KR100895995B1 - Oil seal having double-rib - Google Patents

Abstract

The present invention blocks the external leakage of the engine oil by one or more lip edges in close contact with the outer circumferential surface of the crankshaft in the automotive engine, and also lip various foreign substances such as dust, wet steam, sand particles, etc. introduced from the outside. The present invention relates to an oil seal having a double lip that is completely blocked by a tip or a dust lip.

The present invention has a plurality of inner intaglio grooves formed at equal intervals on the inner inclined surface and a plurality of outer intaglio grooves formed in a direction opposite to the direction in which the inner intaglio grooves are formed on the outer inclined surface and the first lip tip formed on the side where oil penetrates; And a plurality of inner intaglio grooves formed on the inner inclined surface at equal intervals and a plurality of outer intaglio grooves formed in the opposite direction to the direction in which the inner intaglio grooves are formed on the outer inclined surface and leaking through a gap between the first lip end and the crankshaft. A circumferential direction between the first lip tip and the second lip tip so as to retain oil leaked through the first lip tip, the second lip tip being formed on the oil side and having an inner diameter larger than the first lip tip; It includes an oil pocket formed in, the inner diameter of the second lip tip provides an oil seal to be processed larger than the inner diameter of the first lip tip.

Lip, Oil Seal, Lubrication, Oil Pocket

Description

Oil Seal with Double Lips {OIL SEAL HAVING DOUBLE-RIB}

1 is a perspective view showing an oil seal according to an embodiment of the present invention

2 is a cross-sectional view showing an oil seal according to another embodiment of the present invention.

Figure 3 schematically shows an oil seal according to the prior art

<Description of the symbols for the main parts of the drawings>

20 ', 20 "Mounting Section 30 First Lip Tip

33 Second lip tip 41 First micro lip tip

42 2nd Microrip Tip 100 ', 100 "Crankshaft

120 Double Lip Oil Seal 130 Micro Double Oil Seal

The present invention relates to an oil seal having a double lip used for a crankshaft of an automobile engine, and more particularly, to prevent external leakage of engine oil by two or more lip edges on the outer circumferential surface of a crankshaft in an automobile engine. In addition, the present invention relates to an oil seal having a double lip that completely blocks various foreign substances such as dust, wet steam, and sand particles introduced from the outside by a lip tip or a dust lip.

In general, the oil seal mounted on the outer circumferential surface of the rotating crankshaft has a crankshaft (100) assembled at the interface between the engine block and the oil storage tank to prevent oil from scattering or leaking out of the oil tank. The sealing device inserted into the outer circumferential surface of the crankshaft seal, and the one lip tip 10 which rotates the friction friction contact movement with the outer circumferential surface of the crankshaft 100 is elastically tightened in the radial direction by the annular garter spring 11. The inner sloping surface 12 of the lip tip 10 is in contact with oil, and a plurality of spherical reliefs 14 protruding along the outer circumferential surface of the outer sloping surface 13 of the lip tip 10 have the engine oil lip. There is a flex 15 which contributes to suppressing the leakage of the engine oil flowing into the tip 10 and is recessed along the extension line of the outer inclined surface 13, and external foreign matter is placed on the lip tip of the extension line of the flex 15. Flowed into (10) There is a dust strip 16 to block it, and the metal support 17 inserted into the polymer material in the extension line of the flex 15 and the dust strip 16 is in contact with the oil inward and in contact with the air outward. A plurality of rectangular indentations 18 are formed at equal intervals in the middle region of the metal support 17, and at the other end of the metal support 17, a polymer material mounting part for fixing the oil seal 110 to the housing 19. 20 is formed.

These oil seals attempt to increase the sealing force of the lip tip in contact with the outer circumferential surface of the crankshaft to block axial leakage of engine oil generated by the rotation of the crankshaft of the automobile engine and to prevent foreign matter from entering. Is shortened, in particular, the oil thin film formed at the lip tip easily breaks and dry friction is continued, so that the hardening phenomenon of the polymer material is continuously progressed and the life of the wear on the contact surface of the rotational friction of the crankshaft is shortened. In order to reduce the frictional contact part of the crankshaft, the surface hardening process is performed to increase the hardness. Therefore, the surface modification processing cost is high and the space for installing the dust strip should be secured enough to block the foreign material from entering the oil seal. As the length naturally increases, The difficulty arises from the screen and the crankshaft space design aspects.

