KR200286409Y1 - Automotive pusher axle system - Google Patents

Abstract

The present invention relates to a vehicle pusher axle system for raising and lowering the auxiliary axle of a heavy vehicle having a plurality of axles in accordance with its tolerances and loading conditions so as to distribute the entire vehicle load on the ground uniformly. The system utilizes a three-stage switch to facilitate the supply and discharge of compressed air to the ride airbag, simplifying the elevating operation of the auxiliary axle, ensuring precise and stable operability, and extending its life. As the vehicle travels on an irregular road surface, there is a very excellent effect of effectively absorbing the vibration generated.

Description

Automotive pusher axle system {Automotive pusher axle system}

The present invention relates to a pusher axle system for a vehicle, and more particularly to a pusher axle system that is easy to operate, stable and precise operability is extended life.

In general, heavy vehicles, such as trucks for transporting cargo such as cargo, trailers, or special vehicles for performing special functions, etc., are very large in total, resulting in road breakage or bridge breakage during driving.

Therefore, roads or bridges with weak ground are controlled by marking the passing weight limit, and if the weight of the vehicle exceeds the passing limit, it is regulated not to operate the bridge or road.

Accordingly, heavy vehicles, such as vans and special vehicles, have a plurality of axles to evenly distribute the load of the entire vehicle on the ground. Any one of these axles (i.e., the auxiliary axle) is provided with a pusher axle system which controls the air bag to be lowered as the air bag is inflated or contracted by the compressed air, so that it is raised at the time of tolerance and lowered at the time of loading. .

This general pusher axle system selectively supplies and discharges compressed air to a lift assembly with lift and ride airbags, an auxiliary axle coupled to the lower side of the lift assembly, and a lift and ride airbag of the lift assembly. It consists of a pneumatic control circuit. In such a pusher axle system, as the driver manipulates an up-down switch disposed in the driver's seat, compressed air is selectively supplied to and discharged from the lift air bag of the elevating assembly to perform the raising and lowering operation of the auxiliary axle.

In addition, the air supply to the ride air bag described above is made by the driver manually adjusting the manual control valve disposed in the driver's seat to control the pressure and flow rate of the compressed air supplied thereto.

However, such a conventional pusher axle system has a problem that the operation is very cumbersome, precise and stable operability is not guaranteed as the operator must manually adjust the pressure and flow rate of the compressed air by the manual control valve.

The present invention was conceived in view of the above, by using a three-stage switch to facilitate the supply and discharge of compressed air to the ride air bag, the operation is simple, precise and stable operability is ensured life The purpose is to provide an extended pusher axle system.

Another object of the present invention is to provide a pusher axle system that effectively absorbs vibrations generated as a vehicle travels on an irregular road surface.

1 is a side view showing a lifting assembly of a vehicle pusher axle system of the present invention mounted on a vehicle body frame;

2 is a schematic view of the pneumatic and electrical circuit diagram of the vehicle pusher axle system of the present invention.

Figure 3a is a state diagram showing the operating state of the pneumatic and electrical circuit diagram when the lifting assembly and auxiliary axle of the vehicle pusher axle system of the present invention is raised.

Figure 3b is a state diagram showing the operating state of the pneumatic and electrical circuit diagram when the lifting assembly and auxiliary axle of the vehicle pusher axle system of the present invention is lowered.

Explanation of symbols on the main parts of the drawings

1: body frame 2: lift airbag

3: ride air bag 4: lifting and lowering assembly

5: shock absorber 6: auxiliary axle

7: auxiliary wheel 10: main tank

11: air tank 12: solenoid valve

13: 1st magnetic valve 14: 2nd magnetic valve

15: pressure compensation valve 16: pressure gauge

17: up-down switch 18: compressed air supply switch

20: supply pipe for lift 21: supply pipe for ride

22: pressure compensation piping

The present invention for achieving the above object, is provided on one side of the body frame, the elevating assembly having a lift and ride airbag; An auxiliary axle fixedly coupled to one side of the elevating assembly and elevating by an inflating and contracting action of the lift and ride airbags; In the vehicle pusher axle system consisting of a pneumatic control circuit for selectively supplying and discharging compressed air to the lift and ride air bags of the elevating assembly,

