JP7433069B2 - C-type retaining ring installation jig and C-type retaining ring installation method using it - Google Patents

Description

The present disclosure relates to a C-type retaining ring attachment jig and a C-type retaining ring attachment method using the jig.

In an escalator, the steps are generally moved in a circular manner by rotating a driving sprocket by a drive unit and moving a step chain connected to the steps in a circular manner between the driving sprocket and the driven sprocket. In addition, power from the driving sprocket is transmitted to the handrail drive device to move the movable handrail in the same direction as the step at the same speed. In addition, when the steps circulate, the drive rollers provided on both sides of the tread of the step run on the drive rails, and the driven rollers provided on both sides of the tread run on the driven rails, so that the desired movement of the step can be achieved. This attitude has been realized. In escalators, as described in Patent Document 1, by arranging a C-shaped retaining ring on the outside of the drive roller and driven roller on the shaft on which the roller is attached, the drive roller and the driven roller can be prevented from falling off the shaft. is prevented.

Japanese Patent Application Publication No. 2009-221013

When the driving roller or the driven roller deteriorates due to wear or the like and needs to be replaced, the C-shaped retaining ring is attached and detached, for example, by the following method. First, the rollers 11 are made visible by removing the skirt guards provided on the sides of the steps or, as shown in FIG. 3, by removing the bottom plate of the landing located on the lower side of the escalator. Thereafter, as shown in FIG. 3, a mirror 14 is placed on the outside of the roller 11, so that the outer surface of the roller 11 shown in FIG. 4 can be viewed through the mirror 14.

After that, after confirming the positions of the pair of retaining ring holes 2, 2 of the C-type retaining ring 1 arranged on the shaft 7 using the mirror 14, insert the snap ring pliers 3 (see Fig. 6) into the retaining ring holes 2, 2. Insert the hole insertion part 6 (see FIG. 6).

Subsequently, the force from the snap ring pliers 3 is used to expand the space between the pair of retaining ring holes 2, 2, thereby expanding the diameter of the C-shaped retaining ring 1. Then, the C-shaped retaining ring 1 whose diameter has been expanded is removed from the retaining ring groove provided on the shaft 7, and then the C-shaped retaining ring 1 is pulled out from the shaft 7 to the outside. In this way, the C-shaped retaining ring 1 is removed from the shaft 7.

When the C-type retaining ring 1 is removed, the C-type retaining ring 1 is pulled outward from the shaft 7 in an unstable state where the diameter has been expanded (a state where a force is applied to return to the original diameter). Therefore, when the C-shaped retaining ring 1 is pulled out, the C-shaped retaining ring 1 tends to fly out from the snap ring pliers 3, and it may take time and effort to search for the C-shaped retaining ring 1 that has flown off.

Furthermore, in this method, the degree of diameter expansion of the C-shaped retaining ring 1 is left to the sensitivity of the operator. As a result, if the C-shaped retaining ring 1 is expanded too much and deforms plastically, the inner diameter of the C-shaped retaining ring 1 will become larger, and when it is reinstalled, there will be play between it and the shaft 7. There is a possibility that the sufficient function of the retaining ring 1 to prevent the roller from falling off may be lost.

This problem occurs not only when removing the C-shaped retaining ring 1 from the shaft 7, but also when fitting the C-shaped retaining ring 1 into the retaining ring groove of the shaft 7 after replacing the driving roller or the driven roller. In such a background, if the C-type retaining ring 1 can be fitted into the retaining ring groove of the shaft 7 reliably, safely and quickly, the risk of the C-type retaining ring 1 popping out and the risk of the C-type retaining ring 1 being removed can be reduced. Not only can the risk of plastic deformation of the C-shaped retaining ring 1 be halved, but also the work to replace the roller 11 can be shortened, which is of great significance.

Next, the conventional problem will be explained in a more concise and easy-to-understand manner. FIG. 5 is a diagram illustrating the structure of the C-shaped retaining ring 1, and FIG. 6 is a diagram showing the snap ring pliers 3. Moreover, FIG. 7 is a schematic diagram illustrating the members to be used with the C-type retaining ring 1, FIG. 8 is a schematic diagram illustrating a conventional method of attaching the C-type retaining ring 1, and FIG. FIG. 2 is a schematic diagram illustrating a problem with the conventional method of attaching a C-shaped retaining ring 1. Note that in FIG. 5(a), d indicates the inner diameter of the C-shaped retaining ring 1, and in FIG. 5(b), j indicates the axial dimension of the C-shaped retaining ring 1. Further, in FIG. 8, c indicates the maximum outer diameter of the portion of the shaft 7 located on the distal end side of the shaft groove 8.

Referring to FIG. 7, the roller 11 is press-fitted onto the shaft 7 up to the shaft stepped portion 10. Thereafter, as shown in FIG. 8, the C-shaped retaining ring 1 is held in the shaft groove 8 of the shaft 7 so that the bearing 12 of the roller 11 does not come off the shaft 7. At this time, the snap ring pliers 3 shown in FIG. 6 (see also FIG. 8) are used to attach the C-shaped retaining ring 1.

