JP2010084900A - Structure and method for mounting boot band - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a boot band mounting structure and mounting method simplifying structure after mounting boot bands to a boot, improving work efficiency in mounting the boot bands to the boot and improving sealing property of the boot. <P>SOLUTION: The boot band 20 is mounted and fixed into a boot fitting groove 24 of a large diameter end 17 of the boot 16, and the boot band 21 is mounted and fixed into a band fitting groove 25 of a small diameter end 18. The boot bands 20, 21 are inserted outside in contact with the boot ends 17, 18 by being fitted into the boot fitting grooves 24, 25 of the boot ends 17, 18, and then the boot bands 20, 21 are inserted in cylindrical heating media X and simultaneously heated at the same temperature for the same time in the entire circumferential length to reduce diameters. The axial length of the boot bands 20, 21 is made shorter than the axial length of the band fitting grooves 24, 25. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  [Technical Field] The present invention relates to a boot band mounting structure and mounting used in automobiles and various industrial machines and used for fastening and fixing a boot to be mounted on the constant velocity universal joint in a constant velocity universal joint that transmits rotational torque. It is about the method.

  Constant velocity universal joints are roughly classified into fixed type constant velocity universal joints that allow only angular displacement and sliding type constant velocity universal joints that allow angular displacement and axial displacement. Such a constant velocity universal joint is equipped with a boot in order to prevent foreign matter from entering the inside of the joint and leakage of the lubricating component sealed inside the joint to the outside. A boot band is used to attach the boot.

  FIG. 7 illustrates a constant velocity universal joint provided with a boot band. This constant velocity universal joint 101 is called a double offset type constant velocity universal joint (DOJ) which is one of sliding type constant velocity universal joints. The constant velocity universal joint 101 includes an outer ring 102 having an opening, an inner ring 103, a ball 104, and a cage 105 as main parts. Inside the outer ring 102, an internal part 106 composed of an inner ring 103, a ball 104, and a cage 105 is accommodated. The internal part 106 is prevented from coming out to the outside by a circlip 112 fitted in a concave groove 113 formed on the inner peripheral surface of the opening end 115 of the outer ring 102.

  A plurality of linear track grooves 107 are formed on the cylindrical inner peripheral surface of the outer ring 102, and a plurality of linear track grooves 108 are formed on the outer spherical surface of the inner ring 103. A ball 104 is interposed between the linear track groove 107 of the outer ring 102 and the linear track groove 108 of the inner ring 103, and this ball 104 is a pocket 114 of the cage 105 disposed between the outer ring 102 and the inner ring 103. Is held by.

  A center hole 110 is formed in the inner ring 103, and a shaft 109 extending to the outside of the joint is inserted into the center hole 110 and is spline-fitted. The shaft 109 is prevented from coming off from the center hole 110 of the inner ring 103 by a snap ring 111.

  The opening of the outer ring 102 is covered with a boot 116 made of CR (chloroprene). The boot 116 includes a large-diameter end portion 117, a small-diameter end portion 118, and a bellows portion 119 that connects the large-diameter end portion 117 and the small-diameter end portion 118. The large-diameter end portion 117 is attached to the outer peripheral surface 122 of the opening end portion 115 of the outer ring 102 and is fastened and fixed by an annular boot band 120. Further, the small diameter end portion 118 is attached to the outer peripheral surface 123 of the shaft 109 and is fastened and fixed by an annular boot band 121.

  As shown in FIG. 8, the boot band 120 includes an outer overlapping portion 151, an inner overlapping portion 152, and an intermediate portion 156, and has an annular shape in which the outer overlapping portion 151 is overlapped with the inner overlapping portion 152. The outer overlapping portion 151 has an ear portion 153, and the ear portion 153 includes a pair of leg portions 154 and a bridging portion 155 that couples the pair of leg portions 154 on the outer diameter side.

  After the boot band 120 is attached to the large-diameter end 117 (see FIG. 7) of the boot 116, the base of the leg 154 is tightened with a tightening tool (not shown) as indicated by the white arrow P in FIG. By caulking and making the state shown in FIG. 9, the diameter of the boot band 120 is reduced radially inward. For this reason, as shown in FIG. 7, the large-diameter end 117 of the boot 116 is fastened and fixed to the open end 115 of the outer ring 102, and the boot band 120 is attached and fixed to the large-diameter end 117 of the boot 116. The The boot band 121 has the same shape as the boot band 120. Therefore, when the boot band 121 is attached and fixed to the small diameter end portion 118 of the boot 116, the diameter of the boot band 121 is reduced after being attached to the small diameter end portion 118 of the boot 116 (see Patent Document 1). .

