Rear lower vehicle body of vehicle and vehicle

Abstract

The utility model relates to the technical field of vehicles, and discloses a rear lower vehicle body of a vehicle and the vehicle, the rear lower vehicle body of the vehicle comprises a first longitudinal beam, a second longitudinal beam, a rear drive axle, a first plate spring and a second plate spring, and the first longitudinal beam and the second longitudinal beam are arranged at an interval in the left-right direction of the vehicle; the rear drive axle is arranged below the first longitudinal beam and the second longitudinal beam in the up-down direction of the vehicle, and the rear drive axle is provided with a first end and a second end in the left-right direction of the vehicle; in the vertical direction of the vehicle, the first plate spring is arranged between the first end and the first longitudinal beam, the first end is installed on the first longitudinal beam through the first plate spring, the second plate spring is arranged between the second end and the second longitudinal beam, and the second end is installed on the second longitudinal beam through the second plate spring. The technical problem that a longitudinal beam is prone to fatigue fracture due to the fact that the longitudinal beam is impacted by a limiting support is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to a rear lower vehicle body of a vehicle and the vehicle. BACKGROUND

[0002] With the rapid development of social economy and the continuous improvement of people's living standards, as an important modern transportation tool, automobiles play an increasingly key role in people's daily life. As a key component of the automobile system, the development of leaf springs is closely related to the progress of the automobile industry. In the related technology, the leaf spring is installed below the rear drive axle, and the limit support for installing the buffer member is arranged on the longitudinal beam. The limit support is used to limit the movement range of the leaf spring in the up-down direction of the vehicle, so as to prevent the amplitude of the leaf spring in the up-down direction of the vehicle from being too large. However, the limit support is arranged on the longitudinal beam, and when the leaf spring deforms, it will hit the limit support with the buffer member installed. The limit support is fixedly connected with the longitudinal beam in a rigid manner, and the longitudinal beam is impacted by the limit support, which is easy to cause fatigue fracture of the longitudinal beam. CONTENT OF THE UTILITY MODEL

[0003] The present application provides a rear lower vehicle body of a vehicle and the vehicle, which solves the technical problem that the longitudinal beam is impacted by the limit support, which is easy to cause fatigue fracture of the longitudinal beam.

[0004] In order to achieve the above purpose, the main technical scheme adopted by the present application includes:

[0005] In a first aspect, the present application provides a rear lower vehicle body of a vehicle, which comprises a first longitudinal beam, a second longitudinal beam, a rear drive axle, a first leaf spring and a second leaf spring. Along the left-right direction of the vehicle, the first longitudinal beam and the second longitudinal beam are arranged at intervals. Along the up-down direction of the vehicle, the rear drive axle is arranged below the first longitudinal beam and the second longitudinal beam. Along the left-right direction of the vehicle, the rear drive axle has a first end and a second end. Along the up-down direction of the vehicle, the first leaf spring is arranged between the first end and the first longitudinal beam, and the first end is installed on the first longitudinal beam through the first leaf spring. The second leaf spring is arranged between the second end and the second longitudinal beam, and the second end is installed on the second longitudinal beam through the second leaf spring.

[0006] The rear lower vehicle body provided by the embodiment of the present application sets the first leaf spring between the first longitudinal beam and the first drive axle and sets the second leaf spring between the second longitudinal beam and the first drive axle, so that when the vehicle vibrates, on the one hand, the first leaf spring and the second leaf spring can be closer to the first longitudinal beam and the second longitudinal beam, thereby reducing the vibration amplitude of the first leaf spring and the second leaf spring in the vertical direction of the vehicle; on the other hand, the first leaf spring and the second leaf spring can directly contact the first longitudinal beam and the second longitudinal beam in a large area, compared with setting a limiting support on the first longitudinal beam and the second longitudinal beam to limit the vibration amplitude of the first leaf spring and the second leaf spring, which can expand the contact area of the first leaf spring and the second leaf spring with the first longitudinal beam and the second longitudinal beam, reduce the probability of stress concentration of the first longitudinal beam and the second longitudinal beam, reduce the probability of fracture of the first longitudinal beam and the second longitudinal beam, thereby prolonging the service life of the first longitudinal beam and the second longitudinal beam.

[0007] Optionally, the rear lower vehicle body further comprises a first buffer block and a second buffer block, the first buffer block is fixedly connected with the first leaf spring, and the second buffer block is fixedly connected with the second leaf spring; along the up-down direction of the vehicle, the first buffer block is located between the first leaf spring and the first longitudinal beam, and the second buffer block is located between the second leaf spring and the second longitudinal beam.

[0008] The first buffer block is located between the first leaf spring and the first longitudinal beam, and the second buffer block is located between the second leaf spring and the second longitudinal beam, which can reduce the probability of fatigue damage of the first longitudinal beam and the second longitudinal beam and prolong the service life of the first longitudinal beam and the second longitudinal beam.

[0009] Optionally, the rear lower vehicle body further comprises a first support and a first leaf spring lug, the first support and the first leaf spring lug are both fixed to the first longitudinal beam; along the front-rear direction of the vehicle, the first leaf spring has a third end and a fourth end arranged oppositely, the third end is fixed to the first support, and the fourth end is fixed to the first leaf spring lug.

[0010] The first leaf spring and the first longitudinal beam are connected through the first support and the first leaf spring lug, compared with connecting the first leaf spring and the first longitudinal beam through two first supports, in the technical solution of the present application, the number of the first support is only one, so that the connection cost of the first leaf spring and the first longitudinal beam is reduced, thereby reducing the manufacturing cost of the vehicle.

[0011] Optionally, along the up-down direction of the vehicle, the size of the first support is greater than the size of the first leaf spring lug.

[0012] Thus, when the vehicle turns, the first leaf spring of the wheel on the outer side (relative to the turning direction) will be subjected to greater pressure, and the reaction force generated by the first leaf spring when compressed will be more beneficial to resisting the roll of the vehicle. Since the fourth end is higher than the third end, the fourth end of the first leaf spring has greater deformation space and elastic force when the vehicle rolls, and can more effectively inhibit the roll of the vehicle, so that the vehicle maintains a better posture when turning, and the driving safety is improved.

[0013] Optionally, the rear lower vehicle body further comprises a second bracket and a second leaf spring lug; the second bracket and the second leaf spring lug are both fixed to the second longitudinal beam; the second leaf spring has a fifth end and a sixth end arranged oppositely along the front-rear direction of the vehicle, the fifth end is fixed to the second bracket, and the sixth end is fixed to the second leaf spring lug; the size of the second bracket is greater than the size of the second leaf spring lug along the up-down direction of the vehicle.

