A wheel assembly and an electric vehicle chassis

Abstract

The present invention relates to the technical field of electric vehicles, and discloses a wheel assembly and an electric vehicle chassis. The wheel assembly includes a connecting seat, side mounting seats arranged on both sides of the connecting seat, and a wheel device located between the two side mounting seats. The wheel device is provided with a rotating shaft, and damping connecting blocks are rotatably connected to both ends of the rotating shaft. A swing arm is hinged to both sides of each damping connecting block, and the upper end of the swing arm is movably connected to the side mounting seat. A first damping spring is arranged on the side mounting seat. The present invention has the following advantages and effects: The wheel assembly of the present invention is installed on the electric vehicle chassis, and each wheel assembly can independently steer, with flexible steering, high degrees of freedom, and a stable and well-balanced chassis. It can be used as a sweeping vehicle, a logistics vehicle, a dock vehicle, a food delivery vehicle, etc.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicles, and particularly relates to a wheel assembly and an electric vehicle chassis. Background Art

[0002] An electric vehicle refers to a vehicle powered by an on-vehicle power source and driven by an electric motor to drive the wheels, which has the advantages of no pollution and low noise, and has a relatively small impact on the environment compared with traditional vehicles. For example, the Chinese utility model patent with the authorization announcement number CN213501724U discloses an electric vehicle chassis with four-wheel independent drive and steering, which uses an up-and-down swing mechanism to achieve instant adjustment of the chassis height on uneven ground. The Chinese utility model patent with the authorization announcement number CN205615576U discloses an automobile chassis assembly with four-wheel in-wheel motor drive and four-wheel independent steering, including a frame, a steering motor, and a spring shock absorber assembly. The spring shock absorber assembly realizes shock absorption through a vertically arranged shock-absorbing spring. This requires a shock-absorbing spring with a large size and elasticity to support and shock-absorb the automobile chassis, which will cause the shock-absorbing volume of the wheels to be too large and the automobile chassis to be too high, affecting the driving stability of the electric vehicle. Summary of the Invention

[0003] The purpose of the present invention is to provide a wheel assembly with the effect of small volume.

[0004] The above technical purpose of the present invention is achieved through the following technical solutions: A wheel assembly includes a connecting seat, side mounting seats arranged on both sides of the connecting seat, and a wheel device located between the two side mounting seats. The wheel device is provided with a rotating shaft, and shock-absorbing connecting blocks are rotatably connected to both ends of the rotating shaft. A swing arm is hinged to both sides of each shock-absorbing connecting block. The upper end of the swing arm is movably connected to the side mounting seat, and a first shock-absorbing spring is arranged on the side mounting seat. The elastic force of the first shock-absorbing spring acts on the swing arm to make the swing arm support the side mounting seat.

[0005] The further setting of the present invention is that the movement trajectory of the upper end of the swing arm on the side mounting seat is horizontal or inclined.

[0006] The further setting of the present invention is that the side mounting seat is provided with a cavity and a connecting hole, the connecting hole is communicated with the cavity, the swing arm passes upward through the connecting hole and is located in the cavity, and a bearing is rotatably connected to the upper end of the swing arm, and the bearing is located in the cavity.

[0007] The further setting of the present invention is that the side mounting seat includes a first seat body and a second seat body. The first seat body is provided with a first groove and a second groove, and the second seat body is provided with a third groove and a fourth groove. The first groove and the third groove are combined to form the cavity, and the second groove and the fourth groove are combined to form the connecting hole.

[0008] By adopting the above technical solution, the first seat body and the second seat body can be fixedly connected by bolts and nuts.

[0009] The further setting of the present invention is that: the side mounting seat is provided with a first retaining seat and a second retaining seat. The first retaining seat is fixed on the side mounting seat. The first retaining seat is provided with a through hole. The second retaining seat is movably arranged in the cavity. Both ends of the first damping spring respectively abut against the first retaining seat and the second retaining seat. The second retaining seat is fixed with a guide rod. The guide rod sequentially passes through the first damping spring and the through hole. The bearing abuts against the second retaining seat.

