# US 2019/0376591 A1 · Fluid transmission device

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- Number: US 2019/0376591 A1
- Document ID: US20190376591A1
- Status: Published application
- Kind: A1
- Application number: 16/473,548
- Filed: 2018-03-27
- Published: 2019-12-12
- Earliest claimed: 2017-03-27
- Assignees: Aisin Aw Co., Ltd.
- Applicants: Aisin Aw Co., Ltd.
- Inventors: Kazuyoshi ITO; Hiromitsu TAKENAKA; Makoto NAKAZURU; Mayuko KAWADA
- Web page: https://patentgrep.com/patent/US20190376591A1

## CPC

- F16H 45/02: with mechanical clutches for bridging a fluid gearing of the hydrokinetic type (control of torque converter lock-up clutches F16H61/14)
- F16H 41/24: Details
- F16H 2045/0221: {with damping means}
- F16H 2045/0226: {comprising two or more vibration dampers}
- F16H 2045/0278: {comprising only two co-acting friction surfaces}
- F16H 2045/0289: {Details of friction surfaces of the lock-up clutch}
- F16H: GEARING

## Abstract

A fluid transmission device that includes a pump impeller connected to an input; a turbine runner disposed so as to face the pump impeller; an output coupled to the turbine runner; and a lockup clutch device configured to execute lockup in which the input and the output are coupled and lockup release in which the coupling of the input and the output is disconnected, the pump impeller, the turbine runner, the output, and the lockup clutch device being provided in the input.

## Claims

### Claim 1

A fluid transmission device comprising:
a pump impeller connected to an input;
a turbine runner disposed so as to face the pump impeller;
an output coupled to the turbine runner; and
a lockup clutch device configured to execute lockup in which the input and the output are coupled and lockup release in which the coupling of the input and the output is disconnected,
the pump impeller, the turbine runner, the output, and the lockup clutch device being provided in the input, wherein
the input has a first engagement surface and a second engagement surface that face each other with the lockup clutch device interposed between the first engagement surface and the second engagement surface in an axial direction, and
the lockup clutch device has a first lockup clutch that includes a first lockup piston in which a friction material is affixed to a surface that faces the first engagement surface, and a second lockup clutch that includes a second lockup piston in which a friction material is affixed to a surface that faces the second engagement surface, and executes lockup by supplying working oil between the first lockup piston and the second lockup piston so that the first lockup piston and the second lockup piston are spaced away from each other in the axial direction.

### Claim 2 (depends on 1)

The fluid transmission device according to claim 1, wherein
the first engagement surface is formed on a side of the input away from the pump impeller and the turbine runner,
the second engagement surface is formed on a side of the input closer to the pump impeller and the turbine runner, and
a surface area of the friction material affixed to the second lockup piston is larger than a surface area of the friction material affixed to the first lockup piston.

### Claim 3 (depends on 1)

The fluid transmission device according to claim 1, wherein
a damper device is provided between the first lockup piston and the second lockup piston in the axial direction, and
the lockup clutch device couples the input and the output via the damper device.

### Claim 4 (depends on 1)

The fluid transmission device according to claim 1, wherein the second lockup piston is provided closer to the turbine runner than the first lockup piston and is movable independently from the turbine runner.