JP2000318659A - Backpanel structure of cab for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a back panel structure of a vehicle cab capable of securing sufficient rigidity and strength for a cab while evading increase of vehicle weight. SOLUTION: This backpanel structure is provided with the first member 13 in an underside of an opening part 8a of a backpanel 8, the second members 14 for connecting both ends of the first member 13 to a roof 5, the third members 15 for connecting body supporting parts 10 for supporting a rear side of a cab 1, the fourth members 16 for connecting both ends of the first member 13 to the both body supporting parts 10, and the fifth member 17 for connecting the both supporting members 10 to the first member 13. Compressive force acting on the body supporting members 10 when a vehicle travels on a rough road or is overturned is dispersed to the respective members 13-17 to be counteracted efficiently.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a back panel structure of a cab for a vehicle such as a truck.

[0002]

2. Description of the Related Art As a structure of a cab generally used for a truck or the like, for example, as described in Japanese Utility Model Laid-Open No. 4-132889, an outer wall is reinforced with a reinforcing material, and stress is applied to the outer wall and the reinforcing material. There is a monocoque structure that allows the stress to be applied to a frame structure disposed inside, as described in Japanese Patent Application Laid-Open No. 10-100945, and the like, which is appropriately adopted according to the type and use of the vehicle. And, needless to say, the back panel on the rear surface of the cab is also configured by the above-described method.

[0003] On the other hand, the cab thus constructed is fixed on the frame of the vehicle, but it is necessary to take care that the engine and the like arranged immediately below can be maintained. For this reason, the cab is configured such that the front side is connected to the frame via a pair of left and right hinge mechanisms and the rear side is mounted on the frame via a pair of left and right mounts, and is tilted about the hinge mechanism. In addition, the rear side of the cab is latched to the frame side by a latch mechanism in order to hold the cab in a normal posture (a posture at the time of non-tilt).

[0004]

The above-mentioned cab needs to have a rigidity capable of suppressing vibration and noise during running of the vehicle, and a strength capable of preventing deformation at the time of falling down and securing an occupant space. Also, the back panel that is a part of the structure is required to have sufficient rigidity and strength. For example, when the vehicle is traveling on rough roads, inertial forces due to its own weight are applied to the cab alternately downward and upward according to the ups and downs of the road surface. On the rear side of the cab, downward inertial force is received by the mount, and upward inertial force is stopped by the latch mechanism. The inertial force acting on the mount and the latch mechanism at this time acts on the back panel as a reaction force. When the vehicle falls, the weight of the vehicle acts on the roof of the cab, and the weight of the vehicle is received by the hinge mechanism via the front pillars and dash panels on the front side of the cab, and the back panel on the rear side of the cab. Is received by the mount via. That is,
The vehicle weight at this time also acts on the back panel.

However, in the conventional back panel structure, as described above, the external force acting on the back panel is not carefully considered for each situation, but merely by appropriately arranging a reinforcing material or a frame structure for reinforcement. Did not. Therefore, improper reinforcement is performed to secure the required rigidity and strength, and as a result, the weight of the back panel increases significantly, and the vehicle weight increases.

An object of the present invention is to provide a back panel structure of a cab for a vehicle, which can secure sufficient stiffness and strength of the cab while avoiding an increase in vehicle weight.

[0007]

In order to achieve the above object, according to the first aspect of the present invention, a first member member extending in a vehicle width direction at a position below an opening of a back panel of a cab; A second member member for connecting both ends of the first member member to the roof, a third member member for connecting a body support portion for supporting the rear side of the cab, and both body support portions for connecting both ends of the first member member to the roof And a fifth member member for connecting both vehicle body supporting portions to the center portion of the first member member in the vehicle width direction.

Accordingly, when the vehicle is traveling on a rough road, the first member member and the third member member, which are mainly arranged in a quadrangular shape, respond to the compressive force acting on the vehicle support portion of the back panel due to the weight of the cab. The member member and the fourth member member oppose each other, and the second member member and the fourth member member mainly oppose the vertical compressive force acting on the back panel when the vehicle falls. I do. Since the external forces acting as described above are dispersed and efficiently opposed, the strength required for each member member is reduced, and the weight can be reduced.

