JP3164427B2 - Multi-plate fastening element - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-plate fastening element which is applied to an automatic transmission or the like and has a wave spring interposed between adjacent plates as a drag torque preventing means when a clutch is released.

[0002]

2. Description of the Related Art Conventionally, as a multi-plate fastening element for an automatic transmission in which a wave spring is interposed between adjacent driven plates, for example, “Automobile Engineer, Novemb
er1965 ”on page 470 is known.

[0003] The above-mentioned conventional source shows a wave spring in which a wire is bent in a circular shape and formed in a waveform.

[0004]

However, according to the above prior art, the opening of the wave spring formed in a circular shape is a free end, and the load is lower than that of other wave peaks. In the case of a clutch or a brake that uses two or more wave springs, if the positions of the end portions do not match, as shown in FIG. There is a problem.

[0005] Further, since this wave spring is not positioned in the circumferential direction, as shown in FIG. 8, if the wave springs are assembled in such a manner that the load application points alternately appear on the front and back of one plate, the wave spring will not be positioned. If the thickness of the driven plate is small with respect to the load, the driven plate is deformed in a wave-like manner, causing a sliding resistance to the drive plate, which results in a problem that the drag torque is increased rather than prevented.

The present invention has been made in view of the above-mentioned problems, and is made of a wire that maintains a uniform plate interval between adjacent plates of the same type (for example, driven plates) with different types of plates interposed therebetween. A first object of the present invention is to surely prevent the drag torque when the clutch is released in the multi-plate fastening element in which the provided wave spring is interposed.

In addition to the above-mentioned first problem, a second object of the present invention is to reliably prevent drag torque when the clutch is released by simple assembly in the multi-plate fastening element.

[0008] In addition to the above-mentioned second problem, a third object is to prevent a wave spring from being erroneously assembled in a multi-plate fastening element.

[0009]

In order to solve the above-mentioned first problem, in the multiple disc fastening element according to the first aspect, the pitch of the end of the wave spring is made shorter than the pitch of the other load points.

That is, a plurality of drive plates are spline-coupled to one of the hub and the drum, and a plurality of driven plates are spline-coupled to the other, and a wave formed by a wire between at least one adjacent plate of the two plate groups. In the multi-plate fastening element in which the spring is interposed, the pitch at the end of the wave spring is shorter than the pitch at other load points.

In order to solve the second problem, in the multi-plate fastening element according to the second aspect, means for fitting a radial projection provided at a predetermined position of the wave spring into a groove for transmitting torque is provided. did.

That is, a plurality of drive plates are spline-coupled to one of the hub and the drum, and a plurality of driven plates are spline-coupled to the other, and a wave formed by a wire between at least one adjacent plate of the two plate groups. In the multi-plate fastening element with a spring interposed, the wave spring is provided with at least one or more projections in a radial direction at at least one or more predetermined positions with respect to a load application point acting on the plate. Is fitted in a groove for transmitting torque by fitting with a plate positioned by the wave spring.

In order to solve the third problem, in the multi-plate fastening element according to the third aspect, a second protrusion different from the protrusion is fitted into a second groove different from the groove. The width of the second protrusion is smaller than 1/2 of the width of the second groove, and the protrusion is offset to one of the centers of the second groove and extends in the axial direction.

That is, in the multi-plate fastening element according to claim 2, there is provided a second projection separate from the projection, and the second projection is fitted to a plate positioned by the wave spring and torque is reduced. And a second groove different from the groove among the grooves for transmitting the second protrusion, the width of the second protrusion is smaller than １ ／ of the second groove width, and
The second groove is deviated to one of the centers with respect to the center and extends in the axial direction.

[0015]

The operation of the first aspect of the present invention will be described.

At the time of fastening, the gap between the drive plate and the driven plate is shortened by the application of the fastening force, and the wave spring is elastically deformed in accordance with the shortened plate gap to make the gap between the plates zero. Are pressed in accordance with the magnitude of the fastening force, thereby fastening the multi-plate fastening element.

At the time of release, the restoring load of the wave spring pulls apart the adjacent plate by releasing the fastening force, and the interval between the adjacent plates is kept constant by the wave spring, so that the wave spring is arranged between the plates provided with the wave spring. By securing a predetermined gap with respect to the other plate, the multiple disc fastening element is released.

In the released state of the multi-plate fastening element, since the pitch of the end of the wave spring is shorter than the pitch of the other load points, the deformation of the end of the wave spring becomes large, and the opening of the wave spring opening becomes large. Since the load is the same as that of the other portions, the interval between the plates provided with the wave springs is kept uniform, and the occurrence of drag due to contact between adjacent plates is reliably prevented.

The operation of the second aspect of the present invention will be described.

