KR20080053603A - An oil seal stopping a oil leak - Google Patents

An oil seal stopping a oil leak Download PDF

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Publication number
KR20080053603A
KR20080053603A KR1020060125339A KR20060125339A KR20080053603A KR 20080053603 A KR20080053603 A KR 20080053603A KR 1020060125339 A KR1020060125339 A KR 1020060125339A KR 20060125339 A KR20060125339 A KR 20060125339A KR 20080053603 A KR20080053603 A KR 20080053603A
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KR
South Korea
Prior art keywords
fixed
oil seal
shaft
housing
oil
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KR1020060125339A
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Korean (ko)
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KR101209603B1 (en
Inventor
김경범
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현대자동차주식회사
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Priority to KR1020060125339A priority Critical patent/KR101209603B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/164—Sealings between relatively-moving surfaces the sealing action depending on movements; pressure difference, temperature or presence of leaking fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C3/00—Shafts; Axles; Cranks; Eccentrics
    • F16C3/04—Crankshafts, eccentric-shafts; Cranks, eccentrics
    • F16C3/20—Shape of crankshafts or eccentric-shafts having regard to balancing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3204—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2326/00—Articles relating to transporting
    • F16C2326/01—Parts of vehicles in general
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S277/00—Seal for a joint or juncture

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Sealing With Elastic Sealing Lips (AREA)

Abstract

An oil seal with improved oil leakage preventing performance is provided to prevent uneven wear of a lip part by always maintaining concentricity between the lip part and a shaft through vertical and horizontal motions of an elastic connecting unit. An oil seal with improved oil leakage preventing performance includes a housing fixing rubber(20), an elastic connecting unit(30), and a shaft sealing unit(40). The housing fixing rubber has a steel plate(22) fixed to a housing and is movably connected to the shaft sealing unit by the elastic connecting unit. A lip part of the shaft sealing unit is tightly fixed to a shaft by a spring(43). Concentricity between the lip part and the shaft is kept constant by the elastic connecting unit.

Description

누유방지 성능이 강화된 오일씰 {An oil seal stopping a oil leak }An oil seal stopping a oil leak}

도 1은 종래의 오일씰 구조를 도시한 개략도.1 is a schematic view showing a conventional oil seal structure.

도 2는 본 발명의 누유방지 성능이 강화된 오일씰을 도시한 개념도.Figure 2 is a conceptual diagram showing the oil seal enhanced the leakage preventing performance of the present invention.

도 3은 본 발명의 누유방지 성능이 강화된 오일씰을 도시한 일부 절단 사시도.Figure 3 is a partially cut perspective view showing the oil seal of the oil leakage preventing performance of the present invention is enhanced.

도 4는 본 발명의 누유방지 성능이 강화된 오일씰을 도시한 확대도.Figure 4 is an enlarged view showing the oil seal is enhanced leakage preventing performance of the present invention.

<도면의 주요 부분에 대한 부호의 설명><Explanation of symbols for the main parts of the drawings>

1 : 하우징 2 : 샤프트1: housing 2: shaft

3 : 오일측 4 : 오일씰3: oil side 4: oil seal

5 : 하우징장착부 6 : 스틸판5 housing mounting part 6 steel plate

7 : 립부 8 : 대기측7: lip portion 8: atmosphere side

9 : 스프링 10 : 오일씰9: spring 10: oil seal

20 : 하우징고정고무 21 : 고정홈20: housing fixing rubber 21: fixing groove

22 : 스틸판 30 : 탄성연결체22: steel plate 30: elastic connector

31 : 주름부 32, 33 : 고정단부31: wrinkles 32, 33: fixed end

40 : 샤프트실링재 41 : 홈부40 shaft sealing material 41 groove

42 : 스프링홈부 43 : 스프링42: spring groove 43: spring

44 : 보강스틸판 45 : 립부44: reinforcing steel plate 45: rib portion

본 발명은 누유방지 성능이 강화된 오일씰에 관한 것으로서, 더욱 상세하게는 엔진 크랭크 샤프트 리어 쪽의 오일 실링을 위한 오일씰의 구조를 개선하여 오일씰과 샤프트의 중심이 맞지 않아 편마모되는 것을 방지하고, 오일씰의 장착이 정확하지 않을 때 발생하는 누유 현상을 방지하는 누유방지 성능이 강화된 오일씰에 관한 것이다.The present invention relates to an oil seal with improved leakage preventing performance, and more particularly, to improve the structure of the oil seal for oil sealing at the rear of the engine crankshaft to prevent the oil seal from being misaligned with the center of the shaft, and to prevent the wear of the oil seal. The present invention relates to an oil seal with enhanced leakage preventing performance that prevents leakage caused by incorrect mounting.

