JPH088953Y2 - Control device for raising cab - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a driver's cab lifting operation device in a cab-over type automobile or the like.

[Prior Art] Conventionally, a cab-over type automobile or the like having an engine provided in a lower portion of a driver's cab is provided with a driver's cab lifting device for inspecting or repairing the engine. is there.

The basic structure of such a driver's cab lifting device is as shown in FIG. 4, and a hydraulic actuator 8 is provided between the driver's cab 7 and the chassis 6, and The piston 8a is connected to the cab 7, and the cylinder portion of the hydraulic actuator 8 is the chassis 6
Is connected to.

The operation of the above basic structure is as follows.

In FIG. 4, the driver's cab 7 is initially set in a normal traveling state on the chassis 6, and when the operator's cab 7 is lifted as shown in FIG. 4 in the above engine inspection or repair, the hydraulic pump 4a is used. Is driven by the electric motor 4, the switching position of the switching valve 5 is set to 5A.

Then, the pressure oil discharged from the hydraulic pump 4a from the hydraulic pipe 4b is pressure-fed to the hydraulic actuator 8 via the switching position 5A, whereby the hydraulic actuator 8 pushes up the piston 8a and pushes it up. Lifts the cab 7 as shown.

In this way, the hydraulic oil displaced by the piston 8a in the hydraulic actuator 8 due to the pushing up is discharged to the reservoir 4d via the switching position 5A and the conduit 4c.

On the contrary, when the driver's cab 7 is lowered onto the chassis 6 from the state in which the driver's cab 7 is lifted as shown in the figure, the hydraulic pump 4 a is driven by the electric motor 4. Set the switching position of switching valve 5 to 5C.

Then, the pressure oil discharged from the hydraulic pump 4a from the hydraulic conduit 4b is pressure-fed to the hydraulic actuator 8 via the switching position 5C, which causes the hydraulic actuator 8 to push down the piston 8a, and the lowering thereof The platform 7 is lowered onto the chassis 6.

In this way, the hydraulic oil displaced by the piston 8a in the hydraulic actuator 8 due to the lowering is discharged to the reservoir 4d via the switching position 5C and the conduit 4c.

Further, when the driver's cab 7 is set on the chassis 6 and the vehicle is being driven, or when the driver's cab 7 is lifted to an intermediate position and fixed at that position, the switching position of the switching valve 5 is changed. Set to 5B. That is, the discharge hydraulic pipeline 4b of the hydraulic pump 4a is opened to the reservoir 4d via the switching position 5B and the hydraulic pipeline 4c, the hydraulic pipeline to the hydraulic actuator 8 is closed at the switching position 5B, and the piston 8a is fluidized. Is restrained in that position.

In this case, the cab 7 is pivotally attached (not shown) to a part of the chassis 6 in front of the cab 7. Therefore, when the piston 8a pushes up the cab 7, as shown in FIG. 7 is in a state of being lifted in a state of being inclined forward.

In the basic configuration as described above, the operation in the conventional cab lifting device is performed manually first before operating the switching valve 5 with the switching valve 5 set to the neutral position of the switching position 5B. Turn on the power switch of the electric motor 4 to keep the hydraulic pump 4a in the operating state, and then switch the switching valve 5
Was switched to the switching position 5A or 5C to raise or lower the cab 7.

[Problems to be Solved by the Invention] However, in the conventional operation for lifting the cab, the power switch of the electric motor 4 and the switching valve 5 must be individually operated each time the operation is performed. Is inconvenient.

Furthermore, for example, when lifting the cab 7, the switching valve 5
If the power switch of the electric motor 4 is turned on while the switch position 5C for lowering the cab 7 is set, there is a risk of causing a malfunction such that the cab 7 is lowered at the same time when the switch is turned on. there were.

An object of the present invention is to provide a cab-lifting operation device that eliminates the above-mentioned inconvenience in operation.

[Characteristics for Solving the Problems] The hydraulic actuator provided between the driver's cab and the chassis is provided with a hydraulic line from a hydraulic pump driven by an electric motor. In a cab lifting device equipped with a hydraulic switching valve that switches the hydraulic pipeline in the direction in which the hydraulic actuator expands or contracts, a: The switching of the hydraulic switching valve is a lever operation that swings around a fulcrum. It is linked to the switching operation. That is, the interlocking operation enables the hydraulic switching valve to switch the hydraulic line in the direction in which the hydraulic actuator expands or contracts.

