JP6770808B2 - Roller drop prevention device and roller bearing with sleeve - Google Patents

Description

The present invention relates to a roller bearing composed of a plurality of rollers and a cage, and relates to a roller drop prevention tool and a roller bearing with a sleeve for preventing the rollers from falling off on the inner peripheral side thereof.

For example, in roller bearings used in automobiles and various industrial machines, by arranging the pillars of the cage only on the outer diameter side, a large number of rollers can be arranged, but the rollers fall off on the inner diameter side. There are roller bearings.

As shown in FIGS. 6 and 7, 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 has a plurality of pockets 4 formed along its circumferential direction, and has a pair of flange portions 5 extending radially inward from both ends in the axial direction. The roller 2 is rotatably held in the pocket 4 of the cage 3.

In the roller bearing 1 having the above configuration, as shown in FIG. 6, the circumferential width of the pocket 4 of the cage 3 is smaller than the diameter dimension of the roller 2. From this, the roller 2 does not come out of the cage 3.

On the other hand, the inner width dimension between the 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, in order to increase the number of rollers, there is no pillar portion of the cage on the inner diameter side, so that the rollers 2 fall off inside the cage 3 during handling until the roller bearing 1 is assembled to the shaft. It will be.

Therefore, until just before assembling the roller bearing 1 to the shaft, it is necessary to prevent the roller 2 from falling inside the cage 3 by attaching a roller drop prevention tool to the roller bearing 1.

As shown in FIG. 8, the conventional roller drop prevention tool 11 includes a sleeve 12 fitted on the inner peripheral side of the roller 2 in the roller bearing 1 (see, for example, FIG. 4 of Patent Document 1). The sleeve 12 contacts the roller 2 inside the cage 3 and supports the roller 2. Further, the sleeve 12 has a flange portion 13 extending radially outward from the axial end portion thereof.

Until just before assembling the roller bearing 1 to the shaft 14, as shown in FIG. 8, in the roller drop prevention tool 11, the roller 2 is supported by the sleeve 12 by fitting the sleeve 12 on the inner peripheral side of the roller 2. The position of the cage 3 is restricted by bringing the flange portion 5 of the cage 3 into contact with the flange portion 13.

When assembling the roller bearing 1 to the shaft 14, as shown in FIG. 9, in the roller drop prevention tool 11, the end portion 15 of the shaft 14 is brought into contact with the axial end portion 16 of the sleeve 12, and the shaft 14 is brought into contact with the shaft 14. Move in the direction of the white arrow in the figure. As a result, the sleeve 12 is pushed out by the shaft 14, and the sleeve 12 comes out of the roller bearing 1. In this way, as shown in FIG. 10, the roller bearing 1 is incorporated into the shaft 14.

Jikkenhei 4-56921 Gazette

By the way, in the conventional roller drop prevention tool 11, the thickness of the sleeve 12 is uniform over the entire circumference. When assembling the roller bearing 1 composed of the rollers 2 and the cage 3 to the shaft 14, if the shaft 14 is single, the roller bearing 1 can be attached as described above by using the conventional roller drop prevention tool 11. It can be easily assembled to the shaft 14 (see FIGS. 8 to 10).

However, when assembling the roller bearing 1 of the above type to the eccentric shaft 17, in particular, as shown in FIGS. 11 and 12, the roller bearing 1 is externally attached to the shaft 18 and then connected to the shaft 18. When assembling the roller bearing 1 to the eccentric shaft 17, it is difficult to assemble the roller bearing 1 to the eccentric shaft 17 by using the conventional roller drop prevention tool 11.

That is, in the roller drop prevention tool 11, as shown in FIG. 11, if the thickness of the sleeve 12 is uniform and too large, the roller bearing 1 is extrapolated to the shaft 18 before assembling the roller bearing 1 to the eccentric shaft 17. (Refer to the X arrow in the figure).

On the other hand, as shown in FIG. 12, if the thickness of the sleeve 12 is uniform and too small, the sleeve 12 and the eccentric shaft 17 are less likely to be caught (see the Y arrow in the figure), and the sleeve 12 is difficult to be pushed out by the eccentric shaft 17. There is a risk of becoming.

Therefore, the present invention has been proposed in view of the above-mentioned problems, and an object of the present invention is to easily attach a roller bearing to an eccentric shaft connected to the shaft after externally inserting the roller bearing into the shaft. It is an object of the present invention to provide a roller drop prevention device and a roller bearing with a sleeve that can be assembled in the above.

