Lower frame assembly and vehicle

Abstract

The utility model discloses a lower frame assembly and a vehicle, and relates to the technical field of vehicles. The lower frame assembly comprises a longitudinal beam, a water tank frame mounting structure and a water tank frame assembly, the water tank frame mounting structure comprises a first mounting plate and a second mounting plate which are connected, the first mounting plate is vertically arranged and located at the front end of the longitudinal beam, and the second mounting plate is located on at least one side of the longitudinal beam and connected to the longitudinal beam through a fastener; the water tank frame assembly is located on the front side of the longitudinal beam, abuts against the first mounting plate and is connected with the first mounting plate. According to the lower frame assembly provided by the embodiment of the utility model, the installation accuracy of the water tank frame assembly and the longitudinal beam is improved, and the connection stability is further improved.

Description

TECHNICAL FIELD

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

[0002] In the existing assembly process, the water tank frame is usually hoisted to a predetermined position and preliminarily positioned with the aid of a tool, and then connected to the longitudinal beam using bolts, and then the front end module including the front bumper, fender and front combination lamp is installed. However, due to factors such as tolerance accumulation between parts, assembly errors and material deformation, this process often results in insufficient final assembly accuracy, affecting the performance and appearance quality of the vehicle.

[0003] Therefore, how to improve the installation accuracy between the water tank frame and the longitudinal beam has become a technical problem to be solved. CONTENT OF THE UTILITY MODEL

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the first aspect of the present application aims to provide a lower frame assembly which helps to improve the installation accuracy of the water tank frame assembly and the longitudinal beam, thereby improving the connection stability.

[0005] The second aspect of the present application aims to provide a vehicle.

[0006] According to the lower frame assembly of the first aspect of the present application, the lower frame assembly comprises a longitudinal beam, a water tank frame mounting structure and a water tank frame assembly, the water tank frame mounting structure comprises a first mounting plate and a second mounting plate connected together, the first mounting plate is vertically arranged and located at the front end of the longitudinal beam, the second mounting plate is located at least one side of the longitudinal beam, and the second mounting plate is connected to the longitudinal beam by a fastener; the water tank frame assembly is located on the front side of the longitudinal beam, the water tank frame assembly abuts against the first mounting plate, and is connected to the first mounting plate.

[0007] According to the lower frame assembly of the present application, the water tank frame mounting structure is provided to realize the stable connection of the water tank frame assembly and the longitudinal beam. Specifically, the water tank frame mounting structure comprises two mounting plates, one of which is connected to the water tank frame assembly, and the other of which is connected to the longitudinal beam, and the face contact of the two mounting plates improves the connection reliability.

[0008] According to the lower frame assembly of some embodiments of the present application, the first mounting plate is provided with at least three non-collinear connecting parts, and the water tank frame assembly is connected to at least three connecting parts.

[0009] In some optional embodiments, the first mounting plate is provided with one connecting part at each corner, and the connecting part is a threaded hole.

[0010] According to some embodiments of the present invention, the lower frame assembly has a positioning hole on the first mounting plate and a positioning protrusion for inserting into the positioning hole at the front end of the longitudinal beam.

[0011] In some alternative embodiments, at least two of the positioning holes are arranged diagonally opposite the first mounting plate.

[0012] According to some embodiments of the present invention, the underframe assembly includes a clearance through hole on the first mounting plate, which is located above the second mounting plate and the longitudinal beam. The underframe assembly also includes a crash beam, which is pre-installed on the water tank frame assembly via pre-installed bolts passing through the clearance through hole.

[0013] In some optional embodiments, the first mounting hole includes: a motherboard face area and a top plate face area, the motherboard face area being rectangular, and the second mounting plate being connected to the back of the motherboard face area; the top plate face area being rectangular and connected to the upper end of the motherboard face area, the width of the top plate face area being smaller than that of the motherboard face area, and the clearance through hole being located on the top plate face area.

