Star wheel speed reducer

Abstract

The utility model relates to the field of speed reducers, and provides a star wheel speed reducer. Comprising a shell which is fixedly installed on a base. An input shaft and an output shaft are rotatably supported at the two ends of the shell respectively, a middle shaft is installed between the input shaft and the output shaft, the other end of the input shaft is connected with the middle shaft, a circle of inner teeth are machined in the shell, and the inner teeth of the middle shell are in corresponding meshing transmission with the planet gears. The inner gear ring is directly machined on the inner wall of the shell, installation of the independent inner gear ring in a transmission system is reduced, and therefore the outer diameter and the weight of the star speed reducer can be reduced; the two ends of the intermediate shaft are inserted into the inner holes in the corresponding ends of the input shaft and the output shaft correspondingly, the overall length of the speed reducer can be reduced, and therefore the size of the speed reducer is reduced; by arranging the two eccentric sun gears and the two eccentric planet gears, it is ensured that meshing transmission is always generated between the planet gears and the inner gear ring, and the load capacity of the speed reducer is improved.

Description

Technical Field

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

[0002] The planetary gear reducer generally installs the sun gear, planetary gear, planet carrier and inner gear ring between the input shaft and the output shaft. The sun gear is driven to rotate by the input shaft, and the sun gear meshes with the planetary gear. The meshing transmission between the planetary gear and the inner gear ring drives the planet carrier to rotate, and finally drives the output of the output shaft through the planet carrier. Planetary gear reducers can withstand higher loads through multi-stage transmission deceleration, so they are widely used in industrial sectors such as lifting and transportation, engineering machinery, metallurgy, mining, petrochemicals, weapons, and aerospace.

[0003] When planetary gear reducers are used in special occasions such as aerospace, there are strict requirements on their weight, volume, etc. On the basis of not changing their transmission ratio, it is necessary to design their internal structure compactly, reduce the internal components, and optimize the connection method of the internal transmission structure. Summary of the invention

[0004] In order to meet the requirements of light weight and compact structure of a planetary gear reducer in special application occasions, the utility model provides a planetary gear reducer.

[0005] The technical solution adopted by the utility model is:

[0006] A planetary gear reducer comprises a housing, which is fixedly mounted on a base; an input shaft and an output shaft are rotatably supported at both ends of the housing, respectively; the input shaft and the output shaft are coaxially arranged, an intermediate shaft is installed between the input shaft and the output shaft, a sun gear is fixedly installed on the intermediate shaft, a planet carrier is installed in the housing, the planet carrier is rotatably supported on the intermediate shaft through two bearings, a plurality of groups of circumferentially uniformly distributed planetary gears are rotatably supported on the planet carrier through pins, the sun gear and the planetary gears are meshed for transmission, the housing comprises an input end housing, an intermediate housing and an output end housing, adjacent housings are fixedly connected by bolts, the input shaft has two bearings The planetary carrier is rotatably supported in the input end housing, one end of the input shaft extends out of the input end housing, and the other end of the input shaft is connected to the intermediate shaft; a circle of internal teeth is processed inside the intermediate housing, and the internal teeth of the intermediate housing are correspondingly meshed with the planetary gears for transmission; the planetary carrier includes an input end planetary carrier and an output end planetary carrier, the input end planetary carrier is rotatably supported on the intermediate shaft through bearings, and the output end planetary carrier is rotatably supported on the output end housing through bearings, and the pin shaft is connected between the input end planetary carrier and the output end planetary carrier; one end of the output shaft is fixedly connected to the output end planetary carrier, and the other end of the output shaft extends out of the output end housing.

[0007] Furthermore, the sun gear includes a first sun gear and a second sun gear, the first sun gear and the second sun gear are eccentrically mounted on the intermediate shaft, and a phase difference between the first sun gear and the second sun gear is 180°.

[0008] Furthermore, the planetary gear comprises a first planetary gear and a second planetary gear, the first planetary gear and the second planetary gear are eccentrically mounted on the pin shaft, and the phase difference between the first planetary gear and the second planetary gear is 180°.

[0009] Furthermore, one end of the input shaft is provided with an inner hole, the interior of the inner hole is processed with internal teeth, one end of the intermediate shaft is inserted into the inner hole of the input shaft, the insertion section of the intermediate shaft is processed with external teeth, and the intermediate shaft is driven by meshing the external teeth with the internal teeth of the input shaft.

[0010] Furthermore, both ends of the pin shaft are connected to the corresponding planetary carrier through a shaft sleeve, the shaft sleeve is fixedly installed in the mounting hole of the planetary carrier, and one end of the shaft sleeve is provided with a limiting ring for limiting the position of the planetary carrier.

