JPS6126648Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to the improvement of a plastic bearing, and in the plastic bearing in which the outer ring is formed by combining and fixing the outer ring segments,
This invention relates to a plastic bearing that improves the workability, assemblability, and assembly strength of the outer ring, improves the rolling properties of the balls, and further reduces the number of parts by integrally forming a dustproof plate on either the inner ring or the outer ring.

(Prior art) Plastic bearings have been developed in the past, which take advantage of plastic's excellent moldability to form divided pieces such as the outer ring, and then combine and glue the two divided pieces to form the outer ring, etc. being developed.
(Jikko No. 39-31563, etc.).

However, in all conventional plastic bearings of this kind, the two divided pieces forming the outer ring are fixed together using an adhesive or the like, and there is a problem in terms of adhesive strength.

In addition, since the adhesive surface when the two divided pieces are assembled and fixed is located at the center of the ball rolling surface of the outer ring in cross-sectional view (that is, the horizontal plane passing through the center of the ball and the adhesive surface of both divided pieces are (because the horizontal plane through which it passes is located on the same plane), the ball rolls while exactly contacting the adhesive line of the outer wheel rolling surface,
The problem is that the rolling properties of the ball are extremely poor.

Furthermore, adhesives and the like often leak onto the ball rolling surface of the outer ring when the outer ring is assembled, making it difficult to obtain a smooth ball rolling surface and resulting in poor ball rolling performance.

Moreover, if you try to mold the dustproof plate integrally with the outer ring of the bearing, which has a relatively large diameter,
As the mold becomes more complex, the finishing accuracy of the molded product becomes unstable, creating new problems.

(Problems to be Solved by the Invention) The present invention solves the above-mentioned problems in plastic bearings in which the outer ring is assembled and formed, namely (1) poor assembly strength and assembly accuracy; )
The adhesive line impairs the smoothness of the ball rolling surface,
This is intended to solve problems such as deterioration of ball rolling performance, and (3) easy damage to the smoothness of the ball rolling surface due to adhesive leakage. The object of the present invention is to provide a plastic bearing that increases assembly accuracy, improves the rolling properties of the balls, and enables a significant reduction in manufacturing costs.

(Means for Solving the Problems) The present invention comprises an outer ring segment 1 in which a ball raceway surface 2 is formed above the inner circumferential surface of an annular body and an annular stepped portion 1a is formed on the upper surface thereof; An outer ring segment piece 1' having a ball raceway surface 2' above the inner circumferential surface side of an annular body having the same outer diameter as the piece 1, and an annular recessed part 1a' formed on the upper surface side to engage with the annular stepped part 1a. and a plastic outer ring A formed by fitting the annular recess 1a' into the annular step 1a and fixing the opposing surfaces of the two outer ring division pieces 1 and 1'; and a plastic outer ring A having a ball raceway surface 6. a manufactured inner ring B; a ball 8 inserted between the outer ring A and the inner ring B; the outer ring segment 1,
1' or at least one side of the inner ring B, there is provided a dustproof plate 3 that covers the side of the ball 8 formed integrally with the outer ring division pieces 1, 1' and the inner ring B. The annular step 1a is provided with an engagement recess 4 or an engagement protrusion 5, and the annular recess 1a' is provided with an engagement protrusion that engages with the engagement recess 4 or the engagement protrusion 5 of the annular step 1a. 5 or engagement recesses 4 are respectively provided, and a plurality of needle-like protrusions 11 are formed on both or one of the contact surfaces 1b, 1b' of both outer ring division pieces 1, 1' to engage with the engagement recesses 4. A certain distance R between the horizontal plane L' passing through the abutting surfaces 1b and 1b' and the horizontal plane L passing through the center O of the ball raceway surfaces 2 and 2'.
Both outer ring divided pieces 1 are deflected in the vertical direction by
1′, and the plurality of needle-like protrusions 1
The basic structure of the invention is that the two contact surfaces 1b and 1b' are fixed together by ultrasonic melting.

(Function) Due to the engagement between the engagement recess 4 and the engagement protrusion 5 formed in the annular stepped portion 1a and annular recess 1a' of both outer ring segments 1, 1', the circumferential direction between the segments is reduced. Relative movement is locked. As a result, even if there is a difference in stress in the circumferential direction applied to the ball rolling surfaces 2, 2' of the two outer ring segments 1, 1' (in reality, the ball rolling surfaces 2, 2'
2' have different areas, there is a difference in the stress in the circumferential direction that both rolling surfaces 2 and 2° receive), which prevents both outer ring segments 1 and 1' from coming off. There will be none.

