JPH077624Y2 - Release bearing for pull clutch - Google Patents

Description

[Detailed Description of the Invention] A. Purpose of the Invention (1) Field of Industrial Use The present invention transmits the driving force by pulling the inner peripheral end of the diaphragm spring through a release hub that slides by a release fork. The present invention relates to a pull-type clutch for disconnecting, and particularly to a structure of a release bearing arranged between a release hub and a diaphragm spring.

(2) Conventional technology In a pull-type clutch release mechanism for a vehicle, a release fork that rotates in conjunction with the operation of a clutch pedal causes a release hub to slide in the axial direction of a mission input shaft, and a release bearing is attached to the release hub. The power transmission of the clutch is cut off by pulling the inner peripheral end of the diaphragm spring locked through the clutch.

Such a conventional release mechanism of a pull type clutch carries a release bearing on a release hub which is slidable along a transmission input shaft, and an engaging portion is projectingly provided on an end surface of an outer race of the release bearing on a flywheel side. A set ring is attached to a groove formed on the outer circumference of the outer race, and an inner peripheral end of a diaphragm spring is locked between the engaging portion of the outer race and the set ring (for example, JP-A-63-38721). See the bulletin).

(3) Problems to be Solved by the Invention However, the above-mentioned conventional release mechanism uses a set ring mounted in a groove formed on the outer circumference of the outer race as a means for locking the inner peripheral end of the diaphragm spring to the outer race of the release bearing. Therefore, not only the number of parts is increased, but also the number of assembling steps is increased, which causes a cost increase.

The present invention has been made in view of the above circumstances, and an object thereof is to securely and easily lock a diaphragm spring to a release bearing without using a fixing means such as a set ring.

B. Configuration of the Invention (1) Means for Solving the Problems To achieve the above object, the invention is carried by a release hub that slides in the axial direction of a mission input shaft by a release fork, and a diaphragm spring is attached to an outer race of the release hub. Is a release bearing of a pull-type clutch that locks the inner peripheral end of the outer race, wherein an outer peripheral portion of the outer race is provided with an engaging portion and an annular protrusion that project radially outward from the tip end side of the mission input shaft. An annular groove for locking the inner peripheral end of the diaphragm spring is formed between the engaging portion and the annular protrusion, and the radius of the annular protrusion is smaller than the inner peripheral end radius of the diaphragm spring in a free state, and Set the radius larger than the radius of the inner peripheral edge of the diaphragm spring in the attached state, and make sure that the release fork comes into contact with the release spring. The radius of the flange of the hub is set smaller than the inner radius of the diaphragm spring in the free state, and the radius of the engaging part is set larger than the inner radius of the diaphragm spring in the free and assembled states. It is characterized by having done.

(2) Operation According to the features of the present invention described above, when the release hub carrying the release bearing is inserted into the inner peripheral end of the diaphragm spring in the free state, the radius of the flange of the release hub and the annular protrusion formed on the outer race of the release bearing are inserted. Since the radius of each is smaller than the radius of the inner peripheral edge of the diaphragm spring in the free state, the release bearing is inserted up to the position where the engaging portion of the outer race contacts the inner peripheral edge of the diaphragm spring. When the assembly of the clutch is completed from this state and the diaphragm spring is in the assembled state, the radius of the inner peripheral end is reduced and becomes smaller than the radius of the annular protrusion of the outer race. As a result, the inner peripheral end of the diaphragm spring is locked in the annular groove formed between the engaging portion of the outer race and the annular protrusion so as not to move in the axial direction. Since no fixing means such as a set ring is used for assembling this diaphragm spring, the number of parts and the number of assembling steps can be reduced.

(3) Embodiment An embodiment of the present invention will be described below with reference to the drawings.

1 to 4 show an embodiment of the present invention.
Fig. 2 is a longitudinal sectional view of the vehicle clutch, Fig. 2 is II- in Fig. 1.
A sectional view taken along line II, FIG. 3 is an enlarged view of a main part of FIG. 1, and FIGS.

As shown in FIGS. 1 and 2, this clutch is a pull-type dry multi-plate clutch and is housed inside a clutch housing 1 provided between the engine E and the mission M. A generally disk-shaped flywheel 3 is fixed to the rear end of the crankshaft 2 extending from the engine E with bolts 4. A ball bearing 5 mounted at the center of the flywheel 3 and a ball bearing 6 provided at the rear end of the clutch housing 1 support a mission input shaft 7 arranged coaxially with the crankshaft 2.

