JP2014114893A - Clutch release bearing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure that facilitates designing such that a first bearing unit 14 including a first clutch release bearing 19 and a second bearing unit 15 including a second clutch release bearing 32 do not interfere with each other within respective operation ranges.SOLUTION: The first and second bearing units 14, 15 are distributed onto the inner diameter side and the outer diameter side of a guide cylindrical part 16. Concretely, the first bearing unit 14 is internally fitted to the guide cylindrical part 16 so as to be movable in an axial direction, and the second bearing unit 15 is externally fitted to the guide cylindrical part 16 so as to be movable in the axial direction.

Description

  The present invention relates to an improvement of a clutch release bearing device used by being incorporated in a dual clutch transmission (hereinafter referred to as DCT) which is a kind of transmission for vehicles such as automobiles and motorcycles.

  In the dry type DCT, the set of clutch and gear is divided into two systems of an odd number and an even number, and the clutches of these two systems are alternately connected to enable quick and smooth shifting operation. . FIG. 3 shows an example of a conventional structure of a clutch release bearing device incorporated in such a dry DCT and used for switching between connection and disconnection of both clutches. Is shown.

  The clutch release bearing device includes a front cover 1 and first and second bearing units 2 and 3. Of these, the front cover 1 includes a guide cylindrical portion 4 that is a guide shaft and is a cylindrical hollow shaft. The first bearing unit 2 includes a first bearing holder 5 that is externally supported so as to be axially movable with respect to the guide cylindrical portion 4, and a front end portion (front and rear) of the first bearing holder 5. Regarding the direction, the first clutch release bearing 6 having a relatively small diameter is supported on the left side in FIG. 3 as “front side” and the right side as “rear side”. With. A pressing portion 8 is provided at the front end portion of the inner ring 7 which is the first rotating wheel constituting the first clutch release bearing 6 to press the center portion of the first diaphragm spring described later in the axial direction. Further, the second bearing unit 3 is a second bearing that is externally supported so as to be movable in the axial direction with respect to the guide cylindrical portion 4 via an intermediate portion or a rear end portion of the first bearing holder 5. A holding body 9 and a second clutch release bearing 10 having a relatively large diameter supported by the upper front side portion of the second bearing holding body 9 so as to be slightly displaceable in the radial direction are provided. A pressing portion 12 for pressing the central portion of the second diaphragm spring described below in the axial direction is provided at the front end portion of the inner ring 11 which is the second rotating wheel constituting the second clutch release bearing 10. .

  When the above-described clutch release bearing device is assembled to the DCT, the guide cylindrical portions 4 constituting the front cover 1 are connected to the engine flywheel concentrically with each other. The rear end portion of the front cover 1 is coupled and fixed to a clutch case (not shown) while being arranged in the axial direction of the second diaphragm spring. Further, in this state, the first bearing unit 2 is placed between the central portion of the first diaphragm spring and the tip of a first release fork (not shown) that is swingably assembled on the vehicle body side in the axial direction. To place. At the same time, the second bearing unit 3 is arranged between the central portion of the second diaphragm spring and the tip of a second release fork (not shown) that is swingably assembled to the vehicle body side in the axial direction. .

  In this state, when the rear end surface of the first bearing holder 5 is pressed by the front end portion of the first release fork during operation of the vehicle, the first bearing unit 2 is moved to the outer peripheral surface of the guide cylindrical portion 4. And the pressing portion 8 presses the central portion of the first diaphragm spring in the axial direction. As a result, based on the operation of a known mechanism, the connection of one of the two systems of clutches constituting the DCT is disconnected. On the other hand, when the rear end surface of the second bearing holder 9 is pressed by the tip of the second release fork, the second bearing unit 3 is moved along the outer peripheral surface of the first bearing holder 5. Moving to the front side, the pressing portion 12 presses the central portion of the second diaphragm spring in the axial direction. As a result, based on the operation of a known mechanism, the other clutch of the two systems of clutches is disconnected.

  When the pressing portion 8 presses the central portion of the first diaphragm spring, if there is an eccentricity between the first clutch release bearing 6 and the first diaphragm spring, the first When the clutch release bearing 6 is displaced in the radial direction with respect to the first bearing holder 5, the eccentricity is eliminated. Similarly, when an eccentricity is generated between the second clutch release bearing 10 and the second diaphragm spring when the pressing portion 12 presses the central portion of the second diaphragm spring, The eccentricity is eliminated by the two-clutch release bearing 10 being displaced in the radial direction with respect to the second bearing holder 9. Further, in a state where the pressing portion 8 is pressing the central portion of the first diaphragm spring, the inner ring 7 of the first clutch release bearing 6 rotates together with the first diaphragm spring, whereby the first diaphragm spring. And the first release fork are allowed to rotate relative to each other. Similarly, in a state in which the pressing portion 12 presses the center portion of the second diaphragm spring, the inner ring 11 of the second clutch release bearing 10 rotates together with the second diaphragm spring, so that the first Relative rotation between the two diaphragm springs and the second release fork is allowed.

