JP4875556B2 - Boot mounting method for ball joint and boot mounting apparatus - Google Patents

Description

  The present invention provides a large-diameter bead at the outer periphery of an end of a ball housing of the ball joint when a boot having a large-diameter bead at one end and a smaller-diameter bead at the other end is attached to the ball joint. The present invention relates to a boot mounting method for a ball joint and a boot mounting device for mounting the large-diameter bead in a groove.

Conventionally, as disclosed in Patent Document 1 below, as a method of attaching a boot to such a ball joint, a large-diameter bead of the boot is pressed against the end surface of the ball housing, and high-pressure air is supplied into the boot. It is already known that a large-diameter bead is mounted in a large-diameter bead groove on the outer periphery of the end of the ball housing while expanding and expanding the diameter.
Japanese Examined Patent Publication No. 62-20420

  In the conventional method for mounting a boot on a ball joint as described in Patent Document 1, when high-pressure air is supplied into the boot, it is preliminarily applied to the end of the ball joint or the like by high-pressure air that leaks slightly from the boot. The applied grease may be scattered outside.

  The present invention has been made in view of such circumstances, and a ball capable of easily and reliably mounting the large-diameter bead of the boot in the large-diameter bead groove on the outer periphery of the end portion of the ball housing without causing external scattering of grease. It is an object of the present invention to provide a boot mounting method and a boot mounting apparatus for a joint.

  In order to achieve the above object, the present invention provides a ball housing for a ball joint when a boot having a large-diameter bead at one end and a small-diameter bead at the other end is attached to the ball joint. In the boot mounting method to the ball joint, in which the large-diameter bead is mounted in the large-diameter bead groove on the outer periphery of the end portion of the ball, the first step of inverting the boot so that the front and back are reversed, and the first step The first feature is to execute the second step of fitting the large-diameter bead into the large-diameter bead groove while re-inverting the inverted reversal boot toward the original shape.

  Further, the present invention is a boot mounting device for a ball joint for executing the boot mounting method for the ball joint of the first feature, comprising a boot reversing device used for executing the first step. The reversing device moves up and down between a hollow boot cradle on which the large-diameter bead of the boot is placed, an ascending position spaced upward from the boot cradle, and a descending position where the lower end portion enters the hollow portion of the boot cradle. The lift shaft is fitted to the lift shaft at the lowered position while generating frictional resistance on the inner peripheral surface of the small-diameter bead on the boot cradle so that the small-diameter bead is hollow in the boot cradle. A second feature is that a friction fitting shaft portion is provided to be pulled into the portion.

  Furthermore, in the present invention, in addition to the second feature, the boot receiving base is constituted by a plurality of boot receiving arms arranged in an annular shape, and an upper end of the boot receiving arm group on which the large-diameter beads of the boot are placed. A third feature is that the portion can be expanded and contracted in the radial direction.

  Furthermore, the present invention is a boot mounting device to a ball joint for executing the boot mounting method to the ball joint of the first feature, comprising a boot re-inversion device used for executing the second step, In this boot re-inversion device, a ball joint is disposed so as to be able to abut on a joint mounting table for placing one end of the ball joint facing upward and a ball stud upper end surface of the ball joint mounted on the joint mounting table. The lifting / lowering shaft and an ironing arm that is slidably attached to the lifting / lowering shaft. When the lifting / lowering shaft is brought into contact with the upper end surface of the ball stud, Lower and place the small-diameter bead of the reversing boot attached to the friction fitting shaft of the lifting shaft against the top surface of the ball stud, and squeeze the outer periphery of the large-diameter bead of the reversing boot. More, the fourth feature to be configured large diameter beads was re-invert the inverted boots original to mount the large-diameter bead groove ball housing.

  Furthermore, in addition to the fourth feature of the present invention, a plurality of the squeezing arms are pivotally supported so as to be able to swing in the radial direction on a support that moves up and down separately from the elevating shaft. A fifth feature is that the formed ironing surface is expanded radially outward in accordance with the progress of ironing with respect to the reversing boot.

  According to the first feature of the present invention, a large-diameter bead can be easily and surely installed in a large-diameter bead groove without using high-pressure air, and therefore before the mounting, around the end of the ball stud. Even when grease is applied, the grease can be securely held in the boot.

  According to the second feature of the present invention, the boot can be automatically reversed by pulling the small-diameter bead into the hollow portion simply by lowering the lifting shaft.

