Patent ID: 9476498
Filing Date: 2016-10-25
CPC Classification: B60T,E02F,F16D,F16H

Claim Text:
1. A drive device for a construction machine driving a driven unit of the construction machine, comprising: a motor as a drive source; a speed reducer configured to transmit a rotation of the motor to the driven unit at a reduced speed; and a brake mechanism configured to generate a braking force against the rotation to be transmitted from the speed reducer to the driven unit, wherein the motor and the speed reducer are arranged side-by-side in an up-down direction in such a manner that centers of respective rotating shafts thereof are aligned with each other and the motor is located above the speed reducer; and the speed reducer has a casing in which lubricating oil and the brake mechanism are provided, and wherein the brake mechanism comprises: a ring-shaped brake piston; and a brake plate configured to generate the braking force by means of a pressing force of the brake piston, and wherein the brake piston has: a plurality of oil pockets provided in the brake piston at respective positions along a circumferential direction of the brake piston, each of the oil pockets formed as a space capable of storing lubricating oil; oil inlets allowing lubricating oil rising during operation of the drive device to be introduced into the oil pockets respectively; and oil outlets allowing lubricating oil stored in the respective oil pockets to be discharged, wherein the brake piston is provided in an outer peripheral region of an inner space of the casing, and wherein the oil inlets are provided in the brake piston, the oil inlets including lower oil inlets and upper oil inlets, the lower oil inlets allowing an outer peripheral portion of lubricating oil in a situation where an oil surface of the lubricating oil has an inverted cone shape during the operation of the drive device to be introduced into the oil pockets from therebeneath, the upper oil inlets allowing lubricating oil splattered during the operation of the drive device to be introduced into the oil pockets from lateral sides thereof.