Vehicle underbody structure

Abstract

The invention provides a vehicle underbody structure which can well prevent water from entering. The vehicle underbody structure includes a power unit case, an upper surface of the power unit case is formed as a floor surface, and the power unit case includes a front seal portion provided at a front end portion and a rear seal portion provided at a rear end portion, in which the heights of the front seal portion and the rear seal portion in a vehicle vertical direction are set to be the same.

Description

Technical Field

[0001] The invention relates to a vehicle bottom structure. Background Art

[0002] In order to allow the elderly, the disabled, and children, who are relatively vulnerable groups, to use a sustainable transportation system, efforts are made to provide a means of transportation with better vehicle comfort. In the prior art, the floor surface of the vehicle bottom structure includes structures such as a floor tunnel and bending structures such as an end tilt in the vehicle width direction. Therefore, it is difficult to completely seal it on a non-flat surface to prevent water intrusion. In order to solve the above-mentioned problems, the present invention aims to improve the rideability of the vehicle and further provide a sustainable transportation system. Summary of the invention

[0003] The invention provides a vehicle bottom structure which can well prevent water from intruding.

[0004] The vehicle bottom structure of the present invention includes a power unit housing, the upper surface of which is formed as a floor surface, and the power unit housing includes a front sealing portion arranged at the front end portion, and a rear sealing portion arranged at the rear end portion, wherein the height of the front sealing portion and the rear sealing portion in the up and down direction of the vehicle are set to be the same.

[0005] In an embodiment of the present invention, the power unit housing further includes a side sealing portion provided at a side end portion, and the front sealing portion, the side sealing portion, and the rear sealing portion are continuously connected and formed on the same plane to form a first sealing surface.

[0006] In an embodiment of the present invention, a side panel is formed on a side of the power unit housing, the side panel and the first sealing surface form a coplanar surface, and the side sealing portion is provided on the side panel.

[0007] In an embodiment of the present invention, the power unit housing also includes a first storage portion and a second storage portion, the second storage portion is arranged further rearward than the first storage portion in the front-rear direction of the vehicle, and the upper surface of the second storage portion is formed to be higher than the upper surface of the first storage portion in the upper-lower direction of the vehicle, the second storage portion includes a flange portion, the flange portion and the first storage portion are set to have the same height in the upper-lower direction of the vehicle, and the flange portion is joined to the side panel.

[0008] In an embodiment of the present invention, a side beam is provided on the outer side of the side panel in the vehicle width direction, and the bottom of the side beam in the vehicle up and down direction includes a second sealing surface and a fixing surface, and the second sealing surface is located on the inner side in the vehicle width direction and above the vehicle up and down direction relative to the fixing surface.

[0009] In an embodiment of the present invention, the bottom of the side beam also includes a longitudinal wall, which extends along the up and down direction of the vehicle to connect the second sealing surface and the fixing surface, and a reinforcement is provided inside the side beam, and the longitudinal wall is connected to the lower end of the reinforcement.

[0010] In an embodiment of the present invention, the side panel is formed with a hollow closed cross section below the side beam in the vehicle up-down direction, and a jacking member is provided inside the closed cross section.

[0011] In an embodiment of the present invention, the fixing surface of the side beam is fixed to the side panel via a fastening component, and the lifting component is disposed close to the fastening component.

[0012] In an embodiment of the present invention, the vehicle bottom structure also includes a lower front panel, which is arranged in front of the power unit housing in the front-to-rear direction of the vehicle; and a front component, which is arranged below the lower front panel in the up-down direction of the vehicle, wherein a front fixing portion is arranged near the front sealing portion, and the front fixing portion integrally fixes the power unit housing, the lower front panel, and the front component.

[0013] In an embodiment of the present invention, the power unit housing also includes a front longitudinal wall, which extends from the front of the front sealing portion in the vehicle front-to-rear direction toward the bottom of the vehicle up-down direction, and the front fixing portion extends from the front longitudinal wall toward the front of the vehicle front-to-rear direction, and the front fixing portion is below the front component and the front lower panel in the vehicle up-down direction.

[0014] In an embodiment of the present invention, the front fixing portion includes a first front fixing portion and a second front fixing portion, the first front fixing portion is formed at an outer end portion in a vehicle width direction, the second front fixing portion is formed at a position away from the first front fixing portion in the vehicle width direction, and a piping component is provided between the first front fixing portion and the second front fixing portion.

