JP6612047B2 - Boot installation method - Google Patents

Description

The present invention relates to a boot mounting method for mounting a boot for a constant velocity universal joint.

  For example, constant velocity universal joints built into the power transmission mechanisms of automobiles and various industrial machines have boots (constant velocity universal) for the purpose of preventing foreign matter such as dust from entering the joints and preventing leakage of grease contained in the joints. Fitting boots are installed.

  As shown in FIG. 12, the constant velocity universal joint (fixed constant velocity universal joint) includes an outer joint member 3 having a plurality of axially extending track grooves 1 formed on the inner diameter surface 2 and a plurality of axially extending joints. Torque is provided between the inner joint member 6 in which the track grooves 4 are formed on the outer diameter surface 5 at equal intervals in the circumferential direction, and between the track groove 1 of the outer joint member 3 and the track groove 4 of the inner joint member 6. A plurality of balls 7 to be transmitted, and a cage 8 that holds the balls 7 interposed between the inner diameter surface 2 of the outer joint member 3 and the outer diameter surface 5 of the inner joint member 6 are provided.

  A female spline 9 is formed on the inner periphery of the shaft hole of the inner joint member 6, and an end male spline 11 of the shaft 10 is fitted into the shaft hole of the inner joint member 6, so that the female spline 9 and the end male spline are inserted. 11 is fitted. Further, a circumferential groove 12 is formed in the end male spline 11 of the shaft 10, and a retaining ring 13 as a stopper is attached to the circumferential groove 12.

  The opening of the outer joint member 3 is sealed with a boot 15. The boot 15 includes a large-diameter attachment portion 15a, a small-diameter attachment portion 15b, and a bellows portion 15c that connects the large-diameter attachment portion 15a and the small-diameter attachment portion 15b. A large-diameter mounting portion 15 a of the boot 15 is fastened and fixed by a fastening band 16 at the opening end of the outer joint member 3, and a small-diameter mounting portion is fastened and fixed by a fastening band 17 at a predetermined portion of the shaft 10.

  Such a fastening band includes a lever-type boot band (Patent Document 1). That is, the lever-type boot band is provided with a band main body formed on the ring portion and a lever attached to the joint portion of the band main body. The lever is folded back so that the inner surface of the lever overlaps the outer diameter surface of the band body.

  In addition, the fastening band includes a fastening band (Patent Document 2) including an engaging claw and an engaging hole. In the thing of this patent document 2, the ear | edge part which bulges to an outer-diameter side is formed, and a ring part is diameter-reduced by contracting this ear | edge part.

  However, when such a band is used, it is necessary to use the band as a separate part, which increases the number of parts and increases the manufacturing cost necessary for assembling the constant velocity universal joint. Moreover, in order to ensure the sealing performance in the band mounting state, it is necessary to tighten the band with a predetermined tightening accuracy with high accuracy, but it is difficult to cause high-precision tightening to vary among individuals. It was.

  Therefore, conventionally, high-frequency induction is used for mounting and fixing to the boot end and the mating member without using a tightening band (boot band) (Patent Document 3), and further, laser light is used ( Patent Document 4) has been proposed.

  In the case of using high frequency induction, a high frequency induction heating coil is disposed on the outer periphery of the boot member in a state where the boot end is externally fitted to the mounting surface of the mating member, and high frequency current is passed through the high frequency induction heating coil. is there. That is, the attached surface of the mating member having electrical conductivity is heated via the boot end by high frequency, and the boot end and the attached surface of the mating member are joined and integrated by the heat.

  In the case of using a laser beam, a metal material and a resin material are joined by a physical interaction generated by irradiating the laser beam from the resin material surface side.

JP 2011-252594 A Special table 2004-510113 gazette JP 2009-52688 A JP 2009-185879 A

  Compared with a conventional tightening method using a band, the one using high-frequency induction has the advantage that the number of parts can be reduced and the assembly of the constant velocity universal joint can be simplified. When using a high-frequency induction heating coil, it is preferable to adopt a separation structure in consideration of simplification of the assembly process.

  However, when the separation structure is used, a mating surface is formed on the coil. When such a mating surface is formed, there is a risk of forming a non-adhered site or a site with a weak bonding force at the joint corresponding to the mating surface.

  By the way, in fixing of a boot, the function which prevents the leak of a boot is calculated | required with the joining force which can be equal to the generation | occurrence | production of the rotational force by the differential when the expansion and contraction of a boot and a bellows contact. For this reason, let us consider a case where a non-adhesive site or the like occurs in the joint corresponding to the joint of the coil. The bonding force can be supplemented by an increase in the bonding area. On the other hand, with regard to grease leakage, when a phase that is not joined in the circumferential direction occurs, the possibility of grease leakage increases.

