DE379159C - Double-acting charge air pump - Google Patents

Description

Double-acting charge air pump. The invention relates to a double-acting Air pump for double-acting explosion engines, medium :; which one at will on the one hand, low-pressure air for (read sweeping and loading the '-llotorzvlinder and on the other hand, high-pressure air can be generated for starting the engine.

The drawing shows an embodiment of the invention.

Fig. I shows a longitudinal section through the pump cylinder, Fig. 2 also a longitudinal section, which is offset by go ° to Fig. i, Fig. 3 the control cam i2 '.

The pump piston i is designed in the manner shown, and the lower compression manifold 2 has a suitable bottom 3. The inlet pipe 4 and the outlet holes 5 are arranged twice, as are the control slides 6, 7, the suction lines 8, () and the pressure lines io , i i. Each of the control slides 6.7 is controlled by correspondingly designed cams 12, 13 .

The cams 12 and 13 are arranged on a shaft 14 which is driven by the crankshaft at half its speed. each cam has an upper running surface 12 or 13 and a lower running surface 1 2 'or 1 3 . The upper running surfaces 12, 13 each have two symmetrical projections h (Fig.3). The cam surfaces 12, 13 are only used when the pump is double-acting and only generates low pressure air.

The cams b act twice on the slides 6 and 7 during one revolution of the shaft 1d .. These slides receive in some way a reciprocating movement with the same number of strokes as the pump piston. The double mode of action for generating low-pressure air is as follows: on the downward stroke of the piston i, when the end of the control lever leaves the resting surface (a or c of Fig. 3) of the nokkens i - #, the slide 6 and opens the suction holes d., which are in communication through the line 8 with the outside air, while on the upward stroke of the piston i, in that one of the projections b comes into effect, the slide V goes downwards and the pressure holes 5, which through the line io with your not depicted low-pressure air tank are in connection, releases. I: if the movements of the piston and the slide occur in the same number, the same sequence of movements takes place with each piston stroke. The slide; is controlled by the cam 13 in the same way. The pump thus works double-acting, which mode of operation is particularly suitable for aircraft engines when they are to work in higher layers of air. When the pump operates in this manner, only the upper running surfaces 12, 13 of the cams control and the pump delivers only low pressure air.

The cams i2, 13 are, however, arranged displaceably on the shaft 14 and have additional ramps 12 ', 13' by means of which the slides are controlled so that either low pressure alone or alternately low pressure air and high pressure air is generated, with the lower side of the piston completely - is turned off.

The single effect with the generation of low pressure alone is achieved, when using the cam surfaces i2 and 13 ', the lower slide 7 is not controlled while the upper slide 6 is controlled by the upper running surface 12. The lower slide 7 is then in the position shown, with the lower cylinder space through the opened channels d. is in contact with the outside air.

The lower slide 7 remains at rest if there is no projection having cylindrical ramp 13 'in contact with the control rod of this slide brings. The simple effect of mixed gear takes place in the following Wise instead: There is low-pressure air in one piston high gear and the other Piston upstroke generates high pressure air. This is done using the cam surfaces 12 'and 13' achieved by making the lower slide 7 immobile and the upper slide 6 gives such a movement that in the one upward gear the entry hole 5 is not opened. For this purpose: owns the lower running surface or ramp 12 '(Fig. 3) of the cam 12 has a normal projection b and a second Projection d of small height (see Fig. 3). Since the wave 1d. at half speed the motor shaft is driven, the normal projection b causes the slide performs one full movement during one piston up stroke while the second Projection d in the following piston upward gear the slide 6 a reduced Movement granted. During this movement the suction opening 4. is closed, however, the pressure channels 5 are not opened. Since now the air is no longer through the () opening 5 to the vacuum tank can escape, it is compressed, the highly loaded valve 17, which leads to the high-pressure container, not shown leads, is raised.

The movements of the piston and the slide 6 take place in the following Way instead of: 1. During the downward stroke of the piston i, the rest position part a of the cam comes 12 '(Fig. 3) to the effect, the slide 6 is in its highest position, where the channels .l. open «-ground. With this movement, air is drawn through the ducts 4. sucked into the upper part of the cylinder.

2. Upward stroke of the piston 1. It is the normal projection b of the Cam engaged, the slide 6 descending and the channels 5 exposed through which the low pressure air through line 1o to the low pressure air tank escapes.

3. On the second downward stroke of the piston 1, the rest position part c comes of the cam to the effect and the channels d. are opened again because the slide has returned to its upper position. This part of the movement corresponds to a further suction.

On the second upward stroke of the piston 1, the projection d comes from: less Height to the effect and the slide only lowers by an amount, which is sufficient to cover the inlet channels: but with the outlet channels 5 remain closed so that the slide assumes the position shown in Fig.2 is. Since the air cannot escape, it is compressed and lifts that loaded valve 17 which leads to the high pressure container.

Finally, using the cam surfaces 12 'and To work in this way, the older cylinder side is exposed to the action of the tread 12 'alternately supplies low-pressure or high-pressure air, while on the lower Low pressure air is always generated on the cylinder side.

The transition from one way of working to the other takes place through Adjustment of the cams 12 and 13 such that those ramps are used which correspond to the required mode of action; this can be known to any Way to be achieved. For example, in Fig. 1, the shaft 1.4 is in a Guide shown longitudinally displaceable, the cam 12 in turn on the hollow 1.4 shaft can be moved under the action of the inner rod 15. The transfer the movements of the cams 12 and 13 on the slides 6 and 7 can be at any Wise done.

It should be noted that the device according to the invention is the engine gives greater adaptability for working at different air heights, by placing the pump on simple action or the mixed in the lower layers of air Gear, while in higher air layers one has the double effect and the can achieve required overpressure.

Claims (1)

PATENT-AH spRU c H: Double-acting charge air pump for double-acting explosion engines in which the suction and pressure channels as well as the control slide and the control cams are provided twice, characterized in that each of the two control cams has two ramps which control the slide so that one Slide remains immobile and the other works in the normal way, or that one slide remains immobile and the other alternately exposes the pressure channels 5 and keeps them closed with every I, piston upward gear, the air being compressed to a sufficiently high pressure around a loaded valve to open, which leads to the high pressure container.