JPH0423108B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a governor advance device for a power distribution device for an automobile.

[Background of the invention]

FIG. 1 shows a plan view of a generally known conventional governor advance device as seen in Japanese Utility Model Publication No. 42-12898, in which 1 is a shaft;
A weight mount 6 is fitted and fixed to the weight mount 6, and weight support shafts 2, 3 and spring hooks 4, 5 are fixed to the weight mount 6 around the shaft 1.
Weights 7 and 8 are rotatably supported at one end by weight support shafts 2 and 3, and first and second rods 9 and 10 are installed at the other end, respectively. The first and second rods 9 and 10 are rectangular first and second slotted holes 13 respectively formed in a timing lever 12 which is integrally fixed to a rotor shaft 11 with rotating magnetic poles (not shown). , 14, respectively. First and second long slot holes 1
3 and 14 are opened at positions where the longitudinal direction thereof is the radial direction. FIG. 2 is an explanatory diagram of the advance angle characteristic, with the horizontal axis representing the engine speed and the vertical axis representing the ignition advance angle. 15 is the first spring that acts from the start point A of the advance angle of zero on the solid line curve D of the advance angle characteristic in FIG. 2, and 16 is the first spring 15 that acts from the intermediate point B.
This is a second spring that acts in cooperation with the spring hooks 4 and 5, and has one end fixed to the spring hooks 4 and 5, and the other end fixed to the first and second weights 7 and 8, respectively. still,
Arrow H indicates the rotation direction (advanced angle).

In the above structure, when the angular acceleration of the engine during low-speed rotation becomes negative before the top dead center, the rotor shaft 11 moves to the first and second slots via the first and second slotted holes 13 and 14 due to inertia. Rod 9,
10, a force F is applied in the direction in which the first rod 9 is pressed by the rotation of the first weight 7 in the 90 degree direction from the rectangular longitudinal inner wall of the first slotted hole 13 (the second rod 10 side is not shown). , the first and second weights 7 and 8 are opened by a moment Fl.
For this reason, an over-advanced angle phenomenon may occur, as shown by the two-dot chain line E of the advance angle characteristic in FIG. 2, and a problem related to the knocking zone may occur. In addition, some consideration has been given to the overadvance angle of the governor in the past, as in Publication of Utility Model Publication No. 12898/1973, but this was insufficient for low speeds.

Japanese Patent Laid-Open No. 53-90537 describes an example of a device in which the timing lever is tilted by an angle E in which an elongated hole is drilled in the rotation direction, but overadvance due to torque fluctuations at low engine speeds is not taken into consideration. I wasn't there. In addition, Japanese Utility Model Publication No. 46-8259 also describes an example of a device in which the elongated hole of the timing lever is tilted by a certain angle in the direction of rotation. It wasn't taken into account.

[Purpose of the invention]

The present invention has been developed in view of the above-mentioned situation, and it is an object of the present invention to provide a governor advance device that can prevent overadvance due to torque fluctuations that tend to occur when the engine runs at low speeds.

[Summary of the invention]

The present invention includes two weight spindles installed around the axis of the shaft on a weight mounting base fixed to a shaft driven by a reciprocating engine, and a weight spindle that rotates at one end of each of the weight spindles. A first weight and a second weight that are freely supported and have first and second rods respectively planted on the other end side, one end of which is connected to the first weight and the other end of which is connected to the weight mounting base, and the rotation speed is adjusted. - a first spring formed to apply a tensile force between the two connection points from the start point of zero advance of the ignition advance curve; one end connected to the second weight and the other end connected to the weight mount; A second spring is connected to the first spring and is formed to apply a tensile force between the two connection points; the second spring is fixed to the rotor shaft loosely fitted to the shaft, and is opened with the longitudinal direction being substantially the radial direction; The first and second rods are slid onto the longitudinal wall surfaces of the first and second slotted holes, respectively. In the governor advance device, which is provided with a timing lever that can be loosely fitted, a weight support shaft that pivotally supports the first weight passes through the center of the first rod when the engine is in a stopped state, and is connected to the first slotted hole. The first rod is parallel to a straight line perpendicular to the rear wall in the shaft rotation direction of the longitudinal wall surface and is in contact with the shaft-side outer peripheral surface of the first rod, and the first rod is free. The position in the first slotted hole where the rod is fitted is a position where a gap g is formed between the first rod and the front wall in the direction of shaft rotation among the longitudinal wall surfaces of the first slotted hole when the engine is stopped. and the second spring is formed so as to apply a tensile force between the two connection points from a point in the middle of the rotation speed-ignition advance angle curve; The radii to the centers of gravity of the first and second weights are the same in the maximum flying state, and the straight line connecting the center of the shaft and the center of the weight support shaft that supports the first weight is The angle _ra formed by the straight line connecting the center of the weight support shaft and the center of the first rod and the straight line connecting the center of the shaft and the center of the weight support shaft that pivotally supports the second weight is the weight support shaft. The relationship between the angle r _b formed by the straight line connecting the center of the rod and the center of the second rod is r _a < r _b , and the outer peripheral end of the longitudinal wall surface of the first slot and the inner peripheral side The straight line connecting the ends is parallel to the straight line connecting the center of the shaft and the center of the first rod, and is inclined in a direction in which the outer end is separated forward in the rotational direction with respect to the straight line passing through the inner end. A straight line connecting the outer peripheral end and the inner peripheral end of the longitudinal wall surface of the two long slots is parallel to the straight line connecting the center of the shaft and the center of the first rod, and with respect to a straight line passing through the inner peripheral end. It is characterized in that the outer peripheral side end portion is inclined in a direction away from the rear in the rotational direction.

