JP2005229120A - Rod-shaped ignition coil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To guarantee an excellent buffer action between an ignition coil and an ignition plug in a rod-shaped ignition coil for an ignition device having a substantially the same cylindrical casing wall as the coil body, where a contact member is disposed on a high tension side to accommodate a connection pin of the ignition plug and the contact member in a form that has an elastic buffer member is improved, and further to obtain a configuration technically facilitating to manufacture the ignition coil. <P>SOLUTION: The elastic buffer member is disposed at a cutout in the contact member such that the member is directly contacted with the connection pin of the ignition plug, and the buffer member must be at least partially contacted with the circumferential side of the contact member or the connection pin of the ignition plug. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a rod ignition coil for an ignition device, and more particularly to a rod ignition coil for use in an internal combustion engine of an automobile. This rod-shaped ignition coil has a coil body and a substantially cylindrical casing wall. In this case, in order to receive the connection pin of the spark plug, a contact member is arranged on the high voltage side, and the contact member has an elastic buffer member.

  Such a bar ignition coil is known from German patent specification DE 199 28 820 C1 and is used to supply a high voltage to the spark plug of an internal combustion engine of a motor vehicle.

  The known rod-shaped ignition coil is substantially cylindrical and has a concentric structure having a coil body in the center and surrounded by a feedback connecting plate. The coil body surrounds a rod-shaped core made of a magnetizable material disposed in the center, and a secondary coil body and a secondary coil on which a secondary coil connectable to a spark plug is disposed. And a primary coil body that holds a second coil configured as a primary coil. The second coil is coupled to a connection for connecting to a low voltage source. The return connection plate forms a casing wall into which the resin material is partially injected.

A contact member is arranged on the high voltage side for receiving the connection pin of the spark plug, and the contact member has an elastic buffer member disposed between the bar coil and the spark plug. The buffer member is configured as a plate-like portion made of an elastic material, and cushions the contact member in the axial direction with respect to the bar-shaped coil. Since the contact member must ensure a reliable electrical contact with the spark plug on the high voltage side, a conductive coupling must occur between the contact member and the secondary coil. However, the known buffering of the contact member against the rod ignition coil is expensive to obtain the coupling. This is because the shock-absorbing member itself must be electrically conductive, or a bypass wire must be provided to bridge the shock-absorbing member. Both configurations require significant manufacturing costs.
DE19927820C1

  The object of the present invention is to provide a bar coil which guarantees a particularly good buffer between the ignition coil and the spark plug and which can be constructed particularly easily in terms of production technology.

  An object of the present invention is a rod-shaped coil for ignition equipment, in particular a rod-shaped ignition coil for use in an internal combustion engine of an automobile, comprising a coil body and a substantially cylindrical casing wall, In the type in which the contact member is arranged on the high voltage side to receive the connection pin of the contact member, and the contact member has an elastic buffer member, the elastic buffer member is in the notch in the contact member. The problem is solved by being arranged in direct contact with the connection pin of the spark plug, and the contact member being at least partially in contact with the connection pin of the spark plug on the circumferential surface side.

According to the present invention, the elastic cushioning member is disposed in the notch in the contact member and in direct contact with the connection pin of the spark plug. This already allows direct axial cushioning between the spark plug and the contact member, so that the spark plug is not mounted in tight contact with the contact member. Further, the contact member is at least partially brought into contact with the connection pin of the spark plug on the circumferential surface side. This ensures a secure and conductive connection between the connection pin of the spark plug and the secondary coil directly connected to the contact member.
In addition to the axial damping that is particularly desired, in order to allow a radial damping perpendicular to this between the spark plug and the ignition coil, the elastic cushioning member forms part of the spark plug connection pin. It is possible to form a kind of “bowl” that surrounds and supports the end of the connecting pin facing the ignition coil.

  The elastic cushioning member may be disk-shaped or cup-shaped and the notch in the contact member may be configured in a generally bowl shape to receive the cushioning member. This ensures a reliable reception of the buffer member in the contact member.

  In this case, it is not necessary for the cushioning member to be electrically conductive, and the resilient cushioning member can be made of, in particular, an elastomer, rubber or similar elastic material.

  In order to prevent the rod-shaped coil according to the invention from swinging, the intermediate chamber between the coil body and the casing wall can likewise be filled with elastomer, rubber or similar elastic material.

