JP3056878U - Ignition device for internal combustion engine - Google Patents

Abstract

(57) Abstract: An ignition device provided with an ignition coil (12) for an internal combustion engine, wherein the ignition coil uses a high voltage connection part (22) to connect to an ignition plug (21) in a shaft (17) of the internal combustion engine. Of the type mounted and held by the crimp portion 32 via the first connecting portion 27 at the end,
A second coupling part 37 in which the ignition coil is provided with a first locking element 42 and comprises a second locking element 41 arranged corresponding to the first locking element
Are engaged with each other in a form-locking manner. According to the present invention, the ignition coil is supported in the cylinder head 16 in a state in which rotation due to vibration is reliably prevented, so that the function of the ignition coil, that is, the contact of the ignition coil is reliably ensured.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The invention relates to an ignition device of the type recited in the preamble of claim 1.

[0002]

[Prior art]

 An ignition device of this type for a multi-cylinder internal combustion engine is known from DE-A-196 04 105 A1, in which a number of ignition coils corresponding to the number of cylinders of the internal combustion engine are provided in the shaft of the cylinder head. It is plugged in and connected to a permanently installed spark plug.

The holding of each ignition coil takes place via both end sections of the tubular ignition coil in the basic structure. At a first end section directed at the spark plug, a high-voltage dome partially surrounds the insulation of the associated spark plug in a centered manner. A coil spring is supported in the high-voltage dome, and the coil spring is frictionally connected (Kraftschluss) to the high-voltage connection of the ignition plug in a preloaded state (vorge spanner) and ignited by the return force of the coil spring. The second end section of the coil is pressed against a holding element which clamps all ignition coils.

[0004] The ignition coil has a truncated cone-shaped damping element made of an elastic material in the second end section, the damping element projecting into a corresponding receiving part of the holding element in a longitudinal section, The ignition coil is positioned.

[0005] A disadvantage of this type of holding of the ignition coils is that the prevention of the rotation of each ignition coil is effected in a frictional connection by the return force of the coil springs, and the damping element is notched in the notch of the holding element. A friction force occurs. This results in rotational vibrations (Drehschwingung) of the ignition coil in the range of the elasticity of the shock absorber, based on the force components acting in the circumferential direction of the acceleration vibrations, especially in the case of acceleration vibrations, such as occur in internal combustion engines. Due to such rotational vibrations, on the one hand, a relative movement occurs on the contact surface between the coil spring and the high-voltage connection of the spark plug, and the resulting wear causes contact between the ignition coil and the spark plug, Eventually, the function of the ignition coil is impaired. On the other hand, rotational vibrations cause wear of the rubber tube surrounding the high-voltage dome, which in turn causes high-voltage arcing.

[0006]

[Effect of the invention]

 With the ignition device according to the invention having the features of claim 1, the advantages described above are satisfactorily improved. For this purpose, the ignition coil has a first locking element, which is engaged with the second locking element of the second coupling part. The engagement between the two locking elements forms a form-locking anti-rotation means for suppressing the rotation of the ignition coil. Such a rotation preventing means contributes to ensure that the ignition coil can function even during acceleration vibration. Claims 2 and 3 disclose advantageous configurations of the present invention.

[0007]

[Embodiment of the invention]

 An ignition device 11 such as used in a multi-cylinder internal combustion engine has a plurality of ignition coils 12 of a basic structure (inder Grundform zylinderfoermig) corresponding to the number of cylinders of the internal combustion engine. . The ignition device 11 is shown in detail in FIG. 1 for an individual cylinder. The ignition device 11 is mounted on a cylinder head 16 of an internal combustion engine via a web-like (stegfoermig) holding element 13 of the ignition device, using a mounting element 14, which is schematically shown here as a spacer tube. In the cylinder head 16, one vertically long shaft (Schacht) 17 is provided for each cylinder in the form of a hole.

Through an inlet opening 18 in the shaft 17, in the upper surface 19 of the cylinder head 16, a spark plug 21 is introduced into the shaft 17 in a known manner and is fixed in a submerged state relative to the upper surface 19. Have been. The spark plug 21 has a high-voltage connection 22 on the side facing the inlet opening 18, the high-voltage connection being an additional pin-shaped electrode 23 and an insulation surrounding the electrode 23 except at the free end. Consists of body 24.