[0014] The second leaf spring is connected to the second longitudinal beam through the second bracket and the second leaf spring lug. Compared to connecting the second leaf spring to the second longitudinal beam by arranging two second brackets, the number of second brackets in the technical solution is only one, so that the connection cost of the second leaf spring and the second longitudinal beam is reduced, and the manufacturing cost of the vehicle is further reduced. When the vehicle turns, the second leaf spring of the wheel on the outer side (relative to the turning direction) will be subjected to greater pressure, and the reaction force generated by the second leaf spring when compressed will be more beneficial to resisting the roll of the vehicle. Since the sixth end is higher than the fifth end, the sixth end of the second leaf spring has greater deformation space and elastic force when the vehicle rolls, and can more effectively inhibit the roll of the vehicle, so that the vehicle maintains a better posture when turning, and the driving safety is improved.

[0015] Optionally, the rear lower vehicle body further comprises a first buffer block bracket and a first leaf spring clamping plate, the first leaf spring clamping plate is fixedly connected with the first end of the rear drive axle, the first buffer block bracket and the first leaf spring clamping plate are arranged on both sides of the first leaf spring along the up-down direction of the vehicle, and the first buffer block is arranged on the side of the first buffer block bracket away from the first leaf spring; the rear lower vehicle body further comprises a first connecting piece, the first connecting piece comprises a first bottom rod and two first side rods arranged at the left end and the right end of the first bottom rod, the first bottom rod abuts against the first buffer block bracket, and the end portions of the two first side rods away from the first bottom rod are fixed to the first leaf spring clamping plate.

[0016] The first buffer block bracket is fixed on the first leaf spring through the first connecting piece, so that the first buffer block bracket can be firmly fixed on the first leaf spring, and the stability and reliability of the vehicle in operation are improved.

[0017] Optionally, the rear lower vehicle body further comprises a second buffer block support and a second leaf spring clamp plate, the second leaf spring clamp plate is fixedly connected with the second end of the rear drive axle, the second buffer block support and the second leaf spring clamp plate are arranged on two sides of the second leaf spring in the up-down direction of the vehicle, and the second buffer block is arranged on the side of the second buffer block support away from the second leaf spring; the rear lower vehicle body further comprises a second connecting piece, the second connecting piece comprises a second bottom rod and two second side rods arranged at the left end and the right end of the second bottom rod, the second bottom rod abuts against the second buffer block support, and the ends of the two second side rods away from the second bottom rod are fixedly connected with the second leaf spring clamp plate.

[0018] The second buffer block support is fixed on the second leaf spring through the second connecting piece, so that the second buffer block support can be firmly fixed on the second leaf spring, and the stability and reliability of the vehicle in operation are improved.

[0019] Optionally, one end of the first side rod away from the first bottom rod is provided with a first thread, and one end of the second side rod away from the second bottom rod is provided with a second thread; the first connecting piece comprises a first nut, and the second connecting piece comprises a second nut; the first side rod is threadedly connected with the first nut through the first leaf spring clamp plate, and the second side rod is threadedly connected with the second nut through the second leaf spring clamp plate.

[0020] The first side rod is threadedly connected with the first nut through the first leaf spring clamp plate, and the second side rod is threadedly connected with the second nut through the second leaf spring clamp plate, so that on the one hand, the first connecting piece and the first leaf spring clamp plate are fixedly connected, and the second connecting piece and the second leaf spring clamp plate are fixedly connected, thereby improving the safety and reliability of the vehicle as a whole, and on the other hand, when the parts need to be repaired, the first connecting piece and the first leaf spring clamp plate and the second connecting piece and the second leaf spring clamp plate can be conveniently disassembled, thereby improving the repair efficiency.

[0021] Optionally, the rear lower vehicle body further comprises a first reinforcing plate and a second reinforcing plate, the first reinforcing plate is arranged on the first longitudinal beam, and the second reinforcing plate is arranged on the second longitudinal beam; at least part of the first reinforcing plate is located between the first longitudinal beam and the first buffer block in the up-down direction of the vehicle, and at least part of the second reinforcing plate is located between the second longitudinal beam and the second buffer block in the up-down direction of the vehicle.

[0022] At least part of the first reinforcing plate is located between the first longitudinal beam and the first buffer block in the up-down direction of the vehicle, and at least part of the second reinforcing plate is located between the second longitudinal beam and the second buffer block in the up-down direction of the vehicle, so that the probability of fatigue damage of the first longitudinal beam and the second longitudinal beam can be reduced.

[0023] In a second aspect, the embodiments of the present application further provide a vehicle, which comprises the rear lower vehicle body according to any one of the embodiments of the present application.

[0024] The vehicle provided by the embodiment of the present application is provided with a first leaf spring arranged between the first longitudinal beam and the first drive axle and a second leaf spring arranged between the second longitudinal beam and the first drive axle. In this way, when the vehicle vibrates, on the one hand, the first leaf spring and the second leaf spring can be closer to the first longitudinal beam and the second longitudinal beam, thereby reducing the vibration amplitude of the first leaf spring and the second leaf spring in the vertical direction of the vehicle; on the other hand, the first leaf spring and the second leaf spring can directly and extensively contact the first longitudinal beam and the second longitudinal beam, compared with arranging a limiting support on the first longitudinal beam and the second longitudinal beam to limit the vibration amplitude of the first leaf spring and the second leaf spring, which can expand the contact area of the first leaf spring and the second leaf spring and the first longitudinal beam and the second longitudinal beam, reduce the probability of stress concentration of the first longitudinal beam and the second longitudinal beam, reduce the probability of fracture of the first longitudinal beam and the second longitudinal beam, thereby prolonging the service life of the first longitudinal beam and the second longitudinal beam. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the specific embodiments of the present application or the prior art, the drawings needed in the description of the specific embodiments or the prior art will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0026] Figure 1 The application scenario diagram of the first leaf spring and the second leaf spring provided by the embodiment of the present application is shown;

[0027] Figure 2 The side view of Figure 1 ;

[0028] Figure 3 The side view of Figure 1 ;

[0029] Figure 4 The structure schematic diagram of the first buffer block abutting against the first reinforcing plate is shown;

[0030] Figure 5 The structure schematic diagram of the rear lower vehicle body provided by the embodiment of the present application is shown;

[0031] Figure 6 The structure schematic diagram of the first connecting piece provided by the embodiment of the present application is shown;

[0032] Figure 7 The structure schematic diagram of the second connecting piece provided by the embodiment of the present application is shown.

