JP5432844B2 - Ring member used for continuously variable transmission belt - Google Patents

Description

  The present invention relates to a ring member used for a continuously variable transmission belt.

  A continuously variable transmission (hereinafter referred to as CVT) for a vehicle has a pair of pulleys and a continuously variable transmission belt (which is hung in a V-shaped groove formed on each of the pair of pulleys). CVT belt). When the driving force from the driving source (engine) is transmitted to one of the pair of pulleys (input side pulley), the input side pulley rotates with its shaft as a rotation axis. The rotation of the input side pulley is transmitted to the other pulley (output side pulley) via the CVT belt, and the output side pulley also rotates around the shaft. The width of the V-shaped groove (pulley diameter) of each of the input-side pulley and the output-side pulley is variable, and the CVT belt, the input-side pulley, and the output-side pulley are changed by changing the width of the V-shaped groove. The contact diameter changes. As a result, the gear ratio between the input pulley and the output pulley changes continuously.

  As a CVT belt, a metal belt including two annular metal rings having the same shape and a large number of metal pieces having the same shape is known (see Patent Document 1). Slots are formed laterally on each side of the metal frame, and a large number of metal rings are inserted into the slots of the metal frame by inserting two annular metal rings from the sides. The tops are arranged in a ring along the metal ring. A number of metal pieces come into contact with the V-shaped grooves of the input side pulley and the output side pulley, respectively.

  Maraging steel is adopted as a material for a metal ring into which a large number of metal pieces are inserted. A multi-layered ring-shaped thin plate (maraging steel strip) made of maraging steel (for example, nine) is used as a metal ring (see Patent Document 2).

  Maraging steel has a high tensile strength. However, on the other hand, maraging steel has a drawback that it is very expensive because it is made by adding rare metals.

  In addition, in a metal ring configured by laminating a large number of annular maraging steel strips, high accuracy is required for each dimension (plate thickness, etc.) of the maraging steel strip.

Japanese Examined Patent Publication No. 7-81610 JP 2001-316726 A

  An object of the present invention is to provide a ring member used for a CVT belt which has a tensile strength as high as that of a metal ring using a number of maraging steel strips and can be produced at low cost. To do.

  Another object of the present invention is to prevent deterioration of the ring member by suppressing fretting of metals in the ring member.

  The ring member used in the continuously variable transmission belt according to the present invention includes an annular steel wire layer formed by a steel wire wound while being annularly aligned a plurality of times, and the annular steel wire layer on the outer peripheral side and the inner side thereof. Two maraging steel strips sandwiched from the circumferential side are provided.

  A ring member used in a continuously variable transmission belt according to the present invention includes an annular steel wire layer (annular body) formed by steel wires wound in an annular manner while being aligned a plurality of times. The longitudinal direction of the steel wire in the annular steel wire layer is along the circumferential direction of the ring member. Since the steel wire has a relatively high tensile strength in the longitudinal direction, it can achieve a strength level comparable to that of a conventional metal ring formed by laminating a plurality of maraging steel strips. In addition, since steel wires are more widely used than maraging steels, it is possible to manufacture ring members used for continuously variable transmission belts at a relatively low cost.

  In one embodiment, a plurality of annular steel wire layers are laminated between the two maraging steel strips. Since the number of windings of the steel wire is increased, the strength of the ring member can be increased.

  Each of the plurality of annular steel wire layers may be constituted by one steel wire, or a plurality of annular steel wire layers may be constituted by one steel wire.

  Preferably, resin (generally rubber) is filled between the plurality of annular steel wire layers. Since the annular steel wire layers are not in direct contact with each other, fretting between the annular steel wire layers can be suppressed.

  A resin may be filled between the annular steel wire layer adjacent to the maraging steel strip and the maraging steel strip. Since the annular steel wire layer and the maraging steel strip are not in direct contact, fretting between the annular steel wire layer and the maraging steel strip is suppressed.

  Further, a resin may be filled between the steel wires in the annular steel wire layer. Direct contact between aligned and wound steel wires is also prevented.

  In one embodiment, the annular steel wire layer is formed of a resin-coated steel wire. Direct contact between the aligned and wound steel wires, between the annular steel wire layers, and between the annular steel wire layer and the maraging steel strip is prevented.

  The steel wire may be a round wire (circular cross-section), or a flat wire (a wire surrounded by two opposing flat surfaces and two opposing curved surfaces curved in an arc, The cross section may be a track shape).

