JPH0435580Y2 - - Google Patents

Description

[Detailed description of the invention] A. Purpose of the invention (1) Industrial application field The present invention relates to a power distributor/ignition coil assembly used in an ignition device for an internal combustion engine.

(2) Conventional technology Conventionally, a power distributor and an ignition coil are configured separately.

(3) Problems to be solved by the invention However, with the above configuration, the distributor and ignition coil must be installed separately, which increases the number of installation steps, and the connection wire between the ignition coil and the distributor increases. There is a problem that the wiring structure becomes complicated as the length becomes longer.

In order to solve this problem, for example, as disclosed in Japanese Unexamined Patent Publication No. 58-25580, an ignition coil is built into the cylindrical housing of a power distribution device, and they are installed all at once. A method that can simplify the structure has already been proposed, but in that proposal, the coil case of the ignition coil partially protrudes from the distributor housing and is exposed, so the housing and coil case are exposed. It is necessary to strictly seal the seams between the cases, and since a relatively thick coil case is placed adjacent to the pulse generator side in the radial direction of the rotor shaft in the cylindrical housing, the cylindrical There are problems such as an increase in the diameter of the shaped housing.

The present invention has been proposed in view of the above, and aims to provide a power distributor/ignition coil assembly that can solve all of the above-mentioned conventional problems.

B. Structure of the invention (1) Means for solving the problem According to the invention, in order to achieve the above object, the inner end of the drive shaft is inserted into the cylindrical housing into which the drive shaft that rotates in conjunction with the engine is inserted. a power distribution rotor connected to the drive shaft; a rotor shaft that is fitted into the middle part of the drive shaft and interlocks with the shaft via a centrifugal advance mechanism; A pulse generator that generates a pulse signal, and an ignition coil that is adjacent to one side of the pulse generator and responds to the pulse signal are accommodated, and the pulse generator includes a signal rotor that is fixed to a rotor shaft, and a signal rotor that is fixed to a rotor shaft. iron core that cooperates with the signal rotor,
A pickup coil and a magnet are supported in an inner ring, and an outer ring is provided with a bearing fixed to the inner wall of the housing, a vacuum advance mechanism is connected to the inner ring, and the ignition coil is connected to a first coil extending in the tangential direction of the rotor axis. and an ignition coil iron core formed into a generally rectangular frame shape by the second cross member and the first and second vertical members along the axis of the rotor shaft; and a coil case that covers the coil and is disposed on one side of the signal rotor, and each of the cross members has a cross-sectional shape that is flat in the radial direction of the rotor axis and a thickness that is small in the radial direction. The coil and coil case each have an approximately rectangular cross section with a short axis substantially perpendicular to the rotor axis, corresponding to the cross-sectional shape of the first cross member. The second cross member is formed in an elliptical shape, and the second cross member is exposed from the coil case, and its outer surface is joined to the inner circumferential wall of the housing, and its inner surface is closely opposed to the outer circumferential surface of the bearing outer ring. (2) Effect Since the ignition coil is housed and fixed in the housing of the power distributor, the ignition coil can be installed at the same time by simply installing the power distributor to the internal combustion engine, and a special sealing means for the ignition coil is provided. Furthermore, since the connection between the ignition coil and the power distributor can be made within the power distributor, the wiring structure between them is simplified.

In particular, according to the above configuration of the ignition coil, the first cross member of the iron core around which the coil is wound can be formed as thin as possible in the radial direction of the rotor shaft, and the coil case placed on the signal rotor side can be formed as thin as possible in the radial direction of the rotor shaft. Since the coil case can be formed as thin as possible, the amount of radial protrusion of the portion of the cylindrical housing that covers the coil case can be effectively suppressed. In addition, the inner surface of the second cross member, which is thin like the first cross member of the iron core, is placed in opposing proximity to the outer peripheral surface of the bearing outer ring which is offset in the rotor axis direction with respect to the coil case; By joining the outer surface of the second cross member to the inner circumferential wall of the cylindrical housing, the amount of radial protrusion of the portion of the cylindrical housing that covers the second cross member can also be effectively suppressed.

Furthermore, since both vertical members and the second cross member of the ignition coil core can be exposed from the coil case and joined to the inner wall of the cylindrical housing, heat is efficiently radiated from the core to the housing side.

