JP6621519B2 - E-type retaining ring removal tool - Google Patents

Description

  The present invention relates to an E-shaped retaining ring removal tool.

  When removing the E-type retaining ring inserted into the shaft, the general method is to insert the tip of a tool such as a flat-blade screwdriver or radio pliers into the gap between the shaft and the E-shaped retaining ring, and then twist the inserted tool. It is the target. However, such a sampling method is difficult because the operation is not stable, and may be scattered or dropped when the E-shaped retaining ring comes off the shaft.

  Therefore, a tool for extracting the E-shaped retaining ring has been proposed. For example, the tool described in Patent Document 1 is finally shaped, and a U-shaped groove is formed at the tip of the upper arm of the upper and lower sandwiched arms, and elastic in the groove. A holding member is provided. In such a tool, when a part of the E-shaped retaining ring is inserted into the groove, the E-shaped retaining ring is held by the groove.

  Moreover, the tool described in patent document 2 is provided with the through-hole of the retaining ring in one end part. The through-hole is provided with an extruding portion that comes into contact with both ends of the retaining ring and presses both ends to remove the retaining ring from the shaft. Moreover, the permanent magnet which adsorb | sucks before it disperses the retaining ring which remove | deviated from the axis | shaft is provided in the one end part.

JP 2007-038324 A JP-A-8-118253

  However, the tool according to Patent Document 1 forces the user to insert the inserted tool into the gap between the shaft and the E-shaped retaining ring and twist the inserted tool, and stable operation is difficult. Moreover, the tool concerning patent document 2 must give strong force with respect to the E-shaped retaining ring inserted in the axis | shaft.

  The present invention has been made to solve such problems, and can stably perform a series of operations for removing the E-shaped retaining ring from the shaft, thereby reducing the load on the user who uses the tool. It is an object of the present invention to provide an E-type retaining ring extraction tool.

  An E-type retaining ring extraction tool according to the present invention is an E-type retaining ring extraction tool for removing an E-type retaining ring from a radial direction with respect to a shaft into which the E-type retaining ring is inserted. A pair of shaft guide portions bifurcated so as to be loosely inserted into the shaft, a grip member having a grip portion on the other end side, and a pair of distal ends connected to the shaft guide portion and bifurcated An extraction piece having a flange for hooking an end portion of the E-shaped retaining ring; and a contact portion that slidably engages with the gripping member and abuts against the shaft; And a slide member that is displaced along the gap between the shaft guide portions branched into two.

  With such a configuration, the E-shaped retaining ring removal tool allows the abutting portion of the sliding portion to abut the shaft and displace the sliding member to hook the end of the E-shaped retaining ring. Removes the E-shaped retaining ring. Thereby, the E-shaped retaining ring removal tool can stably perform the work of removing the E-shaped retaining ring.

  Note that the slide member may have a slide shaft that holds the E-shaped retaining ring extracted from the shaft in a radial direction with the pair of flange portions interposed therebetween. Thereby, the E-shaped retaining ring removal tool can hold the removed E-shaped retaining ring.

  Moreover, the said collar part may each have the 1st holding | maintenance part which hold | maintains the axial direction of an E-shaped retaining ring. The slide member may have a second holding portion for holding the axial direction of the E-shaped retaining ring. Thereby, the E-shaped retaining ring removal tool can hold the E-shaped retaining ring in the axial direction, and can stably perform a series of operations.

  The extraction piece is a flat plate member, the first main surface is in contact with the gripping member, and the first holding portion is provided so as not to protrude from the second main surface of the extraction piece. Also good. The extraction piece is a flat plate member, the first main surface is in contact with the gripping member, and the second holding portion is provided so as not to protrude from the second main surface of the extraction piece. Also good. Thereby, the E-type retaining ring removal tool can improve the freedom of work.

  Further, the shaft guide portion may extend inward from the outer diameter of the E-shaped retaining ring in a state where the E-shaped retaining ring extracted from the shaft is held. Thereby, drop-off of the removed E-shaped retaining ring can be suppressed.

  Moreover, the E-shaped retaining ring removal tool may further include an elastic body that urges the flange portion of the removal piece and the contact portion of the slide member to be separated from each other. Thereby, a user's burden can be reduced.

  The E-shaped retaining ring removal tool may further include an operation member having an operation portion, slidably engaged with the gripping member, and interlocked with the slide member. Further, the gripping member and the operation member are pivotally supported with respect to each other, and the gripping portion and the operation portion are slid so as to be close to each other, whereby the flange portion of the removal piece and the slide member are The contact portions may be close to each other. Thereby, a user's burden can be reduced and the stable operation | work can be performed.

  The E-type retaining ring removal tool has one end engaged with the operation member and the other end engaged with the slide member that slides in the linear motion direction. There may be further provided a connecting member that converts the displacement in the linear motion direction. Thereby, the E-shaped retaining ring removal tool can efficiently remove the E-shaped retaining ring.

  Further, in the E-type retaining ring removal tool, the slide member further includes a relief hole that is loosely fitted to a collar slide shaft that is erected on the removal piece, and a stopper that is provided in a convex shape in the relief hole. Also good. In this case, when the E-type retaining ring removal tool is operated, the stopper is in contact with the abutment when at least one of the flanges is displaced along the outer diameter portion of the E-shaped retaining ring. Before the distance between the flange portion and the flange portion reaches a half of the outer diameter of the shaft, the flange portion and the contact portion are prevented from coming close to each other by contacting the flange slide shaft. preferable. Thereby, the E-type retaining ring removal tool can suppress the destruction of the E-type retaining ring removal tool and the like in a state where the E-type retaining ring is not normally mounted.

  In the present specification, the “E-type retaining ring” is a metal plate having a hollow disk shape and having an opening, and the metal plate from the radial direction of the shaft with respect to the shaft having a circumferential groove. This is a retaining ring that is inserted so as to push and widen the opening in the elastic region.

According to the present invention, it is possible to stably perform a series of operations for removing the E-shaped retaining ring from the shaft, and it is possible to provide an E-shaped retaining ring removing tool that reduces the load on the user who uses the tool.

1 is an overview of an E-shaped retaining ring removal tool 100 according to a first embodiment. FIG. 2 is an exploded perspective view of an E-shaped retaining ring removal tool 100 according to Embodiment 1. FIG. It is a figure for demonstrating the structure of the front-end | tip part in the E-shaped retaining ring extraction tool 100 concerning Embodiment 1. FIG. It is a figure of the state in which the E-shaped retaining ring extraction tool 100 concerning Embodiment 1 was mounted | worn to the axis | shaft. It is a figure of the state which the slide member of the E type retaining ring extraction tool 100 with which the axis | shaft was mounted | worn contact | abutted to the axis | shaft. It is a figure which shows the state in the middle of the E-shaped retaining ring extraction tool 100 extracting the E-shaped retaining ring. It is a figure which shows the state which the E-shaped retaining ring extraction tool 100 completed extraction of the E-shaped retaining ring. It is a figure which shows the state holding the E-shaped retaining ring which the E-shaped retaining ring extraction tool 100 extracted. It is a figure which shows the operation | movement which cancels | releases the E-shaped retaining ring which the E-shaped retaining ring extraction tool 100 extracted. It is a general-view figure of the E type retaining ring extraction tool 200 concerning Embodiment 2. FIG. It is a disassembled perspective view of the E type retaining ring extraction tool 200 concerning Embodiment 2. FIG. It is the figure which showed the shape of the escape hole of the slide member which the E-shaped retaining ring extraction tool concerning Embodiment 3 has. It is a figure which shows an example of the use condition which is not normal of the E-shaped retaining ring extraction tool concerning Embodiment 3. FIG. It is a figure which shows an example of the normal use condition of the E type retaining ring extraction tool concerning Embodiment 3. FIG.

  Embodiments will be described below with reference to the drawings. In the following description and drawings, components common to a plurality of drawings are denoted by common reference numerals. For this reason, the description of the components with common reference numerals will be omitted as appropriate.

