RU2790844C1 - Friction wheel removal device - Google Patents

Abstract

FIELD: machine-building equipment.

SUBSTANCE: device contains a housing, clamping and power elements. The housing consists of two hollow cylindrical halves connected to each other by means of two bolts and a centralizer of a hollow cylindrical shape coaxially placed inside the upper part of the housing. Inside the centralizer, a thread is made and a bolt with a cone at the end is installed, which is used as a power element. On the two halves of the upper part of the side surface of the housing, two through holes are made, which provide fastening of the centralizer with bolts. A longitudinal inspection window is made on the side surface of one half of the housing. In the lower part of the inner surface of the housing, a clamping element is made in the form of an annular protrusion, which ensures the fixation of the friction wheel, and on the outer side there are fastening rings with a thread for connecting the two halves of the housing with bolts and nuts.

EFFECT: increase in the reliability of the process of dismantling the friction wheel while reducing the dimensions of the device and simplifying its design.

1 cl, 4 dwg

Description

The invention relates to mechanical engineering equipment, and in particular to devices for dismantling parts connected with an interference fit, under limited conditions for placing the device.

A friction wheel is a wheel with a groove or rim around its circumference that transmits motion to a drive belt or rope.

Known pullers that create a static traction force due to the translational movement of the screw in the nut or the piston in the hydraulic cylinder. The composition of the main elements includes a traction body (a screw or a hydraulic cylinder rod) and a traverse on which grips or rods are installed, capturing the pressed part.

Known puller for dismantling parts, containing a body with a hole and pivotally attached to it gripping paws, made in the form of two-arm levers, a power cylinder with a rod mounted for movement in said opening of the body, and a disk made with a contact zone with the corresponding arms of the levers and mounted on the body with the possibility of rotation about its axis (ed. St. SU No. 1593880, publ. 23.09.1990). The surface of the disk, on which the contact zone with the arms of the levers is located, is made concave, and the levers are mounted with the possibility of moving along the surface of the contact zone, which has spiral grooves or spiral protrusions on the end of the disk.

The disadvantages are: - the presence of a disk with a spiral groove at the end or a spiral protrusion on it, the placement of the contact zone of the disk spirals with the corresponding arms of the gripping levers on the end concave surface of the disk determines the increased dimensions and weight with low manufacturability of the puller;

- when the grippers are engaged with the removed part, elastic deformations of the grippers are possible, which are not compensated by anything, which reduces the reliability of the device and can lead to damage to the friction wheel.

Known puller for dismantling parts (patent RU No. 2149091, publ. 05/20/2000), containing a body with a hole mounted on the body by means of hinges gripping two-arm levers with hooks and inclined grooves for accommodating hinges, a power cylinder with a spring-loaded rod, mounted for movement in the opening of the housing, and a flat fist mounted with the possibility of rotation relative to the housing and made with identical working spiral surfaces evenly spaced around the perimeter. Moreover, each lever is installed with the possibility of interaction with the corresponding working surface of the fist and is spring-loaded towards the fist and the corresponding hinge. The disadvantages are:

- low reliability of the device due to the possible spontaneous rotation of the knuckle relative to the body due to the existing design of the contact zone of the knuckle spirals with the spherical ends of the thrust screws of the levers, possible self-jamming of the two-arm levers on the body hinges;

- the presence of a large number of parts determine the increased dimensions and weight, which reduces the manufacturability of the device;

- the complexity of the design in manufacturing;

- when clutching the grips from the friction wheel being removed, elastic deformations of the grips are possible, which reduces the reliability of the device;

- when dismantling the friction wheel and stuck parts, there may be a breakdown and damage to the part, since the friction wheel is not fully fixed, but only in the grips, at two points.

Known puller for dismantling pulleys for V-belt drives, containing a housing, clamping elements, power screw

(https://www.ozon.ru/product/semnik-klinowh-shkivov-153-mm-mastak-103-20004-363019195/?gclid=EAIaIQobChMI2ZaS0OGP9AIVR0CRBR2mJANrEAOYBCABEgLxyPD_BwE&sh=SzYZeiVF&utm_campaign=RF_Product_Shopping_Smart_newclients SSC&utm medium=cpc&utm_source=google). The clamping elements are made in the form of two paws.

