JPS6154371A - Driver's cabin lifting-up apparatus - Google Patents

Abstract

PURPOSE:To lower a driver's cabin, keeping it horizontally, by connecting the pushing-out chambers of two actuator apparatuses to a conduit through a pilot check valve in common. CONSTITUTION:When the pressurized fluid is sent under pressure into a conduit 4, and a conduit 3 is opened to the atmosphere, pistons 1b and 7b are pushed down, and the working fluid in the pushing-out chambers 1d and 7d is discharged into the conduit 3 through a pilot check valve 2 and a throttle flow passage 3a. Therefore, a driver's cabin is lowered with respect to the chassis. The discharge conditions for each working fluid which is discharged from the pushing-out chambers 1d and 7d is made equal, and each lowering speed of the pistons 1b and 7b is made equal.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a cab lifting device for a cab-over type automobile or the like.

[Conventional Technique 11-1] Conventionally, in cab-over type automobiles, etc., in which the engine is installed under the cab, a cab lifting device has been used to inspect or repair the engine. In some cases, especially those with heavy cabs and low rigidity, turntable lifting devices are provided on both sides of the cab.

A conventional structure in which a driver's cab is provided with turntable lifting devices on both sides is shown in FIGS. 1 and 2.

FIG. 1 shows a side view in which one actuator device 10 of a conventional cab lifting device is interposed between a cab 5 and a chassis 6, and FIG. A system diagram of the platform lifting device is shown.

In FIG. 1, actuator devices 10 are provided on both left and right sides of the driver's cab 5 in the direction of movement, but in FIG. Corresponds to the actuator device '110 shown on the right side in Figure 2,
The actuator device 10 on the left side corresponds to the actuator device 10 shown on the left side of FIG. 2, and these left and right actuator devices 10 have exactly the same configuration as shown in FIG. 2.

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

The actuator device 10 includes a piston 1b that is slidable in the axial direction in a cylinder 1a that is bored in the actuator 1.
are fitted, the pipe line 4 communicates with the displacement chamber IC, and the pipe line 3
is connected to the displacement chamber 1d via the throttle flow path 3a and the pilot check valve 2, and the pilot pipe 2a in the pylon check valve 2 communicates with the pipe 4, and the piston 1
b is connected to the 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 into the pipe line 3 and the pipe line 4 is opened to a reservoir (not shown), the left and right actuator devices 10.10
In this case, the pressure oil in the pipe line 3 is connected to the throttle channel 3, respectively.
Displacement chamber 1 via a and pylon check valve 2
d, pushing the piston 1b upward.

The hydraulic oil in the displacement chamber IC, which is displaced by the piston 1b due to the upward movement, is discharged into the reservoir through the pipe 4, and the piston 1b, which has risen due to this action, pushes the driver's cab 5 into the ground as shown in FIG. Gone.

In this case, since the driver's cab 5 is pivotally connected to a part of the chassis 6 (not shown) on the 1) 1j side, when the respective pistons 1b and 1b push up the driver's cab 5, the first As shown in the figure, the driver's cab 5 is held in a state where it is tilted forward, and the driver's cab 5 is in a state where it is tilted forward.

When the driver's cab 5 is lifted, the escape route 3 is opened to the driver and 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. Push open the pie control check valve 2, and at the same time pressurized oil in the pipe line 4 is displaced into the displacement chamber 1c.
pressure in the displacement chamber LC/III
continues to push down the piston 1b.

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

In addition, if the pressure feeding of pressure oil to the pipe line 4 is stopped while the cab 5 is descending, the hydraulic pressure in the pilot pipe line 2a is released to the atmosphere via the pipe line 4. Because it is opened, the pie control check valve 2 becomes similar to a normal check valve, and at this time, the weight of the driver's cab 5 is applied downward to each of the screws 1, lb, and lb, so the weight causes the displacement chamber to close. The hydraulic oil in ld tries to flow out into pipe line 3 via pie control check valve 2. However, the piston check valve 2 closes due to the flow of the hydraulic oil that is about to flow out, preventing the hydraulic oil from flowing out, and the pistons 1b, 1b are physically restrained by iAE.

The above-mentioned fluid restraint responds very sensitively at the same time as stopping the pumping of pressure oil to the pipe line 4 as described above. Assuming it's that responsive or sluggish,
Even after it stops, the cab 5 will continue to descend, and the
This is because it is emotionally dangerous.

