KR200380908Y1 - Automatic wheel lift of trailer - Google Patents

Abstract

The present invention relates to a wheel automatic lifting device of a trailer, in order to automatically elevate the wheel according to the weight of the load loaded on the trailer, the horizontal frame is installed, the vertical frame connected to the horizontal frame and extends vertically toward the ground A frame having a vertical frame therein; A link arm having one end connected to a rotational shaft at an end of the vertical frame and having an axle seat fastened to a wheel at the other end thereof; A lowering airbag installed between the horizontal frame and the other end of the link arm; One end is fastened to the vertical frame, and the other end connected to the one end is a lift airbag fastened to a lower end of the link-arm behind the rotation shaft; An air tank supplying compressed air to the descending air bag and the rising air bag; And checking the pressure of the load loaded on the horizontal frame to selectively supply the compressed air supplied from the air tank to the lowering air bag or the rising air bag, thereby automatically elevating the wheels connected to the link-arm. It provides a wheel automatic lifting device of a trailer comprising a; load detection unit.

Description

Automatic wheel lift of trailer

The present invention relates to a trailer for a large cargo vehicle, and more particularly to a wheel automatic lifting device of the trailer for automatically lifting the wheel of the trailer according to the weight of the load loaded on the trailer.

In general, a trailer is a vehicle that carries a large amount of cargo exclusively, and when the cargo is loaded, the trailer is very heavy, and thus, the road and the bridge may be damaged while driving. Therefore, roads and bridges with weak grounds are restricted in terms of weight restrictions that are allowed to pass, and thus the operation of overloaded vehicles is controlled.

Most trailer vehicles are equipped with weight distribution wheels in order to drive the road controlled by this, and when the weight is exceeded, the mounted wheels are used to distribute and adjust the load applied to each wheel. It operated so that it might become below the limit weight.

For example, the bridge that the trailer vehicle intends to drive is less than 30 tons, and the wheel structure of the trailer vehicle consists of one front wheel and two rear wheels. If it is 100 tons including, the load of the vehicle applied to the wheel 1 point where the wheel of the trailer vehicle meets the bridge road is 100 tons 3 points = 33.3 tons. Therefore, the result is that the vehicle exceeds 30 tons, which is the weight limit of the passage.

On the other hand, in the case of a vehicle equipped with one more set of wheels of the trailer vehicle, if the wheels are lowered by operating the elevating device, 100 to = 4 points = 20 tons, so that it is possible to pass under the above-mentioned traffic limit weight. As a result, the effect can be expected without affecting bridges or roads.

The wheel for distributing the load of a trailer vehicle used for such a purpose is generally structured to elevate the wheel by swelling by compressed air to expand or reverse the volume. Therefore, the device for elevating the load distribution wheels of the trailer vehicle is a device that requires robustness as well as stable driving during the lifting movement.

The wheel lifting device 200 of the trailer 120 according to the prior art, as shown in Figures 6 and 7, is installed on the wheel shaft 121 of the trailer vehicle 110, if necessary, the wheel 121 It is a wheel lifting device for distributing the total load of the trailer vehicle 110 by letting the lowering) to reach the ground (S).

The wheel lifting device 200 according to the prior art has a main body 133 on one side of the lower end of the horizontal frame 131 of the upper end to raise the air bag 170 to the inside of the main body 133, the other air bag for lowering 150 is installed, and the link-arm 140 connected to the lower end of the lowering airbag 150 by the pivot shaft 141 is installed at the lower end of the main body 133 with the axle seat 143. In addition, the link arm 140 and the horizontal frame 131 has a structure in which a shock up bar 189 is installed in the vertical direction. At this time, the link-arm 140 is for lifting around the first link-arm 140a on the side of the axle seat 143 where the wheel 121 is installed about the pivot shaft 141 and the pivot shaft 141. It consists of a second link-arm 140b on which the airbag 170 is installed. Reference numeral 145 denotes a wheel shaft of the axle seat 143 on which the wheel 121 is installed.

