JP5926227B2 - Centering jig - Google Patents

Description

  The present invention relates to a centering jig used for machining a shaft object.

  When processing shafts (general parts such as shafts, gears, pulleys, etc.) by rotating the shaft, grinding, cutting, etc., a centering jig is used to match the center of rotation with the center of the shaft. .

  The centering jig is a jig whose tip side has a conical shape or a truncated cone shape. When a centering jig is inserted into the recessed hole formed in the end surface of the shaft object and the end surface of the shaft object is brought into contact with the inclined surface of the cone shape or the truncated cone shape, Since the end surface of the shaft slides along the inclined surface of the jig and the entire shaft is moved toward the center of rotation, the deviation between the center of rotation and the center of the shaft is eliminated (centering).

Japanese Patent Laid-Open No. 2-116459

  In order to use the centering jig, it is necessary that a recessed hole having a sufficient depth is formed at the end of the shaft object. This is because if the depth of the recessed hole is not sufficient, the tip of the centering jig contacts the bottom of the recessed hole before the inclined surface of the centering jig contacts the end surface of the shaft object, and the inclined surface is used. This is because the centering cannot be performed. On the other hand, if a recessed hole having a sufficient depth is formed at the end of the shaft object, the axial length of the shaft object is increased accordingly, which is not preferable.

  Therefore, it is conceivable to cut the tip of the centering jig so that the tip of the centering jig does not contact the bottom of the concave hole.

  However, since the centering jig whose tip is cut has a large flat surface at the tip, there is a problem that the deviation between the center of rotation and the center of the shaft object becomes small. That is, if the deviation between the center of rotation and the center of the shaft object is large, the gap between the tip of the centering jig and the recessed hole is small, so that the flat surface becomes the end surface of the shaft object when the centering jig is inserted into the recessed hole. The centering cannot be performed.

  The present invention has been made in view of such a technical problem, and an object thereof is to provide a centering jig capable of centering even when a recessed hole formed in an end surface of a shaft object is shallow. To do.

According to an aspect of the present invention, there is provided a centering jig which is inserted into a recessed hole formed in an end surface of a shaft object and performs centering of the shaft object, and includes an opening on the shaft object side and an edge of the opening. A housing having a first inclined surface to be connected, and a conical shape or a truncated cone shape having a second inclined surface are provided on the shaft object side, are slidably accommodated in the housing, and the second through the opening. In the state where the inclined surface is exposed, the first inclined surface and the second inclined surface are continuous , and one inclined surface that contacts the end surface of the shaft object and brings the shaft object to the center line of the centering jig. There is provided a centering jig comprising: a movable portion that forms a surface; and a reaction force generating means that generates a reaction force when a force in a direction of pushing into the housing acts on the movable portion. .

  According to the above aspect, since the movable part is pushed into the housing when the movable part comes into contact with the bottom of the concave hole, the shaft object is centered even when the concave hole formed in the end surface of the shaft object is shallow. Can do. In addition, since it is not necessary to cut the tip of the centering jig according to the depth of the concave hole, the gap between the tip (movable part) of the centering jig and the concave hole can be made large. Even if the deviation between the center axis of the unloading jig and the center axis of the shaft object is large, the movable part can be surely inserted into the recessed hole to center the shaft object.

It is the schematic of the centering jig which concerns on embodiment of this invention, and the shaft thing by which centering is performed by this. It is the figure which showed a mode that centering was performed by the centering jig | tool.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 shows a schematic configuration of a centering jig 1 according to an embodiment of the present invention and a shaft object 2 on which centering is performed. The centering jig 1 includes a housing 11, a movable portion 12, and a spring 13. The shaft object 2 is, for example, a reduction gear used in a transmission, and a concave hole 21 into which the centering jig 1 is inserted is formed in the end surface 22.

  The housing 11 has an opening 11o smaller than the outer diameter of the end surface 22 of the shaft object 2 on the shaft object 2 side, and an inclined surface 11t connected to the edge of the opening 11o. The inclined surface 11t functions as a support surface that finally supports the centered shaft 2 by inserting the centering jig 1 into the recessed hole 21 of the shaft 2. The housing 11 is connected to a hydraulic cylinder (not shown) and can be displaced in the axial direction by the hydraulic cylinder.

  The movable portion 12 has a truncated cone shape having an inclined surface 12 t on the shaft object 2 side, and is slidably accommodated in the housing 11.

  The spring 13 is disposed in a space 14 formed by the housing 11 and the movable portion 12. When the spring 13 is in a free length state, only the frustoconical portion of the movable portion 12 protrudes from the opening 12o so that the inclined surface 12t is exposed from the opening 11o, and the inclined surface 12t and the inclined surface 11t of the housing 11 are continuous. One inclined surface is formed.