Specifically, insert the pair of hole insertion parts 6 (see FIG. 8) of the snap ring pliers 3 shown in FIG. 6 into the pair of retaining ring holes 2 of the C-shaped retaining ring 1 shown in FIG. (see Figure 6). Then, the hole insertion part 6 expands around the fulcrum 5 (see FIG. 6), and the retaining ring hole 2 of the C-type retaining ring 1 expands in the direction of arrow A (see FIG. 5), and the retaining ring hole 2 of the C-type retaining ring 1 expands. The inner diameter becomes wider. Then, referring to FIG. 8, use the snap ring pliers 3 to make the inner diameter of the C-shaped retaining ring 1 wider than the shaft diameter of the shaft 7, and insert it into the shaft 7, and when the C-shaped retaining ring 1 reaches the shaft groove 8, Loosen the force you applied to grip 4. As a result, the inner diameter of the C-type retaining ring 1 is reduced to the outer diameter of the shaft groove 8 due to the elastic force of the C-type retaining ring 1, and the C-type retaining ring 1 is held within the shaft groove 8.

Against this background, as shown in FIG. 9, when working inside an escalator, the work space is narrow due to walls 13 etc. in the immediate vicinity, and the worker cannot directly see the attachment part when attaching the C-shaped retaining ring 1. There are many things. In such a work environment, a mirror 14 is used, and the worker attaches the C-shaped retaining ring 1 using snap ring pliers 3 while looking at the situation reflected in the mirror 14. In addition, the situation may be captured using a camera, and the C-shaped retaining ring 1 may be installed while viewing the video.

In such a work environment, the operator works by looking at the mirror 14 or the camera image, so the operating direction of the snap ring pliers 3 may be reversed or it may be difficult to see, and it takes time to install the C-type retaining ring 1. It takes. Furthermore, since it is not possible to directly see whether the C-shaped retaining ring 1 is securely held in the shaft groove 8, it is necessary to press the C-shaped retaining ring 1 by hand to confirm whether it is securely retained in the shaft groove 8, which is time-consuming. Furthermore, in an attempt to securely attach the C-type retaining ring 1 to the shaft 7, the retaining ring hole 2 of the C-type retaining ring 1 is made too wide than the shaft diameter of the shaft 7, and the elastic limit of the C-type retaining ring 1 is exceeded and the retaining ring 1 becomes plastic. Due to deformation, the inner diameter d of the C-shaped retaining ring 1 (see FIG. 5(a)) may become larger than the groove diameter of the shaft groove 8, and the holding force of the C-shaped retaining ring 1 may decrease. In other words, when attaching the C-shaped retaining ring 1 to the shaft 7, work efficiency and installation performance may be affected, such as the work time varying due to differences in the skill of the workers and the ease with which the C-shaped retaining ring 1 is plastically deformed. There is a problem that variations occur.

Therefore, an object of the present disclosure is to provide a C-type retaining ring installation jig and method that can easily attach a C-type retaining ring in a short time and can substantially prevent the C-type retaining ring from being plastically deformed when the C-type retaining ring is installed. It's about doing.

In order to solve the above problems, a C-type retaining ring attachment jig according to the present disclosure is a C-type retaining ring attachment jig used for attaching a C-type retaining ring to an axial groove of a shaft. an insertion guide member having a tapered outer circumferential surface portion that guides a C-shaped retaining ring and is configured of at least a part of a tapered outer circumferential surface whose diameter increases toward one side in the axial direction of the threaded hole; a through hole; a retaining ring pushing member having an opening on one side in the axial direction and a guide accommodation recess capable of accommodating all of the insertion guide members; an insertion portion inserted into the through hole; and a retaining ring pushing member that is screwed into the screw hole. a screw member having a male thread, and pressing an end face of the C-shaped retaining ring arranged so as to surround the tapered outer circumferential surface portion with an end face of the retaining ring pushing member on the opening side in the axial direction; The C-shaped retaining ring is moved to the diameter-expanding side of the tapered outer circumferential surface portion so as to widen the inner diameter of the C-shaped retaining ring.

According to the present disclosure, it is possible to substantially prevent the C-type retaining ring from jumping out into the work space when the C-type retaining ring is attached, so it does not take time to search for the C-type retaining ring. Furthermore, regardless of the skill of the operator, the insertion guide member, C-shaped retaining ring, retaining ring pushing member, and screw member can be integrated, and the insertion guide member can be pressed against the shaft end of the shaft, and the screw member can be inserted in this state. By simply tightening the retaining ring into the screw hole of the guide member, the head of the screw member can press the retaining ring pushing member toward the insertion guide member and move it toward the insertion guide member. can be inserted into the shaft groove of the shaft reliably and in a short time via the insertion guide member. Further, since the operator does not widen the C-shaped retaining ring, it is possible to prevent a reduction in holding force due to plastic deformation of the C-shaped retaining ring. Therefore, regardless of the skill of the operator, the C-shaped retaining ring can be easily attached in a short time, and plastic deformation of the C-shaped retaining ring can be substantially prevented when the C-shaped retaining ring is attached.

