GB2328263A - Disc drive damping arrangement - Google Patents
Disc drive damping arrangement Download PDFInfo
- Publication number
- GB2328263A GB2328263A GB9717232A GB9717232A GB2328263A GB 2328263 A GB2328263 A GB 2328263A GB 9717232 A GB9717232 A GB 9717232A GB 9717232 A GB9717232 A GB 9717232A GB 2328263 A GB2328263 A GB 2328263A
- Authority
- GB
- United Kingdom
- Prior art keywords
- disk drive
- damper
- arrangement
- damping
- frame
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
- F16F15/08—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with rubber springs ; with springs made of rubber and metal
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F7/00—Vibration-dampers; Shock-absorbers
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B33/00—Constructional parts, details or accessories not provided for in the other groups of this subclass
- G11B33/02—Cabinets; Cases; Stands; Disposition of apparatus therein or thereon
- G11B33/08—Insulation or absorption of undesired vibrations or sounds
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Aviation & Aerospace Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Supporting Of Heads In Record-Carrier Devices (AREA)
- Vibration Prevention Devices (AREA)
Abstract
The arrangement for damping the disc drive 14 comprises first 2 - 8 and second 9-12 dampers having different damping factors. The first dampers comprise inverted elastomeric cones by which the drive frame 18, providing extra mass, is attached to carriage 16. The second dampers comprise rubber blocks surrounded by metal cages.
Description
A DISK DRIVE DAMPING ARRANGEMENT AND A
METHOD FOR CUSHIONING A DISK DRIVE
Field of the Invention
This invention relates to a disk drive damping arrangement and a method of cushioning a disk drive. The invention is applicable to, but not limited to a double stage disk drive damping arrangement.
Background of the Invention
Disk drives are used for data storage in computers. There are several types of damping arrangement for disk drives.
A first type of known damping arrangement provides flexible metal shock mounts (for example, leaf spring) installed externally to a box which contains the disk drive. The metal shock mounts provide cushioning of the disk drive.
The disadvantage of the above damping arrangement is that the damping arrangement requires a large box. A further disadvantage is that the metal springs are very soft difficult to securely attach to the mass and may be deform permanently due to miss-handling of the box.
A second type of damping arrangement is a damping arrangement which provides metal shock mounts inside the box of the disk drive. The disadvantage of the second damping arrangement is that the metal shock mounts tend to produce a metal powder due to friction between metal parts which are usually installed inside the box.
The metal powder may cause short circuits and other damage.
This invention seeks to provide a damping arrangement and a method for cushioning disk drive which mitigates the above mentioned disadvantages.
Summarv of the Invention
According to the to a first aspect of the invention there is provided a disk drive damping arrangement. The disk drive damping arrangement includes at least a first damper and a second damper for damping motion of a disk drive assembly relative to a carriage. The second damper has a different damping factor than the first damper.
The disk drive damping arrangement is a double stage damping arrangement for disk drive. The first stage of the disk drive damping arrangement is providing damping factor for vibration and the second stage is providing damping factor for shocks. Furthermore, the disk drive assembly can vibrate freely in all horizontal directions and in vertical direction. The disk drive damping arrangement provides damping of vibration of 20 to 2000 Hz and damping shock pulses 20g during 11 seconds.
In the preferred embodiment of the invention the dampers include an elastomeric material.
Preferably, the first damper is cone shaped.
In this manner, the first damper permits a range of motion in an axial plane of the cone.
Preferably, the disk drive assembly has a mass matched to a resonant frequency of at least one of the first and second damper.
Preferably, the first damper exhibit a relatively low natural frequency when loaded by a weight of not more than 0.5 Kg.
Preferably, a resonant frequency of the first damper is symmetrical in all directions.
In the preferred embodiment of the invention, the first damper is made of Silicone-Rubber.
In the preferred embodiment of the invention, the second damper includes a snubber and an inverted "U" shape cage which is closed in three sides for limiting the snubber movement.
Preferably, the snubber is made of a high damping rubber.
