Planetary gearbox

Abstract

The utility model relates to a planetary gear box, which belongs to the technical field of planetary gear boxes and comprises a box body, the box body comprises a containing cavity, a cover plate is arranged at one end of the box body, a fixing block is arranged at the other end of the box body, a straight inner gear is integrally formed on the inner wall of the containing cavity, an inclined inner gear is coaxially arranged on the fixing block, and the fixing block and the inclined inner gear are integrally formed. The inner wall of the containing cavity is provided with a fixing groove for the fixing block to be embedded, the outer wall of the fixing block is attached to the inner wall of the fixing groove, the outer wall of the inclined inner gear is attached to the inner wall of the containing cavity, and the end, away from the fixing block, of the inclined inner gear is attached to the end face, away from the cover plate, of the straight inner gear. And the box body is provided with a mounting piece for fixing the cover plate and a connecting piece for fixing the fixing block. The planetary gear box has the effect of improving the sealing performance of the planetary gear box.

Description

Technical Field

[0001] The utility model relates to the technical field of planetary gear boxes, in particular to a planetary gear box. Background Art

[0002] A planetary gearbox is a mechanism in which multiple planetary gears rotate around a sun gear. It is also a mechanism that reduces the transmission speed ratio while proportionally increasing the motor torque.

[0003] The planetary gearbox in the prior art includes a box body, which includes a accommodating cavity for accommodating a gear structure. A cover plate is provided at one end of the box body, and a bottom plate is provided at the other end of the box body. The cover plate and the bottom plate are respectively located at the two ends of the box body, and the cover plate and the bottom plate are used to block the connection between the accommodating cavity and the outside world; the gear structure includes a helical internal gear and a spur internal gear arranged on the inner wall of the accommodating cavity. An engaging groove for the helical internal gear to engage is opened on the inner wall of the accommodating cavity. The spur internal gear is equipped with a spur gear set, and the helical internal gear is equipped with a helical gear set.

[0004] A clamping block is provided on the outer wall of the helical internal gear, and a clamping groove for the clamping block to be engaged is opened on the base plate. The cooperation between the clamping block and the clamping groove fixes the helical internal gear to the base plate. However, it is found in actual use that the gear oil in the gear box will overflow from the gap at the connection between the helical internal gear and the base plate, affecting the normal use of the planetary gear box. Utility Model Content

[0005] In order to improve the sealing performance of a planetary gearbox, the present application provides a planetary gearbox.

[0006] The present application provides a planetary gearbox, which adopts the following technical solution:

[0007] A planetary gearbox for use with a motor, comprising a box body, the box body comprising a accommodating chamber, a cover plate being provided at one end of the box body, a fixing block being provided at the other end of the box body, a spur internal gear being integrally formed on the inner wall of the accommodating chamber, a helical internal gear being coaxially provided on the fixing block, the fixing block and the helical internal gear being integrally formed, a fixing groove for engagement of the fixing block being provided on the inner wall of the accommodating chamber, an outer wall of the fixing block being fitted with the inner wall of the fixing groove, an outer wall of the helical internal gear being fitted with the inner wall of the accommodating chamber, an end of the helical internal gear away from the fixing block being fitted with an end face of the spur internal gear away from the cover plate, and the box body being provided with a mounting piece for fixing the cover plate and a connecting piece for fixing the fixing block.

[0008] By adopting the above technical solution, the fixed block and the helical internal gear are integrally formed, and the fixed block can be embedded in the housing as a whole during actual installation, which not only makes it difficult for the gear oil to overflow from the connection between the fixed block and the housing, thereby improving the sealing of the planetary gearbox, but also can shorten the overall length of the planetary gearbox to a certain extent, reducing the production and transportation costs; in addition, the setting of the fixed block and the helical internal gear being integrally formed makes it difficult for the gear oil to overflow from the connection between the fixed block and the helical internal gear, thereby further improving the sealing of the planetary gearbox.

[0009] Preferably, the fixing block is provided with a fixing bolt, a fixing through hole is penetrated through the fixing block for the fixing bolt to pass through, a fixing threaded hole cooperating with the fixing bolt is provided on the motor end cover, a fixing countersunk hole is provided on the fixing block for the screw head of the fixing bolt to be engaged, and the fixing block and the end of the box body away from the cover plate are both in contact with the motor end cover.

[0010] By adopting the above technical solution, the fixing block and the motor are fixed by the cooperation of the fixing bolts and the fixing threaded holes, which facilitates the fixation between the fixing block and the motor. By setting the fixing countersunk holes, the space utilization in the planetary gearbox can be improved, further reducing the production and transportation costs.

