Pure electric tractor chassis structure and tractor

Abstract

The invention relates to the technical field of tractor chassis, in particular to a pure electric tractor chassis structure and a tractor, the pure electric tractor chassis structure comprises a frame and cross beams, and further comprises a horizontal adjusting assembly, a vertical adjusting assembly, a battery pack, a push switch and a reinforcing plate, the horizontal adjusting assembly is installed between the two cross beams, the vertical adjusting assembly is connected with the horizontal adjusting assembly, and the push switch is connected with the battery pack. The battery pack is installed between the inner side of the vertical adjusting assembly and the surfaces of the cross beams, the reinforcing plate is installed between the two cross beams, the pressing switch is installed on the side, close to the battery pack, of the reinforcing plate, and the horizontal adjusting assembly drives the vertical adjusting assembly to move horizontally. By lowering the gravity center and moving the gravity center forward when climbing a steep slope and ensuring the road holding force of the front wheels of the tractor, the problems of steering failure and insufficient driving caused by insufficient friction force due to the fact that the gravity center deviates backwards when a traction carriage of an existing tractor climbs a slope and turns are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of tractor chassis, and in particular to a pure electric tractor chassis structure and a tractor. Background Art

[0002] A tractor is a commercial vehicle specially used for towing trailers, mainly used for transporting goods. It is connected with a semi-trailer or a full trailer to form a complete transport unit. Tractors are widely used in logistics transportation, long-distance freight and other fields, and are an indispensable and important tool in modern road transportation. With the development of new energy technologies, pure electric tractors have gradually been put into use on the market. Due to the limited amount of electrical energy that can be stored, pure electric tractors have a limited range. When driving a certain distance, pure electric tractors need to be charged. Therefore, pure electric tractors are mainly suitable for short-distance transportation and closed areas of logistics plants.

[0003] In Yunnan, Guizhou, Sichuan and other regions of my country, when pure electric tractors tow cargo carriages loaded with foam boxes for short-distance transportation, the electric motors that provide power input can quickly output high torque at low speeds to ensure the performance of the electric tractors when starting, accelerating and climbing. In order to ensure the stability of pure electric tractors and carriages during normal driving and prevent the tractors from tilting forward due to braking during driving, the center of gravity of the tractor is usually set in the middle of the tractor. However, when pure electric tractors are climbing some steep slopes with large slopes, due to the increase in the longitudinal inclination angle of the tractor and the carriage, the center of gravity will move backward along the longitudinal axis of the tractor and the carriage. The backward shift of the center of gravity will cause the vertical load of the front wheels to decrease, thereby reducing the grip of the front wheels, which in turn affects the traction and stability of the tractor, making it impossible for the tractor to pull the trailer to complete the uphill operation. In addition, at the turns of the slope, the front wheels are prone to lose their guiding function due to tilting, which is very likely to cause safety accidents.

[0004] To this end, a pure electric tractor chassis structure and a tractor are proposed. Summary of the invention

[0005] The purpose of the present invention is to provide a pure electric tractor chassis structure and a tractor, which solves the problem of steering failure and insufficient driving of the existing tractor due to insufficient friction caused by the center of gravity biased to the rear when the tractor car turns when climbing a slope by lowering the center of gravity and moving the center of gravity forward to ensure the grip of the front wheels of the tractor, and has the effect of flexibly adjusting the overall center of gravity to ensure the turning effect and climbing ability of the tractor and the car.

[0006] To achieve the above object, the present invention provides the following technical solutions: A pure electric tractor chassis structure includes a frame, a crossbeam, a horizontal adjustment component, a vertical adjustment component, a battery pack, a push switch and a reinforcement plate, wherein the horizontal adjustment component is installed between two crossbeams, the vertical adjustment component is connected to the horizontal adjustment component, the battery pack is installed between the inner side of the vertical adjustment component and the surface of the crossbeam, the reinforcement plate is installed between the two crossbeams, and the push switch is installed on a side of the reinforcement plate close to the battery pack. When the horizontal adjustment component drives the vertical adjustment component to move horizontally, the battery pack applies pressure to the push switch when it moves to an extreme position with the vertical adjustment component. At the same time, the push switch disconnects the power supply of the horizontal adjustment component and starts the vertical adjustment component. The vertical adjustment component changes the height of the battery pack in the vertical direction.

