US3838207A - Electrical insulating member such as a distributor cap - Google Patents

Electrical insulating member such as a distributor cap Download PDF

Info

Publication number
US3838207A
US3838207A US00396193A US39619373A US3838207A US 3838207 A US3838207 A US 3838207A US 00396193 A US00396193 A US 00396193A US 39619373 A US39619373 A US 39619373A US 3838207 A US3838207 A US 3838207A
Authority
US
United States
Prior art keywords
layer
article
layers
foam
entrapped
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
US00396193A
Other languages
English (en)
Inventor
W Anselment
W Holl
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 US3838207A publication Critical patent/US3838207A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • F02P7/021—Mechanical distributors
    • F02P7/025—Mechanical distributors with noise suppression means specially adapted for the distributor

Definitions

  • a hollow insulating member has a wall which consists of two layers, one of which at least partly surrounds the other. One of these layers is composed of an electrically insulating substance whereas the other of these layers is composed of a thermally insulating foam material. Air is entrapped in the foam material, and may also be entrapped in an air gap between the two layers.
  • ABSTRACT 15 Claims 2 Drawing Figures ELECTRICAL INSULATING MEMBER SUCH AS A DISTRIBUTOR CAP BACKGROUND OF THE INVENTION
  • the invention relates generally to insulators or insulating members. More particularly, the invention relates to hollow insulators which are adapted to receive a current-conducting lead and the wall or walls of which have electrically insulating properties. Of special interest are distributor caps which are adapted to receive a current-conducting lead connected to the ignition system of a combustion engine.
  • the electrically insulating walls of the known articles of the type under discussion are composed of a solid or dense substance, and the base material for the latter is advantageously a polyester resin.
  • This particular base material is used because of its good electrical insulating properties.
  • a known article of this type is used, for example, in the motor of a motor vehicle, to seal or enclose a space therein and a large amount of heat is generated, then, if the article is cooled from exteriorly thereof, e.g., due to atmospheric changes, due to water being sprayed thereon or the like, condensation of water takes place on the inner surfaces of the walls of the article.
  • the invention provides, as a novel article of manufacture, a hollow insulating member, particularly a distributor cap adapted to receive at least one current-conducting lead connected to the ignition system of a combustion engine, which comprises a wall having a first layer composed of an electrically insulating substance, and a second layer composed of a thermally insulating material.
  • a distributor cap adapted to receive at least one current-conducting lead connected to the ignition system of a combustion engine, which comprises a wall having a first layer composed of an electrically insulating substance, and a second layer composed of a thermally insulating material.
  • One of the layers surrounds at least a portion of the other of the layers and the wall has at least one body of air entrapped therein.
  • the first and second layers may be fast with one another. Due to the provision of a thermally insulating layer, the degree of water condensation on the inner surface or surfaces of the novel article when the latter is heated and a cold substance is applied to the outer surface or surfaces of the same, is substantially less than in the known constructions.
  • FIG. 1 is a perspective view, partly in section, of a distributor cap according to one embodiment of the invention.
  • FIG. 2 is a view similar to FIG. 1, but showing another embodiment of the invention.
  • the wall of the cap 1 comprises an electrically insulating layer 2, that is, the layer 2 is of an electrically insulating substance.
  • the layer 2 issubstantially cup-shaped and is composed of a dense substance.
  • the material of the layer 2 is a polyester resin.
  • the layer 2 may have a thickness of substantially 2 to 4 millimeters, a currently preferred thickness being about 3 millimeters.
  • the cap 1 has a tubular wall portion and another wall portion which extends transversely to the axis of the tubular wall portion so that the cap I has the form of a hollow body.
  • the transverse wall portion is provided with tubular projections 3, 4, 5, 6 and 7 each of which is adapted to receive a non-illustrated currentconducting lead.
  • the middle projection 3 is adapted to receive a lead connected to the ignition coil provided in the ignition system of a combustion engine and to which the ignition voltage derived from the secondary winding of the ignition coil is supplied.
  • each of the projections 4, 5, 6 and 7 is adapted to receive a lead which distributes the ignition voltage to the spark plugs provided in the respective cylinders of the combustion engine.
  • the projections 3, 4, 5, 6 and 7 may be formed integrally with the cap 1 if desired, and this is the case in the embodiment shown in FIG. 1.
  • the wall of the cap 1 is further provided with a heat or thermally insulating sleeve or jacket 8.
  • the sleeve 8 is shown as being in the form of a layer 9 composed of a foam material.
