Middle longitudinal beam, frame and vehicle

Abstract

The invention discloses a middle longitudinal beam, a frame and a vehicle, the middle longitudinal beam comprises a first beam body used for being connected with a front longitudinal beam and a rear longitudinal beam of the frame, and the lower end of the first beam body is provided with a first connecting surface used for being connected with a battery pack bolt; the second beam body comprises a main body part, a first extension part and a second extension part, the main body part is connected with the Y-direction outer side of the first beam body, the first extension part is arranged on the upper side of the main body part, the upper end of the first extension part is provided with a second connecting face used for being connected with a floor bolt of a vehicle body, and the second extension part is arranged on the side, away from the first beam body, of the main body part; a third connecting surface in bolted connection with a doorsill beam of the automobile body is arranged at the upper end; the first beam body and the second beam body are integrally formed by aluminum materials. The first beam body is fixedly connected with the battery pack, and the second beam body is fixedly connected with the vehicle body, so that the vehicle body, the frame and the battery pack are directly connected, the bending torsional rigidity of the whole vehicle is improved, the aluminum profile is light, and the lightweight design of the whole vehicle is met.

Description

Technical Field

[0001] The present application belongs to the field of vehicle technology, and in particular relates to a center longitudinal beam, a frame and a vehicle. Background Art

[0002] In related technologies, in order to ensure the universality of various performances and platforms, off-road vehicles, pickup trucks and other heavy-duty vehicles mostly adopt non-load-bearing body structures. The frame is used as a universal platform, and the body is designed differently, with the body and frame connected by suspension. However, the non-load-bearing body design with suspension connection has extremely low vehicle-level torsional bending stiffness, which poses certain safety risks. Summary of the invention

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a middle longitudinal beam, a frame and a vehicle, which improve the bending and torsional rigidity of the whole vehicle level, meet the lightweight design of the vehicle, and reduce safety hazards.

[0004] In a first aspect, the present application provides a middle longitudinal beam, which is applied to a frame of a semi-monocoque vehicle body, and the middle longitudinal beam comprises:

[0005] A first beam body, used to be connected to the front longitudinal beam and the rear longitudinal beam of the frame, and a first connecting surface for being bolted to the battery pack is provided at the lower end of the first beam body;

[0006] The second beam body comprises a main body, a first extension and a second extension, the main body being connected to the outer side of the first beam body in the Y direction, the first extension being arranged on the upper side of the main body, and having an upper end provided with a second connection surface for connecting with a floor bolt of a vehicle body, and the second extension being arranged on a side of the main body away from the first beam body, and having an upper end provided with a third connection surface for connecting with a door sill bolt of a vehicle body;

[0007] The first beam body and the second beam body are integrally formed of aluminum material.

[0008] According to the center longitudinal beam of the present application, the first beam body is fixedly connected to the battery pack, and the second beam body is fixedly connected to the vehicle body, thereby realizing a direct connection between the vehicle body, the frame and the battery pack, improving the bending and torsional stiffness of the whole vehicle, and the aluminum profile is light in weight, meeting the lightweight design of the whole vehicle and reducing safety hazards.

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

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

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

[0012] According to an embodiment of the present application, the second connecting surface is higher than the upper surface of the first beam body, and an oblique rib is connected between the first extension portion and the first beam body, and the oblique rib is arranged in the overlapping area of ​​the first beam body and the second beam body in the X direction.

[0013] According to an embodiment of the present 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 herringbone shape;

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

[0015] The size of the third cavity in the Z direction decreases along the direction approaching the second extension part, and the size of the second cavity in the Z direction is the same as the end of the third cavity close to the second cavity, and the size of the second extension part in the Z direction is the same as the end of the third cavity close to the second extension part.

