WO2008025220A1

WO2008025220A1 - Double-ring split bearing protector

Info

Publication number: WO2008025220A1
Application number: PCT/CN2007/002391
Authority: WO
Inventors: Jingwei Zhao
Original assignee: Aig Industrial Group
Priority date: 2006-08-24
Filing date: 2007-08-09
Publication date: 2008-03-06

Abstract

A double-ring split bearing protector comprises an elastic outer ring (10) mounted statically in the device frame and an elastic inner ring (20) retained in said outer ring (10). The inner ring (20) ringed on the device shaft is motionless relative to the outer ring (10). The inner ring (20) and the outer ring (10) have a cut (12,22) respectively. Wherein, the bearing protector comprises at least one of an elastic enclasping ring (30) embedded in the outer ring (10) and an axial spring (40) embedded in the inner ring (20). In addition, an insetted joint (16) is provided in the cut. Therefore, the bearing protector has an advantage of easily dismounting and mounting and has good sealing performance.

Description

Double ring split bearing protector

The present invention relates to a double loop split type bearing protector which can have a clasping mechanism and a plug-in type joint. Background technique

In all kinds of mechanical equipment with a rotating shaft, the bearings need to work under lubrication conditions. In many cases, leakage of lubricating oil and entry of external contaminants can cause damage to the bearings, so bearing protection measures are required. Existing bearing protectors are mostly monolithic and require installation from one end of the shaft. This type of bearing protector has the advantage of good sealing performance, but it is inconvenient to disassemble. That is to say, in the case where other parts are mounted on the shaft, they may hinder the disassembly and assembly of the protector.

To this end, a split type bearing protector has been proposed in which the ring structure of the protector is broken at a certain point, that is, there is a slit. Through this slit, the protector can be mounted directly to the shaft or removed from the shaft without interference from other parts. However, due to the presence of the slit, the sealability, operability and reliability of the protector may be degraded. Summary of the invention

The present invention aims to solve these problems in the prior art, that is, to provide a split type bearing protector having a tightening mechanism, which has the advantages of easy disassembly and assembly, and improves sealing, operability and reliability. Sex.

To this end, the present invention provides a double-ring split bearing protector having a tightening mechanism, comprising an elastic outer ring that is statically mounted in a frame of the device and an elastic inner ring that is held in the outer ring, the inner ring set On the shaft of the device and held relative to the outer ring Still, the inner ring and the outer ring respectively have slits, wherein the bearing protector further comprises at least one of an elastic clasp ring embedded in the outer ring and a shaft spring embedded in the inner ring. One.

Preferably, the slits of the inner and outer rings are offset from one another in the circumferential direction of the bearing protector. Preferably, the inner ring has a resilient lip extending obliquely toward the axis of rotation, the resilient lip having a raised portion that urges against the outer circumference of the shaft and that slidably engages the shaft.

Preferably, there is an interference fit between the outer and inner rings.

Preferably, the outer circumference of the outer ring is fitted with an auxiliary clad split ring.

Preferably, an auxiliary sealing split ring is provided between or outside the outer ring and the inner ring. Preferably, the inner and outer rings are made of the same or different rubber and plastic materials.

Preferably, the incision of the outer ring is provided with an insert joint, which is inserted in the circumferential direction at one end of the outer ring and bulges to the sides and the insertion and insertion at the other end of the outer ring The portion is matched with a groove-shaped receiving portion.

Preferably, the slit of the inner ring is provided with a flexible compensating block which is softer than the inner ring and has the same cross-sectional shape as the inner ring.

Preferably, the incision of the outer ring is provided with a plug-in joint, which is provided by an insertion portion at one end of the outer ring and a groove-shaped receiving portion at the other end of the outer ring that matches the shape of the insertion portion. The front end and the rear end of the insertion portion have a lateral dimension smaller than a middle portion thereof.

Preferably, the shape of the insertion portion is a circle, an ellipse or a diamond.

Preferably, the slit of the inner ring is straight.

According to the present invention, the double-ring split type bearing protector has a gripping mechanism, and therefore, the bearing protector has the advantages of easy disassembly and assembly, and high sealing property, operability, and reliability. BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a front view of a bearing protector of a first embodiment of the present invention.