A hub 9 and 9'supporting two clutch disks 8 and 8'are fitted to a spline 7a formed at the tip of the mission input shaft 7 so as to be slidable in the axial direction and non-rotatable relative to each other. Facing 10,10 'on both front and back of 8,8'
Is stuck. A pressure plate 13 is supported by a rivet 14 on the inner surface of a clutch cover 12 fixed to the flywheel 3 with bolts 11. The pressure plate 13 and the flywheel 3 are supported by the pressure plate 13.
Further, another pressure plate 13 'is provided so as to be movable in the axial direction. The facing 10 of the clutch disk 8 faces the pressure plates 13 and 13 'so as to be able to abut, and the facing 10' of the clutch disk 8'faces the pressure plate 13 'and the flywheel 3 so as to abut. ing.

A cylindrical bearing retainer 15 is press-fitted at the end of the clutch housing 1 on the mission M side so as to cover the mission input shaft 7. A release hub 17 carrying a release bearing 16 is mounted on the outer periphery of the bearing retainer 15.
Are fitted so as to be slidable in the axial direction. Release bearing
Reference numeral 16 is provided with an inner race 18 integrally formed at the tip of the release hub 17 and an outer race 19 supported on the outer periphery of the inner race 18 so as to be rotatable relative to each other. The inner peripheral end of the diaphragm spring 20 is held on the outer race 19 so as to be immovable in the axial direction. The radial middle portion of the diaphragm spring 20 is in contact with a pressing protrusion 13a provided on one side surface of the pressure plate 13, and the elastic force thereof urges the pressure plate 13 to the right side in FIG. This allows the clutch discs 8,8 '
Facings 10, 10 'are both pressure plates 13, 13'
The driving force is transmitted from the crankshaft 2 to the mission input shaft 7 side by being pinched between the flywheel 3 and the flywheel 3.

A fork support 21 having a hook 21a formed at its tip is fixed to the inner wall of the clutch housing 1 with a bolt 22. A fulcrum pin 24 provided at an intermediate portion of the release fork 23 is rotatably engaged with the hook 21a and is locked by a fork spring 25. The base end of the release fork 23 is a fork insertion hole formed in the clutch housing 1.
The rod 27 of the release cylinder 26 is engaged with a hemispherical recess 23a formed on the protruding portion from the outside. On the other hand, at the tip of the release fork 23, 2
A bifurcated fork portion 28 that branches into book arms 28a and 28b is formed. The pair of arms 28a, 28b of the bifurcated fork portion 28 are engaged with the hub surface 29 formed on the outer periphery of the release hub 17 and are in contact with the side surfaces of the flange 17a that is continuously provided on the rear portion of the hub surface 29. There is. Therefore, when the rod 27 of the release cylinder 26 is extended and the hemispherical recess 23a of the release fork 23 is pressed, the release fork 23 swings around the fulcrum pin 24 and the forked fork portion formed at the tip thereof. 28 presses the flange 17a of the release hub 17. Then, the release hub 17 moves to the left in FIG. 1 and pulls the inner peripheral end of the diaphragm spring 20 to face the clutch disks 8 and 8 '.
The surface pressure of 0,10 'is released and the transmission of the driving force is cut off.

As shown in detail in FIG. 3, on the outer periphery of the outer race 19 of the release bearing 16, a brim-shaped engaging portion 19a protruding outward in the radial direction and an annular projection protruding rearward of the engaging portion 19a are provided.
19b are integrally formed, and the diaphragm spring 20 is provided in an annular groove 19c formed between the engaging portion 19a and the annular protrusion 19b.
Has an inner peripheral end engaged with it so as to be immovable in the axial direction. Further, the release hub 17 is integrally formed with the inner race 18 of the release bearing 16 at the end on the engine E side,
The flange 17a is integrally formed at an end portion on the side of the mission M, and a hub surface 29 with which the fork-shaped fork portion 28 of the release fork 23 is engaged is formed at an intermediate portion thereof.

When the diaphragm spring 20 is in the free state (3rd
(Dashed line in the figure), the radius R ₀ of the inner peripheral edge is the asterisk
Slightly larger than the radius r ₁ of the annular projection 19b of 19 and the radius r _{2 of the} flange 17a formed at the rear end of the release hub 17,
Moreover, it is set to be smaller than the radius r ₃ of the engaging portion 19a. And this diaphragm spring 20
Is assembled inside the clutch cover 12 (shown by the solid line in FIG. 3), the diameter R ₁ of the inner peripheral end of the diaphragm spring 20 is increased.
Is set to be slightly smaller than the diameter r ₁ of the annular projection 19b.

As shown in FIG. 4 (a), the cross section of the hub surface 29 of the release hub 17 is formed into a substantially lemon shape. That is, the hub surface 29 has a pair of arcuate surfaces c ₁ and c ₂ facing each other forming a part of the basic cylinder o and a distance equal to the diameter d of the basic cylinder o, and the pair of arcuate surfaces c ₁ , C ₂ and two sets of parallel planes p ₁ and p ₂ ; p ₃ and p ₄ which are tangentially connected to both ends. Therefore, this hub surface 29 has only _two edges e ₁ and e ₂ located at both ends of its diameter.

