JP3539193B2 - Cab bridge structure - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a cab bridge structure for supporting a rear end portion of a cab to a chassis frame in a vehicle such as a cab-over type truck.
[0002]
[Prior art]
The structure of a cab bridge in a conventional cab-over type truck will be described with reference to an exploded perspective view of FIG. In the figure, reference numeral 01 generally indicates a cab bridge. The cab bridge 01 is provided on a pair of left and right side rails extending in the vehicle front-rear direction of the chassis frame and arranged at intervals in the vehicle width direction. Left and right side bridge members 02 fixed at the lower end portions thereof and extending upward, and center bridge members arranged so as to extend in the vehicle width direction and having both ends fixed to the upper end portions of the left and right side rails 02. 03, and are formed so that the front shape is an inverted U-shape or a portal shape as a whole.
[0003]
Each of the left and right side bridge members 02 and the center bridge member 03 is a member having a hat-shaped basic sectional shape. The upper end portion of the side bridge member 02 and both end portions of the center bridge member 03 are partially And are integrally connected by welding 04. Note that a locking device is disposed at a substantially central portion in the vehicle width direction of the center bridge member 03 below a central portion of the rear end of the cab (not shown) in the vehicle width direction, and locks a rear portion of the cab with respect to the cab bridge 01. An elliptical through-hole 05 for accommodating some of the constituent members is provided.
[0004]
A mount bracket 06 having a substantially triangular front shape is fixed to the outside of the upper portion of the left and right side bridge members 02 by welding 07, and a rubber bracket 010 is mounted on each mount bracket 06 by bolts 08 and 09. You. The outer mounting rubber 011 is attached to the rubber bracket 010, and the inner mounting rubber 013 is attached to the inclined surface 012 of the side bridge member adjacent to the mounting bracket 06, and the inner and outer mountings are mounted. Rubbers 011 and 013 form a V-shaped elastic support portion. The V-shaped elastic support portions directly support the V-shaped engagement portions provided on both sides of the rear end of the cab, or both ends in the vehicle width direction of the floating bar disposed below the rear end of the cab. Supports the V-shaped engaging portion provided on the rim.
[0005]
In the above-mentioned conventional cab bridge structure, the left and right side bridge members 02 and the center bridge member 03 bridged therebetween are fixed by welding 04, and the left and right mounting brackets 06 are fixed to the side bridge member 02 by welding 07. Therefore, required assembly accuracy cannot be ensured unless free displacement such as bending or twisting of each member due to thermal deformation is suppressed by strongly restraining each member with a strong welding assembly jig. There is a disadvantage that the assembly jig becomes large and expensive, and there is a tendency for quality variations (such as entrapment of slugs and occurrence of blowholes) to occur in the welded parts, and there is concern about reliability. There is a problem that the cost increases.
[0006]
[Problems to be solved by the invention]
The present invention has been made in order to solve the above-mentioned drawbacks of the conventional cab bridge structure. The cab bridge can be easily assembled with a very simple and inexpensive jig, and the assembling accuracy can be secured. It is a primary object of the present invention to provide an inexpensive cab bridge structure which is easy, has little variation in quality, and has excellent durability and reliability.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides an inverted U-shape in which the lower end portions on both sides are fixed to a pair of left and right side rails extending in the vehicle front-rear direction and arranged at intervals in the vehicle width direction. In the cab bridge, the cab bridge is formed by bridging between the left and right side bridge members, each having a lower end fixed to the left and right side rails and extending upward, and the upper end of the left and right side bridge members. is formed from a center bridge member extending in a direction, the both upper ends and the left and right ends of the center bridge member are overlapped to form a respective hat-shaped cross section, the tube between the side wall portions facing each of the respective The upper end portion and the left and right end portions are separated from each other by a bolt which penetrates each of the side wall portions and the cylindrical collar and a nut fastened to the bolt. Is proposes a cab bridge structure, characterized in that it is fixed.

[0008]
According to the above configuration, the left and right side bridge members and the center bridge member that bridges and connects the upper ends of both side bridge members are connected by bolts and nuts. A cab bridge that can easily secure the required assembly accuracy with an extremely simple jig as compared to a rigid jig that has a strong structure, and that is easy to assemble and has excellent durability and reliability. A structure is obtained, and the upper end of the left and right side bridge members and the left and right end portions of the center bridge member are overlapped with each other in a hat-shaped cross-sectional shape, and are arranged between the opposed side walls. It is fixed by a bolt inserted through the collar and each side wall and a nut fastened to the bolt, thereby preventing the hat-shaped sectional shape from being deformed. While, it is possible to connect the left and right ends of the upper end and the center bridge member of the left and right side bridge member.

