SU870795A1

SU870795A1 - Overrunning mechanism

Info

Publication number: SU870795A1
Application number: SU782579017A
Authority: SU
Inventors: Серго Николаевич Ломовцев; Леонид Павлович Новиков
Original assignee: Предприятие П/Я М-5641
Priority date: 1978-02-13
Filing date: 1978-02-13
Publication date: 1981-10-07

Description

Изобретение относится к области машиностроения и может быть использовано в высокоскоростных механизмах свободного хода, преимущественно в редукторах несущего винта вертолета. ⁵Известен механизм свободного хода, содержащий ведомый вал в виде обоймы, ведущий вал с площадками, цилиндрические ролики, расположенные между площадками ведущего вала и внутрен- ^wней поверхностью обоймы, и прижимное устройство в виде системы радиальных каналов для подвода масла к площадкам ведущего вала [1}.The invention relates to mechanical engineering and can be used in high-speed freewheeling mechanisms, mainly in the rotor gearboxes of a helicopter. Known ⁵ freewheel comprising a driven shaft in a cage, the drive shaft with facilities, cylindrical rollers disposed between the drive shaft and pads ^w internal surface of the cage therein, and biasing means in the form of radial channels of the system for supplying oil to the sites of the drive shaft [ 1}.

Однако такой механизм не дбеспечи- 15 вает безударного включения при использовании его в конструкции редуктора несущего винта вертолета, так как привод маслонасоса, подающего масло к площадкам ведущего вала, осуществ- 20 лен от кинематической-цепи, соединзнной с ведомым валом, который в начальный момент работы механизма свободного хода неподвижен. _However, such a mechanism does not provide a shock-free start when it is used in the design of the rotor gear of a helicopter, since the drive of the oil pump supplying oil to the drive shaft platforms is 20 from the kinematic chain connected to the driven shaft, which at the initial moment the freewheel mechanism is stationary. _

Известен механизм свободного хода редуктора несущего винта вертолета, содержащий ведущий вал, снабженный площадками, ведомый вал, выполненный в виде.обойьы, цилиндрические ролики, расположенные между площадками веду- 30 щего вала и внутренней поверхностью обоймы, и прижимное устройство, выполненное в виде сепаратора, взаимодействующего с пружиной кручения, один конец которой прикреплен к ведущему валу f2]. Однако в таком механизме имеет место увеличенный износ контактирующих элементов за счет воздействия неуравновешенных центробежных сил пружины при повышенной передаваемой мощности и скорости, что уменьшает его ресурс..The known free-wheeling mechanism of the rotor rotor of a helicopter, comprising a drive shaft provided with platforms, a driven shaft made in the form of an oboe, cylindrical rollers located between the sites of the driving shaft and the inner surface of the cage, and a clamping device made in the form of a separator, interacting with a torsion spring, one end of which is attached to the drive shaft f2]. However, in such a mechanism there is an increased wear of the contacting elements due to the influence of unbalanced centrifugal forces of the spring with increased transmitted power and speed, which reduces its life ..

Целью изобретения является увеличение ресурса путем уменьшения износа поверхностей контактирующих элементов.The aim of the invention is to increase the resource by reducing the wear of the surfaces of the contacting elements.

Поставленная цель достигается за счет того, что прижимное устройство снабжено поводком, выполненным в виде втулки, имеющей наружное круговое ребро с радиальными выступами, размещенными в радиальных пазах сепаратора, при этом поводок установлен на подшипнике на ведущем в<£пу, а другой конец пружины кручения закреплен на поводке.This goal is achieved due to the fact that the clamping device is equipped with a lead made in the form of a sleeve having an outer circular rib with radial protrusions placed in the radial grooves of the separator, the lead being mounted on a bearing on the drive at <£ pu, and the other end of the torsion spring fixed on a leash.

