JPH06323226A - Power distribution device for spark ignition type engine - Google Patents

Abstract

PURPOSE:To prevent engine drive which is inadequate for exhaust gas regulation by bringing the case of a distributor into a specific position of rotation, by adjusting appropriate ignition timing, and by internally fitting and fixing a plug in and to the tool engagement hole of a press bolt fixed to the case. CONSTITUTION:The press bolt 18 inserted into an oblong hole 17 for spark timing advance adjustment is screwed into the wall 10 of an engine main body 9 in a distributor 1. The case 2 is fixed to the main body 9 at a specific position of rotation with the press bolt 18. A bolt 22 with hole, for which a hexagonal tool engagement hole 21 is provided in a recessed form on the top surface 20 of a cylindrical bolt head part 19, is used as the press bolt 18. A spot facing recessed part 23 recessed from the surface of a flange 15 is provided on the peripheral part of the oblong hole 17 for spark timing advance adjustment, to store the bolt head part 9. A cylindrical plug 25 is pressed in the tool engagement hole 21 of the bolt head part 19 and is internally fitted in and fixed to the hole so that the plug is not removed. A user of the engine cannot loosen the press bolt 19.

Description

Detailed Description of the Invention

[0001]

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

[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 has the following basic structure as in the present invention. That is, FIG. 4 (A)
As shown in FIG.
2 supports the breaker 103 and rotatably supports the cam shaft 104. As shown in FIG. 4B, the cam portion 105 of the cam shaft 104 allows the contact point 106 of the breaker 103 to be supported.
Is configured to open and close.

As shown in FIG. 4A, a shaft insertion boss 108 is provided on the bottom wall 107 of the case 102, and the shaft insertion boss 108 is attached to the machine wall 110 of the engine body 109.
The cam shaft 104 is connected to an output end 114 of an output shaft 113 on the engine body 109 side by rotatably inserting it into a boss insertion hole 111 formed in the shaft insertion boss 108. 4B, the flange portion 115 is led out from the case 102, and as shown in FIG. 4B, an arc-shaped advance angle adjusting elongated hole 117 centered on the axis 116 of the shaft insertion boss 108 is formed in the flange portion 115. Open, Figure 4
As shown in (A), the holding bolt 118 inserted through the long hole 117 for adjusting the advance angle is attached to the machine wall 1 of the engine body 109.
10 is screwed into the bolt head 1 of the holding bolt 118.
The flange portion 115 is sandwiched between 19 and the machine wall 110 of the engine body 109, and the case 102 is fixed to the machine wall 110 of the engine body 109 in a predetermined rotation posture.

In the spark ignition type engine power distribution device having such a basic structure, as shown in FIG. 4A, the holding bolt 118 is loosened, and the case 102 of the distributor 101 is guided by the boss insertion hole 111. By rotating it, it is possible to adjust the advance angle of the ignition timing. That is, when the case 102 is rotated, the case 10
The position of the breaker 103 supported by 2 is the case 102.
However, since the posture of the cam portion 105 of the cam shaft 104 connected to the output shaft 113 on the engine body 109 side does not change, the breaker 1 by the cam portion 105 changes.
This is because the lift timing of 03 is changed.

In the above-mentioned prior art, as shown in FIG. 4 (A), the flange portion 115 is sandwiched between the bolt head 119 of the holding bolt 118 and the machine wall 110 of the engine body 109, and the case 102 is predetermined. Although it is fixed in the rotating posture, the pressing bolt 118 can be freely loosened.

[0006]

In the above-mentioned prior art, since the holding bolt 118 can be loosened freely, there are the following problems. That is, even if the engine manufacturer ships the engine adjusted to an appropriate ignition timing in order to comply with exhaust gas regulations, etc., the engine user loosens the holding bolt 118 for the purpose of increasing the output, etc. By rotating the case 102 of 101,
There is a risk of changing the ignition timing. In this case, an engine that does not comply with exhaust gas regulations may be operated.

