WO2011067082A1

WO2011067082A1 - Guide assembly, in particular for a clutch actuation unit

Info

Publication number: WO2011067082A1
Application number: PCT/EP2010/067166
Authority: WO
Inventors: Helmut Schillinger; Jürgen WINDRICH; Ludwig Winkelmann
Original assignee: Schaeffler Technologies Gmbh & Co. Kg
Priority date: 2009-12-02
Filing date: 2010-11-10
Publication date: 2011-06-09
Also published as: DE112010004650A5; DE102009056614A1

Abstract

The invention relates to a guide assembly forming a component of a so-called clutch actuation unit, in particular in the field of automobile construction. According to the invention, a glide function surface is formed by applying a PEEK film loaded with glide function additives to a carrier structure.

Description

Name of the invention

Guide arrangement, in particular for a

Clutch actuator

description

FIELD OF THE INVENTION The invention relates to a guide arrangement as it forms part of so-called clutch actuators, in particular in the field of automobile construction.

Gear arrangements are known in which the guidance of clutch actuators, in particular sliding sleeves or ring pistons, is accomplished by guide tubes which are located in the region of a gear bell and are formed in one piece with a housing typically made of cast aluminum. Already at average mileages considerable wear on those guide tubes can be detected in such geared constructions. This formation of wear is only partially reduced by the addition of lubricant. The initially improved running properties are worsened by prolonged operation due to accumulation of dirt particles in the lubricant. In the course of advanced wear of the guide sleeve, there is a considerable increase in the required actuating forces. The repair of such worn guide sleeves proves to be costly in addition to the time-consuming expansion of the transmission, also in view of the difficulties in the renewal of the guide tubes.

From DE 100 64 459 A1 a dual-clutch transmission is known, the two clutches are each actuated by an annular piston. The two annular pistons are provided with seals and guided in each case axially displaceable on bushes. Those bushings are made relatively thin-walled and arranged coaxially with a gear shaft. Object of the invention

The object of the invention is to provide solutions by means of which it is possible to achieve an improvement in the functional properties of movably coupled, for example, axially guided components, in particular coupling systems, in a manner which can be accomplished relatively inexpensively from a manufacturing point of view. Inventive solution

This object is achieved according to a first aspect of the present invention according to the invention by a guide arrangement with a first cylinder element which forms a cylinder outer surface, and a gripping element, which surrounds the cylinder element as such, wherein the cylinder element and the gripping element are guided relative to each other via a Gleitflächenpaarung relatively displaceable, wherein this guide arrangement is characterized in that a guiding surface of the two components to each other causing sliding surface is formed by a plastic material layer which is provided by shrinkage of a hose or film portion on the cylinder member.

The invention is particularly suitable for release systems for clutch actuation in automotive manual transmissions. Furthermore, the invention is also suitable for coating of leading, or guided pins or pistons, in particular for the coating of so-called. Kupplungsgeber- and / or slave cylinder bushings and pistons.

The invention is also suitable for use in linear guides, such as shafts, guide tubes, rails and tappets. The inventive concept makes it possible in a particularly advantageous manner to realize a reliable guide mechanism, especially with a small amount of space available. The wall thickness of the present invention The sheath is preferably in the range of 0.8 mm. The jacket provided for forming the sheath according to the invention is preferably made of PEEK, which is loaded with dry-lubricating fillers. It is possible to provide the supporting substructure according to the invention with a jacket attached under shrinkage with a profiling, for example in the form of spaced-apart grooves. This profiling can be designed so that certain zones of the shell dive under the actual tread. This makes it possible to ensure a cohesion of the shell, even if this is partially worn, especially locally worn away.

The invention also comprises further measures contributing to a reduction in wear for further moving surface systems of coupling mechanisms. In particular, the invention proposes a partial coating on the disengagement module, by means of which tolerance-related inaccuracies of, for example, up to approximately 0.4 mm can be compensated and thus a large wear reserve is created. The tube section can advantageously be anchored to the cylinder element by means of an adhesive agent layer. It is also possible to manufacture the tube section from a multi-layer material which comprises, for example, a melt-weldable inner layer. About this inner layer of the hose section can be welded in the context of shrinkage of the same on the substructure.

