CN113700595A - Axial flow distribution cycloid hydraulic motor - Google Patents

Abstract

The invention relates to an axial flow distribution cycloid hydraulic motor, and belongs to the technical field of hydraulic transmission. The motor comprises a front cover, a body shell and a rotor-stator meshing pair, wherein the front cover and the body shell are fixedly connected with each other, one end of the rotor-stator meshing pair is fixedly connected with the body shell through a partition plate, and the other end of the rotor-stator meshing pair is fixedly connected with a rear cover; an output shaft extending from the outer end is arranged in the body shell, the output shaft is in transmission connection with a rotor-stator meshing pair through a linkage shaft, the outer diameter of the stator is smaller than phi 90mm, a stator bolt connecting hole is communicated with a rotor-stator meshing pair meshing cavity, a connecting bolt mounting hole of a partition plate between the rotor-stator meshing pair and the body shell is communicated with an oil through hole, and the centers of the two connected holes respectively form an included angle with a connecting line of the centers of the partition plates. The motor has compact structure and stable and reliable motion, improves the efficiency of the motor, and enhances the reliability and maintainability, thereby meeting the use requirement.

Description

Axial flow distribution cycloid hydraulic motor

Technical Field

The invention relates to a cycloid hydraulic motor, in particular to an axial flow distribution cycloid hydraulic motor, and belongs to the technical field of hydraulic transmission.

Background

The cycloid hydraulic motor is a common hydraulic driving device, is a low-speed large-torque motor, has the advantages of small volume, high unit power density, high efficiency, wide rotating speed range and the like, is widely applied, and is more widely applied along with further improvement of the industrial and agricultural development level in China.

The basic structure of the device is that a liquid inlet and a backflow port are arranged on a body shell or a rear cover, one end of the device is provided with a cycloid pinwheel meshing pair and a flow distribution mechanism, the flow distribution mechanism can be placed in front of or behind the cycloid pinwheel meshing pair and generally distributes flow for a shaft valve in front (on one side of the body shell), a circular surface of a flow distribution system is axially arranged, plane flow distribution is arranged on the rear (on one side of the rear cover), a plane of the flow distribution system is radially arranged, and the other end of the flow distribution system is provided with an output shaft. And a rotor of the cycloidal pin gear meshing pair is meshed with an external tooth at one end of the universal driving shaft through an internal spline, and the other end of the universal driving shaft is in transmission connection with the output shaft. When the cycloidal pin gear pair works, the flow distribution mechanism enables the liquid inlet to be communicated with the expansion meshing cavity of the cycloidal pin gear pair and enables the contraction cavity of the cycloidal pin gear pair to be communicated with the reflux port. As a result, pressure liquid enters the body shell or the rear cover from the liquid inlet and then enters the expansion meshing cavity formed by the cycloid pin gear meshing pair, so that the volume of the expansion meshing cavity is continuously enlarged, and meanwhile, liquid in the contraction meshing cavity formed by the cycloid pin gear meshing pair flows back from the return port; in the process, the rotor of the cycloidal pin gear meshing pair is driven to rotate by the pressure difference between the expansion meshing cavity and the contraction meshing cavity, and the rotation is transmitted to the output shaft through the linkage shaft to be output, so that the conversion from hydraulic energy to mechanical energy is realized. Meanwhile, the flow distribution mechanism is also driven by the linkage shaft to rotate, and the communication state is repeatedly and continuously switched, so that the conversion process is continued. Thus, the motor can continuously output torque, and the cycloid pin gear meshing pair and the flow distribution mechanism are the core of the hydraulic motor.

According to the knowledge of the applicant, the application of the existing shaft valve flow distribution cycloid hydraulic motor with a small structure is developed rapidly, and mainly comprises an OMP series of Danish DANFOSS, an MP series of Bulgaria M + S, a BMP series of the applicant company and the like, because the shaft valve flow distribution cycloid hydraulic motor with the small structure is provided with an integral rotating stator meshing pair with the outer diameter smaller than phi 90, the integral rotating stator meshing pair has the characteristics of large eccentricity, sliding friction of the meshing pair and great influence on efficiency and low rotating speed, but has compact appearance smaller than the phi 90 outer diameter and the like of a phi 82.55 spigot or a similar phi 80 spigot of SAE A type standard.

