Suspension member assembly

Abstract

A suspension member assembly (70) is provided with a suspension member (30) provided with left and right side members (31L, 31R), a front cross member (34), and first and second rear cross members (32, 33), the length of the front cross member (34) in the front-rear direction of the vehicle being shorter than the length of the first and second rear cross members (32, 33) in the up-down direction of the vehicle, and a pole (60) provided to the rear of the front cross member (34) in the vehicle and above the first and second rear cross members (32, 33). The left and right side members (31L, 31R) are connected in the width direction, and each of the left and right side members (31L, 31R) has at least two fastening points (61L, 61R, 62L, 62R).

Description

Technical Field

[0001] This disclosure relates to the structure of a suspension component assembly mounted at the rear of a vehicle body. Background Technology

[0002] Japanese Patent Application Publication No. 2023-153497 discloses a hollow suspension frame component manufactured by casting a core, which is connected in a four-cornered frame shape. When a suspension frame component is constructed with a hollow core, the rigidity of parts that receive large loads, such as the suspension arms connected to the wheel carrier, may sometimes be insufficient. Therefore, the suspension frame component described in Japanese Patent Application Publication No. 2023-153497 includes internal reinforcing members. Summary of the Invention

[0003] Furthermore, battery electric vehicles (BEVs) with rear-wheel drive units integrated into the suspension system are being used. In such BEVs, a larger battery capacity is required. However, to accommodate the drive unit, the overall rigidity of the suspension system must be ensured; therefore, the front crossbeam is sometimes designed as a closed-section structure. However, when the front crossbeam is designed as a closed-section structure, the space for the battery becomes narrower by a factor corresponding to the length of the front crossbeam in the vehicle's longitudinal direction.

[0004] Therefore, the purpose of this disclosure is to ensure the rigidity of the suspension component assembly and to ensure the space for battery mounting.

[0005] The suspension assembly disclosed herein is a suspension assembly installed at the rear of a vehicle body. It is characterized by comprising a suspension component and a tower rod mounted on the suspension component. The suspension component is integrally formed by casting and includes: left and right side beams disposed on both sides of the rear of the vehicle and extending in the longitudinal direction; a front crossbeam connecting the front portions of the left and right side beams in the vehicle width direction; and a rear crossbeam connecting the rear portions of the left and right side beams in the vehicle width direction. The longitudinal length of the front crossbeam is shorter than its vertical length. The tower rod is located further rearward than the front crossbeam and higher than the rear crossbeam, connecting the left and right side beams in the vehicle width direction and having at least two fastening points with each of the left and right side beams.

[0006] By utilizing the front crossbeam and struts to surround the front and upper part of the suspension components, the rigidity of the front portion of the suspension components can be improved. Therefore, the front crossbeam is not a closed section, but rather a T-shaped structure with a length in the vehicle's longitudinal direction shorter than its vertical direction length, thus shortening the longitudinal length of the front crossbeam. This ensures sufficient space for battery mounting in front of the front crossbeam.

[0007] In the suspension component assembly disclosed herein, the left and right side beams may have an upper arm connecting portion for mounting the upper suspension arm at the center in the vehicle's longitudinal direction, and the tower rod may be located at a position closer to the front of the vehicle than the upper arm connecting portion.

[0008] This ensures the rigidity of the suspension components located further forward than the upper arm connection.

[0009] In the suspension component assembly disclosed herein, the length of the central portion of the front crossbeam in the vehicle width direction in the vehicle longitudinal direction may be shorter than its length in the vehicle vertical direction.

[0010] This ensures sufficient space for battery installation in the center of the vehicle's width direction.

[0011] In the suspension component assembly disclosed herein, the rear crossbeam may include a first rear crossbeam and a second rear crossbeam located at a position further forward of the vehicle than the first rear crossbeam.

[0012] This can improve the overall rigidity of the suspension assembly and suppress deformation modes such as flexing of the suspension assembly.

[0013] In the suspension component assembly disclosed herein, the second rear crossbeam may have a lower arm mounting portion for mounting the lower suspension arm.

[0014] Therefore, the second rear crossbeam can be used to receive the load from the coil springs input via the lower suspension arm.

[0015] In the suspension component assembly disclosed herein, the lower arm mounting portion may be a through hole located on the second rear crossbeam and extending along the vehicle's longitudinal direction.

[0016] This allows the load from the coil springs, input via the lower suspension arm, to be reliably transferred to the second rear crossbeam.

