JPH0620647Y2 - Telescopic control valve for control cylinder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a telescopic control valve for a control cylinder, and in particular,
A control cylinder installed between the lower arm and one end of a stabilizer bar, which is installed in the vehicle and generates a torsional torque according to the vertical movement difference between the left and right wheels to increase the roll rigidity for the vehicle, can be expanded or contracted. Regarding expansion control valve to be selected.

(Prior Art) A stabilizer mechanism as a suspension system in a vehicle enhances roll rigidity in the vehicle by the torsion torque of the stabilizer bar and improves running stability of the vehicle. The overall spring constant of the suspension system is increased, which may rather worsen the ride comfort of the vehicle.

Therefore, the applicant of the present application has proposed as shown in FIG. 5 as a means for preventing the deterioration of riding comfort as described above.

That is, the control cylinder D provided between the lower arm A and one end of the stabilizer bar S that is mounted on the vehicle and generates a torsion torque according to the vertical movement difference between the left and right wheels T is
If the expansion / contraction of the control cylinder D is allowed, the roll rigidity of the stabilizer bar S with respect to the vehicle is diminished, and the vehicle travels on a swell road surface. In this case, it is possible to prevent in advance a situation in which the vibration on the spring of the vehicle is increased and the riding comfort of the vehicle is deteriorated.

Then, as shown in FIG. 6, the control cylinder D
In addition, the principle structure of the expansion / contraction control valve has been proposed as a means for selecting whether the expansion / contraction of the control cylinder D is possible.

In this proposal, the expansion-side oil chamber Da and the compression-side oil chamber Db in the control cylinder D are communicated with the accumulator Q via oil passages La and Lb, respectively. Operated check valves Ca and Cb as expansion and contraction control valves are provided in La and Lb, respectively, and when the operated check valves Ca and Cb are opened by an external operating force F, the accumulator is operated. Q and the oil chambers Da and Db are in communication with each other, the working oil can flow freely between them, and the control cylinder D can be expanded and contracted.

When each of the above operation check valves Ca and Cb is returned to the so-called check valve state by releasing the external operating force F,
The hydraulic oil is prevented from flowing out from the oil chambers Da and Db, the oil chambers Da and Db are in an oil lock state, and the control cylinder D cannot be expanded or contracted.

Specifically, each of the above operation check valves Ca and Cb is
It is constructed as shown in FIG.

In the figure, only the operation check valve Ca is shown.

That is, the operating check valve Ca has a push rod P2 that opposes the poppet P1 and retracts the poppet P1 when moving forward to open the operating check valve Ca, but the push rod P2 is Housing H
The rod receiver P3, which is screwed into the shaft, penetrates through the shaft core of the rod receiver P3 and is held so as to be slidable in the axial direction, and the upper end of the spring P4 whose lower end is locked to the upper end of the rod receiver P3 is in contact with the upper end of the spring. It is touched and urged in the backward direction.

Therefore, when the operating force F from the outside that moves the push rod P2 in the forward direction (the direction to the left in the drawing) acts, the operating check valve Ca is opened, but the operating force F When the push rod P2 is released, the push rod P2 is retracted by the biasing force of the spring P4, the poppet P1 is moved forward and the operated check valve Ca is closed, that is, returned to the so-called check valve state. Will be.

Also, the push rod P2 moves forward, and the poppet
In the so-called open state in which P1 is retracted, the forward stroke of the push rod P2 is restricted by the annular contact surface P6 projectingly formed on the outer end surface of the valve seat P5 that slidably accommodates the poppet P1. It is supposed that the annular contact surface P6 is appropriately formed with a notch P7 to secure a flow path for the hydraulic oil.

Therefore, in order to open the operation check valve Ca (Cb), the push rod P2 should be advanced to the full forward stroke by utilizing the operating force F from the outside.

(Problems to be Solved by the Invention) However, the expansion / contraction control valve structure of the control cylinder described above has a problem in that it is installed in a vehicle and is restricted in its installation, or the product cost is increased. In addition, in some vehicle types equipped with the control cylinder D, it may be preferable to select the time when the operation check valve Ca (Cb) is opened.