Further, the insertion guide member may have a single protrusion that is connected to the tapered outer circumferential surface and extends in the axial direction.

According to this configuration, when the C-shaped retaining ring is moved into the shaft groove by the retaining ring pushing member, the movement of the C-shaped retaining ring in the circumferential direction can be restricted, and the behavior of the C-shaped retaining ring can be stabilized. I can do it. Therefore, the C-shaped retaining ring can be smoothly and efficiently inserted into the shaft groove.

Further, the protrusion may have an enlarged width portion whose width increases toward one side in the axial direction.

According to this configuration, when the inner diameter of the C-shaped retaining ring expands as the C-shaped retaining ring moves to one side in the axial direction on the tapered outer peripheral surface portion, the width of the protruding portion can also be gradually widened. Therefore, the distance between the two end faces of the C-shaped retaining ring that face each other with a gap therebetween and the protrusion can be kept approximately constant even if the gap widens due to the expansion of the diameter of the C-shaped retaining ring. Therefore, while the diameter of the C-type retaining ring is expanding, the C-type retaining ring can be continuously guided by the protrusion, and the behavior of the C-type retaining ring can be continuously stabilized.

The insertion guide member has a tapered inner circumferential surface on a larger diameter side of the tapered outer circumferential surface in the axial direction, and the inner diameter of the tapered inner circumferential surface becomes larger toward the larger diameter end in the axial direction. Good too.

According to this configuration, the tapered inner peripheral surface of the insertion guide member can be pressed against the shaft end of the shaft. Therefore, the static friction force of the insertion guide member with respect to the shaft can be increased, and the insertion guide member can be kept stably stationary with respect to the shaft during the installation work of the C-shaped retaining ring.

Further, the retaining ring pushing member may have a second tapered outer circumferential surface portion whose diameter increases toward one side in the axial direction.

According to this configuration, the C-type retaining ring attachment jig can be configured to be lightweight and compact, and the C-type retaining ring attachment jig can also have good handling and operability.

Further, a method for attaching a C-type retaining ring according to the present disclosure includes a method for attaching a C-type retaining ring in which the C-type retaining ring is attached to the shaft groove of the shaft using a C-type retaining ring attachment jig according to the present disclosure. The opening of the retaining ring pushing member is inserted by inserting the screw member into the through hole and screwing the male screw into the screw hole to advance the screw member toward the insertion guide member. Press the end face of the C-shaped retaining ring arranged so as to surround the tapered outer circumferential surface part with the end face of the side so that the inner diameter of the C-shaped retaining ring is on the expanded diameter side of the tapered outer circumferential face part. After moving to spread, the screw member is further advanced toward the insertion guide member to press the end face of the C-shaped retaining ring with the end face on the opening side, thereby causing the C-type retaining ring to By moving the tapered outer circumferential surface onto the outer circumferential surface of the shaft positioned so as to be continuous with the outer circumferential surface of the insertion guide member, and further advancing the screw member toward the insertion guide member, the opening side The end face of the C-shaped retaining ring is pressed, and the C-shaped retaining ring is moved on its outer peripheral surface to the shaft groove of the shaft.

According to the present disclosure, it is possible to substantially prevent the C-type retaining ring from jumping out into the work space when the C-type retaining ring is attached, so it does not take time to search for the C-type retaining ring. Furthermore, regardless of the skill of the operator, the insertion guide member, C-shaped retaining ring, retaining ring pushing member, and screw member can be integrated, and the insertion guide member can be pressed against the shaft end of the shaft, and the screw member can be inserted in this state. By simply tightening the retaining ring into the screw hole of the guide member, the head of the screw member can press the retaining ring pushing member toward the insertion guide member and move it toward the insertion guide member. can be inserted into the shaft groove of the shaft reliably and in a short time via the insertion guide member. Further, since the operator does not widen the C-shaped retaining ring, it is possible to prevent a reduction in holding force due to plastic deformation of the C-shaped retaining ring. Therefore, regardless of the skill of the operator, the C-shaped retaining ring can be easily attached in a short time, and plastic deformation of the C-shaped retaining ring can be substantially prevented when the C-shaped retaining ring is attached.

In addition, the insertion guide member has a tapered inner circumferential surface on a larger diameter side of the tapered outer circumferential surface in the axial direction, and the inner diameter of the tapered inner circumferential surface increases as it approaches the end on the large diameter side in the axial direction. By pressing the tapered inner circumferential surface toward the outer circumferential side of the end surface of the shaft, the shaft is positioned so as to be continuous with the outer circumferential surface, and the shaft is positioned closer to the tip side than the shaft groove in the shaft. The maximum outer diameter of the portion may be less than or equal to the outer diameter of one end of the outer circumferential surface portion in the axial direction.

