RU2756328C1 - Straight-running executive electromechanism - Google Patents

Abstract

FIELD: electrical engineering.

SUBSTANCE: invention relates to the field of electrical engineering and can be used for drives of various devices, mainly in aircraft. A straight-running executive electromechanism contains a housing on which a mechanism for converting electrical energy into mechanical energy is installed with a drive belt and pulleys connected to a screw with stops on bearings. A power nut and a bearing clamping nut with a sleeve are installed on top of the screw, and a tip is installed on the end part of the power nut. In addition, a protective pipe is installed on top of the power nut, on which inductive end switches are fixed. At the same time, a drive belt tension control device fixed to the housing, a lubrication supply device fixed to the tip, and a mechanical locking device for the bearing clamping nut are additionally installed. Technical result is achieved due to a power nut with an internal slot groove, inside which a half coupling is installed.

EFFECT: straight-running executive electromechanism improvement.

1 cl, 1 dwg

Description

The invention relates to the fields of aircraft and electrical engineering and can be used for drives of various devices, mainly on aircraft.

Known drive electromechanism [Patent RU 2277195 C2. - IPC: F16H 1/48 (2006.01), В64С 13/50 (2006.01) publ. May 27, 2006 Bul. No. 15], containing an electric motor with a built-in electromagnetic brake clutch, a gearbox and a block of microswitches, as well as a sun wheel of the first stage of a three-stage planetary gear with a common epicycle with a supporting cylindrical spike, and a carrier on which the satellites of the first stage are located and a sun wheel of the second stage, made with an end bore located on the side of the spike, coaxial with the carrier, in which a sleeve of antifriction material is pressed in and the spike is movably installed.

The disadvantage of this device is the low reliability of the output link mechanism. This is due to the fact that in the device for the reciprocating movement of the output link is provided by the ball screw, which has a limitation in length and speed of rotation, and also, due to the complexity of manufacture and low maintainability, is very impractical when operating in a drive electrical mechanism.

Closest to the claimed device is a linear actuator [Patent RU 2297088 C1. - IPC: H02K 7/06 (2006.01), H02K 7/10 (2006.01) publ. 10.04.2007 Bul. No. 10], containing a housing on which an electric motor with a flange and a screw on bearings with pulleys and a drive belt are installed, a protective tube and a bushing with a rod with a power nut and a tip located in its guide, a key of the rod anti-rotation device, a bearing clamp nut, inductive end switches, in addition, the mechanism is equipped with a device for adjusting the tension of the drive belt, a lubricant supply device and a device for mechanical locking of the bearing clamping nut in the housing, moreover, stops are introduced in the inner part of the protective pipe on both sides, a longitudinal groove, a radial hole and an outer collar are made at the end of the rod, installed with the ability to interact with the stops, and an insert is inserted into the longitudinal groove and the radial hole, which covers the key with its lateral surfaces and is equipped with a protrusion located in the keyway of the power nut located inside the stem, while the intermediate sleeve is made one-piece and is connected to the fixing screw a bearing element installed at the location of any bearing.

The disadvantage of this device is the low reliability of the operation of the main assemblies and mechanisms, since the reciprocating movement of the tip is provided by the key and the insert, which fix the nut and stem from rotation, which are protected from rotation only at one point of attachment of the key and insert. Consequently, when the device is loaded, an increased bending moment will occur, which will entail the incorrect operation of all structural elements and, as a result, lead to a breakdown of the device.

The technical result of the invention is to improve the reliability of the linear actuator electromechanism.

The specified technical result is achieved by the fact that the linear actuator contains a housing on which a mechanism for converting electrical energy into mechanical energy is installed with a drive belt and pulleys connected to a screw with stops on bearings, a power nut and a nut for clamping bearings with a sleeve are installed on top of the screw. of the end part of the power nut, a tip is installed, a protective tube is installed over the power nut, on which inductive end switches are fixed, while additionally there is a device for adjusting the tension of the drive belt attached to the housing, a lubricant supply device fixed on the tip, and a device for mechanical locking of the bearing clamp nut , in addition, the power nut is made with an internal spline groove, inside which a coupling half is installed, while the nut is installed between the tip and the protective pipe, also between the nut and the screw, a mechanism for converting the rotational movement is installed on the end part of the screw, a holding mechanism is installed, on top of which, on the end part of the mechanism for converting rotational motion into translational, a flange and adjusting elements are installed, while elastic elements are installed between the flange and the adjusting elements.

The essence of this invention lies in the fact that the power nut is made with an internal spline groove, inside which a coupling half is installed, while the nut is installed between the tip and the protective tube, also between the nut and the screw, a mechanism for converting rotational motion into translational is installed, and on the end part of the screw a holding mechanism is installed, on top of which, on the end part of the mechanism for converting rotational motion into translational movement, a flange and adjusting elements are installed, while elastic elements are installed between the flange and adjusting elements.

