Rotary Motors In Hydraulic Transmission Scheme
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A Resume' of Patent Specifications that Have Recently Been Published
ALL HYDRAULIC transmission forms the subject of patent No. 528,408 from F. Rayer and G. Bethell, respectively, of 66 and 326, Chester Road, Castle Bromwich, Birmingham.
The scheme employs a master pump driven by the engine, and piped to an hydraulic motor on each of the four road wheels. The pipe circuit forms the only connection between engine and wheels.
In the accompanying illustration is seen a section of the prbposed hydraulic motor. The rotary portion consists of a disc fitted with three radially projecting vanes (3) and having thin arcuate flanges (2) extending circum ferentially on the disc for about half the distance between the vanes. The
disc is externally geared at a three-toone ratio to a pair of spindles (1). Each spindle carries a small disc (4) which is notched to mesh with the vanes (3) on the central disc.
Oil under pressure arrives via ports (5) which are controlled by the flanges (2) on one side of the rotor, the oil exerting its pressure on the increasing space between the vanes (3) and the disc (4). When this space is contract 'ing, the oil leaves via -discharge ports (6), controlled by similar flanges on the other side of the rotor. The general action is similar in principle to the ordinary gear-pump. Spring-loaded valves (7) are embodied to release any fluid that may be trapped in the change-over.
By throttling the discharge passages from the motors, it is possible to provide a simple braking system.
PRODUCER GAS FROM WOOD OR OTHER VEGETABLE MATTER
APRODUCER using as fuel wood, peat, straw or other combustible vegetable matter is described in patent
No. 528,284 by G. Donald, Dragon Farm, Long Crendon, Aylesbury, Bucks. As the inventor states, attempts to use this type of fuel usually cause damage to the engine, • valves, etc., owing to the tarry and acid nature of the gas, but the present design is claimedto overcome this by " crack lag" the gas and so changing or burning the unwanted ingredients.
Referring to the drawing, the body has an .outer casing and an inner fire-bowl (2) fed with fuel from a closed hopper above. The fire-bowl is fitted with a partition (3) which supports the fire. The fire body is pentagonal and is fitted with five tuyeres (1), one in each . corner. The tuyeres are supplied with air from a belt (4) surrounding the fire zone. Stress is laid on the fact that each tuyere is opposite a side of the bowl.
In action, the highest combustion temperature is attained about the central bore in the plate (3), and as all the gas has to pass .through this region, the unwanted ingredients are broken up. The air and gas flows are clearly, indicated by the arrows. Considerable importance is attached to the polygonal design, it being claimed that this definitely prevents the passage of tars. etc., which have not been subjected to sufficient heat to change their nature.
In the space between the fire bowl and the casing is packed broken charcoal, which is maintained at red heat, and has a further reducing action on the gases, whilst also keeping up the heal: • of the fire bowl and pre=heating the ingoing TRACTOR WHEEL FOR RUNNING ON RIDGETOPS NABLING a tractor to run on the of potato or other ridges is the object of a special wheel shown in patent No. 528,572 by David' Brown Tractors, Ltd., Park Gear Works, Lockwood, Huddersfield, and C. Belton, Eastoft, near Scunthorpe.
To the periphery of a Wheel-disc (2) is attached' a series of bent strakes (1) so as to form virtually a concave tread which is sufficient to maintain the vehicle on the ridge tops. The strakes are positioned alternately on the left and right so that no clogging can occur. When it is desired to run on level surfaces they can be reversed and attached to the disc as shown in dotted lines at 3.
TWO-STROKE WITH FUEL INJECTION AND SPARK IGNITION
THE name of H. Ricardo, 21, Suffolk Street, London, SW.], is associated with advanced engine design,; and in patent No. 527,903 are shown his latest suggestions. The patent discloses a design for a.two-stroke engine operating with ,fuel injection, but employing spark ignition. The type of -fuel is not mentioned, but the compression ratio is given as being 7 to 1.
An accompanying drawing shows the combustion chamber and valve arrangements, these forming the basis of the patent. A single-sleeve valve is used, through ports in which the charging air enters from an annular chamber (2), the exact timing, however, is governed by the descent of the piston.. The exhaust is discharged out of ports
(3) in the upper part of the cylinder, the timing in this case being effected entirely by the top edge of the sleeve.
The combustion chamber (1) is situated on the cylinder axis, and although shown -in bulbous form, may alternatively be conical. The injector (4) is arranged to give an axial spray which avoids contact with the chamber walls. A pair of sparking plugs is located in the combustion chamber, one of which can be seen end-on in the drawing. The injection pump is regu lated so that the termination of injection is the same for all loads; in other words, the larger the quantity, the earlier injection commences. The patent also describes a means for controlling the pump in accordance with the air pressure; this is to maintain a constant strength of mixture,