DE2217943A1 - Hydraulic release device for clutches, in particular for motor vehicle clutches - Google Patents

Description

Pa'untanviiäll *

Dipl. Ing. F. Weickmann, ⁱ - * - *

Oipl. ing. H. Wßickmann, Dipl. Phys. Or. K. Fincke

Dipl. Ing. F. A. Weidmann, Dipl. Cham. U. Huber

8 Munich Ii, MiHilsti. 22nd

SKP Industrial Trading and Development Company N.V., Amsterdam

Hydraulic release device for clutches, in particular for motor vehicle clutches

The invention relates to a housing and a release bearing hydraulic release device for clutches, especially for motor vehicle clutches, in which the hydraulic release force is applied to the release elements via the non-rotating bearing ring, the rolling elements and the rotating bearing ring the clutch is transmitted.

Such a release device for clutches is described in DOS 2 005 253 known. In this known device, the inner ring of the release bearing extended to a piston which is axially displaceable in a cylinder acted upon by pressure medium. The piston is by means of a piston ring or the like is slidably sealed against the bore surface of the cylinder. To compensate for minor alignment errors and assembly inaccuracies the release bearing can move angularly within small limits; However, movements only in the radial direction are not possible.

The invention is based on the object of a hydraulic release device to create for clutches, which, like the known device, is a compact and ready-to-install unit, but with adjustment movements in radial direction are possible without the piston or the like jamming in the housing. It should be effective, friction-free and low-wear Sealing of the pressurized housing must be ensured.

209848/0641

This task is performed with a hydraulic release device for clutches of the type mentioned at the beginning of the invention solved in that the AusrUoklager is arranged to be axially movable and floating in the housing with radial play.

Thanks to the floating arrangement of the equipment warehouse, this can also be in move radial planes so that the bearing centers itself; Misalignment between the clutch and the release device are compensated with this measure according to the invention.

In a further development of the invention, the annular gap between the essentially cylindrical inner wall of the housing and the Ausrübklager by an elastic Bellows closed to the outside. This is the same as with known release devices intended rubbing seal replaces a frictionless seal without the quality of the seal being impaired; it is much more a much more effective sealing of the pressurized medium Housing guaranteed, which is also less susceptible to damage.

Another feature of the invention is the bore of the release bearing the pressure side by one that rests on the inner ring or outer ring or is made in one piece covered with this trained disc. With this measure according to the invention The effective sealing of the pressure medium-covered housing becomes easy Way further improved. A release device designed in this way is advantageously used in clutches for motor vehicles in which the engine is installed transversely to the direction of travel and the transmission is installed laterally is arranged by the engine, so that no shaft is guided duroh the release device must become.

A simple design of the roll bellows and an uncomplicated attachment the same is achieved naoh another feature of the invention in that the elastic bellows is clamped with its outer edge duroh the housing and at least partially covers the disk and the bearing ring connected to it.

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To keep the elastic bellows free from wear-promoting stresses, can be arranged in an advantageous manner on the pressure side of the disc with the interposition of the rolling bellows a spring-loaded pressure disc be * with also the washer via a screw or the like can be connected to the thrust washer with an axially extending Approach to limit angular movements engages in a recess in the housing.

A further improvement is thereby made according to another feature of the invention achieved that the AusrUckelemente attached to the rotating bearing ring or preferably are formed integrally with this.

Finally, one adds to the low-friction and wear-free seal on the side of the release elements between the inner ring and the outer ring, a non-contact seal.

The invention is explained in more detail below with the aid of some exemplary embodiments, which are shown in the drawings. Figures 1 to 7 show in longitudinal section several versions of the release device according to the invention for couplings.

The hydraulic release device shown in Figure 1 consists essentially from a two-part housing 1 and a release bearing designed as a radial ball bearing 2. The cast part JJ of the housing 1 can with a Flange 4 can be attached to a gearbox or clutch housing 5. That Housing 1 also contains a substantially cylindrical shaped sheet metal part 6, the radial flange 7 of which between the clutch or gear housing 5 and the cast part 3 is clamped and on part of the circumference ttnbördelungen 8 has for attachment to the cast part 3. A threaded hole 9 in the cast part 3 of the housing 1 is used for the connection of a pressure line for the supply of pressure medium into the pressure medium pressurized space Io of the housing 1.

