JP2005226686A - Rolling bearing with sealing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the life of a bearing by preventing the intrusion of foreign matters from the outside and the leakage of lubricant from the inside when used under strict conditions. <P>SOLUTION: The front edge of an inside seal lip 13a provided at the inner peripheral edge of a sealing seal 2a is put in slide contact with the whole periphery of a side wall face 16a on the inside out of a pair of side wall faces 16a, 16b constituting a seal groove 15 formed in the end outer peripheral face of an inner ring 6. The size of each portion is restricted to satisfy D/W<1, where W is the width of a sliding portion between the front edge and the side wall face 16a on the inside in the radial direction of the inner ring 6 and D is the maximum length of an adhesive matter produced on a portion of the side wall face with which the front edge is in slide contact, in the radial direction thereof. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a rolling device with a sealing device that is used by being incorporated in a rotation support portion of various mechanical devices such as a compressor constituting an air conditioner for a vehicle, an alternator that is a generator for a vehicle, and an auxiliary device for a vehicle. It is related with the improvement of a bearing.

  Conventionally, automotive auxiliary equipment such as a compressor that compresses refrigerant by incorporating it into a vapor compression refrigerator incorporated in an air conditioner for automobiles, and an alternator that is a generator for automobiles, is provided by a crankshaft of an automobile engine. In order to drive, an endless belt is stretched between a pair of pulleys provided on the automobile auxiliary machine and the crankshaft. In addition, a rolling bearing is used to rotatably support a pulley provided in the automobile auxiliary machine with respect to a fixed portion. In such an auxiliary machine for automobiles, there is a case where foreign matters such as rain water and muddy water fall directly upon driving. In particular, in recent years, as a result of efforts to reduce the size and weight and reduce costs, rolling bearings built to support pulleys in automotive auxiliary machines are increasingly used in the state exposed to the outside air. Yes. For this reason, foreign matters such as rainwater and muddy water are often directly applied to the rolling bearing, and there is a possibility that a problem that the bearing life is reduced due to the entry of the foreign matter into the rolling bearing. Such a problem may occur similarly in a rotating machine apparatus that may be used outdoors other than automobile auxiliary machines.

  In order to solve the problems that occur in rolling bearings used under such harsh conditions, so-called contact-type seals have been incorporated into both ends of this rolling bearing to make a rolling bearing with a sealing device. Has also been carried out. This hermetic seal prevents intrusion of foreign matter such as rainwater and muddy water from the outside of this rolling bearing, or leakage of grease, lubricating oil, and other lubricants enclosed inside this rolling bearing, or Serves to prevent both.

  FIGS. 5 to 6 show an example of a conventional structure of a rolling bearing with a sealing device that is incorporated in a rotation support portion of a compressor constituting an air conditioner for an automobile and supports a pulley rotatably with respect to a fixed portion. Show. This rolling bearing with a sealing device incorporates a pair of sealing seals 2 and 2 at both ends of a double row ball bearing 1. The double-row ball bearing 1 includes an outer ring 4 having double-row outer ring raceways 3 and 3 formed on the inner peripheral surface, an inner ring 6 having double-row inner ring raceways 5 and 5 formed on the outer peripheral surface, and the outer ring raceways 3. 3 and each inner ring raceway 5, 5 are provided with balls 7, 7, each of which is a rolling element.

