JP2018031420A - Roller falling prevention tool and roller bearing with sleeve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily assemble a roller bearing into an eccentric shaft, and surely prevent a roller from falling.SOLUTION: A roller falling prevention tool 21 includes a plurality of rollers 2, and a sleeve 22 configured to support an inner peripheral side of the roller 2 to a needle-like roller bearing 1 comprising a holder 3 for holding the rollers 2 in a circumferential direction, and is configured such that the needle-like roller bearing 1 is assembled into a shaft with the roller 2 supported by the sleeve 22. On an outer peripheral surface of the sleeve 22, a plurality of recess grooves 24 extending in an axial direction is formed in a circumferential direction. The recess grooves 24 housing the rollers 2 are composed of a recess curve with a curvature radius equivalent to that of the outer peripheral surface of the rollers 2.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a roller drop prevention tool and a roller bearing with a sleeve for preventing a roller from dropping out of a roller bearing composed of a plurality of rollers and a cage.

  For example, roller bearings used in automobiles, various industrial machines, and the like include roller bearings that do not include an inner ring and an outer ring in order to make a shaft or gear inner diameter a direct rolling surface. There is a roller bearing of a specification in which a roller is dropped on the inner diameter side instead of arranging a larger number of rollers by arranging the cage pillar only on the outer diameter side.

  As shown in FIGS. 8 and 9, this type of roller bearing 1 includes a plurality of rollers 2 and a cylindrical cage 3 that holds the rollers 2 in the circumferential direction. The cage 3 is formed with a plurality of pockets 4 along the circumferential direction thereof, and has a pair of flange portions 5 extending radially inward from both axial end portions. The roller 2 is held in the pocket 4 of the cage 3 so as to be able to roll.

  In the roller bearing 1 configured as described above, the circumferential width of the pocket 4 of the cage 3 is smaller than the diameter dimension of the roller 2 as shown in FIG. From this, the roller 2 does not come out to the outer peripheral side of the cage 3.

  On the other hand, as shown in FIG. 9, the inner width dimension between both flange portions 5 of the cage 3 is slightly longer than the axial length of the roller 2 in order to allow the roller 2 to roll. Further, since the cage structure does not have a column portion on the inner diameter side in order to increase the number of rollers, the roller 2 falls off to the inner peripheral side of the cage 3 during handling until the roller bearing 1 is assembled to the shaft. become.

  Therefore, until just before the roller bearing 1 is assembled to the shaft, the roller 2 is dropped to the inner peripheral side of the cage 3 by attaching the roller drop-off prevention tool 11 to the roller bearing 1 as shown in FIGS. It is necessary to prevent that. 10 shows a state in which the roller drop-off prevention tool 11 is mounted on the roller bearing 1, FIG. 11 shows the roller drop-off prevention tool 11, and FIG. 12 shows a cross section along the line RR in FIG.

  As shown in FIGS. 10 to 12, the conventional roller drop-off prevention tool 11 includes a sleeve 12 that is fitted to the inner peripheral side of the roller 2 in the roller bearing 1 with a predetermined tightening margin (for example, Patent Document 1). FIG. 4). The sleeve 12 contacts the roller 2 on the inner peripheral side of the cage 3 and supports the roller 2. The sleeve 12 has a flange portion 13 that extends radially outward from the axial end portion thereof.

  Until immediately before the roller bearing 1 is assembled to the shaft 17, as shown in FIG. 13, the roller 2 is supported by the sleeve 12 by fitting the sleeve 12 on the inner peripheral side of the roller 2 in the roller fall-off prevention tool 11. The position of the retainer 3 is regulated by bringing the flange portion 5 of the retainer 3 into contact with the flange portion 13. Thus, by supporting the inner peripheral side of the roller 2 with the sleeve 12, the roller 2 is prevented from falling off to the inner peripheral side of the cage 3.

  When the roller bearing 1 is assembled to the shaft 17, as shown in FIG. 14, in the roller drop-off prevention tool 11, the end portion 15 of the shaft 17 is brought into contact with the axial end portion 16 of the sleeve 12, and the shaft 17 is moved. Move in the direction of the white arrow in the figure. As a result, the sleeve 12 is pushed out by the shaft 17 so that the sleeve 12 comes out of the roller bearing 1. In this way, the roller bearing 1 is incorporated into the shaft 17 as shown in FIG.

