KR102023909B1 - An oil sealing apparatus - Google Patents

Abstract

The present invention relates to an oil sealing device, and is formed on the inner diameter side of the annular bearing housing (10) so as to continuously supply lubricating oil to the bearing (2) for rotatably installing the rotating shaft (1) to the support portion. The open outer side of the bearing housing 10 is sealed so that the oil receiving space 15 is formed between the annular groove 14, which is fixed to the bottom of the groove 14, and the first contact part 24 is closed. Oil provided with a provided fixed portion 20 and a second contact portion 32 which is rotated in contact with the first contact portion and is fixed to the outer circumferential surface of the rotation shaft 1 and rotated together with the rotation shaft 30. In the sealing device, the oil leakage preventing O-ring 35 disposed in the groove portion 33 formed on the outer surface of the rotary part 30 so that the rotary part 30 and the rotary shaft 1 are integrated by the expansion force of the compressed O-ring 35. O-ring 35 to hold it in place while pressing It is characterized in that it further comprises a fixing plate 50 is fixed to the rotating member 30, the outer peripheral surface end is fixed to the rotating member 30, by reducing the frictional heat to the contact portion of the fixed portion and the reduced contact of the rotating portion oil by heat With the effect of preventing the lowering of the viscosity and the improved structure of rotatable mounting of the rotating part against the fixing part without the use of bolts, the assembly work is very simple, reducing the number of parts by reducing the manufacturing cost, and the O-ring of the rotating part The annular fixing plate inserted into the groove can be easily mounted.

Description

Oil Sealing Equipment {AN OIL SEALING APPARATUS}

The present invention relates to an oil sealing device, and in particular, an oil sealing device having an improved structure so as to easily mount an oil sealing O-ring mounted on a rotating shaft to prevent oil leakage and to minimize friction of the rotating part against the fixing part. will be.

Generally, a seal device is provided to prevent leakage and leakage of gearbox, spindle, machine tool, pump pump, oil pump, fan, mill, roller, and mixer bearing. Prevent leakage or leakage of lubricating oil around the rotating shaft.

In particular, oil is supplied for smooth rotation of the rotating part with respect to the fixed part, which prevents oil leakage or leakage of the oil to prevent the contamination of the surroundings, and minimizes mechanical wear of the contact part with the rotating shaft. In order to keep the rotation of the rotating shaft smoothly to minimize the power loss and to dissipate heat generated from the friction portion to supply the oil to the rotating shaft to cool the friction portion. Such oil supply is required to maintain a constant pressure of the oil supplied around the rotating shaft with respect to the fixed part so that dynamic unbalance of the shaft does not occur. Therefore, a sealing device including an O-ring seal around the rotating shaft is supplied with oil. Is provided.

As an example of a conventional sealing device, Korean Utility Model Model No. 20-0420819 (registered on June 29, 2006) includes a sleeve (10) having one end of a bellows-type spring welded and formed by pressing a stainless steel sheet. ) The compact seal formed by welding and attaching to the bellows-type spring fixing plate integrally formed with the other end to the outer surface of the rotating ring fixing piece and inserting the rotating ring to the inner surface of the rotating ring fixing piece between the rotating shaft bearing and the oil seal cover. While the sleeve is fixed to the rotating shaft so that the sleeve is fitted in the space of the oil seal cover, the fixed plate surface and the rotary ring surface closely attached to the inner side of the oil seal cover are fixed and tightened by tightening the sleeve outer end with the sleeve fixing plate. Insert the rubber ring to tighten both ends of the sleeve fixing plate with a bowl to fix the sleeve integrally fixed to the rotating shaft A compact mechanical seal device is disclosed.

In addition, the present applicant in the Republic of Korea Patent Publication No. 10-2016-0148880 (December 27, 2016), in the oil sealing device for preventing the oil provided around the rotating shaft from leaking, the periphery of the rotating shaft Is provided in, the rotating portion rotates together as the rotating shaft is rotated; And a fixing part provided at a periphery of the rotating shaft, at least a part of which is in contact with the rotating part, wherein at least one of the rotating part or the fixing part is provided with an elastic member, and the rotating part and the fixing part are formed of the elastic member. It is in close contact with each other by the elastic force, the rotating shaft may be coupled to the rotating part to be integrally rotated with the rotating shaft, one side is fixed to the bearing housing, the elastic member for generating the tension is the first contact portion or the second Pressing the contact portion prevents oil from leaking from the contact surface between the first contact portion and the second contact portion, and in particular, the elastic member is provided with a metal plate-shaped bellows to allow oil to leak while allowing axial movement of the rotating part. It has been proposed an oil sealing device to prevent this.

