JPH0434150Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an air suspension device that elastically supports the cab of a tail-cab automobile using air pressure.

(Prior Art) Recently, an air suspension device has been proposed that elastically supports the cab of a tail-cab automobile using air pressure (see, for example, British Patent No. 1483967 and Japanese Patent Application Laid-open No. 158169/1983). This type of air suspension device consists of front and rear air bellows that are attached to the chassis frame and elastically support the cab, and front and rear leveling valves that are installed between the front and rear air bellows and the air tank. The front and rear leveling valves each have a leveling lever that responds to the upper surface of the front and rear air bellows. These front and rear air bellows are deflected by the weight of the cab, and the amount of deflection is optimally controlled by a leveling valve. However, when the cab tilts from this state, the load on the rear air bellows is removed, so the air bellows extends to its limit, and the leveling valve attempts to exhaust air until the air in the air bellows runs out. Furthermore, since the load on the front air bellows increases, the air bellows contracts to its limit and the air pressure rises to its maximum pressure. On the other hand, if the cab tilts down from this tilted state,
The front air bellows expand rapidly, and the rear air bellows contract rapidly, consuming a large amount of time and air to return to their original state.

(Purpose of the invention) The purpose of the invention is to provide an air suspension device for a tilted cab, which does not require air to be supplied or discharged from the air bellows when the cab is tilted, and therefore allows the air bellows to act immediately when the cab is released. Our goal is to provide the following.

(Structure of the invention) The air suspension device for the tailed cab according to the invention is provided between front and rear air bellows that are attached to the frame of the car seat and elastically support the cab, and between the front and rear air bellows and the air tank. It consists of a front and rear leveling valve, and each of the front and rear leveling valves has a leveling lever that responds to the upper surface of the front and rear air bellows, but each is provided between the front and rear air bellows and the corresponding front and rear leveling valves. The vehicle further includes front and rear cut valves, and the front and rear cut valves are characterized by being composed of electromagnetic valves that are energized and closed in conjunction with the drive circuit of the tail motor of the cab.

With this configuration, when the cab is tilted, the cut valve closes and air is prevented from being supplied to the front air bellows, and air is prevented from being discharged from the rear air bellows, so when the cab is tilted down, the air bellows is immediately released. You can work and support Kyabu.

(Embodiment) An embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 schematically shows an air suspension device 10 for a tailed cab according to the present invention. A pair of front and rear air bellows 16, 18 are attached to the frame 12 and elastically support the cab 14, the front and rear air bellows 16, 18, and an air tank 20.
(See Fig. 4) The front and rear leveling valves 22, 24 are provided with leveling levers 22a, 24a that respond to the upper surfaces of the front and rear air bellows 16, 18, respectively. have. As shown in FIG. 2, the air bellows 16 and 18 have a rubber bound stopper 2 therein which abuts against the lower seat 26.
8, the lower seat 26 and the bound stopper 28
The stroke interval between is set. This lower seat and bound stopper are connected to the lower seat 2 shown in Fig. 3.
6A and the bound stopper 28A may be installed outside the air bellows 16, 18. In either case, as shown in FIGS. 2B and 3B, the bound stopper 28 on the front air bellows 16 side,
28A also serves as a stopper when cab 14 is tilted.

As can be seen particularly from FIGS. 1 and 4, the air suspension device 10 of the present invention has front and rear air bellows 16 and 18 provided between the front and rear air bellows 16 and corresponding front and rear leveling valves 22 and 24, respectively. It further includes cut valves 30 and 32. As shown in FIG. 5, these front and rear cut valves 30, 32 are composed of electromagnetic valves that are energized and closed in conjunction with a drive circuit 36 of a tail motor 34 of the cab. In the embodiment of FIG. 5, the tail motor drive circuit 36 is powered by a battery power supply 38.
A cab lock switch 40 and a tail switch 4 are provided in series between the
2, the cab lock switch 40 is closed when the cab is released, and the tail switch 42 is closed when the cab is tilted. Furthermore, because of this configuration, the drive circuit 36 does not drive the tail motor 34 unless the cab block is released even if the tail switch 42 is closed. The solenoid valves 30 and 3 are connected in parallel between the connection point between the cab lock switch 40 and the tail switch 42 of this drive circuit 36 and the battery power source 38, so that at least the cab lock is released and the cab is turned off. block switch 4
0 is closed, these electromagnetic valves are connected to the connection point between the tail switch 42 and the tail motor 34 and the battery power supply 3.
It may be connected between 8 and 8.

Therefore, when the cab lock is released to tilt the cab 14, the cab lock switch 40 of the drive circuit 36 of the tilt motor is closed, so that the cut valve 3, which is a solenoid valve, is closed.
0 and 32 are connected to the battery power supply 38 and closed, the front and rear air bellows 16 and 18 are cut off from the leveling valves 22 and 24. Therefore, even if the cab 14 is tilted, air is not supplied to the air bellows 16 or air is discharged from the air bellows 18, and the air bellows 1
The air in 6 and 18 is maintained as it is. Therefore, when the cab 14 is tilted down again, the cab is locked, and the cut valves 30 and 32 are opened.
The previous state is immediately restored again, and the cab 14 is supported by the air bellows 16,18.

(Effect of the invention) According to the invention, as described above, when the cab is tilted, the cut valve closes and air is prevented from being supplied to the front air bellows and air is prevented from being discharged from the rear bare bellows. When the cab is tilted down, the air bellows can work immediately to support the cab.Therefore, since it does not take time for the air bellows to restore, the cab can be supported reliably, and no wasted air is consumed. It is economical without any hassle.

[Brief explanation of the drawing]

Figure 1 is a schematic side view of the air suspension device for a tailed cab according to the present invention, Figures 2 A and B are enlarged cross-sectional views of the air bellows used in the present invention in different states, and Figures 3 A and B are respectively FIG. 2 is an enlarged sectional view of the modified example in different states, FIG. 4 is a system diagram of the air circuit used in the present invention, and FIG. 5 is a system diagram of the excitation circuit of the cut valve. 10... Tail cab air suspension device, 12... Seat frame, 14... Cab, 16, 18... Front and rear air bellows, 20,
22... Leveling valve, 20a, 22a...
Leveling lever, 26, 26A...lower seat, 2
8, 28A... Bound stopper, 30, 32...
...Cut valve, 34...Tailt cylinder, 3
6... Tail motor drive circuit, 38... Battery power supply, 40... Cab block switch, 42
...tailed switch.

Claims (1)

[Claims for Utility Model Registration] (1) Front and rear air bellows attached to the chassis frame and elastically supporting the cab, and front and rear leveling valves provided between the front and rear air bellows and the air tank. The front and rear leveling valves are respectively provided between the front and rear air bellows and corresponding front and rear leveling valves in a tail cab air suspension device having a leveling lever that responds to the upper surface of the front and rear air bellows. An air suspension device for a tailed cab, further comprising front and rear cut valves, the front and rear cut valves comprising electromagnetic valves that are energized and closed in conjunction with a drive circuit of a tailed motor of the cab. (2) The drive circuit for the tail motor includes a cab lock switch that is closed when the cab lock is released, and a tail switch, and the electromagnetic valve is connected to the drive circuit so as to be energized at least when the cab lock switch is closed. An air suspension device for a tilted cab according to claim 1, which has been registered as a utility model.