JP2009051006A - Press-fitting member and pipe product - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a press-fitting member which can be easily inserted into a pipe material and be easily and reliably pressed into the pipe material with low pressure, and a pipe product with the press-fitting member press-fitted therein. <P>SOLUTION: A flange section 3 of the pipe material 1 has a double-stepped structure formed at its circumferential edge, which comprises a base end chamfered portion 4 whose ratio w/h of its chamfer width "w" to its chamfer height "h" is 0.3 or less where the chamfer width "w" is 0.15 mm or more and a distal end chamfered portion 5 greater in chamfer angle than the base end chamfered portion 4. This appropriately mitigates the degree of steepness of a bent part 6 of the base end chamfered portion 4 to allow the press-fitting member 2 to be easily and reliably press-fitted into the pipe material 1 with low pressure, and helps the chamfered portion 5 to effectively serve as an insertion guide to facilitate the insertion of the front end of the press-fitting member 2 into the pipe material 1. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

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

Conventionally, as a press-fitting fitting member (52) such as a bearing that is press-fitted to a pipe member (51) used for a photosensitive drum, a sleeve or the like of a copying machine or a printer, as shown in FIG. ) Having a large-diameter flange portion (53) formed at one end thereof, and a chamfered portion (54) formed at the peripheral edge of the front end of the flange portion (53) is known. According to this, it is a stage before press-fitting the press-fitting fitting member (52) into the pipe material (51), and the tip of the press-fitting fitting member (52) is used as the open end of the pipe material (51). Since the chamfered portion (54) of the flange portion (53) serves as an insertion guide along the opening end portion of the pipe material (51) in the stage of insertion from the portion, the distal end portion of the press-fitting fitting member (52) Can be easily inserted into the pipe material (51). If the chamfering angle of the chamfered portion (54) is small, the insertion guide function of the chamfered portion (54) as described above is not sufficiently exerted, and the tip end portion of the press-fitting fitting member (52) is connected to the pipe material ( 51), the chamfering angle of the chamfered portion (54) of the conventional press-fitting fitting member (52) is formed at an angle of about 45 degrees or more.
Japanese Patent Laid-Open No. 06-262447 Japanese Utility Model Publication No. 07-001378 Japanese Patent Laid-Open No. 10-227944

  However, when the chamfering angle of the press-fitting fitting member (52) is set to 45 degrees or more as described above, the chamfered portion (54) is sharpened at the bend (55), so that the chamfered portion is pressed during press-fitting. Since a large resistance is generated between the bent portion (55) of (54) and the pipe material (51) and a large press-fitting pressure is required for the resistance, the equipment is enlarged and the manufacturing cost is required to realize the press-fitting pressure. There was a problem of inviting an increase. In addition, since the pipe material (51) used for the photosensitive drum and the sleeve has been formed thin recently, if the pipe member (51) is deformed by buckling or the like when a large pressure is applied during press-fitting. There is also a problem that both axes of the pipe material (51) and the press-fitting fitting member (52) after press-fitting are displaced. Furthermore, the inner surface of the pipe material (51) is shaved into a sharp bent portion (55) of the chamfered portion (54) during the press-fitting, and the shavings are pushed into the pipe material (51) and the press-fitting fitting member (52). ) Dive into the contact surface, and leak out from the open end of the pipe material (51).

  The present invention has been made in view of the above-described problems, and is a press-fitting fitting member that can be easily inserted into a pipe material with a small pressure and that can be easily and reliably press-fitted into the pipe material, and the press-fitting thereof. An object is to provide a pipe product in which a fitting member is press-fitted into a pipe material.

  In order to achieve the above object, the present invention is characterized in that when the chamfering angle of the press-fitting fitting member is large, it is easy to insert into the pipe material, and when the chamfering angle is small, the cusp angle of the bent portion of the chamfered portion is small. Therefore, there is one that pays attention to the property of being easily press-fitted into the pipe material.

  That is, this invention is a press-fitting fitting member in which a plurality of chamfered portions having different chamfering angles between adjacent ones are formed in multiple stages in the axial direction on the periphery of an end portion press-fitted to a pipe material. In the chamfered portion on the most proximal side among the chamfered portions, the ratio w / h of the chamfered height h to the chamfered width w is 0.3 or less and the chamfered width w is 0.15 mm or more. In the most chamfered portion, the chamfer angle is formed to be larger than the chamfer angle of the base end chamfer portion.

  According to this, in the chamfered portion on the most proximal side among the chamfered portions, the ratio w / h between the chamfered height h and the chamfered width w is 0.3 or less, and the chamfered width w is 0.15 mm or more. By doing so, the degree of sharpness of the base end side chamfer is moderated moderately, so that the press-fitting member can be easily and surely press-fitted to the pipe member with a small pressure. In addition, since the chamfering angle is formed at an angle larger than the chamfering angle of the chamfered portion on the proximal end side in the most chamfered portion, the insertion guide of the chamfered portion can be effectively performed, and press fitting is performed. It becomes easy to insert the tip of the fitting member into the pipe material.

