KR20030051341A - Fixing wheel and removal jig thereof - Google Patents

Abstract

PURPOSE: To provide a snap ring easy to engage with an engaging groove of shaft and besides possessed of high wear resistance and furthermore to provide a fixture for attaching or detaching a snap ring to or from the engaging groove. CONSTITUTION: A length of an internal peripheral edge 11a in an opening porting 11 of the snap ring 1 abutting against a bottom m of the engaging groove M of the shaft S is made not smaller than a half circumferential length of the bottom m of the engaging groove M. Engagement of the snap ring 1 is performed in such a way that a guide portion 14 supports the snap ring 1 by sandwiching the engaging groove M of the shaft S, so that the snap ring is set in the engaging groove M and thereafter a flat receiving portion 15a provided in a protruding portion 15 presses the snap ring 1. At that time, a portion between a slit porting 12 provided in an upper portion of the opening portion 11 and both recess portions 15b provided in the vicinity of the protruding portion 15 is bowed by force transmitted from the flat receiving portion 15a, so that the snap ring 1 engages easily with the shaft S.

Description

Fixed wheel and fixed wheel demounting jig {FIXING WHEEL AND REMOVAL JIG THEREOF}

TECHNICAL FIELD The present invention relates to a fixed wheel demounting jig for exclusive use in which a fixed wheel and a fixed wheel for positioning and detachment fixing in the thrust direction of a rotating shaft or a fixed shaft are engaged with or removed from an engagement groove of an outer diameter of the shaft.

Conventionally, as the structure of the fixed wheel which performs positioning in the thrust direction of an axis by fitting in the engagement groove provided along the circumference of a shaft, regardless of a rotating shaft and a fixed shaft, E-type fixed wheel 50 shown in FIG. Is known. As shown in the figure, the E-shaped fixing wheel 50 has a substantially E-shaped plate-like shape having a substantially circular substantially arc-shaped outer circumference.

As shown by the center dotted line part of FIG. 5, this E-shaped fixed ring 50 latches the inner peripheral edge 51 which is an arc having a diameter substantially the same as the engagement groove bottom m, and a hatching part in the registration groove bottom m. Is attached to the engagement groove M of the shaft S, and the thrust direction is positioned with respect to the apparatus main body side of the shaft S by contacting and engaging. The mounting method of the E-type fixing wheel 50 to the engagement groove M is the E-type fixing shaft 50 while the taper portion 52 is continuously brought into contact with the opening of the fixing wheel 50 to the shaft S. Is pressed by pressing downward in FIG.

Here, the E-type fixed wheel 50 is provided with two concave portions 53 adjacent to the inner circumferential edge 51, and the E-type fixed wheel 50 in contact with the data portion 52 is formed on the shaft S. ) When pressurized to the center, the E-shaped fixing wheel 50 is bent in the vicinity of the concave portion 53, whereby it is deformed and fitted and engaged.

In the conventional E-shaped fixed ring 50, since the entire outer circumferential shape is arcuate, when the user engages in the engagement groove of the shaft and does not use the mounting jig, the user can easily engage in the engagement groove M. There was a problem that no. That is, in a case other than the mounting-only jig, in order to hook the shaft S to the fitting groove M, a mechanism having a flat portion such as, for example, a negative driver is pressed against the outer peripheral surface of the E-type fixing wheel 50. Or when the outer diameter is pushed down with a thin pliers, the mechanism slides on the outer circumferential surface portion of the E-type fixing wheel 50, thereby forcing the E-type fixing wheel 50 to the shaft S. This was often not effectively applied.

In addition, in the case of the E-shaped fixed wheel 50, a function is required even when detaching, and it is not easy because there is damage or deformation.

In addition, when the shaft S is positioned with respect to the apparatus main body B using the E-type fixing wheel 50, the shaft S will be in the state in which the thrust G was applied to the arrow direction in FIG. When it rotates, the contact part (three hatching parts in FIG. 5) with the engagement groove M side of the inner peripheral part 51 vicinity of the E-type fixed ring 50, and the engagement groove M which opposes. Since the pressure slide moves on the side surface of the shaft, the contact portion is partially worn out in accordance with the rotation of the shaft S, and the shaft S and the mechanism main body B are in accordance with the operation of the apparatus provided with the shaft S. There existed a problem that a position shift and a rattling generate | occur | produced in between, and it causes trouble to drive | operate an apparatus.

