KR20110109281A - Oil seal for crank shaft of vehicle - Google Patents

Oil seal for crank shaft of vehicle Download PDF

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Publication number
KR20110109281A
KR20110109281A KR1020100028930A KR20100028930A KR20110109281A KR 20110109281 A KR20110109281 A KR 20110109281A KR 1020100028930 A KR1020100028930 A KR 1020100028930A KR 20100028930 A KR20100028930 A KR 20100028930A KR 20110109281 A KR20110109281 A KR 20110109281A
Authority
KR
South Korea
Prior art keywords
crank
crank shaft
lip
shaft
oil seal
Prior art date
Application number
KR1020100028930A
Other languages
Korean (ko)
Inventor
강동국
장지덕
Original Assignee
평화오일씰공업주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 평화오일씰공업주식회사 filed Critical 평화오일씰공업주식회사
Priority to KR1020100028930A priority Critical patent/KR20110109281A/en
Publication of KR20110109281A publication Critical patent/KR20110109281A/en

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Classifications

    • 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
    • F16C3/06—Crankshafts
    • F16C3/14—Features relating to lubrication
    • 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
    • F16J15/3208—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings with at least one lip provided with tension elements, e.g. elastic rings
    • 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
    • F16J15/328—Manufacturing methods specially adapted for elastic sealings
    • 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
    • Y10S277/908—Seal for use in rotating and reciprocating arrangement
    • 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
    • Y10S277/935—Seal made of a particular material
    • Y10S277/944—Elastomer or plastic
    • Y10S277/945—Containing fluorine
    • Y10S277/946—PTFE

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

Abstract

 The present invention provides an oil seal for a vehicle crankshaft. An oil seal for a vehicle crankshaft according to an exemplary embodiment of the present invention includes a support frame inserted between a crank housing and a crank shaft, and the support to prevent oil in the crank housing from leaking between the crank housing and the crank shaft. A main lip protruding from the frame to the crank shaft, wherein the main lip has a shaft sealing portion in contact with the crank shaft, and a heat resistant fluorine sheet having self-lubrication is laminated on the upper surface in contact with the crank shaft of the shaft sealing portion. .

Description

Oil seal for vehicle crankshaft {OIL SEAL FOR CRANK SHAFT OF VEHICLE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil seal for a vehicle crankshaft which prevents leakage of oil in a vehicle crank that receives a driving force of a vehicle engine and transmits it to wheels.

In general, a crank is a device that converts a reciprocating motion into a rotational motion. The crankshaft is partially filled with oil in the crank housing surrounding the crankshaft for smooth operation. In addition, an oil seal is provided between the crank housing and the crank shaft so that oil does not leak from the crank housing.

The oil seal is composed of a support frame, a main lip, a dust strip.

The support frame forms an oil seal and is inserted between the crank housing and the crank shaft.

The main lip protrudes from the support frame to the crankshaft to prevent oil in the crank housing from leaking through between the crank housing and the crankshaft.

The dust lip protrudes from the support frame to the crank shaft from the outside of the crank housing between the main lip and the crank shaft to prevent the dust contained in the atmosphere from entering.

In order to prevent oil leakage, the main lip is formed so that interference of the crankshaft, for example 0.5 mm / side, occurs. In addition, the spring load acts on the main lip. Accordingly, when the crank shaft rotates, the frictional resistance between the crank shaft and the main lip increases.

When the frictional resistance is increased, there is a problem that the life is shortened due to the wear of the oil seal. In addition, when the frictional resistance increases, the crankshaft acts as a resistance to rotate, resulting in poor vehicle fuel economy.

The present invention is to solve the above problems, an object of the present invention to provide an oil seal for a vehicle crankshaft having a structure capable of reducing frictional resistance with the crankshaft.

Accordingly, an oil seal for a vehicle crankshaft according to a preferred embodiment of the present invention includes a support frame inserted between the crank housing and the crank shaft, and the oil in the crank housing to prevent leakage between the crank housing and the crank shaft. A main lip protruding from the support frame to the crank shaft, wherein the main lip has a shaft sealing portion in contact with the crank shaft, and a heat resistant fluorine sheet having self-lubrication property is laminated on the upper surface in contact with the crank shaft of the shaft sealing portion. do.

