CN107472230B - Braking system of a hydraulically driven road roller - Google Patents

Abstract

The invention discloses a hydraulic drive road roller braking system which comprises an emergency braking switch (1), a front wheel gear shifting switch (2), a handle neutral position detection switch (3), a rear wheel gear shifting switch (4), a brake detection switch (5), a parking braking switch (6), an engine ECU (7), a front wheel gear shifting relay (8), a rear wheel gear shifting relay (9), a foot braking relay (10), a front wheel gear shifting valve (11), a rear wheel gear shifting valve (12), a pump swashplate centering valve (13) and a braking valve (14). The hydraulic driving road roller braking system provided by the invention is provided with the secondary service braking, so that the service braking distance is reduced; the parking brake and the emergency brake are independently separated, and the function definition is clear; the emergency brake switch cuts off all output control signals of the whole machine.

Description

Braking system of a hydraulically driven road roller

technical field

The invention relates to a braking system, in particular to a hydraulically driven road roller braking system.

Background technique

Road rollers belong to the category of compaction equipment in construction machinery, and can be divided into mechanical drive, hydraulic drive and other types according to the driving principle. At present, in the braking device of the hydraulically driven road roller, the service braking is mainly through the handle being returned to the center, the drive pump has no hydraulic oil output, and the road roller decelerates until it stops. When the road roller is running at a relatively high speed, the braking distance is long and the safety and reliability are poor. Currently In the braking device of hydraulically driven rollers, there is a common switch for emergency brake and parking brake. The function definition is confusing, which is easy to cause misoperation, resulting in damage to the drive axle and reducer, and the emergency brake switch is not completely powered off. It is easy to cause damage to the roller parts.

Contents of the invention

The technical problem to be solved by the present invention is to provide a hydraulically driven road roller braking system, which can effectively reduce the driving braking distance of the road roller and improve driving safety; further, the parking brake and emergency brake are separated independently, and the functions are defined It is clear to prevent misoperation; further, the emergency brake switch is completely powered off, which can cut off all output control signals of the whole machine.

In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:

A brake system for a hydraulically driven road roller, comprising an emergency brake switch, the emergency brake switch is respectively connected with the front wheel shift switch, the handle neutral position detection switch, the rear wheel shift switch, the brake detection switch and the engine ECU, the The front wheel shift switch and the rear wheel shift switch are respectively connected to the 30 ends of the front wheel shift relay and the rear wheel shift relay, and the front wheel shift relay and the rear wheel shift relay are respectively connected to the front wheel shift valve It is connected with the rear wheel shift valve, the handle neutral detection switch is connected with the 85 end of the front wheel shift relay and the rear wheel shift relay respectively, and the handle middle detection switch is connected with the 75 end of the engine ECU. connected, the brake detection switch is connected with the 85 end of the foot brake relay and the 55 end of the connected engine ECU respectively, the 87a end of the foot brake relay is connected with the pump swash plate return valve, and the 30a end of the foot brake relay The terminal is connected with the emergency brake switch.

The emergency brake switch and the parking brake switch are normally closed switches.

The front wheel shift relay, the rear wheel shift relay and the foot brake relay are normally closed relays.

The front wheel shift switch, the handle neutral detection switch, the rear wheel shift switch and the brake detection switch are normally open switches.

The emergency brake switch is externally connected to a 24V power supply to supply power to the entire system.

The emergency brake switch is connected with the parking brake switch, and the parking brake switch is connected with the brake valve.

The beneficial effects of the present invention are:

First, it is equipped with two levels of service brakes. Each level of service brakes greatly reduces the braking distance and greatly improves the safety of the road roller's service brakes.

Second, the parking brake and emergency brake are separated independently, and the functions are clearly defined to prevent misuse from causing damage to the drive axle and reducer.

Third, after emergency braking, the engine can be turned off in an emergency, all output control signals of the whole machine can be cut off, the components of the road roller can be effectively protected, and the braking safety and reliability of the road roller can be greatly improved.

