JP2015202530A - Tightening machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tightening machine including a connection structure between an outer sleeve and an outer socket holder which enables reduction of a difference between diameters of the outer sleeve and an outer socket.SOLUTION: A tightening machine 10 of the invention includes an outer shaft 30 which rotates in a direction opposite to an inner shaft 20. The outer shaft 30 includes: an outer sleeve 40 in which an inner gear 41 is formed at an inner periphery; an engagement ring 50; an outer socket holder 60; and engagement means 70.

Description

  The present invention relates to a tightening machine including an outer shaft to which a socket can be attached and detached, and more specifically to a connection structure between an outer sleeve of an outer shaft and an outer socket holder.

  2. Description of the Related Art As a tightening machine used for tightening fastening members such as bolts and nuts, a tightening machine having an output shaft composed of an outer shaft and an inner shaft rotating in opposite directions is known.

  For example, in Patent Document 1, the outer shaft includes an outer sleeve having an inner gear formed on the inner surface, and an outer socket holder that is fixed to the distal end of the outer sleeve and to which the outer socket is detachably mounted.

  The outer sleeve needs to be engraved with an inner gear, and a planetary gear mechanism that meshes with the inner gear, an inner shaft, and the like need to be disposed. Therefore, the outer sleeve and the outer socket holder are connected by a C-shaped retaining ring or screws.

JP 2012-125874 A (for example, FIG. 1 and FIG. 6)

  In order to perform a tightening operation in a narrow place, there is a demand for reducing the diameter of the outer shaft. That is, it is desired to reduce the outer diameter of the outer sleeve so as to approach the diameter of the outer socket holder. However, in the case of the connection structure described in Patent Document 1, the outer diameter of the outer sleeve is about 20% thicker than the outer diameter of the outer socket holder.

  Further, when the outer sleeve and the outer socket holder are connected by screws, the outer socket holder may fall off from the outer sleeve due to loosening of the screws.

  An object of the present invention is to provide a tightening machine having a connection structure between an outer sleeve and an outer socket holder that can reduce the difference in diameter between the outer sleeve and the outer socket.

In order to solve the above problems, the tightening machine of the present invention provides:
A clamping machine having an outer shaft that rotates in the opposite direction with respect to the inner shaft,
The outer shaft is
A first sleeve having an inner gear formed on an inner periphery thereof, an arc-shaped first convex portion projecting from a tip of the first sleeve, a first concave portion formed between the first convex portions, An outer sleeve comprising: a first groove recessed in the circumferential direction on the inner periphery of the first convex portion;
A ring portion that fits on the inner periphery of the first sleeve, and an arc-shaped second convex portion that protrudes from the tip of the ring portion, the first convex portion being located on the inner periphery of the first convex portion; A second protrusion having a second extending portion whose tip extends longer than the protrusion, and a second protrusion that protrudes in the circumferential direction on the outer periphery of the second protrusion and fits into the first groove An engagement ring comprising: a second recess formed between the second protrusions; and a second groove formed in a circumferential direction on the outer periphery of the second extension part, By inserting the ring portion into the first sleeve and rotating the engagement ring in a circumferential direction with respect to the outer sleeve from a state in which the second convex portion and the first concave portion are opposed to each other, An engagement ring in which the second protrusion is fitted into the first groove, and the first protrusion and the second protrusion are opposed to each other.
A third sleeve having a mounting portion to which a socket can be attached at a distal end; a third convex portion protruding from a proximal end of the third sleeve and fitted into the opposed first concave portion and the second concave portion; A third concave portion formed between the three convex portions, and the first concave portion formed on the base end side of the third convex portion, when the third convex portion is opposed to the first concave portion and the second concave portion, An outer socket holder comprising two grooves and a third groove aligned in the circumferential direction;
Locking means that fit into the second and third grooves aligned,
With

  According to the tightening machine of the present invention, the outer shaft can fix the outer sleeve and the engagement ring so as not to move in the axial direction by fitting the first groove and the second protrusion. In addition, after the engagement ring is assembled to the outer sleeve, the third convex portion of the outer socket holder is fitted into the aligned first concave portion and second concave portion, so that the outer sleeve cannot be rotated in the circumferential direction, and The engagement ring is also not rotatable in the circumferential direction with respect to the outer sleeve. And an outer socket holder is fixed so that it cannot move to an axial direction with respect to an engagement ring by fitting a latching means in the aligned 2nd groove and 3rd groove. Accordingly, the outer sleeve, the engagement ring, and the outer socket holder can be integrally connected so as not to move in the axial direction and to rotate in the circumferential direction.