[0011] Preferably, a helical gear set and a sealing gasket are provided in the helical internal gear, the sealing gasket is located between the helical gear set and the fixed block, and the sealing gasket is in contact with the fixed block.

[0012] By adopting the above technical solution and designing the sealing gasket, the gear oil is not easy to overflow from the planetary gear box from the fixed through hole, thereby improving the sealing performance of the planetary gear box.

[0013] Preferably, sealing teeth meshing with the helical internal gear are provided on the outer peripheral wall of the sealing gasket.

[0014] By adopting the above technical solution and setting the sealing teeth, it is further made difficult for the gear oil to overflow from the planetary gear box from the fixed through hole, thereby improving the sealing performance of the planetary gear box.

[0015] Preferably, the connecting member includes a connecting bolt, a connecting through hole for the connecting bolt to pass through is opened on the side wall of the box body, the connecting through hole is connected with the fixing groove, and a connecting threaded hole matching with the connecting bolt is opened on the side wall of the fixing block, and the connecting threaded hole is connected with the connecting through hole after the box body is rotated.

[0016] By adopting the above technical solution, the box body is fixed to the fixing block by connecting bolts, which facilitates the fixation between the box body and the fixing block. By setting the connecting countersunk holes, the aesthetics of the planetary gearbox is improved, and the connecting bolts are not easy to cause damage to other planetary gearboxes during the transportation of the planetary gearbox.

[0017] Preferably, a positioning ball is rotatably connected to the fixed block, and a positioning groove for the positioning ball to slide is provided on the fixed block, and the opening of the positioning groove is located on the side wall of the fixed block. A positioning elastic member for pushing the positioning ball to slide out of the positioning groove is provided on the fixed block, and a positioning hole for the positioning ball to be embedded is provided on the inner wall of the fixed groove. When the box body is rotated until the positioning ball is embedded in the positioning hole, the connecting threaded hole is connected to the connecting through hole.

[0018] By adopting the above technical solution, when the box body is rotated until the positioning groove is connected with the positioning hole, the positioning ball can slide under the action of the positioning elastic part to be embedded in the positioning hole. At this time, the connecting threaded hole is connected with the connecting through hole, which facilitates the box body to be rotated until the connecting threaded hole is connected with the connecting through hole, thereby facilitating the fixation between the box body and the fixed block.

[0019] Preferably, an abutment ring is coaxially provided on the cover plate, and when the cover plate is in contact with the end of the box body away from the motor, the outer wall of the abutment ring is in contact with the gear teeth of the spur internal gear.

[0020] By adopting the above technical solution and setting the abutment ring, the reliability of closing the accommodating cavity by the cover plate is improved to a certain extent, thereby improving the sealing performance of the planetary gearbox.

[0021] Preferably, a positioning block corresponding to the mounting threaded hole is provided at one end of the box body facing the cover plate, the mounting threaded hole passes through the positioning block, and a positioning groove for the positioning block to be engaged is provided on the cover plate.

[0022] By adopting the above technical solution, the cover plate and the box body can be easily fixed with the cooperation of the positioning block and the positioning groove.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. The fixing block and the helical internal gear are integrally formed, so the fixing block can be embedded in the housing as a whole during actual installation, which not only makes it difficult for the gear oil to overflow from the connection between the fixing block and the housing, thus improving the sealing of the planetary gearbox, but also shortens the overall length of the planetary gearbox to a certain extent, reducing the production and transportation costs;

[0025] 2. The integral molding of the fixed block and the helical internal gear makes it difficult for the gear oil to overflow from the connection between the fixed block and the helical internal gear, further improving the sealing performance of the planetary gearbox. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of Example 1 of the present application.

[0027] Figure 2 It is a schematic diagram of the split structure of Example 1 of the present application.

[0028] Figure 3 This is a structural schematic diagram from another perspective of Example 1 of the present application.

[0029] Figure 4 It is a cross-sectional view of the overall structure in Example 1 of the present application.

[0030] Figure 5 This is a schematic diagram of the coordination between the fixed block and the box body of Example 2 of the present application.

