JP2019152259A - Boot for constant velocity joint - Google Patents

Abstract

To prevent damage and breakage of a boot for a constant velocity joint caused by an excessive bending angle in carrying and assembling the constant velocity joint.SOLUTION: In a boot 5 composed of a large-diameter cylindrical portion 6 mounted on an outer joint member 1 of a constant velocity joint, a small-diameter cylindrical portion 7 mounted on a driving-side shaft 2, and a bent portion 8 connecting the large-diameter cylindrical portion 6 and the small-diameter cylindrical portion 7, and bent into the projecting shape toward an opening of the outer joint member 1, the bent portion 8 includes an angle restriction portion 8b provided with a conical face 8c having a shaft center same as a shaft center of a driving-side shaft 2 at an inner peripheral side, and the angle restriction portion 8b of the bent portion 8 is brought into contact with an outer peripheral cylindrical face of the small-diameter cylindrical portion 7 at its conical face 8c to restrict the bending angle, when the bending angle between the shaft center of the outer joint member 1 and the shaft center of the driving-side shaft 2 becomes a prescribed angle, thus the constant velocity joint is hardly damaged and broken in being carried and assembled.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a constant-velocity joint boot that is attached to a constant-velocity joint and prevents leakage of lubricant in the constant-velocity joint and intrusion of foreign matter from the outside.

  Constant velocity joints used for power transmission in vehicles and various industrial machines are provided between the drive-side shaft and the driven-side shaft, and drive even when the axes of the shafts do not match (the operating angle is taken). An outer joint member connected to one of the shafts (hereinafter referred to as a “first shaft”) so as to rotate integrally therewith; Between the outer joint member and the inner joint member, which is arranged on the radially inner side of the joint member and connected to the other shaft (hereinafter referred to as “second shaft”) so as to be integrally rotatable. And a torque transmission mechanism that performs torque transmission. Normally, grease and other lubricants filled inside are prevented from leaking to the outside, and foreign materials such as dust and water are prevented from entering the inside from the outside. It is used in a state where the formed constant velocity joint boot (hereinafter also simply referred to as “boot”) is mounted.

  The constant velocity joint boot includes a large-diameter cylindrical portion fitted to the outer peripheral surface on the opening side of the outer joint member and a small-diameter cylindrical portion fitted to the outer peripheral surface of the second shaft connected to the inner joint member. And a bent portion that bends in a convex shape toward the outer joint member between these two cylindrical portions, and the large-diameter cylindrical portion and the small-diameter cylindrical portion are each tightened with an annular metal boot band, Some are fixed to the outer joint member and the second shaft (for example, see Patent Document 1).

  In addition, in a boot attached to a constant velocity joint that transmits high-speed rotation, in order to prevent deformation due to centrifugal force, an axial one end portion of an annular boot adapter made of a thin metal plate is used instead of a large-diameter cylindrical portion. In other cases, the other end in the axial direction is attached to the outer periphery of the outer joint member (see, for example, Patent Document 2).

Japanese Patent No. 5295364 JP 2007-247860 A

  By the way, in the constant velocity joint equipped with the boot as described above, when the bending angle formed between the axis of the outer joint member and the axis of the second shaft increases, a part of the boot is connected to the outer joint member or the boot adapter. There is a problem of being damaged or broken by being sandwiched between the second shafts or coming into contact with the boot band that fixes the small-diameter cylindrical portion of the boot to the second shaft.

  Here, the above bending angle does not become larger than the designed maximum operating angle after the constant velocity joint is incorporated into a vehicle or the like. Sometimes, the operating angle may be larger than the maximum value, and in such a case, the boot is easily damaged or broken.

  For this reason, it is necessary to handle such constant velocity joints with great care so that the bending angle does not become excessively large from the time when the boots are mounted to the time when the assembly work to the vehicle or the like is completed. There was a burden on the workers.

  In addition, in order to prevent damage and breakage of boots during transportation, measures to put a cushioning material to regulate the bending angle in the constant velocity joint and the end of the assembly line of the constant velocity joint to the vehicle etc. There are cases where measures are taken near the work site to shorten the transport distance, but the former measure leads to an increase in workload due to the attachment and detachment of cushioning materials, etc. The latter measure is the layout of the assembly line It is easy to lead to restrictions.

