TWI712750B - Roller bearing - Google Patents

Abstract

This application discloses a roller bearing having rollers that rotate around a roller shaft inclined with respect to a rotation axis. Roller bearings are equipped with: an outer race, which has the outer rolling surface on which the rollers roll; an inner race, which is surrounded by the outer race to determine the axis of rotation; and a retainer, which is arranged between the outer race and the inner race In order to limit the displacement of the roller in the extending direction of the roller shaft. The roller includes a first end surface and a second end surface located radially outward from the first end surface. The retainer includes a regulating wheel that abuts against the first end surface during assembly to restrict the displacement of the roller. The regulated gear train is connected to at least one of the inner race or the outer race on the first end surface side.

Description

Roller bearing

The invention relates to a roller bearing.

Roller bearings have high load capacity for radial loads and axial loads. In addition, roller bearings are also used in various technical fields because they are excellent in impact resistance and rigidity.

If a roller with a long shaft length is assembled into a roller bearing, the load capacity of the roller bearing becomes larger. On the other hand, the shaft length of the roller bearing becomes larger. Japanese Patent Application Publication No. 2009-36327 has proposed a technique for removing the flange on the small diameter side and assembling a long tapered roller.

According to Japanese Patent Application Laid-Open No. 2009-36327, the retainer holding the tapered roller is engaged with the groove formed in the flange portion arranged on the large diameter side. Since the formation of the groove toward the flange is attributed to the decrease in the strength of the flange, it is necessary for the designer to thicken the flange on the larger diameter side. Therefore, although the technology of Japanese Patent Application Publication No. 2009-36327 enables the use of long tapered rollers, it increases the shaft length of the tapered roller bearing itself.

The object of the present invention is to provide a technology that can assemble long rollers without increasing the shaft length of the roller bearing itself.

One aspect of the roller bearing of the present invention has rollers that rotate around a roller shaft that is inclined with respect to the rotation axis. The roller bearing includes: an outer race, which has the outer rolling surface on which the rollers roll; an inner race, which is surrounded by the outer race to determine the rotating shaft; and a cage, which is arranged on the front Between the outer race and the inner race, the displacement of the roller in the extending direction of the roller shaft is restricted during assembly. The roller includes a first end surface and a second end surface located radially outward from the first end surface. The retainer includes a regulating wheel that abuts against the first end surface during assembly to restrict the displacement of the roller. The retainer is connected to at least one of the inner race or the outer race on the first end surface side.

The invention can assemble long rollers without increasing the shaft length of the roller bearing itself.

The purpose, features and advantages of the aforementioned roller bearing will be explained more clearly with the following detailed description and drawings.

100: Tapered roller bearing (roller bearing)

100A: Tapered roller bearing

100B: Tapered roller bearing

100C: Tapered roller bearing

110: Tapered roller (roller)

111: first end face

112: 2nd end face

113: Surround

120: Outer seat ring

121: rolling surface

130: inner seat ring

130A: inner seat ring

130B: inner seat ring

130C: inner seat ring

131: Face/Opposite

132: rolling surface

132B: rolling surface

132C: rolling surface

133: extended surface

133A: Extended surface

134: Flange

135: groove wheel

135A: recess

135B: recess

135C: recess

136: Base end edge

137: leading edge

138: front face

140: retainer

140A: retainer

140C: retainer

141: First Regulation Round

141A: 1st regulation round

141C: 1st regulation round

142: Second Regulation Round

143: Link

144: Dimple

145: Main Wheel

146: Came

146A: protrusion

146C: protrusion

147: Regulations

AX1: Rotation axis

AX2: Rotation axis

P1: Center

P2: Center

Fig. 1 is a schematic partial cross-sectional view of the roller bearing of the first embodiment.

Figure 2 is a schematic plan view of the cage of the roller bearing shown in Figure 1.

Fig. 3 is a schematic partial cross-sectional view of the roller bearing of the second embodiment.

Fig. 4 is a schematic partial cross-sectional view of the roller bearing of the third embodiment.

Fig. 5 is a schematic partial cross-sectional view of a roller bearing of a fourth embodiment.

<First Embodiment>

In order to increase the load capacity of the roller bearing, the inventors of the present invention have proposed various structures for assembling rollers having a long axial length into the roller bearing. In the first embodiment, an exemplary roller bearing has been described.

