KR101847810B1 - 2 Stage Damper - Google Patents

Abstract

The present invention relates to a damper, and more specifically, to a two-stage damper. A part of a cylinder where gas or oil is charged is cut and manufactured so that the inner diameter (inside diameter) of the cylinder can be changed. In addition, when a piston reaches a certain section during a reciprocating movement of the piston, a flow rate of gas or oil filled in the cylinder is rapidly changed so that damping force of a piston rod fixedly coupled with the piston can be rapidly changed.

Description

 2 stage damper {2 Stage Damper}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a damper, and more particularly, to a damper, in which a part of a cylinder to which gas or oil is charged is cut so that an inner diameter (inner diameter) thereof is changed. When the piston reaches a predetermined section during reciprocation of the piston, The damper is a two-stage damper capable of rapidly changing the damping force of the piston rod fixedly coupled with the piston.

Generally, a damper is a device for absorbing the shock that occurs when an object such as a door is opened or closed. When the door is opened or closed, the damper does not stop the noise or impact generated by colliding with the door frame, (Shock absorber) or gas spring (gas spring).

Generally, a damper, a shock absorber or a gas spring is classified according to the material used for the operation and the internal filling, and the operation is performed in both directions of compression and rebound. , And compression and stretching in one direction is called single acting.

In addition, according to the material used for charging, the method of filling the inside of the cylinder with oil and absorbing the impact by the pressure of oil is called as "hydraulic type". By using the pressure of oil filled in the cylinder and the repulsive force of gas, .

The damper, the shock absorber, or the gas spring generates a resistance due to friction generated when the packing filled in the cylinder passes through the orifice during the upward stroke or the downward stroke and is referred to as a damping force, When it moves slowly, its damping force becomes small. When it moves fast, it absorbs shock by using the principle that it becomes bigger.

As a related art related to this, there is a gas spring of an automobile disclosed in Korean Utility Model Publication No. 20-1999-0028458.

A rod 18 protruded at one end of the utility model is integrally formed and a piston 12 through which an orifice nozzle 14 is inserted is inserted into the housing 8 and is connected to the rod 18 by an orifice action of a working fluid. The gas spring 6 is formed at one side of the housing 30 of the gas spring 6 so as to be larger than the diameter of the housing 30 so as to be convex from the housing 30. [ There is proposed a gas spring structure for an automobile in which a forming section 32 is formed and an orifice nozzle 40 is formed between the forming section 32 of the housing 30 and the piston 12, The piston moving along the housing during the reciprocating movement of the piston rod can be moved in a non-contact manner with the contact portion moving in contact with the inner wall surface of the housing, Since the piston is prevented from moving smoothly due to the occurrence of a stiffening portion and the rod is guided only by the portion that can be guided separately when the piston moves over the contact portion from the noncontact portion, the rod is subjected to a strong load and the piston collides with the wall surface of the housing, Is likely to occur.

Also, since the O-ring assembled in the piston comes into contact with only the straight section of the inside of the housing, damage due to friction occurs when the piston reciprocates, and it is difficult to obtain a desired damping effect due to leakage of gas through the gap due to damage to the O-ring.

Korean Utility Model Registration No. 20-1999-0028458

Accordingly, in the present invention, a part of a cylinder to which gas or oil is charged is cut so that an inner diameter (inner diameter) thereof is changed. When the piston reaches a certain section during reciprocation of the piston, the flow rate of gas or oil filled in the cylinder rapidly changes So that the damping force of the piston rod fixedly coupled with the piston can be rapidly changed.

Further, by providing an inclined portion between the intervals where the inner diameter change occurs, the movement of the piston is guided by the inclined portion to increase the stability against the movement of the piston, thereby reducing the noise. By fixing the piston rod of the damper to the door, There is a further object to provide a two-stage damper capable of opening the door at a high speed by minimizing the damping force at the time of opening.

A damper for absorbing an impact generated when a door is opened and closed, the damper being formed by cutting a part of a cylinder filled with a gas or an oil so as to have different inner diameters, The gap between the piston and the cylinder is changed, and the amount of movement of the gas or oil is rapidly increased to the gap, thereby adjusting the damping force.

