CN217108202U - Oil seal - Google Patents

Abstract

The utility model discloses an oil seal, comprising an oil seal body, an annular outer sealing ring is arranged on the radial outer side of the oil seal body, and an annular sealing section is arranged on the radial inner side of the oil seal body, the sealing section is connected to the outer A connecting section is arranged between the sealing rings, the connecting section is located at the upper end of the outer sealing ring, the inner surface of the sealing section is an arc surface, and the sealing section extends from top to bottom toward the inside, and the bottom end of the sealing section is provided with a sealing lip, so The sealing lip has a certain thickness, the inner surface of the sealing lip is provided with a sealing lip, an annular sealing frame is arranged in the sealing lip, and the sealing lip is lower than the bottom of the outer sealing ring. The utility model has the advantages of simple structure, convenient installation, ensuring the sealing performance of the fuel injector after installation, avoiding leakage and the like.

Description

an oil seal

technical field

The utility model relates to the technical field of oil seals, in particular to an oil seal.

Background technique

A multi-cylinder engine has one injector for one cylinder. After multiple injectors are assembled on the cylinder head cover, there is a problem that the coaxiality between the injector and the injector mounting hole on the cylinder head cover is too large. The existing oil seal only relies on the rubber lip to assist in sealing with the spring, and the rubber lip is soft, resulting in a large amount of compression of the main lip at one time and a small amount of compression at one time. Leakage occurs.

Utility model content

The purpose of the utility model is to provide an oil seal, which can ensure the tightness of the oil seal to the oil injector when the coaxiality between the oil injector and the installation hole of the oil injector is too large.

In order to achieve the above purpose, the present invention includes an oil seal body, and its structural features are: an annular outer sealing ring is arranged on the radial outer side of the oil seal body, and an annular sealing section is arranged on the radial inner side of the oil seal body. A connecting section is arranged between the sealing section and the outer sealing ring, and the connecting section is located at the upper end of the outer sealing ring. The sealing lip has a certain thickness and the inner surface of the sealing lip is provided with a sealing lip, an annular sealing frame is arranged in the sealing lip, and the sealing lip is lower than the bottom of the outer sealing ring.

After the above structure is adopted, the outer surface of the outer sealing ring on the radially outer side of the oil seal abuts on the cylinder head cover, and the outer edge of the outer sealing ring abuts on the cylinder head cover to fix the position of the oil seal. It can seal the sealing lip of the fuel injector. There is a connecting section between the outer sealing ring and the sealing section. The inner sealing section is connected through the connecting section to determine the relative position of the sealing lip and the outer sealing ring. The sealing lip at the bottom of the sealing section passes through the sealing section. The lip is fitted with the injector, and the sealing lip and the injector form a face seal. Compared with the line seal, the face seal has stronger sealing performance. A compression space is formed between the sealing section and the outer sealing ring. When the oil seal is installed, The sealing section is bent and deformed to the compression space, which is convenient to fit the sealing section of the oil seal on the fuel injector, and a ring-shaped sealing frame is arranged in the sealing lip. When the fuel injector is inserted into the installation hole of the cylinder head, the sealing frame surrounds the fuel injector. , to ensure that the compression amount of the sealing lip around the injector is equal. When the coaxiality of the injector inserted into the cylinder head cover is large, the connecting section of the oil seal is bent, and the annular sealing skeleton still ensures the same compression of the sealing lip. Avoid seal failure and leakage caused by small compression.

The thickness of the sealing lip is greater than the thickness of the upper end of the sealing segment. The larger thickness of the sealing lip is convenient for accommodating the sealing frame, and at the same time, it ensures the stability during sealing and the sealing performance of the oil seal. , easy to install and improve installation efficiency.

The cross section of the sealing skeleton is a rectangular section and the rectangular section is vertically arranged, and the annular sealing skeleton is located inside the sealing lip to ensure the stability of the sealing lip. The upper and lower parts of the sealing frame are equally supported by the sealing lip, so that the compression amount of the sealing lip at the upper and lower heights is equal, which ensures the surface sealing of the sealing lip and increases the sealing performance.

The outer sealing ring is provided with an annular outer skeleton, which supports the entire oil seal, avoids serious deformation of the oil seal during installation and the working chamber of the fuel injector, and ensures the sealing of the oil seal to the fuel injector.

