JP4748116B2 - Snap ring - Google Patents

Description

  The present invention relates to a snap ring.

  In general, a vehicle has a transmission on the output side of the drive source in order to transmit a driving force from an internal combustion engine or an electric motor that is a drive source, that is, an output torque, to the road surface under an optimal condition according to the traveling state of the vehicle. Is provided. There are two types of transmissions: a continuously variable transmission that controls the gear ratio steplessly (continuously) and a stepped transmission that controls the gear ratio stepwise (discontinuously). Here, the continuously variable transmission includes a belt-type continuously variable transmission that transmits a driving force from the primary pulley to the secondary pulley via a belt wound around the primary pulley and the secondary pulley.

  The belt type continuously variable transmission is provided with restriction means for restricting movement of the restriction component member in the axial direction. For example, snap rings as shown in Patent Documents 1 to 4 are used as the regulating means. The snap ring is fitted in a ring groove formed on the inner peripheral surface of the fixed component member, for example, the protruding portion of the movable sheave, thereby restricting movement of the restriction component member, for example, the balance plate in the axial direction.

  The conventional snap ring is fitted into the ring groove by applying an external force to the snap ring so that both ends are brought close to each other, thereby elastically deforming the snap ring and making the outer diameter of the snap ring smaller than the inner diameter of the ring groove. Done. Therefore, in the conventional snap ring, a gap is formed between both ends in a state where no external force is applied. Thereby, the external diameter can be made small when the snap ring is elastically deformed by applying an external force so as to bring both end portions closer to each other. Here, since the conventional snap ring fitted in the ring groove is larger than the outer diameter at the time of fitting, a gap is formed between both ends in the ring groove. External force is applied to the snap ring from various directions during the driving of the belt type continuously variable transmission. Therefore, the snap ring is elastically deformed, the outer diameter is reduced, and there is a possibility that the snap ring is detached from the ring groove.

  Therefore, in the prior art, as shown in Patent Document 5, for example, a technique has been proposed in which a snap ring fitted in a ring groove is pressed in the groove bottom direction by a support member. The prior art shown in Patent Document 5 forms pressing means for pressing the snap ring on the support member, and when the snap ring is fitted into the ring groove, the pressing means presses the snap ring toward the groove bottom, It suppresses coming off from the ring groove. However, in the prior art shown in Patent Document 5, the pressing means must be formed on the support member, and the pressing means may not be formed on the support member depending on the location where the snap ring is applied. That is, in the prior art shown in Patent Document 5, the snap-off preventing function for preventing the snap ring from coming off from the ring groove is constituted by a member separate from the snap ring, and the snap ring alone can realize the come-off preventing function. It was not possible and there were problems such as low versatility.

JP 7-71430 A JP-A-7-12113 Japanese Patent Laid-Open No. 7-19610 Japanese Patent Laid-Open No. 9-229035 Japanese Patent Laid-Open No. 11-22712

  Therefore, the present invention has been made in view of the above, and an object of the present invention is to provide a snap ring that can be prevented from coming off from a ring groove that is fitted alone.

  In order to solve the above-described problems and achieve the object, in the present invention, a gap is formed between both ends in the state where no external force is applied, and a ring groove formed on the inner peripheral surface of the fixed component member. In the snap ring to be fitted, at both ends, when an external force for fitting the snap ring into the ring groove is applied, a thin portion facing each other is formed, and each thin portion projects toward the opposing thin portion. And the bending part which can be elastically deformed is formed, respectively.

  According to the present invention, when an external force for fitting the snap ring into the ring groove is applied to the snap ring, the snap ring is elastically deformed, and the thin portions at both ends face each other. At this time, the bent portion of the thin portion is elastically deformed by being in contact with the opposing thin portion. Therefore, when the thin portions are opposed to each other, it is possible to prevent the thickness of the overlapping thin portions from becoming larger than the thickness of the snap ring. Thereby, the snap ring can be fitted into the ring groove by applying an external force to be fitted into the ring groove.

