JP2018013131A - Bearing with sealing devices - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing with sealing devices, whose handleability is improved in a stage before assembling the sealing devices on the bearing.SOLUTION: The bearing with sealing devices includes a bearing having an inner ring, an outer ring, and rolling elements provided between the inner ring and the outer ring, and the sealing devices provided at the axial ends of the bearing. The sealing devices each have a seal member mounted on the outer ring, and a slinger provided on the bearing outward side of the seal member and mounted on the inner ring. Each of the seal member and the slinger is provided with a plurality of engaging parts which extend a predetermined length in the peripheral direction and overlap with one another in the axial direction in such a manner that the seal member is located on the bearing outward side further than the slinger, and a plurality of engaged parts which are provided between the plurality of engaging parts on one side of each of the seal member and the slinger for storing the plurality of engaging parts on the other side of the counterpart.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a bearing provided with a sealing device suitable for an pulley for an engine accessory, an idler pulley, a tension pulley, etc. used together with, for example, an accessory driving belt or a camshaft driving belt of an automobile.

  Conventionally, a crank pulley fixed to the end of the crankshaft using the rotational power of the engine and a pulley provided in an auxiliary machine such as a compressor used in an air conditioner for automobiles, and the crank pulley and camshaft There is used a mechanism that transmits an endless belt, a timing belt, a chain or the like (hereinafter collectively referred to simply as a “belt”) between a cam pulley fixed to an end portion and transmitting a rotational force. In this torque transmission mechanism, a tension pulley is used to adjust the belt tension, and an idler pulley is used to change the belt travel path.

  FIG. 4 shows an example of a rotational force transmission mechanism described in Patent Document 1. As shown in FIG. A crankshaft pulley 103a is fixed to a crankshaft 103 connected to a piston (not shown) in the engine 101. A belt 111 is used to transmit the rotational force of the crankshaft 103 to the rotating shafts of auxiliary machines such as an alternator 105, an air conditioner compressor 107, and a water pump. That is, an alternator pulley 105a is provided on the rotating shaft of the alternator 105, a compressor pulley 107a is rotatable on the main body of the air conditioner compressor 107 so as to be integrally rotatable with the rotating shaft, and a water pump pulley 109a is integrally rotatable on the rotating shaft of the water pump main body. By providing the belt 111 between the crankshaft pulley 103a and each of the pulleys, the rotational force of the crankshaft 103 is transmitted to each rotating shaft.

  At this time, a tension pulley 113 is provided in order to apply a predetermined tension or more to the belt. Further, depending on the arrangement of the auxiliary machinery, an idler pulley may be used to change the belt travel route.

  In these tension pulley 113 and idler pulley, the rotation shaft is fixed to a cylinder block or the like (vehicle body side member). Therefore, in order to reduce friction loss during pulley rotation between the fixed shaft and the pulley, Rolling bearings may be built inside.

  By the way, the pulley provided in each of these auxiliary machines and the tension pulley 113 and the idler pulley attached to the vehicle body side member collect rain and dust blown from the front when the vehicle travels, and water and muddy water that the tire jumps up from the puddle. Easy to wear. Since such rainwater, dust, muddy water, etc. (hereinafter collectively referred to as “muddy water”) may enter the bearing, it may affect the function of the bearing. The seals 221 and 221 shown in FIG. 5 are provided.

  By providing such a seal, the inside of the bearing is isolated from the outside, and intrusion of muddy water and the like from the outside is prevented during normal traveling. However, when driving in a puddle after heavy rain or after rain has stopped, or when driving on rough roads where the road condition is not always good, the seal is instantaneously elastic because a large amount of muddy water hits the seal. There is a concern that the sealing performance of the seal may be temporarily deteriorated and the muddy water or the like may enter the bearing.