[0015] In an embodiment of the present invention, a rear suspension is arranged behind the power unit housing in the front-rear direction of the vehicle and below the up-down direction of the vehicle, and the rear suspension includes a mounting portion, which is mounted on the vehicle body on opposite sides in the vehicle width direction, and the power unit housing and the mounting portion of the rear suspension overlap in the vehicle width direction.

[0016] In an embodiment of the present invention, a rear component is formed at the rear of the power unit housing in the vehicle front-rear direction, the rear component extends along the vehicle width direction, and the mounting portion of the rear suspension member and the rear fixing portion formed at the rear of the lower surface of the power unit housing are fixed to the rear component.

[0017] Based on the above, in the vehicle bottom structure of the present invention, the upper surface of the power unit housing is formed as a floor surface, so a waterproof sealing surface is required to prevent water intrusion. By providing a front sealing part and a rear sealing part of equal height at the front end and the rear end of the power unit housing, it is possible to avoid the situation where it is difficult to seal during assembly due to unequal heights in the front and rear directions. Accordingly, the vehicle bottom structure of the present invention can well prevent water intrusion.

[0018] In order to make the above features and advantages of the present invention more clearly understood, embodiments are given below with reference to the accompanying drawings for detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a top schematic diagram of a vehicle bottom structure according to an embodiment of the present invention.

[0020] Figure 2 yes Figure 1 A cross-sectional view of the vehicle bottom structure along line AA.

[0021] Figure 3 yes Figure 1 A cross-sectional view of the vehicle bottom structure along line BB.

[0022] Figure 4A yes Figure 1 A cross-sectional view of the vehicle bottom structure along the CC section line.

[0023] Figure 4B yes Figure 4A Schematic diagram of a modified embodiment of the present invention.

[0024] Figure 5 It is a partial bottom view schematic diagram of the vehicle bottom structure of this embodiment.

[0025] Figure 6 yes Figure 5 A cross-sectional view of the power unit casing along the DD section line.

[0026] Figure 7 yes Figure 5 A cross-sectional view of the power unit casing along line EE.

[0027] Figure 8 1 is another partial bottom view schematically showing the vehicle bottom structure of this embodiment.

[0028] Description of Reference Numerals

[0029] 50: rear suspension parts;

[0030] 52: Installation department;

[0031] 100: vehicle bottom structure;

[0032] 110: power unit housing;

[0033] 111: side panel;

[0034] 111a, 111a': lifting parts;

[0035] 112: first sealing surface;

[0036] 113: first storage part;

[0037] 114: second storage part;

[0038] 114a: flange portion;

[0039] 115: front fixing part;

[0040] 115a: first front fixing portion;

[0041] 115b: second front fixing portion;

[0042] 116: Front longitudinal wall;

[0043] 117: rear fixed part;

[0044] 120: side beam;

[0045] 122: bottom;

[0046] 122a: second sealing surface;

[0047] 122b: fixed surface;

[0048] 122c: longitudinal wall;

[0049] 124: reinforcement;

[0050] 130: Lower front panel;

[0051] 140: front part;

[0052] 150: rear part;

[0053] CS: closed section;

[0054] FE: fastening parts;

[0055] FS: front seal;

[0056] P: Piping parts;

[0057] RS: rear seal;

[0058] SS: side seal;

[0059] X: vehicle width direction;

[0060] Y: front and rear direction of the vehicle;

