JP2015052349A - Conical roller bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent seizure of a conical roller bearing even when the amount of a lubricant is small.SOLUTION: A conical roller bearing includes an inner ring 2, an outer ring 4, a plurality of conical rollers 6, and a cage 8. A shield 10 for capturing a lubricant flowing in from a back side of the outer ring 4 and flowing out to a front side, is mounted at the front side of the outer ring 4, and a mounting region of the shield 10 is positioned at an outer diameter side of the outer ring 4, thus the lubricant flowing in from the back side of the outer ring 4 and flowing out from the front side is received and an oil reservoir is formed to supply the lubricant from the oil reservoir even when the amount of lubricant flowing out in use is reduced, and the bearing can be lubricated.

Description

  The present invention relates to a tapered roller bearing.

  A tapered roller bearing is a radial bearing using a tapered roller as a rolling element, and the tapered roller has a truncated cone-shaped raceway surface formed on the outer periphery of the inner ring and a truncated cone-shaped raceway surface formed on the inner periphery of the outer ring. Between. Therefore, when the tapered roller bearing rotates, the lubricating oil moves toward the outer ring due to the centrifugal force caused by the rotation of the inner ring, and due to the shape of the raceway of the outer ring, the smaller diameter side of the raceway of the outer ring Lubricating oil flows from the large diameter side to the large diameter side. As a result, the lubricating oil flows axially through the bearing.

  Here, the front surface of the bearing ring refers to the side surface of the bearing ring that does not support the axial load, and the rear surface of the bearing ring refers to the side surface of the bearing ring that supports the axial load. Therefore, in the case of a tapered roller bearing, the lubricating oil moves from the back side to the front side of the outer ring.

  Patent Document 1 (Japanese Utility Model Publication No. 62-18739) discloses a tapered roller bearing with a seal in which a metal ring is attached to an inner diameter of an end of an outer ring.

Japanese Utility Model Publication No. 62-18739

  As described above, in the tapered roller bearing, due to the cross-sectional shape, the lubricating oil flows in from the back side of the outer ring and flows out from the front side. The lubricating oil once flowing out from the front side does not circulate inside the bearing, so that depending on the arrangement of the bearing, the amount of oil inside the bearing decreases, and seizure of the bearing may occur. Therefore, seizure due to poor lubrication may occur unless the operating environment allows the lubricating oil to always flow into and out of the bearing. Tapered roller bearings cannot be used in environments where the conditions for using tapered roller bearings for the mating parts are severe and the amount of lubricating oil is small, so the design of the mating parts must be changed.

  When the metal ring is press-fitted into the inner diameter of the outer ring as in Patent Document 1, the accuracy of the inner diameter of the outer ring (grinding finish) is required, so that the number of processing steps increases. In addition, since there is a track on the inner circumference of the outer ring, it is necessary to provide a portion for press-fitting the metal ring outside the track, and the axial length of the outer ring must be extended. This is because the axial dimension of the track cannot be shortened in order to ensure a predetermined load capacity. Further, when the axial length of the outer ring is extended, the position of the front surface of the outer ring is changed, which affects the mating with the counterpart part, and the design of the counterpart part must be changed from this aspect. For example, in the case of a tapered roller bearing for a transmission, since the mating part is a component of the transmission, the design change is not easy.

  An object of the present invention is to provide a tapered roller bearing that does not cause seizure even when the amount of lubricating oil is small, without sacrificing the bearing load capacity and without extending the axial length of the outer ring. It is in.

  In this invention, a shield is attached to the outer diameter side of the front surface of the outer ring, the lubricating oil that is about to flow out from the front side of the outer ring is captured to form a lubricating oil pool, and the lubricating oil is supplied from the lubricating oil pool to the inside of the bearing. The problem was solved by returning it.