By the way, in the DCT, since the speed change operation is performed while the two clutches are alternately connected, the axial movement of the first and second bearing units 2 and 3 may interfere with each other in the respective operation ranges. There is no need to be able to do it freely. That is, it is necessary to employ a configuration in which the first and second bearing units 2 and 3 do not interfere with each other in their respective operating ranges. On the other hand, in the case of the conventional structure described above, the first and second both bearing units 2 and 3 are both arranged on the outer diameter side of the guide cylindrical portion 4. For this reason, there are many structural restrictions to prevent the first and second bearing units 2 and 3 from interfering with each other in the respective operation ranges, and the degree of design freedom is reduced accordingly. However, there is a problem that it becomes easy to enlarge.
Patent Documents 2 and 3 also describe a clutch release bearing device that can be used by being incorporated in a dry DCT. In these cases, both of the pair of bearing units are on the outer diameter side of the guide cylindrical portion. Therefore, the same problem as that of the conventional structure described above is caused.

JP 2010-156402 A JP 2010-156403 A JP 2010-164079 A

  In view of the circumstances as described above, the present invention can be easily designed to prevent a pair of bearing units from interfering with each other in their respective operation ranges, and is intended to realize a structure that can be easily reduced in size and weight. It is a thing.

The clutch release bearing device of the present invention includes a guide shaft, a first bearing unit, and a second bearing unit.
Of these, the guide shafts are disposed in the axial direction of the first and second diaphragm springs that are concentrically arranged to constitute the clutch device.
The first bearing unit is supported so as to be movable in the axial direction with respect to the guide shaft, and is supported so as to be displaceable in the radial direction with respect to the first bearing holder. A first clutch release bearing. Among these, the first clutch release bearing includes a first rotating wheel that rotates together with the first diaphragm spring while pressing the central portion of the first diaphragm spring in the axial direction at least during a speed change operation.
The second bearing unit is supported so as to be movable in the axial direction with respect to the guide shaft, and supported so as to be displaceable in the radial direction with respect to the second bearing holder. A second clutch release bearing. Of these, the second clutch release bearing includes a second rotating wheel that rotates together with the second diaphragm spring while pressing the central portion of the second diaphragm spring in the axial direction at least during a speed change operation.
In particular, in the clutch release bearing device of the present invention, the guide shaft is a cylindrical hollow shaft. The first bearing holder is fitted on the inner peripheral surface of the guide shaft so as to be movable in the axial direction. The second bearing holder is fitted on the outer peripheral surface of the guide shaft so as to be movable in the axial direction.

  Further, in the case of implementing the present invention, when using a release fork as means for pressing the first bearing unit in the axial direction toward the first diaphragm spring in use, preferably, it is described in claim 2. As in the invention described above, an insertion hole into which the release fork can be inserted is provided in a part of the hollow cylindrical shaft that is the guide shaft.

In the case of the clutch release bearing device of the present invention configured as described above, a configuration is adopted in which the first bearing unit and the second bearing unit are arranged separately on the inner diameter side and the outer diameter side of the guide shaft. Yes. For this reason, there is substantially no structural restriction to prevent the first and second bearing units from interfering with each other in the respective operation ranges, and the degree of design freedom can be increased accordingly. . And it becomes easy to achieve size reduction and weight reduction.
According to the second aspect of the present invention, it is possible to easily realize a configuration in which a release fork is used as a means for pressing the first bearing unit in the axial direction toward the first diaphragm spring.

The half part sectional view showing an example of an embodiment of the invention. The figure which took out only the front cover and was seen from the upper part of FIG. Sectional drawing which shows an example of a conventional structure.

1 and 2 show an example of an embodiment of the present invention. The clutch release bearing device of this example includes a front cover 13 and first and second bearing units 14 and 15.
Of these, the front cover 13 is a guide shaft and is a cylindrical hollow shaft, and a guide cylindrical portion 16 and a rear end edge of the guide cylindrical portion 16 (the front left side in FIGS. Is the “rear side”, and the right side is the “rear side.” In the case of an FR vehicle, it matches the longitudinal direction of the vehicle body, but in the case of an FF vehicle, an RR vehicle, etc. Does not necessarily match.) And a flange portion 17 provided in a state of being bent radially outward. Of these, a pair of insertion holes 44, 44 that are each long in the axial direction are provided in parallel to each other at intervals in the circumferential direction at the rear end of the guide cylindrical portion 16 in the axial direction.