Fig. 1 is a schematic partial cross-sectional view of a tapered roller bearing (roller bearing) 100 according to the first embodiment. 1, the tapered roller bearing 100 will be described.

The tapered roller bearing 100 includes a plurality of tapered rollers (rollers) 110 (FIG. 1 shows one of the plurality of tapered rollers 110 ), an outer race 120, an inner race 130, and a cage 140. Outer seat ring Both 120 and the inner race 130 are ring-shaped. The roller 110 is an example of a tapered roller. The roller 110 may also be a cylindrical roller. The inner race 130 is surrounded by the outer race 120. The outer race 120 and the inner race 130 cooperatively determine the rotation axis AX1. The outer race 120 and the inner race 130 relatively rotate around the rotation axis AX1.

A plurality of tapered rollers 110 are arranged in a ring shape between the outer race 120 and the inner race 130. The plurality of tapered rollers 110 respectively rotate around a rotation axis AX2 inclined at a specific inclination angle (>0°) with respect to the rotation axis AX1. In this embodiment, the roller shaft system is exemplified by the rotation axis AX2.

Each of the plurality of tapered rollers 110 has a truncated cone shape (in the case of cylindrical rollers, a cylindrical shape). The plurality of tapered rollers 110 respectively include a substantially circular first end surface 111, a substantially circular second end surface 112, and a peripheral surface 113 formed between the first end surface 111 and the second end surface 112. The rotation axis AX2 penetrates the centers P1 and P2 of the first end surface 111 and the second end surface 112. The second end surface 112 is wider than the first end surface 111. The center P2 of the second end surface 112 is farther from the rotation axis AX1 than the center P1 of the first end surface 111. That is, the tapered roller 110 has a first end surface and a second end surface located radially outward from the first end surface.

The outer race 120 includes a rolling surface 121 inclined with respect to the rotation axis AX1. The circumferential surface 113 of the tapered roller 110 abuts against the rolling surface 121. The tapered roller 110 rotates around the rotation axis AX2 and rolls on the rolling surface 121. In this embodiment, the outer rolling surface is exemplified by the rolling surface 121.

The inner race 130 includes an opposite surface 131 opposite to the rolling surface 121 of the outer race 120. The facing surface 131 includes a rolling surface 132 and an extended surface 133. The circumferential surface 113 of the tapered roller 110 also abuts against the rolling surface 132. The tapered roller 110 rotates around the rotation axis AX2 and rolls on the rolling surface 132. The extension surface 133 extends from the rolling surface 132. The extended 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 inclined with respect to the rotation axis AX1, the extended surface 133 is substantially parallel to the rotation axis AX1. In this embodiment, the inner rolling surface is exemplified by the rolling surface 132.

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

Figure 1 shows two arrows parallel to the axis of rotation AX2. The direction indicated by the arrow indicating the direction from the second end surface 112 to the first end surface 111 is referred to as the "first direction" in the following description. The direction indicated by the arrow indicating the direction from the first end surface 111 to the second end surface 112 is referred to as the "second direction" in the following description. The flange portion 134 restricts the displacement of the tapered roller 110 in the second direction.

FIG. 2 is a schematic plan view of the holder 140. The tapered roller bearing 100 will be further described with reference to FIGS. 1 and 2.

As shown in FIG. 1, the retainer 140 is disposed between the outer race 120 and the inner race 130. The retainer 140 is used to restrict the displacement of the tapered roller 110 in the first direction and the second direction.

As shown in FIG. 2, the holder 140 includes a first regulating wheel 141, a second regulating wheel 142, and a plurality of connecting pieces 143. The first regulating wheel 141 is adjacent to the annular portion of the first end surface 111 of the tapered roller 110. The second regulating wheel 142 is adjacent to the annular portion of the second end surface 112 of the tapered roller 110. The second regulating wheel 142 has a larger diameter than the first regulating wheel 141. The plurality of connecting pieces 143 are arranged at substantially equal intervals around the rotation axis AX1 to connect the first regulating wheel 141 and the second regulating wheel 142. Therefore, the holder 140 has a truncated cone shape as a whole.

