Center sill, frame and vehicle

Abstract

The application discloses a middle longitudinal beam, a vehicle frame and a vehicle. The middle longitudinal beam comprises a first beam body configured to be connected with front and rear longitudinal beams of the vehicle frame, and a lower end of the first beam body is provided with a first connecting surface configured to be bolted with a battery pack. The middle longitudinal beam further comprises a second beam body comprising a main body part, a first extension part and a second extension part. The main body part is connected with an outer side of the first beam body in the Y direction. The first extension part is arranged on an upper side of the main body part and is provided with a second connecting surface at an upper end thereof, the second connecting surface being configured to be bolted with a floor of a vehicle body. The second extension part is arranged on a side of the main body part away from the first beam body and is provided with a third connecting surface at an upper end thereof, the third connecting surface being configured to be bolted with a rocker beam of the vehicle body. The first beam body and the second beam body are integrally formed of aluminum material. The first beam body is fixedly connected with the battery pack, and the second beam body is fixedly connected with the vehicle body. The three are directly connected, the bending and torsional stiffness of the whole vehicle is improved, the aluminum material is light in weight, and the light weight design of the whole vehicle is met.

Description

Technical Field

[0001] This application belongs to the field of vehicle technology, and in particular relates to a longitudinal beam, a frame, and a vehicle. Background Technology

[0002] In related technologies, to ensure performance and platform commonality, off-road vehicles, pickup trucks, and other heavy vehicles often adopt non-load-bearing body structures. The frame is used as a common platform component, while the body is designed differently, with the body and frame connected by suspension mounts. However, the non-load-bearing body design with suspension mounts has extremely low overall torsional and bending stiffness, posing certain safety hazards. Summary of the Invention

[0003] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a mid-longitudinal beam, a frame, and a vehicle that improves the overall vehicle-level bending and torsional stiffness, meets the requirements of lightweight vehicle design, and reduces safety hazards.

[0004] In a first aspect, this application provides a center longitudinal beam for use in the frame of a semi-monocoque chassis, the center longitudinal beam comprising:

[0005] The first beam is used to connect with the front and rear longitudinal beams of the vehicle frame. The lower end of the first beam is provided with a first connecting surface for bolting the battery pack.

[0006] The second beam includes a main body, a first extension and a second extension. The main body is connected to the outer side of the first beam in the Y direction. The first extension is located on the upper side of the main body and has a second connecting surface at its upper end for bolting to the floor of the vehicle body. The second extension is located on the side of the main body away from the first beam and has a third connecting surface at its upper end for bolting to the sill beam of the vehicle body.

[0007] The first beam and the second beam are integrally formed from aluminum.

[0008] According to the longitudinal beam of this application, it is fixedly connected to the battery pack through the first beam and fixedly connected to the vehicle body through the second beam, realizing the direct connection between the vehicle body, frame and battery pack, improving the bending and torsional stiffness of the whole vehicle, and the aluminum profile is lightweight, which meets the lightweight design of the whole vehicle and reduces safety hazards.

[0009] According to one embodiment of this application, the front end of the first beam protrudes beyond the front end of the second beam, and the rear end of the second beam protrudes beyond the rear end of the first beam.

[0010] According to one embodiment of this application, the portion of the second beam protruding from the first beam is provided with a limiting surface, which is located on the outer side of the second beam in the Y direction.

[0011] According to one embodiment of this application, the portion of the first beam protruding from the second beam is provided with a first connecting hole for connecting with the front longitudinal beam, and the rear end of the first beam is provided with a second connecting hole for connecting with the rear longitudinal beam.

[0012] According to one embodiment of this application, the second connecting surface is higher than the upper surface of the first beam, and a diagonal rib is connected between the first extension and the first beam. The diagonal rib is located in the overlapping area of ​​the first beam and the second beam in the X direction.

[0013] According to one embodiment of this application, the main body includes a first cavity, a second cavity, and a third cavity extending along the X direction, and the three cavities are distributed in a triangular shape.

[0014] The first cavity is located on the upper side, the second cavity and the third cavity are located on the lower side of the first cavity and distributed along the Y direction, the first extension is connected to the upper surface of the first cavity, and the second extension is connected to the side of the third cavity.