  Further, according to the tightening machine of the present invention, since the outer shaft can be made unnecessary for screwing, the problem that the outer socket holder falls off due to loosening of the screw can be solved.

  Moreover, according to this structure, since the outer diameter of an outer sleeve can be made small, it can respond also to the fastening operation | work in a narrow location.

FIG. 1 is an explanatory diagram of a tightening machine according to an embodiment of the present invention, and shows a cross-section of a main part thereof. FIG. 2 is an exploded perspective view of the outer shaft. FIG. 3 is a perspective view showing an outer shaft assembling process, and shows a state in which an engagement ring is fitted to the outer sleeve. FIG. 4 is a perspective view showing the assembly process of the outer shaft, and shows a state in which the engagement ring is rotated. FIG. 5 is a perspective view showing the outer shaft assembling process and shows a state in which the outer socket holder is fitted. FIG. 6 is a perspective view of the outer shaft assembled by fitting the locking means.

  Hereinafter, a tightening machine 10 according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a cross-sectional view of a main part of the tightening machine 10.
As shown in FIG. 1, the clamping machine 10 is formed by protruding a cylindrical casing 12 from a clamping machine body 11. An inner shaft 20 and an outer shaft 30 are arranged concentrically at the tip of the casing 12.

  The inner shaft 20 and the outer shaft 30 are disposed so as to be rotatable in directions opposite to each other via a planetary gear mechanism 14 from a drive source 13 such as a motor. Further, when a so-called shear bolt having a shearing tip is used through the planetary gear mechanism 14, a discharge pin 15 is provided for discharging the sheared tip.

  A socket 90 that engages with a fastening member is detachable at the distal ends of the shafts 20 and 30. The socket 90 can be composed of an inner socket 91 and an outer socket 92 that can rotate in opposite directions. The inner socket 91 engages with a shear bolt shearing tip and is attached to the tip of the inner shaft 20. The outer socket 92 engages with a nut or the like and is attached to the tip of the outer shaft 30.

  Note that a reaction force receiver can be formed or attached to the outer socket 92 as necessary.

  In the tightening machine 10 configured as described above, according to the present invention, the outer shaft 30 includes an outer sleeve 40, an engagement ring 50, an outer socket holder 60, and a locking means 70, as shown in FIGS. be able to. Examples of the locking means 70 include C-shaped retaining rings and spiro locks.

  To describe each configuration in more detail, the outer sleeve 40 has an inner gear 41 engraved on the inner periphery thereof as shown in FIG. 1 and is linked to the planetary gear mechanism 14 so as to be able to transmit power.

  As shown in FIG. 2, the outer sleeve 40 has a plurality of first protrusions 43 projecting from the tip of the first sleeve 42 in which the inner gear 41 is engraved, substantially parallel to the axis. The first convex portion 43 can be formed in an arc shape having the same curvature as the peripheral surface of the first sleeve 42.

  The first protrusions 43 can be formed at regular intervals at the tip of the first sleeve 42. A first concave portion 44 is formed between the first convex portions 43 and 43 by the adjacent first convex portions 43 and 43. In the illustrated embodiment, the first convex portion 43 and the first concave portion 44 have the same circumferential width, but the first convex portion 43 fits into a third concave portion 66 of the outer socket holder 60 described later. In other words, if the third convex portion 65 is fitted and meshed with the first concave portion 44, it is not necessary to have the same width. Further, for example, the first protrusions 43 and 43 may have the same width, the first recesses 44 and 44 may have the same width, and the widths of the first protrusion 43 and the first recess 44 may be changed.

  The circumferential end surface of the first convex portion 43 is parallel to the vertical plane passing through the axis of the first sleeve 42, that is, the first convex portion 43 and the first concave portion 44 become narrower toward the axial center. Can be formed.

