JP2013160339A - Boot band - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a boot band capable of effectively preventing leakage of a lubricant in a joint by securing a pressing force (fastening force) in an inner-diameter direction, which is uniform over the circumference in a circumferential direction.SOLUTION: In a boot band, a band-like body 21 is rounded to form a ring portion 22, a diameter is reduced while externally fitting the ring portion 22 to a band mounting portion 15a (15b) of boots 15, and thereby fastening the mount portion 15a (15b) of the boots 15. A coupling portion 25 of the band-like body 21 includes a diameter dimension adjusting structure part M which includes a male portion 26 and a female portion 27 where the male portion 26 enters along a circumferential direction when the diameter of the ring portion 22 is reduced and brings the band mount portion of the boots 15 into tight contact with the coupling portion 25.

Description

  The present invention relates to a boot band, and more particularly to a boot band for a constant velocity universal joint.

  Constant velocity universal joints used in power transmission devices such as automobiles and various industrial machines are equipped with boots for the purpose of preventing leakage of grease sealed inside the joint and preventing foreign objects such as dust from entering the joint. The As a boot, in general, a large-diameter portion that is attached to the opening of the outer joint member of the constant velocity universal joint, and a small-diameter portion that is attached to the shaft fitted into the inner joint member of the constant velocity universal joint, It is comprised by the bending part (bellows part) which connects a large diameter part and a small diameter part.

  As a constant velocity universal joint, a fixed type constant velocity universal joint (for example, a Zepper type, a barfield type, etc.) that can take a large operating angle of about 45 to 50 deg. There are slidable constant velocity universal joints (for example, a double offset type, a tripod type, a cross groove type, etc.) that can slide in the axial direction of the joint member.

  FIG. 15 shows a fixed type constant velocity universal joint. The constant velocity universal joint includes an outer ring 111 as an outer joint member having a plurality of track grooves 112 formed on the inner peripheral surface, an inner ring 113 as an inner joint member having a plurality of track grooves 114 formed on the outer peripheral surface, and an outer ring 111. The main portion is composed of a plurality of balls 115 arranged on a ball track formed in cooperation with the track groove 112 of the inner ring 113 and the track groove 114 of the inner ring 113 and a cage 116 having a pocket 116a for accommodating the balls 115. It is configured. A shaft 117 is connected to the inner periphery of the inner ring 113 via torque transmission means such as serrations and splines.

  The boot 100 attached to such a constant velocity universal joint includes a small-diameter portion 101, a large-diameter portion 102, and a bellows portion 106 that connects the small-diameter portion 101 and the large-diameter portion 102. The bellows portion 106 is formed by alternately forming valley portions 104 and peak portions 105. The boot band 108 is fastened and fixed to the outer ring 111 with the large-diameter portion 102 of the boot 100 fitted in the opening of the outer ring 111 of the constant velocity universal joint. The small diameter portion 101 of the boot 100 is fixed to the shaft 117 by tightening the boot band 108 in a state where the small diameter portion 101 is externally fitted to the attached portion 120 of the shaft 117.

  Examples of the boot band 108 include those using a lever member (Patent Document 1 (FIG. 7)) and those called an omega band (Patent Document 1 (FIG. 10)). As shown in FIGS. 16 and 17, the lever member uses a band main body 126 made of a band-like metal material to be bent in a ring shape and joined in a state where both ends thereof are overlapped. The lever member 127 is fixed to one surface. Then, after forcibly turning back the lever member 127, the lever member 127 is overlapped with the outer surface of the band main body 126 and fixed with a stopper 128.

  A boot band 140 shown in FIG. 18 is obtained by rounding a belt-shaped member 139 into a ring shape and externally fitting it to a band mounting portion of the boot to reduce the diameter. When the belt-like member 139 is rolled into a ring shape, the projection 142 is engaged with the locking hole 141 from the inner diameter side, and the root portion of the convex portion 143 bulging to the outer diameter side is crimped as indicated by an arrow. The convex portion 143 has an Ω shape and generates a tightening force.

