Cycloid motor with large torque output

Abstract

The invention relates to the technical field of power transmission, in particular to a large-torque output cycloid motor which comprises a rear shell, an oil distribution disc is arranged on the rear shell, a stator body is arranged on the oil distribution disc, a needle column and a cycloid gear are arranged in the stator body, a transmission shaft is arranged in the cycloid gear in a meshed mode, and a planetary transmission mounting plate is fixedly arranged on the stator body. The transmission shaft is fixedly inserted on the planetary transmission mounting plate, three groups of planetary gears are uniformly distributed on the planetary transmission mounting plate along the central axis, the three groups of planetary gears are meshed with the transmission shaft, the planetary gears are meshed with an output shaft, a front shell is fixedly arranged on the planetary transmission mounting plate, and the output shaft is inserted on the front shell; the output shaft end extends out of the end of the front shell, and the extending end is used for being connected with external transmission equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of power transmission, and in particular to a cycloid motor with large torque output. Background Art

[0002] Cycloidal motors are medium-speed, high-torque motors. Driven by hydraulic pressure, the cycloidal wheel rotates about its central axis and revolves around the center of the stator. Traditionally, the drive shaft used is a drum-shaped splined shaft with two ends. One end of the drive shaft meshes with the splines within the cycloidal wheel, and the other end meshes with the output shaft, which is connected to an external transmission device. During operation, hydraulic pressure drives the cycloidal wheel, which in turn drives the drive shaft, which in turn drives the output shaft, generating both rotation and torque. This traditional structure generates significant vibration and noise between the cycloidal wheel and the drive shaft, as well as wear between the meshing parts, which impacts the product's service life. Summary of the Invention

[0003] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the present invention is to provide a cycloidal motor with high torque output, optimize the transmission shaft structure, add a two-stage reduction, reduce the vibration, noise, and wear generated by the swing of the rotating shaft, and increase the rotational torque.

[0004] The technical solution adopted by the present invention is: A cycloid motor with large torque output comprises a rear housing, an oil distribution plate is arranged on the rear housing, a stator body is arranged on the oil distribution plate, a needle column and a cycloid wheel are arranged in the inner cavity of the stator body, and the needle column is inserted into the inner cavity wall of the stator body; arc-shaped cycloid teeth are arranged on the outer edge of the cycloid wheel, a second inner gear ring is arranged in the inner cavity, and a transmission shaft is arranged in meshing with the second inner gear ring; the transmission shaft comprises a rotating shaft, a first transmission gear is arranged at one end of the rotating shaft, and a second transmission gear is arranged at the other end, and the first transmission gear is meshed with the second inner gear ring; a planetary transmission mounting plate is fixedly arranged on the stator body, the rotating shaft is inserted in the center of the planetary transmission mounting plate, the second transmission gear is located above the planetary transmission mounting plate, and three groups of planetary gears are evenly distributed and meshed around the second transmission gear; the output shaft is meshed with the planetary gears, and a front housing is fixedly arranged on the planetary transmission mounting plate, the output shaft is inserted in the front housing, and the output shaft end extends out of the end of the front housing.

[0005] The arc-shaped cycloid teeth are tangentially meshed with the outer edge of the needle column, and the cycloid wheel swings eccentrically in the inner cavity of the stator.

[0006] The inner diameter of the second inner gear ring is larger than the outer diameter of the first transmission gear, and the first transmission gear is eccentrically meshed with the second inner gear ring for transmission.

[0007] A T-shaped shaft hole is provided at the center of the planetary transmission mounting plate, a first sliding bearing is provided in the T-shaped shaft hole, the first sliding bearing is a split T-shaped sliding bearing, and a rotating shaft is provided in the shaft hole of the first sliding bearing.

[0008] A circular shaft hole is provided on the planetary transmission mounting plate. The position of the circular shaft hole matches the planetary gear. A third sliding bearing is inserted into the circular shaft hole. The planetary gear is provided in the third sliding bearing.

[0009] The output shaft includes a third cylindrical shaft, which is inserted into the front housing and extends out of the end of the front housing. A fourth cylindrical shaft is set at the end of the third cylindrical shaft. The diameter of the third cylindrical shaft is smaller than the diameter of the fourth cylindrical shaft. A first inner gear ring is set inside the fourth cylindrical shaft, and the first inner gear ring is meshed with the planetary gear.

