JP4419649B2 - Self-aligning bearing assembly - Google Patents

Description

The present invention is suitable for being applied to, for example, a large and heavy shaft that slidably supports a mold or the like of an injection molding apparatus, and has a simple and inexpensive structure with a shaft of a shaft portion to be supported. The present invention relates to a self-aligning bearing assembly having a centering action that allows relative movement in a direction and can absorb displacement of a coaxial portion.

  Conventionally, resin products used as, for example, automobile parts are manufactured using an injection molding apparatus or the like. In the injection molding machine, the upper and lower molds of the mold slide on the shaft, or the shaft side slides, and while the mold is opened and closed, resin product molding and product discharge from the mold are repeated. However, in this case, an oil-less bush is generally incorporated in the sliding surface of the mold relative to the shaft, or the sliding surface of the workpiece that slides on the shaft. Ensures slidability in the vertical direction. The oil-less bush is made of a Cu alloy and has graphite embedded in the vicinity of the sliding surface, reducing the frictional resistance between the shaft and the workpiece and being excellent in seizure resistance.

However, since the work and the mounting plate to which the shaft is attached are separately machined and then assembled, various operation failures may occur due to errors in machining accuracy between the two parts.
For example, the shaft and the work piece have poor concentricity due to a machining error, or the shaft and the work have a perpendicularity defect due to a machining error.

In order to solve the above problems, in Patent Document 1 (Japanese Utility Model Publication No. 2-26772), a support bush made of an oil-impregnated sintered metal material is provided as a bearing for supporting a steering shaft of an automobile, and its outer periphery. A bearing structure is disclosed that has an elastic coating layer on the part and that locks and supports the shaft in a state in which the shaft can swing in the longitudinal direction by a protrusion that is punched inward from the outside of the body corresponding to the central part in the longitudinal direction. ing.
Patent Document 2 (Japanese Utility Model Publication No. 5-15617) discloses a bearing structure that supports a rod such as an actuator that moves in and out of a casing such as an actuator, and is attached to a bearing and a casing arranged around the rod. There is disclosed a bearing structure that absorbs the deflection of the rod by interposing an elastic body with the retainer.

Japanese Utility Model Publication No. 2-26772 Japanese Utility Model Publication No. 5-15617

  However, the bearing structures disclosed in Patent Documents 1 and 2 are both applicable to small and light shafts, and are large and heavy shafts that slidably support a mold of an injection molding apparatus. However, there is a problem that it is not durable and cannot be applied.

In view of the problems of the prior art, the present invention is applicable to a large and heavy shaft that slidably supports a mold or the like of an injection molding apparatus, and a relative motion in the axial direction of a shaft portion to be supported. An object of the present invention is to provide a self-aligning bearing assembly having a centering action capable of absorbing the displacement of the coaxial portion and absorbing the displacement of the coaxial portion.

The present invention achieves such an object. In the self-aligning bearing assembly of the present invention, a shaft portion to be supported on the inner periphery can be inserted, and relative axial movement of the coaxial portion is performed with respect to the coaxial portion. a bush rotatably supported, is disposed on the outer periphery of both end portions of the bushing, an annular cushion capable of absorbing the displacement of the coaxial portion with respect to the shaft portion, the ring-shaped cushioning member is divided into two upper and lower ring-shaped cushioning member from it, a gap formed over the circumferential direction between the annular cushion of the both ends, and a flange portion provided for locking the bush on the end of each of the ring-shaped cushioning member, A casing for housing the bush and the annular buffer, and an annular flange corresponding to the flange for holding the annular buffer and the bush are integrally provided in the casing, and the casing, the bush and the bush An annular shock absorber is assembled together Characterized in that was.

Self-aligning bearing assembly of the present invention, the bush surrounding the outer periphery of the shaft portion to be supported, and the ring-shaped cushioning member disposed on the outer periphery, it accommodates them in the casing, and these are a Trinity Therefore, assembly is easy.
Moreover, in addition to the said structure, this invention can increase the displacement absorption performance of an annular buffer as mentioned above by providing a space | gap part in a part of said annular buffer. In addition, by providing a flange for holding the bush on the annular buffer, the integrity of the bush and the annular buffer can be increased.
Further, according to the present invention , by providing a flange for holding the annular buffer and the bush in the casing, the integrity of the casing, the bush and the annular buffer can be enhanced, thereby Assembly is further facilitated.
That is, if the assembly is manufactured in advance and inserted into a bearing portion of a shaft intended for the assembly, the assembly is easy.