Also, to say that this response is good is the left Li's Pyro 7)
This means that the change valve 2 operates with very high sensitivity.

C Problems to be Solved by the Invention However, since the left and right pie control check valves 2 operate with high sensitivity as described above, the following problems exist.

That is, when the driver's cab 5 descends as explained above, the respective pyrotrons are released from the left and right displacement chambers 1d.
The hydraulic oil will flow out into the pipe 3 via the two-way check valve 2, but since the outflow will flow out when the pilot check valve 2 is slightly open, the pilot check valves on the left and right will 2, the outflow amount of hydraulic oil in unit time becomes inconsistent. 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 problem] The first aspect of the present invention has the following configuration.

One of the actuator devices includes: (a) one piston is fitted into one of the cylinders with a hole in the one actuator so as to be able to slide in the axial direction; b = in the one cylinder, the one piston One displacement chamber is formed on one side in the axial direction, and the other displacement chamber is formed on the other side, C: The first pipe line for pumping or discharging the pressure fluid is
A second pipe line communicating with the one displacement chamber, d: discharging or pressurizing the pressure fluid, is connected to the other displacement chamber described in 1J through a pi control check valve, e; The pilot pipe in the check valve communicates with the iSl' passage, f: the one piston or the cylinder on the - side is connected to the driver's cab,
- and +iii The one cylinder or the one piston is in contact with the chassis.

With the above configuration, the other actuator device has the following features: a: The other piston is fitted into the other cylinder bored in the other actuator so as to be able to slide in the h11 direction.

b: In the other cylinder, 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, and C: the Ml conduit. communicates with one displacement chamber in the other cylinder, d: the other displacement chamber in the other cylinder,
communicates with the other displacement chamber in the one cylinder, e. the other piston or the other cylinder is connected to the driver's cab, and the other cylinder or the other piston is in contact with the chassis; It consists of the above structure.

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 bored in one actuator so as to be able to slide in the +11 direction; b = an axis of the one piston in the one cylinder; 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;
Communicates with the one displacement chamber.

d: The second pipe line for discharging or pumping the pressure fluid is
Connected to the other displacement chamber via a pilot check valve.

e: The pilot pipe line in the pilot check valve is connected to the first pipe line, and f: There is a first check valve and a second pipe line between the other displacement chamber and the second pipe line.
g: 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 conditions: a: The other piston fits into the other cylinder bored in the other actuator so as to be able to slide in the axial direction, and b = The other piston fits into the other cylinder bored in the other actuator. One displacement chamber is formed on one side in the axial direction of the cylinder, and another displacement chamber is formed on the other side, and C: the first conduit is connected to one displacement chamber in the other cylinder. d: the other displacement chamber in the other cylinder,
communication between the first check valve and the second check valve, e: 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 driver's cab; It is connected to the chassis and consists of the above configuration.

Further, the third aspect of the present invention is as follows.

One of the actuator devices includes: (a) one piston is fitted into one cylinder bored in one actuator so as to be able to slide in the @11 direction; b = one piston as described in (1iii) in the one cylinder; One side in the axial direction forms one displacement chamber, and the other side forms a force displacement chamber,
Communicates with the one displacement chamber.

d: The second pipe line for discharging or pumping the pressure fluid is
connected to the other displacement chamber via a pilot check valve, e: a pilot pipe in the pilot check valve communicates with the first pipe, f: a connection between the other displacement chamber and the second displacement chamber; A first check valve and a second check valve are connected to the pipe line.
g. 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. None, the other actuator unit 2.

a: The other piston fits into the other cylinder bored in the other actuator so as to allow t [It in the axial direction, b = One side of the other piston in the axial direction in the other cylinder one displacement chamber is formed on the other side, and the other displacement chamber is formed on the other side, C: the first conduit communicates with one displacement chamber in the other cylinder, d: the The other displacement chamber in the other cylinder is
the first check valve and the second check valve are connected to each other; e: the other piston or the other cylinder is connected to the driver's cab; The other screw 1 is connected to the chassis No. 1111, which has the above configuration, and the cab No. 111 is lifted up between the driver's cab and the chassis on the side where the other actuator is interposed. A stopper is provided to hold the driver's cab in that position when the cab is turned.

It consists of the above structure.

