JP2017003069A - Boot band for constant velocity universal joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a boot band for a constant velocity universal joint which can improve fastening workability by preventing a float of a region in which an engagement hole is formed.SOLUTION: This boot band 10 for a constant velocity universal joint has engagement holes 31, 32 and a first tool claw 41 in a one-end side region 21 of a band-shaped plate member 20, and the engagement holes 31, 32 having engagement claws 33, 34 which are fit into the engagement holes 31, 32, and a second tool claw 42 at the other end side region 22 of the band-shaped member are formed at one end side of the band-shaped plate member 20 rather than the first tool claw 41, and the engagement claws 33, 34 are arranged at a center side of the band-shaped plate member 20 rather than the second tool claw 42. A guide face 24 which abuts on the outside of the one-end side region 21 when the one-end side region 21 and the other end side region 22 are overlapped on each other, and can guide the one-end side region 21 to a longitudinal direction of the band-shaped plate member 20 is formed at the other end side region 22.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a boot band for a constant velocity universal joint.

  For example, there are two types of constant velocity universal joints that are used as means for transmitting a rotational force from an automobile engine to wheels at a constant velocity: a fixed constant velocity universal joint and a sliding constant velocity universal joint. These two types of constant velocity universal joints have a structure in which two shafts on the driving side and the driven side are connected and the rotational torque can be transmitted at a constant speed regardless of the operating angle of the two shafts.

  Since the drive shaft that transmits power from the engine of the automobile to the driving wheel needs to correspond to the angular displacement and axial displacement due to the change in the relative positional relationship between the engine and the wheel, the engine side (inboard side) ) And a fixed constant velocity universal joint on the drive wheel side (outboard side), and both constant velocity universal joints are connected by an intermediate shaft.

  These sliding constant velocity universal joints and fixed type constant velocity universal joints are designed to prevent the leakage of grease and other lubricants sealed inside the joint and prevent foreign matter from entering from the outside of the joint. A boot is mounted between the joint member and the intermediate shaft. This type of boot is fixed by tightening the outer joint member and the intermediate shaft using a metal boot band. At this time, a metal boot band having a clamp structure as described in Patent Document 1, for example, is conceivable.

Japanese Patent Publication No. 8-30484

  16 and 17 are a plan view and a side view of the boot band 110 to which the clamp structure described in Patent Document 1 is applied. As shown in FIGS. 16 and 17, the boot band 110 is provided with engagement holes 131 and 132 and a first tool claw 141 in one end region 121 in the longitudinal direction of the band plate-like member 120 constituting the band main body. The engagement claw 133, 134 and the second tool claw 142 are provided in the other end side region 122 in the longitudinal direction of the band plate member 120.

  The boot band 110 can fix a boot (not shown) to an outer joint member or the like in the manner shown in FIGS. 18 and 19, for example. That is, first, as shown in FIG. 18, the boot band 110 is wound around a boot (not shown), and the one end side region 121 and the other end side region 122 of the band plate member 120 are overlapped. Then, from this state, as shown in FIG. 19, the first tool claw 141 and the second tool claw 142 are forcibly brought close to each other with a tool (not shown), and the engagement claws 133 and 134 are engaged. The engagement claws 133 and 134 are engaged with the peripheral edges of the corresponding engagement holes 131 and 132 by being fitted into the joint holes 131 and 132. As a result, the boot is fastened and fixed to the outer joint member and the intermediate shaft by the boot band 110. At this time, for example, the engagement claws 133 and 134 can interfere with the one end side region 121 (over the one end side region 121) before reaching the position where the engagement holes 131 and 132 overlap. The engagement holes 131 and 132 are provided on one end side in the longitudinal direction of the band plate-like member 120 with respect to the first tool pawl 141 for the purpose of making it as small as possible, and engage with the engagement holes 131 and 132. The claws 133 and 134 are provided closer to the center side in the longitudinal direction of the strip plate member 120 than the second tool claws 142.

  By the way, in the boot band 110 having the structure shown in FIGS. 16 and 17, the engagement holes 131 and 132 are located on one end side of the band plate member 120 with respect to the first tool claw 141. Therefore, when the 1st tool nail | claw 141 and the 2nd tool nail | claw 142 are adjoined and both the tool nail | claws 141 and 142 were fitted together, the one end side of the strip | belt-plate-shaped member 120 located relatively outside The region 121 tends to be lifted from the other end side region 122 provided with the engaging claws 133 and 134 (see FIG. 20). Therefore, it is necessary to fit the engagement claws 133 and 134 into the engagement holes 131 and 132 by pushing the one end side region 121 inward (inner diameter side) by the operator's hand from this state. In this case, it is difficult to automatically perform the tightening operation of the boot band 110, and as a result of an increase in the step of manually pushing the one end side region 121 inward, the tightening workability is reduced.

