Primary planetary gear set and planetary reducer thereof

Abstract

The utility model relates to the technical field of transmission actuators, in particular to a primary planetary gear set and a planetary reducer thereof, which comprise a planet carrier, a fixing cover, a primary sun gear and a primary planet gear, a plurality of sleeving shafts are arranged on one end face of the planet carrier, the primary planet gear is arranged in the middle of the sleeving shafts, the primary sun gear is arranged in the center of the planet carrier, and the primary sun gear is arranged on the fixing cover. A plurality of fixing shafts are arranged on one end face of the planet carrier, horizontally-protruding limiting bosses are arranged on the edges of the fixing shafts, the height of the limiting bosses is consistent with the height of the first-stage planet gears, the ends of the fixing shafts are fixedly connected with the fixing holes, and the first-stage planet gears are covered with the fixing covers. The bottom end face of the fixing cover and the limiting boss form a limiting abutting structure, the situation that the first-stage planet wheel moves in the axial direction can be effectively prevented, the situation that the first-stage planet wheel is damaged due to tooth clamping with a first-stage sun wheel or a first-stage gear ring is reduced, the service life of the planetary gear set and the planetary reducer is prolonged, and the service life of the planetary reducer is prolonged. And meanwhile, tooth clamping faults are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of transmission actuators, in particular to a primary planetary gear set and a planetary reducer thereof. Background Art

[0002] The single-row single-stage planetary gear mechanism consists of a sun gear, a planetary gear carrier, a planetary gear and a ring gear. The planetary gear can rotate around the planetary axis and revolve around the sun gear. The sun gear and the planetary gear are externally meshed, and the two rotate in opposite directions; the planetary gear and the ring gear are internally meshed, and the two rotate in the same direction.

[0003] Among them, in the existing automotive electrical drive, a planetary reducer is generally provided to reduce the speed of the motor and increase the torque. In today's new energy vehicles, the generator technology has been abandoned, which has greatly reduced the noise of new energy vehicles. The overall development trend of the electrical and mechanical structure of new energy vehicles is moving towards low noise. In the planetary reducer, the sun gear and the planetary gear adopt the helical gear structure and are widely used. Among them, the helical gear has the advantages of small size, light weight, large torque transmission, smooth starting and low transmission noise. Therefore, the use of helical gears has played a key noise reduction effect for the planetary reducer.

[0004] However, the axial force of the helical gear is harmful to the gear transmission. It increases the friction between the devices and makes the devices prone to wear or damage. The axial force is caused by the helix angle. The larger the helix angle, the greater the axial force generated.

[0005] The existing planetary gears are generally mounted on the periphery of the planetary carrier, and the planetary gears composed of helical gears are prone to axial movement due to the vibration of driving. This phenomenon will cause the contact angle between the planetary gears composed of helical gears and the sun gear or ring gear to become larger, making it more prone to tooth jamming or damage. Therefore, in view of these current situations, there is an urgent need to develop a first-stage planetary gear set and a planetary reducer thereof to meet the needs of actual use. Utility Model Content

[0006] The utility model aims to provide a first-stage planetary gear set and a planetary reducer thereof, which are used to solve the defect that the planetary gears in the existing planetary gear set move axially, causing the planetary gears constituting the helical gears to get stuck or damaged with the sun gear or the ring gear.

[0007] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0008] A first-stage planetary gear set includes a planetary carrier, a fixed cover, a first-stage sun gear and several first-stage planetary gears. Several sleeve shafts are provided at the periphery of one end face of the planetary carrier, a rotatable first-stage planetary gear is sleeved on the middle part of the sleeve shaft, a first-stage sun gear is provided at the center of the planetary carrier, the side wall of the first-stage sun gear is meshed with several first-stage planetary gears for transmission, the fixed cover is used to fix the first-stage planetary gear in the middle part of the sleeve shaft, several fixed shafts are provided on one end face of the planetary carrier close to the first-stage planetary gear, a horizontally raised limiting boss is provided on the edge of the fixed shaft, the height of the limiting boss is consistent with the height of the first-stage planetary gear, several fixing holes matching the fixed shaft are opened in the middle part of the fixed cover, the end of the fixed shaft is fixedly connected to the fixing hole, the fixed cover covers the top of the first-stage planetary gear, and the bottom end face of the fixed cover forms a limiting conflict structure with the limiting boss.

