JPH0972223A - Centrifugal governor of diesel engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To satisfy the starting properties of an engine on a slope, prevent speed variation when the engine is inclined, and prevent the excessiveness and shortage of fuel at rapid starting time and rapid stopping time, by regulating disturbance generated in a centrifugal governor when an on-vehicle engine is inclined, rapidly started and stopped. SOLUTION: The rack pin 5 of a fuel injection pump 6 is formed to be pushed and pressed on a fuel quantity reducing side by the governor force G of a governor weight 18 so as to be elastically pressed on a fuel quantity increasing side R by a governor spring 8 through a governor lever 1. A reservoir 12 for lubricant oil 11 is formed in the lower part of the pump storing chamber 10 of the fuel injection pump 6, and a balancer 13 having an eccentric load part 13a is dipped and vertically swingably arranged in the reversed lubricant oil 11. This balancer 13 and the neighborhood of the swinging base end of the governor lever 1 are connected together interlockingly through a buffer spring 14 so that the disturbance swing of the governor lever 1 is regulated through the buffer spring 14 by the self-retaining attitude of the balancer 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centrifugal governor for a diesel engine, and more particularly to suppressing engine start-up failures and fluctuations in rotation speed on slopes, and to prevent disturbance occurring in the centrifugal governor during sudden start or sudden stop. Regarding the technology to regulate.

[0002]

2. Description of the Related Art As a conventional centrifugal governor for a diesel engine, Japanese Patent Application Laid-Open No. 7-13393 proposed by the present applicant.
The one disclosed in Japanese Patent Publication No. 74 is known. that is,
For example, as shown in FIG. 2, the inverted L-shaped first lever 1a is attached to the rack pin 5 of the fuel injection pump 6 of the diesel engine.
The starter spring 2 and the governor weight 18 are interlockingly connected to each other, and the speed adjusting lever 7 is connected to the inverted L-shaped second lever 1b via the governor spring 8 to adjust the tension of the governor spring 8 to the speed adjusting lever 7 The second lever 1b can be received by the fuel limiter 9 at the full load position (4/4).

While the rack pin 5 is elastically pressed toward the fuel increase side R by the governor spring 8 and the start spring 2 via the first lever 1a and the second lever 1b in this order, the governor force G of the governor weight 18 is exerted. And the first lever 1a
It is pressed to the fuel amount reduction side L via. Torque booster 3
Is interposed between the first lever 1a and the second lever 1b. This centrifugal governor works as follows.

At the time of starting the engine, the tension of the start spring 2 causes the rack pin 5 to move through the first lever 1a.
To the start increasing position (S _T ). In the rated load operation state, the rack pin 5 is moved to the unloaded position (0) via the second lever 1b and the first lever 1a by the balance force between the governor spring 8 and the start spring 2 and the governor force G opposed thereto. / 4) and full load position (4/4)
Adjust the amount within the adjustment range between and.

When the engine shifts to overload operation, the engine speed decreases, the governor force G decreases, and the tension of the governor spring 8 causes the first lever 1a and the second lever 1b to move.
And are pulled to the fuel increase side R. At this time, the second lever 1b comes into contact with the fuel limiter 9 and stops, but the torque-increasing device 3 moves the rack pin 5 to the full load position (4/4) via the first lever 1a and to the amount increasing side. By adjusting the amount within the adjusting range with the torque-up position (T _U ), the engine increases torque and exhibits tenacity.

[0006]

Particularly in a centrifugal governor for a vehicle-mounted engine, engine start failure or speed fluctuation occurs on a slope, and excessive fuel is supplied at the time of sudden start or sudden stop, or fuel is not supplied. There will be a shortage. This is for the following reasons. When the vehicle-mounted engine is in a rearwardly inclined posture (upwardly forward) on a slope, a large counterclockwise rotational moment acts on the inverted L-shaped governor lever 1.
On the other hand, since the tension of the start spring 2 is relatively weak,
When a large counterclockwise rotation moment acts on the governor lever 1, the rack pin 5 does not reach the start increasing position (S _T ) and therefore it becomes difficult to start the engine.

When a large rotational moment acts on the inverted L-shaped governor lever 1, the governor lever 1 largely overshoots toward the fuel increase side or the fuel decrease side depending on the inclination direction, so that the engine speed fluctuates.
Further, even when the vehicle suddenly starts or suddenly stops, a large rotational moment due to a disturbance acts on the inverted L-shaped governor lever 1 and the governor lever 1 largely overshoots, or excessive fuel is supplied, or However, there is a problem that fuel shortage occurs.