[0010] The front housing is a stepped cylindrical structure, including a first cylindrical shaft, a second cylindrical shaft is arranged at one end of the first cylindrical shaft, the diameter of the first cylindrical shaft is smaller than that of the second cylindrical shaft, a first axial hole is set through the front housing along the central axis, a second annular groove is set at the bottom end of the second cylindrical shaft, a first annular groove is set below the second annular groove, the diameter of the first annular groove is smaller than that of the second annular groove, the third cylindrical shaft is passed through the first axial hole, the fourth cylindrical shaft is set in the first annular groove, and the planetary transmission mounting plate is set in the second annular groove.

[0011] An annular sealing groove is provided on the end surface of the stator body which is in contact with the planetary transmission mounting plate, and a sealing ring is provided in the annular sealing groove.

[0012] A second sliding bearing is arranged in the first annular groove, and a fourth cylindrical shaft is arranged in the shaft hole of the second sliding bearing.

[0013] Beneficial effects of the present invention: A cycloid motor with large torque output according to the present invention comprises a rear housing, an oil distribution plate is arranged on the rear housing, a stator body is arranged on the oil distribution plate, a needle column and a cycloid wheel matching the needle column are arranged in the inner cavity of the stator body, an inner gear ring is arranged on the cycloid wheel, and the inner gear ring is meshed with a transmission shaft to form a first-stage cycloid reduction drive component under hydraulic drive; three sets of planetary gears are meshed at the other end of the transmission shaft to form a second-stage planetary reduction drive component, one end of the output shaft is connected to external equipment, and an inner gear ring is arranged at the other end, and the inner gear ring is meshed with the three sets of planetary gears. In this embodiment, the transmission shaft is reduced by the planetary gears, and the planetary gears are then meshed with the output shaft for transmission, thereby weakening the vibration, noise and wear generated when the transmission shaft is directly connected to the output shaft, and the large torque required for output is output through the second-stage reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are specifically listed below and accompanied by accompanying drawings. However, the embodiments in the drawings do not constitute any limitation to the present invention. For ordinary technicians in this field, other drawings can be obtained based on the following drawings without making any creative efforts.

[0015] Figure 1Schematic diagram of the overall structure; Figure 2 Schematic diagram of the internal structure; Figure 3 Schematic diagram of the stator structure; Figure 4 Schematic diagram of the stator body, needle column and cycloid wheel structure; Figure 5 This is a schematic diagram of the structure of the planetary gear and planetary transmission mounting plate; Figure 6 Schematic diagram of the output shaft and transmission shaft structure.

[0016] In the figure: 1-rear housing, 2-oil distribution plate, 3-stator body, 301-cycloid wheel mounting hole, 302-needle column mounting hole groove, 303-cycloid wheel tooth avoidance groove, 304-annular sealing groove, 4-front housing, 401-first cylindrical shaft, 402-second cylindrical shaft, 403-first shaft hole, 404-first annular groove, 405-second annular groove, 5-output shaft, 501-third cylindrical shaft, 502-fourth cylindrical shaft , 503-first inner gear ring, 6-needle column, 7-cycloid wheel, 701-arc-shaped cycloid tooth, 702-second inner gear ring, 8-first sliding bearing, 9-transmission shaft, 901-rotating shaft, 902-first transmission gear, 903-second transmission gear, 10-planetary gear, 11-planetary transmission mounting plate, 1101-T-type shaft hole, 1102-circular shaft hole, 12-second sliding bearing, 13-third sliding bearing. DETAILED DESCRIPTION

[0017] To make the objectives, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0018] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them. They are not used to limit the conditions under which the present invention can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in the present invention without affecting the efficacy and purpose that can be achieved by the present invention.

