UA138341U - FLANGE-FINGER ELASTIC SAFETY COUPLING WITH FREEWAY CHOICE - Google Patents

Abstract

Coupling flange-finger elastic safety with freewheel selection, containing two half-couplings in the form of hubs at the ends with flanges with a circular shape and in one half-coupling at the end of the flange rigidly placed fingers axisymmetrically and at the same distance from the axis of rotation, according to the utility model protruding above the end surface of the flange of the coupling, put sleeves with the possibility of rotation around the fingers and contact with the springs so that the sliding friction in contact with the springs is replaced by rolling friction.

Description

The useful model belongs to mechanical engineering and can be used to connect the shafts of mechanisms and machines, as well as to prevent kinematic chains from impact and dynamic overloads.

Well-known flanged couplings (see the book V.O. Malashchenko Drive couplings. Designs and examples of calculations: Study guide. Lviv: Publishing House of the National University "Lviv Polytechnic", 2006. - 196 p., fig. 2.7, p. 27) , which contain two half-couplings, in the form of hubs with flanges, connected to each other by bolts, placed in holes with a gap - one option, and placed in holes without a gap, the second option, which transmit torque due to frictional forces arising on the surface contact of half-couplings in the first version and directly with bolts that are under the influence of shear deformation in the second version and serve for a rigid connection of coaxial shafts.

The main disadvantage of such couplings is that they do not compensate for inaccuracies that arise due to a slight mismatch of the shaft axes when they are connected and transfer the load rigidly, which negatively affects the drive parts and the machine as a whole.

A known coupling (see patent of Ukraine for utility model Mo 129902, IPC E160 1/06, E160 1/08, E160 3/00, Byul. Mo 22, November 26, 2018), which contains two half-couplings in the form of polyhedra with flat faces and rigidly fixed fingers located in their corners.

The main disadvantage of this coupling is that due to the rigid linear contact of the fingers of one half-coupling with a straight or rounded or shaped section of the face of the second half-coupling, the torque will be transmitted instantly, and, in addition, due to the gaps between them, shocks occur, in the case of lined contacts, for example, with rubber, due to the linear contact deformation that occurs between the fingers and the flat areas of the faces, the lining has a short durability.

The applicant is aware of a flange-finger elastic safety coupling with stroke selection, which was selected as the closest analogue and contains two half-couplings, made in the form of hubs on the end face with a flange with a circular outline, on the cylindrical surface of the flange of one half-coupling, an annular groove is made, in which the springs are arranged axisymmetrically and fixed with pins with the possibility of extending along the bottom of the annular groove, and at the end of the flange of the second half-coupling, fingers are pressed into holes, made axisymmetrically at the same distance from the axis of rotation, so that when selecting a stroke and transmitting a torque, the fingers contact the springs.

The main disadvantage of this clutch is that with frequent sliding of the fingers on the springs during the performance of safety functions, the contacts of the fingers and the springs are quickly activated due to sliding friction.

The useful model is based on the task of increasing the durability of springs and clutch fingers by replacing contact sliding friction with rolling friction.

The technical result is achieved by the fact that on the fingers protruding above the end surface of the half-coupling flange, bushings are placed with the possibility of rotation around the fingers and their contact with the springs so that the sliding friction in contact with the springs is replaced by rolling friction.

The proposed flange-finger elastic safety coupling with free play selection has a longer life due to the replacement of sliding friction by rolling friction in the sleeve-spring contact.

The essence of the useful model is explained by the drawings, where: in fig. 1 shows a flanged-finger elastic safety coupling with free play selection, general view, longitudinal section; in fig. 2 shows what in fig. 1, view A, before work; in fig. It is shown that in fig. 1, view

A, free selection and the start of the working course; in fig. 4 shows what in fig. 1, view A, when the safety function is performed, the sleeve on the finger turns on the spring and deforms it - sliding friction is replaced by rolling friction; in fig. 5 shows what in fig. 4, section B-B.

The flange-finger elastic safety coupling with the choice of free play consists of two half-couplings 1 and 2. Half-coupling 1 is made in the form of a hub З and a flange 4. On the cylindrical surface of the flange 4, an annular groove 5 is made, in which the springs 6 are axisymmetrically placed and fixed by pins 7 with the ability to elongate along the bottom of the groove 5 during radial deformation.

Semi-coupling 2 is made in the form of a hub 8 and a flange 9, in which axially symmetrically rigidly fixed, for example, pressed fingers 10 at the same distance from the axis of rotation of the coupling. Bushes 11 with the possibility of rotational movement are placed on the fingers 10 protruding above the end of the flange 9.

The flange-finger elastic safety clutch with free play selection is assembled as follows. Springs 6 are inserted into the annular groove 5 of the half-coupling 1 on the flange 4 and fixed with pins 7 with the possibility of elongation from radial deformation. Fingers 10 with installed bushings 11 with the possibility of rotational movement are pressed into the holes on the end face of the flange 9 of half-couplings 2, placed axisymmetrically and at the same distance from the axis of rotation. Semi-couplings 1 and 2 are brought together by the ends of flanges 4 and 9 so that with relative rotation and selection of free travel, bushings 11, installed on fingers 10, come into contact with springs 6. The coupling is ready for work.

The flange-finger elastic safety clutch with free play selection works as follows. When the torque is transmitted from the half-coupling 1 to the half-coupling 2, free travel is selected and the springs b contact the bushings 11 installed on the fingers 10. It will transmit the permissible torque. When the torque exceeds the permissible, under the action of the bushings 11 placed on the fingers 10, the springs 6 are radially deformed and elongated. At this time, the bushings 11, placed on the fingers 10, roll over the springs b - the safety function of the clutch is performed. When the torque is reduced to the permissible level, the springs 6 take their initial shape. The clutch transmits the permissible torque. Due to the deformation of the springs 6, the torque is transmitted gently.

The proposed flange-finger elastic safety coupling with free play selection has a longer life due to the replacement of sliding friction with rolling friction in the sleeve-spring contact.

Claims (1)

USEFUL MODEL FORMULA A flange-finger elastic safety coupling with free play selection, containing two half-couplings in the form of hubs on the ends with flanges with a circular outline and in one half-coupling on the end of the flange the fingers are rigidly placed axisymmetrically and at the same distance from the axis of rotation, which differs in that , that on the fingers protruding above the end surface of the half-coupling flange, bushings are placed with the possibility of rotation around the fingers and in contact with the springs so that the sliding friction in contact with the springs is replaced by rolling friction. КИ как и мое ки кс вожожож ож аск жжожжжжсюсулкти и ЦП и AND THIS о deetekya | and 7 HY NI KY. r E She sho; II them Z ren lo I y Fig. 1 beat /. g Ka dI s U What s vuh 7 i KU gy NI A x x; IZ also KhNY ot, G.Ya : y Ya y r ikh : nn Fig. 2