The hydraulic wheeled vehicles

 

The invention relates to mechanical engineering and can be used in hydraulic systems of tractors and other self-propelled and road-building machines. The hydraulic actuator includes pump unit with a drive motor 4. It consists of three unregulated pumps 1, 2, 3 with three position proportional valve 8. Four-way valve 15 is connected to a pressure hydroline 14 with pump unit and hose 16, 17 with hydraulic motors 18 and 19. The cylinder 13 is installed through the three-position valve 10 to the pressure of hydroline 14. Managed the flow control 20 and 21 introduced in the area between four-valve 15 and the hydraulic motors 18 and 19. Hydraulic accumulator 28 is introduced into a pressurized hydroline 14 through a two-position valve 26. The technical result - the reduction of the energy consumption in the hydraulic system, eliminating movement of the vehicle “Hughes” and the exception spinning wheels in straight-line motion. 1 Il.

The invention relates to mechanical engineering and can be used in hydraulic systems of tractors and other self-propelled is a (see RF patent №2098292, MCI 60 To 17/10, 1997). containing the pump and kinematically associated with the wheels of the vehicle reversible hydraulic motor. Hydraulic motor and pump are connected by hose through the three-position valve. In the section between the pump and the three position valve pressure and drain the hydroline are connected via the controlled shut-off valve. In the known transmission removed the wheels from locking and stable braking of the vehicle with hydrostatic transmissions. However, the hydraulic actuator is intended for the propulsion of a major axis that defines low traction and maneuvering ability of the vehicle.

The closest in technical essence of the present invention is a hydraulic self-propelled machines (see RF patent №2037434, MCI 60 To 17/10, 1995), containing the pump with engine-driven, three-position spool valve, operating channels which are used for connection of the motors, the control lever speed and direction, and oil tank. The hydraulic drive has two sets of motors respectively for the front and rear axles, self-propelled machine. In addition to the ü to control the hydraulic cylinder mounted equipment. Direct connection blocks hydraulic motors driving wheels of both axles makes the design simple with a sufficiently high efficiency of the hydraulic drive, defining thereby increasing the traction properties of the machine. Perform valve with two chetyrekhfotonnymi sections provide the capabilities for each of the major axes of the driving modes “forward” and “back”, “braking” and “roll forward”. However, the drawback of such a hydraulic drive is the lack of locking of the wheels when slipping and constant frequency rotates the shafts of the motors when turning due to the absence of the scheme managed flow control, which causes movement of the machine “Hughes”. To power the hydraulic pump is used for high performance. This leads to large energy losses during movement of the vehicle.

The invention aims at eliminating the above drawbacks.

This is due to the fact that the hydraulic drive containing a pump unit with a driving engine and connected pump hydroline with four-valve, knitted hose with hydraulic motors and a hydraulic cylinder mounted via three position hydroaromatic managed flow control. In pressure hydroline entered the hydraulic accumulator through a two-position valve. Pump installation is composed of three parallel connected unregulated pumps with proportional three-position directional control valve.

Through the use of a hydraulic actuator controlled flow regulator varies the flow of the working fluid during the rotation of each motor, and therefore, the rotational speed, thereby eliminating the movement of the vehicle “Hughes”.

The use of hydraulic three unregulated parallel-connected pumps with three position proportional control valve and a hydraulic accumulator reduces energy losses in the hydraulic drive compared to the prototype due to the energy recovery fluid.

The drawing shows the principal hydraulic scheme of the proposed hydraulic wheeled vehicles.

The hydraulic drive wheel of the vehicle includes three parallel connected unregulated pump 1, 2, 3 with the driving motor 4 related work routes 5, 6, 7 proportional controlled valve 8, through which the hydroline 9 through the three-position gidroraspredeliteli the valve 15, related work the channels 16, 17 with the hydraulic motors 18 and 19. Moreover, the working channel 16 of the valve 15 is connected by a hose with hydraulic motors 18 and 19 through controlled flow control 20 and 21 associated with the rotation mechanism of the vehicle (not shown). In addition, the hydraulic actuator includes a hydraulic tank 22, a filter 23, a valve 24, valve 25, and a controlled valve 26 associated with hydroline 14 with the valve 8 on the one hand and hydroline 27 with the hydraulic accumulator 28 on the other.

The hydraulic drive wheel of the vehicle is as follows.

The working fluid from the tank 22 by means of pumps 1, 2, 3 is pumped through a proportional spool valve 8, through the control valve 10 in the cylinder attachments or through the control valve 15 and the controlled flow control in hydraulic motors 18 and 19, which directly transmit the rotational movement to the drive wheels of the machine. When turning vehicle operated flow control change the flow rate of the working fluid in the hydraulic motors 18 and 19, causing the wheels of the vehicle rotate with different angular velocity. Chetyrehokisi is At the position of the spool valve “forward” is provided by the flow of working fluid from the pump 1, 2, 3 through the control valve 8, hydroline 14, 16, controlled flow control 20 and 21 to the hydraulic motors 18 and 19 and drain it through the working channel 17 into the tank 22. Due to this, the wheels receive a rotational movement corresponding to the movement of the machine forward. When the position of the valve in the position “Decel” working channels 16, 17 are locked. The working fluid enters the hydraulic accumulator 28, or merges into the tank 22 through the valve 25. When the position of the valve in the position “back” similar position “forward” with the difference that the working fluid is supplied to the motors in the opposite direction, so the wheels get rotation corresponding to the movement “back”. When the position of the spool in the position of “neutral” operating channels 16 and 17 are interconnected, and the discharge channel 14 from the drain. The working fluid in the hydraulic motor not supplied and drained from pumps through four-way valve 15 back into the tank 22. Similarly controlled by a hydraulic cylinder accessories 13 through valve 10. When moving the spool is proportional to the three-position valve 8 from the leftmost to the rightmost position of Prosti and the rotational speed of the hydraulic motors 18 and 19, consequently, the speed of the vehicle. Hydraulic accumulator 28 is used for energy recovery and is automatically activated by using a two-position valve 26 when the pressure in the hydraulic system exceeds the beforehand set value.

Claims

The hydraulic drive wheel of a vehicle, containing a pump unit with a driving engine and connected pump hydroline with four-valve, knitted hose with hydraulic motors and a hydraulic cylinder mounted through the three-position valve in the pressure hydroline, characterized in that it introduced in the area between four-valve and hydraulic motors driven flow control and pressure hydroline - hydraulic accumulator through a two-position valve, when this pump unit is made consisting of three parallel connected unregulated pumps with proportional three-position directional control valve.



 

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