[0009] In the above description, as a further solution, a plurality of socket holes are provided in the middle of the fixed cover, and the end of the socket shaft away from the planet carrier is plugged and positioned with the socket holes.

[0010] In the above description, as a further solution, the fixed shaft is arranged between two adjacent sleeve shafts, and a plurality of fixed shafts and sleeve shafts are distributed in a circular array structure.

[0011] In the above description, as a further solution, a clearance hole matching the primary sun gear is opened at the center of the fixed cover, and the primary sun gear extends to the interior of the planet carrier through the clearance hole.

[0012] In the above description, as a further solution, the first-stage sun gear and the first-stage planetary gear are both composed of helical gears.

[0013] The planetary reducer comprises a hollow structure housing, a primary ring gear, a secondary ring gear, a secondary planetary gear set, an output shaft rotatably arranged at one end of the housing and the above-mentioned primary planetary gear set, the primary ring gear and the secondary ring gear are sequentially arranged on the inner wall of the housing, the secondary planetary gear set comprises a plurality of secondary planetary gears and a secondary sun gear, the secondary planetary gear is rotatably arranged at the periphery of one end of the output shaft, the secondary sun gear is fixedly connected to the center of an end face of the planet carrier away from the primary planetary gear, the side wall of the secondary sun gear is meshed with a plurality of secondary planetary gears for transmission, and a plurality of secondary planetary gears are meshed with the inner wall of the secondary ring gear for transmission, the primary planetary gear set is meshed with the inner wall of the primary ring gear through the primary planetary gear, so that the primary planetary gear set is rotatably arranged inside the primary ring gear, an end cover is provided at one end of the housing away from the output shaft, and the inner end face of the end cover is pressed against the primary ring gear and the fixed cover.

[0014] In the above description, as a further solution, the secondary planetary gear, the secondary sun gear and the secondary ring gear are all straight tooth structures, the secondary ring gear is an internal tooth groove structure, and the secondary ring gear and the inner wall of the shell are an integrally formed structure, the secondary sun gear is a straight tooth column structure, and the secondary sun gear and the planetary carrier are an integrally formed structure.

[0015] In the above description, as a further solution, the inner wall of the shell is provided with a plurality of horizontally arranged limit cams, and the side wall of the first-stage gear ring close to the side of the second-stage planetary gear set is provided with a plurality of limit key grooves, one end of the limit key groove is an open structure, and the first-stage gear ring is clearance-fitted with the limit cam through the limit key groove.

[0016] In the above description, as a further solution, a plug-in hole is opened at one end of the shell away from the end cover, the middle part of the output shaft is rotatably arranged inside the plug-in hole, and the end of the output shaft close to the plug-in hole is a hollow structure, and the inner wall of the output shaft is a connecting tooth groove.

[0017] The beneficial effects produced by the utility model are as follows:

[0018] The first-stage planetary gear set and planetary reducer of the present application are provided with a horizontally raised limiting boss between the fixed cover and the fixed shaft through the edge of the fixed shaft, and the height of the limiting boss is consistent with the height of the first-stage planetary gear. A limiting abutment structure is formed by the bottom end surface of the fixed cover and the limiting boss, which can effectively prevent the first-stage planetary gear from moving in the axial direction, reduce the damage caused by the first-stage planetary gear and the first-stage sun gear or the first-stage ring gear due to tooth jamming, improve the service life of the planetary gear set and the planetary reducer, and reduce the occurrence of tooth jamming failures. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structural decomposition of the primary planetary gear set of the utility model;

[0020] Figure 2 It is a schematic diagram of the three-dimensional structure of the planetary reducer of the utility model;

