Showing papers on "Pressure angle published in 1993"

Automatic tool changer

Abstract: An automatic tool changer in which the load produced when a turret is rotation-driven is reduced, and abrasion in the balls and the like of a speed reducer, and mal-distribution of an axial pressing force are prevented. The speed reducer that drives the turret in the automatic tool changer is constructed by superposing a driving plate, a holder, and a driven plate in the order named. In the driven plate fitted with tools, there is formed a ball groove in a concave-convex shape having the number of cycles corresponding to the number of the tools. In the driving plate, there is provided a ball groove obtained by enlarging the ball groove of the driven plate in the angular direction and copying two cycles. The holder is provided with a plurality of guide holes in the radial direction, which hold their respective balls. The driving plate is rotated by spindle rotation, and the driven plate is driven at a reduced speed of (the number of tools/2) through the balls. It is possible to reduce the load by setting the ball groove of the driven plate at the optimum pressure angle. The balls are dispersed, so that the axial pressure is even, to thereby reduce the abrasion of the balls and ball grooves, and the like.

Design and machining of cylindrical cams with translating conical followers

Abstract: A simple approach to the profile determination and machining of cylindrical cams with translating conical followers is presented. On the basis of the theory of envelopes for a 1-parameter family of surfaces, a cam profile with a translating conical follower can be easily designed once the follower-motion program has been given. In the investigation of geometric characteristics, it enables the contact line and the pressure angle to be analysed using the obtained analytical profile expressions. In the process of machining, the required cutter path is provided for a tapered endmill cutter, whose size may be identical to or smaller than that of the conical follower. A numerical example is given to illustrate the application of the procedure.

Wheel hub rotary joint connection for vehicle - has pair of cone shaped matching contact surfaces on joint component and on bearing ring

Abstract: Wheel hub rotary joint connection for a vehicle in which a counter surface (29a) on the outer section of the joint is cone shaped and engages in a complementarily formed conical face surface (30a) on the adjacent, separate bearing inner ring (23a). The counter surface on the outer section (14) runs vertically to the pressure angle of the bearing inner ring. ADVANTAGE - Counteracts deformation effects as a consequence of bending moments and also reduces the incidence of fretting corrosion.

Stress concentrations at an oblique hole in a thick flat plate under an arbitrary in-plane biaxial loading

Abstract: The results of an extensive ‘frozen-stress’ photoelastic investigation of the stresses at isolated oblique holes in thick wide plates subjected to uniform uniaxial tension are used to provide stress concentration factors at holes resulting from any form of biaxial in-plane loading. The work covers plate thickness/hole diameter ratios from 1.3 to 3.0 and hole obliquity angles up to 60 degrees. Over these ranges the effects of changes in the plate thickness/hole diameter ratio are not of major importance but the effects of changes in the angle of obliquity are considerable.

Synchronous drive belt

Abstract: A synchronous drive belt for use in low speed and high torque applications has a zero pressure angle over a relatively greater portion of the fore and aft flank surfaces of the belt teeth. A pulley is also described which is particularly suitable for use in combination with the belt.

Fast joint buckle

Abstract: The utility model discloses a fast joint buckle used for overlapping the scaffold. The utility model comprises a fast connecting fastening, an angle fast connecting fastening, and an orthogonal fast connecting fastening. The both ends of the bore of the fastener are processed with a blade-shaped braking semi-circular ring, and hinged with a cam through a rivet, and are two screw surfaces with the end face of a small convex area of the cam axle and two bearing holes of the cam axle contacted with the moving axis. The intersecting line combined by a plane passed through the central line of the cam hole and a curved surface of the cam, is a section of circular arc. The pressure angle on the any point of the intersecting line of the radial section of the cam and the curved surface of the cam, is smaller than the self-locking angle. The utility model is adopted to solve the prior art problem which is the corrosion screw is inconvenient to fold after the outdoor service. Because the fastener is a hollow element, it can alleviate the weight and raise the work efficiency and cling property of the fast joint buckle.

Roller cam gear device and working device for cam gear thereof

Abstract: PURPOSE: To obtain an elaborate roller cam gear assembly free from backlash. CONSTITUTION: A cam gear is formed by a new tooth form curve to minimize friction by converting the slide contact of gear into the complete rolling contact by the roller 10 and the cam gear 13, and to prevent a large force caused by a low pressure angle. When a roller pinion 11 having free-rotatable rollers 10 uniformly spaced on the periphery rotates and the rollers approach the cam gear, two or more rolling contact points are maintained. As the contact tooth form curves for the approach phase and the recess phase are symmetric with respect to the radius line, a constant turning angle velocity ratio can be maintained even in the case of rotation reversal. Thus, smooth and elaborate power transmission can be achieved free from backlash.

Hot Finish Rolling of Injection-Molded Plastic Helical Gears (Properties of Finished Tooth Form)

Abstract: Hot finish rolling has been developed as a simple finishing method for injection-molded plastic gears. In the present paper, properties of the hot-finish-rolled tooth form are discussed so as to obtain general information for improving the quality of the injection-molded plastic helical gears. The plastic helical gear generally has a positive pressure angle error on the tooth profile and a helix angle error on the tooth trace. After the hot finish rolling process, the finished gear has a negative pressure angle error on the driven tooth flank and a positive pressure angle error on the followed tooth flank. Sliding of tooth flanks along the profile contributes to inducing these errors. Hence, hot finish rolling including the process of reversing the rotation of gears is very useful for improving the quality of the tooth profiles of plastic gears. However, the hot finish rolling process exhibits no sliding along the face width, and thus it cannot improve the quality of a tooth trace which has a helix angle error. It can be expected that sliding along the face width will be useful for improving this error. For example, the axial feed of the work gear might induce such sliding.

Establishing inclination or reclination rotation angle of human head

Abstract: The method involves computing the rotation angle (beta) of the head from a corresp. mathematical relationship, or measuring the angle directly, with an inclination or reclination, with a sufficiently large inclination or reclination angle (alpha) greater than 10-15 deg. The inclination angle (alpha) and the angle with the vertical plane (gamma) are measured using at least one vertical pendulum (14), fixed to the head.The inclination or reclination angle produced from the max. inclined position is measured and is stored as a base value. The angle (gamma) with the inclined position, resulting from the rotation of the head (10) about the inclination axis, are used for the direct determination of the rotation angle (beta).