An object of each of the present invention is to provide a power distribution device for a spark ignition type engine, which can prevent the engine user from changing the ignition timing.

[0008]

In both the first and second inventions, as shown in FIG. 1A, a breaker 3 is supported by a case 2 of a distributor 1 and a cam shaft 4 is rotatable. 1B, the cam portion 5 of the camshaft 4 is configured to open and close the contact 6 of the breaker 3, and as shown in FIG. 1A,
A shaft insertion boss 8 is provided on the bottom wall 7 of the case 2, and the shaft insertion boss 8 is rotatably inserted into a boss insertion hole 11 formed in the machine wall 10 of the engine body 9 and led out from the shaft insertion boss 8. The input end 12 of the camshaft 4 is connected to the output end 14 of the output shaft 13 on the engine body 9 side, and the flange 15 is led out from the case 2 as illustrated in FIG. 1B. The axis line 1 of the shaft insertion boss 8 is attached to the flange portion 15.
An arc-shaped lead angle adjusting elongated hole 17 centered at 6 is opened, and as shown in FIG. 1A, the holding bolt 18 inserted into the lead angle adjusting elongated hole 17 is used to mount the holding bolt 18 on the machine wall of the engine body 9. 10
The flange portion 15 is sandwiched between the bolt head 19 of the holding bolt 18 and the machine wall 10 of the engine body 9, and the case 2 is mounted on the machine body 9 in a predetermined rotational posture. The spark ignition engine power distribution device fixed to the wall 10 is characterized by the following.

That is, in the first invention, as illustrated in FIG. 2, as the holding bolt 18, a holed bolt 22 having a tool engaging hole 21 recessed in a top surface 20 of a cylindrical bolt head 19 is used. In addition, a counterbore recess 23 recessed from the surface of the flange 15 is provided at the peripheral edge of the advance angle adjusting slot 17, and the bolt head 19 is housed in the counterbore recess 23 and the counterbore is The bolt head 19 is seated on the inner bottom surface 24 of the recess 23, and the plug 25 is non-removably fitted and fixed in the tool engagement hole 21 of the bolt head 19.

In the second invention, as illustrated in FIG. 3, a square head bolt 26 having a prismatic bolt head 19 is used as the holding bolt 18, and the advance angle adjusting elongated hole 17 is formed. A counterbore recess 23 recessed from the surface of the flange 15 is provided on the peripheral edge, the bolt head 19 is housed in the counterbore recess 23, and the counterbore recess 2 is formed.
3, the bolt head 19 is seated on the inner bottom surface 24, and the cylindrical side surface 27 of the peripheral side surface 27 is irremovably fitted and fixed to the bolt head 19.

[0011]

[Operation of the invention]

(First Invention) The engine manufacturer rotates the case 2 of the distributor 1 illustrated in FIG. 1 to adjust the ignition timing to an appropriate value, and then inserts a tool such as a wrench into the tool engagement hole 21 illustrated in FIG. Is engaged and the holding bolt 18 is tightened by the operation of this tool to fix the case 2. Then, the plug 25 is fitted and fixed in the tool engagement hole 21 and the engine is shipped. In this way, the engine user cannot freely loosen the holding bolt 18.

That is, the plug 25 is inserted in the tool engaging hole 21.
When the bolt is fitted in and fixed, the bolt head 19 has no engaging portion for a tool such as a wrench, and even if the bolt head 19 is gripped by the pliers and is forcibly turned, the tip of the pliers that grips the bolt head 19 Is to contact the inner peripheral surface of the narrow counterbore recess 23.

(Second Invention) The engine manufacturer
After rotating the case 2 of the distributor 1 illustrated in (A) and adjusting to an appropriate ignition timing, a tool such as a wrench is engaged with the prismatic bolt head 19 illustrated in FIG. The case 2 is fixed by tightening the holding bolt 18 by operation. Then, the ring material 28 is externally fitted and fixed to the bolt head 19 and the engine is shipped. In this way, the engine user cannot freely loosen the holding bolt 18.

