WO2017154843A1

WO2017154843A1 - Cab rear surface section structure

Info

Publication number: WO2017154843A1
Application number: PCT/JP2017/008814
Authority: WO
Inventors: 皓平馬場
Original assignee: いすゞ自動車株式会社
Priority date: 2016-03-07
Filing date: 2017-03-06
Publication date: 2017-09-14
Also published as: CN108778908B; CN108778908A; JP6688480B2; JP2017159707A

Abstract

A back panel 12 of a cab 10 has left and right beads 17. The beads 17 extend along a vertical direction throughout an up-down dimension of the back panel 12, while protruding toward a rear side. Left and right reinforcements 13 of the cab 10 each have left and right anchoring surface sections 13a, 13b, left and right sloped surface sections 13c, 13d, and a front surface section 13e, and are positioned in locations that face the left and right beads 17 from the front. The left and right anchoring surface sections 13a, 13b are joined to regions of a front surface 21 of the back panel 12, said regions being located at the left and right sides of each bead 17. The left and right sloped surface sections 13c, 13d and the front surface section 13e protrude toward the front side, between the left and right anchoring surface sections 13a, 13b. Closed spaces 22 between the reinforcements 13 and the back panel 12 extend in the up-down direction throughout approximately the entire up-down directional area of the back panel 12.

Description

Rear structure of cab

This disclosure relates to the structure of the rear surface of the vehicle cab.

Patent Document 1 describes a cab of a cab over type vehicle. A lean reinforcement is provided inside the back panel constituting the cab. The lower end of the lean reinforcement is fixed to the lower end of the back panel by spot welding or the like, protrudes inward of the back panel and extends upward, and the upper end of the lean reinforcement extends in the left-right direction of the back panel. It is fixed by spot welding. The back member protrudes inward of the cab at the lower position of the rear window on the back panel and extends in the left-right direction. In the portion of the back panel where the reinforcement is installed, a reinforcing bead is formed by projecting the back panel to the outside of the cab and extending in the vertical direction. This publication shows a state in which the bead protrudes rearward at an intermediate portion between the lower end of the rear window and the lower end of the back panel.

Japanese Unexamined Patent Publication No. 2002-53079

In the back panel of the cab described in Patent Document 1, a lean reinforcement is provided below the back member extending in the vehicle width direction below the rear window. However, the bead of the back panel below the back member protrudes backward in a part of the back panel (an intermediate portion between the lower end of the rear window and the lower end of the back panel). It is difficult to sufficiently secure the strength of the back panel against the load input from above (or below) in the region below the back member. In addition, since a lean reinforcement or the like is not provided on the back panel above the back member, it is difficult to sufficiently ensure the strength of the back panel above the back member.

Therefore, an object of the present disclosure is to provide a rear surface structure of a cab that can sufficiently ensure strength against a load input from above and below.

In order to solve the above problem, a first aspect of the present disclosure is a rear surface structure of a cab supported from below by a vehicle body frame, and includes a back panel and a reinforcement. The back panel has a bead extending in the up-down direction in a state of protruding to one side in the front-rear direction, and stands up crossing the front-rear direction at the rear end of the cab. Reinforce protrudes to the other side between the left and right fixed surface portions of the other side surface of the back panel in the front-rear direction and the left and right fixed surface portions, and projects to the other side between the left and right fixed surface portions. And a projecting portion facing each other, extending in the vertical direction, and defining a closed space with the bead of the back panel. The closed space extends over substantially the entire vertical direction of the back panel.

In the above configuration, the bead of the back panel protrudes on one side in the front-rear direction, and the protrusion of the reinforcement protrudes on the other side in the front-rear direction. A large cross-sectional area of the closed space between the bead and the reinforcement of the panel can be secured. For this reason, the intensity | strength of the back panel with respect to the load of the up-down direction input into a cab is fully securable.

In addition, since the closed space between the bead and the reinforcement of the back panel extends over substantially the entire area in the vertical direction of the back panel, sufficient strength of the back panel against the vertical load input to the cab should be ensured. Can do.

Therefore, it is possible to sufficiently secure the strength of the rear surface portion of the cab with respect to the load input from above and below.