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

When pressurized fluid is fed into the second pipe line and the first one-way passage is opened to the atmosphere, the pressure fluid in the second pipe line is transferred to the other displacement chamber in one cylinder and the other displacement chamber through the pilot check valve. It is forced into both the other displacement chambers in the cylinder, thereby pushing up one piston and the other piston, and the pushing up causes displacement in one displacement chamber in one actuator and one displacement chamber in the other actuator, respectively. The working fluids discharged into the first pipes, respectively.

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 line is opened to the atmosphere, the pressure fluid in the first line opens the pilot check valve via the pilot line, and at the same time the pressure fluid in the first line opens the pilot check valve in one actuator. As a result of being forced into one displacement chamber and the other displacement chamber in the other actuator, one piston and the other piston are respectively pushed down to the side of the other displacement chamber, and the side of one cylinder that is displaced by the pushing down. The respective working fluids in the other displacement chamber in the cylinder and in the other displacement chamber in the other cylinder both exit υ1 into the second conduit through a common pilot check valve. Due to the relative contraction of the piston and cylinder in the actuator, the driver's cab will be lowered with respect to the chassis. When the pressure fluid of the first pipe is stopped and the first pipe is opened to the atmosphere, the pilot pipe communicating with the first pipe is also opened to the atmosphere, so the pilot check valve 1' - is the same as a regular check valve, and at this time, the second pipe line is open to the atmosphere and 11. Since the respective other displacement chambers in one actuator and the other actuator are in the pressurized state yE by the driver's cab, the working fluid in those other displacement chambers is passed through the pilot check valve to the second pipe. The outflow action causes the pylon tonic valve to close, preventing the outflow and fluidically holding the cab in place.

In the lowering action of the cab as described above, the working fluid discharged from the other displacement chamber in one cylinder and the other displacement chamber in the other cylinder are both
The liquid is discharged to the second pipe through a common pilot check valve that is opened.

Therefore, the discharge conditions to the second pipe line for the working fluid discharged from the other displacement chamber in one cylinder and the other displacement chamber in the other cylinder are exactly the same, and as a result, , one piston and the other piston will come down at the same speed.

The action of the second invention in the uninvented state is as follows.

When pressurized fluid is pumped into the second conduit and the first full line is opened to the atmosphere, the pressurized fluid in the second conduit is transferred to the other displacement chamber in one cylinder via the pilot check valve. Forced.

At the same time, the pressure fluid in the second conduit is forced through a second check valve into the other displacement chamber in the other cylinder, thereby displacing one piston and the other piston, The working fluids displaced in one displacement chamber of one actuator and one displacement chamber of the other actuator due to the upward movement are discharged into the first conduit, respectively.

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 line is opened to the atmosphere, the pressure fluid in the first line opens the pilot check valve via the pyro line, and at the same time the pressure fluid in the first line opens the pilot check valve through the pyro line. As a result of being pumped into one displacement chamber in the actuator and one displacement chamber in the other actuator, one piston and the other piston are respectively pushed down to the side of the other displacement chamber, and in the pushing down, one of the displaced pistons is pushed down. The working fluid in the other displacement chamber on the cylinder side is discharged into the second line through the pylon check valve, and at the same time the working fluid in the other displacement chamber in the other cylinder is discharged through the first check valve and the pylon tonic valve. It is discharged to the pipe @2 through the . At this time, the second check valve is closed by the working fluid discharging from the other displacement chamber in the other cylinder, so that the working fluid flows directly from the other displacement chamber in the other cylinder to the second conduit. However, this is not uncommon.

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. If the pressure fluid is stopped being fed to the first pipe while the first pipe is open to the atmosphere, and the first pipe is opened to the atmosphere, the pilot pipe communicating with the second pipe is also opened to the atmosphere. Therefore, the pilot check valve is similar to a normal check valve. At this time, since the second pipe line is open to the atmosphere and the other displacement chambers in one actuator and the other actuator are pressurized by the weight of the driver's cab, the displacement chambers of the dragons The working fluid is pilot chain.

The valve closes, the outflow is blocked, and the turntable is fluidically placed in that position. Retained.

In lowering the cab as described above, on one actuator side, the working fluid is discharged directly from the displacement chamber on the other side to the second pipe line via the pilot check valve, whereas on the other side On the actuator side, the working fluid is discharged from the other displacement chamber through the first check valve and then through the pyro-ntchefuku valve into the second conduit.

However, when the first check valve, which is a normal check valve, operates in the direction of passing the working fluid, the passage resistance of the working fluid is extremely small; This value is negligibly small compared to the passage resistance of the pilot check valve, which is opened by the fluid pressure in the first pipe line, and allows the fluid to pass therethrough.