[0017] In the suspension component assembly disclosed herein, the left and right side beams may include an upper portion and a lower portion, wherein the lower portion is bent downwardly in such a way that a space is left between it and the upper portion.

[0018] As a result, the overall vertical height of the side beam increases, and the longitudinal bending rigidity of the side beam is improved, thereby enhancing the overall rigidity of the suspension assembly.

[0019] In the suspension component assembly disclosed herein, the upper portion may be formed by a groove-shaped structure that is open outward in the vehicle width direction.

[0020] This increases the longitudinal bending stiffness of the upper part.

[0021] In the suspension component assembly disclosed herein, the lower portion may be formed by a groove-shaped structure open on the lower side of the vehicle.

[0022] This increases the lateral bending stiffness of the lower part of the vehicle in the width direction.

[0023] In the suspension component assembly disclosed herein, the second rear crossbeam may extend from the lower surfaces of the left and right side beams and be a downwardly convex U-shaped structure.

[0024] This improves the torsional stiffness of the suspension component assembly.

[0025] This disclosure ensures the rigidity of the suspension component assembly and ensures the space for battery mounting. Attached Figure Description

[0026] Figure 1 This is a bottom view of the rear of a vehicle equipped with the suspension component assembly of the embodiment. Figure 2 This is a perspective view of the suspension component assembly of the implementation method, viewed from an oblique, upper rear view. Figure 3 This is a perspective view of the suspension component assembly of the implementation method, viewed from the upper front. Figure 4 This is a perspective view of the suspension component assembly of the implementation method, viewed from a lower rear angle. Figure 5 This is a top view of the suspension component assembly of the implementation method. Figure 6 This is a schematic cross-sectional view of the suspension component assembly according to the embodiment, and is... Figure 5 The AA section shown. Figure 7 This is a schematic cross-sectional view of the suspension component assembly according to the embodiment, and is... Figure 5 The BB cross section shown. Figure 8 This is a schematic longitudinal sectional view of the rear base of the suspension component assembly according to the embodiment, and is... Figure 5 The CC section shown. Figure 9 This is a schematic cross-sectional view of the suspension component assembly in the embodiment and is... Figure 5 The DD section shown. Detailed Implementation

[0027] The suspension assembly 70 of the embodiment will now be described. First, the vehicle 100 on which the suspension assembly 70 is mounted will be described. Furthermore, FR, UP, and RH shown in each figure represent the front, upper, and right sides of the vehicle 100 on which the suspension assembly 70 is mounted, respectively. The opposite directions of FR, UP, and RH represent the rear, lower, and left sides, respectively. Hereinafter, when only the front-to-back, left-to-right, and up-down directions are used in the description, unless otherwise specified, they will be considered to represent the front-to-back, left-to-right, and up-down directions of the vehicle 100. Furthermore, the front-to-back, left-to-right, and up-down directions of the vehicle 100 are the front-to-back, left-to-right, and up-down directions of the suspension assembly 70.

[0028] like Figure 1 As shown, the vehicle 100 includes a body 200 and a suspension assembly 70 mounted to the rear of the body 200. The suspension assembly 70 includes suspension components 30 and tower struts 60.

[0029] like Figure 1 As shown, the vehicle body 200 includes a rear unit 10, a central unit 17, and a front unit (not shown). The rear unit 10 constitutes the rear of the vehicle body 200, the central unit 17 constitutes the central portion of the vehicle body 200, and the front unit (not shown) constitutes the front of the vehicle body 200. The rear unit 10, the central unit 17, and the front unit are all die-cast products manufactured by integral casting. The drive unit 19 of the vehicle 100 is mounted on the rear unit 10.

[0030] The rear unit 10 includes left and right rear side beams 11L and 11R, left and right rear wheel arches 12L and 12R, and a rear floor 13.

[0031] The left and right rear side beams 11L and 11R are skeletal components located on the left and right sides of the rear unit 10 and extending along the vehicle's longitudinal direction. The rear side beams 11L and 11R can, for example, be a channel-shaped structure open outwards in the vehicle width direction and equipped with multiple reinforcing ribs. Coil spring seats 15L and 15R are provided on the left and right rear side beams 11L and 11R to hold the upper ends of the coil springs 22L and 22R. Left and right collision energy absorption boxes 14L and 14R are installed at the rear ends of the left and right rear side beams 11L and 11R. Rear bumper reinforcement 16 is installed at the rear ends of the left and right collision energy absorption boxes 14L and 14R. The rear bumper reinforcement 16 is a skeletal component that connects the rear ends of the left and right collision energy absorption boxes 14L and 14R in the vehicle width direction.