Further, b: The first feature is that an oscillating member is provided between the electric motor and the power source, the oscillating member for turning on and off by moving to one side and returning to the other side.

c: Further, the lever has a first protrusion on the operating grip side of the lever centered on the fulcrum, and a second protrusion on the opposite side of the operating grip centered on the fulcrum. The second characteristic is the point.

d: The oscillating member is operated to the one side by the first protrusion at a position where the lever is operated to one side end, and the switch is turned on.

Conversely, when the lever is operated to the other side end, the second protrusion is fixed to the opposite side to the first protrusion, so that the operation setting to the other side end of the lever is made. In the case of
It becomes possible to turn on the switch by urging the oscillating member to one side.

That is, if the lever is set to one side end by operating one lever, the switch of the electric motor is turned on, and the hydraulic switching valve can be switched in the direction in which the hydraulic actuator extends in conjunction with the lever. On the contrary, if the lever is set to the other side end, the switch of the electric motor is turned on, and the hydraulic pressure switching valve can be switched in the direction in which the hydraulic actuator contracts in conjunction with the lever.

[Embodiment] The present invention will be described below based on an embodiment.

FIG. 1 is a system diagram showing a driver's cab lifting operation device as an embodiment of the present invention. The lever 1 swings in the direction of arrow a or b with the shaft center of the shaft 1d as a fulcrum. The lever 1 has the first protrusion 1a fixed to the grip 1g side, and the extension 1b fixed to the lever 1 has the second protrusion 1c fixed thereto.

A link 1e is fixedly mounted on a shaft 1d which is rotated by the swing of the lever 1, and the switch valve 5 is moved to any of the switch positions 5A, 5B or 5C by swinging the link 1e in the direction of arrow c or d. The relationship is set.

Also in the present invention, the basic structure of the cab lifting device is the same as that shown in FIG. 4 described above, and the electric motor 4 and the switching valve 5 in FIG. 4 are the same materials as the electric motor 4 and the switching valve 5 in FIG. Yes, the pusher 3a of the power switch 3 of the electric motor 4 in FIG. 1 is turned on in a state of being urged to the right of the paper surface of FIG. 1, that is, is set to an on state, and its urging force is set. When is disappeared, the switch is turned off, that is, turned off, by the returning force of the spring provided inside.

The rocking member 2 is pivotally supported on the pin 2a and can rock around the pin 2a.

 The operation of the above configuration will be described below.

Normally, the driver's cab 7 shown in FIG. 4 is set on the chassis 6 so that the vehicle can run.

The illustrated state of the driver's cab lifting operation device in FIG. 1 shows a state in which the lever 1 is set to the neutral position in the travelable state of the vehicle, and the lever 1 in that state is shown.
Is suspended in the detent 1f, and the link 1e in its neutral position sets the switching valve 5 to the switching position 5B.

As a result, the hydraulic line from the hydraulic actuator 8 in FIG. 1 is closed at the switching position 5B, and the hydraulic line 4b is opened to the reservoir 4d via the hydraulic line 4c.

Further, in the state shown in FIG. 1, the switch 3 is such that the pusher 3a is moved by the oscillating member 2 by the biasing force of the spring provided therein.
Is pushed back to the left, and the switch 3 is set to the off state. Therefore, the electric motor 4 is not driven and the hydraulic pump 4a is not operating.

When the operator's cab 7 is set on the chassis 6 and the lever 1 is set to the neutral position, the operator's cab 7 is lifted for engine inspection or repair as shown in FIG. In, the lever 1 is operated in the direction of the arrow a to set the setting position of the lever 1 to the position shown in FIG.

When the lever 1 is set in the state shown in FIG. 2, the protrusion 1a biases the rocking member 2 to the right in FIG. 2, whereby the rocking member 2 moves about the pin 2a as a fulcrum. The pusher 3a of the switch 3 is biased to the right by rotating in the direction of the arrow in the figure, and the switch 3 is set to the ON state.

At the same time as this action, when the lever 1 is set to the state shown in FIG. 2, the shaft 1d fixed to the lever 1 is rotated in the direction of the arrow d by the lever operation, and the link 1e fixed to the shaft 1d is moved. Set the switching valve 5 to the switching position 5A.

As a result, as described above, the switch 3 is turned on, the electric motor 4 drives the hydraulic pump 4a, and pressure oil is discharged from the hydraulic pump 4a, and the discharged oil is the hydraulic pipe line 4b and the switching position 5A.
The pressure is fed to the hydraulic actuator 8 via the piston 8a, whereby the piston 8a extends and the driver's cab 7 is lifted as shown in FIG.

