Combined type speed reduction driving mechanism

Abstract

The invention relates to a combined type speed reduction driving mechanism which is used in a power system of an electric vehicle and connected between an electric motor and a wheel shaft of the power system, the combined type speed reduction driving mechanism comprises a speed reduction gear set and a transmission belt set, and the speed reduction gear set is connected with a driving shaft of the electric motor and drives a driven shaft and the wheel shaft which are connected with the speed reduction gear set in a transmission mode. Through the combined type driving mechanism combining the reduction gear set and the transmission belt set, the power output by the electric motor is subjected to two times of reduction transmission of the combined type reduction driving mechanism, and the power performance of high torsion is provided for the axle.

Description

Technical Field

[0001] The present invention relates to a power system of an electric vehicle, in particular to a composite reduction drive mechanism used in the power system of the electric vehicle and connected between an electric motor and a wheel shaft to transmit high torque power performance. Background Art

[0002] The electric power system of current electric vehicles mainly utilizes an electric motor in combination with a transmission mechanism or a reduction mechanism to connect the wheel axle, so that the output power of the electric motor can drive the wheel axle of the electric vehicle directly or after reduction.

[0003] In the aforementioned electric power system, the electric motor directly drives the axle through a transmission mechanism or drives the axle after a single deceleration through a reduction mechanism. When the electric motor outputs torsional power to the wheel located at the side end of the axle, the problem of insufficient torque is prone to occur. In particular, all-terrain electric vehicles need to cope with different terrains and require high-torque driving performance. With the aforementioned existing direct drive or single-deceleration drive mechanism outputting torque, it is difficult for all-terrain electric vehicles to travel on a steep uphill section. Therefore, based on the existing electric motor output power, how to improve the torque capacity of the electric power system is an important issue that the current electric power system wants to solve. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a composite reduction drive mechanism to solve the problem of insufficient torque performance that can be generated by the reduction drive mechanism connected between the electric motor and the wheel axle when transmitting power in the electric power system of the existing electric vehicle.

[0005] The technical solution proposed by the present invention is to provide a compound reduction drive mechanism, which is used in an electric power system of an electric vehicle and connected between a drive shaft of an electric motor of the electric power system and a wheel axle, and the compound reduction drive mechanism includes:

[0006] a reduction gear set, comprising a first reduction gear pair and a second reduction gear pair linked with the first reduction gear pair, the first reduction gear pair being connected to the driving shaft of the electric motor, and the second reduction gear pair having a driven shaft; and

[0007] A transmission belt set is connected between the reduction gear set and the axle, and the transmission belt set includes a first transmission wheel, a second transmission wheel and an annular transmission belt. The first transmission wheel is arranged on the driven shaft, the second transmission wheel is arranged on the axle, and the annular transmission belt is wound around and connected between the first transmission wheel and the second transmission wheel.

[0008] In the compound reduction drive mechanism as described above, the first reduction gear pair includes a driving gear, an intermediate shaft and a first intermediate gear, the driving gear is connected to the driving shaft of the electric motor, the intermediate shaft is arranged in the vehicle body, the intermediate shaft is parallel to and adjacent to the driving shaft, the first intermediate gear is arranged on the intermediate shaft and meshes with the driving gear; the second reduction gear pair includes a second intermediate gear, a driven shaft and a terminal gear, the second intermediate gear is arranged on the intermediate shaft, the second intermediate gear is coaxially linked with the first intermediate gear, the driven shaft is arranged in the vehicle body, the driven shaft is parallel to and adjacent to the intermediate shaft, the terminal gear is arranged on the driven shaft and meshes with the second intermediate gear.

[0009] In the compound reduction drive mechanism as described above, the first intermediate gear has more teeth than the driving gear, the second intermediate gear has less teeth than the first intermediate gear, and the terminal gear has more teeth than the second intermediate gear.

[0010] In the compound reduction drive mechanism as described above, the first transmission wheel and the second transmission wheel are both sprocket wheels, and the annular transmission belt is an annular chain.

[0011] In the compound reduction drive mechanism as described above, the first transmission wheel and the second transmission wheel are both pulleys, and the annular transmission belt is an annular belt.