[0031] Explanation of the reference numerals: 1. housing; 11. spur internal gear; 111. spur gear set; 13. fixing groove; 131. positioning hole; 14. positioning block; 15. connecting bolt; 151. connecting through hole; 152. connecting countersunk hole; 16. mounting threaded hole; 2. cover plate; 21. mounting bolt; 211. mounting through hole; 212. mounting countersunk hole; 22. abutment ring; 23. positioning groove; 3. fixing block; 31. helical internal gear; 311. helical gear set; 32. fixing bolt; 321. fixing through hole; 322. fixing countersunk hole; 33. sealing gasket; 331. sealing tooth; 34. connecting threaded hole; 35. positioning ball; 351. positioning slide groove; 352. positioning spring; 4. motor; 41. fixing threaded hole. DETAILED DESCRIPTION

[0032] The following is combined with Figure 1-5 The utility model is described in further detail.

[0033] The embodiment of the present application discloses a planetary gearbox for use with a motor 4 .

[0034] Embodiment 1:

[0035] Reference Figure 1 and Figure 2 , including a box body 1, which is arranged in a cylindrical shape. The box body 1 includes a accommodating cavity, which is arranged along the length direction of the box body 1 and passes through the box body 1. A cover plate 2 is provided at one end of the box body 1, and a cylindrical fixing block 3 is provided at the other end of the box body 1. The cover plate 2 and the fixing block 3 are arranged to block the connection between the accommodating cavity and the outside world.

[0036] Reference Figure 2 and Figure 3A spur internal gear 11 is integrally formed on the inner wall of the accommodating cavity. The spur internal gear 11 is coaxially arranged with the housing 1 and arranged along the length direction of the housing 1. A helical internal gear 31 is coaxially arranged on the fixing block 3. The fixing block 3 and the helical internal gear 31 are integrally formed. A fixing groove 13 for the fixing block 3 to be engaged is opened on the inner wall of the accommodating cavity. The outer wall of the fixing block 3 fits with the inner wall of the fixing groove 13. After the fixing block 3 is embedded in the fixing groove 13, the outer wall of the helical internal gear 31 fits with the inner wall of the accommodating cavity. The end of the helical internal gear 31 away from the fixing block 3 fits with the end face of the spur internal gear 11 away from the cover plate 2. The end face of the fixing block 3 away from the helical internal gear 31 is flush with the end face of the housing 1 away from the cover plate 2.

[0037] Since the fixing block 3 and the helical internal gear 31 are integrally formed, the fixing block 3 can be integrally embedded in the housing 1 during actual installation, which not only makes it difficult for the gear oil to overflow from the connection between the fixing block 3 and the housing 1, thereby improving the sealing of the planetary gearbox, but also can shorten the overall length of the planetary gearbox to a certain extent, thereby reducing the production and transportation costs; in addition, the integrally formed setting of the fixing block 3 and the helical internal gear 31 makes it difficult for the gear oil to overflow from the connection between the fixing block 3 and the helical internal gear 31, thereby further improving the sealing of the planetary gearbox.

[0038] Reference Figure 2 , Figure 3 and Figure 4 The helical internal gear 31 is provided with a helical gear set 311 matched with the helical internal gear 31, the spur internal gear 11 is provided with a spur gear set 111 matched with the spur internal gear 11, and the planetary gearbox includes a gearbox output shaft, so that the output shaft of the motor 4 is connected to the input shaft of the helical gear set 311, the output shaft of the helical gear set 311 is connected to the input shaft of the spur gear set 111, and the output shaft of the spur gear set 111 is connected to the output shaft of the gearbox to achieve transmission. The fixing block 3 is provided with four fixing bolts 32, and the four fixing bolts 32 are arranged in a circle with the axis of the fixing block 3 as the center. The fixing block 3 is fixed to the motor 4 by the fixing bolts 32, and a fixing through hole 321 for the fixing bolt 32 to pass through is opened on the fixing block 3, and a fixing threaded hole 41 matched with the fixing bolt 32 is opened on the end cover of the motor 4, and the output shaft of the motor 4 passes through the fixing block 3 and extends to the helical internal gear 31. After the fixing block 3 is fixed to the motor 4 by the cooperation of the fixing bolts 32 and the fixing threaded holes 41, the helical gear set 311, the housing 1, the spur gear set 111 and the cover plate 2 are installed in sequence. At this time, the fixing block 3 and the end of the housing 1 in the planetary gearbox away from the cover plate 2 are both in contact with the end cover of the motor 4.

[0039] Reference Figure 2A fixing countersunk hole 322 for the screw head of the fixing bolt 32 to engage is provided on the fixing block 3, which improves the space utilization in the planetary gear box and reduces the production and transportation costs; a sealing gasket 33 is also provided in the helical internal gear 31, and the sealing gasket 33 is located between the helical gear set 311 and the fixing block 3, so that the sealing gasket 33 is in contact with the end surface of the fixing block 3, and the sealing gasket 33 can be fixed to the fixing block 3 by gluing. Through the design of the sealing gasket 33, the gear oil is not easy to overflow from the planetary gear box from the fixing through hole 321, which further improves the sealing performance of the planetary gear box.