According to a particularly preferred embodiment of the invention, the hose section is formed of a PEEK base material. According to a particular aspect of the present invention, this hose section is preferably loaded with wear-reducing fillers, in particular PTFE, MoS 2 or Cerflon. It is possible to carry out the film material provided for forming the tube section as a multilayer material, or otherwise inhomogeneous structure over its thickness. Thus, it is possible to design the outside area, in particular about one third of the layer thickness, to have particularly advantageous guiding properties, the middle, ie the second third, with a certain weighting of the residual function time, and the inner third to the residual content of the shell, for extreme load cycle numbers. This can be achieved by forming the innermost region of the jacket from a high-strength material, preferably a material connection to the sub-structure. The middle part is formed from a relatively wear-resistant plastic material with fiber filling, the outer region of the sheath according to the invention consists of a plastic with a high proportion of lubricating additives. The jacket material according to the invention is preferably designed such that the shrinkage stress is essentially built up by the lower area, ie, the area exposed to very late potential wear effects. As a result, it is achieved that even with an advanced degree of wear of the sliding surface, the sheath according to the invention is still reliably clamped onto the substructure.

The tube section can be provided with a microperforation which allows an exit of the air possibly trapped by the tube section and thus prevents the formation of air pockets. The shrunk-on jacket can be recalibrated in an advantageous manner, whereby, for example, fusion welding material can be locally displaced during this recalibration and thus a particularly high dimensional accuracy of the outer surface of the coating formed in accordance with the invention is achieved. The component, which is initially referred to as a cylinder element and coated in accordance with the invention, can be designed in accordance with special aspect of the present invention act as a piston of a clutch master cylinder. Farther The cylinder element encased according to the invention can also function as a guide bushing of a coupling system.

Especially for the field of transmission technology, the object stated at the outset is also achieved by a clutch actuation mechanism having a movement surface system which is formed by two relatively movable and kinematically coupled components, this moving surface system comprising a movement surface which is formed by a PEEK plastic layer, wherein this plastic layer is bonded to one of the aforementioned components.

This connection can be accomplished advantageously by a melting or vulcanization process. The correspondingly meltable material can be embodied as a prepared layer of a film starting material according to the invention. Alternatively to the aforementioned measure, the connection of the guide lining according to the invention can also be accomplished by an adhesive agent.

The invention is suitable in a particularly advantageous manner for the realization of a compensation mechanism of a clutch actuation bearing. In this case, the moving surface coated according to the invention forms, for example, a dome ring surface of a thrust ring angled joint.

The concept according to the invention is also suitable for realizing a sliding surface pairing in a coupling claw.

The coating according to the invention can also be used for kinematic coupling of components which perform no pronounced relative movements against each other, however, to avoid static Überbestimmun- conditions, or pending while avoiding a transverse force transmission slidably together. The coating according to the invention is designed in this respect in particular in the region of an annular end face for the introduction of axial force into a sliding sleeve. Brief description of the figures

Further details and features of the invention will become apparent from the following description in conjunction with the drawings. It shows:

Figure 1 is a sectional view illustrating the use of a guide assembly according to the invention as part of a clutch actuation device;

FIG. 2 shows a sectional illustration for illustrating the use of a guide arrangement according to the invention as part of a clutch master cylinder system (hydraulic clutch encoder mechanism); Figure 3 is a detail sectional view illustrating the use of a guide assembly according to the invention in a coaxial with a transmission input shaft arranged annular piston clutch actuator (hydraulic clutch slave mechanism); FIGS. 4a, 4b

two sectional views to further illustrate the use of a guide assembly according to the invention in the region of the power transmission zone between a clutch release lever and a sliding sleeve, as well as in the power flow subsequent joint systems.

Detailed description of the figures

FIG. 1 illustrates the structure of a clutch system which as such serves to selectively couple the input shaft 1 of a transmission to an internal combustion engine. The clutch system comprises a Kupplungsreibbelag 2 which is rotatably coupled via a toothing 3 with the transmission input shaft 1. Furthermore, the clutch system comprises a pressure plate 4 via which the Kupplungsreibbelag 2 against an engine flywheel. 5 is tensionable. The actuation of the pressure plate 4 is carried out in a conventional manner via a follower spring plate 6. This spring plate 6 in turn is actuated via a release bearing 7 which is mounted on a sliding sleeve 8 and axially displaceable together with the sliding sleeve 8.

