JP2018051642A - Stopper and fixing structure of stopper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stopper capable of restraining damaging of the periphery of a spot facing for a bolt.SOLUTION: A stopper 10 for mechanically regulating relative rotation of two predetermined members by abutting on an abutting part 31 provided in the other by being fixed by a bolt 24 to one of the relatively rotating the two predetermined members, comprises a body 11 for forming an insertion hole for inserting the bolt, and a spot facing 13 is formed around the insertion hole in a predetermined surface 11a being one surface of surfaces of the body 11 for opening the insertion hole, and the body is formed with a notch part 14 of notching the body up to an end 11c of the body from a part of the spot facing, in one of directions crossing a direction for abutting on the abutting part.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a stopper that mechanically restricts relative rotation of two members.

  Conventionally, in this type of stopper, there is one in which a stopper is fixed to a member with a bolt (see Patent Document 1). In the thing of patent document 1, the counterbore is formed in the circumference | surroundings of a bolt insertion hole in the surface side of a stopper so that the head of a bolt may not protrude from the surface of a stopper.

JP 2007-50499 A

  By the way, in the thing of patent document 1, the thin part thinner than other parts is formed in the stopper around the countersink. For this reason, when the relative rotation of the two members is mechanically restricted by the stopper, if the counterpart contact portion collides with the stopper, the thin portion may be damaged.

  The present invention has been made in order to solve these problems, and it is an object of the present invention to provide a stopper that can prevent the periphery of a bolt countersink from being damaged.

The first means for solving the above problems is as follows.
A stopper that mechanically restricts the relative rotation of the two predetermined members by being fixed to one of the two predetermined members that rotate relative to each other with a bolt and abutting with a contact portion provided on the other,
A main body having an insertion hole through which the bolt is inserted;
In a predetermined surface that is one of the surfaces of the main body where the insertion hole opens, a countersink is formed around the insertion hole, and the direction intersects the direction in which the contact portion contacts the main body. On the other hand, a notch is formed by cutting out the main body from a part of the counterbore to the end of the main body.

  According to the said structure, the stopper is being fixed with the volt | bolt to one of the two predetermined members which rotate relatively. Then, the contact portion provided on the other of the two predetermined members and the stopper contact each other, so that the relative rotation of the two predetermined members is mechanically restricted.

  The stopper includes a main body, and an insertion hole through which the bolt is inserted is formed in the main body. A countersink is formed around the insertion hole on a predetermined surface which is one of the surfaces of the main body through which the insertion hole opens. For this reason, at least a part of the head of the bolt that fixes the stopper to the predetermined member can be stored in the counterbore.

  Here, on the predetermined surface, a cutout portion in which the main body is cut out from a part of the counterbore to the end of the main body is formed in one of the directions intersecting the direction in which the contact portion comes into contact with the main body. For this reason, the thin part is not formed in the notch part around the counterbore. Therefore, it is possible to prevent the thin-walled portion from being damaged at the cutout portion of the main body.

  Generally, a thin portion is formed in the other of the crossing directions around the counterbore. And the intensity | strength of the notch part of a main body is falling rather than the intensity | strength of a thin part. For this reason, when a contact part collides with a main body, a main body deform | transforms so that the width | variety of the notch part of a main body may become narrow, and it can suppress that an excessive compressive force acts on a thin part. Therefore, in the stopper, it is possible to suppress damage around the counterbore for the bolt.

  In the second means, a meat portion is formed in a portion adjacent to the notch portion in the peripheral portion of the insertion hole of the main body.

  When forming a notch around the counterbore, if the surrounding part of the insertion hole is also cut out, the strength of that part will decrease excessively, and the body will deform excessively when the abutment collides with the body. There is a risk. In that case, an excessive force acts on the bolt from the main body, and the bolt or the main body may be damaged.

  In this regard, according to the above configuration, the meat portion is formed in a portion adjacent to the notch portion of the main body in the peripheral portion of the insertion hole of the main body. For this reason, it can suppress that the intensity | strength of the main body of a notch part periphery falls too much, and can suppress that a volt | bolt and a main body are damaged.

  In the third means, in the counterbore, the outer edge of the portion opposite to the notch is formed in a semicircular shape.

