JP2011034644A - Collapsible e block, and swing arm unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a swing arm unit capable of enhancing a positioning accuracy and a rocking speed accompanying rocking displacement of a swing arm and also capable of being manufactured in high productivity and high material utilizing efficiency, and to provide a collapsible E block capable of configuring the swing arm unit. <P>SOLUTION: In the collapsible E block 130 including a plurality of arm plates 142 and 144 made of an aluminum alloy and a spacer 132 made of an AlSi-based alloy and having a mounting part 134 on a bearing unit 110 and a protruding part 136 protruding on an outer peripheral side from the mounting part 134 and having a joining surface to the plurality of arm plates 142 and 144, a structure where the plurality of arm plates 142 and 144 and the spacer 132 are integrated by diffusion joint is formed. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an assembly type E block and a swing arm unit.

  A swing arm unit used by being incorporated in a hard disk drive (HDD) is known. FIG. 9 is a view for explaining a conventional swing arm unit 900. 9A is a cross-sectional view of the swing arm unit 900, FIG. 9B is a cross-sectional view of a bearing unit 910 that constitutes a part of the swing arm unit 900, and FIG. 9C is a swing arm unit. 9 is a cross-sectional view of an E block 930 constituting a part of 900. FIG.

  As shown in FIG. 9A, the conventional swing arm unit 900 includes a bearing unit 910 and an E block 930 that is externally fitted and fixed to the bearing unit 910.

As shown in FIG. 9B, the bearing unit 910 includes a shaft 912, two bearings 914 </ b> A and 914 </ b> B that are spaced from each other in the axial direction of the shaft 912, and two bearings And a sleeve (outer cylinder) 918 that covers 914A and 914B. The sleeve 918 includes an inner peripheral surface that contacts the outer peripheral surfaces of the two bearings 914A and 914B, and a spacer portion 916 that protrudes toward the inner peripheral side toward the space between the two bearings 914A and 914B. The outer rings of the two bearings 914A and 914B are made of bearing steel (linear expansion coefficient: about 12.5 × 10 ⁻⁶ ). The sleeve 918 is made of stainless steel (for example, SUS303, linear expansion coefficient: about 17.2 × 10 ⁻⁶ ). In FIG. 9, reference numeral 950 denotes a coil. Further, in FIG. 9B, reference numeral 920 indicates a positioning stopper used for positioning the E block 930.

As shown in FIG. 9C, the E block 930 has an inner cylinder portion 932 and two arm portions 934, and is made of an aluminum alloy (linear expansion coefficient: about 23.7 × 10 ⁻⁶ ). . The E block 930 is manufactured by cutting an aluminum alloy block produced by extrusion molding to produce an aluminum alloy block, and then cutting out the aluminum alloy block.

Conventionally, a shaft, two bearings spaced from each other in the axial direction of the shaft, a spacer disposed between the two bearings, and a spacer portion are provided. There is also known a swing arm unit having a sleeve that does not (see, for example, Patent Document 1 or 2). In Patent Document 1, the sleeve is made of stainless steel (SUS304, linear expansion coefficient: about 16.3 × 10 ⁻⁶ ), and in Patent Document 2, an AlSi alloy (linear expansion coefficient: 11 × 10 ⁻⁶ to 15 ×). 10 ⁻⁶ ).

  According to the conventional swing arm unit 900, the swing arm unit described in Patent Document 1, or the swing arm unit described in Patent Document 2, the linear expansion coefficient between the material constituting the outer ring and the material constituting the sleeve Therefore, it is possible to suppress changes in the rigidity and torque of the bearing unit during use, and increase positioning accuracy and swing speed associated with swing displacement of the swing arm. .

  Further, according to the swing arm unit described in Patent Document 2, since the AlSi-based alloy which is easier to cut than stainless steel is used as the material constituting the sleeve, the sleeve having a high roundness of the inner diameter is configured. Therefore, the positioning accuracy associated with the swing displacement can be further increased. Further, since an AlSi-based alloy that is lighter than stainless steel is used as a material constituting the sleeve, the swing speed can be further increased.

JP 2001-304252 A International Publication No. WO2004 / 036074 Pamphlet

  However, in the conventional swing arm unit 900, the swing arm unit described in Patent Document 1, or the swing arm unit described in Patent Document 2, it is necessary to manufacture E blocks one by one by cutting out an aluminum alloy block. Therefore, there is a problem that productivity is low (it takes 10 minutes to cut out one E block). In addition, since a large amount of aluminum alloy is scraped off in the process of scraping the aluminum alloy block, there is a problem that the utilization efficiency of raw materials is low (2/3 of the aluminum alloy is scraped off).