[0040] Reference Figure 2 and Figure 3 The connecting parts include four connecting bolts 15. Four connecting through holes 151 for the connecting bolts 15 to pass through are provided on the side wall of the housing 1. The connecting through holes 151 are communicated with the fixing grooves 13. The four connecting through holes 151 are arranged in a circular array with the axis of the housing 1 as the center. A connecting threaded hole 34 cooperating with the connecting bolt 15 is provided on the side wall of the fixing block 3. After the housing 1 is rotated, the connecting threaded hole 34 is communicated with the connecting through hole 151. The housing 1 is fixed to the fixing block 3 by the connecting bolts 15, which facilitates the fixation between the housing 1 and the fixing block 3. A connecting countersunk hole 152 for the screw head of the connecting bolt 15 to be engaged is also provided on the housing 1, which improves the aesthetics of the planetary gearbox to a certain extent.

[0041] Reference Figure 3 An abutment ring 22 is coaxially provided at one end of the cover plate 2 facing the box body 1, and the abutment ring 22 is integrally formed with the cover plate 2. When the cover plate 2 is in contact with the end of the box body 1 away from the motor 4, the outer wall of the abutment ring 22 is in contact with the gear teeth of the spur internal gear 11. Through the provision of the abutment ring 22, the reliability of closing the accommodating cavity by the cover plate 2 is improved to a certain extent, and the sealing performance of the planetary gear box is improved.

[0042] Reference Figure 2 and Figure 3 The mounting parts include four mounting bolts 21. Four mounting through holes 211 for the mounting bolts 21 to pass through are formed at one end of the cover plate 2 away from the abutment ring 22. The four mounting through holes 211 are arranged in a circular array with the axis of the cover plate 2 as the center. A mounting threaded hole 16 cooperating with the mounting bolts 21 is formed at one end of the housing 1 away from the motor 4. The cover plate 2 is fixed to the housing 1 under the cooperation of the mounting bolts 21 and the mounting through holes 211, which facilitates the fixation of the cover plate 2. A mounting countersunk hole 212 for the screw head of the mounting bolt 21 to be engaged is formed at one end of the cover plate 2 away from the housing 1. The arrangement of the mounting countersunk hole 212 improves the aesthetics of the planetary gearbox.

[0043] Reference Figure 1 and Figure 2The box body 1 is also provided with a positioning block 14 corresponding to the mounting threaded hole 16. The mounting threaded hole 16 passes through the positioning block 14. The cover plate 2 is provided with a positioning groove 23 for the positioning block 14 to be embedded. After the positioning block 14 is embedded in the positioning groove 23, the mounting threaded hole 16 is connected to the mounting through hole 211. With the cooperation of the positioning block 14 and the positioning groove 23, the cover plate 2 and the box body 1 are easily fixed.

[0044] The implementation principle of a planetary gearbox in Example 1 of the present application is as follows: first, the fixing block 3 and the motor 4 are fixed by the cooperation of the fixing bolts 32 and the fixing threaded holes 41, and the sealing gasket 33 is fitted with the fixing block 3, and then the helical gear set 311, the housing 1 and the spur gear set 111 are installed in sequence, and the housing 1 and the fixing block 3 are fixed by the cooperation of the connecting bolts 15 and the connecting threaded holes 34, and finally the cover plate 2 is installed, and after the positioning block 14 is embedded in the positioning groove 23, the cover plate 2 and the housing 1 are fixed by the cooperation of the mounting bolts 21 and the mounting threaded holes 16 to complete the installation.

[0045] Embodiment 2:

[0046] The difference from Example 1 is that, referring to Figure 5 A sealing tooth 331 meshing with the helical internal gear 31 is integrally formed on the outer peripheral wall of the sealing gasket 33. The setting of the sealing tooth 331 further makes it difficult for the gear oil to overflow from the planetary gear box from the fixed through hole 321, thereby improving the sealing performance of the planetary gear box.

