JPH0632409Y2 - 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,
The control cylinder installed between the lower arm and one end of the stabilizer bar that is installed in the vehicle generates torsional torque according to the difference between the vertical movements of the left and right wheels and enhances the roll rigidity for the vehicle. Expansion control valve for selecting impossibility.

[Conventional technology]

The stabilizer mechanism as a suspension system in a vehicle is to increase the roll rigidity in the vehicle by the torsion torque of the stabilizer bar to improve the running stability of the vehicle, but the use of the above-mentioned stabilizer bar makes it possible to improve the overall suspension system in the vehicle. The spring constant 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, a control cylinder D provided between the lower arm A and one end of a stabilizer bar S, which is mounted on the vehicle and generates a torsion torque according to a difference between vertical movements of the left and right wheels T.
Is selected to enable or disable the expansion and contraction of the control cylinder D. If the expansion and 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 swells. It is possible to prevent in advance a situation in which, when traveling on a road surface, 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
And a principle structure of the expansion / contraction control valve as a means for selecting whether the expansion / contraction of the control cylinder D is possible or not.

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.

Further, in the above structure, the operation check valves Ca, C are arranged so that the control cylinder D can be smoothly expanded and contracted.
It is assumed that throttles Oa and Ob are provided in oil passages La and Lb that connect b and the accumulator Q, respectively.

[Problems to be solved by the invention]

However, in the expansion / contraction control valve structure of the control cylinder described above, there is a fear that a preferable riding comfort in a traveling vehicle or preferable traveling stability may not be obtained.

That is, in the expansion / contraction control valve structure of the conventional control cylinder, the oil passages La and Lb that allow the accumulator Q and the oil chambers Da and 1b in the control cylinder D to communicate with each other are respectively provided. Since the throttles Oa and Ob are provided, for example, when the control cylinder D is contracted, that is, when the hydraulic oil flows out from the pressure side oil chamber Db toward the accumulator Q and the extension side oil chamber Da. In addition, due to the throttle Oa upstream of the expansion side oil chamber Da, most of the hydraulic oil from the pressure side oil chamber Db is stored in the accumulator Q.
As a result, the hydraulic oil is inflowed into the inside of the expansion side oil chamber Da, resulting in insufficient inflow of the hydraulic oil into the expansion side oil chamber Da, causing cavitation (cavitation) due to insufficient inflow of the hydraulic oil into the expansion side oil chamber Da.

The cavitation phenomenon in the expansion side oil chamber Da causes a so-called insufficient reaction force when the control cylinder D is inverted and compressed, and therefore a desired smooth compression is performed when the control cylinder D is compressed. However, there is a fear that the ride comfort of the vehicle may be deteriorated because the body roll cannot be reduced due to the rigidity of the stabilizer bar S.

Further, if the control cylinder D is held in a so-called locked state in which expansion and contraction of the control cylinder D is prevented while the cavitation occurs, the compression is allowed when the control cylinder D tends to compress. Stabilizer bar S
Therefore, there is a fear that the roll rigidity due to the above may not be obtained, and the desired running stability in the vehicle may not be obtained.

Therefore, in view of the above-mentioned circumstances, the present invention is equipped with a stabilizer bar, and the hardness of the roll rigidity can be selected by a control cylinder so as to obtain a preferable riding comfort and running stability in a running vehicle. It is an object of the present invention to newly provide a telescopic control valve for the control cylinder.

[Means for solving 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 provided with one end of a stabilizer bar that generates a torsion reaction torque according to the difference between the vertical movements of the left and right wheels of the vehicle. In the expansion / contraction control valve that selects whether the expansion / contraction operation of the control cylinder arranged between the lower arm and the lower arm is possible, the expansion / contraction control valve is provided with a spring for the flow of hydraulic oil from the accumulator to the control cylinder. It is configured as a poppet-type operate check valve that consists of a poppet that compresses and allows it without resistance while blocking it in the opposite direction, and a push rod that forcibly pushes the poppet with external operating force. Then
Further, the push rod is configured to push open the poppet halfway when the poppet is pushed open by the push rod to form an orifice having a throttling effect between the poppet and the sleeve body which is the valve seat thereof. Is characterized by.

[Action]

As a result, when the push rod is operated to make the roll rigidity of the stabilizer bar flexible, the hydraulic oil in the pressure side oil chamber of the control cylinder is restricted by the orifice formed by the sleeve body and the poppet, and the expansion side The poppet will be opened wide enough to be sent to the oil chamber on the extension side without resistance.

As a result, the control cylinder performs a desired smooth operation even at the time of the next reversal, and secures a favorable riding comfort and traveling stability according to the traveling situation of the vehicle.

