JPH09242775A - Mount for boot - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a load from being applied to rotation of a mating side member by preventing an end part stopper from interfering with the other structure after it is incorporated though a relative position between a boot and a mount is determined by the end part stopper when the mount is incorporated. SOLUTION: A mount main body 8 interposed between a boot installing mating side member, for example, an outer ring 3 of an uniform coupling 2 and a boot fixing part 7 of a boot 1 and a deep entrance preventive end part stopper 9 coming into contact with an end surface of the boot fixing part 7 when incorporated into the boot fixing part 7, are provided, and notches 10 are arranged in circumferential plural places or on the whole circumference between a mount main body 8 and the boundary vicinity on the radial directional inside more than at least a boot band diameter of the end part stopper 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to various boots such as constant velocity joint boots (CVJ boots) used for automobiles, steering boots, and dust covers of various other mechanical elements (hereinafter simply referred to as boots in the present specification). ) Is mounted on a mating member such as a constant velocity joint or a rotating shaft without any gap, for a boot mount. More specifically,
The present invention relates to an improvement in a mount for boots used in a machine element that rotates at a high speed, such as a CVJ.

[0002]

2. Description of the Related Art In the case of a hard rubber boot or a resin boot, if they are directly attached to a mechanical element such as a constant velocity joint or a rotating shaft or a mating member, the sealing property between the mating member and the mating member may deteriorate. There is. In addition, even if you try to directly attach the boot to a mating member such as a tripod type constant velocity joint that has a non-circular outline cross-sectional shape of the part to which the boot is attached, uniform tightening will be difficult, so the seal There is a risk that the property will deteriorate. Therefore, in these cases, as shown in FIG. 9, the elastic cylindrical mounts 103 are fitted to the inner circumferences of the cylindrical boot fixing portions 102 at both ends of the boot 101, and the mounts 103 are mounted. Counterpart member 1
The boot 101 is assembled by fitting it to the outer peripheral surface of 04. The shape of the inner circumference of the mount is a shape corresponding to the contour shape of the counterpart member to which the boot is attached, and is provided so as to be in close contact with the counterpart member. Then, by tightening the boot fixing portion 102 with the boot band 105, sealing between the boot 101 and the mount 103 and between the mount 103 and the mating member 104 is performed.

Here, a flange-shaped end stopper 106 is formed on the end of the mount 103. The end stopper 106 is for contacting the end surface of the boot fixing portion 102 when the mount 103 is fitted to the inner periphery of the boot fixing portion 102, and prevents the mount 103 from further entering to prevent the mount 103 from entering. It is intended to prevent deep penetration. As a result, the mount 103 is arranged at a required position, that is, on the inner peripheral surface of the boot fixing portion 102 without being displaced, and is assembled between the mount 103 and the counterpart member.

[0004]

However, since the end stopper 106 is unavoidably protruded to the outside in the radial direction from the boot fixing portion 102 and the boot band 105 due to its function, the end stopper 106 is caused by centrifugal force during high speed rotation. Section stopper 106
May expand and interfere with other structures.

Further, since the end stopper 106 abuts the end surface of the boot fixing portion 102 to determine its position, it requires some rigidity. Therefore, the weight of the end stopper 106 is inevitably increased by that amount, which is one of the causes of the increase in the weight of the assembly.

Moreover, the end stopper 106 is necessary for positioning when the mount 103 is assembled, but is unnecessary after the assembly.

Therefore, according to the present invention, while the relative position between the boot and the mount is determined by the end stopper, the end stopper interferes with other structures and contributes to an increase in the weight of the assembly. The purpose is to provide a boot mount that does not have any.

[0008]

In order to achieve such an object, the present invention is a boot mount interposed between a mating member to which a boot is attached and a boot fixing portion of the boot. An end stopper for preventing the penetration of the end surface of the boot fixing portion is provided outside the mount body interposed between the mount main body and the mount main body, and the mount stopper is at least radially inside the boot band diameter of the end stopper. Notches are provided at a plurality of positions on the circumference or at the entire circumference between the vicinity of the boundary and.

