JP2006038088A - Roller bearing device and planetary power transmission device using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a roller bearing device 10 with a shaft 13 as an inner ring member instead of an outer ring member, easy to handle with structural components combined in a non-separative manner. <P>SOLUTION: A small diameter groove portion 13a in a grooved shape is provided in the outer peripheral face of the shaft 13, and a plurality of rollers 11 are circumscribed and arranged in the small diameter groove portion 13a. The axial movement of the rollers 11 is restricted and the come-off of the plurality of rollers 11 is prevented by a cage 12 having pockets 12a in a plurality of circumferential positions. The roller bearing device 10 comprises the shaft 13, the rollers 11 and the cage 12 as structural components combined in a non-separative manner. The roller bearing device 10 is therefore easy to handle in a carrying process or in a working process when mounted at a site in use. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a roller bearing device and a planetary power transmission device using the roller bearing device.

As roller bearings used by being incorporated in the inner periphery of the gear, what is called a cage and roller is the mainstream. This roller bearing called a cage-and-roller has a configuration in which a plurality of rollers are held by a cage (see, for example, Patent Document 1). In this roller bearing, it is necessary to prevent the cage from being separated from the cage until it is assembled in the place of use. A roller stopper is provided to prevent slipping out. Therefore, usually, the cross-sectional shape along the axial direction of the column portion has to be wavy in the axial direction so as to provide the portion to be the above-mentioned roller stopper. Bearing load capacity is reduced. In addition, since it is necessary to bend the cross-sectional shape of the pillar portion of the cage in a complex manner and to provide a roller stopper, the manufacturing cost is high, such as complicated processing and poor manufacturing efficiency.
JP 2002-276672 A

  An object of the present invention is to solve the problem of easy handling by combining each component in a non-separable manner in a roller bearing device having a shaft that becomes an inner ring member without an outer ring member.

  A roller bearing device according to the present invention has a shaft that does not have an outer ring member but serves as an inner ring member. Each roller is controlled to move in the axial direction, and a plurality of rollers are prevented from coming off by a cage having pockets at a plurality of locations in the circumferential direction.

  According to the present invention, each component of the roller bearing device having a configuration in which the shaft is used as the inner ring member without using the outer ring member is combined in a non-separable manner. Becomes easier.

  Preferably, the cage is a roller in which the circumferentially facing interval between the pillar portions located between the pockets is made smaller than the diameter of the roller, and the cage is disposed on the shaft. Each roller can be prevented from coming off by being positioned on the outer diameter side of the circle connecting the centers of the two.

  In this case, since the circumferential width of each column portion can be made as small as possible and adjacent rollers can be arranged close to each other, a retainer provided with a roller retainer as in the conventional example Compared to the above, the number of rollers used can be increased, which is advantageous in increasing the bearing load capacity.

  A planetary power transmission device according to the present invention includes a plurality of planetary wheels interposed between an outer ring and a sun shaft, and each planetary wheel is inserted with a shaft via a roller bearing. The bearing is composed of a plurality of rollers and a cage for holding each roller, and the roller bearing and the shaft are the roller bearing device described above.

  In this case, since the roller bearing device in which the above-described shaft and the assembly composed of the plurality of rollers and the cage are integrated as a non-separable one is used, the assembly of the shaft and the plurality of rollers and the cage is used. Compared to a planetary power transmission device in which the two are handled as separate parts, the assemblability and workability are improved, which is advantageous in reducing the manufacturing cost.

  The roller bearing device of the present invention is easy to handle when the roller bearing device is transported and to be assembled into a use object. The planetary power transmission device of the present invention using this roller bearing device has good assemblability and workability, and is advantageous in reducing manufacturing costs.

  The best mode for carrying out the present invention will be described below with reference to the drawings. 1 is a perspective view showing the best embodiment of the roller bearing device, FIG. 2 is an exploded perspective view of the roller bearing device of FIG. 1, FIG. 3 is a sectional view of the roller bearing device of FIG. 1, and FIG. FIG. 4 is a cross-sectional view taken along line (4)-(4) in FIG. 3.

  The roller bearing device 10 has a plurality of rollers 11, a cage 12, and a shaft 13, all of which are non-separated.

  The roller 11 is an elongated type called a needle roller, but may be a cylindrical roller. The cage 12 has pockets 12a for accommodating the rollers 11 at a plurality of locations in the circumferential direction. Between each pocket 12a, the pillar part 12b exists. Each column part 12b is strip-shaped along the axial direction.

