JP2547697Y2 - Rotary body support device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a rotating body support device that rotatably supports a rotating body such as an idler pulley provided in a tape recorder on a substrate.

2. Description of the Related Art Conventionally, as shown in FIG. 2, one end of a center hole c of a boss b protruding from the center of one side of a rotating body (for example, a pulley) a is inserted into a shaft press-fitting hole e of a synthetic resin substrate d. 2. Description of the Related Art A rotator supporting device that rotatably supports a rotator a on a substrate d by being fitted to a press-fixed support shaft f is known.

(Problem to be Solved by the Invention) By the way, in order to reduce the rotational load due to the friction between the rotating body a and the support shaft f, it is desirable to make the support shaft f thin.

However, the above-described conventional rotating body supporting device is configured such that the load applied to the rotating body a is received only by the supporting shaft f.
For this reason, when the support shaft f is made thinner, the strength decreases. For example, when the support shaft f is pressed into the shaft press-fitting hole e, when the rotating body a is mounted on the support shaft f, or when the device is transported, the support shaft f is used. When an unexpected load is applied to f, or when excessive lateral pressure acts on the rotating body a, the support shaft f may be bent. Therefore, it is difficult in design to make the support shaft f thin.

Further, even if a lubricant such as grease is applied to the support shaft f, when the rotating body a is mounted on the support shaft f, since the lubricant is scraped off, the friction between the rotating body a and the support shaft f is reduced. It has been difficult to effectively reduce. Further, as the support shaft f is thinner and longer, it becomes more difficult for the lubricant to penetrate between the support shaft f and the center hole c, and a countermeasure has been desired. Further, since fine dust easily adheres to the lubricant adhering to the periphery of the support shaft f, the fine dust enters between the support shaft f and the center hole c, and the rotating body a and the support shaft f are seized. There was also a fear that it would happen. In addition, g in FIG. 2 is a member for retaining the rotating body a.

The present invention has been made in view of the above circumstances, and aims to reduce the rotational load of the rotating body by making the support shaft thinner, and to prevent the shaft from bending even if the support shaft is long, and furthermore, the support shaft and the center hole It is an object of the present invention to provide a rotating body supporting device capable of sufficiently penetrating lubricating oil therebetween and further preventing dust from entering between a supporting shaft and a center hole.

(Means for Solving the Problems) In order to achieve the above object, the rotating body support device of the present invention comprises:
The synthetic resin substrate surrounds the boss of the rotating body to prevent the boss from tilting, thereby integrally forming a cylindrical body for restricting the deflection of the support shaft, and forming a cone at the center of the bottom surface of the cylindrical body. A recess shall be provided. In addition, a large-diameter expanding hole portion that is continuous with the center hole is provided at the center of the tip of the boss portion. Further, a large-diameter lubricant reservoir is provided on the inner periphery of the distal end of the cylindrical body.

(Operation) Even when a lateral pressure acts on the rotating body, the inclination of the boss portion is prevented by the cylindrical body, and as a result, the bending of the supporting shaft is regulated. Therefore, the supporting shaft is made thinner to reduce the rotating load of the rotating body. It becomes possible. In addition, since the conical concave portion is provided in the shaft press-fitting hole at the center of the bottom surface of the cylindrical body, even when the cylindrical body is deep, the support shaft uses the conical concave portion as a guide for the shaft press-fitting hole provided in the inner bottom surface. Can be easily press-fitted, and an undesired load can be prevented from being applied to the support shaft during the press-fitting. Moreover, when the lubricant is applied to the support shaft and the rotating body is mounted, the scraped-off lubricant collects in the conical concave portion, or collects in the conical concave portion and the expanding hole at the tip of the boss portion, and the rotating body rotates. Accordingly, the liquid gradually penetrates between the support shaft and the center hole of the boss. Furthermore, since the lubricant that leaks to the outside through the gap between the boss and the cylinder is stored in the lubricant reservoir at the tip of the cylinder, unless the lubricant is supplied excessively, There is no leakage to the outside.

(Example) Hereinafter, one example of the present invention will be described. FIG. 1 is a sectional view of the rotating body supporting device of the present invention.

