JP2008082396A - Constant velocity universal joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a practicable fastening band without easily leaking grease, by improving fixing strength and sealability of a fastening object member, by providing large fastening force, while sufficiently having the function of restraining a variation in the fastening force by a manufacturing error in the fastening object member and the fastening band. <P>SOLUTION: The fastening band fastens and fixes the fastening object member to a mating member, by engaging claws 13a and 13b with holes 14a and 14b in a state of superposing its both end parts 12a and 12b by diametrically contracting a belt-like body 12 in an annular ring shape, by forming the holes 14a and 14b in its other end part 12b, and forming the claws 13a and 13b in one end part 12a of the metallic belt-like body 12. The metallic belt-like body 12 is composed of a deformable part 11 and a fastening part 10 fastening and fixing the one end part 12a and the other end part 12b. The deformable part 11 is constituted by arranging an elastic deforming part 16a and a plastic deforming part 17a in parallel in the width direction of the belt-like body. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a tightening band for tightening and fixing a member to be tightened, which is a component part of, for example, an automobile or various industrial machines, to a mating member with an annular band.

  For example, a dustproof bellows made of a flexible elastic material such as rubber or synthetic resin, a covering member such as a shaft coupling boot, or a tightening member such as a fluid supply hose, and a corresponding member such as a shaft, joint or pipe In order to fix to a member, a fastening band is used in which a member to be fastened mounted on the counterpart member is held by an annular belt and fixed by the action of the fastening force.

  Generally, as shown in FIGS. 6 (a) and 6 (b), the above-described tightening band has claws 3a and 3b formed at one end 2a of a metal strip 2 and holes 4a and 4b at the other end 2b. And the claws 3a, 3b and the holes 4a, 4b are engaged with each other in a state in which the diameter of the belt-like body 2 is reduced to an annular shape and both end portions 2a, 2b are overlapped with each other. The member is held in a tightened state. In addition to the holes 4a and 4b, claws 9a and 9b having a form as shown in FIG. 7A may be formed and engaged with the claws 3a and 3b.

  The claws 3a and 3b and the holes 4a and 4b formed at both end portions 2a and 2b of the belt-like body 2 are provided at two places in the circumferential direction. In addition, protrusions 5a and 5b are provided at both ends 2a and 2b, respectively, and the two protrusions 5a and 5b displaced in the circumferential direction are tightened so as to be close to each other by using a tool or the like. By applying force, the claws 3a and 3b are engaged with the holes 4a and 4b or the claws 9a and 9b.

  In the state where both ends 2a and 2b of the belt-like body 2 are superposed, a protrusion 5a is formed at the center in the width direction of the one end 2a located on the inner side, and the length formed on the other end 2b located on the outer side. By exposing the projection 5a of the one end portion 2a from the hole 4b, the projections 5a and 5b formed at both end portions 2a and 2b are arranged in an operable state.

  In this tightening band, in order to make the engagement state between the claws 3a and 3b and the holes 4a and 4b or the claws 9a and 9b not easily released, as shown in FIG. An engagement margin t in the circumferential direction between 3b and the holes 4a, 4b or the claws 9a, 9b is required. With such a structure, when the belt-like body 2 is tightened, the claws 3a and 3b are temporarily inserted into the holes 4a and 4b or in a state where the diameter of the belt-like body 2 is further reduced compared to the final tightening and holding state. They are inserted into the claws 9a and 9b and engaged with each other.

  Here, the tightening force generated in the final tightening and holding state of the tightening band is a factor that affects the fixing strength and sealing performance of the member to be tightened. In order to stably obtain a large tightening force in this tightening holding state, the strength of the protrusion on which the tightening operation force acts with a tool for tightening the tightening band is sufficient (it will not be damaged even if a large operation force is applied) In addition, it is necessary that the claw and hole or the claw and claw with which both ends of the belt-like body are engaged, and the peripheral portion thereof have sufficient rigidity with respect to the force acting in the circumferential direction.