In the preferred embodiment of the invention the disk drive damping arrangement further includes a frame for providing an extra mass to the disk drive, a side holder which provides a clamp force to the disk drive and a plate for holding the frame.
In this manner, the frame is made of Phosphor-Bronze.
Preferably, the side holder includes a leaf spring which provides clamping force to the disk drive.
In the preferred embodiment of the invention, the carriage includes at least one contact spring for reducing Electro Magnetic
Interference (EMI) and Radio Frequency Interference (RFI) and through holes which enable heat transfer.
Preferably, the centre of oscillation of the said disk drive damping arrangement is in a middle span-height of a free space available in all directions.
In a second aspect of the present invention a method for cushioning a disk drive is provided. The method includes the steps of providing a dummy load for increasing a mass of the disk drive, providing a first damper for damping a low frequency vibration and providing a second damper for damping a shock of high frequency.
Preferably, a step of matching the mass of the disk drive assembly to a resonant frequency of at least one of the first and the second damper is also provided.
Preferably, the dummy load is a frame for mounting the disk drive.
In this manner, the frame is made of Phosphor-Bronze.
In the preferred embodiment of the invention, the second damper is a spring.
In the preferred embodiment of the invention, a further step of providing a side holder having a leaf spring for clamping the disk drive to the metal frame, and for compensates for production tolerances of the said disk drive and the said frame is provided.
A preferred embodiment of the invention will now be described by way of example only, with reference to the drawing.
Brief Description of the Drawings
FIG. 1 is an isometric view of a disk drive installed on a damping arrangement assembly according to a preferred embodiment of the invention;
FIG. 2 is a cross-section of the first damper according to a preferred embodiment of the invention;
FIG. 3 is an isometric view of a frame of the damping arrangement according to a preferred embodiment of the invention; FIG. 4; is an isometric view of a metal leaf spring for providing a clamping force to a disk drive according to a preferred embodiment of the invention;
FIG. 5 is an explanatory diagram showing the first damper and the second damper in side by side relationship according to a preferred embodiment of the invention; and
FIG. 6 is a flow chart showing a method of cushioning a disk drive according to a preferred embodiment of the invention.
Detailed Description of the Drawings
Referring firstly to FIG. 1, a disk drive damping arrangement is shown. The disk drive damping arrangement 1 includes a set of first dampers 2,4,6 or 8 and a set of second dampers 9,10,11,12 for damping motion of a disk drive 14 relative to a carriage 16. The second dampers 9,10,11,12 have a different damping factor than the first dampers 2,4,6,8.
The disk drive damping arrangement 1 further includes a frame 18 for providing an extra mass to the disk drive 14, a side holder 20 which provides a clamp force to the disk drive and the carriage 16 for holding the disk drive 14 to the frame 18.
The carriage 16 includes at least one contact spring 19 for reducing Electro Magnetic Interference (EMI) and Radio Frequency
Interference (RFI) when the arrangement is housed in a metal enclosure and through holes 21 which enable heat transfer.
The damping arrangement 1 is a double stage damping arrangement. The first stage is vibration damping stage and the second stage is a shock absorbing or damping stage.
The dampers providing the damping stage will now be described in more detail.
FIG. 2 shows a first damper 6 in cross-section. The first damper 6 is generally cone shaped having conical side wall 6a, an axially extending sleeve 6b, a peripheral flange 6c and a tubular metal insert 6d.
Parts 6a, 6b and 6c are formed of elastromeric silicon rubber material in a molding process so that they form one integral component. The metal insert is inserted into the metal sleeve and bonded thereto.
The flange 6c is provided with two holes to accept screws 6e and 6f.
The screws 6e, 6f retain the flange 6c to the frame 18.
The metal insert at its top end 6g is provided with an internal thread to accept screw 6h which fixes this end of the damper to the carriage 16.
The figure shows the cone in a state of tension with the weight of the disk drive assembly pulling downwards. This permits a range of up and down motion as indicated by labelled arrow 6j.
