WO2021135826A1

WO2021135826A1 - Central drive type electric drive system assembly

Info

Publication number: WO2021135826A1
Application number: PCT/CN2020/134045
Authority: WO
Inventors: 薛荣生; 张引航; 陈俊杰; 王靖; 陈同浩; 谭志康; 邓天仪; 邓云帆; 梁品权; 颜昌权
Original assignee: 西南大学
Priority date: 2019-12-31
Filing date: 2020-12-04
Publication date: 2021-07-08
Also published as: CN110949119A; CN110949119B

Abstract

A central drive type electric drive system assembly, comprising a rotating output component (1) and a transmission shaft (2) passing through the rotating output component (1). A power system and a speed change system are installed on the transmission shaft (2). The power system and the speed change system are respectively located on two sides of the rotating output component (1). The power system transmits power to the speed change system by means of the transmission shaft (2), and the speed change system drives the rotating output component (1) to rotate to output the power. The newly designed central drive type structure has the advantages of both a hub motor and a side-mounted structure, makes up for the deficiencies of the hub motor and the side-mounted structure, is especially suitable for a two-wheeled vehicle, not only can well ensure the rotating output component (1), but also has high mechanical efficiency, less heat generation, 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, in particular to a central drive type electric drive system assembly.

Background technique

With the increasingly stringent environmental regulations, it is a general trend that new energy vehicles represented by pure electric vehicles, two-wheeled vehicles, and tricycles will replace traditional fuel vehicles. The existing two-wheeled electric vehicles generally adopt the in-wheel motor and the motor side-mounted structure.

The hub motor is directly driven by a low-speed DC motor, which not only has relatively low efficiency and large heat generation, 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 the transmission system (gearbox or reducer) on the same side of the drive wheel. Although a high-speed motor can be used to improve mechanical efficiency, the weight of the transmission mechanism and the motor is heavier, resulting in poor balance of the wheels. Good, especially for two-wheeled vehicles.

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

Summary of the invention

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

The technical scheme is as follows:

A central drive type electric drive system assembly includes a rotating output component and a transmission shaft passing 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 system is located on both sides of the rotating output component, and the power system transmits power to the transmission system through the transmission shaft, and the transmission system drives the rotation output component to rotate to output the power.

Adopting a newly designed central drive structure, the power system and the transmission system are relatively symmetrically arranged on both sides of the rotating output part, which not only ensures the balance of the rotating output part, but also overcomes the poor balance caused by the traditional side-mounted structure The problem is especially suitable for two-wheeled vehicles, and can use high-speed motors. Compared with traditional in-wheel motors, it has higher mechanical efficiency, less heat generation, better heat dissipation capacity and lighter weight.

Preferably, the power system includes a motor sleeved on the drive shaft and used to drive the drive shaft to rotate, and a power system box body wrapped outside the motor, and the motor and the power system box body are fixed on the drive shaft through a power system locking component. on;

The transmission system includes a transmission mechanism for variable transmission between a transmission shaft and a rotating output member, and a transmission system case packaged outside the transmission mechanism, and the transmission mechanism and the transmission system case are fixed on the transmission shaft through a transmission system locking member .

With the above structure, the power system and the transmission system are independent structures, which can be separately modularized design, easy to install and maintain, and easy to disassemble and install the 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, and the transmission system box includes a gearbox for accommodating a transmission mechanism The base and the gearbox cover on the base of the gearbox;

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

After the transmission base, the transmission mechanism and the transmission case cover are sequentially mounted on the transmission shaft, 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 half-moon key installation grooves that are compatible with the corresponding half-moon keys. The above structure is simple, reliable, and low in cost.

Preferably, it also includes a flat fork. The two main pipes of the flat fork are respectively fixedly connected with the power box base and the gearbox base. With the above structure, the overall structure is stable and reliable, and the influence on the motor and the speed change mechanism is avoided as much as possible.

Preferably, the speed change mechanism includes a primary driving gear fixedly sleeved on the transmission shaft, a reduction intermediate shaft parallel to the transmission shaft, a primary driven gear fixedly sleeved on the reduction intermediate shaft, and a primary driven gear fixedly sleeved on the transmission shaft. The hub drive sleeve and the secondary driven gear fixedly sleeved on the hub drive sleeve, the primary drive gear meshes with the primary driven gear, and the reduction intermediate shaft has a secondary drive meshing with the secondary driven gear The wheel hub drive sleeve can drive the rotation output component to rotate synchronously. By adopting the above structure, the speed reduction transmission can be carried out stably and reliably.