[0021] Figure 3 This is a schematic diagram of the three-dimensional structure of the planetary reducer of the utility model;

[0022] Figure 4 for Figure 3 A is a schematic diagram of the partially enlarged structure of the middle part;

[0023] Figure 5 for Figure 3 A schematic diagram of the partially enlarged structure of B in the middle;

[0024] Figure 6 It is a cross-sectional structural schematic diagram of the planetary reducer of the utility model;

[0025] In the figure: 1-housing, 11-plug-in through hole, 12-secondary gear ring, 13-limiting convex key, 2-first-stage planetary gear set, 21-planet carrier, 211-fixed shaft, 2111-limiting boss, 212-sleeve shaft, 22-first-stage planetary gear, 23-first-stage sun gear, 24-fixing cover, 241-fixing hole, 242-sleeve hole, 243-avoidance hole, 3-end cover, 4-first-stage gear ring, 41-limiting keyway, 5-secondary planetary gear set, 51-secondary planetary gear, 52-secondary sun gear, 6-output shaft, 61-connecting tooth groove. DETAILED DESCRIPTION

[0026] Embodiment 1:

[0027] In order to facilitate the understanding of those skilled in the art, the present invention is further described below in conjunction with the embodiments and drawings, and the contents mentioned in the implementation modes are not intended to limit the present invention. The present invention is described in detail below in conjunction with the drawings.

[0028] See also Figure 1 The first-stage planetary gear set 2 specifically implemented includes a planet carrier 21, a fixed cover 24, a first-stage sun gear 23 and three first-stage planetary gears 22. Three sleeve shafts 212 are provided at the periphery of one end surface of the planet carrier 21. A rotatable first-stage planetary gear 22 is sleeved on the middle part of the sleeve shaft 212. A first-stage sun gear 23 is provided at the center of the planet carrier 21. The side wall of the first-stage sun gear 23 is meshed with the three first-stage planetary gears 22 for transmission, and the first-stage sun gear 23 and the first-stage planetary gears 22 are both composed of helical gears.

[0029] The fixing cover 24 is used to fix the first-stage planetary gear 22 and keep it in the middle of the sleeve shaft 212. Three fixing shafts 211 are provided on one end face of the planet carrier 21 close to the first-stage planetary gear 22. The edge of the fixing shaft 211 is provided with a horizontally raised limiting boss 2111. The height of the limiting boss 2111 is consistent with the height of the first-stage planetary gear 22. Three fixing holes 241 matching the fixing shaft 211 are opened in the middle of the fixing cover 24. A clearance hole 243 matching the first-stage sun gear 23 is opened in the center of the fixing cover 24. The first-stage sun gear 23 extends to the interior of the planet carrier 21 through the clearance hole 243. The end of the fixing shaft 211 is fixedly connected to the fixing hole 241. The fixing cover 24 covers the top of the first-stage planetary gear 22, and the bottom end face of the fixing cover 24 forms a limiting conflict structure with the limiting boss 2111.

[0030] Between the fixed cover 24 and the fixed shaft 211, a horizontally raised limiting boss 2111 is provided through the edge of the fixed shaft 211, and the height of the limiting boss 2111 is consistent with the height of the first-stage planetary gear 22. A limiting abutment structure is formed by the bottom end surface of the fixed cover 24 and the limiting boss 2111, which can effectively prevent the first-stage planetary gear 22 from moving in the axial direction, reduce the damage caused by the first-stage planetary gear 22 and the first-stage sun gear 23 or the first-stage ring gear 4 due to tooth jamming, improve the service life of the planetary gear set and the planetary reducer, and reduce the possibility of tooth jamming failure.

