JP2864325B2 - Power distribution device for spark ignition engine - Google Patents

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 a user of the engine from changing ignition timing.

[0002]

2. Description of the Related Art FIG. 3 shows a prior art of a power distribution device of a spark ignition type engine. This is similar to the present invention.
It has the following basic structure. That is, as shown in FIG. 3A, the breaker 103 is supported on the case 102 of the distributor 101, and the cam shaft 104 is rotatably supported on the case 102. As shown in FIG.
The configuration is such that the contact portion 106 of the breaker 103 is opened and closed by the cam portion 105 of 04.

[0003] As shown in FIG. 3 (A), 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 rotatably inserted into the boss insertion hole 111, and the input end 112 of the cam shaft 104 derived from the shaft insertion boss 108 is connected to the output end 114 of the output shaft 113 on the engine body 109 side. The flange portion 115 is led out of the case 102 and, as shown in FIG. 3B, the flange portion 115 has an arc-shaped advance angle adjusting slot 117 centered on the axis 116 of the shaft insertion boss 108. Open, Fig. 3
As shown in (A), a fastener 118 inserted into the advance angle adjusting slot 117 is attached to the machine wall 110 of the engine body 109, and the case 102 is rotated by a predetermined force by the fastening force of the fastener 118. It is fixed to the machine wall 110 of the engine body 109 in the posture.

In a power distribution device of a spark ignition type engine having such a basic structure, as shown in FIG. 3A, a fastener 118 is loosened, and a case 102 of a distributor 101 is guided by a boss insertion hole 111. By turning, the advance of the ignition timing can be adjusted. That is, when the case 102 is rotated, the position of the breaker 103 supported by the case 102 fluctuates with the rotation of the case 102, but the cam shaft 104 connected to the output shaft 113 on the engine body 109 side. The posture of the cam portion 105 does not fluctuate.
Is changed.

In the above prior art, as shown in FIG. 3A, a holding bolt 119 is used as a fastener 118, and a shaft portion 120 of the holding bolt 119 is inserted into a slot 1 for adjusting the advance angle.
17 and the machine wall 11 of the engine body 109.
0, and the bolt head 1 of the holding bolt 119
The case 102 is fixed by sandwiching the flange portion 115 between the main body 21 and the machine wall 110 of the engine body 109, but the holding bolt 119 can be loosened freely.

[0006]

In the above prior art, since the holding bolt 119 as the fastener 118 can be loosened freely, there is the following problem. That is,
Even if the engine manufacturer ships an engine adjusted to an appropriate ignition timing in order to comply with exhaust gas regulations, the engine user loosens the holding bolt 119 and increases the Case 1
02 can be freely rotated to change the ignition timing. In this case, there is a possibility that an engine that does not comply with the exhaust gas regulations or the like may be operated.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a power distribution device for a spark ignition type engine which can prevent a user of the engine from changing the ignition timing.

[0008]

According to the present invention, as shown in FIG. 1A, a breaker 3 is supported by a case 2 of a distributor 1 and a cam shaft 4 is rotatably supported by a case 2 of a distributor 1. As shown in FIG. 1B, the cam portion 5 of the cam shaft 4 is configured to open and close the contact 6 of the breaker 3, and as shown in FIG. A shaft insertion boss 8 is provided, and the shaft insertion boss 8 is
The cam shaft 4 is rotatably inserted into a boss insertion hole 11 formed in the machine wall 10 and the input end 12 of the cam shaft 4 derived from the shaft insertion boss 8 is connected to the output end of an output shaft 13 on the engine body 9 side. 14, a flange portion 15 is led out of the case 2, and the flange portion 15 has an arc-shaped advance angle centered on the axis 16 of the shaft insertion boss 8 as illustrated in FIG. A slot 18 for adjustment is made, and a fastener 18 inserted into the slot 17 for advance angle adjustment is attached to the machine wall 10 of the engine body 9 as illustrated in FIG. The power distribution device of a spark ignition type engine in which the case 2 is fixed to the machine wall 10 of the engine body 9 in a predetermined rotation posture by a force is characterized as follows.