(3) Embodiment In FIGS. 1 and 2, the cylindrical housing 1 of the power distributor D includes an aluminum alloy housing body 2 having an opening at one end, and a sealing member 3 in the opening.
It consists of a synthetic resin cap 5 which is secured by a screw 4 so as to be openable and closable through the cap. Housing body 2
A drive shaft 6 protrudes into the housing 1 so as to be disposed in the axial direction of the housing 1, and one end of the drive shaft 6 is rotatably supported by the end wall 2c of the housing body 2 via a bearing 7. The other end facing into the housing 1 is rotatably supported by the housing body 2 via a bearing 8 and a holder 9 that holds it. 10 is a set screw of the holder 9.

A power distribution rotor 11 is fixed to the protruding end of the drive shaft 6 by a set screw 12, and an Oldham joint 13 is attached to the protruding end. Mates with the installed Oldham joint. As a result, the drive shaft 6 is driven by the engine.

A hollow rotor shaft 14 is rotatably fitted to the drive shaft 6 between both bearings 7 and 8 . One end of the rotor shaft 14 located on the bearing 7 side and the drive shaft 6 are connected via a known centrifugal advance mechanism G.

The centrifugal advance mechanism G includes a base plate 15 integrally fixed to the drive shaft 6, an ignition timing plate 16 integrally fixed to the rotor shaft 14, and a pair of weights 17 swingably supported by the base plate 15. , the support pin 18 of the weight 17 and the support pin 19 erected on the ignition timing plate 16
It consists of a pair of springs 20 stretched between them. Thereby, the rotor shaft 14 is interlocked with the drive shaft 6 via the centrifugal advance mechanism G.

A pulse generator P that generates an ignition signal is disposed above the centrifugal advance mechanism G. The pulse generator P includes a signal rotor 21 that is fixed to a rotor shaft 14 and has a protrusion 21a on the outer peripheral surface corresponding to the number of cylinders of the engine, an outer ring 22a that is fixed to a step 23 on the inner wall of the housing body 2, and an inner ring 22b. The bearing 22 surrounding the rotor shaft 14, the L-shaped support fitting 24 fixed on the inner ring 22b of the bearing 22, the magnet 25 fixed to the rising portion 24a of the fitting 24, and the magnet 25 rising integrally with the bearing 22. It consists of an iron core 26 fixed to a portion 24a and a pick-up coil 27 wound around the iron core 26.
It is adapted to be able to face each protrusion 21a of.
The inner ring 22b is also connected to a known vacuum advance mechanism V via a connecting rod 28. 64 is a retaining plate for the pick-up coil 27, 65 is a holding fitting for the outer ring 22a, and 66 is a set screw for the holding fitting 65.

A magnetic transmission plate 29 is press-fitted and fixed to the rotor shaft 14, and its outer peripheral surface is connected to the inner ring 2 surrounding the rotor shaft 14.
It is close to the inner peripheral surface of 2b. In this way, rotor shaft 1
The reason why the magnetic transmission plate 29 is interposed between the inner ring 22b and the inner ring 22b is as follows. That is, in assembly, the signal rotor 21, the ignition timing plate 16 of the centrifugal advance mechanism G, etc. are attached to the rotor shaft 14, and then the rotor shaft 14 is fitted to the drive shaft 6. It cannot be fixed to 2. Therefore, after fitting the rotor shaft 14 to the drive shaft 6, the bearing 22
is attached to the housing body 2, it is necessary to make the inner diameter of the inner ring 22b larger than the outer diameter of the signal rotor 21, and as a result, the rotor shaft 14
The distance between the inner ring 22b and the inner ring 22b becomes wider. Magnetic transmission plate 2
9 fills this wide gap and connects the rotor shaft 14 and the inner ring 2.
This is necessary to form a magnetic flux between 2b.

The power distribution rotor 11 includes a synthetic resin body 11a fitted to the drive shaft 6, and a power distribution electrode 30 embedded in the synthetic resin body 11a. One end of the power distribution electrode 30 is exposed inside the cap 5 so that it can face a side electrode 31 buried in the cap 5. A plurality of side electrodes 31 are provided according to the number of cylinders of the engine, and these are connected to a spark plug (not shown). The base end of the power distribution electrode 30 is exposed on the end surface of the synthetic resin body 11a, and the carbon center electrode 32 provided on the cap 5 is attached to the base end.
are now in sliding contact.