The second aspect of the present disclosure is the rear surface structure of the cab according to the first aspect, and includes a rear mount rail. The rear mount rail has a supported surface portion that is supported by the vehicle body frame from below, extends in the vehicle width direction at the lower rear end of the cab, and is joined to the lower edge of the back panel. The rear mount rail has a supported region including a supported surface portion within a predetermined range in the vehicle width direction. The lower end of one of the bead and the reinforcement of the back panel is fixed to the supported region of the rear mount rail.

In the above configuration, the supported surface portion of the rear mount rail is supported from below by the vehicle body frame, and the lower end portion of one of the bead and the reinforcement of the back panel is fixed to the supported region of the rear mount rail. . For this reason, the load from above input to the cab is transmitted from the beads and the reinforcement to the vehicle body frame side via the supported region of the rear mount rail, and the load from below input to the cab is transmitted to the rear mount rail. It is transmitted to the bead and reinforcement side via the support area. In this way, the load from the upper side (bead and reinforcement side) and the load from the lower side (vehicle body frame side) are efficiently transmitted in the vertical direction via the supported area of the rear mount rail, so the rear surface of the cab Therefore, the strength of the rear surface of the cab against the load in the vertical direction input to the cab can be ensured.

In addition, since the load from above and the load from below are input to the same area (supported area) in the vehicle width direction of the rear mount rail, the rear mount rail can be prevented from being bent and deformed, and the rear surface of the cab The strength of the can be ensured.

In the third aspect of the present disclosure, the protruding portion may have a left and right inclined surface portion and a front surface portion.

In the fourth aspect of the present disclosure, the bead may have left and right inclined surface portions and a rear surface portion.

In the fifth aspect of the present disclosure, the reinforcement may be arranged on the front side in the front-rear direction with respect to the bead.

According to the present disclosure, it is possible to sufficiently ensure the strength of the rear surface portion of the cab with respect to a load input from the up and down direction.

1 is an external perspective view of a vehicle according to an embodiment. It is the schematic of the rear surface part of a cab. It is a perspective view of the rear surface part of a cab. FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. 3. It is an exploded view of the rear surface part of a cab. FIG. 6 is a cross-sectional view taken along the line VI-VI in FIG. 3.

Hereinafter, an embodiment of the present disclosure will be described based on the drawings. In each figure, FR indicates the front of the vehicle, UP indicates the upper side, and IN indicates the inner side in the vehicle width direction. Moreover, in the following description, the left-right direction means the left-right direction with the vehicle facing forward.

As shown in FIG. 1, the rear surface structure of the cab according to the present embodiment is applied to the cab 10 of a cab-over type truck 1 in which the cab 10 is generally disposed above an engine (not shown).

As shown in FIG. 2, the truck 1 has a pair of left and right side members 2 extending across the front and rear of the vehicle, and a plurality of cross members 3 extending in the vehicle width direction and connecting the left and right side members 2 to each other. . The left and right side members 2 and the plurality of cross members 3 constitute a vehicle body frame 4 of the truck 1. The lower portion of the front end of the cab 10 is rotatably supported by the front end portion of the vehicle body frame 4 via a front cab mount (not shown). The rear end of the cab 10 is supported from below by the vehicle body frame 4 via a rear cab mount 5 fixed to the left and right side members 2. The rear cab mount 5 has a cushion rubber (not shown) on its upper surface, and elastically supports a rear cab mount bracket 6 described later via the cushion rubber from below. In FIG. 2, only one cross member 3 is shown.

As shown in FIGS. 2 to 4, the cab 10 includes a rear cab mount rail (rear mount rail) 11, a back panel 12, and a pair of left and right reinforcements 13. It is arranged above the part and supported by the body frame 4 from below. The rear cab mount rail 11, the back panel 12, and the left and right reinforcements 13 constitute a rear surface portion 7 (hereinafter referred to as a cab rear surface portion 7) that defines the rear of the cab 10. In FIG. 4, only the left-side reinforcement 13 is shown.