  In the case of using laser light, it is necessary to provide a laser irradiation device, and it is necessary to irradiate the irradiated portion with laser light over the entire circumference in the circumferential direction and the entire length in the axial direction. For this reason, it becomes complicated as an apparatus and becomes high-cost.

  Therefore, the present invention makes it possible to separate the coils, so that the sealing performance is impaired even when a portion corresponding to the mating surface is in a non-contact state in the joining in a state where a gap is generated on the mating surface to be generated. A boot mounting method that eliminates the need and a constant velocity universal joint using the method are provided.

  The boot mounting method of the present invention is a method for mounting a boot for a constant velocity universal joint in which a boot end is mounted and fixed to a metal mating member, wherein the boot end is attached to a mounted surface which is an outer diameter surface of the mating member. Is a ring body that can be divided by combining two arc-shaped bodies, and a high-frequency induction heating coil having a stepped structure on the mating surface of the arc-shaped bodies is fitted on the boot end, A high-frequency current is passed through the high-frequency induction heating coil to heat only the surface layer portion of the mounting surface of the mating member by high-frequency induction, and the mounting surface that is the inner diameter surface of the boot end and the mounting surface of the mating member Joining and integrating.

  According to the boot mounting method of the present invention, when a high-frequency current is passed through the high-frequency induction heating coil, the metal counterpart member that is a conductor due to electromagnetic induction action generates heat due to iron loss (sum of eddy current loss and hysteresis loss). With this heat, the boundary portion of the boot end in contact with the mating member is rapidly heated above the decomposition temperature and decomposed to generate bubbles. As a result, high-temperature and high-pressure conditions are generated on the surface of the melt and the mating member in the peripheral portion of the foam, and the bonding between the mounting surface of the boot end and the mating surface of the mating member is performed. Part is obtained. As a result, the boot end is attached and fixed to the metal mating member.

  By the way, as described above, if the high-frequency induction heating coil is a ring body that can be divided, a slight gap is generated between the mating surfaces, and the joining site corresponding to the mating surface is a non-joining site between the boot and the counterpart member. And there is a risk that the bonding force will be weak. Therefore, the mating surface in the high frequency induction heating coil has a stepped structure, and the non-joined part and the part with weak joining force have a so-called labyrinth structure.

  The stepped structure can be composed of a convex portion provided on the mating surface of one arcuate body and a concave portion provided on the mating surface of the other arcuate body and fitted with the convex portion.

  It is preferable that the ratio of the mounting surface (inner diameter) diameter of the boot end and the mounting surface (outer diameter) diameter of the mating member is 0.995 to 0.98. When the ratio of the diameter of the mounting surface of the boot end / attached surface of the mating member is 0.995 or more (on the side with small tightening allowance), the micro-adhesion between the metal and the boot material is insufficient, and less than 0.98 (on the side with large tightening allowance) ), The press-fit resistance of the boot is large, which may hinder assembly.

  The boot material is preferably a thermoplastic polyester elastomer. Thermoplastic polyester elastomers are excellent as mechanical strength, moldability and elasticity, and are preferable as a material having functions such as bending durability required for boots. In addition, since thermoplastic polyester elastomers are not easily heat-deformed and have a high heat-resistant temperature, if this material is applied to boots that are exposed to high temperatures such as during the operation of constant velocity universal joints, the durability of the boots will decrease due to high temperatures. Can be prevented.

A first constant velocity universal joint using the boot mounting method according to the present invention includes an outer joint member, an inner joint member, and a torque transmission member interposed between the outer joint member and the inner joint member, The opening of the outer joint member is sealed with the boot, and the boot is fitted into the inner joint member and the large-diameter mounting portion that is attached to the boot mounting portion formed on the outer diameter surface on the opening side of the outer joint member. A constant velocity universal joint comprising a small-diameter mounting portion to be attached to a boot mounting portion of a shaft to be mounted, and a bent portion connecting the large-diameter mounting portion and the small-diameter mounting portion, wherein the large-diameter mounting of the boot Using the boot mounting method as a boot mounting portion formed on the outer diameter surface on the opening side of the outer joint member as the boot end portion, and using the boot mounting method, the large diameter of the boot And the boot mounting part of the outer joint member It is those that are integrated.

