Combined stator cycloid motor

Abstract

The present invention discloses a combined stator cycloidal motor, comprising a body, an output shaft is arranged in the body, one end of the output shaft extends out of the body, and the other end thereof is provided with an oil distribution sleeve, the oil distribution sleeve and the output shaft are separately arranged, an oil distribution shaft is arranged between the oil distribution sleeve and the output shaft, a transmission shaft is arranged outside the oil distribution shaft, an oil distribution tooth is arranged between one end of the oil distribution shaft and the output shaft, one end of the oil distribution shaft is connected to the output shaft through the oil distribution tooth, and the other end of the oil distribution shaft is movably connected to the oil distribution sleeve; a stator assembly is arranged outside the transmission shaft, the stator assembly is meshedly connected to the transmission shaft, a pressure difference oil chamber is arranged between the transmission shaft and the oil distribution shaft, the hydraulic oil in the pressure difference oil chamber drives the stator assembly to drive the transmission shaft to rotate through the pressure difference, and the rotation of the transmission shaft can drive the output shaft to rotate. The present invention effectively avoids the mutual influence of the output shaft and the oil distribution sleeve through the separate design of the oil distribution sleeve and the output shaft, thereby improving the working efficiency and stability of the cycloidal motor.

Description

Technical Field

[0001] The invention relates to the field of cycloidal motor manufacturing, in particular to a combined stator cycloidal motor. Background Art

[0002] The cycloid motor is a small, low-speed, high-torque hydraulic motor with an internal meshing cycloid gear. It has a simple structure, good low-speed performance, and strong short-term overload capacity. The cycloid motor has a stator and a movable cycloid wheel. The stator body, cycloid wheel and needle seat divide the motor into several chambers, each of which is connected to the oil chamber. When oil enters one oil port, oil exits the other. The incoming oil drives the cycloid wheel to rotate.

[0003] In the prior art, the output shaft and the oil distribution sleeve of the gerotor motor are an integral structure, which will affect each other during operation, so that when the motor output shaft is subjected to external load force, the oil distribution function of the oil distribution sleeve will be affected. Therefore, in the gerotor motor manufacturing field, it is urgent to eliminate the influence of the motor output shaft on the oil distribution sleeve to avoid the reduction of work quality and efficiency. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiency of the prior art that the oil distribution function of the oil distribution sleeve will be affected when the motor output shaft is subjected to an external load force, and to provide a combined stator cycloidal motor. Through the separate design of the oil distribution sleeve and the output shaft, the mutual influence between the output shaft and the oil distribution sleeve is effectively avoided, thereby improving the working efficiency and stability of the cycloidal motor.

[0005] The purpose of the present invention is mainly achieved through the following technical solutions:

[0006] A combined stator cycloidal motor comprises a body, an output shaft is arranged in the body, one end of the output shaft extends out of the body, and the other end thereof is provided with an oil distribution sleeve, the oil distribution sleeve and the output shaft are separately arranged, an oil distribution shaft is arranged between the oil distribution sleeve and the output shaft, a transmission shaft is arranged outside the oil distribution shaft, an oil distribution tooth is arranged between one end of the oil distribution shaft and the output shaft, one end of the oil distribution shaft is connected to the output shaft through the oil distribution tooth, and the other end of the oil distribution shaft is movably connected to the oil distribution sleeve;

[0007] A stator assembly is disposed outside the transmission shaft, and the stator assembly is meshed with the transmission shaft. A pressure difference oil chamber is provided between the transmission shaft and the oil distribution shaft. The hydraulic oil in the pressure difference oil chamber drives the stator assembly to rotate the transmission shaft through the pressure difference, and the rotation of the transmission shaft can drive the output shaft to rotate.

