improvements in clutch cables This invention relates to cable operated friction clutches and is particularly concerned with such clutches as installed in transmission drive lines of motor vehicles. Cable release of motor vehicle friction clutches is well known, but one problem with clutch cables is that they can transmit vibration, both audible and mechanical, from the transmission drive line to the vehicle clutch pedal. The vibration intensity depends on the particular features of the clutch installation, but on some vehicle models, fitted with diaphragm spring clutches, the resulting noise can be objectionable. Attempts have been made to attenuate the vibration either at source or in the clutch driven plate, but resulting solutions have not been universally adaptable. Though the present invention may seem remarkable simply 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 there is provided a motor vehicle diaphragm spring clutch release pull cable having in series a spring which, in use, undergoes a change in stress by pull applied to the cable and thus changes the response characteristic of the cable to the effect of vibration Preferably the series spring is pre-stressed. Other features are included in the following description of two preferred embodiments shown, by way of example, in the accompanying drawings, in which: Figure 1 is a diagrammatic representation of a typical motor vehicle clutch cable installation; Figure 2 is a representation of one embodiment of the invention; and Figure 3 is a representation of a further embodiment of the invention. The apparatus to be described is intended for fitting to any conventional cable operated friction clutch as installed in a motor vehicle. The following specific examples are described with reference to a current 1000 c.c. motor car which, with the standard clutch cable installation, exhibited a clutch cable transmitted vibration resulting in peak accelerations at the clutch pedal of + 129. The frequency of the transmitted vibration was approximately twice engine speed, viz. 1 50Hz. &commat; 4500 r.p.m. With reference to Fig. 1 there is shown a vehicle engine 11 drivingly connected to a gearbox 1 2 through a friction clutch situated in a bellhousing 1 3. Depression of the clutch pedal 14, mounted on the vehicle bulkhead 1 5 pulls a clutch release cable 1 6 to disengage the clutch. With reference to Fig. 2 there is shown a tension spring 1 7 in series with the clutch release inner cable 1 8 midway between its free ends. The outer cable 1 9 is supported by a cage 21 in a known manner. In practice, a spring of 35N/mm rate with just sufficient pre-load to retain the spring in the cage 21 attenuates the transmitted vibra tion by 22,5 dB., the peak clutch pedal acceleration being i 0,9g. This is sufficient attenuation to render the clutch actuation entirely acceptable but, with this arrangement there is an unavoidable loss of release travel at the clutch as the spring 1 7 extends. One way of alleviating this problem is to pre-load the spring 1 7 to the level of release load transmitted by the inner cable 18, which in this case is c. 200N. A convenient way of pre-loading the spring is shown in Fig. 3. A compression spring 22 is caged, in a known manner, to transmit clutch pedal pull loads directly to the inner cable 18. The pre-load of the compression spring 22 may be readily changed by altering the fitted length of the spring. This may be facilitated by manufacturing the cage from co-operating screwthreaded halves. In this example, a spring of 35N/mm rate with a pre-load of 1 80N attenuates the trans mitted vibration by 1 3.6 dB., the peak clutch pedal acceleration being + 2.5g. This again gives sufficient vibration attenua tion to render the clutch actuation entirely acceptable. The use of a compression spring, in the above embodiment, has the additional advan tage of being fail safe should the spring fracture, the clutch pedal still being capable of transmitting release loads to the clutch. The above examples are only two of a number of possible alternatives, the principle is, however, adaptable to all clutch cable installations. CLAIMS
1. A motor vehicle diaphragm spring clutch release pull cable having in series a spring which, in use, undergoes a change in stress by pull applied to the cable and thus changes the response characteristic of the cable to the effect of vibration.
2. A pull cable according to Claim 1, wherein the series spring is pre-stressed.
3. A pull cable according to Claim 1 or Claim 2, wherein the spring is a coiled com pression spring which, in use, undergoes compression to transmit tensile cable loads.
4. A pull cable according to any preceding Claim, wherein the series spring is situated at the clutch pedal end of the cable.
5. A motor vehicle diaphragm spring clutch release system including a cable for transmission of clutch release pull loads from a clutch release pedal, wherein the cable includes a series spring which, in use, undergoes a change in stess by pull applied to the cable and thus changes the response characteristic of the cable to the effect of vibration.
6. A clutch release system according to Claim 5, wherein the spring is arranged to be "fail safe" so that, in use, fracture of the spring does not render the clutch release system inoperable.
7. A motor vehicle diaphragm spring clutch release pull cable substantially as described herein and as shown by the accompanying drawings.
GB8026209A 1979-08-15 1980-08-12 Clutch cables Expired GB2060808B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8026209A GB2060808B (en) 1979-08-15 1980-08-12 Clutch cables

