A reducer and an in-wheel motor applying the same

Abstract

The utility model discloses a kind of reducer and the wheel hub motor applied to it, belong to the technical field of reducer, solve the problem of low reduction ratio and not high practicality of single planetary reducer in prior art.A kind of reducer, including first planetary gear train, second planetary gear train and frame, one end of first planetary gear train is connected with motor assembly in the wheel hub motor, the other end of first planetary gear train is connected with one side of frame, the other side of frame is connected with second planetary gear train, second planetary gear train is connected with one-way clutch in the wheel hub motor;When using, motor assembly in the wheel hub motor power transmission to the first planetary gear train carries out one-stage reduction, frame power transmission to second planetary gear train after one-stage reduction carries out two-stage reduction.The reducer of the utility model improves reduction ratio by two-stage reduction, so that when the reducer is applied in wheel hub motor, its adaptability is increased.

Description

Technical Field

[0001] This utility model belongs to the field of speed reducer technology, specifically relating to a speed reducer and a hub motor using the same. Background Technology

[0002] Bicycles are currently very popular, used for long-distance riding such as trips, commutes, and races. Shifting gears is often necessary during riding. A derailleur is essential for any multi-speed bicycle, and planetary gearboxes offer greater flexibility in practical use. However, single planetary gearboxes are currently the most common, but they suffer from low reduction ratios and limited practicality. Utility Model Content

[0003] The purpose of this utility model is to provide a speed reducer and a hub motor using the same, aiming to solve the problems of low reduction ratio and low practicality of existing single planetary speed reducers.

[0004] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0005] A speed reducer, applied to a hub motor, includes a first planetary gear train, a second planetary gear train, and a frame. One end of the first planetary gear train is connected to a motor assembly in the hub motor, and the other end of the first planetary gear train is connected to one side of the frame. The other side of the frame is connected to the second planetary gear train, and the second planetary gear train is connected to a one-way clutch in the hub motor. In use, the motor assembly in the hub motor transmits power to the first planetary gear train for primary speed reduction, and the frame transmits the power after primary speed reduction to the second planetary gear train for secondary speed reduction.

[0006] In some embodiments, the first planetary gear train is movably connected to the frame.

[0007] In some embodiments, the frame includes a planetary carrier and a second sun gear disposed in the middle of the planetary carrier, the second sun gear being movably connected to the first planetary gear train.

[0008] In some embodiments, the first planetary gear train includes a first sun gear, a first planet gear, and a first ring gear. The first sun gear is connected to the output shaft of the motor assembly in the hub motor. The first sun gear meshes with the first planet gear. The first planet gear is located on one side of the frame. The first planet gear meshes with the first ring gear. The first ring gear is fixedly connected to the motor assembly in the hub motor.

[0009] In some embodiments, the second planetary gear train includes a second planetary gear and a second ring gear. The second planetary gear is located on the other side of the frame. The second sun gear meshes with the second planetary gear. The second planetary gear meshes with the second ring gear. The second ring gear is connected to a one-way clutch in the hub motor.

[0010] In some embodiments, fixed shafts are provided on both sides of the frame, and the first planetary gear and the second planetary gear are disposed on the fixed shafts.

[0011] In some embodiments, both the first planetary gear and the second planetary gear are provided in multiples; the number of the second planetary gears is greater than the number of the first planetary gears.

[0012] In some embodiments, both the first planetary gear and the second planetary gear are connected to the fixed shaft via bearings.

[0013] In some embodiments, the first gear ring has a first protrusion on its end face facing the motor assembly in the hub motor, and the first gear ring is fixedly connected to the motor assembly in the hub motor through the protrusion; the second gear ring has a second protrusion on its end face away from the first planetary gear train, and the second gear ring is connected to the one-way clutch in the hub motor through the second protrusion.

[0014] Another technical solution of this utility model is implemented as follows: a hub motor includes a motor assembly in the hub motor, a one-way clutch in the hub motor, and a reducer. The motor assembly in the hub motor is connected to the reducer, and the reducer is connected to the one-way clutch in the hub motor.

