JP2013098124A - High-frequency heat treatment coil, outer joint member for constant velocity universal joint, and constant velocity universal joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high-frequency heat treatment coil which can be assembled with high dimension accuracy and to which high quality heat treatment can be applied, and to provide a constant velocity universal joint subjected to the high quality heat treatment, and a drive shaft and a propeller shaft using the constant velocity universal joint.SOLUTION: The method of manufacturing a high-frequency heat treatment coil having heating sections 71a, 71b, 71c for heating heating processing portions of an outer joint member 51 for a constant velocity universal joint is provided. The heating sections 71a, 71b, 71c are molded by machining in an integrated manner, and the high-frequency heat treatment coil is completed by joining the heating sections 71a, 71b, 71c with the other sections.

Description

  The present invention relates to a high frequency heat treatment coil, an outer joint member for a constant velocity universal joint, and a constant velocity universal joint.

  In a constant velocity universal joint used for a power transmission device such as an automobile or various industrial machines, an outer joint member 210, a tripod member 220 as an inner joint member, and a roller 230 constitute a main part. One shaft (drive shaft) of the drive side and the driven side to be coupled extends integrally from the bottom of the outer joint member 210, and the other shaft (not shown) is coupled to the tripod member 220.

  The outer joint member 210 has a bottomed cylindrical shape with one end opened, and three track grooves 212 extending in the axial direction are formed on the inner periphery thereof at equal intervals in the circumferential direction. The tripod member 220 has three leg shafts 224 protruding radially outward from the cylindrical boss portion 222, and these leg shafts 224 are inserted into the track grooves 212 of the outer joint member 210, and are engaged with the track grooves 212. Combine torque transmission. A roller 230 is rotatably fitted to the leg shaft 224 via a needle roller 240, and the roller 230 rolls along a pair of roller guide surfaces 214 facing each other in the track groove 212, thereby connecting two shafts. Smooth the angular displacement and axial displacement between.

  FIG. 13 is a partially enlarged view of FIG. 11 and shows the leg shaft 224, the needle rollers 240 and the rollers 230. The outer peripheral surface of the leg shaft 224 constitutes the inner rolling surface of the needle roller 240, and the inner peripheral surface of the roller 230 constitutes the outer rolling surface of the needle roller 240. The plurality of needle rollers 240 are disposed between the outer peripheral surface of the leg shaft 224 and the inner peripheral surface of the roller 230 in a full roller state.

  These needle rollers 240 are in contact with the inner washer 250 externally fitted to the base portion of the leg shaft 224 on the radially inner side, and are in contact with the outer washer 260 externally fitted on the distal end portion of the leg shaft 224 on the radially outer side. Yes. The outer washer 260 is prevented from coming off by fitting a retaining ring 270 such as a circular circlip into an annular groove 226 formed at the tip of the leg shaft 224.

  Such metal parts such as the outer joint member of the constant velocity universal joint are subjected to thermosetting treatment for the purpose of increasing the strength and the like. There is a high-frequency heat treatment method as a thermosetting method. In the induction heat treatment, a coil suitable for each product is used depending on the product shape, quenching depth, quenching range, and the like.

  Conventionally, there is a high frequency induction heating coil using a metal tube such as copper (Patent Document 1). Such a metal tube is assembled by brazing a plurality of parts made of copper with silver solder or the like.

  That is, the high frequency induction heating coil for the outer joint member of the tripod type constant velocity universal joint shown in FIG. 7 and the like is assembled by molding a plurality of parts shown in FIG.

  In this case, the coil 10 includes heating units 1a, 1b, and 1c that are fitted into three track grooves. The heating parts 1a, 1b, 1c are hollow so that cooling water flows through the inside. That is, each heating part 1a, 1b, 1c includes an inverted U-shaped heating part main body 2, a connecting member 3a, 3b, 3c, 3d for connecting the lower ends of the heating part main body 2, and an upper wall of the heating part main body 2. Cover members 4a, 4b, 4c for closing the openings of the cover members, cover members 5a, 5b, 5c, 5d for closing the lower openings of the connecting members 3a, 3b, 3c, 3d, and the heating part body 2 of the heating part body 2 It consists of inner flange parts 6a, 6b, 5c connected to the upper wall part. For this reason, it consists of 17 parts in total.