[0033]

Explanation of reference signs

[0034] The rear lower vehicle body 100;

[0035] The first longitudinal beam 110;

[0036] Second longitudinal beam 120;

[0037] Rear drive axle 130; first end 131; second end 132;

[0038] First leaf spring 140; third end 141; fourth end 142;

[0039] Second leaf spring 150; fifth end 151; sixth end 152;

[0040] First shock block bracket 160; first shock block 161;

[0041] Second shock block bracket 170; second shock block 171;

[0042] First bracket 180; second bracket 190;

[0043] First leaf spring ear 200; second leaf spring ear 210;

[0044] First connecting piece 220; first bottom bar 221; first side bar 222; first thread 223; first nut 224;

[0045] Second connecting piece 230; second bottom bar 231; second side bar 232; second thread 233; second nut 234;

[0046] First leaf spring clamp plate 240;

[0047] Second leaf spring clamp plate 250;

[0048] First reinforcing plate 260; second reinforcing plate 270;

[0049] Left-right direction X; up-down direction Y; front-rear direction Z. DETAILED DESCRIPTION

[0050] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0051] Unless otherwise defined, all technical and scientific terms used in the present application have the same meanings as those commonly understood by one of ordinary skill in the art to which this application belongs; the terms used in the present application, unless defined differently, are used to describe specific embodiments of the present application for purposes of explanation and not intended to limit the present application; the terms "include" and "have" and any variations thereof in the present application and the claims of the present application and the above description of drawings are intended to cover the non-exclusive inclusion; the terms "first", "second" and the like in the present application and the claims of the present application or the above description of drawings are used to distinguish different objects, not to describe a particular order or primary and secondary relationship.

[0052] In the present application, the phrase "embodiments" means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it mutually exclusive or alternative to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in the present application can be combined with other embodiments.

[0053] In the description of the present application, it should be noted that unless otherwise specified and limited, the terms "mounting", "connecting", "connecting", "attaching" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0054] The term "and / or" in the present application is only a description of the association relationship between the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in the present application generally represents that the front and rear associated objects have an "or" relationship.

[0055] "Multiple" in the present application refers to more than two (including two), and similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0056] With the rapid development of social economy and the continuous improvement of people's living standards, as an important modern transportation tool, cars play an increasingly key role in people's daily life. From the initial simple means of transportation, vehicle technology has undergone countless innovations and breakthroughs, and has made significant progress in power performance, safety performance, comfort and intelligence.

[0057] As a key component of the automobile system, the development of the leaf spring is closely related to the progress of the automobile industry. When the vehicle faces complex road conditions, the leaf spring will deform and produce displacement in the up-down direction of the vehicle. The limit support for installing the buffer is arranged on the longitudinal beam, and the limit support is used to limit the movement range of the leaf spring in the up-down direction of the vehicle, so as to prevent the amplitude of the leaf spring in the up-down direction of the vehicle from being too large.

[0058] However, in the related art, the leaf spring is arranged below the rear drive axle, two supports are needed to fix the leaf spring, the manufacturing cost is high, and the roll performance is not good. The limit support is arranged on the longitudinal beam, and when the leaf spring deforms, it will hit the limit support with the buffer installed. The limit support and the longitudinal beam are fixedly connected in rigidity, the longitudinal beam is impacted by the limit support, and the longitudinal beam is prone to fatigue fracture.

[0059] In view of this, the rear lower vehicle body of the vehicle provided by an embodiment of the present application comprises a first longitudinal beam, a second longitudinal beam, a rear drive axle, a first leaf spring and a second leaf spring.

[0060] The first longitudinal beam and the second longitudinal beam are arranged in the left-right direction of the vehicle; the rear drive axle is arranged below the first longitudinal beam and the second longitudinal beam in the up-down direction of the vehicle; the rear drive axle has a first end and a second end in the left-right direction of the vehicle; the first leaf spring is arranged between the first end and the first longitudinal beam in the up-down direction of the vehicle, and the first end is installed on the first longitudinal beam through the first leaf spring; and the second leaf spring is arranged between the second end and the second longitudinal beam, and the second end is installed on the second longitudinal beam through the second leaf spring.

[0061] In the above scheme, the first leaf spring is arranged between the first longitudinal beam and the first drive axle, and the second leaf spring is arranged between the second longitudinal beam and the first drive axle. In this way, when the vehicle vibrates, on the one hand, the distance between the first leaf spring and the first longitudinal beam and the distance between the second leaf spring and the second longitudinal beam can be made closer, thereby reducing the amplitude of the first leaf spring and the second leaf spring in the vertical direction of the vehicle; on the other hand, the first leaf spring and the second leaf spring can directly contact the first longitudinal beam and the second longitudinal beam in a large area. Compared with limiting the vibration amplitude of the first leaf spring and the second leaf spring by arranging the limit support on the first longitudinal beam and the second longitudinal beam, the contact area of the first leaf spring and the second leaf spring with the first longitudinal beam and the second longitudinal beam can be expanded, the probability of stress concentration of the first longitudinal beam and the second longitudinal beam can be reduced, the probability of fracture of the first longitudinal beam and the second longitudinal beam can be reduced, and the service life of the first longitudinal beam and the second longitudinal beam can be prolonged.

[0062] The following embodiments are described by taking the rear lower vehicle body of the vehicle of an embodiment of the present application as an example for convenience of description.

[0063] Figure 1 The application scenario diagram of the first leaf spring and the second leaf spring provided by the embodiment of the present application is shown in the following figure; Figure 2 TheFigure 1 a side view of the vehicle body; Figure 3 is Figure 1 a side view of the vehicle body; Figure 4 a structure diagram showing that the first buffer block abuts against the first reinforcing plate; Figure 5 a structure diagram of a rear lower vehicle body provided in an embodiment of the application; Figure 6 a structure diagram of a first connecting piece provided in an embodiment of the application; Figure 7 a structure diagram of a second connecting piece provided in an embodiment of the application.

[0064] Please refer to Figure 1 and Figure 5 In the embodiment of the application, the rear lower vehicle body 100 of the vehicle includes a first longitudinal beam 110, a second longitudinal beam 120, a rear drive axle 130, a first leaf spring 140, and a second leaf spring 150. The first longitudinal beam 110 is arranged in a spaced manner with the second longitudinal beam 120 along the left-right direction X of the vehicle. The rear drive axle 130 is arranged below the first longitudinal beam 110 and the second longitudinal beam 120 along the up-down direction Y of the vehicle. The rear drive axle 130 has a first end 131 and a second end 132 along the left-right direction X of the vehicle. The first leaf spring 140 is arranged between the first end 131 and the first longitudinal beam 110 along the up-down direction Y of the vehicle. The first end 131 is installed on the first longitudinal beam 110 through the first leaf spring 140. The second leaf spring 150 is arranged between the second end 132 and the second longitudinal beam 120. The second end 132 is installed on the second longitudinal beam 120 through the second leaf spring 150.