According to this configuration, the insertion guide member is pressed against the shaft and remains stationary relative to the shaft, and the outer peripheral surface of the shaft is continuous with the outer peripheral surface portion of the insertion guide member located at one end in the axial direction. The maximum outer diameter of the portion of the shaft located on the distal side of the shaft groove is less than or equal to the outer diameter of one end of the insertion guide member in the axial direction. Therefore, the C-shaped retaining ring pressed by the retaining ring pushing member does not get caught when moving from the insertion guide member to the shaft, and the C-shaped retaining ring can be smoothly moved from the insertion guide member to the shaft. can.

Further, in a state where the shaft is continuous with the outer peripheral surface portion and a state where the screw member is fully screwed into the screw hole, the axial direction of one end of the retaining ring pushing member in the axial direction is is located on one side in the axial direction of the retaining ring pushing member, and is located on one side in the axial direction of the retaining ring pushing member. The position on one side in the axial direction obtained by adding the thickness of the C-shaped retaining ring to the one side in the axial direction of the end of the ring is the one side in the axial direction in the shaft groove. It may be located closer to the tip of the shaft than the end.

According to this configuration, not only can the C-shaped retaining ring be reliably pressed to the shaft groove by the retaining ring pushing member, but also the C-shaped retaining ring fitted into the shaft groove can be further pressed against one side wall of the shaft groove in the axial direction. It can also be prevented. Therefore, not only can the C-type retaining ring be reliably fitted into the shaft groove, but also unnecessary pushing of the C-type retaining ring can be prevented, and damage to the C-type retaining ring due to unnecessary pushing can also be prevented. It can be prevented.

According to the C-type retaining ring installation jig and the C-type retaining ring attachment method using the same according to the present disclosure, the C-type retaining ring can be easily installed in a short time, and the C-type retaining ring can be easily attached when the C-type retaining ring is installed. Plastic deformation can also be substantially prevented.

FIG. 2 is an exploded perspective view illustrating a C-type retaining ring attachment jig according to an embodiment of the present disclosure. It is a figure which shows the said C type retaining ring installation jig in the middle of fitting a C type retaining ring into the shaft groove. FIG. 3 is a perspective view showing a state in which a mirror is placed on the outside of the roller in order to insert the hole insertion part of the snap ring pliers into the retaining ring hole of the C-shaped retaining ring. FIG. 2 is a perspective view of a structure for preventing a drive roller from falling off, which includes a shaft, a roller, and a C-shaped retaining ring. It is a figure explaining the structure of a C type retaining ring. It is a figure showing snap ring pliers. It is a schematic diagram explaining the member to which a C-type retaining ring is used. It is a schematic diagram explaining the attachment method of the conventional C type retaining ring. FIG. 2 is a schematic diagram illustrating a problem with a conventional C-type retaining ring attachment method.

Embodiments according to the present disclosure will be described in detail below with reference to the accompanying drawings. Note that when a plurality of embodiments, modifications, etc. are included below, it is assumed from the beginning that a new embodiment will be constructed by appropriately combining their characteristic parts. Furthermore, in the following embodiments, the same components are denoted by the same reference numerals in the drawings, and overlapping explanations will be omitted. Furthermore, the plurality of drawings include schematic diagrams, and the dimensional ratios of each member, such as length, width, and height, do not necessarily match between different drawings. Furthermore, among the constituent elements described below, constituent elements that are not described in the independent claim indicating the most significant concept are optional constituent elements and are not essential constituent elements. In addition, in this specification, when the word "abbreviation" is used, it is used in the same meaning as the word "roughly speaking", and the requirement "omitted" means that if a person looks roughly like... It is filled. For example, the requirement of being approximately circular is satisfied if the person looks approximately circular.

FIG. 1 is an exploded perspective view illustrating a C-type retaining ring attachment jig 40 according to an embodiment of the present disclosure. As shown in FIG. 1, the C-type retaining ring attachment jig 40 includes an insertion guide member 50, a retaining ring pushing member 70, and a screw member 90.

As shown in FIG. 1, the insertion guide member 50 has a threaded hole 51 provided with a female thread. The insertion guide member 50 guides the C-shaped retaining ring 1 and is comprised of a part of the tapered outer circumferential surface 52 whose diameter increases toward one side in the axial direction of the screw hole 51 and is included in the tapered outer circumferential surface 52. It has a tapered outer peripheral surface portion 53. The tapered outer circumferential surface 52 can be configured with, for example, an outer circumferential surface of a truncated cone.

The insertion guide member 50 has a single protruding portion 55 that is connected to the tapered outer peripheral surface portion 53 and extends in the axial direction. The protrusion 55 has a widened portion 56 whose width increases toward one side in the axial direction. The insertion guide member 50 has a tapered inner circumferential surface 58 that opens on one side (larger diameter side) in the axial direction on the larger diameter side of the tapered outer circumferential surface 52 in the axial direction. The inner diameter of the tapered inner circumferential surface 58 increases toward the end on the large diameter side in the axial direction, and is largest at the end 58a on the large diameter side in the axial direction.