  In view of the above circumstances, the present invention provides a boot band for a constant velocity universal joint that can prevent lifting of a region provided with an engagement hole and improve tightening workability. As an objective.

  The solution to the above problem is achieved by the boot band for a constant velocity universal joint according to the present invention. That is, this boot band is provided with an engagement hole and a first tool claw in one end side region of the band plate member, and is fitted into the engagement hole in the other end side region of the band plate member. An engagement claw and a second tool claw are provided, and a belt-like member is wound around the outer periphery of the boot, and the one end side region and the other end side region are overlapped so that the other end side region is inside. In addition, a constant velocity universal joint that allows the boot to be fastened to the constant velocity universal joint by bringing the first tool claw and the second tool claw close to each other and engaging the engagement claw with the peripheral edge of the engagement hole. The engagement hole is provided on one end side of the strip plate member with respect to the first tool pawl, and the engagement pawl is provided on the center side of the strip plate member with respect to the second tool pawl. In the other end side region, when the one end side region and the other end side region are overlapped, the one end side region comes into contact with the outside of the one end side region and the end plate side member It characterized with a point guide surface that allows guiding the longitudinal direction is provided.

  In the boot band for a constant velocity universal joint according to the present invention, the engagement hole is provided on one end side of the strip plate member with respect to the first tool pawl, and the engagement pawl is formed on the strip plate member with respect to the second tool pawl. When provided on the center side, when the one end side region and the other end side region are overlapped with the other end side region of the band plate member, the one end side region is in contact with the outside of the one end side region. A guide surface capable of guiding in the longitudinal direction of the member is provided. By providing the guide surface having the above-described configuration, one end side region of the band plate-like member in which the engagement hole is provided can be brought into contact with the guide surface on the outside before the engagement hole and the engagement claw are overlapped. . The one end side region in contact with the guide surface is guided in the longitudinal direction of the band plate-like member while further displacement to the outside is restricted by the guide surface. Further, in this case, since the band plate-like member has a shape curved in a ring shape by being wound around the outer periphery of the boot, the one end side region of the band plate-like member also tends to be bent in a substantially arc shape. Therefore, when both tool claws are brought close to each other, it is also possible to expect an effect that the tip is sent inward as the contact portion with the guide surface in the one end side region moves to the center side in the longitudinal direction. Accordingly, it is possible to suppress the lifting of the one end side region in a state where the engaging hole and the engaging claw overlap with each other as much as possible and to omit or minimize the pressing to the inside of the one end side region. .

  In addition, the boot band for a constant velocity universal joint according to the present invention is provided with an extension formed by extending the band plate-like member on one end side of the band plate-like member with respect to the engagement hole. A guide surface is provided on the center side of the plate-like member, so that when the one end side region and the other end side region are overlapped with each other, the guide surface abuts the outside of the extension portion and the extension portion becomes a strip plate shape. It may be possible to guide in the longitudinal direction of the member.

  Thus, by providing an extension in the one end side region of the band plate-like member, when the one end side region and the other end side region of the band plate member are overlapped, the band plate-like member is positioned more than the engagement hole. On one end side, the one end side region (extension part thereof) and the guide surface abut. Therefore, when both tool claws are brought close to each other, as the contact portion (extension portion) with the guide surface in the one end side region moves to the center side in the longitudinal direction, the tip is sent inward and the extension portion Cause bending deformation in sequence. Thereby, the site | part in which the engagement hole was provided among the one end side areas is pressed inside along the extension part. Therefore, when the engagement hole and the engagement claw are overlapped, the engagement claw can be automatically fitted into the engagement hole.

  Further, when the belt plate member is provided with an extension portion, the constant velocity universal boot band according to the present invention has a shape in which the tip of the extension portion is curved or bent in a direction opposite to the protruding direction of the engaging claw. It may be an eggplant.

  Thus, by making the tip of the extension part curved or bent, when the tip of the extension part first contacts the guide surface, the tip of the extension part is fed from the guide surface toward the other end side region. It becomes easy. Therefore, the extension portion can be stably curved toward the other end side region.

  Moreover, when an extension part is provided in a strip | belt-plate-shaped member, the boot band for constant velocity universal joints which concern on this invention may make the width direction dimension of the extension part smaller than a strip | belt-plate-shaped member main body.

  Thus, the bending rigidity can be reduced by forming the extension portion narrowly. Therefore, when it comes into contact with the guide surface, the extension portion can be bent more reliably toward the other end side region, and the pressing action to the engaging claw of the portion provided with the engaging hole in the one end side region can be performed. It becomes possible to raise more.

  In the boot band for a constant velocity universal joint according to the present invention, when the one end side region and the other end side region of the strip plate member overlap each other, the guide surface can be bent along with the deformation of the strip plate member. It may be a structure.