  Various types of boot bands other than those shown in FIGS. 7 to 9 are known as shapes, mounting structures, and mounting methods.

  For example, Patent Document 2 describes a boot band in which a lever is provided between an outer overlapping portion and an inner overlapping portion. This boot band tilts the lever, thereby reducing the diameter of the boot band and applying a tightening force to the boot.

Patent Document 3 describes a boot band that is formed endlessly and has a plurality of irregularities formed on its inner peripheral surface. The boot band is reduced in diameter by a caulking machine to apply a tightening force to the boot.
JP-A-2005-61586 JP 2006-161869 A JP 2006-105176 A

  Now, since the technique of patent document 1 shown in FIGS. 7-9 forms the ear | edge part 153 in the boot band 120, the shape of the boot band 120 becomes complicated. Further, since a tightening tool is required for caulking the ear portion 153, there is a problem in workability (ease of work, work efficiency) when reducing the diameter of the boot band 120. Furthermore, the attachment structure after attaching the boot band 120 to the large-diameter end portion 117 of the boot 116 becomes bulky by the ear portion 153. Since the boot band 121 has the same shape as the boot band 120, the attachment structure after the boot band 121 is attached to the small diameter end portion 118 of the boot 116 becomes bulky.

  In the technique described in Patent Document 2, since the lever is provided on the boot band, the shape of the boot band is complicated. In addition, the boot band is swaged by a tightening tool or a manual work. In any case, however, manpower is required, so that there is a problem in workability when the diameter of the boot band is reduced.

  Since the technique described in Patent Document 3 forms the boot band in an endless shape, the shape of the boot band and the attachment structure after the boot band is attached to the boot are simplified. However, since a caulking machine is required to reduce the diameter of the boot band, there is a problem in workability when the diameter of the boot band is reduced.

  The present invention has been made in view of the above circumstances, and can realize simplification of the structure after attachment to the boot and improvement in workability when attaching to the boot, and also improve the sealing performance of the boot. An object of the present invention is to provide a boot band mounting structure and mounting method that can be used.

  A boot band mounting structure according to the present invention for solving the above-described problems includes an end portion attached to an opening end portion of an outer joint member having an opening portion, and a shaft member extending from the inside of the outer joint member to the outside of the joint. And a boot band mounting structure in which the boot having the other end attached thereto is fastened and fixed by a boot band at the one end and the other end, wherein the boot band is formed into an endless heat. It is made of a shrinkable material and is attached and fixed to the boot end by a reduced diameter by heat treatment. The term “endless” as used herein means a shape having no connection end such as an overlapped end portion or a joined end portion.

  In this case, the boot band is an overlapped state (or joined state) of the connecting ends, like a conventional boot band having an annular connecting end by overlapping or connecting both ends of a plate-like boot band. ) Will not loosen and tightening force will not decrease. In addition, since the boot band does not require an annular work, the number of work steps required for manufacturing the constant velocity universal joint can be reduced.

  Furthermore, since it is not necessary to provide a structure for reducing the diameter of the boot band, the shape can be simplified. Thus, since the shape of the boot band can be simplified, the attachment structure when attached to the boot end portion does not become bulky and does not become complicated.

  The boot band can be mounted and fixed within the axial range of the boot end, and can also be mounted and fixed from the boot end to the outer joint member or the shaft member. In the latter case, since the boot band is attached and fixed not only to the boot end but also to the open end (or shaft member) of the outer joint member, the boot band performs a sealing function. Therefore, the sealing performance of the boot end portion is improved, and it is possible to efficiently prevent the lubricating component inside the outer joint member from leaking to the outside.

  As described above, when the boot band is attached and fixed from the boot end portion to the outer joint member (or shaft member), the boot band has a large-diameter portion extending in the axial direction, and a radially inner side from the large-diameter portion. And a small-diameter portion extending in the axial direction from the step portion, the large-diameter portion being attached and fixed to the boot end, and the small-diameter portion being attached to the opening end of the outer joint member or the shaft member It is preferable that the inner side surface of the stepped portion and the end surface of the boot end portion are in close contact with each other.

  In this case, since the inner side surface of the step portion of the boot band and the end surface of the boot end portion are in close contact with each other, no gap is generated between the boot band and the boot end portion. Therefore, the sealing function of the boot band is improved, and the sealing performance of the boot end is significantly improved. As a result, it is possible to reliably prevent the lubricating component inside the outer joint member from leaking to the outside.

