JP2021179232A - Holder, bearing and speed reducer - Google Patents

Abstract

To prevent damage of a holder due to skew force.SOLUTION: A cage 1 of a bearing 1A that holds a plurality of rolling elements 2 around a central axis F3, comprises: a side peripheral part 1a in which the plurality of rolling elements are stored along the circumference of the central axis; annulus plate-shaped end face parts 1b, 1c arranged from end parts 1a1,1a2 in the central axis direction of the side peripheral part toward a radial direction of the central axis; and reinforcing parts 1d, 1e arranged on the end face parts.SELECTED DRAWING: Figure 2

Description

The present invention relates to a cage, a bearing, and a speed reducer.

In industrial robots, machine tools, etc., a speed reducer equipped with needle bearings may be used. In the needle bearing, a large number of rolling elements (rollers) held in the through window (opening) of the cage are sandwiched between the inner race and the outer race to form a bearing. In the cage, a plurality of through windows (openings) are arranged in the circumferential direction with respect to the central axis of the bearing. In the cage, a pillar portion is formed between adjacent through windows (openings).

In the speed reducer RV, the roller filling rate of the needle bearing used for the crankshaft portion tends to increase as the output density increases. Especially in the eccentric swing type speed reducer, the tendency of increasing the roller filling rate is remarkable.

Japanese Patent No. 2628674

However, as the roller filling rate increases, the number of through windows (openings) into which the rollers are inserted increases in the cage. Therefore, in the circumferential direction of the central axis, the distance between the adjacent through windows (openings) becomes small, and the circumferential dimension of the pillar portion becomes small. This may reduce the strength of the cage.

In a speed reducer used in a robot or the like, skewers occur in the rollers of the needle bearing. The roller may tilt due to this skewer.
When the roller of the needle bearing is tilted, it collides with the contour of the through window (opening) of the cage with the roller tilted. Then, the roller collides with the end face side along the central axis and the pillar side in the circumferential direction of the central axis in the contour of the through window (opening). As a result, stress concentration occurs at the base R portion of the pillar portion, which is a corner in the contour of the through window (opening) of the cage.

Here, in a cage having a reduced strength, there may be a problem that the vicinity of the through window of the cage is broken due to stress concentration.

It is an object of the present invention to provide a cage, a bearing, and a speed reducer capable of preventing the occurrence of damage due to a skewer with a simple configuration, which provides a structure capable of improving the strength of the needle bearing cage. It is a thing.

The cage according to one aspect of the present invention is
A bearing cage that holds multiple rolling elements around the central axis.
A side peripheral portion in which a plurality of the rolling elements are housed along the circumference of the central axis, and
An annular plate-shaped end face portion arranged at the end portion of the side peripheral portion in the radial direction of the central axis, and
Reinforcing part arranged on the end face part and
With,
This solved the above problem.

According to the cage according to one aspect of the present invention, when the rolling element is tilted with respect to the central axis and comes into contact with the side peripheral portion due to the skew force, the strength of the side peripheral portion is improved by the reinforcing portion. , It is possible to prevent damage to the cage.

The cage according to one aspect of the present invention is
In the above cage
The reinforcing portion is formed in an annular shape.
be able to.

The cage according to one aspect of the present invention is
In the above cage
The reinforcing portion is formed integrally with the end face portion and is a thick portion thicker than the thickness of the end face portion in the direction along the central axis.
be able to.

The cage according to one aspect of the present invention is
In the above cage
The reinforcing portion and the end portion of the rolling element can come into contact with each other in a direction along the central axis.
be able to.

The cage according to one aspect of the present invention is
In the above cage
The side peripheral portion includes the end face portions at both ends in a direction along the central axis.
be able to.

The cage according to one aspect of the present invention is
In the above cage
The reinforcing portion is formed on the facing surface of the end face portion.
be able to.

The cage according to one aspect of the present invention is
In the above cage
The end face portion and the reinforcing portion can be integrally molded by press working.

The cage according to one aspect of the present invention is
A bearing cage that holds multiple rolling elements around the central axis.
A side peripheral portion having a rectangular opening space in which a plurality of the rolling elements are housed along the circumference of the central axis.
An annular plate-shaped end face portion arranged from the end portion of the side peripheral portion in the direction along the central axis toward the radial direction of the central axis, and
A restricting portion that protrudes from the end face forming the contour of the opening space closer to the rolling element in the lateral peripheral portion.
Have,
This solved the above problem.

According to the cage according to one aspect of the present invention, when the rolling element is tilted with respect to the central axis due to the skew force, it abuts on the regulating portion and does not directly abut on the opening space. As a result, stress is not concentrated on the corners of the opening space contour of the side peripheral portion. Therefore, damage to the cage can be prevented.

The cage according to one aspect of the present invention is
In the above cage
The regulation part is formed integrally with the end face part,
The restricting portion is integrally formed with the end face portion, and is arranged at a position close to the rolling element along the central axis direction from the inner circumference of the end face portion.
be able to.

The cage according to one aspect of the present invention is
In the above cage
The end face portion and the regulation portion can be integrally molded by press working.

The cage according to one aspect of the present invention is
In the above cage
The end portion of the contour of the opening space seen in the radial direction of the central axis in the direction along the central axis, and the end portion of the rolling element visible from the opening space in the direction along the central axis. But are separated from each other,
be able to.

The cage according to one aspect of the present invention is
In the above cage
The side peripheral portion includes the end face portions at both ends in the central axis direction.
be able to.

The cage according to one aspect of the present invention is
In the above cage
The restricting portion is formed on the opposite surface of the end face portion.
be able to.

The bearing according to another aspect of the present invention is
An outer race that is formed in an annular shape and has an abduction surface that faces inward in the radial direction.
An inner race that is arranged coaxially with the outer race and has an inward rolling surface that faces outward in the radial direction.
A plurality of rolling elements that roll on the adduction surface and the abduction surface, and
The cage according to any one of the above, which holds a plurality of the rolling elements.
Have,
be able to.

The speed reducer according to another aspect of the present invention is
An outer cylinder with internal teeth arranged along the circumferential direction formed on the inner peripheral surface,
An eccentric swing gear having external teeth that mesh with the internal teeth of the outer cylinder, a crank shaft connected to a drive source to swing the eccentric swing gear, and the like.
A carrier that supports the crank shaft and rotates relative to the outer cylinder,
Equipped with
The crank shaft can be supported by the carrier by the bearing.

According to the present invention, it is possible to provide a cage, a bearing, and a speed reducer capable of preventing the occurrence of damage due to a skewer with a simple configuration, which provides a structure capable of improving the cage strength in a needle bearing. It becomes possible to play an effect.

