An electric vehicle wheel assembly capable of recycling road excitation energy

Abstract

The present invention discloses an electric vehicle wheel assembly capable of recovering road excitation energy, which comprises a wheel, a transmission component, and two front and rear shock-absorbing components; the wheel is mounted on the transmission component, and the transmission component connects the front and rear shock-absorbing components, and the front and rear shock-absorbing components are located at the front and rear ends of the wheel; the shock-absorbing component is provided with a lubricating oil circuit I, and the transmission component is provided with a lubricating oil circuit II, and the two are connected. Among them, each shock-absorbing component comprises a spring, a hydraulic cylinder, a piston, a piston rod, a one-way valve, and a shaft sleeve; the oil inlet of the one-way valve is connected to the oil outlet hole at the bottom of the hydraulic cylinder, and the oil outlet of the one-way valve is connected to the radial oil hole of the shaft sleeve; the hydraulic cylinder, the one-way valve, and the radial oil hole of the shaft sleeve constitute the lubricating oil circuit I of the shock-absorbing component. The electric vehicle wheel assembly of the present invention has both the functions of shock absorption and noise reduction and self-lubricating bearings, which can improve the impact wear of the wheel shaft vibration on the bearing, increase the service life of the bearing and the wheel assembly, and reduce the operation and maintenance costs.

Description

Technical Field

[0001] The invention relates to the technical fields of electric vehicle shock absorbers and tribology, and in particular to an electric vehicle wheel assembly capable of recovering road excitation energy. Technical Background

[0002] Electric vehicles are widely used and widely used, playing an important role in opening up the "last mile" of people's travel and urban transportation. With the development of electric vehicle technology, high-speed or medium-high-speed driving on bumpy roads has become a common operating condition. Complex road excitation causes the wheel axle to vibrate greatly and continuously impacts the bearing friction surface. Therefore, the wear and failure of the wheel bearing has become a common fault in the electric vehicle transmission system, which shortens the service life of the electric vehicle.

[0003] At present, electric vehicles all use hydraulic shock absorbers to improve the impact of wheel axle vibration on bearings. Hydraulic shock absorbers use the compressibility of liquids and the principle that liquids absorb energy when compressed and dissipate energy when flowing to achieve the purpose of reducing or eliminating vibrations. Existing hydraulic shock absorbers use springs to absorb shock and then rebound to consume road excitation energy, which mainly plays the role of shock absorption and noise reduction. Its disadvantage is that the energy input by road excitation is innocently dissipated in the form of spring damping shock absorption, resulting in a large amount of resource and energy waste. Therefore, how to recover the excitation energy of uneven roads while achieving the functions of shock absorption and noise reduction has become a problem that the current industry urgently needs to solve.

[0004] In addition, most existing electric vehicle wheels are lubricated by manually disassembling the wheel bearings. Frequent wheel disassembly not only increases the workload, but also causes damage to the wheel components. Summary of the invention

[0005] The problem to be solved by the present invention is to provide an electric vehicle wheel assembly, which has both shock absorption and noise reduction and self-lubricating bearing functions. It recovers the bumpy road excitation energy to transport lubricating oil to the wheel bearing friction interface, improves the impact wear of the wheel shaft vibration on the bearing, increases the service life of the bearing and wheel assembly, and reduces operation and maintenance costs. At the same time, it can effectively prevent waste caused by excessive supply of lubricating oil and ensure long-term lubrication of the bearing. In addition, there is no need to disassemble the wheel bearing for oil replenishment, which extends the service life of the wheel bearing component.

[0006] The present invention discloses an electric vehicle wheel assembly capable of recovering road surface excitation energy, comprising a wheel, a transmission component, and two front and rear shock absorbing components; the wheel is sleeved on the transmission component, the transmission component is connected to the two front and rear shock absorbing components, and the two front and rear shock absorbing components are located at the front and rear ends of the wheel; the shock absorbing component is provided with a lubricating oil circuit I, and the transmission component is provided with a lubricating oil circuit II, and the two are connected.

