KR20120092883A - Small-sized oil pressure damper - Google Patents

Abstract

PURPOSE: A small-sized oil pressure damper is provided to reduce manufacturing costs and ease the maintenance and opens the door of a small-sized electronic unit. CONSTITUTION: A small-sized oil pressure damper(100) comprises a housing(110), oil, a piston(130), a rod(140), a rod guide(180), an accumulator, and an elastic member(120). An opening portion is formed in the housing. The oil is filled in the housing. The piston is installed in the housing and moved back and forth. The rod is coupled with the front portion of the piston and projected through the opening. The rod guide supports rod and comprised in the opening. The accumulator is installed between the piston and the rod guide and stores oil. The elastic member is comprised in the rear portion of the piston and reduces the impact transferred through the rod.

Description

Small Hydraulic Damper {Small-sized Oil pressure damper}

The present invention relates to a damper, and more particularly, to a small hydraulic damper which is used as a hydraulic damper to smoothly operate a door in small electronics and home appliances.

Generally, dampers are divided into lever type and direct type according to their structure. Among them, the lever type is a damper of mechanically coupled structure including elastic resin, metal or spring, and small electronic products such as mobile phones, MP3 players, and notebook computers. It is used to open and close the door smoothly.

However, the lever-type danper is easily broken by external shock due to mechanical coupling, and has a problem in that it is difficult to manufacture and maintain due to a complicated structure and coupling relationship.

Similarly, the direct acting type is a piston-type hydraulic or pneumatic type, and most of the hydraulic dampers are widely used for shock prevention when opening or closing a shock absorber or door of a vehicle such as an automobile, a railroad car, an aircraft.

Here, the basic structure of the hydraulic damper is shown in FIG. The exterior of the damper is formed by a cylindrical cylinder 10 having a hollow portion open at one side, and a piston having an orifice 16 filled with a working oil 12 in the cylinder and serving as a moving passage of the oil. 14 is located. An oil seal ring 20 is provided on the outside of the piston 14 so that the oil flows only to the orifice 16. On one side of the piston 14, the oil is leaked at regular intervals from the piston. An oil seal 26 and a rod guide 28 are provided to prevent the rod 18 from being exposed to the outside of the cylinder through the oil seal 26 and the rod guide 28 from one side of the piston. Is located. Between the piston 14 and the oil seal 26, the accumulator 30, which serves to absorb and store oil leaked from the orifice of the piston, and a bush, which serves to support the accumulator 30, 24) is located. Meanwhile, a compression spring 22 is provided between the other side of the piston 14 and the inner end of the cylinder 10.

In operation of the hydraulic damper, when the external force is applied from the free end of the rod 18, the piston 14 moves to the inside of the cylinder 10 (right side in FIG. 1), the right space of the piston 14 The oil 12 filled in is compressed. Since the oil 12 is an incompressible fluid, the oil 12 flows through the orifice 16 to the left space of the piston 14 by the pressure of the piston 14. The amount of oil 12 flowing through the orifice 16 is controlled by the size and shape of the orifice, and the damper attenuates the external impact force applied to the rod 18 using the resistance of the oil 12 thus controlled. It is to be made. Oil 12 spilled from orifice 16 is stored in accumulator 30. On the contrary, when the external force is removed, the piston 14 is moved to the left side by the elastic force of the spring 22. At this time, the oil 12 stored in the accumulator 30 is again returned through the orifice 16. Flows to the right space of.

The hydraulic damper operated in this way acts as a buffer in response to external shocks by the size, shape of the orifice or the viscosity of the oil.

The hydraulic damper has a simple structure and can maintain a long-term buffering force even under a strong external shock, but has a problem that it is difficult to apply to a small electronic product due to its large size.

The present invention is to overcome the above-mentioned conventional problems, the object of the present invention is to open and close the door of small electronic products such as mobile phones, MP3 players, notebooks smoothly, as well as not easily damaged by external impact, the production cost is low To provide a small hydraulic damper that is easy to maintain.

