SU1590747A1 - Overrunning clutch - Google Patents

Abstract

The invention relates to mechanical engineering and can be used in devices for coaxially connecting shafts when transmitting torque in one direction and disconnecting the kinematic chain when changing the direction of rotation of the driving link. The purpose of the invention is to simplify the manufacturing technology and increase durability. The clutch contains the drive and driven shafts (B), the clip and the means of wedging in the form of a ball (W) 4. At the ends B there are spiral-shaped grooves (SP) 7 and 8 of the opposite direction. At the ends of the driven B, a central blind hole 9 is made, the diameter of which is larger than the diameter of Ø 4, and the depth is equal to the depth of the joint venture. When the driver B rotates clockwise W 4, shifted by its own weight from the central position, moves along the inner surface of the hole 9 of the slave B and between the working surfaces 10 and 11. In the disconnected, no torque is transmitted. During the reverse rotation of the drive shaft W 4, under the action of centrifugal force, presses against the surface of the blind hole and if SP 7 and 8 coincide, it falls between the working surfaces 11 and 12. W 4 moves to the periphery of the SP 7 and 8. Torque is transmitted from the lead to the slave V. 5 Il.

Description

FSh.5

The invention relates to mechanical engineering and can be used in devices for coaxially connecting shafts when transmitting a torque in one direction and paccoei - joining a kinematic chain in the direction of rotation of a driving link.

The purpose of the invention is to simplify manufacturing technology and increase durability.

FIG. 1 shows the coupling, axial section; in fig. 2 - drive shaft, end view; in fig. 3 - driven shaft end view; in fig. 4 - the location of the ball in the free course; on FIG. 5 - the location of the ball at the initial moment of coupling of the shafts.

The clutch contains a leading 1 and a driven 2. Shafts, a holder 3 and a means of wedging in the form of a ball 4. At the end face 5 and 6 of shafts 1 and 2, spiral-shaped grooves 7 and 8 of opposite direction are made.

At the end 6 of the led. shaft 2 is made with a central blind hole 9 with a diameter greater than the diameter of the ball 4 and a depth equal to the depth of the groove, and associated with the latter.

The diameter of the blind hole, depending on the mass of the ball and the angular speed of the coupling, is determined from the formula

OE

, 2 P 2

-sh.

where F is the centrifugal force, reduced to the center of the ball; CO - angular velocity of rotation

bilge shaft; D - diameter of a blind hole on

the end of the driven shaft; d is the diameter of the ball;

m is the mass of the ball.

The earth's gravity Fj, acting on a ball, is determined by the formula.

  Guy, where R is the acceleration of the earth’s t goteni.

In order for the ball to enter the spiral-shaped groove of the driven shaft at a given angular speed, driving the shaft CO, it is necessary that the centrifugal force F be greater than the force of the earth's t Fotency, i.e.

„G, .y., R ,.

Q

five

0

five

0

five

From this equality, the diameter of the blind hole made at the end of the driven shaft is determined:

D d. -If.

From the blind hole 9, a spiral-shaped groove 8 begins. The working surfaces of the groove on the drive shaft are side surfaces 10 and 11, and on the groove of the driven shaft - side surface 12, and side surface 13 forms a smooth transition of the blind hole 9 to slot 8. The ends of the shafts are placed in the holder 3 having a smooth surface 14.

The clutch works as follows.

When the drive shaft is rotated clockwise (Fig. 4), the ball 4, displaced by its own weight from the central position, moves along the inner surface of the blind hole 9 of the driven shaft 2 and between the working surfaces 10 and 11 of the drive shaft 1, while the shafts rotate independently of each other. In this case, the clutch cannot transmit torque, the shafts are disconnected. The clutch works in idle mode, running.

With the reverse rotation of the lead

The shaft 4 also deviates from the central position and, under the action of sufficient centrifugal force, presses against the surface of the blind hole and, when the slots 7 and 8 coincide, falls between the working surfaces 11 and 12 (Fig. 5). Further rotation of the drive shaft in the same direction moves the lateral working surfaces 11 and 12 of the ball 4 to the periphery of the slots. When the ball is in the extreme position, it puts pressure on the ball, causing it to rotate. The clutch is in operation and transmits torque.

As soon as the rotation of the drive shaft changes its direction, the ball is pushed into the blind hole of the driven shaft and the kinematic chain is disconnected.

Claims (1)

The use of the invention allows to significantly simplify the manufacturing technology, significantly reduce the noise when the coupling is operating through smoother transitions from the blind hole to the groove surface, to increase the durability of the driven coupling half and the ball by more than 30% due to a significant reduction in their collisions where the grooves start. Invention Formula. eni The overrunning clutch, which includes the circumferential ends of the shafts of the shafts and the means of wedging in the form of a ball, while at the mutually facing ends of the shafts, is made in one spiral-shaped groove of the opposite direction. 747 five Yu located from the center to the periphery, and the ball is installed in the grooves of the shafts, characterized in that, in order to simplify the manufacturing technology and increase durability, at the end of the driven shaft there is a blind central hole with a diameter greater than the diameter of the groove, and a conjugate with the last one FIG. 2 FIG. i Physical 5 ten .four