  In addition, the manufacturing error of the part related to the outer diameter dimension of the tightening part in the tightened member and the inner diameter dimension during tightening in the tightening band is small (the tightening allowance to the tightened member by the tightening band in the tightening holding state is constant) ) Is also necessary. In terms of this, there is a variation in tightening margin due to a manufacturing error necessary for ensuring the ease or stability of manufacturing the tightening band and the tightened member in practice. In that case, the tightening band that is dimensioned to obtain the desired fixing strength and sealability should be the one with the largest allowance due to manufacturing error, whereas the allowance due to manufacturing error of each part is the smallest. When tightening, it is necessary to further reduce the diameter of the member to be tightened, or to adjust the length of the band-like body by extending the tightening band itself in the circumferential direction.

  In order to solve this problem, there is a structure as disclosed in Patent Document 1. In Patent Document 1, in the clamp band structure, a slot-shaped opening punched out from the clamp band is formed as a tolerance guarantee means for the entire tolerance range of the hose and nipple, and the side left on both sides of the slot-shaped opening One having a width and length such that the side band portion provides a tolerance guarantee with a specified clamping force is disclosed. That is, in this patent document 1, when a part of the belt-like body of the tightening band is subjected to a punching hole so as to be extended (plastically deformed) by the tightening force, there is a variation in the outer diameter of the tightening portion of the member to be tightened. However, the variation in tightening force can be suppressed.

  However, in the case of the tightening band as disclosed in Patent Document 1, the tensile strength of the portion subjected to the punching process is lowered. For this reason, before obtaining the required tightening force, the punched hole part may extend excessively, the elongation may concentrate on the weakest part, leading to breakage, or an expensive material with high tensile strength is required. There were problems in putting the tightening band into practical use.

Therefore, there is one in which an elastic deformation portion and a plastic deformation portion with respect to a force acting in the circumferential direction of the belt-like body are arranged in parallel in the width direction of the belt-like body (Patent Document 2). The thing of the said patent document 2 clamps and fixes the site | part comprised by an elastic deformation part and a plastic deformation part, the site | part comprised only by a plastic deformation part, and the one end part and other end part of a fastening band. The tightening portion is arranged in a row along the circumferential direction.
JP-A-8-170773 JP 2004-347060 A

  In the device described in Patent Document 2, it is possible to obtain a large tightening force while sufficiently providing a function of suppressing variation in the tightening force due to manufacturing errors of the tightened member and the tightening band, and fixing the tightened member. Strength and sealability can be improved. However, in such a case, the amount of deformation at the time of tightening is different between a portion constituted only by the plastic deformation portion and a portion constituted by the elastic deformation portion and the plastic deformation portion. For this reason, the pressure contact force (clamping force) to the member to be tightened is different between the part composed of the elastically deformable part and the plastically deformed part and the part composed only of the plastically deformed part. There is a problem that encapsulated grease or the like leaks due to variations in the above.

  In view of the above-described problems, the present invention can provide a large tightening force with a sufficient function of suppressing variations in tightening force due to manufacturing errors of the member to be tightened and the tightening band, and the fixing strength of the member to be tightened. The present invention also provides a practical tightening band that improves sealing and prevents grease or the like from leaking easily.

  The fastening band of the present invention has a claw formed at one end of a metal strip and a hole or a claw formed at the other end, and the strip is reduced in an annular shape by applying a tightening operation force to both ends thereof. A fastening band for fastening and fixing a member to be fastened to a mating member by engaging the claw and the hole or the claw and the claw in a state where the portions are superposed, wherein the metal strip acts in a circumferential direction A deformable portion that deforms with respect to the force to be applied, and a tightening portion that fastens and fixes one end and the other end, and the deformable portion is elastically deformed with respect to the force acting in the circumferential direction of the belt-like body. An elastically deforming portion that performs plastic deformation and a plastically deformable portion that undergoes plastic deformation are arranged in parallel in the width direction of the belt-like body.

  In the tightening band of the present invention, the metal strip is composed of a deformable portion that is deformed by a force acting in the circumferential direction, and a tightening portion that fastens and fixes one end and both ends. When the metal strip is formed into an annular shape, the same structure is formed along the circumferential direction. Thereby, the internal pressure with respect to the to-be-tightened member at the time of fastening can be made substantially uniform on the circumference. Furthermore, since the deformable portion is arranged in parallel with the elastically deformable portion and the plastic deformable portion, the rigidity against the force in the circumferential direction becomes larger than when the deformable portion is constituted only by the elastically deformable portion. Further, when a tensile force is applied to the plastic deformable portion, the plastic deformable portion is stretched while the stress is evenly distributed, as compared to the case where the deformable portion is constituted only by the plastic deformable portion.

