Two-stage hub reduction gear and drive axle

Abstract

The invention relates to the technical field of automobile axles, in particular to a two-stage hub reduction gear which comprises a reduction gear shell and a planetary reduction mechanism, and the planetary reduction mechanism comprises a first gear ring, a second gear ring, a planet carrier assembly, a sun gear, a first planet gear and a second planet gear. The first gear ring is fixedly arranged on the speed reducer shell and coaxially arranged with the speed reducer shell, the sun gear, the first planet gear and the second planet gear are rotationally arranged on the planet carrier assembly, the sun gear and the second gear ring are coaxially arranged and used for being in transmission connection with a half shaft of a drive axle, and the first planet gear is meshed with the sun gear and inner teeth of the second gear ring. And the second planet gear is meshed with outer teeth of the first gear ring and outer teeth of the second gear ring, and the working condition requirements of low speed ratio and high torque of a vehicle are met by arranging the two-stage speed reduction mechanism. The invention provides the drive axle which is provided with the two-stage hub reduction gear, so that the power of a vehicle is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile axles, and in particular to a double-stage wheel-side reducer and a drive axle. Background Art

[0002] Mining dump trucks are off-road dump trucks and have important application scenarios and roles in the transportation of materials inside mines. Since mining dump trucks are mostly used in off-road conditions, the road slope is large, and their load mass is large, the required transmission torque is large to provide strong power. Existing mining dump trucks use wheel-side reduction drive axles, and the wheel-side reducers of the drive axle use a single-stage reduction structure. The reduction ratio of this structure is relatively small and cannot meet the low speed ratio and high torque working conditions of mining dump trucks, resulting in insufficient output power of mining dump trucks and low working efficiency.

[0003] Therefore, a two-stage wheel reducer is urgently needed. Summary of the invention

[0004] The object of the present invention is to provide a two-stage wheel reducer to meet the working requirements of low speed ratio and high torque of a mining dump truck.

[0005] Another object of the present invention is to provide a drive axle that increases the power of the vehicle by providing the above-mentioned two-stage wheel-side reducer.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] Two-stage wheel reducer, including:

[0008] Reducer housing;

[0009] A planetary reduction mechanism, the planetary reduction mechanism includes a first ring gear, a second ring gear, a planet carrier assembly, a sun gear, a first planetary gear and a second planetary gear, the first ring gear is fixed on the reducer housing and is coaxially arranged with the reducer housing, the first ring gear is sleeved on the second ring gear and is coaxially arranged with the second ring gear, the second ring gear has internal teeth and external teeth, the sun gear, the first planetary gear and the second planetary gear are rotatably arranged on the planet carrier assembly, the planet carrier assembly is used to be fixedly connected to the shaft sleeve of the drive axle, the sun gear is coaxially arranged with the second ring gear and is used to be connected to the half shaft of the drive axle, the first planetary gear is respectively meshed with the internal teeth of the sun gear and the second ring gear, and the second planetary gear is respectively meshed with the external teeth of the first ring gear and the second ring gear.

[0010] As a preferred technical solution for a two-stage wheel-side reducer, the two-stage wheel-side reducer also includes a half-shaft gear sleeve, which is provided with a through hole, and the rotating shaft of the sun gear is inserted at one end of the through hole so that the rotating shaft of the sun gear and the half-shaft gear sleeve are axially engaged with each other around the through hole, and one end of the half shaft is inserted at the other end of the through hole so that the half shaft and the half-shaft gear sleeve are axially engaged with each other around the through hole.

[0011] As a preferred technical solution for the two-stage wheel-side reducer, the rotating shaft of the sun gear is provided with a first through hole, one end of the half shaft is provided with a first threaded hole corresponding to the first through hole, and a first bolt passes through the first through hole and is threadedly connected to the first threaded hole.