JP 2010-86904 A

  By the way, when brazing each component formed of such a copper material, for example, a component heated to 600 ° C. or higher is silver brazed. At this time, it is preferable to assemble the jig 11 as shown in FIG. 6 in order to fix the components and to suppress deformation and distortion due to heating. The jig 11 is formed of a cylindrical body whose inner diameter portion corresponds to the inner diameter portion of the mouth portion of the outer joint member of the tripod type constant velocity universal joint that is a member to be heated.

  However, the coil 10 as shown in FIG. 5 has a large number of parts and a large number of brazed portions. For this reason, even if the restraining jig 11 as shown in FIG. 6 is used, in order to assemble with high dimensional accuracy, a skilled brazing technique and a long working time are required, resulting in high costs.

  Therefore, in view of such circumstances, the present invention provides a high-frequency heat treatment coil that can be assembled with high dimensional accuracy and can perform high-quality heat treatment, and a method of manufacturing such a high-frequency heat treatment coil. Another object of the present invention is to provide a constant velocity universal joint subjected to high-quality heat treatment, and a drive shaft and a propeller shaft using such a constant velocity universal joint.

  The method for manufacturing a high-frequency heat treatment coil according to the present invention is a method for manufacturing a high-frequency heat treatment coil having a heating portion for heating a heat treatment portion of an outer joint member for a constant velocity universal joint, wherein the heating portion is integrally machined. And is completed by joining the heating part and other parts.

  The high frequency heat treatment coil of the present invention is a high frequency heat treatment coil having a heating portion for heating a heat treatment portion of an outer joint member for a constant velocity universal joint, and the heating portion is formed by integral machining. Is.

  According to the high-frequency heat treatment coil of the present invention, since the joining part at the time of assembly is other than the heating part, the dimensional accuracy of the heating part is not lowered due to joining (for example, brazing joining). That is, the part necessary for heating is integrally formed by machining, and the influence of deformation and distortion accompanying brazing can be suppressed to a low level, and the assembled coil can maintain high accuracy.

The induction heat treatment coil can be used for induction hardening and induction tempering.
Induction hardening is hardening using high-frequency induction heating, and the principle of heating conductive objects by placing Joule heat in a coil where high-frequency current is flowing, and generating Joule heat by electromagnetic induction action. This is an applied quenching method. Moreover, induction tempering is tempering using induction heating, and is a method of cooling with a refrigerant (cooling water or the like) after induction heating. That is, as the high frequency heat treatment, for the purpose of surface hardening of the entire surface or part of the steel product, it is heated to an appropriate temperature above the Ac3 or Ac1 point by induction heating, and then cooled (quenched) with an appropriate coolant. In order to adjust the hardness and increase the toughness (toughness), it is preferable to heat in a normal tempering furnace to an appropriate temperature below the Ac1 point and then cool (temper).

  The outer joint member for a constant velocity universal joint of the present invention is heat treated using the high frequency heat treatment coil.

  As an outer joint member for a constant velocity universal joint, three track grooves extending in the axial direction are provided on the inner periphery, and guide surfaces facing each other are provided on the inner wall of each track groove. It may be for a tripod type constant velocity universal joint in which an inner diameter portion is formed.

  The constant velocity universal joint of the present invention uses the outer joint member for the constant velocity universal joint.

  The drive shaft of the present invention uses the constant velocity universal joint, and the propeller shaft of the present invention uses the constant velocity universal joint. The drive shaft is an axle that transmits the rotational force of the engine from the differential gear to the tire. The propeller shaft means a propulsion shaft, and is a rotating shaft that runs back and forth in the center of the vehicle body of an FR vehicle or a 4WD vehicle. Transmits engine torque to differential gear.

  In the coil for high-frequency heat treatment of the present invention, the influence of deformation and distortion associated with brazing can be suppressed to a low level. For this reason, the assembled coil can maintain high accuracy, does not require a skilled brazing technique, can be assembled in a short time, has excellent productivity, and can be reduced in cost. . Thus, since it is a high-precision coil, the gap between the heated part that greatly affects the quality of the heat treatment and the heated part can be stably maintained at a certain size, and high-quality heat treatment can be performed. .

