KR20110080493A

KR20110080493A - Piston ring assembly

Info

Publication number: KR20110080493A
Application number: KR1020100000747A
Authority: KR
Inventors: 박상기
Original assignee: 박상기
Priority date: 2010-01-06
Filing date: 2010-01-06
Publication date: 2011-07-13

Abstract

The present invention relates to a piston ring assembly, comprising an oil-filled cylinder body (C), and a piston rod (R) that emerges from the cylinder body (C) by a piston (P) slid by hydraulic pressure inside the body. As applied to the hydraulic cylinder, as being in close contact with the outer circumferential surface of the flexible main ring 10 installed on the outer circumferential surface of the piston (P), both ends are incised, and formed on one side end of the cut, the first stepped portion ( 21 and a second step portion 22 formed at the other end of the incision and engaged with the first step portion 21, the seal 20 being in close contact with the inner circumferential surface of the cylinder body C; It is disposed on both sides of the flexible main ring 10 to prevent the sealing 20 from being separated from the flexible main ring 10, and a pair of separation prevention rings having a cut end 30a having an incline cut at both ends is formed. 30; And it is installed in an annular to the separation prevention ring 30, the magnet ring 40 for adsorbing the powder contained in the oil; characterized in that it comprises a.

Description

Piston ring assembly

The present invention relates to a piston ring assembly for smoothly guiding the sliding of the piston is coupled to the outer peripheral surface of the piston.

In general, a hydraulic cylinder used in construction equipment, such as an excavator, is composed of an oil-filled cylinder body and a piston rod that is released by the piston slid by the hydraulic pressure inside the body. At this time, the outer peripheral surface of the piston serves to shield the hydraulic pressure applied from the left and right sides of the Teflon ring for smoothly guiding the sliding of the piston is installed. Since the Teflon ring is in close contact with the inner circumferential surface of the cylinder body during the reciprocating movement of the piston, it is damaged when the hydraulic cylinder is used for a long time, and thus the Teflon ring should be replaced by disassembling the hydraulic cylinder periodically.

By the way, the Teflon ring has to be precisely machined to shield the hydraulic pressure applied to the left and right sides of the piston, the machining process is performed manually by hand and excessive processing costs are inevitably implemented to be expensive. As a result, regular maintenance of the Teflon ring was incurred.

In addition, over time, powder that is separated from the cylinder body or powder that is introduced from the outside during the replacement of the seal is mixed with oil, and this powder damages the inner circumferential surface of the cylinder body and eventually causes the hydraulic cylinder to break down. It became.

The present invention has been made to solve the above problems, it is to provide a piston ring assembly that can be implemented at low cost by mass production using injection.

Another object of the present invention is to provide a piston ring assembly that can prevent the inner circumferential surface of the cylinder body from being damaged by attaching powder to be mixed in oil over time.

Still another object of the present invention is to provide a piston ring assembly applicable to cylinder bodies of various inner diameters.

In order to achieve the above object, the piston ring assembly according to the present invention,

Applied to a hydraulic cylinder consisting of a cylinder body (C) filled with oil, and a piston rod (R) that emerges from the cylinder body (C) by a piston (P) slid by hydraulic pressure in the cylinder body (C). As being in close contact with the outer circumferential surface of the flexible main ring 10 installed on the outer circumferential surface of the piston (P), both ends are incised, and are formed on one side end of the cut and the stepped portion 21 is formed stepwise. And a second step portion 22 formed on the other end of the cut portion and engaged with the first step portion 21, and the sealing 20 being in close contact with the inner circumferential surface of the cylinder body C; Is disposed on both sides of the flexible main ring 10 to prevent the sealing 20 from being separated from the flexible main ring 10, a pair of cut ends (30a) formed by cutting both sides obliquely Separation prevention ring 30; And a magnet ring 40 which is installed in an annular shape to the separation prevention ring 30 and for adsorbing the fine powder contained in the oil.

In the present invention, in the sealing 20, the contact surface of the first step portion 21 and the second step portion 22 is formed with a plurality of uneven surface (21a) (22a) formed with a plurality of uneven ) Is formed.

In the present invention, the contact surface of the cut end (30a) is formed with a concave-convex surface (30b) formed with a plurality of concave-convex (치) to be mutually engaged.

In the present invention, the sealing 20 is implemented by mixing 0.3 to 10 parts by weight of molybdenum based on 100 parts by weight of nylon glass.

