JPH07103256A - Pull type clutch - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a pull-type clutch that facilitates alignment between a release bearing shifter and a release fork when a clutch and a transmission are combined. [Structure] Below the engaging projection 15 at the rear end of the shifter portion 23 of the shifter body 18, a tilt guide 2 that is a first guide portion
When the bearing shifter 5 is tilted leftward and rightward by a predetermined angle or more, the release fork 6 contacts the cam follower 16 when the release fork 6 moves forward. A pair of left and right long rectangular guide surfaces 26 are formed on the rear end surface of the holder portion 22 of the shifter body 18. The outer peripheral surface of the cam follower 16 abuts on these guide surfaces 26 when the release fork 6 moves forward. Under the front end of the shifter portion 23, arc guides 27 and 28 that are second guide portions are formed on the left and right sides.
The flat portions 29 formed on the left and right side surfaces of the are smoothly continuous.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pull type clutch used in a power transmission system of an automobile or the like, and more particularly to a technique for facilitating assembly thereof.

[0002]

2. Description of the Related Art Generally, in automobiles and the like, a diaphragm spring type dry plate single plate clutch is used to connect and disconnect power between an engine and a transmission. In this type of clutch, a so-called push type, in which a release fork presses an inner peripheral portion of a diaphragm spring through a release bearing at the time of disengagement, has been a mainstream.

However, in the push type clutch,
The pressing force of the pressure plate against the clutch disc was relatively small, and it was difficult to increase the capacity of the clutch. Also, since the pivot ring, which is the fulcrum, is located in the middle of the pressure plate, the operating force of the release fork is large due to the lever ratio, and a large clutch booster, which is a booster, can be used, or a release fork, etc. It was necessary to increase the strength of Further, the release bearing also has a drawback that its life is shortened because it rotates while receiving a large thrust load at the time of cutting.

Accordingly, in recent years, pull type clutches as shown in FIG. 11 have been increasingly adopted in large trucks and the like equipped with a high output engine. In this clutch, a pivot ring 1 serving as a fulcrum at the time of reversing is arranged on an outer peripheral portion of a diaphragm spring 2, and an intermediate portion of the diaphragm spring 2 presses a pressure plate 3. Further, a bearing shifter 5 containing a release bearing 4 is fixed to the inner peripheral portion of the diaphragm spring 2, and at the time of cutting, the bearing shifter 5 is pulled by a release fork 6 in a direction indicated by an arrow in the drawing to reverse the diaphragm spring 2. Let As a result, the distance between the flywheel 7 coupled to a crankshaft (not shown) on the engine side (hereinafter referred to as the front) and the pressure plate 3 increases, and the drive pinion 8 on the transmission side (hereinafter referred to as the rear) is spline-fitted. The fitted clutch disc 9 is released and the power is cut off. The release fork 6 is swingably held by a clutch housing 12 fixed to a transmission case 11 via a fork shaft 10, and the pivot ring 1 is held by a clutch cover 13 fixed to a flywheel 7. In the figure, 14 is a bearing guide that fits into the bearing shifter 5 and guides it, and is fixed to the clutch housing 12.

By adopting such a configuration, the effective outer diameter of the diaphragm spring 2 becomes larger than that of the conventional push type, and even if the overall size of the clutch is the same, the force for pressing the pressure plate 3, that is, the capacity of the clutch. Can be increased. Further, since the pivot ring 1 which is a fulcrum is located on the outer periphery of the diaphragm spring 2, the lever ratio at the time of cutting becomes larger than that of the push type, and the operating force of the release fork 6 can be reduced. Therefore, the above-mentioned problem caused by the excessive operating force is solved, and it is possible to realize a clutch that has a large capacity, is lightweight, is low in cost, and has a long maintenance interval.

[0006]

However, this pull type clutch also has the following problems. Usually, a pair of left and right engaging projections 15 is formed at the rear end of the bearing shifter 5, and is engaged with a pair of cam followers 16 rotatably held on the upper end of the release fork 6. . As a matter of course, the engagement surfaces 15a of the engagement projections 15 need to accurately face the outer peripheral surface of the cam follower 16 in order to prevent damage and dropout during clutch operation. However, as described above, since the bearing shifter 5 is internally provided with the release bearing 4, the sleeve 1 fixed to the diaphragm spring 2 is
Although 7 is fixed in the rotational direction, the shifter main body 18 on which the engaging projection 15 is formed freely rotates because there is no locking means. Therefore, when connecting the clutch and the transmission, the shifter body 18 often deviates from the regular assembly angle (the angle at which the line connecting the left and right engaging projections 15 is horizontal).

