SU1663205A1 - Oil pump for two-stroke internal combustion engines - Google Patents

Abstract

The invention relates to mechanical engineering, and more specifically to micro-dosing devices of separate lubrication systems of two-stroke internal combustion engines. The pump has a simple design and allows to increase the stability and accuracy of microdosing. The oil pump includes a housing 1 in which a driving roller 2, a driven distributor 3 are placed, in the axial opening of which a plunger 17 is placed, floating between two stops with a regulating device. The inlet channel 9 is in communication with the discharge channel (4, 5) through the radial holes 10 with the screw screw thread 11, which enters the worm gear 12 with the spool sleeve 3. 1 Cpf-ly, 2 Il.

Description

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The invention relates to mechanical engineering, in particular to microbatching devices for the separate lubrication system of two-stroke internal combustion engines.

The purpose of the invention is to increase the stability and accuracy of microdosing.

FIG. 1 shows an oil pump for a two-cylinder internal combustion engine, longitudinal section; in fig. 2 is a section A-A in FIG. one.

The pump includes a housing 1, in the cylindrical bores of which the driving worm roller 2 and the driven distributor 3 are placed, the discharge channel (4, 5) and the discharge channel 6 with a check valve 7; The channel (4, 5) through the pressure reducing valve 8 communicates with the inlet channel 9, and the channel 6 through the check valve 7 with the engine. The roller 2 is made hollow, and the inlet channel 9 is made in the housing coaxially roller,

and in the latter there are radial holes 10 in front of the engagement zone with the distributor 3.

The channel 9 through the holes 10 communicates with a screw thread 11 entering from the gear teeth 12 with the segment cutting 13 of the distributor 3. The axial hole 14 of the distributor 3 is connected by radial channels 15, 16 in the distributor 3 with channels 4 and 6. In the hole 14 there is a floating plunger 17 between the stops 18, 19, the stop 18 being fixed relative to the pump casing, and the stop 13 is in contact with the regulating device. The channels 15.16 in the distributor are designed so that their axes are perpendicular to the axis of the plunger and are offset relative to the plane passing through the axis of the worm roller. At the ends of the plunger 17 and interacting with it, the ends of the stops 18,19 are grooved, shaped

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interlocking overhangs and valleys. Worm roller 2 is provided with a lip seal 21.

Oil pump works as follows.

The oil through the channel 9 and the radial holes 10 of the worm roller 2 enters the helical screw cutting 11 in the gearing zone 12. The gear segment cutting 13 cuts off the oil in the screw thread of the screw cutting 11, moving the oil into the feed channel (4.5) pressure in which is maintained by pressure reducing valve 8. Oil from channel 4 through radial channel 15 enters axial bore 14 between stop 18 and floating plunger 17, which, moving up to stop 19, displaces oil dose through radial channel 16 , check valve 7 and outlet can al 6 to the internal combustion engine. After rotating the distributor 3 at 180 ° C, the cycle repeats, but in reverse order. Oil is fed through the radial channel 16 and moves the floating plunger 17 from the stop 19 to the stop 18, displacing a dose of oil through the radial channel 15, the check valve 7 and the exhaust channel to the engine.

The oil dose is set by the regulating device 20 and is determined by the size of the gap between the lugs 18, 19 and the plunger 17. The floating plunger non-rotating relative to the body and the two stops prevent them from hanging even with slight pressure drops, thus ensuring the stability of microdosing.

The proposed oil pump has the simplicity of a constructive solution. It lacks both the cam drive parts and the parts of the injection pump. The oil pump is in the process of long-term

The results showed reliability and high stability of microdosing.

Claims (2)

1. An oil pump for two-stroke internal combustion engines, comprising a housing, in cylindrical bores of which a lead worm roller and a distributor communicating with it with notched cuts on its supporting cylindrical surface are placed, a plunger installed in the bore of the distributor with the possibility of limited movement, inlet, discharge and discharge channels, characterized in that. In order to improve the stability and accuracy of microdosing, the inlet channel is made coaxially in the housing of the worm roller, the latter is made hollow and provided with radial openings in front of the zone of engagement with the distributor, the teeth are cut into segments according to the outer diameter of the roller and are located In this way, the inlet channel is connected with the injection through radial holes in the roller and gearing, and in the distributor channels are made whose axes are perpendicular the plunger axes and are displaced with respect to the cavity passing through the axis of the worm shaft in opposite. good sides. 2. Pump according to Claim 1, characterized in that the plunger movement stops are made in the form of stops, one of which is fixed relative to the housing, at the ends of the plunger and the ends of the stops corresponding to them are grooves forming mutually compatible projections and depressions. / 2O