JP2018204684A - Manufacturing method of endless ring, and endless ring - Google Patents

Abstract

To enable a high-quality endless ring with an opening to be manufactured.SOLUTION: An endless ring manufacturing method for manufacturing an endless ring used in a transmission belt of a belt-type continuously variable transmission, comprises: a welding step of welding end parts of a band-like metal plate so as to abut to each other, to form an endless cylindrical body; a cutting step of cutting the cylindrical body to form a ring body with a predetermined width; a rolling step of rolling the ring body; a peripheral length adjustment step of adjusting a peripheral length of the rolled ring body; and an opening formation step of forming an opening at the ring body whose peripheral length has been adjusted.SELECTED DRAWING: Figure 5

Description

  The invention of the present disclosure disclosed herein relates to a method for manufacturing an endless ring and an endless ring.

  Conventionally, as a transmission belt used in a belt-type continuously variable transmission, a metal endless belt-like band (binding ring) and a number of metal push sesame (elements) stacked along the length of the band ) Have been proposed (see, for example, Patent Document 1). Each push sesame includes a body part, a pair of pillar parts, and a pair of bowl-shaped parts. The body portion has two side contact surfaces that are inclined so as to be in frictional contact with both inner side surfaces of the annular V groove of the pulley on both outer side surfaces, and a band mounting surface for mounting the band. At the top. The pair of pillar portions are erected from the body portion along an extension line of the side contact surface of the body portion. A pair of hook-shaped parts are extended inward from the front-end | tip part of each pillar part, and are arrange | positioned facing each other. An opening for inserting a plurality of hands arranged in layers is formed between the pair of hook-shaped portions. The band inserted from the opening of the push sesame is placed on the band placement surface at the upper end of the body part. The width of the opening is slightly narrower than the width of the band, and a single retainer (retainer ring) wider than the opening is used as the outermost layer of the band in order to securely hold the push sesame and the band. It is arranged on the outer periphery. The retainer is assembled by bending it into an inverted U-shaped cross section and pushing the retainer in a state where the width of the retainer is made smaller than the width of the opening of the sesame, and is inserted into the opening. The retainer is formed with a long hole in order to facilitate bending and improve the assembly workability.

Republished patent WO2005 / 019684A1

  By the way, the manufacture of an endless ring such as a band (binding ring) or a retainer (retainer ring) includes a welding process in which end portions of a band-shaped metal plate are butted and welded to form an endless cylindrical body, and a cylindrical body. It can be performed by sequentially executing a cutting step for cutting into a ring body having a predetermined width, a rolling step for rolling the ring body, and a circumferential length adjusting step for adjusting the circumferential length of the rolled ring body. For example, in the case of manufacturing an endless ring having an opening in order to provide flexibility or weight reduction in the width direction of the ring as described above, an opening forming step is further added. At this time, in what order and how the opening forming steps are executed can be recognized as an important issue in securing high quality.

  The manufacturing method of an endless ring according to the present disclosure is mainly intended to enable an endless ring having an opening to be manufactured with high quality. Moreover, the endless ring of this indication aims at suppressing that an excessive stress acts locally when tension | tensile_strength is applied.

  The endless ring manufacturing method and the endless ring of the present disclosure have taken the following measures in order to achieve the main object described above.

  An endless ring manufacturing method according to the present disclosure is an endless ring manufacturing method for manufacturing an endless ring used for a transmission belt of a belt-type continuously variable transmission, in which end portions of a belt-shaped metal plate are butted and welded endlessly. Welding step for forming the cylindrical body, a cutting step for cutting the cylindrical body into a ring body having a predetermined width, a rolling step for rolling the ring body, and a circumferential length for adjusting the circumferential length of the rolled ring body The gist is to include an adjustment step and an opening forming step of forming an opening in the ring body having an adjusted circumference.

  In the manufacturing method of the endless ring according to the present disclosure, a welding process, a cutting process, a rolling process, and a circumferential length adjusting process are sequentially performed. And the opening formation process which forms the opening of a ring body is performed after a circumference adjustment process. Thereby, since there is no process accompanied by plastic deformation of the ring body (opening) such as a rolling process and a circumferential length adjusting process after the opening forming process, it is possible to easily ensure the dimensional accuracy of the opening. As a result, an endless ring having an opening can be manufactured with high quality.