[0010] By adopting the above technical solution, the guide rod sequentially passes through the first damping spring and the through hole, which can play a role in guiding the first damping spring that undergoes elastic deformation and preventing the first damping spring from bending.

[0011] The further setting of the present invention is that: a second damping spring is provided between the damping connection block and the side mounting seat.

[0012] The further setting of the present invention is that: the side mounting seat is installed with a linear bearing. The damping connection block is fixed with a guide post. The guide post upwardly passes through the linear bearing.

[0013] By adopting the above technical solution, the guide post upwardly passes through the linear bearing. During the driving process of the wheel assembly, the wheel assembly moves up and down bumpily. The guide post and the linear bearing can play a guiding role in the movement of the wheel assembly.

[0014] The further setting of the present invention is that: the first damping spring is horizontally placed or obliquely placed, and the second damping spring is vertically placed.

[0015] The further setting of the present invention is that: it further includes a slewing drive device. The slewing drive device is connected to the connection seat. The wheel device includes a hub, a hub motor installed on the hub, and a tire.

[0016] Another object of the present invention is to provide an electric vehicle chassis, including a chassis. The chassis is installed with a plurality of the above-mentioned wheel assemblies and a power source.

[0017] The beneficial effects of the present invention are:

[0018] 1. The present invention provides a shock-absorbing connection block at the rotating shaft of the wheel device. The elastic force of the first shock-absorbing spring acts on the swing arm, which then plays a supporting role between the wheel device and the connecting seat. In this way, the first shock-absorbing spring does not have to be placed vertically, and it can be placed horizontally or obliquely to meet the shock-absorbing requirements, reducing the overall height of the wheel assembly, making the structure compact and the volume smaller. When the wheel assembly is applied to the chassis of an electric vehicle, the height of the electric vehicle chassis from the ground is very low, which can broaden the application scenarios of electric vehicles, such as driverless electric vehicles for logistics and delivery.

[0019] 2. The present invention sets the first shock-absorbing spring and the second shock-absorbing spring to jointly absorb shock, which can appropriately reduce the size of the second shock-absorbing spring. At the same time, the second shock-absorbing spring can also play a supporting role between the wheel device and the connecting plate.

[0020] 3. The wheel assembly of the present invention is installed on the chassis of an electric vehicle. Each wheel assembly can independently steer, with flexible steering, high degrees of freedom, a low chassis, stable form, and good balance. It can be used as a sweeping vehicle, a logistics vehicle, a dock vehicle, a food delivery vehicle, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 It is a schematic diagram of the positional relationship between the chassis and the power supply in Embodiment 1.

[0023] Figure 2 It is a schematic diagram of the positional relationship between the chassis and the wheel assembly in Embodiment 1.

[0024] Figure 3 It is a schematic diagram of the positional relationship between the side mounting seat and the wheel device in Embodiment 1.

[0025] Figure 4 It is a schematic diagram of the connection relationship between the shock-absorbing connection block, the swing arm, the first shock-absorbing spring, the second shock-absorbing spring, and the side mounting seat in Embodiment 1.

[0026] Figure 5 It is a schematic diagram of the positional relationship between the shock-absorbing connection block, the guide post, and the linear bearing in Embodiment 1.

[0027] Figure 6 It is a schematic diagram of the structure of the first seat body in Embodiment 1.

[0028] Figure 7It is a schematic structural diagram of the second seat body in Embodiment 1.