[0014] According to some embodiments of the present invention, the second mounting plate includes: a middle plate area and two side plate areas, the middle plate area being connected to the back of the first mounting plate; the two side plate areas being connected to the horizontal sides of the middle plate area, and the two side plate areas being respectively connected to the longitudinal beam by fasteners.

[0015] Optionally, the first mounting plate has a weight-reducing hole at its center, and the intermediate plate area is welded to the first mounting plate; there is a weld between the intermediate plate area and the first mounting plate, and the weld is located on at least two sides of the weight-reducing hole.

[0016] The vehicle according to a second aspect of the present invention includes the underframe assembly described in the first aspect of the present invention.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0019] Figure 1 This is a schematic diagram of the lower frame assembly in some embodiments of the present invention;

[0020] Figure 2This is a schematic diagram showing the connection between the water tank frame installation structure and the longitudinal beam in some embodiments of this utility model;

[0021] Figure 3 This is a schematic diagram of the structure of the first mounting plate in some embodiments of the present invention;

[0022] Figure 4 This is an exploded view of the water tank frame installation structure in some embodiments of this utility model;

[0023] Figure 5 This is a schematic diagram showing the cooperation between the first mounting plate and the second mounting plate in some embodiments of this utility model.

[0024] Figure label:

[0025] The following components are included: underframe assembly 100, longitudinal beam 10, water tank frame mounting structure 20, first mounting plate 21, connecting part 211, positioning hole 212, weight reduction hole 213, clearance through hole 214, weld 215, main plate surface area 2101, top plate surface area 2102, second mounting plate 23, middle plate area 231, side plate area 232, water tank frame assembly 30, and anti-collision beam 40. Detailed Implementation

[0026] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0027] In the description of this utility model, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] The following is for reference. Figures 1-5 The following describes a lower frame assembly 100 according to a first aspect embodiment of the present invention.

[0030] like Figure 1 As shown, the underframe assembly 100 according to an embodiment of the present utility model includes: a longitudinal beam 10, a water tank frame mounting structure 20, and a water tank frame assembly 30.

[0031] The longitudinal beam 10, as one of the main load-bearing and supporting structures of the vehicle chassis, provides a stable mounting point for the lower frame assembly 100. The radiator frame assembly 30 is used to fix the automotive radiator, i.e., the water tank, ensuring that the water tank remains stable during vehicle operation. In this application, the radiator frame assembly 30 is mounted on one end of the longitudinal beam 10 via the radiator frame mounting structure 20.

[0032] Combination Figure 2 The water tank frame mounting structure 20 includes a first mounting plate 21 and a second mounting plate 23 connected together. The first mounting plate 21 is vertically arranged and located at the front end of the longitudinal beam 10. The second mounting plate 23 is located on at least one side of the longitudinal beam 10 and is connected to the longitudinal beam 10 by fasteners. The water tank frame assembly 30 is located on the front side of the longitudinal beam 10, abuts against the first mounting plate 21, and is connected to the first mounting plate 21.

[0033] Here, the first mounting plate 21 serves as the main support surface for the water tank frame assembly 30, used for mounting the water tank frame assembly 30. Simultaneously, the first mounting plate 21 provides a stable vertical support point for the water tank frame assembly 30. Since the first mounting plate 21 is placed vertically and located at the front end of the longitudinal beam 10, it provides a clear reference surface for the water tank frame assembly 30. This means that during installation, precise positioning of the water tank frame assembly 30 relative to the longitudinal beam 10 can be achieved more easily. Furthermore, the first mounting plate 21 and the water tank frame assembly 30 have surface contact, therefore, the connection between them has high reliability.

[0034] By mounting the second mounting plate 23 on one or more sides of the longitudinal beam 10 and securing it with fasteners, movement of the water tank frame assembly 30 can be restricted at multiple locations. This not only improves the accuracy of individual mounting points but also further enhances the overall installation accuracy due to the presence of multiple constraints. Simultaneously, the second mounting plate 23 and the longitudinal beam 10 have surface contact, thus ensuring high connection reliability between them.

