JPS6154372A - Driver's cabin lifting-up apparatus - Google Patents

Abstract

PURPOSE:To prevent a driver's cabin from being applied with a twist by lifting up the driver's cabin with respect to a chassis by relatively extending the pistons and cylinders of one or the other actuator. CONSTITUTION:When the pressurized fluid is sent under pressure into the second conduit 3, and the first conduit 4 is opened to the atmosphere, the pressurized fluid in the conduit 3 is sent under pressure into a pushing-out chamber 1d through a throttle flow passage 3a and a pilot check valve 2, and at the same time, the pressurized fluid in the conduit 3 is sent under pressure into a pushing- out chamber 7d through a throttle flow passage 3a, pilot check valve 2, conduit 7e, and a pilot check valve 7g, and then a piston 1b and a piston 7b are pushed up, and the pushed-out working fluid is discharged into the conduit 4. Therefore, the pistons and cylinders of actuators 1 and 7 are extended relatively.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF THE INVENTION The present invention relates to a driving device for cab-o-/heavy-type automobiles and the like.

[Prior Art] Conventionally, in cab-o-type automobiles, etc., in which the engine is installed under the driver's cab, inspection of the engine is carried out in order to repair the engine.
Some vehicles are equipped with a cab lifting device, and in particular, if the cab is heavy and the cab has low rigidity, a cab lifting device may be installed on each side of the cab. ing.

A conventional structure in which cab lifting devices are provided on both sides of such a cab is as shown in FIGS. 1 and 2.

FIG. 1 shows a side view in which an actuator device lO on the one-force side of a conventional cab lifting device is interposed between a cab 5 and a chassis 6, and FIG. FIG. 2 shows a system diagram of the driver's cab lifting device in the figure.

In FIG. 1, actuator devices 10 are provided on both the left and right sides of the cab 5 in the direction of movement, but in FIG. The actuator device 10 on the right side of FIG. 2 is compatible with the actuator device 10 shown on the right side of FIG. As shown, they have exactly the same configuration.

Therefore, in the following description, in principle, the right actuator device 10 will be explained as a representative.

In the actuator device 10, a piston 1b is fitted into a cylinder 1a of the actuator 1 so as to be able to slide in the axial direction, a conduit 4 is seated in the displacement chamber IC, and the conduit 3 is connected to a throttle flow path 3a5 and a pilot check. It is connected to the displacement chamber 1d via a valve 2, a pilot line 2a in the pilot check valve 2 communicates with a line 4, and a piston 1b is connected to the displacement chamber 1d.
is connected to the driver's cab 5, and the cylinder 1a is connected to the chassis 6.

In the conventional configuration described above, the operation is as follows.

When pressure oil is fed to the pipe line 3 and the pipe line 4 is opened to a reservoir (not shown), the left and right actuator devices 10.1
At 0, the pressure oil in the pipe line 3 is pumped into the displacement chamber 1d via the throttle channel 3a, the pyro and the atto-change valve 2, and pushes the piston 1b upward, and the displacement displaced by the piston 1b is caused by the pushing up. The hydraulic oil in the chamber 1c is discharged into the reservoir through the passages 111 and 4, respectively, and the piston 1b, which has risen due to this action, pushes up the driver's cab 5 as shown in FIG.

In this case, since the driver's cab 5 is pivotally connected to a part of the chassis 6 (not shown) in front of it, when the respective pistons 1b and lb push up the driver's cab 5, the result is as shown in FIG. Then, the driver's cab 5 is in a state where it is tilted forward and lifted up.

When the cab 5 is lifted, the pipe line 3 is opened to the reservoir and the pressure oil is forced into the pipe line 4. In the left and right actuator devices 10.10, the pressure oil in the pipe line 4 is transferred via the pilot pipe line 2a. The pilot check valve 2 is pushed open, and at the same time the pressure oil in the pipe line 4 is displaced into the displacement chamber IC.
The pressure oil in the displacement chamber IC pushes down the piston 1b.

Due to this pushing down, the hydraulic oil displaced from the displacement chamber 1d is transferred to the pilot check valve 2 and the throttle channel 3.
a from the conduit 3 into respective reservoirs, thereby causing the left and right actuator devices 10.
The ten pistons 1b are lowered, and the lowering of these pistons 1b lowers the driver's cab 5.

