A single-stage high-speed ratio planetary reducer

Abstract

The present invention belongs to the field of vehicle transmission technology, and specifically relates to a one-stage high-speed ratio planetary reducer. The one-stage high-speed ratio planetary reducer comprises: a double internal meshing planetary row, a second lip seal, a wheel hub, an input flange, a first deep groove ball bearing, a fixing flange, a third lip seal, a first thrust bearing, a first needle bearing, a second deep groove ball bearing, a second thrust bearing, a second needle bearing, and a third needle bearing; compared with the prior art, the present invention provides a one-stage high-speed ratio wheel-side planetary reducer, which adopts a double internal meshing planetary row, reduces the number of parts and size of the reducer, reduces the weight, reduces the manufacturing cost, and can provide a larger reduction ratio.

Description

Technical Field

[0001] The invention belongs to the technical field of vehicle transmission, and in particular relates to a single-stage large-speed ratio planetary reducer. Background Art

[0002] The wheel hub electric drive system is usually composed of a drive motor, a reduction mechanism, a brake and a cooling system, commonly known as an electric wheel. Military wheeled armored vehicles usually adopt an electric wheel solution of "high-speed inner rotor motor + fixed speed ratio reducer". In order to obtain a higher power density, the motor speed is usually as high as 10,000r / min, and the reducer generally adopts a reducer with a transmission ratio of more than 10. However, since the speed ratio of a traditional single planetary gear is between 2.5 and 5, the current electric wheel reducer generally adopts a structural solution of multiple simple planetary gears in series, which is difficult to lubricate, difficult to dissipate heat, fast gear wear, and low reducer reliability; and the large size and weight of the electric wheel leads to a large unsprung mass of the vehicle, poor handling stability and smoothness, so there is an urgent need to design a highly compact and large speed ratio reducer as an important method to solve this problem. Summary of the invention

[0003] 1. Technical issues to be resolved

[0004] The technical problem to be solved by the present invention is: how to provide a large speed ratio planetary reducer to solve the problem of achieving a large speed ratio by currently using multi-stage planetary transmission.

[0005] (II) Technical solution

[0006] In order to solve the above technical problems, the present invention provides a one-stage high-speed ratio planetary reducer, which includes: a double internal meshing planetary row, a second lip seal 5, a hub 6, an input flange 10, a first deep groove ball bearing 9, a fixing flange 8, a third lip seal 12, a first thrust bearing 13, a first needle roller bearing 17, a second deep groove ball bearing 18, a second thrust bearing 19, a second needle roller bearing 20, and a third needle roller bearing 21;

[0007] The double internal meshing planetary gear set includes three basic elements: a sun gear 3, a ring gear 7, and a planet carrier 11, through which motion and power are transmitted; and the double internal meshing planetary gear set also includes a planetary gear 16, which is used to act as an intermediate element between the three basic elements;

[0008] The fixing flange 8 is connected to the gear ring 7 to fix the gear ring 7. The fixing flange 8 is located on the planet carrier 11 through the first deep groove ball bearing 9. The third lip seal ring 12 is located between the input flange 10 and the planet carrier 11 to form a left end seal of the reducer.

[0009] The gear ring 7 is connected to the outer rings of the first needle roller bearing 17 and the second deep groove ball bearing 18 respectively, the rollers of the first needle roller bearing 17 and the inner rings of the second deep groove ball bearing 18 are both placed on the sun gear 3, and the second lip seal 5 is located between the gear ring 7 and the sun gear 3 to form a right end seal of the reducer;

[0010] The planet carrier 11 is connected to the input flange 10 to input power, and the planet carrier 11 is connected to the inner ring of the first deep groove ball bearing 9, the left end face of the first thrust bearing 13 and the left end face of the second thrust bearing 19;

[0011] The sun gear 3 is meshed with the planet gear 16, connected with the roller of the first needle roller bearing 17 and the outer ring of the third needle roller bearing 21, and the inner ring of the second deep groove ball bearing 18, and is axially positioned with the planet carrier 11 through the second thrust bearing 19, and is connected with the wheel hub 6;

[0012] The planetary gear 16 is meshed with the sun gear 3 and the ring gear 7 at the same time. The planetary gear 16 is placed on the planetary carrier 11 through the second needle bearing 20 and is axially positioned with the planetary carrier 11 through the first thrust bearing 13 .

[0013] Among them, the large reduction ratio of the one-stage large speed ratio planetary reducer is 1 / 1-k, where k is a characteristic parameter of the planetary gear, and its value is the ratio between the product of the number of teeth of the ring gear 7 and the number of small external teeth of the planetary gear 16 and the product of the number of teeth of the sun gear 3 and the number of external teeth of the planetary gear 16.

[0014] The reducer further includes a first bolt 14 ; the fixing flange 8 is connected to the ring gear 7 via the first bolt 14 .