  Accordingly, an object of the present invention is to prevent damage / breakage of a constant velocity joint boot caused by an excessive bending angle when the constant velocity joint is transported and assembled.

  In order to solve the above-described problems, the present invention provides an outer joint member that is coupled to a first shaft so as to be integrally rotatable, and is disposed radially inside the outer joint member so as to be integrally rotatable on a second shaft. Applied to a constant velocity joint including an inner joint member coupled to the outer joint and a torque transmission mechanism that transmits torque between the outer joint member and the inner joint member, and is attached to the outer periphery of the second shaft. A small-diameter cylindrical portion that extends radially outward from the small-diameter cylindrical portion and bends in a convex manner toward the outer joint member, and a large-diameter cylindrical portion that continues to the outer end of the bent portion or In a constant velocity joint boot in which an annular boot adapter connected to the outer end of the bent portion is attached to the outer periphery of the outer joint member, at least one of the bent portion and the small-diameter cylindrical portion is provided with the outer joint member. Heart and makes bending angle of the axis of the second shaft is adopted a configuration in which the angle regulating portion for regulating the bending angle in contact mating and those when it is a predetermined angle is provided.

  According to the above configuration, even when a load that relatively bends (inclins) the outer joint member and the second shaft is applied when the constant velocity joint is transported or incorporated in a vehicle or the like, the bending angle is not increased. When the predetermined angle is reached, the angle restricting portion provided on at least one of the bent portion of the boot and the small-diameter cylindrical portion restricts the bending angle so that it does not become excessive, so that a part of the boot is connected to the outer joint member or the boot adapter. There is no risk of being sandwiched between the second shafts or coming into contact with the boot band, and damage or breakage is less likely to occur.

  Here, the angle restricting portion is provided at the bent portion, and is a conical surface having the same axis as the axis of the second shaft at the time of angle restriction, and comes into contact with the outer peripheral cylindrical surface of the small diameter cylindrical portion. If it is set as such, the impact when an angle control part contact | abuts with a small diameter cylinder part will become small, and it can be made hard to produce both damage by the impact.

  When the small-diameter cylindrical portion is fixed to the second shaft by an annular boot band in the vicinity of the portion in contact with the bent portion, the outer diameter of the portion in contact with the bent portion is the outer diameter of the boot band. It is preferable that it is formed larger than that. If it does in this way, the damage by the contact with the boot band of the bending part when the bending angle of a constant velocity joint turns into a predetermined angle can be prevented.

  A plurality of axial grooves are provided at predetermined intervals in the circumferential direction on the inner peripheral surface or outer peripheral surface of the portion that contacts the bent portion, or the inner peripheral surface of the portion that contacts the bent portion. Alternatively, by providing a plurality of circumferential grooves at predetermined intervals in the axial direction on the outer peripheral surface, the impact when the bent portion and the small-diameter cylindrical portion come into contact is reduced, and damage due to the impact occurs. Can be difficult.

  It is desirable that the bent portion is formed so that a portion closest to the outer joint member does not come into contact with the outer joint member in a state in which the bending angle is restricted, so that damage or breakage is less likely to occur. .

  When a large-diameter cylindrical portion continuous to the outer end portion of the bent portion is attached to the outer periphery of the outer joint member, the portion closest to the outer joint member in the bent portion is the entire boot, Other than the attachment part to the outer joint member of the large-diameter cylinder part and the attachment part to the second shaft of the small-diameter cylinder part, the other parts are relatively rigid. This is preferable because it becomes difficult to be deformed and the bending angle of the constant velocity joint can be regulated more reliably around a predetermined angle.

  In addition, when a large-diameter cylindrical portion continuous to the outer end portion of the bent portion is attached to the outer periphery of the outer joint member, an axially outer surface and the small-diameter cylindrical portion extend from the large-diameter cylindrical portion to the bent portion. If a plurality of recesses opened on the inner peripheral surface of the abutting portion are provided at predetermined intervals in the circumferential direction, the material of the entire boot can be reduced and the weight can be reduced.