엔진 크랭크 샤프트 리어쪽에는 오일 실링(Sealing)을 위하여 도 1과 같은 구조의 오일씰(4)을 장착하는데, 이러한 오일씰(4)은 하우징(1)과 샤프트(2) 사이에 설치하여 오일측(3)에 있는 오일이 대기측(8)으로 누유되는 것을 방지하는 것이다.On the rear side of the engine crankshaft, an oil seal 4 having a structure as shown in FIG. 1 is mounted for oil sealing, and the oil seal 4 is installed between the housing 1 and the shaft 2 so that the oil side 3 This is to prevent the oil in the oil leakage to the atmosphere (8).

오일씰(4)은 단면이 ㄱ자 형태로 절곡된 스틸판(6)에 의해 지지되어 하우징(1)과 밀착하여 고정되는 하우징장착부(5)와 샤프트(2)에 접하여 오일의 누유를 방지하는 립부(7)가 일체로 형성되고, 이러한 몸체는 불소계 고무로 이루어진다.The oil seal 4 is supported by a steel plate 6 bent in an L-shape in cross section and is in contact with the housing mounting part 5 and the shaft 2 fixed in close contact with the housing 1 to prevent leakage of oil. 7) is formed integrally, and this body is made of fluorine-based rubber.

립부(7)는 스프링(9)에 의하여 샤프트(2) 쪽으로 밀착되도록 지지되어 누유를 막아준다.The lip 7 is supported to be in close contact with the shaft 2 by a spring 9 to prevent leakage.

하지만 이와 같은 구조의 오일씰(4)은 다음과 같은 원인에 의해 립부(7)가 편마모되기 쉬우며, 이로 인해 오일이 누유되는 문제가 발생하는 문제가 있다.However, the oil seal 4 having such a structure is liable to wear the lip portion 7 due to the following causes, there is a problem that the oil leakage occurs.

첫번째로 하우징(1)의 오일씰 장착부가 편심되어 가공되었을 경우 오일씰의 중심이 샤프트의 중심과 맞지 않는 편심 현상이 발생하여 오일씰 립부의 편마모가 발생한다.First, when the oil seal mounting part of the housing 1 is eccentrically processed, an eccentric phenomenon occurs in which the center of the oil seal does not match the center of the shaft, and the wear of the oil seal lip occurs.

그리고 두번째로 하우징(1)의 오일씰 장착부의 직각도가 정확하지 않을 경우 오일씰이 샤프트(2)에 대해서 경사지게 조립될 수 있으며, 이런 경우에도 오일씰 립부의 편마모를 야기시킬 수 있는 문제가 있다.And secondly, if the right angle of the oil seal mounting portion of the housing 1 is not correct, the oil seal may be assembled inclined with respect to the shaft 2, and in this case, there is a problem that may cause uneven wear of the oil seal lip.

본 발명은 전술한 바와 같은 문제를 해결하기 위하여 안출한 것으로서, 하우징의 오일씰 장착부가 편심 가공되었을 때도 오일씰 립부와 샤프트가 항상 동심을 유지할 수 있게 하고, 여러 가지 원인으로 인한 립부의 편마모를 방지하여 오일씰의 누유방지 성능을 개선하고자 하는 목적이 있다.The present invention has been made in order to solve the problems as described above, even when the oil seal mounting portion of the housing is eccentrically processed to ensure that the oil seal lip and the shaft is always concentric, and prevents the wear of the lip of the lip due to various causes oil seal The purpose is to improve the performance of leakage prevention.

