Framework type multi-layer lip sealing element for shaft connecting bearing

Abstract

The utility model discloses a skeleton type multi-layer lip sealing element for a shaft connecting bearing, which comprises a metal skeleton with an annular structure and a rubber sealing ring coated on the metal skeleton, and the outer ring of the rubber sealing ring is provided with an outer diameter lip embedded in a sealing fixing groove in a sealing way; the inner ring is sequentially provided with a first inner diameter lip, a second inner diameter lip and a third inner diameter lip from the sealing interior to the sealing exterior, the first inner diameter lip is in clearance fit with the rotating mandrel, the second inner diameter lip is in transition fit with the rotating mandrel, and the third inner diameter lip is in interference fit with the rotating mandrel. Rotary sealing is achieved through the multiple layers of lips, the metal framework is additionally arranged, the overall rigidity of the sealing piece is improved, meanwhile, the sealing performance is more excellent, and the service life is longer.

Description

Technical Field

[0001] The utility model relates to the technical field of seals, in particular to a skeleton type multi-layer lip seal for a shaft-connected bearing. Background Art

[0002] A shaft-connected bearing is a double-bearing with a simplified structure. The two supporting bearings have no inner raceway, and the raceways of the rolling elements are directly made on the shaft. The outer raceways of the two supporting bearings are made into a whole, and the two sides of the raceway are sealed with seals to form a combined component of the shaft sleeve. The sealing of shaft-connected bearings has always been one of the important factors related to the service life of bearings. The seal generally includes sealing lips that are in sealing contact with the rotating core shaft of the inner ring and the installation fixing groove of the outer ring respectively. Among them, the sealing lip of the outer ring forms a static seal with the installation fixing groove, and the sealing lip of the inner ring forms a dynamic seal with the rotating core shaft. After long-term operation, the seal is prone to deformation, and the sealing lip of the inner ring has only a single layer. Due to long-term wear and failure, external pollutants enter the bearing interior, or the lubricating oil inside the bearing overflows, accelerating the early failure of the shaft-connected bearing. Therefore, it is necessary to optimize the structure of the existing shaft-connected bearing seal. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a skeleton type multi-layer lip seal for a shaft-connected bearing aiming at the deficiencies of the prior art, which improves the overall rigidity of the seal, has more excellent sealing performance, and a longer service life.

[0004] The technical solution for achieving the purpose of the utility model is as follows:

[0005] A skeleton type multi-layer lip seal for a shaft-connected bearing includes a metal skeleton with an annular structure and a rubber sealing ring coated on the metal skeleton. The outer ring of the rubber sealing ring is provided with an outer diameter lip that is hermetically installed in a sealing fixing groove. The inner ring is sequentially provided with a first inner diameter lip, a second inner diameter lip, and a third inner diameter lip from the inside to the outside of the seal. The first inner diameter lip has a clearance fit with the rotating core shaft, the second inner diameter lip has a transition fit with the rotating core shaft, and the third inner diameter lip has an interference fit with the rotating core shaft.

[0006] Further, the first inner diameter lip is inclined towards the inside of the seal.

[0007] Further, the second inner diameter lip is arranged vertically downward and forms a first V-shaped groove with the first inner diameter lip.

[0008] Further, the bottom of the second inner diameter lip is provided with an inclined surface facing the outside of the seal.

[0009] Furthermore, the cross-section of the metal skeleton includes a first extension section, a second extension section, a third extension section, and a fourth extension section that are sequentially connected. The first extension section and the third extension section are parallel and perpendicular to the second extension section, and the fourth extension section is inclined towards the inside of the seal.

[0010] Furthermore, the third inner diameter lip is inclined towards the outside of the seal and forms a second V-shaped groove with the fourth extension section.

[0011] Furthermore, on the surface where the third inner diameter lip contacts the rotating mandrel, a plurality of lubricating grooves are provided in parallel from the inside of the seal to the outside of the seal.

[0012] Furthermore, the top of the outer diameter lip is a plane, and chamfers are provided on both sides.