The outer profile shape of the cross-section of the outer skeleton is an inverted L shape, one end of the outer skeleton extends into the connecting section, and the outer skeleton extends into the connecting section, which ensures the strength and shape of the connecting section and prevents the connecting section from being sealed. When the segment is bent, it is frequently bent, which ensures the strength of the connecting segment and improves the service life.

The upper side of the sealing section is provided with a dust lip, the inner surface of the dust lip is an arc surface, and the dust lip is higher than the outer sealing ring, and the upper end of the dust lip abuts between the fuel injector and the installation hole between the gaps to prevent dust from entering the cylinder head cover and ensure the cleanliness of the interior.

The oil seal body is integrally formed, and the integrally formed design increases the stability of the oil seal during use and improves the service life.

The skeleton material of the sealed skeleton and the outer skeleton is metal or hard plastic, which ensures the support of the skeleton, facilitates production and installation, and improves economic benefits.

To sum up, the utility model has the advantages of simple structure, convenient installation, ensuring the sealing performance of the fuel injector after installation, avoiding leakage, and the like.

Description of drawings

Below in conjunction with the accompanying drawings, the specific embodiments of the present utility model are described in further detail:

Fig. 1 is the cross-sectional structure schematic diagram of the present utility model;

Fig. 2 is the structural representation after the utility model is installed;

FIG. 3 is an enlarged view of area A in FIG. 2 .

Detailed ways

1, the oil seal includes an oil seal body, and the oil seal body includes an outer sealing ring 1 located on the radially outer side and a sealing segment 3 located on the radially inner side of the oil seal. The outer sealing ring 1 and the sealing segment 3 are both annular, and the annular sealing segment 3 The lower end is provided with a sealing lip 4 , and the sealing lip 41 in the sealing lip 4 surrounds and presses the outer surface of the fuel injector 8 to seal the fuel injector 8 . The outer sealing ring 1 is in contact with the cylinder head cover 7 , and the oil seal is installed inside the cylinder head cover 7 . The inner side of the outer sealing ring 1 is provided with a connecting section 2, and the radial inner side of the connecting section 2 is provided with a sealing section 3 extending downward, and the bottom end of the sealing section 3 is provided with a sealing lip 4 against the injector 8. 4 Press the outer surface of the injector 8. The outer sealing ring 1 is provided with an outer frame 11 , and the outer frame 11 supports the outer contour and the entire oil seal, so as to avoid deformation of the oil seal and improve the sealing reliability of the sealing lip 4 . The outer frame 11 can be a metal or a hard material, which supports the outer contour of the entire oil seal, prevents deformation of the outer sealing ring 1, and ensures the sealing performance of the oil seal. In this embodiment, the cross-section of the outer frame 11 is an inverted L shape, and the L-shaped outer frame 11 extends into the connecting section 2 to enhance the strength of the connecting section 2. When the sealing section 3 deforms and squeezes the connecting section 2, it can prevent the The fracture of the connecting section 2 enhances the service life and safety of the oil seal. In other embodiments, skeletons may be provided in the outer sealing ring 1 and the connecting section 2 respectively to ensure the sealing and strength of the outer ring of the oil seal. The inner side of the sealing section 3 is arc-shaped, and the lower end of the inner side of the sealing section 3 is provided with a sealing lip 41 that is opposed to the fuel injector 8 . 8 Seal. The sealing lip 41 is closer to the inner side than the inner surface of the sealing section 3. The sealing lip 4 is provided with a sealing frame 42. The outer edge of the cross-section of the sealing frame 42 is rectangular. The rear side of the sealing lip 41 is vulcanized with a sealing frame 42. , the cross section of the sealing frame 42 is rectangular, and the height of the rectangular cross section is consistent with the height of the sealing lip 41 . When the oil seal is fitted on the fuel injector 8, the sealing frame 42 surrounds the fuel injector 8, the sealing frame 42 supports the sealing lip 4, compresses the sealing lip 41, and fits and squeezes the fuel injector 8. At the same time, the sealing lip 4 is Face sealing to ensure the tightness of the sealing lip 4. When the fuel injector 8 is installed through the mounting hole of the cylinder head cover 7, the axis of the fuel injector 8 and the mounting hole are quite different, the sealing frame 42 surrounds the fuel injector 8, the sealing section 3 is deformed and twisted, but the sealing frame 42 The distance from the fuel injector 8 remains unchanged, thereby ensuring that the compression amount of the sealing lip 41 remains unchanged, and ensuring the sealing of the sealing lip 41 to the fuel injector 8 . The sealing frame 42 avoids leakage of the sealing lip 41 due to the large difference in coaxiality between the fuel injector 8 and the mounting hole, resulting in different compression amounts of the sealing lip 41, which affects the sealing performance of the oil seal. At the same time, there is a face seal between the sealing lip 41 and the fuel injector 8, and the face seal ensures the contact area and sealing performance of the seal, making the seal tighter. The upper end of the sealing section 3 is provided with a dustproof lip 5, the upper end face of the dustproof lip 5 is higher than the upper end face of the outer sealing ring 1, the inner surface of the dustproof lip 5 is an arc surface, and the lip of the dustproof lip 5 abuts against. On the gap between the fuel injector 8 and the installation hole, the curved surface of the inner surface facilitates the outward deformation of the dust lip 5, so that the lip of the dust lip 5 fits the outer surface of the fuel injector 8 to prevent dust from entering the cylinder head cover 7, to ensure the cleanliness of the interior. In this embodiment, the oil seal body is integrally formed, and the integrally formed design increases the stability of the oil seal during use and improves the service life.

