JPH0450461Y2 - - 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 The ignition coil and ignition coil of a conventional power distribution device are configured separately.

(3) Problems to be solved by the invention However, with the above configuration, the installation work of the distributor and ignition coil must be done separately, which increases the number of installation steps, and Problems arise when the connection lines become long and the wiring structure becomes complicated.

The present invention was proposed in view of the above, and it is possible to solve all the above-mentioned conventional problems by incorporating the ignition coil in the cylindrical housing of the power distributor, and in addition, it is possible to solve all of the above-mentioned conventional problems by incorporating the ignition coil in the cylindrical housing of the power distributor. It is an object of the present invention to provide a power distributor/ignition coil assembly that can minimize the increase in dimensions of a drive shaft in the axial and radial directions.

B. Structure of the invention (1) Means for solving the problem In order to achieve the above object, the invention provides a housing body in which a drive shaft that rotates in conjunction with the engine is fitted into a closed end and whose other end is open. and a cap removably attached to the open end of the housing body, a power distribution rotor connected to the inner end of the drive shaft, and a power distribution rotor surrounding the middle portion of the drive shaft. A pulse generator that generates a pulse signal in response to rotation of the drive shaft, and an ignition coil that is adjacent to one side of the pulse generator and that responds to the pulse signal are housed, and the pulse generator is configured to generate a pulse signal according to the rotation of the drive shaft. The ignition coil includes a signal rotor provided on a shaft, and a ring-shaped support member that supports an iron core, a pick-up coil, and a magnet that cooperate with the signal rotor, and has an outer peripheral portion fixed to the inner wall of the housing. The first cross member on the open end side of the housing body and the second cross member on the closed end side of the housing body each extend in the tangential direction of the drive shaft, and the first and second vertical members extend along the axis of the drive shaft. an ignition coil core formed in a rectangular frame shape and removably supported on a mounting surface provided on the inner surface of one side wall of the housing body; and a coil wound only around a first cross member of the ignition coil core. and a coil case that covers the coil and is arranged on one side of the signal rotor, each of the vertical members is formed shorter than each of the horizontal members, and the supporting member has a part of its outer circumferential surface that is arranged on one side of the signal rotor. arranged so as to face closely the inner surface of the second cross member,
A portion of the outer surface of the one side wall corresponding to the mounting surface is formed as a slope sloping outward toward the open end of the housing body, and the mounting surface overlaps the outer surface of the second cross member. It is composed of a first mounting surface and a second mounting surface that is adjacent to the first mounting surface via a step facing toward the open end side and overlaps the outer surfaces of both the vertical members, and corresponds to the step. The thickness of each of the vertical members is set to be larger than that of the second horizontal member.

(2) Function 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 there is no need for a special sealing means for the ignition coil. 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 structure of the ignition coil, it is possible to wind the required amount of the coil around the first horizontal member that extends relatively long in the tangential direction of the drive shaft, and the first and second longitudinal members that extend in the axial direction of the drive shaft. The overall length of the ignition coil in the axial direction of the drive shaft can be kept as short as possible by forming the ignition coil to be relatively short. Coupled with the fact that the support member can be accommodated within the width of the ignition coil in the axial direction of the drive shaft, an increase in the dimension of the cylindrical housing in the axial direction of the drive shaft due to the built-in ignition coil can be suppressed as much as possible. In addition, since the supporting member is arranged offset in the axial direction of the drive shaft with respect to the coil case of the ignition coil, which is relatively thick in the radial direction of the drive shaft, the outer circumferential surface of the supporting member is placed within the second cross member. Coupled with the proximity of the ignition coil to the side surface, the entire ignition coil can be brought close to the drive shaft, and as a result, an increase in dimension of the cylindrical housing in the radial direction of the drive shaft can be suppressed as much as possible.

Furthermore, according to the structure in which the iron core for the ignition coil is removably supported on a mounting surface provided on the inner surface of one side wall of the housing body, the ignition coil can be attached to the housing with the cap open and the open end of the housing body exposed to the outside. It can be attached to and detached from the main body at any time. Furthermore, since the ignition coil, which is relatively heavy, is supported by the housing body rather than by the cap, its support is stable.