It is a front view which showed the 1st Embodiment of the cage and the bearing which concerns on this invention, and was partially cross-sectionally viewed in the direction of the central axis. It is sectional drawing in the direction coincide with the central axis which shows the 1st Embodiment of the cage which concerns on this invention. It is a side view in the direction orthogonal to the central axis which shows the 1st Embodiment of the cage which concerns on this invention. FIG. 5 is a schematic enlarged view showing specifications in a cross section in a direction coincide with the central axis in the first embodiment of the cage according to the present invention. It is sectional drawing in the direction coincide with the central axis which shows the 2nd Embodiment of a cage, a bearing, and a speed reducer which concerns on this invention. It is sectional drawing in the direction coincide with the central axis which shows the 3rd Embodiment of the cage which concerns on this invention.

Hereinafter, the first embodiment of the cage, bearing, and speed reducer according to the present invention will be described with reference to the drawings.
FIG. 1 is a front view showing a cage and a bearing in the present embodiment in a partial cross-sectional view in the direction of the central axis. FIG. 2 is a side sectional view along a central axis showing the cage in the present embodiment. FIG. 3 is a side view seen from the outside in the direction orthogonal to the central axis showing the cage in the present embodiment. FIG. 4 is a schematic view along the central axis showing the dimensions of the cage in the present embodiment.
In the figure, reference numeral 1 is a cage.

As shown in FIGS. 1 to 3, the cage 1 according to the present embodiment is used for a bearing that holds a plurality of rolling elements (rollers) 2 around the central axis F3.
As shown in FIGS. 1 to 3, the cage 1 according to the present embodiment has an opening space 1p as a through window in which a plurality of rolling elements (rollers) 2 are housed along the circumference of the central axis F3. Circular plate-shaped end face portions 1b, 1c and end face portions 1b, 1c arranged from both end portions 1a1, 1a2 in the central axis F3 direction of the peripheral portion 1a and the side peripheral portion 1a toward the radial direction of the central axis F3. Reinforcing portions 1d and 1e arranged in the above are provided.

In other words, the cage 1 has a side peripheral portion 1a forming a substantially cylindrical surface having a diameter larger than the pitch circle diameter of the roller arrangement, and both end portions 1a1 in the central axis F3 direction of the annular side peripheral portion 1a. A plurality of flange-shaped end face portions 1b and 1c protruding inward in the radial direction from 1a2 and a plurality of flange-shaped end face portions 1b and 1c are formed side by side in the circumferential direction on the cylindrical surface of the side peripheral portion 1a to form a pillar portion between them. The opening space 1p, which is a plurality of pockets for the rollers 2 to enter, and the convex portions (protrusions) 1d, 1e, which are the regulating portions (reinforcing portions) for positioning at the end faces of the rollers 2 in the direction of the central axis F3, are provided. Have.

As shown in FIGS. 1 to 3, the rolling element (roller) 2 has a substantially columnar outer shape. The rolling element (roller) 2 has an axis F4 parallel to the central axis F3. The plurality of rolling elements (rollers) 2 are arranged around the central axis F3 so that the axes F4 are parallel to each other. The plurality of rolling elements (rollers) 2 are arranged so as to be equidistant from each other with respect to the circumferential direction of the central axis F3. The cage 1 rotatably holds the plurality of rolling elements (rollers) 2 while moving in the circumferential direction of the central axis F3 in such a state.

The side peripheral portion 1a forms a substantially cylindrical surface around the central axis F3. The width dimension T1a (see FIG. 4) of the side peripheral portion 1a in the direction along the central axis F3 is substantially the same on the entire circumference around the central axis F3. The side peripheral portion 1a has a thickness dimension Ta (see FIG. 4) in the direction along the central axis F3, which is substantially the same on the entire circumference around the central axis F3.

The side peripheral portion 1a has a distance from the central axis F3, that is, a radial dimension, which is substantially equal to the total length in the direction along the central axis F3.
The shape of the side peripheral portion 1a is not limited to the shape described above, and can be deformed according to the shape of the bearing to be housed.
A plurality of opening spaces 1p are formed in the circumferential direction of the side peripheral portion 1a. A plurality of opening spaces 1p are provided in the circumferential direction of the side peripheral portion 1a. The opening space 1p is a storage position for the roller (rolling element) 2.

As shown in FIGS. 1 to 3, the opening space 1p has a substantially rectangular contour shape when viewed from the radial outside of the side peripheral portion 1a.
The opening space 1p is formed so that the dimension Tp (see FIG. 4) in the direction along the central axis F3 is larger than the length dimension T2 (see FIG. 4) of the roller (rolling element) 2 in the direction along the central axis F3. Will be done.
The opening space 1p is formed so that the dimension in the circumferential direction of the central axis F3 is larger than the length dimension of the roller (rolling element) 2 in the direction orthogonal to the central axis F3.

The side peripheral portion 1a is provided with a flange-shaped end face portion 1b projecting inward in the radial direction with respect to the central axis F3 at the end portion 1a1 in the central axis F3 direction. Further, the side peripheral portion 1a is provided with a flange-shaped end face portion 1c protruding inward in the radial direction with respect to the central axis F3 at the end portion 1a2 in the central axis F3 direction.

As shown in FIGS. 1 to 3, the end face portions 1b and 1c are annular plates (annular plate shape) extending in a direction orthogonal to the central axis F3. The end face portions 1b and 1c have substantially the same contour shape when viewed from the central axis F3. The end face portions 1b and 1c are formed so as to be orthogonal to the side peripheral portion 1a.
The end face portions 1b and 1c have substantially the same outer diameter dimension all around the central axis F3. The end face portions 1b and 1c have substantially the same inner diameter dimension all around the central axis F3.
The end face portions 1b and 1c have substantially the same radial dimensions all around the central axis F3.
The radial dimension of the end face portions 1b and 1c with respect to the central axis F3 is set to be larger than the radial dimension around the axis F4 of the roller (rolling element) 2. The radial dimension of the end face portions 1b and 1c with respect to the central axis F3 may be smaller than the radial dimension around the axis F4 of the roller (rolling element) 2.

The end face portion 1b has a thickness dimension Tb (see FIG. 4) in the direction along the central axis F3, which is substantially the same on the entire circumference around the central axis F3. The end face portion 1b has a thickness dimension Tb (see FIG. 4) in the direction along the central axis F3, which is substantially the same as the total length along the radial direction of the central axis F3.
The end face portion 1c has a thickness dimension Tc (see FIG. 4) in the direction along the central axis F3, which is substantially the same on the entire circumference around the central axis F3. The end face portion 1c has a thickness dimension Tc (see FIG. 4) in the direction along the central axis F3, which is substantially the same as the total length along the radial direction of the central axis F3.

The thickness dimension Tb of the end face portion 1b (see FIG. 4) and the thickness dimension Tc of the end face portion 1c (see FIG. 4) are both formed equally. The thickness dimension Tb of the end face portion 1b (see FIG. 4) and the thickness dimension Tc of the end face portion 1c (see FIG. 4) are both set to be equal to the thickness dimension Ta of the side peripheral portion 1a (see FIG. 4). Will be done.

