JP2572512Y2 - Cylinder independent injection pump - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder independent injection pump.

[0002]

2. Description of the Related Art Conventionally, a row-type injection pump has been employed for distributing fuel to each cylinder of an engine. This row-type injection pump is obtained by compactly integrating a large number of pump units into one housing. Therefore, there is a difference in the length of the injection pipe connecting each pump unit and the fuel injection nozzle of each cylinder, and when the length of the injection pipe is long, the fuel injection timing is delayed especially during high-speed rotation of the engine. There was a problem that would.

Therefore, the present applicant makes a pump unit mainly composed of a pump chamber, a plunger and a control rack independent for each cylinder, and hooks a control link 3 on a control rack pin 2 of these pump units 1 as shown in FIG. In order to allow the plungers 4 of the respective pump units 1 to operate in synchronization with each other, a new independent injection pump for each cylinder in which the plungers 4 of the pump units 1 can be driven by a single camshaft 5 is provided. Devised. In FIG. 3, reference numeral 6 denotes an injection pipe, and reference numeral 7 denotes a fuel injection nozzle.

Therefore, according to such a configuration, the length of the injection pipe 6 can be shortened on average, and the "injection delay at the time of high-speed rotation" which has conventionally been a problem can be solved.

[0005]

However, the above-described independent injection pump for each cylinder is not provided with a device for accurately setting the engine supercharging amount, and the engine displacement (cylinder bore) is changed. (Such as changing the diameter, changing the stroke, installing a turbocharger, etc.), there is no device that can accurately change the starting supercharging amount. There is a problem that the engine cannot be started when the fuel flow rate is high.

In order to solve this kind of problem, a so-called startup supercharging (startup increase) measure is generally taken in which the fuel flow rate at the time of engine start is made larger than the fuel flow rate at the time of normal operation. However, it is not just that the engine supercharging should be simply increased. That is, if the fuel flow rate is too large, a large amount of exhaust black smoke is generated,
If the amount is too small, the engine cannot be started.

An object of the present invention is to provide a cylinder independent injection pump having a means for accurately determining a starting supercharging amount.

[0008]

In order to achieve the above object, the present invention provides a cylinder block which is provided close to each cylinder of a cylinder block, and pressurizes a fuel pressurized by a plunger to a fuel injection nozzle through an injection pipe. A cam shaft for reciprocating the plungers, a control link for engaging the control rack pins of the pump units and operating the control rack pins in the direction of increasing or decreasing the fuel. And a governor coupling system coupled to the control link for operating the control link to its start increasing position. The control link has a slide hole for engaging with an engagement pin on a side surface of the cylinder block. In the hole, the governor connection system moves the control link to the set start increasing position. Ends with its increasing direction of the slide bore opposite those which are formed so as to abut on the engaging pins when brought into.

[0009]

When the governor connection system moves the control link to the set start increasing position (start supercharging position), the end of the slide hole opposite to the increasing direction abuts on the engaging pin. Therefore, when the engine is started, the fuel flow rate is accurately determined, and the engine is started well.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to the accompanying drawings. The same components as those of the prior art are denoted by the same reference numerals, and detailed description thereof will be omitted.

FIG. 1 shows a mounting relationship between a pump unit mounting portion of a cylinder block (hereinafter referred to as a mounting portion) and a pump unit to this mounting portion, and FIG. 2 shows a mounting relationship between a cylinder block and a control link. Have been.

As shown in FIG. 1, the mounting portion 8 is
Connect one side of the cylinder block 9 to a cylinder (not shown).
Are formed in a box shape along the column direction, and the top plate portion 10 is formed with insertion ports 11 for inserting and removing the pump unit 1 up and down at intervals in the column direction of the cylinder. Have been. The number of the insertion ports 11 is the same as the number of cylinders, and is provided at positions parallel to the cylinders. The top plate 10 has an insertion opening 11.
The mounting bolt (not shown) inserted into the bolt insertion hole 13 is screwed into a portion around the hole and at a position corresponding to the bolt insertion hole 13 formed in the mounting flange 12 of the pump unit 1. A screw hole 14 for integrally attaching the pump unit 1 to the top plate 10 is provided.