  According to the third feature of the present invention, when the lifting shaft to which the small-diameter bead of the reversing boot is attached is taken out above the boot cradle, the upper end portion is radially expanded so that the boot cradle is The reversing boot can be removed without interference. Therefore, it is possible to prevent the reversing boot from touching the boot cradle and re-reversing to the original shape when taking it out.

  According to the fourth feature of the present invention, the large diameter bead can be automatically mounted in the large diameter bead groove of the ball housing while the reversing boot is re-inverted to the original shape by simply lowering the ironing arm.

  According to the fifth aspect of the present invention, when the reversing boot is re-reversed, the ironing surface can follow the large-diameter bead to slightly expand and re-invert the reversing boot. .

  Embodiments of the present invention will be described below on the basis of preferred embodiments of the present invention shown in the accompanying drawings.

  FIG. 1 is a longitudinal sectional view showing an example of a ball joint to which the present invention is applied, FIG. 2 is a longitudinal sectional view of a boot reversing device used for executing the first step of the method of the present invention, and FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. 3, FIG. 5 is a cross-sectional view taken along line 5-5 of FIG. 3, FIG. 6 is an explanatory diagram of inversion start of the boot by the boot inversion device, and FIG. FIG. 8 is an explanatory diagram of the start of lifting of the reversing boot, FIG. 9 is a longitudinal sectional view of a boot re-reversing device used for executing the second step of the method of the present invention, and FIG. 10 is a sectional view taken along the line 10-10 in FIG. FIG. 11 is an enlarged view of a portion 11 in FIG. 9, FIG. 12 is an explanatory diagram showing the start of re-inversion of the inversion boot by the boot re-inversion device, and FIG.

  First, the structure of the ball joint J and the boot B attached to the ball joint J will be described with reference to FIG.

  The ball joint J is mainly composed of a ball housing 1 and a ball stud 2 supported by the ball housing 1 so as to be swingable in all directions. The ball housing 1 has a spherical concave surface 4 that supports the spherical head 2a of the ball stud 2 via a synthetic resin bearing bush 3. To form the spherical concave surface 4, the ball housing 1 A first housing half 1a that supports one hemisphere of the head 2a, and a second housing half that fits into the first housing half 1a and is caulked to support the other hemisphere of the head 2a. 1b. Large diameter bead grooves 6 are formed on the outer peripheral surfaces of the outer end portions of the first and second housing halves 1a and 1b.

  The ball stud 2 has a pair of shaft portions 2b projecting outward from the ball housing 1 from both ends of a spherical ball head 2a, and the outer peripheral surface of each shaft portion 2b is formed from the base end side, that is, the ball head. An annular grease reservoir 8 and an annular small-diameter bead groove 7 smaller in diameter than the large-diameter bead groove 6 are formed from the side of the portion 2 a, and the small-diameter bead groove 7 is disposed outside the ball housing 1. Further, the ball stud 2 is provided with a shaft hole 2c that passes through the ball stud 2 along its axis. Grease 40 is stored in the grease reservoir 8.

  Boots B are respectively attached to both ends of the ball joint J using the large-diameter bead groove 6 and the small-diameter bead groove 7.

  Each boot B is integrally formed from an elastic material such as rubber, and has a body portion 10 having excellent flexibility, a large-diameter bead 11 connected to one end of the body portion 10, and a body portion 10. A small-diameter bead 12 that is smaller in diameter than the large-diameter bead 11 is provided continuously to the other end, and a ring groove 11 a is formed on the outer periphery of the large-diameter bead 11. Thus, at each end of the ball joint J, the large-diameter bead 11 of the boot B and the small-diameter bead 12 are elastically mounted in the large-diameter bead groove 6 and the small-diameter bead groove 7, respectively. A set ring 13 for tightening the large-diameter bead 11 is mounted in the ring groove 11a. Thus, the boots B attached to both ends of the ball joint J allow the ball stud 2 to swing by the elastic deformation of the body portion 10, and can protect the ball housing 1 from dust and water.

  Now, a method and apparatus for mounting the boot B will be described.

  The boot B is mounted in the first step of reversing the boot B so that the front and back are reversed, and the large-diameter bead 11 is balled while reversing the reversal boot B ′ reversed in the first step to the original shape. And a second step of mounting in the large-diameter bead groove 6 of the housing 1.

  The boot reversing device 15 used for execution of the first step will be described with reference to FIGS.