[0032] The left and right rear wheel arches 12L and 12R are semi-circular cross-section, arc-shaped plate-like parts that are connected to the outer side of the left and right rear side beams 11L and 11R in the vehicle width direction. The left and right rear wheel arches 12L and 12R house the rear wheels internally.

[0033] The rear floor section 13 is a plate component that connects the left and right rear side beam sections 11L and 11R.

[0034] The central unit 17 is connected to the front of the rear unit 10 by bolts or welding. A compartment (not shown) is mounted above the central unit 17. A battery pack 18 is mounted in the central unit 17. Figure 1 As shown, the battery pack 18 protrudes rearward toward the suspension member 30 from the center in the vehicle width direction. This protruding portion can accommodate auxiliary components of the battery pack 18 such as the junction box and ECU.

[0035] The suspension component 30 is integrally formed by casting and installed under the rear unit 10 of the vehicle body 200. The suspension component 30 is a four-corner frame-shaped component including left and right side beams 31L and 31R, a first rear crossbeam 32 and a second rear crossbeam 33 at the rear, and a front crossbeam 34 at the front. Here, the first rear crossbeam 32 and the second rear crossbeam 33 form a rear crossbeam at the rear of the suspension component 30 in the vehicle width direction, connecting the left and right side beams 31L and 31R. The front crossbeam 34 connects the left and right side beams 31L and 31R at the front of the suspension component 30 in the vehicle width direction.

[0036] The left and right side beams 31L and 31R are located on the left and right sides of the vehicle 100 and extend along the vehicle's longitudinal direction. At the front end of the left and right side beams 31L and 31R are left and right front body mounting portions 35L and 35R, which are mounted to the lower side of the left and right rear side beam portions 11L and 11R via mounting members. Furthermore, at the rear of the left and right side beams 31L and 31R are rear body mounting portions 36L and 36R, which are mounted to the lower side of the rear unit 10 via mounting members. Additionally, the left and right rear vehicle ends 37L and 37R of the left and right side beams 31L and 31R extend from the rear body mounting portions 36L and 36R toward the rear of the vehicle. The left and right rear vehicle ends 37L and 37R are located further rearward than the front vehicle ends of the left and right collision energy absorption boxes 14L and 14R.

[0037] like Figure 2 , Figure 3 As shown, the upper part of the left and right side beams 31L and 31R is provided with the first suspension upper arms 23L and 23R for the left and right sides (see reference). Figure 1 The left and right first upper arm connecting parts 45L, 45R and the left and right second suspension upper arms 24L, 24R are connected (see reference). Figure 1The left and right second upper arm connecting parts 46L and 46R are connected. The left and right first upper arm connecting parts 45L and 45R are located directly behind the left and right front body mounting parts 35L and 35R. In addition, the second upper arm connecting parts 46L and 46R are located at the center of the left and right side beams 31L and 31R in the vehicle longitudinal direction. The first upper arm connecting parts 45L and 45R and the second suspension upper arms 24L and 24R are each composed of two plate-shaped parts. In addition, as Figure 3 As shown, the upper part of the left and right side beams 31L and 31R is provided with left and right front bases 48L and 48R and left and right rear bases 49L and 49R for the tower rod 60 to be installed.

[0038] like Figure 3 As shown, the front crossbeam 34 is the part that connects the left and right front body mounting sections 35L and 35R in the vehicle width direction. Figure 4 As shown, the first rear crossbeam 32 is the portion that connects the left and right rear body mounting portions 36L and 36R in the vehicle width direction. The second rear crossbeam 33 is the portion located further forward of the vehicle than the first rear crossbeam 32 and connects the left and right side beams 31L and 31R in the vehicle width direction. As described later, the second rear crossbeam 33 is a U-shaped portion that extends downwardly from the lower surface of the left and right side beams 31L and 31R. Left and right lower arm mounting portions 39L and 39R are provided at the left and right ends of the second rear crossbeam 33 for mounting the suspension lower arms 21L and 21R.

