CN105822713A - Vehicular damping force generation device - Google Patents

Abstract

The invention provides a vehicular damping force generation device. The vehicular damping force generation device (10) includes a shock absorber (16) with a cylinder (12) and a piston (14). The shock absorber is connected to a vehicle body (22) and a wheel rack (28) at a rod part (14R) of the piston and the cylinder, and the damping force is generated through a circulation resistance when the oil (76) passes through an orifice arranged at the piston. Self discharge type electricity removers (90A-90E) are fixed on a surface of a specific member that is at least one assembly member of the shock absorber (16) and an accessory member connected to the assembly member. The electricity removers decrease the electric quantity of the oil by reducing positive charges on the specific member.

Description

The damping force generator of vehicle

Technical field

The present invention relates to the damping force generator of vehicle, especially relate to the damping force generator comprising amortisseur.

Background technology

When the vehicles such as motor vehicles travel, because air flows when contacting with vehicle friction, electrostatic can be produced at vehicle.And, electrostatic also can because of with the rotation of wheel each several part of tire be repeated relative to road surface repeatedly contact and peel off, in electromotor and brake unit etc., component parts produces so that the state of contact carries out relative motion etc..

Vehicle is in substantially from the state of the earth electric insulation because of the low tire of electric conductivity, if therefore vehicle produces electrostatic, then electric charge (usually positive charge) can by vehicle body etc. with.When vehicle body etc. is with electric charge, easily produce radio noise, have studied the most in the past use the power on reduce vehicle with the structure of electric charge, it is proposed that various structures.

Such as, following electrostatic removal device recorded by following patent documentation 1, the most intensive to ceramic body and fill charged silicon in the housing that configures, the side of wire being connected to the both sides of housing is connected with the negative terminal of accumulator, and the opposing party of wire is connected with vehicle body.According to this electrostatic removal device, the electrostatic of vehicle body is neutralized by ground connection, it is possible to reduce vehicle body with electric charge.

[prior art literature]

[patent documentation]

[patent documentation 1] Japanese Unexamined Patent Publication 2009-181694 publication

Summary of the invention

The problem that invention is to be solved

Existing electrostatic removal device described in above-mentioned patent documentation 1 has the structure of complexity, and electrostatic removal device the terminal born and vehicle body with accumulator must be connected by wire, and is also required to the installation space of electrostatic removal device.

It addition, be equipped with the damping force generator of the vibration decay making vehicle body at vehicle.Damping force generator comprises the amortisseur of the piston having cylinder and can reciprocatingly be embedded in this cylinder.Amortisseur is linked to spring upper member and the spring lower member of vehicle respectively by bar portion and the cylinder of piston, utilizes with spring upper member and the relative displacement of spring lower member oil to produce damping force by the circulating resistance during throttle orifice of being located at piston.

The experimental research carried out by the present application person, understood vehicle with electric charge harmful effect that vehicle is caused be not limited to easily produce radio noise.I.e., it is known that when vehicle is with electric charge, the oil in amortisseur is also with electric charge, and the viscosity of oil raises and damping force easily becomes superfluous.

Additionally, the existing electrostatic removal device described in above-mentioned patent documentation 1 is owing to being restricted by setting place, therefore existing electrostatic removal device can not be arranged on the oil that can efficiently reduce in amortisseur with the position of electric charge.Therefore, by existing electrostatic removal device, it is impossible to be effectively prevented because of the charged of electric charge the viscosity of oil and raise thus damping force becomes superfluous.

Currently invention addresses the above-mentioned phenomenon and reason thereof in the past do not recognized and make.Further, the major subjects of the present invention is, it is possible to prevents the oil in amortisseur superfluously with electric charge, is therefore prevented from the viscosity of oil because of the charged of electric charge and raises thus damping force becomes superfluous.

For solving scheme and the invention effect of problem

According to the present invention, the damping force generator of a kind of vehicle is provided, including amortisseur, described amortisseur has cylinder and piston, described piston forms two cylinder chamber can be embedded in described cylinder in the way of moving back and forth and cooperate with described cylinder, described amortisseur is linked with the spring upper member of vehicle and a side of spring lower member by the bar portion of described piston, linked by the opposing party of described cylinder with described spring upper member and described spring lower member, described amortisseur is configured to by the circulating resistance when the throttle orifice of the main part that process is located at described piston moves between said two cylinder chamber hydraulic fluid with described spring upper member and the relative displacement of described spring lower member, and produce damping force.

Surface configuration in particular elements has self discharge formula except electrical equipment, and described particular elements is the component constituting described amortisseur and at least one party in the Accessory Members being connected with described amortisseur.Described self discharge formula is that air ion conversion type self discharge formula is except electrical equipment except electrical equipment, be configured to according to described particular elements with the carried charge of positive electric charge, described self discharge formula is made to be changed to, except the air of surrounding of electrical equipment, the air ion born, electricity is removed by being neutralized to the positive charge attraction of described particular elements by described air ion, the carried charge making described particular elements declines, so that the carried charge of described hydraulic fluid declines.

Although the such hydraulic fluid of the oil of amortisseur may not be clear and definite with the reason of electric charge and the viscosity of hydraulic fluid raises when hydraulic fluid is with electric charge reason when vehicle body etc. is with electric charge, but it is believed that main reason and reason are as follows.Amortisseur is linked with the spring upper member of vehicle and a side of spring lower member and the opposing party respectively by bar portion and the cylinder of piston, and therefore when vehicle body etc. is with electric charge, electric charge can move to piston and cylinder via spring upper member and spring lower member.When piston and cylinder with the quantitative change of electric charge many time, the part for these electric charges hydraulic fluid in amortisseur moves, as a result of which it is, working solution is known from experience with electric charge.When hydraulic fluid is with electric charge, the degree of freedom of the molecule of hydraulic fluid declines, and this situation can be estimated as the viscosity of hydraulic fluid and raise.

According to above-mentioned structure, the surface configuration of the most specific component of at least one party in the component constituting amortisseur and the Accessory Members being connected with amortisseur has self discharge formula except electrical equipment.Air about should be made to be changed to the air ion born except electrical equipment, and air ion was neutralized to the positive charge attraction of specific component and except electricity, makes the carried charge of specific component decline.Thus, the hydraulic fluid in amortisseur with electric charge move to specific component, thus the carried charge of hydraulic fluid declines, therefore, it is possible to prevent the viscosity of hydraulic fluid from raising because of the charged of superfluous electric charge thus damping force becomes surplus.

Additionally, according to above-mentioned structure, it is convenient to omit the electrostatic removal device of complicated structure, thus electrostatic removal device can be connected with the terminal born and the vehicle body of accumulator by wire.It addition, self discharge formula except electrical equipment can be available specific component with electric charge carry out the thinnest electric conductor of so-called self discharge, therefore need not arrange space big as the situation of electrostatic removal device.

(form of invention)

In a form of the present invention, described particular elements is the resinous dust cover as Accessory Members being connected with described bar portion, described self discharge formula is arranged at the surface of described dust cover except electrical equipment, and described bar portion and described dust cover can connect by electric charge in the way of described bar portion moves to described dust cover.

According to above-mentioned form, self discharge formula is arranged on the surface of dust cover except electrical equipment, and dust cover is by the resin formation with electric charge easy compared with metal.And, bar portion and dust cover can connect by electric charge in the way of bar portion moves to dust cover.Thus, dust cover carried out except electricity by self discharge formula except electrical equipment, piston with electric charge move to dust cover via bar portion, therefore hydraulic fluid with electric charge move to piston.Therefore, it is possible to reduce the carried charge of hydraulic fluid, therefore, it is possible to prevent the viscosity of hydraulic fluid from raising because of the charged of superfluous electric charge thus damping force becomes surplus.

In a form of the present invention, described amortisseur is to have the inner cylinder chimeric for described piston and the Dual-drum amortisseur of the outside cylinder around this inner cylinder, described particular elements is described outside cylinder, and described self discharge formula is located at the surface of described outside cylinder except electrical equipment liquid level place on the lower of described hydraulic fluid between described inner cylinder and described outside cylinder when being in the loading condition of standard than described vehicle.