  In order to solve the above-described problems, a boot band attaching method according to the present invention includes an end portion attached to an opening end portion of an outer joint member having an opening portion, and a shaft member extending from the inside of the outer joint member to the outside of the joint. A boot band having a second end attached to the first end and the other end by a boot band, wherein the boot band is formed endlessly from a heat-shrinkable material. Then, it is attached to and fixed to the boot end by extrapolating to the boot end and then reducing the diameter by heat treatment.

  In this case, the heat treatment is performed with a heating medium such as a dryer or a heater. Therefore, when applying a tightening force to the boot end by reducing the diameter of the boot band, a tightening tool is not required, and manual work is also unnecessary.

  In this boot mounting method, the boot band is extrapolated from the boot end to the opening end or the shaft member of the outer joint member, and then reduced in diameter by heat treatment, so that the outer joint member or It is desirable to mount and fix the shaft member.

  In this case, since the boot band is reduced in diameter by heat treatment and can be mounted and fixed from the boot end portion to the opening end portion (or shaft member) of the outer joint member, the boot band performs a sealing function, Sealability is improved. As a result, it is possible to efficiently prevent the lubricating component inside the outer joint member from leaking to the outside.

  As a specific example of the above-described method of attaching the boot band, the boot band has a cylindrical shape, one end portion is extrapolated in contact with the boot end portion, and the other end portion is protruded in the axial direction from the boot end portion. The outer end of the outer joint member or the shaft member is extrapolated in a state, and then the one end is attached and fixed to the boot end by heat treatment, and the other end is opened of the outer joint member. There is a method of attaching and fixing to the end portion or the shaft member.

  In the boot band mounting method already described, the boot band includes a large-diameter portion extending in the axial direction, a step portion extending radially inward from the large-diameter portion, and a small-diameter portion extending in the axial direction from the step portion. Then, by bringing the inner side surface of the stepped portion into contact with the end surface of the boot end portion, the large diameter portion is extrapolated in contact with the boot end portion, and the small diameter portion is opened to the open end portion of the outer joint member. Alternatively, by extrapolating the shaft member in a contact state and then reducing the diameter of the boot band by heat treatment, the large diameter portion is attached and fixed to the boot end portion, and the small diameter portion is opened to the open end portion of the outer joint member or It is desirable to fix it to the shaft member.

  In this case, the boot band is contracted by heat treatment while the inner surface of the boot end is in contact with the end surface of the boot end, so that the tightening force of the boot band against the outer joint member (or shaft member) is improved. To do. For this reason, the sealing function of a boot band improves and the sealing performance of a boot end part can be improved significantly. As a result, it is possible to reliably prevent the lubricating component inside the outer joint member from leaking to the outside.

  The heat treatment of the boot band is desirably performed uniformly over the entire length in the circumferential direction of the boot band. Examples of means for uniformly heat-treating the boot band over the entire length in the circumferential direction include a method in which the entire circumferential length is simultaneously heated at the same temperature for the same time. In this case, since the tightening force of the boot band is uniform over the entire length in the circumferential direction, the boot end can be uniformly tightened over the entire length in the circumferential direction. As a result, the mounting state of the boot end with respect to the opening end (or shaft member) of the outer joint member becomes stable and strong, so that the sealability of the boot end can be improved with certainty.

  The boot band mounting structure of the present invention has an endless boot band molded from a heat-shrinkable material mounted and fixed to the boot end with a reduced diameter by heat treatment. As in the case of a conventional boot band having an annular connecting end, the overlapping state (or joined state) of the connecting end is not loosened and the tightening force is not reduced. Therefore, it is possible to improve the sealing performance of the boot end by firmly tightening and fixing the boot end to the opening end (or shaft member) of the outer joint member. As a result, it is possible to reliably prevent a lubricating component such as grease from leaking from the inside of the constant velocity universal joint to the outside of the joint.

  Further, since the boot band does not require an annular work like a conventional boot band, it is possible to reduce the number of work steps necessary for manufacturing a constant velocity universal joint. For this reason, the cost and time required for manufacturing the constant velocity universal joint can be reduced.

  Furthermore, since it is not necessary to provide a structure for reducing the diameter of the boot band, the shape can be simplified. For this reason, workability (ease of processing, work efficiency at the time of processing) when processing the boot band is improved. As described above, since the boot band can be simplified in shape, the mounting structure does not become bulky and does not become complicated when the boot band is mounted on the boot end. As a result, it contributes to the compactness of the constant velocity universal joint.

