WO2017118278A1

WO2017118278A1 - Dust-prevention seal assembly for preventing fluid from leaking from seal groove opening of outer ring, and bearing

Info

Publication number: WO2017118278A1
Application number: PCT/CN2016/111105
Authority: WO
Inventors: 赵联春; 赵思澄; 晏丽明; 陈淑英
Original assignee: 上海斐赛轴承科技有限公司
Priority date: 2016-01-06
Filing date: 2016-12-20
Publication date: 2017-07-13

Abstract

A dust-prevention seal assembly (66, 86, 106, 126,146) for preventing fluid from leaking from a seal groove opening of an outer ring, and a bearing. A typical structure of the dust-prevention seal assembly (66, 86, 106, 126,146) is that an oil-resistant elastic material is adhered and hung onto at least one of the bottom surface, the top surface and the front surface of a hemming part of an existing dust-prevention cover. After the dust-prevention seal assembly (66, 86, 106, 126,146) is punched into a seal groove of an outer ring (61, 81, 101, 121, 141) of a bearing, the dust-prevention seal assembly (66, 86, 106, 126,146) and the seal groove form elastic interference contact due to existence of the elastic material, so that a fluid lubricant (65, 85, 105，125, 145) in the bearing can be prevented from leaking from the seal groove opening of the outer ring, and the fluid around the bearing can be prevented from invading into an inner chamber of the bearing from the seal groove opening of the outer ring. Accordingly, dust-prevention seal performance of the bearing is greatly improved, so that the operation reliability and the operation life of the bearing are obviously enhanced, and the effect is more obvious for an outer-ring swivel bearing and a bearing at a high acceleration/deceleration working condition, thereby bringing practical engineering significance.

Description

Dust seal assembly and bearing to prevent fluid from leaking from the outer ring seal groove

Technical field

The invention relates to the technical field of special dustproof sealing assemblies and special rolling bearings, in particular to a dustproof sealing assembly and a bearing for preventing leakage of fluid from an outer ring sealing groove.

Background technique

If the bearing is improperly sealed, the lubricant leaks a lot, the bearing works in lean or oil-free lubrication, and the bearing will quickly fail. If the bearing is improperly dust-proof, external foreign matter enters the bearing cavity and pollutes the bearing lubricant, which will be greatly reduced. The lubrication life of the bearing significantly reduces the fatigue life of the bearing. Therefore, dust and sealing have a decisive influence on the operational reliability and operating life of the rolling bearing.

In the dust-proof sealing of bearings, theoretical researchers and engineers in the related fields have made a lot of efforts. By designing the labyrinth structure, multi-lip seal, contact type and even heavy contact sealing, it is basically possible to prevent the lubricant from being dust-proof. The seal and the seal of the inner ring of the bearing leak. However, as the main engine develops toward higher speed and limit, in the actual engineering, it is found that there are more and more cases of grease leaking from the sealing groove of the outer ring of the bearing, especially in the outer ring rotating bearing and high acceleration/deceleration environment. Bearings are so strong that the bearings that work under such severe conditions have a greater centrifugal force than the normal operating conditions and therefore accumulate in the outer ring sealing slots, and the risk of lubricant leaking from the outer ring sealing slots is sharp Raise. The current technical metal dust cover and skeleton rubber seal can not significantly reduce or even completely avoid the risk of leakage of lubricant from the outer lip, which has been confirmed by engineering practice, and the reason is not difficult to understand. The metal dust cover relies on the elastic deformation of the beading portion of the outer edge during punching and the outer ring sealing groove to achieve the contact fit, but this is the contact fit between the metal material and the metal material, and the dust cover material is far more than the bearing outer ring. The material is soft, the interference fit is not large, and the interference contact area is relatively small. Moreover, in order to make the punching rive easy and does not cause abnormal deformation of the portion other than the bead at the dust cover, the groove is separated in the circumference of the bead. All of these are hidden dangers for the lubricant to leak from the outer ring sealing groove; the skeleton rubber sealing ring relies on the elastic deformation of the outer lip rubber and the outer ring sealing groove to achieve the interference fit, but due to the elasticity of the rubber Very large, flexible, and also makes the leakage of lubricant from the outer ring sealing groove; for the metal ring of the micro-small bearing and the metal two-piece combination seal assembly, the lubricant also exists from the outer ring The hidden danger of leaking the sealing groove is similar to the metal dust cover.

Due to the fluid, especially the lubricating oil and grease with a certain viscosity, the climbing effect on the metal surface is very strong. For the reasons of the above analysis, under the special conditions of the bearing outer ring rotation, high acceleration/deceleration, etc., the current dust seal assembly Metal dust cover, skeleton rubber seal ring, metal retaining ring and metal collar assembly are difficult to block the leakage from the outer ring sealing groove of the bearing, which has been proved by engineering practice. real. The leaking lubricant not only pollutes the main machine and the work-in-progress, but also greatly reduces the operational reliability of the bearing, and shortens the service life of the bearing several times and several times. Therefore, the invention of a dust seal assembly and a bearing capable of preventing fluid from leaking from the seal groove of the outer ring of the bearing has very important engineering practical significance.