[0061] Z: The vehicle's up and down direction. DETAILED DESCRIPTION

[0062] Figure 1 It is a top schematic diagram of a vehicle bottom structure according to an embodiment of the present invention. Figure 2 yes Figure 1 A cross-sectional view of the vehicle bottom structure along line AA. Figure 3 yes Figure 1 A cross-sectional view of the vehicle bottom structure along line BB. Figure 4A yes Figure 1 A cross-sectional view of the vehicle bottom structure along the CC section line. Figure 4B yes Figure 4A Schematic diagram of a modified embodiment of the present invention. Figure 5 It is a partial bottom view schematic diagram of the vehicle bottom structure of this embodiment. Figure 6 yes Figure 5 A cross-sectional view of the power unit casing along the DD section line. Figure 7 yes Figure 5 A cross-sectional view of the power unit casing along line EE. Figure 8 It is another partial bottom view schematic diagram of the vehicle bottom structure of the present embodiment. In the present embodiment, the vehicle bottom structure 100 is, for example, a bottom structure used in an ordinary passenger car (not shown), but the present invention is not limited thereto and can also be used in other types of vehicles. The vehicle width direction X, the vehicle front-to-rear direction Y, and the vehicle up-down direction Z in the accompanying drawings are not used to limit the positional relationship of the various components in the present invention. In addition, it should be noted that, unless otherwise specified, the rear and the top used in the following specification are the directions indicated by the arrows in the vehicle front-to-rear direction Y and the vehicle up-to-down direction Z, and the front and the bottom used in the specification are the opposite directions of the aforementioned; the inside and the outside used in the specification refer to the relative position in the vehicle width direction X, and the direction indicated by the arrow in the vehicle width direction X is not used to limit the inside or the outside. Whenever possible, the same element symbols are used in the drawings and descriptions to represent the same or similar parts. The following will be matched with Figures 1 to 8 A vehicle bottom structure 100 according to the present embodiment will be described.

[0063] Please refer to Figure 1 In this embodiment, the vehicle bottom structure 100 includes a power unit housing 110. The upper surface of the power unit housing 110 is formed as a floor surface (eg, Figure 1The power unit housing 110 has a side panel 111 formed on the side of the power unit housing 110 in the vehicle width direction X. The side panel 111 protrudes from the power unit housing 110 toward the vehicle width direction X. In addition, the power unit housing 110 includes a front sealing portion FS provided at the front end portion in the vehicle front-rear direction Y, and a rear sealing portion RS provided at the rear end portion. Specifically, the front sealing portion FS and the rear sealing portion RS are provided, for example, along the edge of the power unit housing 110 to form a strip extending in the vehicle width direction X, but the present invention is not limited thereto. In addition, the front sealing portion FS and the rear sealing portion RS are provided at the same height in the vehicle up-down direction Z.

[0064] As can be seen, in the vehicle floor structure 100 of the present embodiment, the upper surface of the power unit housing 110 is formed as a floor surface, so a waterproof sealing surface is required to prevent water from entering. By providing the front sealing portion FS and the rear sealing portion RS of equal height at the front end and the rear end of the power unit housing 110, it is possible to avoid the situation where it is difficult to seal during assembly due to unequal heights in the front and rear directions. Accordingly, the vehicle floor structure 100 of the present embodiment can well prevent water from entering.

[0065] Furthermore, in the present embodiment, the power unit housing 110 further includes a side seal SS provided at the side end portion in the vehicle width direction X. The side seal SS is provided on the side panel 111, and the front seal FS, the side seal SS, and the rear seal RS are continuously connected. Specifically, the front seal FS, the side seal SS, and the rear seal RS are formed on the same plane to form a first sealing surface 112, and therefore, the side panel 111 and the first sealing surface 112 are formed in the same plane. In this way, it can be ensured that when sealing, the front seal FS, the side seal SS, and the rear seal RS of equal height can be uniformly stressed and securely sealed. Moreover, the continuous provision of the seal along the edge of the power unit housing 110 can inhibit water from entering the floor surface. In addition, in addition to mounting the power unit housing 110 on the vehicle body frame (such as the side beam 120, etc.), the side panel 111 also has a supporting function. Therefore, when a side impact occurs, the side panel 111 can inhibit the load from being directly transmitted to the power unit housing 110.

[0066] Please refer to Figure 2 , Figure 3 as well as Figure 7In this embodiment, the power unit housing 110 further includes a first storage portion 113 and a second storage portion 114. The second storage portion 114 is disposed further rearward than the first storage portion 113 in the vehicle front-rear direction Y, and the upper surface of the second storage portion 114 is formed to be higher than the upper surface of the first storage portion 113 in the vehicle up-down direction Z. Therefore, the second storage portion 114 having a larger storage space can be used to place a battery unit (not shown), but the present invention is not limited thereto. Figure 3 As shown, the second storage portion 114 includes a flange portion 114a provided on the side in the vehicle width direction X, and the flange portion 114a is set to be the same height as the first storage portion 113 in the vehicle vertical direction Z. Furthermore, the flange portion 114a is joined to the side panel 111 in the vehicle width direction X (as shown in FIG. Figure 7 Thus, the sealing surfaces of the first receiving portion 113 and the side panel 111 are at the same height, so that the sealing is more reliable.