  In a particularly advantageous manner, the notch in the contact member is connected to the intermediate chamber via a through-hole, and the notch is at least partly filled when the intermediate chamber is filled with elastomer, rubber or similar elastic material. Can be filled with the above material. Advantageously, the formation of the cushioning member 20 and the filling of the intermediate chamber 11 from an elastomer, rubber or similar material can be carried out in the same method steps.

  Furthermore, the notch in the contact member can have a through hole as a connection to the inner chamber in the rod-shaped ignition coil additionally limited by the casing wall. In this case, the buffer member seals the inner chamber toward the connection pin of the spark plug.

  In order to electrically cut off the coil body and the return connection plate, an insulating sheet and / or a gap may be additionally or selectively provided between the coil body and the casing wall.

  Furthermore, the intermediate chamber can optionally be filled with an injection material. The injection material can usually be, for example, an epoxy resin.

  The connection pin of the spark plug may have a notch that engages a spring member that secures the connection pin with the contact member. Such a notch can be a component of a standardized profile of the connection pin, for example an SAE profile.

  In order to be particularly moisture-tight, the casing wall can have a plastic coating at least in regions. In this case, in an advantageous configuration, a protective jacket for a spark plug surrounding the contact member on the peripheral surface side can be integrally injection-molded on the high voltage side. Thereby, on the one hand, contact of the spark plug protected against moisture is achieved, and on the other hand, radial shock buffering and protection against damage is achieved.

  Further advantages and advantageous configurations of the invention are described in the specification and the claims.

  1 and 2 show the connection region on the high voltage side of the rod-shaped ignition coil. This connection region has a contact member 18 for coupling with the connection pin 14 of the spark plug 16. The rod-shaped ignition coil can be inserted into a shaft (not shown) in a cylinder head of an automobile internal combustion engine. The bar ignition coil has a substantially cylindrical casing wall 12 as a feedback plate for closing the magnetic circuit of the bar ignition coil. In addition to the casing, the bar coil is constructed in a conventional manner and surrounds a bar core made of a magnetizable material and has a secondary coil winding, a secondary coil, a primary coil winding and a primary coil. A coil body 10 is provided. The primary coil is connected to a connection for a low voltage source, not shown in the usual form, while the secondary coil supplies a high voltage and can be connected to the spark plug 16 via the contact member 18.

  The elastic buffer member 20 is arranged in a bowl-shaped notch 22 in the contact member 18 so as to make direct contact with the connection pin 14 of the spark plug 16. The elastic buffer member 20 is made of an elastomer. Optionally, rubber or similar elastic material can be used. The intermediate chamber 11 between the coil body 10 and the casing wall 12 can likewise be filled with elastomer, rubber or similar elastic or injection material.

  There may be a gap between the coil body 10 and the casing wall 12 according to an alternative embodiment not shown. In this case, an insulating sheet can be additionally disposed between the coil body 10 and the casing wall 12.

The contact member 18 has a notch 22 at 18 and a through hole 26 as a connection to an inner chamber 27 limited by the casing wall 12 of the rod-shaped ignition coil. In this case, the inner chamber 27 can also be referred to as a casting chamber. This is because the inner chamber 27 is filled with a plastic resin or similar injection material. In this case, the buffer member 20 acts as a seal between the inner chamber 27 and the connection pin 14 of the spark plug 16.
Around the casing wall 12, plastic is injection-molded, thus forming a casing that is dense and watertight of the filling material. In this case, a protective jacket 32 for the spark plug 16 surrounding the contact member 18 on the circumferential side is additionally formed on the high voltage side. This protective jacket 32 serves primarily to protect the spark plug or spark plug head against moisture.

  In addition or alternatively, a thermoplast (not shown) on the high-voltage side can be injection-molded on the casing wall 12 forming, for example, a high-voltage dome by the 2K method or the two-component method.

  The embodiment of FIG. 1 has a substantially disc-shaped part as a separate part that is inserted or press fitted into a generally bowl-shaped notch 22 in the contact member 18 as an elastic cushioning member 20. This disc-shaped part is useful for axial cushioning.

  Optionally, the separate cushioning member can also be configured in a bowl shape. In this case, the elastic buffer member partially surrounds the connection pin 14 of the spark plug 16. The edge region of the bowl-shaped cushioning member additionally serves for radial cushioning.

  In the embodiment shown in FIG. 1, the contact member 18 is in contact with the circumferential surface of the connection pin 14 of the spark plug 16. Thus, contact is achieved and ensured by press fitting the connection pin to the contact member.

