US3829635A - Electrical insulating element such as a distributor cap - Google Patents

Electrical insulating element such as a distributor cap Download PDF

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Publication number
US3829635A
US3829635A US00396516A US39651673A US3829635A US 3829635 A US3829635 A US 3829635A US 00396516 A US00396516 A US 00396516A US 39651673 A US39651673 A US 39651673A US 3829635 A US3829635 A US 3829635A
Authority
US
United States
Prior art keywords
distributor cap
peripheral wall
foam
foam material
distributor
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.)
Expired - Lifetime
Application number
US00396516A
Other languages
English (en)
Inventor
D Elwert
G Gaege
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Application granted granted Critical
Publication of US3829635A publication Critical patent/US3829635A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P7/00—Arrangements of distributors, circuit-makers or -breakers, e.g. of distributor and circuit-breaker combinations or pick-up devices
    • F02P7/02—Arrangements of distributors, circuit-makers or -breakers, e.g. of distributor and circuit-breaker combinations or pick-up devices of distributors

Definitions

  • An insulating element particularly one which is suitable to accommodate a high-voltage component of a combustion engine ignition system, has a peripheral wall which is composed of closed-cell rigid synthetic plastic foam material to the extent of at least 50 percent its weight. Combustion suppressing and/or reinforcing filler substances may be added to the foam material.
  • the invention relates to an insulating element such as a distributor cap which can be used to accommodate a high-voltage component of a combustion engine ignition system.
  • an object of the invention to provide an improved insulating element e.g., a distributor cap wherein the development of condensation under the aforementioned or similar circumstances is at least minimized.
  • this wall is composed of closed-cell rigid synthetic plastic foam material to the extent of at least 50 percent of its weight.
  • the air which is entrapped in the cells of the foam material provides for excellent thermal insulation, so
  • FIGURE is a partly sectioned perspective view, illustrating one embodiment of the invention.
  • the novel insulating element designated in toto with reference numeral 1
  • a distributor cap i.e., as the cap for the housing of a distributor which forms a part of the ignition system of a combustion engine.
  • the system nor the housing of the distributor have been illustrated; both are well known per se and not necessary for an understanding of the invention.
  • the element 1 has a peripheral wall 2 which, in this instance where the element is configurated as a distributor cap, is provided with a plurality of tubular projections 5.
  • the high-voltage lead wires from the ignition coil and to the sparkplugs, respectively, are to be introduced through these projections into the interior of the hollow cap.
  • the wall 2 (including the projections 5) is composed to the extent of at least 50 percent of its weight from a rigid synthetic plastic foam material. It is preferable, however, that this percentage be on the order of 65 percent. Since it is desirable to have good strength even if the wall 2 is relatively thin, we have chosen to illustrate that the wall 2 is of so-called rigid structural foam, also known as rigid integral foam. Such foam, which may be of polyurethane or polyisocyanurate, to name just two suitable materials, has the characteristic that its porosity is greatest at and near the center, so that the wall 2 has a cellular core indicated at 3.
  • the porosity decreases continuously in direction outwardly away from the core 3, until the surfaces of the wall 2 are reached where there is no porosity at all, so that at these surfaces the wall is provided with non-porous skins 4.
  • This type of foam provides high rigidity and strength at relatively low wall thickness, and prevents the entry of dirt
  • the wall 2 also has good resistance to attack by acids.
  • a flame-suppressing or combustion-suppressing substance in the material of the wall a flame-suppressing or combustion-suppressing substance.
  • Aluminum oxide hydrate Al O '30-35% H O
  • Such a substance may be admixed with the foam to the extent of between 10 and 50 percent by weight of the wall 2, preferably about 35 percent.
  • the rigidity of the wall 2 can be further increased by admixing with the foam a filler material, for example kaolin, talcum or mica.
  • the filler substance may amount to between 10 and 50 percent, preferably about 35 percent by weight of the wall 2 It will be appreciated that it is possible to add a flameor combustion-suppression substance as well as filler material. In that case, however, the two substances together must not amount to more than at most 50 percent by weight of the wall 2, and preferably should not exceed 35 percent.
  • the foam material of wall 2 not only serves as an eff cient thermal insulator, but also as a fully satisfactory electrical insulator. This eliminates the need for a separate layer of electrical insulating material and, in conjunction with the low expense of the foam material, substantially reduces the manufacturing costs of the novel element.
  • a distributor mechanism in combination, a distributor mechanism; a distributor cap having a circumferential wall at least partially surrounding said distributor mechanism, an end wall substantially closing an end of said circumferential wall, and a plurality of tubular wall portions projecting from said end wall for accommodating electric input and output leads, said distributor cap being composed of a first reinforcing skin facing exteriorly of said distributor cap, a second reinforcing skin facing interiorly of said distributor cap, said skins being impermeable to fluids, and a cellular core integral with and intermediate said first and second skins for electrically and thermally insulating the former from the latter, whereby condensation of water vapor on said second skin is effectively prevented.
  • a distributor cap comprising a peripheral wall including a circumferential wall portion, an end wall portion substantially closing one end of said circumferential wall portion, and a plurality of tubular wall portions projecting from said end wall portion, said peripheral wall being composed of closed-cell rigid synthetic plastic structural foam material to the extent of at least 50 percent of its weight and having-a cellular core and non-cellular impermeable outer exposed reinforcing skins.
  • said foam material includes a plurality of closed cells, the size of said cells gradually decreasing from a point substantially midway of said skins in direction towards the latter.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
US00396516A 1972-09-12 1973-09-12 Electrical insulating element such as a distributor cap Expired - Lifetime US3829635A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2244597A DE2244597C3 (de) 1972-09-12 1972-09-12 Elektrischer Isolierkörper für Zündanlagen von Brennkraftmaschinen

