JPS58106239A - Oil pressure damper - Google Patents

Abstract

PURPOSE:To reduce electrical energy loss by constituting the member to form a magnetic field with a permanent magnet, by applying current to a solenoid according to necessity for change of the damping characteristic, and thereby controlling the magnetic force. CONSTITUTION:At the end of a solenoid 12, together with a bobbin 10 is installed a stretch side damping valve 15 consisting of a magnetic material in the form of a hollow disc with a partition plate 14 of nonmagnetic material interposed, being energized by a spring 16. At the lower part of a piston 2, a ring- shaped permanent magnet 13 is fixed. In order to change the magnetic force of this permanent magnet 13, a counter-current required to demagnetize at the time of magnetic force control is applied to put in demagnetization state, and then current is applied so that the residual magnetic force will become the specified value anew, to magnetize the permanent magnet 13, and then the current is shut off. Thus control of current application is made only when the damping force is changed to change the magnetic force, whereby power consumption can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hydraulic shock absorber for a motorcycle or a four-wheeled vehicle.

The damping characteristics required of a hydraulic shock absorber change in various ways depending on the operating conditions, but generally only preset fixed characteristics can be imparted, and it is not possible to strictly meet the requirements. was the current situation.

On the other hand, for example, the applicant filed a patent application in 1986-55.
No. 213 proposes a system in which the damping force of the damping pulp can be continuously varied using an electromagnetic solenoid depending on operating conditions.

According to this, a pulp gear is fixed in a flow path through which hydraulic oil flows as the piston moves, and an electromagnetic solenoid is housed inside the four-pulp gear. A plate-shaped damping pulp that opens and closes the seat part of the loop hole is formed of a magnetic material, and pressure is applied so that the valve opening pressure of the damping pulp is continuously increased or decreased in accordance with the attraction force of an electromagnetic solenoid. There is.

This increases the damping force during turns, meandering, sudden stops, and sudden starts to prevent vehicle body rolling and pitching, while also providing soft damping characteristics during normal driving to improve ride comfort. For this reason, the solenoid coil is always energized, and by selecting the current value, the attraction force to the damping pulp is changed. Therefore, there is a problem that a large amount of power is consumed and the heat generated by the solenoid coil promotes a rise in the temperature of the hydraulic oil.

The present invention is intended to solve the above-mentioned problems, and consists of a permanent magnet as part or all of the member that forms the magnetic field, and the magnetic force is changed by energizing an electromagnetic solenoid as needed to change the damping characteristics. It is an object of the present invention to provide a hydraulic shock absorber which is controlled to reduce pneumatic energy loss and prevent a rise in temperature of hydraulic oil.

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, a piston 2 is slidably housed in a cylinder 1 and defines an oil chamber C1Cgl.

A piston rod 4 is movably supported by a bearing part 3 fitted in the upper part of the cylinder 1, and a stop rubber 5 which receives the full extension load of the piston 2 is attached to the bearing part 3 via a retainer 6.

A stone/f8 is engaged with the distal end mounting portion 7 of the piston rod 4 facing the stop rubber 5, and the piston 2 is fixed with a piston nut 9 when inserted into the stepped portion 7.

The piston 2 made of magnetic material has a cylindrical shape with an inside
The solenoid coil 11 wound around the pobbin 10 is inserted into the stepped part 7 and is housed in the hollow part 2B to form a pulp zaddy.
On the other hand, an annular permanent magnet 13 is fixed to the lower part of the piston 2.

At the end of the electromagnetic solenoid 12, together with the pobbin 10, a hollow disk-shaped expansion damping pulp 15 made of a magnetic material is attached via a partition plate 14 made of a non-magnetic material, and the pulp 15 and the piston nut 9 The pulp hole 17, which passes through the piston 2 and communicates with the oil chambers C1 and C below, is closed by a nine-disc spring 16 interposed between the piston 2 and the piston 2.

Note that the sheet portion 18 formed at the opening of the pulp hole 17
is formed on the partition plate 14, and this sea)fd5
The expansion side damping pulp 15 that closes 1g is the electromagnetic solenoid 1
The end face of the permanent magnet 13, which is magnetized to the second position, is attracted to the end face of the permanent magnet 13, and the pressure force against the valve seat portion 18- is increased.

A compression side pulp hole 19 is formed on the outside of the expansion side pulp hole 17 through the piston 2, and a compression side check valve 20 that closes this pulp hole 17 at the upper end of the piston 2 is interposed between it and the stock horn 8. ing.

By the way, the solenoid coil 11 has its lead I.
Wiring passage 2 provided by fM21 at the center of piston rod 4
2, and by inputting a control signal (current) to this lead wire 21, the attraction force of the permanent magnet 13 magnetized by the solenoid solenoid 12, in other words, the expansion side damping. The set load (valve opening pressure) of the pulp 15 can be adjusted continuously.

The present invention is constructed as described above, and its operation including its control operation will be explained next.

During the extension side operation where the piston rod 4 extends (however, the first
(The figure shows the most extended state), hydraulic oil flows from the upper oil chamber C1, which contracts as the piston 2 rises, into the lower oil chamber C3, which expands, through the expansion-side damping pulp 15. At this time, the expansion side damping pulse! The valve opening pressure 15 is a combination of the biasing force of the sedge ring 16 and the adsorption force of the permanent magnet 13. Therefore, for the hydraulic oil flowing by pushing the expansion-side damping pulp 15 apart, Resistance based on this combined load is added, and this becomes what is called a rebound damping force.