[0012] In the compound reduction drive mechanism as described above, a first protective cover is sleeved on the outer side of the reduction gear set.

[0013] In the compound reduction drive mechanism as described above, a second protective cover is sleeved on the outer side of the second transmission wheel which is assembled on the wheel shaft and around which the annular transmission belt is wound.

[0014] The beneficial effect that can be achieved by the present invention is that the compound reduction drive mechanism can be applied to the power system of an electric vehicle and connected between the electric motor and the wheel axle of the power system. The compound reduction drive mechanism is combined with a reduction gear set and a transmission belt set, the reduction gear set is connected to the driving shaft of the electric motor, and the transmission drive set is connected to the driven shaft of the reduction gear set and the wheel axle, so that the power output by the electric motor is transmitted through two reductions of the compound reduction drive mechanism, providing high torque power performance to the wheel axle.

[0015] The compound reduction drive mechanism of the present invention can further utilize the reduction gear set including the linked first reduction gear pair and the second reduction gear pair, and achieve stable and high-torque reduction transmission performance through the staged progressive reduction structure of the two reduction gear pairs of the reduction gear set. Furthermore, the compound reduction drive mechanism of the present invention can also utilize the transmission belt set to connect the driven shaft and the wheel axle of the transmission drive set to the reduction gear set, which is helpful for the spatial configuration of the electric power system in the vehicle body.

[0016] The composite reduction drive mechanism of the present invention can further utilize a transmission belt group that selects a mechanism combining a sprocket and an annular chain, so that the transmission belt group can produce a buffering effect between the reduction gear group connected to the electric motor and the wheel axle during the load change of the electric vehicle, thereby improving the driving performance of the electric power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a partial three-dimensional schematic diagram of an embodiment of the compound reduction drive mechanism of the present invention applied to an electric vehicle.

[0018] Figure 2 yes Figure 1 The illustrated embodiment of the composite deceleration drive mechanism is a partial top plan view of a moving second protective cover in an electric vehicle.

[0019] Figure 3 yes Figure 1 The illustrated embodiment of the compound reduction drive mechanism is a partial side plan view schematic diagram of application in an electric vehicle.

[0020] Figure 4 yes Figure 2 The illustrated embodiment of the compound reduction drive mechanism is applied to an electric vehicle and is a partial top view schematic diagram after the first protective cover and the second protective cover are removed.

[0021] Figure 5 yes Figure 3 The illustrated embodiment of the composite deceleration drive mechanism is a partial top plan view schematic diagram of an electric vehicle after being applied thereto and after the first protective cover is removed.

[0022] Figure 6 yes Figures 1 to 5 The schematic three-dimensional diagram of the reduction gear set connected to the electric motor in the embodiment of the compound reduction drive mechanism shown.

[0023] Figure 7 yes Figure 6 Schematic diagram of local three-dimensional decomposition.

[0024] Description of reference numerals:

[0025] A: Car body

[0026] B: Electric powertrain

[0027] C: Axle

[0028] 1: Electric Motor

[0029] 10: Drive shaft

[0030] 2: Compound reduction drive mechanism

[0031] 20: Reduction gear set

[0032] 21: First reduction gear pair

[0033] 211: Driving gear

[0034] 212:Intermediate shaft

[0035] 213: First intermediate gear

[0036] 22: Second reduction gear pair

[0037] 221: Second intermediate gear

[0038] 222: Driven shaft

[0039] 223:Terminal gear

[0040] 30: Transmission belt set

[0041] 31: First transmission wheel

[0042] 32: Second transmission wheel

[0043] 33: Endless transmission belt

[0044] 40: First protective cover

[0045] 50: Second protective cover. DETAILED DESCRIPTION

[0046] The following is a further description of the technical means adopted by the present invention to achieve the predetermined purpose of the invention with reference to the accompanying drawings and embodiments of the present invention.

[0047] like Figures 1 to 5 As shown, it discloses an embodiment of the composite reduction drive mechanism 2 of the present invention applied to an electric vehicle. As can be seen from the accompanying drawings, the composite reduction drive mechanism 2 is used for the electric power system B of the electric vehicle and is installed in the body A of the electric vehicle. The composite reduction drive mechanism 2 is connected between the drive shaft 10 of the electric motor 1 of the electric power system B and the wheel axle C of the electric vehicle to transmit the power output by the electric motor 1 to the wheel axle C.

