# US 9,752,630 B2 · Centrifugal clutch

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- Number: US 9,752,630 B2
- Document ID: US9752630B2
- Status: Granted
- Kind: B2
- Application number: 14/815,757
- Filed: 2015-07-31
- Published: 2016-03-10
- Granted: 2017-09-05
- Earliest claimed: 2014-09-09
- Assignees: Kawasaki Jukogyo Kabushiki Kaisha
- Applicants: Kawasaki Jukogyo Kabushiki Kaisha
- Inventors: Tsuneyoshi Yuasa
- Web page: https://patentgrep.com/patent/US9752630B2

## CPC

- F16D 43/18: with friction clutching members
- A01D 34/90: for carrying by the operator
- A01D 69/08: Clutches
- F16D 2043/145: {the centrifugal masses being pivoting}
- F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- A01D: HARVESTING; MOWING

## Abstract

A centrifugal clutch intermittently transmits power of rotation about an axis. The centrifugal clutch includes: a plurality of clutch shoes that are pressed against an inner peripheral surface of a clutch drum; a plurality of pivot members configured to rotatably support the clutch shoes; and a pressing member having a plurality of insertion portions that are inserted between head portions of the pivot members and the clutch shoes. The pressing member has a connecting portion that connects between the plurality of insertion portions, and the insertion portions and the connecting portion are curved in a direction of the axis.

## Claims

### Claim 1

A centrifugal clutch that intermittently transmits power of rotation about an axis, the centrifugal clutch comprising:
a clutch drum;
a plurality of clutch shoes that are pressed against an inner peripheral surface of the clutch drum;
a plurality of pivot members configured to rotatably support the clutch shoes; and
a pressing member having a plurality of insertion portions that are inserted between head portions of the pivot members and the clutch shoes, wherein the pressing member has a connecting portion that connects between the plurality of insertion portions, the plurality of insertion portions and the connecting portion forming a curvature that extends between the plurality of insertion portions and along the entire connecting portion.

### Claim 2 (depends on 1)

The centrifugal clutch as claimed in claim 1, wherein the plurality of insertion portions and the connecting portion are curved inward in a direction of the axis.

### Claim 3 (depends on 2)

The centrifugal clutch as claimed in claim 2, wherein the plurality of insertion portions are provided with a plurality of insertion holes into which the pivot members are inserted.

### Claim 4 (depends on 2)

The centrifugal clutch as claimed in claim 2, wherein the plurality of insertion portions each have an arc-shaped portion formed along a portion, closer to the axis, of an outer periphery of each pivot member.

### Claim 5 (depends on 1)

The centrifugal clutch as claimed in claim 1, wherein the insertion portions and the connecting portion are curved outward in a direction of the axis.

### Claim 6 (depends on 1)

The centrifugal clutch as claimed in claim 1, wherein a gap between the head portions of the pivot members and the clutch shoes is a dimension G, and a plate thickness T of the pressing member is set within the range of 0.4G to 0.6G.

### Claim 7 (depends on 1)

The centrifugal clutch as claimed m claim 1, wherein a distance between axes of the pivot members is of a dimension D, and a radius of curvature R formed by the plurality of insertion portions and the connecting portion is set within the range of 2D to 4D.