  The deformable portion can be continuously provided in the circumferential direction except for the tightening portions at both ends of the metal strip. Thereby, when making a metal strip into an annular shape, the entire structure is substantially the same along the circumferential direction.

  The deformable portion can be composed of two rows of elastically deformable portions in the width direction of the belt-like body and one row of plastically deformable portions interposed between the elastically deformable portions. Further, the deformable portion may be constituted by two rows of plastic deformation portions in the width direction of the belt-like body and one row of elastic deformation portions interposed between the plastic deformation portions. Furthermore, it is also possible to provide an elastic deformation part and a plastic deformation part in a line in the width direction of the strip.

  The tightening band of the present invention is applicable when the mating member is a universal joint and the member to be tightened is a boot attached to the end of the universal joint.

  According to the present invention, since the internal pressure at the time of tightening can be made substantially uniform on the circumference, there are no locations where the internal pressure is low, and contents can be prevented from leaking. By arranging the elastically deforming part and the plastically deforming part in parallel, the rigidity against the force in the circumferential direction is greater than when only the elastically deforming part is used, and the tightening allowance due to the manufacturing error of the tightened member and the tightening band is increased. A function to suppress the variation in the width is exhibited, and a high tightening force can be obtained. In addition, when a tensile force is applied to the plastic deformed portion, the plastic deformed portion is stretched while the stress is evenly distributed, so that the elongation until breakage is lengthened. be able to. For this reason, it is possible to obtain a large tightening force with sufficient functions to suppress variations in tightening force due to manufacturing errors of the member to be tightened and the tightening band, and to improve the fixing strength and sealing performance of the member to be tightened. The band can be easily put to practical use.

  The deformable portion may be composed of two rows of elastic deformation portions and one row of plastic deformation portions, or may be composed of two rows of plastic deformation portions and one row of elastic deformation portions, or the elastic deformation portion and plastic deformation. By providing the portions one by one, the size and strength of the tightening band can be changed according to the size and strength of the member to be tightened and the counterpart member.

  When the mating member is a universal joint, when tightening the boot to the end of the universal joint, a high tightening force can be obtained, the elongation to break can be lengthened, and the internal pressure during tightening can be increased on the circumference. It can be made almost uniform. For this reason, it can prevent that grease etc. leak from the inside.

  Embodiments of the fastening band according to the present invention will be described in detail below. The present invention relates to an embodiment in which a universal joint of an automobile is used as a counterpart member, a boot attached to the end of the universal joint is used as a tightened member, and the boot is fastened and fixed to the end of the universal joint with a fastening band, As an embodiment, for example, a covering member such as a dustproof bellows made of a flexible elastic body such as rubber or synthetic resin, or a member to be tightened such as a fluid supply hose is fixed to a corresponding member such as a shaft or a pipe. It is also applicable to

  FIGS. 1 to 5 show the first to fifth embodiments, in which FIGS. 1 (a) is a front view of a tightening band, (b) is a side view of (a), and (c) is an enlarged perspective view of (a). It is. The tightening band of each of the first to fifth embodiments has claws 13a and 13b formed at one end 12a of a metal strip 12 and holes 14a and 14b formed at the other end 12b. By engaging the claws 13a and 13b with the holes 14a and 14b in a state where the diameter of the ring 12 is reduced in an annular shape and the both ends 12a and 12b are superposed, the member to be tightened is held in a tightened state with the counterpart member.

  The holes 14a and 14b have the same form as the holes 4a and 4b shown in FIG. 6, and, in addition to the holes 14a and 14b, the claws 19a and 19b having the same form as the claws 9a and 9b shown in FIG. 7A are formed. The claws 13a and 13b are engaged with each other, or the claws 3a and 3b and the claws 9a and 9b shown in FIG. You may let them.

  The claws 13a and 13b and the holes 14a and 14b formed at both end portions 12a and 12b of the belt-like body 12 are provided at two locations in the circumferential direction. Further, projections 15a and 15b are respectively provided on the overlapped both ends 12a and 12b, and the two projections 15a and 15b displaced in the circumferential direction are tightened so as to be close to each other by using a tool or the like. By applying force, the claws 13a and 13b are engaged with the holes 14a and 14b or the claws 19a and 19b.