  An endless ring of the present disclosure is an endless ring that is used for a transmission belt of a belt-type continuously variable transmission and is formed by abutting and welding end portions of a band-shaped metal plate, and the width direction of the endless ring The gist of the present invention is that an opening is formed at a position that does not reach the welded portion of the endless ring.

  In the endless ring of the present disclosure, since the opening is formed at a position that does not reach the welded portion of the endless ring in the width direction of the endless ring, excessive stress is applied to the welded portion or the opening when tension is applied. It can suppress acting.

1 is a configuration diagram of a continuously variable transmission 1 having a transmission belt 10. FIG. 2 is a partial cross-sectional view of a transmission belt 10. FIG. 1 is an external view of a retainer ring 30. FIG. It is explanatory drawing which shows the long hole 30o and the welding part 30w of the retainer ring 30 of this embodiment, and the long hole 130o and the welding part 130w of the retainer ring 130 of a comparative example. FIG. 5 is a process diagram showing a manufacturing process of the retainer ring 30. FIG. 3 is a configuration diagram of a punching device 40. It is explanatory drawing which shows the mode of a R attaching process.

  Next, embodiments for carrying out the invention of the present disclosure will be described with reference to the drawings.

  FIG. 1 is a configuration diagram of a continuously variable transmission 1 having a transmission belt 10. As shown in the figure, the continuously variable transmission 1 includes a primary shaft 2 as a drive side rotation shaft, a primary pulley 3 that rotates integrally with the primary shaft 2, and a driven side rotation shaft that is arranged in parallel with the primary shaft 2. Secondary shaft 4, a secondary pulley 5 that rotates integrally with the secondary shaft 4, a transmission belt wound around a pulley groove (V-shaped groove) of the primary pulley 3 and a pulley groove (V-shaped groove) of the secondary pulley 5. 10 and. The primary shaft 2 is connected to an input shaft connected to a power source such as an engine via a forward / reverse switching mechanism. The secondary shaft 4 is connected to the drive shaft via a gear mechanism or a differential gear. The continuously variable transmission 1 can change the torque transmitted to the primary shaft 2 steplessly and output it to the secondary shaft 4 by changing the groove width of the primary pulley 3 and the groove width of the secondary pulley 5. .

  FIG. 2 is a partial cross-sectional view showing the transmission belt 10. As shown in the figure, the transmission belt 10 includes a single laminated ring 12 formed by laminating a plurality of (in this embodiment, nine) ring members 11 in the ring radial direction (thickness direction), and a laminated ring 12. A plurality of (for example, several hundred) elements 20 and one retainer ring 30 arranged in a ring shape (bundled) along the inner circumferential surface of the first ring 20.

  The plurality of ring members 11 constituting the laminated ring 12 are obtained by welding strips cut out from steel plate drums in a ring shape, and having substantially the same thickness and different perimeters predetermined for each. It is processed to have.

  Each element 20 is punched from a steel plate by, for example, press working, and as shown in FIG. 2, a main body portion 21 that extends horizontally in the drawing, and extends in the same direction from both end portions of the main body portion 21. It has a pair of pillar part 22 and the recessed part 23 as a ring accommodating part defined between a pair of pillar part 22 so that it might open to the extension side of each pillar part 22. As shown in FIG. The pair of pillar portions 22 are arranged in the radial direction of the laminated ring 12 from both sides in the width direction of the saddle surface 23 s which is the bottom surface of the recessed portion 23 (in the direction from the inner circumferential side to the outer circumferential side of the laminated ring 12, that is, upper in FIG. 2). A pair of hook portions 22f projecting in the width direction of the saddle surface 23s is formed at the extending end portion of each pillar portion 22. The pair of hook portions 22f protrude so as to be opposed to each other with an interval slightly longer than the width of the laminated ring 12 (ring material 11). As shown in FIG. 2, the laminated ring 12 is disposed in the concave portion 23, and the saddle surface 23 s of the concave portion 23 is in contact with the inner peripheral surface of the laminated ring 12, that is, the inner peripheral surface of the innermost ring material 11. ing.