However, when the conventional oil seal is used for a long time, as the crank shaft rotates, the sealing property of blocking the leakage of the engine oil staying in the engine oil storage tank is inferior, which weakens the elastic tightening force acting in the axial direction of the lip tip. The oil slowly escapes in the axial direction, or the frictional heat generated by the initial excessive sealing force applied to the lip tip damages the fine oil film formed on the rotating frictional working surface between the lip tip and the crankshaft, leading to oil leakage. Will result. In addition, when the rubber material at the lip end hardens, surface hardening of the crankshaft causes wear on the friction surface, and oil leakage occurs, as well as the mechanical strength of the crankshaft, which causes noise and vibration, thus surface hardening of the crankshaft. More advanced technology must be applied and ultimately suffer from problems that weaken the oil seal and crankshaft endurance.

In the meantime, the oil consumed when the engine oil leaks due to the damage of rotational friction of the lip tip of the oil seal and the elastic sealing force of the polymer material applied to the lip tip due to the fatigue strength of the polymer material applied to the flex area of the oil seal. It is common to solve the problem caused by the lack of oil by supplementing separately.

However, the recent tightening of environmental regulations and the replacement of damaged oil seals to improve the durability of the engine to prevent leakage are far from the durability improvement technology to extend the warranty period of the vehicle. Surface hardening technology that blocks oil leakage through material development and improves the wear resistance of the crankshaft is limited in securing sealing safety.

Accordingly, the present invention has been made in order to solve the above problems, it is provided with a double lip or micro double lip on the lip tip, and the same interval having various shapes in opposite directions along the outer circumferential surface of both inclined surfaces of these lip tips Install a number of small indentation grooves to push oil into the lip end as far as possible from the lip end, and install another lip end in the extension line of the lip end, It installs a number of equally spaced grooves to block the oil leaking from the engine oil storage tank.However, if leakage occurs, the leaked oil is lubricated to stay in the small oil pocket space installed between the two lip ends. At the tip of the lip, make sure that the fine oil film is kept even at all times, The oil seal and crankshaft life let give an oil and the oil pocket dotted yijungrip oil seal with a rotation speed and direction of the pressure difference to be maintained for a long time is aimed.

The present invention has a plurality of inner intaglio grooves formed at equal intervals on the inner inclined surface and a plurality of outer intaglio grooves formed in a direction opposite to the direction in which the inner intaglio grooves are formed on the outer inclined surface and the first lip tip formed on the side where oil penetrates; And a plurality of inner intaglio grooves formed on the inner inclined surface at equal intervals and a plurality of outer intaglio grooves formed in the opposite direction to the direction in which the inner intaglio grooves are formed on the outer inclined surface and leaking through a gap between the first lip end and the crankshaft. A circumferential direction between the first lip tip and the second lip tip so as to retain oil leaked through the first lip tip, the second lip tip being formed on the oil side and having an inner diameter larger than the first lip tip; It includes an oil pocket formed in, the inner diameter of the second lip tip provides an oil seal to be processed larger than the inner diameter of the first lip tip.

The present invention also includes a first microlip tip having a plurality of inner intaglio grooves formed on the inner inclined surface in contact with the engine oil at equal intervals, and a second microlip tip formed along an axial extension line of the first microlip tip. A small space for retaining oil leakage by an oil pocket formed between the first microlip tip and the second microlip tip, and a plurality of outer negative grooves formed at equal intervals on the outer inclined surface of the second microlip tip The strip is formed in a direction opposite to the inner intaglio groove of the microlip tip, and the strip is formed on an extension line of the outer inclined surface of the second microlip tip.

