JPH0814148A - Power distribution device of spark ignition type engine - Google Patents

Abstract

PURPOSE:To prevent an ignition timing from being changed by engine users and the like by preventing a tap bolt from being loosened so as to rotationally move a case by the users of the engine and the like. CONSTITUTION:This power distribution device is constituted so that the ignition timing can be adjusted based on the rotationally moved posture of the case of a distributor, and the case can be fixedly secured on a prescribed rotationally moved posture by means of a tap bolt 8. In this power distribution device of a spark ignition type engine, the following are set. That is to say, a bolt with a square hole is used for the tap bolt 8, a sealed tool 12 constituted by fixedly securing a metallic cylindrical pipe 16 to a metallic washer 15 formed by bending a whirl-stop engaging piece 14 is mounted on the head part 9 of the bolt, and a plug 17 is press-fitted in the square hole 11 for engaging with a tool.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spark ignition type engine power distribution device, and more particularly to a device capable of preventing a change in ignition timing by a user of the engine.

[0002]

2. Description of the Related Art FIG. 4 shows a conventional technology of a power distribution device for a spark ignition type engine. This is similar to the present invention
It has the following basic structure. That is, the case 103 of the distributor 102 is attached to the machine wall 101 of the engine body.
Is rotatably attached, and the ignition timing can be adjusted based on the rotating posture of the case 103. The flange portion 105 is led out from the peripheral side wall 104 of the case 103, and the case 103 is attached to the flange portion 105. A circular arc-shaped long hole 107 centering on the rotation center axis line 106 is opened, and a holding bolt 108 inserted through the circular-arc long hole 107 is screwed into the machine wall 101 of the engine body.
The flange portion 105 is sandwiched between the 08 bolt head 109 and the machine wall 101 of the engine body so that the case 103 can be fixed in a predetermined rotational posture.

In the spark ignition engine power distribution device having such a basic structure, the ignition timing can be adjusted by loosening the holding bolt 108 and rotating the case 103. By the way, in the above-mentioned conventional technique, the bolt head 109 of the holding bolt 108 is exposed.

[0004]

The above-mentioned conventional techniques have the following problems. Since the bolt head 109 of the holding bolt 108 is exposed, the holding bolt 108 can be freely loosened. Therefore, even if the engine manufacturer sets the ignition timing that complies with exhaust gas regulations and the like, and the engine is shipped, the engine user loosens the holding bolt 108 for the purpose of increasing the output, The case 103 may be rotated to change the ignition timing, and the engine may be modified to one that does not comply with exhaust gas regulations and the like.

In order to solve the above problems, the inventor of the present invention made the following prototype prior to the present invention. That is, as shown in FIG. 5, a sealing tool 112, which is formed into a cylindrical cap shape by deep drawing of a sheet metal, is provided with a prismatic bolt head 1.
09, and the closure 112 is fixed to the bolt head 109 with a rivet 139. When the engine is shipped in this state, the engine user or the like cannot engage a tool such as a wrench with the outer peripheral side surface 113 of the bolt head 109 serving as a tool engaging portion, and cannot loosen the holding bolt 108. I thought. However, it was found that even in the case of this prototype, the following problem ~ occurs.

Since the peripheral side portion 140 of the closure 112 is as small as the diameter of the bolt head 109, it cannot be made thick enough in deep drawing and its strength against deformation is sufficiently large. Can not. Therefore, when the peripheral side portion 140 of the sealing tool 112 is strongly grasped from both sides by a tool such as pliers, the peripheral side portion 140 is deformed relatively easily and closely adheres to the outer peripheral side surface 113 of the prismatic bolt head 109. However, the bolt head 109 is locked to the tool via the peripheral side portion 140 of the deformed closure 112, and the pressing bolt 108 may be loosened by this tool, and the ignition timing is changed by the engine user or the like. Cannot be reliably prevented.

Although the closure 112 is only fixed to the bolt head 109 by the rivet 139, the rivet 139 is relatively easy to break, so that the closure 112 can be pulled out from the bolt head 109. There is a possibility that the ignition timing cannot be reliably changed in this respect as well.

The production of the closure 112 requires deep drawing, which increases the production cost. An object of the present invention is to provide a spark ignition type engine power distribution device that can reliably prevent the ignition timing from being changed by the engine user or the like.

