CN220870016U - Speed reducing structure - Google Patents

Abstract

The utility model provides a speed reduction structure, which comprises a shell, and a primary speed reduction and a secondary speed reduction arranged in the shell, wherein the primary speed reduction comprises a primary planet wheel and a primary wheel shaft, the primary planet wheel is sleeved on the primary wheel shaft, the secondary speed reduction comprises a secondary planet wheel and a secondary wheel shaft, and the secondary planet wheel is sleeved on the secondary wheel shaft; the one-level planet wheel is located the axial side of second grade planet wheel, the one-level shaft orientation one side of second grade planet wheel has seted up the one-level oil duct, the one-level oil duct intercommunication in the one-level planet wheel with between the one-level shaft, the second grade oil duct has been seted up towards one side of one-level planet wheel to the second grade wheel axle, the second grade oil duct intercommunication in the second grade planet wheel with between the second grade wheel axle, the one-level planet wheel with the second grade planet wheel can stir jointly lubricating oil in the casing carries out integrative lubrication, promotes lubricated effect, guarantees operational reliability.

Description

Speed reducing structure

Technical Field

The utility model relates to the technical field of speed reducers, in particular to a speed reducing structure.

Background

The wheel side drive belongs to a driving mode of a pure electric automobile, and has the advantages of short power transmission route, flexible arrangement, low vehicle bottom plate and the like. In the existing wheel-side driving electric automobile structure, a motor is most commonly connected with a half shaft through a speed reducer, and the power transmission sequence is as follows: the motor is decelerated through the speed reducer, and power is transmitted to the half shaft of the rear axle to drive the vehicle to run.

The purpose of the retarder is to increase the driving force of the vehicle to meet or correct the force match of the entire transmission system. For example, CN203186075U discloses a hub motor driving axle for electric automobile, the motor is connected with a primary speed reducer, the primary speed reducer is connected with a secondary speed reducer through a half shaft, the secondary speed reducer is connected with a hub, wherein the primary speed reducer and the secondary speed reducer are planetary speed reducers, namely, have sun gears, and are meshed with a plurality of planetary gears around the outer ring of the sun gears, and the purpose of speed reduction is achieved through multistage gear arrangement. The components must withstand high rotational speeds and high loads and therefore have particularly high requirements for lubrication performance.

At present, a planetary reducer adopts splash lubrication, namely, a planetary gear agitates lubricating oil in a box body to lubricate, and the primary reducer and the secondary reducer are split, namely, are independently lubricated, so that the primary planetary gear and the secondary planetary gear share a cavity, the integrated lubrication is realized, the lubrication performance is improved, and the running reliability is ensured.

Disclosure of utility model

Therefore, the utility model aims to provide a speed reducing structure which effectively improves the lubrication effect and ensures reliable operation.

The speed reduction structure comprises a shell, and a primary speed reduction and a secondary speed reduction which are arranged in the shell, wherein the primary speed reduction comprises a primary planet wheel and a primary wheel shaft, the primary planet wheel is sleeved on the primary wheel shaft, the secondary speed reduction comprises a secondary planet wheel and a secondary wheel shaft, and the secondary planet wheel is sleeved on the secondary wheel shaft;

The primary planet wheel is located on the axial side of the secondary planet wheel, a primary oil duct is formed in one side, facing the secondary planet wheel, of the primary wheel shaft, the primary oil duct is communicated between the primary planet wheel and the primary wheel shaft, a secondary oil duct is formed in one side, facing the primary planet wheel, of the secondary wheel shaft, and the secondary oil duct is communicated between the secondary planet wheel and the secondary wheel shaft.

As a preferred embodiment, the primary speed reduction comprises a primary gear ring, the primary gear ring is wound outside the primary planet wheel, the primary gear ring is meshed with the primary planet wheel, and the meshing position of the primary gear ring and the primary planet wheel is opposite to a secondary oil duct of the secondary wheel shaft.

As the preferred embodiment, the secondary speed reduction further comprises a secondary planet carrier, the left end of the secondary planet carrier is connected with the half shaft, the right end of the secondary planet carrier is connected with the motor, a left oil seal is arranged between the left end of the secondary planet carrier and the shell, the motor is connected with the shell, and a right oil seal is arranged between the right end of the secondary planet carrier and the motor.