  • the layer 9, which may be fast with or connected with the layers 2, is illustrated here as being provided exteriorly of the layer 2 although it might also be provided interiorly thereof. It may be seen that the layer 9 surrounds at least a portion of the layer 2.
  • the layer 9 may be provided on the layer 2 in simple fashion by selecting for the layer 9 a hard foam which, during production of the cap 1, may be formed as a coating on the exterior of the electrically insulating layer 2 by spraying or injection molding. It is preferable to use a closed-cell hard foam (a foam material wherein the cells do not communicate with one another) or, at least, a hard foam having a substantially non-porous outer surface. The reason is to prevent penetration of dirt and moisture into the cells of the foam material, since this could destroy the effectiveness of the layer 9 as a thermal insulator. It has been found that a polyurethane foam is particularly, although not exclusively, suitable for this purpose.
  • the layer 9 of the thermally insulating sleeve 8 may also be composed of an elastic material.
  • An elastic foam material such as, for example, foam rubber, is especially suitable in such an instance, although other elastic materials may also be used.
  • the sleeve 8 may be fastened to or connected with the cap 1 by providing the former with a shape which corresponds to that of the cap 1 but choosing the inner dimensions of the sleeve 8 to be smaller than the outer dimensions of the layer 2.
  • the sleeve 8 By then prestressing the sleeve 8, placing the same over the layer 2 and the pro jections 3, 4, 5, 6 and 7 and then releasing the tension, the sleeve 8 is held in an expanded state by the layer 2 and thereby caused to elastically bear against the same.
  • This type of construction of the sleeve 8 has the advantage that it may be subsequently provided on distributors which have already been mounted, whenever desired.
  • foam i.e., cellular
  • the use of foam (i.e., cellular) material for the layer 9 is highly advantageous, because the body of air entrapped in the totality of cells of the layer 9 acts as a very efficient insulator.
  • the employment of the layer 9 makes it possible to make the layer 2 of lesser thickness, since the layer 2 now exclusively has an electrically insulating function, and thus to save material and reduce manufacturing expenses.
  • the cap 1 can now also be lighter in weight, a consideration which may be of importance in some circumstances.
  • FIG. 2 is largely similar to that of FIG. l, and like reference numerals have been used to designate like elements.
  • the layer 10 which replaces the layer 9 of FIG. 1, is spaced from the layer 2 and defines with the same an airgap 11.
  • the layer 10 may be of rigid synthetic plastic material, for example of solid (non-foamed) polyester, of polyester or polypropylene foam, or rigid polyurethane foam having a non-cellular integral skin. Openings 12 are provided, through which the tubular portions 3, 4, 5, 6 and 7 extend to the exterior of layer 10.
  • the body of air entrapped in the gap 11 provides excellent thermal insulating properties, which are further improved if the layer 10 is of foam material and thus contains additional air which is entrapped in its cells.
  • the layer 10 can be applied subsequently to an already mounted distributor.
  • the layers 2 and 10 are releasably connected, the layer 10 being provided with the illustrated radially inwardly extending projections 14, which are located between respective circumferentially spaced axial slots 13 and which each snap behind a bevel 15 provided on the layer 2 at the open side of the cap 1.
  • the layer 10 has a portion of enlarged inner diameter.
  • the shoulder 16 formed at the juncture between the smaller and the larger inner diameter engages a bead 17 formed on the layer 2.
  • the juxtaposed surfaces of the layers 2 and 10 may be provided with projections 18 (only one shown) which serve to maintain these layers at the desired spacing, to thus create and maintain the gap 11.
  • the novel article has been illustrated in the form of a distributor cap, but is not limited to this application. It could as well be an ignition coil housing or a part thereof, for example, a closure cap for such a housing, or be used in still a different form and for a still different application.
  • a hollow insulating member having an open end and a closed end, particularly a distributor cap adapted to receive at least one current-conducting lead connected to the ignition system of a combustion engine, comprising a wall having a first layer composed of an electrically insulating substance, a second layer composed of a thermally insulating material, one of said layers being an outer layer and surrounding at least a portion of the other of said layers which is an inner layer, said wall having at least one body of air entrapped therein; a bead located on an outer surface of the inner layer of said wall, a shoulder located on an inner surface of the outer layer of said wall engaging said bead, so as to at least in part connect said inner layer to said outer layer, and a plurality of tubular projections extending from said closed end and each adapted to receive a current-conducting lead.
  • said elastic material is a foam material having cells wherein said body of air is entrapped.