Description of drawings

Fig. 1 is a schematic diagram of connection relationship of a braking system of a hydraulically driven road roller according to the present invention.

The meanings of the symbols in the accompanying drawings are as follows: 1. Emergency brake switch, 2. Front wheel shift switch, 3. Handle neutral detection switch, 4. Rear wheel shift switch, 5. Brake detection switch, 6. Parking brake Switch, 7. Engine ECU, 8. Front wheel shift relay, 9. Rear wheel shift relay, 10. Foot brake relay, 11. Front wheel shift valve, 12. Rear wheel shift valve, 13. Pump swash plate Back to center valve, 14, brake valve.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

As shown in Figure 1, a brake system for a hydraulically driven road roller consists of an emergency brake switch 1, a front wheel shift switch 2, a handle neutral position detection switch 3, a rear wheel shift switch 4, a brake detection switch 5, a parking Brake switch 6, engine ECU 7 (ECU Electronic Control Unit: electronic control unit), front wheel shift relay 8, rear wheel shift relay 9, foot brake relay 10, front wheel shift valve 11, rear wheel shift valve 12 , The pump swash plate returns to the middle valve 13, and the brake valve 14 is formed.

Among them, the emergency brake switch 1 is respectively connected with the front wheel shift switch 2, the handle neutral position detection switch 3, the rear wheel shift switch 4, the brake detection switch 5, the parking brake switch 6 and the engine ECU7, and the front wheel shift switch The switch 2 and the rear wheel shift switch 4 are connected to the 30 ends of the front wheel shift relay 8 and the rear wheel shift relay 9 respectively. The front wheel shift relay 8 and the rear wheel shift relay 9 are respectively connected with the front wheel shift valve 11 and the rear wheel shift valve 12, and the handle neutral detection switch 3 is connected with the front wheel shift relay 8 and the rear wheel shift relay respectively. The 85 ends of 9 are connected, and the handle middle position detection switch 3 is connected with the 75 ends of the engine ECU7. The brake detection switch 5 is connected to the 85 end of the foot brake relay 10 and the 55 end of the engine ECU7 respectively, and the 87a end of the foot brake relay 10 is connected to the middle valve 13 of the pump swash plate. The 30 end of the foot brake relay 10 is connected with the emergency brake switch 1 . The parking brake switch 6 is connected to a brake valve 14 .

When the control handle returns to the center, the road roller realizes the first level of service braking, the handle neutral position detection switch 3 is closed, no matter whether the front wheel shift switch 2 or the rear wheel shift switch 4 is closed or disconnected, the front wheel shift relay 8 The 85 end of the rear wheel shift relay 9 gets the electric signal of the middle position detection switch 3 of the handle, and the front wheel shift relay 8 and the 87a end of the rear wheel shift relay 9 cut off the front wheel shift valve 11 and the rear wheel shift valve. 12 power supply, the front and rear wheel drive motors change from small displacement to large displacement. At the same time, the 75 end of the engine ECU 7 receives the closing signal of the handle neutral position detection switch 3, and controls the engine speed to drop to the set idle speed value. During the first-level service braking process of the road roller, since the engine speed drops to the set idle speed value, and the front and rear wheel motors change from small displacement to large displacement, the deceleration slope becomes larger during the shutdown process of the road roller, reducing the Road roller braking distance.

When the foot brake is stepped on, the road roller realizes the second level of service braking, the brake detection switch 5 is closed, the 85 end of the foot brake relay 10 receives the electrical signal that the brake detection switch 5 is closed, and the 87a end of the foot brake relay 10 cuts off the pump swash plate and returns to the center. The power supply of valve 13, the pump swash plate is returned to the center, and the hydraulic power source is cut off. At the same time, the terminal 55 of the engine ECU 7 receives the closing signal of the brake detection switch 5, and controls the engine speed to drop to the set idle speed value. When the two brakes are operated together, the driving braking distance can be greatly reduced, and the safety and reliability of the road roller's driving braking can be improved. The second level of driving braking can also be operated independently. After the driving brake, the control handle should be returned to the neutral position in time. .