[0009]

According to the present invention, as illustrated in FIG. 3, a case 3 of a distributor 2 is rotatably attached to a machine wall 1 of an engine main body, and the case 3 is based on the rotational posture of the case 3. Configured so that the ignition timing can be adjusted,
A flange portion 5 is led out from the peripheral side wall 4 of the case 3, and an arcuate elongated hole 7 having a rotation center axis line 6 of the case 3 as a center is formed in the flange portion 5 and inserted into the arcuate elongated hole 7. The holding bolt 8 is screwed into the machine wall 1 of the engine body, and the flange portion 5 is sandwiched between the bolt head 9 of the holding bolt 8 and the machine wall 1 of the engine body to fix the case 3 to a predetermined position. A spark ignition engine power distribution device configured so that it can be fixed in a rotational posture is characterized as follows.

That is, as shown in FIG. 1 or FIG. 2, a square hole bolt having a tool engaging square hole 11 recessed in the top surface 10 of a cylindrical bolt head 9 is used as the holding bolt 8. , A metal washer 15 in which a detent engagement piece 14 is bent and a metal cylindrical pipe 16 is fixedly attached to the bolt head 9, and the presser bolt 8 is inserted into the washer 15. Then, a washer 15 is sandwiched between the bolt head 9 and the flange portion 5 to fix the sealing tool 12, and the cylindrical pipe 16 is closely attached to the outer peripheral side surface 13 of the cylindrical bolt head 9 to prevent the rotation stopper. It is characterized in that the joint piece 14 is inserted into the arcuate elongated hole 7 to prevent the sealing tool 12 from rotating with respect to the flange portion 5, and the plug 17 is press-fitted into the tool engaging square hole 11.

[0011]

The engine manufacturer performs the following processing when the engine is shipped. That is, as illustrated in FIG. 1, the sealing tool 12 is attached to the bolt head 9 of the holding bolt 8, the detent engagement piece 14 is inserted into the arc-shaped long hole 7, and the holding bolt 8 is loosened to the case. After rotating 3 to adjust the ignition timing, a tool such as a wrench is engaged with the tool engaging square hole 11 of the holding bolt 8 to tighten the holding bolt 8,
After the tightening is completed, the plug 17 is pressed into the tool engaging square hole 11. When this process is performed, the washer 15 is sandwiched between the bolt head portion 9 and the flange portion 5, the sealing tool 12 is firmly fixed, and the cylindrical pipe 16 is closely attached to the outer peripheral side surface 13 of the bolt head portion 9. The detent engagement piece 14 is locked to the peripheral edge portion 20 of the arcuate elongated hole 7 so that the sealing tool 12 is detented from the flange portion 5. The tool engaging square hole 11 is closed by a plug 17.

[0012]

The present invention has the following effects (FIG. 1).
reference). Since the tool engaging square hole 11 is closed by the plug 17, a tool such as a wrench cannot be inserted into the tool engaging square hole 11, and the holding bolt 8 cannot be loosened.
Therefore, it is possible to prevent the engine user from changing the ignition timing.

The cylindrical pipe 16 is in close contact with the outer peripheral side surface 13 of the cylindrical bolt head 9 and is prevented from rotating with respect to the flange portion 5. Therefore, even if the cylindrical pipe 16 is strongly gripped with a tool such as pliers, the cylindrical pipe 16 is prevented. Even if the pressing bolt 8 is rotated together with the cylindrical pipe 16 in this state, the tool slips and the pressing bolt 8 cannot be loosened. Therefore, it is possible to more reliably prevent the ignition timing from being changed.

Since the washer 15 is sandwiched between the bolt head 9 and the flange portion 5 and the cylindrical pipe 16 is fixed to the washer 5, the cylindrical pipe 16 can be pulled out from the bolt head 9 by a cylinder. It is necessary to pull it off from the washer 12 to which the pipe 16 is attached, and it is difficult to extract the cylindrical pipe 16. Further, since the plug 17 is press-fitted into the tool engaging square hole 11, it is also difficult to remove the plug 17. Therefore, also in this respect, it is possible to more reliably prevent the ignition timing from being changed.

Since the metal sealing pipe 15 is fixed to the metal washer 15 formed by bending the anti-rotation engaging piece 14 to form the closure 12, the deep closure is required for manufacturing the closure 12. Instead, it can be manufactured by simple metal working such as shearing, bending, and extrusion. Therefore, the manufacturing cost of the closure 12 can be reduced.

[0016]

An embodiment of the present invention will be described with reference to the drawings.
1 to 3 are views for explaining a power distribution device of a spark ignition type engine according to an embodiment.