Figure 1 is a typical bearing outer ring seal groove shape, composed of three faces, the bottom face, the top face and the front face (also known as the slope face). The current technology dust cover, skeleton rubber seal ring, and the collar are passed through The elastic contact of the face is fixed with the outer ring, and forms a non-contact or contact seal pair with the sealing groove on the inner ring of the bearing or the inner ring, so that the whole bearing has a certain dustproof sealing effect. However, since there is no elastic material at the outer edge (such as dust cover, collar, etc.) or elastic material, it is very soft, and no external force forces it to press on the three faces of the sealing groove. Therefore, there is no outer ring. The sealing groove forms an effective elastic interference contact.

2A is a dust cover of the prior art, which can be roughly divided into an outer edge, an inner edge and a middle portion between the two, and the outer edge can be subdivided into a bottom surface, a top surface and a front surface, respectively corresponding to the outer ring dustproof. The bottom surface, the top surface and the front surface of the groove are punched into the bearing outer ring sealing groove to form a sealed bearing with a dust cover as shown in FIG. 2B. The bearing is composed of the outer ring 21, the inner ring 22 and the rolling body 23 The retainer 24, the lubricant 25, and the dust cover 26 are formed. It can be seen that the bottom surface, the top surface and the front surface of the outer edge of the dust cover are respectively in contact with the bottom surface, the top surface and the front surface of the seal groove of the outer ring of the bearing. Thereby, the dustproof cover 26 is fixed to the bearing outer ring 21. Since the dust cover 26 and the bearing outer ring 21 are generally made of a metal material, their contact areas on the bottom surface, the top surface and the front surface of the sealing groove are not large, the contact is not very solid, and the contact is not elastic. Interference, coupled with the existence of manufacturing errors, in the case of overall contact in the circumferential direction, there is a possibility of a gap in the local, and during the rotation of the bearing, due to the centrifugal force and thermal expansion and contraction effect, the non-working state These parts of contact are also likely to come out of contact under working conditions, forming a gap. Due to the fluid lubricant, such as grease, injected into the inner cavity of the bearing, the base oil is viscous and the creeping property is strong. Continuous leakage in small gaps seriously jeopardizes the operational reliability of the bearings, operating life, performance of work-in-progress and mainframes. For some mainframes such as elevators, such leakage may also jeopardize operational and personal safety.

3A is a prior art skeleton type rubber sealing ring, and FIG. 3B is a bearing for mounting the sealing ring. The rubber of the skeleton rubber sealing ring head is mounted on the bearing outer ring by contact with the bottom surface, the top surface and the front surface of the outer ring sealing groove. Above, this contact is a resilient interference contact because the rubber is an elastomer, but since the metal skeleton of the seal does not extend to the head (because it extends to the head, the entire seal cannot enter the seal groove from the groove of the seal groove) Inside, so, the contact force between the head of the seal ring and the elastic interference contact formed by the seal groove is not large. During the operation, the elastic interference contact will change due to the centrifugal force and the thermal expansion and contraction factors. Elastic interference with little contact force, even into a small gap, fluid The slip agent will enter the gap and leak out.

4A shows a collar and a retaining ring combination seal used in the prior art micro-small bearing, and FIG. 4B shows a micro-small bearing with the combined seal. In order to prevent the force of the stamping dust cover and the skeleton rubber sealing ring from causing deformation and precision change of the outer ring of the micro-small bearing, the combination sealing is adopted. It is not difficult to imagine that, like the bearing with dust cover in Figure 2B, due to the lack of elastic interference contact between the combined seal and the outer ring dust groove, the fluid lubricant in the bearing cavity leaks from the outer ring seal groove. Under special working conditions, it becomes inevitable.

Accordingly, there is provided a dust seal assembly and a bearing that prevent fluid from leaking from the outer ring seal groove, so that the fluid lubricant sealed inside the bearing under any severe working conditions does not leak from the outer ring seal groove It is very urgent and necessary that the fluid medium around the bearing does not penetrate into the bearing cavity from the outer ring sealing groove.

Summary of the invention

A first object of the present invention is to provide a dustproof seal assembly for preventing fluid from leaking from a bearing groove of a bearing outer ring, so as to solve the problem that the current metal dust cover, the skeleton type rubber seal ring and the like can not prevent the lubricant from being discharged. Technical problem of leakage of bearing outer ring seal groove.

A second object of the present invention is to provide a rolling bearing for preventing leakage of fluid from a bearing groove of a bearing outer ring, so as to solve the leakage of the lubricant from the outer ring seal groove of the current rolling bearing under certain working conditions and the resulting Leakage lubricants contaminate technical quality problems and safety issues that are several times, dozens of times lower in product and mainframe, bearing operational reliability and operating life.

The invention relates to a dustproof sealing assembly for preventing fluid from leaking from a sealing groove of a bearing outer ring, characterized in that: the dustproof sealing assembly is a single composite structure composed of an elastic material bonded to the outer edge of the metal dustproof cover. Or a combination of two or more parts axially concentrically combined, one of which is entirely made of an elastic material or the part is made of a metal material but bonded to the outer edge of the elastic material, inside Arranged, the other part is a collar, placed outside, and the remaining parts are centered.

The dustproof sealing assembly is characterized in that: the dustproof sealing assembly of the single composite structure, the metal dustproof cover comprises a pure metal dust cover with an inner edge of an "L" type crimping and an inner edge without The metal crimping is a metal dustproof cover with a rubber sealing lip that bonds the rubber sealing lip by a vulcanization process, and the elastic material bonded to the outer edge of the metal dustproof cover is preferably an oil-resistant rubber and bonded by a vulcanization process.