[0015] The reducer further comprises a second bolt 15 for connecting the wheel hub 6 and the outer rim.

[0016] The planet carrier 11 is connected to the input flange 10 via splines.

[0017] The sun gear 3 and the hub 6 are connected via splines.

[0018] Wherein, the reducer further comprises: a snap ring 2 and a locking nut 1;

[0019] The hub 6 and the sun gear 3 are axially limited by a retaining ring 2 and a locking nut 1 .

[0020] The reducer further includes: a first lip seal ring 4, located between the sun gear 3 and the ring gear 7, to prevent the lubricating oil from flowing out.

[0021] Among them, in the double internal meshing planetary row, the sun gear 3 is an internal gear, the planetary gear 16 has internal and external teeth, the ring gear 7 is an internal gear, the internal teeth of the planetary gear 16 are internally meshed with the internal teeth of the sun gear 3, and the external teeth of the planetary gear 16 are internally meshed with the internal teeth of the ring gear 7, which is the so-called double internal meshing, thereby realizing the braking of the ring gear 7, the input of the planet carrier 11, and the output of the sun gear 3, so as to give full play to the large reduction ratio characteristics of this planetary row.

[0022] Among them, the first-stage large-speed ratio planetary reducer is suitable for a wheel hub electric drive system using an electric motor as a power source.

[0023] (III) Beneficial effects

[0024] Compared with the prior art, the present invention provides a one-stage large speed ratio wheel-side planetary reducer, which adopts a double internal meshing planetary gear, reduces the number of parts and size of the reducer, reduces weight, reduces manufacturing costs, and can provide a larger reduction ratio. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a two-dimensional cross-sectional view of the first-stage high-speed ratio wheel-side planetary reducer of the present invention.

[0026] Figure 2 It is a schematic diagram of the mechanism of the present invention. DETAILED DESCRIPTION

[0027] In order to make the purpose, content, and advantages of the present invention more clear, the specific implementation methods of the present invention are further described in detail below in conjunction with the accompanying drawings and examples.

[0028] To solve the above technical problems, Figure 1 and Figure 2 As shown, the present invention provides a one-stage high-speed ratio planetary reducer, which includes: a double internal meshing planetary row, a second lip seal ring 5, a hub 6, an input flange 10, a first deep groove ball bearing 9, a fixing flange 8, a third lip seal ring 12, a first thrust bearing 13, a first needle roller bearing 17, a second deep groove ball bearing 18, a second thrust bearing 19, a second needle roller bearing 20, and a third needle roller bearing 21;

[0029] The double internal meshing planetary gear set includes three basic elements: a sun gear 3, a ring gear 7, and a planet carrier 11, through which motion and power are transmitted; and the double internal meshing planetary gear set also includes a planetary gear 16, which is used to act as an intermediate element between the three basic elements;

[0030] The fixing flange 8 is connected to the gear ring 7 to fix the gear ring 7. The fixing flange 8 is located on the planet carrier 11 through the first deep groove ball bearing 9. The third lip seal ring 12 is located between the input flange 10 and the planet carrier 11 to form a left end seal of the reducer.

[0031] The gear ring 7 is connected to the outer rings of the first needle roller bearing 17 and the second deep groove ball bearing 18 respectively, the rollers of the first needle roller bearing 17 and the inner rings of the second deep groove ball bearing 18 are both placed on the sun gear 3, and the second lip seal 5 is located between the gear ring 7 and the sun gear 3 to form a right end seal of the reducer;

[0032] The planet carrier 11 is connected to the input flange 10 to input power, and the planet carrier 11 is connected to the inner ring of the first deep groove ball bearing 9, the left end face of the first thrust bearing 13 and the left end face of the second thrust bearing 19;

[0033] The sun gear 3 is meshed with the planet gear 16, connected with the roller of the first needle roller bearing 17 and the outer ring of the third needle roller bearing 21, and the inner ring of the second deep groove ball bearing 18, and is axially positioned with the planet carrier 11 through the second thrust bearing 19, and is connected with the wheel hub 6;

[0034] The planetary gear 16 is meshed with the sun gear 3 and the ring gear 7 at the same time. The planetary gear 16 is placed on the planetary carrier 11 through the second needle bearing 20 and is axially positioned with the planetary carrier 11 through the first thrust bearing 13 .

[0035] Among them, the large reduction ratio of the one-stage large speed ratio planetary reducer is 1 / 1-k, where k is a characteristic parameter of the planetary gear, and its value is the ratio between the product of the number of teeth of the ring gear 7 and the number of small external teeth of the planetary gear 16 and the product of the number of teeth of the sun gear 3 and the number of external teeth of the planetary gear 16.

[0036] The reducer further includes a first bolt 14 ; the fixing flange 8 is connected to the ring gear 7 via the first bolt 14 .

