JPH0478338A - Damping force adjustment type hydraulic buffer - Google Patents

Abstract

PURPOSE:To lessen current comsumption and ensure driving stability by supplying large current to a solenoid, based on a damping force switching signal to soft characteristic, to open a valve body, and changing current to weak one to be supplied after the fulfillment of a given condition is judged. CONSTITUTION:When a by-pass passage 9 is opened, since a valve body 29 is energized with a coil spring 31, force movable against the energized force is required, and large current is supplied to a solenoid 35 from an electric circuit 38. As shown in the left half of the figure, a plunger 34 is pulled up and the valve body 29 is separated from a valve seat 27 to open the by-pass passage 9. When the plunger 34 is pulled up and the fulfillment of a given condition, showing the abutting to a base 36, is judged with a judging means, the plunger 34 is attracted to the base 36 and its position can be retained by even small current, therefore current supplied from the electric circuit 38 is changed into weak current.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a damping force adjustable hydraulic shock absorber used in vehicles such as automobiles.

(Prior Art) Conventionally, hydraulic shock absorbers used in vehicles, etc. have been designed to improve ride quality depending on road conditions and running conditions. ! Or, there is one that allows the damping force to be adjusted appropriately to improve steering stability.

As this type of damping force adjustable hydraulic shock absorber, y publication 59
As disclosed in Japanese Publication No. 22'159 and Japanese Utility Model Publication No. 17477, two compartmented chambers are communicated through a plurality of passages, and the passages are formed by sliding a piston in a cylinder. Some systems are equipped with a damping force generating mechanism (for example, an owerfiss) that controls the flow of oil produced within the damping force to generate a damping force, and the damping force can be adjusted by opening and closing the passage using a solenoid valve.

The electromagnetic valve for opening and closing the passage has a structure in which a valve body which is biased by a spring or the like to block the passage is drawn in by supplying power to a solenoid to open the passage.

(Invention or problem to be solved) However, in the above hydraulic shock absorber, the electromagnetic J's 11
In order to obtain the damping force when the body is open, the solenoid must continue to be loaded with weight to prevent the valve body from being returned by the passenger, and the electricity stored in the battery is continuously consumed. There was a problem that if it continued for a long time, it would cost 1.

Therefore, in order to solve this problem, a damping force adjustment formula h1 was proposed by the applicant in Japanese Patent Application No. 101217.
There is a 1-pressure buffer. This damping force adjustment valve is a self-holding type, and by combining a permanent magnet with the solenoid valve, even when power is supplied to the solenoid, the plunger is held by the permanent magnet and the valve body is moved to the closed position. Alternatively, the valve can be stopped at the valve opening position t, which can significantly reduce power consumption.

By the way, if the power supply to the solenoid valve is cut off due to disconnection of the damping force adjustable hydraulic shock absorber while fishing on a boat, etc. 1- If you are unable to open or close the Jr. It is better to change it to damping force or heart characteristic (valve closed state) because it is necessary to do so.

However, with the above-mentioned self-holding damping force adjustable hydraulic release device, if the power supply is cut off due to a disconnection etc. when the damping force is in a small soft characteristic (open jF state), the damping force will change to the soft state. This may cause the problem that the data will remain retained.

The Kibatsu 1J was developed in view of the above 9 problems, and its purpose is to reduce the current consumption and to reduce the damping force, which becomes a large heart characteristic when the power supply is stopped due to disconnection, etc. The purpose of the present invention is to provide an adjustable hydraulic shock absorber.

(Means for solving the problem) The wood generator 1 connects two partitioned chambers through a plurality of passages, and controls the flow of oil produced in the passages by sliding a piston in a cylinder. A hydraulic shock absorber is provided with a damping force generation mechanism that generates a damping force through a damping force, and the damping force can be adjusted by opening and closing one of the plurality of passages, wherein the damping force is large when the two passages are closed. A damping force adjustment valve which has a heart characteristic and has a soft characteristic with a small damping force when opened is moved in the axial direction with the ability to move in the axial direction, and one end surface of the valve is seated on and off the valve seat formed in the - two passages. - a valve body for opening and closing two passages; a spring means for biasing the valve body in the valve closing direction to seat the valve body on the valve seat; A solenoid that is inserted and moves the plunger by power supply to open the valve body, a base made of a magnetic material that contacts the plunger in the valve opening position of the valve body, and a base made of a magnetic material that contacts the plunger with the base. a determining means for determining, and supplying a large current to the solenoid to open the valve body based on a damping force switching signal to the soft characteristic, and after determining whether the predetermined condition is satisfied or the f stage; A control device that changes and supplies weak current.