SUMMARY OF THE INVENTION An object of the present invention is to secure a contact area of a contact portion of a slide moving part in consideration of abrasion resistance as a vibration slide movement device, and to provide a fixed wheel shape capable of efficiently attaching and detaching a shaft into an engaging groove, and the fixed wheel. It is to provide a detachable jig to facilitate mounting or detachment to the engagement groove of the shaft easily.

MEANS TO SOLVE THE PROBLEM In order to solve the said subject, in the invention of Claim 1, in the fixed wheel which mounts to the said rotating groove of a rotating shaft or fixed shaft which has a narrow engaging groove formed along the circumferential direction of an axis, the said fixed wheel is approximately looped. A plate-shaped member having a cutout portion formed in communication with the opening portion extending from the center to the circumferential direction so as to form a part of the shape in a substantially circular arc shape having a circular opening at the center cut out, and open the substantially arc-shaped shape in one direction. The inner diameter of the center of the substantially annular opening center of the inner circumferential edge of the plate-like member is substantially the same as the groove bottom diameter in the engagement groove of the shaft, and the two of the inner circumferential sides of the plate-shaped member which face each other by sandwiching the cutouts. The distance between the narrow end portions at the engaging groove bottom of the shaft on the opening side The insertion taper part of which the radially outer edge of the edge part of the said plate-shaped member was tapered was provided in a part of the said plate-shaped member so that it might become narrower than the diameter and widen as the said distance goes toward the outer peripheral side. A slit portion which is located at the inner circumferential edge of the shape member and is concavely recessed toward the outer circumferential side along the radial direction of the opening is provided on the centerline along the central radial direction of the opening from the center position of the cutout. The outer circumferential edge of the shape member in the vicinity of the slit portion is the bearing portion of the T-shaped tip formed with a substantially linear protrusion of the protrusion end orthogonal to the center line, and the inner circumferential edge of the plate-shaped member is the engaging groove bottom of the shaft. Said fastening, over at least a half of the circumference of the And in that a fixed wheel matchuge freely walking.

According to the invention of claim 1, the opening contacting the bottom of the engaging groove provided along the circumference of the shaft has a contact length of at least one half of the circumference of the engaging groove bottom, and thus compared with the conventional E-type fixed wheel. The real area in contact with the engagement groove side increases. For this reason, when the thrust force is applied to the fixed wheel as described above, the thrust load per unit area applied to the vicinity of the opening portion is reduced. Therefore, it is possible to disperse and reduce wear due to the slide movement near the inner circumferential surface, and to extend the life of the bearing portion of the fixed wheel. Therefore, in the apparatus etc. which have a shaft structure with a fixed wheel, the positional relationship of an axis | shaft and an apparatus main body can be optimally maintained over a long driving time.

Moreover, by providing the fixed wheel with the taper part which continues from a guide part, and the slit part which opposes the area | region fitted in the taper part, the fixed wheel can be easily hooked and fitted in a fitting groove. That is, by applying the pressing force in the direction from the slit portion in the radial direction of the opening to the cutout portion with respect to the fixed wheel in a state where the bottom of the engaging groove is brought into contact with the guide portion and the tapered portion by engaging the fixed wheel. The part near the part is bent. The tapered portion is opened by bending the portion near the slit portion of the fixed wheel, and the fixed wheel can be hooked to easily fit the engaging groove.

In addition, by providing a bearing part in the fixed wheel, the fixed wheel can be more easily hooked to fit the fitting groove. That is, when the fixed wheel is pressurized in the radial direction of the opening in the state where the fixed wheel is engaged by the tapered portion, the force is applied to the bearing portion of the fixed wheel by using a mechanism having a bearing portion such as a negative driver, for example. The mechanism can bend the portion near the slit portion effectively without slipping the outer peripheral portion of the fixed wheel. Therefore, even if a dedicated jig is not used, the fixed wheel can be efficiently hooked to the fitting groove.

Moreover, in invention of Claim 2, in the fixed wheel of Claim 1, the width | variety of the part along the radial direction of the said opening part of the left-right vicinity part of the said slit part is the width of the whole along the radial direction of the said opening part of the said plate-shaped member. I assume a fixed wheel becoming narrower.