  Therefore, the present invention has been made to solve these problems, and is a swing arm unit capable of increasing the positioning accuracy and the swing speed associated with the swing displacement of the swing arm, and has high productivity. And it aims at providing the swing arm unit which can be manufactured with high material utilization efficiency. Moreover, it aims at providing the assembly-type E block which can comprise such a swing arm unit.

  As a result of intensive efforts to achieve the above object, the present inventor, as in the case of the swing arm unit described in Patent Document 2, has a sleeve made of an AlSi alloy (the “spacer” of the present invention). If the sleeve and the arm portion of the E block are integrated by diffusion bonding, positioning according to the swinging displacement of the swing arm is performed as in the case of the swing arm described in Patent Document 2. In order to complete the present invention, it is possible to manufacture a swing arm with high productivity and high material utilization efficiency in addition to high accuracy and swing speed. It came.

[1] The assembly type E block of the present invention includes a plurality of arm plates made of an aluminum alloy, an AlSi-based alloy, a mounting portion to the bearing unit, and a plurality of arm plates protruding from the mounting portion to the outer peripheral side. And a plurality of arm plates and the spacers integrated by diffusion bonding.

  According to the assembly type E block of the present invention, since the spacer made of an AlSi-based alloy functions as a sleeve, if the swing arm unit is manufactured using the assembly type E block of the present invention, it is described in Patent Document 2. As in the case of the swing arm unit, the positioning accuracy and the swing speed associated with the swing displacement of the swing arm can be increased.

  Moreover, according to the assembly type E block of the present invention, since the AlSi-based alloy that is easier to cut than stainless steel is used as the material constituting the spacer, a sleeve with a high roundness of the inner diameter is formed. Therefore, it is possible to further increase the positioning accuracy associated with the oscillating displacement. In addition, since the AlSi-based alloy that is lighter than stainless steel is used as the material constituting the spacer, the swing speed can be further increased.

  Further, according to the assembly type E block of the present invention, it is possible to manufacture an assembly type E block by integrating a plurality of arm plates and spacers by diffusion bonding. Therefore, it is not necessary to cut out the aluminum alloy blocks to manufacture the E blocks one by one, and the problem of low productivity is eliminated. In addition, a large amount of aluminum alloy is not scraped off in the process of scraping an aluminum alloy block, and the problem of low raw material utilization efficiency is eliminated.

  As a result, the assembly type E block of the present invention is a swing arm unit capable of increasing the positioning accuracy and the swing speed associated with the swing displacement of the swing arm, and has high productivity and high material utilization efficiency. It becomes an assembly type E block which can constitute a swing arm unit which can be manufactured.

  In the assembly type E block of the present invention, the spacer refers to a spacer that has an inner peripheral shape that covers the bearing unit and functions as a sleeve.

[2] In the assembly type E block of the present invention, it is preferable that a linear expansion coefficient of the AlSi-based alloy is in a range of 17 × 10 ^{−6 to} 21 × 10 ⁻⁶ .

  When assembling a swing arm unit using a sleeve and a bearing unit, the bearing unit is lightly press-fitted into a sleeve whose inner diameter is slightly smaller (about 2 μm) than the outer diameter of the bearing unit. This is because the roundness of the bearing unit (outer ring) deteriorates when the bearing unit is heavily press-fitted into the sleeve (when the inner diameter of the sleeve is set to an inner diameter considerably larger than the outer diameter of the bearing unit (about 5 μm or more)). This is because the bearing performance deteriorates. On the other hand, when the bearing unit is lightly press-fitted into the sleeve, the sleeve linear expansion coefficient is larger than the linear expansion coefficient of the bearing when the operating temperature of the HDD device becomes high. The inner diameter is larger than the outer diameter of the bearing unit, and there is a possibility that a gap is generated between the sleeve and the bearing unit.

However, according to the experiment of the inventors of the present invention, when the linear expansion coefficient of the AlSi-based alloy is 21 × 10 ⁻⁶ or less, the material constituting the bearing unit (bearing steel (linear expansion coefficient: 12.5 and × ^{10 -6)),} it is possible to the material constituting the spacer (hereinafter sufficiently small value (about 8.5 × ^{10 -6} to difference in linear expansion coefficient between the AlSi alloy)), Even when an HDD device (for example, a 1.8-inch HDD device or a 2.5-inch HDD device) having a bearing unit with an outer diameter of 6 mm is operated at 80 ° C., which is the upper limit of the product operating temperature, the sleeve and the bearing unit It was found that there was no gap between them.

