JPH0532663Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a so-called pull-type clutch in which a release lever connected to a clutch pedal pulls a release bearing toward a transmission to perform a release operation. More specifically, it relates to a self-adjuster that can be automatically adjusted depending on the wear of the facing.

(Prior Art and its Problems) The present applicant has filed Japanese Patent Application No. 142,140/1983 regarding this type of pull type clutch.

In this prior art, as shown in FIG. 5, a diaphragm spring 12, a retainer 14, a lever 16 (load transmission lever), and a pressure plate 18 are provided inside a clutch cover 10, and a sleeve 20 connected to the retainer 14 is provided. A release operation is performed by a release lever 24 via a release bearing 22. The retainer 14 is prevented from rotating by a pin 15.
5 is fixed to the clutch cover 10 by a flange 15a.

In addition, in the figure, 17 is the outer fulcrum of the lever 16, and 2
5 is an inertia brake, 26 and 27 are clutch disks, 28 is an intermediate plate, and 29 is an engine flywheel.

By the way, the lever 16 is installed between the retainer 14 and the adjuster string 11 which is screwed to the clutch cover 10, but if the facings F of the clutch disks 26 and 27 wear out, the screw portion 10a of the adjuster string to the clutch cover 10, and tighten the adjuster ring 1.
1 in the clutch axis direction, which makes the adjustment work troublesome.

On the other hand, Japanese Patent Application Laid-Open No. 60-143228 based on U.S. Pat. No. 4,549,643 is known regarding an automatic clutch adjustment device. This device consists of a first boss member having a worm thread on its outer circumferential surface, a second boss member having a pin, first and second coil springs connecting both boss members, etc. 1. Since both boss members are elastically connected by the spring force of the second coil spring, there is room for improvement in that automatic adjustment cannot be performed smoothly.

(Purpose of the invention) The object of the invention is to provide a so-called pull-type clutch that can automate the adjustment of the adjuster string position when the clutch disk wears out, and can also make the automatic adjustment smooth.

(Structure of the invention) (1) Technical means The invention provides a clutch in which a release lever connected to a clutch pedal performs a tensile release operation to move the release bearing away from the flywheel. A lever for transmitting a load is provided with the side end connected, and a facing connected to the radially outer end of the lever is provided with a generally annular adjuster ring for adjusting the wear allowance, which is screwed onto the inner surface of the clutch cover. An opening is formed in a part of the clutch cover facing near the inner surface of the adjusting string, and a stay bracket having a bearing piece extending in the clutch axial direction from the opening through the diaphragm spring to near the inner surface of the adjusting string is fixed to the clutch cover. , the bearing piece is provided with a pin extending in the radial direction of the clutch, a pawl lever having a pawl at the tip that is rotatable around the pin, and a large diameter portion of the pin formed on the inner side in the circumferential direction of the clutch; A spring member is interposed between the pawl lever and the pawl lever to allow the pawl lever to move inward in the radial direction of the clutch and urge the pawl lever outward in the radial direction of the clutch, so that the pawl of the pawl lever touches the inner surface of the adjuster string. A pawl lever is formed to fit into the tooth surface of the ratchet, a sensing arm extending in the circumferential direction of the clutch is connected to the pawl lever, a sensing arm is provided with a sensing pin extending inward in the radial direction of the clutch, and the sensing arm is provided with a sensing arm extending inwardly in the radial direction of the clutch. A pull type characterized in that a sensing pin is fitted in a groove formed on the outer circumference of the retainer with a predetermined axial play in the groove, and a sensing pin is rotatably fitted around the pin along the groove. It is Kuratsuchi's self-adjust star.

(2) Effect When the clutch disc wears, the sensing pin moves together with the retainer over the play in the groove during clutch release (cutting) operation, the pawl lever rotates around the pin, and the tip pawl touches the inner surface of the adjuster string. Push the tooth surface of the ratchet and turn the adjuster ring to adjust the wear of the adjuster ring.

During clutch engagement (connection) operation, the pawl lever rotates in the opposite direction, and the entire pawl lever moves inward in the clutch radial direction while compressing the spring member, allowing the pawl to overcome the ratchet tooth surface and return to its initial state. .

(Embodiment) In FIG. 1 showing a longitudinal cross-sectional view of the clutch according to the present invention, the same reference numerals as in the description of the prior art indicate corresponding parts,
Only the differences will be explained below.

In FIG. 1, which shows only the upper half of the center line O, a substantially annular adjuster string 11 is fitted into the protrusion 30 (outer peripheral end) of the lever 16. The protrusion 30 is inserted into the groove 34 of the adjuster string 11, and the adjuster string 11 is inserted into the clutch cover 10 with the threaded portion 1.
They are screwed together at 0a so that the position can be freely adjusted in the axial direction.

Further, the intermediate fulcrum 40 of the lever 16 is constantly pressed against the fulcrum land portion 42 of the pressure plate 18 by the spring force of the diaphragm spring 12. A spherical inner fulcrum 37 is formed at the inner peripheral end of the lever 16 , and the inner fulcrum 37 fits into an annular groove 39 of the retainer 14 . As will be described in detail later, the adjuster string 11 is designed to move forward together with the lever 16 as the lever 16 moves forward when the facings F of the clutch disks 26, 27 wear out.