[0015] The third cavity has a decreasing dimension in the Z direction along the direction close to the second extension, and the second cavity has the same dimension in the Z direction as the end of the third cavity close to the second cavity, and the second extension has the same dimension in the Z direction as the end of the third cavity close to the second extension.

[0016] According to one embodiment of this application, a fourth cavity is provided on the lower side of the second cavity. The fourth cavity has the same dimension as the second cavity in the Y direction, and its lower surface is flush with the lower surface of the first beam; and / or

[0017] The upper surface of the main body is flush with the upper surface of the first beam.

[0018] According to one embodiment of this application, the first beam body is provided with a plurality of transverse ribs distributed along the Z direction and a plurality of vertical ribs distributed along the Y direction. The lower end of the vertical ribs is connected to the transverse rib located at the lowest end. The transverse rib located at the lowest end is spaced apart from the lower side wall of the first beam body to form a fifth cavity. The plurality of transverse ribs and the plurality of vertical ribs intersect to divide the part of the first beam body excluding the fifth cavity to form a plurality of sixth cavities.

[0019] Secondly, this application provides a chassis for use in a semi-monocoque chassis, the chassis comprising:

[0020] Such as the longitudinal beam in the first aspect;

[0021] The front longitudinal beam is connected to the front end of the first beam body, and at least a portion of the rear end of the front longitudinal beam body is wrapped around the front end of the first beam body and connected to the front end of the first beam body by bolts.

[0022] The rear longitudinal beam is connected to the rear end of the first beam. At least a portion of the front end of the rear longitudinal beam extends into the rear end of the first beam and is bolted to the rear end of the first beam.

[0023] According to the frame of this application, the overall structural strength of the longitudinal beams is ensured by the connection structure design between the first beam and the front and rear longitudinal beams. The first beam is fixedly connected to the battery pack, and the second beam is fixedly connected to the vehicle body, realizing the direct connection between the vehicle body, the frame and the battery pack, improving the bending and torsional stiffness of the whole vehicle. Moreover, the aluminum profile is lightweight, which meets the requirements of the lightweight design of the whole vehicle.

[0024] Thirdly, this application also provides a vehicle, including:

[0025] Such as the second aspect of the vehicle frame;

[0026] The vehicle body includes the floor and the sill beam, with the floor rigidly connected to the second connecting surface and the sill beam rigidly connected to the third connecting surface;

[0027] The battery pack is connected to the first connection surface.

[0028] The beneficial effects of the vehicle provided in the third aspect of this application are the same as the beneficial effects of the frame in the second aspect, and will not be repeated here.

[0029] Additional aspects and advantages of this application 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 this application. Attached Figure Description

[0030] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0031] Figure 1 This is a schematic diagram of the connection structure of the front longitudinal beam, middle longitudinal beam and rear longitudinal beam provided in the embodiments of this application;

[0032] Figure 2 This is a schematic diagram of the structure of the longitudinal beam provided in the embodiment of this application;

[0033] Figure 3 yes Figure 2 Cross-sectional view at point AA;

[0034] Figure 4 This is a schematic diagram of the connection structure between the longitudinal beam and the rear of the vehicle body provided in an embodiment of this application;

[0035] Figure 5 yes Figure 4 Cross-sectional view at point BB;

[0036] Figure 6 This is a schematic diagram of the connection structure between the middle longitudinal beam and the rear longitudinal beam provided in an embodiment of this application;

[0037] Figure 7 yes Figure 6 Cross-sectional view at point CC.

[0038] Figure label:

[0039] 1. Central longitudinal beam;

[0040] 11. First beam body; 111. First connecting surface; 112. First connecting hole; 113. Second connecting hole; 114. Horizontal reinforcement; 115. Vertical reinforcement; 116. Fifth cavity; 117. Sixth cavity; 118. Sixth connecting surface; 119. Diagonal reinforcement;

[0041] 12. Second beam; 121. Main body; 1211. First cavity; 1212. Second cavity; 1213. Third cavity; 1214. Fifth connecting surface; 122. First extension; 1221. Second connecting surface; 1222. First extension cavity; 123. Second extension; 1231. Third connecting surface; 1232. Fourth connecting surface; 1233. Fourth cavity; 124. Limiting surface;

[0042] 2. Front longitudinal beam; 3. Rear longitudinal beam;

[0043] 4. Body; 41. Floor; 42. Door sill beam. Detailed Implementation

[0044] The embodiments of this application are described in detail below. Examples of the 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 application, and should not be construed as limiting this application.