Preferably, a thrust ball bearing is arranged between the hub driving sleeve and the primary driving gear. The adoption of the above structure ensures the reliability of the installation of the wheel hub drive sleeve and the primary driving gear.

Preferably, the hub driving sleeve has a first step surface and a second step surface, the protrusion 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 matched with the spline of the first step surface, and the second-level driven gear is sleeved on the second step surface and is matched with the spline of the second step surface. With the above structure, it is easy to assemble and has high reliability.

Preferably, the motor shaft of the motor has a hollow shaft sleeve structure, and the motor shaft is sleeved on the transmission shaft and is splined with the transmission shaft. The above structure ensures the coaxiality of the motor shaft and the drive shaft, can bear 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. With 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 prior art, the present invention has the following beneficial effects:

The central drive electric drive system assembly adopting the above technical solutions has a novel structure, ingenious design and easy implementation. Through the newly designed central drive structure, it combines the advantages of the hub motor and the side-mounted structure, and makes up for the hub motor and The shortcomings of the side-mounted structure, especially suitable for two-wheeled vehicles, not only can well ensure the balance of the rotating output parts, but also have extremely high mechanical efficiency, less 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, the transmission shaft and the speed change mechanism;

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

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

Figure 5 is a sectional view of the combined wheel;

Fig. 6 is a schematic diagram of one view angle of the wheel hub bracket;

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

Fig. 8 is a schematic diagram of one view angle of the wheel hub;

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

Detailed ways

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

As shown in Figures 1 and 3, a central drive type electric drive system assembly, which mainly includes a rotating output component 1 and a transmission shaft 2 passing through the rotating output component 1, on which the transmission shaft 2 is installed The power system and the transmission system are respectively located on both sides of the rotating output member 1. The power system transmits power to the transmission system through the transmission shaft 2, and the transmission system drives the rotation output member 1 to output power .

Through the newly designed central drive structure, it has the advantages of both the in-wheel motor and the side-mounted structure, and makes up for the insufficiency of the in-wheel motor and the side-mounted structure. It is especially suitable for two-wheeled vehicles and not only can well ensure the rotation of the output components. The balance of power, and it has extremely high mechanical efficiency, less heat generation, better heat dissipation capacity and lighter weight.

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

4-9, 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 compatible with the hub mounting ring 1a1. The hub mounting ring 1b1 can It is detachably fixed to the hub mounting ring 1a1 by a number of bolts 1d. The power system and transmission system of the central drive 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 the bolts 1d need to be removed (no need to disassemble the power system and the transmission system). The wheel hub 1b and the tire 1c can be removed together, which is exactly the same as the traditional way, so that the tire can be changed quickly, and the convenience of maintenance of the central drive electric drive system assembly is improved.

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 by a number of bracket connecting ribs 1a3 , The structure is high in strength, stable and reliable, and light in weight, which can achieve the purpose of weight reduction.

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

A cavity 1a22 is recessed on one side of the power input disc 1a2, a power input sleeve 1a23 is arranged at the center of the cavity 1a22, and the shaft hole of the power input sleeve 1a23 is the drive shaft hole 1a21. The power input sleeve 1a23 is basically hidden in the cavity 1a22 to improve the overall appearance.

A number of reinforcing ribs 1a24 are provided in the cavity 1a22, and each reinforcing rib 1a24 is circumferentially distributed around the power input sleeve 1a23, and the two ends of each reinforcing rib 1a24 are respectively connected to the cavity wall and power of the cavity 1a22. The outer wall connection of the input shaft sleeve 1a23 can greatly improve the structural strength of the power input disc 1a2 and the power input shaft sleeve 1a23. The side of the power input disk 1a2 opposite to the cavity 1a22 protrudes to form a ring-shaped flange 1a25. The outer peripheral surface of the flange 1a25 is provided with a number of reinforcing protrusions 1a26, which can ensure the flange 1a25. Structural strength.