[0039] like Figure 1 , Figure 5 As shown, multiple arms of left and right suspension devices 20L and 20R, which suspend the left and right rear wheels, are connected to the suspension frame 30. The suspension devices 20L and 20R consist of multiple arms connecting the steering knuckles of the left and right rear wheels to the suspension frame 30, coil springs 22L and 22R, and left and right shock absorbers (not shown). The vehicle-side ends of the left and right lower suspension arms 21L and 21R are connected to the left and right lower arm mounting portions 39L and 39R of the second rear crossbeam 33. Furthermore, left and right coil springs 22L and 22R are mounted on the upper parts of the left and right lower suspension arms 21L and 21R. The upper ends of the left and right coil springs 22L and 22R are held by coil spring seats 15L and 15R of the left and right rear side beam portions 11L and 11R. Additionally, as... Figure 5 As shown, the vehicle-side ends of the left and right first suspension upper arms 23L and 23R are connected to the first upper arm connecting portions 45L and 45R. Furthermore, the vehicle-side ends of the left and right second suspension upper arms 24L and 24R are connected to the second upper arm connecting portions 46L and 46R. It should be noted that the arms other than the left and right lower suspension arms 21L and 21R, the left and right first suspension upper arms 23L and 23R, and the left and right second suspension upper arms 24L and 24R are omitted from the illustrations and descriptions.

[0040] like Figure 3 , Figure 5 As shown, the tower 60 is a plate-shaped component connecting the left and right side beams 31L and 31R in the vehicle width direction. Multiple reinforcing ribs (not shown) are provided on the upper surface of the tower 60. The tower 60 is mounted to the left and right front bases 48L and 48R and the left and right rear bases 49L and 49R, which are located on the upper part of the left and right side beams 31L and 31R, using bolts 65. The fastening points of the front bases 48L and 48R and the left and right rear bases 49L and 49R constitute the left and right front fastening points 61L and 61R and the left and right rear fastening points 62L and 62R of the tower 60. Figure 3 , Figure 5 As shown, the tower 60 is located behind the front crossbeam 34 and above the first rear crossbeam 32 and the second rear crossbeam 33.

[0041] Next, refer to Figures 2 to 9 The structural details of the suspension component 30 and the tower 60 will be explained first.

[0042] As mentioned above Figure 1 As described, the suspension component 30 is a four-corner frame-shaped component including left and right side beams 31L and 31R, a first rear crossbeam 32, a second rear crossbeam 33, and a front crossbeam 34.

[0043] like Figures 2 to 5 As shown, the left side beam 31L includes an upper portion 41L and a lower portion 51L. The lower portion 51L is bent downwards in such a way that it leaves a space between itself and the upper portion 41L.

[0044] The upper portion 41L includes a front portion 42L, a connecting portion 42C, a central portion 43L, a rear portion 44L, and a rear end portion 37L. The front portion 42L extends diagonally upwards and backwards from the left front body mounting portion 35L to the rear of the first upper arm connecting portion 45L. The connecting portion 42C is connected to the front portion 42L and extends diagonally upwards and backwards from the rear of the first upper arm connecting portion 45L to the near front of the second upper arm connecting portion 46L. The central portion 43L is connected to the rear end of the connecting portion 42C, curves upwards, and extends horizontally towards the rear of the vehicle. The rear portion 44L is connected to the rear end of the central portion 43L and extends horizontally towards the rear of the vehicle to the rear body mounting portion 36L. As described above, the left rear end portion 37L extends horizontally towards the rear of the vehicle from the left rear body mounting portion 36L.

[0045] like Figure 6As shown, the central portion 43L is composed of a web 43A, an upper flange 43B, and a lower flange 43C, and has a slot-shaped shape that opens outwards (to the left) in the vehicle width direction. Similarly, the front portion 42L and the rear portion 44L also have slot-shaped shapes that open outwards (to the left) in the vehicle width direction. Therefore, the bending stiffness of the upper portions 41L and 41R about the X0 axis is greater than that about the Z0 axis. Here, the X0 axis is a coordinate axis in the vehicle width direction passing through the center of the cross-section of the upper portion 41L; the Z0 axis is a coordinate axis in the vertical direction passing through the center of the cross-section of the upper portion 41L. Furthermore, as Figure 2 , Figure 3 As shown, plate-shaped ribs 47 extending in the vehicle width direction (to the left of the vehicle) are provided at the front portion 42L and the rear portion 44L. A mounting portion 58L for mounting the drive unit 19 is provided at the rear of the central portion 43L. It should be noted that, as... Figure 3 , Figure 8 As shown, the connecting portion 42C has a slot-shaped opening on the upper side of the vehicle, and similar to the lower portion 51L described later, its bending stiffness about the Z2 axis is greater than its bending stiffness about the X2 axis. Here, as... Figure 8 As shown, the Z2 axis is a coordinate axis in the vertical direction passing through the center of the cross section of the connecting part 42C; the X2 axis is a coordinate axis in the vehicle width direction passing through the center of the cross section of the connecting part 42C.

