JPH0717860Y2 - Revolving structure braking device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a braking device for a swing structure of a crane vehicle.

[Conventional technology]

In a hydraulic excavator / crane, etc. that has a revolving structure that allows the upper cradle to rotate freely by connecting the lower cradle and the upper cradle with an inner / outer ring bearing including a rotor interposed between them, without revolving the revolving car to the stop position. As a means for holding,
There are means such as 58-24627.

[Problems to be solved by the invention]

In the above-mentioned conventional means, since the brake shoe member is in contact with the axial side surface of the outer ring body or the inner ring body forming the slewing bearing mechanism, and further, in the portion close to the rolling portion of the ball, this brake shoe member is provided. Lubricating oil scattered from the rolling portion of the ball was apt to adhere to the portion where the abutted against each other, and slippage of the brake shoe member was easily caused.

Further, in the above-mentioned conventional structure, since one set of braking devices can have only one braking surface due to its configuration, the contact area must be increased in order to obtain a predetermined braking force.
It was difficult to make the device compact.

[Purpose of device]

The present invention has been made in view of the above, and the lubricating oil scattered from the slewing bearing mechanism is less likely to adhere to the brake shoe of the braking device. Therefore, the braking failure of the braking device due to the leakage of the lubricating oil from the slewing bearing mechanism is prevented. It is a turning system that can be eliminated and provides a wide braking surface in a space smaller than that of the conventional braking device for a revolving structure, thus making the entire braking device compact to obtain the required braking force. The object is to provide a body braking device.

[Means for solving problems]

In order to achieve the above-mentioned object, an automatic device for a revolving superstructure according to the present invention is an upper / lower revolving structure in which a lower pedestal is provided with an upper pedestal through a revolving bearing mechanism and the upper pedestal is pivotally moved. In one of the above, a cylindrical support member is provided inside the swivel bearing mechanism, coaxial with the swivel axis, and a ring-shaped disc play is provided inside this support member, and On the other hand, the mechanism is provided with a brake caliper mechanism which is adapted to be operated by hydraulic pressure so as to be operated by hydraulic pressure.

[Action]

By supplying pressure oil to the brake caliper mechanism, the brake caliper mechanism operates and the disc plate is pressed from the upper and lower sides to perform braking, and the upper mount is held in the stop position without play (rattle). It

At this time, since the brake caliper mechanism is located inside the cylindrical support member provided inside the slewing bearing mechanism, even if the lubricating oil leaks from the above slewing bearing mechanism, it will reach the position of the brake caliper mechanism. And the braking surface is not contaminated with the lubricating oil of the slewing bearing mechanism.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. In the drawing, 1 is a lower frame which is a lower mount equipped with a suspension device (not shown), and 2 is a revo frame which is an upper mount equipped with an upper revolving structure (not shown).

An annular mounting seat body 3 is fixed to the upper surface of the lower frame 1, and an inner ring body 4 is fixed to the upper surface of the mounting seat body 3 with bolts 5, and an inner peripheral portion of the inner ring body 4 is fixed. Ring gear 6
And a ring groove 7 is formed on the outer peripheral portion of the inner race 4.

An attachment seat body 8 is fixed to the lower surface of the revo frame 2, and an outer ring body 9 is attached to the attachment seat body 8 with bolts 10. A ring groove 11 is formed on the inner peripheral portion of the outer ring body 9, and a large number of balls 12 are inserted into the ring grooves 7 and 11 of the outer ring bodies 4 and 9, respectively. Structure
Makes up thirteen.

A turning motor (not shown) is provided on the side of the revo frame 2, and a gear 14 provided on the output shaft of the turning motor.
Mesh with the link gear 6.

A cylindrical support member 15 is fixed to the mounting seat body 3 of the lower frame 1 so as to be positioned inside the swivel bearing mechanism, and a ring-shaped disc plate 16 is fixed inside the support member 15. It is set up. A brake caliper mechanism 17 is fixed to the revo frame 2, and the disc plate 16 is inserted between the upper and lower brake shoe members 18, 19 of the brake caliper mechanism 17. A pressure oil supply port 18 'of the brake caliper mechanism 17 is connected to a master cylinder 20 via a pipe 19', and the master cylinder 20 is connected to a ratchet type hand brake operating lever 21.

Next, the operation will be described.

The gear 14 is rotated by the drive of the swing motor,
The revolving frame 13 is revolved around the revolving center P by rolling 14 on the 6th surface of the link gear to revolve the upper revolving structure.

When the upper revolving structure is held in the stop position without play (rattle), the hand brake operating lever 21 is operated in the driver's seat to operate the master cylinder 20, and pressure oil is sent to the brake caliper mechanism 17 to move up and down. The disc plate 16 is held between the brake shoe members 18 and 19.

[Effect of device]

As described in detail above, the swing structure braking device according to the present invention is
Lubricating oil scattered from the slewing bearing mechanism is less likely to adhere to the brake shoe of the braking device, so that braking failure of the braking device due to leakage of lubricating oil from the slewing bearing mechanism can be eliminated.

Further, according to the present invention, a wide braking surface can be obtained in a space smaller than that of the conventional revolving structure braking device, and the entire braking device for obtaining a required braking force can be made compact.

[Brief description of drawings]

The drawing is a longitudinal cross-sectional view of an embodiment of the present invention with some parts omitted. 1 is a lower frame, 2 is a revo frame 13, 13 is a slewing bearing structure, 15 is a support member, 16 is a disc plate, and 17 is a brake caliper mechanism.

Claims (1)

[Scope of utility model registration request] 1. A revolving structure in which an upper pedestal is provided on a lower pedestal via a slewing bearing mechanism, and the upper pedestal is rotatably moved. Then, a cylindrical support member is provided coaxially with the swivel axis, a ring-shaped disc plate is provided inside the support member, and the other upper and lower mounts are braked by hydraulic pressure. A revolving structure braking device comprising a brake caliper mechanism.