JP2003184841A - Snap ring and fixture for attaching or detaching snap ring - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: 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. <P>SOLUTION: 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. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a retaining ring for positioning and retaining a rotary shaft or a fixed shaft in the thrust direction, and a dedicated retaining ring for engaging or disengaging the retaining ring with an engaging groove of the shaft outer diameter. Retaining ring attachment / detachment jig.

[0002]

2. Description of the Related Art Conventionally, as a structure of a retaining ring for positioning a shaft in the thrust direction by fitting it into an engaging groove provided along the circumference of the shaft regardless of whether it is a rotating shaft or a fixed shaft,
For example, an E-shaped retaining ring 50 shown in FIG. 5 is known. As shown in the drawing, the E-shaped retaining ring 50 has a substantially E-shaped plate shape having a substantially circular arc-shaped outer periphery.

This E-shaped retaining ring 50 has an inner peripheral edge 51, which is an arc having substantially the same diameter as the engaging groove bottom portion m, as shown by the central chain line in FIG. Are brought into contact with each other to be fitted and engaged with each other, so that the shaft is attached to the engagement groove M of the shaft S, and the shaft S is positioned in the thrust direction with respect to the apparatus main body side. The E-type retaining ring 50 is attached to the engaging groove M by pushing the E-type retaining ring 50 downward in FIG. 5 while bringing the tapered portion 52 following the opening of the retaining ring 50 into contact with the shaft S. Done in.

Here, the E-shaped retaining ring 50 is provided with two concave portions 53 adjacent to the inner peripheral edge 51, and when the E-shaped retaining ring 50 abutted by the tapered portion 52 is pushed into the center of the axis S. , E type snap ring 5
When 0 bends near the concave portion 53, it is deformed and a fitting engagement is performed.

[0005]

In the conventional E-shaped snap ring 50, since the entire outer peripheral shape is an arc shape, it is easy to fit and engage with the engagement groove of the shaft without using a jig dedicated for mounting. There is a problem that it cannot be engaged with the engagement groove M. That is, in the case of a jig other than the dedicated mounting jig, in order to engage the shaft S with the engagement groove M, for example, an instrument having a flat surface such as a flat-blade screwdriver is pressed against the outer peripheral surface of the E-shaped retaining ring 50, or tapered pliers are used. When attempting to attach by holding down the outer diameter with, the device may slip on the outer peripheral surface of the E-shaped retaining ring 50, and the force for pushing the E-shaped retaining ring 50 into the shaft S may not be effectively applied. There were many. Furthermore, in the case of the E-type retaining ring 50, skill was required even when removing it, and it was never easy because it was damaged or deformed.

Further, the shaft S is attached to the main body of the apparatus by using the E-shaped retaining ring 50
When the shaft S is rotated with the thrust G applied in the direction of the arrow in FIG.
The engaging portion M of the 50 near the inner peripheral portion 51 with the side surface of the engaging groove M (three hatched portions in FIG. 5) and the engaging groove M facing each other.
Since the side surface of the shaft S slides by pressure, the abutting portion is partially worn with the rotation of the shaft S, and the shaft S and the instrument body B are operated with the operation of the device including the shaft S. There was a problem in that the operation of the device was hindered due to misalignment and play between the and.

The object of the present invention is to secure the contact area of the abutting portion of the sliding portion and efficiently attach / detach the shaft to / from the engaging groove in consideration of the wear resistance of the vibration / sliding device. (EN) Provided is a retaining ring shape that can be performed, and an attachment / detachment jig that facilitates attachment / detachment of the retaining ring to / from an engaging groove of a shaft.

