SU617648A1

SU617648A1 - Device for securing and locking cam

Info

Publication number: SU617648A1
Application number: SU762361055A
Authority: SU
Inventors: Василий Семенович Жарков; Станислав Леонидович Чекалов; Нина Константиновна Кармий
Original assignee: Предприятие П/Я А-3681
Priority date: 1976-05-10
Filing date: 1976-05-10
Publication date: 1978-07-30

Description

Изобретение относитс к машиностроению и может быть использовано в устройствах дл креплени и фиксации кулачков, например, конечных выключателей, обеспечивающих точную регулировку положени какой-либо детали относительно вала и ее фиксацию в любом положении в пределах угла 360°.The invention relates to mechanical engineering and can be used in devices for fastening and fixing cams, for example, limit switches, which provide precise adjustment of the position of any part relative to the shaft and its fixation in any position within a 360 ° angle.

Известна кулачкова шайба, установленна на валу в требуемом положении с помощью втулки и болтов с возможностью их независимого перемещени .1.Known cam washer mounted on the shaft in the desired position using a sleeve and bolts with the possibility of independent movement .1.

Недостатками этого устройства вл ютс ограниченный диапазон регулировани , не обеспечивающий регулировку положени профильных поверхностей кулачков в пределах полного угла 360°, а также недостаточна чувствительность к регулировке, так как с отклонением кулачка от нейтрали измен етс величина угла его перемещени относительно вала за один оборот регулировани болта.The disadvantages of this device are the limited range of adjustment, which does not ensure the adjustment of the cam profile surfaces within a full 360 ° angle, as well as the lack of sensitivity to adjustment, since the angle of its movement relative to the shaft changes during one adjustment of the bolt with the cam deviation from the neutral .

Известно также устройство дл креплени и фиксации кулачка, установленного на валу с возможностью регулировки его положени винтами 2.It is also known a device for fastening and fixing a cam mounted on a shaft with the possibility of adjusting its position with screws 2.

Это устройство по своей технической сущности и достигаемому эффекту наиболее близко к изобретению. В нем кулачок имеет возможность регулировани и фиксации This device in its technical essence and the achieved effect is closest to the invention. In it, the cam has the ability to adjust and fix

относительно вала в пределах полного угла 360°.relative to the shaft within a full angle of 360 °.

Недостатки известного устройства состо т в недостаточной надежности фиксации кулачка силами трени , особенно при вибрационных нагрузках, а также в сложности обеспечени точной регулировки положени кулачка в св зи с перемещением подвижного диска вручную без применени какоголибо привода, например винтовой пары.The drawbacks of the known device are the insufficient reliability of cam fixation by friction forces, especially under vibration loads, as well as the difficulty of accurately adjusting the cam position due to manual movement of the movable disk without using any drive, such as a screw pair.

Цель изобретени - повышение точности фиксации, чувствительности регулировки и надежности креплени кулачка, в том числе при вибрационных нагрузках.The purpose of the invention is to improve the fixing accuracy, the sensitivity of the adjustment and the reliability of the cam attachment, including during vibration loads.

Это достигаетс тем, что кулачок выполнен с несколькими парами смещенных по его оси резьбовых отверстий, снабженных парой винтов,а вал - с несколькими группами опорных поверхностей, смещенных одна относительно другой в осевом и тангенциальном направлени х и обеспечивающих непрерывное угловое перемещение, а также жесткую фиксацию кулачка в требуемом положении при взаимодействии с упом нутыми винтами.This is achieved by the fact that the cam is made with several pairs of threaded holes that are displaced along its axis, equipped with a pair of screws, and a shaft with several groups of supporting surfaces that are displaced one with another in the axial and tangential directions and provide continuous angular movement cam in the desired position when interacting with the screws.

Claims

FIG. 1 shows schematically the device, a general view; in fig. 2 is a section A-A in FIG. 1 (section along the axis of a pair of screws); in fig. 3 - profile of the supporting surface of the shaft. The device consists of shaft 1, Cam 2 and adjusting screws 3. On shaft 1 there are groups of supporting surfaces 4, displaced one with another in axial and tangential directions. By giving the shaft supporting surfaces a shape having a profile of an equidistant surface curve, which is given by parametric equations:.-FarcsinA: J B-sin | y Rs-cos 4-3rcsin 2 "2R J we can provide a constant angle of cam rotation relative to the shaft during one turn of the adjusting screw, which allows to provide a constant sensitivity to adjustment throughout the whole range of adjustment. The cam has several pairs of threaded holes that are offset from each other along its axis, into one of which two adjusting screws are screwed, which, with their spherical ends, rest on one of the shaft supporting surfaces. The distance in from the shaft axis to the center of the sphere of the adjusting screw is determined by the formula: + n. NlS, where K is the distance between the axes of the adjusting screws; Ds - diameter of the centering neck ... n - the number of revolutions of the adjusting screw; n is the number of revolutions of the adjusting screw necessary for turning the cam to the full angle of adjustment with the screws resting on only one of the bearing surfaces; 5 - thread pitch adjustment screws; F is the angle of cam turn relative to the shaft with the screws resting only on one of the bearing surfaces. In this case, the condition m-p-F ZbO should be met, where m is the number of groups of supporting surfaces equal to the number of pairs of threaded holes in the cam; P - the number of supporting surfaces in the group. The device works as follows. The screws 3 are screwed into one of the pair of threaded holes of the cam 2 and, with their spherical ends, rest on one of the bearing surfaces 4 of the shaft 1. One screw 3 is unscrewed and the other is screwed in, moving the cam 2 relative to the shaft 1. If the required position of the cam 2 relative to the shaft 1 is not achieved, resting on one bearing surface 4, the screws 3 are unscrewed and relocated to another pair of threaded holes of the cam 2, while they will rest on the other bearing surface 4, which is offset in axial and tangential pressure. ION's. The screws 3 are used in addition to adjusting and for fixing the cam 2 to the shaft 1. The described device for fixing and fixing the cam is quite simple, technologically and provides precise adjustment of any female part relative to the shaft and its secure fixation in any desired position within an angle of 360 °. The invention is a device for fastening and fixing a cam mounted on a shaft with the possibility of adjusting its position with screws, characterized in that, in order to improve fixing accuracy, adjustment sensitivity and fastening reliability, including under vibration loads, the cam is made with several pairs of biased its axes are threaded holes in which screws are installed, and the shaft with several groups of supporting surfaces offset from one another in the axial and tangential directions. Sources of information taken into account during the examination 1. USSR author's certificate No. 214944, cl. F 16H 53/04, 1968.

2. USSR author's certificate number 298779, cl. F 16H 53/04, 1971.

Riga LL