  Each of the balls 7 and 7 is rotatably held by a pair of cages 8 and 8, and the inner peripheral surface of the outer ring 4 and the inner ring 6 are sealed by the pair of sealing seals 2 and 2. Both end openings of the internal space 9 in which the balls 7 and 7 are installed are closed between the outer peripheral surfaces. As shown in detail in FIG. 6, each of these sealing seals 2 and 2 reinforces an elastic material 11 such as an elastomer such as rubber with a metal core 10 formed by forming a metal plate such as a steel plate into an annular shape. Thus, the whole is formed in an annular shape. The outer peripheral edge portion of the elastic member 11 protrudes slightly outward in the radial direction from the outer peripheral edge of the core metal 10, and the protruded portions are arranged on the inner peripheral surfaces of both end portions of the outer ring 4. Are fitted and fixed in the locking grooves 12 and 12 formed over the distance. On the other hand, the inner peripheral edge portion of the elastic member 11 is sufficiently protruded radially inward from the inner peripheral edge of the core metal 10, and two inner and outer seals are provided at the tip of the protruded portion. Lips 13 and 14 are formed. And the seal grooves 15 and 15 are formed on the outer peripheral surfaces of the both ends of the inner ring 6 over the entire circumference, and the shafts of the pair of side wall surfaces 16a and 16b constituting the seal grooves 15 and 15 are respectively The tip edge of the inner seal lip 13 is placed on the side wall surface 16a on the inner side in the direction (the “inner side” in the axial direction refers to the inner space 9 side where the balls 7 and 7 are installed, the right side in FIG. 6; the same applies hereinafter). It is slid over the entire circumference. Further, the outer peripheral surfaces of both ends of the inner ring 6 deviate from the seal grooves 15 and 15 in the axial direction (the “outside” in the axial direction refers to the external space side, the left side in FIG. 6, and the same applies hereinafter). The distal end portion of the outer seal lip 14 is opposed to the outer peripheral surface of the portion through a minute gap. Such a rolling bearing with a sealing device is used in a state where the inner ring 6 is externally fitted and fixed to a fixed portion constituting a compressor (not shown), and the outer ring 4 is also fitted and fixed to a pulley (not shown). Although not shown in the drawings, the outer seal lip 14 has a distal end extending over the entire circumference on the outer circumferential surface of the outer circumferential surface of both ends of the inner ring 6 that is outside of the seal grooves 15 and 15 in the axial direction. In some cases, they may be brought into sliding contact. That is, the front end edge of the hermetic seal may be slidably contacted with the outer peripheral surface of the end portion of the inner ring over the entire circumference at two spaced positions.

  According to the rolling bearing with a sealing device configured as described above, the grease enclosed in the internal space 9 in which the balls 7 and 7 are installed is prevented to some extent from leaking to outside. In addition, various foreign substances such as rainwater, mud, and dust existing outside can be prevented to some extent from entering the internal space 9.

  The locking grooves 12 and 12 formed at both ends of the outer ring 4 and the seal grooves 15 and 15 formed at both ends of the inner ring 6 are generally formed by only turning. The turning process is generally performed before the heat treatment step for the outer ring 4 and the inner ring 6. In the processing step after the heat treatment step for the outer ring 4 and the inner ring 6, the locking grooves 12 and 12 and the seal grooves 15 and 15 are hardly additionally processed. Then, a deposit such as a deposit or sludge generated during the heat treatment process adheres to the locking grooves 12 and 12 and the seal grooves 15 and 15 and remains unremoved. For this reason, when the sealing seals 2 and 2 are attached to the double row ball bearing 1 in the process after the heat treatment process, the outer peripheral edge of each of the sealing seals 2 and 2 and the inner surfaces of the locking grooves 12 and 12 There is a possibility that a gap may be generated between the leading edge of each of the hermetic seals 2 and 2 and the side wall surface 16a on the inner side of the seal grooves 15 and 15 due to the adhesive. That is, the adhesive pushes up the outer peripheral edge and the tip edge of the hermetic seals 2, 2, and between the outer peripheral edge and the inner surfaces of the locking grooves 12, 12, and between the tip edge and the inner side wall surface There is a possibility that a gap is formed with respect to 16a. In particular, since the area of the sliding contact portion between the leading edge of the hermetic seals 2 and 2 and the inner side wall surface 16a is small, the gap is likely to occur. When this gap is generated, foreign matter such as rainwater and muddy water enters the interior space 9 and is sealed inside not only when the rolling bearing with a sealing device is rotating but also when it is stationary. Lubricants such as grease and lubricating oil may leak out. In particular, in the case of a rolling bearing that is incorporated in an automobile auxiliary machine such as the above-described compressor and is used to rotatably support a pulley with respect to a fixed part, the automobile auxiliary machine is used as described above. In many cases, foreign substances such as rain water and muddy water are used directly during operation, so that there is a high possibility that foreign substances will enter the internal space 9 in which the balls 7 and 7 are installed.