A recess 144 having a substantially trapezoidal shape is formed between adjacent connecting pieces 143. The plurality of tapered rollers 110 are respectively accommodated in the plurality of recesses 144 formed in the holder 140.

As shown in FIG. 1, the first regulation wheel 141 includes a main wheel 145 and a cam wheel 146. The main wheel 145 includes an annular portion of the regulating surface 147 facing the first end surface 111 of each of the plurality of tapered rollers 110. The cam wheel 146 is an annular part protruding from the inner periphery of the main wheel 145 toward the rotation axis AX1. The regulating surface 147 abuts on the first end surface 111 and restricts the displacement of the tapered roller 110 in the first direction. In reality In the embodiment, the regulated wheel train is exemplified by the first regulated wheel 141.

A groove wheel 135 is recessed on the opposite surface 131. The sheave 135 makes one revolution around the rotation axis AX1. The sheave 135 has a substantially semicircular cross section. The sheave 135 is formed along the boundary between the rolling surface 132 and the extended surface 133. The sheave 135 is easily formed by the necking process performed when the inner race 130 is formed. The cam wheel 146 of the first regulating wheel 141 is engaged with the groove wheel 135. Since the retainer 140 is firmly fixed to the facing surface 131 by the engagement between the cam wheel 146 and the sheave wheel 135, the tapered roller 110 will not fall off. In this embodiment, the recessed portion is exemplified by the sheave 135. The protrusion is exemplified by the protrusion 146.

<Second Embodiment>

The concave portion that engages with the holder can also be formed on the extended surface. In this case, the overlapping length between the first regulating wheel and the rolling surface becomes shorter. As a result, long tapered rollers can be assembled into tapered roller bearings. In the second embodiment, an exemplary tapered roller bearing having a recess formed on an extended surface will be described.

Fig. 3 is a schematic partial cross-sectional view of a tapered roller bearing 100A of the second embodiment. The tapered roller bearing 100A will be described with reference to FIG. 3. The description of the first embodiment can be used for the requirements assigned the same symbols as those of the first embodiment.

As in the first embodiment, the tapered roller bearing 100A includes a plurality of tapered rollers 110 (FIG. 3 shows one of the plurality of tapered rollers 110) and an outer race 120. The description of the first embodiment can be applied to these requirements.

The tapered roller bearing 100A further includes an inner race 130A and a cage 140A. As in the first embodiment, the inner race 130A includes a rolling surface 132 and a flange portion 134. The description of the first embodiment can be applied to these requirements.

The inner race 130A further includes an extended surface 133A. The extension surface 133A extends from the rolling surface 132 Out. The extended surface 133A 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 inclined with respect to the rotation axis AX1, the extension surface 133A is substantially parallel to the rotation axis AX1.

As in the first embodiment, the holder 140A includes a second regulating wheel 142 and a plurality of connecting pieces 143 (FIG. 3 shows one of the plurality of connecting pieces 143). The description of the first embodiment can be applied to these requirements.

The holder 140A further includes a first regulating wheel 141A. The first regulating wheel 141A is adjacent to the annular portion of the first end surface 111 of the tapered roller 110. As in the first embodiment, the first regulated wheel 141A includes a main wheel 145. The description of the first embodiment can be applied to the main wheel 145.

The holder 140A includes at least three protrusions 146A (Figure 3 shows one of the at least three protrusions 146A). The protrusion 146A is a tumor-like part protruding from the inner circumference of the main wheel 145 toward the rotation axis AX1.

Unlike the first embodiment, the recess 135A to which the protrusion 146A of the holder 140 engages is recessed on the extension surface 133A. The recess 135A is formed corresponding to the protrusion 146A. The recess 135A has a longitudinal cross section of a substantially rectangular shape. The protrusion 146A has a rectangular cross-section complementary to the recess 135A. Therefore, the protrusion 146A can be firmly fitted into the recess 135A.

<Third Embodiment>

The concave portion engaging with the retainer may also be formed on the rolling surface. In this case, the inner race may not have an extended surface. As a result, the tapered roller bearing is reduced in weight. In the third embodiment, an exemplary tapered roller bearing having recesses formed on the rolling surface will be described.