  The retainer ring 30 is formed by welding a strip cut out from a steel plate drum into a ring shape, and has a thickness substantially the same as or thinner than the ring material 11 and a longer circumference than the outermost ring material 11. It is formed by a length and a width longer than the interval between the pair of hook portions 22f. The retainer ring 30 is elastically deformed in the width direction in a state in which the laminated ring 12 is accommodated in the recesses 23 of all the elements 20, and is fitted into the recesses 23 between the pair of hook portions 22f of each element 20. It is. Thereby, the retainer ring 30 is disposed between the outer peripheral surface of the ring material 11 of the outermost layer of the multilayer ring 12 and the inner peripheral surface of the hook portion 22f of each element 20, and surrounds the multilayer ring 12, and each element 20 Is prevented from falling off the laminated ring 12. In the present embodiment, the retainer ring 30 is formed with an opening (long hole) 30o as shown in FIG. 3, which makes it easy to elastically deform the retainer ring 30 in the width direction. Adequacy can be secured.

  FIG. 4 shows the long hole 30o and the welded portion 30w of the retainer ring 30 of the present embodiment, and the long hole 130o and the welded portion 130w of the retainer ring 130 of the comparative example. The retainer rings 30 and 130 are formed by welding strips in a ring shape and extending them to a desired peripheral length. For this reason, if the retainer rings 30 and 130 are extended while being affected by welding, the retainer rings 30 and 130 are formed in the welded portions 30w and 130w as exaggeratedly shown in FIGS. 4 (a) and 4 (b). Constriction occurs. Here, as shown in FIG. 4B, the opening 130o of the retainer ring 130 of the comparative example is formed so that a part thereof covers the welded portion 130w in the width direction. Now, in the width direction of the retainer ring 130, the width of the opening 130o is a, the width from the width direction end of the non-welded part to the edge of the opening 130o is X, and the width of the opening 130o from the width direction end of the welded part 130w. When the width to the edge is X ′, the constriction depth of the welded portion 130w is t, and the width of the non-welded portion is L, the cross-sectional area reduction rate at the welded portion 130w can be expressed by X ′ / X. . Here, L is 20.50 mm, a is 4.6 mm, and t is 0.08 mm. Since X ′ is (L−a−2 · t) / 2 and X is (L−a) / 2, the cross-sectional area reduction rate (X ′ / X) is 0.9899. On the other hand, the opening 30o of the retainer ring 30 of this embodiment is formed so as not to reach the welded portion 30w in the width direction, as shown in FIG. Now, in the width direction of the retainer ring 30, the width of the opening 30 o is a, the constriction depth of the welded portion 30 w is t, the width of the welded portion 30 w (distance between the constrictions) is Y ′, and the non-welded portion When the width is Y (= L), the cross-sectional area reduction rate in the welded portion 30w can be expressed by Y ′ / Y. Since Y ′ is Y−2 · t, the cross-sectional area reduction rate (Y ′ / Y) is 0.9922. Therefore, it can be seen that the retainer ring 30 of the present embodiment is less affected by the constriction of the welded portion when tension is applied than the retainer ring 130 of the comparative example.

  The retainer ring 30 is manufactured by the manufacturing process illustrated in FIG. As shown in the drawing, the manufacturing process of the retainer ring 30 includes (a) a strip cutting process, (b) a bending process, (c) a pre-welding cleaning process, (d) a welding process, and (e) a solution. Forming step (annealing step), (f) ring cutting step, (g) polishing step, (h) pre-rolling cleaning step, (i) rolling step, (j) post-rolling cleaning step, (k ) Second solution treatment step, (l) circumference adjustment step, (m) drilling step, (n) R attaching step, (o) cleaning / drying step, (p) aging / nitriding step Consists of.