[0008]

In order to solve the above problems, in the invention according to claim 1, the rotary shaft or the fixed shaft is provided with a narrow engaging groove formed along the circumferential direction of the shaft. In the retaining ring to be mounted in the engagement groove, the retaining ring is formed in a substantially arc shape having a circular opening at the center of a notched part of a substantially annular shape, and is opened in one direction in a substantially arc shape. A plate-shaped member having a notch provided in communication with the opening extending from the center to the outer peripheral direction, wherein the inner diameter of the center of the substantially annular opening of the inner peripheral edge of the plate-shaped member is in the engagement groove of the shaft. The distance between the two narrow ends on the inner peripheral side of the plate-shaped member, which are approximately equal to the diameter of the groove bottom and are arranged to face each other across the cutout, is determined by the bottom of the engaging groove of the shaft on the opening side. The diameter is narrower than the diameter, and the distance becomes wider toward the outer circumference. As described above, an insertion taper portion in which the radially outer side edge of the end portion of the plate-shaped member is tapered is provided in a part of the plate-shaped member, and is located at the inner peripheral edge of the plate-shaped member. A slit portion that is recessed toward the outer peripheral side along the radial direction of the opening is provided on the center line along the radial direction of the center of the opening from the center position of the notch, and in addition, the slit of the plate-shaped member An outer peripheral edge in the vicinity of the slit portion is a flat receiving portion of a T-shaped tip in which a projecting end orthogonal to the center line is formed in a substantially linear shape, and an inner peripheral edge of the plate-shaped member is formed of the shaft. The retaining ring is configured to be engageable with the engagement groove over at least a half of the circumference of the bottom of the engagement groove.

According to the first aspect of the invention, the opening portion that abuts the bottom portion of the engaging groove provided along the circumference of the shaft is
Since the contact length of the engagement groove bottom portion is ½ or more of the circumference, the substantial area of contact with the side surface of the engagement groove is increased as compared with the conventional E-shaped snap ring. Therefore, when a thrust force is applied to the retaining ring as described above, the thrust load per unit area applied to the portion near the opening is reduced. Therefore, abrasion due to sliding of the portion near the inner peripheral surface can be dispersed and reduced, and the life of the bearing portion of the retaining ring can be extended. Therefore, in a device having a shaft structure with a retaining ring attached, the positional relationship between the shaft and the device body can be optimally maintained over a long operating time.

Further, the retaining ring can be easily engaged with the engaging groove by providing the retaining ring with the tapered portion continuing from the guide portion and the slit portion opposed to the region sandwiched by the tapered portions. That is, with the retaining ring in contact with the bottom of the engaging groove at the guide portion and the tapered portion, a pressing force is applied to the retaining ring in the radial direction of the opening, from the slit portion to the notch. By hanging it, the portion near the slit portion of the retaining ring bends. The tapered portion is opened by bending the portion of the retaining ring near the slit portion, and the retaining ring can be easily engaged with the engagement groove.

In addition to this, by providing the retaining ring with the flat receiving portion, the retaining ring can be more easily engaged with the engaging groove. That is, when pressing the retaining ring in the radial direction of the opening with the tapered portion in contact with the engagement groove, force is applied by using a device having a flat portion such as a flat-blade screwdriver in the flat receiving portion of the retaining ring. If the tool is applied, the device can effectively bend the portion near the slit portion without slipping on the outer peripheral portion of the retaining ring. Therefore, the retaining ring can be efficiently engaged with the engagement groove without using a dedicated jig.

In the invention described in claim 2, claim 1
In the retaining ring described above, a part of the width of the opening in the vicinity of the left and right of the slit portion along the radial direction of the opening is narrower than the entire width of the plate member along the radial direction of the opening. It is used as a retaining ring.

According to the second aspect of the invention, the retaining ring has a shape in which a substantially annular width is narrowed near the slit portion. Therefore, the retaining ring is brought into contact with the engagement groove at the tapered portion,
When a force is applied from the flat receiving portion along the radial direction of the opening, the retaining ring is easily bent at the constricted portion, and the width of the notch can be widened. Therefore, the retaining ring can be more easily engaged with the engagement groove.

According to the invention described in claim 3, claim 1
Alternatively, in the retaining ring according to 2, the distance between the leading edge edges facing each other is on an inner peripheral edge side of the plate-shaped member, which is continuous with two end portions sandwiching the cutout portion, and is radially outward and further than the tapered portion. A distance equal to or larger than the diameter of the engaging groove bottom portion of the shaft, and shorter than the outside diameter of the engaging groove of the shaft, and
The retaining ring has a guide portion for introduction in which the opposed leading edges are substantially parallel to a center line along the radial direction from the central portion of the cutout portion to the center of the slit portion.

