KR20050107661A - A shock absorber for commercial vehicles - Google Patents

Abstract

The present invention relates to a shock absorber for a commercial vehicle, and includes a bumper stopper 160 fixed to an upper side of the body valve 150 and an end portion of the piston rod 130 to include a bumper stopper 160 therein. The first housing 170 having a first flow path 171 communicating with an upper portion of the space 172 is formed, and the valve means 182 is installed in an inner space of the first housing 170. And a second housing 180 having a second flow passage 181 installed therein and communicating with the upper portion. Therefore, by installing a built-in hydraulic bumper stopper on the shock absorber, the shock absorber is effectively absorbed in a certain period of time, so that the shock absorber is not reduced to the minimum state, there is an effect that can maintain the optimum riding comfort during normal driving.

Description

Shock absorber for commercial vehicles {A SHOCK ABSORBER FOR COMMERCIAL VEHICLES}

The present invention relates to a shock absorber for a commercial vehicle, and more particularly, to a shock absorber for a commercial vehicle incorporating a hydraulic bumper stopper.

In modern cars, it is difficult to distinguish between axle and suspension because of its structure, so when the axle and suspension are described at the same time, the axle supports the weight of the vehicle through the wheels installed, but the impact load from the road surface while driving It requires strength and rigidity to withstand their loads, and the structural axle (rigid axle) connecting the left and right wheels to one axle, and the split axle type to allow the left and right wheels to move separately. can be divided into (divided axle).

The above axle type is mainly used in large vehicles such as trucks and buses, and split axle type, that is, independent type, are used in a type that emphasizes comfort and maneuverability, such as a passenger car.

When the rear suspension is independent, the load on the spring can be reduced, which improves the riding comfort and roadholding, thereby lowering the floor of the body, thereby increasing the space in the room. The current price is used. The power transmission to the drive wheels is also transmitted by the axle with the universal joint from the gearbox fixed underneath itself. In this way, the type in which the axle is circularly moved about the reduction gear by the vertical movement of the wheel is called a swing axle.

Types of independent type include swing axle type, trailing type, semi-trailing type and diagonal type.

The semi-trailing arm type above is widely used in commercial vehicles and vans, and some are also used in passenger cars. The advantage of this is that when there is not much space occupied by suspension, it is used when it is necessary to secure a lot of utilization space of the car body. As shown in FIG. 1, the semi-trailing arm type suspension system is a suspension arm (1). One side of the axle is mounted to the hub 2 of the axle, and the cross member 3 is mounted on the suspension arm 1 which maintains a constant angle with the center of the axle, and the bumper stopper 4 on the upper portion of the suspension arm 1. ) And the coil spring (5) are mounted, and the top of the bumper stopper (4) and the coil spring (5) is equipped with a center member (6) to be bumped during bumping, and one side of the suspension arm (1) The shock absorber 7 is installed, the other side of which is fixed to the vehicle body and attenuates the load of the vehicle body and the impact transmitted from the road surface.

In the suspension system of such a vehicle, the shock absorber 7 is limited to the minimum state by using only the bumper stopper 4 made of rubber material separately attached to the vehicle. The number of times of contact with the bumper stopper 4 increases due to rapid rotation in the state.

However, such a conventional bumper stopper 4 is so hard that the contact load and deformation characteristics are transmitted to the vehicle body as the impact force is in contact with the vehicle to hinder the ride. In addition, the contact number with the shock absorber 7 is increased so that there is a problem that the excessive load is applied to the mounting portion in a state where the damping force is not operated.

In the case of passenger cars solve this problem by using a polyurethane rubber (urethane rubber) exterior type, but in the commercial vehicle is limited space installation in the exterior, it is impossible to install the exterior type of the passenger car.

The present invention is to solve the conventional problems as described above, by installing a built-in hydraulic bumper stopper inside the shock absorber, so that the shock absorber effectively absorbs the shock in a certain period of time so that the shock absorber is not reduced to the minimum state, during normal driving In order to provide a shock absorber for a commercial vehicle that can maintain an optimum ride comfort.

