JPS58206830A - Speed governor of internal-combustion engine - Google Patents

Abstract

PURPOSE:To increase the idle revolution only in the cooling mode operation of an engine to improve the combustion characteristic by providing in series springs which operate at the temperature of the lubricating oil of the engine, with respect to the springs capable of stabilizing the internal-combustion engine at an idling state and made from a configuration memory alloy. CONSTITUTION:The governor comprises an idle spring 8 capable of operating only when the internal-combustion engine is idling to thereby stabilize the internal-combustion engine to the idling state. In this case, in a casing 7 provided with the above spring 8, is provided a spring 21 made from a configuration memory alloy with respect to the above spring 8 through a spring seat 20A of a pump rod 20 with a spring seat. In the cooling made operation of the internal- combustion engine, only the idle spring 8 is caused to act in the direction of increasing the quantity to increase the idling revolution. On the other hand, in the warming mode operation, the spring 21 made from the configuration memory alloy is caused to act in the direction of decreasing the quantity to decrease the idling revolution.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a speed governor for an internal combustion engine.

Conventionally, a speed governor having an idle spring that operates only when an internal combustion engine is idling to stabilize the engine in an idling state is exemplified in the invention of Utility Model Publication No. 46-36330 as a mechanical governor for a diesel engine.

However, with this speed governor, the idle speed is constant regardless of the internal combustion engine temperature, so there is a lot of horsepower loss during idling operation when the engine is cold, and therefore the fuel injection amount is also large, and the engine speed enters the abnormal injection region. Fluctuations occur.

In addition, the lower the engine temperature and the lower the engine speed, the more unburned components in the exhaust gas, making it difficult to warm up the engine quickly while the engine speed remains low.

Therefore, the present invention reduces unburned components when the engine is cold by increasing the idle speed only when the engine is cold.
This was done to avoid abnormal injection.

That is, the present invention provides a speed governor having an idle spring that operates only when an internal combustion engine is idling and can stabilize the internal combustion engine in an idling state. It is constructed by installing shape memory alloy springs in series that act at the lubricating oil temperature of the internal combustion engine.

An embodiment of the present invention will be described below with reference to the drawings, and FIG. 1 is a schematic explanatory diagram of a speed governor in an embodiment of the present invention;
FIG. 2 is an enlarged side sectional view of a main part of the governor spring section of FIG. 1.

First, a tension lever 4, which has a governor spring 6 attached between an externally operable control lever <-1 and a swivel lever 2 that moves together, is movable in a pendulum shape using a pin 5 as a fulcrum. Angleich spring 6 is installed.

Here, the idle spring 8 facing the back side of the tension lever 4 provided on the casing 7 side operates only when the engine is idling, and stabilizes the engine in an idling state.

Next, a guide lever 10 is attached to the pin 5 and swings in a pendulum shape using the pin 5 as a fulcrum, and the guide lever 10 supports the intermediate point of the 70-ching lever 11 at its intermediate position.

The floating lever 11 is connected to a control rack 16 of a fuel injection pump via a link 12, and swings about a pin 14 as a fulcrum.

The control rack 16 is assumed to slide in the left direction in FIG. 1 as the full fuel supply direction and in the right direction as the fuel stop direction.

A weak start spring 15 is installed between the upper end of the floating lever 11 and the casing 7, which acts in a direction to tilt the floating lever 11 to the left in the figure.

The shifter 18 moves according to the opening of a balance weight 17 attached to a shaft 16 connected to the crankshaft of the internal combustion engine.
It is attached to the lower end of the guide lever 10, and its rear end faces the Angleich spring 6 at the lower end of the tension lever 4.

The front edge of the lower end of the tension lever 4 is brought into contact with a full-rotation lever 19 whose position is freely adjustable, thereby limiting the maximum swing of the tension lever 4 to the left in the figure.

Next, the casing 7 provided with the idle spring 8
As shown in Fig. 2, there is a bush with a spring seat for the idle spring 8. Spring seat 20 of rod 20
A spring 21 made of a shape memory alloy is provided in series through A, guides this bushing rod 20 with a spring seat, and is also held down by a holding bolt 22 screwed onto the casing 7.

This shape memory alloy spring 21 returns to its original spring shape when warm and presses down the idle spring 8 via the spring seat 20, but when cold, it easily deforms and no longer functions as a spring. have.

Therefore, as shown in FIG. 2, at a cold temperature below the transformation point of the spring 21, only the idle spring 8 acts as shown by the increasing arrow, increasing the idle speed of the internal combustion engine; At warm temperatures, the shape memory alloy spring 21 acts in the direction of the arrow to press down on the idle spring 8, so the idle rotation is reduced.

Note that the humidity of this spring 21 is determined by the temperature of the engine lubricating oil.

By providing the speed governor configured as above,
The idle speed increases by -L only when the engine is cold, and the fuel injection amount per stroke and engine speed n (・rpm
) It is possible to avoid the abnormal injection region as shown in the diagrams at no-load cooling state and no-load cooling state, which shows the relationship between It is possible to eliminate the emission and consumption of unburned components during the cold state, which is also evident in the diagram shown.

Therefore, by applying the present invention, the idle speed increases when the engine is cold, and the idle speed decreases as the engine warms up, thereby reducing white smoke emissions when the engine is cold and quickly warming up the engine. It has the effect of being able to

[Brief explanation of drawings]

Fig. 1 is a schematic explanatory diagram of a speed governor in an embodiment of the present invention, Fig. 2 is an enlarged side sectional view of the main part of the governor spring section in Fig. 1, and Fig. 3 is the amount of fuel injected per stroke. Figure 4 is a diagram showing the relationship between engine speed n, (rpm) during no-load cold state and no-load cold state, and Figure 4 is a diagram showing the relationship between diesel blue-white smoke and engine speed. . 1... Control lever, 4... Tension lever, 7... Casing, 8... Idle spring, 15... Control rack, 17... Balance weight, 20... Bush rod with spring seat, 2
QA...Spring seat, 21...Spring, 22...
Hold down bolt. Agent Patent Attorney Makoto Ogawa - Patent Attorney Masaru Noguchi Patent Attorney Kazuhiko Saishita 3 Shi I Figure 1 Figure 2 22 20A 4th Blade Engine rotation speed n (r

Claims (1)

[Claims] In a speed governor having an idle spring that operates only when the internal combustion engine is idling to stabilize the internal combustion engine in an idling state, the internal combustion engine A speed governor for an internal combustion engine, characterized by having shape memory alloy springs installed in series that act at the temperature of lubricating oil.