In the figure, reference numeral 1 denotes an idler pulley (rotating body) made of synthetic resin.
A main substrate (synthetic resin substrate) 2 made of synthetic resin is rotatably supported. That is, the center hole 4 of the boss portion 3 integrally projecting from the center of one side of the idler pulley 1 is rotatably fitted to a support shaft 6 having one end press-fitted and fixed to the shaft press-fit hole 5 of the main substrate 2, The retaining shaft 8 is retained by a retaining member 8 fitted in an annular engaging groove 7 at the tip of the support shaft 6. A cylindrical body 9 surrounding the boss 3 is formed integrally on one side surface of the main substrate 2. At the center of the bottom surface of the cylindrical body 9, a conical concave portion 10 concentric with the shaft press-fitting hole 5 is provided. A large-diameter lubricant reservoir 9a is provided on the inner periphery of the distal end of the cylindrical body 9. On the other hand, at the center of the tip of the boss 3, a large-diameter expanding hole 11 that is continuous with the center hole 4 is provided.

When the surface of the support shaft 6 is coated with a lubricant such as grease and the center hole 4 of the boss portion 3 of the idler pulley 1 is fitted on the support shaft 6, the boss portion 3 is housed in the cylindrical body 9. You. In this state, the attachment of the idler pulley 1 is completed by fitting the retaining member 8 into the engagement groove 7 at the tip of the support shaft 6.

When the idler pulley 1 is attached, the lubricant on the surface of the support shaft 6 accumulates in the space defined by the opening portion 11 and the conical concave portion 10. Since it gradually penetrates between the holes 4, there is no trouble in supplying lubricant for a long time. The lubricant accumulated in the space tends to leak to the outside through a gap between the outer periphery of the boss 3 and the cylinder 9, but the lubricant accumulation section 9 a is formed on the inner periphery of the distal end of the cylinder 9. Is provided, the lubricant does not leak out of the cylindrical body 9 unless the lubricant is applied excessively. Therefore, a sufficient amount of lubricant can be supplied between the support shaft 6 and the center hole 4, so that seizure does not occur.

Also, even if the tension of the transmission belt acts on the idler pulley 1 as a side pressure, or an unexpected load is applied at the time of conveyance or the like, the amount of deflection of the support shaft 6 is limited to the inner circumference of the cylindrical body 9 and the outer circumference of the boss 3. Is restricted by the contact, so that the support shaft 9 can be made thin.

(Effects of the Invention) As described above, the rotating body supporting device of the present invention has a cylindrical body surrounding the boss portion of the rotating body integrally formed on a synthetic resin substrate, and a conical concave portion provided at the center of the bottom of the cylindrical body. It is.

Therefore, even if a side pressure acts on the rotating body, the deflection of the support shaft can be restricted by the contact between the inner circumference of the cylindrical body and the outer circumference of the boss portion. This facilitates the guide function, so that the support shaft can be made thin to reduce the rotational load of the rotating body. In addition, when the lubricant is applied to the support shaft and the rotating body is mounted, the lubricant collects in the conical concave portion or in the conical concave portion and the expansion hole, and the center of the support shaft and the boss portion is rotated as the rotating body rotates. Since it gradually penetrates between the holes, there is no trouble in supplying lubricant for a long time. Furthermore, since the lubricant that leaks to the outside through the gap between the boss and the cylinder is stored in the lubricant reservoir at the tip of the cylinder,
As long as the lubricant is not supplied excessively, it does not leak out.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a rotating body supporting device of the present invention, and FIG. 2 is a sectional view showing a conventional rotating body supporting device. DESCRIPTION OF SYMBOLS 1 ... Idler pulley (rotary body), 2 ... Main board (substrate made of synthetic resin), 3 ... Boss part, 4 ... Center hole, 5 ... Shaft press-fitting hole, 6 ... Support shaft, 9 ... Cylindrical body, 9a ... Lubricant reservoir, 10 ... Conical recess, 11 ... Expansion hole.

Claims (3)

(57) [Scope of request for utility model registration] 1. A center hole (4) of a boss (3) projecting from the center of one side surface of a rotating body (1) is press-fitted and fixed at one end to a shaft press-fitting hole (5) of a synthetic resin substrate (2). A rotator supporting device that rotatably supports the rotator on the substrate by being fitted to a support shaft, wherein the boss is fitted to the support shaft on the substrate. A cylindrical body (9) surrounding the part (3) to prevent the boss from tilting and restricting the deflection of the support shaft is integrally formed, and a conical recess (10) is provided at the center of the bottom surface of the cylindrical body. A rotating body support device characterized by the above-mentioned. 2. The rotating device according to claim 1, wherein a large-diameter expanding hole portion (11) continuous with the center hole (4) is provided in a center portion of a tip end of the boss portion (3). Body support device. 3. The rotating body support device according to claim 1, wherein a large-diameter lubricant reservoir (9a) is provided on an inner periphery of a distal end portion of the cylindrical body (9).