Furthermore, the portion of the outer surface of one side wall of the housing body that corresponds to the mounting surface is formed into a slope that slopes outward toward the open end of the housing body. Even if it is set relatively large to improve the ease of mold removal, by making the mounting surface a stepped surface as shown above,
Changes in the wall thickness of the portion of the one side wall corresponding to the mounting surface can be suppressed as much as possible. Also, especially the first part of the mounting surface.
Since the outer surface of the second horizontal member can be brought into close contact with the mounting surface, and the outer surfaces of both vertical members can be brought into close contact with the second mounting surface, the heat generated by the ignition coil can be efficiently conducted to the housing body through these contact points. be done.

(3) Embodiment An embodiment of the present invention will be explained below with reference to the drawings. First, in Figures 1 and 2, the power distributor D
The housing 1 consists of an aluminum alloy housing body 2 having a cylindrical shape with an opening at one end, and a synthetic resin cap 5 fixed to the opening via a sealing member 3 with a screw 4 so as to be openable and closable. . A drive shaft 6 protrudes into the housing body 2, 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, and the other end facing into the housing 1 The section is rotatably supported by the housing body 2 via a bearing 8 and a holder 9 that holds it. 10 is holder 9
This is a set screw.

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.

A pulse generator P is provided around the rotor shaft 14.
will be placed. The pulse generator P is fixed to a rotor shaft 14, and has a signal rotor 21 having protrusions 21a on the outer peripheral surface corresponding to the number of cylinders of the engine.
and a bearing 22 as a ring-shaped support member having an outer ring 22a fixed to the stepped portion 23 of the housing body 2;
An L-shaped support fitting 24 fixed on the inner ring 22b of the bearing 22, a magnet 25 fixed to the rising portion 24a of the fitting 24, and an iron core 26 fixed to the rising portion 24a integrally with the magnet 25.
Pickup coil 2 wound around the iron core 26
7, and the protruding portion 26a of the iron core 26 protruding from the pick-up coil 27 can face each protrusion 21a of the signal rotor 21. 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, and 65 is the outer ring 22.
The presser metal fitting 66 in a is a set screw for the presser metal 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, so the inner diameter of the inner ring 22b needs to be larger than the outer diameter of the signal rotor 21. As a result, the rotor shaft 14
The distance between the inner ring 22b and the inner ring 22b becomes wider. The magnetic transmission plate 29 is necessary to fill this wide gap and form a magnetic flux between the rotor shaft 14 and the inner ring 22b.

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.
is now sliding.

Adjacent to one side of the drive shaft 6, an ignition coil accommodating space S extending between the housing body 2 and the cap 5 is provided in the housing 1, and an ignition coil 33 is fixed to the inner wall of the housing body 2 within the space S. be done.

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 wound concentrically around the coil winding core of the iron core 34.
6 and 48, and a coil case 49 that accommodates the 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 is made into a rectangular shape by making both end faces slope at approximately 45° and fitting the dovetails 37 on the end faces of each of the horizontal members 36 ₁ and 36 ₂ into the dovetail grooves 38 on the end faces of each of the vertical members 35 ₁ and 35 ₂ . Formed into a 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 ₂ of each horizontal member 36 ₁ , 36 ₂ is the length 2 of each vertical member 35 ₁ ,
35 ₂ is set longer than the length ₁ (i.e. ₂ > ₁ ), and the width w ₂ of each horizontal member 36 ₁ and 36 ₂ is set to be longer than the length 1 of each vertical member 3
The width is set wider than the width w ₁ of 5 ₁ and 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, the cross-sectional areas of the vertical members 35 ₁ , 35 ₂ and the horizontal members 36 ₁ , 36 ₂ are set to be the same, so that both members 35 ₁ , 35 ₂
Furthermore, the magnetic resistance at 36 ₁ and 36 ₂ is made 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 presser 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 the case 49 as a coil winding core, and both vertical members 3
5 ₁ , 35 ₂ and the second cross member 36 ₂ are exposed outside the case 49, and there are screws at the overlapping part of the shim 41 in both the vertical members 35 ₁ , 35 ₂ and at both ends of the second cross member 36 ₂ . Insertion holes 42 are formed, and a flanged cylinder 44 having a screw hole 43 is fitted into each screw insertion 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 oval cross section with the major axis located in the width direction of the first cross member 36 ₁ .

