Connection structure between the cabin part and the rear body part

Abstract

To efficiently reduce deformation of a cabin portion in a connection structure of the cabin portion and a rear body portion, in which the inside of the cabin portion and the inside of the rear body portion communicate with each other.SOLUTION: A connection structure 1 of a cabin portion 2 and a rear body portion 3 includes: the cabin portion 2 having a cabin opening 5 that is open in a rear end thereof; and the rear body portion 3 having a rear body opening 11 that is open in a front end thereof and allowing communication between the inside of the cabin portion 2 and the inside of the rear body portion via the cabin opening 5 and the rear body opening 11, wherein since the cabin opening 5 and the rear body opening 11 are fixed and connected to each other so as to prevent a relative positional relation from being changed in any direction with respect to external force, deformation of the cabin portion 2 can be efficiently reduced in the connection structure 1 of the cabin portion 2 and the rear body portion 3 in which the inside of the cabin portion 2 and the inside of the rear body portion 3 communicate with each other by sharing a force deforming the cabin portion 2 with the rear body portion 3.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a connection structure between a cabin part and a rear body part.

Background Art

[0002] In a truck or the like, a connection structure (walk-through) is known in which the interior of a cabin part having a driver's seat and a passenger seat communicates with the interior of a rear body part having a cargo compartment. For example, Patent Document 1 discloses a structure in which a cabin part and a rear body part are connected by a connecting part that is a plate-like member in a bent state, and the connecting part covers a passage between the cabin part and the rear body part.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in a structure in which the interior of the cabin part and the interior of the rear body part communicate with each other as described above, when the cabin part and the rear body part are integrally manufactured, a large amount of investment and dedicated design are required. Therefore, a structure in which an existing cabin part is partially used and the rear body part is separately manufactured as a box-shaped highly versatile one is adopted in the case of small-lot production.

[0005] In the structure as described above, there is no back panel portion which is the wall surface at the rear end of the cabin portion. Also, in the structure as described above, in order to improve the convenience of passage and aerodynamic performance between the cabin portion and the rear body portion, the roof of the cabin portion may be made higher. Further, in the structure as described above, in order to improve the convenience of passage between the cabin portion and the rear body portion, a groove portion extending from the inside of the cabin portion to the inside of the rear body portion may be provided. Therefore, in a structure in which the inside of the cabin portion and the inside of the rear body portion communicate with each other, the rigidity of the cabin portion is likely to decrease. On the other hand, reinforcement of the cabin portion alone requires a great deal of reinforcement that causes an increase in weight and cost.

[0006] Therefore, an object of the present invention is to efficiently reduce deformation of the cabin portion in a connection structure between a cabin portion and a rear body portion in which the inside of the cabin portion and the inside of the rear body portion communicate with each other.

Means for Solving the Problems

[0007] The present invention includes a cabin portion having a cabin opening that opens at its rear end, and a rear body portion having a rear body opening that opens at its front end, and the inside of the cabin portion and the inside thereof communicate with each other through the cabin opening and the rear body opening. The connection structure between the cabin portion and the rear body portion is such that the cabin opening and the rear body opening are connected while being fixed to each other so that no change in the relative positional relationship occurs in any direction with respect to an external force.

[0008] According to this configuration, in a connecting structure of a cabin part and a rear body part including a cabin part having a cabin opening that opens at its rear end and a rear body part having a rear body opening that opens at its front end, and the interior of the cabin part and the interior thereof communicate with each other through the cabin opening and the rear body opening, the cabin opening and the rear body opening are fixed to each other and connected so that no change in the relative positional relationship occurs in any direction with respect to an external force. Therefore, by sharing the force that deforms the cabin part with the rear body part, in the connecting structure of the cabin part and the rear body part where the interior of the cabin part and the interior of the rear body part communicate with each other, the deformation of the cabin part can be efficiently reduced.

[0009] In this case, the cabin opening has a cabin groove portion that is recessed downward at its lower part, the rear body opening has a rear body groove portion that is recessed downward at its lower part, the cabin groove portion and the rear body groove portion have corresponding shapes, and the cabin groove portion and the rear body groove portion may be fixed to each other and connected so that no change in the relative positional relationship occurs in any direction with respect to an external force.

