JPS60139513A - Kneeling device of air suspension car - Google Patents

Abstract

PURPOSE:To automatically adjust car height depending on a change in the number of passengers and maintain a car in the optimum car height by leveling-adjusting a bellows at the side where no kneeling is performed even at the time kneeling. CONSTITUTION:A kneeling device 10 consists of cut valves 24 and 26 provided between bellows 12 and 14 on the left side of car where an elevation step for an air suspension car is available and exhaust means 28 and 30. The exhaust means 28 and 30 consist of electromagnetic exhaust valves 38 and 40 that branch from the points between the valves 24 and 26 and the bellows 12 and 14 and are connected to those points and an electromagnetic restoration valve 52 is provided at the valve 38. The valve 52 is put in connection, in order to release kneeling before valves 34 and 36 are put in connection after switches 42 and 44 are opened, so as to supply air to the bellows 14 and expend the bellows 14. Car height is adjusted by setting the bellows 12 and 12' to the same height through the valves 20 and 22.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a kneeling device for an air suspension, such as a large bus, which has front, rear, left and right bellows that supply air at a predetermined pressure between the wheels and the frame.

For air suspension, there is a leveling valve installed between the air co-supply source and the left and right bellows at the rear of 111.
This leveling valve opens when the vehicle height becomes lower than a predetermined height to maintain a predetermined height. on the other hand,
Recently, a kneeling device has been proposed that removes air from the bellows when a heavy vehicle is stopped and lowers the steps for raising and lowering passengers to make it easier for passengers to ascend and descend.
If the air is removed from the bellows on both the left and right sides, it is necessary to supply air to both the left and right bellows during restoration, resulting in a large amount of air consumption (uneconomical).For this reason, only the bellows on the side with the lifting step is needed. Let's let the air out.

Air consumption has been cut in half, which is great. However, in such a kneeling device, if a force/soft valve is provided on the bellows side to prevent the bellows from operating during kneeling, the load applied to the bellows on the non-kneeling side depending on the number of passengers during kneeling. Since the air 4,< is constant even though the air changes, the bellows expands and contracts, causing the height of the car body to fluctuate, making the insect body unstable.

The object of the present invention is to provide an air suspension system that can perform kneeling with an air consumption of 6.6 mm, and that also allows the bellows on the non-knealing side to be adjusted even during kneeling. Embodiments of the present invention will be described in detail with reference to the drawings. Figure 9 shows a kneeling device for the air spring according to the present invention, l*
, the two-ring device 10 is shown, and the air suspension 5 and 4 are shown.
i is the front part for the air spring sunk between the frame (not shown) and +iii rear left and right wheels]3. Right bellows 12.12' and rear, right bellows 14.14'
and these bellows J2.12'Shinhi14,1
4°C14゛Batch'XNo:) Air is supplied from the air supply source 16.18 via a well-known leveling valve 20.22 which opens and closes depending on the height. The air is removed through this process to maintain a predetermined mid-height of the vehicle.

The kneeling device 10 of the present invention includes a kneeling bellows (12.14) and a leveling valve (2) on the side of the lift/lower step 41 of an air suspension vehicle, that is, on the side.
Cant help 2 provided between 0.22 and 0.22 respectively.
Exhaust the air from Rose 12.14 to 4.26 and Kneeling! j('p+, 7'-+3ν28.30. The cant valve 24.26 is 2-
Link bellows 12.14 only leveling valve 20
Bellows 12' and 14' are provided with a leveling of 1 <) rev 20.2 because they are designed to be cut off from 22 degrees.
2 controls the vehicle height. still.

In the drawing, row X432 represents a surge tank connected to the rear base 14.

24.26 is the control port 24a, 26a which is supplied with control air from the air supply s18°18 through the electromagnetic control/help 34.36.
, Control valves 34 and 36 are normally cut..., Lube 2
When energized, the control boats 24a and 26a are cut off from the air supply source 16.18, and this control air is released to the atmosphere to supply control air to the car 1. Shut off knobs 24 and 26.

