JP2003287077A - Lock cylinder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable to selection of an active/inactive of the predetermined stabilizer function and provide such a stabilizer on a large-sized vehicle. <P>SOLUTION: The cylinder body C is formed as a twin tube type, one end is connected to the fixed side and another end is connected to the movable side. The reservoir R functioning as an opening/closing valve, a check valve and an accumulator which constitute the control mechanism to enable selection of capability or incapability of expansion and contraction in the cylinder body C, is incorporated. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a lock cylinder mounted on a vehicle and connected to a stabilizer so that the life and death of the stabilizer function can be selected.

[0002]

2. Description of the Related Art As is well known, for example, when a vehicle that exhibits a rolling phenomenon by traveling on a sloping road is equipped with a stabilizer, the stabilizer function suppresses rolling of the vehicle, and The posture is properly controlled.

On the other hand, when the vehicle travels on a flat road,
Since the rolling phenomenon hardly occurs, it is more advantageous to reduce the stabilizer function in terms of riding comfort in the vehicle.

In addition, depending on the condition of the sloping road on which the vehicle travels, the stabilizer function may be exerted, which may worsen the riding comfort of the vehicle. In this case as well, it is better to reduce the stabilizer function. .

Therefore, it has been proposed to connect the lock cylinder to the stabilizer and to select whether the lock cylinder can be expanded or contracted so that the stabilizer function can be activated or deactivated.

For example, in the lock cylinder shown in FIG. 7, it is possible to freely select whether the cylinder body C can be expanded or contracted by switching control of the valve V in the control mechanism S disposed outside the cylinder body C. It will be.

Therefore, by changing the scale of the cylinder body C and, for example, the scale of the accumulator A in the control mechanism S, the lock cylinder can be used in both small and medium-sized vehicles and large vehicles. It can be said that it will be possible.

[0008]

However, in the above-mentioned proposed lock cylinder, even if the lock cylinder is embodied and mounted on a vehicle together with a stabilizer, it may be pointed out that this cannot be realized.

That is, although not shown, in the construction of the lock cylinder, it is assumed that the cylinder body C and the control mechanism S are separately formed, and both are connected by a pressure resistant hose, and the lock cylinder is mounted on the vehicle. When mounting the lock cylinder, since the part where the lock cylinder is mounted is a so-called underbody, it is highly likely that the lock cylinder will become unusable due to breakage of the pressure hose due to flying stones, etc. Become.

Therefore, it is preferable that the lock cylinder is integrally formed so that the control section S is held in the cylinder body C so as to embody the part shown in FIG. 7 as it is.

At this time, when the vehicle is a small or medium-sized vehicle, the expansion / contraction stroke of the cylinder body C is small, and
The accumulator A in the control unit S is also not large, and therefore there is little concern that the mountability on the vehicle will be reduced.

However, when the vehicle is a large-sized vehicle, the entire lock cylinder including the cylinder body C and the control section S is increased in size to increase the weight, which not only reduces the portability but also increases the vehicle weight. There is a risk of causing problems.

Not only when the vehicle is a large-sized vehicle, the expansion and contraction stroke of the cylinder body C will be large, and the accumulator A in the control unit S will be large.
Also becomes large, the tower mountability on the vehicle is extremely reduced,
In extreme cases, there is a danger that it will almost never be installed.

The present invention was devised in view of the above circumstances, and an object thereof is to make it possible to mount it on a small or medium-sized vehicle while making it possible to select the life and death of a predetermined stabilizer function. Of course, it is an object of the present invention to provide a lock cylinder that can be mounted on a tower even when the vehicle is a large-sized vehicle and is optimal for expecting an improvement in its versatility.