[0067] Please refer to Figure 1 as well as Figure 4A In this embodiment, a side beam 120 is provided on the outer side of the side panel 111 in the vehicle width direction X. Figure 4A As shown, the side beam 120 is, for example, a hollow structure formed by joining a cap-shaped outer member and a cap-shaped inner member in the vehicle width direction X, and the bottom 122 of the side beam 120 in the vehicle vertical direction Z can be composed of the bottom of the outer member and the bottom of the inner member, but can also be composed of an integral member, and the present invention is not limited to this. Specifically, the bottom 122 of the side beam 120 includes a second sealing surface 122a provided at the bottom of the inner member, and a fixing surface 122b provided at the bottom of the outer member. The second sealing surface 122a is located on the inner side of the vehicle width direction X and above the vehicle vertical direction Z relative to the fixing surface 122b. In this way, it is more difficult for water on the outside of the vehicle to enter the inside from a low place to a high place, and the second sealing surface 122a and the fixing surface 122b are separately provided to improve the assembly accuracy.

[0068] Furthermore, the bottom 122 of the side beam 120 further includes a longitudinal wall 122c. The longitudinal wall 122c extends along the vehicle vertical direction Z to connect the second sealing surface 122a and the fixing surface 122b. A reinforcement member 124 extending along the vehicle vertical direction Z is provided inside the side beam 120, and the longitudinal wall 122c is connected to the lower end of the reinforcement member 124. That is, from the perspective of the vehicle front-to-back direction (i.e. Figure 4A ), the longitudinal wall 122c and the reinforcement member 124 are connected in a straight line to strengthen the cross-sectional strength of the side beam 120, and can also avoid affecting the second sealing surface 122a and the fixing surface 122b.

[0069] Next, the side panel 111 forms a hollow closed section CS below the side beam 120 in the vehicle vertical direction Z. For example, the outer end of the side panel 111 in the vehicle width direction X is composed of an upper frame and a lower frame, thereby enclosing the closed section CS, but the closed section CS can also be formed integrally, and the present invention is not limited to this. In addition, a lifting component 111a is provided inside the closed section CS. Compared with the lifting component 111a provided in the side beam 120, the closed section CS provided in the side panel 111 can suppress the height in the vehicle vertical direction Z, and thus can suppress the bending of the lifting component 111a. In addition, the fixing surface 122b of the side beam 120 is fixed to the side panel 111 by the fastening component FE, and the lifting component 111a is provided close to the fastening component FE. As a result, the load during lifting can be borne by the fastening component FE and the side beam 120. The fastening component FE is, for example, a combination of a bolt and a sleeve, but may also be other appropriate fastening tools, and the present invention is not limited thereto.

[0070] like Figure 4A As shown in FIG. 1 , the lifting member 111 a is provided, for example, on the inner side of the fastening member FE in the vehicle width direction X. Figure 4B As shown, in a modified embodiment, the lifting component 111a' may also be arranged on the outer side of the fastening component FE in the vehicle width direction X, but the present invention is not limited thereto.

[0071] Please refer to Figure 1 , Figure 5 as well as Figure 8 The following is a description of the back side of the vehicle bottom structure 100. The power unit housing 110 is, for example, a housing of an intelligent power unit (IPU) to protect the intelligent power unit located therein. In addition, the power unit housing 110 is assembled below the vehicle body frame (partially shown), wherein the vehicle body frame is, for example, composed of a side beam 120, a front panel (such as Figure 1 The lower front panel 130 shown in the figure is, for example, made of a high-strength material such as a heat-treated material, and the rear component 150 (such as Figure 8 ). For example, the power unit housing 110 is mounted on the floor cross member, and then mounted on the side beam 120 by a connecting member (such as a side panel 111), and the vehicle body frame and the power unit housing 110 are sealed (front sealing part FS, side sealing part SS, and rear sealing part RS, etc.) to prevent water from intruding. In addition, the power unit housing 110 and the vehicle body frame are connected by screws or bolts, for example, but the present invention is not limited thereto.