That is, in the expansion and contraction control valve structure of the conventional control cylinder, the spring P4 for urging the push rod P2 in the returning direction is arranged outside the housing H, and therefore has the push rod P2. The expansion / contraction control valve, which is the operation check valve Ca (Cb), tends to have a large overall length, which is disadvantageous in that it is easily attached to a vehicle due to restrictions in its installation.

When the operating check valve Ca (Cb) is open,
Although the flow passage of the hydraulic oil is secured by the cutout P7 formed in the annular contact surface P6, since the cutout P7 is formed in the annular contact surface P6, it is not easy to secure a sufficient flow passage. However, it is indispensable to process the annular contact surface P6 and the notch P7, resulting in an increase in product cost.

Further, when the operating check valve Ca (Cb) is opened, that is, when the external operating force F is applied, the stabilizer bar S
The roll rigidity is reduced by this, and the riding comfort of the vehicle is improved, but in vehicles where running on a good road is prioritized in normal times, the open state of the operating check valve Ca (Cb) is prioritized. Therefore, in the case of the conventional proposal,
There is the inconvenience that the external operating force F must always be applied.

Therefore, in view of the above-mentioned circumstances, the present invention allows the control cylinder to select the hardness of the roll rigidity while equipping the stabilizer bar, and of course, it is difficult to receive the control on the mounting when the equipment is mounted on the vehicle. Further, it is an object of the present invention to newly provide a telescopic control valve for a control cylinder, which makes it possible to reduce the product cost and is optimal in a vehicle in which ride comfort is prioritized.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the structure of the expansion / contraction control valve of the control cylinder according to the present invention is installed in a vehicle and twisted according to the vertical movement difference between the left and right wheels. In an expansion / contraction control valve that selects expansion / contraction of a control cylinder arranged between one end of a stabilizer bar that generates torque and a lower arm, an oil that allows communication between the control cylinder and the accumulator The tip of a push rod, which is arranged in the passage and allows communication and interruption of the oil passage, is moved forward by the biasing force of the spring and is retracted by an operation force from the outside. A spring for urging the push rod in the forward direction is provided in a rod receiver that slidably inserts the push rod into the shaft core portion thereof, and It is characterized in that a stopper portion is formed on the portion so as to be locked to another portion when the push rod advances.

(Operation) Since the spring for urging the push rod is provided in the rod receiver that slidably inserts the push rod into the shaft core portion and is not projected to the outside, the entire length thereof is not unnecessarily increased. .

Further, since the forward stroke of the push rod is restricted by the stopper formed in the intermediate portion of the push rod positioned in the rod receiver, the so-called internal structure around the valve seat can be simplified.

Further, in a vehicle in which the ride comfort is prioritized during normal times, the external operating force acts only when necessary, and the roll rigidity by the stabilizer bar can be used.

(Embodiment) Hereinafter, the present invention will be described based on the illustrated embodiment.

FIG. 1 shows an expansion control valve 1 (reference numerals 1a and 1b in the figure) according to the present invention.
Shows a specific example of the control cylinder 2 integrally having the accumulator Q), and has a structure in which an accumulator Q is also integrally formed in an appropriate housing H constituting the control cylinder 2. ing.

First, the control cylinder 2 will be briefly described.

The control cylinder 2 has a piston body 21 slidably accommodated in a cylinder portion 20 formed in an appropriate housing H, and a base end of the rod body 22 connected by a piston nut 21a. Is protruded from the upper end side of the cylinder portion 20 to the outside, and the expansion side oil chamber 23 and the compression side oil chamber 24 are formed in the cylinder portion 20 by the piston body 21.
Springs 25 and 26 are housed therein, respectively, and urge the piston body 21 from both directions so as to neutralize the piston body 21 in the center of the cylinder portion 20.

In the housing H, oil passages La and Lb that allow the accumulator Q and the oil chambers 23 and 24 to communicate with each other are formed, and at the center of the cylinder portion 20, the inside of the oil passages La and Lb are formed. An oil passage Lc is provided to allow communication with the accumulator Q.