  In addition, when the press-fitting member is a pipe product in which the end portion where the chamfered portion is formed is press-fitted into the pipe material, the press-fitting member is press-fitted into the pipe material with a small press-fitting pressure. Since it is fitted, it is possible to prevent deformation of the pipe material such as buckling, and misalignment of both axes of the pipe material after press-fitting and the press-fitting fitting member. A high-quality pipe product with little occurrence is obtained.

  In the present invention, the chamfering angle refers to the angle formed by the chamfered portion with respect to the axial direction of the press-fitting fitting member, and the chamfering height refers to the length in the axial direction of the press-fitting fitting member at the chamfered portion. The width refers to the length in the direction perpendicular to the axial direction of the press-fitting member at the chamfered portion.

  According to the first aspect of the present invention, in the most proximal chamfered portion among the chamfered portions, 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. Since the sharpness of the side end chamfered portion is moderately relaxed by being formed to be 15 mm or more, the press-fitting member can be easily and surely press-fitted to the pipe material with a small press-fitting pressure. . For this reason, it is possible to prevent the pipe material from being deformed such as buckling during the press-fitting, and to prevent the axial lines of both members from shifting, and the inner surface of the pipe material is cut into the bent portion of the chamfered portion. Therefore, the generation of shavings can be prevented, and the scale and manufacturing cost of equipment necessary for press-fitting can be reduced.

  Further, since the chamfering angle is formed to be larger than the chamfering angle of the chamfered portion on the proximal end side in the chamfered portion on the most distal end side, the function of insertion guide of the chamfered portion is sufficiently exhibited, and the press-fitting fitting member It becomes easy to insert the tip of the pipe member into the pipe material, and the working efficiency is improved.

  According to the second aspect of the present invention, since the press-fitting fitting member is press-fitted to the pipe material with a small press-fitting pressure, the pipe material causes deformation such as buckling or the press-fitting with the pipe material after press-fitting. It is possible to obtain a high-quality pipe product in which the shafts of the combined member are prevented from shifting and the shavings are hardly generated during press-fitting.

  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 drawings, (A) is a magnet roller used in a copier or printer. The magnet roller (A) is formed by a rod-shaped pipe member (1) and a total of two press-fitting members (2) (2) that are press-fitted to both ends in the length direction.

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

  On the other hand, the press-fitting 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. While being press-fitted into the pipe material (1), the other end is connected as a bearing to another member such as a copying machine. And this press-fit fitting member (2) has a hardness equal to or higher than that of the pipe material (1), and the surface roughness is Ra 0.2 to 0.8.

  The flange portion (3) of the press fitting member (2) is about 0.005 mm to 0.060 mm larger than the inner diameter of the pipe member (1) in order to securely press fit to the pipe member (1). It is formed in a cylindrical shape with an outer diameter. Further, 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 peripheral edge of the flange portion (3). Of the chamfered portions (4) and (5), as shown in FIG. 4, the proximal side chamfered portion (4) has a ratio w / h of the chamfer height h to the chamfer width w of 0.3 or less and a chamfer. While the width w is formed to be 0.15 mm or more, the distal side chamfered portion (5) has a chamfered angle larger than the chamfered angle of the proximal end chamfered portion (4), for example, about 45 degrees. Yes. In addition, in this invention, a chamfering angle means the angle which a chamfering part (4) (5) makes with respect to the axial direction of a press-fit fitting member (2), and chamfering height h is a base end side chamfering part ( 4) refers to the length in the axial direction of the press-fitting fitting member (2) in 4), and the chamfering width w is the length in the direction perpendicular to the axial direction of the press-fitting fitting member (2) in the base end side chamfered portion (4). Say it.

  Thus, in the base end chamfered portion (4), the ratio w / h between the chamfering height h and the chamfering width w is 0.3 or less and the chamfering width w is 0.15 mm or more. Since the sharpness of the bent portion (6) on the base end side of the end side chamfered portion (4) is moderately moderated, the press-fitting fitting member (2) can be easily and reliably attached to the pipe material (1) with a small press-fitting pressure. Can be press-fitted. Further, since the chamfering angle is formed at an angle larger than the chamfering angle of the proximal side chamfered portion (4) in the distal side chamfered portion (5), the function of insertion guide of the chamfered portion is sufficiently exhibited, It becomes easy to insert the front-end | tip part of a press-fit fitting member (2) into a pipe material (1).

  As shown in FIG. 3, the inside of the press-fitting member (2) is formed into a cylindrical hollow portion (7) from the other end portion to the flange portion (3) so as to substantially correspond to the outer shape. In addition, the flange portion (3) is formed into a truncated cone-shaped hollow portion (8) that gradually increases in diameter from the cylindrical hollow portion (7) toward the opening end portion, and the truncated cone-shaped hollow portion (8 ) To the opening end, it is formed into a cylindrical hollow portion (9). Further, a stepped portion (10) is formed on the base end face (3a) of the flange portion (3) of the press-fitting fitting member (2) for convenience when the flange portion (3) is formed.