The fluorine sheet may be made of polytetra fluoro ethylene (PTFE) resin. In this case, the fluorine sheet preferably has a thickness of 0.1mm to 0.5mm.

On the other hand, on the upper surface of the shaft sealing portion, a plurality of propeller pins formed side by side inclined to the crank shaft may be formed.

Further, outside the main lip, a dust lip protruding from the support frame to the crank shaft from the outside of the crank housing between the main lip and the crank shaft is formed, and the dust lip is formed. The lip includes an inner lip portion that is formed to be inclined closer to the crank axis direction in the dust lip direction, an outer lip portion which is formed to be inclined away from the crank axis while being in contact with the inner lip portion, and between the outer lip portion and the dust lip. A connecting portion for connecting is formed, and the outer lip portion may be the shaft sealing portion.

In this case, the heat resistant fluorine sheet may be molded by vulcanization adhesion with the main seal.

According to the present invention, the self-lubricating fluorine sheet adheres to the main lip surface, thereby lowering the frictional resistance. Accordingly, the wear of the oil seal is reduced, thereby extending the life and improving fuel efficiency of the vehicle.

1 is a perspective view showing an oil seal for a crankshaft according to a preferred embodiment of the present invention.
2 is a cross-sectional view showing an example in which the oil seal for the crankshaft of FIG. 1 is applied between the crank housing and the crankshaft.
3 is an enlarged perspective view of part A of FIG. 1.
4 is an exploded perspective view of the shaft sealing part and the heat resistant fluorine sheet of FIG. 3.
5 is a perspective view showing a modification of the shaft sealing portion of FIG.

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

1 to 3, an oil seal 100 for a vehicle crankshaft according to an exemplary embodiment of the present invention includes a support frame 110 and a sealing body 210. The crankshaft oil seal 100 may be formed in a hollow annular shape, and the crankshaft 20 is inserted into the hollow and passed therethrough.

The support frame 110 supports the sealing body 210 as a basic frame of the oil seal. The support frame 110 is made of a structure that can be inserted between the crank housing 10 and the crank shaft (20).

The support frame 110 may include a support 111 and a bent portion 113. The support 111 may be supported on the inner wall of the crank housing 10 when fitting between the crank housing 10 and the crank shaft 20. The support 111 is preferably extended to be parallel to the inner wall of the crank housing 10 so that the area supported by the crank housing 10 can be increased.

The bent portion 113 is bent from the support portion in the crank axis 20 direction. In the state where the bent portion is inserted between the crank housing 10 and the crank shaft 20, the bent portion is preferably formed bent from the end toward the outside of the support so that the inside of the oil seal is not opened.

The support frame 110 may be formed of a rigid material, for example, a metal material, to increase the effect of supporting the sealing body 210 and to be firmly supported by the crank housing 10.

The sealing body 210 functions to prevent oil in the crank housing 10 from leaking between the crank housing 10 and the crank shaft 20. The sealing body 210 may include a main lip 120. The main lip 120 protrudes from the support frame to the crank shaft 20 and is continuously formed in a lip shape along the circumference of the crank shaft 20.

In order to increase the sealing effect between the crank housing 10 and the crank shaft 20, the main lip 120 is preferably formed so that the protruding portion is elastically deformed by interference with the crank shaft 20. In addition, the main lip 120 is preferably pressed to the crank shaft 20 by the elastic member 150. Here, the elastic member 150 may be made of a coil spring having a restoring force to contract when tensioned to have an elastic force to close the main lip 120 to the crank shaft 20. In addition, the elastic member 150 may be formed in a ring shape that can wrap the circumference of the main lip 120 to evenly press the main lip 120 to the crank shaft 20.

The sealing body 210 may further include a dust lip 130. The dust lip 130 serves to prevent the dust contained in the atmosphere from flowing between the main lip 120 and the crank shaft 20 from the outside. Accordingly, a phenomenon in which the main lip 120 is worn by the dust may be prevented while the crank shaft 20 rotates with respect to the main lip 120. To this end, the dust lip 130 is disposed outside the main lip 120. The dust lip 130 protrudes from the support frame 110 to the crank shaft 20. The dust lip 130 is continuously formed in a lip shape along the circumference of the crank shaft 20.