In addition, when the above-mentioned cab 5 is descending, if pressure feeding of pressure oil to the pipe line 4 is stopped and the pipe line 4 is opened to the reservoir while the pipe line 3 is left open to the reservoir, the pilot pipe line 2
Since the hydraulic pressure in a is also released from the pipe line 4 to the reservoir, the pilot change valve 2 is similar to a normal check valve C, and at this time, the weight of the driver's cab 5 is applied downward to each piston 1b, lb. Because it has joined! I!
'Is the hydraulic oil in the chamber ld displaced by fleas through the pilot check valve 2? It tries to flow out to iτ path 3. However, the pilot check valve 2 is closed by the flow of the hydraulic oil that is about to flow out, preventing the hydraulic oil from flowing out, and the pistons lb, lb are fluidly restrained.

Additionally, the fluidic constraint described above may be applied to the tube 2184 as described above.
When the pumping of pressure oil to is stopped, it responds very sensitively to times 11:H. This is because if the response is slow, the cab 5 will continue to descend within a certain range even after it has stopped, which is dangerous.

Moreover, this good response means that the left and right biront change valves 2 operate with very high sensitivity in delicate and slightly open states.

[)3. [Problems to be Solved by Akira] However, since the left and right pilot check valves 2 operate with high sensitivity as described above, the following problems exist.

That is, when the driver's cab 5 descends as described above, the pyro 7 is released from the left and right displacement chambers 1d.
) Hydraulic oil will flow out into the pipe 3 via the check valve 2, but since the flow will flow out when the pilot check valve 2 is slightly opened, the pilot check on the left and right side will flow out. The amount of hydraulic oil flowing out from valve 2 in unit 1 does not match. As a result, the left and right pistons 1b descend at different speeds, and the different speeds cause the driver's cab 5 to descend while tilting laterally.

This causes the driver's cab 5 to be twisted, and this phenomenon must be improved.

An object of the present invention is to provide a driver's cab lifting device that improves the above-mentioned problems.

[Means for Solving the Problems] The first aspect of the present invention has the following configuration.

One of the actuator devices includes: (a) one piston is fitted into one cylinder of the one actuator so as to be able to slide in the axial direction; and (b) in the one cylinder, the axis of the one piston as described in (iii'ii); one side in the direction forms one displacement chamber and the other side forms the other displacement chamber; C: the first conduit for pumping or discharging the pressure fluid;
A second pipe line communicating with said one displacement chamber, d: discharging or pumping pressure fluid, is connected to said other displacement chamber via one pyro-2 check valve, e: said one displacement chamber. A pilot line in the pilot check valve is connected to the first line, f, the one piston or the one cylinder is connected to the driver's cab, and the one cylinder or the one piston is connected to the chassis. The other actuator device has the above configuration and is connected to the other actuator device.

a: The other piston is fitted into the other cylinder of the other actuator so as to be able to slide in the axial direction, b = In the other cylinder, one side of the other piston in the axial direction is fitted with one of the pistons. a displacement chamber is formed, -f: another displacement chamber is formed on the other side of the cylinder, C: the first conduit communicates with one displacement chamber in the other cylinder, d: the other The other displacement chamber in the cylinder is
connected to the other displacement chamber in the one cylinder via the other pilot check valve, e: the pilot pipe line in the other pilot check valve communicates with the first pipe line, f: the other piston Alternatively, the other cylinder is connected to the driver's cab, and the other cylinder or the other piston is connected to the chassis.

Without the above configuration.

The other pilot check valve 1' is connected to its pyro 7.
) When the valve is opened by a fluid pressure signal of the pipe line and the working fluid flows out from the other displacement chamber in the other cylinder to the second pipe line, the flow resistance is equal to the flow resistance of the one pilot in the case of the same operation. The above configuration has a sufficiently small value compared to the flow resistance value in the check valve.

Moreover, the second aspect of the present invention is as follows.

