JPS5856974A - Cabin tilting device - Google Patents

Abstract

PURPOSE:To aim at keeping a comfortable ride in a cabin unimpaired, by setting up a coupling mechanism interposingly in a tilt cylinder providing a tilting motion for the cabin of cab-over engine cars, etc., while making the cylinder releasable in time of nonrequirement. CONSTITUTION:A coupling mechanism consisting of a coupling ring 20, a coupling bracket 22, etc., is interposingly set up between a cabin 4 and a tilt cylinder 16, and this coupling mechanism is released as the cabin 4 requires no tilting motion. When the cabin 4 is tilted, a rod 19 is pressed out through the cylinder 16. If so, the ring 20 is received into a concave part 23 of the bracket 22, a switch 27 operates, a coupling pin 24 is inserted into a through hole 25 of the ring 20 and the bracket 22, the rod 19 and the bracket 22 are automatically coupled together, and the cabin 4 is tilted forward as centering on a fulcrum 10.

Description

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

Generally, in large vehicles such as trucks, the chassis and wheels are connected via hard springs. Therefore, compared to a passenger car, the driving vibration is greater and the riding comfort is worse. 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 cab-over vehicles, it is often necessary to tilt the cabin in order to maintain the engine, etc., and the cabin and 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 conventionally proposed lost motion mechanisms, sliding resistance always exists due to sliding resistance between the piston and cylinder and sealing between the piston and cylinder, and the spring constant of the suspension spring for the cabin. Since the tilting hydraulic cylinder is small, the tilting hydraulic cylinder has the drawback of deteriorating 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 drawback in that it is disadvantageous in terms of cost.

The present invention has been made with the aim of overcoming such problems.When the cabin is not tilted, the power cylinder is disconnected from the cabin, and when the cabin is tilted, the power cylinder is first activated to connect the piston. When the rod is moved and the piston rod reaches a position where it can be connected to the cabin, the detecting means detects this, and in synchronization with this detection, the actuator causes the connecting means to connect the cylinder rod and the cabin. . Therefore, according to the present invention, when the vehicle is not tilted, the connection between the cabin and the cylinder is released, thereby preventing deterioration of riding comfort. Furthermore, since the cylinder rod and the cabin are securely connected during tilting, safety is also excellent.

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, and wheels 3 are attached to a chassis frame 1 via leaf springs 2. As shown in FIG. A driver's cab 4 is mounted on the chassis frame 1 at its front end. This cabin 4 is supported by the chassis frame 1 by a pair of suspensions 5 provided on the left and right sides, respectively, on the front side and the rear side. Each suspension 5 is made up 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. A lever 9 is connected to the tip of the bracket 8 so as 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 rubber spring support ff1l. frame 1
An arm 13 is fixed to the arm 2, and the shock absorber 7 is interposed between the pin 10 and a pin 14 implanted in the arm 13. Furthermore, arm 1
3 and the lever 9 are connected via a pin 15.

The suspension 5 on the left side of the front part is constituted by this horizontal shock absorber buff and the coil spring 6 mentioned above.

A hydraulic cylinder 16 for tilting the gear pin 4 is attached to a bracket 1 whose base end is fixed to the chassis frame l.
7 via a pin 18. The piston rod 19 of the cylinder 16 projects from the tip of the cylinder 16 and is provided with a coupling ring 20 at the tip. Further, this ring 20 is provided with a projecting piece 21 protruding from its tip. A coupling bracket 22 is attached to the arm 13 with bolts in correspondence with the rod 19. The bracket 22 is formed with four parts 23 for receiving the ring 20 of the rod 19. A pin hole 25 through which a coupling pin 24 (see FIG. 4) passes is provided in the bracket 22 so as to traverse the recess 23. Further, a slit 26 is formed in the bracket 22 in communication with the four parts 23, and a microswitch 27 is housed and held within this slit 26.

The connecting pin 24 is connected to a rod of an air actuator 28, as shown in FIG.

Note that the actuator 28 is supported by the arm 13 by support means not shown. Air actuator 28
is communicated with the air tank 29 via an air supply conduit 30. Note that this air tank 29 may also be used as an air supply tank for opening and closing a butterfly valve for a negative source brake, for example. A solenoid valve 31 is attached to the air supply conduit 30 to control the supply of air. This solenoid valve 31 is connected to the microswitch 27 via a power source 32 and a switch 33. Note that the power source 32 may also be used as a power source for driving the starter motor.