Further, according to the experiment by the inventors of the present invention, when the linear expansion coefficient of the AlSi alloy is 19 × 10 ⁻⁶ or less, the material constituting the bearing unit (bearing steel) and the material constituting the spacer Since the difference in linear expansion coefficient from (AlSi-based alloy) can be made even smaller (about 6.5 × 10 ⁻⁶ or less), an HDD device (for example, 2. It has been found that even when a 5-inch HDD device or a 3.5-inch HDD device) is operated at 80 ° C., which is the upper limit of the product operating temperature, no gap is generated between the sleeve and the bearing unit.

Furthermore, according to the experiment by the inventors of the present invention, when the linear expansion coefficient of the AlSi alloy is 17 × 10 ⁻⁶ or less, the material (bearing steel) constituting the bearing unit and the spacer are constituted. Since the difference in linear expansion coefficient from the material (AlSi-based alloy) can be further reduced (approximately 4.5 × 10 ⁻⁶ or less), an HDD device including a bearing unit having an outer diameter of 11 mm (for example, 3 It has been found that no gap is generated between the sleeve and the bearing unit even when the 5-inch HDD device is operated at 80 ° C., which is the upper limit of the product operating temperature.

Therefore, from the above viewpoint, the closer the linear expansion coefficient of the AlSi alloy to 12.5 × 10 ⁻⁶ , the more the assembly type E block of the present invention can be used for a larger HDD device. On the other hand, when the linear expansion coefficient of the AlSi alloy is less than 17 × 10 ⁻⁶ , the production of the AlSi alloy becomes difficult, and the spacer made of the AlSi alloy can be easily produced with high productivity. It becomes difficult to manufacture.

Therefore, considering these viewpoints comprehensively, in the assembly type E block of the present invention, the linear expansion coefficient of the AlSi-based alloy is preferably in the range of 17 × 10 ^{−6 to} 21 × 10 ⁻⁶ . is there.

  In the assembly type E block of the present invention, the diffusion bonding between the plurality of arm plates and the spacers may be performed by a pulse current bonding apparatus or by hot pressing while irradiating ultrasonic waves. It may be performed after the oxide film present on the joint surface between the plurality of arm plates and the spacers is removed by etching, or the plurality of arm plates and the spacers may be reduced in a reducing atmosphere. It may be performed in a state of being placed inside (for example, in hydrogen gas).

  By adopting the configuration as described above, it is possible to perform diffusion bonding of a plurality of arm plates and spacers in a state in which an oxide layer that may exist on the surface of the arm plate and the surface of the spacer is removed. Therefore, the plurality of arm plates and the spacer can be integrated with a high bonding force, and a high-strength assembling E block can be manufactured. In this case, since the aluminum alloy and the AlSi-based alloy are the same kind of metal, it is possible to integrate the plurality of arm plates and the spacer with a high bonding force from this viewpoint.

  Note that the diffusion bonding between the plurality of arm plates and the spacer may be performed with a metal (for example, copper or tin) forming a binary alloy interposed between the arm plate and the spacer. Good.

  In the assembly type E block of the present invention, the spacer is preferably manufactured by cutting an AlSi alloy round bar.

  An AlSi-based alloy is a material that can open a round hole having extremely high cylindricity because it has good machinability. For this reason, by setting it as the above structures, it becomes possible to manufacture the assembly-type E block which has a high shape precision with low manufacturing cost and high productivity.

  In the assembly type E block of the present invention, the spacer is preferably manufactured by forging a columnar preform made of an AlSi alloy.

  Since forging is a highly productive processing method, it is possible to manufacture an assembly type E block having high shape accuracy at a low production cost and high productivity even with the above-described configuration. It becomes.

  In the assembly type E block of the present invention, the arm plate is preferably manufactured by pressing an aluminum alloy plate.

  Since press working is a processing method with extremely high productivity, it is possible to manufacture an assembly type E block with low manufacturing cost and high productivity by adopting the above-described configuration.

[3] The swing arm unit of the present invention is a swing arm unit including a bearing unit that does not have a sleeve and an assembly type E block that is mounted on the bearing unit. It is an assembly type E block.

  Since the swing arm unit of the present invention is a swing arm unit including the assembly-type E block of the present invention, the swing arm unit can increase the positioning accuracy and the swing speed associated with the swing displacement of the swing arm. Thus, the swing arm unit can be manufactured with high productivity and high material utilization efficiency.