  Further, when the rolling bearing with a sealing device is rotated, the tip edge of the inner seal lip 13 can be worn early due to adhesions generated on the inner side wall surface 16a of the seal groove 15, and the bearing life can be rapidly reduced. There is also sex. In addition, as the above-mentioned adhesion thing, mainly the welding thing generated by performing heat treatment in the state where the turning scrap (metal piece) generated in the turning process remains attached to the locking groove 15 and the seal groove 12, There is sludge or the like that is generated by performing heat treatment while the oil used as the cleaning liquid before the heat treatment process remains attached to the locking groove 15 or the seal groove 12.

  In the case of the conventional structure shown in FIGS. 5 to 6, a seal groove in which the leading edge of the inner seal lip 13 provided on the inner peripheral edge of the sealable seals 2 and 2 is formed on the outer peripheral surface of the end of the inner ring 6. 15 is in sliding contact with the inner side wall surface 16 a of the sealing seal 2, the tip edge of the seal lip provided on the inner peripheral edge of the sealing seals 2, 2 is in sliding contact with the outer side wall surface 16 b of the sealing groove 15. There is also. Also in this case, if there is an adherent at the sliding contact portion between the leading edge and the outer side wall surface 16b, a gap is formed in the sliding contact portion, or the leading edge is worn at an early stage. Inconvenience occurs. Moreover, there exists patent document 1 as a prior art document relevant to this invention.

JP 2003-42146 A

  In view of such circumstances, the rolling bearing with a sealing device of the present invention prevents intrusion of foreign matters from the outside even when used under severe conditions such as rain water, muddy water, etc. as described above. In addition, the invention has been invented to improve the bearing life by preventing leakage of the lubricant encapsulated in the inside and further suppressing wear of the radial end portion of the hermetic seal.

The rolling bearing with a sealing device of the present invention includes an outer ring, an inner ring, a plurality of rolling elements, and a hermetic seal, like the conventional rolling bearing with a sealing device.
Of these, the outer ring has an outer ring raceway on the inner peripheral surface.
The inner ring has an inner ring raceway on the outer peripheral surface.
The plurality of rolling elements are provided between the outer ring raceway and the inner ring raceway so as to roll freely.
The hermetic seal closes an end opening of the inner space where the rolling elements are installed between the inner peripheral surface of the outer ring and the outer peripheral surface of the inner ring. The outer peripheral surface of the axial end and the inner peripheral surface of the inner end of the inner ring are fixed to one peripheral surface, and the other end in the radial direction is fixed to the outer peripheral surface of the outer end of the outer ring and the shaft of the inner ring. It is made to slide-contact with the side wall surface provided in the other peripheral surface of the direction end part inner peripheral surface.

  In particular, in the rolling bearing with a sealing device of the present invention, W is the width in the radial direction of the member having the side wall surface of the sliding contact portion between the other radial end portion of the hermetic seal and the side wall surface. D / W <1 is satisfied, where D is the maximum value of the length in the radial direction of the agglomerated material produced at the portion of the side wall surface where the other radial end is in sliding contact. In some cases, this agglutinate does not exist at all. In this case, the maximum value D becomes zero. Further, the “side wall surface” is not limited to the above-described side wall surface constituting the seal groove, and may be a curved surface or a flat surface provided on the member having the other peripheral surface, which is not a cylindrical surface.

