JP2009036215A - Boot fixing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a boot fixing method capable of securing high sealing performance at boot fixing portions without increasing cost. <P>SOLUTION: In the boot fixing method, the cylindrical boot fixing portions 12, 13 disposed at the end portions of a resin boot 11 are fitted to the outer peripheries of a mating member 1, and by applying fastening force to boot bands 15, 16 disposed around the outer peripheries of the boot fixing portions 12, 13, the boot fixing portions 12, 13 are fixed to the outer peripheries of the mating member 1. Coils 17 are arranged on the outer peripheries of the boot bands 15, 16, and induction currents are generated in the boot bands 15, 16 by feeding electric currents to the coils 17. Thus, reactions of magnetic fields are generated between the coils 17 and the boot bands 15, 16, and due to the reactions, the boot bands 15, 16 are plastically deformed to radially reduced states, thereby to fix the boot fixing portions 12, 13 to the outer peripheries of the mating member 1. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for fixing a resin boot attached to an automobile constant velocity universal joint or the like.

  In a constant velocity universal joint of an automobile, a cylindrical resin boot is attached for the purpose of preventing foreign matter such as dust from entering the joint and preventing leakage of grease sealed in the joint. The boot is fixed to the constant velocity universal joint by fitting the annular fixing portions at both ends of the boot to the outer ring and the inner ring shaft of the constant velocity universal joint, and using a metal boot band from the outer diameter side of these annular fixing portions. Although it is performed by tightening, in order to ensure the above-described sealing performance, it is necessary to tighten with high precision with a predetermined tightening allowance. The constant velocity universal joint requires a larger operating angle on the outboard side than the inboard side because of its function, so that grease leaks at the boot fixing point of the outer ring on the outboard side. easy.

Therefore, in fixing the boot fixing portion to the outer ring of the constant velocity universal joint, annular protrusions extending in the circumferential direction are integrally provided on the outer periphery and the inner periphery of the boot fixing portion, and the annular protrusion on the inner periphery is provided. A method has been proposed in which a boot band is tightened from the outer peripheral side of the boot fixing portion while being engaged with an annular engagement groove extending in the circumferential direction provided on the outer periphery of the outer ring (for example, Patent Document 1). According to this fixing method, since the annular convex portion on the outer periphery of the boot fixing portion is pressed to the inner peripheral side by the tightening force of the boot band, the annular convex portion on the inner periphery of the boot fixing portion causes elastic deformation, and the inner peripheral The side is displaced toward the engagement groove side of the outer ring, and the engagement is tightly engaged.
Japanese Patent Laid-Open No. 07-145863

  However, in the case of the above-described boot fixing method, since the shape of the boot fixing portion is complicated, there is a problem that the cost is increased. In addition, because there is a space limitation on the outer ring side of the constant velocity universal joint, it is easy to design with an annular protrusion on the outer periphery of the boot fixing part. When the cured product collides, there is a problem that the tightening force is reduced and the sealing performance is impaired.

  An object of the present invention is to provide a boot fixing method capable of ensuring high sealing performance at a boot fixing portion without incurring an increase in cost.

According to the boot fixing method of the present invention, a cylindrical boot fixing portion provided at an end portion of a resin boot is fitted to the outer periphery of a mating member, and a tightening force is applied to a boot band provided on the outer periphery of the boot fixing portion. In the boot fixing method for fixing the boot fixing portion to the outer periphery of the mating member, a coil is disposed on the outer periphery of the boot band, and an induced current is generated in the boot band by passing a current through the coil. The boot band is plastically deformed into a reduced diameter state by a reaction force of a magnetic field generated between the coil and the boot band, and the boot fixing portion is fixed to the outer periphery of the counterpart member.
According to this configuration, since the reaction force of the magnetic field is used, a uniform pressing force can be applied to the entire outer periphery of the boot fixing portion and the mating member, and high sealing performance at the fixing portion of the boot fixing portion can be ensured. Can do. Further, unlike the case of the conventional example, the boot fixing portion does not need to have a complicated shape, so that the cost is not increased.

