JP2006189065A - Fitting structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To hinder the occurrence of excessive vibration in a rotary shaft 5 by stabilizing fixing condition of a member 3 to be fitted to the rotary shaft 5. <P>SOLUTION: A fitting shaft 7 possible to be tightly fitted in a fitting hole 9 of the fitted member 3 is coaxially and integrally formed with an end surface of the rotary shaft 5, and a first screw shaft 11 is coaxially and continuously formed to the fitting screw 7 for integration. A first male screw part 13 is thread-cut in the outer peripheral surface of the first screw shaft 11, and a first nut 15 is provided in the outer peripheral surface of the first screw shaft 11. A first female screw part 17 to be screwed to the first male screw part 13 is thread-cut in the inner peripheral surface of the first nut 15, and a second screw shaft 19 is coaxially and continuously formed to the first screw shaft 11 for integration. A second male screw part 21 having outside diameter smaller than the inner diameter of the first nut 13 is provided in the outer peripheral surface of the second screw shaft 19 in a direction opposite to the first male screw part 13. A second nut 23 is provided in the outer peripheral surface of the second screw shaft 19, and a second female screw part 25 to be screwed to the second male screw part 21 is thread-cut in the inner peripheral surface of the second nut 23. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an attachment structure for integrally attaching a member to be attached such as a power transmission member to a base member such as a rotating member.

  In various machines such as a turbo compressor, a double nut type mounting structure is used, and this mounting structure is configured such that a power transmission member (one of the mounted members) such as a gear is integrated with a rotating shaft. The structure for mounting is as follows.

  That is, a mounting shaft is integrally formed coaxially with the end surface of the rotating shaft, and the mounting shaft can be firmly fixed to a mounting hole formed in the power transmission member. Further, a screw shaft is continuously formed integrally with the mounting shaft, and a male screw portion is screwed on the outer peripheral surface of the screw shaft. And the 1st nut which can press the said power transmission member to the end surface side of the said rotating shaft is provided in the outer peripheral surface of the said screw shaft, The said outer thread part is provided in the inner peripheral surface of this 1st nut. A first female screw portion to be screwed is screwed. Furthermore, a second nut capable of pressing the first nut toward the end surface of the rotating shaft is provided on the outer peripheral surface of the screw shaft, and the male screw portion is provided on the inner peripheral surface of the second nut. A second female screw portion to be screwed is screwed. Here, the mounting structure is configured such that the directions of the first female screw portion and the second female screw portion are the same as the direction of the main torque acting on the power transmission member.

  Therefore, first, the mounting shaft and the mounting hole of the power transmission member are firmly joined. Then, by tightening the first nut with respect to the screw shaft, the power transmission member is pressed toward the end surface of the rotating shaft by the first nut. Further, by tightening the second nut with respect to the screw shaft, the first nut is pressed toward the end surface of the rotating shaft by the second nut, and a tensile force is applied to the screw shaft to thereby provide the first nut. The female screw portion and the second female screw portion can be brought into firm contact with the male screw portion. Accordingly, the power transmission member can be integrally attached to the rotating shaft (in other words, fixed to the rotating shaft) while suppressing the looseness of the first nut.

  In addition, since the mounting structure is configured such that the direction of the first female screw portion and the second female screw portion is the same as the direction of the main torque, even if the main torque acts on the power transmission member. The first nut and the second nut are not loosened, only to rotate in a direction to be fastened to the first nut and the second nut.

In addition, there exists what is shown to patent document 1 as a prior postoperative technique relevant to this invention.
JP 2001-82436 A

  Incidentally, in addition to the main torque, there is a case where a torque in a direction opposite to the main torque acts on the power transmission member. In such a case, the first nut and the second nut are loosened. Try to rotate. Therefore, when the torque in the reverse direction is large, the first nut and the second nut rotate in the loosening direction with respect to the rotating shaft, and the pressing force (tightening force) of the first nut becomes weak, The fixed state of the power transmission member with respect to the rotating shaft cannot be maintained, and power transmission (torque transmission) by the power transmission member may become unstable.

  Therefore, an object of the present invention is to provide a mounting structure having a novel configuration that can solve the above-described problems.

