KR20170093707A - Roller bearing - Google Patents

Abstract

The present invention provides a roller bearing having a roller rotated around a roller shaft inclined with respect to a rotating shaft. The roller bearing comprises: an outer race having an external electric surface on which a roller is electrically driven; an inner race surrounded by the outer race, and determining a rotating shaft; and a retention supporter arranged between the outer race and the inner race to restrict displacement of the roller in an extension installation direction of the roller shaft. The roller has a first end surface and a second end surface placed on an external side in a surrounding direction compared to the first end surface. The retention supporter is in contact with the first end surface, and has a restriction wheel restricting displacement of the roller. The restriction wheel is connected to at least one side of the inner race or the outer race at a side of the first end surface.

Description

Roller Bearing {ROLLER BEARING}

The present invention relates to a roller bearing.

The roller bearings have a high load capacity for radial load and axial load. In addition, roller bearings are excellent in impact resistance and rigidity, and thus are used in various technical fields.

When a roller having a long axial length is assembled to the roller bearing, the load capacity of the roller bearing becomes large. On the other hand, the axial length dimension of the roller bearing becomes large. Japanese Patent Application Laid-Open No. 2009-36327 proposes a technique of removing a flange portion on the small diameter side and assembling a long tapered roller

According to Japanese Patent Application Laid-Open No. 2009-36327, a holding device for holding a tapered roller is engaged with a groove formed in a flange portion arranged on the large diameter side. The formation of the groove portion with respect to the flange portion results in a reduction in the strength of the flange portion, so that the designer needs to form the flange portion thick on the large diameter side. Therefore, the technique disclosed in Japanese Laid-Open Patent Publication No. 2009-36327 enables the use of the long tapered roller, but increases the axial length dimension of the tapered roller bearing itself.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a technique which makes it possible to assemble a long roller without increasing the axial length dimension of the roller bearing itself.

A roller bearing according to one aspect of the present invention has a roller that rotates around a roller axis inclined with respect to the rotational axis. The roller bearing includes an outer race having an outer circumferential surface to which the roller rotates, an inner race surrounded by the outer race and defining the rotational axis, and a roller shaft disposed to restrict the displacement of the roller in the extending direction of the roller shaft And a retainer disposed between the outer race and the inner race. The roller includes a first end surface and a second end surface located circumferentially outwardly of the first end surface. The holding device includes a regulating wheel that abuts against the first end face at the time of assembling and regulates the displacement of the roller. The holding device is connected to at least one of the inner race or the outer race on the side of the first end face.

The present invention makes it possible to assemble long rollers without increasing the axial length dimension of the roller bearings themselves.

The objects, features and advantages of the roller bearings described above will become more apparent from the following detailed description and accompanying drawings.

1 is a schematic partial cross-sectional view of a roller bearing according to a first embodiment.
Fig. 2 is a schematic plan view of the holder of the roller bearing shown in Fig. 1. Fig.
3 is a schematic partial cross-sectional view of the roller bearing of the second embodiment.
4 is a schematic partial cross-sectional view of the roller bearing of the third embodiment.
5 is a schematic partial cross-sectional view of the roller bearing of the fourth embodiment.

≪ First Embodiment >

The present inventors have found various structures for assembling rollers having a long axial length into roller bearings in order to increase the load capacity of the roller bearings. In the first embodiment, an exemplary roller bearing is described.

1 is a schematic partial cross-sectional view of a tapered roller bearing (roller bearing) 100 of the first embodiment. Referring to Figure 1, a tapered roller bearing 100 is described.

The tapered roller bearing 100 includes a plurality of tapered rollers 110 (one of which is shown as one of a plurality of tapered rollers 110), an outer race 120, an inner race 130, , And a holding device (140). The outer race 120 and the inner race 130 are both annular. The roller 110 illustrates a tapered roller. The roller 110 may be a cylindrical roller. The inner race 130 is surrounded by the outer race 120. The outer race 120 and the inner race 130 cooperate to determine the rotation axis AX1. The outer race 120 and the inner race 130 relatively rotate about the rotation axis AX1.