[0013] Adopting the above technical solutions, the utility model has the following beneficial effects:

[0014] (1) On the basis of the traditional seal, the utility model adds a metal skeleton, thereby improving the overall structural rigidity of the seal and avoiding deformation. A static seal is formed by the outer diameter lip and the fixedly arranged installation and fixing groove. The first inner diameter lip with an interference fit with the rotating mandrel blocks the vast majority of the lubricating oil inside the seal. Only a small amount of lubricating oil reaches the second inner diameter lip and provides lubrication for the second inner diameter lip with a transition fit with the rotating mandrel, thereby reducing the friction force of the multi-layer lips. Since the second inner diameter lip and the rotating mandrel are in a transition fit, a very small amount of lubricating oil will reach the third inner diameter lip, which can provide long-lasting lubrication for the third inner diameter lip and will not overflow to the outside of the seal. On the contrary, foreign matters outside the seal are blocked by the multi-layer lips, reducing the risk of entering the inside of the seal. The overall structure reduces the rotational friction while improving the rigidity and sealing effect, meeting higher usage requirements.

[0015] (2) The first inner diameter lip of the utility model is inclined towards the inside of the seal, which can better block the lubricating oil inside the seal.

[0016] (3) By providing the first V-shaped groove, the utility model can store the lubricating oil flowing through here and achieve a long-lasting lubrication effect.

[0017] (4) The bottom of the second inner diameter lip of the utility model is provided with an inclined surface, thereby reducing the contact area with the rotating mandrel, reducing the friction force, achieving better rotational performance, and the inclined surface is arranged towards the outside of the seal, which can not only guide a very small amount of lubricating oil to flow towards the third inner diameter lip, but also better isolate the substances outside from flowing into the inside.

[0018] (5) The metal skeleton of the utility model forms two bending points through multiple extension sections, thereby ensuring the overall rigidity.

[0019] (6) By providing a second V-shaped groove, the present utility model provides sufficient elastic space for the third inner diameter lip on the outer side, which can effectively reduce the problem of excessive initial rotational torque caused by a large interference amount of the third inner diameter lip, and reduce the wear amount of the third inner diameter lip, and maintain the resilience after wear of the third inner diameter lip after long-term operation, so as to keep the third inner diameter lip in close contact with the shaft surface all the time.

[0020] (7) By providing lubricating grooves, the present utility model not only provides long-term lubrication, but also realizes that when a small amount of internal or external sealed substances invade between the contact surfaces of the third inner diameter lip and the shaft surface, the substances will be retained in the lubricating grooves to form a new sealing surface to block subsequent invasions.

[0021] (8) The top of the outer diameter lip of the present utility model is a plane, so as to increase the contact area and achieve better sealing performance. Chamfers are provided on both sides, which is more convenient for installation in the installation fixing groove. Description of the Drawings

[0022] In order to make the content of the present utility model easier to be clearly understood, the following further details the present utility model according to specific embodiments and in conjunction with the drawings, where:

[0023] Figure 1 It is a schematic structural diagram of the welding torch device of the present utility model.

[0024] The reference numerals in the drawings are:

[0025] Metal skeleton 1, first extension section 1-1, second extension section 1-2, third extension section 1-3, fourth extension section 1-4, rubber sealing ring 2, outer diameter lip 2-1, first inner diameter lip 2-2, second inner diameter lip 2-3, third inner diameter lip 2-4, lubricating groove 2-4-1;

[0026] Rotating mandrel 100. Detailed Embodiment

[0027] In order to better understand the above technical solutions, the following will detail the above technical solutions in conjunction with the drawings of the specification and specific embodiments.

[0028] (Embodiment 1)

[0029] As Figure 1The shown multi-layer lip seal for shaft-connected bearings is installed on the rotating mandrel 100, and includes a metal skeleton 1 with an annular structure and a rubber sealing ring 2 coated on the metal skeleton. By adding a metal skeleton on the basis of the traditional seal, the overall structural rigidity of the seal is improved, and deformation is avoided. The outer ring of the rubber sealing ring 2 is provided with an outer diameter lip 2-1 that is hermetically installed in the sealing fixing groove, forming a static seal with the installation fixing groove. The inner ring is sequentially provided with a first inner diameter lip 2-2, a second inner diameter lip 2-3, and a third inner diameter lip 2-4 from the inner part to the outer part of the seal, forming a multi-layer dynamic seal. Among them, the first inner diameter lip 2-2 is in clearance fit with the rotating mandrel, the second inner diameter lip 2-3 is in transition fit with the rotating mandrel, and the third inner diameter lip 2-4 is in interference fit with the rotating mandrel. Most of the lubricating oil inside the seal is blocked by the first inner diameter lip 2-2, and only a small amount of lubricating oil reaches the second inner diameter lip 2-3, providing lubrication for the second inner diameter lip 2-3, thereby reducing the friction force of the multi-layer lips. Since the second inner diameter lip 2-3 is in transition fit with the rotating mandrel, a very small amount of lubricating oil will reach the third inner diameter lip 2-4, which can provide persistent lubrication for the third inner diameter lip 2-4 without overflowing to the outside of the seal. On the contrary, foreign objects outside the seal are blocked by the multi-layer lips, reducing the risk of entering the inside of the seal. The overall structure reduces the rotational friction while improving the rigidity and sealing effect, meeting higher usage requirements.