The present invention takes such a situation into consideration, and restricts the disturbance that occurs in the centrifugal governor when the vehicle-mounted engine is tilted or suddenly starts / stops, thereby improving the startability of the engine on a slope. The technical issues are to make it good, to prevent speed fluctuations when the engine is tilted, and to prevent excess or deficiency of fuel when suddenly starting or stopping.

[0009]

In order to achieve the above object, the present invention is configured as follows. That is, the governor weight 18 is interlockingly connected to the rack pin 5 of the fuel injection pump 6 of the diesel engine via the inverted L-shaped governor lever 1, and the governor lever 1 is connected to the speed control lever 7 via the governor spring 8. The tension of the governor spring 8 can be adjusted by the speed adjusting lever 7, and the rack pin 5 is elastically pressed by the governor spring 8 toward the fuel increase side R, while the governor force G of the governor weight 18 reduces the fuel decrease side. In a centrifugal governor of a diesel engine configured to press to L, a reservoir 12 for lubricating oil 11 is provided in a lower portion of a pump accommodating chamber 10 of the fuel injection pump 6, and an eccentric load portion is provided in the stored lubricating oil 11. The balancer 13 having 13a is soaked as to be vertically swingable, and the balancer 13 and the governor lever are provided. 1 is interlockingly connected to the swinging proximal end portion 1c of the governor lever 1 via a buffer spring 14, and the disturbance swinging of the governor lever 1 is restricted by the self-holding posture of the balancer 13 via the buffer spring 14. , Is characterized.

[0010]

The action and effect of the invention The centrifugal type governor of the present invention has the following action and effect. For example, in FIG. 1, a large counterclockwise rotational moment acts on the inverted L-shaped governor lever 1 when the engine is in the rearwardly inclined posture (upwardly forward). At this time, the balancer 13 has the eccentric load portion 13
Since it has a, it swings clockwise with respect to its spindle so as to maintain its non-inclined posture in the lubricating oil 11 stored in the reservoir 12, and the balancer 13 rotates clockwise. Moment acts. On the other hand, the balancer 13 and the swinging proximal end portion 1c of the governor lever 1 are interlocked and coupled via a buffer spring 14, and the disturbance swinging of the governor lever 1 is prevented by the self-holding posture of the balancer 13. Regulate through. This produces the following effects.

(A) The rack pin 5 is surely pressed by the governor lever 1 to the starting increase position (S _T ) and the starting performance of the engine on a slope can be improved. (B) Further, the disturbance swing of the governor lever 1 when the engine is tilted can be restricted by the self-holding posture of the balancer 13, so that the speed variation can be prevented from occurring due to the overshoot of the governor lever 1. (C) Furthermore, even when the vehicle suddenly starts or stops, the disturbance swing of the governor lever 1 is similarly restricted by the self-holding posture of the balancer 13 to prevent the governor lever 1 from overshooting and causing an excess or deficiency of fuel. can do.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical sectional view of a centrifugal governor of a diesel engine according to an embodiment of the present invention. This centrifugal governor has the same basic structure as the conventional example of FIG. That is, the governor weight 18 is attached to the rack pin 5 of the fuel injection pump of the diesel engine via the first lever 1a.
And one end of the start spring 2 are interlockingly connected. Further, the speed adjusting lever 7 is connected to the second lever 1b via the governor spring 8 so that the tension of the governor spring 8 can be adjusted by the speed adjusting lever 7.

That is, the start pin 2 and the governor spring 8 elastically press the rack pin 5 toward the fuel amount increasing side R, while the governor force G of the governor weight 18 causes the rack pin 5 to decrease the fuel amount side through the first lever 1a. L
It is configured to press. In addition, the second lever 1b
Is configured to be restricted to the full load position (4/4) by the fuel limiter 9, and the torque up device 3 is configured to be interposed between the first lever 1a and the second lever 1b.

The characteristic structure of the present invention will be described below. As shown in FIG. 1, a reservoir 12 for lubricating oil 11 is provided in a lower portion of a pump housing chamber 10 of a fuel injection pump 6, and a circular balancer 1 is provided in the lubricating oil 11 stored in the reservoir 12.
3 is dipped and pivotally supported by the support member 15 and the support shaft 16 so as to be swingable. The circular balancer 13 is provided with an eccentric load portion 13a, and the position of the center of gravity W due to the eccentric load portion 13a is always on the vertical line so that the balancer 13 can maintain its non-inclined posture.