Since it is very difficult to correct the deviation of the angle after the engagement, at the final stage of the engagement, the service hole 19 formed in the clutch housing 12 is visually inspected and a jig or the like is used to shift the body 18 of the shifter. Was rotated for alignment. However, this work is not only complicated but also a factor that hinders the smooth flow of the assembly line. Especially in a maintenance shop, etc., when a large-capacity large-sized transmission at the rear end of a large-sized engine is to be assembled with a large heavy-weight transmission that has been lifted by a chain block, etc., the positioning may become more difficult due to its swinging. There were many.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a pull-type clutch that facilitates the alignment of the release bearing shifter and the release fork when the clutch and the transmission are combined. To aim.

[0009]

SUMMARY OF THE INVENTION In order to achieve this object, according to the present invention, the pressure plate is pressed against the clutch disc by the intermediate portion of the diaphragm spring whose outer peripheral portion is engaged with the clutch cover, while the diaphragm spring is being pressed. A bearing shifter containing a release bearing is fixed to the inner peripheral part of the, and a pair of engaging projections formed on the transmission side end of this bearing shifter are pulled by a fork-shaped release fork, thereby When the engine and the transmission are disengaged, the diaphragm spring is held on the engine side, and the release fork is attached to the clutch housing on the transmission side. In a pull-type clutch that is rotatably held via a gear, a guide portion that contacts the release fork and rotates the bearing shifter in a regular assembly angular direction is formed on the bearing shifter when the engine and the transmission are coupled. We propose a pull-type clutch characterized by the above.

[0010]

When the transmission is brought closer to the engine while the bearing shifter is displaced in the rotational direction during assembly, the guide portion formed on the bearing shifter first comes into contact with the release fork at a predetermined position. When the transmission is further brought closer in this state, the guide portion is pressed by the release fork, whereby the bearing shifter rotates in the regular assembling angle direction, and the alignment by a jig or the like becomes unnecessary.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention applied to a pull type clutch for a truck will be described below in detail with reference to the drawings. In the description of the embodiments, the same members as those of the conventional device described above are designated by the same reference numerals, and the duplicated description will be omitted. FIG. 1, FIG. 2 (a view from the arrow A in FIG. 1), and FIG. 3 (a view from the arrow B in FIG. 1) show the essential parts of the pull-type clutch of the present embodiment in a non-engaged state. As shown in these drawings, also in the apparatus of this embodiment, the bifurcated release fork 6 is rotatably held by the clutch housing 12 via the fork shaft 10, and the cam follower 16 is provided at the tip thereof. It is rotatably attached. Also,
The sleeve 17 of the bearing shifter 5 is fixed to the inner peripheral portion of the diaphragm spring 2, and the shifter main body 18
Also, it freely rotates by a release bearing (not shown) installed in the same way as the conventional device.

However, the release fork 6 of this embodiment is
Locking projections 20 and 21 that are release fork locking means are formed on the bearing guide 14 and the bearing guide 14, respectively, so that the release fork 6 can be locked in both the rotation direction and the axial direction of the fork shaft 10. It has become. That is, the release fork 6 is moved by its own weight as shown in FIG.
It rotates counterclockwise, and the rear end surface of the locking projection 20 is the first locking surface 21 of the locking projection 21 on the bearing guide 14 side.
By contacting a, the elevation angle θ (in this embodiment, θ =
25 °). Further, in the axial direction of the fork shaft 6, the left side surface of the locking projection 20 abuts on the second locking surface 21b of the locking projection 21 on the bearing guide 14 side, so that the dimension a to the left (in the present embodiment). Then, a = 3m
m) Locked at the offset position. When assembled, the release fork 6 freely rotates or slides in a predetermined range in the rotational direction and the axial direction.

