Anti-wading crankshaft oil seal

Abstract

The utility model discloses an anti-wading crankshaft oil seal which comprises an inner side oil seal assembly and an outer side oil seal assembly, and the inner side oil seal assembly comprises an inner side oil seal framework and a first inner side oil seal rubber body; the inner side oil seal framework comprises a bottom wall, a first side wall and a second side wall, and the upper end of the second side wall is bent outwards to form a flanging part; the first inner side oil seal rubber body wraps the flanging part, the near end of the first inner side oil seal rubber body extends outwards and is bent downwards to form a sealing power lip, and the sealing power lip is provided with a first power spiral groove; the outer side oil seal assembly comprises an outer side oil seal framework and an outer side oil seal rubber body; the outer side oil seal framework comprises a vertical part located in the cavity, and the upper end of the vertical part extends out of the cavity and is bent outwards to form a horizontal part. The outer side oil seal rubber body wraps the horizontal part, the near end of the outer side oil seal rubber body extends outwards and is bent upwards to form a wading prevention power lip, and the wading prevention power lip is provided with a second power spiral groove.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of crankshaft oil seal, specifically to a kind of anti-water-involved crankshaft oil seal. BACKGROUND

[0002] When the car is involved in water driving, the water level should be as much as possible not more than 2 / 3 of SVU wheel, not more than 1 / 2 of car wheel. But in the season of heavy rain, sudden heavy rain, urban waterlogging is serious, leading to rapid rise of road water level, road is submerged in water, many vehicles are trapped in water, not only engine water will cause damage to engine, crankshaft front and rear end will also be waterlogged, and water will emulsify after engine oil, and then unable to provide sufficient lubricating property for engine, and using emulsified engine oil may lead to engine to appear the condition of cylinder pulling.

[0003] The existing oil seal basically does not have waterproof function, and the existing oil seal is used for water penetration test: the crankshaft front oil seal rotation speed is 1500rpm~4000rpm, every 0.5 hour, the crankshaft front oil seal water penetration amount is about 17g~95g; The water penetration amount of crankshaft rear oil seal is about 100g~260g.

[0004] Traditional rubber framework oil seal and PTFE oil seal are relatively sealed from air side to oil side to realize oil pumping from sealing principle, when involved in water, external water will be sucked into crankcase under the action of oil seal pump, and mixed with engine oil, which causes engine oil performance attenuation, moving parts damage and other problems. UTILITY MODEL CONTENTS

[0005] In view of the defects in the prior art, the utility model aims to provide an anti-water-involved crankshaft oil seal, which is sealed by two power lips, and the liquid medium to be outflowed is pressed back to the oil storage end by the sealing power lip, so as to ensure the sealing of crankshaft end and the lubrication of each part of crankcase, and the anti-water-involved lip can pump back external mud and water to air side, effectively avoiding the problem that external mud and water are sucked into crankcase under the action of oil seal pump in water-involved working condition.

[0006] The utility model discloses a kind of anti-wading crankshaft oil seals, including inner oil seal assembly and outer oil seal assembly, the inner oil seal assembly includes inner oil seal skeleton and first inner oil seal rubber body;The section of the inner oil seal skeleton is U-shaped structure, including bottom wall, the distal end of the bottom wall is bent upwards to form first side wall, the proximal end of bottom wall is bent upwards to form second side wall, and the upper end of second side wall is bent outwards to form flanging part;The bottom wall, first side wall and second side wall enclose cavity;The first inner oil seal rubber body wraps flanging part, and the proximal end of first inner oil seal rubber body extends outward and is bent downwards to form sealing power lip, and sealing power lip is provided with first power spiral groove;The outer oil seal assembly includes outer oil seal skeleton and outer oil seal rubber body;The section of the outer oil seal skeleton is inverted L-shaped structure, including vertical portion in cavity, the upper end of the vertical portion projects cavity and is bent outwards to form horizontal portion;The outer oil seal rubber body wraps horizontal portion, and the proximal end of outer oil seal rubber body extends outward and is bent upwards to form anti-wading power lip, and anti-wading power lip is provided with second power spiral groove.

[0007] Further improvement lies in that the spiral directions of the first power spiral groove and the second power spiral groove are opposite.

