JPS588466A - Dual handle steering device - Google Patents

Abstract

PURPOSE:To prevent an accident in training cars, by interposing a direction selector valve between a pair of lateral power steering devices and fluid pressure power source and operating one of the steering devices having priority through said valve. CONSTITUTION:A direction selector valve 17 of two-position selective type is provided between each fluid pressure power feed pipe line 14, 15 to a pair of lateral power steering devices 3, 4 and a pump 16 of fluid pressure power source. This selector valve 17 is selectively operated to feed pressure fluid from the pump 16 to one of the steering devices 3, 4. A flow divider valve 21 is interposed between the pump 16 and the valve 17, and low flow working fluid, divided by the flow divider valve 21, is guided to the steering device 3 at an instructor side via a pipe 22 as pilot pressure in a pilot valve 23. In case of emergency, if an instructor steers a handle, the pilot pressure in the pilot valve 23 is changed to operate the steering device 3 having priority.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides various vehicles with a steering wheel and a power steering device operated by the steering wheel on each of the left and right driver's seats. This invention relates to a double-handle steering device configured to allow steering operation.

For example, road work vehicles such as road sweepers need to be driven as far to the left as possible in order to clean the edges of the road, guardrails, etc. without interfering with the movement of other vehicles. However, if the steering wheel is located on the right side of the driver's seat like Tsuyoshi's vehicle, driving with the vehicle completely to the left requires considerable skill on the part of the driver4, and it also causes fatigue. The degree is also large.

Therefore, in such a road work vehicle, it is desirable to have a device in which steering handles are provided on both sides of the driver's seat so that the vehicle can be operated from the driver's seat on the right side of the vehicle, and from the driver's seat on the left side during road work. It is rare. Then, in 1983, a device using a dynamic steering system called power steering was introduced to install a dual-handle type steering wheel.
This has already been proposed in Report No. 9678, etc.

To put this simply, in this device, a manual lever or the like is used to switch between the power steering device attached to each of the left and right steering handles and the supply source that supplies working fluid to these devices. Interpose a controlled directional valve,? - The directional control valve is manually switched when necessary to supply working fluid only to the power steering device of the steering wheel helmet to be used. This simple structure has the advantage that only the necessary steering handle is connected to the steering link, and stable steering operations can be performed.

However, with the above-mentioned device, when changing the steerable steering wheel, manual switching of the directional control valve is always required, which results in a two-step steering operation, which not only makes the operation complicated; There was a problem in that it was easy to operate incorrectly.

Such operational problems are a major problem when the above-mentioned double-handle steering device 1l-1 is applied to a training vehicle (hereinafter referred to as a training vehicle) used at a driving training center. This is a problem, and it is desired to have a configuration that can solve this problem.

In other words, in the above-mentioned training vehicle, instead of the right driver's seat where the students sit, four steering handles are installed on the left driver's seat where the instructor sits so that steering operations can be performed from this side as well. This has great benefits and benefits in that instructors can assist inexperienced driving students with steering operations, prevent accidents such as collisions with other vehicles and obstacles, and teach students correct driving techniques. It is.

However, in the case of such a training vehicle, as mentioned above, it is necessary to operate a manual lever as a preparatory step before steering, which means that in an emergency when the instructor needs to steer There may be a time delay and you may not be able to make it in time. Therefore, with such a double-handle steering device 1, the instructor can perform a quick and reliable steering operation simply by steering the steering wheel, and the instructor can at this time overcome the steering wheel operation by the student. It is desirable to have a similar configuration, but in a dual configuration using a manually operated directional control valve as described above, if the switching operation is incomplete, the working fluid will be supplied to both power steering devices. This causes problems such as both steering wheels becoming distorted, making it impossible to properly steer the steering wheel. Also, while the axle was running, I performed a KWA switch operation. Risuto.

There is a risk of causing an accident46), so it is necessary to take this point t4 into consideration.

The present invention has been made in view of the above-mentioned circumstances.