[0007] Furthermore, each shock absorbing component includes a spring, a hydraulic cylinder, a piston, a piston rod, a one-way valve, and a sleeve; the spring is sleeved on the part of the piston rod extending out of the hydraulic cylinder, the piston is arranged in the hydraulic cylinder, the one-way valve is connected to the bottom of the hydraulic cylinder, and the sleeve is fixed to the lower part of the one-way valve; the oil inlet of the one-way valve is connected to the oil outlet hole at the bottom of the hydraulic cylinder, and the oil outlet of the one-way valve is connected to the radial oil hole of the sleeve; the hydraulic cylinder, the one-way valve, and the radial oil hole of the sleeve constitute the lubricating oil circuit I of the shock absorbing component.

[0008] Furthermore, each shock-absorbing component also includes a pressure cover, the lower part of which is connected to the piston rod and pressed tightly against the spring, and the axial hole at the upper part of which is connected to the body of the electric vehicle.

[0009] Furthermore, the transmission component includes a wheel axle, a bushing, two front and rear ball bearings, and a nut; the wheel axle passes through the front and rear bushings and is locked by the nut, the front and rear ball bearings are arranged in the radial direction of the wheel axle and the wheel, the bushing is sleeved on the middle section of the wheel axle and the ball bearing is axially positioned; the wheel axle is provided with front and rear wheel axle lubrication oil circuits, and the ball bearing is provided with a bearing oil inlet, the wheel axle lubrication oil circuit and the bearing oil inlet constitute the lubrication oil circuit II on the transmission component, the oil inlet holes of the wheel axle lubrication oil circuit are respectively connected to the radial oil holes of the front and rear bushings, and the oil outlet holes are respectively connected to the bearing oil inlets on the front and rear ball bearings.

[0010] Furthermore, the inner and outer rings of the ball bearing respectively match the outer circle of the wheel shaft and the inner hole of the wheel, and one end of the ball bearing contacts the bushing and the other end contacts the shaft sleeve.

[0011] Furthermore, each wheel axle lubricating oil circuit includes an L-shaped oil inlet hole and multiple radial oil outlet holes; the L-shaped oil inlet hole includes a radial oil inlet hole and an axial oil inlet hole, and the radial oil outlet hole is connected to the axial oil inlet hole; multiple bearing oil inlets are arranged on the inner ring of the ball bearing; the radial oil inlet hole is connected to the radial oil hole on the sleeve, and the radial oil outlet hole is connected to the bearing oil inlet; the radial oil inlet hole, the axial oil inlet hole, the radial oil outlet hole, and the bearing oil inlet constitute a connected lubricating oil circuit II.

[0012] Furthermore, the oil outlet hole at the bottom of the hydraulic cylinder and the radial oil hole of the sleeve are positioned opposite to each other and have the same diameter; the radial oil hole and the radial oil inlet hole of the sleeve are positioned opposite to each other and have the same diameter, and the radial oil outlet hole and the oil inlet port of the bearing are positioned opposite to each other; the oil in the hydraulic cylinder flows through the one-way valve, the radial oil holes of the sleeve, the radial oil inlet holes, the axial oil inlet holes, the radial oil outlet holes, and the oil inlet port of the bearing to lubricate the friction interface of the bearing.

[0013] Furthermore, the diameter d1 of the radial oil inlet hole and the diameter d3 of the radial oil outlet hole are both equal to the diameter d2 of the axial oil inlet hole. The diameter d2 of the axial oil inlet hole is determined by the diameter d0 of the wheel axle. The length L2 of the axial oil inlet hole is determined by the length L0 of the wheel axle. The length L1 of the radial oil inlet hole is equal to the length L3 of the radial oil outlet hole. The diameter d4 of the bearing oil inlet is determined by the diameter d3 of the radial oil outlet hole.

[0014] Furthermore, each shock absorbing component also includes a plug, and a transverse oil supply hole is arranged near the bottom of the hydraulic cylinder, and the plug is arranged on the transverse oil supply hole.

[0015] Furthermore, the hydraulic cylinder, lubricating oil circuit I, lubricating oil circuit II and the bearing cavity need to be filled with hydraulic oil before use.