  According to the rolling bearing with a sealing device of the present invention configured as described above, the other end in the radial direction of the hermetic seal in the side wall surface provided on the other peripheral surface is in sliding contact during the heat treatment process of the inner ring and the outer ring. Even when an adherent is generated in a portion to be formed, it is difficult to form a gap in a sliding contact portion between the side wall surface and the other end in the radial direction. For this reason, even when used under severe conditions such as rainwater and muddy water falling directly, it can prevent the entry of foreign materials such as rainwater and muddy water from the outside not only when the bearing is rotating but also when it is stationary. . Furthermore, it is possible to prevent leakage of lubricants such as grease and lubricating oil enclosed inside. Further, even when the above-mentioned adhesion occurs, the other end portion in the radial direction of the hermetic seal can be hardly worn, and the life of the bearing can be improved.

Preferably, the rolling bearing with a sealing device described above is used in a state in which it is incorporated in a rotation support portion that rotatably supports a pulley constituting an automobile auxiliary machine with respect to a fixed portion.
In the case of this preferable configuration, it is often used under severe conditions in which foreign matter such as rainwater and muddy water is directly applied. For this reason, the width W in the radial direction of the member having the side wall surface of the sliding contact portion between the radial other end portion of the hermetic seal and the side wall surface, and the length in the radial direction of the adhered material generated on the side wall surface. By regulating the ratio D / W with respect to the maximum value D, the effect obtained by the present invention that the entry of foreign matter from the outside can be prevented becomes remarkable.

  FIG. 1 shows an embodiment of the present invention. The feature of this embodiment is to prevent the entry of foreign matter from the outside even when used under the severe conditions as described above, prevent leakage of the lubricant enclosed inside, and further improve the bearing life. In order to achieve this, the width in the predetermined direction of the sliding contact portion between the front end edge of the sealable seal 2a and the inner side wall surface 16a constituting the seal groove 15 provided on the outer peripheral surface of both end portions of the inner ring 6, and the sliding contact portion It is in the point which controlled the relationship with the dimension of the produced adhesion material. Since the structure of the other rolling bearing parts and the sealing seal 2a is the same as the conventional structure shown in FIGS. 5 to 6 described above, the same parts are denoted by the same reference numerals, and redundant description is omitted or simplified. Hereinafter, the characteristic part of the present invention will be mainly described.

  In the case of the present embodiment, two seal lips 13a and 14 are provided on the inner peripheral edge of each sealable seal 2a, facing the inner space 9 side and the outer space side, respectively. The tip edge of the inner seal lip 13a is slidably contacted with the inner side wall surface 16a constituting the seal groove 15 formed on the outer peripheral surface of both ends of the inner ring 6 over the entire circumference. In particular, in this embodiment, the width of the sliding contact portion between the tip edge of the inner seal lip 13a and the inner side wall surface 16a in the radial direction of the inner ring 6 (vertical direction in FIG. 1) is W. At the same time, D is defined as the maximum value of the length in the radial direction of the inner ring 6 of the agglomerated material generated on the inner side wall surface 16a where the tip edge of the inner seal lip 13a is in sliding contact. When the width W and the maximum value D are defined in this way, the dimensions of each part are regulated so as to satisfy D / W <1. In this way, in order to regulate the ratio D / W of the maximum value D of the length of the adherend to the width W of the sliding contact portion, for example, the following method is adopted. After the heat treatment step when manufacturing the inner ring 6, the side wall surface 16a inside the seal groove 15 is subjected to barrel finishing, honing finishing, turning and grinding, or the side wall surface 16a is sanded and polished with sandpaper or the like. . By adopting such a method, it is possible to reduce the maximum value D of the length of the agglomerated material or to easily remove the agglomerated material. In addition to the above method, the maximum value D of the length of the adhered material can be reduced by performing shot peening treatment on the inner side wall surface 16a of the seal groove 15 or performing water pressure cleaning, brush cleaning, or the like. This agglomerate may be removed.