  When the notch portion is formed around the countersink and the main body is notched too much, the area of the part close to the bolt head in the countersink may be reduced. In that case, when the contact portion collides with the main body, the stress acting on the head portion of the bolt and the countersink becomes high, and the bolt and the main body may be damaged.

  In this regard, according to the above configuration, the outer edge of the portion opposite to the notch portion is formed in a semicircular shape in the counterbore. Therefore, it is possible to increase the area of the portion close to the head of the bolt in the counterbore, and to prevent the bolt and the main body from being damaged. Furthermore, since the notch part of a main body is formed and the outer edge of a countersink is formed in semicircle shape, these processes can be performed easily.

  In the fourth means, the length of the main body in the direction in which the abutting portion comes into contact with the main body is longer than the length of the main body in the intersecting direction.

  According to the above configuration, the length of the main body in the direction in which the contact portion abuts on the main body is longer than the length of the main body in the direction intersecting the direction in which the contact portion abuts on the main body. For this reason, in a main body, a thin part is easy to be formed in the crossing direction around a countersink. In this respect, in such a stopper, it is possible to suppress damage around the bolt counterbore.

  In the fifth means, in the direction in which the abutment portion abuts on the main body, the main body has a recess or a penetration portion on the side where the length to the end of the main body is long with respect to the insertion hole. .

  If the length from the insertion hole to the end of the main body is too long in the direction in which the contact portion comes into contact with the main body, the strength of the portion increases. In that case, if the abutting portion collides with the longer side from the insertion hole in the direction in which the abutting portion abuts on the main body, the abutting portion or a member that fixes the abutting portion may be damaged.

  In this regard, according to the above configuration, in the direction in which the abutting portion comes into contact with the main body, the main body is formed with a concave portion or a penetrating portion on the side where the length to the end of the main body is longer than the insertion hole. For this reason, in the direction in which the contact portion comes into contact with the main body, the strength on the side having a longer length from the insertion hole can be reduced by the recessed portion or the through portion. Therefore, it is possible to prevent the contact portion and the member that fixes the contact portion from being damaged.

The sixth means is
The stopper according to any one of claims 1 to 5,
The bolt,
The bolt has a stopper fixing structure in which a front end surface of the head of the bolt is positioned outside the predetermined surface of the main body.

  There is a case where the head portion of the bolt is completely stored in the countersink, and the front end surface of the head portion of the bolt does not reach the predetermined surface of the main body. In this case, when the contact portion collides with the main body, the deformed main body rides on the head of the bolt, and the stopper may be damaged.

  In this regard, according to the above configuration, the front end surface of the head of the bolt is located outside the predetermined surface of the main body. For this reason, when a contact part collides with a main body, it can suppress that the deformed main body rides on the head of a bolt, and can suppress that a stopper is damaged.

The front view of a stopper. The side view of a stopper. The front view which shows the fixing structure of a stopper. The front view which shows the example of a change of a stopper. The front view which shows the other example of a change of a stopper. The front view which shows the other example of a change of a stopper.

  Hereinafter, an embodiment embodied in a stopper that mechanically restricts rotation of a robot arm within a predetermined angle range will be described with reference to the drawings. The stopper is fixed to one of two arms (two predetermined members that rotate relative to each other) connected by a joint with a bolt, and comes into contact with a contact portion provided on the other, so that the rotation of one arm (two The relative rotation of the arm is mechanically restricted.

  As shown in FIGS. 1 and 2, the stopper 10 is made of stainless steel and includes a main body 11 and a protruding portion 18. The main body 11 is formed in an arc plate shape. The projecting portion 18 is formed in a disc shape at a position deviated from the center of the main body 11 in the circumferential direction (longitudinal direction) of the main body 11. The circumferential direction of the main body 11 corresponds to the direction in which the abutting portion comes into contact with the main body 11 of the stopper 10.

  The main body 11 is formed with an insertion hole 12 through which a bolt is inserted. The insertion hole 12 is formed at a position deviated from the center of the main body 11 to the side opposite to the protruding portion 18 in the circumferential direction of the main body 11. The insertion hole 12 is formed at the center of the main body 11 in the radial direction (width direction) of the main body 11. The cross-sectional shape of the insertion hole 12 is circular. The insertion hole 12 opens to the upper surface 11a (corresponding to a predetermined surface) and the lower surface 11b of the main body 11.