  (A) The strip cutting step is a strip of a predetermined size by cutting a strip-shaped steel plate (maraging steel plate) having a predetermined thickness (for example, 0.4 to 0.5 mm) wound around a drum in the width direction. This is a step of cutting the plate 31. The strip cutting process can be performed using a cutter or a laser cutting machine having a cutting edge. (B) A bending process is a process which shape | molds the cylindrical body 32 by bending the edge part of the strip | belt board 31 so that it may mutually face | match. The bending step can be performed using a roll or a mold.

  (C) The pre-welding cleaning step is a step of degreasing and cleaning the cylindrical body 32 before welding the butted portion of the cylindrical body 32. The cleaning process before welding can be performed using, for example, shower cleaning or ultrasonic cleaning. (D) The welding process is a process of performing butt welding for welding the butt portion of the cylindrical body 32. The welding process can be performed using, for example, laser welding or plasma welding. (E) The first solution treatment step (annealing step) is a step for leveling the hardness distribution around the welded portion changed in the welding step and improving the spreadability.

  (F) The ring cutting step is a step of cutting the cylindrical body 32 into a plurality of ring bodies 33 having a predetermined width, and can be performed using a cutter cutting machine, a laser cutting machine, or the like. (G) The polishing step is a step of polishing the end portion (cut surface) in the width direction of the ring body 33 to process it into an R shape, and can be performed by barrel polishing or the like.

  (H) The pre-rolling cleaning step is a step of removing polishing debris attached to the ring body 33 in the polishing step (barrel polishing) before rolling the ring body 33. The cleaning process can be performed by, for example, shower cleaning or ultrasonic cleaning. (I) The rolling step is a step of rolling the ring body 33 to a necessary plate thickness using a rolling roller to form the ring body 34. (J) The post-rolling cleaning step is a step of removing rolling oil or the like attached to the ring body 34 by rolling. (K) The second solution forming step is a step of heating the rolled ring body 34 to recrystallize the metal structure deformed by rolling.

  (L) The circumferential length adjusting step is a step of adjusting the circumferential length of the rolled ring body 34 to obtain the ring body 35. In the circumference adjusting step, for example, the ring body 34 rolled over a pair of rolls is bridged, and the pair of rolls are separated from each other, thereby adjusting the circumference of the ring body 34.

  (M) The drilling step is a step of forming the opening 35o in the ring body 35 having an adjusted circumference, and can be performed using, for example, the drilling device 40 illustrated in FIG. As shown in the figure, the drilling device 40 is a laser processing machine that performs processing by laser, and a pair of tension rollers 41 and 42 that apply tension to the ring body 35 and a processing surface (hole drilling) of the ring body 35. Clamps 43 and 44 that fix both sides of the machining surface so that the surface is parallel to the horizontal plane (XY plane), a laser oscillator (not shown), and a laser from the laser oscillator is emitted toward the machining surface of the ring body 35. And a drive unit (not shown) that moves the head 45 in the X and Y directions, and a recovery unit 46 that is provided on the back side of the processing surface of the ring body 35 and recovers processing waste generated by laser processing. In this drilling device 40, the ring body 35 is stretched over a pair of tension rollers 41, 42, and the pair of tension rollers 41, 42 are separated from each other, thereby applying tension to the ring body 35. Both sides of the processed surface of the body 35 are fixed. At this time, the fixing position of the ring body 35 is adjusted by rotating the tension rollers 41 and 42 so that the processed surface of the ring body 35 does not reach the welded portion. Then, while driving the laser oscillator to emit laser from the head 45, the head 45 is moved in the XY direction by the driving device, thereby forming an elongated hole-shaped opening 35 o in the ring body 35. The drilling step is not limited to the one using the above-described drilling device 40 (laser processing machine), and an electric discharge machine that performs processing by arc discharge or a water cutter that performs processing by injecting pressurized water. Alternatively, a press machine for punching can be used.

  (N) The R attaching step is a step of chamfering the edge of the opening 35o of the ring body 35 to form an R shape as shown in FIG. In the present embodiment, the R attaching step is performed using barrel polishing. It is also possible to use a laser processing machine that emits a laser to the edge of the opening 35o of the ring body 35 and performs chamfering. (O) The cleaning / drying process is a process of removing the processing waste adhering to the ring body 35 by the drilling process or the R attaching process and drying the ring body 35. The cleaning process can be performed using, for example, shower cleaning or ultrasonic cleaning.

