KR101037748B1

KR101037748B1 - Slewing bearing and method for forming seal thereof

Info

Publication number: KR101037748B1
Application number: KR1020100129806A
Authority: KR
Inventors: 민신기
Original assignee: (주)신일정밀
Priority date: 2010-12-17
Filing date: 2010-12-17
Publication date: 2011-05-27

Abstract

Slewing bearing of the present invention is an outer race formed with an outer groove along the inner peripheral surface on one side of the inner peripheral surface; Is disposed in the inner circumferential surface of the outer race, the outer race and the step is formed so that one side enters than one side of the outer race, the other side protrudes than the other side of the outer race, the inner race formed an inner groove along the outer circumferential surface on the outer circumferential surface ; A plurality of steel balls interposed between the inner circumferential surface of the outer race and the outer circumferential surface of the inner race; And a seal in which one side is inserted and coupled to each of the outer groove and the inner groove, and the other side is seated on each of the inner race and the outer race, wherein the seal has a ring shape in which both ends are coupled to each other. The mutual coupling of the by the thermal bonding between the adhesive rubber interposed between the both ends and the both ends of the seal.
According to this, when the adhesive rubber is interposed between both ends of the seal made of rubber, and thermal fusion is performed, it is caused by heat shrinkage due to environmental change such as temperature change when using a conventional adhesive or wear due to continuous use. It is possible to prevent frequent separation of the binding site between the two ends, and has the advantage of preventing the occurrence of burr (Burr) of the bonding site.

Description

Slewing Bearing and Seal Forming Method of Slewing Bearing {SLEWING BEARING AND METHOD FOR FORMING SEAL THEREOF}

BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a slewing bearing and a method for forming a seal of the slewing bearing, and in particular, a slewing bearing characterized by a seal for preventing foreign matter from penetrating into the space between the inner race and the outer race and the seal formation of the slewing bearing. It is about a method.

In general, a bearing refers to a mechanical element that fixes a shaft of a rotating machine to a fixed position, and rotates the shaft while supporting the weight of the shaft and the load on the shaft.

Among these bearings, the slewing bearing is characterized by a structure in which gears existing inside and outside are engaged with each other in addition to the above elements, and are mainly used in a turning device of a crane or a large construction machine.

Conventional slewing bearings have a ring-shaped outer race, a ring-shaped inner race coupled within an inner circumferential surface of the outer race, and an outer race fixed between an outer race and an inner race. And a plurality of Steelballs that allow the inner race to rotate relative to the steel balls.

Here, the inner race is stepped with the outer race so that one side enters the outer race and the other side protrudes from the outer race.

An outer groove is formed on the inner circumferential surface of the outer race along the inner circumferential surface, and an inner groove is formed on the outer circumferential surface of the inner race along the outer circumferential surface.

One side of a seal made of rubber is inserted into each of the outer / inner grooves, and the other side thereof is respectively seated on the inner / outer race.

The seal prevents external foreign matter from penetrating between the outer race and the inner race during the operation of the slewing bearing to prevent the inner race from rotating relative to the outer race.

However, the seal is formed by attaching both ends of the straight line with an adhesive to be inserted into the outer / inner groove, there is a problem that the bonded portion is easily damaged by the passage of time or the continuous operation of the turning bearing.

When the seal is damaged, foreign matters penetrate into the space between the outer race and the inner race during the operation of the slewing bearing, which in turn hinders the original function of the slewing bearing. In this case, using an excavator or other slewing bearing There is a problem in the equipment that the slewing bearing must be replaced or repaired.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to provide a slewing bearing having a rigid coupling to both ends for forming a ring-shaped seal and a seal forming method of the slewing bearing.

Slewing bearing of the present invention is an outer race formed with an outer groove along the inner peripheral surface on one side of the inner peripheral surface; Is disposed in the inner circumferential surface of the outer race, the outer race and the step is formed so that one side enters than one side of the outer race, the other side protrudes than the other side of the outer race, the inner race formed an inner groove along the outer circumferential surface on the outer circumferential surface ; A plurality of steel balls interposed between the inner circumferential surface of the outer race and the outer circumferential surface of the inner race; And a seal in which one side is inserted and coupled to each of the outer groove and the inner groove, and the other side is seated on each of the inner race and the outer race, wherein the seal has a ring shape in which both ends are coupled to each other. The mutual coupling of the by the thermal bonding between the adhesive rubber interposed between the both ends and the both ends of the seal.

