JP4926999B2 - Fastening band and method of manufacturing the fastening band - Google Patents

Description

  The present invention relates to a tightening band and a method for manufacturing the tightening band.

Conventionally, a boot for preventing intrusion of dust or the like and leakage of grease filled in the joint is attached to the constant velocity joint by a tightening band. Such a tightening band is tilted with a band-shaped band member having an annularly curved joint portion where inner peripheral surfaces of both ends are joined and a base end portion fixed to the joint portion and disposed on the band member side as a fulcrum. There are some provided with an arc-shaped lever that reduces the inner diameter of the band member and a buckle that fixes the lever to the band member. In Patent Document 1, the first end portion is adjacent to the buckle, and is formed so as to cover the gap on the inner peripheral side of the folded portion of the band member bent by the inclination of the lever along the circumferential direction. A tightening band is disclosed in which the arc-shaped plate is provided to reduce the non-contact portion of the boot (tightening object) with the tightening band and to improve the sealing performance.
JP 2006-161869 A

  By the way, the constant velocity joint includes a non-circular outer race in which the cross-sectional shape of the outer race is different from the tightening shape (circular shape) of the fastening band, for example, a tripod type constant velocity joint in which convex portions and concave portions are alternately formed on the outer periphery of the outer race. There is. When attaching the boot to such a constant velocity joint, for example, the grommet formed so that the inner peripheral side is in close contact with the convex part and the concave part and the outer peripheral side is formed in a circular shape is arranged in the outer race, so that the boot and Tightening is performed without a gap between the outer race.

  However, since the boot and the grommet are formed of a relatively soft resin material, the thickness of the non-rigid material interposed between the fastening band and the outer race is increased as compared with the outer race having a circular cross section. As a result, there is a problem that when the lever is tilted, the plate arranged on the inner peripheral side of the base end portion is easily deformed, and the sealing performance is deteriorated. This problem is not limited to the case of using a grommet, but the boot is attached to the outer race having a non-circular cross section, such as by thickening a part of the boot so that the outer periphery becomes circular according to the cross-sectional shape of the outer race. It happens in the same way.

  Therefore, it is conceivable to increase the rigidity of the plate by increasing the thickness of the plate. In this case, the band member and the boot are formed on the second end side opposite to the first end portion in the circumferential direction of the plate. A problem arises in that the gap between the two portions, that is, the non-contact portion with the fastening band of the boot becomes large and the sealing performance deteriorates.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a tightening band that can increase the thickness of the plate while suppressing a decrease in sealing performance, and a method for manufacturing the same. is there.

In order to achieve the above object, the invention described in claim 1 is a band-shaped band member having a joint portion which is curved in an annular shape and joined to the inner peripheral surfaces of both ends, and is fixed to the joint portion on the band member side. An arc-shaped lever for reducing the inner diameter of the band member by tilting with the base end portion disposed as a fulcrum, a plate-like base fixed to the inner peripheral surface, and protruding radially outward from both ends of the base And a buckle for fixing the lever to the band member, and a band member fixed to the inner peripheral surface and having a first end adjacent to the buckle and bent by tilting the lever. And an arc-shaped plate formed so as to cover the gap on the inner peripheral side of the folded portion along the circumferential direction, and the lever is tilted along the band member to tighten the object to be tightened. A tightening band to be attached, wherein the second end opposite to the first end in the circumferential direction of the plate is thinner than the plate and at least a part of the upper surface in the tightened state. A projecting portion that contacts the inner peripheral surface and at least a portion of the lower surface contacts the object to be tightened is formed , and an end surface that connects the upper surface and the lower surface is formed on the distal end side of the projecting portion. Is the gist.

  According to the said structure, the increase in the non-contact part (part which cannot be clamp | tightened) with the clamp | tightening band of the clamp | tightening target object in the 2nd edge part side resulting from a plate becoming thick by a protrusion part can be reduced. It becomes possible, and the thickness of the plate can be increased while suppressing a decrease in sealing performance. Therefore, it is possible to attach boots while maintaining good sealing performance even for outer races with a non-circular cross section by making the plate thick enough to prevent the plate from deforming due to the tilt of the lever while suppressing deterioration in sealing performance due to the protruding part. become. Since the first end of the plate is adjacent to the base of the buckle, the increase in the non-contact portion of the object to be tightened with the tightening band can be suppressed even if the plate becomes thick, and the sealing performance is ensured. it can.