One side of the signal rotor 21 and the outer ring 22a,
In the illustrated example, the housing 1 is located adjacent to the side facing the pickup coil 27 of the pulse generator P.
An ignition coil accommodating space S extending between the housing body 2 and the cap 5 is provided inside, and an ignition coil 33 is fixed to the inner wall of the housing body 2 within the space S.

As shown in FIGS. 3 and 4, the ignition coil 33 is
Ignition coil iron core 3 formed in a substantially rectangular frame shape
4, and the primary and secondary coils 4 as coils concentrically wound around the coil winding core of the iron core 34.
6 and 48, and a coil case 49 that accommodates these coils 46 and 48. The iron core 34 consists of a pair of first and second layered anisotropic silicon steel plates.
Vertical members 35 ₁ , 35 ₂ and first and second cross members 36 ₁ ,
36 ₂ , and as is clear from FIGS. 1 and 2, the first and second vertical members 35 ₁ ,
35 ₂ extends along the axis of the rotor shaft 14;
The second cross members 36 ₁ , 36 ₂ are arranged to extend in the tangential direction of the rotor shaft 14 , and in particular, the cross-sectional shape of each cross member 36 ₁ , 36 ₂ is a flat rectangle in the radial direction of the rotor shaft 14 . It shows. 1st, 2nd
Vertical members 35 ₁ , 35 ₂ and first and second cross members 36 ₁ ,
36 ₂ has both end faces sloped at approximately 45°, and the dovetail 37 of each horizontal member 36 ₁ and 36 ₂ end face is sloped at an angle of approximately 45°.
5 ₁ and 35 ₂ are fitted into dovetail grooves 38 on the end faces to form a rectangular frame shape. The reason why the iron core 34 is formed into a frame shape by the four members 35 ₁ , 35 ₂ and 36 ₁ , 36 ₂ is to align the direction of easy magnetization of each member along its longitudinal direction to form a closed magnetic path. .

The length l ₂ of each horizontal member 36 ₁ , 36 ₂ is the length of each vertical member 35 ₁ , 3
The length of 5 ₂ is set longer than l ₁ (i.e. l ₂ > l ₁ ),
Also, the width w 2 of each horizontal member 36 ₁ , 36 ₂ is equal to the width w ₂ of each vertical member 35 ₁ , 36 2 .
The width is set wider than the width w ₁ of 35 ₂ (ie, w ₂ >w ₁ ). Furthermore, the thickness t ₂ of each horizontal member 36 ₁ , 36 ₂ in the radial direction of the rotor axis is set to be thinner than that t ₁ of each vertical member 35 ₁ , 35 ₂ (that is, t ₁ >t ₂ ). Moreover, vertical member 3
The cross-sectional areas of 5 ₁ , 35 ₂ and the cross members 36 ₁ , 36 ₂ are set to be the same, thereby making the magnetic resistance of the drawing materials 35 ₁ , 35 ₂ and 36 ₁ , 36 ₂ uniform.

A pair of presser plates 39 are applied from both sides to the ends of each vertical member 35 ₁ , 35 ₂ and both horizontal members 36 ₁ , 36 ₂ connected thereto.
5 ₁ , 35 ₂ and each cross member 36 ₁ , 36 ₂ by a rivet 40 passing through them. On one side of both longitudinal members 35 ₁ and 35 ₂ , shims 41 are superimposed on the presser plate 39, and each shim 41 is attached to the rivet 4.
0, it is integrally joined to the holding plate 39. Each shim 41 has the function of filling the gap between the mounting surface of the housing body 2 and the iron core 34 when the ignition coil 33 is attached to the housing body 2, as will be described later. The first horizontal member 36 ₁ , which is one side of the iron core 34, is housed in a coil case 49, which will be described later, as a coil winding core, and both vertical members 35 ₁ and 35 ₂ and the second horizontal member 36
₂ is exposed outside the coil case 49, and screw insertion holes 42 are formed at the overlapping portion of the shims 41 in both vertical members 35 ₁ and 35 ₂ and at both ends of the second horizontal member 36 ₂ , and each screw insertion hole 42 is A flanged cylinder 44 having a screw hole 43 is fitted into the hole 42 from the side opposite to the shim 41 .

The first cross member 36 ₁ has an air gap g at a bisecting position in the longitudinal direction, and a primary coil 46 is attached to the outer peripheral surface of the air gap via a synthetic resin bobbin 45, and a synthetic resin is attached to the outer periphery of the primary coil 46. A secondary coil 48 is concentrically wound through a manufactured bobbin 47. Both coils 46 and 48 have a substantially elliptical cross section with the short axis orthogonal to the axial direction of both vertical members 35 ₁ and 35 ₂ .