  That is, the tapered roller bearing according to the present invention includes an inner ring having a raceway on an outer periphery, an outer ring having a raceway on an inner circumference, a plurality of tapered rollers disposed between the raceway of the inner ring and the raceway of the outer ring, and the tapered roller. A cage for holding the rollers at a predetermined interval in the circumferential direction is provided, and on the front side of the outer ring, a shield for capturing lubricating oil flowing in from the back side of the outer ring and flowing out to the front side is attached, And the mounting part of the said shield was made into the outer-diameter side of the said outer ring | wheel.

By mounting the shield on the front side of the outer ring, the lubricant that flows in from the back side of the outer ring and flows out to the front side is received by the shield, and the outflow of the lubricating oil is kept to a fixed amount. As a result, an oil pool is formed, and the lubricating oil is replenished from the oil pool formed by the shield even if the amount of lubricating oil inside the bearing decreases during use.
In addition, the front side of the outer ring usually does not serve as an abutting surface with the counterpart part. Even in the case of the abutting surface, it is not necessary to change the axial length of the outer ring as compared with the case where a metal ring is press-fitted into the inner diameter of the outer ring as in Patent Document 1, so that it is not necessary to change the design of the counterpart part. .

  According to the present invention, the following effects can be obtained. That is, the lubricating oil that flows in from the back side of the outer ring and flows out to the front side is received by the shield and an oil pool is formed, so that seizure of the tapered roller bearing can be suppressed, and a small amount compared to the conventional product. The tapered roller bearing can be used even in an environment where lubricating oil is used.

  Moreover, the following effect is acquired by making the mounting | wearing site | part of a shield into the front side of an outer ring | wheel, and the outer diameter side. In other words, since the front side of the outer ring is the side that does not support the axial load, it usually does not serve as an abutting surface against the mating part, and if it is on the outer diameter side, it does not affect the track, so a shield is attached. Therefore, it is possible to easily process a step or the like. Accordingly, the degree of freedom in design of the inner diameter of the outer ring is improved, the useless extension of the axial dimension due to the shield attachment is avoided, and the load capacity can be set freely. There is no need to change the design of the mating parts. Further, by providing the mounting portion in the form of a groove, for example, or by inclining the groove, the structure is less likely to come off even if the fitting tolerance is somewhat loose due to processing accuracy, quenching deformation, or the like.

It is sectional drawing of the tapered roller bearing for demonstrating embodiment. It is the elements on larger scale which show embodiment which provided the inclination part in the inner peripheral edge of the shield. It is the elements on larger scale which show embodiment which crimped the outer periphery edge of the shield. It is the elements on larger scale which show embodiment which inclined the small diameter edge part of the outer ring | wheel in FIG. 1, and the outer peripheral edge of a shield. It is a partial enlarged view which shows embodiment replaced with a small diameter edge part and made it the annular groove. It is the elements on larger scale which show embodiment which inclined the annular groove of the outer ring | wheel in FIG. 5, and the outer peripheral edge of a shield. It is the elements on larger scale which show embodiment which inclined the outer peripheral surface of the big collar of an inner ring.

  Embodiments of the present invention will be described below with reference to the drawings.

  As shown in FIG. 1, the tapered roller bearing includes an inner ring 2, an outer ring 4, a tapered roller 6, and a cage 8, and a shield 10 is attached to the outer ring 4.

The inner ring 2 fits the inner peripheral surface 2a with a shaft (not shown). A conical surface track 2b is formed on the outer periphery of the inner ring 2, and a large brim 2c and a small brim 2d are formed on both sides of the track 2b. The inner ring 2 has a front side on the left side and a back side on the right side.

The outer ring 4 fits the outer peripheral surface 4a with a hole of a housing (not shown). A conical surface track 4 b is formed on the inner periphery of the outer ring 4. The outer ring 4 has a front side on the right side and a back side on the left side.

The tapered roller 6 has a conical rolling surface 6a, an end surface on the large diameter side, that is, a large end surface 6b, and an end surface on the small diameter side, that is, a small end surface 6c. The track 2b of the inner ring 2 and the track 4b of the outer ring 4 Intervene between.