According to above-mentioned form, self discharge formula is except electrical equipment is in the amortisseur of Dual-drum, and the liquid level place on the lower of the hydraulic fluid between inner cylinder and outside cylinder when being in the loading condition of standard than vehicle is located at the surface of outside cylinder.Thus, with self discharge formula except electrical equipment the place by the top of the liquid level than the hydraulic fluid between inner cylinder with outside cylinder be located at outside cylinder surface situation compared with, it is possible to effectively the hydraulic fluid between inner cylinder and outside cylinder is carried out except electricity.Therefore, it is possible to effectively inner cylinder is carried out except electricity, it is possible to make hydraulic fluid in inner cylinder with electric charge effectively move to inner cylinder, therefore, it is possible to effectively the hydraulic fluid in inner cylinder is carried out except electricity.

In a form of the present invention, described amortisseur is Dual-drum amortisseur, has: inner cylinder, is fitted together to for described piston；Outside cylinder, around described inner cylinder and between described outside cylinder and described inner cylinder formed storeroom；Bottom valve assembly；And end cap, by described inner cylinder and the end-enclosed of described outside cylinder and cooperate with described bottom valve assembly and delimit the bottom valve room that connects with described storeroom, described particular elements is at least one party in described outside cylinder and described end cap, and electric charge can move to described particular elements from described inner cylinder.

According to above-mentioned form, self discharge formula is except electrical equipment is in Dual-drum amortisseur, and the surface of at least one party being located in the outside cylinder as specific component and end cap, electric charge can move to specific component from inner cylinder.When by carrying out specific component except electricity except electrical equipment, electric charge moves to specific component from inner cylinder, and the current potential of inner cylinder declines, therefore the hydraulic fluid in inner cylinder with electric charge move to inner cylinder.Therefore, it is possible to the carried charge of the hydraulic fluid in minimizing inner cylinder, therefore, it is possible to prevent the viscosity of hydraulic fluid from raising because of the charged of superfluous electric charge thus damping force becomes surplus.

In a form of the present invention, described amortisseur is single cylinder type amortisseur, described particular elements is described cylinder, the scope in the direction of the described relative displacement residing for the main part of described piston when being in the loading condition of standard at described vehicle is set to the scope of regulation, and described self discharge formula is arranged at the surface of described cylinder except a part for electrical equipment except electrical equipment in the way of the most described self discharge formula is positioned in the range of described regulation.

According to above-mentioned form, self discharge formula, except electrical equipment is in single cylinder type amortisseur, is located at the surface of cylinder, therefore by carrying out, except electricity, making the current potential of cylinder decline to cylinder except electrical equipment, thus hydraulic fluid with electric charge move to cylinder.Therefore, it is possible to reduce the carried charge of hydraulic fluid, therefore, it is possible to prevent the viscosity of hydraulic fluid from raising because of the charged of superfluous electric charge thus damping force becomes surplus.And then, with self discharge formula compared with the situation on the surface that electrical equipment is located at cylinder in addition to the scope of regulation, it is possible to effectively carry out being provided with the hydraulic fluid that the surrounding of the main part of the piston of throttle orifice exists except electricity.

In a form of the present invention, described amortisseur is damping force type variable amortisseur, there is bypass, variable orifice and virtual channel sectional area variset, described bypass is walked around the main part of described piston and said two cylinder chamber is connected, described variable orifice is located at described bypass, described virtual channel sectional area variset makes the virtual channel sectional area of described variable orifice change, described damping force type variable amortisseur is configured to when described piston carries out displacement relative to described cylinder, the at least some of of described hydraulic fluid in the described cylinder chamber of one side moves to the described cylinder chamber of the opposing party via described bypass, described particular elements is virtual channel sectional area variset, electric charge can move to described virtual channel sectional area variset from the described hydraulic fluid through described bypass.

According to above-mentioned form, self discharge formula, except electrical equipment is in damping force type variable amortisseur, is arranged on the surface of virtual channel sectional area variset, and this virtual channel sectional area variset makes to be located at the virtual channel sectional area change of the variable orifice of bypass.And, electric charge can move to virtual channel sectional area variset from the hydraulic fluid through bypass.Thus, virtual channel sectional area variset carried out except electricity by self discharge formula except electrical equipment, hydraulic fluid with electric charge move to virtual channel sectional area variset, therefore through bypass hydraulic fluid with electric charge reduce.Therefore, it is possible to prevent the viscosity of hydraulic fluid through variable orifice from raising because of the charged of superfluous electric charge thus damping force becomes surplus.

In a form of the present invention, described self discharge formula has except electrical equipment: the metal forming of electric conductivity, has multiple small concavo-convex in the side of periphery；And adhering agent layer, on the face of the side being attached to this metal forming, described self discharge formula is fixed on described particular elements except electrical equipment by the bonding of described adhering agent layer.

According to above-mentioned form, it is possible to easily will carry out being fixed on the surface of specific component except the metal forming of electricity by bonding.And, metal forming is close to specific component at whole via adhering agent layer, therefore, it is possible to effectively carry out electric charge from specific component to the movement of metal forming, it is possible to increase except the effect of electricity.

Accompanying drawing explanation

Fig. 1 is the skeleton diagram of the damping force generator of the first embodiment illustrating the present invention being applied to McPherson pillar front suspension with the state observed from the rear of vehicle.

Fig. 2 is the axonometric chart illustrating the damping force generator shown in Fig. 1.

Fig. 3 is the exploded perspective view illustrating the damping force generator shown in Fig. 1.

Fig. 4 is the amplification view of the outline illustrating the Dual-drum amortisseur shown in Fig. 1.

Fig. 5 is that the self discharge formula before illustrating bonding is except the amplification view of electrical equipment.

Fig. 6 be illustrate oil in dust cover, piston, cylinder and amortisseur by the figure of the relation of the charged current potential caused of positive electric charge.

Fig. 7 is the schematic explanatory diagram of the mechanism except electricity illustrating that self discharge formula removes electrical equipment, and (A) and (B) is sectional view and top view respectively.

Fig. 8 is the partial sectional view of the major part of the damping force generator illustrating the second embodiment of the present invention being applied to McPherson pillar front suspension with the state observed from the rear of vehicle.

Fig. 9 is the sectional view of the outline illustrating the single cylinder type amortisseur shown in Fig. 8.

Figure 10 is that the outline of the amortisseur of the damping force generator of the third embodiment of the present invention constituted by the amortisseur as Dual-drum damping force type variable is with the amplification view shown in extended travel.

Figure 11 is that the outline of the amortisseur of the damping force generator by the 3rd embodiment is with the amplification view shown in retraction stroke.

Figure 12 is to be shown as the amortisseur of single cylinder type damping force type variable and the amplification view of the outline of the amortisseur of the damping force generator of the 4th embodiment of the present invention that constitutes.

Figure 13 is the exploded perspective view of the damping force generator illustrating fixed case.

Detailed description of the invention

Hereinafter, referring to the drawings, the preferred embodiment of the present invention is described in detail.

[the first embodiment]

Fig. 1 is the skeleton diagram of the damping force generator 10 of the first embodiment illustrating the present invention being applied to McPherson pillar front suspension with the state observed from the rear of vehicle, Fig. 2 and Fig. 3 is axonometric chart and the exploded perspective view illustrating the damping force generator 10 shown in Fig. 1 respectively.

In these figures, damping force generator 10 has the amortisseur 16 comprising cylinder 12 and piston 14.Piston 14 is can be embedded in cylinder 12 in the way of moving back and forth along axis 12A relative to cylinder 12.Cylinder 12 and piston 14 are formed by metals such as steel.The upper end of the bar portion through cylinder of 14R 12 of piston 14 and extend upward.Additionally, the component illustrated afterwards is in addition to the component of specifically mentioned constituent material, all by steel etc., there is the metal of electric conductivity and formed.The metal component comprising cylinder 12 and piston 14 is coated to improve durability, and surface is covered by dielectric film.

In the upper end of bar portion 14R, by upper supporting piece 18, the vehicle body 22 as spring upper member with vehicle 20 links amortisseur 16, and links with the vehicle wheel frame 26 as spring lower member of vehicle 20 via the bracket 24 of bottom being fixed on cylinder 12.It is known that upper supporting piece 18 is by being arranged in the rubber bushing device of the inside of housing 18A and support rod portion 14R.The main shaft 30 of wheel 28 is supported as rotating around rotation axis 32 by vehicle wheel frame 26 via the bearing not shown in figure.Additionally, the bottom of amortisseur 16 can be by connection unit as the rubber bushing device not shown in figure can be linked to vehicle wheel frame 26 or suspension member by the way of relative motion.

