JP7446196B2 - Structure and method for attaching elements to shaft - Google Patents

Description

The present invention relates to a structure and method for attaching an element to a shaft, and in a specific embodiment, to a structure and method for attaching a sprocket to a shaft.

In the shutter device, a roller chain transmits the rotation of a sprocket on the opening/closing machine side to a sprocket on the shaft side of the winding body, thereby rotating the winding body and raising and lowering the shutter curtain to open and close the opening. In order to properly transmit the driving force from the opening/closing machine to the winding shaft, the roller chain needs to be wound with appropriate tension between the opening/closing machine sprocket and the shaft sprocket. To do this, the center of the opening/closing machine sprocket and the center of the shaft sprocket must match. In this specification, the core of a sprocket means the center of the sprocket in the thickness direction.

It is important to match the cores of the driving sprocket and the driven sprocket, but conventionally, alignment of the shaft sprocket and switchgear sprocket relies on the experience and skill of the on-site construction engineer. , installation errors may occur during construction (see Figure 10). Patent Document 1 discloses a sprocket misalignment inspection device for inspecting sprocket misalignment during maintenance or initial installation of a shutter device.

As mentioned above, since the shaft sprocket must be centered and fixed with respect to the switchgear sprocket, the shaft sprocket must be fixed in the axial direction of the shaft at the element attached to the shaft of the winder that winds up the shutter curtain. This is a typical example of an element that is accurately positioned and fixed. In addition to the shaft sprocket, there are other elements that must be accurately positioned and fixed in the axial direction of the shaft. For example, the cam plate disclosed in Patent Document 2 has a spiral cam groove on the surface, and the guide protrusion needs to move relatively along the cam groove. Accurate positioning of the cam groove of the cam plate (determined by the mounting position of the cam plate in the axial direction of the shaft) is required.
JP2018-87421 JP2018-44383

An object of the present invention is to provide a mounting structure and method that makes it possible to easily determine the positioning of an element to be mounted at a predetermined position in the axial direction of a shaft.

The technical means adopted by the present invention are:
A bracket with an insertion part,
a bearing provided on the bracket at the insertion portion;
a shaft that is inserted through the insertion part, is rotatably supported by the bracket by the bearing, and has an extension part located outside the bracket;
A mounting structure for an element that is fixed at a predetermined position in the axial direction of the extending portion of the shaft while being inserted through the extending portion,
A spacer having a peripheral surface portion having a predetermined length and an arc shape in cross section is attached to the outer peripheral surface of the shaft,
A first edge of the spacer in the longitudinal direction is in contact with a side surface of the bearing,
The element is fixed to the extension part with a side surface of the element on the bracket side in contact with a second end edge in the length direction of the spacer.
This is a structure for attaching elements to a shaft.

In one aspect, the bearing is provided on the back surface of the bracket,
The circumferential surface portion attached to the outer circumferential surface of the shaft extends from the outer circumferential surface of the extending portion of the shaft to the back side of the bracket through the insertion portion.
In one aspect, a first end edge of the spacer in the longitudinal direction is in contact with a side surface of an inner ring of the bearing.
In one aspect, the spacer is arranged such that the opening of the circumferential surface portion having an arc shape in cross-section is fitted onto the outer circumferential surface of the extending portion, and the spacer is configured to attach the extending portion from a direction perpendicular to the axial direction of the extending portion. It can be attached to the outer circumferential surface of the
In one aspect, the spacer is movable in the axial direction of the shaft while being attached to the outer peripheral surface of the shaft.

In one aspect, a key portion for fixing the element to the extending portion protrudes from an outer peripheral surface of the extending portion of the shaft,
The key portion is located in the opening of the peripheral surface of the spacer attached to the extension.

In one aspect, the element is a sprocket and is a structure for attaching the sprocket to the shaft.
More specifically, the first end edge of the spacer in the length direction is in contact with the side surface of the inner ring of the bearing provided on the back surface of the bracket,
The sprocket is fixed to the extending portion of the shaft with the side surface on the bracket side in contact with the second longitudinal end edge of the spacer.
The core of the sprocket, which is attached to the shaft using a spacer, coincides with the core of the switchgear sprocket.