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB7928445 1979-08-15
GB8026209A GB2060808B (en) 1979-08-15 1980-08-12 Clutch cables

Publications (2)

Publication Number Publication Date
GB2060808A true GB2060808A (en) 1981-05-07
GB2060808B GB2060808B (en) 1983-06-02

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB8026209A Expired GB2060808B (en) 1979-08-15 1980-08-12 Clutch cables

Country Status (1)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5921118U (en) * 1982-07-30 1984-02-08 株式会社大井製作所 push pull cable
FR2560317A1 (en) * 1984-02-27 1985-08-30 Daikin Mfg Co Ltd Motor vehicle clutch control system
GB2180907A (en) * 1985-09-20 1987-04-08 Nissan Motor Accelerator cable arrangement
FR2658866A1 (en) * 1990-02-28 1991-08-30 Peugeot ANTI-VIBRATORY ARRANGEMENT OF THE CONTROL OF THE COLD STARTING COMPONENT OF A MOTOR VEHICLE.
FR2672653A1 (en) * 1991-02-13 1992-08-14 Teledynamique Sa FLEXIBLE CABLE ANTIVIBRATION CONTROL.
US7163092B2 (en) * 2004-11-10 2007-01-16 International Truck Intellectual Property Company, Llc Clutch linkage with vibration isolation and damping
WO2007062389A1 (en) * 2005-11-23 2007-05-31 L & P Property Management Company Two-piece vibration dampener
CN103133566A (en) * 2011-12-03 2013-06-05 王相军 Clutch spring boosting mechanism

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5921118U (en) * 1982-07-30 1984-02-08 株式会社大井製作所 push pull cable
FR2560317A1 (en) * 1984-02-27 1985-08-30 Daikin Mfg Co Ltd Motor vehicle clutch control system
DE3506769A1 (en) * 1984-02-27 1985-09-05 Kabushiki Kaisha Daikin Seisakusho, Neyagawa, Osaka Clutch control system
GB2180907A (en) * 1985-09-20 1987-04-08 Nissan Motor Accelerator cable arrangement
US4800773A (en) * 1985-09-20 1989-01-31 Nissan Motor Co., Ltd. Accelerator cable connecting device
GB2180907B (en) * 1985-09-20 1990-03-21 Nissan Motor Accelerator cable arrangement
FR2658866A1 (en) * 1990-02-28 1991-08-30 Peugeot ANTI-VIBRATORY ARRANGEMENT OF THE CONTROL OF THE COLD STARTING COMPONENT OF A MOTOR VEHICLE.
EP0444970A1 (en) * 1990-02-28 1991-09-04 Automobiles Peugeot Anti-vibratory arrangement for the choke actuator of a vehicle
FR2672653A1 (en) * 1991-02-13 1992-08-14 Teledynamique Sa FLEXIBLE CABLE ANTIVIBRATION CONTROL.
EP0499531A1 (en) * 1991-02-13 1992-08-19 Acco La Teledynamique Antivibration Bowden cable control
US7163092B2 (en) * 2004-11-10 2007-01-16 International Truck Intellectual Property Company, Llc Clutch linkage with vibration isolation and damping
WO2007062389A1 (en) * 2005-11-23 2007-05-31 L & P Property Management Company Two-piece vibration dampener
CN103133566A (en) * 2011-12-03 2013-06-05 王相军 Clutch spring boosting mechanism

Also Published As

Publication number Publication date
GB2060808B (en) 1983-06-02

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19930812