[0015] Compared with the prior art, the reducer in this utility model is placed in the hub motor during use. The motor assembly in the hub motor transmits power to the first planetary gear train for first-stage reduction, and the frame transmits the power after first-stage reduction to the second planetary gear train for second-stage reduction. The reducer improves the reduction ratio through two-stage reduction, which increases its adaptability when applied to hub motors. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a speed reducer provided in Embodiment 1 of this utility model;

[0017] Figure 2 This is another structural schematic diagram of a speed reducer provided in Embodiment 1 of this utility model;

[0018] Figure 3 This is a schematic diagram of the frame structure provided in Embodiment 1 of this utility model;

[0019] Figure 4 This is a cross-sectional view of a speed reducer provided in Embodiment 1 of this utility model.

[0020] In the diagram, 1. First planetary gear train, 11. First sun gear, 12. First planet gear, 13. First gear ring, 131. First protrusion, 2. Second planetary gear train, 21. Second planet gear, 22. Second gear ring, 221. Second protrusion, 3. Carrier, 31. Planet carrier, 32. Second sun gear. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0022] In the description of this utility model, it should be clarified that the terms "vertical," "lateral," "longitudinal," "front," "rear," "left," "right," "up," "down," and "horizontal," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are merely for the convenience of describing this utility model. They do not imply that the device or element referred to must have a specific orientation or position, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, it should be noted that unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] Example 1

[0024] The present invention provides a speed reducer in embodiment 1, which is applied to a hub motor, such as... Figure 1 and Figure 2 As shown, the device includes a first planetary gear train 1, a second planetary gear train 2, and a frame 3. One end of the first planetary gear train 1 is connected to the motor assembly in the hub motor, and the other end of the first planetary gear train 1 is connected to one side of the frame 3. The other side of the frame 3 is connected to the second planetary gear train 2, and the second planetary gear train 2 is connected to a one-way clutch in the hub motor. In use, the motor assembly in the hub motor transmits power to the first planetary gear train 1 for first-stage reduction, and the frame 3 transmits the power after first-stage reduction to the second planetary gear train 2 for second-stage reduction.

[0025] After adopting the above scheme, when in use, the reducer is placed in the hub motor. The motor assembly in the hub motor transmits power to the first planetary gear train 1 for first-stage reduction. The frame 3 transmits the power after first-stage reduction to the second planetary gear train 2 for second-stage reduction. The reducer improves the reduction ratio through two-stage reduction, which increases its adaptability when applied to hub motors.

[0026] Furthermore, traditional multi-stage transmission reduction often uses multiple planetary carriers, while this reducer achieves two-stage reduction by setting a carrier 3 and placing the first planetary gear train 1 and the second planetary gear train 2 on both sides of the carrier 3, which simplifies the mechanism and makes the reducer smaller and the transmission structure more compact.

[0027] In the specific implementation process of this embodiment 1, such as Figure 1 As shown, the first planetary gear train 1 is movably connected to the frame 3.

[0028] More specifically, when the motor assembly in the hub motor transmits power to the first planetary gear train 1, the first planetary gear train 1 is movably connected to the frame 3, thereby transmitting power to the frame 3.

[0029] In the specific implementation process of this embodiment 1, such as Figure 3 As shown, the frame 3 includes a planetary carrier 31 and a second sun gear 32 disposed in the middle of the planetary carrier 31. The second sun gear 32 is movably connected to the first planetary gear train 1.

[0030] More specifically, the first planetary gear train 1 transmits power to the planet carrier 31, which then rotates, thereby driving the second sun gear 32 to rotate. The second sun gear 32 transmits power to the second planetary gear train 2, thus completing the deceleration.

[0031] In the specific implementation process of this embodiment 1, such as Figure 1 As shown, the first planetary gear train 1 includes a first sun gear 11, a first planet gear 12, and a first ring gear 13. The first sun gear 11 is connected to the output shaft of the motor assembly in the hub motor. The first sun gear 11 meshes with the first planet gear 12. The first planet gear 12 is located on one side of the frame 3. The first planet gear 12 meshes with the first ring gear 13. The first ring gear 13 is fixedly connected to the motor assembly in the hub motor.

[0032] More specifically, the output shaft of the motor assembly in the hub motor transmits power to the first sun gear 11. When the first sun gear 11 rotates, since the first gear ring 13 is fixedly connected to the motor assembly in the hub motor, the first gear ring 13 is in a locked state. Therefore, the first sun gear 11 meshes with the first planet gear 12, driving the first planet gear 12 to perform circumferential motion. The first planet gear 12 drives the planet carrier 31 to rotate.

