JPS6026195Y2 - Maximum injection amount control device with engine stop function - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a maximum injection amount control device which determines the maximum injection amount of a fuel injection pump, and which is provided with an engine stop function.

Conventional examples of this type include Japanese Patent Application Laid-Open No. 53-2133 and Japanese Utility Model Application No. 54-84431.

JP-A-53-2133 Sae is a fuel control device consisting of a servo motor 6 and a limiter rate 8, which operates in conjunction with a key switch 1, and when the key switch 011 is activated, the control lever of the fuel injection pump is moved to the injection stop position. This configuration allows the fuel control lever to be operated from the injection stop position to the drive position by turning the fuel on and moving the key switch to the start position.

However, in this conventional example, although the control rack can be set to non-injection when the key switch is 011,
When the key switch is ON, the maximum injection amount position cannot be adjusted arbitrarily.

Furthermore, since a servo motor is used, it has poor followability during transients and is therefore inappropriate, and the motor requires the use of a large number of link mechanisms, which has the drawback of being prone to looseness.

In addition, in the above-mentioned Utility Model Application No. 54-84434, there is a configuration in which the fuel increase position and the normal maximum injection amount position are adjusted at the time of starting, but in the configuration shown, when the key switch 011 The control rack cannot be set to non-injection and the maximum injection amount position cannot be arbitrarily adjusted.
Separate devices are required for each, which not only complicates the structure but also increases costs.

Furthermore, it is possible to adjust the maximum injection amount position using an electronic speed governor as shown in Japanese Utility Model Publication No. 51-7376, but at the normal fuel injection position, the amount of movement of the control rack is 10~ It is large, with about 20 temples.
To obtain a constant or linear control force over this range, the actuator is large and expensive.

Therefore, in order to improve the reliability of the device, this invention has a mechanism that minimizes the number of link mechanisms, allows the maximum injection amount position to be adjusted with high precision, and furthermore, when the key switch is turned off, the engine The purpose of this device is to provide a maximum injection amount control device having a configuration that can stop the injection. a movable part, a maximum injection amount control lever is connected to the movable part, a pair of springs are provided so as to repel each other in the moving direction of the movable part, and the balance of the pair of springs allows the maximum injection amount to be The injection amount ni control lever is set to be near the required maximum injection amount position,
The movable part is displaced by the current supplied to the coil, thereby changing the position of the maximum injection amount control lever, and when the engine key switch is turned to the OFF position, the movable part is displaced to increase the maximum injection amount. The present invention is characterized in that a current is passed through the coil in order to move the injection amount control lever to the no-injection position.

Examples of this invention will be described below with reference to the drawings.

In FIG. 1, the maximum injection amount control device of the first embodiment is roughly divided into an actuator 1, a maximum injection amount control lever 2 that is moved by this actuator 1, and a control rack 3 that is engaged with this lever 2. The connector 4 is fixed to the connector 4.

The actuator 1 is fixedly attached to the fuel injection pump 6 by a bracket 5, and is provided above the banner, although not shown.

The actuator 1 is fixedly attached to the fuel injection pump 6 by a bracket 5, and has a base plate 7a made of a non-magnetic material.
, 7b are provided with a cylindrical yoke 12 which also serves as a case, and coils 10a and 10b are provided in a dantem manner on the yoke 12.

A cap 22 made of a non-magnetic material is attached to the upper end of the yoke 12.

The movable part 13 is a member 13a made of a non-magnetic material.

13b sandwich a magnet 13c, and the movable portion 13 is attached to a bushing rod 16 passing through the center.

The movable part 13 is supported by a spring 14 and a spring 15, and when the coils 10a and 10b are not energized, the springs 14 and 15 are in the balanced position shown by the solid line in the figure.

This position is set near the maximum injection amount position of the control rack 3, and can be adjusted by adjusting the set collar of the spring 15 with the adjustment screw 21.

The bushing rod 16 extends downward and protrudes to the outside via the bushing 17, and one end of the maximum injection amount control lever 2 is engaged with an engaging portion 18 at the lower end of the bushing rod 16.

The maximum injection amount control lever 2 is rotated clockwise and counterclockwise by the actuator 1 with the shaft 19 as a fulcrum, and one end is connected to the engagement portion 18 of the bushing rod 16 as described above, and the other end is connected to the control lever. It engages with a connector 4 fixed to the rack 3.

Only a portion of the fuel injection pump 6 is shown, and then,
The control rack 3 protrudes to the left.

In the above configuration, the coil 10 of the maximum injection amount control device
The current applied to a and 10b is supplied from a control unit (not shown) into which input signals such as the engine speed, boost pressure, atmospheric pressure, and engine key switch are input, and the current value controls the lever 2. The position is determined.