Hereinafter, an oil seal having a double lip according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The crankshaft double lip oil seal 120 of an automobile engine according to an embodiment of the present invention is a crank along the outer circumferential surface of the first lip tip 30 and the oil-side inner sloping surface 12 ′ of the first lip tip 30. A plurality of inner negative grooves having various shapes at equal intervals along the outer circumferential surface of the oil-side inner sloping surface 12 ′ of the first lip tip 30 and rotating friction contact motion with respect to the circumferential surface of the shaft 100 ′. (31) are formed, and a plurality of shapes having various shapes in different directions from the inner intaglio groove (31) at equal intervals along the outer circumferential surface of the oil pocket side outer inclined surface (13 ') of the first lip tip (30) An outer recess 32 is formed, and a second lip tip 33 is formed in contact with the leaked oil on an extension line of the outer circumferential surface connected to the outer sloping surface 13 ', and the first lip tip 30 and the first lip tip 30 are formed. There is an oil pocket 200 which is a small space in which the leaked oil stays between the two lip tips 33. A plurality of inner intaglio grooves 31 ′ having various shapes are formed along the outer circumferential surface of the inner inclined surface 12 ″ in contact with the oil leaked from the second lip tip 33 at various intervals, and in contact with air. A plurality of equidistant outer negative grooves 32 'are formed along the outer circumferential surface of the outer inclined surface 13' 'of the second lip tip 33 in a direction different from that of the inner negative groove 31'. And a flex 15 'recessed in an extension line of the outer inclined surface 13' ', and a metal support 17' is inserted into the polymer material as an insert in the extension line of the flex 15 'and the first lip tip. The circumferential sealing force of the 30 and the second lip tip 32 is firmly maintained with respect to the crankshaft 100 ', and a plurality of air gaps are formed in the outer intermediate zone air layer of the metal support 17' in contact with the outside air. A rectangular indentation groove 18 'is formed at a spaced interval, and the other end of the metal support 17' is along the outer circumferential surface. There is a polymer material mounting portion 20 ′ for assembling the housing 19 ′ of the contact boundary surface connecting the engine block and the oil storage tank, and along the outer circumferential surface in contact with the oil of the first lip tip 30. A semicircular groove 21 'is formed, and the garter spring 11' is assembled along the outer circumferential surface of the semicircular groove 21 'to provide an appropriate elastic sealing force for the first lip tip 30 and the second lip tip 32. To provide.

The double lip oil seal has a plurality of inner intaglio grooves having various shapes along the outer circumferential surface of the inner inclined surface 12 ′ in contact with the engine oil at the first lip tip 30 in contact with the crankshaft 100 ′. 31 is formed, a plurality of outer intaglio grooves 32 having various shapes are formed along the outer circumferential surface of the outer inclined surface 13 'toward the oil pocket 200 side of the first lip tip 30, and the outer inclined surface ( 13 ′) has a second lip tip 33, and the oil pocket 200 is formed in a small space between the first lip tip 30 and the second lip tip 33. There is an inner inclined surface 12 '' toward the oil pocket 200 side of the second lip tip 33, and a plurality of inner indented grooves 31 'having various shapes are formed along the outer circumferential surface of the inner inclined surface 12' '. And an outer inclined surface 13 '' in contact with the air of the second lip tip 33, and a plurality of outer indented grooves 32 'having various shapes along the outer circumferential surface of the outer inclined surface 13' '. And a flex 15 'recessed to the other end of the outer inclined surface 13' ', and a metal support 17' is inserted into the polymer material as an insert in the extension line of the flex 15 'and the polymer material The metal support 17 'inserted into the insert is in contact with the oil inwards, and a plurality of square recesses 18' are formed at equal intervals in the middle section of the metal support 17 'in contact with the air outward. On the other end of the metal support 17 ', a polymer element for fixing the double-lip oil seal 120 to the housing 19' The remounting portion 20 'is formed.

