阅读说明：本技术 点火线圈 (Ignition coil ) 是由 S·舒姆 M·阿道夫 T·施蒂费尔 D·维斯滕哈根 M·鲍尔 A·施塔克 于 2020-01-14 设计创作，主要内容包括：描述了一种点火线圈,其包括：壳体(1),其具有用于连接至火花塞的管状壳体部分(3),以及销形干扰抑制电阻器(4),其布置在管状壳体部分(3)中。根据本发明,其规定壳体(1)包围具有漏斗形部分(5)的内部,该漏斗形部分(5)朝向管状壳体部分(3)逐渐变细。此外,描述了一种用于制造这种点火线圈的方法。(An ignition coil is described, comprising: a housing (1) having a tubular housing part (3) for connection to a spark plug, and a pin-shaped interference suppression resistor (4) arranged in the tubular housing part (3). According to the invention, it is provided that the housing (1) encloses an interior having a funnel-shaped portion (5), which funnel-shaped portion (5) tapers towards the tubular housing portion (3). Furthermore, a method for producing such an ignition coil is described.)

1. The ignition coil includes:

a housing (1) having a tubular housing portion (3) for connection to a spark plug, and

a pin-shaped interference suppression resistor (4) arranged in the tubular housing part (3),

it is characterized in that the preparation method is characterized in that,

the housing (1) encloses an interior having a funnel-shaped portion (5), the funnel-shaped portion (5) tapering towards the tubular housing portion (3).

2. Ignition coil according to claim 1, characterized in that a part of the funnel-shaped inner part (5) is arranged in the tubular housing part (3).

3. Ignition coil according to any one of the preceding claims, characterised in that a part of the funnel-shaped inner part (5) is arranged in a housing part (6) connected with the tubular housing part (3).

4. An ignition coil according to claim 3, characterised in that the housing part (6) connected to the tubular housing part (3) tapers on its outside towards the tubular housing part (3).

5. Ignition coil according to any of the preceding claims, characterized in that the funnel-shaped inner part (5) contacts an inner part in which a transformer is arranged.

6. An ignition coil according to any one of the preceding claims, characterized in that the interference suppression resistor (4) is pressed into the tubular housing part (3).

7. An ignition coil according to any one of the preceding claims, characterised in that the funnel-shaped inner part (5) has a width at its end facing away from the tubular housing part (3), which is at least four fifths of the length of the interference suppression resistor (4), preferably at least equal to the length of the interference suppression resistor (4).

8. Ignition coil according to any of the preceding claims, characterized in that the tubular casing part (3) is a double-walled casing part.

9. Ignition coil according to any one of the preceding claims, characterized in that the funnel-shaped inner part (5) has an opening angle whose value decreases towards the interference suppression resistor (4).

10. A method of manufacturing an ignition coil comprising the steps of:

producing a housing cup having a tubular housing part (3) at the bottom end and surrounding a funnel-shaped inner part (5), the funnel-shaped inner part (5) guiding an interference suppression resistor (4) inserted in the housing cup to the tubular housing part (3),

inserting the interference suppression resistor (4) into the housing cup,

pressing the interference suppressing resistor (4) guided to the tubular housing part (3) by the funnel-shaped inner part (6) into the tubular housing part (3),

connecting the transformer to an interference suppression resistor (4), an

Pouring an electrically insulating sealant into the housing cup.

Technical Field

From DE 102017116277 a1, it is known that the invention is based on an ignition coil having the features listed in the preamble of claim 1.

Background

Such an ignition coil comprises a housing in which a transformer is arranged. The housing has a tubular portion designed as a plug for connecting the ignition coil to a spark plug. In the tubular housing part, a pin-shaped interference suppression resistor connected to the transformer is arranged.

In the ignition coil known from DE 102017116277 a1, the interference dummy resistor is held by a plastic sleeve which is inserted into the tubular housing part.

Disclosure of Invention

The object of the invention is to show how to manufacture an ignition coil at a lower cost.

This problem is solved by an ignition coil having the features listed in claim 1 and a method according to claim 10. Advantageous developments of the invention are the subject matter of the dependent claims.