That is, when the ring member 28 is externally fitted and fixed to the bolt head 19, the bolt head 19 has no engaging portion for a tool such as a wrench, and the peripheral side surface 27 has a cylindrical ring member 28.
There is no engaging part of a tool such as a wrench, and even if the bolt head 19 is gripped with the pliers 28 together with the pliers by force, the tip of the pliers holding the pliers 28 has a narrow spot facing. This is because it hits the inner peripheral surface of the recess 23.

[0015]

【The invention's effect】

(First Invention) The engine manufacturer sets the case of the distributor in a predetermined rotational posture, adjusts the ignition timing to an appropriate one that complies with exhaust gas regulations, etc., and then fixes the case with a holding bolt to provide a tool engaging hole. When the engine is shipped with the plug internally fitted and fixed, the engine user cannot freely loosen the holding bolt, and cannot change the ignition timing by rotating the case. Therefore, it is possible to prevent the operation of the engine that does not comply with exhaust gas regulations and the like.

(Second Invention) The engine manufacturer sets the case of the distributor in a predetermined rotating posture, adjusts the ignition timing to an appropriate one in conformity with exhaust gas regulations, etc., and then fixes the case with a holding bolt. When the engine is shipped with the ring member externally fitted and fixed to the head, the engine user cannot freely loosen the holding bolt and cannot change the ignition timing by rotating the case. Therefore, it is possible to prevent the operation of the engine that does not comply with exhaust gas regulations and the like.

[0017]

Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram for explaining a first embodiment corresponding to the first invention,
FIG. 1 (A) is a vertical cross-sectional view around the distributor, FIG.
FIG. 1B is a sectional view taken along line BB of FIG. 2A and 2B are views for explaining a main part of FIG. 1, FIG. 2A is a front view of the periphery of a bolt head, FIG. 2B is a sectional view taken along line BB of FIG. 2A,
FIG. 2C is a sectional view taken along the line CC of FIG.

As shown in FIG. 1A, a spark ignition engine having a distributor is used in this first embodiment. The distributor configuration is as follows. That is, the breaker 3 and the cam shaft 4 are housed in the bowl-shaped case 2 of the distributor 1.
The breaker 3 is a support plate 40 fixed to the case 2.
Supported by. A cap 30 is fitted in the case 2, and the cap 30 is detachably fixed to the case 2 by a locking piece 31 having elasticity. A breaker 3 is fixed to the case 2 and a cam shaft 4 is rotatably supported. As shown in FIG. 1B, the breaker 3 includes a breaker plate 32 and a breaker arm 33.
And the cam heel 34 of the breaker arm 33.
Is contacted with the cam portion 5 of the cam shaft 4, and the contact portion 6 of the breaker 3 is opened and closed by the cam portion 5. still,
Reference numeral 35 in FIG. 1A indicates a rotor, a central electrode 36, and 37
Is a lateral electrode.

Further, a shaft insertion boss 8 is provided on the bottom wall 7 of the case 2, and the shaft insertion boss 8 is rotatably inserted into a boss insertion hole 11 formed in the machine wall 10 of the engine body 9. There is. The input end 12 of the cam shaft 4 led out from the shaft insertion boss 8 is connected to the output end 14 of the output shaft 13 on the engine body 9 side. Also, FIG.
As shown in (B), from the case 2 to the flange portion 15
And the shaft insertion boss 8 is inserted into the flange portion 15.
An arc-shaped advance angle adjusting elongated hole 17 centered on the axis 16 is formed. Then, as shown in FIG. 1 (A), the holding bolt 18 inserted into the lead angle adjusting elongated hole 17 is screwed into the machine wall 10 of the engine body 9 and the head portion 19 of the holding bolt 18 The flange portion 15 is sandwiched between the engine wall 9 of the engine body 9 and the case 2 is fixed to the engine wall 10 of the engine body 9 in a predetermined rotation posture.