In the illustrated embodiment, wheel 28 is deflecting roller and is driving wheel, and connecting via universal joint 34 at main shaft 30 has drive shaft 36.Wheel 28 includes the wheel component 38 being arranged on the flange part of main shaft 30 and is assemblied in the tire 40 being made up of rubber etc. of the periphery taking turns component 38.Additionally, the wheel of the damping force generator of the application present invention can also be non-steering wheels, it is also possible to be driven pulley, and then can also be trailing wheel.

The outer end of control arm (underarm) 42 via ball-and-socket joint 44 so that pivotally supported mode the bottom of vehicle wheel frame 26 can be linked to.In the illustrated embodiment, control arm 42 also has the L-arm of the inner and rear end outside being in addition to outer end, and inner and rear end is supported as swinging by the bracket (not shown) of vehicle body via rubber bushing device 46,48 respectively.The center in bulb of ball-and-socket joint 44 and the center coordination with one another of upper supporting piece 18 that arrange in the outer end of control arm 42 and determine the profile that turns to bearing pin 50.Therefore, wheel 28 by the transfer not shown in figure via track rod around turning to bearing pin 50 to drive, thus turn to.

Although it is not shown in the figure, the through upper spring seat in upper end 52 of the bar portion 14R of piston 14 and extend.As hereinafter illustrated with reference to Fig. 3, upper spring seat 52 is fixed on bar portion 14R in order to the mode abutted with the lower surface of upper surface with upper supporting piece 18.Between upper spring seat 52 and the lower spring cup 54 being fixed on cylinder 12, elasticity is provided with the compression helical spring 56 as bearing spring.

From the above description, damping force generator 10 is applied to McPherson pillar front suspension, and amortisseur 16, upper supporting piece 18 and compression helical spring 56 etc. cooperate and constitute McPherson post.Thus, upspringing due to wheel 28, rebound and time vehicle wheel frame 26 moves up and down, control arm 42 swings in the vertical direction around rubber bushing device 46,48, and amortisseur 16 stretches, and compression helical spring 56 occurs elastic deformation.

As it is shown on figure 3, the spring base bolster 58 of the through lower section being positioned at upper spring seat 52, the upper end of bar portion 14R and the upper end of dust cover 60.Spring base bolster 58 and dust cover 60 are to be fixedly connected to the Accessory Members of the amortisseur 16 of bar portion 14R, by resin formation between the shoulder 14S of upper spring seat 52 and bar portion 14R by being crimped to.Spring base bolster 58 is abutted with the lower surface of upper spring seat 52 by the upper surface of peripheral part.

The most in the illustrated embodiment, dust cover 60 has: cylindrical portion 60C extended along them at cylinder 12 and bar portion 14R；The installation portion 60A being integrally forming with the upper end in the alms bowl shape spun upside down and with cylindrical portion 60C.Installation portion 60A by airtight for the upper end of dust cover 60, is close to bar portion 14R by the wall of hole 60H in addition to the hole 60H inserted for bar portion 14R.Cylindrical portion 60C is retractile accordion, when being subject to the compressive load along axis 12A, compression occurs.

As schematically shown in fig. 4, amortisseur 16 is double-drum type vibration damper, and cylinder 12 includes inner cylinder 12X and the outside cylinder 12Y extended the most with one heart along axis 12A.Inner cylinder 12X and outside cylinder 12Y are linked by end cap 62 and 64 integratedly in upper end and lower end respectively.The bar portion through end cap of 14R 62 of piston 14 and extend outside cylinder 12, end cap 64 is by airtight for the lower end of cylinder 12.In the cylinder 12X of side, it is configured with bottom valve assembly 66 close to end cap 64 ground, and is fixed on inner cylinder 12X.

The main part 14M of piston 14, can closely be embedded in inner cylinder 12X in the way of moving back and forth along axis 12A, cooperates with inner cylinder 12X and end cap 62 and forms room 68 on cylinder, cooperates with inner cylinder 12X and bottom valve assembly 66 and forms room 70 under cylinder.Forming bottom valve room 72 between bottom valve assembly 66 and end cap 64, the annular chamber 74 between bottom valve room 72 with inner cylinder 12X and outside cylinder 12Y connects.

On cylinder, under room 68, cylinder, room 70, bottom valve room 72 and annular chamber 74 are filled with the oil 76 as hydraulic fluid, and the upper portion in annular chamber 74 is sealed with gas 78 as nitrogen.The change in volume of the bar portion 14R being present in cylinder 12 along with the flexible of amortisseur 16, the therefore change of the volume of the bar portion 14R that the absorption of the gas 78 in annular chamber 74 is present in cylinder 12.

It is provided with the damping force of extended travel at the main part 14M of piston 14 to produce the power that declines that subtracts of valve 80 and retraction stroke and produce valve 82.The damping force of extended travel produces valve 80 and includes throttle orifice 80A, only allows room 68 from cylinder towards the flowing of the oil 76 of room under cylinder 70, to be produced the damping force of extended travel by circulating resistance during throttle orifice 80A by oily 76.Equally, the damping force of retraction stroke produces valve 82 and includes throttle orifice 82A, only allows room 70 from cylinder towards the flowing of the oil 76 of room on cylinder 68, to be produced the damping force of retraction stroke by circulating resistance during throttle orifice 82A by oily 76.

Damping force generation valve 84 and the damping force generation valve 86 of retraction stroke of extended travel it also is provided with at bottom valve assembly 66.The damping force of elongation row naked produces valve 84 and includes throttle orifice 84A, only allows the flowing of oil 76 towards room cylinder 70 from bottom valve room 72, is produced the damping force of extended travel by circulating resistance during throttle orifice 84A by oil 76.Equally, the damping force of retraction stroke produces valve 86 and includes throttle orifice 86A, only allows room 70 from cylinder towards the flowing of the oil 76 of bottom valve room 72, to be produced the damping force of retraction stroke by circulating resistance during throttle orifice 86A by oily 76.

As shown in Figures 2 and 3, on the length direction central part of outside cylinder 12Y and the surface of bottom of cylinder 12, in the way of circumferentially, it is fixed with the self discharge formula in strip except electrical equipment 90A and 90B by bonding.As it is shown on figure 3, at the peripheral part of spring base bolster 58 and the peripheral part of the installation portion 60A of dust cover 60, be fixed with the self discharge formula in strip except electrical equipment 90C and 90D by bonding in the way of circumferentially.And, at the upper surface of the housing 18A of upper supporting piece 18, to be fixed with the self discharge formula in strip except electrical equipment 90E by bonding in the way of radially vertically extending.

It is in wheel 28 under the loading condition of standard had not both upspring the position (hereinafter referred to as " normal place ") when also not rebounding additionally, the position of the piston 14 shown in Fig. 4 is vehicle.In the illustrated embodiment, self discharge formula is fixed on the surface of the outside cylinder 12Y of cylinder 12 except the liquid level place on the lower of the oil 76 in the electrical equipment 90A annular chamber 74 when being in normal place than piston 14.

Self discharge formula has identical structure except electrical equipment 90A～90E.Thus, only illustrate except electrical equipment 90A with reference to the Fig. 5 in the cross section except electrical equipment 90A before illustrating bonding.Except electrical equipment 90A by being attached with the sticker 94 of electric conductivity and covering the peeling paper 96 of sticker 94 and be installed on the composite sheet of sticker 94 and cut into the size of regulation and shape and formed by the metal forming 92 in electric conductivity.Except electrical equipment 90A is to carry out by peeling and utilize sticker 94 that metal forming 92 is bonded in component peeling paper 96 except the fixing of the component of electricity.

As shown in detail below, the face of the main side 92A of metal forming 92, the i.e. through-thickness of metal forming as described later except the discharge face function in electrical phenomena.Thus, in order to make except electrical phenomena is carried out effectively, the preferably side 92A of metal forming 92 has multiple protuberances 928 as small jut.Furthermore, it is also possible to by the surface 920 (upper surface of Fig. 5) of metal forming 92 applies to make the processing that surface roughness increases, and as the surface of metal forming 92 forms small jut multiple protuberances.

As shown in detail below, metal forming 92 can be formed by the arbitrary metal with electric conductivity, but is preferably formed by aluminum, gold, silver, copper or their alloy.Especially as this embodiment, in the case of being fixed on hardware except electrical equipment, except the metal forming of electrical equipment preferably has the electric conductivity higher than the metal material constituting hardware.And, so that the side of metal forming 92 has the thickness being enough to as discharge face function fully, and can deform in the way of tackling curved surface neatly and to fix, the thickness of metal forming is preferably from about about 50～200 μm.