[0072] Please refer to Figure 5In this embodiment, the vehicle bottom structure 100 further includes a lower dash panel 130 and a front component 140. The lower dash panel 130 is disposed in front of the power unit housing 110 in the vehicle front-rear direction Y, and the front component 140 is disposed below the lower dash panel 130 in the vehicle up-down direction Z. A front fixing portion 115 is disposed near the front sealing portion FS of the power unit housing 110. The front fixing portion 115 may be provided in multiple numbers or in a single number, and the present invention is not limited thereto. The front fixing portion 115 integrally fixes the power unit housing 110, the lower dash panel 130, and the front component 140. In this way, the bonding strength of the power unit housing 110 can be improved by the lower dash panel 130 having a higher rigidity, and the integral fixing can ensure that the sealing portion (front sealing portion FS) is pressed against the dash panel to avoid peeling.

[0073] Please refer to Figure 6 , further illustrating the fixing structure. The power unit housing 110 also includes a front longitudinal wall 116, and the front longitudinal wall 116 extends from the front of the front sealing portion FS in the vehicle front-rear direction Y toward the bottom of the vehicle up-down direction Z. The front fixing portion 115 extends from the front longitudinal wall 116 toward the front of the vehicle front-rear direction Y, and the front fixing portion 115 is located below the front component 140 and the front lower panel 130 in the vehicle up-down direction Z, and is fixed along the vehicle up-down direction Z with a combination of bolts and sleeves, but the present invention is not limited to this. In other words, the front lower panel 130, the front component 140, and the front fixing portion 115 are fixed in this order from top to bottom in the vehicle up-down direction Z. In this way, the front component 140 can be more firmly installed in the power unit housing 110.

[0074] Please refer to Figure 5 as well as Figure 7 In the present embodiment, the front fixing portion 115 includes a first front fixing portion 115a and a second front fixing portion 115b. The first front fixing portion 115a and the second front fixing portion 115b have the same function and fixing method, and the difference is only in the setting position. Specifically, the first front fixing portion 115a is formed at the outer end portion in the vehicle width direction X, and the second front fixing portion 115b is formed at a position away from the first front fixing portion 115a in the vehicle width direction X, that is, a position set on the inner side compared to the first front fixing portion 115a. Since the first front fixing portion 115a and the second front fixing portion 115b are far away from each other, the number of fixing portions can be suppressed, and a piping component P can be further provided between the first front fixing portion 115a and the second front fixing portion 115b. In detail, the piping component P extends approximately along the vehicle front-rear direction Y, and is provided below the side panel 111 in the vehicle up-down direction Z (such as Figure 7), and pass through between the first front fixing portion 115a and the second front fixing portion 115b. The piping components P include wiring harnesses, brake piping, three-phase wires, etc., but not all wires pass through between the first front fixing portion 115a and the second front fixing portion 115b. Some wires pass through between the second front fixing portion 115b (close to the center side in the vehicle width direction X), and the present invention is not limited to this.

[0075] Please refer to Figure 8 In this embodiment, a rear suspension member 50 is provided behind the power unit housing 110 in the vehicle front-rear direction Y and below the vehicle up-down direction Z. The rear suspension member 50 includes a mounting portion 52, which is mounted on a vehicle body (not shown) at opposite sides in the vehicle width direction X to fix the rear suspension member 50. The power unit housing 110 overlaps with the mounting portion 52 of the rear suspension member 50 in the vehicle width direction X. That is, the width of the power unit housing 110 extends to the vicinity of the rear suspension member 50, thereby ensuring a capacity space for placing the battery unit.

[0076] Furthermore, a rear member 150 is formed at the rear of the power unit housing 110 in the vehicle front-rear direction Y. The rear member 150 extends along the vehicle width direction X, and the mounting portion 52 of the rear suspension member 50 and the rear fixing portion 117 formed at the rear of the lower surface of the power unit housing 110 are fixed to the rear member 150. In this way, the power unit housing 110 is fixed to the rear member 150 to which the rear suspension member 50 is fixed, and the supporting rigidity of the power unit housing 110 can be further improved. The rear fixing portion 117 is, for example, provided in plurality, but may also be provided in a single portion, and the present invention is not limited thereto.

[0077] In summary, in the vehicle bottom structure of the present invention, the upper surface of the power unit housing is formed as a floor surface, so a waterproof sealing surface is required to prevent water intrusion. By providing a front sealing portion and a rear sealing portion of equal height at the front end and the rear end of the power unit housing, a more reliable sealing can be formed. In addition, a side panel is formed on the side of the power unit housing, and the sealing portion is continuously provided along the edge of the power unit housing and the side panel. In this way, in addition to ensuring that water does not intrude, the side panel can mount the power unit housing on the vehicle body frame (such as a side beam, etc.) and provide support. Accordingly, the vehicle bottom structure of the present invention can prevent water intrusion.