In one embodiment, the element is a cam plate having a spiral cam groove on its surface, and is a structure for attaching the cam plate to the shaft.
More specifically, the first end edge of the spacer in the length direction is in contact with the side surface of the inner ring of the bearing provided on the back surface of the movable bracket,
The cam plate is fixed to the extending portion of the shaft with the side surface on the bracket side in contact with the second longitudinal end edge of the spacer.
The cam groove of the cam plate attached to the shaft using a spacer receives the guide protrusion at the tip of the arm provided on the fixed bracket at an appropriate depth position.

In the method of attaching an element to a shaft adopted by the present invention,
The shaft is inserted through an insertion portion of the bracket and is rotatably supported by a bearing provided on the bracket, and the shaft includes an extension portion located outside the bracket,
The element is adapted to be attached to a predetermined position in the axial direction of the extension part of the shaft while being inserted through the extension part,
preparing a spacer consisting of a circumferential surface portion having a predetermined length and an arc shape in cross section, and having an opening formed in the circumferential surface portion;
fitting the spacer onto the outer circumferential surface of the extending portion from a direction perpendicular to the axial direction of the extending portion so as to receive the extending portion from the opening of the circumferential surface portion;
bringing a first edge of the spacer in the longitudinal direction into contact with a side surface of the bearing;
bringing a bracket-side side surface of the element into contact with a second longitudinal end edge of the spacer;
The element and the extension are connected with the first longitudinal end edge of the spacer in contact with the side surface of the bearing, and the second longitudinal end edge in contact with the bracket-side side surface of the element. fixing the exit part;
including.

In one aspect, the element is fixed to the extension part using a key, and a key part for fixing the element to the extension part is provided on an outer peripheral surface of the extension part of the shaft. It has become prominent,
The spacer is fitted onto the outer circumferential surface of the extending portion such that the key portion is located in an opening in the circumferential surface of the spacer attached to the extending portion.

In the present invention, the mounting position of the element to be mounted at a predetermined position in the axial direction of the shaft is determined using a spacer with a predetermined length, which prevents the occurrence of mounting errors and improves the experience of construction engineers. To make it possible to easily carry out installation work without relying on knowledge or skilled skills.

FIG. 3 is a partial front view of the upper portion of the shutter device. FIG. 3 is a plan view of the upper portion of the shutter device. It is a partially enlarged view in FIG. 2, showing the positional relationship between the shaft sprocket and the opening/closing machine sprocket. It is a figure which shows the spacer for positioning. It is a figure which shows the spacer attached to the shaft end part. This is a view similar to FIG. 3, in which a single-boss type shaft sprocket is fixed to the shaft end. (A) is a view seen from direction A in FIG. 6, (B) is a view seen from direction B in FIG. 6, (C) is a view showing the aspect shown in FIG. 3 along (B). It is something that FIG. 3 is a plan view of the driven side of the movable winding mechanism. It is a front view of the driven side of a movable winding mechanism. Indicates that the shaft sprocket and opening/closing machine sprocket are misaligned.

FIG. 1 is a front view of the upper part of the shutter device. left and right brackets 3 and 4 that rotatably support both longitudinal ends of the winding body 2, an opening/closing machine 5 that is a rotational drive source for the winding body 2, a winding body 2, and a shutter wound around the winding body 2. It includes a shutter case 6 that accommodates the curtain 1, and left and right guide rails 7 that are erected at both widthwise ends of a building opening and guide both widthwise ends of the shutter curtain 1 in the height direction when opening and closing the opening. ing.

As shown in FIG. 2, the winding body 2 has shafts 20, 20 at the left and right ends rotatably supported by left and right brackets 3, 4, respectively, and a winding drum 21 that rotates integrally with the shafts 20, 20. The shutter curtain 1 is designed to be rolled up.