The first cross member 36 ₁ and both coils 46 and 48 are
The coils 46 and 48 are housed in a bottomed synthetic resin coil case 49 having a substantially oval cross section and having a similar shape to the coils 46 and 48, and are potted inside the coil case 49 so that the coils 46 and 48 are made of synthetic resin. Lump R
enclosed inside. A bulge 49a having a terminal accommodating hole 50 is provided on the outer peripheral surface of the longer diameter side of the coil case 49 protruding from between the vertical members 35 ₁ and 35 ₂ , and a high voltage terminal 51 is inserted into the bulge 49 a to accommodate the terminal. It is sealed in the synthetic resin mass R filling the hole 50. A recess 51a is formed at the inner end of the high voltage terminal 51, and a bulge 49 faces the recess 51a.
A window 52 is formed in the outer wall of a. Further, a creeping discharge prevention cylindrical portion 49b that surrounds the window 52 is protruded from the outer peripheral surface of the coil case 49.

The output side of the secondary coil 48 is connected to the outer end of the high voltage terminal 51, and the input side of the secondary coil 48 is connected to the input side of the primary coil 46. Further, in the opening of the coil case 49, a first low voltage terminal 53 ₁ connecting between the power source and the input side of the primary coil 46 is provided.
An igniter unit 54 fixed to the output side of the primary coil 46 and the outer peripheral surface of the housing body 2 (Fig. 2)
A second low-voltage terminal 53 ₂ is provided with its base end portions encapsulated in the synthetic resin mass R.

The ignition coil 33 is arranged in the coil housing space S as described below. That is, as shown in FIGS. 1 and 2, the first and second cross members 36 ₁ and 3 of the iron core 34
6 ₂ is oriented in the tangential direction of the drive shaft 6, and the outer surface of the second cross member 36 ₂ is supported on a support protrusion 55 protruding from the bottom of the housing body 2, and the high voltage terminal 5
1 above the opening of the housing body 2,
Furthermore _, as _shown in FIG _. The coil case 49 is brought close to the outer peripheral surface of the signal rotor 21 by contacting the mounting surfaces 2a and 2b, respectively, and the second cross member 36
₂ is brought close to the outer peripheral surface of the outer ring 22a.

Two screw insertion holes 56 are formed in each of the mounting surfaces 2a and 2b of the housing body 2, and a mounting screw 57 is inserted into each screw insertion hole 56.
are screwed into each screw hole 43 of the iron core 34, thereby fixing the ignition coil 33 to the housing body 2.

The head of each mounting screw 57 protruding from the outer peripheral surface of the housing body 2 is covered with a waterproof liquid sealant 58 as shown in FIGS. 5 and 6.

In this way, the three sides of the iron core 34, that is, both vertical members 35 ₁ ,
35 ₂ and the second cross member 36 ₂ are exposed outside the coil case 49 and brought into contact with the housing body 2, thereby improving the heat dissipation of the iron core 34. Further, when the ignition coil 33 is attached to the housing body ₂ by screwing the mounting screws 57 passing through the housing body 2 into the screw holes 43 of both the vertical members 35 ₁ , 35 ₂ and the second horizontal member 36 2, the ignition coil 33 There is no need to provide a support or the like on the housing body 2 for attaching the ignition coil 33, and the structure for attaching the ignition coil 33 is simplified.

Furthermore, both long horizontal members 36 ₁ , 3 in the iron core 33
6 ₂ is oriented in the tangential direction of the drive shaft 6, the axial length of the housing 1 is not increased.

Moreover, the coil case 49 is arranged so that its short diameter is substantially perpendicular to the rotor axis, so that the signal rotor 21
The second cross member 36 ₂ of the iron core 34 is close to the outer peripheral surface of the bearing 22 and below the coil case 49 .
Because it is close to the outer ring 22a of the housing body 2
Expansion in the radial direction is suppressed as much as possible.

In this way, the housing 1 is made smaller in its axial and radial directions.

As shown in FIG. 1, the center electrode 32 is held in a conductive cylinder 59 embedded in the cap 5 via a conductive spring 60, and a conductive rod 61 buried in the cap 5 is held in the conductive cylinder 59. One end is connected. A conductive tube 61a formed at the other end of the conductive rod 61
is opened in the cap 5, and a conductive element 63 having the same structure as the center electrode 32 is held in the conductive tube 61a via a conductive spring 62, thereby opening the cap 5.
When the conductive element 63 is placed over the opening of the housing body 2, the conductive element 63 is brought into contact with the recess 51a of the high voltage terminal 51 in the ignition coil 33. It is reliably maintained by being biased towards.

