Showing papers on "Pressure angle published in 1990"

The optimum design of KHV planetary gears with small tooth differences

Abstract: This paper deals with the design of KHV planetary gears, looking particularly at applications which give high reduction ratios. Under these conditions the differences in tooth numbers between the annulus and planet gears are small and problems of interference become critical. In addition, the working pressure angle can be as much as three times the generated pressure angle, resulting in large bearing forces and low transmission efficiencies. A method of minimizing the working pressure angle while achieving interference-free gears for cases where the tooth differences may be as small as unity is described.

Engine starter apparatus

Abstract: An engine starter apparatus being arranged such that a rotational force from an electric motor (2) is transmitted to an output rotary shaft through a planetary speed reduction gear(7). The number Zs of teeth of a sun gear(4), the number Zp of teeth of a planet gear (7), the number Zi of teeth of an internal gear (6) and the number N of the planet gears satisfy the equation (Zs + Zi)/N an integer, and the pressure angle α bi of the engagement between the planet gear and the internal gear is arranged to be cos⁻¹{(Zi - Zp)/(Zs + Zp) × cosαbs}, where αbs is the pressure angle of the engagement between the sun gear and the planet gear.

Apparatus for measuring gear

Abstract: A gear measuring apparatus comprises detecting device for outputting detection signals, an X-direction linear travel system for making the detecting device travel linearly in an X direction perpendicular to a radial line and rotation device for rotating the detecting device by causing the X-direction linear travel system to rotate around the rotation center of the gear. The gear measuring apparatus further comprises control device for interlocking the rotation and the X-direction linear travel of the detecting device so that a probe draws the standard involute tooth form, because the detecting device, which are set to an initial position, are rotated at only an extremely small angle θ by the rotation device, and at the same time the detecting device are made to travel linearly by θ·(Dp·cosα)·1/2 with the aid of the X direction liner travel system in the X direction, and recording device for recording the measured results based on detection signals from the detecting device. In addition, Dp is a pitch diameter and α is a pressure angle of the gear to be measured.

All wheel-slip limiter for automobile

Abstract: PURPOSE: To prevent a self-locking by setting the normal module of all gears as small as possible in proportion to the drive moment to be transmitted, and setting the operating pressure angle as large as possible. CONSTITUTION: In order to minimize the mechanical friction loss of a planetary gear and avoiding the self-locking of a planetary gear type slip limiting device in the start of an automobile under a load, the teeth of sun gears 7, 9 and a planetary gear 14 are formed in special mode. The normal module (m) of all gears is selected as small as possible to be proportional to the drive moment to be transmitted from the reason of strength, and the operating pressure angle αis set to be as large as possible.

Engaging device for turning gear

Abstract: PURPOSE: To reduce static friction based on a weight of a rotor by setting an upward reactive force of a bull gear and a downward reactive force of a frame to be substantially vertical. CONSTITUTION: When a carriage 57 is in an engagement position, a line passing through a rotation axis of a first pinion 63 and a rotation axis of a bull gear 23 form an angle P' downward from horizon. This angle is selected to be substantially equal to a designed pressure angle P of teeth of the gear. Further, a gravity center 67 of the carriage 57 is above a rotation axis 59 of a second pinion 65, and the carriage 57 is designed to slightly come to a side of a vertical line. At this time, a substantially vertical upward vector V is generated from a force acting upon the designed pressure angle P to the teeth of the gear 23. Since the pressure angle P is substantially the same as the angle P', the vector V does not have a horizontal component. Therefore, an upward force to a rotor becomes maximum, and a torque needed for disengaging the rotor and a reactive force of a turning device become minimum.

Rack construction for monorail carrying vehicle

Abstract: PURPOSE:To increase the anti-wear property of a rack and the rigidity of a monorail by firmly fixing a rack, provided with a specified pressure angle, a specified distance in module from pitch circle to addendum, and a specified distance in module from pitch circle to dedendum, on the side surface of a rail main body with rectangular cross-section. CONSTITUTION:A single-rail carrying vehicle used in orange park, etc. is so constructed that the motive power unit and the carriage of the vehicle can travel on a monorail by themselves. In this case, a rack 23 with a specified composition is stamped firmly on the side surface of a rail main body 20 with rectangular cross-section. Namely, the rack 23 is formed by cutting a steel material containing a carbon of 0.1 to 1.7% in gears, and the pressure angle, the distance from the pitch circle to the addendum, and the distance from the pitch circle to the dedendum are set at 25 deg., 0.7 to 0.9 module, 0.875 to 1.125 module, respectively. Thus, anti-wear property of the rack 23 can be increased, cutting time and cost can be reduced, and the rigidity of the rail main body 20 can be increased.

Method for cutting involute gears

Abstract: A method for simultaneously cutting and chamfering involute gears. The pressure angle α1 and module M of the teeth of a hob for cutting the teeth are selected with respect to the nominal pressure angle α0 and nominal module m of the gear to be cut according to the following equation: m cos α0 =M cos α1. According to the present invention, a single hob cutter is sufficient to cut gears having a wide range of numbers of teeth.