According to the invention as set forth in claim 2, the fixed wheel has a shape in which the annular width becomes thinner in the vicinity of the slit portion. Therefore, when the fixed wheel is hooked on the tapered portion to be brought into contact with the fitting groove, and a force is applied from the bearing portion along the radial direction of the opening portion, the fixed wheel can be easily bent at the tapered portion, and the width of the cutout portion can be widened. Therefore, the fixed wheel can be more easily hooked to fit the groove.

Moreover, in invention of Claim 3, in the fixed wheel of Claim 1 or 2, it opposes the inner peripheral edge side of the tip rather than the said taper part of the radially outer side which follows the two ends which fit the said notch part of the said plate-shaped member. The distance between the leading edges is at least about the same distance as the diameter at the bottom of the engagement groove of the shaft, and is shorter than the diameter of the outside of the engagement groove of the shaft, and the opposing leading edge is slit from the center of the cutout. It is set as the fixed wheel which has the guide part for introduction which became substantially parallel with the center line along the radial direction which reaches the part center.

According to the invention as set forth in claim 3, in order to align the fixed wheel with the engagement groove of the shaft, when the fixed wheel is applied with the bearing portion in contact with the engagement groove by the tapered portion, the fixed wheel is moved by the guide portion. It takes the form of pinching the part of the engagement groove of the shaft. Therefore, when the force is applied from the bearing portion to the fixed wheel, the fixed wheel can fall down and fall from the engagement groove, and it can be reliably and efficiently fitted to the shaft.

Moreover, in invention of Claim 4, in the fixed wheel of Claim 3, it protrudes outward along the outer peripheral edge radial direction of the said substantially annular part in the circumferential direction outer side on the centerline of the said slit part provided in the inner peripheral edge of the said plate-shaped member. A protruding portion having a substantially T-shape is provided, and the tip portion of the protruding portion becomes a bearing portion, and the width of the raised portion of the plate-shaped member extending in the center direction from the bearing portion of the left and right edge portions of the protruding portion extends from the bearing portion of the protruding portion. It is set as the fixed wheel in which the recessed part is formed in the edge part of the left and right of the center line of the said projection part so that it may become narrower than the bearing part width | variety of the said.

According to the invention as set forth in claim 4, the fixed wheel has a projecting portion projecting outward in the radial direction of the opening at a position where the slit portion and the plate-like member are sandwiched. In addition, the protruding portion has a bearing portion at the tip, and has a tapered substantially T-shaped shape at a portion near the slit portion in which the center is inclined from the bearing portion. Therefore, when the fixed wheel is hooked on the tapered portion to be brought into contact with the alignment groove, when the force is applied at the bearing portion, the tapered portion is bent so that the fixed wheel can be easily hooked on the alignment groove.

In addition, by forming the protrusion as described above, a jig for easily engaging the fixed wheel with the engaging groove or detaching from the engaging groove can be easily created.

Moreover, in invention of Claim 5, in the fixed wheel detachment jig for attaching and detaching the fixed wheel of Claim 4 to the part of the engagement groove | channel of the said shaft, a jig consists of a plate-shaped member, The engagement notch which has a similar shape substantially the same as the outer peripheral edge of the said fixation wheel from the said bearing part of the said fixed wheel to the said recessed part is installed in the state opened, and the one end part of the said plate-shaped member is engaged The split slit, which is elastically deformable, is formed as a fixed wheel attachment / detachment jig which is formed upward toward the center of the cutout portion so as to be pushed to the left and right at the portion of the binding portion.

According to the invention as set forth in claim 5, when the fixed wheel is hooked to the engaging groove, the engaging cutout of the fixed wheel detachment jig can be held in a state of being fitted to the outer peripheral edge from the bearing portion of the fixed wheel to the recess. When it is mounted in the fitting groove, the fixing wheel can be easily hung on the fitting groove by applying a force to the bearing portion from the fixing wheel detachable jig.

In addition, when the fixed wheel is detached from the engaging groove, a tension force is applied in the direction of detachment from the shaft in a state where the engaging notch of the fixed wheel detachment jig is engaged with the outer peripheral edge from the bearing portion of the fixed wheel to the recess. By doing so, the fixed wheel can be easily engaged and removed from the alignment groove. That is, the fixed wheel and the fixed wheel demounting jig are engaged and held in an approximately T-shaped portion of the protrusion, and when the tensile force is applied in the direction of disengaging the fixed wheel from the engaging groove, the tensile force is efficiently transmitted to this portion. . Therefore, the fixed wheel can be reliably and efficiently removed from the alignment groove.