  Moreover, since the snap ring fitted in the ring groove is larger than the outer diameter when fitted, a gap is formed between both ends in the ring groove. That is, the thin part of the snap ring in the ring groove is in a state of facing each other through the gap. At this time, the bent portion recovers elastically and protrudes toward the opposing thin portion. Therefore, when an external force is applied to the snap ring in the ring groove, the outer diameter is reduced, and when the thin portions contact each other, the bent portion of one thin portion comes into contact with the end surface of the other thin portion; Become. As a result, the snap ring is restricted from elastically deforming in a direction in which the outer diameter of the snap ring decreases, so that the bent portion comes into contact with the end face of the thin wall portion, so that the snap ring can be detached from the fitted ring groove by itself. Can be suppressed.

  In the snap ring, each bent portion is preferably formed at one end on the radially outer side and the other end on the radially inner end of both ends in the radial direction of each thin portion. .

  The snap ring is preferably a restricting means for restricting movement in the axial direction of a restricting constituent member constituting the belt type continuously variable transmission.

  The snap ring concerning this invention has the effect that it can suppress that it remove | deviates from the ring groove fitted by itself.

  Hereinafter, the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited by the following embodiment. In addition, constituent elements in the following embodiments include those that can be easily assumed by those skilled in the art or that are substantially the same. Here, the snap ring according to the following embodiment is used as a regulating means in the belt-type continuously variable transmission, and is axially directed to a balance plate or the like that is a regulating component constituting the belt-type continuously variable transmission. The movement to is restricted.

[Embodiment]
FIG. 1 is a diagram illustrating a configuration example of a snap ring according to an embodiment. FIG. 2 is a perspective view of one end of the snap ring. FIG. 3 is a perspective view of the other end of the snap ring. FIG. 4 is an explanatory diagram of fitting the snap ring into the ring groove. FIG. 5 is an operation explanatory diagram when the snap ring is fitted. FIG. 6 is a view showing a snap ring fitted in the ring groove. FIG. 7 is a cross-sectional view taken along the line AA of FIG. FIG. 8 is a BB arrow view of FIG.

  The snap ring 1 according to the embodiment is made of an elastically deformable material. Further, the snap ring 1 is fitted into a fixed component constituting a belt type continuously variable transmission (not shown), for example, a ring groove 100b formed on the inner peripheral surface 100a of the movable sheave 100 shown in FIG. The snap ring 1 is a restricting member that restricts movement in the axial direction of a restricting constituent member constituting the belt-type continuously variable transmission, for example, the balance plate 200. The snap ring 1 is formed in a C shape, and both end portions 2 and 3 are formed in the circumferential direction. Here, the snap ring 1 is such that a gap S is formed between both end portions 2 and 3 in the state where no external force is applied to the snap ring 1.

  As shown in FIGS. 1 to 3, thin portions 21 and 31 are formed at both ends 2 and 3 of the snap ring 1. In the embodiment, the thin portion 21 of one end portion 2 of the both end portions 2 and 3 is formed on one side (the lower side in the drawing in FIG. 2) in the thickness direction. Moreover, the thin part 31 of the other edge part 3 among the both ends 2 and 3 is formed in the other side (FIG. 3 upper side of a paper surface) among thickness directions. That is, the thin portions 21 and 31 are formed to face each other when an external force in the direction of filling the gap S in the snap ring 1, that is, an external force for fitting the snap ring 1 into the ring groove 100b is applied. The thickness D1 of the thin portion 21 and the thickness D2 of the thin portion 31 are, for example, such that the combined thickness of the thin portions 21, 31 when the thin portions 21, 31 overlap each other is equal to or less than the thickness D of the snap ring 1. It is set to be.