[0046] like Figure 4 As shown, the lower left portion 51L includes a front end portion 52L, a rear end portion 54L, and a curved portion 53L. The front end portion 52L is connected to the lower side of the front portion 42L of the upper portion 41L. The rear end portion 54L is connected to the lower side of the rear portion 44L of the upper portion 41L. The curved portion 53L is a portion that curves downwards between the front end portion 52L and the rear end portion 54L. A cylindrical space 50L is created between the upper surface of the curved portion 53L and the lower surface of the central portion 43L of the upper portion 41L. Figure 6 As shown, space 50L is the space through which drive shaft 19A extends along the width direction of the vehicle.

[0047] like Figure 4 , Figure 6As shown, the curved portion 53L of the lower part 51L is composed of a web 53A, an inner flange 53B, and an outer flange 53C, and has a groove-shaped opening on the lower side of the vehicle. Therefore, the bending stiffness of the curved portion 53L about the Z1 axis is greater than its bending stiffness about the X1 axis. Here, the Z1 axis is a coordinate axis in the vertical direction passing through the center of the cross-section of the curved portion 53L; the X1 axis is a coordinate axis in the vehicle width direction passing through the center of the cross-section of the curved portion 53L. Similarly, the front end 52L and the rear end 54L also have a groove-shaped opening on the lower side of the vehicle, and their bending stiffness about the Z1 axis is greater than their bending stiffness about the X1 axis. Multiple plate-shaped ribs 55 extending in the vertical direction of the vehicle are provided at the front end 52L, the curved portion 53L, and the rear end 54L.

[0048] like Figure 3 , Figure 5 , Figure 7 As shown, the left front base 48L is positioned directly behind the left front body mounting portion 35L. The left front base 48L is a portion that protrudes inward in the vehicle width direction from the inner side of the front portion 42L between the two plate-shaped components constituting the first upper arm connecting portion 45L. The front base 48L has threaded holes for bolts 65 to be screwed in. Furthermore, the left rear base 49L is located at the center of the left side beam 31L in the vehicle longitudinal direction and is situated at the front end of the central portion 43L (the rear end of the connecting portion 42C). Figure 7 , Figure 8 As shown, the rear base 49L is a cylindrical portion disposed between the inner end of the front plate-shaped member in the vehicle width direction and the inner flange of the connecting portion 42C of the two plate-shaped members constituting the second upper arm connecting portion 46L. The rear base 49L is also provided with threaded holes for screwing in bolts 65.

[0049] The right side beam 31R is symmetrical to the left side beam 31L, and includes an upper portion 41R and a lower portion 51R. The upper portion 41R includes a front portion 42R, a connecting portion 42C, a central portion 43R, a rear portion 44R, and a rear end portion 37R of the vehicle, and is provided with a first upper arm connecting portion 45R, a second upper arm connecting portion 46R, a front base 48R, a rear base 49R, and a mounting portion 58R. In addition, the lower portion 51R includes a front end portion 52R, a rear end portion 54R, and a curved portion 53R.

[0050] like Figure 3 , Figure 7 As shown, the front crossbeam 34 has a T-shaped form with longitudinal plate 34A and transverse plate 34B. The front crossbeam 34 is curved so that its central portion in the vehicle width direction protrudes towards the rear of the vehicle. Furthermore, the longitudinal length of the central portion of the front crossbeam 34 in the vehicle width direction is shorter than its vertical length.

[0051] like Figure 3 , Figure 9As shown, the first rear crossbeam 32 is composed of a web 32A, an upper flange 32B, and a lower flange 32C, and has a slotted shape that opens at the rear of the vehicle. Therefore, the bending stiffness of the first rear crossbeam 32 about the Y3 axis is greater than its bending stiffness about the Z3 axis. Here, the Y3 axis is a coordinate axis in the vehicle's longitudinal direction passing through the center of the cross section of the first rear crossbeam 32; the Z3 axis is a coordinate axis in the vertical direction passing through the center of the cross section of the first rear crossbeam 32. Furthermore, the first rear crossbeam 32 is provided with a rib 32D extending from the web 32A toward the rear of the vehicle.