The ignition coil 12 is formed as a rod-shaped ignition coil (Stabzue ndspule) having a cylindrical casing 26. The diameter of the casing 26 is smaller than the inner diameter of the shaft 17 by a seam play.

As a first connecting part 27 from the casing 26, a first end section 27 of the ignition coil 12 projects axially in line with the high-voltage connection 22 of the ignition plug 21, In contrast, at the other end, a second end section 28 of the ignition coil 12 projects toward the holding element 13.

The first end section 27 has a plastic sleeve-like high-voltage dome 29 projecting from the casing 26. Disposed from the free end of the high-voltage dome 29 and disposed axially in the high-voltage dome is a pin 31, which serves as a high-voltage contact element 32, for example in the form of a coil spring. It is formed and is connected to a crimping part (Anpressteil) 32 extending in the axial direction in the high-voltage dome 29, and through this crimping part, the output of the ignition coil 12 at the high-voltage connection part 22 and the spark plug 22. The electrical connection with the input is made in the axial direction flexibly and frictionally.

The high-voltage dome 29 and the high-voltage contact element 32, which also extends in the axial direction, are surrounded by a sheath 33 made of a resilient material, which has a play on the insulator 24 of the spark plug 21. It is inserted.

A second end section 28 of the spark plug 12 and a portion of the casing 26 adjacent to the end section protrude from the shaft 17. The second end section 28 is a frusto-conical plastic part which has an end face 34 extending in a radial plane and an umlaufend side 36, the side of which is in relation to the end face 34. It is almost 45 ° inclined. The second end section 28 is inserted into a becherfoermig receptacle as the second connection part 37 of the holding element 13, in which the second end part of the second connection part 37. Centered by the inner shape corresponding to the outer shape of section 28.

A side surface 36 is provided with a ring-shaped (balgfoermig) first locking element 42, which is provided on an inner side surface 38 of a second connecting portion 37. The two locking elements 41 engage without play. The locking elements 41, 42 are shown only schematically in FIG. 1, but are shown in more detail in FIGS.

As shown in FIG. 4, the end face 34 has two conductor paths 43, which are formed as slip rings and extend concentrically spaced apart from one another, ie a supply voltage connection. When the second end section 28 of FIG. 3 and the second connecting part 37 of FIG. 2 are joined, they are frictionally connected by two adjacently arranged contacts 44 formed as spring arms. Loaded (beaufschlagen). Both contacts 44 are parts of a current rail (Stromschiene) 46 which are electrically isolated from one another. The contacts 44 are stamped and formed in the current rails 46 and bent out of the stamping plane, so that they can contact the conductor tracks 43 at their free ends.

A current is supplied to the ignition coil 12 via a current rail 46 provided with a contact 44. The current rail, together with the current rail 46 for another ignition coil 12 of the igniter 11, is injection molded with a plastic around it for electrical insulation and mechanical stability to form an integral connection. As a body, it forms a central holding element 13 with a second connecting part 37 for all ignition coils 12. Alternatively, a single ignition coil 12 or each ignition coil may have more than two conductor tracks 43, each of which has a contact 44 disposed thereon.

Each second connecting part 37 has at its free end an annular locking neck (Rastkehle) oriented at the free end, as shown in FIG. In the pre-assembly means are provided as means (Vormonta gemittel) 47, axially oriented annular ridges as second pre-assembly means 48 of the second end section 28 of the ignition coil 12. (Wulst) is connected when the ignition coil 12 is inserted into the second connection portion 37. Such a connection is provided if, for manufacturing technical reasons, the holding element 13 is supplied as a complete pre-assembled unit (Vormontageeinheit) with all the ignition coils inserted into the cylinder head 16 of the internal combustion engine. An assembly assist means (Montagehilfe) is formed exclusively as a locking portion. Such a lock allows an axially directed relative movement between the ignition coil 12 and the second connection part 37, so that after insertion of said pre-assembled unit into the cylinder head 16, Due to the fixing with the mounting element 14, the return force of the high-voltage contact element 32 causes, on the one hand, a frictional connection between the contact 44 and the conductor track 43 and the electrode 23 of the spark plug 21, and on the other hand the locking element 41 , 42 are frictionally connected.