In the ignition coil according to the present invention, the interior surrounded by the housing has a funnel-shaped portion which tapers toward the tubular housing portion. In this way, the mounting of the pin-shaped interference suppression resistor in the tubular housing part is substantially simplified. No complicated steps are required to align the pin-shaped interference suppression resistors during assembly. It is sufficient to put the pin-shaped interference suppressing resistor into the housing. Gravity forces the pin-shaped interference suppression resistor into the funnel-shaped housing part. Thus, after the insertion of the pin-shaped interference suppressing resistor into the housing, the pin-shaped interference suppressing resistor is advantageously pressed into the tubular housing part without the need for a previously complicated positioning.

An advantageous development of the invention provides that a part of the funnel-shaped inner part is arranged in the tubular housing part. The housing can advantageously be of compact design, since the funnel-shaped inner part projects into the tubular housing part.

A further advantageous development of the invention provides that the funnel-shaped inner part has an opening angle, the value of which decreases towards the tubular part. In other words, the funnel formed by the inner portion becomes flatter as the distance from the interference suppression resistor increases. In this way, the funnel-shaped portion of the housing interior can be formed to an advantageously low height and nevertheless it can be ensured that the interference suppression resistor inserted into the interior is guided into the tubular housing portion through the funnel-shaped interior portion. Since the funnel-shaped inner part has an opening angle, the width of which decreases towards the tubular part, the housing can advantageously be designed compactly.

Drawings

Further details and advantages of the invention are illustrated by way of example embodiments with reference to the accompanying drawings.

FIG. 1 shows an illustrative embodiment of an ignition coil according to the present invention; and

fig. 2 shows a schematic cross-sectional view of a part of a housing with a pin-shaped interference suppression resistor.

Detailed Description

The ignition coil shown in fig. 1 comprises a housing 1, which housing 1 forms a first connection plug 2 for connection to a power source (e.g. the vehicle electrical system of a vehicle) and has a tubular housing part 3, which tubular housing part 3 forms a second connection plug 3 for connection to a spark plug. Fig. 2 shows a schematic sectional view of an ignition coil in the region of the tubular housing part 3.

As shown in fig. 2, an interference suppressing resistor 4 is arranged in the tubular housing portion 3. The interference suppression resistor 4 is electrically connected to a transformer arranged in the housing 1, not shown in fig. 2 for simplicity. As shown in fig. 2, the interior enclosed by the housing 1 has a funnel-shaped portion 5, which funnel-shaped portion 5 tapers towards the tubular housing portion 3. The housing 1 can be designed, for example, as a housing cup (housing cup) which is closed by a lid.

To assemble the ignition coil, the interference suppression resistor 4 is put into the case 1. The funnel-shaped inner portion 5 then brings the interference suppression resistor 4 under the influence of gravity into the tubular housing portion 3. The interference suppression resistor 4 can then be pressed into the tubular housing part 3 in a further assembly step without complicated alignment. The interference suppressing resistor 4 is then held firmly in the tubular housing part 3. Subsequently, the transformer is inserted into the housing 1 and connected to the interference suppression resistor 4. The housing cup may then be filled with an electrically insulating sealant.

The funnel-shaped inner portion 5 may for example have the shape of a truncated cone. In the shown embodiment, the funnel formed by the funnel-shaped inner portion has an opening angle, the value of which decreases towards the tubular portion. In other words, the funnel is therefore steepest at its end facing the interference suppression resistor 4 and becomes flatter towards its opposite end. In this way, the funnel-shaped inner part 5 can advantageously be designed flat and thus compact and still reliably guide the interference suppression resistor 4 inserted into the housing cup into the tubular housing part 3 during assembly.

The funnel-shaped inner portion 5 may extend into the tubular housing part 3, for example as shown in fig. 2. Preferably, however, the funnel-shaped inner portion 5 is not arranged completely in the tubular housing portion 3, but also extends into the adjacent housing portion 6. Adjacent to the tubular housing part 3 and in which a part of the funnel-shaped inner part 5 is arranged, the housing part 6 can taper towards the tubular housing part 3 on its outside, for example it can also be the outside of the funnel shape.

The funnel-shaped inner part 5 has, on its end facing away from the tubular housing part 3, a width which is at least four fifths of the length of the interference suppression resistor 4, preferably at least equal to the length of the interference suppression resistor 4. In this way, the interference suppression resistor 4 is guided particularly reliably into the tubular housing part 3 during assembly.

The tubular housing part 3 may be designed as a double-walled housing part. In this way, the pressing of the interference suppression resistor 4 can be facilitated and the electrical insulation thereof can be improved.

List of reference numerals

1 casing

2 connecting plug

3 tubular housing part

4 interference suppression resistor

5 funnel-shaped part

6 housing part