JPH07110569B2 - Vehicle height maintenance device for air suspension vehicles - Google Patents

Description

The present invention relates to a vehicle height maintaining device for an air suspension vehicle.

[Conventional technology]

In trucks, tractors, etc. that have air suspension, the vehicle body is supported on the axle through multiple air springs, and the vehicle height can be adjusted up and down by supplying and discharging the air spring filling air as described below. In addition to facilitating cargo handling work, it is designed to reduce the shaking of the loading platform during traveling.

That is, in the system diagram of FIG. 5, when the main switch 01 is turned on, the current from the battery 02 excites the transmission neutral relay 03 to turn on the relay contact, so that the transmission neutral switch 04 The current flowing through excites the fuse relay 05 and turns on its contact, so that the voltage from the battery reaches the lift switch 06 via the contact.

To increase the vehicle height, switch the lift switch 06 to UP and the current will flow from the switch 06 to the magnet valve 09,0.
8 flows into the air tank 010 and the air in the air tank 010 is a magnet valve 09,08,
It is supplied to the air spring 011 via 07 and the vehicle height increases,
When raising / lowering switch 06 is switched to N, air supply is stopped.

To decrease the vehicle height, switch the elevator switch 06 to DWN, and the current will flow from the switch 06 to the magnet valve 08, which will turn "ON" and the air of the air spring 011 will be the magnet valve 07,08,09. After being discharged to the outside, the vehicle height decreases, and when the lifting switch 06 is returned to N, the vehicle height stops decreasing.

When traveling, when the main switch 01 is switched to "OFF", the magnet valves 09,08,07 are switched to "OFF" respectively, while the distance between the traveling leveling valve 012 and the axle 013 attached to the side frame. The leveling valve 012 is actuated by the rotation of its arm in response to the fluctuation of the air pressure, and when the vehicle height becomes lower than the reference vehicle height, the air is supplied to the pipes 014, 015,
When supplied to the air spring 011 via the leveling valve 012 and the magnet valve 07, and when the vehicle height increases from the reference vehicle height, the leveling valve 012 discharges air to automatically level the loading platform during traveling.

However, with such a structure, it is considerably complicated and costly, and the operator has to manually switch the up / down switch to UP, DWN by visually observing the height of the vehicle. If the elevator switch cannot be removed and is not adjusted frequently, the smooth and rapid operation of the forklift will be hindered due to the level difference between the platform and the platform.

[Problems to be Solved by the Invention]

The present invention has been proposed in view of such circumstances, and it is labor-saving and labor-saving that automatically keeps the vehicle height at a platform level (hereinafter referred to as a set level) in spite of a change in the load during loading and unloading. It is also an object of the present invention to provide a vehicle height maintaining device for an air suspension vehicle, which is intended to reduce costs.

[Means for Solving the Problems]

To this end, the present invention inserts a magnet valve and a traveling leveling valve into an air supply / discharge pipe system that connects an air tank and an air spring, and switches the magnet valve during loading / unloading to supply / discharge air from the air spring. By doing so, the loading platform is moved up and down, and when traveling, the leveling valve for traveling is linked to the variation of the loading platform-axle distance to supply and discharge air from the air spring to reduce rolling of the loading platform. In a vehicle, a cargo handling leveling valve that is inserted in the air supply / discharge pipe system in parallel with the traveling leveling valve to supply and discharge air from the air spring by switching during cargo handling and a valve rod of the cargo handling leveling valve With the provided manual lever,
A control arm that is projectingly provided on the valve rod through a clutch, has its tip pivotally attached to the axle through a link mechanism, and is always rotatable with respect to the valve rod, but is fixed to the valve rod by a vehicle height switch. It is characterized by having.

[Action]

During loading, when the main switch is switched to "ON", the air to the traveling leveling valve is cut off, and the leveling valve for loading is directly operated by the manual lever without operating UP / DWN of the lifting switch. Make a high adjustment.

When the vehicle height adjustment is completed, turn on the vehicle height switch to set the clutch to "fit", and the arm will be fixed to the spool shaft of the cargo handling leveling valve. As a result, the leveling valve for cargo handling is switched, and the vehicle height is automatically maintained at the set level despite the increase or decrease of the load amount.

In addition, by switching the main switch to “OFF” when traveling, the air from the air tank is disconnected from the cargo handling leveling valve, and this is led to the traveling leveling valve.
As before, the leveling valve for traveling, which is interlocked with rolling of the axle of the cargo bed, is interlocked to switch air to and from the air spring to prevent rolling.