  As described above, the constant velocity joint boot of the present invention regulates the bending angle by contacting at least one of the bent portion and the small diameter cylindrical portion with the other side when the bending angle of the constant velocity joint becomes a predetermined angle. Therefore, even when the constant velocity joint is transported or incorporated in a vehicle or the like, damage or breakage due to an excessive bending angle can be reliably prevented.

  Therefore, the constant velocity joint fitted with this boot is easy to handle during transportation and assembly, and no cushioning material is required. In addition, since it is not necessary to arrange the end of the assembly line of the constant velocity joint in the vicinity of the assembly place, the degree of freedom in the layout of the assembly line is increased.

Front sectional view of a constant velocity joint equipped with the boot of the first embodiment Explanatory drawing of the thickness dimension of the boot of FIG. Front sectional view showing a bent state of the constant velocity joint of FIG. Radial direction sectional view which shows the modification of the small diameter cylinder part of the boot of FIG. Front sectional view of a constant velocity joint equipped with the boot of the second embodiment Front sectional drawing of the principal part which shows the bending state of the constant velocity joint of FIG. (A)-(c) is explanatory drawing of the 1st-3rd modification of the boot of FIG. 5, respectively ((a), (b) is front sectional drawing of a principal part, (c) is a diameter of a principal part. Cross-sectional view) Front sectional drawing of the principal part which shows the bending state of the constant velocity joint equipped with the boot of 3rd Embodiment. Front sectional view of a constant velocity joint equipped with the boot of the fourth embodiment Front sectional view showing a first modification of the boot of FIG. Sectional view along line XI-XI in FIG. Front sectional drawing which shows the 2nd modification of the boot of FIG. Sectional view along line XIII-XIII in FIG. Front sectional drawing of the principal part which shows the modification of the recessed part shape of the boot of FIG. Front sectional view of the constant velocity joint equipped with the boot of the fifth embodiment

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 3 show a fixed type constant velocity joint equipped with the boot according to the first embodiment. As shown in FIG. 1, the constant velocity joint includes a cup-shaped outer joint member 1 connected to a driven shaft (not shown) as a first shaft so as to be integrally rotatable, and a radial direction of the outer joint member 1. Torque transmission between a ring-shaped inner joint member 3 arranged on the inner side and connected to one end portion of a drive side shaft 2 as a second shaft so as to be integrally rotatable, and the outer joint member 1 and the inner joint member 3 And a torque transmission mechanism 4 for performing

  The torque transmission mechanism 4 is formed on the inner peripheral surface of the outer joint member 1 on the inner peripheral surface of the outer joint member 1 and on the outer peripheral surface of the inner joint member 3 in correspondence with the axial groove 1a of the outer joint member 1. A plurality of torque transmitting balls 41 incorporated between the plurality of axial grooves 3a and a cage 42 that rotatably holds the balls 41 at equal intervals are provided. The shaft 2 can be transmitted at a constant speed while being tilted relative to the shaft 2.

  The outer joint member 1 is filled with grease (not shown) as a lubricant, and in order to prevent leakage of the grease and intrusion of foreign matter from the outside to the inside, the first embodiment is used. The constant velocity joint boot 5 is attached.

  The constant velocity joint boot 5 is formed of a material such as resin or rubber, and has a large-diameter cylindrical portion 6 attached to the outer periphery of the opening-side end portion of the outer joint member 1 and a predetermined axis from the outer joint member 1. It consists of a small-diameter cylindrical portion 7 attached to the outer periphery of the drive-side shaft 2 at a position separated by a directional distance, and a bent portion 8 that connects the large-diameter cylindrical portion 6 and the small-diameter cylindrical portion 7. The large-diameter cylindrical portion 6 and the small-diameter cylindrical portion 7 are fastened by annular metal boot bands 9 and 10, respectively, to the outer peripheral surface of the opening side end portion of the outer joint member 1 and the outer peripheral surface of the drive side shaft 2. It is fixed in close contact.

