Turning unit of construction machine
AssigneeKobelco Construction Machinery Co., Ltd.
InventorsHidekazu Iwashita, Kenichi Terauchi, Masatsugu Hamasaki, Takamasa Abe, Yoshiki Kamon
Life of this patent
Estimating the term…
Abstract
Formed inside a housing of a slewing unit are: an upper outer space located outside a piston in the radial direction, and at least one supply passage that guides, inward in the radial direction, a lubricant that has passed through a lower space, an outer passage, and an upper outer space in this order, to the lubricant to a plurality of brake members located below the piston. The plurality of brake members are disposed above a speed reducer and receive pressing force from the piston to brake the rotation of a rotation shaft before the rotation is decelerated by the speed reducer.
Claims13
A slewing unit of a construction machine, the slewing unit comprising:
- a rotation shaft to which rotational force of a slewing motor is transmitted, the rotation shaft extending in an up-and-down direction;
- a speed reducer to decelerate rotation of the rotation shaft;
- a piston located to surround the rotation shaft with a spacing to the rotation shaft outside the rotation shaft in a radial direction, the piston being displaceable in the up-and-down direction;
- a housing that accommodates the rotation shaft, the speed reducer, and the piston, the housing including a guide portion that is located to surround the piston to guide the piston in the up-and-down direction;
- and
- a plurality of brake members that includes:
- a rotation side brake member that is located to surround the rotation shaft and rotates as the rotation shaft rotates;
- and a housing side brake member supported by the housing to face the rotation side brake member in the up-and-down direction, the plurality of brake members being located below the piston,
- wherein an upper central space in which at least part of the rotation shaft is disposed, the upper central space being a space surrounded by an inner circumferential surface of the piston;
- a lower space in which the speed reducer is disposed, the lower space being located below the upper central space;
- an upper outer space located outside the piston in the radial direction and above the lower space;
- an outer passage that connects the lower space to the upper outer space;
- and at least one supply passage that guides, inward in the radial direction, a lubricant that has passed through the lower space, the outer passage, and the upper outer space in this order to supply the lubricant to the plurality of brake members located below the piston are formed in the housing, and
- the plurality of brake members is disposed above the speed reducer and is configured to brake, by receiving pressing force from the piston, the rotation of the rotation shaft before being decelerated by the speed reducer.
Dependencies are inferred from the claim text.