EP0052975A1 - Hupengehäuse und Hupe mit solch einem Gehäuse - Google Patents
Hupengehäuse und Hupe mit solch einem Gehäuse Download PDFInfo
- Publication number
- EP0052975A1 EP0052975A1 EP81305315A EP81305315A EP0052975A1 EP 0052975 A1 EP0052975 A1 EP 0052975A1 EP 81305315 A EP81305315 A EP 81305315A EP 81305315 A EP81305315 A EP 81305315A EP 0052975 A1 EP0052975 A1 EP 0052975A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- horn
- diaphragm
- horn body
- flange
- clamping ring
- 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- Withdrawn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
Images
Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
- G10K9/18—Details, e.g. bulbs, pumps, pistons, switches or casings
Definitions
- This invention relates to a horn and is particularly, though not exclusively, concerned with a diaphragm horn, e.g. an electro-magnetically operated diaphragm horn for use in a motor vehicle.
- the invention may also be applied to a horn having another type of sound-making mechanism, for example a reed and compressor type horn.
- the applicants have surprisingly found that the tonal qualities of a horn can be materially improved by using a horn body which has been treated in a particular way.
- a horn body formed of a non-alloy steel having nitrogen dispersed through substantially the whole of the section thereof, the nitrogen being in solid solution in a ferritic matrix.
- a horn body formed of a non-alloy steel having an epsilon iron nitride layer thereon.
- a horn comprising a hollow body and a sound-making mechanism in the hollow body, wherein the hollow body is as defined in any one of the last preceding three paragraphs.
- the horn illustrated therein is an electro-magnetically operated diaphragm horn for use in a motor vehicle.
- the precise construction of the electro- magnetic horn will not be described in any great detail herein except to state that it basically comprises a dished metal body 10 having a sound-making mechanism therein, the sound-making mechanism including a coil. 11, an armature 12 secured to a diaphragm 13, and a make-and-break mechanism 14.
- energisation of the coil 11 is effected through the make-and-break mechanism 14 so as to cause the armature 12 and diaphragm 13 to vibrate. Vibration of the diaphragm 13 cause the horn to sound.
- the body 10 is formed of mild steel (which is a non-alloy steel) having a carbon content of 0.1 to 0.2%.
- the body 10 is press formed form a sheet of mild steel having a thickness of 1.6mm.
- the mild steel of the body has been treated in a manner to be described hereinafter.
- the body 10 is provided with a core 15 having nitrogen diffused into the whole of the volume thereof, and a surface layer.16 on each side of the core 15.
- the dished body is provided externally and internally with the surface layer 16.
- the nitrogen in the core 15 is in solid solution in a ferritic matrix.
- Each surface layer 16 is of epsilon iron nitride and is constituted by two portions 16a and 16b. Portion 16a is porous, about 10 micrometres thick, and lies on the opposite side of the core 15 to the respective portion 16b.
- the portion 16b is relatively non porous and has thickness of about 8 micrometres.
- the total thickness of each epsilon nitride surface layer 16 is about 18 micrometres.
- the body 10 is provided with the structure as described above with reference to Fig. 2 by pressforming it from the non-alloy mild steel described above and then heat treating the body in a furnace at 570°C for two hours in an atmosphere consisting of ammonia and an endothermic gas mixture (carbon monoxide, carbon dioxide, nitrogen and hydrogen). During heat treatment, the residual level of ammonia was maintained at about 42% and 5 volume changes per hour were effected.
- the body after heat treatment was immediately oil quenched to ensure that the nitrogen which had diffused into the body remained in solid solution in : the ferritic matrix within the core 15. As a result of the oil quenching, oil was retained within the pores in the ; portion 16a of each epsilon nitride surface layer 16 to give good bearing properties to the surface.
- the body 10 had very good anti-corrosion properties and so did not need to be surface treated to prevent it from rusting. Furthermore, because of the tribological properties of the epsilon nitride layer on the body 10, it was possible to dispense with the usual paper gasket which is normally provided between the diaphragm 13 and the body. Thus, it will be seen from Fig. 1 that the diaphragm 13 is in direct ie surface-to-surface contact with an integral flange 17 of the body 10 and that these two components are secured together by means of a spun-over clamping ring 18.
- the clamping ring 18 was formed of aluminium (a material softer than that of the diaphragm) although it could have been formed of steel which had been coated with a suitably soft material such as plastics. With such a construction, it was also found possible to dispense with the usual paper gasket between the diaphragm 13 and the spun over clamping ring so that there is surface-to-surface contact between the diaphragm and the ring.