Therefore, when the mount is fitted into the boot fixing portion, the end surface of the boot fixing portion and the end stopper come into contact with each other, so that further penetration of the mount is prevented and the depth of the mount is prevented, and the boot is prevented. The relative position between the fixed part and the mount is determined. In that state, it can be assembled to mechanical elements such as CVJ and other parts. Therefore, if the end stopper is pulled after the boot fixing portion is tightened with a boot band or the like, the outside of the notch is stripped off. For this reason, after the boot is assembled, only the mount body with the end stopper separated is interposed between the mating member and the boot fixing portion, and a part of the mount receives a centrifugal force during high-speed rotation. It does not protrude outside the boot band and interfere with it. Moreover, the weight of the mount itself is reduced, and the mounting weight is reduced.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The structure of the present invention will be described below in detail based on an example of an embodiment shown in the drawings. In the present embodiment, the boot mount mounted between the CVJ boot and the constant velocity joint is described. Of course,
The counterpart member is not limited to the outer ring portion of the constant velocity joint, and may be attached to other mechanical elements such as the sliding shaft. Further, the boots are not limited to CVJ boots, and may be applied to steering boots or dust covers.

1 and 2 show an embodiment of the present invention. In this embodiment, the mount 6 is mounted only between the boot fixing portion 7 on the large diameter side and the outer ring 3 of the constant velocity joint 2 which is a counterpart member. As shown in FIG. 1, boots 1
An elastic tubular mount 6 is fitted to the inner periphery of the tubular boot fixing portion 7 at the end of the boot 1, and the boot 6 is assembled by fitting the mount 6 to the outer ring 3. The shape of the inner peripheral surface of the mount 6 corresponds to the contour shape of the counterpart member to which the boot 1 is attached, and the contour cross-sectional shape of the portion to which the boot is attached is non-circular, such as a tripod type constant velocity joint. When the boot is to be mounted on the mating member, the mount 6 is provided with an inner peripheral surface having irregularities corresponding thereto, and is provided so as to be in close contact with the mating member. Then, by tightening the boot fixing portion 7 with the boot band 4, sealing between the boot 1 and the mount 6 and between the mount 6 and the outer race 3 is performed. A band groove 7c is formed on the outer periphery of the boot fixing portion 7 so that the boot band 4 can be fitted therein.

The mount 6 is usually made of rubber or a resin having a high elasticity, preferably santoprene (thermoplastic elastomer), chloroprene rubber, or the like. Of course, the material is not limited to this. The mount 6 includes a mount body 8 interposed between the outer ring 3 of the constant velocity joint and the boot fixing portion 7, and a flange-shaped end stopper 9 located outside the boot fixing portion. End stopper 9
Is an annular or non-annular projection for preventing the mount 6 from coming into contact with the end surface of the boot fixing portion 7 and preventing the mount 6 from further entering the boot fixing portion 7.

The outer surface of the mount body 8 is CV.
The J boot 1 is fitted to the boot fixing portion 7, and the inner peripheral surface is fitted to the outer ring 3. The mount body 8 has a substantially cylindrical shape, but the inner peripheral surface thereof is preferably the same as the outer shape of the outer ring 3. That is, when the outer ring 3 has a substantially triangular cross-section like a tripod joint,
The cross-sectional shape of the inner peripheral surface of the mount body 8 is also preferably the same triangular shape. According to this, the sealability between the mount body 8 and the outer ring 3 can be improved.

On the outer peripheral surface of the mount body 8, a CV is attached.
A circumferential engagement groove 8a that fits with a circumferential projection 7a formed on the inner circumferential surface of the boot fixing portion 7 of the J boot 1 is formed. The number of the engaging grooves 8a and the number of protrusions 7a may be single or plural. When the CVJ boot 1 and the mount 6 are combined, the protrusion 7a of the boot fixing portion 7 and the engaging groove 8a of the mount main body 8 are engaged with each other to improve the sealing property, and the boot fixing portion 7 and the mount main body 8 are separated from each other. Prevent it from coming off easily. Therefore, the positional relationship between the mount 6 and the boot fixing portion 7 does not change even if the end stopper 9 is separated after the mount 6 is inserted into the boot fixing portion 7.

Further, an end stopper 9 of the mount body 8
The outer ring stopper 8 protruding inward is provided at the end opposite to
b is formed. Therefore, when the mount body 8 is fitted to the outer ring 3, the outer ring stopper 8b comes into contact with the end surface of the outer ring 3, so that the mount body 8 is positioned.

The end surface 5 of the boot fixing portion 7 is a surface (referred to as an inner end surface) 9a of the end stopper 9 facing the CVJ boot 1 side.
Is in contact with A protrusion 7b is formed along the circumferential direction on the end surface 5 of the boot fixing portion 7, and an engagement groove 9b is formed on the inner end surface 9a of the end stopper 9. Then, the engagement groove 9b and the protrusion 7b of the boot fixing portion 7 are engaged with each other,
When the mount 6 is incorporated into the boot fixing portion 7, the boot fixing portion 7 and the mount 6 are prevented from being displaced from each other in the radial direction. In addition, the number of the protrusions 7b and the engaging grooves 9b may be single or plural, and in some cases, they may not be provided.

