Cycloidal Pinwheel Pair with Uniform Contact and One-tooth Difference

Abstract

Disclosed is a cycloidal pinwheel pair with uniform contact and one-tooth difference, comprising a stator and a rotor. Each gear tooth profile of the rotor has a modified recess provided symmetrically on both sides; the starting point (A) of the modified recess on one side of the gear tooth profile is located between a first point and a second point determined by locations of two limit positions, the end point (B) of the modified recess on the same side of the gear tooth profile is located between a third point and a fourth point determined by locations of two limit positions. By adopting the present disclosure, the internal leakage formed between high and low pressure chambers is effectively avoided, thereby significantly improving the volume efficiency and mechanical efficiency. Meanwhile, the present disclosure is extremely simple in structure and can be molded by one-time grinding with better manufacturability.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims priority to Chinese Application No. 201110378546.7, “Cycloidal Pinwheel Pair with Uniform Contact and One-tooth Difference”, filed on Nov. 24, 2011, which is hereby incorporated by reference in its entirety.TECHNICAL FIELD[0002]The present disclosure relates to a cycloidal pinwheel pair, and more particularly to a cycloidal pinwheel pair with uniform contact and one-tooth difference, belonging to the technical fields of cycloidal hydraulic motors and fully hydraulic diverters.BACKGROUND ART[0003]A cycloidal pinwheel pair with one-tooth difference has advantages such as compact structure, high kinematic precision, low noise, high tooth strength, strong bearing capacity, little junction surface friction, high transmission efficiency, higher power density, and so on. Therefore, it is widely used in products such as cycloid hydraulic motors with large torque and low speed, fully hydraulic diverters, cycloid pumps, and ...

AI Technical Summary

Benefits of technology

[0013]By adopting the present disclosure, in the transmission process, the adjacent high pressure chambers communicate with each other, and the adjacent low pressure chambers also communicate with each other, thereby forming a transition chamber between the high pressure chamber and the low pressure chamber to realize pressure transition. Since the present disclosure adopts the modified recess to replace the conventional clearance designed for error compensation, the internal leakage formed between high and low pressure chambers is effectively avoided, thereby significantly improving the volume efficiency and mechanical efficiency. Meanwhile, the present disclosure is extremely simple in structure and can be molded by one-time grinding with better manufacturability. Moreover, at the meshing clearance generated by the modified recess on the high pressure chamber and on the low pressure chamber, oil film filled with hydraulic oil is formed, which is benefit for reducing the friction of the kinematic pair, improving the flexibility of the movement, and reducing the requirement of machining precision.

Problems solved by technology

However, since machining errors and position errors exist in mechanical parts, a certain clearance has to be reserved in design to compensate the errors afore-mentioned; therefore, every independent chamber is sealed by oil film in actual.

In situations of heavy load or large torque transmission, the above mentioned errors and the reserved clearance may cause internal leakage of the cycloidal meshing pair (such as the hydraulic motor), which significantly affects the working stability of hydraulic equipment such as the hydraulic motor, and reduces the volume efficiency and mechanical efficiency.

However, this technical solution employs too many concave segments, as a result, it is complex in structure, tedious in design and calculation, and difficult to produce.

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