192 clutches and power-stop control – Clutches – Operators
Patent
1994-05-13
1995-08-22
Pitts, Andrea L.
192 clutches and power-stop control
Clutches
Operators
192 91A, 192 98, F16D 2508
Patent
active
054431433
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a clutch release apparatus for use with motor vehicle clutch actuation systems.
Motor vehicle transmissions frequently comprise a clutch and a gear box whose input shaft is driven through the clutch so that the drive of the gearbox can be broken by operation of a hydraulicably operable slave cylinder. It has become more common for the slave cylinder to be an annular slave cylinder arranged concentrically of the gear box input shaft.
The concentric slave cylinder is frequently fixed to a face of the gearbox housing within the confines of the gearbox bell housing. Due to dimensional limitations it is becoming necessary for the concentric slave cylinder to become more compact.
Accordingly there is provided a hydraulic annular slave cylinder for a motor vehicle clutch comprising an annular body having inner and outer cylindrical walls forming a hydraulic chamber therebetween, a piston member responsive to hydraulic pressure within the chamber and a release bearing characterised in that the release bearing is mounted on the piston member so that the bearing is concentric with a hydraulic fluid chamber.
Preferably the inner wall extends axially beyond the outer wall and the piston member is sealingly slideable on the radially outer surfaces of the two walls.
The piston member may be sealed to the inner wall by a first seal mounted on the piston member and may be sealed to the outer wall by a second seal mounted on the outer wall.
Preferably the piston member comprises a cylindrical side wall and a radially inwardly projecting flange at one end thereof, the cylindrical side wall being slideably supported on the radially outer surface of the outer cylindrical wall, and radially inner flange sealingly engaging the radially outer surface of the inner wail, and annular relase bearing may be concentric with the fluid chamber formed by the piston member.
The piston member may further include a secondary piston slideably mounted thereon, the secondary piston forming a second fluid chamber, and the annular release bearing is concentric with the second fluid chamber.
Preferably an annular release bearing is mounted on the outer surface of the cylindrical sidewall of the piston member.
The invention will be described by way of example and with reference to following drawings in which:
FIG. 1 is a schematic drawing showing a gearbox and clutch assembly for a transmission.
FIG. 2 is a longitudinal cross section through a first slave cylinder according to the invention.
FIG. 3 is a cross section through a second slave cylinder showing the construction of the body only.
FIG. 4 is a cross section through yet another embodiment of the invention and
FIG. 5 is an enlargement of a portion of FIG. 4 showing the valve mechanism .
Now with reference to FIG. 1, a motor vehicle transmission includes a friction clutch 11, and a gear box assembly 12. The gearbox assembly 12 has an input shaft 13 driven by the clutch 11, and a bell housing 14 which houses the clutch and which in use is bolted against a face of an internal compustion engine (not shown).
The clutch 11 is operated by an annular hydraulic clutch slave cylinder 16 arranged concentrically with the gearbox input shaft 13 and in use engages the radially inner ends of the fingers 19 of a diaphragm spring. The slave cylinder is operated by hydraulic fluid pressure generated by a master cylinder (not shown) which is connected to the slave cylinder 16 by conduit 17.
Now with reference to FIG. 2, there is illustrated, in the actuated condition, an annular clutch slave cylinder 16 arranged concentrically with the gearbox input shaft 13. The slave cylinder 16 has an annular body 21 having an inner cylindrical wall 22 and an outer cylindrical wall 23 spaced radially outwardly thereof. The inner wall 22 extends axially beyond the outer wall 23. The body 21 comprises two parts, a first part 26 including the outer wall 23 is formed from cast aluminium or moulded plastics material (such as glass filled nylon) and has a radially outwardly extending flange 24 with an a
REFERENCES:
patent: 3912058 (1975-10-01), Parkins
patent: 3955660 (1976-05-01), Poon et al.
patent: 4117917 (1978-10-01), Ladin et al.
patent: 4456111 (1984-06-01), Limbacher
patent: 4585107 (1986-04-01), Leigh-Monstevens
patent: 4650054 (1987-03-01), Fadler
patent: 4660702 (1987-04-01), Flotow
patent: 4778039 (1988-10-01), Eliasson
patent: 4869355 (1989-09-01), Corral et al.
patent: 4913276 (1990-04-01), Hayashi et al.
patent: 5083649 (1992-01-01), Baer
patent: 5287951 (1994-02-01), Voit et al.
Automotive Products France SA
Germain Lee A.
Milliken Paul E.
Pitts Andrea L.
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