본 발명은 전술한 바와 같은 목적을 달성하기 위하여 하우징에 고정되는 스틸판이 내장된 하우징고정고무가 탄성연결체에 의해 요동 가능하게 샤프트실링재에 연결되고, 샤프트실링재의 립부가 샤프트에 스프링에 의해 밀착 고정되며, 탄성연결체에 의해 립부와 샤프트가 항상 동심을 유지할 수 있게 구성하는 것을 특징으로 하고, 하우징고정고무에 고정홈이 내측을 향하여 형성되며, 고정홈에 탄성연결체의 일단이 삽입되어 고정되고, 샤프트실링재의 단부에 홈부가 형성되어 탄성연결체의 타단이 삽입되어 고정되는 것을 특징으로 하며, 탄성연결체는 일단에 티형 고정단부가 형성되어 티형으로 이루어진 하우징고정고무의 고정홈에 삽입되어 고정되고, 탄성연결체의 타단에 돌출된 고정단부가 형성되어 샤프트실링재의 홈부에 삽입 고정되며, 홈부를 둘러싸도록 보강스틸판이 샤프트실링재에 내장되어 립부의 치수를 유지시키게 하는 것을 특징으로 하며, 탄성연결체의 중앙에 주름부가 형성된 것을 특징으로 하는 누유방지 성능이 강화된 오일씰을 제공한다.In order to achieve the above object, the present invention provides a housing fixing rubber in which a steel plate is fixed to a housing so that the housing fixing rubber is swingably connected to the shaft sealing member by an elastic connecting member, and the lip portion of the shaft sealing member is tightly fixed to the shaft by a spring. It is characterized in that the lip and the shaft is configured to maintain the concentric at all times by the elastic connector, the fixing groove is formed in the housing fixing rubber toward the inside, one end of the elastic connector is inserted into the fixing groove and fixed The groove is formed at the end of the shaft sealing material, and the other end of the elastic connector is inserted and fixed. The elastic connector has a tee type fixed end formed at one end thereof and is inserted into and fixed to the fixing groove of the housing fixing rubber. A fixed end portion protruding from the other end of the elastic connector is inserted into and fixed to the groove portion of the shaft sealing material, Portion is embedded in the reinforcing steel plate so as to surround the shaft sealing member, and wherein the lip portion thereby maintaining the dimensions, and provides a leak-preventing oil seal performance is enhanced, characterized in that folds are formed in the center portion of the resilient connecting body.

이하 첨부된 도면을 참조하여 본 발명의 구성을 상세히 설명하면 다음과 같다.Hereinafter, the configuration of the present invention will be described in detail with reference to the accompanying drawings.

본 명세서 및 청구범위에 사용된 용어나 단어는 통상적이거나 사전적인 의미로 한정해서 해석하여서는 되지 않고, 발명자는 그 자신의 발명을 가장 최선의 방법으로 설명하기 위해 용어의 개념을 적절하게 정의할 수 있다는 원칙에 입각하여 본 발명의 기술적 사상에 부합하는 의미와 개념으로 해석되어야만 한다.The terms or words used in the present specification and claims should not be interpreted as being limited to the ordinary or dictionary meanings, and the inventors may appropriately define the concept of terms in order to best explain the invention of their own. Based on the principle, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention.

본 발명은 도 2, 도 3, 도 4에 도시되어 있듯이, 하우징(1)에 밀착되어 고정되는 하우징고정고무(20)와 샤프트(2)에 밀착 고정되는 샤프트실링재(40)가 탄성연결체(30)에 의해 상하 전후로 움직일 수 있게 고정되어 하우징의 가공불량에 의한 오일씰의 편마모를 방지하게 한 것을 주요 구성으로 한다.2, 3, and 4, the housing fixing rubber 20 fixed to the housing 1 and the shaft sealing material 40 fixed to the shaft 2 are elastically connected ( It is fixed to be able to move up and down and up and down by 30) to prevent uneven wear of oil seal due to poor processing of housing.

하우징(1)에 고정되는 하우징고정고무(20)는 기존 재질과 같이 불소계 고무로 이루어지고, 하우징고정고무(20)의 내부에 스틸판(22)이 내장된다. 스틸판(22) 은 단면이 ㄱ자 형상으로 절곡되어 형태를 유지하게 한다.The housing fixing rubber 20 fixed to the housing 1 is made of fluorine-based rubber as in the conventional material, and the steel plate 22 is embedded in the housing fixing rubber 20. The steel plate 22 is bent in a L-shaped cross section to maintain the shape.

하우징고정고무(20)의 내측으로 티(T)형 고정홈(21)이 형성되고, 고정홈(21)에 탄성연결체(30)의 일단이 삽입되어 고정된다.A tee (T) -type fixing groove 21 is formed inside the housing fixing rubber 20, and one end of the elastic connector 30 is inserted into and fixed to the fixing groove 21.

