Showing papers on "Pressure angle published in 1977"

Standard-pitch gearing

Abstract: Involute gearing can be optimized with respect to torque capacity only if the number of pinion teeth is standardized in a fairly narrow range, between about 15 and 40 teeth, depending on the tooth materials, pressure angle and gear ratio. The present invention discloses an alternative system of gearing that standardizes pitch instead of tooth numbers, so that pinions with several hundred teeth can be designed without sacrifice of any torque capacity relative to that of coarse-tooth involute gearing. The use of finer teeth reduces friction, heating and wear, but in particular helps to minimize operating noise.

Crowned involute splines and method of making

Abstract: An improved drive shaft is disclosed of the type used in a rotary fluid pressure device including an input-output shaft and a gerotor gear set having an externally toothed member which orbits and rotates within an internally toothed member. Both the input-output shaft and the externally toothed member define straight internal splines, and the drive shaft includes a set of crowned, involute external splines at each end thereof, in engagement with the respective straight internal splines. The crowned external splines are hobbed with a hob on which the cutter teeth have a pressure angle φ H greater than the primary pressure angle φ S of the crowned splines. The increased pressure angle φ H of the cutter teeth makes it possible to reduce the crown angle on the splines, while still maintaining the necessary clearance X between each external spline and the adjacent internal spline at any given axial distance Y along the external spline from the central plane. Reducing the crown angle makes it possible either to increase the length of the external splines for a given shank diameter, or to increase the shank diameter for a given spline length. In either case, the result is an increase in the torque carrying capacity of the shaft by a factor F, wherein F equals the ratio of sin φ H /sin φ S .

The effect of rotation on a gas-operated free-piston pressure gauge

Abstract: It is shown that when a gas-operated free-piston pressure gauge is used for measuring pressure relative to atmospheric pressure, the usual relative rotation of the piston and cylinder with added masses can produce a pressure effect up to ten times greater than the accuracy of measurements relative to vacuum. The magnitude of this pressure effect depends on the rotational frequency and on whether a bell-jar is in place or not.

Distortions and Residual Stresses of Gears Caused by Hardening : 2nd Report, Through-Hardening of Gear Made of S45C Carbon Steel

Abstract: In this paper, the authors investigated experimentally and theoretically the distortions and the residual stresses of gear tooth of standard spur gears made of S35C carbon steel generated by induction-hardening. The main results obtained from this investigation are summarized as follows. (1) Analytical method introduced by the authors is available for the estimation of distortions in the case of induction-hardening of gears. Comparing analytical distortions, such as outside diameter, whole depth and tooth profile, with experimental ones, there are no remarkable difference except pressure angle. (2) Residual stresses from theoretical analysis agree in the tendency with the experimental ones. Consequently, possibility of theoretical analysis of residual stresses of gears in the induction-hardening process could be expected.

W-N gear having a maximum surface strength

Abstract: A W-N gear which has a surface strength at least nearly maximized for a given addendum and minimum pressure angle is realized by selecting a mean radius for the convex and concave circular arcs of the tooth profile in an appropriate range. Also, a dual=line mesh W-N gear of the character described which has a requisite face width minimized is obtained by selecting a mean arc radius which lies in the range referred to above and enables the addendum and dedendum points of meshing contact to appear at equal angle intervals.

Method of manufacturing tools used in producing gears by rolling

Abstract: PURPOSE:To provide a method of manufacturing tools used in producing greas by rolling, in which tooth form is corrected by detecting pressure angle to becorrected from the results of measurement of product gears, whereby toothform correction of gear rolling tools can be achieved by one or two correction of hob.

Tooth form of gear wheel

Abstract: PURPOSE:Increasing the length of a gear wheel and raising the strength of its face by continuously varying its pressure angle or twisting angle in a plan screw state along its width direction.

Negative pressure control valve device

Abstract: PURPOSE:A hole opened to the surrounding air which is provided at intermediate portion of a negative pressure passage between a carbreator and a negative pressure angle advancement device of distributor is mechanically opened and closed in response to a displacement of operation system which is operatively connected to a speed change lever in order to prevent a decrease in output due to delay in advancement angle and an increase in fuel consumption when the engine is operated at maximum speed

Rolling drive on a gear grinding machine

Abstract: The invention relates to an adjusting device for an oscillating workpiece. In one type of gear grinding machine, there is provided means for effecting oscillation of the workpiece simultaneously and in synchronism with reciprocation thereof in order to enable an involute curve to be ground onto the workpiece by a grinding wheel which is fixed except for its rotation. In such machine, this oscillation is created by one or more cams fixed to the workpiece spindle, together with at least two bands fixed at one of their respective ends to such cam and at the other of their respective ends to a fixed portion of the machine with the bands being wrapped at least partially around such cam. Thus, sidewise reciprocating movement of the workpiece spindle effects oscillation of same in a known manner according to the curve provided on said cams. According to the invention, control over the details of the workpiece, particularly the pitch circle and pressure angle, may be obtained by shifting transversely the axis of the cam or cams relative to the axis of the workpiece spindle. Thus, the cams are mounted with respect to said spindle, as onto a sleeve supporting said spindle, through threaded means for effecting relative adjustment therebetween in one or more directions.