  (P) The aging / nitriding step is a step of strengthening the surface of the ring body 35 by nitriding the ring body 35 after aging treatment. Thereby, the retainer ring 30 in which the opening 30o is formed is formed.

  In the endless ring manufacturing method of the present embodiment described above, the drilling step (opening forming step) for forming the opening 35o (opening 30o) in the ring body 35 (retainer ring 30) is executed after the circumferential length adjusting step. . Since there is no process involving plastic deformation of the ring body such as a rolling process or a circumferential length adjusting process after the drilling process, the dimensional accuracy of the opening can be easily ensured. As a result, the retainer ring 30 having the opening 30o can be manufactured with high quality.

  In the above-described embodiment, the long hole-shaped opening is formed in the hole making step (opening forming step). However, the present invention is not limited to this, and any shape such as a circle, an ellipse, or a polygon can be used. An opening may be formed.

  In the embodiment described above, the opening 35o is formed so as not to be applied to the welded portion in the width direction of the ring body 35 in the drilling step (opening forming step), but even if a part of the opening covers the welded portion. I do not care.

  In the above-described embodiment, the R attaching step (chamfering step) is performed after the hole forming step (opening forming step). However, depending on the required quality, the R attaching step may be omitted.

  In the above-described embodiment, the cleaning / drying process is performed after the drilling process (opening forming process), but the cleaning process may be omitted depending on the construction method (for example, water cutter) of the drilling process. .

  In the embodiment described above, the aging / nitriding step is performed as the final step. However, depending on the required quality, the aging / nitriding step may be omitted.

  As described above, the manufacturing method of the endless ring of the present disclosure is the manufacturing method of the endless ring (30) for manufacturing the endless ring (30) used in the transmission belt (10) of the belt-type continuously variable transmission (1). A welding step (d) in which end portions of the band-shaped metal plate (31) are butted and welded to form an endless cylindrical body (32); and the cylindrical body (32) is a ring having a predetermined width. A cutting step (f) for cutting the body (33), a rolling step (i) for rolling the ring body (33), and a circumferential length adjusting step (l) for adjusting the circumferential length of the rolled ring body (34) And an opening forming step (m) for forming an opening (35o) in the ring body (34) having an adjusted circumference.

  In the manufacturing method of the endless ring according to the present disclosure, a welding process, a cutting process, a rolling process, and a circumferential length adjusting process are sequentially performed. And the opening formation process which forms the opening of a ring body is performed after a circumference adjustment process. Thereby, since there is no process accompanied by plastic deformation of the ring body (opening) such as a rolling process and a circumferential length adjusting process after the opening forming process, it is possible to easily ensure the dimensional accuracy of the opening. As a result, an endless ring having an opening can be manufactured with high quality.

  In such an endless ring manufacturing method of the present disclosure, a chamfering step (n) for chamfering the opening of the ring body (35) may be provided after the opening forming step (m). If it carries out like this, when tension | tensile_strength is applied to an endless ring, it can suppress that an excessive stress acts on an opening part, and can further improve the quality of an endless ring.

  The endless ring manufacturing method may include an aging / nitriding step (p) for performing an aging treatment and a nitriding treatment on the ring body (35) after the opening forming step (m). In this way, the surface of the endless ring can be reinforced to further improve its quality. In addition, an aging / nitriding process is performed after a chamfering process, when a chamfering process is provided in the manufacturing method of an endless ring.

  Furthermore, in the manufacturing method of the endless ring according to the present disclosure, the opening forming step (m) includes the opening (35o) at a position that does not contact the welded portion of the ring body (35) in the width direction of the ring body (35). It may be formed. If it carries out like this, when tension | tensile_strength is applied to an endless ring, it can suppress that an excessive stress acts on a welding part and an opening part, and can further improve the quality of an endless ring.

