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Hydraulic pump for excavator and excavator comprising the same

a technology of hydraulic pump and excavating shaft, which is applied in the direction of pump components, positive displacement liquid engines, machines/engines, etc., can solve the problems of reducing the wear of the housing itself and prolonging the service life of the hydraulic pump, so as to reduce the vibration of the driving shaft, prolong the service life, and reduce the manufacturing cost

Inactive Publication Date: 2014-06-26
BOSCH REXROTH BEIJING HYDRAULIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention is about a hydraulic pump for an excavator that has a longer service life and lower manufacturing cost compared to existing pumps. The hydraulic pump has a unique design with a supporting wall, rotary hydraulic cylinders, and spindles connected by a coupler, which reduces vibration and improves efficiency. The sliding bearing and swash plate have a low noise and impact resistance, and the swash plate angle can be adjusted to control the piston stroke. An adapting bushing is used to mount the sliding bearing in the supporting wall, which reduces wear on the housing and improves the service life of the hydraulic pump.

Problems solved by technology

Accordingly, the sliding bearing is not directly mounted in the mounting hole of the supporting wall, but via the adapting bushing, which results in the wear to the housing itself being reduced and the service life of the hydraulic pump being prolonged.

Method used

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  • Hydraulic pump for excavator and excavator comprising the same
  • Hydraulic pump for excavator and excavator comprising the same
  • Hydraulic pump for excavator and excavator comprising the same

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Embodiment Construction

[0023]Illustrative embodiments of the invention will be described with reference to the drawings. It should be noted that same reference numbers throughout the drawings denote functionally and / or structurally identical elements or devices.

[0024]FIG. 1 shows an axial cross-sectional view of a hydraulic pump 1 according to one embodiment of the invention. The hydraulic pump according to the invention can be used in a mechanical device working in bad conditions, for example in an excavator.

[0025]As shown in FIG. 1, the hydraulic pump 1 comprises a housing 2 and end caps 3 and 4 mounted on opposite ends of the housing 2. Two spindles 5 and 6, two rotary hydraulic cylinders 9 and 10, and two swash plates 7 and 8 for driving the rotary hydraulic cylinders are provided in the housing 2. The swash plates 7 and 8 are configured for adjusting working strokes of the rotary hydraulic cylinders 9 and 10 respectively.

[0026]The two spindles 5 and 6 are disposed coaxially and are connected with eac...

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Abstract

A hydraulic pump for an excavator, which comprises a housing having a supporting wall extending therein; a pair of rotary hydraulic cylinders provided in the housing, each of the rotary hydraulic cylinders being provided with a piston which is movable reciprocatingly in the rotary hydraulic cylinder; and a pair of spindles disposed parallel to the rotary hydraulic cylinders, the spindles being connected with each other via a coupler and driving the rotary hydraulic cylinders to rotate about their respective central axes, each of the rotary hydraulic cylinders comprising a swash plate for receiving and guiding the piston, and the swash plate being stationary relative to the respective spindle, wherein the supporting wall comprises a mounting hole, and the coupler is supported in the mounting hole by means of a sliding bearing.

Description

TECHNICAL FIELD[0001]The present invention relates to a hydraulic pump, in particular to a hydraulic pump for an excavator, and to an excavator comprising the hydraulic pump.BACKGROUND ART[0002]A hydraulic pump used in an excavator generally comprises a housing and a pair of rotary hydraulic cylinders accommodated in the housing. The rotary hydraulic cylinders are disposed coaxially opposite to each other. A driving shaft is supported in the housing parallel to longitudinal axes of the rotary hydraulic cylinders. Two swath plates are mounted in the housing fixedly relative to the driving shaft. In the rotary hydraulic cylinder there is provided with a reciprocating piston. Each of the swash plates comprises a mating surface for receiving and guiding the piston. Each of the rotary hydraulic cylinders is driven to rotate about a central axis of the driving shaft, and thus the piston is driven to move reciprocatingly in the respective rotary hydraulic cylinder as the driving shaft rota...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F04B1/20F04B39/02F04B1/32
CPCF04B1/2071F04B1/324F04B1/22F04B1/20F04B39/0284
Inventor SCHARFFENBERG, RALFLIN, SHENG
Owner BOSCH REXROTH BEIJING HYDRAULIC
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