[0045] Unless otherwise specified, the front-to-back direction in this application refers to the longitudinal direction of the vehicle, i.e., the X-direction, along which the longitudinal beams of the vehicle extend; the left-to-right direction refers to the transverse direction of the vehicle, i.e., the Y-direction; and the up-down direction refers to the vertical direction of the vehicle, i.e., the Z-direction.

[0046] In the current market, to ensure performance and platform commonality, many heavy vehicles, such as off-road vehicles and pickup trucks, adopt a non-load-bearing body structure. The frame is used as a common platform component, while the body is designed differently, with the body and frame connected by suspension mounts. However, the non-load-bearing body design with suspension mounts has extremely low overall torsional and bending stiffness, posing certain safety hazards.

[0047] Based on the above considerations, this application proposes a semi-monocoque body design in which the longitudinal beam, frame, and vehicle are bolted together, which can greatly improve the overall bending and torsional stiffness and significantly enhance the overall integrity. Furthermore, directly connecting the body, frame, and battery pack further improves the overall bending and torsional stiffness and meets the requirements for lightweight vehicle design.

[0048] The following is for reference. Figures 1-7 Describes the longitudinal beam according to an embodiment of this application.

[0049] Please see Figure 1 , Figure 2 and Figure 3 In this embodiment, the longitudinal beam 1 is applied to the frame of the semi-monocoque body 4. Specifically, as the middle section of the longitudinal beam of the frame, it is convenient to directly connect with the body 4 and the battery pack.

[0050] The central longitudinal beam 1 includes a first beam body 11 and a second beam body 12. The first beam body 11 and the second beam body 12 are integrally formed from aluminum. Specifically, the first beam body 11 and the second beam body 12 can be integrally formed aluminum profiles, which are lightweight and have high structural strength, ensuring structural strength while meeting the lightweight design requirements of the whole vehicle.

[0051] The first beam 11 is used to connect with the front longitudinal beam 2 and the rear longitudinal beam 3 of the vehicle frame. The lower end of the first beam 11 is provided with a first connecting surface 111 for bolt connection with the battery pack.

[0052] It is understandable that the front longitudinal beam 2 is the front section of the longitudinal beam, and the rear longitudinal beam 3 is the rear section of the longitudinal beam. The first beam body 11 is connected to the front longitudinal beam 2 and the rear longitudinal beam 3 to ensure the structural stability of the entire longitudinal beam. The lower end face of the first beam body 11 is provided with a first connecting surface 111. The support structure of the battery pack is bolted to the first connecting surface 111 to ensure the stability of the connection between the battery pack and the middle longitudinal beam 1, and to connect the longitudinal beam and the battery pack into a whole.

[0053] Please see Figure 3 , Figure 4 and Figure 5 The second beam 12 includes a main body 121, a first extension 122, and a second extension 123. The main body 121 is connected to the outer side of the first beam 11 in the Y direction. The first extension 122 is located on the upper side of the main body 121 and has a second connecting surface 1221 at its upper end for bolting to the floor 41 of the vehicle body 4. The second extension 123 is located on the side of the main body 121 away from the first beam 11 and has a third connecting surface 1231 at its upper end for bolting to the sill beam 42 of the vehicle body 4.

[0054] The second beam 12 consists of three parts. The main body 121 is connected to the outer side of the first beam 11 in the Y direction for connection with the vehicle body 4. The first extension 122 is located on the upper side of the main body 121, so that the first extension 122 is located near the floor 41 of the vehicle body 4. The upper end of the first extension 122 has a second connecting surface 1221 that is bolted to the floor 41, forming the first rigid connection position between the longitudinal beam 1 and the vehicle body 4. The second connecting surface 1221 can be connected to the crossbeam of the floor 41 to ensure the stability of the overall installation. The second extension 123 is located on the side of the main body 121 away from the first beam 11, that is, on the outer side of the main body 121 in the Y direction, so that the second extension 123 is located on the lower side of the sill beam 42 of the vehicle body 4. The upper end of the second extension 123 has a third connecting surface 1231 that is bolted to the sill beam 42, forming the second rigid connection position between the longitudinal beam 1 and the vehicle body 4, forming a single-sided double-row connection, which effectively improves the torsional stiffness.

