JP2008144783A - Bearing fixing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing fixing method for efficiently fixing a bearing to a predetermined portion in a short time without scattering a fine abrasion powder. <P>SOLUTION: In the bearing fixing method for fixing the bearing capable of rotatably supporting an object to be rotated to a predetermined portion, a joint area of the bearing 2 and a joint area of the predetermined portion (drive cover 4a and drive base 4b) are aligned in position to each other and the joint areas are abutted on each other, thereby fixing the bearing to the predetermined portion. In this case, when the joint areas are abutted on each other, a pin Pn is interposed over both joint areas. Alternatively, one joint area is press-fitted to the other joint area or both joint areas are adhered. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a bearing fixing method for fixing, for example, a bearing that rotatably supports a swing arm for a hard disk drive to a predetermined portion.

  Conventionally, various bearings are known that rotatably support a rotating object such as a swing arm for a hard disk drive (HDD) (see Patent Document 1). As an example, the bearing 2 shown in FIG. 2 has a shaft 6 that can be fixed to a predetermined portion (for example, the drive cover 4 a and the drive base 4 b) and a hollow cylindrical shape that is disposed so as to face the outside of the shaft 6. A rotating body 8 (for example, a housing) is provided, and a plurality of support structures are incorporated between the shaft 6 and the rotating body 8. Here, as an example of the support structure, the ball bearings 10 arranged in a double row along the shaft 6 are applied, but a roller bearing may be applied.

  Each ball bearing 10 includes an inner ring 12 and an outer ring 14 that are opposed to each other so as to be relatively rotatable, a plurality of rolling elements (balls) 16 that are rotatably incorporated between the inner and outer rings 12 and 14, and these rolling elements. (Balls) 16 and a retainer 18 that rotatably holds the balls 16 one by one. In such a configuration, a sealing plate (for example, a seal or a shield) may be provided to seal the inside of the bearing defined between the inner and outer rings 12 and 14 from the outside of the bearing, but is omitted here.

  In this case, each ball bearing 10 is positioned between the shaft 6 and the rotating body 8 by fitting (press-fitting) or bonding one by one from both sides, and in this state, the inner ring 12 is positioned on the outer periphery of the shaft 6. The outer ring 14 is fixed to the inner periphery of the rotating body 8. When each ball bearing 10 is positioned, a predetermined preload is applied to the ball bearing 10 by applying each outer ring 14 to an annular step 8a projecting from the inner periphery of the rotating body 8. Thus, the backlash of the rolling elements (balls) 16 during the rotation of the bearing can be eliminated. As a result, the rotating body 8 can be smoothly and stably rotated with respect to the shaft 6.

  As an apparatus in which such a bearing 2 is used, for example, an HDD apparatus as shown in FIGS. 3A and 3B is known. The HDD device includes a spindle motor 22 that rotates the magnetic disk 20 and a magnetic head 24 for recording or reading information. The magnetic head 24 is attached to the tip of a swing arm 26, and the swing arm 26 is rotatably supported on the base 28 of the HDD device by the bearing 2 described above. In this case, the magnetic head 24 is positioned in a state of being levitated to a height of 10 nm or less from the magnetic disk 20.

  Specifically, the swing arm 26 is fixed to the outer periphery of the rotating body 8 of the bearing 2 and is freely rotatable along with the rotating body 8 with the shaft 6 fixed to the drive cover 4a and the drive base 4b as the rotation center. ing. A voice coil 30 is provided on the proximal end side of the swing arm 26, and the rotation speed, the rotation direction, the rotation position, and the like of the swing arm 26 are driven and controlled by the voice coil 30. 3A and 3B has a function as the drive base 4b (FIG. 2). In FIG. 2, the drive cover 4a in FIG. 2 is omitted.

  According to this HDD apparatus, while the magnetic disk 20 is rotated by the spindle motor 22, the magnetic arm 24 is scanned along the magnetic disk 20 by rotating the swing arm 26 by the voice coil 30. It is possible to record information on the disk 20 or read information from the magnetic disk 20. The magnetic disk 20 is formed with a plurality of tracks (not shown) for recording information. By increasing the number of tracks per inch (TPI: tracks per inch) (for example, 200,000 TPI). Accordingly, the recording density of the magnetic disk 20 can be improved accordingly.

