JP2510717Y2 - 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 cab lifting device is as shown in FIGS. 4 and 5, and in FIG. 4, the hydraulic actuator 8 is provided between the cab 7 and the chassis 6. The piston 8a of the hydraulic actuator 8 is connected to the driver's cab 7, and the cylinder portion of the hydraulic actuator 8 is connected to the chassis 6.

Further, in FIG. 5, a ratchet mechanism 9 is interposed between the chassis 6 and the driver's cab 7, and a supporting member 9A is pivotally supported around a pin 9a fixedly mounted on the driver's cab 7 to support the supporting member 9A. A plurality of pawls 9b fixed to 9A, pawls 6a fixed to chassis 6 and spring 9d interposed between driver's cab 7 and supporting member 9A constitute ratchet mechanism 9, and one end of wire 9e is supporting member 9A. Is stuck to.

The operation of the above basic structure is as follows.

In FIG. 4, initially, the cab 7 is set on the chassis 6 in a normal traveling state, and the switching valve 5 is at the switching position.
It is set to 5B and the power switch of the electric motor 4 is turned off.

On the other hand, when the operator's cab 7 is lifted as shown in FIG. 4 in the above-mentioned engine inspection or repair, the switching valve 5 is set in the neutral position of the switching position 5B. Before the operation, first the power switch of the electric motor 4 is manually turned on to activate the hydraulic pump 4a, and the switching valve 5 is switched to the switching position 5A.

Then, the pressure oil in the hydraulic pipeline 4b discharged from the hydraulic pump 4a is transferred to the hydraulic actuator 8 via the switching position 5A.
, Which causes the hydraulic actuator 8 to push the piston 8a upwards, which pushes up
Lift 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.

When the driver's cab 7 is raised, the support member 9A shown in FIG. 5 has the claw 9b clawed by the urging force of the spring 9d.
It is in the state of being biased toward the 6a side, but its claw 6a and claw 9b
The shape of the claws forms a sloped part of the claws in which the claws 6a are disengaged from the claws 6a when the supporting member 9A is lifted upwards.
On the contrary, when the supporting member 9A is going to descend downward, the lower part of the pawl 9b is suspended by the pawl 6a and restrains the supporting member 9A from being lowered, that is, the driver's cab 7 being lowered. Has become.

Therefore, when the driver's cab 7 is lifted as described above, the claws 9b naturally move with the claws 6a during the lifting.
The cab 7 is lifted by the above lifting action without being restrained by the supporting member 9A.

When the driver's cab 7 is lifted to the required position in this way, the switching valve 5 is manually returned to the switching position 5B and the power switch of the electric motor 4 is also turned off manually.

In this case, since the switching valve 5 is set to the switching position 5B and the power switch of the electric motor 4 is turned off, the driver's cab 7 does not descend in that state. However, should the hydraulic pipe between the switching valve 5 and the hydraulic actuator 8 be damaged, the driver's cab 7
The support member 9A of the ratchet mechanism 9 is suspended on the pawl 6a as described above so that the cab 7 does not fall, and mechanically restrains the cab 7 in its raised position.

When the driver's cab 7 is lowered onto the chassis 6 from the lifted driver's cab 7 as shown in FIG. Perform the operation.

Turn on the power switch of the electric motor 4, and wire 9e in FIG.
Manually. Then, the support member 9A is moved around the pin 9a as shown by an arrow 9c, the pawl 9b is disengaged from the pawl 6a, and the state in which the cab 7 is restrained by the support member 9A in its raised position is released. , The manual setting to keep the wire 9e attracted during the descent of the cab 7 described below is left as it is.

In the state where the hydraulic pump 4a is driven by the electric motor 4, the switching position of the switching valve 5 is set to 5C. Then, the pressure oil in the hydraulic pipeline 4b discharged from the hydraulic pump 4a is pressure-fed to the hydraulic actuator 8 via the switching position 5C, which causes the hydraulic actuator 8 to move to the piston.
8a is pushed downward, and the lowering moves the cab 7 to the chassis 6
I will descend to the top.

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 driven, the switching position of the switching valve 5 is set to 5B, the power switch of the electric motor 4 is turned off, and the attraction of the wire 9e is returned. deep.

In the above description of the operation, 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, the cab 7 is driven as shown in FIG. The table 7 is in a state of being lifted in a state of being inclined forward.

[Problems to be Solved by the Invention] However, in the conventional operation for lifting the cab, the electric motor 4 is operated every time the operation is performed as described above.
When the power switch and the switching valve 5 are operated individually, and particularly when the driver's cab 7 is lowered, it is necessary to pull the wire 9e by manual operation and then lower the operator's cab 7.

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

[Features for Solving the Problem] The configuration of the conventional portion of the cab lifting device according to the present application is as follows.