8 and 9, the hub 1b also includes a tire mounting ring 1b2 coaxially arranged outside the hub mounting ring 1b1, and the tire mounting ring 1b2 and the hub mounting ring 1b1 are connected by a plurality of hub connecting ribs 1b3, The structure is high in strength, stable and reliable, and light in weight, which can achieve the purpose of weight reduction. In addition, one side surface of the hub connecting rib 1b3 has a weight-reducing groove 1b31, which realizes the weight-reducing function under the premise of ensuring the structural strength. The hub mounting ring 1b1 is equipped with a mounting sinker 1b11 on one side surface of the hub mounting ring 1a1 that is compatible with the hub mounting ring 1a1. The mounting sinker 1b11 can position the hub mounting ring 1a1, improve assembly efficiency, and improve the hub. The reliability of the connection between the bracket 1a and the hub 1b.

Further, 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.

1 and 2, the power system includes a motor 3 sleeved on the drive shaft 2 and used to drive the drive shaft 2 to rotate, and a power system box 4 wrapped outside the motor 3, the motor 3 and the power system The box body 4 is fixed on the transmission shaft 2 by the power system locking part 6. The transmission system includes a transmission mechanism for variable transmission between the transmission shaft 2 and the combined wheels, and a transmission system case 5 wrapped outside the transmission mechanism. The transmission mechanism and the transmission system case 5 are fixed by a transmission system locking member 7 On the drive shaft 2. It should be pointed out that the sizes of the power system box 4 and the transmission system box 5 are smaller than the inner ring size of the hub mounting ring 1b1, so that the hub bracket 1a and the hub 1b can be removed to the left and can be removed to the right, which is flexible High performance, suitable for different situations.

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, and the transmission system box 5 includes The gearbox base 5a containing the transmission mechanism and the gearbox cover 5b covered on the gearbox base 5a. After the power box base 4a and the motor 3 are mounted on the drive shaft 2 in sequence, they are first locked by the power system locking component 6, and then the power box cover 4b is closed on the power box base 4a, and then the drive 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 sequentially mounted on the transmission shaft 2, 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.

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 adapted to the corresponding half-moon key.

1 and 3, the central drive type electric drive system assembly further includes a flat fork 8, and the two main pipes of the flat fork 8 are respectively fixedly connected to the power box base 4a and the gearbox base 5a. When the tire 1c needs to be replaced, first separate the flat fork 8 from other parts.

Referring to Figure 2, the speed change mechanism includes a primary driving gear 9 fixedly sleeved on the transmission shaft 2, a deceleration intermediate shaft 11 parallel to the transmission shaft 2, and a primary driven gear 10 fixedly sleeved on the deceleration intermediate shaft 11. , The hub drive sleeve 13 lapped on the drive shaft 2 and the secondary driven gear 12 fixedly sleeved on the hub drive sleeve 13, the primary drive gear 9 meshes with the primary driven gear 10, the deceleration middle The shaft 11 has a secondary driving tooth 11a that meshes with the secondary driven gear 12. The hub driving sleeve 13 can drive the combined wheel to rotate synchronously, and a thrust is provided between the hub driving sleeve 13 and the primary driving gear 9 Ball bearing 14.

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 deceleration intermediate shaft 11 to rotate, and the secondary driving gear 11a drives the secondary driven gear 12 to rotate, and the secondary driven gear 12 drives the hub driving sleeve 13 to rotate.

Referring to FIG. 2, the wheel hub drive sleeve 13 has a first-level stepped surface 13a and a second-level stepped surface 13b. The protrusion height of the first-level stepped surface 13a is higher than that of the second-level stepped surface 13b. The combined wheel set On the first stepped surface 13a and splined with the first stepped surface 13a, the second-level driven gear 12 is sleeved on the second stepped surface 13b and splined with the second stepped surface 13b.

The motor shaft 3a of the motor 3 has a hollow shaft sleeve structure, and the motor shaft 3a is sleeved on the transmission shaft 2 and 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.

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, and can connect the motor 3 and the transmission shaft 2 The speed is converted into a signal form for feedback.

1, a power box oil seal 15 is provided between the hub drive sleeve 13 and the power system case 4, and a gearbox oil seal 16 is provided between the wheel hub drive sleeve 13 and the transmission system case 5 to ensure power The tightness of the system case 4 and the transmission system case 5 prevents oil leakage.

Finally, it should be noted that the above description is only a preferred embodiment of the present invention. Under the enlightenment of the present invention, those skilled in the art can make a variety of similar methods without violating the purpose and claims of the present invention. It means that all such transformations fall within the protection scope of the present invention.