  When the bearing 2 is assembled to the HDD device, as a conventional bearing fixing method, for example, as shown in FIG. 2, the bearing 2 is fixed to the drive cover 4a and the drive base 4b (base 28) with screws 32a and 32b. The method to do is common. That is, the screw holes 6h formed on both sides of the shaft 6 are aligned with the fastening holes H1 and H2 formed in the drive cover 4a and the drive base 4b, respectively. Next, the shafts 6 are fastened to the drive cover 4a and the drive base 4b by inserting the screws 32a and 32b from the respective fastening holes H1 and H2 and screwing the screw portions N1 and N2 into the screw holes 6h. Thereby, the bearing 2 can be fixed to the drive cover 4a and the drive base 4 (base 28).

  However, in the conventional bearing fixing method, the reference for aligning the fastening holes H1 and H2 and the screw holes 6h is not particularly considered, so that the alignment is troublesome and takes time. For this reason, it was difficult to fix the bearing to a predetermined portion efficiently in a short time.

  In the conventional bearing fixing method, fine wear powder (for example, metal powder, resin powder, etc.) generated by interference (contact) between the screw portions N1, N2 and the fastening holes H1, H2 and the screw holes 6h is generated by the HDD. There is a case where it is scattered in the device (FIG. 3). At this time, when scattered wear powder adheres to the magnetic disk 20, for example, it becomes difficult to accurately record and reproduce information on the magnetic disk 20 depending on the degree of adhesion. Further, when scattered wear powder enters the bearing 2, it becomes difficult to keep the rotational accuracy of the bearing 2 constant depending on the amount of the intrusion, and as a result, the swing arm 26 is driven with constant accuracy. Control (for example, control of rotational speed, rotational direction, rotational position, etc.) cannot be performed.

In recent years, with the downsizing of HDD devices and the increase in recording capacity, further improvements in recording density (TPI) of magnetic disk 20, positioning accuracy of swing arm 26, and high-speed response are required. Therefore, in order to meet this demand, there is a demand for a technique for fixing the bearing 2 without scattering fine wear powder in the HDD device, but such a technique is not known at present.
JP 2004-286070 A

  The present invention has been made in order to meet such a demand, and an object thereof is to provide a bearing fixing method for efficiently fixing a bearing to a predetermined portion in a short time without scattering fine wear powder. It is in.

  In order to achieve such an object, the present invention provides a bearing fixing method for fixing a bearing capable of rotatably supporting an object to be rotated to a predetermined portion, wherein the joint region of the bearing and the joint region of the predetermined portion are positioned relative to each other. In addition, the bearing is fixed to a predetermined portion by applying the joining regions to each other. In this case, when the bonding regions are applied to each other, a pin is inserted over the bonding regions, or one bonding region is press-fitted into the other bonding region, or both bonding regions are bonded. Note that a swing arm of a hard disk drive device can be applied as the rotating object.

  According to the bearing fixing method of the present invention, the bearing can be efficiently fixed to a predetermined portion in a short time without scattering fine wear powder.

  Hereinafter, a bearing fixing method according to an embodiment of the present invention will be described with reference to the accompanying drawings. In the present embodiment, the case where the bearing 2 shown in FIG. 2 is applied as the bearing and the bearing 2 is fixed to a predetermined portion will be described. Further, as the predetermined portion, for example, a drive base 4b (FIG. 2) as the base 28 of the HDD device shown in FIGS. 3A and 3B, or a drive cover 4a (FIG. 2) for covering the HDD device. ) Is assumed.

  As shown in FIG. 1 (a), in the bearing fixing method of the present embodiment, the joint region of the bearing 2 and the joint region of the predetermined part (drive cover 4a, drive base 4b) are aligned with each other, thereby joining the joint region. The bearing 2 is fixed to a predetermined part by abutting each other. Here, for example, a rotating body (housing) 8 or a shaft 6 can be applied as a configuration for defining the joint region of the bearing 2, but a cylindrical shaft 6 is assumed as an example. In this case, the reference region is not particularly attached, but the joining region of the shaft 6 indicates the circular end surfaces 6t formed at both ends thereof, and the joining region of the predetermined portion (drive cover 4a, drive base 4b) is the shaft. 6 indicates an area to which the end face 6t is applied.

  In the present embodiment, through holes 4g into which pins Pn described later can be inserted are formed in the joint regions of the predetermined portions 4a and 4b, respectively, and the through holes 4g are formed in the joint region (end surface 6t) of the shaft 6. The receiving holes 6g for receiving the pins Pn inserted through the holes are respectively formed. In this case, the joining regions of the predetermined portions 4a and 4b and the joining region of the shaft 6 are aligned, the positions of the insertion holes 4g and the accommodation holes 6g are made to coincide with each other, and the joining regions are applied in this state.