  Moreover, in the manufacturing method of the endless ring of the present disclosure, the main body portion (21) including the binding ring (12) and the saddle surface (23s) contacting the inner peripheral surface of the binding ring (12) and the saddle surface (23s). ) And a pair of hook portions projecting in the width direction of the saddle surface (23s) so as to be opposed to each other from the pillar portion (22). (22f) and a plurality of elements (20) arranged annularly by being supported by the binding ring (12), and as the endless ring, It is good also as what manufactures the retainer ring (30) arrange | positioned between the outer peripheral surface of a binding ring (12), and the internal peripheral surface of the said hook part (22f).

  Moreover, the endless ring of this indication is used for the transmission belt (10) of a belt-type continuously variable transmission (1), and is formed by butting | matching and welding the edge parts of a strip | belt-shaped metal plate (31). The gist of the ring (30) is that an opening (30o) is formed at a position that does not reach the welded portion (30w) of the endless ring (30) in the width direction of the endless ring (30).

  In the endless ring of the present disclosure, since the opening is formed at a position that does not reach the welded portion of the endless ring in the width direction of the endless ring, excessive stress is applied to the welded portion or the opening when tension is applied. The action can be suppressed, and the quality of the endless ring can be improved.

  In such an endless ring of the present disclosure, the binding ring (12), the body portion (21) including the saddle surface (23s) that contacts the inner peripheral surface of the binding ring (12), and the width direction of the saddle surface (23s) A pair of pillar portions (22) extending radially outward from both sides and a pair of hook portions (22f) projecting in the width direction of the saddle surface (23s) so as to face each other from the pillar portions (22); A plurality of elements (20) arranged annularly by being supported by the binding ring (12), and an outer peripheral surface of the binding ring (12). It is good also as what is a retainer ring (30) arrange | positioned between the internal peripheral surfaces of the said hook part (22f).

  As mentioned above, although the embodiment of the invention of the present disclosure has been described, the invention of the present disclosure is not limited to such an embodiment and can be implemented in various forms without departing from the gist of the invention of the present disclosure. Of course you can.

  The invention of the present disclosure can be used in the manufacturing industry of endless rings.

  DESCRIPTION OF SYMBOLS 1 Continuously variable transmission, 2 Primary shaft, 3 Primary pulley, 4 Secondary shaft, 5 Secondary pulley, 10 Transmission belt, 11 Ring material, 12 Laminated ring, 20 Element, 21 Main part, 22 Pillar part, 22f Hook part, 23 Recess, 23s saddle surface, 30, 130 retainer ring, 30w, 130w welded portion, 30o, 130o opening (long hole), 31 strip, 32 cylindrical body, 33-35 ring body, 35o opening, 40 hole punching device, 41, 42 Tension roller, 43, 44 Clamp, 45 head, 46 Collection unit.

The manufacturing method of an endless ring according to the present disclosure is mainly intended to enable an endless ring having an opening to be manufactured with high quality, and to suppress an excessively large stress from acting when a tension is applied . Moreover, the endless ring of this indication aims at suppressing that an excessive stress acts locally when tension | tensile_strength is applied.

An endless ring manufacturing method according to the present disclosure is an endless ring manufacturing method for manufacturing an endless ring used for a transmission belt of a belt-type continuously variable transmission, in which end portions of a belt-shaped metal plate are butted and welded endlessly. Welding step for forming the cylindrical body, a cutting step for cutting the cylindrical body into a ring body having a predetermined width, a rolling step for rolling the ring body, and a circumferential length for adjusting the circumferential length of the rolled ring body and adjusting step, the circumferential length adjusted for the ring body, and summarized in that comprising an opening forming step of forming an opening at a position not applied to the weld of the ring member in the width direction of the ring body.

In the manufacturing method of the endless ring according to the present disclosure, a welding process, a cutting process, a rolling process, and a circumferential length adjusting process are sequentially performed. And the opening formation process which forms an opening with respect to a ring body is performed after a circumference adjustment process. In the opening forming step, the opening is formed at a position that does not reach the welded portion of the ring body in the width direction of the ring body. Thereby, when tension | tensile_strength is applied to an endless ring, it can suppress that an excessive stress acts on a welding part and an opening part. Further, after the opening formation step, since there is no step of plastic deformation of the ring member, such as rolling and circumferential length adjusting step (opening), Ki de be easily secured the dimensional accuracy of the opening, it has an open port Ru der possible to produce an endless ring with high quality.