The disadvantages of the device are:

- this device has large dimensions in width, which reduces the applicability in places with limited free space;

- the friction wheel is not fully fixed, but only in the places of grips, at two points, as a result, when dismantling stuck parts, there may be a breakdown and damage to the part, which reduces the reliability of the device;

- when installing to get a better hold, you can easily overtighten the grips when installing them and also damage the friction wheel.

The closest technical solution is a puller for dismantling parts from a shaft, containing a housing, on the inner surface of which, on the side of the dismantled wheel, an annular protrusion is made with the possibility of contact interaction with the said wheel, while the housing consists of two hollow cylindrical halves, a centralizer fixed on the housing, having a hollow cylindrical shape, coaxially located to the said body from the side opposite to the wheel to be dismantled, moreover, a thread is made inside the centralizer and a bolt with a cone at the end is installed for a force stop in the said shaft, and a longitudinal viewing window, made with the possibility of visual control of the dismantling (RU patent No. 116398, published 05/27/2012). The device for dismantling the shaft contains a screw with a right-hand thread, the body is placed on the screw and connected to it by means of the said thread and is made with a cylindrical cavity coaxial with the screw, at the free end of which there is a handle. One end section of the detachable part is installed in the cylindrical cavity of the body coaxially with the screw and is connected to the body by means of a thread.

The disadvantages of the device are:

- the device has large dimensions in width, which reduces the applicability in places with limited free space;

- the device cannot be used for pressing out parts close to the bodies of motors, gearboxes, since the removable washer is put on the drive shaft under the friction wheel, which reduces the reliability of the puller and limits the technological capabilities.

The technical tasks are to increase the reliability of the coupling of the device with the friction wheel, to reduce the dimensions, to simplify the design in manufacture and use, to expand the technological capabilities of the device when working in limited placement conditions and when pressing parts close to the bodies of engines and gearboxes.

Technical problems are solved by a device for dismantling a friction wheel from a shaft containing a housing, on the inner surface of which, on the side of the dismantled wheel, an annular protrusion is made with the possibility of contact interaction with the said wheel, while the housing consists of two hollow cylindrical halves, a centralizer fixed to the housing, having a hollow cylindrical shape coaxially located to said body from the side opposite to the dismantled wheel, wherein a thread is made inside the centralizer and a bolt with a cone at the end for a force stop is installed in said shaft, and a longitudinal viewing window, made with the possibility of visual control of dismantling.

What is new is that the said centralizer is placed inside the body, and its fastening to the body is made in the form of two, located in diametrically opposite directions, cylindrical branches with an internal thread, rigidly attached to the side surface of the centralizer and screwed into them with bolts passing through the corresponding through holes made in the side surface of the housing from the side opposite to the wheel to be dismantled, while the said annular protrusion is made with a shape corresponding to the clamped surface of the friction wheel, and with the possibility of providing clamping by the protrusion of the mentioned wheel, and on the outer surface of the housing from the side of the dismantled wheel, fixing rings are made with internal thread, in which bolts with corresponding nuts are installed to fasten the two halves of the housing, and the said viewing window is made in the side surface of one of the halves of the housing between the said through hole for the centralizer fastening bolt and to end of the housing on the side of the wheel to be removed.

In FIG. 1 shows a general view of the device.

In FIG. 2 shows a top view.

In FIG. 3 shows a side view without the centralizer installed.

In FIG. 4 shows a top view of the device (body half).

The device for dismantling the friction wheel contains a housing 1 (Fig. 1, 2) consisting of two hollow halves 2, 3 (Fig. 2) of a cylindrical shape, interconnected by means of two bolts 4 (Fig. 1, 2), for example M8- 10, and centralizer 5. The metal case 1 is made with an inner diameter that provides a tight connection with the outer diameter of the friction wheel, with a wall thickness of a cylindrical shape of 2-4 mm, a length of 90 to 140 mm, taking into account the distance from the end of the shaft to the friction wheel, which provides a reduction in size and expansion of the technological capabilities of the device when working in limited conditions of placement. The centralizer 5 is fixed on the body. The centralizer 5 is made of a hollow cylindrical shape, coaxially located to the body 1 from the side opposite to the dismantled wheel. Inside the centralizer 5, a thread is made and a long bolt 6 is installed (Fig. 1), for example, M10-16 with a cone at the end for a force stop in the shaft. The centralizer 5 is placed inside the housing 1, and its fastening is made in the form of two, located in diametrically opposite directions, cylindrical branches 7 (Fig. 2, 4) with an internal thread, rigidly attached to the side surface of the centralizer 5 and screwed into them bolts 4, passing through the corresponding through holes 8 (Fig. 3), made in the side surface of the housing 1 from the side opposite to the dismantled wheel, providing fastening of the centralizer and the side halves of the housing. The total length of the cylindrical branches and the outer diameter of the centralizer is equal to the inner diameter of the housing 1. The centralizer 5 is made in length, for example, 40-60 mm, which ensures installation inside the housing and fastening with bolts 4 through holes 8. The length of the bolt 6 depends on the friction wheel to be dismantled and the length of the shaft , it can be 20-55 mm longer than the body length.