That is, as exemplified in FIG.
As the fastener 18, a stud bolt 19 and a nut 2
0 and the fixing piece 21,
The fixing piece 21 is formed in a cylindrical shape with a bottom, and the implantation part 22 is penetrated through the bottom part 24 of the fixing piece 21, and the bolt shaft part 23 is formed. The fixing piece 21 is externally fitted to the
As illustrated in (D), the bolt shaft portion 23 and the fixing piece 21 are inserted into the advance angle adjusting slot 17, and the implantation screw portion 22 is screwed into the machine wall 10 of the engine body 9, and the bolt shaft portion The bottom portion 24 of the fixed piece 21 between the portion 23 and the machine wall 10
, The fixing piece 21 is fixed to the machine wall 10, and a nut screwing screw portion 25 formed at the tip of the bolt shaft portion 23 is screwed.
The nut 20 is screwed onto the fixing piece 21 to form a deformed flange portion 26 plastically deformed by the tightening force of the nut 20 at the tip of the fixed piece 21. The deformed flange portion 26 is moved forward by the plastic deformation maintaining force. It is characterized by being pressed against the peripheral portion of the angle adjusting slot 17.

[0010]

The manufacturer of the engine sets the case 2 of the distributor 1 illustrated in FIG. 1 to a predetermined rotation posture and adjusts the ignition timing to an appropriate ignition timing conforming to the exhaust gas regulations and the like. As illustrated, when the nut 20 is screwed into the nut screwing screw portion 25 and the engine is shipped,
Even if the nut 20 is loosened, since the deformed flange portion 26 is pressed against the peripheral portion of the advancing angle adjusting hole 17 due to its plastic deformation maintaining force, the engine user rotates the case 2 to ignite the ignition. The timing cannot be changed. For this reason, it is possible to prevent the operation of the engine that does not conform to the exhaust gas regulations and the like.

[0011]

An embodiment of the present invention will be described with reference to the drawings.
1A and 1B are views for explaining an embodiment of the present invention. FIG. 1A is a longitudinal sectional view around a distributor, and FIG.
It is a BB sectional view taken on the line of (A). FIG. 2 is a view for explaining a main part of FIG. 1. FIG. 2 (A) is an exploded perspective view of a fastener, and FIG.
(B) is a front view around the fastener, and FIG. 2 (C) is FIG. 2 (B).
2D is a cross-sectional view taken along line CC of FIG. 2, and FIG. 2D is a cross-sectional view taken along line DD of FIG. 2C.

As shown in FIG. 1A, this embodiment uses a spark ignition type engine provided with a distributor. The structure of the distributor is as follows. That is, the breaker 3 and the camshaft 4 are housed in the bowl-shaped case 2 of the distributor 1. The breaker 3 is supported on a support plate 40 fixed to the case 2. A cap 30 is fitted to the case 2, and the cap 30 is detachably fixed to the case 2 by an elastic locking piece 31. A breaker 3 is fixed to the case 2 and a cam shaft 4 is rotatably supported on the case 2. 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 configured to contact the cam portion 5 of the cam shaft 4 so that the cam portion 5 opens and closes the contact 6 of the breaker 3. still,
Reference numeral 35 in FIG. 1A indicates a rotor, a central electrode 36,
Is a side electrode.

A shaft insertion boss 8 is provided on the bottom wall 7 of the case 2. 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. I have. The input end 12 of the camshaft 4 derived from the shaft insertion boss 8 is connected to the output end 14 of the output shaft 13 on the engine body 9 side. FIG.
As shown in FIG.
The flange 15 is provided with the shaft insertion boss 8.
An arc-adjusting advance hole 17 having an arc centered on the axis 16 is formed. Then, as shown in FIG. 1 (A), a fastener 18 inserted through the advance angle adjusting slot 17 is attached to the machine wall 10 of the engine body 9, and the fastening force of the fastener 18 causes the case 2 Are fixed to the machine wall 10 of the engine body 9 in a predetermined rotation posture.

In this embodiment, the following contrivance has been made in order to prevent the user of the engine from changing the ignition timing. That is, as shown in FIG. 2A, as the fastener 18, a stud 19, a nut 20, and a fixing piece 21 are used. The stud bolt 19 includes a stud portion 22 formed with a male screw and a bolt shaft portion 23 having a diameter larger than that. The nut 20 is provided with a ridge 27 at the lower end of the screw hole.
The outer periphery of the ridge 27 is a tapered surface. The fixing piece 21 is formed in a bottomed cylindrical shape. Fixed piece 21
The implanted portion 22 penetrates through the bottom portion 24, and the fixing piece 21 is externally fitted to the bolt shaft portion 23, as shown in FIG.
As illustrated in (D), the bolt shaft portion 23 and the fixing piece 21 are inserted into the advance angle adjusting long holes 17, and are inserted into the implant portion 22.
Is implanted in the machine wall 10 of the engine body 9.