In addition, in order to engage and lock the fixed wheel to the engaging groove, when engaging the fixed wheel demounting jig to the fixed wheel which fixed the fixed wheel demounting jig, the engaging notch of the fixed wheel demounting jig is brought into contact with the bearing of the fixed wheel, and the fixed wheel demounting jig This can be done easily by pressing the jig in the direction from the side toward the fixed wheel. At this time, the vicinity of the slit portion of the fixed wheel demounting jig is bent, so that the fitting of the fixed wheel demounting jig to the fixed wheel projecting portion can be simplified, and the engagement and maintenance are easy. Therefore, the operation such as engaging the fixed wheel to the alignment groove or removing the fixed wheel from the alignment groove can be performed with one jig, and handling becomes easy.

1 is a front schematic view showing a relationship between a fixed wheel and an axis according to the present invention;

2 is a front schematic view showing a relationship between a fixed wheel and a fixed wheel detachable jig according to the present invention;

3 is a front view of a fixing wheel according to another embodiment of the present invention,

4 is a front view of a fixing wheel according to another embodiment of the present invention,

5 is a front schematic view showing a relationship between a conventional E-type fixed wheel and an axis;

Fig. 6 is a partial side cross-sectional schematic diagram showing a state where the shaft S is positioned using a conventional E-type fixed wheel or the fixed wheel according to the present invention.

<Description of the symbols for the main parts of the drawings>

1: fixed wheel 2: fixed wheel detachable jig

5: E type fixed wheel 10: Notch

11 opening 12 slit

13 taper portion 14 guide portion

15: protrusion 15a: bearing

15b: recess 31: walk guide portion

32: slot

EMBODIMENT OF THE INVENTION Hereinafter, the fixed wheel 1 which concerns on this invention is demonstrated with reference to drawings. The fixed wheel 1 is a plate-shaped member processed, for example, by drilling the flat plate of SK5 steel (carbon steel for tools) which has a fixed thickness, for example. As shown in FIG. 1, the fixed wheel 1 has a substantially annular member having an almost circular diameter opening 11 inside the center of the cutout portion 10 from the opening 11 to the outside (outer peripheral side). ) Has a shape formed in an arc shape of approximately C shape. Moreover, the fixed wheel 1 whole is comprised by the slit part 12, the taper part 13, the guide part 14, the protrusion part 15, etc. other than the said notch 10 and the opening part 11, and is comprised have.

The opening 11 forms the inner circumferential side of the fixed wheel 1 having an almost annular shape, and when the fixed wheel 1 is engaged with the engagement groove M of the axis S indicated as an imaginary line. , The bottom portion m of the engagement groove M provided on the circumference of the side surface of the shaft S is in contact with the inner circumferential edge 11 a. The inner circumferential edge 11a is a circular arc having an inner diameter approximately equal to the diameter of the bottom m of the engagement groove M, and has a circumferential length of at least one half the circumference of the bottom of the engagement groove M. FIG. The notch 10 has a shape in which the opening 11 communicates with the outside of the fixed wheel 1.

The slit portion 12 is provided to face the cutout portion 10 at the center of the shaft. The slit part 12 passes through the center of the notch 10 and the opening 11 at the point where the center line C along the radial direction of the circular arc forming the inner circumferential edge 11a and the inner circumferential edge 11a intersect. It has a concave shape cut | disconnected in the said radial direction toward the outer peripheral part of the fixed wheel 1.

The taper part 13 is formed in the part of the opening part 11 side of the two front-end | tip edges F which oppose the cutout part 10 of the plate-shaped member which comprises the fixed wheel 1. Tapered part 13 The distance between the two opposing edges which sandwiches the notch 10 on the inner peripheral edge 11a side is narrower than the diameter of the circular arc which comprises the inner peripheral edge 11a, and is continuously said tip edge F as it goes to the outer peripheral part side. It is formed in the shape of approximately H shape which the space | interval of () becomes wide. The space | interval at the outer peripheral part side edge part of the taper part 13 is about the same length as the diameter of the bottom part m of the engagement groove M. As shown in FIG.

The guide part 14 is formed in the part of the inner peripheral part side of the said leading edge F. As shown in FIG. The portion constituting the guide portion 14 is formed parallel to the central axis (C), the interval between the portions is a length close to the diameter of the bottom (m) of the engagement groove (M) in the axis (S) Is desirable to hook up.