According to the piston ring assembly according to the present invention, since the seal and the separation prevention ring constituting it is manufactured by injection, it is possible to mass production to reduce the manufacturing cost, and thus in the process of disassembling the hydraulic cylinder to replace the piston ring assembly Maintenance costs can be reduced.

In addition, since both ends of the sealing and the separation prevention ring is cut and engaged, the sealing and separation prevention ring of the present application can be employed for cylinder bodies of various inner diameters.

And as time goes by, the powder that is mixed in the oil can be attached to prevent the inner circumference of the cylinder body from being damaged.

1 is a view illustrating a state in which a piston ring assembly according to the present invention is installed on an outer circumferential surface of a piston inside a cylinder body;
2 is a partially exploded perspective view of the piston ring assembly of FIG. 1, FIG.
3 is a cross-sectional view of the piston ring assembly of FIG.

Hereinafter, the piston ring assembly according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a view illustrating a state in which a piston ring assembly according to the present invention is installed on an outer circumferential surface of a piston inside a cylinder body, FIG. 2 is a partially exploded perspective view of the piston ring assembly of FIG. 1, and FIG. 3 is a piston of FIG. 2. Cross section of the ring assembly.

As shown, the piston ring assembly according to the present invention, the oil is filled in the cylinder body (C) and is released from the cylinder body (C) by the piston (P) sliding by hydraulic pressure inside the cylinder body (C) It is applied to a hydraulic cylinder composed of a piston rod (R). The piston ring assembly, the seal 20 is in close contact with the outer circumferential surface of the flexible main ring 10 installed on the outer circumferential surface of the piston (P), and the seal 20 in close contact with the inner circumferential surface of the cylinder body (C); It is disposed on both sides of the flexible main ring 10 to prevent the sealing 20 from being separated from the flexible main ring 10, and a pair of separation prevention rings having a cut end 30a having an incline cut at both ends is formed. 30; It is installed in an annular ring to the separation prevention ring 30, the magnet ring 40 for adsorbing the powder contained in the oil; characterized in that it comprises a.

The flexible main ring 10 is made of a flexible material such as synthetic rubber, and a pair of annular steps 11 are formed at both sides thereof. Each of the annular step 11 is fitted with a separation prevention ring 30 to be described later.

The sealing 20 is cut at both ends and formed on one side end of the incision, and is formed at the stepped first step portion 21 and the second stepped on the first stepped portion 21 as formed at the other end cut off. And a stepped portion 22.

The first stepped portion 21 and the second stepped portion 22 have a "b" shape and a "b" shape when they are viewed from the side so as to form the same thickness as other portions when they are engaged with each other. Therefore, even when the first stepped part 21 and the second stepped part 22 are slightly open, the first stepped part 21 and the second stepped part 22 can maintain the engaged state, and thus the piston P ) The hydraulic pressure applied from the left and right sides can be shielded.

In addition, the contact surface between the first stepped portion 21 and the second stepped portion 22 is formed with uneven surfaces 21a and 22a in which a plurality of unevennesses which are engaged with each other are formed. The uneven surfaces 21a and 22a allow the diameter of the seal 20 to be constantly maintained in a state where the first stepped portion 21 and the second stepped portion 22 are engaged with each other.

This is technically important. That is, when the outer circumferential surface of the sealing 20 is worn out by friction, the first step portion 21 and the second step portion 22 are spaced apart, but the first and second step portions 21 and 22 are separated from each other. Even in the open state, the first and second stepped portions 21 and 22 are engaged by the uneven surfaces 21a and 22a at a specific position, so that the overall diameter of the seal 20 is kept constant. do. In this way, the diameter of the seal 20 is kept constant, the oil pressure is always constant to the oil applied to the piston (P) can be precisely controlled. That is, even if the outer circumferential surface of the sealing 20 is worn down over time, the uneven surface 21a, 22a of the specific position is maintained in a mutually engaged state, and eventually the diameter of the outer circumferential surface of the sealing 20 becomes constant, Thereby, even if time passes, constant repetition control of the piston P by hydraulic application is possible.

Furthermore, even if the inner diameter of the cylinder body C is not the same as the diameter formed by the seal 20, the seal 20 can shield the hydraulic pressure applied to the left and right sides of the piston P in the cylinder body C. Therefore, the sealing 20 of this application can be employ | adopted universally to the cylinder main body C of various inner diameters.

