JP4670193B2 - One-way clutch - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
This invention is a one-way clutch, and in particular, the tongue piece of the spring arranged on the inner diameter side of the cage does not interfere with a part of the sprag or the cage, and the strength of the tongue piece is increased so that the meshing performance is achieved. The present invention relates to a one-way clutch with improved performance.
[0002]
[Prior art]
A one-way clutch used in an automatic transmission of an automobile is disposed between an inner ring and an outer ring, and repeatedly performs transmission and interruption of power. As shown in FIG. 4, such a one-way clutch is usually composed of a sprag 15, a cage 13, and a spring 14, and is arranged in an annular space 20 between the outer ring 11 and the inner ring 12. When the outer ring 11 and the inner ring 12 rotate in one direction due to the relative rotation of the outer ring 11 and the inner ring 12, the sprag 15 acts as a wedge and the outer ring 11 and the inner ring 12 rotate integrally (lock), and when rotated in the other direction, the wedge action. Is released, idles and power transmission is cut off (unlocked).
[0003]
In the sprag type one-way clutch as described above, the spring 14 is guided on the inner diameter side of the retainer 13 to accurately position the sprag 15 held by the spring 14 in the radial direction. Further, the tongue piece portion 14t of the spring 14 usually applies a prestress (biasing force) to the side where the sprag 15 is locked, thereby contributing to the meshing property. In this way, the tongue piece 14t is displaced each time the sprag 15 is repeatedly idled and meshed. Therefore, the tongue piece portion that pre-stresses the sprag 15 is subjected to repeated stress, so that the rigidity is increased. For this reason, there are many examples in which the R processed portion is provided.
[0004]
[Problems to be solved by the invention]
As shown by the two-dot chain line in FIG. 4, when the R processed portion 14a portion of the tongue portion 14t of the spring is directed outward, the spring is normally guided to the inner diameter side of the cage 13, so this R processing is performed. There is a problem that the portion 14 a may interfere with the inner diameter side of the cage 13. Furthermore, when the spring tongue piece 14t is an outward R processed portion 14a, when the outer ring and the inner ring are excessively decentered, the tip of the tongue piece 14t is the only sprag at the maximum inclination of the sprag posture. Instead of acting, the R-processed portion 14a interferes with the sprags 15 and cannot exert an appropriate spring force, resulting in poor meshing properties.
FIG. 5 shows another conventional one-way clutch configuration. As shown in FIG. 5, the tongue 24t of the spring 24 disposed inside the cage 23 has a diameter in order to cope with repeated stress. An R processed portion 24a is formed on the inner diameter side in the direction to enhance the rigidity. In addition, when the R processing portion 24a facing the inner diameter is provided like the tongue portion 24t of the spring 24, there is a problem that large R processing cannot be performed because there is a concern about interference with the adjacent sprag 25 during idling.
[0005]
The present invention has been made to cope with the above-described problems, and the R processed portion provided in the tongue piece portion of the spring for applying a prestress (biasing force) to the sprag does not interfere with the cage or the sprag. Another object of the present invention is to provide a one-way clutch that has good meshability and is less likely to be deformed or broken.
[0006]
[Means for Solving the Problems]
That is, in order to solve the above-described problems, the present invention described in claim 1 includes a cage, a spring guided by the cage, a pocket of the cage, and a pocket of the spring. In a one-way clutch provided with a sprag that is movably arranged and is urged toward the lock side by a tongue piece formed on the spring,
Wherein the sprag (5), on the side in contact tongue section and (4t) of the spring (4), at the time of maximum slope, R processing portion formed on the tongue piece portion (4t) of the spring (4) (4c) It is formed with do not want to interfere with the first recess (5c).
[0007]
In addition, in the invention described in claim 1, the sprag (5) forms a second recess (5d) in contact with the tongue piece (4t) closer to the inner diameter, and the inclination direction when inclined is the R The processed portion (4c) is in a direction approaching the second concave portion (5d),
The second recess (5d) is located closer to the inner diameter than the first recess (5c) .
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.
FIG. 1A is a diagram showing a configuration of a one-way clutch of the present invention, which is a partial cross-sectional view perpendicular to the axial direction, and FIG. 1B is a diagram of FIG. It is a P section enlarged view. FIG. 2A is a partial plan view of a cage and a spring constituting the one-way clutch, and FIG. 2B is a side sectional view. FIG. 3 is a perspective view of the spring. The one-way clutch includes a cage 3, a spring 4 disposed on the inner diameter side of the cage 3, and a sprag 5 disposed in the pocket of the cage 3 and the spring 4. Arranged in an annular space 10 between the inner ring 2 and the outer ring 1 and the inner ring 2 are locked or released. In FIG. 2B, the solid line of the spring 4 indicates that the sprag 5 is not held, and the two-dot chain line indicates that the sprag 5 is held.
[0009]
The retainer 3 is formed with annular portions 3a, 3a on both sides, and connecting portions (column portions) 3b, 3b,... Are formed between the annular portions 3a, 3a at equal intervals in the circumferential direction. .. Pockets 3p, 3p,... Are formed between the annular portions 3a, 3a and the column portions 3b, 3b,. The retainer 3 is arranged on the inner diameter side so as to guide the spring 4.
[0010]
