CN110949119B - Central driving type electric driving system assembly - Google Patents

Abstract

The invention discloses a central driving type electric driving system assembly which comprises a rotary output part and a transmission shaft penetrating through the rotary output part, wherein a power system and a speed changing system are arranged on the transmission shaft, the power system and the speed changing system are respectively positioned on two sides of the rotary output part, the power system transmits power to the speed changing system through the transmission shaft, and the speed changing system drives the rotary output part to rotate to output power. By adopting the technical scheme, the novel central driving type structure has the advantages of the hub motor and the side hanging type structure, overcomes the defects of the hub motor and the side hanging type structure, is particularly suitable for a two-wheel vehicle, can well ensure the balance of the rotating output part, and has extremely high mechanical efficiency, small heating value, better heat dissipation capacity and lighter weight.

Description

Central drive electric drive system assembly

Technical field

The invention relates to the technical field of electric drive systems, and in particular to a central drive electric drive system assembly.

Background technique

As environmental protection regulations become increasingly stringent, it has become a general trend for new energy vehicles, represented by pure electric-powered cars, two-wheelers, and three-wheelers, to replace traditional fuel-powered vehicles. Existing two-wheeled electric vehicles generally use in-wheel motors and motor side-mounted structures.

The wheel hub motor is directly driven by a low-speed DC motor, which not only has relatively low efficiency and generates a lot of heat, but also breaks the original balance of the wheel structure due to the large size and heavy weight of the motor, which will have a certain impact on the control performance and safety.

The side-mounted structure places the motor and transmission system (gearbox or reducer) on the same side of the driving wheel. Although high-speed motors can be used to improve mechanical efficiency, the weight of the transmission mechanism and motor is heavier, resulting in poor wheel balance. Good, especially the impact on two-wheeled vehicles is more obvious.

Therefore, there is an urgent need to design a new electric drive system that can combine the advantages of in-wheel motors and motor side-mounted structures and make up for the shortcomings of both.

Contents of the invention

In order to solve the above technical problems, the present invention provides a central drive electric drive system assembly.

The technical solution is as follows:

A centrally driven electric drive system assembly includes a rotating output component and a transmission shaft that is passed through the rotating output component. The main point is that a power system and a transmission system are installed on the transmission shaft, and the power system and the transmission shaft are installed on the transmission shaft. The transmission system is located on both sides of the rotating output component. The power system transmits power to the transmission system through the transmission shaft, and then the transmission system drives the rotational output component to rotate and output power.

Adopting a newly designed central drive structure, the power system and transmission system are relatively symmetrically arranged on both sides of the rotating output component, which not only ensures the balance of the rotating output component, but also overcomes the poor balance caused by the traditional side-mounted structure. problem, especially suitable for two-wheeled vehicles, and can use high-speed motors, which have higher mechanical efficiency, smaller heat generation, better heat dissipation capabilities and lighter weight than traditional wheel hub motors.

Preferably, the power system includes a motor that is mounted on the transmission shaft and used to drive the transmission shaft to rotate, and a power system box wrapped outside the motor. The motor and the power system box are fixed to the transmission shaft through a power system locking component. superior;

The transmission system includes a transmission mechanism for variable speed transmission between a transmission shaft and a rotational output component, and a transmission system case wrapped outside the transmission mechanism. The transmission mechanism and the transmission system case are fixed on the transmission shaft through a transmission system locking component. .

With the above structure, the power system and the transmission system are independent structures, which can not only carry out modular design, but also facilitate separate installation and maintenance, and also facilitate the disassembly and installation of rotating output components.

Preferably: the power system box includes a power box base for accommodating the motor and a power box cover that can be closed on the power box base; the transmission system box includes a gearbox for accommodating the transmission mechanism The base and the gearbox case cover that is closed on the gearbox base;

After the power box base and the motor are installed on the transmission shaft in sequence, they are first locked by the power system locking component, then the power box cover is closed on the power box base, and then the first end cover of the transmission shaft is closed on the power box. cover the box;

After the transmission base, transmission mechanism and transmission case cover are installed on the transmission shaft in sequence, they are first locked by the transmission system locking component, and then the second end cover of the transmission shaft is closed on the transmission case cover.

The above structure is simple, reliable, and easy to disassemble and assemble.

Preferably: the power system locking component and the transmission system locking component are both half-moon keys, and the transmission shaft has a half-moon key installation groove that is adapted to the corresponding half-moon key. The above structure is simple, reliable and low cost.