When the road roller stops at rest on a slope or on a level road surface, the parking brake switch 6 is pressed, the power supply of the brake valve 14 is cut off, and the brake of the whole vehicle is locked, so that the parking brake can be realized.

When the road roller encounters an unexpected situation while driving, the emergency brake switch 1 can be pressed. Since the emergency brake switch 1 controls the total power supply of the braking system, the entire braking system will be powered off at this time, which can realize emergency braking of the whole vehicle. Braking, pressing the emergency brake switch 1 can control the engine to stop in an emergency, cut off all output control signals of the whole system, better protect the safety of the parts of the whole machine, and greatly improve the safety and reliability of the road roller's braking .

The invention is equipped with two-stage service brakes, which greatly reduces the service brake distance, and the two-stage service brakes can be operated in coordination or independently, thereby improving the safety of the service brakes of the road roller. The parking brake and emergency brake are separated independently, and the functions are clearly defined to prevent misuse from causing damage to the drive axle and reducer. After the emergency braking operation, the engine can be turned off in an emergency, all output control signals of the entire system can be cut off, the components of the road roller can be effectively protected, and the braking safety and reliability of the road roller can be greatly improved.

The brake system of the hydraulically driven road roller of the present invention has compact structure, convenient installation and reliable performance, and greatly improves the safety and reliability of the brake of the road roller.

The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the description of the present invention and the contents of the accompanying drawings, or directly or indirectly used in other related technical fields , are all included in the scope of patent protection of the present invention in the same way.

Claims (6)

1. A brake system for a hydraulically driven road roller, characterized in that it includes an emergency brake switch (1), which is connected to the front wheel shift switch (2) and the handle neutral position detection switch ( 3), the rear wheel shift switch (4), the brake detection switch (5) are connected to the engine ECU (7), the front wheel shift switch (2) and the rear wheel shift switch (4) are respectively connected to the front wheel shift switch Gear relay (8) is connected to terminal 30 of rear wheel gear shift relay (9), and said front wheel gear shift relay (8) and rear wheel gear shift relay (9) are respectively connected with front wheel gear shift valve (11) and rear wheel The wheel shift valve (12) is connected, the handle middle position detection switch (3) is respectively connected with the 85 terminals of the front wheel shift relay (8) and the rear wheel shift relay (9), and the handle middle position The detection switch (3) is connected to terminal 75 of the engine ECU (7), and the brake detection switch (5) is respectively connected to terminal 85 of the foot brake relay (10) and terminal 55 of the connected engine ECU (7). End 87a of the foot brake relay (10) is connected to the pump swash plate return valve (13), and end 30 of the foot brake relay (10) is connected to the emergency brake switch (1). 2. The braking system of a hydraulically driven road roller according to claim 1, characterized in that: the emergency brake switch (1) and the parking brake switch (6) are normally closed switches. 3. A braking system for a hydraulically driven road roller according to claim 1, characterized in that: the front wheel shift relay (8), the rear wheel shift relay (9) and the foot brake relay (10) are normally closed relay. 4. The brake system of a hydraulically driven road roller according to claim 1, characterized in that: the front wheel shift switch (2), the handle neutral position detection switch (3), and the rear wheel shift switch (4) and brake detection switch (5) are normally open switches. 5. The brake system of a hydraulically driven road roller according to claim 1, characterized in that: the emergency brake switch (1) is externally connected to a 24V power supply to supply power for the entire system. 6. The brake system of a hydraulically driven road roller according to claim 1, characterized in that: the emergency brake switch (1) is connected to the parking brake switch (6), and the parking brake switch ( 6) Connect with brake valve (14).

Images