  In the state where both end portions 12a and 12b of the belt-like body 12 are superposed, a protrusion 15a is formed at the central portion in the width direction of the one end portion 12a located on the inner side, and the length formed on the other end portion 12b located on the outer side. By exposing the projection 15b of the one end 12a from the hole 14b, the projections 15a and 15b formed on the both ends 12a and 12b are arranged in an operable state.

  As the structure having the same function as the protrusions 15a and 15b and the form of the tip portion of a tool or the like for performing a tightening operation, the protrusions 15c and 15d shown in FIG. 8 and the operation portions 18c and 18d, and the protrusions 15e and 15f shown in FIG. And tip portions 18e and 18f, holes 15g and 15h and operation portions 18g and 18h shown in FIG. 10 are shown as examples.

  Similarly to the protrusion 15b, the protrusions 15d and 15f are formed in the center portion in the width direction of the one end portion 12a located on the inner side, and are exposed from a long hole-like hole 14b formed in the other end portion 12b located on the outer side. It has become. When the projections 15a, 15c, and 15e are positioned at the outermost end portion of the other end portion 12b and the other end portion 12b does not exist around the outside of the projections 15b, 15d, and 15f, the projections 15b, 15d, and 15f are It is exposed and the form exposed from the long hole 14b is not necessary.

  Further, the hole 15h is formed in the center portion in the width direction of the one end portion 12a located on the inner side, and a tip portion such as a tool is inserted from the long hole-like hole 14b formed in the other end portion 12b located on the outer side, In this embodiment, the tip protrusion 18k having a shape suitable for the hole 15h is engaged, and the fastening operation is performed together with the hole 15g in which the tip protrusion 18j is similarly engaged. When the hole 15h is located at the outermost end of the other end 12b and the other end 12b does not exist around the outer side of the hole 15g, the hole 15g is exposed, and a tool or the like is exposed from the long hole 14b. A form for inserting the tip portion is not necessary.

  First, in the fastening band of the first embodiment, as shown in FIGS. 1A to 1C, the metal strip is deformable with respect to the force acting in the circumferential direction; The fastening portion 10 is configured to fasten and fix the one end portion 12a and the other end portion 12b. The deformable portion 11 is continuously provided in the circumferential direction except for the fastening portion 10 of the metal strip 12. The deformable portion 11 is configured by arranging an elastic deformation portion 16a and a plastic deformation portion 17a with respect to a force acting in the circumferential direction of the belt-like body 12 in parallel in the width direction of the belt-like body. The elastic deformation portion 16a has a shape in which both sides of the belt-like body 12 are cut and raised in a wave shape by pressing along the circumferential direction. On the other hand, the plastic deformation portion 17a has a shape that remains in one row between the two rows of elastic deformation portions 16a by forming the two rows of elastic deformation portions 16a as described above.

  The deformable portion 11 of the tightening band of the second embodiment has a structure in which one row of elastic deformation portions 16b and two rows of plastic deformation portions 17b are arranged in parallel as shown in FIGS. is there. The elastic deformation part 16b has a shape obtained by cutting and raising the central part of the belt-like body 12 into a lump shape by pressing along the circumferential direction. On the other hand, the plastic deformation portion 17b has a shape that remains in two rows on both sides of the one row of elastic deformation portions 16b by forming the one row of elastic deformation portions 16b as described above.

  The deformable portion 11 of the tightening band of the third embodiment has a structure in which one row of elastic deformation portions 16c and one row of plastic deformation portions 17c are arranged in parallel as shown in FIGS. 3 (a) to 3 (c). . The elastic deformation portion 16c has the same shape as that of the second embodiment, that is, a shape obtained by cutting and raising one side in the width direction of the belt-like body 12 into a lump shape by pressing along the circumferential direction. On the other hand, the plastic deformation portion 17c has a shape that remains in one row on one side of the one row of elastic deformation portions 16c by forming the one row of elastic deformation portions 16c as described above.

