WO2012128054A1 - Roller bearing with filter, and travel device having roller bearing with filter - Google Patents

Abstract

The present invention ensures that a filter does not detach from a seal ring. In this roller bearing with a filter, a rolling element (13) is incorporated between an outer bearing ring (11) and an inner bearing ring (12), a seal ring (20) covers the opening of at least one end of the bearing space, and a filter (23) covering an oil hole (22) formed in the seal ring (20) captures foreign matter included in lubrication oil. The seal ring (20) is formed by insert molding using a core material (30) made of metal and a seal member (40) made of resin or rubber. The core material (30) is provided with an engagement part (30) that fits in the inner bearing ring (12), and a wall part (32) that extends toward the outer bearing ring (11) from the engagement part (31). The seal member (40) is provided with a lip part (41) that is in contact with the outer bearing ring (11). The oil hole (22) is constituted from a through hole (34) provided in the wall part (32), and a reservoir hole (44) provided in the seal member (40) so as to communicate with the through hole (34).

Description

Rolling bearing with filter and traveling device provided with the rolling bearing with filter

The present invention relates to a rolling bearing that is oil-lubricated, and more particularly to a rolling bearing with a filter that is lubricated by oil flowing in through a filter, and further includes an oil-lubricated rolling bearing together with a power transmission mechanism such as a transmission and a reduction gear. The present invention relates to a traveling device provided with a bearing.

Rolling bearings are incorporated in transmissions such as automobiles and various construction machines, power transmission mechanisms such as differentials, reduction gears, and traveling devices including them.
In this type of apparatus, there is a structure in which the rolling bearing is lubricated with oil common to the oil that lubricates the power transmission mechanism.

However, the oil contained in the case of a power transmission mechanism such as a transmission, a differential, and a speed reducer contains a relatively large amount of foreign matter such as gear wear powder (iron powder, etc.). When the foreign matter enters the inside of the rolling bearing, the raceway surface and the rolling surface are peeled off due to the biting of the foreign matter, thereby reducing the durability of the rolling bearing.

For this reason, a rolling bearing with a filter in which a filter is provided in a seal ring attached to the rolling bearing has been proposed in order to prevent the entry of foreign matter. In this rolling bearing with a filter, a filter for capturing foreign matter is attached to an oil passage hole for oil circulation provided in a seal ring (see, for example, Patent Documents 1 and 2).

Also, some traveling devices such as automobiles and various construction machines are provided with a power transmission mechanism such as a transmission and a speed reducer as well as an oil lubricated rolling bearing.

As this type of traveling device, for example, there is a traveling device 4 used in a mining dump truck (construction machine) 1 as shown in FIG. In this mine dump truck 1, a chassis 2 that supports a loading platform and a cab is supported by a plurality of drive wheels (tires) 3. The traveling device 4 transmits power to the drive wheels 3.

As shown in FIG. 7, the traveling device 4 includes a traveling motor 5 that is a drive source and a shaft 6 that is connected to a rotation shaft of the traveling motor 5. A speed reducer is disposed as a power transmission mechanism T on the outer side of the tip portion of the shaft 6.
Further, a spindle 7 that forms a fixed axle is disposed outside the shaft 6. A wheel 9 is disposed outside the spindle 7 via a rolling bearing 10. The rotation of the wheel 9 is transmitted to the drive wheel 3 via the rim 8.

Various configurations are adopted for the speed reducer according to the use and model of the automobile and various construction machines. For example, the traveling device 4 shown in FIG. 7 employs a planetary gear mechanism 50 as a speed reducer. The planetary gear mechanism 50 includes a first planetary gear mechanism 50a and a second planetary gear mechanism 50b, and the rotation of the shaft 6 is decelerated and transmitted to the wheel 9 via the two planetary gear mechanisms 50a and 50b.

The first planetary gear mechanism 50 a includes a first sun gear 51 that rotates integrally with the shaft 6, a plurality of first planetary gears 52 that mesh with the first sun gear 51, and an outer ring gear 53 that meshes with the first planetary gear 52. With. The outer ring gear 53 is connected to a connecting member 53 a that can rotate around the shaft 6.
The second planetary gear mechanism 50 b includes a second sun gear 54 that rotates around the axis as the connecting member 53 a rotates, and a second planetary gear 55 that meshes with the second sun gear 54. The second planetary gear 55 is rotatably supported around the support shaft 56 b of the planet carrier 56 and meshes with an outer ring gear 59 a that rotates integrally with the wheel 9. The planetary carrier 56 has an extension 56 a fixed to the inner peripheral part 7 a of the spindle 7 by spline coupling. Further, between the end surface of the planet carrier 56 and the end surface of the spindle 7, a bearing pressing part (retainer) 17 enters and the gap is maintained.

When the shaft 6 rotates around the axis by driving the traveling motor 5, the first sun gear 51 rotates around the axis by the rotation of the shaft 6. The rotation of the first sun gear 51 causes each first planetary gear 52 to rotate within the outer ring gear 53. As the first planetary gear 52 rotates, the connecting member 53a rotates, and the second sun gear 54 that meshes with the connecting member 53a rotates about its axis.
With the rotation of the second sun gear 54, each second planetary gear 55 rotates around the support shaft 56b of the planet carrier 56, and rotates the wheel 9 via the outer ring gear 9a engaged therewith. The rotation of the wheel 9 is transmitted to the drive wheel 3 via the rim 8, and the mine dump truck 1 travels (see, for example, Patent Documents 3 and 4).

This traveling device 4 employs a pair of single-row tapered roller bearings as the rolling bearing 10 between the spindle 7 and the wheel 9. In this type of construction machine, a tapered roller bearing is often used as the rolling bearing 10 in order to have a structure capable of withstanding a large radial load.

The tapered roller bearing employs a tapered roller as the rolling element 13, and the raceway surface 12a of the inner raceway (inner ring) 12 and the raceway surface 11a of the outer raceway (outer ring) 11 are on either side in the axial direction (FIG. 2). In this case, the distance between the two rows of tapered roller bearings decreases from the outside in the axial direction toward the center between the two rows of tapered roller bearings. Moreover, the preload is given to each rolling element 13 by pressing the inner track 12 with respect to the outer track 11 toward the direction where the distance becomes narrower. This preload is achieved by tightening the bearing retainer part 17 with the bolt 7a with respect to the spindle 7 so that the inner bearing rings 12, 12 are compressed in the axial direction between the bearing retainer part 18 on the opposite side. It can be given by acting.

Furthermore, this kind of traveling device 4 may be provided with a rotation sensor on either side in the axial direction of the rolling bearing 10 as required. The rotation sensor is configured to appropriately detect the rotation direction, rotation speed, rotation angle, rotation acceleration, and the like as necessary, and its output signal is used for rotation control of a rotation shaft such as a motor shaft. .

JP-A-6-323335 JP 2002-250354 A JP 2009-204016 A US Patent Application Publication No. 2004/0065169

In the rolling bearings with a filter described in Patent Documents 1 and 2, it is considered that the filter is fixed to an oil passage hole provided in a seal ring made of resin or rubber by an adhesive or fitting. This is because it is difficult to form an extremely thin mesh member constituting the filter integrally with a resin or the like in the same mold at the same time as the molding of the relatively thick seal ring.

For this reason, when the adhesive part is peeled off or the fitting part is loosened, a part of the fixed part of the filter is detached from the seal ring, or the filter is detached from the seal ring. Sometimes.

One of the causes of such filter dropout is that the seal ring is made of resin or rubber, so the adhesive part and the fitting part of the filter are deformed due to elastic deformation when the seal ring is attached to the rolling bearing. is assumed. It is also assumed that the resin or rubber of the seal ring is deformed by heat or some external force after the seal ring is attached.