Further, when the control cylinder expands and contracts, pressure oil does not flow to the accumulator side more than necessary, so that it is not necessary to pressurize the accumulator, and therefore the durability of the accumulator is not impaired.

〔Example〕

 Hereinafter, the present invention will be described based on the illustrated embodiments.

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 axial center 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, as described above, in the cylinder portion 20, a pair of springs 25, 26 for positioning the piston body 21 in the neutral position of the piston stroke region in the cylinder portion 20 are housed. The springs 25 and 26 function to urge the piston body 21 from both directions, but the pair of springs 25 and 26 have a so-called double structure in the present embodiment. It is configured to have 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.
The piston body 21 when the opening is in the neutral position.
It is positioned so as to be closed at the outer periphery of.

A piston ring 21d biased by a backup ring 21c is provided at the center of the outer circumference of the piston body 21, and the piston ring 21d is connected to the oil passage La and the oil passage L.
The openings of b and the oil passage Lc are supposed to be 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.

The expansion / contraction control valves 1a and 1b respectively arranged in the oil passages La and Lb are formed in the same so-called poppet valve type as shown in FIG.

That is, the poppets 11a and 11b are vertically movably housed in the sleeve bodies 10a and 10b, which are the valve seats disposed in the housing H, and the poppets 11a and 11b are raised, that is, , When moving forward, the relevant poppets 11a, 11
Communication between the upstream side and the downstream side of b is blocked, and conversely, when the poppets 11a and 11b are descending, that is, moving backward, the communication is enabled.

The poppets 11a and 11b are springs 13a whose lower ends are locked to the upper surfaces of the cap members 12a and 12b screwed to the housing H so that the sleeve bodies 10a and 10b are fixed in the housing H. The upper ends of 13b are in contact with each other and are urged in the ascending direction, that is, the forward direction.

Incidentally, the respective poppets 11a, 11b are the respective sleeve bodies 10a, 10b.
Push rod 14a, which will be described later, when housed in
When retracted by 14b, that is, when the expansion / contraction control valve 1 is opened, it is housed so as to have a stroke that allows it to further retract due to the hydraulic action from the upstream side thereof.

Further, an annular groove is formed on the outer peripheral side surface of each of the sleeve bodies 10a, 10b, and an oil hole is formed in the thickness thereof, and the outer peripheral side and the inner peripheral side of the respective sleeve bodies 10a, 10b. And the annular groove is communicated with the oil passages La and Lb, respectively.

Push rods 14a, 1 are provided at the tips of the poppets 11a, 11b.
When the operating force F such as an artificial force is applied to the rear ends of the push rods 14a, 14b, the front ends of the push rods 4a are located close to each other, and the push rods 14a, 14b move forward (downward in the figure) to move the poppets 11a, 11b.
b is lowered by a predetermined amount.

The push rods 14a and 14b are slidably accommodated in the cap members 15a and 15b screwed to the housing H, and are biased in the ascending direction, that is, the retracting direction by the springs 16a and 16b. There is.

When the push rods 14a, 14b are moved downward when the push rods 14a, 14b are moved forward, the poppets 11a, 11b move in the respective springs 13a, 1b.
3b is slightly compressed and lowered only by a predetermined amount, and it is not lowered to the full stroke.

Angle members 30a and 30b are fixed to the upper ends of the push rods 14a and 14b, respectively, and the angles 30a and 30b are integrated by a connecting rod 31 so as to move up and down at the same time.

A bracket 32 is connected to the connecting rod 31, and a tip of an operation lever 34 is connected to a pin 33 inserted in the bracket 32.

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 operating lever 34 can be raised.

Therefore, in this embodiment, each expansion / contraction control valve 1a and 1b is
The push rods 14a, 14a,
14b moves forward, and the poppets 11a, 11b move backward by the forward movement of the push rods 14a, 14b, so that the poppets 11a, 11b exhibit a so-called open state, and when the artificial force F is released, the push rods 14a, 14b move. As the push rods 14a, 14b move backward, the poppets 11a, 11b move forward due to the backward movement of the push rods 14a, 14b, and function as check valves using the oil passages La, Lb as one-way flow passages.

And, as described above, each expansion / contraction control valve 1a, 1b is moved when the push rods 14a, 14b are moved forward, that is, each poppet 1
In the open state of 1a, 11b, each oil chamber 2 of the cylinder portion 20 which is a downstream side from an accumulator Q side which is an upstream side described later.
When pressure oil, that is, hydraulic oil, flows into the 3, 24 side,
The poppets 11a and 11b are further lowered and further opened.