One of the actuator devices includes: a) one piston is fitted into one cylinder of the one actuator so as to be slidable in the axial direction; b) one of the pistons in the axial direction of the one cylinder in the one cylinder; One displacement chamber is formed on one side, and the other displacement chamber is formed on the other side; C: A first chamber for pumping or discharging pressurized fluid. The passage a communicates with the one displacement chamber, d: The second pipeline for discharging or pumping the pressure fluid is connected to the other displacement chamber via one pilot check valve, and e: The said other displacement chamber. A pilot pipe in one pilot check valve is connected to the first pipe, f: the one piston or the one cylinder is connected to the driver's cab, and the one cylinder or the one piston is connected to the chassis. The other actuator device has the above configuration and is connected to the other actuator, where a: the other piston fits into the other cylinder of the other actuator so as to be able to slide in the axial direction, and b = the other cylinder. , one displacement chamber is formed on one side in the axial direction of the other peen, and the other displacement chamber is formed on the other side, and C1 the first conduit is connected to the other peen. communicates with one displacement chamber in the cylinder, d: the other displacement chamber in the other cylinder,
connected to the other displacement chamber in the one cylinder via the other pilot check valve, e: the pilot pipe in the other pyro 7) check box communicates with the first pipe, f: the other The piston or the other cylinder is connected to the driver's cab, and the other cylinder or the other piston is connected to the shear.

The other pilot check valve is opened in response to a fluid pressure signal of the pilot line, and the flow resistance is increased when the working fluid flows out from the other displacement chamber in the other cylinder to the second line. The value is sufficiently smaller than the value of flow resistance in the one pilot check valve in the case of one-time operation, and the flow resistance between the driver's cab and the chassis on the side where the one actuator is interposed is The vehicle has the above-mentioned structure, in which a stopper is interposed to hold the driver's cab in that position when the driver's cab is lifted.

[Function] The function of the first invention in the present invention is as follows.

When pressurized fluid is pumped into the second pipe line and the first pipe line is opened to the atmosphere, the pressure fluid in the second pipe line is forced into the other displacement chamber in one cylinder through one pilot check valve. and at the same time the pressure fluid in the second line is pumped through one pilot check valve and the other pilot check valve to the other displacement chamber in the other cylinder, thereby causing the one piston and the other piston to The working fluid that is pushed up and displaced by the pushing up in one displacement chamber in one of the seven actuators and one displacement chamber in the other actuator is discharged into the first conduit.

Thus, the relative extension of the piston and cylinder in one actuator and the other actuator creates pressure in the first conduit in response to the above-mentioned action that causes the cab to be lifted relative to the chassis. When the fluid is pumped and the second pipe is opened to the atmosphere, the pressure fluid in the first pipe opens one pilot check valve through the pilot pipe in one pilot check valve, and opens the other pilot check valve. The other pilot check valve is opened via the pilot check valve in the valve, and at the same time the pressure fluid in the first line is pumped into one displacement chamber in one actuator and one displacement chamber in the other actuator.

As a result, one piston and the other piston are pushed down to the other displacement chamber side, and the working fluid in the other displacement chamber in the one cylinder side displaced by the pushing down is transferred to the other displacement chamber through one pilot check valve. The working fluid in the other displacement chamber on the other cylinder side is discharged to the second pipe line via the other pilot check valve and one pilot check valve.

In this case, the cab is lowered relative to the chassis due to the relative contraction of the piston and cylinder in one actuator and the other actuator. When the pressure fluid is stopped being fed to the first pipe line while the first pipe line remains open to the atmosphere, and the first pipe line is opened to the atmosphere, both the one and the other pilot pipes communicating with the first pipe line are also opened to the atmosphere. Therefore, both the one and the other pyrotechnic valves are similar to normal check valves. Moreover, at this time, since the second pipe line is open to the atmosphere and the other displacement chambers of one actuator and the other actuator are pressurized by the weight of the driver's cab, The working fluid in the displacement chamber attempts to flow out into the second line through one pilot check valve, and the working fluid in the other displacement chamber in the other cylinder attempts to flow out through the other pilot check valve and one pilot check valve. and attempts to discharge it to the second pipe. However, the action of the flow attempting to escape into these second conduits causes one of the pilot check valves to close, preventing that flow and fluidically holding the cab in position.

In this case, since the working fluid that is to be discharged from the other displacement chamber in the other cylinder will pass through the other pilot check valve i) η when it is trying to pass through the one pilot check valve e. ,
Under normal conditions, the working fluid attempting to be discharged from the other displacement chamber in the other cylinder will close the other pilot check valve by its flow action.

