KR20020006840A

KR20020006840A - an oil sealing structure for mechanical device having an axis of rotation

Info

Publication number: KR20020006840A
Application number: KR1020000040291A
Authority: KR
Inventors: 최정익
Original assignee: 류정열; 기아자동차주식회사
Priority date: 2000-07-13
Filing date: 2000-07-13
Publication date: 2002-01-26

Abstract

PURPOSE: An oil leakage preventing structure of a machine having a rotation shaft is provided to extend the lifespan of the oil seal and the airtightness of the machine for keeping the optimum state for a long time without any oil leakage, thereby preventing the damage of gears and improving the performance of the machine. CONSTITUTION: An oil leakage preventing structure of a machine having a rotation shaft includes an oil seal(3) formed with a main rib(3a) and an auxiliary rib(3b) between a main body(1) of the machine and the rotation shaft(2) for contacting a rotation shaft(2), and a hollow fastening ring(5) surrounding an outer circumference, wherein a second main rib(3c) is formed behind the main rib with an inner diameter larger than the main rib.

Description

An oil sealing structure for mechanical device having an axis of rotation}

본 발명은 회전축이 있는 기계장치의 오일누출 방지구조에 관한 것으로, 특히 오일시일 자체의 누유방지력이 향상되고 수명이 연장됨은 물론, 가열되었을 때 누유방지력이 보다 향상될 수 있도록 된 회전축이 있는 기계장치의 오일누출 방지구조에 관한 것이다.The present invention relates to an oil leakage preventing structure of a mechanical device having a rotating shaft, and in particular, the oil leakage itself is improved in preventing leakage and extending its life, as well as having a rotating shaft to improve the leakage preventing force when heated. An oil leak prevention structure of a mechanical device.

일반적으로 회전축을 갖춘 기계장치는--이 회전축이 기계내부에서 발생된 동력을 외부로 전달하는 것이든, 외부에서 전해지는 힘을 기계내측으로 전달하는 것이든, 단지 전달되는 힘의 방향이나 크기를 변환시켜 다시 외측으로 전달하는 것이든 간에--기계몸체의 내부에 윤활과 냉각을 위한 오일이 주입되어 있는 경우가 대부분이며, 기계의 몸체와 회전축 접촉부 사이의 틈새로 상기 오일이 누출되지 않도록 오일누출 방지구조가 적용되어 있다.In general, a machine with a rotating shaft--whether the rotating shaft transmits the power generated from the inside of the machine to the outside, or the externally transmitted force to the inside of the machine, simply changes the direction or magnitude of the transmitted force. Whether it is converted and transferred to the outside--oil is often injected into the body of the machine for lubrication and cooling, and oil leaks do not leak through the gap between the body of the machine and the shaft contact. Prevention structure is applied.

종래의 오일누출 방지구조는 도 2에 도시된 바와 같이, 기계의 몸체(1)와 회전축(2)의 사이에 고무재질의 오일시일(3)이 삽입되되, 이 오일시일(3)의 외측은 일단이 상기 몸체(1)에 끼워진 고정캡(4)에 의해 고정되고, 내측에는 오일시일(3)을 둘러싸는 중공의 링인 조임링(5)이 구비되며, 상기 오일시일(3)의 기계내측 단부에 메인립(3a)이 형성되고 기계외측 단부에 보조립(3b)이 형성되어, 이 메인립(3a)과 보조립(3b)이 회전축의 외주표면에 밀착됨으로써 기계 몸체(1) 내부의 오일이 외부로 흘러나오지 못하도록 된 구조로 되어 있었다.In the conventional oil leakage prevention structure, as shown in FIG. 2, a rubber oil seal 3 is inserted between the body 1 and the rotating shaft 2 of the machine, and the outside of the oil seal 3 One end is fixed by a fixing cap (4) fitted to the body (1), the inner ring is provided with a fastening ring (5), which is a hollow ring surrounding the oil seal (3), the inside of the machine of the oil seal (3) The main lip 3a is formed at the end and the auxiliary lip 3b is formed at the outer end of the machine, and the main lip 3a and the auxiliary lip 3b are brought into close contact with the outer circumferential surface of the rotating shaft. It was structured to prevent oil from flowing out.

그러나, 상기 오일시일(3)은 고무재질이기 때문에 회전축(2)과의 끊임없는 마찰에 의해 마모되어 어느 정도 시간이 지나면 메인립(3a)과 보조립(3b)이 마모되어 틈새가 형성되며, 이 틈으로 오일이 누유되어진다.However, since the oil seal 3 is made of rubber, the main seal 3a and the auxiliary lip 3b are worn out after a certain time by the friction with the rotational shaft 2, thereby forming a gap. The oil leaks through this gap.