JP 2002-213484 A

  As shown in FIGS. 16 and 17, the lever member 127 is tilted to reduce the outer diameter of the boot band 108. After the boot band 108 is reduced in diameter, the lever member 127 is stopped. Fix with the tool 128. For this reason, the gap 135 is formed in the vicinity of the folded portion depending on the thickness of the lever member 127. Further, when the band mounting portion 121 is tightened by folding back the lever member 127, the gap 135 is not restricted by the boot band 108 and bulges to the outer diameter side. For this bulging, a bulging portion 132 is formed on the outer peripheral surface side of the boot, and a gap is formed between the inner peripheral surface of the boot 100 and the outer peripheral surface of the shaft 111 for forming the bulging portion 132. 133 will occur. That is, grease (lubricant) may leak through the gap 133 during use or the like due to a decrease in surface pressure. In addition, since the band diameter after the diameter reduction is constant, it is necessary to prepare a boot band for each constant velocity universal joint size and boot size.

  Moreover, even if it is what is shown in FIG. 18, since the strip | belt-shaped member 139 is rounded in a ring shape, an overlapping part will be formed. As described above, in the overlapping portion, a gap is easily generated between the inner diameter surface of the boot band and the outer diameter surface of the boot mounting portion. If there is a gap, there is a possibility of lubricant leakage.

  An object of the present invention is to propose a boot band that can ensure a uniform inner diameter direction pressing force (tightening force) in the entire circumference in the circumferential direction and can effectively prevent the leakage of lubricant inside the joint.

  The boot band of the present invention is a boot band that tightens the band mounting portion of the boot by rounding the belt-like body to form a ring portion and reducing the diameter of the ring portion while being externally fitted to the band mounting portion of the boot. When the diameter of the male portion and the ring portion is reduced, the male portion enters along the circumferential direction to closely contact the outer diameter surface of the band mounting portion and the inner diameter surface of the coupling portion. A diameter dimension adjusting structure portion provided with a female portion is provided.

  According to the boot band of the present invention, since the diameter dimension adjusting structure portion is provided, when reducing the diameter of the ring portion, the diameter can be reduced corresponding to the outer diameter size of the band mounting portion of the boot, The mounting portion can be tightened even for boots having different dimensions. In addition, since the female portion can closely contact the band mounting portion and the coupling portion of the boot, no gap is generated between the band mounting portion and the band of the boot.

  It is preferable to provide a hook structure that restricts the diameter of the ring portion between the male portion and the female portion. By providing the hook structure, the diameter of the ring portion is restricted and a stable tightening state can be maintained. The hook structure can be constituted by a sawtooth fitting structure.

  In the fitting state between the male part and the female part, it is also preferable to provide a lifting prevention structure part for preventing the male part from lifting in the outer diameter direction with respect to the female part. By providing the floating prevention structure, no gap is generated between the band mounting portion of the boot and the band.

  The floating prevention structure part can be configured by an engagement fitting structure between the male part and the female part. For this reason, lifting can be prevented with a simple structure.

  The lifting prevention structure portion may be a pressing lid portion that is provided on the female portion side and is engaged with the outer diameter surface of the male portion from the outer diameter side. If it is a pressing lid part, the male part can be prevented from being lifted stably.

  There may be provided a locking portion that locks the diameter reducing jig on the male portion side and the female portion side and enables the diameter reduction work of the ring portion by the diameter reducing jig. By providing such a locking portion, the diameter reducing operation by the diameter reducing jig is stabilized.

  The male part is an arc-shaped piece along the outer diameter surface of the mounting part of the boot in the ring part forming state, and the female part is an arc-shaped notch along the outer diameter surface of the mounting part of the boot in the ring part forming state, It is also preferable to provide a restricting structure that restricts the expansion of the female part in the width direction when the male part and the female part are fitted. By providing such a restriction structure, the expansion of the female part in the width direction is restricted, and the male part can be prevented from coming off from the female part.

  In the boot band of the present invention, the band mounting portion can be tightened even for boots having different dimensions, so that it can be used for various types of boots with a single type, thereby reducing the cost. Contribute. In addition, there is no gap between the boot band mounting part and the band, and a uniform tightening force can be applied to the boot band mounting part over the entire circumference, effectively leaking lubricant inside the joint. Can be prevented.

  By providing the hook structure, it is possible to maintain a stable tightening state, and it is possible to exhibit high-precision sealing performance for a long time with respect to the boot. The hook structure can be configured with a sawtooth fitting structure, and the configuration can be simplified.

  By providing the floating prevention structure portion, it is possible to prevent a gap from being generated between the band mounting portion of the boot and the band, and to exhibit a stable sealing performance with respect to the boot.

