JP2019032049A - Outside joint member for constant velocity universal joint, manufacturing method of outside joint member for constant velocity universal joint, and constant velocity universal joint - Google Patents

Abstract

To provide an outside joint member for constant velocity universal joint having higher strength and rigidity than a cylindrical FRP layer, a manufacturing method of the outside joint member, and a constant velocity universal joint.SOLUTION: An outside joint member for constant velocity universal joint comprises a metal body having a cup-shaped part, and a coating layer composed of FRP covering an outer diameter surface of the cup-shaped part of the metal body. The coating layer comprises an FRP-based helical winding layer provided over the whole outer diameter surface of the cup-shaped part of the metal body, and an FRP-based hoop winding layer disposed on at least an opening end part of the cup-shaped part. The hoop winding layer is provided one at least one of an inner diameter side and outer diameter side of the helical winding layer.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an outer joint member for a constant velocity universal joint, a method for manufacturing an outer joint member for a constant velocity universal joint, and a constant velocity universal joint.

  The constant velocity universal joint generally includes an outer ring as an outer joint member having a track groove formed on the inner diameter surface, an inner ring as an inner joint member having a track groove formed on the outer diameter surface, and a track groove and an inner ring of the outer ring. And a cage for holding the balls interposed between the inner diameter surface of the outer ring and the outer diameter surface of the inner ring.

  With the recent increase in environmental awareness and soaring gasoline, automobile manufacturers are aiming for significant weight reduction for the purpose of improving automobile fuel efficiency, and constant velocity universal joints are also required to be significantly reduced in weight. Therefore, conventionally, there has been one provided with an FRP layer that covers the outer diameter surface of the cup portion of the metal main body (Patent Document 1).

  Patent Document 1 relates to a tripod type constant velocity universal joint, and an FRP layer is formed on the outer diameter side of the cup portion. In this case, the FRP layer is wound until it reaches a predetermined thickness so as to be a layer having a winding angle of ± 5 to 90 ° with respect to the axial direction of the cup portion. That is, “the carbon fiber has anisotropy in strength, and the strength varies depending on the winding method. Basically, the carbon fiber is wound at a large angle (near 90 °) and wound around 45 ° against twisting. In addition, depending on the length of the cup portion, it is necessary to wind at a smaller angle with respect to 45 °, and therefore a range of ± 5 ° to 90 ° is preferable. ”

  For this reason, in the constant velocity universal joint described in Patent Document 1, it is possible to reduce the weight, and further, it is possible to enhance the strength on the pulled side and the strength against torsion.

JP 2010-2427779 A

  When forming the FRP layer, there are hoop winding and helical winding. Here, the hoop winding is a method of winding the fiber so that the angle formed by the central axis and the fiber winding direction is substantially perpendicular. Here, “substantially perpendicular” includes both 90 ° and an angle of around 90 ° that can be generated by shifting the winding position of the fibers so that the fibers do not overlap each other. Helical winding is a method of winding a fiber such that an angle formed by a central axis and a fiber winding direction is a predetermined angle.

  For this reason, in the said patent document 1, it consists only of a single layer as an FRP layer, and the hoop winding and the helical winding are mixed in this single layer. Therefore, in the FRP layer described in Patent Document 1, only the hoop winding or the helical winding corresponds to the opening of the outer joint member.

  By the way, a chamfer and a corner radius portion are provided on the outer diameter surface of the opening end portion of the outer joint member in order to reduce stress concentration. For this reason, the opening end portion of the outer joint member is less rigid with respect to the diameter expansion of the outer joint member when the constant velocity universal joint has a high operating angle. However, in the FRP layer described in Patent Document 1, as described above, only hoop winding or helical winding is supported. Therefore, when hoop winding is supported, the tensile strength is strengthened. When helical winding is supported, twisting is supported. Strengthening against strength. For this reason, when a constant velocity universal joint becomes a high operating angle, it does not become high rigidity with respect to the diameter expansion in the opening end part of an outer joint member.

  Further, as described in Patent Document 1, it is necessary to increase the thickness of the FRP layer so that the opening end portion of the outer joint member exhibits high rigidity using a single FRP layer. However, since the FRP layer is a single layer, it is necessary to cover the entire metal cup part with the thick FRP layer, and the outer joint member becomes larger in diameter and obstructs achievement of weight reduction. To do. In addition, the FRP layer having a large thickness is disposed even at a portion where the rigidity may be smaller than that of the opening end, resulting in an increase in cost.

  Accordingly, in view of the above problems, the present invention provides an outer joint member and an outer joint for a constant velocity universal joint that exhibit high rigidity even when the constant velocity universal joint expands at a high angle, and that can effectively achieve weight reduction. The manufacturing method of a member and a constant velocity universal joint are provided.