In analogs and a prototype of a linear actuator, the reliability of operation is at a low level, due to the design features of the executive units, in particular, the mechanisms of the output link.

In the invention, improving the reliability of the mechanisms is carried out as follows.

An increase in the reliability of the linear actuator electromechanism is achieved by installing a mechanism for converting rotational motion into translational motion, which is fixed between the power nut and the screw. The mechanism for converting rotational motion into translational motion can consist of: screw-nut [Transfer screw-nut: tutorial / comp. IN. Varganov, M.V. Avvakumov, M.V. Kolychev, V.M. Grebennikov. V.A. Romanov; SPbGTURP. - SPb., 2015. - 57 p.], A keyed connection connecting the power nut and a protective pipe, and a screw connection connecting the power nut with the tip. Due to the fact that the power nut and the screw-nut are in tight engagement over the entire contact surface, the screw-nut ensures the transfer of torque to the power nut with virtually no loss. Keyway and screw connections of the power nut with other elements of the undercarriage of the device will ensure uniform longitudinal reciprocating movement of the tip during operation of the linear actuator.

As a result, by installing the mechanism for converting rotational motion into translational motion, the bending moment applied to the screw during operation of the linear actuator will be minimal due to the uniform distribution of the load between the power nut, protective tube, tip and the mechanism for converting rotational motion into translational motion. Consequently, the operation of all structural elements will be correct, and the reliability of the entire device is at a high level.

Improving the reliability of the linear actuator electromechanism is achieved by the fact that the power nut is made with an internal splined groove, in which the half-coupling is installed [https://voronezh.yavitrina.ru/product/ / jgiqDvQgSZLoy6NuT4nTlg. Date of treatment: 15.10.2020]. This ensures the absence of idle rotations of the power nut around the screw axis, which can occur under heavy loads on the screw and the tip, and, therefore, lead to incorrect operation and damage to the device. During operation of the linear actuator, the installed half-coupling interacts with the holding mechanism, which is installed on the end part of the screw. The holding mechanism can be made in the form of a retaining ring and a separator. The half-coupling, the retaining ring and the separator create a new mechanical connection, which, during the operation of the device, ensures the longitudinal movement of the tip without the possibility of its rotation. Consequently, the tip will not receive dynamic, alternating torsional loads, which lead to accelerated wear and possible breakdowns of the device during its operation.

Due to the prevention of idle turns of the power nut around the screw axis and the creation of a new mechanical connection, which excludes the possibility of rotation of the tip, high reliability of the electromechanism and its main units and mechanisms during their operation is achieved.

Also, an increase in the reliability of the linear actuator electromechanism is achieved by installing a flange and adjusting elements, between which elastic elements are installed. The adjusting elements can be made in the form of precision lead screws [http: //www.tools-vsem.rf/gost_7805-70. Date of treatment: 15.10.2020]. Elastic elements can be made in the form of springs [http://prughin.ru/index/gost_9389_75/0-132. Date of treatment: 15.10.2020]. The flange can be made in the form of a coupling [Polyakov B.C., Barbash OA, Ryakhovsky OA. Coupling Handbook, p. 142].

During the operation of the device, the flange engages with the coupling half and the holding mechanism, then the coupling half and the flange are lifted along the precision lead screws to a certain vertical position. Counter springs, installed between the flange and precision lead screws, eject the engagement of the flange and half of the coupling beyond the end surface of the screw. In this case, the movement of the power nut is blocked, and then the longitudinal movement of the mechanism for converting the rotational movement into the longitudinal one is unlocked. Thus, an increased stroke length of the device is achieved, and jamming of the screw pair (screw and power nut) is excluded, therefore, high reliability of the entire electrical mechanism as a whole is ensured.

This achieves the technical result specified in the invention.

The figure shows a general structural diagram of the proposed linear actuator electromechanism in the above versions of the implementation of the main elements, such as: a mechanism for converting rotational motion into translational motion and a holding mechanism.

The figure shows: 1 - housing, 2 - a mechanism for converting electrical energy into mechanical energy, 3 and 4 - pulleys, 5 - drive belt, 6 - protective tube, 7 - screw, 8 - tip, 9 - bearings, 10 - mechanical locking device bearing clamp nuts, 11 - bushing, 12 - inductive limit switches, 13 - drive belt tension control device, 14 - lubricant supply device, 15 - bearing clamp nut, 16 - stops, 17 - fastening elements, 18 - mechanism for converting rotary motion into translational, 19 - screw-nut, 20 - keyed connection, 21 - screw connection, 22 - power nut, 23 - half-coupling, 24 - holding mechanism, 25 - separator, 26 - retaining ring, 27 - flange, 28 - adjusting elements, 29 - elastic elements, 30 - internal spline groove.

The purpose of the introduced elements is as follows.