[0016] According to one embodiment of the present application, a fourth cavity is provided on the lower side of the second cavity, the size of the fourth cavity in the Y direction is the same as that of the second cavity, and the lower surface of the fourth cavity 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 the present application, a 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 ends of the vertical ribs are connected to the transverse ribs located at the lowest ends, the transverse ribs located at the lowest ends are spaced from the lower side walls of the first beam body to form a fifth cavity, and the plurality of transverse ribs and the plurality of vertical ribs are staggered to divide the first beam body except the fifth cavity to form a plurality of sixth cavities.

[0019] In a second aspect, the present application provides a vehicle frame, which is applied to a semi-load-bearing vehicle body, and the vehicle frame includes:

[0020] The middle longitudinal beam as in the first aspect;

[0021] A front longitudinal beam connected to the front end of the first beam body, wherein at least a portion of the rear end of the front longitudinal beam is wrapped outside the front end of the first beam body and is 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 body. At least a portion of the front end of the rear longitudinal beam extends into the rear end of the first beam body and is connected to the rear end of the first beam body by bolts.

[0023] According to the frame of the present application, the overall structural strength of the longitudinal beam is ensured by the connection structure design of the first beam body and the front longitudinal beam and the rear longitudinal beam. The first beam body is fixedly connected to the battery pack and the second beam body is fixedly connected to the vehicle body, thereby realizing a direct connection between the vehicle body, the frame and the battery pack, thereby improving the bending and torsional stiffness of the whole vehicle. In addition, the aluminum profile is light in weight, satisfying the lightweight design of the whole vehicle.

[0024] In a third aspect, the present application further provides a vehicle, comprising:

[0025] As the frame of the second aspect;

[0026] The vehicle body comprises a floor and a sill beam, wherein the floor is rigidly connected to the second connection surface, and the sill beam is rigidly connected to the third connection surface;

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

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

[0029] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0031] Figure 1 It is a schematic diagram of the connection structure of the front longitudinal beam, the middle longitudinal beam and the rear longitudinal beam provided in an embodiment of the present application;

[0032] Figure 2 is a schematic structural diagram of a middle longitudinal beam provided in an embodiment of the present application;

[0033] Figure 3 yes Figure 2 Sectional view at AA in the middle;

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

[0035] Figure 5 yes Figure 4 Cross-section at the middle BB;

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

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

[0038] Reference numerals:

[0039] 1. Middle longitudinal beam;

[0040] 11. first beam body; 111. first connection surface; 112. first connection hole; 113. second connection hole; 114. transverse reinforcement; 115. vertical reinforcement; 116. fifth cavity; 117. sixth cavity; 118. sixth connection surface; 119. oblique reinforcement;

[0041] 12, second beam body; 121, main body; 1211, first cavity; 1212, second cavity; 1213, third cavity; 1214, fifth connection surface; 122, first extension portion; 1221, second connection surface; 1222, first extension cavity; 123, second extension portion; 1231, third connection surface; 1232, fourth connection surface; 1233, fourth cavity; 124, limiting surface;

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

[0043] 4. Car body; 41. Floor; 42. Door sill beam. DETAILED DESCRIPTION

[0044] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0045] Unless otherwise specified, the front-to-back direction in this application is the longitudinal direction of the vehicle, that is, the X direction, and the longitudinal beam of the vehicle extends along the X direction; the left-right direction is the lateral direction of the vehicle, that is, the Y direction; and the up-down direction is the vertical direction of the vehicle, that is, the Z direction.

[0046] In the current market, in order to ensure the universality of various performances and platforms, off-road vehicles, pickup trucks and other heavy-duty vehicles mostly adopt non-load-bearing body structures. The frame is used as a universal platform, and the body is designed differently, with the body and frame connected by suspension. However, the non-load-bearing body design with suspension connection has extremely low vehicle-level torsional bending stiffness, which poses certain safety risks.

[0047] Based on the above considerations, this application proposes a semi-load-bearing body design in which the middle longitudinal beam, frame and vehicle are connected by bolts of the body and frame as a whole, which can greatly improve the bending and torsional stiffness of the whole vehicle and greatly improve the integrity. At the same time, the body, frame and battery pack are directly connected to further improve the bending and torsional stiffness of the whole vehicle and meet the lightweight design of the whole vehicle.