In order to achieve the above object, the present invention provides a cylindrical housing (110) formed with an opening (111) on one side; An oil (12) filled in the housing (110); A piston 130 provided inside the housing 110 and movable in the front-rear direction; A rod (140) coupled to the front surface of the piston (130) and protruding toward the opening portion (111), the rod (140) being retractable from the housing (110) by the piston (130); A rod guide 180 provided at the opening 111 to support the rod 140; It is provided between the piston 130 and the rod guide 180, the accumulator 160 for adsorbing and storing the oil 12, and is provided in the rear of the piston 130, the rod 140 In the small hydraulic damper 100 composed of an elastic member 120 to attenuate the shock transmitted from,

A first passage 115 formed in the front and rear around the piston 130 and a first passage 134 formed in the piston 130 so that oil 12 flows between the second chamber 116; A support in which the accumulator 160 is built in an open cylindrical shape on one side thereof and a second flow passage 154 is formed on the opposite side so that the oil 12 flows between the second chamber 116 and the accumulator 160. It is to provide a small hydraulic damper, characterized in that consisting of (150).

In this case, the first flow path 134 is a flow path groove 134a is formed on the edge of the piston 130, the piston 130 is characterized in that formed of a urethane material.

In addition, the first passage 134 is formed with a passage hole 134b penetrating the front and rear surfaces of the piston 130, the piston 130 has a seating groove 138 is formed on the outer peripheral surface along the rim, It is characterized in that the sealing O-ring 136 is seated in the seating groove 138.

Here, the first passage 134 and the second passage 154 is characterized in that formed in one or more, is installed between the accumulator 160 and the rod guide 180, the oil 12 is An oil seal 170 is further provided to prevent the housing 110 from leaking out. A caulking portion 112 is formed around the opening 111, and the rod guide 180 is disposed in the housing. The caulking unit 112 is bent inward so as not to be separated to the outside of the 110 to finish.

As described above, the small hydraulic damper according to the present invention smoothly opens and closes the doors of small electronic products such as mobile phones, MP3 players, and notebooks, and is not easily damaged by external shocks, and is inexpensive to manufacture and easy to maintain. There is one advantage.

1 is a cross-sectional view of a hydraulic damper according to the prior art
Figure 2 is a partial cutaway perspective view showing a combined state of the small hydraulic damper according to the present invention
3 is an exploded perspective view of a small hydraulic damper according to the present invention;
Figure 4 is another embodiment operating state diagram according to the present invention
5 is an exploded perspective view of another embodiment of the present invention.
6 is a state diagram used in the small hydraulic damper of the present invention

With reference to the accompanying drawings, a small hydraulic damper according to the present invention will be understood by the embodiments described in detail below.

Small hydraulic damper according to the present invention comprises a cylindrical housing 110, the opening portion 111 is formed on one side; An oil (12) filled in the housing (110); A piston 130 provided inside the housing 110 and movable in the front-rear direction; A rod (140) coupled to the front surface of the piston (130) and protruding toward the opening portion (111), the rod (140) being retractable from the housing (110) by the piston (130); A rod guide 180 provided at the opening 111 to support the rod 140; It is provided between the piston 130 and the rod guide 180, the accumulator 160 for adsorbing and storing the oil 12, and is provided in the rear of the piston 130, the rod 140 In the small hydraulic damper 100 composed of an elastic member 120 to attenuate the shock transmitted from,

A first passage 115 formed in the front and rear around the piston 130 and a first passage 134 formed in the piston 130 so that oil 12 flows between the second chamber 116; A support in which the accumulator 160 is built in an open cylindrical shape on one side thereof and a second flow passage 154 is formed on the opposite side so that the oil 12 flows between the second chamber 116 and the accumulator 160. It consists of 150.

In this case, the first flow path 134 is formed with a flow path groove 134a on the edge of the piston 130, the piston 130 is formed of a urethane material.