[0009]
In the present invention, the cab mount rubber device interposed between the cab bridge and the cab and fixed to the cab bridge is overlapped with the upper end portions of the left and right side bridge members and both end portions of the center bridge member. It is preferable that bolts are respectively inserted through the top plates at the upper end portion and the both end portions, and the nuts fastened to the bolts are jointly fastened and fixed. With this configuration, the left and right side bridge members, the center bridge member, and the cab mount rubber device that constitute the cab bridge can be assembled and connected at the same time, so that the quality can be easily secured and the assembling work is further simplified. ized, it is Rukoto reduce costs.

[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a preferred embodiment of the present invention will be specifically described with reference to FIGS.
First, in the exploded perspective view of FIG. 1, the front view of FIG. 2, and the side view of FIG. 3, reference numeral 10 generally indicates a cab bridge whose front shape is an inverted U-shape or a gate shape, and the cab bridge 10 The lower ends of the pair of right and left cross-sections are formed in a U-shape and extend in the front-rear direction of the vehicle and are disposed at intervals in the vehicle width direction. A pair of left and right side bridge members 14 extending upwardly, a center bridge member 16 arranged to extend in the vehicle width direction, and bridging and connecting upper end portions of the left and right side bridge members 14; A cab mount rubber device 18 disposed outside the upper portion of the side bridge member 14.
[0011]
The left and right side bridge members 14 and the center bridge member 16 each have a hat-shaped cross-sectional shape. Further, the cab mount rubber device 18 has a U-shaped liquid fixing rubber mount 18a, which is known per se and has a characteristic that it is soft in the vertical direction and hard in the left and right directions, and an outer cylinder 18b of the liquid sealing rubber mount 18a. And an inner cylinder 18d concentrically arranged with respect to the outer cylinder 18b. By inserting a support bolt (not shown) into the inner cylinder 18d, both ends of the floating bar 20 indicated by a two-dot chain line in FIG. 2 are elastically supported. A rear end portion of the cab not shown is mounted.
[0012]
As shown in the exploded perspective view of FIG. 1 and FIGS. 6 and 7, two bolt holes 22 are formed in the top plate having a hat-shaped cross section at both ends in the vehicle width direction of the center bridge member 16. At the same time, bolt holes 24 which are aligned in the horizontal direction are formed in opposing vertical side walls. As shown in the exploded perspective view of FIG. 1 and FIGS. 4 and 5, a hat-shaped upper part of the left and right side bridge members 14 overlapped and connected to both ends of the center bridge member 16. Two bolt holes 26 aligned with the bolt holes 22 are formed in the top plate of the cross section, and bolt holes 28 that are aligned in the horizontal direction are formed in opposing vertical side walls. . A hollow tubular collar 30 having substantially the same inner diameter as the bolt hole 28 is coaxially provided inside the side wall portion where the bolt hole 28 is formed.
As shown in FIGS. 2 and 4, on the inner side surfaces of the left and right side bridge members 14 on the side rail 12 side, for convenience in fixing the side bridge members 14 to the side rails 12. Is provided with a contact plate 32 which is in contact with the upper flange 12F of the side rail. (Note that the contact plate 32 is not shown in FIG. 1.)
[0013]
To assemble the left and right side bridge members 14 and the center bridge member 16, both ends of the center bridge member 16 are overlapped with the upper portion of the side bridge member 14 so that the bolt holes 22 and the bolt holes 26 are aligned. After the bolt holes 24 are aligned with the holes 28, the two bolt holes 34 formed in the mount bracket 18c of the cab mount rubber device 18 are aligned with the bolt holes 22 and 26, and the bolt 36 is connected to these bolt holes 22 and 26. This is performed by tightening the nut 38 by inserting the bolt 40 into the bolt holes 34, 22 and 26, and tightening the nut 42 by inserting the bolt 40 through the bolt holes 24 and 28 and the collar 30. The collar 30 is effective for preventing the deformation of the hat-shaped cross section due to the tightening of the bolt 40.
[0014]
According to the above configuration, it is not necessary to suppress the bending and torsional deformation around the heat-affected zone of the side bridge member 14 and the center bridge member 16 due to the heat input with a strong restraining force as compared with the cab bridge of the conventional welding structure. In addition, the assembly jig has an advantage that a simple and inexpensive assembly merely for ensuring the assembly accuracy is sufficient. Further, in the illustrated structure, the cab bridge 10 is assembled by the three bolts 36 and 40 on each of the left and right sides, so that the assembling operation is simple and the operation cost can be greatly reduced as compared with welding. Further, the quality can be easily secured by controlling the tightening torque of the bolts 36 and 40, so that there is an advantage that the reliability is excellent.
[0015]
Further, according to the above configuration, the cab mount rubber device 18 is fastened and fixed together by a plurality of (two in the illustrated case) bolts 36 connecting the side bridge member 14 and the center bridge member 16, so that the assembling work is performed. Has the advantage of being simpler.