As shown in FIGS. 1 to 3, the end face portion 1b has a convex portion (protrusion) 1d that serves as a restricting portion or a reinforcing portion at a position facing the end face portion 1c at the inner end portion in the radial direction with respect to the central axis F3. Is formed. The end face portion 1c has a convex portion (protrusion) that serves as a regulating portion or a reinforcing portion at a position facing the end face portion 1b at the radial inner end portion with respect to the central axis F3, corresponding to the convex portion (protrusion) 1d. ) 1e is formed. The convex portions (protrusions) 1d and 1e are formed on the surfaces of the end face portions 1b and the end face portions 1c facing each other.

The convex portions (protrusions) 1d and 1e that serve as the restricting portion or the reinforcing portion are formed continuously in an annular shape around the entire circumference of the central axis F3, respectively. The convex portions (protrusions) 1d and 1e are formed as a restricting portion or a reinforcing portion as thick portions thicker than the thickness in the direction along the central axis F3 in the end face portions 1b and 1c, respectively.
The convex portion (protrusion) 1d serving as the regulating portion or the reinforcing portion is integrally formed with the end face portion 1b. The convex portion (protrusion) 1e serving as the regulating portion or the reinforcing portion is integrally formed with the end face portion 1c.

The convex portion (protrusion) 1d serving as the restricting portion or the reinforcing portion has a width dimension Td (see FIG. 4) along the radial direction of the central axis F3 that is substantially the same all around the central axis F3. The convex portion (protrusion) 1e that serves as the restricting portion or the reinforcing portion has a width dimension Te (see FIG. 4) along the radial direction of the central axis F3 that is substantially the same all around the central axis F3.

What is the width dimension Td (see FIG. 4) of the convex portion (protrusion) 1d that becomes the regulation portion or the reinforcing portion and the width dimension Te (see FIG. 4) of the convex portion (protrusion) 1e that becomes the regulation portion or the reinforcing portion? , Both are formed equally.
What is the width dimension Td (see FIG. 4) of the convex portion (protrusion) 1d that becomes the regulation portion or the reinforcing portion and the width dimension Te (see FIG. 4) of the convex portion (protrusion) 1e that becomes the regulation portion or the reinforcing portion? , Both are formed to be equal to the thickness dimension Ta (see FIG. 4) of the side peripheral portion 1a.

The convex portion (protrusion) 1d serving as the restricting portion or the reinforcing portion can be visually recognized from the opening space 1p when viewed from the radial outside with respect to the central axis F3. That is, the convex portion (protrusion) 1d serving as the regulating portion or the reinforcing portion protrudes toward the center side of the opening space 1p from the end face 1p1 which is the contour of the opening space 1p in the direction along the central axis F3. ..
The convex portion (protrusion) 1e serving as the restricting portion or the reinforcing portion can be visually recognized from the opening space 1p when viewed from the radial outside with respect to the central axis F3. That is, the convex portion (protrusion) 1e serving as the regulating portion or the reinforcing portion protrudes toward the center side of the opening space 1p from the end face 1p1 which is the contour of the opening space 1p in the direction along the central axis F3. ..

The distance Tde (see FIG. 4) between the convex portion (projection) 1d and the convex portion (projection) 1e in the direction along the central axis F3 is the contour of the opening space 1p in the direction along the central axis F3. It is smaller than the distance Tp (see FIG. 4) between a pair of parallel sides facing each other. Similarly, in the direction along the central axis F3, the distance Tde (see FIG. 4) between the convex portion (projection) 1d and the convex portion (projection) 1e is a rolling element in the direction along the central axis F3. The length of (roller) 2 is set to be substantially equal to or slightly larger than the length T2 (see FIG. 4).
The difference between the distance Tde (see FIG. 4) and the distance Tp (see FIG. 4) is set to be equal to the total length of one side extending in the circumferential direction with respect to the central axis F3 in the opening space 1p which is a rectangular contour.

The difference between the distance Tde (see FIG. 4) and the length T2 (see FIG. 4) is set to be equal to the total length of one side of the opening space 1p which is a rectangular contour in the circumferential direction with respect to the central axis F3.
The end faces of the convex portions (protrusions) 1d and the convex portions (protrusions) 1e facing each other are parallel in the direction orthogonal to the central axis F3. The end faces of the convex portions (protrusions) 1d and the convex portions (protrusions) 1e facing each other are subjected to surface treatment such as smoothing and deburring.

The end faces of the convex portion (projection) 1d and the convex portion (projection) 1e maintain the same distance Tde (see FIG. 4) in the radial direction with respect to the central axis F3. That is, the end faces of the convex portion (protrusion) 1d and the convex portion (protrusion) 1e maintain the same distance Tde (see FIG. 4) in the thickness direction thereof.
The end faces of the convex portion (protrusion) 1d and the convex portion (protrusion) 1e maintain the same distance Tde (see FIG. 4) in the circumferential direction with respect to the central axis F3. That is, the end faces of the convex portion (protrusion) 1d and the convex portion (protrusion) 1e maintain the same distance Tde (see FIG. 4) in the circumferential direction with respect to the central axis F3.

The end faces of the convex portion (protrusion) 1d and the convex portion (protrusion) 1e can be positioned closer to the central axis F3 than the axis F4 in the radial direction with respect to the central axis F3. Alternatively, the end faces of the convex portion (protrusion) 1d and the convex portion (protrusion) 1e can be positioned to include the axis F4 in the radial direction with respect to the central axis F3.

The cage 1 in the present embodiment is provided with a plurality of side peripheral portions 1a along the circumferential direction around the central axis F3 and a plurality of lateral peripheral portions 1a in the circumferential direction to serve as storage positions for the rollers (rolling elements) 2. 1p, flange-shaped end face portions 1b, 1c protruding inward in the radial direction from the end portions 1a1, 1a2 in the direction along the central axis F3 of the side peripheral portion 1a, and the central axis of the end face portions 1b, 1c. It is provided with convex portions (reinforcing portion, restricting portion) 1d, 1e protruding in the direction along the central axis F3 from the inner peripheral end portion in the radial direction with respect to F3 toward the center of the contour of the opening space 1p, and the convex portion (convex portion). Reinforcing portion, regulating portion) 1d, 1e project toward the center of the contour of the opening space 1p from the side 1p1 of the opening space 1p, which is a rectangular contour, in the direction along the central axis F3.

Next, a method of forming the cage in the present embodiment will be described.

The method for forming the cage 1 in the present embodiment is integrally molded from a plate material by press working. At this time, in the formation of the cage 1, the side peripheral portions 1a and the end face portions 1b and 1c are bent so that the radial cross section with respect to the central axis F3 is substantially U-shaped, and the peripheral portions with respect to the central axis F3 are connected. And form an annular shape.
Further, in the end face portions 1b and 1c, the inner peripheral side end portions with respect to the central axis F3 are bent in a direction facing each other and close to each other to form convex portions (reinforcing portion, restricting portion) 1d and 1e.