[0065] The first longitudinal beam 110 and the second longitudinal beam 120 bear most of the weight of the vehicle, including the vehicle body, the engine, the transmission, the cargo, and the driver and passengers. Through reasonable structural design and the application of high-strength materials, the first longitudinal beam 110 and the second longitudinal beam 120 can withstand huge vertical loads and dynamic impact forces, ensuring that the vehicle can maintain a stable driving state under various road conditions and load conditions.

[0066] The rear drive axle 130 is arranged below the first longitudinal beam 110 and the second longitudinal beam 120 along the up-down direction Y of the vehicle. The rear drive axle 130 is a key hub for transmitting engine power to the rear wheels. The torque generated by the engine is transmitted to the rear drive axle 130 through the clutch, the transmission, the drive shaft, and other components, and then increased in torque by the main reducer, and finally accurately transmitted to the rear wheels through the half shaft to drive the vehicle to move forward or backward.

[0067] The extension direction of the rear drive axle 130 is parallel to the left-right direction X of the vehicle along the left-right direction X of the vehicle. The rear drive axle 130 has a first end 131 and a second end 132. For example, the first end 131 can be at the left end of the vehicle, and the second end 132 can be at the right end of the vehicle. The rear wheels can be arranged at the left end and the right end of the rear drive axle 130, respectively.

[0068] When the vehicle is running, the road conditions are complex and changeable, and pits, bumps and other factors will generate impact force on the vehicle. The first leaf spring 140 and the second leaf spring 150 have good elasticity, and when the wheels encounter these uneven road surfaces, the first leaf spring 140 and the second leaf spring 150 can quickly elastically deform to convert the impact force into their own elastic potential energy, thereby effectively buffering the shock and reducing the impact energy transmitted to the vehicle body.

[0069] The first leaf spring 140 is arranged between the first end 131 and the first longitudinal beam 110, that is, along the up-down direction Y of the vehicle, the first leaf spring 140 is arranged between the rear drive axle 130 and the first longitudinal beam 110. Similarly, along the up-down direction Y of the vehicle, the second leaf spring 150 is arranged between the rear drive axle 130 and the second longitudinal beam 120. The first end 131 is connected with the first longitudinal beam 110 through the first leaf spring 140, the second end 132 is connected with the second longitudinal beam 120 through the second leaf spring 150, and the rear drive axle 130 can be fixed on the first longitudinal beam 110 and the second longitudinal beam 120 through the first leaf spring 140 and the second leaf spring 150. The first leaf spring 140 and the second leaf spring 150 not only connect the rear drive axle 130 with the first longitudinal beam 110 and the second longitudinal beam 120, but also can buffer and absorb shock and bear load.

[0070] When the vehicle is impacted due to uneven road surface, the first leaf spring 140 and the second leaf spring 150 will move up and down in the vertical direction of the vehicle, thereby generating a certain range of amplitude. It is necessary to control the amplitude of the first leaf spring 140 and the second leaf spring 150 in the vertical direction within a certain range to prevent the first leaf spring 140 and the second leaf spring 150 from being broken due to excessive amplitude.

[0071] Specifically, the first leaf spring 140 is arranged between the first longitudinal beam 110 and the first drive axle, and the second leaf spring 150 is arranged between the second longitudinal beam 120 and the first drive axle. In this way, when the vehicle vibrates, on the one hand, the distance between the first leaf spring 140 and the first longitudinal beam 110 and the distance between the second leaf spring 150 and the second longitudinal beam 120 can be made closer, thereby reducing the amplitude of the first leaf spring 140 and the second leaf spring 150 in the vertical direction of the vehicle; on the other hand, the first leaf spring 140 and the second leaf spring 150 can directly contact the first longitudinal beam 110 and the second longitudinal beam 120 in a large area. Compared with limiting the vibration amplitude of the first leaf spring 140 and the second leaf spring 150 by arranging a limiting support on the first longitudinal beam 110 and the second longitudinal beam 120, the contact area between the first leaf spring 140 and the first longitudinal beam 110 and the contact area between the second leaf spring 150 and the second longitudinal beam 120 can be expanded, the probability of stress concentration of the first longitudinal beam 110 and the second longitudinal beam 120 can be reduced, the probability of fracture of the first longitudinal beam 110 and the second longitudinal beam 120 can be reduced, and the service life of the first longitudinal beam 110 and the second longitudinal beam 120 can be prolonged.

[0072] Please refer to Figures 1 to 3 In the embodiment, the rear lower vehicle body 100 further comprises a first buffer block 161 and a second buffer block 171, the first buffer block 161 is fixedly connected with the first leaf spring 140, the second buffer block 171 is fixedly connected with the second leaf spring 150, along the up-down direction Y of the vehicle, the first buffer block 161 is located between the first leaf spring 140 and the first longitudinal beam 110, and the second buffer block 171 is located between the second leaf spring 150 and the second longitudinal beam 120.

[0073] The first buffer block 161 is fixed on the first leaf spring 140, and the first buffer block 161 is located between the first leaf spring 140 and the first longitudinal beam 110, so that when the vehicle vibrates in the up-down direction Y, the first leaf spring 140 does not directly collide with the first longitudinal beam 110, and the first leaf spring 140 collides with the first longitudinal beam 110 through the first buffer block 161, so that the stress of the first longitudinal beam 110 when being impacted can be dispersed, and the service life of the first longitudinal beam 110 is improved.

[0074] The second buffer block 171 is fixed on the second leaf spring 150, and the second buffer block 171 is located between the second leaf spring 150 and the second longitudinal beam 120, so that when the vehicle vibrates in the up-down direction Y, the second leaf spring 150 does not directly collide with the second longitudinal beam 120, and the second leaf spring 150 collides with the second longitudinal beam 120 through the second buffer block 171, so that the stress of the second longitudinal beam 120 when being impacted can be dispersed, and the service life of the second longitudinal beam 120 is improved.

[0075] For example, the first buffer block 161 and the second buffer block 171 can be provided as rubber parts, the rubber material has good elasticity and flexibility, can effectively absorb and buffer impact force, and also has good wear resistance and corrosion resistance, so that the probability of fracture of the first longitudinal beam 110 or the second longitudinal beam 120 can be further reduced, and the service life of the first longitudinal beam 110 or the second longitudinal beam 120 is improved.