The structure of the power distribution device of this engine is as follows. That is, as shown in FIG. 3, the distributor 2 is attached to the machine wall 1 of the engine body.
The distributor 2 includes a bowl-shaped case 3 in which a breaker 41 and a cam shaft 42 are housed. The breaker 41 is supported by a support plate 43 fixed to the case 3. A cap 44 is fitted to the case 3, and the cap 44 has an elastic locking piece 45.
Is detachably fixed to the case 3.

A breaker 41 is fixed to the case 3 and a cam shaft 42 is rotatably supported. As shown in FIG. 3B, the breaker 41 is composed of a breaker plate 46 and a breaker arm 47, and the cam heel 48 of the breaker arm 47 is the cam portion 4 of the cam shaft 42.
9 and contact the contact 5 of the breaker 41 with this cam portion 49.
It is configured to open and close 0. In FIG. 3A, reference numeral 51 is a rotor, 52 is a central electrode, and 53 is a lateral electrode.

A shaft insertion boss 55 is provided on the bottom wall 54 of the case 3, and the shaft insertion boss 55 is rotatably inserted into a boss insertion hole 56 formed in the machine wall 1 of the engine body. . The input end 57 of the cam shaft 42 led out from the shaft insertion boss 55 is connected to the output end 59 of the output shaft 58 on the engine body side.

According to such a structure, when the case 3 is rotated, the position of the breaker 41 supported by the case 3 is changed with the rotation of the case 3, but the output shaft on the engine body side is changed. The cam portion 49 of the cam shaft 42 connected to 58
The posture of the breaker 4 by the cam portion 49 does not change.
The lift timing of No. 1 is changed and the ignition timing is adjusted.

In addition, as shown in FIG.
A flange portion 5 is led out from the peripheral side wall 4 of this case, and an arcuate elongated hole 7 having a rotation center axis line 6 of the case 3 as a center is formed in the flange portion 5. Then, as shown in FIG. 3 (A), a holding bolt 8 inserted through the arc-shaped elongated hole 7 is screwed into the machine wall 1 of the engine body, and the bolt head 9 of the holding bolt 8 and the machine body of the engine body. The flange portion 5 is sandwiched between the wall 1 and the case 3 so that the case 3 is fixed in a predetermined rotational posture.

In this embodiment, in order to prevent the engine user from changing the ignition timing, the following structure is adopted. That is, FIG. 1 or FIG.
As shown in FIG. 2, a square bolt with a rectangular hole 11 for tool engagement provided in a top surface 10 of a cylindrical bolt head 9 is used as the holding bolt 8, and the bolt head 9 is made of a metal sealing tool. 12 is installed.

The sealing tool 12 includes a metal washer 15 formed by bending a detent engagement piece 14 and a cylindrical metal pipe 1 made of metal.
6 is fixed, the holding bolt 8 is inserted through the washer 15, and the washer 15 is provided between the bolt head 9 and the flange portion 5.
And the sealing tool 12 is fixed. Then, the cylindrical pipe 16 is brought into close contact with the outer peripheral side surface 13 of the columnar bolt head 9, the detent engagement piece 14 is inserted into the arc-shaped elongated hole 7, and the closure 12 is detented with respect to the flange part 5. ing. A plug 17 is press-fitted into the tool engaging square hole 11.

According to this structure, it is impossible to insert a tool such as a wrench into the tool engaging square hole 11,
It is possible to prevent the engine user from changing the ignition timing.
Further, even if the cylindrical pipe 16 is strongly gripped with a tool such as pliers, the cylindrical pipe 16 is not deformed, and even if the pressing bolt 8 is rotated together with the cylindrical pipe 16 in this state, the tool slips and the pressing bolt 8 can be loosened. It is not possible to change the ignition timing more reliably.

Further, in order to pull out the cylindrical pipe 16 from the bolt head 9, it is necessary to peel the cylindrical pipe 16 from the washer 15, and it is difficult to pull out the cylindrical pipe 16 and the press-fitted plug 17 is pulled out. Since it is also difficult, the change of the ignition timing can be prevented more reliably also in this respect. Further, the manufacturing of the closure 12 does not require deep drawing, and can be manufactured by simple metal working such as shearing, bending, and extruding, so that the manufacturing cost of the closure 12 can be reduced.