As a preferred embodiment, the primary planet carrier is rotatably arranged inside the secondary planet carrier, and the primary planet wheels are arranged on the primary planet carrier through the primary wheel shafts.

As a preferred embodiment, an intermediate oil seal is arranged inside the left end of the secondary planet carrier, and the primary speed reduction is positioned between the intermediate oil seal and the secondary planet wheels.

As a preferred embodiment, the secondary planet carrier comprises a secondary second carrier body and a secondary first carrier body which are arranged from left to right, the secondary planet wheels are connected to the secondary first carrier body through secondary wheel shafts, and the primary gear ring of the primary speed reduction is fixed between the secondary second carrier body and the secondary first carrier body.

As a preferred embodiment, the two-stage reduction further includes:

The secondary gear ring is wound outside the secondary planet gears, the secondary gear ring is meshed with the secondary planet gears, and the secondary gear ring is fixed on the inner wall of the shell;

The secondary sun gear is fixed on the primary planet carrier for primary speed reduction, and the secondary sun gear is meshed with the secondary planet gear.

As a preferred embodiment, the secondary planet gear comprises a secondary first gear and a secondary second gear, the secondary first gear and the secondary second gear are axially and integrally connected, the secondary first gear is meshed with the secondary sun gear, the secondary second gear is meshed with the secondary gear ring, and the diameter of the secondary first gear is larger than that of the secondary second gear.

As a preferred embodiment, a motor shaft of the motor is connected with a speed reducing shaft, the speed reducing shaft sequentially penetrates through the primary speed reduction and the secondary speed reduction, a primary sun gear is arranged on the speed reducing shaft, and the primary sun gear is meshed with the primary planet gear.

As a preferred embodiment, the electric machine is an axial flux electric machine.

Compared with the prior art, the technical scheme has the following advantages:

The primary speed reduction and the secondary speed reduction are jointly arranged inside the shell, namely, the primary speed reduction and the secondary speed reduction are jointly arranged in a cavity, the primary planetary gear and the secondary planetary gear can jointly stir lubricating oil in the shell to conduct integral lubrication, the primary planetary gear can throw the lubricating oil onto the secondary planetary gear, the lubrication effect is further improved, and the operation reliability is guaranteed.

Meanwhile, lubricating oil can enter the primary oil duct and the secondary oil duct to lubricate bearings between the primary planet wheel and the primary wheel shaft and between the secondary planet wheel and the secondary wheel shaft, so that the lubricating effect is further improved.

The utility model is further illustrated by the following examples in conjunction with the accompanying drawings.

Drawings

FIG. 1 is a cross-sectional view of a deceleration structure according to the present utility model;

FIG. 2 is a perspective view of the primary deceleration of the present utility model;

FIG. 3 is a cross-sectional view of the primary deceleration of the present utility model;

FIG. 4 is a perspective view of a two-stage reduction according to the present utility model;

FIG. 5 is a cross-sectional view of a two-stage reduction according to the present utility model;

FIG. 6 is a perspective view of a secondary first frame according to the present utility model;

Fig. 7 is a perspective view of the secondary second frame according to the present utility model.

In the figure: 100 shells, 200 motors, 210 motor flanges, 300-stage reduction, 310-stage planetary carriers, 311-stage left side plates, 312-stage right side plates, 313-stage outer plates, 313-stage notches, 314-stage wheel shafts, 314 a-stage oil ducts, 314 b-stage holes, 315-stage right pipes, 315a spline grooves, 316-stage bearings, 317-stage left pipes, 320-stage planetary gears, 330-stage gear rings, 340-stage sun gears, 400-stage reduction, 410-stage planetary carriers, 411-stage second-stage first-stage carrier bodies, 411 a-stage second-stage left side plates, 411 b-stage right side plates, 411 c-stage outer plates, 411c 1-stage notches, 411 d-stage wheel shafts, and 411d1 second-stage oil duct, 411d2 second-stage hole, 411e second-stage right tube, 411f second-stage left tube, 411f1 draw-in groove, 411f2 second-stage step, 411g second-stage bearing, 412 second support body, 412a second-stage left tube, 412b second-stage second disk, 412c second-disk snap ring, 420 second planetary gear, 421 second-stage first gear, 422 second-stage second gear, 430 second-stage gear ring, 440 second-stage sun gear, 500 decelerating shaft, 710 first bearing, 720 second bearing, 730 third bearing, 740 fourth bearing, 750 fifth bearing, 811 left oil seal, 812 right oil seal 813 intermediate oil seal.

