JP3696664B2 - Multi-plate clutch structure - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a wet multi-plate clutch structure for an automatic transmission.
[0002]
[Prior art]
A conventional multi-plate clutch structure will be described below.
[0003]
As shown in FIG. 9, in the conventional multi-plate clutch structure, the drive plate 5 that engages with the spline 4a of the hub 4 and the driven plate 6 that engages with the spline 2a of the drum 2 are alternately overlapped in the cylindrical drum 2. And a piston 7 that operates on one end side of the drive plate 5 and the driven plate 6 in the drum 2 and a snap that is located on the other end side to prevent the plates 5 and 6 from escaping. A ring 8 is configured to be fitted through a retaining plate 9. The retaining plate 9, the drive plate 5, and the driven plate 6 form a friction plate 10.
[0004]
In the multi-plate clutch structure 1 as described above, the piston 7 is moved in the direction of pressing the friction plate 10 against the return spring (not shown) by the hydraulic pressure supplied to the back side thereof. In addition, the retaining plate 9 and the driven plate 6 rotate together with the drum 2, and the drive plate 5 rotates together with the hub 4, which rotate at different speeds. , 6 are gradually tightened while being frictioned with each other, the drum 2 and the hub 4 rotate at the same speed, and the rotational force of the hub 4 is transmitted.
[0005]
During the rotation of the drum 2 and the hub 4 at different speeds, oil is supplied from the shaft core through the oil passage, and is supplied to the friction plate 10 from the hole 4b formed in the hub 4 by centrifugal force. 10 lubrication and cooling are performed.
[0006]
[Problems to be solved by the invention]
However, in the above-described conventional configuration, in order to ensure the workability of the set of the snap ring 8, the plate width of the snap ring 8 cannot be increased or the plate thickness cannot be increased. Further, as shown in FIG. Since the terminal 8a is cut, the ring 8 may be deformed by a force when the piston 7 is operated. Further, since the force point (point F) during operation of the piston 7 and the fulcrum (point A) of the snap ring are offset, the snap ring 8 and the retaining plate 9 are deformed as shown in FIG. I will wake you up.
[0007]
At this time, the contact point (point A) between the snap ring 8 and the drum 2 and the contact point (point B) between the snap ring 8 and the retaining plate 9 are in the contact position as shown in FIG. The facing 5a of the plate 5 is located only on the outside of the driven plate 6 and has a problem that clutch burn is likely to occur.
[0008]
SUMMARY OF THE INVENTION An object of the present invention is to solve the above-described conventional problems, and to provide a multi-plate clutch structure that maintains a uniform pressure distribution between a drive plate and a driven plate and prevents the occurrence of clutch burn.
[0009]
[Means for Solving the Problems]
In order to achieve this object, the multi-plate clutch structure of the present invention includes a piston that is movable in the axial direction on the bottom surface side in the drum, a retaining plate on the opening side in the drum, and the piston and the A plurality of drive plates that engage with the splines of the drive hub and a plurality of driven plates that engage with the splines of the drum are alternately overlapped and fitted between the retaining plates, and the drive plates are moved by the movement of the pistons. In the multi-plate clutch structure in which the torque of the hub is transmitted to the drum side by fastening the driven plate and the driven plate, the drum inner surface is continuous with the spline and on the circumference of the retaining plate in the torque transmission direction. A fitting groove is cut in the fitting groove, and the external teeth of the retaining plate are fitted into the fitting groove to prevent it from being removed. It has a configuration.
[0010]
Further, the multi-plate clutch structure of the present invention has a configuration in which a stop pin for fixing the retaining plate is fitted into the spline of the drum.
[0011]
Furthermore, the multi-plate clutch structure of the present invention has a configuration in which a step is provided in the fitting groove that is fitted to the external teeth of the retaining plate.
