JPS6135024B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automobile cabin tilting device, and more particularly to a cabin tilting device suitable for use in an automobile in which the cabin is elastically supported on a shaft by a coil spring or the like.

Generally, in large vehicles such as trucks,
The chassis and wheels are connected via hard springs. As a result, compared to passenger cars, driving vibrations are greater, making the ride less comfortable. Therefore, there is a problem in that driving such a large vehicle increases fatigue. In order to improve this problem, a truck has been proposed in which a coil spring or the like is further interposed between the chassis and the driver's cabin. However, in a cab-over vehicle, it is necessary to tilt the cabin for the purpose of maintaining the engine, etc., and the cabin and the chassis must be connected by a hydraulic cylinder or the like.

Generally, in a hydraulic cylinder, the piston becomes oil-locked when the oil flow stops, so to prevent this, a lost motion mechanism is required that allows the piston to move freely when the cabin is not tilted. become. However, in the lost motion mechanism proposed so far,
There is always sliding resistance between the piston and cylinder and the sealing member between the piston and cylinder, and the spring constant of the suspension spring for the cabin is small. The disadvantage was that the hydraulic cylinder deteriorated the riding comfort of the cabin. Furthermore, when a lost motion mechanism is provided, a general-purpose hydraulic cylinder cannot be used, and there is a disadvantage in terms of cost.

The present invention was made with the aim of overcoming such problems, and the rod of the tilting cylinder provided between the chassis and the cabin is connected to the cabin using an elongated hole and a pin. The cylinder is connected to allow idle movement, and a spring is provided in this cylinder to move the rod back, so that when the cabin completes its descent, the spring moves the rod back, so that the pin returns to the intermediate position of the elongated hole. This is what I did. Therefore, the cylinder does not interfere with the relative movement of the cabin with respect to the chassis, and unnecessary force is not applied to the cylinder during traveling.

The invention will now be explained with reference to the illustrated embodiments. FIG. 1 schematically shows the front part of the truck of this embodiment, in which wheels 3 are attached to a chassis frame 1 via leaf springs 2. As shown in FIG. A driver's cab cabin 4 is mounted on the chassis frame 1 at its front end. The cabin 4 is supported by the chassis frame 1 at the front and rear sides by suspensions 5, which are provided in pairs on the left and right, respectively. Each suspension 5 is composed of a coil spring 6 and a shock absorber 7.

Next, the tilting device for the cabin 4 will be explained with reference to FIG. 2. A bracket 8 is fixedly attached to the chassis frame 1 with bolts. And at the tip of this bracket 8 is a lever 9.
are connected to be rotatable about a pin 10.
The base end of this lever 9 constitutes a spring seat for the spring 6 of the suspension 5. The spring 6, whose lower end is supported on the lever 9, supports the frame 12 of the cabin 4 via a spring receiver 11 made of rubber. An arm 13 is fixed to the frame 12, and the shock absorber 7 is interposed between a pin 14 implanted in the arm 13 and the pin 10. Note that the arm 13 and the lever 9 are connected via a pin 15.
The shock absorber 7 and the coil spring 6 constitute a front left suspension 5.

Hydraulic cylinder 1 for tilting the cabin 4
6 is attached to a bracket 17 whose base end is fixed to the chassis frame 1 via a pin 18. The piston rod 19 of this cylinder 16 protrudes from the tip of the cylinder 16,
A coupling pin 20 is also provided at the tip. A coupling bracket 21 is connected to the piston rod 19.
is connected to the arm 13 with a bolt. The bracket 21 has an elongated hole 22 extending in the length direction of the rod 19 into which the coupling pin 20 is fitted. The cabin 4 is connected to the rod 19 by this elongated hole 22 and the connecting pin 20.

Next, the structure of the hydraulic cylinder 16 will be described with reference to FIG. 4. A spring case 23 is provided at the upper end of the cylinder 16, and is slidably fitted to the outer circumference of the cylinder 16. A compression coil spring 24 is interposed within this case 23. Further, a stop ring 25 for regulating the lowering position of the case 23 is provided on the outer periphery of the cylinder 16. Further, the rod 19 is provided with a stopper 26 that can come into contact with the upper end of the case 23.

Next, a pump 27 that supplies oil to the hydraulic cylinder 16 is driven by a motor 28, as shown in FIG. This motor 28 is connected to a power supply battery 30 via a relay switch 29. A coil 31 of the switch 29 is connected in series with a battery 30, a lock switch 32 of the cabin 4, a stopper switch 33, a thermal relay 34 of the motor 28, and an operation switch 35, and a buzzer 36 is connected in parallel with this coil 31. . The lock switch 32 is a switch that is closed when the lock between the cabin 4 and the chassis 1 is released to enable tilting, and the stop switch 33 is a safety stopper provided in the tilt mechanism (Fig. (not shown) is released. When the two switches 32 and 33 are both closed, a buzzer 36 emits an alarm. Further, the operation switch 35 is a switch that is operated when performing a tilting operation or a lowering operation.