The front plate 15 of the mounting portion 8 is provided at a position corresponding to each of the insertion ports 11 so that the pump unit 1 set in the insertion hole 13 can be properly maintained. An opening 16 is formed in a rectangular shape,
A pin fitting hole 18 is provided in the vertical frame portion 17 between the openings 16, 16.
Are formed. The pin fitting hole 18 is formed so that a stepped pin (engaging pin) 19 is fitted integrally.

The control link 20 has slide holes 21 formed at intervals in the longitudinal direction. The strokes of these slide holes 21 are determined according to the strokes of a control rack (not shown). The control link 20 has a pin engaging portion 22 at the center between the adjacent slide holes 21 and 21 by notching the control link 20 vertically from one side edge to the other side edge. A pin hole 24 is formed on the input side (end on the weight reduction side) for pin-connecting a control link system (governor connection system) 23 of the governor. Each of the pin engaging portions 22 is cut out upwardly so as to be flared upward (slope-like) in order to guide the control rack pin 2 to the upper portion thereof. Therefore, the removal of the pump unit 1 is simply completed by simply lifting the pump unit 1 upward. The groove width of the pin engaging portion 22 is determined to a width dimension that allows the control rack pin 2 to be engaged with a minimum clearance.

The width of each slide hole 21 is set to be slightly larger than the shaft of the stepped pin (engaging pin) 19, and the position of each slide hole with respect to the control link 20 is controlled by the control link system. (Governor connection system) Center O of pin hole 24 connecting control link 20 and control link 20
When the center O of the pin hole 24 is moved to a preset start increasing position by the control link system (governor connection system) 23 with respect to the reference, the side opposite to the end in the increasing direction of each slide hole 21. Is positioned at a position where it comes into contact with the shaft of the stepped pin 19.

Next, the operation of this embodiment will be described.

When the engine is started, the biasing force of the governor start spring is transmitted to the control link system 23, and the control link system 23 moves to the set start increasing position side.
The control link 20 moves in the fuel increasing direction together with the control link system 23.
However, when the set increase position is reached, each slide hole 2
The end on the decrease side of 1 abuts against the stepped pin 19 and stops. For this reason, further movement of the control link 20 is restricted, and the fuel flow rate of each pump unit 1 is normally started by receiving a supercharging suitable for the engine.

In order to change the set increase position for an engine with a large displacement or an engine with a small displacement, the position of the pin insertion hole 18 may be moved in the direction A or B in FIG.

[0019]

As is apparent from the above description, according to the present invention, the engine can be properly started and supercharged in conjunction with the governor connection system, and the engine can be started well. It is effective.

[Brief description of the drawings]

FIG. 1 is a view showing a preferred embodiment of an independent injection pump for each cylinder according to the present invention.

FIG. 2 is a diagram showing a mounting relationship between a cylinder block and a control link.

FIG. 3 is a diagram showing a cylinder-based independent injection pump that forms the basis of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pump unit 2 Control rack pin 4 Plunger 5 Camshaft 6 Injection pipe 7 Fuel injection nozzle 9 Cylinder block 19 Stepped pin (engaging pin) 20 Control link 21 Slide hole 23 Control link system (Governor connection system)

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ identification code FI F02M 39/00 F02M 39/00 Z (58) Fields investigated (Int.Cl. ⁶ , DB name) F02M 59/28 F02M 39 / 00 F02D 1/02 321 F02D 1/02 311

Claims (1)

(57) [Scope of request for utility model registration] 1. A pump unit provided in a cylinder block in close proximity to each cylinder thereof to supply fuel pressurized by a plunger to a fuel injection nozzle via an injection pipe, and a reciprocating unit for reciprocating the plungers. A control link for engaging the control rack pins of each of the pump units with the camshafts and operating the control rack pins in the fuel increasing / decreasing direction. The control link has a slide hole that engages with an engagement pin on the side surface of the cylinder block, and the slide hole is provided when the governor connection system sets the control link to a set start increasing amount. When moved, the end of the slide hole opposite to the direction of increasing A cylinder independent injection pump characterized by being formed so as to abut against said engaging pin.