  The shaft 13 is provided with a small-diameter groove portion 13a having a small diameter in the middle in the axial direction of the outer peripheral surface, and a small-diameter groove portion 13a from the inner end side of the horizontal hole 13b and the horizontal hole 13b extending from one end in the axial direction to the middle in the axial direction. An oil supply path comprising a vertical hole 13c extending toward the vicinity of the center in the axial direction is provided.

  The cage 12 has a diameter PCD of a circle connecting the centers of the rollers 11 arranged on the shaft 13 so that the outer diameter surface is used as an outer diameter guide type guided by an inner peripheral surface of an outer ring member (not shown). It is arranged on the outer diameter side. In addition, the circumferentially facing interval W of each column portion 12b of the retainer 12 is set to be smaller than the diameter R of the rollers 11 so that the rollers 11 cannot escape from the pockets 12a of the retainer 12 radially outward. .

  By the way, by forcibly inserting the roller 11 from the outer diameter side into each pocket 12a of the retainer 12 with the retainer 12 fitted on the small diameter groove 13a of the shaft 13, the shaft 13, the retainer 12, The plurality of rollers 11 are not separated.

  As described above, since the components of the roller bearing device 10 having the configuration in which the shaft 11 is the inner ring without using the outer ring are combined in a non-separable manner, the roller bearing device 10 is handled during transportation and is incorporated into the object of use. Becomes easier. Moreover, since the cage 12 is made larger than the PCD of each roller 11, the circumferential width of each column portion 12b can be made as small as possible so that the adjacent rollers 11 can be arranged close to each other. Become. Therefore, in the case of this embodiment, the number of rollers 11 used can be increased as compared with the cage in which the rollers are provided as in the conventional example, which is advantageous in increasing the bearing load capacity.

  5 and 6, another embodiment of the roller bearing device of the present invention will be described. FIG. 5 is a diagram corresponding to FIG. 3, and FIG. 6 is a diagram corresponding to FIG.

  In the region from the middle in the axial direction of the shaft 13 to the other end in the axial direction, a reduced diameter portion 13d having a small diameter is provided in a stepped manner, and a circumferential groove 13e is provided at a predetermined position of the reduced diameter portion 13d. A retaining ring 14 is attached. That is, in this embodiment, the reduced diameter portion 13d and the retaining ring 14 secure a small diameter groove portion 13a as shown in FIG. 3 to restrict the movement of the roller 11 in the axial direction. In this case, since the outer diameter of the retaining ring 14 is smaller than the inner diameter of the cage 12, the retaining ring 14 restricts movement of the roller 11 to the other end in the axial direction. Of course, the outer diameter of the retaining ring 14 may be larger than the inner diameter of the cage 12. In this case, the degree of freedom increases in the method of assembling the roller bearing device 10, which improves the assemblability and workability, and is advantageous in reducing the manufacturing cost.

  A planetary power transmission device using the roller bearing device 10 will be described with reference to FIGS. FIG. 7 is a front view of the planetary power transmission device according to the present invention, and FIG. 8 is a sectional view taken along line (8)-(8) in FIG.

  The planetary gear type power transmission device shown in the figure has a plurality of planetary wheels 3 interposed between an outer ring 1 and a sun shaft 2, and each planetary ring 3 has a roller bearing device 10 shown in FIGS. 1 to 4. It is the structure supported by the carrier 4 via.

  The outer ring 1 is an internal gear having teeth on the inner peripheral surface. The sun shaft 2 is an external gear having teeth on the outer peripheral surface, and is inserted concentrically on the inner periphery of the outer ring 1. Each planetary wheel 3 is an external gear having teeth on the outer peripheral surface, and is interposed between the outer ring 1 and the sun shaft 2 so as to mesh with each other. The carrier 4 performs a rotation operation synchronized with the revolution operation of the planetary wheel 3, and has a shape in which a large-diameter disk portion 4 b is provided at one end of the shaft portion 4 a, and a predetermined interval in the circumferential direction of the large-diameter disk portion 4 b. Every other shaft hole 4c is provided to penetrate in the plate thickness direction (axial direction). In this roller bearing device 10, one end of the shaft 13 in the axial direction is extended, and this extended portion is fitted and fixed to the shaft hole 4 c of the carrier 4 by, for example, press-fitting. A method for fixing the shaft 13 is not shown, but a pin may be driven toward the shaft 13 from the outer diameter side of the large-diameter disk portion 4b.

