Topic
Pressure angle
About: Pressure angle is a research topic. Over the lifetime, 1373 publications have been published within this topic receiving 10245 citations. The topic is also known as: angle of obliquity.
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Patent•
17 Apr 2020TL;DR: In this article, it was shown that the tip of a worm wheel can be given a more tapered shape than if the pressure angles of the teeth of the worm and the pressure angle of the worms were the same angle (as has been the case in the past).
Abstract: Because the pressure angle [beta]degree(=12degree) of teeth 47 of a worm wheel 46 is greater than the pressure angle [alpha]degree(=11degree) of teeth 45 of a worm 44, the tips of the teeth 47 of theworm wheel 46 can be given a more tapered shape than if the pressure angle of the teeth of the worm and the pressure angle of the teeth of the worm wheel were the same angle (as has been the case in the past). This makes it possible to ensure that teeth which, in past cases, had been variable in terms of coming into contact reliably do not come into contact with each other even if there had been non-uniformity in the teeth 47 of the worm wheel 46.
Patent•
07 Jul 1984
TL;DR: In this article, a pitch circle of follower roller groups is arranged to be different in radius and a deformed uniform motion cam curve is obtained by dividing a distributed angle 360/2N of said rotary angles into distributive angles A1, A2 so that a pressure angle rho1 formed by the first parallel cam 91 and the first follower rollers 23a at stopping of a device is almost equal to a pressure angles rho2 formed by a second parallel cam 92 and the second follower roller rollers 24a at starting of the device, the first and the
Abstract: PURPOSE:To obtain an intermittent driving gear easily prepared with simple assembly and adjustment, by arranging a pitch circle of follower roller groups to be different in radius and forming working surfaces of both inscribed parallel index cams in a shape not doubled CONSTITUTION:Follower roller groups 23, 24 in a quantity equal to a respective indexing number N alternately arrange their rotary centers respectively on pitch circles 25 and 26 concentrically set in a different radius Obtaining a deformed uniform motion cam curve by dividing a distributed angle 360/2N of said rotary angles into distributive angles A1, A2 so that a pressure angle rho1 formed by the first parallel cam 91 and the first follower rollers 23a at stopping of a device is almost equal to a pressure angle rho2 formed by the second parallel cam 92 and the second follower rollers 24a at stopping of the device, the first and the second parallel cams 91 and 92 having the deformed uniform motion can curve are formed in a shape such that their working cam surfaces are substantially not doubled While if the fixed position of an eccentric cover 15 for a casing 1 is changed, the rotary center of a turning disc 10, that is, an output shaft 3 is placed aside, and an eccentric distance (e) of the output shaft 3 from an input shaft 2 can be finely adjusted
13 Oct 2017
TL;DR: In this paper, the influence of gear pressures on the contact stress of asymmetric increasing-speed spur gear drive system meshing in front of the pitch point was analyzed and it was shown that the contact stresses can be effectively reduced by tuning the pressure on the driving side.
Abstract: Advantages of asymmetric gear include larger load carrying capacity, smaller vibration and longer life. Vibration of the gear system due to the change of the direction of the friction force can be avoided when gears drive meshing beyond the pitch point. In this paper, the basic theory of the asymmetric gear with double pressure angles driving system meshing beyond the pitch point is developed. And the influence of gear pressures on the contact stress of driving gear of asymmetric increasing-speed spur gear drive system meshing in front of the pitch point is analyzed. Results show that the contact stress of asymmetric increasing-speed gear meshing in front of the pitch point can be effectively reduced by tuning the pressures on the driving side.
Patent•
24 Dec 2014
TL;DR: In this article, a gear-rack synchronizing mechanism is characterized in that a gap is formed between reference circle and reference line of the gears and the racks, and gap amount is delta.
Abstract: The invention relates to the field of mechanical structures, in particular to a gear-rack synchronizing mechanism which comprises two pairs of gears and racks and a synchronizing shaft in hard connection with the gears. The gears and the racks are positioned on two sides of equipment and meshed. The gear-rack synchronizing mechanism is characterized in that a gap is formed between reference circle and reference line of the gears and the racks, and gap amount is delta; non-synchronous adjusting quantity delta L is set for each of the gears and the racks, and the delta L=2delta x tan alpha, wherein alpha refers to gear pressure angle, and delta L is smaller than or equal to maximum movable deviation of the gears and the racks on the two sides and larger than or equal to gear-rack follow-up deviation. By adopting the above design, the non-synchronous adjusting quantity is set for each of the gears and the racks, so that connected by the synchronizing shaft, the gears and the racks can realize synchronous acting, jamming of a guide device is avoided, and servo precise control is unaffected.
28 Jan 2023-Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science
TL;DR: In this article , an experimental stress analysis is conducted on various configurations of the tooth profile and tooth fillet shape for the proposed FFG and the standard involute gear to validate the analytical results.
Abstract: Free-Form-Gear (FFG) is a recently published title for a gear that has a curved path of contact and offers contact between a convex addendum and a concave dedendum during the meshing cycle. Based on this method of designing a gear pair, the path of contact can be altered to improve the way the gears mesh and slide against each other by only adjusting the maximum pressure angle and the involute curve parameter. The analytical investigations into this gear pair indicated that, when compared to the standard involute gear pair, the sliding velocity, meshing efficiency, contact, and fillet strengths are improved while the contact ratio is decreased. In this study, experimental stress analysis is conducted on various configurations of the tooth profile and tooth fillet shape for the proposed FFG and the standard involute gear to validate the analytical results. Since it is difficult to measure the contact stress for the gear specimens, the contact stresses at critical points are estimated using an effective computational technique based on photoelastic data and a numerical approach utilizing the nonlinear least squares method. At the fillet zone, isochromatic fringe patterns are used to directly measure the maximum fillet stress. Using addendum modification coefficients, the reduction in contact ratio for the proposed FFG is eliminated, and the results are then verified experimentally. Based on the experimental estimations, the finite element analyses are conducted using ABAQUS to simulate the examined gear specimens. Under the same loading conditions, the experimental, analytical, and numerical results have all been in good agreement.