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Piston unit

A technology of piston and radial piston engine, applied in the direction of piston, tubular piston, reciprocating piston engine, etc., to maximize the unloading force and improve the starting efficiency.

Inactive Publication Date: 2013-08-14
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The last-mentioned disadvantage of the piston unit is the technical expenditure of the device in order to reduce the Hertzian stresses

Method used

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Examples

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Embodiment Construction

[0026] figure 1 A cutaway side view of a radial piston machine with a first exemplary embodiment of a piston unit 14 , 16 , 10 according to the invention is shown. The radial piston machine has an annular, undulating stroke cam 1 and eight cylinders 6, 8 with corresponding piston units 14, 16, 10, wherein in figure 1 Only three cylinders are shown in full and the other two cylinders are partially shown in . The cylinders 6 , 8 are arranged radially or star-shaped in the rotor 2 , while the travel cam 1 is formed on a disc cam 4 . The rotor 2 and the disc cam 4 are rotatable relative to each other. A radial piston machine of the type shown is usually used as a hydraulic motor, wherein the rotor can be fixed via a shaft 5 or a travel cam to the element to be driven.

[0027] Each cylinder 6 , 8 has a main section 6 and, on its side facing the shaft 5 , a radially stepped guide section 8 .

[0028] Each piston unit 14 , 16 , 10 has a roller 10 which, when the rotor 2 rotates,...

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Abstract

The invention relates to a piston unit for a radial piston machine, comprising a piston and a roller or a roller element, the roller or roller element having a circular cylindrical jacket, apart from a chamfer or the like. In a contact area between the piston and the roller, a hydrostatic pressure- or force-relief element is provided, which forms a pressure field in said contact area. The roller has one or two end-face holes. Due to said hole(s), the roller is slightly weakened at the associated end section so that the Hertzian stress is reduced there.

Description

technical field [0001] The invention relates to a piston unit for a radial piston machine according to the preamble of claim 1 , said piston unit comprising a piston and a roller. Background technique [0002] Various assembly methods (Ansatz) are known for piston units for radial piston machines. [0003] Document DE 40 37 455 C1 shows a radial piston machine with a plurality of cylinders arranged in a star shape in a rotor. Each cylinder is equipped with a piston unit. The piston unit has a multistage piston which is supported radially outwards via corresponding rollers on travel cams of the radial piston machine. Since the stroke cam is designed as a stator and has a wave shape, an oscillating stroke movement of the multistage piston is carried out for the rotating rotor. The roller is cylindrical over its entire length. [0004] A disadvantage of such piston units is the friction that occurs between the multistage pistons and the associated rollers. Furthermore, suc...

Claims

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Application Information

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IPC IPC(8): F04B1/107F01B13/06F04B1/04
CPCF04B1/0408F16J1/00F04B1/1071
Inventor P·纳格尔D·布罗伊尔G·克莫德K·蒂巴里
Owner ROBERT BOSCH GMBH
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