Valve bank for switching of series-parallel connection of multiple rationed hydraulic motors

Abstract

The invention relates to a valve bank for switching of series-parallel connection of multiple rationed hydraulic motors. The valve bank comprises a hydraulic manifold block, the rationed hydraulic motors and an oil tank. The hydraulic manifold block comprises an electro-hydraulic reversing valve. A first hydraulic fluid port of the hydraulic manifold block is connected with first hydraulic fluid ports of the first rationed hydraulic motor and the second rationed hydraulic motor which are connected in parallel. Second hydraulic manifold blocks of the first rationed hydraulic motor and the second rationed hydraulic motor are connected with a port T of the electro-hydraulic reversing valve. A port B of the electro-hydraulic reversing valve is connected with first hydraulic fluid ports of the third rationed hydraulic motor and the fourth rationed hydraulic motor which are connected in parallel. A port P of the electro-hydraulic reversing valve is connected with the first hydraulic fluid port of the hydraulic manifold block. A port A of the electro-hydraulic reversing valve is connected with a second hydraulic fluid port of the hydraulic manifold block. Second hydraulic fluid ports of the third rationed hydraulic motor and the fourth rationed hydraulic motor are connected with the second hydraulic fluid port of the hydraulic manifold block. By the valve bank, the problem about switching of series-parallel connection of the rationed hydraulic motors is solved, and speed and torque changes of the rationed motors are realized.

Description

technical field [0001] The invention relates to a valve group, in particular to a valve group used for series-parallel switching of multiple quantitative hydraulic motors. Background technique [0002] There are generally two ways to connect multiple hydraulic motors, one is parallel connection and the other is series connection. The hydraulic motors connected in parallel can output larger output torque, but the speed is low; the hydraulic motors connected in series can output higher speed, but the output torque is small; but in actual working conditions, the output torque is required to be large and the speed is low. There are two different working conditions with low output torque and high rotational speed. Usually, the solution to the problem is to use variable displacement hydraulic motors in parallel. The way to achieve low output torque and high speed is to reduce the displacement of the motor. However, the disadvantage of this method is that the variable displacement...

AI Technical Summary

Problems solved by technology

The hydraulic motors connected in parallel can output larger output torque, but the speed is low; the hydraulic motors connected in series can output higher speed, but the output torque is small; but in actual working conditions, the output torque is required to be large and the speed is low. Two different working conditions: low output torque and high speed

Usually, the solution to the problem is to use parallel connection of hydraulic motors with variable displacement. The way to achieve low output torque and high speed is to reduce the displacement of the motor. However, the disadvantage of this method is that the variable displacement motor is more expensive.

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