  The outer joint member for a constant velocity universal joint of the present invention includes a metal body having a bowl-shaped cup-shaped portion, and a constant-velocity provided with a coating layer made of FRP covering the outer diameter surface of the cup-shaped portion of the metal body. An outer joint member for a universal joint, wherein the coating layer is disposed on an FRP helical winding layer over the entire outer diameter surface of the cup-shaped portion of the metal main body, and at least an opening end of the cup-shaped portion. The hoop winding layer is provided on at least one of the inner diameter side and the outer diameter side of the helical winding layer. Here, the hoop winding is a method of winding the fiber so that the angle formed by the central axis and the fiber winding direction is substantially perpendicular. Here, “substantially perpendicular” includes both 90 ° and an angle of around 90 ° that can be generated by shifting the winding position of the fibers so that the fibers do not overlap each other. Also, the fiber is wound so that the angle formed by the central axis and the fiber winding direction is a predetermined angle.

  According to the outer joint member for a constant velocity universal joint of the present invention, the helical winding layer extends over the entire outer diameter surface of the cup-shaped portion of the metal main body, and the strength and rigidity against torsion are improved. Further, an FRP hoop winding layer is disposed at the opening end of the cup-shaped portion of the metal main body. In other words, the hoop winding layer is disposed in addition to the helical winding layer at the opening end portion of the outer joint member whose rigidity is reduced with respect to the diameter expansion.

  As the hoop winding layer, the hoop winding layer is not disposed in an unnecessary range because the hoop winding layer is disposed only at the opening end portion where the rigidity of the outer joint member becomes low. In particular, the hoop winding layer is preferably formed until it reaches at least the open end face of the cup-shaped portion. In addition, since the cup-shaped portion has a bowl shape, the coating layer also has a bowl shape. For this reason, it is possible to effectively avoid the covering layer from coming off to the joint opening side, and it is only necessary to provide the retaining layer on the stem portion side, which reduces the number of parts and the number of machining operations compared to the conventional product, and reduces the cost. Become.

  It is preferable that a concavo-convex shape portion for preventing peeling of the coating layer is formed on the outer diameter surface of the cup-shaped portion of the metal main body. Thus, if the uneven | corrugated shaped part is formed, peeling of a coating layer can be prevented effectively and it will be excellent in durability. Moreover, even if the uneven | corrugated shaped part is comprised by the groove | channel by machining or forge molding, it may be comprised by the uneven | corrugated | grooved part by an etching process. Here, the etching process is a process method of etching (melting process / chemical cutting) a workpiece by applying a chemical reaction / corrosion action by a chemical such as an etchant. Thus, the uneven | corrugated | grooved part for peeling prevention can be stably formed in a short time at low cost with various well-known and publicly available processing means.

  It is preferable that FRP (fiber reinforced resin) constituting the coating layer is CFRP (carbon fiber reinforced resin) or GFRP (glass fiber reinforced resin). CFRP is carbon fiber (carbon fiber) hardened with resin (generally epoxy resin), and GFRP is glass fiber hardened with polyester resin, vinyl ester resin, epoxy resin, phenol resin, etc. is there.

  A groove for mounting a boot may be formed on the outer diameter surface of the covering layer on the opening side. Thus, in the case where the groove for mounting the boot is formed, the boot mounting operation can be facilitated and the mounting strength can be improved.

  A constant velocity universal joint can be configured using the outer joint member for constant velocity universal joint.

  The method for manufacturing an outer joint member for a constant velocity universal joint according to the present invention includes a metal main body having a cup-shaped portion and a coating layer made of FRP covering the outer diameter surface of the cup-shaped portion of the metal main body. A method for manufacturing an outer joint member for a universal joint, wherein after the opening end surfaces of the cup-shaped portions of a pair of metal main bodies are butted together to form a butted body, at least the butted portions or the cup-shaped portions of both metal main bodies The inner end hoop winding layer is formed by covering the open end with FRP hoop winding, and then the inner hoop winding layer is covered with FRP helical winding so as to cover the entire outer diameter surface of both metal bodies. A helical winding layer is formed by coating, and then an outer hoop winding layer is formed by covering the helical winding layer in a range corresponding to the inner hoop winding layer by FRP hoop winding, Together In part, to separate the butt body by cutting the coating layer is for simultaneously forming two constant velocity universal joint outer joint member.

  According to the method of manufacturing the outer joint member for a constant velocity universal joint, two outer joint members having a metal main body and a coating layer made of FRP covering the outer diameter surface of the cup-shaped portion of the metal main body are manufactured simultaneously. can do. Moreover, a hoop winding layer can be easily formed to the opening end surface of the cup-shaped part of a metal main body.

