A Two-way Displacement Hydraulic Motor with Speed ​​Limiting Function

Abstract

The invention relates to a two-way displacement hydraulic motor with a speed limiting function. A speed limiting mechanism comprises a bypass valve, a lever mechanism and a speed limiting trigger mechanism, wherein one end of fifth and sixth oil ways on the bypass valve respectively communicate with a valve cavity through oil ports A and P, and the other ends of the fifth and sixth oil ways respectively communicate with two working ports of the motor; a spring is arranged between one end of a valve element and one end of the valve cavity, a sliding rod is connected to the other end of the valve element, the sliding rod passes through a valve body in a sliding mode, and then a roller I is assembled on the sliding rod; the lever mechanism comprises a lever which is hinged to a support blockand an ejector rod which is fixedly connected to the lever; the lever is abutted with the roller I; a roller II is installed on the lower end of the ejector rod; and the speed limiting trigger mechanism comprises three trigger units, the trigger units comprise special-shaped grooves formed in a cylinder body and spring cavities, fan-shaped blocks and reset springs are respectively assembled in thespecial-shaped grooves and the spring cavities, and both ends of the reset springs are fixedly connected with the bottoms of the fan-shaped blocks and the spring cavities respectively. The speed of the motor can be limited above or at the maximum speed limit, so that the service life of the motor can be prolonged.

Description

technical field [0001] The invention relates to a hydraulic motor, in particular to a two-way displacement hydraulic motor with a speed limiting function, belonging to the technical field of hydraulic pressure. Background technique [0002] Common hydraulic motors can be divided into gear type, vane type and plunger type according to the structural form. According to the positional relationship between the plunger and the transmission shaft, the plunger motor can be divided into two types: radial and axial. In practical applications, axial piston motors are mostly used. Hydraulic motors generally have two main working oil ports. When one port enters high-pressure oil and the other port discharges oil, the output shaft of the motor rotates in one direction. Change the oil inlet and outlet ports, and the motor rotates in the other direction. If a hydraulic motor can change the rotation direction of the output shaft without changing the oil inlet and outlet, it is called a t...

AI Technical Summary

Problems solved by technology

[0005] According to the calculation formula of the hydraulic motor speed n=Q / V (Q is the flow rate of the hydraulic motor, V is the displacement of the hydraulic motor), if the displacement of the hydraulic motor is kept constant, the displacement will be reduced. The speed of the hydraulic motor increases. If you want to change the direction of rotation of the hydraulic motor, you must go through the process of the motor displacement changing from large to small, passing through zero displacement, and then increasing the displacement. Therefore, no matter how small the flow rate is, when the motor displacement is very small Hours, the speed of the motor will be extremely high, which will inevitably lead to a rapid increase in the centrifugal force of the motor rotating components, resulting in a rapid increase in the relative motion speed of several friction pairs such as the plunger and the cylinder block, and increased wear and tear, exceeding the motor parts. physical limit, causing damage to the motor

[0006] In the prior art, the flow of the motor is mostly cut off completely through the switching of the reversing valve, so that it stops rotating, and when the motor is stationary, its displacement is adjusted to the reverse direction, and then the oil circuit is connected to make it rotate in the reverse direction. This is easy to cause shocks to the motor. In addition, the control program is more complicated; and if the reverse variable operation is performed on the motor without cutting off the flow of the motor, it is easy to cause damage to the motor and even cause a safety accident to the equipment.

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