UA151779U - Self-propelled chassis with front steering axle - Google Patents

Abstract

The self-propelled chassis consists of a power unit with driving wheels and a frame, to the front beam of which a pivoting bridge is attached via a vertical shaft and a horizontal cylindrical joint, allowing for 180° circular movement, and driven by a two-armed swivel lever and a vertical shaft from power hydraulic cylinders. In the kinematic chain between the two-armed swivel lever and the vertical shaft, a gear pair is installed, where the gear is mounted on the vertical shaft, and the wheel is on the shaft of the two-armed lever. Additionally, a lever connected by a joint to an additional power hydraulic cylinder is installed on the vertical shaft.

Description

a rotary bridge with 180" freedom of circular movement and drive through a two-arm rotary lever and a vertical shaft from power hydraulic cylinders. A gear pair is installed in the kinematic chain between a two-arm rotary lever and a vertical shaft; the gear is mounted on the vertical shaft, and the wheel is on the shaft double-armed lever. At the same time, a lever is installed on the vertical shaft, which is hingedly connected to an additional power hydraulic cylinder.

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Fig. 1

The proposed utility model belongs to agricultural tractors and can be used in a self-propelled chassis to control the turn during movement, to provide a turn in place around one of the rear wheels and to turn at 1807 of the front guide bridge when mechanized suspension of agricultural machines and implements in the inter-axle space.

It is known 1| self-propelled chassis with a hinged system on the front swing axle and a frame having two longitudinal C-shaped beams, front and rear beams, a front axle with a turning mechanism, a vertical shaft and a double-arm swing arm. The arms of the lever are located at an angle to each other. Each of the two arms of the double-arm rotary lever is connected to one of 3 two hydraulic cylinders, the other ends of which are connected to the front beam of the frame.

The cavities of the first cylinder are connected to the hydraulic pump and tank through the distributor. The cavities of the second cylinder are connected by hydraulic lines to the metering pump of the hydraulic power steering. The well-known technical solution provides control of the direction of movement of the self-propelled chassis and the operation of the front hinged system on the swing bridge when hanging machines and tools in the interaxial space.

The disadvantage of the known technical solution is that the left and right rotation of the self-propelled chassis occurs at different fluid pressures in the drive, since one hydraulic cylinder is used, which has one piston and rod cavity. In addition, the known technical solution does not allow turning around one of the rear wheels.

The closest analogue (21) is devoid of these shortcomings, in which two power hydraulic cylinders are used to control the direction of movement. Fluid is pumped into the piston cavities of the power hydraulic cylinders (into one of them, depending on the direction of rotation) by the hydraulic power steering metering pump. In the neutral position of the front rotary bridge, the arms of the two-armed rotary lever are located at an angle V0 to the longitudinal axis of the machine.

The tygens of the Vo angle is determined by the formula v juro - st where I, B are the base of the self-propelled chassis and the track of the rear driving wheels.

Due to the specified position of the arms of the two-armed rotary levers, it is possible to turn the self-propelled chassis around the rear left or right driving wheels. With the specified

When turning in place, the extreme positions of the double-arm swing arm are "dead", which ensures a stable positioning of the front swing axle in position for turning around one of the rear drive wheels. Control of rotation relative to one of the rear wheels is carried out by injecting fluid into the rod cavity of one of the power hydraulic cylinders (depending on the direction of rotation) with a hydraulic pump.

The disadvantage of the closest analogue is the impossibility of turning the front pivot bridge by 180" when hanging a machine or tools in the interaxial space. The reason is the difficulty of ensuring the rotation of the double-armed rotary lever at 1807 due to the limited construction volume when installing the third (additional power hydraulic) cylinder.

The task is solved due to the fact that when installing an additional power hydraulic cylinder for driving the front axle by 180", a gear pair is installed in the kinematic chain for controlling the rotation of the self-propelled chassis during movement and in place around one of the rear drive wheels.

At the same time, the gear is installed on the vertical drive shaft of the rotary bridge, and the wheel, made in the form of a toothed sector, is installed on the shaft of the double-arm rotary lever. A lever coaxial with an additional power hydraulic cylinder in the neutral position of the rotary bridge is installed on the vertical shaft. The cavities of the additional power hydraulic cylinder are connected to the hydraulic pump and tank through an additional hydraulic distributor.

When turning the front swing axle by 1807", the two-arm swing arm turns to an angle е, which is equal to о е-180

Mzp where zp is the gear ratio of the gear pair.