Detailed Description

The following description is presented to enable one of ordinary skill in the art to make and use the utility model. The preferred embodiments in the following description are by way of example only and other obvious variations will occur to those skilled in the art. The basic principles of the utility model defined in the following description may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the utility model.

As shown in fig. 1, 3 and 5, the speed reducing structure comprises a housing 100, and a primary speed reducer 300 and a secondary speed reducer 400 which are arranged in the housing 100, wherein the primary speed reducer 300 comprises a primary planet 320 and a primary wheel shaft 314, the primary planet 320 is sleeved on the primary wheel shaft 314, the secondary speed reducer 400 comprises a secondary planet 420 and a secondary wheel shaft 411d, and the secondary planet 420 is sleeved on the secondary wheel shaft 411 d;

The primary planet 320 is located at an axial side of the secondary planet 420, a primary oil duct 314a is formed at a side of the primary planet 314 facing the secondary planet 420, the primary oil duct 314a is communicated between the primary planet 320 and the primary planet 314, a secondary oil duct 411d1 is formed at a side of the secondary planet 411d facing the primary planet 320, and the secondary oil duct 411d1 is communicated between the secondary planet 420 and the secondary axle 411 d.

The primary reduction 300 and the secondary reduction 400 are jointly arranged inside the casing 100, namely, the primary planetary gear 320 and the secondary planetary gear 420 are jointly stirred with lubricating oil in the casing 100 to perform integral lubrication, wherein the primary planetary gear 320 can throw the lubricating oil onto the secondary planetary gear 420, so that the lubrication effect is improved, and the operation reliability is ensured. Meanwhile, lubricating oil can enter the primary oil passage 314a and the secondary oil passage 411d1 to lubricate bearings between the primary planet 320 and the primary wheel shaft 314 and between the secondary planet 420 and the secondary wheel shaft 411d, thereby further improving lubrication effect.

As shown in fig. 1 to 3, the first-stage reduction 300 includes:

A primary sun gear 340, wherein the primary sun gear 340 is connected with the motor 200;

The primary planet carrier 310, wherein the primary planet carrier 310 is sleeved outside the primary sun gear 340;

The primary planet 320 is rotatably arranged on the primary planet carrier 310, the primary planet 320 is meshed with the primary sun gear 340, and the primary planet 320 can adopt a helical tooth structure;

A primary gear ring 330, wherein the primary gear ring 330 is wound around the outer periphery of the primary planet carrier 310, and the primary gear ring 330 is meshed with the primary planet gears 320.

The motor shaft of the motor 200 is connected with the reduction shaft 500, the primary sun gear 340 may be integrally or detachably connected to the reduction shaft 500, the primary planet carrier 310 is rotatably disposed on the outer wall of the reduction shaft 500, so that the reduction shaft 500 drives the primary sun gear 340 to rotate, the primary planet gear 320 is meshed between the primary sun gear 340 and the primary ring gear 330, and the primary sun gear 340 and the primary ring gear 330 are both rotated, and the primary planet gear 320 is rotatably disposed on the primary planet carrier 310, so as to drive the primary planet carrier 310 to rotate.

Referring to fig. 1 and 3, the engagement positions of the primary ring gear 330 and the primary planetary gears 320 are opposite to the secondary oil passage 411d1 of the secondary axle 411 d. So that the primary planetary gear 320 throws the lubricating oil directly into the secondary oil passage 411d 1.