Japanese Utility Model Publication No. 4-56721

  By the way, in the conventional roller drop-off prevention device 11, the outer periphery of the sleeve 12 is a cylindrical surface 14 having a uniform thickness over the entire periphery (see FIGS. 11 and 12). When the roller bearing 1 is assembled to the shaft 17, if the shaft 17 is single, the roller bearing 1 can be easily assembled to the shaft 17 as described above by using the conventional roller drop-off prevention tool 11. (See FIGS. 13 to 15).

  However, when the roller bearing 1 is assembled to the eccentric shaft, as shown in FIG. 16, the shaft 17 is inserted into the sleeve 12 and the eccentric shaft 18 (eccentric amount X) connected to the shaft 17 is inserted. When the roller bearing 1 is assembled, it is difficult to assemble the roller bearing 1 to the eccentric shaft 18 with the conventional roller drop-off prevention tool 11.

  That is, in the roller drop-off prevention device 11, as shown in FIG. 16, when the sleeve 12 is thick and its inner diameter is small, the axial end 16 of the sleeve 12 abuts the end 15 of the shaft 17. The shaft 17 cannot be inserted into the sleeve 12, and the roller bearing 1 cannot be assembled to the eccentric shaft 18 connected to the shaft 17.

  In order to enable the roller bearing 1 to be assembled to the eccentric shaft 18 with the conventional roller drop-off prevention tool 11, the inner diameter of the sleeve 12 needs to be increased. Here, when the inner diameter of the sleeve 12 is increased, the thickness of the sleeve 12 is reduced, and the fitting force of the sleeve 12 to the roller bearing 1 is reduced.

  When the fitting force of the sleeve 12 with respect to the roller bearing 1 is reduced, the sleeve 12 may fall out of the roller bearing 1 during conveyance and handling until the roller bearing 1 is assembled to the eccentric shaft 18. When such a sleeve 12 falls off, the roller 2 falls off to the inner peripheral side of the cage 3.

  Therefore, the present invention has been proposed in view of the above-mentioned problems, and the object of the present invention is to facilitate roller assembly of the roller bearing to the eccentric shaft and to reliably prevent the roller from falling off. It is providing a roller bearing with a prevention tool and a sleeve.

  A roller fall-off prevention device according to the present invention includes a sleeve that supports at least one of an inner peripheral side and an outer peripheral side of a roller with respect to a roller bearing including a plurality of rollers and a cage that holds the rollers in a circumferential direction. And a structure in which the roller bearing is assembled to the shaft while the roller is supported by the sleeve.

  As a technical means for achieving the above-mentioned object, the roller drop-off prevention device of the present invention is formed with a groove extending in the axial direction at a plurality of circumferential positions on the roller contact surface of the sleeve, and the groove is accommodated in the groove. Is constituted by a concave curved surface having a radius of curvature equivalent to the outer peripheral surface of the roller.

  In the present invention, a groove extending in the axial direction is formed at a plurality of locations in the circumferential direction of the roller contact surface of the sleeve, and the groove in which the roller is accommodated is configured by a concave curved surface having a radius of curvature equivalent to the outer peripheral surface of the roller. Thus, the inner diameter of the sleeve can be increased so that the roller bearing can be assembled to the eccentric shaft.

  By increasing the inner diameter of the sleeve, the contact area between the roller and the sleeve can be increased because the gap between adjacent grooves is thick even if the sleeve is thin. As a result, it can suppress that the fitting force of the sleeve with respect to a roller bearing falls.

  The sleeve in the present invention preferably has a structure made of synthetic resin. If such a structure is adopted, the roller can be firmly supported by the sleeve by utilizing the elastic deformation of the sleeve, and it becomes easy to reliably prevent the roller from falling off.