〔Example〕

An embodiment in which the present invention is applied to a rear biaxial type truck will be described with reference to the drawings. FIG. 1 is an overall system diagram thereof, and FIG. 2 is a cross-sectional view of the truck showing a mounting procedure of a cargo handling leveling valve of FIG. Fig. 3, Fig. 3 is a partial plan view of Fig. 2, Fig. 4 is a partial arrow view along IV-IV of Fig. 3, and Fig. 5 is a first to a first diagram.
It is a general | schematic explanatory drawing which shows the effect | action of FIG.

In the above figure, the same reference numerals as those in FIG. 6 indicate the same members as those in FIG. 6, respectively. First, the portion shown by the bold line in FIG. 1 has changed the structure of FIG. The first port 6 and the second port 7 of the leveling valve 1 which will be described later are connected to the pipes 015 and 016 through the first pipe 2 and the second pipe 3, respectively, and the leveling valve 1 has a magnet clutch. The magnet clutch 10 is connected to the axle 013 via a link mechanism 14 as will be described later. Reference numeral 15 is a vehicle height switch which is a simplification of the lifting switch 06 shown in FIG. 6, and the magnet valves 08 and 09 shown in the same figure are omitted.

Next, in FIGS. 2 to 3, reference numeral 1 denotes a leveling valve which is disposed inside the side frame 2 and performs automatic leveling of a loading platform which is being loaded, which is substantially the same as the known leveling valve 012 shown in FIG. Have the same structure, but a horizontal lever 5-1 is provided on the spool shaft 5 in a protruding manner.
The tip of the lever 5-1 is connected to the vehicle height adjusting lever 5-3 via a push-pull cable 5-2. here,
When the spool shaft 5 is in the neutral position, the first port 6 and the second port 7 are blocked from the third port 8,
When the spool shaft 5 rotates to one side, the first port 6 communicates with the second port 7, and when the spool shaft 5 rotates to the other side, the first port 6 is closed and the second port 7 is connected to the third port 8.

Reference numeral 10 is a magnet clutch attached to the leveling valve 1 via a connecting member 9, and the clutch shaft 11 has an arm.
12 is projected substantially parallel to the axle 013, and the exciting coil 13
Is excited, the base end of the arm 12 is integrated with the spool shaft 5.

Reference numeral 14 denotes a link mechanism in which a turn bag is inserted, and upper and lower ends thereof are pivotally attached to the tip of the arm 12 and the upper end of the axle 013, respectively.

In such a device, automatic leveling of the vehicle height during loading and unloading is performed as follows.

That is, in FIG. 1, at the start of cargo handling work, the vehicle height adjusting lever 5-3 is operated to operate the push-pull cable 5
-2 and the lever 5-1 are used to rotate the spool shaft 5, so that the vehicle height is first adjusted to the same level as the platform.

During this adjustment, the magnet clutch 10 is in the "disengaged" state, the arm 12 is free, and when the adjustment is completed, the arm 12 is in the position shown by the chain line in FIG.

Therefore, when the vehicle height switch 15 is turned on after the initial adjustment of the vehicle height is completed, a current flows from the battery 02 to the exciting coil 13 of the magnet clutch, and the arm 12 thereof is fixed to the spool shaft 5 at the chain line position.

Here, since the spool shaft 5 of the leveling valve 1 is normally made to be in the neutral position, when the arm 12 'in the chain line position is fixed to the spool shaft by the action of the magnet clutch, the arm shown by the chain line is The position becomes the new neutral position of the leveling valve 1.

Therefore, when the vehicle height increases above the set level due to the decrease in the load, the leveling valve 1 links the air from the air spring in conjunction with the displacement of the arm 12 'from the new neutral position.
When the vehicle height is returned to the set level by discharging it to the outside through 016,3, the second port 7 and the third port 8, and the vehicle height becomes lower than the set level, the first port 6 and the second port 7 To connect the air in the air tank to the pipes 014,2,3
After that, it is supplied to the air spring and the vehicle height is automatically returned to the set level.

To summarize the operation described above with reference to Fig. 4, when the main switch 01 is switched to "ON" during cargo handling, the magnet valves 07 are switched to "ON", respectively, and the vehicle height is changed relative to the set vehicle height. Accordingly, the air in the tank flows as indicated by the broken line arrow by the action of the leveling valve 1, the air of the air spring 011 is supplied and discharged, and the vehicle height is automatically returned to the set level.