The bore of the release bearing 2 is on the side of the pressurized medium Space Io through a disc 11 made of sheet metal without cutting

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209848 / 06U

Deeokt, which rests on the end face of the outer ring 12 «the outer surface of the ring encased and on the other side in a ring rutted radially inwards * part 13 runs out, which covers the AusrUoklager 2. In the bore of the inner ring

14 a release element 15 for actuating the clutch is attached with a press fit

Between the AusrUoklager 2 and the substantially cylindrical Bleohformteil 6 of the housing 1, a relatively wide annular gap 16 is provided so that radial and angular movements of the AusrUoklagers 2 with the AusrUokelement

15 for setting and centering are possible. To the outside is the gap 16 and thus also the pressurized medium © space Io of the housing 1 through a elastic bellows 17 made of reinforced rubber, rubber or similar material closed. The rolling bellows 17 covers the disc 11 and part of the Outer ring 12 and is between the cast part 3 of the housing 1 and the Formed sheet metal part 6 clamped. With the interposition of the rolling bellows 17 lies on of the disk 11 ″ ine pressure disk 18, which is supported by a spring 19, which on an annular pin 2o of the housing 1 is guided, is acted upon. The essentially cylindrical shaped sheet metal part 6 is slightly radial at its free end angled inward, so that the spring 19, the AusrUoklager 2 in the not built State of the release device does not push out of the housing 1;

To disengage the clutch, a pressure is generated in the room Io that points to the Disc 11 and thus also on the non-rotating outer ring 12 acts over the rolling elements 21 transfer the release force to the inner ring 14 and thereby to the release elements 15. This means that the entire equipment warehouse 2 acts as a piston that acts on the release levers or the like AusrUokelement 15 - in the figure 1 to the right - soled and thus a Separation of the clutch causes.

The hydraulic AuerUokvorriohtung shown in Figure 2 for clutches under * differs from the one just explained only by the training and attachment of the thrust washer 18. Under unfavorable circumstances, the position of the device due to the friction on the rolling elements 21 a small torque from the rotating inner ring 14 to the outer ring 12 and thus to the RoIl-

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Bellow 17 transferred. The rolling bellows 17 is thereby subjected to shear stress. Uta rotation of the outer ring 12 and thus stress on the rolling bellows to be prevented by shear forces ”is the disk 11 attached to the outer ring 12 connected to the thrust washer 18 via a screw 22, which in turn is connected to an axially extending shoulder 23 is provided «which is used to limit angular movements engages in a recess 24 in the housing 1. With this measure a turning of the thrust washer l8 and thus a consequent stress of the rolling bellows 17 effectively prevented.

The hydraulic release device shown in Figure 3 is based on the Execution according to Figure 1. The main difference is that the inner ring 14 and the outer ring 12 are designed as angular contact ball bearings AusrUcklagers 2 are made by non-cutting shaping from sheet metal. Taking advantage of this design, the disk 11 is integral with the outer ring 12 formed "and next to it the release element 15" which is not on The clutch release lever, which is also shown, acts "formed in one piece with the inner ring 14", similar to the outer ring 12 "on the bore side closed is. Various advantages are achieved with these measures. On the one hand there is the closed and rotating during the disengagement process Inner ring in itself very stable and light, which has a positive effect on the vibration behavior and low noise. On the other hand, the interior of the bearing of the release bearing 2 can be sealed without any problems will be discussed in more detail.

At the free end of the outer ring 12, an angle ring 25 is attached «the in a counter-ring 26 made of elastic material engages · The counter-ring 26 is pushed onto the inner ring 14, which is extended axially to the release element 15 provided with a radial flange. The counter ring 26 rests on the radial face of the release element 15 and is axially secured on the side facing the release bearing 2 by some « Sioken 27 · angled ring 25 and counter ring worked into the inner ring 14 26 together form a non-contact seal.

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With this inventive embodiment of the Ausrüc & Lager 2 1st a very good lubrication guaranteed. The rotating inner ring 14 promotes due to from centrifugal forces the lubricant inside the bearing to the rolling elements 21 j so that they are constantly lubricated during operation. The to the non-contact seal forming a build-up of lubricant causes the penetrating Lubricant is constantly pushed back into the release bearing 2 by the rotating and thus lubricant-promoting inner ring 14. At a A certain gap width between the lubricant accumulation and the rotating inner ring 14 is created by the penetration of the lubricant, a grinding Very low friction seal.

The hydraulic release device according to Figure 4 is suitable for clutches of motor vehicles in which the clutch is installed between the engine and transmission is, so that a shaft must be guided duroh the release device. The release device is based on the embodiment according to FIG. 3, however the inner ring 14 and the outer ring 12 from the aforementioned OrUnds are on the bore side not closed. The outer ring 12 engages with an axial projection 28 in the bore of the inner ring 14. A major difference from the previous ones The explanations explained consists in the fact that the rolling bellows 17 rolls on the bore side on a sliding sleeve 29. Duroh this is the rolling bellows 17 on the bore side clamped to the housing 1. Between the axial extension 28 of the outer ring 12 and the cutting sleeve 29, as well as between the outer ring 12 and the shaped sheet metal part 6 of the housing 1, a relatively wide annular gap 3o is provided, so that the AusrUoklager 2 can adjust in the radial direction.