[0010] According to this configuration, the cabin opening has a cabin groove portion that is recessed downward at its lower part, the rear body opening has a rear body groove portion that is recessed downward at its lower part, and in a structure where the cabin groove portion and the rear body groove portion have corresponding shapes, the cabin groove portion and the rear body groove portion are fixed to each other and connected so that no change in the relative positional relationship occurs in any direction with respect to an external force. Therefore, in the cabin groove portion where the rigidity is likely to decrease, by sharing the force that deforms the cabin groove portion with the rear body groove portion, the deformation of the cabin part can be efficiently reduced.

[0011] Further, the cabin opening has a polygonal shape including a plurality of corner portions, and any corner portion of the cabin opening and the rear body opening may be fixed to each other and connected so that no change in the relative positional relationship occurs in any direction with respect to an external force.

[0012] According to this configuration, in a structure where the cabin opening has a polygonal shape including a plurality of corner portions, any corner portion of the cabin opening and the rear body opening are connected while being fixed to each other so that there is no change in the relative positional relationship in any direction with respect to an external force. Therefore, at the easily deformable corner portion, by sharing the force that deforms the corner portion with the rear body opening, the deformation of the cabin portion can be efficiently reduced.

[0013] Further, the cabin opening may have a shoulder anchor portion that supports a seat belt, and a portion of the cabin opening above the height of the shoulder anchor portion of the cabin opening and the rear body opening may be connected while being fixed to each other so that there is no change in the relative positional relationship in any direction with respect to an external force.

[0014] According to this configuration, in a structure where the cabin opening has a shoulder anchor portion that supports a seat belt, a portion of the cabin opening above the height of the shoulder anchor portion of the cabin opening and the rear body opening are connected while being fixed to each other so that there is no change in the relative positional relationship in any direction with respect to an external force. Therefore, at the cabin opening near the shoulder anchor portion that is easily deformed by receiving a large load via the seat belt, by sharing the force that deforms the cabin opening with the rear body opening at a portion above the height of the shoulder anchor portion, the deformation of the cabin portion can be efficiently reduced.

[0015] Further, the cabin opening and the rear body opening may be connected while being fixed to each other so that there is no change in the relative positional relationship in any direction with respect to an external force by a connecting joint whose connecting position can be changed in response to the variation in the positions of the cabin opening and the rear body opening before connection.

[0016] According to this configuration, the cabin opening and the rear body opening are fixed to each other while being connected by a connecting joint that can change the connecting position corresponding to the variation in the positions of the cabin opening and the rear body opening before connection, so that no change in the relative positional relationship occurs in any direction with respect to an external force. Therefore, it is possible to more reliably connect the cabin opening and the rear body opening, which are likely to vary in position due to mounting the cabin section and the rear body section on the chassis during the manufacture of a freight vehicle.

Advantages of the Invention

[0017] According to the connecting structure of the cabin section and the rear body section of the present invention, in the connecting structure of the cabin section and the rear body section in which the inside of the cabin section and the inside of the rear body section communicate with each other, it is possible to efficiently reduce the deformation of the cabin section.

Brief Description of the Drawings

[0018]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Embodiment for Carrying out the Invention

[0019] Hereinafter, the connection structure between the cabin part and the rear body part according to the embodiment of the present invention will be described in detail with reference to the drawings. The connection structure between the cabin part and the rear body part of the present embodiment is applied to, for example, a freight vehicle or the like. As shown in FIG. 1, the connection structure 1 between the cabin part and the rear body part of the present embodiment includes a cabin part 2 having a driver's seat and a passenger seat, and a rear body part 3 having a cargo compartment. The cabin part 2 and the rear body part 3 are each manufactured as separate bodies and are connected to each other after being separately mounted on the vehicle chassis of the automobile. The rear body part 3 has a front door frame 4 at its front end. The cabin part 2 and the rear body part 3 are connected via the front door frame 4.

[0020] As shown in FIG. 2, the cabin part 2 has door openings 14 that open on both sides thereof for the driver's seat and the passenger seat. The cabin part 2 has a cabin opening 5 that opens at its rear end. In the present embodiment, there is no back panel part that is the wall surface at the rear end of the cabin part. The cabin opening 5 has a polygonal shape including a plurality of corner parts 6 and 7. In the present embodiment, the cabin opening 5 has a rectangular shape including a pair of left and right corner parts 6 and a pair of left and right corner parts 7. The cabin opening 5 has a B-pillar 15 that extends in the vertical direction between the door openings 14. The cabin opening 5 has a corner part (lower door opening) 6 at a position approximately the same height as the lower end of the B-pillar 15. The cabin opening 5 has a corner part (upper door opening) 7 at a position higher than the upper end of the B-pillar 15.