As shown in fig. 2 and 3, the primary planet carrier 310 includes a primary left side plate 311, a primary right side plate 312, a primary outer side plate 313 and a primary axle 314, the primary outer side plate 313 is respectively connected to the outer rings of the primary left side plate 311 and the primary right side plate 312, the primary axle 314 is connected between the primary left side plate 311 and the primary right side plate 312, the number of the primary axles 314 may be three, and are arranged in a circumferential interval, each primary axle 314 is respectively sleeved with one primary planet wheel 320, the primary planet wheel 320 is held between the primary left side plate 311 and the primary right side plate 312, and a primary notch 313a is formed in the primary outer side plate 313 so that the primary planet wheel 320 is exposed and meshed with the primary ring gear 330. And a primary bearing 316 may be disposed between the primary axle 314 and the primary planet 320.

Referring to fig. 3, the primary axle 314 may be inserted into the primary left side plate 311 and the primary right side plate 312, and the right end surface of the primary axle 314 may be exposed on the primary right side plate 312, a primary oil passage 314a may be formed in the right end surface of the primary axle 314, and a primary hole 314b may be formed in the inner wall of the primary oil passage 314a, and the lubricating oil may enter the primary oil passage 314a from the right end surface of the primary axle 314, and then lubricate the primary bearing 316 between the primary axle 314 and the primary planet 320 through the primary hole 314b, thereby improving the lubrication performance and ensuring the reliability of operation.

The primary planet carrier 310 further includes a primary right pipe 315, and the primary right pipe 315 is connected to an inner ring of the primary right side plate 312.

As shown in fig. 2, the primary planet carrier 310 further includes a primary left tube 317, the primary left tube 317 is connected to an inner ring of the primary left plate 311, the primary right tube 315 and the primary left tube 317 are penetrated by the reduction shaft 500, a first bearing 710 may be disposed between the reduction shaft 500 and the primary left tube 317, and the first bearing 710 may be a double-row tapered roller bearing, so that the primary planet carrier 310 rotates relative to the reduction shaft 500.

As shown in fig. 1, the primary planet carrier 310 is rotatably disposed inside the secondary planet carrier 410, that is, the right side of the primary planet carrier 310 is connected with the secondary sun gear 440 of the secondary speed reducer 400, and the primary gear ring 330 is fixed on the inner wall of the secondary planet carrier 410, so that the structure is more compact, and meanwhile, the primary gear ring 300 of the primary speed reducer 300 is fixed on the inner wall of the secondary planet carrier 410, so that the service life of the bearing can be prolonged.

As shown in fig. 1, 4 and 5, the two-stage reduction 400 includes:

The left end of the secondary planet carrier 410 is connected with a half shaft, and the right end of the secondary planet carrier 410 is rotatably connected with the motor 200;

a secondary planet 420, wherein the secondary planet 420 is rotatably disposed on the secondary planet carrier 410;

A secondary gear ring 430, wherein the secondary gear ring 430 is wound around the outer periphery of the secondary planet carrier 410 and fixed on the inner wall of the housing 100, and the secondary gear ring 430 is meshed with the secondary planet gears 420;

And a secondary sun gear 440, wherein the secondary sun gear 440 is connected with the right side of the primary planet carrier 310 of the primary speed reduction 300, and the secondary sun gear 440 is meshed with the secondary planet gears 420.

The primary planet carrier 310 drives the secondary sun gear 440 to rotate, and the secondary planet gear 420 is meshed between the secondary sun gear 440 and the secondary gear ring 430, wherein the secondary gear ring 430 is fixed, so that the secondary planet gear 420 rotates under the action of the secondary sun gear 440 and the secondary gear ring 430, so that the left end of the secondary planet carrier 410 performs power output, that is, drives the half shaft to rotate.

A left oil seal 811 is provided between the left end of the secondary planet carrier 410 and the housing 100, the motor 200 is connected with the housing 100, and a right oil seal 812 is provided between the right end of the secondary planet carrier 410 and the motor 200. An intermediate oil seal 813 is provided inside the left end of the secondary planet carrier 410, and the primary reduction gear 300 is located between the intermediate oil seal 813 and the secondary planet gear 420, so that the primary reduction gear 300 and the secondary reduction gear 400 are integrally lubricated in the housing 100.