  In the boot band mounting method of the present invention, the boot band is reduced in diameter by heat treatment with a heating medium such as a dryer or a heater, so that a tightening tool is not required and manual work is not required. As a result, workability when manufacturing a constant velocity universal joint can be improved.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. In the second and third embodiments shown in FIGS. 3 to 6, parts having the same portions and functions as those in the first embodiment shown in FIGS. 1 and 2 are denoted by the same reference numerals. Detailed description thereof will be omitted.

  1 and 2 show a first embodiment of the present invention. FIG. 1 shows the application of the present invention to a double offset type constant velocity universal joint (DOJ) which is one of sliding type constant velocity universal joints.

  The constant velocity universal joint 1 includes an outer ring (outer joint member) 2 having an opening, an inner ring (inner joint member) 3, a ball 4, and a cage 5 as main parts. Inside the outer ring 2, an internal part 6 composed of an inner ring 3, a ball 4, and a cage 5 is accommodated. The internal component 6 is prevented from coming out to the outside by a circlip 12 fitted in a concave groove 13 formed on the inner peripheral surface of the opening end 15 of the outer ring 2.

  A plurality of linear track grooves 7 are formed on the cylindrical inner peripheral surface of the outer ring 2, and a plurality of linear track grooves 8 are formed on the outer spherical surface of the inner ring 3. A ball 4 is interposed between the linear track groove 7 of the outer ring 2 and the linear track groove 8 of the inner ring 3, and this ball 4 is a pocket 14 of the cage 5 disposed between the outer ring 2 and the inner ring 3. Is held by.

  A center hole 10 is formed in the inner ring 3, and a shaft (shaft member) 9 extending to the outside of the joint is inserted into the center hole 10 and is spline-fitted. The shaft 9 is prevented from coming off from the center hole 10 of the inner ring 3 by a snap ring 11.

  The opening of the outer ring 2 is covered with a boot 16 made of CR (chloroprene). The boot 16 includes a large-diameter end portion 17, a small-diameter end portion 18, and a bellows portion 19 that connects the large-diameter end portion 17 and the small-diameter end portion 18.

  The large diameter end portion 17 is fitted in a fitting groove 22 formed in the outer peripheral surface 28 of the opening end portion 15 of the outer ring 2. A band fitting groove 24 is formed on the outer peripheral surface 26 of the large diameter end portion 17, and the cylindrical boot band 20 is attached and fixed to the band fitting groove 24 by fitting. By this boot band 20, the large-diameter end portion 17 is fastened and fixed to the outer peripheral surface 28 of the open end portion 15 of the outer ring 2.

  The small diameter end portion 18 is fitted in a fitting groove 23 formed on the outer peripheral surface 29 of the shaft 9. A band fitting groove 25 is formed on the outer peripheral surface 27 of the small diameter end 18, and a cylindrical boot band 21 is attached and fixed to the band fitting groove 25 by fitting. The small-diameter end 18 is fastened and fixed to the outer peripheral surface 29 of the shaft 9 by the boot band 21.

  The boot bands (20, 21) are formed endlessly from a heat-shrinkable material. The term “endless” as used herein means a shape having no connection end such as an overlapped end portion or a joined end portion. As the heat shrinkable material, for example, polyolefin can be used.

  As shown in FIG. 1, the boot band (20, 21) has an axial length shorter than the axial length of the band fitting groove (24, 25), so that the boot end (17 18) and fixed within the range in the axial direction.

  Next, a method for attaching and fixing the boot end portions (17, 18) to the outer ring 2 (or the shaft 9) will be described.

  First, as shown in FIG. 2, by fitting the boot band 20 into the band fitting groove 24 of the large diameter end portion 17, the boot band 20 is extrapolated to the large diameter end portion 17 and the band of the small diameter end portion 18. By fitting the boot band 21 in the fitting groove 25, the boot band 21 is extrapolated to the small diameter end portion 18.

  After that, as shown in FIG. 2, the boot band (20, 21) is inserted into the cylindrical heating medium X (heater, dryer, etc.) and heated at the same time and at the same temperature for the entire length in the circumferential direction. Reduce diameter. Accordingly, the boot end portions (17, 18) can be fastened and fixed to the outer ring 2 (or the shaft 9), and the boot bands (20, 21) can be attached and fixed to the boot end portions (17, 18).