As shown in FIGS. 1, 2, and 7, the bracket 3 includes a rectangular plate-shaped surface portion 30, an upper side 31 is bent at the upper edge of the surface portion 30, and a lower side is formed at the lower edge of the surface portion 30. 32 is bent and has a front edge 33 at the front end and a base edge 34 at the rear end, and the bracket 3 has a base end side part of the surface part 30 fixed to the wall by a fixing piece 34' having an L-shape in cross section. The surface portion 30 extends vertically from the frame.

A groove portion 300 is formed in the surface portion 30 of the bracket 3 and extends horizontally from the central portion in the height direction of the front edge 33 toward the center portion of the surface portion. 300a (see FIG. 3). A bearing 8 is attached to the back surface of the surface portion 30 of the bracket 3 at the insertion portion 300a, and rotatably supports the shaft 20 that is inserted through the insertion portion 300a.

As shown in FIGS. 1 and 2, the bracket 4 includes a rectangular plate-shaped surface portion 40, an upper side 41 is bent at the upper edge of the surface portion 40, and a lower side 42 is bent at the lower edge of the surface portion 40. The bracket 4 includes a front edge 43 at the front end and a base edge 44 at the rear end, and the base end side of the surface portion 40 is fixed to the wall by a fixing piece 44' having an L-shape in cross section. extends vertically from the building frame. The surface portion 40 of the bracket 4 is formed with an insertion portion through which the shaft 20 is inserted. A bearing 8 is attached to the back surface of the surface portion 40 of the bracket 4 at the insertion portion, and rotatably supports the shaft 20 that is inserted through the insertion portion.

The bearing 8 consists of an inner ring 80, an outer ring 81, rolling elements 82 rotatably held between the inner ring 80 and the outside, and a housing 83 that accommodates these. It is fixed to the inner surface of the surface portion 40 of the bracket 4. The housing 83 and outer ring 81 of the bearing 8 are stationary parts, and the inner ring 80 is a movable part that can freely rotate relative to the outer ring 81.The shafts 20, 20 received in the inner ring 80 rotate together with the inner ring 80. It looks like this.

The shaft 20 is inserted through the insertion portion 300a of the surface portion 30 of the bracket 3, is rotatably supported by the bracket 3 by a bearing 8, and is inserted to the outside of the bracket 3 through the insertion portion 300a of the surface portion 30 of the bracket 3. It includes an extending portion 20A, and a sprocket 9 is fixed at a predetermined position in the axial direction of the extending portion 20A.

The sprocket 9 includes a cylindrical portion or boss 90 fixed to the outer circumferential surface of the extending portion 20A of the shaft 20, and a disc-shaped portion 91 having gears continuously formed in the circumferential direction of the periphery. A key groove is formed on the inner circumferential surface of the boss 90, and a key groove 200 is formed on the outer circumferential surface of the extending portion 20A of the shaft 20. , positioning the sprocket 9 at a predetermined position in the axial direction of the extension part 20A, inserting the key 201 into the keyway to restrict rotation of the boss 90 with respect to the extension part 20A, and fixing the key 201 with the bolt 202. Then, the sprocket 9 is attached to a predetermined position in the axial direction of the extension portion 20A.

The sprocket 9 shown in FIGS. 2 and 3 has a disk-shaped portion 91 extending from the outer circumferential surface of a boss 90, and is a so-called double-boss type sprocket 9, which is fixed to the extending portion 20A of the shaft 20. In this state, one end surface 900 of the boss 90 is a side surface portion of the sprocket 9 on the side closer to the surface portion 30 of the bracket 3 (see FIG. 7(C)).

The sprocket 9 shown in FIG. 6 is of a so-called single-boss type, and when the single-boss type sprocket 9 is fixed to the extending portion 20A of the shaft 20, the center portion of one surface portion 910 of the disc-shaped portion 91 is , is the side surface of the sprocket 9 that is closer to the surface 30 of the bracket 3 (see FIG. 7(B)).