According to the third aspect of the present invention, since the retaining ring is engaged with the engaging groove of the shaft, the retaining ring is pressed against the flat receiving portion with the tapered portion abutting against the engaging groove. When hooking, the retaining ring takes a form in which the engaging portion of the shaft is held by the guide portion. Therefore, when a force is applied to the snap ring from the flat receiving portion, the snap ring can be engaged with the shaft extremely reliably and efficiently without falling over or coming off the engaging groove.

Further, in the invention described in claim 4,
In the snap ring according to the above item, a substantially T protruding outwardly along a radial direction of an outer peripheral edge of the substantially annular portion is provided on an outer side in a circumferential direction on a center line of the slit portion provided on an inner peripheral edge of the plate-shaped member.
A character-shaped protruding portion is provided, and the tip end portion of the protruding portion is a flat receiving portion, and the width of the rising portion of the plate-shaped member that continues in the center direction from the flat receiving portion of the left and right side edge portions of the protruding portion is The retaining ring has recesses formed on the left and right side edge portions of the center line of the protrusion so as to be narrower than the width of the flat receiver of the protrusion.

According to the invention described in claim 4, the retaining ring has a projecting portion projecting outward in the radial direction of the opening at a position opposed to the slit portion with the plate-shaped member interposed therebetween. Also,
The projecting portion has a flat receiving portion at its tip, and has a generally T-shaped shape that is constricted near the slit portion closer to the center than the flat receiving portion. Therefore, when the retaining ring is brought into contact with the engagement groove at the taper portion and a force is applied at the flat receiving portion, the retaining ring can be easily engaged with the engagement groove by bending of the constricted portion. it can.

In addition to this, by forming the protruding portion as described above, the retaining ring can be efficiently engaged with the engaging groove,
A jig for removing from the engaging groove can be easily created.

According to the invention described in claim 5, claim 4
In a retaining ring attaching / detaching jig for attaching / detaching the retaining ring to / from the engaging groove portion of the shaft, the jig is made of a plate-shaped member, and at least one end of the plate-shaped member is provided with at least the flat receiving portion of the retaining ring. An engaging notch having a similar shape to the outer peripheral edge of the retaining ring reaching the recess is provided in an open state, and one end of the plate member is pushed to the left and right at the engaging notch. A snap ring attachment / detachment jig is provided in which a split slit that is elastically deformable so as to open is formed upward from the central portion of the cutout portion.

According to the fifth aspect of the present invention, when the retaining ring is engaged with the engaging groove, the engaging notch portion of the retaining ring attaching / detaching jig has an outer peripheral edge extending from the flat receiving portion of the retaining ring to the concave portion. Can be held in a state of being engaged with the engaging groove, and when mounted in the engaging groove, the retaining ring can be easily engaged with the engaging groove by applying a force from the retaining ring attaching / detaching jig to the flat receiving portion. it can.

Further, when the retaining ring is removed from the engaging groove, the retaining notch of the retaining ring attaching / detaching jig is pulled away from the shaft while being engaged with the outer peripheral edge from the flat receiving portion of the retaining ring to the recess. The retaining ring can be easily removed from the engagement groove by applying a tensile force in the direction. That is, the retaining ring and the retaining ring attaching / detaching jig are engaged and held by the substantially T-shaped portion of the projecting portion, and when applying a pulling force in the direction of removing the retaining ring from the engagement groove, this portion is engaged. The tensile force is efficiently transmitted to. Therefore,
The snap ring can be reliably and efficiently removed from the engagement groove.

In addition, since the retaining ring is attached to and detached from the engaging groove, when the retaining ring attaching / detaching jig is engaged with the retaining ring, the engaging notch of the retaining ring attaching / detaching jig is set to the flat receiving portion of the retaining ring. This can be easily performed by bringing them into contact with each other and pressing the jig in a direction from the retaining ring attaching / detaching jig toward the retaining ring. At this time, since the vicinity of the slit portion of the retaining ring attaching / detaching jig is bent, the retaining ring attaching / detaching jig can be easily fitted into the retaining ring protruding portion, and the engaging and holding can be facilitated. Therefore, the work of engaging the retaining ring with the engaging groove and removing the retaining ring from the engaging groove can be performed with one jig, and the handling becomes easier.

