JP2002310162A - Roller device with holder and planetary gear drive using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce abrasion, to prolong a service life while using a resin holder in the use state where a relative contact on a width face of the holder due to eccentric motion is severe and to contribute to a cost reduction without an increase in the number of parts or assembling processes. SOLUTION: A plurality of rollers 2 with holders are arranged in parallel so that each of them makes eccentric motion. Each of the rollers 2 with the holders is arranged so that holders 3 of the adjacent rollers 2 with the holders are brought into contact with each other on a width face a. The holder 3 is made of resin and has a pocket 8 in which rollers 4 are contained at a plurality of points in the circumferential direction. In this roller device with holders, a different material layer 9 to be a friction suppressing means or a metal annular plate material is provided on the width face of the holder 3. Materials of the holders 3 in contact can be made different.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roller device with a retainer comprising a plurality of rollers with retainers arranged so as to be eccentric to each other, and a planetary gear device using the same.

[0002]

2. Description of the Related Art As a usage form of a roller with a cage, there is a case where a plurality of rollers are arranged side by side so as to be eccentrically rotated with respect to each other, and a relative contact occurs on a width surface of the cage. . For example, in a planetary gear device of a general-purpose speed reducer, planetary gears are installed on a plurality of eccentric shaft portions adjacent to each other on a crankshaft via rollers with retainers. In recent years, due to demands for cost reduction in bearings in general, there has been a shift from metal cages to resin cages, and even in rollers with cages in the above-mentioned parts, resin cages have been demanded. I have.

[0003] However, when a cage made of resin is used, in the above-described usage form, wear is extremely short due to relative contact between the width surfaces of the cage. It is known that when the same kind of resin material makes relative contact, abnormal wear is promoted,
The contact of the cage is a relative contact of such similar materials. In order to prevent this, there is an example in which a washer or the like is interposed. However, if such parts are inserted, the number of parts increases, the number of assembling steps increases, and the assemblability of the equipment using the rollers with the cage decreases, and the cost increases. Invite. In addition, it may happen that the washer is forgotten to be assembled, which leads to a decrease in assembly reliability.

SUMMARY OF THE INVENTION It is an object of the present invention to reduce the wear and extend the service life of a cage made of resin in a usage mode in which relative contact between the width surfaces of the cage is severe due to eccentric movement, and increase the number of parts and the number of assembly steps. An object of the present invention is to provide a roller device with a cage that can contribute to cost reduction and improvement in assembly reliability without increasing the cost. Another object of the present invention is to reduce the wear of the cage and extend the life thereof by using the rollers with the cage in a plurality of eccentric shaft portions adjacent to the crankshaft, and to increase the number of parts and the number of assembly steps. Rather, to provide a planetary gear device that can contribute to cost reduction and improvement in assembly reliability.

[0005]

According to a first aspect of the present invention, there is provided a roller device with cage according to the present invention, comprising at least two rollers with cage that are arranged side by side so as to eccentrically move with each other.
The above rollers with cages are arranged such that the cages of the adjacent rollers with cages are in contact with each other in the width direction. That is, they are arranged so that contact occurs. The retainer is made of a synthetic resin and has pockets into which rollers are inserted at a plurality of positions in the circumferential direction. In the roller device with a cage having the above configuration,
A friction suppressing means is provided on a width surface of the cage. According to this configuration, the adjacent rollers with the retainer eccentrically move with each other and come into contact with each other on the width surface of the retainer. Therefore, relative contact between the cages is severe. However, since the friction suppressing means is provided on the width surface of the retainer, the retainers come into relative contact via the friction suppressing means. Therefore, wear is reduced and the life can be extended. Since the friction suppressing means is provided on the width surface of the retainer, it is not necessary to take measures to prevent wear using a separate part, and the number of parts and the number of assembling steps are not increased.
Assembly reliability is also improved. Since the resin cage is partially provided with the friction suppressing means, the cost can be reduced as compared with the metal cage.

In the first invention, the friction suppressing means may be a wear-resistant resin coating layer provided on a width surface of the cage. In the case of this configuration, wear is suppressed by the wear resistance of the wear-resistant resin. Unlike the case where the entire cage is made of a wear-resistant resin, the wear-resistant resin is provided as a coating layer on the width surface, so other parts of the cage can be made of inexpensive materials, having strength, self-lubricating properties, etc. Materials can be selected according to the required properties. In addition, because of the coating, the wear-resistant resin layer can be easily formed.