  In the embodiment shown in FIG. 2 as well, an elastic cushioning member 20 configured in a disc shape and disposed in the notch 22 of the contact member 18 is shown. The notch 22 in the contact member 18 is connected to the intermediate chamber 11 between the coil body 10 and the casing wall 12 through a through hole 24. The through hole 24 serves to fill the notch 22 at least partially with the material when the intermediate chamber 11 is filled with elastomer, rubber or similar elastic material. Thereby, the filling of the intermediate chamber 11 and the formation of the buffer member 20 are integrated.

  The disk-shaped buffer member 20 serves for buffering in the axial direction. The selectively integrated elastic cushioning member can also be configured in a bowl shape. In this case, the buffer member partially surrounds the connection pin 14 of the spark plug 16. The bowl-shaped cushioning member additionally provides radial cushioning.

  The contact member 18 contacts the connection pin 14 of the spark plug on the circumferential side. In order to ensure that the connection pin 14 of the spark plug 16 is fixed in a contact state, the connection pin 14 has a notch 28, and a spring member 30 that engages the contact member 18 is in contact with the notch 28. The member 18 is engaged to secure the connection pin 14. In this case, the spring member 30 can also be configured to be able to engage with a standardized profile of the connecting pin 14, for example an SAE profile.

The cut | disconnection side view of the connection area | region of the high voltage side of one Example of the rod-shaped ignition coil of this invention. The cut | disconnection side view of the connection area | region of the high voltage side of another Example of the rod-shaped ignition coil of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Coil body, 11 Intermediate | middle chamber, 12 Casing wall, 14 Connection pin, 16 Spark plug, 18 Contact member, 20 Buffer member, 22 Notch, 24 Transparent hole, 26 27 Inner chamber, 28 Notch, 30 Spring member, 32 Protective cloak

Claims (13)

  Rod ignition coil for an ignition device, in particular a rod ignition coil for use in an internal combustion engine of an automobile, comprising a coil body (10) and a substantially cylindrical casing wall (12), A contact member (18) is arranged on the high voltage side for receiving the connection pin (14) of the plug (16), and the contact member (18) has an elastic buffer member (20). In the type, the elastic cushioning member (20) is arranged in direct contact with the connection pin (14) of the spark plug (16) at the notch (22) in the contact member (18). The bar-shaped ignition coil is characterized in that the contact member (18) is at least partially brought into contact with the connection pin (14) of the spark plug (16) on the circumferential surface side.   2. The bar ignition coil as claimed in claim 1, wherein the resilient cushioning member (20) partially surrounds the connecting pin (14) of the spark plug (16).   The elastic buffer member (20) is substantially disc-shaped or bowl-shaped, and the notch (22) in the contact member (18) is substantially bowl-shaped to receive the buffer member (20). The rod-shaped ignition coil according to claim 1 or 2.   The bar ignition coil according to any one of claims 1 to 3, wherein the elastic cushioning member (20) is made of elastomer, rubber or similar material.   The intermediate chamber (11) between the coil body (10) and the casing wall (12) is filled with an elastomer, rubber or similar elastic material. Bar ignition coil.   The notch (22) in the contact member (18) is connected to the intermediate chamber (11) through a through hole (24), and the intermediate chamber (11) is made of elastomer, rubber or similar elastic material. 6. A bar ignition coil according to claim 5, wherein the notch (22) is at least partially fillable when filling with a typical material.   The notch (22) in the contact member (18) has a through hole (26) as a connection to an inner chamber (27) limited by a casing wall (12) of a rod-shaped ignition coil, The rod-shaped ignition coil according to any one of claims 1 to 6, wherein the buffer member (20) seals the inner chamber (27) toward the connection pin (14) of the spark plug (16). .   6. The bar ignition coil as claimed in claim 1, wherein there is a gap between the coil body (10) and the casing wall (12).   6. The bar ignition coil as claimed in claim 1, wherein the intermediate chamber between the coil body (10) and the casing wall (12) is filled with an injection material.   The rod-shaped ignition coil according to any one of claims 1 to 9, wherein an insulating sheet is provided between the coil body (10) and the casing wall (12).   The connection pin (14) of the spark plug (16) has a notch (28) with which a spring member (30) engages to secure the connection pin (14) in the contact member (18). Item 11. The rod-shaped ignition coil according to any one of Items 1 to 10.   11. Bar ignition coil according to claim 1, wherein the casing wall (12) has a plastic injection-molded coating layer at least in a region.   The rod-shaped ignition coil according to claim 12, wherein a protective jacket (32) for a spark plug (16) surrounding the contact member (18) on the peripheral surface side on the high voltage side is injection-molded.

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