  A counterbore 13 is formed around the insertion hole 12 on the upper surface 11a. The counterbore 13 is formed as a cylindrical recess concentric with the insertion hole 12. The depth of the counterbore 13 is the same as the thickness of the head of the bolt inserted through the insertion hole 12. That is, in a state where the stopper 10 is fixed to one arm (including a member fixed to the arm) with a bolt, the front end surface of the bolt head and the upper surface 11a are flush with each other. A thin portion 16 is formed around the counterbore 13 in the outer diameter direction of the main body 11 (corresponding to a direction intersecting the circumferential direction).

  In the inner diameter direction of the main body 11 (corresponding to a direction intersecting the circumferential direction), a cutout portion 14 is formed in which the main body 11 is cut from a part of the counterbore 13 to an end 11c of the main body 11. The width of the notch 14 is equal to the inner diameter of the counterbore 13. The notch 14 is formed only in the range of the depth of the counterbore 14. That is, the lower part of the notch part 14 is not notched in the main body 11. In the peripheral portion of the insertion hole 12 of the main body 11, a meat portion 15 is formed in the lower portion of the cutout portion 14 (portion adjacent to the cutout portion 14 in the direction perpendicular to the upper surface 11 a). In the counterbore 13, the outer edge of the portion 13a opposite to the notch 14 is formed in a semicircular shape.

  In the circumferential direction of the main body 11, a concave portion 17 is formed in the main body 11 on the side where the length to the end of the main body 11 is longer than the insertion hole 12. The concave portion 17 is formed at a position biased from the center of the main body 11 to the same side as the protruding portion 18 in the circumferential direction of the main body 11. The cross-sectional shape of the recess 17 is circular. The inner diameter of the recess 17 is larger than the inner diameter of the insertion hole 12 and smaller than the inner diameter of the counterbore 13. The recess 17 is formed up to the vicinity of the lower surface 11 b of the main body 11. The recess 17 is formed at the center of the main body 11 in the radial direction of the main body 11. By forming the concave portion 17 in the main body 11, the strength of the portion on the insertion hole 12 side from the center in the circumferential direction of the main body 11 is equal to the strength of the portion on the concave portion 17 side.

  FIG. 3 is a front view showing a fixing structure of the stopper 10. The stopper 10 is fixed by a bolt 24 to an annular member 21 constituting a bearing fixed to the nth arm. Specifically, the stopper 10 is fixed to the end surface of the annular member 21 in the axial direction. The inner diameter of the annular member 21 and the inner diameter of the stopper 10 are substantially equal, and the outer diameter of the annular member 21 and the outer diameter of the stopper 10 are substantially equal. The contact member 31 is fixed to the (n + 1) th arm with a bolt or the like.

  As shown in the figure, the contact member 31 (corresponding to the contact portion) contacts the stopper 10 when the rotation of the (n + 1) th arm is restricted. Here, when the rotation speed of the (n + 1) th arm is high and the contact member 31 collides violently with the stopper 10, the thin portion around the counterbore 13 of the stopper 10 may be damaged.

  Hereinafter, the effect of the stopper 10 of this embodiment is demonstrated. On the upper surface 11 a of the main body 11, a cutout portion 14 is formed in which the main body 11 is cut out from a part of the counterbore 13 to the end 11 c of the main body 11 in the inner diameter direction of the main body 11. For this reason, the thin part is not formed in the part of the notch part 14 around the counterbore 13 in the first place. Therefore, in the notch part 14 of the main body 11, it can prevent that a thin part is damaged.

  A thin portion 16 is formed in the outer diameter direction of the main body 11 around the counterbore 13. However, the strength of the cutout portion 14 of the main body 11 is lower than the strength of the thin portion 16. For this reason, when the contact member 31 collides with the main body 11, the main body 11 is deformed so that the width of the notch portion 14 of the main body 11 becomes narrow, and an excessive compressive force is prevented from acting on the thin portion 16. be able to. Accordingly, the stopper 10 can be prevented from being damaged around the bolt counterbore 13. On the other hand, when the thin part is formed also in the part of the notch part 14 around the counterbore 13, the whole main body 11 becomes difficult to deform | transform so that the width | variety of the notch part 14 may become narrow. For this reason, for example, when the thickness of both thin parts is formed equally, both thin parts may be compressed uniformly and there is a possibility that the thin parts may burst and scatter. For example, when one thin part is thinner than the other thin part, the thinner thin part is intensively compressed, and the thinner thin part is easily broken and scattered.

