US 11,536,322 B2Granted

Automatic transmission

AssigneeMazda Motor Corporation

InventorsTatsuhiko Iwasaki, Tatsutoshi Mizobe, Yoshihiko Fujita, Keiichi Nakamura

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Abstract

An automatic transmission has a one-side clutch and an other-side clutch in an axial direction, the one-side clutch and the other-side clutch being aligned in the axial direction on an axis of a power transmission shaft. These clutches respectively include: drum sections; hub sections; friction plates that are engaged in an axially slidable manner between the drum sections and the hub sections; and pistons that press the friction plates. The friction plates in the one-side and other-side clutches are arranged in parallel in the axial direction. The pistons in the one-side clutch and the other-side clutch are arranged on one sides in the axial direction of the friction plates and are arranged such that axial positions thereof overlap. The piston in the other-side clutch penetrates the friction plate in the one-side clutch in the axial direction.

Claims10

Dependent claims

An automatic transmission comprising a one-side clutch in an axial direction and an other-side clutch in the axial direction, the one-side clutch and the other-side clutch being aligned in the axial direction on an axis of a power transmission shaft, each of the clutches including:

a cylindrical drum section;
a cylindrical hub section that opposes the drum section;
a friction plate that is engaged between the drum section and the hub section in an axially slidable manner;
and
a piston that presses the friction plate, wherein
the friction plate in the one-side clutch and the friction plate in the other-side clutch are arranged in parallel in the axial direction,
the piston in the one-side clutch and the piston in the other-side clutch are arranged on one side in the axial direction of the friction plate in the one-side clutch and are arranged such that axial positions thereof overlap,
the piston in the other-side clutch penetrates the friction plate in the one-side clutch in the axial direction,
the other-side clutch is a first other-side clutch that is arranged on the one-side clutch side, and the automatic transmission further includes a second other-side clutch that is arranged on the other side in the axial direction of the first other-side clutch,
the piston in the first other-side clutch penetrates the friction plate in the one-side clutch in the axial direction, and
a piston in the second other-side clutch penetrates the friction plate in the one-side clutch and the friction plate in the first other-side clutch in the axial direction.

8 more elements

a cylindrical drum section;
a cylindrical hub section that opposes the drum section;
a friction plate that is engaged between the drum section and the hub section in an axially slidable manner;
and
a piston that presses the friction plate, wherein
the friction plate in the one-side clutch and the friction plate in the other-side clutch are arranged in parallel in the axial direction,
the piston in the one-side clutch and the piston in the other-side clutch are arranged on one side in the axial direction of the friction plate in the one-side clutch and are arranged such that axial positions thereof overlap,
the piston in the other-side clutch penetrates the friction plate in the one-side clutch in the axial direction,
a vertical wall section of the drum section in the one-side clutch is provided to be orthogonal to the axis, and an inner circumferential portion, an intermediate portion, and an outer circumferential portion of the vertical wall section form rear surfaces of respective hydraulic chambers in the one-side clutch and the other-side clutch, and
the hydraulic chambers overlap each other in the axial direction, and the hydraulic chamber in the other-side clutch is superimposed on an outer circumferential side of the hydraulic chamber of the one-side clutch.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/452,537Filed 27 Oct 2021
Priority: JP JP2020-18974013 Nov 2020
Published: US 2022/0154783 A119 May 2022
Granted: 27 Dec 2022
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

F16D 25/10
Fluid-actuated clutches: clutch systems with a plurality of fluid-actuated clutches
F16D 25/0638
With flat friction surfaces, e.g. discs: with more than two discs, e.g. multiple lamellae
F16D 2021/0661
At least two driving shafts or two driven shafts being concentric: hydraulically actuated multiple lamellae clutches
F16D 2121/04
Fluid pressure: acting on a piston-type actuator, e.g. for liquid pressure