Sealing structure of a non-circular planetary gear emulsion motor

Abstract

The present invention discloses a sealing structure of a non-circular planetary gear emulsion motor, which includes a motor housing, a front oil pan, a rear oil pan and two sealing grooves on the circumferential surface of the oil pan. An inlet port and a drain port are arranged between the two sealing grooves, and an O-ring is arranged in the sealing groove. The outer diameter of the front oil pan and the outer diameter of the rear oil pan before the inlet port are smaller than the outer diameter of the rear oil pan after the inlet port. The inner diameter of the motor housing before the inlet port is smaller than the inner diameter of the motor housing after the inlet port. The O-ring in the sealing groove at the front end of the drain port on the front oil pan is in contact with and seals the inner hole surface and the inner hole end face of the motor housing at the same time. It effectively solves the technical problem of leakage of the emulsion motor, significantly improves the motor efficiency. At the same time, the assembly process of the emulsion motor is improved, the assembly is more convenient, and the assembly efficiency of the emulsion motor is significantly improved.

Description

Technical Field

[0001] The present invention relates to a hydraulic tool for coal mining and excavation, and more particularly to a sealing structure of a non-circular planetary gear emulsion motor. Background Art

[0002] The non-circular planetary gear emulsion motor combines non-circular planetary gear technology with hydraulic motor technology, and is a new type of low-speed high-torque hydraulic motor. The non-circular planetary gear emulsion motor uses emulsion as the working medium, and has the characteristics of low speed, large output torque, directly driving the load without a speed reduction device, unrestricted use occasions, compact structure, energy conservation and environmental protection. In particular, it does not generate electric sparks itself and there is no risk of electric leakage when operating in a humid environment. Therefore, it is widely used in coal mining and excavation work and is an upgraded product to replace traditional hydraulic motors. At present, for the existing emulsion motors, rubber sealing rings are used to seal between the motor housing and the front and rear oil pans. There are liquid inlet and drain ports on the motor housing. During assembly, the ends of the liquid inlet and drain ports often scratch the O-ring, resulting in sealing failure, large amount of emulsion leakage, insufficient power of the emulsion motor and reduced efficiency. Summary of the Invention

[0003] In order to solve the problems existing in the above technology, the present invention provides a sealing structure of a non-circular planetary gear emulsion motor with reliable sealing.

[0004] The present invention is achieved by the following technical solutions: A sealing structure of a non-circular planetary gear emulsion motor includes a motor housing, a front oil pan, a rear oil pan and two sealing grooves on the circumferential surface of the oil pan. A liquid inlet and a drain port are arranged between the two sealing grooves. O-rings are arranged in the sealing grooves. The outer diameter of the front oil pan and the outer diameter of the rear oil pan before the liquid inlet are smaller than the outer diameter of the rear oil pan after the liquid inlet. The inner diameter of the motor housing before the liquid inlet is smaller than the inner diameter of the motor housing after the liquid inlet, and the inner diameter of the motor housing matches the outer diameter of the oil pan.

[0005] In the above solution, the sealing groove at the front end of the drain port on the front oil pan is set as an open stepped shaft structure, so that the O-ring in the sealing groove is in contact with the inner hole surface and the inner hole end surface of the motor housing for sealing at the same time.

[0006] In the above solution, the width of the sealing groove at the front end of the drain port on the front oil pan is greater than the width of the sealing groove at the rear end of the drain port on the front oil pan, and the depth of the sealing groove at the front end of the drain port on the front oil pan is less than the depth of the sealing groove at the rear end of the drain port on the front oil pan.

[0007] In the above solution, the cross-sectional diameter of the O-ring at the front end of the drain port on the front oil pan is greater than the cross-sectional diameters of the O-ring at the rear end of the drain port on the front oil pan and the O-ring on the rear oil pan.

[0008] Compared with the prior art, the beneficial effects of the sealing structure of the non-circular planetary gear emulsion motor of the present invention are as follows:

[0009] 1. The inner hole of the emulsion motor housing and the outer diameters of the front and rear oil pans are designed in a stepped structure, so that the O-ring seal will not be scratched by the hole mouth during assembly, ensuring the integrity of the seal ring and good sealing effect.

[0010] 2. This sealing structure effectively solves the leakage problem of the emulsion motor, and the motor efficiency is significantly improved.

[0011] 3. The assembly process of the emulsion motor is improved, and the assembly is more convenient, significantly improving the assembly efficiency of the emulsion motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic structural diagram of the sealing structure of the non-circular planetary gear emulsion motor of the present invention.