As shown in FIGS. 2 to 5, the rear cab mount rail 11 is a part of the floor panel 14 that defines the lower part of the cab 10, and is bent so that the rear end side of the floor panel 14 protrudes upward. The rear end of the cab 10 extends in the vehicle width direction, and the rigidity of the rear end edge of the floor panel 14 is ensured. The rear cab mount rail 11 includes a front plate portion 11a standing at the rear end portion of the floor panel 14, an upper plate portion 11b that bends from the upper edge of the front plate portion 11a and extends rearward, and a rear end of the upper plate portion 11b. The rear plate portion 11c is bent from the edge 27 and extends downward, is formed in an open cross-sectional shape that opens downward, and defines the space 8 inside thereof. The upper plate portion 11 b of the rear cab mount rail 11 has a pair of left and right mount bracket fixing portions (supported surface portions) 15. A pair of left and right rear cab mount brackets 6 are arranged below the left and right mount bracket fixing portions 15 and fixed to the left and right mount bracket fixing portions 15. The rear cab mount rail 11 has a pair of left and right supported regions 25 that are regions including the mount bracket fixing portion 15 within a predetermined range in the vehicle width direction. The left and right supported regions 25 are regions in which the support force from the rear cab mount 5 is relatively stronger than other regions, and each includes a mount bracket fixing portion 15, a front region 26, and a rear region (not shown). Have. The front region 26 of the supported region 25 is a region extending downward from the front edge of the mount bracket fixing portion 15 in the front plate portion 11 a of the rear cab mount rail 11. The rear region of the supported region 25 is a region that extends downward from the rear edge of the mount bracket fixing portion 15 in the rear plate portion 11c of the rear cab mount rail 11. The length in the vehicle width direction of the front region 26 and the rear region of the supported region 25 is substantially the same as the length of the mount bracket fixing portion 15 in the vehicle width direction. That is, the length of the predetermined range, which is the length of the supported region 25 in the vehicle width direction, is substantially the same as the length of the mount bracket fixing portion 15 in the vehicle width direction.

As shown in FIGS. 2, 3 and 5, the left and right rear cab mount brackets 6 are formed of a plate body in a frame shape penetrating in the front-rear direction, and a locking device (which can lock the rear cab mount 5 inside thereof) (Not shown). The left and right rear cab mount brackets 6 are an upper plate portion 6a that is fixed to the mount bracket fixing portion 15 of the rear cab mount rail 11 in surface contact from below, and a lower plate portion that is supported by the rear cab mount 5 from below. 6b, and is disposed in the space 8 below the rear cab mount rail 11. That is, the left and right mount bracket fixing portions 15 of the rear cab mount rail 11 are supported from below by the vehicle body frame 4 via the left and right rear cab mount brackets 6 and the rear cab mount 5, and the cab rear surface portion 7 is attached to the vehicle body frame 4. Supported from below.

The left and right mount bracket fixing portions 15 of the rear cab mount rail 11 are configured such that, of the upper plate portion 11b of the rear cab mount rail 11, the upper plate portion 6a of the rear cab mount bracket 6 comes into surface contact from below and the rear cab mount bracket 11 6, the length of the mount bracket fixing portion 15 in the vehicle width direction is substantially the same as the length of the upper plate portion 6 a of the rear cab mount bracket 6 in the vehicle width direction. Are the same. In the present invention, “substantially the same” is a concept including not only completely the same but also a slightly different state due to an error in manufacturing.

As shown in FIGS. 5 and 6, the back panel 12 is a plate that partitions the rear of the cab 10, has a pair of left and right beads 17 extending in the vertical direction, and extends along the rear cab mount rail 11. Stand up at the rear end of the cab 10. The back panel 12 is formed to be curved so that the center portion in the vehicle width direction protrudes rearward from both end portions in the vehicle width direction. The lower end edge portion of the back panel 12 is disposed behind the rear plate portion 11c of the rear cab mount rail 11 and joined to the rear plate portion 11c. A roof back rail 16 (see FIG. 4) extending in the vehicle width direction is fixed to an upper end edge of the back panel 12 on the front surface 21 side so as to protrude forward, and a closed cross section is defined between the back panel 12 and the back panel 12. The upper edge of the back panel 12 is reinforced. The rear edge of the roof panel 18 (see FIGS. 3 and 4) that defines the upper side of the cab 10 is fixed to the upper edge of the back panel 12. Both end edges of the back panel 12 in the vehicle width direction are fixed to the rear edge of the outer panel 19 and the rear edge of the inner panel 20 on both sides of the cab 10 in the vehicle width direction. Both end edges in the vehicle width direction of the back panel 12, the rear edge edge of the outer panel 19, and the rear edge edge of the inner panel 20 protrude rearward of the cab 10 and extend in the vertical direction, and overlap each other in the vehicle width direction. Are joined together.