  Further, the present invention is effective for a roller bearing with a sleeve including a plurality of rollers, a cage that holds the rollers in the circumferential direction, and a sleeve that supports at least one of the inner peripheral side and the outer peripheral side of the rollers. . In this roller bearing with sleeve, the present invention forms a groove extending in the axial direction at a plurality of circumferential positions on the roller contact surface of the sleeve, and the groove containing the roller has a radius of curvature equivalent to the outer circumferential surface of the roller. It is characterized by being composed of a concave curved surface.

  According to the present invention, the concave groove extending in the axial direction is formed at a plurality of circumferential positions on the roller contact surface of the sleeve, and the concave groove in which the roller is accommodated is a concave curved surface having a radius of curvature equivalent to the outer peripheral surface of the roller. By comprising, the inner diameter dimension of a sleeve can be enlarged so that a roller bearing can be assembled | attached to an eccentric shaft.

  By increasing the inner diameter of the sleeve, the contact area between the roller and the sleeve can be increased even if the sleeve is thin, so that the contact area between the rollers and the sleeve can be increased. It can suppress that the fitting force of a sleeve falls.

  As a result, it is possible to prevent the sleeve from coming off from the roller bearing during transport and handling until the roller bearing is assembled to the eccentric shaft, and to reliably prevent the roller from falling off.

In embodiment of this invention, it is sectional drawing which shows the state which mounted | wore the roller bearing with the roller drop-off prevention tool. It is a perspective view which shows the roller drop-off prevention tool of FIG. It is sectional drawing which follows the PP line | wire of FIG. It is a principal part enlarged view of FIG. It is sectional drawing which shows the state before attaching a roller bearing to an eccentric shaft using the roller fall-off prevention tool of FIG. It is sectional drawing which shows the state in the middle of assembling | attaching a roller bearing to an eccentric shaft using the roller fall-off prevention tool of FIG. It is sectional drawing which shows the state after attaching a roller bearing to the eccentric shaft using the roller fall-off prevention tool of FIG. It is a partial front view which shows the roller bearing which consists of a roller and a holder | retainer. It is sectional drawing which follows the QQ line of FIG. It is sectional drawing which shows the state which mounted the conventional roller drop-off prevention tool to the roller bearing. It is a perspective view which shows the roller drop-off prevention tool of FIG. It is sectional drawing which follows the RR line | wire of FIG. It is sectional drawing which shows the state before attaching a roller bearing to an axis | shaft using the roller fall-off prevention tool of FIG. It is sectional drawing which shows the state in the middle of assembling | attaching a roller bearing to an axis | shaft using the roller fall-off prevention tool of FIG. It is sectional drawing which shows the state after assembling | attaching a roller bearing to an axis | shaft using the roller fall-off prevention tool of FIG. It is sectional drawing which shows the state before attaching a roller bearing to an eccentric shaft using the roller fall-off prevention tool of FIG.

  Embodiments of a roller drop-off prevention tool and a roller bearing with a sleeve according to the present invention will be described in detail below with reference to the drawings.

  In the following embodiment, a needle roller bearing in which a roller falls off to the inner peripheral side of the cage by increasing the load capacity is illustrated as an object using the roller fall-off prevention tool. In addition, as an object which uses a roller fall-off prevention tool, other roller bearings, such as a cylindrical roller bearing, may be sufficient without being limited to a needle roller bearing.

  As shown in FIGS. 8 and 9, the needle roller bearing 1 includes a plurality of rollers 2 and a cylindrical cage 3 that holds the rollers 2 in the circumferential direction. The cage 3 is formed with a plurality of pockets 4 along the circumferential direction thereof, and has a pair of flange portions 5 extending radially inward from both axial end portions. The roller 2 is held in the pocket 4 of the cage 3 so as to be able to roll.

  In the needle roller bearing 1 configured as described above, the circumferential width of the pocket 4 of the cage 3 is smaller than the diameter dimension of the roller 2 as shown in FIG. From this, in the needle roller bearing 1 in this embodiment, the roller 2 does not come out to the outer peripheral side of the cage 3.

  On the other hand, as shown in FIG. 9, the inner width dimension between both flange portions 5 of the cage 3 is slightly longer than the axial length of the roller 2 in order to allow the roller 2 to roll. Therefore, at the time of conveyance and handling until the needle roller bearing 1 is assembled to the shaft, the roller 2 falls off to the inner peripheral side of the cage 3.

