SU1362994A1 - Loading device of screw-nut transmission - Google Patents

Abstract

The invention relates to mechanical engineering, in particular to testing equipment, and can be used in test benches for carrying out experimental studies of screw - nut gears in laboratory and working conditions. The aim of the invention is to expand the technological capabilities of the loader by providing a change in the axial load required by the law applied to the test gears. Changing the axial force during the test is provided by turning on the drive 25, which rotates the non-circular profile running shaft 26 and the gear that is engaged with the central gear 22. At the same time, the bolts 15, which engage with the central gear 22, with their gear heads, are rotated relative to st. strutting the nuts 17 with the faceplate 17, and tightening the springs 18 increases or decreases depending on the direction of rotation of the drive 25. 3 sludge. (L with: 25 /

Description

The invention relates to mechanical engineering, in particular to testing equipment, and can be used in test benches for carrying out experimental studies of screw - nut gears in laboratory and working conditions.

The purpose of the invention is to expand the tehtically connected with a parallel guide shaft 26 of a non-circular profile (e.g. square section), constant along the entire length, on which the c. the possibility of displacement 1 along it is gear 23. An installation with a heating gear for testing gears of a screw-nut of the work-logical capabilities of a Q loading device is as follows.

by making a change in the required rotation of the rotor of an electric motor

obeys the law of axial load applied to the test gears.

FIG. 1 shows an installation with a loader for testing gears of a screw-nut, a general view of FIG. 2 is a view along arrow A in FIG. 1; figure 3 - section bb in fig. one,

An installation with a loader for testing gears with a screw - nut contains a frame 1 with a guide (not indicated), an electric motor 2, the casing of which is placed in the opening of the frame 1 with the possibility of rotation relative to

However, spring 3 connecting the housing 25 through electrical communication with the electric motor 2 to the base 1, the gear 4, the tachometer sensor 5 connected to the rotor of the electric motor 2, and the rear center melts 6. The test-screw-nut transfers consist of screw 7 connected to the low-speed shaft 8 of the gearbox 4 and to the rear center 6, and two nuts 9 and 10 placed in coaxial mandrels 11 and 12, fixed against bias. 13 n from the mutual rotation of the pin 14. in the form of gears, they are connected with nuts 16, frames 11 and 12 and faceplate 17. Between The last and mandrel 12 on each of the bolts 15 has an elastic element, for example a spring 18. On the mandrel 11 there is a leash 19 located in the guide frame 1, and nuts 16 are fixed on the faceplate 17. On the base 1 two microswitches 20 are placed electrically connected with the electric motor 2 and oriented with their buttons respectively to the mandrel 11 and the faceplate 17. The heads of the bolts 15 with their teeth engage with the central gear wheel 22, based on the cylindrical surface of the test nut 9 and engaged M with a gear 23 mounted rotatably in a bearing 24 housed in a mandrel 11. A drive 25 is fixed on the base 1, which is kinematically connected to a parallel guide roller 26 of a non-circular profile (e.g. square section) constant along its entire length, which is installed with. the ability to move 1 along it gear 23. Installation with a heating rake for testing gears screw - nut work

2 through a gearbox 4 is transmitted to its low-speed shaft 8 connected with a screw — 7 test gears — a nut — The test nuts 9 and 10 move at the same speed along the screw 7, since the leash 19 entering the guideway prevents the rotation of the gear 7 and connected with a mandrel 11 held from rotation relative to the mandrel by 12 pins 14. As the nuts 9 and 10 move to the right (according to the drawing). At the end of the stroke, the mandrel 12 presses the microswitch button 20, which

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using the motor 2 reverses it, after which the nuts 9 and 10 start moving in the opposite direction (to the left in the drawing) until the microswitch 21 operates. This leads to another change in the direction of movement of the nuts 9 and 10 and the mandrel 12 against the button of the microswitch 20. Then the cycle is repeated is.

The change in the process of testing the axial force acting on the test transmissions, formed by nuts 9 and 10 and screw 7, is achieved by turning on the drive 25, which rotates the drive shaft 26, which interacts with gear 23, the hook ™. With the central gear 22, the bolts 15, which engage with the gear 22 with their gear heads, turn relative to the nuts 16 connected to the faceplate 17, as a result of which the spring 18 is tightened or reduced (depending on the direction drive rotation 23) ..

The control of the friction torque in gears is carried out by the magnitude of the deformation of the spring 3, which depends on the magnitude of the torque on the low-speed 5zal 8 of the gearbox 4,

The axial force in the gears is determined by the position of the nuts 16 relative to the bolts 15 and is controlled by the amount of draft of the springs 18.

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five

The control of the rotational speed of the rotor of the electric motor 2, and consequently of the screw 7, is carried out using a tachometer sensor 5.

The wear is monitored by changing the distance between the mandrels 11 and 12 and by reducing the tightening of the springs 18.

Since the elastic deformations of the springs 3 and 18 can be converted into electrical signals using, for example, resistance strain gauges, and the sensor signal 5

As a rule, the tachometer is an elastic washer element, which is of a tactical nature, it can be recorded with the usual recording equipment.

Thus, in the process of testing the screw-nut gears, the main parameters affecting the transmission performance indicators can be changed according to any law, namely speed and axial force.

In addition, it is possible to compensate for the loss of axial force due to the wear of parts of the subjects.

gears, turning on the drive 25 of the auto-gear wheel and the driver, is set automatically by a signal from the sensor, mounted on one of the mandrels and connected with spring 3 and electrically.

did

ki associated with the drive 25. The installation can be carried out in automatic mode.

f

rmula of invention

The screw for nut gear testing contains a guide frame, two coaxial mandrels for placing two nuts of the tested gears, a faceplate, bolts with nuts and the bolts between the mandrels and the plan and last that, in order to expand technological capabilities, the heads of the bolts are made in the form of gears, the loader is equipped with a drive fixed on the frame, kinematically connected with it and located parallel to the guide shaft Glogow profile, the pinion mounted on a -Update

the possibility of axial movement in another mandrel with the possibility of rotation, which is located coaxially with the latter and which engages with the gear and teeth of the heads of the bolts

I, 12

bb

fe.3

Claims (1)

Claim Loader for testing gears screw - nut, containing a bed with a guide, designed to accommodate two nuts of the tested gears, coaxial mandrels, faceplate, ₀ bolts with nuts connecting the last to mandrels and elastic elements placed on bolts between one of the mandrels and faceplate, characterized in that , in order to expand technological capabilities, the bolt heads are made in the form of gears, the loader is equipped with a drive fixed to the bed, kinematically connected with it and located parallel to the direction a non-circular profile running shaft, a gear mounted on the latter with the possibility of axial movement and in another mandrel with the possibility of rotation, placed coaxially with the latter and engaged with the gear and teeth of the bolt heads by a central gear wheel and a leash mounted on one of the mandrels and in the guide , 5-5 Fig.Z