[0076] Please refer to Figures 1 to 3 In the embodiment, the rear lower vehicle body 100 further comprises a first support 180 and a first leaf spring lug 200, the first support 180 and the first leaf spring lug 200 are both fixed to the first longitudinal beam 110; along the front-rear direction Z of the vehicle, the first leaf spring 140 has a third end 141 and a fourth end 142 arranged oppositely, the third end 141 is fixed to the first support 180, and the fourth end 142 is fixed to the first leaf spring lug 200.

[0077] The first plate spring 140 has a third end 141 and a fourth end 142 arranged oppositely along the front-rear direction Z of the vehicle, that is, the first plate spring 140 has the third end 141 and the fourth end 142 arranged oppositely along the length direction of the first plate spring 140. The third end 141 is connected with the first bracket 180, and the fourth end 142 is connected with the first plate spring lug 200. For example, the third end 141 can be arranged at the front side of the fourth end 142 along the front-rear direction Z of the vehicle.

[0078] The third end 141 of the first plate spring 140 is fixed to the first bracket 180, and the fourth end 142 is fixed to the first plate spring lug 200 along the front-rear direction Z of the vehicle. The fixed mode of the two ends of the first plate spring 140 provides a stable support point for the first plate spring 140. The first plate spring 140 mainly plays a role of buffering and damping during the driving of the vehicle. Through the reliable fixed mode, the first plate spring 140 can always be kept in the correct position when repeatedly bearing the impact and vibration in the vertical direction of the vehicle, effectively play its buffering and damping function, and ensure the stability and safety of the driving of the vehicle.

[0079] The first plate spring 140 and the first longitudinal beam 110 are connected through the first bracket 180 and the first plate spring lug 200. Compared with connecting the first plate spring 140 and the first longitudinal beam 110 through two first brackets 180, the number of the first bracket 180 is only one in the embodiment, so that the connection cost of the first plate spring 140 and the first longitudinal beam 110 is reduced, and the manufacturing cost of the vehicle is further reduced.

[0080] Please refer to Figures 1 to 3 In the embodiment, the size of the first bracket 180 is greater than the size of the first plate spring lug along the up-down direction Y of the vehicle.

[0081] Since the third end 141 of the first plate spring 140 is connected with the first longitudinal beam 110 through the first bracket 180, and the fourth end 142 is connected with the first longitudinal beam 110 through the first plate spring lug, the size of the first bracket 180 is greater than the size of the first plate spring lug along the up-down direction Y of the vehicle, that is, the distance between the third end 141 and the first longitudinal beam 110 is greater than the distance between the fourth end 142 and the first longitudinal beam 110 along the up-down direction Y of the vehicle.

[0082] For example, the distance between the third end 141 and the first longitudinal beam 110 can be set to 160 mm, the distance between the connection of the first leaf spring 140 and the rear drive axle 130 and the first longitudinal beam 110 can be set to 142 mm, and the distance between the fourth end 142 and the first longitudinal beam 110 can be set to 120 mm in the vertical direction of the vehicle. The roll performance of the vehicle is related to the ground clearance of the first leaf spring 140 or the rear drive axle 130. By setting the position of the first leaf spring 140 as described above, the roll performance of the vehicle can be greatly improved. In addition, the distance between the third end 141 and the first longitudinal beam 110 can be set to 160 mm, the distance between the connection of the first leaf spring 140 and the rear drive axle 130 and the first longitudinal beam 110 can be set to 142 mm, and the distance between the fourth end 142 and the first longitudinal beam 110 can be set to 120 mm. In this way, when the first leaf spring 140 is applied to a vehicle such as a truck, since the fourth end 142 is not provided with a bracket and the third end 141 is provided with a first bracket 180, the position of the third end 141 in the vertical direction will be lower than that of the fourth end 142. In this way, the ground clearance of the cargo box is lower under the condition of ensuring good roll stability of the vehicle, which is convenient for unloading and loading of the truck.

[0083] Specifically, when the vehicle turns, the first leaf spring 140 of the outer wheel (relative to the turning direction) will bear greater pressure. When the first leaf spring 140 is compressed, the reaction force generated is more conducive to resisting the roll of the vehicle. Since the fourth end 142 is higher than the third end 141, the fourth end 142 of the first leaf spring 140 has more deformation space and elastic force during rolling, which can more effectively suppress the roll of the vehicle, so that the vehicle maintains a better posture during turning, improving the safety of driving.

[0084] Please refer to Figures 1 to 3 In the present embodiment, the rear lower vehicle body 100 further comprises a second bracket 190 and a second leaf spring ear 210; the second bracket 190 and the second leaf spring ear 210 are both fixed to the second longitudinal beam 120; the second leaf spring 150 has a fifth end 151 and a sixth end 152 arranged oppositely in the front-rear direction Z of the vehicle, the fifth end 151 is fixed to the second bracket 190, and the sixth end 152 is fixed to the second leaf spring ear 210.

[0085] The second leaf spring 150 has a fifth end 151 and a sixth end 152 arranged oppositely in the front-rear direction Z of the vehicle, that is, the second leaf spring 150 has a fifth end 151 and a sixth end 152 arranged oppositely in the length direction of the second leaf spring 150. The fifth end 151 is connected to the second bracket 190, and the sixth end 152 is connected to the second leaf spring ear 210. For example, the fifth end 151 can be arranged on the front side of the sixth end 152 in the front-rear direction Z of the vehicle.

[0086] In the vehicle front-rear direction Z, the fifth end 151 of the second leaf spring 150 is fixed to the second bracket 190, and the sixth end 152 is fixed to the second leaf spring lug 210, and the two ends of the second leaf spring 150 are fixed in this way to provide a stable support point for the second leaf spring 150. The second leaf spring 150 mainly plays a role of buffering and damping during vehicle driving, and through this reliable fixing method, it can ensure that the second leaf spring 150 always remains in the correct position when repeatedly subjected to vertical impact and vibration of the vehicle, effectively plays its buffering and damping function, and ensures the stability and safety of vehicle driving.

[0087] The second leaf spring 150 and the second longitudinal beam 120 are connected through the second bracket 190 and the second leaf spring lug 210. Compared with arranging two second brackets 190 to connect the second leaf spring 150 and the second longitudinal beam 120, in the embodiment, the number of second brackets 190 is only one, thus reducing the connection cost of the second leaf spring 150 and the second longitudinal beam 120, and further reducing the manufacturing cost of the vehicle.

[0088] Please refer to Figures 1 to 3 In the embodiment, in the vehicle up-down direction Y, the size of the second bracket 190 is greater than the size of the second leaf spring 150 lug.

