KR100691425B1 - the apparatus for not transmitting force to springs of suspension system during parking of a truck - Google Patents

Abstract

The present invention relates to a device for preventing a force from being transmitted to a spring of a suspension device during vehicle parking. The device comprises a first shock absorber and a second shock absorber installed on both sides of the front axle of the vehicle, which are made by adding a free piston under the piston of a conventional vehicle shock absorber, a hydraulic cylinder with a built-in hydraulic piston rod and a hydraulic piston, and a hydraulic cylinder. And an oil hose connecting the shock absorber and driving means for pushing or pulling the hydraulic piston rod from the outside of the hydraulic cylinder. The driving means may be selected from a device using a pressure of air supplied from an air tank or a device using a motor powered from a battery. When the device is simply configured according to the present invention, the vehicle body can be lifted by the shock absorber during parking so that no load is applied to the spring, thereby preventing the elasticity of the spring from being damaged rapidly.

Shock absorber, leaf spring, van, hydraulic cylinder, pneumatic cylinder, geared motor

Description

The apparatus for not transmitting force to springs of suspension system during parking of a truck}

1 is a perspective view showing a conventional vehicle suspension device,

2 is a cross-sectional view of a shock absorber according to an embodiment of the present invention;

3 is an overall system configuration according to an embodiment of the present invention;

4 is a configuration diagram of a driving means according to an embodiment of the present invention;

5 is a perspective view showing a part of a driving means shown in FIG. 4;

6 is a configuration diagram of a driving means according to another embodiment of the present invention;

FIG. 7 is a perspective view showing a part of the driving means shown in FIG. 6.

※ Explanation of code for main part of drawing

1: first shock absorber 2: second shock absorber

11: cylinder outer cylinder 12: cylinder inner cylinder

14: Piston Rod 15: Shock Absorber Piston

16: piston valve 20a: first hydraulic hose

20b: second hydraulic hose 20c: third hydraulic hose

20d: fourth hydraulic hose 21: hydraulic cylinder

22: hydraulic piston 23: hydraulic piston rod

25: head portion of hydraulic cylinder 26: rod portion of hydraulic cylinder

27: head cover of hydraulic cylinder 28: rod cover of hydraulic cylinder

31: pneumatic cylinder 32: pneumatic piston

33: head portion of the pneumatic cylinder 40: air pipe

41: direction control valve 42: air tank

52: bolt 53: motor

54: battery 500: drive means

S: switch

The present invention relates to a shock absorber of a lorry, and more particularly, by mounting a shock absorber according to the present invention in place of an existing shock absorber and installing a simple device, a shock absorber that relieves the shock transmitted to a spring when the lorry is running. Absorber When the vehicle is in the original function and the parking is used to prevent the force applied to the spring of the suspension device using the shock absorber.

Suspension of the vehicle is a device to improve the ride comfort and safety of the vehicle, the spring and the shock absorber are the main components. As shown in FIG. 1, the van is generally equipped with a leaf spring 200, and the shock absorber 100 absorbs the natural vibration generated by the shock received by the spring during driving of the vehicle to quickly attenuate the vibration to provide a ride comfort. It is installed between the vehicle body 400 and the axle 300 for good.

Suspension springs relieve shocks and vibrations from the road while driving, improving ride comfort.However, while the car does not need to be applied to the spring while the car is parked, the spring continues to be pressed against the car body. It was the conventional situation that it remained.

As such, when the spring is kept pressed while parking, the spring loses its original elasticity, which causes a problem that the function of the spring is rapidly damaged. The trucks are under heavy load for their own weight. If these trucks are parked all night with lots of cargo, truck drivers will be worried about the springs breaking down, which causes some drivers to park. In some cases, hydraulic jacks are used to support the vehicle body, and coil springs are inserted between the leaf springs to reinforce the springs, plates of the leaf springs are replaced, and used springs are replaced. However, supporting the body with the hydraulic jack is only an inconvenient and temporary means, and reinforcing or replacing the spring has a high cost, and if the spring is excessively strengthened, there is a problem in that the ride comfort during driving.

