SU67207A1 - Starter for starting the engine of an aircraft - Google Patents

Description

Mobile starters for launching aircraft engines are already known, incorporating a drum coupled to the engine shaft and driven by the tension of a rubber cord. The disadvantages of these devices are: first, the fact that they have constant torque, making them suitable for only one type of engine, secondly, they require great effort and a lot of time to charge them, and finally do not have mechanisms that allow the starter to be prepared for launch in advance.

The proposed starter for starting engines of airplanes also has a drum coupled to the engine shaft and driven in rotation by tension of springs or rubber cords, but structurally it is made differently and does not have the disadvantages inherent in the known structures.

The drum to create the possibility of varying the torque is made multi-stage. To facilitate the tension of the shock absorbers, the drum is connected via a gearbox to the shaft of the gear wheel, driven during charging during rotation.

with the hands or weight of the service person, and when the drum rotates at the moment of launch, which increases the torque, due to inertial forces. To enable braking of the steering wheel after starting the engine and fixing it after charging the starter, a brake pad and a rotary stop, controlled by a cable and a handle, are used.

In FIG. 1 depicts a starter, rear view; FIG. 2 is a plan view; FIG. 3 is a side view of FIG. 4 - stop and brake mechanisms; FIG. 5 - drum and gearbox, shown on a larger scale.

The starter is made in the form of a welded triangular frame 1 with drawbars 3 attached to it by bolts 28, and with support wheels 13 and 29. Along the base of the frame there are fixed steel twisted strunchy forces or substitute branches of suspension strap 14 that replace them. Springs or branches of the cord 14 through the holder 17 and the cable 15 are connected to the drum 10 of the drive shaft. The drum is made multi-stage, which allows varying the torque in one torque with the same spring tension. The drive shaft is mounted on ball bearings / 8 and on the clutch side is connected by means of a Hook 7 hinge to a clutch pipe 6 having a directional device 4 limiting its pipe deflection and a hitch 5. The pipe 6 has a longitudinal splined clutch with the device 5 located w , it is under the tension of the suspension cord located inside the pipe. The exit from the splines is limited by a cable. The drive shaft is connected to the steering wheel 2 by a gear 8-9. On the axis of the steering wheel 2 is a pulley 27, through which the cable 16 is thrown, connected to a separate spring or shock absorber. The steering wheel cable operates in parallel with the drive shaft cable and provides: a) rotation of the steering wheel at the time of starting the starter when the engine is started and the elimination of deceleration of the gear drive during initial turning of the drive shaft; b) the creation of useful forces of inertia of the steering wheel.

A stop lock, 22, is welded to the frame 1, providing starting of right and left rotation engines. The lock locks the spoke of the steering wheel and is activated by a cable. To eliminate unnecessary rotation of the hand wheel after starting, the starter is provided with a brake in the form of a pad 23 pressed against the wheel rim. The stopper and brake are controlled by a cable 26 slung over the pulley 32, installed in the middle position by the springs 31 and turned by the handle 25. The starter has two wheels on the ground when starting the engine. It is used to finely adjust the clutch 5 of the drive shaft, relative to the ratchet of the screw hub of the engine, by adjusting the angle of the entire structure. For the forerunner: -.:; -R-og pg-Lliro: ;;: starter's height, applied to

or another type of aircraft, there are movable racks 12 with forks / carrying wheels 13, moved in frame sleeves 20 / supported on studs 21.

Turning the steering wheel in one direction or another, turn the drive shaft through a gear. A cable 15 is wound on the drive shaft pulley and connected to the shock absorbers. At the same time, the cable 16 is wound onto the wheel pulley. Having created a maximum force, the wheel stopper and the wheel are ready and the starter is ready to start the engine. The starter is transported to the aircraft, the coupling device 5 is connected to the ratchet of the screw hub and the entire starter is pulled back to the maximum exit of the clutch pipe splines. To start the engine, the lever 25 turns. The shock absorber with the power will go to the original position, rotating the drive shaft and the steering wheel, and with them the engine propeller. After starting, the starter is immediately dropped to the side.

Subject invention

Claims (5)

1. A starter for starting an aircraft engine comprising a drum with a cable wound onto it, one end connected to springs, characterized in that to be able to vary the torque, the drum 10 is stepped and mounted on a shaft driven by rotation of a steering wheel 2 when charging starter. 2. The form of the starter under item 1, characterized in that. that the drive in rotation of the shaft of the drum from the helm is made through the gear 8-9. 3. The form of the starter according to Claim 1-2, characterized in that the helm shaft is provided with a drum 27 for the cable 16 associated with the additional springs. 4. The form of execution of the starter according to claim 1-3, characterized in that the drums, the steering wheel and the springs are mounted on frame 1, wheel-supported and equipped with a drawbar for the possibility of changing the angle of inclination of the drive shaft. 5. The form of the starter according to Claims 1-3, characterized in that for the possibility of braking the handwheel after starting the engine and for blocking the handwheel after charging the starter, the frame / brake shoe 23 mounted on the frame and the rotary stop 22 the help of the cable 26, thrown over the pulley 2, installed in the neutral position with the help of two springs 31 and equipped with a handle 25.