one Cycloid hydraulic motor Structure and working principle of
Cycloid of 6K series products Hydraulic motor It is an end face flow distribution and pressure supplement type, mainly composed of output shaft, front cover, rolling bearing, long coupling shaft, rolling bearing housing, stator and rotor pairs, valve disc, small linkage shaft, port plate and preload spring (see Figure 1). This type of hydraulic motor has the characteristics of slow speed and large torque.
The motor has a cycloidal rotor with 6 teeth, which is assembled between the stators and meshes with the stator with 7 arc teeth to form 7 sealing areas; Of the twelve holes on the port plate, six are interconnected with the oil inlet (return) port, and the other six are interconnected with the oil return (inlet) port. Seven holes on the valve disc assist the port plate and cycloidal rotor to form seven capacity cavities.
When the high pressure oil enters from the oil port, the high pressure oil in three adjacent chambers will be discharged. Let me pass 1 line to rotate. Technical exhibition: Gao Yu controls the cogging, Zhier loves the outgoing rotor, because the stator is fixed: the pendulum II rotates slowly around its axis, and at the same time, it also rotates around the stator
The core makes high-speed reverse revolution. When the cycloid rotor rotates along the stator during revolution, its oil suction and discharge cavity continuously changes, but it is always divided into two cavities by the boundary of two cores, that is, the high pressure cavity and the cogging are the ones whose cogging capacity continues to expand
Low voltage control is used when the capacity continues to decrease. The capacity of one tooth slot per 1tt realizes one time of entering and lubricating A1 teeth, that is, the cycloidal rotor rotates for one revolution only when it rotates for six revolutions,
The speed ratio of revolution to rotation is 6:1. When the cycloidal rotor rotates for 1 circle, the oil inlet and outlet of 42 cavities change. The port plate is driven by the small linkage shaft to rotate with the cycloidal rotor at the same time, realizing the continuous port distribution task, making the capacity of the high-pressure chamber continuously expand, and promoting the continuous rotation of the cycloidal rotor. The rotation force of cycloidal rotor is transmitted to the output shaft by the linkage shaft, so that the output shaft can rotate continuously and output torque.
2. Factors reducing the performance index of hydraulic motor
(1) Damaged condition of hydraulic motor
WTz-150 and WTZ-200 series product rigs are mainly equipped with 6K-195 and 6K-3102 models and specifications of hydraulic motors. According to the inspection, the friction surface between the valve disc and the port plate of the hydraulic motor is seriously damaged, with a depth of 0.15 mm; Oil leaks from the output shaft seal ring.
(2) Cause analysis of valve plate damage
According to the basic principle of this type of hydraulic motor, the port plate and cycloidal rotor are connected by a small linkage shaft and operate together, and the port plate moves on the valve plate. The causes of excessive damage of the friction pair are as follows:
When a new hydraulic motor was just assembled, the friction surface of the friction pair was damaged because the motor housing was not filled with hydraulic transmission oil. In particular, it carries heavy load in the early stage of operation, which further damages the valve plate.
The filter element failure of the hydraulic system causes the hydraulic transmission oil to infiltrate fine particle residues, and small fine particles enter the friction surface in the flow distribution back rotation process, causing abrasive damage to the friction surface.
Because the roughness of the damaged surface of the friction surface between the port plate and the valve plate is getting worse, the residual storage space between the friction pairs is expanded. The fine particles entering the friction surface and the metal material particles being milled work together with the port plate, aggravating the damage.
Because the roughness of the damaged surface of the friction surface between the port plate and the valve plate is getting worse, the residual storage space between the friction pairs is expanded. The fine particles entering the friction surface and the metal material particles being milled work together with the port plate, aggravating the damage.
Because of the damage between the port plate and the valve plate, the hydraulic transmission oil forms a gap between the oil inlet and return passages and is connected. Under the effect of high pressure, the sealing, cleaning, and heat dissipation characteristics of the hydraulic transmission oil are reduced, and the temperature is increased, adding to the damage.