[0023]

DETAILED DESCRIPTION OF THE INVENTION A retaining ring 1 according to the present invention will be described below with reference to the drawings. The retaining ring 1 is a plate-shaped member obtained by punching a flat plate of, for example, SK5 steel (carbon steel for tools) having a constant thickness. As shown in FIG. 1, a retaining ring
Reference numeral 1 denotes a substantially annular member having a substantially circular opening 11 on the inner side of the center and a cutout portion extending from the opening 11 to the outside (outer peripheral side).
It has a shape formed by communicating with 10 and forming a substantially C-shaped arc. In addition to the cutout portion 10 and the opening portion 11, the entire retaining ring 1 has a slit portion 12, a taper portion 13, a guide portion 14, and a protruding portion 15.
And so on.

The opening 11 forms the inner peripheral side of the retaining ring 1 having a substantially annular shape, and is an engaging groove of the shaft S indicated by an imaginary line.
When the retaining ring 1 is engaged with M, the inner peripheral edge 11a abuts on the bottom m of the engagement groove M provided on the circumference of the side surface of the shaft S. Inner peripheral edge 1
Reference numeral 1a is an arc having an inner diameter substantially equal to the diameter of the bottom m of the engagement groove M, and has a circumferential length that is ½ or more of the circumference of the bottom of the engagement groove M. The notch 10 has a shape in which the opening 11 communicates with the outside of the retaining ring 1.

The slit portion 12 is provided so as to face the notch portion 10 at the axial center. The slit portion 12 passes through the center of the notch portion 10 and has a center line C along the radial direction of the arc forming the inner peripheral edge 11a,
It has a concave shape in which the opening 11 is cut in the radial direction from the intersection with the inner peripheral edge 11a toward the outer peripheral portion of the retaining ring 1.

The taper portion 13 is an opening portion of two tip edges F of the plate-like member forming the retaining ring 1, which face each other with the notch portion 10 in between.
It is formed by the part on the 11 side. The taper portion 13 has a distance between two ends facing each other with the notch 10 on the inner peripheral edge 11a side smaller than the diameter of the arc forming the inner peripheral edge 11a, and the tip is continuously formed toward the outer peripheral side. It is formed so as to have a substantially C-shaped shape in which the interval between the edges F becomes wider. The distance at the outer peripheral side end of the tapered portion 13 is approximately the same as the diameter of the bottom m of the engagement groove M.

The guide portion 14 is formed at a portion on the inner peripheral side of the tip edge F. The portion forming the guide portion 14 has a central axis C.
Are formed in parallel with each other, and the distance between the portions is preferably close to the diameter of the bottom m of the engaging groove M on the axis S for engaging.

The projecting portion 15 is provided on the outer peripheral side of the slit portion 12 of the retaining ring 1, that is, at an outer position facing each other across the plate member, and is axially symmetric along the center line C, that is, centered on the opening 11. Has a form projecting to the side opposite to the taper part 13 and the guide part 14, the projecting part 15 has a flat receiving part 15a, and the recesses 1 are provided on both sides.
Composed with 5b.

At the tip of the protruding portion 15, there is provided a flat receiving portion 15a formed in a substantially straight line orthogonal to the center line C. Further, the width of the side edge portion of the protruding portion 15 closer to the center than the flat receiving portion 15a, that is, the portion corresponding to the root of the protruding portion 15 and near the slit portion 12, is the width of the flat receiving portion 15a. Is narrower than. That is, this portion has a shape that is narrowed to the left and right, and forms the recess 15b.
The protruding portion 15 has a substantially T-shape by including the flat receiving portion 15a and the concave portion 15b.

The outer peripheral portion of the retaining ring 1 has a concave shape at the outer peripheral portion between the protruding portion 15 and a portion near the tip edge F forming the guide portion 14 serving as the introduction portion of the shaft S. There is. That is, the width of the plate member forming the retaining ring 1 in the circumferential direction is determined by the slit portion 12
In the left and right neighboring portions of N, the width is narrower than the wide portion up to the portion near the tip edge F forming the guide portion 14.

As described above, by narrowing the width of the opening 11 along the radial direction only in the left and right adjacent portions of the slit portion 12, the retaining ring 1 can be efficiently engaged with the engaging groove M. In addition, when the retaining ring 1 is engaged with the engaging groove M, the retaining ring 1 can be provided with a strength sufficient to prevent the retaining ring 1 from coming off the engaging groove M during rotation of the shaft S. .