An opening/closing machine bracket 3' is fixed to the front end side portion of the surface portion 30 of the bracket 3. The opening/closing machine bracket 3' has a rectangular surface part 30', an upper side 31' formed by bending at the upper edge of the surface part 30', and a lower side 32' formed by bending at the lower edge. The base end side of the surface portion 30' is overlapped with the front end side portion of the surface portion 30 of the bracket 3 and fixed with bolts. Note that the bracket 3 and the opening/closing machine bracket 3' may be integrally formed from the same member. The switch 5 is attached to the inside of the surface 30' of the switch bracket 3', and the shaft 50 of the switch 5 protrudes from the outside of the surface 30'. A switch sprocket 51 that rotates together with the switch 50 is provided.

As shown in FIG. 2, in the winding body 2, a shaft 20 on one end side is rotatably supported as a driving side end by a surface part 30 of a bracket 3 via a bearing 8, and a shaft 20 on the other end side is rotatably supported as a driving side end part. It is rotatably supported by the surface portion 40 of the bracket 4 via a bearing 8 as a driven side end portion. A sprocket 9 is provided on the extending portion 20A of the shaft 20 of the winding body 2, and the sprocket 9 is transmission-connected to the opening/closing machine sprocket 51 of the opening/closing machine 5 by a roller chain. The sprocket 9 is positioned and fixed to the extending portion 20A of the shaft 20 so that its core coincides with the core of the opening/closing machine sprocket 51. In this embodiment, the sprocket 9 is positioned and fixed to the extending portion 20A of the shaft 20 using a positioning spacer 10.

As shown in FIG. 4, the spacer 10 includes a circumferential surface portion 100 having an arc shape in cross section, and the circumferential surface portion 100 includes a first end edge 101 in the longitudinal direction of the circumferential surface portion 100 and a first end edge 101 in the longitudinal direction of the circumferential surface portion 100. A notch or opening 105 is provided between the first and second circumferential edges 103 and 104. is formed.

The spacer 10 is a metal member, and the dimensions of the opening 105 of the peripheral surface portion 100 are such that the spacer 10 is attached to the outer peripheral surface of the extending portion 20A of the shaft 20 from the front (in the direction perpendicular to the longitudinal direction or axial direction of the shaft 20). (having elasticity that can expand to the extent that the extension part 20A can be received from the opening 105), and to the extent that it can be maintained attached to the outer peripheral surface of the extension part 20A. The width dimension is . The circumferential surface portion 100 of the spacer 10 is attached so as to cover at least a portion larger than a half circumference of the outer circumference of the extension portion 20A. When the spacer 10 is attached to the outer circumferential surface of the extension part 20A from the front, it does not interfere with the key 201 that fixes the sprocket 9 to the extension part 20A.

The spacer 10 is slidably movable in the axial direction of the shaft 20 while attached to the outer peripheral surface of the extending portion 20A, and its fixed position relative to the shaft 20 is adjustable. The cross-sectional shape of the circumferential surface portion 100 of the spacer 10 according to the present embodiment is not an arc shape with a perfect circle cut out, but when it is attached to the outer circumferential surface of the extension portion 20A from below, it is fitted so as to sandwich it from both sides, and the circumferential surface portion The entire inner circumferential surface of the spacer 100 does not come into contact with the outer circumferential surface of the extending portion 20A, and a gap is formed between the lower end portion of the outer circumferential surface of the extending portion 20A and the circumferential surface portion 100 of the spacer 10.

The outer shape of the spacer 10 when attached to the outer circumferential surface of the extending portion 20A is smaller than the insertion portion 300a, and the first end side in the length direction of the circumferential surface portion 100 attached to the outer circumferential surface of the shaft 20 is attached to the outer circumferential surface of the shaft 20. It extends from the outer peripheral surface of the extending portion 20A of the bracket 20 to the back side of the surface portion 30 of the bracket 3 through the insertion portion 300a. That is, the first edge 101 of the peripheral surface portion of the spacer 10 is located on the back side of the surface portion 30 of the bracket 3.