Here, when the tip of the protrusion is sharp, such as a taper shape that fills the gap between the band member and the tightening object, the tip of the protrusion is There is a risk of damaging the tightening object by, for example, being stuck in the tightening object. In this regard, according to the above configuration, since the end surface connecting the upper surface and the lower surface is formed on the distal end side of the projecting portion, the distal end of the projecting portion is stuck in the object to be tightened by tightening the band member. This can prevent the tightening object from being damaged.

According to a second aspect of the invention, the clamping band of claim 1, wherein the plate and the protrusion is crushed tip of the width narrowing tapered shape formed in a plate-like member increases toward the distal end The gist is that they were formed integrally.

  According to the above configuration, since the plate-like member is formed in a tapered shape whose width becomes narrower toward the tip, even if the tip is crushed to form the protrusion, the width of the protrusion is larger than the width of the plate. Can also be prevented. As a result, for example, it is possible to attach the tightening band without changing the width of the portion to which the tightening band is attached in the tightening target, and it is not necessary to change the design of the conventional tightening target, thereby preventing an increase in cost. . Further, since the plate and the protrusion are integrally formed, for example, the protrusion can be easily formed as compared with a case where the protrusion is formed separately from the plate and attached by welding or the like.

The gist of the invention described in claim 3 is that, in the fastening band according to claim 1 or 2 , the plate is formed to have a thickness of ½ or more of the thickness of the lever. According to the said structure, a plate becomes difficult to deform | transform by forming the thickness of a plate into the thickness more than 1/2 of the thickness of a lever, and it can suppress a sealing performance fall.

Invention of Claim 4 makes it the summary that the thickness of the said protrusion part was formed identically with the thickness of the said base in the fastening band as described in any one of Claims 1-3. . According to the above configuration, the non-contact portion of the fastening object on the second end side of the plate with the fastening band of the fastening object is a non-contact portion of the buckle with the fastening band of the fastening object on the side opposite to the side adjacent to the plate. Will be equal. Therefore, it becomes possible to ensure the same sealing performance as the sealing performance on the side opposite to the side adjacent to the buckle plate, and the sealing performance on the second end side of the plate is uniformly sealed over the entire circumference. Boots can be worn in the state.

According to a fifth aspect of the present invention, there is provided a band-shaped band member having a joint portion that is curved in an annular shape and has inner peripheral surfaces at both ends joined thereto, and a base end portion that is fixed to the joint portion and disposed on the band member side. An arc-shaped lever that reduces the inner diameter of the band member by tilting as a fulcrum, a plate-like base fixed to the inner peripheral surface, and a pressing portion that protrudes radially outward from both ends of the base, A buckle that fixes the lever to the band member, and an inner peripheral side of a folded portion of the band member that is fixed to the inner peripheral surface and has a first end adjacent to the buckle and is bent by tilting the lever. An arc-shaped plate formed so as to cover the gap in the circumferential direction and tilting the lever along the band member to tighten a tightening object. In this method, the tip of the plate-like member formed in a tapered shape whose width decreases toward the tip is crushed, and at least a part of the upper surface is in contact with the inner peripheral surface in a clamped state. The gist of the invention is to form a protruding portion with a part of the lower surface in contact with the object to be tightened integrally with the plate at a second end opposite to the first end in the circumferential direction of the plate. . According to the said structure, the effect similar to the invention of Claim 2 is acquired.