[0055] By setting the first extension 122 and the second extension 123, the body 4 is rigidly connected to the floor 41 and the sill beam 42 of the vehicle body 4 by bolts, instead of being suspended. Compared with the traditional suspension connection, it has better overall rigidity and greatly improves the bending and torsional stiffness of the whole vehicle. In addition, the first beam 11 is fixedly connected to the battery pack, and the first beam 11 and the second beam 12 are integrated, so that the body 4, the frame and the battery pack are directly connected, which further improves the bending and torsional stiffness of the whole vehicle and reduces safety hazards.

[0056] According to the embodiment of this application, the longitudinal beam 1 is fixedly connected to the battery pack through the first beam 11 and fixedly connected to the vehicle body 4 through the second beam 12, so that the vehicle body 4, the frame and the battery pack are directly connected, which improves the bending and torsional stiffness of the whole vehicle, and the aluminum profile is lightweight, which meets the lightweight design of the whole vehicle and reduces safety hazards.

[0057] Please see Figure 2 , Figure 6 and Figure 7 According to some embodiments of this application, the front end of the first beam 11 protrudes beyond the front end of the second beam 12, and the rear end of the second beam 12 protrudes beyond the rear end of the first beam 11.

[0058] The first beam 11 and the second beam 12 are offset along the X-direction, such that the front end of the first beam 11 protrudes beyond the front end of the second beam 12, and the rear end of the second beam 12 protrudes beyond the rear end of the first beam 11. In other words, in the X-direction, the front end of the first beam 11 is located in front of the second beam 12, and the rear end of the first beam 11 is also located in front of the second beam 12. This offset arrangement facilitates a nested connection between the first beam 11 and the front longitudinal beam 2 and the rear longitudinal beam 3, thereby ensuring the overall structural strength of the entire longitudinal beam.

[0059] For example, the front end of the first beam 11 protrudes, and the rear end of the front longitudinal beam 2 can be fitted onto the front end of the first beam 11, increasing the mating distance and improving the connection strength between the middle longitudinal beam 1 and the front longitudinal beam 2. The rear end of the second beam 12 protrudes from the rear end of the first beam 11, and the front end of the rear longitudinal beam 3 can extend into the rear end of the first beam 11, improving the connection strength between the middle longitudinal beam 1 and the rear longitudinal beam 3.

[0060] Please see Figure 2 , Figure 6 and Figure 7 According to some embodiments of this application, the portion of the second beam 12 that protrudes from the first beam 11 may be provided with a limiting surface 124, which is located on the outer side of the second beam 12 in the Y direction.

[0061] The rear end of the second beam 12 protrudes beyond the rear end of the first beam 11, so that the side of the portion of the second beam 12 that protrudes beyond the first beam 11 forms a limiting surface 124, and the limiting surface 124 is located on the outer side of the second beam 12 in the Y direction.

[0062] It should be noted that, because the front longitudinal beam 2 and the rear longitudinal beam 3 need to avoid the wheels and other components, the front part of the rear longitudinal beam 3 is at least partially bent. By setting the limiting surface 124, after the front end of the rear longitudinal beam 3 is inserted into the first beam 11, at least part of the outer wall of the rear longitudinal beam 3 still abuts against the limiting surface 124, thereby improving the stability of the connection of the rear longitudinal beam 3 and reducing the probability of breakage at the connection position. In addition, the protruding part of the second beam 12 can also play a certain protective role at the connection position between the rear longitudinal beam 3 and the first beam 11.

[0063] To avoid stress concentration at the connection between the first beam 11 and the rear longitudinal beam 3, and to effectively conduct and dissipate force and energy during a collision, the transition angle at the connection between the rear longitudinal beam 3 and the middle longitudinal beam 1 should be minimized to facilitate the conduction of force and energy. Therefore, the rear end of the middle longitudinal beam 1 is designed with a staggered structure, so that the connection point between the middle longitudinal beam 1 and the rear longitudinal beam 3 is as close to the front of the vehicle as possible, increasing the length of the rear longitudinal beam 3 and avoiding an excessively large corner design angle at the connection point of the rear longitudinal beam 3, which could lead to the risk of longitudinal beam breakage during a collision. At the same time, the staggered structure design at the rear end of the middle longitudinal beam 1 can also enhance the rigidity of the entire vehicle and the connection point between the body 4 and the frame.

