SU58463A1 - Automatic gearshift 2-speed centrifugal supercharger - Google Patents

Description

The invention relates to automatic shifting speeds of a two-speed centrifugal supercharger of aircraft engines using an aneroid box connected to the spool controlling the flow of fluid to the cylinder, the piston moving in which is connected to the servo piston control spool and controlling the gear change lever.

In the proposed automaton, for the purpose of switching reliability and ensuring its sharpness, in order to avoid stopping the blower or damaging its drive, there is an accelerator device, which is integral with the oil distribution valve of the servo gear of the rack coupled to the toothed sector. When the spring axis passes through the sector axis, the spring reaches the greatest tension and dramatically sends the sector in the direction of its rotation.

The drawing shows a schematic diagram of an automatic gearshift.

Aneroid box / with automatic device sensing element.

enclosed in a chamber communicating with the atmosphere. The fall of the external pressure, as the plane rises to a height, causes the box to lengthen, accompanied by moving down the hinged spool 2, hinged down. Using the adjusting bolt 5, box 1 is set so that, with an external pressure corresponding to a given height, the lower spool 2 begins to open access to the channel 5 to the oil coming under pressure from channel 4. Then the piston 6 will begin to move to the right, compressing the spring 7, and the pin 8 will also shift the oil distribution to the right 9 servoporschn Tel'nykh spool 21, the control rychagol switching speeds,

For an integral whole with the spool 9, a gear rack 10 is engaged, meshed with the gear sector, //. The movement of the spool together with the rail to the right causes the sector to turn about axis 13 counterclockwise, which is accompanied by stretching of the spring 12, reaching a maximum when points 13 (sector axis), 14 and 15 (axis

springs) are on the same line. This position takes place almost at the end of the stroke of the piston 6. With further movement of the piston 6 and the spool 9 with the rail 10, the spring 12 tends to shorten and turn the sector //, as a result of which the rail and the spool are sharply sent to the right to the stop due to the free stroke It is between the stem 5 and the stop surfaces 16 and 17 of the spool 9. In the position shown in the diagram, the oil under pressure from the channel 76 is bypassed into the channel 19, and the servo piston 21 is pressed to the far right position. When the spool .9 moves to the right, the oil from channel 18 will go to channel 20, and channel 19 will be connected to drain channel 22, and servo piston 21 will go to the left by activating the second speed.

When the aircraft is lowered to a predetermined switching height, the aneroid valve 2 will move up and allow the spring 7, displacing the oil through channel 5 to discharge 24, advance the piston 6 with the rod 8 and the valve 9 with the rail 10-left, and, similarly to the above, the spring 12 sends the spool 9 to the left until it stops, with the result that the servo piston moves to the extreme right position, turning on the first speed.

The purpose of the acceleration mechanism (piston, rail 10, sector 11, spring 12} is to provide sharp switching in order to avoid stopping the blower or damaging its drive.

Between the spool 9 and servo piston 21, a manual control valve, not shown in the diagram, is placed, allowing, regardless of the height of the flight, to switch on a particular speed, depending on the pilot's desire. The same valve is used to control the kicker in the event of an automaton failure.

The subject matter of the invention.

A two-speed centrifugal supercharger speed selector using an aneroid box connected to a spool controlling the flow of fluid to a cylinder, moving a piston connected to a servo piston distributor, which is different in application for the reliability of switching, an accelerator device consisting of a toothed rack 10, the toothed sector // and the spring attached to it / I intended for the passage of its axis 14-15 through the axis 13 of the sector to sharply send the sector in the direction of its rotation no.

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