The present invention has been made to solve the above problems, the present invention is to ensure that the spring is in the state of the spring is not pressed by the load of the car body and cargo is not transmitted to the spring at all during parking of the truck Its purpose is to maintain it.

In order to achieve the above object, it would be desirable to construct a simple device using parts in the existing vehicle as much as possible, rather than to manufacture and attach a separate complicated device in terms of economic and practical use.

 Therefore, the present invention is equipped with the shock absorber according to the present invention in place of the existing shock absorber and by installing a simple device, the original function of the shock absorber to mitigate the shock transmitted to the spring when the truck is running, and when the parking An absorber is used to provide a device to prevent the force from being applied to the spring of the suspension device.

In order to achieve the above object, the device according to the present invention is an oil-filled cylinder outer cylinder, an oil hole at the top and an oil-filled cylinder inner cylinder, and a piston rod which is connected to the vehicle body upwards and downwards by raising and lowering the inner cylinder cylinder. And a pre-piston, which is linearly coupled to the cylinder inner cylinder closely below the piston, in a normal vehicle shock absorber having a piston coupled to the lower end of the piston rod and sliding inside the cylinder inner cylinder. A first shock absorber and a second shock absorber installed on both sides of the front axle of the vehicle and mounted on the vehicle and filled with oil, one end of which is located inside the hydraulic cylinder and the other end of which is a rod cover of the hydraulic cylinder. Hydraulic piece located outside of the hydraulic cylinder through the hole of the A hydraulic piston coupled to a ton rod, an end of the hydraulic piston rod located inside the hydraulic cylinder and linearly moving in a state of being tightly fitted to the hydraulic cylinder, a bottom surface of the cylinder inner cylinder of the first shock absorber and the hydraulic cylinder. The first hydraulic hose connecting the head portion, the second hydraulic hose connecting the cylinder outer cylinder of the first shock absorber and the rod portion of the hydraulic cylinder, the bottom surface of the cylinder inner cylinder of the second shock absorber and connecting the head portion of the hydraulic cylinder A third hydraulic hose, a fourth hydraulic hose connecting the cylinder outer cylinder of the second shock absorber and the rod portion of the hydraulic cylinder, and an end of the hydraulic piston rod located outside the hydraulic cylinder to axially move the hydraulic piston rod. It comprises a drive means for linear movement.

Alternatively, both the front and rear axles may be provided with a shock absorber and a hydraulic hose having the above configuration.

The driving means is an air tank for storing the air compressed by the air compressor while the vehicle is running, a pneumatic cylinder mounted to the vehicle, the diameter of which is larger than the hydraulic cylinder and the end of the hydraulic piston rod located outside the hydraulic cylinder is pneumatic Pneumatic cylinder installed to be located inside the cylinder, Pneumatic piston coupled to the end of the hydraulic piston rod located inside the pneumatic cylinder and tightly fitted in the pneumatic cylinder, linear movement in the axial direction, the air tank and the pneumatic pressure An air pipe connecting the head portion of the cylinder, and control means for controlling the air entering and exiting the pneumatic cylinder.

The control means may be positioned in the middle of the air pipe and operated by the driver's seat to be a directional valve for passing or blocking the air or for discharging the air of the pneumatic cylinder.

According to another configuration of the driving means, the driving means is a battery of the vehicle, the motor is mounted on the vehicle and connected to the battery, and can operate the start and stop through the switch in the driver's seat and can rotate in both directions, the motor It consists of a long rod-shaped bolt that is coupled to the shaft and rotates with the motor shaft, the end of the hydraulic piston rod on the outside of the hydraulic cylinder is a deep hole for the bolt can be inserted into the inner circumference of the hole A female thread corresponding to the bolt is formed and a cross section of the outer circumference of the hydraulic piston rod is formed into a polygon so as to fit into a polygonal hole of the rod cover of the hydraulic cylinder.