[0008] In the prior art, when subjected to external load force, the functions of the oil distribution sleeve and the output shaft will affect each other. Since the oil distribution sleeve and the output shaft are integral, they can play both the output function and the oil distribution function. When running at high speed and high pressure, the output shaft may tilt, and there is a gap between the oil distribution sleeve and the body, and the size of the gap is limited. Therefore, when the output shaft tilts, one side of the gap between the oil distribution sleeve and the body will be compressed, resulting in abnormal wear of the oil distribution sleeve. When the gap on one side is compressed, the gap on the other side will expand. The expanded gap will increase the leakage of hydraulic oil, thereby affecting the normal operation of the oil distribution sleeve. When the oil distribution sleeve is worn, it will cause the oil distribution function to be disordered. Since such mutual influence occurs under most working conditions, the prior art cannot effectively speed up and pressurize the rotation of the output shaft, resulting in the cycloidal motors in the prior art being usually medium-low speed and low-pressure motors, because their stability will be seriously affected after acceleration and pressurization.

[0009] In the present invention, the output shaft and the oil distribution sleeve are arranged separately, so that the mutual influence between the output shaft and the oil distribution sleeve is effectively eliminated, so that the output shaft will not affect the oil distribution function of the oil distribution sleeve when it is subjected to an external load force. In the present invention, the connection between the output shaft and the oil distribution sleeve is stable through the oil distribution shaft. The transmission shaft sleeve is arranged outside the oil distribution shaft, and the pressure difference of the hydraulic oil in the pressure difference oil chamber can effectively drive the transmission shaft to rotate, so that the transmission shaft can drive the output shaft to rotate. Since the process of generating the driving force through the pressure difference of the hydraulic oil is independent of the oil distribution sleeve, the oil distribution sleeve will not be affected by the output shaft, so that the oil distribution function can be stably completed. Since the output shaft eliminates the influence of the oil distribution sleeve, it can also increase the pressure difference of the pressure difference oil chamber. The increase in pressure difference can increase the torque of the output shaft. On this basis, the flow rate is increased. The purpose of accelerating the rotation of the output shaft is achieved, so that the rotation speed of the transmission shaft can be effectively enhanced by the change of flow rate, thereby improving the rotation speed of the cycloidal motor in the present invention. The cycloidal motor can stably and effectively realize high-speed operation. The transmission shaft can enhance stability through the stator assembly, so that the rotation of the output shaft can be more stable through the stator assembly. The stator assembly in the present invention adopts a split stator assembly; the present invention eliminates the mutual influence between the output shaft and the oil distribution sleeve when subjected to external load force by arranging an oil distribution shaft and a transmission shaft between the output shaft and the oil distribution sleeve, so that the oil distribution function of the oil distribution sleeve is not restricted, and the output shaft can increase the torque of the output shaft by increasing the pressure difference of the hydraulic oil in the pressure difference oil chamber under the premise that the oil distribution sleeve is not restricted, and on this basis, the flow rate is increased to effectively increase the rotation speed of the output shaft, thereby improving the working efficiency and stability of the cycloidal motor.

[0010] Furthermore, a needle roller bearing is sleeved on the output shaft, the outer side of the needle roller bearing is clearance-matched with the machine body, and the inner side of the needle roller bearing is clearance-matched with the output shaft.

[0011] Needle roller bearings are roller bearings with cylindrical rollers, which are thin and long relative to their diameter. Such rollers are called needle rollers. Since needle roller bearings convert friction into rolling friction, which is different from the original sliding friction, the friction force is reduced, which is more conducive to the rotational acceleration of the output shaft. The radial structure of the needle roller bearing is compact, and when its inner diameter size and load capacity are the same as those of other types of bearings, the outer diameter is the smallest. Since the radial installation size in the body is relatively limited, the support structure of the needle roller bearing in the present invention can effectively increase the speed of the output shaft without affecting the volume of the cycloidal motor.

[0012] Furthermore, an oil-free bearing is sleeved on the output shaft, the inner side of the oil-free bearing is clearance-matched with the output shaft, and the outer side of the oil-free bearing is fixed to the machine body.

