JPH0645692Y2 - roller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a roller, more specifically to a roller suitable for use in a video cassette recorder or the like.

(Prior Art) Conventionally, as a roller of this type, as shown in FIG. 9, a pair of radial ball bearings 11 and 12 are arranged above and below the outer peripheral portion of the shaft 10, and the radial ball bearings 11 and 12 are A cylindrical spacer 13 is arranged between the outer rings 11a and 12a to position the radial ball bearings 11 and 12 relative to each other, and the roller body 14 is fixed to their outer circumferences.
The roller body 14 is rotatably attached to the shaft 10, or as another application example of this type of part, as shown in FIG.
Fix it as A, and fix the rotating body 15A such as pulley, disk and turntable to the end of the shaft 10,
I was trying to rotate the 0 side.

In the case of assembling this, taking FIG. 9 as an example, first, while the spacer 13 is fixed in the roller body 14, for example, the upper flange 15 is fixed to the shaft 10, and the upper radial ball bearing 11 is fixed. Put the spacer 13 in the roller body 14 already fixed, then insert the shaft 10 into the inner ring 11b of the radial ball bearing 11, insert the radial ball bearing 12 on the opposite side, and then insert the other lower flange 16. It was fixed by abutting on the inner ring 12b of the radial ball bearing 12.

However, in the roller having the above structure, the seal members S are arranged on both inner sides of the radial ball bearings 11 and 12 in order to prevent dust and the like from entering the radial ball bearings 11 and 12 and deteriorating the performance. The so-called W-seal structure is used, and the radial ball bearings 11 and 12 have a large number of constituent parts and are complicated to assemble, so that they have a drawback of high cost.

Therefore, a roller which does not use a radial ball bearing which causes the highest cost and has various other advantages has already been proposed by the applicant as No. 62-71471.

FIG. 11 shows such a roller. In this roller, a concave ball receiving portion formed on the outer peripheral surface of the shaft 1 is used.
The ball 2 is rotatably held by 1a and the tapered portion 3a of the outer race 3 provided in the roller body 4, and dust is prevented between the inner peripheral surface 3b of the outer race 3 and the outer peripheral surface 1b of the shaft 1. A gap g is formed. The sleeve 5 is provided in the roller body 4 in consideration of preventing the balls 2 from falling off during assembly, and the number of parts is reduced, the shape is simplified, the assembly is facilitated, and the size is reduced in order to achieve cost reduction.・ We are trying to achieve practically sufficient performance while aiming for weight reduction. 6 and 7 are the upper and lower flanges, 7
a is a mounting part.

However, in the roller having the above-mentioned configuration, it is planned that the ball 2 arranged around the shaft 1 will be a full ball, and in this case, the balls come into contact with each other at a medium speed rotation or higher and noise and mechanical loss occur. There was a problem.

Therefore, as shown in Japanese Utility Model Laid-Open No. 62-91020, the applicant of the present invention has already proposed a ball which is held at an appropriate interval to generate noise and reduce mechanical loss.

However, since this roller is provided with the cylindrical sleeve for preventing the balls from falling off, there is a problem that the assembly is complicated and the assembly parts are required.

(Means for Solving Problems) The present invention has been proposed in view of the above points, and an object of the present invention is to provide a roller that does not require the sleeve, can be easily assembled, and can reduce the cost. Especially.

(Operation) In the present invention, the sleeve is not used to improve the assemblability,
In addition, the retainers hold the balls at appropriate intervals so that the balls are separated from each other so that they do not collide with each other, and noise and mechanical loss are minimized.

(Embodiment) Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a first embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a shaft having a substantially cylindrical shape, and the upper and lower portions of the outer peripheral portion of the shaft 1 are cut from an arc-shaped recess by cutting or the like over the entire circumference. Therefore, a pair of ball receiving portions 1a forming the R-shaped ball transfer surface are formed apart from each other, and a proper number of spherical balls 2 are partially rotatably received in these ball receiving portions 1a. , The transfer surface of the ball 2 is configured. Reference numeral 3 is a cylindrical outer race provided in the upper and lower sides, respectively, and a tapered portion 3a having an inner diameter gradually increasing toward the inner side is formed. The tapered portion 3a contacts the ball 2 to hold the ball 2. Contact and the ball receiving part
Together with 1a, it forms a transfer surface for rotatably holding the ball 2. The inner peripheral surface 3b on the outer side is not in contact with the outer peripheral surface 1b of the shaft 1 and forms a dustproof gap g. Then, a hollow cylindrical roller body 4 is provided on the outer periphery of the outer race 3, and the outer peripheral surface of the outer race 3 is fixed to the inner peripheral surface of the roller body 4 by adhesion.

The balls 2 are held by a retainer 5 at appropriate intervals.

The retainer 5 has a ring shape and is made of a thick elastic member such as synthetic resin or rubber.
The balls 2 are held at appropriate intervals, and in this case, the balls 2 are held through ball receiving portions formed of holes that are approximately equal to or slightly smaller than the ball diameter, and the retainer 5 has a clearance between the balls 2 that does not allow the balls 2 to come out. It has a structure in which the ball 2 is forcibly inserted into the one that is attached to. In addition, the retainer 5 may have a normal structure as shown in FIG. 3 or an elastic member having a notch 5a formed in part as shown in FIG. 4 and having an easily deformable inner diameter. Is also good.