  In order to eliminate such concerns, a configuration has been proposed in which a dust cover 223 is further provided on the outer side in the axial direction of the rolling bearing 203 with seal integrated with the idler pulley 207 as shown in FIG. As shown in the figure, a pair of rubber seals 221 and 221 are attached to the outer ring at both ends of the rolling bearing 203 in the axial direction, and the tip of the seal 221 is brought into contact with a seal groove formed in the inner ring 211. The inside is sealed to prevent intrusion of muddy water from the outside of the bearing. A pair of dust covers 223 and 223 are provided further outside in the axial direction of the seals 221 and 221. The presence of the dust cover 223 can prevent the seal 221 from being deformed by a large amount of muddy water or pebbles directly hitting the seal 221. Further, the dust cover 223 forms a labyrinth with the pulley 207 so as to more reliably eliminate the intrusion of muddy water or the like.

  In the case of the structure shown in FIG. 5, the bearing 203 and the seal are an integral part, but the bearing 203 and the dust cover 223 are separate parts. For this reason, when the pulley 201 with a built-in bearing is attached to a vehicle body or the like, the dust cover 223 needs to be assembled separately from the pulley 201 with a built-in bearing, and at this time, the dust cover 223 has a built-in pulley 201 (bearing 203). It is also necessary to adjust the mutual positional relationship between the pulley 207 and the bearing 203 so as not to hinder the smooth rotation of). For this reason, in order to improve the mounting efficiency of the pulley 201 with a built-in bearing to the vehicle body or the like, it is not necessary to separately install the dust cover 223 or adjust the positional relationship between them when the pulley 201 with a built-in bearing is mounted. A good structure is preferred.

  In order to satisfy such a requirement, a configuration in which a dust cover equivalent member is attached to a bearing has been proposed (for example, Patent Document 3). FIG. 6 shows a pulley 301 with a built-in bearing with a sealing device described in Patent Document 3. FIG. 6A is an overall view and FIG. 6B is an enlarged view of a seal portion. A seal member 321 is attached to the bearing outer ring 313 integrated with the pulley 307, and a slinger 323 as a dust cover equivalent member is attached to the bearing inner ring 311. A sealing device 305 is formed by the seal member 321 and the slinger 323. With such a configuration, it is possible to improve the mounting property of the pulley 301 with a built-in bearing to the vehicle body while performing the sealing function of the bearing 303.

  However, since the sealing member 321 and the slinger 323 described above are separate, when the members 321 and 323 are separated apart during transportation before being assembled into the bearing 303 or during parts stock in the assembly process, Parts management becomes troublesome, and the workability of the installation also decreases. For this reason, it is more preferable that both the members 321 and 323 are handled in an integrated state without damaging the parts.

JP 2006-46392 A JP 2009-174683 A Japanese Patent Laying-Open No. 2015-194172

  In view of the circumstances as described above, it is an object of the present invention to provide a bearing provided with a sealing device that also improves the handleability of the sealing device at the stage before incorporation into the bearing.

In order to achieve the above object, a pulley with a built-in bearing provided with a sealing device according to the present invention is configured as follows.
(1) a bearing having an inner ring, an outer ring, and a rolling element provided between the inner ring and the outer ring;
Sealing devices provided at both axial ends of the bearing;
A bearing with a sealing device having
The sealing device includes a seal member attached to the outer ring, and a slinger provided outside the bearing of the seal member and attached to the inner ring.
Both the seal member and the slinger have a plurality of engagement portions that extend in a predetermined length in the circumferential direction and overlap each other in a mode in which the seal member is positioned on the outer side of the bearing with respect to the slinger in the axial direction, A bearing provided with a sealing device provided with a plurality of engaged portions provided between the plurality of engaging portions on one side of each slinger and capable of accommodating the other engaging portions on the other side.
(2) The bearing provided with the sealing device according to (1), wherein the seal member further includes a second engagement portion positioned inside the bearing relative to the engagement portion of the slinger.