That is, the coils 10a and 10b are energized, the movable part 13 is displaced from the position indicated by the solid line in the figure against the spring 14 or 15, and the lever 2 is rotated counterclockwise or clockwise to change the position of the lever 2. The maximum injection amount is determined by

As described above, the movable part 13 is moved by the springs 14 and 15 so that the control rack 3 is located near the maximum injection amount position when the coils lea and 10b are not energized.
is positioned, the movement range of the movable part 13 for adjusting the maximum injection amount (from the solid line position in the figure to the spring 14
or 15) is narrow, and therefore the positioning of the lever 2 can be performed with high precision and responsiveness.

When the engine key switch is turned to the OFF position, current is passed through the coils 10a and 10b to displace the movable part 13 upward, and the movable part 13 is displaced upward against the spring 15, causing the lever 2 to move upward. The control lever 3 is rotated clockwise to the position indicated by the dotted line, and the control lever 3 is returned to the no-injection position.

Therefore, the injection pump 6 enters a non-injection state and the rotation of the engine stops.

In FIG. 2, a maximum injection amount control device according to a second embodiment of the invention is shown.

This embodiment differs from the first embodiment in that the configuration of the actuator 1 is different, and the movable part 13 is different from the first embodiment.
The coil and the waist magnet 23 are fixed. To briefly explain this embodiment, the actuator 1 is fixed to the fuel injection pump 6 with a bracket 5, and the base plate 7 has a case that serves as a yoke. 8 is placed.

Inside this case 8, there is a magnet 2 fixed to the case 8.
3, and the movable part 13 is arranged inside the magnet 23.

The movable part 13 is composed of a coil 13d, and a holder 24
It is fixed to the bushing rod 16 via.

The bushing rod 16 has a spring 1 interposed between an upper end 16a and a lower end of a spring case 25 made of a non-magnetic material.
4, and the upper end 16a contacts the rod 20 biased by the spring 15, and when the coil 13d is not energized, both springs 14, 15
It is supported at the position of the solid line, which is the force balance point.

For this reason, the movable part 13 is also in a similar position.

This position is set so that the control rack 3 is near the maximum injection amount position, as in the previous embodiment.

The rod 20 is housed in a cylindrical case 26 together with a spring 15, and is pressed by the spring 15 to close the case 26.
stands out.

This case 26 is the spring case 2 described above.
It is screwed into the inside of 5.

27 is a cap screwed onto the case 26.

Therefore, by adjusting the case 26, the position of the movable part can be changed.

The bushing rod 16 extends downward and projects to the outside via the bushing 17, and one end of the maximum injection amount control lever 2 is engaged with an engaging portion 18 at the lower end of the bushing rod 16.

The lever 2 is rotated about a shaft 19, and its other end is engaged with a connector 4 fixed to the control rack 3.

In the above configuration, when the coil 13d of the movable part 13 is energized from a control unit (not shown), the movable part 13 is displaced against the spring 14 or 15, and the lever 2 is rotated counterclockwise or clockwise. The maximum injection amount is controlled by the lever 2 position.

In this example as well, the coil 13d
Since the movable part 13 is positioned by the springs 14 and 15 so that the control rack 3 is located near the maximum injection amount position when no current is applied, the movement range of the movable part 13 for adjusting the maximum injection amount is narrow. The lever 2 can be positioned with high precision and responsiveness.

When the engine key switch is turned to the OFF position, a current is applied to the coil 13d of the movable part 13 in order to displace the movable part 13 upward, and the lever 2 is turned clockwise to the dotted line position and the control lever 3 is turned. It is returned to the no-injection position.

Since this invention is constructed as described above, the maximum injection amount can be adjusted accurately using the maximum injection amount control device, and furthermore, the control rack can be forcibly returned by turning the engine key switch off. It is possible to add an automatic stop function.

Therefore, there is no need to use a stop actuator as in the conventional case, which contributes to cost reduction and device simplification.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the first embodiment, and FIG. 2 is a sectional view of the second embodiment. 1...actuator, 2...maximum injection amount control lever, 3...control rack,
6... Fuel injection pump, 10... Coil, 13... Curved rotating part, 14.15... Spring, 16... Bush rod.

Claims (1)

[Scope of utility model registration request] In an actuator consisting of a coil and a magnet, one of the coil or the magnet is fixed and the other is a movable part, and a maximum injection amount control lever is connected to this movable part, so that the movable parts repel each other in the direction of movement. Arranged 1
A set of springs is provided, and the maximum injection amount control lever is set to be near a required maximum injection amount position by the balance of the one set of springs, and the movable part is displaced by the current supplied to the coil. When the engine key switch is turned to the OFF position, the coil is moved to displace the movable part and move the maximum injection amount control lever to the no-injection position. A maximum injection amount control device with an engine stop function that allows current to flow.