  Further, in the following description, the axial direction indicates a direction parallel to the extending direction of the shaft into which the E-shaped retaining ring is inserted. The radial direction indicates a direction perpendicular to the axial direction of the shaft and extending radially from the axis.

<Embodiment 1>
First, an outline of the E-shaped retaining ring removal tool according to the first embodiment will be described with reference to FIG. FIG. 1 is an overview of an E-type retaining ring extraction tool 100 according to the first embodiment. The E-type retaining ring extraction tool 100 is an E-type retaining ring extraction tool that removes the E-type retaining ring from the radial direction with respect to the shaft into which the E-type retaining ring is inserted. The E-type retaining ring removal tool 100 includes a gripping member 110, an operation lever 120, a connecting member 130, a removal piece 140, and a slide member 150 as main components.

  The gripping member 110 is a long member, and has a pair of shaft guide portions 112 that are bifurcated so as to be loosely inserted into the shaft on one end side. The gripping member 110 has a removal piece 140 on one main surface on the one end side, and is engaged with the slide member 150 on the other main surface. The grip member 110 has a grip portion 111 on the other end side opposite to the one end side. In addition, the gripping member 110 has a first shaft 161 at an intermediate portion.

  The operation lever 120 is slidably engaged with the gripping member 110. The user operates the E-type retaining ring removal tool 100 by sliding the operation lever 120 and the gripping member 110 so as to change the relative positional relationship. One end side of the operation lever 120 is pivotally supported by the first shaft 161 at an intermediate portion of the gripping member 110. The operation lever 120 has an operation unit 121 on the other end side. The operation unit 121 is set to rotate within a range of a predetermined angle X with the first shaft 161 as a fulcrum. The user changes the angle X formed by the gripping member 110 and the operation lever 120 in the operation of the E-shaped retaining ring removal tool 100. The angle X is, for example, 0 to 30 degrees. It is preferable that the grip part 111 and the operation part 121 have a length that is easy for the user to operate. As described above, the operation lever 120 of the E-type retaining ring extraction tool 100 extends in the direction away from the front end side of the E-type retaining ring extraction tool 100 starting from the vicinity of the first shaft 161 that is a pivotal support point.

  The extraction piece 140 is in contact with the main surface of the gripping member 110 and is engaged so that the longitudinal direction of the extraction piece 140 coincides with the longitudinal direction of the gripping member 110.

  The slide member 150 is in contact with the main surface opposite to the surface with which the extraction piece 140 is in contact, and is slidably engaged in parallel with the longitudinal direction of the gripping member 110.

  The connection member 130 is pivotally supported by the operation lever 120 by the second shaft 162 at one end side. The connecting member 130 is pivotally supported on the slide member 150 by the third shaft 163 on the other end side.

  With the above-described configuration, the E-type retaining ring removal tool 100 can operate as follows. The operation lever 120 rotates in a direction A1 in which the distal end portion 111e of the grip portion 111 and the distal end portion 121e of the operation portion 121 approach each other. When the operation lever 120 rotates in the direction A1, the connecting member 130 transmits the displacement of the operation lever 120 to the slide member 150. As a result, the slide member 150 is displaced in a direction B1 parallel to the longitudinal direction of the gripping member 110 and approaching the shaft guide portion 112. That is, the connecting member 130 converts the displacement in the rotation direction of the operation lever 120 that is the operation member and the displacement in the linear movement direction of the slide member 150.

  On the other hand, the E-shaped retaining ring removal tool 100 can also operate as follows. The operation lever 120 rotates in a direction A2 in which the distal end portion 111e of the grip portion 111 and the distal end portion 121e of the operation portion 121 are separated from each other. When the operation lever 120 rotates in the direction A <b> 2, the connecting member 130 transmits the displacement of the operation lever 120 to the slide member 150. As a result, the slide member 150 is displaced in a direction B <b> 2 parallel to the longitudinal direction of the gripping member 110 and away from the shaft guide portion 112.

  Next, details of each configuration of the E-shaped retaining ring removal tool 100 will be described with reference to FIG. FIG. 2 is an exploded perspective view of the E-shaped retaining ring removal tool 100 according to the first embodiment. Details of each part will be described below.

  First, details of the gripping member 110 will be described. The holding member 110 is a long member, and is formed by press molding a metal plate. The material of the metal plate is, for example, iron or stainless steel containing iron as a main component. The gripping member 110 includes a gripping part 111, a shaft guide part 112, a relief hole 113, a guide groove 114, a guide hole 115, a sixth hole 186, a first shaft 161, and a fifth shaft 165.

  The grip portion 111 is a portion that is gripped when the user operates the E-shaped retaining ring removal tool 100, and is provided at one end portion of the grip member 110. The grip portion 111 is covered with, for example, resin, rubber, or elastomer.

  The shaft guide portion 112 serves as a guide when the tip portion of the E-shaped retaining ring removal tool 100 is inserted into the shaft into which the E-shaped retaining ring is inserted. The shaft guide portion 112 has a pair of shapes that are bifurcated so as to be loosely inserted into the shaft. The shaft guide portion 112 is provided at the end opposite to the grip portion 111, and maintains a predetermined interval that is about 5% larger than the diameter of the shaft that is a work target with respect to the longitudinal direction of the grip member 110. Are stretched in parallel. As a result, the shaft guide 112 can loosely insert the shaft that is the work target, and can be easily detached.

  The escape holes 113 are holes provided in the vicinity of the pair of shaft guide portions 112, respectively. In the escape hole 113, the seventh shaft 167 fitted to the removal piece 140 is inserted, and the seventh shaft 167 is loosely fitted in the escape hole 113.

  The guide groove 114 is a groove that guides the slide shaft 156 of the slide member 150 in the longitudinal direction of the gripping member 110. The guide groove 114 is a groove provided on the base side of the shaft guide portion 112, and the groove extends in the longitudinal direction of the gripping member 110 so as to guide the slide shaft 156. The diameter of the slide shaft 156 is set smaller than the diameter of the shaft that is the work target. That is, the distal end portion of the gripping member 110 extends in parallel by a width that allows the pair of shaft guide portions 112 to loosely fit the shaft to be worked. The tip portion has a shape that is narrower than the width of the shaft guide portion 112 from the base of the shaft guide portion 112 and has a shape in which a groove having the same width as the width of the slide shaft 156 is further extended.

  The guide hole 115 has an elongated hole shape extending in the longitudinal direction of the gripping member 110, and a third shaft 163 included in the connecting member 130 is engaged so as to be freely movable. The third hole 183 of the spacer 135 is inserted into the third shaft 163 engaged with the guide hole 115. The third shaft 163 has a hollow hole 184, and the fourth shaft 164 of the slide member 150 is rotatably engaged with the hollow hole 184. That is, the 3rd axis | shaft 163 of the connection member 130 and the 4th axis | shaft 164 of the slide member 150 are connected, and the guide hole 115 guides so that these connected members may move linearly. Further, the guide groove 114 and the guide hole 115 extend in parallel. Thereby, the slide member 150 can slide parallel to the longitudinal direction of the holding member 110 without rattling.

  The spacer 135 is for maintaining a gap corresponding to the thickness of the operation lever 120 generated between the connecting member 130 and the gripping member 110 without a backlash. A step is provided on the third shaft 163 in place of the spacer 135. It may be provided, or a spacer may be erected on the holding member 110. Further, the connecting member 130 may be subjected to a step bending process, or other means conceivable by those skilled in the art may be employed.

  The sixth shaft 166 is fitted into the sixth hole 186. The sixth shaft 166 engages with the hook of the coil spring 199. The sixth shaft 166 may be formed as a separate body as shown in FIG. 2 and may be fitted into the sixth hole 186, or may be erected as an integral shaft by molding the gripping member 110. May be.

  The first shaft 161 is a shaft erected at the center of the gripping member 110 and engages with the first hole 181 of the operation lever 120.