In addition, except the flat shape of electrical equipment 90A is not limited to the rectangle of strip, can also be the polygon beyond rectangle, circle or oval such arbitrary shape, but be preferably able to shape such as rectangle, square, rhombus and the hexagon etc. sheared in the way of not having discarded part.And, except the size of electrical equipment 90A suitably sets according to its position of application, but in the case of being the most rectangular except electrical equipment 90A, can be minor face be a few mm～about tens mm, long limit is about tens mm～100mm.

As it was previously stated, when vehicle 20 travels, therefore vehicle with positive electric charge, can constitute amortisseur 16 component such as grade of damping force generator 10 also with positive electric charge.Generally, the carried charge of the electric charge of resin component element is higher than the carried charge of the electric charge of hardware, and the carried charge of the electric charge of oil is lower than the carried charge of the electric charge of hardware.In the case of damping force generator 10, the carried charge of resinous spring base bolster 58 and dust cover 60 is higher than the carried charge of metal piston 14 and cylinder 12, and the carried charge of oil 76 is lower than the carried charge of piston 14 and cylinder 12.

Thus, do not carry out except electrical equipment 90A etc. except electricity in the case of, the relation shown in solid that is regarded as in Fig. 6 of the relation by the charged current potential caused of positive electric charge of dust cover 60, piston 14, cylinder 12 and oil 76.As it was previously stated, repeatedly contact because tire 40 is repeated relative to road surface and peels off, produce positive electric charge and charged at wheel 28.Owing to cylinder 12 is linked to support the vehicle wheel frame 26 of wheel 28, therefore the carried charge of the electric charge of cylinder 12 is higher than piston 14.

In above-mentioned component and position, the current potential of oil 76 is minimum, but when the carried charge of cylinder 12 and piston 14 raises, these components with electric charge 76 can move to oil, as a result of which it is, the carried charge of oil 76 also raises, its viscosity raises.When the viscosity of oil 76 raises, oil 76 circulating resistances when throttle orifice 80A etc. also raise, and therefore damping force raises than original value, and the taking sense of vehicle declines.Thus it is preferred to by making the carried charge of oil 76 decline based on the electricity that removes except electrical equipment 90A etc..

Fig. 7 is the schematic explanatory diagram being illustrated based on the mechanism except electricity except electrical equipment 90A, is estimated as being carried out by the mechanism shown in Fig. 7 based on the electricity that removes except electrical equipment 90A.Additionally, in the figure 7, "+" and "-" is just representing respectively and negative electric charge or ion, " 0 " represents that electric charge is the situation of 0, is i.e. in by the situation of the state of charge neutrality.And, the arrow of solid line represents the flowing of air, and the arrow of dotted line represents the movement of electric charge or ion.

Air is with positive electric charge, but when the carried charge of the positive electric charge on resinous dust cover 60 is the most, air can be separated into positive air ion and negative air ion because of so-called corona discharge.Positive air ion because of dust cover 60 with positive electric charge between effect repulsion, and by from dust cover 60 away from the way of move.In contrast, negative air ion by dust cover 60 with positive electric charge between the Coulomb force of effect and be attracted, thus to move in the way of dust cover 60, dust cover 60 with positive electric charge to move in the way of the air ion born.

Disappearing as a result of which it is, produce charge neutrality, negative air ion and positive electric charge between negative air ion and positive electric charge, the electric charge of air becomes 0.Above phenomenon produces the most continuously, therefore by reduce dust cover 60 with positive electric charge and dust cover 60 by except electricity.Additionally, air be separated into the phenomenon of positive air ion and negative air ion etc. due to corona discharge the most active when the carried charge of dust cover 60 is the highest, thus, be estimated as except electricity act on carried charge the highest time the most active.It addition, be not limited to, based on the electricity that removes except electrical equipment 90A, the situation that air shown in Fig. 7 flows to a direction.

The result of the research of the experiment carried out according to the present application person, in the case of other shape of the size except the rectangle that metal forming 92 (aluminium foil of thickness 200 μm) is aforesaid size of electrical equipment 90A or same degree, the scope in the above-mentioned effect except electricity direction, face in one's power is the scope of radius about the 50mm that the central Pc of metal forming 92 rises.And, above-mentioned except the scope of the effect thickness direction in one's power of electricity be the effect except electricity in above-mentioned direction in one's power in the range of a few mm of the sticking veneer away from metal forming 92～the scope of about tens mm.Additionally, except the effect scope in one's power of electricity changes according to situations such as the carried charges of positive electric charge.

From the point of view of the general charged state of vehicle 20, spring base bolster 58 is closest with the part mutually abutted of upper spring seat 52 to be in the upper surface along dust cover 60 except the position of the central Pc of the aluminium foil 92 of electrical equipment 90C and removes in the range of electric effect direction, face in one's power.Equally, dust cover 60 is closest with the part mutually abutted of bar portion 14R is in the upper surface along dust cover 60 except the position of the central Pc of the metal forming 92 of electrical equipment 90D and removes in the range of electric effect direction, face in one's power.And, the outside cylinder 12Y of cylinder 12 is in the range of the thickness direction in one's power of the effect except electricity except electrical equipment 90A and 90B, and the housing 18A of upper supporting piece 18 is in the range of the thickness direction in one's power of the effect except electricity except electrical equipment 90E.

As in Fig. 6 by shown in double dot dash line, by based on except electrical equipment 90D except electricity, dust cover 60 with positive electric charge reduce and the current potential of dust cover 60 declines.Thus, piston 14 with positive electric charge reduce owing to moving to dust cover 60, the current potential of piston 14 declines.The current potential of piston 14 also because of by based on except electrical equipment 90C and 90E except electricity, the current potential of spring base bolster 58 and upper spring seat 52 declines respectively, the current potential of the housing 18A of upper supporting piece 18 declines, and decline.And, by based on except electrical equipment 90A and 90B except electricity, outside cylinder 12Y with positive electric charge reduce, thus the positive electric charge of cylinder 12 entirety reduces, thus the current potential of cylinder 12 declines.

Additionally, in the case of the hardware that outside cylinder 12Y is coated like that, film also with electric charge, but be close to the film except electrical equipment with electric charge owing to reducing to moving except electrical equipment.And, hardware with electric charge owing to being reduced to moving except electrical equipment by film.Additionally, from except electrical equipment away from position film with electric charge first move to hardware and move in hardware, moved to except electrical equipment by film from hardware.

Therefore, according to the first embodiment, make oil 76 that the cylinder 12 with amortisseur 16 and piston 14 connect with positive electric charge move to cylinder 12 and piston 14, it is possible to reduce the carried charge of the electric charge of oil 76.Additionally, when amortisseur 16 stretches, piston 14 carries out displacement relative to cylinder 12, and oil 76 is stirred, and the minimizing of the most positive electric charge substantially entirety for oil 76 is carried out.Thereby, it is possible to preventing oily 76 surpluses with the situation of positive electric charge, therefore, it is possible to prevent the viscosity of oil 76, because of the superfluous charged and superfluous rising of electric charge thus the damping force of amortisseur 16 becomes excessive.

Especially in accordance with the first embodiment, self discharge formula is fixed on the surface of the outside cylinder 12Y of cylinder 12 except the liquid level place on the lower of the oil 76 in the electrical equipment 90A annular chamber 74 when being in normal place than piston 14.Thus, with compared with the electrical equipment 90A situation on the surface being fixed on outside cylinder 12Y than the liquid level place by the top of the oil 76 in annular chamber 74, it is possible to effectively reduce the carried charge of the oil 76 in annular chamber 74 by outside cylinder 12Y except electricity.Additionally, the liquid level of the oil 76 that can also be positioned at the annular chamber 74 when being in normal place than piston 14 except part or all of electrical equipment 90A is located by the top.

It addition, according to the first embodiment, self discharge formula is fixed on the surface of the bottom of outside cylinder 12Y except electrical equipment 90B.Thus, compared with the situation on the surface of the bottom being not secured to outside cylinder 12Y except electrical equipment, it is possible to electric more effectively by removing of bottom based on the outside cylinder 12Y except electrical equipment 90B, the carried charge of side cylinder 12X is reduced via end cap 64.

