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Hydraulic unit

A technology of hydraulic unit and flow rate, applied in the direction of liquid variable volume machinery, fluid pressure actuating device, servo motor, etc., to prevent heat generation, prevent oil heat generation, and ensure stability.

Inactive Publication Date: 2014-03-12
DAIKIN IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Embodiment Construction

[0031] Hereinafter, the present invention will be described in detail based on the illustrated embodiments.

[0032] figure 1 A circuit diagram of an oil pressure unit that is one embodiment of the hydraulic unit of the present invention is shown. Such as figure 1 As shown, the hydraulic unit has a fixed displacement pump 1 and a motor 2 that drives the pump 1 . The suction side of the pump 1 is connected to an oil tank 10 storing oil, and the main engine 7 is connected to a discharge line 11 of the pump 1 . The main unit 7 has a hydraulic cylinder, a hydraulic motor, a solenoid valve, and the like, which are not shown. The oil discharged from the pump 1 is returned to the oil tank 10 via the main engine 7 .

[0033] The overflow valve 3 is connected to a branch pipe 12 branching off from the discharge line 11 of the pump 1 . The relief valve 3 is controlled in the following manner: when the discharge pressure of the pump 1 on the upstream side of the relief valve 3 is ...

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Abstract

Provided is a hydraulic unit. A surplus flow control unit (50) controls an inverter (6): in a manner such that when the flow discharged from a pump (1) is a high flow, the surplus flow from a relief valve (3) is a low surplus flow; and in a manner such that when the flow discharged from the pump (1) is a low flow that is lower than the high flow, the surplus flow from the relief valve (3) is a high surplus flow that is higher than the low surplus flow.

Description

technical field [0001] The present invention relates to hydraulic units such as hydraulic units and hydraulic units used in various industrial machines such as construction machines, agricultural machines, machine tools, and injection molding machines. Background technique [0002] Such as Figure 8 As shown, regarding the oil pressure unit, there has been a device having the following structure in the past: a pump 101 of a fixed capacity type; a motor 102, which drives the pump 101; an overflow valve 103, which is connected to a discharge line 106 of the pump 101; A flow sensor 104, which is connected between the relief valve 103 and the oil tank 107, detects the residual flow from the relief valve 103; and a rotational speed control unit 105, which controls the rotational speed of the motor 102 according to the signal from the flow sensor 104 (JP-A-11-303758: refer to Patent Document 1). [0003] Furthermore, the rotation speed control unit 105 performs feedback control o...

Claims

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Application Information

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IPC IPC(8): F04B49/06F15B11/00
CPCF15B2211/2658F15B11/055F15B2211/50536F04B49/06F04B49/24F04B49/22F15B2211/632F15B2211/20515F15B2211/20538
Inventor 中村博一河田健一井上贵仁
Owner DAIKIN IND LTD