[0048] Reference below Figure 1-Figure 7 A center longitudinal beam according to an embodiment of the present application is described.

[0049] See also Figure 1 , Figure 2 and Figure 3 The middle longitudinal beam 1 of the embodiment of the present application is applied to the frame of the semi-load-bearing 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 middle 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 of aluminum. Specifically, the first beam body 11 and the second beam body 12 can be integrally formed aluminum profiles with light weight and high structural strength. While ensuring the structural strength, it meets the lightweight design of the entire vehicle.

[0051] The first beam body 11 is used to be connected to the front longitudinal beam 2 and the rear longitudinal beam 3 of the frame, and the lower end of the first beam body 11 is provided with a first connecting surface 111 for being bolted to the battery pack.

[0052] It can be understood that the front longitudinal beam 2 is the front section of the longitudinal beam, 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, and the lower end surface of the first beam body 11 is provided with a first connecting surface 111, and the supporting 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 as a whole.

[0053] See also Figure 3 , Figure 4 and Figure 5 The second beam body 12 includes a main body 121, a first extension portion 122 and a second extension portion 123. The main body 121 is connected to the outer side of the first beam body 11 in the Y direction. The first extension portion 122 is arranged on the upper side of the main body 121, and the upper end is provided with a second connecting surface 1221 for bolting to the floor 41 of the vehicle body 4. The second extension portion 123 is arranged on the side of the main body 121 away from the first beam body 11, and the upper end is provided with a third connecting surface 1231 for bolting to the door sill beam 42 of the vehicle body 4.

[0054] The second beam body 12 is composed of three parts. The main body 121 is connected to the outer side surface of the first beam body 11 in the Y direction to facilitate connection with the vehicle body 4. The first extension part 122 is arranged on the upper side of the main body 121, so that the first extension part 122 is located near the floor 41 of the vehicle body 4. The upper end of the first extension part 122 is provided with a second connection surface 1221 bolted to the floor 41, forming a first rigid connection position between the middle longitudinal beam 1 and the vehicle body 4. The second connection surface 1221 can be specifically connected to the cross beam of the floor 41 to ensure the stability of the overall installation; the second extension part 123 is arranged on the side of the main body 121 away from the first beam body 11, that is, the outer side of the main body 121 in the Y direction, so that the second extension part 123 is located on the lower side of the door sill beam 42 of the vehicle body 4. The upper end of the second extension part 123 is provided with a third connection surface 1231 bolted to the door sill beam 42, forming a second rigid connection position between the middle longitudinal beam 1 and the vehicle body 4, forming a single-sided double-row connection, and effectively improving the torsional rigidity.

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

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

[0057] See also Figure 2 , Figure 6 and Figure 7 According to some embodiments of the present application, the front end of the first beam body 11 protrudes from the front end of the second beam body 12 , and the rear end of the second beam body 12 protrudes from the rear end of the first beam body 11 .

[0058] The first beam body 11 and the second beam body 12 are staggered in the X direction as a whole, so that the front end of the first beam body 11 protrudes from the front end of the second beam body 12, and the rear end of the second beam body 12 protrudes from the rear end of the first beam body 11, that is, in the X direction, the front end of the first beam body 11 is located in front of the second beam body 12, and the rear end of the first beam body 11 is also located in front of the second beam body 12, and the ends of the first beam body 11 and the second beam body 12 are staggered. This arrangement facilitates the nested connection of the first beam body 11 with 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 body 11 is protruding, and the rear end of the front longitudinal beam 2 can be sleeved on the front end of the first beam body 11, increasing the matching 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 body 12 protrudes from the rear end of the first beam body 11, and the front end of the rear longitudinal beam 3 can extend into the rear end of the first beam body 11, improving the connection strength between the middle longitudinal beam 1 and the rear longitudinal beam 3.

[0060] See also Figure 2 , Figure 6 and Figure 7 According to some embodiments of the present application, a portion of the second beam body 12 protruding from the first beam body 11 may be provided with a limiting surface 124, and the limiting surface 124 is located on the outer side of the second beam body 12 in the Y direction.

