JPH0355795Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application The invention is a control device for limiting the output of a fuel injection pump for an internal combustion engine, the control device being under the action of at least one starting spring and having an adjusting piston. at least one limit stop disposed perpendicularly to the direction of movement of the displacement element of the injection pump, which limit stop is moved by a pressure that is related to the rotational speed of the control medium through the injection pump.
is received in a casing connected to the injection pump by means of two bearing holes and can be actuated by an adjusting piston guided in a guide hole;
Furthermore, in the position in which the limit stop is controlled only by the starting spring, it starts the starting stroke, and in the position in which it is under pressure of the control medium introduced into the pressure chamber of the guide hole and retracts the starting spring, the discharge starts. It relates to a type which is adapted to limit the full load position of the adjusting member.

BACKGROUND ART A fuel injection device having a control device of the type described above is
This is already known from Japanese Patent Application Laid-Open No. 1499/1983.
In known control devices of this type, the limit stop is moved by a starting spring when the internal combustion engine is stopped into a starting position in which the quantity regulating element can reach the starting position. Such a constant and reliably adjusted starting position must be adjusted to an increasing control position beyond the full load position in order to ensure a more reliable cold start;
This increase control position is not only not necessary in the case of a warm-up engine, but also leads to the production of smoke which unnecessarily increases the fuel consumption and, in particular, unduly increases the exhaust gas composition. Therefore, care must be taken to ensure that the internal combustion engine does not maintain an increase in starting injection amount that exceeds the full-load injection amount in the case of a engine stop and therefore a lack of control medium pressure in a warm-up engine. No.

Problem to be Solved by the Invention The problem to be solved by the invention is to ensure that the regulating piston, which is actuated by the control medium pressure, can be released as a function of the temperature or maintained in the full load position during warm-up. be.

Means for Solving the Problem The means taken to solve the above-mentioned problem is to lock in a hole that is arranged at right angles to the guide hole and that opens into the guide hole within the stroke range of the adjusting piston. A slide is guided, the locking slide being movable into the pressure chamber by means of an adjusting element whose effective length can be changed in dependence on the temperature; and between the adjusting element and the locking slide: The drag member is arranged to be elastically flexible.

Effects of the invention In the invention, a locking slide arranged at right angles to the longitudinal axis of the adjusting piston can be moved into the pressure chamber by means of an adjusting member whose effective length can be changed in dependence on the temperature. In addition, since the adjustment piston can be locked in the full load position at the time of warm-up and startup, no undesirable force is exerted on the stopper lever from the side. Furthermore, by disposing a spring-elastically flexible drag member between the adjusting member and the locking slider, the locking slider is pushed toward the adjusting piston by the temperature-responsive adjusting member. This reliably prevents the adjusting piston, which is already in the starting position, from becoming stuck due to excessive pressing force of the locking slider.

Example The invention will be explained below with reference to the illustrated embodiments.

Control device 10 shown in cross section in the drawing
is attached to a fuel injection device for an internal combustion engine, only the essential structure of which is shown broken away, and the fuel injection device consists of a fuel injection pump and a speed governor 11 (not shown), and the speed governor The constituent members of the control device 10 described below are incorporated into the governor casing 12, or the constituent members are attached to the governor casing 12.

The control device 10 generally includes a starting spring 1
a locking slide 1 operated by a limiting stop 14 under the action of 3, an adjusting piston 15 and an adjusting member 16 whose effective length can be changed in dependence on temperature;
It consists of 7. Furthermore, the limit stop 14 itself is supported coaxially with respect to the adjusting piston 15 in bearing holes 18, 19 of two bearing bushes 20, 21 fixed to the governor casing 12, and is longitudinally movable. 22, and a stopper lever 23 supported on the shaft. The stop lever 23 has a push spring 24 loaded with a weak preload in the illustrated starting position of the limit stop 14.
is pressed against the shoulder 25 on the shaft 22. The starting spring 13, which has a stronger prestress than the push spring 24, maintains the shaft 22 and thereby the entire limit stop 14 in the position shown, in which the limit stop 14 formed by the snap ring 26 is closed. The abutting flange faces the outward end surface 21a of the bearing bush 21.
Supported by

A hydraulically actuated adjusting piston 15 is guided in a guide bore 27 of a stopper housing 28 which is flanged to the governor housing 12 .

As can be seen from Figure 2, the stopper lever 23
The pivoting position of is determined by the position of the actuating pin 30a of the full-load stopper 30 in relation to the boost pressure, which is known and is not shown here. In this case, one lever arm 25 of the stopper lever 23
a is in contact with the shoulder 31a of the ring groove-shaped cutout of the operation pin 30a, and the other lever arm 25b of the stopper lever 23 is in contact with the shoulder 31a of the ring groove-shaped notch of the operating pin 30a. Stopper lever 2 is moved to the right side in Figure 1.
When 3 is in the full load position, indicated by dash-dotted lines and designated 23', it serves as a limiter for the adjustment distance of the adjustment rod 33, which is used as a displacement adjustment member of the fuel injection pump. The stop lever rests indirectly via a projection 34 on a connecting plate 35, which is connected to an adjusting rod 33 and a speed governor operated by a centrifugal speed governor in a known manner, not shown. 11 adjustment levers 44 are connected.