  Thus, in this embodiment, since the boot band (20, 21) is formed into an endless shape, the boot band (20, 21) has an annular connection end by overlapping or connecting both ends of the plate-like boot band. Unlike conventional boot bands (see FIG. 8), the overlapping state (or joined state) of the connecting ends is not loosened and the tightening force does not decrease, so the tightening force does not decrease. Therefore, the sealing performance of the boot end portions (17, 18) is improved, and the lubricating component can be prevented from leaking from the inside of the outer ring 2 to the outside.

  Further, since the boot band (20, 21) does not require the work of making the plate-shaped boot band into an annular shape as in the conventional boot band (see FIG. 8), it is necessary for manufacturing the constant velocity universal joint 1. The number of work processes can be reduced. Therefore, the cost and time required for manufacturing the constant velocity universal joint 1 can be reduced.

  Furthermore, since it is not necessary to provide the boot band (20, 21) with a structure for reducing the diameter (for example, the ear portion 153 of the boot band 120 shown in FIG. 8), a simple cylindrical shape as in this embodiment. It can be an annular shape. For this reason, the workability of the boot band (20, 21) is improved. Further, since the boot band (20, 21) can be formed into a simple cylindrical shape as described above, the attachment structure when attached to the boot end (17, 18) does not become bulky and is complicated. It does not become. As a result, the constant velocity universal joint 1 can be made compact as shown in FIG.

  In addition, since the heat treatment of the boot bands (20, 21) is performed uniformly over the entire length in the circumferential direction, the boot bands (20, 21) can be uniformly reduced in diameter along the entire length in the circumferential direction. Therefore, the boot end portions (17, 18) can be clamped and fixed uniformly over the entire length in the circumferential direction. As a result, the sealing performance of the boot end portions (17, 18) can be reliably improved.

  3 to 5 show a second embodiment of the present invention. FIG. 3 shows a sliding type constant velocity universal joint 51 (DOJ) to which the present invention is applied.

  In the present embodiment, an endless boot band 20 made of a heat-shrinkable material is attached and fixed from the outer peripheral surface 26 of the large-diameter end 17 of the boot 16 to the outer peripheral surface 28 of the open end 15 of the outer ring 2.

  The boot band 20 includes a large-diameter portion 20a extending in the axial direction, a step portion 37 extending radially inward from an end portion on the side opposite to the bellows portion of the large-diameter portion 20a (the end portion on the right side of the drawing), The small-diameter portion 20b extends in the axial direction from the inner diameter end portion to the side opposite to the bellows portion (right side in the drawing). The large-diameter end portion 17 forms an engagement portion 35 that extends in the axial direction from the end surface 36 to the bellows portion side (left side in the drawing). In the boot band 20, the large-diameter portion 20 a is engaged and fixed to the engaging portion 35 formed in the large-diameter end portion 17. Further, the small diameter portion 20 b is attached and fixed to the outer peripheral surface 28 of the opening end portion 15 of the outer ring 2. The inner side surface 38 of the stepped portion 37 of the boot band 20 is brought into close contact with the end surface 36 of the large diameter end portion 17.

  An endless boot band 21 made of a heat-shrinkable material is attached and fixed from the outer peripheral surface 27 of the small diameter end portion 18 of the boot 16 to the outer peripheral surface 29 of the shaft 9.

  The boot band 21 includes a large-diameter portion 21a extending in the axial direction, a step portion 41 extending radially inward from an end portion on the side opposite to the bellows portion of the large-diameter portion 21a (the end portion on the left side of the drawing), A small-diameter portion 21b extending in the axial direction from the inner diameter end portion to the side opposite to the bellows portion (the left side in the drawing). The small-diameter end portion 18 forms an engaging portion 39 that extends in the axial direction from the end face 40 to the bellows portion side (right side in the drawing). In the boot band 21, the large diameter portion 21 a is engaged with and fixed to an engagement portion 39 formed in the small diameter end portion 18. The small diameter portion 21 b is attached and fixed to the outer peripheral surface 29 of the shaft 9. The inner side surface 42 of the stepped portion 41 of the boot band 21 is brought into close contact with the end surface 40 of the small diameter end portion 18.

  Next, a method for attaching the boot band (20, 21) in the present embodiment will be described.

  First, as shown in FIG. 4, the bellows side end of the cylindrical boot band (20, 21) is engaged with the engaging portion (35, 39) formed on the boot end (17, 18). Thus, the boot end (17, 18) is extrapolated in contact. Further, the end portion of the boot band (20, 21) on the side opposite to the bellows portion projects in the axial direction from the boot end portion (17, 18) to the side of the bellows portion. Extrapolate to shaft 9). For this reason, the anti-bellows part side end part of the boot band (20, 21) is in a non-contact state with the opening end part 15 (or the shaft 9) of the outer ring 2. In addition, in the boot band (20, 21), the axial length of the anti-bellows portion side end portion protruding in the axial direction from the boot end portion (17, 18) to the anti-bellow portion portion side is the boot end portion (17, 18). ) In the radial direction of the end faces (36, 40).

