DE2923539A1 - SLIDE BEARING RELEASER - Google Patents

Description

2S23539

FICHTEL & SACHS AG - SCHWEINFURT

PATENT AND USED SAMPLE APPLICATION Plain bearing releaser

The invention relates to a slide bearing releaser, preferably for clutches of motor vehicles with internal combustion engines.

It is already known in the case of slide bearing releasers of motor vehicle clutches Use graphite rings. However, these graphite rings do not meet today's requirements for motor vehicle clutches grown more.

It is therefore the object of the invention to create a sliding bearing release that meets the requirements of today's motor vehicle operation has grown and is as simple as possible to build and easy to manufacture.

This object is achieved according to the invention in that between the first ring element rotating with the release parts of the clutch and that on a release fork or a sliding sleeve axially displaceable, but non-rotatably arranged second ring element a sliding element is arranged. This sliding element is the same the sliding movement between the first ring element, which is present with the release parts, at least during the release process the clutch rotates, and the second ring element, which is rotationally fixed but axially displaceable.

This sliding element is advantageously made of ceramic or a similar material with a low coefficient of friction and hard Consistency. This ensures that there are favorable sliding properties between the relatively rotatable components, so that a correspondingly long service life can be expected. The ceramic sliding element has a very high hardness on, on the other hand, it is able, for example, through its

030050 / Ό561

Porosity to absorb lubricant and thus as a lubricant supply to act.

However, it is also easily possible to manufacture the sliding element from a plastic that has good sliding properties. Such a sliding element is particularly inexpensive to manufacture and, due to its relatively low weight, is insensitive against vibrations.

According to a further feature of the invention, the sliding element is loose between the first ring element and the second ring element arranged. This loose arrangement ensures that the relative movement between the circumferential first ring element and the ring element fixed in the circumferential direction to two distributed on different levels, so that the sliding speed is reduced by about half in each case. So that's it, for example possible to distribute occurring heat more evenly and to dissipate it more quickly.

According to the invention it is proposed that the axial boundary surfaces of the sliding element extend essentially radially and the sliding element is provided with radial play. Through this radial play in connection with the essentially radially extending Boundary surfaces result in a further improvement in the self-centering effect of the slide bearing release, which is in principle already present in that the first ring element with the diaphragm spring revolves around the second ring element is fixedly arranged on the sliding sleeve and the sliding element is loosely arranged between the two.

However, it is also easily possible for the sliding element to be non-rotatable to be arranged, as a result of which, for example, the production cost of the slide bearing disengagement is lower; as a component completely can be saved.

According to the invention it is further proposed that the first ring element at least on the contact surface towards the sliding element is provided with a hard layer. Such a design improves the sliding properties and wear behavior, this ring element, for example, made of steel, sintered metal,

© 3QO5 0 / O561

Can be made of iron or plastic.

The invention further proposes that the first ring element is connected and fixed in a rotationally fixed manner to the clutch via projections which engage in the spaces between the release elements. With such a design, a particularly low-wear interaction between the release parts, for example the diaphragm spring tongues, and the first ring element is achieved. This positive coupling of the two. ¹ parts are prevented from any relative rotation between them.

The invention will then be described on the basis of two exemplary embodiments explained in more detail. They show in detail:

Fig. 1 shows the longitudinal section through a slide bearing releaser with a loosely arranged sliding element;

Fig. 2 shows the longitudinal section through a slide bearing ~ releaser with a fixed sliding element,

Fig. 1 shows the longitudinal section through a slide bearing releaser. The sliding sleeve 3 is guided axially displaceably on a tube 7, which is fixed, for example, to the gear housing (not shown). Firmly on. A second ring element k is arranged on the sliding sleeve 3 and has an approximately radially extending boundary surface 6. Subsequently to this boundary surface 6, a sliding element 5 is arranged, which is provided with radial play with respect to the sliding sleeve 3. A first ring element 1 is arranged between this sliding element 5 and the tongue ends of the diaphragm spring 2, the boundary surfaces 6 running approximately radially between the sliding element 5 and the two ring elements 1 and 4. The first ring element 1, which is also provided with radial play with respect to the sliding sleeve 3, is arranged in the radial direction at a distance from an elastic stop which is fastened on the sliding sleeve 3.