A first feature of the present invention is an attachment structure for integrally attaching a member to be attached to a base member.
An attachment shaft that is integrally formed with or integrally provided with the base member, and that can be firmly attached to an attachment hole formed in the attached member;
A first screw shaft that is integrally formed coaxially with the mounting shaft and has a first male screw threaded on the outer peripheral surface;
A first nut provided on an outer peripheral surface of the first screw shaft, and having a first female screw portion threadedly engaged with the first male screw portion on an inner peripheral surface, and capable of pressing the attached member toward the base member side. When;
A second male screw portion having an outer diameter smaller than the inner diameter of the first nut is formed on the outer peripheral surface in a direction opposite to the direction of the first male screw portion. A second screw shaft;
A second nut provided on the outer peripheral surface of the second screw shaft, and having a second female screw portion threadedly engaged with the second male screw portion on the inner peripheral surface, and capable of pressing the first nut toward the base member side. When;
It is that it was equipped.

  Here, the attached member includes a power transmission member such as a gear, a sprocket, and a pulley. The base member includes a rotation shaft and the like.

  According to the first feature of the present invention, first, the mounting shaft and the mounting hole of the mounted member are firmly joined. And by inserting the second screw shaft relative to the first nut and tightening the first nut with respect to the first screw shaft, the attached member is moved by the first nut. Press toward the base member. Furthermore, by tightening the second nut with respect to the second screw shaft, the first nut is pressed toward the base member by the second nut. Accordingly, the attached member can be integrally attached to the base member (in other words, fixed to the base member) while suppressing the looseness of the first nut.

  Further, since the second male screw portion is screwed on the outer peripheral surface of the second screw shaft in a direction opposite to the direction of the first male screw portion, in other words, the direction of the first male screw portion and the second Since the direction of the male screw portion is reverse, when a positive torque (for example, main torque) is applied to the attached member, it tries to rotate in the direction in which the first nut is tightened, while the reverse direction is applied to the attached member. When torque is applied, the first nut attempts to rotate in a loosening direction, but the second nut attempts to rotate in a tightening direction. Therefore, if the first nut and the second nut are sufficiently tightened in advance, the first nut and the second nut will rotate even if the torque in the forward direction and the reverse direction acts on the attached member. There is nothing.

A second feature of the present invention is an attachment structure for integrally attaching a member to be attached to a rotating shaft,
A mounting shaft that is integrally formed coaxially with the end surface of the rotating shaft, can be firmly fitted in a mounting hole formed in the mounted member, and has an outer diameter smaller than the outer diameter of the rotating shaft;
A first screw shaft that is integrally formed coaxially with the mounting shaft and has a first male screw threaded on the outer peripheral surface;
A first female screw portion provided on the outer peripheral surface of the first screw shaft and screwed into the first male screw portion on the inner peripheral surface is screwed, and the attached member can be pressed to the end surface side of the rotary shaft. 1 nut;
A second male screw portion having an outer diameter smaller than the inner diameter of the first nut is screwed in an opposite direction to the first male screw portion on the outer peripheral surface. Two screw shafts;
A second female screw portion provided on the outer peripheral surface of the second screw shaft and screwed into the second male screw portion on the inner peripheral surface is screwed, and the first nut can be pressed toward the end surface side of the rotary shaft. With two nuts;
It is that it was equipped.

  Here, the attached member includes a power transmission member such as a gear, a sprocket, and a pulley.

  According to the second feature of the present invention, first, the mounting shaft and the mounting hole of the mounted member are firmly joined. And by inserting the second screw shaft relative to the first nut and tightening the first nut with respect to the first screw shaft, the attached member is moved by the first nut. Press toward the end face of the rotating shaft. Furthermore, by tightening the second nut with respect to the second screw shaft, the first nut is pressed toward the end surface of the rotating shaft by the second nut. Accordingly, the attached member can be integrally attached to the rotating shaft (in other words, fixed to the rotating shaft) while suppressing the looseness of the first nut.

  Further, since the second male screw portion is screwed on the outer peripheral surface of the second screw shaft in a direction opposite to the direction of the first male screw portion, in other words, the direction of the first male screw portion and the second Since the direction of the male screw portion is reverse, when a positive torque (for example, main torque) is applied to the attached member, it tries to rotate in the direction in which the first nut is tightened, while the reverse direction is applied to the attached member. When torque is applied, the first nut attempts to rotate in a loosening direction, but the second nut attempts to rotate in a tightening direction. Therefore, if the first nut and the second nut are sufficiently tightened in advance, the first nut and the second nut will rotate even if the torque in the forward direction and the reverse direction acts on the attached member. There is nothing.

  As described above, according to the present invention, the first nut and the second nut do not rotate even when forward and reverse torques act on the mounted member. The pressure (tightening force) can be sufficiently maintained, and the fixed state of the mounted member with respect to the base member (or the rotating shaft) can be reliably maintained.

