# US 2014/0190776 A1 · Revolving apparatus for work vehicle

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- Number: US 2014/0190776 A1
- Document ID: US20140190776A1
- Status: Published application
- Kind: A1
- Application number: 14/115,655
- Filed: 2013-06-25
- Published: 2014-07-10
- Earliest claimed: 2012-12-07
- Assignees: Komatsu Ltd.
- Applicants: Komatsu Ltd.
- Inventors: Yousuke Kishinami
- Web page: https://patentgrep.com/patent/US20140190776A1

## CPC

- E02F 9/128: {Braking systems}
- B60T 1/062: {acting on transmission parts}
- E02F 9/0833: {Improving access, e.g. for maintenance, steps for improving driver's access, handrails}
- E02F 9/2275: {Hoses and supports therefor and protection therefor}
- F16D 55/24: with a plurality of axially-movable discs, lamellae, or pads, pressed from one side towards an axially-located member
- F16D 2055/0058: {Fully lined, i.e. braking surface extending over the entire disc circumference}
- F16D 2121/06: for releasing a normally applied brake
- E02F: DREDGING; SOIL-SHIFTING (winning peat E21C49/00)
- 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

## Abstract

A revolving apparatus for a work vehicle includes a drive unit, a brake unit under the drive unit, a deceleration unit under the brake unit, and an output unit under the deceleration unit. The brake unit has a brake main body that stops revolution, a housing, a piston and a spring. The housing has a first face with a first concave component. The piston has a second face opposite the first face with a second concave component. The piston is disposed between the brake main body and the housing, and is movable with respect to the housing in order to actuate the brake main body. The spring member has two ends held in the first and second concave components. The first and second concave components have cylindrical shapes. The inside diameter of the first concave component is greater than the inside diameter of the second concave component.

## Claims

### Claim 1

A revolving apparatus for a work vehicle, comprising:
a drive unit;
a brake unit disposed under the drive unit;
a deceleration unit disposed under the brake unit; and
an output unit disposed under the deceleration unit,
the brake unit having
a brake main body that stops revolution,
a housing having a first face and at least one first concave component formed in the first face,
a piston having a second face opposite the first face and at least one second concave component formed in the second face, the piston being disposed between the brake main body and the housing, and the piston being movable with respect to the housing in order to actuate the brake main body, and
at least one spring member having two ends held in the first concave component and the second concave component, the spring member biasing the piston toward a brake main body side so as to actuate the brake main body,
the first concave component and the second concave component having cylindrical shapes, and
an inside diameter of the first concave component is greater than an inside diameter of the second concave component.

### Claim 2 (depends on 1)

The revolving apparatus for a work vehicle according to claim 1, wherein
the brake unit has a positioning member provided from the piston along the housing that fixes a position of the piston with respect to the housing in a direction perpendicular to a movement direction of the piston.

### Claim 3 (depends on 1)

The revolving apparatus for a work vehicle according to claim 1, wherein
the housing is ring-shaped and the at least one first concave component includes a plurality of first concave components that are disposed around the ring shaped housing,
the piston is ring-shaped and the at least one second concave component includes a plurality of second concave components that are disposed around the ring shaped piston,
the brake unit is disposed on an outside of the piston and the brake unit further has a hydraulic cylinder that moves the piston against a biasing force produced by the spring member,
the at least one spring member includes a plurality of spring member, with one of the spring members provided for each of the first concave component and second concave component that are opposite each other,
the brake main body has a plurality of brake plates and brake disks disposed alternately,
in a first state in which the brake main body is actuated,
the piston presses on the brake plates and the brake disks, and
the brake disks are squeezed by the brake plates, and
in a second state in which the brake main body is not actuated,
pressing on the brake plates and brake disks by the movement of the piston produced by the hydraulic cylinder is released, and
squeezing of the brake plates on the brake disks is released.