JP2013015200A - Conical roller bearing - Google Patents

Abstract

An object of the present invention is to increase the load that a tapered roller bearing can withstand without increasing the outer diameter of the tapered roller bearing.
SOLUTION: An outer ring 11, an inner ring 20 disposed on the inner peripheral side of the outer ring 11, a tapered roller 40 rolling between the outer ring 11 and the inner ring 20, and a plurality of tapered rollers 40 are spaced apart in the circumferential direction. In the tapered roller bearing comprising the cage 30 arranged in the manner described above, a guide flange 23 projecting in the radial direction is formed on one of the small diameter side of the outer ring 11 and the small diameter side of the inner ring 20, and the guide flange 23 and the cone are formed. The cage 30 is disposed between the rollers 40, the first sliding contact surface 31 that is slidably contacted with the guide flange 23 in the rotational direction is formed on the cage 30, and the cage 30 rotates with respect to the tapered roller 40. A second sliding contact surface 32 that slides in the direction is formed, and the engagement portion 33 that engages the retainer 30 in the circumferential direction with respect to the tapered roller 40 and holds the tapered roller 40 at an interval in the circumferential direction. Formed.
[Selection] Figure 1

Description

  The present invention relates to a tapered roller bearing in which a plurality of tapered rollers and a cage are arranged between an outer ring and an inner ring.

  As shown in FIG. 7 (Patent Document 1), the tapered roller bearing 100 includes an inner ring 110, an outer ring 120, a tapered roller 130 that rolls between the inner ring 110 and the outer ring 120, and a tapered roller 130 spaced in the circumferential direction. And a retainer 140 that holds the shaft rotatably.

  The general tapered roller 130 is rotatably held in the pocket 141 of the retainer 140 as shown in a part of FIG. 8, but the part shown in FIG. 7 and FIG. Most of the pillar portions are eliminated, the convex portion 144 is formed on the small-diameter side annular portion 143 of the cage 140, and the convex portion 146 is formed on the large-diameter side annular portion 145 of the cage 140. The tapered rollers 130 are rotatably held by forming concave portions 131 and 132 on both end faces of the tapered rollers 130 and engaging the concave portions 131 and 132 with the convex portions 144 and 146, respectively.

  This increases the load that the tapered roller bearing 100 can withstand by eliminating most of the column portions and increasing the number of tapered rollers 130.

  Since the retainer 140 is held by the tapered roller 130 via the pocket 141 so as to be rotatable around the axis of the tapered roller bearing 100, a minimum number of column portions 142 are required, and the number of tapered rollers 130 is increased. However, the load that can be withstood by the tapered roller bearing could not be increased.

JP 2008-121743 A

  The present invention has been made to solve the above-described problems, and an object of the present invention is to further increase the load that the tapered roller bearing can withstand without increasing the outer diameter of the tapered roller bearing.

According to the first aspect of the present invention, an outer ring, an inner ring disposed on the inner peripheral side of the outer ring, a tapered roller that rolls between the outer ring and the inner ring, and a plurality of tapered rollers are spaced in the circumferential direction. In a tapered roller bearing consisting of a cage that is arranged in a space,
A guide rod portion projecting in the radial direction is formed on one of the small diameter side of the outer ring and the small diameter side of the inner ring, and the cage is disposed between the guide rod portion and the tapered roller, and the cage A first slidable contact surface that is slidably contacted with the guide flange in the rotational direction is formed, a second slidable contact surface that is slidably contacted with the tapered roller in the rotational direction is formed on the retainer, and the retainer is An engagement portion is formed that engages with the tapered roller in the circumferential direction and holds the tapered roller at an interval in the circumferential direction.

  The invention according to claim 2 is characterized in that the engaging portion is an engaging protrusion which is in sliding contact with the outer periphery of the tapered roller on the outer ring side.

  According to a third aspect of the present invention, the engaging portion is an engaging convex portion protruding to the large-diameter side end surface of the tapered roller, and is engaged with the engaging convex portion on the large-diameter side end surface of the tapered roller. The engaging concave portion is formed, and the engaging convex portion and the engaging concave portion are provided coaxially with the rotation axis of the tapered roller.

  According to the present invention, it is possible to further increase the load that the tapered roller bearing can withstand without increasing the outer diameter of the tapered roller bearing.