The disk drive 14 is mounted on the frame 18 by screws 6h. The frame 18 is a metal frame made of Phosphor-Bronze which adds a mass of 0.16 Kg to the disk drive 14, reaching a total mass of 0.4 Kg for the disk drive 14 with the frame 18. The total mass of 0.4 Kg causes the dampers 2,4,6 and 8 to extend. The first dampers 2,4,6 and 8 exhibit a relatively low natural frequency when loaded by a weight of not more than 0.5 Kg.
The static settlement of the first damper of the preferred embodiment causes to a low natural resonant frequency of 14 to 16 Hz. A low natural frequency provides larger range of damping. In the preferred embodiment the effective damping range is from 20Hz to 2000Hz. The first damper permits a range of motion in an axial plane of the cone as indicated by arrow 6j and also in a horizontal plane as indicated by arrow 6k.
An alternative for the first damper is a metal spring made of "Societec - Aerospace" which exhibit a resonant frequency of 10 Hz and provide a better damping factor at low range.
The second damper 9,10,11 or 12 includes two parts, a snubber 22 and a metal cage 8. The metal cage 8 has an inverted "U" shape cage which is closed on three sides for limiting the snubber 22 vibration prior to impact. The snubber 22 is made of an high damping factor rubber and designed to decelerate the disk drive 14 movement during impact. The travel of snubber 22 is limited by the metal cage 8. In the preferred embodiment the travel available for deceleration and vibration of the disk drive 14 is 3 millimetre prior to beginning of impact when the snubber 22 makes contact with the cage. The snubber 22 is deflected no more then 30% of the deflection ratio which avoids "spring hardening" effect of rubber under compression.
The damping arrangement 1 is tuned to exhibit its centre of oscillation in a middle span-height of a free space available in all direction. The centre of gravity height of the damping arrangement 1 coincides with the carriage 16 which inhibits a coupled rocking mode of vibration in the horizontal direction.
The disk drive damping arrangement comprises two major subassemblies. A disk drive assembly 17 and a carriage 16.
Referring now to FIG. 3 the disk drive assembly 17 is shown. The disk drive assembly 17 includes the first damper 2,4,6,8, the snubber 22, 26 28 and 30, the frame 18, the disk drive 14 and the side holder 20.
Referring now to FIG. 4 the side holder 20 is shown. The side holder 20 is bolted to the frame 18 and includes a leaf spring 22 which provides clamping force to the disk drive 14. The disk drive 14 is clamped to the frame 18 using the leaf spring 22 that provides the clamping force without stressing the disk drive 14. Furthermore, the side holder 20 compensates for production tolerance of the disk drive 14 and the frame 18 because of the self adjusting nature of the spring. This self adjusting nature also caters for expansion and contraction of the disk drive 14 due to temperature variation.
Referring now to FIG. 5, an explanatory figure of the two types of damper in side by side relationship is shown. It will be seen that there exists a clearance x (in this case clearance x is 3 mm) between the snubber 22 and metal cage 24. Thus, in the first stage of damping the snubber 22 is freely moving in the cage 24 with the motion of the disk drive assembly 17 being damped by the first dampers 2,4,6,8. When the motion indicated by the arrows 6k and 6j exceeds the clearance x in any direction the snubber 22 makes contact with the metal cage 24. Thus, the second damper 10 comes into action to further damp the motion of the disk drive assembly 17.
Referring now to FIG. 6 a method of cushioning a disk drive is shown. The first step, step 100 is that of providing a dummy load for increasing a mass of the disk drive 14. The dummy load in the described embodiment is the frame 18 for mounting the disk drive 14. Preferably, the frame 18 is made of Phosphor-Bronze. The next step, step 102 is that of providing a first damper 2,4,6,8 for damping a low frequency vibration. The first damper 2,4,6,8 is cone shaped and made of Silicone
Rubber in the described embodiment. The static settlement of the first damper 2,4,6,8 of the preferred embodiment causes to a low natural frequency of 14 to 16 Hz. The next step, step 104 is that of providing a second damper 9,10,11,12 for damping shocks of a high frequency. The second damper 9,10,11,12 includes a snubber 22,26,28,30 and a metal cage 24 having an invert "U" shape. The metal cage limits the snubber travel during vibration to 3 millimetre, prior impact.