Figure 2 is a cross-sectional view of the bearing protector of Figure 1 taken along line A-A. Figure 3 is a partial enlarged view of the outer ring notch insert of the present invention as seen from the outside of the bearing protector.

Figure 4 is a cross-sectional view showing a bearing protector of a second embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Referring first to Figures 1 and 2, a double-ring split bearing protector in accordance with a first embodiment of the present invention includes an outer ring 10 and an inner ring 20 retained in the outer ring. The outer ring 10 is made of an elastic material such as a rubber material and is statically mounted on the frame of the apparatus in use. The outer circumference of the outer ring 10 is provided with a raised ring 14 to facilitate mounting the outer ring on the frame. The outer ring can be mounted directly on the frame or mounted on the frame with auxiliary components. In order to improve the static sealing performance between the bearing protector and the frame, the outer circumferential side of the outer ring may be provided with an elastic sealing ring. The outer ring 10 holds the inner ring 20 firmly therein. The circumference of the outer ring 10 at the interface of the two is slightly smaller than the circumference of the inner ring 20 at the interface therebetween, thereby causing an interference fit between the outer ring 10 and the inner ring 20. In order to maintain the connection between the two, the inner side of the outer ring is provided with a shape suitable for holding the inner ring. For example, the inner side of the outer ring is opened by an inner ring pocket that matches the outer peripheral shape of the inner ring to hold the inner ring compactly in the inner ring pocket. After the elastic clasp ring is assembled on the outer ring, the outer ring can be pressed against the inner ring, thereby ensuring that the inner ring and the outer ring remain stationary relative to the frame. As an alternative or in addition, an adhesive can be applied between the inner and outer rings. The outer ring 10 is not a continuous ring but a split ring having a slit 12. That is, at the slit 12, the outer ring 10 is broken. The slit 12 can be a straight slit. Alternatively, it is more preferable that the slit 12 has a fitting joint 16 as will be described later. The inner ring 20 that is fitted over the shaft of the device is also made of an elastic material such as a rubber material. The materials used for the inner ring 20 and the outer ring 10 may be the same or different. In addition, the two can have different colors for ease of manufacture and maintenance.

The inner side of the inner ring 20 is formed with an elastic lip 26 extending obliquely inwardly, an annular groove 24 is formed between the lip and the inner ring body, and the lip has a projecting portion 28 directed toward the inner side, the corner The portion forms a loop that is in contact with the rotating shaft of the device, and the circumference of the loop is slightly smaller than the outer circumference of the rotating shaft. In use, the inner ring 20 is fitted over the rotating shaft, and the protruding portion 28 is in contact with the outer circumference of the rotating shaft and is slidably engaged, and is slightly extended by the rotating shaft, that is, slightly elastically retracted to the outer side. Thereby, the lip 26 is tightly surrounded by the corner portion 28 by a certain continuous, uniform elastic thrust against the outer circumference of the rotating shaft without leaving a gap between the inner ring and the rotating shaft.

The inner ring 20 is a split ring having a slit 22 at which the inner ring 20 is broken. The slit 22 can be a straight slit. The slit 22 of the inner ring 20 and the slit 12 of the outer ring 10 are offset by a certain angle in the circumferential direction, for example, 5 ° to 180 °, preferably 10 ° to 90 °, whereby the sealing ability can be improved.