[0078] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A vehicle bottom structure, comprising a power unit housing, characterized in that: The upper surface of the power unit housing is formed as a floor surface, and The power unit housing includes a front sealing portion disposed at the front end portion and a rear sealing portion disposed at the rear end portion, wherein The front sealing portion and the rear sealing portion are arranged at the same height in the vehicle vertical direction.

2. The vehicle bottom structure according to claim 1, characterized in that: The power unit housing further includes a side sealing portion disposed at a side end portion. The front seal portion, the side seal portion, and the rear seal portion are continuously connected and formed on the same plane to form a first seal surface.

3. The vehicle bottom structure according to claim 2, characterized in that: A side panel is formed on the side of the power unit housing, and the side panel and the first sealing surface form a same plane. The side seal portion is provided on the side panel.

4. The vehicle bottom structure according to claim 3, characterized in that: The power unit housing further includes a first storage portion and a second storage portion, wherein the second storage portion is disposed further rearward than the first storage portion in the front-rear direction of the vehicle, and an upper surface of the second storage portion is formed to be higher than an upper surface of the first storage portion in the upper-lower direction of the vehicle, The second storage portion includes a flange portion, and the flange portion and the first storage portion are arranged at the same height in the vertical direction of the vehicle, and The flange portion is joined to the side panel.

5. The vehicle bottom structure according to claim 3, characterized in that: A side beam is provided on the outer side of the side panel in the vehicle width direction. The side beam includes a second sealing surface and a fixing surface at a bottom portion in the vehicle vertical direction. The second sealing surface is located inside the vehicle width direction and above the vehicle vertical direction relative to the fixing surface.

6. The vehicle bottom structure according to claim 5, characterized in that: The bottom of the side beam further includes a longitudinal wall, which extends along the vertical direction of the vehicle to connect the second sealing surface and the fixing surface, and A reinforcement is provided inside the side beam, and the longitudinal wall is connected to a lower end portion of the reinforcement.

7. The vehicle bottom structure according to claim 5, characterized in that: The side panel is formed with a hollow closed cross section below the side beam in the vehicle vertical direction. A lifting component is arranged inside the closed cross section.

8. The vehicle bottom structure according to claim 7, characterized in that: The fixing surface of the side beam is fixed to the side panel by a fastening member, The lifting member is disposed close to the fastening member.

9. The vehicle bottom structure according to claim 2, characterized in that: Also includes: A lower front panel, arranged in front of the power unit housing in the front-rear direction of the vehicle; as well as A front component is arranged below the lower front panel in the vehicle up-down direction, wherein The power unit housing is provided with a front fixing portion at a position close to the front sealing portion, and the front fixing portion integrally fixes the power unit housing, the lower dash panel, and the front member.

10. The vehicle bottom structure according to claim 9, characterized in that: The power unit housing further includes a front longitudinal wall extending from the front of the front sealing portion in the vehicle front-rear direction toward the bottom of the vehicle up-down direction, and the front fixing portion extends from the front longitudinal wall toward the front of the vehicle front-rear direction. The front fixing portion is located below the front member and the lower dash panel in the vehicle up-down direction.

11. The vehicle bottom structure according to claim 9, characterized in that: The front fixing portion includes a first front fixing portion and a second front fixing portion, The first front fixing portion is formed at an outer end portion in the vehicle width direction, and the second front fixing portion is formed at a position away from the first front fixing portion in the vehicle width direction. A pipe member is provided between the first front fixing portion and the second front fixing portion.

12. The vehicle bottom structure according to claim 2, characterized in that: A rear suspension member is provided at the rear of the power unit housing in the front-rear direction of the vehicle and at the bottom of the vehicle in the up-down direction. The rear suspension member includes a mounting portion, which is mounted on the vehicle body at two opposite sides in the vehicle width direction. The power unit case and the mounting portion of the rear suspension overlap in the vehicle width direction.

13. The vehicle bottom structure according to claim 12, characterized in that: A rear member is formed at the rear of the power unit housing in the vehicle front-rear direction, and the rear member extends in the vehicle width direction. The mounting portion of the rear suspension and a rear fixing portion formed at the rear of the lower surface of the power unit case are fixed to the rear member.

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