On the other hand, the shifter body 1 of the bearing shifter 5
Reference numeral 8 includes a relatively large-diameter disk-shaped holder portion 22 for accommodating the release bearing, and a relatively small-diameter cylindrical shifter portion 23 extended to the rear portion of the holder portion 22. Engagement protrusions 15 are provided on the rear end of the shifter portion 23 in the left and right directions, and inclined guides 24 and 25 that are first guide portions are formed on the lower portions of the rear end surfaces of the engagement protrusions 15. . As shown in FIG. 3, these tilt guides 24 and 25 do not come into contact with the cam followers 16 even when the release fork 6 advances when the bearing shifter 5 is not tilted (that is, the regular assembly angle). However, the bearing shifter 5 has a predetermined angle to the left and right (in this embodiment,
5 °) or more, when the release fork 6 moves forward, the cam follower 16 and the left and right tilt guides 2
Either one of the four or 25 contacts. still,
The tilt guide 24 of the left engagement protrusion 15 and the right engagement protrusion 15
The tilt guide 25 corresponds to the offset of the release fork 6 described above, and its shape and size are different.

A pair of left and right long rectangular guide surfaces 26 are formed on the rear end surface of the holder portion 22 of the shifter body 18. The outer peripheral surface of the cam follower 16 abuts on these guide surfaces 26 when the release fork 6 moves forward. Then, at the lower front end of the shifter portion 23, the second
The circular arc guides 27 and 28, which are the guide portions, are formed on the left and right. These arc guides 27, 28 are
The flat portions 29 formed on the left and right side surfaces of the are smoothly continuous. The outer width of the flat portion 29 of the shifter portion 23 is slightly smaller than the inner width of the left and right cam followers 16 of the release fork 6.

The operation of this embodiment will be described below. In this embodiment, when the transmission is joined to the clutch at the rear end of the engine, the bearing guide 14 is first fitted into the shifter portion 23 of the shifter body 18, and the transmission, that is, the release fork 6 is moved forward. At this time, the shift in the rotation direction of the shifter main body 18 is previously set to 10 °.
Make the following adjustments. When the shift in the rotational direction of the shifter body 18 is in the range of 5 ° to 10 ° in the clockwise direction, as shown in FIGS. 4 and 5, the outer peripheral surface of the cam follower 16 of the release fork 6 is the engagement protrusion 15 on the right side. Abutting the inclined guide 25.

When the release fork 6 is further advanced from this state, the release fork 6 is locked by the locking projections 20 and 21 in the rotational direction as described above.
The cam follower 16 presses the inclined guide 25. As a result, the shifter body 18 rotates counterclockwise,
When the cam follower 16 comes off the tilt guide 25,
The deviation in the direction of rotation is corrected to 5 °. As shown in FIG. 6, when the shift direction of the shifter body 18 is 5 ° to 10 ° in the counterclockwise direction, the outer peripheral surface of the cam follower 16 of the release fork 6 is the engagement protrusion 15 on the left side. After contacting the tilt guide 24, the shifter body 18 rotates clockwise, and the shift in the rotation direction is corrected to 5 °.

Next, when the release fork 6 is further advanced from this state, the left and right cam followers 16 are engaged with the engaging projection 1.
5 and the lower surface of the holder portion 22 to come into contact with the guide surface 26, and the shifter portion 23 is provided directly above the right cam follower 16.
The circular arc guide 28 is positioned. At this point, the release fork 6 remains offset to the left. When the release fork 6 is further advanced from here, as shown in FIGS. 7 and 8 (a view taken in the direction of arrow D in FIG. 7),
The release fork 6 moves upward with the fork shaft 10 as an axis.
Rotates, and the cam follower 16 rises along the guide surface 26. When the cam follower 16 on the right side rises, the inner surface of the cam follower 16 comes into contact with the arc guide 28 and presses it obliquely upward. Then, the shifter body 18 further rotates counterclockwise to correct the deviation in the rotational direction, and the release fork 6 moves to the right by the reaction force from the arc guide 28.

When the release fork 6 further rotates and the cam follower 16 finishes pressing the circular arc guide 28, the shift of the shifter body 18 in the rotational direction almost disappears, and the release fork 6 is also positioned at the center of the bearing shifter 5 in the left-right direction. Come to do. When the release fork 6 further advances from here, as shown in FIGS. 9 and 10 (a view taken in the direction of arrow E in FIG. 9), the release fork 6 also further rotates and rises along the guide surface 26. The cam followers 16 are fitted so as to sandwich the left and right flat portions 29 of the shifter portion 23, and the assembling is completed.