  According to the present invention, the sealing device includes the seal member attached to the outer ring and the slinger attached to the inner ring, and the seal member is positioned on the outer side of the bearing in the axial direction in both the seal member and the slinger. Since the plurality of engaging portions that overlap with each other are provided, the seal member and the slinger are prevented from being separated at the time of conveyance before being attached to the bearing. Thereby, the handleability of the sealing device and the ease of incorporation into the bearing are improved.

It is sectional drawing explaining the pulley with a built-in bearing to which the bearing provided with the sealing device which concerns on 1st Embodiment of this invention was applied. It is a perspective view explaining superposition of a seal member and a slinger. It is sectional drawing explaining the bearing provided with the sealing device which concerns on 2nd Embodiment of this invention. It is a figure which shows an example of the rotational force transmission mechanism of an engine. It is a figure which shows the prior art example of the idler pulley used for a rotational force transmission mechanism. It is a figure which shows another prior art example of an idler pulley.

Embodiments of the present invention will be described below with reference to the drawings as appropriate.
(First embodiment)

  FIGS. 1 and 2 show a pulley with a built-in bearing used as an idler pulley, FIG. 1 is a cross-sectional view of the pulley with a built-in bearing, and FIG. 2 is a diagram for explaining the overlapping of a seal member and a slinger. Is a state before superposition, (b) is a perspective view showing a superposition state. As shown in FIG. 1, a pulley 1 with a built-in bearing according to this embodiment includes a rolling bearing 3 attached to a support shaft attached to a vehicle body, sealing devices 5 provided at both ends in the axial direction of the rolling bearing, and rolling. And a pulley 7 provided integrally with the outside of the bearing 3 and around which a belt is wound.

  The rolling bearing 3 (hereinafter also simply referred to as “bearing”) is a double-row angular contact ball bearing, and includes an inner ring 11 as a stationary-side bearing ring, an outer ring 13 as a rotating-side bearing ring, an inner ring 11 and an outer ring. 13 and a plurality of rolling elements 15 in a double row (two rows) arranged so as to be able to roll, and a pair of cages 17 and 17. When the moment load is not so much, a single row deep groove ball bearing can be used.

  The inner ring 11 is preferably made of bearing steel (eg, SUJ2), and two rows of inner ring raceway grooves 11a are formed on the outer peripheral surface. The inner peripheral surface has a cylindrical shape, and is fixed to the support shaft attached to the above-described vehicle body side member, the rotation shaft of each auxiliary machine, and the main body.

  The outer ring 13 is preferably made of bearing steel (for example, SUJ2), and two rows of outer ring raceway grooves 13a facing the inner ring raceway groove 11a are formed on the inner peripheral surface. A pulley 7 described later is integrally attached to the outer peripheral surface (outer side).

  The balls 15 as rolling elements are preferably made of bearing steel (for example, SUJ2), and are arranged in two rows so as to be able to roll between the outer ring raceway groove 13a and the inner ring raceway groove 11a. Yes. In addition, you may use a roller instead of a ball as a rolling element.

  A pair of cages 17 and 17 are provided to hold the balls 15 at a predetermined interval in the circumferential direction. However, this cage is not essential, and a full ball bearing without a cage may be used when the load applied to the bearing is large.

  The pulley 7 is made of synthetic resin and is manufactured by injection molding. The pulley 7 is generally donut-shaped, and has a base portion 7a extending along the outer peripheral surface of the outer ring 13, an outer peripheral portion 7b arranged radially from the base portion 7a and spanning the belt, and a base. The intermediate part 7c which connects the part 7a and the outer peripheral part 7b is provided. The pulley 7 is integrated with the bearing 3 by disposing the bearing 3 in a molding die and insert-molding synthetic resin on the outside of the bearing 3. Instead of a synthetic resin pulley, a metal pulley or a sintered metal pulley may be used.

  The sealing device 5 is provided with a pair of seal members 21 provided at both ends in the axial direction of the bearing 3 and attached to the outer ring, and a slinger 23 attached to the inner ring 11.

