Double-planet-row hub reduction mechanism

Abstract

The utility model belongs to the technical field of speed reducers, and particularly relates to a double-planet-row hub reduction mechanism which comprises a planet carrier A, a planet gear A is installed on the planet carrier A to form a first planet row, and an inner spline A is arranged on the inner wall of the planet carrier A; a planet carrier B is integrally formed on the motor bracket, and a planet gear B is mounted on the planet carrier B to form a second planet row; the sun gear A is rotationally embedded into the axis of the planet carrier A and meshed with the planet gear A, and a first inner spline connected with the driving shaft is integrally formed on the inner wall of the sun gear A; the sun gear B is rotationally embedded in the axis of the motor support and meshed with the planet gear B, and a first spline meshed with the internal spline A is arranged on the outer wall of the end, close to the planet carrier A, of the sun gear B; and an output housing. According to the utility model, the reduction ratio can be improved by utilizing the double planet rows, and the required reduction ratio and torque can be achieved under the condition that only the hub reduction gear is adopted, so that the volume of the reduction axle is reduced, and the trafficability of a vehicle is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of speed reducer, specifically relates to a double planetary gear train wheel edge speed reducer. BACKGROUND

[0002] At present, in the general layout of heavy truck, large bus and engineering machinery vehicle, the transmission, transfer case and transmission shaft assembly should not be too large in size and mass due to bearing large torque, and the transmission ratio should be distributed to the drive axle as large as possible.

[0003] Since the general axle main reducer is difficult to meet the above requirements, the drive axle of many heavy trucks, large buses and engineering machinery vehicles adopts single-stage (or double-stage) main reducer plus wheel edge reducer to obtain large reduction ratio and compact structure, which results in large volume of the reduction axle and poor vehicle passability. UTILITY MODEL CONTENTS

[0004] The utility model discloses a double planetary gear train wheel edge speed reducer, which can improve the reduction ratio by using double planetary gear train and achieve the required reduction ratio and torque by using only the wheel edge reducer, thereby reducing the volume of the reduction axle and improving the vehicle passability.

[0005] The technical scheme adopted by the utility model is as follows:

[0006] A double planetary gear train wheel edge speed reducer comprises:

[0007] A planet carrier A is provided with a planet wheel A and forms a first planetary gear train, and an inner spline A is arranged on the inner wall of the planet carrier A;

[0008] A motor support is integrally provided with a planet carrier B, and a planet wheel B is arranged on the planet carrier B and forms a second planetary gear train;

[0009] A sun gear A is rotatably arranged at the axis of the planet carrier A and is engaged with the planet wheel A, and the inner wall of the sun gear A is integrally provided with a first inner spline connected with a driving shaft;

[0010] A sun gear B is rotatably arranged at the axis of the motor support and is engaged with the planet wheel B, and the outer wall of one end of the sun gear B close to the planet carrier A is provided with a first spline engaged with the inner spline A;

[0011] An output housing is rotatably sleeved on the motor support, the inner wall of one end of the output housing close to the planet carrier A is fixedly embedded with a gear ring A engaged with the planet wheel A, and the inner wall of the other end of the output housing is integrally provided with a gear ring B engaged with the planet wheel B.

[0012] As a preferred solution, the sun gear A and the sun gear B are coaxially arranged, and use the same driving shaft.

[0013] As a preferred solution, the planetary gear A is arranged in a ring array around the axis of the sun gear A, and is fixedly installed on the planetary carrier A through the planetary fixing shaft A.

[0014] As a preferred solution, the planetary gear B is arranged in a ring array around the axis of the sun gear B, and is fixedly installed on the planetary carrier B through the planetary fixing shaft B.

[0015] As a preferred solution, the motor support is in the shape of a cylinder, and a first flange for installing a driving motor is integrally formed on one end of the motor support away from the output housing.

[0016] As a preferred solution, the output housing is in the shape of a cylinder, and a second flange for installing a tire is integrally formed on the middle part of the output housing, and the output housing is rotatably sleeved with the motor support through the first bearing and the second bearing.

