Engine accessory drive dust-proof oil seal

Abstract

The utility model relates to the technical field of engine oil seal, concretely is a kind of engine accessory drive dustproof oil seal. Including outer rubber ring, the outer skeleton of being embedded in the outer rubber ring, lip piece fixedly arranged in the inner side of outer rubber ring, the inner side of outer rubber ring is equipped with inner rubber ring, the inner skeleton is embedded in the inner rubber ring, and the end surface of inner rubber ring is evenly distributed with multiple obliquely arranged fins. The dustproof oil seal blows the dust and oil stain near the fin blowing open structure without increasing the number of parts, improves dustproof, heat dissipation performance. For some more severe working environment, the service life of oil seal can be greatly improved.

Description

Technical Field

[0001] This utility model relates to the technical field of engine oil seals, specifically an engine accessory drive dustproof oil seal. Background Technology

[0002] Engine accessory drive oil seal, also known as engine accessory actuator oil seal, is an important component of the engine front cover. One of its functions is to isolate the lubrication chamber from the external environment, preventing lubricating oil leakage or the entry of external contaminants such as dust and moisture. To enhance dust protection during use, a dust lip is typically added during the design process. However, under actual engine operating conditions, the dust accumulation at the front cover is much greater than that on the flywheel housing. Therefore, a more effective dustproof structure is needed to effectively isolate external dust. For example, Chinese Patent 2011203548306 discloses "An Engine Front Cover," authorized publication number CN202280531U, which integrates a crankshaft front oil seal, an oil pump assembly, and a water pump vortex chamber on the engine front cover. Another Chinese patent, 2024112575836, discloses "An Engine Oil Seal and Production Testing Equipment and Testing Method," application publication number CN119123065A. The engine oil seal in this patent includes a rubber ring. A sealing lip is fixedly installed at the center of the inner side of the rubber ring, and an annular groove is provided between the rubber ring and the sealing lip. A dustproof lip is provided on the outer surface of one end of the sealing lip, and the outer surface of the dustproof lip is inclined. A first spring is sleeved on the outer surface of the sealing lip, and the outer surface of the sealing lip has a groove for cooperating with the first spring. The inner surface of the rubber ring is wrapped with a metal skeleton, and the cross-section of the metal skeleton is L-shaped. This oil seal structure only provides protection through the sealing lip and the dustproof lip, and its dustproof effect is limited. Utility Model Content

[0003] To address the shortcomings of existing technologies, the purpose of this invention is to provide an engine accessory drive dustproof oil seal with high protection and dustproof effect by improving the structure of existing oil seals without adding additional protective parts.

[0004] The technical solution adopted by this utility model to solve the technical problem is:

[0005] The present invention provides an engine accessory drive dustproof oil seal comprising an outer rubber ring, an outer skeleton embedded in the outer rubber ring, and a lip fixedly disposed on the inner side of the outer rubber ring. An inner rubber ring is sleeved on the inner side of the outer rubber ring, and an inner skeleton is embedded in the inner rubber ring. Multiple inclined fins are evenly distributed on the end face of the inner rubber ring.

[0006] With this solution, when the inner skeleton of the dustproof oil seal rotates with the shaft, the raised fins can throw away the nearby dust and oil, preventing dust and oil from entering the gap of the seal and achieving a highly efficient dustproof effect. At the same time, the airflow generated by the rotation of the fins plays a role in heat dissipation for the oil seal itself and the shaft end.

[0007] Preferably, the lower end of the outer skeleton has an outer skeleton bending section extending inward, and the lower end of the outer rubber ring is provided with an outer rubber ring folded edge covering the outer skeleton bending section; the lower end of the inner skeleton has an inner skeleton bending section extending outward, and the lower end of the inner rubber ring is provided with an inner rubber ring folded edge covering the inner skeleton bending section, and the fin is disposed on the inner rubber ring folded edge.

[0008] In this solution, the outer skeleton and the inner skeleton are fitted together. The outer skeleton achieves a static seal with the oil seal housing, and the inner skeleton achieves a static seal with the shaft. The lip plate achieves a dynamic seal between the outer skeleton and the inner skeleton.

[0009] Preferably, a spiral groove is provided on the mating surface of the lip and the inner skeleton.

[0010] With this solution, the oil will be pumped back to the oil side during the rotation of the lip, improving the dynamic sealing effect.

[0011] Preferably, the fins are perpendicular to the end face of the inner rubber ring, and the plurality of fins form an angle of the same angle with the radial line of the inner rubber ring.

[0012] With this solution, as the fins rotate with the oil seal, dust will be thrown off by the fins, achieving a highly efficient dust prevention effect. The airflow generated by the rotation of the fins will also help dissipate heat from the oil seal itself and the shaft end.

[0013] Preferably, the fins and the inner rubber ring are an integral structure.

[0014] This solution provides a simple dustproof oil seal structure that does not increase the number of parts during production.

[0015] Thanks to the aforementioned structure, this dustproof oil seal improves dustproof and heat dissipation performance by using fins to blow away dust and oil near the structure without increasing the number of parts. For harsher working environments, this can significantly extend the service life of the oil seal. Attached Figure Description

[0016] Figure 1 This is a cross-sectional structural diagram of one embodiment of the present invention.

