JP2002227870A - Resin-made boot for constant velocity joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin-made boot making coming-off difficult of a mounting part from a mating member when a constant velocity joint is operated. SOLUTION: A mounting part 1 of a resin-made boot in a mating member 5 is formed with a band mounting groove 2, a band stopper 3 is provided to protrude in an outer end of the mounting part 1. A protrusion 4 protruded to a diametric direction inward is formed in almost the central position in the axial direction of the mounting part 1. A side surface 3b facing the bellows part side of the band stopper 3 is inclined at a prescribed angle θ to the bellows part side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin boot for a constant velocity joint.

[0002]

2. Description of the Related Art In general, a resin boot for a constant velocity joint is provided with a small-diameter mounting portion mounted on a joint shaft of the constant velocity joint at one end of a bellows portion, and at the other end of the bellows portion with an outer ring of the constant velocity joint. It is configured to have a large-diameter mounting portion to be mounted. FIG. 5A shows a large-diameter mounting portion 31 of a conventional resin boot, and the large-diameter mounting portion 31 is provided with a band mounting groove 32. Band mounting groove 3
A band stopper 33 protrudes from the outer end of the second member 2, and a protrusion 34 protruding radially inward is formed substantially at the center of the large-diameter mounting portion 31 in the axial direction. The bottom surface 32a of the band mounting groove 32 extends substantially parallel to the axis of the boot, and the band stopper 33 projects substantially perpendicular to the bottom surface 32a of the band mounting groove 32.

[0003]

When the large-diameter mounting portion 31 shown in FIG. 5A is mounted on the outer ring 5 of the constant velocity joint, which is a mating member, as shown in FIG. Due to the existence, the outer periphery of the mounting portion 31, that is, the bottom surface 32a of the band mounting groove 32 rises like a drum, and the band stopper 33 may be inclined outward accordingly.

In this state, the band 6 is mounted on the band mounting groove 32 as shown in FIG.
, The angle of inclination of the band stopper 33 to the outside becomes slightly smaller. However, the band stopper 33 is still inclined outward. When such a condition occurs, during operation of the constant velocity joint, FIG.
There is a problem that the band 6 is likely to come off as indicated by the arrow A in FIG. An object of the present invention is to provide a resin boot for a constant velocity joint that solves such a problem.

[0005]

In order to solve the above-mentioned problems, the present invention provides a band stopper which is provided radially outward at an outer end of a mounting portion having a band mounting groove. In a resin boot for a constant velocity joint in which a projection protruding radially inward is formed at a substantially central position in the axial direction of the mounting portion, the side surface of the band stopper facing the bellows side is the bellows side. The present invention provides a resin boot characterized by being inclined.

[0006]

In the resin boot of the present invention, the side surface of the band stopper facing the bellows portion is inclined toward the bellows portion when the mounting portion is not attached to the mating member. Therefore, when the mounting portion is mounted on the mating member and tightened with the band, the side surface of the band stopper facing the bellows side does not tilt to the opposite side to the bellows portion, so that the band stopper is operated during the operation of the constant velocity joint. The band is less likely to come off.

[0007]

FIG. 1 shows a resin boot for a constant velocity joint according to a first embodiment of the present invention. The boot has a small-diameter mounting portion 7 attached to a joint shaft (not shown) of a constant velocity joint at one end of a bellows portion 12 and is attached to an outer ring of the constant velocity joint at the other end of the bellows portion 12. The configuration is such that a large-diameter mounting portion 1 is provided. In order to ensure the sealing performance, the inner diameter of the small-diameter mounting portion 7 is smaller than the outer diameter of the joint shaft as a mating member.
The inner diameter of the large-diameter mounting portion 1 is set smaller than the outer diameter of the outer ring that is the mating member. Band mounting grooves 8, 2 are formed in each of the small-diameter mounting portion 7 and the large-diameter mounting portion 1, and band stoppers are provided at the outer ends of the small-diameter and large-diameter mounting portions 7, 1 in a radially outward direction. 9 and 3 are protruded. Further, projections 10 and 4 projecting radially inward are formed substantially at the center of the small-diameter and large-diameter mounting portions 7 and 1 in the axial direction. When the small diameter and large diameter mounting portions 7 and 1 are respectively mounted on the joint shaft and the outer ring as mating members, these projections 10 and 4 form a high contact pressure portion due to linear contact with the mating member to improve the sealing property. In addition to improving the position, the function of positioning the small-diameter and large-diameter mounting portions 7, 1 with respect to the mating member is achieved.