It is a fragmentary perspective view of a CVT belt. It is a partially broken perspective view of a ring member. It is an expanded cross-sectional view of a ring member. It is a perspective view of a steel wire coated with resin. It is a perspective view which shows the arrangement | sequence state of the steel wire by which resin coating was carried out. It is a cross-sectional view which shows the ring member in a vulcanization molding process. It is a cross-sectional view of a ring member according to another embodiment. It is a cross-sectional view which shows a vulcanization molding process. It is a cross-sectional view of a ring member according to still another embodiment. It is a cross-sectional view of a ring member according to still another embodiment. It is a cross-sectional view of a ring member according to still another embodiment.

  FIG. 1 shows an embodiment of the present invention, and is a perspective view of a part of a CVT belt 1. FIG. 2 is a partially broken perspective view of the ring member 3 constituting the CVT belt 1.

  The CVT belt 1 is used by being hung on a V-shaped groove formed in each of a pair of input side pulleys and output side pulleys provided in a continuously variable transmission (CVT) for a vehicle. The driving force transmitted from the driving source (engine) to the side pulley is transmitted to the output side pulley. The CVT belt 1 includes a plurality of metal pieces 2 having the same shape and two ring members 3 having the same shape formed in an annular shape. The cross section of the annular ring member 3 is substantially rectangular, and the length of the long side corresponds to the width of the ring member 3 and the length of the short side corresponds to the thickness of the ring member 3. The metal piece 2 has a substantially trapezoidal shape when viewed from the front, and slots 2a and 2b are formed laterally on both left and right sides thereof. The heights of the slots 2a and 2b substantially coincide with the thickness of the ring member 3, and two annular ring members 3 are respectively inserted into the slots 2a and 2b from the side. A large number of metal pieces 2 sandwiched from two sides by two annular ring members 3 are arranged in an annular shape along the two ring members 3.

  The ring member 3 includes a steel wire 5, a resin (rubber) 6 surrounding the steel wire 5, and two thin maraging steel strips 4 constituting the outer surface 3a and the inner surface 3b of the ring member 3. ing.

  FIG. 3 is an enlarged cross-sectional view of the ring member 3.

  When the ring member 3 is viewed from the cross section, the ring members 3 are arranged in two upper and lower stages in the direction connecting the outer side surface 3a and the inner side surface 3b, and in each of them, nine in a row at substantially equal intervals in the horizontal direction (width direction of the ring member 3) A total of 18 steel wire 5 cross sections can be seen. The steel wire 5 has a track-shaped cross section surrounded by two flat surfaces 5a and 5b and two curved surfaces 5c and 5d that are curved in an arc toward the outside. The flat surfaces 5 a and 5 b are substantially parallel to the outer surface 3 a and the inner surface 3 b of the ring member 3.

  The whole of the steel wires 5 that appear side by side in the cross section will be referred to as annular steel wire layers 7 and 8 hereinafter. Two annular steel wire layers 7 and 8 are annularly formed along the circumferential direction of the ring member 3.

  The annular steel wire layers 7 and 8 are moved laterally (one direction along the width direction of the ring member 3) using the traverse of the steel wire 5 covered with resin (rubber) 6 using an extruder. It is formed in an annular shape by winding it 9 times in a circular manner on the bobbin or the like (in a close-packed state), and then winding it while aligning it 9 times in an annular manner while moving in the opposite direction. Thereafter, vulcanization molding described later was performed. FIG. 4 is an enlarged perspective view of the steel wire 5 covered with the resin (rubber) 6. FIG. 5 shows a part of a state in which the steel wire 5 covered with the resin 6 is circularly aligned and wound. As shown in FIG. 5, the steel wires 5 that appear to be separated in the cross section (FIG. 3) are constituted by a single continuous steel wire 5.

  As described above, the steel wire 5 constituting the ring member 3 is covered with the resin 6. For this reason, the resin 6 exists around the steel wire 5 in the cross section of the ring member 3. On the outer peripheral side of the annular steel wire layer 7 and the inner peripheral side of the annular steel wire layer 8, thin plate-like maraging steel strips 4 are respectively arranged. Each of the outer surfaces of the two maraging steel strips 4 becomes an outer surface 3a and an inner surface 3b of the ring member 3.

  FIG. 6 is a cross-sectional view showing the ring member during the vulcanization molding process.