[0015]

In order to achieve the above-mentioned object, a lock cylinder according to the present invention comprises a cylinder body and a control mechanism for controlling expansion and contraction of the cylinder body. The cylinder body is a cylinder and a cylinder. A piston rod movably inserted into the cylinder through a piston, an expansion-side oil chamber and a compression-side oil chamber defined by the piston in the cylinder, and the expansion-side oil chamber and the compression-side oil formed in the cylinder through the piston. And a communication hole that is selectively opened and closed to and from the chamber,
The control mechanism connects or disconnects the expansion-side oil chamber and the compression-side oil chamber with an on-off valve, an accumulator connected to the communication hole, between the accumulator and the expansion-side oil chamber, and between the accumulator and the compression-side oil chamber. In a lock cylinder provided with first and second check valves that are respectively provided between them and allow only the flow of hydraulic oil from the accumulator, the opening / closing valve is provided in a piston or a piston rod, and the accumulator is provided. It is composed of a reservoir provided between a cylinder and an outer cylinder arranged outside the cylinder, the first check valve is provided in the head member of the cylinder, and the second check valve is provided in the cylinder. It is characterized in that it is provided in the bottom portion.

Therefore, when the piston is in the neutral position in the cylinder, the expansion-side oil chamber and the compression-side oil chamber in the cylinder communicate with the reservoir defined between the cylinder and the outer cylinder. It is not necessary to dispose an accumulator forming a control mechanism outside the cylinder body.

When the on-off valve is not opened, except when the piston is in the so-called neutral region,
The stabilizer function can be exhibited without the cylinder body expanding and contracting.

When the on-off valve is opened,
The stabilizer function can be diminished by allowing the cylinder body to freely expand and contract regardless of the position of the piston in the cylinder.

Further, as compared with the case where the cylinder body is integrally formed so as to hold the control mechanism, the outer diameter of the cylinder body does not need to be unnecessarily increased and the mountability on the vehicle is not deteriorated.

In the above construction, more specifically, the on-off valve is opened when a pilot signal supplied from the outside of the cylinder body is input and is closed by the spring force of the biasing spring when the pilot signal is released. It is assumed that the normally closed type is set.

Therefore, even if the pilot signal cannot be supplied due to various reasons such as an electrical failure, the on-off valve can be maintained in the closed state to ensure the minimum stabilizer function.

A seal ring is provided on the outer circumference of the piston and is in sliding contact with the inner circumference of the cylinder.
It is assumed that the effective width of the seal ring in the sliding direction of the piston is set to be smaller than the diameter of the communication hole formed in the cylinder.

Therefore, when the piston is in the neutral position in the cylinder, the seal ring does not close the communication hole, and therefore the communication between the expansion side oil chamber and the compression side oil chamber in the cylinder is maintained. To be done.

The seal ring is provided on the outer circumference of the piston and slidably contacts the inner circumference of the cylinder, and the inner circumference of the cylinder is formed with an annular groove communicating with a communication hole formed in the cylinder. It is assumed that the effective width of the annular groove in the axial direction of the cylinder is set to be larger than the effective width of the seal ring in the sliding direction of the piston.

Therefore, it is possible to reduce the diameter of the communication hole formed in the cylinder so as not to unnecessarily reduce the mechanical strength of the cylinder, and by setting the diameter of the communication hole to a small value, an orifice is formed in this communication hole. A function can be provided to control the flow velocity of oil that reciprocates between the expansion side oil chamber and the pressure side oil chamber in the cylinder and the reservoir chamber.

On the other hand, in order to prevent the gas in the gas chamber bordering the oil level in the reservoir from flowing into the extension side oil chamber in the cylinder through the opening end side of the cylinder body, the first means is adopted. The upper end has an inflow pipe which is suspended in the head member while opening in the oil with the lower end opening to the oil surface of the reservoir, and the inner passage of the inflow pipe is disposed in the head member. It is assumed that the check valve communicates with the expansion-side oil chamber in the cylinder.

In the second means, the inner cylinder is provided between the outer cylinder and the cylinder, and the cylindrical passage between the inner cylinder and the cylinder is connected to the cylinder through a communication hole formed in the cylinder. It communicates with the inside and also communicates with the reservoir through another communication hole formed in the inner cylinder, and further communicates with the expansion side oil chamber in the cylinder through the first check valve provided in the head member. Suppose In this case, the cylinder may be placed laterally and each communication hole may be provided at the lower ends of the cylinder and the inner cylinder.

In the third means, the lower end of the outer peripheral side of the head member is cut off to form a space between the head member and the opening end of the outer cylinder, and the oil surface of the reservoir is present in this space. In this state, a gas chamber with the oil level in the reservoir as a boundary is defined in this space.