[0064] Please see Figure 2 and Figure 7 According to some embodiments of this application, the portion of the first beam 11 protruding from the second beam 12 may be provided with a first connecting hole 112 for connecting with the front longitudinal beam 2, and the rear end of the first beam 11 may be provided with a second connecting hole 113 for connecting with the rear longitudinal beam 3.

[0065] The first beam 11 is bolted to the front longitudinal beam 2 and the rear longitudinal beam 3. The connection structure is stable and the assembly is simple, and it is also easy to maintain and replace.

[0066] The portion of the first beam 11 protruding from the second beam 12 is provided with a first connecting hole 112, that is, the front end of the first beam 11 is provided with a first connecting hole 112. At least two surfaces of the front end of the first beam 11 are provided with the first connecting hole 112 to form multiple connection points with the front longitudinal beam 2, ensuring the stability of the connection structure. For example, the front end of the first beam 11 is provided with first connecting holes 112 on the upper and lower surfaces in the Z direction and on the outer surface in the Y direction, thereby forming a fastening force in both the Y and Z directions, facilitating assembly operations and ensuring the stability of the overall connection. The number of first connecting holes 112 on each surface is not limited and can be two, four, etc., determined according to actual needs and installation space conditions.

[0067] The rear end of the first beam 11 is provided with a second connecting hole 113. At least two surfaces of the rear end of the first beam 11 are provided with the second connecting hole 113 to form multiple connection points with the rear longitudinal beam 3, ensuring the stability of the connection structure. For example, the rear end of the first beam 11 is provided with first connecting holes 112 on the upper surface, lower surface, and outer surface connected to the main body 121 in the Z direction, thereby forming fastening forces in both the Y and Z directions, facilitating assembly operations and ensuring the stability of the overall connection. The number of second connecting holes 113 on each surface is not limited; it can be two, four, etc., determined according to actual needs and installation space conditions.

[0068] Please see Figure 3 According to some embodiments of this application, the second connecting surface 1221 may be higher than the upper surface of the first beam 11, and a diagonal rib 119 may be connected between the first extension 122 and the first beam 11. The diagonal rib 119 may be provided in the overlapping area of ​​the first beam 11 and the second beam 12 in the X direction.

[0069] The upper end of the first extension 122 protrudes from the upper surface of the first beam 11, so that the second connecting surface 1221 is higher than the upper surface of the first beam 11. This facilitates the fixed connection between the second connecting surface 1221 and the floor 41, and also forms a cable passage between the lower side of the floor 41 and the upper surface of the first beam 11, making it convenient to arrange components such as wire harnesses and conduits. For example, the diagonal rib 119 may be provided with snap-fit ​​fixing holes for fixing the air pipes of the chassis, thereby improving the stability of the air pipe installation.

[0070] By providing inclined ribs 119 between the first extension 122 and the first beam 11, the first extension 122 is supported and strengthened, thereby improving the stability of the overall structure. The inclination angle of the inclined ribs 119 is not limited. For example, the inclined ribs 119 are 45° inclined ribs 119.

[0071] The inclined rib 119 is set in the overlapping part of the first beam 11 and the second beam 12, which facilitates the arrangement of the inclined rib 119 and avoids the inclined rib 119 interfering with the connection hole set on the upper surface of the first beam 11.

[0072] Please see Figure 3 According to some embodiments of this application, the main body 121 includes a first cavity 1211, a second cavity 1212 and a third cavity 1213 extending along the X direction, and the three cavities are distributed in a triangular shape.

[0073] Furthermore, the first extension 122, the second extension 123, and the first beam 11 are connected as a whole through the main body 121. The structural strength of the main body 121 is the key to the structural strength of the entire longitudinal beam 1. By setting three cavities distributed in a triangular shape, the structural strength of the main body 121 is enhanced, thereby improving the structural strength of the entire longitudinal beam 1 and the stability between the connection points.

[0074] The first cavity 1211 is located on the upper side, the second cavity 1212 and the third cavity 1213 are located on the lower side of the first cavity 1211 and distributed along the Y direction, the first extension 122 is connected to the upper surface of the first cavity 1211, and the second extension 123 is connected to the side of the third cavity 1213.