The mechanism for converting rotary motion into translational motion 18 is designed to transmit torque to the power nut 22 with minimal loss of motion. In addition, the mechanism for converting rotary motion into translational motion 18 is designed to reduce the incoming loads on the power nut 22 during its linear reciprocating motion.

The internal spline groove 30, made in the inner surface of the power nut 22, is designed to move along the screw 7 and the power nut 22 of the coupling half 23, which is designed to prevent idle rotation of the power nut 22.

The flange 27 and the adjusting elements 28, between which the elastic elements 29 are installed, together with the half-coupling 23 are designed to prevent the power nut 22 from idling during the operation of the device, as well as to block the movement of the power nut 22 at the moment of reaching its maximum movement and unblocking the longitudinal movement mechanism for converting rotary motion into translational 18.

In this case, the adjusting elements 28 and elastic elements 29 are intended for mutual lifting of the flange 27 and the half-coupling 23. The elastic elements 29 eject them beyond the end surface of the screw 7. This ensures an increase in the stroke length of the linear actuator and the elimination of jamming of its running gear (screw 7 and power nut 22), which significantly increases the reliability of the device as a whole.

The holding mechanism 24, which can be made in the form of a retaining ring 26 and a separator 25, is designed to keep the flange 27 from turning and rotating during its operation.

Linear actuator electromechanism works as follows.

Rotation from the mechanism for converting electrical energy into mechanical 2, which is fixed in the housing 1 by means of fastening elements 17, is transmitted through the pulleys 3 and 4 by the drive belt 5 to the screw 7.

The screw 7 transfers the movement to the mechanism for converting rotational motion into translational 18, which is in engagement with the power nut 22. Since the power nut 22, together with the protective pipe 6 and the tip 8, are fixed against rotation by the screw 21 and keyed connections 20, the power nut 22 and the protective the pipe 6 is reciprocated, moving the tip 8 connected to the working body (not shown in the figure). In this case, the stops 16 installed on the ends of the screw 7 soften the impacts of the power nut 22 without damaging the device. Axial and part of the radial forces through the bearings 9 are perceived by the sleeve 11, while this force does not apply to other parts of the running gear of the electromechanical mechanism.

Improving the reliability of the device is achieved as follows.

When the electrical mechanism is operated along the internal spline groove 30, which is made inside the power nut 22, along the screw 7, the half-coupling 23 makes rotational and linear movements, while preventing the power nut 22 from turning. When a certain vertical position is reached, the half-coupling 23 engages with the flange 27 , which is fixed on the end part of the mechanism for converting rotational motion into translational movement 18 with the help of a retaining ring 26 and a separator 25. Further, there is a mutual lifting of the half-coupling 23 and the flange 27 along the adjusting elements 28, and the retaining ring 26 and the separator 25 keep the flange 27 from turning and rotating ... In this case, the elastic elements 29 are compressed, and at a certain moment, due to the compression force, the half-coupling 23 and the flange 27 are ejected outside the chassis of the electromechanical mechanism - the movement of the power nut 22 is blocked and the longitudinal movement of the screw-nut 19 is unlocked, that is, the screw pair of screw 7 is switched and a power nut 22 for a screw pair of screw 7 and a screw-nut 19. In this case, the stroke length of the tip 8 will increase in proportion to the length of the screw-nut 19.

The reverse motion of the linear actuator is similar to the processes of its operation, but the sequence of actions is reversed.

It is also worth noting the following aspects of the operation of the electromechanism: regulation of the tension of the drive belt 5, as well as its tightening during operation, is due to the device for adjusting the tension of the drive belt 13, which is located on the housing 1;

replenishment of the lubricant during operation occurs due to the lubricant supply device 14 located on the tip 8;

additional tightening of bearings 9 takes place using the bearing clamping nut 15, which is interconnected with the mechanical locking device 10;

to regulate the stroke of the power nut 22, inductive limit switches 12 are used, fixed on the protective tube 6.

These aspects are fully implemented in the prototype and only complement the achieved technical result of the proposed invention.

Claims (1)

Linear actuator electromechanism containing a housing on which a mechanism for converting electrical energy into mechanical energy is installed with a drive belt and pulleys connected to a screw with stops on bearings, a power nut and a bearing clamping nut with a sleeve are installed on top of the screw, a tip is installed on the end part of the power nut, a protective tube is installed over the power nut, on which inductive end switches are fixed, with an additional device for adjusting the tension of the drive belt fixed to the body, a lubricant supply device fixed on the tip, and a device for mechanical locking of the bearing clamp nut, characterized in that the power nut made with an internal spline groove, inside which a coupling half is installed, while the nut is installed between the tip and the protective tube, also between the nut and the screw, a mechanism for converting rotational motion into translational is installed, and on the end part of the wines A holding mechanism is installed on top of which, on the end part of the mechanism for converting rotational motion into translational movement, a flange and adjusting elements are installed, while elastic elements are installed between the flange and adjusting elements.

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