The plurality of taper rollers 110 are annularly arranged between the outer race 120 and the inner race 130. Each of the plurality of taper rollers 110 rotates about a rotation axis AX2 inclined at a predetermined tilt angle (> 0 DEG) with respect to the rotation axis AX1. In the present embodiment, the roller shaft is exemplified by the rotation axis AX2.

Each of the plurality of taper rollers 110 is conical (in the case of a cylindrical roller, it is normal). Each of the plurality of taper rollers 110 includes a generally circular first end surface 111 and a generally circular second end surface 112 and a first end surface 111 and a second end surface 112, (Not shown). The axis of rotation AX2 passes through the centers P1, P2 of the first end face 111 and the second end face 112. The second end face 112 is wider than the first end face 111. The center P2 of the second end face 112 is spaced from the rotation axis AX1 more than the center P1 of the first end face 111. [ In other words, the taper roller 110 has a first end surface and a second end surface that is located outwardly in the peripheral direction from the first end surface.

The outer race 120 includes a rolling surface 121 inclined with respect to the rotation axis AX1. The peripheral surface 113 of the taper roller 110 abuts against the raceway surface 121. The taper roller 110 rotates about the rotation axis AX2 and rolls on the rolling surface 121. [ In the present embodiment, the rolling contact surface 121 is exemplified by the rolling surface 121.

The inner race 130 includes an opposing face 131 opposed to the raceway surface 121 of the outer race 120. The opposite surface 131 includes a rolling surface 132 and an extending surface 133. The circumferential surface 113 of the taper roller 110 also abuts the rolling surface 132. The taper roller 110 rotates about the rotation axis AX2 and rolls over the rolling surface 132. [ The extension surface 133 extends from the raceway surface 132. The extension surface 133 is located closer to the first end surface 111 than the second end surface 112 of the tapered roller 110. Unlike the rolling surface 132 which is inclined with respect to the rotation axis AX1, the extending surface 133 is substantially parallel to the rotation axis AX1. In this embodiment, the inner raceway surface is exemplified by the raceway surface 132.

The inner race 130 further includes a flange portion 134 protruding from the raceway surface 132 toward the outer race 120. The flange portion 134 abuts the second end face 112 of the tapered roller 110. [

Fig. 1 shows two arrows parallel to the rotation axis AX2. The direction indicated by an arrow pointing from the second end face 112 toward the first end face 111 is referred to as a "first direction" in the following description. The direction indicated by an arrow pointing from the first end face 111 to the second end face 112 is referred to as a " second direction " in the following description. The flange portion 134 regulates the displacement of the taper roller 110 in the second direction.

Fig. 2 is a schematic plan view of the retainer 140. Fig. Referring to Figures 1 and 2, a tapered roller bearing 100 is further described.

As shown in FIG. 1, a holding device 140 is disposed between the outer race 120 and the inner race 130. The holding device 140 is used to regulate the displacement of the taper roller 110 in the first direction and the second direction.

2, the holding device 140 includes a first regulating wheel 141, a second regulating wheel 142, and a plurality of connecting pieces 143. As shown in Fig. The first regulated wheel 141 is an annular portion adjacent to the first end face 111 of the tapered roller 110. The second regulated wheel 142 is an annular portion adjacent the second end face 112 of the tapered roller 110. The second regulated wheel 142 has a larger diameter than the first regulated wheel 141. The plurality of connecting pieces 143 are arranged at substantially equal intervals around the rotation axis AX1 and connect the first regulated wheel 141 and the second regulated wheel 142 to each other. Thus, the retainer 140 is generally conical in shape.

A substantially trapezoidal pocket 144 is formed between the adjacent connecting pieces 143. [ A plurality of taper rollers (110) are received in a plurality of pockets (144) formed in the holding device (140).

As shown in Fig. 1, the first regulated wheel 141 includes a main wheel 145 and a protruded wheel 146. As shown in Fig. The main wheel 145 is an annular portion including a restricting surface 147 opposed to the first end surface 111 of each of the plurality of taper rollers 110. The protruding wheel 146 is an annular portion protruding from the inner periphery of the main wheel 145 toward the rotation axis AX1. The restricting surface 147 abuts the first end face 111 and regulates the displacement of the taper roller 110 in the first direction. In the present embodiment, the regulated wheel is exemplified by the first regulated wheel 141.