¡If the filter falls off, it will be easy for foreign matter to roll and enter the bearing, so the seal ring must be replaced. Replacing the seal ring is an operation that involves at least the disassembly of the power transmission mechanism, and is not always easy. For this reason, it is desirable that the filter has a structure that does not easily fall off.

Also, a method of insert molding a pre-manufactured filter into a seal ring is conceivable so that the filter can be fixed more firmly. If the filter is insert-molded into the seal ring, the outer peripheral portion of the filter is held in a state of being embedded in resin or rubber that is a material of the seal ring. For this reason, the dropout is less likely to occur.

However, when the filter is to be insert-molded into the seal ring, there is a problem of how to fix the filter in the mold during the molding.
The seal ring has a thickness of several millimeters (thickness in the direction connecting the inside and outside of the bearing space in the mounted state), so it must be firmly held in the mold during molding to prevent the filter from moving. It is necessary to keep. This is because if the filter is not held, the filter moves in the thickness direction in the mold, and the embedding in the seal ring becomes incomplete (such as insufficient cover thickness). Incomplete embedding of the filter in the seal ring is not preferable because the filter will drop off.

Further, in the traveling device 4 described above, oil that lubricates the power transmission mechanism T such as a transmission or a speed reducer also flows into the rolling bearing 10 side. That is, the lubricating oil is commonly used on the power transmission mechanism T side and the rolling bearing 10 side.

However, oil that lubricates the power transmission mechanism T such as a transmission or a reduction gear is relatively free of gear wear powder (iron powder or the like) than oil that lubricates a general rolling bearing 10 used alone. The ratio of foreign matters increases.

For this reason, when the oil that lubricates the power transmission mechanism T enters the rolling bearing 10 as it is, the opportunity for foreign matter to enter the rolling bearing 10 also increases. There is no problem within a certain limit that such foreign matter is present in the oil on the power transmission mechanism T side. However, in the rolling bearing 10, when the foreign matter bites into the raceway surface or the rolling surface, the raceway surface or the rolling surface may be damaged such as peeling, scratches, or indentations. For this reason, since durability of the rolling bearing 20 will be reduced, it is not preferable.

Accordingly, the first object of the present invention is to prevent a filter used in a rolling bearing with a filter from falling off the seal ring, and a power transmission mechanism such as a transmission and a reduction gear and a rolling bearing are used in common. In a traveling device that is lubricated with oil, a second problem is to prevent foreign matter from entering the rolling bearing.

In order to solve the above problems, the present invention incorporates a rolling element between an outer race and an inner race, and at least one end of a bearing space formed between the outer race and the inner race. In a rolling bearing with a filter in which an opening is covered with a seal ring and foreign matter contained in lubricating oil is captured by a filter that covers an oil passage hole formed in the seal ring, the seal ring includes a metal core material and A seal member made of resin or rubber is insert-molded, and the core material is a locking portion that fits into one of the outer raceway and the inner raceway, and from the latching portion toward the other. A wall portion that rises, the seal member includes a lip portion that faces or abuts the other side with a gap, and the oil passage hole includes a through hole provided in the wall portion, and the through hole. And a configuration in which a reservoir hole provided in the sealing member such that passage.

According to this configuration, the seal ring is formed by integrating the metal core material and the resin or rubber seal member, and the oil passage hole includes a through hole provided in the wall portion of the metal core material. And a reservoir hole provided in a sealing member made of resin or rubber.
That is, the oil passage hole penetrates the metal core material, and the core material is disposed around the oil passage hole, so that the rigidity in the vicinity of the oil passage hole is enhanced. For this reason, even when the seal ring is attached or detached, the degree of elastic deformation near the oil passage hole is suppressed, and the filter can be prevented from falling off.
Further, since the core material is disposed around the oil passage hole, deformation due to heat after the seal ring is attached can be suppressed in addition to deformation due to external force. This is because metals generally have a lower coefficient of thermal expansion than resins and rubbers. For this reason, even after the seal ring is attached, the degree of thermal expansion and elastic deformation near the oil passage hole can be suppressed, and the filter can be prevented from falling off.

As described above, the oil passage hole may be provided in a rising portion (corresponding to the wall portion of the metal core member) in the direction connecting the outer race and the inner race, among the respective members of the seal ring. Alternatively, or in addition thereto, a member protruding in the axial direction from the rising portion can be provided with respect to the bearing ring on the side opposite to the bearing ring to which the locking portion is fitted.

That is, the configuration is that a rolling element is incorporated between the outer race and the inner race, and at least one end of the bearing space formed between the outer race and the inner race is covered with a seal ring. In the rolling bearing with a filter in which the foreign matter contained in the lubricating oil is captured by the filter covering the oil passage hole formed in the seal ring, the seal ring is a seal made of a metal core material and resin or rubber. The member is insert-molded, and the core material includes a locking portion that fits into one of the outer raceway and the inner raceway, a wall portion that rises from the latching portion toward the other, and A cylindrical portion extending in the axial direction from the wall portion, and the seal member includes a lip portion that faces or contacts the other end with a gap at the tip of the cylindrical portion, and the oil passage hole includes the circular hole. A through hole provided in the parts, a configuration in which a hole reservoir provided in the sealing member so as to communicate with the through hole.

In this configuration, the oil passage hole is a cylindrical member (a cylindrical portion of a metal core material) provided on the side of the seal ring that faces or contacts the outer race or the inner race through the lip portion. Equivalent). The effect of the oil passage hole penetrating the metal core material and the core material disposed around the oil passage hole is the same as that of the above-described configuration.

In these configurations, the filter can be attached to the seal ring by various methods such as an adhesive fixing method or a fitting fixing method. In particular, the filter is insert molded into the seal ring. can do.
If the seal ring is a molded product made of synthetic resin, rubber or the like, and the filter is insert-molded and integrated when the seal ring is molded, a cost-effective seal ring with a filter can be obtained.

In the structure using the insert molding, the filter is in contact with the core material, and the filter is positioned with respect to the seal member when the seal member is molded by the contact. can do.
According to this configuration, since the filter is positioned by the core material when the seal ring is molded, the filter is difficult to move in the mold. For this reason, it is possible to prevent the occurrence of an incomplete embedding state in the seal ring of the filter after the resin or rubber is cured.

At this time, if the locking member for preventing the movement of the filter is provided in the core member at the time of molding the sealing member, the movement of the filter in the mold can be further effectively prevented. .
This locking means is a means for holding the core material and the filter so that they do not move. For example, an adhesive may be used, or the peripheral edge of the filter and the inner peripheral surface of the through hole of the core material And a means for fitting the filter into the through-hole and fixing them.
As other locking means, a protruding piece that rises from the edge of the through hole toward the filter side and meshes with the filter can be employed. The protruding piece may be anything that meshes with the filter mesh or a member provided on the peripheral edge of the mesh. For example, the protruding piece may be a hook shape or a simple linear protruding piece. Moreover, the burr | flash etc. which arose when drilling a through-hole in a core material may be sufficient.

At this time, it is desirable that the filter is in contact with the surface of the core member on the side where the rolling elements are located. Further, the reservoir hole communicating with the through hole of the core member may be provided on both sides of the core member, and the seal member may have the same thickness with the wall portion interposed therebetween. It is desirable that the opposite side is thicker than the side to be used.
This is because according to these configurations, the staying portion where the foreign matter captured by the filter stays can be secured more widely in the space in the pooling hole.

