192 clutches and power-stop control – Elements – Wear compensators
Patent
1992-03-24
1993-11-30
Braun, Leslie A.
192 clutches and power-stop control
Elements
Wear compensators
192109F, 188282, 267226, F16D 1375
Patent
active
052657108
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a hydraulic self-adjusting device for clutch control cables which, in particular, is applicable as a compensating device for the clutch plate lining wear in motor vehicles.
It is known that operation of a motor vehicle clutch causes continuous wear of the clutch plate lining, involving the need to adjust the pedal travel periodically to maintain it constant and in this way compensate for the said wear. Since these adjusting operations are, in general, costly, there are available self-adjusting devices, installed as original equipment in motor vehicles, which compensate for the clutch plate lining wear by the corresponding variation of the length of the control cable linking the clutch mechanism with the control pedal therefor.
Among the known embodiments of the above mentioned self-adjusting devices, the hydrauliuc devices allow for continuous adjustment of the control cable length without any discontinuity occurring therein, unlike the self-adjusting devices based on the coupling of mutually telescopically sliding members using mechanical toothing for setting the cable length.
The hydraulic self-adjusting devices are attached to the clutch mechanism pressure plate operating fork and compensate for the clutch plate lining wear by increasing, to a corresponding extent, the length of the control cable connecting the self-adjusting device to the clutch pedal, without there being any discontinuity caused in the said control cable, as said above.
Generally speaking, the known hydraulic self-adjusting devices for clutch control cables comprise all or some of the following operating members: mechanism pressure plate operating fork and containing a piston fixedly attached to an adjusting rod which is connected at one end thereof to the corresponding end of the control cable extending to the clutch pedal; body member to flow therethrough; self-adjusting device and which bears at the other end thereof against the corresponding end of the said adjusting rod so as to pull permanently against the control cable.
British patent 2,018,933 for "Hydraulically damped automatic play compensation device for motor vehicle clutches" may be cited as an example of known self-adjusting hydraulic devices for control cable lengths. This comprises all the operating members succinctly described above, apart from its own unique characteristic members.
Generally speaking, the known embodiments of self-adjusting hydraulic devices have a large number of components of complex manufacture and assembly, notably increasing the cost of the finished product. For their very complexity and the working conditions to which they are subject, they cause frequent faults and/or misoperation.
SUMMARY OF THE INVENTION
The new hydraulic self-adjusting device for clutch control cables of the invention provides a new embodiment simplifying the manufacturing and assembly of the component parts, allowing the product cost thereof to be reduced and, simultaneously, improving the performance thereof with regard to reliability of operation.
The hydraulic self-adjusting device for clutch control cables of the invention includes the following known members: ends, respectively an open front port provided with an end cap and a closed rear extension allowing it to be connected to the clutch mechanism pressure plate operating fork, said main housing containing a liquid; along a portion delimited by two terminal stop positions and which allows the fluid contained in the main housing to flow therethrough through a pertinent passage; extension of the main housing and attached to the corresponding end of the control cable connecting with the clutch mechanism operating pedal; clutch mechanism control cable is pulled;
In accordance with the invention, it has the following new elements: housing, the other end of said rod remaining permanently in the main housing fixedly attached to the piston; shut-off valve formed by a passage member fixedly attached to the adjusting rod and by a shut-off member which may cut of
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Gabas Carlos
Roca Agustin
Braun Leslie A.
Pitts Andrea
Pujol y Tarrago S.A.
Striker Michael J.
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