  According to the present invention, it is possible to provide a tightening band capable of increasing the thickness of a plate while suppressing a decrease in sealing performance and a method for manufacturing the same.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
As shown in FIG. 1, the tightening band 11 is used to attach a boot 14 via a grommet 13 to an outer race 12 constituting a tripod type constant velocity joint. The cross-sectional shape of the outer race 12 is formed in a non-circular shape having convex portions 15 and concave portions 16 alternately along the circumferential direction. Further, the grommet 13 is formed so that the inner peripheral side thereof is in close contact with the convex portion 15 and the concave portion 16 according to the shape of the outer race 12, and the outer peripheral side is formed in a circular shape. A boot 14 having an annular cross-sectional shape of the attachment portion is attached to the outer race 12 by the fastening band 11 with no gap therebetween, so that dust or the like enters the joint or leaks grease filled inside the joint. Is to prevent. The grommet 13 and the boot 14 are made of a relatively soft resin material. In this embodiment, the grommet 13 is made of, for example, an olefin-based thermoplastic elastomer (TPO), and the boot 14 is made of, for example, an ester. It is made of a thermoplastic elastomer (TPEE).

  The fastening band 11 includes a band member 21 made of a band-shaped metal material, and the band member 21 has a joint portion 23 that is curved in an annular shape and the inner peripheral surfaces 22 of both ends thereof are joined to each other. A lever 24 made of a metal material thicker than the band member 21 and formed in an arc shape having substantially the same curvature as the band member 21 is fixed to the joint portion 23. The lever 24 is fixed to the joint portion 23 at the approximate center on the convex surface side, and the length from the fixing position to the base end portion 25 (the end portion disposed on the band member 21 side, the lower side in FIG. 1). Is longer than the length of the joint 23. The lever 24 tilts along the band member 21 to reduce the inner diameter of the band member 21. In the present embodiment, the thickness of the band member 21 is 0.4 mm, and the thickness of the lever 24 is 1.2 mm. Further, the band member 21 is formed so that the diameter at the time of tightening is about 100 mm.

  A buckle 26 made of a metal material that fixes the lever 24 to the band member 21 is provided on the inner peripheral surface 22 of the band member 21. The buckle 26 includes a plate-like base 27 that is fixed to the inner peripheral surface 22, and a pressing portion 28 that protrudes radially outward from both ends of the base 27, and the lever 24 is bent by bending the pressing portion 28. The band member 21 is fixed. In this embodiment, the thickness of the base 27 is 0.4 mm, and it is between the band member 21 and the boot 14 on the circumferential end side (lower side in FIG. 1) of the buckle 26 after tightening. The gap is sufficiently small so that the sealing performance by the fastening band 11 is ensured.

  Further, a plate 29 made of an arcuate metal material having substantially the same curvature as the band member 21 as shown in FIGS. 2A and 2B is fixed to the inner peripheral surface 22 of the band member 21. Has been. The plate 29 has a first end 30 (right side in FIG. 1) adjacent to the buckle 26, and as shown in FIG. 3, the inner periphery of the folded portion 31 in the band member 21 bent by the tilt of the lever 24. It is formed so as to cover the gap on the side along the circumferential direction. Therefore, as shown in FIG. 1, the plate 29 is arranged on the inner peripheral side of the base end portion 25 in the band member 21. Further, as shown in FIGS. 2A and 2B, the plate 29 is provided with ridges 32 extending along the longitudinal direction of the plate 29 at both ends in the width direction, so that the cross section of the plate is approximately. It is formed in a U shape. In this embodiment, each member (the band member 21, the lever 24, the buckle 26, and the plate 29) of the fastening band 11 is formed of a stainless steel material such as SUS430.

  The second end 33 (the left side in FIG. 1) opposite to the first end 30 in the circumferential direction of the plate 29 is tapered along the circumferential direction so that the width decreases toward the tip. A protruding portion 41 formed in a shape is formed. As shown in FIG. 4, the protrusion 41 is thinner than the plate 29, and the tip of the upper surface 42 comes into contact with the inner peripheral surface 22 of the band member 21 in a tightened state, and the entire lower surface 43 serves as a tightening object. The boot 14 is contacted. Further, an end surface 44 that connects the upper surface 42 and the lower surface 43 is formed on the distal end side of the protruding portion 41. In the present embodiment, the end surface 44 is formed along the thickness direction. Further, the protrusion 41 has the same thickness (0.4 mm) as the base 27, is formed with a uniform thickness along the circumferential direction, and has a step between the plate 29. The thickness of the plate 29 is 0.6 mm thicker than the protruding portion 41, that is, a thickness of ½ or more of the lever 24. The upper end of the end surface 44 is in contact with the inner peripheral surface 22 of the band member 21, and the lower end of the end surface 44 is not in contact with the inner peripheral surface 22.