In this embodiment, the protrusions 7a and 7b are provided on the boot fixing portion 7 side, and the engaging grooves 8a and 7b are provided on the mount 6 side.
Although 9b is provided, the relationship may be reversed. Further, both the boot fixing portion 7 and the mount 6 may be provided with engaging grooves and protrusions, respectively. Also, the boot fixing portion 7
The mount 6 may not be provided on the entire circumference of the mount 6 but may be provided on a part thereof. The engaging groove and the protrusion may be omitted.

Further, the end stopper 9 is provided with a notch 10. This notch 10 is provided at the end stopper 9
Is provided at a plurality of positions on the circumference or at the entire circumference at least radially inside the boot band and near the boundary with the mount body 8. For example, as shown in FIG. 2, a radial position corresponding to an outer peripheral surface of the mount body 8 (or an inner peripheral surface of the boot fixing portion 7) (a root of a portion of the end stopper 9 radially protruding from the mount body 8). The notch 10 is formed in the (part). The notch 10 is a surface (called an outer end surface) 9c of the end stopper 9 opposite to the inner end surface 9a.
Has a shape cut in the axial direction toward the inner end surface 9a. Here, the notch 10 is preferably provided over the entire circumference, but not limited to this, it may be provided only in a part in the circumferential direction.

Further, a chamfer 9d is formed at the open end of the inner peripheral surface of the end stopper 9. Therefore, since the opening of the end stopper 9 is guided when the mount body 8 is fitted to the outer ring 3, the fitting can be easily performed.

According to the boot mount 6 constructed as described above, it is mounted between the boot and the mating member in the following manner.

First, the mount 6 is fitted into the inner periphery of the boot fixing portion 7 of the CVJ boot 1. At this time, the mount 6 is inserted until the end surface 5 of the boot fixing portion 7 contacts the end stopper 9 of the mount 6. Then, the relative position between the CVJ boot 1 and the mount 6 is determined. At the same time, the protrusions 7 a and 7 b of the boot fixing portion 7 are engaged with the engaging grooves 8 of the mount 6.
It engages with a and 9b. This reliably prevents the relative positions of the CVJ boot 1 and the mount 6 from being displaced in the axial direction and the circumferential direction.

Next, the mount 6 is fitted to the outer ring 3 in a state where the CVJ boot 1 and the mount 6 are combined. Then, after the CVJ boot 1 is fitted into the outer ring 3 at a predetermined position, the boot band 4 is fitted into the band groove 7c of the boot fixing portion 7 and the boot fixing portion 7 is tightened together with the mount 6. After that, as shown by the imaginary line in FIG.
When it is bent or picked by a finger or the like and pulled, the rigidity is smallest in the notch 10 at the base of the end stopper 9, so that the portion outside the notch 10 is peeled off and separated from the mount body 8. The separated end stopper 9 is further removed from the outer ring 3. Thereby, CV
The installation of J boots 1 is completed.

Not only the above-described mounting procedure but also the CVJ boot is assembled in advance before the CVJ boot is assembled to the mating component.
With the mount 6 fitted to the boot 1, the end stopper 9 may be peeled off and separated. Then, after that, a procedure of fitting the mount body 8 to the outer ring 3 may be used. Even in this case, the positional relationship between the mount 6 and the boot fixing portion 7 does not change due to the engaging projections 7a and the grooves 8a.

Therefore, according to the present embodiment, when the mount 6 is incorporated in the boot fixing portion 7, the end stopper 9 is used.
Functions as a protrusion for preventing the mount from entering deeply, but after being assembled, the upper part (outer side) of the notch 10 is peeled off to be separated from the mount 6.
Therefore, even if the constant velocity joint 2 rotates at a high speed, there is no end stopper 9 that projects radially outward from the boot fixing portion 7 or the boot band 4 located on the outermost periphery, and the constant velocity joint 2 interferes with other structures. There is no. Moreover, since the mount body 8 is entirely left, the sealing performance does not deteriorate.
Even if the mount main body 8 is slightly chipped when the end stopper 9 is cut off, most of the mount main body 8 remains, so that the sealability is not affected. Further, since the end stopper 9 is removed after the mounting of the mount 6 to reduce the weight, the overall weight of the boot assembly can be reduced.

