Small-displacement axial flow distribution cycloid hydraulic motor

Abstract

The utility model relates to a small-displacement axial flow distribution cycloid hydraulic motor, and belongs to the technical field of hydraulic transmission. Comprising a motor positioning installation driving part and a motor body meshing pair part, a rotor-stator pair is a small-displacement rotor-stator pair, a concave table is arranged on the face, close to a rotor-stator pinwheel pair, of a rear cover of the motor body meshing pair part, and the spline tooth width of the end, matched with an inner spline of an output shaft, of a linkage shaft is large. And the spline tooth width at the end matched with the internal spline of the rotor is relatively thin. According to the universal driving shaft, the tooth width structure of the meshing spline is thickened, the quenching reliability of the spline teeth of the universal driving shaft is improved, the manufacturing manufacturability is good, and the assembling and maintaining manufacturability is good.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of hydraulic motor, especially a small displacement shaft matching flow cycloidal hydraulic motor, belong to hydraulic transmission technical field. BACKGROUND

[0002] Cycloidal hydraulic motor is a kind of commonly used hydraulic drive device, is a kind of low-speed large torque motor, with small volume, unit power density, high efficiency, wide speed range and other advantages, has been widely applied, and with the further improvement of China's industrial and agricultural development level will be more widely applied.

[0003] The basic structure of such device is that body shell or rear cover is provided with inlet and backflow port, one end is equipped with cycloidal pinwheel meshing pair and matching flow mechanism, matching flow mechanism can be set before or after cycloidal pinwheel meshing pair, generally in front (body shell side) for shaft valve matching flow, matching flow system circular face is axially arranged, in back (rear cover side) for plane matching flow, matching flow system plane is radially arranged, the other end is equipped with output shaft. The rotor of cycloidal pinwheel meshing pair is engaged with the outer gear of one end of linkage shaft through inner spline, the other end of linkage shaft is transmission connected with output shaft. When working, matching flow mechanism makes inlet and expansion meshing cavity of cycloidal pinwheel pair communicate, and makes contraction meshing cavity of cycloidal pinwheel pair and backflow port communicate. As a result, pressure liquid enters body shell or rear cover from inlet, enters expansion meshing cavity formed by cycloidal pinwheel meshing pair, so that its volume expands continuously, while the liquid in contraction meshing cavity formed by cycloidal pinwheel meshing pair flows back from backflow port; in this process, the rotor of cycloidal pinwheel meshing pair is driven to rotate by the pressure difference between expansion meshing cavity and contraction meshing cavity, and the rotation is transmitted to output shaft through linkage shaft to output, so as to realize the conversion of hydraulic energy to mechanical energy. At the same time, matching flow mechanism is also driven to rotate synchronously by linkage shaft, and the communication state of matching flow mechanism is switched continuously, so that the conversion process can continue. In this way, the motor can continuously output torque, and it can be said that cycloidal pinwheel meshing pair and matching flow mechanism are the core of cycloidal hydraulic motor.

[0004] According to the applicant's understanding, the meshing teeth length of the rotor and linkage shaft of the existing shaft matching flow cycloidal hydraulic motor is relatively long, that is, the thickness of the inner spline of the rotor is relatively thick, which is beneficial to design the structure of linkage shaft with sufficient tooth width (such as the patent document CN 204283724 U shows a kind of shaft matching flow cycloidal hydraulic motor). But for the inner spline with thickness not more than 6mm, the structure is easy to cause the tooth width of linkage shaft spline to be small, and the strength and heat treatment of spline tooth bring disadvantage, thereby increasing the reliability risk of product. SUMMARY

[0005] The utility model discloses a new structure is provided to make up for the defects of the existing structure, and the structure is especially suitable for 6 / 7 tooth integral type cycloid rotating sub, such as the cycloid motor with a displacement of 50ml / r or below.

