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Pump unit

A pump unit, displacement pump technology, applied in the direction of pumps, pump components, multi-cylinder pumps, etc.

Inactive Publication Date: 2012-05-16
KANZAKI KOKYUKOKI MFG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this way, in Japanese Patent Application Publication No. 2000-319942, Japanese Patent Application Publication No. 2000-220566, Japanese Patent Application Publication No. 3752326, Japanese Patent Publication No. 4-9922, Japanese Patent Application Publication No. 6-10827 and Japanese Patent Application Publication No. 2007 - The technique disclosed in the Publication No. 100317 uses a structure in which multiple components are common to a pump unit equipped with a swash plate operation part to reduce the excess discharge flow rate of the pump through load detection and reduce power consumption while stably controlling the pump. There is still room for improvement in terms of output

Method used

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no. 1 approach

[0028] Embodiments of the present invention will be described in detail below with reference to the drawings. From Figure 1 to Figure 15 It is a figure which shows 1st Embodiment of this invention. Such as figure 1 As shown, a backhoe 10 as a work vehicle including a pump unit according to the present embodiment includes a traveling device 12 including a pair of left and right crawlers, a turntable 14 disposed at the center of the traveling device 12 , and a The rotary motor 16 and the rotating shaft O ( figure 2 ) as the center and is rotatably installed on the upper side of the running gear 12, that is, the upper structure 18. The pump unit of the present invention is not limited to a structure mounted on such a backhoe 10 and can be used in a device including a motor driven by a working fluid such as working oil and various actuators. For example, the pump unit according to the present invention can also be mounted on a work vehicle such as an agricultural tractor in ...

no. 2 approach

[0094] Figure 16 It is a hydraulic circuit diagram of the pump unit 24 related to the second embodiment of the present invention. In this embodiment, with the above Figure 4 Different from the first embodiment shown by Etc., the fourth pressure-receiving chamber 198 constituting each balance piston mechanism 94, 98 is connected to the oil tank 110; the third pressure-receiving chamber 202 constituting each balance piston mechanism 94, 98 is respectively connected to the corresponding The variable control pressure reducing valve is the secondary side of the variable pressure reducing valve 114 . Usually, the variable pressure reducing valve 114 is controlled to switch between the actuator switching valves, ie, the directional switching valves 26a, 26b (refer to image 3 ) is equivalent to the preset set pressure ΔP of the operating oil differential pressure generated before and after passing through the directional switching valves 26a and 26b LS It is introduced into the ...

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Abstract

A pump unit includes a variable capacity pump, and a balanced piston mechanism having a piston body, connected to an operation section of a variable swash plate, provided inside a cylinder, capable of sliding in an axial direction. The balanced piston mechanism has first, second and third pressure receiving chambers provided in the cylinder. Primary side and the secondary side working fluid pressures of an actuator switching valve are respectively introduced to the first receive pressure chamber and the second pressure receiving chamber, and a set pressure that has been previously set, corresponding to a working fluid differential pressure arising before and after passing through the actuator switching valve, in a steady state of the operating position of the actuator switching valve is introduced to the third pressure receiving chamber.

Description

technical field [0001] The present invention relates to a pump unit, for example, a pump unit used in an excavator using a bucket or the like, a vehicle equipped with a hydraulic drive device that relies on a hydraulic motor, a construction machine, or an agricultural tractor, and other ground-working vehicles. Equipped with a variable displacement pump and a balanced piston mechanism including a piston main body slidably provided in the axial direction within a hydraulic cylinder. Background technique [0002] In the past, for example, in a backhoe as a ground-working vehicle, the excavating part including the arm, the boom, the bucket, and the teeth are installed on the upper structure as the rotating part, and the hydraulic pressure is used to activate the hydraulic cylinder or the like. The excavation unit is operated by the actuator to perform excavation work. For example, Japanese Patent Application Laid-Open No. 2000-319942 describes a backhoe including a hydraulic o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04B53/00
CPCF04B1/22F04B1/324F15B13/0402E02F9/2232F04B49/08F15B11/165F04B49/002E02F9/22F15B11/00
Inventor 小和田七洋兼述秀树坂田浩二冈崎武史
Owner KANZAKI KOKYUKOKI MFG