Showing papers on "Pressure angle published in 2001"

Involute gear pair structure

Abstract: In an involute tooth profile pair structure, a pinion has a smaller pressure angle at its addendum than at its dedendum, and the pressure angle at the addendum of a gear wheel is equal to the pressure angle at the dedendum of the pinion, with the pressure angle at the dedendum of the gear wheel being equal to the pressure angle at the addendum of the pinion.

Gear Crack Propagation Path Studies: Guidelines for Ultra-Safe Design

Abstract: Design guidelines have been established to prevent catastrophic rim fracture failure modes when considering gear tooth bending fatigue. Analysis was performed using the finite element method with principles of linear elastic fracture mechanics. Crack propagation paths were predicted for a variety of gear tooth and rim configurations. The effects of rim and web thicknesses, initial crack locations, and gear tooth geometry factors such as diametral pitch, number of teeth, pitch radius, and tooth pressure angle were considered. Design maps of tooth/rim fracture modes including effects of gear geometry, applied load, crack size, and material properties were developed. The occurrence of rim fractures significantly increased as the backup ratio (rim thickness divided by tooth height) decreased. The occurrence of rim fractures also increased as the initial crack location was moved down the root of the tooth. Increased rim and web compliance increased the occurrence of rim fractures. For gears with constant pitch radii, coarser-pitch teeth increased the occurrence of tooth fractures over rim fractures. Also, 25 deg pressure angle teeth had an increased occurrence of tooth fractures over rim fractures when compared to 20 deg pressure angle teeth. For gears with constant number of teeth or gears with constant diametral pitch, varying size had little or no effect on crack propagation paths.

Gear, and gear pairs

Abstract: PROBLEM TO BE SOLVED: To provide a gear which can heighten the bending strength of a tooth and improve the loading capacity. SOLUTION: The gear 11 has a tooth 20 of asymmetrical tooth profile with the reference pressure angle α1 of a front surface 21 of the tooth 20 to which the force is applied in the rotation, and the reference pressure angle α2 of a back surface 22 on the opposite side different from each other, and the reference pressure angle α2 of the back surface 22 is larger than the reference pressure angle α1 of the front surface 21.

Measurement of Pinion Type Cutter Using Coordinate Measuring Machine

Abstract: A method for measuring a pillion type cutter using a coordinate measuring machine is proposed. In this method, the cutting edge profile of the cutter is indirectly measured as the intersecting curve between the flank of tool and the cutting face. Left and right side flanks of the cutter are considered to be the tooth surfaces of two different involute helical gears. The coordinates of many points on the tooth surface and the face are measured using a coordinate measuring machine. The tooth surface and the face are estimated from the measured data by the method of least squares. The cutting edge profile is calculated from the estimated tooth surface and the face. The cutting edge is moved helically and it forms the tooth surface of the actual imaginary gear. A pressure angle of this gear can be calculated. Pressure angle error of the pinion type cutter is that of the imaginary gear.

Helical gear type capacity flowmeter

Abstract: PROBLEM TO BE SOLVED: To obtain a flowmeter using a helical gear that sets the minimum pressure angle to a required angle and has a reference rack tooth shape for sufficiently securing a tooth height rate as a rotor. SOLUTION: When, in the reference rack tooth shape curve of a helical gear being used as a rotor, a part near a pitch circle is set to a straight line with a pressure angle (α0, and, in parts near the tooth tip of an addendum and the tooth bottom of a dedendum, h0 and Z are set to the height of a linear tooth shape and the number of teeth, respectively, radius (g) of a basic circle is set to an involute curve being indicated by an expression (in this case, 0<=h0<=(Z/2.sin2α0)) for connecting them. The minimum pressure angle α0 can be arbitrarily set, thus increasing accuracy for facilitating work when the tooth shape is cut for manufacturing. Also, a tooth height rate (h) can be set to a relatively large value, thus obtaining a flowmeter with a large amount of discharge per rotation.

Method and device for forming tooth profile product

Abstract: PROBLEM TO BE SOLVED: To provide a method and a device for forming a tooth profile product, by which the tooth flank of a tooth profile, which is simply constituted and is formed in a prescribed shape in advance, can be precisely formed in a desired shape with a correct pressure angle. SOLUTION: A forming device bas a tooth flank forming part 10 formed according to the shape of a reversely tapered surface TF to be formed, and is equipped with a forming blade tool 1 to be arranged in a tooth space ts and a tapered plate 3 making this forming blade tool 1 move in the peripheral direction. By making the forming blade tool 1 ascend, descend and move relatively with the tapered plate 3, the tooth profile t is moved in the peripheral direction so that it is interposed, the tooth profile t is pressed by the tooth flank forming part 10, is plastically deformed, and the reversely tapered surface TF is formed.