    2 to 5, the base 16 of the boot reversing device 15 has a hollow portion 17 penetrating through the center portion thereof, and a plurality of upwardly extending support columns 18 stands on the periphery of the upper opening of the hollow portion 17. A plurality of boot receiving arms 19 extending in the vertical direction are disposed between the support posts 18, and an intermediate portion of each boot receiving arm 19 is rotatable on the support posts 18 on both sides by a pivot 20. Supported. Thus, the plurality of boot receiving arms 19 are arranged in an annular shape.

  A hollow regulating cylinder 21 is attached to the upper ends of the plurality of columns 18 so that they are connected to each other, and each boot receiving arm 19 abuts against and is separated from the outer peripheral surface of the regulating cylinder 21. In this way, it swings around the pivot axis 20. The upper ends of the annularly arranged boot receiving arms 19 extend to the upper side of the restricting cylinder 21, and the annular contraction springs 22 are attached to the upper ends of the upper ends, so that the boot receiving arms 19 are separated from the restricting cylindrical bodies. It is urged in the contact direction with the outer peripheral surface of 21.

  An inward projection 19a is formed at each upper end portion of the boot receiving arm 19 group, and an annular positioning recess 23 for placing and positioning the large-diameter bead 11 of the boot B on the upper end surface of the inward projection 19a. Is formed. Thus, the boot receiving arm 19 group constitutes a hollow boot receiving base 24 on which the boot B is placed in a regular free state.

  Also, an arm control member 25 that can be moved up and down so as to advance and retreat with respect to the lower end of the boot receiving arm 19 group is disposed in the base 16. The arm control member 25 is provided with a funnel-shaped cam surface 25a on the upper surface. When the arm control member 25 is lifted, the lower end portion of the boot receiving arm 19 group is moved radially inward to the cam surface 25a. The upper end of each is opened greatly outward in the radial direction (see the chain line state in FIG. 5 and FIG. 8).

  An elevating shaft 26 is disposed coaxially with the hollow boot cradle 24, and this elevating shaft 26 enters the hollow portion 17 of the boot pedestal 24 at the raised position spaced apart from the boot cradle 24 and at the lower end. It moves up and down between the lowered positions. The elevating shaft 26 protrudes from a cylindrical friction fitting shaft portion 26a that can be fitted while generating frictional resistance on the inner peripheral surface of the small-diameter bead 12 of the boot B, and a lower end surface of the friction fitting shaft portion 26a. The guide shaft portion 26b has a diameter sufficiently smaller than that of the small-diameter bead 12, and the guide shaft portion 26b can be fitted into the shaft hole 2c of the ball stud 2. The regulating cylinder 21 has a bottom wall 21a that receives the lower end surface of the friction fitting shaft portion 26a so as to regulate the lowered position of the elevating shaft 26.

  The operation of the boot reversing device 15 will be described. First, as shown in FIG. 3, each boot receiving arm 19 is brought into contact with the outer peripheral surface of the regulating cylindrical body 21, and the upper end surface of the group of boot receiving arms 19 is set. An annular positioning recess 23 is formed on the large diameter bead 11 of the boot B on the positioning recess 23. Next, as shown in FIG. 6, the elevating shaft 26 that has been waiting upward is lowered, and the friction fitting shaft portion 26a is generated on the inner peripheral surface of the small-diameter bead 12 while generating friction resistance therebetween. Mating. As a result, the small-diameter bead 12 is pulled downward by the descending friction fitting shaft portion 26a and passes through the inside of the large-diameter bead 11 supported by the positioning recess 23, so that the front and back of the boot B are reversed. First, as shown in FIG. 7, the large-diameter bead 11 is detached from the positioning recess 23 downward.

  Thereafter, the arm control member 25 is raised and the lower end portions of the boot receiving arm 19 group are simultaneously moved radially inward by the funnel-shaped cam surface 25a, so that the upper end portion of the boot receiving arm 19, that is, the positioning concave portion is obtained. Open 23 wide. Therefore, as shown in FIG. 8, when the elevating shaft 26 is raised, the reversing boot B 'attached to the friction fitting shaft portion 26a by the frictional force with the small-diameter bead 12 is attached to each upper end of the boot receiving arm 19 group. It can be taken out without any interference with the inward projection 19a. The operation so far corresponds to the first step. The elevating shaft 26 to which the reversing boot B ′ is attached is moved to the second step.

  Next, the boot re-inversion device 30 used for the execution of the second step will be described with reference to FIGS.