As a technical means for achieving the above-mentioned object, the present invention has a sleeve that supports the inner peripheral side of a roller with respect to a roller bearing including a plurality of rollers and a cage that holds the rollers in the circumferential direction. It is a roller drop prevention tool that attaches the roller bearing to the eccentric shaft connected to the shaft after externally inserting the roller bearing from the shaft. The inner circumference of the sleeve is used as the eccentric shaft with respect to the outer circumference of the sleeve. It is also characterized by being eccentric.

Further, the present invention prevents a plurality of rollers, and a roller bearing comprising a cage holding the circumferential direction rollers for roller bearings, the dropping rollers and supports the inner peripheral side of the roller, the roller A sleeve for assembling the roller bearing to the eccentric shaft connected to the shaft after externally inserting the bearing from the shaft is provided, and the sleeve has a flange portion extending radially outward from the axial end portion thereof. However, it is effective for roller bearings with sleeves in which the inner circumference of the sleeve is eccentric with respect to the outer circumference.

In the present invention, the inner circumference of the sleeve is eccentric with respect to the outer circumference of the sleeve in accordance with the eccentric shaft, so that the roller bearing can be externally attached to the shaft before assembling the roller bearing to the eccentric shaft. Further, when assembling the roller bearing to the eccentric shaft, the sleeve and the eccentric shaft are sufficiently hooked, the axial end of the sleeve can be surely brought into contact with the end of the eccentric shaft, and the sleeve is the eccentric shaft. It becomes easy to be pushed out.

In the present invention, it is desirable to have a structure in which the outer circumference of the sleeve is inclined with respect to the axis line and the maximum outer diameter of the outer circumference is made larger than the inscribed circle diameter of the roller. If such a structure is adopted, the rollers can be firmly supported at the maximum outer diameter portion of the outer circumference of the sleeve, so that the rollers can be reliably prevented from falling off.

The sleeve in the present invention preferably has a structure in which slits extending in the axial direction are formed at a plurality of positions in the circumferential direction. If such a structure is adopted, the rollers can be firmly supported by the elastic deformation of the sleeve due to the slit, so that the rollers can be reliably prevented from falling off.

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

According to the present invention, the inner circumference of the sleeve is eccentric with respect to the outer circumference of the sleeve so as to be aligned with the eccentric shaft, so that the roller bearing can be externally attached to the shaft before assembling the roller bearing to the eccentric shaft. Further, when assembling the roller bearing to the eccentric shaft, the sleeve and the eccentric shaft are sufficiently hooked, the axial end of the sleeve can be surely brought into contact with the end of the eccentric shaft, and the sleeve is the eccentric shaft. It becomes easy to be pushed out.

As a result, it is possible to realize a roller drop prevention device in which the roller bearing can be externally attached to the shaft and the roller bearing can be easily assembled to the eccentric shaft connected to the shaft.

It is sectional drawing which shows the state before assembling the roller bearing to an eccentric shaft by the roller drop prevention tool of embodiment of this invention. It is sectional drawing which shows the state in the process of assembling the roller bearing to the eccentric shaft by the roller drop prevention tool of embodiment of this invention. It is sectional drawing which shows the state after assembling the roller bearing to the eccentric shaft by the roller drop prevention tool of embodiment of this invention. It is a front view which shows the fall-off prevention tool of FIG. It is a perspective view which shows the roller drop prevention tool of FIG. It is a partial front view which shows the roller bearing which consists of a roller and a cage. It is sectional drawing which follows the PP line of FIG. It is sectional drawing which shows the state before assembling the roller bearing to a shaft by the conventional roller drop prevention tool. It is sectional drawing which shows the state in the process of assembling the roller bearing to the shaft by the conventional roller drop prevention tool. It is sectional drawing which shows the state after assembling the roller bearing to the shaft by the conventional roller drop prevention tool. It is sectional drawing which shows an example of assembling a roller bearing to an eccentric shaft by a conventional roller drop prevention tool. It is sectional drawing which shows the other example of assembling the roller bearing to the eccentric shaft by the conventional roller drop prevention tool.

An embodiment of the roller dropout prevention tool according to the present invention will be described in detail below with reference to the drawings. The object to which the roller drop prevention tool of this embodiment is used is a needle roller bearing in which the rollers fall off on the inner diameter side in order to increase the load capacity. In the following embodiments, the needle roller bearing will be described, but the present invention is not limited to this, and may be a cylindrical roller bearing.

As shown in FIGS. 6 and 7, 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 has a plurality of pockets 4 formed along its circumferential direction, and has a pair of flange portions 5 extending radially inward from both ends in the axial direction. The roller 2 is rotatably held in the pocket 4 of the cage 3.