However, in the present invention, when the working fluid is discharged to the second pipe line, the flow resistance of one of the pilot check valves is different from that of the other pilot check valve in the same state. The value is sufficiently smaller than the flow resistance value (i.e., one pilot check valve is lower than the other pilot check valve).
(The valve is slightly opened so that it responds well to the tonic valve), so the flow from the other displacement chamber in the other cylinder also closes on one side before the other pilot check valve closes due to the flow. This will be blocked at the pilot check valve.

In addition, in such a lowering operation of the cab, whether the flow resistance at the other pilot check valve when the exhaust tb is applied to the second pipe or the flow resistance at the same operation at one pilot check Setting the flow resistance to be sufficiently smaller than the flow resistance means that the flow resistance at the other pilot check valve is negligible compared to the flow resistance at one pilot check valve. In other words, the flow when discharging from the other displacement chamber in the other cylinder to the second conduit is the same as the flow when discharging from the other displacement chamber in one cylinder to the second conduit. In comparison, the other pilot check valve is redundantly passed through, but the flow resistance in the other pilot check valve can be ignored, and the working fluid flows through the other pilot check valve. In the cylinder (
The flow resistance when the working fluid discharges from the displacement chamber on the Iv side to the second conduit and the flow resistance when the working fluid discharges from the other displacement chamber in one cylinder to the second conduit are substantially equal to This is equivalent to flowing only through the common flow resistance portion of one pilot check valve.

As a result, one piston and the other piston fall at the same speed.

In addition, when repairing an engine, etc. with the driver's cab lifted as described above, there is a connection between the other pilot check valve in the other actuator device and the other displacement chamber in one actuator device. If the conduit is damaged, the working fluid will leak from the other displacement chamber in one actuator device through the damaged portion.

Therefore, one piston in one actuator device will no longer be able to support the driver's cab.

On the other hand, in this case, the working fluid tries to leak from the damaged part of the other displacement chamber in the other 7-couture device, but the other pilot check valve closes due to the flow that is about to leak. The other piston in the other actuator device maintains the cab fluidly), and
This is designed to prevent the driver's cab from falling in such cases.

The operation of the second aspect of the present invention is as follows.

The invention of Mizui 2 is that the configuration is the same as the first invention. The difference is that a stopper is provided to hold the cab in that position.

Therefore, the operation of lifting or lowering the driver's cab according to the second invention is the same as that of the first invention, but as in the explanation of the operation of the first invention described above, the operation of lifting the driver's cab is the same as that of the first invention. When repairing an engine, etc. with the L port, what to do if the pipe connecting between the pilot check valve in the other actuator device and the other displacement chamber in one cylinder is damaged. The effect is different from that of the first invention.

That is, in the first invention, even if such damage occurs, the other actuator device fluidly holds the cab, but this holding is done by holding the cab on only one side of the other actuator device. Therefore, in the first aspect of the invention, one actuator device side of the driver's cab may twist down due to the damage.

In such a case, in the invention of Mizui 2, when the cab is lifted, the cab is mechanically held against the chassis by a stopper that is fixed on the side of the other actuator device. By doing so, even if such damage occurs, the driver's cab will be prevented from twisting and falling on the side of the other actuator device, and the driver's cab will also be prevented from twisting in that case.

[Example] Hereinafter, the present invention will be explained based on Examples.

FIG. 3 shows a system diagram of a driver's cab lifting device as an embodiment of the first aspect of the present invention, and is an improved version of the conventional driver's cab lifting device of the 11th sword. and the actuator device 10A is the first actuator device 10A.
The actuator device ml corresponds to the actuator device 10 installed on the right side of the driver's cab 5 in the figure, and the actuator installed on the left side of the driver's cab 5 corresponds to the actuator device 10B in FIG. 3.
In the OA, a piston 1b is fitted into a cylinder 1a of an actuator 1 so as to be able to slide in the axial direction, a first pipe line 4 communicates with the displacement chamber IC, and a second pipe line 3 is a throttle channel. 3a and a pilot check J1" 2 to the displacement chamber 1d, the pilot line 2a in the pilot check valve 2 communicates with the line 4, and the piston 1b
is connected to the driver's cab 5, and the cylinder 1a is connected to the chassis 6.

The actuator device 10B includes a piston 7 that allows the actuator 7 to slide in the axial direction in the cylinder 7a.
b are fitted, the displacement chamber 7C is connected to the pipe line 4, and the displacement chamber 7d is connected to the pyro, tochinic valve 7g and the pipe line 7e.
The pilot pipe 7h of the pilot check valve 7g is connected to the pipe line 4, the piston 7b is connected to the driver's cab 5, and the cylinder 7a is connected to the chassis 6.