On the opposing face 131, the groove wheel 135 is recessed. The groove wheel 135 rotates around the rotation axis AX1 for one week. The groove wheel 135 has a substantially semicircular cross section. The groove wheel 135 is formed along the boundary between the rolling surface 132 and the extending surface 133. The groove wheel 135 is easily formed by undercut processing performed when the inner race 130 is formed. The protruding wheel 146 of the first regulated wheel 141 is engaged with the groove wheel 135. [ The retainer 140 is securely fixed to the opposing surface 131 by the engagement between the protruding wheel 146 and the groove wheel 135 so that the taper roller 110 does not fall off. In this embodiment, the recess is exemplified by the groove wheel 135. [ The protrusion is exemplified by the protruding wheel 146.

≪ Second Embodiment >

The concave portion engaging with the holding support may be formed on the extended surface. In this case, the overlapping length of the first regulated wheel and the raceway surface is shortened. As a result, the long tapered roller can be assembled to the tapered roller bearing. In a second embodiment, an exemplary tapered roller bearing with recesses formed in the extension surface is described.

3 is a schematic partial cross-sectional view of the tapered roller bearing 100A of the second embodiment. Referring to Fig. 3, the tapered roller bearing 100A is described. The description of the first embodiment is used for elements having the same reference numerals as those of the first embodiment.

As in the first embodiment, the tapered roller bearing 100A includes a plurality of tapered rollers 110 (one of which is shown as one of the plurality of tapered rollers 110) and an outer race 120. The description of the first embodiment is used for these elements.

The tapered roller bearing 100A further includes an inner race 130A and a holding device 140A. As in the first embodiment, the inner race 130A includes a raceway surface 132 and a flange portion 134. [ The description of the first embodiment is used for these elements.

The inner race 130A further includes an extended surface 133A. The extending surface 133A extends from the rolling surface 132. [ The extended surface 133A is located closer to the first end surface 111 than the second end surface 112 of the tapered roller 110. [ The extending surface 133A is substantially parallel to the rotation axis AX1, unlike the rolling surface 132 which is inclined with respect to the rotation axis AX1.

Similar to the first embodiment, the holding device 140A includes a second restricting wheel 142 and a plurality of connecting pieces 143 (one of the plurality of connecting pieces 143 is shown in Fig. 3). The description of the first embodiment is used for these elements.

The holding device 140A further includes a first regulated wheel 141A. The first regulated wheel 141A is an annular portion adjacent to the first end face 111 of the taper roller 110. [ As in the first embodiment, the first regulated wheel 141A includes a main wheel 145. [ The description of the first embodiment is used for the main wheel 145.

The holding device 140A includes at least three protrusions 146A (Fig. 3 shows one of at least three protrusions 146A). The projection 146A is a lump portion protruding from the inner periphery of the main wheel 145 toward the rotation axis AX1.

The concave portion 135A to which the projection 146A of the holding device 140 is engaged is formed concave on the extending surface 133A in contrast to the first embodiment. The concave portion 135A is formed corresponding to the projection 146A. The concave portion 135A has a vertical cross-section of a substantially rectangular shape. The projection 146A has a rectangular cross section that is complementary to the recess 135A. Therefore, the projection 146A is reliably inserted into the recess 135A.

≪ Third Embodiment >

The concave portion engaging with the holding support may be formed on the raceway surface. In this case, the inner race may not have an extended surface. As a result, the tapered roller bearing becomes lightweight. In the third embodiment, an exemplary tapered roller bearing having a concave portion formed in the raceway surface is described.

4 is a schematic partial cross-sectional view of the tapered roller bearing 100B of the third embodiment. Referring to Fig. 4, a tapered roller bearing 100B is described. The description of the second embodiment is used in the same elements as those in the second embodiment.

The tapered roller bearing 100B includes a plurality of tapered rollers 110 (one of which is shown as one of the plurality of tapered rollers 110), an outer race 120, (140). The description of the second embodiment is used for these elements.

