AT THE HEART OF THE ROAD TRANSPORT INDUSTRY.

Call our Sales Team on 0208 912 2120

Hydraulic-cum-Mechanical Transmission

11th June 1954, Page 102
11th June 1954
Page 102
Page 102, 11th June 1954 — Hydraulic-cum-Mechanical Transmission
Close
Noticed an error?
If you've noticed an error in this article please click here to report it so we can fix it.

Which of the following most accurately describes the problem?

A TRANSMISSION system employ ing two automatic clutches, a torque converter and a two-speed gear, is disclosed in patent No. 707,259 (F. Kreis and Societa Italiana Brevetti Automobilistici a.r.1., 19 via Domodossola, Milan, Italy).

In the drawing, 1 is the engine-driven casing of a pair of automatic centrifugal clutches, the casing driving also the input impeller (2) of the torqueconverter. One driven clutch-member is fixed to the output shaft (3), which runs right through the assembly, the other being attached to a hollow shaft (4). The output member of the torqueconverter is also fixed to this hollow shaft, either direct or through a free wheel. If a free wheel be fitted, it is made lockable for braking by means of a dog-clutch (5). The hollow shaft terminates in a gear (6), which drives the layshaft of a twospeed gear. Both speeds are permanently engaged, overrunning being permitted by a free wheel (7). Reverse can be obtained via a pinion (8). In operation, the torqueconverter starts the vehicle and as soon as a certain speed is reached the first clutch automatically engages and drives via the lower gear. When the speed rises further, the second clutch takes over and provides a direct drive, the free wheel . allowing for the overrun.

The torque-converter can, and GlOtA, take up the drive in the intermediate positions whenever it can give a better output, but the free wheels prevent it from being needlessly driven and setting up a retarding force.

706,789 A COMPACT SERVO-MOTOR FOR HYDRAULIC BRAKES

PATENT No.ra 707,232 refers to 1 braking systems employing a large, air-operated servo-cylinder to work a ra small hydraulic slave cylinder which works the brakes. The scheme shown combines the two units in the same casing. The patentee is Thomson and Taylor (Brooklands) Ltd., Broaklands Track, Weybridge, Surrey.

a36

Referring to the drawing, a cylindrical casing houses the air piston (I), which is suction operated. An evacuating connection is attached to point 2, whilst atmospheric air can be admitted through end 3 to operate the piston. Partition 4 is perforated to permit air to pass through it. The slave cylinder (5) is mounted centrally and is supported by the partition. The piston-rod (6) is coupled to the hydraulic piston (7) and normally provides the working thrust. As a reserve measure, a pipe connection (8) from the master cylinder can work the brake without additional power by applying hydraulic pressure to the back space 9. Another important advantage of the scheme is that the space round the oil cylinder serves as an air reservoir, thus dispensing with a separate container.

FULL PROTECTION FOR A DISC BRAKE

ADESIGN covering a disc brake in which the disc is totally enclosed is shown in patent No. 706,789 (Dunlop Rubber Co., Ltd., 1 Albany Street, London, N.W.1). As shown in the drawing, the stationary disc is wedge-shaped in section and the ends of the friction pads (1) are bevelled to suit. T h e similarly shaped drum is made of steel, but has a series of aluminium fins (2) cast thereon. The drum is provided numerous slot with nus (3) which, in conjunction with the fins, set up a vigorous centrifugal air pumping action through the interior to keep the disc cool.

A COMBUSTION HEAD FOR OILENGINES

AN improved combustion head for oil engines is disclosed in patent No. 708,371, by Societe d'Etudes de Machines Thermiques, 24-26 rue de la Gam, La Courneuve, Seine, France. A

pre-combustion chamber is incorporated, and the patent deals with certain details of it. The chamber is formed by a bore in

the cylinder head, and a nose-piece is nserted so as to project into a recess in the piston at top dead centre. The nose consists of a taper-bored plug provided with radial holes (I). Inside the bore is a slotted core (2), which is threaded on its bottom tail and is firmly pulled down into the taper by a nut (3). This core-piece receives the hot blast from the overhead injector and serves to protect the nose itself from the destructive effect of the hot gases and the thermal distortion which would thereby be caused.

A NEW REFUSE-COLLECTING BODY

FROM Glover, Webb and Liversidge Ltd., and L. Evans, both of 561 Old Kent Road, London, S.E.1, comes patent No. 707,317, dealing with the construction of refuse-collecting bodies. The patent covers a method of using the rear door as a means for compressing the load. The left-hand drawing shows a view of the door in the normal position with a heap of refuse that has been loaded through upper openings. A pair of hydraulic rams (1) located near the roof can be used either to pull or to push a pair of arms (2). These are pivoted about points 3 and carry the rear door. If the rams push the arms, the door is rocked into the position shown in the right-hand drawing, forcing the refuse into the interior of the body. Its return is prevented by prongs (4), which retract during the compressing operation, as shown at 5. If the rams are used to pull, the door is opened wide for discharging by tipping. In these circumstances, the pivot points are changed to those shown at 6 in order to gain height.

Tags

Locations: Milan, Surrey, Seine, London

comments powered by Disqus