[0019] like Figure 1 、 Figure 2As shown, a cycloidal motor with large torque output includes a rear housing 1, an oil distribution plate 2 is provided on the rear housing 1, a stator body 3 is provided on the oil distribution plate 2, a needle column 6 and a cycloidal wheel 7 are provided in the inner cavity of the stator body 3, the needle column 6 is inserted into the inner cavity wall of the stator body 3, a transmission shaft 9 is arranged in meshing with the cycloidal wheel 7, a planetary transmission mounting plate 11 is fixedly provided on the stator body 3, the transmission shaft 9 is fixedly inserted into the planetary transmission mounting plate 11, three groups of planetary gears 10 are evenly distributed along the central axis of the planetary transmission mounting plate 11, the three groups of planetary gears 10 are meshed with the transmission shaft 9, the planetary gears 10 are meshed with the output shaft 5, a front housing 4 is fixedly provided on the planetary transmission mounting plate 11, the output shaft 5 is inserted into the front housing 4, and the output shaft end extends out of the end of the front housing 4, and the extended end is used to connect external transmission equipment.

[0020] like Figure 3 、 Figure 4 As shown, the stator body 3's shape is designed to match that of the oil distribution plate 2, ensuring the motor's aesthetics. A cycloidal gear mounting hole 301 runs through the center of the stator body 3. Cycloidal gear 7 is mounted within this hole. Several pin mounting holes 302 are evenly distributed along the wall of the cycloidal gear mounting hole 301 for receiving the pin 6. Cycloidal gear tooth avoidance grooves 303 are also provided on the wall of the cycloidal gear mounting hole 301. These grooves are located between the pin mounting holes 302. An annular sealing groove 304 is provided on the end surface of the stator body 3 that contacts the planetary transmission mounting plate 11. A sealing ring is positioned within this annular sealing groove 304.

[0021] like Figure 4 As shown, the outer edge of the cycloid wheel 7 is provided with a cycloid arc, which is matched with the circular arc surface of the needle column 6. The cycloid arc on the outer edge of the cycloid wheel 7 forms an arc-shaped cycloid tooth 701. The inner ring of the cycloid wheel 7 is provided with a second inner gear ring 702, and the transmission shaft 9 is meshed with the second inner gear ring 702. The cycloid wheel 7 meshes with the needle column 6 in the cycloid wheel mounting hole 301 and oscillates eccentrically. The arc surface of the arc-shaped cycloid tooth 701 is tangentially abutted with the outer edge surface of the needle column 6, forming a sealed cavity. Hydraulic oil enters the cavity to form a high-pressure chamber. The hydraulic pressure in the high-pressure chamber drives the cycloid wheel 7 to rotate. The cycloid wheel 7 rotates, the second inner gear ring 702 of the cycloid wheel 7 rotates, and the transmission shaft 9 meshed with the second inner gear ring 702 rotates.

[0022] like Figure 4 、 Figure 6 As shown, the transmission shaft 9 includes a rotating shaft 901, a first transmission gear 902, and a second transmission gear 903. The first transmission gear 902 is set at one end of the rotating shaft 901, and the second transmission gear 903 is set at the other end. The first transmission gear 902 is set in the second inner ring gear 702. The inner diameter of the second inner ring gear 702 is larger than the outer diameter of the first transmission gear 902. The first transmission gear 902 is eccentrically meshed with the second inner ring gear 702 for transmission.

[0023] As described above, the needle column 6 inserted into the inner wall of the stator body 3, the cycloid wheel 7, and the first transmission gear 902 provided on the transmission shaft 9 form a cycloid reduction drive component driven by the hydraulic oil.

[0024] like Figure 2 、 Figure 5 As shown, a planetary transmission mounting plate 11 is fixedly provided on the stator body 3, a rotating shaft 901 is passed through the central axis hole of the planetary transmission mounting plate 11, a second transmission gear 903 is provided above the planetary transmission mounting plate 11, and a plurality of planetary gears 10 are evenly distributed around the second transmission gear 903 for meshing. In this embodiment, three sets of planetary gears 10 are provided.

[0025] Further, such as Figure 5 As shown, to ensure smooth rotation of the transmission shaft 9, a T-shaped shaft hole 1101 is provided at the center of the planetary transmission mounting plate 11. A first sliding bearing 8 is inserted into T-shaped shaft hole 1101. First sliding bearing 8 is a split T-shaped sliding bearing, snap-fitted onto the rotating shaft 901 and inserted into T-shaped shaft hole 1101. Circular shaft holes 1102 are evenly distributed around T-shaped shaft hole 1101, and the positions of circular shaft holes 1102 match those of planetary gears 10. Third sliding bearings 13 are inserted into circular shaft holes 1102, and planetary gears 10 are installed within third sliding bearings 13.