Next, the engaging groove of the shaft S of the retaining ring 1 according to the present invention
The engagement with M will be described.

First, the retaining ring 1 is fitted into the engaging groove of the shaft S by the guide portion 14.
Install so that the bottom m of M is clamped. Subsequently, the flat receiving portion 15a of the protruding portion 15 is pushed toward the center of the shaft S with a tool such as a screwdriver having a flat surface portion. The force pushing the flat receiving portion 15a is transmitted from the taper portion 13 to the portion between the slit portion 12 and the concave portion 15b, and the left and right H portions between the slit portion 12 and the concave portion 15b are bent by this force. In this way the notch of the opening 11
The width of 10 widens, and the distance between the end of the tapered portion 13 on the opening side is the axis.
By opening larger than the diameter of the bottom m of the engagement groove M in S, the retaining ring 1 can be engaged with the engagement groove M. After that, the retaining ring 1 is pushed by pushing the protruding portion 15 side toward the center of the shaft S until the inner peripheral edge 11a of the opening 11 comes into contact with the bottom m of the engaging groove M of the shaft S.
And the engagement with the shaft S are completed.

As shown in FIG. 1, a retaining ring according to the present invention.
The inner peripheral edge 11a of 1 has a circumference length of ½ or more of the circumference of the bottom m of the engagement groove M. Therefore, the retaining ring 1 engaged with the engaging groove M is larger than that of the conventional E-type retaining ring 50 in the engaging groove M.
It comes into contact with the side surface portion (hatched portion) up to the bottom portion m of with a larger contact area. Specifically, for example, the nominal size of the retaining ring 1 and the conventional E-type retaining ring 50 is 1.2 m.
m, the outer diameter of the shaft S is 1.5 mm, and the length of the inner peripheral edge 11a of the retaining ring 1 is 2/3 of the circumference of the bottom m of the engaging groove M, the retaining ring 1 and the engaging groove M The contact area with the conventional E-shaped snap ring 50 and the engagement groove M is about 1.5 times.

By increasing the contact area with the engagement groove M in this way, as shown in FIG. 6, when the shaft S rotates while the thrust G is applied in the direction of the arrow of the shaft, the retaining ring 1 is rotated. The force per unit area exerted on the portion of the engagement groove M that comes into contact with the side surface is smaller than that in the case of the conventional E-type snap ring 50. As a result, the snap ring 1 is less likely to wear when sliding due to the rotation of the shaft S. As a result, the retaining ring 1 according to the present invention has high wear resistance and a long life. Therefore, the positional relationship between the shaft S and the instrument body B can be optimally maintained over a long operating time.

Further, by providing the flat receiving portion 15a having a linear shape orthogonal to the central axis C, the retaining ring 1 can be efficiently engaged with the engaging groove M. That is, when a pressing force is applied to the flat receiving portion 15a via a tool, the tool is prevented from slipping off from the outer peripheral edge of the retaining ring 1,
The force can be effectively applied to the taper portion 13 of the retaining ring 1 without using a dedicated jig.

Furthermore, the width of the plate member forming the retaining ring 1 in the radial direction in the vicinity of the left and right of the slit portion 12 is made narrower than the width in the opening 11 and the recess 15b is provided, whereby the retaining ring 1 The plate-shaped member forming is shaped so as to narrow at the peripheral portion of the slit portion 12. Therefore, when the flat receiving portion 15a is pressed, the peripheral portion is easily bent,
The tapered portion 13 can be gradually opened. Therefore, the retaining ring 1 can be reliably and efficiently engaged with the engagement groove M.

In addition, when engaging the retaining ring 1, the retaining ring 1 is installed so that the engaging groove M is sandwiched by the guide portions 14. By the guide portion 14 sandwiching the engagement groove M,
Since the retaining ring 1 is temporarily supported by the shaft S, the retaining ring 1 is prevented from falling down or coming off when the flat receiving portion 15a is pressed. Therefore, more effectively
Since 1 can be pressed, the efficiency in engaging the retaining ring 1 with the engagement groove M is further improved.