Further, in each of the above means, the first and second
It is preferable that the check valve is composed of a non-return valve, a leaf spring that biases the non-return valve in the closing direction, and a stop member that supports the leaf spring.

[0030]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below based on the illustrated embodiments. The lock cylinder according to the present invention is as shown in FIGS. 1, 2, 3 and 4.
Basically, it is formed in a so-called multi-cylinder type hydraulic cylinder.

However, in the lock cylinder according to the present invention, the control mechanism S that allows the expansion / contraction of the cylinder body C to be selectable in the cylinder body C.
It is characterized in that (see FIG. 7) is incorporated.

The cylinder body C is, for example, one end connected to a fixed side, which is the vehicle body side, and the other end connected to a movable side, which is the stabilizer side. Is formed in.

The cylinder 1 defines the expansion side oil chamber R1 and the compression side oil chamber R2 with the piston 3 slidably housed inside, and the outer cylinder 2 is arranged on the outer peripheral side of the cylinder 1. A reservoir R as an accumulator is defined between the cylinder 1 and the cylinder 1.

At this time, in the reservoir R, a gas chamber G which is an air chamber is defined with the oil surface O as a boundary, and the oil surface O rises and the pressure of the gas chamber G rises. Therefore, it is said that a predetermined spring force is exerted. The reservoir R may be pressurized with gas pressure in advance.

Further, the open end which is the upper end in the figure of the cylinder body C is sealed with a head member 4 in the drawing, and the head member 4 is filled with oil from the reservoir chamber R. A first check valve 5 that allows the inflow to the expansion side oil chamber R1 but prevents the reverse flow is arranged.

The tip end of the piston rod 6 penetrating the shaft core of the head member 4 at the lower end in the drawing is connected to the piston 3 slidably accommodated in the cylinder 1. .

By the way, the opening end of the cylinder body C is not sealed by the above-mentioned head member 4, but is not shown, but at a head portion continuous to the opening end of the cylinder 1 as a head member, or It may be closed by a head portion continuing to the open end of the outer cylinder 2, and in that case, although not shown, the piston rod 6 is connected to the cylinder 1,
Alternatively, the head portion of the outer cylinder 2 is penetrated.

The bottom end, which is the lower end of the cylinder body C in the figure, is sealed with a bottom member 7 in the drawing, and this bottom member 7 has a pressure side of the oil from the reservoir R. A second check valve 8 is arranged which allows the inflow into the oil chamber R2 but prevents the backflow thereof.

Incidentally, the bottom end of the cylinder 1 is not sealed by the above-mentioned bottom member 7, but is not shown, but at a bottom portion continuous with the bottom end of the cylinder 1 as another bottom member, or It may be closed at the bottom of the outer cylinder 2, and in that case, although not shown, the check valve 8 is arranged at the bottom of the cylinder 1 or the outer cylinder 2. Become.

On the other hand, in the cylinder body C, the expansion side oil chamber R1 and the pressure side oil chamber R2 in the cylinder 1 can communicate with each other through an opening / closing valve V distributed to the piston 3 as shown in the figure. Has been done.

The on-off valve V is a cylinder body C.
It is set to a normally closed type that is opened when a pilot signal supplied from the outside is input and is closed by the spring force of the biasing spring V1 when the pilot signal is released.

At this time, the on-off valve V has a communication position V2 which is switched by the input of the pilot signal and a shut-off position V3 which is switched by the spring force of the biasing spring V1 when the pilot signal is canceled.

Therefore, in the on-off valve V, even when the pilot signal from the outside cannot be supplied, the shut-off position V3 is maintained and the cylinder body C is maintained in the so-called locked state. Therefore, at the minimum, the stabilizer function can be guaranteed.

When the on-off valve V is at the communication position V2, the on-off valve V allows the extension-side oil chamber R1 and the compression-side oil chamber R2 in the cylinder 1 to communicate with each other. The stabilizer function is diminished by maintaining C in a state where it can be expanded and contracted at all times.

When the on-off valve V is in the shut-off position V3, it prevents the extension-side oil chamber R1 and the compression-side oil chamber R2 in the cylinder 1 from communicating with each other, and therefore the cylinder body The expansion and contraction of C is blocked to form a rod-shaped body, and the stabilizer function is exhibited.