The expansion / contraction control valves 1a and 1b, which are operation check valves, are disposed in the oil passages La and Lb, respectively.

The lower end (right end in the figure) of the housing H has a mounting portion H1 for the lower arm A (see FIG. 5), and the upper end (left end in the figure) of the rod body 22 has a stabilizer bar S.
It has a mounting portion 22a (see FIG. 5).

The upper end side of the cylinder portion 20 is closed by mounting the cap member 20a, and the rod body 22 penetrates the shaft core portion of the cap member 20a.

An oil seal, a bearing, and the like are arranged on the inner peripheral side of the cap member 20a, and the inner peripheral surface of the cap member 20a is in sliding contact with the outer peripheral surface of the rod body 22.

A stopper 20b is provided on the inner bottom surface of the cylinder portion 20, and a stopper 21a is provided on the upper end surface of the piston body 21, so that the piston body 21 moves inside the cylinder portion 20. It is used as a stroke control means when sliding a large stroke.

Further, in the cylinder portion 20, a pair of springs 25, 26 for positioning the piston body 21 at the neutral position of the piston stroke region in the cylinder portion 20 are housed, and the respective springs 25, 26 functions to urge the piston body 21 from both directions,
In this embodiment, the pair of springs 25 and 26 are
It is configured to have a so-called double structure, and has separate springs 25a and 26a inside.

The oil passage La formed in the housing H is positioned so that the opening is closed by the outer circumference of the piston body 21 when the piston body 21 slides in the cylinder portion 20 to the position just before the extension. Has been drilled,
The oil passage Lb is positioned and drilled so that the opening is closed by the outer circumference of the piston body 21 when the piston body 21 slides in the cylinder portion 20 to the position immediately before bottoming.

Then, in the oil passage Lc, the piston body 21 is connected to the cylinder portion 20.
Is positioned so that its opening is closed by the outer circumference of the piston body 21 when in the neutral position.

A piston ring 21d urged by a backup ring 21c is provided at the center of the outer periphery of the piston body 21, and the piston ring 21d is connected to the oil passage La and the oil passage Lb.
And it is supposed that each opening of the oil passage Lc is closed.

Next, the expansion / contraction control valve 1 (indicated by reference numerals 1a and 1b in the drawing) according to the present invention will be briefly described.

As shown in FIG. 2, the expansion control valves 1a and 1b respectively arranged in the oil passages La and Lb are formed in the same so-called poppet valve type.

That is, the valve seats 10a, 10 arranged in the housing H
In b, the poppets 11a and 11b are respectively housed so as to be movable up and down, and the poppets 11a and 11b are raised, that is, when the poppets 11a and 11b are moving forward and downstream, The communication is blocked, and conversely, when the poppets 11a and 11b are descending, that is, moving backward, the communication is enabled.

The poppets 11a, 11b are the valve seats 10a, 10b.
Is fixed to the housing H, the upper ends of the springs 13a and 13b whose lower ends are locked are brought into contact with the upper surfaces of the respective cap members 12a and 12b screwed to the housing H so as to move upward, that is, to move forward. Is urged in the direction.

Incidentally, an annular groove is formed on the outer peripheral side surface of each of the valve seats 10a, 10b, and an oil hole is formed in the thick portion thereof, and the outer peripheral side and the inner peripheral side of the respective valve seats 10a, 10b. The annular groove is communicated with the oil passages La and Lb, respectively.

Further, the outer end surfaces of the respective valve seats 10a, 10b in the forward direction are not formed with the annular contact surface P6 (see FIG. 3) as in the above-mentioned conventional proposal, and the free flow of hydraulic oil is possible. Is allowed.

A push rod 14 is provided at the tip of each poppet 11a, 11b.
The tip ends of a and 14b are in contact with each other, and when an operating force F such as an artificial force is applied to the rear ends of the push rods 14a and 14b to move them backward (raise in the figure), the poppets 11 are removed.
The a and 11b are raised by a predetermined amount so as to close the openings formed in the valve seats 10a and 10b above them.