[Embodiments of the invention]

Hereinafter, the governor advance device of the present invention will be explained with reference to FIG. 3 using an embodiment, in which the same parts as those in the conventional art are denoted by the same reference numerals, and the explanation of the structure of the same parts will be omitted. FIG. 3 shows a plan view. The rectangular first long slot 13 of the timing lever 12 is formed with its longitudinal direction being substantially the radial direction of the timing lever 12, and a straight line connecting the outer circumferential end and the inner circumferential end of the longitudinal wall surface is defined by the shaft. With respect to a straight line parallel to the straight line connecting the center of the rod 1 and the center of the first rod 9 and passing through the inner end, the outer end is inclined by an angle α in a direction away from the front in the rotational direction.

On the other hand, the rectangular second long slot 14 of the timing lever 12 has its longitudinal direction aligned with the timing lever 12.
The straight line connecting the outer peripheral end and the inner peripheral end of the longitudinal wall surface is parallel to the straight line connecting the center of the shaft 1 and the center of the second rod 10, and For a straight line passing through the end,
Angle β in the direction in which the outer peripheral end moves away from the rear in the rotational direction.
, and is asymmetrical to the first slotted hole 13 .

Also, when the engine is stopped, the first
The loosely fitted position of the rod 9 in the first slotted hole 13 is parallel to a straight line perpendicular to the rear longitudinal wall surface (point P) in the rotational direction of the first slotted hole 13 with which the first rod 9 is in contact. 9, an extension of a straight line touching the outer peripheral surface of the shaft 1 side intersects the weight support shaft 2, and the intersection of the extension line and a straight line passing through the center of the weight support shaft 2 and perpendicular to the extension line, and the perpendicular straight line. This is the position where the distance from the point on the outer peripheral surface of the weight support shaft 2 is ΔL. In addition to the above conditions, when the engine is stopped, the loosely fitted position of the first rod 9 in the first slotted hole 13 is determined by the outer circumferential surface of the first rod 9 and the inner wall of the rectangular first slotted hole 13 ( A gap G is provided between the outer circumferential surface of the first rod 9 and the first slotted hole 1 (the side closer to the shaft 1 among the widthwise wall surfaces).
A gap g is formed between the front longitudinal wall surfaces of No. 3 in the rotational direction, and is in contact with the rear longitudinal wall surface in the rotational direction at a point P.

To explain its operation in the above structure, when the rotor shaft (including the not-shown distribution arm) 11, which has a relatively large moment of inertia, receives an acceleration whose angular acceleration becomes negative before the top dead center, the timing lever The force Fa acting through the first rod 9 from the first long slot 13 of 12 acts at a distance a of the arm from the center of the weight support shaft 2. On the other hand, on the second long slot 14 side, the force Fb acts at a position at arm length b. It is clear that the moment of Fa·a is smaller than the moment of F·l in FIG. That is, at low engine speed (first
When the rod 9 is near the position when the engine is stopped, the center line of the force Fa acting on the first weight 7 from the timing lever 12 via the first rod 9 is 0.5d-ΔL from the surface of the weight support shaft 2. (When 0.5d<ΔL, the center line of force Fa is inside the surface of weight support shaft 2), and the force
Fa causes the first weight 7 to rotate around the weight support shaft 2, and at the same time presses the first weight 7 against the weight support shaft 2 to reduce the frictional force between the first weight 7 and the weight support shaft 2. enhance Therefore, the rotation (jump) of the first weight 7 due to the force Fa acting on the first weight 7 from the timing lever 12 via the first rod 9 is suppressed, and the angular acceleration when the engine rotates at low speed is reduced to just before top dead center. Over-advancing due to changes in angular acceleration when the value becomes negative is prevented.