It's from arri.

(Function) With the above configuration, when power is not being supplied to the solenoid, the valve body is urged by the spring means and is seated on the valve seat, so a heart characteristic damping force is obtained, and a damping force switching signal to soft characteristic is obtained. By supplying a large current to the solenoid based on this, the plunger moves against the biasing force of the spring means to open the valve body and obtain a soft damping force. After the determining means determines that a predetermined condition indicating that the plunger has contacted the base is satisfied,
When the plunger is in contact with the base, the plunger is attracted to the base with a large force, so it is possible to maintain its position even with a small current. Further, when the power supply is stopped due to a disconnection or the like, the valve element is biased in the valve closing direction by the spring means, and a hard characteristic damping force is obtained.

(Example) Next, an example of the present invention will be described based on FIGS. 1 to 3.

First, the overall configuration of this embodiment will be explained using FIG. The interior of the inner cylinder 2 is divided by a piston 3 into a cylinder 1 chamber 4 shown on the -1 side in the figure and a cylinder lower chamber 5 shown on the C side. The rod 6 consists of a main body member 6a whose end projects outward and a small diameter member 6b provided on the other end side of the main body member 6a, and the piston 3 is fixed to the outer periphery of this small diameter member 6b. Small diameter member 6b
A cylindrical body 7 is attached to the tip. Further, the piston rotor is made of a magnetic material 1, and has a passage 8 for communicating the inside of the cylinder 7 and the two chambers 4 of the cylinder. The passage 8 is formed so that one end opens into the cylinder F chamber 4 and the other end extends in the axial direction and opens into the cylinder body 7. The interior of the cylinder 7 and the passage 8 of the piston rod 6 form a bypass passage 9 that communicates the cylinder lower chamber 4 and the cylinder lower chamber 5. This bypass passage 9 is opened and closed by a damping force adjustment valve l port which will be described in detail later.

The piston 3 is formed with a first extension passage 11 and a first contraction passage 12 that communicate the cylinder lower chamber 4 and the cylinder lower chamber 5. First extension side passage] On the cylinder lower chamber 5 side of l, there is a disc valve and orifice passage (not shown) for controlling the flow of oil that occurs during the extension stroke of the hydraulic shock absorber and generating damping force. A damping force generating mechanism 13 is provided on the cylinder upper chamber 4 side of the first compression side passage 12, and generates a damping force by controlling the flow of oil that occurs during the contraction stroke. A damping force generating mechanism 14 consisting of a disc valve is provided.

A partition member 15 that blocks the bypass passage 9 is fitted into the inside of the cylinder 7, and the partition member 15 has a second extension passage 16 and a second extension passage 16 that communicate the passage 8 and the lower cylinder chamber 5. A contraction side passage 17 is also formed. The second extension passage 16 on the cylinder lower chamber 5 side is comprised of a disc valve and an orifice passage (not shown) for controlling the flow of oil produced during the extension stroke and generating damping force. A damping force generation mechanism 18 is provided on the passage 8 side of the second contraction side passage 17 to allow the flow of oil from the cylinder lower chamber 5 to the passage 8, and to restrict the flow of oil in the opposite direction. 9 check valves are provided. Note that the second part of the partition member 15
A damping force generation mechanism 18 provided in the extension side passage 16 of
The disc hartz is the first extension side passage of the piston 3]
Damping force generation 11 &'m] : l
The disc is set to open with a smaller pressure difference than the Harz disc.

A body part 20 that can generate a damping force during the contraction stroke is provided on the lower side of the inner cylinder 2, and this body part 20 blocks communication between the inner cylinder 2 and the inner and outer cylinders. The body member 21, the third extension side passage 22 and the third contraction side passage 23 formed in the body member 21, and the third contraction side passage 23 provided on the outer cylinder 24 side and generated during the contraction stroke. A damping force generation mechanism 2 consisting of a disc hartz and orifice passage (not shown) for controlling the flow of oil.
5 and is provided on the inner cylinder 2 side of the third elongated narrow passage 22 to allow the flow of oil from between the inner and outer cylinders to the inner cylinder 2, and to prevent the flow of oil from the inner cylinder 2 to between the inner and outer cylinders. It is composed of a reverse one-way valve 26 that regulates.

Finally, the damping force adjustment valve IO, which is the main part of the present invention, will be explained.