[0012] As an optimal technical solution for a two-stage wheel-side reducer, the planetary carrier assembly includes a planetary carrier, a first planetary gear shaft and a second planetary gear shaft, the first planetary gear shaft and the second planetary gear shaft are both fixedly arranged on the planetary carrier, the sun gear is rotatably arranged on the planetary carrier, the first planetary gear is rotatably sleeved on the first planetary gear shaft, and the second planetary gear is rotatably sleeved on the second planetary gear shaft.

[0013] As an optimal technical solution for a two-stage wheel-side reducer, the planetary carrier includes a planetary carrier bracket, a first planetary carrier and a second planetary carrier, the first planetary carrier is connected to the planetary carrier bracket, the planetary carrier bracket is fixedly connected to the shaft sleeve, the first planetary carrier and the second planetary carrier are arranged at intervals, the two ends of the first planetary wheel shaft are respectively arranged on the first planetary carrier and the second planetary carrier, the two ends of the second planetary wheel shaft are respectively arranged on the first planetary carrier and the second planetary carrier, and the first planetary wheel, the second planetary wheel and the sun gear are all located between the first planetary carrier and the second planetary carrier.

[0014] As a preferred technical solution for the two-stage wheel-side reducer, a baffle is fixedly provided at one end of the rotating shaft of the sun gear away from the half-shaft, and a clamping portion is provided on the second planetary carrier. The baffle is clamped to the clamping portion to limit the baffle from moving axially along the sun gear relative to the second planetary carrier.

[0015] As a preferred technical solution for a two-stage wheel-side reducer, a plurality of second through holes are circumferentially arranged on the first ring gear, a plurality of second threaded holes corresponding to the plurality of second through holes are circumferentially arranged on the reducer housing, and a plurality of second bolts pass through the plurality of second through holes one by one and are threadedly connected to the plurality of second threaded holes one by one.

[0016] The drive axle comprises a bridge housing, a shaft sleeve, a half shaft and a two-stage wheel-side reducer as described in any of the above schemes, one end of the shaft sleeve is fixedly connected to the bridge housing, the other end of the shaft sleeve is fixedly connected to the planetary carrier bracket, and the half shaft passes through the bridge housing and the shaft sleeve in sequence and is connected to the sun gear transmission.

[0017] As a preferred technical solution of the drive axle, the drive axle further comprises a wheel hub and a wheel hub bearing, wherein the wheel hub is sleeved on the shaft sleeve and is rotationally matched with the shaft sleeve through the wheel hub bearing;

[0018] One end of the reducer housing is coaxially fixed to the first gear ring, and the other end of the reducer housing is coaxially fixed to the wheel hub.

[0019] As an optimal technical solution for the drive axle, the drive axle also includes a wheel hub oil seal, which is arranged on the shaft sleeve and on the side of the wheel hub bearing away from the two-stage wheel-side reducer. The wheel hub oil seal is located between the wheel hub and the shaft sleeve and is respectively pressed against the wheel hub and the shaft sleeve.

[0020] Beneficial effects of the present invention:

[0021] The present invention provides a two-stage wheel-side reducer, which includes a reducer housing and a planetary reduction mechanism, wherein the planetary reduction mechanism includes a first ring gear, a second ring gear, a planetary carrier assembly, a sun gear, a first planetary gear and a second planetary gear. The first ring gear is fixed to the reducer housing and is coaxially arranged with the reducer housing, the first ring gear is sleeved on the second ring gear and is coaxially arranged with the second ring gear, the second ring gear has internal teeth and external teeth, the sun gear, the first planetary gear and the second planetary gear are rotatably arranged on the planetary carrier assembly, the planetary carrier assembly is used to be fixedly connected to the shaft sleeve of the drive axle, the sun gear is coaxially arranged with the second ring gear and is used to be connected to the half-axle of the drive axle, the first planetary gear is respectively meshed with the internal teeth of the sun gear and the second ring gear, and the second planetary gear is respectively meshed with the external teeth of the first ring gear and the second ring gear. The sun gear is input, the second ring gear is output, and the planetary carrier assembly is fixed as a primary reduction transmission chain. The second ring gear integrates the sun gear for secondary reduction, the first ring gear is output, and the planetary carrier assembly is fixed as a secondary reduction transmission chain. The two-stage wheel-side reducer achieves a high reduction ratio by setting a two-stage reduction mechanism, meeting the vehicle's low speed ratio and high torque operating requirements.