Furthermore, even if the angular acceleration becomes negative before the top dead center of the piston when the engine is rotating at low speed, the timing lever (and rotor shaft) rotates due to inertia, and the first rod is pushed by the timing lever.
Since there is a gap g between the first rod and the longitudinal wall surface on the rotational direction side of the first slotted hole, the first rod pushed by the timing lever touches the longitudinal wall surface on the rotational direction side of the first slotted hole. The timing lever rotates upon contact with the rotor shaft 11.
rotation can be avoided.

In a conventional governor advance device, when the lever is at rest, each rod is in contact with the shaft-side wall of the two long slot holes in the timing lever, but in reality, each rod in the governor advance device Due to dimensional variations in the parts, the first rod 9 may come into contact with the first long slot, or the second rod 10 may come into contact with the second slot.
The position of the first rod was unstable in a stationary state due to contact in the long slot, which caused overadvance. By providing the gap G, in a stationary state, when the first weight is attracted by the first spring 15, the timing lever 12
rotates clockwise, and the second rod 10 always comes into contact with the wall of the slotted hole before the first rod 9, so that the position of the timing lever 12 is stably determined.

In FIG. 3, the first and second slotted holes 1
3 and 14 are shown asymmetrically, it goes without saying that β may have the same direction and angle as α.
However, both the first long slot 13 and the second long slot 14 are α
When the value is set to , the curvature of the characteristic increases as shown by the broken line in FIG. 4, where the horizontal axis represents the engine speed and the vertical axis represents the ignition advance angle. Further, there is a drawback that hysteresis, which causes a delay when the curve D returns, increases. Therefore, in general, when α≠β often fluctuates in rotation, that is, when the above-mentioned angular acceleration becomes negative before the top dead center, the overadvance angle suppression effect is determined on the first slotted hole 13 side. There is no difference. In addition, if the engine torque fluctuation is small, the first and second weights 7 and 8 will be able to fly at the conventional level due to the centrifugal force f even if the first and second slotted holes 13 and 14 of the timing lever 12 are asymmetrical. be exposed.
It is better if the length a of the arm on which the force Fa acts is smaller than the radius of the weight support shaft 2, so that on the second long slot 14 side, the second rod 10 contacts at point Q on the inner wall side in the rotational direction. It's getting old.

As described above, the governor advance device of this embodiment is formed such that the longitudinal wall of the first slotted hole is inclined at an angle α toward the rotational direction, and the first rod 9 and the weight support shaft 2 are connected to each other when the engine is stopped. 1st rod 9 in state
An extension line of a straight line that is parallel to a straight line perpendicular to the rear longitudinal wall surface (point P) of the first long slot 13 in the rotational direction and that is in contact with the outer circumferential surface of the first rod 9 on the shaft 1 side intersects the weight support shaft 2. arranged so that
The first rod is loosely fitted in a position where a gap g is formed between the first rod and the front wall in the direction of shaft rotation among the longitudinal wall surfaces of the first slotted hole when the engine is stopped. This prevents over-advancement caused by torque fluctuations that tend to occur at low engine speeds.

Figure 5 shows another embodiment, and this embodiment aims to bring the dotted line in Figure 4 close to the solid line and to avoid imbalance when both weights jump to their maximum. be. Therefore, the maximum radius from the center of the shaft 1 to the center of gravity of the first and second weights is the same, and the second long slot 14 is formed in the direction of inclination of the first long slot 13 in the circumferential direction. On the contrary, it is tilted in the counter-rotation direction, and further,
The angle γ _a formed by the straight line connecting the center of the shaft 1 and the center of the weight support shaft 2 of the first weight 7 and the straight line connecting the center of the weight support shaft 2 and the center of 9 of the first rod, the center of the shaft 1, and the weight The relationship between the straight line connecting the centers of the support shaft 3 and the straight line connecting the centers of the weight support shaft 3 and the center of the second rod 10 with the helix angle γ _b is set to satisfy γ _a <γ _b . Since the second long slot 14 is inclined in the opposite direction to the circumferential direction of the first long slot 13, γ _b is formed large, and the timing lever The rotation angle of 12 is increased. The large rotation angle of the timing lever 12 causes the dotted line in FIG. 4 to approach the solid line. Note that the timing lever operation by the second rod 10 is from point B, and from point A.
.about.B, the first spring 15 corresponds to the tension of both weights and acts in the direction of the solid line. This embodiment also brings the dotted line in FIG. 4 closer to the solid line, and has the same effects as the above-mentioned embodiments, in addition to being able to prevent the weight from being unbalanced at the time of maximum jump.