The locking slide 17 is guided in a bore 36 of the stopper casing 28 which is arranged at right angles to the guide bore 27 and which opens into said guide bore 27 within the stroke range of the adjusting piston 15, and which can be further adjusted. A drag member 37 that is elastically flexible is fitted between the member 16 and the locking slider 17. The drag member 37 has a stroke limiting sleeper 39 in direct contact with the operating pin 38 of the adjusting member 16;
It consists of a return spring 41 which holds the stroke limiting sleeve 39 against the operating pin 38, and a drag spring 42 supported by the stroke limiting sleeve 39 on one side and the locking slider 17 on the other side. As adjustment element 16, a ductile material working element serves in the aforementioned case, which is made safe against overload by a spring 43, which of course carries out the adjustment movement in dependence on the temperature. It can be replaced with another adjustment member.

In the drawing, the operating pin 38 of the ductile material working member 16 has the length achieved at dynamic temperatures. The actuating pin therefore presses the travel-limiting sleeve 39 against the force of the spring 41 into the position shown and thereby also tensions the locking slide 17 via the drag spring 42. As a result, as soon as the cylindrical section of the adjusting piston 15, designated by 15a, comes into the action range of the locking slide 17 when the adjusting piston 15 moves to the right under the engine control medium pressure, the locking slider 17 17 rushes into the pressure chamber 32. Such a cylindrical section 15a forms a step 15b which faces the pressure chamber 32 and has a diameter d _A that is smaller than the diameter D _F of the guide hole 27 . Such a locking position with the locking slide 17 projecting into the pressure chamber 32 is shown in dash-dotted lines.

The travel-limiting sleeve 39 and the spring 43 allowing displacement of the ductile working member 16 advantageously prevent the following. In other words, even if the operating temperature rises above the reference value, the locking slider 17 will not exert a large pressing force on the adjusting piston 15, and the pressure chamber 3
2 is prevented from being moved deeply into the 2.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a control device according to the invention, and FIG. 2 is a partial cross-sectional view of a speed governor with a full-load stopper. 10...control device, 11...speed governor, 12...
Governor casing, 13...Start spring, 14
...Limiting stopper, 15...Adjusting piston, 15
a... Division, 15b... Step portion, 16... Adjustment member, 17... Locking slider, 18, 19... Bearing hole, 20, 21... Bearing bush, 21a... End face, 22... Shaft, 23... Stop lever, 24
...Press spring, 25...Shoulder, 26...Snap spring, 27...Guide hole, 28...Stopper casing, 29...Return spring, 30...Full load stopper, 30a...Operation pin, 31... Pressure conduit, 32...pressure chamber, 33...adjustment rod, 34...
Stopper protrusion, 35... joint plate, 36... hole, 3
7...Drag member, 38...Operation pin, 39...
...Stroke limiting sleeve, 41...Return spring, 42...
...drag spring, 43...spring.

Claims (1)

[Claims for Utility Model Registration] 1. A control device for limiting the output of a fuel injection pump for an internal combustion engine, which is under the action of at least one starting spring and which controls the rotational speed of the control medium via a regulating piston. a limiting stop which is moved by a pressure associated with the injection pump, the limiting stop being adapted to control the injection by means of at least one bearing hole arranged perpendicularly to the direction of movement of the displacement element of the injection pump. It can be actuated by an adjusting piston received in a housing connected to the pump and guided in a guide hole, and furthermore, in a position in which the limit stop is controlled only by a starting spring, the starting stroke is prevented. and in a position where the start spring is contracted under the pressure of the control medium introduced into the pressure chamber of the guide hole, the full load position of the discharge adjustment member is limited. , a locking slide 17 is guided in a bore 36 which is arranged at right angles to the guide hole 27 and opens into the guide hole within the stroke range of the adjusting piston 15, and which locking slide In connection with this, a drag member 37 is movable into the pressure chamber 32 by means of an adjusting member 16 whose effective length can be changed, and between the adjusting member 16 and the locking slide 17 there is provided a drag member 37 which is elastically flexible. 1. A control device for limiting the discharge amount of a fuel injection pump for an internal combustion engine, characterized in that: 2. A stroke limiting sleeve 39 in which the drag member 37 directly contacts the operating pin 38 of the adjustment member 16.
, a return spring 41 for holding the stroke limiting sleeve 39 against the operating pin 38, and a drag spring 42 supported by the stroke limiting sleeve 39 on one side and on the locking slider 17 on the other side. A control device according to registered claim 1. 3. Utility model registration claim in which the adjusting piston 15 has a cylindrical section 15a facing the pressure chamber 32 and forming a step 15b, with a diameter d _A smaller than the diameter D _F of the guide hole 27. A control device according to scope 1 or 2.