  A flat steel wire 5 is prepared by coating a resin (rubber) 6 with an extruder around the flat steel wire 5 (FIG. 4). The steel wire 5 covered with the resin 6 is wound while being aligned in a plurality of times using a traverse as described above, and the annular steel wire layers 7 and 8 are arranged (FIG. 5). Thereafter, the annular steel wire layers 7 and 8 are placed in the annular molds 9A and 9B and vulcanized and molded in a high pressure environment. By vulcanization molding under a high pressure environment, the resin 6 covering the periphery of the steel wire 5 penetrates into the gap between the steel wires 5 and the gap between the steel wires 5 and the molds 9A and 9B. Preferably, an adhesive is applied to the surface of the steel wire 5 in advance. After the vulcanization molding, the steel wire 5 and the resin 6 are bonded and integrated. When the annular steel wire layers 7 and 8 in which the resin 6 is integrated are taken out from the molds 9A and 9B and the maraging steel strip 4 is fitted on the inner and outer peripheral sides thereof, the ring member 3 (FIG. 2) is completed. To do.

  The manufactured ring member 3 includes annular steel wire layers 7 and 8 in which steel wires 5 are arranged and aligned, and a resin 6 between adjacent steel wires 5 and between the steel wires 5 and the maraging steel strip 4. Is filled. For this reason, the steel wires 5 and the steel wires 5 and the maraging steel strip 4 are in direct contact with each other, and wear or damage (fretting) is suppressed.

  Since the steel wire 5 has a relatively high tensile strength in the longitudinal direction, and the steel wire 5 is flat, the filling rate of the steel wire 5 in the ring member 3 (the cross-sectional area of the cross section of the ring member 3). The ratio of the cross-sectional area of the steel wire 5 occupying is large. Therefore, the tensile strength of the ring member 3 including the annular steel wire layers 7 and 8 constituted by winding the steel wire 5 a plurality of times is high, and a plurality of (for example, nine) maraging steel strips 4 are laminated. Demonstrates high tensile strength almost the same as metal rings. In addition, since the steel wire 5 is a widely used member, the ring member 3 can be manufactured at a lower cost than a metal ring composed of a plurality of maraging steel strips. Furthermore, since the steel wire 5 is flat, the bending fatigue resistance of the pulley on which the CVT belt 1 is hung is good.

  In the above-described embodiment, the ring member 3 including the two annular steel wire layers 7 and 8 has been described. Of course, the annular steel wire layer may be further laminated in three layers (four layers, etc.). The number of annular steel wire layers is appropriately determined according to the size of the metal piece 2 used in the CVT belt 1, the size of the slots 2a and 2b, the diameter of the steel wire 5, and the like.

  Further, in the above-described embodiment, the example in which the two annular steel wire layers 7 and 8 are configured by using one steel wire 5 has been described. However, separate steel is provided in each of the annular steel wire layers 7 and 8. A wire 5 (that is, two steel wires 5) may be used.

  FIG. 7 shows a cross-sectional view of a ring member 3A according to another embodiment. 3 is different from the ring member 3 shown in FIG. 3 in that the curved surfaces 5c and 5d of the steel wire 5 are in contact with the curved surfaces 5d and 5c of the adjacent steel wire 5. FIG. 8 is a cross-sectional view showing the manufacturing process of the ring member 3A shown in FIG.

  For manufacturing the ring member 3A shown in FIG. 7, a steel wire 5 not covered with resin is used.

  Referring to FIG. 8, when manufacturing ring member 3 </ b> A using steel wire 5 not coated with resin, annular steel is obtained by winding flat steel wire 5 while moving it in the horizontal direction while aligning it 9 times. A wire layer 8 is formed. Thereafter, an annular resin plate (rubber plate) 6B is arranged on the outer peripheral surface side of the annular steel wire layer 8, and the annular steel wire layer 7 is formed by winding the steel wire 5 on the resin plate 6B while aligning it nine times. To do. Thereafter, the annular resin plates 6A and 6C are disposed on the outer peripheral side of the annular steel wire layer 7 and the inner peripheral side of the annular steel wire layer 8, respectively. The annular steel wire layers 7 and 8 and the resin plates 6A, 6B, and 6C are placed in the annular molds 9A and 9B, and vulcanized and molded in a high-pressure environment so that the steel wire 5 and the resin plates 6A, 6B, and 6C are integrated. Turn into. When the maraging steel strip 4 is fitted on the inner peripheral side and the outer peripheral side of the annular steel wire layers 7 and 8 integrated with the resin, the ring member 3A is completed (FIG. 7).