The angles V0 of the initial setting of the two-arm rotary lever are determined by the following formula: 909 (ex -1)-here 21

In --ШШ8Ш2----- zp

Angle A between the directions of the arms of the two-arm rotary lever d-1802-280.

In Fig. 1-2 shows the kinematic diagram of the drive of the front rotary axle. In Fig. C shows the hydraulic control scheme of the front swing axle.

The proposed self-propelled chassis with a front swing axle includes a front beam 1 of the frame, a vertical shaft 2 of the drive of the front swing axle 3, a cylindrical joint 4 of the balance suspension of the front swing axle 3, a double-arm double-swing lever, a toothed pair made in the form of a gear 6, meshed with which includes the toothed sector 7. Two power hydraulic cylinders 8 are connected to the arms of the two-arm rotary lever 5. The other ends of the power hydraulic cylinders 8 are hingedly connected to the front beam 1 of the frame of the self-propelled chassis. A lever 9 connected to an additional power hydraulic cylinder 10 is installed on the vertical shaft 2. The second end of the additional power hydraulic cylinder 10 is hingedly connected to the front beam 1. When the front axle Z is in a neutral position, the lever 9 and the axis of the additional power hydraulic cylinder 10 are located along one direct The piston cavities of the power hydraulic cylinders 8 (Fig. 2) are connected to the metering pump of the hydrovolume steering control, and the rod cavities through the hydraulic distributor 11 are connected to the hydraulic pump 12 and the tank 13. The cavities of the additional power hydraulic cylinder 10 are connected to the hydraulic pump through the additional hydraulic distributor 14 11 and by 12.

During the movement of the self-propelled chassis, liquid from the hydraulic volume steering pump-doser is supplied under pressure into the piston cavity of one of the power hydraulic cylinders 8 (depending on the direction of rotation of the self-propelled chassis). From the piston cavity of the second power hydraulic cylinder 8, the liquid is drained through the dosing pump. Under the action of the force of the power hydraulic cylinder 8, the two-arm rotary lever 5 rotates, and together with it, the toothed sector 7. The rotation from the toothed sector 7 is transmitted to the gear 6, the vertical shaft 2 and the rotary bridge 3. The rotation of the two-armed rotary lever 5 occurs at a smaller angle, than the angle of rotation of the rotary bridge Z and, the smaller, the greater the gear ratio zp of the gear transmission. When turning to the left and to the right, pressure is supplied to the piston cavities of the power hydraulic cylinders 8. This allows to ensure the equality of fluid pressure in the hydraulic power steering both when turning to the right and when turning to the left.

When turning in place around the right or left rear drive wheels, the fluid pressure from the hydraulic pump 12 through the hydraulic distributor 11 is fed into one of the rod cavities (depending on the direction of rotation) of the power cylinders 8. From the rod cavity of the second hydraulic cylinder, the liquid through the hydraulic distributor 11 goes to drain into the tank 13. In this case, the rotary bridge turns to an angle equal to 907-DVo, and the corresponding arm of the two-armed rotary lever 5 and the rod of the power hydraulic cylinder 8 form a "dead" position. This ensures the stability of the positioning of the front rotary bridge 3.

When turning the front rotary bridge Z to an angle of 1807 in the case of mechanized hanging of tools and machines in the interaxial space of the self-propelled chassis, the fluid pressure from the hydraulic pump 12 through the additional hydraulic distributor 14 enters one of the cavities of the additional power hydraulic cylinder 10. The liquid from the second cavity of the additional power hydraulic cylinder 10 through the additional the hydraulic distributor 14 enters the tank 13. With one stroke of the rod of the additional power hydraulic cylinder 10, the lever 9, the gear 6, the vertical shaft 2 and the rotary bridge Z are rotated by 180". At the same time, the lever 9 and the rod of the power hydraulic cylinder 10 move from one "dead" position in another.This ensures a stable position of the swing bridge

With in its initial and final positions. When turning in the opposite direction, the pressure of the fluid with the help of an additional hydraulic distributor is fed into the second cavity of the additional power hydraulic cylinder 10, and from the first - into the tank 13. When turning the rotary bridge C by 1807, the two-armed rotary lever 5 turns to a smaller angle, which is determined by the ratio of 180" to gear ratio of gear pair.

Thus, the proposed design of a self-propelled chassis with a front swivel bridge allows you to control the direction of movement of the self-propelled chassis with the same fluid pressure in the power hydraulic cylinders both when turning to the left and when turning to the right. The proposed technical solution provides the ability to control the rotation of the self-propelled chassis on the spot around the left or right rear driving wheels. It is also possible to turn the front pivot bridge by 180" when hanging machines and tools in the interaxial space of the self-propelled chassis.