[0033] Furthermore, the first planetary gear 12 is made of high-strength non-metallic materials such as nylon, resin, or plastic, which reduces noise and weight during operation.

[0034] In the specific implementation process of this embodiment 1, such as Figure 2 As shown, the second planetary gear train 2 includes a second planetary gear 21 and a second ring gear 22. The second planetary gear 21 is located on the other side of the frame 3. The second sun gear 32 meshes with the second planetary gear 21. The second planetary gear 21 meshes with the second ring gear 22. The second ring gear 22 is connected to the one-way clutch in the hub motor.

[0035] More specifically, the first planetary gear 12 drives the planet carrier 31 to rotate, the second sun gear 32 on the planet carrier 31 rotates, driving the second planetary gear 21 to rotate, and then the second ring gear 22 rotates. The second ring gear 22 is connected to the one-way clutch, and the second ring gear 22 transmits power to the one-way clutch.

[0036] Furthermore, the first gear ring 13, the second planetary gear train 2, and the frame 3 are all made of metal to ensure that they can withstand high-strength torque.

[0037] In the specific implementation process of this embodiment 1, such as Figure 4 As shown, fixed shafts 33 are provided on both sides of the frame 3, and the first planetary gear 12 and the second planetary gear 21 are provided on the fixed shafts 33.

[0038] More specifically, the planet carrier 31 may be provided with holes, and the fixed shaft 33 is provided on the planet carrier 31 through the holes. The fixed shaft 33 may also be provided on the planet carrier 31 by bolts, screws or other means.

[0039] In the specific implementation process of this embodiment 1, such as Figure 4 As shown, both the first planetary gear 12 and the second planetary gear 21 are connected to the fixed shaft 33 via bearings.

[0040] More specifically, both the first planetary gear 12 and the second planetary gear 21 are connected to the fixed shaft 33 via bearings. A radial bearing is provided between the first planetary gear 12 and the second planetary gear 21, and thrust bearings are provided on the opposite end faces of the first planetary gear 12 and the second planetary gear 21. During the relative movement of the first planetary gear 12 and the second planetary gear 21, the friction between the end faces is reduced, noise is reduced, and service life is increased. The radial bearing is located in the middle of the two thrust bearings, so that the planetary carrier 31 maintains a stable relative movement with the first planetary gear 12 and the second planetary gear 21, thereby improving the stability and safety of the reducer.

[0041] In the specific implementation process of this embodiment 1, such as Figure 1 and Figure 2 As shown, both the first planetary gear 12 and the second planetary gear 21 are configured as multiple.

[0042] In the specific implementation process of this embodiment 1, such as Figure 1 and Figure 2 As shown, the number of the second planetary gears 21 is greater than the number of the first planetary gears 12.

[0043] More specifically, because the number of first planetary gears 12 and second planetary gears 21 on both sides of the planetary carrier 31 is different, the force undergoes two stages of deceleration during transmission, thus completing the speed reduction.

[0044] In the specific implementation process of this embodiment 1, such as Figure 1 As shown, the first gear ring 13 has a first protrusion 131 on its end face facing the motor assembly in the hub motor, and the first gear ring 13 is fixedly connected to the motor assembly in the hub motor through the first protrusion 131.

[0045] More specifically, the first gear ring 13 is fixedly connected to the motor assembly in the hub motor via the first protrusion 131, so that the first gear ring 13 is fixed and locked.

[0046] Furthermore, the first protrusion 131 is evenly distributed on the first gear ring 13. When the first gear ring 13 is connected to the motor assembly in the hub motor through the first protrusion 131, it can serve the purpose of stopping and centering.

[0047] In the specific implementation process of this embodiment 1, such as Figure 2 As shown, the second gear ring 22 has a second protrusion 221 on its end face away from the first planetary gear train 1, and the second gear ring 22 is connected to the one-way clutch through the second protrusion 221.

[0048] More specifically, the second protrusion 221 is evenly distributed on the end face of the second gear ring 22. The setting of the second protrusion 221 facilitates contact with the next stage structure. The second gear ring 22 transmits torque to the one-way clutch. At the same time, the setting of the second protrusion 221 is conducive to rapid assembly.