An alternative first damper is a spring which for example have a natural frequency of 10 Hz. The last step, step 106 is that of providing a side holder 20 having a leaf spring 22 for clamping the disk drive 14 to the frame 18. the side holder 20 compensates for production tolerances of the disk drive 14 and the frame 18 and a temperature variation.
Claims (23)
1. A disk drive damping arrangement comprising:
at least a first damper; and
a second damper for damping motion of a disk drive assembly relative to a carriage, wherein the second damper has a different damping factor than the first damper.
2. A disk drive damping arrangement as claimed in claim 1 wherein the first damper damps motion in a first range of movement and the second damper damps motion in a second range of movement different to the first.
3. An arrangement as claimed in claim 1 or 2 wherein the dampers comprise an elastomeric material.
4. An arrangement as claimed in claims 1,2 or 3, wherein the first damper is cone shaped.
5. An arrangement as claimed in claim 4 wherein the first damper permits a range of motion in an axial plane of the cone.
6. An arrangement as claimed in any preceding claim wherein the disk drive assembly has a mass matched to a resonant frequency of at least one of the first and second damper.
7. An arrangement as claimed in claims 1 to 6 wherein the first damper exhibit a relatively low natural frequency when loaded by a weight of not more than 0.5 K'g.
8. An arrangement as claimed in claims 1 to 7 wherein a resonant frequency of the first damper is symmetrical in all directions.
9. An arrangement as claimed in claims 1 to 8 wherein the first damper is made of Silicone-Rubber.
10. An arrangement as claimed in claims 1 to 9 wherein the second damper comprises:
a snubber; and
an inverted "U" shape cage which is closed in three sides for limiting the snubber movement.
11. An arrangement as claimed in claim 10 wherein the snubber is made of a high damping rubber.
12. An arrangement as claimed in claims 1 to 11 further comprises:
a frame for providing an extra mass to the disk drive;
a side holder which provides a clamp force to the disk drive; and
a plate for holding the frame.
13. An arrangement as claimed in claim 12 wherein the frame is made of Phosphor-Bronze.
14. An arrangement as claimed in claim 12 wherein the side holder comprises:
a leaf spring which provides clamping force to the disk drive.
15. An arrangement as claimed in claim 12 wherein the carriage further comprises:
at least one contact spring for reducing Electro Magnetic
Interference (EMI) and Radio Frequency Interference (RFI); and
through holes which enable heat transfer.
16. An arrangement as claimed in claims 1 to 15 wherein the centre of oscillation of the said disk drive damping arrangement is in a middle span-height of a free space available in all direction.
17. A method for cushioning a disk drive comprising the steps of:
providing a dummy load for increasing a mass of the disk drive;
providing a first damper for damping a low frequency vibration; and
providing a second damper for damping a shock of high frequency.
18. A method as claimed in claim in claim 17 comprising the step of:
matching the mass of the disk drive assembly to a resonant frequency of at least one of the first and the second damper.
19. A method as claimed in claim 17 wherein the dummy load is a frame for mounting the disk drive.
20. A method as claimed in claims 17,18 and 19 wherein the frame is made of Phosphor-Bronze.
21. A method as claimed in claims 16,17,18 or 19 wherein the second damper is a spring.
22. A method as claimed in claims 17 to 21 comprises a further step of:
providing a side holder having a leaf spring for clamping the disk drive to the metal frame, and for compensates for production tolerances of the said disk drive and the said frame.
