Oil seal self-sealing structure of hub bearing unit with long service life

Abstract

A long-life hub bearing unit oil seal self-sealing structure comprises an oil seal body and an oil slinger, the oil seal body and the oil slinger are rotationally connected with each other, the oil seal body comprises a side lip, an oil sealing lip and a grease sealing lip, the oil slinger is installed on a bearing and rotates along with the bearing, and the grease slinger is installed on the side lip. The oil seal body is installed on a hub and keeps static with the hub. According to the long-service-life hub bearing unit oil seal, a box type self-sealing structure is adopted, the side lips are additionally arranged, abrasion of impurities in lubricating liquid to the oil seal lips is effectively blocked, direct impact abrasion of the lubricating liquid to the oil seal lips is avoided, the service life of the oil seal is prolonged, and after-sale use and maintenance cost is reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of sealing wheel hub bearing units for heavy-duty commercial vehicles, and in particular to a self-sealing structure for oil seals of long-life wheel hub bearing units. Background Technology

[0002] In the field of wheel hub bearing unit sealing for heavy-duty commercial trucks, the commonly used method is to use a single oil seal structure on the outside of the wheel hub to seal the leakage of lubricating oil, and a composite seal on the inside of the wheel hub to seal the mud and water from the outside and the grease on the bearing side.

[0003] For example, a hub bearing unit sealing structure with authorization announcement number CN209557501U has grooves on the outer ring of the bearing. The grooves mainly serve a buffer function, allowing water or impurities entering from the second channel to enter the grooves, preventing water or impurities from directly entering the first channel, thus optimizing the performance of the sealing structure.

[0004] However, the wheel hub bearing unit sealing structure mentioned above still has some problems in use. For example, most wheel hub bearing unit sealing structures in domestic heavy-duty commercial trucks currently use single-unit oil seals to seal lubricating oil leakage. However, wheel hub bearing units require long service life and maintenance-free operation. Therefore, wear of mechanical parts in the lubricating fluid produces abrasive particles that deposit. These particles directly affect the oil seal lip during vehicle operation, leading to lip wear and unstable sealing, resulting in early leakage. Traditional single-unit seal structures do not have the ability to prevent abrasive particles from impacting the lip and have a short service life. Therefore, designing a long-life oil seal structure that meets the requirements of use, so that it can meet the requirements of sealing lubricating oil while having a long service life and reducing after-sales maintenance costs, has become an urgent problem to be solved. Summary of the Invention

[0005] This utility model aims to solve the problems existing in the prior art by providing a long-life wheel hub bearing unit oil seal self-sealing structure. This structure achieves the effect of increasing the filtration of impurities in the lubricating oil while ensuring the oil sealing function, thereby extending the service life of the oil seal by reducing the wear of the sealing lip by abrasive particles in the oil, and reducing after-sales use and maintenance costs.

[0006] The technical solution adopted by this utility model to solve its technical problem is as follows:

[0007] A long-life wheel hub bearing unit oil seal self-sealing structure is designed, including an oil seal body and an oil slinger ring. The oil seal body and the oil slinger ring are rotatably connected to each other. The oil seal body includes a side lip, an oil sealing lip, and a grease sealing lip. The oil slinger ring is installed on the bearing and rotates with the bearing. The oil seal body is installed on the wheel hub and remains stationary with the wheel hub.

[0008] Further improvements include a rotatable connection between the side lip and the oil-slinging ring, a spring fitted onto one side of the sealing lip, and a movable connection between the sealing lip and the oil-slinging ring.

[0009] Further improvements include the addition of a frame that is movably connected to one side of the side lip, and an assembly support that is fixedly installed on the rear side of the frame.

[0010] To further improve the design, the oil slinger ring is made of stainless steel.

[0011] In a further improvement, the oil seal body and the oil slinger ring rotate relative to each other, forming a seal through interference fit of the lip.

[0012] The beneficial effects of this utility model are: This utility model adopts a box-type self-sealing structure for sealing, and adds a side lip, which effectively prevents impurities in the lubricant from wearing the sealing lip, avoids the impact wear of the lubricant on the sealing lip, extends the service life of the oil seal, and reduces after-sales use and maintenance costs. Attached Figure Description

[0013] Figure 1 This is a front sectional view of the present invention;

[0014] Figure 2 for Figure 1 Enlarged sectional view of section A in the middle;

[0015] Figure 3 for Figure 1 Enlarged cross-sectional view of section B.

[0016] Explanation of reference numerals in the attached drawings: 1. Side lip, 2. Oil sealing lip, 3. Grease sealing lip, 4. Oil slinger ring, 5. Spring, 6. Skeleton, 7. Assembly support, 8. Oil seal body. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings:

[0018] Example 1:

[0019] See attached document Figure 1-3 In this embodiment, a long-life wheel hub bearing unit oil seal self-sealing structure includes an oil seal body 8 and an oil slinger ring 4. The oil seal body 8 and the oil slinger ring 4 are rotatably connected to each other. The oil seal body 8 includes a side lip 1, an oil sealing lip 2 and a grease sealing lip 3. The oil slinger ring 4 is installed on the bearing and rotates with the bearing. The oil seal body 8 is installed on the wheel hub and remains stationary with the wheel hub. The oil seal and the oil slinger ring rotate relative to each other and form a seal through the interference fit of the lip.

