JP3235945B2 - Truck cab locking device - Google Patents

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 on the front of a vehicle. .

[0002]

2. Description of the Related Art In a truck, a rear end center portion of a cab mounted on a body frame so as to be tiltable around a lower front end thereof and a center portion of a rear arch fixed to the body frame are detachably connected via a lock mechanism. The rear ends of a pair of left and right floor frames along the front-rear direction fixed to the lower surface of the cab floor panel are mounted on the rear arch fixed to the vehicle body frame via a cab mount or the like, but are not fixed. For this reason, if a load in the front-rear direction represented by a seat belt load or the like acts on the cab, this load acts intensively on the tilt hinge and the lock mechanism, which may cause deformation of the cab or the rear arch. Is done.

Therefore, conventionally, a reinforcing member has been added to the lower end of the rear end of the cab and the rear arch to increase the rigidity of the cab and the rear arch.
No. 88 or Japanese Utility Model Publication No. 3-56464, the engaging member fixed to the lower rear end of the cab and the receiving member fixed to the rear arch are held opposite to each other with a predetermined gap therebetween to prevent deformation of the cab. There are some that are suppressed.

[0004] However, when the rigidity is increased by adding reinforcing members to the cab and the rear arch as in the former case, it is necessary to increase the size of the lock mechanism to avoid damage to the mechanism in accordance with the reinforcement. However, there is a problem that the weight and cost increase.

[0005] Further, in the case where the engaging member fixed to the rear end portion of the cab and the receiving member fixed to the rear arch are engaged to hold the rear end portion of the cab to the rear arch as in the latter case, the load of the load is reduced. Although the reinforcement of the cab and the rear arch can be simplified because the dispersion effect can be obtained, there is a disadvantage that an increase in weight cannot be avoided because the engaging member needs to be fixed to the lower rear end of the cab.

[0006]

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

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a rear end center portion of a cab mounted on a vehicle body frame so as to be tiltable around a lower front end portion and a center portion of a rear arch fixed to the vehicle body frame. In a truck detachably coupled via a lock mechanism, engaging holes are respectively provided in lower surfaces of rear end portions of a pair of left and right floor frames along a front-rear direction provided on a lower surface of a floor panel of a cab, while hooks facing upward. Are provided at positions corresponding to the engagement holes in the rear arch, respectively. And, in the operating state of the lock mechanism, the hook is inserted into the engagement hole from below with a predetermined gap and held therefrom, and at least the seal member for shutting off the inside and the outside of the floor frame in the operating state of the lock mechanism is provided. I have.

[0008]

In the truck cab locking device constructed as described above, in the normal state in which the lock mechanism is operating, the hook is pushed into the engaging hole and held. , A predetermined gap is ensured, so that the hook and the floor frame do not interfere with each other to generate abnormal noise. When the cab is tilted up by releasing the lock mechanism, the cab is tilted up only by performing the same operation as in the related art in order for the hook to smoothly escape from the engagement hole as the cab is tilted up. be able to.

On the other hand, when a forward-facing load acts on the cab, the floor frame tends to move forward. At this time, in the state where the lock mechanism is operated, the hook is inserted into the engagement hole provided in the floor frame and is held, so that only the gap secured between the hook and the engagement hole is equivalent to the gap of the floor frame. Movement is allowed. However,
If the floor frame attempts to move larger than the gap, the deformation of the cab is suppressed because the movement of the floor frame is prevented by the engagement action of the hook and the engagement hole.

In performing such a deformation preventing action,
Since the cab and 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 three points on the center and both left and right sides, and Is transmitted.
In addition, since the load is distributed by 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, at least in the operating state of the lock mechanism, since the inside and the outside of the floor frame are blocked by the sealing material, water or dust jumped up from the road surface enters the inside of the floor frame from the engagement hole. No rust is generated by intrusion, and the durability of the locking device is ensured.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the 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 a floor frame and hooks shown in FIG. 1, and FIG.
4 is a schematic perspective view of the rear arch shown in FIG. 1 as viewed obliquely from the front, and FIG. 5 is a cross-sectional view corresponding to FIG. 2 showing a cab tilted up state in a normal state.