[0052] like Figure 4 , Figure 9 As shown, the second rear crossbeam 33 extends downward from the lower surfaces of the rear ends 54L and 54R of the left and right lower portions 51L and 51R, and is a frame portion that connects the left and right side beams 31L and 31R in the vehicle width direction. The second rear crossbeam 33 is composed of a left end 33L, a right end 33R, and a horizontal portion 33H. The left end 33L and the right end 33R are portions that extend downward from the lower surfaces of the rear ends 54L and 54R. The horizontal portion 33H is the portion that connects the left end 33L and the right end 33R in the vehicle width direction. The left end 33L, the right end 33R, and the horizontal portion 33H have a downwardly convex U-shaped shape.

[0053] The horizontal section 33H is composed of a web 33A, a front flange 33B, and a rear flange 33C, and has a slotted shape open to the lower side of the vehicle. Furthermore, a rib 33D extending from the web 33A towards the lower side of the vehicle is provided in the horizontal section 33H. Therefore, the bending stiffness of the second rear crossbeam 33 about the Z4 axis is greater than its bending stiffness about the Y4 axis. Here, the Z4 axis is a coordinate axis in the vertical direction passing through the center of the cross section of the second rear crossbeam 33; the Y4 axis is a coordinate axis in the longitudinal direction of the vehicle passing through the center of the cross section of the second rear crossbeam 33. Additionally, left and right lower arm mounting portions 39L and 39R are provided at the left and right ends of the horizontal section 33H. The left and right lower arm mounting portions 39L and 39R are through holes extending along the longitudinal direction of the vehicle. This allows the load from the left and right coil springs 22L and 22R to be reliably transmitted to the second rear crossbeam 33. Furthermore, the second rear crossbeam 33 can also reliably bear the load from the left and right coil springs 22L and 22R.

[0054] In the suspension assembly 70 described above, the front crossbeam 34 and the strut 60 planarly surround the front part and upper part of the front section of the suspension component 30, thereby improving the rigidity of the front section of the suspension component 30. Furthermore, the front crossbeam 34 is not a closed section, but rather a T-shaped structure in which its length in the vehicle's longitudinal direction is shorter than its length in the vehicle's vertical direction, thus shortening the longitudinal length of the front crossbeam 34. This ensures sufficient battery mounting space in front of the front crossbeam 34.

[0055] Furthermore, the front crossbeam 34 is curved so that its central portion protrudes toward the rear of the vehicle in the vehicle width direction. Therefore, the central portion of the battery pack 18 in the vehicle width direction, which protrudes toward the rear of the suspension member 30, can be accommodated in front of the front crossbeam 34.

[0056] In the suspension assembly 70 of the embodiment, the front of the tower rod 60 is fastened by bolts 65 to the left and right front bases 48L and 48R located directly behind the left and right front body mounting portions 35L and 35R. Furthermore, the rear of the tower rod 60 is fastened by bolts 65 to the left and right rear bases 49L and 49R located at the center of the left and right side beams 31L and 31R in the vehicle longitudinal direction. Thus, the tower rod 60 and the left and right side beams 31L and 31R have two fastening points: a front fastening point 61L and 61R, and a rear fastening point 62L and 62R. Therefore, the plate-shaped tower rod 60 and the left and right side beams 31L and 31R can be integrated, thereby improving the rigidity of the front portion of the suspension assembly 30.

[0057] Furthermore, in the suspension component assembly 70 of the embodiment, the tower rod 60 is located closer to the front of the vehicle than the second upper arm connecting portions 46L and 46R, which are located at the center of the left and right side beams 31L and 31R in the vehicle longitudinal direction. As a result, the tower rod 60 can improve the rigidity of the front part of the suspension component 30 closer to the front of the vehicle than the second upper arm connecting portions 46L and 46R.

[0058] Furthermore, the suspension components 30 of the suspension component assembly 70 of the embodiment have left and right spaces 50L and 50R, and the left and right side beams 31L and 31R, which have a large vertical height and high longitudinal bending rigidity, are connected to a first rear crossbeam 32, which is formed by a channel shape open at the rear of the vehicle and has high longitudinal bending rigidity. In addition, a second rear crossbeam 33 is connected to the lower surface of the left and right side beams 31L and 31R. This second rear crossbeam is a downwardly convex U-shape, open at the lower side of the vehicle, and has high lateral bending rigidity in the longitudinal direction of the vehicle. Therefore, the rigidity of the rear portion of the suspension component 30 can be improved.

