JPS5841228A - Boost compensator - Google Patents

Abstract

PURPOSE:To enable to control the setting force of a boost compensator and the full- rack position of a control rack of an injection pump independently from each other, by providing a manual lever for increasing fuel for starting an engine and a stopper for changing the full-rack position of the control rack such that they are operated in association with the control rack. CONSTITUTION:When a manual fuel increasing lever 14 is turned in the direction shown by an arrow in the drawing by depressing a button or the like for increasing fuel at the time of starting an engine, a fuel increassing spring 15b is contracted and a main lever 10 is turned. At the same time, a control rack 12 is moved from a full- rack position to a postion where it is held in contact with the lever 10 so as to supply fuel required for starting the engine. With increasing of the engine speed, the rack 12 is retracted in a fuel decreasing direction to meet with the engine speed, and the lever 14 is also brought back to its normal position, so that the full-rack position of the rack 12 is determined by the position of the lever 10. With further increasing of the engine speed, the boost pressure is raised and a member 5 operated in response to the boost pressure is displaced, so that a push rod 6 is moved in the direction shown by an arrow in the drawing and the lever 10 is turned in a clockwise direction. Resultantly, the rack 12 is moved in the fuel increasing direction beyond the full-rack position. Thus, it is enabled to supply a requied amount of fuel to the engine.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention is a fuel injection adjustment device for a diesel engine equipped with a supercharger, in which a control rack of a fuel injection pump should be stroked for supercharging in order to supply fuel commensurate with an excessive amount of fuel. This is related to the boost compensator.

In general, a boost compensator has a bushing rod on the diaphragm on which boost pressure acts, and the main lever that regulates the full rack position of the control rack engages with this push rod, and the boost compensator spring that counters the boost pressure is A setting force of one foot is applied, and when the boost pressure rises above a specified value, the diaphragm is displaced against the boost compensator spring, and the control rack is moved from the full rack position to the increasing direction. There is.

Therefore, in a fuel injection adjustment device having such a boost compensator, the main <- position gives the full rack position of the control rack when the diaphragm of the boost compensator is not displaced. Adjustment means is required to adjust both the full rack position and the set force of the boost compensator spring.

However, in the past, the adjustment means used was to change the position of the diaphragm using an adjustment screw provided to press the diaphragm. The setting force adjustment and the full rack position adjustment are performed at the same time, resulting in inaccurate and difficult adjustment.

Furthermore, as is well known, when starting a diesel engine, it is necessary to move the control rack of the fuel injection pump in the increasing direction past the full rack position to obtain a sufficient starting amount. If a compensator is provided, the main lever position of the boost compensator is regulated by the control rack, so in order to obtain an increase in starting power, it is necessary to rotate the main lever against the boost compensator spring that has been given a set force. This has the disadvantage that since the operating force increases, the capacity of the solenoid that applies the operating force also increases.

Therefore, in this invention, in order to rationally eliminate the above-mentioned drawbacks, a manual increase lever and a full rack position adjustment function are provided to obtain a starting increase on the side opposite to the control rack of the main lever pivotally connected to the bushing rod. A stopper for adjusting the full rack position is provided to sandwich the main lever, allowing adjustment of the set force of the boost compensator spring and adjustment of the full rack position of the control rack to be performed separately, as well as starting with a small operating force. It is an attempt to provide a boost compensator that can be increased.

Embodiments of the present invention will be described below with reference to the drawings.

1 and 2, a boost compensator main body 1 according to the present invention is attached to the governor G side of a fuel supply pump P, and a partition wall 2 formed in the main body 1 is connected to a boost pressure response chamber 3 and a main lever chamber. It is divided into 4.

The boost pressure responsive chamber 3 is further connected to the pressure chamber 3a and the spring chamber 3 by a pressure responsive member 5 made of, for example, a diaphragm.
The boost pressure is introduced into the pressure chamber 3a through the boost pressure introduction hole 17, and the pressure responsive member 5
It acts on This pressure responsive member 5 has a bushing rod 6.
One end of the bushing rod 6 and the main body 1 are fixed.
A boost compensator spring 7 disposed on the spring N3b is provided between the partition wall 2 and the boost pressure. The setting force of the boost compensator spring 7 can be changed by slightly moving the bushing rod 6 by rotating an adjusting screw 8.

The other end of the bushing rod 6 protrudes into the main lever chamber 4 through a through hole 9 formed in the partition wall 2 of the main body 1, and a main lever 10 is pivotally attached to the other end of the bushing rod 6 via a pin 11. There is.

The main lever 10 has an arm 10a divided into both sides.

10b, one arm 10a (control rack side) is inserted into the governor G, and the tip of the arm 10a is in contact with the contact portion 12a of the control rack 12 of the fuel injection pump P. The control rack 12 is connected to a lever 13 to which the control force of the governor G is transmitted, and the biasing force of a modulator spring (not shown) provided on the lever 13 is applied in the direction of fuel increase. There is. Friend, near the tip of the other arm 10b (on the side opposite to the control rack) of the main lever 10, a manual increase lever 14 and a full rack position adjustment stopper 15, which will be described below, are provided so as to sandwich the main lever 10.