  When the notch portion 14 is formed around the counterbore 13 and the peripheral portion of the insertion hole 12 is also cut out, the strength of the portion decreases, and the main body 11 when the contact member 31 collides with the main body 11. May be excessively deformed. In that case, an excessive force is applied from the main body 11 to the bolt 24, and the bolt 24 and the main body 11 may be damaged.

  In this regard, in the present embodiment, a meat portion 15 is formed in a portion adjacent to the notch portion 14 of the main body 11 in a direction perpendicular to the upper surface 11 a in the peripheral portion of the insertion hole 12 of the main body 11. For this reason, it can suppress that the intensity | strength of the main body 11 around the notch part 14 falls excessively, and can suppress that the volt | bolt 24 and the main body 11 are damaged. Specifically, the entire main body 11 can be prevented from being excessively deformed or broken. For this reason, it can suppress that a broken piece etc. arise from the main body 11. FIG.

  When the notch 14 is formed around the counterbore 13 and the main body 11 is cut too much, the area of the counterbore 13 near the head of the bolt 24 may be reduced. In that case, when the contact member 31 collides with the main body 11, the stress acting on the head of the bolt 24 and the counterbore 13 becomes high, and the bolt 24 and the main body 11 may be damaged.

  In this respect, in the present embodiment, the outer edge of the portion of the counterbore 13 opposite to the notch 14 is formed in a semicircular shape. Therefore, the area of the portion close to the head of the bolt 24 in the counterbore 13 can be increased, and damage to the bolt 24 and the main body 11 can be suppressed. Furthermore, the process which forms the notch part 14 in the main body 11 and forms the outer edge of the counterbore 13 in semicircle shape can be performed comparatively easily.

  If the length from the insertion hole 12 to the end of the main body 11 is too long in the direction in which the contact member 31 comes into contact with the main body 11, the strength of that portion increases. In this case, as shown on the right side of the figure, when the contact member 31 collides counterclockwise with the main body 11, the contact member 31 or the member that fixes the contact member 31 may be damaged.

  In this respect, in the present embodiment, in the direction in which the contact member 31 comes into contact with the main body 11, the main body 11 is formed with the concave portion 17 on the side where the length to the end of the main body 11 is longer than the insertion hole 12. . For this reason, in the direction in which the contact member 31 comes into contact with the main body 11, the strength on the side having a longer length from the insertion hole 12 can be reduced by the recess 17. Therefore, it is possible to prevent the contact member 31 and the member that fixes the contact member 31 from being damaged.

  The head of the bolt 24 is completely stored in the counterbore 13, and the tip surface of the head of the bolt 24 may not reach the upper surface 11 a of the main body 11. In this case, when the contact member 31 collides with the main body 11, the deformed main body 11 rides on the head of the bolt 24 and the stopper 10 may be damaged.

  In this regard, in the present embodiment, the front end surface of the head of the bolt 24 is flush with the upper surface 11 a of the main body 11. For this reason, when the contact member 31 collides with the main body 11, the deformed main body 11 can be prevented from riding on the head of the bolt 24, and the stopper 10 can be prevented from being damaged.

  In addition, the said embodiment can also be changed and implemented as follows. About the same structure as the said embodiment, description is abbreviate | omitted by attaching | subjecting the same code | symbol.

  The tip surface of the head of the bolt 24 may be positioned above (outside) the upper surface 11 a of the main body 11. Even with such a configuration, when the contact member 31 collides with the main body 11, the deformed main body 11 can be prevented from riding on the head of the bolt 24. Further, a configuration in which the front end surface of the head of the bolt 24 is located below (inside) the upper surface 11a of the main body 11 can also be adopted.

  -The protrusion part 18 of the stopper 10 can also be abbreviate | omitted.

  The insertion hole 12 may be formed in the center of the main body 11 in the circumferential direction of the main body 11. In this case, the recess 17 can be omitted.