In each of these configurations, the seal ring is formed by fitting the metal core material to one of the outer raceway and the inner raceway via resin or rubber that is a material of a seal member. The structure fixed to the opening of the bearing space can be employed. In addition, the seal ring is configured to be fixed to the opening of the bearing space by fitting the metal core material in a state of directly touching one of the outer race ring and the inner race ring. You can also

The seal ring may be fixed to either the outer race or the inner race, but for example, a configuration in which the seal ring is fitted to the inner race can be adopted. At this time, the lip portion faces the outer raceway with a gap or is in sliding contact. Further, if a configuration in which the seal ring is fitted to the outer race is adopted, the lip portion faces the inner race with a gap or is in sliding contact.

In particular, when the outer bearing ring of the rolling bearing is on the rotating side and the inner bearing ring is on the stationary side, such as a traveling device having a power transmission mechanism used in a large construction machine, the seal ring is the inner bearing ring. It is possible to employ a configuration that is fitted to the. At this time, the lip portion can be configured to be in sliding contact with the outer race. If the seal ring is fixed to the stationary side, scattering of foreign matter captured by the filter can be prevented.

The type of rolling bearing to which this seal ring is attached is free, for example, it may be a tapered roller bearing using a tapered roller as a rolling element, a deep groove ball bearing using a ball as a rolling element, or a cylindrical roller. Cylindrical roller bearings using

When the rolling bearing is a tapered roller bearing, it is possible to adopt a configuration in which the core member is fitted to a large outer diameter surface of the inner race in the tapered roller bearing.
Further, when the rolling bearing is a deep groove ball bearing or a cylindrical roller bearing, the core material is provided on the outer diameter surface of the end of the inner bearing ring or the inner diameter surface of the end of the outer bearing ring. A fitting configuration can be employed.

In order to solve the second problem, the present invention employs a filter-equipped rolling bearing having the above-described configurations in a traveling device in which the power transmission mechanism and the rolling bearing are lubricated with a common lubricating oil. It is.

That is, the configuration includes a drive source, a power transmission mechanism that transmits rotation from the drive source to the drive wheel, and a rolling bearing that supports the drive wheel on an axle on a coaxial line, and the power transmission mechanism and the In a traveling device in which a rolling bearing is lubricated with a common lubricating oil, a filter-equipped rolling bearing having any one of the above-described configurations is used as the rolling bearing, and the rolling bearing is closer to the power transmission mechanism. And an oil flow passage from the power transmission mechanism side to the rolling bearing side, and an opening at one axial end of the bearing space formed between the outer race ring and the inner race ring of the rolling bearing is the circulation A traveling device characterized in that an opening thereof is covered with the seal ring, and a filter integrated with the seal ring captures foreign matters contained in oil passing through the flow passage. It was adopted.

According to this configuration, foreign matter such as wear powder (iron powder, etc.) flowing out of the power transmission mechanism and floating in the lubricating oil is captured by the filter so as not to enter the inside of the rolling bearing. For this reason, it becomes difficult for foreign matter to enter the rolling bearing side. Therefore, the raceway surface and rolling surface of the rolling bearing are not damaged, such as peeling, scratches, and indentations, and the durability of the rolling bearing can be improved and the operation life thereof can be extended.

In general, since the seal ring is detachable between the outer race and the inner race, providing the filter on the seal ring facilitates maintenance of the filter.

Examples of the power transmission mechanism include a transmission, a speed reducer, and a speed increaser. In the case of the speed reducer, in particular, it can be a planetary speed reducer provided with a planetary gear mechanism. In many cases, a planetary speed reducer including a planetary gear mechanism is employed in a construction machine used under severe conditions such as a mining dump truck. Under such severe use conditions, the frequency of foreign matter entering the oil from the gears of the planetary speed reducer is high, so the effect of providing a filter in the oil flow path is higher.

Further, the seal ring has a metal core material and a resin or rubber seal member integrated, and the oil passage hole has a through hole provided in a wall portion of the metal core material, and a resin or rubber. It is comprised with the reservoir hole provided in the seal member made from a metal.
That is, the oil passage hole penetrates the metal core material, and the core material is disposed around the oil passage hole, so that the rigidity in the vicinity of the oil passage hole is enhanced. For this reason, even when the seal ring is attached or detached, the degree of elastic deformation near the oil passage hole is suppressed, and the filter can be prevented from falling off.
Further, since the core material is disposed around the oil passage hole, deformation due to heat after the seal ring is attached can be suppressed in addition to deformation due to external force. This is because metals generally have a lower coefficient of thermal expansion than resins and rubbers. For this reason, even after the seal ring is attached, the degree of thermal expansion and elastic deformation near the oil passage hole can be suppressed, and the filter can be prevented from falling off.

In this configuration, the filter can be attached to the seal ring by using various methods such as an adhesive fixing method or a fitting fixing method. In particular, a configuration in which the filter is insert-molded in the seal ring is employed. For example, in a traveling device in which the power transmission mechanism and the rolling bearing are lubricated with a common lubricating oil, a low-cost seal ring with a filter and a rolling bearing with a filter can be obtained.

In the structure using the insert molding, the filter is in contact with the core material, and the filter is positioned with respect to the seal member when the seal member is molded by the contact. In this case, since the filter is positioned by the core material when the seal ring is molded, the filter is difficult to move in the mold. For this reason, it is possible to prevent the occurrence of an incomplete embedding state in the seal ring of the filter after the resin or rubber is cured.

Further, in the configuration provided with this seal ring, a plurality of the rolling bearings are provided in parallel in the axial direction, and the seal ring is disposed at a position closest to the power transmission mechanism among the plurality of parallel rolling bearings. The structure which covers the said opening by the side of the power transmission mechanism of the rolling bearing made can be employ | adopted.
According to this configuration, when two or more rolling bearings are provided in parallel in the axial direction, the seal ring is disposed at a position closest to the power transmission mechanism. For this reason, when the power transmission mechanism is removed (disassembled) from the traveling device during maintenance of the traveling device, the seal ring is exposed to the outside or is located in an area that is relatively accessible from the outside. It will be. Therefore, it becomes easier to attach and detach the seal ring.

Further, in the configuration, a configuration is adopted in which a rotation sensor is provided on the side opposite to the power transmission mechanism of the rolling bearing arranged at a position farthest from the power transmission mechanism among the plurality of rolling bearings arranged in parallel. be able to.
According to this configuration, the filter is provided on the power transmission mechanism side of the rolling bearing arranged closest to the power transmission mechanism, and the side opposite to the power transmission mechanism of the rolling bearing arranged farthest from the power transmission mechanism side. By fixing the rotation sensor, it is possible to reduce intrusion of foreign matters flowing out from the power transmission mechanism with respect to all the rolling bearings. Further, it is possible to reduce the entry of the foreign matter into the detection unit of the rotation sensor. That is, since no foreign matter adheres to the sensor portion of the rotation sensor, the detection reliability of the sensor can be improved.

Further, in the configuration including both the seal ring and the rotation sensor, the outer race is a rotation side, the inner race is a stationary side, and a rolling bearing disposed at a position closest to the power transmission mechanism. The outer race ring and the outer race ring of the rolling bearing disposed at a position farthest from the power transmission mechanism are processed common parts, and by the processing, one of the common parts is A configuration in which a seal groove for fixing the seal ring and a peripheral groove for fixing the encoder of the rotation sensor are formed on the other side can be adopted. The seal groove and the circumferential groove can be formed by, for example, cutting, grinding, or the like.
According to this configuration, the outer races of the rolling bearings arranged in parallel can be manufactured based on common parts, which can contribute to cost reduction. In terms of preload management, it is preferable that the races of the rolling bearings arranged in parallel are members having the same shape and dimensions as described above at least at the portion where they touch the rolling elements.
If the seal groove and the circumferential groove have the same shape, the outer races of the parallel rolling bearings can be completely shared.

