Power transmission device

Patent metadata

Field	Value
Publication number	US-11661981-B2
Application number	US-202217860341-A
Country	US
Kind code	B2
Filing date	Jul 8, 2022
Priority date	Dec 5, 2018
Publication date	May 30, 2023
Grant date	May 30, 2023

Abstract

A power transmission device has a first pressure member ( 5 a ), a second pressure member ( 5 b ) and a back-torque transmitting cam. The first pressure member ( 5 a ) presses the drive-side clutch plates ( 6 ) and the driven-side clutch plates ( 7 ) against each other. The second pressure member ( 5 b ) releases a press-contact force between the drive-side clutch plates ( 6 ) and the driven-side clutch plates ( 7 ). The back-torque transmitting cam moves the second pressure member ( 5 b ) relative to the first pressure member ( 5 a ) to keep pressing the drive-side clutch plates ( 6 ) and the driven-side clutch plates ( 7 ) against each other when a rotational force is input to the clutch member ( 4 ), via the output shaft ( 3 ), in a process where the weight member ( 8 ) moves from the radially-outer position to the radially-inner position and the first pressure member ( 5 a ) moves to follow the interlocking member ( 9 ).

First claim

What is claimed is:

1. A power transmission device comprising:
a clutch member housed in a clutch housing that rotates together with an input member rotated by engine driving power of a vehicle and the clutch housing including a plurality of drive-side clutch plates, the clutch member including a plurality of driven-side clutch plates alternately positioned with the drive-side clutch plates of the clutch housing and coupled to an output member rotating a wheel of the vehicle;
a pressure member movable between an active position and an inactive position, in the active position, the pressure member presses the drive-side clutch plates and the driven-side clutch plates against each other to be able to transmit the engine driving power to the wheel and in the inactive position the pressure member releases a press-contact force between the drive-side clutch plates and the driven-side clutch plates to be able to stop transmitting the engine driving power to the wheel;
a weight member movable from a radially-inner position to a radially-outer position due to a centrifugal force generated by the rotating clutch housing;
an interlocking member moving the pressure member from the inactive position to the active position as the weight member moves from the radially-inner position to the radially-outer position;
an activation member moving the pressure member in a direction such that a press-contact force between the drive-side clutch plates and the driven-side clutch plates is enabled to be released;
the pressure member further comprising:
a first pressure member moving in a direction such that the first pressure member presses the drive-side clutch plates and the driven-side clutch plates against each other by receiving a pressing force of the interlocking member,
a second pressure member moving in a direction such that the second pressure member releases a press-contact force between the drive-side clutch plates and the driven-side clutch plates by receiving an activation force of the activation member,
a back-torque transmitting cam configured to move the second pressure member relative to the first pressure member in a direction such that the drive-side clutch plates and the driven-side clutch plates are pressed against each other to keep pressing the drive-side clutch plates and the driven-side clutch plates against each other when a rotational force is input to the clutch member via the output member and the first pressure member follows the interlocking member and moves in a released direction, and the back-torque transmitting cam includes cam surfaces in mating surfaces of the first pressure member and the second pressure member, and due to the function of the cam surfaces, it is possible to move the second pressure member in the direction to press the clutch plates when the back torque is generated from the output.

2. The power transmission device according to claim 1 , wherein a movement direction where the second pressure member is moved by the back-torque transmitting cam and a movement direction where the second pressure member is moved by activation of the activation member are opposite to each other.

3. The power transmission device according to claim 2 , wherein the back torque transmitting cam is formed in an outer peripheral edge part of each of the first pressure member and the second pressure member.

4. The power transmission device according to claim 1 , wherein the back torque transmitting cam is formed in an outer peripheral edge part of each of the first pressure member and the second pressure member.

5. The power transmission device according to claim 4 , wherein the drive-side clutch plate is substantially annular, and a radially-outer end of the back torque transmitting cam is located radially outside a radially-inner end of the drive-side clutch plate.

6. The power transmission device according to claim 4 , wherein the drive-side clutch plate is formed in a substantially annular shape, and a radially-outer end of the back-torque transmitting cam is located radially outside a radially-inner end of the drive-side clutch plate.

7. The power transmission device according to claim 1 , wherein the back torque transmitting cam moves the second pressure member by pressing a slide area of the second pressure member over which the drive-side clutch plates and the driven-side clutch plates slide.

8. The power transmission device according to claim 1 , further comprising:
a release spring holding the pressure member at the inactive position, the release spring is compressed as the interlocking member moves and the pressure member moves from the inactive position toward the active position, and the release spring applying an urging force while enabling movements of the interlocking member and the pressure member until the drive-side clutch plates and the driven-side clutch plates reach an engaged state before the drive-side clutch plates and the driven-side clutch plates are pressed against each other;
a clutch spring is configured to be compressed in a process where the interlocking member moves after the drive-side clutch plates and driven-side clutch plates have reached the engaged state and the clutch spring applies a press-contact force between the drive-side clutch plates and the driven-side clutch plates enabling movement of the interlocking member; and
a cushioning member interposed between the first pressure member and the second pressure member, the cushioning member configured to, by being compressed, apply an urging force while enabling movement of the interlocking member in a process where the interlocking member moves and the pressure member moves from the inactive position toward the active position.

9. The power transmission device according to claim 8 , wherein the cushioning member is a wave spring including a C-shaped member with a cutout portion in a part of an annular shape, and the back-torque transmitting cam supports an outer peripheral surface of the wave spring.

10. The power transmission device according to claim 1 , further comprising a torque transmitting portion, formed in each of the first pressure member and the second pressure member, transmitting a rotational force, that has been transmitted to the second pressure member, to the first pressure member without using the back-torque transmitting cam.

11. A power transmission device comprising:
a clutch member housed in a clutch housing that rotates together with an input member rotated by engine driving power of a vehicle and the clutch housing including a plurality of drive-side clutch plates, the clutch member including a plurality of driven-side clutch plates alternately positioned with the drive-side clutch plates of the clutch housing and coupled to an output member rotating a wheel of the vehicle;
a pressure member movable between an active position and an inactive position, in the active position, the pressure member presses the drive-side clutch plates and the driven-side clutch plates against each other to be able to transmit the engine driving power to the wheel and in the inactive position the pressure member releases a press-contact force between the drive-side clutch plates and the driven-side clutch plates to be able to stop transmitting the engine driving power to the wheel;
a weight member movable from a radially-inner position to a radially-outer position due to a centrifugal force generated by the rotating clutch housing;
an interlocking member moving the pressure member from the inactive position to the active position as the weight member moves from the radially-inner position to the radially-outer position;
an activation member moving the pressure member in a direction such that a press-co

Assignees

• Fcc Kk

Inventors

• Ozawa Yoshihiko
• Chen Han Hiong
• Yoshimoto Katsu

Classifications

• F16D43/12 Primary

  the centrifugal masses acting on, or forming a part of, an actuating mechanism by which the pressure ring can also be actuated independently of the masses · CPC title

• F16D13/52

  Clutches with multiple lamellae {; Clutches in which three or more axially moveable members are fixed alternately to the shafts to be coupled and are pressed from one side towards an axially-located member (F16D13/385 takes precedence)} · CPC title

• F16D67/02

  Clutch-brake combinations · CPC title

• B60K17/02

  characterised by arrangement, location, or kind of clutch · CPC title

• F16D43/206

  moving axially between engagement and disengagement · CPC title