The spacer 10 is attached to the outer peripheral surface of the shaft 20 with a first end 101 in the length direction in contact with a side surface 800 of the inner ring 80 of the bearing 8, and a second end edge 102 in the length direction is attached to the outer peripheral surface of the shaft 20. Depending on the position, the mounting position of the sprocket 9 in the longitudinal direction of the extending portion 20A of the shaft 20 is determined. When the side surface portion of the sprocket 9 on the bracket 3 side (the end surface 900 in the embodiment of FIG. 3, the center portion of the surface portion 910 in the embodiment of FIG. 6) is brought into contact with the second end edge 102 in the length direction of the spacer 10, the sprocket The core of 9 coincides with the core of the opening/closing machine sprocket 51.

The length dimension L of the spacer 10, that is, the distance between the first end edge 101 and the second end edge 102, is the distance between the first end edge 101 and the second end edge 102 when When the side surface portion of the sprocket 9 on the bracket 3 side (the end surface 900 in the embodiment of FIG. 3, the center portion of the surface portion 910 in the embodiment of FIG. 6) is brought into contact with the two end edges 102, the core of the sprocket 9 touches the switchgear sprocket 51. The dimensions are set to match the core of the

In this embodiment, the bearing 8 is fixed to the back surface of the surface part 30 of the bracket 3, and the surface part 30' of the switchgear bracket 3' to which the switchgear 5 (switcher sprocket 51) is attached is connected to the surface part 30 of the bracket 3. The position of the core of the opening/closing machine sprocket 51 is determined based on the side surface portion 800 of the inner ring 80 of the bearing 8, and therefore, the length dimension L of the spacer 10 can be determined.

The sprocket 9 has the first end edge 101 in the length direction of the spacer 10 in contact with the side surface 800 of the inner ring 80 of the bearing 8, and the side surface of the sprocket 9 on the bracket 3 side (the end surface 900 in the embodiment of FIG. The central portion of the surface portion 910 in the embodiment 6) is automatically positioned by bringing it into contact with the second end edge 102 in the length direction of the spacer 10, and in the positioned state, inserting the key 201 into the key groove, By fixing the key 201 with the bolt 202, it is fixed to the extending portion 20A of the shaft 20. At this time, the center of the sprocket 9 is aligned with the center of the switchgear sprocket 51.

A process for attaching the sprocket 9 to the shaft 20 according to this embodiment will be described. The left and right brackets 3 and 4 are fixed to the frame in a protruding manner, and both lengthwise end portions of the winding body 2 are supported between the surface portions 30 and 40 of the left and right brackets 3 and 4. At this time, the shafts 20, 20 at both lengthwise ends of the winding body 2 are rotatably supported by bearings 8 provided on the back surfaces of the surface portions 30, 40. A spacer 10 having a predetermined length L is prepared, and the spacer 10 is fitted onto the outer peripheral surface of the extending portion 20A of the shaft 20 from a direction perpendicular to the axial direction of the extending portion 20A. The spacer 10 attached to the outer peripheral surface of the extending portion 20A is slid toward the bracket 3 side, and the first edge 101 of the peripheral surface portion 100 of the spacer 10 is fixed to the back surface of the surface portion 30 of the bracket 3. 80 is brought into contact with the side part 800 of 80. The second end edge 102 of the spacer 10 with the first end edge 101 in contact with the side surface 800 of the inner ring 80 of the bearing 8 is attached to the side surface of the sprocket 9 on the bracket 3 side (the end surface 900 in the embodiment of FIG. The center portion of the surface portion 910 in the embodiment 6) is brought into contact with the key 201, and at that position, the key 201 is inserted into the key groove 200, and the key 201 is fixed with the bolt 202.

The sprocket 9 may be temporarily attached to the extension part 20A before the spacer 10 is attached to the extension part 20A, or the sprocket 9 may be attached to the extension part 20A after the spacer 10 is attached to the extension part 20A. It's okay. Further, the length L of the spacer 10 is determined so that the core of the sprocket 9 attached using the spacer 10 matches the core of the switchgear sprocket 51 to be used. The timing at which the sprocket 9 is attached is not limited, and may be before or after the sprocket 9 is attached.