A plurality of intaglio grooves having various shapes are formed in opposite directions along the inclined surfaces of the oil side and the oil pocket side around the first lip tip to block the engine oil from escaping in the axial direction along the first lip tip. However, if the oil leaks, the oil leaks in the small oil pocket space formed between the first lip tip and the second lip tip and is formed along the inclined surfaces of the oil pocket side and the air side around the second lip tip. The intaglio grooves contribute to blocking the leakage of oil by the circulating force acting toward the first proximal end. That is, in the double-lip oil seal, the first lip tip blocks leakage of the oil stored in the oil tank, and the second lip tip blocks the leakage of oil that has passed through the first lip tip once again, so that the oil remains in the oil pocket and is substantially It completely blocks the leakage of oil and at the same time helps to form a fine lubricating thin film on the lip tip to reduce friction loss and prevent hardening of the seal, and at the same time dust, wet steam, It functions as a dust strip that blocks foreign matter such as sand from entering the lip tip. The extension line of the second lip tip has a metal support for securing the assembly stiffness of the double lip oil seal and the sealing force of the lip tip, and the extension of the metal support can be mounted on the interface between the engine block and the engine oil storage tank for sealing. A crankshaft of the first and second lip tips, having a rounded garter spring mounted in a semicircular groove formed along the outer circumferential surface of the first lip tip and the second lip tip in direct contact with the engine oil. Maintains a stable elastic sealing force that can cope with rotational contact safely.

In addition, when the distance between the first lip tip and the second lip tip is very short, the two lip tips look like one lip tip. In fact, two micro lips are formed, so that the crankshaft and two micro lip tips are formed. The oil seal has a plurality of micro lip tip that serves to block the leakage of oil while rotating friction contact movement, and the dust strip is formed on the extension line of the second micro lip tip, in particular, to block foreign matter from entering the micro lip tip. By reasonably distributing the sealing pressure and installing a very small oil pocket at the tip of the micro lip, the friction loss is reduced, and the frictional heat of the lip tip and the crankshaft is prevented from being damaged and the surface hardening of the micro lip tip is prevented. To prevent abrasion of the crankshaft and friction contact with the crankshaft And prolong the life of the surface.

Compared to conventional oil seals that prevent oil leakage by one lip tip, double lip oil seals have two or more lip tips that make rotational friction contact motion with the outer circumferential surface of the crankshaft to completely block oil leakage. It is a sealing device that prevents damage to the contact surface of the crankshaft and extends its life.The first lip tip provides a function of blocking oil leakage while contacting the engine oil, and the outer circumferential surface inclined to the oil side of the first lip tip By forming a plurality of equally spaced grooves having a shape to increase the tangential flow frictional viscous resistance of the oil due to the crankshaft rotation, it pushes away the oil to enter the first lip tip, thereby reducing the pressure of the oil. Lowers the oil leakage pressure and has various shapes in the opposite direction to the outer peripheral surface inclined to the oil pocket side of the first lip tip. The leaked oil remaining in the oil pocket, which is a small space between the first and second lip tips by forming a plurality of equally spaced recesses, is introduced into the first lip by the circulation force acting to flow toward the first lip tip. Provides the ability to block the oil in the storage tank to leak through the tip, and the outer peripheral surface inclined from the oil pocket side and the air side of the second lip tip is formed similarly to the number of equally spaced recess grooves formed at the first lip tip By completely blocking the leakage of the oil passing through the first lip tip once more, and ensures the safety of leakage oil of the double lip oil seal to prevent foreign matter from entering the lip tip through the second lip tip.

In another example, the micro dual lip oil seal 130 having the dust strip 16 ′ has a first micro lip tip along the outer circumferential surface of the inner inclined surface 12 ′ ″ in contact with the engine oil at two micro lip tips. 41), the second micro tip 42 is connected to the extension line of the first micro lip tip 41 to form a small oil pocket 200 'in the space between these two micro lip tips, the first micro The lip tip 41 and the second micro lip tip 42 are in rotational friction contact motion with the outer circumferential surface of the crankshaft 100 ″, and the oil-side inner sloped surface 12 ′ ″ of the first micro lip tip 41. A plurality of inner intaglio grooves 31 'having various shapes are formed at equal intervals along the outer circumferential surface of the same), and at equal intervals along the outer circumferential surface of the outer inclined surface 13' '' of the second microlip tip 42. Outside having various shapes in the direction different from the above-mentioned inner intaglio groove 31 ' An intaglio groove 32 '' is formed, and a flex 15 '' recessed into an extension line of an outer circumferential surface connected to the outer inclined surface 13 '' ', and a dust strip is formed on the extension line of the flex 15' '. 16 ') and a metal support 17 &quot; is formed on the extension line of the dust strip 16 &quot; as an insert in the polymer material and is formed by the first microlip tip 41 and the second microlip tip 42. The circumferential elastic sealing force is firmly maintained with respect to the crankshaft 100 '', and the square indented grooves 18 'are spaced circumferentially in the outer middle section of the metal support 17' 'in contact with air. ') Forming a polymer material for contact with air and assembling the housing 19' 'of the contact boundary surface connecting the engine block and the oil storage tank along the outer circumferential surface at the other end of the metal support 17' '. (20 ''), and the other end of the first microlip tip 41 and the second microlip tip 42 A semicircular groove 21 '' is formed at an upper end contacting the engine oil along the side circumferential surface, and a garter spring 11 '' is assembled along the outer circumferential surface of the semicircular groove 21 '' to form a first microlip tip ( 41) and the second microlip tip 42 is provided with an appropriate elastic sealing force.