[4] In the swing arm unit of the present invention, the bearing unit includes a shaft, two bearings spaced from each other in the axial direction of the shaft, and the two bearings. Preferably, the mounting portion has an outer peripheral surface of the two bearings and an inner peripheral surface that contacts the outer peripheral surface of the spacer.

  Thus, when manufacturing a swing arm unit using the bearing unit which has a spacer, it is preferable to set it as the swing arm unit of the above structures.

[5] In the swing arm unit of the present invention, the bearing unit includes a shaft and two bearings that are spaced apart from each other in the axial direction of the shaft and are disposed with respect to the shaft. It is preferable to have an inner peripheral surface that comes into contact with the outer peripheral surfaces of the two bearings and a spacer portion that protrudes toward the inner peripheral side toward the space between the two bearings.

  Thus, when manufacturing a swing arm unit using the bearing unit which does not have a spacer, it is preferable to set it as the swing arm unit of the above structures.

It is a figure shown in order to demonstrate the assembly-type E block 130 and swing arm unit 100 which concern on Embodiment 1. FIG. FIG. 5 is a view for explaining a manufacturing process for manufacturing the assembly-type E block 130 and the swing arm unit 100 according to the first embodiment. It is a figure shown in order to demonstrate the diffusion bonding process in the manufacturing process for manufacturing the assembly-type E block 130 which concerns on Embodiment 1. FIG. It is a figure shown in order to demonstrate the assembly-type E block 230 and swing arm unit 200 which concern on Embodiment 2. FIG. FIG. 10 is a view for explaining a manufacturing process for manufacturing the assembly-type E block 230 and the swing arm unit 200 according to the second embodiment. It is a figure shown in order to demonstrate the manufacturing process for manufacturing the assembly-type E block 330 and swing arm unit 300 which concern on Embodiment 3. FIG. FIG. 6 is a view for explaining a manufacturing process for manufacturing an assembly-type E block 430 and a swing arm unit 400 according to a fourth embodiment. It is a figure shown in order to demonstrate the buffer ring 160 used for the swing arm unit which concerns on the modification of Embodiment 1. FIG. It is a figure shown in order to demonstrate the conventional swing arm unit 900. FIG.

  Hereinafter, an assembly type E block and a swing arm unit of the present invention will be described based on embodiments shown in the drawings. In the following drawings, members having the same function are denoted by the same reference numerals, and redundant description is omitted as appropriate.

[Embodiment 1]
FIG. 1 is a view for explaining the assembly-type E block 130 and the swing arm unit 100 according to the first embodiment. 1A is a cross-sectional view of the swing arm unit 100, FIG. 1B is a cross-sectional view of a bearing unit 110 used in the swing arm unit 100, and FIG. 1C is an assembly used in the swing arm unit 100. 4 is a cross-sectional view of an E block 130;

  As shown in FIG. 1A, the swing arm unit 100 according to the first embodiment includes a bearing unit 110 that does not have a sleeve, and an assembly type E block 130 that is attached to the bearing unit 110 (an assembly according to the first embodiment). Formula E block 130).

As shown in FIG. 1B, the bearing unit 110 includes a shaft 112, two bearings 114 </ b> A and 114 </ b> B that are spaced apart from each other in the axial direction of the shaft 112, and the two And a spacer 116 disposed between the bearings 114A and 114B. The outer rings of the bearings 114A and 114B are made of bearing steel (linear expansion coefficient: about 12.5 × 10 ⁻⁶ ), and the spacer 116 is stainless steel (SUS303, linear expansion coefficient: about 17.2 × 10 ⁻⁶ ). Consists of.

  As shown in FIG. 1C, the assembly-type E block 130 according to the first embodiment is composed of a plurality of arm plates 142 and 144 made of an aluminum alloy, an AlSi-based alloy, and a mounting portion 134 to the bearing unit 110. And a spacer 132 having a protruding portion 136 protruding from the mounting portion 134 to the outer peripheral side and having a joint surface 138 with the plurality of arm plates 142 and 144, and the plurality of arm plates 142 and 144 and the spacer 132 are formed by diffusion bonding. Has an integrated structure. The mounting portion 134 has an inner peripheral surface that abuts on the outer peripheral surfaces of the two bearings 114 </ b> A and 114 </ b> B and the outer peripheral surface of the spacer 116. A coil 150 is attached to the assembly type E block 130.

Al ₈₀ Si ₂₀ (linear expansion coefficient: 18.5 × 10 ⁻⁶ ) was used as the AlSi alloy. A5052 (linear expansion coefficient: 23.8 × 10 ⁻⁶ ) was used as the aluminum alloy.