Disclosure of Invention

The invention aims to: aiming at the problems in the prior art, the motor has compact structure and small overall dimension, particularly changes the compact appearance that the integral rotor-stator meshing pair is adopted and the outer diameter is smaller than phi 90, and has simple and reliable structure, good manufacturing manufacturability and good assembly manufacturability.

In order to achieve the purpose, the applicant provides a cycloid hydraulic motor structure with compact structure and low cost through structural analysis of the existing motor, and the technical scheme of the invention is as follows: a kind of axial flow distribution cycloid hydraulic motor, including front cover and body shell that link firmly each other, and one end links firmly with body shell through the spacer disc, another end and the back cover links firmly the rotating stator engagement pair; an output shaft with an outer end extending out is arranged in the body shell, and the output shaft is in transmission connection with a rotor-stator meshing pair through a linkage shaft; the improvement is that: the rotor-stator meshing pair is composed of a stator, a rotor and needle teeth, the outer diameter of the stator is smaller than phi 90mm, a stator bolt connecting hole is communicated with a rotor-stator meshing pair meshing cavity, a connecting bolt mounting hole of a partition plate between the rotor-stator meshing pair and a body shell is communicated with an oil through hole, the centers of two holes connected with the partition plate respectively form an included angle with a connecting line of the centers of the partition plate, the included angle is 8-12 degrees, and the two holes connected with the partition plate are communicated in a mode of two tangent lines of local circles.

The hydraulic fluid port face oil mouth line of body shell is the slash setting with the motor axis, the body shell has mounting flange, sets up the protecgulum that has the location tang in the mounting flange, sets up the check valve in the body shell of protecgulum installation face one side.

The outer diameter of the stator is between phi 84.5mm and phi 87 mm.

Further preferably, the distance between the two connected holes of the partition plate and the center is larger than the distance between the two connected holes and the center, and an included angle formed between the centers of the two connected holes and a connecting line of the centers of the partition plates is 11.5 degrees.

Still further preferably, the stator has an outer diameter of 86.5 mm.

After the technical scheme is adopted, the invention has the beneficial effects that:

according to the axial flow distribution cycloid hydraulic motor, through the study on the overall layout structure of the cycloid hydraulic motor, the motor rotor and stator meshing pair has a pure rolling pin tooth embedded column type structure, has the installation and connection mode of the traditional small-sized structure series motor, has an external shape with the outer diameter smaller than phi 90mm, and has a structure with communicated pore channels through the partition plate, so that the cycloid hydraulic motor has the advantages of compact overall structure, stable and reliable movement, high strength, simple overall structure, good manufacturing manufacturability and good assembly and maintenance manufacturability, and further meets the use requirements.

Drawings

In order that the present disclosure may be more readily and clearly understood, reference will now be made in detail to the present disclosure, examples of which are illustrated in the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Fig. 1 is a schematic structural diagram of a first embodiment of the present invention.

In the figure: the device comprises an output shaft 1, a key 2, a dust ring 3, a shaft seal 4, a front cover 5, a one-way valve body 6, a sealing ring 7, a valve ball 8, a body shell 9, an oil port cover 10, an O-shaped ring 11, a partition disc 12, a rotor-stator meshing pair 13, a rear cover 14, a plug screw 15, a gasket 16, a steel gasket 17, a connecting bolt 18, a rear needle bearing 19, a linkage shaft 20, a front needle bearing 21, a rear retainer ring 22, an O-shaped ring 23, a plane thrust bearing 24, a front retainer ring 25 and a screw 26.

FIG. 2 is a schematic view of the embodiment of FIG. 1.

FIG. 3 is a schematic view of the oil port surface in the embodiment of FIG. 1.

Fig. 4 is a schematic view of a rotor-stator meshing pair in the embodiment of fig. 1.

Detailed Description

The following examples are given for the detailed implementation and specific operation of the present invention, but the scope of the present invention is not limited to the following examples.