[0021] The cabin opening 5 has a shoulder anchor portion 8 that supports a seat belt 13 as shown in FIG. 6 at a position approximately the same height as the upper end of the B-pillar 15. As shown in FIG. 2, the cabin opening 5 has a roof portion 9 at its upper part. The cabin opening 5 has a cabin groove portion 10 that is recessed downward at its lower part. In the present embodiment, the cabin groove portion 10 is recessed downward in a rectangular shape and includes a pair of left and right corner portions 17.

[0022] As shown in FIG. 3, the rear body portion 3 has a rear body opening 11 that opens to the front door frame 4 at the front end thereof. The rear body portion 3 communicates (walk-through) the inside of the cabin portion 2 with the inside thereof via the cabin opening 5 and the rear body opening 11. The cabin opening 5 and the rear body opening 11 are connected to each other while being fixed to each other so that there is no change in the relative positional relationship in any direction with respect to an external force by connecting joints 20, 30, 40, 50.

[0023] Being connected to each other while being fixed to each other so that there is no change in the relative positional relationship in any direction with respect to an external force means, for example, when an external force in any direction is applied to and deforms either one of the cabin opening 5 and the rear body opening 11, the other of the cabin opening 5 and the rear body opening 11 is connected so as to deform following the deformation with almost no change in the relative positional relationship in any direction with respect to the one.

[0024] As shown in FIGS. 3 and 4, the rear body opening 11 has a rear body groove portion 12 that is recessed downward at its lower part. The rear body groove portion 12 is recessed downward in a rectangular shape and includes a pair of corner portions 18. The cabin groove portion 10 and the rear body groove portion 12 have corresponding shapes. The cabin groove portion 10 and the rear body groove portion 12 are connected to each other while being fixed to each other so that there is no change in the relative positional relationship in any direction with respect to an external force by a connecting joint 20 at their respective corner portions 17, 18.

[0025] As shown in FIG. 4, the connecting joint 20 is a plate-like member bent in an L shape corresponding to the shapes of the corners 17 and 18. The connecting joint 20 connects the corner 17 of the cabin groove portion 10 and the corner 18 of the rear body groove portion 12 by bolts 21 inserted through bolt hole portions (not shown). The bolt hole portions have an inner diameter sufficiently larger than the outer diameter of the bolts 21. Thereby, the cabin groove portion 10 of the cabin opening 5 and the rear body groove portion 12 of the rear body opening 11 are fixed to each other while being connected by the connecting joint 20 capable of changing the connecting position corresponding to the variation in the positions of the cabin groove portion 10 of the cabin opening 5 and the rear body groove portion 12 of the rear body opening 11 before connection, so that no relative positional change occurs in any direction with respect to an external force.

[0026] Any corner 6 or 7 of the cabin opening 5 and the rear body opening 11 are connected to each other by connecting joints 30 and 40 while being fixed to each other so that no relative positional change occurs in any direction with respect to an external force. In the present embodiment, the corner 6 of the cabin opening 5 and the rear body opening 11 are connected by the connecting joint 30. Further, the corner 7 of the cabin opening 5 and the rear body opening 11 are connected by the connecting joint 40.

[0027] As shown in FIG. 5, the connecting joint 40 includes a cabin-side fitting 41 attached to the corner 7 of the cabin opening 5 and a rear-body-side fitting 42 attached to the rear body opening 11. The cabin-side fitting 41 includes a bolt long hole portion 43 through which a bolt 44 inserted through a bolt hole portion (not shown) of the rear-body-side fitting 42 is further inserted. The longitudinal direction of the bolt long hole portion 43 extends in the front-rear direction of the cabin portion 2 and the rear body portion 3. Therefore, when the bolt 44 is fixed by a nut 45, the connecting joint 40 can arbitrarily change the relative position in the front-rear direction of the rear-body-side fitting 42 with respect to the cabin-side fitting 41.

[0028] The rear body side fitting 42 includes a bolt hole portion 46 through which a bolt (not shown) inserted through a bolt hole portion (not shown) of the rear body opening 11 is further inserted. The bolt hole portion 46 has an inner diameter sufficiently larger than the outer diameter of the inserted bolt. Therefore, when the rear body side fitting 42 is attached to the rear body opening 11, the connecting joint 40 can arbitrarily change the relative positions in the lateral and vertical directions of the rear body side fitting 42 with respect to the cabin side fitting 41.