  The operation of this planetary power transmission device will be described. When the sun axis 2 is driven, the planetary ring 3 rotates and revolves, and the carrier 4 is rotated along with the revolution of the planetary ring 3, so that the rotation speed of the sun axis 2 is decelerated and transmitted to the carrier 4. It becomes a reducer. On the other hand, when the carrier 4 is driven, each planetary wheel 3 rotates and revolves, and the sun shaft 2 is rotated. Therefore, the speed increaser that is transmitted to the sun shaft 2 with the rotation speed of the carrier 4 increased. Become.

  In this type of planetary power transmission device, the shaft 13 of the roller bearing device 10 and the assembly of the plurality of rollers 11 and the cage 12 are usually handled as separate parts. When the planetary power transmission device is configured using the roller bearing device 10 in which the assembly and the assembly are not separated, the assembly and workability are improved, which is advantageous in reducing the manufacturing cost.

  A planetary power transmission device using the roller bearing device 10 shown in FIGS. 5 and 6 will be described with reference to FIG. FIG. 9 is a diagram corresponding to FIG.

  In this example, one end side in the axial direction of the reduced diameter portion 13 d of the shaft 13 of the roller bearing device 10 is extended, and this extended portion is fitted into the shaft hole 4 c of the carrier 4 by press fitting. A method for fixing the shaft 13 is not shown, but a pin may be driven toward the shaft 13 from the outer diameter side of the large-diameter disk portion 4b. Also in this case, the same operation and effect as the planetary power transmission device shown in FIGS. 7 and 8 can be obtained.

  Hereinafter, other embodiments of the present invention will be described.

  (1) The cross-sectional shape of the column portion 12b of the cage 12 is not particularly limited. For example, a cage having a M-shaped cross-sectional shape or a gate-type retention in which the inner diameter side of the column portion is recessed. It is good also as a container.

  (2) The planetary power transmission device is a gear transmission type, but may be, for example, a friction transmission type. The friction transmission type is a smooth surface without gears on the inner peripheral surface of the outer ring 1, the outer peripheral surface of the sun shaft 2, and the outer peripheral surface of the planetary wheel 3.

  (3) The roller bearing device 10 can be used not only for the planetary power transmission device but also for a roller support portion of a rocker arm with a roller. In this case, both ends of the shaft 13 are fitted and fixed to the rocker arm body.

The perspective view which shows the best embodiment of the roller bearing apparatus which concerns on this invention 1 is an exploded perspective view of the roller bearing device of FIG. Sectional view of the roller bearing device of FIG. Arrow view of section of line (4)-(4) in FIG. FIG. 3 is a view corresponding to FIG. 3 in another embodiment of the roller bearing device according to the present invention. FIG. 5 is a view corresponding to FIG. 2 in the roller bearing device of FIG. Front view of planetary power transmission device according to the present invention 7 is a cross-sectional view taken along line (8)-(8) in FIG. FIG. 8 is a diagram corresponding to FIG. 8 in another embodiment of the planetary power transmission device according to the present invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Roller bearing apparatus, 11 ... Roller, 12 ... Cage, 12a ... Pocket, 13 ... Shaft, 13a ... Small diameter groove part.

Claims (3)

A roller bearing device having a shaft that is an inner ring member without an outer ring member,
A small-diameter groove portion is provided on the outer peripheral surface of the shaft, and a plurality of rollers are inscribed in the small-diameter groove portion to restrict movement of each roller in the axial direction. A roller bearing device characterized in that the roller is retained.   In the cage, the circumferentially facing interval between the pillar portions located between the pockets is made smaller than the diameter of the roller, and the center of each roller having the cage arranged on the shaft is arranged. The roller bearing device according to claim 1, wherein each roller is prevented from coming off by being positioned on the outer diameter side of the connecting circle. A planetary power transmission device in which a plurality of planet wheels are interposed between an outer ring and a sun shaft, and a shaft is inserted into each planet wheel via a roller bearing,
The roller bearing comprises a plurality of rollers and a cage for holding each roller, and the roller bearing and the shaft are the roller bearing device according to claim 1 or 2, and the planetary power Transmission device.

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