Therefore, in the lowering action of the cab as described above,
The working fluid discharging from the other displacement chamber in one cylinder and the other displacement chamber in the other cylinder substantially only through a common pilot check valve that is both open: i'LJ2. The condition is the same as that discharged into the pipe.

As a result, the discharge conditions for the working fluid discharged from the other displacement chamber in one cylinder and the other displacement chamber in the other cylinder, respectively, to the second pipe line are the same, and one piston And the other piston will come down at the same speed.

In addition, in the lowering operation of the cab as described above, the first check valve and the If the pipe line communicating with check valve 2 is damaged, the following actions will occur.

Since the working fluid in the other displacement chamber in the other cylinder is discharged from the damaged part, the other piston is unable to fluidically hold the driver's cab.
It becomes E.

However, since the first check valve is interposed between the other displacement chamber in one cylinder and the other displacement chamber in the other cylinder, the first check valve and the other displacement chamber in the other cylinder Even if the working fluid tries to flow out from the other displacement chamber of one cylinder to the damaged part due to the above-mentioned damage between the displacement chamber and the displacement chamber, the flow will be blocked by the first chain valve and the pilot check valve. will be blocked by.

As a result, even if such damage occurs, one of the actuator devices fluidly holds the driver's cab, thereby preventing the driver's cab from falling.

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

The invention of Kibushi 3 is the second invention due to its structure.

[A stopper is interposed between the driver's cab and the chassis on the side where the other actuator device is interposed, to hold the driver's cab in that position when the driver's cab is lifted.'' It has an added configuration.

Therefore, the operation of lifting or lowering the driver's cab according to the invention of youngest brother 3 is the same as that of the second invention, but as described in the explanation of the operation of the second invention described above, when the operator's cab is lifted up or in the reverse position, the engine etc. When repairing a cylinder, if the pipe line running from the other displacement chamber to the first check valve and the second check valve is damaged, the effect will be as follows. This is different from invention No. 2.

In other words, in the second invention, even if such damage occurs, one actuator device fluidly holds the driver's cab, but this holding is possible if only one actuator device jδ is operated on one side. Since it supports the cab, in the second aspect of the invention, if the cab is damaged, the side of the other actuator device of the driver's cab may be twisted downward.

In such a case, in the invention of Section 3, if the driver's cab is mechanically held against the chassis by a stopper fixed to the side of the other actuator device while the driver's cab is in a lifted state. Even if such damage occurs, the driver's cab is prevented from twisting and falling on the side of the other actuator device, and the driver's cab is also 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 cab lifting device as an embodiment of the first aspect of the present invention, and is an improved version of the conventional cab lifting device shown in FIG. The actuator device 10A corresponds to the actuator device 1O provided on the right side of the driver's cab 5 in the traveling direction of FIG. 1, and the actuator device 10A provided on the left side of the driver's cab 5 corresponds to the actuator device 10B in FIG. Actuator device 10A corresponding to
In this case, a piston 1b is fitted into a cylinder la bored in the actuator 1 to enable 16 movements in the axial direction, a pipe line 4 of %11 is communicated with the displacement chamber IC, and a second pipe line 3 is connected to the throttle. The flow path 3a and the pilot check valve 2 are connected to the displacement chamber 1d via the pilot check valve 2, and the pilot line 2a in the pilot check valve 2 is! The piston lb is connected to the driver's cab 5, and the cylinder 1a is connected to the chassis 6.

In the actuator device 10B, the piston 7b is fitted in the axial direction to the cylinder a bored in the actuator 7 so as to enable c7) If fJJ, the pipe line 4 is connected to the displacement chamber 7C, and the displacement chamber 7d is connected to the piston 7b. r; - It communicates with the displacement chamber 1d via the passage 7e, the piston 7b is connected to the driver's cab 5, and the cylinder 7a is in contact with the chassis 6 a.

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 pressurized fluid through the pilot check valve 2 is forced into the displacement chamber 7d via the pipe 7e, whereby the piston 1b and the piston 7b are pushed up by the pressured fluid, and the pressure fluid is pushed up. The working fluids displaced in the displacement chambers IC and 7C are discharged into the conduit 4, respectively.

In this way, actuator 1 and actuator 7
The relative expansion of the piston and cylinder causes the driver's cab 5 to be lifted relative to the chassis 6.

