JP6578231B2 - Clutch device - Google Patents

Description

  The present invention relates to a clutch device including a hydraulic chamber that operates a piston.

  Conventionally, the outer plate fixed to rotate integrally with the outer drum and the inner disk fixed to rotate integrally with the inner hub are pressed in the direction of the rotation axis with a piston to generate a frictional force. A clutch device that rotates a drum and an inner hub integrally is known (see, for example, Patent Document 1).

  In this type of clutch device, the piston is pressed by supplying hydraulic pressure to the hydraulic chamber.

JP-A-8-112498

  Some hydraulic chambers of the clutch device are defined using hydraulic chamber plates. There is also a clutch device in which a hub plate that supports an outer drum or the like of the clutch device via a bearing is provided adjacently. By separating the hydraulic chamber plate and the hub plate in this way, it is difficult for external force to be applied to the hydraulic chamber plate, preventing backlash due to processing tolerances of the hydraulic chamber plate due to external force, and the outer plate and inner disk. Fluctuation in clearance (clutch clearance) with the piston is prevented.

  However, although the fluctuation of the clutch clearance can be prevented, there is a problem that the clutch device becomes large because the hydraulic chamber plate and the hub plate are arranged separately.

  In view of the above, it is an object of the present invention to provide a clutch device that can prevent fluctuations in clutch clearance and can be downsized.

In order to achieve the above object, the clutch device of the present invention (for example, the clutch device 1 of the embodiment, hereinafter the same) is provided.
An outer drum (for example, the outer drum 4 of the embodiment; the same applies hereinafter);
An inner hub (for example, the inner hub 3 of the embodiment; the same shall apply hereinafter);
A shaft that supports the inner hub (for example, the shaft 3 of the embodiment; the same applies hereinafter);
A plurality of friction plates disposed between the outer drum and the inner hub (for example, the inner disk 5 and the outer plate 6 of the embodiment; the same applies hereinafter);
A piston that can press the friction plate freely (for example, the piston 7 in the embodiment; the same applies hereinafter);
A hydraulic chamber plate (for example, the hydraulic chamber plate 8 of the embodiment; the same applies hereinafter) that defines a hydraulic chamber (for example, the hydraulic chamber 7a of the embodiment; the same applies hereinafter) with the piston;
With
The hydraulic chamber plate supports the outer drum,
A radially inner end of the hydraulic chamber plate has a step provided on the shaft (for example, step 2a of the embodiment; the same applies hereinafter) and a wedge member (for example, the taper clip 10 of the embodiment; the same applies hereinafter). ) And is fixed so as not to move in the direction of the rotation axis.

  According to the clutch device of the present invention, since the hydraulic chamber plate is sandwiched between the stepped portion of the shaft and the wedge member, the hydraulic chamber plate does not rattle even when an external force is applied from the outer drum. Therefore, according to the present invention, it is possible to prevent the clutch clearance from changing and to reduce the size of the clutch device.

Explanatory drawing which shows embodiment of the clutch apparatus of this invention. Explanatory drawing which shows the clutch apparatus of the conventional structure as a comparative example.

  A clutch device 1 according to an embodiment of the present invention will be described with reference to FIG. The clutch device 1 of the present embodiment includes an inner hub 3 that is fixed to the shaft 2 and a cylindrical outer drum 4 that is disposed on the radially outer side of the inner hub 3 with a space therebetween.

  A plurality of inner disks 5 are arranged on the outer peripheral surface of the inner hub 3 along the rotation axis direction. On the outer peripheral surface of the inner hub 3, a plurality of sliding grooves 3 a that rotate integrally with the inner disk 5 and guide the sliding in the rotation axis direction are provided at intervals in the circumferential direction. A plurality of projecting pieces 5 a that fit into the sliding grooves 3 a are provided on the radially inner edge of the inner disk 5 in correspondence with the sliding grooves 3 a.

  A plurality of outer plates 6 are arranged on the inner peripheral surface of the outer drum 4 so as to be sandwiched between the inner disks 5 along the rotation axis direction. On the outer peripheral surface of the outer drum 4, a plurality of sliding grooves 4 a that rotate integrally with the outer plate 6 and guide the sliding in the direction of the rotation axis are provided at intervals in the circumferential direction. A plurality of projecting pieces 6a that fit into the sliding grooves 4a are provided on the outer edge of the outer plate 6 in the radial direction, corresponding to the sliding grooves 4a.