[0012]
[Action]
With this configuration, the external teeth of the retaining plate are fitted in the fitting groove on the drum inner surface, so that the pressure distribution on the friction surface between the drive plate and the driven plate is kept uniform by the rigidity of the retaining plate, and the clutch burns. Is prevented from occurring.
[0013]
Further, the retaining plate is firmly fixed by the structure in which the stop pin for fixing the retaining plate is fitted to the spline of the drum.
[0014]
In addition, the structure in which the step is provided in the fitting groove that fits the external teeth of the retaining plate allows the external teeth to fit into the step when the external teeth are rotated in the torque transmission direction, eliminating the need for a locking pin. Yes, the work process can be shortened and the cost is reduced.
[0015]
【Example】
An embodiment of the present invention will be described below with reference to the drawings.
[0016]
As shown in FIG. 1, the multi-plate clutch structure 11 of the automatic transmission includes a drive hub 14 that is driven by a rotary shaft 27 and a friction plate 20 that transmits the rotational force of the hub 14 to the drum 12. That is, a drive plate 16 that engages with the spline 15 of the hub 14 and a driven plate 17 that engages with the spline 13 of the drum 12 are alternately overlapped and fitted in the cylindrical drum 12. A piston 18 that operates on the drive plate 16 and the driven plate 17 and a retaining plate 19 for preventing the plates 16 and 17 from escaping are fitted.
[0017]
The retaining plate 19 also serves as a snap ring. As shown in FIGS. 2 to 6, a fitting groove 23 that fits the outer teeth 22 of the retaining plate 19 is connected to the spline 13 on the inner surface of the drum 12. It is formed in the transmission direction (arrow direction). When the external teeth 22 of the retaining plate 19 are fitted to the spline 13 and rotated slightly in the torque transmission direction, the external teeth 22 are fitted in the fitting grooves 23 and the retaining plate 19 is fixed to the drum 12. It is like that. Further, in order to make it easy for the external teeth 22 of the retaining plate 19 to enter the fitting groove 23, the corner R of the drum fitting groove 23 is made large, and the groove width is a dimension slightly increased with respect to the thickness of the external teeth. It is easy to enter and eliminates play.
[0018]
Further, although the torque is hardly applied on the opposite side in the torque transmission direction, the retaining plate 19 is firmly fixed by inserting the 1 to 3 stop pins 24 into the spline 13 of the drum 12. The shape of the retaining pin 24 may be a plug-in type as shown in FIGS. 3 and 4, or may be a pinch type as shown in FIGS.
[0019]
Further, the piston 18 moves in a direction in which the drive plate 16 and the driven plate 17 are pressed against the return spring 21 by the hydraulic pressure supplied to the back side, and acts to fasten the plates 16 and 17.
[0020]
In the multi-plate clutch structure 11 configured as described above, the retaining plate 19 and the driven plate 17 rotate together with the drum 12, and the drive plate 16 rotates together with the hub 14, and these rotate at different speeds. However, when the hydraulic pressure is applied to the piston 18 and the plates 16 and 17 are pressed, they are fastened with friction and the drum 12 and the hub 14 rotate at the same speed, and the rotational force of the hub 14 is applied to the drum 12. Communicated.
[0021]
At this time, as shown in FIG. 7, the external teeth 22 of the retaining plate 19 are fitted in the fitting grooves 23 on the inner surface of the drum, and are held on the drum 12 at the fulcrums X and Y points against the pressing force of the piston 18. Has been. Further, since the retaining plate 19 has rigidity, the friction surface pressure distribution between the drive plate 16 and the driven plate 17 is kept uniform, thereby preventing the occurrence of clutch burn.
[0022]
Further, by eliminating the snap ring with a cut end, a small plate width and a small rigidity, the clutch length can be shortened, space can be saved and the cost can be reduced. Also, the weight is reduced and the rotational (loss) energy is somewhat reduced.
[0023]
Further, as shown in FIG. 8, by forming a step 25 in the fitting groove 23 in which the external teeth 22 of the retaining plate 19 are fitted, the external teeth 22 are stepped when the external teeth 22 are slightly rotated in the torque transmission direction. 25, it is not necessary to use a detent pin, the work process can be shortened, and the cost can be reduced.