  According to the rolling bearing with a sealing device of the present embodiment configured as described above, the sealing seal 2a is formed on the inner side wall surface 16a of the seal groove 15 provided on the outer peripheral surface of the inner ring 6 during the heat treatment process of the inner ring 6. Even when an adherent such as a welded product or sludge is generated at a portion where the tip edge of the inner seal lip 13a provided at the inner peripheral edge of the sleeve should be slidably contacted, the sliding contact between the inner side wall surface 16a and the tip edge It is possible to make it difficult to produce a gap in the part. That is, according to the rolling bearing with a sealing device of the present embodiment, the width in the direction along the side wall surface 16a of the portion that is in sliding contact with the inner side wall surface 16a at the front end edge of the inner seal lip 13a is the above-described aggregate. It becomes larger than the length of the kimono in this width direction. For this reason, even when this adherent pushes up the tip edge of the inner seal lip 13a, the gap between at least one of the inner peripheral side and the outer peripheral side of the tip edge and the inner side wall surface 16a. It becomes difficult to form a gap in the surface. For this reason, even when used under severe conditions such as rain water and muddy water falling directly, it is possible to prevent the entry of foreign matter from the outside not only when the bearing is rotating but also when it is stationary. Furthermore, it is possible to prevent leakage of lubricants such as grease and lubricating oil enclosed inside. Further, even when the above-mentioned adhesion occurs, the tip edge of the inner seal lip 13a can be hardly worn, and the bearing life can be improved.

  Further, in the case of the rolling bearing with a sealing device of the present embodiment, a rotation support portion that rotatably supports a pulley constituting a compressor for an air conditioner for an automobile, which is an auxiliary machine for an automobile, with respect to a fixed portion. Use it in the state where it is built in. For this reason, in the case of this example, it is often used under severe conditions in which foreign matter such as rainwater and muddy water falls directly. Therefore, the width W in the radial direction of the inner ring 6 at the sliding contact portion between the tip edge of the inner seal lip 13a and the inner side wall surface 16a of the seal groove 15, and the agglomerates generated on the inner side wall surface 16a. By restricting the ratio D / W of the inner ring 6 with respect to the maximum length D in the radial direction, the effect obtained by the present invention that the intrusion of foreign matter from the outside can be achieved becomes remarkable. .

  Next, the results of experiments conducted to confirm the effects of this example will be described. In this experiment, one having the same structure as the rolling bearing with a sealing device in which the double row ball bearing 1 shown in FIG. 1 is provided with a pair of sealing seals 2a is used. Then, as a pre-stage of this experiment, the size of the adhered matter generated in the portion where the tip edge of the seal lip 13a should be in sliding contact with the side wall surface 16a inside the seal groove 15 provided on the outer peripheral surface of the inner ring 6 is determined in advance. Measurement was made to determine the maximum value D of the length of the adhered material in the radial direction of the inner ring 6. Further, the width W in the radial direction of the inner ring 6 at the sliding contact portion between the inner side wall surface 16a and the inner edge of the inner seal lip 13a provided at the inner peripheral edge of the hermetic seal 2a was obtained. A rolling bearing with a sealing device (product of the present invention) in which the ratio D / W between the maximum value D and the width W is less than 1 (D / W <1), and also 1 or more (D / W ≧ 1) Two kinds of rolling bearings with a sealing device (comparative example) were prepared, and five each were prepared. And each submerged test evaluation was performed by each of this invention product and each comparative example.

The specifications of the double row ball bearing 1 used in this experiment are as follows.
Inner diameter --- 35mm
Outer diameter ---- 52mm
Width --- 20mm
Diameter of each ball ---- 5.556mm
Number of balls --- Two rows of 14 each (total 28)
Note that FIG. 2 shows a representative example of the welded material from the axial direction of the inner ring 6 among the adhered materials adhering to the inner side wall surface 16 a (see FIG. 1) of the inner ring 6. FIG. 3 shows a representative example of sludge, which is copied from the axial direction of the inner ring 6, among the adherents. 2 and 3, the lengths of the inner ring 6 in the radial direction of representative examples of the welded material or sludge are represented as D ₁ and D ₂ . For this reason, when only the welded material and sludge shown in FIGS. 2 and 3 are present as the adhered material at the portion where the tip edge of the inner seal lip 13a is in sliding contact with the side wall surface 16a, D ₁ and D ₂ The larger value is the maximum value D.

