JPS6350490Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an improvement of a plastic needle retainer used in a needle bearing.

(Prior art) Generally, as a needle retainer for needle bearings made of plastic,
The one disclosed in Japanese Patent No. 58-42424 and the like is known.

That is, the needle holder includes a column 12 and a needle holder 1, as shown in FIGS. 19 to 23.
3 are arranged alternately, and the protrusions 1 are arranged on the upper end surface of the column 12.
4 and a plurality of needle-like protrusions 15 formed around the retainer body 11, which is made of plastic and is fitted into the protrusion 14 on the inner surface at a position facing the protrusion 14. It is composed of a ring-shaped side plate 16 made of plastic, which forms a recess 17 and a shallow recess 18 around which the needle-like protrusion 15 is received.

Thus, the cage body 11 is inserted into the recess 17 of the side plate 16.
At the same time, the needle-like protrusion 1
5 is inserted into the shallow recess 18, its tip is brought into contact with the inner surface of the shallow recess 18, and when ultrasonic vibration is applied while applying a constant pressure, the needle-shaped protrusion 15 and the shallow recess 18 are separated. It melts, and the cage main body 11 and the side plate 16 are integrated.

However, in the needle retainer, the needle-like protrusion 15 formed on the upper end surface of the column body 12 is melted in a small shallow recess 18 formed on the inner surface of the side plate 16, so that the retainer body 11 and the side plate 16 are integrated. Therefore, during melting, excess resin is extremely likely to overflow into the joint surface and the needle holding portion 13, and in this case, there is a problem that defective products are produced and quality is deteriorated.

Furthermore, when the needle-like protrusion 15 exceeds a predetermined size or the depth of the shallow recess 18 becomes less than a predetermined size, excess resin may overflow onto the joint surface and the needle retainer 13 during melting. Therefore, the cage main body 11 and the side plates 16 do not come into good contact with each other. As a result, there is a problem in that the cage main body 11 and the side plates 16 require extremely high processing accuracy.

Furthermore, since the cage main body 11 and the side plate 16 are integrated by melting and fixing the extremely small needle-like protrusions and the shallow recesses 18, the strength of the welded portion is low;
There is a problem in that the side plates tend to come off in the axial direction, resulting in weak strength.

Furthermore, since the outer diameter of the protrusion 14 of the cage main body 11 and the inner diameter of the recess 17 of the side plate 16 are selected to be approximately the same diameter, it is difficult to fit the protrusion 14 and the recess 17, making the assembly work difficult. There is also the problem that it cannot be done simply and easily.

In particular, in the case of small cages for miniature bearings, the above-mentioned problems become even more pronounced.

(Problems to be solved by the invention) This invention was devised to solve each of the above-mentioned problems, and its purpose is to prevent the molten resin from protruding and improve the assembly strength. Another object of the present invention is to provide a plastic needle holder that is simple and easy to assemble.

(Means for Solving the Problem) The plastic needle holder of the present invention has a plurality of pillars formed by vertically cutting out the circumferential wall of a cylindrical body with a constant width and spacing. In the plastic needle holder, the plastic needle holder is composed of a plastic holder main body forming a needle holding part, and a ring-shaped plastic side plate fixed to the upper end surface of the pillar by ultrasonic welding. A recess consisting of a circumferential groove and a smaller recess formed in the bottom of the circumferential groove is bored in the upper end surface of the body or the inner surface of the side plate, and the upper end surface of the columnar body or On the inner surface of the side plate, a tapered surface is fitted into the recess and is welded by ultrasonic welding by abutting against the inlet periphery of the recess, and a pointed end is welded by ultrasonic welding by abutting against the bottom surface of the recess. The present invention is characterized in that it has a protrusion having a projection body and a needle-like spire portion that abuts the bottom surface of the circumferential groove and is welded by ultrasonic welding when the depression and the protrusion fit together.

(Function) After vertically inserting the needle into the needle holding part of the retainer body, the side plate is arranged to face the upper end surface of the columnar body of the retainer body, and the protrusion is fitted into the recessed part of the concave part. At the same time, the spire section is positioned within the circumferential groove of the recess, and the retainer main body and side plate are assembled, and then, while applying pressure, the recess and the protrusion, and the circumferential groove and the spire section are ultrasonically welded and held. The main body and side plate are fixed and integrated.

Furthermore, during ultrasonic welding of the cage body and side plates, excess molten resin collects in the circumferential groove formed around the recess, completely preventing molten resin from spilling out when welding the cage body and side plates. be done. Furthermore, since the recess and the protrusion and the circumferential groove and the spire are fused and fixed, the number of welded areas increases and the assembly strength is significantly improved. Furthermore, since the circumferential groove is formed around the recess, the protrusion can be easily fitted into the recess, and the cage body and the side plate can be assembled satisfactorily and easily.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

1 to 9 show a plastic needle holder according to a first embodiment of the present invention, and the needle holder is composed of a holder main body 1 and a ring-shaped side plate 2. FIG.