Preferably: it also includes a flat fork, the two main tubes of which are fixedly connected to the power box base and the gearbox base respectively. Using the above structure, the overall structure is stable and reliable, and the impact on the motor and transmission mechanism is avoided as much as possible.

Preferably, the transmission mechanism includes a first-level driving gear fixedly sleeved on the transmission shaft, a reduction intermediate shaft parallel to the transmission shaft, a first-level driven gear fixedly sleeved on the reduction intermediate shaft, and a first-level driven gear sleeved loosely on the transmission shaft. The hub drive sleeve and the secondary driven gear fixedly sleeved on the hub drive sleeve. The primary driving gear meshes with the primary driven gear. The reduction intermediate shaft has a secondary driven gear meshing with the secondary driven gear. teeth, the hub drive sleeve can drive the rotating output component to rotate synchronously. Using the above structure, reduction transmission can be carried out stably and reliably.

Preferably: a thrust ball bearing is provided between the hub drive sleeve and the primary driving gear. The above structure ensures the reliability of the installation of the hub drive sleeve and the primary driving gear.

Preferably: the hub drive sleeve has a first step surface and a second step surface, the protruding height of the first step surface is higher than the second step surface, and the rotation output component is sleeved on the first step surface, And it is splined with the first-level step surface, and the second-level driven gear is set on the second-level step surface, and is splined with the second-level step surface. Adopting the above structure, it is easy to assemble and has high reliability.

Preferably: the motor shaft of the motor has a hollow sleeve structure, and the motor shaft is sleeved on the transmission shaft and splined with the transmission shaft. The above structure ensures the coaxiality of the motor shaft and the transmission shaft, can withstand greater torque, and has a stable and reliable structure.

Preferably: an encoder is installed on the transmission shaft, and the encoder is located between the first end cover of the transmission shaft and the power box cover. Using the above structure, the rotation speed of the motor and the transmission shaft can be converted into a signal form for feedback.

Compared with the existing technology, the beneficial effects of the present invention are:

The central drive electric drive system assembly using the above technical solution has a novel structure, ingenious design, and is easy to implement. Through the newly designed central drive structure, it combines the advantages of the wheel hub motor and the side-mounted structure, making up for the in-wheel motor and the side-mounted structure. The shortcomings of the side-mounted structure, especially suitable for two-wheeled vehicles, can not only ensure the balance of the rotating output components, but also have extremely high mechanical efficiency, smaller heat generation, better heat dissipation capacity and lighter weight. weight.

Description of the drawings

Figure 1 is a cross-sectional view of the central drive electric drive system assembly;

Figure 2 is a schematic diagram of the cooperation relationship between the motor, transmission shaft and transmission mechanism;

Figure 3 is a schematic structural diagram of the central drive electric drive system assembly;

Figure 4 is a schematic structural diagram of the combined wheel;

Figure 5 is a cross-sectional view of the combined wheel;

Figure 6 is a schematic diagram of the wheel hub bracket from one perspective;

Figure 7 is a schematic diagram of the wheel hub bracket from another perspective;

Figure 8 is a schematic diagram of the wheel hub from one perspective;

Figure 9 is a schematic diagram of the wheel hub from another perspective.

Detailed ways

The present invention will be further described below in conjunction with the examples and drawings.

As shown in Figures 1 and 3, a centrally driven electric drive system assembly mainly includes a rotating output component 1 and a transmission shaft 2 that passes through the rotating output component 1. The transmission shaft 2 is equipped with a Power system and transmission system. The power system and the transmission system are respectively located on both sides of the rotating output component 1. The power system transmits power to the transmission system through the transmission shaft 2, and then the transmission system drives the rotation output component 1 to output power. .

The newly designed central drive structure combines the advantages of in-wheel motors and side-mounted structures, making up for the shortcomings of in-wheel motors and side-mounted structures. It is especially suitable for two-wheeled vehicles, and can not only ensure the rotation of the output components well balance, and has extremely high mechanical efficiency, smaller heat generation, better heat dissipation capacity and lighter weight.

In this embodiment, the rotation output component 1 is a combined wheel. Referring to Figures 4 and 5, the combined wheel includes a hub bracket 1a, a wheel hub 1b and a tire 1c arranged coaxially in sequence from the inside to the outside. The transmission system drives the wheel hub bracket 1a to drive the combined wheel to rotate. The hub 1b is a hollow structure, and the hub 1b is detachably mounted on the hub bracket 1a. The tire 1c is mounted on the wheel hub 1b.

