Automatic transmission

Patent metadata

Field	Value
Publication number	US-11525488-B2
Application number	US-202117453703-A
Country	US
Kind code	B2
Filing date	Nov 5, 2021
Priority date	Nov 19, 2020
Publication date	Dec 13, 2022
Grant date	Dec 13, 2022

Abstract

An automatic transmission includes a clutch device having a clutch hub, a clutch drum, a friction plate, a piston, and a hydraulic chamber. The clutch drum includes an outer-side cylindrical portion, a disc-shaped first radial portion extending radially inwardly, an axial portion extending axially from the first radial portion, and a disc-shaped second radial portion extending radially inwardly from the axial portion. The piston includes a pressing portion disposed between the first radial portion and the friction plate side, and a disc-shaped piston radial portion extending radially inwardly from the pressing portion. The hydraulic chamber is provided radially inwardly from the axial portion and on the non-friction-plate side of the piston radial portion. A comb-teeth portion is provided at a radially intermediate portion of the piston radial portion. The axial portion and the piston radial portion intersect with each other in a comb-teeth shape.

First claim

The invention claimed is:

1. An automatic transmission comprising a clutch device, wherein
the clutch device comprises:
a clutch hub comprising an inner-side cylindrical portion located on a radial-direction inner side;
a clutch drum comprising an outer-side cylindrical portion disposed on a radial-direction outer side of the inner-side cylindrical portion;
a friction plate provided slidably between the inner-side cylindrical portion and the outer-side cylindrical portion;
a piston which presses the friction plate from a first axial-direction side; and
a hydraulic chamber to which operating oil which urges the piston in a direction of the friction plate is supplied,

the clutch drum comprises:
a disc-shaped first radial-direction portion extending from an end portion of the outer-side cylindrical portion on the first axial-direction side toward the radial-direction inner side;
a comb-teeth shaped axial-direction portion extending from an end portion of the first radial-direction portion on the radial-direction inner side toward a second axial-direction side; and
a disc-shaped second radial-direction portion extending from an end portion of the axial-direction portion on the second axial-direction side toward the radial-direction inner side,

the piston comprises:
a pressing portion disposed between the first radial-direction portion and the friction plate to press the friction plate; and
a disc-shaped piston radial-direction portion extending toward the radial-direction inner side from the pressing portion,

the hydraulic chamber is provided on the radial-direction inner side from the axial-direction portion of the clutch drum and on a non-friction-plate side of the piston radial-direction portion, and
a comb-teeth portion is provided at a radial-direction intermediate portion of the piston radial-direction portion, and the axial-direction portion and the piston radial-direction portion intersect with each other in a comb-teeth shape.

2. The automatic transmission according to claim 1 , wherein the clutch drum further comprises:
an outer-peripheral side clutch drum comprising the outer-side cylindrical portion, the first radial-direction portion, and the axial-direction portion; and
an inner-peripheral side clutch drum comprising the second radial-direction portion and attached to an inner end portion of the outer-peripheral side clutch drum in a radial direction.

3. The automatic transmission according to claim 2 , wherein the clutch drum and the piston are an additively manufactured article formed by an additive manufacturing method.

4. The automatic transmission according to claim 3 , wherein the piston further comprises:
a pressure receiving portion which receives pressure of the operating oil supplied to the hydraulic chamber; and
a bearing portion disposed between a part on the radial-direction inner side from the radial-direction intermediate portion of the piston radial-direction portion and the pressure receiving portion.

5. The automatic transmission according to claim 4 , wherein the bearing portion is disposed on the radial-direction inner side from the pressing portion of the piston so as to overlap with the pressing portion in an axial direction.

6. The automatic transmission according to claim 5 , wherein the bearing portion is disposed on the radial-direction inner side of the axial-direction portion so as to overlap with the axial-direction portion in an axial direction.

7. The automatic transmission according to claim 6 , wherein
the axial-direction portion is a first axial-direction portion,
the clutch drum comprises a second axial-direction portion extending from an end portion of the second radial-direction portion on the radial-direction inner side toward the first axial-direction side and overlapping with the first axial-direction portion in an axial direction, and
the bearing portion is disposed between the first axial-direction portion and the second axial-direction portion so as to overlap with the first axial-direction portion and the second axial-direction portion in the axial direction.

8. The automatic transmission according to claim 2 , wherein the piston further comprises:
a pressure receiving portion which receives pressure of the operating oil supplied to the hydraulic chamber; and
a bearing portion disposed between a part on the radial-direction inner side from the radial-direction intermediate portion of the piston radial-direction portion and the pressure receiving portion.

9. The automatic transmission according to claim 8 , wherein the bearing portion is disposed on the radial-direction inner side from the pressing portion of the piston so as to overlap with the pressing portion in an axial direction.

10. The automatic transmission according to claim 8 , wherein the bearing portion is disposed on the radial-direction inner side of the axial-direction portion so as to overlap with the axial-direction portion in an axial direction.

11. The automatic transmission according to claim 8 , wherein
the axial-direction portion is a first axial-direction portion,
the clutch drum comprises a second axial-direction portion extending from an end portion of the second radial-direction portion on the radial-direction inner side toward the first axial-direction side and overlapping with the first axial-direction portion in an axial direction, and
the bearing portion is disposed between the first axial-direction portion and the second axial-direction portion so as to overlap with the first axial-direction portion and the second axial-direction portion in the axial direction.

12. The automatic transmission according to claim 1 , wherein the clutch drum and the piston are an additively manufactured article formed by an additive manufacturing method.

13. The automatic transmission according to claim 12 , wherein the piston further comprises:
a pressure receiving portion which receives pressure of the operating oil supplied to the hydraulic chamber; and
a bearing portion disposed between a part on the radial-direction inner side from the radial-direction intermediate portion of the piston radial-direction portion and the pressure receiving portion.

14. The automatic transmission according to claim 13 , wherein the bearing portion is disposed on the radial-direction inner side from the pressing portion of the piston so as to overlap with the pressing portion in an axial direction.

15. The automatic transmission according to claim 13 , wherein the bearing portion is disposed on the radial-direction inner side of the axial-direction portion so as to overlap with the axial-direction portion in an axial direction.

16. The automatic transmission according to claim 13 , wherein
the axial-direction portion is a first axial-direction portion,
the clutch drum comprises a second axial-direction portion extending from an end portion of the second radial-direction portion on the radial-direction inner side toward the first axial-direction side and overlapping with the first axial-direction portion in an axial direction, and
the bearing portion is disposed between the first axial-direction portion and the second axial-direction portion so as to overlap with the first axial-direction portion and the second axial-direction portion in the axial direction.

17. The automatic transmission according to claim 1 , wherein the piston further comprises:
a pressure receiving portion which receives pressure of the operating oil supplied to the hydraulic chamber; and
a bearing portion disposed between a part on the radial-direction inner sid

Assignees

• Mazda Motor

Inventors

• Iwasaki Tatsuhiko
• Nakamura Keiichi
• Fujita Yoshihiko
• Yamada Tetsuo

Classifications

• F16D13/62

  Clutch-bands; Clutch shoes; Clutch-drums (brake-bands, brake-shoes, brake-drums F16D65/00) · CPC title

• F16D25/048

  the elastic actuating member not rotating with a coupling part · CPC title

• F16H57/0471

  Bearing · CPC title

• F16D25/0638 Primary

  with more than two discs, e.g. multiple lamellae · CPC title

• F16H57/043

  within rotary parts, e.g. axial channels or radial openings in shafts · CPC title