[0022] The present invention provides a driving axle, which increases the power of the vehicle and improves the working efficiency by arranging the above-mentioned two-stage wheel-side reducer. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a cross-sectional view of a drive axle provided by an embodiment of the present invention;

[0024] Figure 2is a cross-sectional view of a two-stage wheel reducer provided in an embodiment of the present invention;

[0025] Figure 3 It is an exploded view of the double-stage wheel-side double-stage wheel-side reducer of the present invention.

[0026] In the figure:

[0027] 20, half shaft; 201, bushing; 30, bridge housing; 40, wheel hub; 401, wheel hub bearing; 4011, first wheel hub bearing; 4012, second wheel hub bearing; 402, wheel hub oil seal; 403, oil seal seat ring; 50, brake drum; 60, nut; 70, tire bolt; 80, wheel nut; 90, wheel assembly;

[0028] 1. Reducer housing;

[0029] 2. Planetary reduction mechanism; 211. First ring gear; 212. Second ring gear; 221. Planet carrier; 2211. Planet carrier bracket; 2212. First planet carrier; 2213. Second planet carrier; 222. First planetary gear shaft; 223. Second planetary gear shaft; 23. Sun gear; 24. First planetary gear; 241. First planetary gear gasket; 25. Second planetary gear; 251. Second planetary gear gasket;

[0030] 3. End cover; 4. Axle shaft gear sleeve; 5. First bolt; 6. Second bolt; 7. Third bolt; 8. Baffle; 9. Snap ring; 10. Gasket; 11. First needle roller bearing; 12. Second needle roller bearing. DETAILED DESCRIPTION

[0031] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0032] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0034] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0035] Combine the following Figure 1-Figure 3 The technical solution of the present invention is described in detail through specific implementation methods.

[0036] In the operation of a mining dump truck, in order to meet the working requirements of low speed ratio and high torque of the wheels, thereby improving the output power of the mining dump truck and improving the working efficiency, the present invention provides a two-stage wheel reducer. The two-stage wheel-side reducer includes a reducer housing 1 and a planetary reduction mechanism 2, wherein the planetary reduction mechanism 2 includes a first ring gear 211, a second ring gear 212, a planetary carrier assembly, a sun gear 23, a first planetary gear 24 and a second planetary gear 25. The first ring gear 211 is fixed to the reducer housing 1 and is coaxially arranged with the reducer housing 1. The first ring gear 211 is sleeved on the second ring gear 212 and is coaxially arranged with the second ring gear 212. The second ring gear 212 has internal teeth and external teeth. The sun gear 23, the first planetary gear 24 and the second planetary gear 25 are rotatably arranged on the planetary carrier assembly. The planetary carrier assembly is used to be fixedly connected to the shaft sleeve 201 of the drive axle. The sun gear 23 is coaxially arranged with the second ring gear 212 and is used to be connected to the half shaft 20 of the drive axle. The first planetary gear 24 is respectively meshed with the internal teeth of the sun gear 23 and the second ring gear 212, and the second planetary gear 25 is respectively meshed with the external teeth of the first ring gear 211 and the second ring gear 212.

[0037] Specifically, the power is input into the planetary reduction mechanism 2 through the half shaft 20, the half shaft 20 drives the sun gear 23 to rotate, the sun gear 23 drives the first planetary gear 24 to rotate, the first planetary gear 24 drives the second ring gear 212 to rotate, the second ring gear 212 drives the second planetary gear 25 to rotate, the second planetary gear 25 drives the first ring gear 211 to rotate, the first ring gear 211 transmits the power to the reducer housing 1, and the reducer housing 1 transmits the power to the wheel to drive the wheel. This type of wheel-side reducer adopts a two-stage reduction mechanism, namely, the first stage reduction: the sun gear 23 inputs, the second ring gear 212 outputs, and the planetary carrier assembly is fixed; the second stage reduction: the second ring gear 212 integrates the sun gear 23 of the second stage reduction, the first ring gear 211 outputs, and the planetary carrier assembly is fixed. By setting the first and second stage reduction mechanisms, a high reduction ratio can be achieved, thereby improving the power of the vehicle.