Next, self-adjust star 4, which is the gist of this invention.
Explain 0. This self-adjust star 40 is
Stave bracket 41, pin 42, claw lever 4
3, a sensing arm 44, a sensing pin 45, a coil spring 46, etc. The stay bracket 41 is a steel plate member consisting of a mounting part 14a and a bearing part 41b, and the mounting part 41a has three bolt holes 47 drilled therein.
The stay bracket 41 is fixed to the clutch cover 10 with square hole bolts 48. Bearing part 41b
(FIG. 3) is bent at a substantially right angle to the mounting portion 41a, and the window hole 49 of the clutch cover 10
and extends in the clutch axial direction toward the vicinity of the inner circumferential surface of the adjuster string 11 through the window hole 50 (FIG. 2) of the diaphragm spring 12. A pin hole 51 (FIG. 4) is bored in the bearing portion 41b, and a pin 42 is fitted into the pin hole 51. The pin 42 is fixed with a washer 53 and a cotter pin 54 at the upper end with the head 52 (large diameter part) disposed downward in the figure, that is, inward in the radial direction of the clutch.

The pawl lever 43 is rotatably fitted into this pin 42, and a coil spring 46 (spring member) that pushes the pawl lever 43 outward in the radial direction of the clutch is interposed between the pawl lever 43 and the head 52. It is equipped. The pawl lever 43 is integrally formed with a pawl 56 that engages with ratchet internal teeth 55 on the inner peripheral surface of the adjuster string 11.

The pin 42, pawl lever 43, etc. will be explained in FIG. 4, which is an exploded perspective view of the self-adjuster 40. However, since FIG. 4 is only a schematic diagram, there may be cases where the detailed structure differs from FIGS. 1 to 3. Figures 1 to 3
Illustrations take precedence.

In FIG. 4, the main body 57 of the pawl lever 43 has a hole 5.
8 and 59 are bored, and the pin 42 is inserted into the hole 58.
is fitted into the hole 59, and the sensing arm 44 is fixed to the hole 59 with a hexagon socket head bolt 60. The sensing arm 44 has a rod shape with holes 61 and 62 bored at both ends in the longitudinal direction, and the bolt 60 is passed through the hole 61 and tightened with a caulking nut (not shown), so that the clutch is in a position extending in the circumferential direction (FIG. 2). It is designed to be fixed to a claw lever 43. A sensing pin 45 is fitted into the hole 62, and the sensing pin 45 is fixed to the tip of the sensing lever 44. The sensing pin 45 extends substantially parallel to the pin 42 toward the inside of the latch in the radial direction, and the tip of the sensing pin 45 fits into the groove 63 shown in FIGS. 1 and 2.

This groove 63 is formed in a substantially arc shape along the rotation locus of the sensing pin 45 on the outer periphery of the retainer 14 so that the sensing pin 45 can be rotated around the pin 42 by moving the retainer 14 in the axial direction. formed on the surface. Furthermore, as shown in FIG. 1, the grooves 63 are separated by an axial play δ, which absorbs movement of the retainer 14 during release/engagement operations under normal conditions before the facing F wears out. It is set to do so. Note that the shape of the groove 63 is not limited to the case where the groove 63 is formed in a substantially arc shape that tightly fits the sensing pin 45;
It is also possible to form a rectangular groove extending in the clutch axial direction that allows the sensing pin 45 to rotate around the pin 42 with play in the clutch circumferential direction between the two.

As shown in FIG. 1, the pin 42, claw lever 43, coil spring 46, etc. are arranged in the window hole 50 of the diaphragm spring 12 so as not to obstruct the movement of the diaphragm spring 12. The retainer 14 is the sleeve 20
It is provided above so as to be able to slide freely in the axial direction while being biased to the left in the figure by a coil spring 66.

Next, the effect will be explained. In the clutch engaged state shown by the solid line in FIG. 1, the spring force of the diaphragm spring 12 pushes the retainer 14 in the direction of arrow A, and this spring force is transmitted to the pressure plate 18 while being multiplied by the lever 16. Clutch disks 26 and 27 (FIG. 5) are pressed together.

By operating the release lever 24 (FIG. 5), the sleeve 2 is released via the release bearing 22.
When releasing the clutch by pulling 0 in the reverse A direction,
The retainer 14 moves in the reverse A direction. Lever 1
6 is tilted into a posture shown by reference numeral 16a in the figure. At this time, the sensing pin 45 is moved into the groove 6 by the play δ.
3, the sensing pin 45 connects to the pin 42.
It does not rotate around. Therefore, the clutch engagement/release operation is performed in the same manner as usual before the facing F is worn out.

When the facing F is worn, the lever 16 moves in the direction of arrow A by the amount of wear to a point 16b indicated by a broken line in FIG. At this time of wear, the adjuster string 11 also needs to move in the direction of arrow A, and the self-adjuster 40 needs to move as described below.
The position of the adjuster string 11 is automatically adjusted by.

