阅读说明：本技术 压铸铝制托架 (Die-casting aluminium bracket ) 是由 吉川重孝 渡边晃 河内僚 于 2019-07-04 设计创作，主要内容包括：本发明提供一种车辆用的压铸铝制托架,设置在搭载物与车辆构造体之间。所述车辆用的压铸铝制托架包括：第1安装部,以与所述搭载物连接的方式构成；和第2安装部,以与所述车辆构造体连接的方式构成,所述第1安装部的在连接有所述搭载物时与所述搭载物接触的第一面具有露出了所述托架的内部的层的冷硬层除去部,所述第1安装部的与所述第一面相反的一侧的第二面具有冷硬层。(The invention provides a die-cast aluminum bracket for a vehicle, which is arranged between a carrying object and a vehicle structure. The die-cast aluminum bracket for a vehicle includes: a 1 st mounting part configured to be connected to the mount; and a 2 nd mounting part configured to be connected to the vehicle structure, wherein a first surface of the 1 st mounting part, which is in contact with the mounting object when the mounting object is connected thereto, has a chilled layer removing part that exposes a layer inside the bracket, and a second surface of the 1 st mounting part, which is opposite to the first surface, has a chilled layer.)

1. A die-cast aluminum bracket used in a vehicle and provided between a vehicle structure and a load, characterized by comprising:

a 1 st mounting part configured to be connected to the mount; and

a 2 nd mounting part configured to be connected to the vehicle structure,

a first surface of the first mounting portion 1 facing the mount when the mount is connected has a cold-hard layer removed portion in which a layer inside the bracket is exposed,

and a second surface of the 1 st installation part, which is opposite to the first surface, is provided with a cold-hard layer.

2. The die-cast aluminum bracket according to claim 1,

the chilled layer of the second side has a larger area than the area of the chilled layer of the first side.

3. The die-cast aluminum bracket according to claim 1,

when the first surface and the second surface are viewed from a direction perpendicular to the first surface, the area of the chilled layer of the second surface is larger than the area of the chilled layer of the first surface.

4. The die-cast aluminum bracket according to any one of claims 1 to 3,

the 1 st mounting part is provided with a mounting hole, a bolt for connecting the 1 st mounting part and the carried object is embedded in the mounting hole,

the chilled layer removed portion is provided so as to surround the outer periphery of the mounting hole.

Technical Field

The present invention relates to die cast aluminum brackets.

Background

For example, japanese patent application laid-open No. 2017-074819 discloses a mounting structure for a vehicle provided between a module frame on which a fuel cell is mounted and a vehicle body of a fuel cell vehicle.

In such a mounting structure, a function of breaking when a large load is applied is sometimes required so as to be a failure mode intended for design at the time of collision of the vehicle. On the other hand, a function for ensuring the strength against the vibration applied in the normal time is also required. Therefore, a mounting structure that combines the above-described functions is desired.

Disclosure of Invention

The die-cast aluminum bracket according to the aspect of the present invention is a bracket for a vehicle provided between a mount and a vehicle structure. The die-cast aluminum bracket includes: a 1 st mounting part configured to be connected to the mount; and a 2 nd mounting part configured to be connected to the vehicle structure, wherein a first surface of the 1 st mounting part facing the mount when the mount is connected has a chilled layer removing part that exposes a layer inside the bracket, and a second surface of the 1 st mounting part opposite to the first surface has a chilled layer.

According to the above aspect, the strength against vibration applied at normal times can be secured by the chilled layer, and the portion removed from the chilled layer can be easily broken when a large load is applied at the time of collision of the vehicle, so that a failure mode that is desired in terms of design can be formed.

In the above aspect, the area of the chilled layer of the second surface may be larger than the area of the chilled layer of the first surface. In the above aspect, when the first surface and the second surface are viewed in a direction perpendicular to the first surface, the area of the chilled layer of the second surface may be larger than the area of the chilled layer of the first surface.

According to the above configuration, when a large load is applied at the time of collision of the vehicle, the cold-hardened layer can be easily broken from the surface having a small number of cold-hardened layers.

In the above aspect, the 1 st mounting portion may be provided with a mounting hole into which a bolt for connecting the 1 st mounting portion to the mount is fitted, and the chilled layer removed portion may be provided so as to surround an outer periphery of the mounting hole.

According to the above configuration, the tensile strength of the 1 st attaching part around the attaching hole having low rigidity can be reduced, and therefore, the 1 st attaching part can be more easily broken when a large load is applied at the time of collision of the vehicle.