The protruding portion 15 is provided at the outer circumferential side of the slit portion 12 of the fixed wheel 1, and eventually at the outer position opposite to the plate-shaped member, and along the center line C to the shaft object, that is, the opening 11. The tapered part 13 and the guide part 14 are projected on the opposite side to the center, and the protrusion part 15 is provided with the bearing part 15a, and the both sides are provided with the recessed part 15b.

At the distal end of the protruding portion 15, a bearing portion 15a formed in a substantially straight line perpendicular to the center line C is provided. In addition, a portion inclined to the center of the side edge portion of the protruding portion 15 from the bearing portion 15a, that is, the bottom portion of the protruding portion 15, has a width corresponding to the width of the bearing portion ( It is narrower than the width in 15a). That is, this part has a shape tapered to the left and right, and forms the recessed part 15b. The protruding portion 15 has an approximately T-shape by providing the bearing portion 15a and the concave portion 15.

The outer circumferential portion of the fixed wheel 1 has a concave shape in the vicinity of the tip portion F forming the guide portion 14 serving as the introduction portion of the shaft S and the outer circumferential portion between the protrusions 15. have. That is, the width | variety of the circumferential direction of the plate-shaped member which comprises the fixed wheel 1 is the width | variety until it reaches the part near the front-end | tip edge F which comprises the guide part 14 in the left and right vicinity of the slit part 12. It is narrower than this wide part.

Thus, by narrowing the width along the radial direction of the opening part 11 only in the left and right vicinity of the slit part 12, the fixed wheel 1 can be efficiently hooked and fitted to the fitting groove M, In the state where the fixed wheel 1 is engaged with the engagement groove M, the strength of the fixed wheel 1 so that the fixed wheel 1 does not fall from the engagement groove M during rotation of the shaft S is fixed. Can be given to

Next, the engagement with the engagement groove M of the shaft S of the fixed wheel 1 which concerns on this invention is described.

First, the fixed wheel 1 is installed to guide the bottom portion m of the engagement groove M of the shaft S in the guide portion 14. Subsequently, the bearing portion 15a of the guide portion 15 is pressed in the direction of the axis S center with a tool such as a driver having a flat portion. The force for pressing the bearing portion 15a is transmitted from the tapered portion 13 to the portion between the slit portion 12 and the recessed portion 15b, and by this force, between the slit portion 12 and the recessed portion 15b. The left and right H portions of the are bent. In this way, the width | variety of the notch 10 of the opening part 11 becomes wide, and the space | interval of the opening side edge part of the taper part 13 of the bottom part m of the engagement groove M in the axis | shaft S is made. By opening larger than the diameter, it becomes possible to engage the fixed wheel 1 and fit into the fitting groove M. As shown in FIG. Then, it is fixed by pressing the projection part 15 side toward the axis S center direction until the inner peripheral edge 11a of the opening part 11 contacts the bottom part m of the engagement groove M of the shaft S. The engagement of the wheel 1 and the shaft S is completed.

As shown in FIG. 1, the inner peripheral edge 11a of the fixed wheel 1 which concerns on this invention has the circumferential length of one half or more of the circumference of the bottom m of the engagement groove M. As shown in FIG. Therefore, the fixed wheel 1 fitted into the engagement groove M has a side portion (hatching part) up to the bottom m of the engagement groove M as compared with the conventional E-type fixed wheel 50. , The contact is made in a larger contact area. Specifically, for example, the fixed wheel 1 and the conventional E-shaped fixed wheel 50 have a named dimension of 1.2 mm, an outer diameter of the shaft S of 1.5 mm, and an inner circumferential edge 11a of the fixed wheel 1. In the case where the length of φ is two-thirds of the circumference of the bottom of the engagement groove M, the contact area between the fixed wheel 1 and the engagement groove M is a conventional E-type fixed wheel 50. ) Is approximately 1.5 times the contact area of the engagement groove M.

As shown in FIG. 6, when the shaft S is rotated in the state where the thrust G is applied in the direction of the arrow as shown in FIG. 6, the contact area with the engagement groove M is increased. The force per unit area applied to the portion in contact with the side surface portion of the engagement groove M of is smaller than in the case of the conventional E-type fixed wheel 50. Thereby, the fixed wheel 1 becomes difficult to wear at the time of the slide movement by rotation of the shaft S. FIG. Thereby, the fixed wheel 1 which concerns on this invention has high wearability, and its life becomes long. Therefore, the positional relationship of the shaft S and the mechanism main body B can be optimally maintained over a long operation time.