As described above, the manufacturing method of the endless ring of the present disclosure is the manufacturing method of the endless ring (30) for manufacturing the endless ring (30) used in the transmission belt (10) of the belt-type continuously variable transmission (1). A welding step (d) in which end portions of the band-shaped metal plate (31) are butted and welded to form an endless cylindrical body (32); and the cylindrical body (32) is a ring having a predetermined width. A cutting step (f) for cutting the body (33), a rolling step (i) for rolling the ring body (33), and a circumferential length adjusting step (l) for adjusting the circumferential length of the rolled ring body (34) If, for the ring member to adjust the circumferential length (35), an opening formation step of forming an opening (35o) in a position that does not overlap the welding portion of the ring body (35) in the width direction of the ring body (35) And (m).

In the manufacturing method of the endless ring according to the present disclosure, a welding process, a cutting process, a rolling process, and a circumferential length adjusting process are sequentially performed. And the opening formation process which forms an opening with respect to a ring body is performed after a circumference adjustment process. In the opening forming step, the opening is formed at a position that does not reach the welded portion of the ring body in the width direction of the ring body. Thereby, when tension | tensile_strength is applied to an endless ring, it can suppress that an excessive stress acts on a welding part and an opening part. Further, after the opening formation step, since there is no step of plastic deformation of the ring member, such as rolling and circumferential length adjusting step (opening), Ki de be easily secured the dimensional accuracy of the opening, it has an open port Ru der possible to produce an endless ring with high quality.

Claims (7)

An endless ring manufacturing method for manufacturing an endless ring used for a transmission belt of a belt type continuously variable transmission,
A welding process in which the ends of the band-shaped metal plates are butted together to form an endless tubular body;
A cutting step of cutting the cylindrical body into a ring body having a predetermined width;
A rolling step of rolling the ring body;
A circumference adjustment step for adjusting the circumference of the rolled ring body,
An opening forming step of forming an opening in the ring body having an adjusted circumference;
A method for manufacturing an endless ring. It is a manufacturing method of the endless ring according to claim 1,
A chamfering step of chamfering the opening of the ring body after the opening forming step;
A method for manufacturing an endless ring. A method for producing an endless ring according to claim 1 or 2,
After the opening formation step, the ring body includes an aging treatment and nitriding step for performing aging treatment and nitriding treatment,
A method for manufacturing an endless ring. A method for manufacturing an endless ring according to any one of claims 1 to 3,
In the opening forming step, the opening is formed at a position that does not reach the welded portion of the ring body in the width direction of the ring body.
A method for manufacturing an endless ring. A manufacturing method of an endless ring according to any one of claims 1 to 4,
A bundling ring, a main body portion including a saddle surface that contacts an inner peripheral surface of the bundling ring, a pair of pillar portions extending radially outward from both sides in the width direction on the saddle surface, and the pillar portions so as to face each other And a plurality of elements arranged annularly by being supported by the bundling ring and having a pair of hook portions protruding in the width direction of the saddle surface, and as the endless ring Manufacturing a retainer ring disposed between the outer peripheral surface of the binding ring and the inner peripheral surface of the hook portion;
A method for manufacturing an endless ring. An endless ring that is used for a transmission belt of a belt-type continuously variable transmission and formed by abutting and welding the end portions of a belt-shaped metal plate,
An opening is formed at a position that does not reach the welded portion of the endless ring in the width direction of the endless ring,
Endless ring. An endless ring according to claim 6,
A bundling ring, a main body portion including a saddle surface that contacts an inner peripheral surface of the bundling ring, a pair of pillar portions extending radially outward from both sides in the width direction on the saddle surface, and the pillar portions so as to face each other And a plurality of elements arranged in an annular shape by being supported by the binding ring and having a pair of hook portions protruding in the width direction of the saddle surface.
The retainer ring is disposed between the outer peripheral surface of the binding ring and the inner peripheral surface of the hook portion.
Endless ring.

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