If the amount of wear of the facing F is α, the retainer 14 will move by approximately α in the direction of arrow A, and the amount of tension on the retainer 14 at the time of release will be approximately δ+α (1).

At this time, the sensing pin 45 rotates by approximately α in the direction of arrow R in FIG. 3, and the pawl lever 43 rotates around the pin 42. Eventually, α increases and the claw lever 43
When the pawl 56 reaches one notch of the ratchet internal tooth 55 of the adjuster string 11, the pawl 56 pushes the ratchet internal tooth 55 in the direction of arrow B in FIG. 2, and the adjuster string 11 rotates. Aji ring 1
1 rotates, the adjuster string 11 moves in the direction of arrow A due to the thread pitch of the threaded portion 11a.

Therefore, by repeating the clutch engagement/release operation, the asian string 11,
The adjuster string 11 moves in the direction of arrow A until the relative positional relationship of the lever 16, pressure plate 18, etc. reaches its initial state before the facing F wears out.
direction and automatic adjustment is performed.

When the clutch is engaged, the sensing pin 45 rotates in the reverse R direction in the groove 63, and the pawl 56 of the pawl lever 43
also returns in the opposite B direction. At this time, the ratchet internal teeth 5
The pawl 56 rotates so as to ride over the tooth surface of the clutch 5, and the entire pawl lever 43 moves inward in the radial direction of the clutch against the spring force of the coil spring 46.

(Another Embodiment) The present invention has the self-adjuster 40 as described above.
It is not limited to the case where it is provided at only one location in the entire clutch, but it can also be provided at multiple locations.

(Effect of the invention) As explained above, in the self-adjuster of the pull type clutch according to the invention, a lever for transmitting a load is provided whose inner peripheral end is connected to the retainer connected to the release bearing, and the radial direction of this lever is In a so-called pull-type clutch, in which a substantially annular adjuster ring connected to the outer end of the clutch cover is threaded onto the inner surface of the clutch cover to adjust the wear allowance of the facings, when the facing F wears out, the clutch engages/releases the clutch. The sensing pin 45 can be guided around the pin 42 by the retainer 14 that moves in the axial direction, and the pawl lever 43 can be rotated around the pin 42 to rotate the ratchet internal teeth 55 in the direction of arrow B using the pawl 56. I can do it. Therefore, the azimuth ring 11 is facing F.
The position can be automatically adjusted in the direction of arrow A by the amount of wear.

The ratchet internal teeth 55 of the pawl lever 43 are engaged with the pawls 56 of the adjuster string 11, and the pawl lever 4
3, the adjuster string 11 can be rotated in the direction of arrow B (Fig. 2) by rotating in the direction of arrow R (Fig. 3), and when the pawl lever 43 rotates in the reverse R direction for clutch engagement, the pawl is rotated in the direction of arrow R (Fig. 3). The lever 43 can be moved against the spring force of the coil spring 46 so that the claw 56 rides over the tooth surface of the internal ratchet teeth 55, and the lever 43 is automatically adjusted by the friction force generated by the spring force of the spring member. The automatic adjustment operation is more reliable and smooth than the example above.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view showing an embodiment of the present invention;
The figures are a view taken in the direction of the arrows in FIG. 1, FIG. 3 is a view taken in the direction of the arrows in FIG. 10
...Clutch cover, 11...Asia string, 12...Diaphragm spring, 14...
Retainer, 16...Lever, 18...Pressure plate, 40...Self adjuster, 4
1...Steer bracket, 42...Pin, 43...
... Pawl lever, 44... Sensing arm, 45... Sensing pin, 46... Coil spring, 55... Ratchet internal teeth, 56... Pawl, F... Facing.

Claims (1)

[Scope of utility model registration request] In a clutch that uses a release lever connected to the clutch pedal to perform a tensile release operation to move the release bearing away from the flywheel, a lever for transmitting a load is provided whose inner peripheral end is connected to a retainer connected to the release bearing. A substantially annular adjuster string for adjusting the facing wear allowance connected to the radially outer end of the lever is screwed onto the inner surface of the clutch cover, and an opening is provided in a part of the clutch cover facing near the inner surface of the adjuster string. A stay bracket is fixed to the clutch cover, and has a bearing piece extending from the opening through the diaphragm spring to the vicinity of the inner surface of the adjuster string in the clutch axial direction, and the bearing piece is provided with a pin extending in the clutch radial direction. A pawl lever with a pawl at the tip that is rotatable in the center is provided, and between the large diameter part of the pin formed on the inward side in the circumferential direction of the clutch and the pawl lever, the pawl lever is inserted inward in the radial direction of the clutch. interposing a spring member that urges the pawl lever outward in the clutch radial direction by allowing movement of the pawl lever, and forming the pawl lever so that the pawl of the pawl lever fits into the ratchet tooth surface on the inner surface of the adjuster string; A sensing arm extending in the circumferential direction of the clutch is connected to the pawl lever, and the sensing arm is provided with a sensing pin extending inward in the radial direction of the clutch;
The tip of the sensing pin is fitted into a groove formed on the outer periphery of the retainer with a predetermined axial play, and the sensing pin is rotatably fitted around the pin along the groove. Self adjuster with pull type clutch.