JPH0636342Y2 - 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. 11, 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 of this type of component, 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.

Then, in the case of assembling this, to explain with reference to FIG. 11 as an example, first, while fixing the spacer 13 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 lower flange 16 on the other side. It was fixed by abutting on the inner ring 12b of the radial ball bearing 12.

(Problems to be solved by the invention) However, in the roller having the above configuration, in order to prevent dust and the like from entering the radial ball bearings 11 and 12 and deteriorating the performance, both inner sides of the radial ball bearings 11 and 12 are prevented. A so-called W-seal structure having a seal member S disposed therein is used. The radial ball bearings 11 and 12 have a large number of constituent parts and are complicated to assemble, resulting in high cost. It had a drawback that it would end up.

Further, the inner or outer end portions of the upper or lower flanges 15 and 16 need contact portions 15a and 16a with the inner rings 11b and 12b to fix the radial ball bearings 11 and 12, and the spacer 13
Is also provided between the outer rings 11a, 12a of the radial ball bearings 11, 12 so as to abut against them, etc., the accuracy of the shape and dimensions of each member is required, and this also contributes to the high cost. It had a difficulty in manufacturing.

Further, there is a drawback that the radial ball bearings 11 and 12 have clearances (4 places) which cause rotational vibration of the roller body 14.

The present invention has been proposed in view of the above points, and an object of the present invention is to eliminate the need for radial ball bearings, which cause the highest cost, and simplify the shapes of the components to facilitate the production of each component. While reducing the parts cost,
To provide a roller that has a small number of constituent parts, can be reduced in size and weight, is easy to assemble, and can greatly reduce the cost as a whole, and can obtain practically sufficient rotation accuracy. is there.

(Means for Solving the Problems) That is, in order to achieve the above object, the present invention is a shaft-shaped shaft having a concave ball receiving portion for receiving a part of the ball, and An outer race, which is provided on the outer circumference of the shaft, has a tapered portion in contact with the ball to rotatably hold the ball, and has an adjustable clearance, and an outer race on the inner peripheral surface of the shaft. Of the roller body, which is provided on the inner peripheral surface of the roller body, and is provided with a cylindrical sleeve that prevents the balls from falling off during assembly, and the inner peripheral surface of the outer race and the outer peripheral surface of the shaft. The gist is that a dustproof gap is formed between them.

(Function) In the present invention, the ball is rotatably held by the concave ball receiving portion formed on the outer peripheral surface of the shaft and the tapered portion of the outer race provided in the roller body, and the inner peripheral surface of the outer race is held. A dustproof gap is formed between the outer peripheral surfaces of the shaft. The sleeve is provided inside the roller body to prevent balls from falling off during assembly, reducing the number of parts, simplifying the shape, facilitating assembly, and reducing size and weight to achieve cost reduction. While trying to achieve the above, we are trying to obtain sufficient performance for practical use.

(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 is a shaft having a substantially cylindrical shape, and a pair of arc-shaped recesses formed on the upper and lower portions of the outer peripheral portion of the shaft 1 by cutting or the like. The ball receiving portions 1a are formed so as to be separated from each other, and a suitable number of spherical balls 2 are partly rotatably received in these ball receiving portions 1a. Reference numeral 3 denotes a cylindrical outer race which is provided at the upper and lower sides, and the inner end is formed in a tapered shape, and the tapered portion 3a whose diameter gradually increases toward the inner side holds the ball 2 provided at the upper and lower sides. Therefore, each of them abuts the ball 2, and the inner peripheral surface 3b is the outer peripheral surface of the shaft 1.
It is not in contact with 1b and forms a dustproof gap g. Then, a 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. Further, a cylindrical sleeve 5 is provided between the pair of outer races 3 which are separated from each other. This sleeve 5 is for preventing the ball 2 from falling off during assembly, and its outer peripheral surface is fixed to the inner peripheral surface of the roller body 4, its outer ends are located near the ball 2, and the outer race 3 , The ball 2, the shaft 1, etc. are not in contact with each other. In addition, 6 is fixed to the upper end of the shaft 1 and has an upper flange that is not in contact with the roller body 4 and the outer race 3, and 7 has a mounting part 7a for mounting on a chassis (not shown), etc. 1 is a lower flange fixed to the lower end portion of 1.