It is sectional drawing of the tapered roller bearing in the 1st Embodiment of this invention. It is an A arrow line view of FIG. 1 of the tapered roller bearing in the 1st Embodiment of this invention. It is sectional drawing of the tapered roller bearing in the 2nd Embodiment of this invention. It is a B arrow directional view of FIG. 1 of the tapered roller bearing in the 2nd Embodiment of this invention. It is sectional drawing of the tapered roller bearing in the 3rd Embodiment of this invention. It is sectional drawing of the tapered roller bearing in the 4th Embodiment of this invention. It is sectional drawing of the conventional tapered roller bearing. It is a front view of the retainer of the conventional tapered roller bearing.

  A first embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a cross-sectional view of a tapered roller bearing, and FIG. 2 is a view taken in the direction of arrow A in FIG.

  As shown in FIGS. 1 and 2, the tapered roller bearing 10 is disposed between a ring-shaped outer ring 11, a ring-shaped inner ring 20 disposed on the inner peripheral side of the outer ring 11, and the outer ring 11 and the inner ring 20. It consists of a ring-shaped cage 30 and a plurality of tapered rollers 40 that are spaced apart in the circumferential direction by the cage 30. The outer ring 11, the inner ring 20, the cage 30, and the tapered roller 40 are all made of a metal material, and in particular, an iron-based material is often used.

  An outer ring-side raceway surface 12 that is inclined with respect to the axis of the outer ring 11 is formed on the inner periphery of the outer ring 11. An inner ring-side raceway surface 22 that is inclined with respect to the axis of the inner ring 20 is formed on the outer periphery of the inner ring 20. Further, the inner ring 20 is formed with a small-diameter flange 23 projecting in the outer diameter direction on the small diameter side with the inner ring side raceway surface 22 interposed therebetween, and projecting in the outer diameter direction on the large diameter side with the inner ring side raceway surface 22 interposed therebetween. A large-diameter side flange 24 is formed. A small-diameter side inner end surface 25 that contacts a first sliding surface 31 (described later) of the cage 30 is formed on the end surface of the small-diameter flange portion 23 on the tapered roller 40 side. A large-diameter inner end surface 26 that contacts a later-described large-diameter side end surface 42 of the tapered roller 40 is formed on the end surface of the large-diameter flange 24 on the tapered roller 40 side.

  The inner ring 20 includes a large-diameter side member 50 in which the inner ring-side raceway surface 22 and the large-diameter side flange 24 are formed, and a small-diameter side member 55 in which the small-diameter side flange 23 is formed. The members 55 are coaxially connected to each other via bolts 56. A fitting surface is formed on the inner peripheral side of the inner ring 20 so that the holding shaft 60 can be inserted. The holding shaft 60 serves to assemble the large diameter side member 50 and the small diameter side member 55 coaxially with each other. The inner ring 20 can be divided into two members, a large-diameter side member 50 and a small-diameter side member 55, because the tapered roller 40 and the cage 30 are assembled.

  The cage 30 has a ring shape, and is disposed between the outer ring 11 and the inner ring 20 in the radial direction, and is disposed between the small-diameter side flange 23 and the tapered roller 40 in the axial direction. The retainer 30 has a first sliding surface 31 that is in sliding contact with the inner diameter end surface 25 of the inner ring 20 in the rotational direction of the inner ring 20, and the tapered roller 40 with respect to a later-described smaller diameter end face 41 of the tapered roller 40. The second sliding surface 32 is in sliding contact with the rotation direction. Furthermore, the retainer 30 has an engaging convex portion 33 that protrudes from the second sliding surface 32 toward the small diameter end surface 41 side of the tapered roller 40, and this engaging convex portion 33 is an engaging portion of the tapered roller 40 described later. The joint recess 43 is engaged in the rotation direction of the inner ring 20. A plurality of engaging convex portions 33 are formed at equal intervals in the circumferential direction of the inner ring 20, and the plurality of tapered rollers 40 are held at intervals in the circumferential direction of the inner ring 20 by the engaging convex portions 33 and the engaging concave portions 43. It has the function to do. The first sliding surface 31 and the second sliding surface 32 are surfaces perpendicular to the rotation axis of the tapered roller 40. The cage 30 is formed by forging or the like and finished to a predetermined dimension by cutting.

  The tapered roller 40 has a shape obtained by removing the top from the conical shape, and is formed on a rolling surface that rolls on the outer ring side raceway surface 12 and the inner ring side raceway surface 22 and an end surface on the small diameter side. It has a small-diameter side end surface 41 and a large-diameter side end surface 42 formed on the large-diameter side end surface. An engagement recess 43 is formed on the small-diameter end surface 41, and the engagement recess 43 engages with the engagement protrusion 33 of the retainer 30 in the circumferential direction of the inner ring 20. The engaging concave portion 43 and the engaging convex portion 33 are formed coaxially with the rotation axis of the tapered roller 40.