The hydraulic release device shown in Figure 5 is a variant that shown in Figure JJ. In the embodiment according to FIG. 5, the release element is 15, which is designed in the shape of a pot here, in one piece with the outer ring 12 - this is the bearing ring supporting the outer raceway of the rolling elements 21 - produced, while the inner ring l4 - that is, the bearing ring carrying the inner raceway of the rolling elements 21 - does not rotate and is integral with the disk 11 is trained. When the pressure builds up in the space Io of the housing 1, the inner ring becomes 14 is pressurized with the disk 11U via the rolling bellows 17 and

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- Moved to the right in Figure 5, so that the release element 15 connected to the outer ring 12 presses on the release lever of the clutch. The spring 19 acting on the thrust washer 18 serves to preload the angular contact ball bearing and ensures that the rolling elements 21 are constantly in contact with the raceways of the inner ring 1K and the outer ring 12 *

As can be seen from the upper part of FIG. 5, it serves to seal the interior of the bearing an angle ring 25 which is attached to the inner ring l4 and with the Outer ring 12 forms a non-contact seal. A variant of this is Shown in the lower part of Figure 5, in which in the inner ring l4 also Angled ring 25 is pressed in with a ring pushed onto the outer ring 12 Jl forms a non-contact seal. In both cases it is the sealing one and self-sewing lubricating effect similar to the version according to the figure

Finally, in Figure 6, a hydraulic release device is shown, in which, as in the embodiment just described, the inner ring 14 is stationary and the outer ring 12 rotates. However, similar to that in Figures 1 and 2, the release bearing 2 is designed as a solid deep groove ball bearing, wherein the pressurized space Io closes off to the outside Disk 11 rests against the inner ring l4 and is in a radially directed part continues, which engages around the outer surface of the outer ring 12 with play and protrudes with an axial part into the annular gap 16, so that the outer ring 12 can rotate freely. The Ausrüokelement 15 is made of sheet metal without cutting and attached to the outer ring 12 with an extension.

In the hydraulic release device sketched in FIG. 7, the release bearing 2 is via a piston 32 on which it is fastened with the inner ring 14 is guided in the housing 1 to be axially movable and floating with radial play. In principle, the release device is designed similarly to that in FIG Figure 4, however, the release bearing 2 is a radial deep groove ball bearing with a solid Inner ring 14 and solid outer ring 12 designed, with a wave through the Release device can be performed.

209848/0641

Claims (9)

Claims 1. Hydraulic release device consisting of a housing and a release bearing for clutches in which the hydraulic release force via the non-rotating bearing ring, the rolling elements and the rotating bearing ring is transferred to the release elements of the clutch, characterized in that that the release bearing (2) is arranged to be axially movable and floating with radial play in the housing (l). 2. Hydraulic release device according to claim 1, characterized daduroh, that the annular gap (16) between the essentially cylindrical inner wall of the housing (1) and the AusrUoklager (2) by an elastic Roll bellows (17) is closed to the outside. 3. Hydraulic release device according to Anspruoh 1 or 2, daduroh characterized, that the bore of the release bearing (2) on the pressure side duroh a disc (11) resting on the inner ring (l4) or outer ring (12) or formed in one piece with this is covered. 4. Hydraulic release device naoh Anspruoh J5, daduroh marked, that the elastic bellows (17) with its outer edge duroh the housing (l) is clamped and the disc (11) and the associated. Bearing ring at least partially covered. 5 Hydraulic release device according to Claim 4, characterized in that that on the pressure side of the disc (11) with the interposition of the rolling bellows (17) a spring-loaded pressure disc (18) is arranged. Page 2 - 209848/0641 6. Hydraulische AusrUokvorriohtung naoh claim 5 »characterized» that the disc (11) via a screw (22) or the like with the
The thrust washer (18) is connected to a recess (24) in the housing (1) with an axially extending shoulder (25) to limit angular movements. 7 * Hydraulic equipment according to one of the preceding claims « characterized in that the AusrUokelement (15) on the rotating bearing ring attached or once formed with this. 8. Hydraulic release device according to one of the preceding claims » characterized by a contactless seal arranged on the side of the release elements (15) between the inner ring (14) and the outer ring (12). 9. Hydraulic AusrUokvorriohtung according to one of the preceding claims, characterized in that the AusrUoklager (2) via a piston (32), with which it is connected, is guided in a floating manner in the housing. 209848/0641 Blank page