Handbook of Machine Design P3

Ngày tải lên: 23/10/2013, 18:15

... somewhere along the line of action ab. Because of the nature of this tooth action, usually one or two pairs of teeth in contact, a useful criterion of tooth action, called the ... initial point of contact; b, final point of contact. Line aPb is the line of action. Point a is the initial point of contact. This point is located at the intersec...

Ngày tải lên: 20/01/2014, 01:20

... integral number of pitches. An even number of pitches is preferred. An odd number of pitches requires the use of an offset link, and offset links reduce the capacity of the chain. Wear ... type of lubrication can drastically reduce the life of the drive. Direction of Chain Travel The wear life of an offset sidebar chain can be affected by i...

Ngày tải lên: 20/01/2014, 01:20

... Drive of a hobbing machine. (Siegling.) FIGURE 31.17 Tangential belt drive of a textile machine. (Siegling.) FIGURE 31.18 Section of a V-belt and sheave. The known form of Eytelwein's ... safety, since the probability of sudden failure of a complete belt set is very small. The uniformity of initial tensions and speed ratios of all belts...

Ngày tải lên: 20/01/2014, 01:20

... with a mass of 140 grams (g). A coefficient of friction /= 0.3 can be achieved. The inner diameter of the drum is 75 mm, and the radius R to the center of gravity of each shoe ... pads e Angular position of actuation force, deg 0 Angle of wrap, deg 0 Angular position, deg 01 Starting position of brake shoe lining, deg 0 2 Ending position of...

Ngày tải lên: 20/01/2014, 01:20

... are of equal size and mass, the sum of all link forces is zero, resulting in smooth opera- tion without imposing side loads. 29.6 METHODS OF^ TT^OflVffiWT There are several methods of ... transmission, and the transmission of shock through the system. A tradeoff between these effects is made in the final design. Alternatively, thick blocks of mate- rial...

Ngày tải lên: 20/01/2014, 01:20

... presented in the form of various design charts for LID ratios of 1 A, 1, and 2. Figures 28.21 to 28.23 are a sam- pling of these charts for an LID ratio of 1. A porous journal ... general approximate method of design that does not require the use of various design charts. The method is strictly valid for thin land bearings, and many of the pa...

Ngày tải lên: 20/01/2014, 01:21

... parameter 28.1 INTRODUCTION The design of journal bearings is of considerable importance to the development of rotating machinery. Journal bearings are essential machine components for com- pressors, ... axis are termed offset bearings (Fig. 28.3J). The relative displace- ment of the center of each half of the bearing is called the preset. When the...

Ngày tải lên: 20/01/2014, 01:21

... Period of cyclic variation, rad 27.7 INTRODUCTION Figures 27.1 to 27.12 illustrate something of the terminology and the wide variety of rolling-contact bearings available to the designer. ... bearing with machined race. Note the absence of an inner ring, but standard inner rings can be obtained. (McGiIl Manufacturing Company, Inc.) FIGURE 27.2 Photograph of a...

Ngày tải lên: 20/01/2014, 01:21

... asbestos- filled: Soft aluminum Soft copper or brass Iron or soft steel Monel or 4-6% chrome Stainless steels Grooved metal: Soft aluminum Soft copper or brass Iron or soft steel Monel ... with soft filler. Multiple sealing surfaces. Seating stress decreases with increase in pitch. Wide varieties of designs are available. Interleaving pattern of metal and filler. R...

Ngày tải lên: 20/01/2014, 01:21