[0007] When climbing a slope, since the center of gravity of the tractor and the carriage is located far behind the front of the vehicle, the friction between the front wheels and the ground is small, and the drive wheels cannot have sufficient friction due to insufficient pressure, resulting in front wheel steering failure and drive wheel slippage. In this case, the center of gravity of the tractor and the carriage is moved forward and the height is lowered by moving the battery pack forward and lowering the height through the horizontal adjustment component and the vertical adjustment component, thereby ensuring the friction between the front wheels and the drive wheels and the ground, and thus ensuring the climbing and turning effects of the tractor when towing a carriage with a smaller mass.

[0008] Preferably, a limiting groove is provided on the surface of the crossbeam, and the axis of the limiting groove is arranged parallel to the axis of the crossbeam.

[0009] Preferably, the horizontal adjustment assembly includes a horizontal frame, a screw rod, a slider, and a drive motor. The two horizontal frames are respectively fitted on the inner walls of the two beams. The two screw rods are respectively rotatably connected to the two horizontal frames, and one end of the screw rod extends to the outside of the horizontal frame. The slider is slidably arranged between the inner walls of the horizontal frames, and the slider is threadedly connected to the screw rod. The drive motor is installed on the side of the reinforcement plate away from the battery pack, and the output shaft of the drive motor is respectively connected to the ends of the two screw rods through pulleys and belts. The side wall of the slider is configured with a slot.

[0010] Preferably, the vertical adjustment assembly includes a fixed frame, a lifting rod and an electric rod, the fixed frame is installed between a plurality of slots, notches are constructed on both sides of the inner wall of the fixed frame, the side walls of the lifting rod are slidably fitted with the notches, and the electric rod is installed between the side walls of the lifting rod and the surface of the fixed frame.

[0011] Preferably, the battery pack includes a main battery and a secondary battery, the main battery is mounted on the surface of the fixing frame, the secondary battery is slidably fitted on the surface of the beam, U-shaped bars are installed at both ends of the main battery, and inserting bars adapted to the U-shaped bars are installed on both sides of the secondary battery, and the U-shaped bar is separated from the inserting bar when the main battery is lowered.

[0012] Preferably, a limiting block is installed at the bottom of the secondary battery, and the limiting block is slidably fitted in the limiting groove.

[0013] Preferably, the number of the vertical adjustment components is set to multiple groups, and the number of the vertical adjustment components is consistent with the number of battery groups.

[0014] A tractor comprises a pure electric tractor chassis structure, a tilt sensor, tires and a front of the vehicle, wherein the tilt sensor is mounted at the bottom of a cross beam on one side, the tires are distributed in a rectangular array and are connected to a vehicle frame, and the front of the vehicle is mounted on the surface of the cross beam.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. When the present invention is towing a vehicle loaded with foam boxes and performing a short reverse operation and needs to climb a slope with a certain slope and turn, the position and height of the battery pack with a larger weight ratio can be adjusted in time, thereby greatly adjusting the center of gravity position and center of gravity height of the tractor and the vehicle, providing sufficient friction for the front wheels and the driving wheels, thereby ensuring that the tractor can climb the slope smoothly and safely.

[0016] 2. By setting up a horizontal adjustment component and a push switch, when the horizontal adjustment component moves the battery pack close enough to the front of the vehicle, the battery pack applies pressure to the push switch, thereby switching the working states of the horizontal adjustment component and the vertical adjustment component, and quickly adjusting the center of gravity of the tractor and the carriage. The operation is relatively simple and can achieve a one-step adjustment effect.