[0013] Oil-free bearings are novel lubricating bearings that have the characteristics of both metal bearings and oil-free lubricating bearings. The metal matrix bears the load, and the specially formulated solid lubricating material acts as a lubricant. Oil-free bearings have the characteristics of high load-bearing capacity, impact resistance, high temperature resistance, and strong self-lubricating ability. In cycloid motors, they can effectively reduce friction, thereby allowing the motor to avoid seizure while increasing the output shaft rotation speed.

[0014] Furthermore, the oil distribution tooth is annular, the inner ring of the oil distribution tooth forms an inner hole, the end of the oil distribution shaft is meshed with the inner hole, a spline is provided on the outer ring of the oil distribution tooth, and the output shaft is provided with internal teeth, the spline is meshed with the internal teeth, and the oil distribution shaft can be linked to the output shaft through the oil distribution tooth.

[0015] In the present invention, the oil distribution tooth as an intermediate connecting piece can achieve the purpose of connecting the oil distribution shaft and the output shaft through the engagement of the inner hole with the oil distribution shaft and the engagement of the spline with the output shaft, thereby realizing the linkage of the oil distribution shaft and the output shaft.

[0016] Furthermore, the stator assembly includes a stator body, the stator body is provided with a plurality of grooves evenly distributed in the circumferential direction, the stator body is provided with a plurality of needle posts, the needle posts are evenly distributed in the circumferential direction, and the needle posts are partially embedded in the grooves;

[0017] A cycloid wheel is arranged in the stator body, the outer side surface of the cycloid wheel contacts the needle column, and the transmission shaft meshes with the cycloid wheel.

[0018] The stator assembly in the present invention is a split type. The split stator body assembly uses a needle column to replace the arc tooth shape of the original stator body in the integral stator body assembly. The needle column can rotate freely in the stator body, and the sliding friction pair of the original integral stator body assembly is changed to a rolling friction pair of the split stator body assembly, which reduces friction resistance, prolongs service life, and also increases the speed of the cycloid motor.

[0019] Furthermore, an oil drain chamber is provided between the oil distribution sleeve and the body, the oil drain chamber is connected to the oil return chamber, two built-in one-way valves are provided in the oil drain chamber, and the built-in one-way valves communicate the oil drain chamber with the oil return chamber;

[0020] The built-in one-way valve can guide the hydraulic oil in the oil drain chamber to flow from the oil drain chamber to the oil return chamber.

[0021] In the prior art, when the hydraulic motor is running, oil leakage will occur, and the leaked oil needs to be connected to the oil drain pipe to return to the oil tank. However, connecting the oil drain pipe will increase the volume of the entire equipment and will also create the risk of oil leakage. In the present invention, an oil drain chamber is set in the oil distribution sleeve, and the oil drain chamber and the oil return chamber are connected by setting a built-in one-way valve. The oil drain chamber and the oil return chamber can be connected by controlling the oil circuit to flow from the oil drain chamber to the oil return chamber. Since the hydraulic oil is in flow, the built-in one-way valve is set so that one end of the one-way valve is connected to the oil drain chamber, and the other end is connected to the oil return chamber, so that the motor leakage oil can flow to the oil return chamber through the one-way valve, thereby avoiding the layout of the oil drain pipe and making the external equipment layout of the cycloidal motor more compact. Therefore, when the motor in the present invention is not connected to the oil drain pipe, the built-in one-way valve can make the internal leakage oil of the motor flow to the oil return chamber through the one-way valve hole.

[0022] Furthermore, the built-in one-way valve includes a valve hole, a steel ball capable of blocking the valve hole is provided in the valve hole, and a retaining ring is provided between the steel ball and the valve hole.

[0023] The built-in one-way valve blocks the valve hole through the steel ball, thereby preventing the high-pressure oil from flowing into the oil leakage chamber of the motor, and the retaining ring can effectively play the role of limiting the steel ball.

