SU1211134A1 - Device for tightening vehicle endless track - Google Patents

Description

FIELD OF THE INVENTION The invention relates to a transport engineering, in particular to tracked vehicles.

The purpose of the invention is to increase the reliability of the device for tensioning a track chain.

FIG. 1 schematically shows the device and its placement on the vehicle, general view; in fig. 2 shows a hydraulic cylinder of a device with valves and a pressure regulator, a slit.

The device for tensioning the vehicle track chain contains a damping element in the form of a spring 1, a hydraulic cylinder 2, which is hinged on the frame 3 of the vehicle. Stem 4 of the cylinder 2 is pivotally connected to the tension wheel 5, and the working cavity 6 is connected, on the one hand, to the hydraulic hydraulic line (not shown) of the vehicle via a constant pressure valve 7, and to the other side, to a drain line (not shown) hydraulic system through the pressure regulator 8. The regulator 8 is made in the form of two cylinders 9 and 10 installed on the same axis (in series) with pistons 1 1 and 12 located in them and return springs

13 and 14. In the piston 12, a plunger valve 15 is placed, the cavity of which is connected by channels 16 to the working cavity 6 of the hydraulic cylinder.

To adjust the tension of the spring

14 in the cylinder 10 a nut 17 is inserted. In the case of the cylinder 9 a channel 18 is made, which is communicated by means of the cylinder 9 by communicating openings in the form of nozzles 19 and an opening 20.

The device works as follows.

During the initial tension of the track, the oil from the main hydraulic system of the vehicle through the valve 7 of constant pressure enters the working cavity of the hydraulic cylinder 2 until the required preload tension is established, after which the valve 7 closes.

When the hinges are worn in the working cavity 6, the pressure decreases. The valve 7 is opened and the pressure in the cavity 6 is restored by the addition of an additional portion of oil. The valve 7 is then closed again. These processes will be repeated until the track chain joints are worn to the maximum.

When the vehicle is maneuvered (when turning) and when a foreign object hits the track circuit in cavity 6, the pressure increases dramatically. This opens the plunger valve 15, the piston 12 moves back, a portion of the fluid through the channel 16 from the working cavity 6 of the hydraulic cylinder 2 enters the cylinders 10 and 9. The piston II abruptly moves back, opening the nozzle 19, through which the liquid enters the channel 18, closing the hole 20.

Thus, the oil is locked in the controller 8, therefore, in the cavity 6 of the hydraulic cylinder 2, which ensures a stable interaction of the track chain with the drive wheel and other elements of the vehicle's undercarriage.

With the disappearance of the cause of the increased loads in the track chain,

 in the cavity 6 of the hydraulic cylinder 2 falls, the plunger 15 moves back, the pistons 1 and 12 under the action of the springs 13 and 14 come to the initial position. When this piston 11 closes the nozzle 19 and opens the hole 20, i.e. cavity 18

shchas with the drain channel.

In certain modes of operation of the caterpillar drive, when the force on the rod 4 of the hydraulic cylinder 2 decreases, the pressure in cavity 6 decreases, and then the initially set pressure is restored. The excess fluid from the cavity 6 of the cylinder 2 is removed as follows. The plunger valve 15 is opened, in the cylinder 9, the piston 11 moves back, opening the jet 19 inlet. In this case, the cylinder 9 communicates with the drain

through the jet 19, the channel 18 and the hole 20, because in this mode the piston occupies a position between the jet 19 and the hole 20. This is due to the pressure value in cavity 6, which

less pressure when maneuvering the tractor, especially during critical conditions.

After reaching the pressure value initially set in cavity 6, the plunger valve 15 closes.

The proposed device maintains a constant value of the initially set pressure in the working cavity of the hydraulic cylinder and a stable value of the pretension of the track chain.

sixteen

Editor M. Tovtin Order 595/23

VNIIPI USSR State Committee

for inventions and discoveries

113035, Moscow, Zh-35, Raushsk nab. 4/5

Branch PPP "Patent, Uzhgorod, st. Project, 4

Compiled by V. Lysunets

Tehred I. VeresKorrektor M. Samborska

Circulation 572Subscribe

Claims (1)

DEVICE FOR TENSIONING A VEHICLE CRAWLER CHAIN, comprising a tension wheel, a shock absorber and a hydraulic cylinder pivotally mounted on the vehicle frame, the rod of which is pivotally connected to the tension wheel and the working cavity is connected on one side to the pressure line of the vehicle hydraulic system via a constant pressure valve on the other hand, with the drain pipe of the hydraulic system through a pressure regulator, characterized in that, in order to increase reliability, the pressure regulator is made in the form of two sequentially installed cylinders with spring-loaded pistons located in them, in one there is a plunger valve, the cavity of which is connected by a channel to the working cavity of the hydraulic cylinder, and in the other there are communicating openings, which are blocked alternately by the piston of this cylinder during its movement and connecting the piston and after piston cavity.