JPS6229637B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a governor advance device that advances engine ignition timing in response to an increase in engine speed.

Here, in the case of a power distribution device to which this type of governor advance device is installed, the bottom of the housing should be It has been proposed to install a governor advance device on top of this magnet generator.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention showing an entire power distributor of this kind will be described in detail below with reference to FIG. In the figure, 1 is the housing of the power distributor, 2 is the rotating shaft supported by the housing 1 via a bearing 3, and 4 is the rotating shaft 2.
A movable plate is rotatably supported via a bearing 5, and 6 is a space collar loosely fitted to the rotating shaft 2 to position the bearing 5. A roll pin 8 is press-fitted into the through hole 7 and is integrally fixed to the rotating shaft 2. A stator 9 is riveted to the movable plate 4 via a ring-shaped rubber magnet 10, and has four magnetic pole portions 9a formed at equal intervals on its outer periphery. 11 are these magnetic pole parts 9a
and four magnetic pole parts 11 facing each other through a predetermined space.
12 is a cylindrical body which is loosely fitted onto the rotating shaft 2, and the rotor 11 is fixed thereto. 13 is a resin plate fixed within the housing 1, and has a bobbin 13a around which a signal coil 14 is wound.

16 is a cam type governor advance device, which is composed of the following parts. That is, 17 is a cross-shaped governor plate fitted to the leading end of the cylinder 12;
Reference numeral a denotes a mounting portion thereof, and screw holes 17b are formed at both ends. Reference numeral 18 indicates a pair of spindles implanted at predetermined positions on this governor plate 17, 18a indicates a spring receiving portion thereof, and 19 indicates this pair of spindles 18.
A governor weight is loosely fitted to each, a pair of stopper pins 20 are implanted at predetermined positions on the governor plate 17, and a bolt 21 is attached to the leading edge of the rotating shaft 2.
The guide plate is fixed by the guide plate 22, and has elongated holes 21a that serve as engaging portions with which the pair of stopper pins 20 are respectively engaged.

23 is a pair of eccentric pins rotatably attached to a predetermined position on the outermost diameter part of this guide plate 21;
23a is the spring receiving part, 24 is the eccentric pin 23
The spring receiving portion 23a of the spindle 18 and the spring receiving portion 1 of the spindle 18
A pair of springs 25 stretched between 8a and 8a.
A power distribution rotor is fixed to a mounting portion 17a of the governor plate 17 by a screw 26 being screwed into a screw hole 17b thereof, and a cap 27 is fitted into the housing 1.

Next, the operation of this embodiment will be explained. First, when the rotary shaft 2 is rotationally driven by the engine in the direction of arrow A shown in FIG.
6, the magnetic pole part 11 continuously approaches, opposes, and moves away from the magnetic pole part 9a of the stator 9. and repeat. Then, since the amount of magnetic velocity interlinking with the signal coil 14 changes, an ignition signal voltage with a positive and negative waveform is induced in the signal coil 14 based on this magnetic flux change, and this ignition signal voltage is guided to the ignition circuit case. It will be destroyed. Thus, the ignition circuit induces a high voltage for ignition in the ignition coil.

In this way, the ignition signal voltage is induced and the high voltage for ignition is induced, and the function of the governor advance device 16 advances the engine ignition timing as the engine speed increases. That is, when the rotational speed of the rotating shaft 2 increases as the engine rotational speed increases, the governor weight 19 resists the spring force of the spring 24 by the centrifugal force caused by the rotational force of the spindle 18, and moves in the direction opposite to the arrow. Rotate and jump in direction A. At this time, since the guide plate 21 is on the drive side, it is viewed as a fixed side, and since the governor weight 19 slides on the end surface 21b of the guide plate 21 in the direction of the large diameter 19a, the holding position of the spindle 18 is in the rotation direction. As a result, the governor plate 1 on which the spindle 18 is installed
7 is a guide plate 21, which is rotated by a predetermined angle in the direction of arrow A with respect to the rotating shaft 2. Then, since the rotor 11 is also rotated in the direction of arrow A through the cylinder 12, its magnetic pole portion 11a is
The timing at which the ignition signal faces the magnetic pole portion 9a is advanced, the phase of the ignition signal voltage waveform induced in the signal coil 14 is advanced, and the engine ignition timing is advanced.

Here, the conventional device will be explained based on FIGS. 3 and 4. In the figure, the governor plate 17 is fixed to the rotating shaft 2, while the guide plate 21 is fixed to the cylinder 12, and the other configurations are the same as in FIG. 2.