The tapered roller bearing 100B further includes an inner race 130B. As in the second embodiment, the inner race 130B includes a flange portion 134. [ The description of the second embodiment is used in the flange portion 134. [

The inner race 130B further includes a raceway surface 132B. The peripheral surface 113 of the taper roller 110 abuts against the raceway surface 132B. The taper roller 110 rotates about the rotation axis AX2 and rolls over the rolling surface 132B. The flange portion 134 protrudes from the raceway surface 132B toward the outer race 120. In this embodiment, the inner raceway surface is exemplified by the raceway surface 132B.

The rolling surface 132B includes a proximal edge 136 and a proximal edge 137 opposite the proximal edge 136. [ The rolling surface 132B is inclined with respect to the rotation axis AX1 in the section from the base end edge 136 to the leading edge edge 137. [

The inner race 130B includes a distal end surface 138. [ The leading end face 138 is perpendicular to the rotational axis AX1 and also forms an annular band region on an imaginary plane (not shown) defined to encompass the leading edge 137.

The concave portion 135B in which the protrusion 146A of the holding device 140 is engaged is formed concave in the raceway surface 132B in the vicinity of the leading edge edge 137 in a manner different from the second embodiment. The concave portion 135B is formed corresponding to the projection 146A. The concave portion 135B has a vertical cross-section of a substantially rectangular shape. The projection 146A has a rectangular cross section that is complementary to the recess 135B. Therefore, the projection 146A is reliably inserted into the concave portion 135B.

The projecting direction of the projection 146A from the main wheel 145 is substantially perpendicular to the extending direction of the rotation axis AX1. Likewise, the concave forming direction of the concave portion 135B from the rolling contact surface 132B is also substantially perpendicular to the extending direction of the rotation axis AX1. Therefore, the projection 146A is appropriately inserted into the concave portion 135B.

≪ Fourth Embodiment &

The concave forming direction of the concave portion recessed in the raceway surface may be perpendicular to the rotational axis of the tapered roller. In this case, the projecting direction of the projecting portion engaging with the concave portion is also set to be perpendicular to the rotation axis of the tapered roller. In the fourth embodiment, an exemplary tapered roller bearing having a retaining structure in which recessed and projected in a direction perpendicular to the rotation axis of the tapered roller is described.

5 is a schematic partial cross-sectional view of the tapered roller bearing 100C of the fourth embodiment. Referring to Fig. 5, a tapered roller bearing 100C will be described. The description of the third embodiment is used for elements having the same reference numerals as those of the third embodiment.

Similar to the third embodiment, the tapered roller bearing 100C includes a plurality of tapered rollers 110 (one of the plurality of tapered rollers 110 is shown in FIG. 5) and an outer race 120. The description of the third embodiment is used in these elements.

The tapered roller bearing 100C further includes an inner race 130C and a holding device 140C. As in the third embodiment, the inner race 130C includes a flange portion 134 and a distal end surface 138. [ The description of the third embodiment is used in these elements. Similar to the third embodiment, the holding device 140C includes a second restricting wheel 142 and a plurality of connecting pieces 143 (one of the plurality of connecting pieces 143 is shown in Fig. 5). The description of the third embodiment is used in these elements.

The inner race 130C further includes a raceway surface 132C. As in the third embodiment, the rolling surface 132C includes a base end edge 136 and a tip end edge 137. [ The description of the third embodiment is used in these elements.

The rolling surface 132C is inclined with respect to the rotation axis AX1 in the section from the base end edge 136 to the leading edge edge 137. [ The peripheral surface 113 of the taper roller 110 abuts against the raceway surface 132C. The taper roller 110 rotates about the rotation axis AX2 and rolls on the raceway surface 132C. The flange portion 134 protrudes from the raceway surface 132C toward the outer race 120. In this embodiment, the inner raceway surface is exemplified by the raceway surface 132C.

The concave portion 135C is recessed in the raceway surface 132C in the vicinity of the leading edge edge 137. [ The concave portion 135C has a substantially rectangular cross-section. The concave forming direction of the concave portion 135C from the rolling surface 132C is substantially perpendicular to the extending direction of the rotation axis AX2.