During the bearing operation, the tapered roller 6 rolls on the raceways 2b and 4b with its rolling surface 6a. Based on the geometric cross-sectional shape of the tapered roller bearing, the tapered roller 6 is pushed toward the large end surface 6b, and the large end surface 6b and the large collar 2c of the inner ring 2 are in sliding contact. When the bearing is stopped, even if the tapered roller 6 falls to the small diameter side of the raceway 2b of the inner ring 2, the small end surface 6c is received by the small collar 2d of the inner ring 2. Further, at the time of assembly, the tapered roller 6 is moved in the axial direction from the small collar 2d side of the inner ring 2 so as to get over the small collar 2d and disposed on the track 2b.

The cage 8 is between the inner ring 2 and the outer ring 4 and plays a role of holding a plurality of tapered rollers 6 at a predetermined interval in the circumferential direction. The large-diameter-side annular portion 8a, the small-diameter-side annular portion 8b, and a plurality of pillar portions 8c that connect the large-diameter-side annular portion 8a and the small-diameter-side annular portion 8b, and a trapezoidal shape between the adjacent pillar portions 8c. A pocket 8d is formed, and the tapered roller 6 is accommodated in each pocket 8d.

The shield 10 is attached to the front side of the outer ring 4. This is to receive the lubricating oil flowing into the bearing from the back side of the outer ring 4 and flowing out from the front side of the outer ring 4. Further, since the lubricating oil tends to flow along the raceway 4b of the outer ring 4 due to the centrifugal force caused by the rotation of the inner ring 2, the tapered roller 6, and the cage 8, the shield 10 is attached to the outer ring 4. .

The shield 10 can be made of synthetic resin or steel plate or other metal. Since synthetic resin is lightweight, it is a preferable material from the viewpoint of reducing the weight of the bearing. In the case of the shield 10 made of steel plate, it can be fixed by welding to the outer ring 4.

In the case of FIG. 1, a small diameter step is formed at the front end of the outer ring 4. Further, the shield 10 has an inverted L-shaped cross section, and has a disk portion 12 and an outer peripheral edge 14, and the disk portion 12 and the outer peripheral edge 14 form a right angle. The outer peripheral edge 14 of the shield 10 is fitted to the outer peripheral surface 4 c of the small diameter end portion of the outer ring 4. The inner peripheral edge of the disk portion 12 of the shield 10 extends further to the inner diameter side beyond the raceway 4b of the outer ring 4 when viewed in the bearing radial direction, and the large diameter side annular portion 8a of the cage 8 and the inner ring 2 are large. It is located near the middle of the collar 2c.

In this case, the outer peripheral surface 4c of the small-diameter stepped portion only needs to have a diameter that is as small as the thickness of the shield 10 from the outer diameter of the outer ring 4, so that waste of material can be minimized. In the drawing, the diameter difference between the outer ring 4 and the outer peripheral surface 4c of the small-diameter stepped portion is greatly exaggerated. Regarding the axial dimension of the outer ring 4, it is only necessary to provide a small-diameter step portion when it is not the abutting surface with the mating member, and when it becomes the abutting surface, the end surface of the outer ring 4 can be cut by the thickness of the shield 10. Therefore, there is no need to extend the axial dimension. Further, the outer peripheral surface 4c and the side wall surface of the shield mounting portion, specifically, the small-diameter stepped portion may be a forged surface or a turning surface, and by making the outer peripheral surface of the outer ring 4 and the raceway surface 4a non-processed after quenching. Low cost.

  FIG. 2 shows an example in which the inclined portion 16 is formed by bending the inner peripheral edge of the shield 10 obliquely toward the inside of the bearing. The inclined portion 16 exists over the entire circumference, and the raceway 4b of the outer ring 4, the disc portion 12 of the shield 10, and the inclined portion 16 form an annular space where the bearing inner side is open. This space becomes a pool of lubricant.

