Pilot-operated hydraulic shock absorber for a motor vehicle
First Claim
1. A pilot-operated hydraulic shock absorber for a motor vehicle, comprising:
- a working cylinder having a cylinder axis, a piston rod and a piston coaxially disposed in said working cylinder;
saidpiston defining in said working cylinder first and second chambers filled with a damping fluid;
an outer fluid reservoir communicatingly connected to said working cylinder, passage means for allowing said outer fluid reservoir to fluidically communicate with said first chamber;
an end piece disposed at an end of said working cylinder and closing said first chamber opposite said piston;
said passage means being disposed in said end piece and including a solenoid-operated rotary valve disposed concentrically around said piston rod, said rotary valve being comprised of;
a stator fixedly mounted in said end piece;
a rotor disposed in said end piece and being rotatable about said cylinder axis;
said rotor including adjustment means for selectively throttling said passage means and adjusting a pressure drop in the fluid across said passage means;
said adjustment means including projections integrally formed on said rotor for selectively closing and opening said passage means fluidically connecting said first chamber and said outer fluid reservoir;
said rotor and said stator defining at least one air gap therebetween;
means in the form of an electric coil for establishing a magnetic field in said end piece;
means for rotatingly biasing said rotor in a given direction;
said stator, said rotor, said at least one air gap, and said coil forming a part of an electro-magnetic circuit in which the magnetic field established by said electric coil causes selective rotation of said rotor in a direction opposite said given direction and against said biasing means for selectively throttling said passage means.
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Accused Products
Abstract
The shock absorber comprises a working cylinder (3) in which a piston (1) integral with a rod (2) defines two chambers (7, 8). In accordance with the invention, a rotary solenoid valve is placed in an end piece closing the working cylinder so as to control the circulation of the damping liquid between one chamber (7) and a reservoir (10). The solenoid valve comprises a passage (18, 22, 19) for the liquid between this cheer and this reservoir and closing devices (21, 21'"'"', 21", 21"'"'"') for the selective throttling of the passage. The closing devices are integral with a rotor (27) mounted on a bearing (33), opposite a stator (26) forming part of a magnetic circuit (25, 26, 27) excited by an electric coil (24). Air gaps extending parallel to the axis of rotation of the rotor (27) are formed between the stator and the rotor. Feeding the coil (24) brings about the rotation of the rotor (27) and the closing devices ( 21) integral with the latter, in order to cause the throttling of the passage to vary.
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Citations
11 Claims
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1. A pilot-operated hydraulic shock absorber for a motor vehicle, comprising:
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a working cylinder having a cylinder axis, a piston rod and a piston coaxially disposed in said working cylinder;
saidpiston defining in said working cylinder first and second chambers filled with a damping fluid; an outer fluid reservoir communicatingly connected to said working cylinder, passage means for allowing said outer fluid reservoir to fluidically communicate with said first chamber; an end piece disposed at an end of said working cylinder and closing said first chamber opposite said piston; said passage means being disposed in said end piece and including a solenoid-operated rotary valve disposed concentrically around said piston rod, said rotary valve being comprised of; a stator fixedly mounted in said end piece; a rotor disposed in said end piece and being rotatable about said cylinder axis;
said rotor including adjustment means for selectively throttling said passage means and adjusting a pressure drop in the fluid across said passage means;
said adjustment means including projections integrally formed on said rotor for selectively closing and opening said passage means fluidically connecting said first chamber and said outer fluid reservoir;said rotor and said stator defining at least one air gap therebetween; means in the form of an electric coil for establishing a magnetic field in said end piece; means for rotatingly biasing said rotor in a given direction; said stator, said rotor, said at least one air gap, and said coil forming a part of an electro-magnetic circuit in which the magnetic field established by said electric coil causes selective rotation of said rotor in a direction opposite said given direction and against said biasing means for selectively throttling said passage means. - View Dependent Claims (2, 3, 4, 5)
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6. A pilot-operated hydraulic shock absorber for a motor vehicle, comprising:
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a working cylinder having a cylinder axis, a piston rod and a piston coaxially disposed in said working cylinder;
said piston defining in said working cylinder first and second chambers filled with a damping fluid;an outer fluid reservoir communicatingly connected to said working cylinder, passage means for allowing said outer fluid reservoir to fluidically communicate with said first chamber; an end piece disposed at an end of said working cylinder and closing said first chamber opposite said piston; said passage means being disposed in said end piece and including a solenoid-operated rotary valve disposed concentrically around said piston rod, said rotary valve being comprised of; a stator fixedly mounted in said end piece; a rotor disposed in said end piece and being rotatable about said cylinder axis;
said rotor including adjustment means for selectively throttling said passage means and adjusting a pressure drop in the fluid across said passage means;said rotor and said stator defining at least one air gap therebetween; means in the form of an electric coil for establishing a magnetic field in said end piece; means for rotatingly biasing said rotor in a given direction; said stator, said rotor, said at least one air gap, and said coil forming a part of an electro-magnetic circuit in which the magnetic field established by said electric coil causes selective rotation of said rotor in a direction opposite said given direction and against said biasing means for selectively throttling said passage means; an annular member disposed around and surrounding said adjustment means, said annular member having at least one radial opening formed therein, said at least one opening being a part of said passage means, said adjustment means for throttling said passage means including a circular rotary hydraulic slide valve disposed on said rotor and having at least one closing device for sliding over said at least one radial opening, for selectively closing and progressively opening said radial opening as a function of an angle of rotation of said rotor. - View Dependent Claims (7, 8, 9, 10, 11)
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Specification