JPH081123Y2 - Vehicle height 2-step switching device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a vehicle of an air suspension vehicle having an air spring interposed between a wheel and a frame and having a leveling valve for sucking and exhausting air of the air spring. A high two-stage switching device.

[Prior Art] Such a device is known (see, for example, Japanese Utility Model Laid-Open No. 59-85707).

By the way, whether or not the vehicle height is raised and lowered to a two-step high position or a fixed position is conventionally determined by the contact points provided on the wheel side and the vehicle body side and the detection means for detecting the contact of these contact points. . Therefore, the number of parts is large and the structure is complicated.

Further, JP-A-59-134003 proposes a control unit having a timer circuit in order to reduce the starting torque of the compressor used in the vehicle height adjusting device. However, such a known technique cannot be applied to a fluid control system using a leveling valve.

Further, Japanese Utility Model Laid-Open No. 59-85707 discloses a vehicle height adjusting device for adjusting the vehicle height of an air suspension vehicle. However, the vehicle height cannot be detected by such a known technique.

[Problems to be solved] Therefore, an object of the present invention is to provide a simple structure while driving.
(EN) Provided is a vehicle height two-stage switching device capable of reliably positioning at a vehicle height position of two levels of height regardless of a stop.

[Means for Solving the Problems] According to the present invention, a vehicle height 2 of an air suspension vehicle having an air spring interposed between a wheel and a frame and having a leveling valve for sucking and exhausting air of the air spring is provided.
In the stage switching device, a leveling valve adjustment cylinder is provided that communicates with the air supply source through a magnetic valve that is opened and closed by the up / down changeover switch and is kept in that state even when the power is turned off. The circuit is provided with throttling means for throttling air, and the throttling means is constituted by an orifice provided in the air passage in the leveling valve, and an intake air circuit bypassing the leveling valve is provided, and the circuit is provided with a leveling valve downstream of the intake / exhaust air circuit. A relay valve that opens when the vehicle height rises due to a signal pressure through a magnetic valve that is opened and closed by an elevator changeover switch is installed, and a timer is provided in the electric circuit that connects the elevator changeover switch and the magnetic valve. is there.

[Description of Action and Effect] Therefore, when the up / down switch is turned up, the magnetic valve opens, the leveling valve adjustment cylinder extends, and the timer starts by the operation of the leveling. Then, the signal pressure acts on the relay valve to increase the vehicle height. In this way, the timer expires and the vehicle height rise is completed, but even if the vehicle height rise is not completed when the timer expires, the magnetic valve holds the state even if the power is turned off Because it is a type, air can flow to the air spring through the leveling valve and raise the vehicle height. When the lever leveling adjustment cylinder returns to the neutral position due to a change in vehicle height, the vehicle height stops increasing.

When descending, it does the opposite. In this way, even if the vehicle height is not completely raised when the timer expires and the leveling valve causes a time difference, the vehicle height can be raised without any trouble.

Further, since the throttle means is not provided when the vehicle height rises, and the throttle means is provided when the vehicle is traveling normally or when the vehicle height is lowered, the influence of its own weight is reduced and the vertical movement is smoothly performed.

As described above, according to the present invention, the signal to the magnetic valve is cut by the timer, the vehicle height position can be substantially determined regardless of whether the vehicle is running or stopped, and the final position can be determined by the leveling valve. .

Further, since the timer is only provided in the electric circuit connecting the up / down changeover switch and the magnetic valve, the number of parts is small and the structure is extremely simple.

Furthermore, since a lock type magnet valve is used, even if the power is cut off, the lever of the leveling valve is held in the raised or lowered position, and the air from the air spring is supplied or exhausted to raise or lower the vehicle height to the specified position. Can be made.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, air springs 1fl, 1fr and 1rl, 1rr are provided between the front wheel and rear wheel (not shown) and the frame.
(Hereinafter abbreviated as 1) is interposed. Air springs 1fl, 1fr are surge tank 2, magnetic valve V2, leveling valve 8, sub tank 5 through main piping Lf.
Also, it is connected to a main tank 7 which is an air supply source via a check valve 6. The intake pipe L1f, which branches from the downstream side of the sub tank 5 of the main pipe Lf and bypasses the leveling valve 8, is joined to the main pipe Lf at the downstream side of the magnetic valve V2 via the relay valve 4 and the check valve 3. There is. The signal pipe L2f branched from the downstream side of the magnetic valve V2 of the main circuit Lf is connected to the relay valve 4 via the orifice 10 and the magnetic valve V3. Further, the air passage in the leveling valve 8 is provided with an orifice (not shown) which is a throttle means.