  A plurality of insertion holes 12 may be formed in the main body 11 of the stopper 10. In that case, the counterbore 13, the cutout portion 14, and the meat portion 15 may be formed around each insertion hole 12.

  In the inner diameter direction of the main body 11 (corresponding to a direction intersecting the circumferential direction), a cutout portion in which the main body 11 is cut out from a part of the recess 17 to the end 11c of the main body 11 may be formed. Further, instead of the concave portion 17, a through hole (through portion) may be formed.

  The shape of the main body 11 is not limited to the circular arc plate shape, and a shape that matches the shape of the member to which the stopper 10 is fixed can be employed. For example, a rectangular plate shape, a square plate shape, or the like can be adopted.

  As shown in FIG. 4, a configuration in which the width of the notch 114 is narrower than the inner diameter of the counterbore 13 can be adopted. According to such a configuration, the area of the portion near the head of the bolt 24 in the counterbore 13 can be further increased, and damage to the bolt 24 and the main body 11 can be effectively suppressed.

  As shown in FIG. 5, a configuration in which the width of the notch 214 is wider than the inner diameter of the counterbore 13 can be adopted. According to such a configuration, the strength of the main body 11 can be reduced toward the inner diameter side, and the impact when the contact member 31 collides with the main body 11 can be absorbed by gradually deforming the main body 11.

  -As shown in FIG. 6, the structure which formed the notch part 115 in the position of the said flesh part 15 of the main body 11 is also employable.

  In the embodiment described above, the cutout portion 14 in which the main body 11 is cut out from a part of the counterbore 13 to the end 11 c of the main body 11 is formed on the upper surface 11 a of the main body 11 in the inner diameter direction of the main body 11. On the other hand, in the upper surface 11a of the main body 11, the main body 11 is cut out from the part of the counterbore 13 to the end of the main body 11 in the outer diameter direction of the main body 11 (corresponding to the direction intersecting the circumferential direction). A part may be formed.

  -The material of the stopper 10 is not limited to stainless steel, and an aluminum alloy, other metal, resin, or the like can also be employed.

  As the contact portion that contacts the main body 11 of the stopper 10, not only the contact member 31 but also a bolt or a part of the (n + 1) th arm (predetermined member) may be employed.

  -It is not limited to the stopper 10 that mechanically restricts the rotation of the robot arm within a predetermined angle range, but may be embodied in a stopper or the like that mechanically restricts the movement of the movable part of the machine tool within a predetermined length range. it can.

  DESCRIPTION OF SYMBOLS 10 ... Stopper, 11 ... Main body, 11a ... Upper surface (predetermined surface), 11c ... End, 12 ... Insertion hole, 14 ... Notch part, 15 ... Meat part, 16 ... Thin part, 17 ... Recessed part, 24 ... Bolt, 31 ... Contact member (contact portion), 114... Notch, 214.

Claims (6)

A stopper that mechanically restricts the relative rotation of the two predetermined members by being fixed to one of the two predetermined members that rotate relative to each other with a bolt and abutting with a contact portion provided on the other,
A main body having an insertion hole through which the bolt is inserted;
In a predetermined surface that is one of the surfaces of the main body where the insertion hole opens, a countersink is formed around the insertion hole, and the direction intersects the direction in which the contact portion contacts the main body. On the other hand, a stopper in which a cutout portion is formed by cutting off the main body from a part of the counterbore to the end of the main body.   2. The stopper according to claim 1, wherein a meat portion is formed in a portion adjacent to the notch portion in a direction perpendicular to the predetermined surface in a peripheral portion of the insertion hole of the main body.   3. The stopper according to claim 1, wherein an outer edge of a part opposite to the notch is formed in a semicircular shape in the counterbore.   The stopper according to any one of claims 1 to 3, wherein a length of the main body in a direction in which the contact portion is in contact with the main body is longer than a length of the main body in the intersecting direction.   The recessed part or the penetration part is formed in the said body at the side where the length to the end of the said main body is long with respect to the said insertion hole in the direction which the said contact part contacts. Stopper. The stopper according to any one of claims 1 to 5,
The bolt,
A stopper fixing structure in which a front end surface of a head portion of the bolt is positioned outside the predetermined surface of the main body.

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