  An embodiment of the present invention will be described with reference to FIGS. 1 and 2.

  Here, FIG. 1 is a sectional view of the mounting structure according to the embodiment of the present invention, and FIG. 2 is an exploded view of the mounting structure according to the embodiment of the present invention. In the figure, “F” indicates the front and “R” indicates the rear.

  As shown in FIGS. 1 and 2, the mounting structure 1 according to the embodiment of the present invention is used in a rotary machine such as a turbo compressor, for example, and a gear 3 as a power transmission member is integrated with a rotary shaft 5. The structure for mounting is as follows.

  That is, an attachment shaft 7 having an outer diameter smaller than the outer diameter of the rotation shaft 5 is integrally formed on the end surface of the rotation shaft 5 coaxially. The attachment shaft 7 is formed in an attachment hole formed in the center of the gear 3. 9 can be bonded by shrink fitting or clearance fitting.

  A first screw shaft 11 is integrally and continuously formed coaxially with the mounting shaft 7, and a first male screw having the same outer diameter as the outer diameter of the mounting shaft 7 is formed on the outer peripheral surface of the first screw shaft 11. A portion (right male screw portion) 13 is screwed. Here, the mounting structure 1 is configured such that the direction of the first male screw portion 13 is the same as the direction of the main torque acting on the gear 3. In the embodiment of the present invention, the outer diameter of the first male screw portion 13 is the same as the outer diameter of the mounting shaft 7. A part of the first male screw portion 13 extends to the front portion of the outer peripheral surface of the mounting shaft 7.

  A first nut 15 that can be pressed toward the end surface of the rotary shaft 5 is provided on the outer peripheral surface of the first screw shaft 11. A first male screw portion 13 is provided on the inner peripheral surface of the first nut 15. A first female threaded portion (right female threaded portion) 17 is formed to be screwed with the first female threaded portion.

  A second screw shaft 19 is integrally and continuously formed coaxially with the first screw shaft 11, and an outer diameter of the second screw shaft 19 is smaller than an inner diameter of the first nut 15. A second male screw portion (left male screw portion) 21 is screwed in the direction opposite to the first male screw portion 13. In the embodiment of the present invention, the outer diameter of the second male screw portion 21 is 1 mm smaller than the outer diameter of the first male screw portion 13, and the pitch of the second male screw portion 21 is the same as that of the first male screw portion 13. Same as pitch.

  A second nut 23 is provided on the outer peripheral surface of the second screw shaft 19 so that the first nut 15 can be pressed toward the gear 3 (in other words, the end surface of the rotary shaft 5). On the inner peripheral surface of the nut 23, a second female screw portion (left female screw portion) 25 that is screwed into the second male screw portion 21 is screwed. Here, in order to prevent the second nut 23 from loosening with respect to the second male screw portion 21 of the second screw shaft 19, a circumferential groove 27 is formed in the front portion of the inner peripheral surface of the second nut 23. The annular groove 27 is fitted with an annular or C-shaped leaf spring 29 that presses against a part of the second male screw portion 25. In addition, since the leaf spring 29 as the loosening prevention means is known, details of the configuration of the leaf spring are omitted.

  The second screw shaft 19 is integrally and continuously formed with a tip shaft 31 having an outer diameter smaller than the outer diameter of the second male screw portion 21.

  Next, the operation of the embodiment of the present invention will be described.

  First, the mounting shaft 7 and the mounting hole 9 of the gear 3 are firmly attached by shrink fitting or clearance fitting. Then, the second screw shaft 19 and the tip shaft 31 are inserted relative to the first nut 15, and the first nut 15 is tightened with respect to the first screw shaft 11. To the end face side of the rotating shaft 5. Furthermore, by inserting the tip shaft 31 relative to the second nut 23 and tightening the second nut 23 against the second screw shaft 19, the first nut 15 is rotated by the second nut 23 to the rotating shaft 5. Press toward the end face side. Accordingly, the gear 3 can be integrally attached to the rotating shaft 5 (in other words, fixed to the rotating shaft 5) while suppressing the looseness of the first nut 15.

  Further, since the second male screw portion 21 is screwed on the outer peripheral surface of the second screw shaft 19 in the direction opposite to the direction of the first male screw portion 13, in other words, the direction of the first male screw portion 13 and the second male screw portion. Since the direction of the portion 21 is reverse, when a forward torque acts on the gear 3, the first nut 15 tries to rotate in the tightening direction, whereas when a reverse torque acts on the gear 3, the first nut 15 Tries to rotate in the loosening direction, but the second nut 23 tries to rotate in the tightening direction. Accordingly, if the first nut 15 and the second nut 23 are sufficiently tightened in advance, even if the torque in the forward direction (the direction of the main torque in the embodiment of the present invention) and the reverse direction act on the gear 3. The first nut 15 and the second nut 23 do not rotate.

