SU586019A2 - Windscreen wiper drive - Google Patents

Description

(54) DRIVE OF THE WIPER

one

This invention relates to a device for cleaning windshields of vehicles.

Basically auth. St. No. 287528 describes the drive of the wiper blades containing an air motor, in the working cylinder of which a double-sided piston is fitted, equipped with a toothed rack engaged with the brush irides sector, a knob-regulating device connected by channels to the working cylinder of the pneumatic motor spool valve, the axis of the spool is parallel to the axis of the working cylinder . The spool valve is integrated into one of the end caps of the air motor housing. The case of the air motor is made with longitudinal channels connected to the working cylinder by radial channels, and with the spool valve - inclined channels.

The camera spool valve in front of the butt of the spool is connected to the locking and adjusting device.

Additional channels are made in the motor case.

When the brushes are placed in the narkovole, the two-sided porridge, due to the large size chain, has the ability to move significantly beyond the bypass holes, turning the toothed sector and

axle air motor for additional angle; which leads, especially with a small width of the windshield, to the creep of the brushes on the cab seals and to the wiper

from build. When the direction of movement of the two-sided pipe is changed, a portion of compressed air enters the cavity, free from overpressure, through the bypass openings, which, creating backpressure, significantly reduces the torque. In the presence of a large force of traction of brushes on glass, this leads to the stop of the motor. The aim of the invention is to prevent the wiper blades from falling on the glass sealer when laying the brushes in the park position.

To do this, protrusions are made on the inner surface of the air motor housing to limit the displacement of the piston.

The drawing shows the proposed device.

A two-sided piston in the form of a rail 2 is placed into the working cylinder of the air motor housing 1, to which flanges 3 and 4 are attached. On the one hand, a cover 5 is attached to the body end, and a cover 6 on the other. To eliminate compressed air leaks from the working cavities Cases 1 are provided with seals of elastic materials. The lid 6 is a spool valve, the casing of which is made by casting a cavity of a complex profile under pressure, channels providing compressed air bypass in a certain direction, and a channel in which the valve 7 moves. Rubber sealing rings are installed in the grooves of the valve 7. The rail 2 is fixed with sector 8, through which it transmits the oscillatory motion to the axis 9 of the lever 9 attached to sector 8.

Pipelines from the network are connected to the air motor through a control valve to supply compressed air to the drive; from the air motor to the control valve for exhaust air (if necessary); from the control cock to supply a pulse of compressed air when laying the brushes in the park position.

Compressed air from the control valve through the opening 10 enters (at the position of the spool 7 indicated in the drawing) through the channels 11, 12, 13 into the cavity A of the housing, moving the rail 2 to the left. The exhaust air from the cavity B of the housing through the opening 14, the channels 15,16 and the opening 17 enters the cavity S of the housing and through the silencer enters the atmosphere directly or through the pipeline through the control valve. The movement of the rail 2 to the left occurs until the moment when the two-sided piston with the flange 4 rests against the lip of the housing. In this case, the ring 18 will go beyond the hole 19. The compressed air from the cavity A, the passage through the hole 19, the channel 20 and the channel 21, moves the valve 7 all the way to the end cap 22.

Now the compressed air from the pipeline from the network enters through the holes 10 and 14 into the cavity B and moves the rail 2 to the right until the flange 3 stops against the protrusion D. The exhaust air from the cavity L through the channels 13, 12, 11, 21, 20 and the hole 19 falls into cavity B and further above in the way goes into the atmosphere. At the end of the movement of the rail 2 to the right, the ring 23 passes over the opening 17. Compressed air from the cavity B through the opening 17 through the channel 16 enters the canal 15, moves the valve 7 all the way to the bottom of the cylinder under the valve and the cycles repeat.

The placement of the brushes in the park position is as follows.

The air from the control valve through the pipeline through the hole 24 enters the cylinder under the valve 7 and moves the valve 7 to

stop it in the cap 22. The compressed air enters the cavity A, moving the rail 2 to the left. When the ring 18 passes through the hole 19, the switching of the spool will not occur, since the air from the cavity A through the hole 19,

the channels 20 and 21 also tend to move the spool 7 up to the stop in the cap 22. The brushes are set to the park position.

To maintain a constant torque in housing 1, unloading calibrated holes 25 and 26 are made through

which are compressible air from the cavities L and

B at the moment of the start of the piston to the left

or to the right, it passes into cavity B.

To increase the manufacturability of the product

the axis of the spool 7 is perpendicular to the axis of the working cylinder of the housing 1, which made it possible to replace the inclined channels with openings of small length. To be able to use the proposed design of an air motor for other modifications requiring a different magnitude of the swing angle I1, current, it suffices to replace the rail 2 with a rail of greater or less length.

Claims (1)

Invention Formula Drive wiper blades on auth. St. No. 287528, characterized in that, with in order to prevent the wiper blades from falling on the glass seal when laying the brushes in the park position, protrusions are made on the inner surface of the air motor housing to limit the movement of the piston. X4NV X / Hr x X 7 / // /// 7 0 12 72 IS18