JPH0110301Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a power steering device for a dual-handle vehicle for training purposes.

Vehicles equipped with handles on both the left and right sides have been proposed to be installed on vehicles that need to be driven by pulling over to the left side of the road, such as road cleaning vehicles, but in this case, the handlebars on both the left and right sides of the vehicle have been proposed to be installed on vehicles that need to be driven close to the left side of the road. When working, the driver simply changes seats and controls the vehicle, and steering operations are performed from both seats at the same time, with no particular priority being given to operations on one side.

The purpose of this invention is to have a power steering device on both the left and right sides, so that both devices can be operated at the same time, but in the event of an emergency, the device on one side, that is, the instructor's seat, can be operated preferentially over the others. The purpose is to obtain a power steering device.

For this reason, the present invention provides a power steering device driven by separate hydraulic pressure sources for the student seat and the instructor seat, and a pressure switch is provided in the high pressure circuit of the power steering device for the instructor seat. The high pressure circuit of the power steering device for the student seat is provided with an electromagnetic switching valve that bypasses the high pressure circuit to the low pressure circuit, and the pressure switch operates the electromagnetic switching valve to open the bypass passage.

To explain the present invention based on an embodiment, as shown in FIG.
9, and the power steering device 3 is connected to the wheel 6 on one side (right side) via the link 5.
A pitman arm 4 is connected. In the power steering device 3, a hydraulic control valve is operated by rotation of a steering shaft 2 operated by a handle 1, and a hydraulic pump 2 is supplied to one end chamber of the power cylinder.
Pressure fluid is supplied from 2 through a conduit 23, and hydraulic fluid in the other end chamber is returned to the liquid tank 21 through a conduit 24. Similarly, a pitman arm 14 of a power steering device 13 is connected to the left wheel 6 via a link 15. This power steering device 13
The hydraulic pressure control valve is operated by the rotation of the steering shaft 12 operated by the handle 11 at the instructor's seat, and pressurized liquid is supplied to one end chamber of the power cylinder from the hydraulic pump 32 through the conduit 33. The liquid is returned from the other end chamber to the liquid tank 31 via a conduit 34. In this way, the left and right power steering devices 3 and 13 obtain hydraulic pressure from separate hydraulic pumps 22 and 32 to operate the power cylinders.

The present invention is designed to allow an instructor to prevent an accident by controlling the vehicle when an accident such as a collision or falling car is predicted due to the student's inexperience with driving. For this reason, an electromagnetic switching valve 36 is provided in the middle of the high-pressure circuit of the power steering device 3 in the student seat, that is, the conduit 23 that connects the hydraulic pump 22 and the inlet of the power steering device 3. The high voltage circuit of the power steering device in the instructor's seat
That is, a pressure switch 35 is provided in the middle of the conduit 33, and the electromagnetic switching valve 36 is operated by the pressure switch 35.

In the power steering system configured as described above, the electromagnetic switching valve 36 is normally in a state where the bypass conduit 37 is closed. Therefore, by rotating the steering shaft 2 with the handle 1, the student can switch the hydraulic pressure control valve of the power steering device 3.
Pressure fluid is supplied from the hydraulic pump 22 through a conduit 23 to one end chamber of the power cylinder, and transmits steering power to the wheels 6 via the pitman arm 4.
On the other hand, the liquid in the other end chamber of the power cylinder is
4 and is returned to the liquid tank 21. In this way, free training of the student is achieved.

In this case, the power steering device 13 at the instructor's seat is operated by the wheels 6.
The power is transmitted to the power cylinder of the power steering device 13 via the link 15 and the pitman arm 14, and the steering wheel 11 is rotated. That is, the power steering device 13 is driven by the power steering device 3 of the student seat by an external force from the wheels 6. Then, the pressure liquid from the hydraulic pump 32 enters the power cylinder of the power steering device 13 from the conduit 33, and the conduit 34
The liquid is then returned to the liquid tank 31. Since the power steering device 13 only follows the power steering device 3, the conduit 3
3 pressure is getting lower.

Emergency instructor turns the steering wheel 1 against the student's control.
1, the power steering device 13 is operated against the drag of the wheels 6. That is,
The power cylinder is loaded and the pressure in conduit 33 increases. When this pressure increases by a certain value (e.g. 20
Kg/cm), the pressure switch 35 operates, and the electromagnetic switching valve 36 is switched. That is, the electromagnetic switching valve 36
The conduit 23 and the bypass conduit 37 are communicated with each other, and the pressure of the hydraulic pump 22 is released to the liquid tank 21 via the bypass conduit 37, so that even if the student operates the steering wheel 1, the power steering device 3 does not generate steering power. Therefore, in this state, the handle 1 of the student's seat becomes heavy, and even if the student tries to forcefully operate it, it will be overcome by the steering power of the power steering device 13 operated by the instructor. In this way, in an emergency, the instructor's steering operation takes precedence over that of the student, and accidents can be avoided.

As mentioned above, the present invention arranges ready-made power steering devices independently in the left and right driver's seats, and connects a pressure switch to the high-pressure circuit of one device and connects the high-pressure circuit to the high-pressure circuit of the other device. Since the pressure switch is connected to the electromagnetic switching valve and the pressure switch is used to drive the electromagnetic switching valve, the entire device is easy to assemble, and in an emergency, the instructor can easily operate the handle. Since accidents can be avoided with priority, students can practice driving with peace of mind and have the effect of being able to acquire driving skills within a short period of time.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a power steering device for a dual-handle training vehicle according to the present invention. 1: Handle, 2: Steering shaft,
3: Power steering device, 4: Pitman arm, 5:
Link, 6: Wheel, 11: Handle, 12: Steering shaft, 13: Power steering device, 14:
Pittman arm, 15: link, 21: liquid tank,
22: Hydraulic pump, 23, 24: Conduit, 31: Liquid tank, 32: Hydraulic pump, 33, 34: Conduit, 3
5: Pressure switch, 36: Solenoid switching valve, 37: Bypass conduit.

Claims (1)

[Scope of utility model registration request] A power steering device driven by separate hydraulic pressure sources is provided for the student seat and the instructor seat, and a pressure switch is provided in the high pressure circuit of the power steering device for the instructor seat, and a power steering device for the student seat is provided. A power steering system for a dual-handle vehicle for training, wherein a high-pressure circuit of a control device is provided with an electromagnetic switching valve that bypasses the high-pressure circuit to a low-pressure circuit, and the pressure switch operates the electromagnetic switching valve to open a bypass passage. .