[0008] Further improvement lies in that the first power spiral groove and the second power spiral groove are both made of polytetrafluoroethylene material.

[0009] Further improvement lies in that the first power spiral groove and the second power spiral groove are both triangular arc-shaped structures.

[0010] Further improvement lies in that the first power spiral groove and the second power spiral groove have a circular arc radius R of 0.16±0.05 mm, a thread depth of 0.16±0.05 mm, a pitch of 0.4±0.05 mm, and a thickness of (0.4-0.7)±0.06 mm.

[0011] Further improvement lies in that the first power spiral groove is left-handed spiral, and the second power spiral groove is right-handed spiral.

[0012] Further improvement lies in that the inner oil seal assembly further includes a second inner oil seal rubber body, and the second inner oil seal rubber body wraps the first side wall.

[0013] Further improvement lies in that the first inner oil seal rubber body covers the outer side of the second side wall and extends to the bottom surface of the bottom wall, and the second inner oil seal rubber body extends to the bottom surface of the bottom wall and forms an integral structure with the first inner oil seal rubber body.

[0014] Further improvement lies in that the second inner oil seal rubber body is provided with a large wave-shaped sealing rib at the part of the outer side of the first side wall.

[0015] Further improvement lies in that the outer side oil seal rubber body covers the outer side of the vertical part and extends to the bottom surface of the vertical part.

[0016] The utility model discloses beneficial effect lies in:

[0017] The utility model discloses two power lip, sealing power lip will the liquid medium of outside flow pressure back the oil storage end, has guaranteed the sealing of crankshaft end and the lubrication of crankcase each part, and the anti -wading lip will the external silt pump back the air side, effectively avoided the problem that the external silt is inhaled into the crankcase under the oil seal pump suction under the wading working condition. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the structure schematic diagram of anti -wading crankshaft oil seal in the utility model embodiment;

[0019] Figure 2 It is the partial close -up of anti -wading crankshaft oil seal in the utility model embodiment;

[0020] Figure 3 It is the sectional view of anti -wading crankshaft oil seal in the utility model embodiment;

[0021] Figure 4 It is the structure schematic diagram of inner side oil seal assembly in the utility model embodiment;

[0022] Figure 5 It is the structure schematic diagram of inner side oil seal framework in the utility model embodiment;

[0023] Figure 6 It is the structure schematic diagram of outer side oil seal assembly in the utility model embodiment;

[0024] Figure 7 It is the structure schematic diagram of outer side oil seal framework in the utility model embodiment;

[0025] Figure 8 It is the structure schematic diagram of power spiral groove in the utility model embodiment.

[0026] REFERENCE SIGNS:

[0027] 1-inner side oil seal assembly;11-inner side oil seal framework;111-bottom wall;112-first side wall;113-second side wall;114-flange part;115-cavity;12-first inner side oil seal rubber body;121-sealing power lip;122-first power spiral groove;13-second inner side oil seal rubber body;131-large wave type sealing rib;

[0028] 2-outer oil seal assembly; 21-outer oil seal frame; 211-horizontal part; 212-vertical part; 22-outer oil seal rubber body; 221-waterproof dynamic lip; 222-second dynamic spiral groove. DETAILED DESCRIPTION

[0029] Embodiments of the present application will be described in detail below, the embodiments of the application are shown in the accompanying drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout.

[0030] In the description of the present application, it should be noted that for the terms of orientation, such as the terms "center", "lateral (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation and positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and cannot be understood as limiting the specific protection scope of the present application.

[0031] In addition, the terms "first" and "second" are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. Therefore, the "first" and "second" features defined can explicitly or implicitly include one or more of the features, and in the description of the present application, the meaning of "several" and "several" is two or more, unless otherwise explicitly specified.

[0032] The technical scheme of the present application and its beneficial effects will be clearer and more explicit through the further description of the specific embodiments of the present application in combination with the accompanying drawings of the specification. The description of the embodiments by referring to the accompanying drawings is exemplary and is intended to explain the present application, and cannot be understood as limiting the present application.

[0033] Referring to Figures 1-3 The embodiment of the present application provides a waterproof crankshaft oil seal, which comprises an inner oil seal assembly 1 and an outer oil seal assembly 2.

