Abstract:
The disclosed gear system provides distinctive forms of gearing for directly transmitting substantially constant velocity between two shafts, while allowing the angle between the shafts to vary (e.g., by even more than 80.degree.) in any plane during operation. Several forms of gear teeth appropriate for the system are specifically detailed and applied in the design of constant-velocity joints.
Abstract:
A differential apparatus includes a differential casing, a pair of side gears and plural pairs of pinion gears. The pinion gears are accommodated in bores formed in the differential casing, respectively. Each pinion gear has an outer diameter smaller than that of a standard gear to be determined corresponding to predetermined gear specifications. With such a forming of the pinion gears, the tip circular thickness of each pinion gear is increased, so that surface pressure at respective tips of the pinion gears is reduced to improve the seizure resistant capability.
Abstract:
In a screw fluid machine including male and female rotors which are engaged with each other, a casing for accommodating both the male and female rotors, fluid working rooms which are formed by the male and female rotors and the casing, and fluid inlet and outlet ports which are provided in the casing so as to intercommunicate with one end portion and the other end portion of the working rooms, the helix angle of the screw gear constituting each of the male and female rotors is set to be continuously varied in a helix advance direction. Further, the screw gear is designed so that the peripheral length of a pitch cylinder in a helix advance direction on a development of a tooth-trace rolling curve on the pitch cylinder of the screw gear can be expressed by a substantially monotonically increasing function.
Abstract:
The amount of radial flexing (w) in a basic section defined perpendicular to the axis of the flexible external gear (3) at a prescribed point on the tooth trace of the flexible external gear (3) is defined to be an amount of negative deviation flexing smaller than the normal amount of flexing (W.sub.0) The rigid internal gear (2) and the flexible external gear (3) are both spur gears and the number of teeth of the flexible external gear (3) is 2n (n being a positive integer) fewer than that of the rigid internal gear (2). The working tooth profile of one of the gears (2, 3) is defined to be a convex curve whose shape is or approximates a convex curve (L2(O,B)) obtained by similarity transformation of a peak portion (L1(O,A) of the rack-approximated moving path (L1) of a tooth of the gear with respect to the other gear in the basic section of the tooth trace perpendicular to the axis, the portion being convex relative to the other gear, at an enlargement ratio (.lambda.) using the apex of the moving path as the origin. The working tooth profile of the other gear is defined to be a concave curve whose shape is a concave curve (L3(O,C)) obtained by similarity transformation of the same portion of the moving path at an enlargement ratio (.lambda.+1) using the apex of the moving path as the origin. The meshing of the two tooth profiles is pass messing enabling continuous contact and the ability to retain a lubricating oil film between the tooth surfaces is enhanced.
Abstract:
A differential apparatus includes a differential casing, a pair of helical side gears and a pair of helical pinion gears. The helical pinion gears are accommodated in bores formed in the differential casing, respectively. The long and short helical pinion gears have respective first gear portions meshing with the side gears, respectively, and second gear portions meshing with each other. Each gear tooth of the long pinion gear is so tapered that tip thickness of the gear tooth is gradually decreased from an axial end of the gear portion toward the other gear portion. Even if the long pinion gear is inclined by meshing reactive forces, it is possible to ensure sufficient tooth bearing areas at respective tooth faces of the pinion gears.
Abstract:
A gear structure including an internal gear and an external gear meshed together and moved relative to each other through a rotary motion, the radius of the root arcs of the teeth of the external gear being M, which is the ratio between the diameter of the crest and the number of teeth, and being the line of arc in tangent with the crest arcs of each two adjacent teeth, the tooth form curve of the internal gear being obtained by connecting all engaging points at the crest arcs and root arcs of the external gear.
Abstract:
A modified elliptical gear defined by a modified elliptical shape having perpendicularly disposed major and minor axes, and bulged portions projecting outwardly beyond the contour of a true ellipse in peripheral regions between the major and minor axes. A computer is preferably used to rotate a simulated hobbing rack having a row of hobbing teeth around the modified elliptical shape. The outline of the hobbing rack is traced at selected positions during the rack rotation to produce a profile of a modified elliptical gear with projecting gear teeth. A topping shape is superimposed upon the gear profile to selectively top the gear teeth. The modified elliptical gear profile is transmitted to a machining device operable to produce a modified elliptical gear.
Abstract:
The topology of parallel axis gears, such as spur and helical gears is modified to produce quieter and more smoothly operating gear sets with more uniform load distribution. A finite element analysis of the gear in its operating mode is made to produce a plot of radial and tangential deflections of the pinion and gear tooth surfaces which will occur when the gears are loaded during operation. The resultant plot is then inverted to produce a plot, or set of coordinates, which will define the path of travel of the gear tooth grinding wheel, which path is a mirror image of the plot of the finite element analysis. The resulting gears, when subjected to operating loads, will thus be deflected tangentially and radially to their optimum operating, or theoretical true involute, positions so as to produce quieter, smoother, and more evenly loaded gear trains.
Abstract:
A family of conjugate gear tooth profiles is taught in which the relative curvature is a maximum near center and decreases toward tip and flank, where sliding is greatest. In one embodiment the radii of curvature of the individual profiles are least at the pitch point and increase toward tip and flank. The permissible tooth heights are limited only by top lands and bottom lands; and any tooth-numbers can be used without resorting to unequal addendums, although unequal addendums can be used if desired.
Abstract:
In a gear drive device of a railway motor car having a larger gear fixed on an axle and a smaller gear fixed on a rotation shaft of a traction motor, tooth trace of the smaller gear or that of the larger gear is twisted in a manner that the teeth of the smaller and larger gears are engaged in parallel with each other when the axle is deflected due to the load of the railway motor car.