탄성연결체(30)는 탄성 고무로 이루어지고, 그 일단에 티(T)형 고정단부(32)가 형성되어 하우징고정고무(20)의 고정홈(21)에 삽입되어 고정된다. 탄성연결체(30)의 타단에는 수평으로 돌출된 고정단부(33)가 형성되어 샤프트실링재(40)의 홈부(41)에 삽입되어 고정된다.The elastic connector 30 is made of an elastic rubber, a tee (T) -type fixed end 32 is formed at one end thereof is inserted into the fixing groove 21 of the housing fixing rubber 20 and fixed. The other end of the elastic connector 30 is formed with a fixed end portion 33 protruding horizontally is inserted into the groove portion 41 of the shaft sealing material 40 is fixed.

탄성연결체(30)의 중앙부에는 주름부(31)가 형성되어 상하운동이나 전후운동이 가능하게 해준다. 주름부(31)가 접히면서 상하운동이 되게 되고, 주름부(31)가 휘어지며 전후 이동이 된다.The center portion of the elastic connector 30 is formed with a wrinkle portion 31 to enable vertical movement or forward and backward movement. As the wrinkles 31 are folded up and down, the wrinkles 31 are bent and moved back and forth.

샤프트실링재(40)는 불소계 고무로 이루어지고, 그 형상은 외측으로 홈부(41)가 형성되어 탄성연결체(30)의 단부가 삽입 고정되며, 반대편에 립부(45)가 형성되어 샤프트(2)와 밀착된다. 립부(45)의 샤프트(2)에 밀착되도록 외측에서 스프링(43)으로 탄력지지시킨다.Shaft sealing material 40 is made of fluorine-based rubber, the shape of the groove portion 41 is formed to the outside end of the elastic connector 30 is inserted and fixed, the lip portion 45 is formed on the opposite side shaft 2 Close contact with It is elastically supported by the spring 43 from the outside to be in close contact with the shaft 2 of the lip portion 45.

탄성연결체(30)의 운동에 의해 립부(45)와 샤프트(2)가 항상 동심을 유지 할 수 있게 된다.The lip 45 and the shaft 2 can be kept concentric at all times by the movement of the elastic connector 30.

샤프트실링재(40)의 홈부(41)를 둘러싸도록 보강스틸판(44)이 샤프트실링재(40)에 내장되어 립부(45)의 치수가 유지된다.A reinforcing steel plate 44 is embedded in the shaft sealing material 40 so as to surround the groove 41 of the shaft sealing material 40 so that the dimensions of the lip part 45 are maintained.

따라서 탄성연결체(30)에 의해 하우징고정고무(20)와 샤프트실링재(40)가 탄력적으로 지지되므로 오일씰 장착부의 편심 가공이나 직각도 불량에 의한 립부의 편마모가 방지된다.Therefore, the housing fixing rubber 20 and the shaft sealing material 40 are elastically supported by the elastic connector 30 to prevent eccentric wear of the oil seal mounting portion or lip wear due to poor right angle.

이상과 같이 본 발명은 하우징의 오일씰 장착부가 편심 가공되었을 경우에도 탄성연결체가 상하로 움직임으로 인하여 오일씰 립부와 샤프트는 항상 동심을 유지할 수 있는 효과가 있다.As described above, according to the present invention, even when the oil seal mounting part of the housing is eccentrically processed, the oil seal lip part and the shaft are always kept concentric because the elastic connector moves up and down.

하우징의 오일씰 장착부 가공의 직각도가 불량할 경우에도 탄성연결체가 전후로 움직임으로 인하여 오일씰 립부 중심과 샤프트의 중심이 서로 기울어지는 것을 잡아주는 효과가 있다.Even when the right angle of processing of the oil seal mounting part of the housing is poor, there is an effect of catching the inclination of the center of the oil seal lip part and the center of the shaft due to the movement of the elastic connector back and forth.

탄성연결체가 상하와 전후로 움직여 오일씰 립부와 샤프트의 중심이 항상 동심과 평행을 유지하게 함으로써 립부의 편마모가 방지되는 효과가 있다. The elastic connector moves up and down and back and forth so that the centers of the oil seal lip and the shaft are always kept parallel to the concentric, thereby preventing uneven wear of the lip.