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)
  • Insulating Bodies (AREA)
US00396193A 1972-09-12 1973-09-11 Electrical insulating member such as a distributor cap Expired - Lifetime US3838207A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2244583A DE2244583C3 (de) 1972-09-12 1972-09-12 Kappe aus elektrischem Isolierstoff zum Abdecken eines Zündverteilerbzw. Zündspulengehäuses

Publications (1)

Publication Number Publication Date
US3838207A true US3838207A (en) 1974-09-24

Family

ID=5856036

Family Applications (1)

Application Number Title Priority Date Filing Date
US00396193A Expired - Lifetime US3838207A (en) 1972-09-12 1973-09-11 Electrical insulating member such as a distributor cap

Country Status (9)

Country Link
US (1) US3838207A (enrdf_load_stackoverflow)
JP (1) JPS4992431A (enrdf_load_stackoverflow)
BR (1) BR7307029D0 (enrdf_load_stackoverflow)
DE (1) DE2244583C3 (enrdf_load_stackoverflow)
ES (1) ES418671A1 (enrdf_load_stackoverflow)
FR (1) FR2199210B1 (enrdf_load_stackoverflow)
GB (1) GB1444766A (enrdf_load_stackoverflow)
IT (1) IT993206B (enrdf_load_stackoverflow)
SE (1) SE393840B (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD267642S (en) 1980-11-17 1983-01-18 Minnesota Mining And Manufacturing Co. Conical double end cap for use with a cable splice case
USD267641S (en) 1980-11-17 1983-01-18 Minnesota Mining And Manufacturing Co. Conical single end cap for use with a cable splice case
USD267643S (en) 1980-11-17 1983-01-18 Minnesota Mining And Manufacturing Co. Conical triple end cap for use with a cable splice case
USD267943S (en) 1980-11-17 1983-02-15 Minnesota Mining And Manufacturing Company Conical double end cap for use with a cable splice case
EP0245761A1 (de) * 1986-05-15 1987-11-19 Adam Opel Aktiengesellschaft Manschettenförmige Entstörabschmirmung für Zündverteiler an Brennkraftmaschinen
ES2119619A1 (es) * 1994-02-24 1998-10-01 Bosch Gmbh Robert Casquillo de apantallamiento para un distribuidor de encendido.
US20220195973A1 (en) * 2020-12-17 2022-06-23 Hsun Chien Huang Distributor with heat dissipation effect

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3329647C2 (de) * 1983-08-17 1993-10-28 Bosch Gmbh Robert Zum Abdecken eines Zündverteilers dienende Isolierstoffkappe
JP2529409B2 (ja) * 1989-09-14 1996-08-28 株式会社日立製作所 内燃機関用配電器

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2782251A (en) * 1952-11-29 1957-02-19 Belden Mfg Co Cables for high frequency use
US3009986A (en) * 1960-02-23 1961-11-21 Kearney James R Corp Protector sleeve for electrical connector
US3037652A (en) * 1956-09-18 1962-06-05 Owens Illinois Glass Co Receptacle having protective coating
US3243504A (en) * 1964-09-04 1966-03-29 Russell W Johnson Terminal insulators
DE1932127A1 (de) * 1969-06-25 1971-01-21 Daimler Benz Ag Zuendverteiler an insbesondere Kraftfahrzeug-Brennkraftmaschinen
DE2011242A1 (en) * 1970-03-10 1971-09-30 Reklame Conrad Wilden Navhf Distributor for otto engines
US3625785A (en) * 1968-04-10 1971-12-07 Tetra Pak Ab Method of producing a mechanically stiff gastight packaging container

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1569101A (en) * 1924-09-23 1926-01-12 Vaughn John Preston Protector for distributor wires
SE334062B (enrdf_load_stackoverflow) * 1966-09-14 1971-04-05 R Terneus
DE2207174A1 (de) * 1972-02-16 1973-08-23 Matthias Mans Verfahren zur trockenhaltung von verteilerkappen fuer die stromverteilung an explosionsmaschinen