Further, this governor advance angle device 16 is connected to the housing 1.
Because of this, the rotating direction of the rotating shaft 2 is in the direction of the arrow B shown in FIG. 3. When the rotating shaft 2 is rotated in the direction of the arrow B, the same movement as in the embodiment of the present invention is performed, and the guide plate 21 is rotated relative to the governor plate 17, that is, the rotating shaft 2, so that the same movement occurs. It provides angular function.

By the way, the pressure inside the cylinder of the engine always fluctuates before and after the top dead center, so the angular velocity before the top dead center is smaller than the angular velocity after the top dead center, and the angular velocity of the rotating shaft 2 driven by the engine changes constantly. , there is so-called torque fluctuation. The rotating shaft 2 accurately synchronizes and follows rapid changes in the angular velocity of the engine. The spring 24 is fixed to the governor weight 19.
Since the guide plate 21 is connected to the pair of springs 24 through the guide plate 21, the inertia force of itself and the inertia force of the pair of governor weights 19 are superimposed on the guide plate 21. The rotational change is made to a balanced position, and therefore, a much larger follow-up delay occurs in response to rapid angular velocity fluctuations of the rotating shaft 2, that is, the governor plate 17. Due to this follow-up delay of the guide plate 21, the relative position of the rotary shaft 2 and the cylinder 12 in the direction of the arrow B fluctuates greatly, causing a drawback that the ignition timing changes in terms of angular velocity.

However, in this embodiment of the invention, the governor plate 17
is fixed to the cylindrical body 12, while the guide plate 21 is fixed to the rotating shaft 2, and the rotating direction of the rotating shaft 2 is set in the direction of arrow A, which is opposite to the conventional device. The governor weight 19 that opens rotates in the opposite direction to the rotational direction A, and this rotational moment is in the opposite direction to the inertial force of the governor plate 17 generated in the rotational direction A. Also, due to the jump of the governor weight 19, the displacement
The returning force of the spring 24 that has been
This will act in the opposite direction to the inertial force of 7.

Therefore, before the top dead center, the guide plate 2
1 acts in the deceleration direction, and a pair of governor weights 1
Since the governor plate 17 tries to maintain rotation due to the inertial force of the governor plate 17 including the guide plate 21, the governor plate 1
7 moves in the advancing direction, but the distance between the eccentric pin 23 and the spindle 18 becomes wider, and the return force of the spring 24 increases, and the rotational moment of the governor weight 19 also becomes equal to the return force of the spring 24. Since they act in the same direction, displacement of the governor plate 17 can be suppressed. Therefore, the governor plate 17 is prevented from being largely displaced in the advance direction with respect to the guide plate 21.
Following the decrease in the angular acceleration of the guide plate 21, the angular acceleration of the governor plate 17 also decreases. That is, the relative position of the cylindrical body 12 in the direction of arrow A does not change due to rapid changes in the rotating shaft 2, and desired ignition timing characteristics can be obtained.

By the way, an apparatus which exhibits an effect similar to this embodiment of the invention has been proposed as US Pat. No. 3,923,028, and its structure is as shown in FIGS. 5 and 6. That is, in this conventional device, a base plate 28 in which a pair of stopper pins 20 are implanted is fixed to the cylinder body 12, and the pair of stopper pins 20 are attached to the base plate 28.
penetrates into an elongated hole 17 formed in a governor plate 17 fixed to the leading end of the rotating shaft 2. Moreover, the pair of stopper pins 20 are fixed to the I-shaped guide plate 21, and as a result, the guide plate 21 and the base plate 28 are connected to the stopper pins 20.
They are integrally fixed via 0. Also, a pair of spindles 1 installed on the governor plate 17
8, a pair of L-shaped governor weights 19 are loosely fitted into each of the guide plates 21 in sliding contact with the end surface 21a of the guide plate 21. A spring 24 is stretched between the spring receiving portion 18a of the spindle 18 and the spring receiving portion 20 of the stopper pin 20. Now,
The operation of this conventional device is such that when the governor plate 17 is rotated in the direction of arrow A by the rotary shaft 2, the guide plate 21 is rotated in the direction of arrow A against the spring 24 because the governor weight 19 flies open.
When this guide plate 21 is rotated, the base plate 28 which is integral with it is also rotated in the same direction.
Therefore, the relative position between the cylinder 12 and the rotating shaft 2 changes, and the ignition timing is advanced.