On the other hand, a pair of arms 28a, 28b of the forked portion 28 of the release fork 23 are formed with contact surfaces q ₁ , q ₂ which are parallel to each other, and the distance between them is the diameter d of the base circle o. Are set equal. Therefore, release fork 23
When the bifurcated fork portion 28 is engaged with the hub surface 29 of the release hub 17, the two come into close contact with each other without a gap as shown in FIG. 4 (d). A chamfer 30 is formed on the facing surface q ₂ at the tip of one arm 28b of the pair of arms 28a, 28b.

Next, the operation of the embodiment of the present invention having the above configuration will be described.

In the process of assembling the clutch, the procedure of assembling the diaphragm spring 20 and the release fork 23 becomes a problem.

In FIG. 3, the clutch cover 12 is a flywheel 3
If not attached to the diaphragm spring,
20 is in a state of a chain line slightly expanded outward, and the radius of its inner peripheral edge is R ₀ . Release hub from this state
When 17 is inserted in the direction of the arrow along the bearing retainer 15, the radius r ₂ of the flange 17a of the release hub 17 and the radius r ₁ of the annular protrusion 19b formed on the outer race 19 of the release bearing 16 carried by the release hub 17 are both. Since the radius R ₀ is smaller than the radius R ₀ , the release hub 17 is inserted into the position shown in the drawing and abuts on the engaging portion 19a of the outer race 19 without interfering with the inner peripheral end of the diaphragm spring 20. When the clutch cover 12 is fixed to the flywheel 3 with the bolts 11 from this state, the diaphragm spring 20 is pushed by the pressing protrusion 13a and the portion inside the fulcrum is the fulcrum ring 12a provided on the inner periphery of the clutch cover 12 as the fulcrum. Moved to the mission M side. As a result, the radius of the inner peripheral end of the diaphragm spring 20 is reduced to R ₁ which is smaller than the radius r ₁ of the annular protrusion 19b of the outer race 19, and the diaphragm spring 20 is stably held in the annular groove 19c of the outer race 19. .

When the constituent elements of the clutch including the diaphragm spring 20 are assembled as described above, the spline 7a formed at the tip of the mission input shaft 7 is then fitted to the clutch discs 8 and 8 ', and the clutch housing 1 The release fork 23 is temporarily fixed in advance in the clutch housing 1 so that the fulcrum pin 24 is located above the hook 21a of the fork support 21 in FIG. 1 at this time. After assembling the clutch housing 1 and the mission M, the release fork 23 is released from the temporary fixing and lowered downward, and its forked portion 28 is engaged with the hub surface 29, and at the same time, the fulcrum pin 24 is forked. It is held by a fork spring 25 by engaging with a hook 21a of the support 21. Finally, the tip of the rod 27 of the release cylinder 26 is engaged with the hemispherical recess formed at the base end of the release fork 23, and the assembly of the clutch portion is completed.

Next, a procedure for engaging the bifurcated fork portion 28 of the release fork 23 with the hub surface 29 of the release hub 17 will be described. For example, as shown in FIG. 4 (a), a release hub
Release fork 17 with two edges e ₁ and e ₂ indicated by arrows
Assuming that the release fork 23 is positioned substantially orthogonal to the assembling direction of 23, the release fork 23 is advanced from this state in the assembling direction. Then, one arm 28b of the two arms 28a, 28b of the bifurcated fork 28 has a chamfer 30, so that the tip of the contact surface q ₁ of the other arm 28a having no chamfer is first. Abut on the parallel surface p ₁ .

When the release fork 23 is moved forward, as shown in FIG. 4 (b), the release fork 23 is pressed against the tip of the contact surface q ₁ and released.
Starts rotating in the direction of the arrow. At this time, release hub
Since the edge e ₂ of 17 is prevented from interfering with the arm 28b by the chamfer 30, the release hub 17 can rotate without trouble. When the further advancement of the release fork 23, as shown in FIG. 4 (c), engagement of the edge e ₂ is parallel plane p ₂ reaches the tip of the abutting surface q ₂ abutting surface q ₂ is started It
Then, as shown in FIG. 4 (d), finally the arm 28
The contact surface q _{1 of a} is engaged with the parallel surface p ₁ and the arm 28b
The contact surface q _{2 of} is engaged with the parallel surface p ₂ to complete the assembly of the release fork 23 to the release hub 17. Then,
In this state, release hub for release fork 23
The relative rotation of 17 is restricted to prevent sliding noise and wear.