[0031] Specifically, Figure 1 As shown, three socket holes 242 are provided in the middle of the fixed cover 24, and one end of the socket shaft 212 away from the planet carrier 21 is plugged and positioned with the socket hole 242, and the fixed shaft 211 is arranged between two adjacent socket shafts 212, and the three fixed shafts 211 and the socket shafts 212 are arranged in a circular array. By distributing the fixed shaft 211 and the socket shaft 212 in a circular array, the force between the fixed cover 24 and the planet carrier 21 can be evenly distributed on the limiting bosses 2111 of the three fixed shafts 211, effectively avoiding the fixed cover 24 from applying excessive pressure on the end face of the primary planetary gear 22, which causes unnecessary resistance to the rotation of the primary planetary gear 22, and can prevent the primary planetary gear 22 from moving in the axial direction on the one hand, and maintain the normal rotation of the primary planetary gear 22 on the other hand.

[0032] Embodiment 2:

[0033] See also Figure 2-6 The planetary reducer specifically implemented includes a hollow housing 1, a primary gear ring 4, a secondary gear ring 12, a secondary planetary gear set 5, an output shaft 6 rotatably arranged at one end of the housing 1, and the above-mentioned primary planetary gear set 2. The primary gear ring 4 and the secondary gear ring 12 are sequentially arranged on the inner wall of the housing 1. The secondary planetary gear set 5 includes three secondary planetary gears 51 and a secondary sun gear 52. The secondary planetary gear 51 is rotatably arranged at the periphery of one end of the output shaft 6. The secondary sun gear 52 is fixedly connected to the planet carrier. 21 is away from the center of one end face of the primary planetary gear 22, the side wall of the secondary sun gear 52 is meshed with the three secondary planetary gears 51, the three secondary planetary gears 51 are meshed with the inner wall of the secondary ring gear 12, the primary planetary gear set 2 is meshed with the inner wall of the primary ring gear 4 through the primary planetary gear 22, so that the primary planetary gear set 2 is rotatably arranged inside the primary ring gear 4, and an end cover 3 is provided at one end of the housing 1 away from the output shaft 6, and the inner end face of the end cover 3 is pressed against the primary ring gear 4 and the fixed cover 24.

[0034] Preferably, Figure 3As shown, the secondary planetary gear 51, the secondary sun gear 52 and the secondary ring gear 12 are all straight tooth structures, the secondary ring gear 12 is an internal tooth groove structure, and the secondary ring gear 12 and the inner wall of the housing 1 are an integrally formed structure, the secondary sun gear 52 has a straight tooth column structure, and the secondary sun gear 52 and the planet carrier 21 are an integrally formed structure.

[0035] Preferably, Figure 4 and Figure 5 As shown, the inner wall of the shell 1 is provided with three horizontally arranged limit cams 13, and the side wall of the first-stage ring gear 4 close to the side of the second-stage planetary gear set 5 is provided with three limit key grooves 41, one end of which is an open structure, and the first-stage ring gear 4 is clearance-matched with the limit cam 13 through the limit key groove 41, and the limit key groove 41 is clearance-matched with the limit cam 13. The designer can limit the position of the first-stage ring gear 4 inside the shell 1 by controlling the length of the limit key groove 41 and the limit cam 13, and position the first-stage ring gear 4 at the stroke position by the limit key groove 41 having an open structure at one end, thereby effectively preventing the first-stage ring gear 4 from moving in the shell 1, and further improving the matching precision between the first-stage ring gear 4 and the first-stage planetary gear 22.

[0036] Preferably, Figure 2 As shown, a plug-in hole 11 is opened at one end of the shell 1 away from the end cover 3, the middle part of the output shaft 6 is rotatably arranged inside the plug-in hole 11, and the end of the output shaft 6 close to the plug-in hole 11 is a hollow structure, and the inner wall of the output shaft 6 is a connecting tooth groove 61. The external actuator can extend to the inside of the connecting tooth groove 61 and be fixedly connected with the output shaft 6 to output the power of the planetary reducer through deceleration and torque increase.

[0037] The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Although the utility model is disclosed as a preferred embodiment as above, it is not used to limit the utility model. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical content disclosed above without departing from the scope of the technical solution of the utility model. However, any simple modification, equivalent change and modification made to the above embodiments according to the technology of the utility model, which does not depart from the content of the technical solution of the utility model, belongs to the scope of the technical solution of the utility model.