A second constant velocity universal joint using the boot mounting method according to the present invention includes an outer joint member, an inner joint member, and a torque transmission member interposed between the outer joint member and the inner joint member, The opening of the outer joint member is sealed with the boot, and the boot is fitted into the inner joint member and the large-diameter mounting portion that is attached to the boot mounting portion formed on the outer diameter surface on the opening side of the outer joint member. A constant velocity universal joint comprising a small-diameter mounting portion mounted on a boot mounting portion of a shaft to be connected, and a bent portion connecting the large-diameter mounting portion and the small-diameter mounting portion, and the small-diameter mounting portion of the boot And the boot mounting portion of the shaft and the boot mounting portion of the shaft are joined and integrated using the boot mounting method with the boot mounting portion of the shaft as the mounting surface of the mating member. It is what. Is.

  In the present invention, since the joint part of the coil that may be weakly bonded or unbonded has a so-called labyrinth structure, even if a contact part or a weakly bonded part occurs, this labyrinth structure In addition, the function of preventing foreign matter such as dust from entering the inside and preventing leakage of grease sealed inside the joint can be exhibited.

  The stepped structure can be composed of a convex portion and a concave portion into which the convex portion is fitted, and the stepped structure can be formed with a simple configuration.

  If a thermoplastic polyester elastomer is used as the boot material, it is difficult to be thermally deformed and the heat-resistant temperature is high. If this material is applied to a boot that is exposed to high temperatures such as when operating a constant velocity universal joint, the durability of the boot due to the high temperature is high. Can be prevented from decreasing. In particular, the decomposition temperature of the thermoplastic polyester elastomer is about 400 ° C. to 500 ° C., and is a temperature zone that can be easily obtained by electromagnetic induction heating, and is optimal as a boot material used in this boot mounting method.

  The constant velocity universal joint using the boot mounting method exhibits excellent sealing performance over a long period of time.

It is a side view which shows the boot attachment state in the constant velocity universal joint of this invention. The relationship between a high frequency induction heating coil and one boot end part is shown, (a) is A1-A1 sectional view taken on the line of FIG. 1, (b) is B1-B1 sectional view taken on the line of FIG. The relationship between a high frequency induction heating coil and the other boot end part is shown, (a) is A2-A2 line sectional drawing of FIG. 1, (b) is B2-B2 line sectional drawing of FIG. It is a simple development view showing the stepped structure of the high frequency induction heating coil. It is sectional drawing after attaching a boot using the high frequency induction heating coil shown in the said FIG. It is explanatory drawing explaining the junction part of boots and an other party member. It is a side view of the constant velocity universal joint of the state which has attached the boot using the other high frequency induction heating coil. The relationship between a high frequency induction heating coil and one boot end is shown, (a) is a sectional view taken along line C1-C1 and E1-E1 in FIG. 6, and (b) is a sectional view taken along line D1-D1 in FIG. It is sectional drawing. The relationship between a high frequency induction heating coil and the other boot end part is shown, (a) is a sectional view taken along line C2-C2 in FIG. 6, (b) is a sectional view taken along line D2-D2 in FIG. ) Is a cross-sectional view taken along line E2-E2 of FIG. It is a simple development view showing the stepped structure of the high frequency induction heating coil. It is explanatory drawing explaining the junction part of boots and an other party member. It is sectional drawing which shows the constant velocity universal joint after attaching a boot using a boot band.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. FIG. 5 shows a constant velocity universal joint (a barfield type fixed constant velocity universal joint) according to the present invention. An outer joint member 23 in which a plurality of track grooves 21 extending in the axial direction are formed at equal intervals in the circumferential direction on the inner diameter surface 22, and a plurality of track grooves 24 extending in the axial direction are arranged at equal intervals in the circumferential direction on the outer diameter surface 25. A plurality of balls 27 as torque transmitting members that transmit torque by being interposed between the formed inner joint member 26, the track groove 21 of the outer joint member 23, and the track groove 24 of the inner joint member 26; A cage 28 is provided between the inner diameter surface 22 of the member 23 and the outer diameter surface 25 of the inner joint member 26 to hold the ball 27.

  A female spline 29 is formed on the inner periphery of the axial hole of the inner joint member 26, and an end male spline 31 of the shaft 30 is fitted into the axial hole of the inner joint member 26, so that the female spline 29 and the end male spline are inserted. 31 is fitted. Further, a circumferential groove 32 is formed in the end male spline 31 of the shaft 30, and a retaining ring 33 as a stopper is attached to the circumferential groove 32.