[0016] The advantages of the electric vehicle wheel assembly of the present invention are: 1. A one-way valve is installed at the bottom of the hydraulic cylinder to form a lubricating oil circuit I, and a lubricating oil circuit II is set on the wheel axle and the ball bearing: 1. When passing through uneven road conditions, the vibration displacement of the axle is converted into hydraulic energy in the hydraulic cylinder. The hydraulic energy opens the one-way valve to allow the oil in the hydraulic cylinder to flow into the bearing friction interface through the lubricating oil circuit I and the lubricating oil circuit II, thereby achieving self-lubricating effect on the ball bearing, thereby resisting external impact loads and lubricating the bearing friction components; 2. When passing through good road conditions, the absorbed excitation energy is not enough to open the one-way valve, thereby preventing oil reflux and reducing oil loss at the friction interface; 2. After the electric vehicle wheel assembly has been running for a long time, oil can be regularly added to the hydraulic cylinder through the horizontal oil filling hole to avoid frequent disassembly of the wheel bearing for manual oil filling, further reducing the work intensity, ensuring the matching accuracy of the wheel assembly, and extending the service life of the wheel bearing components. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional diagram of the electric vehicle wheel assembly of the present invention.

[0018] Figure 2 It is a three-dimensional view of a part of the wheel assembly of the electric vehicle of the present invention (without the wheel).

[0019] Figure 3 It is a three-dimensional diagram of the shock absorbing component.

[0020] Figure 4 This is a cross-sectional view of the shock-absorbing component (without the spring and gland).

[0021] Figure 5 A three-dimensional diagram of the wheel axle.

[0022] Figure 6 A cross-sectional view of the wheel axle.

[0023] Figure 7 A three-dimensional diagram of a ball bearing.

[0024] Figure 8A cross-sectional view of a ball bearing.

[0025] Fig. 9 A three-dimensional image of a wheel.

[0026] In the figure: 1 spring; 2 one-way valve; 3 hydraulic cylinder; 4 piston; 5 plug; 6 wheel axle; 7 radial oil inlet hole; 8 axial oil inlet hole; 9 radial oil outlet hole; 10 ball bearing; 11 bearing oil inlet; 12 bushing; 13 nut; 14 wheel; 15 piston rod; 16 bushing; 17 pressure cover. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0028] Example 1

[0029] from Figure 1 , Figure 2 , Fig. 9 It can be seen that the present invention is an electric vehicle wheel assembly that can recover road excitation energy, which includes a wheel 14, a transmission component, and two front and rear shock-absorbing components; the wheel 14 is mounted on the transmission component, the transmission component connects the two front and rear shock-absorbing components, and the front and rear shock-absorbing components are located at the front and rear ends of the wheel 14; the shock-absorbing component is provided with a lubricating oil circuit I, and the transmission component is provided with a lubricating oil circuit II, and the two are connected.

[0030] The working principle of the electric vehicle wheel assembly of the present invention is: when the electric vehicle is traveling on an uneven road surface, the excitation energy of the uneven road surface causes the lubricating oil in the shock absorbing component to reach the transmission component through the lubricating oil circuit I and the lubricating oil circuit II, thereby lubricating the bearings in the transmission component. Therefore, while realizing the shock absorption and noise reduction functions, the electric vehicle wheel assembly of the present invention can also lubricate the transmission component through the excitation energy of the uneven road surface, play the role of a self-lubricating bearing, realize energy recovery and reuse, and avoid energy loss.

[0031] Example 2

[0032] from Figure 1 , Figure 2 , Figure 3 , Figure 4 It can be seen that the electric vehicle wheel assembly of the present invention: each shock-absorbing component includes a spring 1, a hydraulic cylinder 3, a piston 4, a piston rod 15, a one-way valve 2, and a shaft sleeve 16; the spring 1 is sleeved on the part of the piston rod 15 extending out of the hydraulic cylinder 3, the piston 4 is arranged in the hydraulic cylinder 3, the one-way valve 2 is connected to the bottom of the hydraulic cylinder 3, and the shaft sleeve 16 is fixed to the lower part of the one-way valve 2; the oil inlet of the one-way valve 2 is connected to the oil outlet hole at the bottom of the hydraulic cylinder 3, and the oil outlet of the one-way valve 2 is connected to the radial oil hole of the shaft sleeve 16; the hydraulic cylinder 3, the one-way valve 2, and the radial oil holes of the shaft sleeve 16 constitute the lubricating oil circuit I of the shock-absorbing component.

