RU144114U1 - DEVICE FOR CONVERTING ROTARY MOTION TO SUSTAINABLE - Google Patents

Abstract

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

A device for converting rotational motion into a translational, screw-containing housing, consisting of three body parts interconnected by screws and pins, a nut with an external conical surface fixed to the housing, threaded rollers installed in the housing with the possibility of planetary movement, the threads of which mesh with the threads of the screw and nut, and at the ends of which there are external gear crowns. The device is equipped with a split flare nut, a spacer ring, an inner conical surface is made at the base, which interacts with the tapered outer surface of the nut, a protrusion is made on the end surface of the front cover, which interacts with a groove on the end surface of the split nut.

3 ill.

Description

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

Known planetary roller screw drive, for converting rotational motion into linear, consisting of two body parts connected by screws and pins, inside of which are two conical collets and a thin-walled nut. When tightening the body parts, the conical collets are compressed in the radial direction, deforming the thin-walled nut. Thus, in the prototype device axial clearances are eliminated, thereby increasing axial stiffness and kinematic accuracy. (see patent RU 2392517, F16H 25/22, 2006.)

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

1. After passing the running-in period, the radial gaps in the device increase significantly, however, a single-walled thin-walled nut allows sampling of gaps only in a small and fixed range. Replacing a nut with another one of a smaller diameter is not possible due to the lack of assembly clearances before running in. This means that the nut must be run-in separately before being installed in the prototype device, which significantly complicates the assembly process.

2. The clearance sampling is controlled by measuring the idle torque. After that, the necessary position of the body parts relative to each other is not fixed by anything, allowing displacement of the parts during operation.

3. A thin-walled nut is fixed only in the axial direction, having a rotational degree of freedom under certain conditions (insufficient friction moment between the nut and collets), which negatively affects the kinematic accuracy of the prototype device.

4. Cone collets, providing compression of a thin-walled nut, have a large number of longitudinal grooves of small width on the forming surface. The manufacture of such parts is a complex process.

5. The manufacture of thin-walled nuts with precise multi-threading is also a complex technological task.

The objective of the invention is to eliminate axial and radial clearances in the device, which will provide high axial stiffness and kinematic accuracy by increasing the contact points between the threaded surfaces of the screw, rollers and nuts. Also, a real utility model should allow improving the frictional stability of the kinematic transfer function by increasing the reduced coefficient of friction and reducing slippage between the screw and the rollers. At the same time, the proposed design should simplify the manufacturing process of manufacturing parts of the device.

The problem is solved, the technical result is achieved by the fact that the device contains a screw, a housing and a nut fixed in the housing, threaded rollers are installed in the housing with the possibility of planetary movement, interacting with the screw and nut, in addition, the housing is made of three housing parts connected by screws and pins, the device is equipped with a split flare nut, a spacer ring, an inner conical surface interacting with the conical outer surface of the nut is made in the body part , a protrusion is made on the end surface of one of the body parts, interacting with a groove on the end surface of the split nut.

Figure 1 shows a device for converting rotational motion into translational, General view.

Figure 2 shows a longitudinal section of a device.

Figure 3 shows a split flare nut, General view.

A device for converting rotational motion into translational movement consists of a screw 1, a block of rollers 2, interconnected by two separators 3, a housing 4, a split nut 5, a spacer ring 6.

The housing of the device consists of the following parts: base 7, back cover 8 and front cover 9, interconnected by means of bolts 10 and pins 11. Part 7 has surfaces "A" for attaching the working body, a conical inner surface "B", designed for interaction with the conical outer surface of the nut, the end surface "B", for interaction with the end surface of the part 8. The part 9 has a protrusion "G" on the end surface, designed to prevent the nut from turning relative to the housing 4, interaction with the slot "D" on the end surface of the nut.

The split nut 5 has an outer conical surface "E" for interacting with the inner conical surface "B" of the part 7, the end surface "Ж", for interacting with the spacer ring 6, the end surface "Z" for interacting with the end surface of the part 9, groove "D" for interaction with the protrusion "G" of the part 9, the threaded surface "And" for interaction with the threaded surfaces of the rollers 2, a section "K" of a rectangular profile, made along a helical line along the generatrix of the conical surface.

In parts 8 and 9, gear crowns 12 are installed to prevent the rollers from slipping relative to the nut and rolling them out of the device case, wiper rings 13 protecting the device case from dust and dirt, covers 14, retaining crowns 12 and rings 13.

A distance ring 6 is installed in the device’s body, designed to control the degree of clearance sampling by changing the thickness, a split nut 5, rollers 2 interacting with gear crowns installed in parts 8 and 9, and threaded surfaces with a threaded surface of the screw. To coordinate the movement of the rollers, their cylindrical ends are connected by means of separators 3. All parts of the device body are interconnected by bolts 10.

Sampling of the gap is carried out by axial movement of the nut relative to the part 7 to the distance ring 6, while interacting with the outer conical surface with the inner conical surface of the part 7, the nut is deformed, reducing the average thread diameter to a value allowed by the thickness of the distance ring. When assembling the device, the thickness of the distance ring 6 is selected so that the value of the idle moment is within the required limits. After running in the parts of the device, the gap between them increases, to eliminate it, it is necessary to reduce the thickness of the distance ring and reassemble the device.

Claims (1)

A device for converting rotational motion into translational motion, comprising a screw, a housing and a nut fixed in the housing, threaded rollers are installed in the housing with the possibility of planetary movement, interacting with the screw and nut, characterized in that the housing is made of three housing parts connected by screws and pins, the device is equipped with a split flare nut, a spacer ring, the base has an inner conical surface interacting with the conical outer surface of the nut at the ends on the surface of the front cover, a protrusion is made, interacting with a groove on the end surface of the split nut.