[0089] Since the fifth end 151 of the second leaf spring 150 is connected to the second longitudinal beam 120 through the second bracket 190, and the sixth end 152 is connected to the second longitudinal beam 120 through the second leaf spring 150 lug, in the vehicle up-down direction Y, the size of the second bracket 190 is greater than the size of the second leaf spring 150 lug, that is, in the vehicle up-down direction Y, the distance between the fifth end 151 and the second longitudinal beam 120 is greater than the distance between the sixth end 152 and the second longitudinal beam 120.

[0090] For example, along the vertical direction of the vehicle, the distance between the fifth end 151 and the second longitudinal beam 120 can be set to 160 mm, the distance between the connection of the second leaf spring 150 and the rear drive axle 130 and the second longitudinal beam 120 can be set to 142 mm, and the distance between the sixth end 152 and the second longitudinal beam 120 can be set to 120 mm. The roll performance of the vehicle is related to the ground clearance of the second leaf spring 150 or the rear drive axle 130. By setting the position of the second leaf spring 150 as described above, the roll performance of the vehicle can be greatly improved. In addition, the distance between the fifth end 151 and the second longitudinal beam 120 can be set to 160 mm, the distance between the connection of the second leaf spring 150 and the rear drive axle 130 and the second longitudinal beam 120 can be set to 142 mm, and the distance between the sixth end 152 and the second longitudinal beam 120 can be set to 120 mm. Thus, when the second leaf spring 150 is applied to a vehicle such as a truck, since the sixth end 152 is not provided with a bracket and the fifth end 151 is provided with a second bracket 190, the position of the fifth end 151 in the vertical direction will be lower than that of the sixth end 152. Thus, under the condition of ensuring good roll stability of the vehicle, the ground clearance of the cargo box is lower, which is convenient for unloading and loading of the truck.

[0091] Specifically, when the vehicle turns, the second leaf spring 150 of the outer wheel (relative to the turning direction) will bear greater pressure. When the second leaf spring 150 is compressed, the direction of the reaction force generated is more conducive to resisting the roll of the vehicle. Since the sixth end 152 is higher than the fifth end 151, the sixth end 152 of the second leaf spring 150 has more deformation space and elastic force during roll, which can more effectively suppress the roll of the vehicle, so that the vehicle can maintain a better posture during turning, and the safety of driving can be improved.

[0092] Please refer to Figures 1 to 4 In the present embodiment, the rear lower vehicle body 100 further comprises a first buffer block bracket 160 and a first leaf spring clamping plate 240, which are arranged on both sides of the first leaf spring 140 along the up-down direction Y of the vehicle. The first buffer block 161 is arranged on the side of the first buffer block bracket 160 away from the first leaf spring 140. The rear lower vehicle body 100 further comprises a first connecting piece 220, which comprises a first bottom rod 221 and two first side rods 222 arranged at the left and right ends of the first bottom rod 221. The first bottom rod 221 abuts against the first buffer block bracket 160, and the ends of the two first side rods 222 away from the first bottom rod 221 are fixed to the first leaf spring clamping plate 240.

[0093] Please refer to Figure 1 、 Figure 5 and Figure 6In the embodiment, the rear lower vehicle body 100 further comprises a first buffer block support 160 and a first leaf spring clamp plate 240, the first leaf spring clamp plate 240 is fixedly connected with the first end 131 of the rear drive axle 130, the first buffer block support 160 and the first leaf spring clamp plate 240 are arranged on both sides of the first leaf spring 140 in the up-down direction Y of the vehicle, and the first buffer block 161 is arranged on the side of the first buffer block support 160 away from the first leaf spring 140; the rear lower vehicle body 100 further comprises a first connecting piece 220, the first connecting piece 220 comprises a first bottom rod 221 and two first side rods 222 arranged at the left end and the right end of the first bottom rod 221, the first bottom rod 221 abuts against the first buffer block support 160, and the end portions of the two first side rods 222 away from the first bottom rod 221 are fixed with the first leaf spring clamp plate 240.

[0094] The first buffer block 161 is arranged on the side of the first buffer block support 160 facing the first longitudinal beam 110, and the first buffer block 161 can be vulcanization-connected with the first buffer block support 160, and the first leaf spring clamp plate 240 can be welded with the first end 131 of the rear drive axle 130. The first bottom rod 221 abuts against the first buffer block support 160, the left end and the right end of the first bottom rod 221 are each provided with a first side rod 222, the end portions of the two first side rods 222 away from the first bottom rod 221 are fixed with the first leaf spring clamp plate 240, the first leaf spring clamp plate 240 can be welded with the first leaf spring 140, and the first leaf spring clamp plate 240 is arranged on the side of the first leaf spring 140 away from the first buffer block support 160, so that the first connecting piece 220 fixes the first leaf spring clamp plate 240, the first buffer block support 160 and the first leaf spring 140 together,

[0095] The first buffer block support 160 and the first leaf spring clamp plate 240 are arranged on both sides of the first leaf spring 140, and then the first buffer block 161 and the first leaf spring clamp plate 240 are fixed by the first connecting piece 220, so that the first leaf spring 140 can be constrained and supported from both sides in the up-down direction Y of the vehicle, so that the first leaf spring 140 can maintain a stable position during driving of the vehicle, reduce shaking and displacement, and enhance the stability of the entire rear lower vehicle body 100 structure.

[0096] The first connecting piece 220 can be a U-shaped bolt, which can apply fastening force to the first leaf spring clamp plate 240 from two directions, and compared with a common bolt, it can more evenly distribute pressure to ensure the stability of the connection. During installation, the fastening force of the U-shaped bolt can be accurately controlled by adjusting the tightening degree of the nut to adapt to the connection requirements of the first leaf spring 140 and the first leaf spring clamp plate 240, and if loosening is found in the connection part during use, the first connecting piece 220 can be conveniently fastened again without replacing the entire first connecting piece 220.

[0097] Specifically, the first buffer block support 160 is fixed on the first leaf spring 140 through the first connecting piece 220, so that the first buffer block support 160 can be firmly fixed on the first leaf spring 140, thereby improving the stability and reliability of the vehicle operation.

[0098] Please refer to Figure 1 、 Figure 5 and Figure 7 In the embodiment, the rear lower vehicle body 100 further comprises a second buffer block support 170 and a second leaf spring clamping plate 250, the second leaf spring clamping plate 250 is fixedly connected with the second end 132 of the rear drive axle 130, the second buffer block support 170 and the second leaf spring clamping plate 250 are arranged on both sides of the second leaf spring 150 in the up-down direction Y of the vehicle, and the second buffer block 171 is arranged on the side of the second buffer block support 170 away from the second leaf spring 150; the rear lower vehicle body 100 further comprises a second connecting piece 230, the second connecting piece 230 comprises a second bottom rod 231 and two second side rods 232 arranged at the left end and the right end of the second bottom rod 231, the second bottom rod 231 abuts against the second buffer block support 170, and the ends of the two second side rods 232 away from the second bottom rod 231 are fixedly connected with the second leaf spring clamping plate 250.