The entire first bearing unit 14 is disposed on the inner diameter side of the guide cylindrical portion 16. Such a first bearing unit 14 includes a first bearing holder 18 that is fitted and supported so as to be movable in the axial direction with respect to the guide cylindrical portion 16, and a radial direction with respect to the first bearing holder 18. And a relatively small-diameter first clutch release bearing 19 that is supported so as to be slightly displaceable.
Of these, the first clutch release bearing 19 is formed at a position where the inner ring 20 that is a stationary ring, the outer ring 21 that is a first rotating ring, and the outer peripheral surface of the inner ring 20 and the inner peripheral surface of the outer ring 21 face each other. And a plurality of balls 22 provided between the pair of raceway surfaces so as to be freely rollable. Further, the front end portion of the outer ring 21 protrudes in the axial direction from the front end portion of the inner ring 20, and the front end edge of the outer ring 21 is folded back toward the inner diameter side to press the central portion of the first diaphragm spring described later in the axial direction. It is set as the press part 23 for doing.

The first bearing holder 18 is formed by combining a first resin molded body 24, a first anvil 25, a first connecting member 26, and a first aligning spring 27 with each other.
Of these, the first resin molded body 24 is made of a synthetic resin having sufficient strength, rigidity, heat resistance, and oil resistance, like a high-performance resin, and is formed in an annular shape as a whole. A first cylindrical portion 28 fitted in the inner peripheral surface so as to be movable in the axial direction, and a first annular portion 29 extending from the portion near the rear end of the inner peripheral surface of the first cylindrical portion 28 toward the inner diameter side. With.
The first anvil 25 is made of a hard metal such as case-hardened steel in a ring shape, and is attached to the rear side of the first ring portion 29. The rear side surface of the first anvil 25 is used as a pressed surface that is pressed by a bifurcated tip of a first release fork 45 described later.

  The first connecting member 26 is entirely made of a metal plate such as a steel plate in a cylindrical shape. The first clutch release bearing 19 is formed by the first annular member 29 by the first connecting member 26 fitted in the first annular member 29 and the first anvil 25 without rattling in the radial direction. Is supported on the front side surface of the slab so as to be slightly displaceable in the radial direction. For this purpose, the first annular portion 29, the first anvil 25, and the inner ring 20 are interposed between a pair of outward flanges 30a, 30b provided at both axial ends of the first connecting member 26. And the first aligning spring 27 are sandwiched between the first resin molded body 24, the first anvil 25, and the first clutch release bearing 19. At the same time, by providing a gap between the outer peripheral surface of the first connecting member 26 and the inner peripheral surface of the inner ring 20, the first clutch release bearing for the first resin molded body 24 is provided by this gap. 19 radial displacements are possible.

  Further, the first alignment spring 27 is assembled between the front outward flange 30 a constituting the first connecting member 26 and the inner ring 20. Such a first alignment spring 27 presses the inner ring 20 against the first annular portion 29 of the first resin molded body 24 to prevent the first clutch release bearing 19 from rattling, The first clutch release bearing 19 is allowed to be displaced in the radial direction. Various configurations of the aligning spring 27 are conventionally known and are not related to the characteristic portions of the present invention, and thus detailed illustration and description thereof will be omitted.

The second bearing unit 15 is entirely disposed on the outer diameter side of the guide cylindrical portion 16. Such a second bearing unit 15 has a configuration in which the inside and outside in the radial direction are reversed in comparison with the first bearing unit 14 described above. That is, the second bearing unit 15 includes a second bearing holder 31 that is externally supported so as to be axially movable with respect to the guide cylindrical portion 16, and a radial direction with respect to the second bearing holder 31. And a relatively large-diameter second clutch release bearing 32 supported in a slightly displaceable manner.
Of these, the second clutch release bearing 32 is formed at a position where the outer ring 33 that is a stationary wheel, the inner ring 34 that is a second rotating wheel, and the inner peripheral surface of the outer ring 33 and the outer peripheral surface of the inner ring 34 face each other. And a plurality of balls 35 provided so as to be freely rollable between the pair of raceway surfaces. Further, the front end portion of the inner ring 34 protrudes in the axial direction from the front end portion of the outer ring 33, and the front end edge of the inner ring 34 is folded back to the outer diameter side so that the center portion of the second diaphragm spring, which will be described later, extends in the axial direction. The pressing portion 36 is used for pressing.

