JPS58192961A - Fuel injection pump for internal-combustion engine - Google Patents

Abstract

PURPOSE:To reduce the number of parts of a fuel injection pump and to simplify the structure thereof by a constitution wherein a rack regulating member engaging with a rack and regulating the range of the movement of this rack is provided on the outer surface of the housing of the pump. CONSTITUTION:A cylinder 2 is provided in the housing 1 of a fuel injection pump, and a plunger 3 is provided slidably in the cylinder 2. On the outer surface of the housing 1, a rack regulating member 15 engaging with a rack 14 and regulating the range of the movement of the rack is provided. One end side of this rack regulating member 15 is extended to a position whereat a guide pin 19 is passed through, and is made to contact from the outside with the head of this guide pin 19. Accordingly, the rack regulating member 15 can be used also for preventing the guide pin 19 from slipping off. Thus, the number of parts of the pump can be reduced and the structure thereof can be simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an internal combustion engine fuel injection pump applied to, for example, an f'4-zerennon.

In general, this type of fuel injection pump has a cylinder installed in the housing, and a seven-wheel cylinder is slidably fitted into this cylinder, and this cylinder is reciprocated via a tappet based on the rotation of a cam. It acts as a pump for fuel injection. ``Furthermore, in this fuel injection pump 1, the rotational angle position of one run relative to the cylinder can be changed to D4Ii by a rack to control the precision of the fuel injection.

By the way, in the fuel injection pump having the above configuration, the tappet is slidably provided within the housing and converts the rotation of the cam into a reciprocating motion of the plantar. Therefore, the tappet may inadvertently rotate within the housing. It is not preferable for the tappet to fall off from the housing, and furthermore, it is necessary to reliably prevent problems such as the tappet falling off from the housing.

For this reason, in the past, the housing was penetrated and the
A guide pin is provided which is engaged with the shaft, and this guide pin is used to prevent the shaft from rotating and to prevent it from falling off. However, when such a guide pin is used, in order to prevent the guide pin from being removed,
However, it is necessary to fix the bin to the housing using a snap ring or the like. For this reason, the snap ring receiver has a groove formed in the head of the guide pin, which complicates the structure, increases the number of parts, and increases costs.

This invention was made based on these circumstances, and its purpose is to provide a fuel injection sonde for internal combustion engines that has a simple structure and can reduce the number of parts. .

In other words, in this starting BA#i, a rack regulating member is provided on the outer surface of the housing to engage with the rack and restrict the movement range of the rack, and one end of the rack regulating member is inserted through the guide pin. The guide is characterized in that it extends to a position and abuts the head of the bottle from the outside.

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 shows a fuel injection pump applied to, for example, a diesel engine, and numeral 1 in the figure indicates an engine. Inside this pump housing 1, the same number of cylinders 2 as the cylinders of the Ennon are arranged, and one langeer 3 is slidably fitted into each of these cylinders 2. Enter. The lower end of each grand gloss 3 is brought into contact with a tappet 5 via a lower jilling seat 4. This plate 5 is slidably arranged within the housing 1, for example a cylindrical plate) &
A rack is provided with a roller bin 7 inside the tray 6, and a cylindrical roller 8 is rotatably fitted into the roller bin 7.

Further, the tappet 5 is brought into contact with a cam (not shown) on a camshaft that is rotationally driven by the engine, and the rotation of this cam is converted into a reciprocating motion of the syringe 3 to perform a pumping action for fuel injection. There is. During the reciprocating movement of the knob and plunger 3, the fuel sucked in from the fuel suction hole 21 of the cylinder 2 is compressed to a pressure that is injected into each cylinder through the discharge valve 9. In addition, 10.10 is a valve case of the discharge valve 9.9, and No. 1 is a plunger spring.

On the other hand, a td control sleeve 12 is attached to the syringer 3, and the control sleeve 12 is rotatable together with the plunger 3. and,
The control sleeve 12 is provided with a pin 13.

This pin on 13 is engaged with a rack 14, and is rotated many times by the movement of this rack 14, so that the grand gloss S is rotated via this pin on 13, that is, the control sleeve 12. That is, by adjusting the rotational angular position of the grand gloss 3 with respect to the cylinder 2 in this way, the relative position between the notch 31 of the grand gloss 3 and the -F period fuel intake hole 21 is displaced. By adjusting the amount of fuel sucked in from the hole 2a, the precision of the fuel injection can be controlled. Incidentally, it goes without saying that the above-mentioned movement of the ridge 14 is performed in response to depression 1 of the accelerator pedal or the like at the encoder.