[0016]
Reference numeral 44 in the drawing denotes a center bridge member 16 provided at a central portion in the vehicle width direction, and a lower part of the rear end of the cab which is provided at a substantially central portion in the vehicle width direction and constitutes a lock mechanism (not shown). It is an elliptical through hole that accommodates a part. Reference numeral 46 denotes a reinforcing member attached to a portion for fixing the lower end portions of the left and right side bridge members 14 to the web of the side rails 12 with bolts or rivets. Reference numeral 48 denotes a reinforcing member extending in the vehicle width direction. A cross member that connects the rails 12 together and forms a ladder-type chassis frame together with the side rails 12.
[0017]
Note that the present invention is not limited to the above-described embodiment, and various changes and modifications can be made within the scope of the claims. For example, the rear end of the cab can be directly supported by the cab bridge 10 by omitting the floating bar 20, and the cab mount rubber device 18 is replaced with a liquid ring type rubber mount, and a cushion arranged in a usual V-shape. Rubber can be provided.
[0018]
【The invention's effect】
As described above, the cab bridge structure according to the present invention has the lower ends on both sides fixed to a pair of left and right side rails that extend in the vehicle front-rear direction and are arranged at intervals in the vehicle width direction. In the inverted U-shaped cab bridge, the cab bridge extends between the left and right side bridge members, which have their lower ends fixed to the left and right side rails and extend upward, and the upper ends of the left and right side bridge members. It is formed from a center bridge member extending crosslinked vehicle width direction, side walls and left and right end portions of both the upper end and the center bridge member are overlapped to form a hat-shaped cross section, respectively, facing each of the respective A cylindrical collar is disposed between the two portions, and the upper end portions and the left and right sides are formed by a bolt that penetrates each of the side wall portions and the cylindrical collar and a nut that is fastened to the bolt. Characterized in that the end portions are respectively fixed, without requiring structural complex and robust assembly jig, it is possible to perform quickly and easily and accurately assembled, low manufacturing cost, yet is easy to ensure quality There is an advantage that durability and reliability are excellent.
Further, in the present invention, a cab mount rubber device that is fixed to the cab bridge interposed between the cab bridge and cab, the upper end of the left and right side bridge member, with both ends of the center bridge member The cab bridge structure is simplified by assembling the bolts and the nuts fastened to the bolts, which penetrate the upper end portions and the top plate portions at the left and right end portions, respectively, to simplify the structure of the cab bridge and assemble it. There is the advantage that the work can be performed more quickly and easily and therefore at a lower cost.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing a preferred embodiment of the present invention.
FIG. 2 is a front view of the cab bridge shown in FIG.
FIG. 3 is a side view of the cab bridge shown in FIG.
FIG. 4 is a side view of the side bridge member 14 in FIG.
FIG. 5 is an end view of the upper end portion of the side bridge member 14 as seen from the direction of arrow V in FIG.
FIG. 6 is a partial front view of the center bridge member 16 in FIG.
FIG. 7 is a partial plan view of the center bridge member 16 shown in FIG.
FIG. 8 is an exploded perspective view showing the structure of a conventional cab bridge.
[Explanation of symbols]
10 cab bridge, 12 side rail, 14 side bridge member, 16 center bridge member, 18 cab mount rubber device, 20 floating bar, 30 collar, 36 and 40 bolt.

Claims (2)

An inverted U-shaped cab bridge in which the lower end portions on both sides are fixed to a pair of left and right side rails extending in the vehicle front-rear direction and arranged at intervals in the vehicle width direction. Formed from left and right side bridge members that have their lower ends fixed to the left and right side rails and extend upward, and a center bridge member that extends between the upper ends of the left and right side bridge members and extends in the vehicle width direction. is, the both upper ends and the left and right ends of the center bridge member are overlapped to form a respective hat-shaped cross section, is a tubular collar disposed between side walls opposing each, each side wall and calibration, characterized in that the bolt and the nut is tightened to the bolt inserting the cylindrical collar, and the said two upper portions and the right and left end portions are respectively fixed Bridge structure. According to claim 1, cab mount rubber device that is fixed to the cab bridge interposed between the cab bridge and cab, the upper end of the left and right side bridge member, with both ends of the center bridge member, A cab bridge structure, wherein the cab bridge structure is fixed together by a bolt inserted into each of the upper end portions and the top plate portions at the left and right end portions and a nut fastened to the bolt .

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