Claims

A central drive type electric drive system assembly, comprising a rotating output component (1) and a transmission shaft (2) passing through the rotating output component (1), characterized in that: the transmission shaft (2) is installed There are a power system and a speed change system, the power system and the speed change system are respectively located on both sides of the rotating output component (1), the power system transmits power to the speed change system through the transmission shaft (2), and then the speed change system drives the rotation output The component (1) rotates to output power.
The central drive electric drive system assembly according to claim 1, characterized in that: the power system includes a motor (3) sleeved on the transmission shaft (2) and used to drive the transmission shaft (2) to rotate, and a package In the power system box (4) other than the motor (3), the motor (3) and the power system box (4) are fixed on the drive shaft (2) through the power system locking component (6);

The transmission system includes a transmission mechanism for transmission between a transmission shaft (2) and a rotating output member (1), and a transmission system case (5) wrapped outside the transmission mechanism, the transmission mechanism and the transmission system case ( 5) The locking component (7) of the transmission system is fixed on the transmission shaft (2).
The central drive electric drive system assembly according to claim 2, characterized in that: the power system box (4) includes a power box base (4a) for accommodating a motor (3) and a power box base (4a) that can be covered with The power box cover (4b) on the power box base (4a), the transmission system box (5) includes a transmission base (5a) for accommodating the transmission mechanism and is covered on the transmission base (5a) The gearbox cover (5b);

After the power box base (4a) and the motor (3) are sequentially mounted on the drive shaft (2), they are locked by the power system locking component (6), and then the power box cover (4b) is closed on the power box On the base (4a), cover the first end cover (4c) of the drive shaft on the power box cover (4b);

After the transmission base (5a), the transmission mechanism and the transmission case cover (5b) are sequentially mounted on the transmission shaft (2), they are first locked by the transmission system locking component (7), and then the second end cover of the transmission shaft (5c) Cover on the gearbox cover (5b).
The central drive electric drive system assembly according to claim 3, characterized in that: the power system locking component (6) and the transmission system locking component (7) are both half-moon keys, and the drive shaft (2) is It has a half-moon key installation groove that is compatible with the corresponding half-moon key.
The central drive electric drive system assembly according to claim 3, characterized in that it further comprises a flat fork (8), the two main pipes of the flat fork (8) are respectively connected with the power box base (4a) and the gearbox base (5a) Fixed connection.
The central drive electric drive system assembly according to claim 2, characterized in that: the speed change mechanism comprises a primary driving gear (9) fixedly sleeved on the transmission shaft (2), parallel to the transmission shaft (2) The deceleration intermediate shaft (11), the primary driven gear (10) fixedly sleeved on the deceleration intermediate shaft (11), the hub drive sleeve (13) looped on the transmission shaft (2), and the hub drive sleeve (13) fixedly sleeved on the hub drive The second-stage driven gear (12) on the sleeve (13), the first-stage driving gear (9) meshes with the first-stage driven gear (10), and the reduction intermediate shaft (11) is provided with a second-stage driven gear The secondary driving teeth (11a) meshed with the gear (12), and the hub driving sleeve (13) can drive the rotation output component (1) to rotate synchronously.
The central drive electric drive system assembly according to claim 6, characterized in that: a thrust ball bearing (14) is arranged between the hub drive sleeve (13) and the primary driving gear (9).
The central drive electric drive system assembly according to claim 6, characterized in that: the hub drive sleeve (13) has a first step surface (13a) and a second step surface (13b), and the first step The protruding height of the step surface (13a) is higher than that of the second step surface (13b), and the rotation output component (1) is sleeved on the first step surface (13a) and is splined with the first step surface (13a) , The second-level driven gear (12) is sleeved on the second-level step surface (13b) and spline-fitted with the second-level step surface (13b).
The central drive electric drive system assembly according to claim 1, characterized in that: the motor shaft (3a) of the motor (3) is a hollow shaft sleeve structure, and the motor shaft (3a) is sleeved on the transmission shaft (2). ), and matched with the spline of the drive shaft (2).
The central drive type electric drive system assembly according to claim 3, characterized in that: an encoder (17) is installed on the transmission shaft (2), and the encoder (17) is located at the first end cover ( Between 4c) and the power box cover (4b).