  The seal member 21 includes a core metal 25 on the outer diameter side and an elastic member 27 that is integral with the core metal 25 and includes a seal lip portion 27a on the inner diameter side.

  The core metal 25 is generally T-shaped, and includes a top portion 25a on the outer diameter side, a bent portion 25b bent from the top portion 25a to the inner diameter side, and a straight portion 25c extending from the bent portion 25b to the inner diameter side. And a bent portion 25d bent inward from the straight portion 25c. The outer diameter side of the bent portion 25b is covered with an elastic member 27, and the elastic member 27 is attached to a seal groove formed on the inner peripheral surface of the outer ring, whereby the seal member 21 rotates integrally with the outer ring 13.

  The elastic member 27 includes a seal lip portion 27a that extends to the inner diameter side until it abuts against the inner ring 11, an axial lip portion 27b that extends outward from the inner diameter side of the straight portion 25c of the core metal 25, and a top portion of the core metal 25. A plurality of engaging convex portions 27c as engaging portions (see FIG. 2) extending on the bearing inner diameter side and a predetermined length in the circumferential direction on the 25a side are provided between the plurality of engaging convex portions 27c. A concave portion 27d as an engaged portion that can accommodate the engaging convex portion 23c of the slinger and a stock projection 27e extending inwardly from the bent portion 25b of the core metal 25 are provided.

  The slinger 23 is preferably made of metal and is provided on the outer side in the axial direction of the seal member 21. The slinger 23 includes a cylindrical portion 23a that is press-fitted into the inner ring 11, an annular flange portion 23b that extends almost straight outward from the cylindrical portion 23a, and an outer diameter side of the flange portion 23b on the outer side of the bearing. A plurality of engaging convex portions 23c (see FIG. 2) as engaging portions extending on the radial side and over a predetermined length in the circumferential direction, and the sealing member provided between the plurality of engaging convex portions 23c and described above And a concave portion 23d as an engaged portion capable of accommodating 21 engaging convex portions 27c. The flange portion 23b is in contact with the axial lip portion 27b of the elastic member 27 to prevent intrusion of water or the like from the outside.

  Further, when the engaging convex portion 23c of the slinger 23 is incorporated in the bearing, the engaging convex portion 27c of the sealing member 21 and the engaging convex portion 23c of the slinger 23 are overlapped with each other in such a manner that the engaging convex portion 23c is outward of the bearing. Yes. As described above, the engagement protrusions 23c of the slinger 23 are overlapped with each other so that they are inward of the bearing rather than the engagement protrusions 27c of the seal member 21, so that the seal member 21 and the slinger 23 are once overlapped. And even if it receives the force of the XX direction in FIG. 2 before incorporating in the bearing 3, both the members 21 and 23 become difficult to isolate | separate.

  Here, with reference to FIG. 2, a method of superposing the seal member 21 and the slinger 23 on each other will be described. First, as shown in FIG. 2A, the circumferential phases of both the members 21 and 23 are matched so that the engaging convex portion 23c of the slinger 23 opposes the concave portion 27d of the sealing member 21. In this state, the two members 21 and 23 are moved in the axial direction toward each other (in FIG. 2A, the slinger 23 is moved in the A direction), and the engagement convex portion 23c of the slinger 23 is formed into the concave portion of the seal member 21. 27d. At this time, the engaging convex portion 27 c of the seal member 21 is accommodated in the concave portion 23 d provided in the slinger 23. Then, after the slinger 23 is moved in the A direction to a position where the engagement convex portion 23c of the slinger 23 is inward of the bearing rather than the engagement convex portion 27c of the seal member 21, in this state, the seal member 21 is moved to the arrow B. Rotate about 90 degrees in the direction. As a result, the engaging convex portion 23c of the slinger 23 slips below the engaging convex portion 27c of the seal member 21, and the engaging convex portion 27c of the seal member 21 is outside the bearing than the engaging convex portion 23c of the slinger 23. Overlap each other in a different manner.