A main tank containing an air compressor; A plurality of air tanks for receiving compressed air from the main tank and supplying compressed air to the lift and ride air bags; A safety valve installed at one side of the ride airbag and discharging a part of the compressed air filled in the ride airbag according to the pressure in the ride airbag; Supplying compressed air to the lift supply pipe branched from one side of the plurality of air tanks, and supplying compressed air to the lift air bag connected to one output port, and supplementing the compressed air to the ride air bag side connected through the pressure compensation pipe to the other output port. A solenoid valve for selectively intermittent with; A pressure compensation valve installed on the pressure compensation pipe extending from the other output port of the solenoid valve to control the pressure and flow rate of the compressed air supplemented with the ride air bag; A first magnetic valve installed on a supply pipe for the ride branched to the other side of the plurality of air tanks to control the supply of compressed air to the ride air bag; A second magnetic valve connected to one side of each ride air bag to control discharge of compressed air filled in the ride air bag; A pressure gauge in communication with the ride airbag and disposed in the driver's seat to indicate pressure in the ride airbag; An up-down switch electrically connected to the solenoid valve and the second magnetic valve to selectively control the supply and discharge of compressed air to the lift airbag and the ride airbag to control the raising and lowering operation of the auxiliary axle; And a compressed air supply switch electrically connected to the first and second magnetic valves to control compressed air supply and discharge to the ride airbag.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 and 2 show a pusher axle system according to an embodiment of the present invention.

The elevating assembly 4 of the pusher axle system according to the present invention is provided with lift and ride airbags 2 and 3 at right angles to each other, and is installed on one side of the vehicle body frame 1. A shock absorber 5 is installed in the vertical direction between the lift and ride air springs 2 and 3 of the elevating assembly 4.

Here, the auxiliary axle 6 is coupled to the lower side of the elevating assembly 4, and the auxiliary wheels 7 are mounted on both left and right ends of the auxiliary axle 6.

On the other hand, the elevating assembly 4 of the pusher axle system of the present invention is not limited to the elevating assembly of the type shown in FIG. 1, and other various elevating assemblies well known in the art are applicable.

As shown in Figure 2, the configuration of the pneumatic and electric circuit of the vehicle pusher axle system of the present invention lifts the main tank 10 with the built-in air compressor and a predetermined amount of compressed air stored from the main tank 10. And a plurality of air tanks 11 supplied to the ride airbag side and a lift supply pipe 20 branched from the plurality of air tanks 11 to one side and connected to one output port. A solenoid valve 12 for selectively intermittently supplying compressed air to the lift airbag 2 and supplementing the compressed air to the ride airbag 3 side connected through the pressure compensation pipe 22 to the other output port, and a plurality of air On the first magnetic valve 13 and the one side of the ride air bag 3, which is installed on the supply pipe 21 for the ride branched to the other side of the tank 11, and controls the supply of compressed air to the ride air bag 3 side. Installed Ride Air (3) a safety valve 19 for discharging a part of the compressed air filled in accordance with the pressure in the outside, and a pressure compensation valve provided on the pressure compensation pipe 22 extending from the other output port of the solenoid valve 12 ( 15), a second magnetic valve 14 which is provided at the inlet side of each ride airbag 3 to discharge compressed air in the ride airbag 3 to the outside, and a pressure gauge connected to the ride airbag 3, 16) and an up-down switch electrically connected to the solenoid valve 12 and the second magnetic valve 14 to control the compressed air supply to the lift airbag 2 to control the lifting and lowering operation of the auxiliary axle 6 ( 17 and a compressed air supply switch 18 electrically connected to the first and second magnetic valves 13 and 14 to control the supply and discharge of compressed air to the ride airbag 3.

The main tank 16 incorporates an air compressor therein, and sucks and compresses external air, and then transfers the air to the plurality of air tanks 11 described later.

The plurality of air tanks 11 receive the compressed air from the main tank 16, and then supply the compressed air to each lift and ride airbags 2 and 3 if necessary.

On the other hand, on the pipe between the main tank 10 and the plurality of air tanks 11 may be equipped with check valves and on-off valves (10a, 10b) for preventing backflow.

The safety valve 19 is installed at one side of the ride airbag 3 and has an outlet for discharging a part of the compressed air in the ride airbag 3 to the outside so as to efficiently absorb the vibration generated when the vehicle runs on an irregular road surface. do.