At the time of assembling the multi-plate fastening element, the wave spring provided with at least one or more projections in the radial direction is moved by the wave spring at at least one or more predetermined positions with respect to the load acting point acting on the plate. Since it fits with the plate to be positioned and fits in the groove for transmitting torque, the openings of the wave spring with low load act, and when the multi-plate fastening element is fastened, opened or released, Exactly the same function as the first aspect is achieved.

Further, by assembling adjacent wave springs alternately in front, back, front, etc., the load application points of the wave springs coincide with each other, and even when the driven plate is thin, the driven plate can be deformed. There is no.

The operation of the third aspect will be described.

At the time of assembling the multi-plate fastening element, a second projection different from the projection is engaged with a plate positioned by a wave spring to transmit torque and is different from the groove. The second protrusion is fitted in the second groove, and the width of the second protrusion is smaller than １ ／ of the width of the second groove, and
The groove is deviated to either one of the centers of the grooves and extends in the axial direction, so that the rotation of the wave spring in the circumferential direction is restricted by the protrusion (the backlash is also reduced to a predetermined value or less), and the second Since the projections allow the adjacent wave springs to alternately turn over, the wave springs can be assembled without making any mistakes.

When the multi-plate fastening element is fastened, opened or released, the same operation as in the first aspect is achieved.

[0025]

Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) First, the configuration will be described.

FIG. 1 is a cross-sectional view showing a multi-plate clutch (an example of a multi-plate fastening element) for an automatic transmission according to a first embodiment, which corresponds to the first embodiment of the present invention. FIG. 3 is a side view showing an example of a wave spring, and FIG. 3 is a developed view showing a wave spring of the first embodiment.

As shown in FIG. 1, the multiple disc clutch of the first embodiment has a plurality of drive plates 2 on a clutch hub 1.
Are spline-coupled, a plurality of driven plates 4 are spline-coupled to the clutch drum 3, and a wave spring 51 is interposed between the driven plate 4 and the adjacent driven plate 4, which are alternately arranged. A clutch piston 6 is disposed at one end, and a retaining plate 7 is axially fixed to the other end by a snap ring 8.

Facings 9 and 10 are attached to the driven plate 4.

The wave spring 51 is formed in a circular shape as shown in FIG. 2, and its ends a and a 'are free ends. And this wave spring 51
The pitch L1 of the end portions ab and fa 'is shorter than the pitch L2 of the other load points b to f so that the same load is applied when assembled to the multiple disc clutch.

Next, the operation will be described.

(A) At the time of assembling the clutch At the time of assembling the clutch, the pitch L1 between the end portions ab and fa 'is interposed between the driven plates 4 and 4 in parallel with the spline connecting operation of the driven plate 4 and the drive plate 2 alternately. The work of interposing the wave spring 51 shorter than the pitch L2 of the other load points b to f is performed. Finally, the retaining plate 7 is spline-coupled, and the retaining plate 7 is not allowed to move by the snap ring 8. It is assembled by fixing as follows.

At the time of assembling the clutch, the wave width of the wave spring 51 is reduced from the free length to the set length, and an elastic restoring load accompanying the shortening is applied to the driven plate 4.

(B) At the time of operating the clutch At the time of operating the clutch, the gap between the drive plate 2 and the driven plate 4 is reduced by applying the fastening force from the clutch piston 6, and the wave spring 5 is operated.
1 is elastically deformed according to the shortening of the plate interval to make each plate interval zero, and then the two plates 2 and 4 are pressed against each other in accordance with the magnitude of the fastening force, whereby the multiple disc clutch is engaged.

When the clutch is released, the clutch piston 6
With the release of the fastening force from, the restoring load of the wave spring 51 separates the adjacent driven plates 4, 4, and the distance between the adjacent driven plates 4, 4 is kept constant by the wave spring 51, so that the driven plates 4, 4 are kept constant. By securing a predetermined gap with respect to the drive plate 2 arranged between the four, the multiple disc clutch is released.

(C) Drag torque reducing action When the multi-plate clutch is released, the wave spring 51
The distance between the driven plates 4 provided with the drive plates 2 is kept uniform, and the adjacent drive plate 2 and the driven plate 4
The occurrence of dragging due to the contact of the object is reliably prevented.

Next, the effects will be described.

(1) In a multi-plate clutch in which a wave spring 51 formed of a wire for maintaining a uniform plate interval between adjacent driven clutches 4 is provided, a pitch L1 between end portions ab and fa 'of the wave spring 51 is provided.
Is shorter than the pitch L2 of the other load points b to f, the amount of deformation at the end of the wave spring 51 becomes large, and the load at the end of the wave spring 51 becomes the same as the other parts. The spacing between the driven plates 4 provided with is kept uniform even in the circumferential direction, and it is possible to reliably prevent drag torque when the clutch is released.