  The elevating shaft 26 also serves as a component of the re-inversion device 30. That is, as shown in FIGS. 9 and 10, the elevating shaft 26 is supported by the movable support 31 so as to be movable up and down. The movable support 31 can move the elevating shaft 26 to which the reversing boot B ′ is attached to a coaxial position above the joint mounting table 32 on which the ball joint J is mounted. The elevating shaft 26 and the movable support 31 are individually raised and lowered by an elevating drive source (not shown).

  The elevating shaft 26 includes a tapered shaft portion 26c that is continuous with the upper end of the friction fitting shaft portion 26a and expands upward, and a large-diameter shaft portion 26d that is continuous with the upper end of the tapered shaft portion 26c. The large-diameter shaft portion 26d is supported by the movable support body 31 so as to be movable up and down.

  On the other hand, a plurality of support arms 33 surrounding the lifting shaft 26 are formed on the movable support 31, and a plurality of squeezing arms 34 arranged in an annular shape so as to surround the lifting shaft 26 are formed on these support arms 33. Attached so as to be swingable in the radial direction via a pivot 35. A semi-cylindrical guide protrusion 34a that can slide smoothly on the outer peripheral surface of the lifting shaft 26 is integrally formed at the upper end of each ironing arm 34. The guide protrusion 34a is always in contact with the outer peripheral surface of the lifting shaft 26. For this purpose, an annular contraction spring 36 is mounted on the outer periphery of the upper end of the ironing arm 34 group. The inner surface of the lower end is formed on an arcuate ironing surface 34b that can be brought into frictional contact with the outer peripheral surface of the inverted boot B on the friction fitting shaft portion 26a.

  On the other hand, the joint mounting table 32 includes a positioning recess 37 into which one end of the ball housing 1 is fitted and a positioning shaft 38 to be fitted into the shaft hole 2c of the ball stud 2 in order to hold the ball joint J in place. Prepare.

  The operation of the re-inversion device 30 will be described. First, as shown in FIG. 9, the ball joint J is placed at a fixed position on the joint mounting table 32, and the inversion boot is formed at the coaxial position directly above it at the first step. A lifting shaft 26 to which B 'is attached is disposed. Then, as shown in FIG. 11, the grease 40 is applied to the grease reservoir 8 and the small-diameter bead groove 7 of the ball stud 2 using the grease nozzle 39.

  Thereafter, as shown in FIG. 12, the elevating shaft 26 is lowered so that the guide shaft portion 26b is fitted into the shaft hole 2c of the ball stud 2, and the lower end of the friction fitting shaft portion 26a is connected to the upper end surface of the ball stud 2. Abut. Next, when the moving support 31 is lowered, the ironing arms 34 group supported by the moving support 31 first of the large-diameter bead 11 of the reversing boot B ′ attached to the friction fitting shaft portion 26a by the ironing surface 34b. By pressing the outer peripheral edge, the entire reverse boot B ′ is pushed down, and the small-diameter bead 12 is brought into contact with the upper end surface of the ball stud 2.

  As the moving support 31 is further lowered, the guide projection 34a of the ironing arm 34 descends to the outer peripheral surfaces of the tapered shaft portion 26c and the friction fitting shaft portion 26a by the urging force of the contraction spring 36. As the squeezing surface 34b of the squeezing arm 34 group gradually expands the diameter, the outer peripheral surface of the large-diameter bead 11 of the reversing boot B 'is squeezed downward, so that the reversing boot B' is re-reversed. At this time, the diameter of the ironing surface 34b of the ironing arm 34 group gradually increases, and when the ironing surface 34b re-inverts the reversing boot B ', the large-diameter bead 11 expands and deforms. This will promote the re-inversion of B '. When the large-diameter bead 11 moves downward beyond the small-diameter bead 12 supported by the upper end surface of the ball stud 2 by this re-inversion, the large-diameter bead 11 waits downward as shown in FIG. The ball housing 1 is naturally fitted into the large-diameter bead groove 6. This action corresponds to the second step.

  Thereafter, the movable support 31 and the elevating shaft 26 are raised, and then the set ring 13 is mounted in the ring groove 11 a on the outer periphery of the large-diameter bead 11. Finally, the small-diameter bead 12 is mounted in the small-diameter bead groove 7 manually or using a known expansion device. Further, the boot B is attached to the opposite end of the ball joint J in the same manner as described above.