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

As shown in Fig. 2, the shock absorber according to the present invention is achieved by inserting a free piston 17 into a cylinder inner cylinder below the shock absorber piston in a conventional vane shock absorber. The free piston 17 may move finely according to the movement of oil while driving, but does not have a special function. When the truck is parked, when oil is supplied from the hydraulic hose 20a through the bottom of the cylinder inner cylinder 12, the free piston 17 rises up to come into contact with the shock absorber piston 15 and the oil supply stops. The shock absorber piston 15 is pushed upward. As the shock absorber piston 15 is raised, the piston rod 14 is raised and the vehicle body connected to the piston rod 14 is raised so that the force according to the load of the vehicle body and the load is not applied to the leaf spring. To achieve. When the shock absorber piston 15 is raised, the oil in the cylinder inner cylinder 12 on the shock absorber piston 15 flows out into the cylinder outer cylinder 11 through the oil hole 13 in the upper portion of the cylinder inner cylinder, and the cylinder outer cylinder 11 The oil in the oil is drawn out to the cylinder outer cylinder 11 and the hydraulic hose (20b) through.

The inner wall of the cylinder is made of steel and chrome plated with a thickness of 0.05mm to prevent wear and corrosion of the inner surface. A non-metallic piston ring is fitted around the shock absorber piston 15 and the free piston 17 to prevent wear of the cylinder wall.

The shock absorber according to the present invention adopts a piston rod 14 having a diameter thicker than that of the conventional shock absorber, since the shock absorber must support the vehicle body without the aid of a spring. If the force on the front axle is 11000 kg _f, the piston rod 14 of each shock absorber should have a diameter that can withstand a load of 5500 kg _f .

As shown in FIG. 3, the shock absorbers 1 and 2 modified according to the present invention are preferably mounted only on both sides of the front axle of the van and use the existing shock absorber as it is on both sides of the rear axle. This is because in the case of a large truck, the front spring and the rear axle, even if the same load acts because the leaf spring of the front axle is weak compared to the rear axle is mainly a problem. However, the present invention does not exclude the installation of a modified shock absorber on both the front and rear axles.

The oil is contained in the inner and outer cylinders of the hydraulic cylinder 21 and the shock absorber cylinder connected to it, and the oil capacity of the hydraulic cylinder 21 is the shock absorber when the free piston of each shock absorber (1, 2) is raised to the highest. It is equal to the total amount of oil supplied to.

When the driver operates the driving means 500 while the vehicle is parked, and the driving means 500 pushes the hydraulic piston rod 23 toward the head of the cylinder, the oil in the head portion 25 of the hydraulic cylinder is first. Out of the hydraulic cylinder 21 through the hydraulic hose 20a and the third hydraulic hose 20c. The oil passing through the first hydraulic hose 20a enters the cylinder inner cylinder of the first shock absorber 1, and the oil coming out of the cylinder outer cylinder of the first shock absorber 1 is hydraulically supplied through the second hydraulic hose 20b. It enters the rod portion 26 of the cylinder. On the other hand, the oil passing through the third hydraulic hose 20c enters the inner cylinder of the second shock absorber 2, and the oil coming out of the outer cylinder of the second shock absorber 2 is hydraulically supplied through the fourth hydraulic hose 20d. It enters the rod portion 26 of the cylinder. On the contrary, when the hydraulic piston rod 23 is pulled by the driving means 500, the oil in the rod portion 26 of the hydraulic cylinder passes through the cylinders of the shock absorbers 1 and 2 to the head portion 25 of the hydraulic cylinder. Returned to).

4 and 5 are schematic diagrams showing the configuration of drive means in a vehicle equipped with an air compressor. In general, a vehicle of 5 tons or more is provided with an air compressor, and in a large vehicle equipped with an air compressor, there are many places for installing a cylinder or the like on the frame. Passenger cars can be installed in the trunk if there is no space in the engine compartment.

Compressed air generated by the air compressor 43 actuated by the force of the engine is stored in the air tank 42, which is a pneumatic cylinder integrally formed with the hydraulic cylinder 21 through the air pipe 40. Connected with (31). The directional valve 41 located in the middle of the air pipe 40 is located in the driver's seat, which can be operated from the driver's seat, and is switched as needed to control the flow of air. The first of the three functions is that of the air tank 42 The air may be supplied to the pneumatic cylinder 31, the second may be cut off the supply, and the third may be to discharge the air of the pneumatic cylinder 31 to the outside.