Further, the end faces of the convex portions (reinforcing portion, regulating portion) 1d and 1e are subjected to surface treatment such as deburring.
In this way, the cage 1 is formed as a C shape whose radial cross section with respect to the central axis F3 is close to a substantially rectangular shape.

The order of bending, the order of surface treatment, and the like may be appropriately set from the viewpoint of ease of processing, and are not limited to the above order.

The state of the cage 1 and the roller (rolling body) 2 in the present embodiment will be described.

Here, consider a case where the roller (rolling element) 2 is tilted so that the axis F4 is tilted and the center axis F3 is tilted in the cage 1.
Here, the cage 1 is used as a bearing. Therefore, as shown in FIG. 1, the outer race Or is located outside the cage 1 in the radial direction with respect to the central axis F3. Further, as shown in FIG. 1, the inner race Ir is located inside the cage 1 in the radial direction with respect to the central axis F3.
Therefore, it is sufficient to consider the state in which the roller (rolling element) 2 is tilted along the circumferential direction with respect to the central axis F3.

As described above, in the cage 1 of the present embodiment, when the roller (rolling body) 2 is tilted so that the axis F4 is tilted and tilted with respect to the central axis F3, the end face of the roller (rolling body) 2 is subjected to. First, the convex portions (reinforcing portion, regulating portion) 1d and 1e come into contact with each other. In this state, the roller (rolling element) 2 does not come into contact with the side of the rectangular contour of the opening space 1p. Therefore, no stress is generated in the side peripheral portion 1a near the contour of the opening space 1p due to the contact of the rollers (rolling elements) 2. In particular, the roller (rolling element) 2 does not come into contact with the vicinity of the corner of the rectangular contour in the opening space 1p, and stress concentration does not occur.

Further, when the roller (rolling body) 2 is tilted in this way and the roller (rolling body) 2 first comes into contact with the convex portions (reinforcing portion, regulating portion) 1d, 1e, the convex portion (reinforcing portion, regulating portion) is further contacted. Part) The end face parts 1b and 1c are deformed so that 1d and 1e are separated from each other in the central axis F3 direction. That is, the end face portion 1b and the end face portion 1c are deformed so as to be separated from each other. At this time, in the end face portion 1b and the end face portion 1c, the inner peripheral side in which the convex portion (reinforcing portion, regulating portion) 1d and the convex portion (reinforcing portion, regulating portion) 1e are formed is along the central axis F3. It is deformed so as to be separated in the vertical direction. On the other hand, the end face portion 1b and the end face portion 1c are suppressed from being deformed on the outer peripheral side connected to the side peripheral portion 1a.

This makes it possible to prevent the occurrence of stress concentration in the side peripheral portion 1a. Further, when the filling rate of the rollers is increased, it is possible to prevent the occurrence of damage even in the side peripheral portion 1a which is thinned and the strength is lowered. Further, the life of the cage 1 can be extended.

Further, consider a case where the roller (rolling element) 2 moves along the central axis F3 along the central axis F3, although the axis F4 does not incline due to the action of the skew force in the cage 1.

As described above, in the cage 1 of the present embodiment, when the roller (rolling body) 2 moves along the central axis F3 without tilting the axis F4, the roller (rolling body) 2 is first moved to the end surface of the roller (rolling body) 2. The convex portions (reinforcing portion, regulating portion) 1d and 1e come into contact with each other. In this state, the roller (rolling element) 2 does not come into contact with the side of the rectangular contour of the opening space 1p. Therefore, no stress is generated in the side peripheral portion 1a near the contour of the opening space 1p due to the contact of the rollers (rolling elements) 2.

Further, when the roller (rolling body) 2 moves in this way and the roller (rolling body) 2 first comes into contact with the convex portion (reinforcing portion, regulating portion) 1d or the convex portion (reinforcing portion, regulating portion) 1e. The end face portion 1b or the end face portion 1c is deformed so that the convex portions (reinforcing portion, regulating portion) 1d and 1e are separated from each other in the central axis F3 direction. That is, the end face portion 1b and the end face portion 1c are deformed so as to be separated from each other. At this time, in the end face portion 1b and the end face portion 1c, the inner peripheral side in which the convex portion (reinforcing portion, regulating portion) 1d and the convex portion (reinforcing portion, regulating portion) 1e are formed is along the central axis F3. It is deformed so as to be separated in the vertical direction. On the other hand, the end face portion 1b and the end face portion 1c are suppressed from being deformed on the outer peripheral side connected to the side peripheral portion 1a.

As a result, the cage 1 of the present embodiment can prevent the occurrence of stress concentration in the side peripheral portion 1a, prevent the occurrence of breakage, and extend the life. Therefore, since it is not necessary to increase the curvature R formed at the corner of the contour of the opening space 1p to maintain the strength, the gap between the cage 1 and the rolling element 2 can be reduced, and the size can be reduced.
Further, the cage 1 of the present embodiment can be manufactured at low cost by reducing the number of forming steps, reducing the number of formed parts, and having a simple structure that can be integrally molded by bending four threads. It is possible to do.

In the cage 1 of the present embodiment, the dimensions shown in FIG. 4 can be set so as to satisfy the respective relationships as shown below.
T2 ≤ Tde
Tde <Tp
Tp <Tbc
Tbc <T1a
Td = Te = Tb = Tc = Ta

Next, the bearing in this embodiment will be described.

As shown in FIG. 1, the bearing 1A in the present embodiment has the above-mentioned cage 1, a plurality of rolling elements (rollers) 2, an outer race Or, and an inner race Ir.
The bearing 1A has the center axis F3 as the center of rotation.
The outer race Or is formed in an annular shape and has an abduction surface facing inward in the radial direction with respect to the central axis F3.

The inner race Ir is arranged coaxially with the outer race Or and has an inward rolling surface facing outward in the radial direction with respect to the central axis F3.
In addition, in FIG. 1, the outer race Or and the inner race Ir show only the positions of the respective rolling surfaces.
The plurality of rolling elements (rollers) 2 roll on the adduction surface and the abduction surface.

As described above, the bearing 1A in the present embodiment can prevent stress concentration in the cage 1 and suppress damage. Therefore, it is possible to prevent damage to the bearing 1A, extend the service life, and reduce the size.

Hereinafter, a second embodiment of the cage, bearing, and speed reducer according to the present invention will be described with reference to the drawings.
FIG. 5 is a cross-sectional view of a cage, a bearing, and a speed reducer according to the present embodiment along the axial direction. In the figure, reference numeral 100 is a speed reducer. In the present embodiment, the difference from the above-mentioned first embodiment is that the speed reducer is the same, and the same reference numerals are given to the configurations corresponding to the other above-mentioned first embodiments, and the description thereof will be omitted. ..

As shown in FIG. 5, the speed reducer 100 according to the present embodiment includes a housing cylinder 200, a gear portion (external tooth member) 300, and three crank assemblies 400. The housing cylinder 200 accommodates the gear portion 300 and the three crank assemblies 400.
In the present embodiment, the speed reducer 100 is an eccentric swing speed reducer.

