Device to change over mechanical gearbox of prime mover of road cleaning and maintaining machine which moves with operating mounted equipment

FIELD: road machinery.

SUBSTANCE: proposed machine contains prime mover with cab and engine 3 which is connected with mechanical gearbox 4 through clutch 5 provided with clutch release pedal 6. Power takeoff box 15 is mechanically coupled with gearbox 4. Mounted equipment is provided with power coupling with gearbox 4. Said coupling is made in form of hydraulic system including hydraulic pump 17 driven by power takeoff box 15. To change over gearbox 4 of prime mover clutch 5 is released by pressing on pedal 6. This breaks mechanical coupling between engine 3 and gearbox 4. Simultaneously with release of clutch 5, bracket of pedal 6 closes electric switch of hydraulic valve 20, and power coupling between gearbox 4 and mounted equipment is interrupted after change over of gears, pedal 6 is returned in upper position and clutch 5 is engaged. Simultaneously, bracket breaks contacts of electric switch, thus restoring power coupling between gearbox 4 and mounted equipment.

EFFECT: improved reliability of gearbox.

2 cl, 6 dwg

 

The invention relates to machines for cleaning and maintenance of road pavements.

The known method and device for switching transmission of the machine for cleaning and maintenance of road surfaces as it moves with working attachments, which contains the base car with the engine connected with the transmission changes gear through the clutch and attachments with force feedback with box changes gear through the PTO, with which it, in turn, is connected with the shaft for transmitting torque (Machines for harvesting cities and public buildings. Industrial directory of Createstream, pages 30-36, M., 1983). Before shifting off the clutch. When this force feedback of the mounted equipment is not terminated and the load of the work of the mounted equipment is transferred to box changes gear, creating difficulties when shifting gears.

The closest analogue or prototype of the present invention are a method and a device for switching transmission of the machine for cleaning and maintenance of road surfaces as it moves with working attachments, including the base car, the engine of which is connected with a manual transmission changes gear through the clutch associated with the pedal it off the treatment, attachments with force feedback with box changes gear, and the constant current source of electrical equipment basic car, with force feedback attachments with box changes gear is made in the form of a hydraulic system comprising a hydraulic pump, driven from the box PTO, kinematically associated with the transmission changes gears, and reported its suction cavity with a tank for the working fluid of the hydraulic system and the pressure cavity with hydraulic drive motors mounted equipment (Machines for harvesting cities and public buildings. Industrial directory of Createstream, p.36-43, M, 1983).

For gear with working attachments when driving off the clutch. In this case there is a power shaft gear box changes gear from the motor and, consequently, from the box of selection of power and associated hydraulic pump. At the same time, the load from the drive hydraulic motors mounted equipment creates resistance, which is transmitted through the hydraulic pump on the PTO and on the intermediate shaft gear box changes gears, stopping its rotation. However, because the basic movement of the vehicle continues by inertia, t and the rotation of the wheels is transmitted through the drive shaft to the secondary shaft of the change gear, that leads to a significant difference of the rotation speeds of the output shaft and the intermediate shaft, which is retarded by the resistance of the mounted equipment. The synchronizer gear box changes gear aligns the angular velocity of the secondary and intermediate shaft and the gear becomes significantly difficult or, as a rule, impossible.

The present invention is directed to solving the problem of enabling a normal switch box changes gear basic car machines for cleaning and maintenance of road surfaces as it moves with working attachments.

The technical result is achieved by the known method of switching a mechanical gear box changes gear basic car machines for cleaning and maintenance of road surfaces as it moves with working attachments, which has force feedback with box changes gears, namely, that before shifting off the clutch the engine basic car with box changes gears and simultaneously with turning off the clutch break the force feedback working attachments with box changes gears and restore the specified power connection after switching clutch vs the crime.

In addition, the known device for implementing the method of switching a mechanical gear box changes gear basic car machines for cleaning and maintenance of road surfaces as it moves with working attachments containing basic car machines for cleaning and maintenance of road pavements, the motor of which is connected with a manual transmission changes gear through the clutch associated with the pedal it off, attachments, having force feedback with box changes gear, and the constant current source of electrical equipment basic car, with force feedback attachments with box changes gear is made in the form of a hydraulic system comprising a hydraulic pump, driven from the box PTO, kinematically associated with the transmission changes gears, and reported its suction cavity with a tank for the working fluid of the hydraulic system and the pressure cavity with hydraulic drive motors mounted equipment, equipped with two-position hydraulic motor operated valve having an input and two outputs, with the valve inlet is in communication with the pressure cavity of the hydraulic pump, the first valve outlet in communication with the hydraulic drive motors operating equipment off electrodrive the e valve, the second output of which is communicated with a tank for fluid, an electric switch mounted with the opportunity to interact with the clutch pedal and having contacts which are opened when the position of the clutch pedal corresponding to the enabled state of the clutch, the actuator is a hydraulic valve connected to a source of DC electrical basic car through normally open contacts of the electromagnetic relay, the winding of which is connected in series with a DC source of electrical equipment basic car through the contacts of the electrical switch. In addition, the device is equipped with a hydraulic accumulator connected to the first output of the hydraulic valve.