In response to the above action, when pressurized 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 at the same time, the pressure fluid in the pipe line 4 opens the pilot check valve 2 through the pilot pipe line 2a. The kero pressure fluid is fed under pressure to the displacement chamber IC and the displacement chamber 7C.

As a result, the piston 1b and the piston 7b are each pushed down, and the working fluids in the displacement chambers 1d and 7d displaced by the pushing down are both pyro.

It is discharged into the pipe line 3 via the tonic valve 2 and the throttle channel 3a.

As described above, since the piston and cylinder of each of the actuators 1 and U7 are relatively contracted, the driver's cab 5 is lowered with respect 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, the pilot pipe line 2a communicating with the pipe line 4 is also opened to the atmosphere.
is the same as a normal check valve, and at this time, since the route 3 is open to the atmosphere and the respective displacement chambers 1d and 7d are pressurized by the claw 1ii of the driver's cab 5, the displacement chambers 1d and 7d are in a pressurized state. The working fluid at 7d tries to flow out to the pipe 3 through the pyro 7) check valve 2, but due to the action of the flow that is about to flow out, the pyro 7) check valve 2 automatically closes, and the working fluid does not flow out. blocked and the cab 5 is fluidly held in that position.

In the above-described lowering operation of the cab 5, the working fluid discharged from the displacement chambers 1d and 7d is discharged to the pipe line 3 via the common pilot check valve 2 which is opened. ing.

Therefore, the discharge conditions for the working fluid discharged from the displacement chambers 1d and 7d, respectively, into the pipe line 3 are exactly the same, and as a result, the speeds at which the pistons 1b and 7b are lowered are the same. It will come.

Note that the role of the throttle channel 3a in FIG.
/ Due to a foreign object caught in the seat of the tonic valve 2, the check valve action of the pilot check valve 2 becomes impossible, and the working fluid from the displacement chambers 1d and 7d crystallizes out, causing the cab 5 to descend. When the engine is turned off, the throttle flow path 3a restricts the flow of the working fluid flowing out to prevent the driver's cab 5 from moving down by 1° suddenly. The same applies to FIG. 4, which will be described later.

In contrast to the embodiment shown in FIG. 3 above, FIG. 4 shows a system diagram of the cab lifting device as an embodiment of the second invention of the present invention. This is an improved table lifting device, and the actuator equipment
11 corresponds to the actuator device 10 provided on the right side of the driver's cab 5 in the direction of movement of the driver's cab 5 in FIG. There is.

The difference between FIG. 4 and FIG. 3 is that in FIG.
In contrast to the configuration in which the first check valve 1 directly communicates with the displacement chamber 1d, in FIG.
e and a second check valve 1f are interposed between the displacement chamber 1d and the conduit 3, and the conduit 7e is connected to the first check valve 1f.
e and the second check valve 1f, and other configurations are the same as those shown in FIG. 3.

Further, members having the same reference numerals in FIG. 4 as those in FIG. 3 indicate the same materials as in FIG. 3.

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

When the pressure fluid is fed to the pipe line 3 and the pipe line 4 is opened to the atmosphere,
The pressure fluid in the pipe line 3 is sent under pressure to the displacement chamber 1d via the throttle channel 3a and the pilot check valve 2,
At the same time, the pressure fluid in line 3 is transferred to the second check valve i
f and is fed under pressure to the displacement chamber 7d via the conduit 7e,
As a result, the pistons 1b and 7b are pushed up, and the working fluids displaced in the displacement chambers lc and 7C, respectively, are discharged into the pipe 4. In this way, the pistons and cylinders in the actuators 1 and 7 are Due to the relative extension, the driver's cab 5 is lifted with respect to the chassis.

In response to the above action, when pressure fluid is fed into the pipe 4 and the pipe 3 is opened to the atmosphere, the pressure fluid in the pipe 4 opens the pilot check valve 2 via the pilot pipe 2a, and at the same time, the pressure fluid in the pipe 4 opens the pilot check valve 2 through the pilot pipe 2a. The pressure fluid is displaced in the displacement chambers 1c and 7.
It is pumped to c.