[0061] The rear end of the second beam body 12 protrudes from the rear end of the first beam body 11 , so that the side surface of the portion of the second beam body 12 protruding from the first beam body 11 forms a limiting surface 124 , and the limiting surface 124 is located outside the second beam body 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 wheels and other components, the front part of the rear longitudinal beam 3 is at least partially bent. By setting a limiting surface 124, after the front end of the rear longitudinal beam 3 is inserted into the first beam body 11, the outer wall of the rear longitudinal beam 3 is at least partially in contact with 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 body 12 can also play a certain protective role in the connection position between the rear longitudinal beam 3 and the first beam body 11.

[0063] In order to avoid stress concentration at the connection between the first beam 11 and the rear longitudinal beam 3 and to effectively conduct and disperse force and energy during a collision, the transition angle at the connection between the rear longitudinal beam 3 and the middle longitudinal beam 1 profile should be reduced as much as possible to facilitate the conduction of force and energy. Therefore, the rear end of the middle longitudinal beam 1 is designed to be 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, and the length of the rear longitudinal beam 3 is increased to avoid the rear longitudinal beam 3 having a corner design angle that is too large at the connection point, which may cause the risk of longitudinal beam breakage during a collision. At the same time, the staggered structural 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] See also Figure 2 and Figure 7 According to some embodiments of the present application, the portion of the first beam body 11 protruding from the second beam body 12 may be provided with a first connecting hole 112 for connecting to the front longitudinal beam 2, and the rear end of the first beam body 11 may be provided with a second connecting hole 113 for connecting to the rear longitudinal beam 3.

[0065] The first beam body 11 is connected to the front longitudinal beam 2 and the rear longitudinal beam 3 by bolts. The connection structure is stable and easy to assemble. It is also convenient for maintenance and replacement.

[0066] The portion of the first beam body 11 protruding from the second beam body 12 is provided with a first connection hole 112, that is, the front end of the first beam body 11 is provided with a first connection hole 112, wherein at least two surfaces of the front end of the first beam body 11 are provided with first connection holes 112 to form multiple connection points with the front longitudinal beam 2 to ensure the stability of the connection structure. Exemplarily, the front end of the first beam body 11 is provided with first connection holes 112 on the upper surface, the lower surface in the Z direction, and the outer side 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, wherein the number of first connection holes 112 provided 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 body 11 is provided with a second connection hole 113, wherein at least two surfaces of the rear end of the first beam body 11 are provided with the second connection holes 113 to form multiple connection points with the rear longitudinal beam 3 to ensure the stability of the connection structure. Exemplarily, the rear end of the first beam body 11 is provided with first connection holes 112 on the upper surface, the lower surface in the Z direction, and the outer side surface connected to the main body 121, thereby forming a fastening force in the Y direction and the Z direction, facilitating the assembly operation and ensuring the stability of the overall connection, wherein the number of the second connection holes 113 provided on each surface is not limited, and can be two, four, etc., determined according to actual needs and installation space conditions.

[0068] See also Figure 3 According to some embodiments of the present application, the second connecting surface 1221 may be higher than the upper surface of the first beam body 11, an oblique rib 119 may be connected between the first extension portion 122 and the first beam body 11, and the oblique rib 119 may be arranged in the overlapping area of ​​the first beam body 11 and the second beam body 12 in the X direction.

[0069] The upper end of the first extension portion 122 protrudes from the upper surface of the first beam body 11, so that the second connection surface 1221 is higher than the upper surface of the first beam body 11, which facilitates the fixed connection between the second connection surface 1221 and the floor 41, and forms a wire passage between the lower side of the floor 41 and the upper surface of the first beam body 11, which facilitates the arrangement of components such as wiring harnesses. For example, the oblique rib 119 may be provided with a buckle fixing hole for fixing the air pipeline of the chassis to improve the stability of the air pipeline installation.

