JPH06156169A - Front grille of cab-over engine truck - Google Patents

Abstract

PURPOSE:To eliminate the interruption of a front grille of a cab-over engine truck with a frame when a cab is elevated. CONSTITUTION:A front grille 11 which is arranged to the front lower part of a cab of a cab-over engine truck and on the lower part of which on the right and left side a head lamp is mounted is divided into an upper and a lower part, constituted by a front grille upper part 11a to be fixed to the cab, and a front grille lower part 11b to be forward rotatably mounted on the front grille upper part through a hinge 12. In addition, a cylinder 14 which is actuated in a synchronized manner with a cab tilt cylinder to elevate the cab, pushes to open the front grille lower part when the cab is elevated, and pulles to close the front grille lower part when the cab is lowered is provided between the front grille upper part and the front grille lower part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a front grill of a cab over truck.

[0002]

2. Description of the Related Art The cab of a truck has a cab-over type in which the cab is located above the engine, a bonnet type in which the cab is located behind the bonnet, and a crane vehicle because of the relative positional relationship between the cab and the engine. The driver's cab is classified as a one-sided type that is located next to the engine.The cab-over type is mainly a fixed cab type in which the driver's cab is fixed to the chassis frame and a hinge at the lower front of the cab. There is a tilt cab type in which the entire cab can rotate forward. The fixed cab type is often used in small trucks, and the tilt cab type is often used in large trucks.

In the tilt cab type, as shown in FIGS. 1 and 2, an upper cab suspension bracket 3 is rotatably supported by a pin 4 on a lower cab hinge bracket 2 vertically provided at a front end of a frame 1, and the upper cab suspension is concerned. The lower front end of the main shell 6 of the cab 5 is fixed to the bracket 3 and is rotatably supported forward. A cavitating cylinder 7 is interposed between the frame 1 and the main shell 6, and the cab 5 is rotated forward by extending the cavitating cylinder 7 from the state of the solid line in FIG. 1 as shown by a chain double-dashed line. Is ready to go. A front grille 8 is provided at the lower front portion of the cab 5, headlamps 9 are provided on both left and right sides of the front grille 8, and a bumper 10 is provided at the front end of the frame 1 and below the front grille 8. Is provided.

[0004]

By the way, the standards of vehicles are specified in detail for each country, and in a large cab-oper truck, in order to meet the market needs, it is necessary to make the laws and regulations of each country consistent. For example, in order to comply with the European regulations (EEC) for the ground clearance of the headlamp of a large cab over truck, the top clearance of the headlamp 9 needs to be 1200 mm or less as shown in FIG. It becomes lower than the current mounting position shown, and the lower end 8a of the front grill 8 inevitably lowers.
Therefore, when the cavit is carried out with such a structure, the lower end 8a of the front grille 8 is lowered from the current state,
Moreover, when it rotates, it is located behind the vehicle and interferes with the frame 1.

In order to avoid such interference, the current frame 1 having the shape of the frame 1'shown by a two-dot chain line as shown in FIG.
It is necessary to drastically change the shape as shown by the solid line and further attach the lower cab hinge bracket 2 by inclining it forward. However, when the lower cab hinge bracket 2 is tilted forward, the center of the cab (the center of the pin 4) and the mounting center L of the lower cab hinge bracket 2 deviate from each other by a distance Δ to become an offset state (offset distance Δ), and this offset distance Δ Becomes larger, the strength of the lower cab hinge bracket 2 needs to be increased, and the weight increases. Furthermore, if the shape of the frame 1 is significantly changed, it becomes impossible to use common parts, which causes a problem of cost increase.

The present invention has been made in view of the above-mentioned points, and a cab overtrack capable of coping with a headlamp having a lowered ground clearance without changing the structure of the frame and the lower cab hinge bracket. The purpose is to provide a front grill.

[0007]

In order to achieve the above object, according to the present invention, there is provided a front grille of a cab-over truck of a type in which head lamps are attached to lower portions on the left and right sides of the cab, which are disposed on the lower portion of the front of the cab. The front grill is divided into an upper part and a lower part, the upper part of the front grill being fixed to the cab, and the lower part of the front grill being rotatably attached to the upper part of the front grill via a hinge. A cylinder is provided between the upper part and the lower part of the front grill, which operates in synchronization with a cabultyl cylinder that lifts the cab, pushes the lower part of the front grill forward when the cab rises, and closes the lower part of the front grill when the cab descends. It has a different structure.