As described above, according to the present invention, since the displacement absorption of the shaft portion is increased with a simple and inexpensive structure, a coaxiality defect or a perpendicularity defect is caused between the shaft side and the bearing side due to an error in processing accuracy. Even if this occurs, these defects can be absorbed and restored to normal support.
Further, if the self-aligning assembly of the present invention is manufactured in advance and inserted into the target bearing portion, the assembly is extremely simple.

Further, by providing a gap in a part of the annular buffer, the gap becomes a part receiving space for the annular buffer for absorbing the displacement of the shaft part, and the displacement absorption performance is increased. Alternatively, preferably, by providing a flange for holding the bush in the annular buffer, the unity between the bush and the annular buffer can be increased, and further, the annular buffer and the bush are provided in the casing. By providing the flange portion for holding the casing, the integrity of the casing, the bush and the annular buffer can be enhanced, and the assembly or handling of the bearing portion is facilitated.

Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the component parts described in this example are not intended to limit the scope of the present invention only to specific examples unless otherwise specified. Only.
FIG. 1 is a vertical sectional elevation view according to a first embodiment in which the present invention is applied to the production of a resin product by an injection molding apparatus, FIG. 2 is a partially enlarged sectional view of the bearing structure according to the first embodiment, and FIG. It is a partially expanded sectional view of the bearing structure which concerns on 2nd Example of this invention.

  In FIG. 1 which shows the whole structure of the injection molding apparatus in the first embodiment, reference numerals 1 and 2 slide on the support shafts 5a and 5b, and close to each other to confine the molten resin in a cavity formed inside. An upper mold and a lower mold that are molded and then operated to be separated from each other and take out the molded resin product. 3 and 4 hold the upper mold 1 and the lower mold 2 from above and below. Reference numerals 6 and 6 denote an upper fixing plate and a lower fixing plate that support the molten resin injection port formed in the upper mold 1 and the upper fixing plate 3, respectively. Conventional oilless bushes 7 a and 7 b are arranged on the sliding surfaces between the support shafts 5 a and 5 b and the upper mold 1 and the lower mold 3.

  Reference numeral 8 denotes an inclined pin having a slide core 9 attached to the tip. The lower end of the inclined pin 8 is fixed to a support plate 11 that slides on the support shaft 12 and slides up and down together with the upper and lower molds 1 and 2. Reference numeral 10 denotes a conventional oilless bush disposed on the sliding surface between the lower fixed platen 4 and the inclined pin 8, and reference numeral 14 denotes a lower floor structure that supports the injection molding apparatus main body, the support shaft 12, and the like. . Reference numeral 13 denotes a self-aligning bearing according to the present invention disposed between the support shaft 12 and the support plate 11. Four support shafts 12 are erected to support the injection molding apparatus main body from below.

  In the apparatus of the first embodiment, in the state where the upper and lower molds 1 and 2 are opened from each other, the molten resin m is injected through the injection port 6 into the gap formed in the upper and lower molds 1 and 2, Thereafter, the upper and lower molds 1 and 2 are opened to each other, and the molded resin product is taken out. At that time, the slide core 9 forms a cavity together with the upper and lower molds 1 and 2 and normally slides together with the upper and lower molds 1 and 2. Since 9 becomes an obstacle, the inclined pin 8 moves up on the support shaft 12, and the slide core 9 moves in the direction of the arrow and leaves the resin product. Thereby, the resin product can be taken out from the molds 1 and 2.

  Next, the self-aligning bearing (assembly) according to the first embodiment of the present invention will be described with reference to FIG. 2 is an enlarged longitudinal sectional view of the self-aligning bearing (assembly) 13 of FIG. 1. In FIG. 2, 20 is a conventional oilless bush provided on the outer periphery of the support shaft 12, and 21a and 21b are The upper and lower annular shock absorbers are divided into two and arranged on the outer periphery of the oilless bush 20 and have a gap 21c therebetween. Further, the upper and lower annular buffer bodies 21a and 21b have annular flanges 22a and 22b protruding inside to hold the oilless bush 20, respectively. Reference numeral 23 denotes a casing for housing the oilless bush 20 and the annular buffer bodies 21a and 21b. The casing 23 is a ring projecting inward to hold the oilless bush 20 and the annular buffer bodies 21a and 21b up and down. The collar parts 23a and 23b are provided.

