# US 11,078,966 B2 · Clutch friction plate and clutch device

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- Number: US 11,078,966 B2
- Document ID: US11078966B2
- Status: Granted
- Kind: B2
- Application number: 16/500,410
- Filed: 2018-03-07
- Published: 2020-06-18
- Granted: 2021-08-03
- Earliest claimed: 2017-04-04
- Assignees: Kabushiki Kaisha F.C.C.
- Applicants: Kabushiki Kaisha F.C.C.
- Inventors: Shingo Yamamoto; Yoshihiko Ozawa; Kazuma Matsushita; Hiroki Hara; Hiroyuki Ijima
- Web page: https://patentgrep.com/patent/US11078966B2

## CPC

- F16D 13/648: {for clutches with multiple lamellae}
- F16D 13/54: with means for increasing the effective force between the actuating sleeve or equivalent member and the pressure member
- F16D 13/56: in which the clutching pressure is produced by springs only
- F16D 2300/10: Surface characteristics; Details related to material surfaces
- F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES

## Abstract

Provided is a clutch friction plate and a clutch device configured so that stiction torque can be reduced and each of in gear, shift feeling, and neutral find can be smoothly performed. A clutch device (100) includes clutch friction plates (101). In the clutch friction plate (101), multiple small-piece-shaped friction members (103) are radially bonded to surfaces of a core bar (102) formed in a flat-plate annular shape through an oil groove (105). Each friction member (103) includes an outer side (104a) facing an outer edge portion of the core bar (102) and an inner side (104b) facing an inner edge portion of the core bar (102) and extending parallel to the outer side (104a), and is formed in a rectangular shape. The friction members (103) are bonded onto the core bar (102) in such a direction that the outer side (104a) and the inner side (104b) are inclined at an inclination angle (θ) with respect to a perpendicular line (CL) perpendicular to a line (OL) connecting the center (O1) of the core bar (102) as the center of rotation of the clutch friction plate (101) and the center (O2) of the friction member (103).

## Claims

### Claim 1

A clutch friction plate comprising:
multiple friction members having a substantially rectangular shape and arranged along a circumferential direction on a surface of a core bar formed in a flat-plate annular shape; and
oil grooves each formed by a clearance between adjacent ones of the friction members,
wherein each friction member includes
an outer side facing an outer edge portion of the core bar and extending along the outer edge portion, and
an inner side facing an inner edge portion of the core bar and extending parallel to the outer side along the inner edge portion,
the outer side and the inner side are inclined with respect to a perpendicular line perpendicular to a line passing through a center of the each friction member and a center of the core bar,
a width of each of the oil grooves on an outer peripheral side of the core bar is greater than a width of each of the oil grooves on an inner peripheral side of the core bar, each of the width of each of the oil grooves on the outer peripheral side and the width of each of the oil grooves on the inner peripheral side is shorter than a width of each of the friction members as a circumferential length,
the outer side and the inner side are at equal to or greater than 7° and equal to or less than 30° with respect to the perpendicular line,
the friction members are provided on front and back surfaces of the core bar, and
the friction members provided on one of the front and back surfaces are inclined with respect to the perpendicular line in a rotational direction of the clutch friction plate and the friction members provided on another one of the front and back surfaces are inclined with respect to the perpendicular line in a direction opposite to the rotational direction of the clutch friction plate.

### Claim 2 (depends on 1)

The clutch friction plate according to claim 1, wherein
the outer side and the inner side are formed to extend linearly.

### Claim 3 (depends on 1)

The clutch friction plate according to claim 1, wherein
each friction member is formed such that a side extending between each end portion of the outer side and each end portion of the inner side extends linearly.

### Claim 4 (depends on 1)

A clutch device for transferring rotary drive force of a motor to a driven shaft or blocking the rotary drive force, comprising:
the clutch friction plate according to claim 1; and
a flat-plate annular clutch plate pressed against or separated from the clutch friction plate to transfer or block the rotary drive force.

### Claim 5 (depends on 1)

The clutch friction plate according to claim 1, wherein
all of the multiple friction members arranged on the surface of the core bar have a same shape and are inclined at a same angle.

### Claim 6 (depends on 1)

The clutch friction plate according to claim 1, wherein the clutch friction plate further comprises, at at least one of the outer edge portion or the inner edge portion of the core bar, a region in which none of the friction members is present and into which a clutch oil can flow.