[0047] Reference Figure 5 , so that four positioning balls 35 are rotatably connected to the fixed block 3, and the four positioning balls 35 are arranged in a circular array with the axis of the fixed block 3 as the center. The four positioning balls 35 all slide along the radial direction of the fixed block 3, and a positioning groove 351 for the positioning balls 35 to slide is provided on the fixed block 3. The opening of the positioning groove 351 is located on the side wall of the fixed block 3, and a positioning elastic member for pushing the positioning balls 35 to slide out of the positioning groove 351 is provided on the fixed block 3. In the embodiment of the present application, the positioning elastic member is a positioning spring 352. One end of the spring 352 is pressed against the inner wall of the positioning groove 351, and the other end of the positioning spring 352 is pressed against the positioning ball 35. A positioning hole 131 for the positioning ball 35 to be embedded is opened on the inner wall of the fixed groove 13. When the box body 1 is rotated until the positioning groove 351 is connected with the positioning hole 131, the positioning ball 35 can slide under the action of the positioning spring 352 to be embedded in the positioning hole 131. At this time, the connecting threaded hole 34 is connected with the connecting through hole 151, which facilitates the box body 1 to be able to rotate until the connecting threaded hole 34 is connected with the connecting through hole 151.

[0048] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A planetary gearbox for use with a motor (4), comprising a housing (1), the housing (1) comprising a receiving cavity, a cover plate (2) being provided at one end of the housing (1), and a fixing block (3) being provided at the other end of the housing (1), characterized in that: A spur internal gear (11) is integrally formed on the inner wall of the accommodating cavity, a helical internal gear (31) is coaxially provided on the fixing block (3), the fixing block (3) and the helical internal gear (31) are integrally formed, a fixing groove (13) for the fixing block (3) to be engaged is provided on the inner wall of the accommodating cavity, the outer wall of the fixing block (3) is in contact with the inner wall of the fixing groove (13), the outer wall of the helical internal gear (31) is in contact with the inner wall of the accommodating cavity, the end of the helical internal gear (31) away from the fixing block (3) is in contact with the end face of the spur internal gear (11) away from the cover plate (2), and the housing (1) is provided with a mounting member for fixing the cover plate (2) and a connecting member for fixing the fixing block (3).

2. The planetary gearbox according to claim 1, characterized in that: The fixing block (3) is provided with a fixing bolt (32), and a fixing through hole (321) is formed on the fixing block (3) for the fixing bolt (32) to pass through. The end cover of the motor (4) is provided with a fixing threaded hole (41) that cooperates with the fixing bolt (32), and the fixing block (3) is provided with a fixing countersunk hole (322) for the screw head of the fixing bolt (32) to engage. The fixing block (3) and the end of the box body (1) away from the cover plate (2) are both in contact with the end cover of the motor (4).

3. The planetary gearbox according to claim 1, characterized in that: The helical internal gear (31) is provided with a helical gear set (311) and a sealing gasket (33); the sealing gasket (33) is located between the helical gear set (311) and the fixed block (3); the sealing gasket (33) is in close contact with the fixed block (3).

4. The planetary gearbox according to claim 3, characterized in that: The outer peripheral wall of the sealing gasket (33) is provided with sealing teeth (331) meshing with the helical internal gear (31).

5. The planetary gearbox according to claim 2, characterized in that: The connecting member comprises a connecting bolt (15); a connecting through hole (151) for the connecting bolt (15) to pass through is provided on the side wall of the box body (1); the connecting through hole (151) is communicated with the fixing groove (13); a connecting threaded hole (34) cooperating with the connecting bolt (15) is provided on the side wall of the fixing block (3); after the box body (1) is rotated, the connecting threaded hole (34) is communicated with the connecting through hole (151).

6. The planetary gearbox according to claim 5, characterized in that: A positioning ball (35) is rotatably connected to the fixed block (3), a positioning groove (351) for the positioning ball (35) to slide is provided on the fixed block (3), an opening of the positioning groove (351) is located on the side wall of the fixed block (3), a positioning elastic member is provided on the fixed block (3) for pushing the positioning ball (35) to slide outward of the positioning groove (351), a positioning hole (131) for the positioning ball (35) to be embedded is provided on the inner wall of the fixed groove (13), and when the box body (1) is rotated until the positioning ball (35) is embedded in the positioning hole (131), the connecting threaded hole (34) is connected to the connecting through hole (151).

7. The planetary gearbox according to claim 1, characterized in that: An abutment ring (22) is coaxially provided on the cover plate (2). When the cover plate (2) is in contact with the end of the box body (1) away from the motor (4), the outer wall of the abutment ring (22) is in contact with the gear teeth of the spur internal gear (11).

8. The planetary gearbox according to claim 7, characterized in that: A positioning block (14) corresponding to the mounting threaded hole (16) is provided at one end of the box body (1) facing the cover plate (2); the mounting threaded hole (16) passes through the positioning block (14); and a positioning groove (23) for the positioning block (14) to be engaged is provided on the cover plate (2).

Images