  The opening of the outer joint member 23 is sealed with a boot 35. The boot 35 is a bellows as a bent portion that connects the large-diameter attachment portion (boot end portion) 35a, the small-diameter attachment portion (boot end portion) 35b, and the large-diameter attachment portion 35a and the small-diameter attachment portion 35b. Part 35c. The boot material is formed of a resin material mainly composed of a thermoplastic elastomer such as polyester, polyurethane, polyolefin, polyamide, polystyrene, vinyl chloride, silicone, or fluorine. In this embodiment, among these, it is formed of a resin material mainly composed of a polyester-based thermoplastic elastomer (thermoplastic polyester elastomer) exhibiting excellent properties such as mechanical strength, heat resistance, and oil resistance with respect to cost. .

  A large-diameter attachment portion (one boot end portion) 35a of the boot 35 is attached and fixed to an attachment surface (attachment surface of a metal mating member) 40 on the outer diameter surface on the opening side of the outer joint member 23. The mounting portion (the other boot end portion) 35b is fixedly attached to an outer diameter surface (surface to be attached of a metal mating member) 41 of the large diameter portion of the shaft 30.

  As shown in FIGS. 1 to 4, high-frequency induction heating coils 50 (50A, 50B) are used for these mounting and fixing. These high frequency induction heating coils 50A and 50B are split ring bodies formed by combining a pair of arcuate bodies 60A, 60A, 60B and 60B. The inner diameter surfaces 50Aa and 50Ba and the outer diameter surfaces 50Ab and 50Bb are cylindrical surfaces as shown in FIGS. For this reason, as shown in FIG. 5, the outer diameter surfaces 45A and 45B of the boot end portions 35a and 35b are formed on the cylindrical surface.

  Further, the arcuate bodies 60A and 60A (60B and 60B) have a ring shape by abutting their joint surfaces. In this case, the mating surfaces of the arcuate bodies 60A and 60A (60B and 60B) are stepped. Structure M is assumed. That is, both end surfaces of each arcuate body 60A, 60A (60B, 60B) are abutting surfaces, and as shown in FIG. 4, a convex portion 66 and a concave portion 67 are formed on either one of the facing (abutting) abutting surfaces. On the other side, a concave portion 68 and a convex portion 69 that fit into the convex portion 66 are formed, and a stepped structure M is formed. Further, the step D of the stepped structure M is, for example, about 3.0 mm to 4.0 mm.

  These high-frequency induction heating coils 50A and 50B are made of conductive copper wire or the like, and may be solid or hollow. If it is a hollow body, cooling water can be passed inside. If it is solid, it is preferable to provide a cooling jacket separately from the high-frequency induction heating coils 50A and 50B.

  Next, a boot mounting method using the high frequency induction heating coil 50 (50A, 50B) shown in FIGS. 1 to 4 will be described. First, the outer joint member 23 side will be described. In this case, one boot end 35a (see FIG. 5) is externally fitted to the attached surface 40 (see FIG. 5) which is the boot mounting portion of the outer joint member 23. Next, the pair of arcuate bodies 60A and 60A are brought into a state of externally fitting the high frequency induction heating coil 50A to the boot end portion 35a by abutting the butted surfaces from the outer diameter side of the boot end portion 35a.

  Further, on the shaft 30 side, the other boot end 35b (see FIG. 5) is externally fitted to the attached surface 41 (see FIG. 5) which is the boot mounting portion of the shaft 30. The pair of arcuate bodies 60B, 60B are brought into a state of externally fitting the high frequency induction heating coil 50B to the boot end portion 35b by abutting the butted surfaces from the outer diameter side of the boot end portion 35b.

  Thus, the high frequency induction heating coil 50 (50A, 50B) flows the high frequency current of the coils 50A, 50B in the set state, as shown in FIG. At this time, the metal that is a conductor (the mounting surface 40 of the outer joint member 23 and the mounting surface 41 of the shaft 30) generates heat due to iron loss (the sum of eddy current loss and hysteresis loss) due to electromagnetic induction. Resin (mounting surface 53A of one boot end 35a and mounting surface 53B of the other boot end 35b) in contact with metal (the mounted surface 40 of the outer joint member 23 and the mounted surface 41 of the shaft 30) due to heat ) Is rapidly heated above the decomposition temperature and decomposed to generate bubbles. As a result, high-temperature and high-pressure conditions are generated on the surfaces of the high-temperature melt and the metal (the attachment surface 40 of the outer joint member 23 and the attachment surface 41 of the shaft 30) in the peripheral portion of the bubble, as shown in FIG. As shown in FIG. 3, the mounting surface 53A of the one end 35a of the boot 35 and the mounting surface 40 of the outer joint member 23 and the mounting surface 53B of the other end 35b of the boot 35 and the mounting surface of the shaft 30 Junction portions 55 and 56 (see FIG. 5) are obtained with 41.

