SU508792A1 - Device for demonstrating the transmission of rotational motion - Google Patents

Description

one

The invention relates to gears.

A device for demonstrating the transmission of rotational motion is known, comprising an irivod, a gear mechanism and a recording device with an arrow. The gearing mechanism is provided with measurable and measuring wheels located on two coaxial center pins x. These wheels are engaged in a single-hook gear with the third intermediate wheel. The arrow is connected to the wheels by means of a lever transmission. The device is designed to measure the kinematic error of gear wheels.

The disadvantage of the device is its inability to use it to evaluate the effectiveness of backlash pickers.

The purpose of the invention is also to demonstrate the operation of backlash-pickers.

This is achieved by the fact that the device is equipped with a loading mechanism, the gear mechanism is made in the form of a conical differential and two identical experimental wheels with gearing that engage, the carrier is connected to an arrow, and each of the central wheels of the differential is connected by identical kinematic chains one of the experimental wheels, the first of which is connected to the drive, and the second to the loading mechanism.

The drawing shows the proposed device.

It contains a drive including a handwheel 1, a self-braking worm gear with a Worm 2 worm and a worm gear 3. The latter is associated with an experimental split wheel 4 and a wheel 5. Experimental wheel 4 is engaged with the second experimental wheel 6. Both of these wheels are equipped with backlash pickers, for example, in the form of springs 7. With wheel 6, a mechanism 8 with an adjusting screw 9 and a wheel 10 are kinematically connected. Scenes are centrally mounted with wheels 11 and 12 of a conical differential 13. On the driver differential wheel ala 13 zakreileno wheel 14 which is engaged with gear 15, carries the arrow 16 schkaly 17 of the recording device.

The device works as follows.

When the handwheel 1 is turned at any angle, the movement is transmitted to the worm to 2 and to the worm gear 3 of the self-braking transmission. Together with the worm gear 3, wheels 4 and 5 turn. Wheel 6 is linked to wheel 4. The number of teeth on wheels 4 and 6 is the same. The moment of resistance on the wheel 6 is created by the loading mechanism 8, and its adjustment is carried out by the screw 9.

Transmission torque entered by

A help of the handwheel 1 is perceived as a self-braking worm gear — a worm wheel 3 and a worm .2.

If the braking torque generated by the loading mechanism 8 does not exceed the torque generated by the spring 7, then the experimental wheels 4 and 6 rotate strictly synchronously, i.e. the rotation angles f4 and fb are equal in magnitude. There is no backlash in the experimental transmission, i.e.

Acr4-6 I "4 I - I in U (P

where AF4-6 - play in the mesh between the experimental wheels 4 and 6.

Wheels 5 and 10, coupled with the central wheels 11 and 12, respectively, turn to the same and opposite angles. Drove the differential 13 and the wheel 14 is rotated - (.ll .I2), (2)

where fn is the angle of rotation of the wheel 14, is the angle of rotation of the wheel 5, f, is the angle of rotation of the wheel 10,

U5, ii - the gear ratio between the wheels 5 and And,

Uio.i2 is the gear ratio between the wheels 10 and 12.

In this case, the condition that U5, ii Uio, i2 is satisfied. If conditions are met (1).

Thus, the wheel 14 remains stationary and the arrow 16 maintains its position on the zero division of the scale 17.

In the event that the braking torque generated by the loading mechanism 8 exceeds the torque developed by the spring 7, the experimental wheels 4 and 6 at this moment lose synchronism in their movement. Their angles of rotation f4 and fb will be different, as the gap in the gearing appears. Expression (1) in this case takes the following form:

A94-6 g - I, I - I e I. , (3)

The angle of rotation of the fnn of the wheel 14 is determined by the expression (2), and moreover. The angle of rotation of the arrow 16 is determined from the expression

1., 15, (4)

where f1b is the angle of rotation of the arrow 16;

Ui4, i5 is the gear ratio of the gear train between the wheels 14 and 15. When the braking torque changes on the driven experimental wheel 6, which is achieved by turning the adjusting screw 9 of the loading device 8, the AF4-6 value changes, and with it the angle of rotation of the arrow 16 . When changing the direction of rotation of the handy wrench I, the direction of the angle of rotation of the wheel 14 and 5 times 16 changes.

The self-braking gear of the worm gear allows the angle input (and torque) handwheel 1 to remain in any position, while the operating modes of the experimental wheels 4 and 6 are not disturbed.

Claims (1)

Invention Formula A device for demonstrating the transmission of rotational motion, comprising a drive, A gear mechanism registering an instrument with an arrow, characterized in that, in order to demonstrate also the play of the backlash selectors, the device is equipped with a loading mechanism, the gear mechanism is made in the form of a conical differential and two identical gear wheels that engage with the backlash pickers; with an arrow, and each of the central wheels of the differential by the same kinematic chains is associated with one of the experimental koj: ec, the first of which is connected to the drive, the second e - and loading mechanism. sixteen YU