DE102009056614A1 - Guide arrangement, in particular for a clutch actuator - Google Patents

Abstract

The invention relates to a guide arrangement as it forms, in particular in the field of automotive engineering, part of so-called. Clutch actuation devices. According to the invention, a sliding functional surface is formed by applying a PEEK film loaded with lubricating functional additives to a carrier structure.

Description

Field of the invention

The invention relates to a guide arrangement as it forms, in particular in the field of automotive engineering, part of so-called. Clutch actuation devices.

There are known transmission constructions in which the leadership of Kupplungsbetätigungsorganen, in particular sliding sleeves or annular piston is accomplished by guide tubes, which are located in the region of a bell housing and are integrally formed with a typically made of cast aluminum housing. Already at average mileages significant wear on those guide tubes is detected in such transmission designs. 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 significant 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.

Out DE 100 64 459 A1 is a dual-clutch transmission 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 invention has for its object to provide solutions by which it is possible to achieve in a relatively low-manufacturing aspects from a technical point of view, an improvement in the functional properties of movably coupled, for example, axially guided components, in particular coupling systems.

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 sheath realized according to the invention 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 be anchored to the cylinder element in an advantageous manner 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. This hose section, according to a particular aspect of the present invention, is preferably loaded with wear reducing fillers, in particular PTFE, MoS2 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 outer area, in particular about one third of the layer thickness to particularly advantageous guiding properties, the middle, d. H. the second third with a certain weighting of the remaining working time, and the inner third to the Resterhalt of the coat to interpret at extreme load cycles. This can be achieved by forming the innermost region of the jacket from a high-strength material, preferably a material connection with 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 sheath material according to the invention is preferably designed so that the shrinkage stress is essentially determined by the lower, d. H. only very late potential wear effects exposed area is built up. This ensures that even with advanced wear of the sliding surface of the casing according to the invention is still reliably clamped on 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, wherein in the context of this recalibration z. B. fusion welding material can be displaced locally and thus a particularly high dimensional accuracy of the outer surface of the coating formed according to the invention is achieved.

The element initially referred to as a cylinder element, according to the invention sheathed component can act according to a particular aspect of the present invention as a piston of a clutch master cylinder. Furthermore, the cylinder element encased according to the invention can also function as a guide bushing of a coupling system.

Especially for the field of gear technology, the object mentioned above is also achieved by a clutch actuation mechanism with a movement surface system which is formed by two mutually relatively movable and kinematically coupled components, said moving surface system comprises a movement surface which is formed by a PEEK plastic layer, said Plastic layer is connected to one of the aforementioned components.

This connection can be accomplished advantageously by a melting or vulcanization process. The correspondingly meltable material can be designed 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 pressure ring adjoining joint.

The inventive concept is also suitable for the realization of a sliding surface pairing in a coupling claw.

The coating according to the invention can also be used for the kinematic coupling of components which perform no pronounced relative movements against each other, however, to avoid static over-determination, 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 taken in conjunction with the drawings. It shows:

1 a sectional view for illustrating the use of a guide assembly according to the invention as part of a clutch actuator;

2 a sectional view illustrating the use of a guide assembly according to the invention as part of a clutch master cylinder system (hydraulic clutch encoder mechanism);

3 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);

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

1 illustrates the structure of a coupling system as such, the selective coupling of the input shaft 1 a transmission with an internal combustion engine is used. The coupling system comprises a clutch friction lining 2 the over a gearing 3 rotatably with the transmission input shaft 1 is coupled. Furthermore, the coupling system comprises a pressure plate 4 over which the clutch friction pad 2 against an engine flywheel 5 is tensionable. The actuation of the pressure plate 4 takes place in a conventional manner via a follower spring plate 6 , This spring plate 6 in turn will have a release bearing 7 presses this on a sliding sleeve 8th attached and together with the sliding sleeve 8th is axially displaceable.

The coupling system shown here is characterized in that that sliding sleeve 8th on a coaxial to the gear shaft 1 arranged guide pin 9 is guided, wherein on those guide pin 9 a sliding coating 10 is applied by shrinkage of a sheath body, said sheath body is made of a PEEK material in which Gleitfunktionsfüllstoffe are embedded.

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

Advantages:

• • Simple, cost-effective coating method
• • Highly wear-resistant coating
• • No greasing of the guide raceway area is necessary because the PEEK coating together with the sliding sleeve z. B. made of glass fiber reinforced plastic with dry lubrication works very well;
• • Elimination of grease lubrication largely prevents clogging of the contamination on the guide track
• • Reduction of noise

In the manufacture of the shrink tube wear-reducing particles z. B. in the form of PTFE, MoS2, Cerflon o. Ä. Incorporated.

Advantages:

• • Low-friction coating with coefficients of friction of about 0.1, thereby increasing the overall efficiency of the disengaging device
• • Reduced heat development during operation
• • Reduced wear

In 2 is a manufactured on the basis of the concept of the invention coupling device shown. This coupling device comprises a basic housing 18 , one in the basic housing 18 used cylinder 11 and one in the cylinder 11 axially displaceable guided master piston 12 , By axial displacement of that master piston 12 inside the cylinder 11 Fluid gets out of the cylinder 11 out, or inside the cylinder 11 sucked. The introduction of appropriate axial forces in the master piston 12 via a push rod 13 which is typically hinged to a clutch pedal arm via a pivot pin. The push rod 13 is supported by a ball joint 14 in the master piston 12 from.