Claims

1. A first-stage planetary gear set, characterized in that: include: A planet carrier, wherein a plurality of sleeve shafts are provided at the periphery of one end surface of the planet carrier, a rotatable primary planetary gear is sleeved in the middle of the sleeve shaft, a primary sun gear is provided at the center of the planet carrier, and a side wall of the primary sun gear is meshed with the plurality of primary planetary gears for transmission; A fixing cover is used to fix the first-stage planetary gear to the middle part of the sleeve shaft. A plurality of fixing shafts are provided on one end face of the planet carrier close to the first-stage planetary gear. A horizontally raised limiting boss is provided on the edge of the fixing shaft. The height of the limiting boss is consistent with the height of the first-stage planetary gear. A plurality of fixing holes matching the fixing shaft are provided in the middle part of the fixing cover. The ends of the fixing shaft are fixedly connected to the fixing holes. The fixing cover covers the top of the first-stage planetary gear, and the bottom end face of the fixing cover forms a limiting conflict structure with the limiting boss.

2. The primary planetary gear set according to claim 1, characterized in that: A plurality of sleeve holes are provided in the middle of the fixed cover, and one end of the sleeve shaft away from the planet carrier is plugged and positioned with the sleeve hole.

3. The primary planetary gear set according to claim 1, characterized in that: The fixed shaft is arranged between two adjacent sleeve shafts, and a plurality of fixed shafts and sleeve shafts are distributed and arranged in a circular array structure.

4. The primary planetary gear set according to claim 1, characterized in that: A clearance hole matching the primary sun gear is provided at the center of the fixed cover, and the primary sun gear extends to the interior of the planet carrier through the clearance hole.

5. The primary planetary gear set according to any one of claims 1 to 4, characterized in that: The primary sun gear and the primary planet gear are both composed of helical gears.

6. A planetary reducer, comprising a hollow housing, a primary ring gear, a secondary ring gear, a secondary planetary gear set, an output shaft rotatably arranged at one end of the housing, and a primary planetary gear set according to any one of claims 1 to 5, characterized in that: The primary ring gear and the secondary ring gear are sequentially arranged on the inner wall of the shell, the secondary planetary gear set includes a plurality of secondary planetary gears and a secondary sun gear, the secondary planetary gear is rotatably arranged at the periphery of one end of the output shaft, the secondary sun gear is fixedly connected to the center of an end face of the planet carrier away from the primary planetary gear, the side wall of the secondary sun gear is meshed with the plurality of secondary planetary gears, and the plurality of secondary planetary gears are meshed with the inner wall of the secondary ring gear, the primary planetary gear set is meshed with the inner wall of the primary ring gear through the primary planetary gear, so that the primary planetary gear set is rotatably arranged inside the primary ring gear, and an end cover is provided at one end of the shell away from the output shaft, and the inner end face of the end cover is pressed against the primary ring gear and the fixed cover.

7. The planetary reducer according to claim 6, characterized in that: The secondary planetary gear, secondary sun gear and secondary ring gear are all spur gear structures, the secondary ring gear is an internal tooth groove structure, and the secondary ring gear and the inner wall of the shell are an integrally formed structure, the secondary sun gear has a spur gear column structure, and the secondary sun gear and the planet carrier are an integrally formed structure.

8. The planetary reducer according to claim 7, characterized in that: The inner wall of the shell is provided with a plurality of horizontally arranged limit cams, and the side wall of the first-stage gear ring close to the side of the second-stage planetary gear set is provided with a plurality of limit key grooves, one end of the limit key groove is an open structure, and the first-stage gear ring is clearance-matched with the limit cam through the limit key groove.

9. The planetary reducer according to claim 6, characterized in that: The shell has an end away from the end cover with a plug-in hole, the middle of the output shaft is rotatably arranged inside the plug-in hole, and the end of the output shaft close to the plug-in hole is a hollow structure, and the inside of the output shaft is a connecting tooth groove.

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