The present invention can be realized in various forms other than the die-cast aluminum bracket for a vehicle. For example, the present invention can be realized as a mounting structure for a vehicle.

Features, advantages, technical and industrial significance of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings, in which like numerals represent like parts.

Drawings

Fig. 1 is an explanatory view showing a schematic configuration of a fuel cell vehicle.

Fig. 2 is a schematic cross-sectional view showing a schematic configuration of the front attachment portion.

Fig. 3 is a schematic cross-sectional view showing a schematic structure of the rear mounting portion.

Fig. 4 is an explanatory view showing a form of the rear bracket.

Fig. 5 is an explanatory diagram showing the area of the cold hard layer at the time of projection.

Fig. 6 is an explanatory diagram of a case where a large downward load acts on the rear mounting portion.

Fig. 7 is an explanatory diagram of a case where a small downward load acts on the rear mounting portion.

Fig. 8 is an explanatory diagram of a case where a small upward load acts on the rear mounting portion.

Detailed Description

A. Embodiment 1

Fig. 1 is an explanatory view showing a schematic configuration of a vehicle 10 on which a die-cast aluminum bracket for a vehicle in embodiment 1 is mounted. In fig. 1, 3 directions X, Y, Z are shown that are perpendicular to each other. The X direction is the front-rear direction of the vehicle 10, the Y direction is the width direction of the vehicle 10, and the Z direction is the up-down direction of the vehicle 10. These directions are also illustrated in other figures as desired. The vehicle 10 of the present embodiment is a fuel cell vehicle. The vehicle 10 may be a gasoline vehicle, a diesel vehicle, a hybrid vehicle, or an electric vehicle.

The vehicle 10 includes a vehicle body 15, front wheels FW, and rear wheels RW. The front wheel FW and the rear wheel FW are provided in the number of 1 on the left and right, respectively. The vehicle body 15 includes a front chamber 20, a vehicle chamber 30, and a floor lower portion 40. The front room 20 is partitioned from the vehicle room 30 and the underfloor 40 by an instrument panel DB. The vehicle cabin 30 and the floor lower portion 40 are partitioned by a floor panel FP.

In the front chamber 20, a fuel cell module 100 including a fuel cell 110 as an electric power source of the fuel cell vehicle is provided. The cabin 30 is a space on which a driver or the like of the vehicle 10 rides. A hydrogen tank 140 that stores hydrogen gas for supplying power generated by the fuel cell 110 is provided in the floor lower portion 40. A drive motor 150 is provided between the left and right rear wheels RW. The drive motor 150 receives electric power from the fuel cell 110 and generates drive power. The driving force generated by the driving motor 150 is transmitted to the rear wheels RW via a drive shaft, not shown, to drive the vehicle 10. Further, the vehicle 10 may be front-wheel drive. The drive motor 150 may be configured as an in-wheel motor housed in the rear wheels RW (or the front wheels FW).

The fuel cell module 100 includes a fuel cell 110, a stack case 120, and a support frame 130. The fuel cell 110 is housed in a box-shaped cell stack case 120 together with a boost converter for the fuel cell 110 and the like. The lower surface of the battery pack case 120 is supported by the support frame 130. The support frame 130 has high rigidity in order to support the stack case 120 that houses the relatively heavy fuel cell 110 and the like. The support frame 130 is disposed to be inclined with respect to the horizontal direction such that the rear end of the support frame 130 is positioned lower than the front end of the support frame 130.

A front attachment 200 is provided near the front end of the support frame 130. The front end of the support frame 130 is supported by the front mounting portion 200. A rear mounting portion 300 is provided near the rear end of the support frame 130. The rear end of the support frame 130 is supported by the rear mounting part 300. The front attachment portion 200 and the rear attachment portion 300 will be described in detail later (see fig. 2 and 3).

Suspension members 160 are provided on the left and right sides of vehicle 10 in front chamber 20, respectively. The suspension member 160 is a member constituting a part of the vehicle body 15. Each suspension member 160 extends in the front-rear direction. The suspension member 160 has a flexed configuration such that the rear end of the suspension member 160 is positioned lower than the front end of the suspension member 160. A front attachment portion 200 is connected to the upper suspension member 160 near the front end thereof, and a rear attachment portion 300 is connected to the lower suspension member 160 near the rear end thereof.