[0033] from Figure 1 , Figure 2 , Figure 3 It can be seen that each shock absorbing component also includes a pressure cap 17, the bottom of the pressure cap 17 is connected to the piston rod 15 and is tightly pressed on the spring 1, and the axial hole on the upper part is connected to the body of the electric vehicle, thereby realizing the connection between the wheel assembly and the electric vehicle.

[0034] The lubricating oil circuit of the shock-absorbing component provides lubricating oil for the transmission component, and the lubricating oil keeps a sufficient amount of lubricating oil at the friction interface of the bearing ball. Specifically, when the electric vehicle is running on an uneven road, the transmission component is vibrated by the stimulation of the road surface, and the piston rod 15 continuously reciprocates in the hydraulic cylinder 3. When the piston rod 15 retracts into the hydraulic cylinder 3, the oil in the hydraulic cylinder 3 is squeezed to generate liquid pressure. When the oil pressure is large enough to overcome the spring pre-pressure in the one-way valve 2, the one-way valve 2 opens, and the oil in the hydraulic cylinder 3 flows into the friction interface of the bearing in the transmission component through the one-way valve 2, the radial oil hole of the sleeve 16, and the lubricating oil circuit of the transmission component. The oil resists the external impact load at the bearing friction interface and lubricates the bearing friction components. When the piston rod 15 extends out of the hydraulic cylinder 3, the volume of the oil in the hydraulic cylinder 3 increases, which reduces the oil pressure. When the oil pressure is lower than the opening pressure of the one-way valve, the one-way valve closes, and the oil in the hydraulic cylinder 3 no longer supplies oil to the bearing interface. The closing of the one-way valve can prevent the oil in the bearing cavity from flowing back, reducing the oil loss at the bearing friction interface. As can be seen from the above, under uneven road conditions, the piston rod reciprocates, making the oil supply mode of the bearing interface intermittent.

[0035] When driving on a good road, the transmission parts vibrate slightly and the impact load on the bearing is small. At this time, the original oil in the bearing cavity can provide good lubrication, and no additional oil supply is needed to resist the impact load. The transmission parts vibrate less under good road conditions, and the reciprocating displacement of the piston rod 15 in the hydraulic cylinder 3 is small. When the piston rod 15 retracts into the hydraulic cylinder 3, the oil is slightly squeezed, and the oil pressure increases slightly, which is not enough to open the one-way valve 2; when the piston rod 15 extends out of the hydraulic cylinder 3, the oil pressure in the hydraulic cylinder 3 is even smaller, and the one-way valve 2 is continuously closed. Avoid excessive supply of lubricating oil and prevent oil loss.

[0036] Therefore, the electric vehicle wheel assembly of the present invention can not only achieve the functions of shock absorption and noise reduction, but also lubricate the transmission components through the excitation energy of the uneven road surface, play the role of a self-lubricating bearing, realize energy recovery and reuse, and avoid energy loss; at the same time, it can effectively prevent the waste caused by excessive supply of lubricating oil and ensure long-term lubrication of the bearing.

[0037] The opening pressure of the one-way valve 2 is determined by the spring stiffness and pre-compression of the one-way valve. The one-way valve 2 ensures that the oil in the hydraulic cylinder 3 flows to the transmission component through the one-way valve and does not flow back. The spring 1 absorbs the shock and rebounds to consume the road excitation energy, which mainly plays the role of shock absorption and noise reduction.

