RU2402701C1 - Removable hub for assembly of rotating element on driven shaft - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: removable hub consists of conic bushing, of driven element enveloping conic bushing, of grip nut, of retaining ring, of clamping nut and of coupling screws. The conic bushing has degree of taper 1: 10 and has a radial slit. Internal diametre of the conic bushing corresponds to diametre of the driven shaft, while its external diametre corresponds to a conic orifice of the driven element also made with degree of taper 1: 10. The driven element is clamped on the conic bushing. Four reinforced sectors at angle of 90° to each other are arranged on an external part of the conic bushing. The conic bushing and the driven element are tightened by means of the coupling screws running through corresponding threaded orifices on a back washer-like side of the conic bushing and on the driven element. Also the coupling screws are arranged at 90° to each other. The conic bushing is tightened with the grip nut and is fixed by means of the retaining ring and the clamping nut. A pulley or a sprocket can be used as a driven element.

EFFECT: simplified design of hub, raised reliability of fixation at dynamic loads.

2 cl, 5 dwg

Description

FIELD OF THE INVENTION

The invention relates to the field of mechanical engineering, a rotating element, for example a pulley or a gear wheel, on a drive shaft and to a removable hub necessary for mounting such a rotating element.

State of the art

Known removable hub, consisting of a radially cut conical element, which has an internal axial hole that allows you to put this element on the drive shaft, and the outer conical wall, and the mounting screws located on the peripheral part of the hub, allow you to fix it on a rotating element. Such removable hubs are marketed under the SKF trademark.

The disadvantages include the difficulty of manufacturing this design.

A removable hub is known, comprising at least one hub element having a radial slot, tightening screws for clamping said hub element on the drive shaft, and a split ring located between the drive shaft and the hub element to clamp the hub element on the drive shaft (see DE patent No. 1265506, 1968).

The disadvantage of such a hub is that the hub and removable elements must be made of the same material and with the same hardness, otherwise the hub or element will crumple. The difficulty of manufacturing this design.

Closest to the technical nature of the present invention is a removable hub for mounting a rotating element on the drive shaft, containing at least one hub element having a radial slot, tightening screws for clamping the specified hub element on the drive shaft, and a split ring, located between the drive shaft and the hub element, to ensure the clamping of the hub element on the drive shaft, and the hub element includes a split part with a conical outer surface, extending with a rectilinear split part of a smaller diameter, in addition, there is a nut and a split ring with a conical outer surface clamped on the rectilinear part of the hub element with a nut in a position symmetrical to the specified conical surface of the split part of the hub with a conical outer surface relative to the vertical plane, providing access a rotating element on both sides, and the split ring has a radial slot, while its inner diameter corresponds to the diameter of the drive the bottom shaft, and the outer diameter corresponds to the hole of the hub element, and the split ring is coated, and the rotating element mounted on the drive shaft using a removable hub, containing an inner wall having two conical parts symmetrical about the middle vertical plane, to ensure the installation of the removable hub on both sides of the rotating element, the first conical part of this rotating element contains two threaded half-holes located at an angle of 190 ° to each other and used to fix the removable hub when it is mounted on the first side of this rotating element, the first conical part also containing one blind half-hole, used to extract the removable hub and located at an angle of 95 ° to each of the threaded half-holes, the other of the two conical parts two threaded half-holes located at an angle of 190 ° to each other and used to fix the removable hub when it is mounted on the other side of the rotating element, and the other conical part contains about the bottom is a blind half-hole that serves to remove the removable hub and is located at an angle of 95 ° to each of the threaded half-holes, and contains threaded holes for additional screws, which may have a diameter different from the diameter of the clamping screws (see Patent for invention FR No. 2175733, IPC F16D 1/09, 2001).

The disadvantages of such a removable hub include the difficulty in manufacturing this design, a large number of hub components, a long time for mounting and dismounting the structure, asymmetric arrangement of the clamping screws, which creates an eccentricity.

Disclosure of invention

The technical result that can be achieved using the present invention is reduced to ease of manufacture, improving the reliability of fixation from radial displacement and rotation under dynamic loads, reducing the time and complexity of assembling and disassembling connections and repairs of machines, such as a combine harvester, while ensuring optimal clamping to transfer the necessary torque in this case, which allows to rationalize the nomenclature of the hubs and, accordingly, rationalize their production, changing the components form the conical sleeve and form fit.

The technical result is achieved using a removable hub for mounting a rotating element on a drive shaft containing coupling screws, and it is additionally equipped with an interchangeable drive element having an internal conical bore with a taper of 1:10 corresponding to the outer surface of the conical sleeve containing four threaded holes located under angle of 90 ° to each of the threaded holes, a conical sleeve with a conical outer surface having a radial gap, while the inner diameter there is a diameter of the drive shaft, and the outer diameter corresponds to the hole of the drive element, equipped with four hardened sectors, located at an angle of 90 ° to each of the hardened sectors, the rear washer-like side containing four threaded holes for additional coupling screws, located at an angle of 90 ° to each of threaded holes, the conical sleeve is made with the possibility of clamping the clamping nut, fixing with a locking ring and a fixing nut, moreover, as a drive element They use either a pulley or an asterisk.

Brief Description of the Drawings

Figure 1 - shows a removable hub, General view, as a drive element - a pulley.