  Next, details of the operation lever 120 will be described. The operation lever 120 is a plate-like member having an L-shaped main surface composed of a short part and a long part. Of the two arms extending in an L shape, a second hole 182 is formed in the vicinity of the end of the short portion that is relatively short with respect to the long portion, and a bent portion between the short portion and the long portion is formed. A first hole 181 is formed. Further, a step bending process is performed on the long portion side near the first hole 181 so as to coincide with the gripping member 110 in the thickness direction, and an operation portion 121 is formed from the vicinity of the step bending process to the end of the long portion. ing. The operation lever 120 is formed by press molding a metal plate.

  The operation unit 121 is a part that is gripped when the user operates the E-type retaining ring removal tool 100. The operation unit 121 is covered with, for example, resin, rubber, or elastomer. The first hole 181 is rotatably engaged with the first shaft 161 of the gripping member 110 and serves as a fulcrum when the operation lever 120 rotates. The second hole 182 is rotatably engaged with the second shaft 162 of the connecting member 130.

  Here, the position of the second hole 182 will be described. As described with reference to FIG. 1, the operation lever 120 is configured such that the operation unit 121 approaches or moves away from the grip 111 (direction A1) with the first hole 181 engaged with the first shaft 161 as a fulcrum. To turn. The second hole 182 rotates in a direction (direction B1) approaching the shaft guide portion 112 when the operation portion 121 approaches the grip portion 111 (direction A1), and the operation portion 121 moves away from the grip portion 111 (direction A2). And so as to rotate in a direction away from the shaft guide portion 112 (direction B2). Thus, when the user operates the grip portion 111 and the operation portion 121 to approach each other, the slide member 150 approaches the shaft guide portion 112 via the connecting member 130 connected to the second hole 182. It is displaced to. Note that the displacement trajectory of the second hole 182 is along the longitudinal direction of the gripping member 110 in order to efficiently convert the direction A1 and the direction A2 that rotate about the first shaft 161 into the directions B1 and B2 that move linearly. It is preferable to set as follows.

  Next, details of the connecting member 130 will be described. The connecting member 130 is a long metal member, and has a second shaft 162 at one end and a third shaft 163 at the other end. The second shaft 162 is rotatably engaged with the second hole 182 of the operation lever 120. The third shaft 163 is inserted through the third hole 183 of the spacer 135 and the guide hole 115 of the gripping member 110 and is rotatably engaged with the fourth shaft 164 of the slide member 150.

  Next, details of the extraction piece 140 will be described. The extraction piece 140 is a long metal member that engages with the main surface of the gripping member 110. The metal material composing the extraction piece 140 has elasticity, and is, for example, iron or stainless steel containing iron as a main component. The extraction piece 140 includes a fifth hole 185, an arm part 142, a seventh hole 187, a retaining ring loose fitting part 143, and a flange part 144. The extraction piece 140 is bifurcated at the tip, and is provided with a flange 144 for hooking the ends of the E-shaped retaining rings to the pair of branched branches.

  In the vicinity of the pair of flange portions 144, a retaining ring free fitting portion 143 to which an E-shaped retaining ring is loosely fitted is provided. The retaining ring loose fitting portion 143 is formed so that the circular notches are opposed to each other. The E-shaped retaining ring is loosely fitted to the retaining ring loosely fitting portion 143 when removing the E-shaped retaining ring that is a removal target.

  Seventh holes 187 are formed in the vicinity of the pair of retaining ring loose fitting portions 143, and the seventh shaft 167 is fitted into each of the seventh holes 187. The seventh shaft is inserted so as to loosely fit into the escape hole 113 of the gripping member 110 and the escape hole 153 of the slide member 150, and has a flange portion at the tip. Since the seventh shaft 167 has a flange portion at the tip, the flange portion and the removal piece 140 sandwich the gripping member 110 and the slide member 150. Therefore, the holding member 110 and the removal piece 140 are kept in contact with each other, and similarly, the holding member 110 and the slide member 150 are kept in contact with each other.

  The arm portion 142 is bifurcated from the vicinity of the fifth hole 185 and extends parallel to the longitudinal direction toward the tip of the extraction piece 140. The tip of the arm part 142 is the tip of the removal piece 140, and the tip has a flange 144, a retaining ring free fitting part 143, and a seventh hole 187. The arm portion 142 bends in a direction away from each other when the pair of flange portions 144 are removed from the shaft when the E-shaped retaining ring is removed from the shaft, and after being removed from the shaft from the E-shaped retaining ring, the collar portion 144 is in a predetermined position. It has the resilience to the extent that it can be restored.

  The fifth hole 185 is fitted to the fifth shaft 165 of the gripping member 110.

  Next, details of the slide member 150 will be described. The slide member 150 is a long metal member, and is linked to the operation lever 120 via the connecting member 130 and slides in the longitudinal direction of the gripping member 110 and comes into contact with the shaft into which the E-shaped retaining ring is inserted. It has a function. In the slide member 150, the main surface of the slide member 150 and the main surface of the gripping member 110 are in contact with each other. The slide member 150 is slidably engaged with the gripping member 110 and is displaced parallel to the longitudinal direction of the gripping member 110. The slide member 150 includes a contact portion 154, a relief hole 153, a slide shaft 156, a fourth shaft 164, and a fifth shaft 165.

  The abutting portion 154 has a function of abutting on the shaft on which the E-shaped retaining ring is mounted at the distal end portion of the slide member 150. The contact portion 154 has a surface perpendicular to the longitudinal direction of the slide member 150 on the front end side of the slide member 150 erected on the surface in contact with the gripping member 110.

  The escape hole 153 is a hole through which the seventh shaft 167 is inserted. The escape hole 153 is a substantially rectangular hole and has a size that does not prevent the seventh shaft 167 from moving toward and away from each other and does not prevent the slide member 150 from sliding. Further, the escape hole 153 is in contact with the flange of the seventh shaft 167 so that the constituent members at the tip of the E-shaped retaining ring removal tool 100 can operate without backlash in the thickness direction.

  The slide shaft 156 holds the E-shaped retaining ring by coming into contact with the outer periphery of the E-shaped retaining ring when the E-shaped retaining ring is removed. The slide shaft 156 is erected from the main surface of the slide member 150 on the side in contact with the gripping member 110, and the base side is slidably engaged with the guide groove 114. The slide shaft 156 has a second holding part 155 at the top. The second holding portion 155 is formed in a bowl shape at the tip of the slide shaft 156 and extends to the tip side of the gripping member 110. The second holding portion 155 has a function of holding the E-shaped retaining ring in order to prevent the removed E-shaped retaining ring from unintentionally falling off the E-shaped retaining ring extraction tool 100.

  The fourth shaft 164 protrudes toward the gripping member 110 and is rotatably engaged with the third shaft 163 of the connecting member 130. The fifth shaft 165 is a shaft erected on the surface opposite to the surface in contact with the gripping member 110 and serves as a hook of the coil spring 199. The fourth shaft 164 and the fifth shaft 165 may be an integral shaft.

  The E-type retaining ring removal tool 100 has a coil spring 199. One of the coil springs 199 is engaged with the sixth shaft 166 of the gripping member 110, and the other is engaged with the fifth shaft 165 of the slide member 150. The coil spring 199 is a tension coil spring and urges the fifth shaft 165 and the sixth shaft 166 to approach each other. In other words, the coil spring 199 biases the contact portion 154 in a direction away from the tip of the gripping member 110. Alternatively, the coil spring 199 biases the grip portion 111 and the operation portion 121 away from each other.

  Next, an operation of removing the E-shaped retaining ring 800 from the shaft 900 that is a work target will be described with reference to FIGS. Of the operations described below, the operation of changing the relative position of the shaft 900 and the E-shaped retaining ring removal tool 100 causes the shaft 900 to be stationary and the E-shaped retaining ring removal tool 100 to be displaced. It is described in.

  First, the structure of the front-end | tip part of the E-shaped retaining ring extraction tool 100 is demonstrated, referring FIG. FIG. 3 is a view for explaining the structure of the tip of the E-type retaining ring extraction tool 100 according to the first embodiment. FIG. 3 shows a part of the structure transparently for easy understanding.