На фиг. 1 изображен продольный разрез механизма свободного хода;на фиг. 2 - сечение А-А на фиг. 1; на фиг. 3 - вид по стрелке Б на фиг. 1.In FIG. 1 shows a longitudinal section of the freewheel; FIG. 2 is a section AA in FIG. 1; in FIG. 3 is a view along arrow B in FIG. 1.

Механизм свободного хода имеет ведущий вал 1, снабженный площадками с отверстиями 3 и опирающийся через подшипник качения 4 на ведомый вал 5, выполненный в виде обоймы, между которым и площадками 2 ведущего вала 1 установлены цилиндрические ролики 6, и прижимное устройство, которое' состоит из сепаратора 7, поводка 8 в виде втулки 9, имеющей наружное круговое ребро 10 с радиальными выступами 11, входящими в радиальные пазы 12 сепаратора 7, и пружины 13, концы которой закреплены на ведущем валу 1 и поводке 8. Поводок 8 установлен на ведущем валу 1 на подшипнике 14. Ведущий вал 1 имеет систему радиальных каналов 15 для подвода масла к площадкам 2 ведущего вала 1. Отверстия каналов 15 на площадках смещены от линий контакта роликов 6 с площадкой так, чтобы между роликом 6 и площадкой 2 был образован масляный клин.The free-wheeling mechanism has a drive shaft 1, equipped with pads with holes 3 and supported through a rolling bearing 4 on a driven shaft 5, made in the form of a cage, between which and the pads 2 of the drive shaft 1 are mounted cylindrical rollers 6, and the clamping device, which consists of separator 7, a lead 8 in the form of a sleeve 9, having an outer circular rib 10 with radial protrusions 11 included in the radial grooves 12 of the separator 7, and a spring 13, the ends of which are fixed on the drive shaft 1 and lead 8. The lead 8 is mounted on the drive shaft 1 on bearing Nike 14. The drive shaft 1 has a system of radial channels 15 for supplying oil to the pads 2 of the drive shaft 1. The openings of the channels 15 on the pads are offset from the contact lines of the rollers 6 with the platform so that an oil wedge is formed between the roller 6 and the platform 2.

Механизм работает следующим образом.The mechanism works as follows.

При вращении ведущего вала 1 отно- ’ сительно ведомого вала 5 по стрелке В происходит соединение валов 1 и 5 из-за заклинивания роликов при повороте сепаратора под действием крутящего момента пружин 13, а при обгонке ведомым валом 5 ведущего вала 1 их разъединение и расклинивание роликов 6« Одновременно с увеличением шага оборотов ведущего вала усилие вытекающей из отверстий 3 под действием давления насоса и центробежных сил смазки стабилизирует ролики.When the drive shaft 1 rotates relative to the driven shaft 5 in the direction of arrow B, the shafts 1 and 5 are connected due to jamming of the rollers when the separator is turned under the action of the springs 13, and when the driven shaft 5 drives the drive shaft 1 overtaking, the rollers separate and wedge 6 “Simultaneously with the increase in the pitch of the revolutions of the drive shaft, the force emanating from the holes 3 under the influence of the pressure of the pump and centrifugal forces of the lubricant stabilizes the rollers.

Центробежная сила, возникающая при вращении ведущего вала и воздействующая на пружину 13, воспринимается поводком 8, равномерно распределяю щим усилия по роликам б через сеператор 7.The centrifugal force arising from the rotation of the drive shaft and acting on the spring 13 is perceived by the leash 8, which evenly distributes the forces on the rollers 6 through the separator 7.

Эффект от реализации изобретения заключается в уменьшении износа контактирующих элементов муфты свободно го хода и увеличения ее ресурса.The effect of the invention is to reduce the wear of the contacting elements of the freewheel and increase its life.