Publications (1)

Publication Number Publication Date
US3829635A true US3829635A (en) 1974-08-13

Family

ID=5856045

Family Applications (1)

Application Number Title Priority Date Filing Date
US00396516A Expired - Lifetime US3829635A (en) 1972-09-12 1973-09-12 Electrical insulating element such as a distributor cap

Country Status (9)

Country Link
US (1) US3829635A (enrdf_load_stackoverflow)
JP (1) JPS5047041A (enrdf_load_stackoverflow)
BR (1) BR7306982D0 (enrdf_load_stackoverflow)
DE (1) DE2244597C3 (enrdf_load_stackoverflow)
ES (1) ES418672A1 (enrdf_load_stackoverflow)
FR (1) FR2199169B1 (enrdf_load_stackoverflow)
GB (1) GB1439700A (enrdf_load_stackoverflow)
IT (1) IT1001540B (enrdf_load_stackoverflow)
SE (1) SE393663B (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4177365A (en) * 1976-12-28 1979-12-04 Blackman Stanley J Moisture reducer for use in heated and vented container including electrical contacts
US4529850A (en) * 1983-08-17 1985-07-16 Robert Bosch Gmbh Ignition distributor cap
US20120138334A1 (en) * 2009-08-21 2012-06-07 Patrick Clayton Electrical insulating cap formation
US20120145435A1 (en) * 2009-08-21 2012-06-14 Patrick Clayton Electrical insulating cap formation

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3619464A1 (de) * 1986-06-10 1987-12-23 Bosch Gmbh Robert Zuendspule fuer zuendanlagen von brennkraftmaschinen

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3277666A (en) * 1965-01-14 1966-10-11 Marsden H Simmons Ice storage system
DE1694560A1 (de) * 1967-01-24 1971-08-12 Licentia Gmbh Verfahren zur Herstellung von flammwidrigen,insbesondere unbrennbaren Polyurethan-Schaumstoffen
US3640920A (en) * 1969-05-21 1972-02-08 Atlas Chem Ind Rigid low-density filled cellular polyurethanes

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4177365A (en) * 1976-12-28 1979-12-04 Blackman Stanley J Moisture reducer for use in heated and vented container including electrical contacts
US4529850A (en) * 1983-08-17 1985-07-16 Robert Bosch Gmbh Ignition distributor cap
US20120138334A1 (en) * 2009-08-21 2012-06-07 Patrick Clayton Electrical insulating cap formation
US20120145435A1 (en) * 2009-08-21 2012-06-14 Patrick Clayton Electrical insulating cap formation
US8592684B2 (en) * 2009-08-21 2013-11-26 Lamina Dielectrics Limited Electrical insulating cap formation
US8686294B2 (en) * 2009-08-21 2014-04-01 Lamina Dielectrics Limited Electrical insulating cap formation

Also Published As

Publication number Publication date
DE2244597A1 (de) 1974-04-25
ES418672A1 (es) 1976-02-16
DE2244597B2 (de) 1979-04-12
BR7306982D0 (pt) 1974-07-11
FR2199169A1 (enrdf_load_stackoverflow) 1974-04-05
DE2244597C3 (de) 1979-11-29
FR2199169B1 (enrdf_load_stackoverflow) 1977-05-20
IT1001540B (it) 1976-04-30
JPS5047041A (enrdf_load_stackoverflow) 1975-04-26
SE393663B (sv) 1977-05-16
GB1439700A (en) 1976-06-16

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