RU111480U1 - DEVICE FOR INCREASING THE COUPLING WEIGHT OF THE MACHINE-TRACTOR UNIT - Google Patents

Abstract

 A device for increasing the coupling weight of the machine-tractor unit, including the drawbar of the trailer and an additional rigid coupling in the form of a cable, characterized in that the ends of the cable are fixed motionless through the intermediate supports in the form of a tension, upper and lower power pulleys, while the tension pulley is fixedly mounted on the bracket the drawbar, and the upper and lower power pulleys are rigidly fixed to the tractor frame, the drawbar of the trailer is connected to the tractor by the coupling earring and a finger through a damping spring.

Description

The utility model relates to the field of trackless vehicles and can be used in machine-tractor units when performing agricultural work to increase the adhesion of the unit to the soil and reduce slipping.

A known road train containing a tractor and an active trailer with a mechanical wheel drive from the tractor, a drawbar associated with a slewing ring, and a mechanism for transmitting power from the tractor to the trailer in the form of a single-stage gearbox (ed. St. No. 93057790, class B62D 63/08 , B62D 53/02, B62D 59/04). The rear drive axle of the tractor is connected by a cardan shaft through the gearbox to the axle of the trailer axle, with the gearbox mounted on the trailer's drive axle, the gearbox control panel on board the trailer, and the cardan shaft connected to the drawbar with articulated suspension.

The disadvantage of this design is its complexity and a decrease in the efficiency of the transmission as a whole due to an increase in the number of units involved in the transmission of torque.

The closest in technical essence to the claimed solution is a device for increasing the adhesion force on driving wheels of a road train (patent for floor model No. RU 76884, class B62D 63/00), containing a pull hook and a drawbar drawbar hitch connecting the towing vehicle and trailer. The drawbar hook and drawbar hitch are additionally connected by a rigid hitch, the trailer and tractor are connected by a cable fixed at one end to the drawbar drawbar hitch and the other end to an additional drawbar hook. The cable has an intermediate support with a roller and a tension mechanism.

The disadvantage of the invention is the unreliable fixation of the parts of the hitch and the need for additional adjustments when changing the trailer.

The purpose of the invention: ensuring reliable fixation of all parts of the coupling device and increasing the coupling weight of the machine-tractor unit.

This goal is achieved in that the device for increasing the coupling weight of the machine-tractor unit, including the drawbar of the trailer and an additional rigid coupling in the form of a cable, unlike the prototype, the ends of the cable are fixed motionless through intermediate supports in the form of tension, upper and lower power pulleys, In this case, the tension pulley is fixedly mounted on the drawbar bracket, and the upper and lower power pulleys are rigidly fixed on the tractor frame, the drawbar of the trailer is connected to the tractor by the coupling eye and the finger through the damping th spring.

A device for increasing the grip weight of a machine-tractor unit may include agricultural machines as a trailer when performing work in the field or transporting along the road.

The technical result is aimed at increasing the adhesion force of the wheel with the road by increasing the grip mass, as a result of which the traction on the driving wheels increases.

As a result of a patent search, the authors did not find an identical technical solution with a similar result, which proves the technical solution meets the criterion of "novelty."

Figure 1 presents a General view of a device for increasing the grip weight of a machine-tractor unit.

Figure 2 presents the system of forces acting during operation of the device to increase the grip weight of the machine-tractor unit.

A device for increasing the grip weight of a machine-tractor unit consists of a tension pulley 3, cable 4, upper 5 and lower 6 power pulleys. The axis of the pulley 3 is fixed in the bracket, which is welded to the drawbar 2 of the trailed implement 1. The upper and lower power pulleys rotate on the axes of the brackets, which are welded to the frame of the tractor itself. The upper and lower ends of the cable are fixed as stationary. The drawbar is fixed in the hitch earring 9 with a steel pin 8. The hitch includes a damping spring 7, which is designed to reduce shock loads on the frame of the machine and tractor unit and the connecting elements of the hitch itself.

A device to increase the grip weight of the machine-tractor unit works as follows. With a uniform movement of the tractor and constant resistance P _{f of the} trailed implement 1, the damping spring 7, due to a certain rigidity, works in a given interval, while maintaining the total length of the spring itself. The adhesion force of the machine-tractor unit in this case is equal to the adhesion force of the drive wheels:

G _sc = G _sc.

With increasing resistance P _{f of the} trailed implement, the damping spring of the coupler is compressed under the pressure of the earring 9, which is rigidly fixed with a finger 8 on the drawbar 2 of the trailed implement. From the side of the compressible spring, an elastic force arises

F _CPR = s · Δ,

where c is the stiffness of the spring, N / m; Δ is the deformation of the spring.

The distance between the tractor and the trailed implement increases, and as a result, the distance between the axles of the tension 3, upper 5 and lower 6 power cylinders increases. This leads to stretching and deformation of the cable 4, as well as to transfer the elastic force F to the _exercise center idler pulley, wherein a force couple with moment M _F-F1 :

M _F-F1 = F _control · a = c · Δ · a ,

where a is the shortest distance between the axles of the drawbar and idler pulley

Power moment expressed through power and :

M _F-F1 = F · 2r,

where r is the radius of the idler pulley.

A slightly deformed cable is pulled by a pulley located on the drawbar of a trailed implement. Due to the occurrence of normal forces in the branches of the cable N ₁ and N ₂ , the pressure on the upper and lower power pulleys increases. The grip weight increment is due to the vertical components of the cable tension forces G ₁ and G ₂ :

G ₁ = N ₁ Cos (α),

G ₂ = N ₂ Cos (β),

The additional coupling weight of the machine-tractor unit in this case is equal to:

G _d.s.sc. = G ₁ + G ₂ ,

Under the action of an additional grip weight G _add.sst total grip weight of the drive wheels will be:

G _sc = G _sc . _{Drive wheels} + G _{extra sc}

where G _{sc.sved.koles} - the grip weight of the drive wheels without the device.

After overcoming a dangerous section of the road, the spring returns to its original state under the action of elastic forces, while the cable tension weakens and the machine-tractor unit operates in normal mode.

Thus, the use of a device to increase the grip weight of the machine-tractor unit really increases the grip weight and reduces slipping of the machine-tractor unit.

This device is mainly used on wet dirt roads when performing agricultural work.

Claims (1)

A device for increasing the coupling weight of a machine-tractor unit, including a drawbar of a trailer and an additional rigid coupling in the form of a cable, characterized in that the ends of the cable are fixed motionless through intermediate supports in the form of a tension, upper and lower power pulleys, while the tension pulley is fixedly mounted on the bracket the drawbar, and the upper and lower power pulleys are rigidly fixed to the tractor frame, the drawbar of the trailer is connected to the tractor by the coupling earring and a finger through a damping spring.