Further, due to the fitting between the annular step portion 1a and the annular recess 1b and the engagement between the locking recess 4 and the locking protrusion 5, the assembly accuracy and workability of the two outer ring segments 1, 1' are improved.

Furthermore, the contact surfaces 1b, 1 of both outer ring division pieces 1, 1'
A step R of a certain distance is provided between the horizontal plane L' passing through b' and the horizontal plane L passing through the center O of the ball. The welded joint line is no longer located and the ball rolls on a smooth curved surface. As a result, the rolling performance of the ball is significantly improved compared to the conventional case where the ball rolls directly above the joining line.

In addition, since the needle-like protrusion 11 is ultrasonically melted to weld the two contact surfaces 1b and 1b', the melting energy is concentrated on the needle-like protrusion, ensuring melting, and removing the melted excess. There is no possibility that the resin will leak onto the ball rolling surface.

(Example) Hereinafter, details will be explained based on an example of the present invention shown in FIGS. 1 to 20.

1 to 9 relate to a first embodiment of the present invention, in which FIG. 1 is a plan view of the outer ring segment 1, FIG. 2 is a partially longitudinal front view, and FIG. 3 is an engaging recess. FIG.

The outer ring segment 1 is formed into a substantially ring shape by integrally molding a so-called engine plastic that has excellent heat resistance, corrosion resistance, and wear resistance, such as hard nylon or polyacetate. A spherical ball raceway surface 2 is formed. Further, a dustproof plate 3, which is a thin plate brim-like body, is formed to protrude inward at the lower part of the inner peripheral surface side, and furthermore, an annular stepped portion 1a having a width L and a height H is formed on the upper surface side. In addition, a notch-like engagement recess 4 is provided on the inner surface of the annular stepped portion 1a.

FIG. 4 is a plan view of the other outer ring segment 1' that is assembled to face the outer ring segment 1, FIG. 5 is a partially longitudinal front view thereof, and FIG. 6 shows an engaging protrusion. It is a slope view. The outer ring segment 1' is formed in substantially the same shape as the outer ring segment 1, and the shapes of the ball raceway surface 2' and the dustproof plate 3' are also substantially the same. Only,
As shown in FIGS. 5 and 6, an annular recess 1a' that engages with an annular step 1a formed on the outer ring segment 1 is provided on the upper surface side of the outer ring segment 1'. A locking protrusion 5 that fits into the engagement recess 4 on the divided piece 1 side is formed on the inner surface of the annular recess 1a'. Further, the rolling surface 2' of the outer ring segment 1' is formed to have a larger contact area with the ball than the rolling surface 2 of the outer ring segment 1.

Note that the shapes of the engagement recess 4 and the locking protrusion 5 are not limited to only a quadrangle as in this embodiment, but may be other shapes such as a triangle. or,
It is sufficient that the number of engagement recesses 4 and locking protrusions 5 is at least one, and it is usually desirable to have two to four fitting locations. Further, the same applies to the shapes of the annular stepped portion 1a and the annular recessed portion 1a', and it goes without saying that they may be triangular or other shapes.

Figures 7 and 8 show the inner ring B for the bearing.
1 is a plan view and a longitudinal cross-sectional view of the outer ring, which is integrally formed of engineered plastic made of the same material as the two outer ring division pieces 1 and 1', and has a ball raceway surface 6 and a shaft insertion hole 7, respectively.

FIG. 9 is a cross-sectional view showing the assembled state of the bearing according to the present invention, in which the outer ring A has both outer ring division pieces 1 and 1' disposed facing each other to form an annular stepped portion 1a and an annular recessed portion 1a'. At the same time, the engaging recess 4 and the locking protrusion 5 are engaged with each other. The attachment position is regulated extremely accurately, and the alignment of the ball 8 and the ball raceway surfaces 2, 2' is automatically achieved. Also, dustproof plates 3, 3
As a result, the outside of the ball 8 is covered without any gaps.

