SU1418171A1 - Arrangement for automatic tensioning of endless track and relieving of tensioning wheel of vehicle - Google Patents

Abstract

The invention relates to a transport machinery industry, namely to hydraulic devices for tensioning track chains. The purpose of the invention is to simplify the design, reduce the size and reduce the metal consumption. The device contains a hydraulic cylinder 1, the piston 2 of which is made with a longitudinal cavity 3 in which the rod 5 is movably mounted, communicating through the fork 9 with the tension wheel 8. The pressurized fluid enters the piston cavity of the hydraulic cylinder 1 and through the non-return valve 4 moves the rod 5 , pushing it out gradually as the track wears out. 2 Il.

Description

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The invention relates to a transport machinery industry, namely to hydraulic devices for tensioning track circuits, in particular construction machinery.

The purpose of the invention is to simplify the design, reduce the size and reduce the metal consumption.

FIG. Figure 1 shows the device for automatically tensioning the track and giving up the tension wheel of a vehicle; fig. 2 - the same, option of execution.

The device comprises a hydraulic cylinder 1 rigidly fixed on the vehicle frame, the piston 2 of which is made with a longitudinal cavity 3 connected to the piston cavity of the hydraulic cylinder through a spring-loaded non-return valve 4. In the longitudinal cavity 3 of the piston 2 the rod 5 is movably mounted, fixed stopper 6 for engagement with an anvil 7 fixedly mounted on the frame of the vehicle. The tension wheel 8 with the help of a fork 9 fixed on its axis interacts with the rod 5. The cavity 3, made in the piston 2, communicates through the check valve 4 with the portrill cavity of the hydraulic cylinder, which in turn is connected to the pressure line of the hydraulic drive stroke channels 10, and from the drain through an adjustable high pressure valve 11.

The device works as follows.

When the hydraulic actuator is turned on, the pressurized fluid enters the piston cavity of the hydraulic cylinder through the corresponding check valve, depending on the direction of rotation of the hydraulic valves. The piston 2 moves outward until the contact of the stopper 6 with the support 7. At the same time, the rod 5 moves the tension wheel 8 through the fork 9, providing tension on the track. If the pressure in the piston cavity of the hydraulic cylinder 1 is increased to a value that exceeds the setting of the valve 11 (if foreign objects get into the crawler rim), this valve opens and excess liquid goes to the drain. The tension wheel 8 presses through the plug 9 on the rod 5 and the piston 2, which moves in the opposite direction, provides for the delivery of the gooseneck.

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If the track is pulled out as a result of the wear of the connecting links of the links, then in the outermost position of the piston, when the stopper 6 contacts the stop 7, the check valve 4 opens, overcoming the force of its spring. Under the action of pressure in the piston cavity 1a, the liquid enters the longitudinal cavity 3 of the piston 2 and the rod 5 begins to extend relative to the piston 2, gradually moving the tension wheel for a distance compensating for the slack of the track. The return of the stem inwards is prevented by a check valve 4, which cuts off the discharge of fluid from the bore 3 into the piston cavity of the hydraulic cylinder.

A certain amount of slack track for the entire period. The service life of the machine is determined by selecting the appropriate diameter of the rod 5.

The force of the spring of the check valve 4 prevents the advancing action of the rod 5, as a result of which the actuator 2 may not reach the stop 7, which may lead to the transfer of the caterpillar.

As a fixed stop (Fig. 2), a hydraulic cylinder cylinder may be used, and an annular protrusion of the piston as a movable stopper.

Claims (1)

Formula of Invention A device for automatically tensioning the caterpillar belt and handing over the vehicle's tension wheel, containing a hydraulic cylinder rigidly mounted on the vehicle frame, the piston of which is mounted for limited movement and is made with a cavity communicated by means of a check valve with a pressure line and movably mounted piston cavity with the ability to interact with the tension wheel rod, characterized in that, in order to simplify the design, reduce the size and reduce the metal consumption STI, the piston chamber of the hydraulic cylinder communicates with a pressure line and via said check valve - with said cavity formed in the piston.