According to the second aspect of the present invention, the vehicle body engaging portion for engaging the rear side of the cab is connected to the vicinity of the center of the fifth member member by the sixth member member. During traveling, the fifth member member and the sixth member member arranged in a truss shape oppose a tensile force acting on the vehicle body retaining portion of the back panel due to the weight of the cab.

Further, according to the third aspect of the present invention, since the two fifth member members are connected to each other at the center of the first member member in the vehicle width direction, the first member member and the fifth member member are connected to each other. It forms a perfect truss shape, and can more strongly counter the tensile force acting on the vehicle body hook.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is embodied in a back panel structure of a truck cab will be described below. FIG. 1 is a perspective view showing the entire configuration of the cab, and shows a state before a front window and a door are assembled. The cab 1 has a box shape having openings 2 and 3 for a front window and left and right doors, and a front surface thereof is formed by a dash panel 6 connected to a roof 5 via left and right front pillars 4. The left and right sides are formed by a quarter panel 7. The rear surface of the cab 1 is formed by a back panel 8 having an opening 8a for a rear window at the center, and the bottom surface is formed by a floor panel 9.

A pair of main sills (not shown) are provided on the lower surface of the floor panel 4 at intervals in the left-right direction (vehicle width direction).
These main sills extend in the front-rear direction of the vehicle body. Although not shown, the front ends of both main sills are connected to the frame of the vehicle by a hinge mechanism, and the rear ends are mounted on the frame via mounts. The entire cab 1 can be tilted forward around the hinge mechanism. The rear end of the cab 1 can be hooked on the frame side by a latch mechanism, and the cab 1 is normally held in a non-tilt position by the latch mechanism during normal operation other than engine maintenance.

On the other hand, the rear ends of the left and right main sills are connected to the lower edge of the back panel 8, so that the back panel 8 is supported from below at these connection points. (Shown by an upward arrow in the figure). Further, since the latch mechanism is mounted at the middle of the rear ends of both main sills, the back panel 8 is hooked from below at this mounting location. Hereinafter, this location is connected to the vehicle hooking section 11 (downward in the figure). Arrow).

On the inner surface of the back panel 8 (inside the cabin),
Numerous member members are arranged as reinforcements for securing rigidity and strength, avoiding the opening 8a of the rear window. Hereinafter, an arrangement state of each member member will be described with reference to FIG. 2. The opening 8 a of the back panel 8 has a horizontally long rectangular shape, and the first member member 1 is located below the opening 8 a.
3 extend in the left-right direction. The left and right ends of the first member member 13 slightly protrude left and right from both sides of the opening 8a.
4 are connected at their lower ends. The second member members 14 extend substantially vertically on the left and right sides of the opening 8a of the back panel 8, and the upper ends thereof are connected to the roof 5 of the cab 1, respectively.

The two vehicle supporting portions 10 are connected to each other by a third member member 15, and the vehicle engaging portion 11 is located at a central portion on the third member member 15. Upper ends of fourth member members 16 are connected to left and right ends of the first member member 13, respectively. These fourth member members 16 extend obliquely downward so as to approach each other, and have lower ends thereof. Are connected to the vehicle support 10 respectively. The fifth member member 1 is attached to both vehicle support portions 10.
7 are connected to each other, and the other ends of the fifth member members 17 are connected to the left and right central portions of the first member member 13 and are connected to each other at this central portion. .

On the other hand, one end of a pair of sixth member members 18 is connected to the vehicle engaging portion 11, and the other ends of these sixth member members 18 are located near the central portions of the fifth member members 17. Respectively. The first to sixth member members 13 to 18 are manufactured by press-forming a steel plate, and are welded to the inner surface of the back panel 8 to form a closed section.