That is, the cage body 1 is made by integrally molding a so-called engineering plastic, such as hard nylon or polyacetate, which has excellent heat resistance, corrosion resistance, and wear resistance, and as shown in FIGS. 1 and 2.
A plurality of needle holding portions 4 are formed between each columnar body 3 formed by vertically cutting the peripheral wall of a cylindrical body with a constant width and interval. As shown in FIG. 2, the contact surface 4a of the needle holder 4 with the needle 5 is finished with a concave surface along the outer peripheral surface of the needle 5 in order to hold the needle 5, and the needle 5 inserted from above is inside the needle holder 4. It will be stored and supported vertically.

As shown in FIGS. 3 and 4, the side plate 2 is formed into a ring shape with the same inner and outer diameters as the cage body 1 by integral molding of engineering plastic, similar to the cage body 1. It is fixed to the upper end surface 3a of the column 3 of No. 1 by ultrasonic welding.

Then, the upper end surface 3 of the columnar body 3 of the cage main body 1
a or the inner surface 2a of the side plate 2, there is a recess A consisting of a circumferential groove 6 and a recess 7; A protrusion 8 that fits into the recess 7 of the recess A and a needle-shaped spire 9 that can be positioned within the circumferential groove 6 of the recess A are formed, respectively. By fitting, the cage main body 1 and the side plates 2 are assembled with a predetermined positional relationship regulated.

That is, in this embodiment, the inner surface 2 of the side plate 2
A concave portion A is formed on the upper end surface 3a of the column 3 of the cage main body 1, and a protrusion 8 and a spire portion 9 are formed on the upper end surface 3a of the column 3 of the cage main body 1, respectively.

A recess A formed in the inner surface 2a of the side plate 2
consists of a circumferential groove 6 and a recess 7, as shown in FIGS. 5 and 6.

The circumferential groove 6 is formed in a substantially rectangular shape with an appropriate depth, and functions to allow a portion of the molten resin to flow into the circumferential groove when the cage main body 1 and the side plate 2 are welded together. The bottom surface 6a of the groove 6 becomes a welding part during ultrasonic welding.

Further, the recessed portion 7 is formed in a circular shape smaller than the circumferential groove 6 on the bottom surface 6a of the circumferential groove 6, and has a smaller circular shape than the inner circumferential surface 7.
a is straight, and the peripheral edge of the inlet has an enlarged diameter. This inner circumferential surface 7a is used as a guide for the protrusion 8 when the protrusion 8 is fitted into the recess 7, and the entrance periphery and bottom surface 7b of the recess 7 serve as a welding part during ultrasonic welding.

On the other hand, on the upper end surface 3a of each column 3 of the cage main body 1, a protrusion 8 and a spire portion 9 are formed, respectively, as shown in FIGS. 7 and 8.

The protrusion 8 has a substantially cylindrical shape, and has a tapered surface 8a whose diameter increases on the proximal end side, and an inner circumferential surface 7 of the recessed portion 7.
It has a straight outer circumferential surface 8b that makes surface contact with a, and a conical tip 8c that comes into contact with the bottom surface 7b of the recess 7. The tapered surface 8a abuts on the peripheral edge of the entrance of the recess 7, and the pointed end 8c abuts on the bottom surface 7b of the recess 7, forming a welded portion during ultrasonic welding.

Further, the steeple portions 9 have a needle shape, and are formed in plural numbers on the upper end surface 3a of the columnar body 3 at positions such that they fit within the circumferential groove 6 when the projection body 8 is fitted into the recessed portion 7. The height of the spire portion 9 is set such that when the protrusion 8 is fitted into the recess 7, the tip portion comes into contact with the bottom surface 6a of the circumferential groove 6. This steeple portion 9 becomes a melting portion during ultrasonic welding.

Next, assembly of the needle holder will be explained.

First, the needles 5 are vertically inserted into each needle holding portion 4 of the holder body 1 from above.

Next, the side plate 2 is arranged above the column 3 of the cage main body 1, the protrusion 8 is fitted into the recess 7 of the recess A, and the steeple part 9 is positioned within the circumferential groove 6 of the recess A. Then, the cage main body 1 and side plate 2 are assembled. In this case, since the circumferential groove 6 is formed around the recessed part 7,
Fitting of the protrusion 8 into the recess A becomes extremely easy. Furthermore, by fitting the protrusion 8 into the recess 7 of each recess A, the mutual assembly position of the retainer body 1 and the side plate 2 is regulated extremely accurately, and the needle retainer and the needle 5 are Alignment will be performed automatically.