Now, considering the relative positional fluctuations between the rotating shaft 2 and the cylindrical body 12, we can see that the guide plate 21 tends to be delayed in following the rapid angular velocity fluctuations of the governor plate 17 due to the inertial force acting thereon. However, what is important here is a pair of governor weights 1
9 is supported on the governor plate 17 via a spindle 18, and this governor weight 19
The governor weight 1 shown in the embodiment of the present invention has a long and narrow L-shaped shape.
The jump force of the governor weight 19 does not act in a direction to cancel the inertia force of the guide plate 21, but rather the jump force of the governor weight 19 acts in a direction that enhances the inertia force of the guide plate 21, albeit slightly. . However, this promoting flying force is considered to be a small value when compared with the first conventional device shown in FIGS. There will be fewer delays. Furthermore,
If the governor weight 19 is rotated in the direction of arrow A in order to obtain the above-mentioned effects, the configuration becomes very complicated as is clear from the figure. That is, in order to have a double structure as in the embodiment of the present invention, the guide plate 21 is fixed to the rotating shaft 2, the governor plate 17 is fixed to the cylinder body 12 and rotated in the direction of arrow A, and the governor weight 19 is fixed to the cylinder body 12 and rotated in the direction of arrow A. It is obvious that if the cylindrical body 12 flies open, the cylinder 12 will be rotated in the opposite direction of the arrow A, and the advancing function will no longer be obtained.
Therefore, a new component called a base plate 28 is added to form a triple structure as shown in FIGS. 5 and 6, thereby providing the function of rotating the cylindrical body 12 in the direction of arrow A. Therefore, the governor advance device 1
6, the number of parts increases and the configuration becomes complicated.

However, in the embodiment of the present invention, the governor plate 17 is fixed to the cylinder body 12 by utilizing the simple double structure of the conventional device shown in FIGS.
The governor advance device 16 is constructed by simply being fixed to the leading edge of the rotating shaft 2, without unnecessary design such as changing the placement of other parts or adding new parts. As a result, design time can be greatly shortened, parts can be reused, and manufacturing can be done at low cost. Moreover, closely related to this configuration, the rotating shaft 2 is rotated in the direction of arrow A, so the rotating shaft 2
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The follow-up delay of the cylinder 12 relative to the engine speed can be reduced to the maximum extent possible, and stable ignition timing characteristics can be obtained, which greatly contributes to exhaust gas removal measures.

Further, since the governor advance device 16 is attached to the outermost opening of the housing 1, it also has the advantage that the ignition timing characteristics can be easily adjusted using the eccentric pin 23.

Note that this invention is not limited to the examples, but includes all embodiments.

As described above, in the present invention, since the guide plate is rotated in the direction opposite to the direction in which the governor weight flies, the delay in following the axis of rotation of the cylindrical body can be reduced, and stable ignition timing characteristics can be obtained.

Moreover, the structure for obtaining the effect can be easily and inexpensively manufactured by using the same structure as the structure conventionally used.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a plan view of the governor advance device 16 in FIG. 1, and FIGS. 3 and 5 are conventional governor advance devices 16. The plan view, FIG. 4, and FIG. 6 are cross-sectional views showing the governor advance device 16 in FIGS. 3 and 5, respectively. In the figure, 1 is the housing, 2 is the rotating shaft, 12
16 is a cylinder, 16 is a governor advance device, 17 is a governor plate, 17a is a mounting part, 17b is a screw hole, 18
is a spindle, 18a, 20a, 23a are spring receiving parts, 19 is a governor weight, 20 is a stopper pin, 21 is a guide plate, 21a is a long hole (engaging part), 21b is an end surface, 22 is a bolt, 23 is an eccentric pin, 24 is a spring, and 28 is a base plate. Note that the same reference numerals in each figure indicate the same or corresponding parts. 〓〓〓〓〓

Claims (1)

[Claims] 1. A rotating shaft that is rotationally driven by the engine, a cylinder that is loosely fitted onto this rotating shaft and to which the engine ignition timing determining member is attached, a governor plate that is fixed to this cylinder, and a stopper pin and spindle that are implanted in this governor plate. , a governor weight that is loosely fitted to the spindle and whose center of gravity is located on the rotational direction side of the rotating shaft relative to the loosely fitting part with the spindle; an engaging part that is fixed to the upper part of the rotating shaft and that is engaged with the stopper pin; A guide plate formed with an end surface that slides so that the governor weight slides open in a direction opposite to the rotational direction of the rotating shaft as the rotation speed increases, and a pin implanted at a predetermined position of the guide plate. , and a governor advance device comprising a spring stretched between the pin and the spindle.