In each of these configurations, the type of the rolling bearing is arbitrary, for example, a tapered roller bearing using a tapered roller as a rolling element, or a deep groove ball bearing using a ball as a rolling element, or a cylinder A cylindrical roller bearing using a roller may be used.

Also, in a configuration in which a plurality of rolling bearings are arranged in parallel, each rolling bearing may be a tapered roller bearing, or may be a deep groove ball bearing or a cylindrical roller bearing.

When tapered roller bearings are used as parallel rolling bearings, the rolling bearings are arranged such that the end surfaces on the small diameter side of the tapered rollers are arranged back to back, and the inner race is pressed in the axial direction so that preload is applied. The given configuration can be adopted.

Moreover, the structure WHEREIN: The said seal groove and the said circumferential groove can each be set as the structure provided in the large diameter side edge part of the internal diameter surface of the said outer race.
That is, when fixing the seal ring and the encoder of the rotation sensor to the outer race of the tapered roller bearing, the outer race is moved further toward the end on the larger diameter side than the contact area (track surface) with the rolling element. It is desirable to expand outward and to be provided at that position. According to this configuration, the inner diameter of the mounting position of the seal ring and the encoder is increased, so that it is easy to secure the mounting space and the mounting work is facilitated.

Moreover, in all the configurations including the filter-equipped seal ring, the seal ring may be fixed to either the outer race ring or the inner race ring. When the race is on the stationary side, a configuration in which the seal ring is fitted to the outer race can be employed.
In other words, the rolling bearings used in various construction machinery undercarriages are often stationary at the inner ring and rotated at the outer ring. In such a case, the seal ring is fitted to the outer race ring on the rotating side. It is desirable to have a combined configuration.

In addition, when this rolling bearing is provided with a rotation sensor, the encoder on the outer race ring side may be a pulsar ring, and the sensor unit on the inner race ring side may be provided with a back magnet type magnetic sensor. Since many rolling bearings used for suspensions of various construction machines have a relatively large diameter, the sensor performance can be stabilized by employing a back magnet type rotation sensor in this way.

Further, in the above-described configuration in which the seal ring is fitted to the outer raceway that is the rotation side, the seal ring includes a latch portion that is latched by the outer race ring, and an inner diameter side from the latch portion. It can be set as the structure provided with the wall part which stands | starts up, and the inner cylindrical part which extends from the wall part and opposes the said inner track ring with a micro gap.
According to this configuration, the lubricating oil flows through a gap having a small interval between the seal ring and the inner race. The foreign matter that can pass through this minute interval is limited to a size that allows entry into the rolling bearing side. In addition, foreign matters are captured by the filter in the oil passage hole of the seal ring, and foreign matters that cause damage to the raceway surface or rolling surface of the rolling bearing can be prevented from entering the rolling bearing side.

In the present invention, the seal ring is integrated with a metal core material and a resin or rubber seal member, and the oil passage hole includes a through hole provided in a wall portion of the metal core material, and a resin or Since it is constituted by the reservoir hole provided in the rubber seal member, the rigidity in the vicinity of the oil passage hole is enhanced and the deformation thereof is suppressed. For this reason, the filter is prevented from falling off when the seal ring is attached or detached. Further, since the degree of thermal expansion and elastic deformation near the oil passage hole is suppressed, the filter can be prevented from falling off after the seal ring is attached.

Furthermore, in a traveling device that lubricates a power transmission mechanism such as a transmission or a reduction gear and a rolling bearing with a common oil, foreign matter that flows out of the power transmission mechanism and floats in the lubricating oil is provided integrally with the seal ring. The filter is captured so as not to enter the inside of the rolling bearing. Therefore, the raceway surface and rolling surface of the rolling bearing are not damaged, such as peeling, scratches, and indentations, and the durability of the rolling bearing can be improved and the operation life thereof can be extended.

The principal part expanded sectional view which shows one Embodiment of this invention (A) (b) is an important section expanded sectional view showing other embodiments of this invention, respectively. Enlarged side view of the main part of the seal ring The principal part expansion longitudinal cross-sectional view which shows one Embodiment of this invention The principal part expansion longitudinal cross-sectional view which shows other embodiment of this invention Longitudinal sectional view of the traveling device of the present invention Longitudinal sectional view of a conventional traveling device Overall view of mine dump truck

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows an enlarged cross-sectional view of a main part of a rolling bearing 10 according to the present invention. 3 shows a seal ring 20 provided in the rolling bearing 10, and FIG. 4 shows an enlarged vertical sectional view of a main part of a portion where the rolling bearing 10 is provided in a double row.

This rolling bearing 10 is incorporated in the traveling device 4 of the mining dump truck (construction machine) 1 shown in FIG. In the mine dump truck 1, a chassis 2 that supports a loading platform and a cab is supported by a plurality of drive wheels (tires) 3. The traveling device 4 transmits power to the drive wheels 3.

As shown in FIG. 6, the traveling device 4 includes a traveling motor 5 that is a drive source and a shaft 6 that is connected to a rotation shaft of the traveling motor 5. A speed reducer is disposed as a power transmission mechanism T on the outer side of the tip portion of the shaft 6.
Further, a spindle 7 that forms a fixed axle is disposed outside the shaft 6. A wheel 9 is arranged outside the spindle 7 via a rolling bearing 10. The rotation of the wheel 9 is transmitted to the drive wheel 3 via the rim 8.

This travel device 4 employs a planetary gear mechanism 50 as a speed reducer. The planetary gear mechanism 50 includes a first planetary gear mechanism 50a and a second planetary gear mechanism 50b, and the rotation of the shaft 6 is decelerated and transmitted to the wheel 9 via the two planetary gear mechanisms 50a and 50b. However, the configuration of the speed reducer is not limited to this example, and a speed reduction mechanism using a planetary gear mechanism having another configuration or a known speed reduction mechanism other than the planetary gear mechanism can be employed.

In this traveling device 4, a double-row tapered roller bearing is adopted as the rolling bearing 10 between the spindle 7 and the wheel 9. The drive wheel 3 is supported on the axle via the double-row tapered roller bearing. In this type of construction machine, a tapered roller bearing is often used as the rolling bearing 10 in order to have a structure capable of withstanding a large radial load.

As shown in FIG. 6, the rolling bearing 10 includes a tapered roller as a rolling element 13 between the raceway surfaces 11 a and 12 a of the outer raceway ring 11 and the inner raceway ring 12. The rolling element 13 is held in the circumferential direction by a cage 14.

The parallel rolling bearings 10 are arranged so that the small diameter side end faces of the tapered rollers are back to back. In other words, the raceway surface 12 a of the inner raceway ring 12 and the raceway surface 11 a of the outer raceway ring 11 go from the axially outer side of the two rows of rolling bearings 10, 10 to the central portion between the two rows of rolling bearings 10, 10. It is provided so that a mutual distance may become narrow toward the side which goes.

Also, preload is applied to each rolling element 13 by pressing the inner race 12 against the outer race 11 toward the direction in which the distance decreases. This preload is caused by tightening the bearing retainer 17 shown in FIG. 4 with a bolt 17a with respect to the spindle 7 so that the inner bearing rings 12 and 12 are in the axial direction between the bearing retainer 18 on the opposite side. It can be applied by applying a compressive force to the.

