192 clutches and power-stop control – Clutches – Operators
Patent
1994-02-01
1995-04-11
Bonck, Rodney H.
192 clutches and power-stop control
Clutches
Operators
192 91R, 192111R, 745015R, 745026, 29452, F16D 2512, F16D 2312, F16C 122
Patent
active
054049814
DESCRIPTION:
BRIEF SUMMARY
This invention relates to cables and in particular cables utilised in clutch actuation systems for motor vehicles.
Due to the increasing importance of space in a motor vehicle engine compartment it has become increasingly necessary to utilise hydraulic slave cylinders that can operate a vehicle clutch through a pull mechanism.
Such a pull type hydraulic slave cylinder is shown in the applicants published British patent application 2238362.
The use of a simple cable between the slave cylinder and clutch release lever requires the use of some type of adjuster mechanism to compensate for a build up of manufacturing tolerance in the clutch release system components.
Clutch control systems of the type described in WO089/08786 are sealed pre-filled actuation systems and it is important to ensure that the system slave cylinder has a piston at a preset position in the respective cylinder when the vehicle clutch is new.
The use of a cable adjuster allows presetting of the piston in the cylinder.
The present invention provides a simple means of manually adjusting the lengths of a cable.
According to the invention there is provided a manually adjustable cable having an elongated end fitting for transferring operating leads to a member and having a plurality of longitudinally spaced grooves therein, and a resilient clip which is selectively locatable in one of said grooves, wherein the end fitting comprises two parts, an inner part which is telescopically mounted in an outer part, the inner part having said grooves formed thereon for seating against said member and the clip is abutable against the outer part.
Conveniently the other end of the cable has an attachment means thereon for attachment to a cable pull device and a ferule is located on the cable a preset distance from the attachment means. Preferably the cable forms part of a motor vehicle clutch actuation system and the end fitting abuts a seat on a clutch release lever, and is preferably operated by a hydraulic slave cylinder.
There is also provided a method of initially setting up a clutch actuation system of the above type, wherein the slave cylinder piston is held in a fixed position in the slave cylinder by spacer means interposed between the ferrule and a reference surface on the slave cylinder, and the clutch release lever is moved in a release direction to take out the play in the release mechanism, and the end fitting is adjusted to place its abutment seat against the release lever.
Also according to the invention there is provided a motor vehicle prefilled hydraulic clutch actuation system which includes a hydraulic slave cylinder, the piston of which is attached to one end of a cable of the above type, wherein the piston is attached said other end of the cable away from the elongate end fitting and a spacing collar is inserted between the ferrule and the slave cylinder to accurately position the piston within the master cylinder body.
The invention will now be described by way of example and with reference to the following drawings which:
FIG. 1 shows a cable according to the invention in use forming part of a clutch actuation system, in an extreme condition of adjustment,
FIG. 2 shows the cable of FIG. 1 in the other extreme condition of adjustment,
FIG. 3 is a side view of a clip as used in FIG. 2
FIG. 4 is a view of the inner limb taken on the line IV--IV of FIG. 3.
FIG. 5 a sectional view of the clip as used in FIG. 1, taken on the line V--V of FIG. 1.
FIG. 6 is a schematic drawing of a clutch actuation system utilising a cable of the type shown in FIG. 1, and
FIG. 7 is a schematic view of a space collar as is used to preset the slave cylinder piston position.
With reference to the drawings there is shown part of a motor vehicle clutch actuation system including a hydraulic slave cylinder which is of the type illustrated in British Patent 2238362 in which the piston 11 pulls the clutch operating cable 12 towards the slave cylinder 10.
The cable 12 is connected at one end to the slave cylinder piston (or some member attached thereto) and at its
REFERENCES:
patent: 4687084 (1987-08-01), Leigh-Monstevens et al.
patent: 4889006 (1989-12-01), Kolinske et al.
patent: 5207116 (1993-05-01), Sultze
Harries David A.
Romer Graham P.
Ward Montegue J.
Automotive Products plc
Bonck Rodney H.
Germain Lee A.
Milliken Paul E.
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