[0034] Referring to Figures 4-5As shown, the inner oil seal assembly 1 comprises an inner oil seal framework 11 and a first inner oil seal rubber body 12; the inner oil seal framework 11 has a U-shaped structure in cross section, comprising a bottom wall 111, a first side wall 112 formed by bending the distal end of the bottom wall 111 upward, a second side wall 113 formed by bending the proximal end of the bottom wall 111 upward, and a flange portion 114 formed by bending the upper end of the second side wall 113 outward; the bottom wall 111, the first side wall 112 and the second side wall 113 enclose a cavity 115; the first inner oil seal rubber body 12 wraps the flange portion 114, and the proximal end of the first inner oil seal rubber body 12 extends outward and is bent downward to form a sealing power lip 121, and the sealing power lip 121 is provided with a first power spiral groove 122; specifically, the inner oil seal assembly 1 further comprises a second inner oil seal rubber body 13, and the second inner oil seal rubber body 13 wraps the first side wall 112. The first inner oil seal rubber body 12 covers the outer side of the second side wall 113 and extends to the bottom surface of the bottom wall 111, and the second inner oil seal rubber body 13 extends to the bottom surface of the bottom wall 111 and forms an integral structure with the first inner oil seal rubber body 12. The second inner oil seal rubber body 13 is provided with a large wave-shaped sealing rib 131 on the part of the outer side of the first side wall 112.

[0035] Referring to Figures 6-7 As shown, the outer oil seal assembly 2 comprises an outer oil seal framework 21 and an outer oil seal rubber body 22; the outer oil seal framework 21 has an inverted L-shaped structure in cross section, comprising a vertical portion 212 located in the cavity 115, and a horizontal portion 211 formed by bending the upper end of the vertical portion 212 outward out of the cavity 115; the outer oil seal rubber body 22 wraps the horizontal portion 211, and the proximal end of the outer oil seal rubber body 22 extends outward and is bent upward to form a water-resistant power lip 221, and the water-resistant power lip 221 is provided with a second power spiral groove 222. Specifically, the outer oil seal rubber body 22 covers the outer side of the vertical portion 212 and extends to the bottom surface of the vertical portion 212.

[0036] Specifically, the spiral directions of the first power spiral groove 122 and the second power spiral groove 222 are opposite. Specifically, the first power spiral groove 122 is left-handed spiral, and the second power spiral groove 222 is right-handed spiral. The first power spiral groove 122 and the second power spiral groove 222 are both made of polytetrafluoroethylene material. The wear amount is only 0.001g, and the friction coefficient is 0.16μ, which effectively prevents the dry grinding phenomenon of the water-resistant power lip, and high-temperature grease Mobil UNIREX N3 is coated between the lips to reduce the friction torque when the lips are running, so as to achieve the same service life as the sealing lip.

[0037] Referring to Figure 8As shown, the first power spiral groove 122 and the second power spiral groove 222 are both triangular arc structures. Specifically, the arc radius R of the first power spiral groove 122 and the second power spiral groove 222 is 0.16±0.05mm, the thread depth is 0.16±0.05mm, the pitch is 0.4±0.05mm, and the thickness is (0.4-0.7)±0.06mm. This structure reduces the radial force of the lip, and the friction torque can be reduced by 25%-50%, the friction heat is reduced, the material aging degree is reduced, the "carbon deposition" phenomenon of the lip is reduced, and the service life is improved.

[0038] The sealing power lip is mainly responsible for sealing the lubricating oil in the engine, and it can press the liquid medium flowing out back to the oil storage end, and the water-proof power lip can pump the external water back to the air side, effectively avoiding the problem that the external water is sucked into the crankcase under the oil seal pump suction in the water working condition.

[0039] The assembly process of the utility model is:

[0040] 1. First, the inner rubber body, the inner oil seal framework and the polytetrafluoroethylene lip are molded and vulcanized into one whole body by a rubber mold, and then two-stage vulcanization is carried out to shape the sealing power lip into a horn shape;

[0041] 2. The outer rubber body, the outer oil seal framework and the polytetrafluoroethylene lip are molded and vulcanized into one whole body by a rubber mold, and then two-stage vulcanization is carried out to shape the water-proof power lip into a horn shape, and finally grease is applied on the water-proof power lip;

[0042] 3. The inner oil seal assembly and the outer oil seal assembly are assembled together.