  The lifting prevention structure portion can be configured by an engagement fitting structure, a pressing lid portion, or the like, and the configuration can be simplified. By providing the locking portion, the diameter reduction operation by the diameter reduction jig is stabilized, and the workability of the tightening operation can be improved.

  By providing the regulation structure, the male part can be prevented from coming off from the female part, and the tightened state does not become loose or come off, and a stable mounting state can be maintained for a long period of time.

The 1st boot band of this invention is shown, (a) is a principal part enlarged plan view, (b) is a principal part enlarged plan view of (a). It is an enlarged side view which shows the mounting state of the boot band of the said FIG. It is sectional drawing of the constant velocity universal joint in which the boot band of the said FIG. 1 was used. Fig. 2 shows the boot band, wherein (a) is an enlarged cross-sectional view of a main part of Fig. 1, (b) is an enlarged cross-sectional view of a main part of a first modification of the boot band, and (c) is a boot band. FIG. 6 is an enlarged cross-sectional view of a main part of a second modified example of the present invention, (d) is an enlarged view of a main part of a third modified example of the boot band, and (e) is a main part of a fourth modified example of the boot band. It is an expanded sectional view. It is a principal part enlarged plan view of the 2nd boot band of this invention. FIG. 6 is an enlarged side view of a main part of the boot band of FIG. 5. FIG. 6 is an enlarged cross-sectional view of a main part of the boot band of FIG. 5. It is a principal part enlarged plan view of the 3rd boot band of this invention. It is a principal part expanded sectional view of the boot band of the said FIG. It is a principal part enlarged plan view of the 4th boot band of the present invention. It is a principal part expanded side view of the boot band of the said FIG. It is a principal part enlarged plan view of the 5th boot band of this invention. It is a principal part enlarged plan view of the 6th boot band of the present invention. It is a principal part expanded sectional view of the boot band of the said FIG. It is sectional drawing of the constant velocity universal joint using the conventional boot band. It is sectional drawing of the state with which the conventional boot band was mounted | worn. FIG. 17 is a cross-sectional view showing a state before the boot band of FIG. 16 is attached. It is a side view of the other conventional boot band.

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

  1 and 2 show a main part of a boot band according to the present invention, and this boot band is used, for example, for fixing a boot attached to a constant velocity universal joint as shown in FIG. FIG. 3 shows a fixed type constant velocity universal joint of an undercut free type. This fixed type constant velocity universal joint includes an outer joint member 3 in which a plurality of track grooves 2 are formed on the inner diameter surface 1 along the axial direction at equal intervals in the circumferential direction, and a track of the outer joint member 3 on the outer diameter surface 4. An inner joint member 6 in which a plurality of track grooves 5 paired with the groove 2 are formed along the axial direction at equal intervals in the circumferential direction, the track groove 2 of the outer joint member 3, and the track groove 5 of the inner joint member 6 A plurality of balls 7 that transmit torque between them, and a cage 8 that holds the balls 7 interposed between the inner diameter surface 1 of the outer joint member 3 and the outer diameter surface 4 of the inner joint member 6. I have. The cage 8 is provided with a plurality of pockets 8a for accommodating the balls 7 along the circumferential direction.

  The track groove 2 of the outer joint member 3 is composed of a straight portion 2a on the opening side and a curved portion 2b on the back side, and the track groove 5 of the inner joint member 6 is formed on the curved portion 5a on the opening side and the back side. The linear portion 5b.

  A female spline 11 is provided on the inner diameter surface of the shaft hole of the inner joint member 6, and a male spline 13 is formed at the end of the shaft 12 fitted into the shaft hole of the inner joint member 6. Then, the end of the shaft 12 is fitted into the axial hole of the inner joint member 6 so that the male spline 13 and the female spline 11 are fitted. The male spline 13 is provided with a retaining ring 14 for preventing the removal.

  The opening of the outer joint member 3 is closed by the boot 15. The boot 15 has a large-diameter portion 15 a fixed to the boot mounting portion 18 on the outer diameter surface on the opening side of the outer joint member 3 and a small-diameter fixed to the boot mounting portion 19 of the shaft 12 connected to the inner joint member 6. Part 15b, and a bellows part 15c provided between the large diameter part 15a and the small diameter part 15b. The large-diameter portion 15a and the small-diameter portion 15b are fixed by attaching the boot band 20 according to the present invention. In addition, the bellows part 15c is formed by alternately forming peaks 16 and valleys 17.