In these figures, a lower portion of a front end of a cab 2 is tiltably connected to a front portion of a body frame 1 of a truck via 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 along the front-rear direction fixed to the lower surface of the floor panel 6 of the cab 2 is placed on the upper surface of a pair of left and right cab mounts 5 attached via the cab mount 5. The rear cab is supported by a rear arch 3 and the center of the rear end of the cab 2 and the center of the rear arch 3 are removably connected via a lock mechanism 8 to form a tilt cab truck.

The lock mechanism 8 comprises a hook 8a attached to the center of the rear end of the cab 2, an eye bolt 8b attached to the center of the upper surface of the rear arch 3, and an operating mechanism (not shown). Is engaged with and held by the rear arch 3 in a detachable manner, 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 at 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 engagement hole 9 is provided in the lower surface of the rear end of the floor frame 7, respectively.

A hook 10 bent upward is opposed to the engaging hole 9 and fastened to the front surface of the bracket 4 with a bolt 11. Then, after forming the engaging portion 12 by bending the tip of the hook 10 backward, the hook 10 is inserted into the engaging hole 9 from below with a predetermined gap in the operating state of the lock mechanism 8 and held. The seal material 13 is fitted in the engagement hole 9. The sealing member 13 is formed of a so-called waterproof plug, and separates the insertion space of the hook 10 from the inside of the floor frame 7.

An anchor plate 15 for the seat belt 14 is provided on the upper surface of the floor panel 6, and
Stiffener 1 opposed to anchor plate 15 across
6 is superposed on the lower surface of the floor panel 6 and these are fastened and fixed with bolts 17 and nuts 18. Also, a stiffener 19 fixed to the rear end inner surface of the floor frame 7 is provided with a hole that overlaps with the engagement hole 9, and a ridge 20 is formed by burring the periphery of the hole, for example.
The engagement stability of the hook 10 with the engagement portion 12 is ensured, and the rigidity of the engagement hole 9 is increased.

In the truck cab locking device 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 moved as shown in FIG. It is inserted and 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 no abnormal noise is generated.

When the cab 2 is tilted up by releasing the lock mechanism 8, as shown in FIG.
In order for the 0 to escape smoothly, the cab 2 can be tilted up in the same manner as in the case of the conventional tilt cab truck.

On the other hand, when a forward-facing 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 into the engaging hole 9 formed in the floor frame 7 so as to protrude therefrom. 7 movements are allowed. However, when the floor frame 7 attempts to move larger than the gap, the deformation of the cab 2 is suppressed because the hook 10 engages with the rear edge of the engagement hole 9 to prevent the floor frame 7 from moving. .

Even when a rearward load acts on the cab 2, the hook 10 is inserted into the engaging hole 9 formed in the floor frame 7 while the lock mechanism 8 is operated, so that the hook 10 protrudes and is held. The movement of the floor frame 7 is suppressed by the engagement action of the hook 10 and the engagement hole 9 so that the cab 2
Is suppressed.

Since the cab 2 and the rear arch 3 are connected via the lock mechanism 8 provided at the center and the pair of left and right floor frames 7 and the hooks 10, the load acting on the cab 2 is reduced at the center and the left and right. The light is distributed to three points at both ends and transmitted to the rear arch 3. Also, cab 2
Since the load is distributed using the floor frame 7 which is the main skeleton of the cab 2, the reinforcement structure of the rear end portion of the cab 2 or the rear arch 3 can be simplified, and the cab 2 is locked. The device can be reduced in weight.

Further, since the sealing material 13 is fitted in the engaging hole 9 to isolate the insertion space of the hook 10 from the inside of the floor frame 7, water or dust jumped up from the road surface is engaged. Rust does not enter the floor frame 7 through the hole 9 to generate rust, and the durability of the locking device is ensured.

