KR100235446B1 - Double cylinder type shock absorber - Google Patents

Abstract

The present invention relates to a stationary device mounted between two oscillating members to absorb vibration and shock, and in particular, by installing a double cylinder to change the damping constant according to the excitation force to protect the device by having an appropriate buffering force suitable for the excitation force The present invention relates to a double cylinder type shock absorber capable of extending the life. The apparatus inserts a second cylinder into the interior of the first cylinder and divides it into two cavities so that the second cylinder moves in this space. Then, the first and second elastic members are coalesced on both ends of the second cylinder to receive the compressive force. In addition, the piston was mounted inside the second cylinder to divide into two cavities, and a second orifice was installed on the piston to configure the fluid to flow through the orifice. In addition, the first cylinder orifice is also formed in the second cylinder to allow fluid to flow through the second orifice when a small impact is applied, and when a medium force is applied, the second cylinder is moved and cushioned by the elastic member. In addition, when a large force is applied, the damping constant is changed according to the magnitude of the force of the fluid flowing through the first orifice. In this way, it is possible to extend the life of the device and have an appropriate cushioning effect according to the vibration force.

Description

Double cylinder type shock absorber

1 is a structural diagram of a double cylinder-type shock absorbing device according to the present invention.

2 is a structural diagram of a front surface of a truck showing an example of use of the apparatus.

* Explanation of symbols for main parts of the drawings

10: first cylinder 11: cylinder rod

12: cylinder support portion 13: first rod hole

20: second cylinder 21: the first orifice

22: the third orifice 23: the second rod ball

30: first elastic member 31: second elastic member

40: piston 41: second orifice ball

42: piston rod 43: piston support

50: airtight member 60: chassis frame

70: cap 80, 90: shock absorber

The present invention relates to a device mounted between two swinging members to absorb vibration and shock, in particular, by installing a double cylinder to change the damping constant according to the excitation force to have a proper buffering force suitable for the excitation force to protect the device and life It relates to a double cylinder-type shock absorbing device that can extend.

In general, the machine may cause some fluctuations in operation. Such a machine needs a device to absorb shaking. Such a shock absorber is often used in a vehicle, and the vehicle is connected to the axle and the vehicle body so that the vibration or shock received from the road surface is transmitted to the vehicle body when the vehicle travels. At this time, the suspension is designed on the vehicle in order to prevent such vibrations or shocks to be directly transmitted to prevent damage to the vehicle body or cargo and to improve ride comfort. Such a suspension system is configured by combining a chassis sheath spring to alleviate the impact received from the road surface, a shock absorber that suppresses the free vibration of the chassis sheath spring to improve ride comfort, and a stabilizer for preventing the vehicle from shaking sideways. In particular, the shock absorber in the suspension system, that is, the shock absorber absorbs the kinetic energy by using a spring, rubber, air pressure, hydraulic pressure. Such a shock absorbing device absorbs mechanical shock by inserting a fluid or the like into the cylinder to move through the orifice.

However, such a device has a problem that the damping coefficient is related only to the speed and the buffering effect is inferior regardless of the displacement due to compression or tension.

Accordingly, an object of the present invention is to provide a double-cylinder type shock absorbing device to have a stable damping under any driving conditions by having a damping constant to vary according to the magnitude of the excitation force to have an appropriate damping force at various excitation forces and excitation frequencies. have.

The double cylinder-type shock absorbing device according to the present invention for achieving the above object is provided with a first cylinder having a predetermined space fixed and sealed to the first member of the two members. And a second cylinder having a first orifice formed to partition and move the space of the first cylinder, the inner space having a predetermined size, and a fluid to flow between the inner space and the partitioned space. . The first and second elastic members are respectively installed in two partitioned inner spaces of the first cylinder and press the second cylinder to a predetermined pressure. The piston is fixed to the second member, and divides the second cylinder into two spaces, and has a piston having a second orifice communicating the two spaces.