[0006] In order to achieve the above object, the applicant analyzes the overall structure of the small displacement shaft matching flow cycloid hydraulic motor, especially the relationship and characteristics of the spline tooth engagement mechanism and its related parts, ensures the bearing capacity of the spline tooth of the linkage shaft and its strength,

[0007] Meanwhile, the reliability of the structure is ensured, and the technical scheme of the utility model is provided as follows: a motor positioning and installation driving part

[0008] is mainly composed of a body shell, an output shaft and a linkage shaft, and a motor main body engagement subpart mainly comprises a rotating sub, a spacer disc and a rear cover.

[0009] The improvement lies in that the rotating sub is a small displacement rotating sub, and the rear cover of the motor main body engagement subpart is provided with a concave platform on the side close to the rotating sub pinwheel sub.

[0010] The size of the concave platform can effectively sink in the axial direction during the movement of the linkage shaft, and the concave platform is concentric with the outer circle of the rear cover.

[0011] The sealing groove of the combination surface of the rear cover and the stator is arranged on the outer edge of the bolt hole of the combination surface of the rear cover.

[0012] The size of the concave platform is a circular surface with a diameter of Φ30.15±0.2mm, and the depth of the concave platform is 1.75±0.3mm.

[0013] The small displacement rotating sub is an integral rotating sub composed of a stator and a rotor, and the theoretical parameters of the cycloid sub of the small displacement rotating sub are as follows: 6 / 7 tooth structure, pinwheel diameter Φ22.25±0.1mm, pinwheel distribution circle diameter Φ68±0.1mm, and rotor eccentricity 3.15±0.1mm.

[0014] Further, the theoretical parameters of the cycloid sub of the small displacement rotating sub are as follows: 6 / 7 tooth structure, pinwheel diameter Φ22.225mm,

[0015] pinwheel distribution circle diameter Φ67.955mm, and rotor eccentricity 3.14mm.

[0016]

[0017] ​Further, the rotor-stator pair has a displacement of 25ml / r and a theoretical thickness of 4.1mm, the spline teeth at the two ends of the linkage shaft are different in length, the spline teeth at the end matched with the inner spline of the output shaft are thicker, and the spline teeth at the end matched with the inner spline of the rotor are thinner.

[0018] The spline teeth of the linkage shaft matched with the inner spline of the rotor-stator pair have a width greater than 3.3mm.

[0019] Compared with the prior art shaft matching flow trochoidal motor, the above scheme of the utility model is good in combination of the small displacement rotor-stator pair with small thickness, ingenious in the recessed table innovation design of the rear cover, thickened in the meshing spline tooth width structure, improved in the quenching reliability of the spline teeth of the linkage shaft, avoided in the design of using smaller eccentricity to increase the thickness of the rotor-stator pair, and favorable for reducing the material and processing cost and improving the performance of the product. BRIEF DESCRIPTION OF DRAWINGS

[0020] The utility model will be further described in detail below in combination with the drawings.

[0021] Fig. 1 is a structural schematic diagram of one embodiment of the utility model.

[0022] In the drawing, the output shaft 1, the key 2, the dustproof ring 3, the shaft seal 4, the plug 5, the valve body 6, the valve ball 7, the body shell 8, the oil port cover 9, the O-ring 10, the partition disc 11, the stator 12, the rear cover 13, the screw plug 14, the gasket 15, the steel gasket 16, the bolt 17, the rotor 18, the linkage shaft 19, the bearing 20 and the bearing retainer 21.

[0023] The channel 1-1, the channel 1-2 and the channel 1-3.

[0024] Fig. 2 is a structural schematic diagram of the rotor-stator pair in the embodiment of Fig. 1.

[0025] In the drawing, the stator 12 and the rotor 18.

[0026] Fig. 3 is a schematic diagram of the linkage shaft 19 in the embodiment of Fig. 1.