The above object is achieved by the following embodiments:

example one

Referring to fig. 1, the basic structure of the axial flow distribution cycloid hydraulic motor of the invention comprises a front cover 5 and a body shell 9 which are fixedly connected with each other, and a rotating stator meshing pair 13, one end of which is fixedly connected with the body shell 9 through a partition disc 12, and the other end of which is fixedly connected with a rear cover 14, wherein the body shell 9, the partition disc 12, the rotating stator meshing pair 13 and the rear cover 14 are fixed into a whole by a connecting bolt 18; body shell 9 has mounting flange, set up protecgulum 5 in the mounting flange, optional protecgulum 5 has motor installation location tang, link firmly as an organic whole with body shell 9 through screw 26, set up bearing seal 4 in the protecgulum 5, carry out fluid rotary seal to output shaft 1 rotary motion, make the motor inner chamber form closed inner chamber, set up the check valve who links up respectively with inlet and backward flow mouth in the body shell 9, the check valve is by check valve body 6, sealing washer 7 and valve ball 8 are constituteed, output shaft 1 that the outer end extends is equipped with in the body shell 9, preferably both ends have respectively set up radial needle bearing around output shaft 1, make the output shaft of output shaft 1 stretch and can bear bigger radial force.

The output shaft 1 is in transmission connection with a rotor-stator meshing pair 13 through a linkage shaft 20, referring to fig. 4, the rotor-stator meshing pair 13 is composed of a stator 13-1, a rotor 13-2 and a pin gear 13-3, the outer diameter of the stator is smaller than phi 90mm, and the stator bolt connecting hole is communicated with a rotor-stator meshing pair 13 meshing cavity; referring to fig. 3, a central connecting line of the liquid inlet of the oil port surface of the body shell 9 and the two oil ports of the return port is inclined to the axis of the motor.

The outer diameter of the stator is between phi 84.5mm and phi 87mm, and preferably the outer diameter of the stator is phi 86.5 mm.

Referring to fig. 2, mounting holes of connecting bolts 18 of a partition plate 12 between a rotor-stator meshing pair 13 and a body shell 9 are communicated with oil through holes, centers of two connected holes respectively form an included angle alpha with a connecting line of centers of the partition plate 12, the included angle alpha is between 8 degrees and 12 degrees, the communication mode is a tangent line of two local circles, the distance between the two connected holes of the partition plate and the center is larger than the distance between the two connected holes of the partition plate and the center, the included angle alpha is 11.5 degrees, the two connected holes of the partition plate are uniformly distributed in the form of needle tooth number.

Referring to fig. 4, an included angle α is formed by two holes of the partition plate 12, and a stator connecting bolt mounting hole of the rotor-stator meshing pair 13 is communicated with an inner cavity formed by the rotor-stator meshing pair 13 to form a motor oil passage.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express one embodiment of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (7)

1. A kind of axial flow distribution cycloid hydraulic motor, including front cover and body shell that link firmly each other, and one end links firmly with body shell through the spacer disc, another end and the back cover links firmly the rotating stator engagement pair; an output shaft with an outer end extending out is arranged in the body shell, and the output shaft is in transmission connection with a rotor-stator meshing pair through a linkage shaft; the method is characterized in that: the rotor-stator meshing pair is composed of a stator, a rotor and needle teeth, the outer diameter of the stator is smaller than phi 90mm, a stator bolt connecting hole is communicated with a rotor-stator meshing pair meshing cavity, a connecting bolt mounting hole of a partition plate between the rotor-stator meshing pair and a body shell is communicated with an oil through hole, the centers of two holes connected with the partition plate respectively form an included angle with a connecting line of the centers of the partition plate, and the included angle is 8-12 degrees.

2. The axial flow gerotor hydraulic motor of claim 1, further comprising: the two holes connected with the partition plate are communicated in a mode of two tangent lines of local circles.

3. The axial flow gerotor hydraulic motor of claim 1, further comprising: the oil port surface and oil port connecting line of the body shell and the axis of the motor are arranged in an oblique line.

4. The axial flow gerotor hydraulic motor of claim 3, further comprising: the body shell is provided with a mounting flange, a front cover with a positioning spigot is arranged in the mounting flange, and a one-way valve is arranged in the body shell on one side of the mounting surface of the front cover.

5. The axial flow gerotor hydraulic motor of claim 1, further comprising: the outer diameter of the stator is between phi 84.5mm and phi 87 mm.

6. The axial flow cycloid hydraulic motor of claim 1 or 2, wherein: the distance between the two connected holes of the partition plate and the center is larger than that between the two connected holes and the center, and an included angle formed by the centers of the two connected holes and a connecting line of the centers of the partition plate is 11.5 degrees.

7. The axial flow gerotor hydraulic motor of claim 5, further comprising: the outer diameter of the stator is 86.5 mm.

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