However, in the above-mentioned conventional sealing devices, the bellows-type spring is used to automatically compensate for wear between the rotating part and the fixing part perpendicular to the rotating shaft of the surface contact type, so that the sealing can be continuously maintained to store the oil of the rotating part. Although there is an advantage of preventing oil leakage in the oil receiving portion, an excessive frictional heat is generated in the contact surface between the fixed portion and the surface-contacted rotating portion, which lowers the oil viscosity so that an oil film at the required pressure cannot be formed. In particular, in the Korean Utility Model Registration No. 20-0420819 (registered on June 29, 2006), the oil seal cover and the sleeve fixing plate are fixed with bolts to fix the copper packing with a structure. The cost increases, and with the passage of time, vibration can loosen the bolts and cause oil leakage. In the sealing device of Korean Patent Application Publication No. 10-2016-0148880 (published December 27, 2016), the second rotating part is bolted to the first rotating part to hold the O-ring in a narrow space. There was a problem that assembly work by bolt fastening is difficult, and there is a problem that oil leakage may occur due to loosening of bolts due to vibration, as well as an increase in the number of parts due to a complicated structure and an increase in manufacturing cost. there was.

In addition, in the sealing device of the Korean Patent Publication No. 10-2016-0148880 (published December 27, 2016), a compression member is coupled to one side of the first rotating part so that the elastic member can be compressed with an appropriate compression force. As a structure, wear occurs due to contact between the rotating first rotating part and the fixed compression member, which makes it difficult to maintain high accuracy and degrades durability.

Korea Utility Model Registration No. 20-0420819 (registered June 29, 2006) Korean Laid-Open Patent Publication No. 10-2016-0148880 (published December 27, 2016)

An object of the present invention is to solve the above problems in the prior art, to simplify the assembly structure by snapping the rotary part with the snap ring against the fixing part without the bolt fastening, and the O-ring contacting the rotating shaft in the groove formed in the rotating part It is to provide an oil sealing apparatus of an improved structure to be kept under pressure by an annular fixing plate assembled by insertion.

In order to achieve the above object, the oil sealing device according to the present invention, the annular formed on the inner diameter side of the annular bearing housing to continuously supply the lubricating oil to the bearing for rotatably installing the rotating shaft to the support portion The open outer side of the bearing housing is sealed so that an oil receiving space is formed between the groove of the groove, the fixing part fixed to the bottom of the groove and provided with a first contact part, and the second contact part which rotates in contact with the first contact part. An oil sealing device having an additional portion and a rotating portion fixed to an outer circumferential surface of a rotating shaft and rotating together with the rotating shaft,

End of the outer circumferential surface of the rotating member while pressing the O-ring from the outside to press the O-ring to be held in place while pressing the oil leakage preventing O-ring disposed on the groove formed on the outer surface of the rotary unit to integrate the rotary unit and the rotating shaft by the expansion force of the compressed O-ring It further comprises a fixing member is fixed.

The fixing member is formed of a washer-shaped plate-like member fitted on the outer circumferential surface of the rotating shaft, the outer peripheral surface end is forced into the fixing groove formed radially outward on the inner surface of the rotating portion while the curved deformation when pressed from the outside of the O-ring It is preferably configured to lose weight.

The inner side of the snap ring which is provided to rotatably support the outer side of the rotating part by being pushed into the groove formed on the inner side of the open outer end of the fixing part to prevent the rotating part from falling out, It is desirable to provide an annular spacer which is contacted with the rotating part during assembly and removed after assembly.

The end face of the second close contact portion forcibly pressed into the groove of the rotating portion is disposed so as to be rotatably contacted with the first contact portion and the reduced contact surface with respect to the end face of the first contact portion assembled in the annular holder of the fixed portion. It is formed to protrude inward toward the first contact portion.