Additionally, the present application person is by the experiment carried out for actual vehicle, it is possible to confirm following effect.That is, being not provided with self discharge formula except in the case of electrical equipment 90A～90E, the current potential of the oil 76 in inner cylinder 12X rises to hundreds of to about kilovolt.In contrast, according to the structure of the first embodiment, the current potential of the oil 76 in inner cylinder 12X only rises to about tens volts, it can be ensured that the suitable viscosity of oil 76.

[the second embodiment]

Fig. 8 is the partial sectional view of the major part of the damping force generator 10 illustrating the second embodiment of the present invention being applied to McPherson pillar front suspension with the state observed from the rear of vehicle, and Fig. 9 is the sectional view of the outline illustrating the single-barrel shock absorber shown in Fig. 8.Additionally, in Fig. 8 and Fig. 9, for the component corresponding with the component shown in Fig. 1 to Fig. 4, mark the symbol identical with the symbol marked in these figures.

The amortisseur 16 of the second embodiment is the amortisseur of input divergence type.Upper supporting piece 18 has interior barrel member 18B, outer barrel member 18C and is filled in the rubber bushing 18D between interior barrel member 18B and outer barrel member 18C.Stop collar 100 is had with chimeric with the state that shoulder 14S abuts in the front end of bar portion 14R.Interior barrel member 18B be clipped in stop collar 100 and and the nut 102 that screws togather of the front end of bar portion 14R between state be supported by, thus upper supporting piece 18 links with the front end of bar portion 14R.

Outer barrel member 18C abuts with vehicle body 22 at flange part 18F, is linked with vehicle body 22 at flange part 18F by bolt 104 and the nut 106 that screws togather with this bolt 104.It is configured with stopper 108 of upspringing in the lower section of outer barrel member 18C.Stopper 108 of upspringing is made up of main body 108A of rubber and the metal supporting mass 108B supported integratedly the upper end of main body 108A, and supporting mass 108B is engaged with the lower surface of outer barrel member 18C by means such as welding.Although the most not shown, but at least one party in outer barrel member 18C and supporting mass 108B is in a part for inner peripheral portion, directly or via having the elastic component of electric conductivity, contacts with stop collar 100 or bar portion 14R in the way of electric charge can move.

The dust cover 60 of this second embodiment is also by resin formation.Form spring base buffer part 60A substantially in annulus tabular in the upper end of dust cover 60, spring base buffer part 60A abuts with the lower surface of the flange part 18F of outer barrel member 18C.Upper spring seat 52 similarly function in the flange part 18F of outer barrel member 18C and the first embodiment, the spring base bolster 58 similarly function in spring base buffer part 60A and the first embodiment.

Lower spring cup 54 is configured with the lower spring cup bolster 110 of rubber.Spring base buffer part 60A and the lower spring cup bolster 110 spring force by compression helical spring 56, the upper surface of the lower surface and lower spring cup 54 that are respectively relative to the flange part 18F of outer barrel member 18C is supported by with the state being pressed.The damping force produced by amortisseur 16 transmits to vehicle body 22 via interior barrel member 18B, rubber bushing 18D and outer barrel member 18C from bar portion 14R.In contrast, the spring force of compression helical spring 56 transmits to vehicle body 22 via the flange part 18F of spring base buffer part 60A and outer barrel member 18C, thus spring force separates to the input of vehicle body 22 with damping force to the input of vehicle body 22.

As it is shown in figure 9, the amortisseur 16 of this embodiment is single-barrel shock absorber.At cylinder 12, between the main part 14M and end cap 64 of piston 14, it is configured with free-piston 112.Free-piston 112 can cooperate with main part 14M and form room 70 under cylinder along axis 12A relative to cylinder 12 displacement, cooperate with end cap 64 and form gas compartment 114.Gas 78 as nitrogen it are sealed with in gas compartment 114.Change with the volume of flexible and existing in the cylinder 12 bar portion 14R of amortisseur 16, therefore the change of the volume of the bar portion 14R that the absorption of the gas 78 in gas compartment 114 is present in cylinder 12.

As the situation of the double-drum type vibration damper shown in Fig. 4, it is provided with damping force generation valve 80 and the damping force generation valve 82 of retraction stroke of extended travel at the main part 14M of piston 14.Damping force produces valve 80 and 82 and constitutes in the same manner as the damping force generation valve 80 and 82 of the first embodiment respectively, similarly produces damping force.As the situation of the first embodiment, on the surface of the length direction central part of cylinder 12, in the way of circumferentially, it is fixed with the self discharge formula in strip except electrical equipment 90A by bonding.But, self discharge formula is not fixed except electrical equipment in the surface in the bottom of cylinder 12.

Additionally, in fig .9, position when piston 14 is also in the loading condition of standard with vehicle i.e. normal place illustrates.When piston 14 is in normal place, the scope along the direction of axis 12 residing for main part 14M is set to the scope 88 of regulation, and the self discharge formula of present embodiment is fixed on the surface of cylinder 12 except electrical equipment 90A in the scope 88 of regulation.

As shown in Figure 8, at the cylindric outer surface of spring base buffer part 60A, in the way of circumferentially, it is fixed with the self discharge formula in strip except electrical equipment 90C by bonding.As the situation of the first embodiment, the upper surface of outer barrel member 18C of the upper supporting piece 18 supported in the upper end of the bar portion 14R to piston 14, in the way of circumferentially, it is fixed with the self discharge formula in strip except electrical equipment 90E by bonding.

From the point of view of the general charged state of vehicle, in the part mutually abutted of spring base buffer part 60A and outer barrel member 18C, the position closest to the central authorities of the aluminium foil except electrical equipment 90C is in the range of the direction, face in one's power of the effect except electricity except electrical equipment 90C.And, cylinder 12 is in the range of the thickness direction in one's power of the effect except electricity except electrical equipment 90A, and outer barrel member 18C of upper supporting piece 18 is in the range of the thickness direction in one's power of the effect except electricity except electrical equipment 90E.

Therefore, by based on except electrical equipment 90C except electricity, spring base buffer part 60A of dust cover 60 with positive electric charge reduce and the current potential of spring base buffer part 60A declines.Thus, piston 14 with positive electric charge reduce owing to moving to dust cover 60 via outer barrel member 18C, the current potential of piston 14 declines.By based on except electrical equipment 902 except electricity, the current potential of outer barrel member 18C of upper supporting piece 18 declines, and thus the current potential of piston 14 also declines.And, by based on except electrical equipment 90A except electricity, cylinder 12 with positive electric charge reduce, thus the current potential of cylinder 12 declines.

Thus, according to the second embodiment, as the situation of the first embodiment, make the oil 76 connected with cylinder 12 and piston 14 with positive electric charge move to cylinder 12 and piston 14, it is possible to reduce the carried charge of electric charge of oil 76.Therefore, it is possible to preventing oily 76 surpluses with positive electric charge, therefore, it is possible to prevent the viscosity of oil 76 from raising to surplus because of the charged of superfluous electric charge thus the damping force of amortisseur 16 becomes excessive.

Especially in accordance with the second embodiment, self discharge formula is fixed on the surface of cylinder 12 except electrical equipment 90A in the scope 88 of regulation.Thereby, it is possible to the electric charge of the cylinder 12 efficiently reduced in the scope 88 of regulation, it is possible to efficiently reduce when piston 14 is in normal place the carried charge of the oil 76 of the surrounding in region residing for main part 1.Additionally, in this second embodiment, except electrical equipment 90A is fixed on the surface of cylinder 12 in the scope 88 of regulation but it also may be in addition to part or all of electrical equipment 90A is positioned at the scope 88 of regulation.In this case, it is also possible to by reducing the electric charge of cylinder 12, reduce the carried charge of oil 76 in cylinder 12.

As the situation of the first embodiment, the present application person is by the experiment carried out for actual vehicle, it is possible to confirm following effect.That is, being not provided with self discharge formula except in the case of electrical equipment 90A, 90C and 90E, the current potential of the oil 76 in cylinder 12 rises to hundreds of to about kilovolt.In contrast, according to the structure of the second embodiment, the current potential of oil 76 only rises about tens volts, it can be ensured that the suitable viscosity of oil 76.

[the 3rd embodiment]

Figure 10 and Figure 11 is to be denoted as the amortisseur of Dual-drum damping force type variable and the amplification view of the outline of amortisseur 16 in the damping force generator 10 of third embodiment of the present invention that constitutes.Especially, Figure 10 illustrates that extended travel, Figure 11 illustrate retraction stroke.The amortisseur 16 of the 3rd embodiment is constituted as so-called uniflow type damping force type variable amortisseur.