[0017] Figure 2 yes Figure 1 Schematic diagram of the end face structure of the oil seal in the embodiment. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] like Figure 1 , Figure 2 As shown, the engine accessory drive dustproof oil seal of this utility model includes an outer rubber ring 1, an outer skeleton 2 embedded in the outer rubber ring 1, and a lip 3 fixedly disposed on the inner side of the outer rubber ring 1. An inner rubber ring 4 is sleeved on the inner side of the outer rubber ring 1, and an inner skeleton 5 is embedded in the inner rubber ring 4. Multiple inclined fins 6 are evenly distributed on the end face of the inner rubber ring 4. The outer rubber ring 1, outer skeleton 2, lip 3, inner rubber ring 4, and inner skeleton 5 are all annular structures. The lip 3 can be made of rubber and integrated with the outer rubber ring 1, or it can be made of a more wear-resistant material than the outer rubber ring 1, such as polytetrafluoroethylene. The lower end of the outer skeleton 2 has an outer skeleton bending section 21 extending inward, making the cross-section of the outer skeleton 2 L-shaped. The lower end of the outer rubber ring 1 is provided with an outer rubber ring flange 11 covering the outer skeleton bending section 21, making the cross-sections of the outer skeleton 2 and the outer rubber ring 1 L-shaped. The lower end of the inner skeleton 5 has an inner skeleton bending section 51 extending outward, and the lower end of the inner rubber ring 4 is provided with an inner rubber ring flange 41 covering the inner skeleton bending section 51, so that the cross-section of the inner skeleton 5 and the inner rubber ring 4 is in the shape of a capital letter J. The fin 6 is a sheet-like structure, and the fin 6 and the inner rubber ring 4 are an integral structure, both made of rubber material. Figure 2 As shown, fins 6 are positioned perpendicular to the end face of the inner rubber ring 4 on the inner rubber ring's folded edge 41. Each fin 6 forms a certain angle with the radial line of the inner rubber ring 4, and multiple fins 6 form the same angle with the radial line of the inner rubber ring 4. This allows the inner rubber ring 4 to rotate, causing the airflow near the end face of the inner rubber ring 4 to form a swirling flow, pushing nearby dust outwards and thus preventing dust accumulation. The number of fins 6 can be 3-8, and the angle between the fins 6 and the radial line of the inner rubber ring 4 can be set from 5° to 45°.

[0020] In addition, a spiral groove 31 is provided on the mating surface of the lip 3 and the inner skeleton 5.

[0021] like Figure 1As shown, in use, the inner rubber ring 4 is fitted onto the shaft end. The elasticity of the rubber material, combined with the rigidity of the inner skeleton 5, creates a tight interference fit with the shaft end. Rotation of the shaft end causes the inner rubber ring 4 to rotate synchronously, resulting in a static seal between the inner rubber ring 4 and the shaft end. The fins 6 on the end face of the inner rubber ring 4 generate airflow, which serves two purposes: pushing away dust (dust prevention) and dissipating heat. The outer rubber ring 1 is interference-fitted into the oil seal housing, fitted outside the inner rubber ring 4, and also forms a static seal with the oil seal housing. When the inner rubber ring 4 rotates, the lip 3 adheres to the inner skeleton 5 in a circular motion, creating a dynamic seal between the lip 3 and the inner skeleton 5. The spiral groove 31 on the lip 3 continuously pumps oil back to the oil side, improving the dynamic sealing effect.

[0022] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An engine accessory drive dust seal, comprising an outer rubber ring (1), an outer skeleton (2) embedded in the outer rubber ring (1), and a lip (3) fixedly disposed on the inner side of the outer rubber ring (1), characterized in that, An inner rubber ring (4) is fitted inside the outer rubber ring (1), and an inner skeleton (5) is embedded in the inner rubber ring (4). Multiple inclined fins (6) are evenly distributed on the end face of the inner rubber ring (4).

2. The engine accessory drive dustproof oil seal according to claim 1, characterized in that, The lower end of the outer skeleton (2) has an outer skeleton bending section (21) extending inward, and the lower end of the outer rubber ring (1) is provided with an outer rubber ring fold (11) covering the outer skeleton bending section (21); the lower end of the inner skeleton (5) has an inner skeleton bending section (51) extending outward, and the lower end of the inner rubber ring (4) is provided with an inner rubber ring fold (41) covering the inner skeleton bending section (51), and the fin (6) is provided on the inner rubber ring fold (41).

3. The engine accessory drive dustproof oil seal according to claim 1 or 2, characterized in that, A spiral groove (31) is provided on the mating surface of the lip (3) and the inner skeleton (5).

4. The engine accessory drive dustproof oil seal according to claim 1 or 2, characterized in that, The fins (6) are perpendicular to the end face of the inner rubber ring (4), and the multiple fins (6) form the same angle with the radial line of the inner rubber ring (4).

5. An engine accessory drive dust wiper seal according to claim 1 or 2, wherein, The fins (6) and the inner rubber ring (4) are an integrated structure.

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