The first cross member 36 ₁ and both coils 46 and 48 are
The coils 46 and 48 are housed in a bottomed case 49 made of synthetic resin having the same cross-sectional shape as that of the main body, and both coils 46 and 48 are sealed in the synthetic resin mass R by potting the coils 46 and 48 inside the case 49. Both longitudinal members 35 ₁ ,
A bulge portion 49a having a terminal accommodating hole 50 is provided on the outer peripheral surface of the longer diameter side of the case 49 protruding from between 35 and ₂ , and a high voltage terminal 51 is inserted into the bulge portion 49a to fill the terminal accommodating hole 50. It is enclosed in the lump R. A recess 51a is formed at the inner end of the high voltage terminal 51a, and a window 52 is formed in the outer wall of the bulge 49a so as to face the recess 51a. Further, a creeping discharge prevention cylindrical portion 49b that surrounds the window 52 projects from the outer peripheral surface of the 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. Also case 4
9, a first low voltage terminal ₅₃₁ for connecting the power supply and the input side of the primary coil 46, and an igniter unit 54 fixed to the output side of the primary coil 46 and the outer peripheral surface of the housing body 2. A second low-voltage terminal 53 ₂ (FIG. 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
The cross member 36 ₁ is oriented in the tangential direction of the drive shaft 6 , 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 51 is mounted on the housing body 2 . Further, as shown in FIG. 6, the outer surface of the second cross member 362 of the iron core 34 is attached to the first mounting surface _2b of the inner surface of one side wall W of the housing main body 2 via the holding plate 39. The outer surfaces of both vertical members 35 ₁ and 35 ₂ of the iron core 34 are attached to the second mounting surface 2a on the inner surface of the side wall W via the holding plate 39 and the shim 41.
The heat generated by the iron core 34 can be efficiently released to the housing body 2 side by the close polymerization to the mounting surfaces 2a and 2b.

As is clear from FIG. 6, the first and second
A housing body 2 is located between the mounting surfaces 2b and 2a.
A step st facing toward the open end side is formed. On the other hand, a portion of the outer surface of the one side wall W corresponding to both mounting surfaces 2b and 2a is formed into a slope 2f that slopes outward toward the open end of the housing body 2, so that when molding the housing body, Even if the slope of the slope is set relatively large in order to improve the die cutting performance,
Changes in the wall thickness of the portion of the one side wall corresponding to the mounting surface can be suppressed as much as possible.

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, whereby the ignition coil 33 is detachably fixed 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 case 49 and brought into contact with the housing body 2,
The heat dissipation of the iron core 34 is improved. Also, the screw holes 43 of both vertical members 35 ₁ , 35 ₂ and the second horizontal member 36 ₂
If the ignition coil 33 is attached to the housing body 2 by screwing the mounting screw 57 that passes through the housing body 2, there is no need to provide a support or the like on the housing body 2 for attaching the ignition coil 33, and the ignition coil 33 The mounting structure 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.

Furthermore, the first horizontal member 36 of the iron core 33 has a wide width.
_Both coils 46 and 48 are wound around the housing body 2 and have an oval shape that is long in the axial direction of the housing body 2 and short in the radial direction of the housing body 2. The second cross member 3 of the iron core 34 is placed close to the outer peripheral surface of the rotor 21 and further below the case 49.
6 ₂ is brought close to the outer ring 22a of the bearing 22, so
Expansion of the housing body 2 in the radial direction is suppressed as much as possible.

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

Further, when inspecting or replacing the ignition coil 33, the ignition coil 33 can be easily removed from the housing body 2 by loosening each mounting screw 57 and removing it from the iron core 34.