  The large-diameter cylindrical portion 6 has a straight cylindrical portion 6b extending in the axial direction on one end side of the mounting portion 6a fixed to the outer joint member 1 by the boot band 9, and the small-diameter cylindrical portion 7 is driven by the boot band 10. A straight tube portion 7b extending in the axial direction is provided on the other end side of the attachment portion 7a fixed to the side shaft 2. The bent portion 8 extends radially outward from the other end of the straight tube portion 7b of the small diameter tube portion 7, bends in a convex shape toward the opening of the outer joint member 1, and has a large diameter tube at the outer end portion 8a. The straight part 6b of the part 6 is continuous with one end.

  Here, the straight tube portion 6 b of the large diameter tube portion 6 is formed to be thicker than the mounting portion 6 a, and the straight tube portion 7 b of the small diameter tube portion 7 is formed to have an outer diameter larger than the outer diameter of the boot band 10. ing. Further, the straight tube portion 7b of the small diameter tube portion 7 is a thick portion where one end side continuous to the mounting portion 7a is in contact with the outer peripheral surface of the drive side shaft 2, and the other end side continuous to the bent portion 8 is a thick portion. The outer diameter is the same as the outer peripheral surface of the drive-side shaft 2 and is a thin portion that is not in contact. The bent portion 8 is formed with the thinnest portion closest to the outer joint member 1, and an angle regulating portion 8b having a constant thickness is provided at a position continuous to the outer end portion 8a.

  Further, as shown in FIG. 2, the thickness of the straight tube portion 6b of the large diameter tube portion 6 is Z1, the thickness of the outer end portion 8a of the bent portion 8 is Z2, the thickness of the angle restricting portion 8b of the bent portion 8 is t1, and the small diameter When the thickness of the thick portion of the straight tube portion 7b of the tube portion 7 is t2, the thickness t3 of the portion closest to the outer joint member 1 in the bent portion 8 is smaller than any of Z1, Z2, t1, and t2. It has become. That is, the portion of the entire boot that is closest to the outer joint member 1 in the bent portion 8 is the attachment portion 6a of the large-diameter cylindrical portion 6 to the outer joint member 1 and the attachment of the small-diameter cylindrical portion 7 to the drive side shaft 2. It is formed in the smallest thickness except the part 7a.

  Then, as shown in FIG. 3, the outer joint member 1 and the drive side shaft 2 are relatively bent (inclined) to form the axis of the outer joint member 1 and the axis of the drive side shaft 2. When the bending angle reaches a predetermined angle (α in the figure), the angle restricting portion 8b of the bent portion 8 comes into contact with the outer peripheral cylindrical surface of the straight cylindrical portion 7b of the small diameter cylindrical portion 7 at the conical surface 8c, and the bent portion 8 is outside. The bending angle is regulated before being sandwiched between the joint member 1 and the drive side shaft 2. In this angle restricted state, the conical surface 8 c is formed to have substantially the same axis as the axis of the drive side shaft 2. Here, as described above, the portion of the entire boot that is closest to the outer joint member 1 of the bent portion 8 is formed to be the thinnest except for the attachment portions 6a and 7a of the large diameter cylindrical portion 6 and the small diameter cylindrical portion 7. Therefore, the other parts are relatively rigid and difficult to be deformed, and the bending angle is reliably regulated around a predetermined angle.

  At this time, the bent portion 8 as a whole is not only sandwiched between the outer joint member 1 and the drive-side shaft 2, but also does not come into contact with the outer joint member 1 even at a portion closest to the outer joint member 1. Yes. Further, the angle restricting portion 8 b does not come into contact with the boot band 10 that fixes the small diameter cylindrical portion 7 to the drive side shaft 2. This is because the mounting portion 7a fastened to the boot band 10 in the small-diameter cylindrical portion 7 is provided on the outer side in the axial direction than the straight cylindrical portion 7b in contact with the angle regulating portion 8b, and the outer diameter of the straight cylindrical portion 7b is that of the boot band 10. This is because it is formed larger than the outer diameter.