[0038] Example 3

[0039] from Figure 1 , Figure 2 , Figure 5 , Figure 6 , Figure 7 , Figure 8 It can be seen that the electric vehicle wheel assembly of the present invention: the transmission component includes a wheel axle 6, a bushing 12, two front and rear ball bearings 10, and a nut 13; the wheel axle 6 passes through the two front and rear bushings 16 and is locked by the nut 13, the front and rear ball bearings 10 are arranged in the radial direction of the wheel axle 6 and the wheel 14, the bushing 12 is sleeved on the middle section of the wheel axle 6 and the ball bearing 10 is axially positioned; the wheel axle 6 is provided with front and rear wheel axle lubrication oil circuits, and the ball bearing 10 is provided with a bearing oil inlet 11, the wheel axle lubrication oil circuit and the bearing oil inlet 11 constitute the lubrication oil circuit II on the transmission component, the oil inlet holes of the wheel axle lubrication oil circuit are respectively communicated with the radial oil holes of the front and rear bushings 16, and the oil outlet holes are respectively communicated with the bearing oil inlets 11 on the two front and rear ball bearings 10.

[0040] The inner and outer rings of the ball bearing 10 respectively match the outer circle of the wheel shaft 6 and the inner hole of the wheel 14 , and one end of the ball bearing 10 contacts the bushing 12 and the other end contacts the shaft sleeve 16 .

[0041] During the driving of the electric vehicle, the wheel 14 rotates relative to the wheel shaft 6 through the ball bearing 10. When the electric vehicle is driving on uneven roads, the oil in the hydraulic cylinder 3 flows into the friction interface of the bearing through the one-way valve 2, the radial oil hole of the sleeve 16, the lubricating oil path of the wheel shaft 6, and the bearing oil inlet 11 of the ball bearing 10. The oil resists the external impact load at the bearing friction interface and lubricates the bearing friction components.

[0042] Example 4

[0043] from Figure 5 , Figure 6 It can be seen that the electric vehicle wheel assembly of the present invention: each wheel axle lubricating oil circuit includes an L-shaped oil inlet hole and multiple radial oil outlet holes 9; the L-shaped oil inlet hole includes a radial oil inlet hole 7 and an axial oil inlet hole 8, and the radial oil outlet hole 9 is connected to the axial oil inlet hole 8; a plurality of bearing oil inlets 11 are arranged on the inner ring of the ball bearing 10; the radial oil inlet hole 7 is connected to the radial oil hole on the shaft sleeve 16, and the radial oil outlet hole 9 is connected to the bearing oil inlet 11; the radial oil inlet hole 7, the axial oil inlet hole 8, the radial oil outlet hole 9, and the bearing oil inlet 11 constitute a connected lubricating oil circuit II.

[0044] The oil outlet hole at the bottom of the hydraulic cylinder 3 and the radial oil hole of the sleeve 16 are opposite to each other and have the same diameter; the radial oil hole of the sleeve 16 and the radial oil inlet hole 7 are opposite to each other and have the same diameter, and the radial oil outlet hole 9 and the bearing oil inlet port 11 are opposite to each other; the oil in the hydraulic cylinder 3 flows through the one-way valve 2, the radial oil holes of the sleeve 16, the radial oil inlet holes 7, the axial oil inlet holes 8, the radial oil outlet holes 9, and the bearing oil inlet port 11 to lubricate the bearing friction interface.

[0045] The diameter d1 of the radial oil inlet hole 7 and the diameter d3 of the radial oil outlet hole 9 are both equal to the diameter d2 of the axial oil inlet hole 8. The diameter d2 of the axial oil inlet hole 8 is determined by the diameter d0 of the wheel axle 6. Generally, the diameter d0 of the wheel axle 6 is 12 mm to 18 mm.

[0046] The length L2 of the axial oil inlet hole 8 is determined by the length L0 of the wheel axle 6. The length L1 of the radial oil inlet hole 7 is equal to the length L3 of the radial oil outlet hole 9. Generally, the length L0 of the wheel axle 6 is 135 mm to 200 mm.

[0047] Generally, the diameter d4 of the bearing oil inlet 11 is determined by the diameter d3 of the radial oil outlet hole 9.

[0048] Preferably, the diameter of the radial oil inlet hole 7 is 2mm-5mm, and one is provided along the outer circumference; the diameter of the axial oil inlet hole 8 is 2mm-5mm, the axial length range is 20mm-30mm, and one is provided along the axial direction; the diameter of the radial oil outlet hole 9 is 2mm-5mm, and 4-8 are evenly distributed along the outer circumference, and each radial oil outlet hole 9 is connected to a bearing oil inlet 11. Preferably, the diameter of the bearing oil inlet 11 is 0.05mm-0.1mm, and 10-20 are evenly distributed along the inner ring circumference.