Since both the outer ring and the inner ring are split rings with slits, the bearing protectors can be mounted directly on the shaft or removed from the shaft without interference from other parts. At the same time, since the slits of the outer ring and the inner ring are staggered from each other in the circumferential direction of the bearing protector, it is difficult for foreign matter to pass through the two slits at the same time to invade the bearing protector, and therefore, the sealing performance of the bearing protector can be improved. In order to improve the tightening ability of the bearing protector against the rotating shaft and thus improve the sealing performance, a sleeve can be applied to the outer ring to enclose the outer ring and the inner ring on the rotating shaft. Elastic retaining ring 30. The center of the outer peripheral side of the outer ring 10 is provided with an elastic clasp ring accommodating ring groove 32 (see Fig. 2) for accommodating the elastic clasp ring 30 therein. The length of the elastic clasp ring 30 is less than the circumference of the elastic clasp ring receiving ring groove. The elastic clasp ring 30 can be a continuous uninterrupted ring that can be inserted into the elastic clasp ring receiving ring groove by extending the elastic clasp ring 30. Alternatively, the elastic clasp ring 30 may be detachable, that is, an elongated strip in a normal state, and the detachable elastic clasp ring is more convenient to disassemble. After the elastic clasp ring 30 is placed in the elastic clasp ring accommodating ring groove, the elastic clasp ring is elongated to connect the end and the tail, thereby applying a compressive force to the outer ring to restrain the outer ring and enclose the inner ring. Ring, so that under the action of the outer ring's tightening force and the inner ring's repulsive force, a reliable seal between the inner and outer rings is achieved; in this case, in order to facilitate the stretching of the elastic clasp ring 30 itself, the end-to-end connection can be The first and second ends of the elastic clasp ring 30 are provided with a quick connecting structure, such as a hook structure. The elastic clasp ring 30 can take various forms such as an elastic band, a shaft spring, and the like. In order to improve the joint between the inner ring and the outer ring, the contact portion between the two may be provided with a matching structure, for example, the inner ring is provided with a protrusion protruding outwardly, and the outer ring is provided for accommodating the Protruding grooves, and vice versa. In addition, an auxiliary sealing split ring may be provided between the inner ring and the outer ring or both, to assist in sealing.

As an additional advantageous feature, at the slit 22 of the inner ring 20, a flexible compensating block (not shown) having a softer cross-sectional shape than the inner ring 20 and having the same cross-sectional shape as the inner ring 20 is added, so that the sealing and assembly effect is further improved. it is good. As an additional advantageous feature, the elastic clasp ring can also be used as an elastic sealing ring at the same time. Specifically, the cross-sectional shape (not shown) of the elastic clasp ring may be configured to be adapted to abut against the fitting hole of the frame, thereby improving the bearing protector after the bearing protector is assembled in the frame Static sealing performance between racks The unique insert connector 16 of the present invention is described below with reference to FIG. An insert joint 16 can be formed at the slit 12 of the outer ring 10. That is, at the slit 12, one end of the outer ring has a projecting insertion portion that protrudes in the circumferential direction and bulges toward both sides; the other end of the outer ring has a groove-shaped accommodating portion that matches the insertion portion. Thus, as seen in the radial direction of the bearing protector at the insert fitting 16, the shape of the insertion portion is gradually increased from the front end, and the lateral dimension is gradually decreased after increasing to a certain extent. Therefore, the front end and the rear end of the insertion portion have a lateral dimension smaller than the intermediate portion, and the groove-shaped receiving portion has a corresponding matching shape. For this reason, when the insertion portion is inserted into the accommodating portion, the insertion portion first opens the accommodating portion to both sides to enter the accommodating portion. After the insertion portion enters the accommodating portion, the accommodating portion elastically restores the original shape, and the two form a close fit, thereby forming the outer ring into an integral ring. Since the insertion portion is generally inserted into the accommodating portion in the circumferential direction, the insertion portion and the accommodating portion are required to have sufficient elasticity.

The insert portion may have a circular shape, an elliptical shape, a rhombic shape, other laterally convex shapes, or a combination of different shapes, etc., as seen in the radial direction of the bearing protector at the insert joint 16. By using the insert fitting 16, the structural integrity of the outer ring and even the entire bearing protector can be increased to ensure a more reliable operation of the bearing protector.

Next, a double ring split type bearing protector of a second embodiment of the present invention will be described with reference to FIG. The second embodiment is substantially the same as the foregoing first embodiment in the overall structure, and therefore the same portions will not be repeatedly described. Only the differences of the second embodiment will be described below. As already described above, the lip 26 has a certain elastic thrust through its knurled portion 28. Tightly pushed against the outer circumference of the shaft. However, due to the structure or material of the lip 26 itself, or due to changes in temperature, pressure, etc. during operation, or after long-term use, the elastic thrust may be insufficient, resulting in the inner ring not being able to Hold it securely on the shaft. To this end, an important feature of the second embodiment is that a shaft spring 40 for its tightening action is added to increase the elastic thrust of the lip 26 on the rotating shaft and the tightening action of the inner ring against the rotating shaft, and at the same time increase the inner The outer ring has a tight outer force and a sealing effect.

