SU1237808A1 - Jaw safety clutch - Google Patents

Description

I

The invention relates to mechanical engineering and machine-tool construction, in particular to safety devices designed to limit the amount of torque transmitted by the reversing drive by disconnecting the drive during overloads.

The purpose of the invention is to increase reliability and durability by eliminating dynamic loads in the process of slipping the coupling half after operation by fixing the movable coupling half in the open position.

Fig. 1 shows a general view of the coupling, a longitudinal section in Fig. 2 shows section A-A in Fig. U. and Fig. 3 shows the position of the elements of the coupling after actuation.

The clutch consists of a shaft 1, at the end of which an asterisk 2 is freely mounted, a cam washer 3 (coupling half) is installed at the end of the asterisk, which is in engagement with a movable cam coupling half consisting of a cam washer 4 and a movable hub 5. The latter is made with the end surface 6 which is in contact with the end surfaces of a similar profile of the petals 7 of the collet 8. Its central opening of the collet 8 is mated with the end of the shaft 1. Petals 7 are formed by longitudinal slots and for the tool to enter Holes 9 are provided for making the collet. For adjusting the stiffness of the petals of the collet and, consequently, to adjust the torque limit of the coupling, there is an adjustment mechanism which consists of a female ring 10 and segments 1 The internal diameter of the ring 10 is equal to the external diameter of the collet 8 and the outer diameter of the segments to the inner diameter of the pedestals in the non-working area. The segments 11 are connected to the ring 10 by means of screws 12, which extend in slots between the petals.

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The clutch works as follows. In normal operation, cam washers 3 and 4 are engaged and the movable hub 5 is bounded from axial displacement by elastic lobes 7, and the inclined surface 6 of the hub 5. rests on working trapezoidal ends and an asterisk 2 with a cam washer 3 tends to rotate in the same direction. In this case, the power equilibrium is broken under the action of the increased moment

15, the cams of the washer 4 are disengaged from the cams of the washer 3, while the movable hub 5 is displaced to the left (FIG. 3) and the ends of the elastic petals of the collet located on

20 of the inclined surface 6, under the action of the increased axial force arising in the cam gearing, diverges in the radial direction and moves from the inclined surface 6

25 to the subsequent cylindrical section of the hub 5. When this occurs, the half coupling and the moment transfer from the leading coupling half to the bushing occur. Moy is terminated. After that, the drive

30 stop, eliminate the causes of the overload, and then with a simple axial displacement of the movable hub 5 to the right, the cam washers 4 and 3 are brought into engagement, after which the clutch is again in a healthy state. The magnitude of the axial force for moving the driven half coupling to the right should be somewhat greater than the frictional force in the zone of contact between the petals and the hub. Stiffness of petals 7, co35

40

45

The torus is connected with the length L of their cantilever part, which is preliminarily adjusted by axial displacement of the ring 10 with segments 11.

The proposed coupling ensures guaranteed and quick disconnection of the coupling halves during an overload, as well as is convenient in operation, i.e. when returning the coupling elements to their original working position.

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Compiled by V. Ivanov Editor I. Segl nick Tehred L. Oleygik Proofreader V. Sinitska

Order 3270/36 Circulation 880 Subscription

VNSHSHI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

Claims (2)

1. CAM SAFETY COUPLING, containing two flange coupling halves, pressed one against the other by means of an axially mounted locking link with elastic elements, and a mechanism for adjusting the stiffness of elastic elements, characterized in that, in order to increase reliability and durability by eliminating dynamic loads in the process slipping of the coupling halves after operation, the closing link is made in the form of a collet, the end surfaces of the petals of which are made at an angle to the axis of the coupling and are arranged to interact ystviya with the end surface of the hub movable coupling half formed similar profile. 2. The coupling according to claim 1, characterized in that the ends of the petals of the collet are made with thickenings of the trapezoidal profile. Q SU, „. 1237808 t