In the present invention, the mating member is a shaft fitted to the inner periphery of the inner ring of the inner ring and the outer ring that are connected so as to be able to transmit rotation to each other in the constant velocity universal joint, and either one or both of the outer ring It may be.
In the constant velocity universal joint, a cylindrical resin boot is mounted for the purpose of preventing foreign matter such as dust from entering the joint and preventing leakage of grease sealed in the joint. If the above-mentioned boot fixing method is applied to fix the boot fixing portions at both ends of the boot to the outer ring and inner ring shaft of the constant velocity universal joint, the sealing performance can be ensured, so that dust can enter the joint and the inside of the joint. Leakage of grease can be prevented.

  In the present invention, the boot band may have an annular shape with a flat cross-sectional shape over the entire outer peripheral surface. In this configuration, since the boot band has a simple shape, a wide space can be secured around the outer ring with no space for fixing the boot fixing portion to the outer ring of the constant velocity universal joint.

  In the present invention, the boot band may be made of aluminum or stainless steel. In this configuration, since the boot band has a simple shape, a wide space can be secured around the outer ring with no space for fixing the boot fixing portion to the outer ring of the constant velocity universal joint.

  In the present invention, the thickness of the boot band may be 3 mm or less. When the thickness of the boot band is 3 mm or less, it is easy to obtain an effect of plastic deformation by the reaction force of the magnetic field.

The constant velocity universal joint of the present invention is a constant velocity universal joint having an inner ring and an outer ring that are connected so as to be able to transmit rotation to each other, and a shaft is fitted to the inner ring, and a resin is provided in the vicinity of the inner ring of the shaft. A boot band provided on the outer periphery of the boot fixing portion is covered with a cylindrical boot fixing portion fitted on the outer periphery of the shaft and the outer ring. The respective boot fixing portions are fastened and fixed to the outer periphery of the shaft and the outer periphery of the outer ring, and one or both of the boot fixing portions on both sides are plastically deformed into a reduced diameter state by a magnetic repulsive force. Then, it is fastened and fixed to the outer periphery of the shaft or the outer periphery of the outer ring.
According to this configuration, it is possible to ensure the sealing performance at the fixing portion of the boot fixing portion, and to prevent dust from entering the joint and leakage of grease from the inside of the bearing.

According to the boot fixing method of the present invention, a cylindrical boot fixing portion provided at an end portion of a resin boot is fitted to the outer periphery of a mating member, and a tightening force is applied to a boot band provided on the outer periphery of the boot fixing portion. In the boot fixing method for fixing the boot fixing portion to the outer periphery of the mating member, a coil is disposed on the outer periphery of the boot band, and an induced current is generated in the boot band by passing a current through the coil. Because the boot band is plastically deformed to a reduced diameter state by the reaction force of the magnetic field generated between the coil and the boot band, the boot fixing portion is fixed to the outer periphery of the counterpart member, so that the boot fixing is not caused without increasing the cost. It is possible to secure a high sealing performance at a location.
The constant velocity universal joint of the present invention is a constant velocity universal joint having an inner ring and an outer ring that are connected so as to be able to transmit rotation to each other, and a shaft is fitted to the inner ring, and a resin is provided in the vicinity of the inner ring of the shaft. A boot band provided on the outer periphery of the boot fixing portion is covered with a cylindrical boot fixing portion fitted on the outer periphery of the shaft and the outer ring. The respective boot fixing portions are fastened and fixed to the outer periphery of the shaft and the outer periphery of the outer ring, and one or both of the boot fixing portions on both sides are plastically deformed into a reduced diameter state by a magnetic repulsive force. Thus, the outer periphery of the shaft or the outer periphery of the outer ring is fastened and fixed, so that the sealing performance at the fixing portion of the boot fixing portion can be secured, and the intrusion of dust into the joint and the inside of the bearing It is possible to prevent the Luo grease leakage.

  An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an explanatory diagram in which the boot fixing method of this embodiment is applied to a constant velocity universal joint that is a mating member of a boot. 1A shows a state before the boot is fixed, and FIG. 1B shows a state where the boot is fixed. The constant velocity universal joint 1 is a fixed type, and includes an outer ring 2, an inner ring 3, an inner ring shaft 4, a ball 5 that is a rolling element for torque transmission, and a cage 6 that holds the ball 5. The outer ring 2 includes a cup part and a stem part (not shown) shown in FIG. The inner surface of the cup portion of the outer ring 2 is spherical, and a plurality (6 or 8) of track grooves 7 are formed in the spherical inner surface in the axial direction. The outer surface of the inner ring 3 is spherical, and a plurality (6 or 8) of track grooves 8 are also formed on the spherical outer surface. A plurality (6 or 8) of balls 5 are respectively incorporated between the outer ring track grooves 7 and the inner ring track grooves 8. The cage 6 is a member that holds the balls 5 in the same plane, and the balls 5 are held in pockets 6a provided at a plurality of locations in the circumferential direction. The inner ring 3 includes a central hole 9 having an uneven portion such as a serration or a spline on the inner periphery, and one end of the inner ring shaft 4 is fitted in the central hole 9 so that torque can be transmitted. The inner ring shaft 4 may be formed integrally with the inner ring 3.