Then, when ultrasonic vibration is applied while applying a constant pressure to the cage body 1 and the side plate 2, the tip 8c of the protrusion 8 is brought into contact with the bottom surface 7b of the recess 7, and the tapered surface 8a of the projection 8 is brought into contact with the recess 7. The spire portions 9 collide with the bottom surfaces 6a of the circumferential grooves 6 at the peripheral edges of the inlet, respectively, and the colliding portions are melted by frictional heat.

As the melting progresses in each of the colliding parts, the cage body 1
and the side plate 2 are close to each other in the axial direction, and the upper end surface 3 of the columnar body 3
When a and the inner surface 2a of the side plate 2 come into complete surface contact, they are fixed and integrated (see FIG. 9).

Note that the molten resin flows into the circumferential groove 6 and is absorbed, and there is no overflow to the joint surfaces or the like. or,
The melting mainly occurs in the recess A, the protrusion 8, and the spire part 9.
This occurs at the collision part of the cage body 1 and the side plate 2, and since the straight portions of the two hardly melt, the accuracy of assembling the cage body 1 and the side plate 2 will not deteriorate. Furthermore, since there are a plurality of welding locations, the adhesion strength between the cage main body 1 and the side plates 2 is improved.

FIG. 10 is a sectional view of the main parts of a needle holder according to a second embodiment of the present invention, and the holder includes:
A tapered through hole 10 communicating with the outside, that is, the outer surface of the side plate 2 is bored in the bottom surface 7b of the recess 7 of the side plate 2, and the through hole 10 is formed smaller than the inner diameter of the recess 7. There is. In this way, no large pressure is generated between the recess 7 and the protrusion 8 during melting, the through hole 10 becomes a place where the molten resin accumulates, and no molten resin protrudes. Also, through hole 10
The gas and air can be removed from the cage body 1.
The assembly of the side plates 2 and 2 can also be done very well and easily. Further, when the molten resin flows into the through hole 10 and solidifies, the resin becomes difficult to escape from the through hole 10, and the strength of the assembly between the cage body 1 and the side plate 2 is significantly increased. Note that the through hole 10 may not be formed in a tapered shape, but may be formed in a straight shape, and may be bored in that direction so as to communicate with the inner circumferential surface or the outer circumferential surface of the side plate 2.

11 and 12 are a cross-sectional view of the main part of the retainer body 1 and a perspective view of the protrusion 8 of the needle retainer according to the third embodiment of the present invention. 8c is shaped like a mortar. With such a formation, the number of collision parts between the tip 8c and the bottom surface 7b of the recess 7 increases, the number of welded parts increases, and the fixing force improves.

13 to 15 are a side view of the main parts of the holder body 1 of the needle holder according to the fourth embodiment of the present invention, a perspective view of the protrusion 8, and a sectional view of the side plate 2. and the recess 7 of the recess A that fits therein are each formed in the shape of a cross, and the protrusion 8 is provided with a tapered surface 8a and a pointed end 8c. With such a shape, the number of collision parts between the tip 8c of the protrusion 8 and the bottom surface 7b of the recess 7 increases, the number of welded parts increases, and the fixing force improves.

16 to 18 are sectional views of the main parts of the holder body 1, a perspective view of the protrusions 8, and sectional views of the side plate 2 of the needle holder according to the fifth embodiment of the present invention. 8 and the recess 7 of the recess A that fits therein are each formed in a square shape, and the protrusion 8 has a tapered surface 8a and a pointed end 8c. With this shape, the tip 8c of the protrusion 8 and the recess 7
The number of parts that collide with the bottom surface 7b increases, the number of welded parts increases, and the adhesion strength improves.

In the above embodiment, the shape of the circumferential groove 6 is approximately square, but the present invention is not limited to that of the above embodiment, and the shape may be arbitrary.

Further, in the above embodiment, the upper end surface 3 of the columnar body 3
Although four spire portions 9 are formed in a, the present invention is not limited to that of the above embodiment, and the number, shape, etc. of the spire portions are arbitrary.

Furthermore, in the above embodiment, the protrusion 8 and the spire portion 9 are provided on the upper end surface 3a of the column 3 of the cage main body 1.
Although recesses A were formed on the inner surface 2a of the side plate 2,
The formation positions of the protrusion 8, the spire part 9, and the recess A may be reversed, or the protrusion 8, the spire part 9, and the recess A may be formed in the opposite positions.
They may be formed in half on the same member.

In addition, in the above embodiment, the needle holder is formed into a straight type, and the cylindrical needle 5
However, the needle holding part 4
By forming the needle contact surface 4a in a tapered shape, it is also possible to use a truncated conical needle.

(Effects of the Invention) Since the present invention has the above configuration, it has many excellent advantages as described below.