  Moreover, the outer joint member has a metal main body and a coating layer made of FRP (fiber reinforced resin) that covers the outer diameter surface of the cup-shaped portion of the metal main body. An inner hoop winding layer made of FRP provided at the opening end of the cup-shaped portion, and a helical winding layer made of FRP covering the entire outer diameter surface of the cup-shaped portion of the metal main body and covering the inner hoop winding layer; The outer hoop winding layer made of FRP covers the outer diameter surface of the helical winding layer in the range corresponding to the inner hoop winding layer.

  In the outer joint member of the present invention, the helical winding layer extends over the entire outer diameter surface of the cup-shaped portion of the metal body, and the strength and rigidity against torsion are improved. Furthermore, since the opening end of the cup-shaped portion of the metal main body is provided with a hoop winding layer made of FRP in addition to the helical winding layer, the constant velocity universal joint using this outer joint member has a high operating angle. The rigidity is high with respect to the diameter expansion at the opening end portion of the outer joint member.

  In addition, a hoop winding layer capable of enhancing the tensile strength is disposed only in a necessary portion, which can contribute to a reduction in weight by preventing an increase in diameter and a reduction in cost. . Furthermore, since the FRP layer is formed in a bowl shape, it is not necessary to provide a retaining structure on the joint opening side, and the number of parts and the number of machining can be reduced, thereby reducing the cost. .

  In the constant velocity universal joint of the present invention, an outer joint member having high strength and high rigidity can be used, and a constant velocity universal joint that is lightweight and excellent in high strength and high rigidity can be provided.

  In the manufacturing method of the outer joint member for a constant velocity universal joint, two outer joint members can be manufactured at the same time, the cycle time at the time of manufacturing can be shortened, and the productivity is excellent. Moreover, the manufactured outer joint member is the outer joint member according to the present invention, and since the hoop winding layer reaches the opening end surface, it is lightweight and has excellent high strength and high rigidity.

It is sectional drawing of the outer joint member of this invention. It is a front view of the outer joint member shown in FIG. The outer joint member shown in FIG. 1 is shown, (a) is the A section expanded sectional view of FIG. 1, (b) is the B section expanded sectional view of FIG. It is sectional drawing of the constant velocity universal joint using the outer joint member shown in FIG. It is a perspective view of the 1st metal main body. It is a perspective view of the 2nd metal main body. It is a perspective view of the 3rd metal main body. It is a side view of the butt | matching body which shows the manufacturing process of the outer joint member of this invention, and butt | matches a pair of metal main bodies. The manufacturing process of the outer joint member of this invention is shown, the state which formed the inner hoop winding layer in the butt | matching body is shown, (a) is a side view of an outer joint member, (b) is a principal part expansion of an outer joint member It is sectional drawing. The manufacturing process of the outer joint member of this invention is shown, the state which formed the helical winding layer in the butt | matching body, (a) is a side view of an outer joint member, (b) is the principal part expanded cross section of an outer joint member FIG. The manufacturing process of the outer joint member of this invention is shown, the state which formed the outer hoop winding layer in the butt | matching body is shown, (a) is a side view of an outer joint member, (b) is a principal part expansion of an outer joint member It is sectional drawing. The manufacturing process of the outer joint member of this invention is shown, the state which isolate | separated the butt | matching body in which the resin layer was formed is shown, (a) is a side view of an outer joint member, (b) is the principal part of an outer joint member It is an expanded sectional view. The manufactured outer joint member is shown, (a) is a side view of the outer joint member, and (b) is an enlarged sectional view of a main part of the outer joint member. The manufacturing process of the outer joint member of this invention is shown, (a) is a principal part expanded sectional view of the butt | matching body in which the coating layer was formed, (b) of one outer joint member of the state which cut | disconnected the resin layer It is a principal part expanded sectional view, (c) is a principal part expanded sectional view of one outer joint member of the state which formed the boot mounting part. It is a simplified perspective view which shows a filament winding method. It is a simplified perspective view showing a sheet winding method. It is explanatory drawing of hoop winding. It is explanatory drawing of helical winding. 1 shows a method of manufacturing an outer joint member by forming a coating layer on one metal body, (a) is an enlarged cross-sectional view of the main part of the outer joint member in a state where the coating layer is formed, and (b) is an opening end of the outer joint member. It is a principal part expanded sectional view of the outer joint member of the state which cut | disconnected the resin layer, (c) is a principal part expanded sectional view of the outer joint member of the state which formed the boot mounting part. It is a principal part expanded sectional view of the other outer joint member of this invention. It is a principal part expanded sectional view of another outer joint member of this invention.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 and 2 show an outer joint member according to the present invention, and FIG. 4 shows a constant velocity universal joint using the outer joint member.
This constant velocity universal joint includes an outer joint member 3 in which a plurality of (e.g., eight) track grooves 2 are formed along the axial direction on the inner diameter surface 1 of the cup portion 21, and the outer joint member 3 on the outer diameter surface 4. An inner joint member 6 in which a plurality of (e.g., eight) track grooves 5 paired with the track groove 2 are formed along the axial direction, the track groove 2 of the outer joint member 3, and the track groove 5 of the inner joint member 6. Between a plurality of (e.g., eight) torque transmitting members 7 that transmit torque by being interposed between the inner diameter surface 1 of the outer joint member 3 and the outer diameter surface 4 of the inner joint member 6. And a cage 8 having a pocket 9 for holding the ball 7.