[0008] As shown in FIG.
Has a band mounting groove 2, and a band stopper 3 protrudes from the outer end. The bottom surface 2a of the band mounting groove 2 extends substantially parallel to the axis 11 of the boot (FIG. 1), and the outer surface 3a of the band stopper 3, that is, the side surface facing the opposite side to the bellows portion 12, is on the bottom surface 2a of the band mounting groove 2. It extends almost at right angles to it. The inner surface 3b of the band stopper 3, that is, the side surface facing the bellows portion 12 is inclined toward the bellows portion 12 by a predetermined angle θ with respect to the bottom surface 2a of the band mounting groove 2.

The large-diameter mounting portion 1 is connected to an outer ring 5 as a mating member.
2, the outer periphery of the large-diameter mounting portion 1, that is, the bottom surface 2a of the band mounting groove 2
As shown in (b), the band stopper 3 is deformed in accordance with the swelling like a drum. However, since the inner side surface 3b of the band stopper 3 is still inclined toward the bellows portion 6, the band 6 is mounted in the band mounting groove 2 as shown in FIG. Is tightened against the outer ring 5, the inner side surface 3 b is inclined toward the bellows portion 12. Therefore, the band 6 does not easily come off during the operation of the constant velocity joint.

In the first embodiment, as shown in FIG. 2B, when the large-diameter mounting portion 1 is mounted on the outer race 5 and the band 6 is not tightened, the inner surface 3b of the band stopper 3 It is inclined toward the bellows portion 12. In this way, when the band 6 is tightened as shown in FIG. 2C, the inclination angle of the inner side surface 3b is further increased, and the band 6 can be effectively prevented from coming off. However, for example, even if the inner surface 3b of the band stopper 3 extends substantially perpendicularly to the axis 11 of the boot in the state of FIG. 2B, when the band 6 is tightened as shown in FIG. Since 3b is slightly inclined toward the bellows portion 12, the band 6 can be hardly detached. If the inner surface of the band stopper can be prevented from inclining to the opposite side of the bellows portion when the band is tightened as shown in FIG. In the state of, the band stopper 3
May be slightly inclined toward the opposite side of the bellows portion 12.

The predetermined angle θ, that is, the band stopper 3
If the inclination angle of the inner side surface 3b is too large, it becomes difficult to remove the mold during boot molding, and the moldability is deteriorated. Therefore, the inclination angle is preferably set to 60 ° or less. In the first embodiment, only the inner side surface 3b of the band stopper 3 of the large-diameter mounting portion 1 is inclined with respect to the bottom surface 2a of the band mounting groove 2, and the small-diameter mounting portion 7 is a conventional band shown in FIG. It has the same configuration as the stopper. However,
Of course, the inner surface of the band stopper 9 of the small-diameter mounting portion 7, that is, the side surface facing the bellows portion 12 can be inclined toward the bellows portion 12 like the inner surface 3b of the band stopper 3.

FIGS. 3A to 3C show a second embodiment of the present invention.
1 shows a resin boot according to an embodiment. These boots are
The bottom surface 12a of the band mounting groove 12 is inclined such that the diameter gradually increases at an angle of θ1 from a substantially central position in the axial direction of the boot to an inner end position in the axial direction, and from a substantially central position in the axial direction of the boot. It is inclined so that the diameter gradually increases at an angle of θ2 to the outer end position in the axial direction. Large-diameter mounting part 11
The inner peripheral surface 11b extends substantially in parallel with the bottom surface 12a of the band mounting groove 12, and thus gradually increases in diameter from the position of the projection 14 to the vicinity of the inner end and the outer end of the mounting portion. The band stopper 13 extends substantially at right angles to the bottom surface 12a of the band mounting groove 12, so that the inner side surface 13b of the band stopper 13 is inclined toward the bellows side. In this boot, when the large-diameter mounting portion 11 is attached to the outer race 5 as shown in FIG.
Even when the band 6 is tightened as in (c), the inner side surface 13b of the band stopper 13 is inclined toward the bellows. Therefore, similarly to the above-described first embodiment, it is possible to prevent the band 6 from coming off when the constant velocity joint is operated.