In the needle roller bearing 1 having the above configuration, as shown in FIG. 6, the circumferential width of the pocket 4 of the cage 3 is smaller than the diameter dimension of the roller 2. From this, the roller 2 does not come out of the cage 3.

On the other hand, the inner width dimension between the 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 a large number of rollers are arranged, there is no pillar on the inner diameter side of the cage. Therefore, when handling the needle roller bearing 1 until it is assembled to the shaft, the rollers 2 are inside the cage 3. It will drop out.

Therefore, until just before assembling the needle roller bearing 1 to the shaft, it is necessary to prevent the roller 2 from falling inside the cage 3 by attaching a roller drop prevention tool to the needle roller bearing 1.

As shown in FIG. 1, the roller drop prevention tool 21 of this embodiment includes a sleeve 22 fitted on the inner peripheral side of the roller 2 in the needle roller bearing 1. The sleeve 22 contacts the roller 2 inside the cage 3 and supports the roller 2. Further, the sleeve 22 has a flange portion 23 extending radially outward from the axial end portion thereof.

The roller drop prevention tool 21 has a structure in which the inner circumference of the sleeve 22 is eccentric with respect to the outer circumference of the sleeve 22 in accordance with the eccentric shaft 17.

In this embodiment, the roller drop prevention tool 21 having the above-described configuration is used, and as shown in FIG. 1, the needle roller bearing 1 is externally attached to the shaft 18, and the eccentricity connected to the shaft 18 is connected. A case where the needle roller bearing 1 is assembled to the shaft 17 will be illustrated. The diameter of the shaft 18 located in the previous stage of assembling the needle roller bearing 1 to the eccentric shaft 17 is φA, the diameter of the eccentric shaft 17 is φB (φA <φB), and the eccentric amount of the eccentric shaft 17 with respect to the shaft 18 is C.

At this time, in the drop-out prevention tool 21, the outer diameter φD of the sleeve 22 is set to be slightly larger than the outer diameter φB of the eccentric shaft 17. Further, the inner diameter φE of the sleeve 22 is set to be larger than the outer diameter φA of the shaft 18 and smaller than the outer diameter φB of the eccentric shaft 17 (φA <φE <φB). When assembling, the eccentric direction of the eccentric shaft 17 with respect to the shaft 18 and the eccentric direction of the inner circumference of the sleeve 22 with respect to the outer circumference of the sleeve 22 are substantially matched.

In the roller drop prevention tool 21, the inner circumference of the sleeve 22 is eccentric with respect to the outer circumference of the sleeve 22 in accordance with the eccentric shaft 17 so as to satisfy the above conditions.

Until just before assembling the needle roller bearing 1 to the eccentric shaft 17, as shown in FIG. 1, the roller 2 is formed by fitting the sleeve 22 on the inner peripheral side of the roller 2 in the roller drop prevention tool 21. The cage 3 is supported and the position of the cage 3 is restricted by bringing the flange portion 5 of the cage 3 into contact with the flange portion 23.

In the previous stage of assembling the needle roller bearing 1 to the eccentric shaft 17, as shown in FIG. 2, the inner diameter φE of the sleeve 22 is set to be larger than the outer diameter φA of the shaft 18 in the roller drop prevention tool 21. The needle roller bearing 1 can be externally attached to the shaft 18.

When assembling the needle roller bearing 1 to the eccentric shaft 17, since the inner diameter φE of the sleeve 22 is set smaller than the outer diameter φB of the eccentric shaft 17, the sleeve 22 is located on the eccentric side of the eccentric shaft 17 with respect to the shaft 18. The axial end 24 comes into contact with the end 25 of the eccentric shaft 17. Since the sleeve 22 is thick on the eccentric side of the eccentric shaft 17, the axial end 24 of the sleeve 22 is reliably abutted and locked to the end 25 of the eccentric shaft 17.

From this state, the eccentric shaft 17 is moved in the direction of the white arrow in the figure. As a result, the sleeve 22 is pushed out by the eccentric shaft 17, and the sleeve 22 comes out of the needle roller bearing 1. In this way, as shown in FIG. 3, the needle roller bearing 1 is incorporated into the eccentric shaft 17.

As described above, in the roller drop prevention tool 21, the needle roller bearing 1 is assembled to the eccentric shaft 17 by eccentricizing the inner circumference of the sleeve 22 with respect to the outer circumference of the sleeve 22 in accordance with the eccentric shaft 17. Then, the needle roller bearing 1 can be externally attached to the shaft 18.

