SU1303767A1 - Expanding clutch - Google Patents

Abstract

The invention relates to the field of mechanical engineering and can be used in devices for transmitting rotation. The aim of the invention is to improve the performance by increasing the smoothness of the switch on and expanding the 1; 1e of the operational capabilities by allowing the control of its power circuit. This goal is achieved by placing on the sleeve 6 a centrifugal switching mechanism. It consists of a pressure disc (OD) 16 with supporting elements 14, a stop disc 11 and centrifugal weights arranged in the form of balls (W) 13 placed between them. A release spring 18 is installed between the protrusion 17 of the sleeve 6 and the pressure disc 16 6 is carried out with the help of a nut 7 and a driver 8 placed in an annular groove 9. The axial stroke of the ND 16 is controlled by a nut 19. When the coupling half 1 Ш 13 is accelerated under the action of centrifugal forces of the thrust disk 11 opo pnye elements 14 III 13 move ND 16 to the left. Due to the axial compression of the package of the leading friction disks 3 and the slaves 4, torque is transmitted to the driven coupling half 2. 1 Cp. f-ly, 2 ill. i (L So about with O) VI vifft

Description

1130

And the invention relates to machine. structure and can be used in devices for transmitting rotation.

The aim of the invention is to improve the performance by increasing the smoothness of switching on and expanding the operational capabilities of the coupling by providing the possibility of adjusting its power circuit,

Figure 1 shows a centrifugal clutch, longitudinal section; figure 2 - section aa in figure 1.

The centrifugal clutch contains a leading 1 and a driven 2 half coupling with the leading 3 and the driven .4 friction disks. On the half of the fork 1, the sleeve 6 is axially displaced by means of the guide pin 5. The sleeve 6 is axially moved by means of a nut 7 mounted on the threaded end of the coupling half 1 with a driver 8 placed in the annular groove 9 of the right angle

section, made on the sleeve 6. On

25

the sleeve 6 is mounted by means of the guide pin 10 with axial movement of the thrust disk 11, in the radial grooves 12 of which centrifugal weights are placed, made in the form of balls 13. The latter are installed 30 where h are lena with the ability to interact with supporting elements made in the form of balls 14 located in the axial seats 15 of the pressure disk 16. The pressure disk 16 is mounted for movement in the axial direction and for interfacing with a package of friction disks formed by the driving 3 and the driven 2 freaks during the movement of the pressure plate 16 to the left (Figure 1) the angle d is varied by sledunmtsemu law:

. eleven

  T-, a,.,

(3)

35

the distance between the centers of the balls 11 and 12 in the direction along the axis of rotation of the coupling;

d is the ball diameter 11 and 12 (the diameters are assumed to be equal). In the process of engaging the clutch, the size h increases, therefore, the angle increases. Therefore, taking into account expressions (2) and (3) by vision disks. Between the pressure plate 40, the axial force grows by squeezing 16 and the protrusion 17 of the sleeve 6 of the pack of the friction disks 3 and 4.

Thus, at the beginning of acceleration of the leading coupling half 1, the axial force is small, but as the speed increases, the axial force increases not only due to an increase in the centrifugal force of the balls 13, but also an increase in the projection of this force on the coupling axis by increasing the angle. This enhances the keys 10 of the pressure plate 16 and the pack-Q smoothness of engagement of the coupling, that of the friction disks 3 and 4, transfers the design of the coupling, and in particular

The pressure device is simplified due to the absence of a separator for balls 11, the function of which is performed by a stop disk 5 with sockets for balls 11.

In addition, the use of balls 14 as the supporting elements of the pressure disc eliminates the need for pressing spring 18 on the pressure plate, the axial rigidity of which is adjusted by means of a nut 19.

The centrifugal clutch operates as follows.

Torque from the leading coupling half 1 by means of key 5, sleeve 6,

with the half 2. When the half coupling 1 is accelerated, the balls 13 under the action of centrifugal forces move along the slots of the thrust disk 11 and, acting on the balls 14, move the pressure disk 16 to the left, compressing the springs 18. Due to the axial compression of the package of the friction disks 3 and 4, the transmission

torque on the driven hemofu Tu 2.,.

The torque transmitted by the clutch is determined by the equation

CR

C (F Fr, p).

(one)

where C

F.

- permanent coupling;

- axial force of compression of the package of the friction discs;

- spring force 15. The axial compressive force of the stack of friction discs 3 and 4 is determined by the equation

ETC

(H-p),

(2)

de h

where Rc is the centrifugal force of the balls 11; d is the angle of inclination of the tangent at the point of contact of the balls 11 and 12 to the axis of rotation of the coupling; r is the angle of friction.

In the process of moving the pressure disk 16 to the left (Fig. 1), the angle d changes according to the following law:

. eleven

  T-, a,.,

(3)

ke 16 curved support surface. This simplifies manufacturing technology and reduces the cost of the clutch as a whole. The coupling reduces friction losses, since the balls 13 and 14 have a high class of surface cleanliness.

The coupling is controlled to the required torque (at a constant nominal rotational speed) or to the required rated speed (with a constant torque transmitted by the coupling) by moving the nut 7 along the threads of the half coupling 1. In this case, the sleeve 6 changes its axial position on the coupling half 1, which leads to a change in the compressive force of the spring 18 and, according to expression (1), to a change in the torque transmitted by the clutch (at a constant speed) or to a change in the nominal switching speed Ufta (at constant torque).

The restoration of the stroke of the pressure disc 16 when switched on is performed by adjusting its axial position relative to the sleeve 6 with the nut 19.

Thus, to adjust the coupling, it is not necessary to disassemble it.

When turned on, the stroke of the pressure disc 16 is selected such that the angle d is at the extreme left position of the pressure disc 16 above the trainer angle P (to prevent seizure of the balls 13).

Claims (2)

Invention Formula 1. Centrifugal clutch, containing the driving and driven half couplings, friction discs, centrifugal switching mechanism, consisting of a pressure disc with supporting elements and a thrust disc mounted on the coupling half with axial displacement, from centrifugal weights placed between the pressure and stop discs with the possibility of interaction with the supporting elements of the pressure disc, as well as a pressing spring containing in contact with the pressure disc, characterized in that, in order to improve performance, by ysheni incorporation smoothness and spreading operational features, it is provided with a sleeve with a radial projection on the drive coupling half mounted for axial movement, pressure and hard disks are placed on the hub, wherein zhimya The relative spring is mounted between the pressure plate and the sleeve lug. 2. A coupling according to claim 1, characterized in that, in order to simplify the manufacturing technology, axial sockets are made in the pressure plate, and the supporting elements are made in the form of balls placed in the axial sockets of the pressure disk. sixteen 14 Editor L.Povkhan Compiled by I.Lukina Tehred L.Oleinik Order 1290/36 Circulation 812 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 , c „,,, in,.-h. Production and printing company, Uzhgorod, st. Design, k (ffuff.2 Proofreader A.Zimokosov