  In this way, by making the guide surface (the element having) bendable with the deformation of the strip plate member, the longitudinal direction of the strip plate member is caused by the guide surface whose one end region (or its extension) is curved. As well as being guided inside it. Therefore, the one end side region (or its extension) can be more effectively curved toward the other end side region, whereby the other end side region (engagement claw) of the portion where the engagement hole is further provided. ) Can be easily and reliably performed.

  Moreover, the boot band for a constant velocity universal joint according to the present invention has one end of the band plate member together with the inner side surface of the side portion where the guide surface is erected from the band plate member in the same direction as the protruding direction of the engaging claw. An insertion hole through which the portion can be inserted may be formed.

  In this way, when the one end side region and the other end side region are overlapped by forming an insertion hole through which one end of the strip plate member can be inserted on a plurality of surfaces including the guide surface, The one end side region of the member can be reliably introduced toward the guide surface. Thereby, since the contact state between the guide surface and the one end side region (one end portion) is stabilized, the expected behavior (curving) with respect to the one end side region thereafter can be expected with a high probability.

  In the boot band for a constant velocity universal joint according to the present invention, the guide plate has one side portion erected from one side in the width direction of the strip plate member and the strip plate member from the upper end of the one side portion. A first guide portion integrally having a top portion extending toward the center in the width direction, the other side portion standing from the other side in the width direction of the band plate-like member, and the band plate from the upper end of the other side portion The second guide portion integrally having the top portion extending toward the center in the width direction of the shaped member may be provided alternately.

  As described above, by dividing the guide portion into a plurality (first guide portion, second guide portion), depending on the material, thickness, etc. of the band plate-like member, the portion provided with each guide portion in the other end region Can be easily bent (or bent between the guide portions). Therefore, the effect of easily winding the boot band for the constant velocity universal joint in a ring shape can be expected as compared with the case where one guide portion is formed larger in the longitudinal direction. Moreover, if it is set as the above-mentioned form, compared with the guide part of the structure shown, for example in FIG.

  Since the boot band which concerns on the above description has the outstanding workability | operativity with respect to a boot as above-mentioned, it can provide suitably as a constant velocity universal joint provided with this boot band, for example.

  As described above, according to the present invention, it is possible to provide a boot band for a constant velocity universal joint that can prevent lifting of a region provided with an engagement hole and improve tightening workability.

It is a front view of the constant velocity universal joint of the state which fastened and fixed the boot to the outer joint member and the rotating shaft with the boot band for constant velocity universal joints which concerns on one Embodiment of this invention. 1 is a plan view of a boot band for a constant velocity universal joint according to an embodiment of the present invention. FIG. 3 is a side view of the boot band shown in FIG. 2. It is AA sectional drawing of the boot band shown in FIG. It is a figure for demonstrating an example of the usage condition of the boot band shown in FIG. 2, and is a side view which shows the state before the fastening which overlap | superposed the one end side area | region and the other end side area | region of the strip | belt-plate-shaped member. It is a principal part enlarged side view of the boot band shown in FIG. FIG. 6 is a side view showing a state of the boot band after the first tool claw and the second tool claw are brought close to each other and tightened from the state shown in FIG. 5. It is a principal part enlarged side view of the boot band shown in FIG. It is a top view of the boot band for constant velocity universal joints concerning other embodiments of the present invention. FIG. 10 is a side view of the boot band shown in FIG. 9. It is BB sectional drawing of the boot band shown in FIG. It is a side view of the boot band for constant velocity universal joints which concern on other embodiment of this invention. It is a top view of the boot band for constant velocity universal joints concerning other embodiments of the present invention. FIG. 14 is a side view of the boot band shown in FIG. 13. It is a figure for demonstrating an example of the usage condition of the boot band shown in FIG. 13, and is a side view which shows the state before the clamp | tightening which piled up the one end side area | region and the other end side area | region of the strip | belt-plate-shaped member. It is a top view of the boot band for constant velocity universal joints which concerns on the technique relevant to this invention. FIG. 17 is a side view of the boot band shown in FIG. 16. It is a figure for demonstrating an example of the usage condition of the boot band shown in FIG. 16, and is a side view which shows the state before the clamp | tightening which piled up the one end side area | region and the other end side area | region of the strip | belt-plate-shaped member. FIG. 19 is a side view showing a state of the boot band after the first tool claw and the second tool claw are brought close to each other and tightened from the state shown in FIG. 18. It is a principal part enlarged side view of the boot band shown in FIG.

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

  As a constant velocity universal joint to which the boot band in the following embodiments is applied, it is incorporated in a drive shaft of an automobile, and the two shafts on the driving side and the driven side are connected and rotated at a constant speed regardless of the operating angle of the two shafts. The sliding type constant velocity universal joint provided with the structure which transmits torque is illustrated. The boot band according to the present invention can be applied to any type of sliding constant velocity universal joint, such as a single roller type or double roller type tripod type constant velocity universal joint, a double offset type constant velocity universal joint, A sliding type constant velocity universal joint such as a cross group type constant velocity universal joint can be given. Of course, the boot band according to the present invention is not limited to the sliding type, but can be applied to a fixed type constant velocity universal joint such as a Rzeppa type constant velocity universal joint or an undercut free type constant velocity universal joint.

