Improved speed reducer

Abstract

The improved speed reducer comprises a motor part and a speed reduction part, the speed reduction part comprises a shell, a sun wheel shaft, a planet wheel, a gear ring and a planet carrier are assembled in the shell, and the sun wheel shaft is connected with the motor part. The planet carrier is provided with an assembling cavity used for assembling a planet wheel, the planet carrier is provided with a pin shaft used for installing the planet wheel, and the two ends of the pin shaft are installed on the carrier walls on the two sides of the assembling cavity. One end of the pin shaft is a large-head end, a first through hole is formed in the frame wall corresponding to the large-head end, the inner wall of the first through hole is divided into a light section and a threaded section, the large-head end is located in the light section, the end face, facing one side of the assembly cavity, of the large-head end protrudes out of the cavity wall, and a pressing block pressing the pin shaft is assembled in the threaded section. Compared with the prior art, the pre-tightening force of the bearing can be accurately controlled, the service life of the bearing is prolonged, and the transmission stability is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of speed reducers, and in particular relates to an improved speed reducer. Background Art

[0002] Reducers, as important transmission equipment, are widely used in various industrial fields. Planetary reducers, with their compact structure, high transmission efficiency, and high output torque, play a key role in servo drive systems. Existing planetary reducers have some shortcomings in the installation and fixation of the planetary gears. The planetary gears are typically mounted on the planetary carrier using pins and bearings, but existing structures cannot accurately control the preload force within the planetary gear bearings. Excessive or insufficient preload force can affect bearing life and transmission stability, and may even cause bearing damage and transmission failure.

[0003] Therefore, based on some of the above situations in the prior art, this application has been further designed and improved. Utility Model Content

[0004] In order to solve the above technical problems, the present invention solves them through the following technical solutions.

[0005] An improved reducer comprises a motor and a reduction unit. The reduction unit includes a housing within which a sun gear shaft, planetary gears, a ring gear, and a planetary carrier are assembled. The sun gear shaft is connected to the motor. The planetary carrier is provided with an assembly cavity for assembling the planetary gears. A pin for mounting the planetary gears is mounted on the planetary carrier, with both ends of the pin mounted on the frame walls on either side of the assembly cavity. One end of the pin is a large end. A first through-hole is provided in the frame wall corresponding to the large end. The inner wall of the first through-hole is divided into a smooth section and a threaded section. The large end is located within the smooth section, with the end of the large end facing the assembly cavity protruding from the cavity wall. A pressure block is mounted in the threaded section to apply pressure to the pin. The other end of the pin is a small end. A second through-hole is provided in the frame wall corresponding to the small end for mounting the small end. A first gasket is mounted on the side of the second through-hole facing the assembly cavity, with the end of the first gasket facing the assembly cavity protruding from the cavity wall. The planetary gears are mounted on the pin via two sets of symmetrically arranged tapered roller bearings. Of the two sets of tapered roller bearings, the inner ring of one set abuts against the big head end, and the inner ring of the other set abuts against the first spacer.

[0006] Compared with the prior art, the present application has the following beneficial effects: by adopting the design of the pin shaft clamping block structure, the bearing preload force can be accurately controlled, thereby improving the bearing life and transmission stability.

[0007] As a preferred technical solution for the improved reducer, specifically, a through slot for mounting a tapered roller bearing is provided in the center of the planetary gear. The through slot has a positioning structure located between the two sets of tapered roller bearings. This positioning structure comprises a retaining spring and two sets of second washers. The retaining spring is fixedly engaged with the inner wall of the through slot. The two sets of second washers respectively abut against either side of the retaining spring, and the tapered roller bearings abut against the second washers. The retaining spring and second washers cooperate to position the facing surfaces of the bearings, ensuring accurate installation of the bearings and improving transmission stability.

[0008] As a preferred technical solution for the improved reducer, specifically, a positioning groove is provided on the side of the small end of the pin, and a positioning hole is provided on one side of the second through hole. A set screw is installed in the positioning hole, and the bottom of the set screw abuts against the positioning groove. The positioning groove and set screw cooperate to further improve the stability of the pin and prevent it from rotating.

[0009] As a preferred technical solution for the improved reducer, specifically, a bearing hole is provided at the center of the planet carrier, and the sun gear shaft is assembled and connected to the bearing hole via a thrust cylindrical roller bearing. The thrust cylindrical roller bearing can withstand large axial forces, ensuring stable operation of the sun gear.

[0010] As a preferred technical solution for the improved speed reducer, specifically, the sun gear shaft and the planetary gears have a helical helical gear structure, which reduces operating noise and improves transmission stability.

[0011] As a preferred technical solution for an improved reducer, specifically, the planet carrier is provided with a raised step, which is provided with a shaft portion. The shaft portion is mounted with an angular contact bearing. The inner ring of the angular contact bearing abuts the raised step, and the outer ring of the angular contact bearing is assembled and connected to the housing. The angular contact bearing can withstand large axial forces, improving the stability of the reducer.