By the way, in a specific embodiment, the on-off valve V is not arranged on the piston 3 as shown in the drawing, but is not shown in the drawing, but is connected to the piston 3. It will be arranged at the tip of the rod 6, particularly near the tip of the piston rod 6 for connecting the piston 3 thereto.

Regarding the pilot signal supplied from the outside to the on-off valve V, the pressure is air pressure or hydraulic pressure, etc., in the figure. The valve V may have a solenoid, and the pilot signal may be electric power for exciting the solenoid, and the pilot signal may be input from an acceleration sensor or the like mounted on the vehicle.

By the way, in the cylinder body C, the cylinder 1 is formed in the cylinder 1 so that the inside of the cylinder 1 and the reservoir R can communicate with each other.
Inside the piston 3 when it is in the neutral position
Have communication holes 1a facing each other with a gap therebetween.

At this time, as shown in the drawing, the piston 3 has a seal ring 9 which is interposed on the outer periphery thereof and is in sliding contact with the inner periphery of the cylinder 1, and the piston 3 in the seal ring 9 which is in the vertical direction in the drawing. The effective width in the sliding direction is smaller than the diameter of the communication hole 1a formed in the cylinder 1.

Therefore, in the cylinder body C, when the piston 3 is in the neutral position in the cylinder 1, the extension side oil chamber R1 and the pressure side oil chamber R2 in the cylinder 1 are connected to the reservoir R via the communication hole 1a. It will be in a state of communicating with.

When the piston 3 slides in the cylinder 1, the piston 3 can slide in the cylinder 1 until the seal ring 9 cannot face the communication hole 1a.

Further, the seal ring 9 is connected to the communication hole 1a.
When it becomes impossible to face the above, the oil in the expansion side oil chamber R1 or the compression side oil chamber R2 cannot flow out to the reservoir R, and the cylinder body C cannot expand or contract, and at this time, the cylinder lock state is exhibited. .

Incidentally, in FIG. 1, FIG. 2 and FIG. 3, it is assumed that the communication hole 1a communicates with the annular groove 1b formed in the inner circumference of the cylinder 1. At this time, the outer circumference of the piston 3 The effective width of the annular groove 1b in the axial direction of the cylinder 1, which is the vertical direction in the drawing, may be set to be larger than the effective width of the interposed seal ring 9.

As a result, when the piston 3 is in the neutral position in the cylinder 1, the communication between the extension side oil chamber R1 and the pressure side oil chamber R2 to the reservoir R via the communication hole 1a is improved. become.

When the communication hole 1a is communicated with the annular groove 1b, the diameter of the communication hole 1a can be set small, and therefore, the mechanical strength of the cylinder 1 can be prevented from being unnecessarily reduced.

When the diameter of the communication hole 1a is set to be small, the communication hole 1a can be provided with an orifice function. Therefore, the expansion side oil chamber R1 and the pressure side oil chamber in the cylinder 1 can be provided. It is possible to control the flow rate of oil that reciprocates between R2 and the reservoir chamber R.

By the way, in the place shown in FIG.
An arc-shaped groove 1c is used instead of the above-mentioned annular groove 1b. At this time, this arc-shaped groove 1c is the above-mentioned annular groove 1c.
It has the same shape as b, and has the above-mentioned annular groove 1b.
It is set up to work like.

In the cylinder body C formed as described above, the open / close valve V can be freely expanded and contracted by opening the open / close valve V as described above, while the open / close valve V is not opened. Therefore, the expansion / contraction operation can be suppressed except when the piston 3 in the cylinder 1 is in the so-called neutral region. Therefore, the stabilizer in the stabilizer in which the cylinder body C is linked by the switching control of the opening / closing valve V. It will be possible to control the life and death of the function.

At this time, as in the above-mentioned conventional proposal shown in FIG. 7, the open / close valve V constituting the control mechanism S is the same, but the accumulator A functioning as a reservoir is disposed outside the cylinder body C. In comparison with the above description, in the present invention, the on-off valve V, the first and second check valves 5 and 8, and the reservoir R that is an accumulator are arranged in the cylinder body C. Negative effects caused by connecting an on-off valve V and an accumulator A to C, and further connecting a pipeline consisting of a pressure-resistant hose, and arranging the first and second check valves 5 and 8 in this pipeline , For example, to increase the outer diameter of the lock cylinder as a whole,
This prevents the malfunction due to the flow path resistance and the complication of the entire structure.