[0020] The side lip 1 is rotatably connected to the oil slinger ring 4. The oil seal body 8 is provided with three sealing lips. When combined with the oil slinger ring 4, the side lip 1 of the oil seal isolates impurities in the lubricating fluid when the oil slinger ring 4 rotates, preventing impurities from entering the sealing lip 2. A spring 5 is sleeved on one side of the sealing lip 2. The sealing lip 2 adopts a relatively common cut lip. The sealing lip 2 is sleeved with spring 5, which mainly plays the role of sealing the lubricating fluid. The sealing lip 2 and the oil slinger ring 4 cooperate to prevent the loss of grease from the bearing side. The three-ring sealing design reduces the wear rate of the sealing lip, which plays the role of cooling and extending the service life of the oil seal.

[0021] The sealing lip 3 and the oil slinger ring 4 are movably connected. A skeleton 6 is movably connected to one side of the side lip 1. An assembly support 7 is fixedly installed on the rear side of the skeleton 6. Both the assembly support 7 and the skeleton 6 are existing technologies. Their models and materials can refer to the existing technologies disclosed in the "GBT9877-2008 Standard for Design Specification of Lip Seal Ring for Hydraulic Transmission Rotary Shaft". The assembly support 7 adopts an inner skeleton wave-shaped structure, which can play the main supporting and fixing role. The oil slinger ring 4 is made of stainless steel. The stainless steel oil slinger ring 4 can improve the service life of the oil slinger ring 4 through the hardness, strength and corrosion resistance of stainless steel. The oil seal body 8 and the oil slinger ring 4 rotate relative to each other, and a seal is formed by interference fit of the lip.

[0022] By adding a side lip 1 to protect the sealing lip 2, early leakage of lubricating oil in the axle housing is avoided. On the other hand, changing the orientation of the grease sealing lip 3 prevents the loss of bearing grease, ensures bearing lubrication, extends the service life of the oil seal, and reduces after-sales maintenance costs.

[0023] Working principle:

[0024] In this long-life wheel hub bearing unit oil seal self-sealing structure, compared with the traditional single-unit sealing structure, the wheel hub bearing unit oil seal is a box-type self-sealing structure. At the same time, the oil seal adopts a side lip design to cooperate with the end face of the oil slinger ring to form a seal. This cooperation method isolates impurities and abrasive particles in the lubricant, which can extend the oil seal life. In addition, the oil seal grease lip adopts a three-ring stepped arrangement design to reduce the wear of the secondary lip and has a pressure balancing effect.

[0025] The oil seal body 8 is equipped with three sealing lips. When combined with the oil slinger ring 4, the side lip 1 of the oil seal isolates impurities in the lubricant when the oil slinger ring 4 rotates, preventing impurities from entering the sealing lip 2. A spring 5 is sleeved on one side of the sealing lip 2. The sealing lip 2 adopts a relatively common cut lip. The sealing lip 2 is sleeved with spring 5, which mainly plays a role in sealing the lubricant. The sealing lip 2 and the oil slinger ring 4 cooperate to prevent the loss of grease from the bearing side. The three-ring sealing design reduces the wear rate of the sealing lip, which plays a role in cooling and extending the service life of the oil seal.

[0026] Although the present invention has been illustrated and described with reference to preferred embodiments, those skilled in the art should understand that various changes in form and detail are possible within the scope of the claims.

Claims

1. A long-life wheel hub bearing unit oil seal self-sealing structure, comprising an oil seal body (8) and an oil slinger ring (4), wherein the oil seal body (8) and the oil slinger ring (4) are rotatably connected to each other, characterized in that: The oil seal body (8) includes a side lip (1), an oil sealing lip (2) and a grease sealing lip (3). The oil slinger ring (4) is mounted on the bearing and rotates with the bearing. The oil seal body (8) is mounted on the hub and remains stationary with the hub. The side lip (1) and the oil slinger ring (4) are rotatably connected. A spring (5) is sleeved on one side of the oil sealing lip (2). The grease sealing lip (3) and the oil slinger ring (4) are movably connected. A skeleton (6) is movably connected to one side of the side lip (1). An assembly support (7) is fixedly installed on the rear side of the skeleton (6).

2. The long-life wheel hub bearing unit oil seal self-sealing structure according to claim 1, characterized in that: The oil-slinging ring (4) is made of stainless steel.

3. The long-life wheel hub bearing unit oil seal self-sealing structure according to claim 1, characterized in that: The oil seal body (8) and the oil slinger ring (4) rotate relative to each other, and a seal is formed by interference fit of the lip.

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