Next, the retaining ring 1 according to the present invention is installed in the engaging groove of the shaft S.
The retaining ring attachment jig 3 for engaging with M will be described. The retaining ring attachment / detachment jig 3 is a plate-like member formed by punching a flat plate of SK5 steel (carbon steel for tools) having a constant thickness into a substantially rectangular shape as shown in FIG. It is formed by including a guide portion 31 and a slit portion 32.

The engagement guide portion 31 has substantially the same shape as the outer peripheral edge of the portion from the flat receiving portion 15a of the protruding portion 15 of the retaining ring 1 to the recessed portion 15b and the vicinity of the protruding portion 15, and in FIG. It is provided in an open form at the axial lower side of the side cross section. The engagement guide portion 31 engages with the protruding portion 15 and a portion in the vicinity of the protruding portion 15 as shown in FIG. Further, the slitting portion 32 is provided in a form that is cut from a portion communicating with the flat receiving portion 15a of the engagement guide portion 31 toward the upper side in FIG. 2 in a form orthogonal to the portion.

Engagement of the retaining ring 1 with the engaging groove M using the retaining ring attaching / detaching jig 3 is carried out with the engaging groove M being held by the guide portion 14 in the engaging guide of the retaining ring attaching / detaching jig 3. This can be performed by engaging the portion 31 with the protruding portion 15 of the retaining ring 1 and the vicinity of the protruding portion 15 and then pressing the flat receiving portion 15a via the retaining ring attaching / detaching jig 3.

When the retaining ring 1 is to be removed from the shaft S for maintenance of a mechanical device equipped with the shaft S, the engaging guide portion 31 of the retaining ring attaching / detaching jig 3 is attached to the protruding portion 15 of the retaining ring 1. Also, after engaging with a recess or the like in the vicinity of the protruding portion 15, the retaining ring attachment jig 3 can be pulled in the pull-out direction in the central axis C direction.

When the retaining ring 1 is pulled as described above, the pulling force is first applied to the opening of the taper portion 13 via the protruding portion 15.
It is applied to both end portions on the 11 side and is further transmitted to the vicinity of the slit portion 12. Further, the vicinity of the slit portion 12 is bent and the width of the taper portion 13 is widened so that the retaining ring 1 is engaged with the engaging groove M.
Can be removed from.

Here, the protruding portion 15 of the retaining ring 1 is formed with concave portions 15b-15b on both sides, and the engagement guide portion 31 of the retaining ring attaching / detaching jig 3 is engaged with this portion. Therefore, when the retaining ring attaching / detaching jig 3 is engaged with the retaining ring 1, when the retaining ring attaching / detaching jig 3 is pulled in the direction of removing the retaining ring 1 from the engaging groove M, the retaining ring attaching / detaching jig 3 is removed from the retaining ring 1. Without being disengaged, the tensile force is transmitted from the portion of the engagement guide portion 31 that abuts the recess 15b-15b to the recess 15b-15b. By the tensile force thus transmitted, the portion of the retaining ring 1 in the vicinity of the slit portion 12 is bent, so that the retaining ring 1 can be removed from the engagement groove M reliably and efficiently.

The retaining ring 1 and the retaining ring attaching / detaching jig 3 may be engaged with each other by sliding the retaining ring attaching / detaching jig 3 with respect to the retaining ring 1 in the axial direction of the axis S, and fitting them together. Retaining ring
After abutting the protruding portion 15 of 1 and the engagement guide portion 31 of the retaining ring attaching / detaching jig 3, the retaining ring attaching / detaching jig 3 may be pressed in the direction of the retaining ring 1 to be fitted and engaged. . When pressing the snap ring attachment / detachment jig 3 toward the snap ring 1 direction, the snap ring attachment / detachment jig 3
The entire slit portion 32 spreads in the width direction W of the slit and bends, so that the retaining ring attaching / detaching jig 3 can be easily engaged with the retaining ring 1.

By using the retaining ring attaching / detaching jig 3, it is possible to effectively apply a pressing force or a pulling force to the retaining ring 1 when attaching / removing the retaining ring 1 to / from the engagement groove M. Therefore, the work of engaging the retaining ring 1 with the shaft S or removing it from the shaft S is efficient and can be performed efficiently.