이에 상기 오일시일(3)의 고무재질을 더욱 내마모성이 강한 재질로 개발하였으나 가격이 고가이어서 실제 적용에는 곤란함이 많고, 또한 내마모성이 향상되었다고는 하나 그 견디는 시간을 약간 연장할뿐 비용증가량과 대비하여 볼 때 그리효율적이지는 않았다.Therefore, the rubber material of the oil seal (3) was developed as a more wear-resistant material, but the price is high, so it is difficult to apply practically, and the wear resistance is improved, but the wear resistance is improved, but the endurance time is only slightly extended, and the cost is increased. Not so efficient.

한편, 오일시일(3)의 외주부를 둘러싸서 오일시일(3)의 위치고정을 안정적으로 해주고 오일시일(3)을 회전축(2) 쪽으로 조여줌으로써 메인립(3a)의 접촉성을 증가시켜주는 상기 조임링(5)은 기계작동으로 인한 가열상태에서 팽창되어 원래의 역할인 오일시일(3)을 조여주는 기능을 제대로 수행하지 못하며, 이러한 상태에서 가열된 오일은 점도가 저하되어 더욱 누유가 발생하기 쉬운 상태가 되는 문제점이 있었다.On the other hand, the position surrounding the outer periphery of the oil seal (3) to stabilize the position of the oil seal (3) and tighten the oil seal (3) toward the rotation axis (2) to increase the contact of the main lip (3a) Fastening ring (5) is expanded in the heating state due to the mechanical operation does not properly perform the function of tightening the original role of the oil seal (3), the heated oil in such a state that the viscosity is lowered to cause more oil leakage There was a problem of becoming easy.

이에 본 발명은 상기와 같은 문제점들을 해결하기 위해 발명된 것으로서, 메인립이 마모되어도 오일시일의 누유방지력이 저하되지 않고, 또한 가열상태에서 상기 조임링이 더욱 효과적으로 오일시일을 회전축쪽으로 밀어줄 수 있게 됨으로써 오일시일의 수명이 연장됨은 물론 보다 기밀성이 우수해진 회전축이 있는 기계장치의 오일누출 방지구조를 제공함에 그 목적이 있다.Accordingly, the present invention has been invented to solve the above problems, and even if the main lip is worn, the oil leakage preventing force of the oil seal is not lowered, and the tightening ring can more effectively push the oil seal toward the rotating shaft in a heated state. The purpose of the present invention is to provide an oil leakage preventing structure of a mechanical device having a rotating shaft that has an excellent airtightness as well as extending the life of the oil seal.

도 1은 본 발명에 따른 오일누출 방지구조가 적용된 회전축이 있는 기계장치의 부분 단면도,1 is a partial cross-sectional view of a mechanical device having a rotating shaft to which the oil leakage prevention structure according to the present invention is applied;

도 2는 종래 기술에 따른 오일누출 방지구조가 적용된 회전축이 있는 기계장치의 부분 단면도이다.2 is a partial cross-sectional view of a mechanical device with a rotating shaft to which the oil leakage preventing structure according to the prior art is applied.

-도면의 주요부분에 대한 부호의 설명-Explanation of symbols on the main parts of the drawing

1 : 몸체, 2 : 회전축,1 body, 2 rotation axis,

3 : 오일시일, 3a : 메인립,3: oil seal, 3a: main lip,

3b : 보조립, 3c : 2차 메인립,3b: secondary lip, 3c: secondary main lip,

4 : 고정캡, 5 : 조임링.4: fixing cap, 5: tightening ring.

상기와 같은 목적을 달성하기 위한 본 발명은, 기계의 몸체와 회전축 사이에 끼워진 오일시일의 메인립 뒤쪽에 2차 메인립이 형성되고, 오일시일의 외측을 둘러싼 조임링이 절개부가 있는 형상기억합금으로 이루어진 구조로 되어 있다.According to the present invention for achieving the above object, the secondary main lip is formed on the back of the main lip of the oil seal sandwiched between the body of the machine and the rotating shaft, the shape memory alloy having a cut-out of the tightening ring surrounding the outside of the oil seal It consists of a structure.

따라서, 메인립이 마모되어도 2차 메인립이 시일작용을 하게 되고, 온도 상승시에 조임링이 내측으로 조여들게 됨으로써 기밀성이 더욱 향상되도록 된 것이다.Therefore, even if the main lip wears, the secondary main lip is sealed, and the tightening ring is tightened inward when the temperature rises, so that the airtightness is further improved.

이하, 본 발명을 첨부된 예시도면을 참조하여 상세히 설명한다.Hereinafter, with reference to the accompanying drawings, the present invention will be described in detail.

