CN212376786U

CN212376786U - Axial flow distribution cycloid hydraulic motor

Info

Publication number: CN212376786U
Application number: CN202020973224.1U
Authority: CN
Inventors: 阮瑞勇; 柯贤胜
Original assignee: Jiangsu Guorui Hydraulic Pressure Machine Co ltd
Current assignee: Jiangsu Guorui Hydraulic Pressure Machine Co ltd
Priority date: 2020-06-01
Filing date: 2020-06-01
Publication date: 2021-01-19
Anticipated expiration: 2030-06-01

Abstract

The utility model discloses an axle distribution cycloid hydraulic motor, including casing and output shaft, outside the one end of output shaft extended out the casing, set up hole and radial groove in the casing, the output shaft passed the hole, and radial groove links to each other with the distribution pore, and the surface of output shaft sets up the distribution groove. The output shaft includes spindle nose, first axle body and second axle body, and first axle body links to each other with spindle nose, second axle body respectively, and the interval sets up first axle piece, second axle piece, third axle piece on the second axle body, and the second axle piece is opened the distribution groove to the second axle body by outside surface. The distribution groove is crescent. The utility model discloses when no journal bearing supports, can bear certain radial load and radial impact, overall structure is compact, can effectively reduce motor parts's machining precision, simplifies its lubricating system, optimizes its assembly precision, can effectively reduce the manufacturing cost of motor, improves its price/performance ratio, improves product competitiveness.

Description

Axial flow distribution cycloid hydraulic motor

Technical Field

The utility model belongs to the hydraulic transmission field specifically is an axle distribution cycloid hydraulic motor.

Background

The cycloid hydraulic motor is a device for converting hydraulic energy into mechanical energy, is a commonly used execution element of a hydraulic system, and is widely applied to the fields of engineering machinery, agricultural machinery and the like due to the characteristics of simple structure, small volume, large mass-to-work ratio, high efficiency and the like.

The matching section of the output shaft and the body shell of the existing axial flow distribution cycloid hydraulic motor requires high straightness accuracy of the flow distribution groove section of the output shaft in the axial direction due to the fact that the flow distribution accuracy is guaranteed. When the motor is in practical application, a certain radial load and radial impact need to be borne, and the flow distribution groove section on the output shaft is extremely easy to damage. To prevent such failures, it is necessary to install a radial bearing structural support to protect the output shaft. Chinese patent application No. CN201210329275.0 discloses that a single-row deep groove ball bearing for bearing radial force is installed at the front end of an output shaft, and an additional bearing supporting space is added, which brings about improvement of manufacturing accuracy of motor parts, and the requirement of installation accuracy is higher, and at the same time, an additional lubricating system is required to be designed for the bearing structure, which all increase the cost of the whole motor. Chinese patent application No. CN201210329200.2 discloses that two single-row deep groove ball bearings bearing radial force are installed at the front end of the output shaft, which results in that an extra bearing supporting space is added inside the original compact motor, which brings about improvement of manufacturing precision of motor parts, the requirement of installation precision is higher, and at the same time, an extra lubricating system for bearing structural design is required, which all increases the cost of the whole motor.

SUMMERY OF THE UTILITY MODEL

The purpose of the invention is as follows: in order to overcome the not enough of existence among the prior art, the utility model aims at providing a no radial bearing supports, can bear radial impact, reduce the part machining precision, simplify lubricating system, low in manufacturing cost's axle distribution cycloid hydraulic motor.

The technical scheme is as follows: a shaft distribution cycloid hydraulic motor, including casing and output shaft, outside the one end of output shaft extended out the casing, set up hole and radial groove in the casing, the output shaft passed the hole, radial groove and distribution pore link to each other, the distribution groove is set up on the surface of output shaft, distribution groove and the radial groove in the casing, distribution pore constitute the distribution system jointly, realize that hydraulic motor lasts moving distribution function.