- the non-alloy steel body 10 having a low carbon content was heat treated in an atmosphere of ammonia and an endothermic gas mixture, it is to be appreciated that any form of treatment which is capable of diffusing nitrogen substantially through the whole of the section of the body, and/or which is capable of producing an epsilon nitride surface layer, can be employed in the treatment of the body 10.
- the tonal qualities of the horn to be improved Whilst the mechanism which enables the tonal qualities of the horn to be improved is not fully understood, it is believed that the tonal qualities are improved mainly because of the presence of nitrogen in solid solution throughout substantially the whole of the terrific matrix. Being dissolved interstitially, the nitrogen will considerably distort the alpha-iron lattice which will then collect and help to immobilise dislocation atmosphere, which then require an increased stress or strain energy to set them in motion again.
- the resultant heat treated body has a higher yield point than the unheat treated body and this, it appears, affects the resonating characterisitics of the body 10 under the influence of the vibrating diaphragm.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8037506 | 1980-11-22 | ||
GB8037506 | 1980-11-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0052975A1 true EP0052975A1 (de) | 1982-06-02 |
Family
ID=10517492
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP81305315A Withdrawn EP0052975A1 (de) | 1980-11-22 | 1981-11-10 | Hupengehäuse und Hupe mit solch einem Gehäuse |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0052975A1 (de) |
JP (1) | JPS57116397A (de) |
AU (1) | AU7754681A (de) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2787786A (en) * | 1952-07-05 | 1957-04-02 | Bosch Gmbh Robert | Sound producers |
FR2242921A5 (en) * | 1973-08-27 | 1975-03-28 | Bosch Gmbh Robert | Horn with membrane in front of vibration generator - edge of casing is folded over edge of membrane |
JPS53102842A (en) * | 1977-02-21 | 1978-09-07 | Asahi Chiyoda Kougiyou Kk | Method of reinforcing anticorrosion of iron metal parts |
-
1981
- 1981-11-10 EP EP81305315A patent/EP0052975A1/de not_active Withdrawn
- 1981-11-17 AU AU77546/81A patent/AU7754681A/en not_active Abandoned
- 1981-11-24 JP JP18824881A patent/JPS57116397A/ja active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2787786A (en) * | 1952-07-05 | 1957-04-02 | Bosch Gmbh Robert | Sound producers |
FR2242921A5 (en) * | 1973-08-27 | 1975-03-28 | Bosch Gmbh Robert | Horn with membrane in front of vibration generator - edge of casing is folded over edge of membrane |
JPS53102842A (en) * | 1977-02-21 | 1978-09-07 | Asahi Chiyoda Kougiyou Kk | Method of reinforcing anticorrosion of iron metal parts |
Non-Patent Citations (4)
Title |
---|
CHEMICAL ABSTRACTS, vol. 90, no. 4, January 1979, page 242, left-hand column, abstract 27235a Columbus, Ohio, (US) & JP - A - 53 102842 (ASAHI CHIYODA KOGYO K.K.) (07-09-1978) * |
CHEMICAL ABSTRACTS, vol. 93, no. 18, November 1980, page 223, left-hand column, abstract 171735t Columbus, Ohio (US) C. DAWES et al.: "A re-appraisal of nitrocarburizing and nitriding when applied to the design and manufacture of non-alloy steel automobile components" & J. HEAT TREAT 1979, 1(2) 30-42 * |
HARTEREI TECHN.MITTEILUNGEN, vol. 32, no. 4, April 1977, M}nchen (DE) J. MATAUSCHEK et al.: "Neue Erkenntnisse }ber den Aufbau und die Porigkeit der beim Badnitrieren erzeugten Verbindungsschicht" pages 177-181 * |
JOURNAL OF SPACECRAFT AND ROCKETS, vol. 12, no. 1, January 1975, New York(US) R.H. SHOEMAKER et al.: "Improvement in wear and fatigue properties of structural metals through liquid nitriding" pages 51-53 * |
Also Published As
Publication number | Publication date |
---|---|
AU7754681A (en) | 1982-06-03 |
JPS57116397A (en) | 1982-07-20 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Designated state(s): DE FR GB IT |
|
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: LUCAS INDUSTRIES PLC |
|
17P | Request for examination filed |
Effective date: 19821130 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 19841114 |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: DAWES CYRIL Inventor name: HIBELL, ERNEST GEORGE |