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 communicates with the oil passages La and Lb and also communicates with the oil passage Lc, and the air chamber Q2 is formed in the cap member Q4 in the present embodiment. The inside of the air chamber Q2 is set to have a so-called atmospheric pressure, which is communicated with the outside through the opening Q5 provided.

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, and 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 hydraulic 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.

When the above hydraulic oil flows in and out, the expansion control valves 1a, 1b are
Operates as shown in FIG.

In FIG. 4, only the expansion / contraction control valve 1a is shown.

That is, when the expansion / contraction control valve 1a is in the open state, a so-called orifice O having a throttling effect is formed between the tip inclined surface of the poppet 11a and the lower end edge of the insertion opening of the push rod 14a provided in the sleeve body 10a. It is formed.

Therefore, when the hydraulic oil from the oil chamber 24 side passes through the orifice O and flows to the accumulator Q side (indicated by the arrow a in the figure), the orifice O acts as a so-called throttle, and a predetermined throttle effect is obtained. Will be obtained.

On the other hand, when the hydraulic oil from the accumulator Q side passes through the orifice O and flows to the oil chamber 24 side (indicated by the arrow b in the drawing), the hydraulic pressure thereof causes the poppet to move as shown by the broken line in the drawing. 11a overcomes the repulsive force of the spring 13a and is further lowered in the sleeve body 10, and as a result, the orifice O is largely opened, and not only the throttling effect is not generated but also the above-mentioned operation is performed. It will act to help the circulation of oil.

That is, the effect of opening the orifice O is exhibited.

Therefore, when the expansion / contraction control valves 1a, 1b are in the so-called open state, the control cylinder 2 is expanded / compressed smoothly, and cavitation is not generated in any of the oil chambers 23, 24. Become.

Then, the expansion and contraction of the control cylinder 2 allows the movement when there is a movement that changes the interphase distance between the axle side and the vehicle body side of the vehicle.

More specifically, for example, when the left and right wheels T on the front side 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 ride comfort in the vehicle is improved. Become.

On the contrary to the above, when each expansion / contraction control valve 1a, 1b functions as a so-called check valve, the flow of working oil from each oil chamber 23, 24 toward the accumulator Q is blocked. The stabilizer control cylinder 2
The expansion and contraction is blocked.

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 wheels T on the front side of the vehicle move up and down in opposite phases, the stabilizer bar S
Thus, the roll rigidity acts on the axle side, and the steering stability in the vehicle is improved.

(Effects of the Invention) As described above, according to the present proposal, 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 the push rod can be operated. Even when the roll rigidity of the stabilizer bar is made flexible, the operating oil in the pressure side oil chamber of the control cylinder is limited by the orifice formed by the sleeve body and the poppet, and the poppet on the expansion side is sufficient. Open to the end and feed it into the oil chamber on the extension side without resistance, thus exerting the advantage of ensuring a smooth ride when the control cylinder is reversed and ensuring a comfortable ride and running stability according to the running conditions of the vehicle. To get.

Further, in addition to the above, it is not necessary to pressurize the accumulator because pressure oil does not flow to the accumulator side more than necessary when the control cylinder expands and contracts, and therefore the durability of the accumulator is impaired. It is possible to give the advantage of not having.

[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, and FIG. 3 is a line II in FIG.
Partial sectional view indicated by I-III, FIG. 4 is a partially enlarged sectional view, FIG. 5 is a schematic perspective view showing a front state of a vehicle having a stabilizer bar and a control cylinder, and FIG. It is an explanatory view showing the principle of a control valve with a control cylinder. 1 (1a, 1b) ...... Expansion / contraction control valve 2 ...... Control cylinder 10a, 10b ...... Sleeve body 11a, 11b ...... Poppet 13a, 13b ...... Spring 14a, 14b ...... Push rod A ...... Lower arm O ...... Orifice Q …… Accumulator S …… Stabilizer bar T …… Wheels, La, Lb …… Oil passage

Claims (1)

[Scope of utility model registration request] 1. A control cylinder arranged between a lower arm and one end of a stabilizer bar that generates a torsional reaction torque according to a difference between vertical movements of left and right wheels of a vehicle, and whether or not the control cylinder can expand and contract. In the expansion control valve to be selected, the expansion control valve allows the flow of hydraulic oil from the accumulator to the control cylinder without causing resistance while compressing the spring, while blocking the flow in the opposite direction. It is configured as a poppet-type operate check valve consisting of a poppet to be pushed and a push rod that forcibly pushes the poppet with an external operating force, and the push rod pushes the poppet when the poppet is pushed open by the push rod. Push it halfway to form an orifice with a throttling effect between the poppet and its sleeve, which is the valve seat. Expansion control valve controlling cylinder, characterized in that configuration was.