In the first invention, the friction suppressing means may be a plating layer provided on a width surface of the cage. By using a plated layer, a layer of a metal material or the like can be easily formed on the width surface of the cage as a friction suppressing means, and wear can be reduced.

In the first invention, the friction suppressing means may be a metal annular plate fixed to a width surface of the retainer. In this configuration, the width surfaces of the retainers are brought into contact with each other by the metal annular plate material, and wear is reduced as compared with synthetic resin.

In the first invention, the friction suppressing means may be a different material layer having properties other than the physical properties of the synthetic resin of the cage. In this case, the dissimilar material layer is provided only on one of the opposing width surfaces of the adjacent cages that are in contact with each other, or the dissimilar material layer is provided on both width surfaces, and the properties of the different dissimilar material layers are different from each other. Have In the case of such a configuration, the width surfaces on which the adjacent cages make relative contact have different physical characteristics due to the formation of the dissimilar material layer. Therefore, abnormal wear due to relative contact between similar materials is suppressed, and the life is extended.

A roller device with a retainer according to a second aspect of the present invention includes at least two rollers with a retainer which are juxtaposed so as to eccentrically move with each other. The cages of the attached rollers are arranged so as to be in contact with each other in the width plane. The retainer is made of a synthetic resin and has pockets into which rollers are inserted at a plurality of positions in the circumferential direction. In the roller device with a cage having the above configuration, the cages that are in contact with each other on the width surface are formed of synthetic resins of different materials. In the case of this configuration, since the cages that are in contact with each other are formed of synthetic resins of different materials, abnormal wear due to relative contact between the same materials is prevented. Therefore, the service life is long. Since the measures are taken by making the material of the cage different, it is not necessary to take measures to prevent wear using separate parts, and the number of parts and the number of assembling steps are not increased, and the assembling reliability is improved. Since it is made of resin, the cost can be reduced as compared with a metal cage.

[0011] In the second invention, the cage is made of a synthetic resin serving as a main material filled with reinforcing fibers, and the cages that are in contact with each other on a width surface have different filling ratios of the reinforcing fibers. In this case, a synthetic resin of the different material may be used. As described above, even when different materials are used by changing the filling ratio of the reinforcing fibers, an effect of preventing abnormal wear due to relative contact of the same material can be obtained. In order to deal with the filling ratio of reinforcing fiber,
It is easy to manufacture cages of different materials.

[0012] In the second invention, the cage is made of a synthetic resin serving as a main material filled with reinforcing fibers, and the cages that are in contact with each other on a width surface are formed by changing the types of the reinforcing fibers. Alternatively, a synthetic resin of a different material may be used. As described above, even when different types of reinforcing fibers are used to obtain different materials, an effect of preventing abnormal wear due to relative contact between the same types of materials can be obtained. Since the type of reinforcing fiber is used, it is easy to manufacture a cage made of different materials.

[0013] In the first and second aspects of the present invention, the retainer includes an annular portion having a diameter larger than a pitch circle of the roller array, and a flange portion protruding toward the inner diameter side from both axial ends of the annular portion. And the pocket may be formed in the annular portion. In the case of this configuration, the pillar between the pockets of the retainer is provided only on the outer diameter side, so that the shape of the retainer is simpler than in the case where a pillar extending over the inner and outer diameters is provided for the purpose of retaining, Manufacturing becomes easy, and it becomes possible to raise the processing limit as to how narrow the column portion between the pockets can be. As a result, the number of rollers can be increased as much as possible in a fixed space, and the load capacity can be maximized.

In the case where the cage is constituted by the annular portion having a larger diameter than the pitch circle diameter of the roller arrangement and the flange portion, the roller is formed on the pitch circle portion on the inner side surface of the flange portion. An engagement means for engaging the end face of the roller and preventing the roller from falling off may be provided. In the case of this configuration, in a state where the roller is not assembled to the device, the rollers are prevented from falling off on both outer edges on both side edges of the pocket in the annular portion of the retainer, and are engaged with the end faces of the rollers on the inner diameter side. It is stopped by means.

