Power transmission device

Patent metadata

Field	Value
Publication number	US-11543002-B2
Application number	US-201916283127-A
Country	US
Kind code	B2
Filing date	Feb 22, 2019
Priority date	Mar 19, 2018
Publication date	Jan 3, 2023
Grant date	Jan 3, 2023

Abstract

A power transmission device includes an input rotary member, an intermediate rotary member, an output rotary member, a friction engaging part and a load adjusting mechanism. A torque is inputted to the input rotary member. The torque is inputted from the input rotary member to the intermediate rotary member. The torque is outputted from the output rotary member. The friction engaging part is engaged by friction with a friction force depending on a load applied thereto. The friction engaging part is configured to transmit the torque between the intermediate rotary member and the output rotary member. The load adjusting mechanism is configured to adjust the load applied to the friction engaging part in accordance with the torque inputted to the input rotary member.

First claim

What is claimed is:

1. A power transmission device comprising:
an input rotary member to which a torque is inputted;
an intermediate rotary member to which the torque is inputted from the input rotary member, the intermediate rotary member being movable in an axial direction;
an output rotary member from which the torque is outputted;
a friction engaging part engaged by friction with a friction force depending on a load applied thereto, the friction engaging part configured to transmit the torque between the intermediate rotary member and the output rotary member;
a load adjusting mechanism configured to adjust the load applied to the friction engaging part in accordance with the torque inputted to the input rotary member, the load adjusting mechanism disposed axially between the input rotary member and the intermediate rotary member; and
a first elastic member configured to elastically couple the input rotary member and the intermediate rotary member in a circumferential direction,
the intermediate rotary member being rotatable relative to the input rotary member and the output rotary member.

2. The power transmission device according to claim 1 , wherein
the load adjusting mechanism is further configured to reduce the load applied to the friction engaging part when the torque inputted to the input rotary member has a predetermined magnitude or greater.

3. The power transmission device according to claim 1 ,
wherein
the load adjusting mechanism is further configured to adjust the load applied to the friction engaging part in accordance with a torsion angle between the input rotary member and the intermediate rotary member.

4. The power transmission device according to claim 3 , wherein
the load adjusting mechanism includes a cam mechanism, the cam mechanism configured to reduce the load applied to the friction engaging part when the torsion angle becomes predetermined degrees or greater.

5. The power transmission device according to claim 4 , wherein
the load adjusting mechanism includes a pressing member, the pressing member configured to press the intermediate rotary member in the axial direction so as to apply the load to the friction engaging part, the pressing member unitarily rotated with the intermediate rotary member, and
the cam mechanism is configured to move the pressing member in the axial direction when the torsion angle becomes the predetermined degrees or greater.

6. The power transmission device according to claim 5 , wherein
the load adjusting mechanism further includes a second elastic member disposed between the pressing member and the intermediate rotary member, and
the pressing member is configured to press the intermediate rotary member through the second elastic member.

7. The power transmission device according to claim 1 , wherein
the friction engaging part includes a first friction plate and a second friction plate, the first friction plate unitarily rotated with the intermediate rotary member, the second friction plate unitarily rotated with the output rotary member.

8. The power transmission device according to claim 7 , wherein
the first friction plate and the second friction plate make contact with each other at surfaces thereof each having a conical shape.

9. The power transmission device according to claim 7 , wherein
the first friction plate and the second friction plate make contact with each other at surfaces thereof each extending in a circumferentially wavy shape.

10. A power transmission device comprising:
an input rotary member to which a torque is inputted;
an intermediate rotary member to which the torque is inputted from the input rotary member, the intermediate rotary member being movable in an axial direction;
an output rotary member from which the torque is outputted;
a friction engaging part engaged by friction with a friction force depending on a load applied thereto, the friction engaging part configured to transmit the torque between the intermediate rotary member and the output rotary member;
a load adjusting mechanism configured to adjust the load applied to the friction engaging part in accordance with the torque inputted to the input rotary member, the load adjusting mechanism including a cam part formed on the input rotary member; and
a first elastic member configured to elastically couple the input rotary member and the intermediate rotary member in a circumferential direction,
the intermediate rotary member being rotatable relative to the input rotary member and the output rotary member.

Assignees

• Exedy Corp

Inventors

• Kawahara Yuki
• Katsura Hitoshi
• Waki Katsuaki

Classifications

• F16D43/218 Primary

  with conical friction surfaces · CPC title

• F16D13/757

  the adjusting device being located on or inside the clutch cover, e.g. acting on the diaphragm or on the pressure plate · CPC title

• F16D7/028 Primary

  with conical friction surfaces · CPC title

• F16F15/1297 Primary

  Overload protection, i.e. means for limiting torque · CPC title

• F16D2023/123

  Clutch actuation by cams, ramps or ball-screw mechanisms · CPC title