The holding device 140C includes a first regulated wheel 141C. As in the third embodiment, the first regulated wheel 141C includes a main wheel 145. [ The description of the third embodiment is used for the main wheel 145.

The first regulated wheel 141C further includes at least three protrusions 146C (Fig. 5 represents one of at least three protrusions 146C). The projection 146C projects from the inner periphery of the main wheel 145 in a direction perpendicular to the rotation axis AX2. The concave portion 135C is formed corresponding to the projection 146C. Therefore, the projection 146C is properly inserted into the concave portion 135C. In addition, the projection 146C has a vertical cross-section in the shape of a rectangle complementary to the recess 135C. Therefore, the projection 146C is reliably inserted into the concave portion 135C.

The design principles described in connection with the various embodiments described above are applicable to various tapered roller bearings. Some of the various features described in connection with one of the various embodiments described above may be applied to the tapered roller bearing described in connection with another embodiment.

In the above-described embodiment, the holding device is provided in the inner race. However, the same installation structure may be applied to the outer race. The holding device 140 restricts the displacement of the taper roller 110 in the first direction and the second direction only at the time of assembling and after the assembly the first regulating wheel 141 and the second regulating wheel 142 Contact state. Similarly, after the assembly, the concave portion and the projection portion may be brought into a non-contact state. Further, the retaining device can perform the assembling operation while the roller is held by the inner race or the outer race, by engaging the projection with the concave portion. Further, the bottom surface of the concave portion shown in Fig. 1 may be formed in a circular arc shape in section, or the projecting portion may be in a shape along the circular arc shape in this cross section.

The roller bearings described in connection with the above embodiments mainly include the following features.

The roller bearing according to one aspect of the above-described embodiment has a roller that rotates around a roller axis inclined with respect to the rotational axis. The roller bearing includes an outer race having an outer circumferential surface on which the roller is rotated, an inner race surrounded by the outer race and defining the rotational axis, and an inner race for regulating the displacement of the roller in the extending direction of the roller axis And a retainer disposed between the outer race and the inner race so as to allow the inner race to be in contact with the outer race. The roller includes a first end surface and a second end surface located circumferentially outwardly of the first end surface. The holding device includes a regulating wheel that abuts against the first end face at the time of assembling and regulates the displacement of the roller. The holding device is connected to at least one of the inner race or the outer race on the side of the first end face.

According to the above configuration, since the restricting ring of the retainer abuts against the first end face, the retainer can appropriately regulate the displacement of the roller. Since the flange portion on the first end face side of a general roller bearing is not required, the roller can have a large dimension in the extending direction of the roller shaft. The retaining unit which abuts against the first end face and regulates the displacement of the roller is connected to at least one of the inner race and the outer race so that the retaining unit is capable of moving the outer race and / And is suitably fixed in the space surrounded by the lace and / or inner race. Therefore, the long roller is assembled to the roller bearing without increasing the axial length dimension of the roller bearing itself.

With respect to the above configuration, the inner race may include an opposing face opposing the outer electrokinetic face. The retainer may include a protrusion that engages with a concave portion formed in the concave surface on the opposed surface.

According to the above configuration, the holding device includes the protruding portion which engages with the recess formed in the facing surface of the inner race facing the outer electrokinetic surface, so that the holding device is suitably held on the opposing surface. Since the engagement structure formed by the recesses and the protrusions is constructed in the space surrounded by the outer race and / or the inner race, the long roller can be assembled to the roller bearing without increasing the axial length dimension of the roller bearing itself do. The end portion of the inner race on the first end face side is located on the second end face side in the axial direction with respect to the outer race even when the concave portion is formed. The end portion of the inner race on the first end face side does not protrude even when the concave portion is formed, so that the axial length dimension of the roller bearing itself is not long.

With respect to the above configuration, the concave portion may be a groove wheel formed on the opposed surface so as to wind the rotation shaft. The protruding portion may be a protruding ring that engages with the groove wheel.

According to the above configuration, the projecting portion is a protruding ring that engages with the groove wheel formed on the opposite surface so as to wind the rotation shaft, so that the holding device is firmly fixed on the opposing surface. Therefore, the holding device can appropriately regulate the displacement of the roller to the small diameter side.