[0035] When the water tank frame assembly 30 abuts against and connects to the first mounting plate 21, some potential manufacturing tolerances or assembly errors are limited to a smaller range. Here, the first mounting plate 21 can serve as a common reference surface, allowing all subsequent assembly operations to be performed based on this fixed reference, thereby reducing the possibility of accumulated errors.

[0036] Finally, by connecting the first mounting plate 21 and the second mounting plate 23, the water tank frame assembly 30 is accurately installed on the longitudinal beam 10.

[0037] Alternatively, the fastener can be a bolt, screw, etc.

[0038] In some optional embodiments, the first mounting plate 21 and the second mounting plate 23 can be connected by means of snap-fit ​​connection, welding connection, bolt connection, rivet connection, or by a combination of any two or more of the above connection methods.

[0039] It is worth noting that currently, some radiator frames are connected to longitudinal beams using bolts. In this process, the radiator frame is first hoisted onto the longitudinal beam using tooling for initial positioning. Then, bolts are used to connect the radiator frame's mounting structure to the longitudinal beam, and screws are used to secure it to the radiator frame. Subsequently, other components, such as the front bumper, fenders, and front combination lights, are pre-installed using tooling. After all components are pre-installed, a recalibration is performed. If any inaccuracies are found, the bolts must be loosened, adjusted accordingly, and then retightened to ensure that all components are properly installed. In contrast, the radiator frame mounting structure proposed in this application adopts a double mounting plate design. These two mounting plates contact the radiator frame and longitudinal beam surfaces respectively, increasing the contact area and improving the reliability of the connection. At the same time, this design also reduces the difficulty of adjustment to some extent, providing a new solution for the installation of automotive radiator frames.

[0040] According to some such Figure 3 In the embodiment shown, the first mounting plate 21 is provided with at least three non-collinear connecting parts 211, and the water tank frame assembly 30 is connected to the at least three connecting parts 211.

[0041] By providing at least three non-collinear connecting parts 211 on the first mounting plate 21, the precise spatial positioning of the water tank frame assembly 30 can be ensured. Furthermore, multi-point connections effectively reduce cumulative errors during assembly. Each connecting point can serve as an independent reference point, ensuring precise alignment of all parts of the water tank frame assembly 30. Even if a slight deviation exists at one connecting point, other connecting points can compensate for it. Therefore, precise alignment between the water tank frame assembly 30 and the longitudinal beam 10 can still be guaranteed.

[0042] Furthermore, the three non-collinear connecting parts 211 together form a stable triangular support structure, which has high rigidity and resistance to deformation. Compared with single-point or two-point connections, the three-point connection can better resist the action of external forces, further preventing the water tank frame assembly 30 from shifting or shaking during vehicle operation.

[0043] Optionally, the connection 211 may include a gasket. By providing a gasket, fine adjustments to the position of the tank frame assembly 30 can be made after installation to achieve an optimal installation.

[0044] Optionally, rubber pads or other vibration-damping materials may be added between the connection portions 211. This helps absorb vibrations and shocks, protecting the tank frame assembly 30 and its internal components from damage.

[0045] In some alternative embodiments, combined with Figure 3 Each of the four corners of the first mounting plate 21 is provided with a connecting part 211, and the connecting part 211 is a threaded hole.

[0046] By setting threaded holes at the four corners of the first mounting plate 21, a rectangular support structure is formed, providing more constraint points, which can better resist torsional and lateral forces, thereby enhancing the rigidity and stability of the entire system.

[0047] The four connection points allow for a more even distribution of weight and stress from the tank frame assembly 30, thereby reducing pressure on individual connection points and lowering the risk of structural deformation or damage due to localized stress concentration. This uniform load distribution also contributes to extending service life to some extent.