Fig. 2 is a schematic cross-sectional view showing a schematic configuration of a front attachment portion 200 in the present embodiment. Vehicle 10 includes a pair of front attachment portions 200, and each front attachment portion 200 is provided on the left and right sides of vehicle 10. Each front attachment portion 200 includes a front attachment body 210 and a front bracket 220. The suspension member 160 is connected to the lower side of the front mounting body 210. The upper side of the front mounting body 210 is connected to the support frame 130 via a front bracket 220. The suspension member 160, the front mounting body 210, the front bracket 220, and the support frame 130 are connected by bolts.

The front attachment body 210 has a structure in which an elastic member such as rubber is housed in a case made of metal such as steel or aluminum alloy. A viscous fluid may also be enclosed in the elastic member. The front mounting body 210 has a function of supporting the support frame 130 via the front bracket 220, and a function of suppressing transmission of vibration from the suspension member 160 to the support frame 130.

The front bracket 220 is a bracket for connecting the support frame 130 and the front mounting body 210. The front bracket 220 is made of metal such as steel or aluminum alloy.

Fig. 3 is a schematic cross-sectional view showing a schematic configuration of the rear attachment portion 300 in the present embodiment. The vehicle 10 includes a pair of rear mounting portions 300, and each of the rear mounting portions 300 is provided on the left and right sides of the vehicle 10. Each rear mounting portion 300 includes a rear mounting body 310 and a rear bracket 320. The lower side of the rear mounting body 310 is connected to the suspension member 160. The upper side of the rear mounting body 310 is connected to the support frame 130 via a rear bracket 320. The suspension member 160, the rear mounting body 310, the rear bracket 320, and the support frame 130 are each connected by bolts.

The rear attachment body 310 has a structure in which an elastic member such as rubber is housed in a case made of metal such as steel or aluminum alloy. A viscous fluid may also be enclosed in the elastic member. The rear mounting body 310 has a function of supporting the support frame 130 via the rear bracket 320, and a function of suppressing transmission of vibration from the suspension member 160 to the support frame 130.

Fig. 4 is a perspective view showing a form of the rear bracket 320 in the present embodiment. In the present embodiment, the rear brackets 320 provided on the left and right sides of the vehicle 10 have a bilaterally symmetrical shape. In the vehicle 10, the rear brackets 320 provided on the left and right sides may not have a symmetrical shape. In fig. 4, a left rear bracket 320 in the vehicle 10 is shown as a representative. The rear bracket 320 is a die-cast aluminum bracket provided between the mount and the vehicle structure. In the present description, the "mounted object" refers to all mounted objects mounted on the vehicle 10, including the fuel cell module 100, the driving motor 150, and other electronic devices, for example. When the vehicle 10 is a gasoline car or the like, the vehicle may include an engine and engine accessories as well. The "vehicle structure" refers to all structures constituting the vehicle 10 including, for example, the vehicle body 15, the chassis, and the like.

The rear bracket 320 in the present embodiment is a bracket for connecting the support frame 130 of the fuel cell module 100 as a mounted object and the rear attachment main body 310 as a vehicle structure. The rear bracket 320 of the present embodiment includes a 1 st attachment portion 321 and a 2 nd attachment portion 322.

The 1 st mounting portion 321 has a 1 st plate-like portion 321P in a flat plate shape connected to the support frame 130 of the fuel cell module 100 as a mounted object. The 1 st plate-like portion 321P is formed with two 1 st mounting holes 327 into which bolts for connection to the support frame 130 are fitted. The number of the 1 st mounting holes 327 may be 1, or 3 or more. In addition, a thinning hole 329 is formed between the two 1 st mounting holes 327 in the 1 st plate-like portion 321P. The thinning hole 329 is, for example, a hole provided for achieving weight reduction of the rear bracket 320 and for forming a desired sectional rigidity. The thinning hole 329 may not be formed in the 1 st plate-like portion 321P. The upper surface of the 1 st mounting portion 321 has a flat shape so as to follow the lower surface of the support frame 130.

The 2 nd mounting portion 322 has a flat plate-like 2 nd plate-like portion 322P connected to the suspension member 160 of the vehicle body 15 via the rear mounting body 310. The 2 nd plate-like portion 322P is formed with a 2 nd mounting hole 328 into which a bolt for connecting the rear mounting body 310 is fitted. The 2 nd mounting portion 322 is provided on the outer side in the width direction (Y direction) of the vehicle 10 with respect to the 1 st mounting portion 321. The 2 nd mounting portion 322 is provided below the 1 st mounting portion 321. The lower surface of the 2 nd mounting part 322 is formed along the upper surface of the rear mounting body 310, and the rear mounting body 310 is inclined such that the upper surface faces inward. Therefore, the pair of left and right rear brackets 320 connected to the support frame 130 are less likely to be displaced in the left-right direction in the pair of left and right rear mounting bodies 310.