Further, the retaining ring attaching / detaching jig 3 is provided with the slit portion 32 so that the retaining ring attaching / detaching jig 3 can be easily engaged with the retaining ring 1 when the retaining ring 1 is attached to / detached from the engaging groove M. You can Therefore, the work of engaging the retaining ring 1 with the engaging groove M of the shaft S and removing the retaining ring 1 from the engaging groove M can be performed reliably and efficiently.

The leading edge FF of the retaining ring 1 forming the guide portion 14
The distance is preferably substantially the same as the diameter of the bottom m of the engagement groove M of the shaft S, but is not limited thereto. If the retaining ring 1 is effectively supported by the shaft S when the retaining ring 1 is engaged with the engagement groove M, the distance between the tip edges FF of the retaining ring 1 is set to be smaller than that of the shaft S. The length may be longer than the diameter of the engagement groove M and shorter than the outer diameter of the shaft S.

The material of the retaining ring 1 and the retaining ring attaching / detaching jig 3 according to the present invention is not limited to SK5 steel as described above. As long as it is a material having wear resistance and toughness, for example, the snap ring 1 and the snap ring attachment / detachment jig 3 may be made of SKS steel.
It may be formed of steel.

The form of the retaining ring 1 according to the present invention is not limited to the above-mentioned shape. For example, the retaining ring 1 may have a shape in which the guide portion 14 is almost omitted as shown in FIG. In addition, the retaining ring 1 can be easily engaged with the engagement groove M, and when the retaining ring 1 is engaged with the engagement groove M, the retaining ring 1 is removed from the engagement groove M during rotation of the shaft S. If the retaining ring 1 has such strength that it does not come off, for example, as shown in FIG. 4, in the plate-shaped member from the left and right end portions of the protruding portion 15 to the front end portion forming the guide portion 14, The opening 11 may have a uniform radial width.

[0051]

According to the invention described in claim 1, it is possible to reduce the abrasion due to the sliding of the portion in the vicinity of the inner peripheral surface, and it is possible to extend the life of the shaft of the retaining ring. Therefore, there is no play over a long operating time of the mechanical device including the shaft,
The positional relationship between the shaft and the main body of the device can be kept optimum.

Further, with the retaining ring in contact with the bottom of the engaging groove at the taper portion, a pressing force is applied to the retaining ring in the radial direction of the opening, from the slit to the notch. Thereby, the retaining ring can be easily engaged with the engagement groove.

In addition, by providing the retaining ring with the flat receiving portion, when the retaining ring is pressed in the radial direction of the opening while being in contact with the fitting groove by the tapered portion, the flat receiving portion of the retaining ring is provided. For example, if a force is applied by using a device having a flat surface such as a flat-blade screwdriver, the device does not slip on the outer periphery of the retaining ring, and the retaining ring can be engaged with the engaging groove reliably and efficiently. You can

According to the second aspect of the present invention, since the retaining ring has a constricted shape in the vicinity of the slit portion, the retaining ring is easily bent at the constricted portion, and the retaining ring is easily engaged. The groove can be engaged.

According to the third aspect of the present invention, when a force is applied to the flat receiving portion in a state where the retaining ring is in contact with the engaging groove by the taper portion, the retaining ring holds the shaft by the guide portion. In the form
The shaft is supported in a temporary state. Therefore, when a force is applied to the retaining ring from the flat receiving portion, the retaining ring does not fall over or disengage from the engaging groove, so that the retaining ring can be engaged with the shaft extremely reliably and efficiently.

According to the invention described in claim 4, when a force is applied to the flat receiving portion, the constricted portion near the slit portion of the projecting portion bends, so that the snap ring can be easily engaged with the engaging groove. The jig for efficiently engaging the retaining ring with the engaging groove and removing the retaining ring from the engaging groove can be easily produced.

Further, according to the invention described in claim 5, the work of engaging the retaining ring with the engaging groove and removing it from the retaining ring and the engaging groove becomes easier.

[Brief description of drawings]

FIG. 1 is a schematic front view showing the relationship between a retaining ring and a shaft according to the present invention.

FIG. 2 is a schematic front view showing a relationship between a retaining ring and a retaining ring attaching / detaching jig according to the present invention.