On the other hand, the leveling valve adjusting cylinder 13 connected to the lever 12 of the leveling valve 8 is connected to the main tank 7 via the magnetic valve V1 by the adjusting pipe L3f. And magnetic valves V1, V2 and V3
Is connected to the contact point 17u of the up-and-down changeover switch 17 via the electric wire 15u via the timer 16, and the contact point 17d is connected to the magnetic valve V1 by the electric wire 15d.

The magnetic valve V1 communicates the upstream port a and the downstream port b of the pipe L3f when the contact 17u of the switch 17 is closed, that is, when the vehicle height rises, and when the contact 17d is closed, that is, the vehicle height lowers. At the time, the port b is communicated with the exhaust port c. The power is turned off in both states.
Even so, the lock type is used so as to hold the state.

The magnetic valve V2 connects the upstream port d of the pipe Lf to the downstream port e when the contact 17u of the switch 17 is opened.
When the contact 17u is closed, the upstream port d of the pipe Lf communicates with the pipe L2f side port f.

The magnetic valve V3 connects the upstream port g of the pipe L2f to the downstream port h when the contact 17u of the switch 17 is closed, and connects the port h to the exhaust port j when the contact 17u is opened. It is like this.

The relay valve 4 connects the upstream port 1 of the pipe L1f to the downstream port m when a signal pressure is applied to the pipe L2f side port k.

Further, the leveling valve adjusting cylinder 13 extends when the air is supplied and pushes up the lever 12 to make the leveling valve 8
The upstream side port n of the main pipe Lf is communicated with the downstream side port p, contracts when air is exhausted to pull down the lever 12, and the port p is communicated with the exhaust port q. Therefore, the main pipe Lf does not have a throttle when the vehicle height rises, and has a throttle when the vehicle runs normally and when the vehicle height falls. The leveling valve 8 is provided with a height control switch (not shown), which opens when the lever 12 is in the neutral position (horizontal state in the example shown) and closes when the lever 12 moves upwards. It is designed to start the timer 16.

Regarding the rear wheel side air springs 1rl and 1rr, the main pipe Lr, the intake pipe L1r, the signal pipe L2r, and the signal pipe L2r, except that the surge tank 2, the sub tank 5, and the check valve 6 on the front wheel side are omitted from the main pipe Lr. Adjustment pipe L3r
Is substantially the same as the front wheel side. Therefore, the following description will be given for the front wheel side, and duplicate description will be omitted. Although not shown, this device is provided with a pilot lamp that indicates neutral, high, and low vehicle heights, a warning lamp that indicates that the vehicle height is being adjusted in conjunction with the height control switch, and a main switch. .

 Next, the operation will be described mainly with reference to FIG.