  The tightening band 11 configured as described above uses the base end portion 25 as a fulcrum to contact the band member 21 and tilts the lever 24 along the band member 21 by using the lever action, thereby The inner diameter of 21 is reduced, and as shown in FIG. 3, the boot 14 is attached to the outer race 12 via the grommet 13 therebetween. Here, since the outer race 12 has a non-circular cross-sectional shape, the thickness of the non-rigid material (grommet 13 and boot 14) interposed between the fastening band 11 and the outer race 12 is increased as compared with the outer race having a circular cross section. As a result, the plate 29 is easily deformed.

  In this regard, in this embodiment, as shown in FIG. 4, the protrusion 41 is tightened because the tip of the upper surface 42 is in contact with the inner peripheral surface 22 of the band member 21 and the lower surface 43 is in contact with the boot 14. The boot 14 is tightened by tightening the band 11. Therefore, the increase in the non-contact portion (the portion that cannot be tightened) S with the tightening band 11 of the boot 14 on the second end 33 side of the plate 29 due to the thickening of the plate 29 by the protruding portion 41 can be reduced. It becomes possible, and the thickness of the plate 29 can be increased while suppressing a decrease in sealing performance. And since the thickness of the plate 29 is formed to be 1/2 or more of the thickness of the lever 24, the plate 29 has a thickness that is difficult to be deformed by the tilt of the lever 24. However, it is possible to wear the boot 14 while maintaining good sealing performance. Since the first end 30 side of the plate 29 is adjacent to the base 27 of the buckle 26, an increase in the non-contact portion S with the fastening band 11 of the boot 14 can be suppressed even when the plate 29 becomes thick. Can be secured. Further, in order to ensure sealing performance, the thickness of the plate 29 is formed to be 1/2 or more of the lever 24, and the difference in thickness between the base 27 and the plate 29 and the difference in thickness between the protrusion 41 and the plate 29 are reduced. Most preferably, it is 0.4 mm or less. This is because the increase in the non-contact portion between the base 27 and the inner peripheral surface 22 and the non-contact portion between the plate 29 and the inner peripheral surface 22 can be reduced.

Next, a method for manufacturing the fastening band 11 will be described.
As shown in FIG. 5, the plate 29 bends both ends in the short direction of the plate-like member 51 formed in a tapered shape that becomes narrower toward the distal end to form the ridge 32 and the band member 21. It is formed by curving into an arc shape having substantially the same curvature. The protrusion 41 is formed by crushing the tip 52 of the plate-like member 51 and is formed integrally with the plate 29. Thereby, it can prevent that the width | variety of the protrusion part 41 becomes larger than the width | variety of the plate 29, and as shown in FIG. 6, even if it does not change the width | variety of the accommodation groove | channel 61 in which the fastening band 11 in the boot 14 is attached, it is a fastening band. 11 can be attached. Then, the fastening band 11 is manufactured by assembling the formed band member 21, the lever 24, and the buckle 26 by welding or the like.

As described above, according to the present embodiment, the following operations and effects are achieved.
(1) The tightening band 11 includes a band member 21, a lever 24 that reduces the inner diameter of the band member 21 by tilting with the base end portion 25 as a fulcrum, a buckle 26 that fixes the lever 24 to the band member 21, The first end portion 30 is provided with an arc-shaped plate 29 that is adjacent to the buckle 26 and covers the gap on the inner peripheral side of the folded portion 31 along the circumferential direction. On the second end portion 33 of the plate 29, a protruding portion 41 is formed which is thinner than the plate 29 and is tightened so that the tip of the upper surface 42 contacts the inner peripheral surface 22 and the lower surface 43 contacts the boot 14. Therefore, the increase in the non-contact portion (the portion not to be tightened) S with the tightening band 11 of the boot 14 on the second end 33 side of the plate 29 due to the thickening of the plate 29 can be reduced by the protruding portion 41. It becomes possible, and the thickness of the plate 29 can be increased while suppressing a decrease in sealing performance. Therefore, by suppressing the deterioration of the sealing performance by the protruding portion 41, the thickness of the plate 29 is set so as not to be deformed by the inclination of the lever 24, so that the boot 14 can be attached to the outer race 12 having a non-circular cross section while maintaining a good sealing performance. It becomes possible to install.