  As in the case of the first embodiment, the deformable portion 11 of the tightening band of the fourth embodiment has two rows of elastic deformation portions 16d and one row of plastic deformation as shown in FIGS. 4 (a) to 4 (c). In this structure, the portions 17d are arranged in parallel. The elastic deformation portion 16d has a shape in which both sides of the belt-like body 12 are formed in a sawtooth shape by pressing along the circumferential direction. On the other hand, the plastic deformation portion 17d has a shape that remains in one row between the two rows of elastic deformation portions 16d by forming the two rows of elastic deformation portions 16d as described above.

  As in the case of the second embodiment, the deformable portion 11 of the tightening band of the fifth embodiment has one row of elastic deformation portions 16e and two rows of plastic deformation as shown in FIGS. In this structure, the portions 17e are arranged in parallel. The elastic deformation portion 16e has a shape in which the central portion of the strip 12 is formed into a pyramid shape by pressing along the circumferential direction. On the other hand, the plastic deformation portion 17e has a shape that remains in two rows on both sides of the one row of elastic deformation portions 16e by forming the one row of elastic deformation portions 16e as described above. If necessary, slits 20 arranged in the circumferential direction as shown in FIGS. 5D and 5E may be provided in the elastic deformation portion 16e.

  When assembling the tightening band, a tightening operation force is applied so that the two protrusions 15a and 15b of the both ends 12a and 12b of the overlapped strip 12 are brought close to each other in the circumferential direction by using a tool or the like. In the state where the band-shaped body 12 is further reduced in diameter than the final tightening and holding state, the claws 13a and 13b are inserted into the holes 14a and 14b to engage the claws 13a and 13b. Are engaged with the claws 19a and 19b.

  The plastic deformation portions 17a to 17e are stretched in the circumferential direction to the plastic deformation region within a range where they do not break, and the elastic deformation portions 16a to 16e arranged in parallel are also stretched by the same amount by the tightening operation force that is applied when the tightening band is assembled. It becomes a state. At this time, the contraction force generated in the elastically deformable portions 16a to 16e is determined by the structure and dimensions and material characteristics. The spring constant of the portion configured as the elastically deforming portions 16a to 16e as in the above-described embodiment is considerably smaller than the rigidity of the plastic deforming portions 17a to 17e.

  Thereby, the rigidity with respect to the force in the circumferential direction becomes larger than the case where only the elastically deforming portions 16a to 16e are configured, and the function of suppressing the variation in the tightening margin due to the manufacturing error of the tightened member and the tightening band is exhibited. High clamping force can be obtained.

  Also, in the case of only plastic deformation parts such as punched holes, when tensile force acts on the plastic deformation part, the elongation concentrates on the weakest part caused by material defects and shape factors, and the small elongation allowance Breaks. However, in the above-described embodiment, when the plastic deformation portions 17a to 17e of a certain portion are extended more than the other portions, the elastic deformation portions 16a to 16e arranged in parallel are also extended, and the rigidity of the portion is different. Therefore, the growth does not concentrate on the specific weakest part. That is, since the plastic deformation portions 17a to 17e are stretched while the stress is uniformly dispersed, the elongation until breakage can be made longer than the structure in which only the plastic deformation portion is provided.

  Thus, in the tightening band of the present invention, the internal pressure at the time of tightening can be made substantially uniform on the circumference, so that there are no locations where the internal pressure is low, and the contents can be prevented from leaking. By arranging the elastically deforming part 16 and the plastically deforming part 17 in parallel, the rigidity with respect to the force in the circumferential direction becomes larger than when only the elastically deforming part 16 is configured, and manufacturing errors of the tightened member and the tightening band are increased. A function that suppresses variation in the tightening allowance due to, and a high tightening force can be obtained. In addition, when a tensile force is applied to the plastic deformation portion 17, the plastic deformation portion 17 is stretched while the stress is uniformly distributed, so that the elongation until the fracture occurs. Can be lengthened. For this reason, it is possible to obtain a large tightening force with sufficient functions to suppress variations in tightening force due to manufacturing errors of the member to be tightened and the tightening band, and to improve the fixing strength and sealing performance of the member to be tightened. The band can be easily put to practical use.