The power transmission mechanism T and the rolling bearing 10 are lubricated with a common lubricating oil. That is, since the oil is stored up to a certain level in the casing of the traveling device 4, at least the lower part of the power transmission mechanism T and the rolling bearing 10 is immersed in the oil. Thereby, the components of the power transmission mechanism T and the rolling bearing 10 are lubricated.

The inner race 12 is mounted on an axle (spindle 7) that is a non-rotating shaft and cannot rotate. Further, the outer race 11 is mounted so as to rotate integrally with the rotary housing H. The rotary housing H is formed as a member integral with the wheel 9 of the drive wheel 3 or is coupled to the wheel 9 so as to be rotatable.

Further, in the casing, an oil flow path from the power transmission mechanism T side to the rolling bearing 10 side is provided on the side close to the power transmission mechanism T of the rolling bearing 10. That is, since the power transmission mechanism T and the rolling bearing 10 are lubricated with common oil, the oil transmission path between the power transmission mechanism T and the rolling bearing 10 is a mutual passage.
In this embodiment, since the two rolling bearings 10 are provided in parallel in the axial direction, the oil flow path is an opening on the power transmission mechanism T side of the rolling bearing 10 on the side close to the power transmission mechanism T, that is, This is an opening on the side of the power transmission mechanism T in a bearing space formed between the outer race ring 11 and the inner race ring 12. FIG. 1 shows a rolling bearing 10 on the side close to the power transmission mechanism T, and the left side in the figure is an opening on the power transmission mechanism T side.

A seal ring 20 is attached to the rolling bearing 10 on the power transmission mechanism T side. As shown in FIG. 4, the seal ring 20 is attached so as to cover the opening on the power transmission mechanism T side in the bearing space of the rolling bearing 10 on the power transmission mechanism T side.
If necessary, a similar seal ring 20 may be attached to the opening on the opposite side of the power transmission mechanism T in the rolling bearing 10 on the side far from the power transmission mechanism T.

The seal ring 20 is formed by integrating a core material 30 made of metal and a seal member 40 made of resin or rubber by insert molding.

The core member 30 includes a cylindrical locking portion 31 along the outer diameter surface of the inner race ring 12 and a wall portion 32 that rises from the outer edge in the axial direction of the latch portion 31 toward the outer race ring 11 side. Prepare. The seal member 40 includes a rising portion 42 that holds the wall portion 32 of the core member 30 in an embedded state, and a cylindrical lip forming portion 43 that protrudes inward in the axial direction from the outer diameter side edge of the rising portion 42. Prepare. The tip of the lip forming portion 43 is provided with a lip portion 41 that comes into contact with the end surface of the outer race 11.

The seal ring 20 is fixed to the opening of the bearing space by fitting the metal core member 30 in a state in which the metal core member 30 is in direct contact with the inner race 12. In this embodiment, the core member 30 is fitted in a state in which the cylindrical locking portion 31 is in direct contact with the seal groove 12d provided on the inner diameter surface of the large collar 12b of the inner race 12. .

The seal ring 20 is provided with an oil passage hole 22 that penetrates the inside and outside of the bearing space. The oil passage hole 22 includes a through hole 34 provided in the wall portion 32 of the core member 30 and a reservoir hole 44 provided in the seal member 40 so as to communicate with the through hole 34.
The front and back sides of the core member 30 are covered with the seal member 40 so that the reservoir hole 44 is located on both sides of the through hole 34.

As shown in FIG. 3, the oil passage hole 22 is a long hole having an arc shape when viewed from the side. A plurality of arc-shaped oil passage holes 22 are provided at intervals along the circumferential direction of the seal ring 20 so that the arcs are arranged in the direction around the axis. The shape of the oil passage hole 22 may be a shape other than a long hole having an arc shape when viewed from the side, for example, a rectangle or the like.

The filter 23 is attached so as to cover the oil passage hole 22. In this embodiment, the filter 23 is insert-molded simultaneously when the core member 30 and the seal member 40 are insert-molded.

The filter 23 is in contact with the core member 30, and the filter 23 is positioned with respect to the seal member 40 when the seal member 40 is molded.
That is, the filter 23 is positioned by the core member 30 and is difficult to move in the mold at the time of molding. For this reason, after the resin or rubber is cured, it is possible to prevent an incomplete embedding state in the seal ring 20 such as insufficient thickness of the filter 23 on the resin or rubber.

At this time, the filter 23 may be brought into contact with the surface far from the rolling element 13 among the front and back surfaces of the wall portion 32 of the core member 30, but in particular, the staying portion where the foreign matter captured by the filter 23 stays. In order to ensure a wide range, it is desirable that the filter 23 is in contact with a surface close to the rolling element 13, that is, a surface where the rolling element 13 is located.

As the material of the filter 23, various materials such as resin, metal, and non-woven fabric can be adopted. Here, a mesh-like resin having a mesh size of about 0.1 mm to 1 mm is used, but the material and mesh size of the filter 23 can be appropriately set according to the diameter of the foreign matter to be captured.

According to the seal ring 20 with a filter, the metal core member 30 and the resin or rubber seal member 40 are integrated. The oil passage hole 22 flowing from the power transmission mechanism T side to the rolling bearing 10 side includes a through hole 34 provided in the metal core member 30 and a reservoir hole provided in the resin or rubber seal member 40. 44.
That is, the oil passage hole 22 penetrates the metal core member 30 and the core member 30 is disposed around the oil passage hole 22, so that the rigidity in the vicinity of the oil passage hole 22 is enhanced. . For this reason, even when the seal ring 20 is attached to and detached from the rolling bearing 10, the degree of elastic deformation near the oil passage hole 22 is suppressed, and the filter 23 is prevented from falling off.

In general, a metal has a lower thermal expansion coefficient than that of resin or rubber, and the metal is disposed around the oil passage hole 22, so that members near the oil passage hole 22 of the seal ring 20 are subjected to external force. Thermal expansion is also suppressed. For this reason, even after the seal ring 20 is attached to the rolling bearing 10, the degree of thermal expansion and elastic deformation in the vicinity of the oil passage hole 22 is suppressed, and in this respect also, the filter 23 is prevented from falling off.

The operation of the seal ring 20 will be described. During use of the traveling device 4, a part of the oil is directed from the power transmission mechanism T side to the side surface of the rolling bearing 10 as the power transmission mechanism T and the rolling bearing 10 rotate. Scatter.

At this time, since the seal ring 20 is mounted in the opening on the power transmission mechanism T side in the bearing space of the rolling bearing 10, the oil scatters toward the seal ring 20. A part of the oil hitting the seal ring 20 collides with the filter 23 in the oil passage hole 22.

When the oil colliding with the filter 23 passes through the mesh of the filter 23, foreign matters larger than the mesh size of the filter 23 among the foreign matters contained in the oil are captured by the mesh. That is, the filter 23 integrated with the seal ring 20 captures foreign matters contained in oil passing through the opening (the flow passage) at one axial end of the bearing space of the rolling bearing 10. The oil that has passed through the filter 23 flows into the bearing space and lubricates the rolling bearing 10. For this reason, it is possible to prevent foreign matter discharged from the power transmission mechanism T from entering the inside of the rolling bearing 10.

In addition, this embodiment is a rolling bearing 10 in the traveling device 4 used for a large construction machine, the outer race 11 is a rotation side, and the inner race 12 is a stationary side. Further, the seal ring 20 is fixed by fitting to the inner race 12 on the stationary side. For this reason, the filter 23 is stationary, and the foreign matter captured by the filter 23 is not easily scattered. Further, the lip portion 41 is in sliding contact with the end surface of the outer race 11, and entry of foreign matter into the bearing space through the gap is also prevented.