[0038] Furthermore, there are at least two first planetary gears 24, at least two of which are meshed with the sun gear 23 along the circumference of the sun gear 23 and with the internal teeth of the second ring gear 212 along the circumference of the second ring gear 212. There are at least two second planetary gears 25, at least two of which are meshed with the external teeth of the second ring gear 212 along the circumference of the second ring gear 212 and with the first ring gear 211 along the circumference of the first ring gear 211. In this embodiment, according to the inner diameter of the sun gear 23, as many first planetary gears 24 as possible are arranged between the sun gear 23 and the second ring gear 212, and the preferred number is 4. According to the inner diameter of the second ring gear 212, as many second planetary gears 25 as possible are arranged between the first ring gear 211 and the second ring gear 212, and the preferred number is 8. The purpose of the above arrangement is to increase the torque transmission capacity between the sun gear 23 and the second ring gear 212, as well as the torque transmission capacity between the first ring gear 211 and the second ring gear 212, thereby improving the overall torque transmission capacity of the two-stage wheel-side reducer.

[0039] like Figure 2 As shown, the sun gear 23 is connected with the half shaft 20 through the half shaft gear sleeve 4, and the half shaft gear sleeve 4 is provided with a through hole, the rotating shaft of the sun gear 23 is inserted at one end of the through hole, the rotating shaft of the sun gear 23 is engaged with the half shaft gear sleeve 4 around the axial direction of the through hole, the half shaft 20 is inserted at the other end of the through hole, and the half shaft 20 is engaged with the half shaft gear sleeve 4 around the axial direction of the through hole, so that the sun gear 23 rotates with the half shaft 20, and the speed and torque transmitted from the half shaft 20 are transmitted, and the half shaft gear sleeve 4 is used to drive the sun gear 23 and the half shaft 20, which can adapt to the situation where the size of the sun gear 23 is small. Optionally, in this embodiment, the through hole on the half shaft gear sleeve 4 is a spline hole, the rotating shaft of the sun gear 23 is inserted at one end of the spline hole and matched with the spline hole wall, and the spline shaft on the half shaft 20 is inserted at the other end of the spline hole and matched with the spline hole wall.

[0040] The rotating shaft of the sun gear 23 is provided with a first through hole, and one end of the half shaft 20 is provided with a first threaded hole corresponding to the first through hole. The first bolt 5 passes through the first through hole and is screwed with the first threaded hole, thereby fixing the axial position of the sun gear 23 and the half shaft 20, preventing the rotating shaft of the sun gear 23 and the half shaft 20 from escaping from the spline hole, thereby enabling the half shaft 20 to achieve stable power transmission.

[0041] In this embodiment, the planetary carrier assembly includes a planetary carrier 221, a first planetary gear shaft 222 and a second planetary gear shaft 223, the first planetary gear shaft 222 and the second planetary gear shaft 223 are both fixedly arranged on the planetary carrier 221, the sun gear 23 is rotatably arranged on the planetary carrier 221, the first planetary gear 24 is rotatably sleeved on the first planetary gear shaft 222, and the second planetary gear 25 is rotatably sleeved on the second planetary gear shaft 223. Through the above arrangement, support is provided for the rotation of the sun gear 23, the first planetary gear 24 and the second planetary gear 25, and the stability of power transmission is ensured. In order to ensure the smoothness of the rotation of the first planetary gear 24 and the second planetary gear 25, a first needle bearing 11 is embedded between the inner hole of the first planetary gear 24 and the first planetary gear shaft 222, and a second needle bearing 12 is embedded between the inner hole of the second planetary gear 25 and the second planetary gear shaft 223. The first needle bearing 11 and the second needle bearing 12 can respectively effectively support the rotation of the first planetary gear 24 and the second planetary gear 25.