On the other hand, when traveling, when the main switch 01 is switched to "OFF", the magnet valves 07 are switched to "OFF" respectively, the leveling valve 1 is disconnected, and the air flows in the direction of the solid line arrow by the action of the leveling valve 012. It is possible to regulate the relative rolling of the loading platform while traveling.

According to such an apparatus, the lifting switch 06 and the magnet valves 08 and 09 are eliminated, so that the piping system and the wiring system are simplified, so that the cost can be reduced.

〔The invention's effect〕

In short, according to the present invention, the magnet valve and the traveling leveling valve are inserted into the air supply / discharge pipe system that connects the air tank and the air spring, and the magnet valve is switched during the cargo handling to supply the air from the air spring. By discharging, the loading platform is moved up and down, and when traveling, the leveling valve for traveling is linked to fluctuations in the distance between the loading platform and the axle to supply and discharge air from the air spring to reduce rolling of the loading platform. In the vehicle, the leveling valve for cargo handling, which is inserted in parallel with the traveling leveling valve in the air supply / discharging pipe system and supplies / discharges the air of the air spring by switching during cargo handling, and the valve rod of the leveling valve for cargo handling. The protruding manual lever and the valve rod are projected through the clutch and the tip of the valve lever is connected through the link mechanism. It has a control arm that is pivotally attached to the axle and is always rotatable with respect to the valve rod, but it has a control arm that is fixed to the valve rod by a vehicle height switch. The present invention is extremely useful industrially because a vehicle height maintaining device for an air suspension vehicle that automatically holds the vehicle to a platform level (hereinafter, referred to as a set level) is provided for labor saving, labor saving, and cost reduction. .

[Brief description of drawings]

FIG. 1 is an overall system diagram showing an embodiment in which the present invention is applied to a rear biaxial type truck, and FIG. 2 is a transverse cross-sectional view of the truck showing a mounting procedure of the cargo handling leveling valve of FIG. 1, and FIG. 2 is a partial plan view of FIG. 2, FIG. 4 is a partial arrow view along IV-IV of FIG. 3, and FIG. 5 is a general explanatory view showing the operation of FIGS. FIG. 6 is an overall system diagram showing an air suspension structure of a known rear biaxial type track. 1 …… Leveling valve (for cargo handling), 2 …… First piping,
3 ... second piping, 4 ... side frame, 5 ... spool shaft, 5-1 ... lever, 5-2 ... push-pull cable, 5-3 ... vehicle height adjusting lever, 6 ... 1 port,
7 ... 2nd port, 8 ... 3rd port, 9 ... Connecting member, 10 ... Magnet clutch, 11 ... Clutch shaft, 1
2, 12 '... Arm, 13 ... Excitation coil, 14 ... Link mechanism, 15 ... Vehicle height switch, 01 ... Main switch, 02 ...
… Battery, 03 …… Transmission new neutral relay, 04 …… Transmission new neutral switch, 05 …… Huse relay, 06 …… Lift switch, 07…
… Magnet valve, 08,09 …… Magnet valve, 010
...... Air tank, 011 ...... Air spring, 012 ...... Leveling valve (for traveling), 013 ...... Axle, 014,015,0
16 …… Piping.

Claims (1)

[Claims] 1. A magnet valve and a traveling leveling valve are inserted into an air supply / exhaust pipe system connecting an air tank and an air spring, and the magnet valve is switched during loading / unloading to supply / exhaust air from the air spring. A vehicle in which the loading platform is moved up and down, and the running leveling valve is switched during traveling to supply and discharge air from the air spring in conjunction with the variation of the loading platform-axle distance to reduce rolling of the loading platform. In the above, in the air supply / discharge pipe system, the traveling leveling valve is inserted in parallel, and the cargo handling leveling valve that supplies and discharges the air of the air spring by switching at the time of cargo handling and the valve rod of the cargo handling leveling valve are projected. The lever for manual operation and the valve rod protruding from the clutch via a clutch, and the tip is pivoted to the axle via a link mechanism. By vehicle height holding device air suspension Chillon vehicle, characterized in that it comprises a control arm also Naru rotatably is fixed to the valve stem by the vehicle height switch against normally the valve rod.