[0048] like Figures 1 to 5 As shown, the compound reduction drive mechanism 2 includes a reduction gear set 20 and a transmission belt set 30 , and the reduction gear set 20 is connected to the driving shaft 10 of the electric motor 1 , and the transmission belt set 30 is connected to the reduction gear set 20 and the wheel axle C.

[0049] like Figures 4 to 7As shown, the reduction gear set 20 includes a first reduction gear pair 21 and a second reduction gear pair 22. The first reduction gear pair 21 is connected to the driving shaft 10 of the electric motor 1, and the second reduction gear pair 22 is linked to the first reduction gear pair 21. The second reduction gear pair 22 has a driven shaft 222 and is connected to the transmission belt set 30 via the driven shaft 222.

[0050] like Figures 4 to 7 As shown, in this embodiment, the first reduction gear pair 21 includes a driving gear 211, an intermediate shaft 212 and a first intermediate gear 213. The driving gear 211 is connected to the driving shaft 10 of the electric motor 1. The intermediate shaft 212 is arranged in the vehicle body A. The intermediate shaft 212 is parallel to and adjacent to the driving shaft 10. The first intermediate gear 213 is arranged on the intermediate shaft 212 and meshes with the driving gear 211.

[0051] like Figures 4 to 7 As shown, the second reduction gear pair 22 includes a second intermediate gear 221, a driven shaft 222 and a terminal gear 223. The second intermediate gear 221 is arranged on the intermediate shaft 212, and the second intermediate gear 221 is coaxially linked with the first intermediate gear 213. The driven shaft 222 is arranged in the vehicle body A, and the driven shaft 222 is parallel to and adjacent to the intermediate shaft 212. The terminal gear 223 is arranged on the driven shaft 222 and meshes with the second intermediate gear 221.

[0052] like Figures 4 to 7 As shown, the gear ratio of the driving gear 211 and the first intermediate gear 213 in the first reduction gear pair 21, and the gear ratio of the terminal gear 223 and the second intermediate gear 221 in the second reduction gear pair 22 are set according to actual driving performance requirements. In this embodiment, the number of teeth of the first intermediate gear 213 is greater than the number of teeth of the driving gear 211, the number of teeth of the second intermediate gear 221 is less than the number of teeth of the first intermediate gear 213, and the number of teeth of the terminal gear 223 is greater than the number of teeth of the second intermediate gear 221. Through the staged progressive reduction structure of the two groups of reduction gear pairs of the reduction gear set 20, a stable reduction transmission performance with high torque is achieved.

[0053] like Figures 1 to 5As shown, the transmission belt set 30 can be installed in the vehicle body A and connected between the driven shaft 222 of the reduction gear set 20 and the wheel axle C. The transmission belt set 30 includes a first transmission wheel 31, a second transmission wheel 32 and an annular transmission belt 33. The first transmission wheel 31 is arranged on the driven shaft 222 and is coaxially linked with the terminal gear 223. The second transmission wheel 32 is arranged on the wheel axle C. The annular transmission belt 33 is wound and connected between the first transmission wheel 31 and the second transmission wheel 32. The diameter of the first transmission wheel 31 is smaller than the diameter of the second transmission wheel 32, so that it has a deceleration performance between the driven shaft 222 and the wheel axle C. The transmission belt set 30 can be a chain-type or belt-type transmission belt set. When the transmission belt set 30 is a chain-type transmission belt set, the first transmission wheel 31 and the second transmission wheel 32 are sprocket wheels, and the endless transmission belt 33 is an endless chain; when the transmission belt set 30 is a belt-type transmission belt set, the first transmission wheel 31 and the second transmission wheel 32 are pulleys, and the endless transmission belt 33 is an endless belt. In this embodiment, the transmission belt set 30 is disclosed as a chain-type transmission belt set, but it is not limited thereto. The type of the transmission belt set 30 is selected according to the actual driving performance requirements.