[0017] 3. By setting the crossbeam and battery pack, when the battery pack moves with the horizontal adjustment component, the main battery and the auxiliary battery move horizontally at the same time. However, when the vertical adjustment component is working, the main battery moves downward with the fixing frame, and the auxiliary battery is limited on the crossbeam. Therefore, under the condition of limited width of the tractor chassis, the center of gravity of the tractor and the carriage is changed to the greatest extent possible, thereby ensuring the turning effect and driving effect of the tractor when climbing a slope. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a structural schematic diagram of the crossbeam and the reinforcing plate of the present invention; Figure 3 It is a structural schematic diagram of the vertical adjustment assembly of the present invention; Figure 4 It is a structural schematic diagram of the level adjustment assembly of the present invention; Figure 5 It is a schematic diagram of the structure of the battery pack of the present invention; Figure 6 An exploded view of a battery pack of the present invention; Figure 7 It is a structural schematic diagram of the vertical adjustment assembly and the main battery of the present invention; Figure 8 It is a structural schematic diagram of the slider of the present invention.

[0019] In the figure: 1. frame; 2. crossbeam; 21. limit slot; 3. horizontal adjustment assembly; 31. horizontal frame; 32. screw rod; 33. slider; 331. slot; 34. drive motor; 4. vertical adjustment assembly; 41. fixed frame; 42. lifting rod; 43. electric rod; 5. battery pack; 51. main battery; 511. U-shaped bar; 52. auxiliary battery; 521. limit block; 522. insert strip; 6. push switch; 7. reinforcement plate; 8. tilt sensor; 9. tire; 10. front of the vehicle. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] See also Figures 1 to 8 The present invention provides a pure electric tractor chassis structure and a tractor, and the technical solution is as follows: Reference Figure 1 and Figure 2A pure electric tractor chassis structure includes a frame 1 and a crossbeam 2. Two crossbeams 2 are parallelly distributed and installed on the top of the frame 1. The area between the crossbeams 2 can be used as a space for adjusting the center of gravity. It also includes a horizontal adjustment component 3, a vertical adjustment component 4, a battery pack 5, a push switch 6 and a reinforcement plate 7. The horizontal adjustment component 3 is installed between the two crossbeams 2. The vertical adjustment component 4 is connected to the horizontal adjustment component 3. The horizontal adjustment component 3 and the vertical adjustment component can also play a certain reinforcement effect between the two crossbeams 2, thereby improving the stability of the crossbeam 2. The battery pack 5 is installed on the inner side of the vertical adjustment component 4 and between the surface of the crossbeam 2. When the center of gravity position needs to be adjusted, the horizontal adjustment component 3 first drives the vertical adjustment component to move horizontally, thereby changing the horizontal position of the battery pack 5, and then the vertical adjustment component changes the height of some components in the battery pack 5, thereby changing the center of gravity height of the tractor. The reinforcement plate 7 is installed between the two crossbeams 2. The reinforcement plate 7 plays a role of limiting and reinforcing. The push switch 6 is installed on one side of the reinforcement plate 7 close to the battery pack 5 When the horizontal adjustment component 3 drives the battery pack 5 to move to the horizontal limit position through the vertical adjustment component 4, the side wall of the battery pack 5 contacts the push switch 6 and applies pressure to the push switch 6. When the horizontal adjustment component 3 drives the vertical adjustment component 4 to move horizontally, the battery pack 5 applies pressure to the push switch 6 when it moves to the limit position with the vertical adjustment component 4. The position where the battery pack 5 closest to the reinforcement plate 7 can no longer move to the side of the reinforcement plate 7 is the limit position. At the same time, the push switch 6 disconnects the power supply of the horizontal adjustment component 3 and starts the vertical adjustment component 4. The vertical adjustment component 4 changes the height of the battery pack 5 in the vertical direction. Under normal circumstances, it is necessary to ensure that the battery pack 5 is located above the crossbeam 2 to avoid the battery pack 5 from being bumped when passing through a rugged road. Considering the limitation of the cruising range, if conditions permit, it is necessary to install as many battery packs 5 as possible, which can not only effectively improve the cruising range of the pure electric tractor, but also increase the weight proportion of the battery pack 5 in the tractor. By changing the position of the battery pack 5 later, the center of gravity adjustment of the tractor has a better effect.

[0022] Reference Figure 3 As an embodiment of the present invention, specifically, a limiting groove 21 is provided on the surface of the beam 2, and the axis of the limiting groove 21 is arranged parallel to the axis of the beam 2. When the battery pack 5 moves horizontally, the contact part between the battery pack 5 and the beam 2 can move horizontally along the limiting groove 21.