  The constant velocity universal joint shown in FIG. 1 is a double roller type tripod type constant velocity universal joint, and includes an outer joint member 71, a tripod member 72, and a roller unit 73 as main parts.

  The outer joint member 71 has a cup shape having an opening 74 at one end, and a rotation shaft 75 (for example, a drive shaft) is integrally formed at the center of the bottom portion. Although not shown, three linear track grooves 76 extending in the axial direction are formed on the inner peripheral surface of the outer joint member 71 at equal intervals in the circumferential direction. Each track groove 76 has a pair of roller guide surfaces 77 facing each other on both inner walls thereof. The roller guide surface 77 has an arc-shaped cross section and extends linearly in the axial direction of the outer joint member 71.

  Although not shown, the tripod member 72 is integrally formed with three leg shafts 79 extending in the radial direction of the boss 78 at equal intervals in the circumferential direction (120 ° intervals) on the outer peripheral surface of the cylindrical boss 78. It is formed. The front end of the leg shaft 79 extends in the radial direction to the vicinity of the bottom of the track groove 76. A shaft end of a rotating shaft 80 (for example, a driven shaft) is connected to the shaft hole of the boss 78 by spline fitting, and is prevented from coming off from the tripod member 72 by an annular snap ring 81.

  A roller unit 73 is rotatably disposed between the roller guide surface 77 of the track groove 76 of the outer joint member 71 and the outer peripheral surface of the leg shaft 79. The roller unit 73 includes an outer roller 82, an inner roller 83 disposed on the inner side of the outer roller 82 and fitted onto the leg shaft 79, and needle rollers 84 interposed between the outer roller 82 and the inner roller 83. Yes.

  The outer circumferential surface of the outer roller 82 has an arcuate longitudinal cross section, and may contact the roller guide surface 77 at two locations by angular contact or contact at one location by circular contact. On the other hand, the inner peripheral surface of the inner roller 83 has a convex arc shape. A plurality of needle rollers 84 are disposed between the outer roller 82 and the inner roller 83 in a so-called single row full roller state without a cage.

  The leg shaft 79 has a straight shape perpendicular to the joint axis in the longitudinal section, contacts the inner peripheral surface of the inner roller 83 in the direction perpendicular to the joint axis in the transverse section (not shown), and the joint axis A gap 85 is formed between the inner circumferential surface of the inner roller 83 in the direction. The inner roller 83 and the needle roller 84 are prevented from being detached from the outer roller 82 by washers 86 and 87 fitted in an annular groove formed on the inner peripheral surface of the outer roller 82.

  In this constant velocity universal joint, the leg shaft 79 of the tripod member 72 and the roller guide surface 77 of the outer joint member 71 are engaged with each other in the biaxial rotation direction via the roller unit 73, so that the drive side moves to the driven side. Rotational torque is transmitted at a constant speed. Further, the roller unit 73 rolls on the roller guide surface 77 while rotating with respect to the leg shaft 79, so that relative axial displacement and angular displacement between the outer joint member 71 and the tripod member 72 are allowed. Is done.

  At this time, a gap 85 is formed between the leg shaft 79 and the inner roller 83 in the axial direction of the joint, and the leg shaft 79 can tilt with respect to the roller unit 73 that rolls on the roller guide surface 77. Therefore, even if the joint takes an operating angle, the roller unit 73 does not tilt with respect to the roller guide surface 77. In this way, the roller unit 73 and the roller guide surface 77 are not obliquely crossed with the inclination of the leg shaft 79, and the induced thrust and slide resistance are reduced.

  This constant velocity universal joint is made of rubber or resin between the outer joint member 71 and the rotating shaft 80 in order to prevent leakage of a lubricant such as grease enclosed in the joint and to prevent foreign matter from entering from the outside of the joint. It has a structure equipped with a bellows-shaped boot 88 made of metal. By encapsulating the lubricant in the inner space of the outer joint member 71 and the boot 88, the lubricity during the operation in which the rotation shaft 80 rotates with respect to the outer joint member 71 while taking an operating angle is ensured.

  The boot 88 has a large-diameter end 89 fastened and fixed to the outer peripheral surface of the outer joint member 71 by the constant velocity universal joint boot band 10, and a small-diameter end 90 is fixed to the outer peripheral surface of the rotary shaft 80. The band 10 is fastened and fixed. Sealing performance is secured by tightening and fixing the boot bands 10 and 10 for constant velocity universal joints.