1 to 3, the oil seal is installed to seal the fuel injector 8. First, the oil seal is installed in the cylinder head cover 7, and the outer surface of the outer sealing ring 1 of the oil seal body is pressed against the cylinder head cover 7. The outer frame within ring 1 supports the shape of the oil seal. Install the fuel injector 8 through the mounting hole of the cylinder head cover 7, the fuel injector 8 passes through the sealing lip 4 of the oil seal, the sealing lip 41 of the sealing lip 4 wraps the outer edge of the squeeze injector 8, and the sealing lip 4 The sealing frame 42 surrounds the outer edge of the injector 8, squeezes the sealing lip 41 of the sealing lip 4, and the sealing lip 41 is compressed, and the sealing performance is increased. When the coaxiality between the installation holes of the fuel injector 8 and the cylinder head cover 7 is large, the sealing section 3 is bent, and the sealing frame 42 maintains the compression amount of the surrounding sealing lip 41 to ensure the sealing performance of the oil seal.

Claims (8)

1. The utility model provides an oil blanket, includes the oil blanket body, characterized by: the radial outside of oil blanket body is equipped with annular outer seal ring (1), the radial inboard of oil blanket body is equipped with annular seal segment (3), be equipped with linkage segment (2) between seal segment (3) and outer seal ring (1), linkage segment (2) are located the upper end of outer seal ring (1), the internal surface of seal segment (3) is the arcwall face and seal segment (3) from top to bottom inside extension, and seal segment (3) bottom is equipped with seal lip (4), seal lip (4) have certain thickness and seal lip (4) internal surface and are equipped with seal lip mouth (41), be equipped with annular seal skeleton (42) in seal lip (4), seal lip (4) are less than the bottom of outer seal ring (1).

2. An oil seal as defined in claim 1, wherein: the thickness of the sealing lip (4) is larger than that of the upper end of the sealing section (3).

3. An oil seal as defined in claim 1, wherein: the cross section of the sealing framework (42) is a rectangular section and the rectangular section is vertically arranged.

4. An oil seal as defined in claim 1, wherein: an annular outer framework (11) is arranged in the outer sealing ring (1).

5. An oil seal as defined in claim 4, wherein: the outer contour shape of the cross section of the outer framework (11) is in an inverted L shape, and one end of the outer framework (11) extends into the connecting section (2).

6. An oil seal as defined in claim 1, wherein: the sealing section (3) upside is equipped with dust lip (5), the internal surface of dust lip (5) is higher than outer seal ring (1) for arcwall face and dust lip (5).

7. An oil seal as defined in claim 1, wherein: the oil seal body is integrally formed.

8. An oil seal as defined in claim 4, wherein: the framework materials of the sealing framework (42) and the outer framework (11) are metal or hard plastic.

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