[0029] With the above configuration, the corner portion 7 of the cabin opening 5 and the rear body opening 11 are fixed to each other while being connected by a connecting joint 40 capable of changing the connecting position corresponding to the variation in the positions of the corner portion 7 of the cabin opening 5 and the rear body opening 11 before connection, so that no change in the relative positional relationship occurs in any direction with respect to an external force.

[0030] The roof portion 9 of the cabin opening 5 and the rear body opening 11 are connected by a connecting joint 50. The connecting joints 30 and 50 have the same configuration as either the connecting joint 20 or the connecting joint 40. Thereby, the cabin opening 5 and the rear body opening 11 are fixed to each other while being connected by the connecting joints 20, 30, 40, and 50 capable of changing the connecting position corresponding to the variation in the positions of the cabin opening 5 and the rear body opening 11 before connection, so that no change in the relative positional relationship occurs in any direction with respect to an external force.

[0031] As shown in FIG. 3, in the present embodiment, the corner portion 7 and the roof portion 9, which are portions above the height of the shoulder anchor portion 8 of the cabin opening 5, and the rear body opening 11 are connected by the connecting joints 40 and 50 while being fixed to each other so that no change in the relative positional relationship occurs in any direction with respect to an external force.

[0032] In addition, in the present embodiment, as shown in FIGS. 6 and 7, a portion of the shoulder anchor portion 8 of the cabin opening 5 that is at or above the height of the shoulder anchor portion 8 and the rear body opening 11 may be fixed to and connected to each other by a connecting joint 60 so that no change in the relative positional relationship occurs in any direction with respect to an external force. As shown in FIG. 7, the connecting joint 60 includes a cabin-side pipe receiver 61 attached to the cabin opening 5, a rear-body-side pipe receiver 62 attached to the rear body opening 11, and a connecting pipe 63 that connects the cabin-side pipe receiver 61 and the rear-body-side pipe receiver 62.

[0033] The cabin-side pipe receiver 61 can arbitrarily change its position in the front-rear direction and the lateral direction in which the cabin-side pipe receiver 61 is attached to the cabin opening 5 by the same configuration as the connecting joint 20. The rear-body-side pipe receiver 62 can arbitrarily change its position in the lateral direction and the vertical direction in which the cabin-side pipe receiver 61 is attached to the rear body opening 11 by the same configuration as the connecting joint 20. The cabin-side pipe receiver 61 can arbitrarily change its relative position in the front-rear direction with respect to the connecting pipe 63. The rear-body-side pipe receiver 62 can arbitrarily change its relative position in the vertical direction with respect to the connecting pipe 63.

[0034] With the above configuration, a portion of the shoulder anchor portion 8 of the cabin opening 5 that is at or above the height of the shoulder anchor portion 8 and the rear body opening 11 are connected by the connecting joint 60 that can change the connecting position corresponding to the variation in the positions of the cabin opening 5 and the rear body opening 11 before connection, and are fixed to and connected to each other by the connecting joint 60 so that no change in the relative positional relationship occurs in any direction with respect to an external force.

[0035] According to this embodiment, in the connection structure 1 between the cabin part 2 and the rear body part 3, which includes a cabin part 2 having a cabin opening 5 opened at its rear end, and a rear body part 3 having a rear body opening 11 opened at its front end, and the interior of the cabin part 2 and the interior communicate with each other through the cabin opening 5 and the rear body opening 11, the cabin opening 5 and the rear body opening 11 are connected while being fixed to each other so that the relative positional relationship does not change in any direction with respect to an external force. Therefore, by sharing the force that deforms the cabin part 2 with the rear body part 3, in the connection structure 1 between the cabin part 2 and the rear body part 3 where the interior of the cabin part 2 and the interior of the rear body part 3 communicate with each other, the deformation of the cabin part 2 can be efficiently reduced.

[0036] That is, the reinforcement of the conventional single cabin part requires a great deal of reinforcement that causes an increase in weight and cost, such as an increase in the thickness of the constituent sheet metal, the addition of braces, and the addition of reinforcement panels. On the other hand, in this embodiment, by efficiently making the minimum connection of each of the cabin part 2 and the rear body part 3, the required torsional rigidity of the cabin part can be ensured.

[0037] Also, according to this embodiment, the cabin opening 5 has a cabin groove part 10 recessed downward at its lower part, the rear body opening 11 has a rear body groove part 12 recessed downward at its lower part, and in the structure where the cabin groove part 10 and the rear body groove part 12 have corresponding shapes to each other, the cabin groove part 10 and the rear body groove part 12 are connected while being fixed to each other so that the relative positional relationship does not change in any direction with respect to an external force. Therefore, in the cabin groove part 10 where the rigidity is likely to decrease, by sharing the force that deforms the cabin groove part 10 with the rear body groove part 12, the deformation of the cabin part 2 can be efficiently reduced.