  On the inner diameter surface of the hole 10 of the inner joint member 6, a female serration (female spline) 10a that is a torque transmission part is formed. That is, the shaft 11 is fitted into the hole 10 of the inner joint member 6, and the male serration 11 a provided on the shaft 11 is fitted to the female spline 10 a of the inner joint member 6. Thereby, the torque between the shaft 11 and the inner joint member 6 is transmitted.

  The open end of the outer joint member 3 is sealed with a boot 13. The boot 13 includes a large-diameter portion 13a attached to the outer periphery of the opening end of the outer joint member 3, a small-diameter portion 13b attached to the shaft 11, and a bellows portion 13c disposed therebetween. A boot mounting portion 15 having a concave groove 15 a is formed on the outer diameter surface of the opening of the outer joint member 3, and a boot mounting portion 16 having a concave groove 16 a is also formed on the shaft 11. Band fitting grooves 17 and 18 are provided in the large diameter portion 13a and the small diameter portion 13b of the boot 13, respectively.

  For this reason, the large-diameter portion 13a of the boot 13 is externally fitted to the boot mounting portion 15 of the outer joint member 3, and the boot band 19 is fitted into the band fitting groove 17 of the large-diameter portion 13a. The diameter portion 13 a can be fixed to the boot mounting portion 15 of the outer joint member 3. Further, the small-diameter portion 13b of the boot 13 is externally fitted to the boot mounting portion 16 of the shaft 11, and the boot band 19 is fitted into the band fitting groove 18 of the small-diameter portion 13b. It can be fixed to the boot mounting portion 16. A retaining ring 20 for retaining the shaft is attached to the end of the male spline 11a of the shaft 11.

  As shown in FIG. 1, the outer joint member 3 includes a metal main body 23 having a bowl-shaped cup-shaped portion 23a, and a coating layer 24 made of FRP that covers the outer diameter surface of the cup-shaped portion 23a of the metal main body. Have In addition, the stem part 22 protrudes from the bottom wall 23a1 of the cup-shaped part 23a. As shown in FIG. 2, the cup-shaped portion 23 a of the metal main body 23 has eight track grooves 2 formed along the axial direction on the inner diameter surface 1 thereof. The cup-shaped portion 23 a of the metal main body 23 and the covering layer 24 constitute a bowl-shaped cup portion 21 of the outer joint member 3.

  As shown in FIG. 1, the covering layer 24 includes an FRP inner hoop winding layer 24 </ b> A provided on the outer diameter surface of the opening of the cup-shaped portion 23 a of the metal main body 23, and the cup-shaped portion 23 a of the metal main body 23. An FRP helical winding layer 24B covering the entire outer diameter surface of the inner hoop winding layer 24A and an FRP outer hoop covering the outer diameter surface of the helical winding layer 24B in a range corresponding to the inner hoop winding layer 24A. It is comprised with the winding layer 24C. The outer peripheral surface of the outer hoop winding layer 24 </ b> C becomes the boot mounting portion 15 having the concave groove 15 a.

  In this case, as shown in FIG. 3A, the hoop winding layers 24 </ b> A and 24 </ b> C are provided until reaching the opening end face of the cup-shaped portion 23 a of the metal main body 23. In other words, the hoop winding layers 24A and 24C can be formed in addition to the helical winding layer 24B in a portion where the rigidity against diameter expansion tends to be low when the operating angle is high.

  Further, as shown in FIG. 3B, a contact surface portion 26 with which the small-diameter side edge 24a of the coating layer 24 contacts is formed on the outer diameter surface of the bottom wall 23a1 of the cup-shaped portion 23a of the metal main body 23. Is done. For this reason, the thickness of the metal main body 23 can be formed smaller than the thickness of the cup portion of the existing outer joint member of this type that does not have the coating layer 24. The metal main body 23 is made of, for example, medium carbon steel.