The seal 20 is produced by injection or molding using a mold. In order to enable this, the sealing 20 is implemented by mixing 0.3 to 10 parts by weight of molybdenum based on 100 parts by weight of nylon glass. When 0.3 parts by weight or less of molybdenum is mixed, the seal 20 is difficult to exhibit sufficient durability, and when molybdenum is 10 parts by weight or more, the lubricity is deteriorated. In the present embodiment, the sealing 20 is implemented by mixing 5 parts by weight of molybdenum based on 100 parts by weight of nylon glass. Since the seal 20 is manufactured by injection or molding in this way, the necessity of processing the surface precisely can be eliminated, and the manufacturing cost is significantly lowered.

The separation prevention ring 30 prevents the sealing 20 from being separated from the flexible main ring 10 by hydraulic pressure applied in a state in which it is fitted to the annular step 11 on both sides of the flexible main ring 10. do. At both ends of the separation prevention ring 30 is formed an inclined end (30a) is formed obliquely.

In addition, the contact surface of the cut-out end (30a) is formed with a concave-convex surface (30b) is formed with a plurality of concavities and convex (상호) to be mutually engaged. The uneven surface 30b allows the diameter of the separation prevention ring 30 to be constantly maintained in a state where the cut ends 30a of both ends are engaged.

This too has technical significance. Even if the diameter of the annular step 11 formed in the flexible main ring 10 is slightly larger or smaller due to the two inclined ends 30a formed at an angle and the uneven surface 30b formed at both of the cut ends 30a, Alternatively, even if the inner circumferential surface of the cylinder body C is slightly larger or smaller, the separation prevention ring 30 may maintain a ring shape having a specific diameter while being slightly opened or eroded. That is, the separation prevention ring 30 of the present application is also applicable to the flexible mailing 10 or the cylinder body (C) of various standards.

The magnet ring 40 is annular as a whole and is integrally installed in the separation prevention ring 30, and the magnet ring 40 is manufactured separately and then integrated when forming the separation prevention ring 30.

As the hydraulic cylinder is operated for a long time, powder that is separated from the cylinder body C or powder that is introduced from the outside in the process of replacing the seal 20 is mixed with oil. Such fine powder generates fine grooves on the inner circumferential surface of the cylinder body C or damages the outer circumferential surface of the seal 20 to prevent the oil pressure from being completely applied to the piston P.

The magnet ring 40 of the present application is attached to remove the powder to be mixed in the oil. As described above, the magnet ring 40 may be attached to and removed from the powder mixed in oil to prevent the inner circumferential surface of the cylinder body C from being damaged, thereby extending the life of the hydraulic cylinder or the piston ring assembly.

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom.

10 ... flexible main ring 11 ... annular step
20 ... sealing 20a ... recessed
21, 22 ... 1st, 2nd step 21a, 22a ... uneven surface
30 ... disconnection prevention ring 30a ..
30b ... uneven surface 40 ... magnet ring

Claims

Applied to a hydraulic cylinder consisting of a cylinder body (C) filled with oil, and a piston rod (R) that emerges from the cylinder body (C) by a piston (P) slid by hydraulic pressure in the cylinder body (C). As it becomes,
As being in close contact with the outer circumferential surface of the flexible main ring 10 installed on the outer circumferential surface of the piston (P), both ends are incised, and are formed on one side end of the incision, and the first stepped portion 21 is formed stepwise, and A seal 20 formed at the other end and including a second step portion 22 engaged with the first step portion 21 and in close contact with the inner circumferential surface of the cylinder body C;
Is disposed on both sides of the flexible main ring 10 to prevent the sealing 20 from being separated from the flexible main ring 10, a pair of cut ends (30a) formed by cutting both sides obliquely Separation prevention ring 30; And
Piston ring assembly comprising a; is installed in the annular ring to the separation prevention ring (30), the magnet ring (40) for adsorbing the powder contained in the oil.

The method of claim 1, wherein in the seal (20),
And a concave-convex surface (21a) (22a) having a plurality of concavities and convexities formed therebetween in contact with the first stepped portion (21) and the second stepped portion (22).

The method of claim 1,
Piston ring assembly, characterized in that the contact surface of the cut end (30a) is formed with a plurality of concave-convex (30) is formed to engage with each other.

The method of claim 1,
The seal 20 is a piston ring assembly, characterized in that the molybdenum is mixed with 0.3 to 10 parts by weight based on 100 parts by weight of nylon glass.