As shown in Figures 10 and 11, between inner cylinder 12X and outside cylinder 12Y, it is configured with the metal middle cylinder 12M extended with one heart with these cylinders along axis 12A.Middle cylinder 12M is configured to isolate with inner cylinder 12X and outside cylinder 12Y diametrically, is fixed on inner cylinder 12X in upper end and lower end by means such as welding, thus forms annulus 120 between itself and inner cylinder 12X.The upper end of annulus 120 is connected with room on cylinder 68 by being located at the intercommunicating pore 121 of inner cylinder 12X.

At middle cylinder 12M and outside cylinder 12Y, it is fixed with the metal conduit 122 vertically extended with axis 12A by means such as welding.Conduit 122 connects with annulus 120 at one end, and at the other end, the one end with the internal path 126 being located in virtual channel sectional area variset 124 is connected.Internal path 126 connects with annular chamber 74 at the other end, at one end and be provided with variable orifice 128 between the other end.

Thus, annulus 120, conduit 122 and internal path 126 are formed and are connected with the annular chamber 74 as storeroom and have the bypass 130 of variable orifice 128 halfway in room 68 on the cylinder residing for the bar portion 14R of piston 14.In Figure 10 and Figure 11 as shown by arrows, bypass 130 only allows the flowing from annulus 120 towards the oil 76 of annular chamber 74.

The housing 132 of virtual channel sectional area variset 124 is formed by metal, in substantial cylindric with what axis 12A vertically extended.Housing 132 is fixed on outside cylinder 12Y by the means of welding etc., contains electromagnetic actuator 134 in housing 132.Electromagnetic actuator 134 is controlled by the electronic-controlled installation not shown in figure, is driven by the valve key element not shown in the figure of variable orifice 128 and makes the virtual channel sectional area of variable orifice 128 change.Virtual channel sectional area variset 124 is configured to make electric charge move to housing 132 from the oil 76 as hydraulic fluid through bypass 130.

Additionally, virtual channel sectional area variset 124 has the variable orifice 128 of the midway being arranged on bypass 130, as long as the virtual channel sectional area of variable orifice 128 can be made to change by controlling, can have arbitrary structure.If necessary, as the object lesson of virtual channel sectional area variset 124, can refer to such as Japanese Unexamined Patent Publication 2007-225111 publication, Japanese Unexamined Patent Publication 11-30265 publication and Japanese Unexamined Patent Publication 6-33969.

Knowable to the comparison of Figure 10 and Figure 11 and Fig. 4, in this embodiment, the damping force being provided with retraction stroke at the main part 14M of piston 14 produces valve 82, but the damping force being not provided with extended travel produces valve 80.Otherwise, the damping force being provided with extended travel at bottom valve assembly 66 produces valve 84, but the damping force being not provided with retraction stroke produces valve 86.

Thus, in the extended travel of amortisseur 16, as shown by the arrows in Figure 10, on cylinder, the oil 76 in room 68 moves to annular chamber 74 via bypass 130.And, oil 76 produces valve 84 room 70 under cylinder via the damping force of bottom valve room 72 and the extended travel of bottom valve assembly 66 and moves.Therefore, circulating resistance when passing through, by oil 76, the variable orifice 128 being located at bypass 130 and the oil 76 circulating resistances when damping force produces valve 84, and produce the damping force of extended travel.

In contrast, in the retraction stroke of amortisseur 16, as shown in arrow in Figure 11, under cylinder, the oil 76 in room 70 moves via damping force generation valve 82 room 68 on cylinder.The volume of the bar portion 14R of the piston 14 being present in inner cylinder 12X increases, and therefore suitable with its volume oil 76 room 68 from cylinder is moved to annular chamber 74 via bypass 130.Therefore, the damping force of retraction stroke is produced by circulating resistance in time being located at the variable orifice 128 of bypass 130 of the oil 76 circulating resistance when damping force produces valve 82 and oil 76.

From the above description, either at extended travel or the retraction stroke of amortisseur 16, oil 76 all from cylinder room 68 uniaxially move to annular chamber 74 via bypass 130.Therefore, variable orifice 128 produces valve function as the damping force shared in extended travel and retraction stroke, and the virtual channel sectional area of variable orifice 128 is controlled by electromagnetic actuator 134, thus the damping force change of extended travel and retraction stroke.

As the situation of first and second above-mentioned embodiment, on the length direction central part of outside cylinder 12Y and the surface of bottom of cylinder 12, in the way of circumferentially, it is fixed with the self discharge formula in strip except electrical equipment 90A and 90B by bonding.On the surface of the housing 132 of virtual channel sectional area variset 124, in the way of circumferentially, it is fixed with the self discharge formula in strip except electrical equipment 90I by bonding.In addition, although not shown in Figure 10 and Figure 11, but as the situation of the first above-mentioned embodiment, the upper surface etc. of the outer barrel member of the upper supporting piece supported in the upper end of the bar portion 14R to piston 14, the self discharge formula in strip that is fixed with also by bonding is except electrical equipment.

According to the 3rd embodiment, as the situation of the first above-mentioned embodiment, it is possible to by self discharge formula except electrical equipment 90A etc., inner cylinder 12X, outside cylinder 12Y and piston 14 are carried out except electricity.Thereby, it is possible to make oil 76 in amortisseur 16 with positive electric charge cylinder 12Y and piston 14 etc. laterally move, it is possible to reduce the carried charge of the electric charge of the oil 76 in amortisseur 16.

Especially in accordance with the 3rd embodiment, except electrical equipment 90I, the housing 132 of virtual channel sectional area variset 124 is carried out except electricity by self discharge formula, either extended travel or retraction stroke, oil 76 all from cylinder room 68 move to annular chamber 74 via bypass 130.Thus, make in bypass 130 oil 76 of flowing with positive electric charge move to the housing 132 of virtual channel sectional area variset 124, it is possible to reduce the carried charge of the electric charge of the oil 76 circulated via bypass 130.Therefore, self discharge formula is not fixed with the surface at housing 132 except compared with the situation of electrical equipment 90I, it is possible to be effectively prevented because of oil that 76 the damping force of amortisseur 16 becomes excessive with electric charge.

[the 4th embodiment]

Figure 12 is to be shown as the amortisseur of single cylinder type damping force type variable and the amplification view of the outline of amortisseur 16 in the damping force generator 10 of the 4th embodiment of the present invention that constitutes.

According to the comparison of Figure 12 Yu Fig. 9～Figure 11, the amortisseur 16 of the 4th embodiment is constituted as single cylinder type damping force type variable amortisseur.On cylinder, room 68 connects the one end having the first conduit 138, and the other end of the first conduit 138 is connected with the one end of the internal path 142 being arranged in the first virtual channel sectional area variset 140.Internal path 142 is connected with room under cylinder 70 at the other end, is provided with the first variable orifice 144 and the first check-valves 146 between one end and the other end of internal path 142.Check-valves 146 allow oil 76 from cylinder room 68 to the movement of room under cylinder 70, but stop oil 76 from cylinder room 70 to the movement of room on cylinder 68.

Equally, on cylinder, room 68 connects the one end having the second conduit 148, and the other end of the second conduit 148 is connected with the one end of the internal path 152 being located in the second virtual channel sectional area variset 150.Internal path 152 is connected with room under cylinder 70 at the other end, is provided with the second variable orifice 154 and the second check-valves 156 between one end and the other end of internal path 152.Check-valves 156 allow oil 76 from cylinder room 70 via internal path 152 to the movement of room on cylinder 68, but stop oil 76 from cylinder room 68 via internal path 152 to the movement of room under cylinder 70.

First conduit 138 and internal path 142 are formed and are connected with room under cylinder 70 room on cylinder 68 and have the first variable orifice 144 and the first bypass 158 of the first check-valves 146 in midway.Equally, the second conduit 148 and internal path 152 are formed and are connected with room under cylinder 70 room on cylinder 68 and have the second variable orifice 154 and the second bypass 160 of the second check-valves 156 in midway.