Oil sealing apparatus according to the present invention by reducing the contact area of the contact portion of the fixed portion and the contact portion of the rotating portion to reduce the heat generated from the contact surface to prevent the decrease in oil viscosity due to heat, and using the bolt The assembly structure is very easy to install the rotatable part against the fixed part instead of the fixed part, which eliminates the difficulty of fastening the bolts in the narrow space and reduces the number of parts and reduces the manufacturing cost. The O-ring disposed between the rotating shaft and the rotating part can be easily mounted by the annular fixing plate inserted into the groove of the rotating part, and the oil leakage can be effectively and stably prevented to improve the reliability of the product. There is.

1 is a perspective view of an oil sealing apparatus according to an embodiment of the present invention.
2 is a partial cross-sectional view showing a state in which the oil sealing apparatus of FIG. 1 is installed on a rotating shaft.
3 is a perspective view showing a process in which an oil sealing apparatus according to an embodiment of the present invention is installed on a rotating shaft, and shows assembling the rotating unit in a state in which a gap maintaining means is interposed in a snap ring fixed to the fixing unit.
Figure 4 is a cross-sectional view of the state after removing the spacing means after assembling the rotating part in the fixed portion in FIG.

Hereinafter, with reference to the accompanying drawings showing an embodiment of the present invention will be described in more detail the present invention.

1 and 2, the present invention can continuously supply oil as lubricating oil to a bearing (2) normally provided for rotatably installing the rotating shaft (1) with respect to a frame or support member (not shown). It is provided in the annular bearing housing 10, the bearing 2 is disposed in the annular groove 11 formed on one side of the bearing housing 10, the outside of the bearing 2 to prevent the separation An annular cap member 5 having an inner diameter smaller than the diameter of the recess 11 is provided so that the bearing 2 is held relative to the bearing housing 10.

A support jaw 12 for supporting the inside of the bearing 2 is formed to protrude inwardly on an inner diameter side of the bearing housing 10, and an outer side of the support jaw 12 has a reduced inner diameter. The groove 14 is formed, the oil receiving space 15 for receiving the oil which can be supplied to the bearing 2 by the sealed outer side opened by the oil sealing apparatus according to the present invention provided in the groove 14 Is formed.

Oil sealing apparatus 100 according to the present invention is a fixed portion 20 is fixed to the bottom of the groove 14 of the bearing housing 10, and the rotating portion 30 is fixed to the outer peripheral surface of the rotary shaft 1 and rotated together with the rotary shaft 30 ).

One end is fixed to the inner diameter side end of the fixing part 20 and the other end is provided with a spring member 25 fixed to the inner end of the annular holder 21, the holder 21 has a bottom portion with reduced inner diameter (22) is formed, the first contact portion 24 is seated on the bottom portion 22 and the outer surface is fixed to the side wall 23 to the side wall 23, the holder 21 is fixed By arranging the close contact portion 24 in a heated state and then cooling the close contact portion 24 is fixed to the side wall 23 of the holder 21 whose cross section is rectangular in cooling and the inner diameter thereof is reduced. At this time, the outer end surface of the close contact portion 24 is fixed to protrude more than the side wall 23 of the holder 21. The bottom of the fixing portion 20 is made of a separate annular member having a protrusion formed by bending the outer end portion, it is preferable that the bent portion of the protrusion is welded and integrated into the inner end of the fixing portion, The end of the spring member 25 is welded to the protrusion.

The spring member 25 is alternately welded to the inner diameter side end and the outer diameter side end of the plate-shaped annular members are joined in a zigzag form to form a bellows spring as a whole to exhibit a strong elastic force.

An o-ring 27 for oil leakage is disposed in an annular groove 26 formed on an outer side surface of the fixing portion 20, and a groove 28 is formed on an inner side of an outer end portion of the fixing portion 20. The outer side wall of the acts as a locking jaw (29).

The rotating part 30 has an annular groove 31 formed on an inner side thereof, and an annular second contact portion 32 is fixed to the recessed portion 31. The oil leakage preventing O-ring 35 is maintained between the outer circumferential surface of the rotation shaft 1 by the fixing plate 50 in the formed recess 33.