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 removed from the housing body 2, making the connection work extremely easy.

Furthermore, if the center electrode 32 and the conductive electron 63 have the same configuration, there is no need to specially manufacture the conductive electron 63, so that the manufacturing man-hours and costs can be completely eliminated.

Next, the operation of this embodiment will be explained. When the engine is operated and the drive shaft 6 is rotated, the rotor shaft 14, and therefore the signal rotor 21, are rotated via the centrifugal advance mechanism G. and signal rotor 21
When each protrusion 21a faces the protrusion 26a of the iron core 26 in the pulse generator P, the magnet 25, the iron core 26, the signal rotor 21, the rotor shaft 14, the magnetic transmission plate 29, the inner ring 22b, the support metal fitting 2
A magnetic flux is formed between 4 and magnet 25,
Next, the magnetic flux changes as the protrusion 21a and the protrusion 26a differ, so that a pulse-like voltage is generated in the pickup coil 27. That voltage connects the igniter unit 54 to one of the ignition coils 33.
Since the secondary coil 46 is operated to cut off the primary current flowing through the secondary coil 46, a high voltage is generated in the secondary coil 48, and the high voltage is transmitted to the high voltage terminal 51, the conductor 63, the voltage rod 61, the center electrode 32, and the power distribution electrode. 30 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 peripheral surface, creeping discharge along the outer peripheral surface 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 As described above, according to the invention, since the ignition coil is housed and fixed within the housing of the power distributor, the work of installing the ignition coil can be done at the same time by simply installing the power distributor to the internal combustion engine. The man-hours required to install them 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 includes a first cross member on the open end side of the housing body and a second cross member on the closed end side of the housing body, each extending in the tangential direction of the drive shaft, and first and second longitudinal members along the axis of the drive shaft. an ignition coil iron core that is formed as a whole into a generally rectangular frame shape, a coil that is wound only around a first cross member of this iron core, and a coil that covers this coil and is placed on one side of the signal rotor. a case, the square vertical member is formed shorter than each horizontal member, and a part of the outer circumferential surface of the ring-shaped support member of the pulse generator is
Since it is arranged so as to closely face the inner circumferential surface of the cross member, it is possible to wind the required amount of coils around the first cross member that extends relatively long in the tangential direction of the drive shaft, and
By forming the first and second vertical members extending in the axial direction of the drive shaft to be relatively short, the total length of the ignition coil in the axial direction of the drive shaft can be kept as short as possible. By facing the inner circumferential surface of the second horizontal member, the support member can be accommodated within the width of the ignition coil in the axial direction of the drive shaft. Since the increase in dimension in the axial direction can be suppressed as much as possible, the ignition coil can be easily accommodated in the cylindrical housing, which tends to increase in dimension in the same direction due to the built-in pulse generator.

Furthermore, as described above, according to the arrangement in which the outer circumferential surface of the ring-shaped support member of the pulse generator faces the inner circumferential surface of the second cross member, the coil case, which is relatively thick in the radial direction of the drive shaft of the ignition coil, On the other hand, since the support member can be offset in the axial direction of the drive shaft, the outer peripheral surface of the support member is brought close to the inner surface of the second cross member, and the entire ignition coil can be brought closer to the drive shaft. Therefore, it is possible to minimize the increase in dimension of the cylindrical housing in the radial direction of the drive shaft due to the built-in ignition coil.

Furthermore, since the iron core for the ignition coil is removably supported on the mounting surface provided on the inner surface of one side wall of the housing body, the ignition coil can be attached to the housing body with the cap open and the open end of the housing body exposed to the outside. It can be attached and detached at any time, making maintenance easy. Furthermore, since the relatively heavy ignition coil is supported by the housing body rather than by the cap, its support is stable and the load on the cap mounting portion of the housing body can be reduced.