In this way, the high voltage terminal 51 and the center electrode 32 are connected via the conductive rod 61 embedded in the cap 5 and the conductive element 63 provided on the conductive rod 61, so that a connection path between both members 51 and 32 is established. The length of the wiring is shortened and the wiring structure is simplified. Also conductive electron 6
Since the connection between the cap 5 and the high voltage terminal 51 is a butt connection, the connection between the two members 51 and 63 is made at the same time as the cap 5 is attached to the housing body 2, making the connection work extremely easy.

Furthermore, if the center electrode 32 and the conductor 63 are made to have the same configuration, there is no need to specially manufacture the conductor 63, so that the manufacturing man-hours and costs can all be saved.

In the above configuration, when the engine is operated and the drive shaft 6 is rotated, the rotor shaft 1 is rotated through the centrifugal advance mechanism G.
4. Therefore, the signal rotor 21 rotates.
Each protrusion 21a of the signal rotor 21 corresponds to the protrusion 26 of the iron core 26 in the pulse generator P.
When facing a, the magnet 25, iron core 26, signal rotor 21, rotor shaft 14, magnetic transmission plate 2
9. A magnetic flux is formed between the inner ring 22b, the support fitting 24, and the magnet 25, and then the magnetic flux changes as the protrusion 21a and the protrusion 26a are offset, so that a pulse voltage is applied to the pick-up coil 27, and therefore An ignition signal is generated. The ignition signal sends the igniter unit 54 to the ignition coil 3.
Since the primary coil 46 of No. 3 is operated to cut off the primary current flowing through the primary coil 46, a high voltage is generated in the secondary coil 48, and this high voltage is applied to the high voltage terminal 51 and the conductor 6
3. Conductive rod 61, center electrode 32 and power distribution electrode 3
0 to the corresponding side electrode 31 to spark the ignition plug.

This ignition timing is determined by transmitting the rotation of the drive shaft 6 to the rotor shaft 14 via the centrifugal advance mechanism G and increasing the rotation speed of the signal rotor 21.
The angle is advanced by shortening the time from one opposing position to the next opposing position. Further, since the inner ring 22b of the bearing 22 is rotated by the vacuum advance mechanism V, the ignition timing is also advanced by this.

In this case, the recess 51a of the high voltage terminal 51 is surrounded by a cylindrical portion 49b;
Since the creepage distance is longer on the outer circumferential surface, creeping discharge along the outer circumference of the case 49 of the high voltage terminal 51 is prevented. Further, since the drive shaft 6 is supported by the bearings 7 and 8 in a double-sided manner, the drive shaft 6 does not run out.

C. Effects of the invention According to the invention, since the ignition coil is housed and fixed within the housing of the power distributor, the installation work of the ignition coil can be done at the same time by simply installing the power distributor to the internal combustion engine, which reduces the number of man-hours required for installation. can be significantly reduced. In addition, there is no need for a dedicated sealing means for the ignition coil, and since the entire ignition coil can be covered by the cylindrical shape of the power distributor, the sealing structure as a whole is simple. Furthermore, since the connection between the ignition coil and the power distributor can be made within the power distributor, the wiring structure between them can be simplified.