The dust seal assembly is characterized in that: the dust seal assembly of the combined structure comprises two parts of a flat washer and a metal dust cover made of an elastic material, and the flat washer has an inner dust cover and an outer shaft. Arranged concentrically, preferably, the selected elastic material is an oil resistant rubber.

The dust seal assembly is characterized in that: the dust seal assembly of the combined structure comprises two parts of a metal ring and a metal ring which is bonded with an elastic material at the outer edge, and the retaining ring is outside the inner ring. The axially concentric arrangement, preferably, the selected elastomeric material is an oil resistant rubber bonded by a vulcanization process.

The dust seal assembly is characterized in that: the dust seal assembly of the combined structure comprises three parts of a snap ring, a metal retaining ring and a flat washer made of an elastic material, and the flat washer is centered and the retaining ring is centered. The collar is arranged concentrically in the outer axial direction. Preferably, the selected elastic material is oil resistant rubber.

The dust seal assembly is characterized in that: the outer edge is bonded with a metal dust cover of an elastic material, and the elastic material is bonded on one to all surfaces of the dust cover and the outer ring seal groove of the bearing, The bond strength is increased and the bond site can be extended to a curved surface where the dust cap does not contact the seal groove.

The dust seal assembly is characterized in that: the outer edge is bonded with a metal retaining ring of an elastic material, and the elastic material is bonded to one to all surfaces of the outer edge of the retaining ring and the bearing outer ring sealing groove and the collar. In order to improve the bonding strength, the bonding portion may extend to the top of the retaining ring which is not in contact with the sealing groove and the collar. There are three contact surfaces, front, top and bottom. Thus, one to all surfaces, also referred to as partial or total surfaces, refers to any of the three, and may also refer to any two of the three.

A rolling bearing for preventing fluid from leaking from an outer ring sealing groove, comprising a bearing outer ring, an inner ring, a rolling element, a retainer, a fluid lubricant and a dust seal assembly, wherein the dust seal assembly is as described A dust seal assembly that prevents fluid from leaking from the outer ring seal slot, the dust seal assembly being mounted on the bearing outer ring by radial or/and axial interference contact with the outer ring seal slot.

The rolling bearing is characterized in that the dustproof sealing assembly mounted thereon is the single composite structure, and the dustproof cover is fixed in the outer ring sealing groove by elastic deformation of the outer edge curling, and the outer edge of the dustproof cover is adhered. The elastic material of the knot is sandwiched between the contact surface of the dust cover and the sealing groove to form a resilient interference contact.

The rolling bearing is characterized in that the dustproof sealing assembly mounted thereon is the combined structure, the flat washer made of elastic material is inside, the metal dust cover is outside, and the dust cover is curled by the outer edge. The elastic deformation is fixed in the outer ring sealing groove, and the elastic material flat washer is interposed between the dust cover and the sealing surface of the sealing groove to form a elastic interference contact.

The rolling bearing is characterized in that the combined structure of the dustproof sealing assembly mounted thereon has a metal retaining ring which is bonded with an elastic material at the outer edge, and the outer side of the retaining ring is elastically deformed by the collar. It is fixed in the outer ring sealing groove, and the elastic material is interposed between the retaining ring and the sealing groove, the matching surface of the ring and the collar, forming a elastic interference contact.

The rolling bearing is characterized in that the dustproof sealing assembly mounted thereon is the combined structure, the flat washer made of elastic material is located inside, the collar is outside, the retaining ring is centered, and the three are elastic by the collar. The deformation is fixed in the outer ring sealing groove, and the elastic material is interposed between the retaining ring and the sealing surface of the sealing groove to form a elastic interference contact.

The monomer composite dustproof seal assembly for preventing fluid leakage from the outer ring seal groove is bonded to the outer edge of the current metal dust cover. The elastic material is preferably resistant to oil rubber, such as nitrile rubber, polyacrylate rubber, fluorine. For rubber or the like, the bonding method is preferably vulcanization. Because the rubber is vulcanized on the outer edge of the dust cover, the selected metal dust cover is the same as the current metal dust cover in terms of material and structure, but the size of the outer edge is corresponding to the vulcanized adhesive rubber. Adjustment, for example, in the case where the size of the outer ring seal groove is constant, the size of the metal dust cover before hanging the glue is slightly smaller than the current metal dust cover, and the space thickness of the elastic material after being pressed and deformed is left, To ensure that the vulcanization process is simple and efficient, and the dust seal assembly is pressed into the bearing outer ring seal groove by stamping, the rubber is clamped between the top surface of the outer edge of the dust cover and the top surface of the seal groove, and the bottom surface of the outer edge of the dust cover and A resilient interference contact is formed between the bottom surface of the sealing groove, the front edge of the dust cover outer edge and the sealing groove slope surface, thereby preventing the lubricant in the bearing from leaking from the bearing outer ring sealing groove to the outside of the bearing and preventing the bearing outer fluid And the effect of fine dust entering the bearing cavity from the bearing outer ring sealing groove, thereby producing a rolling bearing that prevents fluid from leaking from the bearing outer ring sealing groove.