  Since the constant velocity universal joint has a function of rotating while taking an operating angle, the boot 88 is made of rubber or resin having a bellows shape that can be expanded and contracted in order to ensure flexibility to follow its behavior. Is used. As the rubber material, chloroprene rubber or silicon rubber having a surface hardness of Hs50 or more and Hs70 or less is suitable. Moreover, as the resin material, a thermoplastic polyester elastomer or a composition containing a thermoplastic polyester elastomer having a surface hardness of HD38 or more and HD50 or less is suitable. In this embodiment, a boot 88 made of chloroprene rubber is used.

  The metal boot band 10 that fastens and fixes the above-described boot 88 to the outer joint member 71 and the rotary shaft 80 has the following structure.

  As shown in FIGS. 2 and 3, the boot band 10 for a constant velocity universal joint according to the present invention has two end regions 21 (the right region in FIG. 2) of a band plate-like member 20 constituting a band body. The two engagement holes 31 and 32 are provided in the other end side region 22 (left side region in FIG. 2) of the band plate-like member 20. Are provided with two engaging claws 33 and 34 and a second tool claw 42 respectively. In addition, the one end side region 21 of the strip plate member 20 is provided with an extension 23 that extends from one end portion 21a of the one end side region 21, and the other end side region 22 of the strip plate member 20 includes A guide portion 25 having a guide surface 24 is provided. In the present embodiment, a temporary fastening claw 51 and a protrusion 52 are provided between the engaging claws 33 and 34 and the second tool claw 42.

  The engaging claws 33, 34 and the first and second tool claws 41, 42 both protrude from the front and back surfaces 20 a of the band plate member 20. The front and back surfaces 20a indicate the surface (outside) of the constant velocity universal joint boot band 10 when the band plate member 20 is wound around the outer periphery of the boot 88 to be tightened.

  The two engagement holes 31 and 32 are provided on one end side (side closer to the one end portion 21a) of the band plate member 20 than the first tool claw 41, and the two engagement claws 33 and 34 are the second tool claw. It is provided on the center side of the strip plate member 20 relative to the claw 42 (the side closer to the one end portion 21a than the other end portion 22a).

  In the present embodiment, the engaging claws 33 and 34, both the tool claws 41 and 42, the extension portion 23, and the guide portion 25 are all provided integrally with the band plate member 20, for example, two The engaging claws 33 and 34 are formed by cutting and raising one end side of the other end side region 22 of the band plate member 20. The 1st tool nail | claw 41 is formed by raising the other end side peripheral part of the 1st engagement hole 31 which makes a long hole shape among the two engagement holes 31 and 32. As shown in FIG. The second tool claw 42 is formed in a semi-annular shape so as to straddle both sides in the width direction of the cut opening by raising the cut portion provided in the other end side region 22 of the band plate member 20. .

  The guide portion 25 is formed so as to straddle both sides in the width direction of the cut opening by raising the cut portion provided in the other end side region 22 of the band plate-like member 20. That is, as shown in FIG. 4, the guide portion 25 is positioned on both side portions 25 a and 25 a erected from both sides in the width direction of the cut opening of the band plate-like member 20, and at the upper ends of these both side portions 25 a and 25 a The top part 25b formed so as to straddle both the side parts 25a and 25a is formed. Therefore, in this case, an insertion hole 26 to be described later is formed by the guide surface 24 that is the inner side surface (lower surface) of the top portion 25b and the width direction inner side surfaces 25a1 and 25a1 of the both side portions 25a. The insertion hole 26 has a shape in which both sides in the longitudinal direction are opened. Moreover, in this embodiment, the top part 25b is longer in the longitudinal direction of the strip-like member 20 than each side part 25a, and has a shape extending from one side in the longitudinal direction of each side part 25a to one end side and the other end side, respectively. There is no. In addition, the guide portion 25 has the above-described shape, and in this embodiment, has a structure that can be bent along with the deformation of the band plate-like member 20.

  In this case, the guide surface 24 is provided in a direction facing the front and back surfaces 20 a of the strip plate member 20. Moreover, the guide surface 24 is flat in the state which developed the strip | belt-plate-shaped member 20 flatly, and the space | interval with the strip | belt-plate-shaped member 20 is constant (all refer FIG. 3).

  Further, the extension 23 is formed so that its width-direction dimension is smaller than the width-direction dimension of the strip plate member 20.

  Hereinafter, an example of the usage aspect of the boot band 10 for constant velocity universal joints which concerns on this invention is demonstrated with the effect | action.