The rotating part 30 is inserted and disposed in the open outer end of the fixing part 20, and after the rotating part 30 is inserted into the fixing part 20, the outer part of the fixing part 22 does not prevent the rotating part 30 from being pulled out. The outer surface of the rotating part 30 is rotatably supported by the snap ring 40 press-fitted into the groove 28 formed in the inner surface of the end.

When assembling the rotary part 30, the rotary part 30 is assembled with the annular spacer 43 made of paper interposed on the inner surface of the snap ring 40 facing the rotary part 30, and then the spacer ( 43) by tearing and removing, it is maintained in a state of high assembly precision between the rotary part 30 and the snap ring 40, thereby solving the problem of deterioration of precision and durability due to wear caused by contact during conventional rotation and sealing The device can be compactly configured.

The rotary part 30 has an inner end surface (inner end surface) in order to assemble the annular second tight contact portion 32 that is forcedly pressed into the annular groove 31 formed therein. 36 is formed to protrude, and when the second contact portion 32 is inserted into the groove 31 while the rotary part 30 is heated to expand the inner diameter of the groove 31, the groove 31 shrinks during cooling. ), The second close contact portion 32 is fixed in a forced-pressed state. At this time, the protruding end surface 36 of the second contact portion 32 is formed to protrude inward with respect to the inner surface of the rotating part 30.

The second contact portion 32 forcibly pressed into the protruding end surface of the first contact portion 24 assembled to the annular holder 21 of the fixing portion 20 and the groove 31 of the rotary part 30. Protruding end surface 36 of the contact with each other is rotated with the rotating part 30 during the rotation of the rotating shaft (1), the first contact portion 24 and the second contact portion 32 in a fixed state Since it is rotated in contact, the contact surfaces of the first and second contact parts 24 and 32 have a high surface to rotate the second contact part 32 with respect to the first contact part 24 while preventing oil leakage. It must be processed with precision. For this purpose, a lapping process is usually performed. As described above, the first contact part 24 is forcedly pressed into the holder 21, and the second contact part 32 is formed in the groove of the rotating part 30. By lapping in the state of being forced-into 31, it is possible to easily perform the surface machining with a high surface precision.

However, in the prior art mentioned in the description of the prior art, each of the contact parts of the rotating part and the fixing part is separately wrapped, and then assembled in the rotating part and the fixing part by heat press method, even in the process of shrinking during cooling. As the microscopic deformation occurs on the surface of the parts, the lapping should be added to the friction surfaces in contact with each other. In the state in which the close contact is assembled to the rotating part and the fixed part, lapping is very difficult and additional lapping is not possible. There was a problem of oil leakage due to failure to obtain a high degree of precision on the opposing surfaces contacted and wear over time.

In the present invention, the lapping can be performed in a state in which the first and second close parts are assembled with the contact surfaces protruding from the fixing part and the rotating part, thereby obtaining a high degree of precision of the surface. The problem related to the high precision between the close contact portions of is solved, and the high precision is maintained between the contact surfaces of the close contact portions so that the oil leakage problem does not occur.

In addition, as the protruding end surface 36 of the second contact portion 32 is in surface contact with the first contact portion 24 and thus the contact area is reduced in the prior art, the second portion provided and rotated in the conventional art is rotated. It is possible to prevent oil leakage between the first and second contact portions while preventing the drop in oil viscosity due to excessive frictional heat generated at the contact surface with the first contact portion in a state where the contact portion is fixed.

In order to keep the O-ring 35 disposed in the recess 33 formed on the outer surface of the rotating part 30 in place, the fixing plate 50 and the O-ring in the form of a washer in advance on the outer peripheral surface of the rotating shaft 1 The O-ring 35 is disposed in the recess 33 of the rotating part 30 while the 35 is inserted, and a washer shape is formed outside the recess 33 of the rotating part 30, that is, outside the O-ring 35. When the force is applied to the annular plate-shaped fixing plate 50 of the O-ring 35 is pressed in the recess 33.

