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Lubricating the Dry Side of the Cylinder

17th November 1944
Page 36
Page 36, 17th November 1944 — Lubricating the Dry Side of the Cylinder
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Which of the following most accurately describes the problem?

A Risme of Patent Specifications That Have Recently Been Pub fished CYLINOERS lubricated by oil thrown up from the crankshaft always receive more oil on one side than on 'the other, irrespective of the piston rings employed. To even up this state of affairs is the object of a scheme shown in patent No. 564,150, by L. Gardner and Sons, Ltd., and others, Barton Hall Engine Works, Patricroft, Manchester,

Use is made of the fact that the small end of the connecting rod is pressure-fed with oil, and some of this is allowed to escape and is directed towards the dry side of the cylinder. The drawing shows the scheme in operation; oil from a jet (1) in the small-end is directed on to the cylinder wall through a port (2) specially cut in the piston. The rebounding oil may also be used to assist in cooling the piston, in which case the central fins (3) would be provided.

A DUAL-PRESSURE HYDRAULIC CYLINDER

AN hydraulic master cylinder which gives a low-pressure thrust for moving the shoes, followed by a higher pressure for the braking action, is shown in patent No. 564,097, by Bendix Aviation Corporation, South Bend, Indiana U.S.A.

Two pistons are provided—a large one (1) for -the low-pressure stroke and a smaller one (2) for the high-pressure. Both work in unison When rod 3 is pushed by the driver's pedal. In the first part of the stroke, fluid from the large cylinder unseats a one-way valve (4) and passes into the smaller cylinder, whence it escapes past valve 5 into the pipe-line (6). When the pressure has risen to a certain value, it unseats a blow-off valve (7), and the large cylinder then discharges back into the reservoir. Any further movement

IMPROVED RUBBER-MOUNTED ' FLEXIBLE JOINT

AFLEXIBLE coupling, employing rubber for the intermediate member, forms the subject of patent No. 564,215, from Metalastik, Ltd., and M. Goldschmidt, both of Evington Valley Road, Leicester. The object is to produce a joint. that will offer a low resistance to small deflections, but one which will increase with the load. To this end, small loads dare dealt with by rubber in shear, but, with an increas

ing load, the 'rubber is gradually

'brought into a compressive stress.

The.clrawing shows one way of embodying the basic principle; in this case the inner unit is fitted with two lobes (1), whilst the outer member is ber tries to turn relatively to the other. II. however, the angular motion becomes large the lobes (I) attempt to !` squeeze out " the thick part of the rubber, an action which is compressively resisted.

In addition to its usefulness for a shaft coupling, the device is said to be also suitable for torsional vibrationdampers and torsional springing.

WHEEL NUT PROVIDING INCREASED FRICTION WHILST the wheel-holding nuts of a VII vehicle are usually coned or sphered to increase the area of grip, it is still not unknown for them to work loose, and an additional safeguard against this forms thesubject of patent No. 564,228, from F. Berry, W. quilter and J. Wilkerson, Ley Green, Kings Walden, Herts. It is proposed to cut radial slits (1) in the pressure side of the nut, so that when it meets the wheel recess the nut is pressed inwardly, and firmly grips the thread of the stud.

OIL PUMP WITH LAMINATED GEARWHEELS

THE gear pump as used in lubricating systems has to be made with considerable precision, both in respect of diameters and lengths, if leaks are to be avoided, and a pump which will work well without the need for close limits is shown in patent No. 564,235, by Equi-Flow Inc., New York, U.S.A.

The chief novelty lies in the use of stamped laminations for building up the gears, a scheme which lends itself equally to the production of straight or helical gears; a pump of the latter type is shown in the drawing The driving laminations (1) are

all keyed to the shaft, but the driven ones (2) are freely mounted so that they can adjust themselves to slight errors. The ends are hydraulically sealed, recesses (3) being loaded by the output pressure. The patentee states that the laminations may be used straight from the press, and as no precision-finishing operations are necessary. manhours are saved both in machining and assembly


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