Rotary drives for construction machinery

Abstract

The present invention relates to a rotary driving device of a construction machine, and more specifically, to a rotary driving device of a construction machine for rotating an upper body in a lower body. The slewing drive device of construction machinery of the present invention provides the external size of the slewing drive device with the same or equivalent size as the conventional slewing drive device, and at the same time increases the deceleration ratio to improve power output and torque. The rotary drive device of the construction machine according to the present invention can reduce the energy loss caused by the working oil when the rotary drive device is driven at a high speed.

Description

technical field [0001] The present invention relates to a rotary driving device of a construction machine, and more specifically, to a rotary driving device of a construction machine for rotating an upper body in a lower body. Background technique [0002] Generally speaking, construction machinery (10) such as figure 1 The assembly shown is such that the upper body (12) and the lower body (14) can be turned around by means of the connecting unit (16). A turning drive device (100) is provided inside the connection unit (16). [0003] In more detail, the rotary driving device (100) is fixed on the upper body (12), such as figure 2 As shown, a rotary drive gear (102) is provided on the lower side of the rotary drive device (100), and a rotary driven gear (104) is formed on the connection unit (16) on the lower body (14) side. The rotary drive gear (102) is internally engaged with the rotary driven gear (104) to realize gear transmission. [0004] with reference to the att...

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Problems solved by technology

[0023] Thus, with regard to the conventionally known rotary drive device (100), if a certain specific gear is provided smaller simply to increase the deceleration ratio of the second-speed transmission, there is a problem of reduced durability. If a specific gear is provided, the rotary drive device (100) is too large in size and takes up a lot of space, so there is a practical problem that it is difficult to add it to construction machinery

[0024] On the other hand, although there is a proposal that the reduction gear unit (sun gear, planetary carrier, planetary gear, ring gear) is constituted by three layers in the reduction unit (400), in this case, the rotary drive device (100) The overall height (refer to H) will increase, and there is a practical problem that it is difficult to install on construction machinery due to the space occupied

[0025] In addition, in the proposal that the reduction gear unit (sun gear, planetary carrier, planetary gear, and ring gear) is composed of three layers in the reduction unit (400), when high-speed rotation is realized, the brake unit (300) is filled with The friction loss caused by the working oil (106) has a large effect, and energy loss will occur

In particular, inside the reduction unit (400), the three-layer reduction gear structure rubs against the gear oil (108), so when the reduction structure rotates at high speed, there is friction loss due to the highly viscous gear oil (108). greatly increased worry

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