JP2001179549A - Press-in fitting member and pipe product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a press-in fitting member to be easily and securely inserted into a pipe material with a small pressure, and to provide a pipe product, into which the press-in fitting member is pressed for fitting. SOLUTION: In a pipe material 1, a peripheral edge of a tip of a flange part 3 is formed with two stages of a base end side chamfering part 4 formed at 0.3 or less of a ratio w/h of the chamfering height(h) and the chamfering width(w) and formed at 0.15 mm or more of the chamfering width, and a tip side chamfering part 5 formed with a chamfering angle larger than that of the base end side chamfering part 4. With this structure, degree of sharpness of a bend part 6 of the base end side chamfering part 4 is appropriately relaxed, and a press-in fitting member 2 can be easily and securely inserted into the pipe material 1, and while insertion of the chamfering part 5 is effectively guided, a tip of the press-in fitting member 2 can be easily inserted into the pipe material 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press-fitting member such as a bearing for press-fitting a pipe material used for a photosensitive drum, a magnet roller or the like of a copying machine, a printer or the like, and the press-fitting member for the pipe material. The present invention relates to a press-fitted pipe product.

[0002]

2. Description of the Related Art
As shown in FIG. 7, a press-fit fitting member (52) such as a bearing press-fit to a pipe material (51) used for a photosensitive drum, a sleeve, or the like of a copying machine, a printer, or the like. A large-diameter flange portion (53) is formed at one end, and a chamfered portion (5
What formed 4) is known. According to this, before the press-fitting member (52) is press-fitted into the pipe material (51), the leading end of the press-fitting member (52) is connected to the open end of the pipe material (51). At the stage of insertion from the portion, the chamfered portion (54) of the flange portion (53) functions as an insertion guide along the opening end of the pipe material (51), so that the distal end of the press-fitting member (52). Can be easily inserted into the pipe member (51). If the chamfer angle of the chamfered portion (54) is small, the above-described function of guiding the insertion of the chamfered portion (54) is not sufficiently exhibited, and the tip of the press-fitting member (52) is connected to a pipe material ( 51), the chamfered angle of the chamfered portion (54) of the conventional press-fitting member (52) is formed at an angle of about 45 degrees or more.

However, if the chamfer angle of the press-fitting member (52) is set to 45 degrees or more as described above, the sharpness of the bent portion (55) of the chamfered portion (54) becomes sharp, so The bend (5) of the chamfer (54)
Since a large resistance was generated between 5) and the pipe material (51), and a large press-fitting pressure against the resistance was required,
There is a problem in that the press-fitting pressure is required to increase the size of the equipment and increase the manufacturing cost. Further, recently, since the pipe material (51) used for the photosensitive drum, the sleeve, and the like is formed to be thin, if too large pressure is applied at the time of press-fitting, the pipe material (51) may be deformed such as buckling. Press-fitted pipe member (51) and press-fitted fitting member (52)
There is also a problem that both axes are shifted. Further, at the time of press-fitting, the inner surface of the pipe material (51) is cut into a sharp bent portion (55) of the chamfered portion (54), and the shavings are formed with the pipe material (51) and the press-fit fitting member (52) as the press-fitting proceeds. ) And leak out from the open end of the pipe member (51).

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has a press-fit fitting member which can be easily inserted into a pipe material and can be easily and reliably press-fitted into the pipe material with a small pressure. It is another object of the present invention to provide a pipe product whose press-fitting member is press-fitted into a pipe material.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a press-fitting member having a property that it can be easily inserted into a pipe material when the chamfer angle is large and a chamfer when the chamfer angle is small. There is a method that focuses on the property that the sharp angle of the bent portion of the portion becomes small, and it is easy to press-fit into the pipe material.

That is, the present invention provides a press-fitting member in which a plurality of chamfers having different chamfer angles between adjacent ones are formed in multiple stages in the axial direction on the periphery of an end portion to be press-fitted into a pipe material. The ratio w / h of the chamfering height h to the chamfering width w in the most chamfered portion of the chamfered portion is 0.3 or less, and the chamfering width w is 0.1 or less.
The chamfered portion is formed to be 5 mm or more, and the chamfered angle at the most chamfered portion on the distal end side is larger than the chamfered angle of the chamfered portion on the base end side.

[0007] According to this, the chamfering height h and the chamfering width w at the most proximal chamfered portion among the chamfered portions.
Is less than 0.3 and the chamfer width w is 0.15 m
Since the sharpness of the base end chamfered portion is moderately reduced by being formed to m or more, the press-fitting fitting member can be easily and reliably press-fitted to the pipe material with a small pressure. Further, since the chamfer angle at the most distal chamfer is formed to be larger than the chamfer angle of the basal chamfer at the base end, the insertion guide of the chamfer can be effectively performed, and the press-fitting can be performed. It becomes easy to insert the tip of the fitting member into the pipe material.