The second bearing holder 31 is formed by combining a second resin molded body 37, a second anvil 38, a second connecting member 39, and a second aligning spring 40 with each other.
Of these, the second resin molded body 37 is made of the same synthetic resin as the first resin molded body 24 in an annular shape, and moves in the axial direction on the inner peripheral surface of the guide cylindrical portion 16. A second cylindrical portion 41 fitted inside is possible, and a second annular ring portion 42 extending from the portion near the rear end of the inner peripheral surface of the second cylindrical portion 41 toward the inner diameter side.
The second anvil 38 is made of a metal similar to that of the first anvil 25 and is formed in an annular shape, and is attached to the rear side surface of the second annular portion 42. The rear side surface of the second anvil 38 is used as a pressed surface that is pressed by a tip portion of a second release fork 46 described later.

  The second connecting member 39 is entirely made of a metal plate similar to the first connecting member 26 in a cylindrical shape. The second clutch release bearing 32 is formed by the second annular member 42 by the second connecting member 39 that is externally fitted to the second annular member 42 and the second anvil 38 without rattling. Is supported on the front side surface of the slab so as to be slightly displaceable in the radial direction. For this purpose, the second annular portion 42, the second anvil 38, and the outer ring 33 are provided between a pair of inward flange portions 43 a and 43 b provided at both axial ends of the second connecting member 39. And the second aligning spring 40 are sandwiched between the second resin molded body 37, the second anvil 38, and the second clutch release bearing 32. At the same time, by providing a gap between the inner peripheral surface of the second connecting member 39 and the outer peripheral surface of the outer ring 33, the second clutch release bearing for the second resin molded body 37 is provided by this gap. 32 radial displacements are possible.

  The second alignment spring 40 is assembled between the front inward flange portion 43 a constituting the second connecting member 39 and the outer ring 33. Such a second aligning spring 40 presses the outer ring 33 against the second annular portion 42 of the second resin molded body 37 to prevent the second clutch release bearing 32 from rattling, The radial displacement of the second clutch release bearing 32 is allowed. Various arrangements of the aligning spring 40 as described above are conventionally known and are not related to the features of the present invention.

  When the clutch release bearing device of this example configured as described above is assembled to a dry DCT, the guide cylindrical portion 16 constituting the front cover 13 is concentrically connected to the engine flywheel. Further, the flange portion 17 constituting the front cover 13 is coupled and fixed to a clutch case (not shown) while being arranged in the axial direction of the first and second diaphragm springs (not shown). Further, in this state, the first bearing unit 14 is arranged with respect to the axial direction between the central portion of the first diaphragm spring and the bifurcated tip of the first release fork 45 that is swingably assembled to the vehicle body side. Place between. The bifurcated tip portion is inserted from the outer diameter side to the inner diameter side of the guide cylindrical portion 16 through a pair of insertion holes 44, 44 provided in the guide cylindrical portion 16, respectively. At the same time, the second bearing unit 15 is disposed between the central portion of the second diaphragm spring and the tip of the second release fork 46 that is swingably assembled to the vehicle body side in the axial direction.

  In this state, when the rear side surface of the first anvil 25 is pressed by the bifurcated tip of the first release fork 45 during driving of the vehicle, the first bearing unit 14 is moved into the guide cylindrical portion 16. It moves to the front side along the peripheral surface, and the pressing portion 23 presses the central portion of the first diaphragm spring in the axial direction. As a result, based on the operation of a known mechanism, the connection of one of the two systems of clutches constituting the DCT is disconnected. As described above, when the rear side surface of the first anvil 25 is pressed by the bifurcated tip of the first release fork 45, the bifurcated tip of the first release fork 45 inserted through the insertion holes 44, 44. The shift portion moves in the axial direction by an amount corresponding to the pressing stroke inside the insertion holes 44, 44. However, with this movement, a part of the first release fork 45 does not interfere with a part of the second bearing unit 15 or the second release fork 46. In other words, in the case of this example, the axial dimensions and formation positions of both the insertion holes 44, 44, and further, the both releases are made so that both the allowance of the movement in the axial direction and the prevention of the interference can be compatible. The installation positions of the forks 45 and 46 are regulated. On the other hand, when the rear side surface of the second anvil 38 is pressed by the distal end portion of the second release fork 46, the second bearing unit 15 moves forward along the outer peripheral surface of the guide cylindrical portion 16, The pressing portion 36 presses the central portion of the second diaphragm spring in the axial direction. As a result, based on the operation of a known mechanism, the other clutch of the two systems of clutches is disconnected.