〔Effect of the invention〕

As described above, according to the governor advance device of the present invention, it is possible to suppress the jump of the first weight caused by the inertia of the timing lever due to torque fluctuations that tend to occur when the engine is running at low speed. Overadvanced angle due to torque fluctuations is prevented.

[Brief explanation of drawings]

Figure 1 is a plan view of a conventional governor advance device;
3 is a plan view of an embodiment of the governor advance device of the present invention, FIG. 4 is an explanatory diagram of the advance angle characteristic of the device shown in FIG. 3, and FIG. FIG. 7 is a plan view of another embodiment of the governor advance device of the present invention. 1...Shaft, 2, 3...Weight spindle, 6
...Weight mounting base, 7...First weight, 8...
...Second weight, 9...First rod, 10...Second rod, 11...Rotor shaft, 12...Timing lever, 13...First slotted hole, 14...
Second long slot, 15... First spring, 16...
Second spring, G, g...Gap, γ _a , γ _b ...
...Angle, α...Inclination angle, D...Advance angle curve, A...Start point, B...Point.

Claims (1)

[Scope of Claims] 1. Two weight spindles installed around the shaft axis on a weight mounting base fixed to a shaft driven by a reciprocating engine, and one end side of each of the weight spindles. The first rod is rotatably supported, and the first and second rods are respectively planted on the other end side.
A weight and a second weight, one end of which is connected to the first weight and the other end of which is connected to the weight mounting base, and a tensile force is applied between the two connection points from the starting point of zero advance of the rotation speed-ignition advance curve. a first spring having one end connected to the second weight and the other end connected to the weight mount so as to work together with the first spring to apply a tensile force between the two connection points. The second spring is fixed to the rotor shaft that is loosely fitted to the shaft, and has a first elongated slot hole and a second elongated slot hole that are opened with the longitudinal direction being substantially radial. In the governor advance device, a timing lever is provided in which the first and second rods are slidably and loosely fitted into the longitudinal wall surfaces of the first and second slotted holes, respectively, and the first weight. The weight support shaft is parallel to a straight line that passes through the center of the first rod near the engine stop state and is perpendicular to the rear wall in the shaft rotational direction of the longitudinal wall of the first slot. The first rod is disposed on an extension of a straight line that is in contact with the shaft-side outer peripheral surface of the first rod, and the position in the first slot into which the first rod is loosely fitted is the same as that of the first rod when the engine is stopped. A gap g is formed between the longitudinal wall surfaces of the first long slot on the front side in the direction of shaft rotation.
The second spring is formed so as to apply a tensile force between the two connection points from an intermediate point of the rotation speed-ignition advance angle curve; The radius from the center of the shaft to the center of gravity of the first and second weights is the same in the maximum flying state, and the center of the shaft and the center of the weight support shaft that supports the first weight The angle _r a made by the straight line connecting the weight support shaft with the straight line connecting the center of the weight support shaft and the center of the first rod, and the straight line connecting the center of the shaft and the center of the weight support shaft that pivotally supports the second weight. The relationship between the angle r _b formed by the straight line connecting the center of the weight support shaft and the center of the second rod is r _a
<r _b , and the straight line connecting the outer peripheral end and the inner peripheral end of the longitudinal wall surface of the first slotted hole is parallel to the straight line connecting the center of the shaft and the center of the first rod, and The outer circumference end is inclined in a direction away from the front in the rotational direction with respect to the straight line passing through the inner circumference side end, and the straight line connecting the outer circumference side end and the inner circumference side end of the longitudinal wall surface of the second long slot is A governor characterized in that an outer peripheral end is inclined in a direction away from the rear in the rotational direction with respect to a straight line that is parallel to a straight line connecting the center of the shaft and the center of the first rod and passes through the inner peripheral end. Advance angle device.