JP2007298122A - E type retaining ring and tool used for this - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an E type retaining ring which is mounted to a shaft member by an easy operation without skill and a tool used for this. <P>SOLUTION: The E type retaining ring and the tool used for this are described as follows: (A) In a hollow shaft member vertical to a shaft core direction in a side view, a top hole at an upper end and a bottom hole at a lower end of which diameter is shorter than that of the top hole are provided and a line connecting centers of the top hole and the bottom hole runs through the shaft core. (B) An inserting leg at a center part, holding arms curved and provided at right and left of upper ends of the inserting leg and a small projection protruding at the upper end of the center part of the holding arms are provided for the shaft member. (C) In the inserting leg, an upper end part width can be fit to the top hole, a part lower than the upper end part is tapered, a part immediately above the lower end is slightly larger than an inner diameter of the bottom hole and a lower end part is formed in a stepped form of which width is shorter than the bottom hole. (D) The shaft member is supported as being held by the arms and engaged with the bottom holes by the lower end part and the part immediately above the lower end of the inserting leg. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an E-shaped retaining ring used for axial positioning of equipment parts mounted on a hollow shaft member for OA equipment and general equipment, and improvement of a jig used therefor.

The thing of the following patent document frequently used as the conventional E type retaining ring is shown in FIG. Here, in order to avoid confusion with the example of this invention, the code | symbol and name of each structure have changed partially with description of a patent document. The E-shaped retaining ring 5 includes an insertion leg 51 that can be inserted into the insertion hole 61 of the hollow shaft member 6, and a length that is slightly narrower than the outer diameter of the shaft member 6. A retaining ring formed in a substantially E shape with a pair of curved holding arms 52, 52 surrounding the outer periphery of the shaft, and the outer peripheral surface of the shaft member 6 near the connecting portion of the holding arms 52, 52 and the insertion leg 51. A neck holding piece 53 to be brought into contact with the projection is projected.
Japanese Patent Publication No. 3-25647

The E-type retaining ring 5 described in the above-mentioned patent document is frequently used because it can firmly secure the positioning in the axial direction of the device part M attached to the hollow shaft member 6 with a simple structure. Had the problem of.
In order to attach the E-shaped retaining ring 5 to the shaft member 6, a jig having a generally semicircular curved surface along the outer peripheral surface of the holding arms 52, 52 is used. Then, the E-shaped retaining ring 5 is fitted and human power is applied from above to insert the insertion leg 51 around the fitting hole 61 formed in the shaft member 6. At this time, it is not easy to apply a uniform pressure to the left and right, and a slight imbalance is unavoidable. Therefore, either the left or right end of the holding arms 52, 52 rubs the surface of the shaft member 6 or widens the interval between the ends. Sometimes Therefore, skill is required for this mounting work.
Further, when the insertion leg 51 is inserted into the insertion hole 61, the lower end portion thereof is in a free state with respect to the inner surface of the shaft member 6. Therefore, as shown in FIG. On the other hand, in a side view, it may be inserted with an inclination angle α rather than vertical. At that time, the side surface of the device part M mounted on the shaft member 6 does not come into close contact with the side surface of the E-shaped retaining ring 5, and the accuracy of positioning of the device component in the axial direction may be lowered.
Further, when the E-shaped retaining ring 5 attached to the shaft member 6 is detached, a normal pulling driver is inserted into the gap portion at the connecting portion between the upper end of the insertion leg 51 and the holding arms 52, 52 and pry out. However, since the neck restraining piece 53 protrudes adjacent to the gap, it may be difficult to insert the driver narrowly.
On the other hand, the present invention has no drawback due to left / right imbalance when pressurizing the jig when mounted on a hollow shaft member, and the shaft is fixed in the axial direction of the shaft member by locking with the inner surface of the shaft member of the insertion leg. It can be inserted vertically, and the thrust thrust load can be increased against the one-side thrust load generated by rotation, etc., and the driver for pulling out can be easily inserted at the time of attachment / detachment, and the mounting work to the structure and shaft member is simple An object of the present invention is to obtain an E-shaped retaining ring that overcomes the above-mentioned problems that do not require skill and a jig used therefor.

to this end,
In the first aspect of the invention, a) a top hole at the upper end and a bottom hole having a smaller diameter than the top hole at the lower end are formed, and a line connecting the center of the top hole and the bottom hole passes through the axis of the side surface. B) a hollow shaft member that is perpendicular to the axial direction when viewed; b) an insertion leg at the center, a holding arm that is curvedly disposed on the left and right of the upper end of the insertion leg, and the holding arm C) a small protrusion projecting at the upper end of the central portion, and c) the insertion leg can be fitted into the top hole at the upper end width, the lower end is tapered from the upper end portion, and the upper portion directly below the lower end is the inner diameter of the bottom hole. The lower end portion is formed in a stepped shape having a width smaller than that of the bottom hole, and d) the shaft member is held by the left and right protrusions formed on the lower inner surface of the holding arm and the The problem was solved by an E-shaped retaining ring that can be held by locking with the bottom hole by the lower end portion of the insertion leg and the upper portion of the lower end.
In the invention of claim 2, it is a jig used for mounting the E-shaped retaining ring of claim 1 to the shaft member, and is a substantially semicircular shape that opens downward on the lower surface of the block material holder. A curved surface is formed and can be fitted around the outer periphery of the holding arm of the E-shaped retaining ring. A hollow portion is provided above the curved surface, and a small protrusion can be accommodated upward from the top of the curved surface. This was solved by an E-shaped retaining ring jig having a perforated hole.
In the invention of claim 3, the E-type retaining ring jig according to claim 2 may be an E-shaped retaining ring jig having a handle fixed to the upper surface of the holder.