[0023] Reference Figure 4 and Figure 7As an embodiment of the present invention, specifically, the horizontal adjustment component 3 includes a horizontal frame 31, a screw rod 32, a slider 33, and a drive motor 34. The two horizontal frames 31 are respectively fitted on the inner walls of the two beams 2, and the two horizontal frames 31 are respectively fitted on the adjacent sides of the two beams 2. The two screw rods 32 are respectively rotatably connected to the two horizontal frames 31, and one end of the screw rod 32 extends to the outside of the horizontal frame 31. The external threads of the two screw rods 32 have the same rotation direction. The slider 33 is slidably set between the inner walls of the horizontal frames 31, and the slider 33 is threadedly connected to the screw rod 32. The drive motor 34 is installed on the side of the reinforcement plate 7 away from the battery pack 5, and the drive The output shaft of the motor 34 is connected to the ends of the two screw rods 32 through pulleys and belts respectively. Pulleys are installed on the ends of the screw rods 32 and the output shaft of the driving motor 34, and the pulley at the end of the output shaft of the driving motor 34 is connected to the pulley at the end of the screw rod 32 through a belt. The driving motor 34 drives the two screw rods 32 to rotate at the same time. Since the rotation direction of the external threads on the outer circumference of the two screw rods 32 is the same, when the driving motor 34 is started, the two screw rods 32 rotate in the same direction, so that the sliders 33 on the two screw rods 32 keep moving in the same direction. The side wall of the slider 33 is constructed with a slot 331. The design of the slot 331 facilitates the installation and connection of the vertical adjustment component 4 and the slider 33.

[0024] Reference Figure 3 As an embodiment of the present invention, specifically, the vertical adjustment component 4 includes a fixing frame 41, a lifting rod 42 and an electric rod 43. The fixing frame 41 is installed between the plurality of slots 331, and the fixing frame 41 and the slider 33 are reinforced by suitable fasteners. Notches are constructed on both sides of the inner wall of the fixing frame 41. The top view cross section of the notch is U-shaped. The side wall of the lifting rod 42 slides and fits with the notch. The lifting rod 42 contacts the fixing frame 41 through the notch and has a large contact area, which can effectively improve the stability of the lifting rod 42 when the vertical displacement occurs. The top view cross section of the lifting rod 42 is H-shaped. The electric rod 43 is installed between the side wall of the lifting rod 42 and the surface of the fixing frame 41. When the electric rod 43 contracts, the lifting rod 42 moves down along the notch, thereby reducing the height of the main battery 51. When the electric rod 43 is extended, the lifting rod 42 moves up along the notch, thereby restoring the main battery 51 to its initial height, thereby ensuring that the main battery 51 has a certain height above the ground during the driving of the tractor, thereby ensuring the passability of the tractor.

[0025] Reference Figure 5 and Figure 6As an embodiment of the present invention, specifically, the battery pack 5 includes a main battery 51 and a secondary battery 52. ​​The main battery 51 is mounted on the surface of the fixing frame 41, and the secondary battery 52 is slidably attached to the surface of the crossbeam 2. U-shaped bars 511 are mounted on both ends of the main battery 51, and plug-in bars 522 adapted to the U-shaped bars 511 are mounted on both sides of the secondary battery 52. ​​When the main battery 51 is lowered, the U-shaped bar 511 is separated from the plug-in bar 522. Under the design of the plug-in bar 522 and the U-shaped bar 511, when the main battery 51 and the secondary battery 52 are at the same height, the main battery 51 and the secondary battery 52 can form an integrated structure. The structure can realize synchronous horizontal movement. When the height of the main battery 51 is lowered, the main battery 51 and the auxiliary battery 52 are automatically separated. The main battery 51 and the auxiliary battery 52 are connected to the circuit control board through independent wires. Since the main battery 51 and the auxiliary battery 52 have a certain displacement, in order to avoid the wires falling to the ground after the main battery 51 and the auxiliary battery 52 are displaced and causing the wires to be worn, the wires connecting the main battery 51 and the auxiliary battery 52 and the circuit control board are provided with wire take-ups. When the wires are loose, the excess length of the wires can be reeled in time to avoid the wires falling to the ground.