[0030] Specifically, the cross-section of the metal skeleton 1 includes a first extension section 1-1, a second extension section 1-2, a third extension section 1-3, and a fourth extension section 1-4 that are sequentially connected. Among them, the first extension section 1-1 and the third extension section 1-4 are parallel and perpendicular to the second extension section 1-2, and the fourth extension section 1-4 is inclined towards the inside of the seal, thereby forming two bending points to ensure the overall rigidity.

[0031] The top of the outer diameter lip 2-1 is a plane, thereby increasing the contact area and achieving better sealing performance. Chamfers are provided on both sides of the outer diameter lip 2-1, making it more convenient to be installed in the installation fixing groove.

[0032] The first inner diameter lip 2-2 is inclined towards the sealed interior, which can better block the lubricating oil inside the seal. The second inner diameter lip 2-3 is vertically downward and forms a first V-shaped groove with the first inner diameter lip 2-2. The lubricating oil flowing through here is stored through the first V-shaped groove to achieve a long-term lubricating effect. The bottom of the second inner diameter lip 2-3 is provided with an inclined surface facing the outside of the seal, thereby reducing the contact area with the rotating mandrel, reducing the friction force, achieving better rotational performance, and the inclined surface facing the outside of the seal can not only guide a very small amount of lubricating oil to the third inner diameter lip 2-4, but also better isolate the substances on the outside from flowing into the inside. The third inner diameter lip 2-4 is inclined towards the outside of the seal and forms a second V-shaped groove with the fourth extension section 1-4 and a third V-shaped groove with the second inner diameter lip 2-3. The function of the third V-shaped groove is the same as that of the first V-shaped groove. Through the second V-shaped groove, sufficient elastic space is provided for the third inner diameter lip 2-4 on the outside, which can effectively reduce the problem of excessive initial rotational torque caused by the large interference amount of the third inner diameter lip 2-4, and reduce the wear amount of the third inner diameter lip, and maintain the resilience after the third inner diameter lip wears after long-term operation, so as to keep the third inner diameter lip always in close contact with the shaft surface. The surface of the third inner diameter lip 2-4 in contact with the rotating mandrel is provided with a plurality of lubricating grooves 2-4-1 parallel from the sealed interior to the sealed exterior. It not only provides long-term lubrication, but also when a small amount of substances inside or outside the seal invade between the contact surface of the third inner diameter lip and the shaft surface, the substances will be retained in the lubricating grooves to form a new sealing surface to block subsequent invasions.

[0033] In this embodiment, the first inner diameter lip 2-2 has a clearance fit with the shaft diameter of 0.05 - 0.15 mm, the second inner diameter lip 2-3 has an interference fit with the shaft diameter of ±0.05 mm, and the third inner diameter lip 2-4 has an interference fit with the shaft diameter of more than 0.3 mm. During operation, when the seal is installed, liquid lubricating oil is coated on the surfaces of all the inner diameter lips to provide initial lubrication for the lips and install the seal in the installation and fixing groove. The whole seal is in a static state relative to the installation and fixing groove, and the shaft surface rotates. During the rotation process, most of the grease inside the seal is blocked inside the seal by the inclined surface of the first inner diameter lip 2-2, and a small amount of grease enters the first V-shaped groove between the first inner diameter lip 2-2 and the second inner diameter lip 2-3 to provide continuous lubrication for the lips during long-term operation. Since the second inner diameter lip 2-3 has an interference fit with the shaft diameter, a very small amount of grease will enter the third V-shaped groove between the second inner diameter lip 2-3 and the third inner diameter lip 2-4 to provide long-term lubrication for the third inner diameter lip 2-4 during long-term operation. The outer diameter lip 1 has a large interference amount with the shaft diameter, which can effectively block the intercommunication of substances inside and outside the seal. And due to the existence of the lubrication groove 2-4-1, even if a small amount of substances inside or outside the seal invade the contact surface between the third inner diameter lip 2-4 and the shaft surface, the substances will be retained in the lubrication groove 2-4-1 to form a new sealing surface to block subsequent invasions. The second V-shaped groove provides sufficient elastic space for the third inner diameter lip 2-4, which can effectively reduce the problem of excessive initial rotation torque caused by the large interference amount of the outer diameter lip, and reduce the wear amount of the outer diameter lip, and maintain the resilience of the third inner diameter lip 2-4 after long-term operation and keep the third inner diameter lip 2-4 always closely attached to the shaft surface.