  Further, the leaf spring 29 is pressed against a part of the second male screw portion 25, whereby the second nut 23 can be prevented from loosening with respect to the second male screw portion 21 of the second screw shaft 19.

  As described above, according to the embodiment of the present invention, if the first nut 15 and the second nut 23 are sufficiently tightened in advance, even if torque in the forward direction and the reverse direction acts on the gear 3, the first nut 15 and the second nut 23 do not rotate, the pressing force (tightening force) of the first nut 15 can be sufficiently maintained, and the fixed state of the gear 3 with respect to the rotating shaft 5 can be reliably maintained. The power transmission (torque transmission) by the gear 3 does not become unstable. In particular, since the second nut 23 can be prevented from loosening with respect to the second male screw portion 21 of the second screw shaft 19, the above-described effects can be further improved.

  In addition, this invention is not restricted to description of embodiment of the above-mentioned invention, For example, change of embodiment can be performed as follows.

  That is, the outer diameter of the mounting shaft 7, the outer diameters of the first male screw portion 13 and the second male screw portion, the pitch, and the like can be appropriately changed. Further, instead of the gear 3, another power transmission member such as a sprocket or a pulley may be integrally attached to the end surface of the rotating shaft 5. Furthermore, instead of integrally attaching the power transmission member to the end surface of the rotating shaft 5, a member to be attached such as a power transmitting member may be integrally attached to a base member other than the rotating shaft 5.

It is sectional drawing of the attachment structure concerning embodiment of this invention. It is an exploded view of the attachment structure concerning the embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mounting structure 3 Gear 5 Rotating shaft 7 Mounting shaft 9 Mounting hole 11 1st threaded shaft 13 1st external thread part 15 1st nut 17 1st internal thread part 19 2nd threaded shaft 21 2nd external thread part 23 2nd nut 25 2nd Female thread part 29 Leaf spring

Claims (4)

In the mounting structure for integrally mounting the mounted member to the base member,
An attachment shaft that is integrally formed with or integrally provided with the base member, and that can be firmly attached to an attachment hole formed in the attached member;
A first screw shaft that is integrally formed coaxially with the mounting shaft and has a first male screw threaded on the outer peripheral surface;
A first nut provided on an outer peripheral surface of the first screw shaft, and having a first female screw portion threadedly engaged with the first male screw portion on an inner peripheral surface, and capable of pressing the attached member toward the base member side. When;
A second male screw portion having an outer diameter smaller than the inner diameter of the first nut is screwed in an opposite direction to the first male screw portion on the outer peripheral surface. Two screw shafts;
A second nut provided on the outer peripheral surface of the second screw shaft, and having a second female screw portion threadedly engaged with the second male screw portion on the inner peripheral surface, and capable of pressing the first nut toward the base member side. When;
A mounting structure characterized by comprising: In the mounting structure for mounting the mounted member integrally with the rotating shaft,
A mounting shaft that is integrally formed coaxially with the end surface of the rotating shaft, can be firmly fitted in a mounting hole formed in the mounted member, and has an outer diameter smaller than the outer diameter of the rotating shaft;
A first screw shaft that is integrally formed coaxially with the mounting shaft and has a first male screw threaded on the outer peripheral surface;
A first female screw portion provided on the outer peripheral surface of the first screw shaft and screwed into the first male screw portion on the inner peripheral surface is screwed, and the attached member can be pressed to the end surface side of the rotary shaft. 1 nut;
A second male screw portion having an outer diameter smaller than the inner diameter of the first nut is screwed in an opposite direction to the first male screw portion on the outer peripheral surface. Two screw shafts;
A second female screw portion provided on the outer peripheral surface of the second screw shaft and screwed into the second male screw portion on the inner peripheral surface is screwed, and the first nut can be pressed toward the end surface side of the rotary shaft. With two nuts;
A mounting structure characterized by comprising:   The mounting structure according to claim 2, wherein a direction of the first male screw portion is configured to be the same as a direction of main torque acting on the mounted member.   The said 2nd nut has a locking means which prevents a self-loosening with respect to the said 2nd external thread part of the said 2nd screw shaft, Any one of the Claims 1-3 characterized by the above-mentioned. The mounting structure according to any claim.

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