FIG. 3 shows an example in which a thinning 4 d is provided at the corner of the small diameter step portion of the outer ring 4 and the tip of the outer peripheral edge 14 of the shield 10 is caulked. Thereby, the retaining action is obtained.
As shown in FIG. 3, when the protrusion is provided by caulking the tip of the outer peripheral edge 14, the outer peripheral surface 4 c of the small diameter step portion of the outer ring 4 can be turned. Further, when the shield 10 formed in the shape as shown in FIG. 3 is attached to the outer ring 4, it is snap-fitting using the elastic deformation of the tip protrusion of the outer peripheral edge 14, and this deformation is caused by the processing stress of the protrusion. Since the direction is weakened, the stress load on the material can be reduced. As a result, the plastic deformation of the shield 10 is alleviated. As a result, the degree of freedom in designing the material, the plate thickness, and the fixed portion shape is improved.

  4 shows that the outer peripheral surface 4c of the small-diameter step portion of the outer ring 4 is an inclined surface having a larger diameter toward the end surface side (right side in FIG. 4) of the outer ring 4, and the outer peripheral edge 14 of the shield 10 is similarly inclined. This is an example. Thereby, the retaining action is obtained. In this case, the shield 10 having the shape shown in FIG. 1 is used, and the outer peripheral edge 14 is caulked in a state where the disc portion 12 is in contact with the end face of the outer ring 4 to obtain the state shown in FIG.

  FIG. 5 shows an example in which an annular groove 4e is formed in place of the small-diameter step portion of the outer ring 4, and the outer peripheral edge 14 of the shield 10 is inserted into the annular groove 4e.

  As shown in FIG. 6, the annular groove 4 e and the outer peripheral edge 14 of the shield 10 may be inclined. Thereby, the retaining action is obtained as in the case of FIG.

  As shown in FIG. 7, the outer peripheral surface 2 d of the large collar 2 c of the inner ring 2 may be an inclined surface that gradually increases in diameter from the front side to the back side of the inner ring 2. Thereby, the lubricating oil on the large brim 2c can be returned to the tapered roller 6 side. Specifically, the lubricating oil is guided to the rolling contact portion between the rolling surface 6a of the tapered roller 6 and the raceways 2b and 4b, and the sliding contact portion between the large end surface 6b of the tapered roller 6 and the large collar 2c. it can.

  The above-described operation of the embodiment shown in FIG. 7 is more effectively exhibited when implemented in combination with the embodiment shown in FIG. That is, the lubricating oil flowing out from the front side of the outer ring 4 is received by the shield 10 and returned toward the large collar 2c of the inner ring 2 by the inclined portion 16, whereby the outer peripheral surface 2d of the large collar 2c is further inclined. Thus, it can be reliably reused for tapered roller bearing lubrication.

  The effects of the above-described embodiment are summarized as follows.

  In a tapered roller bearing having an inner ring 2, an outer ring 4, a plurality of tapered rollers 6, and a cage 8, lubricating oil that flows from the back side of the outer ring 4 to the front side of the outer ring 4 and flows out to the front side. By mounting the shield 10 for catching, the lubricating oil flowing in from the back side of the outer ring 4 and flowing out from the front side is received to form an oil pool, and the amount of lubricating oil flowing out during use is reduced. However, the lubricating oil is replenished from the oil pool, and the bearing can be lubricated. Moreover, since the shield 10 is mounted on the front side of the outer ring 4 that does not serve as an abutting surface with the mating part, it is not necessary to change the design of the mating part.

The shield 10 has an L-shaped cross section, and includes a disc portion 12 extending perpendicularly to the axis of the outer ring 4 and an outer peripheral edge 14 of the disc portion 12, and a small-diameter step portion is formed at the end of the outer ring 4. Ten outer peripheral edges 14 are fitted to the outer peripheral surface 4c of the small diameter step portion. In this case, the outer peripheral surface 4c of the small-diameter stepped portion is an inclined surface having a larger diameter toward the end surface side, and the outer peripheral edge 14 of the shield 10 is bent at an acute angle, thereby making it difficult for the shield 10 to come off.