Further, when the filter 23 is clogged with foreign matter, it can be dealt with by replacing the seal ring 20 with a new seal ring 20.

Another embodiment is shown in FIG. In this embodiment, the core member 30 is provided with a locking means 35 for preventing the filter 23 from moving. The locking means 35 is a protruding piece that rises from the edge of the through-hole 34 toward the filter 23 and meshes with the filter 23.
By providing the locking means 35, the movement of the filter 23 in the mold can be more effectively prevented when the seal member 40 is molded.

In the embodiment shown in FIG. 2A, in the oil passage hole 22, the through hole 34 formed in the core member 30 is exposed without being covered with the material of the seal member 40. It has become. As shown in FIG. 1, the inner peripheral surface of the through hole 34 may be covered with the material of the seal member 40. Conversely, in the embodiment shown in FIG. 1, the inner peripheral surface of the through hole 34 may be exposed without being covered with the material of the seal member 40.

Yet another embodiment is shown in FIG. In this embodiment, a core material 30 having a U-shaped cross section is employed instead of the core material 30 having an L-shaped cross section shown in FIG.
The oil passage hole 22 is provided in the lip forming portion 43 in addition to the rising portion 42 (corresponding to the wall portion 32 of the core member 30) of the sealing member 40 among the respective members of the seal ring 20.

The difference from each of the above-described embodiments will be described. The core member 30 includes an engaging portion 31 that fits to the outer diameter surface of the inner race ring 12 and an outer raceway from an outer edge in the axial direction of the engaging portion 31. It has a U-shaped cross section including a wall portion 32 that rises toward the ring 11 side and a cylindrical portion 33 that extends inward in the axial direction from the outer diameter side edge of the wall portion 32.

The sealing member 40 includes a rising portion 42 that holds the wall portion 32 of the core member 30 in an embedded state, and a lip forming portion 43 that protrudes inward in the axial direction from the outer diameter side edge of the rising portion 42. The lip forming portion 43 holds the cylindrical portion 33 of the core material 30 in an embedded state. In addition, a lip portion 41 that abuts against the end surface of the outer race 11 is provided at the tip of the lip forming portion 43. Further, the outer diameter surface of the lip forming portion 43 faces the space between the power transmission mechanism T and the rolling bearing 10.

Also in the seal ring 20 with a filter of this embodiment, the metal core member 30 and the seal member 40 made of resin or rubber are integrated. Further, in each of the rising portion 42 and the lip forming portion 43, an oil passage hole 22 that circulates from the power transmission mechanism T side to the rolling bearing 10 side includes a through hole 34 provided in the metal core member 30, and a resin. Alternatively, it is constituted by a reservoir hole 44 provided in the rubber seal member 40.
The effect obtained by arranging the core member 30 around the oil passage hole 22 is the same as that of the above-described embodiment. The operation of positioning the filter 23 with respect to the core member 30 is the same as that in the above-described embodiment.

In these embodiments, a tapered roller bearing is adopted as the rolling bearing 10, but the rolling bearing 10 is not limited to this. For example, a deep groove ball bearing in which a ball as the rolling element 13 is incorporated between an outer ring as the outer race ring 11 and an inner ring as the inner race ring 12 and the ball is held by a cage may be used. Or the cylindrical roller bearing which incorporated the cylindrical roller as the rolling element 13 between the outer ring | wheel as the outer raceway ring 11 and the inner ring | wheel as the inner raceway ring 12, and hold | maintained the cylindrical roller with the holder | retainer may be sufficient. Further, the rolling bearing 10 interposed between the axle and the drive wheel 3 may be a single row.

In this embodiment, the seal ring 20 has a cylindrical locking portion 31 of the core member 30. However, the locking portion 31 is not limited to a cylindrical shape, and may have other shapes. Further, the locking portion 31 may be fixed to the outer race 11. In particular, when the outer race 11 is stationary and the inner race 12 is rotating, it is desirable to fix the stationary race in this way.

Still another embodiment of the present invention will be described with reference to FIG. FIG. 5 shows an enlarged longitudinal sectional view of a main part of the traveling device 4 according to the present invention. This traveling device 4 is used for the undercarriage of the mining dump truck (construction machine) 1 as in the conventional example. The configuration other than the main part shown in FIG. 5 can be the same as the configuration of FIG. 6 and the like described in the above-described embodiment, and thus the description thereof is partially omitted. The explanation is centered.

As illustrated in FIG. 6 and the like described in the above-described embodiment, the traveling device 4 includes a traveling motor that is a drive source 5, a power transmission mechanism T that transmits rotation from the drive source 5 to the drive wheels 3, and a drive. A rolling bearing 10 that supports the wheel 3 on the axle is provided on a coaxial line. The power transmission mechanism T is a speed reducer including the planetary gear mechanism 50 similar to that of the above-described embodiment.

In the rolling bearing 10, rolling elements 13 are incorporated between the raceway surfaces 11 a and 12 a of the outer raceway ring 11 and the inner raceway ring 12. The rolling element 13 is held in the circumferential direction by a cage 14.
In this embodiment, a tapered roller bearing using a tapered roller is similarly employed as the rolling bearing 10 as the rolling element 13, and two of the tapered rollers are arranged in parallel along the axial direction. The drive wheel 3 is supported on the axle via the double-row tapered roller bearing.

The parallel rolling bearings 10 are arranged so that the small diameter side end faces of the tapered rollers are back to back. In other words, the raceway surface 12 a of the inner raceway ring 12 and the raceway surface 11 a of the outer raceway ring 11 go from the axially outer side of the two rows of rolling bearings 10, 10 to the central portion between the two rows of rolling bearings 10, 10. It is provided so that a mutual distance may become narrow toward the side which goes.

Also, the rolling bearing 10 is preloaded by the inner race 12 being pressed against the outer race 11 in the axial direction. That is, the preload is applied by pressing the inner raceway ring 12 against the outer raceway ring 11 of each rolling bearing 10 in the direction in which the distance between the raceway surfaces 12a and 11a is reduced.

The inner race 12 can be pressed by the bearing retainer part 17 and the bearing retainer part 18 provided on the outer side in the axial direction of the two rows of rolling bearings 10 as in the conventional example.

The inner race 12 is mounted on an axle (spindle 7) that is a non-rotating shaft and cannot rotate. Further, the outer race 11 is mounted so as to rotate integrally with the rotary housing H. The rotary housing H is formed as a member integral with the wheel 9 of the drive wheel 3 or is coupled to the wheel 9 so as to be rotatable integrally (see FIG. 6 for both the spindle 7 and the wheel 9). ).

In the casing, an oil flow path from the power transmission mechanism T side to the rolling bearing 10 side is provided on the side close to the power transmission mechanism T of the rolling bearing 10. The seal ring 20 covering the oil flow passage is attached so as to cover the opening of the bearing space of the rolling bearing 10 on the power transmission mechanism T side. The opening of the bearing space is annular along the raceway surfaces 11a and 12a of the outer raceway ring 11 and the inner raceway ring 12, and the seal ring 20 covering it is also annular.

The seal ring 20 is made of a synthetic resin molded product. The resin seal ring 20 is attached between the large collar 12 b of the inner raceway ring 12 and the large-diameter side end portion of the inner diameter surface of the outer raceway ring 11.
In this embodiment, the outer race ring 11 is on the rotation side, the inner race ring 12 is on the stationary side, and the seal ring 20 is fixed to the outer race ring 11 on the rotation side by fitting.