  Specifically, the positions of the insertion hole 4g of the drive cover 4a and the accommodation hole 6g of the shaft 6 (end face 6t) are aligned with each other, and the insertion hole 4g of the drive base 4b and the accommodation hole 6g of the shaft 6 (end face 6t) are arranged. Match the positions to each other. Then, the end surfaces 6t at both ends of the shaft 6 are applied to the drive cover 4a and the drive base 4b. In this state, the pin Pn is inserted from the insertion hole 4g into the accommodation hole 6g, and the pin Pn is interposed between the joining region of the predetermined portions 4a and 4b and the joining region of the shaft 6. At this time, the end surfaces 6t at both ends of the shaft 6 are positioned and supported between the drive cover 4a and the drive base 4b via the pins Pn. Thereby, the bearing 2 can be fixed to a predetermined part.

  As described above, according to the present embodiment, the inside of the HDD device (FIG. 3) is sealed from the outside of the device by applying the end surfaces 6t at both ends of the shaft 6 to the drive cover 4a and the drive base 4b. . Therefore, after this, during the operation of inserting the pin Pn from the insertion hole 4g into the accommodation hole 6g, for example, fine wear powder generated due to interference (contact) between the pin Pn and the insertion hole 4g and the accommodation hole 6g is removed from the HDD device ( It is possible to reliably prevent scattering in FIG.

  As a result, it is possible to avoid wear powder from adhering to the magnetic disk 20 and the bearing 2, so that information can be recorded and reproduced on the magnetic disk 20 with high accuracy and the rotational accuracy of the bearing 2 is kept constant. can do. As a result, the recording density (TPI) of the magnetic disk 20, the positioning accuracy of the swing arm 26, and the high-speed response can be sufficiently improved.

  In the embodiment described above, the material of the pin Pn is not particularly mentioned, but a metal material such as iron or a resin material such as plastic can be applied. In this case, it is preferable to apply a resin material having excellent durability and heat resistance.

  In the above-described embodiment, the method of inserting the pin Pn from the insertion hole 4g into the accommodation hole 6g has not been specifically described. However, the pin Pn may be press-fitted from the insertion hole 4g into the accommodation hole 6g. After inserting the pin Pn from the insertion hole 4g into the accommodation hole 6g, the pin Pn, the insertion hole 4g, and the accommodation hole 6g may be fixed with an adhesive.

  In the above-described embodiment, the shape of the pin Pn, the insertion hole 4g, and the accommodation hole 6g is not particularly mentioned, but the end surface 6t of the shaft 6 can be positioned and supported between the drive cover 4a and the drive base 4b. Any shape can be arbitrarily set, and is not particularly limited here. As an example, when the pin Pn is set to a triangular prism, the insertion hole 4g and the accommodation hole 6g may be set to a hole (hole) shape through which the triangular pin Pn can be inserted. The sizes of the pin Pn, the insertion hole 4g, and the accommodation hole 6g are set according to, for example, the width and shape of the end surface 6t of the shaft 6 and the thickness and shape of the drive cover 4a and the drive base 4b. There is no particular limitation here.

  In the above-described embodiment, the timing for inserting the pin Pn from the insertion hole 4g into the accommodation hole 6g is not particularly mentioned, but the end surfaces 6t at both ends of the shaft 6 are defined at predetermined portions (drive cover 4a, drive base 4b). For example, the pin Pn may be simultaneously inserted from the insertion holes 4g of the two predetermined portions 4a and 4b so as to be accommodated in the respective accommodation holes 6g of the shaft 6. Alternatively, after the pin Pn is inserted through the insertion hole 4g of one part (for example, the drive cover 4a) and accommodated in one accommodation hole 6g of the shaft 6, the insertion hole of the other part (that is, the drive base 4b) The pin Pn may be inserted from 4g and accommodated in the other accommodation hole 6g of the shaft 6.

  In this case, for example, after the pin Pn is inserted and fixed in advance in the insertion hole 4g of the drive base 4b (for example, press-fitting, bonding, screwing), and one accommodation hole 6g of the shaft 6 is accommodated in the pin Pn The pin Pn may be inserted through the insertion hole 4g of the drive cover 4a and received in the other accommodation hole 6g of the shaft 6.