[0037] The reducer further comprises a second bolt 15 for connecting the wheel hub 6 and the outer rim.

[0038] The planet carrier 11 is connected to the input flange 10 via splines.

[0039] The sun gear 3 and the hub 6 are connected via splines.

[0040] Wherein, the reducer further comprises: a snap ring 2 and a locking nut 1;

[0041] The hub 6 and the sun gear 3 are axially limited by a retaining ring 2 and a locking nut 1 .

[0042] The reducer further includes: a first lip seal ring 4, located between the sun gear 3 and the ring gear 7, to prevent the lubricating oil from flowing out.

[0043] Among them, in the double internal meshing planetary row, the sun gear 3 is an internal gear, the planetary gear 16 has internal and external teeth, the ring gear 7 is an internal gear, the internal teeth of the planetary gear 16 are internally meshed with the internal teeth of the sun gear 3, and the external teeth of the planetary gear 16 are internally meshed with the internal teeth of the ring gear 7, which is the so-called double internal meshing, thereby realizing the braking of the ring gear 7, the input of the planet carrier 11, and the output of the sun gear 3, so as to give full play to the large reduction ratio characteristics of this planetary row.

[0044] Among them, the first-stage large-speed ratio planetary reducer is suitable for a wheel hub electric drive system using an electric motor as a power source.

[0045] Example 1

[0046] Figure 1 As shown, a single-stage large speed ratio planetary reducer of this embodiment is suitable for a wheel hub electric drive system using an electric motor as a power source.

[0047] like Figure 1 As shown, this figure is a two-dimensional cross-sectional view of a first-stage large speed ratio planetary reducer of the present invention. Figure 2 The schematic diagram of the mechanism of the present invention is different from the traditional planetary gear. The present scheme adopts double internal meshing transmission, and the sun gear 3 is an internal gear, the planetary gear 16 has internal and external teeth, the ring gear 7 is an internal gear, the internal teeth of the planetary gear 16 are internally meshed with the internal teeth of the sun gear 3, and the external teeth of the planetary gear 16 are internally meshed with the internal teeth of the ring gear 7, which is the so-called double internal meshing. The present invention brakes the ring gear 7, the planet carrier 11 inputs, and the sun gear 3 outputs, so as to give full play to the large reduction ratio characteristics of this planetary gear.

[0048] The main body of the present invention is a double internal meshing planetary gear, which includes three basic elements, namely a sun gear 3, a ring gear 7, and a planet carrier 11, through which motion and power are transmitted, wherein the planet gear 16 is an intermediate element.

[0049] The fixed flange 8 is connected to the ring gear 7 by the first bolt 14 to fix the ring gear 7. The fixed flange 8 is located on the planet carrier 11 through the first deep groove ball bearing 9. The third lip seal ring 12 is located between the input flange 10 and the planet carrier 11 to form a left end seal of the reducer.

[0050] The gear ring 7 is connected to the outer ring of the first needle roller bearing 17 and the second deep groove ball bearing 18. The roller of the first needle roller bearing 17 and the inner ring of the second deep groove ball bearing 18 are both placed on the sun gear 3. The second lip seal 5 is located between the gear ring 7 and the sun gear 3 to form a right end seal of the reducer.

[0051] The planet carrier 11 is connected to the input flange 10 through a spline, so as to input power. The planet carrier 11 is connected to the inner ring of the first deep groove ball bearing 9, the left end face of the first thrust bearing 13 and the left end face of the second thrust bearing 19;

[0052] The sun gear 3 is meshed with the planet gear 16, connected with the roller of the first needle roller bearing 17 and the outer ring of the third needle roller bearing 21, and the inner ring of the second deep groove ball bearing 18, and is axially positioned with the planet carrier 11 through the second thrust bearing 19, and is connected with the wheel hub 66 through a spline, and the wheel hub 6 and the sun gear 3 are axially limited by the retaining ring 2 and the locking nut 1;

[0053] The planetary gear 16 is meshed with the sun gear 3 and the ring gear 7 at the same time. The planetary gear 16 is placed on the planetary carrier 11 through the second needle bearing 20 and is axially positioned with the planetary carrier 11 through the first thrust bearing 13 .

[0054] The reduction ratio of the present invention is 1 / (1-k), wherein k is a characteristic parameter of the planetary gear, and its value is the ratio between the product of the number of teeth of the ring gear 7 and the number of small external teeth of the planetary gear 16 and the product of the number of teeth of the sun gear 3 and the number of external teeth of the planetary gear 16. The reducer of the present invention can achieve a corresponding large reduction ratio when the number of teeth in Table 1 is taken.