Within the pneumatic cylinder 31 is a pneumatic piston 32 which is connected to the end of the hydraulic piston rod 23. The pneumatic cylinder 31 has a much larger diameter than the hydraulic cylinder 21, which is supplied from the air tank 42 when the cross sectional area of the hydraulic piston 22 is smaller than the cross sectional area of the pneumatic piston 32 according to Pascal's principle. This is because a large amount of low pressure compressed air can be converted into a small amount of high pressure hydraulic fluid, thereby obtaining a strong force for lifting the body. The ratio of the diameter of the pneumatic cylinder 31 and the hydraulic cylinder 21 is determined according to the load of the vehicle body and the expected load.

Referring to the operation of the present invention having a drive means as shown in Figures 4 and 5 as follows. As a first step, when the directional valve 41 is operated to allow the compressed air to enter the head portion 33 of the pneumatic cylinder, the pneumatic piston 32 is pushed by the compressed air, thereby connecting the hydraulic piston rod 23 and the hydraulic piston rod 23. The hydraulic piston 22 is pushed and the oil discharged out of the hydraulic cylinder 21 by the hydraulic piston 22 enters the inner cylinder of the cylinder and lifts the vehicle body by raising the free piston. As a second step, when the supply of air is cut off by operating the direction switching valve 41, the pneumatic piston 32 and the hydraulic piston 22 are stopped and the vehicle body is lifted. As a third step, when the air in the pneumatic cylinder 31 is discharged to the outside by operating the direction switching valve 41, the free piston is pushed down by the load of the vehicle body and the cargo, and the oil discharged due to the free piston falling is It enters the head portion 25 of the hydraulic cylinder and moves the hydraulic piston 22, the hydraulic piston rod 23 and the pneumatic piston 32 connected thereto in the opposite direction as in the first stage to return to the state before the first stage and return the vehicle. It becomes a state suitable for running.

6 and 7 are schematic views showing the configuration of the drive means using a motor. In a truck without an air device, the device configured as follows may be used as a driving means.

The motor 53 is a geared motor equipped with a reduction gear, which is fixed in the motor housing 51 integrally formed with the hydraulic cylinder 21, and a long rod-shaped bolt 52 coupled to the shaft of the geared motor so as to rotate together with the shaft. ) Is inserted into the hydraulic piston rod 23 and a female thread corresponding to the bolt 52 is formed on the inner circumference of the hydraulic piston rod 23 so that the bolt 52 rotates inside the hydraulic piston rod 23. When the hydraulic piston rod 23 is pushed or pulled according to the rotation direction of the bolt (52). The force and speed at which the piston can be pushed can vary depending on the gear ratio of the geared motor. The motor 53 uses a shaft which can be rotated in both directions according to the operation of the switch. At this time, in order to prevent the hydraulic piston rod 23 from rotating together with the bolts 52, the outer circumference of the hydraulic piston rod 23 is square and the hydraulic piston rod 23 is sandwiched as shown in FIG. The hole is also rectangular so that the rotation of the hydraulic piston rod 23 is impossible. The electric power is supplied or cut off from the battery 54 to the motor 53 by the on / off of the switch S which runs between the battery 54 and the motor 53 by the electric wire 55 and which can be operated by a driver's seat.

Referring to the operation of the present invention having a drive means as shown in Figure 5 as follows.

As a first step, when the switch S is operated to supply electric power from the battery 54 to the motor 53, the bolt 52 is rotated left together with the motor shaft and the hydraulic piston rod 23 is pulled from the bolt 52. At the same time, the hydraulic piston rod 23 is pushed toward the head of the hydraulic cylinder 21, and the oil discharged out of the hydraulic cylinder 21 by the hydraulic piston 22 pushed together enters the cylinder inner cylinder of each shock absorber. Raising the piston raises the car body. As the second step, when the switch S is operated so that electric power is not supplied from the battery 54 to the motor 53, the motor shaft stops and the bolt 52, the hydraulic piston rod 23, and the hydraulic piston 22 are stopped. The vehicle stays in the stopped state, leaving the body up. As a third step, if the power is supplied from the battery 54 to the motor 53 by operating the switch S, but the motor shaft is turned to the right as opposed to the first step, the hydraulic piston rod 23 is driven into the bolt 52. The hydraulic piston rod 23 is moved in the opposite direction as in the first step, thereby expanding the space of the head portion 25 of the hydraulic cylinder, and the free piston is lowered by the load of the vehicle body and the cargo. By pushing the oil into the head portion 25 of the cylinder, the state is returned to the state before the first stage, and the state is suitable for driving the vehicle.