Moreover, by providing the bearing part 15a which has the form of the straight line orthogonal to the center axis C, the fixed wheel 1 can be efficiently hooked and fitted to the engagement groove | channel M. As shown in FIG. That is, when pressing force is applied to the bearing part 15a through a tool, since the said tool is prevented from slipping off the outer peripheral edge of the fixed wheel 1, the taper of the fixed wheel 1 is not required even if a dedicated jig is not used. The force can be effectively applied to the part 13.

Moreover, by making the width | variety of the radial direction in the left-right vicinity of the slit part 12 of the plate-shaped member which comprises the fixed wheel 1 narrower than the said width in the opening part 11, and providing the recessed part 15b, The plate-like member constituting the fixed ring 1 is narrowed at the periphery of the slit portion 12. Therefore, when the bearing part 15a is pressurized, the said peripheral part can be easily bent and the taper part 13 can be opened gradually. Therefore, it is possible to reliably and efficiently fasten the fixed wheel 1 to fit in the fitting groove M.

In addition, when performing the engagement operation of the fixed wheel 1, the fixed wheel 1 is provided in the form which clamped the engagement groove | channel M in the guide part 14. As shown in FIG. Since the fixed wheel 1 is temporarily supported by the shaft S by the guide part 14 clamping the engagement groove M, when the bearing part 15a is pressed, the fixed wheel 1 ) Or falling) is prevented. Therefore, since the fixed wheel 1 can be pressurized more effectively, the efficiency at the time of hooking the fixed wheel 1 to the fitting groove M is improved further.

Next, the fixed wheel mounting jig 3 for engaging the fixed wheel 1 which concerns on this invention to the engagement groove M of the shaft S is demonstrated. The fixed wheel demounting jig 3 is a plate-shaped member formed by drilling a flat plate of SK5 steel (carbon steel for tool) having a constant thickness, for example, in a substantially rectangular shape as shown in FIG. 31 and the slot 32 is formed.

The engagement guide portion 31 has a shape substantially the same as the portion that extends from the bearing portion 15a of the protruding portion 15 of the fixed wheel 1 to the recessed portion 15b or the outer peripheral edge of the proximal portion 15. 6 is provided in an open form below the shaft of the side cross section in FIG. The engagement guide part 31 is engaged with the protrusion part 15 and the vicinity of the protrusion part 15 like FIG. Moreover, the slot part 32 is provided in the form which cuts toward the upper side in FIG. 2 in the form orthogonal to the said part from the part which communicates with the bearing part 15a of the engagement guide part 31. As shown in FIG.

The fastening of the fixed wheel 1 using the fixed wheel detachable jig 3 to the engaging groove M is fixed wheel detachable jig in a state where the engaging groove M is sandwiched by the guide portion 14. After engaging the engaging guide part 31 of (3) in the vicinity of the protrusion part 15 and the protrusion part 15 of the fixed wheel 1, by pressing the bearing part 15a through the fixed wheel detachment jig 3, I can do it.

Moreover, when removing the fixed wheel 1 from the shaft S for maintenance of the mechanical apparatus provided with the shaft S, etc., the engagement guide part 31 of the fixed wheel detachable jig 3 is removed. After engaging the protrusion 15 of the fixed wheel 1, the recessed part of the protrusion part 15, etc., it can carry out by tensioning the fixed wheel mounting jig 3 to the extraction direction of the center axis C direction.

When the fixed wheel 1 is tensioned as described above, the tension force is first applied to both ends of the opening 11 side of the tapered portion 13 through the protrusion 15 and to the vicinity of the slit portion 12. Delivered. Moreover, since the vicinity of the slit part 12 is bent and the width | variety of the taper part 13 becomes wide, the fixed wheel 1 can be hooked and can be removed from the fitting groove M. As shown in FIG.

Here, the protrusion part 15 of the fixed wheel 1 is provided with the recessed parts 15b-15b of both sides, and the engagement guide part 31 of the fixed wheel detachment jig 3 hangs with this part. It is being adjusted. Therefore, when the fixed wheel detachable jig 3 is fixed to the fixed wheel 1, when the fixed wheel detachable jig 3 is hooked and tensioned in the direction of removing the fixed wheel 1 from the alignment groove M, The fixed-wheel demounting jig 3 does not fall from the fixed-wheel 1, and a tension force is transmitted to the said recessed part 15b-15b from the part which contacts the recessed part 15b-15b of the fitting guide part 31. do. By the tension force transmitted in this way, the part near the slit part 12 of the fixed wheel 1 is bent, and it can reliably and efficiently fix the fixed wheel 1, and can remove it from the fitting groove M. As shown in FIG.