  In addition, the drawing shown below has shown the right-handed system xyz coordinate suitably. These right-handed xyz coordinates are convenient for explaining the positional relationship of the constituent elements. For example, the z-axis direction in FIG. 3 and the z-axis direction of the right-handed system coordinates shown in FIG.

  In FIG. 3, the E-shaped retaining ring extraction tool 100 has an extraction piece 140, a gripping member 110, and a slide member 150 overlapping from the z-axis positive direction to the negative direction. In FIG. 3, the E-shaped retaining ring removal tool 100 does not sandwich the E-shaped retaining ring and does not receive an external force.

  Below, the detail about the front-end | tip part of the extraction piece 140 is demonstrated. At the tip of the extraction piece 140, a pair of arm portions 142 extend from the y-axis minus direction toward the plus direction, the surfaces of the extended arm portions gradually expand, and a seventh shaft 167 is erected on the expanded surface. ing.

  The pair of seventh shafts 167 fitted to the removal piece 140 is displaced in the direction F1 together with the flange portion 144. The seventh shaft 167 has an end portion of the clearance hole 113 that is loosely fitted and a distance w31. Therefore, the seventh shaft 167 can be displaced in the range of the interval w31.

  Further, the distal end portion of the removal piece 140 has a retaining ring loose fitting portion 143 further on the distal end side from the seventh shaft 167. The pair of retaining ring loose fitting portions 143 are formed so that the circular notches are opposed to each other and follow a circular shape having a diameter D3. The diameter D3 is, for example, about 10 percent larger than the diameter D2 of the E-shaped retaining ring 800.

  The distal end portion of the extraction piece 140 has a distal end side of a retaining ring loose fitting portion 143 that approaches a predetermined position along a circular shape having a diameter D3, and further has a flange 144 on the distal end side. The flange portion 144 has a flange end portion 144a that comes into contact with the end portion of the E-shaped retaining ring 800 on the y-axis negative direction side. The flange end portion 144a has a straight portion in the x-axis direction so that the end portion of the E-shaped retaining ring 800 can abut with a predetermined width.

  Further, the main surface on the z-axis plus side of the extraction piece 140 at the position of the flange end portion 144a has a first holding portion 145 having a flange shape. The first holding portion 145 holds the E-shaped retaining ring 800 in the axial direction when the E-shaped retaining ring 800 is in contact with the flange end portion 144a.

  The pair of flanges 144 has a shape that extends from the straight part of the flange end 144a to the tip side while drawing a curve, and gradually expands away from each other when approaching the interval w11. Due to such a shape, the collar portion 144 is difficult to damage the shaft when the shaft that is a work target comes into contact with the collar portion 144, and the tip portion is easy to be inserted into the shaft.

  When the pair of flange portions 144 of the extraction piece 140 receives an external force in the direction F1, the arm portion 142 is bent and deformed. When the arm portion 142 is deformed, the pair of flange portions 144 are configured to expand in the direction F1 so as to be separated from each other. In addition, the pair of flange portions 144 is configured to be restored to the original shape by the restoring force of the arm portion 142 when released from the external force in the direction F1.

  Next, the front end portion of the gripping member 110 will be described. As shown in FIG. 3, a guide groove 114 that guides the slide shaft 156 extends from the y-axis minus direction side toward the plus direction side at the center in the short direction of the gripping member 110. The guide groove 114 has at least a linear portion having a length w41, and guides the slide shaft 156 in the range of the length w41.

  In the vicinity of the guide groove 114, a pair of escape holes 113 for loosely fitting the pair of seventh shafts 167 are provided so as to straddle the guide groove 114. The escape hole 113 has a long hole shape extending in the x-axis direction, and has an interval w31 from the seventh shaft 167.

  The distal end portion of the guide groove 114 is open on the distal end side of the region for guiding the slide shaft 156, and has the shaft guide portion 112 at the opened end. The pair of shaft guide portions 112 extend in parallel in the y-axis plus direction while maintaining the interval w21. The interval w21 is set to be, for example, about 5% larger than the diameter D2 of the shaft 900. Therefore, the pair of shaft guide portions 112 can loosely fit the shaft 900 into the gap. The distal end portion of the shaft guide portion 112 is formed so as to gradually expand from the interval w21 and draw a curve. Therefore, the tip of the shaft guide portion 112 is unlikely to damage the shaft 900 when it comes into contact with the shaft.

  Next, the front end portion of the slide member 150 will be described. The slide member 150 has a slide shaft 156, and the slide shaft 156 is engaged with the guide groove 114. Thereby, the slide shaft 156 can move linearly in the range of the length w41 in the y-axis direction. The slide shaft 156 has a bowl-shaped second holding portion 155 at the top (z-axis plus direction side). The second holding portion 155 has a function of holding the axial direction of the E-shaped retaining ring 800.

  The slide member 150 has a pair of escape holes 153 in the vicinity of the slide shaft 156 in which the pair of seventh shafts 167 are loosely fitted. The escape hole 153 has a size that does not hinder the movement of the seventh shaft 167 in the x-axis direction. Accordingly, the seventh shaft 167 and the escape hole 153 have a distance w31 in the x-axis direction. On the other hand, the escape hole 153 has a size that does not hinder the movement of the slide shaft 156 in the y-axis direction. Accordingly, the seventh shaft 167 and the escape hole 153 have a distance w41.

  The slide member 150 has a contact portion 154 at the tip. The contact portion 154 is positioned between the pair of shaft guide portions 112 so as to contact the shaft 900 and is displaced along the gap between the shaft guide portions 112. The slide member 150 is biased in the negative y-axis direction (direction F3) by the coil spring 199. Further, the slide member 150 has a structure capable of being displaced in the y-axis plus direction (direction F2) against the urging force of the coil spring 199.

  Next, the E-type retaining ring 800 will be described. The E-shaped retaining ring 800 is a metal plate having a hollow disk shape and having an opening 800a. The E-shaped retaining ring 800 has a pair of end portions 800b that form an opening 800a. The E-shaped retaining ring 800 is inserted into a shaft having a circumferential groove from the radial direction of the shaft so that the opening 800a is expanded in the elastic region. Further, the E-shaped retaining ring 800 is removed while being deformed so as to expand the opening 800a in the radial direction of the shaft. The removed E-shaped retaining ring 800 may be plastically deformed when it is deformed to expand the opening 800a. For this reason, the E-shaped retaining ring that has been plastically deformed when removed is not reused.

  Based on the structure of the E-shaped retaining ring removal tool 100 described above, the operation for removing the E-shaped retaining ring 800 inserted into the shaft 900 will be described below.

  When removing the E-shaped retaining ring 800 from the shaft 900, the user inserts the tip of the E-shaped retaining ring removal tool 100 into the shaft 900. First, the user inserts the tip of the E-shaped retaining ring removal tool 100 into the shaft 900 on the negative side of the Z-axis from the E-shaped retaining ring 800.

  The distance w11 between the tips of the extraction pieces 140 is smaller than the outer diameter D1 of the shaft 900. However, the flange portion 144 has a shape that gradually increases from the interval w11 toward the tip, and the flange portion 144 is deformed in the direction F1. Therefore, when the tip of the E-shaped retaining ring removal tool 100 is pressed against the shaft 900, the interval w11 between the pair of flanges 144 that are in contact with the shaft 900 widens away from each other, and after passing through the shaft 900, the interval w11 again. Return to the position. Further, the distance w21 between the pair of shaft guide portions 112 of the gripping member 110 is configured to loosely fit the outer diameter D1 of the shaft 900. Therefore, by this operation, the tip end portion of the E-shaped retaining ring removal tool 100 is in a state in which the shaft 900 is loosely fitted.