The submergence test of this experiment was carried out by rotating each of the present invention products and each of the comparative examples as described above for 2 hours at a rotation speed of 3000 min ^{-1 in} a state where the product was submerged in a water bath having a water depth of 100 mm. It took out from this water tank and measured the amount of water permeation into the inside. FIG. 4 shows the results of an experiment conducted in this way. Further, Table 1 shows the result of comparing the maximum value of the water intrusion amount in each of the products of the present invention and the maximum value of the water intrusion amount in each of the comparative examples.

  As is clear from the experimental results shown in FIG. 4 and Table 1 above, in the case of the product of the present invention belonging to the scope of the present invention in which the D / W is less than 1, the amount of water entering the interior is sufficient. I was able to do less. On the other hand, in the case of the comparative example in which D / W was set to 1 or more and deviated from the scope of the present invention, the amount of water entering the interior increased. From such experimental results, it was confirmed that a good effect can be obtained by the present invention.

  In the case of the above-described embodiment, the width W in the radial direction of the inner ring 6 at the sliding contact portion between the tip edge of the inner seal lip 13a of the sealable seal 2a and the inner side wall surface 16a of the seal groove 15; The case where the ratio D / W of the adhered matter generated on the inner side wall surface 16a with the maximum length D in the radial direction of the inner ring 6 is regulated has been described. However, the present invention is not limited to such a structure. For example, the tip edge of the seal lip provided on the inner peripheral edge of the sealable seal is brought into sliding contact with the side wall surface on the outer side in the axial direction constituting the seal groove. The present invention can also be applied to the structure. In this case, the ratio D / W between the width W of the sliding contact portion in the radial direction of the inner ring and the maximum value D in the radial direction of the inner ring of the adherend formed on the outer side wall surface. To satisfy D / W <1.

The A section expanded cross-section equivalent view of FIG. 6 which shows the Example of this invention. The figure which copied the typical example of the welded material adhering to the side wall surface inside a seal groove. The figure which also copied the representative example of sludge. The graph which shows the experimental result done in order to confirm the effect of an Example. The fragmentary sectional view which shows an example of the conventional structure of a rolling bearing with a sealing device. The B section expanded sectional view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Double row ball bearing 2, 2a Sealing seal 3 Outer ring raceway 4 Outer ring 5 Inner ring raceway 6 Inner ring 7 Ball 8 Cage 9 Internal space 10 Core metal 11 Elastic material 12 Locking groove 13, 13a Inner seal lip 14 Outer seal lip 15 Seal groove 16a, 16b Side wall surface

Claims (1)

An outer ring having an outer ring raceway on the inner peripheral surface, an inner ring having an inner ring raceway on the outer peripheral surface, a plurality of rolling elements provided between the outer ring raceway and the inner ring raceway, and an inner peripheral surface of the outer ring In order to close the end opening of the internal space in which each of these rolling elements is installed between the outer ring and the outer ring of the inner ring, one end in the radial direction is arranged inside the outer end of the outer ring in the axial direction and the end of the inner ring in the axial direction The other end in the radial direction is fixed to the other peripheral surface of the outer peripheral surface of the outer ring in the axial direction and the inner peripheral surface of the inner ring in the axial direction. In a rolling bearing with a sealing device provided with a hermetic seal slidably in contact with a provided side wall surface,
The width of the sliding contact portion between the other radial end portion of the hermetic seal and the side wall surface in the radial direction of the member having the side wall surface is W, and the other radial end portion of the side wall surface is slid. A rolling bearing with a sealing device, wherein D / W <1 is satisfied, where D is the maximum length in the radial direction of the adherend generated at the contact portion.

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