JPH0861341A - Locking ring structure - Google Patents

Abstract

PURPOSE: To provide locking ring structure capable of surely preventing the falling of a locking ring from the groove of a shaft. CONSTITUTION: A groove is formed on an outer periphery in a shaft, a locking ring (wheel ring member) 20 is fittedly mounted on the groove, and the wheel ring member has fitting part recessed part 21a and a protruded part 21b fitted each other on both the sides of an opening end. Consequently, after the wheel ring member is assembled in the groove provided on the outer periphery of the shaft, when the shaft is rotated, the expansion of the opening part of the wheel ring member due to centrifugal force is eliminated to prevent the falling of the wheel ring member from the groove of the shaft.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a locking ring fitted in a groove formed on the outer circumference of a shaft, and more particularly to a locking ring structure used for a starter used for starting an internal combustion engine.

[0002]

2. Description of the Related Art Reference number 53-06 of Nippon Denso Public Technical Report
2, a groove is provided on the outer periphery of the shaft, and the groove has a flat portion on each of the upper and lower sides, and a locking ring having a shape facing the flat portion contacts the flat portion. A locking ring fitted in the groove is disclosed. As shown in FIG. 3 of the open technical report, this locking ring is assembled by inserting the opening 1a of the locking ring 1 along the groove 2a of the shaft 2 in the direction of arrow A or B, When the flat portion 1b inside the locking ring abuts the shaft 1, the locking ring 1 is rotated 90 degrees, and the flat portion 1b of the locking ring 1 is fitted into the flat portion 2b of the groove 2a of the shaft 1. With such a configuration, the number of parts can be reduced and the number of assembling steps can be reduced as compared with a known configuration in which the C-shaped circlip is fitted in the groove of the shaft and the stop collar is press-fitted on the outside of the circlip. It is a thing.

The reference number 55-048 of Nippon Denso Koho Giho includes a wedge-shaped groove on the outer circumference of the shaft.
A starter in which a stop collar having a shape facing the wedge-shaped groove is fitted in the groove is also disclosed.

[0004]

However, in each of the above-mentioned starters, the pinion gear abuts on the locking ring because the starter is fixed to the shaft only by the locking ring, and the locking ring is set in the groove of the shaft. When the shaft is rotated at a high speed in a state where a load is applied in the axial direction, the opening of the locking ring may be expanded by the centrifugal force and fall out of the groove.

Therefore, the present invention has been made in order to solve the above problems, and an object thereof is to provide a locking ring structure capable of reliably preventing the locking ring from falling out from the groove of the shaft. .

[0006]

In order to achieve the above object, in Claim 1, a groove is formed in the outer periphery, a shaft for supporting a moving member, and a ring member fitted in the groove are provided. In the locking ring structure, there is adopted a locking ring structure characterized in that it has fitting portions that are fitted to each other on both sides of the opening end of the ring member.

According to a second aspect of the invention, in addition to the starter according to the first aspect, the engaging ring structure according to the first aspect is adopted, in which the fitting portion is an uneven portion. According to a third aspect of the present invention, in the starter according to the second aspect, the concavo-convex portions are formed so as to face each other in the axial direction of the shaft, and the concavo-convex portions of the concavo-convex portions facing each other in the axial direction thereof are opposed to each other. The widths are W1 and W2, the total width of these W1 and W2 is W, the groove width of the shaft is T, and T> W is satisfied, and the inner diameter of the ring member before fitting the concavo-convex portion is d0. The inner diameter after fitting of the concavo-convex portion of the ring member is d1, the groove diameter of the shaft is D1, the outer diameter of the shaft is D2, and before the concavo-convex portion is fitted, d0> D2, and After the fitting of the concavo-convex portion, a locking ring structure is adopted which is characterized in that D1 <d1 <D2.