[0034] On the basis of the traditional seal, the utility model adds a metal skeleton to improve the overall structural rigidity of the seal and avoid deformation. A static seal is formed by the outer diameter lip and the fixedly arranged installation and fixing groove. The vast majority of the lubricating oil inside the seal is blocked by the first inner diameter lip with an interference fit with the rotating mandrel. Only a small part of the lubricating oil reaches the second inner diameter lip to provide lubrication for the second inner diameter lip with an interference fit with the rotating mandrel, thereby reducing the friction force of the multi-layer lips. Since the second inner diameter lip has an interference fit with the rotating mandrel, a very small amount of lubricating oil will reach the third inner diameter lip, which can not only provide persistent lubrication for the third inner diameter lip but also not overflow to the outside of the seal. On the contrary, foreign matters outside the seal are blocked by the multi-layer lips, reducing the risk of entering the inside of the seal. While improving the rigidity and sealing effect, the overall structure reduces the rotational friction force to meet higher usage requirements.

[0035] The specific embodiments described above further elaborate on the purpose, technical solution, and beneficial effects of the present utility model. It should be understood that the above are only specific embodiments of the present utility model and are not used to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A skeleton-type multi-layer lip seal for a shaft-connected bearing, characterized in that: It comprises a metal frame with an annular structure and a rubber sealing ring coated on the metal frame, wherein the outer ring of the rubber sealing ring is provided with an outer diameter lip which is sealed and embedded in a sealing fixing groove, and the inner ring is provided with a first inner diameter lip, a second inner diameter lip and a third inner diameter lip in sequence from the inside of the seal to the outside of the seal, wherein the first inner diameter lip is clearance-fitted with a rotating core shaft, the second inner diameter lip is transitionally fitted with the rotating core shaft, and the third inner diameter lip is interference-fitted with the rotating core shaft.

2. A skeleton-type multi-layer lip seal for a shaft-connected bearing according to claim 1, characterized in that: The first inner diameter lip is inclined toward the seal interior.

3. A skeleton-type multi-layer lip seal for a shaft-connected bearing according to claim 2, characterized in that: The second inner diameter lip is vertically arranged downward and forms a first V-shaped groove with the first inner diameter lip.

4. A skeleton-type multi-layer lip seal for a shaft-connected bearing according to claim 3, characterized in that: The bottom of the second inner diameter lip is provided with an inclined surface arranged toward the outside of the seal.

5. The skeleton-type multi-layer lip seal for a shaft-connected bearing according to claim 1, characterized in that: The cross section of the metal skeleton includes a first extension section, a second extension section, a third extension section and a fourth extension section which are sequentially connected. The first extension section and the third extension section are parallel and perpendicular to the second extension section. The fourth extension section is inclined toward the inside of the seal.

6. A skeleton-type multi-layer lip seal for a shaft-connected bearing according to claim 5, characterized in that: The third inner diameter lip is inclined toward the outside of the seal and forms a second V-shaped groove with the fourth extension section.

7. The skeleton-type multi-layer lip seal for a shaft-connected bearing according to claim 1, characterized in that: The surface where the third inner diameter lip contacts the rotating core shaft is provided with a plurality of lubrication grooves in parallel from the inside of the seal to the outside of the seal.

8. The skeleton-type multi-layer lip seal for a shaft-connected bearing according to claim 1, characterized in that: The top of the outer diameter lip is a plane, and chamfers are arranged on both sides.

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