The hydraulic drive vehicle

 

The invention relates to transportation engineering and is intended for use on vehicles, in particular caterpillar machines. The hydraulic drive vehicle includes an adjustable pump 1 and the hydraulic motor 2, which are connected by a hose with the formation of a closed loop. Pump recharge 5 is mounted on the same shaft 6 with adjustable pump 1 connected to a closed circuit through the check valves 7 and 8 and has a drain in the case of an adjustable pump 1. The output of the pump recharge 5 is connected to the input through the case of an adjustable pump 1, the cooler 9 and the filter 11 with the formation of a closed loop, which is connected with the working space of the hydraulic accumulator 19, the minimum amount which is selected from certain conditions. The technical result - the reduction of the size and weight of the hydraulic drive, increase efficiency. 3 C.p. f-crystals, 2 Il.

The invention relates to transportation engineering and is intended for use on vehicles, in particular caterpillar machines.

Known volumetric hydraulic transmission transport vehicle containing the pump and the hydraulic actuator, power hydroline and communicated with niasse a hydraulic accumulator with the working cavity which is communicated to the outlet of the drain hose and the inlet of hydroline recharge (see the description of the patent RF №2084354 from 20.07.97, M CL 60 To 17/10). The hydraulic actuator includes drainage hydroline, and the battery is made in the form of a cylinder with a piston, the cavity in the piston rod which is connected to the drain hydroline.

However, this device has limited capacity, due to the fact that the battery is connected to the drains does not create sufficient pressure in the hydraulic system for a vehicle having a large capacity and working in intensive mode. When working in these conditions these devices becomes less reliable due to insufficient pressure in the system or fall, due to the lack of pump recharge, increases the power loss of hydrostatic transmission in General, decreases its efficiency. If you use this device in vehicles with large capacity, it is the high heat of the working fluid. So you want the cooler by blowing a stream of air, especially when used in caterpillar machines with closed case.

Closest to the claimed solution (prototype) is a hydraulic drive vehicle containing interconnected hose with the formation of a closed loop adjustable is Oleniy closed circuit through check valves to the case of an adjustable pump, cooler and filter (see description for ed. St. USSR №1624215 from 12.03.88, M CL F 15 21/04, F 16 N 39/02). The device includes a heater of the working fluid is made in the form of capacity installed therein a heating device, and an associated suction gedaliya with the pump inlet feed, indicated by a housing of an adjustable pump and switchgear with sink. Thus equipped with an additional hydraulic pump mounted in the heater and connected to the pump inlet feed with additional hydroline.

In this hydraulic pump inlet feed indicated by a housing of an adjustable pump with discharge, which implies a tank capacity of at least (according to the requirements for pumps), aluminates performance pump recharge. The discharge of the working fluid in the tank is foaming, defoamers and a large amount of the working fluid to have the time to collapse of the foam. In addition, the tank is connected with the atmosphere, and at the contact of the fluid with air pollution with dust and need to frequently change the filter, and the chemical processes of oxidation decreases its lifetime. When working hydropro the Tr formed a vacuum (negative pressure) that affect the operation of the pump feeding, especially at peak load, you may cavitation mode. This worsens the recharge hose (low pressure) of a closed loop, which affects the operation of the hydraulic drive and its efficiency. The presence of the tank with the working fluid increases the size and weight of the hydraulic drive, which impairs its placement in the vehicle.

An object of the invention is to reduce the size of the hydraulic drive and the amount of the working fluid, increasing efficiency, and reducing contamination of the working fluid and as a consequence, reduce the frequency of changing the filter and fluid.

The problem is solved in that the hydraulic drive containing the main pump and the hydraulic motor, connected by a hose with the formation of a closed loop, pump feed, mounted on the same shaft with adjustable pump and connected to the hose closed circuit through check valves to the case of an adjustable pump, cooler and filter, pump feed, through the case of an adjustable pump, cooler and filter, is connected by a hose to its entrance with the formation of Zambia:

Vp=tVC

where Vp- the volume of the working cavity;

temperature coefficient of volume expansion of the working fluid;

t is the temperature of the working fluid;

VC- the volume of the hydraulic drive.

The hydraulic accumulator is made in the form of capacity divided by the working and non-working cavity of the movable partition, while the working cavity in the working regime is under pressure from outside the cavity. The pressure is applied by pump recharge or spring.

This design reduces size and weight of the hydraulic drive, the amount of working fluid, increasing efficiency, and reducing contamination of the working fluid.

In the proposed invention the working fluid is in a closed loop at a pressure in working condition, there is no communication with the atmosphere and therefore does not cause contamination and oxidation of the working fluid, there is no drain tank and, as a consequence, the expansion of the working fluid does not require additional devices for damping foam.

Calculated volume of the working cavity guy is in and the amount, and to increase the efficiency of the hydraulic drive due to better content at a gauge pressure at the pump inlet feed.

In Fig.1 shows a diagram of the hydraulic drive vehicle with excessive pressure in the hydraulic accumulator created by the pump feed. In Fig.2 shows a variant of the hydraulic accumulator.

