JPH01111802U

JPH01111802U -

Info

Publication number: JPH01111802U
Application number: JP693488U
Authority: JP
Priority date: 1988-01-22
Filing date: 1988-01-22
Publication date: 1989-07-27

Description

[Brief explanation of the drawing]

第１図は本考案の実施例を示す回路図、第２図
は本実施例による旋回モータ停止時の流出入ポー
トの圧力特性を示す線図、第３図は従来技術によ
る旋回モータ停止時の流出入ポートの圧力特性を
示す線図である。１……旋回モータ、２Ａ，２Ｂ……駆動管路、
３……油圧ポンプ、４……タンク、５……方向切
換弁、６……ブレーキ弁、９……連通管路、１０
……切換弁、１０Ａ，１０Ｂ……油圧パイロツト
部、１１Ａ，１１Ｂ，３１……絞り、１２……補
助油圧ポンプ、１４……循環管路、１５……差圧
発生用絞り、１６Ａ，１６Ｂ……パイロツト管路
、１７……ブレーキ装置、１８……連動切換弁、
２０……パイロツトポンプ、２１……制動作用遅
延用絞り、２２……ブレーキ管路。 Fig. 1 is a circuit diagram showing an embodiment of the present invention, Fig. 2 is a line diagram showing the pressure characteristics of the inflow and outflow ports when the swing motor is stopped according to the present embodiment, and Fig. 3 is a diagram showing the pressure characteristics of the inflow and outflow ports when the swing motor is stopped according to the prior art. FIG. 3 is a diagram showing pressure characteristics of an inflow and outflow port. 1...Swivel motor, 2A, 2B...Drive conduit,
3... Hydraulic pump, 4... Tank, 5... Directional switching valve, 6... Brake valve, 9... Communication pipe, 10
...Switching valve, 10A, 10B... Hydraulic pilot section, 11A, 11B, 31... Restriction, 12... Auxiliary hydraulic pump, 14... Circulation pipe line, 15... Restriction for generating differential pressure, 16A, 16B... ... Pilot pipe line, 17 ... Brake device, 18 ... Interlocking switching valve,
20... Pilot pump, 21... Braking delay throttle, 22... Brake pipe.

Claims

[Scope of utility model registration request]

A swing motor capable of forward and reverse rotation for rotationally driving a swing body, a drive pipe connecting the swing motor to a hydraulic pump and a tank, a directional switching valve provided in the middle of the drive pipe, and a directional switching valve. In a swing motor drive circuit comprising a brake valve located between a valve and a swing motor and provided in the middle of the drive pipe, a communication pipe that communicates between the inflow and outflow ports of the swing motor; Hydraulic pilot type switching installed in the middle of the pipeline, which is normally held in the central communicating position and switched to the left and right blocking positions by supplying pilot pressure to the left and right hydraulic pilot sections. a valve, a throttle located on both sides of the switching valve and provided in the middle of the communication pipe or on the switching valve in order to prevent pressure oil from escaping through the switching valve when the swing motor is started; An auxiliary hydraulic pump that is rotated forward and reverse by a swing motor, a circulation pipe connecting the inflow and outflow ports of the auxiliary hydraulic pump, and a throttle for generating a differential pressure provided in the middle of the circulation pipe; A pilot line supplies the differential pressure generated in the circulation line by the differential pressure generating throttle to each hydraulic pilot section of the switching valve as pilot pressure, and a pilot line that supplies the differential pressure generated in the circulation line as pilot pressure to each hydraulic pilot section of the switching valve, and when the swing motor is stopped, A swing motor drive circuit comprising a brake device that applies braking.