The ignition device 11 optionally inserts the ignition coil 12 individually into the shaft 17 in the axial direction towards the spark plug 21, and then holds the holding element 13 with the second connection part 37 at the ignition coil 12. And fixed to the cylinder head 16 by at least one mounting element 14.

Also in this case, due to the return force of the high-voltage contact element 32, in addition to the contact between the ignition coil 12 and the electrode 23 and the contact 44, the shape connection between the respective locking elements 41 and 42 is frictionally connected Is subsidized.

The above-mentioned connection between the locking elements 41, 42 makes it possible to prevent the rotation of the ignition coil 12 in the cylinder head 16 even under acceleration vibrations, whereby the ignition coil 12 Functional contact is assured without causing wear due to rotational vibrations.

[Brief description of the drawings]

FIG. 1 is a partially broken side view of an ignition coil as a part of an ignition device.

FIG. 2 is a sectional view of a holding portion of the ignition device.

FIG. 3 is a side view of a part of the ignition coil.

FIG. 4 is a plan view of an ignition coil.

[Explanation of symbols]

11 ignition device, 12 ignition coil, 13 holding element, 14 mounting element, 1
6 cylinder head, 17 shaft, 18 inlet opening, 19 top surface, 21 spark plug, 2
2 High voltage connection part, 23 electrode, 24 insulator, 26 casing, 27, 28 End section (coupling part), 29 high voltage dome, 31 pin, 32 high voltage contact element (crimp part), 3
3 coated body, 34 end face, 36 side face, 3
7 connecting part, 38 inside side face, 41, 42
Locking element, 43 conductor tracks, 44 contacts,
46 current rail, 47,48 pre-assembly means

Claims (8)

[Utility model registration claims] 1. An ignition device with an ignition coil for an internal combustion engine, the ignition coil being fixedly arranged in a shaft (17) of the internal combustion engine by means of a high-voltage connection (22). A plug (21) mounted on and in contact with a first connection part (27) at the end through which the spark plug is mounted at the position where it is mounted on the spark plug (21); In the type adapted to be held by a crimping part (32), a first locking element (42) is provided on the ignition coil (12) and corresponds to said first locking element. Internal combustion, characterized in that it is non-rotatably engaged positively in a second coupling part (37) with a second locking element (41) arranged in a positive manner Ignition device for engines. 2. A first locking element (42) is arranged on the circulating side (36) of the end of the ignition coil, the side (36) limiting the end (34). 2. The ignition device according to claim 1, wherein the ignition device is inclined with respect to the first direction. 3. The second locking element (41) comprises a first locking element (41).
Side surface (36) of the second connection part (37) for centering the end provided with the locking element
3. An inner side surface (38) corresponding to (2).
An igniter as described. 4. The second connecting part (37) forms an integral connection as part of the holding element (13) of the ignition device (11) with at least one spark plug (21). The ignition device according to claim 3. 5. A current rail (46) in which the holding element (13) is partially injection molded with plastic.
And the contact (44) from the current rail is connected to the conductor track (4) arranged on the end face (34) of the ignition coil (12).
5. The ignition device according to claim 4, wherein the ignition device protrudes belonging to (3). 6. The second connecting part (37) is provided with first pre-assembly means (47) in which the ignition coil (12) is inserted into the second connecting part (37). ), The second pre-assembly means (48) of the ignition coil (12)
6. The igniter according to claim 5, wherein the first and second engagement portions are engaged so as to be axially movable in the second connection portion. 7. The mutually positively engaging engagement between the locking elements (41, 42) is frictionally engaged by the high-voltage contact element (32) of the ignition coil (12) as a crimping part (32). The ignition device according to any one of claims 1 to 6, further comprising: 8. The ignition as claimed in claim 1, wherein the holding element has a number of second connecting parts corresponding to the number of cylinders of the internal combustion engine. apparatus.