The coupling system shown here is characterized in that that sliding sleeve 8 is guided on a coaxial with the transmission shaft 1 guide pin 9, wherein on these guide pin 9, a sliding coating 10 is applied by shrinkage of a shell body, said shell body of a PEEK material is manufactured in which Gleitfunktionsfüllstoffe are embedded.

The aforementioned sliding coating 10 is formed by a heat-shrinkable tube, which is mounted on the guide pin 9 and shrunk under heat supply. The guide pin 9 and the material of the shrink tube are dimensioned such that the sliding sleeve 8 is seated on the guide pin 9 under as close a movement as possible.

Advantages:

· Simple, inexpensive coating method

Highly wear-resistant coating

No greasing of the guide track area required because the PEEK coating together with the sliding sleeve z. For example, glassfase-reinforced plastic with dry lubrication works very well;

· Elimination of grease lubrication largely prevents clogging of the dirt on the guide track

Reduction of noise

During the manufacture of the shrink tube, particles which reduce wear in the corresponding material, for. B. in the form of PTFE, MoS2, Cerflon o. Ä. Incorporated.

Advantages: Low-friction coating with coefficient of friction of about 0.1 and thus increasing the overall efficiency of the release device

Reduced heat generation during operation

Reduced wear

FIG. 2 shows a clutch-generating device manufactured on the basis of the concept according to the invention. This coupling device comprises a base housing 18, a cylinder 1 1 inserted into the base housing 18 and a master piston 12 axially displaceably guided in the cylinder 11. Fluid is displaced from the cylinder 1 by axial displacement of that master piston 12 within the cylinder 11 1 out, or sucked into the interior of the cylinder 1 1. The introduction of corresponding axial forces in the master piston 12 via a push rod 13 which is typically hinged via a pivot pin to a Kupplungspedalarm. The push rod 13 is supported via a ball joint 14 in the master piston 12.

The coupling device shown here is characterized in that the master piston 12 is provided with a sheath 15 which is formed from a plastic shrink tubing. The sheathing 15 is preferably also connected to the basic body of the master piston 12 materially, in particular by an adhesive agent or a fusion welding agent. The plastic material intended to form the casing 15 is loaded with lubricating additives.

The sheath 15 is designed such that it also covers the inner end wall 12a by means of a front face wall portion 15a. In a particularly advantageous manner, a particularly advantageous guidance of the master piston 12, as well as a particularly effective protection of the seals 16, 17 achieved by inventively created seal runways and corrosion protection of the master piston body by this concept. The sheath 15 may be formed such that it covers the outer end face 12 b of the clutch master piston 12, as indicated here. The sheath 15 has for this purpose a front portion 15b. The transition region between the cylinder wall and the end wall is preferably made rounded. On the master piston 12 profilings, in particular circumferential grooves may be formed, through which a positive axial locking of the sheath is achieved. The sheathing 15 can be designed such that it extends into the region of the ball joint 14 and also forms a sliding function covering for the ball joint 14. The ball joint shown here can be sealed by a sealing device not shown here, in particular a small elastomeric bellows sleeve or sealed off from the environment.

By shrinking a hose section onto the ball joint area of the push rod 13, it is also possible to provide a sliding functional surface according to the invention there.

Advantages:

Reduction of squeaking noise in systems with brake fluid (brake fluid has very little lubricating effect)

Reduction of wear and thus increase the service life

Reduction Reduction of friction and thus increase of overall efficiency

· No distortion and dimensional change due to the heat treatment such. B. nitrocarburizing or case hardening.

FIG. 3 shows the use of a guide arrangement according to the invention in a slave cylinder system which is also referred to as a CSC actuator.

That slave cylinder system comprises an annular piston body 12 which is guided in an axially displaceable manner in an annular space, wherein that annular space is defined by an annular piston body 12. NEN outer cylinder ring 1 10 and a guide sleeve 1 13 is formed. The guide sleeve 1 13 is provided with a casing 1 15, which is made by shrinking a hose section made of PEEK. In this exemplary embodiment too, the sheathing 11 is preferably connected to the main body of the guide sleeve 13 with the addition of an adhesive agent or a welding material layer.