As a result, the pistons 1b and 7b are each pushed down, and the working fluid in the displacement chamber 1ci that is displaced by the pushing down is discharged into the pipe line 3 via the pilot check valve 2 and the throttle flow path 3a, and at the same time, the working fluid in the displacement chamber 1ci is discharged through the pilot check valve 2 and the throttle channel 3a. The working fluid is discharged to the pipe line 3 via the first check valve 1e, the pilot check valve 2, and the throttle passage 3a. At this time, the second check valve 1f is closed by the working fluid discharged from the displacement chamber 7d, and as a result, the working fluid is not directly discharged from the displacement chamber 7d into the pipe line 3. It has become.

As described above, since the pistons and cylinders of the actuators 1 and 7 are relatively contracted, the driver's cab 5 is lowered with respect 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, the pilot pipe line 2a communicating with the pipe line 4 is also opened to the atmosphere, so the pilot check valve 2 performs the normal check. It is similar to a valve. At this time, since the pipe line 3 is open to the atmosphere and each of the displacement chambers 1d and 7d is pressurized by the weight of the cab 5, the working fluid in the displacement chambers 1d and 7d passes through the pilot check valve 2. However, the pilot check valve 2 closes due to the action of the outflow, preventing the outflow, and the driver's cab 5 is fluidly held at that point 111.

At this time, the second check valve 1f is also closed by the working fluid which is about to be discharged from the pipe line 7e to the pipe line 3, and the working fluid is discharged from the displacement chamber 7d to the pipe line 3 via the pipe line 7e and the check valve 1f. jff, the flow of trying to come out is being blocked.

When the cab is lowered, on the actuator 1 side, the pilot check valve 2 is directly connected from the displacement chamber 1d.
The working fluid is discharged to the conduit 3 through the duct 3, whereas on the side of the unit unitar, after passing from the displacement chamber 7d through the first check valve 1e,
Working fluid is discharged into a conduit 3 via a pilot check valve 2.

However, the first check valve 1e, which is a normal check valve,
When the valve is operated in the direction of passing the working fluid, the passage resistance of the working fluid is made as small as JI'; This value is negligibly small compared to the passage resistance of the pilot check valve 2 when the fluid is passed through.

Therefore, in the lowering action of the driver's cab 5 as described above, the working fluid discharged from the displacement chambers 1d and 7d actually flows only through the common pilot check valve 2 and the throttle flow path 3a, both of which are opened. The water is discharged to the pipe line 3 through the pipe.

As a result, the discharge conditions for the working fluids discharged from the displacement chambers 1cl and 7d, respectively, to the pipe line 3 are the same, and the speeds at which the pistons lb and 7b are lowered are the same. It turns out.

Furthermore, in the above-described lowering operation of the driver's cab 5, if the pipe line 7e communicating between the actuator device ff1ll and the actuator device 12 is damaged, the following effect will occur.

Since the working fluid in the displacement chamber 7d flows out by υ1 from the damaged portion, the piston 7b is unable to hold the driver's cab 5 fluidly.

However, between the displacement chamber 1d and the displacement chamber 7d,
Since the first check valve 1e is interposed, if the space between the first check valve 1e and the displacement chamber 7d is damaged as described above, the working fluid will flow from the displacement chamber 1d to the damaged part. Even so, the leak is the first che.

This is blocked by the valve 1e and the pilot check valve 2.

As a result, even if such damage occurs, the actuator device 11 fluidly maintains the driver's cab, thereby preventing the driver's cab from falling.

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

In the third embodiment of the invention, the hydraulic system of the cab lifting device has the same rotating configuration as 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 12 in FIG. 4, that is, on the left side as viewed in the traveling direction of the driver's cab 5.

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

In the above configuration, if the par 8 is manually rotated around the pin 8a in the direction of the arrow 8C, the engagement between the i8b and the pawl 6a is removed. In this state, the cab 5 can be lowered as shown in the explanation of FIG. 4, and conversely, when the cab 5 is lifted by the system of FIG. If the driver's cab 5 is lifted and the i8b is locked to the claw 6a in the lifted position, the driver's cab 5 will be attached to the pin 8.
a, 8-8, south 8b, 1-ji and pawl 6a to mechanically hold the chassis 6.

As described above, the configuration of the embodiment of the third invention of Mizui is such that the above-described stopper configuration is added to the embodiment of the second invention.

Therefore, the operation of lifting or lowering the driver's cab 5 according to the embodiment of the third invention is the same as the embodiment of the second invention, but as in the explanation of the operation of the embodiment of the second invention above, When an engine or the like is repaired with the driver's cab 5 lifted up, the effect when the conduit 7e is damaged is different from the embodiment of the second invention.