Hydraulic pump (4a) for sending pressure oil to a hydraulic actuator (8) that raises and lowers the cab (7) on the chassis (6)
In the hydraulic pipeline from, the hydraulic actuator has one switching position for lowering the cab, another switching position for raising the cab, or a neutral switching position for stopping the cab at the raised position. The switching valve (5) for setting either of the above states is provided.

Further, in parallel with the hydraulic actuator, the ratchet that supports the driver's cab in a state in which it is about to descend from the raised state and, conversely, the support automatically disengages in a state in which the driver's cab is raised A mechanism (9) is provided.

The invention of the present application makes it possible to raise and lower the driver's cab only by operating a single lever in the above-mentioned conventional driver's cab lifting device, and automatically raises the ratchet function at the time of raising and lowers the lever at the time of lowering. The ratchet function is released in synchronization with the operation.

The structure operated by the lever is as follows.

a: The link (10) pivotally supported in the middle of the fulcrum (10a) has one end connected to the opening member (9e) that removes the ratchet function of the ratchet mechanism, and the other end abutting with the fulcrum as the center. (10b) is formed.

b: The lever (1) fitted to the shaft so as to be tiltable around the shaft (1d) has the first protrusion (1a) fixed to one side and the other side around the shaft. The second protrusion (1c) and the pusher member (1h) are fixed to each other.

Further, the tilting position of the lever is a position on one side and a position on the other side about the neutral position of the tilting.
It can be set to the position.

c: The connection relationship between the presser member and the link is as follows.

When the lever is tilted in a predetermined range from the neutral position to the position on the one side, the pusher member abuts and presses the abutting portion to move the link to the other side around the fulcrum. The ratchet function is such that the ratchet function is released via the opening member by tilting the link.

Also, when the lever tilts toward the position on the other side, the link returns to one side around the fulcrum by the attached spring urging force, and the return causes the ratchet function to be restored. Has become.

d: Oscillator (2) with one end pivotally supported to the pin (2a)
And the connection relationship between the first protrusion and the second protrusion is as follows.

When the lever is set to the position on the other side and the first projection pushes the rocking member in one direction, and when the lever is set to the position on the one side, the second projection is formed. When the oscillating member presses the oscillating member in the one direction, the movement of the oscillating member pressing in the one direction turns on the power switch (3) of the electric motor (4) that drives the hydraulic pump. It has become.

Further, at the position where the lever is set to the neutral position, the first protrusion and the second protrusion are both separated from the swing member to turn off the power switch.

e: The connection relationship between the switching valve connected to the shaft and the lever is as follows.

The switching valve is set to the other switching position in the tilting position where the lever is set to the other position, and the switching valve is set to the neutral switching position in the tilting position where the lever is set to the neutral position, In the tilted position where the lever is set to the one position, the switching valve is set to the one switching position.

[Example] Hereinafter, the present invention will be described based on an example.

FIG. 1 is a system diagram showing a driver's cab lifting operation device according to an embodiment of the present invention. The lever 1 is capable of tilting in the direction of arrow a or b with a shaft center of a shaft 1d as a fulcrum. The first projection 1a is fixed to the lever 1 on the side of the grip 1g, the second projection 1c is fixed to the extension member 1b fixed to the lever 1, and the grip 1g of the lever 1 is fixed. The pusher material 1h is fixed to the opposite side.

The link 1e is fixed to the shaft 1d which is rotated by the operation of the lever 1, and the tilting of the link 1e in the direction of arrow c or d causes the switching valve 5 to switch one switching position 5C, the neutral switching position 5B or the other switching position 5A. The switch position can be set to either of the above.

Also in the present invention, the basic structure of the cab lifting device is the same as that shown in FIGS. 4 and 5, and the electric motor 4 and the switching valve 5 in FIG. 4 are the same as the electric motor 4 in FIG.
The wire 9e, which is the same material as the switching valve 5 and serves as a release member for removing the ratchet function in the ratchet mechanism 9 in FIG. 5, is also the same as the wire 9e in FIG.

In FIG. 1, the wire 9e is connected to one end of the link 10 and the other end of the link 10 has a roller 10b as an abutting portion.
Is pivotally supported, and its link 10 has a pin 10a fitted to the fixed part.
Is pivotally supported.

Pusher 3a of power switch 3 of electric motor 4 in FIG.
Shows that the switch is turned on when it is urged to the right side of Fig. 1, and when the urging force disappears, the switch is turned off by the return force of the internal spring (of
It is configured to be in the state of f).

The oscillating member 2 is pivotally supported by the pin 2a and is tiltable 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 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 suspended on the detent 1f. When stopped, the link 1e in the neutral position sets the switching valve 5 to the switching position 5B.