[0024] In summary, the present invention has the following beneficial effects compared with the prior art:

[0025] (1) The present invention eliminates the mutual influence between the output shaft and the oil distribution sleeve when subjected to external load force by arranging an oil distribution shaft and a transmission shaft between the output shaft and the oil distribution sleeve, thereby ensuring that the oil distribution function of the oil distribution sleeve is not restricted. The output shaft can increase the torque of the output shaft by increasing the pressure difference of the hydraulic oil in the pressure difference oil chamber without restriction of the oil distribution sleeve, and on this basis, increase the flow rate to effectively increase the rotation speed of the output shaft, thereby improving the working efficiency and stability of the cycloidal motor.

[0026] (2) The present invention sets an oil drain chamber in the oil distribution sleeve, and connects the oil drain chamber and the oil return chamber by setting a built-in one-way valve. The oil drain chamber and the oil return chamber can be connected by controlling the oil circuit so that the oil flows from the oil drain chamber to the oil return chamber. Since the hydraulic oil is in flow, the built-in one-way valve is set so that one end of the one-way valve is connected to the oil drain chamber and the other end is connected to the oil return chamber, so that the motor leakage oil can flow to the oil return chamber through the one-way valve, thereby avoiding the layout of the oil drain pipe and making the external equipment layout of the cycloidal motor more compact. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0028] Figure 1 It is a schematic diagram of the structure of the present invention;

[0029] Figure 2 It is a schematic diagram of the structure of the stator assembly of the present invention;

[0030] Figure 3 It is a schematic diagram of the transmission shaft structure of the present invention;

[0031] Figure 4 This is the internal oil circuit diagram of the oil distribution sleeve of the present invention.

[0032] The reference numerals represent: 1-output shaft, 2-needle bearing, 3-oil-free bearing, 4-oil distribution shaft, 5-retaining ring, 6-steel ball, 7-hole valve, 8-oil distribution sleeve, 9-stator assembly, 91-stator body, 92-needle column, 93-cycloid wheel. DETAILED DESCRIPTION

[0033] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0034] Example:

[0035] like Figure 1-2 As shown,

[0036] A combined stator cycloidal motor comprises a body, an output shaft 1 is arranged in the body, one end of the output shaft 1 extends out of the body, and the other end thereof is provided with an oil distribution sleeve 8, the oil distribution sleeve 8 and the output shaft 1 are separately arranged, an oil distribution shaft 4 is arranged between the oil distribution sleeve 8 and the output shaft 1, a transmission shaft is arranged on the outer cover of the oil distribution shaft 4, an oil distribution tooth is arranged between one end of the oil distribution shaft 4 and the output shaft 1, one end of the oil distribution shaft 4 is connected to the output shaft 1 through the oil distribution tooth, and the other end of the oil distribution shaft 4 is movably connected to the oil distribution sleeve 8;

[0037] The transmission shaft outer sleeve is provided with a stator assembly 9, which is meshed with the transmission shaft. A pressure difference oil chamber is provided between the transmission shaft and the oil distribution shaft 4. The hydraulic oil in the pressure difference oil chamber drives the stator assembly 9 to rotate the transmission shaft through the pressure difference, and the rotation of the transmission shaft can drive the output shaft 1 to rotate.

[0038] In this embodiment, the mutual influence between the output shaft 1 and the oil distribution sleeve 8 is effectively eliminated by separating the output shaft 1 and the oil distribution sleeve 8, so that the output shaft 1 does not affect the oil distribution function of the oil distribution sleeve 8 when subjected to an external load. In this embodiment, the connection between the output shaft 1 and the oil distribution sleeve 8 is stable through the oil distribution shaft 8. The transmission shaft sleeve is arranged outside the oil distribution shaft 4. The pressure difference of the hydraulic oil in the pressure difference oil chamber can effectively push the stator assembly 9, thereby driving the transmission shaft to rotate, so that the transmission shaft can drive the output shaft 1 to rotate. Now it rotates, because the process in which the driving force is generated by the pressure difference of the hydraulic oil has nothing to do with the oil distribution sleeve 8, the oil distribution sleeve 8 will not be affected by the output shaft 1, so that the oil distribution function can be stably completed, and the output shaft 1 can also increase the pressure difference of the pressure difference oil chamber because the influence of the oil distribution sleeve 8 is eliminated. The larger the pressure difference, the greater the torque of the output shaft. On this basis, the flow rate is increased to achieve the purpose of accelerating the rotation of the output shaft, so that the speed of the output shaft 1 can be improved, thereby improving the speed of the cycloidal motor in the present invention, and the cycloidal motor can stably and effectively achieve high-speed operation.