The casing according to the invention forms a guide surface for the axial guidance of the annular piston 1 12 and a particularly advantageous running surface for the end face arranged piston seal 1 17th

FIGS. 4a and 4b show further embodiments of a guide device according to the invention. According to the wear-prone areas on the release module is partially coated with a film of PEEK in the hot stamping process. The punched out as a molded parts from a film web sections are placed on the appropriate wear prone areas 241, 242, 243, 244, 245 and connected to a hot stamp with äquisestanter contour to the wear area under contact pressure with the metal element.

Advantages:

Partial coating possible and saves coating material and energy

According to the requirement, different layer thicknesses z. b. be generated on the release lever.

Even with spherically curved surfaces such. B. on the adjusting ring or the mating contour on the raceway a high dimensional accuracy is generated by the tool-bound coating. At the same component to be coated such. B. adjustment different coatings can be provided with different formulations, adapted to the particular stress. Thus, for the contact region 245 of the clutch actuator spring tongues 246 with the adjusting ring 247 a PEEK coating with high abrasion resistance with z. B. flat lying oriented carbon fibers proposed. In contrast, the spherical curved contact region 244 between the adjusting ring 247 and the race 248 is designed in particular with friction-reducing additives.

LIST OF REFERENCE NUMBERS

1 input shaft

2 clutch friction lining

3 toothing

4 pressure plate

5 engine flywheel

6 spring plate

7 release bearing

8 sliding sleeve

9 guide pins

10 sliding coating

1 1 cylinder

12 master piston

2a end wall

12b front end

13 push rod

18 basic housing

14 ball joint

15 sheathing

15a face coat section

15b forehead section

15a face coat section

16 seal

17 seal

1 12 piston body

1 13 guide sleeve

1 15 sheathing

1 17 piston seal

241 Wear-prone area

242 Wear-prone area

243 Wear-prone area Wear-prone area Wear-prone area Clutch actuator spring tongues Adjustment ring

race

Claims

claims

1 . Leadership arrangement with:

- A first cylinder element which forms a cylinder outer surface, and

a wraparound element which as such surrounds the cylinder element,

- Wherein the cylinder element and the Umgriffselement are guided relative to each other via a pair of sliding surfaces relatively displaceable,

- characterized in that at least one, the guidance of the two components to each other causing, sliding surface of that Gleitflächenpaarung, is formed by a plastic material layer, which is applied by shrinkage of a hose or film portion on the cylinder element.

2. Guide arrangement according to claim 1, characterized in that the hose section is formed of a PEEK base material.

3. Guide arrangement according to claim 2, characterized in that the hose section is loaded with wear-reducing fillers, in particular PTFE, MoS2, Cerflon.

4. guide arrangement according to at least one of claims 1 to 3, characterized in that the tube section by means of an adhesive layer is anchored to the cylinder element.

5. Guide arrangement according to at least one of claims 1 to 4, characterized in that the cylinder element acts as a piston (12) of a clutch master cylinder.

6. Guide arrangement according to at least one of claims 1 to 4, character- ized in that the cylinder element acts as a guide pin (9) of a coupling system.

7. clutch actuation mechanism having a movement surface system which is formed by two mutually relatively movable and kinematically coupled components, said moving surface system comprises a sliding surface which is formed by a PEEK plastic layer, said plastic layer is connected to one of the aforementioned components.

8. clutch actuating mechanism according to claim 7, characterized in that the connection is accomplished by a melting process.

9. clutch actuating mechanism according to claim 7, characterized in that the connection is accomplished by an adhesive agent.

10. clutch actuating mechanism according to at least one of claims 7 to 9, characterized in that the sliding surface is a Kalottenringfläche a Druckringangleichgelenks.

1 1. Clutch actuation mechanism according to at least one of claims 7 to 9, characterized in that the moving surface is a moving surface on a coupling claw.

12. clutch actuating mechanism according to at least one of claims 7 to 9, characterized in that the moving surface is an annular end face for the introduction of axial force into a sliding sleeve.