[0017] The utility model discloses the beneficial effects are:

[0018] The utility model discloses a double planetary row wheel edge reduction structure, which is smaller in size compared with a traditional composite reduction structure and a single reduction bridge main reducer, so that the wheel edge reduction bridge has a smaller ground clearance and is more passable, is suitable for complex road surfaces, and the double planetary row reduction structure has a larger reduction ratio, a large torque and strong driving force.

[0019] The double planetary row wheel edge reduction structure can be independently configured for each wheel, so that each wheel independently outputs and independently changes the torque, realizes dynamic matching of the inside and outside wheel torque difference and the steering angle, and in the case of high-speed cornering, the outside rear wheel actively increases the torque and the steering angle, the push head phenomenon is inhibited, and the driving experience and safety are improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is the longitudinal section structure schematic diagram of the double planetary row wheel edge reduction mechanism of the utility model embodiment;

[0021] Figure 2 is another longitudinal section structure schematic diagram of the double planetary row wheel edge reduction mechanism of the utility model embodiment;

[0022] Figure 3is a sectional view structure schematic diagram of the first planetary row of the double planetary row wheel edge reduction mechanism of the embodiment of the utility model;

[0023] Figure 4 is a sectional view structure schematic diagram of the second planetary row of the double planetary row wheel edge reduction mechanism of the embodiment of the utility model;

[0024] Figure 5 is a component diagram of the double planetary row wheel edge reduction mechanism of the embodiment of the utility model;

[0025] Figure 6 is a three-dimensional structure schematic diagram of the first planetary row of the double planetary row wheel edge reduction mechanism of the embodiment of the utility model;

[0026] Figure 7 is an integrated structure schematic diagram of the first flange, motor support and planet carrier B of the embodiment of the utility model;

[0027] Figure 8 is an appearance three-dimensional structure schematic diagram of the double planetary row wheel edge reduction mechanism of the embodiment of the utility model.

[0028] Reference signs: 1, planet carrier A; 11, planetary gear A; 12, planet fixed shaft A; 13, inner spline A; 2, motor support; 21, planet carrier B; 22, planetary gear B; 23, planet fixed shaft B; 24, first flange; 3, sun gear A; 31, first inner spline; 4, sun gear B; 41, first spline; 5, output housing; 51, gear ring B; 52, gear ring A; 53, second flange; 6, first bearing; 7, second bearing; 8, sealing ring. DETAILED DESCRIPTION

[0029] The technical scheme of the utility model is further described below in combination with the drawings and embodiments.

[0030] With reference to Figures 1-8 The double planetary row wheel edge reduction mechanism provided by the embodiment of the utility model comprises an output housing 5, a first planetary row and a second planetary row. The planet carrier A1 of the first planetary row is connected with the sun gear B4 of the second planetary row, the input end is connected with the sun gear A3, and the output end is connected with the sun gear B4. The first planetary row is an input unit, and the second planetary row is an output unit. The reduction ratio of the double planetary row wheel edge reduction mechanism of the embodiment of the utility model is the product of the reduction ratios of the first planetary row and the second planetary row, and the output housing 5 is driven to move.

[0031] With reference to Figure 1 And Figure 2The planetary gear A1 is fixedly installed with the planetary gear A11 through the planetary fixed shaft A12 to form a first planetary gear train, and is provided with an inner spline A13 on the inner wall of the planetary gear A1. The motor support 2 is integrally formed with the planetary gear B21, and is fixedly installed with the planetary gear B22 through the planetary fixed shaft B23 to form a second planetary gear train, and the planetary gear B21 is coaxially arranged with the planetary gear A1. The sun gear A3 is rotatably embedded at the axis of the planetary gear A1, and is engaged with the planetary gear A11. The first inner spline 31 is integrally formed on the inner wall of the sun gear A3 to connect the driving end of the driving motor and provide driving force for the sun gear A3. The sun gear B4 is rotatably embedded at the axis of the motor support 2, and is engaged with the planetary gear B22. The sun gear B4 is provided with the first spline 41 on the outer wall of one end of the planetary gear A1, and is engaged with the inner spline A13 to drive the planetary gear A1 as the input end of the first planetary gear train through the sun gear B4 and provide driving force for the planetary gear A1.