[0024]
【The invention's effect】
As described above, the present invention includes a piston that is movable in the axial direction on the bottom surface side in the drum, a retaining plate on the opening side in the drum, and a drive hub between the piston and the retaining plate. A plurality of drive plates that mesh with the splines of the drum and a plurality of driven plates that mesh with the splines of the drum are alternately overlapped and fitted, and the drive plate and the driven plate are fastened by movement of the piston In the multi-plate clutch structure configured to transmit the torque of the hub to the drum side, a fitting groove is formed on the inner surface of the drum so as to be continuous with the spline and on the circumference in the torque transmission direction of the retaining plate, By retaining the retaining plate by fitting the external teeth of the retaining plate into the fitting groove, the retaining plate Since the external teeth fit into the fitting groove on the drum inner surface, the rigidity of the retaining plate keeps the friction surface pressure distribution between the drive plate and driven plate uniform, preventing the occurrence of clutch burning and snapping. Since the ring is abolished, a space equivalent to the installation space of this snap ring is formed on the drum side, and it is possible to make the thickness of the retaining plate thicker by using a part of this space Thus, even with this small change in plate thickness, it is possible to realize an excellent multi-plate clutch structure that greatly increases the rigidity of the retaining plate corresponding to the cube of the plate thickness.
[0025]
Further, the retaining plate is firmly fixed by inserting a retaining pin for fixing the retaining plate into the spline of the drum.
[0026]
Further, by forming a step in the fitting groove into which the external teeth of the retaining plate are fitted, the external teeth are fitted into the step when the external teeth are rotated in the torque transmission direction. It is not necessary, the work process can be shortened, and the cost is reduced.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a multi-plate clutch structure in one embodiment of the present invention.
FIG. 2 is a perspective view of a retaining plate fitted to the drum.
FIG. 3 is a perspective view of a retaining plate fitted with a locking pin.
4A is a cross-sectional view taken along line AA in FIG. (B) It is sectional drawing which follows the BB line of FIG.
FIG. 5 is a perspective view of a retaining plate fitted with another stop pin.
6A is a cross-sectional view taken along the line CC in FIG.
(B) It is a side view of the D arrow direction of FIG.
FIG. 7 is an enlarged cross-sectional view of a main part of the multi-plate clutch structure.
FIG. 8 is a sectional view of another retaining plate fitting groove.
FIG. 9 is a cross-sectional view of a main part of a conventional multi-plate clutch structure.
FIG. 10 is an enlarged sectional view of the same part.
FIG. 11 is a partial plan view of the snap ring.
[Explanation of symbols]
11 Multi-plate clutch structure 12 Drum 13 Spline 14 Hub 16 Drive plate 17 Driven plate 18 Piston 19 Retaining plate 22 External teeth 23 Fitting groove

Claims (3)

A piston that can move in the axial direction is provided on the bottom side of the drum, and a retaining plate that has external teeth on the opening side in the drum, and is engaged with the spline of the drive hub between the piston and the retaining plate. A plurality of drive plates and a plurality of driven plates meshing with the splines of the drum are alternately overlapped and fitted, and the drive plate and the driven plate are fastened by the movement of the piston to thereby torque the hub In the multi-plate clutch structure that transmits the drum to the drum side, a fitting groove is formed on the inner surface of the drum so as to be continuous with the spline and on the circumference in the torque transmission direction of the retaining plate. A multi-plate clutch structure characterized in that an external tooth of the retaining plate is fitted into a groove to prevent it from being removed. The multi-plate clutch structure according to claim 1, wherein a stop pin for fixing the retaining plate is fitted into the spline of the drum. The multi-plate clutch structure according to claim 1, wherein a step is provided in the fitting groove that is fitted to an external tooth of the retaining plate.

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