[0042] Furthermore, in order to improve the stability of the planetary carrier 221 structure, the planetary carrier 221 includes a planetary carrier bracket 2211, a first planetary carrier 2212 and a second planetary carrier 2213, the first planetary carrier 2212 is connected to the planetary carrier bracket 2211, the planetary carrier bracket 2211 is fixedly connected to the shaft sleeve 201, the first planetary carrier 2212 and the second planetary carrier 2213 are arranged at intervals, the two ends of the first planetary gear shaft 222 are respectively arranged on the first planetary carrier 2212 and the second planetary carrier 2213, the two ends of the second planetary gear shaft 223 are respectively arranged on the first planetary carrier 2212 and the second planetary carrier 2213, and the first planetary gear 24, the second planetary gear 25 and the sun gear 23 are all located between the first planetary carrier 2212 and the second planetary carrier 2213.

[0043] In detail, the inner stopper of the planet carrier bracket 2211 is matched with the outer stopper of the first planet carrier 2212, the first planet carrier 2212 is provided with a plurality of first circular holes along the circumferential direction, the planet carrier bracket 2211 is provided with third threaded holes corresponding to the plurality of first circular holes, a plurality of third bolts 7 pass through the plurality of first circular holes one by one and are screwed with the plurality of third threaded holes one by one, so as to fix the first planet carrier 2212 with the planet carrier bracket 2211. The first planet carrier 2212 and the second planet carrier 2213 are respectively provided with second circular holes corresponding to the axial diameter of the first planetary gear shaft 222, and the two ends of the first planetary gear shaft 222 are passed through the second circular holes on the first planet carrier 2212 and the second planet carrier 2213, so as to be fixedly connected with the first planet carrier 2212 and the second planet carrier 2213. The first planet carrier 2212 and the second planet carrier 2213 are respectively provided with third circular holes corresponding to the axial diameter of the second planetary gear shaft 223, and both ends of the second planetary gear shaft 223 are passed through the third circular holes on the first planet carrier 2212 and the second planet carrier 2213 to be fixedly connected with the first planet carrier 2212 and the second planet carrier 2213. By fixing the first planet carrier 2212 and the second planet carrier 2213, and fixing the first planet carrier 2212 and the planet carrier bracket 2211, the structural strength of the planet carrier assembly is ensured.

[0044] Furthermore, the first planetary carrier 2212 and the second planetary carrier 2213 are respectively provided with fourth circular holes corresponding to the shaft diameter of the sun gear 23 , the rotating shaft of the sun gear 23 is passed through the fourth circular hole, and the sun gear 23 is meshed with the first planetary gear 24 , thereby transmitting power to the first planetary gear 24 .

[0045] Further, a baffle 8 is fixedly provided at one end of the rotating shaft of the sun gear 23 away from the half shaft 20, and a third through hole corresponding to the first through hole is provided on the baffle 8. The first bolt 5 passes through the first through hole and the third through hole and is screwed with the first threaded hole, so that the baffle 8 is fixedly provided at one end of the sun gear 23. A clamping portion is provided on the second planetary carrier 2213, and the baffle 8 is clamped on the clamping portion, which limits the axial movement of the sun gear 23 and improves the stability of the axial position installation of the sun gear 23. Optionally, in this embodiment, two annular grooves are provided on the inner wall of the fourth circular hole on the second planetary carrier 2213 at intervals, and two snap rings 9 are embedded in the two annular grooves in a one-to-one correspondence. The baffle 8 is located between the two snap rings 9, and a gasket 10 is provided between the end face of the snap ring 9 and the end face of the baffle 8. The baffle 8 is limited by the snap ring 9 through the annular groove, so as to further limit the axial movement of the sun gear 23.