Fig. 4 is a schematic partial cross-sectional view of a tapered roller bearing 100B according to a third embodiment. The tapered roller bearing 100B will be described with reference to FIG. 4. The description of the second embodiment can be used for the elements assigned the same symbols as those of the second embodiment.

As in the second embodiment, the tapered roller bearing 100B includes: a plurality of tapered rollers 110 (FIG. 4 shows one of the plurality of tapered rollers 110), the outer race 120, and the retainer 140. The description of the second embodiment can be applied to these requirements.

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 can be applied to the flange portion 134.

The inner race 130B further includes a rolling surface 132B. The circumferential surface 113 of the tapered roller 110 abuts against the rolling surface 132B. The tapered roller 110 rotates around the rotation axis AX2 and rolls on the rolling surface 132B. The flange portion 134 projects from the rolling surface 132B toward the outer race 120. In this embodiment, the inner rolling surface is exemplified by the rolling surface 132B.

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

The inner race 130B includes a front end surface 138. The front end surface 138 is at a right angle with respect to the rotation axis AX1, and an annular band area is formed on an imaginary plane (not shown) defined in a manner including the front end edge 137.

Unlike the second embodiment, the recess 135B to which the protrusion 146A of the holder 140 engages is located near the front end edge 137 and is recessed on the rolling surface 132B. The recess 135B is formed corresponding to the protrusion 146A. The recess 135B has a longitudinal cross section of a substantially rectangular shape. The protrusion 146A has a rectangular cross section that is complementary to the recess 135B. Therefore, the protrusion 146A can be firmly fitted into the recess 135B.

The protrusion direction of the protrusion 146A from the main wheel 145 is substantially at a right angle with respect to the extending direction of the rotation axis AX1. Similarly, the direction in which the recessed portion 135B is formed from the rolling surface 132B is substantially at right angles to the extending direction of the rotation axis AX1. Therefore, the protrusion 146A can fit into the recess 135B appropriately.

<Fourth Embodiment>

The recessed direction of the recessed portion recessed on the rolling surface may also be at right angles to the rotation axis of the tapered roller. In this case, the projecting direction of the protrusion engaged with the recess is also set at a right angle with respect to the rotation axis of the tapered roller. In the fourth embodiment, an exemplary tapered roller bearing having an engagement structure that is recessed and protruded in a direction perpendicular to the rotation axis of the tapered roller will be described.

Fig. 5 is a schematic partial cross-sectional view of a tapered roller bearing 100C according to a fourth embodiment. The tapered roller bearing 100C will be described with reference to FIG. 5. The description of the third embodiment can be used for the requirements assigned with the same symbols as those of the third embodiment.

As in the third embodiment, the tapered roller bearing 100C includes a plurality of tapered rollers 110 (FIG. 5 shows one of the plurality of tapered rollers 110) and an outer race 120. The description of the third embodiment can be applied to these requirements.

The tapered roller bearing 100C further includes an inner race 130C and a cage 140C. As in the third embodiment, the inner race 130C includes a flange portion 134 and a front end surface 138. The description of the third embodiment can be applied to these requirements. As in the third embodiment, the holder 140C includes a second regulating wheel 142 and a plurality of connecting pieces 143 (FIG. 5 shows one of the plurality of connecting pieces 143). The description of the third embodiment can be applied to these requirements.

The inner race 130C further includes a rolling surface 132C. As in the third embodiment, the rolling surface 132C includes a base end edge 136 and a front end edge 137. The description of the third embodiment can be applied to these requirements.

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

The recess 135C is located near the front end edge 137 and is recessed on the rolling surface 132C. The recess 135C has a substantially rectangular cross-section. The recessed portion 135C from the rolling surface 132C is recessed at a substantially right angle with respect to the extending direction of the rotation axis AX2.

The holder 140C includes a first regulating wheel 141C. As in the third embodiment, the first regulated wheel 141C includes a main wheel 145. The description of the third embodiment can be applied to the main wheel 145.

The first regulation wheel 141C further includes at least three protrusions 146C (Figure 5 shows one of the at least three protrusions 146C). The protrusion 146C protrudes from the inner circumference of the main wheel 145 in a direction at a right angle to the rotation axis AX2. The recess 135C is formed corresponding to the protrusion 146C. Therefore, the protrusion 146C can fit into the recess 135C appropriately. In addition, the protrusion 146C has a rectangular longitudinal section that is complementary to the recess 135C. Therefore, the protrusion 146C can be firmly fitted into the recess 135C.