The mode of operation of the releaser shown is as follows:

By a release fork, not shown, the sliding sleeve 3 together with the second ring element 4 for the purpose of coupling

030050/0561

control actuation moved to the left. The one rotating with the coupling Diaphragm spring 2 is moved to the left against the force of its elastic deformation. The first ring element 1 runs through his plant on the diaphragm spring 2 with this around. The relative movement between the sliding sleeve, which is fixed in the circumferential direction 3 and the circumferential first ring element 1 is balanced by the interposition of the sliding element 5. Through the low coefficient of friction of the sliding element 5 and, for example, by an additionally applied hard layer on the boundary surface 6 of the first ring element 1 ensures that the sliding movements occurring on the boundary surfaces 6 during do not lead to excessive wear during the normal service life of the slide bearing release. It should also be noted that the Housing 9 provides practically no functional contribution and only serves to hold the entire release mechanism together,

Fig. 2 shows a similar slide bearing releaser. Here is the sliding sleeve 3 is also mounted on a tube 7 so as to be axially displaceable. The second ring element is fixed to the sliding sleeve 3 4 connected. This ring element 4 carries the sliding element 5 in fixed mutual connection.-The first ring element 1 is opposite the sliding element 5 rotatably mounted and both parts together form a radially extending boundary surface 6 Ring element 1 has on its side facing the diaphragm spring 2 projections 8, which into the spaces between the individual spring tongue ends of the diaphragm spring 2 and thus establish both a non-rotatable connection and a radial fixation. The housing 9 encompasses both the ring element and the sliding element 5 at their outer diameters and connects both parts to one another in a rotationally fixed manner. At the same time, it holds the otherwise loose ring element 1, at least during manufacture and fixed during assembly.

The functionality of this slide bearing release is essentially the same 1. The only difference is that here the sliding element 5 made of plastic with very good sliding properties and this plastic ring is firmly attached to the ring element 4 is connected.

05/14/1979

Tip-2 Ho / whm- 030Ö5Q / © S6t

e e r s e

Claims (1)

PATENT CLAIMS / l. Plain bearing release j preferably for clutches of motor vehicles with internal combustion engine, dad. gek. that between the with the release parts of the clutch (diaphragm spring 2) revolving first ring element (1) and the one on an equipment fork or a Sliding sleeve (3) axially displaceable but non-rotatably arranged second ring element (4) a sliding element (5) is. 2. plain bearing releaser according to claim 1, dad. gek. that the sliding element (5) consists of ceramic or similar, with a low coefficient of friction and a hard consistency, 3. plain bearing releaser according to claim 1, dad, gek. That the sliding element (5) is made of plastic and has very good sliding properties. 4. plain bearing releaser according to claims 1 to .3, dad. approved, that the sliding element (5) is loosely arranged between the first ring element (1) and the second ring element (4). 5. plain bearing releaser according to claims 1 to 4, dad. approved, that the axial boundary surfaces (6) of the sliding element (5) run essentially radially and the sliding element (5) is provided with radial play. 6. plain bearing releaser according to claims 1 to 3, dad. gel, that the sliding element (5) is rotatably arranged. 7. plain bearing releaser according to claims 1 to 6, dad. approved, that the first ring element (1) is provided with a hard layer at least on the contact surface (6) towards the sliding element (5) is, 8. Plain bearing releaser according to claims 1 to 7, dad, gek. That the first ring element (1) via projections (8) which in the Intervene gaps between the release elements (diaphragm spring 2), non-rotatably connected to the clutch and fixed ^isfc '030050 / Ό561 May 14, 1979 - TIP-2 Ho / whm- ORIGINAL INSPECTED