As shown in FIG. 3, the push rods 14a and 14b are provided with the rod receivers 15a and 15b screwed to the housing H, respectively.
Each of the springs 16 is slidably accommodated in the shaft core portion of each of the rod receivers 15a and 15b and is accommodated in the inner periphery of the shaft core portion of the rod receiver 15a, 15b.
They are urged by a and 16b in the descending direction, that is, the forward direction.

Rib-shaped stopper portions 17a, 17b are respectively formed in the intermediate portions of the push rods 14a, 14b, and the stopper portions 17a, 17b are formed in the rod receivers 15a, 15b.
Is in contact with the housing H to which is screwed, and is formed so as to regulate the forward stroke of each push rod 14a, 14b to a predetermined amount.

Angle members 30a and 30b are fixed to the rear ends of the push rods 14a and 14b, respectively, and the angle members 30a and 30b are integrated by a connecting rod 31 so as to simultaneously move up and down.

A bracket 32 is connected to the connecting rod 31, and the operation lever is connected to the pin 33 inserted in the bracket 32.
34 tips are connected.

Also, the operation lever 34 is pinned to a bracket 35 attached to the housing H, as shown in FIG.
It is supported by 36, and is connected to a connecting tool 38 via a pin 37 inserted at its rear end.

Further, a tension member 39 such as a wire is connected to the connecting member 38, and an operating force F such as an artificial force on the tension member 39 is applied.
By this action, the rear end of the operation lever 34 can be lowered.

Therefore, in this embodiment, each expansion / contraction control valve 1a and 1b is
Shows that each push rod 14a, 14b is moved forward by the biasing force of each spring 16a, 16b in each rod receiver 15a, 15b to move each poppet 1
1a and 11b are retracted and are in a so-called open state.

When the push rods 14a, 14b are moved forward,
Stoppers 17a and 17b formed in the intermediate portions of the push rods 14a and 14b are brought into contact with the housing H, which is another portion, and the stroke thereof is restricted.

And again, when the push rods 14a, 14b move forward,
The outer end surfaces of the valve seats 10a, 10b accommodating the respective poppets 11a, 11b are provided with annular contact surfaces (reference numeral in FIG.
(Refer to P6) is not formed, so the flow of hydraulic oil therethrough is not obstructed.

On the other hand, the expansion / contraction control valves 1a and 1b are operated by an operating force F such as an artificial force.
When the push rods 14a and 14b are operated, the push rods 14a and 14b move backward by being able to strike the biasing forces of the springs 16a and 16b in the rod receivers 15a and 15b, respectively, and the push rods 14a and 14b move backward to move the poppets 11a. , 11b move forward to function as a check valve using the oil passages La, Lb as one-way flow passages.

Accumulator Q installed in the housing H
As shown in FIG. 1, the oil chamber Q1 in the housing H is
And the air chamber Q2 so as to partition the air chamber Q2 from each other, and the outer peripheral edge of the rubber film Q3 is a cap member screwed to the housing H so as to isolate the air chamber Q2 from the outside.
It is established by Q4.

The oil chamber Q1 is in communication with the oil passages La and Lb, is also in communication with the oil passage Lc, and the air chamber Q2 is
In this embodiment, the air chamber is communicated with the outside through the opening Q5 formed in the cap member Q4.
The inside of Q2 is set to what is called atmospheric pressure.

Therefore, when the expansion / contraction control valves 1a, 1b are in the so-called open state, the accumulator is stored in the oil chamber 23 on the extension side as the piston body 21 descends in the cylinder portion 20 (rightward in FIG. 1). The hydraulic oil from the lator Q is sucked in, and the pressure side oil chamber 24
The hydraulic oil flows out from the inside toward the accumulator Q, so that the control cylinder 2 is contracted.

Further, contrary to the above, as the piston body 21 rises in the cylinder portion 20 (leftward in FIG. 1), the working oil from the accumulator Q is sucked into the oil chamber 24 on the pressure side, and The hydraulic oil flows out from the expansion side oil chamber 23 toward the accumulator Q, so that the stabilizer control cylinder 2 is expanded.

