Shaft valve flow distribution cycloid hydraulic motor

Abstract

The invention relates to a shaft valve flow distribution cycloid hydraulic motor and belongs to the technical field of hydraulic transmission detection. The motor comprises a front cover and a body shell which are connected with each other, and a cycloid pin wheel pair composed of a stator and a rotor, wherein one end of the cycloid pin wheel pair is fixedly connected with the body shell by a separation disc and the other end of the cycloid pin wheel pair is fixedly connected with a rear cover; the body shell is internally provided with an output shaft extended by the outer end; the output shaft is in transmission connection with the rotor by a linking shaft. The improvement is as follows: an inner hole of the body shell is a through hole with the same inner diameter; a front needle bearing and a rear needle bearing which have the same outer diameter are arranged on the front part and the rear end of the output shaft respectively; the length of the front needle bearing is longer than that of the rear needle bearing; a shaft shoulder, which corresponds to the front end of the front needle bearing, of the output shaft is abutted against a rear retainer ring of a plane thrust bearing. According to the shaft valve flow distribution cycloid hydraulic motor, under the precondition of keeping a compact structure, the radial bearing capability of the hydraulic motor is improved, the axial bearing capability is also enhanced and the machining and assembling manufacturability is good.

Description

technical field [0001] The invention relates to a hydraulic motor, in particular to a shaft valve distribution cycloid hydraulic motor, which belongs to the technical field of hydraulic transmission detection. Background technique [0002] The cycloidal hydraulic motor is a low-speed high-torque motor, which has the advantages of small size, high unit power density, high efficiency, and wide speed range, so it has been widely used. [0003] The basic structure of the cycloidal hydraulic motor is that the body shell or the back cover is equipped with a liquid inlet and a return port, and one end is equipped with a cycloidal pinwheel meshing pair and a flow distribution mechanism. The flow distribution mechanism can be placed before or after the cycloidal pinwheel meshing pair , generally the front one is the shaft valve distribution, the rear one is the plane distribution, and the other end is equipped with the output shaft. The rotor of the cycloid pinwheel meshing pair mes...

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Problems solved by technology

[0005] As far as the applicant knows, the existing compact shaft valve distribution cycloidal hydraulic motors (such as BM1, BMP, and BMR products produced by the applicant) are developing rapidly, although the sliding bearings of the distribution mechanism in the prior art hydraulic motors can withstand a certain diameter. radial force, but due to its structural limitations, it is not suitable for driving external gears, sprockets or directly driving large radial forces, even if radial needle bearings or ball bearings are added (such as Chinese patent CN200720041824. Radial needle roller bearings with inconsistent dimensions are supported, CN201220454428.X adopts the front end of the output shaft to install ball bearings to withstand radial force), the ability to withstand large radial forces is still difficult to be significantly improved, and may cause increased leakage

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