In the above configuration, when servicing the engine (not shown) in the lower part of the cabin 4, the cabin 4 is tilted. This operation first closes the switch 33 as shown in FIG. Then, an operation lever (not shown) is operated to supply oil to the hydraulic cylinder 16 shown in FIG. Then, the piston rod 19 is gradually pushed out, and the coupling ring 2° at the tip thereof is received in the recess 23 of the bracket 22.

Along with this, the protruding piece 21 of the ring 2o passes through the recess 23,
inserted into the slit 26, and the microswitch 2
Press the 7 operator. For this purpose, microswitch 2
7 is closed and current from power supply 32 is transferred to switch 33 .
27 to the solenoid valve 31, and the solenoid valve 31 is opened. Therefore, air is supplied from the tank 29 through the air supply conduit 3o to the air actuator 28, and the actuator 28 is operated to move the coupling pin 24 forward in the axial direction. For this purpose, the coupling bin 24 is connected to the coupling ring 2.
0 and the through hole 25 of the bracket 22, thereby connecting the rod 19 and the bracket 22. At this position, the pin 24 stops with its flange portion contacting the inner surface of the arm 13.

In this way, when the piston rod 1975 (7") reaches a position where it can be connected to the 5-butt 22, the rod 19
is connected to arm 1 via coupling bin 24 and bracket 22.
It will be combined with 3. And further cylinder 16
In order to continue to be supplied with oil, as shown in Figure 3,
The cabin frame 12 to which the arm 13 is attached is pushed up, and the cabin 4ij is rotated counterclockwise so as to be tilted forward about the fulcrum pin 1o. This therefore causes the cabin 4 to be tilted, exposing the engine located below and making it serviceable.

Next, when the maintenance of the engine etc. is completed and the cabin 4 is returned to its original state, the rod 19 is moved by the hydraulic cylinder 16.
pull it inside. Then, the cabin 4 gradually rotates clockwise about the pin 1o in FIG. 3. Then, as shown in Figure 2, the cabin 4 becomes almost horizontal,
Once the rear part of the cabin 4 is supported by the suspension 5, the switch 33 is opened as shown in FIG. This closes the solenoid valve 31, cutting off the supply of air to the actuator 28, and the return spring built into the actuator 28 pulls out the coupling bottle 24 via the rod. Thereafter, by further retracting the rod 19 using the hydraulic cylinder 16 as shown in FIG. 2, the rod 19 is completely separated from the bracket 23.

According to this embodiment, in the non-tilt state, the hydraulic cylinder 16 is completely separated from the cabin 4, so that the cylinder 16 does not reduce the action of the suspension 5 of the cabin 4, and is therefore able to maintain a good condition. Riding comfort can be ensured. Further, there is no need to use a cylinder equipped with a lost motion mechanism as the cylinder 16, and the tilting device can be constructed at low cost, which is economically advantageous. Furthermore, in the tilted state, the cabin 4 and the cylinder 16 are reliably coupled via the coupling pin 24, so that a highly safe tilting device can be provided.

The device of this embodiment is equipped with an auxiliary pin having the same shape as the coupling bin 24, so that if a failure occurs in the drive mechanism of the coupling bin 24, the bracket 22 and the rod 19 can be manually coupled. It looks like this.

As described above, according to the present invention, the cabin and the power cylinder for tilting are completely separated in the non-tilting state, so that the riding comfort of the cabin is not impaired. Moreover, in the case of a tilting operation, the cabin is reliably connected to the rod of the cylinder by means of the connecting means, so that safety is not compromised.

Furthermore, there is no need to use a special cylinder with a lost motion mechanism, which is economically advantageous.

[Brief explanation of drawings]

FIG. 1 is a side view of essential parts schematically showing 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. 3 is a side view similar to FIG. 2 in a tilted state. Figure 4 is a block diagram of the actuator drive circuit,
FIG. 5 is a block diagram similar to FIG. 4 in a coupled state. In addition, in the symbols used in the drawings, 1... Chassis frame, 4... Driver's cab, 5... Suspension, 6... Coil spring, 7... Shock absorber, 16... Hydraulic cylinder. 19... Piston rod, 20... Coupling ring, 22... Coupling bracket, 24... Coupling bottle, 27... Micro switch, 28... Air actuator. Applicant Hino Motors Co., Ltd.

Claims (1)

[Claims] In an automobile in which a cabin is elastically supported on a chassis, a power cylinder for tilting the cabin with respect to the chassis, a detection means for detecting the position of a rod of the power cylinder, and a coupling of the rod to the cabin. and an actuator that drives the coupling means to a coupling position, and when the rod is moved by the power cylinder and reaches a position where it can be engaged with the coupling means, the detection means detects this. A cabin tilt device, characterized in that the actuator causes the coupling means to couple the rod and the cabin.