  FIG. 2 shows how the shaft 2 is centered by the centering jig 1.

  FIG. 2A shows an initial state, and the center axis O2 of the shaft object 2 is deviated from the center axis O1 of the centering jig 1, that is, the rotation center at the time of processing.

  When the centering jig 1 is moved closer to the shaft object 2 by the hydraulic cylinder from the state of FIG. 2A, the end surface 22 of the shaft object 2 comes into contact with the inclined surface 12t of the movable portion 12 (FIG. 2B). Since the movement of the shaft object 2 in the direction orthogonal to the central axis O2 is not restricted, when the end surface 22 of the shaft object 2 contacts the inclined surface 12t of the movable part 12, the end surface 22 of the shaft object 2 is on the inclined surface 12t of the movable part 12. And the shaft 2 is brought close to the center axis O1 of the centering jig 1 (FIG. 2C).

  At this time, the force in the direction of pushing the movable part 12 into the housing 11 acts on the movable part 12 from the shaft object 2, but the shaft object 2 is displaced in a direction perpendicular to the central axis O <b> 2 and the shaft object 2, the movable part 12, Since the force acting during this period is released, the force is sufficiently small, and the movable portion 12 is not pushed into the housing 11 against the reaction force of the spring 13.

  When the centering jig 1 is further displaced toward the shaft object 2, the end surface 22 of the shaft object 2 is transferred to the inclined surface 11 t of the housing 11, and when the tip of the movable part 12 contacts the bottom 21 b of the concave hole 21, the movable part 12 is pushed into the housing 11 against the reaction force of the spring 13.

  The end surface 22 of the shaft object 2 transferred to the inclined surface 11t of the housing 11 further slides on the inclined surface 11t of the housing 11, and thereby the deviation between the center axis O1 of the centering jig 1 and the center axis O2 of the shaft object 2 is achieved. Is completely resolved. Finally, the inclined surface 11t of the housing 11 is pressed against the end surface 22 of the shaft object 2, and the shaft object 2 is supported by the inclined surface 11t of the housing 11 (FIG. 2D).

  Therefore, according to the centering jig 1, since the movable part 12 is pushed into the housing 11 when the movable part 12 comes into contact with the bottom 21b of the concave hole 21, the concave hole 21 formed in the end surface 22 of the shaft object 2 is formed. Even in a shallow case, the shaft 2 can be centered (effect corresponding to claims 1 and 2). Accordingly, even when a plurality of types of shafts having different depths of the concave holes 21 are flowed on the same line, it is not necessary to replace the centering jig 1 and the operating rate of the apparatus can be improved.

  Further, since it is not necessary to cut the tip of the centering jig 1 in accordance with the depth of the concave hole 21, a large gap is provided between the tip of the centering jig 1 (movable portion 12) and the concave hole 21. Even if the deviation between the center axis O1 of the centering jig 1 and the center axis O2 of the shaft object 2 is large, the movable part 12 can be surely inserted into the concave hole 21 and the shaft object 2 can be centered. (Effects corresponding to claims 1 and 2).

  The embodiment of the present invention has been described above, but the above embodiment is merely one example of application of the present invention, and the technical scope of the present invention is limited to the specific configuration of the above embodiment. is not.

  For example, although the shape of the movable part 12 on the shaft object 2 side is a truncated cone shape, it may be a cone shape.

  Moreover, in the said embodiment, although the reaction force when the movable part 12 is pushed in in the housing 11 is generated with the spring 13, you may make it generate | occur | produce with other means, such as hydraulic pressure and air pressure.

1 Centering jig 11 Housing 11t Inclined surface (first inclined surface)
11o opening 12 movable part 12t inclined surface (second inclined surface)
13 Spring (Reaction force generation means)
2 shaft object 21 recessed hole 22 end face

Claims (2)

A centering jig for centering the shaft object by being inserted into a recessed hole formed on an end surface of the shaft object,
A housing having an opening on the shaft object side and a first inclined surface connected to an edge of the opening;
A conical shape or a truncated cone shape having a second inclined surface is provided on the shaft object side, is slidably accommodated in the housing, and the first inclined surface is exposed in the state where the second inclined surface is exposed from the opening. An inclined surface and the second inclined surface are continuous , and a movable portion that forms one inclined surface that contacts the end surface of the shaft object and brings the shaft object to the center line of the centering jig ,
Reaction force generating means for generating a reaction force when a force in a direction of pushing into the housing acts on the movable part;
A centering jig characterized by comprising: The centering jig according to claim 1,
The reaction force generating means is a spring disposed in a space between the housing and the movable part.
A centering jig characterized by that.

Images