Conventional wheel lift device 200 by operating the control switch (not shown) installed in the driver's seat of the trailer vehicle 110, the wheel by injecting or ejecting compressed air to the lowering airbag 150 and the rising airbag 170 It raises and lowers 121.

Looking at the step of lifting the wheel 121 by using the wheel lifting device 200 according to the prior art as such a structure, compressed air is injected into the rising air bag 170 and the compressed air of the lowering air bag 150 When discharged, ascending air bag 170 is inflated in the horizontal direction to push the link-arm 140 up, so that the wheel 121 installed at one end of the link-arm 140 is ground (s) Will rise from. At this time, the first link arm 140a is rotated counterclockwise about the rotation shaft 141 to raise the wheel 121 from the ground.

 On the contrary, the step of lowering the wheel 121 to reach the ground s is performed in the reverse of the above-described rising step. And when running in this state, the load of the vehicle weight is applied to the road due to the wheel 121 is additionally used.

By the way, the wheel lifting device of the trailer according to the prior art has the inconvenience that the driver must manually operate the control switch in accordance with the load of the cargo. In addition, since the wheel elevating device is operated according to the driver's judgment, a problem may occur such that it is not used when the use of the wheel is unnecessary or not used when the wheel is required.

And since ABS is not installed on the wheels of the trailer, there is a problem in that the braking ability falls.

In addition, since one end of the rising airbag is fastened to the main body and the other end is fastened to the second link-arm, mechanical stress is applied to the rotating shaft in the process of raising the first link-arm in which the wheels are connected to the pivot shaft. Will be used a lot. That is, when the second link-arm is pushed close to the horizontal direction by the operation of the lift airbag coupled to the second link-arm, the first link-arm connected to the rotation shaft is rotated counterclockwise. Since air pressure is transmitted to the rotating shaft as it is, mechanical stress acts on the rotating shaft.

In addition, when the load on the vehicle is small, the driver must intentionally raise the wheel of the vehicle. In case of driving in a state where the wheel of the vehicle is lowered due to the driver's carelessness, fuel economy due to friction with the ground of the vehicle wheel There were many drawbacks of wastage.

Therefore, a first object of the present invention is to provide a wheel automatic lifting device of a trailer capable of automatically lifting the wheel of the trailer according to the weight of the load loaded on the trailer.

It is a second object of the present invention to provide an automatic wheel lift device for a trailer equipped with an ABS module, in which a channel is automatically changed and operated according to whether the wheel is lifted or not.

It is a third object of the present invention to provide a trailer automatic lifting device for minimizing mechanical stress applied to a rotating shaft in a process of raising a wheel.

A fourth object of the present invention is to provide an automatic wheel lifting device for a trailer that can provide a stable ride to the driver while driving.

A fifth object of the present invention is to provide an automatic device for elevating the wheels of a trailer that can reduce fuel consumption during operation.

In order to achieve the above object, a wheel automatic lifting device of a trailer, comprising: a frame having a horizontal frame on which a loading box is installed, and a vertical frame connected to the horizontal frame and vertically extending toward the ground; A link arm having one end connected to a rotational shaft at an end of the vertical frame and having an axle seat fastened to a wheel at the other end thereof; A lowering airbag installed between the horizontal frame and the other end of the link arm; One end is fastened to the vertical frame, and the other end connected to the one end is a lift airbag fastened to a lower end of the link-arm behind the rotation shaft; An air tank supplying compressed air to the descending air bag and the rising air bag; And checking the pressure of the load loaded on the horizontal frame to selectively supply the compressed air supplied from the air tank to the lowering air bag or the rising air bag, thereby automatically elevating the wheels connected to the link-arm. It provides a wheel automatic lifting device of a trailer comprising a; load detection unit.

The load sensing unit according to the present invention selectively supplies a load sensor for checking the pressure of the load loaded on the horizontal frame, and compressed air supplied from the air tank according to a signal provided from the load sensor to the descending air bag or the rising air bag. It includes a solenoid valve.

The load sensor according to the present invention has a set pressure for raising and lowering the wheel, and checks the air pressure of the compressed air supplied from the air tank according to the pressure of the load loaded on the horizontal frame, the checked air pressure is set pressure Judge whether or not exceeded.