The dustproof sealing assembly of the combined structure for preventing fluid from leaking from the outer ring sealing groove comprises two parts of an axially concentrically arranged metal dust cover and a rubber washer, and the rubber gasket is first laid on the bottom surface of the bearing outer ring sealing groove, Then, a metal dust cover is placed, and after the metal dust cover is molded into the sealing groove, the rubber gasket is pressed and pressed between the dust cover and the sealing groove to form a elastic interference contact, thereby preventing the lubricant in the bearing from being blocked. The bearing outer ring sealing groove leaks to the outside of the bearing and prevents the external fluid and fine dust from entering the bearing inner cavity from the bearing outer ring sealing groove, thereby preparing a rolling bearing for preventing fluid from leaking from the outer ring sealing groove.

The dustproof sealing assembly of the combined structure for preventing fluid from leaking from the outer ring sealing groove, the micro-small bearing, in order to avoid the deterioration of the precision of the bearing outer ring and the whole bearing bearing caused by the punching of the dust cover, the current technology often does not use the crimping The dust cover is a metal retaining ring, and the metal retaining ring is locked into the bearing outer ring sealing groove by a metal retaining ring. The metal collar and the metal retaining ring seal assembly do not form a resilient interference contact with the bearing outer ring seal groove, and the fluid cannot be completely prevented from flowing out of the bearing outer ring seal groove. leakage. The dustproof sealing assembly of the invention is also composed of a metal retaining ring and a retaining ring, but the outer edge of the metal retaining ring is vulcanized and bonded to the rubber, so that the metal retaining ring of the outer edge of the metal retaining ring is locked outside the bearing. After the ring is sealed in the groove, the rubber is pressed and pressed between the metal retaining ring and the sealing groove and between the metal retaining ring and the metal collar to form a resilient interference contact, which prevents the lubricant in the bearing from being sealed from the bearing outer ring. The notch leaks outside the bearing and prevents the external fluid and fine dust from entering the bearing cavity from the bearing outer ring sealing groove, thereby producing a rolling bearing that prevents fluid from leaking from the outer ring sealing groove.

In the dustproof sealing assembly of the present invention, the elastic body needs to be bonded to the portion in contact with the outer ring seal groove, so that the dust seal assembly can be installed between the dust seal assembly and the bearing seal groove after being mounted on the outer ring of the bearing. Forming an elastic interference contact to prevent fluid lubricant from leaking out of the outer ring sealing groove. Of course, in order to improve the bonding strength and the bonding process, the bonding can also be extended to the dust seal assembly and the outer ring. The part where the seal groove does not touch.

The dust seal assembly of the present invention focuses on preventing leakage of fluid from the outer ring seal groove, that is, focusing on the seal pair formed between the dust seal assembly and the outer ring, and therefore does not exclude and restrict to improve the dust seal. Various technical measures and means adopted for the dust-tight sealing ability of the sealing pair formed between the assembly and the inner ring. For example, the metal dust cover mentioned in the dust seal assembly of the present invention includes a pure metal dust cover with an "L" type crimp at the inner edge and an "L" type curl at the inner edge. The inner edge of the rubber sealing lip is attached with a metal dust cover.

It is also possible to manufacture a dust seal assembly that prevents fluid from leaking from the inner ring seal groove in accordance with the above-described technical principle of preventing the fluid from leaking from the outer ring seal groove. In this case, it is necessary to open the inner ring. To seal the sealing groove required for the dust seal assembly, it is necessary to make a dust seal assembly with an inner edge bonded elastic material, so that the dust seal assembly is installed in the inner ring seal groove of the bearing, in the dust seal assembly and the inner ring seal groove A resilient interference contact is formed to prevent fluid from leaking from the inner ring sealing groove, and when the bearing is installed to prevent the fluid from leaking from the inner ring sealing groove, the fluid is prevented from being sealed from the inner ring. Rolling bearings with leaking slots. If the anti-leakage performance of the bearing is extremely high, the sealing groove of the fixed dust seal assembly can be designed on both the outer ring and the inner ring of the bearing at the same time as the axial space of the bearing allows, and the installation prevents the fluid from sealing the groove from the outer ring. A leak-proof dust seal assembly and a dust seal assembly that prevents fluid from leaking from the inner ring seal groove can produce a rolling bearing with extremely high leakage resistance.

The invention prevents the dust seal assembly and the bearing from leaking from the outer ring sealing groove, and the dustproof seal The steels used in the assembly include, but are not limited to, mild steel and stainless steel, and the elastic materials used include, but are not limited to, oil resistant rubber, oil resistant plastic, and oil resistant felt.

The present invention prevents the dust seal assembly and the bearing from leaking from the outer ring seal groove, and is suitable for all types, structures, sizes of dust seal assemblies and rolling bearings.

DRAWINGS

Figure 1 shows the bearing outer ring seal groove

2A and 2B are respectively the current technology dust cover and the bearing with the dust cover

3A and 3B are respectively the current technical sealing ring and the bearing with the sealing ring

4A and 4B are respectively the current technical collar, the retaining ring combination seal and the bearing with the seal

5A and 5B are dustproof sealing components for partially and completely bonding rubber of the outer edge of the dustproof cover, respectively.

Figure 6 shows the bearing with the outer edge of the dust cover bonded to the rubber dust seal assembly.

7A and 7B show a dustproof seal assembly in which the outer edge and the inner edge of the dust cover are bonded with rubber.

