CN215059479U

CN215059479U - Crankshaft rear oil seal of engine

Info

Publication number: CN215059479U
Application number: CN202121129364.1U
Authority: CN
Inventors: 艾龙辉; 杨闯; 殷志雄; 乐毅; 黄越杏
Original assignee: Jiangxi Isuzu Engine Co ltd
Current assignee: Jiangxi Isuzu Engine Co ltd
Priority date: 2021-05-25
Filing date: 2021-05-25
Publication date: 2021-12-07
Anticipated expiration: 2031-05-25

Abstract

The utility model discloses an oil blanket behind bent axle of engine, its structure includes back oil blanket inner frame, back oil blanket sealing lip, back oil blanket outer frame, felt circle and oil return tank, through lie in oil blanket behind the bent axle setting back oil blanket inner frame and bent axle rear end axle journal interference fit, rotate along with the bent axle, and set up four at least equidistance corrugate oil return tanks on the inner surface of back oil blanket inner frame, then be provided with back oil blanket sealing lip on the back oil blanket outer frame, through firm the bonding on the outer frame of vulcanizing, back oil blanket sealing lip keeps certain compressive capacity and the contact of back oil blanket inner frame internal surface, solved and present along with engine detonation, power moment of torsion constantly improves, the problem of oil blanket oil leakage oil behind the bent axle often can appear, because sealing lip and bent axle journal relative motion, sealing lip structure is single, the oil leak of easy wearing and tearing, and to the rough surface of bent axle journal, High surface hardness requirement and high processing cost, and causes the problems of engine failure and low reliability.

Description

Crankshaft rear oil seal of engine

Technical Field

The utility model relates to an engine parts technical field especially relates to an oil blanket behind bent axle of engine.

Background

The crankshaft rear oil seal is one of important sealing elements at the rear end of an engine, is arranged between a journal at the rear end of the crankshaft of the engine and a flywheel shell or a rear bearing seat, plays a role in sealing and ensures the normal and effective operation of the engine. However, with the increasing of the detonation pressure and the power torque of the engine, the problem of oil leakage and oil leakage of the rear oil seal of the crankshaft often occurs, and due to the relative motion of the sealing lip and the crankshaft journal, the sealing lip has a single structure, is easy to wear and leak oil, and has high requirements on the surface roughness and the surface hardness of the crankshaft journal, and high processing cost, so that the engine has low failure and reliability.

Therefore, there is a need for an engine crankshaft rear oil seal with high sealing performance, low cost, and high reliability.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

In order to overcome the defects of the prior art, the rear oil seal of the crankshaft of the engine is provided, so that the problems that oil leakage and oil leakage of the rear oil seal of the crankshaft often occur along with the explosion pressure and the continuous improvement of power torque of the engine are solved.

(II) technical scheme

The utility model discloses a following technical scheme realizes: the utility model provides a crankshaft rear oil seal of an engine, which comprises a rear oil seal inner framework, wherein the rear oil seal inner framework is in interference fit with a crankshaft rear end shaft neck and rotates along with a crankshaft;

and an oil return groove is formed in the upper end of the inner surface of the inner framework of the rear oil seal.

Furthermore, the crankshaft rear oil seal is in an arc shape.

Furthermore, the oil return grooves are provided with at least four corrugated grooves with equal intervals.

Further, the oil return groove is in a counterclockwise direction or is consistent with the rotation direction of the engine crankshaft when viewed from the direction of the inner end face.

Furthermore, a rear oil seal outer framework is arranged on the rear oil seal inner framework.

Furthermore, the outer framework of the rear oil seal is in interference fit with the center hole of the flywheel shell or the center hole of the rear bearing seat.

Furthermore, a rear oil seal sealing lip is arranged on the rear oil seal outer framework.

Furthermore, the rear oil seal sealing lip is firmly bonded on the rear oil seal outer framework through vulcanization, and the rear oil seal sealing lip keeps a certain compression amount and is tightly contacted with the inner surface of the rear oil seal inner framework.

Furthermore, a felt ring is arranged at the rear end of the rear oil seal sealing lip, and is firmly fixed on the rear oil seal sealing lip in a bonding mode and is in contact with the inner framework of the rear oil seal.

(III) advantageous effects

Compared with the prior art, the utility model, following beneficial effect has:

1. the utility model discloses an it is provided with back oil blanket inner frame to lie in bent axle back oil blanket, with bent axle rear end axle journal interference fit, rotates along with the bent axle, prevents that lubricating oil from leaking outward, and back oil blanket seal lip is not sealed with bent axle journal surface direct contact, and is not very high to bent axle diameter of a shaft surface roughness, surface hardness requirement, reduces bent axle surface wear and manufacturing cost.

2. And at least four equidistant corrugated oil return grooves are formed in the upper end of the inner surface of the inner framework of the rear oil seal, and the oil return grooves are anticlockwise or consistent with the rotation direction of an engine crankshaft when viewed from the direction of a sealing surface, so that lubricating oil in the oil return grooves is thrown back into the engine, and the sealing performance and the reliability of the rear oil seal are ensured.