(1) Since a circumferential groove is formed around the recess, excess resin will flow into the circumferential groove and accumulate during ultrasonic welding between the cage body and the side plate, resulting in damage to the upper end surface of the column and the side plate. It is possible to reliably prevent the molten resin from overflowing between the inner surface of the needle and the inside of the needle holding part. This is especially advantageous for extremely small cages for miniature bearings.

(2) If a circumferential groove is formed around the recess, even if the length of the protrusion is greater than a specified dimension or the depth of the recess is less than a specified dimension, the excess resin will be removed from the circumference during melting. Since it can flow into the groove, a certain amount of leeway can be made in the dimensional accuracy of the protrusions and depressions. As a result, high machining accuracy is not required for the height of the protrusion or the depth of the recess, and manufacturing costs can be reduced. Since these parts are melted and fixed, the number of welded parts is increased compared to conventional cages, and the strength of the assembly between the cage body and side plates is significantly increased.

(4) Welding between the cage main body and the side plate mainly occurs at the collision area between the recess and protrusion of the recess, and the circumferential groove of the recess and the spire, and the straight parts of both are hardly melted, so it is difficult to maintain the retainer. The assembly accuracy of the device will not deteriorate.

(5) Since a larger circumferential groove is formed around the recess, it is possible to fit the protrusion into the recess well and easily, making it an extremely small retainer for miniature bearings. Assembly is extremely simple and easy.

[Brief explanation of drawings]

Fig. 1 is a front view of the holder main body of the needle holder according to the first embodiment of the present invention, Fig. 2 is a plan view thereof, Fig. 3 is a front view of the side plate of the needle holder, and Fig. 4 is the same. 5 is a plan view, FIG. 5 is an enlarged sectional view taken along the - line in FIG. 4, FIG. 6 is a perspective view of the main parts of the side plate, and FIG.
The figures are an enlarged cross-sectional view taken along the line - - of Fig. 2, Fig. 8 is a perspective view of the main parts of the cage body, and Fig. 9 is a partial enlarged sectional view showing the state in which the protrusion of the cage main body and the recess of the side plate are fixed. , FIG. 10 is a partially enlarged sectional view showing the fixed portion between the holder main body and the side plate of a needle holder according to a second embodiment of the present invention, and FIG. 11 is a needle holder according to a third embodiment of the present invention. FIG. 12 is a perspective view of a protrusion of the retainer body, and FIG. 13 is an enlarged sectional view of the retainer body of a needle retainer according to the fourth embodiment of the present invention. Enlarged side view of
FIG. 14 is a perspective view of the protrusion of the retainer body,
Figure 15 is also an enlarged sectional view of the main part of the side plate,
FIG. 6 is an enlarged sectional view of the main part of the holder body of the needle holder according to the fifth embodiment of the present invention, FIG. 17 is a perspective view of the protrusion of the holder body, and FIG. FIG. 19 is a front view of the cage main body of a conventional needle cage, FIG. 20 is a partially cutaway front view of the side plate, and FIG. 21 is an enlarged perspective view of the main part of the cage main body. , FIG. 22 is an enlarged sectional view of the main part of the side plate, and FIG. 23 is a partial enlarged sectional view showing the fixed portion between the cage main body and the side plate. 1 is the cage body, 2 is the side plate, 2a is the inner surface of the side plate, 3 is the column, 3a is the upper end surface of the column, 4 is the needle holding part, 6 is the circumferential groove, 6a is the bottom surface of the circumferential groove, 7 is the 7b is the bottom of the recess, 8 is the protrusion, 8a is the tapered surface of the protrusion, 8c is the tip of the protrusion, 9 is the steeple, and A is the recess.

Claims (1)

[Scope of utility model registration request] A plastic cage main body 1 having a plurality of needle holding portions 4 formed between each columnar body 3 formed by vertically cutting a circumferential wall of a cylindrical body with a constant width and interval, and the columnar body 1. In a plastic needle holder constructed of a ring-shaped plastic side plate 2 fixed to the upper end surface 3a of the column 3 by ultrasonic welding, the upper end surface 3a of the column 3 or the inner surface 2a of the side plate 2 is , a recess A consisting of a circumferential groove 6 and a smaller recess 7 formed in the bottom surface 6a of the circumferential groove 6 is bored, and at a position facing the recess A, the upper end surface 3a of the column 3 or the side plate 2 is formed. inner surface 2a of
A tapered surface 8 is fitted into the recess 7, abuts against the peripheral edge of the entrance of the recess 7, and is welded by ultrasonic welding.
a and a protrusion 8 having a pointed end 8c that abuts against the bottom surface 7b of the recess 7 and is welded by ultrasonic welding;
A plastic needle holder characterized in that a needle-shaped spire part 9 is provided in a protruding manner to abut the bottom surface 6a of the circumferential groove 6 and be welded by ultrasonic welding when the recessed part 7 and the protrusion 8 are fitted together. vessel.