RU2403152C1 - Onboard hydrodynamic grill for amphibious tracklaying vehicle - Google Patents

Abstract

FIELD: transport. ^ SUBSTANCE: invention relates to transport machine building. Onboard hydrodynamic grill for amphibious tracklaying vehicle is intended for floating controllability improvement and is mounted near driving wheel. Hydrodynamic grill represents a set of vertical bended blades. To increase efficiency of reverse flow formed by top run the blades are installed in two rows. Top row of blades is located between track and over-crawler shelf. And over-crawler blades by their entrance segments are faced to reverse flow and have a curvature gradually increasing towards driving wheel: where i - serial number of blade (i=3-5); b - over-crawler shelf width; n - number of blades and installed with pitch of ^ EFFECT: increase in amphibious tracklaying vehicle manoeuvrability is achieved. ^ 2 dwg

Description

The invention relates to the field of transport engineering, in particular to floating tracked vehicles and for the development of special hydrodynamic devices to improve handling afloat.

Known airborne hydrodynamic gratings used on serial floating tracked vehicles, for example, MT-LBu light multipurpose tracked chassis or 2C1 universal tracked light chassis (Universal tracked light chassis. Technical description and operating instructions. - M .: Military Publishing, 1976), are intended To improve handling afloat, they are installed in the area of the driving wheels and consist of a set of identical vertical V-shaped blades. The principle of operation of these lattices is based on the interaction of the return flow formed by the upper branch of the caterpillar with the vertical blades of the lattice, resulting in an additional positive reactive force directed away from the side and to the stern, which slightly increases the turning moment when one of the tracks is slowed down. At the same time, the well-known airborne hydrodynamic gratings are not effective enough, since they only partially affect the reverse flows due to their location on the side of the tracks.

Known hydrodynamic lattices mounted on a floating conveyor (USSR copyright certificate No. 1293047, class B60F 3/00, 1987). These grilles are attached to the fenders and consist of blades installed with a constant pitch equal to half the width of the fenders, each of which is curved with a certain radius, related to the width of the fenders and the total number of vanes. In the interaction of the reverse flows formed by the upper branches of the tracks with the blades of the gratings, they separate and sequentially turn, which contributes to the formation of additional positive traction force and an increase in speed, as well as improved controllability (when one of the tracks is slowed down). At the same time, the effectiveness of these lattices is manifested only with a sufficient approximation to the tracks, which increases the likelihood of damage to them when moving on land, entering water and leaving water. In addition, the known design of the gratings does not use a part of the return flow, which extends from the side of the track, which leads to some increase in the negative thrust of the upper branch.

Hydrodynamic lattices mounted on an amphibious vehicle are also known (USSR author's certificate No. 631369, class B60F 3/00; B62D 55/00, 1978) in order to improve handling afloat. These grilles are attached to the sides in the area of the driving wheels and consist of front and side V-shaped blades. In this case, the front vanes of each lattice are located in front of the upper branch of the caterpillar and have inlet sections oriented towards the reverse flow, and the side vanes, respectively, on the side of the caterpillar. Thus, in these gratings there is a more complete use of reverse flows with their rotation away from the side and to the stern, which is also facilitated by the use of shields that impede the downward movement of flows. At the same time, the known gratings have insufficient efficiency due to significant hydraulic resistance, as well as a tendency to clogging with foreign objects.

The aim of the invention is to improve the controllability (agility and stability of movement on a given course) of a floating vehicle with caterpillar navigational propulsion due to increased efficiency in the use of reverse flows formed by the upper branches of the tracks.

This goal is realized by installing side hydrodynamic gratings in the region of the driving wheels, each of which consists of two rows of vertical curved blades, the upper row of blades being located between the caterpillar and the fenders, and the fenders themselves with their inlet sections are oriented towards the reverse flow, have successively increasing in the direction of the drive wheel, the radius of curvature and a constant step.

General view and principle of operation of the onboard hydrodynamic lattice shown in figure 1, where the following notation:

1 - side hydrodynamic lattice;

2 - a driving wheel;

3 - side scapula (scapula of the lower row);

4 - fenestrated shoulder blades (shoulder blades of the upper row);

5 - caterpillar mover;

6 - floating tracked vehicle.

The onboard hydrodynamic grid 1 is installed in the region of the driving wheel 2 and consists of two rows of curved vertical hydrodynamic blades 3 and 4 mounted on a common base.

The upper row of blades in height is located between the drive wheel and the caterpillar shelf and is designed to increase the efficiency of using the main part of the return flow, which extends over the track 5. For this, the caterpillar blades 4 (upper row blades) with their inlet sections are oriented towards the reverse flow, have successively increasing in the direction of the drive wheel radius of curvature

,

,

where i is the serial number of the blade (i = 3-5);

b is the width of the fenders;

n is the number of blades, and installed in increments

,

,

which contributes to the separation and sequential reversal of the fennel stream with minimal hydraulic resistance.

The lower row of blades is located on the side of the upper branch of the caterpillar; by the nature of its interaction with the return flow it does not differ from the well-known serial airborne hydrodynamic lattices and consists of identical vertical V-shaped hydrodynamic blades 3 installed with a constant pitch.

Thus, in the proposed airborne hydrodynamic lattice there is a more complete use of the reverse flow with the formation of reactive force, which contributes to improved controllability.

The location of the side of the hydrodynamic lattice in the area of the drive wheel significantly reduces the likelihood of damage to the vertical movements of the upper branches of the track.

In order to improve manufacturability, all the elements of the onboard hydrodynamic lattice are made of sheet material and connected to the wide use of welding, and the elements of its fastening to the machine body are consistent with the basic design. The upper row of blades can be made folding to reduce the size of the grill in the transport position.

The device operates as follows: when the drive wheel 2 rotates as a result of the interaction of the return flow formed by the upper branch of the track 5 with the vertical blades 3 and 4 of the side hydrodynamic grate 1, its direction of ejection changes to the side from the side with the formation of a reactive force R. With rectilinear movement the reactive forces of the two sides balance each other, which helps to keep the floating machine 6 at a given course due to the reduction of the influence of the difference in the traction forces of the tracks. A decrease in the speed of rewinding of one of the tracks leads to an increase in the turning moment M _pov towards the lagging side.

Claims (1)

An onboard hydrodynamic lattice of a floating tracked vehicle designed to improve handling afloat, installed in the area of the driving wheel and consisting of a set of vertical curved blades, characterized in that, in order to improve the efficiency of using the return flow formed by the upper track branch, the blades are installed in two rows moreover, the upper row of blades is located between the caterpillar and the fenders, and the fenders themselves with their inlet sections are oriented towards the opposite flow, have a gradually increasing radius of curvature in the direction of the drive wheel:

where i is the serial number of the blade (i = 3-5);
b is the width of the fenders;
n is the number of blades,
and installed in increments