  In the assembly-type E block 130 according to the first embodiment, the plurality of arm plates 142 and 144 and the spacer 132 have a structure integrated by diffusion bonding.

  In the assembly type E block 130 according to the first embodiment, the spacer 132 is manufactured by cutting a round bar made of an AlSi alloy.

  In the assembly type E block 130 according to the first embodiment, the arm plates 142 and 144 are manufactured by pressing an aluminum alloy plate.

FIG. 2 is a view for explaining a manufacturing process for manufacturing the assembly-type E block 130 and the swing arm unit 100 according to the first embodiment. 2A and 2B are process diagrams.
FIG. 3 is a view for explaining the diffusion bonding process in the manufacturing process for manufacturing the assembly-type E block 130 according to the first embodiment.

  As shown in FIG. 2, the swing arm unit 100 according to the first embodiment is manufactured by performing the “assembled E block manufacturing process” and the “attaching process of the bearing unit to the assembled E block” in this order. be able to. Hereinafter, it demonstrates in order of a process.

1. Assembly-type E block manufacturing process First, two arm plates 142 and 144 made of an aluminum alloy, a spacer 132 made of an AlSi alloy, and a coil 150 are prepared. Next, as shown in FIG. 2A, the two arm plates 142 and 144 and the spacer 132 are integrated by diffusion bonding, and further, by attaching the coil 150 to the coil attachment portion of the arm 142, The assembly type E block 130 (the assembly type E block 130 according to the first embodiment) is manufactured.

  As shown in FIG. 3, the diffusion bonding between the two arm plates 142 and 144 and the spacer 132 is performed by applying a pulse current when the two arm plates 142 and 144 are disposed on the bonding surface of the spacer 132. Pressure is applied between the two electrodes 12 and 14 in the bonding apparatus 10. In this state, a pulse current is passed between the two electrodes 12 and 14 by the power source 20. A carbon sheet 18 is disposed between the electrodes 12 and 14 and the arm plates 142 and 144. As a result, the portion where the two arm plates 142 and 144 and the spacer 132 are in contact with each other is heated, and the two metal plates are mixed together, so that the two arm plates 142 and 144 and the spacer 132 are connected. It can be integrated with a high bonding force.

2. First, a bearing unit 110 and an assembly type E block 130 are prepared. Next, after applying an adhesive to the inner peripheral surface of the assembly-type E block 130 and the outer peripheral surface of the bearing unit 110, as shown in FIG. 2B, the bearing unit 110 is arranged on the inner peripheral side of the assembly-type E block 130. Then, the adhesive is cured by putting it in the dryer for a predetermined time, and the bearing unit 110 and the assembly type E block 130 are integrated.

  Thereby, the swing arm unit 100 (the swing arm unit 100 according to the first embodiment) can be manufactured.

  The assembly type E block 130 according to the first embodiment and the swing arm unit 100 according to the first embodiment have been described above. The assembly type E block 130 according to the first embodiment and the swing arm unit 100 according to the first embodiment are described below. It has the following effects.

  That is, according to the assembly type E block 130 according to the first embodiment, the spacer 132 made of an AlSi-based alloy functions as a sleeve, so that the swing arm unit is manufactured using the assembly type E block 130 according to the first embodiment. By doing so, as in the case of the swing arm unit described in Patent Document 2, it is possible to increase the positioning accuracy and the swing speed associated with the swing displacement of the swing arm.

  Further, according to the assembly type E block 130 according to the first embodiment, since the AlSi-based alloy which is easier to cut than stainless steel is used as the material constituting the spacer 132, the sleeve having a high roundness of the inner diameter is used. Thus, the positioning accuracy associated with the rocking displacement can be further increased. In addition, since the AlSi-based alloy that is lighter than stainless steel is used as the material constituting the spacer 132, the swing speed can be further increased.

  Further, according to the assembly type E block 130 according to the first embodiment, the assembly type E block can be manufactured by diffusion bonding the plurality of arm plates 142 and 144 and the spacer 132 and integrating them. Therefore, it is not necessary to cut out the aluminum alloy blocks to manufacture the E blocks one by one, and the problem of low productivity is eliminated. In addition, a large amount of aluminum alloy is not scraped off in the process of scraping an aluminum alloy block, and the problem of low raw material utilization efficiency is eliminated.

  As a result, the assembly type E block 130 according to the first embodiment is a swing arm unit capable of increasing the positioning accuracy and the swing speed associated with the swing displacement of the swing arm, and has high productivity and high. This is an assembly type E block that can constitute a swing arm unit that can be manufactured with material utilization efficiency.