The retaining ring pushing member 70 has a through hole 71. The through hole 71 extends from one end of the retaining ring pushing member 70 in the axial direction along the central axis of the retaining ring pushing member 70 to the other end. The retaining ring pushing member 70 has an opening 72 on one side in the axial direction, and further has a guide accommodation recess 73 that can accommodate the entire insertion guide member 50. In this embodiment, a portion of one axial side of the through hole 71 is included in the guide accommodation recess 73 . As shown in FIG. 1, the guide housing recess 73 has an inner surface corresponding to the outer surface of the insertion guide member 50. As shown in FIG.

The retaining ring pushing member 70 further includes a second tapered outer peripheral surface portion 76 whose diameter increases toward one side in the axial direction. The second tapered outer circumferential surface portion 76 is provided on the other axial side of the retaining ring pushing member 70, and the outer diameter of the second tapered outer circumferential surface portion 76 increases from the other axial end to the one axial side. Therefore it is getting bigger.

The screw member 90 is, for example, a bolt having a head 91 that cannot be inserted into the through hole 71. The axial length of the screw member 90 excluding the head 91 is longer than the axial length of the retaining ring pushing member 70. The screw member 90 has an insertion portion 92 that is inserted into the through hole 71 and a male screw 93 that is screwed into the screw hole 51. The male thread 93 is provided on the distal end side of the threaded member 90.

In the above configuration, for example, the C-type retaining ring 1 is inserted into the shaft groove 8 of the shaft 7 using the C-type retaining ring mounting jig 40 as follows. Specifically, first, the protruding portion 55 is fitted into the gap 35 (see FIG. 4) of the C-shaped retaining ring 1, and the C-shaped retaining ring 1 is fitted so that the inner surface of the C-shaped retaining ring 1 surrounds the end of the tapered outer peripheral surface portion 53 on the small diameter side. The mold retaining ring 1 is arranged on the end of the tapered outer circumferential surface portion 53 on the small diameter side.

Next, the shaft portion 98 of the screw member 90 is penetrated until the opening side end surface 79 of the retaining ring pushing member 70 comes into contact with the end surface 1a of the C-shaped retaining ring 1 arranged so as to surround the tapered outer peripheral surface portion 53. The screw member 90 is inserted into the hole 71, and the male screw 93 of the screw member 90 is screwed into the screw hole 51 and tightened to advance the screw member 90 toward the insertion guide member 50 in the direction shown by arrow A in FIG. In this way, the insertion guide member 50, the retaining ring pushing member 70, the screw member 90, and the C-shaped retaining ring 1 are integrated and integrated.

Next, as shown in FIG. 2, which shows the C-type retaining ring mounting jig 40 while the C-type retaining ring 1 is being fitted into the shaft groove 8, the tapered inner circumferential surface 58 is aligned with the shaft 7. By pressing the outer circumferential side 9a of the end face 9, the outer circumferential surface 77 of the shaft 7 is positioned so as to be continuous with the outer circumferential surface portion 59 of the insertion guide member 50 on one side in the axial direction. As shown in FIG. 2, when the outer circumferential side 9a of the end surface 9 of the shaft 7 has a tapered outer circumferential surface 95 whose diameter decreases as it goes toward the tip side, the inclination angle of the tapered inner circumferential surface 58 is adjusted to the tapered outer circumferential surface 95. When the inclination angle is made substantially equal to the angle of inclination of It is preferable that it can be made larger.

Next, by further tightening the male thread 93 of the screw member 90 into the screw hole 51, the end face of the C-shaped retaining ring 1 arranged so as to surround the tapered outer circumferential surface portion 53 at the end face 79 on the opening side of the retaining ring pushing member 70. By further pressing 1a, the C-shaped retaining ring 1 is moved to the expanding diameter side of the tapered outer circumferential surface portion 53 so as to widen the inner diameter of the C-shaped retaining ring 1, and then the screw member 90 is further moved toward the insertion guide member 50 side. By advancing the C-shaped retaining ring 1 , the end face 79 on the opening side presses the end face 1 a of the C-shaped retaining ring 1 , and the C-shaped retaining ring 1 is positioned so as to be continuous from the tapered outer circumferential surface portion 53 to the outer circumferential surface portion 59 of the insertion guide member 50 . on the outer circumferential surface 77 of the shaft 7.

Thereafter, by further tightening the male screw 93 of the screw member 90 into the screw hole 51, the screw member 90 is advanced toward the insertion guide member 50, thereby pressing the end surface 1a of the C-shaped retaining ring 1 with the end surface 79 on the opening side. Then, the C-shaped retaining ring 1 is moved on its outer peripheral surface 77 to the shaft groove 8 of the shaft 7, and the C-shaped retaining ring 1 is fitted into the shaft groove 8.

In this embodiment, the shaft 7 is positioned so as to be continuous with the outer peripheral surface portion 59 by pressing the tapered inner peripheral surface 58 against the outer peripheral side 9a of the end surface 9 of the shaft 7. 77 is connected to the outer circumferential surface portion 59, and the maximum outer diameter of the portion of the shaft 7 located on the distal side of the shaft groove 8 is equal to or less than the outer diameter of one end of the outer circumferential surface portion 59 in the axial direction. There is.