A directional control valve is interposed between the left and right pair of power steering devices, the fluid pressure supply source, and zero, so that fluid pressure is normally supplied to one power steering device, and pilot pressure is guided to the other. Due to the simple structure in which the directional control valve is switched and controlled by the control means that is activated by the fluid pressure fluctuation of 1,000 degrees, the conventional manual switching operation of the directional control valve, which is troublesome and lacks reliability, is no longer necessary. Just by operating the steering wheel, the directional control valve is automatically switched and controlled, allowing for quick and reliable steering operation.It is used in training vehicles that prioritize one steering wheel operation. The object of the present invention is to provide a dual-handle steering device that can exhibit this effect.

Hereinafter, the present invention will be explained in detail using an example shown in the drawings.

Fig. 1 is a perspective view showing the schematic configuration of the following case in which the double-handle steering device according to the present invention is applied to a large axle tube such as a tractor. It is a fluid pressure circuit diagram of a simple example.

In Figure 1, the schematic configuration of the steering stirrup is shown in simple kW.
According to ltIA, reference numeral 1.2 is the left and right steering handles that distribute power to the left and right driver's seats of the vehicle (not shown).When using this as a training vehicle, the instructor uses the left steering plate handle 1,
The student operates the right steering wheel 2. 3.4 is a power steering device disposed on the lower end steel of the steering handles 1 and 2 at 1 m and 2 m, and inside the power steering device, fluid pressure flows in accordance with the steering direction of the steering handles 1 and 2, respectively. Control valve 11.11 (see Figure 2) for switching paths 10.
Power cylinder section 12 which is controlled by 11 and produces a steering assist force tube. 'ts (PJ (see Figure 2)) is provided. The output shafts of these dual-motor steering wt #3.4 each have pitman arms of 3 m.

4a, it is connected to a steering link mechanism that can rotate the left and right steering wheels (not shown) of the vehicle.

1k or 5m in Figure 1, @a welfare drug link.

lb, llb company Natstal Lure A, 5 (1, @ (1 kingpin), KV is 7-nt asstle, a is tie rod, Ia, Toh left and right knuckle spindles.

In the double-handle steering system having such a configuration, the fluid pressure circuits for the power steering devices 3.4 attached to the left and right steering handles 1.2 are as follows.

The tuna stone is composed as shown in Figure 2.

To explain this in detail, the relationship Kt! between each fluid pressure supply pipe line 14.15 to the pair of left and right dynamic power steering devices 3.4 and the pump 16 serving as the fluid pressure supply source! , a second switching type directional control valve 1T is interposed, and by switching this directional control valve IT, water is supplied from the tank 18 by the pump 16 via the eye-filling side pipe 19 and the discharge side pipe 20. The fluid pressure is configured to be supplied to either the left or right power steering device 3 or 4. The fluid pressure supply pipe line 1
4 Also, the fluid pressure supplied to the control valve 10 or 11 at Fi 15 is applied to the left and right cylinder chambers 12a, 12b, 13a, 11b, and its output is transmitted to the steering link mechanism to provide a steering assist force for turning the steered wheels.

Now, one feature of this embodiment is that in the circuit configuration described above, the pump 16 and the directional control valve 1
A diversion valve 21 is interposed between the diversion valve 21 and the low flow rate working fluid diverted by the diversion valve 21 and distributed as pilot pressure between the diversion valve 21 and the left fluid pressure supply pipe 14. It is guided through the pilot conduit 22 to the power steering port 3 on the left side, that is, on the instructor's side. The fluid pressure, which is normally supplied via the directional control valve 17Fi and the flow dividing valve 21, is set to be supplied to the power steering II electric motor 4 on the right student side.

That is, according to the present invention, while supplying the fluid pressure from the pump 11 to the student side as described above, a small amount of pressure is introduced to the instructor 11 so that the instructor IIl can operate the handle in an emergency. The directional control valve ITO switching control can be performed using the pressure control of the pilot pressure that increases when the directional switching valve ITO is operated.