In the present invention, the head member 4 for axially sealing the open end of the cylinder body C has the first check valve 5, and the bottom member 7 for closing the bottom end of the cylinder body C is provided. It is supposed to have the second check valve 8.

At this time, as shown in FIGS. 1, 2 and 3, when the cylinder body C is of the upright type, the gas in the gas chamber G bordering the oil surface O in the reservoir chamber R is the cylinder body C. Through the open end side which is the upper end side of the cylinder 1
The device is designed to prevent it from flowing into the expansion side oil chamber R1.

By the way, in the cylinder body C shown in FIG. 4, when this is used in a horizontally placed state,
The gas in the gas chamber G bordering the oil surface O in the reservoir chamber R enters the extension side oil chamber R1 in the cylinder 1 through the opening end side of the cylinder body C, and also passes through the bottom end side of the cylinder body C. It is devised so that it cannot flow into the pressure side oil chamber R2 in the cylinder 1.

That is, in the cylinder body C shown in FIG. 1, the inflow pipe 1 is suspended at the upper end by the head member 4 while the lower end opens into oil bounded by the oil surface O in the reservoir R.
0, and the passage L which is the inner side of the inflow pipe 10 is communicated with the extension side oil chamber R1 in the cylinder 1 through the first check valve 5 arranged in the head member 4. .

As a result, the oil containing the gas from the reservoir R, which is not in danger, flows through the passage L formed by the inflow pipe 10, and the oil mixed with the gas flows into the expansion side oil chamber R1. The defect can be eliminated.

Next, in the cylinder body C shown in FIG. 2, the inner cylinder 11 is provided between the reservoir R and the cylinder 1, and the cylindrical passage L1 which is the inner side of the inner cylinder 11 has the cylinder 1 It communicates with the inside of the cylinder 1 through the communication hole 1a formed in the above, and also communicates with the extension side oil chamber R1 within the cylinder 1 through the first check valve 5 arranged in the head member 4.

Incidentally, in this embodiment, the tubular passage L
1 communicates with the reservoir R via a communication hole 11a formed in the inner cylinder 11.

Therefore, in the case of this embodiment, the dangerous oil containing the gas from the reservoir R flows into the cylindrical passage L1 through the communication hole 11a, and the communication hole is formed. However, it is possible to eliminate the problem that oil mixed with gas flows into the expansion side oil chamber R1 or the compression side oil chamber R2 though 1a.

In the cylinder main body C shown in FIG. 3, the outer peripheral lower end side of the head member 4 is cut off to form a space (not shown) between the open end side of the outer cylinder 2. At the same time, the oil surface O of the reservoir R is made to exist in this space portion, and a gas chamber G is defined in the space portion with the oil surface O of the reservoir R as a boundary.

Therefore, in the case of this embodiment, the open end of the passage (not shown) in which the gas chamber G bordering the oil surface O in the reservoir R is provided with the first check valve 5 is opened. Therefore, it is possible to eliminate the problem that oil mixed with gas flows into the expansion side oil chamber R1 via the check valve 5.

Further, in the cylinder body C shown in FIG. 4, it is assumed that the cylinder body C is set for horizontal use. Basically, the cylinder body C shown in FIG. It is almost the same as used.

However, since it is assumed that the tank is used in a horizontal position, the oil mixed with the gas in the gas chamber G does not flow into the expansion side oil chamber R1 and the compression side oil chamber R2 due to the disturbance of the oil surface O in the reservoir R. It is important to pay attention to the following.

Therefore, in the illustrated place, the cylinder 1
The communication hole 1a formed on the inner side of the cylinder 1 is positioned on the lower end side of the horizontally placed cylinder 1, while it is formed on the inner cylinder 11 that is present in the reservoir R and defines the cylindrical passage L1 between the cylinder 1 and the cylinder 1. It is supposed that the communication hole 11a for communicating the tubular passage L1 with the reservoir R is positioned at the lower end side of the laterally placed inner cylinder 11.