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

  First, the axial lines of the pipe material (1) and the press-fitting fitting member (2) are made to substantially coincide with each other, and the tip side chamfered portion (5) of the press-fitting fitting member (2) is aligned with the inner surface of the end of the pipe material (1). While inserting the tip of the press-fitting member (2) into the pipe material (1), and press-fitting with the base side chamfer (4) along the inner surface of the end of the pipe material (1). Advance the insertion of member (2). At this time, the tip chamfered portion (5) of the press-fitting fitting member (2) is formed with an angle (about 45 degrees) larger than the chamfering angle of the proximal side chamfered portion (4). The function of the insertion guide of the side chamfered portion (5) is sufficiently exhibited, and it becomes easy to insert the tip end portion of the press-fitting fitting member (2) into the pipe material (1).

  Thereafter, when the press-fitting member (2) is pressed in the axial direction as it is against the pipe member (1), the flange portion (3) of the press-fitting member (2) gradually becomes inside the pipe member (1). The entire flange portion (3) is completely press-fitted into the pipe material (1), and the base end face (3a) of the flange portion (3) of the press-fitting fitting member (2) and the pipe material ( When the end face (1a) of 1) coincides, the press-fitting work of the press-fitting fitting member (2) is finished. At this time, in the base end chamfered portion (4), the ratio w / h between the chamfer height h and the chamfer width w is 0.3 or less and the chamfer width w is 0.15 mm or more. Since the sharpness of the bent portion (6) of the side chamfered portion (4) is moderately moderated, the press-fitting fitting member (2) can be easily and reliably press-fitted into the pipe material (1) with a small pressure. .

  If the other press-fitting member (2) is press-fitted in the other end opening of the pipe material (1) in the same manner as described above, the pipe material (1) is deformed such as buckling, A high-quality magnet roller (A) that prevents the axial lines of the pipe material (1) and the press-fitting fitting member (2) after press-fitting from being displaced and that hardly generates shavings during press-fitting is provided. can get. If necessary, the joint between the pipe member (1) and the press-fitting fitting member (2) is welded by friction welding or the like, or bonded with an adhesive, thereby further coupling the two members (1) and (2). It may be strong.

  In the above embodiment, the chamfered portion of the press-fitting fitting member (2) is configured in two stages, but is not limited thereto, and may be configured in multiple stages.

  Moreover, although the base end side chamfering portion (4) on the base end side is formed in a longitudinal section linear shape, it may be formed in a longitudinal section curved shape as shown in FIG.

  Moreover, although the one end part by which the press-fitting fitting member (2) is press-fitted is formed in a bulging shape, and the chamfered part (4) (5) is formed at the tip periphery of the flange part (3), the press-fitting is performed. It is good also as what forms a chamfer part (4) (5) directly in the front-end | tip periphery of a press-fit fitting member (2), without forming the one end part of a joint member (2) in a bulging shape.

  Moreover, although aluminum was used as the material of the pipe material (1) and the press-fitting fitting member (2), for example, an iron-based material other than aluminum may be used, or the pipe material (1) and the press-fitting fitting member. (2) may be formed of different materials.

It is sectional drawing which isolate | separates and shows the magnet roller which concerns on one Embodiment of this invention to a pipe material and a press-fit fitting member. It is a side view of the press fit fitting member of FIG. It is a longitudinal cross-sectional view of the press fit fitting member of FIG. It is an enlarged view of the I section of FIG. It is sectional drawing which shows a magnet roller by press-fitting and fitting a press-fitting fitting member to a pipe material. It is a principal part enlarged view of the press fit fitting member which concerns on other embodiment of this invention. It is sectional drawing which shows the conventional magnet roller.

Explanation of symbols

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

Claims (6)

A press-fitting fitting member in which a plurality of chamfered portions having different chamfering angles between adjacent ones are formed in multiple stages in the axial direction on the periphery of the end portion that is press-fitted and fitted inside the pipe material,
In the chamfered portion on the most proximal side among the chamfered portions, the ratio w / h of the chamfered height h to the chamfered width w is 0.3 or less, and the chamfered width w is 0.15 mm or more, The press-fitting fitting member, wherein the chamfering angle on the most distal end side is formed at an angle larger than the chamfering angle of the chamfering part on the proximal end side. The press-fitting fitting member according to claim 1, wherein the chamfered portion has two stages. 3. A pipe product, wherein the press-fitting member according to claim 1 or 2 is press-fitted and fitted into the pipe material at an end portion where the chamfered portion is formed. The pipe product according to claim 3, wherein a thickness and an outer diameter of the pipe material have a relationship of thickness / diameter ≦ 0.1. The pipe product according to claim 3 or 4, wherein the press-fitting fitting member has a hardness equal to or higher than that of the pipe material. The pipe product according to claim 5, wherein the press-fitting member has a surface roughness of Ra 0.2 to 0.8.

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