Above pilot check valve 2 and pilot check valve 7
At g, the pyro/tochinic valves 2 and 7g are opened by the fluid pressure signals applied to the pilot lines 2a and 7h, respectively, and the pilot check valve 7g is opened from the side of the displacement chamber 7d to the side of the line 7e. , and in the pilot check valve 2, the displacement chamber 1
d or from the side of the pipe 7e to the side of the pipe 3, the flow resistance at the pilot check valve 7g is ten ga smaller than the flow resistance at the pilot check valve 2. 4 so that
I have completed 14 years.

In this case, specific methods for configuring the flow resistance in the pilot check valve 7g to be a value sufficiently smaller than the flow resistance in the pilot check valve 2 include: 1) Seat in the pilot check valve 7g; There are methods such as increasing the diameter, 2) increasing the lift amount of the J "pushing piston" in the pilot check valve 7g.

The operation of the first embodiment of the present invention described above will be explained below.

When the pressure fluid is forced into the second pipe line 3 and the first pipe line 4 is opened to the atmosphere, the pressure fluid in the pipe line 3 is transferred to the throttle channel 3a.
and the displacement chamber 1d via the pilot check valve 2.
At the same time, the pressure fluid in the conduit 3 is sent to the throttle flow path 3a, the throttle check valve 2. The piston 1) 1 and the piston 7
b is pushed up, and due to the pushing up, displacement chamber 1
The working fluids displaced at c and 7c are discharged into the pipe line 4, respectively.

As described above, due to the relative expansion of the pistons and cylinders in actuators 1 and 7, the cab 5
will be lifted relative to the chassis 6.

In response to the above action, when pressure fluid is fed to the pipe line 4 and the pipe line 3 is opened to the atmosphere, the pressure fluid in the pipe line 4 opens the pilot check valve 2 via the pilot pipe line 2a, and also opens the pilot pipe line 7h. Through pilot check valve 7
g is opened, and at the same time, the pressure fluid in the pipe line 4 is forced to be fed to the displacement chambers IC and 7c.

As a result, the pistons 1b and 7b are each pushed down, and the working fluid in the displacement chamber 1d displaced by the pushing down is discharged into the pipe line 3 via the pilot check valve 2 and the throttle channel 3a, and the working fluid in the displacement chamber 1d is
The working fluid is the pylon change valve 7g, the pipe 7e,
It is discharged into the pipe line 3 via the biront change valve 28 and the throttle channel 3a.

In this way, since the piston and cylinder in actuators 1 and 7 have respectively contracted relatively,
The driver's cab 5 will be lowered relative to the chassis 6.

In this case, while the pipe line 3 is open to the atmosphere,
When the pressure fluid is stopped being fed to the pipe line 4 and the pipe line 4 is opened to the atmosphere, both pilot pipes 2a and 7h, which are connected to the pipe line 4, are also opened to the atmosphere. The check valves 2 and 7g are both similar to normal check valves, and at this time, the pipe line 3 is open to the atmosphere, and the displacement chambers 1d and 7d are connected to the f of the driver's cab 5.
fi&, the working fluid in the displacement chamber 1d tries to flow out to the pipe 3 via the pilot check valve 2, and the working fluid in the displacement chamber 7d flows through the pilot check valve 7g, the pipe 7e and the pilot. The pilot check valve 2 closes due to the action of the flow trying to flow out into the pipe 3 through the check valve 2, and the flow is blocked, and the driver's cab 5 is held in its position fluidly. Ru.

In this case, since the working fluid to be discharged from the displacement chamber 7d passes through the pilot check valve 7g before passing through the pilot check valve 2, under normal conditions, the working fluid is discharged from the displacement chamber 7d. The working fluid trying to be discharged from 7d closes this pilot check valve 7g by its flow action.

However, in the present invention, in contrast to the pilot check valve 2, the pilot check valve 7g is different from the flow resistance in the pilot check valve 2 when the flow resistance is the same when discharging the working fluid to the above-mentioned pipe line 3. Since the value is sufficiently smaller than the value (that is, the pilot check valve 2 is in a slightly opened state so that it responds more responsively to the pilot loft change JP7g), from the displacement chamber 7d. The flow is also blocked at the pilot check valve 2 before the pilot check valve 7g is closed by the flow.