Figure 8 shows the bearing with the rubber dust seal assembly bonded to the outer edge and the inner edge of the dust cover.

Figure 9 is a dust seal assembly composed of a dust cover and a rubber flat washer

Figure 10 shows the bearing with dust cover and rubber flat washer dust seal assembly

11A and 11B are respectively a dust seal assembly composed of a retaining ring of a collar and an outer edge partially and completely bonding rubber.

Figure 12 shows the bearing of the dust seal assembly consisting of the retaining ring of the rubber ring and the outer edge of the rubber.

Figure 13 is a dust seal assembly composed of a collar, a retaining ring and a rubber flat washer.

Figure 14 shows the bearing of the dust seal assembly consisting of a collar, a retaining ring and a rubber flat washer.

detailed description

Under the harsh conditions of rotation of the outer ring of the bearing and high acceleration/deceleration, the grease in the bearing or the base oil in the grease will accumulate at the sealing groove of the outer ring of the bearing due to the influence of centrifugal force, and because of the fluid The adhesion and the adhesion of the lubricant ooze or leak from the outer ring sealing groove, causing the bearing to fail prematurely. Of course, in the case of external fluid medium around the bearing, these fluid media are also likely to penetrate into the bearing cavity from the bearing outer ring sealing groove. Once it occurs, the lubricant contaminating the bearing cavity will also cause early bearing failure. The fluid or colloid penetrates into the bearing cavity from the outside through the small gap existing between the sealing component and the outer ring sealing groove, and leaks from the bearing cavity, which not only jeopardizes the running reliability and operating life of the bearing, but also acts on the host or The product brings harm. In serious cases, it may even endanger the safe operation of certain types of main engines such as elevators and thus endanger personal safety. Therefore, it has attracted great attention from relevant engineering fields.

The present invention provides a dust seal assembly for preventing leakage of fluid from an outer ring seal groove and a bearing using the same, the basic idea of which is a contact area between the dust cover and the outer ring seal groove of the prior art. Arranging an elastic body, such as rubber, so that the dust seal assembly and the outer ring seal groove form a resilient interference contact between at least one of the bottom surface, the top surface and at least one of the front surfaces, thereby completely blocking the dust seal assembly and the outer ring seal groove The slight gap between the seals prevents the leakage of fluid lubricants in the bearings, such as grease, from the leaks or external fluids from the inside to the bearing cavity, thus preventing some possible hidden dangers caused by lubricant leakage or external foreign matter infiltrating into the bearing. And hazards.

The invention will be described in detail below with reference to the accompanying drawings.

Embodiment 1 The dustproof sealing component of the outer edge of the dustproof cover bonding rubber

As shown in FIG. 5A, a dustproof sealing assembly is partially bonded to the outer edge of the dustproof cover. The partial bonding means that at least one of the bottom surface, the top surface and the front surface of the outer edge of the dustproof cover is bonded to the oil resistant rubber by a vulcanization process. Of course, in order to increase the bonding strength, the bonding surface can be enlarged to the bevel portion of the dust cover, but the adhesive of the bevel surface and the bevel portion of the dust cover does not have a chance to contact the outer ring dust groove of the bearing, as shown in Fig. 5A. The dust seal assembly formed by the bottom surface of the dust cover and the beveled surface is rubber-like. The dust seal assembly is similar in design to the current technical dust cover, except that the bottom surface and the inclined surface of the outer edge of the dust cover are vulcanized. The process is bonded with oil-resistant rubber. The dust-proof seal assembly is pressed into the outer ring seal groove of the bearing through the die, except that the dust seal assembly is pressed into the outer ring seal groove of the bearing, due to the bottom surface. Hanging glue forms a elastic interference contact with the bottom surface of the dust-proof groove, and the fluid lubricant sealed in the inner cavity of the bearing cannot pass through the elastic interference contact area, so there is no chance to leak from the outer ring sealing groove. Similarly, if The external environment in which the bearing operates has a fluid medium through which the fluid medium cannot penetrate into the bearing cavity.

As shown in FIG. 5B, the dust seal assembly is a rubber seal member which is all bonded to the outer edge of the dust cover. All the adhesive fingers are bonded to the oil-resistant rubber by the vulcanization process on the bottom surface, the top surface and the front surface of the outer edge of the dust cover. In order to increase the bonding strength, the adhesive surface can be enlarged to the bevel portion of the dust cover, but the adhesive of the bevel and the bevel portion of the dust cover does not have a chance to contact the outer ring dust groove of the bearing. The dust seal assembly is similar in design to the current technology dust cover, except that the oil seal rubber is bonded to the outer edge of the dust cover by a vulcanization process, and the dust seal assembly passes the same as the current technology dust cover. The die is pressed into the outer ring sealing groove of the bearing, but after the dust seal assembly is pressed into the sealing groove of the outer ring of the bearing, the outer edge of the dustproof groove forms a elastic interference contact with the bottom surface, the top surface and the front surface of the dustproof groove. The fluid lubricant sealed in the bearing cavity cannot pass through these elastic interference contact areas, so there is no chance to leak from the outer ring sealing groove. Similarly, if the bearing works in the external environment with fluid medium, the fluid medium cannot pass through these. The elastic interference contact area penetrates into the bearing cavity.