[0054] like Figures 1 to 3 As shown, the composite reduction drive mechanism of the present invention may further include a first protective cover 40 and a second protective cover 50. The first protective cover 40 is sleeved on the outer side of the reduction gear set 20 to provide a protection function for the reduction gear set 20, preventing foreign matter from entering the reduction gear set 20 and affecting its transmission performance. The first protective cover 40 can be assembled on the electric motor 1. The second protective cover 50 can be sleeved on the outer side of the second transmission wheel 32 assembled on the wheel shaft C and wound around the annular transmission belt 33 to provide a protection function for the transmission belt set 30. The second protective cover 50 can be installed in the vehicle body A.

[0055] When the composite reduction drive mechanism of the present invention can be applied to the power system of an electric vehicle, the composite reduction drive mechanism is a combination structure of a reduction gear set and a transmission belt set, and the reduction gear set is connected to the driving shaft of the electric motor, and the transmission drive set is connected to the driven shaft of the reduction gear set and the wheel axle, thereby, the power output by the electric motor is transmitted through two reductions of the composite reduction drive mechanism, providing high torque power performance to the wheel axle. Moreover, when the transmission belt set uses a mechanism combining a sprocket and an annular chain, the transmission belt set can provide a buffering effect between the reduction gear set connected to the electric motor and the wheel axle during the load change of the electric vehicle, thereby improving the driving performance of the electric power system.

[0056] The above description is only an embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as above by the embodiment, it is not used to limit the present invention. Any technician in the field can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A compound reduction drive mechanism, which is used in an electric power system of an electric vehicle and connected between a drive shaft of an electric motor of the electric power system and a wheel axle, characterized in that: The compound reduction drive mechanism comprises: a reduction gear set, comprising a first reduction gear pair and a second reduction gear pair linked with the first reduction gear pair, the first reduction gear pair being connected to the driving shaft of the electric motor, and the second reduction gear pair having a driven shaft; and A transmission belt set is connected between the reduction gear set and the axle, and the transmission belt set includes a first transmission wheel, a second transmission wheel and an annular transmission belt. The first transmission wheel is arranged on the driven shaft, the second transmission wheel is arranged on the axle, and the annular transmission belt is wound around and connected between the first transmission wheel and the second transmission wheel.

2. The compound reduction drive mechanism according to claim 1, characterized in that: The first reduction gear pair includes a driving gear, an intermediate shaft and a first intermediate gear, the driving gear is connected to the driving shaft of the electric motor, the intermediate shaft is arranged in the vehicle body, the intermediate shaft is parallel to and adjacent to the driving shaft, and the first intermediate gear is arranged on the intermediate shaft and meshes with the driving gear; The second reduction gear pair includes a second intermediate gear, a driven shaft and a terminal gear. The second intermediate gear is arranged on the intermediate shaft. The second intermediate gear is coaxially linked with the first intermediate gear. The driven shaft is arranged in the vehicle body. The driven shaft is parallel to and adjacent to the intermediate shaft. The terminal gear is arranged on the driven shaft and meshes with the second intermediate gear.

3. The compound reduction drive mechanism according to claim 2, characterized in that: The number of teeth of the first intermediate gear is greater than that of the driving gear, the number of teeth of the second intermediate gear is less than that of the first intermediate gear, and the number of teeth of the terminal gear is greater than that of the second intermediate gear.

4. The compound reduction drive mechanism according to any one of claims 1 to 3, characterized in that: The first transmission wheel and the second transmission wheel are both sprocket wheels, and the annular transmission belt is an annular chain.

5. The compound reduction drive mechanism according to any one of claims 1 to 3, characterized in that: The first transmission wheel and the second transmission wheel are both belt pulleys, and the annular transmission belt is an annular belt.

6. The compound reduction drive mechanism according to any one of claims 1 to 3, characterized in that: A first protective cover is sleeved on the outer side of the reduction gear set.

7. The compound reduction drive mechanism according to any one of claims 1 to 3, characterized in that: A second protective cover is sleeved on the outer side of a second transmission wheel which is assembled on the wheel shaft and wound around the annular transmission belt.

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