[0011] Furthermore, an inner hole is provided at one end of the output shaft close to the intermediate shaft, and the end of the intermediate shaft corresponding to the output shaft is inserted into the inner hole.

[0012] Furthermore, a limit ring is installed on the end surface of the output-end planet carrier close to the output shaft, and the limit ring is limitedly matched with the shoulder of the output shaft.

[0013] After adopting the above technical scheme, the beneficial effects of the utility model are:

[0014] By directly machining an inner gear ring on the inner wall of the shell, the installation of a separate inner gear ring in the transmission system can be reduced, thereby reducing the outer diameter and weight of the star-type reducer; by respectively inserting the two ends of the intermediate shaft into the inner holes at the corresponding ends of the input shaft and the output shaft, the overall length of the reducer can be reduced, thereby reducing the volume of the reducer; by providing two eccentric sun gears and eccentric planetary gears, it is ensured that there is always a planetary gear meshing with the inner gear ring for transmission, thereby increasing the load capacity of the reducer. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is the main sectional view of the utility model.

[0016] Figure 2 It is a side view of the utility model.

[0017] In the figure: base 1, input shaft 2, intermediate shaft 3, first sun gear 4, second sun gear 5, output shaft 6, input end housing 7, intermediate housing 8, output end housing 9, input end planet carrier 10, output end planet carrier 11, pin 12, bushing 13, first planet gear 14, second planet gear 15, inner ring gear 16. DETAILED DESCRIPTION

[0018] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings:

[0019] like Figure 1 As shown, a planetary gear reducer is composed of a base 1, a housing, an input shaft 2, an intermediate shaft 3, a first sun gear 4, a second sun gear 5, a planet carrier, a planetary assembly, an output shaft 6 and other components.

[0020] The shell is fixedly mounted on the base 1, and the shell is composed of three shell parts, namely, an input end shell 7, an intermediate shell 8 and an output end shell 9. Each shell part is distributed and fixedly mounted on the base 1, and adjacent shell parts are fixedly connected by bolts to form an integral shell.

[0021] The input shaft 2 is rotatably supported in the input end housing 7 through two bearings, one end of the input shaft 2 extends out of the housing, and the extended end of the input shaft 2 is connected to the motor input. The other end of the input shaft 2 is provided with an axial shaft hole, and the inner wall of the shaft hole is processed with internal teeth.

[0022] The intermediate shaft 3 is coaxially arranged with the input shaft 2. The end of the intermediate shaft 3 corresponding to the input shaft 2 is inserted into the shaft hole of the input shaft 2. The insertion section of the intermediate shaft 3 is processed with external teeth that match the internal teeth of the input shaft 2. Through the cooperation of the internal teeth and the external teeth, the transmission between the input shaft 2 and the intermediate shaft 3 is realized. The first sun gear 4 and the second sun gear 5 are installed on the intermediate shaft 3. The first sun gear 4 and the second sun gear 5 are eccentrically installed on the intermediate shaft 3, and the phase difference between the first sun gear 4 and the second sun gear 5 is 180°.

[0023] The planet carrier is composed of an input planet carrier 10 and an output planet carrier 11. The input planet carrier 10 and the output planet carrier 11 are sleeved on the intermediate shaft 3 and distributed on both sides of the sun gear. The input planet carrier 10 is close to one side of the input shaft and is rotatably supported on the intermediate shaft 3 through a bearing installed on its inner hole, and the output planet carrier 11 is rotatably supported on the intermediate housing 8 through a bearing sleeved on its outer wall. 3-4 sets of planetary assemblies are installed between the input planet carrier 10 and the output planet carrier 11.

[0024] The planetary assembly includes a pin 12, and the two ends of the pin 12 are connected to the input end planetary carrier 10 and the output end planetary carrier 11 through a sleeve 13. The sleeve 13 is fixedly installed in the mounting hole of the planetary carrier, and one end of the sleeve 13 is provided with a limit ring for limiting the position of the planetary carrier. The pin 12 is installed with a first planetary gear 14 and a second planetary gear 15. The first planetary gear 14 and the second planetary gear 15 are eccentrically installed on the pin 12, and the phase difference between the first planetary gear 14 and the second planetary gear 15 is 180°. The first planetary gear 14 and the second planetary gear 15 are meshed with the first sun gear 4 and the second sun gear 5 respectively. A circle of inner gear ring 16 is processed on the inner wall of the intermediate housing 8, and the first planetary gear 14 and the second planetary gear 15 are meshed with the inner gear ring 16 for transmission.