  As described above, when mounting the large-diameter bead 11 in the large-diameter bead groove 6 on the outer periphery of the end of the ball housing 1 of the ball joint J, the first step of reversing the boot B so that the front and back thereof are reversed is performed. The small-diameter bead 12 of the reversing boot B ′ reversed in the first step is received by the end face of the ball stud 2 and the reversing boot B ′ is re-inverted toward the original shape, and at the same time, the large-diameter bead 11 is Since the second step of fitting into the bead groove 6 is executed, the large-diameter bead 11 can be easily and reliably mounted in the large-diameter bead groove 6 without using high-pressure air. Even when the grease 40 is applied around the end of the stud 2, the grease 40 can be reliably held in the boot B.

  The boot reversing device 15 used for the execution of the first step includes a hollow boot receiving base 24 on which the large-diameter bead 11 of the boot B is placed, a rising position spaced upward from the boot receiving base 24, and a lower end portion. And an elevating shaft 26 that ascends and descends between lowering positions for entering the hollow portion 17 of the boot cradle 24. The elevating shaft 26 is located in the small diameter bead 12 of the boot B on the boot cradle 24 at the lowered position. A friction fitting shaft portion 26a for pulling the small-diameter bead 12 into the hollow portion 17 is provided while frictional resistance is generated on the peripheral surface. Therefore, if the elevating shaft 26 is lowered, the small-diameter bead 12 is provided. Can be pulled into the hollow portion 17 to automatically reverse the boot B.

  Further, the boot receiving base 24 includes a plurality of boot receiving arms 19 arranged in an annular shape, and an upper end portion of the boot receiving arm 19 group, in which a positioning recess 23 for placing the large-diameter bead 11 of the boot B is formed. Since it is possible to expand and contract in the radial direction, when the lifting shaft 26 to which the reverse boot B ′ is attached is taken out above the boot cradle 24, the upper end portion is radially expanded so that the reverse boot B ′ is It can be taken out without being interfered by the boot cradle 24. Therefore, it is possible to avoid the reversal boot B 'touching the boot cradle 24 and re-reversing to the original shape during the removal.

  Furthermore, the boot re-inversion apparatus 30 used for the execution of the second step is mounted on the joint mounting table 32 for mounting the ball joint J with one end thereof facing upward, and the joint mounting table 32. The elevating shaft 26 is disposed so as to be able to contact the upper end surface of the ball stud 2 of the ball joint J, and the squeezing arm 34 is slidably attached to the elevating shaft 26. When the ball 26 is brought into contact with the upper end surface of the ball stud 2, the small diameter bead 12 of the reversal boot B ′ that descends with respect to the lifting shaft 26 and adheres to the friction fitting shaft portion 26 a of the lifting shaft 26 is inserted into the ball stud 2. By contacting the outer peripheral surface of the large-diameter bead 11 of the reversing boot B ′ in contact with the upper end surface, the reversing boot B ′ is re-inverted to the original shape, and the large-diameter bead 11 is Since it is mounted in the bead groove 6, if the squeezing arm 34 is lowered, the reversing boot B ′ is re-inverted to the original shape, and at the same time, the large-diameter bead 11 is automatically made into the large-diameter bead groove 6 of the ball housing 1. Can be installed.

  Furthermore, a plurality of squeezing arms 34 are pivotally supported on a movable support 31 that moves up and down separately from the elevating shaft 26, and a squeezing surface 34 b formed at the lower end of the squeezing arms 34 includes: Since the reversing boot B 'expands radially outward as the ironing progresses with respect to the outer peripheral surface of the large-diameter bead 11, the rubbing surface 34b becomes large when the reversing boot B' is re-inverted. The re-inversion of the inversion boot B ′ can be promoted by following the slight expansion of the diameter of 11.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the scope of the present invention. For example, in the above embodiment, when moving from the first process to the second process, the movable support 31 is moved and the elevating shaft 26 is disposed immediately above the joint mounting table 32, but the position of the elevating shaft 26 is not changed. The joint mounting table 32 can also be arranged directly below the lifting shaft 26 by moving the base 16. The present invention can also be applied to the mounting of a boot on a ball joint in which the ball stud has only a single shaft portion.

