# US 8,783,434 B2 · Vehicle transmission with built-in brake

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- Number: US 8,783,434 B2
- Document ID: US8783434B2
- Status: Granted
- Kind: B2
- Application number: 13/580,839
- Filed: 2010-10-25
- Published: 2012-12-20
- Granted: 2014-07-22
- Earliest claimed: 2010-02-25
- Assignees: Mitsubishi Nichiyu Forklift Co., Ltd.; Okamura Corporation
- Applicants: Fujito Aikawa; Akihiko Fujimoto
- Inventors: Fujito Aikawa; Akihiko Fujimoto
- Web page: https://patentgrep.com/patent/US8783434B2

## CPC

- B60K 17/046: {with planetary gearing having orbital motion}
- B60T 1/062: {acting on transmission parts}
- F16D 55/36: Brakes with a plurality of rotating discs all lying side by side
- B60K 7/0007: {the motor being electric}
- B60Y 2200/15: Fork lift trucks, Industrial trucks
- F16D 2121/02: Fluid pressure
- F16D 2121/14: Mechanical
- F16D 2123/00: Multiple operation forces
- F16D 2125/64: Levers
- B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60T: VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL (electrodynamic brake systems for vehicle, in general B60L; brakes per se, i.e. devices where braking effect occurs, including ultimate brake actuators, F16D); ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- B60Y: INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY

## Abstract

A hydraulic piston is housed in a cylinder chamber that is provided in a cover plate of a transmission case and that opens toward a pressing arm so that the hydraulic piston is capable of rotating the pressing arm by abutting against a rearward arm portion of the pressing arm, and a hydraulic pipe supplying pressure oil to the cylinder chamber is connected to the cover plate.

## Claims

### Claim 1

A vehicle transmission with a built-in brake, comprising:
a transmission case having a sidewall;
a disc brake unit housed in the transmission case, the disc brake unit having a pressing rod penetrating the sidewall and a pressure plate; and
a pressing arm that is pivotally provided in a rotatable manner on the sidewall and that is rotated by a dual system including a parking brake cable and a hydraulic piston operated by operation of a brake pedal, the pressing arm having one end for pressing an outer end of the pressing rod,
wherein the hydraulic piston is housed in a cylinder chamber that is open toward the pressing arm provided on the sidewall so as to be capable of abutting against the other end of the pressing arm and rotating the pressing arm, and a hydraulic pipe that supplies pressure oil to the cylinder chamber is connected to the sidewall.

### Claim 2 (depends on 1)

The vehicle transmission with a built-in brake according to claim 1, wherein a pin is interposed between the pressing arm and the hydraulic piston so as to be movable in a tilting manner relative to the hydraulic piston.

### Claim 3 (depends on 2)

The vehicle transmission with a built-in brake according to claim 2, wherein a conical depressed portion is provided at an end face of the hydraulic piston facing the pressing arm, and the pin having a spherical end face on the hydraulic piston side is abutted so as to be movable in a tilting manner against a bottom surface of the depressed portion.

### Claim 4 (depends on 1)

The vehicle transmission with a built-in brake according to claim 1, wherein a pin having a spherical end face on the pressing arm side is integrally provided in a protruding manner on an outer face of the hydraulic piston, and the spherical end face is abutted against the other end of the pressing arm.

### Claim 5 (depends on 1)

The vehicle transmission with a built-in brake according to claim 1, wherein the hydraulic pipe is fixed relative to the sidewall.