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2782251A (en) * 1952-11-29 1957-02-19 Belden Mfg Co Cables for high frequency use
US3037652A (en) * 1956-09-18 1962-06-05 Owens Illinois Glass Co Receptacle having protective coating
US3009986A (en) * 1960-02-23 1961-11-21 Kearney James R Corp Protector sleeve for electrical connector
US3243504A (en) * 1964-09-04 1966-03-29 Russell W Johnson Terminal insulators
US3625785A (en) * 1968-04-10 1971-12-07 Tetra Pak Ab Method of producing a mechanically stiff gastight packaging container
DE1932127A1 (de) * 1969-06-25 1971-01-21 Daimler Benz Ag Zuendverteiler an insbesondere Kraftfahrzeug-Brennkraftmaschinen
DE2011242A1 (en) * 1970-03-10 1971-09-30 Reklame Conrad Wilden Navhf Distributor for otto engines

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD267642S (en) 1980-11-17 1983-01-18 Minnesota Mining And Manufacturing Co. Conical double end cap for use with a cable splice case
USD267641S (en) 1980-11-17 1983-01-18 Minnesota Mining And Manufacturing Co. Conical single end cap for use with a cable splice case
USD267643S (en) 1980-11-17 1983-01-18 Minnesota Mining And Manufacturing Co. Conical triple end cap for use with a cable splice case
USD267943S (en) 1980-11-17 1983-02-15 Minnesota Mining And Manufacturing Company Conical double end cap for use with a cable splice case
EP0245761A1 (de) * 1986-05-15 1987-11-19 Adam Opel Aktiengesellschaft Manschettenförmige Entstörabschmirmung für Zündverteiler an Brennkraftmaschinen
ES2119619A1 (es) * 1994-02-24 1998-10-01 Bosch Gmbh Robert Casquillo de apantallamiento para un distribuidor de encendido.
US20220195973A1 (en) * 2020-12-17 2022-06-23 Hsun Chien Huang Distributor with heat dissipation effect
US11585311B2 (en) * 2020-12-17 2023-02-21 Hsun Chien Huang Distributor with heat dissipation effect

Also Published As

Publication number Publication date
IT993206B (it) 1975-09-30
ES418671A1 (es) 1976-03-01
FR2199210B1 (enrdf_load_stackoverflow) 1976-05-14
JPS4992431A (enrdf_load_stackoverflow) 1974-09-03
SE393840B (sv) 1977-05-23
DE2244583C3 (de) 1979-11-29
DE2244583A1 (de) 1974-03-21
DE2244583B2 (de) 1979-03-29
GB1444766A (en) 1976-08-04
FR2199210A1 (enrdf_load_stackoverflow) 1974-04-05
BR7307029D0 (pt) 1974-06-27

Similar Documents

Publication Publication Date Title
US3838207A (en) Electrical insulating member such as a distributor cap
US3731126A (en) Electrical machine with shielded circuit parts
US6259344B1 (en) Ignition component for internal combustion engines
JPS5940416A (ja) 電気部品のための高電圧絶縁体
US5074390A (en) Cylinder piston device
JPH061737B2 (ja) 内燃機関の点火装置用点火コイル
GB1563685A (en) Longitudinal sealing of electric cables
GB1027113A (en) Dynamo-electric machine
US4437719A (en) Connector for automotive ignition devices
US1253265A (en) Brush for electrical apparatus.
US2499823A (en) Spark plug and method of making the same
US3167675A (en) Dynamo-electric machine having lamellar windings and plane axial air gap
JPH0423392B2 (enrdf_load_stackoverflow)
GB1420582A (en) Insulating caps for electrical components
GB1439700A (en) Insulating element
US1730136A (en) Insulating bushing
KR102347791B1 (ko) 홀더 생산 방법
JPH08339928A (ja) 内燃機関用点火コイル
KR19990011473U (ko) 엔진 마운팅용 인슐레이터 구조
US3086073A (en) High voltage liquid-free insulating bushing with improved voltage distribution
KR970069832A (ko) 합성수지제 단열 용기 및 합성수지제 단열 덮개
JPS6216035A (ja) モ−ルド形ステ−タ
US805167A (en) Insulator-pin.
JPS5843187Y2 (ja) 内燃機関用点火栓キャップ
US20040075517A1 (en) Rod coil for ignition systems