The first check valve 5 arranged on the head member 4 is positioned on the lower end side of the horizontally arranged head member 4, and the second check valve 5 is arranged on the bottom portion or the bottom member 7. The check valve 8 is positioned on the lower end side of the horizontally placed bottom member 7.

By the way, at this time, the notch hole 7a formed in the bottom member 7 to allow the reservoir chamber R and the check valve 8 to communicate with each other is formed only on the lower end side of the horizontally placed bottom member 7. It

From the above, as far as the so-called level is concerned, unless the oil is positioned in the oil below the oil level O and mixed with gas, the oil mixed with gas is allowed to flow into the expansion side oil chamber R1 or the compression side oil chamber R2. Needless to say, the communication holes 1a and 11a and the check valves 5 and 8 do not have to be positioned at the so-called lower end or lower end side.

If the communication hole 1a is always positioned at the lower end of the cylinder 1 as shown in the drawing, the inner cylinder 11 may be omitted.

Therefore, in the case of this embodiment, in the reservoir R, the gas chamber G having the oil surface O as a boundary is formed above the horizontally arranged inner cylinder 11, and therefore, the gas is not mixed. The oil in the cylindrical passage L1 which is not feared flows into the expansion side oil chamber R1 through the communication hole 1a, and the oil from the reservoir R in which gas is not feared flows into the pressure side oil chamber R2.

In the above description, the cylinder body C constituting the lock cylinder is so-called one-rod type, but from the point of view of the present invention,
Instead of this, although not shown, the cylinder body C may be of a so-called double rod type.

When the cylinder body C is of a double rod type, the pressures in the expansion side oil chamber R1 and the compression side oil chamber R2 defined in the cylinder 1 by the piston 3 become the same, and therefore the operation is performed. In addition to the advantages that the characteristics are the same, the installation of a reservoir for functioning as an accumulator can be omitted as long as the temperature can be guaranteed, and thus the outer diameter of the cylinder body C can be further reduced. There is.

FIGS. 5 and 6 show a concrete embodiment corresponding to the lock cylinder shown in FIG. 2, which will be described in detail below. Members provided in the lock cylinder shown in FIG. The same members as those in FIG.

The lock cylinder A is connected to the vehicle body side and the stabilizer side via upper and lower ball studs B1 and B2.

This lock cylinder A has a cylinder body C.
And a control mechanism for controlling expansion and contraction of the cylinder body C.

The cylinder body C includes a cylinder 1, a piston rod 6 movably inserted into the cylinder 1 via a piston 3, an expansion side oil chamber R1 and a compression side oil chamber defined by the piston 3 in the cylinder 1. R2 and the expansion side oil chamber R1 and the compression side oil chamber R formed on the cylinder 1 through the piston 3
2 and a communication hole 1a that is selectively opened and closed.

The control mechanism includes an opening / closing valve V which connects or disconnects the expansion side oil chamber R1 and the compression side oil chamber R2, and the communication hole 1a.
A reservoir R, which is an accumulator connected to the accumulator, is provided between the accumulator and the expansion side oil chamber R1 and between the accumulator and the compression side oil chamber R2, respectively, and allows only the flow of hydraulic oil from the accumulator. The first check valve 5 and the second check valve 8 are provided.

In this case, the open / close valve V is provided in the piston 3, and the accumulator is provided between the cylinder 1 and the outer cylinder 2 provided outside the cylinder 1 so as to provide a pressurized reservoir.
The first check valve 5 is provided in the head member 4 of the cylinder 1, and the second check valve 8 is provided in the bottom member 7 of the cylinder 1.

The piston rod 6 has a swivel joint 20.
The swivel joint 20 is connected to the upper ball stud B1 via a plate 22 for supporting the boot 21 arranged on the outer circumference of the piston rod 6 and the piston rod 6.
It is sandwiched in collaboration with.

The on-off valve V in the piston 3 comprises a poppet type valve body for opening and closing the oil passage 23 and a spring V1.
This valve body is in contact with a control rod 24 inserted in the piston rod 6 so as to be vertically movable.

The upper end of the control rod 24 is a spool 25 movably inserted into the upper end of the piston rod 6.
The upper end pressure chamber 26 of the spool 25 communicates with a port 27 provided in the swivel joint 20 and an oil passage 28.