The dust lip 130 is formed to be elastically deformed by interference with the crank shaft 20 in order to increase the effect of preventing the outer dust from flowing between the main lip 120 and the crank shaft 20. It is preferable to be. The dust lip 130 is preferably formed to interfere with the crank shaft 20 with an interference amount of about 0.2 mm to 0.6 mm.

Meanwhile, the sealing body 110 may further include an outer sealing part 140. The outer sealing part 140 is installed to be in contact with the crank housing 10 while surrounding the outer edge of the support frame 110, thereby preventing oil from leaking between the crank housing.

On the other hand, the vehicle crankshaft oil seal 100 according to an embodiment of the present invention may further include an elastic member 150 for pressing the main lip 120 to the crankshaft 20. The elastic member 150 may be formed of a coil spring having a restoring force to contract when tensioned to have an elastic force to closely contact the main lip 120 to the crank shaft 20. In addition, the elastic member 150 may be formed in a ring shape that can wrap the circumference of the main lip 120 to evenly press the main lip 120 to the crank shaft 20.

Meanwhile, the main lip 120 may have a shaft sealing part 220. The shaft sealing portion 220 has interference with the crank shaft, and thus is elastic and comes into contact with the crank shaft 20. The heat-resistant fluorine sheet 160 having self-lubrication property is laminated to the upper surface of the shaft sealing part 220 in contact with the crank shaft 20. Since the heat resistant fluorine sheet 160 is made of a material having self-lubricating property, frictional resistance due to the rotation of the crank shaft 20 is lowered.

The lower the frictional resistance, the less wear of the oil seals and the longer life. In addition, to rotate the crankshaft, the shaft sealing portion of the oil seal acts as a resistance, the resistance of which is weakened, thereby improving fuel economy of the vehicle.

Since the engine temperature of the vehicle rises to 110 ° C, the fluorine sheet in contact with the crankshaft must have heat resistance. In addition, the fluorine sheet should have a durability of 150,000 km or more. In addition, the fluorine sheet should have low frictional resistance. Thus, the fluorine sheet 160 may be made of polytetrafluoroethylene (PTFE) resin. The PTFE resin has the advantage of having self-lubricating properties and excellent durability and heat resistance.

The heat resistant fluorine sheet 160 may be molded by simultaneously vulcanizing and adhering to the shaft sealing part 220. In one example of vulcanization, the surface of the fluorine sheet is activated by chemical etching, and the fluorine sheet is vulcanized by vulcanization simultaneously with the rubber of the sealing portion.

By vulcanization adhesion, the surface of the shaft sealing portion and the heat resistant fluorine sheet can be integrated and firmly fixed, so that even if friction occurs with the crankshaft, it is not separated.

The heat resistant fluorine sheet 160 preferably has a thickness t of 0.1 mm to 0.5 mm. If the thickness t is less than 0.1 mm, the fluorine sheet may be buried in rubber during vulcanization. In the case where the fluorine sheet exceeds 0.5 mm, the elastic force becomes small, and the sealing force with the crankshaft becomes weak.

As shown in FIG. 3, the main lip 120 may include an inner lip 121, an outer lip 124, and a connection 127 in the dust lip direction. The inner lip 121 is formed to be inclined closer to the crank axis direction. The outer lip portion 124 is formed to be inclined to gradually move away from the crank shaft 20 while contacting the inner lip portion 121. The tangent between the outer lip 124 and the inner lip 121 is a surface which is in contact with the crank shaft first, and the inner lip 121 is in contact with the crank shaft. Thus, the outer lip portion 124 becomes the shaft sealing portion 220.

When the crankshaft 20 is inserted into the oil seal, the outer lip portion 124 is in contact with the crankshaft 20. The connection part 127 connects between the outer lip part 124 and the dust lip 130.

Meanwhile, as shown in FIG. 5, a plurality of propeller pins 225 spaced apart from each other on the surface of the shaft sealing part 220 may be protruded. The propeller pins 225 are disposed to be inclined to the crank shaft, and serve to guide oil discharged to the outside along the crank shaft back into the crank shaft.

In this case, the heat resistant fluorine sheet 160 may have a shape corresponding to the surface of the shaft sealing portion 220 and the shape of the propeller pin 225. According to this, it can function to guide the oil discharged to the outside along the crankshaft back into the crankshaft.

As described above, although described with reference to a preferred embodiment of the present invention, those skilled in the art will be variously modified and changed without departing from the spirit and scope of the invention described in the claims below I can understand that you can.