  This constant velocity joint boot 5 is configured as described above, and the outer joint member 1 and the drive side shaft 2 are relatively bent (tilted) when the constant velocity joint is transported or incorporated in a vehicle or the like. Even when a load is applied, the angle restricting portion 8b provided in the bent portion 8 restricts the bending angle of the constant velocity joint, and the bent portion 8 is not sandwiched between the outer joint member 1 and the drive side shaft 2, and the outer joint member. 1 and the boot band 10 are not brought into contact with each other.

  Further, since the conical surface 8c of the angle restricting portion 8b of the bent portion 8 comes into contact with the outer peripheral cylindrical surface of the straight tube portion 7b of the small diameter cylindrical portion 7, the bending angle becomes a predetermined angle and the small diameter of the bent portion 8 is reduced. The impact when the cylindrical portion 7 abuts is small, and damage to both due to the impact is less likely to occur.

  Here, as in the modification shown in FIG. 4, a plurality of axial grooves 7 c are provided at predetermined intervals in the circumferential direction on the inner peripheral surface of the thick portion of the straight cylindrical portion 7 b of the small diameter cylindrical portion 7. Further, the impact when the bent portion 8 and the small-diameter cylindrical portion 7 come into contact with each other is alleviated and is not easily damaged. Moreover, although illustration is abbreviate | omitted, the circumferential direction groove | channel can also be provided with two or more by the predetermined spacing in the axial direction in the thick part inner peripheral surface of the straight cylinder part 7b of the small diameter cylinder part 7. FIG.

  5 and 6 show a constant velocity joint equipped with the boot of the second embodiment. The boot 5 of this embodiment is based on that of the first embodiment, and when the bending angle of the constant velocity joint becomes a predetermined angle, the angle regulating portion 8b of the bent portion 8 protrudes from the conical surface 8c. The projecting portion 8d is in contact with the angle restricting portion 7d protruding from the outer peripheral cylindrical surface of the straight cylindrical portion 7b of the small diameter cylindrical portion 7. The contact surfaces of these angle restricting portions 8b and 7d are formed substantially parallel to the conical surface 8c of the angle restricting portion 8b of the bent portion 8 and the outer peripheral cylindrical surface of the straight tube portion 7b of the small diameter cylindrical portion 7, respectively. Yes. Thereby, the impact when the bending part 8 and the small diameter cylinder part 7 contact | abut is relieved rather than 1st Embodiment by the elastic deformation of both angle control part 8b, 7d.

  Here, as in the first modification shown in FIG. 7A, a plurality of circumferential grooves 8e are provided on the convex portion 8d of the angle restricting portion 8b of the bent portion 8, or the first shown in FIG. As in the second modification, a plurality of circumferential grooves 7e are provided in the angle restricting portion 7d of the small-diameter cylindrical portion 7, or the angle of the small-diameter cylindrical portion 7 as in the third modified example shown in FIG. If a plurality of axial grooves 7f are provided in the restricting portion 7d, the impact when the angle restricting portion 8b of the bent portion 8 and the angle restricting portion 7d of the small diameter cylindrical portion 7 come into contact with each other is further mitigated, and damage is less likely to occur. Can be.

  Further, as in the third embodiment shown in FIG. 8, the angle restricting portion 8b of the bent portion 8 is provided with a convex portion 8d similar to the second embodiment, while the straight tube portion 7b of the small diameter tube portion 7 is provided on the straight tube portion 7b. A concave portion 7g into which the convex portion 8d of the angle regulating portion 8b is fitted when the bending angle of the constant velocity joint becomes a predetermined angle may be provided. By doing so, the contact area when the bent portion 8 and the small-diameter cylindrical portion 7 come into contact with each other is increased, so that the impact at the time of contact between both can be reduced as compared with the first embodiment.

  FIG. 9 shows a constant velocity joint equipped with the boot of the fourth embodiment. The boot 5 of this embodiment is based on that of the first embodiment, and the straight cylinder portion 6b of the large-diameter cylinder portion 6 is formed thick so as to be continuous with the entire angle regulating portion 8b of the bent portion 8. It is. Thereby, compared with 1st Embodiment, since the rigidity of the straight cylinder part 6b of the large diameter cylinder part 6 and the angle control part 8b of the bending part 8 becomes large, the improvement of a high-speed rotation performance can be aimed at.