A rack regulating member 1 is provided on the outer surface of the housing 1.
6 is attached. A length @ 16 along the movement direction of the rack 14 is formed in the upper part of the rack regulating member 15, and a stock 9 bin 17 fixed to the rack 14 is formed in this long groove 16.
are inserted and engaged. Therefore, the moving range of the rack 14 is limited to the long groove 16 via the mother pin 17.
The length of the plunger 3 is regulated by the length of the button, thereby preventing the plunger 3 from being rotated more than necessary. In addition, 1g, II
I is a fixing screw that fixes the curvature regulating member 15 to the housing 1.

Further, on the outer surface of the housing 1, there are provided guide bins 19 through which the housing 1 is passed. These guide pins 19 are inserted into and engaged with guide grooves 20 formed in the corresponding grooves 6 of the grooves 5 at their distal ends. Therefore, each of the above guides/
19 are respectively inserted into the guide grooves 2oVc of the covers 5, so that each Yuhata 5 is prevented from turning and is prevented from falling off. Note that the guide fk20 is formed along the reciprocating direction of each tappet 5, and of course does not hinder the reciprocating movement of the tappet 5.

In this embodiment, one end side, that is, the lower end -j of the curvature regulating member 15 is extended to the position where each of the guide pins 190 passes through, and abuts against the head of each guide pin 19 from the outside. It has become.

Therefore, if the girth regulating member 15 is used as described above, the lower end side of the girth regulating member 15 will come into contact with the head of each of the guide pins 19, so that each guide The rack regulating member 15 can also be used to prevent the pin 19 itself from being removed. Therefore, there is no need to provide a fixing member for each guide bin 19 itself to the housing 1, so the number of parts can be reduced.Furthermore, unlike the conventional case where a snap ring is used, the snap ring receiver does not have a groove or the like. There is no need to form the head of each guide pin 19, and the overall structure can be simplified, and costs can be reduced.

In the above embodiment, the end of the rack regulating member 150 covers the entire head of each guide bin 190 to prevent the guide bin 19 from being pulled out. As shown in FIG. This leg portion 15m forms a portion 15a...
By preventing the guide pins 19 from being pulled out, the overall weight can be reduced. Furthermore, the leg portions 15 and .

1. Explanation [7] This invention engages with the rack on the outer surface of the unong to restrict the range of movement of the rack.
A curvature regulating member is provided, and one end of the curvature regulating member extends to a penetration position WL of the guide pin so as to come into contact with the head of the guide pin from the outside. therefore,
Since the rack regulating member can prevent the guide pin from being pulled out, the overall number of parts can be reduced and the structure can be simplified, which has great practical effects.

[Brief explanation of drawings]

Fig. 1 and Fig. 2 show a refreshing embodiment of the present invention, Fig. 1 is a side view of the whole, Fig. 2 is a cross-sectional view taken along n-us in Fig. 1, Fig. 3 and Fig. 4. 3 shows another embodiment of the present invention, FIG. 3 is a side view of the whole, FIG.
■It is a sectional view along the line. DESCRIPTION OF SYMBOLS 1... Housing, 2... Cylinder, 3... Plant gear, 5... Tappet, 14... Rack, 15...
... Rack regulating member, 19... Guide pin.

Claims (1)

[Claims] A cylinder is provided within the housing. A syringer is slidably provided in the cylinder, and the syringer is reciprocated through the cylinder based on the rotation of the cam, thereby performing the pumping action for fuel injection. In a fuel injection bonder for an internal combustion engine that is pressurized to adjust the amount of fuel to be injected by controlling the lever through the housing, the lever penetrates the housing and engages with the tappet at its tip to guide the reciprocating movement of the lever tappet. In addition to providing an idle pin, a rack regulating member is provided on the inner surface of the housing to engage with the rack and restrict the range of movement of the rack, and one end of the guide pin extends to the penetrating position of the guide pin. A fuel injection differential for an internal combustion engine characterized by being brought into contact with the head of the guide pin from the outside.