100: crankshaft oil seal 110: support frame
120: main lip 121: inner lip
124: outer lip 127: connecting portion
130: dust lip 150: elastic member
160: heat resistant fluorine sheet 210: sealing body
220: shaft sealing portion 225: propeller pin

Claims (6)

An oil seal for a vehicle crankshaft employed in a vehicle crank having a crank housing partially filled with oil and a crankshaft rotatably installed with respect to the crank housing and receiving a driving force of a vehicle engine and transmitting the wheel to a wheel,
A support frame inserted between the crank housing and the crank shaft; And
And a main lip protruding from the support frame to the crank shaft to prevent oil in the crank housing from leaking between the crank housing and the crank shaft.
The main lip has a shaft sealing portion in contact with the crank shaft, the crank shaft oil seal for vehicle crankshaft, characterized in that the heat-resistant fluorine sheet having a self-lubrication is laminated on the upper surface in contact with the crank shaft. The method of claim 1,
The fluorine sheet is a vehicle crankshaft oil seal, characterized in that made of polytetrafluoroethylene (PTFE) resin. The method of claim 2,
The fluorine sheet is an oil seal for a vehicle crankshaft, characterized in that having a thickness of 0.1mm to 0.5mm. The method of claim 1,
On the upper surface of the shaft sealing portion, the vehicle crankshaft oil seal, characterized in that a plurality of propeller pins are formed side by side inclined to the crank shaft. The method of claim 1,
Outside the main lip, a dust lip protruding from the support frame to the crank shaft from the outside of the crank housing between the main lip and the crank shaft to prevent flow of dust.
The main lip includes an inner lip portion formed to be inclined closer to the crank axis direction in the direction of the dust lip, an outer lip portion formed to be inclined away from the crank shaft while being in contact with the inner lip portion, the outer lip portion and the dust lip. The connecting portion is formed between them,
Oil seal for a vehicle crankshaft, characterized in that the outer lip portion is the shaft sealing portion. The method of claim 1,
The heat resistant fluorine sheet is an oil seal for a vehicle crankshaft, characterized in that formed by vulcanization and adhesion at the same time with the main seal.
KR1020100028930A 2010-03-31 2010-03-31 Oil seal for crank shaft of vehicle KR20110109281A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020100028930A KR20110109281A (en) 2010-03-31 2010-03-31 Oil seal for crank shaft of vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020100028930A KR20110109281A (en) 2010-03-31 2010-03-31 Oil seal for crank shaft of vehicle

Publications (1)

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KR20110109281A true KR20110109281A (en) 2011-10-06

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KR1020100028930A KR20110109281A (en) 2010-03-31 2010-03-31 Oil seal for crank shaft of vehicle

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106704595A (en) * 2016-12-27 2017-05-24 广州机械科学研究院有限公司 Framework-preposed oil seal used under high pressure
KR101988402B1 (en) * 2017-12-11 2019-06-12 평화오일씰공업 주식회사 Coil spring assembly and oil seal with the same
CN110529599A (en) * 2019-08-16 2019-12-03 广东亿达汽车密封件股份有限公司 Lip-type seal part for rotary shaft
KR20200117323A (en) * 2019-04-03 2020-10-14 평화오일씰공업주식회사 Sealing ring with anti-folding function
KR20220002665U (en) * 2021-04-29 2022-11-07 푸이 오일 씰 인더스트리얼 코., 엘티디. Oil seal structure

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106704595A (en) * 2016-12-27 2017-05-24 广州机械科学研究院有限公司 Framework-preposed oil seal used under high pressure
CN106704595B (en) * 2016-12-27 2019-11-01 广州机械科学研究院有限公司 The preposition oil sealing of high pressure skeleton
KR101988402B1 (en) * 2017-12-11 2019-06-12 평화오일씰공업 주식회사 Coil spring assembly and oil seal with the same
KR20200117323A (en) * 2019-04-03 2020-10-14 평화오일씰공업주식회사 Sealing ring with anti-folding function
CN110529599A (en) * 2019-08-16 2019-12-03 广东亿达汽车密封件股份有限公司 Lip-type seal part for rotary shaft
KR20220002665U (en) * 2021-04-29 2022-11-07 푸이 오일 씰 인더스트리얼 코., 엘티디. Oil seal structure

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