JPH0634198Y2 - Brake device for electric loading vehicles - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a brake system for an electric cargo handling vehicle, particularly an electric forklift having a cargo handling mechanism or a power steering mechanism.

2. Description of the Related Art A drum type hydraulic brake is used as a conventional braking device for the electric forklift.

However, as electric forklift trucks become larger,
A large pedaling force is required for the brake pedal, and in order to obtain a powerful braking force with a small pedaling force, it is desired to use a hydraulic brake together with a braking booster as a braking assist device.

As such a braking booster, a vacuum-type booster mechanism in which a booster mechanism is integrated with a master cylinder,
There is a hydro master system or full power (hydraulic system) system in which the booster mechanism is separated from the master cylinder in a vacuum system. However, since the vacuum masterback method and the hydromaster method cannot use the suction negative pressure of the engine because they are electric, it is necessary to equip a vacuum pump, its motor, a vacuum tank, etc. to generate negative pressure. Therefore, it is necessary to set a new installation location for the electric forklift and there is a problem that the cost is significantly increased.

In view of the above demands and problems, an object of the present invention is to provide a brake device for an electric cargo handling vehicle that uses a full-power braking booster to solve the problems of installation location and cost. .

Means for Solving the Problems In order to solve the above problems, a brake device for an electric cargo handling vehicle of the present invention uses a switch operated by operating a brake pedal and a storage battery as a power generation source, and is driven by the operation of the switch. A motor, an oil pump for a cargo handling mechanism or a power steering mechanism driven by the motor, and a power brake booster for increasing the pressure of the oil supplied from the oil pump by operating the brake pedal and supplying the oil to a wheel cylinder. It is characterized by having and.

Operation With the above configuration, when the brake pedal is operated, the switch operates, the operation of this switch drives the motor, the drive of this motor drives the oil pump, the oil is supplied to the power brake booster, and the hydraulic pressure is increased. Supplied to the wheel cylinder. Therefore, a strong braking force can be obtained when the brake pedal has at least a stepping force.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a first view of a brake device for an electric cargo handling vehicle according to the present invention.
It is a block diagram which shows the Example of.

In FIG. 1, reference numeral 1 is a brake pedal, and the brake pedal 1 is supplied with oil by increasing the pressure of the oil supplied to the wheel cylinder 3 of the wheel 2 by operating (depressing) the brake pedal 1. A power brake booster 4 to be supplied and a micro switch 5 that is turned on by operating the brake pedal 1 are provided. Further, 6 is a cargo handling device, for example, a cargo handling motor composed of a two-field motor that drives the battery 7 as a power source by the operation of an operation switch (not shown) of the fork mechanism or the operation of the micro switch 5. When the motor 6 is driven, the cargo handling pump 8 is driven, and oil is supplied from the oil tank 9 to the control valve 10 of the cargo handling device. The control valve 10 divides the oil supplied from the cargo handling pump 8 into the power brake booster 4 and the cargo handling device with priority given to the power brake booster 4 side.
In FIG. 1, 11 indicates an oil filter.

The operation of the above configuration will be described.

When the brake pedal 1 is operated, the micro switch 5
When the micro switch 5 is turned on, the cargo handling motor 6 is driven, and the cargo handling pump 8 controls the control valve.
The oil flows to 10, and the oil split by the control valve 10 flows to the power brake booster 4, and the hydraulic pressure is increased to be supplied to the wheel cylinder 3 to operate the brake.

The cargo handling motor 6 operates one field for energy saving and low noise when the micro switch 5 is only on, and activates two fields (full power) at the same time or when the cargo handling device is operated.

By operating the brake pedal 1 in this way, the cargo handling pump 8 is driven and oil is supplied to the wheel cylinders 3, whereby the pedaling force of the brake pedal 1 can obtain at least a strong braking force. By using the cargo handling motor 6 and the cargo handling pump 8 which are equipped in the electric cargo handling vehicle, it is possible to reduce costs and reduce the number of locations.

Next, a second embodiment of the brake system for an electric cargo handling vehicle according to the present invention will be described with reference to the configuration diagram of FIG. The same components as those shown in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted.

In FIG. 2, 12 is a function of the power brake booster 4 of FIG. 1 and further includes a flow divider mechanism for dividing the oil supplied to the wheel cylinder 3 side into the wheel cylinder 3 and the power steering valve 13. It is a power brake booster. The oil shunted from this power brake booster 12 is supplied as oil for the power steering mechanism,
In accordance with the operation of 14, the power steering valve 13 drives the power steering cylinder 15 to perform steering. Further, 16 is driven by the battery 7 as a power source when the vehicle drive key (not shown) is turned on and the micro switch 5 is turned on or the shift lever (not shown) is operated forward or backward. This power steering motor is
The power steering pump 17 is driven by driving 16 and oil is supplied from the oil tank 9 to the power brake booster 12.

The operation of the above configuration will be described.

When the brake pedal 1 is operated, the micro switch 5
When the vehicle drive key is turned on by turning on the micro switch 5, the power steering motor 16 is driven, and oil flows from the power steering pump 17 to the power brake booster 12. This oil is diverted in the power brake booster 12, one of which is supplied to the power steering mechanism, and the other of which raises hydraulic pressure to be supplied to the wheel cylinders 3 to operate the brake.

By operating the brake pedal 1 in this way to drive the power steering pump 17 and supply oil to the wheel cylinders 3, the pedal force of the brake pedal 1 can obtain at least a strong braking force, and the electric By using the power steering motor 16 and the power steering pump 17 which are equipped in the automatic cargo handling vehicle, the cost can be reduced and the number of locations can be reduced.

As described above, according to the present invention, by operating the brake pedal, the oil pump is driven, the oil is supplied to the power brake booster, and the hydraulic pressure is increased to be supplied to the wheel cylinders. The pedaling force can obtain at least a strong braking force, and the cost can be reduced by using an oil pump for a cargo handling mechanism or a power steering mechanism mounted on a conventional electric cargo handling vehicle, The location can be reduced.

[Brief description of drawings]

FIG. 1 is a block diagram of a brake device for an electric cargo handling vehicle showing a first embodiment of the present invention, and FIG. 2 is a block diagram of a brake device for an electric cargo handling vehicle showing a second embodiment of the present invention. is there. 1 ... Brake pedal, 3 ... Wheel cylinder, 4 ...
… Power brake booster, 5… Micro switch,
6 ... cargo handling motor, 7 ... battery, 8 ... cargo handling pump, 12 ... power brake booster, 16 ... power steering motor, 17 ... power steering pump.

Claims (1)

[Scope of utility model registration request] 1. A switch that operates by operating a brake pedal, a motor that uses a storage battery as a power source and that is driven by the operation of the switch, and an oil pump for a cargo handling mechanism or a power steering mechanism that is driven by the motor. And a power brake booster for increasing the pressure of the oil supplied from the oil pump by operating the brake pedal and supplying the oil to the wheel cylinders, the brake device for an electric cargo handling vehicle.