  As described above, when the pin Pn is fixed in advance in the insertion hole 4g of one of the predetermined portions 4a and 4b, the pin Pn may be integrally formed in the corresponding predetermined portion 4a and 4b. That is, when the drive cover 4a and the drive base 4b are manufactured, the pin Pn is also integrally formed at the same time, so that the trouble of inserting the pin Pn can be saved, so that the efficiency of the fixing process of the bearing 2 can be improved. it can.

  Further, in the above-described embodiment, instead of using the pin Pn, the joining region (end surface 6t) at both ends of the shaft 6 is joined to the joining region of the predetermined part (drive cover 4a, drive base 4b). The regions may be bonded to each other with an adhesive. An existing adhesive may be used as the adhesive, but an adhesive excellent in durability and heat resistance is preferable.

  According to the fixing method of the bearing 2 using such an adhesive, it is not necessary to form the insertion hole 4g and the accommodation hole 6g in both joining regions, and the pin Pn is also unnecessary. In this case, since the number of parts used for the bearing fixing method can be significantly reduced, the cost of the bearing fixing method can be reduced. Furthermore, since the bearing 2 can be fixed to a predetermined part only by bonding the bonding regions with an adhesive, the time required for the fixing process can be greatly reduced as compared with the conventional case.

  Note that the fixing method using the pin Pn described above and the fixing method using an adhesive may be combined depending on the purpose and environment of use of the bearing 2. For example, the bonding region of one part (for example, the drive cover 4a) and one bonding region of the shaft 6 are bonded and fixed with an adhesive. An insertion hole 4g and an accommodation hole 6g are formed in the other part (that is, the drive base 4b) and the other joining region of the shaft 6, and the pin Pn is inserted through the insertion hole 4g and accommodated in the accommodation hole 6g. It fixes (FIG. 1 (a)). Or, conversely, the joining region of one part and one joining region of the shaft 6 are fixed to each other with a pin Pn, and the joining region of the other part and the other joining region of the shaft 6 are bonded to each other by an adhesive. Glue and fix with.

  Further, the present invention is not limited to the above-described embodiment, and the same effect can be realized even when a bearing fixing method according to the following modification is applied. That is, in the bearing fixing method of this modification, when the joining regions are applied to each other, the one bearing region is press-fitted into the other joining region, so that the bearing 2 is press-fitted and fixed to a predetermined portion.

  FIG. 1B shows a configuration example for press-fitting and fixing. In the configuration example, the junction region of the predetermined portion (drive cover 4a, drive base 4b) is a junction region at both ends of the shaft 6. A press-fitting and fixing mechanism that can be fixed by press-fitting (end surface 6t) is constructed. Each press-fitting and fixing mechanism is provided with a contact surface 4t to which the end surface 6t of the shaft 6 can be applied, and a press-in surface 4s to which the outer peripheral surface 6s around the end surface 6t can be press-fitted.

  Here, since the end surface 6t of the shaft 6 has a circular shape and the outer peripheral surface 6s has a cylindrical shape, the contact surface 4t to which the end surface 6t can be applied is circular. The press-fitting surface 4s capable of press-fitting the outer peripheral surface 6s around the end surface 6t has a cylindrical shape. In this case, the inner diameter of the cylindrical press-fitting surface 4s is preferably set smaller than the outer diameter of the outer peripheral surface 6s of the shaft 6. Thereby, in a state where the joining region (end surface 6t) of the shaft 6 is press-fitted into the press-fit fixing mechanism, the end surfaces 6t at both ends of the shaft 6 are maintained in a state of being sandwiched between the contact surfaces 4t, and at the same time The outer peripheral surface 6s around 6t is maintained in a state of being gripped by the press-fitting surface 4s.

  As a result, the joining region (end surface 6t) at both ends of the shaft 6 can be firmly press-fitted into the joining region (press-fit fixing mechanism) of the predetermined part (drive cover 4a, drive base 4b). It becomes possible to fix to the parts 4a and 4b. When the joining region of the shaft 6 is press-fitted into the press-fitting and fixing mechanism, a sealed space (not shown) is formed in the region surrounded by the end surface 6t of the shaft 6, the contact surface 4t of the press-fitting and fixing mechanism, and the press-fitting surface 4s. Will be configured. In this case, the pressure (air pressure) inside the sealed space increases in accordance with the press-fitting amount of the shaft 6, and this acts as a reaction force against the press-fitting of the shaft 6. As a result, it may be difficult to smoothly press-fit the shaft 6.