In the case where the engaging portion 12 is formed by bending the tip of the hook 10 backward as shown in the embodiment, even when a large forward load is applied due to a collision or the like. The engaging portion 12 at the tip end of the hook 10 can be securely engaged with the rising portion 20 of the stiffener 10 provided at the edge of the engaging hole 9 from above. For this reason, in the case of the embodiment, the hook 10 does not accidentally escape from the engagement hole 9 and the reliability of the locking device is further improved.

FIG. 6 is a cross-sectional view corresponding to FIG. 2 when a large forward load is applied. As is apparent from FIG. 6, when the floor frame 7 is largely moved (deformed), Only the hook 10 comes into contact with the rising portion 20 of the stiffener 19 provided on the peripheral edge of the engaging hole 9 from above to prevent the floor frame 7 from moving forward and upward. Since the clearance is secured between the cab 2 and 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 above embodiment, the space for inserting the hook 10 is blocked from the inside of the floor frame 7 by the sealing material 13 fitted in the engaging hole 9 so that water or dust does not enter the inside of the floor frame 7. However, as shown in the embodiment shown in FIG.
The hook-shaped sealing material 13a abutting on the lower surface of the peripheral edge is fitted and held on the hook 10, so that the hook 10 is inserted into the floor frame 7 from the engagement hole 9 and held only when the hook 10 is held. It can be closed to prevent water or dust from entering.

As shown in the embodiment shown in FIG. 8, a slit 13c is provided in the grommet-shaped sealing material 13b fitted in the engaging hole 9, and the hook 10 is inserted through the slit 13c. Engagement hole 9
Can be substantially blocked to prevent intrusion of water or dust, but in short, the floor is in a state where the lock mechanism 8 is operated, that is, in a state where the hooks 10 are inserted into the engagement holes 9 and held. What is necessary is just to block the inside and the outside of the frame 7, and the specific configuration of the sealing material is not limited to the embodiment.

In the embodiment, the engaging portion 12 is provided at the tip of the hook 10 to secure the hook retaining effect. However, the engaging portion protruding forward is added to reduce the load against the rearward load. The stability of the hook 10 can be simplified by increasing the joint stability or omitting the engaging portion.

Further, in the embodiment, the stiffener 19 provided with the rising 20 along the periphery 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. When the rigidity of the member to be formed is sufficient, the rising 20 can be omitted, or the stiffener 19 can be omitted to reduce the weight of the floor frame 7.

[0030]

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

Further, since the engaging holes are provided in the floor frame, which is the main skeleton of the cab, 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 score can be reduced as much as possible,
The increase in weight and cost due to the provision of the locking device can also be suppressed.

Further, when the lock mechanism is operated, the inside and outside of the floor frame are substantially blocked off by the sealing material, so that water or dust jumped up from the road surface is engaged. The rust does not enter the floor frame or the floor panel from the hole to generate rust on the floor frame or the floor panel, so that the durability of the locking device is ensured.

[Brief description of the 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 sectional view showing a relationship between a floor frame and hooks shown in FIG. 1;

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 viewed obliquely from the front.

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

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

FIG. 7 is a cross-sectional view showing a modification of the sealing material.

FIG. 8 is a cross-sectional view showing another modification of the sealing material.

[Explanation of symbols]

 DESCRIPTION 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, 13a, 13b Seal material 13c Slit 14 Seat belt 15 Anchor plate 16 Stiffener 17 Bolt 18 Nut 19 Stiffener 20 Rise

Claims (1)

(57) [Claims] 1. A truck in which a rear end center portion of a cab mounted on a vehicle body frame so as to be tiltable around a lower front end thereof and a center portion of a rear arch fixed to the vehicle body frame are removably connected via a lock mechanism. A pair of right and left floor frames along the front-rear direction provided on the lower surface of the floor panel are provided with engaging holes on the lower surfaces of the rear ends thereof, and hooks facing upward are provided at positions corresponding to the engaging holes in the rear arch, respectively. A truck, characterized in that a hook is inserted and held from below in the engagement hole with a predetermined gap in an operating state of the mechanism, and a seal member is provided at least for blocking the inside and the outside of the floor frame in an operating state of the lock mechanism. Cab locking device.