Hydraulic drive device for hydraulic work machine

A driving device and operating machine technology, applied in the direction of fluid pressure actuating device, transmission device control, mechanical equipment, etc., can solve the problems of difficult and complicated structure and achieve the effect of widening the range

Active Publication Date: 2013-04-17
NIHON KENKI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, a variable relief valve with a non-shock function requires a very complicated mechanism, and it is difficult to implement in terms of structure and price.

Method used

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  • Hydraulic drive device for hydraulic work machine
  • Hydraulic drive device for hydraulic work machine
  • Hydraulic drive device for hydraulic work machine

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0044] figure 1 It is a figure which shows the hydraulic drive apparatus of the hydraulic working machine which concerns on the 1st Embodiment of this invention.

[0045] The hydraulic drive device includes: a diesel engine 1 as a prime mover; a variable-capacity hydraulic pump 2 driven by the engine 1; a hydraulic oil tank 3; (Refer to figure 2 ) swivel motor unit 4 of hydraulic swivel motor 40 driven by rotation; control valve 5 with a plurality of built-in directional control valves including rotational direction control valve 50 for controlling the pressure supplied from hydraulic pump 2 to hydraulic swivel motor 40 The flow of oil is controlled; the lever device 6 for instructing the operation of the rotating body 101 ; the controller 7 ; the relief pressure change instruction switch 8 ; the oil cooler 9 ;

[0046] The control valve 5 has a valve housing 52 in which the main spool valve 51a of the rotational direction control valve 50 is arranged. Pressure receiving por...

no. 2 approach

[0089] Figure 4 It is a figure which shows the hydraulic drive apparatus of the hydraulic working machine which concerns on 2nd Embodiment of this invention. In the figure, with figure 1 Parts that are identical to those shown are given the same reference numerals.

[0090] Figure 4Among them, the rotary motor unit 4A is composed of a rotary motor section 4-1 and an additional relief valve section 4-2.

[0091] In the swing motor section 4-1, a hydraulic swing motor 40 is arranged in a casing 41-1, and a pair of actuator oil passages 42a-1 and 42b-1 and an internal discharge oil passage 43-1 are formed. In addition, a pair of first rotary relief valves 44a and 44b with no shock function and a pair of check valves 45a and 45b for replenishment are arranged.

[0092] In addition, the housing 41-1 has a first port surface 63 to which the ports 61a and 61b of the pair of actuator oil passages 42a-1 and 42b-1 and the port 62 on one end side of the internal discharge oil passa...

no. 3 approach

[0099] Figure 5 It is a figure which shows the hydraulic drive apparatus of the hydraulic working machine which concerns on 3rd Embodiment of this invention. In the figure, for the figure 1 and Figure 4 Parts that are identical to those shown are given the same reference numerals.

[0100] Figure 5 Among them, the rotary motor unit 4B is constituted by the rotary motor section 4-1B and the additional relief valve section 4-2B, and the additional relief valve section 4-2B is used as the connection between the housing 41-2 and the rotary motor section 4-1. The casing 41-1 is constituted by an independent relief valve block, the casing 41-2 is fixed to the first port surface 63 of the casing 41-1 of the rotary motor section 4-1B by bolts, etc. and assembled, thereby being combined with the rotary motor The section 4-1B is integrated, as in the second embodiment.

[0101] In this embodiment, the port of the internal discharge oil passage 43-1B is not open to the first port...

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Abstract

In order to easily make the drive / brake pressure and maximum drive / braking torque of a hydraulic swing motor changeable, keeping the structure of a shock-less functionality as is, the following are provided inside a swing motor unit (4): first swing relief valves (44a and 44b), equipped with a shock-less functionality, that prevent the drive / brake pressure of the hydraulic swing motor (40) from exceeding a first set pressure; and second swing relief valves (46a and 46b) that prevent the drive / brake pressure of the hydraulic swing motor from exceeding a second set pressure, which is lower than the first set pressure. One of the following modes can be selected by operating a relief-pressure change switch (8) to actuate changeover valves (47a and 47b): a mode in which the relief characteristics of the first swing relief valves stay in effect; or a mode which produces relief characteristics wherein the first set pressure, for the first swing relief valves, is lowered to the second set pressure (from the second swing relief valves).

Description

technical field [0001] The present invention relates to a hydraulic drive device provided in a hydraulic working machine such as a hydraulic excavator, in which the relief pressure of a hydraulic swing motor that drives a swing body is variable. Background technique [0002] A hydraulic drive device of a hydraulic working machine having a revolving body, such as a hydraulic excavator, has a swing motor unit in which a hydraulic swing motor for driving the revolving body is built. A relief valve called an overload relief valve is arranged in the swing motor unit so that the pressure of the hydraulic oil supplied to the hydraulic swing motor or the pressure of the pressure oil discharged from the swing motor does not exceed a predetermined pressure. limit. [0003] As a relief valve of a hydraulic swing motor, as described in Patent Document 1, there is known a relief valve which has a shock-less function in order to reduce the shock at the time of rotation start or rotation ...

Claims

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Application Information

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IPC IPC(8): F15B11/028E02F9/22F15B11/00
CPCE02F3/962E02F9/123E02F9/128E02F9/2282E02F9/2285E02F9/2296F15B11/0406F15B2211/20546F15B2211/50527F15B2211/613F15B2211/7058E02F9/22F15B11/00F15B11/028F16H61/4043F16H61/4052F16H61/4061
Inventor 石川广二梶田勇辅佐竹英敏大木孝利
Owner NIHON KENKI CO LTD
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