[0038] Further, according to the present embodiment, in the structure in which the cabin opening 5 has a polygonal shape including a plurality of corner portions 6 and 7, any one of the corner portions 6 and 7 of the cabin opening 5 and the rear body opening 11 are fixed to each other and connected so that the relative positional relationship does not change in any direction with respect to an external force. Therefore, in the easily deformable corner portions 6 and 7, by sharing the force that deforms the corner portions 6 and 7 with the rear body opening 11, the deformation of the cabin portion 2 can be efficiently reduced.

[0039] That is, in the present embodiment, by fixing the corner portions 6 and 7 and the cabin groove portion 10, which are the causes of the matchbox deformation in which the cabin opening 5 of the cabin portion 2 deforms into a parallelogram shape, to the front door frame 4 of the rear body portion 3, the box rigidity of the cabin portion 2 is shared with the rear body portion 3, and the matchbox deformation can be efficiently suppressed. The reinforcement of the cabin groove portion 10, which is peculiar to the walk-through in which the inside of the cabin portion and the inside of the rear body portion communicate with each other, has a great effect.

[0040] Further, according to the present embodiment, in the structure in which the cabin opening 5 has a shoulder anchor portion 8 that supports the seat belt 13, the portion of the cabin opening 5 that is higher than the height of the shoulder anchor portion 8 and the rear body opening 11 are fixed to each other and connected so that the relative positional relationship does not change in any direction with respect to an external force. Therefore, in the cabin opening 5 near the shoulder anchor portion 8 that is easily deformed by receiving a large load via the seat belt 13, by sharing the force that deforms the cabin opening 5 with the rear body opening 11 at a portion higher than the height of the shoulder anchor portion 8, the deformation of the cabin portion 2 can be efficiently reduced.

[0041] Also, according to the present embodiment, the cabin opening 5 and the rear body opening 11 are fixed to each other so as not to change their relative positional relationship in any direction against an external force by connecting joints 20, 30, 40, 50, 60 capable of changing the connection position corresponding to the variation in the positions of the cabin opening 5 and the rear body opening 11 before connection. Therefore, the cabin opening 5 and the rear body opening 11, which are likely to have variations in position due to the mounting of the cabin part 2 and the rear body part 3 on the vehicle frame during the manufacture of the truck, can be more reliably connected.

[0042] During the manufacture of the truck, the cabin part 2 is mounted on the vehicle frame of the truck, and then the rear body part 3 is mounted on the vehicle frame, and then the cabin part 2 and the rear body part 3 are connected. At this time, variations of about 10 mm in the front-rear direction and several mm in the lateral and vertical directions occur in the positions where the cabin part 2 and the rear body part 3 are mounted on the vehicle frame. However, in the present embodiment, since the connecting joints 20, 30, 40, 50, 60 capable of changing the connection position corresponding to the variation in the positions of the cabin opening 5 and the rear body opening 11 before connection are applied, the cabin opening 5 and the rear body opening 11 can be more reliably connected.

[0043] Hereinafter, the effect of reducing the deformation of the cabin part 2 when an external force is applied to the connection structure 1 between the cabin part 2 and the rear body part 3 of the present embodiment will be described. FIG. 8(A) shows a state in which an external force is applied to the connection structure between the conventional cabin groove part and the rear body groove part. As shown in FIG. 8(A), it can be seen that a large matchbox deformation has occurred. On the other hand, FIG. 8(B) shows a state in which an external force is applied to the connection structure 1 between the cabin part 2 and the front door frame 4 of the rear body part 3 of the embodiment. As shown in FIG. 8(B), in the connection structure 1 of the present embodiment, it can be seen that the matchbox deformation is reduced compared to the conventional connection structure.

[0044] Also, FIG. 9(A) shows a state in which an external force is applied to the connection between the conventional cabin groove portion 10 and the rear body groove portion 12. As shown in FIG. 9(A), it can be seen that the cabin groove portion 10 is deformed such that its relative position with respect to the main body of the cabin portion 2 varies greatly. On the other hand, FIG. 9(B) shows a state in which an external force is applied to the connection between the cabin groove portion 10 and the rear body groove portion 12 of the embodiment. As shown in FIG. 9(B), in the connection structure 1 of the present embodiment, it can be seen that the variation in the position of the cabin groove portion 10 with respect to the main body of the cabin portion 2 is smaller and the deformation is reduced compared to the conventional connection structure.