In assembling, first, the sleeve 5 is press-fitted into the inside of the roller body 4 substantially at the center thereof, and the shaft 1 is inserted therein. Then, an appropriate number of upper or lower balls 2 are put into the corresponding ball receiving portions 1a, and grease or oil is injected into the portions. After that, the outer race 3 located on the side of the opening of the roller body 4 is inserted to press the ball 2 by the tapered portion 3a, and the outer race 3 is fixed to an appropriate position on the inner peripheral surface of the roller body 4. To do. After that, insert the ball 2 on the opposite side, the outer race 3 etc. in the same way, and insert the upper and lower flanges 6,
7 may be fixed to each end of the shaft 1. In the assembly process described above, it is possible to check the rotation accuracy of the roller body 4 before fixing the upper and lower flanges 6 and 7, and to adjust the position of the outer race 3 to ensure clearance with the ball 2. It is possible to easily adjust and obtain suitable rotation performance, and thus the roller body 4 can be rotatably supported with respect to the shaft 1. It should be noted that the intrusion of dust and the like into the ball portion can be prevented extremely by the inner peripheral surface 3b of the outer race 3 being close to the outer peripheral surface 1b of the shaft 1, and by the dustproof gap g of this minute gear.

FIG. 2 shows a second embodiment of the present invention. In this embodiment, the roller body 4 of the first embodiment is used as the bearing body 4A on the fixed side, and the pulley 1, disk, turntable is provided at the upper end of the shaft 1. Alternatively, it is characterized in that the rotating body 6A such as a drum is fixed and the shaft 1 can be used while being rotatable with respect to the bearing body 4A. The other structure is similar to that of the first embodiment, and the description thereof is omitted.

FIG. 3 shows a third embodiment of the present invention. In this embodiment, the outer race 3 is slidably fitted to the inner peripheral surface of the roller body 4 without being fixed, and the outer race 3 is provided on the outer side thereof.
In addition, the outer race retainers 8 fixed to the inner peripheral surface of the roller body 4 are used for fixing. In this case, the upper and lower outer race retainers 8 or either one of them is made of an elastic member such as rubber and comes into contact with the ball 2. It is characterized in that a preload is applied to the outer race 3 to prevent play due to wear of the ball transfer surface.

The other structure is similar to that of the first embodiment.

FIG. 4 shows a fourth embodiment of the present invention. In this embodiment, an elastic member such as a spring 9 is contracted between the outer race 3 and the outer race retainer 8 so that the outer race 3 is preloaded. Is given.

FIG. 5 shows a fifth embodiment of the present invention. In this example, one of the outer race retainers has an outer race adjusting screw 8A structure, and the inner peripheral surface of the roller body 4 is screwed with the screw portion. The matching screw portion 4a is formed, and the position of the outer race 3 is adjusted by the outer race adjusting screw 8A for adjusting the clearance so that the clearance between the ball 2 and the outer race 3 can be adjusted. The other outer race retainer 8 is fixed to the roller body 4.

FIG. 6 shows a sixth embodiment of the present invention. In the first to fifth embodiments, the ball portion is provided at two places, but in each of the following embodiments, the ball portion is shown at one place.

That is, a ball receiving portion 1a, which is an arcuate recess, is formed in a part of the outer peripheral portion of the cylindrical shaft 1, and the taper of the outer race 3 fixed to the inner peripheral surface of the ball receiving portion 1a and the roller body 4. The ball 2 is rotatably held by the portion 3a. A cylindrical sleeve 5 fixed to the inner peripheral surface of the roller body 4 is provided in the vicinity of the ball 2 and the tapered portion 3a of the outer race 3. in this case,
A dustproof gap g is formed between the inner peripheral surface of the outer race 3, the inner peripheral surface of the sleeve 5 and the outer peripheral surface of the shaft 1.