Further, according to the swing assembly type E block 130 according to the first embodiment, since the linear expansion coefficient of the AlSi-based alloy is 18.5 × 10 ⁻⁶ , the material constituting the bearing unit (outer rings of the bearings 114A and 114B: Bearing steel (linear expansion coefficient: about 12.5 × 10 ⁻⁶ ), spacer 116: stainless steel (SUS303, linear expansion coefficient: about 17.2 × 10 ⁻⁶ ), and material constituting the spacer (AlSi series) A large difference in linear expansion coefficient from the alloy (linear expansion coefficient: 18.5 × 10 ⁻⁶ ) does not occur, and a spacer made of AlSi alloy can be easily manufactured with high productivity. Become.

  Further, according to the assembly type E block 130 according to the first embodiment, since the diffusion bonding of the plurality of arm plates 142 and 144 and the spacer 132 is performed by the pulse current bonding apparatus, the surface of the arm plates 142 and 144 and Since the plurality of arm plates 142 and 144 and the spacer 132 can be joined in a state where the oxide layer that may exist on the surface of the spacer 132 is removed, the plurality of arm plates 142 and 144 and the spacer 132 can be joined. 132 can be integrated with a high bonding force, and a high-strength prefabricated E-block can be manufactured. In this case, since the aluminum alloy and the AlSi-based alloy are the same kind of metal, it is possible to integrate the plurality of arm plates and the spacer with a high bonding force from this viewpoint.

  Further, according to the assembly type E block 130 according to the first embodiment, the spacer 132 is a manufacturing method by cutting a round bar made of an AlSi-based alloy, so that the assembly type has high shape accuracy. It becomes possible to manufacture the E block at low manufacturing cost and high productivity.

  Further, according to the assembly type E block 130 according to the first embodiment, the arm plates 142 and 144 are manufactured by pressing an aluminum alloy plate, so that the manufacturing cost is low, and It becomes possible to manufacture the assembly type E block with high productivity.

  On the other hand, since the swing arm unit 100 according to the first embodiment is a swing arm unit including the assembly-type E block 130 according to the first embodiment, the positioning accuracy and the swing speed associated with the swing displacement of the swing arm are increased. This is a swing arm unit that can be manufactured with high productivity and high material utilization efficiency.

  Further, according to the swing arm unit 100 according to the first embodiment, as the E block, the assembly type E block 130 having the outer peripheral surface of the two bearings 114A and 114B and the inner peripheral surface contacting the outer peripheral surface of the spacer 116 is used. Therefore, this is suitable when a swing arm unit is manufactured using the bearing unit 110 having a spacer.

[Embodiment 2]
FIG. 4 is a view for explaining the assembly-type E block 230 and the swing arm unit 200 according to the second embodiment. 4A is a cross-sectional view of the swing arm unit 200, FIG. 4B is a cross-sectional view of the bearing unit 210 used in the swing arm unit 200, and FIG. 4C is an assembly used in the swing arm unit 200. FIG.
FIG. 5 is a diagram for explaining a manufacturing process for manufacturing the assembly-type E block 230 and the swing arm unit 200 according to the second embodiment. FIG. 5A and FIG. 5B are process diagrams.

The assembly-type E block 230 according to the second embodiment basically has the same configuration as the assembly-type E block 130 according to the first embodiment, but is an assembly-type E block for use with a bearing unit that does not have a spacer. This is different from the assembly type E block 130 according to the first embodiment.
That is, as shown in FIG. 4, the assembly-type E block 230 according to the second embodiment includes a shaft 212 and two bearings 214 </ b> A disposed with respect to the shaft 212 so as to be spaced apart from each other in the axial direction of the shaft 212. 214B is an assembly-type E block that is used with a bearing unit that does not have a spacer, and an inner peripheral surface that abuts on the outer peripheral surfaces of the two bearings 214A and 214B and a space between the two bearings 214A and 214B And a mounting portion 234 having a spacer portion 240 protruding toward the inner peripheral side.

  As described above, the assembly type E block 230 according to the second embodiment is different from the assembly type E block 130 according to the first embodiment in that it is an assembly type E block for use with a bearing unit having no spacer. Since a plurality of arm plates 242 and 244 made of an aluminum alloy and a spacer 232 made of an AlSi alloy are integrated by diffusion bonding, as in the case of the assembly type E block 130 according to the first embodiment, A swing arm unit that can increase the positioning accuracy and swing speed associated with the swing displacement of the swing arm, and that can be manufactured with high productivity and high material utilization efficiency. It becomes possible to do.