By extending the piston 8a, the hydraulic actuator 8
The pressure oil displaced inside is discharged to the reservoir 4d via the switching position 5A and the hydraulic line 4c.

When the driver's cab 7 is lifted by setting the lever 1 as shown in FIG. 2 and it is desired to fix the lifted cab 7 to a desired height, the lever 1 is again set to the neutral position in FIG. When returned, the switch 3 is turned off and the switching valve 5 is set to the switching position 5B, and the cab 7 is fixed in that position.

When the driver's cab 7 is lowered again on the chassis 6 from the state of lifting the driver's cab 7, the lever 1 is operated in the direction of arrow b in FIG. 1 to set the lever 1 to the setting shown in FIG. Set to position.

Depending on the setting, the protrusion 1c fixed to the extension member 1b causes the rocking member 2 to rotate in the direction of the arrow in FIG. 3, and the rotation causes the pusher 3a to rotate.
Is set to the ON state by urging the right side of the switch 3 so that the electric motor 4 operates to discharge the pressure oil from the hydraulic pump 4a to the hydraulic line 4b.

At the same time, in order to set the lever 1 to the state shown in FIG. 3, the link 1e is moved through the shaft 1d in the direction of arrow c (first
(Fig.) To set the switching valve 5 to the switching position 5c.

In this way, when the hydraulic pump 4a operates and the switching valve 5 is set to the switching position 5C, the discharged oil in the hydraulic pipeline 4b becomes
The piston 8a is contracted by being pumped to the hydraulic actuator 8 via the switching position 5C. As a result, the driver's cab 7 is lowered, and the pressure oil displaced in the hydraulic actuator 8 due to the contraction of the piston 8a is discharged to the reservoir 4d via the switching position 5C and the hydraulic line 4c.

Further, while the driver's cab 7 is being lowered, or when the driver's cab 7 is lowered to a predetermined travelable position on the chassis 6, the lever 1 is returned to the neutral position shown in FIG. 4a stops its operation, and the switching valve 5 is in a state in which the hydraulic actuator 8 is fluidly restrained.

In the above embodiment, the switching valve 5 uses a switching valve of a type that can be switched in the axial direction, but this uses a hydraulic switching valve of the rotary valve type and connects the rotary valve directly to the shaft 1d. You may use it.

[Effects of the Invention] As is apparent from the above description, the effects of the present invention are as follows.

1) Only by operating the single lever 1, it is possible to coordinately switch both the switch of the electric motor 4 and the switching valve 5. As a result, it becomes easier to operate the cab lifting device,
And there is no need to worry about erroneous operations.

2) To switch the electric motor 4, in the lever 1, the first protrusion 1a is fixed to the grip 1g side, and the second protrusion 1c is fixed to the opposite side, centering on the swing fulcrum (1d). Since the rocking member 2 is provided between the lever 1 and the pusher 3a, the electric motor 4 is turned on by the single switch 3 both when the cab 7 is raised and when it is lowered. It has become possible to

[Brief description of drawings]

FIG. 1 is a system diagram showing a driver's cab lifting operation device as an embodiment of the present invention, and FIG. 2 and FIG.
FIG. 1 is an operation explanatory view of FIG. 1, and FIG. 4 is a system diagram showing a basic configuration of a cab lifting device in the related art and the present invention. The symbols used in the examples are as follows. 1: Lever, 1a and 1c: Protrusion, 2: Oscillator, 3: Switch, 3
a: pusher, 4: electric motor, 4a: hydraulic pump, 5: hydraulic switching valve, 6:
Chassis, 7: cab, 8: hydraulic actuator.

Claims (1)

[Scope of utility model registration request] 1. A hydraulic actuator provided between a cab and a chassis is provided with a hydraulic conduit from a hydraulic pump driven by an electric motor, and the hydraulic actuator is extended in the hydraulic conduit. Alternatively, in the above configuration in which a hydraulic switching valve that switches the hydraulic line in the contracting direction is provided, the switching of the hydraulic switching valve is linked to each switching operation of a lever operation that swings around a fulcrum, The oscillating member that turns on and off the switch interposed between the electric motor and the power source by moving it to one side and returning it to the other side has a fulcrum centered on the fulcrum when the lever is operated to one side end. When the lever is operated to the one side by the first protrusion fixed to the operation grip side of the lever and the lever is operated to the other side end, the lever is fixed to the opposite side of the operation grip of the lever around the fulcrum. The cab-lifting operating device is characterized in that it is operated to the one side by the second protrusion.