Please refer to Figures 4 to 9. The outer ring of the hub bracket 1a has a hub mounting ring 1a1, and the inner ring of the hub 1b has a hub mounting ring 1b1 that is adapted to the hub mounting ring 1a1. The hub mounting ring 1b1 can It is detachably fixed on the hub mounting ring 1a1 through a number of bolts 1d. The power system and transmission system of the centrally driven electric drive system assembly are installed on both sides of the wheel hub bracket 1a. When the tire 1c needs to be replaced or repaired, all bolts 1d need to be removed (no need to disassemble the power system and transmission system). The wheel hub 1b and tire 1c can be removed together in exactly the same way as in the traditional method, thereby enabling quick tire replacement and improving the convenience of maintenance of the centrally driven electric drive system assembly.

Please refer to Figures 6 and 7. The hub bracket 1a also includes a power input disk 1a2 coaxially arranged in the hub mounting ring 1a1. The hub mounting ring 1a1 and the power input disk 1a2 are connected through a number of bracket connecting ribs 1a3. , with high structural strength, stability and reliability, and light weight, which can achieve the purpose of weight reduction.

There is a drive shaft hole 1a21 at the center of the power input disk 1a2. The hole wall of the drive shaft hole 1a21 is a spline structure, which enables stable and reliable power transmission.

A cavity 1a22 is formed on one side of the power input disk 1a2. A power input sleeve 1a23 is provided at the center of the cavity 1a22. The shaft hole of the power input sleeve 1a23 is the drive shaft hole 1a21. The power input bushing 1a23 is basically hidden in the cavity 1a22, improving the overall appearance.

A number of reinforcing ribs 1a24 are provided in the cavity 1a22. Each reinforcing rib 1a24 is distributed circumferentially around the power input shaft sleeve 1a23, and the two ends of each reinforcing rib 1a24 are respectively connected with the cavity wall and the power input shaft of the cavity 1a22. The outer wall connection of the input shaft sleeve 1a23 can greatly improve the structural strength of the power input disk 1a2 and the power input shaft sleeve 1a23. A circular annular flange 1a25 is formed on the side of the power input disk 1a2 opposite to the cavity 1a22. A number of reinforcing bumps 1a26 are provided on the outer circumferential surface of the flange 1a25 to ensure the stability of the flange 1a25. Structural strength.

Please refer to Figures 8 and 9. The wheel hub 1b also includes a tire mounting ring 1b2 coaxially arranged outside the wheel hub mounting ring 1b1. The tire mounting ring 1b2 and the hub mounting ring 1b1 are connected by a number of hub connecting ribs 1b3. The structure is high in strength, stable and reliable, and light in weight, enabling weight reduction. Moreover, one side surface of the hub connecting rib 1b3 has a weight-reducing groove 1b31, which realizes the weight-reducing function while ensuring the structural strength. The side surface of the hub mounting ring 1b1 on which the hub mounting ring 1a1 is mounted has a mounting sink 1b11 that is adapted to the hub mounting ring 1a1. The mounting sink 1b11 can not only position the hub mounting ring 1a1, improve assembly efficiency, but also improve the wheel hub. Reliability of the connection between bracket 1a and hub 1b.

Furthermore, in order to improve the reliability of the hub bracket 1a and the hub 1b, the hub bracket 1a and the hub 1b are both integrally formed.

Please refer to Figures 1 and 2. The power system includes a motor 3 that is mounted on the transmission shaft 2 and used to drive the transmission shaft 2 to rotate, and a power system box 4 wrapped outside the motor 3. The motor 3 and the power system The box 4 is fixed on the transmission shaft 2 through the power system locking component 6 . The transmission system includes a transmission mechanism for variable transmission between the drive shaft 2 and the combined wheel, and a transmission system box 5 wrapped outside the transmission mechanism. The transmission mechanism and the transmission system case 5 are fixed by a transmission system locking component 7 on drive shaft 2. It should be pointed out that the size of the power system box 4 and the transmission system box 5 are both smaller than the inner ring size of the wheel hub mounting ring 1b1, so that the wheel hub bracket 1a and the wheel hub 1b can be disassembled to the left and right, which is flexible. High performance and suitable for different situations.

Please refer to Figure 1. The power system box 4 includes a power box base 4a for accommodating the motor 3 and a power box cover 4b that can be closed on the power box base 4a. The transmission system box 5 includes a It consists of a gearbox base 5a that accommodates the transmission mechanism and a gearbox case cover 5b that is closed on the gearbox base 5a. After the power box base 4a and the motor 3 are installed on the transmission shaft 2 in sequence, they are first locked by the power system locking component 6, then the power box cover 4b is closed on the power box base 4a, and then the transmission shaft is first The end cover 4c is closed on the power box cover 4b. After the transmission base 5a, the transmission mechanism and the transmission case cover 5b are installed on the transmission shaft 2 in sequence, they are first locked by the transmission system locking component 7, and then the second end cover 5c of the transmission shaft is closed on the transmission case cover. 5b on.