In addition, as the fixing plate 50 is curvedly deformed as shown in the cross-sectional view of FIG. 4, the outer circumferential surface end portion is forcedly fitted into the fixing groove 37 formed radially outwardly on the inner surface of the rotating part, whereby the surface of the rotating shaft 1 and the rotating part 30 are fixed. ) And the O-ring 35 maintained in a compressed state in the space formed by the fixed plate 50, the oil flowing along the surface of the rotating shaft no longer leaks.

In this way, the rotary part 30 together with the fixed plate 50 is integrated with the rotary shaft 1 by the expansion force of the O-ring 35 compressed by the fixed plate 50 and is rotated without using a separate fixing means.

The first contact part 24 and the second contact part 32 are formed of any one selected from silicon carbide, tungsten, and carbon, and the fixing part 20 and the rotating part 30 are formed. Is preferably formed of a corrosion resistant material, for example stainless steel.

In addition, the O-ring is preferably formed of a corrosion-resistant, heat-resistant elastic material.

The components described in the description of the above embodiments can be variously changed to equivalents by those skilled in the art, and the present invention is not limited thereto but only by the scope of the technical idea of the present invention described in the appended claims.

The present invention can be used in an oil sealing device for preventing oil leakage while supplying oil to a bearing device installed on a rotating shaft.

1: rotating shaft 2: bearing
5 cap member 10 bearing housing
11: recessed part 12; Support
14: groove 15: (oil) accommodation space
20: fixing part 21: holder
22: bottom 23: side wall
24: first contact portion 25: spring member
26, 28: home 27: O-ring
29: locking jaw 30: rotating part
31: groove 32: second close contact
33: groove 35: O-ring
37: fixing groove 40: snap ring
43: spacer 50: fixed plate
100: sealing device

Claims (5)

Between the annular groove 14 formed on the inner diameter side of the annular bearing housing 10 so as to continuously supply the lubricating oil to the bearing 2 for rotatably installing the rotating shaft 1 to the support portion. A fixing part 20 which seals the open outer side of the bearing housing 10 so that an oil receiving space 15 is formed in the bearing housing 10, and which is fixed to the bottom of the groove 14 and provided with a first contact part 24. A second contact portion 32 is provided to rotate in contact with the first contact portion and is fixed to the outer circumferential surface of the rotation shaft 1 to rotate together with the rotation shaft 30, and a recess formed on the outer surface of the rotation portion 30. The O-ring 35 is externally formed so that the rotary part 30 and the rotation shaft 1 are integrated by the expansion force of the O-ring 35 compressed to hold the oil-leakage preventing O-ring 35 disposed in the 33 while pressing. Fixing plate 5 is fixed to the outer peripheral surface end portion to the rotating part 30 while pressing In the oil sealing device having 0),
Snap ring 40 is provided to rotatably support the outer surface of the rotating portion 30 is pressed into the groove 28 formed on the inner side of the open outer end of the fixing portion 20 so that the rotating portion 30 does not fall out On the inner side of the oil sealing device, characterized in that an annular spacer (43) is provided in contact with the rotating part (30) during assembly and removed after assembly to obtain the required precision between the rotating part (30).
The method of claim 1,
The fixing plate 50 is formed of a washer-shaped plate-like member fitted on the outer circumferential surface of the rotating shaft 1, and is curved in a radial direction on the inner surface of the rotating part 30 while being curved when pressed from the outside of the O-ring 35. Oil sealing apparatus, characterized in that the outer peripheral end portion is forced to fit in the fixing groove 37 formed to the outside.
delete The method of claim 1,
The rotating part may be disposed so as to be rotatably contacted with the first contact part 24 and the reduced contact surface with respect to the end face of the first contact part 24 assembled to the annular holder 21 of the fixing part 20. Oil sealing apparatus, characterized in that the end surface (37) of the second contact portion (32) forcibly pressed into the groove (31) formed to protrude inward toward the first contact portion (24).
The method of claim 4, wherein
Mounting of the second contact portion 32 in the groove 31 of the rotating portion 30 is inserted into the second contact portion 32 in the expanded groove 31 by heating the rotating portion 30 to the contraction upon cooling The oil sealing device, characterized in that for assembling the second close contact portion 32 by force.

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