  According to the E-type retaining ring of the present invention and the jig used therefor, there is no defect due to left / right imbalance when pressurizing the jig at the time of mounting on the hollow shaft member, It can be inserted perpendicularly to the axial direction of the shaft member by locking, it can increase the thrust thrust load against one side thrust load generated by rotation etc., and it is easy to insert a driver for extraction at the time of desorption, The structure and the mounting work to the shaft member are simple and skill is not required.

Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a longitudinal front view of an E-type retaining ring and an attachment-related member of an example of the present invention, showing a jig, an E-shaped retaining ring, and a shaft portion.
FIG. 2 is a longitudinal front view showing a state in which the E-shaped retaining ring in FIG. 1 is attached to the shaft member. FIG. 3 is a longitudinal sectional front view and a side view showing a state where the E-type retaining ring of FIG. 1 has been attached to the shaft member.
FIG. 4 is a longitudinal sectional front view and a side view showing a state where the conventional E-type retaining ring is mounted on the shaft member.
In the following, in accordance with the mounting work of the E-shaped retaining ring to the shaft member, the shaft member is held with the insertion hole side on the upper side and the opposite side on the lower side, and the E-shaped retaining ring with the front end side of the insertion leg on the lower side. A description will be given with the connecting arm side as the top and the holding arms as the left and right with the insertion leg as the center.

An E-type retaining ring 1 according to an example of the present invention and a jig used therefor will be described with reference to FIGS.
The E-type retaining ring 1 described here is an example using a shaft member shown in FIG. 1C and a mounting jig shown in FIG.
The shaft member 2 is a hollow pipe material having an outer diameter D1 and an inner diameter D2, and has a top hole 21 having an inner diameter d1 at the upper end and an inner diameter d1 at the lower end.
A bottom hole 22 having a smaller inner diameter d2 is formed, and a line connecting the center of the top hole 21 and the bottom hole 22 passes through the axis of the shaft member 2 and is perpendicular to the axial direction in a side view. .
The E-shaped retaining ring 1 is made of a thin plate made of stainless steel, spring steel, or the like, and includes an insertion leg 11 at the center, holding arms 12 and 12 curvedly disposed on the upper left and right sides of the insertion leg 11, and holding arms 12. , 12 and a small protrusion 13 protruding upward at the upper end of the central portion. The upper end of the insertion leg 11 has an inner diameter d1 of the top hole 21.
The lower end portion 11a is slightly larger than the inner diameter d2 of the bottom hole 22, and the lower end portion 11a is slightly larger than the inner diameter d2 of the bottom hole 22. It is formed in a narrow stepped shape. When the E-type retaining ring 1 to be described later is attached to the shaft member 2, the lower end portion 11a of the insertion leg 11 inserted into the top hole 21 from above is fitted into the bottom hole 22, as shown in FIG. In addition, the upper portion of the stepped lower end is configured to abut against the bottom hole 22 and be locked. The holding arms 12 and 12 are formed such that the upper inner surface is a symmetrical semi-circular curved surface and the lower inner surface is formed by facing the left and right projecting portions 12a and 12a, and the surfaces facing the left and right projecting portions 12a and 12a. As shown in FIG. 3, when the E-shaped retaining ring 1 is mounted on the shaft member 2, the outer peripheral surface of the shaft member 2 can be firmly held.

As shown in FIG. 1A, the jig 3 includes a holder 31 and a handle 32. The holder 31 is a block material made of metal or hard plastic and thicker than the E-shaped retaining ring 1. A substantially semicircular curved surface 31 a opening downward is formed on the lower surface, and the holding arm 12 of the E-shaped retaining ring 1. 12 can be fitted around the outer periphery, a cavity 31c is provided at an upper separation position of the curved surface 31a, and the small protrusion 13 that reaches the cavity 31c left and right central portion vertically upward from the left and right central portion of the top of the curved surface 31a. A round hole 31b, which is a through hole of a size that can be stored, is formed. The round hole 31b is not necessarily a through hole as long as the small protrusion 13 can be accommodated, and may be a blind hole. Moreover, as long as the small protrusion 13 can be accommodated, it may not necessarily be a round hole but may be a hole having a shape such as another polygon.
The handle 32 is a bar-shaped material made of metal or hard plastic and is fixed above the upper surface of the holder 31, but is not an essential component.