  When the pressing portion 23 presses the central portion of the first diaphragm spring, if there is an eccentricity between the first clutch release bearing 19 and the first diaphragm spring, this first The eccentricity is eliminated by the clutch release bearing 19 being displaced in the radial direction with respect to the first bearing holder 18. Similarly, when an eccentricity is generated between the second clutch release bearing 32 and the second diaphragm spring when the pressing portion 36 presses the central portion of the second diaphragm spring, The eccentricity is eliminated when the two-clutch release bearing 32 is displaced in the radial direction with respect to the second bearing holder 31. In the state where the pressing portion 23 presses the central portion of the first diaphragm spring, the outer ring 21 of the first clutch release bearing 19 rotates together with the first diaphragm spring, so that the first diaphragm spring And the first release fork 45 are allowed to rotate relative to each other. Similarly, in a state where the pressing portion 36 presses the central portion of the second diaphragm spring, the inner ring 34 of the second clutch release bearing 32 rotates together with the second diaphragm spring, whereby the second diaphragm Relative rotation between the spring and the second release fork 46 is allowed.

  In the case of the clutch release bearing device of the present example constructed and operated as described above, the first bearing unit 14 and the second bearing unit 15 are arranged on the inner diameter side and the outer diameter side of the guide cylindrical portion 16. They are arranged. For this reason, there is substantially no structural restriction to prevent the first and second bearing units 14 and 15 from interfering with each other in the respective operation ranges, and the degree of freedom in design is accordingly increased. It is easy to reduce the size and weight.

  In the above-described embodiment, the release fork is employed as means for pressing the first bearing unit in the axial direction toward the first diaphragm spring during use. However, when the present invention is carried out, as the means, a hydraulic cylinder and a feed screw device installed on the back side of the first bearing unit (the side opposite to the first diaphragm spring in the axial direction) instead of the release fork. It is also possible to employ a pressing device such as When such a pressing device is employed, it is not necessary to provide an insertion hole for inserting the release fork in a part of the cylindrical hollow shaft that is the guide shaft.

DESCRIPTION OF SYMBOLS 1 Front cover 2 1st bearing unit 3 2nd bearing unit 4 Guide cylindrical part 5 1st bearing holder 6 1st clutch release bearing 7 Inner ring 8 Press part 9 2nd bearing holder 10 2nd clutch release bearing 11 Inner ring 12 Press Part 13 Front cover 14 First bearing unit 15 Second bearing unit 16 Guide cylindrical part 17 Flange part 18 First bearing holder 19 First clutch release bearing 20 Inner ring 21 Outer ring 22 Ball 23 Press part 24 First resin molded body 25 First One anvil 26 First connecting member 27 First aligning spring 28 First cylindrical portion 29 First annular portion 30a, 30b Outward flange portion 31 Second bearing holder 32 Second clutch release bearing 33 Outer ring 34 Inner ring 35 Ball 36 Press Part 37 Second resin molded body 38 Second anvil 39 Second connecting member 40 Second alignment spring 4 The second cylindrical portion 42 the second circle ring section 43a, 43b inward flange portion 44 insertion hole 45 first release fork 46 second release fork

Claims (2)

A guide shaft, a first bearing unit, and a second bearing unit;
Of these, the guide shaft is disposed in the axial direction of the first and second diaphragm springs arranged concentrically to constitute the clutch device,
The first bearing unit includes a first bearing holder that is supported so as to be movable in the axial direction with respect to the guide shaft, and a first bearing that is supported so as to be displaceable in the radial direction with respect to the first bearing holder. The first clutch release bearing includes a clutch release bearing, and the first clutch release bearing rotates with the first diaphragm spring while pressing the central portion of the first diaphragm spring in the axial direction at least during shifting operation. With a first rotating wheel,
The second bearing unit is supported by a second bearing holder that is axially movable with respect to the guide shaft, and is supported by the second bearing holder so as to be displaceable in the radial direction. The clutch release bearing is provided, and the second clutch release bearing among them rotates at the same time as the second diaphragm spring while pressing the central portion of the second diaphragm spring in the axial direction at least during the shifting operation. Having a second rotating wheel,
In the clutch release bearing device,
The guide shaft is a cylindrical hollow shaft,
The first bearing holder is fitted into the inner peripheral surface of the guide shaft so as to be movable in the axial direction,
The clutch release bearing device, wherein the second bearing holder is fitted on the outer peripheral surface of the guide shaft so as to be movable in the axial direction. An insertion hole through which a release fork for axially pressing the first bearing unit toward the first diaphragm spring is provided in a part of a cylindrical hollow shaft that is the guide shaft. The clutch release bearing unit according to claim 1.

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