JP3114932B2 - Bellows formation method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for protecting a long shaft by protecting one end of the shaft by fixing one end on the shaft and the other end to a cylindrical mounting portion having a larger diameter than the shaft. it relates a method of forming the bellows that are used as a cover or the like.

[0002]

2. Description of the Related Art FIG. 3 is a longitudinal sectional view of a conventional bellows. The bellows is made of an elastic material such as rubber or elastomer, and has a bellows portion 12, a small-diameter mounting portion 13 at one end,
The large-diameter mounting portion 14 at the other end is integrally formed. This bellows is used in such a manner that the small-diameter mounting portion 13 is fixed at a predetermined position on the elongated shaft and the large-diameter mounting portion 14 is fixed to the cylindrical mounting portion. Therefore, when the bellows is mounted, Thus, the shaft is passed through the bellows portion 12 in the axial direction.

[0003]

In the above-mentioned prior art, when the bellows is elongated in the axial direction, the central portion of the bellows portion is bent downward by its own weight, and the inner surface of the central portion passes through the inside of the bellows portion. There is a fear that an accident may occur in which the shaft extends in the axial direction and wears or breaks, or an outer surface of the bent central portion contacts with a peripheral member to wear or break. In particular, when the shaft reciprocates, the bellows are compressed in the axial direction and meander,
There is a great risk that the bellows will be worn by contact with the shaft and surrounding members, and if the shaft rotates, the bellows will sway due to centrifugal force, and the shaking will cause the bellows to be attached to the surrounding members. There is a great risk of being worn by contact.

Further, in the prior art, the bellows to be used for a certain device are specially manufactured in a size required each time according to the length required for the device. Therefore, there is a disadvantage that the production cost is increased when a small amount of bellows is produced without requiring many bellows. The present invention aims to provide a method of forming such a bellows that solve the conventional problems.

[0005]

SUMMARY OF THE INVENTION The present invention is directed to a bellows which surrounds an elongated shaft, one end of which is fixed on the shaft, and the other end of which is fixed to a cylindrical mounting portion having a larger diameter than the shaft .
In the method for forming a small-diameter mounting portion adapted to be closed and fitted to the shaft some inner diameter of larger diameter than the diameter of said shaft, and a large bellows part of the diameter than the small-diameter attaching portion, the small diameter mounting portion A connecting portion for connecting the bellows with one end in the axial direction, and a bellows
Provided at the other end in the axial direction of the portion, and on the cylindrical mounting portion.
A large-diameter mounting portion having an inner diameter that can be fitted
Bellows member
Can be fitted inside the bellows of another bellows member
A plurality is formed in such a dimensional relationship, and the bellows member
A desired number of bellows members from which the large-diameter mounting portion has been cut and removed,
One bellows member without cutting and removing the large diameter mounting part
Around the connection of one bellows member to another
To be fitted inside the bellows of the rose member, and
The one bellows portion without cutting and removing the large-diameter mounting portion
The large-diameter mounting portion of the material constitutes the other end of the bellows.
And the bellows of the desired length are connected in the axial direction.
The above-mentioned conventional problems are solved by providing a bellows forming method characterized in that the bellows are formed .

[0006]

According to the method for forming a bellows of the present invention, an elongated shaft is provided.
And one end is fixed on the shaft, and the other end is
Bellows fixed to a cylindrical mounting part with a diameter larger than the shaft of
Forming a plurality of bellows members,
To connect these bellows members in the axial direction.
It is. When connecting, use a large diameter
The desired number of bellows members with the attached parts cut off and large diameter mounting
One bellows member whose part has not been cut and removed, the outer periphery of the connection part of one bellows member is fitted inside the other one bellows member, and the large-diameter mounting part is cut off
The large-diameter mounting portion of the one bellows member not removed is
This is performed so as to constitute the other end of the bellows. Therefore, by connecting a desired number of these bellows members, a bellows having a desired length can be formed. Also, at the time of the connection, one bellows member having the large-diameter mounting portion is located at one end of the formed bellows, so that one end of the bellows mounted around the shaft is large. The diameter mounting portion can be easily fixed to the cylindrical mounting portion.

The bellows may be mounted around the shaft after the plurality of bellows members have been connected, or may be connected while sequentially connecting the bellows members. The mounting is performed such that the small-diameter mounting portion of each bellows member is fitted on the shaft. Therefore,
The bellows formed by connecting the bellows members, which have been mounted around the shaft, are supported such that the bellows portion is separated from the shaft at the position of the small diameter mounting portion and the connection portion of each bellows member. Will be. Accordingly, the bellows of the bellows is always held without deflection and with little shaking.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view of a bellows member as a unit unit, and FIG. 2 is a longitudinal sectional view of a bellows formed by connecting a plurality of bellows members. Shown in the figure
Method of forming a bellows embodiment, which the bellows member 3 shown in FIG. 1 the unit unit and plurality connecting this
It is . At one end of the bellows member 3 as a unit, a small-diameter mounting portion 4 having an inner diameter slightly larger than the diameter of the shaft 7 and a bellows portion 1 having a larger diameter than the small-diameter mounting portion 4 are provided.
And a connecting portion 5 for connecting the small-diameter mounting portion 4 and one end of the bellows portion 1 in the axial direction. Bellows member 3
Is provided with a large-diameter mounting portion 2 having an inner diameter such that the large-diameter mounting portion 2 can be mounted and fitted on the cylindrical mounting portion 8.
Bellows part 1, small diameter attachment part 4, connection part 5, and large diameter attachment part 2
Is integrally formed of a material such as rubber or elastomer.