23. A disk drive damping arrangement substantially as hereinbefore described with reference to and as illustrated by the drawing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9717232A GB2328263A (en) | 1997-08-15 | 1997-08-15 | Disc drive damping arrangement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9717232A GB2328263A (en) | 1997-08-15 | 1997-08-15 | Disc drive damping arrangement |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9717232D0 GB9717232D0 (en) | 1997-10-22 |
| GB2328263A true GB2328263A (en) | 1999-02-17 |
Family
ID=10817475
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9717232A Withdrawn GB2328263A (en) | 1997-08-15 | 1997-08-15 | Disc drive damping arrangement |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2328263A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL2007836A (en) * | 2011-03-24 | 2012-09-25 | Google Inc | Computer component vibration isolation. |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4325133A (en) * | 1979-03-12 | 1982-04-13 | Gustav Reitmayer | Disc player apparatus |
| US4568988A (en) * | 1984-02-22 | 1986-02-04 | Rodime Plc | Micro hard-disk drive system |
| US4685303A (en) * | 1985-07-15 | 1987-08-11 | Allen-Bradley Company, Inc. | Disc drive isolation system |
| US4831476A (en) * | 1985-07-15 | 1989-05-16 | Allen-Bradley Company | Disc drive isolation system |
| WO1993020556A1 (en) * | 1992-04-01 | 1993-10-14 | Peter Forsell | An arrangement pertaining to cd-players |
-
1997
- 1997-08-15 GB GB9717232A patent/GB2328263A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4325133A (en) * | 1979-03-12 | 1982-04-13 | Gustav Reitmayer | Disc player apparatus |
| US4568988A (en) * | 1984-02-22 | 1986-02-04 | Rodime Plc | Micro hard-disk drive system |
| US4568988B1 (en) * | 1984-02-22 | 1988-11-29 | ||
| US4685303A (en) * | 1985-07-15 | 1987-08-11 | Allen-Bradley Company, Inc. | Disc drive isolation system |
| US4831476A (en) * | 1985-07-15 | 1989-05-16 | Allen-Bradley Company | Disc drive isolation system |
| WO1993020556A1 (en) * | 1992-04-01 | 1993-10-14 | Peter Forsell | An arrangement pertaining to cd-players |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL2007836A (en) * | 2011-03-24 | 2012-09-25 | Google Inc | Computer component vibration isolation. |
| EP2503429A3 (en) * | 2011-03-24 | 2014-08-20 | Google, Inc. | Computer component vibration isolation |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9717232D0 (en) | 1997-10-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7312982B2 (en) | Digital storage element mechanical shock isolation arrangement in a host device and method | |
| US4703470A (en) | Dynamic absorber device for use with disk drives | |
| US5370352A (en) | Damped vibration isolation system | |
| US9086112B2 (en) | Instrumented platform for vibration-sensitive equipment | |
| US20030210519A1 (en) | Shock and vibration isolation system | |
| JPH11234794A (en) | Method and device for attenuating mechanical resonance of speaker | |
| WO2000055522A1 (en) | Air damper | |
| US6621694B2 (en) | Vibration tolerant electronic assembly and related methods | |
| GB2328263A (en) | Disc drive damping arrangement | |
| KR101328791B1 (en) | Vibration isolation device | |
| US2762678A (en) | Anti-vibration support | |
| JP2002286451A (en) | Vibration-proof buffer device for gyrocompass | |
| JPH03104079A (en) | Magnetic disk device | |
| JPH04228937A (en) | Vibration isolator | |
| JPH09139062A (en) | Recording and reproducing device | |
| JPS63275828A (en) | Damper device | |
| JP2584097B2 (en) | Recording / reproducing apparatus, coulomb damper, and vibration isolation method | |
| RU2264568C1 (en) | Vibration insulator | |
| JPS5919734A (en) | Vibration absorbing device | |
| CN117222158A (en) | Electrical box assembly and electrical equipment | |
| JPH07145838A (en) | Vibration-proof supporting device | |
| JP2001126462A (en) | Vibration proof mechanism and portable information recording and reproducing device | |
| KR100238257B1 (en) | Anti-vibration device for electronics | |
| JPH07174190A (en) | Vibration isolating supporting device | |
| JPH09133182A (en) | Shock absorber |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |