JPH08216935A - Cab locking device for truck - Google Patents

Abstract

PURPOSE: To suppress deformation of a cab and a rear arch by a method wherein, by effectively utilizing a floor frame being the main skeleton of the cab, the dispersion effect of a load is produced. CONSTITUTION: In a truck wherein the central part of the rear end of a cab 2 mounted on a car body frame 1 inclinably centering around the lower part of a front end is disengageably engaged with the central part of a rear arch 3, fixed to the car body frame 1, through a lock mechanism 8, engaging holes are respectively formed in the under surfaces of the rear end parts of a pair of right and left floor frames 7 extending along a longitudinal direction and mounted on the under surface of the floor panel 6 of the cab 2. Hooks 10 pointing to above are arranged in the positions, corresponding to the respective engaging holes, the rear arch 3. The tip of the hook 10 is bent toward a rear to form an engaging part. By thrusting the hook 10 in the engaging hole from below with a given gap therebetween for holding in the operation state of the lock mechanism 8, deformation of the carburetor 2 and the rear arch 3 owing to a load exerted in a longitudinal direction is suppressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cab locking device for a truck, and more particularly to a locking device capable of effectively suppressing deformation of a cab and a rear arch due to a load acting in front of a vehicle. .

[0002]

2. Description of the Related Art In a truck in which a central portion of a rear end of a cab that is tiltably mounted on a vehicle body frame centering on a lower portion of a front end thereof and a central portion of a rear arch fixed to the vehicle body frame are detachably coupled via a lock mechanism , The rear end portions of a pair of left and right floor frames fixed to the lower surface of the floor panel of the cab along the front-rear direction are mounted only on the rear arch fixed to the vehicle body frame via a cab mount or the like, but not fixed. For this reason, when a load along the front-rear direction, such as a seat belt load, acts on the cab, the load concentrates on the tilt hinge and the lock mechanism, which may deform the cab or the rear arch. To be done.

Therefore, conventionally, a reinforcing member is added to the lower rear end of the cab and the rear arch to increase the rigidity of the cab and the rear arch, or in the actual construction of Sho 62-1511.
As disclosed in Japanese Patent Publication No. 88 or Japanese Utility Model Publication No. 3-56464, the cab is deformed by holding the engaging member fixed to the lower rear end of the cab and the receiving member fixed to the rear arch opposite to each other with a predetermined gap. There are things that I tried to suppress.

However, when the reinforcing member is added to the cab and the rear arch to increase the rigidity as in the former case, it is necessary to increase the size of the lock mechanism to avoid the damage of the mechanism due to the reinforcement. However, there is a problem that the weight and the cost increase.

Further, in the latter type, in which the engaging member fixed to the rear end of the cab and the receiving member fixed to the rear arch are engaged to hold the rear end of the cab on the rear arch, the load of Although it is possible to simplify the reinforcement of the cab and the rear arch because the dispersion effect is obtained, it is necessary to fix the engaging member to the lower rear end of the cab, which causes an inconvenience that an increase in weight cannot be avoided.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and a special reinforcing member is obtained by effectively utilizing a floor frame which is a main frame of a cab to obtain a load distribution effect. An object of the present invention is to provide a locking device having a simple structure that can suppress the deformation of the cab and the rear arch without using.

[0007]

In order to solve the above-mentioned problems, the present invention has a cab which is tiltably mounted on a vehicle body frame centering on a lower front end and a central portion of a rear arch fixed to the vehicle body frame. In a truck that is detachably coupled via a locking mechanism, engaging holes are provided respectively on the lower surface of the rear end portions of a pair of left and right floor frames provided on the lower surface of the floor panel of the cab along the front-rear direction, and hooks that face upward. Are provided at positions corresponding to the engagement holes in the rear arch. The hook is bent rearward to form an engaging portion, and the hook is inserted into and held in the engaging hole from below with a predetermined gap in the operating state of the lock mechanism.

[0008]

In the cab locking device for a truck constructed as described above, in a normal state in which the lock mechanism is operating, the hook is inserted into and held in the engaging hole. Since a predetermined gap is secured in the hook, the hook and the floor frame do not interfere with each other to cause abnormal noise. When the lock mechanism is released and the cab is tilted up, the hook smoothly comes out of the engagement hole as the cab is tilted up. Therefore, the cab is tilted up only by performing an operation similar to the conventional one. be able to.

On the other hand, when a forward load acts on the cab, the floor frame tends to move forward. At this time, since the hook is inserted and held in the engaging hole provided in the floor frame when the lock mechanism is operated, only the gap secured between the hook and the engaging hole is provided in the floor frame. Movement is allowed. However, if the floor frame tries to move larger than the gap,
Since the floor frame is prevented from moving due to the engagement action of the hook and the engagement hole, the deformation of the cab is suppressed.

When performing such deformation prevention action,
Since the cab and the rear arch are connected via a lock mechanism arranged in the center and a pair of left and right floor frames and hooks, the load acting on the cab is distributed to the three points on the center and on both the left and right sides and Transmitted.
Also, since the load is distributed using the floor frame, which is the main skeleton of the cab, there is no need to add a special reinforcing member to the rear end of the cab or the rear arch, and the locking device is lightweight. -It can be simplified.

Further, since the engaging portion is formed by bending the front end of the hook rearward, the engaging portion at the front end of the hook is engaged with the engaging hole even when a large forward load is applied. The retaining engagement is made with respect to the rear edge from above. For this,
Even when a large load is applied, the hook does not accidentally escape from the engagement hole, and the reliability of the locking device is improved.

[0012]

Embodiments of the present invention will be described in detail below with reference to the drawings. 1 is a schematic front view of a cab provided with a locking device according to the present invention as seen from the rear, FIG. 2 is a sectional view showing the relationship between the floor frame and the hook shown in FIG. 1, and FIG.
-A sectional view, FIG. 4 is a schematic perspective view of the rear arch shown in FIG. 1 as seen obliquely from the front, and FIG. 5 is a sectional view corresponding to FIG. 2 showing a tilt-up state of the cab in a normal state.

In these figures, the lower front end of the cab 2 is tiltably connected to the front of the body frame 1 of the truck through a tilt hinge (not shown). And
Bracket 4 on rear arch 3 fixed to body frame 1
The rear end of the floor frame 7 fixed to the lower surface of the floor panel 6 of the cab 2 is mounted on the upper surfaces of the pair of left and right cab mounts 5 mounted via the cab mount 5 so that the cab 2 can be mounted via the cab mount 5. The rear portion is supported by the rear arch 3, and the central portion of the rear end of the cab 2 and the central portion of the rear arch 3 are detachably coupled via a lock mechanism 8 to form a tilt cab track.

The lock mechanism 8 is composed of a hook 8a attached to the center of the rear end of the cab 2, an eyebolt 8b attached to the center of the upper surface of the rear arch 3 and an operation mechanism (not shown). Is releasably engaged with and held by the rear arch 3, but the specific structure of the lock mechanism is not limited to the embodiment.

Here, in the present invention, the floor frame 7 is formed of a hat-shaped member. A flange provided on the upper end of the floor frame 7 is welded and fixed to the lower surface of the floor panel 6 to reinforce the cab 2, and an engaging hole 9 is provided in the lower surface of the rear end of the floor frame 7.

A hook 10 which is bent upward is opposed to the engaging hole 9 and is fixed to the front surface of the bracket 4 by a bolt 11. Then, the tip of the hook 10 is bent rearward to form the engaging portion 12, and then the hook 10 is inserted into and held in the engaging hole 9 from below with a predetermined gap in the operating state of the lock mechanism 8. There is.

Reference numeral 13 is a grommet which is fitted in the engaging hole 9 to isolate the insertion space of the hook 10 from the inside of the floor frame 7, and the seat belt 14 is provided on the upper surface of the floor panel 6.
While the anchor plate 15 is disposed, the stiffener 16 facing the anchor plate 15 with the floor panel 16 sandwiched therebetween is superposed on the lower surface of the floor panel 6, and these are fastened and fixed by bolts 17 and nuts 18.

Further, the stiffener 19 fixed to the inner surface of the rear end of the floor frame 7 is also provided with a hole which overlaps with the engagement hole 9, and the rising edge 20 is provided by burring the periphery of this hole, thereby providing a hook. The engaging action of 10 with the engaging portion 12 is stabilized, and the rigidity of the engaging hole 9 is increased.

In the cab locking device for a truck constructed as described above, when the lock mechanism 8 is operated and the cab 2 is engaged and held at the normal position, the hook 10 is locked as shown in FIG. It is rush-held in the engagement hole 9. At this time, since a predetermined gap is secured between the engagement hole 9 and the hook 10, the hook 10 and the floor frame 7 do not interfere with each other and an abnormal noise is not generated.

When the lock mechanism 8 is released and the cab 2 is tilted up, as shown in FIG. 5, as the cab 2 is tilted up, the hook 1 extends from the engaging hole 9 to the hook 1.
In order to smoothly escape 0, the cab 2 can be tilted up as in the case of the conventional tilt cab track.

On the other hand, when a forward load acts on the cab 2, the floor frame 7 tends to move forward. When the lock mechanism 8 is in operation, the hook 10 is inserted and held in the engagement hole 9 provided in the floor frame 7. Therefore, only the gap between the hook 10 and the engagement hole 9 is accommodated in the floor frame. 7 movements are allowed. However, when the floor frame 7 tries to move larger than the gap, the hook 10 engages with the rear edge of the engagement hole 9 to prevent the floor frame 7 from moving, so that the deformation of the cab 2 is suppressed. .

Even when a backward load is applied to the cab 2, the hook 10 is inserted and held in the engaging hole 9 provided in the floor frame 7 while the lock mechanism 8 is operating. The movement of the floor frame 7 is suppressed by the engagement action of the hook 10 and the engagement hole 9, and the cab 2
Deformation is suppressed.

By the way, since the cab 2 and the rear arch 3 are connected through the lock mechanism 8 provided in the central portion, the pair of left and right floor frames 7 and the hook 10, the load acting on the cab 2 is in the central portion and the left and right portions. It is distributed to the three points at both ends and transmitted to the rear arch 3. Also, cab 2
Since the load is distributed by utilizing the floor frame 7 which is the main skeleton of the cab 2, the reinforcing structure of the rear end portion of the cab 2 or the rear arch 3 can be simplified, and the cab 2 can be locked. The weight of the device can be reduced.

Further, since the engaging portion 12 is formed by bending the front end of the hook 10 rearward, the front end of the hook 10 can be prevented even when a large forward load is applied due to a collision or the like. The engaging portion 12 securely engages the rising 20 of the stiffener 10 provided at the edge of the engaging hole 9 from above so as to prevent the stiffener 10 from slipping off. Therefore, the hook 10 does not accidentally escape from the engagement hole 9 and the reliability of the locking device is improved.

That is, FIG. 6 is a cross-sectional view corresponding to FIG. 2 when a large load is applied to the front side. As is clear from this figure, when the floor frame 7 is about to move (deform) largely. Only the hook 10 engages with the rising 20 of the stiffener 19 provided on the periphery of the engaging hole 9 to prevent the floor frame 7 from moving forward and upward, and in a normal state, the engaging hole 9 and Since the gap is secured between the stiffener 20 and the hook 10, the deformation or movement of the cab 2 due to the load directed in the front-rear direction can be suppressed without impairing the tilt characteristics of the cab 2.

In the embodiment, the stiffener 19 provided with the rising 20 along the peripheral edge of the engaging hole 9 is attached to the inner surface of the floor frame 7 to increase the rigidity of the engaging hole 9, but the floor frame 7 is constructed. If the rigidity of the member to be used is sufficient, the rising 20 may be omitted, or the stiffener 19 may be omitted to reduce the weight of the floor frame 7.

Further, as shown in the embodiment, when the boot 13 is attached to the engaging hole 9 to separate the insertion space of the hook 10 from the general part of the floor frame 7, the water splashed from the road surface is removed. Alternatively, dust or the like will not enter the inside of the floor frame 7 through the engagement holes 9.

[0028]

As is apparent from the above description, according to the present invention, the load acting on the cab in the front-rear direction is transmitted to the rear arch via the lock mechanism while being dispersed from the left and right floor frames to the hooks. Since the concentrated load does not act on the rear end portion of the cab and the rear arch by transmitting it to the rear arch, the deformation of the cab and the rear arch can be suppressed without adding a special reinforcing member.

Further, since the floor frame, which is the main skeleton of the cab, is provided with the engaging holes so as to engage with the hooks provided on the rear arch side, the structure of the locking device is simplified and the number of additional parts is increased. The points can be reduced as much as possible,
It is also possible to suppress an increase in weight and cost due to the provision of the locking device.

[Brief description of drawings]

FIG. 1 is a schematic front view of a cab provided with a locking device according to the present invention as viewed from the rear.

FIG. 2 is a cross-sectional view showing a relationship between the floor frame shown in FIG. 1 and hooks.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a schematic perspective view of the rear arch shown in FIG. 1 as seen obliquely from the front.

FIG. 5 is a sectional view corresponding to FIG. 2 showing a tilt-up state of the cab in a normal state.

FIG. 6 is a cross-sectional view corresponding to FIG. 2 when a forward load is applied.

[Explanation of symbols]

 1 Body Frame 2 Cab 3 Rear Arch 4 Bracket 5 Cab Mount 6 Floor Panel 7 Floor Frame 8 Lock Mechanism 9 Engagement Hole 10 Hook 11 Bolt 12 Engagement Part 13 Grommet 14 Seat Belt 15 Anchor Plate 16 Stiffener 17 Bolt 18 Nut 19 Stiffener 20 Rise

Claims (1)

[Claims] 1. A truck in which a central portion of a rear end of a cab that is tiltably mounted on a vehicle body frame centering on a lower portion of a front end thereof and a central portion of a rear arch fixed to the vehicle body frame are detachably coupled via a lock mechanism. While the engaging holes are provided respectively on the lower surfaces of the rear end portions of the pair of left and right floor frames provided on the lower surface of the floor panel of the above, the hooks facing upward are provided at the positions corresponding to the engaging holes in the rear arch. The cab engaging member of the truck is characterized in that the front end of the hook is bent rearward to form an engaging portion, and a hook is inserted into and held in the engaging hole from below with a predetermined gap in the operating state of the lock mechanism. Stop device.