[0075] The second cavity 1212 and the third cavity 1213 are located below the first cavity 1211, and the width of the second cavity 1212 in the Y direction is smaller than that of the first cavity 1211, so that the partition rib between the second cavity 1212 and the third cavity 1213 is connected to the lower side wall of the first cavity 1211. The first cavity 1211, the second cavity 1212 and the third cavity 1213 are arranged in a triangular shape, and the structure is highly stable.

[0076] The first extension 122 is connected to the upper surface of the first cavity 1211. The first extension 122 has a first extension cavity 1222 extending in the X direction. The width of the first extension cavity 1222 can be the same as the width of the first cavity 1211. This improves the structural strength of the first extension 122 itself and the load-bearing capacity of the first connecting surface 111, while also improving the stability of the connection between the first extension 122 and the main body 121, thus improving the overall structural strength.

[0077] The second extension 123 is connected to the side of the third cavity 1213. Specifically, the second extension 123 is connected to the surface of the third cavity 1213 on the side away from the second cavity 1212 in the Y direction. Because the second extension 123 is located on the outermost side of the central longitudinal beam 1, the second extension 123 provides a certain crumple effect to reduce the impact on the battery during the column impact test.

[0078] The third cavity 1213 has a decreasing dimension in the Z direction along the direction close to the second extension 123, and the second cavity 1212 has the same dimension in the Z direction as the end of the third cavity 1213 near the second cavity 1212, and the second extension 123 has the same dimension in the Z direction as the end of the third cavity 1213 near the second extension 123.

[0079] The height of the second extension 123 is the same as the height of the end of the third cavity 1213 near the second extension 123. The second extension 123 has a second extension cavity extending in the X direction, which improves the structural strength of the second extension 123 itself and the stability of the connection between the second extension 123 and the main body 121, thereby improving the overall structural strength. Furthermore, the height of the third cavity 1213 tends to decrease in the direction near the second extension 123, so that the cross-section of the third cavity 1213 itself is funnel-shaped, increasing the cross-sectional area of ​​the entire longitudinal beam 1. Specifically, the lower sidewall of the third cavity 1213 is inclined. And because the height of the second cavity 1212 is the same as the end of the third cavity 1213 near the second cavity 1212, the fifth cavity 116, the third cavity 1213 and the second cavity 1212 together form a stable structure similar to a triangle, which has strong overall stability and good force transmission effect, strong load-bearing capacity, and higher overall safety in column impact tests or other side impact scenarios.

[0080] The height of the second extension cavity is defined to meet the space required for the installation of standard parts, and the width is defined to meet the space required for bolt installation tools. This ensures that a certain safety gap is maintained between the standard parts and the cavity wall during assembly, avoiding the risk of abnormal noises during vehicle operation. The specific values ​​are not limited.

[0081] The inclination angle of the lower sidewall of the third cavity 1213 is not limited and can be 30°-60°. In one example, the inclination angle of the lower sidewall of the third cavity 1213 is 45°.

[0082] In some embodiments, the lower side of the second extension 123 is provided with a fourth connecting surface 1232, and the lower side of the third cavity 1213 is provided with a fifth connecting surface 1214. The fourth connecting surface 1232 and the fifth connecting surface 1214 can be used to connect with the side steps of the vehicle.

[0083] Please see Figure 3 According to some embodiments of this application, a fourth cavity 1233 is provided on the lower side of the second cavity 1212. The fourth cavity 1233 has the same Y-direction dimension as the second cavity 1212, and the lower surface of the fourth cavity 1233 is flush with the lower surface of the first beam 11.

[0084] The width of the fourth cavity 1233 is the same as that of the second cavity 1212, and it is located below the second cavity 1212. Thus, the outer side wall of the fourth cavity 1233 is connected to the lower side wall of the third cavity 1213, thereby increasing the force transmission path. Furthermore, the lower surface of the fourth cavity 1233 is flush with the lower surface of the first beam 11, which facilitates the force transmission between the fourth cavity 1233 and the first beam 11. This helps to share the force on the third connecting surface 1231, enhances the load-bearing capacity of the third connecting surface 1231, and improves the stability of the entire structure, increases the overall stiffness, and enhances the safety performance.

[0085] The upper surface of the main body 121 is flush with the upper surface of the first beam 11.