  Next, the assembling operation will be described based on the configuration described above.

  The large diameter side member 50 is fitted to the holding shaft 60, and the cage 30 is loosely fitted to the inner ring side raceway surface 22. Next, the tapered roller 40 is disposed on the inner ring side raceway surface 22 between the large-diameter side flange portion 24 and the cage 30, and the engaging convex portion 33 of the cage 30 is engaged with the engaging concave portion 43 of the tapered roller 40. Combine. The small diameter side member 55 is fitted to the holding shaft 60 and the bolt 56 is screwed to connect the large diameter side member 50 and the small diameter side member 55 coaxially. The holding shaft 60 is extracted from the large diameter side member 50 and the small diameter side member 55. Thus, the inner ring 20, the cage 30 and the tapered roller 40 are integrated so as not to fall apart, and the integrated inner ring 20, the cage 30 and the tapered roller 40 are assembled to a rotating shaft (not shown). The outer ring 11 is attached to a housing (not shown), and the inner ring 20, the retainer 30, and the tapered roller 40 integrated with the rotating shaft are inserted into the outer ring 11. Thus, the rotating shaft is supported on the housing via the tapered roller bearing 10.

  When the rotating shaft and the inner ring 20 assembled in this way are rotated, the tapered roller 40 moves in the same direction as the rotation direction of the inner ring 20 while rolling on the outer ring side raceway surface 12 and the inner ring side raceway surface 22. . At this time, the cage 30 is sandwiched between the small-diameter side flange portion 23 and the tapered roller 40 in the axial direction, is guided and supported by the small-diameter side inner end surface 25, and is engaged with the engagement concave portion 43 and the engagement convex portion in the circumferential direction. 33 is engaged, the retainer 30 rotates in the same direction as the inner ring 20 by the rolling of the tapered roller 40. As many tapered rollers 40 can be arranged in the circumferential direction of the inner ring 20 as there is no column portion of the retainer 30 between the tapered rollers 40, and the load that the tapered roller bearing 10 can withstand can be increased.

  The present invention is not limited to these embodiments, and can of course be implemented in various modes without departing from the gist of the present invention.

  In the first embodiment described above, the engaging protrusion 33 protruding toward the small diameter side end face 41 of the tapered roller 40 is formed on the second sliding surface 32 of the cage 30, and the engaging protrusion 33 is engaged. The engaging recess 43 to be mated was formed on the small diameter side end face 41 of the tapered roller 40. As a second embodiment, as shown in FIGS. 3 and 4, an engagement protrusion 73 protruding toward the tapered roller 40 side is formed on the retainer 70, and the tapered roller 40 is formed on both sides in the circumferential direction of the engagement protrusion 73. You may form the 3rd sliding surface 74 which slidably contacts to the outer periphery of the outer ring | wheel 11 side. The engaging protrusions 73 are disposed between the tapered rollers 40, and the engaging protrusions 73 have a function of holding the tapered rollers 40 at intervals in the circumferential direction. The cage 70 is formed with a first sliding surface 71 that is in sliding contact with the small-diameter side inner end surface 25 and a second sliding surface 72 that is in sliding contact with the small-diameter side end surface 41 of the tapered roller 40. The same parts and the same surfaces as those of the first embodiment are given the same numbers and the description thereof is omitted.

  In the first embodiment described above, the cage 30 is guided and supported by the small-diameter inner end surface 25 of the small-diameter side flange 23 of the inner ring 20 so as to be movable in the circumferential direction. As shown in FIG. 5, as shown in FIG. 5, a guide rod part 16 that protrudes toward the inner ring 90 is formed on the inner periphery of the outer ring 15 on the small diameter side, and the end surface of the guide rod part 16 on the tapered roller 40 side is formed. The guide surface 17 may be formed, and the cage 75 may be guided and supported on the guide surface 17 so as to be movable in the circumferential direction. In this case, the small-diameter side flange 93 of the inner ring 90 is such that the retainer 75 does not come out of the inner ring 90 so that the tapered roller 40 and the retainer 75 do not fall apart when the tapered roller 40 is assembled to the inner ring 90. The outer diameter of the small-diameter side flange portion 93 is slightly larger than the inner diameter of the cage 75. When the retainer 75 is fitted into the small-diameter side flange 93, the retainer 75 is made of resin so that the inner peripheral side of the retainer 75 can be deformed. As the inner ring 90, a small diameter side flange 93 and a large diameter side flange 94 are integrated.