The cage 3 is formed so that the shape of the hole of the pocket 3p is a convex shape (meaning that the upper center is recessed upward and there are stepped portions on both sides). Further, one corner in the circumferential direction of the pocket 3p of the retainer 3, that is, the convex stepped portions (3c, 3c), the tongue piece portion 4t of the spring 4 is positioned therebetween as described later. By this, it becomes a guide part (henceforth the guide part 3c) which guides the spring 4. FIG.
[0011]
The spring 4 is formed with annular portions 4a, 4a on both sides, and connecting portions 4b, 4b,... Are formed at equal intervals in the circumferential direction between the annular portions 4a, 4a. .. Pockets 4p, 4p,... Are formed between 4a and pillars 4b, 4b,... And sprags 5 are also arranged in these pockets 4p, 4p,. That is, the cage 3 and the spring 4 are formed such that the annular portion 3a and the annular portion 4a, the column portion 3b and the column portion 4b, and the pocket portion 3p and the pocket portion 4p substantially overlap. As described above, the shape of the holes of the pockets 3p, 3p,... Of the cage 3 is formed in a convex shape, but the shape of the holes of the pockets 4p, 4p,. (In the meaning that the upper center is a hole shape protruding downward), in these pockets 3p, 4p, the downward protruding portion of the hole of the spring 4 is the tongue piece 4t, The tongue piece portion 4t biases the sprags 5 arranged in these pockets (3p, 4p).
[0012]
2A and 2B, between the guide portion 3c and the guide portion 3c of the hole of the pocket 3p of the cage 3 (that is, in the center in the width direction of the pocket 3p), The tongue piece 4t of the spring 4 is positioned. In this case, the width D of the guide portion 3c and the guide portion 3c of the pocket 3p of the cage 3 is larger than the width T of the tongue piece portion 4t of the spring 4. In other words, the cage 3 guides the spring 4 in close contact with the inner diameter side. In this case, the tongue piece 4t of the spring 4 is positioned in the space between the guide portions 3c, 3c of the pocket 3p. Thus, the spring 4 is guided. And the R process part 4c is given to the outer-diameter outer side direction of the tongue piece part 4t of this spring 4. FIG. As a result, the tongue piece 4t has a high bending rigidity and an increased strength against sagging and breakage.
[0013]
Next, the tongue piece 4t of the spring 4 has a slightly rounded tip 4e. When the sprag 5 is disposed in the pocket 4p of the spring 4, the tip 4e of the tongue piece 4t is brought into contact with a smooth second recess 5d formed near the inner diameter of the sprag 5 described later. Thus, the sprag 5 is biased to the locking side (see FIG. 1).
[0014]
Next, the sprag 5 forms a smooth cam surface 5a on the outer peripheral surface so as to be in contact with the inner peripheral surface 1a of the outer ring 1, and has a smooth cam surface 5b on the inner peripheral surface so as to be in contact with the outer peripheral surface 2a of the inner ring 2. Form. When the sprag 5 is fitted in the pocket 4p of the spring 4, the sprag 5 is in the maximum inclined state on the side of the surface of the sprag 5 in the swinging direction in contact with the tongue 4t of the spring 4. Then, a first recess 5c is provided so as not to interfere with the R processed portion 4c of the tongue 4t of the spring 4. Further, the inner diameter side of the first concave portion 5c of the sprag 5, R and earthenware pots by contact with the smooth second recess 5d of the end portion 4e of the tongue portion 4t of the spring 4 is formed. The side surface 5e of the sprag 5 opposite to the tongue 4t of the spring 4 is processed into a concave shape so that the sprag 5 has a rotation center at an appropriate position when the sprag 5 swings. ing.
[0015]
【The invention's effect】
As described above in detail, according to the one-way clutch of the present invention, the tongue portion of the spring that applies prestress (biasing force) to the sprag is provided with an R-processed portion for relieving stress, This R-processed portion can be prevented from interfering with other members such as sprags and cages. Therefore, it is possible to ensure sprag synchronization and improve the meshing of the one-way clutch. Further, the R processed portion of the tongue piece portion of the spring does not interfere with other members, so that deformation or breakage can be prevented.
[Brief description of the drawings]
1A is a diagram showing a configuration of a one-way clutch of the present invention, and is a partial cross-sectional view in a direction perpendicular to an axial direction. FIG. It is the P section enlarged view of (A).
FIG. 2 (A) is a partial plan view of a cage constituting the one-way clutch and a spring guided by the cage, and FIG. 2 (B) is a side sectional view.
FIG. 3 is a partial perspective view of a spring constituting the one-way clutch of the present invention.
FIG. 4 is a diagram showing a configuration of a conventional one-way clutch.
FIG. 5 is a diagram showing another configuration of a conventional one-way clutch.
[Explanation of symbols]
3 Cage 3c Guide part 3p Pocket 4 Spring 4p Spring pocket 4t Tongue piece part 4c R processing part 5 Sprag 5c 1st recessed part
5d second recess

Claims (1)

A retainer, a spring guided by the retainer, and a sprag that is swingably disposed in a pocket of the retainer and a pocket of the spring and is biased toward the lock side by a tongue piece formed on the spring. In the provided one-way clutch,
Wherein the sprag (5), on the side in contact tongue section and (4t) of the spring (4), at the time of maximum slope, R processing portion formed on the tongue piece portion (4t) of the spring (4) (4c) forming a do not want to interfere with the first recess (5c),
In addition, the sprag (5) forms a second recess (5d) in contact with the tongue piece (4t) closer to the inner diameter, and the R-machined portion (4c) is arranged in the second direction in the inclination direction when inclined. In the direction approaching the recess (5d) of
The one-way clutch, wherein the second recess (5d) is located on an inner diameter side of the first recess (5c) .

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