As shown in FIG. 5, the seal ring 20 includes a locking portion 21 locked to the outer race 11, a wall portion 25 rising from the locking portion 21 toward the inner diameter side, and a wall portion 25. An inner cylindrical portion 27 that extends and faces the outer diameter surface of the inner race 12.
The locking portion 21 has a cylindrical shape, and the cylindrical locking portion 21 is fitted and fixed in a seal groove 11 b provided at the large-diameter end of the inner diameter surface of the outer race 11.

Further, a projecting portion 24 extending in the circumferential direction is formed on the outer diameter surface of the locking portion 21, and the projecting portion 24 is detachably engaged with a circumferential recess 11c formed in the seal groove 11b. If an external force directed outward in the axial direction (on the side of the power transmission mechanism T) is applied to the seal ring 20 attached to the opening of the bearing space, the engagement of the protrusion 24 with the recess 11c is released, and the seal ring 20 Can be removed.

Also, the inner diameter surface of the inner cylindrical portion 27 is slightly larger than the outer diameter surface of the inner race 12 facing it. Since the gap between the opposing surfaces is a minute gap, the passage of oil is allowed through the gap, and the entry of harmful foreign substances into the bearing is prevented.

The seal ring 20 is provided with an oil passage hole 22 penetrating the wall portion 25 in the axial direction. The oil passage hole 22 forms a long hole having an arc shape in a side view. A plurality of arc-shaped oil passage holes 22 are provided at intervals along the circumferential direction of the seal ring 20 so that the arcs are arranged in the direction around the axis.

The filter 23 is attached so as to cover the oil passage hole 22. In this embodiment, the filter 23 is fixed to the surface on the rolling element 13 side of the wall 25 of the seal ring 20 with an adhesive, as shown in FIG. Since the filter 23 is fixed to the surface of the wall portion 25 on the rolling element 13 side, the space in the oil passage hole 22 on the power transmission mechanism T side (planetary gear mechanism 50 side) than the filter 23 is free of foreign matter. It functions as a pool space.

Note that the fixing method of the filter 23 to the seal ring 20 is not limited to fixing with an adhesive, and other fixing methods such as fitting and fixing may be employed. Further, a method of integrating the filter 23 by insert molding into the seal ring 20 may be employed. At this time, the outer peripheral portion of the filter 23 can be embedded and held in the resin of the seal ring 20.

Further, as in the above-described embodiment, the seal ring 20 in which the core member 30 made of metal and the seal member 40 made of resin or rubber are integrated by insert molding can be adopted.

In the case of such an insert-molded seal ring 20, the core member 30 includes a cylindrical locking portion along the inner diameter surface of the outer race ring 11, and the inner race ring 11 side from the axially outer end edge of the latch portion. And a wall portion that rises toward the wall. The seal member 40 includes a rising portion that holds the wall portion of the core member 30 in an embedded state, and a cylindrical lip forming portion that protrudes inward in the axial direction from the outer diameter side edge of the rising portion. A lip portion that abuts against the end surface of the inner race 11 is provided at the tip of the lip forming portion.

In this configuration, the seal ring 20 is fixed to the opening of the bearing space by fitting the metal core member 30 in a state where it directly touches the outer race 11.
The oil passage hole 22 of the seal ring 20 includes a through hole provided in the wall portion of the core member 30 and a pool hole provided in the seal member 40 so as to communicate with the through hole. The reservoir hole is configured such that both the front and back sides of the core member 30 are covered with the seal member 40 so as to be positioned on both sides of the through hole.

Further, the filter 23 is simultaneously fixed so as to cover the oil passage hole 22 when the core member 30 and the seal member 40 are insert-molded. If the filter 23 is in contact with the core member 30, the filter 23 is positioned with respect to the seal member 40 at the time of molding of the seal member 40 by the contact, and the filter 23 after the resin or rubber is cured. Occurrence of an incomplete embedding state in the seal ring 20 such as insufficient covering thickness on the resin or rubber can be prevented.

In any configuration, various materials such as resin, metal, and non-woven fabric can be used as the material of the filter 23. Here, a mesh-like resin having a mesh size of about 1 mm to 3 mm is used, but the material and the mesh size of the filter 23 can be appropriately set according to the diameter of the foreign matter to be captured.

Further, the traveling device 4 is provided with a rotation sensor 60. The rotation sensor 60 is provided at the end of the rolling bearing 10 on the side away from the power transmission mechanism T on the side opposite to the power transmission mechanism T. In the case of a construction machine, the rotation sensor 60 is used for ABS control or traction control, for example, by detecting the rotation speed of the wheel 9.

The rotation sensor 60 fixes a pulsar ring as an encoder 61 to the outer race 11 on the rotation side. Further, a sensor case 64 having a sensor portion 62 made of a back magnet type magnetic sensor is fixed to the inner race 12 which is the stationary side.
Since many rolling bearings used in the suspension of various construction machines have a relatively large diameter, the performance of the sensor can be stabilized by using the rotation sensor 60 as a back magnet type in this way. . However, the rotation sensor 60 is not limited to the back magnet type magnetic sensor, and may be a rotation sensor 60 having another configuration.

The sensor case 64 that houses the sensor unit 62 is fixed to a ring-shaped member 65 that fits on the outer diameter surface of the inner race 12. The sensor case 64 is fixed to the inner race 12 through the ring-shaped member 65.

The ring-shaped member 65 is divided into two parts along the circumferential direction, and is composed of two members having a semicircular shape. The ring-shaped member 65 is fastened and fixed around the inner race 12 by joining both ends of the two semicircular members.
At this time, the circumferential protrusion 65 a provided on the inner diameter surface of the ring-shaped member 65 is fitted and locked in the circumferential groove 12 d provided on the outer diameter surface of the inner race 12.

Also, the input / output line 63 that leads to the circuit board mounted on the sensor unit 62 is drawn out of the rolling bearing 10 from the sensor case 64 through the lead-out hole 66 of the ring-shaped member 65.

The encoder 61 is fixed by being fitted in a circumferential groove 11d formed on the inner diameter surface of the outer race 11. The circumferential groove 11 d is provided at the large-diameter end of the inner diameter surface of the outer race 11.

In this embodiment, the outer race 11, the inner race 12, the tapered roller 13, etc. of the both rolling bearings 10 that are parallel in the axial direction employ common parts.
However, the outer race 11 is processed using common parts. A seal groove 11b for fixing the seal ring 20 is provided at the large-diameter end of the inner diameter surface of one component, and an encoder 61 of the rotation sensor 60 is provided at the large-diameter end of the inner diameter surface of the other component. The peripheral groove 11d for fixing is formed by processing such as cutting.

According to this configuration, since the bearing parts of the rolling bearings 10 arranged in parallel can be made common, it can contribute to cost reduction. In addition, it is desirable that the bearing components of the rolling bearings 10 arranged in parallel are common in this way for preload management.

In addition, since the rotation sensor 60 is disposed at the position farthest from the power transmission mechanism T, even if foreign matter enters the rolling bearing 10, the amount of foreign matter that reaches the rotation sensor 60 can be reduced. For this reason, the performance of the rotation sensor 60 is not hindered.

It should be noted that when the filter 23 is clogged with foreign matter, it can be dealt with by replacing the seal ring 20 with a new seal ring 20.