Before shifting off the clutch pedal, which disables the primary shaft gear box changes gear from the motor base car. Simultaneously, the closed contacts of the electrical switch and the voltage from the DC source of electrical equipment basic vehicle is supplied to the relay coil. Relay is activated and closes normally open contacts, which ensures the supply to the hydraulic actuator valve voltage from the DC source of electrical equipment b the basic car. In the hydraulic valve switches and the flow of the working fluid from the pressure cavity of the hydraulic pump through the second outlet valve is supplied directly to the tank for the hydraulic fluid. This ensures that the gap of the power connection between the gearbox changes gears and working implements. Resistance to direct the overflow fluid from the hydraulic pump to the tank is negligible, which leads to a sharp drop in pressure of the working fluid and full discharge of the hydraulic pump and associated gearbox PTO and the intermediate shaft gear box changes gear. Synchronization of the angular velocities of rotation of the secondary shaft, caused by the continuing inertia of the rotation of the wheels, and the intermediate shaft, which is not halted due to the rupture force feedback, in this case, normally, than is provided by normal gear box changes gear. After switching the gearbox pedal include the clutch and taking place simultaneously, the break contacts of the electrical switch provides off electric hydraulic valve and restore power hydraulic connection between the gearbox changes gear and the drive hydraulic motors mounted equipment. The compensation for the lack of feeding slave is whose fluid under pressure from hydraulic pump drive hydraulic motors attached equipment when switched off, the clutch provides a hydraulic accumulator.

The invention is illustrated by drawings, showing

figure 1 - machine for cleaning and maintenance of road pavements, side view;

figure 2 - callout A, 1;

figure 3 - callout B in figure 1 axonometric projection;

4 is a kinematic diagram;

5 is a hydraulic circuit diagram;

6 is an electrical diagram.

Machine for cleaning and maintenance of road pavements contains basic car 1 cab 2, a motor 3, which is connected with a manual transmission changes gears (hereinafter CAT) 4 through the clutch 5, which is connected with the pedal 6 clutch installed in the cab 2. The base vehicle 1 is driving wheels 7, which are connected via a cardan shaft 8 with the secondary shaft 9 of the transmission 4. Attachments of the machine comprises a hopper 10 of the spreader deicing materials from conveyor 11 and spreading disk 12. In addition, attachments may contain brush 13 for cleaning road surfaces. Basic car 1 contains the electrical equipment, which includes a constant current source is a battery 14. With CAT 4 kinematically linked PTO (hereinafter KΩ) 15. Attachments has a power connection with the transmission 4, which is made in the form of a hydraulic system 16, which includes a hydraulic pump 17 driven from 15 KΩ. Hydraulic N. the SOS 17 reported its suction cavity with a tank 18 for the working fluid, mounted on the base vehicle 1. The pressure cavity of the hydraulic pump 17 is connected by pipeline to the input 19 of the hydraulic valve 20, which has the actuator 21. The first outlet 22 of the valve 20 is communicated when the actuator 21 with the hydraulic motors 23, 24 and 25 of the drive units mounted equipment: brush 13, the conveyor 11 and the spreading of the disk 12. The second output 26 of the hydraulic valve 20 is communicated with the tank 18 to the working fluid. In the cockpit 2 is an electric switch 27, which is mounted with the ability to interact with pedal 6 off clutch 5 through a bracket 28 fixed on the pedal 6. The electric switch 27 includes the contacts S1, which are open at the top position of the pedal 6, the corresponding enabled the clutch 5, i.e. in the interaction with the bracket 28, and closed when the clutch 5 in the lower pedal position 6. The actuator 21 of the hydraulic valve 20 is connected to the battery 14 (6) through normally open contacts S1 of the relay 29, the winding of which is connected to the battery 14 through the contacts S2 electric switch 27. Checkpoint 4 contains the primary shaft 30 (figure 4)connected to the clutch 5, the intermediate shaft 31 with the gear 32 of constant mesh with which is engaged paras the percentage gear 33 KΩ 15. To the shaft driven gear 34 KΩ 15 attached to the shaft of the hydraulic pump 17. The hydraulic system includes a hydraulic accumulator 35, which is connected to the first outlet 22 of the hydraulic valve 20.

