DRIVE DEVICE FOR CONSTRUCTION MACHINE

摘要

A drive device for a construction machine includes a speed reducer and a brake mechanism. The speed reducer includes a rotating shaft disposed in a casing, and a planetary gear type speed reducing unit disposed in the casing. The speed reducing unit includes a sun gear, a ring gear, a planetary gear which is meshed with the sun gear and the ring gear, and a spider member which supports the planetary gear so that the planetary gear is rotatable. The brake mechanism includes a rotating-shaft-side brake plate provided on an outer periphery of the spider member in a state that the rotating-shaft-side brake plate is integrally rotated with the spider member, a casing-side brake plate provided on the casing, and a brake piston which generates the braking force by bringing the rotating-shaft-side brake plate and the casing-side brake plate to press contact with each other.

主权项

1. A drive device for a construction machine, comprising:
a motor as a drive source; a speed reducer which transmits a rotation of the motor to a driven unit at a reduced speed; and a brake mechanism which generates a braking force against the rotation to be transmitted from the speed reducer to the driven unit, wherein the speed reducer includes a casing, a rotating shaft disposed in the casing, and a planetary gear type speed reducing unit disposed in the casing, the speed reducing unit includes a sun gear, a ring gear disposed to surround an outer side of the sun gear, a planetary gear which is meshed with the sun gear and the ring gear and is rotated as the sun gear is rotated, and a spider member which supports the planetary gear so that the planetary gear is rotatable, and the brake mechanism includes a rotating-shaft-side brake plate provided on an outer periphery of the spider member in a state that the rotating-shaft-side brake plate is integrally rotated with the spider member, a casing-side brake plate provided on the casing, and a brake piston which generates the braking force by bringing the rotating-shaft-side brake plate and the casing-side brake plate to press contact with each other.