  In the constant velocity universal joint shown in FIG. 3, the boot mounting portion 18 of the outer joint member 3 is provided with a protrusion 18 a that engages with the inner diameter surface of the large diameter portion 15 a, and the boot mounting portion 19 of the shaft 12 includes A circumferential groove 19a with which the inner diameter surface of the small diameter portion 15b is engaged is provided.

  The boot band 20 is formed by rounding the belt-shaped body 21 to form a ring portion 22, and reducing the diameter of the ring portion 22 in a state where the ring portion 22 is externally fitted to the band mounting portion (large diameter portion 15 a or small diameter portion 15 b) of the boot 15. The band mounting portion (the large diameter portion 15a or the small diameter portion 15b) of the boot 15 is tightened.

  For this reason, as for the strip | belt-shaped body 21, the coupling | bond part 25 as shown in FIG. 1 is formed. In this case, the connecting portion 25 includes a diameter dimension adjusting structure portion M. The diameter dimension adjusting structure part M has a male part 26 and a female part 27 into which the male part 26 is fitted. That is, the band-shaped body 21 is provided with a band-shaped body main body 21a having a width dimension of W and one end of the band-shaped body main body 21a, and the width W1 is smaller than the width dimension W of the band-shaped body main body 21a. In a state where the portion 22 is not formed, a linear shape is formed on the extension line of the band-shaped body 21a, and in the state where the ring portion 22 is formed, an arc-shaped piece portion 28 is formed. The female portion 27 includes an arc-shaped cutout portion 29 that is provided at the other end of the band-shaped body 21a and allows the male portion 26 to enter the circumferential direction of the male portion 26 from the opening when the ring portion 22 is formed. .

  Between the male part 26 and the female part 27, a hook structure part 30 that restricts the diameter expansion of the ring part 22 is provided. The hook structure portion 30 is constituted by a sawtooth fitting structure 31 between the male portion 26 and the female portion 27. The saw tooth fitting structure 31 in this case includes a male tooth side tooth portion 31 a provided on both sides of the male portion 26 and a female tooth side tooth portion 31 b provided on both sides of the female portion 27.

  As shown in FIG. 1 (b), the male-side saw tooth portion 31 a has a large number of right-angled triangular protrusions 32 arranged in the longitudinal direction in plan view. The protrusion 32 includes a hypotenuse 32a whose height (width) increases from the distal end side to the proximal end side of the male portion 26, and an end face 32b extending in the width direction. The sawtooth portion 31b on the female portion side is formed by arranging a large number of right-angled triangular notches 33 along the longitudinal direction in plan view. The notch 33 includes a bottom 33a whose depth increases from the back side toward the opening side, and an end surface 33b extending in the depth (width) direction.

  For this reason, if the end portions of the band-shaped body 21 are brought close to each other as indicated by arrows A and A in FIG. 1 with the distal end portion of the male portion 26 inserted into the opening portion of the female portion 27, that is, a ring. If the diameter of the portion 22 is reduced, the hypotenuse 32a of the sawtooth portion 31a on the male portion side and the base 33a of the sawtooth portion 31b on the female portion side are slidably contacted to allow this approaching (reducing diameter) operation. When the diameter reducing operation is completed, as shown in FIG. 1B, the end surface 32b of the sawtooth portion 31a on the male portion side and the end surface 33b of the sawtooth portion 31b on the female portion side are engaged. Become. For this reason, in this engaged state, the diameter reduction operation in the directions of arrows A and A is allowed, but the diameter expansion operation in the directions of arrows B and B is restricted.

  By the way, the length dimension L1 of the male part 26 and the length dimension L2 of the female part 27 are set such that L2 ≧ L1.

  For this reason, the penetration | invasion amount (fitting amount) L3 of the male part 26 to the female part 27 can be adjusted, and if the fitting amount L3 is short, the diameter dimension of the ring part 22 formed will be large and fitting If the amount L3 is long, the diameter dimension of the ring portion 22 to be formed becomes small. For this reason, the diameter dimension of the ring part 22 can be variously changed by adjusting (adjusting) this fitting amount L3.

  Further, the thickness dimension T of the strip body 21a, the thickness dimension T1 of the male part 26, and the thickness dimension T2 of the female part 27 are set to be the same. For this reason, as shown in FIG. 1, in the state where the male part 26 is fitted to the female part 27, even in the coupling part 25, no stepped part is formed on the inner diameter surface. No gap is formed between the inner diameter surface 22 a of the ring portion 22 and the outer diameter surface 23 of the band mounting portion of the boot 15.