Claims (4)

하우징(1)에 고정되는 스틸판(22)이 내장된 하우징고정고무(20)가 탄성연결체(30)에 의해 요동 가능하게 샤프트실링재(40)에 연결되고, 샤프트실링재(40)의 립부(45)가 샤프트(2)에 스프링(43)에 의해 밀착 고정되며, 탄성연결체(30)에 의해 립부(45)와 샤프트(2)가 항상 동심을 유지 할 수 있게 구성하는 것을 특징으로 하는 누유방지 성능이 강화된 오일씰.The housing fixing rubber 20 having the steel plate 22 fixed to the housing 1 is connected to the shaft sealing material 40 so as to be able to swing by the elastic connecting member 30, and the lip portion of the shaft sealing material 40. The oil leakage, characterized in that 45 is fixed to the shaft 2 by the spring 43, the lip 45 and the shaft 2 by the elastic connector 30 to always maintain concentricity Oil seal with enhanced protection. 제 1 항에 있어서, 하우징고정고무(20)에 고정홈(21)이 내측을 향하여 형성되고, 고정홈(21)에 탄성연결체(30)의 일단이 삽입되어 고정되며, 샤프트실링재(40)의 단부에 홈부(41)가 형성되어 탄성연결체(30)의 타단이 삽입되어 고정되는 것을 특징으로 하는 누유방지 성능이 강화된 오일씰.According to claim 1, wherein the fixing groove 21 is formed in the housing fixing rubber 20 to the inside, one end of the elastic connector 30 is inserted into the fixing groove 21 is fixed, the shaft sealing material 40 Groove portion (41) is formed at the end of the oil seal, characterized in that the other end of the elastic connector 30 is inserted and fixed is fixed. 제 1 항 또는 제 2 항에 있어서, 탄성연결체(30)는 일단에 티형 고정단부(32)가 형성되어 티형으로 이루어진 하우징고정고무(20)의 고정홈(21)에 삽입되어 고정되고, 탄성연결체(30)의 타단에 돌출된 고정단부(33)가 형성되어 샤프트실링재(40)의 홈부(41)에 삽입 고정되며, 홈부(41)를 둘러싸도록 보강스틸판(44)이 샤프트실링재(40)에 내장되어 립부(45)의 치수를 유지시키게 하는 것을 특징으로 하는 누유방지 성능이 강화된 오일씰.According to claim 1 or 2, the elastic connector 30 is formed in the fixed groove portion 32 of the housing fixing rubber 20 made of a tee formed with a tee-shaped fixed end portion 32 at one end, elasticity A fixed end portion 33 protruding from the other end of the connecting body 30 is formed and inserted into and fixed to the groove portion 41 of the shaft sealing material 40, and the reinforcing steel plate 44 is formed to surround the groove portion 41. The oil seal is reinforced oil leakage, characterized in that the built-in 40) to maintain the dimensions of the lip (45). 제 3 항에 있어서, 탄성연결체(30)의 중앙에 주름부(31)가 형성된 것을 특징으로 하는 누유방지 성능이 강화된 오일씰.4. The oil seal of claim 3, wherein the wrinkle portion 31 is formed at the center of the elastic connector.
KR1020060125339A 2006-12-11 2006-12-11 An oil seal stopping a oil leak KR101209603B1 (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150091992A (en) * 2014-02-04 2015-08-12 엔오케이 가부시키가이샤 Oil seal
KR20150091991A (en) * 2014-02-04 2015-08-12 엔오케이 가부시키가이샤 Oil seal
KR20150091993A (en) * 2014-02-04 2015-08-12 엔오케이 가부시키가이샤 Oil seal
KR20180054294A (en) * 2016-11-15 2018-05-24 평화오일씰공업주식회사 Bonded piston seal and clutch unit with the same
CN112555269A (en) * 2020-12-08 2021-03-26 宁波捷成轴业有限公司 Transmission shaft with dustproof oil seal structure

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200160092Y1 (en) * 1996-12-27 1999-11-01 정몽규 Oilseal for oilsealing in eccentric shaft

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150091992A (en) * 2014-02-04 2015-08-12 엔오케이 가부시키가이샤 Oil seal
KR20150091991A (en) * 2014-02-04 2015-08-12 엔오케이 가부시키가이샤 Oil seal
KR20150091993A (en) * 2014-02-04 2015-08-12 엔오케이 가부시키가이샤 Oil seal
KR20180054294A (en) * 2016-11-15 2018-05-24 평화오일씰공업주식회사 Bonded piston seal and clutch unit with the same
CN112555269A (en) * 2020-12-08 2021-03-26 宁波捷成轴业有限公司 Transmission shaft with dustproof oil seal structure
CN112555269B (en) * 2020-12-08 2022-04-29 宁波捷成轴业有限公司 Transmission shaft with dustproof oil seal structure

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