Technical means of the present invention is not limited to the shape or shape and coupling configuration shown in the embodiment, various changes will be possible based on the technical idea of the present invention.

As described above, according to the device according to the present invention, when the truck is parked, the body is supported by the shock absorber so that no force is applied to the spring. The life of the spring can be extended, reducing the cost and effort of replacing and reinforcing the spring. In addition, the shock absorber according to the present invention has the advantage that it can be very simply configured at a low cost because it does not need a separate air tank or battery for operation as it is installed in the seat where the existing shock absorber is mounted. The device does not operate during operation, so there is no problem in terms of safety.

Claims (5)

delete delete An oil-filled cylinder outer cylinder, an oil-filled cylinder inner cylinder with an oil hole at the top, a piston rod which is connected to the vehicle body up and down and is connected to the vehicle body upwards, and coupled to a lower end of the piston rod. A normal vehicle shock absorber having a piston sliding inside the inner cylinder is added by adding a free piston under linear movement in a state where the piston is tightly fitted to the inner cylinder of the cylinder, and on both sides of the rear axle or the front axle of the vehicle. The first shock absorber and the second shock absorber are installed in the vehicle, the oil-filled hydraulic cylinder, one end is located inside the hydraulic cylinder and the other end passes through the hole of the rod cover of the hydraulic cylinder to Hydraulic piston rod located on the outside, the inside of the hydraulic cylinder A hydraulic piston coupled to an end of the hydraulic piston rod and linearly moving in a state of being tightly fitted to the hydraulic cylinder, a first hydraulic hose connecting the bottom surface of the cylinder inner cylinder of the first shock absorber to the head portion of the hydraulic cylinder; A second hydraulic hose connecting the cylinder outer cylinder of the first shock absorber and the rod portion of the hydraulic cylinder, a third hydraulic hose connecting the underside of the cylinder inner cylinder of the second shock absorber and the head portion of the hydraulic cylinder, the second shock absorber A fourth hydraulic hose connecting the outer cylinder of the hydraulic cylinder with the rod portion of the hydraulic cylinder, and a driving means coupled to the end of the hydraulic piston rod located outside the hydraulic cylinder to linearly move the hydraulic piston rod in an axial direction. The driving means is an air tank for storing the air compressed by the air compressor while the vehicle is running, a pneumatic cylinder mounted to the vehicle, the diameter of which is larger than the hydraulic cylinder and the end of the hydraulic piston rod located outside the hydraulic cylinder is pneumatic Pneumatic cylinder installed to be located inside the cylinder, Pneumatic piston coupled to the end of the hydraulic piston rod located inside the pneumatic cylinder and tightly fitted in the pneumatic cylinder, linear movement in the axial direction, the air tank and the pneumatic pressure Air pipe connecting the head portion of the cylinder, the device for preventing force from being transmitted to the spring of the suspension device during vehicle parking, characterized in that the control means for controlling the air entering and exiting the pneumatic cylinder The method of claim 3, wherein the control means is located in the middle of the air pipe and operating in the driver's seat by passing through or blocking the air or the direction change valve for discharging the air of the pneumatic cylinder, the force on the spring of the suspension device during vehicle parking To prevent this from being passed The motor of claim 3, wherein the driving means is mounted on a battery of the vehicle, the vehicle, connected to the battery, and capable of manipulating start and stop through a switch in the driver's seat and rotating in both directions. It is composed of a long rod-shaped bolt coupled to rotate with the motor shaft, the end of the hydraulic piston rod on the outside of the hydraulic cylinder is a deep hole for the bolt can be inserted into the inner circumference of the hole A female thread corresponding to the cross section of the outer circumference of the hydraulic piston rod is formed in a polygonal shape so as to be fitted into the polygonal hole of the rod cover of the hydraulic cylinder, the force is not transmitted to the spring of the suspension device during vehicle parking. Disabling device

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