[0025] The output shaft 6 is rotatably supported on the output end housing 9 through a bearing, one end of the output shaft 6 extends out of the output end housing 9 and outputs torque, the other end of the output shaft 6 is inserted into the inner hole of the output end planetary carrier 11 and is fixedly connected to the output end planetary carrier 11 through a key, and a limit ring is installed on the end face of the output end planetary carrier 11 close to the output shaft 6, and the limit ring is limitedly matched with the shaft shoulder of the output shaft. The output shaft 6 is coaxially arranged with the intermediate shaft 3, and an inner hole is provided at one end of the output shaft 6 close to the intermediate shaft 3, and the corresponding end of the intermediate shaft 3 is inserted into the inner hole of the output shaft 6.

[0026] When the input shaft 2 rotates under the drive of the motor, the input shaft 2 drives the intermediate shaft 3, and the two sun gears of different phases on the intermediate shaft 3 drive the corresponding planetary gears at intervals, and the planetary gears of different phases mesh with the inner gear ring 16 of the intermediate housing at intervals and drive the output end planetary carrier 11 to rotate through the pin shaft, and drive the output shaft 6 to output through the output end planetary carrier 11. In the whole transmission process, there are planetary gears in the four sets of planetary assemblies that mesh with the inner gear ring 16 to improve the load capacity of the planetary reducer.

[0027] The two ends of the intermediate shaft 3 in the present technical solution are respectively inserted into the input shaft 2 and the output shaft 6, and the inner ring gear 16 is directly processed on the intermediate housing 8, which can effectively reduce the number of parts and external dimensions of the reducer, reduce the weight of the reducer, and ensure its compact structure.

Claims

1. A planetary gear reducer, comprising a housing, which is fixedly mounted on a base; an input shaft and an output shaft are rotatably supported at both ends of the housing, respectively, the input shaft and the output shaft are coaxially arranged, an intermediate shaft is installed between the input shaft and the output shaft, a sun gear is fixedly installed on the intermediate shaft, a planet carrier is installed in the housing, the planet carrier is rotatably supported on the intermediate shaft through two bearings, a plurality of groups of circumferentially uniformly distributed planetary gears are rotatably supported on the planet carrier through pins, the sun gear is meshed with the planetary gears for transmission, and the characteristics are as follows: The housing comprises an input housing, an intermediate housing and an output housing, and adjacent housings are fixedly connected by bolts. The input shaft is rotatably supported in the input housing by two bearings, one end of the input shaft extends out of the input housing, and the other end of the input shaft is connected to the intermediate shaft; a circle of internal teeth is processed inside the intermediate housing, and the internal teeth of the intermediate housing are correspondingly meshed with the planetary gears for transmission; the planet carrier comprises an input planet carrier and an output planet carrier, the input planet carrier is rotatably supported on the intermediate shaft through bearings, and the output planet carrier is rotatably supported on the output housing through bearings, and the pin shaft is connected between the input planet carrier and the output planet carrier; one end of the output shaft is fixedly connected to the output planet carrier, and the other end of the output shaft extends out of the output housing.

2. A planetary gear reducer according to claim 1, characterized in that: The sun gear comprises a first sun gear and a second sun gear, wherein the first sun gear and the second sun gear are eccentrically mounted on the intermediate shaft, and a phase difference between the first sun gear and the second sun gear is 180°.

3. A planetary reducer according to claim 2, characterized in that: The planetary gear comprises a first planetary gear and a second planetary gear, the first planetary gear and the second planetary gear are eccentrically mounted on the pin shaft, and the phase difference between the first planetary gear and the second planetary gear is 180°.

4. A planetary reducer according to claim 1, characterized in that: One end of the input shaft is provided with an inner hole, the interior of the inner hole is processed with internal teeth, one end of the intermediate shaft is inserted into the inner hole of the input shaft, the insertion section of the intermediate shaft is processed with external teeth, and the intermediate shaft is driven by meshing the external teeth with the internal teeth of the input shaft.

5. A planetary reducer according to claim 1, characterized in that: The two ends of the pin shaft are connected to the corresponding planetary frame through a shaft sleeve, the shaft sleeve is fixedly installed in the mounting hole of the planetary frame, and one end of the shaft sleeve is provided with a limiting ring for limiting the position of the planetary frame.

6. A planetary reducer according to claim 1, characterized in that: An end of the output shaft close to the intermediate shaft is provided with an inner hole, and the end of the intermediate shaft corresponding to the output shaft is inserted into the inner hole.

7. A planetary reducer according to claim 1, characterized in that: A limit ring is installed on the end surface of the output-end planet carrier close to the output shaft, and the limit ring is limitedly matched with the shaft shoulder of the output shaft.

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