RU212953U1 - Undercarriage of a tracked vehicle with increased payload - Google Patents

Abstract

The proposed utility model relates to the field of transport engineering, and specifically to tracked vehicles, and can be used to create heavy-duty tracked conveyors up to 30 tons with a chassis consisting of six or more road wheels. The undercarriage of the caterpillar vehicle of increased carrying capacity contains rubber-coated track rollers mounted on the sides of the hull on the balancers of torsion suspensions directed in the direction of travel, driving and guiding wheels and a caterpillar with rubber-metal hinges. What is new is that the balancer of the first suspension is connected to the body by means of a rod made in the form of a hydraulic cylinder installed with the possibility of blocking it by a signal from the control system, containing the control unit, the driver's brake pedal movement sensor and the body angular velocity sensor. It is possible to place the drive wheel both in the front part of the caterpillar bypass and in its rear part. The technical result achieved by the utility model is to ensure the necessary stability of the caterpillar in the bypass. 2 w.p. f-ly, 4 ill.

Description

The proposed utility model relates to the field of transport engineering, and specifically to tracked vehicles, and can be used to create heavy-duty tracked conveyors up to 30 tons with a chassis consisting of six or more road wheels.

The well-developed undercarriage of the Russian T-80U tank with a mass of 46 tons is known, which has the best mobility among modern tanks (see the book “Modern Tanks” edited by B.S. Safronov and V.I. Murakhovsky. M. Arsenal-Press, 1995 g p. 129), containing six rubber-coated rollers on board, balancers, 350 mm long, located in the direction of travel, a caterpillar with a parallel RMSh and drive wheels located at the rear.

The operating experience of the T-80U has shown that under typical conditions, stable operation of the caterpillar mover is ensured in relation to the caterpillar coming off. However, when the tank moves downhill with irregularities at an angle or when driving at high speeds and sudden braking, the vehicle hull “pecks” with the front part down and the rear part up. In this case, the caterpillar may come off due to the appearance of slack in the caterpillar bypass. In this situation, when “dive”, there is a sharp movement of the front track roller to the body and the weakening of the tension of the front caterpillar branch. The rear track roller is unloaded and, due to the elastic forces of the torsion bar, moves closer to the exhibition position. The result of the movements of the front and rear road wheels is a reduction in the reference length of the caterpillar bypass and, accordingly, an increase in the free length of the caterpillar bypass, leading to a decrease in tension and loss of stability of the caterpillar in the bypass.

This process is especially relevant for undercarriages with long balancers (LB ≥ 350 mm), having 6 or more road wheels, soft suspension and a caterpillar with RMSH.

The undercarriage of a tracked vehicle with increased payload (RU, utility model according to patent No. 24827, В62D55/08, 2002), made using elements of the undercarriage of modern tanks, was chosen as a prototype. The number of road wheels reaches seven on board. Rollers of large diameter 750 mm, rubber-coated, double.

This chassis contains, depending on the carrying capacity, from 5 to 8 road wheels on each side, which are attached to the torsion bars through balancers. The balancer of the last roller is directed in the opposite direction, and the remaining balancers are directed in the direction of the machine. Torsion bars are an elastic element of the suspension, they are made with a diameter of 47-53 mm, a working length of 1971-2172 mm and are placed over the entire width of the machine body and at a vertical distance from the axis of the drive wheel equal to 215-225 mm for the first suspension and equal to 125-212 mm for the last suspension, the rest of the suspension at a distance of 220-230 mm from the axis of the drive wheel.

Through the use of elements of the chassis of a modern tank, for example, the T-90 tank, it is possible to increase the carrying capacity of the vehicle.

However, this utility model cannot be used for the undercarriage of tracked vehicles that have a common direction for all balancers in the direction of travel, since with this position of the balancers there is no effect of compensation and additional tension of the caterpillar due to the difference in the strokes of the first and last road wheels during the “peck” cars.

The technical result achieved by the utility model is to ensure the necessary stability of the caterpillar in the bypass.

The technical result is achieved by the fact that in the undercarriage of a tracked vehicle with increased payload capacity, containing rubber-coated track rollers mounted on the sides of the hull on the balancers of torsion suspensions directed in the direction of travel, driving and guiding wheels and a caterpillar with rubber-metal hinges, according to the utility model, the balancer of the first suspension connected to the body by means of a rod made in the form of a hydraulic cylinder installed with the possibility of its blocking by a signal from the control system, containing the control unit, the driver's brake pedal movement sensor and the body angular velocity sensor.

Analysis of the main distinguishing features showed that:

- the introduction of additional thrust, made in the form of a hydraulic cylinder, capable of being blocked by a signal from the driver's brake pedal sensor and a signal from the angular velocity sensor of the control system housing, made it possible to exclude the movement of the first roller and the corresponding angular movement of the housing, that is, to block the “peck” of the housing , eliminate the reduction of the reference length of the caterpillar bypass and maintain the stability of the caterpillar in the bypass.