[0048] Meanwhile, the threaded hole design makes it easier to disassemble and assemble the water tank frame assembly 30.

[0049] According to some optional embodiments, in combination Figure 3 The first mounting plate 21 is provided with a positioning hole 212, and the front end of the longitudinal beam 10 is provided with a positioning protrusion for inserting into the positioning hole 212.

[0050] Specifically, by inserting the positioning protrusion into the positioning hole 212, the longitudinal beam 10 and the water tank frame assembly 30 can be initially and accurately positioned, avoiding deviations that may occur during manual alignment.

[0051] After the positioning protrusion is inserted into the positioning hole 212, it not only achieves precise positioning but also provides a certain degree of initial fixation. This makes subsequent connections easier and reduces installation difficulties caused by component movement. In addition, the initial fixation can prevent the water tank frame assembly 30 from shifting during transportation or handling, protecting the stability of the installed components.

[0052] This method of assembly enables precise alignment and initial fixation between the water tank frame assembly 30 and the longitudinal beam 10, thereby improving installation accuracy and efficiency.

[0053] Optionally, the positioning hole 212 is circular, and the positioning protrusion is also circular and adapted to fit the positioning hole 212. Alternatively, the positioning hole 212 can also be elliptical, square, or polygonal. These shapes of positioning holes 212 ensure that the water tank frame assembly 30 is in the predetermined orientation after installation, preventing installation deviation.

[0054] Depending on specific requirements, one or more positioning holes 212 can be provided on the first mounting plate 21, and correspondingly, the same number of positioning protrusions should also be provided on the front end of the longitudinal beam 10. Generally, providing two or more positioning holes 212 can provide higher positioning accuracy and stability.

[0055] The positioning hole 212 and the positioning protrusion can be made of high-strength steel, aluminum alloy, etc. These materials have a certain strength and wear resistance to ensure that they will not deform or wear during long-term use, thereby improving service life.

[0056] In some alternative embodiments, at least two positioning holes 212 are arranged diagonally on the first mounting plate 21.

[0057] In the above technical solution, at least two positioning holes 212 are set on a diagonal of the first mounting plate 21. The position of the water tank frame assembly 30 on the first mounting plate 21 can be uniquely determined by the two points on the diagonal, avoiding the positioning error that may be caused by setting the positioning holes 212 on one side or in parallel.

[0058] Meanwhile, the diagonally arranged positioning holes 212 can better resist torsional and lateral forces. Compared with parallel positioning holes 212, the diagonal arrangement can enhance the connection stability between the water tank frame assembly 30 and the first mounting plate 21. Especially when the vehicle encounters bumps or turns during driving, this arrangement can effectively prevent the water tank frame assembly 30 from shifting or shaking.

[0059] According to some embodiments, the lower frame assembly 100, such as Figure 1 , Figure 3 As shown, the first mounting plate 21 is provided with a clearance through hole 214, which is located above the second mounting plate 23 and the longitudinal beam 10. The lower frame assembly 100 also includes a crash beam 40, which is pre-installed on the water tank frame assembly 30 by pre-installed bolts, which pass through the clearance through hole 214.

[0060] In the above technical solution, the setting of the avoidance through hole 214 provides installation space for the pre-installed bolts of the anti-collision beam 40, ensuring that the bolts can pass smoothly through the first mounting plate 21 and be connected to the water tank frame assembly 30.

[0061] The presence of the clearance through-hole 214 allows the anti-collision beam 40 to be pre-connected to the water tank frame assembly 30 before installation, forming a single module. The entire module can then be installed onto the first mounting plate 21 via the clearance through-hole 214, thus simplifying the assembly process.

[0062] Specifically, the pre-installed connection between the clearance through-hole 214 and the anti-collision beam 40 ensures precise alignment between the radiator and the anti-collision beam 40 in the vehicle, avoiding potential reduction in cooling effect or failure of the anti-collision beam 40 due to installation deviations.