The shield 10 has an L-shaped cross section, and includes a disk part 12 extending perpendicularly to the axis of the outer ring 4 and an outer peripheral edge 14 of the disk part 12, and an annular groove 4 e is formed on the end surface of the outer ring 4. Is inserted into the annular groove 4 e of the outer ring 4. In this case, the annular groove 4e of the outer ring 4 is an inclined surface having a larger diameter toward the end surface side, and the outer peripheral edge 14 of the shield 10 is bent at an acute angle, thereby making it difficult for the shield 10 to come off.

The shield 10 may be made of resin. Resin materials are not only suitable for mass production, but they are lightweight, so they do not go against the weight reduction of bearings.

The shield 10 may be made of a steel plate. In that case, it is also possible to securely fix the outer ring 4 by welding.

By making the outer peripheral surface 2d of the large collar 2c of the inner ring 2 into an inclined surface having a larger diameter toward the end of the inner ring 2, the lubricating oil on the large collar 2c of the inner ring 2 can be used for the rolling contact portion or sliding of the tapered roller. It can be returned to the contact portion.

  By bending the inner peripheral edge of the flat plate portion 10a of the shield 10 toward the tapered roller 6, the lubricating oil received by the shield 10 can be returned to the rolling contact portion or the sliding contact portion of the tapered roller.

  While the embodiments of the present invention have been described with reference to the drawings, the present invention can be implemented with various modifications without departing from the scope of the claims. For example, the embodiment of FIG. 2 can be implemented in combination with the embodiments of FIGS. 1 and 3 to 7. Further, the embodiment of FIG. 7 can be implemented in combination with the embodiment shown in any of the other drawings.

2 Inner ring 2a Inner circumferential surface 2b Track 2c Large brim 2d Small brim 4 Outer ring 4a Outer circumferential surface 4b Track 4c Small diameter step 4d Nuts 4e Annular groove 6 Tapered roller 6a Rolling surface 6b Large end surface 6c Small end surface 8 Cage 8a Small diameter ring Part 8b Large-diameter side annular part 8c Column part 8d Pocket 10 Shield 12 Disc part 14 Outer peripheral edge 16 Inclined part

Claims (7)

  An inner ring having a track on the outer periphery, an outer ring having a track on the inner periphery, a plurality of tapered rollers disposed between the track of the inner ring and the track of the outer ring, and the tapered rollers are held at predetermined intervals in the circumferential direction. And a shield for capturing lubricating oil that flows in from the back side of the outer ring and flows out to the front side is mounted on the front side of the outer ring. Tapered roller bearing on the outer diameter side. The shield has an inverted L-shaped cross section, and includes a disc portion extending perpendicularly to the axis of the outer ring and an outer peripheral edge of the disc portion, and a small-diameter step portion is formed at the end of the outer ring, The tapered roller bearing according to claim 1, wherein the outer peripheral edge is fitted to the outer peripheral surface of the small diameter step portion. The tapered roller bearing according to claim 2, wherein an outer peripheral surface of the small diameter step portion is an inclined surface having a larger diameter toward an end surface side of the outer ring, and the outer peripheral edge of the shield is bent at an acute angle. The shield has an inverted L-shaped cross section, and includes a disc portion extending perpendicularly to the axis of the outer ring and an outer peripheral edge of the disc portion, and an annular groove is formed on an end surface of the outer ring, and the outer peripheral edge The tapered roller bearing according to claim 1, wherein is inserted into the annular groove. The tapered roller bearing according to claim 4, wherein the annular groove is an inclined surface having a larger diameter toward the end surface side of the outer ring, and the outer peripheral edge of the shield is bent at an acute angle. The tapered roller bearing according to any one of claims 1 to 5, wherein an outer peripheral surface of a large brim of the inner ring is an inclined surface having a larger diameter toward an end side of the inner ring. The tapered roller bearing according to any one of claims 1 to 6, wherein an inner peripheral edge of the shield is bent toward a rolling surface of the tapered roller.

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