Wheel automatic lifting device according to the present invention further comprises a leveling valve for supplying compressed air to the load sensor according to the horizontal degree of the horizontal frame.

Ascending airbag according to the present invention is installed between the first bracket fastened to the vertical frame, the second bracket fastened to the lower end of the link-arm behind the rotational shaft, and the first and second brackets in accordance with the incoming and outgoing compressed air Contains bellows that are stretched.

And the automatic wheel lifting device according to the present invention may further include an ABS module connected to the wheel, and a pressure switch for operating the ABS module according to the signal provided from the load sensor.

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

1 is a block diagram showing a wheel automatic lifting device 100 of a trailer according to an embodiment of the present invention. FIG. 2 is a side view illustrating the trailer 20 in which the wheel automatic lifting device 100 of FIG. 1 is installed, and the wheel 21 is grounded to the ground s. 3 is an enlarged side view of the wheel automatic lifting apparatus 100 of FIG. 2.

1 to 3, the wheel automatic lifting device 100 of the trailer 20 according to the embodiment of the present invention is installed on the wheel 21 of the trailer 20 connected to the vehicle 10 and the wheel 21. ) Is a device for automatically elevating according to the weight of the load loaded on the trailer 20, the frame 30, the link-arm 40, the lowering airbag 50, the rising airbag 70, the air tank ( 60) and the load sensing unit 80.

The frame 30 includes a horizontal frame 31 on which the loading box 23 of the trailer is installed, and a vertical frame 33 connected to the horizontal frame 31 and vertically extending toward the ground s. Although the vertical frame 33 extends toward the ground s, the end of the vertical frame 33 is installed on the horizontal frame 31 to be spaced apart from the ground s.

At this time, since the wheel 21 is installed at the rear of the trailer 20, the frame 30 is a frame supporting the rear of the loading box (23). Two pairs of wheels are installed in the trailer 20, the wheel automatic lifting device 100 according to an embodiment of the present invention has been disclosed an example installed on the wheel 21 located relatively inward. In addition, when three pairs of wheels are installed, such as the trailer 110 shown in FIG. 6, the wheel automatic lifting device 100 according to the embodiment of the present invention may be installed on the outer wheels.

One end of the link-arm 40 is connected to the end of the vertical frame 33 by the pivot shaft 41, and the axle seat 43 to which the wheel 21 is installed at the other end thereof is fastened. In addition, the linkage according to the lifting and lowering of the wheel 21 generated when the trailer 20 is connected to the vertical frame 33 close to the horizontal frame 31 and the axle seat 43 is connected to the pull-up showbar 89 close to the vertical. The riding force is improved by buffering the vertical movement force of the arm 40. Reference numeral 45 denotes a wheel shaft of the axle seat 43 on which the wheels 21 are installed. Therefore, the link-arm 40 moves up and down about the pivot shaft 41.

The lowering airbag 50 is installed between the horizontal frame 31 and the other end of the link arm 40 and serves to lower the raised wheel 21. The lowering airbag 50 is a link-arm 40 according to the lifting and lowering of the wheel 21 generated when the wheel 21 is operated in conjunction with the pull-up showbar 89 when the wheel 21 is grounded to the ground s. Improves the riding comfort by buffering the vertical movement of the.

Ascending airbag 70 is one end is fastened to the vertical frame 33, the other end connected to one end is fastened to the lower end of the link-arm 40 behind the rotating shaft 41 serves to raise the wheel 21. In charge.

The air tank 60 supplies the compressed air to the lowering airbag 50 and the rising airbag 70 to provide driving force for raising and lowering the wheel 21. That is, the falling airbag 50 and the rising airbag 70 operate by receiving compressed air supplied from the air tank 60.

The load sensing unit 80 checks the weight of the load loaded on the horizontal frame 31 to selectively supply compressed air from the air tank 60 to the lowering airbag 50 or the rising airbag 70. The wheel 21 fastened to the link-arm 40 is automatically lifted.

