SU1204838A1 - Vehicle automatic centrifugal clutch - Google Patents

Description

The invention relates to vehicle engineering and can be used in automobiles, motorcycles, mopeds and other vehicles.

The purpose of the invention is to increase the durability of the clutch by reducing the wear of the friction elements.

Additional centrifugal weights, mounted on additional fingers and associated with plate thrusts with diametrically opposed friction centrifugal pads, change the mechanical clutch characteristics in such a way that the clutch slipping operation when moving the vehicle while maintaining the high-speed characteristics of the vehicle is reduced. This, in turn, reduces the wear of the friction elements and increases the durability of the clutch.

FIG. 1 shows the centrifugal coupling of the vehicle, a general view (section A-A in FIG. 2); in fig. 2 is a section BB in FIG. one; in fig. 3 shows the characteristics of the centrifugal clutches (curves I and 2) and the adhesion characteristic according to the invention (curve 3).

The automatic centrifugal clutch contains a driving flywheel 1 mounted on the end 2 of the engine crankshaft, a driven drum 3 mounted on the input shaft 4 of the gearbox. On the flywheel 1, fingers 5 and 6 are fixed, on which centrifugal friction pads 7 and centrifugal weights 8, pulled by springs 9 and 0, are respectively installed in the radial direction. The number of pads and weights, their weights and spring forces are determined by vehicle, engine parameters , transmissions, and a specified clutch characteristic. Each centrifugal friction block 7 with a plate 11 and screws 12 and 13 is connected with a diametrically opposite load 8. At the same time, the screw 12 is in the slot of the plate 11 with a clearance G.

Automatic centrifugal clutch of the vehicle operates as follows.

When the rotational speed of the driving element (crankshaft 2 of the engine) is increased to a certain value n (Fig. 3), the friction pads 7 under the action of centrifugal force overcome the force of the springs 9 and are pressed against the drum 3, transmitting torque using the pins 5 to the primary shaft 4 gear boxes. The centrifugal force acting on the weights 8 is balanced by the pre-tensioning force of the springs 10, and because there is no movement of the weights and the clearance is maintained, it is reduced by the amount of the radial displacement of the block 7, i.e. the latter at this time is moved by the action of said force. The moment of friction in the clutch in the range of rotational frequencies from P1 to Pg varies according to a parabolic law (Fig. 3, section ac of curve 3).

With further increase in frequency

rotating up to a certain value n, centrifugal weights 8 overcome the forces of the springs 10, which leads to movement of the weights and reduction of the gap to zero. The centrifugal weights 8 through the plate thrusts 11 begin to act on the friction pads 7, reducing the pressing force of the latter to the drum 3. The result is a decrease in the rate of friction torque increase in the clutch, which leads to a step change in the adhesion characteristic (Fig. 3) of its curve 3). At the same time friction in the frequency range of P | up to Pz more than the moment of friction at the coupling with the centrifugal characteristic passing through the maximum of the torque of the engine, and the work of the slip is

significantly less, despite a slight increase in the moment of friction during the engagement process. The value of maximally possible surmountable resistances remains the same, since the characteristics of both clutches pass through the maximum torque of the engine.

The use of the invention allows the vehicle to travel at lower speeds, at which there is no

skidding, which increases the durability of the clutch and reduces the clutch safety factor at the maximum engine crankshaft rotation frequency, therefore it protects the transmission C; dynamic loads.

This clutch design allows to reduce the slipping operation and, accordingly, the wear of the friction elements by 1.5-2.5 times, depending on the external speed characteristics of the engine.

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Claims (1)

AUTOMATIC CENTRIFUGAL CLUTCH OF A VEHICLE, containing a driving flywheel and a driven drum, friction centrifugal pads, fingers and tension springs, friction centrifugal pads mounted on the fingers with the possibility of radial movement, fingers fixed on the flywheel, and tension springs fixed with their ends centrifugal on the ends opposite to the ends of each other pads, characterized in that, in order to increase the durability of the clutch, it is equipped with additional fingers, centrifugal loads, additional with tensile springs and plate links with grooves, additional fingers mounted on the flywheel, centrifugal weights mounted on additional fingers with the possibility of radial movement, additional tensile springs fixed at their ends on opposing centrifugal loads, and plate links connecting friction $ g centrifugal blocks and inertial loads, and each centrifugal load is connected to the diametrically opposite I — friction centrifugal block. IV