Therefore, when the expansion / contraction control valves 1a, 1b are in the so-called open state, the control cylinder 2 is expanded / contracted smoothly, and the expansion / contraction of the control cylinder 2 is performed on the axle side and the vehicle body side of the vehicle. When there is a movement that changes the inter-phase distance between and, the movement is allowed.

More specifically, for example, when the front left and right wheels T of the vehicle move up and down in opposite phases, the roll rigidity of the stabilizer bar S does not act on the vehicle body side, and the riding comfort in the vehicle is improved.

On the contrary to the above, when the expansion / contraction control valves 1a, 1b function as so-called check valves, the communication between the oil chambers 23, 37 and the accumulator Q is blocked. The stabilizer control cylinder 2 is in a state in which its expansion and contraction is prevented.

Therefore, the control cylinder 2 in which the expansion and contraction is blocked, like the link rod S1 (see FIG. 5) arranged between the other end of the stabilizer bar S and the lower arm A,
It will act as a so-called rod.

Therefore, for example, when the left and right vehicles T on the front side of the vehicle move up and down in opposite phases, the stabilizer bar S
As a result, the roll rigidity acts on the axle side, and the steering stability in the vehicle is improved.

[Effect of device]

As described above, according to the present invention, the roll rigidity of the stabilizer bar arranged between the left and right wheels of the vehicle can be selected to be hard or soft, and preferable ride comfort and running stability can be obtained according to the running condition of the vehicle. As a matter of course, it is possible to reduce the entire length of the equipment installed in the vehicle, and thus there is an advantage that it is less likely to be restricted by mounting.

Further, according to the present invention, there is an advantage that the outer end surface of the valve seat for accommodating the poppet does not need to be specially processed, which contributes to a low product cost.

Further, according to the present invention, in a vehicle in which running on a good road is prioritized during normal times, the ride comfort can be improved without applying an external operating force, and the external operating force acts only when necessary. The advantage is that the running stability of the vehicle can be improved.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG.
A sectional view taken along line II-II in the figure, FIG. 3 is a partially enlarged sectional view of FIG. 2, FIG. 4 is a sectional view taken along line IV-IV of FIG. 2, and FIG. 5 is a stabilizer bar. FIG. 6 is a schematic perspective view showing a front state of a vehicle having a control cylinder and a control cylinder, and FIG. 6 is an explanatory view showing in principle a telescopic control valve together with the control cylinder.
FIG. 7 is a partially enlarged sectional view showing a conventional example similar to FIG. 1 (1a, 1b) ... Expansion control valve 2 ... Control cylinder 10a, 10b ... Valve seat 11a, 11b ... Poppet 12a, 12b ... Cap member 13a, 13b ... Spring 14a, 14b ... Push rod 15a, 15b ... Rod receiver 16a , 16b ... Spring 17a, 17b ... Stopper part A ... Lower arm Q ... Accumulator S ... Stabilizer bar T ... Wheels, La, Lb, Lc ... Oil passage

Claims (2)

[Scope of utility model registration request] 1. A control cylinder arranged between a lower arm and one end of a stabilizer bar, which is installed in a vehicle and generates a torsion torque according to a vertical movement difference between left and right wheels, is selected to be expandable or contractable. In the expansion / contraction control valve, the poppet, which is arranged in the oil passage that allows communication between the control cylinder and the accumulator and allows communication and interruption of the oil passage, is advanced by the urging force of the spring and externally. The tips of the push rods that are retracted by the operating force from are opposed to each other, and the spring that urges the push rods in the forward direction is provided in the rod receiver that slidably inserts the push rod into the axial center portion thereof. In addition, a stopper portion is formed at an intermediate portion of the push rod so as to be locked to another portion when the push rod advances. Expansion control valve controlling cylinder, characterized. 2. A utility model as claimed in claim 1, wherein one end of the spring in the rod receiver is locked to the rod receiver and the other end is locked to a stopper portion formed in the intermediate portion of the push rod. The expansion / contraction control valve of the control cylinder according to the first aspect.