In particular, the ignition coil is formed into a substantially rectangular frame shape as a whole by first and second cross members extending in the tangential direction of the rotor shaft and first and second vertical members extending along the axis of the rotor shaft. It has an iron core, a coil that is wound only around a first cross member of the iron core, and a coil case that covers this coil and is arranged on one side of the signal rotor, and each of the cross members has a cross-sectional shape. is formed into a rectangular shape that is flat in the radial direction of the rotor shaft and whose thickness in the radial direction is thinner than that of each vertical member, and the coil and coil case are
Corresponding to the cross-sectional shape of the cross member, the cross-section is formed into a substantially oval shape with a short axis substantially perpendicular to the rotor axis;
Further, the second cross member is exposed from the coil case, and its outer surface is joined to the inner circumferential wall of the housing, and its inner surface is closely opposed to the outer circumferential surface of the bearing outer ring, so that the coil The first cross member of the core to be wound can be formed as thin as possible in the radial direction of the rotor shaft, and the coil case placed on one side of the signal rotor can be formed as thin as possible in the radial direction of the rotor shaft. The amount of radial protrusion of the portion of the shaped housing that covers the coil case can be effectively suppressed. In addition, the inner surface of the second cross member, which is thin like the first cross member of the iron core, is placed in opposing proximity to the outer peripheral surface of the bearing outer ring which is offset in the rotor axis direction with respect to the coil case;
Due to the synergistic effect of joining the outer surface of the second cross member to the inner circumferential wall of the cylindrical housing, the amount of radial overhang of the portion of the cylindrical housing that covers the second cross member can be effectively reduced. As a result, even though the ignition coil is installed on one side of the pulse generator inside the cylindrical housing of the power distributor,
Since the radial expansion of the housing can be suppressed as much as possible, this is advantageous in reducing the size of the power distributor/ignition coil assembly in the radial direction. Furthermore, since both vertical members and the second cross member of the ignition coil core can be exposed from the coil case and joined to the inner wall of the cylindrical housing, this can contribute to improving the heat dissipation of the core.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a longitudinal sectional front view of the entire assembly, FIG. 2 is a sectional view taken along the line of FIG. 1, FIG. 2A is a partial perspective view of the pulse generator, and FIG. is a side view of the main part of the ignition coil cut away, which corresponds to the view in the direction of the arrow in FIG. 2, FIG. 4 is a perspective view of the iron core, FIG. 5 is a view of the assembly in the direction of the V in FIG. FIG. 5 is a sectional view taken along the line. D...Distributor, S...Ignition coil accommodation space, 1
... Housing, 14 ... Rotor shaft, 21 ... Signal rotor, 22 ... Bearing, 25 ... Magnet, 26 ... Iron core, 27 ... Pickup coil, 33 ... Ignition coil, 34 ... Iron core, 35 ₁ ，
35 ₂ ...First and second vertical members, 36 ₁ , 36 ₂ ...First and second cross members, 46, 48...1 as a coil
Next, secondary coil, 49...coil case.

Claims (1)

[Scope of utility model registration request] In a cylindrical housing 1 into which a drive shaft 6 that rotates in conjunction with the engine is fitted, there is a power distribution rotor 11 connected to the inner end of the drive shaft 6, and a power distribution rotor 11 which is fitted into the middle part of the drive shaft 6 and is inserted into the cylindrical housing 1. 6, a rotor shaft 14 interlocked via a centrifugal advance mechanism G, a pulse generator P that surrounds this rotor shaft 14 and generates a pulse signal in accordance with the rotation of the rotor shaft 14, and this pulse generator P. An ignition coil 33 that is adjacent to one side and responds to the pulse signal is accommodated, and the pulse generator P includes a signal rotor 21 fixed to the rotor shaft 14, an iron core 26 that cooperates with the signal rotor 21, The pick-up coil 27 and the magnet 25 are supported on the inner ring 22b, and the outer ring 2
2a is a bearing 2 fixed to the inner wall of the housing 1;
2, and the inner ring 22b has a vacuum advance mechanism V.
are connected to each other, and the ignition coil 33 is connected to the rotor shaft 1.
the first and second cross members 36 ₁ extending in the tangential direction of 4;
36 ₂ and the first and second vertical members 35 ₁ , 35 ₂ along the axis of the rotor shaft 14 , and an ignition coil core 34 formed into a generally rectangular frame shape as a whole; Coils 46, 48 wound only on 1 horizontal member 36 ₁ , and these coils 46, 4
8 and a coil case 49 disposed on one side of the signal rotor 21, and each of the horizontal members 36
₁ and 36 ₂ have a cross-sectional shape that is flat in the radial direction of the rotor shaft 14 and a thickness t ₂ in the radial direction of each vertical member 3.
The coils 46, 48 and the coil case 49 are formed into a rectangular shape thinner than that of 5 ₁ , 35 _{2 t 1 .}
corresponds to the cross-sectional shape of the first cross member 36 ₁ ,
The second cross member 36 2 is formed into a substantially oval shape in cross section with its minor axis substantially perpendicular to the rotor shaft 14 , and the second cross member 36 ₂ is exposed from the coil case 49 , and its outer surface meets the inner circumferential wall of the housing 1 . A power distributor/ignition coil assembly, characterized in that the inner surface thereof closely opposes the outer peripheral surface of the bearing outer ring 22a.