  Therefore, if the band mounting part (large diameter part 15a or small diameter part 15b) of the boot 15 is tightened with the boot band 20 which becomes the coupling part 25 provided with such a diameter dimension adjusting structure part M, the ring part 22 is formed. When the diameter of the boot 15 is reduced, the diameter of the boot 15 can be reduced in accordance with the outer diameter of the band mounting portion (large diameter portion 15a or small diameter portion 15b). The band mounting part can be tightened. For this reason, it can use with respect to the boot 15 of various sizes with one kind, and contributes to cost reduction. Moreover, since the female portion 27 can bring the band mounting portion (large diameter portion 15a or small diameter portion 15b) of the boot 15 into close contact with the coupling portion 25, a gap is formed between the band mounting portion of the boot 15 and the band 21. Without generating, a uniform tightening force can be applied to the band mounting portion of the boot 15 over the entire circumference, and leakage of the lubricant inside the joint can be effectively prevented.

  Since it has the catch part 30 comprised by the sawtooth part 31a on the male part side and the sawtooth part 31b on the female part side, a stable tightening state can be maintained, and the boot 15 is highly accurate over a long period of time. Sealing performance can be exhibited. The hook structure portion 30 can be configured with a saw tooth fitting structure 31, and the configuration can be simplified.

  Such a coupling portion 25 is not limited to one place, and may be provided at two or more places. When a plurality of coupling portions 25 are provided, a plurality of strips 21 are provided. For this reason, in the thing provided with the some coupling | bond part 25, the response | compatibility of the size of the band mounting part of various boots 15 can be performed stably. In addition, when providing the multiple strip | belt-shaped body 21, the length dimension of each strip | belt-shaped body 21 may be the same, or may differ.

  FIG. 4 shows the floating prevention structure 50 provided in the diameter dimension adjustment structure M. The lift prevention structure 50 shown in FIG. 4 is a so-called engagement fitting structure, and the lift prevention structure 50 shown in FIG. 4A is a tapered surface 35, 35 provided on the side of the male part 26. And tapered surfaces 36, 36 provided on the side of the female portion 27. That is, the taper surfaces 35 and 35 are tapered surfaces that are inclined so as to approach each other from the inner diameter side toward the outer diameter side. Similarly, the tapered surfaces 36 and 36 are also directed from the inner diameter side toward the outer diameter side. It is a taper surface which inclines so that it may adjoin.

  For this reason, the taper surfaces 35 and 35 of the male part 26 and the taper surfaces 36 and 36 of the female part 27 face each other, and the male part 26 is restricted from moving in the outer diameter direction with respect to the female part 27. Thus, the floating of the male part 26 with respect to the female part 27 can be prevented. In this case, the inclination angles θ1 and θ2 of the tapered surfaces 35 and 36 can be arbitrarily set.

  4B, the floating prevention structure 50 includes triangular protrusions 37 and 37 provided on the side of the male part 26, and triangular recesses 38 provided on the side of the female part 27. 38. In this case, the convex portion 37 has a first tapered surface 37a that is inclined so as to be separated from the outer diameter side toward the inner diameter side, and a second tapered surface 37b that is inclined so as to be separated from the inner diameter side toward the outer diameter side. And have. The recess 38 has a first tapered surface 38a that is inclined so as to be separated from the outer diameter side toward the inner diameter side, and a second tapered surface 38b that is inclined so as to be separated from the inner diameter side toward the outer diameter side.

  For this reason, the convex parts 37 and 37 of the male part 26 are fitted in the concave parts 38 and 38 of the female part 27, respectively, and the floating of the male part 26 with respect to the female part 27 is prevented. It should be noted that the inclined state of the tapered surfaces 37a, 37b of the convex portion 37 and the tapered surfaces 38a, 38b of the concave portion 38 can be maintained, and the edge portion (the apex of the tapered portion mating portion) is not damaged. Various changes can be made within the range.

  The lifting prevention structure 50 shown in FIG. 4 (c) is composed of a semicircular arc convex surface 40, 40 provided on the side of the male part 26 and a semicircular arc concave surface 41, 41 provided on the side of the female part 27. Become. For this reason, the cross-section quarter-arc convex surfaces 40, 40 of the male part 26 are fitted to the cross-section quarter-arc concave surfaces 41, 41 of the female part 27, respectively, to prevent the male part 26 from being lifted with respect to the female part 27.