[0049] Example 5

[0050] from Figure 4 It can be seen that the electric vehicle wheel component of the present invention: each shock-absorbing component also includes a plug 5, and a transverse oil supply hole is arranged near the bottom of the hydraulic cylinder 3, and the plug 5 is arranged on the transverse oil supply hole.

[0051] After the hydraulic shock absorber has been running for a long time, the wheel assembly of the present invention can regularly replenish oil to the hydraulic cylinder 3 through the transverse oil replenishing hole by removing the plug 5, avoiding frequent disassembly of the wheel bearing for manual oil replenishment, further reducing the work intensity and extending the service life of the wheel bearing components.

[0052] Among them, the hydraulic cylinder 3, the lubricating oil circuit I, the lubricating oil circuit II and the bearing cavity need to be filled with hydraulic oil before use.

[0053] The advantages of the electric vehicle wheel assembly of the present invention are: 1. When passing through uneven road conditions, it plays a role in cushioning and absorbing the excitation energy of the uneven road surface, converting the vibration displacement of the axle into hydraulic energy in the hydraulic cylinder. The hydraulic energy opens the one-way valve to allow the oil in the hydraulic cylinder to flow into the bearing friction interface through the lubricating oil circuit I and the lubricating oil circuit II, thereby realizing the self-lubricating effect on the ball bearing, thereby resisting external impact loads and lubricating the bearing friction components; 2. When passing through good road conditions, the absorbed excitation energy is not enough to open the one-way valve, thereby preventing the oil from flowing back and reducing the oil loss at the friction interface; 3. After the electric vehicle wheel assembly has been running for a long time, oil can be regularly added to the hydraulic cylinder through the horizontal oil filling hole, avoiding frequent disassembly of the wheel bearing for manual oil filling, further reducing the work intensity, ensuring the matching accuracy of the wheel assembly, and extending the service life of the wheel bearing components.

[0054] In summary, the electric vehicle wheel assembly of the present invention has both the functions of shock absorption and noise reduction and self-lubricating bearings. It improves the impact wear of the wheel shaft vibration on the bearing by lubricating the bearing; it can effectively prevent the waste caused by excessive supply of lubricating oil and ensure long-term lubrication of the bearing; it does not need to disassemble the wheel bearing for repair. The electric vehicle wheel assembly of the present invention prolongs the service life of the bearing and wheel assembly and reduces the operation and maintenance costs.

Claims

1. An electric vehicle wheel assembly capable of recovering road excitation energy, characterized in that: It comprises a wheel (14), a transmission component, and two front and rear shock absorbing components; the wheel (14) is sleeved on the transmission component, the transmission component connects the two front and rear shock absorbing components, and the two front and rear shock absorbing components are located at the front and rear ends of the wheel (14); the shock absorbing component is provided with a lubricating oil circuit I, and the transmission component is provided with a lubricating oil circuit II, and the two are connected; each shock absorbing component comprises a spring (1), a hydraulic cylinder (3), a piston (4), a piston rod (15), a one-way valve (2), and a shaft sleeve (16); the spring (1) is sleeved on the part of the piston rod (15) extending out of the hydraulic cylinder (3), the piston (4) is arranged in the hydraulic cylinder (3), the one-way valve (2) is connected to the bottom of the hydraulic cylinder (3), and the shaft sleeve (16) is fixed to the lower part of the one-way valve (2); the oil inlet of the one-way valve (2) is connected to the oil outlet hole at the bottom of the hydraulic cylinder (3), and the oil outlet of the one-way valve (2) is connected to the radial oil hole of the shaft sleeve (16); the hydraulic cylinder (3), the one-way valve (2), the shaft sleeve (16) The radial oil holes of the sleeve (16) and the radial oil holes of the sleeve (16) constitute the lubricating oil circuit I of the shock absorbing component; the transmission component comprises a wheel shaft (6), a sleeve (12), two front and rear ball bearings (10), and a nut (13); the wheel shaft (6) passes through the two front and rear sleeves (16) and is locked by the nut (13); the two front and rear ball bearings (10) are arranged in the radial direction of the wheel shaft (6) and the wheel (14); the sleeve (12) is sleeved on the middle section of the wheel shaft (6) and axially positions the ball bearing (10); the wheel shaft (6) is provided with two front and rear wheel shaft lubricating oil circuits, and the ball bearing (10) is provided with a bearing oil inlet (11); the wheel shaft lubricating oil circuit and the bearing oil inlet (11) constitute the lubricating oil circuit II on the transmission component; the oil inlet holes of the wheel shaft lubricating oil circuit are respectively communicated with the radial oil holes of the front and rear sleeves (16), and the oil outlet holes are respectively communicated with the bearing oil inlets (11) on the two front and rear ball bearings (10).