FIG. 2 shows a bellows 11 formed by connecting a plurality of bellows members. Among the bellows members used in the bellows 11, the bellows 11 is adjacent to the cylindrical mounting portion 8. The bellows member 3 has the perfect shape as shown in FIG. 1, and the other bellows member has the bellows portion 1 of the bellows member 3 placed in a plane A-A perpendicular to its axis.
The large-diameter mounting portion 2 is cut off by cutting at a distance. In these bellows members, FIG.
Since the parts corresponding to the same parts as the bellows member 3 as the unit unit are denoted by reference numerals a, b, and c attached to the reference numerals in FIG. 1, these parts will not be described repeatedly.

The large-diameter mounting portion 2 of the complete bellows member 3 on the rightmost side in FIG. 2 is fitted into the cylindrical mounting portion 8 with an appropriate sealing member 9 interposed therebetween if necessary. Diameter mounting part 2
Is fixed by tightening a band (not shown) attached to the outside of the. The bellows member on the left of the bellows member 3 fits the end 6 of the cut bellows portion 1c to the outer periphery of the connecting portion 5 of the bellows member 3 and uses an appropriate adhesive as necessary. Fixed. Bellows member 3
The shaft 7 is inserted into the small-diameter mounting portion 4 and the small-diameter mounting portion 4c of the bellows member on the left side, and the small-diameter mounting portions 4 and 4c are not fixed to the shaft 7 but can slide with respect to the shaft 7. Keep it. Also, the bellows member on the left side is similar to the above,
The end portion 6 of the bellows portion 1b is fitted and fixed to the outer periphery of the connecting portion 5c, and the small-diameter mounting portion 4b is inserted into the shaft 7, and the small-diameter mounting portion 4b is not fixed to the shaft 7, 7
It is slidable with respect to.

The bellows member located on the leftmost side in FIG. 2 is also connected in the same manner as described above, but the small-diameter mounting portion 4a of this bellows member is not slidable with respect to the shaft 7;
At a predetermined position. As a fixing means, an appropriate sealing member 10 is interposed between the shaft 7 and the small-diameter mounting portion 4a as necessary, and a band (not shown) is mounted outside the small-diameter mounting portion 4a, and the band is tightened. Is performed by

In the illustrated embodiment, since the bellows 11 is formed as described above, the bellows portion 1 of the bellows 11 is formed.
a, 1b, 1c, 1 and the shaft 7 are between the bellows 1a, 1
b, 1c, 1 at the intermediate portion, small-diameter mounting portions 4b, 4c,
4 and the connecting portions 5b, 5c, 5
The distance between a, 1b, 1c, 1 and the shaft 7 is regulated. Therefore, the valley of the bellows does not come into contact with the shaft 7, and the peak of the bellows does not come into contact with the surrounding members.

[0013]

According to the present invention, an arbitrary number of bellows members are connected in the axial direction to form a bellows having a desired length, so that the manufacturing cost of the bellows can be greatly reduced. In addition, it is possible to avoid such a problem that the bellows of the bellows attached to the shaft is bent and comes into contact with the shaft and surrounding members.

[Brief description of the drawings]

[1] used in the bellows forming method according to an embodiment of the present invention
It is a longitudinal cross-sectional view which shows the bellows member as a unit unit used .

FIG. 2 is a longitudinal sectional view showing a bellows formed by connecting a plurality of bellows members based on the embodiment .

FIG. 3 is a longitudinal sectional view showing a conventional bellows.

[Explanation of symbols]

 1, 1a, 1b, 1c Bellows part 2 Large diameter attachment part 3 Bellows member as unit unit 4, 4a, 4b, 4c Small diameter attachment part 5, 5a, 5b, 5c Connection part 6 End of cut bellows part 7 Shaft 8 Cylindrical mounting part 9,10 Sealing member 11 Bellows

Claims (1)

(57) [Claims] 1. A method of forming a bellows that surrounds an elongated shaft, one end of which is fixed on the shaft, and the other end of which is fixed to a cylindrical mounting portion having a larger diameter than the shaft. fitted to the shaft also have a somewhat inner diameter of the large diameter
A small-diameter mounting portion, a bellows portion having a larger diameter than the small-diameter mounting portion, a connecting portion connecting the small-diameter mounting portion and one axial end portion of the bellows portion, and another axial end of the bellows portion Department
Provided so that it can be fitted on the cylindrical mounting portion.
A bellows member having a large-diameter mounting portion having an inner diameter;
The outer circumference of the connection between one bellows member and another bellows
The dimensional relationship is such that it fits inside the bellows of the member.
And a desired number obtained by cutting and removing a large-diameter mounting portion from the bellows member.
The bellows member and the large-diameter mounting part are not cut and removed.
One bellows member and the connection of one bellows member
The outer circumference is fitted inside the bellows of another bellows member
Before cutting and removing the large-diameter mounting part.
The large-diameter mounting portion of one bellows member is the other of the bellows described above.
To form an end and connect in the axial direction
Vero, characterized in that to form a more desired lengths of the bellows
Method of forming the dose .