The left and right beads 17 extend along the vertical direction over the top and bottom of the back panel 12 while projecting toward one side in the front-rear direction (in this embodiment, the rear side). Are provided symmetrically to the left and right to reinforce the back panel 12. Each bead 17 has left and right

inclined surface portions

17a and 17b and a rear surface portion 17 (planar portion) c, and is disposed at substantially the same position in the vehicle width direction as the left and right supported regions 25 of the rear cab mount rail 11. The Specifically, the center line in the vehicle width direction of the bead 17 is substantially the same position in the vehicle width direction as the center line in the vehicle width direction of the mounting bracket fixing portion 15 of the rear cab mount rail 11 (two-dot chain line in FIG. 2). 9). The left and right

inclined surface portions

17a and 17b of the bead 17 extend in an inclined manner in a direction in which they are adjacent to each other on the rear side. The rear surface portion 17c of the bead 17 crosses the front and rear direction and connects the rear end edges of the left and right

inclined surface portions

17a and 17b.

The left and right reinforcements 13 are each formed in a cross-sectional hat shape having left and right fixed

surface portions

13a and 13b, left and right

inclined surface portions

13c and 13d, and a front surface portion (planar portion) 13e. The left and right

inclined surface portions

13c and 13d and the front surface portion (planar portion) 13e form a projection portion of the reinforcement. The left and right reinforcements 13 are arranged at positions facing the left and right beads 17 from the front of the other side surface 21 (front surface 21 in the present embodiment) of the back panel 12 in the front-rear direction. It is fixed to 21 and extends in the vertical direction. That is, as with the left and right reinforcements 13, as in the case of the left and right beads 17 of the back panel 12, the center line in the vehicle width direction is the same as the center line in the vehicle width direction of the mounting bracket fixing portion 15 of the rear cab mount rail 11. By being disposed at substantially the same position in the width direction (position indicated by a two-dot chain line 9 in FIG. 2), the left and right supported regions 25 of the rear cab mount rail 11 as a whole are located at substantially the same position in the vehicle width direction. Be placed. The upper ends of the left and right reinforcements 13 are arranged at the upper end edge of the back panel 12. The roof back rail 16 (see FIG. 4) is fixed to the back panel 12 so as to cover the upper ends of the left and right reinforcements 13 from the front. The lower ends of the left and right reinforcements 13 are close to the upper surface of the mounting bracket fixing portion 15 of the rear cab mounting rail 11. The left and right fixed

surface portions

13 a and 13 b are joined to regions located on the left and right sides of the bead 17 in the front surface 21 of the back panel 12. The left and right

inclined surface portions

13c, 13d extend from the edge portions on the bead 17 side of the left and right fixed

surface portions

13a, 13b in a direction close to each other in the front. The front surface portion 13e crosses the front and rear direction facing the rear surface portion 17c at a position spaced forward from the rear surface portion 17c of the bead 17, and connects the front end edges of the left and right

inclined surface portions

13c and 13d. That is, the left and right

inclined surface portions

13c and 13d and the front surface portion 13e protrude between the left and right fixed

surface portions

13a and 13b on the other side in the front-rear direction (the front side in the present embodiment). The front portion 13e of the reinforcement 13 is disposed at substantially the same position in the front-rear direction as the rear end edge of the mount bracket fixing portion 15 in the rear end edge 27 of the upper plate portion 11b of the rear cab mount rail 11. An L-shaped bracket 23 to be described later is fixed to the lower end portion 28 of the front surface portion 13e of the reinforcement 13. In a state where the left and right reinforcements 13 are fixed to the back panel 12, the back panel 12 is reinforced by partitioning a closed space 22 having a substantially hexagonal cross section between the bead 17 of the back panel 12. A closed space 22 between the reinforcement 13 and the back panel 12 extends in the vertical direction over substantially the entire area of the back panel 12 in the vertical direction. In the present disclosure, the closed space 22 extends over substantially the entire area of the back panel 12 in the vertical direction, not only in a state in which the closed space 22 continuously extends from the upper end edge to the lower end edge of the back panel 12 but also in the back It is a concept that includes a state that extends over the entire region in the vertical direction of the intermediate portion excluding the lower end edge joined to the rear cab mount rail 11 and the upper end edge joined to the roof back rail 16 of the panel 12. Further, the closed space in the above embodiment is not limited to a completely closed space, and openings may be formed at the upper end and the lower end of the bead 17 and the reinforcement 13, and members are provided in the bead 17 and the reinforcement 13. A hole or the like for fixing or mounting may be formed.