The housing cylinder 200 includes a case (outer cylinder portion) 210, a carrier portion (carrier) 220, and two main bearings 230. The carrier portion 220 is arranged in the case (outer cylinder portion) 210. The two main bearings 230 are arranged between the case (outer cylinder portion) 210 and the carrier portion 220. The two main bearings 230 allow relative rotational movement between the case (outer cylinder portion) 210 and the carrier portion 220. The output unit of the speed reducer 100 in the present embodiment is exemplified by one of the case (outer cylinder portion) 210 and the carrier portion 220.

FIG. 5 shows the central axis (spindle) F0 of the speed reducer 100 defined as the rotation central axis of the two main bearings 230. When the case (outer cylinder portion) 210 is fixed, the carrier portion 220 rotates around the spindle F0. When the carrier portion 220 is fixed, the case (outer cylinder portion) 210 rotates around the spindle F0. That is, one of the case (outer cylinder portion) 210 and the carrier portion 220 can rotate relative to the other of the case (outer cylinder portion) 210 and the carrier portion 220 around the spindle F0.
In the present embodiment, the direction along the central axis (spindle) F0 of the speed reducer 100 as the rotation central axis of the two main bearings 230 is referred to as an axial direction.

A flange portion (mounting flange) 215 is provided around the outer periphery of the cylindrical case (outer cylinder portion) 210. A plurality of mounting holes 216 are formed on the peripheral edge of the flange portion 215 at intervals from each other. The flange portion 215 is used, for example, when the speed reducer 100 is attached to the fitting portion as an inlay.

The case (outer cylinder portion) 210 includes an outer cylinder 211 and a plurality of internal tooth pins (internal teeth) 212. The outer cylinder 211 defines a cylindrical internal space in which the carrier portion 220, the gear portion 300, and the crank assembly 400 are housed. Each internal tooth pin 212 is a columnar member extending substantially parallel to the main axis F0. Each internal tooth pin 212 is fitted into a groove formed in the inner wall of the outer cylinder 211. Therefore, each internal tooth pin 212 is appropriately held by the outer cylinder 211.

The plurality of internal tooth pins 212 are arranged around the spindle F0 at substantially constant intervals. The half peripheral surface of each internal tooth pin 212 projects from the inner wall of the outer cylinder 211 toward the spindle F0. Therefore, the plurality of internal tooth pins 212 function as internal teeth that mesh with the gear portion 300.

The carrier portion 220 includes a base portion (first member) 221, an end plate portion (second member) 222, a positioning pin 223, and a support bolt (fixing bolt) 224. The carrier portion 220 has a cylindrical shape as a whole. A through hole 229 that is concentric with the main shaft F0 is formed in the carrier portion 220.

The base portion (first member) 221 includes a substrate portion 225 and three shaft portions 226. Each of the three shaft portions 226 extends from the substrate portion 225 toward the end plate portion (second member) 222. A screw hole 227 and a reamer hole 228 are formed on the tip surface of each of the three shaft portions 226. The positioning pin 223 is inserted into the reamer hole 228. As a result, the end plate portion (second member) 222 is accurately positioned with respect to the base portion (first member) 221.

The strut bolt 224 is fastened to the screw hole 227. As a result, the end plate portion (second member) 222 is appropriately fixed to the base portion (first member) 221.
The fixing of the base portion (first member) 221 and the end plate portion (second member) 222 by the support bolt 224 is set so as to have a predetermined preload. The end plate portion (second member) 222 is referred to as a hold.

The gear portion 300 is arranged between the substrate portion 225 and the end plate portion (second member) 222. The three shaft portions 226 penetrate the gear portion 300 and are connected to the end plate portion (second member) 222.

The gear unit 300 includes two gears 310 and 320. The gear 310 is arranged between the board portion 225 and the gear 320. The gear 320 is arranged between the end plate portion (second member) 222 and the gear 310.

The gear 310 is substantially equal to the gear 320 in shape and size. The gears 310 and 320 orbit around the outer cylinder 211 while meshing with the internal tooth pin 212. Therefore, the centers of the gears 310 and 320 orbit around the main shaft F0.

The orbital phase of the gear 310 deviates from the orbital phase of the gear 320 by approximately 180 °. While the gear 310 meshes with half of the plurality of internal tooth pins 212 of the case (outer cylinder portion) 210, the gear 320 meshes with the other half of the plurality of internal tooth pins 212. Therefore, the gear portion 300 can rotate the case (outer cylinder portion) 210 or the carrier portion 220.

In the present embodiment, the gear unit 300 includes two gears 310 and 320. Alternatively, a number of gears exceeding 2 may be used as the gear portion. Alternatively, one gear may be used as the gear portion.

Each of the three crank assemblies 400 includes a crank shaft 410, four bearings 421, 422, 423, 424, and a transmission gear (external tooth) 430. The transmission gear 430 may be a general spur gear. In the speed reducer 100 of the present embodiment, the transmission gear 430 is not limited to a specific type.

The transmission gear 430 directly or indirectly receives the driving force generated by the driving source (for example, a motor). The speed reducer 100 can appropriately set a transmission path of the driving force from the driving source to the transmission gear 430 according to the usage environment and usage conditions. Therefore, the present embodiment is not limited to a specific drive transmission path from the drive source to the transmission gear 430.

FIG. 5 shows a crank axis (transmission axis) F2. The transmission shaft F2 is substantially parallel to the spindle F0. The crank shaft 410 rotates around the transmission shaft F2.
The crank shaft 410 includes two journals (crank journals) 411,412 and two eccentric portions (eccentric bodies) 413,414. Journals 411 and 412 extend along the transmission axis F2. The central axis of the journals 411,412 coincides with the transmission axis F2. The eccentric portions 413 and 414 are formed between the journals 411 and 412. Each of the eccentric portions 413 and 414 is eccentric from the transmission shaft F2.

The journal 411 is inserted into the bearing 421. The bearing 421 is arranged between the journal 411 and the end plate portion (second member) 222. Therefore, the journal 411 is supported by the end plate portion (second member) 222 and the bearing 421. The journal 412 is inserted into the bearing 422. The bearing 422 is arranged between the journal 412 and the base (first member) 221. Therefore, the journal 412 is supported by the base (first member) 221 and the bearing 422.
In the present embodiment, the bearing 421 is a needle bearing, and a plurality of rollers 431 are arranged around the journal 411. The bearing 422 is a needle bearing, and a plurality of rollers 432 are arranged around the journal 412.

The eccentric portion 413 is inserted into the bearing 423. The bearing 423 is arranged between the eccentric portion 413 and the gear 310. The eccentric portion 414 is inserted into the bearing 424. The bearing 424 is arranged between the eccentric portion 414 and the gear 320.
In the present embodiment, the bearing 423 is a needle bearing, and a plurality of rollers 433 are arranged around the eccentric portion (eccentric body) 413. The bearing 424 is a needle bearing, and a plurality of rollers 434 are arranged around the eccentric portion (eccentric body) 414.