The housing 162 of the first virtual channel sectional area variset 140 is formed by metal, in substantial cylindric with what axis 12A vertically extended.Housing 162 is fixed on cylinder 12 by means such as welding, contains electromagnetic actuator 164 in housing 162.Electromagnetic actuator 164 is controlled by the electronic-controlled installation not shown in figure, is driven by the valve key element not shown in the figure of the first variable orifice 144 and makes the virtual channel sectional area of the first variable orifice 144 change.First virtual channel sectional area variset 140 is configured to make electric charge move to housing 162 from the oil 76 through the first bypass 158.

Equally, the housing 166 of the second virtual channel sectional area variset 150 is formed by metal, in substantial cylindric with what axis 12A vertically extended.Housing 166 is fixed on cylinder 12 by means such as welding, contains electromagnetic actuator 168 in housing 166.Electromagnetic actuator 168 is controlled by the electronic-controlled installation not shown in figure, is driven by the valve key element not shown in the figure of the second variable orifice 154 and makes the virtual channel sectional area of the second variable orifice 154 change.Second virtual channel sectional area variset 150 is configured to make electric charge move to housing 166 from the oil 76 through the second bypass 160.

In the extended travel of amortisseur 16, as shown in the arrow of the dotted line in Figure 12, on cylinder, the oil 76 in room 68 moves via damping force generation valve 80 room 70 under cylinder of the extended travel of the main part 14M being located at piston 14.And, on cylinder, the oil 76 in room 68 moves via the first bypass 158 room 70 under cylinder.Therefore, through circulating resistances during the first variable orifice 144 being located at the first bypass 158 by the oil 76 circulating resistance and oily 76 when damping force produces valve 80, and produce the damping force of extended travel.The damping force of extended travel is made to change by utilizing electromagnetic actuator 164 to control the virtual channel sectional area of the first variable orifice 144.

Especially under the situation that the virtual channel sectional area of the first variable orifice 144 is less than the virtual channel sectional area that damping force produces valve 80, oil 76 preferentially produces valve 80 through damping force.But, under the situation of the virtual channel sectional area producing valve 80 at the virtual channel sectional area of the first variable orifice 144 more than damping force, oil 76 is preferential through the first variable orifice 144.

In contrast, in the retraction stroke of amortisseur 16, as shown in the arrow of the solid line in Figure 10, under cylinder, the oil 76 in room 70 moves via damping force generation valve 82 room 68 on cylinder of the retraction stroke of the main part 14M being located at piston 14.And, under cylinder, the oil 76 in room 70 moves via the second bypass 160 room 68 on cylinder.Therefore, through circulating resistances during the second variable orifice 154 being located at the second bypass 160 by the oil 76 circulating resistance and oily 76 when damping force produces valve 82, and produce the damping force of retraction stroke.By utilizing electromagnetic actuator 168 to control the virtual channel sectional area of the second variable orifice 154, and the damping force of retraction stroke is made to change.

As the situation of extended travel, under the situation of the virtual channel sectional area producing valve 82 at the virtual channel sectional area of the second variable orifice 154 less than damping force, oil 76 preferentially produces valve 82 through damping force.But, under the situation of the virtual channel sectional area producing valve 82 at the virtual channel sectional area of the second variable orifice 154 more than damping force, oil 76 is preferential through the second variable orifice 154.

As the situation of other above-mentioned embodiment, on the surface of length direction central part of the outside cylinder 12Y of cylinder 12, in the way of circumferentially, it is fixed with the self discharge formula in strip except electrical equipment 90A by bonding.On the surface of the housing 162 and 166 of first and second virtual channel sectional area variset 140 and 150, in the way of circumferentially, it is fixed with the self discharge formula in strip respectively by bonding except electrical equipment 90J and 90K.In addition, although it is the most not shown, but as the situation of other above-mentioned embodiment, the upper surface etc. of the outer barrel member of the upper supporting piece supported in the upper end of the bar portion 14R to piston 14, the self discharge formula in strip that is fixed with also by bonding is except electrical equipment.

According to the 4th embodiment, as the situation of the second above-mentioned embodiment, it is possible to cylinder 12 and piston 14 are carried out except electricity except electrical equipment 90A etc. by self discharge formula.Thereby, it is possible to make on cylinder the oil 76 in room 70 under room 68 and cylinder with positive electric charge move to cylinder 12 and piston 14 etc., it is possible to reduce on cylinder the carried charge of the electric charge of the oil 76 in room 70 under room 68 and cylinder.

Especially in accordance with the 4th embodiment, carry out, except electricity, being carried out the housing 166 of the second virtual channel sectional area variset 150 except electricity except electrical equipment 90K by self discharge formula to the housing 162 of the first virtual channel sectional area variset 140 except electrical equipment 90J by self discharge formula.Thus, make in first and second bypass 158 and 160 oil 76 of flowing with positive electric charge move to housing 162 and 166 respectively, it is possible to reduce the carried charge of the electric charge of oil 76.Therefore, self discharge formula is fixed the most respectively with the surface at housing 162 and 166 except compared with the situation of electrical equipment 90J and K, it is possible to be effectively prevented because of oil that 76 the damping force of amortisseur 16 becomes excessive with electric charge.

From the above description, in above-mentioned each embodiment except electrical equipment 90A etc. be that the self discharge formula of the ungrounded type of so-called ion isolation formula is except electrical equipment.I.e., except electrical equipment 90A etc. divides air into positive air ion and negative air ion by corona discharge, by the member of formation of damping force generator 10 with positive electric charge and the charge neutrality of negative air ion and carry out except electricity, it is not necessary to the earthy distribution of electrical resistance.Therefore, compared with the situation of the electrostatic removal device used described in aforesaid patent documentation, it is possible to simplify the structure removing electricity in damping force generator 10, and can be greatly decreased for the cost needed for realizing except electricity.

Especially in accordance with above-mentioned each embodiment, it is possible to by reducing the carried charge of the electric charge of cylinder 12 except electrical equipment 90A etc., and by reducing the carried charge of the electric charge of piston 14 except electrical equipment 90C etc..Thus, compared with the situation of the minimizing carrying out the carried charge of electric charge with the only side in cylinder 12 and piston 14, it is possible to efficiently reducing the carried charge of the electric charge of oil 76, the damping force that it is possible to be effectively prevented amortisseur 16 becomes excessive.

It addition, in the first embodiment, except electrical equipment 90C and 90D is separately fixed at the peripheral part of resinous spring base bolster 58 and the peripheral part of the installation portion 60A of resinous dust cover 60.Equally, in this second embodiment, the peripheral part of spring base buffer part 60A of resinous dust cover 60 it is fixed on except electrical equipment 90C.Resinous component with electric charge amount more than metal component with the amount of electric charge, therefore compared with the situation being fixed on metal component except electrical equipment, it is possible to effectively carry out component except electricity.Thus, by resinous component is carried out except electricity, make piston 14 with electric charge move to resinous component via bar portion 14R, it is possible to efficiently reduce the carried charge of the electric charge of piston 14.

It addition, according to first and second embodiment, in the case of self discharge formula is arranged at resinous spring base bolster 58 and/or dust cover 60 except electrical equipment, except electrical equipment is the most directly fixed on these components by bonding.Thus, it is not necessary to add for thus without causing the complication of structure and/or the cost increase of damping force generator 10, and the carried charge of the electric charge of the oil 76 of amortisseur 16 will can be reduced except the fixing special component of electrical equipment.Additionally, also confirm: even if spring base bolster 58 and/or dust cover 60 are rubber system, by fixing self discharge formula in the same manner as the situation of first and second embodiment except electrical equipment, it is also possible to reduce the carried charge of the electric charge of oil 76.

Additionally, according to the 3rd and the 4th embodiment, in the amortisseur 16 of damping force type variable, it is provided with self discharge formula except electrical equipment 90I etc. making the surface being located at virtual channel sectional area variset 124 grade of the virtual channel sectional area change of variable orifice 128 grade of bypass 130.Raises because of the charged of superfluous electric charge thus damping force becomes surplus therefore, it is possible to be effectively prevented the viscosity of hydraulic fluid through variable orifice 128 grade.

Additionally, according to above-mentioned each embodiment, it is attached with the form of the band of the sticker 94 of electric conductivity in the metal forming 92 in electric conductivity except electrical equipment 90A etc., except electrical equipment is to carry out by utilizing sticker 94 that metal forming 92 is bonded in component except the fixing of the component of electricity.Thereby, it is possible to easily will carry out being fixed on the surface of the component removing electricity except the metal forming of electricity by bonding.It is additionally, since adhering agent layer and there is electric conductivity, therefore compared with the situation that adhering agent layer does not have electric conductivity, it is possible to effectively carry out electric charge from specific component to the movement of metal forming, it is possible to improve except the effect of electricity.Additionally, if the thickness of adhering agent layer is tens～about hundreds of μm, even if then adhering agent layer does not have electric conductivity, electric charge also is able to move to metal forming from specific component.Thus, adhering agent layer can not also have electric conductivity.