We have explained how to attach the sprocket 9 to the shaft 20 using the spacer 9, but in addition to the sprocket 9 which is attached to the shaft 20 in alignment with the switchgear sprocket 51, it is also possible to accurately position and fix the sprocket 9 in the axial direction of the shaft. There are necessary elements. Other embodiments of the present invention will be described with reference to FIGS. 8 and 9. Another embodiment relates to a movable winding mechanism, and the movable winding mechanism includes a winding body that winds and unwinds the shutter curtain, and left and right shafts that rotatably support shafts at both longitudinal ends of the winding body. It has a movable bracket, and left and right fixed brackets that support the left and right movable brackets in a reciprocating manner. For details of the movable winding mechanism, reference can be made to Patent Document 2.

One of the shafts at both lengthwise ends of the winding body is a drive side, and one shaft is rotationally driven by an opening/closing machine. A shaft sprocket is fixed to one of the shafts so that its core coincides with the opening/closing machine sprocket, and the structure of the previously described embodiment can be adopted as the mounting structure of the shaft sprocket.

8 and 9 show the driven side of the movable winding mechanism. A shaft 20' is inserted into the face part 40' of the movable bracket 4', and a bearing 8 is provided on the back side of the face part 40' at the insertion part, and the shaft 20' is rotatably attached to the bracket 4'. Supported. The shaft 20' includes an extending part 20A' extending outside the surface part 40' of the bracket 4.

Cam plates 11 are fixed at positions inside one bracket and outside the other bracket 4' in the longitudinal direction of the winding body. The cam plate 11 has a disk-shaped outer shape, and has a circular opening formed in the center, through which the shaft 20' is inserted, and is fixed to the outer surface of the extending portion 20A' of the shaft 20'. The shaft 20' rotates integrally with the shaft 20'. The center of the cam plate 11 and the center of the shaft 20' coincide. A guide groove (cam groove) 110 is formed in one surface of the disc-shaped cam plate 11 and extends in a spiral shape from the inside (the side closer to the shaft 20') toward the peripheral edge. The radial distance between the center of the cam plate 11 (rotation center of the shaft 20') and the guide groove 110 gradually increases from the inside toward the periphery.

The fixed bracket 12 is provided with a guide protrusion (cam follower) 13 that is located within the guide groove 110 of the cam plate 11 and is movable relatively along the guide groove 110. It is guided by the guide protrusion 13 and moves in the front-back direction. The guide protrusion 13 is fixed to the distal end side of an arm 130 that extends parallel to the surface of the cam plate 11 in which the guide groove 110 is formed, and the proximal end side of the arm 130 is fixed to the fixed bracket 12. The guide protrusion 13 is immovable, and as the cam plate 11 rotates and moves in the front-rear direction relative to the immovable guide protrusion 13, the winding mechanism moves in the front-rear direction. In order for the winding mechanism to move smoothly in the front-back direction, alignment of the guide groove 110 of the cam plate 11 and the guide protrusion 13 is important.

The cam plate 11 is positioned using a spacer 10 attached to the outer circumferential surface of the shaft 20' and fixed to the extending portion 20A'. The first edge 101 of the peripheral surface portion 100 of the spacer 10 is located on the back side of the surface portion 40' of the bracket 4', and the first edge 101 in the length direction is connected to the side surface portion 800 of the inner ring 80 of the bearing 8. (See FIG. 7(A)). 111, the mounting position of the cam plate 11 in the length direction of the extending portion 20A' of the shaft 20' is determined, and the cam plate 11 is fixed to the extending portion 20A'.