When the driving force is input to the transmission gear 430, the crank shaft 410 rotates around the transmission shaft F2. As a result, the eccentric portions 413 and 414 rotate eccentrically around the transmission shaft F2. The gears 310 and 320 connected to the eccentric portions 413 and 414 via the bearings 423 and 424 swing in the circular space defined by the case (outer cylinder portion) 210. Since the gears 310 and 320 mesh with the internal tooth pin 212, a relative rotational movement is caused between the case (outer cylinder portion) 210 and the carrier portion 220.

In the speed reducer 100 according to the present embodiment, the bearing 421 can be configured corresponding to the bearing 1A in the first embodiment. In this case, the crank axis (transmission axis) F2 corresponds to the central axis F3 in the first embodiment. Further, the roller 431 corresponds to the rolling element (roller) 2 in the first embodiment. Journal 411 corresponds to the inner race Ir in the first embodiment. The end plate portion (second member) 222 corresponds to the outer race Or in the first embodiment.

Similarly, in the speed reducer 100, the bearing 422 can be configured corresponding to the bearing 1A in the first embodiment. In this case, the crank axis (transmission axis) F2 corresponds to the central axis F3 in the first embodiment. Further, the roller 432 corresponds to the rolling element (roller) 2 in the first embodiment. The journal 412 corresponds to the inner race Ir in the first embodiment. The end plate portion (second member) 222 corresponds to the outer race Or in the first embodiment.

Similarly, in the speed reducer 100, the bearing 423 can be configured corresponding to the bearing 1A in the first embodiment. In this case, the roller 433 corresponds to the rolling element (roller) 2 in the first embodiment. The eccentric portion (eccentric body) 413 corresponds to the inner race Ir in the first embodiment. The gear 310 corresponds to the outer race Or in the first embodiment.

Similarly, in the speed reducer 100, the bearing 424 can be configured corresponding to the bearing 1A in the first embodiment. In this case, the roller 434 corresponds to the rolling element (roller) 2 in the first embodiment. The eccentric portion (eccentric body) 414 corresponds to the inner race Ir in the first embodiment. The gear 320 corresponds to the outer race Or in the first embodiment.

Also in the speed reducer 100 according to the present embodiment, the above-mentioned cage 1 is housed in each of the bearings 421 to 424.
Thereby, the same action and effect as those of the above-described embodiment can be obtained.

Further, in the present embodiment, the two main bearings 230 can be configured corresponding to the bearing 1A in the first embodiment.

Hereinafter, a third embodiment of the cage and bearing according to the present invention will be described with reference to the drawings.
FIG. 6 is a cross-sectional view taken along the axial direction showing the cage and the bearing in the present embodiment.
In the present embodiment, the difference from the first and second embodiments described above is in the arrangement of the end face portions, and the corresponding components other than the above may be designated by the same reference numerals and the description thereof may be omitted. be.

In the cage 1 of the present embodiment, the end face portions 1b and 1c are all arranged on the outer side in the radial direction with respect to the central axis F3 of the side peripheral portion 1a.

The side peripheral portion 1a is provided with a flange-shaped end face portion 1b projecting outward in the radial direction with respect to the central axis F3 at the end portion 1a1 in the central axis F3 direction. Further, the side peripheral portion 1a is provided with a flange-shaped end face portion 1c projecting outward in the radial direction with respect to the central axis F3 at the end portion 1a2 in the central axis F3 direction.

As shown in FIG. 6, the end face portions 1b and 1c are formed as an annular plate (annular plate shape) extending in a direction orthogonal to the central axis F3. The end face portion 1b and the end face portion 1c have substantially the same contour shape when viewed in the direction along the central axis F3. Both the end face portions 1b and 1c are formed so as to be orthogonal to the side peripheral portion 1a.
The end face portions 1b and 1c have substantially the same outer diameter dimension all around the central axis F3. The end face portions 1b and 1c have substantially the same inner diameter dimension all around the central axis F3.
The end face portions 1b and 1c have substantially the same radial dimensions all around the central axis F3.
The radial dimension of the end face portions 1b and 1c with respect to the central axis F3 is set to be larger than the radial dimension around the axis F4 of the roller (rolling element) 2. The radial dimension of the end face portions 1b and 1c with respect to the central axis F3 may be smaller than the radial dimension around the axis F4 of the roller (rolling element) 2.

The end face portion 1b has a thickness dimension Tb in the direction along the central axis F3 that is substantially the same on the entire circumference around the central axis F3. The end face portion 1b has a thickness dimension Tb in the direction along the central axis F3 that is substantially the same as the total length along the radial direction of the central axis F3.
The end face portion 1c has a thickness dimension Tc in the direction along the central axis F3 that is substantially the same on the entire circumference around the central axis F3. The end face portion 1c has a thickness dimension Tc in the direction along the central axis F3 that is substantially the same as the total length along the radial direction of the central axis F3.

The thickness dimension Tb of the end face portion 1b and the thickness dimension Tc of the end face portion 1c are both formed equally. Both the thickness dimension Tb of the end face portion 1b and the thickness dimension Tc of the end face portion 1c are set to be equal to the thickness dimension Ta of the side peripheral portion 1a.

As shown in FIG. 6, the end face portion 1b is formed with a convex portion (protrusion) 1d serving as a restricting portion or a reinforcing portion at a position facing the end face portion 1c at the radial outer end portion with respect to the central axis F3. NS. The end face portion 1c has a convex portion (protrusion) that serves as a regulating portion or a reinforcing portion at a position facing the end face portion 1b at the radial outer end portion with respect to the central axis F3, corresponding to the convex portion (protrusion) 1d. ) 1e is formed. The convex portions (protrusions) 1d and 1e are formed on the surfaces of the end face portions 1b and the end face portions 1c facing each other.

The convex portions (protrusions) 1d and 1e that serve as the restricting portion or the reinforcing portion are formed continuously in an annular shape around the entire circumference of the central axis F3, respectively. The convex portions (protrusions) 1d and 1e are formed on the outer edge as a restricting portion or a reinforcing portion as thick portions thicker than the thickness in the direction along the central axis F3 in the end face portions 1b and 1c, respectively.
The convex portion (protrusion) 1d serving as the regulating portion or the reinforcing portion is integrally formed with the end face portion 1b. The convex portion (protrusion) 1e serving as the regulating portion or the reinforcing portion is integrally formed with the end face portion 1c.

The convex portion (protrusion) 1d serving as the restricting portion or the reinforcing portion has a width dimension Td along the radial direction of the central axis F3 that is substantially the same on the entire circumference around the central axis F3. The convex portion (protrusion) 1e that serves as the restricting portion or the reinforcing portion has a width dimension Te along the radial direction of the central axis F3 that is substantially the same around the entire circumference of the central axis F3.