  Thereafter, as shown in FIG. 4, the boot bands (20, 21) are inserted into the cylindrical heating medium Y, and the boot bands (20, 21) are simultaneously heated at the same temperature and at the same temperature over the entire length in the circumferential direction. To do. Thereby, the boot band (20, 21) is reduced in diameter, and as shown in FIG. 3 described above, the large diameter portion (20a, 21a), the small diameter portion (20b, 21b), and the step portion ( 37, 41). Here, the heating of the boot band (20, 21) is such that the inner surface (38, 42) of the stepped portion (37, 41) is in close contact with the end surface (36, 40) of the boot end (17, 18). To do.

  With such a method of attaching the boot band (20, 21), as shown in FIG. 3, the boot band (20, 21) has a boot end (17, 18) and an open end 15 (or shaft) of the outer ring 2. 9) The outer peripheral surfaces (28, 29) of 9) are fastened and fixed.

  In the case of this embodiment, the boot band (20, 21) is attached not only to the boot end (17, 18) but also to the outer peripheral surface (28, 29) of the open end 15 (or shaft 9) of the outer ring 2. Since it can be fixed, the boot band (20, 21) performs a sealing function. Therefore, the sealing performance of the boot end portions (17, 18) can be greatly improved.

  Further, in order to bring the inner surface (38, 42) of the stepped portion (37, 41) of the boot band (20, 21) into close contact with the end surface (36, 40) of the boot end (17, 18), the boot band (20 21) and the boot end portions (17, 18) and the open end portion 15 (or the shaft 9) of the outer ring 2 and the boot bands (20, 21) are not generated. Therefore, the sealing function of the boot band (20, 21) is improved, and accordingly, the sealing performance of the boot end (17, 18) can be greatly improved. As a result, it is possible to reliably prevent the lubricating component inside the outer ring 2 from leaking to the outside.

  Since other operations and effects of the boot band (20, 21) mounting structure and mounting method of this embodiment are the same as those of the first embodiment shown in FIGS. 1 and 2, a detailed description thereof will be given. Is omitted.

  5 and 6 show a third embodiment of the present invention. FIG. 5 shows a sliding type constant velocity universal joint 71 (DOJ) to which the present invention is applied.

  In the present embodiment, an endless boot band 20 formed of a heat-shrinkable material is attached and fixed from the outer peripheral surface 26 of the large-diameter end 17 of the boot 16 to the outer peripheral surface 28 of the open end 15 of the outer ring 2.

  The boot band 20 includes a large-diameter portion 20c extending in the axial direction, a step portion 57 extending radially inward from an end portion on the anti-bellows portion side of the large-diameter portion 20c (the end portion on the right side of the drawing), A small-diameter portion 20d extending in the axial direction from the inner diameter end portion to the side opposite to the bellows portion (the right side of the drawing). The large-diameter end portion 17 forms an engagement portion 55 that extends in the axial direction from the end surface 56 to the bellows portion side (left side in the drawing). In the boot band 20, the large-diameter portion 20 c is attached and fixed by engaging with an engaging portion 55 formed in the large-diameter end portion 17. Further, the small diameter portion 20 d is attached and fixed to the outer peripheral surface 28 of the open end portion 15 of the outer ring 2. The inner side surface 58 of the stepped portion 57 of the boot band 20 is brought into close contact with the end surface 56 of the large diameter end portion 17.

  An endless boot band 21 made of a heat-shrinkable material is attached and fixed from the outer peripheral surface 27 of the small diameter end portion 18 of the boot 16 to the outer peripheral surface 29 of the shaft 9.

  The boot band 21 includes a large-diameter portion 21c extending in the axial direction, a step portion 61 extending radially inward from an end portion on the side opposite to the bellows portion of the large-diameter portion 21c (the end portion on the left side of the drawing), The small-diameter portion 21d extends in the axial direction from the inner diameter end portion to the side opposite to the bellows portion (left side in the drawing). The small-diameter end portion 18 forms an engaging portion 59 that extends in the axial direction from the end surface 60 to the bellows portion side (right side in the drawing). In the boot band 21, the large diameter portion 21 c is attached and fixed by being engaged with an engagement portion 59 formed in the small diameter end portion 18. Further, the small diameter portion 21 d is attached and fixed to the outer peripheral surface 29 of the shaft 9. The inner side surface 62 of the stepped portion 61 of the boot band 21 is brought into close contact with the end surface 60 of the small diameter end portion 18.