FIG. 3 is a front view of a retaining ring according to another embodiment of the present invention.

FIG. 4 is a front view of a retaining ring according to another embodiment of the present invention.

FIG. 5 is a schematic front view showing the relationship between a conventional E-type retaining ring and a shaft.

FIG. 6 is a schematic partial cross-sectional side view showing a state in which the shaft S is positioned using a conventional E-type snap ring or the snap ring according to the present invention.

[Explanation of symbols]

1 retaining ring 2 Retaining ring removal jig 5 E retaining ring 10 Notch 11 opening 12 Slit part 13 Tapered part 14 Information 15 Projection 15a Flat receiving part 15b recess 31 Engagement guide part 32 pickpocket

Claims (5)

[Claims] 1. A retaining ring to be mounted in the engaging groove of a rotary shaft or a fixed shaft, the retaining ring having a narrow engaging groove formed along the circumferential direction of the shaft, wherein the retaining ring has a substantially annular shape. A notch formed in a substantially arcuate shape having a circular opening in a partly cut-out center and communicating with the opening extending from the center to the outer peripheral direction so as to open the substantially arcuate shape in one direction Is a plate-shaped member having a portion, the inner diameter of the center of the substantially annular opening of the inner peripheral edge of the plate-shaped member is substantially equal to the groove bottom diameter in the engagement groove of the shaft, and is opposed to each other across the notch. 2 on the inner peripheral side of the plate member
The distance between the two narrow ends is made smaller than the diameter of the engaging groove bottom of the shaft on the opening side, and the distance becomes wider toward the outer peripheral side of the plate-shaped member. An insertion taper portion in which the radially outer side edge of the end portion is tapered is provided in a part of the plate-shaped member, and is located at the inner peripheral edge of the plate-shaped member, and from the center position of the cutout portion. On the center line along the central radial direction of the opening, a slit portion that is recessed toward the outer peripheral side along the radial direction of the opening is provided, and in addition, the outer peripheral edge in the vicinity of the slit portion of the plate-shaped member,
The projecting end orthogonal to the center line is a flat receiving portion of a T-shaped tip formed in a substantially linear shape, and the inner peripheral edge of the plate-shaped member is the circumference of the engaging groove bottom portion of the shaft. Over at least half the perimeter,
A retaining ring which can be engaged with the engaging groove. 2. The width of a part of the opening near the left and right of the slit along the radial direction is narrower than the entire width of the plate member along the radial direction of the opening. The retaining ring according to claim 1, wherein 3. The engagement of the shafts is such that the distance between the opposing leading edges is on the inner peripheral edge side of the plate-shaped member, which is located outside the tapered portion and is radially outward from the two ends that sandwich the cutout portion. A distance equal to or larger than the diameter at the groove bottom and shorter than the outside diameter of the engaging groove of the shaft, and the facing tip edges are arranged in the radial direction from the center of the notch to the center of the slit. 3. The retaining ring according to claim 1 or 2, wherein the retaining ring is an introduction guide portion that is substantially parallel to a center line along the line. 4. A substantially T-shape projecting outward along a radial direction of an outer peripheral edge of the substantially annular portion on an outer side in a circumferential direction on a center line of the slit portion provided on an inner peripheral edge of the plate-shaped member. Is provided, and the tip portion of the projection is a flat receiving portion,
The width of the rising portion of the plate-shaped member continuing in the center direction from the flat receiving portion of the left and right side edge portions of the protruding portion is narrower than the flat receiving portion width of the flat receiving portion of the protruding portion. The retaining ring according to claim 3, wherein recesses are formed at side edge portions on the left and right sides of the center line. 5. A retaining ring attachment / detachment jig for attaching / detaching the retaining ring according to claim 4 to / from the engaging groove portion of the shaft, the retaining ring attaching / detaching jig being made of a plate-shaped member. An engaging notch having a similar shape to the outer peripheral edge of the retaining ring extending from the flat receiving portion of the ring to at least the concave portion is provided in an open state, and one end of the plate-shaped member is engaged. A snap ring attachment / detachment jig characterized in that an elastically deformable split slit is formed toward the upper side of the central portion of the notch so that the notch can be pushed leftward and rightward.