Referring to fig. 1, a motor flange 210 is disposed at the left side of the motor 200, the motor flange 210 is in a ring shape, the motor flange 210 is connected to the right side of the housing 100, and the secondary gear ring 430 may be fixed to the inner wall of the motor flange 210, for example, by using a spline structure, so that the secondary gear ring 430 is inserted and fixed to the inner wall of the motor flange 210 from the left side of the motor 200.

Referring to fig. 1 and 2, the secondary sun gear 440 may be integrally or detachably connected to the primary right pipe 315 of the primary planet carrier 310. For example, the outer wall of the primary right pipe 315 may be provided with spline grooves 315a, the secondary sun gear 440 is inserted into the primary right pipe 315 from right to left by using the spline grooves 315a, and is finally fixed by bolts.

As shown in fig. 1, 6 and 7, the secondary planet carrier 410 includes:

The second-stage first frame 411, the second-stage planetary gears 420 are rotatably arranged on the second-stage first frame 411;

the second stage second frame 412, the left side of the second stage second frame 412 is connected with a half shaft, the right side of the second stage second frame 412 is connected with the second stage first frame 411, and the first stage gear ring 330 is axially limited between the second stage first frame 411 and the second stage second frame 412.

As shown in fig. 4 to 6, the second first frame 411 includes a second left side plate 411a, a second right side plate 411b, a second outer side plate 411c and a second axle 411d, the second outer side plate 411c is respectively connected to outer rings of the second left side plate 411a and the second right side plate 411b, the second axle 411d is connected between the second left side plate 411a and the second right side plate 411b, the number of the second axles 411d may be three, and the second axles 411d are arranged at intervals circumferentially, each second axle 411d is respectively sleeved with one second planet wheel 420, a second bearing 411g is disposed between the second axle 411d and the second planet wheel 420, the second planet wheel 420 is kept between the second left side plate 411a and the second right side plate 411b, and a second notch 411c1 is formed in the second outer side plate 411c for exposing the second planet wheel 420 to mesh with the second ring gear 430.

Referring to fig. 5, the secondary axle 411d is inserted into the secondary left side plate 411a and the secondary right side plate 411b, and the right end surface of the secondary axle 411d is exposed on the secondary right side plate 411b, at this time, a secondary oil passage 411d1 may be formed in the right end surface of the secondary axle 411d, and a secondary hole 411d2 may be formed in the inner wall of the secondary oil passage 411d1, and lubricating oil may enter the secondary oil passage 411d1 from the right end surface of the secondary axle 411d, and then lubricate the secondary bearing 411g between the secondary axle 411d and the secondary planet wheel 420 through the secondary hole 411d 2.

As shown in fig. 1, 5 and 6, the second-stage first frame 411 further includes a second-stage right tube 411e, the second-stage right tube 411e is connected with an inner ring of the second-stage right side plate 411b, the second-stage right tube 411e is inserted into a housing of the motor 200, and a second bearing 720 is disposed between the second-stage right tube 411e and the housing of the motor 200. Meanwhile, the second-stage right tube 411e is sleeved outside the reduction shaft 500, and a third bearing 730 can be arranged between the second-stage right tube and the reduction shaft, so that the reliability of the structure is improved, and meanwhile, the stability of rotation is ensured.

As shown in fig. 1 and 6, the second stage first frame 411 further includes a second stage left tube 411f, the second stage left tube 411f is connected with an outer ring of the second stage left plate 411a, and the first stage speed reducer 300 may be accommodated in the second stage left tube 411f, so that the structure is more compact. The primary right pipe 315 of the primary planet carrier 310 passes through the inner ring of the secondary left side plate 411a and goes deep into the secondary outer side plate 411c, and the secondary sun gear 440 is sleeved on the primary right pipe 315 to mesh with the secondary planet gears 420. And a fourth bearing 740 is provided between the primary right pipe 315 and the secondary left side plate 411 a.

As shown in fig. 1, 4 and 5, the secondary planet gear 420 is a double-wheel gear, and includes a secondary first gear 421 and a secondary second gear 422, the secondary first gear 421 and the secondary second gear 422 are axially and integrally connected, the secondary first gear 421 is meshed with the secondary sun gear 440, and the secondary second gear 422 is meshed with the secondary ring gear 430.