[0029] In the figure, 1 is the connecting seat; 2 is the side mounting seat; 21 is the first seat body; 211 is the first groove body; 212 is the second groove body; 22 is the second seat body; 221 is the third groove body; 222 is the fourth groove body; 23 is the cavity; 24 is the connecting hole; 25 is the first retaining seat; 251 is the through hole; 26 is the second retaining seat; 27 is the guide rod; 28 is the linear bearing; 3 is the wheel device; 31 is the hub; 32 is the hub motor; 33 is the tire; 34 is the rotating shaft; 4 is the shock-absorbing connecting block; 41 is the guide post; 5 is the swing arm; 51 is the bearing; 6 is the first shock-absorbing spring; 7 is the second shock-absorbing spring; 8 is the swing drive device; 9 is the chassis; 91 is the power supply. Specific embodiments

[0030] The technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts belong to the scope of protection of the present invention.

[0031] Embodiment 1: An electric vehicle chassis, as Figures 1 to 3 shown, includes a chassis 9, on which a power supply 91 and four wheel assemblies are installed. The power supply 91 is a lithium battery pack. The wheel assembly includes a swing drive device 8, a connecting seat 1, and a wheel device 3. The swing drive device 8 is installed on the chassis 9 and includes a DC brushless motor. The lithium battery pack supplies power to the DC brushless motor. The swing drive device 8 is connected to the connecting seat 1 and can drive the connecting seat 1 to rotate. The connecting seat 1 is located below the chassis 9, and the wheel device 3 is located below the connecting seat 1.

[0032] As Figures 3 to 6As shown in the figure, side mounting seats 2 are fixed on both sides of the connecting seat 1, and the wheel device 3 is located between the two side mounting seats 2. The wheel device 3 includes a wheel hub 31, a hub motor 32 mounted on the wheel hub 31, and a tire 33. The lithium battery pack supplies power to the hub motor 32. There is a rotating shaft 34 in the middle of the wheel device 3. Shock-absorbing connecting blocks 4 are rotatably connected to both ends of the rotating shaft 34. Rotary arms 5 are hinged on both sides of each shock-absorbing connecting block 4, and a bearing 51 is rotatably connected to the upper end of the rotary arm 5. The side mounting seat 2 is provided with a cavity 23 and a connecting hole 24. The cavity 23 is horizontally arranged, and the connecting hole 24 is located on the lower end face of the side mounting seat 2 and communicates with the cavity 23. The rotary arm 5 passes upward through the connecting hole 24 and is located in the cavity 23, and the bearing 51 is located inside the cavity 23. A second retaining seat 26 is arranged in the cavity 23. The second retaining seat 26 can move horizontally in the cavity 23. The bearing 51 at the upper end of the rotary arm 5 abuts against the second retaining seat 26. The side mounting seat 2 is also fixed with a first retaining seat 25. The first retaining seat 25 is located at the opening of the cavity 23. A first shock-absorbing spring 6 is arranged between the first retaining seat 25 and the second retaining seat 26. The first shock-absorbing spring 6 is horizontally arranged. The second retaining seat 26 is fixed with a guide rod 27, and the first retaining seat 25 is provided with a through hole 251. The guide rod 27 sequentially passes through the first shock-absorbing spring 6 and the through hole 251. The elastic forces of the two first shock-absorbing springs 6 respectively drive the two rotary arms 5 to approach each other to support the side mounting seat 2.

[0033] As Figure 6 、 Figure 7 shown in the figure, the side mounting seat 2 includes a first seat body 21 and a second seat body 22. The first seat body 21 is provided with a first groove 211 and a second groove 212, and the second seat body 22 is provided with a third groove 221 and a fourth groove 222. The first seat body 21 and the second seat body 22 are fixedly connected by bolts and nuts. The first groove 211 and the third groove 221 are combined to form the cavity 23, and the second groove 212 and the fourth groove 222 are combined to form the connecting hole 24. The first retaining seat 25 is fixed on the first seat body 21 and the second seat body 22 by bolts.

[0034] As Figure 4 、 Figure 5 shown in the figure, a second shock-absorbing spring 7 is arranged between the shock-absorbing connecting block 4 and the side mounting seat 2. The second shock-absorbing spring 7 is vertically arranged. A guide post 41 is fixed on the shock-absorbing connecting block 4, and a linear bearing 28 is fixed on the side mounting seat 2. The guide post 41 passes upward through the linear bearing 28. The second shock-absorbing spring 7 is sleeved on the guide post 41. Its upper end abuts against the linear bearing 28, and its lower end abuts against the shock-absorbing connecting block 4.