In the first embodiment, the following measures are taken in order to prevent the engine user from changing the ignition timing. That is, as illustrated in FIG. 2, a holed bolt 22 in which a hexagonal tool engaging hole 21 is recessed in a top surface 20 of a cylindrical bolt head 19 is used as the pressing bolt 18. Then, a counterbore recess 23 recessed from the surface of the flange 15 is provided on the peripheral edge of the advance angle adjusting slot 17, and the bolt head 19 is housed in the counterbore recess 23 and The bolt head 19 is seated on the inner bottom surface 24 of the counterbore recess 23. Further, a cylindrical plug 25 is press-fitted into the tool engaging hole 21 of the bolt head 19 and is fixed in a non-removable manner. Therefore, the engine user cannot loosen the holding bolt 19. still,
Reference numeral 39 in the drawing is a washer.

Next, the second embodiment will be described. FIG. 3 is a view for explaining the main part of the second embodiment corresponding to the second invention,
3 (A) is a front view around the bolt head, FIG. 3 (B) is a sectional view taken along the line BB of FIG. 3 (A), and FIG. 3 (C) is a sectional view taken along the line C-C of FIG. 3 (B). It is a figure.

In the first aspect of the invention, as shown in FIG. 2, a holed bolt 22 is used as the pressing bolt 18,
The plug 25 is internally fitted and fixed in the tool engaging hole 21 of the bolt head 19. However, in the second embodiment, instead of this, as shown in FIG. 3, the holding bolt 18 has a hexagonal columnar shape. A square headed bolt 26 having a bolt head 19 is used, and a peripheral side surface 27 has a cylindrical ring member 28 press-fitted into the bolt head 19, which is non-removably externally fixed. Further, a counterbore recess 23 recessed from the surface of the flange portion 15 is provided at the peripheral edge of the advance angle adjusting elongated hole 17, and the bolt head 19 is housed in the counterbore recess 23 and the counterbore is provided. The bolt head 19 is seated on the inner bottom surface 24 of the recess 23 and other points are the same as in the first embodiment.

The contents of each embodiment are as described above, but the present invention is not limited to the above embodiments. For example, in the first embodiment, as shown in FIG. 2, the tool engaging hole 21 is hexagonal and is provided at one central portion of the top surface 20 of the bolt head 19 so that it can be engaged with a hexagonal wrench. However, the tool engaging hole 21 may have another shape such as a triangle, a quadrangle or the like, or a plurality of holes, as long as it can be engaged with a tool such as a wrench. Further, in the second embodiment, as shown in FIG. 3, the square head bolt 26 having the hexagonal columnar bolt head 19 is used, but the shape of the bolt head 19 is a square pole or the like. It may be polygonal.

[Brief description of drawings]

FIG. 1 is a view for explaining a first embodiment corresponding to the first invention, and FIG. 1 (A) is a vertical cross-sectional view around a distributor,
FIG. 1B is a sectional view taken along line BB of FIG.

2A and 2B are views for explaining a main part of FIG. 1, in which FIG. 2A is a front view of the periphery of a bolt head, and FIG. 2B is BB of FIG. 2A.
2C is a sectional view taken along the line CC in FIG. 2B.

FIG. 3 is a view for explaining a main part of a second embodiment corresponding to the second invention, and FIG. 3 (A) is a front view of the vicinity of a bolt head, FIG.
3B is a sectional view taken along the line BB of FIG. 3A, and FIG. 3C is a sectional view taken along the line C-C of FIG. 3B.

4A and 4B are diagrams illustrating a conventional technique, FIG. 4A is a vertical cross-sectional view of the periphery of a distributor, and FIG. 4B is FIG. 4A.
FIG. 6 is a sectional view taken along line BB of FIG.

[Explanation of symbols]

1 ... Distributor, 2 ... 1 case, 3 ... Breaker, 4 ... Cam shaft, 5 ... 4 cam part, 6 ... 3 contacts, 7 ...
2 bottom wall, 8 ... shaft insertion boss, 9 ... engine body, 10 ...
9, machine wall, 11 ... boss insertion hole, 12 ... 4 input end, 1
3 ... Output shaft, 14 ... 13 output end, 15 ... Flange, 16 ... 8 axis, 17 ... Advance adjusting slot, 18 ... Press bolt, 19 ... 18 bolt head, 20 ... 19 Top surface, 21 ... Hole for tool engagement, 22 ... Bolt with hole, 23 ...
Counterbore recess, inner bottom surface of 24 ... 23, 25 ... plug, 26
… Square headed bolts, 27… 19 peripheral side surfaces, 28… Ring materials.