The driver turns on the main switch (step S1),
The pilot lamp determines whether the vehicle height position is appropriate (step S2). In the case of NO, it is determined whether or not the up / down changeover switch 17 is to be up (step S3). If YES, the contact 17u of the up / down changeover switch 17 is closed. As a result, the ports a and b of the magnetic valve V1 communicate with each other to open the valve (step S4), and the leveling valve adjusting cylinder 13
Is extended (step S5), the lever of the leveling valve 8
Push 12 up to connect ports n and p (step S
6). Then, the height control switch is turned on by pushing up the lever 12 (step S7), and thereby the timer 16 is started (step S8), and the warning lamp is turned on to display that the vehicle height is rising (step S).
9). At this point, the ports n and p of the leveling valve 8 are already in communication, and the ports d and f of the magnetic valve V2 are already in communication.
Is in communication, ports g and h of magnetic valve V3 are in communication (step S10), signal pressure acts on port k of relay valve 4, ports l and m are in communication, and main pipe Lf is in a state without a throttle. And the vehicle height is being increased (step S11). Eventually, timer 16 expires (step S
12), the warning lamp goes out (step S1)
3). Then, when the vehicle height is completed (step S14), the lever 12 returns to the neutral position in conjunction with the vehicle height, the height control switch is turned off, and the communication between the ports n and p of the leveling valve 8 is cut off. The state of vehicle height is stopped (step S15). At this time, since the magnetic valve V1 is a lock type, the lever 12 is held in the pushed-up position even if the vehicle height has not been completely raised when the timer 16 expires. Therefore, the air flows from the main pipe Lf to the air spring 1 via the leveling valve 8 to raise the vehicle height. Then, due to changes in vehicle height, lever 12
When returns to the neutral position against the spring 13a of the leveling valve adjustment cylinder 13, the vehicle height stops increasing. In this way, even if the vehicle height is not completely raised when the timer 16 expires, the vehicle height can be raised without any trouble, although there is a slight time difference due to the leveling valve. Therefore, the contact 17d of the lift switch 17 is closed to close the magnetic valve V1.
The ports b and c are communicated with each other, the communication with the ports a and b is disconnected and the valve is closed (step S16), and the main pipe Lf is brought into a throttled state through the leveling valve 8 (step S22).
After shifting to normal running (step S23), the main switch is turned off (step S24).

If step S3 is NO, that is, the lifting switch
If the contact 17u of 17 is closed, the contact 17d is closed. As a result, the port b of the magnetic valve V3 and the exhaust port c communicate with each other to close the valve (step S17), the leveling valve adjusting cylinder 13 contracts (step S18), and the lever 12
Is raised to communicate the port p with the exhaust port q (step S19). As a result, the main pipe Lf becomes a throttled state, the air of the air spring is exhausted, and the vehicle height is lowered (step S20). Then, the lowering is completed, the lever 12 returns to the neutral position (step S21), and the process proceeds to step S22.

If step S2 is YES, that is, if the vehicle height is appropriate, the process proceeds to step S22. In this way, the vehicle height position can be positioned in two levels, high and low, with a simple structure in which only the timer 16 is provided.

[Effect of Device] As described above, the present invention has the following excellent effects.

(I) It is possible to provide a vehicle height two-stage switching device having a small number of parts and a simple structure only by providing a timer.

(Ii) The signal to the magnetic valve can be cut off by the timer, the vehicle height position can be almost determined regardless of whether the vehicle is running or stopped, and finally the vehicle height can be determined by the leveling valve.

(Iii) The vehicle height can be increased even if the vehicle height is not completely raised when the timer expires.

(Iv) Since the throttle means is provided when the vehicle height rises and does not act during normal traveling or vehicle descent, the vertical movement is smooth.

(V) Due to the lock type magnetic valve, the air in the air spring can be sucked and exhausted even when the power is turned off to raise or lower the vehicle height.

[Brief description of drawings]

FIG. 1 is a piping diagram showing an embodiment of the present invention, and FIG. 2 is an operation flowchart. V1, V2, V3, V4, V5 …… Magnetic valve, 1 …… Air spring, 8,8A …… Leveling valve, 12 …… Lever, 13 …… Leveling valve adjustment cylinder, 15u ……
Electric wiring, 16 …… timer, 17 …… up / down selector switch

Claims (1)

[Scope of utility model registration request] In a vehicle height two-stage switching device for an air suspension vehicle having an air spring interposed between a wheel and a frame and equipped with a leveling valve for sucking and exhausting the air of the air spring, it is opened / closed by an elevation switch. A leveling valve adjustment cylinder that communicates with the air supply source through a magnetic valve that is held in that state even when the power is turned off is provided, and throttle means that throttles air is provided in the air circuit that sucks and exhausts air from the air spring. The means is composed of an orifice provided in the air passage in the leveling valve, an intake air circuit that bypasses the leveling valve is provided, and the circuit is provided on the downstream side of the leveling valve of the intake / exhaust air circuit and is opened / closed by a lift changeover switch. The relay valve that opens when the vehicle height rises due to the signal pressure through the tick valve is installed. Height 2-step switching device, characterized in that a timer to an electric circuit for connecting the magnetic valve and the lift change-over switch.