In order to achieve the above object, the present invention is an oil-filled inner tube and outer tube, and the piston rod is coupled to the piston rod, and the other end is located inside the inner tube and the other end is extended to the outside of the outer tube In a commercial vehicle shock absorber comprising a valve, and a body valve coupled to a lower end of an inner tube and an outer tube, a bumper stopper fixed to an upper side of the body valve, and a bumper stopper disposed at an end of the piston rod, A second housing having a first housing having a first flow passage communicating with the upper portion, and a second flow passage installed at an upper portion of the first housing and having a valve means installed in the internal space and communicating with the upper portion. Provided is a shock absorber for a commercial vehicle comprising a housing.

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

Figure 2 is a cross-sectional view of the interior of the shock absorber for commercial vehicles according to the present invention, Figures 3a and 3b is a view showing the operating state of the shock absorber for commercial vehicles according to the present invention, Figure 4 is a commercial vehicle according to the invention This is the damping force characteristic curve which is shown by the bumper stopper action of the absorber.

The shock absorber 100 for a commercial vehicle shown in FIG. 2 includes an inner tube 120 filled with oil, an outer tube 110 half filled with oil, and one end thereof inserted into the inner tube 120. And the other end of the piston rod 130 extending outside the outer tube 110, the piston valve 140 generating the damping force at the end of the piston rod 130, the inner tube 120 and the outer tube 110. Body valve 150 is coupled to the bottom of the connection portion is provided.

Here, according to the characteristics of the present invention, the bumper stopper 160 on the upper side of the body valve 150 and the first housing 170 inserted into the bumper stopper 160 at the maximum compression of the shock absorber 100 to absorb shocks; The second housing 180 that controls the flow path is installed on the upper portion of the first housing 170.

The bumper stopper 160 is seated on an upper surface of the washer 152 of the body valve 150, and is fixedly installed by being fixed to the fixed shaft 154 extending in the center thereof.

And the inclined surface 162 is formed in the axial direction on the upper outer diameter of the bumper stopper 160 having a predetermined height.

The inclined surface 162 is formed to gradually narrow the outer diameter of the bumper stopper 160 toward the upper side, the length is preferably about 1/2 of the full length of the bumper stopper 160.

On the other hand, the first housing 170 provided at the end of the piston rod 130, the lower portion is opened in a cylindrical shape, and forms a space portion 172 therein.

The upper space portion 172 has an inner diameter that may include the bumper stopper 160 therein, and is substantially larger than the outer diameter of the bumper stopper 160.

A first flow path 171 is formed on the upper surface of the first housing 170 so as to communicate upward.

At least one first flow path 171 is formed along the circumferential direction.

In addition, a second housing 180 having the same shape as the first housing 170 is provided in contact with an upper surface of the first housing 170.

In addition, the valve means 182 is installed in the inner space of the second housing 180.

The valve means 182 includes a relief valve 183 which is limited to move up and down in the internal space of the second housing 180 and a valve spring 185 that is compressed and restored at the lower end of the relief valve 183. It consists of.

At least one slit groove 184 is formed on the outer circumferential surface of the relief valve 183 in the vertical direction.

In addition, at least one or more second flow paths 181 communicating on the upper surface of the second housing 180 are formed along the circumferential direction.

In addition, a third flow path 143 is formed on the valve washer 142 of the piston valve 140 so as to be in communication with the second flow path 181 of the second housing 180.

The operation of the shock absorber for a commercial vehicle according to the present invention configured as described above is as follows.

As shown by the solid line in FIG. 3A, the shock absorber 100 is in a minimum state, that is, a maximum compression state, when a vehicle with a large number of passengers or an overloaded state passes through a barrier or the like.

As the piston rod 130 descends, it is fitted to the bumper stopper 160 while compressing the oil located in the space 172 of the first housing 170. At this time, the high-pressure oil is inclined surface 162 of the lower bumper stopper 160 in a state where the upward movement is prevented because the relief valve 183 of the second housing 180 blocks the second flow path 181. Will exit to the bottom.

In this process, the shock absorber absorbs the shock and transmits the impact force transmitted to the external bumper stopper (shown in FIG. 1) separately installed in the vehicle like the internal bumper stopper 160 so that the shock absorber 100 is not reduced to the minimum state such as damage. The problem did not occur.

In addition, during normal road driving, the operation of the bumper stopper 160 may not occur.