The bottom 24 of the fixed piece 21 is sandwiched between the bolt shaft 23 and the machine wall 10, and the fixed piece 21 is fixed to the machine wall 10. The nut 20 is screwed into a nut screwing screw portion 25 formed at the tip of the bolt shaft portion 23, and the deformed flange portion 2 is plastically deformed to the tip of the fixed piece 21 by the tightening force of the nut 20.
6 are formed. The deformed flange portion 26 is in pressure contact with the peripheral portion of the advance angle adjusting long hole 17 by the plastic deformation maintaining force. For this reason, even if the nut 20 is loosened, the fixing piece 21 is stuck and the bolt 19 is forcibly removed.
Unless the deformed flange portion 26 is forcibly raised, the case 2 cannot be rotated.

The flange 15 is made of an aluminum alloy, and the fixing piece 21 is made of iron.
For this reason, the distal end of the fixed piece 21 is
At the time of plastic deformation as 6, the deformed flange portion 26 cuts into the peripheral portion of the advance angle adjusting long hole 17 and depresses it. For this reason, once the deformed flange portion 26 is forcibly raised and the case is turned, and then the nut 20 is tightened, the recess provided at the peripheral portion of the advance adjustment slot 26 and the newly provided recess are formed. Remain, it is confirmed that the ignition timing has been changed by the user of the engine.

[Brief description of the drawings]

FIG. 1 is a view for explaining an embodiment of the present invention, FIG. 1 (A) is a longitudinal sectional view around a distributor, and FIG. 1 (B) is FIG.
It is a BB sectional view taken on the line of (A).

2 (A) is an exploded perspective view of the fastener, FIG. 2 (B) is a front view around the fastener, and FIG. 2 (C) is FIG. FIG. 2B is a cross-sectional view taken along the line CC, and FIG. 2D is a cross-sectional view taken along the line DD in FIG.

3A and 3B are views for explaining the prior art, wherein FIG. 3A is a longitudinal sectional view around a distributor, and FIG. 3B is FIG.
FIG. 7 is a sectional view taken along line BB of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Distributor, 2 ... Case 3, 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 portion, 16 ... 8 axis, 17 ... advancement adjustment long hole, 18 ... fastening tool, 19 ... stud bolt, 20 ... nut, 21 ... fixed Piece, 22: Implanted part, 23: Bolt shaft part, 24
... 21 bottom part, 25 ... screw part for nut screwing, 26 ... deformed flange part.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F02P 7/00 F02P 7/063

Claims (1)

(57) [Claims] A case (2) of a distributor (1) supports a breaker (3) and a cam shaft (4) rotatably supported by a cam (5) of the cam shaft (4). Breaker (3)
The case (2) is configured to be opened and closed, and a shaft insertion boss (8) is provided on the bottom wall (7) of the case (2).
Boss insertion hole made in the wall (10) of the engine body (9)
(11), and the input end (12) of the camshaft (4) derived from the shaft insertion boss (8) is connected to the output shaft (13) of the engine body (9). The flange (15) is led out from the case (2) by being connected to the end (14). The flange (15) has an arcuate shape centered on the axis (16) of the shaft insertion boss (8). The fastener (18) inserted into the advance adjustment slot (17) is attached to the machine wall (10) of the engine body (9), and the fastener ( In the power distribution device for a spark ignition engine in which the case (2) is fixed to the machine wall (10) of the engine body (9) in a predetermined rotation posture by the fastening force of (18), Using the stud bolt (19), nut (20) and fixing piece (21), stud bolt
(19) is composed of an implanted portion (22) and a bolt shaft portion (23) having a diameter larger than that of the implanted portion (22), the fixed piece (21) is formed in a bottomed cylindrical shape, and the bottom portion of the fixed piece (21) ( 24) Implanted part
(22), and fix it to the bolt shaft (23).
(21) is externally fitted to the bolt shaft (23) and the fixing piece (21).
Into the slot for adjusting the advance angle (17), and
(22) is implanted in the machine wall (10) of the engine body (9), and a fixing piece (21) is provided between the bolt shaft (23) and the machine wall (10).
The fixing piece (21) on the machine wall with the bottom (24) of
(10), the nut (20) is screwed into a nut screwing screw (25) formed at the tip of the bolt shaft (23), and the nut (20) is screwed into the tip of the fixing piece (21). A deformed flange portion (26) plastically deformed by the tightening force of (20) is formed, and this deformed flange portion (26) is pressed against the peripheral portion of the advance angle adjusting slot (17) by the plastic deformation maintaining force. A power distribution device for a spark ignition engine.