[0012] As a preferred technical solution for this improved reducer, an oil seal seat is mounted on one side of the housing, against which the outer ring of the angular contact bearing on the same side abuts. The oil seal seat is provided with a mounting groove, within which a wave spring is mounted to abut the angular contact bearing. After the housing is assembled, the wave spring is compressed to generate a preload force, pre-tightening the bearing clearance and preventing movement caused by the bearing clearance.

[0013] As a preferred technical solution for the improved speed reducer, specifically, the planetary gear is provided with a plurality of weight-reducing holes. This design reduces the weight of the planetary gear, reduces the starting inertia, and improves the starting speed and responsiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a structural diagram of the improved reducer.

[0015] Figure 2 for Figure 1 A partial enlarged view of point A in the middle.

[0016] Figure 3 This is the structural explosion diagram of the improved reducer.

[0017] Figure 4 This is the structural explosion diagram of the planetary carrier related structure.

[0018] The following is a description of the symbols in the drawings of the specification:

[0019] 100. Motor unit; 200. Housing; 201. Oil seal seat; 202. Wave spring; 210. Sun gear shaft; 211. Thrust cylindrical roller bearing; 220. Planet gear; 221. Tapered roller bearing; 222. Circlip; 223. Second gasket; 224. Lightening hole; 230. Ring gear; 240. Planet carrier; 241. Assembly cavity; 242. First through hole; 243. Second through hole; 244. Angular contact bearing; 250. Pin; 251. Big head end; 252. Small head end; 253. Pressing block; 254. First gasket; 255. Positioning groove; 256. Set screw. DETAILED DESCRIPTION

[0020] The present invention will be described in further detail below with reference to the accompanying drawings and specific implementations.

[0021] In the following embodiments, the same or similar numbers throughout represent the same or similar components or components with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be understood as limiting the present invention.

[0022] In the description of the present invention, it should be understood that the terms: center, longitudinal, transverse, length, width, thickness, up, down, front, back, left, right, vertical, horizontal, top, bottom, inside, outside, clockwise, counterclockwise, etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and therefore cannot be understood as limiting the present invention. In addition, the terms: first, second, etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features shown. In the description of the present invention, unless otherwise clearly specified and limited, the terms: install, connect, connect, etc. should be understood in a broad sense, and ordinary technicians in this field can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0023] Reference Figures 1 to 4An improved reducer includes a motor unit 100 and a reduction unit. The reduction unit includes a housing 200. The housing 200 contains a sun gear shaft 210, planetary gears 220, a ring gear 230, and a planet carrier 240. The sun gear shaft 210 is connected to the motor unit 100. The planet carrier 240 is provided with an assembly cavity 241 for assembling the planetary gears 220. The planet carrier 240 is equipped with a pin 250 for mounting the planetary gears 220. The ends of the pin 250 are mounted on the frame walls on both sides of the assembly cavity 241.

[0024] Compared to the prior art, the present invention can precisely control the preload force. Its structure is as follows: One end of the pin 250 is a large end 251. A first through hole 242 is provided on the wall corresponding to the large end 251. The inner wall of the first through hole 242 is divided into a smooth section and a threaded section. The large end 251 is located within the smooth section, and the end surface of the large end 251 facing the assembly cavity 241 protrudes from the cavity wall. A pressing block 253 for applying pressure to the pin 250 is installed in the threaded section. The other end of the pin 250 is a small end 252. A second through hole 243 for mounting the small end 252 is provided on the wall corresponding to the small end 252. A first gasket 254 is installed on the side of the second through hole 243 facing the assembly cavity 241. The end surface of the first gasket 254 facing the assembly cavity 241 protrudes from the cavity wall. A positioning groove 255 is provided on the side of the small end 252 of the pin 250, and a positioning hole is provided on one side of the second through hole 243. A set screw 256 is installed in the positioning hole, and the bottom of the set screw 256 abuts against the positioning groove 255. The cooperation between the positioning groove 255 and the set screw 256 further improves the stability of the pin 250 and prevents it from rotating.

[0025] Furthermore, the planetary gear 220 is mounted on the pin 250 via two sets of symmetrically arranged tapered roller bearings 221. The inner ring of one set of tapered roller bearings 221 abuts against the large end 251, while the inner ring of the other set abuts against the first washer 254. A through slot for mounting the tapered roller bearings 221 is provided in the center of the planetary gear 220. This slot is provided with a positioning structure between the two sets of tapered roller bearings 221. This positioning structure includes a retaining spring 222 and two sets of second washer 223. The retaining spring 222 is fixedly engaged with the inner wall of the slot. The two sets of second washer 223 abut against either side of the retaining spring 222, respectively. The tapered roller bearings 221 abut against the second washer 223. The retaining spring 222 and the second washer 223 cooperate to position the facing surfaces of the bearings, ensuring accurate installation of the bearings and improving transmission stability.