[0039] A needle roller bearing 2 is sleeved on the output shaft 1 , the outer side of the needle roller bearing 2 is clearance-matched with the machine body, and the inner side of the needle roller bearing 2 is clearance-matched with the output shaft 1 .

[0040] An oil-free bearing 3 is sleeved on the output shaft 1 , the inner side of the oil-free bearing 3 is clearance-matched with the output shaft 1 , and the outer side of the oil-free bearing 3 is fixed to the machine body.

[0041] In this embodiment, the needle bearing 2 and the oil-free bearing 3 can effectively reduce the friction by changing the sliding friction into rolling friction, thereby achieving the purpose of allowing the output shaft 1 to rotate faster.

[0042] The oil distribution tooth is annular, and the inner ring of the oil distribution tooth forms an inner hole. The end of the oil distribution shaft 4 is meshed with the inner hole. A spline is provided on the outer ring of the oil distribution tooth, and the output shaft 1 is provided with an internal tooth. The spline is meshed with the internal tooth. The oil distribution shaft 4 can be linked with the output shaft 1 through the oil distribution tooth.

[0043] The transmission shaft outer sleeve is provided with a stator assembly 9, and the stator assembly 9 is meshingly connected with the transmission shaft.

[0044] The stator assembly 9 includes a stator body 91, wherein the stator body 91 is provided with a plurality of grooves evenly distributed in the circumferential direction, wherein the stator body 91 is provided with a plurality of needle posts 92, wherein the needle posts 92 are evenly distributed in the circumferential direction, and wherein the needle posts 92 are partially embedded in the grooves;

[0045] A cycloid wheel 93 is disposed in the stator body 91 . The outer side surface of the cycloid wheel 93 contacts the needle column 92 , and the transmission shaft meshes with the cycloid wheel 93 .

[0046] The pressure difference oil chamber in this embodiment specifically refers to the pressure difference oil chamber located at the stator assembly.

[0047] An oil drain chamber is provided between the oil distribution sleeve 8 and the body, the oil drain chamber is connected to the oil return chamber, two built-in one-way valves are provided in the oil drain chamber, and the built-in one-way valves connect the oil drain chamber and the oil return chamber;

[0048] The built-in one-way valve can guide the hydraulic oil in the oil drain chamber to flow from the oil drain chamber to the oil return chamber.

[0049] The built-in one-way valve comprises a valve hole 7 , in which a steel ball 6 capable of blocking the valve hole 7 is arranged, and a retaining ring 5 is arranged between the steel ball 6 and the valve hole 7 .

[0050] In this embodiment, the stator assembly 9 is a modular type. The modular stator assembly 9 replaces the arc tooth shape of the original stator body in the integral stator assembly 9 with a needle column 92. The needle column 92 can rotate freely in the stator body 91, and the sliding friction pair of the original integral stator body assembly is changed to a rolling friction pair of the modular stator assembly 9, which reduces friction resistance, prolongs service life, and also increases the speed of the cycloid motor.

