JP3018521U - Brake device for compaction machinery - Google Patents

Abstract

(57) [Summary] (Corrected) [Purpose] Highly safe rolling compaction machine with no fear that the vehicle will suddenly start even if the engine is started when the forward / reverse lever is tilted out of the neutral position. To provide a brake device for a vehicle. In a compaction machine including a hydraulic motors 4F, 4R for traveling a vehicle, a forward / reverse hydraulic pump 22 for driving the hydraulic motors, and a forward / backward lever for controlling a rotating direction and a rotating speed of the hydraulic pump, an engine is provided. A brake device in which the brake of the hydraulic motor is released to enable traveling when the forward / reverse lever is moved from the neutral position to the forward or reverse position at the time of starting.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a braking device for a rolling machine such as a tire roller or a road roller, and more particularly to a highly safe braking device that prevents a sudden start of a vehicle at engine start.

[0002]

[Prior art]

 A mechanical brake or a combination of an ON / OFF switch and a brake valve (solenoid valve) is generally used.

[0003]

[Problems to be solved by the device]

 According to the above-mentioned conventional technique, when the engine is started while the forward / backward lever is tilted to the forward or reverse position, the vehicle may suddenly start and the like.

It is an object of the present invention to provide a highly safe brake device for a compaction machine, which does not cause the vehicle to suddenly jump out even if the engine is started when the forward / reverse lever is tilted. It is a thing.

[0005]

[Means for Solving the Problems]

 In a closed circuit type hydraulic drive circuit that produces a hydrostatic brake when the hydraulic pump and hydraulic motor are stopped, an electric holding circuit with the following functions is provided: (a) When the forward / reverse lever is set to the neutral position, The relay is turned on by the power supply, the solenoid valve is turned on, and the brake of the hydraulic motor is released (the vehicle is stopped by the hydrostatic brake). (B) If the forward / reverse lever is moved to the forward or reverse position in (a) above, the power from the forward / reverse lever side will be cut off, but the relay will be kept ON by the power from the emergency brake side, and the solenoid The valve is kept ON and the brake of the hydraulic motor is kept in the released state. (C) When the emergency brake is activated, the power supply from the emergency brake side is cut off, the relay and solenoid valve are turned off, and the hydraulic motor brake is activated. (D) Even if the emergency brake is released in (c) above, the brake of the hydraulic motor continues to operate, and the brake of the hydraulic motor is released when the forward / reverse lever is returned to the neutral position.

[0006]

[Action]

 Even if the engine is instructed when the forward / reverse lever is tilted to the forward or reverse position, the relay and solenoid valve are held OFF, and the brake of the hydraulic motor is held in a controlled state, which prevents the vehicle from suddenly starting. Does not happen.

[0007]

【Example】

 An embodiment of the present invention will be described with reference to FIGS.

In the figure, 1 is a hydraulic oil tank, 2 is a charge pump, 3 is a solenoid valve, 4F is a front wheel hydraulic motor, 4R is a rear wheel hydraulic motor, 4FB is a front wheel brake, 4RB is a rear wheel brake, and 5 is an alternator. , 6 is a fuse box, 7 is a forward / reverse lever, 8 is a micro switch of the forward / backward lever 7, 10 is a relay, 9 is a barrier diode built in the relay 10, 11 is a push button type emergency brake, 12 is 2 Brake pilot lamp, 13 is a foot pedal type emergency brake, 14 is a battery, 15 is a battery switch, 16 is a starter motor, 17 is a battery relay, 18 is a starter switch, 19 is an ignition switch, 20 is hydraulic pipe for brake, 21 Is the main hydraulic piping, 22 is the swash plate axial piston piston Is a hydraulic pump that can control the discharge amount and the discharge direction of the hydraulic pump, 23 is a forward / reverse control valve, and 24 is an engine that drives the hydraulic pump 22.

In such a device, the hydraulic motors 4F, 4R are driven by the oil discharged from the hydraulic pump 22 driven by the engine 24. By operating the forward / reverse lever 7, the discharge direction and discharge amount of the hydraulic pump 22 are changed via the control valve 23. Therefore, by operating the forward / reverse lever 7, the rotational direction and rotational speed of the hydraulic motors 4F, 4R are controlled. it can.

When the forward / reverse lever is in the neutral position, the micro switch 8 is turned on and connected to the power source, the relay 10 is turned on, and the solenoid valve 3 moves to the right from the position shown in FIG. ), The hydraulic oil of the charge pump 2 is supplied to the brakes 4FB and 4RB via the hydraulic pipe 20 to release the brakes 4FB and 4RB.

When the forward / reverse lever 7 is set to the neutral position, the hydraulic pump 22 and the ports a and b of the hydraulic motors 4 F and 4 R are closed circuits, so the main hydraulic arrangement 21 is braked (hydrostatic brake). Therefore, the vehicle is kept stopped.

In this state, when the forward / reverse lever 7 is operated to the forward position or the reverse position, the power source of the micro switch 8 is cut off, but the relay 10 is energized via the emergency brakes 11 and 13 and is held by the holding circuit. The solenoid valve 3 is kept in the ON state, the brakes 4FB and 4RB are kept in the released state, and the vehicle can run.