According to a fourth aspect of the present invention, in the starter according to the second aspect, the concave and convex portions are formed so as to face each other in the radial direction of the shaft, and the inner diameter of the annular member before fitting into the concave and convex portions is fitted. D0, d1 after fitting the concavo-convex portion of the ring member, d1, the groove diameter of the shaft, D2 of the shaft, the axial thickness of the ring member, t, and the groove width of the shaft. T, and before fitting the concave and convex portions, d0>
D2, and after fitting the uneven portion,
A locking ring structure is adopted which is characterized in that D1 <d1 <D2 and 2t> T.

According to a fifth aspect of the present invention, in addition to the starter according to the first aspect, a guide portion for fitting the fitting portion is provided on at least one of both open ends of the ring member. The locking ring structure is adopted.

[0010]

According to the present invention, in the first aspect, the shaft is formed with the groove on the outer periphery thereof, and the groove is formed with the groove.
The ring member is fitted, and since this ring member has fitting portions that fit with each other on both sides of the open end, after mounting the ring member in the groove provided on the outer periphery of the shaft, When the shaft rotates, the opening of the ring member does not expand due to centrifugal force, and it is possible to prevent the ring member from falling out of the groove of the shaft.

According to a second aspect of the present invention, since the fitting portion is an uneven portion with respect to the locking ring structure of the first aspect, it is possible to assemble with a simple structure and surely. According to a third aspect of the present invention, in the locking ring structure of the second aspect, the concave and convex portions are formed so as to face each other in the axial direction of the shaft, and the convex and concave portions of the convex and concave portions facing each other are arranged in the axial direction. Width is W1, W
2, the total width of W1 and W2 is W, the groove width of the shaft is T, and T> W is satisfied, and the inner diameter of the ring ring member before fitting the concave and convex portion is d0, and the concave and convex portion of the ring ring member is fitted. After combining, the inner diameter is d1,
The groove diameter of the shaft is D1 and the outer diameter of the shaft is D2, so that d0> D2 is set before the fitting of the concavo-convex portion and D1 <d1 <D2 is set after the fitting of the concavo-convex portion. Therefore, the ring member can be fitted in the groove of the shaft over the convex portion of the uneven portion, and the ring member can be easily fitted to the shaft.

According to a fourth aspect of the present invention, in the locking ring structure of the second aspect, the concave and convex portions are arranged in the radial direction of the shaft.
Formed so as to face each other, the inner diameter before fitting the concavo-convex portion of the ring member is d0, the inner diameter after fitting the concavo-convex part of the ring member is d1, the groove diameter of the shaft is D1, the outer diameter of the shaft is D2, the inner ring member The axial thickness of the shaft is t, the groove width of the shaft is T, and d0> D2 before the fitting of the uneven portion, and D1 <d1 <D2 after the fitting of the uneven portion. And
Since 2t> T, the ring ring member is inserted from the shaft tip side to the groove of the shaft, and when the uneven portion is fitted in the groove of the shaft, the uneven portion of the ring ring member is distorted in the axial direction. Even if a load to do so is applied, the movement of the side wall of the groove is restricted, the fitting of the concave and convex portions does not come off, and the ring member can be reliably prevented from falling off.

According to a fifth aspect of the present invention, in addition to the locking ring structure according to the first aspect, at least one of both open ends of the ring member is provided with a guide portion into which the fitting portion is fitted. By simply tightening the outer diameter of the inner peripheral side to the inner peripheral side, one side can pass over while guiding the other side, and furthermore, it becomes easy to assemble the ring member to the shaft.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described based on an embodiment shown in FIGS. FIG. 1 is a side sectional view of a starter using the locking ring structure of the present invention, FIG. 2 is a front view of the locking ring showing a state before assembly, and FIG.
FIG. 4 is a partially enlarged front view of the locking ring showing a state before assembly, and FIG. 4 is a front view showing a state where the locking ring is assembled to the shaft.

