A new low-friction torque sealing ring

Abstract

The utility model discloses a patent relates to the field of automobile bearing, especially a new low friction torque seal ring, include: metal ring framework, its section is L shape, rubber body, vulcanization is covered on metal ring framework, first sealing lip, second sealing lip and third sealing lip are respectively integral vulcanization and are formed in the different position of rubber body, wherein, first sealing lip extends along the axial direction outward, and its end is bent to form the bending part of a specific angle to the seal ring outside, and the bending angle alpha of bending part is 5 to 45, when the bending part of first sealing lip contacts with the cooperation axle, and the bending part is compressed deformation, so that the bending part only partial area forms line contact or narrow strip contact with the cooperation axle, and not entire lip surface fits contact. The utility model discloses through setting up 5 to 45 of the bending part in the end of first sealing lip, makes the local line contact or narrow strip contact of lip and cooperation axle, reduces the friction area, and effectively reduces the friction torque.

Description

Technical Field

[0001] This utility model relates to the field of mechanical seal technology, and in particular to a novel low-friction torque sealing ring. Background Technology

[0002] The sealing ring works in conjunction with the mating parts to form a critical seal in the bearing or hub unit, preventing foreign objects such as mud, dust, and impurities from entering the bearing and causing damage to the raceway and rolling elements. At the same time, it prevents internal lubricating grease leakage and avoids abnormal noise or failure due to insufficient lubrication.

[0003] However, the core of a sealing ring's sealing function lies in the interference fit between its sealing lip and the mating parts. This interference fit inevitably generates frictional torque. The magnitude of this frictional torque directly determines the resistance during the rotation of bearings or wheel hubs, thus affecting the starting torque and rotational torque of a car, and ultimately impacting the fuel consumption of gasoline vehicles or the driving range of electric vehicles. With energy efficiency receiving increasing attention, reducing the frictional torque of rotating components, especially that generated by sealing rings, has become a continuous goal pursued by the industry.

[0004] To reduce frictional torque, numerous explorations have been undertaken in existing technologies. For example, the applicant's previously granted utility model patent, CN215980815U, discloses a low-friction torque sealing ring. This sealing ring employs a structure where a metal skeleton is vulcanized and coated with a rubber body. The rubber body has multiple sealing lips, and the main structure of its sealing lips still adopts the traditional "ploughing" low-torque straight-face design, meaning the end of the sealing lip is a straight surface, extending horizontally or radially. Under interference fit, this straight-lip structure tends to form a wide strip-shaped contact surface or near-surface contact with the mating shaft. Although micro-surface treatment optimizes the surface's microscopic oil storage capacity, this relatively large contact area remains a key bottleneck restricting further reduction of frictional torque. The wider contact surface not only results in relatively high frictional resistance but also, under harsh working conditions containing abrasive particles such as mud and sand, easily leads to abrasive particles embedding into the lip surface, exacerbating local wear and temperature rise. Furthermore, there is still a risk of accelerated aging and failure of the lip during long-term operation.

[0005] Therefore, under the premise of ensuring or even improving sealing reliability, how to break through the limitation of large contact area of ​​traditional straight lip structure, achieve fundamental optimization of the contact mode between sealing lip and mating shaft, so as to further significantly reduce friction torque and improve lip durability, has become a technical problem that urgently needs to be solved in this field. Utility Model Content

[0006] To address the problems mentioned in the background art, this utility model provides a novel low-friction torque sealing ring. By setting a 5° to 45° bend at the end of the first sealing lip, the lip and the mating shaft form a partial line contact or narrow band contact, reducing the friction area, effectively reducing the friction torque, and extending the sealing life.

[0007] The technical solution adopted by this utility model to solve its technical problem is as follows: a novel low-friction torque sealing ring is provided, comprising: a metal ring skeleton with an L-shaped cross-section; a rubber body vulcanized and coated on the metal ring skeleton; a first sealing lip, a second sealing lip, and a third sealing lip, which are integrally formed at different positions on the rubber body; wherein, the first sealing lip extends outward along the axial direction, and its end bends outward to form a bent portion at a specific angle, the bending angle α of which ranges from 5° to 45°; when the bent portion of the first sealing lip contacts the mating shaft, the bent portion is compressed and deformed, so that only a part of the bent portion forms line contact or narrow band contact with the mating shaft, rather than the entire lip surface is in contact.

[0008] Furthermore, the rubber body forms a radial protrusion on the outer side of the metal ring skeleton mounting end for axial positioning and installation of the sealing ring.

[0009] Furthermore, in the installed state, lubricating oil is filled between the first sealing lip and the mating shaft, between the second sealing lip and the mating shaft, and between the third sealing lip and the mating shaft.

[0010] Furthermore, the first sealing lip, the second sealing lip, and the third sealing lip are respectively interference-fitted with the flange.

[0011] Furthermore, the metal ring frame is made of SPCC, SUS430, or SUS304.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] (1) By setting a 15°-35° bend at the end of the first sealing lip, the lip and the mating shaft form a local line contact or narrow band contact, reducing the friction area by more than 60%, effectively suppressing temperature rise and extending the sealing life.