For assembly, the sleeve 5 is fixed in the roller body 4, the shaft 1 is inserted therein, and the ball 2
Insert an appropriate number from the other opening side and position it in the ball receiving portion 1a. In this case, the ball 2 does not come off
Are prevented by Then, the outer race 3 may be inserted into the roller body 4 from the taper portion 3a side and fixed in an appropriate position.

FIG. 7 shows a seventh embodiment of the present invention, which is different from the sixth embodiment in that a sleeve 4'extending toward the shaft 1 is integrally formed on the inner peripheral surface of one end of the roller body 4. It is connected. Other configurations are the same.

FIG. 8 shows an eighth embodiment of the present invention. In this embodiment, the outer race 3 in the sixth embodiment is loosely fitted inside the roller body 4 and is composed of an elastic member arranged outside thereof. The outer race retainer 8 is used to fix the outer race 3, and the elasticity of the outer race retainer 8 applies a preload to prevent backlash due to wear of the ball transfer surface. The other structure is similar to that of the sixth embodiment.

FIG. 9 shows a ninth embodiment of the present invention, in which the outer end of the outer race 3 loosely fitted in the roller body 4 and the inner end of the outer race retainer 8 fixed in the roller body 4 are separated from each other. The elastic member 9 such as a spring is contracted between them so that the outer race 3 is preloaded, which is different from the eighth embodiment. In this case, it goes without saying that the outer race retainer 8 need not be a separate elastic member.

FIG. 10 shows a tenth embodiment of the present invention. In this example, an outer race adjusting screw 8A is provided on the outer periphery of the outer race 3 and on the inner peripheral portion of the roller body 4, whereby the clearance can be adjusted.

In the third to tenth embodiments, the roller body 4 is the bearing body 4A as in the second embodiment.
Of course, it is also possible to use the shaft 1 rotatably with respect to the bearing body 4A.

In each of the above embodiments, the outer race is barrel polished during the manufacturing process. Therefore, instead of the tapered portion, even if it is a cylindrical outer race, the angle will be slightly rounded when barrel polishing, so it is possible to use this outer race to receive the ball at that portion. is there.

(Effect of the Invention) As described above, according to the present invention, a concave ball receiving portion is formed in a shaft without using a radial ball bearing, and the outer race provided on the inner peripheral surface of the ball receiving portion and the roller body. Since the ball is held rotatably by the taper part of, the dust-proof gap is formed between the outer race and the shaft, and the sleeve is provided to prevent the ball from falling off during assembly, ) The expensive radial ball bearing having the W-seal structure is unnecessary, and the cost can be reduced accordingly.

(B) The minimum number of parts around the shaft is the ball, outer race, sleeve, and roller body. The outer race is also used as a dustproof member, reducing the number of parts compared to the past, and Since the shape is simple, it is easy to manufacture, the cost of parts is low, and the assembly is easy.

(C) Since a part of the ball is housed in the ball receiving portion of the shaft, the size can be reduced, and the weight can be reduced because the number of parts is small.

(D) The clearance can be adjusted arbitrarily and easily by finely adjusting the position of the outer race during assembly.

And so on.

[Brief description of drawings]

1 to 10 are respectively the first to the tenth of the present invention.
The sectional views showing the internal structure of the embodiment, and FIGS. 11 and 12 are conventional examples. 1 …… Shaft, 1a …… Ball receiving part, 2 …… Ball,
3 ... Outer race, 4 ... Roller body, 4A ... Bearing body, 5 ... Sleeve

Claims (1)

[Scope of utility model registration request] 1. A shaft having a cylindrical shape, and a concave ball receiving portion for receiving a part of a ball formed on an outer peripheral portion thereof; and a shaft provided on the outer periphery of the shaft and having a tapered portion contacting the ball An outer race capable of holding a ball rotatably in cooperation with the ball receiving portion and having an adjustable clearance, and a roller body fixed to the inner peripheral surface of the outer race and located outside the shaft, A cylindrical sleeve that is provided on the inner peripheral surface of the roller body and that prevents the balls from falling off during assembly is provided, and a dustproof gap is formed between the inner peripheral surface of the outer race and the outer peripheral surface of the shaft. Roller.