The width dimension Td of the convex portion (protrusion) 1d serving as the restricting portion or the reinforcing portion and the width dimension Te of the convex portion (protrusion) 1e are both formed equally.
The width dimension Td of the convex portion (protrusion) 1d serving as the restricting portion or the reinforcing portion and the width dimension Te of the convex portion (protrusion) 1e are both formed to be equal to the thickness dimension Ta of the side peripheral portion 1a. ..

The convex portion (protrusion) 1d serving as the restricting portion or the reinforcing portion can be visually recognized from the opening space 1p by looking outward from the inside in the radial direction with respect to the central axis F3. That is, the convex portion (protrusion) 1d serving as the restricting portion or the reinforcing portion protrudes in a direction closer to the end face portion 1c than the side 1p1 which is the contour end portion in the direction along the central axis F3 of the opening space 1p. .. That is, the convex portion (protrusion) 1d protrudes toward the center side of the opening space 1p from the end face 1p1 which is the contour of the opening space 1p in the direction along the central axis F3.

The convex portion (protrusion) 1e serving as the restricting portion or the reinforcing portion can be visually recognized from the opening space 1p when viewed outward from the inside in the radial direction with respect to the central axis F3. That is, the convex portion (protrusion) 1e serving as the restricting portion or the reinforcing portion protrudes toward the center side of the opening space 1p from the end face 1p1 of the opening space 1p which is a rectangular contour in the direction along the central axis F3. There is.

The distance Tde between the convex portion (projection) 1d and the convex portion (projection) 1e in the direction along the central axis F3 is a pair of facing each other with the contour of the opening space 1p in the direction along the central axis F3. It is less than the distance Tp between parallel sides. Similarly, in the direction along the central axis F3, the distance Tde between the convex portion (projection) 1d and the convex portion (projection) 1e is the rolling element (roller) 2 in the direction along the central axis F3. It is set to be approximately equal to or slightly larger than the length T2.
The difference between the distance Tde and the distance Tp is set so as to be equal to the total length of one side extending in the circumferential direction with respect to the central axis F3 in the opening space 1p which is a rectangular contour.

The difference between the distance Tde and the length T2 is set to be equal to the total length of the end face 1p1 on one side, which is a rectangular contour of the opening space 1p in the circumferential direction with respect to the central axis F3.
The end faces of the convex portions (protrusions) 1d and the convex portions (protrusions) 1e facing each other are parallel in the direction orthogonal to the central axis F3. The end faces of the convex portions (protrusions) 1d and the convex portions (protrusions) 1e facing each other are subjected to surface treatment such as smoothing, flattening, and deburring. The end faces of the convex portion (protrusion) 1d and the convex portion (protrusion) 1e are smoothed and flattened higher than the end surface 1p1 of the opening space 1p so that friction with the end surface of the roller 2 can be reduced. Is done.

The end faces of the convex portion (protrusion) 1d and the convex portion (protrusion) 1e maintain the same distance Tde in the total length in the radial direction with respect to the central axis F3. That is, the end faces of the convex portion (protrusion) 1d and the convex portion (protrusion) 1e maintain the same distance Tde in the thickness direction thereof.
The end faces of the convex portion (protrusion) 1d and the convex portion (protrusion) 1e maintain the same distance Tde on the entire circumference in the circumferential direction with respect to the central axis F3. That is, the end faces of the convex portion (protrusion) 1d and the convex portion (protrusion) 1e maintain the same distance Tde in the circumferential direction with respect to the central axis F3.

The end faces of the convex portion (protrusion) 1d and the convex portion (protrusion) 1e can be positioned so as to be separated from the central axis F3 in the radial direction with respect to the central axis F3. Alternatively, the end faces of the convex portion (protrusion) 1d and the convex portion (protrusion) 1e can be positioned to include the axis F4 in the radial direction with respect to the central axis F3.

The cage 1 in the present embodiment is provided with a plurality of side peripheral portions 1a along the circumferential direction around the central axis F3 and a plurality of lateral peripheral portions 1a in the circumferential direction to serve as storage positions for the rollers (rolling elements) 2. 1p, flange-shaped end face portions 1b, 1c extending radially outward from the end portions 1a1, 1a2 in the direction along the central axis F3 of the side peripheral portion 1a, and the central axis of the end face portions 1b, 1c. It is provided with convex portions (reinforcing portion, restricting portion) 1d, 1e protruding in the direction along the central axis F3 from the outer peripheral end portion in the radial direction with respect to F3 toward the center of the contour of the opening space 1p, and the convex portion (reinforcing portion). The portions and the restricting portions 1d and 1e project from the sides of the rectangular contour of the opening space 1p toward the center of the contour of the opening space 1p in the direction along the central axis F3.

Next, a method of forming the cage in the present embodiment will be described.

The method for forming the cage 1 in the present embodiment is integrally molded from a plate material by press working. At this time, in the formation of the cage 1, the side peripheral portions 1a and the end face portions 1b and 1c are bent so that the radial cross section with respect to the central axis F3 is substantially U-shaped, and the peripheral portions with respect to the central axis F3 are connected. And form an annular shape.
Further, in the end face portions 1b and 1c, the outer peripheral side end portions with respect to the central axis F3 are bent in a direction facing each other and close to each other to form convex portions (reinforcing portion, restricting portion) 1d and 1e.

Further, the end faces of the convex portions (reinforcing portion, regulating portion) 1d and 1e are subjected to surface treatment such as deburring so as not to hinder the rotation of the roller (rolling body) 2 at the time of contact.
In this way, the cage 1 is formed as a C shape whose radial cross section with respect to the central axis F3 is close to a substantially rectangular shape.

The order of bending, the order of surface treatment, and the like may be appropriately set from the viewpoint of ease of processing, and are not limited to the above order.

The state of the cage 1 and the roller (rolling body) 2 in the present embodiment will be described.

Here, consider a case where the roller (rolling element) 2 is tilted so that the axis F4 is tilted and the center axis F3 is tilted in the cage 1.
Here, the cage 1 is used as a bearing. Therefore, as shown in FIG. 1 in the first embodiment, the outer race Or is located outside the cage 1 in the radial direction with respect to the central axis F3. Further, the inner race Ir is similarly located inside the cage 1 in the radial direction with respect to the central axis F3.
Therefore, the state in which the roller (rolling element) 2 is tilted along the circumferential direction with respect to the central axis F3 is considered.

In the cage 1 of the present embodiment, when the roller (rolling body) 2 is tilted so that the axis F4 is tilted and tilted with respect to the central axis F3, first, a convex portion is formed on the end surface of the roller (rolling body) 2. (Reinforcing part, regulating part) 1d and 1e come into contact with each other. In this state, the roller (rolling element) 2 does not come into contact with the side end surface 1p1 of the rectangular contour of the opening space 1p. Therefore, no stress is generated in the side peripheral portion 1a near the contour of the opening space 1p due to the contact of the rollers (rolling elements) 2. In particular, the roller (rolling element) 2 does not come into contact with the vicinity of the corner of the rectangular contour in the opening space 1p, and stress concentration does not occur.