As a specific example of controlling the directional switching valve 1T, in this embodiment, a pilot valve 23 is provided in the middle of the pilot pipe line 22, and its mechanical displacement causes the directional switching valve 1T & The structure is such that the fluid pressure from the pump 1@ is supplied to the instructor side.

To explain this in detail, the pilot valve 23 has a spool 24 that slides within the housing 23a, and a rod 241 extending from the spool 24 is connected to the directional control valve 17 side. and the above-mentioned Pisera)
EE is guided to the right ventricle 25 & of the spool 24, and the left i
i! A spring 26 is disposed within 25b.

Note that 2T is a small hole that opens the left ventricle (25 m) to the atmosphere, and a check valve 28 for preventing backflow is provided upstream of the pilot valve 23.

According to the configuration, power is normally supplied from the pump 10 to the right steering device 4 on the student's side via the OR body pressure directional switching valve 17, and the lever is controlled by operating the steering knob 2 on the right side. The power cylinder section 13 works to control the turning of the steered wheels by the steering link mechanism. At this time, the left steering wheel 1 on the instructor's side is idly rotated in accordance with the rotation from the right steering wheel 1 transmitted via the steering link mechanism. Mourning control valve 10 wire does not operate at all.

In such a state, when the student operates the WIAt 1 steering wheel and the instructor operates the left steering wheel 1 in an emergency where there is a danger of hitting an obstacle, the control valve 10 is actuated. However, the pilot pressure introduced increases accordingly. Then, due to this pressure fluctuation, the pressure in the right chamber 2Sa of the front pilot valve 23 becomes high, which causes the spool 24 to move to the left in the figure against the spring 26, and as a result, Then, the direction switching valve 17 is switched, fluid pressure is supplied to the left power steering device 3, and the steered wheels are controlled to turn by the output of the instructor's power cylinder section 12. At this time, fluid pressure is not supplied to the student 11.

IKa has no involvement in this student's steering wheel operation.

9. When the instructor stops operating the handle, the supply side pipe 14
Then, the fluid pressure in the pilot pipe 22 decreases, causing the spool 24 to move to the right in the figure, and as a result, the directional control valve IT is switched and fluid pressure is again supplied to the student side.

In addition, 30.31 in the figure is a return conduit for returning the working fluid from each power steering device 3.4 to the tank 18, and between this return conduit go, st and the above-mentioned supply side conduit 14.15. There are interposed check valves 32 and 33 which operate when the pump 169m breaks down.

Further, %34 is a filter provided in the suction side pipe line 1s of the pump 16, and a flow rate control unit 35, which is provided integrally with the butterfly pump 16, is further provided in the middle of the discharge side pipe line 20 of the pump 16. ing. This is to maintain the discharge flow rate from the pump 16, which is driven by an automobile engine or the like, to a constant value of 111 or less, so this can be explained simply as 2.
36 In the figure, an orifice 2 for detecting the flow rate in the water pipe 20, s
yh A flow control valve 38 is operated by this to supply a certain amount or more of working fluid to the tank 1111IKjl, and 38 is a relief valve connected downstream of the orifice 36 at the drain orifice 3111a.

Figure 3 shows another embodiment of the present invention, and parts that are the same as or correspond to those in Figure 2 are given the same numbers and their explanations will be omitted.

Let me briefly explain this and this example't! h. In place of the pilot valve 230 in the above-mentioned safe embodiment, a pressure switch 4 is used as a means for detecting pressure fluctuations of one pilot pressure.
0, and the electromagnetic directional control valve 41 between the left and right power steering ports 118, 4 and the pump 16 is switched and controlled by the electrical signal from the pressure switch 40. It should be noted that such a pressure switch 40 has been known in the past with various configurations, and any pressure switch 40 may be used as long as it can send out an electric signal in response to a change in pilot pressure.

42 in the figure is a power source, and even if the electromagnetic directional control valve 41 is controlled by such a pressure switch 40, it is impossible to achieve the same effect as the embodiment described above. be understood. Furthermore, the use of the pressure switch 40 has the advantage of being advantageous in terms of space, being inexpensive in terms of lighting costs, and having good responsiveness.