  (2) If the tip of the protrusion is sharp, such as a taper shape that fills the gap between the band member 21 and the boot 14, the tip of the protrusion is tightened by tightening the band member 21. May pierce the boot 14 and damage the boot 14. In this regard, according to the present embodiment, since the end surface 44 that connects the upper surface 42 and the lower surface 43 is formed on the distal end side of the projecting portion 41, the distal end of the projecting portion 41 is tightened by tightening the band member 21. The object can be prevented from being stabbed and the boot 14 can be prevented from being damaged.

  (3) The plate 29 and the projecting portion 41 are integrally formed by crushing the tip portion 52 of the plate-like member 51 formed in a tapered shape whose width decreases toward the tip. Therefore, even if the tip portion 52 is crushed to form the protruding portion 41, the width of the protruding portion 41 can be prevented from becoming larger than the width of the plate. Thus, for example, it is possible to attach the tightening band 11 without changing the width of the receiving groove 61 to which the tightening band 11 is attached in the boot 14. Can be prevented. In addition, since the plate 29 and the protrusion 41 are integrally formed by crushing the tip 52, for example, compared to a case where the protrusion is formed separately from the plate and attached by welding or the like. The protrusion 41 and the plate 29 can be formed.

(4) By forming the plate 29 to a thickness that is 1/2 or more of the thickness of the lever 24, the plate 29 becomes difficult to be deformed, and a decrease in sealing performance can be suppressed.
(5) Since the thickness of the projecting portion 41 is the same as the thickness of the base 27, the non-contact portion S with the fastening band 11 of the boot 14 on the second end 33 side of the plate 29 is separated from the plate 29 of the buckle 26. It is equal to the non-contact portion of the boot 14 with the tightening band 11 on the opposite side of the adjacent side. Therefore, the sealing performance at the second end 33 of the plate 29 can be ensured to be the same as the sealing performance at the opposite side of the buckle 26 adjacent to the plate 29, and is uniform over the entire circumference. The boot 14 can be mounted in a state where it is sealed.

In addition, you may implement this embodiment in the following aspects.
In the above embodiment, the plate 29 and the protruding portion 41 are integrally formed by crushing the tip portion 52. However, the present invention is not limited to this, and the protruding portion is formed separately from the plate and attached by welding or the like. You may do it.

  In the above embodiment, the thickness of the protruding portion 41 is the same as that of the base 27 of the plate 29, but is not limited thereto, and may be a thickness different from that of the base 27 as long as it is thinner than the thickness of the plate 29.

  In the above embodiment, the end surface 44 is formed along the thickness direction, but the present invention is not limited to this, and the end surface 44 may not be along the thickness direction. Further, the end face does not have to be formed in a flat shape, and may have another shape such as an arc shape in cross section.

In the above embodiment, the end surface 44 is formed on the tip end side of the protruding portion 41. However, the present invention is not limited to this, and the tip end side of the protruding portion 41 may be formed in a tapered shape in which the upper surface 42 and the lower surface 43 are directly connected. Good.
In the above embodiment, the protrusion 41 is formed with a uniform thickness along the circumferential direction and has a step between the plate 29, but the upper surface 42 of the plate 29 is not limited thereto. You may make it taper-shaped which contacts the internal peripheral surface 22 of the band member 21 from the 2nd end part 33 to the upper end of the end surface 44. FIG.

In the above embodiment, the entire surface of the lower surface 43 is in contact with the boot 14. However, the present invention is not limited to this, and a part of the lower surface 43 may be in contact with the boot 14.
In the above-described embodiment, the protrusions 32 are erected on the plate 29 and the cross section thereof is substantially U-shaped. However, the present invention is not limited thereto, and the ridges 32 may not be erected on the plate 29. In this case, it is necessary to make the plate 29 thicker than the case where the protrusion 32 is erected.

