SU104310A1 - Single-piston fuel pump for multi-cylinder engines - Google Patents

Description

The well-known single-plunger top pumps for multi-cylinder engines, equipped with a balanced rotating distribution valve, made it possible to vary the total duration of fuel injection into the cylinders when turning the sleeve of the valve, do not create conditions for torque adjustment (knee to engine shaft) during the engine .

In the pump according to the invented 1yu such an opportunity is provided.

The pump has the peculiarity that, in order to regulate the moment of fuel supply to the engine crankshaft by changing the position of the plunger relative to the shaft axis driven by the eccentric plunger, the pump casing is rotated relative to the axis of its mounting flange.

, In the drawing, a pump for a four-cylinder engine is shown in longitudinal section.

Shaft / pump mounted on two ball bearings, semi aet rotation through gear 2 from camshaft iiecTepHH

engine with a gear ratio of 4: 1. Thus, the shaft / has twice the number of revolutions compared with the engine crankshaft.

Eccentric 3 removable; It is mounted on the shaft / key.

In order to reduce wear, the eccentric acts on the plunger 4 of the plunger 5 through the ball sub-head 6, pressed onto the eccentric. The force from the eccentric 3 to the pusher is transmitted through the outer ring of the bearing, which does not rotate, but rolls by an amount of eccentricity to one side and the other along the flat surface of the plunger.

To set the proper starting angle for the eccentric, adjusting shims are installed under the detachable bottom 7 of the pusher 4.

Plunger 5 supplies fuel to both axial channels of spool 8 located between its radial channels.

Distribution occurs through the corresponding holes in the sleeve 9 and the spool 8. fuel by four

fittings 10 to which the high pressure pipes are attached to the nozzles.

The fuel is distributed through two radial openings in the spool, independent of each other and with the fuel supply from each to TWO force nakam. This ensures that the individual distribution holes in the distribution system are well insulated, even if there is some wear on the spool and its sleeve.

The assembly of the distribution holes in the sleeve and the spool begins at 70 ° (along the pump shaft) before the theoretical injection pump and continues at an angle of 70 ° after the injection ends,

Roller // spool 8 receives rotation from the shaft / pump through a screw pair with a ratio of 1: 4. Thus, the number of revolutions is equal to the number of revolutions of the engine camshaft.

On the inside of a separate socket, the pump 8 makes it possible in the pump to manage only one injection (discharge) valve 12, which is extremely important for achieving the identity of the injections through the individual nozzles.

The pump body 13 is made rotatable around the mounting flange around the shaft / and fixed relative to the engine plate 14 by means of fastening pins 15 passing through the oblong holes of the mounting bracket. Turning 13 relative to the plate 14 is accompanied by a change in the position of the pump plunger 5 relative to the drive shaft. PL} -zhezha eccentric 3, allows the engine crankshaft to adjust the start time,: i1 iodachi ton.tiva in cylinders pa engine running, :: and provides uniform iodachi fuel in cylinders.

To adjust the uniformity of fuel supply in the section; the first cylinders of the engine, which are necessary due to the inevitable differences in the hydraulic characteristics of the individual forces, were used to replace the long fittings W of the elements that change the volume of fuel in the high-level system. ..l each nozzle. Such an element is designed as having a length of one or another sleeve 16, placed in the fitting of the fuel iodine tube to the cylinder.

The pressure of the fuel delivered to the cylinder such a sleeve 16 does not have a significant effect.

In the pump casing, a centrifugal regulator with free (without hinged) loads / 7, interacting with a fork coupling 18 and a plate 19, is mounted on the shaft. Each of the regulator loads at steady state of rotation has no displacements relative to the coupling 18 and tarp.gki 19. Getting the proper degree of sensitivity of the regulator is ensured by the fact that the weights are completely ;; s in the form of needle bearings in contact with the outer rings of the plate / I internal - with processes of the fork mu (b), covered laterally by end pshybami trenny rings.

The forch clutch 18 of the regulator rotates with the shaft /. The movements of the clutch along the axis of the shaft 1 are transmitted by means of a spring-loaded lever 20 to the toothed rack 21, interacting with the sector 22, turning the plunger 5 to change the amount of fuel supply.

The possibility of regulator rubota in full or partial astatic regimes with a wider range of changes to be set when engine speed is regulated at all times is excluded, since the processes of the forked coupling interacting with the load. 77 are limited inside the surface by an equidistant cylindrical paraboloid}.

Subject invention

Claims (4)

1 A single-plunger fuel pump for multi-cylinder internal combustion engines, equipped with a balanced rotary distributor spool, characterized in that, in order to regulate the delivery time of the top, crankshaft of the engine by changing the position of the plunger relative to the axis of the shaft, the eccentric for the plunger is changed. the pump casing is made rotatable relative to the axis of its mounting flange. 2. A fuel pump according to claim 1, characterized in that, in order to increase the sealing of the spool between the radial channels, the valve is provided with two independent axial channels for supplying fuel, 3, Fuel pump on PP. 1 and 2, characterized in that, in order to automatically control the performance of the pump, a centrifugal regulator is mounted in its housing with free (hinge-free) shakes, made in the form of needle bearings, with outer rings of interacting with the plate fixed on the drive roller of the pump, and internal through the end washers with the fork arms, also mounted on the pump drive roller. 4. The shape of the pump outflow / pumping unit according to claim 3, characterized in that, in order to prevent the controller from operating in full or partial astatic modes with a wide range of changes that are installed with all-mode regulation of the engine's nominal speeds, interacting with the weights of the fork shaft process outlined along an equidistant cylindrical paraboloid.