Therefore, by installing the wheel automatic lifting device 100 according to the present invention to the wheel 21 of the trailer, it is possible to automatically lift the wheel 21 of the trailer according to the weight of the load loaded on the trailer 20.

In particular, the lifting airbag 70 according to the present invention is the first bracket 71 is fastened to the vertical frame 33, and the second bracket fastened to the lower end of the link-arm 40 behind the rotating shaft 41 ( 73 and a bellows 75 which is installed between the first and second brackets 71 and 73 and expands and contracts as the compressed air enters and exits. Therefore, when compressed air is supplied to the bellows 75, the bellows 75 expands and rotates the link-arm 40 connected to the second bracket 73 by rotating it counterclockwise about the rotational shaft 41. do.

As described above, since the lifting airbag 70 has a structure in which the second bracket 73 is fastened to the lower end of the link-arm 40 behind the pivot shaft 41, the lifting airbag 70 rotates in the process of raising the wheel 21. The mechanical stress applied to the coaxial 41 can be minimized. That is, since the lifting force of the link-arm 40 in accordance with the expansion of the bellows 75 acts directly on the link-arm 40 behind the rotating shaft 41 without passing through the rotating shaft as in the prior art, the rotating shaft The mechanical stress applied to (41) can be minimized.

The load sensing unit 80 checks the weight of the load loaded on the horizontal frame 31 and the compressed air supplied from the air tank 60 according to the signal provided from the load sensor 81. And a solenoid valve 83 for selectively supplying the lowering airbag 50 or the rising airbag 70.

At this time, the load sensor 81 is a kind of pressure sensor for operating the solenoid valve 83 in accordance with whether or not the set pressure is reached, the compression supplied from the air tank 60 according to the weight of the load loaded on the horizontal frame (31). The solenoid valve 83 is operated by checking the air pressure of air and comparing the checked air pressure with the set pressure. The set pressure is input to the load sensor 81, for example, the set pressure can be set to about 3 kPa, and can be adjusted as necessary.

The compressed air of the air tank 60 is supplied to the load sensor 81 through the leveling valve 85 through the check valve 87, the leveling valve 85 is compressed air according to the horizontal degree of the horizontal frame 31 Is supplied to the load sensor 81. The horizontal degree of the horizontal frame 31 is changed according to the weight of the load loaded on the horizontal frame 31, the leveling valve 85 to the lowering airbag 50 to adjust the horizontal level of the horizontal frame 31 Compressed air is supplied, and compressed air supplied to the lowering airbag 50 is also transmitted to the load sensor 81.

At this time, the load sensor 81 checks the air pressure of the compressed air supplied through the leveling valve (85). And when the wheel 21 is operated in the grounded state on the ground (s), the leveling valve 85 is the lowering airbag 50 in accordance with the change in the horizontal degree of the horizontal frame 31 generated during the trailer 20 operation Compressed air is selectively supplied to the driver to provide a stable ride to the driver.

The other wheel 21 is provided with an ABS module 91 which is automatically operated according to the lifting of the wheel 21. The ABS module 91 is operated in two or four channels according to the signal of the pressure switch 93. The pressure switch 93 operates the ABS module 91 in two or four channels according to the signal provided by the load sensor 81.

At this time, four wheels are installed in the trailer 20. The pressure switch 93 operates the ABS module 91 in four channels when the lifted wheels 21 are in contact with the ground, and the wheels 21 are grounded. If raised in the ABS module 91 operates in two channels.

The step of elevating the wheel 21 by using the automatic wheel lifting device 100 according to the present invention having such a structure will be described with reference to FIGS. 1 to 5. 2 and 3 show a state in which the wheel 21 is in contact with the ground s, and FIGS. 4 and 5 show a state in which the wheel 21 is raised from the ground s.

First, the step of raising the wheel 21 that is in contact with the ground (s) will be described, the state in which the wheel 21 is in contact with the ground (s) due to the load loaded in the stacking box 23 in the load sensor 81 This means that the checked air pressure exceeds the set pressure. At this time, the set pressure of the load sensor 81 may be set to 3 kPa.