The essence of the utility model is illustrated by drawings, where it is shown on:

- fig. 1 - side view of the undercarriage of a tracked vehicle with increased payload;

- fig. 2 - scheme of operation of the device for blocking the hydraulic cylinder of thrust before the "peck";

- fig. 3 - scheme of operation of the device for blocking the hydraulic cylinder of thrust during "pecking";

- fig. 4 – hydraulic cylinder blocking control scheme.

The undercarriage of the caterpillar machine with increased payload (figure 1) contains a drive wheel 1, torsion bars 2, balancers 3 connecting road wheels 4 with torsion bars 2, caterpillar 5 with rubber-metal hinges, supporting rollers 6, steering wheel 7 and thrust in the form of a hydraulic cylinder 8, connecting the balance point of the first track roller with the hull point. The blocking device of the hydraulic cylinder 8 (Fig. 2 and Fig. 3) contains an electro-hydraulic valve 10 for blocking the cavities of the hydraulic cylinder 8, an electromagnet 11 that controls the electro-hydraulic valve 10 and an electrical connector 12 that receives the signal of the circuit (Fig. 4) for controlling the blocking of the hydraulic cylinder 8. The blocking control system The hydraulic cylinder 8 (Fig. 4) contains a displacement sensor 13 (DP) connected to the brake pedal of the driver of the machine, a sensor 14 of the angular velocity of the machine body (DUK), a control unit 15 (CU) and a connector 12 for electrical connection of the hydraulic cylinder blocking control system eight.

During the operation of the undercarriage of the caterpillar machine with increased payload, the torque from the engine supplied to the drive wheel 1 is converted into a tractive effort, which ensures the realization of the traction and braking forces by the caterpillar due to the forces of adhesion to the ground.

The mass of the machine sprung on the torsion bars 2 with the center of mass 9 is transferred to the ground through the balancers 3, the track rollers 4 and the caterpillar 5, while an elastic connection of the body with the track rollers 4 is formed to mitigate the shocks and shocks that occur when driving over uneven terrain. Since one end of the torsion bar 2 is fixedly fixed in the machine body, and the other - in the balancer 3, then when the track roller 4 hits an unevenness and the balancer 3 turns, the torsion bar 2 twists and softens the shocks and shocks perceived by the machine.

When the machine moves downhill, as well as during sudden braking, the thrust in the form of a hydraulic cylinder 8 is blocked, while the balancer 3 does not move the roller to the body and there is no angular rotation of the “peck” body relative to the center of mass. Since there is no "peck" of the hull, there is no reduction in the reference length of the caterpillar bypass and a corresponding increase in the free length of the caterpillar bypass, leading to a decrease in tension and loss of stability of the caterpillar in the bypass.

This phenomenon contributes to the stability of the caterpillar on the bypass.

The thrust hydraulic cylinder 8 is blocked by an electro-hydraulic valve 10 using an electromagnet 11 at the command of the control unit 15, electrically connected to the displacement sensor 13 connected to the driver's brake pedal and the housing angular velocity sensor 14 (see Fig. 2, 3 and 4). In case of sudden braking, that is, a sharp movement of the driver’s pedal, the displacement sensor 13 is triggered and gives a signal to block the hydraulic cylinder 8. When the angular movement of the body, “pecking” of the body, the angular velocity sensor 14 also gives a signal to block the hydraulic cylinder 8. Control unit 15 determines the presence of two signals and issues a command to the electromagnet 11 of the electro-hydraulic valve 10, which closes the inlet and outlet cavities of the hydraulic cylinder 8 and puts them on the hydraulic lock. When the driver's pedal is released, the displacement sensor 13 and the angular velocity sensor 14 issue a command to unlock and the hydraulic cylinder 8 goes into a free state, in which there is no rigid connection between the front roller and the machine body.

Thus, the proposed undercarriage makes it possible to use it as part of heavy tracked vehicles up to 60 tons with a load capacity of up to 30 tons, while ensuring the necessary stability of the track in the bypass.

Claims (3)

1. The undercarriage of a tracked vehicle with increased payload capacity, containing rubber-coated track rollers mounted on the sides of the hull on the balancers of torsion bar suspensions directed in the direction of travel, driving and guiding wheels and a caterpillar with rubber-metal hinges, characterized in that the balancer of the first suspension is connected to the hull by means of a rod , made in the form of a hydraulic cylinder, installed with the possibility of its blocking by a signal from the control system, containing the control unit, the driver's brake pedal displacement sensor and the housing angular velocity sensor. 2. Chassis according to claim 1, characterized in that the drive wheels are located in front of the caterpillar bypass. 3. Chassis according to claim 1, characterized in that the drive wheels are located in the aft part of the caterpillar bypass.

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