[0008]

When the cab rises, the lower part of the front grille is pushed forward by the cylinder as the cab rises and opens, and escapes forward from the frame of the vehicle body. This prevents the lower part of the front grille from interfering with the vehicle body frame during the cavitating, even if the ground clearance of the headlamp attached to the front grille is lowered.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the accompanying drawings. The same members as those in FIGS. 1 and 2 are designated by the same reference numerals. 5 and 6, the front grill 11
Is divided into, for example, a front grille upper portion 11a and a front grille lower portion 11b at a position near the upper edge of the headlamp, and head wraps 9, 9 are integrally attached to both left and right sides of the front grille lower portion 11b. ing. The lower part of the front grill 11b has an upper end attached to the lower end of the upper part 11a of the front grill by a hinge 12.
In addition, as shown by a chain double-dashed line, it can be rotated forward.
The front grill lower portion 11b is attached to the front grill upper portion 11a at a plurality of positions. Of course, the hinge 12 is attached to the back side of the front grill 11. Further, the headlamps 9 and 9 are mounted at a predetermined height, for example, 1200 mm or less, which is the upper edge mounting height from the ground surface.

A bracket 1 having a substantially crank shape as shown in FIGS. 6 and 7 is provided on the lower end of the rear surface of the upper portion 11a of the front grill.
3 has an upper end 13a fixed, and the bracket 13
The central portion 13c of the hinge 12 substantially hangs behind the hinge 12 with a slight gap, and the lower end 13c is bent obliquely rearward. The cylinder 14 for opening and closing the front grill has a cylinder barrel fixed to a lower end 13c of a bracket 13, and a tip of a rod rotatably connected to an upper end of a lower part 11b of the front grill together with the hinge 12.
When the cylinder 14 is shortened, the lower front grille 11b is held at the position shown by the solid line in FIG. 6 so as to be flush with the upper front grille 11a, and as it extends, the lower front grille 11b is pushed forward to open. At the maximum extension position, the upper part of the front grill 11a is pushed out and opened so as to form a right angle.

On the other hand, as shown in FIG. 8, a lower cab hinge bracket 2 is vertically provided at the front end of the frame 1, and an upper cab suspension bracket 3 is attached to the lower cab hinge bracket 2 by a pin 4 as shown in FIG. The upper cab suspension bracket 3 is rotatably supported, and the lower front end of the main shell 6 of the cab 5 is fixed to the upper cab suspension bracket 3 and rotatably supported forward. Therefore, the offset between the center of the cab and the mounting center of the lower cab hinge bracket 2 is zero. Also, frame 1
The cab cylinder 7 is interposed between the main shell 6 and the cab 5.
It is possible to rotate forward by extending.

FIG. 10 shows a hydraulic circuit for controlling the cavitating cylinder 7 and the front grill opening / closing cylinder 14. Ports 7a, 7 of the cavitating cylinder 7 are shown in FIG.
b is connected to oil passages 30 and 31 via pilot operated check valves 16 and 17, respectively, and ports 14a and 14b of the front grill opening / closing cylinder 14 are connected to oil passages 30 and 31, respectively. That is, the front grill opening / closing cylinder 14 is connected in parallel to the cavitating cylinder 7. The oil passages 30 and 31 are connected to the control valve 1
8 is connected to the oil passages 32 and 33. Further, the pilot operated check valves 16 and 17 are adapted to be opened by the hydraulic pressures (control signals) supplied from the oil passages 31 and 30 on the opposite sides, respectively.

The electric pump 20 has a suction port connected to a tank 22 via a check valve 21 and a discharge port connected to a check valve 23.
Is connected to the oil passage 32 via the oil passage 33, and the oil passage 33 is connected to the tank 22.
It is connected to the. A relief valve 24 is connected between the oil passage 32 and a downstream side of the check valve 23 (control valve 18 side) and the oil passage 33. The motor of the electric pump 20 has a + terminal connected to an electric circuit (not shown),
-The terminal is grounded. Further, this electric circuit is provided with a switch SW for on / off controlling the electric pump 20. The control valve 18 is a manual valve, and has switching positions 18A, 18B and a neutral position 18C.
Position 18A is for raising the cab and opening the lower front grille 11b, and position 18B is lowering the cab and closing position for the lower front grille 11b, position 18C.
Is in a neutral position.

The operation will be described below. In FIG. 10, when the switch SW is turned on, the electric pump 20 operates to generate hydraulic pressure and supply it to the oil passage 32. The oil pressure in the oil passage 32 is adjusted to a predetermined oil pressure by the relief valve 24 and supplied to the oil passage 31 through the control valve 18.
The oil pressure in the oil passage 31 is supplied to the port 7b of the tilt cylinder 7 through the pilot operation check valve 17 and the pilot operation check valve 16 is opened. Therefore,
In the tilt cylinder 7, the hydraulic pressure is supplied to the oil chamber on the right side, and the oil on the left side is operated by the pilot operation check valve 16 and the oil passage 3.
0, the control valve 18, and the oil passage 33 flow to the tank 22 and are pushed leftward in the drawing to shorten the main shell 6 of the cab 5 (FIG. 9).