(Second Embodiment) FIG. 4 is a front view showing a state in which a wave spring of a second embodiment corresponding to the second embodiment of the present invention is fitted to a clutch drum.

In the first embodiment, a wave spring 51 is provided.
The pitch L of the ends ab and fa '! To other load points b to f
In the second embodiment, the radial projection 11 provided at a predetermined position of the wave spring 52 is fitted into the groove 12 for transmitting torque. It differs from the first embodiment in that it is configured.

That is, as shown in FIG. 4, a protrusion 11 is provided in a radial direction at a predetermined position (end a in this embodiment) of the wave spring 52, and this protrusion 11 is connected to the spline groove (the above-mentioned " Groove for transmitting torque "
The wave spring 52 is positioned by fitting it into the 12). The projection 11 is provided at a position where the projection 11 fits into the spline groove 12 of the clutch drum 3 even when the wave spring 52 is turned upside down. Since the other configuration is the same as that of the first embodiment, illustration and description are omitted.

Operationally, the wave spring 52 is inserted into the spline groove 12 of the clutch drum 3 when the clutch is assembled.
The wave spring 52 is positioned and assembled to the multiple disc clutch by fitting the radially provided projection 11 to the end of the multi-plate clutch. The other operations are the same as those of the first embodiment.

Next, the effects will be described.

The following effect is added to the effect of the above (1).

(2) Spline groove 1 of clutch drum 3
Since the protrusion 11 provided in the radial direction is fitted to the end of the wave spring 52, the wave spring 52 is positioned and assembled to the multi-plate clutch. Acts, and the circumferential spacing of the driven plate 4 becomes uniform.

Further, the following effects are added. By assembling the adjacent wave springs 52 alternately with the front, back, front,..., The load application points of the wave springs 52 match, and even when the driven plate 4 is thin, the driven plate 4 is securely deformed. Thus, it is possible to prevent drag torque when the clutch is released.

(Third Embodiment) FIG. 5 (a) is a front view of a wave spring according to a third embodiment corresponding to the third embodiment of the present invention, and FIG. 5 (b) is a side view of the wave spring. FIG. 6A is a front view showing a state where the wave spring of the third embodiment is fitted to the clutch drum.
FIG. 6B is a side view showing a state in which the wave spring is arranged between adjacent driven plates, and FIG. 6C is a plan view showing a state in which the wave spring is arranged between adjacent driven plates.

The third embodiment is a modification of the second embodiment. As shown in FIG. 5A, the third embodiment is different from the projection 11 provided on the wave spring 52 of the second embodiment. As shown in FIG. 6A, the second protrusion 13 is a spline groove 14 which is a second groove different from the spline groove 12 of the clutch drum 3 of the second embodiment. The second protrusion 13 has a width equal to that of the second groove 1.
The fourth embodiment is different from the second embodiment in that the width is smaller than one half of the width of four widths, is deviated to one side with respect to the center of the second groove 14, and extends in the axial direction. FIG.
As shown in (b), a portion of the spline groove of the driven plate 4 which is in contact with the second projection 13 of the wave spring 53 is notched. Since the other configuration is the same as that of the first embodiment, illustration and description are omitted.

In operation, the rotation of the wave spring 53 in the circumferential direction is restricted by the protrusion 11 (the backlash is also reduced to a predetermined value or less), and the direction of the adjacent wave spring 53 is alternately changed by the second protrusion 13. , So that the wave spring 53 can be assembled without making a mistake. That is, the wave spring 5
At the time of assembling, if the directions of the adjacent wave springs 53 are the same, the second projections 13 interfere with each other and cannot be assembled. However, the directions are opposite as shown in FIGS. And the second protrusion 13 are assembled without interference. The other operations are the same as those of the first embodiment.

Next, the effects will be described.

The following effects are added to the effects (1) and (2).

(3) A second projection 13 different from the projection 11 provided at a predetermined position of the wave spring 53 in the radial direction.
The second protrusion 13 is fitted in a second groove 14 different from the spline groove 12 of the clutch drum 3, and the second protrusion 13 has a width equal to the width of the second groove 14. 1 /
2 and is offset in one direction with respect to the center of the second groove 14 and extends in the axial direction.
Can be alternately turned on the front and back, so the wave spring 53 is assembled without making any mistakes on the front and back,
The erroneous assembly of the wave spring 53 can be prevented.

Although the embodiment has been described with reference to the drawings, the specific configuration is not limited to the embodiment, and any changes or additions without departing from the gist of the present invention are included in the present invention. It is.

For example, in the embodiment, an example in which the present invention is applied to a multi-plate clutch of an automatic transmission has been described, but the present invention can also be applied to a multi-plate brake and the like.