According to the release fork 23 and the release hub 17 having the shapes shown in FIG. 4, the two edges e ₁ , e ₂ of the release hub 17 are
No matter what position the release fork 23 occupies with respect to the assembling direction, the bifurcated fork portion 28 can be easily engaged with the hub surface 29 of the release hub 17 simply by advancing the release fork 23 in the assembling direction. It becomes possible. In this case, one arm 28b of the forked part 28 is chamfered 30.
Instead of forming the above, the part on the tip side of the contact surface q _{2 of the} arm 28b may not be formed on the arm 28b from the beginning.

With the clutch assembled as described above, the release hub 17 is in the state of being moved to the engine E side when the release cylinder 26 is inoperative, and the diaphragm spring
The elastic force of 20 transmits the driving force from the engine E to the mission M. When the release cylinder 26 is extended, the release fork 23 swings about the fulcrum pin 24, and the forked fork portion 28 at the tip thereof presses the flange 17a of the release hub 17. This allows the release hub 17
Moves to the mission M side along the bearing retainer 15, and the engaging portion 19a protruding from the outer race 19 of the release bearing 16 formed integrally with the release hub 17 pulls the inner peripheral end of the diaphragm spring 20 to the mission M side. To do. As a result, the urging force of the diaphragm spring 20 on the pressure plate 13 is released, the surface pressure of the facings 10 and 10 'of both clutch discs 8 and 8'is eliminated, and the transmission of the driving force is interrupted. At this time, since the inner race 18 of the release bearing 16 is formed integrally with the end portion of the release hub 17, the release bearing 16 is prevented from falling off the release hub 17 due to the release load for engaging and disengaging the clutch.

In the above embodiment, the inner race 18 of the release bearing 16 is formed integrally with the release hub 17,
It is also possible to form the inner race 18 with a separate member from the release hub 17.

C. Effect of the Invention As described above, according to the present invention, the radius of the inner peripheral edge of the diaphragm spring is large in the free state and small in the assembled state. Therefore, in the free state, the flange of the release hub and the release bearing are used. After passing the annular protrusion formed on the outer race of the inner peripheral end,
By mounting the diaphragm spring and reducing the inner peripheral end radius thereof to be smaller than the radius of the annular protrusion of the outer race, the inner peripheral end of the diaphragm spring is axially aligned with the annular groove formed between the engaging portion of the outer race and the annular protrusion. It can be locked so that it cannot move in the direction. Therefore, no other fixing means such as a set ring is required for assembling the diaphragm spring, and the number of parts and the cost for assembling can be reduced.

[Brief description of drawings]

1 to 4 show an embodiment of the present invention.
Fig. 2 is a longitudinal sectional view of the vehicle clutch, Fig. 2 is II- in Fig. 1.
A sectional view taken along line II, FIG. 3 is an enlarged view of a main part of FIG. 1, and FIGS. 7 ... mission input shaft, 16 ... release bearing,
17 ... Release hub, 17a ... Flange, 19 ... Outer race, 19a ... Engaging part, 19b ... Ring projection, 19c ... Ring groove, 20 ... Diaphragm spring, 23 ... Release fork

Front Page Continuation (72) Inventor Kazuhiro Nakano 1-4-1 Chuo, Wako City, Saitama Inside Honda R & D Co., Ltd. (56) Reference JP-A-64-65334 (JP, A) JP-A-1- 250622 (JP, A) JP 61-134642 (JP, B2)

Claims (1)

[Scope of utility model registration request] 1. A release hub (17) which slides in the axial direction of a mission input shaft (7) by a release fork (23).
A release bearing (16) of a pull clutch that is carried by the outer race (19) and locks the inner peripheral end of the diaphragm spring (20) to the outer race (19), and the mission input shaft (7) is provided on the outer periphery of the outer race (19). By connecting the engaging portion (19a) protruding outward in the radial direction and the annular projection (19b) from the tip side of the diaphragm spring (19a) and the annular projection (19b), the diaphragm spring ( Annular groove (19) that locks the inner peripheral edge of (20)
c), the radius (r ₁ ) of the annular projection (19b) is smaller than the inner peripheral end radius (R ₀ ) of the diaphragm spring (20) in the free state, and the diaphragm spring (in the assembled state). The radius (r ₂ ) of the flange (17a) of the release hub (17) against which the release fork (23) abuts while being set larger than the inner peripheral edge radius (R ₁ ) of ₂₀ ).
Is set to be smaller than the inner peripheral edge radius (R ₀ ) of the diaphragm spring (20) in the free state, and the engagement portion (19
release bearing of the pull type clutch, characterized in that set larger than the inner peripheral end of the diaphragm spring (20) with a radius (r ₃₎ to the free state and assembled state of a) the radius (R _0, R ₁₎ .