RU187986U1 - Device for converting rotational motion into translational - Google Patents

Abstract

The utility model relates to precision engineering, namely, devices for converting rotational motion into translational (hereinafter - the device).

The device contains a screw, threaded rollers made with gear rims at their ends, a split nut with an external conical surface, installed in the internal conical hole of the housing and fixed from rotation in it, front and rear covers connected with pins by pins, separators, wiper rings. The split nut is locked against rotation in the housing by a key installed in the groove in the internal conical hole of the housing and the through groove on the outer conical surface of the split nut. The housing has a threaded connection with special nuts securing the front and rear covers. Each lid contains gear crowns that engage with corresponding gear crowns at the ends of the rollers.

The design of the device allows you to adjust the axial and radial clearances in the threaded joints of the screw, threaded rollers and split nut during operation without dismantling and disassembling the device, which increases its reliability and performance.

Description

The utility model relates to precision engineering, namely, devices for converting rotational motion into translational.

A device for converting rotational motion into translational (patent for utility model No. 144114, authors Shtykh D.V., Stepenkina A.V., Zhdanova A.V., application no. 2013154541/11 of 12/09/2013).

The disadvantages of the device is a prototype for converting rotational motion into translational are:

1. After the running-in period, the gaps in the threaded mates of the screw, threaded rollers and the split nut increase significantly. To eliminate the gaps, it is necessary to dismantle the device from the working mechanism, unscrew the bolts, remove the back cover and replace the distance ring. As you can see, this is a very time-consuming process, requiring a long shutdown of the unit

2. When replacing the distance ring, foreign objects, dust, and dirt can get inside the device, which will subsequently affect its performance.

3. To eliminate the gaps, several sizes of distance rings are required.

The objective of the utility model is to eliminate axial and radial clearances in threaded joints of a screw, threaded rollers and a split nut with the possibility of their adjustment during operation without dismantling and disassembling a device for converting rotational motion into translational motion, which will increase its reliability and operational characteristics.

This goal is achieved by the fact that the device for converting rotational motion into translational, containing a screw, threaded rollers made with gear rims at their ends, a split nut with an outer conical surface, installed in the inner conical hole of the housing and fixed from turning in it, the front and the back covers connected to the housing by pins, separators, wiper rings, a split nut is fixed from turning in the housing by a key installed in the groove in the internal conical hole casing and a through groove on the outer conical surface of the split nut, the housing has a threaded connection with nuts that fix the front and rear covers, each cover contains gear rims that engage with the corresponding gear rims at the ends of the rollers.

The essence of the utility model is presented in the description and is illustrated in the figure, which shows a general view of the device for converting rotational motion into translational motion in section (hereinafter - the device).

The device consists of a screw 1, threaded rollers 2 (hereinafter referred to as the rollers) with gear rims 3 at their ends, interconnected by two separators 4, the housing 5, the split nut 6, the front 7 and the back 8 of the cover, connected to the housing by pins 9 and nuts 10, keys 11 and wiper rings 12.

The operation of the device is as follows.

When the screw 1 rotates, the rollers 2, making a planetary motion, are run on the screw and the split nut 6.

The equality of the angles of elevation of the threads on the rollers 2 and the split nut 6, allows the rollers to be rolled in without axial displacement on the split nut. The difference in the angles of the thread between the rollers and screw 1 leads to the displacement of the rollers in the axial direction when rolling them on the screw.

To synchronize the movement of the rollers 2 around the screw 1, the gears of the front 7 and rear 8 covers are engaged with the gears 3 at the ends of the rollers, and the separators 4 do not allow the rollers to slide.

The split nut 6 has an outer conical surface for interacting with the inner conical surface of the housing 5 and end surfaces for interacting with the end surfaces of the front 7 and rear 8 covers. The key 11, installed in the grooves on the outer conical surface of the split nut and in the inner conical hole of the housing, reliably fixes the split nut from turning in the housing, and the through groove on the outer conical surface of the split nut allows you to freely move the split nut in the axial direction.

The clearance in the threaded mates of the screw 1, rollers 2 and the split nut 5 is selected by axial movement of the split nut relative to the housing 5 in the direction of the rear cover 8 using nuts 10 having a threaded connection to the housing and in contact with the front 7 and rear 8 covers. When displacing the split nut 6, its outer conical surface interacts with the inner conical surface of the housing, the nut is deformed, reducing the average diameter of the thread. The pins 9 ensure alignment of the gear rims made in the covers between themselves and the body, and also prevent the covers from turning relative to the body.

When assembling the device, the clearance in threaded joints is controlled by the idle torque value on screw 1.

After running in the threaded surfaces of the parts of the device, the clearance in the joints increases. To eliminate it, it is necessary to loosen the nut 10 that fixes the back cover 8 and tighten the nut that secures the front cover 7 until the required idle moment is obtained on the screw 1. Next, the split nut is fixed in the housing by tightening the nut at the back cover. This method of adjusting the gaps allows the device to be serviced without dismantling it from the working mechanism and parsing, which will reduce the idle time of the unit and prevent pollutants from entering the device.

Wiping rings 12 protect the threaded surfaces of the device parts from dust and dirt during operation.

Thus, the use of the proposed utility model allows to eliminate axial and radial clearances in threaded joints of the screw, rollers and split nut with the possibility of their adjustment during operation without dismantling and disassembling the device, which increases its reliability and performance.

Claims (1)

A device for converting rotational motion into translational, containing a screw, threaded rollers made with gear rims at their ends, a split nut with an outer conical surface, mounted in the inner conical hole of the housing and fixed from rotation in it, front and rear covers connected to the housing with pins, separators, wiper rings, characterized in that the split nut is fixed from turning in the housing by a key installed in a groove in the internal conical hole of the housing and a through groove on the outer conical surface of the split nut, the housing has a threaded connection with nuts that fix the front and rear covers, each cover contains gear rings that engage with the corresponding gear rings at the ends of the rollers.

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