REDUCING CRANKSHAFT TORSIONAL VIBRATION.
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A 116sum6 of Recently Published Patent Specifications.
"El W. LANCTMSTER and E. C. S. -12 • Clench (Aster Engineering Co., Ltd.) are responsible for a development of Patents 21,138-1910 and 3,6821911 for eliminating vibration. In the . present case the idea is to fit a heavy ring to one of the webs of an engine crankshaft farthest from the flywheel, which is said to act as a damper for torsional vibrations that might occur to crankshafts not so fitted.
It will be seen from the illustration that the heavy ring is not rigidly
attached to the web of the crank, but is induced to revolve with it by means of the friction set up between a number of discs, as in a multi-disc clutch. The web of the crank between two of the throws is made in the form of a disc. On the edge of this disc a number of teeth are formed of suitable shape to engage the discs which form one-half the number necessary to form a clutch.
An outer ring is provided with in ternal teeth, which engage those discs which are not in engagement with the crank. A number of springs supply the necessary friction by pressing the discs together.
An outer ring, provided with grub screws,. holds the members together, as shown. The device is said to be particularly useful when applied to sixcylindered engines, but may be used with success on a four-cylindered engine.
Improvements in the Manufacture of Cylinders for Internalcombustion Engines.
THE Fiat Co., of Italy, describe in their specification No. 224,541 a new method of making cylinders of steel castings and of case-hardening the interior surface so that it will better resist wear. It is claimed that much thinner internal walls can be used than when cast-iron is employed. The result of this would be a better transmission id heat from the interior to the water in the jacket, which at present, with the comparatively thick cast-iron walls, Is not very active.
One cannot help feeling admiration for any firm who will embark on a method of manufacture in which so
C2A many difficulties may be anticipated. The casting of cylinders even in iron has proved difficult enough, and the casting of even simple articles in steel has never been looked upon as child's play.
To add to the difficulties, this company proposes to case-harden the interior! Were the specification lodged by any firm of less repute, we should have attached but little importance to it. As to the superiority of a cylinder produced in this way, there can be no doubt, provided the production is not attended with so many difficulties, that the price, even for this very muchimproved form of cylinder, becomes prohibitive.
An Improved One-piece Cage for Ball Bearings. IT is now fully recognized that better results are obtained from ball bearings when the balls are separated by means of a cage, excepting iri the smaller sizes, such as those used for magnetos. H. Sibbering Wood and Rudge-Whitworth, Ltd., describe in their specification No. 227,974, a new form of onepiece cage for ball bearings.
Efforts have been made, from time to time, to produce a cage which is formed from one piece of metal, some of which have proved highly, satisfactory. It is
obvious that such a cage must have some means of securing it in its place, and this is the object of this invention.
The cage is made with three of its holes formed so that they completely encircle the balls, as shown in the left=hand view at (A) and (B). These holes are evenly disposed round the ring.
All the other holes are formed in the shape of a " U " so that balls can be inserted when the cage Isin place. The method of assembly is as follows :---Two of the balls are put in the complete holes and inserted in the race while the ring is in a tilted position as shown in the centre figure. By this means the third ball can be inserted in the last complete hole, and pressed into its place by means of the filling slot (0). The cage is then in its place with three evenly disposed balls supporting it. The rest of the holes being open, it is easy insert the balls through the filling slot in the usual manner ; the three balls in the complete holes prevent the cage from moving sideways.
A New Gastight Piston Ring.
ADOLF STERN, of Czecho-Slovakia, describes in specification No. 229,245 a new form of interlocking end for piston rings, which it is claimed will maintain a gastight abutment even if there should be a slight variation in the bore of a cylinder. The upper view shows a plan, the centre sketch is an 'elevation, • whilst the lower one is a perspective view.
It will be seen that a portion of the ring where it is cut away is parallel to the outer surface, as shown in the upper view at A. When in place in its cylinder, the parts (A) contact with each other, so forming a gastight joint, even if the bore of the cylinder should vary in diameter within certain limits.
Tipping Body to Carry Containers.
A FORM of tipping body for carrying
containers such as those used for street refuse, etc., is shown in specification No. 229,723, Walker Bros., Ltd. (Wigan). This is the well-known method adopted in Southport. The specification shows a long body, the rear end of which reaches the ground when tinned, so as to form an incline up which a container can be hauled.
When the container is in place the body can be brought to a level position. No new features are described