As shown in Fig. 4, the shaft spring 40 is O-shaped in cross section and is fitted in the annular groove 24 of the inner ring 20. Similar to the elastic clasp 30, the shaft spring 40 can be a continuous uninterrupted ring or a breakable ring. In the latter case, in order to facilitate the end-to-end connection of the shaft springs 40 themselves, a quick-connecting structure such as a shackle or a head-inserted structure may be provided at both ends of the shaft spring 40.

In the second embodiment described above, the elastic clasp ring and the shaft spring for holding are simultaneously provided. However, in the third embodiment of the present invention, only the shaft type spring fitted in the inner ring is provided, and the elastic holding ring fitted in the outer ring is not provided. In this case, the tension of the inner ring and the tension of the outer ring can still achieve the tight seal of the entire bearing protector and the rotating shaft.

As can be seen from the above description of the preferred embodiment, the present invention employs a tightening mechanism to improve the self-encapsulation of the double-ring split bearing protector and the ability to hold the shaft, thereby improving the sealing performance. The holding mechanism may be either or both of an elastic clasp ring embedded in the outer ring and a shaft spring embedded in the inner ring. In addition, the present invention adopts an insert type joint at the slit of the outer ring, thereby facilitating the disassembly and assembly of the double-ring split type bearing protector, and improving the sealing property, the operability and the reliability. The preferred embodiment of the invention has been described above. However, the invention is not limited to the specific structures shown and described herein. Various modifications may be made by those skilled in the art without departing from the scope of the invention.

Claims

Rights request

A double-ring split bearing protector having a tightening mechanism, comprising an elastic outer ring that is statically mounted in a frame of the device and an elastic inner ring held in the outer ring, the inner ring being fitted on the shaft of the device And maintaining a stationary relative to the outer ring, the inner ring and the outer ring respectively having slits, wherein the bearing protector further comprises an elastic retaining ring embedded in the outer ring and a shaft type embedded in the inner ring At least one of the springs, the shaft spring embedded in the inner ring has a tension that is wrapped from the shaft center and outward.

2. The double-ring split bearing protector according to claim 1, wherein the slits of the inner ring and the outer ring are offset from each other in the circumferential direction of the bearing protector.

3. The double-ring split bearing protector according to claim 1, wherein the inner ring has an elastic lip extending obliquely toward the rotating shaft, and the elastic lip has a pushing edge against the outer circumference of the rotating shaft and is slidably engaged with the rotating shaft. The corner.

4. The double-ring split bearing protector of claim 1 wherein an interference fit is formed between the outer ring and the inner ring.

5. The double-ring split bearing protector according to claim 1, wherein the outer circumference of the outer ring is provided with an auxiliary-enclosed split ring.

The double-ring split type bearing protector according to any one of claims 1 to 5, characterized in that an auxiliary seal split ring is provided between or between the outer ring and the inner ring.

The double-ring split bearing protector according to any one of claims 1 to 5, wherein the inner ring and the outer ring are made of the same or different rubber-plastic materials.

The double-ring split type bearing protector according to any one of claims 1 to 5, wherein the slit of the outer ring is provided with an insert type joint, and the insert type joint is located at one end of the outer ring The insertion portion that protrudes in the circumferential direction and bulges to both sides is formed by a groove-shaped receiving portion that is matched with the insertion portion at the other end of the outer ring.

The double-ring split type bearing protector according to any one of claims 1 to 5, wherein the inner ring has a slit which is softer than the inner ring and has the same cross-sectional shape as the inner ring. Compensation block.

The double-ring split bearing protector according to any one of claims 1 to 5, characterized in that the slit of the outer ring is provided with an insert type joint, and the insert type joint is located at one end of the outer ring The insertion portion is formed by a groove-shaped receiving portion at the other end of the outer ring that matches the shape of the insertion portion, and the front end and the rear end of the insertion portion have a lateral dimension smaller than the intermediate portion.

The double-ring split type bearing protector according to claim 10, wherein the insertion portion has a circular shape, an elliptical shape or a rhombic shape.

12. The double-ring split bearing protector of claim 10 wherein the slit of the inner ring is straight.