[0014] (2) The first sealing lip of this utility model resists the impact of large particles of mud and sand; the second sealing lip intercepts mud and water and fine sand particles; the axially convex third sealing lip prevents grease leakage, forming a synergistic mechanism of graded filtration and dynamic sealing. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a novel low-friction torque sealing ring according to this utility model;

[0016] Figure 2 This is a utility model Figure 1 A structural schematic diagram of the sealing ring and sealing ring cover in their assembled state;

[0017] Figure 3 This is another structural schematic diagram of a novel low-friction torque sealing ring according to this utility model;

[0018] Figure 4 This is a utility model Figure 3 A structural schematic diagram of the sealing ring and sealing ring cover in their assembled state;

[0019] Figure 5 This is another structural schematic diagram of a novel low-friction torque sealing ring according to this utility model;

[0020] Figure 6 This is a utility model Figure 5 A structural schematic diagram of the sealing ring and sealing ring cover in their assembled state;

[0021] The components in the attached diagram are labeled as follows: 1. Sealing ring skeleton; 2. Rubber body; 3. Radial protrusion; 4. First sealing lip; 41. Bend; 5. Second sealing lip; 6. Third sealing lip. Detailed Implementation

[0022] 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 scope of protection of the present utility model.

[0023] Example:

[0024] As attached Figure 1 , Figure 3 , Figure 5 As shown, this utility model relates to a novel low-friction torque sealing ring, characterized by comprising: a metal ring skeleton 1 with an L-shaped cross-section; a rubber body 2, vulcanized and coated on the metal ring skeleton 1; a radial protrusion 3 formed on the outer side of the mounting end of the metal ring skeleton 1 on the rubber body 2, used for axial positioning and installation of the sealing ring. A first sealing lip 4, a second sealing lip 5, and a third sealing lip 6 are integrally formed at different positions on the rubber body 2; the first sealing lip 4, the second sealing lip 5, and the third sealing lip 6 are respectively interference-fitted with the flange. The first sealing lip 4 extends axially outward, and its end bends outward towards the outside of the sealing ring to form a bent portion 41 at a specific angle, the bending angle α of which ranges from 5° to 45°; when the bent portion 41 of the first sealing lip 4 contacts the mating shaft, the bent portion 41 is compressed and deformed, so that only a portion of the bent portion 41 forms line contact or narrow band contact with the mating shaft.

[0025] Specifically, in the installed state, lubricating oil is filled between the first sealing lip 4 and the mating shaft, between the second sealing lip 5 and the mating shaft, and between the third sealing lip 6 and the mating shaft.

[0026] Specifically, the metal ring frame 1 is made of SPCC, SUS430 or SUS304.

[0027] Specifically, such as Figure 1 As shown, the first sealing lip 4 is located on the outermost side of the rubber body 2 and protrudes axially to form the first sealing line, which is used to block the direct impact of large particles of mud and sand from the outside. The second sealing lip 5 protrudes radially inward and is located inside the first sealing lip 4, forming the second sealing line, which is used to block mud and water and a small amount of fine mud and sand that may enter after passing through the first sealing lip 4. The third sealing lip 6 protrudes axially inward and is located inside the second sealing lip 5, forming an oil-blocking layer, which is used to prevent the grease in the bearing cavity from leaking outward.

[0028] Specifically, such as Figure 2 , Figure 4 and Figure 6 The diagram shown is a structural schematic of the sealing ring and sealing ring cover in their assembled state. Figure 3 As shown, the second sealing lip 5 is located on the outermost side of the rubber body 2 and protrudes axially to form the first sealing line, which is used to block the direct impact of large particles of mud and sand from the outside. The first sealing lip 4 protrudes radially inward and is located inside the second sealing lip 5, forming the second sealing line, which is used to block mud and water and a small amount of fine mud and sand that may enter after passing through the second sealing lip 5. The third sealing lip 6 protrudes axially inward and is located inside the second sealing lip 5, forming an oil-blocking layer, which is used to prevent grease in the bearing cavity from leaking outward.

[0029] Working principle: When the shaft rotates, the bent part at the end of the first sealing lip forms a local line contact of 0.015-0.025mm with the shaft. Through elastic deformation, a directional rebound force is generated, which reduces the friction area by 60% while maintaining the sealing pressure. Large particles of mud and sand are bounced away by the axial structure of the first lip. Mud, water and fine sand are decelerated and intercepted by the radial centripetal pressure of the second lip. The bearing grease is blocked by the axial interference structure of the third lip with a reverse sealing gradient.

[0030] 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. A novel low-friction torque sealing ring, characterized in that, include: The metal ring frame (1) has an L-shaped cross-section; The rubber body (2) is vulcanized and coated onto the metal ring skeleton (1); The first sealing lip (4), the second sealing lip (5), and the third sealing lip (6) are integrally vulcanized at different positions on the rubber body (2); The first sealing lip (4) extends outward along the axial direction, and its end bends outward to form a bend (41) at a specific angle. The bending angle α of the bend (41) ranges from 5° to 45°. When the bend (41) of the first sealing lip (4) contacts the mating shaft, the bend (41) is compressed and deformed, so that only a part of the bend (41) forms a line contact or a narrow band contact with the mating shaft.

2. The novel low-friction torque sealing ring according to claim 1, characterized in that: The rubber body (2) forms a radial protrusion (3) on the outside of the mounting end of the metal ring skeleton (1) for the sealing ring to form a static seal by interference contact with the bearing mating surface.

3. The novel low-friction torque sealing ring according to claim 1, characterized in that: In the installed state, lubricating oil is filled between the first sealing lip (4) and the mating shaft, between the second sealing lip (5) and the mating shaft, and between the third sealing lip (6) and the mating shaft.

4. The novel low-friction torque sealing ring according to claim 1, characterized in that: The first sealing lip (4), the second sealing lip (5), and the third sealing lip (6) are respectively interference-fitted with the flange.

5. A novel low-friction torque sealing ring according to claim 1, characterized in that: The metal ring frame (1) is made of SPCC, SUS430 or SUS304.

Images