Further, the illustration of FIG. 1 shows a pusher member in the lever 1.
1h is in a position where it is separated from the roller 10b. Therefore,
The biasing force of the spring 9d causes the supporting member 9A to move to the arrow in FIG.
Since it is biased in the direction opposite to 9c, the wire 9e fixed to the support member 9A returns the link 10 in the direction of arrow g around the pin 10a in FIG. The urging force tilts the support member 9A in the direction opposite to the arrow 9c until the claw 9b meshes with the claw 6a.

As a result, in this neutral position, the ratchet mechanism 9 has a ratchet function, the hydraulic line from the hydraulic actuator 8 in FIG. 4 is closed at the switching position 5B, and the hydraulic line 4b is closed. It is open to the reservoir 4d via 4c.

Further, in the state shown in FIG. 1, the switch 3 is in a state in which the pusher 3a pushes the oscillating member 2 back to the left due to the spring biasing force provided therein, and the switch 3 is set to the off state. There is. Therefore, the electric motor 4 is not driven and the hydraulic pump 4a is not operating.

When the driver's cab 7 is set on the chassis 6 and the lever 1 is set to the neutral position in this way, when the operator's cab 7 is lifted for engine inspection or repair, In the figure, the lever 1 is operated in the direction of arrow a, and the set position of the lever 1 is set to the position on the other side 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 around the pin 2a as a fulcrum. The pusher 3a of the switch 3 is biased to the right by tilting in one direction of the arrow direction, 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 lever 1 operates to rotate the shaft 1d fixed to the lever 1 in the direction of the arrow d (FIG. 1),
The link 1e fixed to 1d sets the switching valve 5 to the switching position 5A.

That is, by setting the lever in FIG.
Lever 1 pushes pusher 3a to the right to lift
Moreover, the switching valve 5 is set to a position where the driver's cab 7 can be lifted.

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.
Is sent under pressure to the hydraulic actuator 8 through which the piston 8a extends and the driver's cab 7 is raised as shown in FIG. The pressure oil displaced in the hydraulic actuator 8 by the expansion of the piston 8a is discharged to the reservoir 4d via the switching position 5A and the hydraulic pipe line 4c.

In this case, at the lever position shown in FIG. 2, the pusher member 1h is separated from the link 10, and the lever 1 and the link 10 are not linked. Therefore,
In the action of lifting the driver's cab 7, the ratchet mechanism 9 maintains the ratchet function,
As described above, the ratchet mechanism 9 does not cause the ratchet mechanism 9 to restrain the lifting because the pawl 9b naturally disengages from the pawl 6a as the driver's cab 7 rises.

Thus, 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. The switch 3 is turned off and the switching valve 5 is set to the switching position 5B, and the cab 7 is fluidly fixed in that position.

In addition, when the switching valve 5 is set to the switching position 5B and the driver's cab 7 is fixed to the lifted position as described above, the hydraulic pipe between the switching valve 5 and the hydraulic actuator 8 should be damaged. In such a case, ratchet mechanism 9
With the function of, the driver's cab 7 is mechanically restrained at that position to prevent it from falling, and safety against such a failure is guaranteed.

When the driver's cab 7 is lowered from the lifted condition on the chassis 6 again, the lever 1 is operated in the direction of arrow b in FIG. Set to the position on the side of.

As described above, when the lever 1 is operated in the direction of the arrow b in FIG. 1, the pusher member 1h of the lever 1 starts to contact the roller 10b from a predetermined position beyond the neutral position in FIG.

That is, when the lever 1 is operated in the direction of the arrow b within a predetermined range in which the pusher member 1h is in contact with the roller 10b, the operation causes the link 10 to rotate about the pin 10a as shown in FIG. Since it tilts in the direction of arrow e, the operation pulls the support member 9A in the direction of arrow 9c in FIG. 5 through the wire 9e. As a result, the pulling starts to disengage the claw 9b from the claw 6a, and the claw 9b is completely separated from the claw 6a when the operating position of the lever 1 is set to the state shown in FIG.

Also, by setting the lever 1 in FIG. 3, the extension member 1b
The protrusion 1c fixed to the tilting member tilts the rocking member 2 in the direction of arrow f in FIG. 3, and its rotation urges the pusher 3a to the right to switch 3
Set to the on state. As a result, the electric motor 4 is activated to set the state in which the hydraulic oil is discharged 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.) And set the switching valve 5 to the switching position 5C.

That is, by setting the lever in FIG.
Lever 1 urges pusher 3a to the right to lower
Moreover, the switching valve 5 is set to a position where the driver's cab 7 can be lowered.

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 descends, 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.

In this case, the ratchet mechanism 9 shown in FIG. 5 releases its ratchet function as described above by setting the lever 1 shown in FIG. The 9 will not hinder the descent.

