JPH0692745B2 - Governor for internal combustion engine - Google Patents

Description

The present invention relates to a governor used in an internal combustion engine such as a diesel engine.

(Prior Art) Generally, a governor of a diesel engine transmits a centrifugal force of a governor weight to a governor lever mechanism, and the governor lever mechanism controls the position of a control rack of a fuel injection pump.

(Problems to be solved by the invention) However, in the conventional structure, since the temperature in the combustion chamber is low at the time of idling immediately after the start, especially in the cold state (when the temperature of the engine body is low), the combustion state Is incompletely burned, and as a result, the exhaust gas is emitted as bluish white smoke, which causes irritation to the eyes and nose.

(Means for Solving Problems) According to the present invention, a regulator lever shaft 22 having a regulator lever 25 fixed to the outside of the governor casing 8 is fitted to the outer periphery of the regulator lever shaft 22, and the governor casing 8 has a first portion for adjusting the idle speed. The first lever 33 is also supported on the governor casing 8 via a tubular portion 40 each having a second lever 41 for adjusting the idle speed outside the governor casing 8, and the tip of the first lever 33 is attached to the regulator lever shaft 22. It is sandwiched between the movable pin 37 of the thermostat 32 and the compression coil spring 35 which are orthogonal to and fixed in the governor casing 8, screwed into the bent portion 42 at the tip of the second lever 41, and fixed by the lock nut 47. Insert the screw 46 into the bent portion 45 of the tip of the protruding portion 25a that faces away from the body of the regulator lever 25.
The contact is made from the idling position restriction side of No. 2, and the regulator lever 25 is moved from the high speed idling position Q side to the low speed idling position P side by the thermostat movable pin 37 protruding in response to the rise of the engine temperature. Is a governor for an internal combustion engine.

(Embodiment) FIG. 1 is a schematic sectional view of an embodiment, FIG. 2 is a sectional view taken along the line II-II in FIG. 1, and FIG. 3 is a partial view taken along the line III-III in FIG. In FIG. 1, for example, three fuel injection pump elements 2 are attached to the upper half of the pump casing 1. A pump cam shaft 5 that drives the plunger 3 of each fuel injection pump element 2 is supported by a lower portion of the pump casing 1 via a bearing 6.

A casing 8 of a governor 7 is fixed to the pump casing 1, and an end portion of the pump cam shaft 5 projects into the casing 8. A governor weight 9 is attached to the protruding end of the pump cam shaft 5, and the movement of the governor weight 9 due to centrifugal force is transmitted to the lower end of the lever 11 via the sleeve 10. The lower end of the lever 11 is biased by the lower end of another lever 12 via the spring mechanism 13 from the side opposite to the sleeve 10.

The lever 11 has an intermediate portion supported by a shaft 15 via a bush, and an upper end portion connected to a control rack 17 via a link 16. The control rack 17 meshes with the control sleeve 18 of the fuel injection pump element 2. When the lever 11 moves the control rack 17 via the link 16, the control sleeve 18 rotates and the fuel of the fuel injection pump element 2 is rotated. The injection quantity changes.

An intermediate portion of the lever 12 is supported by the shaft 15, and the above portion is connected to the tip of the lever 21 via a tension coil spring 20. The base end of the lever 21 is a shaft 22 parallel to the shaft 15.
It is fixed at one end. A regulator lever 25 (only the center line is shown in FIG. 1) is connected to the other end of the shaft 22. The tip of the regulator lever 25 is connected to an operating mechanism through a mechanism (not shown). When the regulator lever 25 is rotated by the operating mechanism, the shaft 22, the lever 2
1. The lever 12 is rotated via the spring 20 and the lever 11 is rotated via the spring mechanism 13 to change the position of the control rack 17, that is, the fuel injection amount, as described above.

The basic structure described above is the same as that of the conventional product, but in the present invention, the following structure is adopted in addition to the above structure.

That is, the governor 7 includes a lever mechanism 30 and a spring mechanism.
31 and thermostat 32 are provided. The lever mechanism 30 is provided by using the shaft 22 and includes a lever 33 extending downward from the shaft 22. The spring mechanism 31 is composed of a compression coil spring 35 and a pin 36 fixed to the tip thereof, and the entire spring mechanism extends above the governor weight 9 in parallel with the pump cam shaft 5. The base end portion of the spring 35 is fitted and fixed in a hole provided in the end wall boss portion of the pump casing 1, and the pin 36 at the tip of the spring 35 abuts the lower end portion of the lever 33 from the pump casing 1 side. . The thermostat 32 is fitted and fixed in the recess of the end wall boss portion of the governor casing 8, and has a movable pin 37 (movable portion) that abuts the lower end of the lever 33 from the side opposite to the pin 36. Pin 37
Is projected from the main body of the thermostat 32 in parallel with the pump cam shaft 5, and when the thermostat 32 detects a change in ambient temperature, the protruding position of the pin 37 is changed.

Oil (system oil) common to the engine body is supplied to the inside of the pump casing 1 and the governor casing 8 from an oil pump (not shown). Therefore, the temperature of the engine body and the parts of the governor 7 are The temperatures generally correspond. Therefore, when the temperature of the engine body is low, the temperature detected by the thermostat 32 is also low, and as a result, the protrusion amount of the pin 37 is small, and the lever 33 is pushed by the spring 35 to occupy the position shown in the figure. When the temperature of the engine body rises, the temperature detected by the thermostat 32 also rises, and as a result, the pin 37 projects and pushes the lever 33 toward the pump casing 1.