The planetary gear device according to the present invention comprises a sun gear having internal teeth or external teeth, a carrier rotatably provided concentrically with the sun gear, and a plurality of eccentrics rotatably supported by and adjacent to the carrier. A crankshaft having a shaft portion, a plurality of planetary gears installed on the eccentric shaft portions of the crankshaft via rollers with retainers and meshing with the sun gear, and a plurality of planetary gears installed on the eccentric shaft portion. The roller device with a retainer according to the present invention is used in the roller device with a retainer configured by the roller with a retainer described in the above.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS. The roller device with a retainer 1 includes two rollers 2 with a retainer arranged side by side so as to eccentrically move with each other.
The retainers 3 are arranged such that contact occurs with each other on the width surface a. Each of the rollers with retainers 2 includes a plurality of rollers 4 arranged in a circumferential direction and a retainer 3 holding the plurality of rollers 4. Each of the rollers 2 with retainers is arranged on the outer periphery of two adjacent eccentric shaft portions 5a and 5b provided on the crankshaft 5, and supports two movable members 7, respectively. The rollers 4 of the rollers 2 with retainers are in rolling contact with the outer diameter surfaces of the eccentric shaft portions 5a and 5b and the inner diameter surface of the movable member 7. Crankshaft 5
On both sides of the row of the eccentric shaft portions 5a and 5b, there are provided regulating members 15 located on both sides of the row of the rollers 2 with cages. Regulated to the range between. The crankshaft 5 and the movable members 7, 7 are, for example, a planetary gear device described later (FIG. 1).
5, the crankshaft 23 and the planetary gear 2 in FIG.
4,25.

The cage 3 of the roller with cage 2 is made of synthetic resin, and has pockets 8 in which the rollers 4 enter at a plurality of positions in the circumferential direction.
Having. The retainer 3 has an annular portion 3a having a larger diameter than the pitch circular diameter PCD of the roller arrangement, and a flange portion 3b projecting from both ends in the axial direction of the annular portion 3a to the inner diameter side. Is formed. The width of the pocket 8 in the circumferential direction of the cage is set to a size that can prevent the roller 4 from coming out of the cage 3 to the outer diameter side. An engagement means 10 that engages with the end face of the roller 4 to prevent the roller 4 from dropping is provided at the pitch circle diameter portion on the inner surface of the flange 3b. The engaging means 10 engages with the engaged portion 12 formed at the center of the end face of the roller 4 and is composed of a boss-shaped convex portion.
The engaged portion 12 is formed of a concave portion.

A different material layer 9 serving as a friction suppressing means is provided on the width surface a of the cage 3. The different material layer 9
It may be provided on the width faces a on both sides of the retainer 3 or may be provided only on the width face a on the side where relative contact between the retainers 3 occurs. Specific examples of the different material layer 9 will be described later.

According to this configuration, when the crankshaft 5 rotates, the cages 3 of the rollers 2 with cages installed on the eccentric shaft portions 5a and 5b respectively have a movement range of 3A and 3B in FIG. As shown, an eccentric motion, that is, an eccentric rotational motion is performed. At this time, the width surfaces of the two retainers 3 rub against each other with a peripheral speed difference. Therefore, relative contact between the cages is severe. However, since the different material layer 9 serving as the friction suppressing means is provided on the width surface a of the cage 3, the cage 3 comes into relative contact via the different material layer 9. Therefore, wear is reduced and the life can be extended. Since the dissimilar material layer 9 is provided on the width surface of the retainer 3, it is not necessary to take measures to prevent abrasion using another part, and the number of parts and the number of assembly steps are not increased.
Assembly reliability is also improved. In the cage 3 made of resin, since the different material layer 9 is provided in a part, the cost can be reduced as compared with the cage made of metal.

Further, the retainer 3 in this embodiment is
An annular portion 3a having a diameter larger than the pitch circle diameter PCD of the roller arrangement and a flange portion 3b are formed, and the pitch circle diameter portion on the inner side surface of the flange portion 3b is engaged with the end face of the roller 4 to form the roller 4. Since the engaging means 10 for preventing falling off is provided, the following operation can be obtained.
That is, when the roller 4 is not assembled in the device,
Is stopped on both sides of the pocket 8 in the annular portion 3a of the retainer 3 on the outside diameter side, and is stopped on the inside diameter side by the engagement means 10 which engages with the end face of the roller 4. Cage 3
Since the pillars 11 between the pockets 8 are provided only on the outer diameter side, the shape of the retainer 3 is simpler than in the case where pillars extending over the inner and outer diameters are provided for the purpose of retaining, and the manufacturing is easy. As a result, it is possible to raise the processing limit of how narrow the column portion 11 between the pockets 8 can be. As a result, the number of rollers 4 can be increased as much as possible in a fixed space, and the maximum load capacity can be obtained.