Referring to Figures 1 and 2, the power system locking component 6 and the transmission system locking component 7 are both half-moon keys, and the transmission shaft 2 has a half-moon key installation groove that is adapted to the corresponding half-moon key.

Referring to Figures 1 and 3, the central drive electric drive system assembly also includes a flat fork 8. The two main tubes of the flat fork 8 are fixedly connected to the power box base 4a and the gearbox base 5a respectively. When it is necessary to replace the tire 1c, first separate the flat fork 8 from other components.

Please refer to Figure 2. The transmission mechanism includes a primary driving gear 9 fixed on the transmission shaft 2, a reduction intermediate shaft 11 parallel to the transmission shaft 2, and a primary driven gear 10 fixed on the reduction intermediate shaft 11. , the hub drive sleeve 13 that is loosely sleeved on the transmission shaft 2 and the secondary driven gear 12 that is fixedly sleeved on the hub drive sleeve 13. The primary driving gear 9 meshes with the primary driven gear 10, and the deceleration intermediate The shaft 11 has a secondary driving tooth 11a meshing with the secondary driven gear 12. The hub drive sleeve 13 can drive the combined wheel to rotate synchronously. A thrust force is provided between the hub drive sleeve 13 and the primary drive gear 9. Ball bearings14.

The motor 3 drives the transmission shaft 2 to rotate, the transmission shaft 2 drives the primary driving gear 9 to rotate, the primary driving gear 9 drives the primary driven gear 10 to rotate, the primary driven gear 10 drives the reduction intermediate shaft 11 to rotate, the secondary driving gear 11a drives the secondary driven gear 12 to rotate, and the secondary driven gear 12 drives the hub drive sleeve 13 to rotate.

Please refer to Figure 2. The wheel hub drive sleeve 13 has a first step surface 13a and a second step surface 13b. The protruding height of the first step surface 13a is higher than the second step surface 13b. The combined wheel set The secondary driven gear 12 is mounted on the first step surface 13a and is spline-fitted with the first step surface 13a. The secondary driven gear 12 is set on the second step surface 13b and is spline-fitted with the second step surface 13b.

The motor shaft 3a of the motor 3 has a hollow sleeve structure. The motor shaft 3a is sleeved on the transmission shaft 2 and is splined with the transmission shaft 2. The rotor of the motor 3 drives the motor shaft 3a to rotate, and the motor shaft 3a drives the transmission shaft 2 to rotate synchronously with it.

Please refer to Figures 1 and 2. An encoder 17 is installed on the transmission shaft 2. The encoder 17 is located between the first end cover 4c of the transmission shaft and the power box cover 4b. It can connect the motor 3 and the transmission shaft 2. The speed is converted into a signal for feedback.

Please refer to Figure 1. A power box oil seal 15 is provided between the wheel hub drive sleeve 13 and the power system box 4. A gearbox oil seal 16 is provided between the wheel hub drive sleeve 13 and the transmission system box 5 to ensure power. The sealing performance of the system box 4 and the transmission system box 5 prevents oil leakage.

Finally, it should be noted that the above descriptions are only preferred embodiments of the present invention. Under the inspiration of the present invention, those of ordinary skill in the art can make a variety of similar embodiments without violating the purpose and claims of the present invention. It means that such transformations fall within the protection scope of the present invention.

Claims (1)