  An outer ring side raceway surface 18 that is inclined with respect to the axis of the outer ring 15 is formed on the inner periphery of the outer ring 15 in the third embodiment. An inner ring side raceway surface 92 that is inclined with respect to the axis of the inner ring 90 is formed on the outer periphery of the inner ring 90, and a small diameter side flange portion 93 that protrudes in the outer diameter direction is formed on the small diameter side across the inner ring side raceway surface 92. A large-diameter side flange 94 protruding in the outer diameter direction is formed on the large-diameter side with the inner ring-side raceway surface 92 interposed therebetween. A small-diameter side inner end surface 95 is formed on the end surface of the small-diameter side flange portion 93 on the tapered roller 40 side, and an end surface on the tapered roller 40 side of the large-diameter side flange portion 94 is formed on the large-diameter side end surface 42 of the tapered roller 40. A large-diameter side inner end face 96 that comes into contact is formed.

  The cage 75 in the third embodiment has a first sliding surface 76 that is in sliding contact with the inner diameter 90 of the inner ring 90 in the rotational direction of the inner ring 90, and the smaller diameter end face 41 of the tapered roller 40. It has the 2nd sliding surface 77 which slidably contacts to the rotation direction of the tapered roller 40. FIG. Furthermore, the retainer 75 has an engaging convex portion 78 that protrudes from the second sliding surface 77 toward the small diameter end surface 41 of the tapered roller 40, and the engaging convex portion 78 is an engaging concave portion of the tapered roller 40. 43 is engaged in the rotation direction of the inner ring 20. A plurality of engagement protrusions 78 are formed at equal intervals in the circumferential direction of the inner ring 20, and the plurality of tapered rollers 40 are held at intervals in the circumferential direction of the inner ring 20 by the engagement protrusions 78 and the engagement recesses 43. It has the function to do. The first sliding surface 76 and the second sliding surface 77 are surfaces perpendicular to the rotation axis of the tapered roller 40. The same parts and the same surfaces as those of the first embodiment are given the same numbers and the description thereof is omitted.

  In the third embodiment described above, the cage 75 is guided and supported on the guide surface 16 of the outer ring 15 so as to be movable in the circumferential direction. As a fourth embodiment, as shown in FIG. 6, the cage 75 may be guided and supported on the small diameter side inner end surface 98 of the small diameter side flange 97 of the inner ring 90 so as to be movable in the circumferential direction. In this case, the same outer ring 11 as in the first embodiment is used. The inner ring 90 is the same except that the shapes of the small-diameter side flange 87 and the small-diameter side inner end face 98 are changed. In a state where the tapered roller 40 is assembled to the inner ring 90, the outer diameter of the small-diameter side flange 93 is slightly larger than the inner diameter of the cage 75 so that the tapered roller 40 and the cage 75 do not fall apart. When the retainer 75 is fitted into the small-diameter side flange 93, the retainer 75 is made of resin so that the inner peripheral side of the retainer 75 can be deformed. The same parts and the same surfaces as those in the first embodiment and the third embodiment are assigned the same numbers, and description thereof is omitted.

11: outer ring, 20: inner ring, 23: small-diameter side flange (guide flange), 30: retainer, 31: first sliding surface, 32: second sliding surface, 33: engaging convex portion ( Engagement portion), 40: tapered roller, 43: engagement recess, 70: retainer, 71: first sliding surface, 72: second sliding surface, 73: engaging protrusion (engaging portion)

Claims (3)

An outer ring, an inner ring disposed on the inner peripheral side of the outer ring, a tapered roller that rolls between the outer ring and the inner ring, and a cage that disposes a plurality of tapered rollers at intervals in the circumferential direction. In tapered roller bearings,
A guide rod portion projecting in the radial direction is formed on one of the small diameter side of the outer ring and the small diameter side of the inner ring, and the cage is disposed between the guide rod portion and the tapered roller, and the cage A first slidable contact surface that is slidably contacted with the guide flange in the rotational direction is formed, a second slidable contact surface that is slidably contacted with the tapered roller in the rotational direction is formed on the retainer, and the retainer is A tapered roller bearing comprising: an engaging portion that engages with the tapered roller in a circumferential direction and holds the tapered roller at an interval in the circumferential direction.   2. The tapered roller bearing according to claim 1, wherein the engaging portion is an engaging protrusion that is in sliding contact with an outer periphery of the tapered roller on the outer ring side.   The engaging portion is an engaging convex portion protruding to the large-diameter side end surface of the tapered roller, and an engaging concave portion that engages with the engaging convex portion is formed on the large-diameter side end surface of the tapered roller, The tapered roller bearing according to claim 1, wherein the engaging convex portion and the engaging concave portion are provided coaxially with a rotation axis of the tapered roller.

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