[0013] In the figure: 1. Motor housing, 2. Rear oil pan, 3. Rear oil pan O-ring seal Ⅰ, 4. Liquid inlet, 5. Rear oil pan O-ring seal Ⅱ, 6. Front oil pan O-ring seal Ⅰ, 7. Liquid discharge port, 8. Front oil pan O-ring seal Ⅱ, 9. Step shaft, 10. Front oil pan. DETAILED DESCRIPTION OF THE INVENTION

[0014] The following Figure 1 further describes the sealing structure of the non-circular planetary gear emulsion motor of the present invention in combination with

[0015] Figure 1It is a structural schematic diagram of the sealing structure of the non-circular planetary gear emulsion motor of the present invention. In the figure, the sealing structure of the non-circular planetary gear emulsion motor includes a motor housing 1, a front oil pan 10, a rear oil pan 2, and two sealing grooves on the circumferential surface of the oil pan. An inlet port 4 and a drain port 7 are arranged between the two sealing grooves. The outer diameter of the front oil pan 10 and the outer diameter of the rear oil pan 2 before the inlet port are smaller than the outer diameter of the rear oil pan after the inlet port. The inner hole diameter of the motor housing 1 before the inlet port is smaller than the inner hole diameter of the motor housing after the inlet port, and the inner hole diameter of the motor housing matches the outer diameter of the oil pan. The sealing groove at the front end of the drain port 7 on the front oil pan 10 is set as an open stepped shaft structure, so that the O-ring seal II 8 of the front oil pan in the sealing groove is in contact with the inner hole surface and the inner hole end face of the motor housing 1 for simultaneous sealing. The width of the sealing groove at the front end of the drain port on the front oil pan is greater than the width of the sealing groove at the rear end of the drain port on the front oil pan, and the depth of the sealing groove at the front end of the drain port on the front oil pan is less than the depth of the sealing groove at the rear end of the drain port on the front oil pan. That is to say, the outer diameters of the O-ring seal II 5 of the rear oil pan, the O-ring seal I 6 of the front oil pan, and the O-ring seal II 8 of the front oil pan are smaller than the outer diameter of the O-ring seal I 3 of the rear oil pan, forming a stepped shape. In this way, during assembly, the O-ring seal II 5 of the rear oil pan, the O-ring seal I 6 of the front oil pan, and the O-ring seal II 8 of the front oil pan will not be scratched on the surface by the inlet port 4. The cross-sectional diameter of the O-ring seal II 8 of the front oil pan is increased, and at the same time, axial and radial sealing are carried out, effectively solving the technical problem of leakage of the emulsion motor, significantly improving the motor efficiency. At the same time, the assembly process of the emulsion motor is improved, and the assembly is more convenient, significantly improving the assembly efficiency of the emulsion motor.

[0016] The above is only a preferred embodiment of the present invention, and it does not impose any form of limitation on the present invention. Although the present invention has been disclosed above with a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications within the scope of the technical solution of the present invention to make equivalent embodiments of equivalent changes. However, as long as it does not depart from the content of the technical solution of the present invention, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A sealing structure of a non-circular planetary gear emulsion motor, comprising a motor housing, a front oil pan, a rear oil pan and two sealing grooves on the circumferential surface of the oil pan. An inlet port and a drain port are arranged between the two sealing grooves, and an O-ring is arranged in the sealing groove. It is characterized in that: The outer diameter of the front oil pan and the outer diameter before the liquid inlet of the rear oil pan are smaller than the outer diameter after the liquid inlet of the rear oil pan. The inner diameter of the motor housing before the liquid inlet is smaller than the inner diameter of the motor housing after the liquid inlet, and the inner diameter of the motor housing matches the outer diameter of the oil pan. The sealing groove at the front end of the drain port on the front oil pan is arranged as an open stepped shaft structure, so that the O-ring in the sealing groove is in contact with the inner surface and the inner end surface of the inner hole of the motor housing for simultaneous sealing. The width of the sealing groove at the front end of the drain port on the front oil pan is greater than the width of the sealing groove at the rear end of the drain port on the front oil pan, and the depth of the sealing groove at the front end of the drain port on the front oil pan is smaller than the depth of the sealing groove at the rear end of the drain port on the front oil pan. The cross-sectional diameter of the O-ring at the front end of the drain port on the front oil pan is greater than the cross-sectional diameter of the O-ring at the rear end of the drain port on the front oil pan and the O-ring on the rear oil pan.

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