When the tension is returned after the maximum compression, as shown by the dotted line in FIG. 3b, the piston rod 130 starts to return by the tensioning action immediately after the vehicle passes the barrier.

Therefore, a part of the oil between the body valve 150 and the piston valve 140 passes through the third flow path 143 of the valve washer 142 and the second flow path 181 of the second housing 180. In this process, the relief valve 183 moves downward while compressing the valve spring 185.

The oil passing through the second flow path 181 passes through the first flow path 171 of the first housing 170 along the inner side of the relief valve 183 and the slit groove 184 and flows into the space 172. do.

The oil introduced into the space 172 is pushed out of the lower side while pushing the bumper stopper 160.

Therefore, the quick return of the shock absorber 100 to the riding position is stabilized as in normal driving.

In the present invention, as shown in Figure 4, the damping force generated in the operating section of the bumper stopper 160 with the maximum compression is smoothly appearing as the load deformation characteristics pass through the inclined surface 162, and later strongly controlled damping force characteristic curve is As a result, the ride comfort of the vehicle is improved.

Although the present invention has been illustrated and described with respect to certain preferred embodiments, the present invention is not limited to the above-described embodiments, and a person skilled in the art to which the present invention pertains has the present invention set forth in the claims below. Various modifications may be made without departing from the spirit of the invention.

As described above, the shock absorber for a commercial vehicle of the present invention is provided with a built-in hydraulic bumper stopper inside the shock absorber, so that the shock absorber is effectively absorbed in a certain period of time so that the shock absorber is not reduced to the minimum state, and is optimal for normal driving. There is an effect that can maintain the riding comfort.

1 is a front view showing a part of a typical vehicle suspension,

2 is a cross-sectional view of the interior of a shock absorber for a commercial vehicle according to the present invention;

3a and 3b is a view showing the operating state of the shock absorber for a commercial vehicle according to the invention,

Figure 4 is a damping force characteristic curve represented by the bumper stopper action of the shock absorber for commercial vehicles according to the present invention.

<Description of the code | symbol about the principal part of drawing>

100: shock absorber 110: outer tube

120: inner tube 130: piston rod

140: piston valve 142: valve washer

143: third flow path 150: body valve

152 washer 160: bumper stopper

162: inclined surface 170, 180: first, second housing

171, 181: first and second euros 172: space part

182: valve means 183: relief valve

184: slit groove 185: valve spring

Claims (8)

An inner tube and an outer tube filled with oil therein, a piston rod partially disposed inside the inner tube and the other end extending outward of the outer tube, a piston valve coupled to the piston rod, and the inner tube and the outer tube In the commercial vehicle shock absorber consisting of a body valve coupled to the lower end of the connection, A bumper stopper fixedly installed at an upper side of the body valve; A first housing installed at an end of the piston rod to form a space to include the bumper stopper therein, the first housing having a first flow passage communicating therebetween; A second housing installed on an upper portion of the first housing and having a second flow path in which a valve means is installed in an internal space and communicates with the upper portion; Shock absorber for commercial vehicles comprising a. The method of claim 1, The bumper stopper is mounted on the upper surface of the washer of the body valve, the center of the shock absorber for commercial vehicles, characterized in that installed in the center of the fixed shaft extending extending. The method of claim 1, Shock absorber for a commercial vehicle, characterized in that the inclined surface is formed in the axial direction on the upper outer diameter of the bumper stopper. The method of claim 1, The first shock absorber for a commercial vehicle, characterized in that at least one is formed in the circumferential direction of the first flow path of the first housing. The method of claim 1, The valve means, A relief valve installed in the inner space of the second housing and limitedly moved upward and downward; Shock absorber for commercial vehicles, characterized in that consisting of a valve spring is installed on the bottom of the relief valve. The method of claim 5, At least one slit groove is formed in the vertical direction on the outer circumferential surface of the relief valve shock absorber for commercial vehicles. The method of claim 1, Shock absorber for commercial vehicles, characterized in that at least one second flow path of the second housing is formed along the circumferential direction. The method of claim 1, A shock absorber for a commercial vehicle, characterized in that the third flow path is formed on the valve washer of the piston valve so as to communicate with the second flow path.