  In the stepped structure M of the high frequency induction heating coil 50A (50B), as shown in FIG. 4, a pair of axial seams 70A1, 70A2 (70B1, 70B2) and the seams 70A1, 70A2 (70B1, 70B2) ), A circumferential seam 71A (71B) is formed. In this case, the pair of seams 70A1, 70A2 (70B1, 70B2) are out of phase, that is, in the circumferential direction.

  By the way, if the high frequency induction heating coils 50A and 50B are separable types as described above, when the coils 50A and 50B are attached to the boot end portions 35a and 35b as shown in FIG. , 70A2, and 71A (70B1, 70B2, and 71B), there is a possibility that a gap is generated. Thus, when a clearance gap arises, as shown in FIG. 6, the site | part corresponding to a clearance gap becomes weak junction S1 between a boot edge part and the other party member. In addition, the site | part which does not respond | correspond to a clearance gap becomes the strong junction part S. FIG. FIG. 6 shows the fixing portion between the boot end portion 35b and the shaft 30. Even in the fixing portion between the boot end portion 35a and the outer joint member 23, there is a gap at the joints 70A1, 70A2, 71A. If this occurs, such a weak joint S1 and a strong joint S are formed.

  However, even if the weak joint S1 and the strong joint S are formed, the weak joint S1 has a stepped shape and a so-called labyrinth structure. For this reason, it is possible to exhibit a sealing function that can exhibit the function of preventing foreign matter such as dust from entering the inside and the function of preventing leakage of grease sealed inside the joint.

  Next, as shown in FIG. 10, a pair of convex portions 66 are provided on the abutting surfaces of the arcuate bodies 60A and 60A (60B and 60B) in the high-frequency induction heating coils 50A and 50B shown in FIGS. 66 and a concave portion 67 provided between the convex portions 66, 66, and a pair of concave portions 68, 68 fitted to the convex portions 66, 66 and a convex portion 69 fitted to the concave portion 67 are provided on the other side. It has been. When the width dimension of the convex portion 66 is W1 and the width dimension of the concave portion 67 is W2, W2> W1 is set. Further, the step D of the stepped structure M is also set to about 3.0 mm to 4.0 mm.

  Therefore, even if these high-frequency induction heating coils 50A and 50B are attached to the boot end portions 35a and 35b and a high-frequency current is passed, the mounting surface 53A of the one end portion 35a of the boot 35 and the outer joint Joint portions 55 and 56 (see FIG. 5) are obtained between the mounting surface 40 of the member 23 and between the mounting surface 53B of the other end 35b of the boot 35 and the mounting surface 41 of the shaft 30. .

  In the stepped structure M of the high-frequency induction heating coil 50A (50B), a pair of axial seams 70A1, 70A2 (70B1, 70B2) and the seams 70A1, 70A2 (70B1, 70B2) are continuously provided. Circumferential seams 71A1, 71A2 (71B1, 71B2) and axial seams 72A (72B) connecting the seams 71A1, 71A2 (71B1, 71B2) are formed. In this case, the joints 70A1, 70A2 (70B1, 70B2) and the joint 72A (72B) are out of phase, that is, shifted in the circumferential direction.

  Even in this case, there is a possibility that a gap is generated at the joints 70A1, 70A2, 71A1, 71A2, and 72A (70B1, 70B2, 71B1, 71B2, and 72B). Thus, when a clearance gap arises, as shown in FIG. 11, the site | part corresponding to a clearance gap becomes weak junction S1 between a boot edge part and the other party member. In addition, the site | part which does not respond | correspond to a clearance gap becomes the strong junction part S. FIG. FIG. 11 describes the fixing portion between the boot end portion 35b and the shaft 30, but the joints 70A1, 70A2, 71A1, and 71A2 are used even in the fixing portion between the boot end portion 35a and the outer joint member 23. , 72A, a weak joint S1 and a strong joint S are formed.

  However, in this case as well, the weak joint S1 has a stepped shape and a so-called labyrinth structure. For this reason, it is possible to exhibit a sealing function that can exhibit the function of preventing foreign matter such as dust from entering the inside and the function of preventing leakage of grease sealed inside the joint. The constant velocity universal joint using the boot mounting method exhibits excellent sealing performance over a long period of time.