Next, the holding circuit of the relay 10 will be described with reference to FIG. (1) When the forward / reverse lever 7 is set to the neutral position, the magnet 10M of the relay 10 is excited by the energization from the microswitch 8 and 10S is turned on, the magnet 3M of the solenoid valve 3 is excited, and the solenoid valve 3 moves to the right and turns on. (2) Once in the state of (1) above, even if the forward / reverse lever 7 is moved to the forward or reverse position to turn off the power of the micro switch 8, the power from the emergency brake 11 side is indicated by the arrow. Excites the magnet 10M of the relay 10 to keep the switch 10S in the ON state. (3) When the emergency brake 11 or 13 is pressed to turn off the switch 11S or 13S, the relay 10 and the solenoid valve 3 are not energized, the solenoid valve 3 is also turned off (the state shown in FIGS. 1 and 2), and the brake 4FB, 4RB is activated. (4) Even if the emergency brake 11 or the foot brake 13 is returned to the normal state (the switches 11S and 13S are ON) in the state of (3) above, the magnet 10M is demagnetized and the switch 10S is OFF. , Relay 10 does not turn on.

By moving the forward / backward lever to the neutral position, the magnet 10M of the relay 10 is excited and the switch 10S is turned on, the solenoid valve 3 is turned on, and the brakes 4FB and 4RB are released.

Therefore, when the emergency brake 11 or 13 is actuated during forward or reverse, these brakes 11 and 13 are returned to their original positions, and the forward-reverse lever 7 is once returned to the neutral position. It is possible to run again.

When the engine is stopped, the magnet 10S of the relay 10 is not energized, the relay 10 and the solenoid valve 3 are turned off, and the brakes 4FB and 4RB are operating. Therefore, even if the engine 24 is started with the forward / reverse lever moved to the forward or reverse position, the relay 10 and the solenoid valve 3 are not energized, the brakes 4 FB, 4RB are not released, and the forward / reverse lever 7 is neutralized. By returning to the position, the brakes 4FB and 4RB are released and the vehicle can run.

In this way, the sudden start of the vehicle when the engine is started is prevented.

[0018]

[Effect of device]

 The present invention includes a hydraulic motor for traveling a vehicle, a hydraulic pump that drives the hydraulic motor and can control the discharge amount and the discharge direction, and a main hydraulic pipe that connects the hydraulic motor and the hydraulic pump in a closed circuit. An always-operated brake installed on the hydraulic motor, a solenoid valve that releases or operates the brake by supplying or shutting off hydraulic oil, a relay that controls the solenoid valve, and the discharge amount of the hydraulic pump. A hydraulic pump (22) is driven in a brake device for a rolling machine, which comprises a forward / backward lever for controlling the discharge direction and an emergency brake for shutting off the solenoid valve to activate the brake of the hydraulic motor. If the forward / reverse lever (7) is set to the neutral position while the engine (24) is operating, the relay (10) will be energized from the side of the forward / reverse lever (7). When the relay (10) is turned on, the solenoid valve (3) is in the refueling position and the brakes (4FB, 4RB) are released, and then the forward / reverse lever (7) is set to the forward or reverse position, the forward / backward lever (7). The electricity from the side to the relay (10) is cut off, and the relay (10) is energized from the emergency brake (11, 13) side to keep the relay (10) ON and the brakes (4FB, 4RB) in the released state. When the emergency brakes (11, 13) are pressed, the electricity to the relay (10) and the solenoid valve (3) is all cut off and the brakes (4FB, 4RB) are activated, and the emergency brakes (11, 13) are activated. , 13) or after starting the engine (24), the forward / reverse lever (7) is temporarily returned to the neutral position and then moved to the forward or reverse position. Brake (4fb, 4 RBs) by becomes possible travel is released, it has the following advantages.

When the engine is started, the brake cannot be released unless the forward / reverse lever is once returned to the neutral position, so that a rapid start of the vehicle can be prevented.

In order to stop the vehicle during normal work, it is sufficient to move the forward / reverse lever to the neutral position and apply the hydrostatic brake without using a foot pedal brake or the like. Is good.

[Brief description of drawings]

FIG. 1 is a hydraulic circuit diagram of an embodiment of a brake device for a rolling machine of the present invention.

2 is a configuration diagram showing a holding circuit of the relay in FIG.

FIG. 3 is a hydraulic circuit diagram for driving a compaction machine used in the present invention.

[Explanation of symbols]

 3 Solenoid valve 4F, 4R Hydraulic motor 4FB, 4RB Brake 7 Forward / reverse lever 8 Micro switch 10 Relay 11, 13 Emergency brake

Claims (1)

[Scope of utility model registration request] 1. A hydraulic motor for running a vehicle, a hydraulic pump for controlling the discharge amount and the discharge direction for driving the hydraulic motor, and a main hydraulic pipe for connecting the hydraulic motor and the hydraulic pump in a closed circuit. A constant-action brake mounted on the hydraulic motor, a solenoid valve that releases or operates the brake by supplying or shutting off hydraulic oil, a relay that controls the solenoid valve, and a discharge amount and discharge of the hydraulic pump. In a brake system for a compacting machine, which comprises a forward / reverse lever for controlling a direction and an emergency brake for shutting off the solenoid valve to activate a brake of the hydraulic motor, an engine (24) for driving a hydraulic pump (22) is provided. If the forward / reverse lever (7) is set to the neutral position during operation, the relay (10) will be energized from the side of the forward / reverse lever (7). Relay (10) is turned ON the solenoid valve (3) refueling position and becomes a brake (4fb, 4 RBs) is released and placed in the forward or reverse position the forward-reverse lever (7) Thereafter,
Electricity from the forward / reverse lever (7) side to the relay (10) is cut off, the relay (10) is energized from the emergency brake (11, 13) side to keep the relay (10) ON, and the brakes (4FB, 4RB). When the emergency brakes (11, 13) are pressed, the electric power to the relay (10) and the solenoid valve (3) is cut off and the brakes (4FB, 4RB) are activated. ,
After actuating the emergency brakes (11, 13) or at the time of starting the engine (24), the forward / reverse lever (7) is temporarily returned to the neutral position and then moved to the forward or reverse position, whereby the brake (4FB, 4RB) is released to enable traveling, and a braking device for a compaction machine.