  Next, a method for attaching the boot band (20, 21) in the present embodiment will be described.

  First, as shown in FIG. 6, the boot band 20 is extrapolated to the outer ring 2 from the side opposite to the bellows portion (the right side in the drawing) of the outer ring 2. As described above with reference to FIG. 5, the boot band 20 has a large-diameter portion 20c extending in the axial direction and a radially inner side from an end portion on the side opposite to the bellows portion of the large-diameter portion 20c (the end portion on the right side of the drawing). A stepped portion 57 that extends, and a small-diameter portion 20d that extends in the axial direction from the inner diameter end of the stepped portion 57 to the side opposite to the bellows (right side in the drawing). The above-described extrapolation of the boot band 20 to the outer ring 2 is performed by extrapolating the small diameter portion 20d to the outer peripheral surface 28 of the outer ring 2 in a contact state.

  Thereafter, as shown by arrow A, the boot band 20 is slid in the axial direction toward the bellows side (the left side in the drawing), and the inner side surface 58 of the stepped portion 57 is moved to the end surface 56 of the large-diameter end portion 17 of the boot 16. Make contact. Thereby, the large diameter part 20c is engaged with the engaging part 55 formed in the large diameter end part 17, and the large diameter part 20c is extrapolated to the large diameter end part 17 in a contact state.

  Next, the boot band 21 is extrapolated to the shaft 9 from the side of the shaft 9 opposite to the bellows (left side in the drawing). As described above with reference to FIG. 5, the boot band 21 has a large-diameter portion 21c that extends in the axial direction, and a radially inner side from an end portion on the side opposite to the bellows portion of the large-diameter portion 21c (the end portion on the left side of the drawing). A stepped portion 60 that extends, and a small-diameter portion 21d that extends in the axial direction from the inner diameter end of the stepped portion 60 to the end on the side opposite to the bellows portion (the end on the left side of the drawing). The extrapolation of the boot band 21 to the shaft 9 is performed by extrapolating the small diameter portion 21d to the outer peripheral surface 29 of the shaft 9 in a contact state.

  Thereafter, as shown by arrow B, the boot band 21 is slid in the axial direction toward the bellows portion (right side of the drawing) so that the inner surface 62 of the stepped portion 61 contacts the end surface 60 of the small diameter end portion 18 of the boot 16. Make contact. Accordingly, the large diameter portion 21c is engaged with the engaging portion 59 formed on the small diameter end portion 18, and the large diameter portion 20c is extrapolated to the small diameter end portion 18 in a contact state.

  Then, as shown in FIG. 6, the boot bands (20, 21) are inserted into the cylindrical heating medium Z, and the boot bands (20, 21) are simultaneously heated at the same temperature at the same time for the entire length in the circumferential direction. . Thereby, the boot band (20, 21) is reduced in diameter.

  With such a method of attaching the boot band (20, 21), as shown in FIG. 5, the boot band (20, 21) has a boot end (17, 18) and an open end 15 (or shaft) of the outer ring 2. 9) The outer peripheral surfaces (28, 29) of 9) are fastened and fixed.

  In the case of this embodiment, the boot band (20, 21) includes the outer peripheral surface (26, 27) of the boot end (17, 18) and the outer peripheral surface (28, 27) of the open end 15 (or shaft 9) of the outer ring 2. 29) and the boot band (20, 21) are heated to reduce the diameter. Therefore, the tightening force of the boot band (20, 21) against the boot end (17, 18) and the opening end 15 (or shaft 9) of the outer ring 2 is improved, and the boot band (20, 21) is sealed. Will improve. As a result, the sealing performance of the boot end portions (17, 18) is improved, and leakage of the lubricating component enclosed in the outer ring 2 to the outside can be reliably prevented.

  In addition, since it is the same as that of 2nd Embodiment shown in FIG.3 and FIG.4 about the other effect | action and effect in the attachment structure and attachment method of the boot band (20, 21) of this embodiment, its detailed description Is omitted.

  Although the embodiments of the present invention have been described above, these are exemplifications, and can be arbitrarily changed without departing from the technical idea of the meaning and description of the claims.