With respect to the above configuration, the opposing surface may include an inner raceway surface on which the roller rolls, and an extending surface extending from the inner raceway surface in the extending direction of the rotation axis. The groove may be formed along a boundary between the inner raceway surface and the extended surface.

According to the above configuration, since the groove wheel is formed along the boundary between the inner raceway surface and the extended surface, the manufacturer of the inner race can form the groove wheel by employing undercut processing. Thus, the roller bearings are formed without requiring additional and / or special machining to form the groove rings.

With respect to the above arrangement, the opposing surface may include an inner raceway surface on which the roller is rotated and an extending surface extending from the inner raceway surface in a direction in which the rotation axis extends. The concave portion may be formed on the extended surface.

According to the above configuration, since the concave portion is formed on the extending surface, the holding device is easily installed in the inner race.

With respect to the above configuration, the opposing surface may be an inner rolling surface on which the roller is rotated. The concave portion may be formed on the inner raceway surface.

According to the above configuration, since the concave portion is formed on the inner raceway surface, the above-described extended surface is not required. Therefore, the roller bearings are lightweight.

In the above configuration, the regulated wheel may include a main wheel including a regulating surface opposed to the first end surface. The protruding portion may also contribute to the projection projecting from the main ring in a direction perpendicular to the roller axis.

According to the above configuration, since the protrusion protrudes from the main ring in a direction perpendicular to the roller shaft, the retainer can have a simple shape around the protruding wheel.

In the above configuration, the regulated wheel may include a main wheel including a regulating surface opposed to the first end surface. The projecting portion may be a projection projecting in a direction perpendicular to the rotation axis from the main wheel.

According to the above configuration, since the projections project from the main ring in a direction perpendicular to the rotation axis inclined with respect to the roller axis, the force components acting in the extending direction of the roller axes are engaged with each other, It acts in the direction of strengthening. Therefore, the projections are less likely to come off the groove wheel.

The principle of the above-described embodiment is suitably used in various technical fields using a tapered roller bearing.

Claims (8)

A roller bearing having a roller that rotates around a roller axis inclined with respect to a rotational axis,
An outer race having an outer circumferential surface on which the roller is rotated,
An inner race surrounded by the outer race and defining the rotation axis,
And a retainer disposed between the outer race and the inner race so as to regulate the displacement of the roller in the extending direction of the roller shaft,
Wherein the roller includes a first end surface and a second end surface located circumferentially outwardly of the first end surface,
Wherein the holding device includes a regulating wheel that comes into contact with the first end face at the time of assembling and can regulate the displacement of the roller,
And the retainer is connected to at least one of the inner race or the outer race on the side of the first end face. The method according to claim 1,
Wherein the inner race includes an opposed surface opposed to the outer circumferential surface,
Wherein the retainer includes a protrusion that engages with a concave portion recessed in the opposing surface. 3. The method of claim 2,
Wherein the concave portion is a groove wheel formed on the opposed surface to wind the rotation shaft,
And the protruding portion is a protruding ring that engages with the groove wheel. The method of claim 3,
Wherein the opposing surface includes an inner raceway surface on which the roller rotates and an extending surface extending from the inner raceway surface in an extending direction of the rotation axis,
Wherein the groove is formed along a boundary between the inner raceway surface and the extending surface,
Roller bearing. 3. The method of claim 2,
Wherein the opposing surface includes an inner raceway surface on which the roller rotates and an extending surface extending from the inner raceway surface in an extending direction of the rotation axis,
Wherein the recess is formed in the extended surface. 3. The method of claim 2,
Wherein the opposing surface is an inner rolling surface on which the roller is rolling,
And the concave portion is formed on the inner raceway surface. The method according to claim 6,
Wherein the regulating wheel includes a main wheel including a regulating surface opposed to the first end surface,
Wherein the protruding portion is a protrusion protruding from the main wheel in a direction perpendicular to the roller shaft. The method according to claim 6,
Wherein the regulating wheel includes a main wheel including a regulating surface opposed to the first end surface,
And the protrusion is a protrusion protruding from the main wheel in a direction perpendicular to the rotation axis.

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