Embodiment 2, the bearing of the rubber dustproof seal assembly is bonded by the outer edge of the dust cover

The bearing shown in FIG. 6 includes a bearing outer ring 61, an inner ring 62, a rolling element 63, a retainer 64, a grease 65 and a dust seal assembly 66. The dust seal assembly 66 is the dust cover of the first embodiment. The dust-tight sealing component of the edge-bonding rubber is a dust-proof sealing component which is bonded to the bottom surface of the outer edge of the dust-proof cover as shown in FIG. 5A, and the dust-proof sealing component 66 is pressed into the outer ring 61 by the die. In the groove, an interference contact is formed on the bottom surface, the top surface, and the front surface. However, since the dust seal assembly 66 is attached to the bottom surface, a flexible interference contact is formed with the bottom surface of the sealing groove of the outer ring 61, due to the elastic interference. In the presence of contact, even if the bearing is operated under very harsh working conditions, the grease 65 is not likely to leak from the sealing groove of the bearing outer ring 61 to the outside of the bearing, thereby ensuring the running reliability and operating life of the bearing and even the main engine. .

Embodiment 3, the dustproof sealing component of the outer edge and the inner edge of the dustproof cover are bonded with rubber

The current technical dust cover, as shown in FIG. 2A, is an "L" type bead at the inner edge, and the bead and the inner ring of the bearing or the sealing groove form a dust seal pair, but the dust seal pair It can only be non-contact, and the ability and effect of dustproof sealing is limited. In order to improve the dust-tight sealing ability between the inner ring and the inner ring of the bearing, the inner edge of the dust cover can be removed, and the oil-resistant rubber can be bonded by the vulcanization process at the inner edge. These rubber sealing lips can be combined with the inner ring of the bearing. The edge or the sealing groove forms a labyrinth and contact seal. As described in the first embodiment and the second embodiment, in order to improve the dustproof sealing capability between the dust seal assembly and the outer ring of the bearing, the glue should be attached to the outer edge of the dust cover. Therefore, in order to simultaneously improve the dustproof sealing ability between the dust seal assembly and the bearing outer ring and the inner ring of the bearing, it is necessary to simultaneously bond the rubber to the outer edge and the inner edge of the dust cover by a vulcanization process, if the bearing is not large, The glue can be attached to the side of the dust cover.

Figure 7A shows the dust-proof seal assembly with the inner and outer edges of the dust cover bonded to the rubber, but the rubber is not bonded to the middle, which is suitable for the dust seal assembly with a relatively large size. Figure 7B shows the dust cover. The dust seal assembly of the side-body bonded rubber is suitable for a dust seal assembly of a small size. As can be seen from Figures 7A and 7B, the dust cap has no inner edge crimping and is instead a rubber sealing lip. The dustproof sealing assembly is punched into the bearing outer ring sealing groove through the die, and forms an elastic interference contact between the outer edge of the dustproof cover and the bearing outer ring sealing groove, and the rubber sealing lip and the inner ring rib at the inner edge of the dustproof cover A contact seal is formed between them.

In the fourth embodiment, the bearing with the outer edge and the inner edge of the dust cover is bonded to the rubber dust seal assembly.

The bearing shown in FIG. 8 includes an outer ring 81, an inner ring 82, rolling elements 83, a retainer 84, a grease 85, and a dust seal assembly 86, 86 which are the one side of the dust cover described in the third embodiment of FIG. A rubber dust seal assembly. The dust seal assembly 86 is pressed into the seal groove of the outer ring 81 through the mold, and forms a elastic interference contact with the seal groove surface of the outer ring 81 at the outer edge of the dust cover of the dust seal assembly 86, thereby preventing the bearing from being worn. The inner grease 85 leaks outward from the sealing groove of the outer ring 81; at the same time, the rubber sealing lip of the inner edge portion of the dustproof cover of the dust seal assembly 86 forms a labyrinth contact seal with the rib of the inner ring 82 of the bearing, which is large. The amplitude increases the dust-tight sealing ability of the bearing inner ring seal pair. Dustproof The bearing of the one-piece body-bonded rubber dust seal assembly on the cover side also has the ability to prevent fluid or dust media outside the bearing from penetrating into the interior of the bearing.

Embodiment 5: dustproof sealing component composed of dustproof cover and rubber flat washer

As shown in FIG. 9, the dust seal assembly comprises a dust cover and a rubber flat washer, the dust cover is outside, the rubber flat washer is placed inside, the two are kept axially concentric, and the outer diameter of the rubber flat washer is not less than the outer diameter. The diameter of the rib of the ring is 0.5 mm, which is not greater than the sum of the top diameter of the outer ring seal groove, the width of the two groove tops, and the length of the two slope faces. The installation sequence of the dust seal assembly into the seal groove of the bearing outer ring is as follows : Put the rubber flat washer into the outer ring seal groove of the bearing, and then use the mold to punch the dust cover. At this time, the dust cover is fixed in the outer ring seal groove, and the rubber flat washer is also fixed at the same time. Between the dust cover and the outer ring seal groove of the bearing, and the elastic interference contact is formed at the contact portion of the dust cover, the rubber flat washer and the bearing outer ring seal groove.