[0099] The second buffer block 171 is arranged on the side of the second buffer block support 170 facing the second longitudinal beam 120, and the second buffer block 171 can be vulcanization connected with the second buffer block support 170, and the second leaf spring clamping plate 250 is welded with the second end 132 of the rear drive axle 130. The second bottom rod 231 abuts against the second buffer block support 170, the left end and the right end of the second bottom rod 231 are provided with the second side rod 232, the ends of the two second side rods 232 away from the second bottom rod 231 are fixedly connected with the second leaf spring clamping plate 250, the second leaf spring clamping plate 250 can be welded with the second leaf spring 150, and the second leaf spring clamping plate 250 is arranged on the side of the second leaf spring 150 away from the second buffer block support 170, so that the second connecting piece 230 fixes the second leaf spring clamping plate 250, the second buffer block support 170 and the second leaf spring 150 together,

[0100] The second buffer block support 170 and the second leaf spring clamping plate 250 are arranged on both sides of the second leaf spring 150, and then the second buffer block 171 and the second leaf spring clamping plate 250 are fixed through the second connecting piece 230, so that the second leaf spring 150 can be constrained and supported from both sides in the up-down direction Y of the vehicle, so that the second leaf spring 150 can maintain a stable position during the driving of the vehicle, reduce the shaking and displacement, and enhance the stability of the entire rear lower vehicle body 100 structure.

[0101] Exemplarily, the second connecting member 230 can be configured as a U-shaped bolt capable of exerting fastening force on the second leaf spring clamp 250 from two directions, which can more evenly distribute pressure compared with ordinary bolts, ensuring the stability of the connection. During installation, the fastening force of the U-shaped bolt can be accurately controlled by adjusting the tightening degree of the nut to adapt to the connection requirements of the second leaf spring 150 and the second leaf spring clamp 250. If loosening is found in the connection part during use, it can also be conveniently re-tightened without the need to replace the entire second connecting member 230.

[0102] Specifically, the second connecting member 230 can firmly fix the second buffer block support 170 on the second leaf spring 150, improving the stability and reliability of vehicle operation.

[0103] Please refer to Figures 1 to 7 In the embodiment, the first side rod 222 is provided with a first thread 223 at one end away from the first bottom rod 221, and the second side rod 232 is provided with a second thread 233 at one end away from the second bottom rod 231; the first connecting member 220 includes a first nut 224, and the second connecting member 230 includes a second nut 234, the first side rod 222 is threaded with the first nut 224 through the first leaf spring clamp 240, and the second side rod 232 is threaded with the second nut 234 through the second leaf spring clamp 250.

[0104] The first side rod 222 is threaded with the first nut 224 through the first leaf spring clamp 240, and the first leaf spring clamp 240 is located between the first bottom rod 221 and the first nut 224. The second side rod 232 is threaded with the second nut 234 through the second leaf spring clamp 240, and the second leaf spring clamp 240 is located between the second bottom rod 231 and the second nut 234. The first side rod 222 is threaded with the first nut 234 through the first leaf spring clamp 240, and the second side rod 232 is threaded with the second nut 234 through the second leaf spring clamp 250. On the one hand, this can fix the first connecting member 220 and the first leaf spring clamp 240, and fix the second connecting member 230 and the second leaf spring clamp 250, improving the safety and reliability of the vehicle as a whole. On the other hand, when parts need to be repaired, the first connecting member 220 and the first leaf spring clamp 240, and the second connecting member 230 and the second leaf spring clamp 250 can be conveniently disassembled, improving the repair efficiency.

[0105] Please refer to Figures 1 to 5In the embodiment, the rear lower vehicle body 100 further comprises a first reinforcing plate 260 and a second reinforcing plate 270, the first reinforcing plate 260 is arranged on the first longitudinal beam 110, and the second reinforcing plate 270 is arranged on the second longitudinal beam 120; at least part of the first reinforcing plate 260 is located between the first longitudinal beam 110 and the first buffer block 161 along the up-down direction Y of the vehicle, and at least part of the second reinforcing plate 270 is located between the second longitudinal beam 120 and the second buffer block 171.

[0106] At least part of the first reinforcing plate 260 is arranged between the first longitudinal beam 110 and the first buffer block 161, that is, at least part of the projection of the first reinforcing plate 260 coincides with the first buffer block 161 along the up-down direction Y of the vehicle, when the first buffer block 161 vibrates up and down, the first buffer block 161 will not directly impact the first longitudinal beam 110, the first buffer block 161 impacts the first reinforcing plate 260, the first reinforcing plate 260 can play a transitional buffering role between the first longitudinal beam 110 and the first buffer block 161, disperse and absorb the impact force of the first buffer block 161 to the first longitudinal beam 110, improve the buffering effect, reduce the stress concentration of the impact force to the first longitudinal beam 110, reduce the probability of fatigue damage of the first longitudinal beam 110, prolong the service life and use effect of the first longitudinal beam 110.

[0107] At least part of the second reinforcing plate 270 is arranged between the second longitudinal beam 120 and the second buffer block 171, that is, at least part of the projection of the second reinforcing plate 270 coincides with the second buffer block 171 along the up-down direction Y of the vehicle, when the second buffer block 171 vibrates up and down, the second buffer block 171 will not directly impact the second longitudinal beam 120, the second buffer block 171 impacts the second reinforcing plate 270, the second reinforcing plate 270 can play a transitional buffering role between the second longitudinal beam 120 and the second buffer block 171, disperse and absorb the impact force of the second buffer block 171 to the second longitudinal beam 120, improve the buffering effect, reduce the stress concentration of the impact force to the second longitudinal beam 120, reduce the probability of fatigue damage of the second longitudinal beam 120, prolong the service life and use effect of the second longitudinal beam 120.

[0108] Specifically, at least part of the first reinforcing plate 260 is located between the first longitudinal beam 110 and the first buffer block 161 along the up-down direction Y of the vehicle, and at least part of the second reinforcing plate 270 is located between the second longitudinal beam 120 and the second buffer block 171, which can reduce the probability of fatigue damage of the first longitudinal beam 110 and the second longitudinal beam 120.

[0109] Please refer to Figures 1 to 7 The embodiment of the application further provides a vehicle, which comprises the rear lower vehicle body 100 of any one of the embodiments of the application.