[0026] As described above, the second transmission gear 903 and the planetary gear 10 provided on the transmission shaft 9 form a planetary reduction drive component.

[0027] like Figure 6 As shown, the planetary gear 10 is meshed with the output shaft 5. The output shaft 5 includes a third cylindrical shaft 501. The third cylindrical shaft 501 is inserted into the front housing 4 and extends out of the end of the front housing 4. The extended end of the third cylindrical shaft 501 is used to connect to external transmission equipment. A fourth cylindrical shaft 502 is provided at the end of the third cylindrical shaft 501. The diameter of the third cylindrical shaft 501 is smaller than the diameter of the fourth cylindrical shaft 502. A first inner gear ring 503 is provided inside the fourth cylindrical shaft 502, and the first inner gear ring 503 is meshed with the planetary gear 10.

[0028] like Figure 2As shown, the front housing 4 is a stepped cylindrical structure, including a first cylindrical shaft 401, a second cylindrical shaft 402 is provided at one end of the first cylindrical shaft 401, the diameter of the first cylindrical shaft 401 is smaller than that of the second cylindrical shaft 402, and a first axial hole 403 is provided along the central axis of the front housing 4, a second annular groove 405 is provided on the bottom end face of the second cylindrical shaft 402, a first annular groove 404 is provided below the second annular groove 405, the diameter of the first annular groove 404 is smaller than that of the second annular groove 405, the third cylindrical shaft 501 of the output shaft 5 is passed through the first axial hole 403, the fourth cylindrical shaft 502 is provided in the first annular groove 404, and the planetary transmission mounting plate 11 is provided in the second annular groove 405.

[0029] Furthermore, in order to ensure smooth rotation of the output shaft 5 , a second sliding bearing 12 is disposed in the first annular groove 404 , and a fourth cylindrical shaft 502 is disposed in the shaft hole of the second sliding bearing 12 .

[0030] The rear housing 1 is provided with an oil passage and an interface, and the oil distribution plate 2 is provided with holes and grooves. The structure of the rear housing 1 and the oil distribution plate 2 is a mature technology of hydraulic technology, which is not the focus of this embodiment and will not be described here.

[0031] The external oil circuit is connected with the channel of the rear housing 1, and the hydraulic oil enters the oil cavity formed by the cycloid gear avoidance groove 303, the arc surface of the arc-shaped cycloid gear 701, and the outer edge surface of the needle column 6 through the oil distribution channel set in the oil distribution plate 2. The oil cavity formed by the cycloid gear avoidance groove 303, the arc surface of the arc-shaped cycloid gear 701, and the outer edge surface of the needle column 6 has a small volume to form a high-pressure cavity and a large volume to form a low-pressure cavity. The hydraulic pressure in the high-pressure cavity drives the cycloid wheel 7 to rotate. When the cycloid wheel 7 rotates, the second The rotation of the inner ring gear 702 causes the first transmission gear 902 meshing with the second inner ring gear 702 to rotate, which in turn causes the second transmission gear 903 coaxial with the first transmission gear 902 to rotate, which in turn causes the planetary gear 10 meshing with the second transmission gear 903 to rotate, which in turn causes the first inner ring gear 503 meshing with the planetary gear 10 to rotate, which in turn causes the third cylindrical shaft 501 coaxial with the first inner ring gear 503 to rotate, thereby driving the external drive device connected to the third cylindrical shaft 501, causing the external drive device to operate. This cycloidal motor in this embodiment performs a double reduction: the first reduction stage is achieved by the tooth difference between the first transmission gear 902 and the second inner ring gear 702, which is eccentrically meshed. The second reduction stage is achieved by the planetary gear train of the second transmission gear 903, the planetary gear 10, and the first inner ring gear 503. Finally, the output shaft 5 rotates to output the rotational speed, achieving stable transmission and high torque output.