Needless to say, the above arrangement of the member members 13 to 18 is a result of consideration so that an external force acting on the back panel 8 can be efficiently countered when the vehicle is running or the vehicle falls down. The rationale for the arrangement is explained. First, when the vehicle is traveling on a rough road, inertia forces downward and upward due to its own weight act on the cab 1 alternately according to the undulation of the road surface. On the front side of the cab 1, both the vertical inertia force is supported by a hinge mechanism, and on the rear side of the cab 1, the downward inertia force is received by the mount, and the upward inertia force is stopped by the latch mechanism. . Therefore, when the downward inertial force is received by the mount, the reaction force acts on the vehicle support portion 10 of the back panel 8 as an upward compressive force, and the upward inertial force is stopped by the latch mechanism. When this occurs, the reaction force acts as a downward pulling force on the vehicle engaging portion 11 of the back panel 8.

Since the inertial force due to its own weight has a greater effect on the lower side of the cab 1, the compressive force applied to the vehicle support 10 at this time mainly acts on the lower side of the opening 8a of the rear window 8. As shown in FIG. 3, if the reinforcing members 21 to 23 are arranged in a square shape so as to surround this portion, it is possible to oppose the compressive force. Here, in the back panel structure of the present embodiment, the first member member 13 plays the role of the reinforcing member 21 below the opening 8a, and the third member 22 plays the role of the reinforcing member 22 connecting the two vehicle support parts 10. The fourth member member 16 plays the role of the reinforcing members 23 on both the left and right sides.

Similarly, since the pulling force applied to the vehicle engaging portion 11 mainly acts on the lower side of the opening 8a, as shown in FIG.
It is necessary to arrange the reinforcing members 24-26 in a truss shape so as to resist the tensile force. In other words, one end of the pair of reinforcing members 24 is abutted to function as a beam, and the reinforcing members 25 are crossed to reinforce these reinforcing members 24, and the center of the reinforcing members 24 is connected to the vehicle via the reinforcing members 26. Hook 11
, It can be made to resist the tensile force. Here, in the back panel structure of the present embodiment, the vehicle hooking section 1
The role of the reinforcing member 26 directly connected to the
The fifth member member 17 plays the role of the reinforcing members 24 and 25 intersecting each other. The reason why the fifth member member 17 also functions as the reinforcing members 24 and 25 is that the fifth member member 17 is supported from below by using the vehicle support portion 10.

That is, in the back panel structure of the present embodiment, each reinforcing member 2 shown in FIGS.
All of the requirements 1 to 26 are provided. Therefore, the compression force applied to the vehicle support portion 10 due to the rough road running and the vehicle locking portion 1
1 can be efficiently distributed by distributing the tensile force to each of the member members 13, 14 to 18.
Since the strength required for 3, 14 to 18 is reduced and the weight can be reduced, the rigidity of the cab 1 is sufficiently secured while avoiding an increase in the vehicle weight, thereby suppressing vibration and noise. be able to.

In addition, as described above, the fifth member 1
7 are connected not only to the left and right central portions of the first member member 13 but also to each other at this central portion, so that the first member member 13 and the fifth member member 1 are connected to each other.
7 is a positional relationship for forming a complete truss shape required in FIG. That is, as compared with the case where the left and right fifth member members 17 are connected to the first member member 13 in a separated state, the pulling force acting on the vehicle engaging portion 11 is more strongly opposed. Thus, the stiffness of the cab 1 can be further improved.

On the other hand, when the vehicle falls, the weight of the vehicle acts on the roof 5 of the cab 1, and on the front side of the cab 1, its weight is received by the hinge mechanism via the front pillar 4 and the dash panel 6. On the rear side of the cab 1, the cab 1 is received by a mount via a back panel 8. Therefore, the back panel 8 is
A vertical compressive force is applied between the vehicle support portion 11 and the vehicle support portion 11, and the compressive force can be countered by disposing the reinforcing members 27 and 28 vertically as shown in FIG.

Here, in the back panel structure of the present embodiment, the second member member 14 plays the role of the reinforcing members 27 on both the left and right sides of the opening 8a, and the reinforcing members 28 continuous below the second member member 14.
Since the fourth member 16 plays the role of, all the requirements of the reinforcing members 27 and 28 shown in FIG. Therefore, the compressive force between the roof 5 and the vehicle supporting portion 11 caused by the overturn can be dispersed to the respective member members 14 and 16 to efficiently oppose each other, and the strength required for the individual member members 14 and 16 can be obtained. Is reduced and the weight can be reduced, so that the strength of the cab 1 is sufficiently secured while avoiding an increase in the vehicle weight, and thus the deformation of the cab 1 when the vehicle falls down is suppressed, thereby ensuring the occupant space. Can be secured.