  The induction heat treatment coil can be used for induction hardening and induction tempering, and can perform a stable induction hardening and tempering operation.

  In addition, the outer joint member for a constant velocity universal joint subjected to heat treatment using the high frequency heat treatment coil of the present invention includes a high-quality thermosetting layer, and an outer joint member excellent in strength. Become. For this reason, the constant velocity universal joint using such an outer joint member is excellent in strength, and can exhibit a stable function as a constant velocity universal joint over a long period of time. Moreover, the drive shaft and propeller shaft using such a constant velocity universal joint can exhibit a stable function.

It is a perspective view of each member of the coil for high-frequency heat processing which shows embodiment of this invention. It is sectional drawing of the drive shaft using the outer joint member for constant velocity universal joints which heat-processed using the said coil for high frequency heat processing. It is a cross-sectional view of the outer joint member for a constant velocity universal joint in a state where heat treatment is performed. It is a principal part expanded longitudinal cross-sectional view of the said outer joint member for constant velocity universal joints of the state which is heat-processing. It is a perspective view of each member of the conventional high frequency heat treatment coil. It is a perspective view which shows the assembly state of the conventional coil for high frequency heat processing. It is a cross-sectional view of a tripod type constant velocity universal joint. It is a longitudinal cross-sectional view of a tripod type constant velocity universal joint.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 2 shows a drive shaft according to the present invention, which is connected to a hollow shaft 20, a fixed constant velocity universal joint 23 connected to one end of the shaft 20, and the other end of the shaft 20. The sliding type constant velocity universal joint 24 is provided.

  The fixed type constant velocity universal joint 23 includes an outer joint member 25, an inner joint member 26, a plurality of balls 27 as torque transmitting elements, and a cage 28 that holds the balls 27 as main members. In this case, the fixed type constant velocity universal joint is exemplified by the Rzeppa type, but may be another fixed type constant velocity universal joint such as an undercut free type having a linear portion at the bottom of the track groove.

  The outer joint member 25 includes a mouth portion 31 and a shaft portion (stem portion) 32. The mouth portion 31 has a bowl shape opened at one end, and is axially formed on its spherical inner peripheral surface (inner spherical surface) 33. A plurality of extended track grooves 34 are formed at equal intervals in the circumferential direction.

  The inner joint member 26 is coupled to the shaft 20 so as to be able to transmit torque by being spline-fitted with the spline 21 at the end of the shaft 20 through the spline hole 26a in the axial center. The inner joint member 26 has a spherical outer peripheral surface (outer spherical surface) 35, and a plurality of axially extending track grooves 36 are formed at equal intervals in the circumferential direction.

  The track groove 34 of the outer joint member 25 and the track groove 36 of the inner joint member 26 form a pair, and one ball 27 is incorporated in the ball track formed by each pair of track grooves 34, 36 so that it can roll. It is. The ball 27 is interposed between the track groove 34 of the outer joint member 25 and the track groove 36 of the inner joint member 26 to transmit torque.

  The opening of the mouse part 31 is closed with a boot 40. The boot 40 includes a large diameter portion 40a, a small diameter portion 40b, and a bellows portion 40c that connects the large diameter portion 40a and the small diameter portion 40b. The large diameter portion 40 a is attached to the opening of the mouse portion 31 and fastened with a boot band 41. The small diameter portion 40 b is attached to the boot mounting portion 43 of the shaft 1 and fastened with a boot band 42.

  The sliding type constant velocity universal joint 24 is shown here as an example of a tripod type, but other sliding type constant velocity universal joints such as a double offset type can also be adopted. The constant velocity universal joint 24 includes an outer joint member 51, a trunnion 52 as an inner joint member, and a roller 53 as a torque transmission element as main components.

  The outer joint member 51 includes a mouth portion 51a and a stem portion 51b. The stem portion 51b is connected to the output shaft of the final reduction gear so that torque can be transmitted. The mouse portion 51a has a cup shape opened at one end, and a track groove 56 extending in the axial direction is formed at a position of the inner circumference in the circumferential direction. For this reason, the cross-sectional shape of the mouse | mouth part 51a exhibits a corolla shape.