[0086] The upper sidewall of the main body 121 is flush with and connected to the upper sidewall of the first beam 11, improving the overall integrity and rigidity of the structure. It also facilitates the design of the height of the first extension 122.

[0087] Please see Figure 3 According to some embodiments of this application, the first beam 11 is provided with a plurality of transverse ribs 114 distributed along the Z direction and a plurality of vertical ribs 115 distributed along the Y direction. The lower end of the vertical ribs 115 is connected to the transverse ribs 114 located at the lowest end. The transverse ribs 114 located at the lowest end and the lower side wall of the first beam 11 are spaced apart to form a fifth cavity 116. The plurality of transverse ribs 114 and the plurality of vertical ribs 115 intersect to divide the portion of the first beam 11 except for the fifth cavity 116 to form a plurality of sixth cavities 117.

[0088] Both the horizontal rib 114 and the vertical rib 115 extend along the X direction to divide the first beam 11 into multiple cavities distributed along the Y and Z directions. The vertical rib 115 can improve the load-bearing capacity of the third connecting surface 1231 and increase the stiffness in the Z direction. The horizontal rib 114 enhances the Y-direction strength of the first beam 11 and improves the overall stiffness, which can better protect the battery in the event of a side impact.

[0089] The third connecting surface 1231 is located below the fifth cavity 116. The fifth cavity 116 enhances the load-bearing capacity of the third connecting surface 1231. Since the fifth cavity 116 is the battery pack mounting cavity, and the battery pack is relatively heavy, its width is increased during the design process, thus enlarging the battery pack mounting surface. This effectively reduces the force borne by the battery pack mounting point and avoids stress concentration at the mounting point. The height design of the fifth cavity 116 primarily ensures a safe clearance between the inner wall of the fifth cavity 116 and the tightened bolts, preventing the risk of abnormal noise.

[0090] In some embodiments, the upper end of the first beam 11 is provided with a sixth connecting surface 118, which can serve as the mounting surface of the battery pack mounting beam, so that the beam provides a Y-axis mounting point for the battery pack and reduces the stress on the third connecting surface 1231 of the battery pack.

[0091] The sixth connecting surface 118 may also be provided with snap-fit ​​holes for connecting cooling pipes to enhance the stability of the cooling pipes.

[0092] This application also provides a vehicle frame for use in a semi-monocoque chassis 4.

[0093] Please see Figure 1 , Figure 2 and Figure 4 The frame includes a central longitudinal beam 1, a front longitudinal beam 2, and a rear longitudinal beam 3, as described in any of the above technical solutions.

[0094] First, it should be noted that since the frame of this application embodiment includes the central longitudinal beam 1 as described in any of the above technical solutions, it has the technical features and beneficial effects of the central longitudinal beam 1 as described in any of the above technical solutions, which will not be repeated here.

[0095] The front longitudinal beam 2 is connected to the front end of the first beam 11, and at least a portion of the rear end of the front longitudinal beam 2 wraps around the front end of the first beam 11 and is bolted to the front end of the first beam 11; the rear longitudinal beam 3 is connected to the rear end of the first beam 11, and at least a portion of the front end of the rear longitudinal beam 3 extends into the rear end of the first beam 11 and is bolted to the rear end of the first beam 11.

[0096] By designing the connections of the front and middle longitudinal beams 1 and the middle and rear longitudinal beams 3 as wrap-around connections, the connection structure is stable, has high rigidity, avoids stress concentration, and improves the overall rigidity of the vehicle.

[0097] In order to ensure the safety clearance of bolt installation, the space for tool operation, and the limitation of the cross section of the rear longitudinal beam 3, the second connection point at the rear end of the first beam 11 is arranged in a staggered manner.

[0098] This application also provides a vehicle. The vehicle includes a frame, a body 4, and a battery pack as described above. The body 4 includes a floor 41 and a sill beam 42. The floor 41 is rigidly connected to a second connecting surface 1221, and the sill beam 42 is rigidly connected to a third connecting surface 1231. The battery pack is connected to a first connecting surface 111.

[0099] The beneficial effects of the vehicle in this embodiment are the same as those of the vehicle frame in the above-described technical solution, and will not be repeated here.

[0100] In some embodiments, the vehicle in this application may be a pure electric or hybrid vehicle with a battery pack structure.

[0101] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0102] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application 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 application.

[0103] In the description of this application, "first feature" and "second feature" may include one or more of the features.