[0051] In this embodiment, an oil drain chamber is set in the oil distribution sleeve 8, and the oil drain chamber and the oil return chamber are connected by setting a built-in one-way valve. The oil drain chamber and the oil return chamber can be connected by controlling the oil circuit so that the oil flows from the oil drain chamber to the oil return chamber. Since the hydraulic oil is in flow, the built-in one-way valve is set so that one end of the one-way valve is connected to the oil drain chamber, and the other end is connected to the oil return chamber, so that the motor leakage oil can flow to the oil return chamber through the one-way valve, thereby avoiding the layout of the oil drain pipe and making the external equipment layout of the cycloid motor more compact. Therefore, when the motor in this embodiment is not connected to the oil drain pipe, the built-in one-way valve can make the internal leakage oil of the motor flow to the oil return chamber through the one-way valve hole.

[0052] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A combined stator cycloidal motor, comprising a body, wherein an output shaft (1) is arranged in the body, one end of the output shaft (1) extends out of the body, and the other end of the output shaft (1) is provided with an oil distribution sleeve (8), characterized in that: The oil distribution sleeve (8) and the output shaft (1) are arranged separately, an oil distribution shaft (4) is arranged between the oil distribution sleeve (8) and the output shaft (1), a transmission shaft is arranged on the outer sleeve of the oil distribution shaft (4), an oil distribution tooth is arranged between one end of the oil distribution shaft (4) and the output shaft (1), one end of the oil distribution shaft (4) is connected to the output shaft (1) via the oil distribution tooth, and the other end of the oil distribution shaft (4) is movably connected to the oil distribution sleeve (8); The outer sleeve of the transmission shaft is provided with a stator assembly (9), the stator assembly (9) is meshingly connected with the transmission shaft, a pressure difference oil chamber is provided between the transmission shaft and the oil distribution shaft (4), the hydraulic oil in the pressure difference oil chamber drives the stator assembly to drive the transmission shaft to rotate through the pressure difference, and the rotation of the transmission shaft can drive the output shaft (1) to rotate; The stator assembly (9) comprises a stator body (91), wherein a plurality of grooves evenly distributed in the circumferential direction are provided in the stator body (91), and a plurality of needle posts (92) are provided in the stator body (91), wherein the needle posts (92) are evenly distributed in the circumferential direction, and the needle posts (92) are partially embedded in the grooves; A cycloid wheel (93) is provided in the stator body (91), the outer side surface of the cycloid wheel (93) is in contact with the needle column (92), and the transmission shaft is meshed with the cycloid wheel (93).

2. A combined stator cycloid motor according to claim 1, characterized in that: A needle roller bearing (2) is sleeved on the output shaft (1), the outer side of the needle roller bearing (2) being in clearance fit with the machine body, and the inner side of the needle roller bearing (2) being in clearance fit with the output shaft (1).

3. A combined stator cycloid motor according to claim 1 or 2, characterized in that: An oil-free bearing (3) is sleeved on the output shaft (1); the inner side of the oil-free bearing (3) is clearance-matched with the output shaft (1), and the outer side of the oil-free bearing (3) is fixed to the machine body.

4. The combined stator cycloid motor according to claim 1, characterized in that: The oil distribution tooth is annular, the inner ring of the oil distribution tooth forms an inner hole, the end of the oil distribution shaft (4) meshes with the inner hole, a spline is provided on the outer ring of the oil distribution tooth, the output shaft (1) is provided with an inner tooth, the spline meshes with the inner tooth, and the oil distribution shaft (4) can be linked to the output shaft (1) through the oil distribution tooth.

5. The combined stator cycloid motor according to claim 1, characterized in that: An oil drain chamber is provided between the oil distribution sleeve (8) and the machine body, the oil drain chamber is connected to the oil return chamber, two built-in one-way valves are provided in the oil drain chamber, the built-in one-way valves communicate the oil drain chamber with the oil return chamber; The built-in one-way valve can guide the hydraulic oil in the oil drain chamber to flow from the oil drain chamber to the oil return chamber.

6. A combined stator cycloid motor according to claim 5, characterized in that: The built-in one-way valve comprises a valve hole (7), a steel ball (6) capable of blocking the valve hole (7) is arranged in the valve hole (7), and a retaining ring (5) is arranged between the steel ball (6) and the valve hole (7).

Images