The manual increase lever 14 is pivotally mounted on a shaft 16 fixed to the main body 1, and a pressing portion 14a provided at one end of the manual increase lever 14 is in contact with the main lever 10. The other end of the manual increase lever 14 is applied with operating force from a wire or solenoid (not shown), and rotates counterclockwise about the shaft 16 as a fulcrum against the start increase spring 15b of the full rack position adjustment stopper 15, which will be described below. Then, the main rack (-10) rotates clockwise about the bin 11, and the control rack 12 can be moved from the full rack position in the increasing direction.

Full rack position adjustment stopper 15ii, main lever 10 on the side opposite to the manual increase lever. The contact rod 15 that comes into contact with
a, and a starting increase spring 15b that presses this contact rod 15a and counteracts the rotational force of the manual increase lever 14.
and a spring capsule 15C that accommodates the spring 15b, and this spring capsule 15c is screwed onto the main body 1 to provide a full rack position adjustment function.

That is, when the spring capsule 15c is rotated, the main lever 10 is rotated about the bin 11, and the full rack position of the control rack 12 is determined by the position of the main lever 10.

In the Joropi course, when starting with 1c6, insert the starting increase button etc. (not shown) and turn the manual increase lever (-14) in the direction of the arrow shown in Fig. 1.This causes the full rack stopper 15 The starting increasing spring 15b is compressed, and the main lever 10 is rotated like a two-point chain leg with the bottle 11 as a fulcrum.At the same time, a force is applied to the control rack 12 from the lever 13 in the direction of increasing the amount of control. The rack 12 moves in the increasing direction from the full rack position until it abuts the main lever 10, supplying the engine with sufficient fuel required for starting.

When the engine is started and the rotation speed increases, the control rack 12 is returned to the decreasing direction to match the engine rotation speed, and the manual increase lever 14 is also returned to the normal position, so that the main lever 10 is determines the full rack position of the control rack 12.

When the engine speed further increases, the boost pressure increases and the pressure responsive member 5 is displaced against the boost compensator spring 7, the bushing rod 6 moves in the direction of the arrow in FIG. The control rack 12 rotates clockwise around the point of contact with the rack position adjustment stopper 15 as a fulcrum, and a modulator ring (not shown) works to move the control rack 12 in the direction of increase beyond the full rack position to match the amount of supercharging. It allows fuel to be supplied to the engine.

Next, talking about the adjustment method, first of all, setting force adjustment is as follows.
By turning the adjustment screw 8, the deflection of the boost compensator spring 7 changes, so the setting force of the boost compensator spring 70 can be adjusted.

Next, to adjust the full rack position, use the spring capsule 15.
Since the main lever 10 is rotated using the bin 11 as a fulcrum, the full rack position of the control rack 12 is adjusted. Since the adjustment of the setting force and the adjustment of the full rack position are separate and can be performed from the outside, they can be completed accurately and easily.

In the above embodiment, the application was applied to the boost compensator provided on the side of the governor G, but it can also be applied to the boost compensator provided on the side opposite to the governor as another embodiment, and the increase or decrease of the control rack 12 may be applied. Since only the direction is reversed, a person skilled in the art can easily carry out the process based on the above explanation, so the explanation thereof will be omitted.

As described above, according to the present invention, the full rack position of the control rack can be adjusted independently of the adjustment of the set force of the boost compensator spring, so each adjustment becomes accurate and easy. Further, since the manual increase lever is operated only by resisting the starting increase spring of the full rack position adjusting stop lever, the operating force for the manual increase lever can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the boost compensator according to the present invention showing the state before the start-up increase, and FIG. 2 is a cross-sectional view of the boost compensator according to the present invention showing the state before supercharging. DESCRIPTION OF SYMBOLS 1... Boost compensator main body, 5... Pressure response member, 6... Bush rod, 7... Boost convensator spring, 10.0. Main lever, 1
2...Control adjustment 14-...Manual increase lever, 15...Full rack position adjustment stopper, 15b
-... Starting increase spring, 15c... Spring capsule. Patent applicant: Diesel Equipment Co., Ltd. Figure 1

Claims (1)

[Claims] 1. A main lever that engages with a control rack of a fuel injection pump is pivotally connected to a bushing rod fixed to a pressure responsive member on which boost pressure acts, and the end of the main lever on the side opposite to the control rack is , a manual volume increasing lever that rotates the main lever to move the control rack from a full rack position in an increasing direction at the time of starting, and a starting volume increasing spring that is compressed by the rotational force of the manual volume increasing lever, so as to sandwich the main lever. , and a full rack position adjustment stopper for adjusting the full rack position of the control rack. 2. The boost compensator according to claim 1, wherein the full rack position adjustment stopper is formed by screwing a spring capsule containing a starting increase spring into the boost convencator main body.