Claims

1. A cycloidal motor with high torque output, comprising a rear housing (1), an oil distribution plate (2) disposed on the rear housing (1), and a stator body (3) disposed on the oil distribution plate (2), characterized in that: The inner cavity of the stator body (3) is provided with a needle column (6) and a cycloid wheel (7), and the needle column (6) is inserted and arranged on the inner cavity wall of the stator body (3); the outer edge of the cycloid wheel (7) is provided with arc-shaped cycloid teeth (701), and the inner cavity is provided with a second inner gear ring (702), and the second inner gear ring (702) is meshed with a transmission shaft (9); The transmission shaft (9) comprises a rotating shaft (901), a first transmission gear (902) being provided at one end of the rotating shaft (901), and a second transmission gear (903) being provided at the other end, the first transmission gear (902) being meshed with the second inner gear ring (702); A planetary transmission mounting plate (11) is fixedly provided on the stator body (3), a rotating shaft (901) is inserted in the center of the planetary transmission mounting plate (11), a second transmission gear (903) is located above the planetary transmission mounting plate (11), and three sets of planetary gears (10) are evenly distributed and meshed around the second transmission gear (903); The planetary gear (10) is meshed with an output shaft (5), a front housing (4) is fixedly mounted on the planetary transmission mounting plate (11), the output shaft (5) is inserted into the front housing (4), and an end of the output shaft extends out of the end of the front housing (4).

2. The cycloid motor with high torque output according to claim 1, characterized in that: The arcuate cycloid teeth (701) are tangentially meshed with the outer edge surface of the needle column (6), and the cycloid wheel (7) oscillates eccentrically in the inner cavity of the stator body (3).

3. The cycloid motor with high torque output according to claim 1, characterized in that: The inner diameter of the second inner gear ring (702) is larger than the outer diameter of the first transmission gear (902), and the first transmission gear (902) is eccentrically meshed with the second inner gear ring (702) for transmission.

4. The cycloid motor with high torque output according to claim 1, characterized in that: A T-shaped shaft hole (1101) is provided at the center of the planetary transmission mounting plate (11), a first sliding bearing (8) is provided in the T-shaped shaft hole (1101), the first sliding bearing (8) is a split T-shaped sliding bearing, and a rotating shaft (901) is provided in the shaft hole of the first sliding bearing (8).

5. The cycloid motor with high torque output according to claim 1, characterized in that: A circular shaft hole (1102) is provided on the planetary transmission mounting plate (11), the circular shaft hole (1102) is positioned to match the planetary gear (10), a third sliding bearing (13) is inserted into the circular shaft hole (1102), and the planetary gear (10) is arranged in the third sliding bearing 13.

6. The cycloid motor with high torque output according to claim 1, characterized in that: The output shaft (5) comprises a third cylindrical shaft (501), the third cylindrical shaft (501) being inserted into the front housing (4) and extending out of the end of the front housing (4), a fourth cylindrical shaft (502) being provided at the end of the third cylindrical shaft (501), the diameter of the third cylindrical shaft (501) being smaller than the diameter of the fourth cylindrical shaft (502), a first inner gear ring (503) being provided inside the fourth cylindrical shaft (502), and the first inner gear ring (503) being meshed with the planetary gear (10).

7. The cycloid motor with high torque output according to claim 6, characterized in that: The front housing (4) is a stepped cylindrical structure, comprising a first cylindrical shaft (401), a second cylindrical shaft (402) being provided at one end of the first cylindrical shaft (401), the diameter of the first cylindrical shaft (401) being smaller than that of the second cylindrical shaft (402), a first shaft hole (403) being provided through the front housing (4) along the central axis, a second annular groove (405) being provided at the bottom end of the second cylindrical shaft (402), a first annular groove (404) being provided below the second annular groove (405), the diameter of the first annular groove (404) being smaller than that of the second annular groove (405), a third cylindrical shaft (501) being provided in the first shaft hole (403), a fourth cylindrical shaft (502) being provided in the first annular groove (404), and a planetary transmission mounting plate (11) being provided in the second annular groove (405).

8. The cycloid motor with high torque output according to claim 5, characterized in that: An annular sealing groove (304) is provided on the end surface of the stator body (3) in contact with the planetary transmission mounting plate (11), and a sealing ring is provided in the annular sealing groove (304).

9. The cycloid motor with high torque output according to claim 7, characterized in that: A second sliding bearing (12) is disposed in the first annular groove (404), and a fourth cylindrical shaft (502) is disposed in the shaft hole of the second sliding bearing (12).

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