In FIG. 2, the lever mechanism 30 includes a tubular portion 40 rotatably supported in the hole of the boss portion of the governor casing 8. The lever 33 is provided at the end of the tubular portion 40 on the inner side of the casing. One end of a lever 41 is attached to the outer periphery of the end of the tubular portion 40 on the outside of the casing. Although not clearly shown, a flat notch is provided on the outer periphery of the end of the tubular portion 40, and the lever 41 utilizes the notch to make the tubular portion 40
It is non-rotatably fitted to. The lever 41 projects upward from the tubular portion 40, and is lateral (upside the tubular portion 40) at the upper part.
There is a flat fold 42 which projects out to. The lever 41 may be provided integrally with the tubular portion 40.

The shaft 22 is rotatably fitted to the inner periphery of the tubular portion 40,
Both ends project from the tubular portion 40. A male screw is provided on the end portion 43 of the shaft 22 on the outer side of the casing, and the regulator lever 25 is fixed to the end portion 43 by a nut 44 attached to the male screw. Further, flat notches are provided at two locations on the outer peripheral surface of the end portion 43, and the lever 225 is non-rotatably fitted into the notches.

In FIG. 3, the regulator lever 25 is also a lever 41.
Extending upward from shaft 22 to the same height as
It has a flat bent portion 45 facing to the upper end.
A screw 46 is screwed into the screw hole of the portion 42 and is fixed by a lock nut 47. The screw 46 projects toward the portion 45, and when the lever 41 rotates as described later, the screw 46 pushes the regulator lever 25.

In the vicinity of the governor casing 8, the pump casing 1
An idle adjusting bolt 48 is fixed to the outward flange of the so as to adjust the protrusion amount by using a lock nut. The bolt 48 projects toward the bottom of the regulator lever 25.

In FIG. 3, an arrow M indicates the rotation direction of the regulator lever 25 when increasing the rotation speed. The position P indicated by the chain double-dashed line is the position of the regulator lever 25 when the rotation speed is the lowest, and the regulator lever 25 is in contact with the bolt 48 at this position P. A position Q indicated by a solid line, which is slightly moved from the minimum rotation position P in the speed increasing direction M, is a position of the regulator lever 25 suitable for idling in the cold state.
The position R indicated by the one-dot chain line is the position of the regulator lever 25 when the rotation speed is maximized.

The lever 41 operates at the position q indicated by a solid line in response to an increase in engine temperature by the action of the thermostat 32 (FIG. 1).
To the position p indicated by the one-dot chain line in the arrow s direction, and the regulator lever 25 moves from the position Q to the position P in accordance with the rotation. Further, the relative position of the regulator lever 25 with respect to the lever 41 can be finely adjusted by changing the protruding amount of the screw 46.

According to the above configuration, in the idling operation in the cold state, the lever 41 and the regulator lever 25 are at the positions q and Q, respectively.
Occupies (high-speed idling position). Therefore, the engine speed also increases. Therefore, the combustion state becomes a complete combustion state, and the generation of bluish white smoke is prevented.

Although the engine temperature rises as the idling operation continues, the lever 41 and the regulator lever 25 move to the positions p and P (low speed idling position) side accordingly, and the rotation speed decreases. Therefore, the engine speed is maintained at a predetermined minimum value.

As described above, according to the present invention, the thermostat 32
Since the position of the regulator lever 25 in the idling state is adjusted by the lever mechanism 30 that is linked to the engine speed, the rotation speed is adjusted according to the engine temperature to maintain the optimum idling operation state in both the cold state and the warm state. can do. Also, since the thermostat 32 is adopted as the control mechanism of the lever mechanism 30, the structure is simplified,
A large increase in manufacturing cost can be prevented.

Further, according to the present invention, the regulator lever shaft 22 and the tubular portion
Since 40 is arranged inside and outside on the same axis, the number of partial points is small and the cost is low, and the high-speed idling position Q and the low-speed idling position P can be optimized and easily by the thermostat movable pin 37 and the adjusting screw 46. Can be adjusted. Since the first lever 33 is held by the thermostat movable pin 37 and the compression coil spring 35,
Accurate movement of the thermostat movable pin 37 2nd lever 41
Can be communicated to and the operation will be reliable.

[Brief description of drawings]

1 is a schematic sectional view of the embodiment, FIG. 2 is a sectional view taken along the line II-II in FIG. 1, and FIG. 3 is a partial view taken along the line III-III in FIG. 7
...... Governor, 25 …… Regulator lever, 30 …… Lever mechanism, 32 …… Thermostat, 37 …… Pin (moving part),
P, p ... low speed idling position, Q, q ... high speed idling position

Claims (1)

[Claims] 1. A regulator lever shaft 22 having a regulator lever 25 fixed to the outside of a governor casing 8 is fitted to the outer periphery thereof, and a first lever 33 for adjusting the idle speed is provided inside the governor casing 8 and outside the governor casing 8. Is supported by the governor casing 8 via the tubular portions 40 each having a second lever 41 for adjusting the idle speed, and the tip end of the first lever 33 is orthogonal to the regulator lever shaft 22 and fixed in the governor casing 8. It is sandwiched between the movable pin 37 of the thermostat 32 and the compression coil spring 35, and screwed to the bent portion 42 at the tip of the second lever 41 and fixed with the lock nut 47 to the body of the regulator lever 25. Insert the regulator lever 2 into the bent portion 45 of the tip of the protruding portion 25a to the opposite side.
The regulator lever 25 is moved from the high-speed idling position Q side to the low-speed idling position P side by the thermostat movable pin 37 which is brought into contact with the idling position regulation side of 5 and protrudes in response to the rise of the engine temperature. A governor for internal combustion engines that features.