  When tightening the boot 88, first, as shown in FIG. 5, the boot band 10 for the constant velocity universal joint is wound around the outer periphery of the boot 88 at a predetermined position (see FIG. 1) in a ring shape. At this time, the one end side region 21 and the other end side region 22 are overlapped so that the one end side region 21 of the band plate-like member 20 is located on the outer periphery of the other end side region 22. At this stage, the first tool pawl 41 and the second tool pawl 42 are separated from each other in the circumferential direction. In addition, the first engagement hole 31 and the first engagement claw 33 that fit into each other, and the second engagement hole 32 and the second engagement claw 34 are spaced apart in the circumferential direction.

  Then, from this state, the first tool claw 41 and the second tool claw 42 are forcibly brought close to each other with a tool (not shown), thereby providing the first claw 41 provided in the one end side region 21 of the band plate member 20. One engagement hole 31 and the first engagement claw 33 provided in the other end region 22 are overlapped, and the first engagement claw 33 is fitted into the first engagement hole 31 (FIG. 7). See). Similarly, the second engagement hole 32 provided in the one end side region 21 of the band plate member 20 and the second engagement claw 34 provided in the other end side region 22 are overlapped to form a second engagement. The second engagement claw 34 is fitted into the joint hole 32 (see FIG. 7). Thereafter, the proximity force to both the tool claws 41 and 42 is released, and the one end side region 21 of the band plate-like member 20 is relatively moved in a direction to cancel the overlap with the other end side region 22. The first engaging claw 33 is engaged with the peripheral edge portion 31a on one end side (side closer to the one end portion 21a) of the first engaging hole 31. Further, the second engaging claw 34 is locked to the peripheral edge portion 32 a on one end side of the second engaging hole 32. As a result, the boot 88 is fastened and fixed to the outer joint member 71 and the rotary shaft 80 by the boot band 10 for the constant velocity universal joint (see FIG. 1).

  When the boot 88 is tightened using the boot band 10 for a constant velocity universal joint as described above, one end side of the one end side region 21 of the band plate member 20 is located on one end side. A problem arises in the lifting of the site, that is, the site where the engagement holes 31 and 32 are provided. More specifically, when tightening work is performed with the constant velocity universal joint boot band 10 having the above-described configuration, the tightening force applied to the boot band 10 is directly the first tool pawl 41 and the second tool pawl 42. Is applied to both of the tool claws 41 and 42 as a force in a direction for forcibly approaching. Therefore, in the case of the boot band 110 having a clamp structure as shown in FIG. 16, no external force acts on a portion on the one end side of the first tool claw 41 in the one end side region 21 that is relatively outside. The part on the one end side of the first tool claw 41 is likely to be lifted from the other end side region 22 (a state indicated by a two-dot chain line in FIG. 8).

  On the other hand, in the boot band 10 for a constant velocity universal joint according to the present invention, since the guide surface 24 having the above-described configuration is provided in the other end side region 22 of the strip plate member 20, at least the engagement hole 31 is provided. 32 and the engaging claws 33 and 34 are overlapped with each other, the one end side region 21 of the band plate-like member 20 provided with the engaging holes 31 and 32 can be brought into contact with the guide surface 24 on the outer side (see FIG. 6). The one end side region 21 in contact with the guide surface 24 is guided in the longitudinal direction of the band plate-like member 20 while further displacement to the outside is restricted by the guide surface 24. Rather, since the belt-like member 20 is in a ring shape by being wound around the outer periphery of the boot 88, the one end side region 21 of the belt plate-like member 20 is also curved in a substantially arc shape. Therefore, when both the tool claws 41 and 42 are brought close to each other, the tip is guided inward as the contact portion with the guide surface 24 in the one end region 21 shifts to the center in the longitudinal direction. Can also be expected. Therefore, the lifting of the one end side region 21 in a state where the engaging holes 31 and 32 and the engaging claws 33 and 34 overlap with each other is suppressed as much as possible, and pressing inside the one end side region 21 is omitted or minimized. It becomes possible to keep it to the limit.

  In particular, in the present embodiment, an extension 23 formed by extending the strip plate member 20 is provided on one end side of the strip plate member 20 with respect to the engagement holes 31 and 32, and more than the engagement claws 33 and 34. A guide surface 24 (guide portion 25) is provided on the center side of the belt-like member 20, and the guide surface 24 is forcedly approached by a tool when the one end side region 21 and the other end side region 22 are overlapped. Before the force was applied to both tool claws 41 and 42, the extension portion 23 was able to be guided in the longitudinal direction of the strip plate member 20 by contacting the outside of the extension portion 23 (see FIG. 5). Thus, by providing the extension 23 and the guide surface 24, the extension 23 is brought into contact with the guide surface 24 easily and surely and deformed in the longitudinal direction of the belt-like member 20 in the longitudinal direction. I can guide you. Accordingly, it is possible to effectively enhance the pressing action on the inside of the one end side region 21.