In this state, when the load loaded in the stacking box 23 starts to be removed, the level of the horizontal frame 31 is changed, which is checked by the leveling valve 85 so that the compressed air of the air tank 60 is loaded with a load sensor ( 81). At this time, the load sensor 81 checks the air pressure of the supplied compressed air, and discharges the compressed air from the descending air bag 50 according to the checked air pressure.

When the load in the loading box 23 is further removed so that the air pressure checked by the load sensor 81 becomes lower than or equal to the set pressure, the load sensor 81 operates the solenoid valve 83 to compress the lift air bag 70. Supply air. Then, the compressed air of the lowering air bag 50 is discharged.

At this time, the lifting airbag 70 rotates the link arm 40 counterclockwise about the rotational axis 41 to raise the wheel 21 connected to the link arm 40 from the ground s. . Since the wheels 21 to which the rising airbag 70 is connected among the four wheels are lifted from the ground s, a fuel saving effect can be expected as compared to using the four wheels as they are. In addition, tire wear of the raised wheels 21 can be prevented, thereby extending tire life.

The load sensor 81 transmits a signal to the pressure switch 93 so that the ABS module 91 can be driven in two channels.

On the contrary, the step of lowering the raised wheels 21 will be described. A state in which the wheels 21 are raised means that a load of a certain weight or more is not loaded in the loading box 23 of the trailer. That is, it means a state in which the air pressure checked by the load sensor 81 does not reach the set pressure.

When the load starts to be loaded in the loading box 23 in such a state, the horizontal degree of the horizontal frame 31 is changed, and the leveling valve 85 checks the compressed air of the air tank 60 by the load sensor 81. To supply. At this time, the load sensor 81 checks the air pressure of the supplied compressed air, and if the checked air pressure exceeds the set pressure, the load sensor 81 operates the solenoid valve 83 to raise the airbag 70. Compressed air was supplied to block and supply to the falling airbag (50). Then, the compressed air of the rising air bag 70 is discharged.

At this time, the lowering airbag 60 rotates the link-arm 40 clockwise about the axis of rotation of the pivot shaft 41, thereby lowering the wheel 21 connected to the link-arm 40 to reach the ground S. do. Since all four wheels are grounded to the ground s, the load of the trailer 20 due to the load can be distributed.

The load sensor 81 transmits a signal to the pressure switch 93 so that the ABS module 91 can be driven in four channels.

On the other hand, embodiments of the present invention disclosed in the specification and drawings are merely presented specific examples to aid understanding, and are not intended to limit the scope of the present invention. It is apparent to those skilled in the art that other modifications based on the technical idea of the present invention can be carried out in addition to the embodiments disclosed herein.

Therefore, according to the structure of the present invention, the air pressure according to the weight of the load loaded on the trailer is checked in the load sensing unit and the checked air pressure is lowered compared to the set pressure installed in the load sensing unit. By selectively supplying the airbag or the lifting airbag, it is possible to automatically elevate the wheels engaged to the link-arms according to the weight of the load loaded on the trailer.

 In the conventional manual wheel lifting system, when the weight of the load exceeds the maximum load, there is a problem of a safety accident when the driver does not inadvertently operate it. If the weight of the load is small, it is unnecessary if the driver does not operate it. Although tire wear and fuel economy have been lost, in this design, the wheels of the vehicle are automatically raised and lowered according to the weight of the load without the driver's separate operation. Therefore, even if the driver does not pay extra attention, the problem of safety accident and unnecessary tires Wear and fuel economy can be prevented.

And since the second bracket of the lifting airbag according to the present invention for raising the link-arm connected to the rotational shaft has a structure fastened to the bottom of the link-arm behind the rotational shaft, it is applied to the rotational shaft in the process of raising the wheel. Mechanical stress can be minimized.

That is, since the lifting force of the link-arm acts directly on the link-arm behind the rotating shaft without passing through the rotating shaft as in the conventional art, as the bellows of the rising air bag expands, the mechanical stress applied to the rotating shaft is reduced. Since it can be minimized, the wear of the rotation shaft does not occur, so that the rotational movement around the rotation shaft is freed as in the beginning even after a long time of use, so that the apparatus can be used in the same state as the initial state even in the long time of use.