[0070] By providing an oblique rib 119 between the first extension portion 122 and the first beam body 11, the first extension portion 122 is supported and reinforced to improve the stability of the overall structure, wherein the inclination angle of the oblique rib 119 is not limited, and illustratively, the oblique rib 119 is a 45° oblique rib 119.

[0071] The oblique ribs 119 are disposed at the overlapping portion of the first beam body 11 and the second beam body 12 , which facilitates the arrangement of the oblique ribs 119 and prevents the oblique ribs 119 from interfering with the connection holes disposed on the upper surface of the first beam body 11 .

[0072] See also Figure 3 According to some embodiments of the present 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 herringbone shape.

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

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

[0075] The second cavity 1212 and the third cavity 1213 are located on the lower side of 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, and the first cavity 1211, the second cavity 1212 and the third cavity 1213 are distributed in a herringbone shape as a whole, and the structure is highly stable.

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

[0077] The second extension portion 123 is connected to the side of the third cavity 1213. Specifically, the second extension portion 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 portion 123 is located at the outermost side of the middle longitudinal beam 1, when performing a pillar impact test, the second extension portion 123 provides a certain collapse effect to reduce the impact on the battery.

[0078] Among them, the size of the third cavity 1213 in the Z direction tends to decrease along the direction close to the second extension portion 123, and the size of the second cavity 1212 in the Z direction is the same as the end of the third cavity 1213 close to the second cavity 1212, and the size of the second extension portion 123 in the Z direction is the same as the end of the third cavity 1213 close to the second extension portion 123.

[0079] The height of the second extension part 123 is the same as the height of the end of the third cavity 1213 close to the second extension part 123. The second extension part 123 has a second extension cavity extending along the X direction, which improves the structural strength of the second extension part 123 itself, improves the stability of the connection between the second extension part 123 and the main body 121, and improves the overall structural strength. In addition, the height of the third cavity 1213 tends to decrease along the direction close to the second extension part 123, so that the cross section of the third cavity 1213 itself is trumpet-shaped, increasing the cross-sectional area of ​​the entire middle longitudinal beam 1. Specifically, the lower side wall 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 close to 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, with strong overall stability, and good force transmission effect, strong bearing capacity, and higher overall safety in the scenario of column collision test or other side collision.

[0080] Among them, the height of the second extension cavity is mainly defined by the space required for the installation of standard parts, and the width is designed to meet the space required for the bolt installation tool to define its width, ensuring that during assembly, a certain safety gap is retained between the standard parts and the cavity wall to avoid the risk of abnormal noise during driving. The specific values ​​are not limited.

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

[0082] In some embodiments, a fourth connection surface 1232 is disposed on the lower side of the second extension portion 123 , and a fifth connection surface 1214 is disposed on the lower side of the third cavity 1213 . The fourth connection surface 1232 and the fifth connection surface 1214 can be used to connect to a side pedal of a vehicle.

[0083] See also Figure 3 According to some embodiments of the present application, a fourth cavity 1233 is provided on the lower side of the second cavity 1212 , the size of the fourth cavity 1233 in the Y direction is the same as that of 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 the fourth cavity 1233 is arranged on the lower side of the second cavity 1212, so that the outer wall of the fourth cavity 1233 is connected to the lower wall of the third cavity 1213, thereby increasing the force transmission path, and the lower surface of the fourth cavity 1233 is flush with the lower surface of the first beam body 11, which facilitates the force transmission between the fourth cavity 1233 and the first beam body 11, plays a certain role in sharing the force of the third connecting surface 1231, enhances the bearing capacity of the third connecting surface 1231, and improves the stability of the entire structure, improves the overall rigidity, and improves 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 side wall of the main body 121 is flush with and connected to the upper side wall of the first beam body 11 , thereby improving the integrity and overall rigidity of the structure and facilitating the design of the height of the first extension portion 122 .