[0046] A first planetary wheel gasket 241 is respectively arranged between the first planetary wheel 24 and the first planetary carrier 2212 and the second planetary carrier 2213, and the rotating shaft of the first planetary wheel 24 is passed through the inner hole of the first planetary wheel gasket 241. A second planetary wheel gasket 251 is respectively arranged between the second planetary wheel 25 and the first planetary carrier 2212 and the second planetary carrier 2213, and the rotating shaft of the second planetary wheel 25 is passed through the inner hole of the second planetary wheel gasket 251. This arrangement avoids the wear between the end faces of the first planetary wheel 24 and the second planetary wheel 25 and the first planetary carrier 2212 and the second planetary carrier 2213 caused by the first planetary wheel 24 moving on the first planetary wheel shaft 222 and the second planetary wheel 25 moving on the second planetary wheel shaft 223, thereby eliminating the noise problem generated under high-speed operation.

[0047] Optionally, the first planetary gear shaft 222 is welded to the first planetary frame 2212 and the second planetary frame 2213, respectively, and the two ends of the first planetary gear shaft 222 are welded at the second circular holes on the first planetary frame 2212 and the second planetary frame 2213 by annular welds. The second planetary gear shaft 223 is welded to the first planetary frame 2212 and the second planetary frame 2213, respectively, and the two ends of the second planetary gear shaft 223 are welded at the third circular holes on the first planetary frame 2212 and the second planetary frame 2213 by annular welds, respectively, which is simple to operate and further improves the structural strength of the planetary frame 221 assembly.

[0048] Furthermore, the two-stage wheel-side reducer also includes an end cover 3, which is buckled on the outer side of the second planetary carrier 2213 and connected to the reducer housing 1, so as to play a role of dustproof and sealing. The concave stopper of the first gear ring 211 is matched and connected with the convex stopper on the reducer housing 1, the first gear ring 211 is provided with a plurality of second through holes along the circumferential direction, and the corresponding end cover 3 is provided with a plurality of connecting holes along the circumferential direction, and the reducer housing 1 is provided with a plurality of second threaded holes corresponding to the plurality of second through holes along the circumferential direction, and the plurality of second bolts 6 pass through the plurality of connecting holes and the plurality of second through holes on the end cover 3 one by one and are screwed with the second threaded holes one by one, so that the first gear ring 211 can drive the reducer housing 1 to rotate, and the reducer housing 1 then transmits power to the wheels to realize the driving of the wheels.

[0049] The embodiment of the present invention further provides a drive axle, which includes a bridge housing 30, a sleeve 201, a half shaft 20 and a two-stage wheel-side reducer, one end of the sleeve 201 is fixedly connected to the bridge housing 30, the other end of the sleeve 201 is fixedly connected to the planetary carrier bracket 2211, and the half shaft 20 passes through the bridge housing 30 and the sleeve 201 in sequence and is drivingly connected to the sun gear 23. The half shaft 20 transmits power to the two-stage wheel-side reducer through the sun gear 23, and the two-stage wheel-side reducer then transmits power to the wheels, thereby realizing the driving of the wheels, meeting the high torque and large load working condition requirements of the vehicle. Specifically, one end of the sleeve 201 is fixedly connected to the bridge housing 30 by bolts, the other end of the sleeve 201 is provided with a spline, the planetary carrier bracket 2211 is provided with a spline hole, and the spline shaft of the sleeve 201 is inserted into the spline hole on the planetary carrier bracket 2211, so that the spline shaft of the sleeve 201 and the planetary carrier bracket 2211 are axially clamped around the spline hole on the planetary carrier bracket 2211. Furthermore, the end of the sleeve 201 fixed to the planetary carrier bracket 2211 is provided with an external thread, and the nut 60 is matched with the external thread on the sleeve 201, which limits the movement of the planetary carrier bracket 2211 along the axis direction of the sleeve 201, thereby increasing the stability of the double-stage wheel-side reducer structure.