[0026] To ensure the stability of the planetary gear transmission, a bearing hole is centrally located on the planet carrier 240. The sun gear shaft 210 is assembled and connected to the bearing hole via a thrust cylindrical roller bearing 211. The thrust cylindrical roller bearing 211 can withstand significant axial forces, ensuring stable operation of the sun gear. The sun gear shaft 210 and the planetary gears 220 feature a helical helical gear structure. This reduces operating noise and improves transmission smoothness. The planet carrier 240 is provided with a raised step, which is supported by a shaft. An angular contact bearing 244 is mounted on the shaft. The inner ring of the angular contact bearing 244 rests on the raised step, and the outer ring of the angular contact bearing 244 is assembled and connected to the housing 200. The angular contact bearing 244 can withstand significant axial forces, improving the stability of the reducer. An oil seal seat 201 is mounted on one side of the housing 200, and the outer ring of the angular contact bearing 244 on the same side rests against the oil seal seat 201. The oil seal seat 201 is provided with a mounting groove, in which a wave spring 202 is mounted to abut against the angular contact bearing 244. After the housing 200 is assembled, the wave spring 202 is compressed to generate a preload force, which preloads the bearing clearance and prevents movement caused by the bearing clearance.

[0027] In addition, a plurality of weight-reducing holes 224 are arranged around the planetary gear 220. This design reduces the weight of the planetary gear 220, reduces the starting inertia, improves the starting speed and responsiveness, and is also beneficial to heat dissipation.

[0028] The protection scope of the present invention includes but is not limited to the above embodiments. The protection scope of the present invention is based on the claims. Any replacement, deformation, and improvement of the technology that can be easily thought of by technicians in this field fall within the protection scope of the present invention.

Claims

1. An improved reducer, comprising a motor unit (100) and a reduction unit, wherein the reduction unit comprises a housing (200), wherein a sun gear shaft (210), planetary gears (220), a ring gear (230) and a planet carrier (240) are assembled in the housing (200), wherein the sun gear shaft (210) is connected to the motor unit (100); wherein the planet carrier (240) is provided with an assembly cavity (241) for assembling the planetary gears (220), wherein the planet carrier (240) is provided with a pin shaft (250) for mounting the planetary gears (220), wherein both ends of the pin shaft (250) are mounted on the frame walls on both sides of the assembly cavity (241); wherein One end of the pin shaft (250) is a large head end (251), and a first through hole (242) is provided on the frame wall corresponding to the large head end (251). The inner wall of the first through hole (242) is divided into a light section and a threaded section. The large head end (251) is located in the light section, and the end surface of the large head end (251) facing the assembly cavity (241) protrudes from the cavity wall. A pressing block (253) for applying pressure to the pin shaft (250) is installed in the threaded section. The other end of the pin shaft (250) is a small end (252), and a second through hole (243) for mounting the small end (252) is provided on the frame wall corresponding to the small end (252). A first gasket (254) is mounted on a side of the second through hole (243) facing the assembly cavity (241), and an end surface of the first gasket (254) facing the assembly cavity (241) protrudes from the cavity wall. The planetary gear (220) is mounted on the pin (250) via two sets of symmetrically arranged tapered roller bearings (221); of the two sets of tapered roller bearings (221), the inner ring of one set abuts against the large end (251), and the inner ring of the other set abuts against the first gasket (254).

2. An improved reducer according to claim 1, characterized in that: A through groove for mounting a tapered roller bearing (221) is provided in the middle of the planetary gear (220), and a positioning structure is provided in the middle of the two groups of tapered roller bearings (221). The positioning structure comprises a retaining spring (222) and two groups of second gaskets (223). The retaining spring (222) is fixedly engaged with the inner wall of the through groove, and the two groups of second gaskets (223) are respectively abutted against both sides of the retaining spring (222), and the tapered roller bearings (221) are abutted against the second gaskets.

3. The improved reducer according to claim 1, characterized in that: A positioning groove (255) is provided on the side of the small head end (252) of the pin shaft (250), and a positioning hole is provided on one side of the second through hole (243). A set screw (256) is installed in the positioning hole, and the bottom of the set screw (256) is against the positioning groove (255).

4. The improved reducer according to claim 1, characterized in that: A bearing hole is provided at the center of the planet carrier (240), and the sun gear shaft (210) is assembled and connected to the bearing hole via a thrust cylindrical roller bearing (211).

5. The improved reducer according to claim 1, characterized in that: The sun gear shaft (210) and the planet gear (220) are of a spiral helical gear structure.

6. The improved reducer according to claim 1, characterized in that: The planet carrier (240) is provided with convex steps on both axial sides, a shaft portion is provided on the convex steps, an angular contact bearing (244) is assembled on the shaft portion, the inner ring of the angular contact bearing (244) is against the convex steps, and the outer ring of the angular contact bearing (244) is assembled and connected to the housing (200).

7. The improved reducer according to claim 6, characterized in that: An oil seal seat (201) is mounted on one side of the housing (200), and the outer ring of the angular contact bearing (244) located on the same side abuts against the oil seal seat (201); a mounting groove is provided on the oil seal seat (201), and a wave spring (202) is mounted in the mounting groove to abut against the angular contact bearing (244).

8. The improved reducer according to claim 1, characterized in that: A plurality of weight-reducing holes (224) are distributed around the planetary wheel (220).

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