  Here, the thin portions 21 and 31 are formed with bent portions 22 and 32, respectively. The bending portion 22 of the thin-walled portion 21 is directed toward the thin-walled portion 31 facing when the thin-walled portion 21 is applied with an external force for fitting the snap ring 1 into the ring groove 100b, that is, on the other side in the thickness direction (in FIG. , Projecting to the upper side of the paper). Moreover, the bending part 22 is formed in the edge part 21a of the radial direction outer side among the both ends in the radial direction of the thin part 21. As shown in FIG. In the embodiment, the bent portion 32 of the thin-walled portion 31 is directed toward the thin-walled portion 21 facing when the thin-walled portion 31 is applied with an external force that fits the snap ring 1 into the ring groove 100b, that is, one of the thickness directions. It protrudes to the side (lower side in FIG. 3). Moreover, the bending part 32 is formed in the edge part 31a inside radial direction among the both ends in the radial direction of the thin part 31 in embodiment. That is, each bending part 22 and 32 protrudes toward the thin part 21 and 31 which opposes, and is formed in the thin part 21 and 31. FIG. As described above, each of the bent portions 22 and 32 is easily formed because the snap ring 1 is formed of an elastically deformable material and the thin-walled portions 21 and 31 are thinner than other snap ring 1 portions. Elastic deformation is possible. Further, the protruding amount of the opposing thin portions 21, 31 of the bent portions 22, 32 is such that the gap S disappears due to the elastic deformation of the snap ring 1 and the two thin portions 21, 3 face each other. This is the amount by which the bent portions 22 and 32 of the portions 21 and 31 can come into contact with the end surfaces 31 b and 21 b of the other thin portions 31 and 21.

  Next, an operation when the snap ring 1 according to the embodiment is fitted in the ring groove 100b formed on the inner peripheral surface 100a of the movable sheave 100 will be described. First, the snap ring 1 is elastically deformed. Here, the snap ring 1 has an outer diameter L2 smaller than an inner diameter L3 of the ring groove 100b into which the snap ring 1 is fitted, as shown in FIG. 4, from a radius L1 (see FIG. 1) in a state where no external force is applied. It is elastically deformed until As a result, the gap S formed between the two end portions 2 and 3 in a state where no external force is applied is eliminated, and the thin portions 21 and 31 of the two end portions 2 and 3 face each other.

  At this time, as shown in FIG. 5, the thin portion 21 and the thin portion 31 move in the fitting direction, that is, in a direction approaching each other. Here, since the bending parts 22 and 32 of each thin part 21 and 31 are elastically deformable, they can deform | transform. The deformation direction of the bending portions 22 and 32 is a direction away from the thin portions 21 and 31 because the thin portions 21 and 31 are pushed by the opposing thin portions 21 and 31 by moving in the fitting direction. That is, the bending portion 22 is deformed to one side (the lower side in the drawing in FIG. 5) in the direction away from the thin portion 31, that is, the thickness direction. The bending portion 32 is deformed in the direction away from the thin-walled portion 21, that is, the other side (upper side in FIG. 5) in the thickness direction. Therefore, the bending portions 22 and 32 have a small protrusion amount with respect to the thin portions 21 and 31 when the thin portions 21 and 31 face each other. Thereby, the thin parts 21 and 31 oppose each other, and the bent parts 22 and 32 are elastically deformed to be flat. Here, since the combined thickness of the thin portions 21 and 31 when the thin portions 21 and 31 overlap each other is equal to or less than the thickness D of the snap ring 1, they overlap when the thin portions 21 and 31 face each other. It can suppress that the thickness of the thin parts 21 and 31 becomes thicker than the thickness D of the snap ring 1. FIG.