Further, according to the present invention, the diverter valve 21 that obtains the pilot pressure
Instead, a modification such as using the pump 1@ and a separate small-capacity pump 50 as shown in FIG. Since this is reliable and stable, pressure fluctuations can be detected reliably and switching control of the directional switching valve 17 and Fi 41 can be performed reliably. When an electromagnetic pump is used as such a small capacity pump 50, the configuration of each part is simplified.

Its advantages are huge.

Note that the double-handle rudder loss device with the above-mentioned configuration is
Needless to say, the present invention is not limited to cars, and can be applied to vehicles that require this type of dual-handle steering device, such as road cleaning vehicles. And, when using it for something other than a power training vehicle, there is a 9-key K that prevents accidental operation of the handle on the passenger seat side.

As described above, it is preferable to provide a control valve for cutting off the flow of pilot pressure in the pilot line 22, or to provide a release switch in the electric circuit from the pressure switch 40. According to the steering device, a directional switching valve is provided between a pair of left and right power steering devices and a fluid pressure supply source, pilot pressure is introduced to one of them, and the directional switching is performed by controlling the fluid pressure. Since the valve is controlled by switching, even though the configuration is ME, the fluid pressure flow path that is normally supplied to the other side can be automatically switched by forceful handle operation, quickly and reliably. This eliminates the need for manual switching of the directional control valve, which is troublesome and prone to erroneous operation as in the past.In particular, it is useful for training vehicles, etc., as it gives priority to forceful steering operation over the other side. It has excellent effects such as being effective when used in

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a schematic configuration of a double-handle steering stirrup according to the present invention, FIG. 2 is a fluid pressure circuit diagram showing an implementation IFiI of a fluid pressure circuit configuration featuring the same, and FIG. jl
FIG. 4 is an electric/fluid pressure circuit diagram showing another example of the inner MIi of the present invention. 1.2...Left and right steering handles, 3.4・4・°
... Left and right power steering devices, 10.11 ... Control, valves, 12.13 ... Power cylinder section. 14.15... Fluid pressure supply pipe line, 16... Pump (fluid pressure supply source), 1T... White direction switching valve, 18...
... Tank, 21 ... Diversion valve, 22 ... Pilot pipe line, 23 ... Pilot pulp %28 ...
...Reverse t) [,40...Pressure switch, 41...
・Solenoid directional valve, 50...Small capacity pump. Special pestle applicant: Jidosha Kiki Co., Ltd. Isuso Jidosha Co., Ltd. Agent Masaki Yamakawa (b, 1 person)

Claims (5)

[Claims] (1) There is a steering wheel on each of the left and right driver seats,
In addition, in a double-handle steering system that is configured to control turning of a common steering wheel by a pair of left and right power steering devices controlled by each steering wheel, a pair of power steering devices are connected to each other. A directional control valve inserted and connected between each fluid pressure supply pipe and the fluid pressure supply source, and pilot pressure is guided to one side of the power steering installation. and a control means for detecting fluid pressure fluctuations in the steering wheel and controlling the switching of the direction switching valve. (2) A dual-handle rudder according to claim 1, characterized in that the KiII is configured so that a pilot pulp is used as a control means in the pilot pipe and the directional switching valve is switched by mechanical displacement of the pilot pulp. Head device. (3) A pressure switch is provided as a control means in the high-lot pipe line, and the electromagnetic directional valve pipe switching is controlled by an electric signal from the pressure switch. Double-handle steering device as per FM ticket item 1. (4) What is the pilot pressure introduced into the pilot line? Claim 11 [, @Claim 2, Op. 9 is the cost of steering both steering wheels as described in paragraph 3. (5) Pilot pressure introduced into the high-lot conduit. Claims Nos. 1 and 2, and #2 and 3, characterized in that the fluid pressure supply source to each power steering installation is obtained by a small-capacity pump separate from the pump used. Double-handle steering device as described in section.