Claims (2)

[Claims] 1. A breaker (3) is supported on a case (2) of a distributor (1) and a cam shaft (4) is rotatably supported by a cam portion (5) of the cam shaft (4). Breaker (3)
It is configured to open and close the contact (6) of the above, and the shaft insertion boss (8) is provided on the bottom wall (7) of the case (2), and this shaft insertion boss (8)
Boss insertion hole made in the machine wall (10) of the engine body (9)
The output end (12) of the engine body (9) side is output from the input end (12) of the cam shaft (4) which is inserted into (11) rotatably and is led out from the shaft insertion boss (8). The flange portion (15) is connected to the end portion (14), the flange portion (15) is led out from the case (2), and the flange portion (15) has an arc shape centered on the axis (16) of the shaft insertion boss (8). The long hole (17) for adjusting the advance angle is opened, and the holding bolt (18) inserted into the long hole (17) for adjusting the advance angle is screwed into the machine wall (10) of the engine body (9), Bolt head (19) of bolt (18) and machine wall of engine body (9)
Power distribution of a spark ignition engine in which the case (2) is fixed to the machine wall (10) of the engine body (9) by sandwiching the flange portion (15) between the case (2) and the (10). In the device, as the pressing bolt (18), a cylindrical bolt head is used.
Using a holed bolt (22) having a tool engaging hole (21) recessed on the top surface (20) of (19), a flange portion (15) is provided at the periphery of the above-mentioned advance angle adjusting elongated hole (17). A counterbore recess (23) recessed from the surface is provided, the bolt head (19) is accommodated in the counterbore recess (23), and the counterbore recess (23) is provided.
The bolt head (19) is seated on the inner bottom surface (24) of the bolt, and the plug (25) is irremovably fitted and fixed in the tool engaging hole (21) of the bolt head (19). Spark ignition engine power distribution device. 2. A case (2) of a distributor (1) supports a breaker (3) and a cam shaft (4) is rotatably supported by a cam portion (5) of the cam shaft (4). Breaker (3)
It is configured to open and close the contact (6) of the above, and the shaft insertion boss (8) is provided on the bottom wall (7) of the case (2), and this shaft insertion boss (8)
Boss insertion hole made in the machine wall (10) of the engine body (9)
The output end (12) of the engine body (9) side is output from the input end (12) of the cam shaft (4) which is inserted into (11) rotatably and is led out from the shaft insertion boss (8). The flange portion (15) is connected to the end portion (14), the flange portion (15) is led out from the case (2), and the flange portion (15) has an arc shape centered on the axis (16) of the shaft insertion boss (8). The long hole (17) for adjusting the advance angle is opened, and the holding bolt (18) inserted into the long hole (17) for adjusting the advance angle is screwed into the machine wall (10) of the engine body (9), Bolt head (19) of bolt (18) and machine wall of engine body (9)
Power distribution of a spark ignition engine in which the case (2) is fixed to the machine wall (10) of the engine body (9) by sandwiching the flange portion (15) between the case (2) and the (10). In the device, as the holding bolt (18), a prismatic bolt head is used.
By using a square head bolt (26) having (19), a counterbore recess (23) recessed from the surface of the flange (15) is provided at the peripheral edge of the advance angle adjusting slot (17). Counterbore recess
While accommodating the bolt head (19) in (23),
On the inner bottom surface (24) of this counterbore recess (23), the bolt head (1
9) is seated, and the peripheral side surface (27) is attached to the bolt head (19).
Fixedly fitted the cylindrical ring material (28) onto the outside,
A power distribution device for a spark ignition type engine.