As shown in FIGS. 4 and 5, the bracket 23 integrally includes a vertical plate portion 23 a extending in the vertical direction in a side view of the vehicle and a front plate portion 23 b bent from the lower end of the vertical plate portion 23 a and extending forward. Have. The upper end portion of the vertical plate portion 23 a is fixed to the front surface 24 of the front surface portion 13 e of the reinforcement 13, and the lower end of the vertical plate portion 23 a is in contact with the upper surface of the mount bracket fixing portion 15. The front plate portion 23b extends along the upper surface of the mount bracket fixing portion 15, and is fixed to the mount bracket fixing portion 15 by welding or the like. That is, the lower end portion 28 of the reinforcement 13 is fixed to the mount bracket fixing portion 15 of the supported region 25 of the rear cab mount rail 11 via the bracket 23. Note that the shape of the bracket 23 is not limited to a substantially L-shape, and the other end is fixed to the lower end portion 28 of the reinforcement 13 and the other end is fixed to the supported region 25 of the rear cab mount rail 11. The shape may also be

In the cab 10 configured as described above, the left and right beads 17 of the back panel 12 protrude to the rear side, and the left and right

inclined surface portions

13c and 13d and the front surface portion 13e of the reinforcement 13 protrude to the front side. Compared with the case where one of 12 or the reinforcement 13 is flat, a large cross-sectional area of the closed space 22 between the bead 17 and the reinforcement 13 of the back panel 12 can be secured. For this reason, it is possible to sufficiently ensure the strength of the back panel 12 against the load in the vertical direction inputted to the cab 10.

Further, since the closed space 22 between the bead 17 and the reinforcement 13 of the back panel 12 extends over substantially the entire area of the back panel 12 in the vertical direction, the back panel 12 is subjected to the vertical load input to the cab 10. Sufficient strength can be secured.

Therefore, it is possible to sufficiently secure the strength of the cab rear surface portion 7 with respect to the load input from the vertical direction.

Further, the mounting bracket fixing portion 15 of the rear cab mounting rail 11 is supported from below by the vehicle body frame 4, and the lower end portion 28 of the reinforcement 13 is supported with respect to the supported region 25 of the rear cab mounting rail 11 via the bracket 23. Fixed. For this reason, the load from above input to the cab 10 is transmitted from the bead 17 and the reinforcement 13 to the vehicle body frame 4 side via the supported region 25 of the rear cab mount rail 11, and the load from below the cab 10 is Then, it is transmitted to the bead 17 and the reinforcement 13 side through the supported region 25 of the rear cab mount rail 11. As described above, the load from above (bead 17 and reinforcement 13 side) and the load from below (vehicle body frame 4 side) are efficiently transmitted in the vertical direction via the supported region 25 of the rear cab mount rail 11. Therefore, stress concentration on a predetermined portion of the cab rear surface portion 7 can be prevented, and the strength of the cab rear surface portion 7 against the load in the vertical direction inputted to the cab 10 can be ensured.

In addition, since the load from above and the load from below are input to the same region (supported region 25) in the vehicle width direction of the rear cab mount rail 11, bending deformation of the rear cab mount rail 11 can be prevented. The strength of the cab rear surface portion 7 can be ensured.

In the present embodiment, the rear cab mount rail 11 formed by bending the rear end side of the floor panel 14 so as to protrude upward is provided, but the present invention is not limited to this, and the rear end of the cab 10 is not limited thereto. Any other configuration may be used as long as it is a rear cab mount rail that extends in the vehicle width direction at the bottom and is supported by the vehicle body frame 4 from below. For example, the rear cab mount rail may be a cylindrical body such as a rectangular section that is fixed to the rear edge of the floor panel 14 and extends in the vehicle width direction.

In the present embodiment, the rear cab mount bracket 6 is fixed to the mount bracket fixing portion 15 of the rear cab mount rail 11, so that the mount bracket fixing portion 15 is lowered to the rear cab mount 5 via the rear cab mount bracket 6. The mount bracket fixing portion 15 functions as a supported surface portion, but is not limited to this. For example, a predetermined area of the rear cab mount rail 11 may be directly supported from below by a cushion rubber of the rear cab mount 5, and the predetermined area may function as a supported surface portion. In this case, the portion of the rear cab mount rail 11 that is in contact with the cushion rubber of the rear cab mount 5 is the supported surface portion, and the length of the predetermined region in the vehicle width direction includes the supported surface portion. Is the length in the vehicle width direction.