As shown in FIG. 9, the outer ring division pieces 1 and 1' are formed by dividing the outer ring A along a plane passing through a point slightly deviated upward and downward from the center of the ball raceway surface. has been done. That is, when both outer ring divided pieces 1, 1' are assembled, a horizontal plane L' passing through their contact surfaces 1b, 1b' is aligned with the center O of the ball raceway surfaces 2, 2 (i.e., the center of the ball). They are each formed so as to be located a distance R below from a horizontal plane L passing through O).

Furthermore, the two outer ring segments 1, 1' are fixed together by melting needle-like protrusions formed on their contact surfaces 1b, 1b' by ultrasonic welding, as will be described later. There is.

Further, in this embodiment, the dustproof plates 3, 3 are provided on both end faces of the outer ring A, but they may be provided only on one side, or as shown in FIG.
Dust-proof plates 3, 3 may be formed on the sides. Generally, it is more convenient to provide the dustproof plate 3 on the outer ring A side for a bearing for fixing the outer ring, and on the inner ring B side for a bearing for fixing the inner ring. Furthermore, although this embodiment shows a bearing with a retainer 9, it goes without saying that a full ball type bearing without the retainer 9 may be used.

11 to 17 relate to the second embodiment of the present invention, in which FIG. 11 is a plan view of the outer ring segment 1, FIG. 12 is a rear view thereof, and FIG. 13 is a partially vertical front view. be. Further, FIG. 14 shows the other outer ring segment 1' to be combined with the outer ring segment 1, FIG. 15 is a rear view thereof, and FIG. 16 is a partially vertical front view thereof.

Each outer ring segment piece 1, 1' in this embodiment is as follows:
It has substantially the same structure as each of the divided pieces 1 and 1' of the first embodiment, except that the formation positions of the engaging recess 4 and the locking protrusion 5 are different, and each divided piece 1 ,1'
The only difference is that a so-called slot 10'' is appropriately provided in the thick part of the outer ring. That is, the circular engagement recess 4 on the side of the outer ring segment 1 is formed on the upper surface of the annular step 1a, and A cylindrical locking protrusion 5 that fits therein is provided on the bottom surface of each annular recess 1a'.
The outer ring segments 1, 1' are assembled by assembling both the recesses 4 and the protrusions 5 in the state shown in the figure.

The shape of the engaging protrusion 5 may be any shape, for example, a conical shape as shown in FIG. 18 or a prismatic shape as shown in FIG. 19. Also, as shown in Figure 20,
The engagement recess 4 is a circular through hole, and the protrusion 5 is
Protrude the tip to the hollow part 10, and both contact surfaces 1
When welding b and 1b', their tips may be welded at the same time.

Furthermore, in the embodiment described above, the engaging recess 4 is separately provided on the divided piece 1, and the locking protrusion 5 is separately provided on the divided piece 1'. It is also possible to mix them in the divided pieces 1 and 1'. Furthermore, as shown in FIG. 18, a plurality of needle-like protrusions 11 are appropriately provided on the upper end of the annular step portion 1a and at least one of the contact surfaces 1b, 1b' of the two divided pieces 1, 1'. There is. By providing the needle-like protrusion 11, it is possible to more smoothly and reliably weld the joint surfaces during ultrasonic welding, and furthermore, it is possible to obtain a clean welded surface without melting of the molten resin.

Since the present invention has the above-described structure, it has many excellent effects as described below.

(1) Since the dust-proof plate 3 is formed integrally with the outer ring or inner ring, there is no need to fit a separately formed dust-proof plate like in conventional bearings, reducing the number of parts and simplifying processing and assembly. can be achieved.

(2) Since the outer ring A is constructed by assembling the two outer ring segments 1 and 1', molding is significantly easier than when the outer ring A is formed integrally, and the ball raceway surface etc. can be finished with high precision.

(3) The annular stepped portions 1a and annular recessed portions 1a' of both outer ring segments 1, 1' are engaged, and the engaging recesses 4 and the locking protrusions 5 are engaged to assemble them. Therefore, the mutual position of the two outer ring segments 1, 1' is regulated by the engagement of the protrusion 5 and the recess 4, which simplifies the assembly work of the outer ring and significantly improves the assembly accuracy.

Furthermore, the engagement between the recess 4 and the protrusion 5 significantly increases the assembly strength between the two, and there is no possibility that the two will come apart due to stress in the circumferential direction during use and that their mutual positions will be misaligned.