  As shown in FIG. 2, the first groove 45 is recessed at the same height position on the inner peripheral side of each first convex portion 43 in the circumferential direction.

  The engagement ring 50 is attached to the outer sleeve 40 having the above configuration.

  As shown in FIG. 2, the engagement ring 50 includes a ring portion 51 that fits on the inner periphery of the first sleeve 42 and a second convex portion 52 that projects from the tip of the ring portion 51.

  The ring portion 51 can be a short annular body having an outer diameter that is in sliding contact with the inner periphery of the first sleeve 42 of the outer sleeve 40.

  The second convex portion 52 can be formed in an arc shape having the same curvature as the peripheral surface of the ring portion 51. And the 2nd convex part 52 is provided by the same number as the 1st convex part 43 of the said 1st sleeve 42, and the 2nd convex parts 52 and 52 adjoin between the 2nd convex parts 52 and 52 adjacent. A second recess 53 is formed.

  The end surface in the circumferential direction of the second convex portion 52 can be formed to be parallel to the vertical plane passing through the axis of the ring portion 51, that is, to have a width narrower toward the axis.

  More specifically, as shown in FIG. 4 described later, the second convex portion 52 and the second concave portion 53 are overlapped with the first convex portion 43 and the second concave portion 53 are overlapped with the first concave portion 44. Sometimes, the end faces can be formed at intervals that are aligned so that they are coplanar. The second convex portion 52 has a width that falls within the width of the first convex portion 43 when it overlaps the first convex portion 43, that is, the second convex portion 52 is narrower than shown in the drawing, and the second concave portion 53. By making the width wide, it is possible to easily mount the outer sleeve 40 and engage with the outer socket holder 60 described later.

  As shown in FIG. 4, the second protrusion 52 is fitted into the first groove 45 of the first protrusion 43 in a state where the first protrusion 43 and the second protrusion 52 are overlapped with each other. A protrusion 54 is provided in the circumferential direction. When the second protrusion 54 is fitted into the first groove 45, the bottom surface of the second recess 53 recedes to the base end side relative to the bottom surface of the first recess 44, that is, the bottom surface of the first recess 44. It is desirable to form such that protrudes toward the tip side.

  Further, as shown in FIG. 4, the tip of the second protrusion 52 is in a state where the first protrusion 43 and the second protrusion 52 are overlapped and the second protrusion 54 is fitted in the first groove 45. A second extending portion 55 extending longer than the tip of the first convex portion 43 is formed. The second extending portion 55 has a second groove 56 recessed in the circumferential direction on the outer periphery. The second groove 56 is formed so that the groove edge is aligned with the tip surface of the first convex portion 43.

  However, the engagement ring 50 is fitted to the outer sleeve 40 having the above configuration. More specifically, as shown in FIGS. 2 and 3, the ring portion 51 of the engagement ring 50 is inserted from the distal end side of the outer sleeve 40 (indicated by an arrow A in FIG. 2). At this time, as shown in FIG. 2, the phase is adjusted so that the first concave portion 44 of the outer sleeve 40 and the second convex portion 52 of the engagement ring 50 face each other.

  Then, as shown in FIG. 3, the engagement ring 50 is inserted until the height of the first groove 45 and the second protrusion 54 is aligned. In this state, the engagement ring 50 is indicated by an arrow B in FIG. Thus, the engagement ring 50 is rotated with respect to the outer sleeve 40. As shown in FIG. 4, the rotation angle is an angle at which the first convex portion 43 and the second convex portion 52 overlap and the first concave portion 44 and the second concave portion 53 overlap and communicate with each other.

  As described above, as shown in FIG. 4, the outer sleeve 40 and the engagement ring 50 are connected without being displaced in the axial direction.

  The outer socket holder 60 is attached to the first assembly 80 formed by connecting the outer sleeve 40 and the engagement ring 50.

  As shown in FIG. 3, the outer socket holder 60 has a mounting portion 61 to which the outer socket 92 of the socket 90 (see FIG. 1) is attached at the tip. The mounting portion 61 engages with the outer socket 92 and connects the outer socket 92 with the outer socket holder 60 so as to rotate together with the outer socket 92. It can be set as the structure containing the screw hole 63 which attaches the screw | thread 63a which penetrate | invades into the groove | channel 93. FIG. Note that the screw holes 63 are not shown in FIGS.