When the movement of the base vehicle 1 machine for cleaning and maintenance of road surfaces during technological operations, such as sweeping pavement or distribution of anti-icing agents, hydraulic pump 17 driven from WHOM 15 through the gate 4, provides a power connection between the mounted equipment and the transmission 4, directing the working fluid under pressure from the tank 18 through the hydraulic valve 20 to the hydraulic motor 23 to drive the brush (sweeping) or hydraulic motors 24 and 25 of the drive of the conveyor 11 and disk 12 (in the distribution of deicing materials), making it necessary to rotate these motors.

To switch checkpoint 4 basic car 1 when driving with working attachments brush 13 (when sweeping the road surface or conveyor 11 and spreading disk 12 (when the distribution on the road surface deicing materials) pedal 6 off clutch 5. When this is broken the kinematic connection between the motor 3 and the transmission 4. The drive shaft 30 is stopped, and the secondary shaft 9 continues to rotate the rotation of the driving wheels 7, which is passed on in origny shaft 9 through the drive shaft 8. Through the gear 32 constant-mesh, this rotation is transmitted to the intermediate shaft 31 and parasitic gear 33 KΩ 15. Through the driven gear 34, the rotation is transmitted to the shaft of the hydraulic pump 17, which pumps the working fluid under pressure to the hydraulic motor 23 to drive the brush or hydraulic motors 24 and 25 of the drive of the conveyor 11 and the spreading of the disk 12. Simultaneously with the turning off of the clutch 5 pedal 6 is the electric release switch 27 from the effects of the bracket 28 and the contacts S2 electric switch 27 is closed. Electric current from the battery 14 formed on the electric circuit is supplied to the relay coil 29, the contacts of which S1 is closed and the battery 14 is connected to the actuator 21 of the hydraulic valve 20. Upon actuation of the actuator 21 of the hydraulic valve 20 is switched and its input 19, and therefore, the hydraulic pump 17 is communicated via the second output 26 to the tank 18. The working fluid ceases to flow to the hydraulic motor 23 or 24 and 25, resulting in reduced almost to zero load on WHOM 14 and the transmission 4 from the hydraulic pump 17, i.e. breaks the power connection between the transmission 4 and attachments. The hydraulic motors 23 or hydraulic motors 24 and 25 continues to rotate, as they entered the working fluid from the hydraulic accumulator 35, nakopleno is it during normal operation of equipment. In the absence of braking effort on the intermediate shaft 31 of the transmission 4 it synchronizers ensure proper alignment of the angular velocity of rotation of the intermediate shaft 31 and the output shaft 9, which ensures the normal gear transmission 4. After the gear shift pedal 6 is returned to its upper position in which the clutch 5 is included. Simultaneously, the bracket 28 acts on the electric switch 27, the contacts S1 which is open. This leads to de-energize the actuator 21 of the hydraulic valve 20 and it switches to a position in which its inlet 19 and the outlet 22 report of the hydraulic pump 17 with the hydraulic motors 23, 24 and 25 of the drive mounted equipment. This restores the power relationship between the transmission 4 and attachments. The work of the mounted equipment proceeds normally.

1. Device for switching mechanical gear box changes gear basic car machines for cleaning and maintenance of road surfaces as it moves with working attachments, the motor of which is connected with a manual transmission changes gear through the clutch associated with the pedal it off, attachments, having force feedback with box changes gear, and the constant current source of electrical equipment base and the car when this force feedback attachments with box changes gear is made in the form of a hydraulic system comprising a hydraulic pump, driven from the box PTO, kinematically associated with the transmission changes gears, and reported its suction cavity with a tank for the working fluid of the hydraulic system and the pressure cavity with hydraulic drive motors mounted equipment, characterized in that it is provided with a two-position hydraulic motor operated valve having an input and two outputs, with the valve inlet is in communication with the pressure cavity of the hydraulic pump, the first valve outlet in communication with the hydraulic motors drive the working equipment is switched off when the drive valve, the second output of which is communicated with a tank for fluid, an electric switch mounted with the opportunity to interact with the clutch pedal and having contacts which are opened when the position of the clutch pedal corresponding to the enabled state of the clutch, the actuator is a hydraulic valve connected to a source of DC electrical basic car through normally open contacts of the electromagnetic relay, the winding of which is connected in series with the DC power source e is oborudovanie base of the vehicle through the electric contacts of the switch.

2. The device according to claim 1, characterized in that it is equipped with a hydraulic accumulator connected to the first output of the hydraulic valve.



 

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