By the way, in a magnetic material such as magnetic soft iron, the residual magnetic force E after the electromagnetic solenoid 12 is de-energized and the magnetic field H is made zero is extremely small, being EO as shown in FIG. However, in order to maintain the required composite load as described above, it is necessary to constantly energize the electromagnetic solenoid 12 to ensure the necessary magnetic force.

On the other hand, in the case of the permanent magnet 13 of the present invention, as shown in FIG. 3, the residual magnet ratio when the magnetic field E is zero is extremely large. Therefore, in the present invention, in order to change the magnetic force of the permanent magnet 13, after the permanent magnet 13 is brought into a demagnetized or nearly demagnetized state by applying a reverse current or an alternating current necessary for demagnetizing d1 during magnetic force control, Power is applied again so that the residual magnetic force Eo becomes the required value, and the permanent magnet';f:J
Magnetize 13 and cut off one illumination. In this way, the opening pressure of the expansion-side damping valve 15 can be increased or decreased without folding by controlling the energization and changing the magnetic force only when the damping force is being changed. Note that it goes without saying that the magnetic force can be changed by directly demagnetizing or magnetizing the magnetic force without demagnetizing all the 4id degrees of magnetic force.

As a result, the power consumption is dramatically reduced by 1°C1 Jt compared to the conventional device which maintains a predetermined magnetic force by constantly controlling the energization.

For the upper 6-pin electric df lens 12, for example, a control circuit that calculates and processes ρ detection signals from a vehicle speed detection sensor, a load detection sensor, a shock absorber position detection sensor, a braking detection sensor, a starting acceleration detection sensor, etc. The permanent magnet attraction force may be controlled by supplying a control current through the permanent magnet so as to obtain the optimum damping force depending on the operating condition.

4 to 8 each show another embodiment of the present invention.

In FIG. 4, the entire piston 2 is made of a permanent magnet.

In FIG. 5, the piston 2 and piston rod 4 are entirely made of permanent magnets, and the valve opening pressures of both damping pulps 15 and 20 are controlled.

In FIG. 6, an electromagnetic solenoid 12 is arranged at the lower end of the piston rod 4, a cag-shaped cover 23 is formed of a permanent magnet, and the expansion-side damping pulp 15 is attracted from below to control its valve opening pressure. This is what I did.

In FIG. 7, the rebound damping pulp 15 is formed into a piston-shaped permanent magnet that is inserted into the inner hole of the electromagnetic solenoid 12, and the diaphragm 2
The valve opening pressure is controlled by adsorption to the seat portion 25 of No. 4.

FIG. 8 shows an electromagnetic solenoid 12 disposed in the communication portion between the outer cylinder 26 and the inner cylinder 27, and its case 28 made of a permanent magnetic material to control the valve opening pressure of both damping pulps 15 and 20. As explained above, according to the present invention, part or all of the member that forms the magnetic field of the electromagnetic solenoid is formed of a permanent magnet, and the valve opening pressure of the damping pulp is controlled by the electromagnetic solenoid. Since it is made to increase and decrease continuously using the residual attraction force of the magnetized permanent magnet, it is only necessary to energize the electromagnetic solenoid when giving the required value to the residual magnetic force of the permanent magnet, thus reducing power consumption. k. It has the effect of preventing the temperature of the hydraulic oil from rising due to heat generation in the coil.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of the present invention, FIGS. 2 and 3 are relationship diagrams of the magnetic field and residual magnetic force when the members forming the magnetic field are magnetic soft iron and permanent magnet, respectively. 8
2A and 2B are cross-sectional views showing other embodiments of the present invention, respectively. DESCRIPTION OF SYMBOLS 1...Cylinder, 2...Piston, 4...-Piston rod)'', 10...R bottle, 11...Solenoid coil, 12...Electromagnetic solenoid, 13...Permanent magnet, 15 ... Growth side damping valve, 17... Growth side valve hole, 18... Seat part, 23... Cover, 24...
...Partition plate, 28...Case O Patent applicant Kayaba Kogyo Co., Ltd. Figure 1 Figure 2 Figure 3 Figure 4 Procedural amendment (method) 1. Display of the case 1982 Patent Application No. 132524 2 Name of the invention Hydraulic shock absorber 3 Relationship to the case by the person making the amendment Patent applicant residence 19r World Trade Center Building, No. 1, Hamamatsucho 2-chome, Minato-ku, Tsukabetsu Name ((192) Kayaba Kogyo Co., Ltd. 4, Agent address: Showa 5, 8-10-8 Ginza, Chuo-ku, Tokyo 104
January 5, 1988 (Date of dispatch: January 25, 1980) 6, Subject of amendment 7, Statement of contents of amendment #I, page 9, line 19, ``Nos. 4 to 8'' was changed to ``No. Figures 4 to 8 are corrected.

Claims (1)

[Claims] l In a hydraulic loosener in which a piston is slidably housed in a cylinder and oil chambers are formed on both sides of the piston, a pulp body is provided in a flow path through which hydraulic oil flows as the piston moves. A paper solenoid is fixed inside the pulp body, and a plate-shaped attenuating pulp is made of a magnetic material that penetrates the sheet portion of the pulp hole provided in the pulp body, while a magnetic field is generated. A part or all of the member is made of a permanent magnet, and the valve opening pressure of the damping pulp is continuously increased or decreased in accordance with the residual attraction force of the permanent magnet magnetized by an electromagnetic solenoid. Hydraulic shock absorber. 2. Try to attach the pulp body to the piston rod.
2. A hydraulic shock absorber according to claim 1, characterized in that the piston is constructed of a permanent magnet.