1. A centrally driven electric drive system assembly, which is characterized in that: it includes a rotational output component and a transmission shaft penetrated on the rotational output component, and a power system and a transmission system are installed on the transmission shaft. The power system and the transmission system are respectively located on both sides of the rotating output component. The power system transmits power to the transmission system through the transmission shaft, and then the transmission system drives the rotating output component to output power; The rotation output component is a combined wheel; the combined wheel includes a hub bracket, a wheel hub and a tire arranged coaxially from the inside to the outside; the transmission system drives the hub bracket to drive the combined wheel to rotate; the wheel hub is a hollow structure, The wheel hub is detachably installed on the wheel hub bracket; the tire is sleeved on the wheel hub; The outer ring of the hub bracket has a hub mounting ring, and the inner ring of the wheel hub has a hub mounting ring that is adapted to the hub mounting ring. The hub mounting ring can be detachably fixed on the hub mounting ring through a number of bolts; the center The power system and transmission system of the driven electric drive system assembly are installed on both sides of the wheel hub bracket; The wheel hub bracket also includes a power input disk coaxially arranged in the wheel hub mounting ring, and the wheel hub mounting ring and the power input disk are connected through a number of bracket connecting ribs; There is a drive shaft hole at the center of the power input disk, and the hole wall of the drive shaft hole is a spline structure; A cavity is formed inwardly on one side of the power input disk, and a power input sleeve is provided at the center of the cavity. The shaft hole of the power input sleeve is the drive shaft hole; A number of reinforcing ribs are provided in the cavity, each reinforcing rib is distributed circumferentially around the power input shaft sleeve, and the two ends of each reinforcing rib are connected to the cavity wall of the cavity and the outer wall of the power input sleeve respectively. ; The side of the power input disk opposite to the cavity protrudes to form a circular annular flange, and a number of reinforcing bumps are provided on the outer circumferential surface of the flange; The wheel hub also includes a tire mounting ring coaxially arranged outside the wheel hub mounting ring. The tire mounting ring and the wheel hub mounting ring are connected through a number of hub connecting ribs; one side surface of the wheel hub connecting ribs has a weight-reducing groove; The wheel hub mounting ring is installed on one side surface of the wheel hub mounting ring with a mounting sinking platform adapted to the wheel hub mounting ring; The wheel hub bracket and the wheel hub are both integrally formed; The power system includes a motor that is installed on the transmission shaft and used to drive the transmission shaft to rotate, and a power system box wrapped outside the motor. The motor and the power system box are fixed on the transmission shaft through a power system locking component; The transmission system includes a transmission mechanism for transmission between the transmission shaft and the combined wheel and a transmission system box wrapped outside the transmission mechanism. The transmission mechanism and the transmission system case are fixed on the transmission shaft through a transmission system locking component; The size of the power system box and the transmission system box are smaller than the inner ring size of the wheel hub mounting ring; The power system box includes a power box base for accommodating the motor and a power box cover that can be closed on the power box base. The transmission system box includes a gearbox base and a cover for accommodating the transmission mechanism. The gearbox cover is closed on the gearbox base; after the power box base and the motor are installed on the transmission shaft in sequence, they are first locked by the power system locking component, and then the power box cover is closed on the power box base. Then the first end cover of the transmission shaft is closed on the power box cover; after the transmission base, transmission mechanism and transmission case cover are installed on the transmission shaft in sequence, they are first locked by the transmission system locking component, and then the transmission is The second end cover of the shaft is closed on the gearbox case cover; The power system locking component and the transmission system locking component are both half-moon keys, and the transmission shaft has a half-moon key installation groove that is adapted to the corresponding half-moon key; The central drive electric drive system assembly also includes a flat fork, the two main tubes of which are fixedly connected to the power box base and the gearbox base respectively; The transmission mechanism includes a first-level driving gear fixedly sleeved on the transmission shaft, a reduction intermediate shaft parallel to the transmission shaft, a first-level driven gear fixedly sleeved on the reduction intermediate shaft, and a hub drive sleeve loosely sleeved on the transmission shaft. And a secondary driven gear fixedly sleeved on the hub drive sleeve, the primary driving gear meshes with the primary driven gear, the reduction intermediate shaft has a secondary driving gear meshing with the secondary driven gear, so The hub drive sleeve can drive the combined wheel to rotate synchronously, and a thrust ball bearing is provided between the hub drive sleeve and the primary driving gear; The motor drives the transmission shaft to rotate, the transmission shaft drives the primary driving gear to rotate, the primary driving gear drives the primary driven gear to rotate, the primary driven gear drives the reduction intermediate shaft to rotate, the secondary driving gear drives the secondary driven gear to rotate, The secondary driven gear drives the hub drive sleeve to rotate; The wheel hub drive sleeve has a first step surface and a second step surface. The protruding height of the first step surface is higher than the second step surface. The combined wheel is set on the first step surface and is connected with a first step surface. The step surface is splined, and the secondary driven gear is set on the secondary step surface and is splined with the secondary step surface; The motor shaft of the motor has a hollow sleeve structure, which is sleeved on the transmission shaft and splined with the transmission shaft; the rotor of the motor drives the motor shaft to rotate, and the motor shaft drives the transmission shaft to rotate synchronously with it; An encoder is installed on the transmission shaft. The encoder is located between the first end cover of the transmission shaft and the power box cover, and can convert the rotation speed of the motor and the transmission shaft into a signal form for feedback; A power box oil seal is provided between the wheel hub drive sleeve and the power system box, and a gearbox oil seal is provided between the wheel hub drive sleeve and the transmission system box.