  For example, although the embodiment described here is an application of the present invention to a double offset constant velocity universal joint (DOJ), the present invention is not limited to this, and the present invention can be applied to a known constant velocity universal joint. For example, fixed type constant velocity universal joints include ball fixture type constant velocity universal joints (BJ) and undercut free type constant velocity universal joints (UJ). Examples thereof include a groove type constant velocity universal joint (LJ) and a tripod type constant velocity universal joint (TJ).

It is sectional drawing which shows the 1st Embodiment of this invention. It is sectional drawing explaining the attachment method of the boot band shown in FIG. It is sectional drawing which shows the 2nd Embodiment of this invention. It is sectional drawing explaining the attachment method of the boot band shown in FIG. It is sectional drawing which shows the 3rd Embodiment of this invention. It is sectional drawing explaining the attachment method of the boot band shown in FIG. It is sectional drawing which shows the constant velocity universal joint which employ | adopted the conventional attachment structure and attachment method of a boot band. It is sectional drawing of the boot band shown in FIG. It is sectional drawing at the time of crimping the ear | edge part of the boot band shown in FIG.

Explanation of symbols

1, 51, 71 Sliding type constant velocity universal joint (DOJ)
2 Outer ring (outer joint member)
3 Inner ring (inner joint member)
9 Shaft (shaft member)
15 Open end (outer ring)
16 Boot 17 Large diameter end 18 Small diameter end 20, 21 Boot band 35, 55 Engaging portion (large diameter end)
36, 56 End face (large diameter end)
39, 59 Engagement part (small diameter end part)
40, 60 end face (small diameter end)
37, 41, 57, 61 Stepped part (boot band)
38, 42, 58, 62 Inner side (boot band step)

Claims (9)

A boot having one end attached to the open end of an outer joint member having an opening and the other end attached to a shaft member extending from the inside of the outer joint member to the outside of the joint includes the one end and the other. A boot band mounting structure that is fastened and fixed at the end by a boot band,
The boot band mounting structure is characterized in that the boot band is made of an endless heat-shrinkable material, and has a reduced diameter by heat treatment and is fixed to the boot end.   The boot band attachment structure according to claim 1, wherein the boot band is attached and fixed within an axial range of the boot end.   The bootband mounting structure according to claim 1, wherein the bootband is mounted and fixed from the boot end to the open end of the outer joint member or the shaft member.   The boot band includes a large-diameter portion that extends in the axial direction, a step portion that extends radially inward from the large-diameter portion, and a small-diameter portion that extends in the axial direction from the step portion. The boot according to claim 3, wherein the small-diameter portion is fixedly attached to an opening end portion or a shaft member of an outer joint member, and an inner surface of the stepped portion and an end surface of the boot end portion are in close contact with each other. Band mounting structure. A boot having one end attached to an open end of an outer joint member having an opening, and another end attached to a shaft member extending from the inside of the outer joint member to the outside of the joint, the one end and the other A method of attaching a boot band that is fastened and fixed by a boot band at an end,
The boot band is formed into an endless shape with a heat-shrinkable material, extrapolated to the boot end, and then attached to the boot end by shrinking the diameter by heat treatment. Mounting method.   The boot band is extrapolated from the boot end to the opening end of the outer joint member or the shaft member, and then reduced in diameter by heat treatment, so that the boot band extends from the boot end to the outer joint member or shaft member. The method for attaching the boot band according to claim 5, wherein the boot band is attached and fixed.   The boot band has a cylindrical shape, one end is extrapolated in contact with the boot end, and the other end is protruded in the axial direction from the boot end. The first end portion is attached and fixed to a boot end portion by being extrapolated to a member and then reduced in diameter by heat treatment, and the other end portion is attached and fixed to an opening end portion or a shaft member of an outer joint member. 7. A method for attaching the boot band according to 6.   The boot band includes a large-diameter portion extending in the axial direction, a step portion extending radially inward from the large-diameter portion, and a small-diameter portion extending in the axial direction from the step portion, and an inner surface of the step portion By contacting the end surface of the boot end portion, the large diameter portion is extrapolated in contact with the boot end portion, and the small diameter portion is extrapolated in contact with the opening end portion or the shaft member of the outer joint member. Then, the diameter of the boot band is reduced by heat treatment, whereby the large diameter portion is attached and fixed to the boot end portion, and the small diameter portion is attached and fixed to the open end portion or the shaft member of the outer joint member. A method for attaching the boot band as described in 1.   The method of attaching a boot band according to any one of claims 5 to 8, wherein the heat treatment is performed uniformly over the entire length in the circumferential direction.

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