  At this time, as shown in FIG. 4, the guide surface 24 and the inner side surfaces 25a1 and 25a1 of the side portions 25a and 25a erected from the strip plate member 20 form one end portion 21a of the strip plate member 20. By forming the insertion hole 26 that can be inserted, the one end side region 21 can be smoothly introduced toward the guide surface 24 when the one end side region 21 and the other end side region 22 are overlapped. Thereby, since the contact state of the guide surface 24 and the one end side area | region 21 (one end part 21a) is stabilized, the one end side area | region 21 can be curved and it can make it easier to press on the other end side area | region 22.

  Although one embodiment of the present invention has been described above, the boot band 10 for constant velocity universal joints can of course take other forms as long as it is within the scope of the present invention.

  For example, in the above embodiment, as the guide portion 25 having the guide surface 24, the top portion 25 b provided with the guide surface 24 as the lower surface has two side portions 25 a erected from both sides in the width direction of the strip plate member 20, Although the case where it formed so that it may straddle these side parts 25a and 25a at the upper end of 25a was demonstrated, of course, it is also possible for the guide part 25 (guide surface 24) to take another form. FIG. 9 and FIG. 10 show an example thereof, and the boot band 10 for a constant velocity universal joint shown in these drawings includes one side portion 27a erected from one side in the width direction of the band plate member 20, The first guide portion 27 integrally having a top portion 27b extending from the upper end of the side portion 27a toward the center in the width direction of the strip plate member 20 and the other side in the width direction of the strip plate member 20 are erected. One side portion 28a and second guide portions 28 integrally including a top portion 28b extending from the upper end of the side portion 28a toward the center in the width direction of the band plate member 20 are alternately provided (FIG. 11). See). In this case, the guide surface 24 is provided as an inner side surface (lower surface) of the top portion 27 b of the first guide portion 27 and an inner side surface of the top portion 28 b of the second guide portion 28. Therefore, the guide surface 24 is intermittently provided along the longitudinal direction of the strip plate member 20.

  As described above, by dividing the guide portion 25 into a plurality (first guide portion 27, second guide portion 28), depending on the material, thickness, etc. of the strip plate member 20, as shown in FIG. Rather than constituting 25, it is easier to bend (or bend between the guide portions 27, 28) the portion where the guide portions 27, 28 of the other end side region 22 are provided. Therefore, the effect of easily winding the constant velocity universal joint boot band 10 in a ring shape can be expected as compared with the case where one guide portion 25 is formed larger in the longitudinal direction as shown in FIG. Moreover, if it is set as the above-mentioned form, compared with the guide part 25 shown in FIG.

  Of course, the guide part 25 can also take forms other than the above. That is, as shown in FIG. 4 and FIG. 11, as long as the guide surface 24 provided on the guide portion 25 comes into contact with the outside of the one end side region 21, the structure of the guide portion 25 is as follows. As long as it is disposed so as to face the band plate-like member 20, the guide surface 24 and the guide portion 25 can take any form.

  Moreover, regarding the extension part 23, in the said embodiment, although what made the form extended in the same direction as the strip | belt-plate-shaped member 20 until it reached the one end part 21a was illustrated, of course, other forms can also be taken. is there. For example, as shown in FIG. 12, the distal end of the extension 23, that is, the one end 21a of the band plate member 20 is bent or bent in the direction opposite to the protruding direction of the engaging claws 33, 34, etc. It is also possible to do. According to this configuration, when the tip of the extension 23 first contacts the guide surface 24, the tip of the extension 23 can be easily bent from the guide surface 24 toward the other end side region 22. Therefore, the extension part 23 can be curved toward the other end side region 22 stably.

  Moreover, in the said embodiment, the guide part 25 (27, 28) was provided in the center side (side closer to the one end part 21a rather than the other end part 22a) rather than the engaging claws 33 and 34. Although the case has been described, of course it need not be limited to this position. For example, as shown in FIGS. 13 and 14, the guide portion 25 may be provided on the other end side of the band plate member 20 with respect to the engaging claws 33 and 34. In this case, when the constant velocity universal joint boot band 10 is wound in a ring shape and the superposition of the one end side region 21 and the other end side region 22 of the band plate member 20 is started, as shown in FIG. The outer side of the one end side region 21 contacts the guide surface 24. Therefore, it is possible to guide in the longitudinal direction while regulating the movement of the one end side region 21 to the outside at an early stage, and the tightening mode is stabilized.

  In the above embodiment, the guide surface 24 is higher than the engagement claws 33 and 34 and the second tool claw 42 (the distance between the guide surface 24 and the strip plate member 20 is the Although the case where it is larger than the protrusion height of the second tool claw 42 is illustrated, it is of course possible to adopt other dimensional relationships. When the boot band 10 for a constant velocity universal joint is tightened, the distance between the guide surface 24 and the strip plate member 20 (the guide surface) as long as the one end side region 21 of the strip plate member 20 can reasonably contact the guide surface 24. 24 height dimension) can be set to be equal to or less than the protruding height of the engaging claws 33, 34 and the second tool claw 42 from the front and back surfaces 20a.