The balancer 13 and the swinging proximal end portion 1c of the first lever 1a are interlockingly connected via a buffer spring 14. That is, even when a large rotational moment due to a disturbance acts on the governor lever 1 of the centrifugal governor when the vehicle-mounted engine is tilted or suddenly starts / stops suddenly, the balancer 13 always maintains its non-tilted attitude. The rocking of the governor lever 1 is controlled by the buffer spring 14.

As shown in FIG. 1, the locking hole 1d of the first lever 1a, to which one end of the buffer spring 14 is locked, is formed as a long hole. This has a slight rotational moment due to disturbance. Even if it acts on the governor lever 1, this is intended to be ignored if it is within the range of the long hole. Further, the balancer 13 is stored in the lubricating oil 11 stored in the storage section 12.
Was immersed in the vehicle-mounted engine when it leaned or suddenly started.
This is to prevent the balancer 13 from swinging excessively during a sudden stop.

With the above construction, the disturbance rotation moment acting on the governor lever 1 when the engine is tilted is regulated by the self-holding posture of the balancer 13, and the tension of the start spring 2 causes the rack pin 5 to start the increased position through the first lever 1a. It can be positioned at ( _ST ) to improve the engine startability on a slope. Further, even when the engine is inclined, it is possible to prevent the speed variation from occurring due to the overshoot of the governor lever 1. Furthermore, even when the vehicle suddenly starts or stops,
It is possible to prevent the disturbance swing acting on the governor lever 1 by the balancer 13 and prevent the governor lever 1 from overshooting and causing excess or deficiency of fuel.

In the normal rated load rotation range and overload rotation range, the operation is similar to that of the conventional example. That is, in the rated load rotation range, the first lever 1a and the second lever 1b are in close contact with each other via the torque-up device 3, and the balance of the governor force G against the governor spring 8 and the start spring 2 causes The rack pin 5 is positioned in the metering range between the no-load position (0/4) and the full-load position (4/4) via the lever 1a to maintain the engine at a constant rotation speed. In the overload rotation range, the first lever 1a moves to the fuel amount increasing side R by the action of the torque increasing device 3, and the rack pin 5 is moved between the full load position (4/4) and the torque increasing position (T _U ). Adjust within the adjustment range.

In the above embodiment, the two lever type governor lever is exemplified, but the same can be applied to the one type governor lever. In the above embodiment, the circular balancer is used, but the balancer is not limited to this as long as it controls the swing of the governor lever by the self-holding posture via the buffer spring.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a centrifugal governor according to an embodiment of the present invention.

FIG. 2 is a vertical sectional view of a centrifugal governor according to a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Governor lever, 1c ... The vicinity of the rocking base end of the governor lever, 5 ... Rack pin, 6 ... Fuel injection pump, 7 ... Governor lever, 8 ... Governor spring, 18 ... Governor weight,
DESCRIPTION OF SYMBOLS 10 ... Pump accommodation chamber, 11 ... Lubricating oil, 12 ... Lubricating oil storage part, 13 ... Balancer, 13a ... Eccentric load part, 14
... Buffer spring, 18 ... Governor weight, G ... Governor force, R
… Fuel increase side, L… Fuel decrease side.

Claims (1)

[Claims] 1. A governor weight (18) is interlockingly connected to a rack pin (5) of a fuel injection pump (6) of a diesel engine via an inverted L-shaped governor lever (1), and the governor lever (1) is governor. The governor spring (8) is connected via a spring (8) so that the tension of the governor spring (8) can be adjusted and operated by the governor spring (8), and the rack pin (5) is connected to the governor spring (8). In the centrifugal governor of the diesel engine configured to press the fuel amount side (R) by the pressure) to the fuel amount reduction side (L) by the governor force (G) of the governor weight (18). A reservoir (12) for the lubricating oil (11) is provided in the lower portion of the pump housing chamber (10) of the fuel injection pump (6), and an eccentric load portion (13a) is provided in the stored lubricating oil (11). Balancer with (13) is immersed in providing possible vertical swing, buffer spring swing base end vicinity portion and (1c) of the balancer (13) and said governor lever (1) (1
4) is interlocked and connected, and the disturbance swing of the governor lever (1) is configured to be restricted by the self-holding posture of the balancer (13) via the buffer spring (14). Centrifugal governor of diesel engine.