[0032] Further, in the embodiment, the sun gear A and the sun gear B are coaxially arranged, and are driven by the driving shaft of the same driving motor to realize coaxial and same direction driving. Of course, in some other embodiments, different driving motors can be used for driving respectively.

[0033] Referring to Figure 1 and Figure 2 , the output housing 5 is rotatably sleeved on the motor support 2 through the first bearing 6 and the second bearing 7, and the input end is annularly sealed by the sealing ring 8 to prevent water and dust. Meanwhile, the output housing 5 is fixedly embedded with the ring gear A52 on the inner wall of one end of the planetary gear A1 to engage with the planetary gear A11, and is integrally formed with the ring gear B51 on the inner wall of the other end to engage with the planetary gear B22.

[0034] Referring to Figure 3 and Figure 4 , in the embodiment, the planetary gear A11 is provided with three planetary gears, which are arranged in an annular array around the axis of the sun gear A3. Meanwhile, the planetary gear B22 is also provided with three planetary gears, which are arranged in an annular array around the axis of the sun gear B4. In addition, the planetary gear A can also be provided with four, five or six planetary gears according to specific use scenarios, and correspondingly, the planetary gear B can also be provided with four, five or six planetary gears.

[0035] Referring to Figure 5 , Figures 7-8In the embodiment, the motor support 2 is in the shape of a cylinder, and a first flange 24 for mounting a driving motor is integrally formed at one end away from the output housing 5; the output housing 5 is in the shape of a cylinder, and a second flange 53 for mounting a tire is integrally formed at the middle of the output housing 5; by virtue of the structural feature of the cylinder, the volume of the double planetary row wheel edge speed reduction mechanism of the embodiment can be smaller, thereby reducing the volume of the vehicle speed reduction axle, and improving the passability of the vehicle.

[0036] Of course, in some other embodiments, the shapes of the output housing and the motor support can be selected according to specific use scenarios, and designed into the required shapes, such as regular tetrahedron, regular hexahedron, and other polygonal columns.

[0037] It should be noted that in the embodiment, the ring gear is fixed, the sun gear is driven, and the planet carrier is passive, and the speed reduction ratio calculation formula of the double planetary row wheel edge speed reduction mechanism of the embodiment is: ; wherein, and respectively represent the number of teeth of the ring gear A and the ring gear B, and respectively represent the number of teeth of the sun gear A and the sun gear B.

[0038] In the embodiment, the speed reduction ratio of the first speed reduction mechanism composed of the ring gear A with 107 teeth and the sun gear A with 16 teeth is 7.6875, and the speed reduction ratio of the second speed reduction mechanism composed of the ring gear B with 120 teeth and the sun gear B with 21 teeth is 6.714; thus, the total speed reduction ratio of the wheel edge speed reduction mechanism in the embodiment is the product of the speed reduction ratio of the first speed reduction mechanism and the speed reduction ratio of the second speed reduction mechanism, i.e. 7.6875*6.714=51.61, thereby reducing the volume of the speed reduction mechanism while increasing the speed reduction ratio, and the torque, driving force and passability are strong, and it is more suitable for complex road surfaces.

[0039] In specific use scenarios, the number of teeth of the ring gear or / and the number of teeth of the sun gear can be appropriately changed, and the number of planetary rows can be increased, thereby realizing multiple speed reduction ratios and torques; the load can also be increased by changing the number of planetary gears.

[0040] Referring to Figures 1-6The working principle of the double planetary row wheel edge reduction mechanism is as follows: in use, the sun gear A3 is a driving gear, the input shaft is inserted into the first inner spline 31 of the sun gear A3, the sun gear A3 is engaged with the three planetary gears A11, thereby driving the three planetary gears A11 to rotate, the three planetary gears A11 are engaged with the ring gear A52, the ring gear A52 is embedded on the output housing 5, and the ring gear A52 is a fixed component; the three planetary gears A11 are evenly fixed on the planetary carrier A1 through the three planetary fixed shafts A12, the three planetary gears A11 are freely rotatable, the three planetary gears A11 and the planetary carrier A1 are combined into an integral whole, the planetary carrier A1 is an output component, and thus the first-stage reduction is formed; the sun gear B4 is inserted into the inner spline A13 of the planetary carrier A1 through the first spline 41, the sun gear B4 is engaged with the three planetary gears B22, the three planetary gears B22 are evenly fixed on the planetary carrier B21 through the three planetary fixed shafts B23, the planetary carrier B21 is a fixed component, the planetary carrier B21 is connected with the input driving motor through the first flange 24, the ring gear A52 and the ring gear B51 are fixed on the output housing 5, the planetary carrier B21 becomes a total output, and the tire is directly connected with the planetary carrier B21 through the second flange 53, the output is realized, and thus the large reduction ratio output is completed.