A body 323 is provided between the 1 st mounting part 321 and the 2 nd mounting part 322. The main body 323 has a plate-like shape. The body 323 supports the 1 st mounting portion 321 above the 2 nd mounting portion 322. The main body 323 is inclined with respect to the vertical direction. The upper end portion of the main body portion 323 is continuous with the outer end portion of the 1 st mounting portion 321 in the width direction (Y direction) of the vehicle 10. The lower end portion of the main body portion 323 is connected to the end portion of the 2 nd mounting portion 322 on the inner side in the width direction (Y direction) of the vehicle 10. Therefore, the 1 st mounting portion 321 has a shape protruding from the upper end portion of the body portion 323 toward the inside in the width direction (Y direction) of the vehicle 10, and the 2 nd mounting portion 322 has a shape protruding from the lower end portion of the body portion 323 toward the outside in the width direction (Y direction) of the vehicle 10.

In the rear bracket 320 of the present embodiment, in order to ensure bending rigidity about an axis parallel to the front-rear direction (X direction) of the vehicle 10, a 1 st bead 324a is provided that connects the lower surface of the 1 st mounting portion 321 and the main body portion 323. The 1 st rib 324a has a plate-like shape. The 1 st bead 324a is provided near the center of the rear bracket 320 in the front-rear direction (X direction) of the vehicle 10. The rear bracket 320 is provided with a 2 nd bead 324b and a 3 rd bead 324c that connect the upper surface of the 2 nd mounting portion 322 to the main body portion 323. The 2 nd and 3 rd beads 324b and 324c have a plate shape. The 2 nd bead 324b is provided at the front side end portion of the rear bracket 320 in the front-rear direction (X direction) of the vehicle 10. The 3 rd beads 324c are provided at the rear side end portion of the rear bracket 320 in the front-rear direction (X direction) of the vehicle 10.

The plate thickness of the 1 st plate-shaped portion 321P, the main body portion 323, the 2 nd plate-shaped portion 322P, the 1 st bead 324a, the 2 nd bead 324b, and the 3 rd bead 324c in the rear bracket 320 of the present embodiment is about 10 to 15 mm. The outer surface of the rear bracket 320 of the present embodiment is covered with a chilled layer except for a chilled layer removed portion 325 described later. The cold-hardened layer is a layer that is harder than the inner layer and has a dense structure on the outer surface of the die-cast aluminum product by rapidly cooling the metal mold when the molten aluminum alloy is injected into the metal mold in the manufacturing process of the die-cast aluminum product. The thickness of the cold-hardened layer depends on the manufacturing conditions such as the mold temperature, but is about 0.5 mm. The cold-hardened layer has higher tensile strength and fatigue strength than the inner layer.

The rear bracket 320 of the present embodiment has a chilled layer removal portion 325, which is made of a material that exposes the inside of the rear bracket 320, on the surface (upper surface) of the 1 st mounting portion 321 that is the side facing the support frame 130 when the support frame 130 of the fuel cell module 100 as a mounted object is connected. The lower surface of the 1 st installation part 321 has a chilled layer. In the present embodiment, the cold-hardened layer removed portion 325 is provided over the entire upper surface of the 1 st mounting portion 321. Therefore, the chilled layer removed portion 325 is provided so as to surround the outer periphery of the 1 st mounting hole 327 on the upper surface of the 1 st mounting portion 321. The cold hard layer removed portion 325 of the present embodiment is formed by cutting the cold hard layer on the upper surface of the 1 st mounting portion 321 using a milling machine or the like. Whether the cold-hardened layer or the cold-hardened layer removed portion 325 is formed can be examined by comparing the respective hardnesses by the vickers hardness test (JISZ 2244). This is because the chilled layer has a denser structure than the chilled layer removed portion 325 and is thus harder. When the test force is 10kgf (98N), the Vickers hardness of the cold-hardened layer removed portion 325 is 90HV to 100HV, and the Vickers hardness of the cold-hardened layer is 120HV to 130 HV. That is, the vickers hardness of the cold hardened layer is 1.20 to 1.44 times the vickers hardness of the cold hardened layer removed portion 325.