[0110] The vehicle provided by the embodiment of the present application sets the first leaf spring 140 between the first longitudinal beam 110 and the first drive axle, and sets the second leaf spring 150 between the second longitudinal beam 120 and the first drive axle. In this way, when the vehicle vibrates, on the one hand, the first leaf spring 140 and the second leaf spring 150 can be closer to the first longitudinal beam 110 and the second longitudinal beam 120, thereby reducing the vibration amplitude of the first leaf spring 140 and the second leaf spring 150 in the vertical direction of the vehicle; on the other hand, the first leaf spring 140 and the second leaf spring 150 can directly contact the first longitudinal beam 110 and the second longitudinal beam 120 in a large area. Compared with limiting the vibration amplitude of the first leaf spring 140 and the second leaf spring 150 by setting a limiting support on the first longitudinal beam 110 and the second longitudinal beam 120, the contact area of the first leaf spring 140 and the second leaf spring 150 with the first longitudinal beam 110 and the second longitudinal beam 120 can be enlarged, the probability of stress concentration of the first longitudinal beam 110 and the second longitudinal beam 120 can be reduced, the probability of fracture of the first longitudinal beam 110 and the second longitudinal beam 120 can be reduced, and the service life of the first longitudinal beam 110 and the second longitudinal beam 120 can be prolonged.

[0111] It should also be noted that the terms "comprising", "containing", or any other similar term are intended to encompass non-exclusive inclusions, such that a process, method, article, or apparatus that comprises a list of elements does not necessarily include only those elements, but can include other elements not expressly listed, or can include elements inherent in such process, method, article, or apparatus. Without more limitations, the element defined by the phrase "comprising a" does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0112] Each of the embodiments in the specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other. Each embodiment focuses on the difference from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the part of the method embodiment.

[0113] The above only describes the embodiments of the present application and is not intended to limit the present application. The present application can have various modifications and changes for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of the claims of the present application.

[0114] Although the embodiments of the present application are described in conjunction with the drawings, those skilled in the art can make various modifications and changes without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope defined by the appended claims.

Claims

1. A rear lower vehicle body characterized by comprising: The application relates to a rear lower vehicle body of a vehicle, which comprises: a first longitudinal beam and a second longitudinal beam, which are arranged in a left-right direction of the vehicle and are spaced apart; a rear drive axle, which is arranged below the first longitudinal beam and the second longitudinal beam in an up-down direction of the vehicle, has a first end and a second end in the left-right direction of the vehicle, and is provided with a first plate spring and a second plate spring in the up-down direction of the vehicle; the first plate spring is arranged between the first end and the first longitudinal beam and the first end is mounted on the first longitudinal beam through the first plate spring, and the second plate spring is arranged between the second end and the second longitudinal beam and the second end is mounted on the second longitudinal beam through the second plate spring.

2. The rear lower vehicle body according to claim 1, characterized by The rear lower vehicle body further comprises a first buffer block and a second buffer block, the first buffer block is fixedly connected with the first plate spring, the second buffer block is fixedly connected with the second plate spring, the first buffer block is located between the first plate spring and the first longitudinal beam in the up-down direction of the vehicle, and the second buffer block is located between the second plate spring and the second longitudinal beam in the up-down direction of the vehicle.

3. The rear lower vehicle body according to claim 1, characterized by The rear lower vehicle body further comprises a first support and a first plate spring lug, and the first support and the first plate spring lug are fixed to the first longitudinal beam; the first plate spring has a third end and a fourth end which are oppositely arranged in the front-rear direction of the vehicle, the third end is fixed to the first support, and the fourth end is fixed to the first plate spring lug.

4. The rear lower vehicle body according to claim 3, characterized by The size of the first support is greater than that of the first plate spring lug in the up-down direction of the vehicle.

5. The rear lower vehicle body according to claim 1, characterized by The rear lower vehicle body further comprises a second support and a second plate spring lug, and the second support and the second plate spring lug are fixed to the second longitudinal beam; the second plate spring has a fifth end and a sixth end which are oppositely arranged in the front-rear direction of the vehicle, the fifth end is fixed to the second support, and the sixth end is fixed to the second plate spring lug. The size of the second support is greater than that of the second plate spring lug in the up-down direction of the vehicle.

6. The rear lower vehicle body according to claim 1, characterized by The rear lower vehicle body further comprises a first buffer block support and a first plate spring clamping plate, the first plate spring clamping plate is fixedly connected with the first end of the rear drive axle, the first buffer block support and the first plate spring clamping plate are arranged on both sides of the first plate spring in the up-down direction of the vehicle, and the first buffer block is arranged on a side of the first buffer block support which is away from the first plate spring; the rear lower vehicle body further comprises a first connecting piece, the first connecting piece comprises a first bottom rod and two first side rods which are arranged at left and right ends of the first bottom rod, the first bottom rod abuts against the first buffer block support, and the ends of the two first side rods which are away from the first bottom rod are fixed to the first plate spring clamping plate.

7. The rear lower vehicle body according to claim 6, characterized by The rear lower vehicle body further comprises a second buffer block support and a second plate spring clamping plate, the second plate spring clamping plate is fixedly connected with the second end of the rear drive axle, the second buffer block support and the second plate spring clamping plate are arranged on both sides of the second plate spring in the up-down direction of the vehicle, and the second buffer block is arranged on a side of the second buffer block support which is away from the second plate spring. The rear lower vehicle body further comprises a second connecting member, the second connecting member comprises a second bottom rod and two second side rods arranged at left and right ends of the second bottom rod, the second bottom rod abuts against the second buffer block support, and the two second side rods are fixed to the second leaf spring clamping plate at ends away from the second bottom rod.

8. The rear lower vehicle body according to claim 7, characterized by An end of the first side rod away from the first bottom rod is provided with a first thread, and an end of the second side rod away from the second bottom rod is provided with a second thread. The first connecting member comprises a first nut, the second connecting member comprises a second nut, the first side rod is screwed with the first nut through the first leaf spring clamping plate, and the second side rod is screwed with the second nut through the second leaf spring clamping plate.

9. The rear lower vehicle body according to claim 1, characterized by The rear lower vehicle body further comprises a first reinforcing plate and a second reinforcing plate, the first reinforcing plate is arranged at the first longitudinal beam, and the second reinforcing plate is arranged at the second longitudinal beam. In the up-down direction of the vehicle, at least part of the first reinforcing plate is located between the first longitudinal beam and the first buffer block, and at least part of the second reinforcing plate is located between the second longitudinal beam and the second buffer block.

10. A vehicle characterized by comprising: A rear lower vehicle body of a vehicle as claimed in any one of claims 1-9.

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