In addition, in such a lowering operation of the cab 5, the flow resistance at the pilot check valve 7g during the discharge operation to the pipe line 3 as described above is sufficiently greater than the flow resistance at the same operation at the pilot check valve 2. The fact that the setting is small means that the flow resistance of the pilot check valve 7 is smaller than that of the pilot check valve 2.
This means that the flow resistance at g is a small value that can be ignored.

In other words, the flow when discharging from the displacement chamber 7d to the channel 3 passes through the pilot check valve 7g more than the flow when discharging from the displacement chamber 1d to the conduit 3. However, regarding the flow resistance,
The flow resistance in the pilot check valve 7g can be ignored, and the working fluid flows into the displacement chamber 7d.
The flow resistance when the working fluid is discharged from the displacement chamber 1d to the pipe line 3 and the flow resistance when the working fluid is discharged from the displacement chamber 1d to the pipe line 3 are substantially only the common flow resistance part in the pilot check valve 2. It is equivalent to flowing.

As a result, the speed at which the piston 1b and the piston 7b are lowered is the same.

Furthermore, when repairing the engine or the like with the driver's cab 5 lifted as described above, if the conduit 7e communicating between the actuator device 10A and the actuator device 10B is damaged, Push-off room 1
The working fluid will leak out from d through the damaged part. Therefore, in the actuator device 10A, the piston 1b is no longer able to support the driver's cab 5.

On the other hand, in this case, in the actuator device 10B, the working fluid tries to leak from the damaged part of the displacement chamber 7d, but the pilot check valve 7g closes due to the flow that is about to leak, and prevents the leakage. 1
Therefore, the screw 7b in the actuator device 10B fluidly holds the driver's cab 5.

The driver's cab 5 is prevented from falling in such a case.

In the above explanation, the role of the throttle flow path 3a in FIG. 3 is to prevent the pilot check valve 2 from functioning as a check valve due to a foreign object being caught in the seat of the pilot check valve 2, and to prevent the flow of water from the displacement chambers 1d and 7d. The working fluid leaks to the side of the pipe 3, causing the driver's cab 5 to descend. This prevents it from falling suddenly.

In contrast to the embodiment of the first invention described above, the second invention of the present invention will be described in detail below.

In the second embodiment of the invention, the hydraulic system of the cab lifting device has exactly the same construction as shown in FIG. However, a mechanical stopper is interposed between the driver's cab 5 and the chassis 6 on the side of the actuator device 10A in FIG. 3, that is, on the left side as viewed in the traveling direction of the driver's cab 5.

As shown in FIG. 4, the side sectional view of the stopper is such that one end of the stopper 8-8 is pivotally connected to a pin 8a fixed to the driver's cab 5, and a spring 8d is attached to the stopper in the direction opposite to the arrow 8C. The par 8 is provided with a tooth 8b, and the chassis 6 is provided with a pawl 6a.
The above-mentioned second part is capable of selectively locking or disengaging from the
In the configuration of the embodiment of the invention, the operation is as follows1.

In the above configuration, if the bar 8 is manually rotated around the pin 8a in the direction of the arrow 8C, the teeth Bb and the pawl 6a are disengaged from each other, and in this state, the driver's cab 5 is rotated as shown in the explanation of FIG. Conversely, when lifting the cab 5 using the system shown in Fig. 3, the teeth 8
b is removed from the claw 6a, and then lifted, and in the position where the driver's cab 5 is lifted, the teeth 8b are removed from the claw 6a.
If the driver's cab 5 is locked to pin 8a,
Bar 8, tooth 8bt-JJ: Chassis 6 via the claw 6a
It is in a state where it is mechanically held.

In this way, the second embodiment of the invention of the youngest brother has a structure in which the structure of the stopper described above is added to the embodiment of the first invention.

Therefore, the operation of lifting or lowering the driver's cab 5 according to the embodiment of the invention of the second youngest brother is the same as that of the embodiment of the first invention, but as in the explanation of the operation of the embodiment of the first invention above.

When an engine or the like is repaired with the driver's cab 5 lifted up, the effect in the event that the conduit 7e is damaged is different from that in the first embodiment of the invention.