Next, a method for attaching the E-shaped retaining ring 1 to the shaft member 2 will be described with reference to FIGS.
The small protrusion 13 of the E-shaped retaining ring 1 placed on the lower side is fitted into the round hole 31b of the jig 3 placed on the upper side, and the holding arms 12 and 12 are surrounded by the curved surface 31a so as to be mounted. The E-shaped retaining ring 1 is set on the tool 3, and it is set as the mounting preparation state shown in the upper part of FIG. At this time, the E-shaped retaining ring 1 is stably held by the jig 3 without swinging left and right by fitting the small protrusion 13 with the round hole 31b.
Next, the shaft member 2 is placed downward, and the lower end portion 11a of the insertion leg 11 is inserted into the top hole 21 to form the state shown in the lower part of FIG. Pressurize in the direction. Since the E-type retaining ring 1 is stably held by the jig 3, the pressure can be maintained evenly during pressing and without being unbalanced, and the pressing can be continued. There is no need to rub the surface of the shaft member 11 or widen the tip of the shaft member 11, and no skill is required to perform this mounting operation. When the insertion leg 11 is further pressurized to the top hole 21, the lower end portion 11 a of the inserted insertion leg 11 is fitted into the bottom hole 22, and the upper portion of the stepped lower end abuts against the bottom hole 22. Locked.
Further, when the jig 3 is detached from the E-shaped retaining ring 1 by placing a hand on the handle 32 or putting a finger in the hollow portion 31c and pulling it in the direction opposite to the arrow X direction, the E-shaped retaining ring as shown in FIG. 1 to the shaft member 2 is completed. At this time, the lower end portion of the insertion leg 11 inserted into the insertion hole 21 is locked to the inner surface of the shaft member 2, and the side surface of the E-shaped retaining ring 1 is in the axial direction of the shaft member 2 as shown in FIG. On the other hand, the side surface of the device part M mounted on the shaft member 2 is kept in close contact with the side surface of the E-shaped retaining ring 1 so that the accuracy of the positioning of the device component M in the axial direction is high. It can be secured.
In addition, the insertion leg 11 has an effect of pushing against the one-side thrust load generated by the rotation of the shaft member 2 by being locked with the inner surface of the shaft member 2, and the thrust load resistance can be increased. The E-shaped retaining ring 1 is firmly attached to the shaft member 2 together with the holding of the outer peripheral surface of the shaft member 2 by the facing surfaces of the left and right protrusions 12a, 12a.

  When the E-type retaining ring 1 attached to the shaft member 2 is attached or detached, a driver for pulling out is inserted into the gap portion in the connecting portion between the upper end of the insertion leg 11 and the holding arms 12 and 12 and is pry-off. However, the neck portion holding piece described in Patent Document 1 does not exist in the space portion, and the space portion can be sufficiently secured, and can be easily and reliably removed by inserting a driver.

  The E-type retaining ring of the present invention can be widely used as a mechanical element for axial positioning of various equipment components mounted on a hollow shaft member.

FIG. 1 is an example of an E-type retaining ring and its mounting-related member according to the present invention, wherein (a) a longitudinal front view of a jig, (b) a longitudinal front view of an E-shaped retaining ring, and (c) a shaft member to be mounted. It is a vertical front view. It is a vertical front view of the mounting start state to the shaft member of the E-shaped retaining ring of FIG. It is the (a) longitudinal front view of the completion | finish state to the shaft member of the E-shaped retaining ring of FIG. 1, and (b) side view. It is the (a) vertical front view of the completion | finish state to the shaft member of the conventional E-shaped retaining ring, and (b) side view.

Explanation of symbols

1, 5 E-shaped retaining ring 11, 51 Insertion leg 11a Lower terminal part 12, 52 Holding arm 12a Left and right protrusion part 13 Small protrusion

2, 6 Shaft member

3 Jig 31 Holder
31a Curved surface 31b Round hole 31c Cavity part 32 Handle 53 Neck part restraining piece 61 Insertion hole

X Pressure direction

M equipment parts

Claims (3)

A) A top hole at the upper end and a bottom hole having a smaller diameter than the top hole at the lower end are formed, and a line connecting the center of the top hole and the bottom hole passes through the axis and is perpendicular to the axis direction in a side view. (B) a hollow shaft member; b) an insertion leg at the center, a holding arm curvedly disposed on the left and right of the upper end of the insertion leg, and a small protrusion protruding at the upper end of the center of the holding arm C) The insertion leg has an upper end width that can be fitted into the top hole, the lower end is tapered from the upper end, and the upper portion of the lower end is slightly larger than the inner diameter of the bottom end. And the shaft member is held by the left and right projections formed on the lower inner surface of the holding arm, and the lower and lower ends of the insertion leg. An E-shaped retaining ring characterized in that the retaining ring can be held by engagement with the bottom hole by a directly upper part.
A jig used for mounting an E-shaped retaining ring to a shaft member according to claim 1, wherein a substantially semicircular curved surface opening downward is formed on a lower surface of a block material holder. The holding arm can be fitted around the outer periphery of the holding arm, a cavity is provided at an upper separation position of the curved surface, and a hole capable of accommodating a small protrusion is formed above the curved surface top. E-shaped retaining ring jig.
The E-type retaining ring jig according to claim 2, wherein a handle is fixed to the upper surface of the holder.

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