  In the fourth embodiment, as in the first modification shown in FIGS. 10 and 11, a non-through hole 6c extending in the axial direction is provided in the circumferential direction on one end face of the straight tube portion 6b of the large diameter tube portion 6. Or a plurality of axially outer surfaces and angles from the straight tube portion 6b of the large-diameter tube portion 6 to the angle restricting portion 8b of the bent portion 8 as in the second modification shown in FIGS. By providing a plurality of recesses 6d that open to the inner peripheral surface of the restricting portion 8b at predetermined intervals in the circumferential direction, the material of the entire boot 5 can be reduced and the weight can be reduced.

  Here, the non-through hole 6c of the first modification shown in FIGS. 10 and 11 may be provided on the other end surface of the straight tube portion 6b of the large-diameter tube portion 6, or in combination with both end surfaces of the straight tube portion 6b. A plurality of them may be provided. Further, the axial sectional shape of the recess 6d of the second modification shown in FIGS. 12 and 13 is not limited to that shown in FIG. 12, but for example, to the conical surface 8c of the angle restricting portion 8b as shown in FIG. The one having a smaller opening may be adopted, and the one shown in FIG. 12 and the one shown in FIG. 14 may be mixed. In addition, the size and the circumferential interval of the non-through hole 6c of the first modification and the recess 6d of the second modification can be set as appropriate as long as the function of restricting the bending angle can be maintained.

  FIG. 15 shows a constant velocity joint equipped with the boot of the fifth embodiment. The boot 5 of this embodiment is obtained by eliminating the large-diameter cylindrical portion 6 of the first embodiment and forming the outer end portion 8a of the bent portion 8 in a Ω-shaped cross section, and the outer end portion 8a is an annular boot. The adapter 11 is connected to one end of the adapter 11.

  The boot adapter 11 is made of metal, and a boot connection portion 11a to which the outer end portion 8a of the bent portion 8 of the boot 5 is fixed by caulking, and an attachment portion to be fixed to the outer periphery of the opening side end portion of the outer joint member 1. 11b, a boot receiving portion 11c extending from the boot connecting portion 11a along the outer peripheral surface of the angle restricting portion 8b of the boot 5, and a connecting portion 11d extending radially inward from the mounting portion 11b and continuing to the boot receiving portion 11c. Become. A space between the attachment portion 11b and the outer joint member 1 is sealed with an O-ring 12. Further, the connecting portion 11 d is in contact with the opening end portion of the outer joint member 1.

  In the fifth embodiment, when the bending angle of the constant velocity joint reaches a predetermined angle, the angle restricting portion 8b of the boot 5 is restricted from moving outward in the radial direction by the boot receiving portion 11c of the boot adapter 11. Therefore, similarly to the other embodiments, the bending angle can be surely restricted in the vicinity of the predetermined angle, and the boot 5 can be hardly damaged or broken. In addition, in the angle regulation state, by forming the angle of the boot receiving portion 11c of the boot adapter 11 so as to have substantially the same axis as the axis of the drive side shaft 2, the impact at the time of contact can be reduced. it can.

  In each of the above embodiments, the required operating angle of the constant velocity joint is adjusted by adjusting the restriction angle with respect to the bending of the constant velocity joint, the angle restriction portion of the bent portion of the boot, and the position of the mounting portion of the small diameter cylindrical portion. The bending angle can be regulated accordingly.

  As described in the above embodiments, the present invention can surely prevent the boot from being damaged or broken due to an excessive bending angle of the constant velocity joint, so that the constant velocity joint can be easily handled during transportation and assembly. In addition, a cushioning material can be dispensed with. In addition, it is not necessary to take measures to place the end of the assembly line of the constant velocity joint in the vicinity of the assembly place, and the degree of freedom of the assembly line layout can be increased.