That is, in the embodiment of the first invention, even if such damage occurs, the actuator device 10B side fluidly holds the driver's cab 5, but this holding is done only on one side of the actuator device 10B. Since the driver's cab 5 is supported, in the embodiment of the first invention, if the driver's cab 5 is damaged, the actuator device 10A side of the driver's cab 5 may twist downward.

In such a case, in the embodiment of the invention of 1. In the lifted state of the driver's cab 5, the driver's cab 5 is moved against the chassis 6 by means of a spacer fixedly installed on the side of the actuator device 10A. If the actuator device 10A is held mechanically, even if such damage occurs, the actuator device 10A
This prevents the driver's cab 5 from twisting and falling on the side, and also prevents the driver's cab 5 from twisting in that case.

In the above description of the present invention, the piston 1b and the piston 7b are connected to the driver's cab 5, and the cylinder la and cylinder 7a side are connected to the chassis 6, but
In the present invention, conversely, the piston 1b and the piston 7b are M JB to the chassis 6, and the cylinder 1a and cylinder 7a sides are a! It is constructed in such a way that it is connected to the turntable 5, and it is easy to understand that the quality of the wood remains the same.

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

1) Effect of the first invention As described above, the other displacement chamber 7d in the other actuator device 10B is connected to the other displacement chamber 1d of the one actuator device 10A via the other pie control check valve 7g. , the displacement chamber 1d is connected to the second 16-way 3 via one of the pie control check valves 2.
The flow resistance of the pilot check valve 7g is sufficiently smaller than the flow resistance of the pilot check valve 2 when the working fluid is discharged from the displacement chamber 7d to the pipe line 3.

Therefore, as mentioned above, the actuator device 1 of
The operation of discharging the working fluid from the other displacement chamber 1d at 0A and the other displacement chamber 7d at the other actuator device δIOH to the pipe line 3 substantially uses only the common pilot check valve 2 in its outflow resistance. This is equivalent to the effect of discharging to the conduit 3 through the pipe.

Therefore, the pilot check valve 2 is designed to discharge the working fluid when the valve is slightly opened, but the flow resistance of the working fluid flowing out from the displacement chamber 1d to the second conduit 3 and the displacement From the chamber 7d to the second conduit 3
The flow resistance through which the working fluid exits will be substantially the same, and the rate of descent of one piston 1b and the other piston 7b will be the same, so that the descent of the cab 5 will be horizontal without any inclination on either side. This means that it is possible to descend while maintaining the

This means that when lowering the cab 5, conventionally the cab 5 could not be maintained horizontally and was lowered.
This contributes to preventing twisting that occurs in the

Further, in the cab lifting device of the present invention, by providing the other pilot check valve 7g, the pipe line 7e communicating between the one actuator device 10A and the other actuator device 10B is damaged. Even in this case, the pilot check valve 7g is closed to the displacement chamber 7.
Since this prevents the working fluid from flowing from the d side to the damaged part, it is possible to prevent the driver's cab 5 from falling in the event of such an accident when lifting the driver's cab 5. It is something.

2) Effects of the second invention In the embodiment of the first invention, even if the pipe line 7e is damaged as described above, Adana may occur. The actuator mounting 211 OB fluidly holds the driver's cab 5, but since the holding requires supporting the driver's cab 5 only on one side of the actuator mounting IOB, the embodiment of the first invention If the damage occurs, the actuator device at l OA side of the driver's cab 5 may twist downward.

In this case, the second invention is in addition to the first invention.

A stopper is interposed between the driver's cab 5 and the chassis 6 on the side of one actuator device a10A.

Therefore, if there is such a breakage of the pipe line 7e,
In an embodiment of the invention of Kibushi 2.

When the cab 5 is lifted up, the stopper fixed to the actuator device 10A allows the cab 5 to be mechanically held against the chassis 6, thereby preventing such damage. Even if this occurs, it is possible to prevent the driver's cab 5 from twisting and falling on the side of the actuator device 10A, and also to prevent the driver's cab 5 from twisting in that case.