  In the ring member 3A, the curved surfaces 5c, 5d of the adjacent steel wires 5 are in contact with each other, but the curved surfaces 5c, 5d of the steel wires 5 are curved in an arc toward the outside, so the curved surfaces 5c, 5d are Touches linearly. Therefore, wear due to fretting hardly occurs.

  The resin 6 is interposed between the annular steel wire layers 7 and 8 and the maraging steel strip 4 and between the annular steel wire layer 7 and the annular steel wire layer 8, the ring member 3 described above (see FIG. 3). ).

  FIG. 9 is a cross-sectional view of a ring member 3B in still another embodiment. The ring member 3 </ b> A shown in FIG. 7 is different in that no resin exists between the annular steel wire layer 8 on the inner peripheral side and the maraging steel strip 4. The ring member 3B shown in FIG. 9 is manufactured using a steel wire 5 that is not resin-coated and two thin resin plates 6A and 6B (see FIG. 8).

  A CVT belt 1 (see FIG. 1) including a ring member is used while being hung on a pulley, and a large bend is applied to the pulley. The steel wire 5 located near the outer surface 3a of the ring member 3B, that is, the steel wire 5 constituting the annular steel wire layer 7 on the outer circumferential side is closer to the inner circumferential side annular steel wire located closer to the inner surface 3b. Large elongation occurs compared to the steel wire 5 constituting the layer 8. For this reason, a resin 6 is filled between the maraging steel strip 4 on the outer surface 3a side and the annular steel wire layer 7 in order to prevent fretting and the like.

  As described above, since the elongation of the steel wire 5 constituting the annular steel wire layer 8 located near the inner side surface 3b is small, the maraging steel strip 4 on the inner side surface 3b side and the annular steel wire layer 8 are interposed between them. The resin is not filled. By using as little resin as possible, when it is necessary to make the ring member 3B to a predetermined thickness, use a steel wire 5 having a larger diameter, or increase the number of annular steel wire layers. Can do. The strength efficiency per cross-sectional area of the ring member 3B can be increased.

  10 and 11 are cross-sectional views of ring members 3C and 3D according to still another embodiment. The ring members 3, 3A, 3B shown in FIGS. 3, 7, and 9 are different in that the steel wire 5A is a round wire and the cross-sectional shape is a circle. The ring member 3C shown in FIG. 10 and the ring member 3D shown in FIG.

  The annular steel wire layers 7A and 7B are formed by the round steel wire 5A. Since the steel wire 5A is a round wire, the adjacent steel wires 5A are in linear contact with each other, and the steel wire 5A and the maraging steel strip 4 are also in linear contact with each other. Therefore, deterioration due to fretting is unlikely to occur.

  When the resin 6 is used (FIG. 11), the annular steel wire layers 7A and 8A and the maraging steel strip 4 are bonded by the resin 6 (the annular steel wire layers 7A and 8A are connected to each other by the metal piece 2). Since the ring member 3D is fitted into the slots 2a and 2b (see FIG. 1), no particular bonding is required). When resin is not used (FIG. 10), the steel wires 5A and the annular steel wire layers 7A and 7B and the maraging steel strip 4 are fixed by welding or the like.

1 CVT belt 2 Metal frame 3, 3A, 3B, 3C, 3D Ring member 4 Maraging steel strip 5, 5A Steel wire 6 Resin (rubber)
7,7A, 8,8B annular steel wire layer

Claims (2)

A plurality of annular steel wire layers formed by steel wires wound while being aligned in a ring a plurality of times, and two maraging steel strips sandwiching the plurality of annular steel wire layers from the outer peripheral side and the inner peripheral side, respectively A ring member used for a continuously variable transmission belt ,
The steel wires constituting the plurality of annular steel wire layers have a track-like cross section surrounded by two opposing flat surfaces and two opposing outwardly curved curved surfaces 1 A plurality of annular steel wires, each of the annular steel wire layers being wound in such a manner that the curved surfaces of the steel wires are adjacent to each other in the width direction of the ring member. Resin is filled between the wire layers and between the maraging steel strip and the annular steel wire layer adjacent to the maraging steel strip,
Ring member. Resin is filled between the steel wires in the annular steel wire layer,
The ring member according to claim 1 .

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