A valve seat 27 is provided in the middle of the passage 8 formed in the piston rod 6. Further, a support member 28 attached to the inside of the piston rod 6 has a substantially cylindrical shape 11 that is slidable in the axial direction of the piston port 6.
A body 29 is provided, and the valve body 29 or the valve seat 27
The bypass passage 9 is opened and closed by taking off and sitting down. Then, the valve body 2 is moved by a coil spring 31 as a spring means arranged in an empty IJ 730 defined by the valve body 29 and the support member 28.
9 is always biased in the valve closing direction on the valve seat 27 side.

A valve body 29 made of a non-magnetic material is slidably inserted into the valve body 29, and a socket 33 is screwed onto the lower end of the shaft 32, and as the shaft 32 rises, the valve body 29 It is designed so that it can be pulled up.

The shaft 32 extends through the support member 28 in the axial direction -L of the piston rod 6, and a plunger 34 made of a magnetic material is attached to a part of the shaft -1. The plunger 34 is inserted into one solenoid 35. A base 36 made of a magnetic material is arranged on the 1- side of the solenoid 1-35, and the plunger 34 is regulated to move between the support member 28 and the base 36. A Riet wire 37 drawn out from both ends of the solenoid 35 passes through the inside of the piston rod 6 and is connected to an electric circuit 38 on the outside.

The electric circuit 38 is provided in the control device 39, and as shown in FIG. The configuration is such that power is supplied to the solenoid 35 by switching between the two. This control supplies a large current to the solenoid 35 at the start of power supply, moves the plunger 34 against the biasing force of the coil spring 31, and moves the plunger 34 to the base 3.
6, the current is changed to a weak current and then the current is supplied.

Here, the means for determining whether or not a predetermined condition indicating that the plunger 4 has contacted the base 36 is satisfied is to supply power to the solenoid 35 and then to make the plunger 34 contact the base 36. A time is set in advance, and when j71 has elapsed, the plunger 34 moves to the base 3.
6 is determined to have come into contact with the object. Note that since the current flowing through the solenoid 35 changes while the plunger 34 is moving, it may be determined that the plunger 34 has contacted the base 36 when the change stops and becomes constant. Further, a sensor may be provided to directly detect that the plunger 34 has come into contact with the base 36. The current switching means 42 is provided with means for determining whether a predetermined condition indicating that the plunger 34 has come into contact with the base 36 is satisfied.

The operation of the damping force adjustable hydraulic shock absorber 1 having the following configuration will be explained.

First, when the solenoid 35 is not supplied with power, it is energized by the valve body 29 or the coil spring 31 and is in a closed state as shown in the left half of FIG. 1, so the bypass passage 9 is blocked. . Therefore, during the extension stroke, the piston 3
Damping force generation f provided in the first elongated narrow passage 11 of
11. A large damping force is generated by the mechanism 13, and during the contraction stroke, the damping force generated by the damping force generating mechanism 14 provided in the first contraction narrow passage 12 of the piston 3 and the third damping force of the body member 21 of the body portion 20 are generated. A large damping force is generated in addition to the damping force generated by the damping force generator 4R25 provided in the narrow contraction passage 23 (hard characteristic).

When opening the bypass passage 9, since the valve body 29 or the coil spring 31 is biased, a force sufficient to move against this biasing force is required, and a large current is applied to the electric circuit 38.
is supplied to the solenoid 35 from. Then, as shown in the left half of FIG. 1, the plunger 34 is pulled up, the valve body 29 is separated from the valve seat 27, and the bypass passage 9 is opened. When the plunger 34 is pulled up and the determining means determines that a predetermined condition indicating that it has contacted the base 36 is satisfied, the plunger 34 is attracted to the base 36 and is maintained to that extent even with a small current. The current supplied from the electric circuit 8 is changed to a weak current. Therefore, the current consumption can be significantly reduced compared to the conventional system in which the valve is maintained in an open state by flowing the same amount of current as when the valve is opened.

Moreover, when the bypass passage 9 is open in this way, the partition member 15 in the cylinder body 7 is closed during the extension stroke of the hydraulic shock absorber.
A small damping force is generated by the damping force generator 4Jh18 provided in the second extension side passage 16 of the body member 21 of the body part 20 during the contraction stroke. A small damping force is generated by the damping force generation mechanism 25 (soft characteristic).

By supplying current to the solenoid 35 as described above, the bypass passage 9 can be opened and closed to adjust the damping force. Then, for example, the solenoid 3 is
Regarding the supply of current to 5! 1- When the coil spring 31
Since the valve body 29 is pushed back in the direction of the closing valve R and blocks the bypass passage 9, a heart characteristic damping force is obtained and steering stability is ensured.