[0027] Fig. 4 is a schematic diagram of the rear cover 13 in the embodiment of Fig. 1. DETAILED DESCRIPTION

[0028] EMBODIMENT

[0029] The basic structure of a small displacement shaft flow distribution cycloid hydraulic motor of the embodiment is shown in Figure 1. The motor includes a motor positioning installation driving part and a motor main body meshing pair part. The motor positioning installation driving part mainly includes a body shell 8, an output shaft 1, a linkage shaft 19, etc. The motor main body meshing pair part mainly includes a rotating stator pair, a partition disc 11, and a rear cover 13. The small displacement rotating stator pair is shown in Figure 2 and is composed of a stator 12 and a rotor 18. The motor main body meshing pair part is fixed on the body shell 8 by bolts 17, thereby forming a cavity that is in communication with seven flow distribution channels in the body shell 8 and high and low pressure oil holes of the partition disc 11, and realizing the movement function of the cycloid hydraulic motor. The rotating stator pair is a small displacement rotating stator pair. The rear cover 13 of the motor main body meshing pair part is provided with a concave platform on the side close to the rotating stator pin wheel pair. The concave platform is shown in the rear cover 13 schematic diagram of Figure 4.

[0030] The size of the concave platform can effectively sink in the axial direction during the movement of the linkage shaft 19 and ensure that the linkage shaft 19 retains a proper gap during the movement in the axial direction. The circular surface of the concave platform is concentrically arranged with the outer circle of the rear cover 13.

[0031] The sealing groove of the joint surface of the rear cover 13 and the stator 12 is arranged on the outer edge of the bolt hole of the joint surface. The sealing groove is provided with an O-ring 10 for joint surface sealing. Since the thickness of the small displacement stator 12 is small, the arrangement of the sealing groove on both end surfaces of the stator 12 is not conducive to the heat treatment of the stator 12 and may affect the strength of the stator 12.

[0032] The size of the concave platform of the rear cover 13 is a circular surface Φ30.15±0.2mm, and the depth of the concave platform is 1.75±0.3mm. The arrangement of the structure ensures that there is enough gap during the movement of the linkage shaft 19 and cleverly ensures that the tooth width of the small displacement linkage shaft 19 is sufficient.

[0033] The small displacement rotating stator pair is an integral rotating stator pair composed of the stator 12 and the rotor 18. The theoretical parameters of the small displacement rotating stator pair cycloid pair are as follows: 6 / 7 tooth structure, pin wheel diameter Φ22.25±0.1mm, pin wheel distribution circle diameter Φ68±0.1mm, and rotor eccentricity 3.15±0.1mm.

[0034] The theoretical parameters of the small displacement rotating stator pair cycloid pair are as follows: 6 / 7 tooth structure, pin wheel diameter Φ22.225mm, pin wheel distribution circle diameter Φ67.955mm, and rotor eccentricity 3.14mm.

[0035] The theoretical thickness of the rotor of the small displacement rotor-stator pair with a displacement of 25ml / r is 4.1mm. The spline teeth at both ends of the linkage shaft 19 that matches the small displacement rotor-stator pair with a displacement of 25ml / r are different, as shown in Figure 3. The spline teeth of the linkage shaft 19 that match the spline inside the output shaft 1 are thicker, while the spline teeth that match the spline inside the rotor 18 are thinner.

[0036] The spline tooth width a of the rotor-stator pair with a displacement of 25ml / r, which is matched with the internal spline of the rotor 18, is greater than 3.3mm.

[0037] As shown in Figure 1, the housing of item 8 is an integral structure, which differs from the typical structure and processing requirements where the positioning stop of a shaft-distributed cycloidal motor is located on the front cover connected to the housing by screws. Item 8 housing has casting channels 1-1 and 1-2 inside.

[0038] 1-3, the aforementioned channel is connected to the one-way valve structure. The one-way valve is mounted on the housing 8 and consists of a plug 5, a valve body 6, and a valve ball 7. The valve ball 7 is located in the inner cavity of the valve body 6. One end of the inner cavity is connected to one end of the plug 5 through a small hole, and the other end is limited by the thin wall of the inner cavity of the valve body 6 through three-point compression deformation, so that the valve ball 7 forms a one-way oil passage function under high and low pressure hydraulic oil. The one-way valve structure does not have a rubber sealing ring.