[0059] Thus, the suspension assembly 70 utilizes the front crossbeam 34 and the tower rod 60 to planarly surround the front part and upper part of the front section of the suspension component 30, thereby increasing the rigidity of the front section of the suspension component 30. Furthermore, by connecting the first rear crossbeam 32 and the second rear crossbeam 33, which have different directions of higher rigidity, to the left and right side beams 31L and 31R, the rigidity of the rear section of the suspension assembly 70 is increased. This improves the overall rigidity of the suspension assembly 70. Consequently, it can suppress deformation modes such as overall deformation of the suspension assembly 70 or restore its original shape.

[0060] Furthermore, in the suspension component 30, the upper portions 41L and 41R of the left and right side beams 31L and 31R are formed by a channel shape that is open on the outer side or upper side of the vehicle in the width direction; the first rear crossbeam 32 is formed by a channel shape that is open at the rear of the vehicle. Additionally, the lower portions 51L and 51R of the left and right side beams 31L and 31R, and the second rear crossbeam 33 are formed by a channel shape that is open at the lower side of the vehicle. Therefore, by setting the mold demolding direction to the outer side in the width direction, the rear of the vehicle, and the vertical direction of the vehicle, the suspension component 30 can be formed by integral casting.

[0061] In the above description, the tower 60 is described as having two fastening points, front fastening points 61L and 61R and rear fastening points 62L and 62R, with the left and right side beams 31L and 31R, but it is not limited to this structure. For example, it can also be configured to have three or more fastening points with the left and right side beams 31L and 31R respectively.

[0062] This application claims priority to Japanese Application No. 2024-198723, filed on November 14, 2024, the entire contents of which, including the description, claims, drawings and abstract, are incorporated herein by reference.

Claims

1. A suspension component assembly, installed at the rear of a vehicle body, The suspension component assembly is characterized by having: Suspension components; and Tower, installed on the suspension component, The suspension components are integrally formed by casting and possess the following characteristics: The left and right side beams are located on both sides of the rear of the vehicle and extend in the front-rear direction; A front crossbeam, connecting the left and right side beams at the front of the vehicle in the vehicle width direction; and The rear crossbeam connects the left and right side beams at the rear of the vehicle in the vehicle width direction. The length of the front crossbeam in the longitudinal direction of the vehicle is shorter than its length in the vertical direction. The tower is located behind the vehicle and above the rear crossbeam, connecting the left and right side beams in the vehicle width direction, and having at least two fastening points with each of the left and right side beams.

2. The suspension component assembly according to claim 1, characterized in that: The left and right side beams have upper arm connecting parts at the center in the vehicle's longitudinal direction for connecting the upper suspension arm. The tower is positioned closer to the front of the vehicle than the upper arm connection.

3. The suspension component assembly according to claim 1, characterized in that: The length of the front crossbeam in the vehicle width direction at its central part is shorter than its length in the vehicle vertical direction.

4. The suspension component assembly according to claim 1, characterized in that: The rear crossbeam has: First rear crossbeam; and The second rear crossbeam is located on the front side of the vehicle, which is closer to the first rear crossbeam.

5. The suspension component assembly according to claim 4, characterized in that: The second rear crossbeam has a lower arm mounting portion for mounting the lower suspension arm.

6. The suspension component assembly according to claim 5, characterized in that: The lower arm mounting portion is a through hole located on the second rear crossbeam and extending along the front-rear direction of the vehicle.

7. The suspension component assembly according to any one of claims 1 to 6, characterized in that: The left and right side beams include an upper part and a lower part. The lower portion bends downward in such a way that it leaves a space between itself and the upper portion.

8. The suspension component assembly according to claim 7, characterized in that: The upper part is formed by a groove shape that opens outward in the width direction of the vehicle.

9. The suspension component assembly according to claim 7, characterized in that: The lower portion is formed by a groove-shaped opening on the lower side of the vehicle.

10. The suspension component assembly according to any one of claims 4 to 6, characterized in that: The second rear crossbeam extends from the lower surfaces of the left and right side beams and is a U-shaped beam that bulges downward.

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