The longitudinal cross-sectional view which shows an example of the ball joint to which this invention is applied. The longitudinal cross-sectional view of the boot inversion apparatus used for execution of the 1st process of this invention method. FIG. 3 is an enlarged view of part 2 of FIG. 2. FIG. 4 is a sectional view taken along line 4-4 of FIG. FIG. 5 is a sectional view taken along line 5-5 of FIG. The inversion start explanatory drawing of the boot by a boot inversion device. The reverse end explanatory drawing of the boot. Explanatory drawing of pulling up start of inversion boots. The longitudinal cross-sectional view of the boot reinversion apparatus used for execution of the 2nd process of this invention method. FIG. 10 is a sectional view taken along line 10-10 in FIG. 9; FIG. 11 is an enlarged view of a portion 11 in FIG. 9. Explanatory drawing of the reinversion start of the inversion boot by the boot inversion apparatus. Explanatory drawing of the end of re-inversion of the inversion boot.

Explanation of symbols

B ... Boot B '... Reversing boot J ... Ball joint 1 ... Ball housing 2 ... Ball stud 6 ... Large bead groove 7 ... Small bead Groove 11 ... Large diameter bead 12 ... Small diameter bead 15 ... Boot reversing device 19 ... Boot receiving arm 24 ... Boot receiving base 26 ... Elevating shaft 26a ... Friction fitting shaft 30 ... Boot reversing device 31 ... Support (moving support)
32 ... Joint mounting table 34 ... Ironing arm 34a ... Ironing arm surface

Claims (5)

When mounting a boot (B) having a large-diameter bead (11) at one end and a smaller-diameter bead (12) at the other end than the large-diameter bead (11) to the ball joint (J), the ball joint In the method of mounting the boot on the ball joint, in which the large-diameter bead (11) is mounted in the large-diameter bead groove (6) on the outer periphery of the end of the ball housing (1) in (J),
A first step of reversing the boot (B) so that the front and back are reversed, and the reversing boot (B ′) reversed in the first step toward the original shape, the large diameter bead ( And 11) performing a second step of fitting the large-diameter bead groove (6). A boot mounting device to a ball joint for executing the boot mounting method to the ball joint according to claim 1,
A boot reversing device (15) used for the execution of the first step is provided. The boot reversing device (15) is a hollow boot cradle (24) on which the large-diameter bead (11) of the boot (B) is placed. And an ascending / descending shaft (26) that moves up and down between an ascending position spaced upward from the boot cradle (24) and a descending position where the lower end portion enters the hollow portion (17) of the boot cradle (24). The elevating shaft (26) is fitted with a friction resistance on the inner peripheral surface of the small-diameter bead (12) of the boot (B) on the boot cradle (24) at the lowered position, A device for attaching a boot to a ball joint, comprising a friction fitting shaft portion (26a) for drawing the small-diameter bead (12) into the hollow portion (17) of the boot cradle (24). In the boot mounting apparatus to the ball joint according to claim 2,
The boot receiving base (24) is constituted by a plurality of boot receiving arms (19) arranged in an annular shape, and the large-diameter beads (11) of the boot (B) of the boot receiving arm (19) group are placed thereon. A boot mounting device for a ball joint, wherein the upper end portion of the ball joint can be expanded and contracted in the radial direction. A boot mounting device to a ball joint for executing the boot mounting method to the ball joint according to claim 1,
A boot reversing device (30) used for execution of the second step is provided. The boot reversing device (30) is a joint mounting table on which the ball joint (J) is mounted with its one end facing upward. (32), the elevating shaft (26) disposed so as to be able to contact the upper end surface of the ball stud (2) of the ball joint (J) mounted on the joint mounting table (32), and the elevating shaft (26) is slidably attached to the ironing arm (34), and when this elevating shaft (26) is brought into contact with the upper end surface of the ball stud (2), the ironing arm (34) The small diameter bead (12) of the reversing boot (B ') that is lowered with respect to the lifting shaft (26) and adhered to the friction fitting shaft portion (26a) of the lifting shaft (26) is attached to the upper end surface of the ball stud (2). Reversing boot (B ') By squeezing the outer peripheral surface of the large-diameter bead (11), the reversing boot (B ') is re-inverted to the original shape so that the large-diameter bead (11) is mounted in the large-diameter bead groove (6) of the ball housing (1). A device for mounting a boot on a ball joint, characterized in that In the boot mounting apparatus to the ball joint according to claim 4,
A plurality of ironing arms (34) are pivotally supported on a support (31) that moves up and down separately from the elevating shaft (26), and are formed at the lower end of these ironing arms (34). A boot mounting device for a ball joint, wherein the ironing surface (34b) is expanded radially outward in accordance with the progress of ironing with respect to the reversing boot (B ').

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