. Automotive industries . d oil will research still remains to be done before workablespecifications for lubricating oil for any particular pur-pose can be written. Chase Discusses Clutches The third paper scheduled at this session was presentedby Herbert Chase, the title being Practice and Theory inClutch Design. This paper will be printed probably infull in an early issue of Automotive Industries. Inopening the discussion, Chairman Crane said that ourclutches are required to accomplish two very antagonisticthings. Owing to the fact that the clutch must be re-leased for brief moments
. Automotive industries . d oil will research still remains to be done before workablespecifications for lubricating oil for any particular pur-pose can be written. Chase Discusses Clutches The third paper scheduled at this session was presentedby Herbert Chase, the title being Practice and Theory inClutch Design. This paper will be printed probably infull in an early issue of Automotive Industries. Inopening the discussion, Chairman Crane said that ourclutches are required to accomplish two very antagonisticthings. Owing to the fact that the clutch must be re-leased for brief moments in order to permit of shiftinggears, it is necessary that the spinning weight of thedriven element be as small as possible; while, on the otherhand, the clutch must be sufficiently large to hold underthe maximum load and also not wear excessively undernorma] slippage. It is the spinning weight problem thatmilitates against the cone clutch, as the cone clutch, hav-ing only a single friction surface, must be of large diam-. eter. One well-known foreign car that he knew of hasa cone clutch that made it almost impossible to shift froma higher to a lower gear without what is known as doubleclutching; that is, disengaging the clutch and, after aslight interval, bringing it into engagement again for aninstant. There is also much misunderstanding of the realfunction of the clutch brake. A clutch brake is of no serv-ice in changing from a higher to a lower gear, as in thatcase the clutch needs to be speeded up rather than re-tarded. Crane had a good word to say for the singleplate clutch with lubricated asbestos lining. More than100,000 miles of service of such a clutch had resulted inno appreciable wear. Prof. Lay said that another pair of conflicting require-ments was that in hard pulling you want the clutch tohold without slipping, while, when first engaging you wantit to slip, but Crane thought this requirement could easilybe met by suitable arrangement and handling of the con-trol
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectaeronautics, bookyear
