JPH0121237Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Field of Use This invention is used in guide rollers, link mechanisms, etc. of general industrial machinery, and particularly relates to a cam follower inserted into a cam groove in which two guide surfaces are arranged facing each other.

BACKGROUND ART As shown in FIG. 1, a conventional cam follower has rolling elements 3 disposed between an outer ring 1 and a stepped shaft member 2 which has a rolling element guide collar at the shaft end and also serves as an inner ring. In addition, a collar 4 for sealing and positioning is provided on the shaft member 2.
is inserted, and the shaft member 2 is fastened to the mounting member 5 with a nut 6.

Problems to be Solved by the Invention As shown in FIG. 2, the cam follower has a cam groove 8 having two mutually parallel guide surfaces 7 and 7'.
However, it is necessary to provide a gap S between the outer peripheral surface of the outer ring 1 and one guide surface 7' of the cam groove 8. That is, if the outer ring 1 of the cam follower is brought into contact with both guide surfaces 7, 7', the rolling direction of the outer ring 1 with respect to each guide surface will be reversed, resulting in the inconvenience that rotation will not be possible. However, this gap S causes extremely undesirable play in many machines. To eliminate this backlash, place the cam follower in two locations and
The guide surfaces 7 and 7' had to be brought into contact with each other separately.

This invention aims to provide a cam follower that ensures good operability and prevents play from occurring between the cam follower and the guide surface of the cam groove.

Means for Solving the Problems This invention involves arranging two rows of bearings, each of which rotatably supports an outer ring via rolling elements, on one shaft member, and offsets the center of rotation of these bearings. By doing so, one bearing is brought into contact with one of the opposed guide surfaces of the cam groove, and the other bearing is brought into contact with the other guide surface.

Embodiment FIG. 3 shows a cam follower as an embodiment of this invention, in which reference numeral 9 denotes two mutually parallel guide surfaces 10, 1.
0', 11 is a stepped shaft member having a rolling element guide flange at the shaft end, and 12 is a stepped shaft member with rolling elements 14 disposed between the large diameter portion 11a of the shaft member 11 and the outer ring 13. 1 bearing. 15 is a second bearing whose rotation center is offset from the first bearing 12; an eccentric ring 16 is attached to the small diameter portion 11b of the shaft member 11; A moving body 18 is arranged. In this example, both outer rings 1
3 and 17 have the same outer diameter. Then, the first and second bearings 12 and 15 and the first and second bearings of the cam groove 9 are
The relationship between the guide surfaces 10 and 10' is as follows. That is, the outer ring 13 of the first bearing 12 contacts the first guide surface 10 of the cam groove 9, and there is a gap between the outer ring 13 and the second guide surface 10'. 17 is the second guide surface 1 of the cam groove 9
0' and the first guide surface 10, there is a gap. The amount of eccentricity between the first bearing 12 and the second bearing 15, that is, the distance between the axes in the cross section of the cam groove 9 corresponds to the dimension between the guide surfaces 10 and 10' of the cam groove 9. In the example case, eccentric ring 1
The amount of eccentricity can be changed by changing the angular position of 6.

In addition, in the figure, 19 is a mounting member for attaching the shaft member 11, 20 is a nut for fastening the shaft member 11 to the mounting member 19, and 21 is a first bearing 12 and a second bearing.
This is a spacer disposed between the bearing 15 and the bearing 15.

According to this embodiment, two bearings 12 and 15 having the same outer diameter are arranged side by side on one shaft member 11, and the rotation centers of both bearings 12 and 15 are offset to form a bearing outer ring 1.
3 and 17 contact only the separate guide surfaces 10 and 10', so that the guide surfaces 10 and 1
It is possible to eliminate play between 0' and the outer rings of both bearings can rotate smoothly, resulting in good operability.

In the above embodiment, an eccentric ring is interposed to make the bearing eccentric, but it is also possible to eliminate the eccentric ring by forming an eccentric portion integrally with the shaft member. Even in that case, the amount of eccentricity can be changed depending on the angular position of the shaft member 11.

Effects of the invention In this invention, bearings are arranged in two rows on one shaft member, and the centers of rotation of both bearings are shifted so that they come into contact with separate guide surfaces. It is possible to eliminate play between the opposing guide surfaces, and since the rolling motion of each bearing is completely guaranteed, good operation can be achieved. Furthermore, by adjusting the amount of eccentricity, the gap (preload amount) between the bearing and the cam groove guide surface can be adjusted. Furthermore, the cam groove does not require any modification, so it is very economical.

In addition, when an eccentric ring is interposed as in the embodiment, the amount of eccentricity of the two bearings can be changed by changing the angular position of the eccentric ring, so it is possible to accommodate cam grooves of various sizes. This also provides the advantage of being able to easily adjust the preload at any time.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a conventional cam follower, FIG. 2 is a view showing the cam follower pushed into a cam groove, and FIG. 3 is a cross-sectional view showing an embodiment of the cam follower of this invention. 9...Cam groove, 10, 10'...Guide surface, 11
... Shaft member, 12 ... First bearing, 15 ... Second
bearing, 16... eccentric ring.

Claims (1)

[Scope of utility model registration request] In a cam follower that is inserted into a cam groove having two guide surfaces parallel to each other and rolls along the guide surfaces, a bearing is provided in which an outer ring is rotatably supported on one shaft member via a rolling element. A cam follower characterized in that the two bearings are arranged in parallel in two rows, and the centers of rotation of the two bearings are offset so as to abut on separate guide surfaces.