  Therefore, until the needle roller bearing 1 is assembled to the eccentric shaft, as shown in FIGS. 1 to 3, the roller 2 is attached to the cage 3 by attaching the roller drop prevention tool 21 to the needle roller bearing 1. It is necessary to prevent falling off to the inner peripheral side. FIG. 1 shows a state where a roller drop-off prevention device 21 is mounted on the needle roller bearing 1, FIG. 2 shows a roller drop-off prevention device 21, and FIG. 3 shows a cross section taken along the line P-P in FIG.

  As shown in FIGS. 1 to 3, the roller drop-off prevention device 21 of this embodiment includes a sleeve 22 that is fitted to the inner peripheral side of the roller 2 in the needle roller bearing 1 with a predetermined tightening allowance. The sleeve 22 contacts the roller 2 on the inner peripheral side of the cage 3 and supports the roller 2. The sleeve 22 has a flange portion 23 extending radially outward from the axial end portion thereof.

  As shown in FIGS. 2 and 3, the roller fall-off prevention tool 21 is formed with concave grooves 24 extending in the axial direction at a plurality of locations in the circumferential direction of the outer peripheral surface (roller contact surface) of the sleeve 22. 2 is housed. The concave grooves 24 are formed on the outer peripheral surface of the sleeve 22 at the same arrangement pitch as the pockets 4 of the cage 3.

  The concave groove 24 in which the roller 2 is accommodated is constituted by a concave curved surface (concave arc surface) having a radius of curvature equivalent to that of the outer peripheral surface of the roller 2. Here, the “curvature radius equivalent to the outer peripheral surface of the roller 2” is not only a curvature radius that is completely the same as the curvature radius of the outer peripheral surface of the roller 2, but also a curvature radius that approximates the curvature radius of the outer peripheral surface of the roller 2. It means to include.

  In the roller fall-off prevention tool 21 of this embodiment, the groove 24 extending in the axial direction is formed at a plurality of locations in the circumferential direction of the outer peripheral surface of the sleeve 22, and the concave groove 24 in which the roller 2 is accommodated is defined as the outer peripheral surface of the roller 2. With the concave curved surface having the same radius of curvature, the inner diameter of the sleeve 22 can be increased so that the needle roller bearing 1 can be assembled to the eccentric shaft 18 described later.

  Due to the expansion of the inner diameter of the sleeve 22, as shown in FIG. 4, even if the thickness t at the bottom of the concave groove 24 of the sleeve 22 is reduced, the thickness T between the adjacent concave grooves 24 is large. Therefore, the contact area between the roller 2 and the sleeve 22 can be increased.

  As a result, it can suppress that the fitting force of the sleeve 22 with respect to the needle roller bearing 1 falls. Therefore, it is possible to prevent the sleeve 22 from coming off from the needle roller bearing 1 during transport and handling until the needle roller bearing 1 is assembled to the eccentric shaft 18, and the roller 2 falls off to the inner peripheral side of the cage 3. Can be surely prevented.

  In this embodiment, the roller drop prevention tool 21 having the above-described configuration is used, and the shaft 17 is inserted through the sleeve 22 having a larger inner diameter in the manner shown in FIGS. The needle roller bearing 1 can be assembled to the eccentric shaft 18 (the amount of eccentricity X) that is provided continuously.

The inner diameter D ₁ of the sleeve 22 of this shaft 17 by using the continuously provided by eccentric shaft 18 variation in roller falling-off preventing member 21 so as to be capable needle roller assembly of the bearing 1, roller falling-off prevention device 21, the axis It is set to be larger than the diameter D _{2 of} 17 and smaller than the diameter D ₃ of the eccentric shaft 18 (D ₂ <D ₁ <D ₃ ).

  Until just before the needle roller bearing 1 is assembled to the eccentric shaft 18, as shown in FIG. 5, in the roller fall-off prevention device 21, the sleeve 22 is fitted on the inner peripheral side of the roller 2, so that the roller 2 is moved by the sleeve 22. The retainer 3 is supported and the position of the retainer 3 is regulated by bringing the flange portion 5 of the retainer 3 into contact with the flange portion 23.