Fig. 5 is an explanatory diagram showing the area of the cold hard layer when the upper surface of the 1 st attaching part 321 of the rear bracket 320 and the surface on the opposite side (lower surface) to the upper surface of the 1 st attaching part 321 are projected in the direction perpendicular to the upper surface of the 1 st attaching part 321 (as viewed from the direction perpendicular to the upper surface of the 1 st attaching part 321). The lower surface of the projected 1 st mounting portion 321 also includes a projected portion of a chamfered portion formed between the lower surface of the 1 st mounting portion 321 and the main body portion 323, and a projected portion of the 1 st bead 324 a. In the rear bracket 320 of the present embodiment, the chilled layer removed portion 325 is formed over the entire upper surface of the 1 st mounting portion 321, and therefore does not have a chilled layer. On the other hand, the lower surface of the 1 st mounting portion 321 is formed with a chilled layer over the entire area. That is, the surface of the lower side of the 1 st mounting part 321 has a larger area of the cold-hardened layer than the upper surface of the 1 st mounting part 321. When the upper surface of the 1 st mounting portion 321 and the lower surface of the 1 st mounting portion 321 are projected in a direction perpendicular to the upper surface of the 1 st mounting portion 321, the area of the chilled layer on the lower surface of the 1 st mounting portion 321 is larger than that on the upper surface of the 1 st mounting portion 321.

Fig. 6 is an explanatory diagram of a case where a large downward load (for example, about 30 kN) acts on the rear attachment portion 300. For example, when the vehicle 10 undergoes a frontal collision, the rear mounting portion 300 is pulled downward by the deformation of the suspension member 160. When a downward load acts on the rear mounting portion 300, the 1 st mounting portion 321 of the rear bracket 320 is bent to protrude upward in fig. 6, and therefore, a tensile stress acts on the upper surface of the 1 st mounting portion 321, and a compressive stress acts on the lower surface of the 1 st mounting portion 321. Since the cold-hardened layer-removed portion 325 having a lower tensile strength than the cold-hardened layer is provided on the upper surface of the 1 st attaching portion 321 to which a tensile stress is applied and the cold-hardened layer is provided on the lower surface of the 1 st attaching portion 321 to which a compressive stress is applied, the 1 st attaching portion 321 is likely to break at the cold-hardened layer-removed portion 325. Therefore, the rear bracket 320 of the present embodiment is broken at a cross section including the 1 st mounting hole 327 (a desired breaking cross section shown in fig. 6) when the vehicle 10 has a frontal collision, for example.

Fig. 7 is an explanatory diagram of a case where a small downward load (for example, about 1 to 3 kN) acts on the rear attachment portion 300. Fig. 8 is an explanatory diagram in a case where a small upward load (for example, about 1 to 3 kN) acts on the rear attachment portion 300. In a normal state during traveling of the vehicle 10, the rear mounting portion 300 is repeatedly stretched in the vertical direction and compressed in the vertical direction by the suspension member 160 and the support frame 130 due to a protrusion from the road surface and inertia acting on the fuel cell module 100. When a downward load acts on the rear attachment portion 300, the 1 st attachment portion 321 of the rear bracket 320 is bent so as to protrude upward in fig. 7, as in the case of the frontal collision described above, and therefore, a tensile stress acts on the upper surface of the 1 st attachment portion 321, and a compressive stress acts on the lower surface of the 1 st attachment portion 321. On the other hand, when a load is applied upward to the rear mounting portion 300, the 1 st mounting portion 321 of the rear bracket 320 bends so as to protrude downward in fig. 8 in contrast to the deformation at the time of the frontal collision, and therefore a compressive stress acts on the upper surface of the 1 st mounting portion 321 and a tensile stress acts on the lower surface of the 1 st mounting portion 321. A cold-hardened layer-removed portion 325 having a tensile strength and a fatigue strength smaller than those of the cold-hardened layer is provided on the upper surface of the 1 st attaching portion 321, and the cold-hardened layer is provided on the lower surface of the 1 st attaching portion 321. Therefore, as compared with the case where the cold-hardened layer-removed portions 325 are provided on both surfaces of the 1 st attaching portion 321, the tensile strength and fatigue strength of the 1 st attaching portion 321 are suppressed from being lowered. Therefore, the rear bracket 320 of the present embodiment is less likely to be broken by vibration that normally acts, as compared to the case where the cold and hard layer removed portions 325 are provided on both surfaces of the 1 st mounting portion 321.