  The outer socket holder 60 includes a third sleeve 64 having a diameter smaller than that of the first sleeve 42 and a third convex portion 65 projecting from the base end of the third sleeve 64. The mounting portion 61 described above is formed at the tip of the third sleeve 64.

  The outer diameter of the third sleeve 64 can be formed to substantially match the inner diameter of the first sleeve 42, that is, to substantially match the outer diameter of the ring portion 51 of the engagement ring 50. Further, the inner diameter of the third sleeve 64 can be formed so as to substantially match the inner diameter of the ring portion 51.

  As shown in FIGS. 3 and 4, the third convex portion 65 is formed to fit into the first concave portion 44 and the second concave portion 53 that communicate with each other in the first assembly 80 described above. In addition, a third concave portion 66 is formed between the third convex portions 65 and 65 by the adjacent third convex portions 65 and 65. More specifically, the third projecting portion 65 extends from the base end of the third sleeve 64, and fits into the second recessed portion 53, and from the third extending portion 67 toward the outer periphery. It has a third bulge portion 68 that bulges and fits into the first recess 44.

  The third extending portion 67 is formed so that the thickness in the radial direction substantially matches the thickness in the radial direction of the second recess 53, and the third bulging portion 68 has the first thickness in the radial direction. The recess 44 can be formed so as to substantially match the thickness in the radial direction. That is, the outer socket holder 60 has the largest outer diameter at the third bulging portion 68, and the outer diameter substantially coincides with the outer diameter of the outer sleeve 40.

  Further, the third extending portion 67 is formed so that the height in the direction parallel to the axis substantially coincides with the height of the second recess 53, and the third bulging portion 68 is in the direction parallel to the axis. Can be formed so that the height of the first concave portion 44 substantially coincides with the height of the first concave portion 44.

  In the present embodiment, when the first assembly 80 is formed with a step at a position where the bottom surface of the second recess 53 recedes to the base end side rather than the bottom surface of the first recess 44, as shown in FIG. In addition, the third extending portion 67 is formed so as to protrude on the base end side from the third bulging portion 68.

  On the distal end side of the third extending portion 67, that is, on the third sleeve 64 side, a third groove 69 is recessed in the circumferential direction on the outer periphery. The third groove 69 is formed so that the groove edge is aligned with the tip-side surface of the third bulge portion 68. More specifically, the groove width of the third groove 69 substantially matches the groove width of the second groove 56, and the outer socket holder 60 is connected to the first assembly 80 (FIG. 4) as shown in FIG. Then, the third groove 69 is formed so as to be continuous with the second groove 56.

  However, the outer socket holder 60 having the above configuration is attached to the first assembly 80. More specifically, the outer socket holder 60 is fitted from the front end side of the first assembly 80 as shown by an arrow C in FIG. At this time, as shown in FIG. 4, the third convex portion 65 of the outer socket holder 60 is adjusted in phase so as to face the first concave portion 44 and the second concave portion 53 communicated with the first assembly 80.

  Then, as shown in FIG. 5, the outer socket holder 60 is fitted by fitting the third extending portion 67 of the third convex portion 65 into the second concave portion 53 and fitting the third bulging portion 68 into the first concave portion 44. The second assembly 82 is manufactured by meshing with the first assembly 80. At this time, the third concave portion 66 of the outer socket holder 60 meshes with the second convex portion 52. Accordingly, the outer socket holder 60 can be attached to the first assembly 80 so as not to rotate in the circumferential direction.

  In the present embodiment, as described above, the first assembly 80 is formed with a step at a position where the bottom surface of the second recess 53 recedes to the base end side relative to the bottom surface of the first recess 44, and the third extension The portion 67 is formed so that the base end side protrudes from the third bulging portion 68, and thus the protruding third extending portion 67 fits into the second recessed portion 53, so that the outer socket holder 60 can be easily positioned. The wobbling in the radial direction can also be suppressed.