[0050] Furthermore, the drive axle also includes a wheel hub 40 and a wheel hub bearing 401. The wheel hub 40 is sleeved on the shaft sleeve 201 and rotates with the shaft sleeve 201 through the wheel hub bearing 401. One end of the reducer housing 1 is coaxially fixed to the first gear ring 211, and the other end of the reducer housing 1 is coaxially fixed to the wheel hub 40. The reducer housing 1 transmits power to the wheel hub 40. This arrangement ensures the stability of the double-stage wheel-side reducer architecture. Optionally, the wheel hub bearing 401 includes a first wheel hub bearing 4011 and a second wheel hub bearing 4012. The first wheel hub bearing 4011 and the second wheel hub bearing 4012 are sleeved on the shaft sleeve 201 at intervals to provide more precise guidance for the rotation of the wheel hub 40.

[0051] Further, the drive axle further comprises a hub oil seal 402, which is sleeved on the shaft sleeve 201 and located on the side of the hub bearing 401 away from the two-stage wheel-side reducer, and is located between the hub 40 and the shaft sleeve 201 and is respectively pressed against the hub 40 and the shaft sleeve 201, and the hub oil seal 402 can prevent the leakage or seepage of lubricating oil, and can prevent dust from entering the inside of the hub 40, thereby ensuring a good lubrication condition of the hub bearing 401. In this embodiment, the hub oil seal 402 is located on the side of the second hub bearing 4012 away from the first hub bearing 4011. In this embodiment, the drive axle further comprises an oil seal seat ring 403, which is located between the hub oil seal 402 and the shaft sleeve 201, and is sleeved on the outside of the oil seal seat ring 403 and is coaxially arranged with the hub oil seal 402, which further prevents the leakage of lubricating oil in the cavity where the planetary assembly and the hub 40 are located.

[0052] Furthermore, the drive axle also includes a brake drum 50 and a wheel assembly 90, which are arranged on the outside of the wheel hub 40 and coaxially arranged with the reducer housing 1. The reducer housing 1, the brake drum 50 and the wheel assembly 90 are fixedly connected through tire bolts 70 and wheel nuts 80, so that the brake drum 50 brakes the vehicle and the wheel assembly 90 bears the weight of the vehicle to ensure stable driving of the vehicle.

[0053] It should be noted that other structures of the drive axle belong to the prior art and will not be described in detail here.

[0054] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. Two-stage wheel reducer, characterized in that: include: Reducer housing (1); A planetary reduction mechanism (2), the planetary reduction mechanism (2) comprising a first gear ring (211), a second gear ring (212), a planet carrier assembly, a sun gear (23), a first planetary gear (24) and a second planetary gear (25), the first gear ring (211) being fixedly mounted on the reducer housing (1) and being coaxially arranged with the reducer housing (1), the first gear ring (211) being sleeved on the second gear ring (212) and being coaxially arranged with the second gear ring (212), the second gear ring (212) having internal teeth and external teeth, the sun gear (23), the first planetary gear (24) and the second planetary gear (25 ...) being sleeved on the second planetary gear (212) and being coaxially arranged with the The first planetary gear (24) and the second planetary gear (25) are rotatably arranged on the planetary carrier assembly, and the planetary carrier assembly is used to be fixedly connected to the shaft sleeve (201) of the drive axle. The sun gear (23) and the second gear ring (212) are coaxially arranged and used to be drivingly connected to the half shaft (20) of the drive axle. The first planetary gear (24) is respectively meshed with the internal teeth of the sun gear (23) and the second gear ring (212), and the second planetary gear (25) is respectively meshed with the external teeth of the first gear ring (211) and the second gear ring (212).

2. The double-stage wheel reducer according to claim 1, characterized in that: The two-stage wheel-side reducer also includes a half-shaft gear sleeve (4), which is provided with a through hole. The rotating shaft of the sun gear (23) is inserted at one end of the through hole so that the rotating shaft of the sun gear (23) and the half-shaft gear sleeve (4) are axially engaged around the through hole, and one end of the half shaft (20) is inserted at the other end of the through hole so that the half shaft (20) and the half shaft gear sleeve (4) are axially engaged around the through hole.