  4D includes convex curved surfaces 42 and 42 provided on the side of the male part 26 and concave curved surfaces 43 and 43 provided on the side of the female part 27. The floating prevention structure 50 shown in FIG. For this reason, the convex curved surfaces 42 and 42 of the male part 26 are fitted to the concave curved surfaces 43 and 43 of the female part 27, respectively, to prevent the male part 26 from being lifted with respect to the female part 27.

  The lifting prevention structure 50 shown in FIG. 4 (e) has a configuration opposite to that of the lifting prevention structure 50 shown in FIG. 4 (b). That is, the concave portion 44 having a triangular cross section is provided on the side of the male portion 26, and the convex portion 45 having a triangular cross section is provided on the side of the female portion 27.

  The recess 44 includes a first tapered surface 44a that is inclined so as to approach from the outer diameter side toward the inner diameter side, and a second tapered surface 44b that is inclined so as to approach from the inner diameter side toward the outer diameter side. The convex portion 45 includes a first tapered surface 45a that is inclined so as to approach from the outer diameter side toward the inner diameter side, and a second tapered surface 45b that is spaced from the inner diameter side toward the outer diameter side.

  For this reason, the convex parts 45, 45 of the female part 27 are fitted into the concave parts 44, 44 of the female part 27, respectively, and the floating of the male part 26 with respect to the female part 27 is prevented. It should be noted that the inclined state of the tapered surfaces 45a and 45b of the convex portion 45 and the tapered surfaces 44a and 44b of the concave portion 44 can be maintained, and the edge portion (the apex of the tapered portion mating portion) is not damaged. Various changes can be made within the range.

  5 and FIG. 6 is configured by a pressing lid portion 54 including a pair of projecting pieces 51 and 51 arranged so as to face each other. Two holding lids 54 are arranged at predetermined intervals along the longitudinal direction of the female part 27. The protruding pieces 51 and 51 cover a part of the cutout portion constituting the female portion 27 from the outer diameter side. Note that a predetermined distance 53 is provided between the projecting pieces 51 and 51.

  8 and FIG. 9 is the lifting prevention structure 50 shown in FIGS. 5 and 6. The lifting prevention structure 50 shown in FIGS. 5 and 6 includes a bridge 52 formed by connecting projecting pieces 51 and 51 facing each other. Is configured.

  5 and FIG. 6 and the lifting prevention structure 50 shown in FIGS. 8 and 9, the protrusions 51, 51 and the bridge 52 have the male part 26. The floating with respect to the female part 27 can be prevented.

  By providing the floating prevention structure portion 50, it is possible to prevent a gap from being generated between the band mounting portion (the large diameter portion 15a or the small diameter portion 15b) of the boot 15 and the band 20, and to stably seal the boot 15. Can be demonstrated. In addition, even if it is the lifting prevention structure part 50 shown in FIG. 5 etc., even if it is the lifting prevention structure part 50 shown in FIG. One may be sufficient.

  Next, in FIG. 10 and FIG. 11, a diameter reducing jig (not shown) is locked to the male part side and the female part side, and the diameter reducing operation of the ring part 22 by this diameter reducing jig can be performed. Locking portions 55a and 55b are provided.

  The locking portions 55a and 55b protrude to the outer diameter side, and the locking portion 55a on the male portion side is provided on the distal end side of the male portion 26 and extends to the male base end side in the outer diameter direction. Have The locking part 55b on the female part side is provided on the belt-like body 21a in the vicinity of the back part of the notch 29, and has a locking end face 57 extending in the outer diameter direction on the side opposite to the female part.

  For this reason, the not-shown diameter-reducing jig is locked to the locking end surface 56 of the locking portion 55a and the locking end surface 57 of the locking portion 55b, thereby approaching each other in the directions of arrows A and A. And the diameter of the ring portion can be reduced. By providing the locking portions 55a and 55b, the diameter reduction operation by the diameter reduction jig is stabilized, and the workability of the tightening operation can be improved.

  FIG. 12 is provided with a regulating structure 60 that regulates the expansion of the female part 27 in the width direction when the male part 26 and the female part 27 are fitted. In this case, the angle α with respect to the axis L at the end face 32b of the projection 32 of the saw tooth portion 31a of the male portion 26 is an acute angle. That is, α <90 °. For this reason, the angle β with respect to the axis L at the end surface 33b of the notch 33 of the saw tooth portion 31a of the female portion 27 is an acute angle. That is, β <90 °.