  In addition, the clutch device 1 defines a hydraulic chamber 7 a between the piston 7 that presses the inner disk 5 positioned at the end in the rotation axis direction and frictionally engages the inner disk 5 and the outer plate 6, and the piston 7. And a hydraulic chamber plate 8 for forming.

  The piston 7 presses the inner disk 5 positioned at the end in the rotation axis direction when the hydraulic pressure is supplied to the hydraulic chamber 7a, and is positioned at the end in the rotation axis direction when the hydraulic pressure to the hydraulic chamber 7a is released. The pressure on the inner disk 5 is released.

  The outer drum 4 is provided with a side wall portion 4b extending radially inward from an end portion in the rotation axis direction. The side wall portion 4b is supported by the hydraulic chamber plate 8 so as to abut against the hydraulic chamber plate 8 via the thrust bearing 9 and prevent movement toward the inner hub 3 in the rotation axis direction.

  Here, when an external force is applied from the outer drum 4 to the hydraulic chamber plate 8 via the thrust bearing 9, if the position of the hydraulic chamber plate 8 is displaced by the applied external force, the hydraulic chamber plate 8 is moved to the hydraulic chamber. Since this is a member that defines 7a, the volume in the hydraulic chamber 7a varies, and the interval (clutch clearance) between the inner disk 5 located at the end in the rotational axis direction and the piston 7 also varies, There is a possibility that an appropriate clutch clearance cannot be maintained.

  Therefore, in the conventional clutch device, the hydraulic chamber plate 8 does not support the side wall portion 4b of the outer drum 4, and a hub plate separate from the hydraulic chamber plate 8 is provided, and the side wall portion 4b is provided by this hub plate. Was supporting. However, in this case, since it is necessary to separately provide a hub plate, there is a problem that the conventional clutch device cannot be downsized.

  In the clutch device 1 of the present embodiment, a step portion 2a is provided by providing the shaft 2 with a diameter-expanding portion 2b that expands in the radial direction, and the inside of the hydraulic chamber plate 8 in the radial direction is provided between the step portion 2a. By fixing the taper clip 10 to the shaft 2 so as to sandwich the end portion of the hydraulic chamber plate, displacement of the hydraulic chamber plate 8 is prevented.

  As a result, even if an external force from the outer drum 4 is transmitted to the hydraulic chamber plate 8 via the thrust bearing 9, the hydraulic chamber plate 8 is not rattled and the volume of the hydraulic chamber 7a is prevented from changing, and the clutch clearance Can be maintained appropriately.

  FIG. 2 shows a clutch device 1 'having a conventional structure as a comparative example. The clutch device 1 'of the comparative example is a hub plate separate from the hydraulic chamber plate 8 without supporting the side wall 4b of the outer drum 4 with the hydraulic chamber plate 8 fixed to the shaft 2 by the snap ring 8a. 11 is provided on the shaft 2, and the side wall 4 b is supported by the hub plate 11. However, in this case, since it is necessary to separately provide the hub plate 11 in addition to the hydraulic chamber plate 8, an increase in the size of the clutch device 1 'cannot be avoided.

DESCRIPTION OF SYMBOLS 1 Clutch apparatus 2 Shaft 2a Step part 2b Expanded diameter part 3 Inner hub 3a Sliding groove 4 Outer drum 4a Sliding groove 4b Side wall part 5 Inner disk 5a Projection piece 6 Outer plate 6a Projection piece 7 Piston 7a Hydraulic chamber 8 For hydraulic chamber Plate 8a Snap ring 9 Thrust bearing 10 Taper clip 11 Hub plate

Claims (1)

An outer drum,
An inner hub,
A shaft that supports the inner hub;
A plurality of friction plates disposed between the outer drum and the inner hub;
A piston that can press the friction plate freely;
A hydraulic chamber plate defining a hydraulic chamber with the piston;
With
The hydraulic chamber plate supports the outer drum,
A clutch device characterized in that a radially inner end portion of the hydraulic chamber plate is sandwiched between a step portion provided on the shaft and a wedge member and is immovably fixed in the rotation axis direction.