DE1005316B - Device for internal combustion engines to adjust the start of delivery of the fuel injection pump - Google Patents

Description

The invention relates to a device for injection internal combustion engines for adjusting the start of delivery of the fuel injection pump, which has a member whose variable adjusting force, the acts against the force of a spring, is used during operation of the internal combustion engine to the camshaft of the fuel injection pump via a suitable coupling opposite the crankshaft to twist the internal combustion engine, and in the one on the heat condition of the machine and the outside temperature responsive thermostat acts on the link in the sense that for starting the Internal combustion engine a point in time for the start of delivery of the fuel injection pump, which from the one that automatically operates during the operation of the internal combustion engine for the lowest operating speed is set by the device is different.

The invention consists in that the spring loading the member is designed at the same time as a thermostat is. The device is substantially simplified in an advantageous manner by the invention.

In a device in which a radially movable centrifugal weight is applied from the outside by a leaf spring is loaded, this leaf spring is designed according to the invention as a bimetallic spring.

The bimetallic spring can be designed in such a way that when the machine is cold it lifts the flyweight, with regard to its shift in the sense of an early postponement of the start of delivery of the fuel injection pump, releases by a certain amount. This design of the bimetal spring is for fuel injection engines particularly advantageous.

If an internal combustion engine is equipped with a control device for the start of delivery of the fuel injection pump, a start of delivery is determined by this control device when the machine is at a standstill, which is assigned to the lowest operating speed and is therefore correspondingly late. It has been shown that in the case of internal combustion engines, in particular diesel engines, the time set by the control device for the start of delivery of the fuel in the case of a cold start is too late for starting. This is due to the fact that when a diesel engine is started, its cold state and the low delivery speed of the piston of the fuel pump mean that the ignition delay is large and the fuel is therefore ignited too late. It results from the fact the task of the control apparatus determined by the start of the feeding of fuel when starting the diesel engine that the same is carried out so as to \ ^r erändern earlier. So if the bimetal spring increases the flyweight by a certain amount when the machine is cold

contraption

for internal combustion engines

to adjust the start of delivery

the fuel injection pump

Applicant:

Klöckner-Humboldt-Deutz

Aktiengesellschaft, Cologne-Deutz,

Mülheimer Str. 149

Dr.-Ing. Otto Cordier, Cologne-Kalk,
has been named as the inventor

know the amount released, the flyweight can move into a position when starting, in which it one determined earlier time for the start of the delivery of the fuel to be injected. During the During operation, the setting for the lowest operating speed is automatically made by the bimetal spring a later point in time for the start of the delivery of the fuel to be injected.

In the context of the new invention, however, it is also possible that the flyweight when the machine is at a standstill is moved by the bimetal spring into a position in which there is a later start of delivery of the fuel injection pump sets when it is automatically set during operation by the device for lowest Operating speed is set. Such an influence on the flyweight by the bimetal spring is important for such injection internal combustion engines that work with a speed range in which the lowest operating speed is relatively high. The start of delivery of the fuel injection pump set by the device for this lowest operating speed is then too early to start the internal combustion engine.

In the drawing, an embodiment of the invention is shown as an example.

Fig. 1 shows a longitudinal section through a fuel injection pump with built-on control device for the start of delivery of the fuel injection pump; Fig. 2 shows a section along the line H-II in

** Fig. 1. In Fig. 2, the section according to Fig. 1 is indicated by the line II.

The fuel injection pump has a drive gear 1. The gear 1 is indirectly or indirectly

S09 866/213

indirectly driven by the crankshaft of the internal combustion engine. The driven wave of the The fuel injection device is the camshaft 3. The camshaft 3 is supported with its projection 4 Resiliently against the projection 6 of the gear 1 via the spring 5. Between the two projections 4 and 6 a flyweight 7 is arranged. This flyweight 7 works with wedge-shaped surfaces 8 and 9, respectively the projections 4 and 6 wedge-shaped together such that an outward movement of the flyweight 7 a Compression of the spring 5 causes. With this relative rotation, the camshaft 3 becomes the fuel injection pump 2 rotated in the direction of earlier injection. The flyweight 7 is through a inwardly pressing leaf spring 10, which is fastened to the projections 4 of the camshaft 3, is loaded. In the housing 11 still attached to the fuel injection pump is the one on the control rod 12 of the fuel injection pump built-in regulators to regulate the injection quantity. The leaf spring 10 has the special feature that it is designed as a bimetallic spring, it is therefore subject to the heat state of Machine and the outside temperature. Depending on these temperature conditions, determines the Bimetallic spring the favorable point in time for starting the internal combustion engine the delivery of the fuel by the fuel injection pump.

The invention is not limited to the use of devices with flyweights work. The invention has the same advantages in hydraulic regulators, among others.

Claims (3)

Claims = 1.Device for internal combustion engines to adjust the start of delivery of the fuel injection pump, which has a member whose 35 variable adjusting force, which acts against the force of a spring, is used during operation of the internal combustion engine to rotate the camshaft of the fuel injection pump via a suitable coupling relative to the crankshaft of the internal combustion engine, and in which one is more responsive to the heat condition of the engine and the outside temperature Thermostat acts on the member in the sense that, for starting the internal combustion engine, a point in time for the start of delivery of the fuel injection pump, which is different from that which is automatically set by the device during operation of the internal combustion engine for the lowest operating speed, characterized in that, that the spring loading the member is also designed as a thermostat. 2. Apparatus according to claim 1, wherein a radially movable flyweight from the outside is loaded by a leaf spring, characterized in that this leaf spring is a bimetallic spring is designed such that when the machine is cold, the flyweight, with regard to its shift in the sense of an earlier shifting of the start of delivery of the fuel injection pump, releases by a certain amount. 3. Apparatus according to claim 1, wherein a radially movable flyweight from the outside is loaded by a leaf spring for an internal combustion engine whose lowest operating speed is relatively high, characterized in that this leaf spring is designed as a bimetallic spring is such that it moves the flyweight into a position when the machine is cold, in which sets a later start of delivery of the fuel injection pump than it does during operation is automatically set by the device for the lowest operating speed. 1 sheet of drawings ι 609 866/213 3.57