  Subsequently, with respect to the second assembly 82, as shown in FIG. 5, by attaching a locking means 70 such as a C-shaped retaining ring or a spiro lock to the continuous second groove 56 and third groove 69. The outer socket holder 60 can be made immovable in the axial direction of the first assembly 80 (indicated by arrow D in FIG. 5), and the outer shaft 30 shown in FIG. 6 is produced.

  According to the connection structure of the outer shaft 30 of the present invention, the outer shaft 30 has a difference in outer diameter between the first sleeve 42 of the outer sleeve 40 and the third sleeve 64 of the outer socket holder 60 by the thickness of the outer sleeve 40. Just do it. Accordingly, the outer sleeve 40 can be reduced in diameter, which is suitable for tightening work in a narrow place.

  The obtained outer shaft 30 is mounted on the tightening machine 10 in a known manner, and by mounting the outer socket 92, it can be used for tightening fastening members such as bolts and nuts.

  The above description is for explaining the present invention, and should not be construed as limiting the invention described in the claims or limiting the scope thereof. Further, the configuration of each part of the present invention is not limited to the above-described embodiment, and various modifications can be made within the technical scope described in the claims.

  For example, the number, width, and interval of the convex portions and concave portions are not limited to the above embodiment. Further, the configuration of the mounting portion 61 for mounting the outer socket 92 is not limited to the above embodiment.

10 Clamping machine 20 Inner shaft 30 Outer shaft 40 Outer sleeve 42 First sleeve 43 First convex portion 44 First concave portion 45 First groove 50 Engagement ring 51 Ring portion 52 Second convex portion 53 Second concave portion 54 Second Projection 44 Second extension 56 Second groove 60 Outer socket holder 64 Third sleeve 65 Third projection 66 Third recess 67 Third extension 68 Third bulge 69 Third groove 70 Locking Means 90 socket

Claims (4)

A clamping machine having an outer shaft that rotates in the opposite direction with respect to the inner shaft,
The outer shaft is
A first sleeve having an inner gear formed on an inner periphery thereof, an arc-shaped first convex portion projecting from a tip of the first sleeve, a first concave portion formed between the first convex portions, An outer sleeve comprising: a first groove recessed in the circumferential direction on the inner periphery of the first convex portion;
A ring portion that fits on the inner periphery of the first sleeve, and an arc-shaped second convex portion that protrudes from the tip of the ring portion, the first convex portion being located on the inner periphery of the first convex portion; A second protrusion having a second extending portion whose tip extends longer than the protrusion, and a second protrusion that protrudes in the circumferential direction on the outer periphery of the second protrusion and fits into the first groove An engagement ring comprising: a second recess formed between the second protrusions; and a second groove formed in a circumferential direction on the outer periphery of the second extension part, By inserting the ring portion into the first sleeve and rotating the engagement ring in a circumferential direction with respect to the outer sleeve from a state in which the second convex portion and the first concave portion are opposed to each other, An engagement ring in which the second protrusion is fitted into the first groove, and the first protrusion and the second protrusion are opposed to each other.
A third sleeve having a mounting portion to which a socket can be attached at a distal end; a third convex portion protruding from a proximal end of the third sleeve and fitted into the opposed first concave portion and the second concave portion; A third concave portion formed between the three convex portions, and the first concave portion formed on the base end side of the third convex portion, when the third convex portion is opposed to the first concave portion and the second concave portion, An outer socket holder comprising two grooves and a third groove aligned in the circumferential direction;
Locking means that fit into the second and third grooves aligned,
With
Tightening machine. In the outer socket holder, the outer diameter of the third sleeve is the same as the outer diameter of the second convex portion of the engagement ring, and the outer diameter of the third convex portion is the outer diameter of the first sleeve. Is the same as
The clamping machine according to claim 1. The third convex portion extends from a proximal end of the third sleeve and fits into the second concave portion, and bulges toward the outer periphery from the third extended portion, and the first concave portion Having a third bulge that fits into the
The tightening machine according to claim 1 or 2. The third extending portion has a radial thickness substantially equal to a radial thickness of the second recess, and the third bulging portion has a radial thickness in the radial direction of the first recess. Approximately matches the thickness,
The clamping machine according to claim 3.

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