The specific construction of the main parts of this embodiment is as follows. That is, the washer 15 is made of sheet metal, and the cylindrical pipe 16 is fixed to the washer 15 by welding. The cylindrical pipe 16 has the same height as the bolt head 9. The tool engaging square hole 11 is formed in a hexagonal column shape. Plug 1
7 is formed in a cylindrical shape, and a left-handed screw hole 18 is formed in the center thereof. Only a left-handed special tool can be screwed into this screw hole 18, and a user who does not have this special tool cannot pull out the plug 17 from the tool engaging square hole 11, but has this special tool. A manufacturer or a maintenance company outsourced to the manufacturer can screw this special tool into the screw hole 18 to remove the plug 17, and readjust the ignition timing.

Although the contents of the embodiment of the present invention are as described above, the present invention is not limited to the above embodiment. For example, the tool engaging square hole 11 is not a hexagonal prism but a triangular prism,
It may be a polygonal column different from a hexagonal column-shaped tool engagement hole that is usually used, such as a square column, a pentagonal column, and a heptagonal column. In this case, even if the user can pull out the plug 17, In order to loosen the holding bolt 8, a special tool that can be engaged with this specially shaped tool engaging square hole 11 is required,
It is possible to more reliably prevent the ignition timing from being changed.

[Brief description of drawings]

FIG. 1 is a diagram illustrating a main part of a power distribution device according to an embodiment,
1A is a plan view, and FIG. 1B is BB of FIG. 1A.
FIG. 1C is a sectional view taken along the line CC of FIG. 1A.

FIG. 2 is an exploded perspective view of a main part of the power distribution device according to the embodiment.

FIG. 3 is a diagram illustrating an entire power distribution device according to an embodiment,
3A is a vertical side view, and FIG. 3B is B in FIG. 3A.
It is a -B line sectional view.

4A and 4B are views for explaining the entire power distribution device according to the related art, where FIG. 4A is a vertical side view and FIG. 4B is FIG. 4A.
FIG. 6 is a sectional view taken along line BB of FIG.

5A and 5B are diagrams illustrating a main part of a power distribution device according to a preceding prototype, FIG. 5A is a plan view, and FIG. 5B is B in FIG. 5A.
-B line sectional drawing, FIG.5 (C) is CC sectional view taken on the line of FIG.5 (A).

[Explanation of symbols]

1 ... Engine wall, 2 ... Distributor, 3
... the case of the distributor 2, 4 ... the peripheral side wall of the case, 5 ... the flange portion, 6 ... the center axis of rotation of the case 3, 7
... Arc-shaped long hole, 8 ... Holding bolt, 9 ... Bolt head, 1
0 ... Top surface of bolt head 9, 11 ... Square hole for tool engagement, 12
... sealing device, 13 ... outer peripheral side surface of bolt head 9, 14 ... detent engagement piece, 15 ... washer, 16 ... cylindrical pipe, 17 ... plug.

Claims (1)

[Claims] 1. A structure in which a case (3) of a distributor (2) is rotatably attached to a machine wall (1) of an engine body, and an ignition timing can be adjusted based on a rotating posture of the case (3). Then, the flange portion (5) is derived from the peripheral side wall (4) of the case (3), and the case (3) is attached to the flange portion (5).
The circular arc-shaped long hole (7) centering around the rotation center axis (6) is opened, and the holding bolt (8) inserted into the circular arc-shaped long hole (7) is screwed into the machine wall (1) of the engine body. And this holding bolt
The flange part (5) is sandwiched between the bolt head (9) of (8) and the machine wall (1) of the engine body so that the case (3) can be fixed in a predetermined rotational posture. In the spark ignition engine power distribution device configured, a tool engaging square hole is formed on the top surface (10) of the cylindrical bolt head (9).
The bolt with square hole in which (11) is recessed is the above holding bolt.
A sealing tool (12), which is used as (8) and is constructed by fixing a metal cylindrical pipe (16) to a metal washer (15) formed by bending a detent engagement piece (14), is attached to a bolt head ( 9), insert the holding bolt (8) through the washer (15), sandwich the washer (15) between the bolt head (9) and the flange portion (5), and close the closure (12). ) Is fixed and the cylindrical bolt head
Attach the cylindrical pipe (16) to the outer peripheral side surface (13) of (9),
The detent engagement piece (14) is inserted into the arcuate elongated hole (7) to detent the sealing tool (12) with respect to the flange portion (5), and the tool engagement square hole (11) is plugged ( A power distribution device for a spark ignition type engine, which is configured by press-fitting 17).