Hereinafter, the operation of the double-lip oil seal and the micro-trip oil seal with a dust strip according to an embodiment of the present invention.

Double-lip oil seal 120 is to block the external leakage of the engine oil, the engine oil stored in the oil tank is the oil stored in the oil tank by the crankshaft (100 ') rotation friction contact movement of the engine is the first lip tip ( The oil pressure for promoting leakage in the axial direction acts along the circumferential surface of 30), but the leakage pressure is the initial pressure in the radial direction due to the elastic force of the polymer material and the initial pressure in the radial direction of the garter spring 11 '. An elastic sealing force formed while simultaneously acting on the first lip tip 30 and the second lip tip 33 of the double lip oil seal 120 prevents leakage of engine oil, and in particular, the oil side inside of the first lip tip 30. Tangential viscous friction circulation of oil which pushes oil to be leaked away from the lip tip by entering the first lip tip 30 by the inner intaglio groove 31 having various shapes formed along the outer circumferential surface of the inclined surface 12 ′. production The oil pressure applied to the vicinity of the first lip tip 30 is reduced by the force of the first lip tip 30 so that the sealing force is relatively strengthened, and the inner intaglio groove is formed along the outer circumferential surface of the oil pocket side outer sloping surface 13 ′ of the first lip tip 30. The outer indentation groove 32 having various shapes formed in the opposite direction to the (31) stays in the oil pocket 200 which is a small space between the first lip tip 30 and the second lip tip 33. The viscous friction circulation force to push back the leaked oil in the axial direction of the first lip tip 30 acts to substantially block the oil trying to escape in the axial direction through the first lip tip 30, Oil leakage, which has passed through the first lip tip 30, is formed with another shape of the intaglio groove 31 ′ having various shapes formed along the outer circumferential surface of the oil pocket side inner sloping surface 12 ″ of the second lip tip 33. The oil leakage is directed toward the first lip tip 30 rather than the leakage pressure acting on the second lip tip 33. Since the oil leakage pressure drops while the oil leakage circulates, the oil leakage suppression flow is encouraged and has various shapes formed along the outer circumferential surface of the air side outer inclined surface 13 '' of the second lip tip 33. The outer indent groove 32 ′ effectively blocks the foreign matter that is to invade in the axial direction of the second lip tip 33. In addition, the garter spring 11 ′ assembled on the circumferential surface of the semicircular groove 21 ′ formed along the outer circumferential surface in contact with the oil of the first lip tip 30 is primarily connected to the first lip tip 30. Supplying a uniform elastic sealing force to prevent leakage of oil, and at the same time to provide a suitable sealing force to the second lip tip 33 to block the foreign foreign matter intrusion through the first lip tip 30 to remove the oil On the metal support (17 ') to block the secondary leakage again and to maintain a constant assembly strength in the polymer material mounting portion (20') formed to assemble to the housing (19 ') formed on the contact boundary surface of the engine block and the oil storage tank. As a result, the sealing property of the double-lip oil seal 120 and the structure strength are ensured.