[0104] In the description of this application, "multiple" means two or more.

[0105] In the description of this application, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features being in contact through another feature between them.

[0106] In the description of this application, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0107] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. 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.

[0108] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A longitudinal beam, used in the frame of a semi-monocoque chassis, characterized in that, The longitudinal beam includes: The first beam is used to connect with the front and rear longitudinal beams of the vehicle frame, and the lower end of the first beam is provided with a first connecting surface for bolting the battery pack. The second beam includes a main body, a first extension, and a second extension. The main body is connected to the outer side of the first beam in the Y direction. The first extension is located on the upper side of the main body and has a second connecting surface at its upper end for bolting to the floor of the vehicle body. The second extension is located on the side of the main body away from the first beam and has a third connecting surface at its upper end for bolting to the sill beam of the vehicle body. The first beam and the second beam are integrally formed from aluminum material; The front end of the first beam protrudes beyond the front end of the second beam, and the rear end of the second beam protrudes beyond the rear end of the first beam. The first beam and the second beam are offset along the X direction so that the side of the portion of the second beam protruding from the first beam forms a limiting surface, and the limiting surface is located on the outside of the second beam in the Y direction. The limiting surface is used to abut against at least a portion of the outer wall of the rear longitudinal beam to improve the stability of the rear longitudinal beam connection. The front end of the first beam is used to connect with the rear end of the front longitudinal beam of the frame, and the rear end of the first beam is used to connect with the front end of the rear longitudinal beam of the frame.

2. The longitudinal beam according to claim 1, characterized in that, The portion of the first beam protruding from the second beam is provided with a first connecting hole for connecting with the front longitudinal beam, and the rear end of the first beam is provided with a second connecting hole for connecting with the rear longitudinal beam.

3. The longitudinal beam according to claim 1, characterized in that, The second connecting surface is higher than the upper surface of the first beam, and the first extension is connected to the first beam by a diagonal rib, which is located in the overlapping area of ​​the first beam and the second beam in the X direction.

4. The longitudinal beam according to any one of claims 1-3, characterized in that, The main body includes a first cavity, a second cavity, and a third cavity extending along the X direction, and the three cavities are distributed in a triangular shape. Wherein, the first cavity is located on the upper side, the second cavity and the third cavity are located on the lower side of the first cavity and distributed along the Y direction, the first extension is connected to the upper surface of the first cavity, and the second extension is connected to the side of the third cavity; The third cavity has a decreasing dimension in the Z direction along the direction close to the second extension, and the second cavity has the same dimension in the Z direction as the end of the third cavity close to the second cavity, and the second extension has the same dimension in the Z direction as the end of the third cavity close to the second extension.

5. The longitudinal beam according to claim 4, characterized in that, A fourth cavity is provided below the second cavity. The fourth cavity has the same dimensions as the second cavity in the Y direction, and its lower surface is flush with the lower surface of the first beam; and / or, The upper surface of the main body is flush with the upper surface of the first beam.

6. The longitudinal beam according to any one of claims 1-3, characterized in that, The first beam body is provided with a plurality of transverse ribs distributed along the Z direction and a plurality of vertical ribs distributed along the Y direction. The lower end of the vertical ribs is connected to the transverse rib located at the lowest end. The transverse rib located at the lowest end is spaced apart from the lower side wall of the first beam body to form a fifth cavity. The plurality of transverse ribs and the plurality of vertical ribs intersect to divide the portion of the first beam body excluding the fifth cavity into a plurality of sixth cavities.

7. A frame for use in a semi-monocoque chassis, characterized in that, The frame includes: The longitudinal beam as described in any one of claims 1-6; A front longitudinal beam is connected to the front end of the first beam body, and at least a portion of the rear end of the front longitudinal beam body wraps around the front end of the first beam body and is bolted to the front end of the first beam body. The rear longitudinal beam is connected to the rear end of the first beam, and at least a portion of the front end of the rear longitudinal beam extends into the rear end of the first beam and is bolted to the rear end of the first beam.

8. A vehicle, characterized in that, include: The frame as described in claim 7; The vehicle body includes a floor and a sill beam, wherein the floor is rigidly connected to the second connecting surface and the sill beam is rigidly connected to the third connecting surface; A battery pack, which is connected to the first connecting surface.

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