The second first gear 421 and the second gear 422 are arranged from left to right, the circumferential dimension of the second first gear 421 is larger than the circumferential dimension of the second gear 422, and the second first gear 421 and the second gear 422 may have a helical gear structure.

As shown in fig. 1, 6 and 7, the second frame 412 includes a second left pipe 412a and a second disk 412b, the second left pipe 412a is connected to an inner ring of the second disk 412b, and the second disk 412b is connected to a left side of the second left pipe 411f and may be fixed by bolts or the like. The secondary second left tube 412a may extend from the left side of the housing 100 or may be disposed inside the housing 100 as a power output and connected to a half shaft. Referring to fig. 1, a fifth bearing 750 may be disposed between the second-stage second left pipe 412a and the housing 100, and the fifth bearing 750 may be a double-row tapered roller bearing.

As shown in fig. 1, 4 and 7, a second-stage step 411f2 is disposed on the inner wall of the second-stage left tube 411f, a slot 411f1 is further disposed on the inner wall of the second-stage left tube 411f, and the slot 411f1 extends from the second-stage step 411f2 to the left end face of the second-stage left tube 411 f. The right end face of the second-stage second disk 412b is provided with a second disk snap ring 412c, wherein the outer diameter of the second-stage second disk 412b is larger than that of the second disk snap ring 412c, the outer ring of the first-stage gear ring 330 is provided with a gear ring snap ring, the gear ring snap ring is adapted to the clamping slot 411f1, so that the first-stage gear ring 330 is inserted from the left end face of the second-stage left pipe 411f and is arranged inside the second-stage left pipe 411f, and then the second disk snap ring 412c is inserted into the clamping slot 411f1 until the second disk snap ring 412c abuts against the left end face of the second-stage left pipe 411f, so that the first-stage gear ring 330 is axially limited between the second disk snap ring 412c and the second-stage step 411f 2. The secondary planet carrier 410 is seen to be a split structure to facilitate the overall assembly.

The housing 100 may be configured as a support arm, that is, the primary reduction 300 and the secondary reduction 400 are disposed in the support arm, and the primary reduction 300, the secondary reduction 400, and the motor 200 are axially arranged according to the respective circumferential dimensions, the primary reduction 300 with the smaller circumferential dimension is disposed at the outside, the secondary reduction 400 with the larger circumferential dimension is disposed between the motor 200 and the primary reduction 300, so that the circumferential dimension is prevented from becoming larger, interference with an airbag or the like disposed at the edge of the outline of the support arm is prevented, the arrangement is novel, the mechanism space is fully utilized, and the occupied space is further reduced.

As shown in fig. 1, the motor 200 is an axial flux motor, which has advantages of small axial dimension, high efficiency, high power density, etc., so that the overall axial dimension is further reduced by adopting the axial flux motor.

Referring to fig. 1, the operation principle of the deceleration structure is as follows:

The motor 200 drives the reduction shaft 500 to rotate, the reduction shaft 500 drives the primary sun gear 340 to rotate, and the primary planet gear 320 is meshed between the primary sun gear 340 and the primary gear ring 330, and the primary sun gear 340 and the primary gear ring 330 both rotate, and the primary planet gear 320 is rotatably disposed on the primary planet carrier 310, so that the primary planet carrier 310 rotates under the action of the primary sun gear 340 and the primary gear ring 330;

The primary planet carrier 310 drives the secondary sun gear 440 to rotate, and the secondary planet gear 420 rotates under the action of the secondary sun gear 440 and the secondary ring gear 430 because the secondary planet gear 420 is meshed between the secondary sun gear 440 and the secondary ring gear 430, and the secondary ring gear 430 is fixed, so that the left end of the secondary planet carrier 410 drives the half shaft to rotate.

The above-described embodiments are only for illustrating the technical spirit and features of the present utility model, and it is intended to enable those skilled in the art to understand the content of the present utility model and to implement it accordingly, and the scope of the present utility model as defined by the present embodiments should not be limited only by the present embodiments, i.e. equivalent changes or modifications made in accordance with the spirit of the present utility model will still fall within the scope of the present utility model.

