Elements of MechanismJ. Wiley, 1905 - 280 pagina's |
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Veelvoorkomende woorden en zinsdelen
a.v. ratio a₁ addendum addendum circle angle of obliquity angular velocity annular arranged axes b₁ base circle belt c₁ centre line centroid chain circular cones connected connecting-rod crank cycloidal d₁ describing circle diameter direction disc distance draw drive ellipses epicycloid epitrochoid equal equation face fixed friction gears give given groove hyperbolas hypocycloid intersection involute involute gears left-handed length lever line of centres line of motion line of obliquity link bc linkage logarithmic spiral mechanism move number of teeth o₁ pair pantograph parallel pass path of contact pawl perpendicular piece pinion pitch circle pitch line pitch point plane position PROB pulley rack radii radius ratchet-wheel revolutions per minute right-handed roller rolling contact rotation screw shaft shown in Fig sliding slot spur gears straight line stroke surface tangent thread tooth curves tooth outline train velocity ratio wheel worm
Populaire passages
Pagina 1 - A machine is a combination of resistant bodies so arranged that by their means the mechanical forces of nature can be compelled to do work accompanied by certain determinate motions.
Pagina 149 - As the cylinder turns in the direction of the arrow (Fig. 12-67), the wheel also being urged in the direction of its arrow, the inclined surface of the tooth be comes under the edge s of the cylinder, and thus urges the balance onward; this gives one impulse, as shown in Fig.
Pagina 52 - Wire ropes will not support without injury the lateral crushing due to the V-shaped grooves; hence it is necessary to construct the pulleys with grooves so wide that the rope rests on the rounded bottom of the groove, as shown in Fig.
Pagina 172 - Trains may be denned as trains of wheels in which some or all of the wheels have a motion compounded of a rotation about an axis and a revolution, or translation, of that axis. . The wheels are usually connected by a rigid link, such as D (Fig. 246). This link is usually called the train arm, and it often rotates upon the axis of the first wheel A of the train: the last wheel of the train may or may not be placed upon this axis. In what follows we will consider a wheel to have made one turn or rotation...
Pagina 188 - The clearance is the amount by which the tops of the teeth of one wheel clear the bottoms of the spaces of the other, as they pass the line of centers. The working depth circle is a circle of radius equal to that of the dedendum circle plus the clearance.
Pagina 12 - C was allowed to fall on a small plane mirror mon which was capable of rapid rotation about an axis through o perpendicular to the plane of the paper.
Pagina 22 - Such a pair is called a higher pair, and the contact between the elements is along lines only. 1-13. Incomplete Pairs of Elements. Hitherto it has been assumed that the reciprocal restraint of two elements forming a pair was complete, ie, that each of the two bodies, by the rigidity of its material and the form given to it, restrained the other. In certain cases it is only necessary to prevent forces having a certain definite direction from affecting the pair, and then it is no longer absolutely...
Pagina 3 - Revolution and Rotation. A point is said to revolve about an axis when it describes a circle of which the center is in, and the plane is perpendicular to, that axis. When all the points of a body thus move, the body is said to revolve about the axis. If this axis passes through the body, as in the case of a wheel, the word rotation is used synonymously with revolution. The word turn is often used synonymously...
Pagina 186 - The circular pitch is the distance measured along the pitch circle from a point on one tooth to the corresponding point on the next tooth, or the circumference of the pitch circle divided by the number of teeth.
Pagina 218 - ... simply to be cast, it is certain that they are in many cases too large, if the teeth are to be cut with the slightest pretension to accuracy. Nor does there appear to be any reason why the backlash should vary directly with the pitch ; on the contrary, it seems almost self-evident that the coarser the pitch, the smaller will be the proportion borne to it by any unavoidable error. From this point of view, it appears more reasonable to say that the backlash should vary inversely as the pitch ;...