  As shown in FIG. 1, the covering layer 24 includes an FRP inner hoop winding layer 24 </ b> A provided on the outer diameter surface of the opening of the cup-shaped portion 23 a of the metal main body 23, and the cup-shaped portion 23 a of the metal main body 23. An FRP helical winding layer 24B covering the entire outer diameter surface of the inner hoop winding layer 24A and an FRP outer hoop covering the outer diameter surface of the helical winding layer 24B in a range corresponding to the inner hoop winding layer 24A. It is comprised with the winding layer 24C. The outer peripheral surface of the outer hoop winding layer 24 </ b> C becomes the boot mounting portion 15 having the concave groove 15 a.

  Here, FRP (Fiber Reinforced Plastics) is obtained by reinforcing plastic with fibers. FRP is called GFRP (glass fiber reinforced plastic), CFRP (carbon fiber reinforced plastic), AFRP, or KFRP (aramid fiber reinforced plastic) depending on the fiber used. The resin to be used is typically a thermosetting resin such as an unsaturated polyester resin, an epoxy resin, or a phenol resin, but a thermoplastic resin such as polypropylene, nylon, or polycarbonate can also be used.

  In general, FRP has the properties described below. Excellent weather resistance, heat resistance and chemical resistance. Furthermore, it has electrical insulation and excellent radio wave transmission. In addition, it has excellent heat insulation properties, can be used for various shapes, can be freely colored, and is lightweight and excellent in strength.

  The inner hoop wound layer 24A, the helical wound layer 24B, and the outer hoop wound layer 24C are formed by FRP infiltrated with a synthetic resin agent by a filament winding method or a sheet winding method.

  Here, the filament winding method is a method in which a carbon fiber (fiber bundle) impregnated with resin is wound around a mandrel, molded, heated and cured, and then the mandrel is removed. “Sheet winding” is to wind a sheet instead of a bundle of fibers.

  In the filament winding method, for example, a filament winding apparatus 50 shown in FIG. 15 is used. The filament winding apparatus 50 includes a plurality of bobbins 51 that supply the reinforcing fiber bundle f, a resin tank 52, and a traverse device 53. That is, the reinforcing fiber bundle f is sent out from each bobbin 51 and is impregnated with resin in the resin tank 52 to form a resin-impregnated reinforcing fiber bundle F. The resin-impregnated reinforcing fiber bundle F rotates via the traverse device 53. Supplied to mandrel 54. Accordingly, the reinforcing fiber bundle F is wound around the outer peripheral surface of the mandrel 54 to form a fiber reinforced resin layer, and the fiber reinforced resin layer is heated and cured.

  In the sheet winding method, as shown in FIG. 16, first, a sheet-like material in which carbon fiber called prepreg 65 is impregnated with resin is formed, and a mandrel (core bar) 67 and the prepreg 65 are interposed between a plurality of rolls 66. And wind the prepreg 65 on the mandrel 67. Further, the type and angle of the prepreg 65 are changed, and the prepreg 65 is sequentially wound to form a laminated structure as designed. Thereafter, the formed fiber reinforced resin layer is heated and cured.

  That is, as shown in FIG. 17, hoop winding is substantially perpendicular to the axial direction (arrow X) of the substrate 70 (around 90 ° which can be generated by shifting the fiber winding position so that the fibers do not overlap each other) The fiber 71 containing the matrix resin is wound around the angle. In addition, as shown in FIG. 18, the helical winding is a matrix resin in which the angle formed by the central axis and the fiber winding direction is a predetermined angle along the axial direction (arrow X) of the base material 70. The contained fiber 71 is spirally wound.

  Next, a method for manufacturing the outer joint member 3 will be described. First, a metal main body 23 having a stem portion 22 and a cup-shaped portion 23a as shown in FIGS. 5 to 7 is formed. In this case, in the metal main body 23 shown in FIG. 5, the outer diameter surface has a convex curved surface that does not have an uneven portion, but in the metal main body 23 shown in FIG. 6, the outer diameter surface has an axial direction. A plurality of extending concave grooves 30 are formed. The metal main body 23 shown in FIG. 7 is provided with concave and convex portions 31 in which concave portions 31a extending in the axial direction and convex portions 31b extending in the axial direction are alternately provided along the circumferential direction.

  For the concave groove 30 and the concavo-convex portion 31, groove formation by machining, forging, or the like, concavo-convex formation by etching, or the like can be employed. Such concave grooves 30 and concave / convex portions 31 constitute the concave / convex shape portions 34 for preventing peeling of the coating layer 24.

  As shown in FIG. 8, the metal body 23 with two stem portions formed in this way forms an abutting body M formed by abutting the opening end surfaces 35 and 35. In FIG. 8, the metal main body 23 that does not have the uneven portion 34 for preventing the peeling of the coating layer 23 is used as shown in FIG. 5, but of course, the metal main body 23 shown in FIGS. 6 and 7 is used. May be used.