  In the bearing structure of the first embodiment, the self-aligning bearing (assembly) 13 slides relative to the support shaft 12 in the axial direction, and the annular cushions 21a and 21b are made of urethane, for example. It is made of an elastic body such as rubber or nylon rubber, and effectively absorbs a coaxiality defect or a perpendicularity defect based on a subtle processing error between the support shaft 12 and the support plate 11. The annular buffer body 21 is not limited to an elastic body, and may be, for example, a flexible body. In short, the annular buffer body 21 has a direction perpendicular to the axial direction of the support shaft 12 or an oblique direction of the support shaft 12. Any material that can absorb the displacement may be used.

Further, in the bearing structure of the first embodiment, since the gap 21c is provided between the annular buffers 21a and 21b over the entire circumference in the circumferential direction, combined with the original elastic force of the annular buffer, Operational troubles such as so-called twisting between the support shaft 12 and the oilless bush 20 are eliminated.
Also, in terms of machining accuracy, only the machining accuracy between the support shaft 12 and the oilless bush 20 needs to be managed, and therefore manufacturing becomes extremely easy.
Furthermore, since both the annular cushions 21a, 21b and the casing 23 have the flanges 22a, 22b, 23a, 23b, the bushing 20 and the like are firmly integrated, and the handling is convenient. Assembly is extremely easy.

Next, a second embodiment of the present invention will be described with reference to FIG. The difference between the first embodiment and the second embodiment is that the oilless bush 20 is arranged on the outer peripheral side of the support shaft 12 in the first embodiment, whereas the oil-filled bush is in the second embodiment. Therefore, an oil supply groove 12a is provided on the surface of the support shaft 12, and oil is supplied through the oil supply groove 12a. The oil supply groove 12 a may be provided on the bush 30 side surface that contacts the outer surface of the support shaft 12.
The first embodiment and the second embodiment have the same structure other than those described above, and therefore the operations and effects achieved by the same structure other than the above structure are also the same.

  According to the present invention, for example, it is suitable to be applied to a large and heavy shaft that slidably supports a mold or the like of an injection molding apparatus, and has a simple and inexpensive structure and is easy to assemble. In addition, it is possible to provide an automatic centering bearing having a centering action that allows relative movement in the axial direction of the shaft part to be supported and that can absorb the displacement of the coaxial part, and a bearing assembly thereof.

It is a vertical section elevation view concerning the 1st example which applied the present invention to manufacture of a resin product with an injection molding device. It is a partial expanded sectional view of the bearing structure which concerns on the said 1st Example. It is a partially expanded sectional view of the bearing structure which concerns on 2nd Example of this invention.

DESCRIPTION OF SYMBOLS 1 Upper mold 2 Lower mold 3 Upper fixed board 4 Lower fixed board 6 Inlet 8 Inclination pin 9 Slide core 11 Support board 12 Support shaft 12a Oil supply groove 13 Self-aligning bearing 20 Oilless bush 21a Upper annular buffer 21b Lower Annular shock absorber 21c Cavity 22a, 22b collar 23 casing 23a, 23b collar

Claims (1)

A bush that is insertable into the inner periphery and that supports the axial movement of the coaxial portion relative to the coaxial portion;
An annular buffer disposed on the outer periphery of both ends of the bush and capable of absorbing the displacement of the coaxial part relative to the coaxial part;
The annular buffer is composed of an upper and lower annular buffer divided into two, and a gap formed between the annular buffers at both ends in the circumferential direction;
A hook provided to lock the bush at the end of each annular buffer;
A casing for housing the bush and the annular buffer;
An annular flange corresponding to the flange for holding the annular buffer and the bush is integrally provided in the casing,
The self-aligning bearing assembly, wherein the casing, the bush and the annular buffer are assembled together .

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