The design principles explained in connection with the various embodiments described above can be applied to various tapered roller bearings. One of the various features described in connection with one of the various embodiments described above can also be applied to the tapered roller bearing described in connection with the other embodiment.

In the above embodiment, the retainer is installed on the inner race. However, the same mounting structure can also be applied to the outer race. In addition, the retainer 140 restricts the displacement of the tapered roller 110 in the first direction and the second direction only at the time of assembly. After assembly, the first regulating wheel 141 and the second regulating wheel 142 can be set in a non-contact state. Similarly, after assembling, the recess and the protrusion may be in a non-contact state. In addition, the retainer engages with the recessed portion by the protrusion to perform the assembly operation in a state of hooking the inner race or the outer race while retaining the roller. In addition, the bottom surface of the recess shown in FIG. 1 may be formed in an arc shape in cross section, or the protrusion may be formed in an arc shape along the cross section.

The roller bearing explained in connection with the above-mentioned embodiment mainly has the following characteristics.

The roller bearing of one aspect of the above-mentioned embodiment has a roller that is inclined with respect to the rotation axis. Roller that rotates on the sub-axis. The roller bearing includes: an outer race, which has an outer rolling surface on which the rollers roll; an inner race, which is surrounded by the outer race to determine the rotation shaft; and a retainer, which is arranged on the outer race and The displacement of the roller in the extending direction of the roller shaft is restricted between the inner races during assembly. The roller includes a first end surface and a second end surface located radially outward from the first end surface. The retainer includes a regulating wheel that abuts against the first end surface during assembly to restrict the displacement of the roller. The retainer is connected to at least one of the inner race or the outer race on the first end surface side.

According to the above configuration, since the regulated gear train of the cage abuts on the first end surface, the cage can appropriately restrict the displacement of the roller. Since the flange portion on the first end surface side of a general roller bearing is not necessary, the roller can have a large size in the extending direction of the roller shaft. Since the retainer that abuts on the first end surface and restricts the displacement of the roller is connected to at least one of the inner race or the outer race, the retainer does not increase the axial length of the outer race and/or the inner race The size is appropriately fixed in the space enclosed by the outer race and/or the inner race. Therefore, long rollers can be assembled into roller bearings without increasing the shaft length of the roller bearing itself.

Regarding the above configuration, the inner race may also include an opposing surface facing the outer rolling surface. The retainer may also include a protrusion that is engaged with a concave portion recessed in the opposing surface.

According to the above-mentioned configuration, since the retainer includes the protrusion that is engaged with the recess formed on the opposed surface of the inner race facing the outer rolling surface, the retainer can be appropriately held on the opposed surface. Since the engagement structure formed by the recess and the protrusion is constructed in the space surrounded by the outer race and/or the inner race, the long roller can be assembled without increasing the shaft length of the roller bearing itself Into the roller bearing. Even if the recess is formed, the end of the inner race on the first end face side is located on the second end face side in the axial direction of the outer race. Even if the recess is formed, the end of the inner race on the first end face side does not protrude, and the shaft length of the roller bearing itself does not increase.

Regarding the above configuration, the recess may be a sheave formed on the opposing surface so as to surround the rotation axis. The protrusion may also be a cam wheel that is engaged with the sheave wheel.

According to the above-mentioned structure, since the projection is engaged with the cam wheel of the sheave formed on the opposite surface so as to surround the aforementioned rotation axis, the retainer is firmly fixed on the opposite surface. Therefore, the retainer can appropriately restrict the displacement of the roller toward the smaller diameter side.

Regarding the above configuration, the opposing surface may include an inner rolling surface on which the roller rolls, and an extended surface extending from the inner rolling surface in the extending direction of the rotation axis. The sheave may also be formed along the boundary between the inner rolling surface and the extended surface.

According to the above configuration, since the grooved wheel train is formed along the boundary between the inner rolling surface and the extended surface, the manufacturer of the inner race can use the necking process to form the grooved wheel. Therefore, the roller bearing can be formed without additional and/or special processing for forming the sheave.