In addition, the first passage 134 is formed with a passage hole 134b penetrating the front and rear surfaces of the piston 130, the piston 130 is formed with a seating groove 138 on the outer peripheral surface along the rim, The sealing O-ring 136 is seated in the seating groove 138.

Here, the first passage 134 and the second passage 154 is formed in one or more, is installed between the accumulator 160 and the rod guide 180, the oil 12 is the housing 110 Oil seal 170 is further provided to prevent the outflow to the outside.

A caulking portion 112 is formed around the opening 111, and the caulking portion 112 is bent inward so that the rod guide 180 is not separated out of the housing 110. Configure.

Referring to the configuration of the small hydraulic damper according to the present invention in detail as follows.

As shown in Figure 2, 3, provided with a cylindrical housing 110, the opening portion 111 is formed on one side, the first engaging portion 113 and the inner side 112 of the opening 111 side stepwise. , The second locking portion 114 is formed.

Here, the elastic member 120 is inserted into the housing 110.

In this case, it is preferable that the elastic member 120 uses a janggo-type compression spring having a narrower outer diameter at the end than the outer diameter of the central portion.

This maximizes the compression ratio of the spring by using the high compression spring, thereby minimizing the space of the spring, it is possible to relatively reduce the length of the housing (110).

Next, the piston 130 is inserted in close contact with the elastic member (hereinafter referred to as a spring) 120 provided inside the housing 110.

At this time, the piston 130 is formed with a fitting hole 132, the rod 140 is fitted on one side, the oil 12 flows between the first chamber 115 and the second chamber 116. The first passage 134 is formed to be able to.

Here, the first passage 134 is formed with a flow path groove 134a on the edge of the piston 130, the piston 130 is formed of a urethane material.

In another embodiment, as shown in FIG. 5, the first passage 134 is formed with a passage hole 134b penetrating the front and rear surfaces of the piston 130, and the piston 130 is formed along an edge. A seating groove 138 is formed on the outer circumferential surface, and a sealing O-ring 136 is seated in the seating groove 138.

Here, the oil 12 filled in the interior of the housing 110 through the first flow passage 134 flows between the first chamber 115 and the second chamber 116, the amount of passage of the oil 12 Since the compression ratio is determined according to the first flow path 134, at least one or more pieces are selectively formed.

Next, the rod 140 is coupled to the fitting hole 132 formed in the piston 130, and a coupling groove 142 is formed at a portion at which the rod 140 is coupled, and the inner side of the fitting hole 132 is formed. The fitting protrusion 133 corresponding to the coupling groove 142 is formed.

This is to prevent the user from easily detaching even when the user is forced to pull out the rod 140.

Next, a support having a cylindrical shape with one side open, a first through hole 152 through which the rod 140 penetrates, and a second flow path 154 through which oil can pass. Insert 150 into the housing 110, the surface formed with the first through hole 152 is positioned to be seated in the first catching portion (113).

In this case, a cylindrical accumulator 160 having a second through hole 162 through which the rod 140 penetrates is inserted into the support 150.

The accumulator 160 absorbs and stores the oil 12 as a resin material having high adsorption such as a sponge.

At this time, the oil 12 is filled in the space where the accumulator 160 and the piston 130 are located.

Next, the oil seal 170 is coupled to the inner side along the opening 111 of the housing 110, but a third through hole 172 is formed to penetrate the rod 140, and one of the oil seals 170 is formed. A side is seated on the second catching part 114.

In this case, the oil seal 170 prevents the oil 12 stored in the accumulator 160 from leaking to the outside.

Next, the rod 140 coupled through the movement of the piston 130 by coupling the rod guide 180 formed with a guide hole 182 so that the rod 140 penetrates and is exposed to the outside of the housing 110. It is provided to be sunk from the outside of the housing 110.

Finally, after the rod guide 180 is coupled, the caulking unit 112 is formed around the opening 111 of the housing 110 to bend the caulking unit 112 toward the rod guide 180 in a state where the coupling is completed. To make a small hydraulic damper.