[0055] Table 1 Gear matching scheme to achieve large reduction ratio

[0056] Sun gear teeth number Number of planetary gear outer teeth Number of teeth in planetary gear Ring gear teeth number Reduction ratio 19 17 37 39 17.575 20 17 37 40 12.33333 21 17 37 41 9.7125 22 17 37 42 8.14 23 17 37 43 7.091667 24 17 37 44 6.342857 25 17 37 45 5.78125

[0057] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A single-stage high-speed ratio planetary reducer, characterized in that: The one-stage high-speed ratio planetary reducer comprises: a double internal meshing planetary row, a second lip seal ring (5), a wheel hub (6), an input flange (10), a first deep groove ball bearing (9), a fixing flange (8), a third lip seal ring (12), a first thrust bearing (13), a first needle roller bearing (17), a second deep groove ball bearing (18), a second thrust bearing (19), a second needle roller bearing (20), and a third needle roller bearing (21); The double internal meshing planetary gear train comprises three basic elements: a sun gear (3), a ring gear (7), and a planet carrier (11), through which motion and power are transmitted; and the double internal meshing planetary gear train further comprises a planetary gear (16), which is used to act as an intermediate element between the three basic elements; The fixing flange (8) is connected to the gear ring (7) to fix the gear ring (7); the fixing flange (8) is located on the planet carrier (11) through the first deep groove ball bearing (9); the third lip seal ring (12) is located between the input flange (10) and the planet carrier (11) to form a left end seal of the reducer; The gear ring (7) is connected to the outer rings of the first needle roller bearing (17) and the second deep groove ball bearing (18) respectively, the roller of the first needle roller bearing (17) and the inner ring of the second deep groove ball bearing (18) are both placed on the sun gear (3), and the second lip seal ring (5) is located between the gear ring (7) and the sun gear (3) to form a right end seal of the reducer; The planet carrier (11) is connected to the input flange (10) to input power, and the planet carrier (11) is connected to the inner ring of the first deep groove ball bearing (9), the left end face of the first thrust bearing (13) and the left end face of the second thrust bearing (19); The sun gear (3) is meshed with the planet gear (16), connected with the roller of the first needle roller bearing (17), the outer ring of the third needle roller bearing (21), and the inner ring of the second deep groove ball bearing (18), axially positioned with the planet carrier (11) through the second thrust bearing (19), and connected with the wheel hub (6); The planetary gear (16) is meshed with the sun gear (3) and the ring gear (7) at the same time. The planetary gear (16) is placed on the planetary carrier (11) via a second needle bearing (20) and is axially positioned with the planetary carrier (11) via a first thrust bearing (13). In the double internal meshing planetary gear, the sun gear (3) is an internal gear, the planet gear (16) has internal and external teeth, the ring gear (7) is an internal gear, the internal teeth of the planet gear (16) are internally meshed with the internal teeth of the sun gear (3), and the external teeth of the planet gear (16) are internally meshed with the internal teeth of the ring gear (7), i.e., so-called double internal meshing, thereby achieving the ring gear (7) braking, the planet carrier (11) input, and the sun gear (3) output, so as to give full play to the large reduction ratio characteristics of this planetary gear.

2. The one-stage high speed ratio planetary reducer according to claim 1, characterized in that: The large reduction ratio of the one-stage large speed ratio planetary reducer is 1 / (1-k), wherein k is a characteristic parameter of the planetary gear, and its value is the ratio between the product of the number of teeth of the ring gear (7) and the number of small external teeth of the planetary gear (16) and the product of the number of teeth of the sun gear (3) and the number of external teeth of the planetary gear (16).

3. The one-stage high speed ratio planetary reducer according to claim 1, characterized in that: The reducer further comprises a first bolt (14); the fixing flange (8) and the gear ring (7) are connected via the first bolt (14).

4. The one-stage high speed ratio planetary reducer according to claim 1, characterized in that: The reducer also includes a second bolt (15) for connecting the wheel hub (6) and the outer rim.

5. The one-stage high speed ratio planetary reducer according to claim 1, characterized in that: The planet carrier (11) is connected to the input flange (10) via splines.

6. The one-stage high speed ratio planetary reducer according to claim 1, characterized in that: The sun gear (3) and the wheel hub (6) are connected via splines.

7. The one-stage high speed ratio planetary reducer according to claim 1, characterized in that: The reducer further comprises: a snap ring (2) and a locking nut (1); The wheel hub (6) and the sun gear (3) are axially limited by a clamping ring (2) and a locking nut (1).

8. The one-stage high speed ratio planetary reducer according to claim 1, characterized in that: The reducer also includes: a first lip seal ring (4), which is located between the sun gear (3) and the ring gear (7) to prevent lubricating oil from flowing out.

9. The one-stage high speed ratio planetary reducer according to claim 1, characterized in that: The one-stage large speed ratio planetary reducer is suitable for a wheel hub electric drive system using an electric motor as a power source.

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