  Next, the snap ring 1 in a state of being elastically deformed to an outer diameter L2 smaller than the inner diameter L3 of the ring groove 100b into which the snap ring 1 is fitted is inserted into the ring groove 100b. Then, after the snap ring 1 is inserted into the ring groove 100b, the application of external force is terminated. As shown in FIG. 6, the snap ring 1 that has been elastically deformed and released from the external force is elastically recovered in the ring groove 100b to become an outer diameter L4 larger than the inner diameter L3 of the ring groove 100b. That is, the snap ring 1 fitted in the ring groove 100b becomes larger than the outer diameter L3 when fitted, and elastically recovers until a gap S ′ is formed between both end portions 2 and 3 in the ring groove 100b. . Accordingly, the thin portions 21 and 31 of the snap ring 1 in the ring groove 100b face each other through the gap S ′. At this time, the bent portions 22 and 32 of the thin-walled portions 21 and 31 that have been elastically deformed are elastically recovered and project toward the opposed thin-walled portions 31 and 21.

  As described above, as shown in FIG. 7, the snap ring 1 can be fitted into the ring groove 100 b formed on the inner peripheral surface 100 a of the movable sheave 100 by applying an external force fitted into the ring groove 100 b to the snap ring 1. . Here, the balance plate 200 is inserted into the movable sheave 100 before the snap ring 1 is fitted into the ring groove 100b. Thereby, the balance plate 200 is restricted from moving in the axial direction by the snap ring 1 fitted in the ring groove 100b, in this case, to the snap ring 1 side.

  Here, various external forces may be applied to the snap ring 1 fitted in the ring groove 100b when the belt type continuously variable transmission is driven. For example, there is a possibility that an external force for elastic deformation is applied to the snap ring 1 until the outer diameter L4 becomes smaller than the inner diameter L3 of the ring groove 100b. That is, the snap ring 1 fitted in the ring groove 100b may be elastically deformed and an external force may be applied to disengage from the ring groove 100b. In this case, since the bent portions 22 and 32 are elastically restored in the ring groove 100b and protrude toward the opposing thin portions 31 and 21, an external force is applied to the snap ring 1 in the ring groove 100b. When the outer diameter is reduced and the thin portions 2 and 3 are in contact with each other, the bent portion 22 of the thin portion 21 comes into contact with the end surface 31b of the thin portion 31 as shown in FIG. Further, as shown in D of FIG. 8, the bent portion 32 of the thin portion 31 comes into contact with the end surface 21 b of the thin portion 21. Therefore, the snap ring 1 is restricted from being elastically deformed in a direction in which the outer diameter of the snap ring 1 is reduced by the bent portions 22 and 32 coming into contact with the end surfaces 31 b and 21 b of the thin portions 31 and 21. As a result, the snap ring 1 can be prevented from being detached from the fitted ring groove 100b by itself.

It is a figure which shows the structural example of the snap ring concerning embodiment. It is a perspective view of one edge part of a snap ring. It is a perspective view of the other edge part of a snap ring. It is fitting explanatory drawing to the ring groove of a snap ring. It is operation | movement explanatory drawing at the time of fitting of a snap ring. It is a figure which shows the snap ring inserted by the ring groove. It is AA sectional drawing of FIG. It is a BB arrow line view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Snap ring 2 End part 21 Thin part 21a End part 21b End surface 22 Bending part 3 End part 31 Thin part 31a End part 31b End surface 32 Bending part 100 Movable sheave (fixed component member)
100a Inner peripheral surface 100b Ring groove 200 Balance plate (regulatory component)
S, S 'gap

Claims (3)

In a snap ring in which a gap is formed between both ends in a state where no external force is applied, and which is fitted into a ring groove formed on the inner peripheral surface of the fixed component member,
When the external force for fitting the snap ring into the ring groove is applied to the both end portions, thin portions facing each other are formed, respectively.
Each of the thin portions is formed with a bent portion that protrudes toward the opposing thin portion and is elastically deformable.   2. The bent portions according to claim 1, wherein one of the ends in the radial direction of each thin portion is formed at a radially outer end, and the other is formed at a radially inner end. Snap ring as described.   3. The snap ring according to claim 1, wherein the snap ring is a restricting means for restricting movement of the restricting constituent member constituting the belt type continuously variable transmission in the axial direction. 4.

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