  Next, the user moves the E-shaped retaining ring removal tool 100 to the position where the shaft guide portion 112 contacts the E-shaped retaining ring 800 and the E-shaped retaining ring 800 is loosely fitted to the retaining ring loosely fitting portion 143. Move in the plus direction. When the user loosely fits the retaining ring loose fitting portion 143 and the E-shaped retaining ring 800, the pair of end portions 800b of the E-shaped retaining ring 800 and the pair of flange portions 144 are positioned in the vicinity. Do the work as you want.

  When the tip of the E-type retaining ring removal tool 100 is inserted into the shaft 900, if the z-axis minus side of the shaft 900 is in an open state, the flange 144 is not allowed to pass through, and the clearance between the shaft guide portion 112 is removed. It may be inserted directly into the shaft 900. In this case, the user may move the E-shaped retaining ring removal tool 100 as it is in the z-axis plus direction and move it to a position where the E-shaped retaining ring 800 and the retaining ring loose fitting portion 143 are loosely fitted.

  Next, a state in which the E-shaped retaining ring removal tool 100 is mounted on the shaft 900 will be described with reference to FIG. FIG. 4 is a diagram illustrating a state where the E-type retaining ring removal tool 100 according to the first embodiment is attached to the shaft.

  In FIG. 4, the shaft 900 is loosely fitted to the shaft guide portion 112, and the E-shaped retaining ring 800 is loosely fitted to the retaining ring loosely fitting portion 143. In FIG. 4, the E-shaped retaining ring 800 is located in the region of the thickness of the extraction piece 140. At this time, when the E-shaped retaining ring 800 is pressed in the y-axis plus direction, the contact portion 154 and the shaft 900 have a gap H1.

  After the state shown in FIG. 4 is reached, the user operates the operation lever 120 so that the grip portion 111 and the operation portion 121 approach each other. As a result, the slide member 150 moves against the biasing force of the coil spring 199 and moves in the y-axis plus direction (direction F2), and the contact portion 154 approaches the shaft 900.

  Next, a state where the contact portion 154 contacts the shaft 900 will be described with reference to FIG. FIG. 5 is a diagram of a state in which the slide member of the E-shaped retaining ring removal tool 100 attached to the shaft is in contact with the shaft.

  The contact portion 154 contacts the shaft 900 and applies a force in the direction F2 to the shaft 900. Therefore, the shaft 900 receives a force in the direction F2 from the contact portion 154. When the shaft 900 is fixed, the slide member 150 stops the displacement while receiving the reaction force of the force in the direction F2 from the shaft 900. Then, in the E-type retaining ring extraction tool 100, the portion excluding the slide member 150 starts to be displaced in the direction F3. Therefore, the end portion 800 b of the E-shaped retaining ring 800 abuts on the flange end portion 144 a that is a contact point with the flange portion 144.

  Even after the E-shaped retaining ring 800 comes into contact with the flange end portion 144a, the user continues the operation of bringing the grip portion 111 and the operation portion 121 close to each other. Then, the E-shaped retaining ring 800 that receives the force in the direction F3 from the flange end 144a starts to move in the direction F3 that is removed from the shaft 900. At this time, the first holding portion 145 is in a state in which the axial direction of the E-shaped retaining ring 800 is retained, and maintains this until the removal of the E-shaped retaining ring 800 is completed.

  Next, a state where the E-shaped retaining ring removal tool 100 removes the E-shaped retaining ring will be described with reference to FIG. FIG. 6 is a view showing a state in the middle of the removal of the E-shaped retaining ring by the E-shaped retaining ring removal tool 100. FIG.

  The user continues the operation of bringing the grip unit 111 and the operation unit 121 close to each other. Therefore, the portion of the E-shaped retaining ring extraction tool 100 excluding the slide member 150 continues to be displaced in the direction F3. Therefore, the end portion 800b of the E-shaped retaining ring 800 receives a force in the direction F3 from the flange end portion 144a. Accordingly, the E-shaped retaining ring 800 starts to be displaced in the direction F3 while being deformed in the direction F1 in which the end portions 800b are separated from each other.

  As the end portion 800b of the E-shaped retaining ring 800 is deformed so as to be separated from each other, the flange portion 144 is also displaced in the direction F3 while being deformed so as to follow the deformation of the E-shaped retaining ring 800. At this time, the seventh shaft 167 is displaced in the direction F1 and the direction F3 following the flange 144, and the escape hole 113 and the escape hole 153 do not hinder the movement of the seventh shaft 167.

  The user continues this operation until the removal of the E-shaped retaining ring 800 is completed. As a result, the E-shaped retaining ring 800 is displaced in the direction F3 while the end portions 800b expand away from each other along the shape of the groove portion of the shaft 900. When the contact portion with the shaft 900 exceeds the diameter of the shaft 900, the end portion 800b of the E-shaped retaining ring 800 approaches each other due to the restoring force of the E-shaped retaining ring 800 itself or the restoring force of the removal piece 140. It is displaced in the direction F3 along the shape of the groove of the shaft 900.

  Next, a state where the E-shaped retaining ring removal tool 100 has completed the removal of the E-shaped retaining ring 800 will be described with reference to FIG. FIG. 7 is a view showing a state where the E-shaped retaining ring removal tool 100 has completed the removal of the E-shaped retaining ring.

  The user continues the operation of bringing the grip unit 111 and the operation unit 121 close to each other. Therefore, the portion of the E-shaped retaining ring extraction tool 100 excluding the slide member 150 continues to be displaced in the direction F3. As the user continues such an operation, the E-shaped retaining ring 800 is displaced to the position shown in FIG.

  In the position shown in FIG. 7, the E-shaped retaining ring 800 is disengaged from the groove portion of the inserted shaft 900. Further, the slide shaft 156 is in contact with the E-shaped retaining ring 800. That is, the E-shaped retaining ring 800 is held in the radial direction by the pair of flange end portions 144a and the slide shaft 156 of the E-shaped retaining ring extraction tool 100. Further, the second holding portion 155 provided on the top of the slide shaft 156 reaches a position where it overlaps with the E-shaped retaining ring 800. Thus, the E-shaped retaining ring 800 is held by the pair of first holding portions 145 and the second holding portion 155 in the z-axis plus direction. Further, the E-shaped retaining ring 800 is held by the pair of shaft guide portions 112 extending inward from the outer diameter of the E-shaped retaining ring 800 in the z-axis minus direction. Thus, the E-shaped retaining ring removal tool 100 prevents the removed E-shaped retaining ring 800 from unintentionally falling off the E-shaped retaining ring removal tool 100.

  At the position shown in FIG. 7, the E-shaped retaining ring 800 and the slide shaft 156 abut. As a result, the user stops the operation of bringing the grip portion 111 and the operation portion 121 closer. The user can move the E-type retaining ring removal tool 100 away from the shaft 900 while maintaining the relative position between the grip portion 111 and the operation portion 121. Thereby, the E-shaped retaining ring removal tool 100 can maintain the state of holding the removed E-shaped retaining ring.

  Next, a state where the E-shaped retaining ring removal tool 100 holds the removed E-shaped retaining ring 800 will be described with reference to FIG. FIG. 8 is a view showing a state in which the E-shaped retaining ring removal tool 100 holds the removed E-shaped retaining ring. FIG. 8 shows a cross section taken along line VIII in FIG.

  As shown in FIG. 8, the E-shaped retaining ring 800 is held by the flange end 144a and the slide shaft 156 in the radial direction (y-axis direction). Further, the E-shaped retaining ring 800 is held by the first holding portion 145, the second holding portion 155, and the shaft guide portion 112 in the axial direction (z-axis direction). More specifically, the 1st holding | maintenance part 145 and the 2nd holding | maintenance part 155 hold | maintain the E-shaped retaining ring 800 so that the falling to the z-axis plus direction side may be prevented. Further, the shaft guide portion 112 holds an E-shaped retaining ring 800 so as to prevent the shaft guide portion 112 from falling off in the z-axis minus direction side.

  Thus, the E-shaped retaining ring removal tool 100 is configured to securely hold the removed E-shaped retaining ring.