[0063] In the vehicle's engine compartment, the pre-installed design of the avoidance through-hole 214 and the anti-collision beam 40 can optimize space utilization, ensure precise alignment of multiple components, and thus improve the overall performance and reliability of the vehicle.

[0064] In some alternative embodiments, such as Figures 3-4 As shown, the first mounting hole includes a motherboard surface area 2101 and a top plate surface area 2102. The motherboard surface area 2101 is rectangular, and the second mounting plate 23 is connected to the back of the motherboard surface area. The top plate surface area 2102 is rectangular and connected to the upper end of the motherboard surface area 2101. The width of the top plate surface area 2102 is smaller than that of the motherboard surface area 2101, and the clearance through hole 214 is located on the top plate surface area 2102.

[0065] Therefore, by installing the water tank frame assembly 30 and the second mounting plate 23 on both sides of the first mounting plate 21, space can be effectively utilized and installation interference can be reduced.

[0066] The width of the top plate area 2102 is smaller than that of the main plate area 2101, making the upper structure of the entire first mounting plate 21 more compact and avoiding space occupation.

[0067] By setting the avoidance through hole 214 in the top plate surface area 2102, the number of connection points on the main plate surface area 2101 is reduced, thereby avoiding mutual interference between multiple mounting points and more rationally distributing the load from the anti-collision beam 40 and the water tank frame assembly 30.

[0068] Optionally, the main plate surface area 2101 and the top plate surface area 2102 are integrated as a single piece. This avoids seams and connection points, thereby improving the structural rigidity and integrity of the entire first mounting plate 21 and enhancing the stability of the water tank frame mounting structure 20.

[0069] In some alternative embodiments, see Figure 3 The motherboard surface area 2101 is provided with: connecting parts 211 and positioning holes 212. There are four connecting parts 211, which are located at the four corners of the motherboard surface area 2101, and the connecting parts 211 are threaded holes. The two positioning holes 212 are set diagonally corresponding to the motherboard surface area 2101.

[0070] In some other embodiments, there are two positioning holes 212, with one positioning hole 212 located in the main board surface area 2101 and the other positioning hole 212 located in the top plate surface area 2102.

[0071] Optionally, see Figure 3 The first mounting plate 21 is provided with four connecting parts 211, one of which is located in the top plate surface area 2102, and the other three are located in the main plate surface area 2101. The three connecting parts 211 are respectively located in the three corners of the main plate surface area 2101 away from the top plate surface area 2102.

[0072] In some embodiments, see Figure 4 The second mounting plate 23 includes a middle plate area 231 and two side plate areas 232. The middle plate area 231 is connected to the back of the first mounting plate 21. The two side plate areas 232 are connected to the horizontal sides of the middle plate area 231, and the two side plate areas 232 are respectively connected to the longitudinal beam 10 by fasteners.

[0073] The two side plate areas 232 are separately set on both sides of the middle plate area 231 to form a double-sided support structure, which enhances the lateral stability of the water tank frame assembly 30, can better resist the action of external forces, prevent deformation or damage caused by vibration or impact, and ensure the connection stability between the second mounting plate 23 and the longitudinal beam 10.

[0074] The side plate area 232 is connected to the longitudinal beam 10 by multiple fasteners, providing more constraint points and ensuring precise alignment between the second mounting plate 23 and the longitudinal beam 10. This multi-point fixing method can reduce positioning errors during installation, thereby ensuring the installation accuracy of the underframe assembly 100.

[0075] Optionally, the fasteners can be bolts, screws, etc. The side plate area 232 is connected to the longitudinal beam 10 by bolts, screws, etc., to ensure the reliability of the connection and seismic performance.

[0076] Optionally, see Figures 3-5The first mounting plate 21 has a weight reduction hole 213 at its center.

[0077] By setting the weight reduction hole 213, the amount of material used in the first mounting plate 21 can be reduced, thereby reducing the weight of the entire lower frame assembly 100, which helps to achieve the vehicle's lightweight goal and thus improves the vehicle's fuel efficiency and handling.