Furthermore, a portion of the outer surface of one side wall of the housing body corresponding to the mounting surface is formed as a slope inclined outward toward the open end of the housing body, and the mounting surface is formed on the outer surface of the second cross member. and a second mounting surface that is adjacent to the first mounting surface via a step facing toward the open end and that overlaps the outer surfaces of both longitudinal members, and a second mounting surface that overlaps the outer surfaces of both vertical members. Correspondingly, since the thickness of each vertical member is set larger than that of the second cross member, even if the slope of the slope is set relatively large in order to improve the ease of demolding during molding of the housing body, the thickness of each vertical member is set larger than that of the second cross member. While suppressing changes in the wall thickness of the portion of the side wall corresponding to the mounting surface as much as possible, the outer surface of the second horizontal member can be brought into close contact with the first mounting surface, and the outer surfaces of both vertical members can be brought into close contact with the second mounting surface, respectively. The heat generated by the ignition coil can be efficiently released to the housing body through the close contact portion, which is effective in preventing the ignition coil from overheating.

[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. This is a side view with the main parts of the ignition coil cut away, and 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 arrow in FIG. It is a figure-line sectional view. D...Distributor, P...Pulse generator, st
...Step, t ₁ , t ₂ ... Thickness, w ... One side wall, 1...
...Housing, 2...Housing body, 2a...
Second mounting surface, 2b...First mounting surface, 2f...Slope, 5...Cap, 6...Drive shaft, 11...Power distribution rotor, 21...Signal rotor, bearing as a ring-shaped support member, 25 ...Magnet, 26
...Iron core, 27...Pickup coil, 33...
...Ignition coil, 34...Ignition coil iron core, 35
₁ , 35 ₂ ... first and second vertical members, 36 ₁ , 36 ₂ ...
First and second cross members, 46, 48...coils.

Claims (1)

[Scope of utility model registration request] A cylindrical housing body 2 having a closed end into which a drive shaft 6 that rotates in conjunction with the engine is fitted and an open end, and a cap 5 removably attached to the open end of the housing body 2. Inside the housing 1, there are provided a power distribution rotor 11 connected to the inner end of the drive shaft 6, and a pulse generator P that surrounds the middle part of the drive shaft 6 and generates a pulse signal in accordance with the rotation of the drive shaft 6. and an ignition coil cycle 33 that is adjacent to one side of the pulse generator P and responds to the pulse signal. The ignition coil 33 is provided with a ring-shaped support member 22 that supports an iron core 26, a pickup coil 27, and a magnet 25 that cooperate with the rotor 21, and whose outer peripheral portion is fixed to the inner wall of the housing 1. The first cross member 36 ₁ on the open end side of the housing body 2 and the second cross member 36 ₂ on the closed end side of the housing body 2 extend in the tangential direction, and the first and second vertical members 35 extend along the axis of the drive shaft 6. ₁ , 35 ₂ , the ignition coil iron core 34 is formed into a substantially rectangular frame shape as a whole and is removably supported on mounting surfaces 2a and 2b provided on the inner surface of one side wall W of the housing main body 2, and the ignition coil core 34 Coils 46 and 48 wound only on the first cross member 36 ₁ of the coil core 34 and this coil 4
6 and 48 and a coil case 49 disposed on one side of the signal rotor 21, each of the vertical members 35 ₁ and 35 ₂ is formed shorter than each of the horizontal members 36 ₁ and 36 ₂ , and the support The member 22 is arranged so that a part of its outer peripheral surface closely faces the inner surface of the second cross member 36 ₂ , and a portion of the outer surface of the one side wall W that corresponds to the mounting surfaces 2a and 2b is The mounting surface is formed as a slope 2f that slopes outward toward the open end of the housing body 2, and the mounting surface is connected to the second cross member 3.
A first mounting surface 2b overlapping the outer surfaces of 6 ₂ and adjacent to the first mounting surface 2b via a step st facing the open end side and both vertical members 35 ₁ , 3
₅ and a second mounting surface 2a that overlaps the outer surface of each vertical member 3, corresponding to the step ST.
The thickness t ₁ of 5 ₁ and 35 ₂ is that of the second cross member 36 ₂ t ₂
A power distributor/ignition coil assembly characterized by being set larger than the above.