  Next, as shown in FIGS. 9 (a) and 9 (b), from the outer diameter surface of the opening of the cup-shaped portion 23a of one metal main body 23, beyond the butting portion 36 where the opening end surface 35 is butted. The inner hoop winding layer 38 </ b> A is formed by covering with an FRP hoop winding in a range reaching the outer diameter surface of the opening of the cup-shaped portion 23 a of the other metal main body 23. Thereafter, as shown in FIGS. 10 (a), 10 (b), and 14 (a), the inner hoop winding layer 38A is covered with the FRP helical winding so as to cover the entire outer diameter surfaces of both metal bodies 23, 23. The helical winding layer 38B is formed by coating. Next, as shown in FIGS. 11A and 11B, the outer hoop winding layer 38C is formed by covering the helical winding layer 38B in a range corresponding to the inner hoop winding layer 38A by FRP hoop winding.

  By the way, as shown in FIG. 14, since the rounded portion 23a2 is formed at the opening edge of the outer diameter surface of the cup-shaped portion 23a of the metal main body 23, the inner hoop winding layer 38A has an axial center portion. A recess 38A1 is formed, and a recess 38B1 is formed at the axially central portion of the helically wound layer 38B. Furthermore, a recess 38C1 is formed in the axially central portion of the outer hoop winding layer 38C.

  After that, as shown in FIGS. 12A, 12B, 14B, and 14C, the butt body M is separated by cutting the coating layer 24 at the butt portion 36 of the butt body M to separate the butt body M. The outer joint members 3 for constant velocity universal joints are molded simultaneously. In the butted body M before separation, the inner hoop wound layer 38A corresponds to the inner hoop wound layer 24A in the separated outer joint members 3 and 3, and the helical wound layer in the separated outer joint members 3 and 3 is separated. The helical winding layer 38B corresponds to 24B, and the outer hoop winding layer 38C corresponds to the outer hoop winding layer 24C in the separated outer joint members 3 and 3.

  That is, the inner hoop winding layer 38A is cut at its axial intermediate portion to form the inner hoop winding layers 24A and 24A of the outer joint members 3 and 3, and the helical winding layer 38B is cut at its axial intermediate portion. Helical winding layers 24B and 24B of the outer joint members 3 and 3 are formed, and the outer hoop winding layer 38C is cut at an intermediate portion in the axial direction, and the outer hoop winding layers 24C of the outer joint members 3 and 3 are cut. 24C is formed.

  Thereafter, in each outer joint member 3, 3, as shown in FIGS. 13A and 13B, the outer hoop winding layer 24 </ b> C is provided with a concave groove 15 a by machining or the like to form the boot mounting portion 15. At the same time, a rounded portion 21a is formed at the opening edge of the outer diameter surface of the outer hoop winding layer 24C or the opening edge of the outer diameter surface of the helical winding layer 24B.

  By the way, in the said embodiment, although the case where the two outer joint members 3 were manufactured simultaneously was shown, in FIG. 19, the case where one outer joint member 3 is manufactured using one metal main body is shown. ing. In this case, as shown in FIG. 19A, the inner hoop winding layer 24A is formed so as not to cover the round portion 23a2 of the metal main body 23, and the helical winding layer 24B is formed from the round portion 23a2 to the opening of the metal main body 23. The end surface 23a3 is covered so as to cover it. Further, the outer hoop winding layer 24C is formed so as not to cover the corner portion 24B1 of the helical winding layer 24B.

  After that, as shown in FIG. 19B, the helical wound layer 24B is cut along the end surface of the metal main body 23, and then recessed by machining or the like as shown in FIG. 19C. The groove 15a is provided to form the boot mounting portion 15, and the rounded portion 21a is formed at the opening edge of the outer diameter surface of the outer hoop winding layer 24C or the opening edge of the outer diameter surface of the helical winding layer 24B.

  As shown in FIG. 19, when one outer joint member 3 is manufactured using one metal main body 23, the helical winding layer 24 </ b> B is bent at the rounded portion 23 a 2 to the opening end surface 23 a 3 of the metal main body 23. Therefore, it is necessary to wind the metal body 23 so as to close the opening. For this reason, removal processing (removal operation) of the helically wound layer 24 </ b> B covering the opening of the metal main body 23 must be performed. Therefore, when one outer joint member 3 is manufactured using one metal main body 23, the winding operation at the time of forming the helical winding layer 24B is difficult even if the filament winding method or the sheet winding method is used. In addition, the yield for removal is poor and the cost is high.

  On the other hand, when two outer joint members 3 are manufactured at the same time, a stable winding operation can be performed even with the filament winding method or the sheet winding method. Moreover, it is not necessary to perform a winding operation so as to cover the opening portion of the metal main body 23 and a removal operation of the helical winding layer 24B covering the opening portion of the metal main body 23, and it is excellent in productivity and cost reduction. Can be planned. In particular, when the two outer joint members 3 and 3 are manufactured at the same time, the hoop winding layer can be stably formed until the opening end surface of the cup-shaped portion is reached.