In the second embodiment, the inner peripheral surface 11b of the large-diameter mounting portion 11 is gradually enlarged from the position of the projection 14 to the vicinity of the inner end and the outer end of the mounting portion. In particular, since the diameter is gradually increased from the position of the projection 14 to the vicinity of the outer end of the large-diameter mounting portion 11, an advantage that the large-diameter mounting portion 10 can be easily mounted on the outer ring is obtained. In the second embodiment, by making the inner diameter near the outer end of the large-diameter mounting portion 11 larger than the outer diameter of the outer ring 5, the large-diameter mounting portion 11 can be easily mounted on the outer ring 5. is there.

FIG. 4 shows a resin boot according to a third embodiment of the present invention. In the above-described second embodiment, the bottom surface 12a of the band mounting groove 12 is inclined at angles of θ1 and θ2 from a substantially central position in the axial direction of the boot to an inner end position and an outer end position in the axial direction, respectively. But the third
The bottom surface 22a of the band mounting groove 22 in the embodiment is a curved surface gently curved with a radius R so as to protrude inward in the radius of the boot. Further, the inner peripheral surface 21b of the large-diameter mounting portion 21 in the boot of the third embodiment is a curved surface that is curved in parallel with the bottom surface 22a of the band mounting groove 22, and the large-diameter mounting portion 21 is positioned from the position of the projection 24. The diameter is gradually increased toward the inner end and the outer end. The band stopper 23 extends substantially at right angles to the bottom surface 22a of the band mounting groove 22, so that the inner side surface 23b of the band stopper 23 is inclined toward the bellows side. The configuration of the third embodiment other than the above-described points is the same as that of the second embodiment. As in the second embodiment, the band is less likely to come off, and there is an advantage that the mounting portion 21 can be easily attached to the outer ring. When the mounting portion 21 of the third embodiment is mounted on the outer race, the state becomes the same as that shown in FIG. 3B, and when the band is tightened, the state becomes the same as that shown in FIG. 3C.

[Brief description of the drawings]

FIG. 1 is an axial sectional view showing a resin boot for a constant velocity joint according to a first embodiment of the present invention.

FIG. 2 is an enlarged view showing a large-diameter mounting portion of the resin boot according to the first embodiment; FIG. 2 (a) is a diagram showing a state in which the large-diameter mounting portion is not mounted on a mating member; () Is a diagram showing a state in which the large-diameter mounting portion is mounted on the mating member, and (c) is a diagram showing a state in which the band is tightened.

FIG. 3 is an enlarged view showing a large-diameter mounting portion of a resin boot according to a second embodiment of the present invention, in which (a) shows a state in which the large-diameter mounting portion is not mounted on a mating member; (B) is a figure which shows the state which attached the large diameter attachment part to the other party member, (c) is a figure which shows the state which tightened the band.

FIG. 4 is an enlarged view showing a large-diameter mounting portion of a resin boot according to a third embodiment of the present invention.

5A and 5B are diagrams showing a large-diameter mounting portion of a conventional resin boot, wherein FIG. 5A shows a state in which the large-diameter mounting portion is not mounted on a mating member, and FIG. FIG. 7C is a diagram illustrating a state where the band is attached to a mating member, and FIG.

[Explanation of symbols]

 1,11,21,31 Mounting part (large diameter mounting part) 2,12,22,32 Band mounting groove 3,13,23,33 Band stopper 4,14,24,34 Projection 5, Material member (outer ring) 6 band

Claims (3)

[Claims] A band stopper protrudes radially outward from an outer end of a mounting portion having a band mounting groove, and projects radially inward at a substantially central position in the axial direction of the mounting portion. A resin boot for a constant velocity joint having projections, wherein a side surface of the band stopper facing the bellows portion is inclined toward the bellows portion. 2. The resin boot according to claim 1,
The side surface of the band stopper facing the bellows portion is inclined toward the bellows portion in a state where the mounting portion is attached to the mating member and the band is not tightened, or with respect to the axis of the boot. Resin boots characterized by extending substantially at right angles. 3. The resin boot according to claim 1, wherein an inner peripheral surface of the mounting portion is gradually increased in diameter from a position of the projection to an outer end of the mounting portion. Characterized resin boots.