Therefore, when air pressure or hydraulic pressure is supplied to the port 27 from the outside, the spool 25 and the control rod 24 descend, the valve body opens the oil passage 23, and when the supply of the pressure is stopped, the valve is restored by the restoring force of the spring V1. The body returns and oil passage 23
Close.

As shown in FIG. 6, the first and second check valves 5 and 8 are non-return valves 3 for opening and closing the mouth ends of oil passages 29 and 30 formed in the head member 4 and the bottom member 7, respectively.
0, a leaf spring 31 that biases the non-return valve 30 in the closing direction, and a stopper member 32 that supports the leaf spring 31.

The guide surface 33 and the step portion 34 are formed on the inner circumference of the upper and lower ends of the cylinder 1, and the non-return valve 30 is formed.
The leaf spring 31 and the stopper member 32 are vertically movably inserted along the guide surface 33, and the lower end thereof is supported by the step portion 34. Other actions and effects are shown in FIG.
It is the same as the lock cylinder of.

[0092]

As described above, according to the first and second aspects of the present invention, the expansion / contraction of the cylinder body can be controlled by the operation of the opening / closing valve, and therefore, the activation / deactivation of the stabilizer function in the stabilizer to which the cylinder body is linked. Can be controlled freely.

Since the on-off valve which constitutes the control section and the reservoir which functions as an accumulator are arranged in the cylinder body, the cylinder body is connected to a conduit consisting of a pressure resistant hose, and To prevent adverse effects due to the distribution of check valves, for example, to increase the outer diameter of the lock cylinder as a whole, to prevent it from malfunctioning due to flow path resistance, and to complicate the overall structure. Become.

According to the second aspect of the invention, the stabilizer function can be guaranteed at a minimum even when the pilot pressure cannot be supplied from the outside.

Further, according to the third aspect of the invention, when the piston is in the neutral position in the cylinder, the seal ring does not close the communication hole. Therefore, the expansion side oil chamber and the compression side oil chamber in the cylinder are not closed. The communication with the reservoir chamber is maintained.

Further, in the invention of claim 4, the diameter of the communication hole formed in the cylinder can be reduced so as to prevent the mechanical strength of the cylinder from being unnecessarily lowered, and the communication hole can be prevented. By setting the diameter of the valve to be small, it is possible to provide the communication hole with an orifice function and control the flow velocity of the oil that reciprocates between the expansion side oil chamber and the pressure side oil chamber in the cylinder and the reservoir chamber.

Further, in the inventions of claims 1, 2 and 3, when the cylinder body is an upright type, the gas in the gas chamber bordering on the oil level in the reservoir chamber is located at the upper end side of the cylinder body. Therefore, it will not be possible to flow into the extension side oil chamber in the cylinder via the opening end side that becomes.

Furthermore, in the invention of claim 4, when the cylinder body is used horizontally, the oil which is not a danger of gas mixture flows into the expansion side oil chamber, and there is a risk of gas mixture. The unretained oil will flow into the pressure side oil chamber.

As a result, according to the present invention, it is of course possible to mount a small or medium-sized vehicle on the tower while making it possible to select the life and death of the predetermined stabilizer function. It will also be possible to install it on the tower, which is ideal for expecting improvement in its versatility.

Further, according to the ninth aspect of the present invention, the displacement changing position of the stopper member becomes the stroke of the cylinder, and as a result, the mounting length can be shortened. Further, even if the stopper member is pushed up, the stopper member and the leaf spring only overlap each other in a plane with respect to the non-return valve, so that a large load can be endured.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional view showing a lock cylinder according to an embodiment of the present invention.

FIG. 2 is a view showing a lock cylinder according to another embodiment similar to FIG.

FIG. 3 is a view showing a lock cylinder according to still another embodiment, similar to FIG. 1.

FIG. 4 is a view showing a lock cylinder according to still another embodiment similarly to FIG. 1.

FIG. 5 is a vertical sectional front view of a lock cylinder according to a specific embodiment of the present invention.

6 is an enlarged cross-sectional view of the check valve of FIG.