[0087] See also Figure 3 According to some embodiments of the present application, a plurality of transverse ribs 114 distributed along the Z direction and a plurality of vertical ribs 115 distributed along the Y direction are provided in the first beam body 11, the lower ends of the vertical ribs 115 are connected to the transverse ribs 114 located at the lowest end, the transverse ribs 114 located at the lowest end are spaced from the lower side wall of the first beam body 11 to form a fifth cavity 116, and the plurality of transverse ribs 114 and the plurality of vertical ribs 115 are staggered to divide the first beam body 11 except the fifth cavity 116 to form a plurality of sixth cavities 117.

[0088] Both the transverse ribs 114 and the vertical ribs 115 extend along the X-direction to divide the first beam body 11 into a plurality of cavities distributed along the Y-direction and the Z-direction. The vertical ribs 115 can increase the bearing capacity of the third connecting surface 1231 and the stiffness in the Z-direction. The transverse ribs 114 enhance the Y-direction strength of the first beam body 11 and improve the overall stiffness, thereby better protecting the battery during a side collision.

[0089] The third connection surface 1231 is located at the lower side of the fifth cavity 116. The fifth cavity 116 is provided to improve the bearing capacity of the third connection surface 1231. Since the fifth cavity 116 is a battery pack installation cavity and the battery pack is heavy, the width of the fifth cavity 116 is increased during design to increase the battery pack installation surface. This can effectively reduce the force borne by the battery pack installation point and avoid stress concentration at the installation point. The height design of the fifth cavity 116 is mainly to ensure that the upper inner wall of the fifth cavity 116 maintains a safe gap with the tightened bolts to avoid the risk of abnormal noise.

[0090] In some embodiments, a sixth connection surface 118 is provided at the upper end of the first beam body 11, and the sixth connection surface 118 can be used as the installation surface of the battery pack installation beam, so that the beam provides a Y-direction installation point for the battery pack, thereby reducing the stress on the third connection surface 1231 of the battery pack.

[0091] The sixth connection surface 118 may also be provided with a snap hole for connecting a cooling pipeline to enhance the stability of the cooling pipeline.

[0092] The embodiment of the present application also provides a vehicle frame, which is applied to a semi-load-bearing vehicle body 4 .

[0093] See also Figure 1 , Figure 2 and Figure 4 The vehicle frame includes a middle longitudinal beam 1, a front longitudinal beam 2 and a rear longitudinal beam 3 as in any of the above technical solutions.

[0094] First of all, it should be explained that because the frame of the embodiment of the present application includes the middle longitudinal beam 1 as any of the above-mentioned technical solutions, it has the technical characteristics and beneficial effects of the middle longitudinal beam 1 as any of the above-mentioned technical solutions, which will not be repeated here.

[0095] The front longitudinal beam 2 is connected to the front end of the first beam body 11, and at least a portion of the rear end of the front longitudinal beam 2 is wrapped outside the front end of the first beam body 11 and is connected to the front end of the first beam body 11 by bolts; the rear longitudinal beam 3 is connected to the rear end of the first beam body 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 body 11 and is connected to the rear end of the first beam body 11 by bolts.

[0096] By designing the connection points between the front and middle longitudinal beams 1 and the middle and rear longitudinal beams 3 as wrap-around connections, the connection structure is stable and has high rigidity, thus avoiding stress concentration and improving the rigidity of the entire vehicle.

[0097] In particular, due to considerations of bolt installation safety clearance, tool operation space, and restrictions on the cross-section of the rear longitudinal beam 3 , the second connection point at the rear end of the first beam body 11 is arranged in a staggered manner.

[0098] The embodiment of the present application also provides a vehicle. The vehicle includes a frame, a body 4 and a battery pack as described in the above technical solution, the body 4 includes a floor 41 and a threshold beam 42, the floor 41 is rigidly connected to the second connection surface 1221, the threshold beam 42 is rigidly connected to the third connection surface 1231; the battery pack is connected to the first connection surface 111.

[0099] The beneficial effects of the vehicle of the embodiment of the present application are the same as the beneficial effects of the frame of the above-mentioned technical solution, which will not be repeated here.