  Next, the configuration in the axial direction of the tip of the E-shaped retaining ring removal tool 100 will be described with reference to FIG. In FIG. 8, the plate-like extraction piece 140 has one main surface (also referred to as a first main surface) in contact with the gripping member 110 on the z-axis negative direction side. Further, the removal piece 140 has no member or the like in contact with the other main surface (also referred to as a second main surface) in the z-axis plus direction. Moreover, the 1st holding | maintenance part 145 and the 2nd holding | maintenance part 155 are comprised so that it may not protrude from the main surface (2nd main surface) of the z-axis plus direction side of the extraction piece 140. FIG.

  With such a configuration, the E-type retaining ring removal tool 100 can increase the degree of freedom of work.

  Next, the operation of releasing the E-shaped retaining ring 800 extracted by the E-shaped retaining ring extraction tool 100 will be described with reference to FIG. FIG. 9 is a diagram illustrating an operation of releasing the E-shaped retaining ring extracted by the E-shaped retaining ring extraction tool 100.

  The user loosens the force for gripping the grip portion 111 and the operation portion 121 and releases the force for gripping the operation portion 121 while holding the grip portion 111. Then, the slide member 150 is displaced in the y-axis minus direction by the biasing force of the coil spring 199. As a result, the slide shaft 156 is separated from the E-shaped retaining ring 800 held between the pair of flange portions 144 and the slide shaft 156. Therefore, the E-shaped retaining ring 800 is released from the restriction in the radial direction. Further, when the slide shaft 156 is displaced in the negative y-axis direction, the second holding portion 155 is separated from the E-shaped retaining ring 800. As a result, the E-shaped retaining ring 800 is released from the restriction in the z-axis plus direction.

  As described above, the E-type retaining ring 800 is released from holding in the radial direction and the axial direction. Therefore, when the user turns the extraction piece 140 side of the E-shaped retaining ring extraction tool 100 downward, the E-shaped retaining ring 800 falls off the E-shaped retaining ring extraction tool 100. The user can release the E-shaped retaining ring 800 from the E-shaped retaining ring removal tool 100 by releasing the operation unit 121 in this way. With such a configuration, the E-shaped retaining ring removal tool 100 can hold the removed E-shaped retaining ring to a desired position and remove it appropriately. Thereby, it is possible to prevent the removed E-shaped retaining ring from being unintentionally scattered.

  As mentioned above, although Embodiment 1 was demonstrated, the structure of the E-shaped retaining ring extraction tool 100 is not restricted to the above-mentioned thing. For example, the slide member 150 may be provided between the grip member 110 and the extraction piece 140. In this case, for example, the slide member 150 has a hole for escaping the fifth shaft 165. Further, the fifth shaft 165 has a stepped portion that allows the slide member 150 to slide without rattling, and the removal piece 140 is fixed to the stepped portion so that the movement of the slide member 150 is not hindered. In addition, with such a configuration, the slide member 150 realizes a stable slide operation between the grip portion 110 and the removal piece 140. Further, in this case, the abutting portion 154 may not be erected from the slide member 150 and may be within the thickness of the plate member of the slide member 150.

  Further, the E-type retaining ring removal tool 100 may be configured such that the operation lever 120 and the slide member 150 are linked by a cam structure instead of the connecting member 130. In this case, for example, the operation lever 120 has a cam groove whose distance from the first hole 181 gradually changes around the first hole 181, and the slide member 150 has a shaft that engages with the cam groove.

  With the configuration described above, the E-type retaining ring extraction tool 100 according to the first embodiment can stably perform a series of operations for removing the E-type retaining ring from the shaft, and can be performed by the user who uses the tool. The load can be reduced.

<Embodiment 2>
Next, Embodiment 2 will be described with reference to FIGS. 10 and 11. FIG. 10 is an overview of the E-shaped retaining ring extraction tool 200 according to the second embodiment. The E-type retaining ring extraction tool 200 according to the second embodiment is different from the E-type retaining ring extraction tool 100 according to the first embodiment in the form of a gripping portion. The E-shaped retaining ring removal tool 200 according to the second embodiment is suitable for a relatively small E-shaped retaining ring compared to the E-shaped retaining ring removal tool 100 according to the first embodiment, and is similar to a stapler. It constitutes a mode of use. The E-type retaining ring removal tool 200 includes a gripping member 210, an operation lever 220, a connecting member 130, a removal piece 140, and a slide member 150 as main components.

  The gripping member 210 is a plate-like member, and a pair of shaft guide portions 112 are provided at the tip portion. Further, the distal end portion of the gripping member 210 is engaged with the removal piece 140 and the slide member 150.

  The gripping member 210 has a gripping portion 211 on the side opposite to the tip side where the shaft guide portion 112 is provided. The gripping member 210 has a first shaft 161 at an intermediate portion that is a portion between the shaft guide portion 112 and the gripping portion 211. The gripping portion 211 extends in parallel with the elongated tip portion having the shaft guide portion 112 so as to be rotationally symmetric with respect to the first shaft 161, and the first tip portion 211e which is one end portion is , And extends to a predetermined position between the shaft guide portion 112 and the first shaft 161. Further, the other end of the gripping portion 211 is formed in a U shape so as to surround the first shaft 161. The shape and size of the gripping portion 211 are set so that the user can easily grip the gripping portion 211 so as to wrap the gripping portion 211 with the palm of the hand.

  One end of the operation lever 220 is pivotally supported by the first shaft 161. The operation lever 220 has an operation unit 221 on the other end side. The operation portion 221 extends so as to form a predetermined angle Y within 90 degrees with a portion extending from the vicinity of the first shaft 161 toward the distal end side of the gripping member 210. The angle Y is, for example, 40 degrees. The E-shaped retaining ring removal tool 200 is formed so that the user can grip the grip portion 211 other than the thumb and operate the operation portion 221 using the thumb. It is preferable that the grip part 211 and the operation part 221 have a length that is easy for the user to operate. As described above, the operation lever 220 of the E-shaped retaining ring extraction tool 200 according to the second embodiment extends toward the distal end side of the E-shaped retaining ring extraction tool 200 with respect to the first shaft 161 that is a rotation fulcrum.

  The configuration of the extraction piece 140, the slide member 150, and the connecting member 130 is the same as that of the E-type retaining ring extraction tool 100 according to the first embodiment.

  With the above-described configuration, the E-shaped retaining ring removal tool 200 can operate as follows. The operation lever 220 rotates in a direction A1 in which the first tip portion 211e of the grip portion 211 and the tip portion 221e of the operation portion 221 approach each other. When the operation lever 220 rotates in the direction A1, the connecting member 130 transmits the displacement of the operation lever 220 to the slide member 150. As a result, the slide member 150 is displaced in a direction B <b> 1 parallel to the longitudinal direction of the gripping member 210 and approaching the shaft guide portion 112.

  On the other hand, the E-shaped retaining ring removal tool 200 can also operate as follows. The operation lever 220 rotates in a direction A2 in which the first tip portion 211e of the grip portion 211 and the tip portion 221e of the operation portion 221 are separated from each other. When the operation lever 220 rotates in the direction A <b> 2, the connecting member 130 transmits the displacement of the operation lever 220 to the slide member 150. As a result, the slide member 150 is displaced in a direction B <b> 2 parallel to the longitudinal direction of the gripping member 210 and away from the shaft guide portion 112. That is, the connecting member 130 converts the displacement in the rotation direction of the operation lever 220 that is the operation member and the displacement in the linear movement direction of the slide member 150.

  Next, details of each configuration of the E-shaped retaining ring removal tool 200 will be described with reference to FIG. FIG. 11 is an exploded perspective view of the E-shaped retaining ring removal tool 200 according to the second embodiment. Details of each part will be described below.

  The holding member 210 is a plate-like member, and is formed by press molding a metal plate. As with the gripping member 210 described in the first embodiment, the gripping member 210 has a shaft guide portion 112 formed on one end side, has a first shaft 161 at an intermediate portion, and is in the vicinity of the first shaft 161. And a sixth shaft 166 that engages with the coil spring 199. However, the gripping member 210 in the E-shaped retaining ring removal tool 200 is different from the gripping member 210 described in the first embodiment in the shape of the gripping portion.