Sources of information: 1. Pat. Mo. 146322 for the utility model of Ukraine "Self-propelled chassis with a hinged system on the front swing axle" dated February 11, 2021. because 2. Pat. 148809 for a useful model of Ukraine Self-propelled chassis with a front swing axle.

Claims (4)

USEFUL MODEL FORMULA 1. A self-propelled chassis, consisting of a power unit with drive wheels and a frame, to the front beam of which a vertical shaft and a horizontal cylindrical joint are connected to a rotary bridge, which has freedom of circular movement by 180" and a drive through a two-armed rotary lever and a vertical shaft from the power hydraulic cylinders, which is characterized by the fact that a gear pair is installed in the kinematic chain between the two-armed rotary lever and the vertical shaft; and the gear is installed on the vertical shaft, and the wheel - on the shaft of the two-armed lever; while the vertical shaft is equipped with a lever connected by a hinge with an additional power hydraulic cylinder. 2. The device according to claim 1, which differs in that the cavities of the additional power hydraulic cylinder are connected to the hydraulic pump and tank through an additional hydraulic distributor. Z. The device according to claim 1, which differs in that the angle of the initial setting of the two-armed control lever is determined by the formula of the VOSIV - form 21 Vo VZ- « -- - - -АА5. - MZP; where B, I - track and base of self-propelled chassis; zp is the gear ratio of the gear pair, and the angle between the arms of the two-armed rotary lever is А-1807-2р0о. 4. The device according to claim 1, which differs in that the wheel is made in the form of a toothed sector. y, Uyah ssh det i TM 000 -K NEK ko NN ne min Vaj r y zni EE i eh i schi gu ME B "code NN iii i N i : ! EE not and and В BO В Fig. I'm her Ku "Zh A not Zasch She Ne: Lu и и хо : Z Be Й ; Uh : N SYA N Her t : : Uh yi yi - to E : Eh ve -zasovsheh yi yi n ya KYA KOH. rebus Y KU a 23 y shk IZ nya chn b their KU wall y "YAZ 14 Z A MO roya still for a anya KV. 3 Sche; men y vid K ekho kre yu Y skh K what PASTA UK Z Х ШЧАХ нный 1475 K Clinics DV 33. Y M oddllllltintitnnnnnnn s EE i vovka ZHY otsiki ooo siy E i z: : dak ne Y: moe EN x 1. ey Pendant, farm det kuki X ms i V fo Z DUHU LOCKA KK TK AAAH KAL KA 3 sho yah Mshcha OT 3 TV i shik : E IZ : 3 tok LK, OM YAN YAK I E x Z Be 13 m UK OK Y. x i 3 i 1 Ky KI Z i IZ i MEREV di i GY N yah MIA Ba NAI SHK U i i i i 3 g Zh TEO OVU IZ i IZ x po KK KOKO m i i i i i i U MZHK: U, Z and also He oku mAKAKALAKYUYUK ZhK MK z, zho ft ee in KO I Ban t. i r; self 7; YAM s- PT SCHE r. Kri spiny nn they nn Su Men GU y GU VNU y y koh y OO xx Х І : і Y ik I NN I : х Ох TK I і I У N х ZE (SAME TE і sl DAM АААААЛАКК ККУ ATAK АКААКААААТ КК КАК АААКАДКАААЙУМК УК АМАКААККХ ККУ ААААККХКАККХК КАХ иК КИ и ий i su t NK КИИ и и и T и и TE Я N Я «5 х, ЕЯ TE ХК VU и их sІ і В z KB Я Я N х i 7: with KE 5 hi ii ii . more; Z ia ME 2 ii ii ii I I ih ik t ii s h g ih VE ZH Z : Х и 5 I ZE ож х и 2 и и и KE : 3: 3 Э их СЯ : х TE: З: Э х - ; х 1: Ne : и и В 5 НЯ ке кон п в В В К п В в в в ZKU и и t : х ZKYA I и и и и te Z I schi 5 th vy y y NE SK NKU X y what poi reshe 1 KN t. same u oh y NE K YAN I kodi koi xx ME KN My na ee UM ХK EK E "Ky Zhlya EH Mkhzhksya t SET : KI Я и ЧИ У : Ех : М ХУ ЖЕК Ж : ЕЕ Я Я ЯKU и ЕХ Я Я З zi ЯKU : ЕВ 3 и ИК и TE : ИК : ЕЕ : о в о в вкы к ин к кажнх ke кл ovoVV сіня