The seal forming method of the swing bearing of the present invention comprises the steps of: inserting both sides of the straight seal in the first mold having a heater and a predetermined distance from the first mold, the second mold having a heater; Disposing an adhesive rubber plate at a position corresponding to both ends of the seal between the first mold and the second mold; Horizontally moving the first mold and the second mold such that the adhesive rubber plates are in contact with both ends of the seal; And applying temperature and pressure to thermally bond between the adhesive rubber plate and both ends of the seal.

A shearing blade having a cross-sectional shape of the seal is formed on an opposite surface of the first mold and the second mold, and the first mold and the second mold are in contact with each other when the first mold and the second mold are in close contact with each other. It is preferable that the intervening adhesive rubber sheet is sheared to the same shape as the cross-sectional shape of the seal.

According to the slewing bearing of the present invention and the seal forming method of the slewing bearing, when the adhesive rubber is interposed between the both ends of the seal made of rubber, and thermal fusion is performed, it is possible to change the environment such as the temperature change by the conventional adhesive. It is possible to prevent the frequent separation of the bonding site between the two ends caused by heat shrinkage or wear due to continued use, and has the advantage of preventing the occurrence of burrs of the bonding site.

Therefore, the damage of the seal can be prevented by the excellent bonding force of the fusion site for forming the ring-shaped seal, so that replacement, repair, etc. of the slewing bearing can be prevented.

1 is a perspective view schematically showing a slewing bearing according to an embodiment of the present invention.
Figure 2 is a perspective view schematically showing a seal of the slewing bearing of Figure 1;
Figure 3 is a flow chart showing sequentially the seal forming method of the swing bearing according to an embodiment of the present invention.
Figure 4 is a perspective view schematically showing a mold used in the seal forming method of the swing bearing of Figure 3;

Hereinafter, a turning bearing of the present invention and a seal forming method of the turning bearing of the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view schematically showing a swing bearing according to an embodiment of the present invention, Figure 2 is a perspective view schematically showing a seal of the swing bearing of FIG.

1 and 2, the swing bearing of the present invention includes a swing bearing 100, an outer race 110, an inner race 120, a steel ball (not shown), and a seal 130.

The outer race 110 and the inner race 120 has a circular ring shape, the outer race type gear is formed on the outer peripheral surface of the outer race 110, the inner race formed gears on the inner peripheral surface of the inner race 120 It may be a wheelless type in which no gear is formed in the type and both.

The inner race 120 is stepwise coupled to the inner circumferential surface of the outer race 110, the steel ball groove (not shown) formed on the inner circumferential surface of the outer race 110 and the steel ball formed on the outer circumferential surface of the inner race 120 The inner race 120 rotates on the inner circumferential surface of the outer race 110 with respect to the outer race 110 by a plurality of steel balls interposed between the grooves (not shown).

The inner circumferential surface of the outer race 110 and the outer circumferential surface of the inner race 120 are formed with a seal groove (not shown) spaced apart from the steel ball groove along the inner circumferential surface.

One side of the seal 130 is inserted and coupled to the seal groove, and the other side of the seal 130 is seated on the inner race 120 and the outer race 110, so that the seal 130 is the outer race. Covers the space formed between the 110 and the inner race 120.

The seal 130 also has a ring shape as well as the outer race 110 and the inner race 120, and the portion coupled to the seal groove may have a form in which the hill and the valley are alternately formed, and the portion exposed to the outside. Has a predetermined angle inclined form.

In the case of the seal 130, it is formed in a long straight shape of the rubber material, both ends are combined to form a ring shape as a whole, the bonding of the two ends is not bonded by the conventional adhesive, but the adhesive material of the same material or similar material as the rubber material The adhesive rubber (not shown) and both ends are integrally formed by heat fusion in a state in which rubber is interposed between both ends.