[0026] Reference Figure 6 As an embodiment of the present invention, specifically, a limiting block 521 is installed at the bottom of the auxiliary battery 52, and the limiting block 521 is slidably fitted in the limiting groove 21. When the auxiliary battery 52 moves horizontally, the cooperation between the limiting groove 21 and the limiting block 521 can ensure the horizontal movement of the auxiliary battery 52, and at the same time, when the auxiliary battery 52 is separated from the main battery 51 later, the auxiliary battery 52 is prevented from falling off from the surface of the beam 2. The limiting block 521 is connected to the auxiliary battery 52 through a spring. When the limiting block 521 moves to the edge of the limiting groove 21, the edge depth of the limiting groove 21 is greater. Under the action of the spring, the limiting block 521 is inserted into the edge of the limiting groove 21. At this time, the auxiliary battery 52 can be prevented from sliding randomly along the surface of the beam 2, and the bottom of the limiting block 521 is designed in a V shape. When the main battery 51 moves horizontally later, the main battery 51 drives the limiting block 521 at the bottom of the auxiliary battery 52 to withdraw from the edge of the limiting groove 21.

[0027] Reference Figure 1 As an embodiment of the present invention, specifically, the number of vertical adjustment components 4 is set to multiple groups, and the number of vertical adjustment components 4 is consistent with the number of battery packs 5. During the design, other components of the tractor are designed to be lightweight, and the number of battery packs 5 is adjusted accordingly to enhance the effect of adjusting the center of gravity of the battery packs 5. In addition, the foam box loaded on the car body has a small density and a large gap inside, so the total weight of the car body is close to the total weight of the tractor. In this case, the position of the battery pack 5, which occupies a certain ratio of the total weight of the tractor, is changed, which can have a better adjustment effect on the change of the center of gravity of the tractor and the car body.

[0028] Reference Figure 1A tractor includes a pure electric tractor chassis structure, a tilt sensor 8, a tire 9 and a front 10. The tilt sensor 8 is installed at the bottom of a cross beam 2 on one side. The tires 9 are distributed in a rectangular array and are installed and connected to a frame 1. The front 10 is installed on the surface of the cross beam 2. The tilt sensor 8 is connected to a control system of the vehicle. The control system calculates and analyzes the feedback slope value and correspondingly starts a horizontal adjustment component 3 to adjust a battery pack 5 to a suitable position.

[0029] Working principle: When the tractor tows the car loaded with foam boxes and needs to climb a turning ramp, the slope value of the ramp is fed back to the control system of the tractor by the tilt sensor 8. Then the control system calculates the optimal center of gravity position, connects the power supply of the horizontal adjustment component 3 through the corresponding circuit system, and then moves the vertical adjustment component 4 and the battery pack 5 to a suitable horizontal position, ensuring that the center of gravity of the tractor and the car is reasonably distributed, thereby ensuring the turning effect and climbing effect of the tractor; Specifically, the output shaft of the driving motor 34 drives the two screw rods 32 with the same external threads to rotate through the pulley and the belt, and the multiple sliders 33 all move in the same direction along the inner wall of the horizontal frame 31, thereby driving the fixing frame 41, the lifting rod 42, and the electric rod 43 to move toward the side of the front of the vehicle 10, and in this process, the horizontal positions of the main battery 51 and the auxiliary battery 52 are changed until the center of gravity of the tractor and the vehicle body is adjusted to a suitable position, and then the climbing operation can be performed; When the center of gravity of the tractor and the carriage needs to be adjusted to the extreme position, the main battery 51 moves toward the reinforcing plate 7 together with the slider 33 until the main battery 51 applies pressure to the push switch 6, and then the power of the electric rod 43 is turned on, the electric rod 43 contracts, and the height of the lifting rod 42 and the main battery 51 is lowered, and the U-shaped bars 511 at both ends of the main battery 51 are separated from the insertion bars 522 and fall freely, further lowering the center of gravity of the tractor and the carriage; After the climbing operation is completed, the control system of the tractor first moves the battery pack 5 up and resets it, plugs the plug 522 into the U-shaped bar 511, and then controls the drive motor 34 to reverse, restores the main battery 51 and the auxiliary battery 52 to their initial positions, and ensures the stability of the tractor when traveling at high speed.