As in the above-described embodiment, in this embodiment, a tapered roller bearing is adopted as the rolling bearing 10, but the rolling bearing 10 is not limited to this. For example, a deep groove ball bearing in which a ball as the rolling element 13 is incorporated between an outer ring as the outer race ring 11 and an inner ring as the inner race ring 12 and the ball is held by a cage may be used. Or the cylindrical roller bearing which incorporated the cylindrical roller as the rolling element 13 between the outer ring | wheel as the outer raceway ring 11 and the inner ring | wheel as the inner raceway ring 12, and hold | maintained the cylindrical roller with the holder | retainer may be sufficient. Further, the rolling bearing 10 interposed between the axle and the drive wheel 3 may be a single row.

Further, in this embodiment, the seal ring 20 has a cylindrical locking portion 21 fixed to the outer race 11, but the locking portion 21 is not limited to a cylindrical shape, but has other shapes. It is good. Further, the locking portion 21 may be fixed to the inner race 12. This configuration is particularly desirable when the outer race 11 is stationary and the inner race 12 is rotating.

Further, in this embodiment, the seal ring 20 is opposed to either the outer race ring 11 or the inner race ring 12 with a minute gap. You may make it touch both.

1 Construction machinery (dump truck for mining)
2 Chassis 3 Drive wheel (tire)
4 traveling device 5 drive source (traveling motor)
6 Shaft 7 Spindle 8 Rim 9 Wheel 10 Rolling bearing 11 Outer ring (outer raceway ring)
11a Raceway surface 11b Seal groove 11c Recess 11d Circumferential groove 12 Inner ring (inner raceway)
12a Raceway surface 12b Large brim 12c Small brim 13 Tapered roller (rolling element)
14 Cage 20 Seal ring 21 Locking portion 22 Oil passage hole 23 Filter 24 Projection portion 24a Inner projection portion 24b Outer projection portion 25 Wall portion 27 Inner cylindrical portion 30 Core material 31 Locking portion 32 Wall portion 33 Cylindrical portion 34 Through hole 35 Locking means 40 Seal member 41 Lip part 42 Rising part 43 Lip forming part 44 Reservoir hole 50 Planetary gear mechanism 60 Rotation sensor 61 Encoder (Pulsar ring)
62 Sensor part 63 Input / output line 64 Sensor case 65 Ring-shaped member

Claims (16)

1. A rolling element (13) is incorporated between the outer race (11) and the inner race (12), and a bearing space formed between the outer race (11) and the inner race (12) is formed. At least one end opening is covered with a seal ring (20), and a filter (23) covering an oil passage hole (22) formed in the seal ring (20) is used to capture foreign matter contained in the lubricating oil. In rolling bearings,
   The seal ring (20) is formed by insert-molding a core material (30) made of metal and a seal member (40) made of resin or rubber, and the core material (30) is formed by the outer race (11). ) And a locking portion (31) fitted to one of the inner races (12), and a wall portion (32) rising from the locking portion (31) toward the other, the sealing member (40). ) Includes a lip portion (41) that faces or abuts the other side with a gap, and the oil passage hole (22) includes a through hole (34) provided in the wall portion (32) and a through hole (34). 34) A rolling bearing with a filter, characterized in that it is constituted by a pool hole (44) provided in the seal member (40) so as to communicate with 34).
2. A rolling element (13) is incorporated between the outer race (11) and the inner race (12), and a bearing space formed between the outer race (11) and the inner race (12) is formed. At least one end opening is covered with a seal ring (20), and a filter (23) covering an oil passage hole (22) formed in the seal ring (20) is used to capture foreign matter contained in the lubricating oil. In rolling bearings,
   The seal ring (20) is formed by insert-molding a core material (30) made of metal and a seal member (40) made of resin or rubber, and the core material (30) is formed by the outer race (11). ) And a locking part (31) fitted to one of the inner races (12), a wall part (32) rising from the locking part (31) toward the other, and a wall part (32) A cylindrical portion (33) extending in the axial direction, and the seal member (40) includes a lip portion (41) facing or abutting the other end with a gap at the tip of the cylindrical portion (33). The hole (22) includes a through hole (34) provided in the cylindrical portion (33), and a pool hole (44) provided in the seal member (40) so as to communicate with the through hole (34). Rolling bearing with a filter characterized by comprising
3. The rolling bearing with a filter according to claim 1 or 2, wherein the filter (23) is insert-molded in the seal member (40).
4. The filter (23) is in contact with the core member (30), so that the filter (23) is positioned relative to the seal member (40) when the seal member (40) is molded. The rolling bearing with a filter according to any one of claims 1 to 3, wherein the rolling bearing has a filter.
5. The filter according to claim 4, wherein the core member (30) is provided with locking means (35) for preventing the filter (23) from moving when the seal member (40) is molded. Rolling bearing with.
6. The said latching | locking means (35) is a protrusion piece which stands | starts up toward the said filter (23) side from the edge of the said through-hole (34), and meshes | engages with the said filter (23). Rolling bearing with filter.
7. The said filter (23) is contact | abutted to the surface of the side in which the said rolling element (13) is located among the front and back of the said wall part (32). Rolling bearing with filter as described in 1.
8. The pool hole (44) is provided on both sides of the wall portion (32), and the seal member (40) is located on the side where the rolling element (13) is located across the wall portion (32). The rolling bearing with a filter according to claim 7, wherein the opposite side is thick.
9. The said seal ring (20) is fixed to the opening of the said bearing space by the said core material (30) fitting to said one, The one of Claim 1 thru | or 8 characterized by the above-mentioned. Rolling bearing with filter.
10. The outer race (11) is a rotating side, the inner race (12) is stationary, and the core (30) is fitted to the inner race (12). Item 10. A rolling bearing with a filter according to Item 9.
11. The rolling bearing is a tapered roller bearing, and the core material (30) is fitted to a large outer diameter surface (12b) of the inner race (12) of the tapered roller bearing. The rolling bearing with a filter according to claim 10.
12. The rolling bearing is a deep groove ball bearing or a cylindrical roller bearing, and the core (30) is an outer diameter surface of an end of the inner race (12) of the rolling bearing or an end of the outer race (11). The rolling bearing with a filter according to claim 9 or 10, wherein the rolling bearing is fitted to the inner diameter surface of the portion.
13. A drive source (5), a power transmission mechanism (T) for transmitting rotation from the drive source (5) to the drive wheel (3), and a rolling bearing (10) for supporting the drive wheel (3) on the axle. On a coaxial line, and the power transmission mechanism (T) and the rolling bearing (10) are lubricated with a common lubricating oil,
    The rolling bearing with a filter according to any one of claims 1 to 12 is used as the rolling bearing (10), and the power transmission is performed on a side closer to the power transmission mechanism (T) of the rolling bearing (10). An oil flow path from the mechanism (T) side to the rolling bearing (10) side is provided, and is formed between the outer race (11) and the inner race (12) of the rolling bearing (10). An opening at one axial end of the bearing space is the flow passage, and the opening is covered with the seal ring (20), and the filter (23) integrated with the seal ring (20) passes through the flow passage. A traveling device characterized by capturing foreign matter contained in oil.
14. The travel device according to claim 13, wherein the power transmission mechanism (T) is a reduction gear provided with a planetary gear mechanism.
15. A plurality of the rolling bearings (10) are provided in parallel in the axial direction, and the seal ring (20) is located closest to the power transmission mechanism (T) among the plurality of rolling bearings (10) arranged in parallel. The travel device according to claim 13 or 14, characterized in that the opening on the power transmission mechanism (T) side of the rolling bearing (10) arranged is covered.
16. Among the plurality of rolling bearings (10) arranged in parallel, a rotation sensor (T) is provided on the opposite side of the rolling bearing (10) disposed at the position farthest from the power transmission mechanism (T) from the power transmission mechanism (T). 60. The traveling device according to claim 15, further comprising: 60).

Images