In the two-stage damper according to the present invention, a part of a cylinder filled with gas or oil is cut so that an inner diameter (inner diameter) of the cylinder is changed. When the piston reaches a predetermined section during reciprocation of the piston, There is an effect that the damping force of the piston rod fixedly coupled with the piston can be drastically changed, and an inclined portion is provided between the intervals where the inner diameter changes, so that the movement of the piston is guided by the inclined portion, There is a remarkable effect that the door can be opened at a high speed by minimizing the damping force when the door is opened by fixing the piston rod of the damper to the door.

1 is a perspective view of a separate configuration of the present invention
Fig. 2 is an enlarged enlarged view
Figure 3 is a schematic cross-
4 is a partial schematic view of the present invention
Fig. 5 is an explanatory diagram
6 is a cross-sectional view of a cylinder according to the present invention
7 is a view showing the constitution of the piston according to the present invention

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a damper, and more particularly, to a damper, in which a part of a cylinder to which gas or oil is charged is cut so that an inner diameter (inner diameter) thereof is changed. When the piston reaches a predetermined section during reciprocation of the piston, The damper is a two-stage damper capable of rapidly changing the damping force of the piston rod fixedly coupled with the piston.

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

FIG. 3 is a structural cross-sectional view of the present invention, FIG. 4 is a partial structural view of the present invention, and FIG. 5 is a cross- 6 is a sectional view of a cylinder according to the present invention. A damper for absorbing impact generated when a door is opened and closed, in which the damper is made of gas or oil A part of the cylinder 10 to be filled is cut so that the inside diameter thereof is changed so that the gap between the piston 70 and the cylinder 10 changes when the piston 70 moved along the inside of the cylinder 10 reaches a specific section And the amount of movement of the gas or oil is rapidly increased to the gap, thereby controlling the damping force.

That is, in the damper according to the present invention, the clearance between the piston (70) and the cylinder (10) varies in accordance with the movement interval of the piston rod (20), thereby rapidly changing the flow rate of gas or oil moving to the gap, The fixed part 1 is fixed to the cylinder 10 and does not move and the moving part 2 is fixed to the piston rod 20 and is moved in accordance with the movement of the piston rod 20 .

The damping force generated by the gas or oil charged in the cylinder 10 is generated by moving the cylinder 10 along the inside of the cylinder 10. [ A piston rod 20 fixedly coupled to the inside of the cylinder 10 to perform an operation of moving the piston rod 20 in the center of the piston 70, A rod guide 30 for guiding the movement of the cylinder 10 and a lower cap 100 for preventing gas or oil charged in the cylinder 10 from leaking to the outside.

First, the cylinder 10 is cylindrical and filled with gas or oil. In some cases, gas or oil can be charged in a complex manner.

An orifice is formed on one side of the piston 70 so that gas or oil is moved through the orifice and gas or oil is also moved through the gap between the piston 70 and the cylinder 10. The gas or oil is supplied to the piston 70, the damping force is generated.

The piston rod 20 is assembled and fixed to the center of the piston 70. When the door is opened and closed, a damping force is provided by the piston rod 20, The action will be discussed later.

The rod guide 30 is fixedly coupled to the inside of the cylinder 10 to guide the movement of the piston rod 20.

Therefore, the piston rod 20 is repeatedly moved in and out of the cylinder 10 in accordance with the opening and closing operation of the door, and the oil is supplied to the piston 10 in the forward and backward directions of the piston .

The damper includes an oil seal 40 coupled to one side of the rod guide 30 to prevent leakage of gas or oil and an oil seal 40 for fixing the oil seal 40 to the rod guide 30. [ A washer B (60) assembled to one side of the piston (70) to prevent the guide stopper and the piston from being impacted during the upward stroke of the piston, and a washer An O-ring 80 which is assembled to prevent backflow of gas or oil, an O-ring 80 which is assembled to one side of the piston 70 to prevent impact between the piston rod 20 and the lower cap 100 during downward stroke, A 90 is additionally constituted.

The oil seal 40 is configured to prevent gas or oil in the cylinder from moving toward the rod guide and leaking to the outside. The guide stopper 50 fixes the rod guide 30 and the oil seal 40 to the cylinder 10 A protrusion 10c protruding inward from a part of the cylinder 10 is inserted into the groove 50a and the position of the protrusion 10c is fixed. The rod guide 30, the oil seal 40, and the guide stopper 50 are sandwiched and held in position, and then the outside of the cylinder 10 is pressed by a roller to fix the position by making the projection 10c inward do.