The locking ring 20 which forms a ring member serves to regulate the movement of the pinion gear 30 which forms a moving member, and is mounted in the groove 11 formed around the shaft 10 before assembly. As shown in FIG. 2 or FIG. 3, the state is an opening ring annular shape having an opening 22. When the inner diameter of this annular ring is d0 and the outer diameter of the shaft 10 is D2, the inner diameter of the annular ring is d0 is formed to be larger than the outer diameter D2 of the shaft (d0> D2). Further, substantially S-shaped concavities and convexities 21 are formed at both ends of the locking ring 20, and when the locking ring 20 is assembled in the groove 11 of the shaft 10 which will be described later, one convex portion 21b becomes the other concave portion 21a. And the other convex portion 21b fits into the one concave portion 21a. Further, a pair of inclined surfaces 21c forming guide portions facing each other are formed at both ends of the locking ring 20.

As shown in FIGS. 3 and 4, one convex portion 2
The axial width of 1b is W1, the axial width of the other convex portion 21b is W2, the axial width of one convex portion 21b is W1, and the axial width of the other convex portion 21b is W2. Width is W (W = W
1 + W2), where T is the width of the shaft groove 11, the total width W is set smaller than the width T of the shaft groove 11.

After assembling the locking ring 20 into the groove 11 of the shaft 10, as shown in FIG.
b and the other concave portion 21a are engaged with each other to form the groove 11 of the shaft 10.
If the inner diameter of the locking ring 20 is d1 and the groove diameter of the groove 11 of the shaft 10 is D1 in this state, the outer diameter D2 of the shaft> the inner diameter d1 of the locking ring> the shaft 10 The concave portion 21a so as to have the groove diameter D1 of the groove 11,
The dimension of the convex portion 21b is set.

Next, the order of assembling the locking ring 20 will be described. Outer diameter of shaft D2 <annular (locking ring 2
Since the inner diameter d0 is 0), the locking ring 20 is inserted from the tip end direction of the shaft 10 to the groove 11 with the locking ring 20 open. Then, the locking ring 20 is tightened from the outer circumference to the inner circumference, and one convex portion 21b is connected to the other concave portion 21a.
And the other convex portion 21b is fitted into the one concave portion 21a. At this time, the inclined surfaces 21c serve as guides for each other and the locking ring 20 is deformed, and one convex portion 21b rides over the inclined surface 21c and fits into the other concave portion 21a, pushing the locking ring inward. , The concavities and convexities 21 on both ends are fitted together. Further, when one convex portion 21b goes over the inclined surface 21c, the total width W is set to be smaller than the width T of the groove 11 of the shaft, so that the locking ring 20 can be easily fitted in the groove 11 of the shaft 10. it can. Furthermore, after fitting, D2>d1> D1
Therefore, as long as the unevenness 21 is fitted, the locking ring 20 does not fall out from the groove 11 of the shaft 10.

By the above, the assembling is completed. Since it is configured as described above, when the locking ring 20 is assembled in the groove 11 of the shaft 10 and the shaft 10 rotates, the locking ring 20 does not expand due to centrifugal force, and the groove 11 of the shaft 10 does not expand. It is possible to prevent the locking ring 20 from falling off. Further, the locking ring 20 can be easily assembled without using a special jig.

In the above embodiment, the shaft groove 11 is used.
The width T of the shaft is larger than the total width W,
The width T of 1 is smaller than the total width W so that the protrusion 21 or the groove 1
The locking ring 20 may be assembled by forcibly deforming 1. In the above-described embodiment, the pinion gear 30 is used as the locking ring 20, but it is needless to say that it can be applied to other shaft axial locking structures.

Next, another embodiment will be described with reference to FIGS.
It will be explained in. In the above embodiment, the guide portion is formed by the inclined surface 21c.
However, as shown in FIG. 5, the concave portions 21a and the convex portions 21b of the concavo-convex portion 21 may have an arcuate shape and have smooth curved portions (second embodiment), and as shown in FIG. The concave portions 21a and the convex portions 21b of the unevenness 21 may have a keyhole shape and a shape corresponding to the keyhole shape, that is, the guide portions may be provided only on one side of both ends of the locking ring 21 (third embodiment).

