RU2554020C1 - Thread-glue removable hub - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: thread-glue removable hub is made out of connected cone bushing with side cut along guide, having four thread holes for additional tightening screws, located at angle 90° to each of the thread holes, interchangeable driven element in form of the pulley or sprocket, containing four thread holes, located at angle 90° to each of thread holes, having internal cone hole, corresponding to the external surface of the cone bushing, that is made with possibility of tension by the clamp nut, fixing using the lock-ring and lock-nut. Between the mating surfaces: cylindrical - bushing and shaft, and cone - bushing and driven element a layer of anaerobic adhesive is applied with possibility to reduce its thickness by increasing of tension of the tightening screws and clamp nut during the hub assemblage.

EFFECT: improved engagement of design elements.

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Description

FIELD OF THE INVENTION

The invention relates to the field of mechanical engineering for joining together rotating parts.

State of the art

Known adhesive connection with an interference fit, having coaxial cylindrical parts of the shaft-hub type, designed to transmit torque (see, for example, the book of GB Iosilevich "Machine Details", p. 72. M .: Mechanical Engineering, 1988) .

The disadvantages include the inability to control the thickness of the layer of applied adhesive in the mating parts of the connection.

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 an 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, see, for example, (http://www.skf.com/portal/skf_en/home/products?maincatalogue=1&1a ng = en & newlink = 1_16_2).

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 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 coupling screws, and it is further provided 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 at an angle of 90 ° to each of the threaded holes, a tapered sleeve with a tapered outer surface having a radial slot wherein the inner diameter corresponds to the 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 tightening screws located at an angle 90 ° to each of the threaded holes, the conical sleeve is made with the possibility of being clamped by a clamping nut, fixing with a locking ring and a fixing nut, p We use either a pulley or an asterisk as a drive element (see Patent for invention RU 2402701 C1, cl. F16D 1/09, 10.27.2010 (D1))

The disadvantage of this hub is the need for high finish machining of the mating working surfaces of the conical sleeve and the drive element to create a higher interference fit.

Disclosure of invention

The glue-removable removable hub is made of a tapered sleeve joined together with a side cut along a guide having four threaded holes for additional tightening screws located at an angle of 90 ° to each of the threaded holes, an interchangeable drive element in the form of a pulley or sprocket containing four threaded holes, located at an angle of 90 ° to each of the threaded holes having an inner conical hole corresponding to the outer surface of the conical sleeve, which and with the possibility of tightening with a clamping nut, fixing with a locking ring and a fixing nut, and between the mating surfaces: cylindrical - of the sleeve and shaft, and conical - of the sleeve and the drive element, an anaerobic adhesive layer is placed with the possibility of reducing its thickness by increasing the tightness of the tightening screws and clamping nuts when assembling the hub.

A glue-removable removable hub is used in the connection of the drive shaft with the drive element for transmitting torque due to the adhesion forces of anaerobic adhesive between the shaft, the conical sleeve and the drive element that occur when the hub is tightened on the shaft. When performing a thread-adhesive removable hub when bonding mating surfaces with a tightening of the components, the thickness of the glue is minimized to the size of the nanoparticles, which increases the adhesion of structural elements and allows to increase the reliability of the connection and increase the torque.

Brief Description of the Drawings

In FIG. 1 shows a front view of a thread-glue removable hub.

In FIG. 2 shows a section AA in FIG. one.

In FIG. 3 shows a conical sleeve, a General view.

The implementation of the invention

The glue-removable removable hub (Fig. 1) contains a conical sleeve 1, covering a conical sleeve 1, a 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 tapered sleeve 1 is made in the shape of a truncated cone with a cylindrical hole 7 along the longitudinal axis corresponding to the diameter of the drive shaft 8, an outer diameter corresponding to the conical hole 9 of the drive element 2, and a side cut 10 along the guide. Between the mating surfaces: cylindrical - sleeve and shaft, and conical - sleeve and drive element (pulley) anaerobic adhesive is placed with the possibility of reducing its thickness by increasing the tightness of the clamping nut 3.

Assembly of the hub is as follows. Before assembly, anaerobic adhesive 11 is applied to the outer and inner surfaces of the conical sleeve 1, or (and also) to the surfaces of the shaft and hub mating with the sleeve and the drive element 2 is put on. Then, they are screwed onto the threaded part 12 on the conical sleeve 1 mounted on the drive shaft 8 , a clamping nut 3, while the drive element 2 is clamped to the conical sleeve 1 (Fig. 1), (Fig. 2).

Next, the tightening screws 6, by means of the threaded holes 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 13 and 14, since this the angle allows you to securely fix the conical sleeve 1 and the drive element 2 with a minimum and optimal number of clamping screws 6, and also make it possible to maintain symmetry in the removable hub, which does not create eccentricity when rotating the removable hub. Next, the snap ring 4 is mounted on the conical sleeve 1 and then the snap ring 4 is fixed with the fixing nut 5 and the tapered sleeve 1, the drive element 2, the clamping nut 3 assembled into a single unit.

Glue removable hub works 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 side section 10 along the guide, since the conical sleeve 1 is rigidly clamped to the drive shaft 8 and on the conical sleeve 1 itself the drive element 2 is rigidly fixed by means of applied anaerobic adhesive 11 and 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 13 in the conical thread a drive element ke 1 and the threaded openings 14 2, then collected on a removable integrally rezbokleevuyu hub this force acts. The connection is rotationally driven.

The tension of the clamping nut 3 reduces the thickness of the adhesive layer, up to the size of the nanoparticles, increases adhesion and thereby the magnitude of the torque. It should be noted that at the initial stage of tightening the adhesive can play the role of a lubricant, helping to carry out the process of mutual movements of the elements of the connection, which helps to minimize the thickness of the adhesive layers.

Claims (1)

The glue-removable removable hub is made of a tapered sleeve joined together with a side cut along a guide having four threaded holes for additional tightening screws located at an angle of 90 ° to each of the threaded holes, an interchangeable drive element in the form of a pulley or sprocket containing four threaded holes, located at an angle of 90 ° to each of the threaded holes having an inner conical hole corresponding to the outer surface of the conical sleeve, which and with the possibility of tightening with a clamping nut, fixing with a locking ring and a fixing nut, characterized in that between the mating surfaces: cylindrical - of the sleeve and shaft, and conical - of the sleeve and the drive element, a layer of anaerobic adhesive is placed with the possibility of reducing its thickness by increasing the tension of the tie screws and clamping nuts when assembling the hub.

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