A specific example of the dissimilar material layer 9 serving as the friction suppressing means will be described. The “heterogeneous material layer” referred to in this specification is a film-like material layer having properties other than the physical properties of the synthetic resin serving as the base material of the cage 3. Examples of the method for forming the heterogeneous material layer 9 include coating, coating, barreling, plating, and dissolving and removing.

When the different material layer 9 is a wear-resistant resin coating layer, wear is suppressed by the wear resistance of the wear-resistant resin. Unlike the case where the entire cage 3 is made of a wear-resistant resin, the wear-resistant resin is provided as a coating layer on the width surface a.
Inexpensive materials can be selected, and materials can be selected according to required properties such as strength and self-lubricating properties. In addition, because of the coating, the wear-resistant resin layer can be easily formed. The wear-resistant resin used as the coating layer may be a resin whose wear coefficient is reduced as a result of a small friction coefficient, or a resin excellent in wear resistance regardless of the friction coefficient. As the wear-resistant resin used as the coating layer, for example, a fluorine resin can be used.
In the case of a fluororesin, wear is suppressed as a result of a small friction coefficient. Polytetrafluoroethylene (PTFE) or the like can be used as the fluororesin. In addition,
As the wear-resistant resin used as the dissimilar material layer 9, a resin containing carbon fiber (CF) or the like can be used.

When the dissimilar material layer 9 serving as the friction suppressing means is formed of a plated layer of a metal material, the wear resistance of the metal is superior to that of the synthetic resin serving as the base material of the cage 3, so that it is severe. Wear is suppressed against relative contact. As a plating layer of a metal material to be used as the dissimilar material layer 9, for example, a low melting point metal thin film such as lead indium or an electroless nickel coating can be used. Further, the different material layer 9 may have a structure in which a fluororesin coating is provided on the width surface a of the retainer 3 via an electroless nickel coating. When the low melting point metal thin film is used as the dissimilar material layer 9, it may be formed by spraying instead of plating. When the dissimilar material layer 9 is a low melting point metal thin film, the lubricating effect is enhanced, and as a result, an effect of reducing abrasion is obtained. When the fluororesin coating is provided via the electroless nickel coating, the adhesion of the fluororesin coating is improved due to the anchoring effect of the electroless nickel coating, and excellent lubrication is exhibited for a long time.

When the base material of the cage 3 is an engineering plastic material containing glass fibers, the different material layer 9 is a layer obtained by dissolving and removing the glass fibers on the width a of the cage with a hydrofluoric acid solution. There may be. Instead of dissolving and removing, surface treatment may be performed by barrel polishing or shot blasting to remove the glass fibers on the retainer width surface a. By removing the glass fibers on the retainer width surface a, the transfer of the lubricant from the retainer 3 is promoted,
Lubricity is improved. As a result, wear of the retainer width surface a is suppressed. When the cage 3 is made of a mixture of a glass fiber reinforced polyamide resin and an elastomer, the heterogeneous material layer 9 holds the cage 3 in xylene vapor, dissolves the elastomer on the surface, and generates a large number of fine particles. May be a layer in which holes are formed. By forming many small holes,
The lubricant can be held efficiently, and wear is suppressed by improving the lubricity.

The different material layers 9 serving as the friction suppressing means may have different materials on the two surfaces in contact with each other irrespective of whether the material itself has a friction suppressing action. For example, opposing width surfaces a of adjacent cages 3 that are in contact with each other
The dissimilar material layer 9 is provided only on one of the width faces a. Alternatively, different material layers 9 are provided on both width faces a of the opposed width faces a that are in contact with each other, and the different material layers 9 have different physical properties. In the case of such a configuration, the width surface a for performing the relative contact between the adjacent holders 3 is
The formation of the dissimilar material layer 9 results in properties having different physical characteristics from each other. Therefore, abnormal wear due to relative contact between similar materials is suppressed, and the life is extended.

In the above embodiment, the engaging means 10 of the retainer 3 is formed as a convex part.
0, an engaging means 1 comprising a recess as shown in FIG.
0A may be provided. In this case, a boss-shaped convex portion that engages with the engaging means 10A is provided on the end face of the roller 3 as the engaged means 12A. Engaging means 1 comprising a concave portion of retainer 3
0A may be a local one provided for each roller 3 or a groove such as an annular groove extending in the circumferential direction of the retainer 3. Further, the retainer 3 is not limited to the one having the annular portion 3a and the flange portion 3b as shown in each of the above-described embodiments.
As shown in (1), it may have a column portion 11A extending over the inner and outer diameter portions. 4 and 5 are the same as those of the first embodiment described with reference to FIGS. 1 to 3 except for the matters particularly described. In each of the embodiments shown in FIGS. 4 and 5, the different material layers 9 formed on the width surface of the cage 3 and serving as the friction suppressing means can be the same as those described in the first embodiment.