  In the above embodiment, the case where the engaging claws 33 and 34, the tool claws 41 and 42, the guide portion 25, and the like are formed by deforming a part of the belt-like member 20 is illustrated. It is also possible to form these elements separately from the member 20 and then integrate them by attaching them to the belt-like member 20.

  Moreover, in the said embodiment, although the case where the two engagement claws 33 and 34 were provided in the strip | belt-plate-shaped member 20 was illustrated, sufficient locking force (tightening holding | maintenance) is sufficient only by the latching of one engagement claw 33 If the force) can be obtained, the two engaging claws 33 and 34 are not necessarily required. Similarly, if it is not necessary to fix the one end side region 21 and the other end side region 22 step by step (temporary fixing by the temporary fixing claw 51) during the tightening operation, the temporary fixing claw 51 can be omitted. is there.

  Further, in the above embodiment, the case where the guide hole 25 is provided with the insertion hole 26 having a shape opened on both sides in the longitudinal direction of the strip plate member 20 is illustrated, but the insertion hole 26 is one end of the strip plate member 20. The insertion start side of the part may be opened and the insertion end side may be closed.

DESCRIPTION OF SYMBOLS 10 Boot band 20 for constant velocity universal joints Band plate-shaped member 21 One end side area | region 21a One end part 22 Other end side area | region 22a Other end part 23 Extension part 24 Guide surface 25,27,28 Guide part 25a, 27a, 28a Side part 25a1 Width direction inner side surface 25b, 27b, 28b Top part 26 Insertion hole 31, 32 Engagement hole 31a, 32a Peripheral part 33, 34 Engagement claw 41, 42 Tool claw 51 Temporary fixation claw 52 Projection 71 Outer joint member 72 Tripod member 73 Roller unit 80 Rotating shaft 88 Boot 89 Large diameter end portion 90 Small diameter end portion 110 Boot band 120 Band plate member 121 One end side region 122 Other end side region 131, 132 Engaging hole 133, 134 Engaging claw 141, 142 Tool claw

Claims (8)

An engagement hole and a first tool claw are provided in one end side region of the band plate-like member, and an engagement claw and a first engagement portion fitted into the engagement hole in the other end side region of the band plate-like member. A second tool claw is provided, and the belt-like member is wound around the outer periphery of the boot, and the one end side region and the other end side region are overlapped so that the other end side region is inside. The boot can be fastened to the constant velocity universal joint by bringing the first tool claw and the second tool claw close to each other and engaging the engagement claw with the peripheral edge of the engagement hole. A boot band for a constant velocity universal joint,
The engagement hole is provided on one end side of the strip plate member than the first tool claw, and the engagement claw is provided on the center side of the strip plate member than the second tool claw,
In the other end side region, when the one end side region and the other end side region are overlapped, the one end side region is brought into contact with the outside of the one end side region in the longitudinal direction of the band plate member. A boot band for a constant velocity universal joint, characterized in that a guide surface that can be guided is provided.   An extension portion formed by extending the band plate-like member is provided on one end side of the band plate-like member with respect to the engagement hole, and the guide surface is closer to the center side of the band plate-like member than the engagement claw. Thus, when the one end side region and the other end side region overlap each other, the guide surface comes into contact with the outside of the extension portion and the extension portion becomes the longitudinal length of the strip plate member. The boot band for a constant velocity universal joint according to claim 1, wherein the boot band can be guided in a direction.   The boot band for a constant velocity universal joint according to claim 2, wherein a tip of the extension portion is curved or bent in a direction opposite to a protruding direction of the engagement claw.   4. The boot band for a constant velocity universal joint according to claim 2, wherein a dimension in a width direction of the extension portion is smaller than that of the band plate member main body.   5. The structure according to claim 1, wherein the guide surface has a structure that can be bent along with the deformation of the band plate member when the one end side region and the other end side region of the band plate member are overlapped. A boot band for a constant velocity universal joint according to claim 1.   The guide surface forms an insertion hole through which one end portion of the band plate-like member can be inserted together with an inner side surface of a side portion erected from the band plate-like member in the same direction as the protruding direction of the engaging claw. Item 6. The constant velocity universal joint boot band according to any one of Items 1 to 5.   The guide portion includes one side portion erected from one side in the width direction of the band plate-like member, and a top portion extending from the upper end of the one side portion toward the width direction center of the band plate-like member. A first guide part integrally formed, the other side part erected from the other side in the width direction of the band plate-like member, and the upper end of the other side part toward the center in the width direction of the band plate-like member The boot band for a constant velocity universal joint according to any one of claims 1 to 5, wherein a second guide portion integrally having a top portion extending in an extended manner is provided alternately.   The constant velocity universal joint provided with the boot band in any one of Claims 1-7.

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