When forming the ring-shaped seal 130 as described above, when the adhesive rubber is interposed between the both ends of the seal 130 of the rubber material, and then by thermal fusion, environmental changes such as temperature changes when using a conventional adhesive It is possible to prevent the frequent separation of the bonding site between the two ends caused by heat shrinkage or wear due to continued use, and has the advantage of preventing the occurrence of burrs of the bonding site.

Therefore, by preventing the damage of the seal 130 by the excellent bonding force of the fusion site for forming the ring-shaped seal 130, it is possible to prevent replacement or repair of the swing bearing 100.

3 is a flow chart sequentially showing a seal forming method of the swing bearing according to an embodiment of the present invention, Figure 4 is a perspective view schematically showing a mold used in the seal forming method of the swing bearing of FIG.

3 and 4, the seal forming method of the swing bearing of the present invention is as follows.

First, a step (S1) of inserting a straight seal into a mold in which a heater is embedded.

That is, both sides of the straight seal 130 are seated on the lower plates 211 and 221 of the first mold 210 and the second mold 220, respectively, and then the upper plates of the first mold 210 and the second mold 220 are mounted. 212 and 222 are seated on the respective lower plates 211 and 221.

In this case, the first mold 210 and the second mold 220 are spaced apart by a predetermined distance, and one side and the other side of the straight seal 130 inserted into the first and second molds 210 and 220 face each other on the same line. .

Meanwhile, a shear blade 213 is formed on surfaces of the first mold 210 and the second mold 220 that face each other.

The shear blade 213 is formed in the same shape as the cross-sectional shape of the straight seal 130.

That is, one side of the mountain and the valley are alternately formed, the other side is a shear blade is formed in a predetermined angle inclined form.

Next, the adhesive rubber plate 240 is disposed between the first mold 210 and the second mold 220 (S2).

The disposition position of the adhesive rubber plate 240 is a position corresponding to both ends of the straight seal (130).

Next, the first mold 210 and the second mold 220 are moved horizontally with each other so that the adhesive rubber plate 240 is interposed therebetween, and one surface of the first mold 210 and the second mold ( One surface of the 220 is in contact with each other to press the adhesive rubber plate 240 from both sides (S3), and also to drive the heater in the first and second molds (210, 220) to the adhesive rubber plate 240 and the first, 2 both ends of the straight seal 130 in the mold (210,220) to be heat-sealed (S4).

At this time, the adhesive rubber plate 240 by the pressure of the first and second molds 210 and 220 is formed as a cross-sectional shape of the straight seal 130 by a shear blade 213, the straight seal 130 It is heat-sealed with both ends of.

When the seal 130 constituting the slewing bearing is formed by the above-described method, a ring shape may be formed by combining both ends of the straight seal 130 by a heat fusion method through the adhesive rubber plate 240. Therefore, it is possible to prevent the easy falling phenomenon of the adhesive portion due to the use environment conditions when bonding with the conventional adhesive, and also can provide an advantage of preventing the burr phenomenon occurred in the bonded portion.

Therefore, by preventing the seal from being damaged by the fusion site of the seal having excellent bonding force, it is possible to prevent replacement or repair of the slewing bearing.

130 ... Seal
210 ... first mold
213 ... Shear blade
220 ... second mold
240 ... Adhesive Rubber Sheet

Claims

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Inserting both sides of the straight seal in a first mold having a heater and a distance separated from the first mold and having a heater, respectively;
Disposing an adhesive rubber plate at a position corresponding to both ends of the seal between the first mold and the second mold;
Horizontally moving the first mold and the second mold such that the adhesive rubber plates are in contact with both ends of the seal;
And applying temperature and pressure to thermally bond between the adhesive rubber plate and both ends of the seal.
A shearing blade having a cross-sectional shape of the seal is formed on an opposite surface of the first mold and the second mold, and the first mold and the second mold are in contact with each other when the first mold and the second mold are in close contact with each other. And the interleaved rubber sheet is sheared in the same shape as the cross-sectional shape of the seal.

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