Further, when assembling the needle roller bearing 1 to the eccentric shaft 17, the sleeve 22 and the eccentric shaft 17 are sufficiently hooked, and the axial end 24 of the sleeve 22 is surely hit by the end 25 of the eccentric shaft 17. It can be brought into contact, and the sleeve 22 is easily pushed out by the eccentric shaft 17.

As a result, it is possible to realize a roller drop prevention tool 21 capable of externally inserting the needle roller bearing 1 onto the shaft 18 and then easily assembling the needle roller bearing 1 to the eccentric shaft 17 connected to the shaft 18. ..

Further, as shown in FIG. 4, the roller drop prevention tool 21 has a structure in which the outer circumference of the sleeve 22 is inclined with respect to the axis line, and the maximum outer diameter φDmax of the outer circumference is made larger than the inscribed circle diameter φF of the roller 2. Equipped. By adopting such a structure, the roller 2 can be firmly supported at the maximum outer diameter portion of the outer circumference of the sleeve 22, so that the roller 2 can be reliably prevented from falling off.

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

In this embodiment, the flange portion side end portion of the sleeve 22 is set to the maximum outer diameter φDmax, and the sleeve 22 is inclined at an angle θ so as to be reduced in diameter toward the anti-flange portion side end portion. The radial portion may be any portion in the axial direction.

Further, as shown in FIG. 5, the sleeve 22 of the roller drop prevention tool 21 has a structure in which slits 26 extending in the axial direction are formed at a plurality of positions in the circumferential direction. By adopting such a structure, the roller 2 can be firmly supported by the elastic deformation of the sleeve 22 by the slit 26, so that the roller 2 can be reliably prevented from falling off. ..

Also in this case, the sleeve 22 is preferably made of synthetic resin. As a result, by utilizing the elastic deformation of the sleeve 22, the roller 2 can be firmly supported on the outer circumference of the sleeve 22, and it becomes easy to prevent the roller 2 from falling off.

It is preferable that the slit 26 is formed not only from one side of the sleeve 22 on the flange portion side or the anti-flange portion side, but also from both the flange portion side and the anti-flange portion side. By forming the slits 26 that are notched from both sides of the sleeve 22 in this way, the sleeve 22 can be elastically deformed uniformly in the axial direction, so that the roller 2 can be prevented from falling off even more reliably.

The number of slits 26 is preferably 2 to 4, but the number is arbitrary. If the number of slits 26 is too small, the amount of elastic deformation of the sleeve 22 is small, and it becomes difficult to reliably prevent the rollers 2 from falling off. On the contrary, if the number of slits 26 is too large, the rigidity of the sleeve 22 is lowered and the sleeve 22 is greatly deformed, so that the holding force of the roller 2 may be reduced.

The present invention is not limited to the above-described embodiments, and it goes without saying that the present invention can be implemented in various forms without departing from the gist of the present invention. Indicated by the scope of the claim and further includes the equal meaning described in the claims, and all modifications within the scope.

1 roller bearing (needle roller bearing)
2 Roll 3 Cage 17 Eccentric shaft 18 Axis 21 Roll fall prevention device 22 Sleeve 26 Slit

Claims (5)

For a roller bearing composed of a plurality of rollers and a cage for holding the rollers in the circumferential direction, a sleeve for supporting the inner peripheral side of the rollers is provided, and the roller bearings are externally inserted onto a shaft. A roller drop prevention tool for assembling roller bearings to an eccentric shaft connected to the shaft.
A roller drop prevention tool characterized in that the inner circumference of the sleeve is eccentric with respect to the outer circumference of the sleeve in accordance with the eccentric axis. The roller drop prevention tool according to claim 1, wherein the outer circumference of the sleeve is inclined with respect to the axis, and the maximum outer diameter of the outer circumference is made larger than the inscribed circle diameter of the roller. The roller drop prevention tool according to claim 1 or 2, wherein the sleeve has a structure in which slits extending in the axial direction are formed at a plurality of positions in the circumferential direction. The roller drop prevention tool according to any one of claims 1 to 3, wherein the sleeve is made of synthetic resin. A roller bearing consisting of a plurality of rollers and a cage that holds the rollers in the circumferential direction.
To support the inner peripheral side of the roller with respect to the roller bearing to prevent the roller from falling off, to externally insert the roller bearing to the shaft, and then to assemble the roller bearing to the eccentric shaft connected to the shaft. Equipped with a sleeve
The sleeve is a roller bearing with a sleeve, which has a flange portion extending radially outward from the axial end portion thereof, and has an eccentric inner circumference of the sleeve with respect to the outer circumference.

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