(4) By fitting the recess 4 and the protrusion 5, the ball raceway surface of the outer ring A can be automatically aligned, and the inner and outer rings can be aligned automatically.
Since the outer rings A and B themselves are made of plastic, even when steel balls are used, rotating contact noise is completely absorbed, and bearing noise is significantly reduced.
Furthermore, it is highly suitable for mass production, and it is easy to make bearings lighter and have more diverse colors.

(5) A plurality of needle-like protrusions 11 on both or either one of the opposing surfaces 1b, 1b' of the two divided pieces 1, 1'.
, and by ultrasonically welding the needle-like protrusion 11, the two contacting surfaces 1b and 1b' are fixed, so that the welding surface is in an extremely ideal state in terms of strength and finishing accuracy. There is no melting of the resin onto the rolling surfaces 2, 2'.

(6) When assembling both outer ring segments 1 and 1', in cross-sectional view, the body contact surfaces 1b and 1b', that is,
Since the horizontal plane L' passing through the welding surface and the horizontal plane L passing through the center O of the ball are formed so as to create a level difference of a certain distance R in the vertical direction, the ball and the outside during use of the bearing are The welded joint line is no longer located on the contact line with the wheel rolling surface, and the ball rolls on a smooth curved surface. As a result, the rolling performance of the ball is significantly improved compared to the conventional case where the ball rolls directly above the joining line.

As mentioned above, the present invention has extremely high practical utility.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an outer ring segment 1 according to a first embodiment of the present invention, FIG. 2 is a partially longitudinal front view thereof, and FIG. 3 is a perspective view showing an engaging recess. Fourth
The figures are a plan view of the other outer ring segment 1', FIG. 5 is a partially longitudinal front view thereof, and FIG. 6 is a perspective view showing an engaging protrusion. 7 and 8 are a plan view and a partially vertical front view of the inner ring B. FIG. Figure 9 and 1
FIG. 0 is a partial vertical cross-sectional view showing how the bearing is assembled. FIG. 11 is a plan view of an outer ring segment 1 according to another embodiment of the present invention, FIG. 12 is a rear view thereof, and FIG. 13 is a partially longitudinal front view thereof. FIG. 14 is a plan view of the other outer ring segment 1';
FIG. 5 is a rear view thereof, and FIG. 16 is a partially longitudinal front view thereof. FIG. 17 is a longitudinal sectional view showing the assembled state of the outer ring A. 18 and 19 are perspective views showing other embodiments of the engagement protrusion 5, and FIG. 20 is a longitudinal cross-sectional view showing still another fitted state of the protrusion 5 and the recess 4. A... Outer ring, B... Inner ring, 1, 1'... Outer ring segment, 1a... Annular step, 1a'... Annular recess, 1
b, 1b'... opposing surface, 2, 2... ball orbital surface,
3...dustproof plate, 4...engaging recess, 5...locking protrusion, 8...ball, 11...needle-shaped protrusion.

Claims (1)

[Scope of utility model registration request] An annular stepped portion 1a in which a ball raceway surface 2 is formed above the inner peripheral surface of the annular body, and an engaging recess 4 or a locking protrusion 5 is provided on the contact surface 1b on the upper surface of the annular body.
an outer ring segment 1 formed of;
A horizontal plane L' passing through the contact surface 1b is deviated upward or downward by a certain distance R from a horizontal plane L passing through the center O of the ball orbital surface 2, and fixed.
A ball raceway surface 2' is formed above the inner peripheral surface side of the annular body having the same outer diameter as the outer ring segment 1, and a ball raceway surface 2' is formed on the upper surface side of the annular body in the engaging recess 4 or the locking protrusion 5. an outer ring segment 1' formed with an annular recess 1a' that engages with an annular step 1a provided with an engagement protrusion 5 or engagement recess 4;
a plurality of needle-like protrusions 11 formed on at least one of the contact surfaces 1b, 1b' of 1' and melted by ultrasonic welding; an inner ring B made of plastic having a ball raceway surface; the inner ring B and the two outer rings. Split piece 1, 1'
A ball 8 inserted between an outer ring A consisting of a ball 8; A plastic bearing consisting of a dustproof plate 3 that covers the sides of a formed ball 8.