[0078] The intermediate plate area 231 is welded to the first mounting plate 21. This creates a robust connection, ensuring a stable bond between the intermediate plate area 231 and the first mounting plate 21. Simultaneously, the welded connection provides good shock resistance, absorbing vibrations and impacts during vehicle operation and protecting the connection portion 211 from damage. This not only improves the reliability of the lower frame assembly 100 but also extends its service life.

[0079] Optionally, the weight-reducing hole 213 can be circular or elliptical. By making the weight-reducing hole 213 circular or elliptical, its edges can be ensured to be smooth, avoiding stress concentration. At the same time, circular or elliptical weight-reducing holes 213 are easier to process, reducing manufacturing costs. Of course, the weight-reducing hole 213 can also be other shapes, or set according to requirements.

[0080] Combination Figure 5 A weld 215 is provided between the intermediate plate area 231 and the first mounting plate 21, and the weld 215 is located on at least both sides of the weight reduction hole 213. This can enhance the local rigidity around the weight reduction hole 213, and the weld 215 can disperse stress and prevent deformation or damage caused by local stress concentration.

[0081] The vehicle according to a second aspect of the present invention includes: a lower frame assembly 100 according to a first aspect of the present application.

[0082] It is worth noting that the specific type of vehicle referred to in this application is not limited. For example, the vehicle can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, fuel cell electric vehicles, range-extended electric vehicles, solar-powered electric vehicles, gas fuel vehicles (such as hydrogen engine vehicles), or biofuel vehicles (such as vehicles powered by ethanol, biodiesel, etc.). The vehicle according to this utility model embodiment, utilizing the improved lower frame assembly 100, facilitates improved installation accuracy of the water tank frame assembly 30 within the vehicle, thereby improving manufacturing efficiency.

[0083] The following is for reference. Figure 1 - Figure 5 The lower frame assembly 100 according to a specific embodiment of the present invention is described in detail below. It is to be understood that the following description is merely illustrative and not intended to limit the scope of the invention.

[0084] Reference Figure 1 The lower frame assembly 100 includes: longitudinal beam 10, water tank frame mounting structure 20, water tank frame assembly 30, and anti-collision beam 40.

[0085] Reference Figure 2 The water tank frame mounting structure 20 includes: a first mounting plate 21 and a second mounting plate 23 connected together.

[0086] The first mounting plate 21 is vertically positioned and located at the front end of the longitudinal beam 10.

[0087] The second mounting plate 23 is located on at least one side of the longitudinal beam 10 and is connected to the longitudinal beam 10 by fasteners.

[0088] The water tank frame assembly 30 is located on the front side of the longitudinal beam 10. The water tank frame assembly 30 abuts against the first mounting plate 21 and is connected to the first mounting plate 21.

[0089] Reference Figure 3 The first mounting plate 21 includes: a main plate surface area 2101 and a top plate surface area 2102.

[0090] The motherboard face area 2101 is rectangular, and the second mounting plate 23 is connected to the back of the motherboard face area.

[0091] The top plate area 2102 is rectangular and connected to the upper end of the main plate area 2101. The width of the top plate area 2102 is smaller than that of the main plate area 2101.

[0092] The first mounting plate 21 is provided with: a connecting part 211, a positioning hole 212, a weight reduction hole 213 and a clearance through hole 214.

[0093] There are two positioning holes 212, one of which is located on the main board surface area 2101 and the other is located on the top plate surface area 2102.

[0094] There are four connecting parts 211, one of which is located in the top plate surface area 2102, and the other three connecting parts 211 are located in the main plate surface area 2101, and the three connecting parts 211 are respectively located at the three corners of the main plate surface area 2101 away from the top plate surface area 2102. The connecting parts 211 are threaded holes.

[0095] The water tank frame assembly 30 is connected to four connecting parts 211.