The washer A 60 is configured to prevent the piston 70 from directly colliding with the guide stopper 50 when moving upward by the piston rod 20. The washer A 90 prevents the piston 70 from moving downward So that it is prevented from directly colliding with the lower cap 100 during the stroke movement.

The o-ring 80 is configured to maintain the damping force of the damper by preventing gas or oil from leaking into the gap between the piston 70 and the cylinder 10. The material is made of Teflon, So that the gap between the piston 70 and the cylinder 10 is kept constant and the damping force is constantly maintained.

6, an enlarged portion 10a having a relatively large inner diameter is formed in a part of the cylinder 10 so that the piston 70 passes through the extended portion 10a The damping force of the damper is drastically lowered by rapidly increasing the flow rate.

That is, the enlarged portion 10a can be formed by machining a part of the inner diameter, which is initially made through a pipe process such as extrusion or drawing, so that the gap between the outer peripheral surface of the piston 70 and the cylinder 10 is relatively So that a relatively large amount of gas or oil is moved when the piston 70 passes through the expansion portion 10a, thereby drastically lowering the damping force of the damper.

In the case of the present invention, it is preferable that the extension portion 10a is formed on the side of the lower cap 100. When the door is closed by connecting the door to one side of the piston rod 20, ) To the second step (step 2), the damping force of the first operation is relatively high, and when the door is closed to some extent, that is, when the step 3 of FIG. 5 is reached, Lowering the speed of closing the door.

In this case, the door is closed gradually by a strong damping force until the door is closed to some extent, and the door is closed at a certain interval before the door is completely closed. However, when the door is closed to some extent, The damping force may be lowered.

On the contrary, when the door is opened as shown in step 4 of FIG. 5, a relatively low damping force acts to minimize the force required to open the door. As a result, the door can be opened at a high speed, As shown in step 5 of FIG. 5, after the door is opened to some extent, the door is opened smoothly by slowing down the door opening speed.

In addition, it is preferable that the length (1) of the extension portion is between 40 and 60% of the total length (L) of the cylinder.

That is, when the length l of the expanded portion is less than 40% of the total length L of the cylinder, the length of the expanded portion is shortened to reduce the effect of lowering the damping force, If it exceeds 60%, it is possible to secure a fast response speed, but it is difficult to secure the effect of using the damper because the section where the damping force acts is relatively small.

It is preferable that the thickness t of the expanded portion is 40 to 60% as compared with the original thickness T of the cylinder. If the thickness t of the expanded portion is less than 40% as compared with the original thickness T of the cylinder, It is difficult to obtain a damping force reduction effect due to the expansion portion.

It is more preferable that the difference between the original thickness T of the cylinder and the thickness t of the expanded portion is between 0.3 and 0.6 mm.

That is, in the case of a damper, it is necessary to maintain a certain level of thickness so as to be able to withstand the movement of the piston rod 20 and withstand the pressure of the gas or oil filled therein. In the case of a general damper, The strength of the cylinder is weakened when the difference between the original thickness T of the cylinder and the thickness t of the expanded portion exceeds 0.6 mm. On the contrary, when the difference is less than 0.3 mm, the damping force It is preferable to perform the cutting process within the above-mentioned range.

The inclined portion 10b is formed between the expanded portion 10a and the inner diameter portion of the unexpanded cylinder and the inclination angle alpha of the inclined portion 10b is 15 to 30 degrees It is preferable to have an angle between them.

In other words, the inclined portion 10b can prevent the collision noise due to the movement of the piston 70 when the piston 70 in the expanded portion 10a is moved toward the unexpanded inner diameter portion due to the upward stroke of the piston rod 20 When the inclination angle? Of the inclined portion is less than 15 占 as compared with the inner diameter face of the cylinder 10, the machined portion becomes too large to process the inclined portion, and strong pressure is applied to one portion due to trembling during cutting When the piston 70 is moved, the noise may be generated severely due to the collision when the piston 70 is moved. In addition, when the piston 70 is moved due to frequent impact, breakage of the piston and other components may easily occur. It is preferable to form the inclined portion having the angle within the above-mentioned range because the durability may be deteriorated.