  Therefore, in order to solve such a problem, an avoiding means for avoiding an increase in pressure inside the sealed space is provided in a joining region (press-fit fixing mechanism) of a predetermined portion (drive cover 4a, drive base 4b). In FIG. 1B, as an example of the avoiding means, a through hole 4h penetrating from the press-fitting surface 4s toward the outside of the sealed space is formed in a joining region of predetermined portions (drive cover 4a, drive base 4b). Yes. Note that the shape and size of the through-hole 4h are not particularly limited here because they can be arbitrarily set as long as the pressure inside the sealed space can be released to the outside.

  As described above, by providing the through-hole 4h in the press-fitting and fixing mechanism, the press-fitting operation of the shaft 6 can be performed smoothly. As a result, the bearing 2 is fixed to the predetermined parts 4a and 4b efficiently in a short time. be able to. Further, the through-hole 4h can be blocked by the end surface 6t by applying the end surfaces 6t at both ends of the shaft 6 to the contact surfaces 4t of the predetermined portions 4a and 4b. Foreign matter (for example, dust, dust, etc.) does not enter the surface.

  In the press-fit fixing mechanism described above, the press-fit surface 4s is extended in the direction of the ball bearing 10 along the outer peripheral surface 6s of the shaft 6, and the end surface 4c of the extended end is extended to the ball bearing 10 (inner and outer rings 12, 14). The ring 6 extends annularly between the shaft 6 and the rotating body (housing) 8 while maintaining a non-contact state along the axis. Then, the outer peripheral surface 4d continuous from the end surface 4c is extended along the rotating body (housing) 8 while maintaining a non-contact state. According to this, a protruding portion 4p protruding toward the ball bearing 10 (inner and outer rings 12, 14) is formed between the shaft 6 and the rotating body (housing) 8, and the protruding portion 4p and the ball bearing 10 (inner and outer rings) are formed. A gap G is formed between the wheels 12, 14) and the rotating body (housing) 8.

  In this case, by setting the size of the gap G to be small, this can be configured as a labyrinth seal of the bearing 2. As a result, for example, dust or dirt generated during operation of the HDD device (FIG. 3) can be prevented from entering the bearing 2, so that the rotational accuracy of the bearing 2 is maintained constant over a long period of time. can do. As a result, the recording density (TPI) of the magnetic disk 20, the positioning accuracy of the swing arm 26, and the high-speed response can be sufficiently improved.

  Depending on the purpose of use and usage environment of the bearing 2, a fixing method by press-fitting (FIG. 1 (b)), a fixing method using the above-described pin Pn (FIG. 1 (a)), and a fixing method using an adhesive. May be combined with each other. As an example, the joining region of one part (for example, the drive cover 4a) and one joining region of the shaft 6 are fixed by press-fitting, and the joining region of the other part (that is, the drive base 4b) and the other part of the shaft 6 are fixed. The junction region is fixed with a pin Pn. On the contrary, the joining region of one part and one joining region of the shaft 6 are fixed by the pin Pn, and the joining region of the other part and the other joining region of the shaft 6 are fixed by press-fitting. Alternatively, the joint region of one part and one joint region of the shaft 6 are fixed with a pin Pn, and the joint region of the other part and the other joint region of the shaft 6 are fixed with an adhesive, or one part The joining region of the shaft 6 and one joining region of the shaft 6 are fixed with an adhesive, and the joining region of the other part and the other joining region of the shaft 6 are fixed by press-fitting.

(a) is explanatory drawing of the bearing fixing method which concerns on one embodiment of this invention, Comprising: Sectional drawing which shows the state in which the bearing was fixed to the predetermined | prescribed site | part, (b) concerns on the modification of this invention Explanatory drawing of the bearing fixing method. Explanatory drawing of the conventional bearing fixing method. (a) is sectional drawing of a HDD apparatus, (b) is a top view of a HDD apparatus.

Explanation of symbols

2 Bearing 4a Drive cover 4b Drive base 6 Shaft Pn Pin

Claims (5)

A bearing fixing method for fixing a bearing capable of rotatably supporting a rotating object to a predetermined part,
A bearing fixing method comprising fixing a bearing to a predetermined part by aligning a joint area of a bearing and a joint area of a predetermined part with each other and applying the joint areas to each other.   The bearing fixing method according to claim 1, wherein when the joining regions are applied to each other, a pin is inserted over both joining regions.   The bearing fixing method according to claim 1, wherein when the joining regions are applied to each other, one joining region is press-fitted into the other joining region.   The bearing fixing method according to claim 1, wherein when the bonding regions are applied to each other, both the bonding regions are bonded.   The bearing fixing method according to claim 1, wherein the rotating object is a swing arm of a hard disk drive device.

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