  Next, the operation of the above-described bearing will be described.

  When the vehicle travels, the rotational force is transmitted from the crankshaft of the engine to the pulleys, tension pulleys, and idler pulleys provided in each auxiliary machine via a belt that is stretched. These pulleys have a built-in bearing provided with a sealing device to prevent intrusion of muddy water and pebbles from the outside.

  In the present embodiment, the sealing device 5 includes the seal member 21 and the slinger 23, and the engagement convex portion 27 c of the seal member 21 is located on the outer side of the bearing than the engagement convex portion 23 c of the slinger 23. By overlapping each other, the seal member 21 and the slinger 23 are difficult to separate before being incorporated into the bearing 3. Thereby, the handleability of the sealing device can be improved at the time of conveyance before the assembly into the bearing 3 and at the time of supply to the assembly process.

  In addition, the stock protrusion 27e of the seal member 21 described above is placed horizontally and transported when the seal member 21 and the slinger 23 are combined and transported or in the process of assembling into the bearing 3 and stocked. In this case, a predetermined gap is secured by abutting with the straight portion 23b of the adjacent slinger 23. By providing the stock projection 27e, it is possible to prevent the seal member 21 from being deformed in a state where the stock projection 27e is horizontally stacked and stocked.

As described above, according to the bearing 3 provided with the sealing device 5 of the present embodiment, it is possible to improve the handleability at the stage before the sealing device 5 is incorporated into the bearing 3.
(Second Embodiment)

  Next, a second embodiment will be described with reference to FIG. The present embodiment is different from the first embodiment in that the second engagement convex portion 27f is provided on the seal member 21 '. That is, in the present embodiment, the seal member 21 ′ is provided with the second engagement convex portion 27 f further on the bearing inward side of the engagement convex portion 23 d of the slinger 23. With this configuration, when the sealing device is placed horizontally and transported, the engaging convex portion 23d of the slinger 23 comes into contact with the second engaging convex portion 27f of the seal member 21 ′, thereby It is possible to prevent the members 21 'and 23 from coming into close contact with each other and the axial lip 27b from being deformed.

  Further, by forming a labyrinth between the engaging convex portion 23c of the slinger 23 and the engaging convex portion 27c and the second engaging convex portion 27f of the seal member 21 ′, muddy water from the outside passing through the labyrinth, etc. Intrusion into the bearing can be limited. It should be noted that the same effect as that of the first embodiment can also be obtained by this embodiment.

  In addition, this invention is not limited to what was illustrated to the said embodiment, In the range which does not deviate from the summary of this invention, it can change suitably. For example, although the example which incorporated the bearing provided with the sealing apparatus in the idler pulley was demonstrated, the bearing provided with the sealing apparatus can also be used for the pulley provided in tension pulleys and accessories other than an idler pulley.

3 Bearing 5 Sealing device 11 Inner ring 13 Outer ring 15 Rolling element 21 Seal member 23 Slinger 23c, 27c Engagement convex part 23d, 27d Concave part 27f Second engagement convex part

Claims (2)

A bearing having an inner ring, an outer ring, and a rolling element provided between the inner ring and the outer ring;
Sealing devices provided at both axial ends of the bearing;
A bearing with a sealing device having
The sealing device includes a seal member attached to the outer ring, and a slinger provided outside the bearing of the seal member and attached to the inner ring.
Both the seal member and the slinger have a plurality of engagement portions that extend in a predetermined length in the circumferential direction and overlap each other in a mode in which the seal member is positioned on the outer side of the bearing with respect to the slinger in the axial direction, And a plurality of engaged portions provided between the plurality of engaging portions on one side of the slinger and capable of accommodating the other engaging portions on the other side. Bearings. 2. The bearing provided with the sealing device according to claim 1, wherein the seal member further includes a second engagement portion located inside the bearing relative to the engagement portion of the slinger.

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