Embodiment 6, the bearing of the dust seal assembly using the dust cover and the rubber flat washer

As shown in FIG. 10, the bearing includes an outer ring 101, an inner ring 102, a rolling element 103, a retainer 104, a grease 105, and a dust seal assembly 106. The dust seal assembly 106 is made of rubber as described in the fifth embodiment. The gasket 1061 and the dust cover 1062 are composed. The outer diameter of the rubber flat washer 1061 is not less than the diameter of the rib of the outer ring plus 0.5 mm, not larger than the diameter of the outer ring seal groove top, the width of the two groove tops, and the length of the two slope faces. Sum. When assembling, the rubber flat washer 1061 and the bearing outer ring 101 are axially concentrically placed in the bearing outer ring sealing groove, and then the dust cover 1062 is punched into the bearing outer ring sealing groove by the mold, and the rubber flat washer 1061 is clamped. A resilient interference contact is formed between the dust cap 1062 and the seal groove of the outer ring 101, thereby preventing the grease 105 in the bearing from leaking out of the seal groove of the bearing outer ring 101.

Embodiment 7: a dustproof sealing assembly composed of a retaining ring of a rubber ring and a rubber edge of the outer edge

For the micro-small bearing seal, in order to avoid the outer ring deformation and precision deterioration caused by the dust cover or the skeleton rubber seal ring being pressed into the outer ring seal groove, the retaining ring and the retaining ring are sealed, and the retaining ring is placed in the sealing groove. After the middle and rear of the collar, the collar is fixed in the outer ring sealing groove, and the retaining ring is fixed in the sealing groove, and the retaining ring has the effect of dustproof sealing. In such a dustproof sealing assembly, the fluid lubricant sealed inside the bearing leaks from the bearing groove of the bearing outer ring under severe working conditions. To avoid this risk, the present invention passes the vulcanization at the outer edge of the retaining ring. Process bonding oil resistant rubber.

11A is a dust seal assembly composed of a retaining ring of a rubber ring and a rubber edge on the outer edge of the outer edge. The retaining ring is located inside and the collar is outside, and the two are axially concentric. The dust seal assembly is mounted on the outer ring of the bearing. After the middle, the rubber adhered to the bottom surface of the retaining ring forms a resilient interference contact with the bottom surface of the outer ring seal groove.

Figure 11B is a dust seal assembly composed of a retaining ring of a rubber ring and a bottom edge, a top surface and an outer surface which are bonded with rubber. The retaining ring is located inside and the retaining ring is outside, and the two axial axes are concentric, and the dust seal assembly is installed. After the bearing outer ring seal groove, the rubber adhered to the bottom surface of the retaining ring forms a resilient interference contact with the bottom surface of the outer ring seal groove. The rubber and the collar and the sealing groove which are bonded to the top surface of the retaining ring form elastic interference contact.

Embodiment 8 is a bearing of a dust seal assembly composed of a rubber ring and a rubber ring

As shown in FIG. 12, the bearing includes an outer ring 121, an inner ring 122, rolling elements 123, a retainer 124, a grease 125, and a dust seal assembly 126, wherein the dust seal assembly 126 is as shown in FIG. 11A of the seventh embodiment. The utility model comprises a retaining ring 1261 and a collar 1262 which bond rubber at the outer edge, and the collar 1262 fixes itself and the retaining ring 1261 in the sealing groove of the outer ring 121 by elastic deformation, the part where the outer edge of the retaining ring is glued, and the outer ring The sealing groove of 121 forms a resilient interference contact such that the grease 125 within the bearing does not have a chance to leak from the sealing groove of the bearing outer ring 121.

Embodiment 9: dustproof sealing assembly composed of a collar, a retaining ring and a rubber flat washer

As shown in Fig. 13, the dustproof sealing assembly is composed of a collar, a retaining ring and a rubber flat washer. The rubber flat washer is located inside and the collar is outside, and the retaining ring is arranged concentrically in the center axial direction, and is placed in the bearing sealing groove. It is a rubber flat washer, retaining ring, and retaining ring. The retaining ring is fixed in the outer ring sealing groove by elastic deformation, and the retaining ring and the rubber flat washer are also fixed in the outer ring sealing groove, and the retaining ring and the rubber A resilient interference contact is formed between the gasket and the rubber gasket and the bottom surface of the outer ring seal groove.

Embodiment 10, a bearing of a dust seal assembly composed of a collar, a retaining ring and a rubber flat washer

As shown in FIG. 14, the bearing includes an outer ring 141, an inner ring 142, rolling elements 143, a retainer 144, a grease 145, and a dust seal assembly 146, wherein the dust seal assembly 146 is flattened by rubber as described in the ninth embodiment. The gasket 1461, the retaining ring 1462, the collar 1463, the collar 1463 fixes itself, the retaining ring 1462 and the rubber flat washer 1461 in the sealing groove of the outer ring 141 by elastic deformation, the retaining ring 1462 and the rubber washer 1461, the rubber washer 1461 and A resilient interference contact is formed between the bottom surfaces of the outer ring 141 and the resilient interference contact prevents leakage of the grease 145 from the sealing groove of the bearing outer ring 141.

The above embodiments are convenient for comparison with the prior art, and both use single row deep groove ball bearings. In fact, the technical principle and scheme adopted by the present invention for preventing the leakage of fluid from the outer ring sealing groove and the bearing are suitable for all Rolling bearings of all types, all materials, all sizes, and all processes can also be used as one of the dust seal assemblies of the present invention on one side of the bearing and another dust seal assembly on the other side as needed.