In addition, in this embodiment, when the shaft 7 is connected to the outer circumferential surface portion 59 and the screw member 90 is screwed into the screw hole 51 as far as possible, one of the axial directions of the retaining ring pushing member 70 is The axial position of the side end 88 coincides with the position of the distal end 8a of the shaft 7 in the shaft groove 8, or is on one side in the axial direction (the distal end of the shaft 7 is different from the distal position) located on the opposite side). In addition, when the shaft 7 is connected to the outer circumferential surface portion 59 and the screw member 90 is screwed into the screw hole 51 as far as possible, one end 88 of the retaining ring pushing member 70 in the axial direction is The position on one side in the axial direction, which is calculated by adding the thickness of the C-type retaining ring 1 to one side in the axial direction, is closer to the end 8b of the shaft 7 in the shaft groove 8 than on the other side in the axial direction. It is located at the tip.

According to the above embodiment, it is possible to substantially prevent the C-type retaining ring 1 from jumping out into the work space when the C-type retaining ring 1 is attached, so it does not take time to search for the C-type retaining ring 1. Furthermore, regardless of the skill of the operator, the insertion guide member 50 can be pressed against the end surface 9 of the shaft 7 with the insertion guide member 50, the C-shaped retaining ring 1, the retaining ring pushing member 70, and the screw member 90 integrated. By simply tightening the screw member 90 into the screw hole 51 of the insertion guide member 50 in this state, the head 91 of the screw member 90 presses the retaining ring pushing member 70 toward the insertion guide member 50 and moves it toward the insertion guide member 50. The C-shaped retaining ring 1 can be inserted into the shaft groove 8 of the shaft 7 reliably and in a short time using the retaining ring pushing member 70 via the insertion guide member 50. Furthermore, since the C-shaped retaining ring 1 is not expanded by the operator, a reduction in holding force due to plastic deformation of the C-shaped retaining ring 1 can be prevented. Therefore, the C-shaped retaining ring 1 can be easily attached in a short time regardless of the skill of the operator, and plastic deformation of the C-shaped retaining ring 1 can be substantially prevented when the C-shaped retaining ring 1 is attached.

In addition, since the insertion guide member 50 has a single protruding portion 55 that is connected to the tapered outer circumferential surface portion 53 and extends in the axial direction, the C-shaped retaining ring 1 is moved into the shaft groove 8 by the retaining ring pushing member 70. At this time, movement of the C-shaped retaining ring 1 in the circumferential direction can be restricted, and the behavior of the C-shaped retaining ring 1 can be stabilized. Therefore, the C-shaped retaining ring 1 can be smoothly and efficiently inserted into the shaft groove.

In addition, since the protruding portion 55 has an expanding width portion 56 whose width increases as it goes toward one side in the axial direction, When the inner diameter of the C-shaped retaining ring 1 expands as the C-shaped retaining ring 1 moves, the width of the protrusion 55 can also be gradually widened. Therefore, the distance between the two end faces of the C-shaped retaining ring 1 that face each other with the gap 35 interposed therebetween and the protrusion 55 can be kept approximately constant even if the gap 35 widens due to the expansion of the diameter of the C-shaped retaining ring 1. . Therefore, while the diameter of the C-type retaining ring 1 is expanding, the C-type retaining ring 1 can be continuously guided by the protrusion 55, and the behavior of the C-type retaining ring can be continuously stabilized.

In addition, the insertion guide member 50 has a tapered inner circumferential surface 58 at the end of the large diameter side of the tapered outer circumferential surface 52 in the axial direction, and the inner diameter of the tapered inner circumferential surface 58 increases as the inner diameter of the tapered inner circumferential surface 58 goes toward the large diameter side in the axial direction. Since it is large, the tapered inner circumferential surface 58 can be pressed against the end surface 9 of the shaft 7. Therefore, the static friction force of the insertion guide member 50 with respect to the shaft 7 can be increased, and the insertion guide member 50 can be stably kept stationary with respect to the shaft 7 during the installation work of the C-shaped retaining ring 1.

Further, since the retaining ring pushing member 70 has the second tapered outer circumferential surface portion 76 whose diameter increases toward one side in the axial direction, the C-type retaining ring mounting jig 40 can be configured to be lightweight and compact. The handling and operability of the C-type retaining ring mounting jig 40 can also be improved.

Further, the insertion guide member 50 is pressed against the shaft 7 and remains stationary with respect to the shaft 7, and the outer peripheral surface of the shaft 7 is connected to an outer peripheral surface portion 59 located at one end of the insertion guide member 50 in the axial direction. In this state, the maximum outer diameter of the portion of the shaft 7 located on the distal side of the shaft groove 8 is equal to or less than the outer diameter of one end of the insertion guide member 50 in the axial direction. Therefore, when the C-shaped retaining ring 1 pressed by the retaining ring pushing member 70 moves from the insertion guide member 50 to the shaft 7, the C-shaped retaining ring 1 does not get caught or the like when moving from the insertion guide member 50 to the shaft 7. can be moved smoothly.