[0049] The workflow provided in Embodiment 1 of this utility model is as follows: The output shaft of the motor assembly in the hub motor transmits power to the first sun gear 11. The first sun gear 11 rotates. Since the first ring gear 13 is fixedly connected to the motor assembly in the hub motor, the first ring gear 13 is in a locked state. Therefore, the first sun gear 11 meshes with the first planet gear 12, driving the first planet gear 12 to perform circumferential motion, completing the first stage of deceleration. The first planet gear 12 drives the planet carrier 31 to rotate. The second sun gear 32 on the planet carrier 31 rotates, driving the second planet gear 21 to rotate, and then the second ring gear 22 rotates. The second tooth end 22 is connected to the one-way clutch, thus completing the second stage of deceleration. The second ring gear 22 transmits power to the one-way clutch.

[0050] Example 2

[0051] In the specific implementation of this embodiment 2, a hub motor includes a motor assembly in the hub motor, a reducer as described in embodiment 1, and a one-way clutch in the hub motor. The motor assembly in the hub motor is connected to the reducer, and the reducer is connected to the one-way clutch in the hub motor.

[0052] More specifically, the motor assembly in the hub motor transmits force to the reducer for deceleration, and the reducer transmits torque to the one-way clutch. The hub motor using this reducer has the characteristics of simple structure and light weight.

[0053] In summary, when the reducer of this utility model is used, it is placed in the hub motor. The motor assembly in the hub motor transmits power to the first planetary gear train 1 for first-stage reduction, and the frame 3 transmits the power after first-stage reduction to the second planetary gear train 2 for second-stage reduction. The reducer improves the reduction ratio through two-stage reduction, which increases its adaptability when applied to hub motors.

[0054] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A speed reducer, characterized in that, The invention is applied to a hub motor and includes a first planetary gear train (1), a second planetary gear train (2) and a frame (3). The frame (3) includes a planet carrier (31) and a second sun gear (32) located in the middle of the planet carrier (31). The second planetary gear train (2) includes a second planetary gear (21) and a second ring gear (22). One end of the first planetary gear train (1) is connected to the motor assembly in the hub motor, and the other end of the first planetary gear train (1) is movably connected to one side of the planet carrier (31). The second sun gear (32) on the other side of the planet carrier (31) meshes with the second planet gear (21), the second planet gear (21) meshes with the second ring gear (22), and the second ring gear (22) is connected to the one-way clutch in the hub motor. In use, the motor assembly in the hub motor transmits power to the first planetary gear train (1) for first-stage deceleration, and the frame (3) transmits the power after first-stage deceleration to the second planetary gear train (2) for second-stage deceleration.

2. The reducer according to claim 1, characterized in that, The first planetary gear train (1) includes a first sun gear (11), a first planet gear (12) and a first ring gear (13). The first sun gear (11) is connected to the output shaft of the motor assembly in the hub motor. The first sun gear (11) meshes with the first planet gear (12). The first planet gear (12) is located on one side of the planet carrier (31). The first planet gear (12) meshes with the first ring gear (13). The first ring gear (13) is fixedly connected to the motor assembly in the hub motor.

3. The reducer according to claim 2, characterized in that, The frame (3) has fixed shafts (33) on both sides, and the first planetary gear (12) and the second planetary gear (21) are mounted on the fixed shafts (33).

4. The reducer according to claim 3, characterized in that, Both the first planetary gear (12) and the second planetary gear (21) are configured as multiple; the number of the second planetary gear (21) is greater than the number of the first planetary gear (12).

5. The reducer according to claim 3, characterized in that, The first planetary gear (12) and the second planetary gear (21) are both connected to the fixed shaft (33) via bearings.

6. The reducer according to any one of claims 2-5, characterized in that, The first gear ring (13) has a first protrusion (131) on the end face facing the motor assembly in the hub motor, and the first gear ring (13) is fixedly connected to the motor assembly in the hub motor through the first protrusion (131); the second gear ring (22) has a second protrusion (221) on the end face away from the first planetary gear train (1), and the second gear ring (22) is connected to the one-way clutch through the second protrusion (221).

7. A hub motor, characterized in that, The device includes a motor assembly in the hub motor, a one-way clutch in the hub motor, and a reducer as described in any one of claims 1-6, wherein the motor assembly in the hub motor is connected to the reducer, and the reducer is connected to the one-way clutch in the hub motor.

Images