SU1368510A1 - Device for joining hub with shaft end - Google Patents

Abstract

The invention relates to mechanical engineering and can be used in devices for transmitting a torque between a shaft and a wheel mounted on its end. The aim of the invention is to increase the reliability of fastening the hub at the end of the shaft of small diameter and simplify the design. The transmission of torque is provided by a key (Ø) 7 installed in the combined end grooves 2 and 5 of shaft 1 and hub 4. Ø 7 is made with a shank 8 for its centering placed in the hole of the nut (H) 6, which axially presses the hub to shaft. The elastic parts 3 of the shaft I, divorced in a free state, the SRT of a p lt G 6, and also facilitate the installation of the W 7. The projections 10 on the elastic lobes 9 of the shank 8, interacting with the free end of G 6, facilitate disassembly of the W 7. The wedge surfaces 11, made on the lateral surfaces of the end sections of the petals 9, interact with the elastic parts 3, additionally stop G 6 and carry out pressing Sh 7 to the end surface D 6. The goal is achieved due to the fact that the torque is transmitted and the nut is locked with ff by one element - W 7 without the use of additional means. 5 hp f-ly, 6 ill.

Description

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FIG.

The invention relates to mechanical engineering, and can be used in devices for transferring a torsional oment between a shaft and a wheel mounted on its end. The purpose of the invention is to increase reliability when attaching the hub to the end of the shaft of small diameter and simplifying the structure.

FIG. 1 shows the device; general form; Fig, 2 is the same, top view; in fig. 3 - the same, side view; in fig. 4 - a device with a key, the shank of which is made with elastic petals, provided with radially directed protrusions and wedge surfaces; FIG. 5 is a view A of FIG. four; Fig. 6 is an embodiment of a wedge surface.

The device comprises a shaft 1 with an end keyway 2, which divides the threaded end of the shaft into elastic parts 3, which are separated in a free state, the hub 4 of the attached part, for example, a gear wheel with an end keyway 5, aligned with the groove 2, fitted onto the centering the section of the shaft 1 and pressed by the nut 6 to the thrust collar of the latter, and the face key 7 installed in the indicated grooves, with a neutralizing shank 8 placed in the threaded hole of the nut 6 and the groove of the shaft 1, Spurs 8 can be made with elastic lobes 9 , R diagonally disengaged in the free state from the shaft axis, with the projections 10 interacting with the free end of the nut 6. A thread can be made on the peripheral parts of the projections 10, identical to the nut of the nut 6. surfaces 11, which can also be formed by bent end sections of elastic elements 9, In this case bent end sections can be made elastic.

The device is assembled and operates as follows.

The hub 4 is mounted on the centering section of the shaft 1 and after the combination of the end grooves 2 and 5, the face key 7 is inserted into the latter, ensuring the transfer of torque between the shaft and the hub, expanding the groove 2 to the end of the shaft 1,

2

the dilution of the spring parts 3, facilitates the passage of the non-working sections of the groove 2 by the key 7 and

end position. The nut 6, having overcome the resistance of the elastic parts 3, is screwed onto the threaded end of the shaft 1, and the hub 4 5 contacts the end face and presses the last to the stop element of the shaft. The key 7 is placed between the end surface of the nut and the bottom of the groove 5 of the hub with the minimum clearance provided by dimensional tolerances,

The shank 8 of the key 8 is located with a minimum guaranteed clearance in the hole of the nut 6, which achieves the position of the key 7 symmetrically with respect to the shaft axis and eliminates

0 with self-falling out of the latter when loosening the tension on its lateral facets. The elastic parts 3, as they return, return to their original position, cause a radial tension g in the thread that

5 ensures the locking of the nut 6 on the shaft 1.

The device is dismantled in reverse order, Dp facilitating the extraction of the key 7, especially when

0 making the groove 5 is deaf relative to the outer surface of the hub 4, tail: 8 keys are made with elastic lobes 9, which protrude 10, dropping onto the free

 Rec nuts 6, when screwing the latter with the watch, provide axial movement of the key, from the groove 5 following the nut and disassembling the joint, Dp increase the useful area, qi of contact

0 of the protrusions 10 with the end of the nut and to facilitate the assembly of the latter with the key 7 in the peripheral areas of the said protrusions, the thread is made identical to the thread of the nut. When the le9 desks 9 are brought together, the nut 6 is screwed onto the protrusions 10 and after the code from the contact of the threaded surfaces the protrusions are dropped onto the free end of the pin 11, executed by

50 on the side surfaces of the end sections of the petals 9, in the final phase of pressing the nuts to the hub, they come into contact with the lateral surfaces of the Superficial surface of the groove 2 to the iimoi-nk 7 in the next 55 minutes, the pressing pressure is pressed against the working end of the nut, which eliminates axial movement of the key while loosening the tension on the side key

connection and the occurrence of vibrations during the operation of the device, and also enhances the stopping effect by further expanding the elastic parts 3 with wedge surfaces 1I. The wedge surfaces can be formed by the bent end sections of the petals 9, whose elastic construction allows, due to the bending of the latter, to compensate for inaccuracies in the manufacture of the longitudinal dimensions of the shaft end and key shank elements responsible for creating the necessary amount of deformation of the spring parts 3 by wedge surfaces 11.

The application of the proposed device will allow reliable connection of the shaft of small diameter with the part of the type of wheel with a small hub. thickness without additional locking devices.

Claims (6)

1. Device for connecting the hub to the shaft end, comprising a shaft with a stop element, an end key installed in the combined shaft and hub grooves, and a fastening threaded element made in the form of a central nut and mounted on the end of the shaft with the possibility of contact with the key and the end surface hubs, characterized in that, in order to increase the reliability of fastening the hub to the end of the shaft of small diameter and simplify ten 15 685) 0 the construction, the key is located between the mutually reversed face surfaces of the nut and the hub groove and is made with a centering 1m. the shank located in the hole of the nut and the groove of the shaft, and the parts of the shaft formed by the groove are elastic and radially separated in a free state, 2. The device according to claim 1, characterized in that the shank of the key is made with elastic lobes radially diluted in a free state from the shaft axis and provided with radially directed heights arranged with contact with the free end of the nut. 3. The device according to claim 2, characterized in that a thread is made on the peripheral portions of the projections that are identical to the nut thread. 4. Device on PP. 2 and 3, which is characterized by the fact that the ends of the elastic petals are made in the form of wedge surfaces arranged with the possibility of contact with the walls of the groove of the shaft. 5. The device according to p. 4, mold-20 25 thirty feeling topics that wedge surfaces are formed by bent end sections of elastic elements. 6. A device according to claim 5, characterized in that the folded ends of the petals are made resilient. FI.1 fi.5 FIG. 6