The hydraulic drive vehicle includes an adjustable pump 1 and the hydraulic motor 2, connected by a hose 3 and 4 with the formation of a closed loop. Pump recharge 5, mounted on the same shaft 6 with adjustable pump 1 is connected to the hose 3 and 4 closed loop through the check valves 7 and 8 and then to the chassis (not shown) of the regulated pump 1. The cooler 9 is installed in the drain hydroline 10 of the hydraulic pump 1, and through the filter 11 is connected to hydroline with the pump inlet feed 5. The output 12 of the pump recharge 5 through the pressure relief valve 13 is connected by hydroline 14 with the case of an adjustable pump 1, and then through the drain hydroline 10, the cooler 9, the filter 11 is connected by hydroline 15 with the inlet of the pump feeding, forming a closed loop. Pump recharge 5 through the orifice 16 is connected to the system 17 controls the hydraulic actuator, and further connected to the drain line 18 connecting the adjustable housing of the pump 1 and motor 2.

Vp=tVC

where Vp is the volume of the working cavity;

temperature coefficient of volume expansion of the working fluid;

t is the temperature of the working fluid;

VC- the volume of the hydraulic drive.

If there are leaks in the hydraulic system, the volume of the working cavity it is necessary to increase the value of these leaks. Excess pressure in the working cavity 20 may be formed by a spring 24 mounted outside the cavity 21 (see Fig.2).

Maximum allowable pressure in the hose 3 and 4 determine the safety valves 25 and 26.

The filling of the hydraulic drive vehicle passes through the valve 27.

The device operates as follows. When the rotation shaft 6 of the regulated pump 1, rotates the pump recharge 5, the and 1 and motor 2. The excess working fluid through the pressure relief valve 13 and hydroline 14 merge in the case of an adjustable pump 1. Then the working fluid through the drain hydroline 10, the cooler 9, the filter 11 and hydroline 15 to the input of the pump feeding. From the pump recharge 5 working liquid under the pressure created by a safety valve 13, passes through the orifice 16 to the system 17 controls the hydraulic drive and hydroline 23 to the outside of the cavity 21 of the hydraulic accumulator 19. The pressure of the working fluid is passed through the movable wall 22 on the working cavity 20 and an excessive pressure (when the hydraulic actuator) in the hydroline 15 at the inlet of the pump recharge 5, hydroline 14, the case of an adjustable pump 1, the drain hydroline 10, the cooler 9, the filter 11, which improves the working conditions of the pump recharge 5, especially at low temperatures when the viscosity of the working fluid increases, and maximum modes of operation of the hydraulic drive. In addition, the hydraulic accumulator 19 provides compensation for temperature changes of the fluid and leaks if any.

Excess pressure in the working cavity 20 instead of the pressure from the pump recharge through the above loop can create is as with running, and when the hydraulic drive.

Thus, the proposed hydraulic drive provides a reduction of the working fluid filled in the hydraulic actuator, reducing the size and weight of the hydraulic drive, increase efficiency, and reduce pollution of the working fluid, which allows the use of the hydraulic drive in intensive mode over a wide temperature range and in sealed tracked vehicles.

The proposed device of the hydraulic drive vehicle manufactured by JSC "Kharkiv tractor plant. S. Ordzhonikidze, installed on two prototypes light multipurpose crawler Transporter, which were presented at the exhibition dedicated to the 70th anniversary of the plant, and currently are being tested.

Small overall dimensions hydraulic allowed to place it in the same volume engine compartment of a test sample in which it was previously absent. Preliminary road tests confirmed the functioning and efficiency of the proposed hydraulic drive.

Claims

1. The hydraulic drive vehicle containing an adjustable pump and a hydraulic motor connected between hydroline otklucheny to the hose closed circuit through check valves to the case of an adjustable pump, cooler and filter, characterized in that the outlet of the pump feeding through the case of an adjustable pump, cooler and filter hose connected to its input with the formation of a closed loop connected with the working space of the hydraulic accumulator, the minimum amount of which are selected from the condition

Vp=tVC,

where Vp is the volume of the working cavity;

temperature coefficient of volume expansion of the working fluid;

t is the temperature of the working fluid;

VC- the volume of the hydraulic drive.

2. The hydraulic drive vehicle under item 1, characterized in that the hydraulic accumulator is made in the form of capacity divided by the working and non-working cavity of the movable partition, while the working cavity in the working regime is under pressure from outside the cavity.

3. The hydraulic drive vehicle according to PP.1 and 2, characterized in that the pressure is applied by pump feeding.

4. The hydraulic drive vehicle according to PP.1 and 2, characterized in that the pressure is applied by the spring.



 

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FIELD: transport engineering; self-propelled wheeled vehicles.

SUBSTANCE: proposed vehicle contains frame 1 with cab 9, front and rear steerable wheels 4, 6 and middle wheels 5, engine placed behind the cab along vehicle and covered by hood 11. hydrostatic transmission contains pumping station 21 consisting of matching reduction gear driven by engine placed behind the cab, and three pumps connected by pipelines with hydraulic motors providing separate drives of wheels. Hydraulic motors are arranged along frame 1 between sidemembers on solid brackets made in form of boxes with flanges connected with wall of side member between its webs. Invention makes it possible to create ecologically clean and reliable multipurpose all-wheel-drive vehicle of high cross-country capacity with hydrostatic transmission to drive all wheels.

EFFECT: provision of convenient mounting and servicing of transmission units.

5 cl, 7 dwg

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