SU894242A1

SU894242A1 - Friction coupling

Info

Publication number: SU894242A1
Application number: SU792813385A
Authority: SU
Inventors: Эдуард Петрович Выборнов; Юрий Семенович Середняков; Игорь Васильевич Иванив; Владимир Иванович Панченко
Priority date: 1979-08-30
Filing date: 1979-08-30
Publication date: 1981-12-30

Description

(5А) ФРИКЦИОННАЯ МУФТА(5A) Friction clutch

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Изобретение относитс к машино строению,в частности к устройствам дл передачи вращени .The invention relates to mechanical engineering, in particular, to devices for transmitting rotation.

Известна фрикционна муфта, содержаща две полумуфты, взаимодействующие через фрикционные диски, сжимаемые поршнем 1J.A known clutch is a clutch containing two coupling halves interacting through friction discs compressed by a piston 1J.

Недостатком муфты вл етс большой расход рабочей жидкости.The disadvantage of the coupling is the high flow rate of the working fluid.

Наиболее близкой к предлагаемой вл етс фрикционна муфта, содержаща корпус с опорным и фрикционными дисками и гидроцилиндром управлени с подпружиненным по оси.поршнем со сливным отверстием, расположенным против фрикционных дисков .Closest to the present invention is a friction clutch, comprising a housing with bearing and friction disks and a control hydraulic cylinder with a piston axially spring-loaded, with a drain hole located against the friction disks.

Недостатком данной муфты вл етс большое .усилие включени .The disadvantage of this coupling is a large switching force.

Цель изобретени - уменьшение усилий включени .The purpose of the invention is to reduce the switching effort.

Поставленна цель достигаетс тем,что во фрикцонном диске, обращенном к поршню, выполнены отверсти , а на контактирующей с ним поверхности поршн выполнен паз, сообщающийс с атмосферой, при этом минимальное рассто ние по дуге окружности между сливным отверстием и пазом больше ширины отверсти во фрикционном диске.The goal is achieved by having holes in the frictional disk facing the piston, and a groove in contact with the piston surface is made that communicates with the atmosphere, and the minimum distance along the arc of a circle between the drain hole and the groove is greater than the width of the hole in the friction disk .

На фиг. 1 изображена фрикционна муфта, разрез; на фиг. 2 - сечение А-А на фиг. 1; на фиг. 3 - сечение Б-Б на фиг. 1.FIG. 1 shows a friction clutch, a slit; in fig. 2 is a section A-A in FIG. one; in fig. 3 is a section BB in FIG. one.

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Муфта содержит корпус 1 с подпружиненнь1М относительно него отжимными пружинами 2 поршнем 3 гидроцилиндра управлени , имеющим сливное отверс15 тие k, перекрываемое фрикционными дисками 5, 6 и 7- Во фрикционном диске 5 по окружности на радиусе расположени сливного отверсти выполнены отверсти 8, а на соседней с диском The clutch includes a housing 1 with spring-loaded 1M relative to it squeezing springs 2 by a piston 3 of a control hydraulic cylinder having a drain opening k, blocked by friction disks 5, 6 and 7- In the friction disk 5 circumferentially at the radius of the drain hole there are holes 8, and on the adjacent disk a disk

Claims

20 5 of the friction surface 9, a groove 10 is made communicating with the atmosphere. The friction disks are located between the piston 3 and the support disk 11. The distance between the groove 10 and the drain hole along an arc of a circle of radius R is greater than the width h of the hole. The clutch works as follows. When the coupling is turned on (Fig. 1), a pressure fluid is supplied to the hydraulic cylinder. The force cylinder formed by the housing 1 and the piston 3. Under the pressure of the liquid, the piston 3 begins to move, compressing the squeezing, springs 2 and the disk pack 5, 6 and 7. Under the action of the forces of the speeds of the discs is synchronized. The drain hole C, intended to drain the fluid when the clutch is turned off, has a small flow area, therefore draining through it during clutch activation does not have a significant effect on the switching process. If, after synchronization, the friction disk 5 is set in such a way that the hole 8 coincides with the drain hole t, then the liquid will not flow out of the hydraulic power cylinder, since the groove 10 communicating with the atmosphere is displaced relative to the drain hole the bore widths 8. When the clutch is turned off (Fig. 1), in the event of a transition from one gear to another, the fluid supply line of the friction clutch being switched off is connected to the atmosphere. In the power hydraulic cylinder of the friction clutch disengaged, the pressure due to the centrifugal pressure of the liquid remains. Typically, the force acting on the piston from the centrifugal pressure of the fluid is greater than the force of the release springs 2, and the piston remains stationary, compressing the friction discs 5, 6 and 7. At the same time, the pressure in the hydraulic power cylinder of the friction clutch being engaged quickly increases and finally the moment of friction there (reduced to the shaft of the friction clutch disengaged becomes greater than the moment of friction of the friction clutch disengaged. As a result, in the clutch disengaged, the disk 5 begins to slip relative to the piston. " Passing the drain hole k, filling it with liquid. Moving further, the holes 8 are connected to a groove 10 that escapes into the atmosphere. The liquid from the hole 8 falls into the groove 10 and then B to the atmosphere. So each hole 8 transfers the liquid from the drain hole to the groove 10, which is connected to the atmosphere, increases the radius at which the level of the free surface of the fluid in the hydraulic power cylinder increases, and the force of the centrifugal pressure of the fluid on the piston drops. At some point, the force of the centrifugal pressure will become less than the force of the release springs and the piston will begin to move, freeing the friction discs. The clutch disengagement process ends when piston 3 is pressed against housing 1. Some difference is the case of clutch disengagement when changing from gear to neutral. In this case, if after the connection of the supply line with the atmosphere the engine revs and the revolutions of the car's wheels, brought to one shaft, coincide, the clutch remains engaged and rotates at the speed of transmission. If the revolutions do not coincide (for example, the driver has sharply reduced the fuel supply or a traffic jam), then due to the dynamic moment arising in the clutch due to different angular accelerations of the driven and driving parts, the friction disks 5 and 7 will slip relative to the disks 6 and the piston 3 After slipping, the draining process will proceed in the same way as the clutch disengagement process already described when changing from one gear to another. The proposed design of the friction clutch eliminates the disadvantages inherent in friction clutches with ball valves or clutches with permanently open drain holes. This clutch also has an advantage over the clutch with overflow drain holes, as it allows to reduce the costs of pressure force squeezing springs. Claims of the invention A friction clutch comprising a housing with a support and friction disks and a control hydraulic cylinder with a spring-loaded piston along the axis with a drain hole located against the friction disks is different because, in order to reduce the activation force, in the friction disk facing the piston

holes, and on the surface of the piston a groove is made that communicates with the atmosphere, and the minimum distance along the arc of a circle between the drain hole and the groove is larger than the width of the hole in the friction dis-

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Sources of information taken into account in the examination

.Hapo n D.T. Friction clutch automatic gearbox. M., Mashino5 Building, 1966, p. 107, fig. 50v,

2. US patent N 3 70388, cl. 192-87.15, 1969 (prototype).

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