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

[0101] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0102] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

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

[0104] In the description of the present application, “plurality” means two or more.

[0105] In the description of the present application, a first feature being “on” or “under” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact with each other but are in contact with each other via another feature therebetween.

[0106] In the description of the present application, “above”, “over” and “above” a first feature to a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0107] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

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

Claims

1. A middle longitudinal beam, applied to a frame of a semi-unibody vehicle, characterized in that: The middle longitudinal beam comprises: A first beam body, used to be connected to the front longitudinal beam and the rear longitudinal beam of the frame, and the lower end of the first beam body is provided with a first connecting surface for being bolted to the battery pack; A second beam body, comprising a main body, a first extension and a second extension, wherein the main body is connected to the outer side of the first beam body in the Y direction, the first extension is arranged on the upper side of the main body, and the upper end of the first extension is provided with a second connection surface for connecting with the floor bolts of the vehicle body, and the second extension is arranged on the side of the main body away from the first beam body, and the upper end of the second extension is provided with a third connection surface for connecting with the door sill bolts of the vehicle body; Wherein, the first beam body and the second beam body are integrally formed of aluminum material.

2. The center longitudinal beam according to claim 1, characterized in that: The front end of the first beam body protrudes from the front end of the second beam body, and the rear end of the second beam body protrudes from the rear end of the first beam body.

3. The center longitudinal beam according to claim 2, characterized in that: A portion of the second beam body protruding from the first beam body is provided with a limiting surface, and the limiting surface is located on the outer side of the second beam body in the Y direction.

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

5. The center longitudinal beam according to claim 2, characterized in that: The second connecting surface is higher than the upper surface of the first beam body. An oblique rib is connected between the first extension portion and the first beam body. The oblique rib is provided in an overlapping area of ​​the first beam body and the second beam body in the X direction.

6. The middle longitudinal beam according to any one of claims 1 to 5, characterized in that: The main body comprises a first cavity, a second cavity and a third cavity extending along the X direction, and the three cavities are distributed in a herringbone shape; The first cavity is located at the upper side, the second cavity and the third cavity are located at the lower side of the first cavity and distributed along the Y direction, the first extension portion is connected to the upper surface of the first cavity, and the second extension portion is connected to the side surface of the third cavity; Among them, the size of the third cavity in the Z direction tends to decrease along the direction approaching the second extension portion, and the size of the second cavity in the Z direction is the same as the end of the third cavity close to the second cavity, and the size of the second extension portion in the Z direction is the same as the end of the third cavity close to the second extension portion.

7. The center longitudinal beam according to claim 6, characterized in that: A fourth cavity is provided at the lower side of the second cavity, the size of the fourth cavity in the Y direction is the same as that of the second cavity, and the lower surface of the fourth cavity 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.

8. The middle longitudinal beam according to any one of claims 1 to 5, 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 ends of the vertical ribs are connected to the transverse ribs located at the lowest end, the transverse ribs located at the lowest end are spaced from the lower side wall of the first beam body to form a fifth cavity, and the plurality of transverse ribs and the plurality of vertical ribs are staggered to divide the first beam body except the fifth cavity to form a plurality of sixth cavities.

9. A vehicle frame, applied to a semi-load-bearing vehicle body, characterized in that: The frame comprises: A center longitudinal beam according to any one of claims 1 to 8; A front longitudinal beam connected to the front end of the first beam body, wherein at least a portion of the rear end of the front longitudinal beam is wrapped outside the front end of the first beam body and is connected to the front end of the first beam body by bolts; The rear longitudinal beam is connected to the rear end of the first beam body. At least a portion of the front end of the rear longitudinal beam extends into the rear end of the first beam body and is connected to the rear end of the first beam body by bolts.

10. A vehicle, characterized in that: include: The frame as claimed in claim 9; A vehicle body, comprising a floor and a sill beam, wherein the floor is rigidly connected to the second connection surface, and the sill beam is rigidly connected to the third connection surface; A battery pack is connected to the first connection surface.

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