In the present embodiment, the front plate portion 23b of the bracket 23 is fixed to the mount bracket fixing portion 15 of the rear cab mount rail 11. However, the present invention is not limited to this. For example, other portions of the supported region 25 It may be fixed to the front region 26 or the rear region.

In the present embodiment, the lower end portion 28 of the reinforcement 13 is fixed to the supported region 25 of the rear cab mount rail 11 via the bracket 23, but the rear cab mount rail 11 is not provided without the bracket 23. It may be fixed directly to the supported region 25 by welding or the like.

The cross-sectional shape of the closed space 22 defined between the bead 17 and the reinforcement 13 of the back panel 12 is not limited to a hexagonal shape, and may be, for example, a rectangular shape or a circular shape. .

As mentioned above, although this invention was demonstrated based on the said embodiment, this invention is not limited to the content of the said embodiment, Of course, it can change suitably in the range which does not deviate from this invention. That is, it is needless to say that other embodiments, examples, operation techniques, and the like made by those skilled in the art based on this embodiment are all included in the scope of the present invention.

For example, in the above-described embodiment, the bead 17 of the back panel 12 protrudes backward, and the reinforcement 13 protrudes forward, but the bead 17 of the back panel 12 extends forward (one side in the front-rear direction). While projecting, the reinforcement 13 may be projected rearward (the other side in the front-rear direction). In this case, the lower end portion of the bead 17 of the back panel 12 may be fixed to the supported region 25 of the rear cab mount rail 11.

In the above embodiment, the rear surface structure of the cab according to the present invention is applied to the cab 10 of a normal roof height truck 1, but is not limited to this, and the cab of a high roof type truck, The present invention may be applied to a cab such as a tractor that pulls a trailer.

This application is based on a Japanese patent application (Japanese Patent Application No. 2016-043753) filed on March 7, 2016, the contents of which are incorporated herein by reference.

The present disclosure is useful in that the strength of the rear surface portion of the cab with respect to a load input from above and below can be sufficiently secured.

1: Truck 4: Body frame 7: Rear portion of cab 10: Cab 11: Rear cab mount rail (rear mount rail)
12: Back panel 13: Reinforce 13a, 13b: Reinforce left and right fixed

surface

13c, 13d: Reinforce left and right inclined surface (projection)
13e: Reinforce front (projection)
15: Mount bracket fixing part (supported surface part)
17: Bead 21: Front face of back panel 22: Closed space 25: Supported area of rear cab mount rail 28: Lower end of reinforcement

Claims

The rear surface structure of the cab supported from below by the body frame,
A back panel that has a bead extending in the up-down direction in a state of protruding to one side in the front-rear direction, and stands up crossing the front-rear direction of the body frame at the rear end of the cab;
The left and right fixed surface portions fixed to the left and right side regions of the bead on the other side surface in the front-rear direction of the back panel, and the other side projecting to the other side between the left and right fixed surface portions And a protrusion that extends in the vertical direction and defines a closed space with the bead of the back panel.
The rear surface structure of the cab, wherein the closed space extends over substantially the entire vertical direction of the back panel.
The cab rear surface structure according to claim 1,
The vehicle body frame includes a supported surface portion supported from below, and includes a rear mount rail that extends in the vehicle width direction at the lower rear end of the cab and is joined to the lower edge of the back panel.
The rear mount rail has a supported region including the supported surface portion within a predetermined range in the vehicle width direction,
The rear surface structure of the cab, wherein a lower end portion of one of the bead and the reinforcement of the back panel is fixed to the supported region of the rear mount rail.
The rear surface structure of the cab according to claim 1 or 2,
The protruding portion has a left and right inclined surface portion and a front surface portion.
The cab rear surface structure according to any one of claims 1 to 3,
The bead has a left and right inclined surface portion and a rear surface portion.
The rear surface structure of the cab according to claim 1,
The rear surface structure is characterized in that the reinforcement is disposed on the front side in the front-rear direction with respect to the bead.