That is, in the embodiment of the second invention, even if such damage occurs, the actuator device 11 will not be able to connect to the driver's cab 5.
However, in order to hold the cab 5 on only one side of the actuator device 11, in the embodiment of the second invention, if the cab 5 is damaged, the operation is interrupted. It is possible that the side of the actuator device 12 of the platform 5 twists down.

In such a case, in the embodiment of the invention of Mizuo 3, when the driver's cab 5 is lifted up, the driver's cab 5 is
If the cab 5 is mechanically held against the chassis 6, even if such damage occurs, the twisting and falling of the cab 5 on the actuator device 12 side can be prevented, and the cab 5 can be This also prevents twisting of the structure shown in FIG.

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 1a and the cylinder 7a side are connected to the chassis 6, but the present invention conversely Even if the piston lb and the piston 7b are connected to the chassis 6, and the cylinder la and the cylinder 7a side are connected to the driver's cab 5, it is easy to understand that the essence remains the same.

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

l) Effect of the first invention The other displacement chamber 1d in one actuator device fl 1 OA and the other displacement chamber 7d in the other actuator device t OB are both connected via a common pilot check valve 2 to the pipe of 52. It is configured to be connected to road 3.

Therefore, in the action of lowering the driver's cab 5, one cylinder 1
Displacement chamber 1d of external force in a and the other cylinder 7a
When the working fluid from the other displacement chamber 7d in is discharged into the second pipe line 3 via the pilot chain valve 2, the other displacement chamber 1d in the one cylinder la and the other cylinder 7a Since the working fluid from the other displacement chamber 7d passes through the same pilot check valve 2 in common, the working fluid is discharged from both displacement chambers 1d and 7d under the same conditions. There is.

Therefore, even if the working fluid is discharged when the pilot check valve 2 is slightly opened, the conditions for discharging the working fluid from both displacement chambers 1d and 7d to the conduit 3 are common. Because of this, the displacement room 1d
The flow rate per hour at which the working fluid flows out from the displacement chamber 7d into the second pipe line 3 is the same as the flow rate per time at which the working fluid flows out from the displacement chamber 7d into the second pipe line 3. The descending speed is the same as that of the other piston 7b, and as a result, the 1ML turntable 5 descends while maintaining the horizontal state without inclining either side.

This means that when lowering the cab 5, conventionally the cab 5 could not be maintained horizontally and was lowered.
The purpose is to prevent twisting that may occur in the case.

2) Effect of the second invention The second invention provides the first check valve 1e and the second check valve 1f together with the pilot check valve 2 in the first invention, and displaces the other in the other cylinder 7a. The chamber 7d is connected to the first check valve 1e and the second check valve i.
The structure is such that it communicates with f.

As a result, in addition to the effects of the first invention, the effect is that when the driver's cab 5 is lifted and the engine is inspected and repaired, communication between one actuator device @ 11 and the other actuator device 12 is improved. In the event that the pipe line 7e that is in operation is damaged, the first check valve 1e prevents the working fluid from flowing from one actuator device 11 to the damaged portion, and the one actuator device 11 is stopped from operating. It is possible to prevent the table 5 from falling.

Therefore, the second invention prevents the driver's cab 5 from twisting when the driver's cab 5 is lowered, and also prevents the driver's cab 5 from falling when the conduit 7e is damaged. .

3) Effect of the third invention In the embodiment of the second invention, the actuator device 11 fluidly holds the driver's cab 5 even if the pipe line 7e is damaged as described above. The holding is performed by operating only one side of the actuator device 11, and the stand 5
Therefore, in the embodiment of the second invention, the actuator device 12 side of the driver's cab 5 may twist downward due to the damage.

In this case, the third invention includes, in addition to the second invention, the driver's cab 5 and the chassis 6 on the other actuator device 12 side.
A stopper is interposed between them.

