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Closed circuit pump

一种封闭回路、切口的技术，应用在泵、用于弹性流体的泵送装置的部件、多缸泵等方向，能够解决噪音振动、未展示、产生气穴等问题，达到减轻泵噪音和振动的效果

Inactive Publication Date: 2017-08-08
KANZAKI KOKYUKOKI MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the cylinder block rotates, if high-pressure hydraulic fluid flows rapidly from the port on the discharge side into the hydraulic cylinder on the discharge side, cavitation occurs around the port, causing increased pump noise and vibration.
Above-mentioned Japanese Laid-Open Patent Application Laid-Open No. 2000-319942, Japanese Laid-Open Patent Application Laid-Open No. 10-169547, and Japanese Laid-Open Patent Application Laid-Open No. 2000-97146 do not show the above-mentioned disadvantages. means

Method used

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Embodiment Construction

[0033] Embodiments of the present invention will be described in detail below with reference to the drawings. From Figure 1 to Figure 9 It is a figure which shows an example of embodiment of this invention. Such as figure 1 As shown, a backhoe 10, which is a vehicle having an elevating transmission device including a pump for constituting a closed circuit according to an embodiment of the present invention, is provided with a running device 12 including a pair of left and right crawlers, and a vehicle mounted on the running device 12 rotatably. The turntable 14 on the upper side and the cockpit 16 installed on the upper side of the turntable 14 . The cockpit 16 includes operating units such as a driver's seat and an operating lever. An excavation machine 18 is attached to the upper portion of the turntable 14 and in front of the cab 16 . The excavator 18 includes a first boom 20 , a second boom 22 and a third boom 24 . The base of the first cantilever 20 is installed on ...

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Abstract

The multi-port pump assembly (70) has a cylinder seat (112) rotatably arranged in the casing (108) and has a plurality of hydraulic cylinders (122) and a valve plate (116) formed on the casing (108) multiple ports. Some of the ports are connected to the pressure chamber of the boom hydraulic cylinder, and the remaining ports are connected to the oil tank. At the end of the opening end of each port, that is, the end of the same side of the cylinder block (112) in the rotation direction, a V-shaped groove that becomes smaller toward the front end is provided. The V-shaped groove set at the top dead center position of the piston and the V-shaped groove set at the bottom dead center position of the piston are made larger, and the V-shaped groove set at the position between the top dead center position and the bottom dead center position of the piston is made larger. Make it smaller.

Description

technical field [0001] The present invention relates to a pump for forming a closed circuit for selectively supplying and discharging operating oil to a pair of pressure chambers on both sides of a piston of a hydraulic transmission device. A closed circuit including a hydraulic transmission for a vehicle with a lifting transmission such as a ground working machine or an aerial ladder vehicle. Background technique [0002] In the past, excavators such as backhoes and other ground working machines installed excavators such as buckets or forks on the car body through cantilever or boom, etc., and the excavators were moved through hydraulic transmission devices such as hydraulic cylinders. for excavation work. For example, Japanese Patent Application Laid-Open No. 2000-319942 describes a backhoe as an excavator including a hydraulic operating device. [0003] In the case of the backhoe disclosed in Japanese Patent Application Laid-Open No. 2000-319942, a boom hydraulic cylind...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04B1/22F04B53/16
Inventor 坂田浩二小和田七洋
Owner KANZAKI KOKYUKOKI MFG
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