Further, in each of the above-described embodiments, the case where the film-like dissimilar material layer 9 is provided as the friction suppressing means provided on the width surface of the cage 3 has been described.
As illustrated in FIG. 13, a metal annular plate 9A may be provided on the width surface of the retainer 3.

FIGS. 6 and 7 show examples of FIGS.
In the first embodiment, a metal annular plate 9A serving as a friction suppressing means is fixed to the width surface of the retainer 3 in place of the dissimilar material layer 9. Annular plate material 9A
Are fixed to the cage 3 by insert molding. In the example of FIG. 6A, the annular plate 9 </ b> A has a flat shape,
The retainer 3 is provided from the radially intermediate portion to the outer diameter edge. In the example of FIG. 6B, a cylindrical bent piece 9Aa bent inward is provided on the outer diameter edge of the annular plate material 9A. The example of FIG. 7 is different from the example of FIG. 6A in that a plurality of notches 9Ab are provided on the inner diameter of the annular plate 9A to increase the fixing strength between the annular plate 9A and the resin of the retainer 3. It is. The annular plate 9A in each of the above examples is made of, for example, a steel plate. The annular steel plate 9A made of steel plate may be subjected to a heat treatment such as quenching. As in each of these embodiments, when the metal annular plate 9A is fixed to the width surface of the cage 3 as the friction suppressing means, the width surfaces of the cage 3 contact each other with the metal annular plate 9A. Therefore, abrasion is reduced as compared with synthetic resin.

In each of FIGS. 6A, 6B and 7, the engaging means 10 of the retainer 3 is formed as a concave portion. However, in each of FIGS. 6A, 6B and FIG. In FIG.
As shown in FIGS. 9A and 9B and FIG. 9, similarly to the example of FIG. 4, the retainer 3 may be provided with an engaging means 10A formed of a concave portion.

Each of the examples shown in FIGS. 10 to 13 is different from the embodiment shown in FIG. 5 in which the retainer 3 having the column portion 11A extending over the inner and outer diameters is provided, instead of the dissimilar material layer 9. The metal annular plate material 9A serving as a friction suppressing means is fixed to the width surface of (1).

In each of FIGS. 10 and 11, the annular plate 9
A is fixed to the retainer 3 by insert molding.
The annular plate 9A has a flat plate shape and is embedded in an intermediate portion of the retainer 3 excluding the inner and outer diameter edges. Also,
A detent hole 13 is provided at one or more positions in the circumferential direction of the annular plate 9A. At the time of insert molding, the resin material of the cage 3 enters the detent hole 13 and the detent hole 1
By forming the boss portion that engages with 3, the detent effect of the annular plate 9A on the retainer 3 is obtained. In FIGS. 10B and 11B, the annular plate 9A is hatched. In the example of FIG. 10, the fixing effect of the annular plate material 9A is enhanced by forming the inner and outer diameter edges of the annular plate material 9A as tapered surfaces that expand in the depth direction in the embedding direction. In the example of FIG. 11, the fixing effect of the annular plate member 9A is enhanced by forming the inner and outer diameter edges of the annular plate member 9A as stepped surfaces that extend in the depth direction in the embedding direction. Further, in the example shown in the figure, the annular plate 9A protrudes from the width surface of the resin portion of the retainer 3. The detent holes 13 in the examples of FIGS. 10 and 11 may be provided in the examples of FIGS.

In the examples of FIGS. 12 and 13, the annular plate 9
A is assumed to be attached after the cage 3 is formed. In the example of FIG. 12, a cylindrical portion 9Ac is formed on an inner peripheral edge of an annular plate material 9A.
The annular plate 9A is attached to the retainer 3 such that the cylindrical portion 9Ac fits into an annular recess formed on the inner surface of the retainer 3 having an L-shaped cross section. In the example of FIG. 13, the annular plate 9 </ b> A has an L-shaped cross section having a cylindrical portion 9 </ b> Ad on the outer diameter edge, and the cylindrical portion 9 </ b> Ad fits into an annular recess formed on the outer diameter surface of the retainer 3. Then, the annular plate 9A is attached to the retainer 3.