  As described above, the angle α with respect to the axis L of the end surface 32b of the protrusion 32 is an acute angle, and the angle β with respect to the axis L of the end surface 33b of the notch 33 is set to an acute angle, thereby restricting the expansion of the female portion 27 in the width direction. be able to. As long as the angles α and β are allowed to reduce the diameter of the ring portion 22 and the sawtooth portions 31a and 31b can mesh with each other so as to restrict the diameter expansion in a state where the diameter is reduced to a predetermined diameter. Good.

  In FIG. 13 and FIG. 14, the restricting structure 60 is constituted by the clip member 61. The clip member 61 includes a strip-shaped clip body 61a extending along the width direction of the female portion 27, hanging pieces 61b and 61b hanging from both ends of the clip body 61a, and hanging pieces of the hanging pieces 61b and 61b. It is comprised with the locking pieces 61c and 61c extended in the width direction inner side from an edge.

  As shown in FIG. 14, the clip member 61 is attached from the outer diameter side in the coupling portion 25, and the locking pieces 61c and 61c are brought into contact with the other end portion of the side edge 66 of the main body 21a. Contact or pressure contact. In this way, by attaching the clip member 61, the expansion of the female portion 27 in the width direction can be restricted. The number of clip members 61 to be mounted is arbitrary.

  If the restricting structure 60 is provided, the male part 26 can be prevented from coming off from the female part 27, and the tightened state is not loosened or detached, so that a stable mounting state can be maintained over a long period of time.

  As described above, the embodiments of the present invention have been described. However, the present invention is not limited to the above embodiments, and various modifications are possible. For example, in the illustrated example, an undercut-free fixed constant velocity universal joint is used. However, even if it is a Rzeppa type fixed constant velocity universal joint whose track groove is composed only of an arc portion, it is a sliding type constant velocity universal joint such as a double offset type, a cross groove type, or a tripod type. Also good.

  In the embodiment, the boot may be a CR (chloroprene) rubber boot, a silicon boot, or a resin boot. The resin boot is formed of, for example, a thermoplastic elastomer such as ester, olefin, urethane, amide, or styrene.

21 Band-shaped body 22 Ring part 25 Coupling part 26 Male part 27 Female part 28 Arc-like piece part 29 Arc-like notch part 30 Hook structure part 31a, 31b Saw-tooth part 31 Saw-tooth fitting structure 50 Prevention structure part 52 Holding lid part 55a 55b Locking part 60 Restriction structure

Claims (8)

A ring band is formed by rounding a belt-like body, and the ring part is a boot band that tightens the band mounting part of the boot by reducing the diameter in a state of being fitted to the band mounting part of the boot,
In the coupling portion of the band-shaped body, when the diameter of the ring portion is reduced, the male portion enters along the circumferential direction and closely contacts the outer diameter surface of the band mounting portion and the inner diameter surface of the coupling portion. A boot band characterized by comprising a diameter dimension adjusting structure provided with   The boot band according to claim 1, wherein a hook structure is provided between the male part and the female part to restrict the diameter of the ring part.   The boot band according to claim 2, wherein the hook structure is a sawtooth fitting structure.   The lifting prevention structure part which prevents the lifting of the outer diameter direction of the male part with respect to a female part in the fitting state of a male part and a female part is provided, The any one of Claims 1-3 characterized by the above-mentioned. The boot band as described in.   The boot band according to claim 4, wherein the floating prevention structure part is an engagement fitting structure between a male part and a female part.   The boot band according to claim 4, wherein the lifting prevention structure portion is a pressing lid portion provided on the female portion side and engaging with the outer diameter surface of the male portion from the outer diameter side.   2. A locking part is provided on the male part side and the female part side, and a locking part is provided that enables the ring part to be reduced in diameter by the reducing diameter jig. The boot band according to claim 6.   The male part is an arc-shaped piece along the outer diameter surface of the band mounting part of the boot in the ring part forming state, and the female part is an arc-shaped notch part along the outer diameter surface of the band mounting part of the boot in the ring part forming state. The boot according to any one of claims 1 to 7, further comprising a restriction structure that restricts expansion of the female portion in the width direction when the male portion and the female portion are fitted to each other. band.

Images