  The trunnion 52 includes a boss 58 and a leg shaft 59, and is coupled to the spline 21 of the shaft 20 through a spline hole 58a of the boss 58 so that torque can be transmitted. The leg shaft 59 protrudes in the radial direction from the circumferentially divided position of the boss 58. A roller 53 is rotatably supported on each leg shaft 59.

  Again, the boot 60 is attached to close the opening of the outer joint member 51. The boot 60 includes a large-diameter portion 60a, a small-diameter portion 60b, and a bellows portion 60c between the large-diameter portion 60a and the small-diameter portion 60b. The large-diameter portion 60a is attached to the open end of the mouse portion 51a. The band 61 is tightened, and the small diameter portion 60 b is attached to the boot mounting portion 63 of the shaft 1 and is tightened with the boot band 62.

  By the way, as shown in FIG. 3, the track groove 56 of the outer joint member 51 of the sliding type constant velocity universal joint 24 is provided between the guide surface 65 facing the circumferential direction and the guide surfaces 65, 65. It consists of an inner diameter portion 66. A hardened layer S is formed near the guide surfaces of the guide surfaces 65 and 65 and the large inner diameter portion 66.

  As shown in FIG. 1, the hardened layer S is formed using a high-frequency heat treatment coil 70. The high-frequency heat treatment coil 70 includes three heating portions 71a, 71b, and 71c, and the heating portions 71a, 70b, and 70c are fitted into the track grooves 56a, 56b, and 56c, respectively.

  In this case, the high-frequency heat treatment coil 70 is assembled by molding a plurality of parts and then joining them by brazing such as silver brazing. The induction heat treatment coil 70 includes a main body portion 72 having heating portions 71a, 71b, 71c.

  Each of the heating units 71a, 71b, 71c includes a pair of vertical frames 73, 73, an upper frame 74 that connects the upper portions of the vertical frames 73, 73, and a lower frame 75 that connects the lower portions of the vertical frames 73, 73. It is what you have. The heating units 71 a, 71 b, and 71 c have upper frames 74, 74, 74 connected by an upper connecting frame 76 and lower frames 75, 75, 75 connected by a lower connecting frame 77.

  The heating parts 71a, 71b, 71c are hollow because the cooling water circulates inside them. The upper frame 74 of the heating units 71a, 71b, 71c is provided with an opening 90 that opens outward, and the lower connection frame 77 is provided with an opening (not shown) that opens downward. .

  In this manner, the main body 72 is integrally formed of the heating parts 71a, 71b, 71c, the upper frames 74, 74, 74, and the lower frames 75, 75, 75. The upper opening 90 is closed by lid members 78a, 78b, and 78c, and the lower opening is closed by lid members 79a, 79b, 79c, and 78d. The lid members 78a, 78b, and 78c have a flat plate rectangular shape. The lid members 79a and 79b include a flat plate-like first portion 80a and second portions 80b and 80b that are connected to both ends of the first portion 80a and are inclined at a predetermined angle with respect to the first portion 80a. . The lid members 79c and 79d include a first part 81a and a second part 81b, and the second part 81b faces the second part 80b of the lid members 78a and 79b.

  For this reason, this coil 70 is comprised from one main-body part 72 which has the heating parts 71a, 71b, 71c, three cover members 78a, 78b, 78c, and four cover members 79a, 79b, 79c, 78d. The That is, it is composed of eight parts.

  The main body 72 can be cut out integrally by machining from various angles using a machining center having a multi-axis control function. That is, the main body portion 72 having the heating portions 71a, 71b, 71c can be integrally cut with a publicly known shaving device.

  In this way, the molded heating parts 71a, 71b, 71c, lid members 78a, 78b, 78c and lid members 79a, 79b, 79c, 79d can be joined and assembled by brazing such as silver brazing.

  In the coil 70 assembled in this way, as shown in FIG. 3, the heating portions 71 a, 71 b, 71 c are fitted into the track grooves 66 of the outer joint member 51. At this time, in the heating units 71a, 71b, 71c, the outer surface 73a of the vertical frame 73 faces the guide surface 65 and the large inner diameter portion 66 on the guide surface 65 side with a predetermined constant gap.