FIG. 7 is a block diagram of a piston according to the present invention. The piston 70 is composed of two layers. The first layer 71 has protrusions 72 formed at regular intervals, And a through hole 75 is formed at one side of the two layered portion 73 so that the space between the protrusions 72 of the first layered portion 71 when the piston 70 is moved and the space between the two layered portions 73 Gas or oil is moved through the grooves 74 and the through holes 75 of the first and second chambers 73 and 73.

That is, the first layer 71 of the piston is formed with protrusions 72 having a helical outer surface at regular intervals to create an equally spaced space between the protrusions 72 and the O- The groove 74 of the two-layered portion 73 is also formed at equal intervals so that the gas or the oil is uniformly moved in the gap between the O-ring 80 and the first layer portion 71 of the piston The moved gas or oil is moved in the gap between the groove 74 and the cylinder 10, thereby restricting the movement of the gas or oil charged in the cylinder 10, thereby appropriately securing the damping force .

In addition, a through hole 75 is formed so as to penetrate the entire two-layered portion 73 so that a small amount of gas or oil passes directly through the piston 70, thereby minimizing the restriction of movement by o-rings or washers.

As a result, in the two-stage damper according to the present invention, a part of the cylinder in which the gas or the oil is charged is cut so that the inside diameter (inside diameter) of the cylinder is changed. When the piston reaches a predetermined section during the reciprocating motion of the piston, There is an effect that the damping force of the piston rod fixedly coupled with the piston can be drastically changed, and the inclined portion is provided between the section where the inner diameter change takes place to guide the movement of the piston by the inclined portion, The noise can be reduced and the piston rod of the damper can be fixedly coupled to the door to minimize the damping force when the door is opened so that the door can be opened at a high speed.

1. Fixed part 2. Moving part
10; Cylinder 10a. Extension portion 10b. Inclined portion
10c. spin
20. Piston rod 30. Rod guide
40. Oil seal 50. Guide stopper 50a. Groove
60. Washer B
70; piston
71. Layer 1 72. Layer 73. 2 Layer
74. Groove 75. Through hole
80. O-ring 90. Washer A
100. Lower cap

Claims (6)

A damper for absorbing an impact generated when a door is opened and closed,
The damper is formed by cutting a portion of the cylinder 10 filled with the gas or oil so that the inner diameter of the cylinder 10 is changed. When the piston 70 moves along the inside of the cylinder 10, 10, the amount of movement of the gas or oil is rapidly increased to the gap, so that the damping force is adjusted,
The damper includes a cylinder (10) filled with gas or oil, a piston (70) moving along the inside of the cylinder (10) and generating a damping force by gas or oil charged in the cylinder (10) A piston rod 20 which is assembled at the center of the piston rod 70 and which performs an operation of repeatedly entering and exiting the cylinder, a rod guide 20 fixedly coupled to the inside of the cylinder 10 and guiding the movement of the piston rod 20, (30), and a lower cap (100) for preventing gas or oil charged in the cylinder (10) from leaking to the outside,
The damper is connected to one side of the rod guide 30 to prevent oil or oil from leaking and an oil seal 40 to be fixed to one side of the oil seal 40 for fixing the rod guide 30 and the oil seal 40. [ A washer B (60) assembled to one side of the piston (70) to prevent the guide stopper and the piston from impacting during an upward stroke of the piston, and a washer An O-ring 80 for preventing reverse flow of gas or oil and a washer A (not shown) which is assembled to one side of the piston 70 to prevent impact between the piston rod 20 and the lower cap 100 during a downward stroke, 90) is additionally provided.
delete The method according to claim 1,
An expansion portion 10a having a relatively large inner diameter is formed in a part of the cylinder 10 so that the flow rate rapidly increases when the piston 70 passes the expansion portion 10a so that the damping force is rapidly reduced The two-stage damper is characterized by the fact that.
delete The method according to claim 1,
The piston 70 is composed of two layers. The first layer 71 is formed with protrusions 72 at equal intervals. The second layer 73 is formed with grooves 74 at equal intervals. A through hole 75 is formed at one side of the piston 73 so that the space between the protrusions 72 of the first layer portion 71 and the groove 74 and the through hole 75 of the two layered portion 73 when the piston 70 is moved, Wherein the gas or oil is moved through the first damper.
The method according to claim 1,
Wherein the O-ring (80) is assembled to the piston (70) to prevent backflow of gas or oil, and the material is Teflon.

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