SU882796A2 - Wheeled vehicle - Google Patents

Description

(54) WHEELED VEHICLE

I

This invention relates to brake means, in particular to brake systems of vehicles used in the automotive and tractor industries.

According to the main author. St. No. 578209, a wheeled vehicle is known, which contains a hydrostatic transmission with a hydraulic pump driven by the engine and connected through a pressure and return hydraulic lines to a hydraulic motor kinematically connected to the drive wheels of the suspension system, the driving and driven wheels of which are equipped with brakes controlled by a brake valve connected to the pneumatic system, a single-acting hydraulic cylinder with a spring loaded piston and a rod connected to the brake valve, while the working cylinder of the hydraulic cylinder connects ene return line, a hydraulic accumulator connected to the return pipe 1.

The disadvantage of a vehicle is the need to have a hydraulic accumulator of considerable working volume, which increases the weight and cost of the vehicle and worsens the layout. For example, for a volumetric hydraulic transmission of a tractor of the Minsk Tractor Plant, when the pump is supplied with an asphalt flow rate of l / min and the response time of the pneumatic system is 0.5 s, the working volume of the battery should be 2.5 liters.

The purpose of the invention is to improve the overall layout of the vehicle, reducing its weight and cost by reducing the working volume of the hydraulic accumulator.

This is achieved by the fact that the hydroaccumulator is connected to the return pipeline by means of a direct-acting hydrovalve, the cavity of which is controlled is connected to the return pipeline, and the control cavity is connected to the hydroaccumulator.

The drawing shows a hydraulic diagram of a wheeled vehicle with hydrostatic transmission.

Claims (3)

The transmission consists of an engine I, a hydraulic pump 2 connected by pressure hydraulics 3 and a return pipe 4 with a hydraulic motor 4. The hydraulic motor is connected through a reversing device 6, the main gear 7 and half axles 8 with driving wheels 9. The hydraulic cylinder 10 is unilateral, the piston cavity 1 i connected by hydroline 12 to pipe 4, and its porhieHb 13, spring-loaded by spring 14, via rod 15 acts on lever 16 of brake valve 17 connected by pneumolium 18 to source 19 of compressed air, and pneumatic lines 20-23 to membrane pneumatic tubes. Lindra 24 leading 9 and slave 25 wheels. The lever 16 is connected via an earring 26 to the pedal 27 of the foot control. The indirect hydraulic valve 28 by the controlled cavity 29 is connected by hydraulic line 30 to the pipeline 4, the drain cavity 3 is connected by hydraulic line 32 via a non-return valve 33 to the pressure hydraulic line 3. The controlled cavity 29 is connected to the control cavity 36 via the choke hole 34 of the valve 35. The control cavity 36 is connected by hydroline 37 to the cavity 33 of the hydroaccumulator 39. The vehicle operates hardly in its own way. When moving, the engine 1 transmits the torque to the hydraulic pump 2, which guides the working fluid under pressure to drive the hydraulic motor 5. The hydraulic motor, through the reversing device 6, the main gear 7 and the semi-axle 8, transmits the torque to drive the driving wheels 9. At the same time, the working fluid from the hydraulic pump 2 3 enters under pressure into the hydraulic motor 5, and from it, without pressure, returns along the hydroline to the input cavity of the hydraulic pump 2. The piston J3 of the hydraulic cylinder 10 is supported by the spring 14 in the upper position, and the associated rod 15 does not act on the lever 16 of the brake valve 17. When the vehicle is braked by hydrostatic transmission, the hydraulic motor 5 starts to operate in the hydraulic pump mode. In this case, the pressure in the pipeline 4 increases, the working fluid through the hydroline 12 enters the piston cavity 11 of the hydraulic cylinder 10, overcoming the resistance of the spring 14, moves the piston 13 and the rod 15, and acting on the lever 16 turns on a valve 17 which connects the brake chambers to the source 19 compressed air, providing braking wheels. At the same time, along hydraulic line 30, the working fluid under pressure enters the controlled cavity 20 of valve 28. Here the flow is split. A part of it through the throttle hole 34 enters the control cavity 36 and further into the hydraulic cavity 38, the hydraulic accumulator 39 and, pressing the elastic element, ensures a smooth increase of pressure in the control cavity 36, controlled cavity 29 and hydraulic lines 30 and 3 and, accordingly, smooth increase braking force, providing synchronous braking of the driven and driving wheels. Another part of the flow, raising the shutter of the clathan 28, enters the drain cavity 31 and further along the hydroline 32 through the check valve 33 into the hydroline 3. When the hydraulic accumulator is connected to the control valve of the hydraulic valve, a small part of the flow is prevented from operating directly in the hydraulic accumulator. The main flow is poured from cavity 29 into the cavity of 31 minutes hydroaccumulator. Due to this, a significant reduction in the working volume of the hydroaccumulator is achieved. Reducing the working volume of the hydroaccumulator reduces its dimensions and weight, reduces the cost, improves the overall layout of the vehicle. It is possible to more conveniently, freely position the driver. . In addition, the weight of the vehicle is reduced. Formula of invention Wheeled vehicle according to aut. St. No. 578209, characterized in that, in order to improve the overall layout of the vehicle, reduce its weight and cost by reducing the working volume of the hydroaccumulator, the hydroaccumulator is connected to the return pipeline through a indirect hydraulic valve, controlled by a cavity, which is connected to the return pipeline, and control cavity to the hydroaccumulator. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 578209, cl. B 60 T 8/12, 1973. ABOUT 25 about 5a Jf 38 37 Vw D6 ABOUT H7fftutfe / fy