FIG. 7 shows a fourth embodiment, and is a front view of the locking ring showing a state before assembling the locking ring of the fourth embodiment. FIG. 8 shows the fourth embodiment. FIG. 9 is a front view showing a state in which the locking ring of FIG.
FIG. 10 is a partially enlarged front view of the state where the locking ring of the fourth embodiment is assembled to the shaft. As shown in FIGS. 7 to 9, the unevenness 21 is unevenly projected toward the outer side or the inner side in the radial direction of the shaft 10. Then, assuming that the axial thickness of the locking ring 20 is t, if 2t> T is set, when the pinion gear 30 tilts and contacts the locking ring 20 due to backlash with the shaft 10 or the like, Bent 21 in the axial direction
Even if a force to displace the lock is applied, since 2t> T, the locking ring 20 is locked to the side wall 11a of the groove 11,
The unevenness 21 does not come off, and a reliable locking ring structure can be obtained.

[Brief description of drawings]

FIG. 1 is a side sectional view of a starter using a locking ring structure of the present invention.

FIG. 2 is a front view of a locking ring showing a state before assembly.

FIG. 3 is a partially enlarged front view of a locking ring showing a state before assembly.

FIG. 4 is a front view showing a state in which a locking ring is assembled to a shaft.

FIG. 5 is a side view showing a pinion locking ring according to a second embodiment of the present invention.

FIG. 6 is a side view showing a pinion locking ring according to a third embodiment of the present invention.

FIG. 7 is a front view of the locking ring showing a state before the locking ring of the fourth embodiment is assembled.

FIG. 8 is a front view showing a state where the locking ring of the fourth embodiment is assembled to the shaft.

FIG. 9 is a partially enlarged front view showing a state where the locking ring of the fourth embodiment is assembled to the shaft. (When the pinion tilts and contacts the locking ring)

[Explanation of symbols]

 10 shaft 11 groove 20 locking ring (ring member) 21 unevenness 21a concave 21b convex 21c inclined surface (guide) 30 pinion gear (moving member)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masami Niimi 1-1-1, Showa-cho, Kariya city, Aichi prefecture

Claims (5)

[Claims] 1. A locking ring structure comprising a shaft having a groove formed on an outer periphery thereof, the shaft supporting a moving member, and an annular ring member fitted into the groove. A locking ring structure having a fitting portion for fitting. 2. The locking ring structure according to claim 1, wherein the fitting portion is an uneven portion. 3. The concavo-convex portion is formed so as to face each other in the axial direction of the shaft, and the axial widths of the convex portions of the concavo-convex portion facing each other are W1, W.
2, the total width of W1 and W2 is W, the groove width of the shaft is T, and T> W is satisfied, and the inner diameter of the annular member before fitting the concave-convex portion is d0. The inner diameter after fitting the uneven portion is d1, the groove diameter of the shaft is D1, and the outer diameter of the shaft is D2. Before fitting the uneven portion, d0> D2
And after fitting the concave and convex portions, D1
The locking ring structure according to claim 2, wherein <d1 <D2. 4. The concavo-convex portions are formed so as to face each other in the radial direction of the shaft, the inner diameter before fitting of the concavo-convex portion of the ring member is d0, and the concavo-convex portion of the ring member is fitted. The rear inner diameter is d1, the groove diameter of the shaft is D1, the outer diameter of the shaft is D2, the axial thickness of the ring member is t, and the groove width of the shaft is T. ,
d0> D2, and after the fitting of the concavo-convex portion, D1 <d1 <D2, and 2t>
The locking ring structure according to claim 2, wherein the locking ring structure is T. 5. The locking ring structure according to claim 1, wherein a guide portion for fitting the fitting portion is provided on at least one of both open ends of the ring member.