RU14386U1 - COUPLING AUTOMATIC FUEL INJECTION ADVANCE - Google Patents

Abstract

Automatic fuel injection timing coupling, consisting of a housing, a leading and driven coupling half, weights and springs, characterized in that the bolts are fitted with persistent bolts with adjusting washers to provide a given angle of fuel injection timing.

Description

COUPLING AUTOMATIC FUEL INJECTION ADVANCE

The utility model relates to engine building and can be used in diesel engines to automatically change the angle of advance of fuel injection depending on the frequency of rotation1;

Devices for ensuring automatic change of the angle of advance of fuel injection into the cylinder of a diesel engine are widely known, see, for example, description to copyright certificate (patent) No. 1566063 Е02М 59/20. The first coupling, containing the leading and driven half couplings with fingers, loaded with loads, is placed on the leading floor of the coupling and connected to the driven floor by hydraulic dampers.

A disadvantage of this design is that the design accuracy of the fuel injection lead is ensured by the actual sum of additional parts that make up, i.e. the spread of the injection lead angle in practice can be significant, which x gives the diesel operation parameters.

A device is known for adjusting the angle of advance of fuel injection into a diesel engine according to the copyright certificate (patent) No. 1740753 F02M59 / 00, in which with the aim of improving the accuracy of the installation of the opera F02M 59/00 59/20

In addition, the angular displacement mechanism is made in the form of a hydraulic actuator with a control spool, a quick coupling unit and a master device. The disadvantage of this design is its complexity and therefore low reliability in real operating conditions.

The aim of the proposed woodland model is to provide increased accuracy of installation of the fuel injection advance angle by a simple constructive solution.

This goal is achieved by the fact that in the proposed coupling, consisting of a housing, a driving and driven half coupling, weights and springs, thrust bolts with adjusting washers are installed in the loads to guarantee the installation of the angle of advance of fuel injection with a given degree of accuracy.

The proposed coupling is shown in the drawing, in which Fig. 1 shows the device of the proposed coupling in a section in a plane passing through its axis of rotation and in Fig. 2 is a sectional view of the left of the same coupling.

The coupling has the following device.

 coupling half 1, fixed to the entire drive from the motor (not shown in the drawing) is simultaneously mounted on the hub of the driven coupling half 2, with the possibility of rotation on it. The rotation from the leading floor of the coupling to the driven is transmitted through two weights .1 The load 3 swings on the axes 4, in a plane perpendicular to the axis of rotation of the coupling.

Two fingers 5 of the leading coupling half 1 through the spacers 6 abut against the longitudinal projections on the weights 3 and are pressed against them by the force of two springs 7 mounted between the axis 4 and the finger 5, and abut against the platforms on the finger and on the axis. The force of the springs 7 tends to hold the loads 3 against the stop in the sleeve 8 of the driving coupling half 1. The conical surface D of the driven coupling half is mounted on the camshaft of the injection pump (not shown).

The design of the proposed coupling also provides persistent bolts 9 with adjusting pipe 10 installed in the cargo 3.

When adjusting the predetermined lead angle of fuel injection into the engine cylinders, they provide the corresponding rated nominal clearance b between the head of the thrust bolt 9 and the inner surface of the bore in the coupling body 11, fastened to the driven floor by the coupling 2 by selecting the thickness of the washers 10. Then, the bolt1 9 is fixed (including with glue) in cargo 3.

To bring the coupling into rotation on its leading half-coupling 1, the protrusions 12 are provided.

The proposed automatic clutch injection angle operates as follows

The torque from the drive shaft (not shown in the drawing) through the protrusions 12 on the driving floor coupling 1 is transmitted to the driven floor coupling 2 through the loads 3.

With an increase in the number of revolutions of the engine and, consequently, of the leading coupling half 1 under the action of centrifugal force, the loads 3 diverge, as a result of which the driven coupling half 2 rotates relative to the driving coupling half 1 in the direction of rotation of the cam shaft of the pump, which automatically increases the injection angle of the toplier. With a decrease in speed, weights 3 converge. The springs 7 together with the pump shaft rotate the driven half-coupling 2 relative to the leading half of the coupling 1 in the direction opposite to the rotation of the coupling, which reduces the angle of advance of fuel injection. We assume that the specified limits of the change in the lead angle are determined by the clearance bd by the bolt head 9 and the housing 11.

In addition to increasing accuracy, the proposed design provided for a given injection advance angle also eliminates the free movement of one of the loads (couplings) arising due to technical tolerances for the manufacture of coupling parts.

Claims (1)

Automatic fuel injection timing coupling, consisting of a housing, a leading and driven coupling half, weights and springs, characterized in that the bolts are fitted with persistent bolts with adjusting washers to provide a given angle of fuel injection timing.