According to the present invention, as the crankshaft of the automobile engine rotates, the kinetic frictional shear force in the tangential direction is strongly tangential to the engine oil by a plurality of equally spaced inner negative grooves having various shapes formed on the outer circumferential surface of the oil-side inner sloping surface of the first lip tip. This action lowers the pressure of the oil toward the tip of the first lip to weaken the leakage pressure, and the oil acts as a viscous friction circulation force to push away from the first lip, thereby substantially blocking the axial leakage of the oil. 1 A plurality of equally spaced outer negative grooves having various shapes formed on the outer circumferential surface of the oil pocket side outer inclined surface of the lip tip are formed in a direction opposite to the inner negative groove so that the leaked engine oil is directed toward the first lip tip. Oil pressure is applied by the viscous friction shear force of and the inner negative groove formed on the circumferential surface of the inner inclined surface of the oil pocket side of the second lip tip Viscous friction shear force acts tangentially on the small amount of oil already leaked, and the oil leaks due to the circulating force to move the oil toward the first tip end, and the leaked oil returns to the first tip end. Because of this action, axial leakage of oil through the first lip tip is suppressed, and at the same time, the oil thin film is always maintained along the outer circumferential surface of the first lip tip so that thermal damage due to frictional heat generated at the lip tip or curing of the seal material Prevents wear and tear on the surface of movement and crankshaft rotational friction.

In addition, the second lip tip formed while passing through the oil pocket, which is a small space between the first lip tip and the second lip tip, blocks the leakage from the first lip tip once more, and is an auxiliary sealing lip to prevent foreign substances from entering. As the crank shaft of the engine rotates, the second lip tip is tangentially applied to the oil leaked by oil leaked by the inner negative groove having various shapes formed on the outer circumferential surface of the inner side of the oil pocket side of the second lip tip. Oil pressure to the side drops, and the leaked oil acts as a viscous friction circulation force to push away from the second lip tip again to prevent leakage of the leaked oil in the axial direction, and to the outer circumferential surface of the air side outer slope of the second lip tip. The formed outer negative groove is formed in the opposite direction to the oil pocket side inner negative groove so that the oil leakage passing through the second lip tip is directed back to the second lip tip. While the leakage pressure acts, the oil leakage through the second lip tip is suppressed once again, and the effect of blocking foreign substances from entering through the second lip tip in contact with air is expected. 2) The oil film is always kept along the outer circumferential surface of the lip tip to prevent thermal damage or wear caused by frictional heat generated from the lip tip, hardening of the seal material and wear of the crankshaft friction contact motion surface.

An embodiment of the present invention described above and illustrated in the drawings should not be construed as limiting the technical spirit of the present invention. The protection scope of the present invention is limited only by the matters described in the claims, and those skilled in the art can change and change the technical idea of the present invention in various forms. Therefore, such improvements and modifications will fall within the protection scope of the present invention, as will be apparent to those skilled in the art.

Claims (2)

A plurality of inner intaglio grooves 31 formed at equal intervals on the inner inclined surface 12 'and a plurality of outer intaglio grooves 32 formed in a direction opposite to the direction in which the inner intaglio grooves 31 are formed on the outer inclined surface 13'. Has a first lip tip 30 formed on the side through which the oil penetrates, A plurality of inner intaglio grooves 31 'formed at equal intervals on the inner inclined surface 12 "and a plurality of outer intaglio grooves formed in a direction opposite to the direction in which the inner intaglio grooves 31' are formed on the outer inclined surface 13" ( 32 ') and formed on the side of the leaked oil through a gap between the first lip tip 30 and the crankshaft 100', and having an inner diameter larger than that of the first lip tip 30. 33), It includes an oil pocket 200 formed in the circumferential direction between the first lip tip 30 and the second lip tip 33 to retain the oil leaked through the first lip tip 30, The inner diameter of the second lip end 33 is oil seal, characterized in that to be processed larger than the inner diameter of the first lip end (30). A first microlip tip 41 having a plurality of intaglio grooves 31 &quot; formed at equal intervals on the inclined surface 12 " 'in contact with the engine oil; A second microlip tip 42 formed along an axial extension line of the first microlip tip 41; A small space for retaining oil leakage by an oil pocket 200 'formed between the first microlip tip 41 and the second microlip tip 42; The plurality of outer negative grooves 32 "formed at equal intervals on the outer inclined surface 13" 'of the second microlip tip 42 are opposite to the inner negative grooves 12 "of the first microlip tip 41. And an oil strip (16 ') formed on an extension of the second microlip tip (42) outer inclined surface (13 "').

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