[0043] In the description of the specification, the description of the reference terms "one embodiment", "preferably", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model, and the illustrative description of the above terms in the specification does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0044] Through the above description of the structure and principle, those skilled in the art should understand that the utility model is not limited to the above specific embodiments, and improvements and replacements of the technology known in the art based on the utility model fall within the protection scope of the utility model, which should be limited by the claims.

Claims

1. A water-wading crankshaft oil seal, comprising an inner oil seal assembly (1) and an outer oil seal assembly (2), characterized in that: the inner oil seal assembly (1) comprises an inner oil seal skeleton (11) and a first inner oil seal rubber body (12); the inner oil seal skeleton (11) has a U-shaped structure in cross section, comprising a bottom wall (111), a distal end of the bottom wall (111) being bent upward to form a first side wall (112), a proximal end of the bottom wall (111) being bent upward to form a second side wall (113), and an upper end of the second side wall (113) being bent outward to form a flange portion (114); the bottom wall (111), the first side wall (112) and the second side wall (113) surround a cavity (115); the first inner oil seal rubber body (12) wraps the flange portion (114), and a proximal end of the first inner oil seal rubber body (12) extends outward and is bent downward to form a sealing power lip (121), and the sealing power lip (121) is provided with a first power spiral groove (122); the outer oil seal assembly (2) comprises an outer oil seal skeleton (21) and an outer oil seal rubber body (22); the outer oil seal skeleton (21) has an inverted L-shaped structure in cross section, comprising a vertical portion (212) located in the cavity (115), and an upper end of the vertical portion (212) extending out of the cavity (115) and being bent outward to form a horizontal portion (211); the outer oil seal rubber body (22) wraps the horizontal portion (211), and a proximal end of the outer oil seal rubber body (22) extends outward and is bent upward to form a water-wading power lip (221), and the water-wading power lip (221) is provided with a second power spiral groove (222).

2. The water-intrusion resistant crankshaft oil seal of claim 1, wherein: The spiral directions of the first power spiral groove (122) and the second power spiral groove (222) are opposite.

3. The water-intrusion resistant crankshaft oil seal of claim 1, wherein: The first power spiral groove (122) and the second power spiral groove (222) are both made of polytetrafluoroethylene material.

4. The water-intrusion resistant crankshaft oil seal of claim 1, wherein: The first power spiral groove (122) and the second power spiral groove (222) are both triangular arc-shaped structures.

5. The anti-wading crankshaft oil seal of claim 4, wherein: The first power spiral groove (122) and the second power spiral groove (222) have a circular arc radius R of 0.16±0.05 mm, a thread depth of 0.16±0.05 mm, a pitch of 0.4±0.05 mm, and a thickness of (0.4-0.7)±0.06 mm.

6. The water-intrusion resistant crankshaft oil seal of claim 1, wherein: The first power spiral groove (122) is left-handed spiral, and the second power spiral groove (222) is right-handed spiral.

7. The water-intrusion resistant crankshaft oil seal of claim 1, wherein: The inner oil seal assembly (1) further comprises a second inner oil seal rubber body (13), and the second inner oil seal rubber body (13) wraps the first side wall (112).

8. The water-intrusion resistant crankshaft oil seal of claim 7, wherein: The first inner oil seal rubber body (12) covers the outer side of the second side wall (113) and extends to the bottom surface of the bottom wall (111), and the second inner oil seal rubber body (13) extends to the bottom surface of the bottom wall (111) and forms an integral structure with the first inner oil seal rubber body (12).

9. The water-intrusion resistant crankshaft oil seal of claim 7, wherein: The second inner oil seal rubber body (13) is provided with a large wave-shaped sealing rib (131) on the part located on the outer side of the first side wall (112).

10. The water-intrusion resistant crankshaft oil seal of claim 1, wherein: The outer oil seal rubber body (22) covers the outer side surface of the vertical portion (212) and extends to the bottom surface of the vertical portion (212).

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