Pressure relief type sealing ring and bearing adopting sealing ring

Abstract

The utility model relates to a pressure relief type sealing ring and a bearing adopting the same, the pressure relief type sealing ring is arranged between a first sealing groove of a bearing outer ring and a second sealing groove of a bearing inner ring, and comprises an annular sealing main body and a framework arranged on the sealing main body, an outer lip matched with the first sealing groove is arranged on the radial outer edge of the sealing body, an inner lip matched with the second sealing groove is arranged on the radial inner edge of the sealing body, the inner lip comprises a contact lip in abutting connection with the second sealing groove, and a protruding point is arranged on the contact end face of the contact lip and the second sealing groove. And a gap is formed between the contact lip around the convex point and the second sealing groove through the convex point. Through the arrangement of the salient points, air pressure can be released through the gaps during injection molding, the salient points are worn and disappear during working, and the original sealing effect of the sealing ring is kept. The pressure relief valve not only can relieve pressure, but also keeps the sealing effect.

Description

Technical Field

[0001] The utility model relates to a sealing ring for a bearing and a bearing adopting the sealing ring. Background Art

[0002] Sealing rings on both sides of a bearing prevent external dust, moisture, and harmful gases from entering the bearing interior. They also prevent lubricant leakage and reduce environmental pollution. The sealing effectiveness of the sealing ring directly affects the quality of the bearing. However, in some scenarios, such as when the bearing exterior is injection molded, the high temperatures generated during the injection molding process can cause the gas inside the bearing to expand. Although the sealing ring has a good sealing effect, if the pressure reaches a certain level, it may actually push the seal out. Summary of the Invention

[0003] In order to overcome the above-mentioned deficiencies in the prior art, the utility model provides a pressure relief seal ring which can relieve the pressure of gas and still maintain a sealing effect.

[0004] The utility model is realized by the following technical solutions:

[0005] A pressure relief seal ring is sealed between a first sealing groove of a bearing outer ring and a second sealing groove of a bearing inner ring, and comprises an annular sealing body and a skeleton arranged on the sealing body. The radial outer edge of the sealing body is provided with an outer lip that matches the first sealing groove, and the radial inner edge of the sealing body is provided with an inner lip that matches the second sealing groove. The inner lip comprises a contact lip that is in contact with the second sealing groove, and is characterized in that a convex point is provided on the contact end surface of the contact lip and the second sealing groove, and the convex point forms a gap between the contact lip around the convex point and the second sealing groove.

[0006] Preferably, the diameter of the protrusion is between 0.1 mm and 0.3 mm, and when the bearing is working, the protrusion is worn away so that the contact lip is sealed and connected to the second sealing groove.

[0007] Preferably, the inner lip further comprises a grease retaining lip arranged radially outward of the contact lip, the outer surface of the grease retaining lip being inclined along the sealing body, and the radial inner end of the skeleton extending into the outer surface of the grease retaining lip.

[0008] Preferably, a dust lip is further provided on the opposite outer side of the contact lip, and an elastic groove is formed between the dust lip and the sealing body.

[0009] A bearing comprises a bearing outer ring, a bearing inner ring, a retaining frame arranged between the bearing outer ring and the bearing inner ring, and balls arranged in the retaining frame. A first sealing groove and a second sealing groove are respectively provided on both sides of the inner side of the bearing outer ring and on both sides of the outer side of the bearing inner ring. A sealing ring is respectively provided between the first sealing groove and the second sealing groove, wherein at least one of the sealing rings adopts the above-mentioned pressure relief sealing ring.

[0010] The utility model provides a raised point at the sealing position between the sealing ring and the bearing inner ring, creating a gap between the sealing ring and the bearing inner ring. During the injection molding of the bearing, the air pressure generated by the high temperature is released through this gap, preventing the sealing ring from being pushed out. During operation of the bearing, the raised point is small and is quickly worn away, thus maintaining the original sealing effect of the sealing ring.

[0011] The beneficial effects of the present invention are as follows: The present invention can release air pressure through the gap during injection molding by setting the convex points. During operation, the convex points are worn away, thereby maintaining the original sealing effect of the sealing ring. The present invention can both release pressure and maintain the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural diagram of the sealing ring of the utility model.

[0013] Figure 2 It is a schematic diagram of the installation structure of the sealing ring.