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

1 is a structural diagram of a double cylinder-type shock absorbing device according to the present invention. As shown, the first cylinder 10 is fixed to the cylinder support 12 by the cylinder rod 11. In addition, the first cylinder 10 has a sealed inner space in which the fluid is indented. The second cylinder 20 is rotatably inserted into this space. In particular, the second cylinder 20 divides the internal space of the first cylinder 10 into two first and second cavities A and B. The first elastic member 30 is piled up in the divided one cavity A, and the second elastic member 31 is piled up in the second cavity B. At this time, the first and second elastic members 30 and 31 are composed of springs having different tensions to provide different restoring forces for left and right compression. The piston 40 is fixedly inserted into the internal space of the second cylinder 20, and the internal space of the second cylinder 20 is divided into third and fourth cavities C and D. The second cylinder 20 described above is further provided with first and third orifices 21 and 22. In particular, the first orifice 21 is formed on the side wall of the second cylinder 20 facing the first cavity A, and is configured to communicate the first cavity A and the third cavity C. In addition, the third orifice 22 provided to face the first orifice 21 is formed to communicate the second cavity B and the fourth cavity D. The second orifice 41 is formed in the piston 40 so as to communicate with the third cavity C and the fourth cavity D. Of course, the fluid infiltrated into the third cavity C and the fourth cavity D passes through the second orifice 41. In addition, a piston rod 42 is attached to the piston 40, and the piston 40 is fixed to the piston support 43 by the piston rod 42. At this time, the piston rod 43 is fixed to the piston support 43 through the first rod hole 13 of the first cylinder 10 and the second rod hole 23 of the second cylinder 20. In particular, an airtight member 50 is attached to the first rod hole 13 of the first cylinder 10 to prevent the fluid from leaking. In addition, the diameter of the second orifice 41 is larger than that of the first and third orifices 21 and 22 of the second cylinder 20.

2 shows an example in which the apparatus is mounted on a suspension of a truck and used. The cap 70 is provided at the upper portion of the chassis frame 60. A suspension device is installed between the chassis frame 60 and the cap 70 to cushion the vibration of the chassis frame 60 to improve the riding comfort of the cap 70 and to protect the device. As illustrated, the shock absorbing devices 80 and 90 of the present apparatus are disposed on the front and rear surfaces of the chassis frame 60 to absorb the vibration of the chassis frame 60 and transmit the vibrations to the cap 70.

Now, the operation of the apparatus will be described in detail with reference to the above-mentioned drawings.

When an external force is applied, the piston 40 moves in a right direction to closely contact the fluid of the fourth cavity D. At this time, the fourth cavity (D) is reduced and the third cavity (C) is enlarged so that the fluid in the fourth cavity (D) flows into the third cavity (C) through the second orifice (41). Of course, at this time, the second cylinder 20 is located at an intermediate point of the first cylinder 10 by the compressive force of the first elastic member 30 and the second elastic member 31. In this state, when the pressure for pushing the fluid in the fourth cavity D is greater than the compressive force of the second elastic member 31, the second cylinder 20 moves on the first cylinder 10. At this time, the piston 40 located inside the second cylinder 20 also continuously compresses the fourth cavity D to contact the wall surface of the fourth cavity D side of the second cylinder 20. Then, the second orifice 41 and the third orifice 22 overlap, and when a larger force is applied in the state, the fluid in the second cavity B through the small third orifice 22 is removed. Move to cavity 1 (A). In this way, the damping constant is changed because the orifice through which the fluid is moved varies according to the magnitude of the excitation force.

As described above, the double-cylinder-type shock absorbing device according to the present invention can be buffered according to various excitation force because the damping constant is changed according to the excitation force, thereby preventing the damage and extend the life of the device Has

Claims (4)

An apparatus for absorbing shock between two members, comprising: a first cylinder having a predetermined space fixed and sealed to a first member of the two members; A second cylinder which is installed to be movable by partitioning the space of the first cylinder, has a predetermined internal space, and has a first orifice configured to allow fluid to flow between the internal space and the partitioned space; First and second elastic members which are respectively installed in two partitioned inner spaces of the first cylinder and press the second cylinder to a predetermined pressure; And a piston fixed to the second member, the piston having a second orifice for dividing the second cylinder into two spaces and communicating the two spaces. The shock absorbing device according to claim 1, further comprising a piston rod for fixing the piston to the second member. The shock absorbing device according to claim 2, wherein the first cylinder has a first rod hole through which the piston rod passes. The shock absorbing device according to claim 3, wherein the first rod hole is attached with an airtight member for maintaining the airtightness of the fluid.