A cylindrical resin boot 11 is attached to the constant velocity universal joint 1 for the purpose of preventing foreign matters such as dust from entering the joint and preventing leakage of grease sealed in the joint.
In the boot fixing method of this embodiment, cylindrical boot fixing portions 12 and 13 provided at both ends of a resin boot 11 are fitted to the outer periphery of the constant velocity universal joint 1 which is a counterpart member, The boot fixing portions 12 and 13 are fixed to the outer periphery of the constant velocity universal joint 1 by applying a tightening force to the boot bands 15 and 16 provided on the outer periphery of the boot fixing portions 12 and 13.

  As shown in FIG. 1A, the resin boot 11 is an integrated product in which cylindrical boot fixing portions 12 and 13 at both ends are connected by a bellows portion 14, and the boot fixing portion 12 at one end having a large diameter. Is fitted to the outer circumference of the outer ring 2 of the constant velocity universal joint 1, and the boot fixing portion 13 at the other end having a small diameter is fitted to the outer circumference of the inner ring shaft 4 of the constant velocity universal joint 1. Thereby, the resin boot 11 is put on the inner ring shaft 4 in the vicinity of the inner ring 3.

  Metal boot bands 15 and 16 are disposed on the outer peripheries of the boot fixing portions 12 and 13, respectively. The arrangement in this case may be a loose tightened state. The boot bands 15 and 16 have an annular shape with a flat cross-sectional shape over the entire outer peripheral surface. A metal material such as aluminum or stainless steel, which is a conductive material, is used as the material of the boot bands 15 and 16. Further, the material is made to be capable of plastic deformation by reducing the diameter. The thickness of the boot bands 15 and 16 is 3 mm or less.

  Further, a coil 17 is disposed on the outer periphery of each of the boot bands 15 and 16. By causing a steep current to flow through the coil 17, an induced current is generated in each boot band 15, 16. As a result, the reaction force of the magnetic field generated between the coil 17 and the boot bands 15 and 16 causes the boot bands 15 and 16 to be plastically deformed into a reduced diameter state as shown in FIG. Are fastened and fixed to the outer periphery of the outer ring 2 and the inner ring shaft 4.

  FIG. 2 is an explanatory view schematically showing the action of generating a reaction force of a magnetic field when a current is passed through the coil 17. At this time, reaction forces F1 and F2 are generated between the magnetic flux caused by the eddy current generated in the boot bands 15 and 16 and the magnetic flux caused by the coil current. In the figure, reference numeral Ma denotes a magnetic force line generated around the coil 17, and reference numeral Mb denotes a magnetic force line caused by an eddy current. Due to the reaction force F2 at this time, the boot bands 15 and 16 are rapidly plastically deformed into a reduced diameter state.

  In this case, by adjusting the current flowing through the coil 17, the tightening force of the boot bands 15 and 16 can be adjusted, and the coil current can be sufficiently tightened with an energization time of 1/1000 second or less. The boot bands 15 and 16 are heated by the induced current, but since the time is short, the thermal influence on the boot fixing portions 12 and 13 is small and does not cause a problem. Here, the tightening amount of the boot bands 15 and 16 was set to be 15% to 60% of the wall thickness of the boot fixing portions 12 and 13, and tightened. If the tightening amount is less than 15% of the wall thickness of the boot fixing parts 12, 13, the tightening force is weak and grease leakage occurs, and if the tightening amount is 60% or more of the wall thickness of the boot fixing parts 12, 13, This is because the boot fixing portions 12 and 13 at the tightening portion are thin and it is difficult to fix the boot.