Here, using the flowchart 171 shown in FIG.
We will explain the control of damping force adjustment.

At step (0), it is determined whether or not a damping force switching signal to the soft characteristic is output. Based on the information, the damping force switching signal of the C control device 39 is generated.
3 or output by switching as appropriate. Step (1)
If the result is Yes, the process proceeds to step (2). Also, if step ■ is judged as No, step (mark solenoid 3).
The power supply to F is stopped and the heart damping force characteristic is maintained, or the soft characteristic is switched to the heart characteristic.
Proceed to ND. In step 2, it is determined whether the valve body 29 is open (damping force or soft characteristic). This determination can be made by monitoring in the control device 39 whether a weak current or power is being supplied to the solenoid 35, or by setting a flag after making a weak current flow in step (El') described later. It is done by memorizing.

If it is determined Yes in step (2), the process directly proceeds to E)10 since it is currently in a software state. Yes at step ■
s, the valve body 29 is in the closed position even though the damping force switching signal to the soft characteristic has been output, so a large current is supplied to the solenoid 35 in step (2) to switch the valve body 2
9 is opened f to obtain a soft characteristic damping force, and the process proceeds from step (2) to step (2). In step (2), it is determined whether the valve body 29 is opened. This determination is made by the Hokkaido determination means. If the determination is NO in step ■, the valve body 2 is still
9, it is determined that the opening is not completed and the process proceeds to END.

If it is determined Yes in step ■, it is determined that the JR body 29 has been completed, and the process proceeds to step (6), where the current supplied to the plunger 34 is changed to a weak current, and END.
Proceed to. In this way, the damping force of the bar 1 characteristic and the damping force of the soft characteristic are controlled.

In addition, in the embodiment described in (1)--, the damping force adjustment valve 10 of the present invention was used to open and close the bypass passage 9 provided in the piston 3, or a damping force adjustment valve 10 of the present invention was used to selectively open and close the passage in the body of the hydraulic shock absorber. things (for example, J-Rekijitsu Kosho 59-22:1
The damping force adjusting valve 10 of the present invention may be applied to the damping force adjusting valve 10 of the present invention.

(Effects of the Invention) As explained in detail above, when opening the bypass passage in order to change from heart characteristic damping force to soft characteristic damping force, the current supplied to the solenoid is initially set to a large value. For those that supply a normally open current by moving the valve body against the force of the spring means and reducing the supplied current after the valve body moves and the plunger is attracted to the base. It is possible to reduce the current consumption.

Furthermore, when the supply of current is stopped due to a disconnection, etc., the spring means seats on the valve body or valve seat and the bypass passage is cut off, resulting in a heart characteristic damping force and ensuring steering stability. I can do it.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the damping force adjustable hydraulic shock absorber of the present invention.FIG. 52 is a diagram showing the configuration of an electric circuit for controlling the hydraulic shock absorber shown in FIG. FIG. 3 is a flowchart of damping force adjustment control. 2...Inner vI (cylinder) 3...Piston 9...
・Bypass passage 10...damping force adjustment valve 13, +
4.18.25... Damping force generation mechanism 27... Valve seat
29... Valve body 31... Coil spring (spring means)

Claims (1)

[Claims] (1) Connecting two divided rooms through multiple passages,
A damping force generation mechanism is provided that generates damping force by controlling the flow of oil generated in the passage by the sliding of the piston in the cylinder, and the damping force can be adjusted by opening or closing one of the plurality of passages. In this hydraulic shock absorber, a damping force adjustment valve is movable in the axial direction and has a damping force adjustment valve that has a hard characteristic with a large damping force when the one passage is closed and a soft characteristic with a small damping force when it is opened. a valve body whose one end surface sits on and off a valve seat formed in the one passageway to open and close the one passageway; a spring means that seats the valve body on the valve seat and urges the valve body in a valve-closing direction; a plunger made of a magnetic material attached to a valve body; a solenoid into which the plunger is inserted and which moves the plunger by supplying electricity to open the valve body; a base made of a magnetic material in contact with the base; a determining means for determining whether or not a predetermined condition indicating that the plunger has contacted the base; and a large current flowing to the solenoid based on a damping force switching signal to the soft characteristic. a control device that supplies a weak current to open the valve body, and after the determining means determines that the predetermined condition is satisfied, changes the current to a weak current and supplies the damping force adjustment. Hydraulic shock absorber.