  In this state, a high-frequency current is passed through the coil 70, and the heated portion is heated to an appropriate temperature above the Ac3 or Ac1 point by induction heating, then cooled (quenched) with cooling water, and further heated The part is heated to an appropriate temperature below the Ac1 point and then cooled (tempered). Thereby, the hardened layer S can be formed as shown in FIGS.

  By the way, in the said embodiment, although the coil for high frequency heat treatment forms the hardened layer S of the outer joint member 51 of the sliding constant velocity universal joint 24 of a drive shaft, it is a sliding constant velocity of a propeller shaft. You may form the hardened layer of the outer joint member in a universal joint.

  According to the high frequency heat treatment coil of the present invention, since the joining parts other than the heating parts 71a, 71b, 71c are assembled, the dimensional accuracy of the heating parts 71a, 71b, 71c by joining (for example, brazing joining) is improved. Does not cause a decline. That is, the part necessary for heating is integrally formed by machining, and the influence of deformation and distortion accompanying brazing can be suppressed to a low level, and the assembled coil can maintain high accuracy. Therefore, a skilled brazing technique is not required, and the assembly can be performed in a short time, and the productivity is excellent and the cost can be reduced. Thus, since it is a highly accurate coil, the clearance gap between the heating part and the to-be-heated part 71a, 71b, 71c which influences heat processing quality can be stably maintained to a fixed dimension, and high quality heat processing is possible. It can be performed.

  The induction heat treatment coil can be used for induction hardening and induction tempering, and can perform a stable induction hardening and tempering operation.

  Moreover, the outer joint member for a constant velocity universal joint subjected to the heat treatment using the high frequency heat treatment coil of the present invention is provided with a high-quality thermosetting layer S, and is an outer joint member excellent in strength. 51. For this reason, the constant velocity universal joint 24 using such an outer joint member 51 is excellent in strength and can exhibit a stable function as the constant velocity universal joint 24 over a long period of time. Further, a drive shaft or propeller shaft using such a constant velocity universal joint 24 can exhibit a stable function.

  As described above, the embodiment of the present invention has been described. However, the present invention is not limited to the above-described embodiment, and various modifications are possible. For example, the material of the coil for frequency heat treatment is not limited to copper, In the case of assembling a high frequency heat treatment coil, silver brazing is used in the above embodiment. However, depending on the material used, other brazing such as copper brazing, brass brazing, phosphor copper brazing is used if possible. Also good. As a tripod type constant velocity universal joint, although it was a single roller type in the said embodiment, a double roller type may be sufficient.

51 Outer joint member 65 Guide surface 66 Track groove 66 Large inner diameter portion 70 Inductive heat treatment coils 71a, 71b, 71c Heating portion

Claims (9)

  A method of manufacturing a high-frequency heat treatment coil having a heating part for heating a heat treatment part of an outer joint member for a constant velocity universal joint, wherein the heating part is formed by integral machining, A method of manufacturing a coil for high-frequency heat treatment, comprising joining and completing a portion.   A high frequency heat treatment coil having a heating portion for heating a heat treatment portion of an outer joint member for a constant velocity universal joint, wherein the heating portion is formed by integral machining. .   The coil for induction heat treatment according to claim 2, wherein the induction heating coil is used for induction hardening.   The coil for induction heat treatment according to claim 2, which is used for induction tempering.   An outer joint member for a constant velocity universal joint, which is heat-treated using the high-frequency heat treatment coil according to any one of claims 2 to 4.   The outer joint member for a constant velocity universal joint is provided with three track grooves extending in the axial direction on the inner periphery, and provided with guide surfaces facing each other on the inner side wall of each track groove, and is provided between the two guide surfaces. 6. The outer joint member for a constant velocity universal joint according to claim 5, wherein the outer joint member is for a tripod type constant velocity universal joint formed with an inner diameter portion.   The constant velocity universal joint using the outer joint member for constant velocity universal joints of the said Claim 5 or Claim 6.   A drive shaft using the constant velocity universal joint according to claim 7.   A propeller shaft using the constant velocity universal joint according to claim 7.

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