  Furthermore, by forming the straight cylinder part of the large-diameter cylindrical part of the boot and the angle regulating part of the bent part thickly, the amount of grease (lubricant) filled in the constant velocity joint is greatly reduced as compared with the conventional one. Therefore, there is an advantage that cost reduction and improvement in high-speed rotation performance can be expected.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the meanings described above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  For example, in the first and third to fifth embodiments, an angle restricting portion for restricting the bending angle of the constant velocity joint is provided in the bent portion of the boot, and in the second embodiment, both the bent portion and the small diameter cylindrical portion are provided. Although the angle restricting portion is provided, the angle restricting portion may be provided only on the small diameter cylindrical portion of the boot.

1 Outer joint member 2 Drive side shaft (second shaft)
3 Inner joint member 4 Torque transmission mechanism 5 Boot 6 Large-diameter cylindrical portion 6a Mounting portion 6b Straight cylindrical portion 6c Non-through hole 6d Recessed portion 7 Small-diameter cylindrical portion 7a Mounting portion 7b Straight cylindrical portion 7c Axial groove 7d Angle regulating portion 7e Circumferential groove 7f Axial groove 7g Concave part 8 Bent part 8a Outer end part 8b Angle restricting part 8c Conical surface 8d Convex part 8e Circumferential groove 9, 10 Boot band 11 Boot adapter 41 Ball 42 Cage

Claims (8)

An outer joint member coupled to the first shaft so as to be integrally rotatable, an inner joint member disposed radially inside the outer joint member and coupled to the second shaft so as to be integrally rotatable, and the outer joint member Applied to a constant velocity joint having a torque transmission mechanism for transmitting torque between the inner joint member and the inner joint member,
A small-diameter cylindrical portion attached to the outer periphery of the second shaft; and a bent portion that extends radially outward from the small-diameter cylindrical portion and bends in a convex manner toward the outer joint member. In the constant-velocity joint boot in which an annular boot adapter connected to the outer end of the outer joint member is connected to the outer end of the large-diameter cylindrical portion continuous to the bent portion or the bent portion,
When at least one of the bent portion and the small-diameter tubular portion has a predetermined bending angle between the axis of the outer joint member and the axis of the second shaft, the bending angle comes into contact with the other side. A constant-velocity joint boot, characterized in that an angle-regulating part for regulating is provided.   The angle restricting portion is provided in the bent portion, and comes into contact with a cylindrical surface on the outer periphery of the small diameter cylindrical portion at a conical surface having the same axis as the axis of the second shaft when the angle is restricted. The boot for a constant velocity joint according to claim 1.   The small-diameter cylindrical portion is fixed to the second shaft by an annular boot band in the vicinity of the portion that contacts the bent portion, and the outer diameter of the portion that contacts the bent portion is larger than the outer diameter of the boot band. The constant velocity joint boot according to claim 1, wherein the boot is constant.   4. The small-diameter cylindrical portion is provided with a plurality of axial grooves at a predetermined interval in the circumferential direction on an inner peripheral surface or an outer peripheral surface of a portion in contact with the bent portion. The constant velocity joint boot described in 1.   4. The small-diameter cylindrical portion is provided with a plurality of circumferential grooves at predetermined intervals in the axial direction on an inner peripheral surface or an outer peripheral surface of a portion in contact with the bent portion. The constant velocity joint boot described in 1.   The said bending part is formed so that the site | part nearest to the said outer joint member may not contact the said outer joint member in the state in which the said bending angle was controlled. The constant velocity joint boot described in Crab.   A large-diameter cylindrical portion continuing to the outer end portion of the bent portion is attached to the outer periphery of the outer joint member, and the portion closest to the outer joint member in the bent portion is the large-diameter portion of the entire boot. 7. The device according to claim 1, wherein the tube portion is formed to have the smallest thickness except for the attachment portion of the tubular portion to the outer joint member and the attachment portion of the small-diameter tubular portion to the second shaft. Boots for constant velocity joints.   A large diameter cylindrical portion continuous to the outer end of the bent portion is attached to the outer periphery of the outer joint member, and a portion that contacts the axially outer side surface and the small diameter cylindrical portion from the large diameter cylindrical portion to the bent portion. The boot for a constant velocity joint according to any one of claims 1 to 7, wherein a plurality of recesses that are opened in the inner peripheral surface are provided at predetermined intervals in the circumferential direction.

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