3. The rear oil seal lip is arranged on the rear oil seal outer framework and firmly bonded on the outer framework through vulcanization, the rear oil seal lip keeps a certain compression amount and tightly contacts with the inner surface of the rear oil seal inner framework to form a sealing area, so that the lubricating oil in an engine is prevented from leaking, and the sealing property and the service life of the rear oil seal are improved.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:

FIG. 1 is a schematic structural view of a rear oil seal of a crankshaft according to the present invention;

FIG. 2 is a partial cross-sectional view of the rear oil seal A-A of the crankshaft of the present invention;

FIG. 3 is a partial enlarged view of the rear oil seal B of the crankshaft of the present invention;

in the figure: a rear oil seal inner framework-1, a rear oil seal sealing lip-2, a rear oil seal outer framework-3, a felt ring-4 and an oil return groove-5.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

Referring to fig. 1, 2 and 3, the present invention provides a rear oil seal for a crankshaft of an engine, including a rear oil seal inner frame 1, wherein the rear oil seal inner frame 1 is in interference fit with a crankshaft rear end journal and rotates together with the crankshaft;

the upper end of the inner surface of the rear oil seal inner framework 1 is provided with an oil return groove 5.

The rear oil seal of the crankshaft is in an arc shape, so that the inner framework 1 of the rear oil seal can be conveniently fixed, and the operation is simpler and more convenient.

The number of the oil return grooves 5 is at least four, and the oil return grooves 5 are equidistant corrugated grooves, so that lubricating oil entering the oil groove can be conveniently stored.

The oil return groove 5 is counterclockwise or consistent with the rotation direction of the engine crankshaft when viewed from the inner end face direction, so that lubricating oil in the oil return groove 5 is thrown back into the engine, and the sealing performance and the reliability of the rear oil seal are ensured.

Wherein, back oil blanket outer frame 3 is set up on the back oil blanket inner frame 1, guarantees the body structural strength of back oil blanket, avoids because the rotation in-process of high strength, leads to the cracked condition.

The rear oil seal outer framework 3 is in interference fit with a flywheel shell center hole or a rear bearing seat center hole, so that the rear oil seal outer framework is convenient to fix and prevents lubricating oil of the oil return groove 5 from leaking outwards.

Wherein, be provided with back oil blanket sealing lip 2 on the back oil blanket outer frame 3, be convenient for fix back oil blanket outer frame 3, the material is light and wear-resisting, is difficult because the loss needs often to be changed.

The rear oil seal lip 2 is firmly bonded to the rear oil seal outer framework 3 through vulcanization, the rear oil seal lip 2 keeps a certain compression amount and tightly contacts with the inner surface of the rear oil seal inner framework 1, a sealing area is conveniently formed, and lubricating oil in an engine is guaranteed not to leak.

Wherein, back oil blanket seal lip 2 rear end is provided with felt 4 to firm on back oil blanket seal lip 2 through the mode that bonds, with the contact of back oil blanket inner frame 1, prevent that dust and foreign matter from getting into in the engine, influencing holistic work progress, causing the damage of engine.

The working principle is as follows: a rear oil seal inner framework 1 is arranged in a crankshaft rear oil seal of an engine, is in interference fit with a crankshaft rear end shaft neck and rotates along with a crankshaft, a rear oil seal outer framework 3 is arranged at the upper end in the rear oil seal inner framework 1 to ensure the structural strength of a body of a rear oil seal and is in interference fit with a flywheel shell center hole or a rear bearing seat center hole, a rear oil seal sealing lip 2 is arranged on the rear oil seal outer framework 3 and is firmly bonded on the rear oil seal outer framework 3 through vulcanization, the rear oil seal sealing lip 2 keeps a certain compression amount and is tightly contacted with the inner surface of the rear oil seal inner framework 1 to form a sealing area, an oil return groove 5 is arranged at the upper end of the inner surface of the rear oil seal, which is contacted with the rear oil seal inner framework 1, a felt ring 4 is arranged at the rear end of the rear oil seal lip 2, and is firmly contacted with the rear oil seal inner framework 1 through a bonding mode, thereby completing the work.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the description in the above embodiments and the description is only preferred examples of the present invention, and is not intended to limit the present invention, and that the present invention can have various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications all fall into the scope of the claimed invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The crankshaft rear oil seal of the engine is characterized by comprising a rear oil seal inner framework (1), wherein the rear oil seal inner framework (1) is in interference fit with a crankshaft rear end shaft neck and rotates along with a crankshaft;

and an oil return groove (5) is formed in the upper end of the inner surface of the rear oil seal inner framework (1).

2. The crankshaft rear oil seal of the engine according to claim 1, characterized in that: the rear oil seal of the crankshaft is in an arc shape.

3. The crankshaft rear oil seal of the engine according to claim 1, characterized in that: the oil return grooves (5) are at least four, and the oil return grooves (5) are corrugated grooves with equal intervals.

4. The crankshaft rear oil seal of the engine according to claim 1, characterized in that: the oil return groove (5) is in a counterclockwise direction or consistent with the rotation direction of the engine crankshaft when viewed from the direction of the inner end surface.

5. The crankshaft rear oil seal of the engine according to claim 1, characterized in that: and a rear oil seal outer framework (3) is arranged on the rear oil seal inner framework (1).

6. The crankshaft rear oil seal of the engine according to claim 5, characterized in that: and the rear oil seal outer framework (3) is in interference fit with a center hole of the flywheel shell or a center hole of the rear bearing seat.

7. The crankshaft rear oil seal of the engine according to claim 5, characterized in that: and a rear oil seal sealing lip (2) is arranged on the rear oil seal outer framework (3).

8. The crankshaft rear oil seal of the engine according to claim 7, characterized in that: the rear oil seal sealing lip (2) is firmly bonded on the rear oil seal outer framework (3) through vulcanization, and the rear oil seal sealing lip (2) keeps a certain compression amount and is tightly contacted with the inner surface of the rear oil seal inner framework (1).

9. The crankshaft rear oil seal of the engine according to claim 8, wherein: the rear end of the rear oil seal lip (2) is provided with a felt ring (4), and the felt ring is firmly adhered to the rear oil seal lip (2) and is contacted with the rear oil seal inner framework (1).