[0030] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pure electric tractor chassis structure, comprising a frame (1) and a crossbeam (2), characterized in that: The invention also comprises a horizontal adjustment component (3), a vertical adjustment component (4), a battery pack (5), a push switch (6) and a reinforcement plate (7), wherein the horizontal adjustment component (3) is installed between the two cross beams (2), the vertical adjustment component (4) is connected to the horizontal adjustment component (3), the battery pack (5) is installed between the inner side of the vertical adjustment component (4) and the surface of the cross beam (2), the reinforcement plate (7) is installed between the two cross beams (2), and the push switch (6) is installed on a side of the reinforcement plate (7) close to the battery pack (5). When the horizontal adjustment component (3) drives the vertical adjustment component (4) to move horizontally, the battery pack (5) applies pressure to the push switch (6) when it moves to the extreme position along with the vertical adjustment component (4), and at the same time, the push switch (6) disconnects the power supply of the horizontal adjustment component (3) and starts the vertical adjustment component (4), and the vertical adjustment component (4) changes the height of the battery pack (5) in the vertical direction.

2. A pure electric tractor chassis structure according to claim 1, characterized in that: A limiting groove (21) is provided on the surface of the crossbeam (2), and the axis of the limiting groove (21) is arranged parallel to the axis of the crossbeam (2).

3. The pure electric tractor chassis structure according to claim 1, characterized in that: The horizontal adjustment component (3) comprises a horizontal frame (31), a screw rod (32), a slider (33), and a drive motor (34); the two horizontal frames (31) are respectively mounted on the inner walls of the two cross beams (2); the two screw rods (32) are respectively rotatably connected to the two horizontal frames (31), and one end of the screw rod (32) extends to the outside of the horizontal frame (31); the slider (33) is slidably arranged between the inner walls of the horizontal frame (31), and the slider (33) is threadedly connected to the screw rod (32); the drive motor (34) is mounted on a side of the reinforcement plate (7) away from the battery pack (5), and the output shaft of the drive motor (34) is respectively connected to the ends of the two screw rods (32) through a pulley and a belt; and the side wall of the slider (33) is configured with a slot (331).

4. A pure electric tractor chassis structure according to claim 3, characterized in that: The vertical adjustment assembly (4) comprises a fixing frame (41), a lifting rod (42) and an electric rod (43); the fixing frame (41) is installed between a plurality of slots (331); both sides of the inner wall of the fixing frame (41) are provided with notches; the side walls of the lifting rod (42) are slidably fitted with the notches; and the electric rod (43) is installed between the side walls of the lifting rod (42) and the surface of the fixing frame (41).

5. The pure electric tractor chassis structure according to claim 1, characterized in that: The battery pack (5) comprises a main battery (51) and a secondary battery (52); the main battery (51) is mounted on the surface of a fixing frame (41); the secondary battery (52) is slidably fitted on the surface of a crossbeam (2); both ends of the main battery (51) are mounted with U-shaped bars (511); both sides of the secondary battery (52) are mounted with inserting bars (522) adapted to the U-shaped bars (511); when the main battery (51) is lowered, the U-shaped bars (511) and the inserting bars (522) are separated.

6. The pure electric tractor chassis structure according to claim 5, characterized in that: A limiting block (521) is installed at the bottom of the secondary battery (52), and the limiting block (521) is slidably fitted in the limiting groove (21).

7. The pure electric tractor chassis structure according to claim 1, characterized in that: The number of the vertical adjustment components (4) is set to be multiple groups, and the number of the vertical adjustment components (4) is consistent with the number of battery groups (5).

8. A tractor, comprising the pure electric tractor chassis structure according to any one of claims 1 to 7, characterized in that: It also includes a tilt sensor (8), a tire (9) and a front vehicle (10), wherein the tilt sensor (8) is mounted on the bottom of one side of the cross beam (2), the tires (9) are distributed in a rectangular array and are mounted and connected to the vehicle frame (1), and the front vehicle (10) is mounted on the surface of the cross beam (2).

Images