  As described with reference to FIG. 10, the gripping portion 211 extends in parallel with the distal end portion having the elongated shaft guide portion 112 so as to be a rotation target with respect to the first shaft 161. The end portion extends to a predetermined position between the shaft guide portion 112 and the first shaft 161. Further, the other end of the gripping portion 211 is formed in a U shape so as to surround the first shaft 161. The gripping portion 211 is formed by covering the end portion of the metal plate that is the main surface of the gripping member 210 with resin, rubber, elastomer, or the like to the extent that the user can easily grip it. The gripping portion 211 illustrated in FIG. 11 covers the end of the main surface of the gripping member 210, and is erected in a band shape with a predetermined width (for example, about 1 centimeter) in the vertical direction on both sides of the main surface. Yes.

  The operation lever 220 is a plate-like member whose main surface has an L shape. Of the two arms extending in an L shape, a second hole 282 is formed in the vicinity of one end, and a first hole 281 is formed in the bent portion. In addition, an operation portion 221 is formed from the vicinity of the bent portion to the tip on the side opposite to the side where the second hole 282 is formed. The operation lever 220 is formed by press molding a metal plate.

  The operation unit 221 is a part that is directly touched when the user operates the E-shaped retaining ring removal tool 200, and is provided so as to form a surface in a direction perpendicular to the main surface. The operation unit 221 is covered with, for example, resin, rubber, or elastomer. The operation lever 220 illustrated in FIG. 11 is formed on the assumption that the user's thumb operates by pressing the operation unit 221. For this reason, the operation unit 221 illustrated in FIG. 11 has a concave shape that fits moderately when the abdomen of the thumb is placed. As described in Embodiment 1, the position of the second hole 282 is preferably set so that the displacement of the second hole 282 is along the longitudinal direction of the tip portion having the shaft guide portion 112.

  With the above configuration, the E-shaped retaining ring removal tool 200 according to the second embodiment stabilizes a series of operations when removing a small-diameter E-shaped retaining ring from the shaft as compared with the first embodiment. It is possible to reduce the burden on the user who uses the extraction tool. As in the case of the first embodiment, the slide member 150 of the E-shaped retaining ring extraction tool 200 may be provided between the gripping member 110 and the extraction piece 140.

<Embodiment 3>
Next, a third embodiment will be described. The third embodiment is different from the above-described embodiment in that a slide member 350 including a escape hole 353 and a stopper 353s is provided instead of the escape hole 153 included in the slide member 150.

  When the user removes the E-shaped retaining ring from the shaft using the E-shaped retaining ring removal tool, the user removes the end portion 800b of the E-shaped retaining ring 800 and the collar end portion 144a of the collar portion 144. It is necessary to perform the work of making contact. However, even if this operation is not performed reliably and the heel end portion 144a and the end portion 800b of the E-shaped retaining ring 800 are not properly in contact with each other, the user can remove the E-shaped retaining ring removal tool. May be operated. In such a case, when the collar portion 144 rides on the outer diameter portion of the E-shaped retaining ring, the bifurcated collar portion 144 is greatly expanded, and the removal piece 140 may be deformed. The third embodiment has a configuration for suppressing the breakage of the E-type retaining ring removal tool in such an abnormal state.

  FIG. 12 is a diagram illustrating the shape of the escape hole of the slide member included in the E-shaped retaining ring removal tool according to the third embodiment. An E-shaped retaining ring removal tool 300 according to the third embodiment includes a slide member 350 instead of the slide member 150 included in the E-shaped retaining ring removal tools 100 and 200 described above. The slide member 350 has a clearance hole 353.

  The escape hole 353 is a hole through which the seventh shaft 167 is inserted, like the escape hole 153 according to the first and second embodiments. However, the escape hole 353 is different from the escape hole 153 according to the first and second embodiments in that it has a stopper 353s. In the following description, the seventh axis is also referred to as a buttocks slide axis.

  The stopper 353 s is set so as to prevent the collar part and the contact part from approaching each other by contacting the collar slide shaft under a preset condition. The preset condition is that when the E-type retaining ring removal tool is attached to the shaft into which the E-type retaining ring is inserted and the collar portion 144 and the contact portion 154 are operated so as to approach each other, This is a case where at least one of the portions 144 is displaced along the outer diameter portion of the E-shaped retaining ring. In this case, the stopper 353 s contacts the seventh shaft 167 (the collar slide shaft) before the distance between the abutting section 154 and the collar 144 reaches half of the outer diameter of the shaft. It is set so as to prevent the contact portions from approaching each other.

  As shown in the figure, the escape hole 353 has a shape in which a part of a substantially rectangular hole shape protrudes inward. This protruding portion corresponds to the stopper 353s. The escape hole 353 has a narrow width in the x-axis direction corresponding to the stopper 353s, and has a width W30 at the narrowest portion, that is, the tip of the stopper 353s. The width W30 is wider than the seventh shaft 167. Therefore, when the E-shaped retaining ring removal tool 300 normally performs the operation of removing the E-shaped retaining ring, the escape hole 353 does not prevent the seventh shaft 167 from sliding.

  A distance W31 is from the center line in the width direction (x-axis direction) of the slide member 350 to the tip of the stopper 353s. The distance W31 is set so that the seventh shaft 167 and the tip of the stopper 353s come into contact with each other when the removal operation is performed with the flange 144 riding on the outer diameter portion of the E-shaped retaining ring. . Further, the distance W31 is set so that the seventh shaft 167 and the tip of the stopper 353s do not come into contact with each other and the space of the width W30 of the escape hole 353 described above is passed when the removal operation is normally performed. ing.

  Next, the function of the stopper 353s will be described with reference to FIG. FIG. 13 is a diagram illustrating an example of an abnormal use state of the E-type retaining ring removal tool. In the figure, the E-shaped retaining ring removal tool 300 is in a state where the removal operation is started without the E-shaped retaining ring 800 being correctly mounted because the opening 800a of the E-shaped retaining ring 800 is rotated to the left. is there.

  In such a situation, the contact portion 154 contacts the shaft 900, and accordingly, the portion excluding the slide member 350 continues to be displaced in the direction F3. Of the left and right collars 144, the left collar 144 is not in contact with the E-shaped retaining ring 800. Therefore, the left flange 144 continues to be displaced in the direction F3. On the other hand, the right collar portion 144 is in contact with the outer diameter portion of the E-shaped retaining ring 800. Therefore, as the extraction piece 140 is displaced in the direction F3, the collar end portion 144a is pushed and expanded in the direction F1. Therefore, the flange end portion 144a is displaced in the direction F4 along the outer diameter portion of the E-shaped retaining ring 800.

  Moreover, the 7th axis | shaft 167 is also displaced to the direction F4 with the displacement of the collar end part 144a. The seventh shaft 167 contacts the stopper 353s. When the seventh shaft 167 abuts against the stopper 353s, the relative displacement between the slide member 350 and the removal piece 140 is prevented. That is, the stopper 353 s prevents the flange portion 144 and the contact portion 154 from approaching each other by contacting the seventh shaft 167.

  In the illustrated situation, the contact portion 154 and the flange portion 144 are at a distance H30. At this time, the center of the seventh shaft 167 is located on the y-axis plus side from the tip of the stopper 353s. That is, the seventh shaft 167 is before passing through the tip of the stopper 353s. At this time, the distance from the center line of the slide member 350 to the outside of the seventh shaft 167 is a distance W32. The distance 32 is larger than the distance W31 from the center line of the slide member 350 to the tip of the stopper 353s. Since the seventh shaft 167 and the stopper 353s are in such a positional relationship, the seventh shaft 167 contacts the stopper 353s. Further, after the seventh shaft 167 and the stopper 353s contact each other, the extraction piece 140 cannot move in the direction F3.