  The deformable portion 11 is composed of two rows of elastic deformation portions 16 and one row of plastic deformation portions 17, or is composed of two rows of plastic deformation portions 17 and one row of elastic deformation portions 16. By providing the deformable portion 16 and the plastic deformable portion 17 one by one, the size and strength of the tightening band can be changed according to the size and strength of the member to be tightened and the counterpart member.

  When the mating member is a universal joint, when tightening the boot to the end of the universal joint, a high tightening force can be obtained, the elongation to break can be lengthened, and the internal pressure during tightening can be increased on the circumference. It can be made almost uniform. For this reason, it can prevent that grease etc. leak from the inside.

  As described above, the embodiment of the present invention has been described. However, the present invention is not limited to the above-described embodiment, and various modifications are possible. For example, the circumferential length of the belt-like body 2 is the circumferential direction of the counterpart member. Increase or decrease may be changed according to the length. The number of rows of the elastically deformable portions 16 and the plastically deformable portions 17 can be increased or decreased according to the material of the member to be tightened.

(A) is a front view which shows the clamp | tightening band in 1st Embodiment, (b) is a side view of (a), (c) is a principal part expansion perspective view of (a). (A) is a front view which shows the clamp | tightening band in 2nd Embodiment, (b) is a side view of (a), (c) is a principal part expansion perspective view of (a). (A) is a front view which shows the clamp | tightening band in 3rd Embodiment, (b) is a side view of (a), (c) is a principal part expansion perspective view of (a). (A) is a front view which shows the clamp | tightening band in 4th Embodiment, (b) is a side view of (a), (c) is a principal part expansion perspective view of (a). (A) is a front view showing a tightening band in the fifth embodiment, (b) is a side view of (a), (c) is an enlarged perspective view of a main part of (a), and (d) is a side view of (b). The figure which provided the slit, (e) is the figure which provided the slit of (c). (A) is a front view showing a general tightening band, (b) is a side view of (a), and (c) is an enlarged cross-sectional view of a main part of (a). (A) (b) is a figure which shows the engagement system by the nail | claw of the overlap part of a band end. It is a figure which shows the processus | protrusion for clamping operation, and tip forms, such as a tool. It is a figure which shows the processus | protrusion for clamping operation, and tip forms, such as a tool. It is a figure which shows the processus | protrusion for clamping operation, and tip forms, such as a tool.

Explanation of symbols

2a, 2b Both ends 3a, 3b Claw 4a, 4b Hole 5a, 5b Projection 9a, 9b Claw 10 Deformable part 11 Tightening part 12a, 12b Band 13a, 13b Claw 14a, 14b Hole 15a-15h Projection or hole for fastening operation 16a to 16e Elastic deformation portion 17a to 17e Plastic deformation portion 18c to 18h Tip portions 19a, 19b of a tool for performing a tightening operation

Claims (6)

A claw is formed at one end of the metal strip and a hole or a claw is formed at the other end, and the strip is reduced in an annular shape by applying a tightening operation force so that both ends are polymerized. A fastening band for fastening and fixing a member to be fastened to a mating member by engaging the claw and hole or the claw and claw,
The metal strip is composed of a deformable portion that is deformed with respect to a force acting in the circumferential direction, and a tightening portion that fastens and fixes one end and the other end. A fastening band comprising: an elastically deformable portion that is elastically deformed with respect to a force acting in a circumferential direction; and a plastically deformable portion that is plastically deformed and arranged in parallel in the width direction of the belt-like body.   2. The fastening band according to claim 1, wherein the deformable portion is provided continuously in the circumferential direction except for the fastening portions at both ends of the metal strip.   The fastening band according to claim 1 or 2, wherein the deformable portion includes two rows of elastically deformable portions in the width direction of the belt-like body and one row of plastically deformable portions interposed between the elastically deformable portions. .   The fastening band according to claim 1 or 2, wherein the deformable portion includes two rows of plastic deformation portions in the width direction of the belt-like body and one row of elastic deformation portions interposed between the plastic deformation portions. .   The fastening band according to claim 1 or 2, wherein the deformable portion is provided with an elastic deformation portion and a plastic deformation portion in a row in the width direction of the belt-like body.   The fastening band according to any one of claims 1 to 5, wherein the counterpart member is a universal joint, and the member to be fastened is a boot attached to an end of the universal joint.

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