  By the way, in each said embodiment, the diameter ratio of the attachment surfaces 53A and 53B of the boot end parts 35a and 35b and the to-be-attached surfaces 40 and 41 of the other member (the outer joint member 23, the shaft 30) is 0.995-0. It is preferable to set a 98 allowance. If the tightening allowance is 0.995 or more, the micro-adhesion between the metal and the boot material is insufficient, and if the tightening allowance is greater than 0.98, the press-fit resistance of the boot is large, which may hinder assembly.

  The boot material is preferably a thermoplastic polyester elastomer. Thermoplastic polyester elastomers are excellent as mechanical strength, moldability and elasticity, and are preferable as a material having functions such as bending durability required for boots. In addition, since thermoplastic polyester elastomers are not easily heat-deformed and have a high heat-resistant temperature, if this material is applied to boots that are exposed to high temperatures such as during the operation of constant velocity universal joints, the durability of the boots will decrease due to high temperatures. Can be prevented.

  In addition, the decomposition temperature of the thermoplastic polyester elastomer is about 400 ° C. to 500 ° C., which is a temperature range that can be easily obtained by electromagnetic induction heating, and there is an advantage that the fixing of the boot end by electromagnetic induction heating is stabilized.

  As described above, the embodiment of the present invention has been described. However, the present invention is not limited to the above embodiment, and various modifications are possible. In the above embodiment, the outer joint member 23 side and the shaft 30 side are also Although high-frequency induction heating is used without using a boot band, either one may be attached and fixed by an existing method using a boot band.

  The boot end portions 35a and 35b and the high-frequency induction heating coils 50A and 50B may or may not be in contact with each other, but the gap between the object to be heated (the counterpart member) and the coil is circumferential. Since it is preferable to be uniform over the entire circumference, it is preferable to make contact.

  As a process of attaching the boot end portions 35a and 35b, even if both the boot end portions 35a and 35b are performed at the same time, either one is performed first, and after this step is completed, the other step is performed. There may be.

  Fixed constant velocity universal joints are not limited to those shown in the illustrations, but even undercut-free type fixed constant velocity universal joints, double offset type, cross groove type, tripod type sliding constant velocity universal joints It may be.

A grease leak test was performed on a device in which the boot end and the shaft were fixedly attached using coils having different shapes of mating surfaces. The results are shown in Table 1 below. In this test, a fixed type constant velocity universal joint as shown in FIG. 5 was used, the swing angle was 25 deg to 40 deg, and the rotation speed was 500 rpm.

  From this result, leakage occurs in 50 hours on a straight mating surface that is not a stepped structure, and in labyrinth 1 (stepped structure shown in FIG. 1), no leakage occurs after 70 hours of operation, and labyrinth 2 (FIG. 7). In the stepped structure shown in Fig. 4, no leakage occurred after 85 hours of operation.

23 Outer joint member 26 Inner joint member 27 Torque transmission member (ball)
35 Boot 35a, 35b Boot end (mounting part)
40, 41 Mounted surface 50, 50A, 50B High frequency induction heating coil 53A, 53B Mounting surface 60A, 60A Arc-shaped body 65, 65 Matching surface 66, 69 Convex portion 67, 68 Concave portion M Stepped structure

Claims (4)

A method for attaching a boot for a constant velocity universal joint in which a boot end is attached and fixed to a metal counterpart member,
After the boot end is fitted on the mounting surface, which is the outer diameter surface of the mating member, it is a splittable ring body that is a combination of two arcuate bodies, and the mating surface of the arcuate body is a stepped structure The high-frequency induction heating coil is externally fitted to the boot end, and a high-frequency current is passed through the high-frequency induction heating coil to heat only the surface layer portion of the mounting surface of the mating member by high-frequency induction. A boot mounting method, wherein a mounting surface which is a surface and a mounting surface of the mating member are joined and integrated.   The stepped structure includes a convex portion provided on a mating surface of one arcuate body and a concave portion provided on the mating surface of the other arcuate body and fitted with the convex portion. The boot mounting method according to claim 1.   The ratio of the inner diameter of the mounting surface of the boot end portion to the outer diameter of the mounting surface of the mating member is set to 0.995 to 0.98 as a tightening allowance. The boot mounting method described.   The boot attachment method according to any one of claims 1 to 3, wherein the boot material is a thermoplastic polyester elastomer.

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