[0041] Compared with the traditional composite reduction structure and the main reducer of the single reducer bridge, the double planetary row wheel edge reduction structure is smaller in size, so that the ground clearance of the wheel edge reduction bridge is smaller, the passability is stronger, is suitable for complex road surfaces, and the double planetary row reduction structure has a larger reduction ratio, a large torque and strong driving force; the output housing can directly replace the hub to assemble the tire through the second flange, and the installation is more convenient.

[0042] The double planetary row wheel edge reduction structure can be independently configured on each wheel, so that each wheel is independently outputted, the independent torque is changed, the dynamic matching of the inside and outside wheel torque difference and the steering angle is realized, so that in the case of high-speed turning, the outside rear wheel actively increases the torque and increases the steering angle, the pushing head phenomenon can be inhibited, and the driving experience and safety are improved.

[0043] The above specific embodiments further illustrate the purpose, technical scheme and advantages of the utility model, and it should be understood that the above description is only a specific embodiment of the utility model, and is not used to limit the utility model, and any modification, equivalent replacement, improvement and the like within the spirit and principle of the utility model should be included in the protection range of the utility model.

Claims

1. A double planetary row wheel rim reduction mechanism, characterized in that, It includes: The planetary carrier A (1) is installed with the planetary gear A (11) to form the first planetary row, and the inner wall of the planetary carrier A (1) is provided with the inner spline A (13); The motor support (2) is integrally formed with the planetary carrier B (21) on it, and the planetary gear B (22) is installed on the planetary carrier B (21) to form the second planetary row; The sun gear A (3) is rotatably embedded in the shaft center of the planetary carrier A (1) and engaged with the planetary gear A (11), and the inner wall of the sun gear A (3) is integrally formed with the first inner spline (31) connected with the driving shaft; The sun gear B (4) is rotatably embedded in the shaft center of the motor support (2) and engaged with the planetary gear B (22), and the sun gear B (4) is provided with the first spline (41) engaged with the inner spline A (13) on the outer wall of one end close to the planetary carrier A (1); The output housing (5) is rotatably sleeved on the motor support (2), and the output housing (5) is fixedly embedded with the ring gear A (52) engaged with the planetary gear A (11) on the inner wall of one end close to the planetary carrier A (1), and the ring gear B (51) engaged with the planetary gear B (22) is integrally formed on the other end inner wall.

2. The dual planetary row wheel rim reduction mechanism of claim 1, wherein: The sun gear A (3) and the sun gear B (4) are coaxially arranged and use the same driving shaft.

3. The dual planetary row wheel rim reduction mechanism of claim 1, wherein: The planetary gear A (11) is arranged in at least three and arranged in a ring array around the axis of the sun gear A (3), and the planetary gear A (11) is fixedly installed on the planetary carrier A (1) through the planetary fixed shaft A (12).

4. The dual planetary row wheel rim reduction mechanism of claim 1, wherein: The planetary gear B (22) is arranged in at least three and arranged in a ring array around the axis of the sun gear B (4), and the planetary gear B (22) is fixedly installed on the planetary carrier B (21) through the planetary fixed shaft B (23).

5. The dual planetary row hub reduction mechanism of claim 1, wherein: The shape of the motor support (2) is a cylinder, and the first flange (24) for installing the driving motor is integrally formed on one end of the motor support (2) away from the output housing (5).

6. The dual planetary row hub reduction mechanism of claim 1, wherein: The shape of the output housing (5) is a cylinder, and the second flange (53) for installing the tire is integrally formed on the middle part of the output housing (5), and the output housing (5) is rotatably sleeved with the motor support (2) through the first bearing (6) and the second bearing (7).

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