[0045] As described above, the embodiments of the present invention have been explained, but the present invention is not limited to the above embodiments and can be implemented in various forms.

Explanation of Reference Numerals

[0046] 1... connection structure, 2... cabin portion, 3... rear body portion, 4... front door frame, 5... cabin opening, 6... corner (lower part of door opening), 7... corner (upper part of door opening), 8... shoulder anchor portion, 9... roof portion, 10... cabin groove portion, 11... rear body opening, 12... rear body groove portion, 13... seat belt, 14... door opening, 15... B pillar, 17... corner, 18... corner, 20... connection joint, 21... bolt, 30... connection joint, 40... connection joint, 41... cabin side fitting, 42... rear body side fitting, 43... bolt long hole portion, 44... bolt, 45... nut, 46... bolt hole portion, 50... connection joint, 60... connection joint, 61... cabin side pipe receiver, 62... rear body side pipe receiver, 63... connection pipe.

Claims

1. a cabin part having a cabin opening that opens at its rear end; a rear body part having a rear body opening that opens at its front end, and the interior of the cabin part communicating with the interior thereof via the cabin opening and the rear body opening; comprising: the cabin opening and the rear body opening are connected by a connecting joint whose connecting position can be changed corresponding to the variation in the positions of the cabin opening and the rear body opening before connection, and are fixed to each other so as not to change the relative positional relationship in any direction with respect to an external force while being connected; the connecting joint has a cabin-side fitting attached to the cabin opening and a rear-body-side fitting attached to the rear body opening; the cabin-side fitting includes a bolt elongated hole through which a bolt inserted through the bolt hole of the rear-body-side fitting is further inserted; the longitudinal direction of the bolt elongated hole extends in the front-rear direction of the cabin part and the rear body part; the rear-body-side fitting includes a bolt hole through which a bolt inserted through the bolt hole of the rear body opening is further inserted; the bolt hole has an inner diameter larger than the outer diameter of the inserted bolt, and is a connecting structure between the cabin part and the rear body part.

2. A cabin part having a cabin opening that opens at its rear end; a rear body part having a rear body opening that opens at its front end, and the interior of the cabin part communicating with the interior thereof via the cabin opening and the rear body opening; comprising: the cabin opening and the rear body opening are connected by a connecting joint whose connecting position can be changed corresponding to the variation in the positions of the cabin opening and the rear body opening before connection, and are fixed to each other so as not to change the relative positional relationship in any direction with respect to an external force while being connected; the connecting joint has a cabin-side pipe receiver attached to the cabin opening, a rear-body-side pipe receiver attached to the rear body opening, and a connecting pipe connecting the cabin-side pipe receiver and the rear-body-side pipe receiver; the cabin-side pipe receiver has a configuration in which the positions in the front-rear direction and the lateral direction where the cabin-side pipe receiver is attached to the cabin opening can be arbitrarily changed, and the relative position in the front-rear direction of the cabin-side pipe receiver with respect to the connecting pipe can be arbitrarily changed. The rear body side pipe receiver can arbitrarily change the horizontal and vertical positions at which the cabin side pipe receiver is attached to the rear body opening, and can arbitrarily change the vertical relative position of the rear body side pipe receiver with respect to the connecting pipe. A connecting structure between a cabin part and a rear body part having such a configuration.

3. The cabin opening has a cabin groove portion recessed downward at its lower part. The rear body opening has a rear body groove portion recessed downward at its lower part. The cabin groove portion and the rear body groove portion have corresponding shapes. The connecting structure between the cabin part and the rear body part according to claim 1 or 2, wherein the cabin groove portion and the rear body groove portion are connected while being fixed to each other so that the relative positional relationship does not change in any direction with respect to an external force.

4. The cabin opening has a polygonal shape including a plurality of corners. The connecting structure between the cabin part and the rear body part according to any one of claims 1 to 3, wherein any one of the corners of the cabin opening and the rear body opening are connected while being fixed to each other so that the relative positional relationship does not change in any direction with respect to an external force.

5. The cabin opening has a shoulder anchor portion that supports a seat belt. The connecting structure between the cabin part and the rear body part according to any one of claims 1 to 4, wherein a portion of the cabin opening at or above the height of the shoulder anchor portion and the rear body opening are connected while being fixed to each other so that the relative positional relationship does not change in any direction with respect to an external force.

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