  According to the boot fixing method of this embodiment, since the reaction force of the magnetic field is used, the boot fixing portions 12 and 13 and the outer ring 2 of the constant velocity universal joint 1 which is the counterpart member and the entire outer periphery of the inner ring shaft 4 are uniformly pushed. Pressure can be applied, and a high sealing performance at the fixing location of the boot fixing portions 12 and 13 can be ensured. Moreover, since it is not necessary to make the boot fixing | fixed part 12 and 13 into a complicated shape like the case of a prior art example, it does not cause a cost increase.

  Thus, when the above-described boot fixing method is applied to fix the boot fixing portions 12 and 13 at both ends of the boot 11 to the outer ring 2 and the inner ring shaft 4 of the constant velocity universal joint 1, Since the sealing performance at the fixed location can be secured, it is possible to reliably prevent the intrusion of dust into the joint and the leakage of grease from the inside of the joint.

  In this embodiment, the above-described boot fixing method is applied to fix the boot fixing portions 12 and 13 to the outer ring 2 and the inner ring shaft 4 of the constant velocity universal joint 1, but to the outer ring 2 located on the outboard side. The above boot fixing method may be applied only when the boot fixing portion 12 is fixed. In the constant velocity universal joint 1, the operating angle on the outboard side is particularly required to be larger than that on the inboard side. By applying the grease, it is possible to reliably prevent the grease from leaking at the boot fixing portion of the outer ring 2.

  Moreover, in this embodiment, since the boot bands 15 and 16 are made into the annular | circular shape of flat cross-sectional shape over the whole outer peripheral surface, the boot bands 15 and 16 become a simple shape. Therefore, when the boot fixing portion 12 is fixed to the outer ring 2 of the constant velocity universal joint 1, a wide space can be secured around the outer ring 2 having no space.

  Moreover, in this embodiment, since the thickness of the boot bands 15 and 16 is 3 mm or less, it is easy to obtain the action and effect of plastic deformation by the reaction force of the magnetic field.

It is explanatory drawing of one Embodiment of the boot fixing method of this invention. It is explanatory drawing which showed typically the effect | action which the reaction force of a magnetic field produces when an electric current is sent through a coil in the same boot fixing method.

Explanation of symbols

1 ... Constant velocity universal joint (mating member)
2 ... Outer ring 4 ... Inner ring shaft 11 ... Boots 12, 13 ... Boot fixing portions 15, 16 ... Boot band 17 ... Coil

Claims (6)

By fitting a cylindrical boot fixing portion provided at the end of the resin boot to the outer periphery of the mating member, and applying a tightening force to the boot band provided on the outer periphery of the boot fixing portion, the boot fixing portion In the boot fixing method of fixing the outer periphery of the mating member,
A coil is arranged on the outer periphery of the boot band, and an electric current is passed through the coil to generate an induced current in the boot band. The reaction force of the magnetic field generated between the coil and the boot band causes the boot band to be reduced in diameter. A boot fixing method characterized by deforming and fixing the boot fixing portion to the outer periphery of the mating member.   2. The shaft according to claim 1, wherein the mating member is a shaft fitted to the inner periphery of the inner ring and the outer ring of the inner ring and the outer ring that are connected to each other so as to be able to transmit rotation to each other in the constant velocity universal joint. Boot fixing method that is both.   3. The boot fixing method according to claim 1, wherein the boot band is an annular shape having a flat cross-sectional shape over the entire outer peripheral surface.   4. The boot fixing method according to claim 1, wherein the boot band is made of aluminum or stainless steel.   The boot fixing method according to any one of claims 1 to 4, wherein a thickness of the boot band is 3 mm or less. A constant velocity universal joint having an inner ring and an outer ring connected to each other so as to be able to transmit rotation to each other, and having a shaft fitted to the inner ring, and a resin boot is placed on a portion of the shaft near the inner ring. Cylindrical boot fixing portions provided at both ends of the shaft are fitted to the outer periphery of the shaft and the outer periphery of the outer ring, and the boot fixing portions are connected to the shaft by boot bands provided on the outer periphery of the boot fixing portions. The outer periphery of the shaft or the outer ring is obtained by tightening and fixing the outer periphery of the outer ring and the outer periphery of the outer ring, and plastically deforming one or both of the boot fixing portions on both sides into a reduced diameter state of the boot band by a magnetic repulsive force. A constant velocity universal joint characterized by being fastened and fixed to the outer periphery of the wire.

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