The coupling device shown here is characterized in that the master piston 12 with a sheath 15 is provided, which is formed of a plastic shrink tubing. The jacket 15 is preferably with the basic body of the master piston 12 also material, in particular connected by an adhesive or a fusion welding agent. The formation of the sheath 15 envisaged plastic material is freighted with lubricating additives.

The jacket 15 is formed such that it also the inner end wall 12a by means of a front face section 15a covers. In a particularly advantageous manner, this concept provides 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 raceways and corrosion protection of the master piston body.

The jacket 15 can be designed such that this as indicated here also the outer front end 12b of the clutch master piston 12 covers. The jacket 15 has for this purpose a frontal section 15b on. The transition region between the cylinder wall and the end wall is preferably made rounded. At the master piston 12 Profiles, in particular circumferential grooves may be formed, through which a positive axial locking of the sheath is achieved. The jacket 15 can be designed so that they extend into the area of the ball joint 14 extends and also for the ball joint 14 forms a Gleitfunktionsbelag. 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.

It is possible by shrinking a hose section on the ball joint area of the push rod 13 also there to provide a Gleitfunktionsfläche invention.

Advantages:

• • Reduction of squeaking noises when using brake fluid operated systems (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 changes due to the heat treatment, such as B. nitrocarburizing or case hardening.

In 3 the use of a guide arrangement according to the invention is illustrated in a slave cylinder system, also referred to as a CSC actuator.

That slave cylinder system includes an annular piston body 112 which is guided axially displaceably in an annular space, wherein said annular space by an outer cylindrical ring 110 and a guide sleeve 113 is formed. The guide sleeve 113 is with a sheath 115 which is made by shrinking a PEEK hose section. Also in this embodiment, the sheath 115 preferably with the addition of an adhesive agent, or a welding material layer with the main body of the guide sleeve 113 connected.

The casing according to the invention forms a guide surface for the axial guidance of the annular piston 112 and a particularly advantageous running surface for the end face arranged piston seal 117 ,

In the 4a and 4b Further embodiments of a guide device according to the invention are shown. 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 of a film web sections are on the appropriate wear-prone areas 241 . 242 . 243 . 244 . 245 applied and connected to the metal element with a hot stamp with an appealing contour to the wear area under contact pressure.

Advantages:

• • Partial coating possible and saves coating material and energy
• • According to the requirement, different layer thicknesses, eg. 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. So will for the contact area 245 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. The spherical curved contact area 244 between adjustment ring 247 and raceway 248 In contrast, it is especially designed with friction-reducing additives.

LIST OF REFERENCE NUMBERS

1

input shaft

2

Kupplungsreibbelag

3

gearing

4

printing plate

5

Flywheel

6

spring plate

7

release bearing

8th

sliding sleeve

9

spigot

10

sliding lining

11

cylinder

12

master piston

12a

end wall

12b

front end

13

pushrod

18

Headers

14

ball joint

15

jacket

15a

Front jacket section

15b

front section

15a

Front jacket section

16

poetry

17

poetry

112

Ring piston body

113

guide sleeve

115

jacket

117

piston seal

241

Wear-prone area

242

Wear-prone area

243

Wear-prone area

244

Wear-prone area

245

Wear-prone area

246

Clutch diaphragm spring fingers

247

Adjusting ring

248

race

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 10064459 A1 [0003]

Claims (12)

Guide arrangement with: - a first cylinder element which forms a cylinder outer surface, and - a Umgriffselement as such surrounds the cylinder element, - wherein the cylinder element and the Umgriffselement are guided relative to each other via a Gleitflächenpaarung relatively displaceable, - characterized in that at least one, the leadership of two components to each other causing, sliding surface of those Gleitflächenpaarung, is formed by a plastic material layer, which is applied by shrinkage of a hose or film section on the cylinder element. Guide arrangement according to claim 1, characterized in that the hose section is formed of a PEEK base material. Guide arrangement according to claim 2, characterized in that the hose section is loaded with wear-reducing fillers, in particular PTFE, MoS2, Cerflon. Guide arrangement according to at least one of claims 1 to 3, characterized in that the tube section is anchored by means of an adhesive layer on the cylinder element. Guide arrangement according to at least one of claims 1 to 4, characterized in that the cylinder element as a piston ( 12 ) of a clutch master cylinder acts. Guide arrangement according to at least one of claims 1 to 4, characterized in that the cylinder element as a guide pin ( 9 ) of a coupling system. 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 bonded to one of the aforementioned components. Clutch actuation mechanism according to claim 7, characterized in that the connection is accomplished by a melting process. Clutch actuation mechanism according to claim 7, characterized in that the connection is accomplished by an adhesive agent. Clutch actuation mechanism according to at least one of claims 7 to 9, characterized in that the sliding surface is a Kalottenringfläche a Druckringangleichgelenks. 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. Clutch actuation mechanism according to at least one of claims 7 to 9, characterized in that the moving surface is an annular end face for axial force introduction into a sliding sleeve.

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