Claims (10)

1. The speed reduction structure is characterized by comprising a shell (100), and a primary speed reduction (300) and a secondary speed reduction (400) which are arranged in the shell (100), wherein the primary speed reduction (300) comprises a primary planet wheel (320) and a primary wheel shaft (314), the primary planet wheel (320) is sleeved on the primary wheel shaft (314), the secondary speed reduction (400) comprises a secondary planet wheel (420) and a secondary wheel shaft (411 d), and the secondary planet wheel (420) is sleeved on the secondary wheel shaft (411 d);

The primary planet wheel (320) is located on the axial side of the secondary planet wheel (420), a primary oil duct (314 a) is formed in one side of the primary wheel shaft (314) towards the secondary planet wheel (420), the primary oil duct (314 a) is communicated between the primary planet wheel (320) and the primary wheel shaft (314), a secondary oil duct (411 d 1) is formed in one side of the secondary wheel shaft (411 d) towards the primary planet wheel (320), and the secondary oil duct (411 d 1) is communicated between the secondary planet wheel (420) and the secondary wheel shaft (411 d).

2. The reduction structure according to claim 1, wherein the primary reduction (300) includes a primary ring gear (330), the primary ring gear (330) being wound around the outside of the primary planetary gear (320), the primary ring gear (330) being engaged with the primary planetary gear (320), the engagement position of the primary ring gear (330) and the primary planetary gear (320) being opposite to a secondary oil passage (411 d 1) of the secondary wheel shaft (411 d).

3. The reduction structure according to claim 1, wherein the secondary reduction structure (400) further comprises a secondary planet carrier (410), a left end of the secondary planet carrier (410) is connected with a half shaft, a right end of the secondary planet carrier (410) is connected with the motor (200), a left oil seal (811) is provided between the left end of the secondary planet carrier (410) and the housing (100), the motor (200) is connected with the housing (100), and a right oil seal (812) is provided between the right end of the secondary planet carrier (410) and the motor (200).

4. A reduction structure according to claim 3, wherein the primary planet carrier (310) is rotatably arranged inside the secondary planet carrier (410), and the primary planet (320) is arranged on the primary planet carrier (310) via the primary axle (314).

5. The reduction structure according to claim 4, wherein an intermediate oil seal (813) is provided inside the left end of the secondary planet carrier (410), and the primary reduction (300) is located between the intermediate oil seal (813) and the secondary planet (420).

6. The reduction structure according to claim 4, wherein the secondary planet carrier (410) includes a secondary second carrier (412) and a secondary first carrier (411) disposed from left to right, the secondary planet wheel (420) is connected to the secondary first carrier (411) through the secondary axle (411 d), and the primary ring gear (330) of the primary reduction (300) is fixed between the secondary second carrier (412) and the secondary first carrier (411).

7. The reduction structure according to claim 4, characterized in that the two-stage reduction (400) further includes:

A secondary gear ring (430), wherein the secondary gear ring (430) is wound outside the secondary planet wheel (420), the secondary gear ring (430) is meshed with the secondary planet wheel (420), and the secondary gear ring (430) is fixed on the inner wall of the shell (100);

And the secondary sun gear (440), the secondary sun gear (440) is fixed on the primary planet carrier (310) of the primary speed reduction (300), and the secondary sun gear (440) is meshed with the secondary planet gears (420).

8. The reduction structure according to claim 7, wherein the secondary planetary gear (420) includes a secondary first gear (421) and a secondary second gear (422), the secondary first gear (421) and the secondary second gear (422) are connected in an axial direction and integrally, the secondary first gear (421) is meshed with the secondary sun gear (440), the secondary second gear (422) is meshed with the secondary ring gear (430), and a diameter of the secondary first gear (421) is larger than a diameter of the secondary second gear (422).

9. A speed reducing structure as defined in claim 3, wherein the motor is an axial flux motor.

10. A reduction structure according to claim 3, wherein a motor shaft of the motor is connected with a reduction shaft (500), the reduction shaft (500) sequentially penetrates through the primary reduction and the secondary reduction, a primary sun gear (340) is arranged on the reduction shaft (500), and the primary sun gear (340) is meshed with the primary planet gear (320).