도 1은 본 발명에 따른 오일누출 방지구조가 적용된 회전축이 있는 기계장치의 부분 단면도로서, 본 발명은 기계의 몸체(1)와 회전축(2)의 사이에 오일시일(3)이 끼워지되, 이 오일시일(3)은 일단이 몸체(1)에 끼워져 있는 고정캡(4)에 의해 외측이 고정되고, 내측은 외주부를 둘러싸고 있는 중공형 조임링(5)에 의해 회전축(2) 쪽으로 조여져 있으며, 상기 오일시일(3)의 내외측 단부에는 각각 회전축(2)에 밀착되는 메인립(3a)과 보조립(3b)이 형성되어 있는 오일누출 방지구조에 있어서, 상기 메인립(3a)의 뒤쪽(기계전체적으로 보아서는 메인립의 외측에 해당되며, 오일의 누출방향으로 보아 메인립의 뒤쪽이다.)에 메인립(3a)과 동일한 형상의 2차 메인립(3c)이 형성되고, 상기 조임링(5)은 형상기억합금으로 제작된 것을 특징으로 한다.1 is a partial cross-sectional view of a mechanical device having a rotating shaft to which the oil leakage preventing structure according to the present invention is applied, the present invention is an oil seal (3) is inserted between the body (1) and the rotating shaft (2) of the machine, The oil seal 3 is fixed to the outer side by a fixed cap 4 having one end fitted to the body 1, and the inner side thereof is tightened toward the rotation shaft 2 by a hollow fastening ring 5 surrounding the outer circumference. In the oil leakage preventing structure in which the main lip 3a and the auxiliary lip 3b are formed on the inner and outer ends of the oil seal 3, respectively, in close contact with the rotating shaft 2, the rear side of the main lip 3a ( Secondary main lip 3c having the same shape as the main lip 3a is formed on the outside of the main lip as viewed from the whole machine, and is the back of the main lip in the oil leakage direction. 5) is made of a shape memory alloy.

여기서, 상기 2차 메인립(3c)은 메인립(3a)에 비해 다소 큰 내경--부분단면도상에서는 길이가 짧은 것으로 표현된다, 내경차이 α로 표시됨.--으로 형성되고, 상기 조임링(5)은 가열상태에서 축소된 형상을 기억시킨 것이며, 원활한 수축과 팽창이 이루어지도록 단면에서 반경방향의 일부가 절개된 형상으로 되어 있다.Here, the secondary main lip (3c) is formed of a somewhat larger inner diameter than the main lip (3a) in the cross-sectional view is represented as a short, the inner diameter difference is represented by α, and the tightening ring (5) ) Is a shape in which the shape is reduced in the heating state, and a part of the radial direction is cut out in the cross section so as to smoothly contract and expand.

따라서, 회전축(2)과의 마찰에 의해 메인립(3a)이 마모되어 그 기능을 상실할 때부터 2차 메인립(3c)이 회전축(2)에 접촉되기 시작하여 시일기능을 수행하므로 오일시일(3)의 수명이 최소한 2배 연장되어 지며, 기계작동시의 발열로 장치가 가열되면 상기 조임링(5)이 기억된 형상 즉, 내경이 축소되는 방향으로 변형되면서 오일시일(3)을 조여 메인립(3a)과 2차 메인립(3c)이 보다 강하게 회전축(2)에 밀착됨으로써 누유방지력이 향상된다.Therefore, since the main lip 3a is worn out due to friction with the rotating shaft 2 and loses its function, the secondary main lip 3c begins to contact the rotating shaft 2 to perform a sealing function, thereby providing an oil seal. The service life of (3) is extended at least twice, and when the device is heated by the heat generated during the operation of the machine, the tightening ring 5 is deformed in a memorized shape, that is, the direction in which the inner diameter is reduced, and tighten the oil seal 3. Since the main lip 3a and the secondary main lip 3c are in close contact with the rotation shaft 2 more strongly, the leakage preventing force is improved.

이상 설명한 바와 같이 본 발명에 따르면, 오일시일의 수명이 연장되고 기계장치의 기밀성이 우수해지므로 오일이 누유되지 않는 상태가 최적으로 오랫동안 유지되는 장점이 있으며, 아울러 오일누유방지로 인해 기계장치의 내부에 설치된 기어류의 소착 및 파손등이 방지되어 기계 자체의 원활한 작동과 수명연장을 꾀할 수 있게 되는 효과가 있다.As described above, according to the present invention, since the oil seal life is extended and the airtightness of the machine is excellent, there is an advantage that the oil is not leaked and maintained optimally for a long time, and the inside of the machine is prevented due to oil leakage. It is effective in preventing the seizure and breakage of gears installed in the machine, making the machine itself smooth and extending its life.

Claims

An oil seal (3) having a main lip (3a) and an auxiliary lip (3b) in contact with the rotating shaft (2) is inserted between the body (1) and the rotating shaft (2) of the machine, and the oil seal (3) In the oil leakage prevention structure of a mechanical device having a rotating shaft composed of a structure in which the outer circumference is surrounded by a hollow fastening ring (5),

Oil leakage prevention structure of a mechanical device with a rotating shaft, characterized in that the secondary main lip (3c) having an inner diameter larger than the main lip (3a) is formed on the rear of the main lip (3a).

2. The oil of a mechanical device with a rotating shaft according to claim 1, wherein the tightening ring (5) is made of a shape memory alloy whose inner diameter is reduced in a heated state, and is formed in a shape in which a portion of the radial direction is cut in a cross section. Leak-proof structure.