The above embodiment is an example of the preferred embodiment of the present invention, but the present invention is not limited to this, and various modifications can be made without departing from the gist of the present invention. For example, in the present embodiment, the formation position of the notch 10 is the base of the end stopper 9 on the outer end surface 9c side, but the position is not particularly limited to this position. At least a position on the inner peripheral side of the outermost peripheral member (usually the boot band 4) in the boot fixing portion 7 of the end stopper 9, for example, on the inner side in the radial direction of the boot band diameter and near the boundary with the mount body 8. It is effective if it is provided at a position in between. The point is that the end stopper 9 does not project outside the boot bunt 4 and the boot fixing portion 7 during high-speed rotation, and the mount body 8
If most of the above remains and the sealing performance is not deteriorated, the notch 10 may be provided in the other part.

For example, as shown in FIG. 3, the notch 10
May have a shape that is axially cut from the root of the end stopper 9 on the inner end surface 9a side. Further, as shown in FIG. 4, the notch 10 is formed on the inner end surface 9 a of the end stopper 9.
The shape may be such that the base on the side and the base on the outer end surface 9c side are cut so as to approach each other.

Further, as shown in FIG. 5, the notch 10
May have a shape cut in the radial direction from the vicinity of the base of the end stopper 9 on the inner end surface 9a side. FIG.
As shown in, the notch 10 may have a shape that is cut in the radial direction from a position near the inner end surface 9a of the inner peripheral surface of the mount body 8. Further, as shown in FIG. 7, the notch 10 is formed so as to face each other from the vicinity of the root of the end stopper 9 on the inner end surface 9a side and the position of the inner peripheral surface of the mount body 8 close to the inner end surface 9a. It may be shaped.

Further, the various cutouts 10 described above.
May be combined. For example, as shown in FIG. 8, the notch 10 axially cut from the root of the end stopper 9 on the outer end surface 9c side and the radial direction from a position close to the inner end surface 9a of the inner peripheral surface of the mount body 8. It may be provided with a notch 10 that is cut along it. Of course, the shape of the notch 10 is a wedge shape in which stress concentration is likely to occur in order to make it easy to cut, but the shape is not particularly limited thereto.

[0029]

As is apparent from the above description, the boot mount according to the present invention is deeply inserted so that the end surface of the boot fixing portion comes into contact with the outside of the mount body interposed between the mating member and the boot fixing portion. An end stopper for prevention is provided, and notches are provided at a plurality of positions on the circumference or at the entire circumference at least radially inside the boot band of the end stopper and near the boundary with the mount body. Therefore, after the mount is assembled into the boot fixing portion using the end stopper, the end stopper outside the cutout can be separated from the mount body by pulling the end stopper. Therefore, after assembling the boot, only the mount body with the end stopper separated is interposed between the mating member and the boot fixing portion, and a part of the mount receives the centrifugal force during high-speed rotation. It does not protrude outside the band and interfere with it. Moreover, the weight of the mount itself is reduced, and the mounting weight is reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state in which a boot mount of the present invention is provided between a constant velocity joint and a CVJ boot.

FIG. 2 is a cross-sectional view showing a state in which the boot mount of the present invention is fitted to a CVJ boot.

FIG. 3 is a sectional view showing a state in which another mount of the present invention is fitted to a CVJ boot.

FIG. 4 is a sectional view showing a state in which another mount of the present invention is fitted to a CVJ boot.

FIG. 5 is a sectional view showing a state in which another mount of the present invention is fitted to a CVJ boot.

FIG. 6 is a sectional view showing a state in which another mount of the present invention is fitted to a CVJ boot.

FIG. 7 is a sectional view showing a state in which another mount of the present invention is fitted to a CVJ boot.

FIG. 8 is a sectional view showing a state in which another mount of the present invention is fitted to a CVJ boot.

FIG. 9 is a cross-sectional view showing a state in which a conventional boot mount is fitted to a CVJ boot.

[Explanation of symbols]

 1 CVJ boots (boots) 2 constant velocity joint (counterpart member) 5 end face of boot fixing part 6 mount 7 boot fixing part 8 mount body 9 end stopper 10 notch

Claims (1)

[Claims] 1. A boot mount interposed between a mating member to which a boot is attached and a boot fixing portion of the boot, wherein the mount body is interposed between the mating member and the boot fixing portion. Is provided with an end stopper for preventing penetration into which the end surface of the boot fixing portion abuts, and the circumference of the end stopper is at least radially inside the boot band diameter and near the boundary with the mount body. A boot mount characterized by notches provided at multiple locations or around the entire circumference.