[0039] The plug 5 is a ball-expansion type high-pressure plug that seals the oil in the motor cavity.

[0040] The casting channel 1-1 at the front end of the housing 8 is a unidirectional offset local channel facing the oil port. After the housing 8 is machined, the casting channel 1-1 connects the one-way valve and the motor leakage oil cavity. The casting channels 1-2 and 1-3 at the rear end of the housing are internal oil flow channels designed to connect the rear oil port B and the rear annular groove oil passage of the output shaft 1. Due to the casting characteristics of the casting channels 1-2 and 1-3, both ends communicate with the circular inner cavity of the housing 8, forming an open ring, which is beneficial for casting. This structural design helps reduce the machining difficulty. If the one-way valve hole is not provided to communicate with the oil port B, a deep and long hole needs to be machined, which has a certain degree of machining difficulty.

[0041] In addition to the embodiments described above, this utility model may have other implementations. For example, the housing 8 may employ a high-pressure shaft seal instead of a one-way valve, or it may employ a housing structure with a front cover, with the mounting stop located on the front cover. All technical solutions formed by equivalent substitution or equivalent transformation fall within the protection scope claimed by this utility model.

Claims

1. A small-displacement shaft-distribution cycloidal hydraulic motor, comprising two main parts: a motor positioning and mounting drive part and a motor body meshing pair part. The motor positioning and mounting drive part mainly includes a housing, an output shaft, and a linkage shaft. The motor body meshing pair part mainly consists of a rotor-stator pair, a partition plate, and a rear cover. Its characteristics are: The rotor-stator pair is a small-displacement rotor-stator pair, and a recess is provided on the rear cover of the meshing part of the motor body near the rotor-stator pinwheel pair.

2. The small-displacement axial-distribution cycloidal hydraulic motor according to claim 1, characterized in that: The recessed platform is sized to effectively sink into the axial direction during the movement of the linkage shaft, and the circular surface of the recessed platform is concentric with the outer circle of the rear cover.

3. The small-displacement axial-distribution cycloidal hydraulic motor according to claim 1, characterized in that: The sealing groove of the mating surface between the rear cover and the stator is located on the outer edge of the bolt hole on the mating surface of the rear cover.

4. A small-displacement axial-distribution cycloidal hydraulic motor according to claim 1 or 2, characterized in that: The recessed platform has a circular surface size of Φ30.15±0.2mm and a depth of 1.75±0.3mm.

5. A small-displacement axial-distribution cycloidal hydraulic motor according to claim 1, characterized in that: The small displacement rotor-stator pair is an integral rotor-stator pair, consisting of a stator and a rotor. The theoretical parameters of the small displacement rotor-stator pair cycloidal pair are: 6 / 7 tooth structure, pin wheel diameter Φ22.25±0.1mm, pin wheel distribution circle diameter Φ68±0.1mm, and rotor eccentricity 3.15±0.1mm.

6. A small-displacement axial-distribution cycloidal hydraulic motor according to claim 5, characterized in that: The theoretical parameters of the small displacement rotor-stator pair cycloidal pair are: 6 / 7 tooth structure, pin wheel diameter Φ22.225mm, pin wheel distribution circle diameter Φ67.955mm, and rotor eccentricity 3.14mm.

7. A small-displacement axial-distribution cycloidal hydraulic motor according to claim 1 or 5, characterized in that: The rotor-stator pair has a displacement of 25ml / r and a theoretical rotor thickness of 4.1mm. The spline tooth width and length at both ends of the matching linkage shaft are different. The spline tooth width at the end of the linkage shaft that mates with the spline inside the output shaft is thicker, while the spline tooth width at the end that mates with the spline inside the rotor is thinner.

8. A small-displacement axial-distribution cycloidal hydraulic motor according to claim 7, characterized in that: The rotor-stator pair has a displacement of 25 ml / r, and the spline tooth width that matches the internal spline of the rotor is greater than 3.3 mm.

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