2 Winding body 20 Shaft 20' Shaft 20A Extension part 20A' Extension part 3 Bracket 30 Surface part 4 Bracket 40 Surface part 5 Switcher 51 Switcher sprocket 8 Bearing 80 Inner ring 800 Side surface of inner ring 9 Sprocket 90 Boss 900 End surface (element side part on the bracket side)
91 Disk-shaped part 910 Surface part (side surface part on the bracket side of the element)
10 Spacer 100 Surrounding surface portion 101 First edge 102 Second edge 105 Opening 11 Cam plate 110 Cam groove 111 Central portion of the bracket side surface of the cam plate 11 (bracket side side surface of the element)

Claims (10)

A bracket with an insertion part,
a bearing provided on the bracket at the insertion portion;
a shaft that is inserted through the insertion part, is rotatably supported by the bracket by the bearing, and has an extension part located outside the bracket;
A mounting structure for an element that is fixed at a predetermined position in the axial direction of the extending portion of the shaft while being inserted through the extending portion,
A spacer having a peripheral surface portion having a predetermined length and an arc shape in cross section is attached to the outer peripheral surface of the shaft,
A first edge of the spacer in the longitudinal direction is in contact with a side surface of the bearing,
The element is fixed to the extension part with a side surface of the element on the bracket side in contact with a second end edge in the length direction of the spacer.
Mounting structure of the element on the shaft. The bearing is provided on the back side of the bracket,
The peripheral surface portion attached to the outer peripheral surface of the shaft extends from the outer peripheral surface of the extending portion of the shaft to the back side of the bracket through the insertion portion.
A structure for attaching an element to a shaft according to claim 1. A first end edge of the spacer in the longitudinal direction is in contact with a side surface of the inner ring of the bearing.
A structure for attaching an element to a shaft according to any one of claims 1 and 2. The spacer is attached to the outer circumferential surface of the extending portion from a direction perpendicular to the axial direction of the extending portion, such that the opening of the circumferential surface portion having an arc shape in cross section is fitted onto the outer circumferential surface of the extending portion. It is possible,
A structure for attaching an element to a shaft according to any one of claims 1 to 3. A key portion for fixing the element to the extending portion protrudes from the outer peripheral surface of the extending portion of the shaft,
The key portion is located in the opening of the peripheral surface portion of the spacer attached to the extending portion.
A structure for attaching an element to a shaft according to any one of claims 1 to 4. The spacer is movable in the axial direction of the shaft while attached to the outer peripheral surface of the shaft.
A structure for attaching an element to a shaft according to any one of claims 1 to 5. The structure for attaching an element to a shaft according to any one of claims 1 to 6, wherein the element is a sprocket. The structure for attaching an element to a shaft according to any one of claims 1 to 6, wherein the element is a cam plate having a spiral cam groove on its surface. A method of attaching an element to a shaft, the method comprising:
The shaft is inserted through an insertion portion of the bracket and is rotatably supported by a bearing provided on the bracket, and the shaft includes an extension portion located outside the bracket,
The element is adapted to be attached to a predetermined position in the axial direction of the extension part of the shaft while being inserted through the extension part,
preparing a spacer consisting of a circumferential surface portion having a predetermined length and an arc shape in cross section, and having an opening formed in the circumferential surface portion;
fitting the spacer onto the outer circumferential surface of the extending portion from a direction perpendicular to the axial direction of the extending portion so as to receive the extending portion from the opening of the circumferential surface portion;
bringing a first edge of the spacer in the longitudinal direction into contact with a side surface of the bearing;
bringing a bracket-side side surface of the element into contact with a second longitudinal end edge of the spacer;
The element and the extension are connected with the first longitudinal end edge of the spacer in contact with the side surface of the bearing, and the second longitudinal end edge in contact with the bracket-side side surface of the element. fixing the exit part;
the method of attachment of the element to the shaft, including; The element is fixed to the extension using a key, and a key portion for fixing the element to the extension protrudes from an outer peripheral surface of the extension of the shaft. and
The spacer is fitted onto the outer circumferential surface of the extending portion such that the key portion is located in the opening of the circumferential surface of the spacer attached to the extending portion.
A method of attaching an element to a shaft according to claim 9.

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