  In the above embodiment, the grommet 13 is interposed between the outer race 12 and the boot 14. However, the present invention is not limited to this, and the cross-sectional shape of the mounting portion of the boot 14 is changed to the convex portion 15 and the concave portion 16 according to the shape of the outer race. The grommet as a tightening object may be arranged on the outer periphery thereof. Further, the cross-sectional shape of the inner periphery of the boot may be formed so as to be in close contact with the convex portion 15 and the concave portion 16, and the outer periphery may be circular so that the grommet is not used.

  In the above embodiment, the present invention is applied to the case where the boot 14 is attached to the outer race 12 of the tripod type constant velocity joint. However, the present invention is not limited to this, and the outer race may be a constant velocity joint having a circular cross-sectional shape. .

The front view of the fastening band before fastening. (A) Plan view of plate, (b) Front view of plate. The front view of the tightening band after tightening. FIG. 4 is a partial cross-sectional view of a tightening band after tightening. The top view of a plate-shaped member. The partial side view of the boot provided with the clamp band.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Fastening band, 12 ... Outer race, 14 ... Boot, 21 ... Band member, 22 ... Inner peripheral surface, 23 ... Joint part, 24 ... Lever, 25 ... Base end part, 26 ... Buckle, 27 ... Base, 28 ... Holding Part, 29 ... plate, 30 ... first end part, 31 ... folded part, 33 ... second end part, 41 ... projecting part, 42 ... upper surface, 43 ... lower surface, 44 ... end face, 51 ... plate-like member, 52 ... Tip.

Claims (5)

A band-shaped band member having a joint portion which is curved in an annular shape and the inner peripheral surfaces of both ends are joined;
An arc-shaped lever that reduces the inner diameter of the band member by tilting with a base end portion fixed to the joint portion and disposed on the band member side as a fulcrum;
A plate-like base fixed to the inner peripheral surface and a pressing portion protruding radially outward from both ends of the base, and a buckle for fixing the lever to the band member;
The first end portion is fixed to the inner peripheral surface and is adjacent to the buckle, and covers the gap on the inner peripheral side of the folded portion of the band member bent by the tilting of the lever along the circumferential direction. A tightening band for tightening an object to be tightened by tilting the lever along the band member,
The second end portion, which is the opposite side of the first end portion in the circumferential direction of the plate, is thinner than the plate and at least part of the upper surface is in contact with the inner peripheral surface in a tightened state. A protrusion is formed in which at least a part of the lower surface comes into contact with the tightening object ,
The fastening band according to claim 1, wherein an end face that connects the upper surface and the lower surface is formed on a distal end side of the protrusion . The fastening according to claim 1, wherein the plate and the protruding portion are integrally formed by crushing a tip portion of a plate-like member formed in a tapered shape whose width becomes narrower toward the tip. band. The fastening band according to claim 1 or 2 , wherein the plate is formed to have a thickness that is 1/2 or more of a thickness of the lever. The fastening band according to any one of claims 1 to 3 , wherein a thickness of the protruding portion is formed to be the same as a thickness of the base. A band-shaped band member having a joint portion which is curved in an annular shape and the inner peripheral surfaces of both ends are joined;
An arc-shaped lever that reduces the inner diameter of the band member by tilting with a base end portion fixed to the joint portion and disposed on the band member side as a fulcrum;
A plate-like base fixed to the inner peripheral surface and a pressing portion protruding radially outward from both ends of the base, and a buckle for fixing the lever to the band member;
The first end portion is fixed to the inner peripheral surface and is adjacent to the buckle, and covers the gap on the inner peripheral side of the folded portion of the band member bent by the tilting of the lever along the circumferential direction. An arc-shaped plate formed, and a method of manufacturing a tightening band for tightening an object to be tightened by tilting the lever along the band member,
The tip part of the plate-like member formed in a tapered shape whose width becomes narrower toward the tip is crushed, and at least a part of the upper surface comes into contact with the inner peripheral surface and is at least a part of the lower surface in a clamped state. A method of manufacturing a tightening band, comprising: forming a protrusion that contacts the object to be tightened integrally with the plate at a second end opposite to the first end in the circumferential direction of the plate. .

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