In addition, when the lever 1 is returned to the neutral position in FIG. 1 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 hydraulic pressure The pump 4a stops its operation, and the switching valve 5 is in a state in which the hydraulic actuator 8 is fluidly restrained, and in that state, as described in detail in the explanation of the operation of the neutral position, the ratchet mechanism 9 is again activated. Ratchet function is restored.

The pin 9a, which is the fulcrum of the supporting member 9A of the ratchet mechanism 9 in the above embodiment, is fixed to the driver's cab 7 side, but its ratchet function is used when the driver's cab 7 mechanically descends. The swing fulcrum 9a of the supporting member 9A may be located on the chassis 6 side as long as it is configured to act only on the side that prevents the cab 7 from falling.

Further, in the above-described embodiment, the switching valve 5 is of a type that can be switched in the axial direction. However, this may be a structure in which a rotary valve type hydraulic switching valve is used and the rotary valve is directly connected to the shaft 1d. Good.

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

When the driver's cab 7 is raised or lowered, the operation of the power switch 3, the switching setting of the switching valve 5, and the ratchet mechanism 9 can be operated by only one operation of the lever 1. It is what

Moreover, the lever operation automatically operates the ratchet function when the driver's cab 7 is raised, and conversely opens the ratchet function when the driver's cab 7 is lowered.

As a result, it is sufficient to simply operate the lever 1 to raise and lower the driver's cab 7, and the operation of the lever 1 to raise and lower the driver's cab 7 is also linked to the ratchet mechanism 9. It also helps prevent accidents due to mistakes.

That is, conventionally, in a case where the driver's cab 7 is to be lifted up manually while the ratchet function is opened manually, the driver's cab 7 is dropped due to damage to the hydraulic pipeline or the like when the driver's cab is raised. In such a case, such a fall accident of the cab 7 can be prevented.

[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. 4 shows the operation explanatory view of FIG. 1, FIG. 4 shows the basic configuration of the cab lifting device in the conventional and the present invention by a system diagram, and FIG. 5 shows the basic of the ratchet mechanism in the conventional and the present invention. It is what showed the composition by the side view. The reference numerals used in the examples are as follows. 1: Lever, 1a and 1c: Protrusion, 1h: Pusher material, 3: Switch,
5: switching valve, 6: chassis, 7: cab, 9: ratchet mechanism,
9e: Wire, 10: Link, 10a: Pin, 10b: Roller.

Claims (1)

(57) [Scope of utility model registration request] 1. A hydraulic line from a hydraulic pump (4a) for feeding pressure oil to a hydraulic actuator (8) for raising and lowering a driver's cab (7) on a chassis (6), wherein the hydraulic actuator is used for the operation. A switching valve (5) for setting one of a switching position for lowering the cab, another switching position for raising the cab or a neutral switching position for stopping the cab at the raised position is provided. A ratchet mechanism in parallel with the hydraulic actuator for supporting the driver's cab that is in a state of being lowered from the raised state, and conversely, the support is automatically released in a state of raising the driver's cab. In the cab lifting device provided with (9), a: the link (10) pivotally supporting the middle part on the fulcrum (10a) is centered on the fulcrum, and one end side thereof is the ratchet mechanism of the ratchet mechanism. The lever (1) that is connected to the opening member (9e) that removes the function of the lever and has the other end side that forms the contact portion (10b) and that is fitted to the shaft b so that it can be tilted around the shaft (1d). ) Has a first protrusion (1a) fixed to one side and a second protrusion (1c) and a pusher member (1h) fixed to the other side of the lever, and The tilting position can be set to three positions, one on the one side and the other on the other side, centering on the neutral position of the tilting, and c: the connecting relationship between the pusher member and the link. In the tilting of the lever from the neutral position to the position on the one side in a predetermined range, the pusher member abuts and presses the abutting portion to move the link to the other side around the fulcrum. The lever releases the ratchet function via the opening member, and the lever tilts toward the position on the other side. At this time, the link returns to one side around the fulcrum by the attached spring urging force, and the return has a relationship to restore the ratchet function, and one end of the link is tiltable to the pin (2a). The supporting relationship between the oscillating member supported and the first protrusion and the second protrusion is such that the lever is set to the position on the other side, and the first protrusion moves the oscillating member in one direction. When the lever is set to the position on the one side and the second protrusion presses the rocking member in the one direction, the rocking member is pressed in the one direction. Movement turns on the power switch (3) of the electric motor (4) that drives the hydraulic pump, and at the position where the lever is set to the neutral position, both the first protrusion and the second protrusion are Remove the power switch from the oscillator. E: the switching valve connected to the shaft and the lever are connected to each other at a tilting position where the lever is set to the other position. And the switching valve is set to the neutral switching position when the lever is set to the neutral position and the switching valve is set to the one switching position when the lever is set to the one position. The cab-lifting operation device that is related to the setting.