According to the rear bracket 320 of the die-cast aluminum bracket for a vehicle of the present embodiment described above, it is possible to achieve a failure mode that is intended for design, because the strength against vibration applied at normal times can be secured by the chilled layer, and also, when a large load is applied at the time of collision of the vehicle 10, the rear bracket can be easily broken from the chilled layer removed portion 325. In particular, in the present embodiment, when the vehicle 10 is involved in a frontal collision, the 1 st mounting portion 321 of the rear bracket 320 is broken, and therefore, it is possible to prevent the suspension member 160 between the front mounting portion 200 and the rear mounting portion 300 from being supported by the support frame 130 and from being easily crushed. Therefore, it is possible to suppress the energy absorption for the collision by the deformation of the suspension member 160 from being hindered.

In the present embodiment, when projected in a direction perpendicular to the upper surface of the 1 st mounting portion 321, the surface on the opposite side (lower surface) of the upper surface of the 1 st mounting portion 321 has a larger area of the chilled layer than the upper surface of the 1 st mounting portion 321. Therefore, when a large load is applied to the rear bracket 320 at the time of collision of the vehicle 10, the first mounting portion 321 having a small area of the cold-hardened layer can be easily broken from the upper surface thereof.

In the present embodiment, around the 1 st mounting hole 327 having low rigidity, a cold-hardened layer removed portion 325 having low tensile strength is provided. Therefore, when a large load is applied to the rear bracket 320 at the time of collision of the vehicle 10, the 1 st mounting portion 321 can be more easily broken.

B. Another embodiment mode 1

The rear bracket 320, which is a die-cast aluminum bracket for a vehicle in the above embodiment, has the chilled layer removed portion 325 on the upper surface of the 1 st mounting portion 321. In contrast, in the die-cast aluminum bracket for a vehicle, the first mounting portion 321 may have a chilled layer removed portion 325 on a part of the surface (lower surface) opposite to the upper surface. Even in this case, the strength against vibration applied at normal times can be secured to the rear bracket 320 by the cold hard layer, and the rear bracket 320 can be easily broken from the cold hard layer removed portion 325 when a large load is applied to the rear bracket 320 at the time of collision of the vehicle 10.

C. Another embodiment 2

In the rear bracket 320, which is a die-cast aluminum bracket for a vehicle in the above-described embodiment, the chilled layer removed portion 325 is provided over the entire upper surface of the 1 st mounting portion 321. In contrast, in the die-cast aluminum bracket for a vehicle, the first mounting portion 321 may not have the entire upper surface thereof, but may have the chilled layer removed portion 325 in at least a part of the upper surface of the first mounting portion 321. Even in this case, when a large load is applied to the rear bracket 320 at the time of collision of the vehicle 10, the rear bracket 320 can be easily broken from the cold hardened layer removed portion 325.

D. Another embodiment 3

In the rear bracket 320, which is a die-cast aluminum bracket for a vehicle in the above-described embodiment, the chilled layer removed portion 325 is provided so as to surround the outer periphery of the 1 st mounting hole 327 on the upper surface of the 1 st mounting portion 321. In contrast, the die-cast aluminum bracket for a vehicle may be provided with the cold-hardened layer removed portion 325 on at least a part of the upper surface of the 1 st mounting portion 321, instead of providing the cold-hardened layer removed portion 325 so as to surround the outer periphery of the 1 st mounting hole 327. Even in this case, when a large load is applied to the rear bracket 320 at the time of collision of the vehicle 10, the rear bracket 320 can be easily broken from the cold hardened layer removed portion 325.

E. Another embodiment mode 4

In the rear bracket 320, which is a die-cast aluminum bracket for a vehicle in the above-described embodiment, the body portion 323 is provided between the 1 st mounting portion 321 and the 2 nd mounting portion 322. In contrast, the die-cast aluminum bracket for a vehicle may be formed by directly connecting the 1 st mounting portion 321 and the 2 nd mounting portion 322 without providing the main body portion 323 between the 1 st mounting portion 321 and the 2 nd mounting portion 322.

F. Another embodiment 5

The rear bracket 320, which is a die-cast aluminum bracket for a vehicle in the above embodiment, includes the 1 st, 2 nd, and 3 rd reinforcing ribs 324a, 324b, and 324 c. In contrast, the die-cast aluminum bracket for a vehicle may not have the 1 st, 2 nd, and 3 rd reinforcing ribs 324a, 324b, and 324 c.

Features of the techniques in the present embodiment can be appropriately replaced and combined. In addition, the deletion can be appropriately performed.