The oil pressure in the oil passage 31 is also supplied to the port 14b of the front grill opening / closing cylinder 14 at the same time, and the front grill opening / closing cylinder 14 is pushed to the left in the figure to be shortened, so that the lower portion of the front grill 14 is lowered. 14b is held at the position indicated by the solid line in FIGS. 6 and 9. That is, when the control valve 18 is switched to the position 18B, the cab 5 descends and the lower part 11b of the front grille is retracted and closed to be flush with the upper part 11a of the front grille. And the vehicle is
It is ready to run.

Now, the control valve 18 is at the position 18
When switched to A, the oil pressure in the oil passage 32 is supplied from the control valve 18 to the oil passage 30 and is supplied to the port 7a of the tilt cylinder 7 through the pilot operation check valve 16 and the pilot operation check valve 17. Open the valve. As a result, the tilt cylinder 7 is pushed rightward in the drawing to extend, and pushes up the main shell 6 (FIG. 9) of the cab 5. The oil pressure of the oil passage 30 is also supplied to the port 14a of the front grill opening / closing cylinder 14 at the same time, and the cylinder 14 is pushed rightward in the drawing to extend, so that the lower portion of the front grill 11b (FIG. 6) is expanded. Pushed forward.

The tilt cylinder 7 and the front grill opening / closing cylinder 14 are driven in synchronism with each other, so that the cab 5 rises as shown in FIG.
1b is opened while being pushed forward. Then, when the cab 5 is raised to the uppermost position indicated by the chain double-dashed line 5'and leans forward, the front grille lower portion 11b is moved to the bumper 1
The front end of the frame 1 and the lower cab hinge bracket 2 are prevented from interfering with each other.

[0018]

As described above, according to the present invention, in the front grill of the cab over truck of the type in which head lamps are attached to the lower left and right sides of the cab over truck, the front grill is moved up and down. A front grill upper part fixed to the cab, and a front grill lower part rotatably attached to the front grill upper part through a hinge so that the front grill upper part and the front grill lower part are divided into two parts. By providing a cylinder that operates in synchronism with the cab cylinder for raising the cab, pushes the front grill lower part forward when the cab rises, and closes the front grill lower part when the cab descends. , Even for the specifications that lowered the ground clearance of the headlamp, Without changing the structure of the frame,
Moreover, it is possible to prevent the front grille from interfering with the frame and the lower cab elbow bracket when the cab is raised without using the lower cab hinge bracket as an offset structure, and as a result, it is possible to make the frame versatile. The cost can be reduced. Further, since the cab hinge bracket can be hung vertically with respect to the frame, an offset between the center of the cab hinge and the mounting center of the cab hinge bracket can be eliminated, and an increase in weight of the cab hinge bracket can be suppressed. Further, there are excellent effects such as a simple structure.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a conventional cab lifting mechanism for a cab overtrack.

FIG. 2 is a front view of the cab of FIG.

FIG. 3 is a cab front view of the cab overtrack when the ground clearance of the head wrap attached to the front grill is lowered.

4 is a configuration diagram of a cab lifting mechanism of FIG.

FIG. 5 is a cab front view of a cab overtrack to which the present invention has been applied.

FIG. 6 is a diagram showing an opening / closing mechanism of the front grill and the lower part of the front grill of FIG.

7 is an enlarged view of a hinge portion of FIG.

FIG. 8 is a diagram showing the relationship between the raising of the cab of FIG. 5 and the opening of the front grill.

FIG. 9 is a configuration diagram of a cab raising / lowering and front grille opening / closing mechanism according to the present invention.

FIG. 10 is a circuit diagram showing an embodiment of the hydraulic circuit of FIG.

[Explanation of symbols]

 1 Frame 2, 3 Cab Hinge Bracket 5 Cab 7 Tilt Cylinder 9 Headlamp 11 Front Grill 11a Front Grill Upper 11b Front Grill Lower 12 Hinge 14 Front Grill Open / Close Cylinder 16, 17 Pilot Operated Check Valve 18 Control Valve 20 Electric Pump

Claims (1)

[Claims] 1. A front grille of a cab over truck of a type in which head lamps are attached to lower left and right sides of a cab over front of a cab over truck, and the front grille is vertically divided into two and fixed to the cab. A cavitated cylinder configured by an upper part of the front grill and a lower part of the front grill rotatably attached to the upper part of the front grill via a hinge, and raising the cab between the upper part of the front grill and the lower part of the front grill. Operates synchronously and pushes the lower part of the front grill forward when the cab rises,
A front grill for a cab over truck, comprising a cylinder for closing a lower portion of the front grill when the cab is lowered.