The wave spring of the first embodiment may be provided with the projection of the second embodiment. In this case, if the projection is aligned and the front and the back are alternately assembled, the front and the back of the driven plate can be obtained. Load points coincide.

[0056]

According to the first aspect of the present invention, in a multi-plate fastening element in which a wave spring formed by a wire is interposed between adjacent plates, the pitch of the end of the wave spring is changed to another. Since it is shorter than the pitch of the load points, variations in the load in the circumferential direction can be suppressed, the intervals in the circumferential direction become uniform, and the effect of reliably preventing drag torque when the clutch is released can be obtained.

According to the second aspect of the present invention, in a multi-plate fastening element in which a wave spring formed of a wire is interposed between adjacent plates, a radial direction provided at a predetermined position of the wave spring is provided. The projections are fitted in the grooves for transmitting torque, so that the low-load position can be matched by simple assembly, so the circumferential spacing is uniform and the drag torque is reliably prevented when the clutch is released. Is obtained.

Furthermore, even if the plate thickness on the side on which the load of the wave spring acts is thin relative to the load, the adjacent wave springs are alternately turned upside down,
By assembling with the table, it is possible to prevent the plate from being deformed, and it is possible to obtain the effect that the assembling can reliably prevent the drag torque when the clutch is released.

According to the third aspect of the present invention, in the multi-plate fastening element in which a wave spring formed by a wire is interposed between adjacent plates, a second projection different from the projection is provided. The second protrusion is fitted in a second groove different from the groove among the grooves for transmitting torque by fitting with the plate positioned by the wave spring. The width of the projection is the second
Is smaller than 1/2 of the width of the groove, and is offset toward one of the centers of the second grooves, and extends in the axial direction. The effect that the load points can be surely matched is obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a multiple disc clutch of an automatic transmission according to a first embodiment of the present invention.

FIG. 2 is a side view showing the wave spring according to the first embodiment of the present invention.

FIG. 3 is a development view showing a wave spring according to the first embodiment of the present invention.

FIG. 4 is a front view showing a state where a wave spring according to a second embodiment of the present invention is fitted to a clutch drum.

FIG. 5A is a front view of a wave spring according to a third embodiment of the present invention, and FIG. 5B is a side view of the wave spring.

FIG. 6A is a front view showing a state in which the wave spring according to the third embodiment of the present invention is fitted to a clutch drum;
(B) is a side view showing a state where the wave spring is arranged between adjacent driven plates, and (C) is a plan view showing a state where the wave spring is arranged between adjacent driven plates.

FIG. 7 is an explanatory view showing a driven plate state in the case where the end load of the wave spring is low in the conventional multi-plate clutch having the wave spring.

FIG. 8 is an explanatory view showing a driven plate deformation state in a case where the load application point of the wave spring does not match when the thickness of the driven plate is thin with respect to the spring load in the conventional multi-plate clutch having a wave spring. It is.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Clutch hub 2 Drive plate 3 Clutch drum 4 Driven plate 51, 52, 53 Wave spring 6 Clutch pin 7 Retaining plate 8 Snap ring 9 Fading 10 Fading 11 Projection 12 Spline groove 13 Second projection 14 Spline groove

──────────────────────────────────────────────────続 き Continuation of the front page Examiner Ken Isobe (56) References JP 5-187458 (JP, A) JP 5-288227 (JP, A) JP 5-141435 (JP, A) 60-184720 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16D 11/00-23/14 F16D 25/06-25/12

Claims (3)

(57) [Claims] A plurality of drive plates are spline-coupled to one of a hub and a drum, and a plurality of driven plates are spline-coupled to the other, and a wave formed by a wire between at least one adjacent plate of two plate groups. A multi-plate fastening element in which a spring is interposed, wherein a pitch of an end portion of the wave spring is shorter than a pitch of another load point. 2. A plurality of drive plates are spline-coupled to one of the hub and the drum, and a plurality of driven plates are spline-coupled to the other, and a wave formed by a wire between at least one adjacent plate of the two plate groups. A multi-plate fastening element having a spring interposed therein, wherein the wave spring is provided with at least one or more projections in a radial direction at at least one or more predetermined positions with respect to a load application point acting on the plate; Is fitted in a groove for transmitting torque by fitting with a plate positioned by the wave spring. 3. The multi-plate fastening element according to claim 2, further comprising a second projection different from said projection, wherein said second projection is fitted to a plate positioned by said wave spring and torque is applied. Of the second projection is fitted into a second groove different from the groove, and the width of the second projection is one of the width of the second groove.
A multi-plate fastening element characterized by being narrower than // 2, offset to one side with respect to the center of the second groove, and extending in the axial direction.