Note that other configurations of the entire roller are substantially the same as those shown in FIG.

Then, in assembly, as shown in FIG. 5, the retainer 5 in which the ball 2 is previously assembled is pushed into the outer periphery of the shaft 1. In this case, the retainer 5 is slightly spread outward by the shaft 1 and the ball 2 in contact therewith, as indicated by the arrow. In other words, the retainer 5 is naturally larger in diameter than the shaft 1, but when the ball 2 is attached to the outer periphery of the shaft, the retainer 5 has such a diameter that it can be pushed outward slightly against the elastic force caused by its material. There is. Then, as shown in FIG. 5, the retainer 5 is pushed in, and when the retainer 5 reaches the ball receiving portion 1a, the retainer 5 shrinks by that amount, and the ball 2 does not fall out, and the ball receiving portion 1a
Are mounted on the outer circumference of each. After that, this assembly is inserted into the roller body 4, and the outer race 3 is inserted from the outside, respectively, so that the roller body 4 can be assembled to the shaft 1 without using a sleeve. That is, the transfer surface of the outer race 3 is a tapered portion that can be inserted from the end side of the roller body 4 when the roller body 4 is positioned on the outer periphery of the shaft 1 in which the balls 2 are incorporated during assembly.
Since it is formed in 3a, it is extremely easy to assemble.

In addition, when used, dust or the like is prevented from entering the ball portion because the inner peripheral surface 3b of the outer race 3 is close to the outer peripheral surface 1b of the shaft 1. obtain.

FIG. 6 shows a second embodiment of the present invention. In this embodiment, a pair of ball receiving portions formed on the outer periphery of the shaft 1
The feature is that the spacing of 1a is narrowed and the retainer 5A has a structure in which the balls 2 are provided in two stages correspondingly. The basic material and structure of the retainer 5A are the same as those of the above-mentioned embodiment.

As shown in FIG. 7, when assembling, the ball 2 assembled in the retainer 5A is first applied to the outer periphery of the shaft 1 and is pushed toward the ball receiving portion 1a side as shown by the arrow. Go.

Then, as shown in FIG. 7, when the ball 2 located on the lower side in the figure first reaches the upper ball receiving portion 1a, the ball 2 is fitted into the ball receiving portion 1a by the elastic force of the retainer 5A. At this time, the upper ball portion is still pushed outward.

Then, when further pushed in, the upper and lower two-stage balls 2 are fitted into the respective ball receiving portions 1a as shown in FIG. 7, and the balls 2 can be mounted on the outer periphery of the shaft 1.

In each of the above embodiments, the tapered portion 3a is formed on the inner end portion of the outer race 3, but instead of the tapered portion 3a, as shown in FIG. A curved surface having a larger R shape than the R shape of the outer peripheral surface of the ball may be used as the ball transfer surface.

(Effect of the Invention) As described above, according to the present invention, the balls are held at appropriate intervals through the retainer, and the retainer prevents the balls from falling out, so that the assembly is easy and suitable for mass production. In addition, the number of parts can be reduced, and the cost can be reduced. In addition, the transfer surface of the outer race is designed to be inserted from the end of the roller body when the roller body is positioned on the outer periphery of the shaft that incorporates the balls during assembly. The position of can be finely adjusted and desired rotation performance can be obtained.

[Brief description of drawings]

1 to 5 show a first embodiment of the present invention. FIG. 1 is a vertical cross-sectional view of a main part, FIG. 2 (a) is a plan view of a retainer in which a ball is incorporated, and (b) is (A) A sectional view taken along the line AA in the drawings, FIGS. 3 and 4 show other examples of the retainer,
FIG. 5 is an assembly process diagram, FIG. 6 and FIG.
Is a second embodiment of the present invention, in which FIG. 6 is a schematic longitudinal sectional view of essential parts, FIGS. 7 to 7 are explanatory views of the assembling process, FIG. 8 is another embodiment, and FIGS. Each is a conventional example. 1 …… Shaft, 1a …… Ball receiving part, 2 …… Ball,
3 ... Outer race, 3a ... Tapered part, 4 ... Roller body, 5 ... Retainer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-59-77122 (JP, A) Actually open 62-91020 (JP, U) Actually open 59-59528 (JP, U) Actually open 54- 118537 (JP, U) Actual opening Sho 59-37426 (JP, U) Actual opening Sho 62-124920 (JP, U) Actual opening Sho 59-113513 (JP, U) Actual public Sho 57-44520 (JP, Y2) Actual public Sho 62-6334 (JP, Y2)

Claims (1)

[Scope of utility model registration request] 1. A shaft having a substantially cylindrical shape having a concave ball receiving portion for receiving a part of a ball on an outer peripheral portion, and a shaft provided on the outer periphery of the shaft and spaced apart from each other, and contacting the ball. An outer race having a transfer surface for holding the ball rotatably in cooperation with the ball receiving portion, and the outer race fixed to the inner peripheral surface and arranged substantially concentrically on the outer periphery of the shaft. A hollow cylindrical roller body, and a retainer that is located between the shaft and the outer race and is made of an elastic member that holds the balls at appropriate intervals, and the transfer surface of the outer race is
A taper surface or a ball outer peripheral surface that can be inserted from the end side of the roller main body while the roller main body is positioned on the outer periphery of the shaft in which the ball is assembled at the time of assembly, and the inner diameter gradually increases toward the inside. R than R shape
A roller having a large curved surface.