FIG. 14 shows still another embodiment of the present invention. This embodiment is configured as follows instead of providing the cage 3 of each cage roller 2 with the friction suppressing means in the embodiment shown in FIGS. 1 to 3. That is, the cages 3 and 3 of the adjacent caged rollers 2 that are in contact with each other at the width surface a are formed of synthetic resins of different materials. The synthetic resins of different materials may be different from each other in the type of the synthetic resin as the main material, or may be different in the type or the mixing ratio of the auxiliary material added to the synthetic resin as the main material. The auxiliary material may be a reinforcing material such as a reinforcing fiber or a filler.
When the cage 3 is made of a synthetic resin as a main material filled with reinforcing fibers, the two cages 3 may be made of synthetic resins of different materials by making the filling ratios of the reinforcing fibers different from each other. Further, the retainers 3 may be made of synthetic resins of different materials by making the types of the reinforcing fibers different.

For example, when the cage 3 is made of polyamide resin filled with reinforcing fibers, the two cages 3 may be made of synthetic resin of different materials by making the filling ratio of the reinforcing fibers different from each other. . In this case, the reinforcing fibers may be glass fibers, and the filling ratio of one cage 3 may be about 30%, and the filling ratio of the other cage 3 may be about 10%. Further, when the cage 3 is made of polyamide resin filled with reinforcing fibers, the two cages 3 may be made of synthetic resins of different materials by changing the type of the reinforcing fibers. In this case, the reinforcing fiber of one cage 3 is made of glass fiber, and the reinforcing fiber of the other cage 3 is very good carbon fiber.

As described above, when the cages 3 that are in contact with each other are formed of synthetic resins of different materials, abnormal wear due to relative contact between the same materials is prevented. Therefore, the service life is long.
Since it is possible to cope with the problem by changing the material of the retainer 3, it is not necessary to take measures to prevent abrasion using a separate part, so that the number of parts and the number of assembling steps are not increased, and the assembling reliability is improved. Since it is made of resin, the cost can be reduced as compared with a metal cage. When the cage 3 is made of a synthetic resin that is a main material and filled with reinforcing fibers, when the filling ratio of the reinforcing fibers is made different from each other, or when the kinds of the reinforcing fibers are made different materials. Also, an effect of preventing abnormal wear due to relative contact of the same material can be obtained. Since the type of reinforcing fiber is used, it is easy to manufacture a cage made of different materials.

FIGS. 15 and 16 show an example of a planetary gear device to which the roller device with a cage according to the present invention is applied. The planetary gear device includes a sun gear 21 having internal teeth, a carrier 22 serving as a rotation output portion, a crankshaft 23 rotatably supported by the carrier 22 and having a plurality of eccentric shaft portions 23a and 23b adjacent to each other. Each eccentric shaft portion 2 of the crankshaft 23
It has a plurality of planetary gears 24 and 25 rotatably mounted on the sun gears 3 a and 23 b and meshes with the sun gear 21, and a rotation input unit 26 for inputting rotation to the crankshaft 23. Sun gear 2
1 is fixed to the housing 27, and the carrier 22 is rotatable concentrically with the sun gear 21 so as to be rotatable.
And is installed in the housing 27 via the. The rotation input unit 26 includes an input shaft 29 concentric with the sun gear 21 and a transmission gear 30 provided on each crankshaft 23 and meshing with a gear portion of the input shaft 29. The crankshafts 23 are provided at a plurality of positions (for example, three positions) in the circumferential direction of the carrier 22. The planetary gears 24 and 25 are, as shown in FIG.
Each is installed on the eccentric shaft portions 23a and 23b of the crankshaft 23 via the rollers 2 with the retainers. The roller device with a cage according to any one of the embodiments of the present invention is used for the roller device with a cage 1 including the plurality of rollers 2 with a cage.

The operation of the planetary gear device will be described. When the input shaft 29 at the center is rotated, 3
The two crankshafts 23 rotate in synchronization with each other. Here, the first-stage deceleration is performed. The crankshaft 23 and the planetary gears 24 and 25 are connected via a roller 31 with a retainer.
4 and 25 synchronize with the combined motion of the revolution and the rotation when the inner gear rotates inside the sun gear 21 having the internal teeth. The two planetary gears 24 and 25 arranged in the axial direction revolve around the inner periphery of the internal sun gear 21 with a phase shift of 180 ° from each other. Therefore, the inertial force due to the whirling of the two planetary gears 24 and 25 cancels each other. The internal gear sun gear 21 is fixed, and the planet gear 2
Reference numerals 4 and 25 rotate around the inner periphery of the internal gear sun gear 21. The three crankshafts 23 are sandwiched between two disk portions 22a and 22b of the carrier 22 serving as an output member. Therefore,
The revolution of the planetary gears 24 and 25 reaches the carrier 22 through the revolution of the crankshaft 23, and a reduced rotational motion is obtained.