Furthermore, in this embodiment, when the shaft 7 is connected to the outer circumferential surface portion 59 and the screw member 90 is screwed into the screw hole 51 as far as possible, the axial direction of the retaining ring pushing member 70 is The axial position of one end 88 matches the position of the distal end 8a of the shaft in the shaft groove 8, or is located on one side of the axial direction from the distal end 8a, and , the position on one side in the axial direction obtained by adding the thickness of the C-shaped retaining ring 1 to one side in the axial direction with respect to the axial position of the end 88 on the one side in the axial direction of the retaining ring pushing member 70 is the axial position. It is located closer to the tip end of the shaft 7 than one end 8b of the groove 8 in the axial direction.

Therefore, not only can the C-shaped retaining ring 1 be reliably pressed up to the shaft groove 8 by the retaining ring pushing member 70, but also the C-shaped retaining ring 1 fitted in the shaft groove 8 can be further pushed onto one side wall of the shaft groove 8 in the axial direction. It can also be prevented from being pressed. Therefore, not only can the C-shaped retaining ring 1 be reliably fitted into the shaft groove 8, but also unnecessary pushing of the C-shaped retaining ring 1 can be prevented. It can also prevent damage.

Note that the present disclosure is not limited to the above-described embodiments and their modifications, and various improvements and changes can be made within the scope of the claims of the present application and their equivalents.

For example, in this embodiment, as shown in FIG. 1, the outer circumferential surface portion 59 located on one side in the axial direction of the insertion guide member 50 is a cylindrical outer circumferential surface portion that is connected to the tapered outer circumferential surface portion 53. However, the outer peripheral surface portion located on one side in the axial direction of the insertion guide member may be included in the tapered outer peripheral surface portion.

In addition, the insertion guide member 50 has a single protrusion 55 that is connected to the tapered outer circumferential surface portion 53 and extends in the axial direction, and the protrusion 55 has a width that increases as it goes to one side in the axial direction. The case where the enlarged portion 56 is included has been described. However, the insertion guide member may have a width that does not increase toward one side in the axial direction, and may have a single protrusion that extends in the axial direction while being connected to the tapered outer circumferential surface. Alternatively, the insertion guide member may not have a single protrusion that is connected to the tapered outer circumferential surface and extends in the axial direction, and the tapered outer circumferential surface may coincide with the annular tapered outer circumferential surface.

In addition, although the insertion guide member 50 has a tapered inner circumferential surface 58 on the large diameter side of the tapered outer circumferential surface 52 in the axial direction, the insertion guide member 50 has a tapered inner circumferential surface 58 on the large diameter side of the tapered outer circumferential surface in the axial direction. The insertion guide member may not have a circumferential surface, and the inner circumferential surface on one side in the axial direction of the insertion guide member may be constituted by a cylindrical inner circumferential surface or the like.

Further, although the case has been described in which the retaining ring pushing member 70 has the second tapered outer peripheral surface portion 76 whose diameter increases as it goes to one side in the axial direction, the retaining ring pushing member 70 has a diameter that increases as it goes to one side in the axial direction. It is not necessary to have the second tapered outer circumferential surface portion that expands in diameter, and for example, the entire outer circumferential surface of the retaining ring pushing member may be constituted by a cylindrical outer circumferential surface.

In addition, when the outer circumferential surface 77 of the shaft 7 is connected to the outer circumferential surface portion 59 and the screw member 90 is screwed into the screw hole 51 as far as possible, one side of the retaining ring pushing member 70 in the axial direction The axial position of the end 88 coincides with the position of the distal end 8a of the shaft 7 in the shaft groove 8, or is on one side in the axial direction (opposite to the distal end of the shaft 7) We have explained the case where it is located on the side). However, when the outer circumferential surface of the shaft is connected to the outer circumferential surface of the insertion guide member and the screw member is tightened into the screw hole of the insertion guide member as far as possible, the axial direction of the retaining ring pushing member The axial position of one end may be located closer to the tip of the shaft 7 than the shaft groove.

In addition, when the shaft 7 is connected to the outer peripheral surface 59 of the insertion guide member 50 and the screw member 90 is screwed into the screw hole 51 as far as possible, one of the axial directions of the retaining ring pushing member 70 The one axial position obtained by adding the thickness of the C-shaped retaining ring 1 to one axial side of the side end 88 is the one axial end 8b of the shaft groove 8. The case where the shaft 7 is located closer to the tip of the shaft 7 has been described. However, when the shaft is connected to the outer peripheral surface of the insertion guide member 50 on one axial side and the screw member is partially tightened into the threaded hole of the insertion guide member, the retaining ring pushing member The axial position of the C-type retaining ring added to the axial position of one end of the shaft matches the axial end of the shaft groove. It may be possible to do so.