In the side surface of one of the halves of the body 1 between the through hole 8 for the centralizer mounting bolt and the end of the body 1 on the side of the dismantled wheel, a longitudinal viewing window 9 is made (Fig. 1, 3), which allows you to visually control the process of dismantling the friction wheel, which increases the reliability of the device . On the inner surface of the body 1 on the side of the wheel to be dismantled, an annular protrusion 10 (Fig. 2, 4) is made with the possibility of contact interaction with the wheel. The annular protrusion 10 is made with a shape corresponding to the clamped surface of the friction wheel, and with the possibility of ensuring that the protrusion of the said wheel is clamped around the entire circumference and tightly fixed, while the load is distributed evenly on the entire wheel, as a result, when dismantling the stuck parts, the wheel is prevented from breaking and damaging, which increases the reliability of the device, and also provides the ability to use the device for pressing out parts close to the housings of engines, gearboxes, which increases the reliability of the device and expands the technological capabilities. On the outer surface of the housing on the side of the wheel to be dismantled, there are fastening rings 11 (Fig. 1, 2, 4) with an internal thread, in which bolts 12 with corresponding nuts 13 are installed to fasten the two halves of the housing.

The device improves the reliability of the coupling of the device with the friction wheel, reduces the dimensions, while simplifying the design in manufacture and use, and also provides the expansion of the technological capabilities of the device when working in limited conditions of placement and when pressing parts close to the housings of engines, gearboxes.

The device for dismantling the friction wheel from the shaft works as follows.

One half of the housing is sequentially installed on the friction wheel, aligning the outer surface of the wheel circumference with the annular protrusion 10, the lower part of the housing is clamped from the outside with the help of bolts 12 and nuts 13. body halves and are fixed with bolts 4. Centralizer 5, in addition to guiding the pressing out bolt 6, also acts as an additional fixator of body parts. Further, bolt 6 is screwed through the centralizer 5, which dismantles (presses out) the friction wheel from the motor shaft. The process is controlled through the viewing window 9.

The device provides an increase in the reliability of the coupling of the device with the friction wheel, a reduction in dimensions, while simplifying the design in manufacture and use, and also provides an expansion of the technological capabilities of the device when working in limited conditions of placement and when pressing out parts close to the bodies of engines, gearboxes.

Claims (1)

A device for dismantling a friction wheel from a shaft, comprising a housing, on the inner surface of which, on the side of the dismantled wheel, an annular protrusion is made with the possibility of contact interaction with the said wheel, while the housing consists of two hollow cylindrical halves, a centralizer fixed on the housing, having a hollow cylindrical shape , coaxially located to the said body from the side opposite to the wheel to be dismantled, moreover, a thread is made inside the centralizer and a bolt with a cone at the end for a force stop is installed in the said shaft, and a longitudinal viewing window, made with the possibility of visual control of dismantling, characterized in that the said centralizer is placed inside the housing, and its fastening to the housing is made in the form of two cylindrical branches with internal thread located in diametrically opposite directions, rigidly attached to the side surface of the centralizer and bolts screwed into them, passing through the corresponding transport holes made in the side surface of the housing from the side opposite to the wheel to be dismantled, while the said annular protrusion is made with a shape corresponding to the clamped surface of the friction wheel, and with the possibility of providing clamping by the protrusion of the mentioned wheel, and on the outer surface of the housing from the side of the dismantled wheel there are fastening rings with internal thread, in which bolts with corresponding nuts are installed to fasten two halves of the housing, and the said viewing window is made in the side surface of one of the halves of the housing between the said through hole for the centralizer fastening bolt and the end of the housing from the side of the dismantled wheel.

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