The above disclosure is only a few specific embodiments of the present application, but the present application is not limited thereto, and any changes that can be made by those skilled in the art should fall within the protection scope of the present application.

Claims

A dustproof seal assembly for preventing fluid from leaking from a seal groove of a bearing outer ring, characterized in that: the dust seal assembly comprises a single composite structure composed of an elastic material bonded to the outer edge of the metal dust cover, or A combination of two or more parts axially concentrically combined, one of which is entirely made of an elastic material or the part is made of a metal material but bonded to the outer edge of the elastic material to protect the bearing from dust The seal assembly and the bearing outer ring seal groove form a resilient interference contact between the bottom surface, the top surface and at least one of the front three faces to block a slight gap between each other.
A dust seal assembly according to claim 1, wherein the composite structure is formed by axially concentrically combining two or more parts, and the part made of an elastic material or the outer edge is bonded to the elastic material. The parts are arranged inside, and the other part is a collar, which is arranged outside and the remaining parts are arranged centrally.
The dust seal assembly according to claim 1, wherein: said dustproof seal assembly of said single composite structure, said metal dust cover comprises a pure metal dust cover with an inner edge of "L" type crimping and The inner edge is not covered with a metal bead, but a rubber sealing lip metal dust cover that bonds the rubber sealing lip by a vulcanization process. The elastic material bonded to the outer edge of the metal dust cover is an oil resistant rubber and is bonded by a vulcanization process.
The dust seal assembly according to claim 1, wherein the dust seal assembly of the combined structure comprises two parts of a flat washer and a metal dust cover made of an elastic material, and the flat washer is dust-proof inside. The cover is arranged concentrically in the outer axial direction, and the selected elastic material is oil resistant rubber.
The dust seal assembly according to claim 1, wherein the dust seal assembly of the combined structure comprises a retaining ring and a metal retaining ring which is bonded with an elastic material at an outer edge, and the retaining ring is inside. The collar is arranged concentrically outside the outer axis,

The selected elastomer is an oil resistant rubber that is bonded by a vulcanization process.
The dust seal assembly according to claim 1, wherein the dust seal assembly of the combined structure comprises three parts of a collar, a metal retaining ring and a flat washer made of an elastic material, and the flat washer is inside. The retaining ring is centered, the collar is arranged concentrically in the outer axial direction, and the selected elastic material is oil resistant rubber.
The dust seal assembly according to claim 1 or 3, wherein the outer edge is bonded to the metal dust cover of the elastic material, and the elastic material is bonded to the portion of the dust cover that is in contact with the seal groove of the outer ring of the bearing. On either or all of the surfaces, the bond site may extend to a curved surface where the dust cap does not contact the seal groove.
The dust seal assembly according to claim 5, wherein the outer edge is bonded to the metal retaining ring of the elastic material, and the elastic material is bonded to the outer edge of the retaining ring to contact the outer ring sealing groove and the collar of the bearing ring. On one to all surfaces, the bond site can extend to the top of the retaining ring that is not in contact with the seal groove and the collar.
A rolling bearing for preventing leakage of fluid from an outer ring sealing groove, comprising a bearing outer ring, an inner ring, a rolling element, a retainer, a fluid lubricant and a dust seal assembly, characterized in that the dust seal assembly A dust seal assembly for preventing leakage of fluid from an outer ring seal groove according to claim 1, the dust seal assembly being mounted outside the bearing by radial or/and axial interference contact with the outer ring seal groove On the circle.
The rolling bearing according to claim 9, wherein the dust seal assembly mounted thereon is the unitary composite structure according to any one of claims 1, 3, and 7, and the elastic cover is crimped by the outer edge. The deformation is fixed in the outer ring sealing groove, and the elastic material adhered on the outer edge of the dust cover is interposed between the dust cover and the sealing surface of the sealing groove to form a elastic interference contact.
The rolling bearing according to claim 9, wherein the dust seal assembly mounted thereon is the combined structure according to any one of claims 1, 2, and 4, and the flat washer made of an elastic material is placed inside, and the metal is protected. The dust cover is externally fixed, and the dust cover is fixed in the outer ring seal groove by elastic deformation of the outer edge curling edge, and the elastic material flat washer is sandwiched between the dust cover and the sealing groove, forming a elastic interference contact.
The rolling bearing according to claim 9, wherein the dust seal assembly mounted thereon is the combined structure according to any one of claims 1, 2, 5, and 8, and the metal block of the elastic material is bonded to the outer edge. Inside the ring, the collar is outside, and the two are fixed in the outer ring sealing groove by the elastic deformation of the collar, and the elastic material is interposed between the retaining ring and the sealing groove, the matching surface of the ring and the collar, forming elasticity. Profit contact.
The rolling bearing according to claim 9, wherein the dust seal assembly mounted thereon is the combined structure according to any one of claims 1, 2, and 6, wherein the flat washer made of an elastic material is inside and the collar is The outer part and the retaining ring are centered, and the three are fixed in the outer ring sealing groove by the elastic deformation of the collar, and the elastic material is interposed between the retaining ring and the sealing surface of the sealing groove to form an elastic interference contact.
A rolling bearing according to any one of claims 10 to 13 wherein the selected elastomeric material is an oil resistant rubber bonded by a vulcanization process.