Figure 2 is the same, a section aa in figure 1.

Figure 3 is the same, a conical sleeve, General view.

In Fig.4 - the same taper.

Figure 5 is the same drive element, General view.

The implementation of the invention

The removable hub for mounting the rotating element on the drive shaft (Fig. 1) contains a conical sleeve 1, covering the conical sleeve 1, the drive element 2 (a pulley is shown as a drive element), a clamping nut 3, a lock ring 4, a fixing nut 5, and tightening screws 6 .

The conical sleeve 1 is made with a taper of 1:10, has a radial slot 7, and the inner diameter corresponds to the diameter of the drive shaft 8, and the outer diameter corresponds to the conical hole 9, with the same taper of 1:10, while the drive element 2 is mounted on the drive shaft 8 (belt or chain drive in FIG. Not shown). Next, the drive element 2 is put on the conical sleeve 1. Then, the clamping nut 3 is screwed onto the threaded part 10 on the conical sleeve 1, while the drive element 2 is clamped on the conical sleeve 1 with four hardened sectors 11 located at the outer side thereof, located at an angle of 90 ° to each of the hardened sectors 11, which are pressed into the conical hole 9 of the drive element 2 due to high hardness, forming a micro-slotted connection with the necessary interference. This number of sectors is both minimal and optimal, obtained from experimental data, to ensure tightness and the formation of a micro-spline connection, and therefore an angle of 90 ° allows the hardened sectors 11 to be placed symmetrically and at the same distance from each other, and the sectors are obtained by hardening by an electric arc hardening apparatus EDU-1, this is achieved by direct contact of the graphite electrode with a conical sleeve and its constant movement along the axis. Next, the tightening screws 6 through the threaded holes 12 on the rear washer-shaped side 13 in the conical sleeve 1 and the threaded holes 14 in the drive element 2 tighten the conical sleeve and the driving element 2. The tightening screws 6 are located at an angle of 90 ° to each of the threaded holes 12 and 14, since this angle allows you to reliably fix the conical sleeve 1 and the drive element 2 with a minimum and optimal number of clamping screws 6, as well as maintain symmetry in the removable hub, which does not create an eccentricity when rotating the removable stupa tzu. Next, a snap ring 4 is mounted on the conical sleeve 1, and then the lock ring 4 and the tapered sleeve 1, the drive element 2, the clamping nut 3 are assembled into a single whole.

The removable hub operates as follows.

The torque T is transmitted to the drive shaft 8 through an external source (belt or chain drive) T. The rotation force F acts from the drive shaft 8 to the conical sleeve 1 having a radial slot 7. Since the conical sleeve 1 is rigidly clamped to the drive shaft 8, a on the conical sleeve 1 itself, the drive element 2 is rigidly fixed by means of a clamping nut 3, a locking ring 4, fixing nuts 5 and coupling screws 6 located at an angle of 90 ° to each of the threaded holes 12 on the rear washer-shaped side 13 in the conical sleeve 1 and the threads holes 14 in the drive element 2, then the assembled into a single detachable hub acts the same force. The connection is rotationally driven.

The taper 1:10 allows you to reliably lock the connection, eliminates the relative radial and axial movements of the parts to be joined, since this taper is optimal, obtained from experimental data. The taper values of 1: 9, 1: 8, 1: 7 and further did not give a complete result, since they had insufficient compression of the conical sleeve 1 on the drive shaft 8, and the taper values of 1:11, 1:12, 1:13 and further had insufficient pressing in of the hardened sectors 11 on the conical sleeve 1 in the conical hole 9 of the drive element 2. The hardness of the material of the conical sleeve 1 is greater than or equal to the hardness of the drive element 2, the hardness of the hardened sectors 11 is higher than the parts to be joined. Due to this, the removable hub reliably stops the connection from radial movement and from turning, with the possibility of installation on an unprepared shaft.

The invention in comparison with the prototype and other known technical solutions has the following advantages:

- increases the reliability of fixation from radial displacement;

- increases the reliability of fixation from axial displacement;

- eliminates cranking under dynamic loads, with the ability to quickly assemble and disassemble the connection;

- provides constancy of the contact area during load transfer;

- increases the connection resource;

- provides fast and universal interchangeability of drive elements;

- tightens the removable hub and drive shaft without creating an eccentricity;

- allows you to install a removable hub on an unprepared shaft.

Claims (2)

1. A removable hub for mounting a rotating member on a drive shaft, comprising tightening screws, characterized in that it is further provided with an interchangeable drive member having an internal conical bore with a taper of 1:10 corresponding to the outer surface of the conical sleeve containing four threaded holes located beneath 90 ° to each other, a conical sleeve with a conical outer surface having a radial gap, while the inner diameter of the conical sleeve corresponds to the diameter of the drive ala, and the outer diameter of the conical sleeve corresponds to the hole of the drive element, the sleeve is equipped with four hardened sectors located at an angle of 90 ° to each other, a rear washer-like side containing the four threaded holes for these coupling screws located at an angle of 90 ° to each other, while the conical sleeve is made with the possibility of clamping the clamping nut, fixing with the locking ring and the fixing nut. 2. The removable hub according to claim 1, characterized in that either a pulley or an asterisk are used as a drive element.

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