The fastening of the fixed wheel 1 and the fixed wheel detachable jig 3 may be performed by sliding the fixed wheel detachable jig 3 in the axial direction of the axis S with respect to the fixed wheel 1. After contacting the protruding portion 15 of the fixed wheel 1 with the engagement guide portion 31 of the fixed wheel detachable jig 3, the fixed wheel detachable jig 3 is pressed by pressing in the direction of the fixed wheel 1. You can walk along. When pressing the fixed wheel demounting jig 3 in the fixed wheel 1 direction, the entire slot portion 32 of the fixed wheel demounting jig 3 is bent wide in the width direction W of the slot to easily attach and detach the fixed wheel. The jig 3 can be hooked onto the fixed wheel 1.

By using the fixed wheel demounting jig 3, when the fixed wheel 1 is attached and detached to the engagement groove M, it is possible to effectively apply a pressing force or a tensile force to the fixed wheel 1. Therefore, the operation | work which engages the fixed wheel 1 to the shaft S, or removes it from the shaft S can be performed efficiently and efficiently.

Moreover, by providing the slot part 32 in the fixed wheel demounting jig 3, when attaching and detaching the fixed wheel 1 to the fitting groove M, the fixed wheel demounting jig 3 is attached to the fixed wheel 1. Can be easily hooked up Therefore, it is possible to reliably and efficiently perform the operation of engaging the fixed wheel 1 to the engaging groove M of the shaft S or removing the fixed wheel 1 from the engaging groove M. .

Further, the spacing of the leading edge FF of the fixed wheel 1 constituting the guide portion 14 is preferably almost equal to the diameter of the bottom m in the engagement groove M of the shaft S, It is not limited to it. When the fixed wheel 1 is effectively supported by the shaft S when performing the fastening operation of the fixed wheel 1 to the engagement groove M, the tip edge of the fixed wheel 1 ( The interval of FF may be longer than the diameter in the engagement groove M of the shaft S, and may be shorter than the outer diameter of the shaft S. FIG.

In addition, the material of the fixed wheel 1 and the fixed wheel detachable jig 3 which concerns on this invention is not limited to SK5 steel as mentioned above. As long as it is a material having wear resistance and toughness, the fixed wheel 1 and the fixed wheel detachable jig 3 may be formed of SKS steel, or may be formed of SUS steel, for example.

Moreover, the form of the fixed wheel 1 which concerns on this invention is not limited to the thing of the shape mentioned above. For example, as shown in FIG. 3, the fixed wheel 1 may be made into the form which abbreviate | omitted the guide part 14 substantially. In addition, the fixed wheel 1 can be easily hooked to the alignment groove M, and the fixed wheel 1 is fixed to the engagement groove M while being fixed to the engagement groove M. If the fixed wheel 1 has the strength that the wheel 1 falls from the engagement groove M, as shown in FIG. 4, the guide part 14 from the left and right ends of the protrusion part 15, for example. The width in the radial direction of the opening part 11 in the plate-shaped member until reaching the front end part which forms () may be formed uniformly.

According to the invention described in claim 1, the wear caused by the slide movement near the inner circumferential surface can be reduced, and the life of the shaft of the fixed wheel can be increased. Therefore, there is no rattling over a long operation time of the mechanical device with a shaft, and it is possible to optimally maintain the positional relationship between the shaft and the device body.

In addition, the fixed wheels are easily engaged with the fixed grooves by applying a pressing force in the direction from the slit portion in the radial direction of the opening toward the cutout portion while the fixed wheels are in contact with the bottom portion of the alignment grooves and the tapered portion. I can walk.

In addition, the bearing part is provided in the fixed wheel so that the bearing part of the fixed wheel has a bearing part such as, for example, a negative driver when the fixed wheel is pressed in the radial direction of the opening in the state where the fixed wheel is brought into contact with the fitting groove in the tapered part. When a force is applied using the mechanism, the mechanism can reliably and efficiently engage the fixed wheel and fit the fitting groove without slipping the outer peripheral portion of the fixed wheel.