Regarding the above configuration, the opposing surface may include an inner rolling surface on which the roller rolls, and an extended surface extending from the inner rolling surface in the extending direction of the rotation axis. The said recessed part may be formed in the said extended surface.

According to the above configuration, since the recess is formed on the extended surface, the retainer can be easily mounted on the inner race.

Regarding the above configuration, the opposed surface may also be an inner rolling surface on which the roller rolls. The said recessed part may be formed in the said inner rolling surface.

According to the above-mentioned structure, since the recessed portion is formed on the inner rolling surface, the above-mentioned extended surface is not necessary. Therefore, the roller bearing is lightweight.

Regarding the above-mentioned structure, the aforementioned regulation wheel may also include a main wheel including a regulation surface facing the first end surface. The protrusion may be a protrusion protruding from the main wheel in a direction at a right angle with respect to the roller shaft.

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

Regarding the above-mentioned structure, the aforementioned regulation wheel may also include a main wheel including a regulation surface facing the first end surface. The protrusion may be a protrusion protruding from the main wheel in a direction at a right angle to the rotation axis.

According to the above configuration, since the protrusion protrudes from the main wheel in a direction at a right angle with respect to the rotating shaft (the rotating shaft is inclined with respect to the roller shaft), the component of the force acting on the extending direction of the roller shaft is Acts to strengthen the direction of engagement between the cam and the sheave. Therefore, the protrusion is not easily detached from the sheave.

[Industrial availability]

The principles of the above-mentioned embodiments can be suitably used in various technical fields using tapered roller bearings.

100: Tapered roller bearing (roller bearing)

110: Tapered roller (roller)

111: first end face

112: 2nd end face

113: Surround

120: Outer seat ring

121: rolling surface

130: inner seat ring

131: Face/Opposite

132: rolling surface

133: extended surface

134: Flange

135: groove wheel

140: retainer

141: First Regulation Round

142: Second Regulation Round

144: Dimple

145: Main Wheel

146: Came

147: Regulations

AX1: Rotation axis

AX2: Rotation axis

P1: Center

P2: Center

Claims (7)

A roller bearing, which has rollers that rotate around a roller shaft that is inclined with respect to the rotation axis; and is provided with: an outer race having an outer rolling surface on which the aforementioned rollers roll; an inner race, which is covered by the aforementioned outer race The race is surrounded; and the retainer is arranged between the outer race and the inner race to limit the displacement of the roller in the extending direction of the roller shaft; and the roller includes a first end surface And a second end surface located on the radially outer side of the first end surface; and the retainer includes a regulating wheel that restricts the displacement of the roller; the regulating wheel includes a main wheel that abuts against the aforementioned The first end surface restricts the displacement of the roller; the retainer is connected to the inner race on the side of the first end surface; the inner race includes a pair opposed to the outer rolling surface and recessed Toward the surface; the retainer includes a protrusion that protrudes from the inner periphery of the main wheel and is engaged with the recess; the protrusion has a shape whose tip becomes thinner as it moves away from the main wheel. The roller bearing of claim 1, wherein the concave portion is formed on the sheave of the opposing surface so as to surround the rotation axis, and the protrusion is engaged with the sheave of the sheave. The roller bearing of claim 2, wherein the opposed surface includes an inner rolling surface on which the roller rolls, and an extended surface extending from the inner rolling surface to the extending direction of the rotating shaft, and the grooved gear train is along The boundary between the inner rolling surface and the extended surface is formed. The roller bearing of claim 1, wherein the opposed surface includes an inner rolling surface on which the roller rolls, and an extended surface extending from the inner rolling surface to the extending direction of the rotating shaft, and the recess is formed in the Extend the surface. The roller bearing of claim 1, wherein the opposed surface is an inner rolling surface on which the roller rolls, and the recess is formed on the inner rolling surface. The roller bearing of claim 5, wherein the regulation wheel includes a main wheel, the main wheel includes a regulation surface facing the first end surface, and the protrusion is at right angles to the roller shaft from the main wheel The direction of the protrusion protruding. Such as the roller bearing of claim 5, wherein the regulation wheel includes a main wheel, the main wheel includes a regulation surface facing the first end surface, and the protrusion is a right angle from the main wheel to the axis of rotation Protruding direction.

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