  As shown in FIG. 5, the swing arm unit 200 according to the second embodiment performs the “assembled E block manufacturing process” and the “attachment process of the bearing unit to the assembled E block” in this order. Can be manufactured. Hereinafter, it demonstrates in order of a process.

1. Assembly type E block manufacturing process First, two arm plates 242 and 244 made of an aluminum alloy, a spacer 232 made of an AlSi alloy, and a coil 250 are prepared. At this time, the spacer 232 includes an inner peripheral surface that contacts the outer peripheral surfaces of the two bearings 214A and 214B, and a spacer 240 that protrudes toward the inner peripheral side toward the space between the two bearings 214A and 214B. A spacer having a mounting portion 234 is prepared. Next, as shown in FIG. 5A, as in the case of the first embodiment, the two arm plates 242 and 244 and the spacer 232 are integrated by diffusion bonding, and the coil of the arm 242 is further integrated. The assembly type E block 230 (the assembly type E block 230 according to the first embodiment) is manufactured by attaching the coil 250 to the attachment portion.

2. First, a bearing unit and an assembly type E block 230 are prepared. At this time, as the bearing unit, a bearing unit in which the shaft 212 on which the bearing 214A is disposed and the bearing 214B is separated is prepared.
Next, after applying an adhesive to the inner peripheral surface of the assembly-type E block 230, the outer peripheral surface of the shaft 212 on which the bearing 214A is disposed, the outer peripheral surface of the bearing 214A, and the outer peripheral surface of the bearing 214B, FIG. As shown in FIG. 4, the shaft 212 and the bearing 214B, in which the bearing 214A is disposed on the inner peripheral side of the assembly-type E block 230, are lightly press-fitted, and then the adhesive is cured by putting it in a dryer for a predetermined time. The unit 210 and the assembly type E block 230 are integrated.

  Thereby, the swing arm unit 200 (swing arm unit 200 according to Embodiment 2) can be manufactured.

[Embodiment 3]
FIG. 6 is a view for explaining a manufacturing process for manufacturing the assembly-type E block 330 and the swing arm unit 300 according to the third embodiment. 6A and 6B are process diagrams.

  The swing arm unit 300 according to the third embodiment basically has the same configuration as that of the swing arm unit 100 according to the first embodiment, but a coil is not provided on one of the two arm plates. 6 and different from the swing arm 100 according to the first embodiment in that the coil 350 is provided on the coil arrangement plate 346 provided separately from the two arm plates 342 and 344, as shown in FIG. .

  As described above, the swing arm unit 300 according to the third embodiment relates to the first embodiment in that the coil 350 is provided on the coil arrangement plate 346 provided separately from the two arm plates 342 and 344. Although different from the swing arm unit 100, the swing arm according to the first embodiment has a structure in which a plurality of arm plates 342 and 344 made of aluminum alloy and a spacer 332 made of AlSi alloy are integrated by diffusion bonding. Similar to the case of the unit 100, the swing arm unit can increase the positioning accuracy and the swing speed associated with the swing displacement of the swing arm, and can be manufactured with high productivity and high material utilization efficiency. A swing arm unit can be manufactured.

[Embodiment 4]
FIG. 7 is a view for explaining a manufacturing process for manufacturing the assembly-type E block 430 and the swing arm unit 400 according to the fourth embodiment. 7A and 7B are process diagrams.

  The assembly type E block 430 according to the fourth embodiment basically has the same configuration as that of the assembly type E block 130 according to the first embodiment. However, as shown in FIG. 7, three arm plates 442 and 444 are provided. , 446 is different from the assembly type E block 130 according to the first embodiment. As shown in FIG. 7A, the arm plate 444 and the arm plate 446 are integrated by diffusion bonding the arm plate 444, the arm plate 446, and the bonding spacer 448.

  As described above, the assembly-type E block 430 according to the fourth embodiment is different from the assembly-type E block 130 according to the first embodiment in that three arm plates 442, 444, and 446 are used. Since the arm plates 442, 444 and 446 and the spacer 432 made of AlSi alloy are integrated by diffusion bonding, the swing arm of the swing arm is similar to the assembly type E block 130 according to the first embodiment. It is possible to manufacture a swing arm unit that can increase the positioning accuracy and the swing speed associated with the swing displacement, and can be manufactured with high productivity and high material utilization efficiency. .

  The assembly type E block and the swing arm unit of the present invention have been described based on the above embodiment, but the present invention is not limited to this, and can be implemented without departing from the scope of the present invention. For example, the following modifications are possible.