  The distance H30 between the contact portion 154 and the flange portion 144 in a state where the seventh shaft 167 is in contact with the stopper 353s is set to be longer than one half of the outer diameter D1 of the shaft 900. Yes. The distance H30 is preferably about the same length as the outer diameter D1 of the shaft 900. By setting in this way, it is possible to reliably suppress the plastic deformation of the arm portion 142 of the extraction piece 140 beyond the elastic region.

  In this way, the stopper 353s prevents the flange portion 144 from expanding further in the direction F1 and the arm portion 142 from being plastically deformed. Therefore, the E-shaped retaining ring removal tool 300 according to the third embodiment can suppress the destruction of the E-shaped retaining ring removal tool in a state where the E-shaped retaining ring is not normally mounted.

  Next, the case where the E-shaped retaining ring removal tool 300 operates normally will be described with reference to FIG. FIG. 14 is a diagram illustrating an example of a normal use state of the E-shaped retaining ring removal tool according to the third embodiment.

  As shown in the figure, in the E-shaped retaining ring removal tool 300, the two flange end portions 144a are in contact with the end portions 800b of the E-shaped retaining ring 800, respectively. Therefore, as described in Embodiment 1, the E-shaped retaining ring removal tool 300 moves the E-shaped retaining ring 800 in the direction F3 while expanding the opening of the E-shaped retaining ring 800. Further, as the end portions 800b of the E-shaped retaining ring 800 are deformed so as to be separated from each other, the flange portions 144 are also displaced so as to be separated from each other and are displaced in the direction F3.

  In the illustrated situation, the contact portion 154 and the flange portion 144 are at a distance H30. At this time, the center of the seventh shaft 167 is located on the y-axis plus side with respect to the tip of the stopper 353s. That is, the seventh shaft 167 is before passing through the tip of the stopper 353s. At this time, the distance from the center line of the slide member 350 to the outside of the seventh shaft 167 is a distance W33. The distance 33 is smaller than the distance W31 from the center line of the slide member 350 to the tip of the stopper 353s. Since the seventh shaft 167 and the stopper 353s are in such a positional relationship, the seventh shaft 167 does not contact the stopper 353s and moves in the direction F3.

  The seventh shaft 167 is displaced along the locus T1 after the situation shown in the drawing. In the figure, the position 167a, the position 167b, and the position 167c of the seventh shaft 167 are shown along the trajectory T1. Hereinafter, the movement of the seventh shaft 167 will be described along the arrow of the trajectory T1.

  The seventh shaft 167 moves from the upper side (y-axis plus side) to the lower side (y-axis minus side) of the escape hole 353 along the direction F3 substantially parallel to the y-axis, and is a position 167a indicated by a broken line in the drawing. Reach. That is, the seventh shaft 167 passes through the tip of the stopper 353s without exceeding the distance W31.

  Next, the seventh shaft 167 moves along a gently curved locus from the position 167a to the position 167b. At this time, the seventh shaft 167 depicts a locus along which the end portion 800b of the E-shaped retaining ring 800 advances in the minus direction of the y-axis while leaving the shaft 900 once. As shown in the figure, the seventh shaft 167 in this section exceeds the distance W31, but this time is after passing through the stopper 353s. Therefore, the movement of the seventh shaft 167 is not blocked by the stopper 353s.

  Next, the seventh shaft 167 moves along a gently curved locus from the position 167b to the position 167c. This section is after the E-shaped retaining ring 800 has passed over the diameter of the shaft 900. For this reason, the collars 144 move in the y-axis minus direction while approaching each other. The position 167c is in a state where the removal operation of the E-shaped retaining ring 800 has been completed.

  Although the third embodiment has been described above, the third embodiment is not limited to the above-described configuration. For example, the slide member 350 may have a collar slide shaft corresponding to the seventh shaft 167, and the removal piece 140 may have a hole corresponding to the escape hole 353 and a convex shape corresponding to the stopper 353s.

  As described above, according to the third embodiment, a series of operations for removing the E-shaped retaining ring from the shaft can be stably performed, and the load on the user who uses the tool is reduced and the tool is destroyed. It is possible to provide an E-shaped retaining ring removal tool that suppresses the above.

  Note that the present invention is not limited to the above-described embodiment, and can be changed as appropriate without departing from the spirit of the present invention.

100, 200, 300 E-type retaining ring removal tool 110, 210 Grip member 111, 211 Grip portion 112 Axis guide portion 113 Escape hole 114 Guide groove 115 Guide hole 120, 220 Operation lever 121, 221 Operation portion 130 Connecting member 135 Spacer 140 Extraction piece 142 Arm part 143 Retaining ring free fitting part 144 Gutter part 145 First holding part 150, 350 Slide member 153, 353 Escape hole 353s Stopper 154 Abutting part 155 Second holding part 156 Slide shaft 161 First axis 181 First Hole 800 E-type retaining ring 900 shaft

Claims (11)

An E-shaped retaining ring removal tool for removing the E-shaped retaining ring from the radial direction with respect to the shaft into which the E-shaped retaining ring is inserted,
One end side has a pair of shaft guide parts bifurcated so as to be freely inserted into the shaft, and the other end side has a gripping member having a gripping part,
An extraction piece having a flange for hooking an end portion of the E-shaped retaining ring to a pair of distal ends connected to the shaft guide portion and bifurcated;
A slide member having a contact portion that slidably engages with the gripping member and is displaced along a gap of the shaft guide portion branched into the bifurcated portion and contacts the shaft ;
The slide member further includes an escape hole loosely fitted to a collar slide shaft erected on the removal piece and a stopper provided in the escape hole,
The stopper is
When the E-shaped retaining ring removal tool is mounted on the shaft into which the E-shaped retaining ring is inserted, and the collar portion of the removal piece and the contact portion of the slide member are operated so as to approach each other In
When at least one of the flange portions is displaced along the outer diameter portion of the E-shaped retaining ring, the distance between the contact portion and the flange portion is ½ of the outer diameter of the shaft. Before reaching the collar slide shaft to prevent the collar and the contact part from approaching each other,
E-type retaining ring removal tool. The slide member has a slide shaft that sandwiches and holds the E-shaped retaining ring extracted from the shaft in a radial direction with a pair of the flange portions,
The E-type retaining ring extraction tool according to claim 1. The E-shaped retaining ring extraction tool according to claim 1, wherein the flange portion includes a first retaining portion that retains an axial direction of the E-shaped retaining ring. The E-type retaining ring removal tool according to any one of claims 1 to 3, wherein the slide member has a second holding portion that holds an axial direction of the E-shaped retaining ring. The extraction piece is a flat plate-shaped member, and the first main surface is in contact with the gripping member or the slide member,
The first holding part is provided so as not to protrude from the second main surface of the extraction piece,
The E-type retaining ring extraction tool according to claim 3. The extraction piece is a flat plate-shaped member, and the first main surface is in contact with the gripping member or the slide member,
The second holding part is provided so as not to protrude from the second main surface of the extraction piece,
The E-type retaining ring removal tool according to claim 4. The shaft guide portion extends inward from the outer diameter of the E-shaped retaining ring in a state of holding the E-shaped retaining ring extracted from the shaft.
The E-type retaining ring extraction tool according to any one of claims 1 to 6. An elastic body that urges the flange portion of the removal piece and the abutting portion of the slide member to be separated from each other;
The E-type retaining ring extraction tool according to any one of claims 1 to 7. An operation member having an operation portion, slidably engaged with the gripping member, and interlocking with the slide member;
The E-type retaining ring extraction tool according to any one of claims 1 to 8. The gripping member and the operation member are pivotally supported with respect to each other, and by sliding the gripping part and the operation part so as to be close to each other, the contact between the hook part of the removal piece and the slide member is achieved. Close to each other,
The E-type retaining ring extraction tool according to claim 9. One end engages with the operation member, and the other end engages with the slide member that slides in the linear motion direction, and converts the displacement of the operation member in the rotational direction and the displacement of the slide member in the linear motion direction. A connecting member;
The E-type retaining ring extraction tool according to claim 10.

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