1" 1 1 - [1 28.30 is a car, between the valve 24° 26 and the kneeling bellows 12.14! These electromagnetic valves 38, 40 are connected to a kneeling switch 42,44 and a kneeling sensor 46.
48 and are respectively connected to a power source 50. The kneeling sensors 46 and 48 are normally closed, but are in the form of vehicle height sensors that open when the two-ring bellows 12, 14 exhaust the air amount necessary for kneeling and the bellows height decreases to a predetermined value. . Therefore, when the kneeling switch 42.44 is closed, the ``electromagnetic exhaust valve 38.40
When the kneeling bellows 12.14 is energized and opened, the air in the kneeling bellows 12.14 is exhausted and kneeling is achieved, the kneeling sensor 46.48 is opened and the electromagnetic exhaust valve 38.4 is opened.
IA closes to 0 or more to stop wasteful exhaust of air
In the illustrated embodiment, an electromagnetic restoring valve 52 is provided in parallel with the exhaust valve 38, and this restoring valve 52 connects the air amount M[s to the kneeling bellows 12 to ni+, which the cant valve 24 communicates with. This restored pulp 52 is expanded by supplying air to the kneeling bellows 14 from the air supply [t16] after opening the kneeling switch 42.44 to release the kneeling and before the control/help 34.36 is connected. and left and right bellows 12.12'
is almost at the turning height. After that, the control valve 34.36 is closed to communicate the force and torque valves 24.26, and the height of the kneeling and lowering is adjusted as usual through the leveling valve 20.22, so that the slight height of the entire vehicle is adjusted. . If you want to get in and the rear car through one door, activate the kneeling bellows near that door, and if you want to get in and the rear car through separate front and rear doors on the left, exhaust air from the front and rear kneeling bellows on the left at the same time. , perform inhalation.

In this way, when the kneeling is released, air flows from the right bellows filled with air to the left kneeling bellows 12 where air is discharged, and the height of the right bellows decreases. This is advantageous because it can prevent the temporary decline of East 17I in the left and right bends.

In the above embodiment, the rear wheel side does not have a restoration pulp, but it goes without saying that a restoration valve may be provided in the same way as the front wheel side. Further, in the illustrated embodiment, the exhaust means is provided separately from the cut valve, but the cut valve itself may be provided with an exhaust port. Further, although the opening and closing of the force/sotopulp was controlled by control air, it may be of the tI11 type.

In the illustrated embodiment, the notches 42 and 44 are provided separately after the kneeling state, so that the front and rear can be individually kneaded.

According to the present invention, as shown in ), it is possible to perform kneeling simultaneously on the front and rear sides of the vehicle's lifting and lowering steps 1 and 1, so it is particularly suitable for cases where the lifting and lowering steps 1 are located at the front and rear. In addition, even when the kneeling bellows is in the kneeling state, the vehicle height of the other bellows is adjusted by the leveling valve, so the vehicle height is automatically adjusted according to changes in the number of passengers, and the interior of the vehicle is adjusted to the optimal vehicle height. can be maintained.

[Brief explanation of the drawing]

The drawing is a schematic system diagram of a two-ring device for an air suspension vehicle according to the present invention. 10----12-ring device, 12.12", 14.
14'--Bellows, 16.18--Air supply, 20.22--Leveling pulp, 24
．． 26-----Kanthelp, 24a, 26a--
--1 control port l-, 28, 30-1 --exhaust means,
34゜36---Control valve, 38.40---One to Sugi Iri 1 valve, 42, 44---Two-ring switch, 46, 48---Two-ring sensor . Patent applicant Hino Motors Co., Ltd.

Claims (3)

[Claims] (1) Left and right front wheel bellows for the air suspension, to which air is supplied via the front leveling valve from the air supply path, and left and right bellows for the air suspension, to which air is supplied via the rear leveling valve, which is also the air supply source. In an air suspension vehicle consisting of a rear wheel bellows, the front and rear cut valves are arranged between the front and rear leveling valves and the front and rear bellows (kneeling bellows) on the side having a step for raising and lowering, and the kneeling bellows No. 111. A kneeling device for an air suspension, comprising an exhaust means for exhausting air inside the suspension. (2) The exhaust means comprises an exhaust valve connected between the front and rear kneeling bellows and a corresponding cut valve, and the exhaust valve is closed by a kneeling sensor that opens below a predetermined bellows height of the corresponding kneeling bellows. A kneeling device for an air suspension vehicle according to claim 1. (3) The kneeling device for an air suspension vehicle according to claim 1 or 2, wherein the cut valve has a control port connected to the air supply source via a control valve.