  In the outer joint member of the present invention, the helical winding layer 24B extends over the entire outer diameter surface of the cup-shaped portion 23a of the metal main body 23, and the strength and rigidity against twisting are improved. Further, since the open end of the cup-shaped portion 23a of the metal main body 23 is provided with a hoop winding layer 24A (24C) made of FRP in addition to the helical winding layer 24B, a constant velocity using this outer joint member is used. The universal joint has high rigidity with respect to the diameter expansion at the opening end portion of the outer joint member 3 when a high operating angle is obtained.

  As the hoop winding layer 24A (24C), the hoop winding layer is not arranged in an unnecessary range because the hoop winding layer 24A (24C) is arranged only at the opening end where the rigidity is reduced with respect to the diameter expansion of the opening end of the outer joint member 3. . That is, the hoop winding layer 24A (24C) capable of enhancing the tensile strength is disposed only in a necessary portion, which can contribute to weight reduction by preventing an increase in diameter and at a low cost. It also contributes to the transformation.

  Furthermore, since the cup-shaped portion 23a has a bowl shape, the coating layer 24 also has a bowl shape. For this reason, it is possible to effectively avoid the covering layer 24 from coming off to the joint opening side, and it is only necessary to provide it on the stem portion side as a stopper, and the number of parts and the number of machining processes are reduced compared to the conventional product, resulting in low cost. It becomes.

  It is preferable that a concavo-convex shape portion 34 for preventing peeling of the coating layer 24 is formed on the outer diameter surface of the cup-shaped portion 23 a of the metal main body 23. Thus, if the uneven | corrugated shaped part 34 is formed, peeling of the coating layer 24 can be prevented effectively and it will be excellent in durability. Moreover, the uneven | corrugated shaped part 34 may be comprised by the groove | channel by machining or forge molding, or may be comprised by the uneven | corrugated | grooved part by an etching process. Here, the etching process is a process method of etching (melting process / chemical cutting) a workpiece by applying a chemical reaction / corrosion action by a chemical such as an etchant. Thus, the uneven | corrugated shaped part 34 for peeling prevention can be stably formed in a short time at low cost with various well-known and publicly available processing means.

  The FRP (fiber reinforced resin) constituting the coating layer 24 is preferably CFRP (carbon fiber reinforced resin) or GFRP (glass fiber reinforced resin). CFRP is carbon fiber (carbon fiber) hardened with resin (generally epoxy resin), and GFRP is glass fiber hardened with polyester resin, vinyl ester resin, epoxy resin, phenol resin, etc. is there.

  A groove 15a for mounting a boot may be formed on the outer diameter surface of the covering layer 24 on the opening side. As described above, in the case where the recessed groove 15a for mounting the boot is formed, the boot mounting operation can be facilitated and the mounting strength can be improved.

  In the constant velocity universal joint of the present invention, the constant velocity universal joint can be configured using the outer joint member for the constant velocity universal joint, so that it has higher strength and higher rigidity than the case where it is covered with the single FRP layer 24. The outer joint member thus obtained can be used, and a constant velocity universal joint that is lightweight and has high strength and high rigidity can be provided.

  In the manufacturing method of the outer joint member for a constant velocity universal joint, the two outer joint members 3 and 3 can be manufactured at the same time, the cycle time at the time of manufacturing can be shortened, and the productivity is excellent. And the manufactured outer joint member is the outer joint member 3 which concerns on this invention, and since it exists until a hoop winding layer reaches an opening end surface, it will be lightweight and will be excellent in high intensity | strength and high rigidity.

  By the way, in the said embodiment, although the inner side hoop winding layer 24A and the outer side hoop winding layer 24C were provided as the hoop winding layer 24, as shown in FIG. 20, the outer side hoop winding layer 24C was abbreviate | omitted. Even if only the inner hoop winding layer 24A is provided, as shown in FIG. 21, the inner hoop winding layer 24A may be omitted and only the outer hoop winding layer 24C may be provided.

  When the outer joint member shown in FIG. 20 is manufactured, the steps shown in FIGS. 11A and 11B may be omitted. When the outer joint member shown in FIG. 21 is manufactured, the steps shown in FIGS. The steps shown may be omitted. Thus, even if it is only the inner hoop winding layer 24A or only the outer hoop winding layer 24C, it has higher strength and higher rigidity than those without such inner hoop winding layers 24A and 24C. It will be excellent.

