Brakes – Internal-resistance motion retarder – Motion damped from condition detected outside of retarder
Patent
1997-06-09
1999-04-06
Young, Lee W.
Brakes
Internal-resistance motion retarder
Motion damped from condition detected outside of retarder
188281, 18832214, F16D 5700
Patent
active
058905685
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a continuously variable twin-tube shock damper comprising: non-return valve which permits only an upward flow through the said passage with negligible damping capacity, cylinder between the piston and the baseplate, rod and through the said disc, arranged between the bottom of the central tube, damping valve as a function of electrical signals which are at least related to the movement of bodywork and/or chassis, which servo-control means comprise an excitation chamber as well as a coil positioned in the vicinity of a permanent magnet, which coil can be excited by the said electrical signals in order to control the pressure in the excitation chamber below the valve body of the damping valve, excitation chamber, wherein the position of the control valve can be changed by excitation of the coil and the pressure in the excitation chamber is determined, on the one hand, by inflow of fluid via a narrow passage and, on the other hand, by outflow of fluid through the control valve.
A damper of this type is disclosed in WO 96/08950.
The aim of the invention is so to improve the damper disclosed in the above publication that the movements of the valve body and the control valve are separately damped.
According to the invention, to this end the damper according to the preamble is characterized in orifices, guided in a valve shaft guide, hollow space of the hollow shaft and cooperating with the valve shaft guide so that the orifices are covered or uncovered--depending on the position of the hollow shaft relative to the valve shaft guide, spring means in the direction of the damping valve body.
If both the guide cylinder of the control valve piston and the guide of the control valve shaft have play in the radial direction, a low-friction position control of the control valve can be achieved with low coil forces. An out-of-true position or jamming cannot occur.
The invention will be explained in more detail below with reference to the figures.
FIG. 1 shows a longitudinal section of a first embodiment.
FIG. 2 shows a longitudinal section of the bottom section of the embodiment according to FIG. 1 on a larger scale.
FIG. 3 shows a longitudinal section of the bottom section of a second embodiment.
The continuously variable twin-tube shock damper shown in FIG. 1 comprises a working cylinder, constructed as inner tube 1, an outer tube 2, a reservoir 3 between the working cylinder and the outer tube, a piston 4, which is movable within the working cylinder, a hollow piston rod 5 with fixing eye 5a, which can be connected to the sprung part of a wheel suspension unit, a cover 6 which closes off the working cylinder and the reservoir and forms a guide for the piston rod, a disc or foot valve housing 7 at the bottom of the working cylinder and a baseplate 8 with fixing eye 8a at the bottom of the outer tube.
A central tube 10, the bottom end of which protrudes through the foot valve housing 7, extends through the piston 4.
Openings 11 are made in the piston rod just above the piston 4, which openings connect the base above the piston to the interior of the piston rod 5. The top of the central tube 10 is located above the opening 11.
The piston is provided with a valve housing 12, a valve seat 13 and a valve body 14, which is pushed onto the seat 13 by a spring 15. The components 12 to 15 form an upstream valve.
Orifices 16 are made in the foot valve housing 7, which orifices are provided at the top of a spring-loaded upstream valve 17.
An excitation chamber 18, which has a cylindrical section in which a beaker-shaped piston 19 is movable, is located below the housing 7. At the top, said beaker-shaped piston has a section which has an axial orifice 20. A valve body 21, which forms part of the damping valve, is placed on the top section of the beaker-shaped piston 19. The seat of the damping valve is located at the broadened underside of a tube section 9 screwed to the bottom of the central tube 10. The upper surface of the broadened section of said tube section 9 engages on the foot valve housing 7.
It w
REFERENCES:
patent: 5386893 (1995-02-01), Feigel
patent: 5400877 (1995-03-01), Kircher et al.
de Kock Cornelis
De Kock Paul
Koni B.V.
Young Lee W.
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