1 C-type retaining ring, 1a end face, 2 retaining ring hole, 3 snap ring pliers, 4 grip, 5 fulcrum, 6 hole insertion part, 7 shaft, 8 shaft groove, 9 end face, 9a outer peripheral side of end face, 10 shaft step Part, 11 Roller, 12 Bearing, 14 Mirror, 35 Gap, 40 C-type retaining ring mounting jig, 50 Insertion guide member, 51 Screw hole, 52 Tapered outer circumferential surface, 53 Tapered outer circumferential surface portion, 55 Projection portion, 56 Width enlargement portion , 58 tapered inner circumferential surface, 58a end, 59 outer circumferential surface, 70 retaining ring pushing member, 71 through hole, 72 opening, 73 guide accommodation recess, 76 second tapered outer circumferential surface, 77 outer circumferential surface of shaft, 79 retaining ring pushing part 88 one axial end of the retaining ring pushing member 70, 90 screw member, 91 head, 92 insertion portion, 93 male thread, 98 shaft portion.

Claims (8)

A C-type retaining ring installation jig used for attaching a C-type retaining ring to an axial groove of a shaft,
an insertion guide member having a tapered outer circumferential surface portion configured of at least a portion of a tapered outer circumferential surface that guides the screw hole and the C-shaped retaining ring and whose diameter increases toward one side in the axial direction of the screw hole;
a retaining ring pushing member having a through hole and a guide accommodation recess that has an opening on one side in the axial direction and is capable of accommodating all of the insertion guide members;
comprising an insertion part inserted into the through hole, and a screw member having a male thread screwed into the screw hole,
By pressing the end surface of the C-shaped retaining ring arranged so as to surround the tapered outer circumferential surface portion with the end surface of the retaining ring pushing member on the opening side in the axial direction, the C-type retaining ring is pushed into the tapered outer circumferential surface portion. A C-type retaining ring mounting jig for moving the C-type retaining ring so as to widen the inner diameter of the C-type retaining ring. The C-shaped retaining ring mounting jig according to claim 1, wherein the insertion guide member has a single protrusion that is connected to the tapered outer circumferential surface and extends in the axial direction. 3. The C-type retaining ring mounting jig according to claim 2, wherein the protruding portion has an enlarged width portion whose width increases toward one side in the axial direction. The insertion guide member has a tapered inner circumferential surface on a larger diameter side of the tapered outer circumferential surface in the axial direction,
The C-type retaining ring mounting jig according to any one of claims 1 to 3, wherein the inner diameter of the tapered inner circumferential surface increases toward the larger diameter end in the axial direction. The C-type retaining ring mounting jig according to any one of claims 1 to 4, wherein the retaining ring pushing member has a second tapered outer peripheral surface portion whose diameter increases toward one side in the axial direction. A C-type retaining ring attachment method for attaching the C-type retaining ring to the shaft groove of the shaft using the C-type retaining ring attachment jig according to any one of claims 1 to 5,
By inserting the screw member into the through hole and screwing the male screw into the screw hole, the screw member is advanced toward the insertion guide member, so that the end face of the retaining ring pushing member on the opening side , pressing the end face of the C-shaped retaining ring arranged so as to surround the tapered outer circumferential surface portion, and moving the C-shaped retaining ring toward the expanding diameter side of the tapered outer circumferential surface portion so as to widen the inner diameter of the C-shaped retaining ring; Then, by further advancing the screw member toward the insertion guide member, the end face of the C-shaped retaining ring is pressed with the end face on the opening side, and the C-shaped retaining ring is removed from the tapered outer circumferential surface. By moving the shaft onto the outer circumferential surface of the shaft positioned so as to be continuous with the outer circumferential surface of the insertion guide member, and further advancing the screw member toward the insertion guide member, the C at the end surface on the opening side is moved. A method for attaching a C-shaped retaining ring, in which the end face of the C-shaped retaining ring is pressed and the C-shaped retaining ring is moved along its outer peripheral surface to the shaft groove of the shaft. The insertion guide member has a tapered inner circumferential surface on a larger diameter side of the tapered outer circumferential surface in the axial direction,
The inner diameter of the tapered inner circumferential surface increases toward the larger diameter end in the axial direction,
By pressing the tapered inner peripheral surface toward the outer peripheral side of the end surface of the shaft, the shaft is positioned so as to be continuous with the outer peripheral surface part,
7. The C-type stop according to claim 6, wherein a maximum outer diameter of a portion of the shaft located closer to the tip than the shaft groove is equal to or less than an outer diameter of one end of the outer circumferential surface portion in the axial direction. How to install the ring. the position in the axial direction of one end of the retaining ring pushing member in the axial direction when the shaft is connected to the outer circumferential surface portion and the screw member is fully screwed into the screw hole; is located on one side in the axial direction of the retaining ring pushing member, and is located on one side in the axial direction of the retaining ring pushing member. The position on one side in the axial direction obtained by adding the thickness of the C-shaped retaining ring to the one side in the axial direction with respect to the axial position in the shaft groove is The method for attaching a C-shaped retaining ring according to claim 6 or 7, wherein the retaining ring is also located on the distal end side of the shaft.

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