According to the planetary gear device of this configuration, the adjacent rollers with cages 2 installed on the respective eccentric shaft portions 23a and 23b of the crankshaft 23 eccentrically move and come into contact with each other on the width surface of the cage 3. Therefore, relative contact between the cages 3 is severe. However, a friction suppressing means is provided on the width surface of the cage 3,
Alternatively, since the two cages 3 are made of different materials, wear is suppressed and the life is extended. This planetary gear set also
A large load acts on the caged roller 2 interposed between the planetary gears 24 and 25 and the crankshaft 23, and the installation space of the caged roller 2 is limited to avoid an increase in the size of the entire device. Space. In addition, the cage of the roller 2 with the cage is provided with adjacent planetary gears 24 and 25.
In sliding contact with the width of However, as roller 2 with cage,
When the retainer 3 of the above embodiment having the annular portion 3a and the flange 3a having a diameter larger than the pitch circle diameter is used, a large load capacity can be obtained in a limited space. Further, since the flange portion 3b is provided, even when the planet gears 24 and 25 are in sliding contact with the width surfaces of the adjacent eccentric planetary gears 24 and 25, the problem of interference with the inner diameter surfaces of the planetary gears 24 and 25 does not occur.

[0039]

According to the first aspect of the present invention, since the roller device with the cage according to the first invention is provided with the friction suppressing means on the width surface of the cage, the relative contact of the width surface of the cage due to the eccentric movement is severe. In addition, the use of a resin cage makes it possible to reduce the wear and extend the service life, and to contribute to cost reduction and improvement in assembly reliability without increasing the number of parts and the number of assembly steps. In the roller device with a cage according to the second aspect of the present invention, since the cages that are in contact with each other on the width surface are formed of synthetic resins made of different materials, the relative contact between the cage width surfaces due to the eccentric motion is severe. With the use of the retainer described above, wear can be reduced and a long life can be achieved, and there is no increase in the number of parts and the number of assembly steps, which can contribute to cost reduction and improvement in assembly reliability. Since the planetary gear device of the present invention uses the roller device with a retainer of the present invention in the roller device with the retainer configured of a plurality of rollers with the retainer installed on the eccentric shaft portion, the holding in the roller with the retainer is performed. The wear of the container is small, the service life is long, and the number of parts and the number of assembling steps are not increased, thereby contributing to cost reduction and improvement of assembly reliability.

[Brief description of the drawings]

FIG. 1A is a cross-sectional view showing a state in which a roller device with a retainer according to an embodiment of the present invention is installed on a crankshaft;
(B) is a partial enlarged sectional view of the roller with the retainer.

FIG. 2 is a partial perspective view of the retainer.

FIG. 3 is an explanatory diagram showing a moving range of cages in contact with each other in the roller device with cages.

FIG. 4 is a partial cross-sectional view of a roller with a cage in a roller device with a cage according to another embodiment of the present invention.

FIG. 5 is a partial cross-sectional view of a roller with a retainer according to still another embodiment.

FIGS. 6A and 6B are partial cross-sectional views of rollers with retainers according to still another embodiment.

FIGS. 7A and 7B are a partial cross-sectional view of a roller with a cage and a partial side view of the cage in still another embodiment, respectively.

FIGS. 8A and 8B are partial cross-sectional views of rollers with retainers according to still another embodiment.

FIGS. 9A and 9B are a partial cross-sectional view of a roller with a cage and a partial side view of the cage in still another embodiment, respectively.

FIGS. 10A and 10B are a partial sectional view and a partial side view of a roller with a retainer according to still another embodiment, respectively.

FIGS. 11A and 11B are a partial sectional view and a partial side view of a roller with a retainer according to still another embodiment, respectively.

FIGS. 12A and 12B are a partial cross-sectional view and a reduced exploded perspective view of a roller with a retainer according to still another embodiment.

FIG. 13 is a partial sectional view of a roller with a retainer according to still another embodiment.

FIG. 14 is a partial cross-sectional view of a roller device with a cage according to still another embodiment.