Although the embodiment has been described above, aspects of the present invention are not limited to this embodiment. For example, in the above-described embodiment, the back panel structure of the truck cab is embodied, but the vehicle to be applied is not limited to a truck as long as it has a cab. Further, in the above-described embodiment, the vehicle engaging portion 11 and the vicinity of the central portion of the fifth member member 17 are connected by the sixth member member 18 so that the pulling force acting on the vehicle engaging portion 11 when traveling on a rough road. However, if the rigidity of the back panel 8 is sufficient, the sixth member 18 may be omitted, or if the rigidity of the back panel 8 is required, Further, a member member may be added. Similarly, the fifth member member 1
7 are connected to each other on the first member member 13, but if the rigidity of the back panel 8 is sufficient, the fifth member members 17 may be separated without being connected.

Further, in the above embodiment, the back panel 8
Although the member members 13 to 18 are arranged on the premise that the opening 8a of the rear window is provided in the back panel 8, for example, a cold storage material that continues cooling even after the engine is stopped by storing cold during cooling is provided on the back panel 8. In such a case, it is necessary to provide an opening for the cold storage material. Therefore, in such a case, the arrangement of the member members 13 to 18 of the above embodiment may be applied.

[0026]

As described above in detail, according to the back panel structure of the vehicle cab according to the first aspect of the present invention, the entire back panel is caused by a compressive force applied to the vehicle support portion caused by running on a rough road or a fall. In order to effectively distribute the compressive force to each member member, avoid increasing the vehicle weight and secure sufficient stiffness and strength of the cab to suppress vibration and noise when traveling on rough roads At the same time, the deformation of the cab at the time of falling can be suppressed, and the occupant space can be reliably secured.

According to the back panel structure of the cab for a vehicle according to the second aspect of the present invention, the pulling force applied to the vehicle hooking portion due to the rough road running is distributed to the respective member members so as to efficiently oppose each other. It is possible to further increase the stiffness of the cab while avoiding an increase in vehicle weight. Further, according to the back panel structure of the cab for a vehicle according to the third aspect of the present invention, since the first member member and the fifth member member form a complete truss shape, the tensile force acting on the vehicle body engaging portion is provided. The rigidity of the cab can be further improved by more strongly opposing the force.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an overall configuration of a truck cab according to an embodiment.

FIG. 2 is an explanatory diagram showing an arrangement state of each member member.

FIG. 3 is an explanatory view showing a reinforcing member that opposes a compressive force applied to a vehicle support.

FIG. 4 is an explanatory view showing a reinforcing member that opposes a pulling force to a vehicle hooking portion.

FIG. 5 is an explanatory view showing a reinforcing member that opposes the vehicle weight on the roof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cab 5 Roof 8 Back panel 8a Opening 10 Vehicle support part 11 Vehicle hooking part 13-18 1st-6th member member

Claims (3)

[Claims] A first member member extending in a vehicle width direction at a position below an opening formed in a back panel of the cab; and a first member member disposed on both sides of the opening of the back panel, A second member member for connecting the left and right ends of the first member member to the roof of the cab, and a third member member for connecting a pair of left and right vehicle body support portions for supporting the rear side of the cab from below. A fourth member member connecting left and right ends of the first member member to the vehicle body supporting portions, respectively; and a vehicle member in the vehicle width direction of the first member member with respect to a vehicle width direction central portion. And a fifth member member connected to the back panel structure. 2. A vehicle body engaging portion, which is disposed at a central portion in the vehicle width direction on the third member member and engages a rear side of the cab from below, is provided near a central portion of the fifth member members. The back panel structure of a vehicle cab according to claim 1, wherein the vehicle cab is connected to each other by a sixth member member. 3. The vehicle according to claim 1, wherein the two fifth member members are connected to each other at a central portion in the vehicle width direction of the first member member. Cab back panel structure.