Claims

The invention relates to the field of mechanical engineering and can be used in high-speed free-wheeling mechanisms, mainly in the helicopter rotor gearboxes. A known free wheeling mechanism comprising a driven shaft in the form of a cage, a driving shaft with pads, cylindrical rollers located between the leading shaft sites and the inner surface of the cage, and a clamping device in the form of a system of radial channels for supplying oil to the leading shaft sites 1}. However, such a mechanism does not ensure shock-free activation when it is used in the design of the helicopter rotor gearbox, as the oil pump driving the oil to the drive shaft sites is from a kinematic chain connected to the driven shaft. the motion is motionless. A known mechanism for the free movement of the helicopter’s main rotor gearbox contains a drive shaft provided with pads, a driven shaft made in the shape of a boom, cylindrical rollers located between the drive shaft pads and the inner surface of the yoke, and a pressure device made in the form of a separator interacting with a spring torsion, one end of which is attached to the drive shaft G23. However, in such a mechanism, increased wear of the contacting elements occurs due to the effect of unbalanced centrifugal forces of the spring with increased transmitted power and speed, which reduces its life. The aim of the invention is to increase the resource by reducing the wear of the surfaces of the contacting elements. The goal is achieved due to the fact that the clamping device is equipped with a driver, made in the form of a sleeve having an outer circular edge with radial protrusions placed in the radial grooves of the separator, while the driver is mounted on the bearing on the leading vyyu and the other end of the torsion spring is fixed to the driver . FIG. 1 shows a longitudinal section of the freewheel mechanism; FIG. 2 is a section A-A in FIG. one; in fig. 3 is a view along arrow B in FIG. 1. The free-running mechanism has a drive shaft 1, provided with pads 2 with bores 3 and a rolling bearing 4 bearing on cherry 5 made in the form of a yoke, between which and pads 6 of the drive shaft 1 are installed cylindrical rollers 6, and a pressure device go from separator 7, driver 8 in the form of sleeve 9, having an external circular edge 10 with radial protrusions 11 entering the radial grooves 12 of the separator 7, and springs 13, the ends of which are fixed on the drive shaft 1 and the driver 8. Driver 8 mounted on drive shaft 1 on bearings 14. The input shaft 1 has a system of radial channels 15 for supplying oil to the pads 2 the drive shaft 1. 3kanalov openings 15 at sites offset from the lines of contact of the rollers 6 with a platform so that between the roller 6 and the platform 2 has been formed the oil wedge. The mechanism works as follows. When the drive shaft 1 rotates relative to the driven shaft 5 in the direction of arrow B, the shafts 1 and 5 are connected due to jamming of the rollers when the separator rotates under the action of the twisting torque of the springs 13, and when the drive shaft 5 is overdone it separating and wedging Rollers b o Simultaneously with an increase in the pitch of the drive shaft, the force flowing out of the openings 3 under the pressure of the pump and the centrifugal forces of the lubricant stabilizes the rollers. The centrifugal force arising from the rotation of the drive shaft and acting on the spring 13 is perceived by the driver 8, which evenly distributes the force on the rollers b through the seperator 7. The effect of the invention is to reduce the wear of the contacting elements of the one-way clutch and increase its service life. The invention The mechanism of free running, mainly of a helicopter rotor gearbox, comprising a drive shaft with pads, a driven shaft, made in the form of a yoke, cylindrical rollers located between the platforms of the driving shaft and the inner surface of the driven yoke, and a pressure device, made in the form of a separator, interacting with a spring torsion, one end of which is attached to the drive shaft, characterized in that, in order to increase the resource by reducing the wear of the surfaces of the contacting elements, the clamping device is equipped with a driver, made in the form of a sleeve, with an outer circular edge with radial protrusions placed in the radial grooves made on the separator, while the driver is mounted on the bearing on the drive shaft and the other end of the torsion spring is fixed on the driver. Sources of information taken into account during the examination 1. USSR author's certificate No. 283740, cl. F 16 T) 41/07, 1969.

2. The book Helicopter radar RV-3M, technical description. M., Voenizdat, 1975, p. 17; FIG. 14 (prototype)

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