In a pipe product in which the press-fitting member has the chamfered end formed by press-fitting into the inside of a pipe material, the press-fitting member is press-fitted to the pipe material with a small press-fitting pressure. Since the members are press-fitted, deformation of the pipe material such as buckling or the like is prevented, and both axes of the pipe material and the press-fitting member after press-fitting are prevented from being displaced. A high quality pipe product with almost no swarf is obtained.

In the present invention, the chamfer angle means an angle formed by the chamfered portion with respect to the axial direction of the press-fitting member, and the chamfering height means a length of the chamfered portion in the axial direction of the press-fitting member. In other words, the chamfer width means a length of the chamfered portion in a direction perpendicular to the axial direction of the press-fitting member.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment in which the present invention is applied to a magnet roller used in a copying machine or a printer will be described in detail with reference to FIGS.

In these figures, (A) is a magnet roller used in a copying machine or a printer. The magnet roller (A) is formed by a rod-shaped pipe member (1) and a total of two press-fitting members (2) and (2) press-fitted at both ends in the length direction.

The pipe member (1) is formed by cutting an aluminum extruded pipe member having a hollow portion into a predetermined length. The wall thickness and the outer diameter of the pipe material (1) have a relationship of wall thickness / diameter ≦ 0.1.

On the other hand, the press-fitting member (2) is formed by cutting an aluminum extruded pipe material having a hollow portion into a predetermined length, and then processing one end portion into a bulging shape. The part is press-fitted into the pipe member (1), and the other end is connected to another member such as a copy machine as a bearing. The press-fitting member (2) has a hardness equal to or higher than that of the pipe material (1), and has a surface roughness of Ra 0.2 to 0.8.

The flange portion (3) of the press-fitting member (2) has a diameter of 0.005 mm or more from the inner diameter of the pipe material (1) in order to securely press-fit the pipe material (1).
It is formed in a cylindrical shape having an outer diameter as large as about 0.060 mm. As shown in FIG. 2, chamfered portions (4) and (5) having different chamfer angles are formed in two stages in the axial direction on the periphery of the distal end of the flange portion (3). Of the chamfers (4) and (5), the proximal chamfer (4)
As shown in FIG. 4, the ratio w / h of the chamfering height h to the chamfering width w is 0.3 or less and the chamfering width w is 0.15 mm or more, while the tip chamfering portion (5) is formed. The chamfer angle is larger than the chamfer angle of the base end chamfer (4), for example, about 45 degrees. In the present invention, the chamfer angle means an angle formed by the chamfered portions (4) and (5) with respect to the axial direction of the press-fitting member (2).
The chamfering height h refers to the length in the axial direction of the press-fitting member (2) at the base end chamfer (4), and the chamfering width w refers to the press-fitting at the base chamfer (4). Member (2)
Means the length in the direction perpendicular to the axial direction.

Thus, in the base side chamfered portion (4), the ratio w / h of the chamfer height h to the chamfer width w is formed to be 0.3 or less and the chamfer width w is formed to be 0.15 mm or more. As a result, the sharpness of the bent portion (6) on the proximal side of the proximal end chamfer (4) is moderately moderated, so that the press-fitting member (2) can be easily fitted into the pipe material (1) with a small press-fitting pressure. And it can press-fit reliably. Further, since the chamfer angle of the distal chamfer (5) is formed to be larger than the chamfer angle of the base chamfer (4), the function of guiding the insertion of the chamfer is sufficiently exhibited. It becomes easy to insert the tip of the press-fitting member (2) into the pipe material (1).

The inside of the press-fitting member (2) is
As shown in FIG. 3, a cylindrical hollow portion (7) is formed from the other end to the flange portion (3) so as to substantially correspond to the outer shape, and the cylindrical hollow portion is formed in the flange portion (3). It is formed in a truncated cone-shaped hollow portion (8) whose diameter gradually increases from the portion (7) toward the opening end, and forms a cylindrical hollow portion (9) from the truncated cone-shaped hollow portion (8) to the opening end. Is formed. Further, a step (10) is formed on the base end surface (3a) of the flange portion (3) of the press-fitting member (2) for convenience in forming the flange portion (3).

Next, a method of manufacturing the magnet roller (A) of the embodiment shown in FIG. 1 will be described.

First, the axes of the pipe member (1) and the press-fitting member (2) are made substantially coincident with each other, and the front end chamfered part (5) of the press-fitting member (2) is fitted on the inner surface of the end of the pipe member (1). While inserting the distal end of the press-fitting member (2) into the inside of the pipe member (1), and further attaching the chamfered portion of the base side chamfered portion (4) to the inner surface of the end portion of the pipe member (1). The insertion of the press-fitting member (2) is advanced while moving along. At this time, since the chamfer angle of the distal end chamfered portion (5) of the press-fitting member (2) is formed at an angle (about 45 degrees) larger than the chamfered angle of the base end chamfered portion (4), Beveling part (5)
The function of the insertion guide is sufficiently exhibited, and it becomes easy to insert the tip of the press-fitting member (2) into the pipe material (1).