The output shaft includes spindle nose, first axle body and second axle body, and first axle body links to each other with spindle nose, second axle body respectively, and the interval sets up first axle piece, second axle piece, third axle piece on the second axle body, and the second axle piece is opened the distribution groove to the second axle body by outside surface. The distribution groove is crescent, can slow down the impact of fluid to the part surface, reduces the loss of energy, can effectively reduce the loss of pressure of fluid, improves the mechanical efficiency of motor. The distribution groove sequentially extends to the first shaft block and the third shaft block along the axial direction of the second shaft body. The outer surface of the first shaft block along the axial direction is arc-shaped. The outer surface of the second shaft block along the axial direction is arc-shaped. The outer surface of the third shaft block along the axial direction is arc-shaped. The difference between the highest point and the lowest point of the arc shape is less than or equal to 0.015mm and more than 0.015mm, so that the fit clearance between the shaft and the shell is overlarge, internal leakage is caused, and the volumetric efficiency of the motor is reduced.

The output shaft is connected with the stator and rotor pair. Through oil film theoretical calculation and experimental test demonstration, the fit clearance between the highest point of the excircle of the output shaft and the inner hole is 0.012-0.026 mm, and when the fit clearance is too small, the shaft can be glued with the inner hole of the shell to be damaged; too large may result in too large a fit clearance between the shaft and the housing, causing internal leakage, and reducing the volumetric efficiency of the motor.

The working principle is as follows: twelve evenly distributed and staggered flow distribution grooves and two annular grooves are processed on the second shaft body of the output shaft, the flow distribution grooves are communicated with the two annular grooves in a staggered mode, the two annular grooves are respectively communicated with the liquid inlet and the liquid outlet, seven communicated radial grooves and flow distribution channels are processed on the inner hole of the body shell, the flow distribution grooves are in flow distribution with the radial grooves on the inner hole of the body shell, and the output shaft and the body shell jointly form a flow distribution system to realize the flow distribution function of keeping the hydraulic motor continuously running. When the motor works, the liquid inlet of the motor is communicated with the liquid inlet cavity of the stator-rotor pair by the flow distribution mechanism, and the liquid return cavity of the stator-rotor pair is communicated with the liquid return port of the motor. When pressure liquid enters the liquid inlet cavity of the stator-rotor pair from the liquid inlet of the motor, the volume of the pressure liquid is continuously enlarged, and simultaneously, the liquid in the liquid return cavity of the stator-rotor pair flows back from the liquid return port of the motor. In the process, the rotors in the stator-rotor pair are driven to rotate by the pressure difference of the liquid inlet cavity and the liquid return cavity. And the rotation is transmitted to an output shaft through a transmission shaft for output, thereby realizing the conversion from hydraulic energy to mechanical energy. Meanwhile, the distribution groove on the output shaft is driven by the transmission shaft to synchronously rotate, and the motor continuously outputs torque and rotating speed along with continuous distribution of the distribution groove.

Has the advantages that: compared with the prior art, the utility model, have following characteristics: when no radial bearing supports, the bearing can bear certain radial load and radial impact, the whole structure is compact, the machining precision of motor parts can be effectively reduced, a lubricating system of the motor parts is simplified, the assembly precision of the motor parts is optimized, the manufacturing cost of the motor can be effectively reduced, the cost performance of the motor is improved, and the product competitiveness is improved.

Drawings

Fig. 1 is a cross-sectional view of the present invention;

fig. 2 is a schematic structural diagram of the housing 1 of the present invention;

fig. 3 is a schematic structural diagram of the output shaft 2 of the present invention.

Detailed Description

The directions shown in the drawings of the specification are up, down, left and right.