[Brief explanation of the drawing]

FIG. 1 shows a side sectional view of a conventional driver's cab lifting device installed in an automobile. In FIG. 1, when the actuator device 10 is replaced with the actuator device of the present invention, FIG. FIG. 2 shows a system diagram of a conventional cab lifting device, and FIG. 3 shows a first embodiment of the present invention, which is an improved cab lifting device of FIG. 1. An embodiment of the invention is shown by a system diagram, and FIG. 4 shows a side view of a stopper used in a driver's cab lifting device, which is the second invention of the invention. The codes used in the examples are as follows: 1 and 7
: actuators 1a and 7a; cylinder; lb and 7b: piston; lc, ld, 7c and 7d: displacement chamber; 7e and 7f: conduit; 7g: pilot check valve. 7h: Pilot tube. 2. Parf lot change valve 2a: Pilot pipe. 3 and 4: Conduit 3a two-throttle channel. 5: Cab 6: Chassis 6a: Claw. 8 Nibar 8a: Pin, 8b: Mountain, 8d Nispring. Patent applicant: Etsushi Nishikai, representative of Sanwa Seiki Co., Ltd.

Claims (1)

[Claims] 1. One actuator device includes: a: one piston is fitted into one cylinder of the one actuator so as to be able to slide in the axial direction; One displacement chamber is formed on one side in the axial direction of one piston, and the other displacement chamber is formed on the other side; , communicates with the one displacement chamber, d: a second pipe line for discharging or pumping pressure fluid is connected to the other displacement chamber via one pilot check valve, e: the one pilot A pilot pipe in the check valve communicates with the first pipe, and f: the one piston or the one cylinder is connected to the cab, and the one cylinder or the one piston is connected to the chassis. The other actuator device has the above configuration, and a: the other piston fits into the other cylinder of the other actuator so as to be able to slide in the axial direction, and b: the other cylinder has the above-mentioned One displacement chamber is formed on one side in the axial direction of the other piston, and the other displacement chamber is formed on the other side, c: The first conduit is connected to one side of the other cylinder. d: The other displacement chamber in the other cylinder is connected to the other displacement chamber in the one cylinder via the other pilot check valve, and e: The other displacement chamber in the other pilot check valve is connected to the other displacement chamber in the one cylinder. a pilot conduit communicates with the first conduit, f: the other piston or the other cylinder communicates with the cab, and the other cylinder or the other piston communicates with the chassis; The other pilot check valve is opened by a fluid pressure signal of the pilot pipe, and the working fluid flows out from the other displacement chamber in the other cylinder to the second pipe. The cab lifting device having the above structure, wherein the flow resistance at the time of operation is sufficiently smaller than the flow resistance at the one pilot check valve under the same operation. 2. One of the actuator devices has the following features: a: One piston is fitted into one cylinder of the one actuator so as to be able to slide in the axial direction, and b: In the one cylinder, the one piston is fitted in the axial direction. one displacement chamber is formed on one side and the other displacement chamber is formed on the other side, and c: the first conduit for pumping or discharging the pressure fluid is connected to the one displacement chamber. d: A second pipe line for discharging or pumping pressure fluid is connected to the other displacement chamber via one pilot check valve, and e: A pilot pipe line in the one pilot check valve. is in communication with the first conduit, and f: the one piston or the one cylinder is connected to the driver's cab, and the one cylinder or the one piston is connected to the chassis. None, the other actuator device has the following features: a: The other piston is fitted into the other cylinder of the other actuator so as to be able to slide in the axial direction, and b: The other piston is fitted in the other cylinder in the axial direction. one displacement chamber is formed on one side of the cylinder, and another displacement chamber is formed on the other side of the cylinder, c: the first conduit communicates with one displacement chamber of the other cylinder; , d: The other displacement chamber in the other cylinder is connected to the other displacement chamber in the one cylinder via the other pilot check valve, and e: The pilot pipe line in the other pilot check valve is connected to the other displacement chamber in the one cylinder through the other pilot check valve. f: the other piston or the other cylinder is connected to the driver's cab, and the other cylinder or the other piston is connected to the chassis; , the other pilot check valve opens in response to a fluid pressure signal of the pilot pipe, and the flow resistance when the working fluid flows out from the other displacement chamber in the other cylinder to the second pipe is increased. , the flow resistance value is sufficiently smaller than the value of the flow resistance in the one pilot check valve in the case of the same operation, and the flow resistance between the driver's cab and the chassis on the side where the one actuator is interposed is The driver's cab lifting device having the above configuration includes a stopper that holds the driver's cab in that position when the driver's cab is lifted.