3. The double-stage wheel reducer according to claim 2, characterized in that: The rotating shaft of the sun gear (23) is provided with a first through hole, one end of the half shaft (20) is provided with a first threaded hole corresponding to the first through hole, and a first bolt (5) passes through the first through hole and is threadedly connected to the first threaded hole.

4. The double-stage wheel reducer according to claim 1, characterized in that: The planet carrier assembly comprises a planet carrier (221), a first planetary gear shaft (222) and a second planetary gear shaft (223); the first planetary gear shaft (222) and the second planetary gear shaft (223) are both fixedly arranged on the planet carrier (221); the sun gear (23) is rotatably arranged on the planet carrier (221); the first planetary gear (24) is rotatably sleeved on the first planetary gear shaft (222); and the second planetary gear (25) is rotatably sleeved on the second planetary gear shaft (223).

5. The double-stage wheel reducer according to claim 4, characterized in that: The planet carrier (221) comprises a planet carrier bracket (2211), a first planet carrier (2212) and a second planet carrier (2213); the first planet carrier (2212) is connected to the planet carrier bracket (2211); the planet carrier bracket (2211) is fixedly connected to the shaft sleeve (201); the first planet carrier (2212) and the second planet carrier (2213) are arranged at intervals; two ends of the first planetary gear shaft (222) are respectively arranged on the first planet carrier (2212) and the second planet carrier (2213); two ends of the second planetary gear shaft (223) are respectively arranged on the first planet carrier (2212) and the second planet carrier (2213); the first planetary gear (24), the second planetary gear (25) and the sun gear (23) are all located between the first planetary gear (2212) and the second planetary gear (2213).

6. The double-stage wheel reducer according to claim 5, characterized in that: A baffle (8) is fixedly provided at one end of the rotating shaft of the sun gear (23) away from the half shaft (20), and a clamping portion is provided on the second planet carrier (2213), and the baffle (8) is clamped to the clamping portion to limit the movement of the baffle (8) relative to the second planet carrier (2213) along the axial direction of the sun gear (23).

7. The two-stage wheel reducer according to any one of claims 1 to 6, characterized in that: A plurality of second through holes are circumferentially arranged on the first gear ring (211), a plurality of second threaded holes corresponding to the plurality of second through holes are circumferentially arranged on the reducer housing (1), and a plurality of second bolts (6) pass through the plurality of second through holes in a one-to-one correspondence and are threadedly connected to the plurality of second threaded holes in a one-to-one correspondence.

8. Drive axle, characterized in that, It comprises a bridge housing (30), a shaft sleeve (201), a half shaft (20) and a two-stage wheel-side reducer as described in any one of claims 1 to 7, one end of the shaft sleeve (201) is fixedly connected to the bridge housing (30), the other end of the shaft sleeve (201) is fixedly connected to the planetary carrier bracket (2211), and the half shaft (20) passes through the bridge housing (30) and the shaft sleeve (201) in sequence and is drivingly connected to the sun gear (23).

9. The drive axle according to claim 8, characterized in that: The drive axle further comprises a wheel hub (40) and a wheel hub bearing (401); the wheel hub (40) is sleeved on the shaft sleeve (201) and is rotationally matched with the shaft sleeve (201) via the wheel hub bearing (401); One end of the reducer housing (1) is coaxially fixedly connected to the first gear ring (211), and the other end of the reducer housing (1) is coaxially fixedly connected to the wheel hub (40).

10. The drive axle according to claim 9, characterized in that: The drive axle also includes a wheel hub oil seal (402), which is sleeved on the shaft sleeve (201) and arranged on a side of the wheel hub bearing (401) away from the two-stage wheel-side reducer. The wheel hub oil seal (402) is located between the wheel hub (40) and the shaft sleeve (201) and is respectively pressed against the wheel hub (40) and the shaft sleeve (201).

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