According to the invention described in claim 2, the fixed wheel has a tapered shape in the vicinity of the slit portion, whereby the fixed wheel can be easily bent at the tapered portion, and the fixed wheel can be easily hooked to fit the groove.

According to the invention described in Claim 3, when the bearing wheel is applied to the bearing groove while the fixed wheel is engaged by the tapered portion, the fixed wheel is supported by the shaft in a temporary state in the form of sandwiching the shaft in the guide portion. Therefore, when the force is applied from the bearing portion to the fixed wheel, the fixed wheel can fall over and fall off from the engaging groove, and it can be reliably and efficiently fitted to the shaft.

According to the invention of claim 4, when a force is applied to the bearing portion, the tapered portion is bent in the vicinity of the slit portion of the protruding portion, so that the fixed wheel can be easily hooked to the fitting groove and the fixed wheel can be efficiently The jig for making it easy to fit in a fitting groove or removing from a fitting groove can be easily created.

Moreover, according to invention of Claim 5, the operation | work which hangs a fixed wheel to an engaging groove, or removes from a fixed wheel and an engaging groove becomes easier.

Claims (5)

A fixed wheel for mounting to said engaging groove of a fixed shaft or a rotating shaft having a narrow engaging groove formed along the circumferential direction of the shaft, The fixed wheel is formed in a substantially arc shape having a circular opening at the center of which a portion of the annular shape is cut off, and is provided in communication with the opening extending in the circumferential direction from the center to open a substantially arc shape in one direction. It is a plate-shaped member which has a connection, The inner diameter of the center of the substantially annular opening center of the inner circumferential edge of the plate member is approximately equal to the groove bottom diameter in the engagement groove of the shaft, As the distance between two narrow end portions on the inner peripheral side of the plate member sandwiched by the cutouts is narrower than the diameter at the engaging groove bottom of the shaft on the opening side, and the distance is directed toward the outer peripheral side. In order to widen, the insertion taper part which tapered the radial direction outer edge of the edge part of the said plate-shaped member is provided in a part of the said plate-shaped member, Furthermore, a slit portion which is located at the inner circumferential edge of the plate-shaped member and is concavely recessed toward the outer circumferential side along the radial direction of the opening is provided on the center line along the central radial direction of the opening from the central position of the cutout. Moreover, the bearing part of the T-shaped front-end which the protrusion end which the outer peripheral edge of the said plate-shaped member near the said slit part is orthogonal with respect to the said center line is formed in substantially linear form, And the inner circumferential edge of the plate member is freely engaged with the engagement groove over at least a half of the circumference of the engagement groove bottom of the shaft. The method of claim 1, The width of a part along the radial direction of the said opening part of the left-right vicinity part of the said slit part is narrower than the whole width along the radial direction of the said opening part of the said plate-shaped member. The method according to claim 1 or 2, The distance between the leading edges opposed to the inner peripheral edge side of the tip from the taper portion outside the radial direction that is subsequent to the two ends sandwiching the cutout portions of the plate-like member is about the same distance as the diameter at the engagement groove bottom of the shaft. Above and shorter than the outside diameter of the engagement groove of the shaft, And the opposing leading edge portion is an introduction guide portion substantially parallel to a center line along the radial direction from the center portion of the cutout portion to the center of the slit portion. The method of claim 3, An approximately T-shaped protrusion protruding outward along the outer circumferential edge radial direction of the annular portion is provided on the circumferential outer side of the slit portion provided on the inner circumferential edge of the plate-shaped member, and the tip portion of the protrusion is bearing. And the edge portions of the left and right edges of the protrusions such that the widths of the raised portions of the plate-shaped member extending in the center direction from the bearing portions of the protrusions are narrower than the widths of the bearing portions in the bearing portions of the protrusions. A fixed wheel, characterized in that the recess is formed. A fixed wheel demounting jig for attaching and detaching a fixed wheel according to claim 4 to a part of an engagement groove of the shaft, The engagement cutout part which consists of a plate-shaped member and has a similar shape substantially the same as the outer peripheral edge of the said fixed wheel from the said bearing part of the said fixed wheel to the said recessed part at one end part of the said plate-shaped member is opened. Installed with, Furthermore, the fixed-wheel attachment / detachment jig characterized by the fact that the split slit which enables elastic deformation is formed so that one end part of the said plate-shaped member may slide to the left and right at the part of the engagement notch part toward the upper part of the center part of the notch part. .