(1) In each of the first to fourth embodiments, diffusion bonding between the plurality of arm plates and the spacer is performed by a pulse current bonding apparatus, but the present invention is not limited to this. For example, it may be carried out by hot pressing while irradiating ultrasonic waves, or may be carried out after removing the oxide films present on the bonding surfaces of the plurality of arm plates and the spacers by etching, The arm plate and the spacer may be placed in a reducing atmosphere (for example, in hydrogen gas).

(2) In each of the first to fourth embodiments, Al ₈₀ Si ₂₀ (linear expansion coefficient: 18.5 × 10 ⁻⁶ ) was used as the AlSi alloy, but the present invention is not limited to this. Absent. For example, various AlSiX alloys and AlSi alloys such as an AlSiX alloy (linear expansion coefficient: 18.0 × 10 ⁻⁶ ) in which some iron is added to Al ₈₀ Si ₂₀ can be used as the AlSi-based alloy.
(3) In each of the first to fourth embodiments described above, the spacer manufactured by cutting an AlSi alloy round bar was used, but the present invention is not limited to this. . For example, a spacer manufactured by forging a cylindrical preform made of an AlSi alloy can also be used as the spacer.

(4) In the first or second embodiment, the arm plates 142 and 242 having the bent portions are used as the arm plate on which the coil is mounted out of the two arm plates, but the present invention is limited to this. Is not to be done. For example, an arm plate that does not have a bent portion can be used as the arm plate on which the coil is mounted out of the two arm plates.

(5) In the first embodiment, after the adhesive is applied, the bearing unit 110 and the assembly type E block 130 are integrated by lightly press-fitting the bearing unit 110 on the inner peripheral side of the assembly type E block 130. However, the present invention is not limited to this. FIG. 8 is a view for explaining the buffer ring 160 used when manufacturing the swing arm unit 100 according to the modification of the first embodiment. For example, the bearing unit 110 and the assembly type E block 130 can be integrated by lightly press-fitting a bearing ring 110 around the outer periphery of the bearing unit 110 into the inner periphery side of the assembly type E block 130. .

DESCRIPTION OF SYMBOLS 10 ... Pulse electricity joining apparatus, 12, 14 ... Electrode, 16, 18 ... Carbon sheet, 20 ... Power supply, 100, 200, 300, 400, 900 ... Swing arm unit, 110, 210, 310, 410, 910 ... Bearing unit 112, 212, 912 ... shaft, 114A, 114B, 214A, 214B, 914A, 914B ... bearing, 116 ... spacer, 130, 230, 330, 430 ... prefabricated E block, 132, 232, 332, 432 ... spacer , 134, 234 ... mounting portion, 136, 236 ... projection, 138, 238 ... joint surface, 142, 144, 242, 244, 342, 344, 442, 444 ... arm plate, 150, 250, 350, 450 ... coil , 160 ... Buffer ring, 346 ... Coil arrangement plate, 448 ... Joining spacer, 916 Spacer unit, 918 ... sleeve, 920 ... positioning stopper, 930 ... E block, 932 ... inner cylinder portion, 934 ... arm, P ... pressure

Claims (5)

A plurality of arm plates made of aluminum alloy;
A spacer comprising an AlSi-based alloy, a mounting portion to the bearing unit, and a protruding portion protruding from the mounting portion toward the outer peripheral side and having a joint surface with the plurality of arm plates,
The assembly type E block having a structure in which the plurality of arm plates and the spacer are integrated by diffusion bonding. The assembly type E block according to claim 1,
The assembly type E block characterized in that a linear expansion coefficient of the AlSi-based alloy is in a range of 17 × 10 ^{−6 to} 21 × 10 ⁻⁶ . A bearing unit without a sleeve;
A swing arm unit comprising an assembly type E block mounted on the bearing unit,
3. The swing arm unit according to claim 1, wherein the assembly type E block is the assembly type E block according to claim 1. In the swing arm unit according to claim 3,
The bearing unit includes a shaft, two bearings that are spaced from each other in the axial direction of the shaft, and a spacer that is disposed between the two bearings.
The swing arm unit, wherein the mounting portion has an inner peripheral surface that abuts on an outer peripheral surface of the two bearings and an outer peripheral surface of the spacer. In the swing arm unit according to claim 3,
The bearing unit includes a shaft, and two bearings disposed with respect to the shaft so as to be spaced apart from each other in the axial direction of the shaft.
The mounting portion includes an inner peripheral surface that abuts on an outer peripheral surface of the two bearings, and a spacer portion that protrudes toward the inner peripheral side toward a space between the two bearings. unit.

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