Therefore, in the case of such damage to the conduit 7e, in the embodiment of the invention of Section 3, the stopper fixed to the actuator device 12 side prevents the cab 5 from being removed while the cab 5 is lifted. can be mechanically held against the chassis 6, and as a result,
Even if such damage occurs, the actuator device 1
It is possible to prevent the driver's cab 5 from twisting and falling on the second side, and also 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. This is an embodiment of the present invention, and FIG. 2 is a system diagram showing a conventional driver's cab lifting device. FIG. 3 shows a system diagram of an embodiment of the first invention of the present invention, which is an improved cab lifting device of FIG. 1, and FIG. 4 shows a second embodiment of the cab of the invention. An embodiment of a lifting device is illustrated by a system diagram. FIG. 5 shows a side view of a stopper used in the driver's cab lifting device, which is the third aspect of the present invention. The codes used in the examples are as follows: 1 and 7
: Actuators 1a and 7a; cylinder, lb and 7b = piston, IC11d, 7C and 7d: displacement chamber,
1e and 1f: check valve, 7e and 7f:
conduit. 2: Pilot check valve 2a: Pilot pipe line. 3 and 4: Pipeline 3a: Throttle channel. 5: M turntable 6: Chassis 6a: Claw. 8: /<- 8a: Pin, 8b: Teeth, 8d Nispring. Patent applicant Sanwa Seiki Co., Ltd. Representative Nishi 1 (n Etsushi)

Claims (1)

[Claims] 1. One actuator device includes: a: one piston is fitted into one cylinder bored in one actuator so as to be able to slide in the axial direction; b: said one cylinder in which one displacement chamber is formed on one side in the axial direction of the one piston, and the other displacement chamber is formed on the other side, c: a first chamber for pumping or discharging pressurized fluid; a pipe line 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 a pilot check valve, e: the pilot check a pilot pipe in the valve communicates with the first pipe; 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 bored in the other actuator so as to be able to slide in the axial direction, and b: in the other cylinder. , 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 the other cylinder d: The other displacement chamber in the other cylinder communicates with the other displacement chamber in the one cylinder, e: The other piston or the other cylinder communicates with the other displacement chamber in the driver's cab. The cab lifting device having the above structure, wherein the other cylinder or the other piston is connected to the chassis. 2. One of the actuator devices includes: a: one piston is fitted into one cylinder bored in one actuator so as to be able to slide in the axial direction; and b: in the one cylinder, one piston is fitted into one cylinder bored in the one actuator. One displacement chamber is formed on one side in the axial direction, and the other displacement chamber is formed on the other side, c: The first pipe line for pumping or discharging the pressure fluid is d: A second pipe line for discharging or pumping pressure fluid is connected to the other displacement chamber via a pilot check valve, and e: The pilot pipe line in the pilot check valve is connected to the other displacement chamber. communicating with a first pipe line; f: a first check valve and a second check valve are interposed in series between the other displacement chamber and the second pipe line; g: 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 having the above configuration, a: the other actuator The other piston is fitted into the other cylinder bored in the cylinder so as to be able to slide in the axial direction, b: In the other cylinder, one displacement chamber is provided on one side in the axial direction of the other piston. and another displacement chamber is formed on the other side, c: the first conduit communicates with one displacement chamber in the other cylinder, and d: the other displacement chamber in the other cylinder. a displacement chamber communicates between the first check valve and the second check valve; e: the other piston or the other cylinder is connected to the driver's cab; The other piston is connected to the chassis. The cab lifting device having the above configuration. 3. One of the actuator devices includes: a: One piston is fitted into one cylinder bored in one actuator so as to be able to slide in the axial direction; b: In the one cylinder, the one piston is fitted into one cylinder bored in the one actuator. One displacement chamber is formed on one side in the axial direction, and the other displacement chamber is formed on the other side, c: The first pipe line for pumping or discharging the pressure fluid is d: A second pipe line for discharging or pumping pressure fluid is connected to the other displacement chamber via a pilot check valve, and e: The pilot pipe line in the pilot check valve is connected to the other displacement chamber. communicating with a first pipe line; f: a first check valve and a second check valve are interposed in series between the other displacement chamber and the second pipe line; g: 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 having the above configuration, a: the other actuator The other piston is fitted into the other cylinder bored in the cylinder so as to be able to slide in the axial direction, b: In the other cylinder, one displacement chamber is provided on one side in the axial direction of the other piston. and another displacement chamber is formed on the other force side, c: the first conduit communicates with one displacement chamber in the other cylinder, and d: the other displacement chamber in the other cylinder. a displacement chamber communicates between the first check valve and the second check valve; e: the other piston or the other cylinder is connected to the driver's cab; The other piston has the above configuration, and is connected to the chassis, and when the driver's cab is lifted up, there is a space between the driver's cab and the chassis on the side where the other actuator device is interposed. The driver's cab lifting device having the above configuration includes a stopper that holds the driver's cab in that position.