Referring to fig. 1-2, the axial flow distribution cycloid hydraulic motor comprises an output shaft 2, a front cover 8, a shell 1, a partition plate 9, a stator-rotor pair 7, a rear cover 10 and the like. The stator and rotor pair 7 is composed of a stator, a rotor and pin teeth, the front cover 8 is fixed on the shell 1 through a screw 11, the transmission shaft 12 is connected with an internal spline of the output shaft 2 and an internal spline of the rotor, and the stator, the partition plate 9 and the rear cover 10 are fixed on the shell 1 through bolts 13. The positioning spigot is arranged on the front cover 8, the excircle of the output shaft 2 is matched with the inner hole 3 of the shell 1, the matching clearance is controlled to be between 0.012mm and 0.026mm, and the matching clearance is the clearance between the highest point of the arc shape of the shaft and the inner hole of the shell. One end of the output shaft 2 extends out of the shell 1, the shell 1 is provided with an inner hole 3 and seven radial grooves 4, the output shaft 2 penetrates through the inner hole 3, the seven radial grooves 4 are communicated with seven flow distribution channels 5, flow pulsation is not too large, 12 flow distribution grooves 6 are arranged on the surface of the output shaft 2 and are divided into two groups, one group of 6 corresponding liquid inlets and the other group of 6 corresponding liquid outlets.

As shown in fig. 3, the output shaft 2 includes a shaft head 201, a first shaft 202 and a second shaft 203, which are fixedly connected at a time, and the second shaft 203 is provided with a first shaft block 204, a second shaft block 205 and a third shaft block 206 at intervals. An annular groove is formed between the first shaft block 204 and the second shaft block 205, an annular groove is formed between the second shaft block 205 and the third shaft block 206, and the annular groove is in smooth transition with the first shaft block 204, the second shaft block 205 and the third shaft block 206. The second shaft block 205 is provided with a crescent-shaped distribution groove 6 which sequentially faces to the left side and the right side of the second shaft body 203. The outer circle of the flow distribution groove 6 of the second shaft block 205 has a certain radian along the axial direction of the output shaft 2. The first shaft block 204 and the third shaft block 206 can also be arc-shaped outer surfaces, and the difference between the highest point and the lowest point of the arc shape is less than or equal to 0.015mm, namely, the drum-shaped shaft can reduce various requirements, such as the requirement of providing a lubricating system for a radial bearing, the installation space, high machining precision of the matching part of the output shaft and the inner hole of the body shell and the bearing, complicated and careful installation of the motor and the like.

Claims

1. The utility model provides an axle distribution cycloid hydraulic motor which characterized in that: including casing (1) and output shaft (2), the one end of output shaft (2) extends outside casing (1), set up hole (3) and radial groove (4) in casing (1), hole (3) are passed in output shaft (2), radial groove (4) link to each other with flow distribution pore (5), flow distribution groove (6) are set up on the surface of output shaft (2).

2. The axial flow gerotor hydraulic motor of claim 1, further comprising: the output shaft (2) comprises a shaft head (201), a first shaft body (202) and a second shaft body (203), the first shaft body (202) is respectively connected with the shaft head (201) and the second shaft body (203), a first shaft block (204), a second shaft block (205) and a third shaft block (206) are arranged on the second shaft body (203) at intervals, and a flow distribution groove (6) is formed in the second shaft block (205) from the outermost side surface to the second shaft body (203).

3. The axial flow gerotor hydraulic motor of claim 2, further comprising: the distribution groove (6) is crescent.

4. The axial flow gerotor hydraulic motor of claim 2, further comprising: the distribution groove (6) sequentially extends to the first shaft block (204) and the third shaft block (206) along the axial direction of the second shaft body (203).

5. The axial flow gerotor hydraulic motor of claim 2, further comprising: the outer surface of the first shaft block (204) along the axial direction is arc-shaped.

6. The axial flow gerotor hydraulic motor of claim 2, further comprising: the outer surface of the second shaft block (205) along the axial direction is arc-shaped.

7. The axial flow gerotor hydraulic motor of claim 2, further comprising: the outer surface of the third shaft block (206) along the axial direction is arc-shaped.

8. The axial flow cycloid hydraulic motor of any one of claims 5 to 7, wherein: the difference between the highest point and the lowest point of the arc is less than or equal to 0.015 mm.

9. The axial flow gerotor hydraulic motor of claim 1, further comprising: the output shaft (2) is connected with the stator-rotor pair (7).

10. The axial flow gerotor hydraulic motor of claim 1, further comprising: the fit clearance between the highest point of the excircle of the output shaft (2) and the inner hole (3) is 0.012-0.026 mm.