In the above configuration, when performing a tilt operation, the cabin 4 is unlocked and the safety stopper is removed. Then, the switches 32 and 33 shown in FIG. 8 are both closed, and the buzzer 36 is turned on.
emits a warning sound to notify that a tilt operation is to be performed. When the operation switch 35 is pressed, the coil 31 is energized, the switch 29 is closed, and power is supplied to the motor 28. Pump 27 is thus driven by motor 28 and oil is supplied to cylinder 16. Then, the piston 19 is gradually pushed out and moved upward.

As shown in FIG.
0 is located approximately in the middle of the elongated hole 22 of the bracket 21 at the start of the tilt, but as the rod 19 moves, it moves within the elongated hole 22 as shown in FIG. 4, and eventually reaches the end of the elongated hole 22. come into contact with Therefore, from now on, the rod 19 pushes up the cabin 4 via the bracket 21 and the arm 13. For this purpose, the cabin 4 is rotated about the pin 10 as shown in FIG. 3, thereby performing a tilting operation.

Next, when lowering the cabin 4, switch the switching valve attached to the pump 27, and
Push the operation switch 35 to drive the motor 28,
Oil is supplied to the cylinder 16 from the pump 27. Then, the piston rod 19 is gradually retracted into the cylinder 16, and the cabin 4 is rotated and lowered from the state shown in FIG. 3 to the state shown in FIG. When the cabin 4 is lowered to a lockable position as shown in FIG. 2, the stopper 26 of the rod 19 comes into contact with the upper end of the case 23 as shown in FIG. Note that at this time, the pin 20 is in the middle position of the elongated hole 22 of the bracket 21. Thereafter, the rod 19 descends further, causing the stopper 26 to move the case 23 downward and compress the coil spring 24, as shown in FIG. Then, as shown in FIG. 6, the motor 28 is stopped at the position where the lower end of the case 23 comes into contact with the stopper ring 25 of the cylinder 16, and the retracting operation of the rod 19 is completed.

As a result, no downward pulling force acts on the rod 19, and since the compression coil spring 24 is pushing the rod 19 upward, the rod 19
9 now reverses upwards. That is, as shown in FIG. 7, in order for the coil spring 24 to press the stopper 26 upward through the case 23, the rod 19 returns to the position where the lower part of the case 23 comes into contact with the flange portion of the cap 37 of the cylinder 16. be moved. In this position, the coupling pin 20 is moved to a position approximately in the middle of the elongated hole 22 of the bracket 21.

As described above, according to this embodiment, when the lowering of the cabin 4 is completed, the pin 20 that connects the cabin 4 and the rod 19 of the cylinder 16 is located approximately in the middle of the elongated hole 20 of the bracket 21.
Therefore, the cabin 4 can move vertically relative to the chassis 1 by about half the total length of the elongated hole 22. Therefore, the action of the suspension 5 of the cabin 4, which is composed of the coil spring 6 and the shock absorber 7, is not inhibited, and a comfortable ride can be maintained. Also, the cabin 4 is the chassis 1.
Even when the cylinder 16 moves relative to the cylinder 16, unnecessary force is not exerted on the cylinder 16, and wear and tear on the cylinder 16 can be prevented. Furthermore, there is no need to use an expensive hydraulic cylinder with a lost motion mechanism.
It is also advantageous in terms of cost.

As described above, according to the present invention, the pin connecting the cabin and the rod of the power cylinder is returned to the intermediate position of the elongated hole when the cabin completes its descent. The cylinder does not obstruct this, and no unnecessary force is applied to the cylinder during driving.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view of the front part of a truck according to an embodiment of the present invention, FIG. 2 is a side view of the tilt mechanism of this truck, and FIG.
4 to 7 are longitudinal cross-sectional views of essential parts showing the operation of the tilt cylinder, and FIG. 8 is a drive circuit diagram of a hydraulic pump drive motor. In addition, in the symbols used in the drawings, 1... Chassis frame, 4... Cab cabin, 16... Hydraulic cylinder, 19... Piston rod, 20... Connection pin, 22... Elongated hole, 23... Case, 24...
. . . compression coil spring, 26 . . . stopper.

Claims (1)

[Claims] 1. In a device in which a cabin is tiltably supported on a chassis, a power cylinder is arranged between the cabin and the chassis, and the tilting operation is performed by this cylinder, the rod of the power cylinder is connected to a long hole and a pin. The power cylinder is connected to the cabin so as to be movable in idle motion, and the power cylinder is further provided with a spring for moving the rod back, and when the descent of the cabin is completed, the rod is moved back by the spring, A tilting device for an automobile cabin, characterized in that the pin returns to an intermediate position of the elongated hole.