The solenoid valve 12 is a 5-port / 2-way solenoid control valve having one input port, two output ports, and two exhaust ports, and is provided with a lift supply pipe 20 branched from one side of the plurality of air tanks 11. ) Is connected to the input port, the lift airbag (2) is connected to one output port thereof, the ride airbag (3) is communicated to the other output port via a pressure compensation pipe (22), and each exhaust port has a silencer (12a) ) Is mounted. When the solenoid valve 12 is in the non-excited state, the one output port to which the above-mentioned lift airbag 2 communicates is opened, and the other output port to which the above-described pressure compensation pipe 22 communicates is closed. do. On the contrary, when the solenoid valve 12 is excited, the above-described opening and closing operations of one side and the other side of the output port are reversed.

Accordingly, the solenoid valve 12 performs the main function of controlling the supply of compressed air to the lift airbag 2 according to the opening and closing operation of one output port, and closes the other output port opposite to the one output port. And a function of replenishing the compressed air with the ride airbag 3 in which part of the compressed air is discharged by the above-described safety valve 19 in accordance with the opening operation.

The pressure compensating valve 15 is installed on the pressure compensating pipe 22 extending from the other output port of the solenoid valve 12, and is set in advance to a predetermined pressure in consideration of the loading load and the ambient conditions. Accordingly, the ride airbag 3 is replenished by a predetermined pressure and flow rate set in the pressure compensation valve 15.

The first magnetic valve 13 is provided on the ride supply pipe 21 branched from the other side of the plurality of air tanks 11 to interrupt the supply of compressed air to the ride air bag 3 side.

The second magnetic valve 14 is provided at the inlet side of each ride airbag 3 separately and has an exhaust port for exhausting the compressed air in the ride airbag 3 to the outside, and the exhaust port side is equipped with a silencer 14a. .

The pressure gauge 16 is disposed near the driver's seat to couple to a pipe end extending into the ride airbag 3 to indicate the pressure in the ride airbag 3.

The up-down switch 17 is a kind of conventional three-stage switch composed of the up, down, and neutral terminals UP, DOWN, and M1. The falling terminal DOWN is electrically connected to the electromagnet of the solenoid valve 12, the neutral terminal M1 is grounded, and the rising terminal UP is connected to the discharge terminal EX of the compressed air supply switch 18 described later. Joined and electrically connected to the second magnetic valve 14. That is, this up-down switch 17 is electrically connected to the solenoid valve 12 and the second magnetic valve 14 to control the supply and discharge of compressed air to the lift airbag 2 and the ride airbag 3 to assist the axle. The lifting and lowering operation of (6) is to be made.

Compressed air supply switch 18 is a type of conventional three-stage switch consisting of discharge, supply, and neutral terminals (EX, SU, M2). The discharge terminal EX is electrically connected to the second magnetic valve 14 by joining with the rising terminal UP of the up-down switch 17 described above, and the supply terminal SU is electrically connected to the first magnetic valve 13. Is connected to, and the neutral terminal M2 is grounded. That is, this compressed air supply switch 18 is electrically connected to the first and second magnetic valves 13 and 14 to control the supply and discharge of compressed air to the ride air bag 3.

Hereinafter, the operation relationship of the pusher axle system of the present invention configured as described above will be described in detail.

First, when the auxiliary axle 6 is to be raised during the tolerance of a heavy vehicle, as shown in FIG. 3A, when the driver switches the up-down switch 17 to the rising terminal UP, the solenoid valve 12 is In the non-excited state, one output port communicating with the lift airbag 2 of the solenoid valve 12 is opened, and compressed air flows into the lift airbag 2 and expands. At this time, when the up-down switch 17 is switched to the neutral terminal M1, the inflow of the compressed air into the lift airbag 2 is stopped and the expanded state is maintained.

At the same time, power is applied to the discharge terminal EX of the compressed air supply switch 18 electrically connected to the rising terminal UP, and the second magnetic valve 14 is excited. As the second magnetic valve 14 is excited, the flow path of the second magnetic valve 14 is opened to discharge the compressed air filled in the ride airbag 3 to the outside, so that the ride airbag 3 is contracted. At this time, when the compressed air supply switch 18 is switched to the neutral terminal M2, the discharge of the compressed air of the ride airbag 3 is stopped to maintain its contracted state.

Accordingly, the auxiliary axle 6 rises due to the expansion of the lift airbag 2 and the contracting action of the ride airbag 3.