The reason why the release fork 6 is offset to the left side when not coupled is as follows. That is, when the release fork 6 is locked by the locking projections 20 and 21 in a state where the center of the release fork 6 is aligned with the axis of the bearing shifter 5, if there is a manufacturing error or the like in the clutch housing or the transmission case, which are cast products, both of them are Problems may occur such that the release fork 6 is deformed by forcibly assembling it by abutting against it.
Therefore, in this embodiment, the release fork 6 is offset in advance in consideration of manufacturing errors and the like, and this offset is eliminated at the time of assembly.

Although the description of the specific embodiment has been completed, the embodiment of the present invention is not limited to this embodiment. For example, the shape and number of the guide portions, and the installation site can be variously changed from those of the above-described embodiment depending on the design or manufacturing convenience. Further, in the above embodiment, the release fork having the cam follower attached to the tip is used, but a release fork having a tip that directly slides on the engaging projection may be used.

[0021]

As described above in detail with reference to the embodiments, according to the pull-type clutch of the present invention, the bearing shifter is brought into contact with the cam follower of the release fork when the engine and the transmission are coupled, and the bearing shifter is properly assembled. Since the guide portion for rotating the bearing is formed on the bearing shifter, the positioning of the bearing shifter can be performed very easily, and the labor and time required for assembly can be significantly reduced.

[Brief description of drawings]

FIG. 1 is a side view showing a main part of an embodiment of a pull type clutch according to the present invention.

FIG. 2 is a view on arrow A in FIG.

3 is a view on arrow B in FIG. 1. FIG.

FIG. 4 is a rear view showing a state in which the cam follower is in contact with the first guide portion of the bearing shifter which is displaced clockwise.

5 is a view on arrow C in FIG. 4. FIG.

FIG. 6 is a rear view showing a state in which the cam follower is in contact with the first guide portion of the bearing shifter which is offset counterclockwise.

FIG. 7 is a rear view showing a state in which the cam follower is in contact with the second guide portion of the bearing shifter which is displaced clockwise.

FIG. 8 is a view on arrow D in FIG. 7.

FIG. 9 is a rear view showing a state in which the cam follower is fitted in the flat portion of the bearing shifter.

10 is a view on arrow E in FIG. 9. FIG.

FIG. 11 is a vertical cross-sectional view showing the entire pull type clutch.

[Explanation of symbols]

 1 Pivot Ring 2 Diaphragm Spring 3 Pressure Plate 4 Release Bearing 5 Bearing Shifter 6 Release Fork 9 Clutch Disc 10 Fork Shaft 11 Transmission 12 Clutch Housing 14 Bearing Guide 15 Engagement Protrusion 16 Cam Follower 18 Shifter Main Body 24, 25 Tilt Guide 26 Guide Surface 27 , 28 Arc guide 29 Flat part

Claims (5)

[Claims] 1. A pressure plate is pressed against a clutch disc by an intermediate portion of a diaphragm spring whose outer peripheral portion is engaged with a clutch cover, while a bearing shifter having a release bearing is fixed to the inner peripheral portion of the diaphragm spring. By pulling the pair of engaging projections formed on the transmission side end of the bearing shifter with a forked release fork, the inner peripheral portion of the diaphragm spring is attracted to the transmission side to disconnect the clutch, and In a pull-type clutch in which the diaphragm spring is held on the engine side when not coupled to the transmission, and the release fork is rotatably held on the transmission side clutch housing via a fork shaft. A pull-type clutch, wherein a guide portion is formed in the bearing shifter so as to contact the release fork and rotate the bearing shifter in a regular assembly angle direction when the engine and the transmission are coupled. 2. The pull-type clutch according to claim 1, wherein the guide portion is a guide surface formed on a transmission-side end surface of the engagement protrusion. 3. The pull-type clutch according to claim 1, wherein the guide portion is a guide surface formed on an outer peripheral surface of the bearing shifter. 4. The pull type according to claim 1, further comprising release fork locking means for locking the release fork at a predetermined rotation angle when the engine and the transmission are not coupled. clutch. 5. A release fork locking means for locking the release fork at a predetermined axial position with respect to the release fork shaft when the engine and the transmission are not coupled. The pull-type clutch described in 1 to 4.