  At this time, the roller 2 of the needle roller bearing 1 has a concave groove 24 formed on the roller contact surface of the sleeve 22, and even if the thickness t at the bottom of the concave groove 24 is thin, the gap 2 between the adjacent concave grooves 24. In this case, the contact area between the roller 2 and the sleeve 22 is increased.

  Thereby, since the fitting force of the sleeve 22 with respect to the needle roller bearing 1 can be secured, the sleeve 22 can be prevented from falling off from the needle roller bearing 1, and the roller 2 falls off to the inner peripheral side of the cage 3. Is preventing.

Before the needle roller bearing 1 is assembled to the eccentric shaft 18, as shown in FIG. 5, in the roller drop-off prevention tool 21, the inner diameter D ₁ of the sleeve 22 is larger than the diameter D _{2 of the} shaft 17 and the eccentric shaft. Since the diameter is set to be smaller than the diameter D _{3 of} 18, the shaft 17 can be inserted into the sleeve 22.

  When the needle roller bearing 1 is assembled to the eccentric shaft 18 connected to the shaft 17, as shown in FIG. 6, the end 19 of the eccentric shaft 18 is attached to the roller drop-off prevention tool 21 through which the shaft 17 is inserted. The eccentric shaft 18 is moved in the direction of a white arrow in the figure by contacting the axial end 16 of the sleeve 22.

  As a result, the sleeve 22 is pushed out by the eccentric shaft 18, so that the sleeve 22 comes out of the needle roller bearing 1. In this manner, the needle roller bearing 1 is incorporated into the eccentric shaft 18 as shown in FIG.

  In this case, the sleeve 22 is preferably made of synthetic resin. Thereby, by utilizing the elastic deformation of the sleeve 22, the roller 2 can be firmly supported on the outer periphery of the sleeve 22, and it is easy to reliably prevent the roller 2 from falling off.

  In the above embodiment, the needle roller bearing 1 in which the roller 2 falls off on the inner peripheral side of the cage 3 is illustrated as the needle roller bearing 1 using the roller fall-off prevention tool 21. When the roller 2 falls off on the outer peripheral side, a sleeve that supports the outer peripheral side of the roller 2 may be used, although not shown. By using the roller drop prevention tool provided with such a sleeve, the roller 2 can be prevented from dropping to the outer peripheral side of the cage 3.

  The present invention is not limited to the above-described embodiments, and can of course be implemented in various forms without departing from the gist of the present invention. It includes the equivalent meanings recited in the claims and the equivalents recited in the claims, and all modifications within the scope.

1 Roller bearing (Needle roller bearing)
2 Rollers 3 Cage 18 shaft (eccentric shaft)
21 Roller fall prevention tool 22 Sleeve 24 Groove

Claims (3)

A roller bearing comprising a plurality of rollers and a cage that holds the rollers in the circumferential direction is provided with a sleeve that supports at least one of the inner peripheral side and the outer peripheral side of the rollers, and the rollers are supported by the sleeve A roller fall-off prevention tool for assembling the roller bearing to the shaft in a state where
Concave grooves extending in the axial direction are formed at a plurality of locations in the circumferential direction of the roller contact surface of the sleeve, and the concave grooves in which the rollers are accommodated are configured by concave curved surfaces having a radius of curvature equivalent to the outer peripheral surface of the rollers. Roller fall prevention tool characterized by   The roller fall-off prevention device according to claim 1, wherein the sleeve is made of a synthetic resin. A roller bearing with a sleeve, comprising: a plurality of rollers; a cage that holds the rollers in a circumferential direction; and a sleeve that supports at least one of an inner peripheral side and an outer peripheral side of the rollers,
Concave grooves extending in the axial direction are formed at a plurality of locations in the circumferential direction of the roller contact surface of the sleeve, and the concave grooves in which the rollers are accommodated are configured by concave curved surfaces having a radius of curvature equivalent to the outer peripheral surface of the rollers. A roller bearing with a sleeve.

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