[0014] Figure 3 This is a schematic diagram of the structure after the bearing is running DETAILED DESCRIPTION

[0015] The utility model is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0016] like Figure 1 As shown, a pressure relief seal ring is provided between the first sealing groove of the bearing outer ring and the second sealing groove of the bearing inner ring. It includes an annular sealing body 1 and a skeleton 3 provided on the sealing body. The radial outer edge of the sealing body is provided with an outer lip 2 that matches the first sealing groove, and the radial inner edge of the sealing body is provided with an inner lip that matches the second sealing groove. The inner lip includes a contact lip 6 that is in contact with the second sealing groove. A protrusion 5 is provided on the contact end surface of the contact lip and the second sealing groove. The protrusion 5 forms a gap between the contact lip around the protrusion and the second sealing groove. The diameter of the protrusion is between 0.1mm and 0.3mm. When the bearing is working, the protrusion is worn away, so that the contact lip is sealed with the second sealing groove. The size of the protrusion should be such that it can be worn away immediately after the bearing is working to ensure the subsequent sealing effect.

[0017] The inner lip also includes a grease retaining lip 4 radially outward from the contact lip. The outer surface of the grease retaining lip 4 is inclined along the seal body, and the radially inner end 7 of the frame extends into the outer surface of the grease retaining lip. The outer surface of the grease retaining lip guides the grease back into the ball groove.

[0018] A dust lip 9 is located on the opposite side of the contact lip, with an elastic groove 8 formed between the dust lip and the seal body. This lip prevents the ingress of dust and impurities, thus protecting the contact lip from wear. The elastic groove 8 also controls the starting and rotational torque of the seal ring.

[0019] like Figure 2 、 3 As shown, a bearing includes a bearing outer ring 10, a bearing inner ring 11, a retaining frame arranged between the bearing outer ring and the bearing inner ring, and balls arranged in the retaining frame. A first sealing groove 12 and a second sealing groove 13 are respectively provided on both sides of the inner side of the bearing outer ring and the outer side of the bearing inner ring. A sealing ring is respectively provided between the first sealing groove and the second sealing groove, wherein at least one of the sealing rings adopts the pressure relief sealing ring as mentioned above.

[0020] A raised point 5 is provided at the sealing point between the sealing ring and the bearing inner ring, creating a gap between them. During injection molding, the air pressure generated by the high temperature is released through this gap, preventing the sealing ring from bursting out. During operation, the raised point is relatively small and quickly wears away, preserving the sealing ring's original sealing effect. This seal on one side of the bearing achieves a pressure relief effect.

[0021] The utility model is provided with convex points, so that during injection molding, air pressure can be released through the gap. During operation, the convex points are worn away, thereby maintaining the original sealing effect of the sealing ring. The utility model can both release pressure and maintain the sealing effect.

Claims

1. A pressure relief seal ring, disposed between a first sealing groove of a bearing outer ring and a second sealing groove of a bearing inner ring, comprising an annular sealing body and a frame disposed on the sealing body, wherein the radial outer edge of the sealing body is provided with an outer lip that engages with the first sealing groove, and the radial inner edge of the sealing body is provided with an inner lip that engages with the second sealing groove, wherein the inner lip includes a contact lip that abuts against the second sealing groove, and wherein: A convex point is provided on the contact end surface of the contact lip and the second sealing groove, and a gap is formed between the contact lip around the convex point and the second sealing groove.

2. A pressure relief seal ring according to claim 1, characterized in that: The diameter of the protrusion is between 0.1 mm and 0.3 mm. When the bearing is working, the protrusion is worn away so that the contact lip is sealed and connected with the second sealing groove.

3. The pressure relief seal ring according to claim 2, characterized in that: The inner lip further comprises a grease retaining lip arranged radially outward of the contact lip, the outer side surface of the grease retaining lip being inclined along the sealing body, and the radial inner end portion of the skeleton extending into the outer side surface of the grease retaining lip.

4. The pressure relief seal ring according to claim 2, characterized in that: A dustproof lip is further provided on the opposite outer side of the contact lip, and an elastic groove is formed between the dustproof lip and the sealing body.

5. A bearing comprising an outer ring, an inner ring, a retainer disposed between the outer ring and the inner ring, and balls disposed within the retainer, wherein a first sealing groove and a second sealing groove are respectively disposed on both inner sides of the outer ring and on both outer sides of the inner ring, and a sealing ring is respectively disposed between the first sealing groove and the second sealing groove, characterized in that: At least one side of the sealing ring adopts a pressure relief sealing ring as described in any one of claims 1 to 4 above.

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