2. The electric vehicle wheel assembly according to claim 1, characterized in that: Each shock-absorbing component also includes a pressure cover (17), the lower part of which is connected to the piston rod (15) and is tightly pressed on the spring (1), and the shaft hole at the upper part is connected to the body of the electric vehicle.

3. The electric vehicle wheel assembly according to claim 1, characterized in that: The inner and outer rings of the ball bearing (10) respectively match the outer circle of the wheel shaft (6) and the inner hole of the wheel (14); one end of the ball bearing (10) contacts the bushing (12) and the other end contacts the shaft sleeve (16).

4. The electric vehicle wheel assembly according to claim 1, characterized in that: Each wheel axle lubricating oil circuit comprises an L-shaped oil inlet hole and a plurality of radial oil outlet holes (9); the L-shaped oil inlet hole comprises a radial oil inlet hole (7) and an axial oil inlet hole (8), and the radial oil outlet hole (9) is connected to the axial oil inlet hole (8); a plurality of bearing oil inlets (11) are arranged on the inner ring of the ball bearing (10); the radial oil inlet hole (7) is connected to the radial oil hole on the shaft sleeve (16), and the radial oil outlet hole (9) is connected to the bearing oil inlet (11); the radial oil inlet hole (7), the axial oil inlet hole (8), the radial oil outlet hole (9), and the bearing oil inlet (11) constitute a connected lubricating oil circuit II.

5. The electric vehicle wheel assembly according to claim 4, characterized in that: The oil outlet hole at the bottom of the hydraulic cylinder (3) and the radial oil hole of the shaft sleeve (16) are positioned opposite to each other and have the same diameter; the radial oil hole of the shaft sleeve (16) and the radial oil inlet hole (7) are positioned opposite to each other and have the same diameter; the radial oil outlet hole (9) and the bearing oil inlet port (11) are positioned opposite to each other; the oil in the hydraulic cylinder (3) flows through the one-way valve (2), the radial oil hole of the shaft sleeve (16), the radial oil inlet hole (7), the axial oil inlet hole (8), the radial oil outlet hole (9) and the bearing oil inlet port (11) to lubricate the bearing friction interface.

6. The electric vehicle wheel assembly according to claim 4, characterized in that: The diameter d1 of the radial oil inlet hole (7) and the diameter d3 of the radial oil outlet hole (9) are both equal to the diameter d2 of the axial oil inlet hole (8). The diameter d2 of the axial oil inlet hole (8) is determined by the diameter d0 of the wheel axle (6). The length L2 of the axial oil inlet hole (8) is determined by the length L0 of the wheel axle (6). The length L1 of the radial oil inlet hole (7) is equal to the length L3 of the radial oil outlet hole (9). The diameter d4 of the bearing oil inlet (11) is determined by the diameter d3 of the radial oil outlet hole (9).

7. The electric vehicle wheel assembly according to claim 1, characterized in that: Each shock absorbing component also includes a plug (5), and a transverse oil replenishing hole is arranged near the bottom of the hydraulic cylinder (3), and the plug (5) is arranged on the transverse oil replenishing hole.

8. The electric vehicle wheel assembly according to claim 1, characterized in that: The hydraulic cylinder (3), lubricating oil circuit I, lubricating oil circuit II and the bearing cavity must be filled with hydraulic oil before use.

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