In addition, the pressure switch that operates the ABS module connected to the wheel in four or two channels can automatically operate in two or four channels by receiving a signal from the load sensing unit indicating whether the wheel is raised or not. That is, if the wheel is raised, the ABS module is operated in two channels, and if the wheel is in contact with the ground, the ABS module is operated in four channels.

In addition, the vertical frame portion close to the horizontal frame and the axle seat are coupled to the shock absorber close to the vertical to cushion the vertical movement force of the link-arm due to the lifting and lowering of the wheels generated when driving the trailer to improve the ride comfort.

In addition, even if the driver pays attention to the load on the vehicle, the wheel is automatically raised or lowered without raising or lowering the wheel. When the load on the vehicle is small, the wheel is raised and friction with the ground of the vehicle wheel is caused. There is an advantage that the consumption of fuel economy is significantly reduced.

1 is a block diagram showing a wheel automatic lifting device of a trailer according to an embodiment of the present invention.

FIG. 2 is a side view showing a trailer in which the wheel automatic lifting device of FIG. 1 is installed, and is a side view showing a state in which the wheel is grounded to the ground.

3 is an enlarged side view of the wheel automatic lifting apparatus of FIG. 2.

Figure 4 is a side view showing a trailer with the wheel automatic lifting device of Figure 1, a side view showing a state in which the wheel is raised from the ground.

5 is an enlarged side view of the wheel automatic lifting apparatus of FIG. 4.

Figure 6 is a side view showing a trailer with a wheel lifting device according to the prior art.

FIG. 7 is an enlarged side view of the wheel elevating device of FIG. 6.

Description of the main parts of the drawing

10: vehicle 20: trailer

21: wheel 23: loading box

30: frame 31: horizontal frame

33: vertical frame 40: link-arm

41: rotation axis 43: axle seat

45: wheel shaft 50: descending air bag

60: air tank 70: lift air bag

71: first bracket 73: second bracket

75: bellows 80: load detection unit

81: load sensor 83: solenoid valve

85: leveling valve 87: check valve

89: shock absorber 91: ABS module

93: pressure switch 100: wheel automatic lifting device

Claims (6)

As a trailer wheel lift device, A frame having a horizontal frame on which a stacking box is installed and a vertical frame connected to the horizontal frame and vertically extending toward the ground; A link arm having one end connected to a rotational shaft at an end of the vertical frame and having an axle seat fastened to a wheel at the other end thereof; A lowering airbag installed between the horizontal frame and the other end of the link arm; One end is fastened to the vertical frame, and the other end connected to the one end is a lift airbag fastened to a lower end of the link-arm behind the rotation shaft; An air tank supplying compressed air to the descending air bag and the rising air bag; And A load that checks the pressure of the load loaded on the horizontal frame to selectively supply the compressed air supplied from the air tank to the lowering air bag or the rising air bag to automatically lift and lower the wheels connected to the link-arm. Automatic lifting device of a trailer comprising a; sensing unit. The method of claim 1, wherein the load detection unit, A load sensor for checking the pressure of the load loaded on the horizontal frame; And a solenoid valve for selectively supplying the compressed air supplied from the air tank to the lowering air bag or the rising air bag in accordance with the signal provided from the load sensor. According to claim 2, wherein the load sensor has a set pressure for lifting the wheel is set, and checks the air pressure of the compressed air supplied from the air tank in accordance with the pressure of the load loaded on the horizontal frame, And determining whether the air pressure exceeded the set pressure. 4. The automatic device for lifting a trailer according to claim 3, further comprising a leveling valve for supplying compressed air to the load sensor according to the horizontality of the horizontal frame. The method of claim 2, wherein the rising air bag, A first bracket fastened to the vertical frame; A second bracket fastened to a lower end of the link arm behind the pivot shaft; And a bellows installed between the first and second brackets to expand and contract according to the incoming and outgoing of compressed air. According to claim 2, ABS module connected to the wheel; And a pressure switch for operating the ABS module according to the signal provided from the load sensor.