FIG. 7 is a schematic vertical cross-sectional view partially showing a circuit diagram of a lock cylinder as a conventional example.

[Explanation of symbols]

1 cylinder 1a, 11a communication hole 1b annular groove 1c circular arc groove 2 outer cylinder 3 pistons 4 head members 5,8 Check valve 6 piston rod 7 Bottom member 9 seal ring 10 Inflow pipe 11 inner cylinder A accumulator C cylinder body G gas chamber L, L1 passage O oil level R reservoir R1 Extension side oil chamber R2 pressure side oil chamber S control unit V open / close valve V1 bias spring V2 communication position V3 cutoff position

─────────────────────────────────────────────────── ─── Continued Front Page (51) Int.Cl. ⁷ Identification Code FI Theme Coat (Reference) F16F 9/32 M

Claims (9)

[Claims] 1. A cylinder main body and a control mechanism for controlling expansion and contraction of the cylinder main body. The cylinder main body is partitioned into a cylinder, a piston rod movably inserted through a piston in the cylinder, and a piston in the cylinder. The expansion side oil chamber and the compression side oil chamber, and a communication hole that is formed in the cylinder and is selectively opened and closed by the expansion side oil chamber and the compression side oil chamber via a piston. An on-off valve that connects or disconnects the oil chamber and the pressure side oil chamber, an accumulator connected to the communication hole, and an accumulator and the extension side oil chamber, and an accumulator and the pressure side oil chamber, respectively. In a lock cylinder provided with first and second check valves that allow only the flow of hydraulic oil from an accumulator, the opening / closing valve is provided in a piston or a piston rod, and the accumulator is provided. The mulator is composed of a reservoir provided between the cylinder and an outer cylinder arranged outside the cylinder,
A lock cylinder, wherein the first check valve is provided in a head member of a cylinder, and the second check valve is provided in a bottom portion of the cylinder. 2. The normally open type opening / closing valve is opened when a pilot signal supplied from the outside of the cylinder body is input and is closed by a spring force of an urging spring when the pilot signal is released. The lock cylinder described in 1. 3. A seal ring is provided on the outer circumference of the piston and slidably contacts the inner circumference of the cylinder, and the effective width of the seal ring in the sliding direction of the piston is smaller than the diameter of the communication hole. The lock cylinder according to claim 1, wherein the lock cylinder is set as follows. 4. A seal ring, which is provided on the outer circumference of the piston and is in sliding contact with the inner circumference of the cylinder, and an annular groove communicating with the communication hole is formed on the inner circumference of the cylinder. The effective width in the axial direction of the seal ring is set to be larger than the effective width in the sliding direction of the piston in the seal ring.
Lock cylinder described in. 5. An inflow pipe, the lower end of which is opened in the oil bordering the oil surface of the reservoir, and the upper end of which is suspended by the head member, and a passage which is an inner side of the inflow pipe has a first reverse direction. The lock cylinder according to claim 1, wherein the lock cylinder communicates with an expansion side oil chamber in the cylinder via a stop valve. 6. An inner cylinder is provided between the outer cylinder and the cylinder, and a cylindrical passage between the inner cylinder and the cylinder communicates with the inside of the cylinder through a communication hole formed in the cylinder. The lock cylinder according to claim 1, wherein the lock cylinder communicates with the reservoir through another communication hole formed in the cylinder, and further communicates with the expansion side oil chamber through a first check valve provided in the head member. . 7. The lock cylinder according to claim 6, wherein the cylinders are arranged horizontally and each communication hole is provided at the lower end of the cylinder and the inner cylinder. 8. The head member has an outer peripheral lower end side cut off to form a space between the head member and the opening end side of the outer cylinder, and the oil surface of the reservoir is made to exist in the space, and the space is formed. The lock cylinder according to claim 1, wherein a gas chamber is defined at a portion of the reservoir with an oil surface of the reservoir as a boundary. 9. A non-retarding valve for opening and closing an opening end of an oil passage formed by the first and second check valves, respectively, and a leaf spring for urging the non-return valve in a closing direction. A stopper member that supports the leaf spring and is vertically movably disposed on the inner circumference of the end portion of the head member and the bottom member.
The lock cylinder described in 2, 3, 4, 5, 6 or 7.