FIG. 15 is a schematic diagram of a planetary gear device using the roller device with a cage according to the present invention.

FIG. 16 is a partially cutaway side view of the planetary gear reduction device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Roller device with a cage 2 ... Roller with a cage 3 ... Cage 3a ... Annular part 3b ... Flange part 4 ... Roller 5 ... Crankshaft 5a, 5b ... Eccentric shaft part 8 ... Pocket 9 ... Different material layer (friction suppression) Means 9A ... annular plate material (friction suppressing means) 10, 10A ... engaging means 21 ... sun gear 22 ... carrier 23 ... crankshaft 23a, 23b ... eccentric shaft part 24, 25 ... planetary gear 26 ... input part PCD ... pitch Diameter

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F16H 57/08 F16H 57/08 (72) Inventor Shuichi Kajikawa 1578 Higashikaizuka, Iwata-shi, Shizuoka Pref. F term (for reference) 3J027 FA19 GA01 GB03 GC03 GD04 GD08 GD12 GE25 3J063 AB15 AC01 BA10 BB14 CD02 XA34 XC05 3J101 AA13 AA24 AA32 AA42 AA52 AA62 AA72 BA05 BA34 BA50 DA05 EA31 EA78 FA31 FA32 FA44 FA46 FA46 FA46 FA46 FA46 FA46

Claims (11)

[Claims] At least two rollers with retainers are juxtaposed to be eccentric to each other, and each of the rollers with retainers is arranged such that the retainers of adjacent rollers with retainers come into contact with each other in a width plane. The cage is made of synthetic resin, and in a roller device with a cage having pockets into which rollers are inserted at a plurality of circumferential positions, a friction suppressing means is provided on a width surface of the cage. Roller device with cage featured. 2. The roller device with a cage according to claim 1, wherein the friction suppressing means is a coating layer of a wear-resistant resin provided on a width surface of the cage. 3. The roller device with a cage according to claim 1, wherein the friction suppressing means is a plating layer provided on a width surface of the cage. 4. The roller device with a retainer according to claim 1, wherein the friction suppressing means is a metal annular plate fixed to a width surface of the retainer. 5. The friction suppressing means is a layer of a different material having properties other than the physical properties of the synthetic resin of the cage, and the friction suppressing means is provided only on one of the opposed width surfaces of the adjacent cages that are in contact with each other. The roller with a cage according to claim 1, wherein a dissimilar material layer is provided, or the dissimilar material layers are provided on both width faces, and the dissimilar material layers have properties different from each other. 6. At least two rollers with retainers arranged side by side so as to eccentrically move with each other, wherein each of the rollers with retainers are arranged such that the retainers of the adjacent rollers with retainers are in contact with each other in a width plane. The cage is made of a synthetic resin, and in a roller device with a cage having pockets into which rollers are inserted at a plurality of positions in a circumferential direction, the cages that are in contact with each other in the width direction are made of synthetic resin of different materials. A roller device with a retainer, characterized by being formed by: 7. The retainer is made of a synthetic resin as a main material filled with reinforcing fibers, and the retainers that are in contact with each other on their width surfaces have different filling ratios of the reinforcing fibers, so that the different materials are used. The roller device with a retainer according to claim 6, wherein the roller device is a synthetic resin. 8. The retainer is made of a synthetic resin as a main material filled with reinforcing fibers, and the retainers that are in contact with each other on the width surface are made of different types of synthetic resin by using different types of reinforcing fibers. The roller device with a retainer according to claim 6, wherein 9. The retainer has an annular portion having a diameter larger than the pitch circle diameter of the roller array, and a flange projecting from both ends in the axial direction of the annular portion to the inner diameter side. The roller device with a retainer according to any one of claims 1 to 8, wherein the roller device is formed in a portion. 10. A pitch circle diameter portion on an inner surface of the flange portion,
The roller device with a retainer according to claim 9, further comprising an engagement means for engaging with an end face of the roller to prevent the roller from falling off. 11. A crankshaft having an internal gear or external gear sun gear, a carrier rotatably provided concentrically with the sun gear, and a plurality of eccentric shaft portions rotatably supported by and adjacent to the carrier. And a plurality of planetary gears that are installed on the eccentric shafts of the crankshaft via rollers with cages and mesh with the sun gear, and are provided with a plurality of rollers with cages installed on the eccentric shafts. A planetary gear device comprising a roller device with a retainer configured, comprising the roller device with a retainer according to any one of claims 1 to 10.