Above, it is described in detail by the present invention about specific embodiment, but the present invention is not limited to above-mentioned embodiment, it is possible to use other various embodiments to be apparent to those skilled in the art within the scope of the invention.

Such as, in above-mentioned each embodiment, constituting the component of amortisseur 16 and the Accessory Members that is connected with amortisseur is fixed with self discharge formula except electrical equipment 90A etc. but it also may omit and remove electrical equipment arbitrarily.

Equally, in the second above-mentioned embodiment, constituting the component of amortisseur 16 and the Accessory Members that is connected with amortisseur is fixed with self discharge formula except electrical equipment 90A, 90C and 90E, but any one removed in electrical equipment 90A, 90D and 90E can also omitted.

It addition, above-mentioned each embodiment is fixed on specific position as the rear side of vehicle except electrical equipment 90A etc. relative to the axis 12A of amortisseur 16.But, the position of the surrounding of the axis 12A fixed except electrical equipment be may not be the position of above-mentioned embodiment.

It addition, except fixing number and/or the bearing of trend of electrical equipment are not limited to the number in above-mentioned each embodiment and/or bearing of trend.Such as, as in Figure 13 as shown in fixed case, be fixed at the lower section of lower spring cup 54 cylinder 12 except electrical equipment 90A can also for multiple, and, except electrical equipment 90A can also fix along axis 12A with extending.Additionally, as in the first embodiment, in the case of the bottom of cylinder 12 is fixed with bracket 24, it is also possible to fix self discharge formula except electrical equipment 90F at bracket 24.

Especially in the case of the first and the 3rd amortisseur 16 embodiment is double-drum type vibration damper, it is also possible to fix self discharge formula on the surface of outside cylinder 12Y or the surface of end cap 62 close to the upper end of cylinder 12 except electrical equipment 90G.In this case, compared with the situation of the first embodiment, it is possible to upper end or end cap 62 to outside cylinder 12Y carry out, except electricity, it is possible to efficiently reduce the carried charge of the electric charge of the oil 76 of inner cylinder 12X and inside thereof effectively.In addition it is also possible to the peripheral part at upper spring seat 52 fixes self discharge formula except electrical equipment 90H.

It addition, the amortisseur 16 of the first embodiment is double-cylinder type but it also may be single-barrel shock absorber.Equally, the amortisseur 16 of the second embodiment is single-cylinder type but it also may be double-drum type vibration damper.

It addition, in the 4th above-mentioned embodiment, the virtual channel sectional area of the first variable orifice 124 and the second variable orifice 134 is controlled by corresponding electromagnetic actuator 144 and electromagnetic actuator 148 respectively.However, it is also possible to be modified to the such as first variable orifice 124 and the second variable orifice 134 is formed by a guiding valve and guiding valve is driven by an electromagnetic actuator.In this case, virtual channel sectional area variset can be one, therefore compared with the 4th above-mentioned embodiment, it is possible to reduces components number, and self discharge formula also is able to reduce except the number of electrical equipment.

And, in the above-described embodiment, suspension is McPherson candle suspension.But, the suspension of damping force generator of the application present invention can also be suspension other any form of suspension such of the suspension of such as double wish-bone arm type, the suspension of trailing arm type, axle type.

[symbol description]

null10 ... damping force generator，12 ... cylinder，14 ... piston，16 ... amortisseur，18 ... upper supporting piece，22 ... vehicle body，26 ... vehicle wheel frame，52 ... upper spring seat，58 ... spring base bolster，60 ... dust cover，76 ... oil，80、82 ... damping force produces valve，80A、82A ... throttle orifice，84、86 ... damping force produces valve，84A、86A ... throttle orifice，90A～90K ... self discharge formula removes electrical equipment，92 ... metal forming，124 ... virtual channel sectional area variset，128 ... variable orifice，130 ... bypass，140 ... the first virtual channel sectional area variset，144 ... the first variable orifice，150 ... the second virtual channel sectional area variset，154 ... the second variable orifice，158 ... the first bypass，160 ... the second bypass.

Claims (7)

1. the damping force generator of a vehicle, including amortisseur, described amortisseur has cylinder and piston, described piston forms two cylinder chamber can be embedded in described cylinder in the way of moving back and forth and cooperate with described cylinder, described amortisseur is linked with the spring upper member of vehicle and a side of spring lower member by the bar portion of described piston, linked by the opposing party of described cylinder with described spring upper member and described spring lower member, described amortisseur is configured to by the circulating resistance when the throttle orifice of the main part that process is located at described piston moves between said two cylinder chamber hydraulic fluid with described spring upper member and the relative displacement of described spring lower member, and produce damping force, wherein,

Surface configuration in particular elements has self discharge formula except electrical equipment, and described particular elements is the component constituting described amortisseur and at least one party in the Accessory Members being connected with described amortisseur,

Described self discharge formula is that air ion conversion type self discharge formula is except electrical equipment except electrical equipment, be configured to according to described particular elements with the carried charge of positive electric charge, described self discharge formula is made to be changed to, except the air of surrounding of electrical equipment, the air ion born, electricity is removed by being neutralized to the positive charge attraction of described particular elements by described air ion, the carried charge making described particular elements declines, so that the carried charge of described hydraulic fluid declines.

The damping force generator of vehicle the most according to claim 1, wherein,

Described particular elements is the resinous dust cover as Accessory Members being connected with described bar portion, described self discharge formula is arranged at the surface of described dust cover except electrical equipment, and described bar portion and described dust cover can connect by electric charge in the way of described bar portion moves to described dust cover.

The damping force generator of vehicle the most according to claim 1, wherein,

Described amortisseur is to have the inner cylinder chimeric for described piston and the Dual-drum amortisseur of the outside cylinder around this inner cylinder, described particular elements is described outside cylinder, and described self discharge formula is located at the surface of described outside cylinder except electrical equipment liquid level place on the lower of described hydraulic fluid between described inner cylinder and described outside cylinder when being in the loading condition of standard than described vehicle.

The damping force generator of vehicle the most according to claim 1, wherein,

Described amortisseur is Dual-drum amortisseur, has:

Inner cylinder, is fitted together to for described piston；

Outside cylinder, around described inner cylinder and between described outside cylinder and described inner cylinder formed storeroom；

Bottom valve assembly；With

End cap, by described inner cylinder and the end-enclosed of described outside cylinder and cooperate with described bottom valve assembly and delimit the bottom valve room that connects with described storeroom,

Described particular elements is at least one party in described outside cylinder and described end cap, and electric charge can move to described particular elements from described inner cylinder.

The damping force generator of vehicle the most according to claim 1, wherein,

Described amortisseur is single cylinder type amortisseur, described particular elements is described cylinder, the scope in the direction of the described relative displacement residing for the main part of described piston when being in the loading condition of standard at described vehicle is set to the scope of regulation, and described self discharge formula is arranged at the surface of described cylinder except a part for electrical equipment except electrical equipment in the way of the most described self discharge formula is positioned in the range of described regulation.

The damping force generator of vehicle the most according to claim 1, wherein,

Described amortisseur is damping force type variable amortisseur, there is bypass, variable orifice and virtual channel sectional area variset, described bypass is walked around the main part of described piston and said two cylinder chamber is connected, described variable orifice is located at described bypass, described virtual channel sectional area variset makes the virtual channel sectional area of described variable orifice change, described damping force type variable amortisseur is configured to when described piston carries out displacement relative to described cylinder, the at least some of of described hydraulic fluid in the described cylinder chamber of one side moves to the described cylinder chamber of the opposing party via described bypass, described particular elements is virtual channel sectional area variset, electric charge can move to described virtual channel sectional area variset from the described hydraulic fluid through described bypass.

7. according to the damping force generator of the vehicle according to any one of claim 1～6, wherein,

Described self discharge formula has except electrical equipment:

The metal forming of electric conductivity, has multiple small concavo-convex in the side of periphery；With

Adhering agent layer, on the face of the side being attached to this metal forming,

Described self discharge formula is fixed on described particular elements except electrical equipment by the bonding of described adhering agent layer.