  As described above, the embodiments of the present invention have been described. However, the present invention is not limited to the above-described embodiments, and various modifications can be made. The constant velocity universal joint may be a fixed type constant velocity universal joint. A sliding type constant velocity universal joint may be used. In the embodiment, the fixed type constant velocity universal joint is a bar field type, but an undercut free type constant velocity universal joint may be used. Further, the sliding type constant velocity universal joint may be a double offset type constant velocity universal joint, a cross groove type constant velocity universal joint (LJ), or the like. When a cross groove type constant velocity universal joint is used, a float type or a non-float type may be used. When a tripod type constant velocity universal joint is used, a single roller type or a double roller type may be used.

  Further, as the axial lengths of the inner hoop winding layer 24A and the outer hoop winding layer 24C (joint axial length), such hoop winding layer 24A, based on the material used, the winding method, the strength of each layer, etc. The length may be such that the function and effect obtained by providing 24B may be achieved, or the entire outer diameter surface of the cup-shaped portion 23 may be provided like the helically wound layer 24B. The axial lengths of the inner hoop winding layer 24A and the outer hoop winding layer 24C may be the same or different. Furthermore, as the thickness dimension (thickness dimension) of the inner hoop winding layer 24A, the helical winding layer 24B, and the outer hoop winding layer 24C, each can be arbitrarily set, but the material used, the winding method, the strength of each layer, In addition, the thickness can be determined in consideration of the thickness of the cup-shaped portion of the metal main body. Further, the inner hoop winding layer 24A, the helical winding layer 24B, and the outer hoop winding layer 24C may be the same or different in thickness. Specifically, when all the layers have the same wall thickness, when the inner hoop winding layer 24A and the outer hoop winding layer 24C have the same wall thickness and the helical winding layer 24B is different, the inner hoop winding layer 24A and the helical winding layer 24C differ. When the layer 24B has the same thickness and the outer hoop winding layer 24C is different, the outer hoop winding layer 24C and the helical winding layer 24B may have the same thickness and the inner hoop winding layer 24A may be different.

15a Concave groove 21 Cup part 22 Stem part 23 Metal main body 23a Cup-shaped part 24 Cover layer 24A Inner hoop winding layer 24B Helical winding layer 24C Outer hoop winding layer 30 Concave groove 31 Concavity and convexity 34 Concavity and convexity part 35 Open end face 36 Part 38A Inner hoop winding layer 38B Helical winding layer 38C Outer hoop winding layer

Claims (8)

An outer joint member for a constant velocity universal joint comprising a metal body having a bowl-shaped cup shape and a coating layer made of FRP covering the outer diameter surface of the cup-shaped portion of the metal body,
The covering layer includes an FRP helical winding layer extending over the entire outer diameter surface of the cup-shaped portion of the metal body, and an FRP hoop winding layer disposed at least at an opening end of the cup-shaped portion. The hoop winding layer is provided on at least one of the inner diameter side and the outer diameter side of the helical winding layer, and the outer joint member for a constant velocity universal joint.   2. The outer joint member for a constant velocity universal joint according to claim 1, wherein the hoop winding layer is formed until it reaches at least an opening end face of the cup-shaped portion.   The hoop winding layer includes an inner hoop winding layer disposed on an inner diameter side of the helical winding layer, and an outer hoop winding layer disposed on an outer diameter side of the helical winding layer. The outer joint member for constant velocity universal joints of Claim 1 or Claim 2.   4. The constant velocity universal joint according to claim 1, wherein an uneven shape portion for preventing peeling of the coating layer is formed on an outer diameter surface of the cup shape portion of the metal main body. 5. Outer joint member.   The outer joint member for a constant velocity universal joint according to claim 4, wherein the concavo-convex shape portion is configured by a concave groove formed by machining or forging.   The outer joint member for a constant velocity universal joint according to claim 5, wherein the concavo-convex shape portion is formed by an concavo-convex portion formed by etching.   The constant velocity universal joint using the outer joint member for constant velocity universal joints of any one of the said Claims 1-6. A method for producing an outer joint member for a constant velocity universal joint comprising a metal body having a cup-shaped portion and a coating layer made of FRP covering the outer diameter surface of the cup-shaped portion of the metal body,
After the opening end surfaces of the cup-shaped portions of the pair of metal main bodies are butted together to form a butted body, at least the opening end portions of the butted portions or the cup-shaped portions of the two metal main bodies are covered with FRP hoop winding. The inner hoop winding layer is formed, and then the outer hoop surface of both metal bodies is covered with the FRP helical winding to cover the inner hoop winding layer to form the helical winding layer. After forming the outer hoop winding layer by covering the helical winding layer in the range corresponding to the inner hoop winding layer, the butt body is cut at the butt portion of the butt body to cut the coating layer. And manufacturing two outer joint members for a constant velocity universal joint at the same time.

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