Further, when the roller (rolling body) 2 is tilted in this way and the roller (rolling body) 2 first comes into contact with the convex portions (reinforcing portion, regulating portion) 1d, 1e, the convex portion (reinforcing portion, regulating portion) is further contacted. Part) The end face parts 1b and 1c are deformed so that 1d and 1e are separated from each other in the central axis F3 direction. That is, the end face portion 1b and the end face portion 1c are deformed so as to be separated from each other. At this time, the outer peripheral side of the end face portion 1b and the end face portion 1c on which the convex portion (reinforcing portion, regulating portion) 1d and the convex portion (reinforcing portion, regulating portion) 1e are formed is along the central axis F3. It deforms so as to be separated in the direction. On the other hand, the end face portion 1b and the end face portion 1c are suppressed from being deformed on the inner peripheral side connected to the side peripheral portion 1a.

As a result, it is possible to suppress the occurrence of stress concentration in the side peripheral portion 1a. Further, when the filling rate of the rollers is increased, it is possible to prevent the occurrence of damage even in the side peripheral portion 1a which is thinned and the strength is lowered. Further, the life of the cage 1 can be extended.

Further, consider a case where the roller (rolling element) 2 moves along the central axis F3 along the central axis F3, although the axis F4 does not incline due to the action of the skew force in the cage 1.

As described above, in the cage 1 of the present embodiment, when the roller (rolling body) 2 moves along the central axis F3 without tilting the axis F4, the roller (rolling body) 2 is first moved to the end surface of the roller (rolling body) 2. The convex portions (reinforcing portion, regulating portion) 1d and 1e come into contact with each other. In this state, the roller (rolling element) 2 does not come into contact with the end face 1p1 of the rectangular contour side of the opening space 1p. Therefore, no stress is generated in the side peripheral portion 1a near the contour of the opening space 1p due to the contact of the rollers (rolling elements) 2.

Further, when the roller (rolling body) 2 moves in this way and the roller (rolling body) 2 first comes into contact with the convex portion (reinforcing portion, regulating portion) 1d or the convex portion (reinforcing portion, regulating portion) 1e. The end face portion 1b or the end face portion 1c is deformed so that the convex portions (reinforcing portion, regulating portion) 1d and 1e are separated from each other in the central axis F3 direction. That is, the end face portion 1b and the end face portion 1c are deformed so as to be separated from each other. At this time, the outer peripheral side of the end face portion 1b and the end face portion 1c on which the convex portion (reinforcing portion, regulating portion) 1d and the convex portion (reinforcing portion, regulating portion) 1e are formed is along the central axis F3. It deforms so as to be separated in the direction. On the other hand, the end face portion 1b and the end face portion 1c are suppressed from being deformed on the inner peripheral side connected to the side peripheral portion 1a.

As a result, the cage 1 of the present embodiment can suppress the occurrence of stress concentration in the side peripheral portion 1a, prevent the occurrence of breakage, and extend the life. Therefore, the radius of the curve formed at the corner of the rectangular contour of the opening space 1p can be reduced, the gap between the cage 1 and the rolling element 2 can be reduced, and the size can be reduced.

Further, the cage 1 of the present embodiment can be manufactured at low cost by reducing the number of forming steps, reducing the number of formed parts, and having a simple structure that can be integrally molded by bending four threads. It is possible to do.

In the present embodiment, the same action and effect as those in the above-described embodiment can be obtained.

Examples of utilization of the present invention include a speed reducer and a drive device (power transmission device) that are used by connecting needle bearings.

1 ... Cage 1A ... Bearing 1a ... Side peripheral portion 1a1, 1a2 ... End portion 1b, 1c ... End face portion 1d, 1e ... Convex portion (reinforcing portion, regulating portion)
1p ... Opening space 1p1 ... End face F3 ... Central axis F4 ... Axis 2 ... Roller (rolling element)

Claims (15)

A bearing cage that holds multiple rolling elements around the central axis.
A side peripheral portion in which a plurality of the rolling elements are housed along the circumference of the central axis, and
An annular plate-shaped end face portion arranged in the radial direction of the central axis at the end portion of the side peripheral portion,
Reinforcing part arranged on the end face part and
With,
Cage. In the cage according to claim 1,
The reinforcing portion is formed in an annular shape.
Cage. In the cage according to claim 1,
The reinforcing portion is formed integrally with the end face portion and is a thick portion thicker than the thickness of the end face portion in the direction along the central axis.
Cage. In the cage according to claim 3,
The reinforcing portion and the end portion of the rolling element can come into contact with each other in a direction along the central axis.
Cage. In the cage according to claim 1,
The side peripheral portion includes the end face portions at both ends in a direction along the central axis.
Cage. In the cage according to claim 5,
The reinforcing portion is formed on the facing surface of the end face portion.
Cage. In the cage according to claim 6,
A cage in which the end face portion and the reinforcing portion are integrally molded by press working. A bearing cage that holds multiple rolling elements around the central axis.
A side peripheral portion having a rectangular opening space in which a plurality of the rolling elements are housed along the circumference of the central axis.
An annular plate-shaped end face portion arranged from the end portion of the side peripheral portion in the direction along the central axis toward the radial direction of the central axis, and
A restricting portion that protrudes from the end face forming the contour of the opening space closer to the rolling element in the lateral peripheral portion.
Have,
Cage. In the cage according to claim 8,
The regulation part is formed integrally with the end face part,
The restricting portion is integrally formed with the end face portion, and is arranged at a position close to the rolling element along the central axis direction from the inner circumference of the end face portion.
Cage. In the cage according to claim 8,
A cage in which the end face portion and the regulation portion are integrally molded by press working. In the cage according to claim 8,
The end portion of the contour of the opening space seen in the radial direction of the central axis in the direction along the central axis, and the end portion of the rolling element visible from the opening space in the direction along the central axis. But are separated from each other,
Cage. In the cage according to claim 8,
The side peripheral portion includes the end face portions at both ends in a direction along the central axis.
Cage. In the cage according to claim 12,
The restricting portion is formed on the opposite surface of the end face portion.
Cage. An outer race that is formed in an annular shape and has an abduction surface that faces inward in the radial direction.
An inner race that is arranged coaxially with the outer race and has an inward rolling surface that faces outward in the radial direction.
A plurality of rolling elements that roll on the adduction surface and the abduction surface, and
The cage according to any one of claims 1 to 12, which holds a plurality of the rolling elements.
Have,
bearing. An outer cylinder with internal teeth arranged along the circumferential direction formed on the inner peripheral surface,
An eccentric swing gear having external teeth that mesh with the internal teeth of the outer cylinder, a crank shaft connected to a drive source to swing the eccentric swing gear, and the like.
A carrier that supports the crank shaft and rotates relative to the outer cylinder,
Equipped with
A speed reducer in which the crank shaft is supported by the carrier by the bearing according to claim 14.

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