Multi-head spiral grid-plate for tubelike grinder

Abstract: The utility model relates to a multi-head spiral grid-plate for a tube-shaped grinder, which belongs to the component part of the powder grinding machinery equipment. Multi-head spiral open holes are arranged on a separating storehouse grid-plate and a grinder tail grid-plate, and the angle of the open holes is consistent with the pressure angle of a bull gear. The separating storehouse grid-plate and the grinder tail grid-plate are fixed in a cylinder body through coach bolts and fixed rings, and a ladder lining plate, a flat lining plate and a material lifting plate device are arranged in the inner wall of the cylinder body. A big gear ring is engaged with a pinion gear, and the center in the cylinder body is provided with a central hole and a grinding door. With simple structure, convenient operation, low energy consumption and high efficiency, the utility model has the advantages that the ventilation of the material in the grinder is fluent, the material is not deposited, and the phenomenon of powder over grinding is eliminated. The utility model is widely used for the crushing grinding of the materials of construction material, electric power, chemical industry and metallurgy.

On the transmission efficiency of a spring-type operating kinematic mechanism for an SF6 gas-insulated circuit breaker

Abstract: The purpose of this paper is to study the transmission efficiency of a spring-type operating kinematic mechanism for an SF6 gas-insulated circuit breaker. This mechanism has two degrees of freedom, which, when operating in the open, close, or return mode, becomes a single degree of freedom by fixing a link that adjoins the frame to achieve specific requirements. Firstly, the vector-loop method is employed for position analysis of the links of the mechanism. Subsequently, by using coordinate transformation and the geometry of the cam and the follower, the relationships between cam rotation and the position of the linkage follower in the close operation, as well as cam rotation and the position of the motor-switch follower are established. Based on the transmission angle of the linkage and the pressure angle of the cam mechanism, the transmission efficiencies of the mechanism are evaluated and discussed. The mechanism is also computer simulated and the transmission angle is optimized using the augme...

Structure for combining power transmission worm gear of elevator

Abstract: PURPOSE: Structure for combining a power transmission worm gear of an elevator is provided to minimize power loss by increasing the number of sawtooth and enlarging an engagement area and to improve a riding experience by preventing vibration and noise of an elevator car via a high efficiency speed reducer. CONSTITUTION: A pressure angle of a gear pitch(3') of a worm gear wheel(3) is set up within a range of 8-16 degrees. Both sides of the gear pitch are curved surfaces. A pressure angle of a gear pitch(2') of a cylindrical worm(2) is set up within a range of 8-16 degrees. Both sides of the cylindrical worm gear pitch are recessed inward. An engagement ratio of the cylindrical worm and the worm gear wheel is 4.0. Power loss of the cylindrical worm and the worm gear wheel is 1.4kw/7.5kw. The efficiency of a speed reducer is 81.4%.

Experimental Investigation on Gas-Dynamic Performance of Caret Inlet under Condition of Large Attack Angles and Yaw Angles

Abstract: An experimental investigation has been carried out.The influences of attack angle (α=0°～45°) and yaw angle (β=-15°～+15°) on caret inlet gas-dynamic performance were investigated experimentally.The variation of the inlet performance parameters with the attack angles,as well as total pressure contour plots of inlet/exit at typical states,have been presented,and the relationship between flow characteristics of the inlet and its exit total pressure contour plots has also been analyzed.It is shown that,in the condition of low speed incoming flow (Ma≈0 1),the inlet total pressure recovery coefficient decreases slowly with the increase of attack angle (α=0°～45°),and the total pressure distortion is nearly unchanging.As a result,caret inlet is favorable to maneuver flight at large attack angle.With zero attack angle and at same exit Mach number,the yaw angle has a great influence on position of inlet/exit higher and lower total pressure domains,i.e.the whole exit flow field rotates clock-wise as the yaw angle increases (β=-15°～+15°).However,the influence of the yaw angle becomes weaker with the increase of attack angle.

Feed roller drive, for open-end spinning unit, comprises cylindrical worm with tapered flanks to give reduced pressure angle

Abstract: The feed roller on an open-end spinning unit is driven through a worm (18) and pinion (17) drive. The worm flights are trapezoidal in cross-section with straight flanks (31) and are arranged to give a maximum pressure angle ( alpha ) of 10 deg , preferably 3-5 deg . The non-contact flanks (36) are cut back towards their ends (37).

Working method to dual lead worm

Abstract: PROBLEM TO BE SOLVED: To reduce working time to a dual lead worm to reduce manufacturing cost, and reduce irregularity in tooth thickness. SOLUTION: In working a dual lead worm 10 having a first tooth surface 12 having a specified lead and pressure angle, and a second tooth surface 13 having a specified lead and pressure angle different from that, a single tool 20 provided with a first working part 21 for working the first tooth surface 12 and a second working part 22 for working the second tooth surface 13 is fed in a parallel direction to a center axial line O of the dual lead worm 10 and in a perpendicular direction to that, so the first tooth surface 12 and the second tooth surface 13 are worked simultaneously. The tool 20 may be a disc- shaped rotary tool, with the first and the second working parts 21, 22 formed as a pair of conical working surfaces on both sides of an outer circumferential part of the tool 20, or it may be a cutting tool having cutting edges to be the first and the second working parts 21, 22 provided on both sides of a tip part.