By the above configuration, the small hydraulic damper according to the present invention is operated as follows.

As shown in FIG. 4A, when a shock is applied to the right portion of the rod 140, the piston 130 in close contact with the spring 120 pressurizes the spring 120. At this time, the first chamber 115 on the left side of the piston 130 is referred to as the second chamber 116 on the right side. The oil in the first chamber 115 through the oil hole 134 formed in the piston 130, such as (b), (C), while primarily damping the impact by the spring 120 is supported. The oil 12 is stored in the accumulator 160 while the 12 moves to the second chamber 116.

In this case, when the oil 12 moves through the oil hole 134, oil resistance is generated by the property of the oil 12 to reduce the impact speed applied to the rod 140.

As shown in (d), when the shock applied to the rod 140 is released, the piston 130 is pushed to the right by the supported spring 120, and the second storage chamber 116 and the accumulator ( As the oil 12 stored in the 160 moves to the first storage chamber 115 through the oil hole 134, the rod 140 is pushed to the right to return to the original position.

Hereinafter, as shown in FIG. 6 of the present invention, the impact of the door 2 generated by the user is coupled to the door 2 of a small electronic product such as a mobile phone 1, an MP3 player, and a notebook computer. The electronic device can be used for a long time so as not to be transmitted, and the door 2 can be smoothly opened and closed, as well as not easily damaged by external impact, and the manufacturing cost is low and maintenance is easy.

As described above, embodiments of the present invention have been described in detail, but the scope of the present invention is not limited thereto, and the scope of the present invention extends to the range substantially equivalent to the embodiments of the present invention.

110: Housing
120: elastic member
130: piston
140: load
150: support
160: accumulator
170: oil seal
180: road guide

Claims (8)

A cylindrical housing 110 having an opening 111 formed at one side thereof; An oil (12) filled in the housing (110); A piston 130 provided inside the housing 110 and movable in the front-rear direction; A rod (140) coupled to the front surface of the piston (130) and protruding toward the opening portion (111), the rod (140) being retractable from the housing (110) by the piston (130); A rod guide 180 provided at the opening 111 to support the rod 140; An accumulator (160) provided between the piston (130) and the rod guide (180) for adsorbing and storing the oil (12); In the small hydraulic damper 100 provided at the rear of the piston 130, consisting of an elastic member 120 to attenuate the shock transmitted from the rod 140,
A first passage 115 formed in the front and rear around the piston 130 and a first passage 134 formed in the piston 130 so that oil 12 flows between the second chamber 116;
A support in which the accumulator 160 is built in an open cylindrical shape on one side thereof and a second flow passage 154 is formed on the opposite side so that the oil 12 flows between the second chamber 116 and the accumulator 160. Small hydraulic damper, characterized in that consisting of (150).
The method of claim 1,
The first passage 134 is a small hydraulic damper, characterized in that the flow path groove (134a) is formed on the edge of the piston (130).
The method of claim 2,
The piston 130 is a small hydraulic damper, characterized in that formed of urethane material.
The method of claim 1,
The first flow passage 134 is a small hydraulic damper, characterized in that the passage hole (134b) is formed through the front and rear surfaces of the piston (130).
The method of claim 4, wherein
The piston 130 is a small hydraulic damper, characterized in that the seating groove 138 is formed on the outer peripheral surface along the rim, the sealing O-ring 136 is seated in the seating groove 138.
The method of claim 1,
Small hydraulic damper, characterized in that the first passage 134 and the second passage 154 is formed in one or more
The method of claim 1,
A small hydraulic damper is installed between the accumulator 160 and the rod guide 180, and further includes an oil seal 170 that prevents the oil 12 from flowing out of the housing 110. .
The method of claim 1,
A caulking part 112 is formed around the opening part 111, and the caulking part 112 is bent inward so that the rod guide 180 is not separated out of the housing 110. Compact hydraulic damper.

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