[0035] The lithium battery pack on the electric vehicle chassis 9 supplies power to the hub motor 32 and the slewing drive device 8. The slewing drive device 8 rotates through the drive connecting seat 1 to drive the wheel device 3 to turn. The hub motor 32 drives the wheel hub 31 to rotate.

[0036] Embodiment 2: An electric vehicle chassis 9, which is different from that of Embodiment 1 in that more than 5 wheel assemblies are installed on the chassis 9, the cavity 23 is inclined, and the first shock-absorbing spring 6 is inclined.

Claims

1. A wheel assembly, comprising a connecting seat (1), side mounting seats (2) arranged on both sides of the connecting seat (1), and a wheel device (3) located between the two side mounting seats (2). Characterized in that: The wheel device (3) is provided with a rotating shaft (34), both ends of the rotating shaft (34) are rotatably connected with shock-absorbing connecting blocks (4), both sides of each shock-absorbing connecting block (4) are hinged with swing arms (5), the upper ends of the swing arms (5) are movably connected to the side mounting seats (2), and a first shock-absorbing spring (6) is arranged on the side mounting seats (2), and the elastic force of the first shock-absorbing spring (6) acts on the swing arms (5) so that the swing arms (5) support the side mounting seats (2); the movement track of the upper ends of the swing arms (5) on the side mounting seats (2) is horizontal or inclined; the side mounting seats (2) are provided with a cavity (23) and a connecting hole (24), the connecting hole (24) is communicated with the cavity (23), the swing arms (5) pass upward through the connecting hole (24) and are located in the cavity (23), a bearing (51) is rotatably connected to the upper ends of the swing arms (5), and the bearing (51) is located in the cavity (23); the side mounting seats (2) include a first seat body (21) and a second seat body (22), the first seat body (21) is provided with a first groove (211) and a second groove (212), the second seat body (22) is provided with a third groove (221) and a fourth groove (222), the first groove (211) and the third groove (221) are combined to form the cavity (23), and the second groove (212) and the fourth groove (222) are combined to form the connecting hole (24); the side mounting seats (2) are provided with a first retaining seat (25) and a second retaining seat (26), the first retaining seat (25) is fixed on the side mounting seat (2), the first retaining seat (25) is provided with a through hole (251), the second retaining seat (26) is movably arranged in the cavity (23), both ends of the first shock-absorbing spring (6) respectively abut against the first retaining seat (25) and the second retaining seat (26), the second retaining seat (26) is fixed with a guide rod (27), the guide rod (27) sequentially passes through the first shock-absorbing spring (6) and the through hole (251), and the bearing (51) abuts against the second retaining seat (26); a second shock-absorbing spring (7) is arranged between the shock-absorbing connecting block (4) and the side mounting seat (2).

2. A wheel assembly according to claim 1, Characterized in that: The side mounting seat (2) is installed with a linear bearing (28), the shock-absorbing connecting block (4) is fixed with a guide post (41), and the guide post (41) passes upward through the linear bearing (28).

3. A wheel assembly according to claim 1, Characterized in that: The first shock-absorbing spring (6) is horizontally placed or inclinedly placed, and the second shock-absorbing spring (7) is vertically placed.

4. A wheel assembly according to claim 1, Characterized in that: It further includes a slewing drive device (8), the slewing drive device (8) is connected to the connecting seat (1), and the wheel device (3) includes a wheel hub (31), a wheel hub motor (32) installed on the wheel hub (31), and a tire (33).

5. An electric vehicle chassis, characterized in that: it includes a chassis (9), and the chassis (9) is installed with a plurality of wheel assemblies and a power supply (91) according to any one of claims 1-4.

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