Thereafter, when the press-fitting member (2) is pressed against the pipe material (1) in the axial direction as it is, the flange portion (3) of the press-fitting member (2) gradually becomes smaller. ) Is press-fitted into the flange portion (3).
The whole is completely press-fitted inside the pipe material (1), and press-fit when the base end face (3a) of the flange portion (3) of the press-fitting fitting (2) and the end face (1a) of the pipe material (1) coincide. The press-fitting operation of the fitting member (2) ends. At this time, in the base end chamfer (4), the ratio w / h of the chamfer height h to the chamfer width w is 0.3 or less, and the chamfer width w is 0.15 mm.
By being formed as described above, the proximal end chamfer (4)
Since the degree of sharpness of the bent portion (6) is moderately moderated, the press-fitting member (2) is connected to the pipe material (1) with a small pressure.
Can be easily and reliably press-fitted.

Thus, if the other press-fitting member (2) is press-fitted into the opening at the other end of the pipe material (1) in the same manner as described above, the pipe material (1) will not deform such as buckling. Wake up,
A high-quality magnet roller (A) that prevents both axes of the pipe member (1) and the press-fitting member (2) after the press-fitting from being displaced and hardly generates shavings at the time of the press-fitting. can get. If necessary, the joint between the pipe member (1) and the press-fitting member (2) may be welded by friction welding or the like, or may be bonded with an adhesive to further join the two members (1) and (2). It may be strong.

In the above embodiment, the chamfered portion of the press-fitting member (2) is formed in two steps. However, the present invention is not limited to this, and may be formed in multiple steps.

Although the base side chamfer (4) on the base side is formed to have a straight vertical section, it may be formed to have a curved vertical section as shown in FIG.

Also, one end of the press-fitting member (2) to be press-fitted is formed in a bulging shape, and chamfered portions (4) and (5) are formed on the peripheral edge of the front end of the flange portion (3). The chamfers (4) and (5) may be directly formed on the peripheral edge of the tip of the press-fitting member (2) without forming one end of the press-fitting member (2) in a bulging shape.

Although aluminum is used as the material of the pipe member (1) and the press-fitting fitting member (2), for example, an iron-based material other than aluminum may be used, or the pipe member (1) and the press-fitting member (2) may be press-fitted. The fitting member (2) may be formed of a different material.

[0025]

According to the first aspect of the invention, the ratio w / h of the chamfering height h to the chamfering width w at the most proximal chamfered portion among the chamfered portions is 0.3 or less, and Since the chamfer width w is formed to be 0.15 mm or more, the sharpness of the base end chamfer is moderately moderated, so that the press-fit fitting member is easily and reliably press-fitted to the pipe material with a small press-fit pressure. Can be combined. For this reason, it is possible to prevent the pipe material from being deformed such as buckling at the time of press-fitting, to prevent the axes of both members from being shifted, and to cut the inner surface of the pipe material into the bent portion of the chamfered portion. It is possible to prevent the generation of shavings and to reduce the scale and manufacturing cost of equipment required for press-fitting.

Further, since the chamfer angle at the most chamfered portion on the distal end side is formed to be larger than the chamfered angle of the chamfered portion on the base end side, the function of inserting and guiding the chamfered portion is sufficiently exhibited, and the press-fitting is performed. It is easy to insert the distal end of the fitting member into the pipe material, and work efficiency is improved.

According to the second aspect of the present invention, since the press-fitting member is press-fitted to the pipe material with a small press-fitting pressure, the pipe material may be deformed such as buckling, or the pipe material after press-fitting. A high-quality pipe product is obtained in which the two axes of the press-fitting member and the press-fitting member are prevented from being displaced from each other, and hardly generates shavings at the time of press-fitting.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a magnet roller according to an embodiment of the present invention separated into a pipe member and a press-fitting member.

FIG. 2 is a side view of the press-fitting member of FIG.

FIG. 3 is a longitudinal sectional view of the press-fitting member of FIG.

FIG. 4 is an enlarged view of a portion I in FIG. 2;

FIG. 5 is a sectional view showing a magnet roller in which a press-fitting fitting member is press-fitted into a pipe material.

FIG. 6 is an enlarged view of a main part of a press-fitting member according to another embodiment of the present invention.

FIG. 7 is a sectional view showing a conventional magnet roller.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Pipe material 2 ... Press-fit fitting member 3 ... Flange part 4 ... Base end chamfered part 5 ... Tip chamfered part 6 ... Bent part

Claims (2)

[Claims] 1. A press-fitting fitting member in which a plurality of chamfers having different chamfer angles between adjacent ones are formed in multiple stages in an axial direction on a periphery of an end portion to be press-fitted into a pipe material, In the chamfer on the most proximal side of the chamfers,
The ratio w / h of the chamfering height h to the chamfering width w is formed to be 0.3 or less, and the chamfering width w is formed to be 0.15 mm or more. The press-fitting member is formed at an angle larger than the chamfer angle of the chamfer on the side. 2. A pipe product, wherein the press-fitting member according to claim 1 is formed by press-fitting an end having the chamfered portion into a pipe material.