Next, to lower the auxiliary axle 6 when the heavy vehicle is loaded, as shown in FIG. 3B, when the driver switches the up-down switch 17 to the down terminal DOWN, The electrically connected solenoid valve 12 is excited. When the solenoid valve 12 is excited, one output port to which the lift airbag 2 of the solenoid valve 12 communicates is closed, and the other output port to which the pressure compensation pipe 22 of the solenoid valve 12 communicates is opened. do. Accordingly, the compressed air filled on the lift airbag 2 side is discharged to the outside through the exhaust port on which the silencer 12a of the solenoid valve 12 is mounted, so that the lift airbag 2 contracts. At this time, when the up-down switch 17 is switched to the neutral terminal M1, the discharge action of the lift airbag 2 is stopped and its contracted state is maintained.

When the compressed air supply switch 18 is connected to the supply terminal SU in such a state that the lift airbag 2 is contracted, the first magnetic valve 13 electrically connected to the supply terminal SU is excited. The flow path of the first magnetic valve 13 is opened. Accordingly, compressed air is supplied to the ride airbag 3 side, and the ride airbag 3 expands. At this time, the driver checks whether the pressure in the ride airbag 3 is in an appropriate state through the pressure gauge 16 disposed near the driver's seat, and when the driver switches to the neutral terminal M2, the air is supplied to the ride airbag 3. Is stopped and its expanded state is maintained.

As described above, the auxiliary axle 6 is lowered by the contracting action of the lift airbag 2 and the expansion action of the ride airbag 3.

On the other hand, the compressed air filled in the inside of the ride air bag (3) is discharged in small amounts to the outside through the safety valve 19 to absorb the vibration generated as the vehicle travels on the irregular road surface. At the same time, the compressed air in the air tank 11 is quickly replenished with the ride air bag 3 through the pressure compensating pipe 22 connected to the other open output port of the solenoid valve 12 as described above. That is, the pusher axle system of the present invention has a structure in which the compressed air in the ride airbag 3 is quickly replenished by external vibration and is quickly replenished while the auxiliary axle 6 is lowered. There is another feature that can absorb vibrations more efficiently.

The present invention described above, by using a three-stage switch to facilitate the supply and discharge of compressed air to the ride air bag, the lifting and lowering operation of the auxiliary axle is easy, precise and stable operability is ensured to extend the life is very excellent It works.

In addition, the present invention is characterized by effectively absorbing the vibration generated as the vehicle travels on an irregular road surface.

In the above, the present invention has been shown and described with respect to certain preferred embodiments. However, the present invention is not limited only to the above-described embodiment, and those skilled in the art to which the present invention belongs, without departing from the spirit of the technical idea of the present invention described in the utility model registration claims below. Any number of changes can be made.

Claims (1)

A lift assembly installed on one side of the vehicle body frame and having a lift and a ride airbag; An auxiliary axle fixedly coupled to one side of the elevating assembly and elevating by an inflating and contracting action of the lift and ride airbags; In the vehicle pusher axle system consisting of a pneumatic control circuit for selectively supplying and discharging compressed air to the lift and ride air bags of the elevating assembly, A main tank containing an air compressor; A plurality of air tanks for receiving compressed air from the main tank and supplying compressed air to the lift and ride air bags; A safety valve installed at one side of the ride airbag and discharging a part of the compressed air filled in the ride airbag according to the pressure in the ride airbag; Compressed air is provided on the lift supply pipe branched from the plurality of air tanks to one side, and supplies compressed air to the lift air bag connected to one output port and compressed air to the ride air bag side connected through a pressure compensation pipe to the other output port. Solenoid valves to selectively intervene replenishment; A pressure compensation valve installed on the pressure compensation pipe extending from the other output port of the solenoid valve to control the pressure and flow rate of the compressed air supplemented with the ride air bag; A first magnetic valve installed on a supply pipe for the ride branched from the plurality of air tanks to the other side to control compressed air supply to the ride air bag; A second magnetic valve communicating with one side of each of the ride airbags to control the discharge of compressed air filled in the ride airbags; A pressure gauge in communication with the ride airbag and disposed near the driver's seat to indicate pressure in the ride airbag; An up-down switch electrically connected to the solenoid valve and the second magnetic valve to selectively control the supply and discharge of compressed air to the lift airbag and the ride airbag to control the elevating operation of the auxiliary axle; And a compressed air supply switch electrically connected to the first and second magnetic valves to control the supply and discharge of compressed air to the ride airbag.