[0096] The motherboard face area 2101 has two positioning holes 212, which are set on the diagonal of the motherboard face area 2101.

[0097] The front end of the longitudinal beam 10 is provided with a positioning protrusion for inserting positioning holes 212.

[0098] The weight reduction hole 213 is located at the center of the first mounting plate 21.

[0099] The avoidance through hole 214 is located in the top plate surface area 2102 and above the second mounting plate 23 and the longitudinal beam 10.

[0100] Reference Figure 1 The anti-collision beam 40 is pre-installed on the water tank frame assembly 30 by pre-installed bolts, which are inserted through the clearance through hole 214.

[0101] Reference Figure 4 The second mounting plate 23 includes a middle plate area 231 and two side plate areas 232. The middle plate area 231 is welded to the first mounting plate 21 and is located on the back of the first mounting plate 21.

[0102] Two side plate areas 232 are connected to the horizontal sides of the middle plate area 231, and the two side plate areas 232 are respectively connected to the longitudinal beam 10 by fasteners.

[0103] Reference Figure 5 There is a weld 215 between the intermediate plate area 231 and the first mounting plate 21, and the weld 215 is located on both sides of the weight reduction hole 213.

[0104] Other components of the lower frame assembly 100 according to the present invention, such as the vehicle itself, and its operation are known to those skilled in the art and will not be described in detail here.

[0105] In this specification, the terms "embodiment," "example," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0106] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A lower frame assembly, characterized in that, include: Longitudinal beam; A water tank frame mounting structure includes a first mounting plate and a second mounting plate connected together. The first mounting plate is vertically arranged and located at the front end of the longitudinal beam. The second mounting plate is located on at least one side of the longitudinal beam and is connected to the longitudinal beam by fasteners. A water tank frame assembly is located on the front side of the longitudinal beam, abutting against the first mounting plate and connected to the first mounting plate.

2. The underframe assembly according to claim 1, characterized in that, The first mounting plate is provided with at least three non-collinear connection parts, and the water tank frame assembly is connected to at least three of the connection parts.

3. The lower frame assembly according to claim 2, characterized in that, The first mounting plate has a connecting part at each of its four corners, and the connecting part is a threaded hole.

4. The lower frame assembly according to claim 1, characterized in that, The first mounting plate is provided with positioning holes, and the front end of the longitudinal beam is provided with positioning protrusions that are inserted into the positioning holes.

5. The underframe assembly according to claim 4, characterized in that, At least two of the positioning holes are arranged along a diagonal line of the first mounting plate.

6. The underframe assembly according to claim 1, characterized in that, The first mounting plate is provided with a clearance through hole, which is located above the second mounting plate and the longitudinal beam; The lower frame assembly also includes a crash beam, which is pre-installed on the water tank frame assembly by pre-installed bolts, which pass through the clearance hole.

7. The underframe assembly according to claim 6, characterized in that, The first mounting hole includes: A rectangular motherboard surface area is provided, and the second mounting plate is connected to the back of the motherboard surface area. The top plate surface area is rectangular and connected to the upper end of the main plate surface area. The width of the top plate surface area is smaller than that of the main plate surface area. The clearance through hole is located on the top plate surface area.

8. The underframe assembly according to any one of claims 1-7, characterized in that, The second mounting plate includes: Intermediate plate area, the intermediate plate area being connected to the back of the first mounting plate; Two side plate areas are connected to the horizontal sides of the middle plate area, and the two side plate areas are respectively connected to the longitudinal beam by fasteners.

9. The underframe assembly according to claim 8, characterized in that, The first mounting plate has a weight-reducing hole at its center, and the intermediate plate area is welded to the first mounting plate; The intermediate plate area has a weld seam between it and the first mounting plate, and the weld seam is located on at least two sides of the weight reduction hole.

10. A vehicle, characterized in that, Includes the underframe assembly according to any one of claims 1-9.

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