WO2005108131B1

WO2005108131B1 - Hydraulic damper comprising a hydraulic compression shut-off means

Info

Publication number: WO2005108131B1
Application number: PCT/ES2005/000232
Authority: WO
Inventors: Artazcoz Jose Angel Recalde
Original assignee: Ap Amortiguadores S A; Artazcoz Jose Angel Recalde
Priority date: 2004-05-04
Filing date: 2005-04-29
Publication date: 2006-01-05
Also published as: WO2005108131A1; ES2251293B1; ES2251293A1

Abstract

The invention relates to a damper comprising a hydraulic shut-off valve (10) which is disposed inside a distributor (11) such that a coil (13) can be used to control and regulate the passage of fluid from the compression chamber to the auxiliary chamber (9) which is defined between two co-axial tubular bodies (1 and 2) that form part of the damper assembly. According to the invention, the activation of the coil (13) causes the axial movement of the valve (10) such that, in the activated position, the fluid passes from the compression chamber (6) to the auxiliary chamber (9) through opposing grooves in the valve and the distributor. Alternatively, when the coil is in the deactivated position, the flow of fluid is almost completely stopped.

Claims

MODIFIED CLAIMS [received by the International Office on November 21, 2005 (21.11.05); Claims 1 to 8 replaced (3 pages)]

1.- HYDRAULIC SHOCK ABSORBER WITH HYDRAULIC BLOCKING IN COMPRESSION, being of the type that comprises two coaxial tubular bodies, exterior (1) and interior (2), between which a compensation chamber (9) is formed, containing this and the tubular body inside (2) a fluid and a piston (3) with its actuator rod (4), the piston (3) defining two chambers: one of traction (5) and another of compression (6), the passage of fluid being carried out in the relative movements between the wheel and the chassis of the vehicle where the shock absorber is mounted, from one to another chamber, through calibrated holes and valves provided in the piston (3), existing between the inner tubular body (2) and the chamber of compensation (9) a hydraulic blocking valve (10) that allows the hydraulic blocking of the path of the wheel when it approaches the chassis of the vehicle, characterized in that the hydraulic blocking valve (10) has a structure in the shape of a cazolet ay is fitted within a fixed tubular distributor (11) closing one end of the inner tubular body (2) of the shock absorber, and said hydraulic blocking valve (10) is associated with an electrical coil (13) to control and limit the passage of the fluid from the compression chamber (6) to the compensation chamber (9); all this in order that in the activated position of the coil a flow of fluid is allowed to pass to the compensation chamber (9), while in the rest position that flow of fluid is the minimum due to the adjustment with clearance of the distributor (11) and the hydraulic lock valve (10), thus significantly reducing the speed that the drive rod (4) is inserted in the damper.

2.- HYDRAULIC SHOCK ABSORBER WITH HYDRAULIC BLOCKING IN COMPRESSION, according to claim 1, characterized in that the side wall of the hydraulic blocking valve (10) has calibrated front grooves (17) and other rear grooves also calibrated (18) that in the active position of the electric coil (13) are faced with other slots (19) of the valve (10) for the passage of fluid to the compensation chamber (9), which also runs through the anterior slots (17), while in the rest position the slots (19) of the valve (10) will be facing a closed surface of the side wall of the distributor (11).

3.- HYDRAULIC SHOCK ABSORBER WITH HYDRAULIC BLOCKING IN COMPRESSION, according to any of the previous claims, characterized in that the valve (10) includes notches (20) on its free edge abutting against a front stepped surface (16) of the distributor ( 11) in the rest position of the coil (13), by the action of a spring (12) located between the bottom of the valve (10) and the coil (13) with interposition of a non-magnetic washer (14); all this in order that in this resting position there is a small flow of fluid towards the compensation chamber (9) that runs through those notches (20) and previous grooves (17) of the distributor (11).

4.- HYDRAULIC SHOCK ABSORBER WITH HYDRAULIC BLOCKING IN COMPRESSION, according to any one of the preceding claims, characterized in that the bottom of the valve (10) includes at least one small through hole (15).

5.- HYDRAULIC SHOCK ABSORBER WITH HYDRAULIC BLOCKING IN COMPRESSION, according to claim 3, characterized in that a portion of the spring (12) is housed within a central recess of the spool (13), while another end portion of the spring (12) fits around a central pin of the bottom of the valve (10).

6.- HYDRAULIC SHOCK ABSORBER WITH HYDRAULIC BLOCKING IN COMPRESSION, according to any of the previous claims, characterized in that the coil (13) is embedded inside the outer tubular body (1) closing one end thereof in correspondence with the distributor (11) which closes another even end of the inner tubular body (2) of the shock absorber.

7.- HYDRAULIC SHOCK ABSORBER WITH HYDRAULIC BLOCKING IN COMPRESSION, according to any of the preceding claims, characterized in that it includes a bushing (24) arranged concentrically with respect to the tubular bodies exterior (1) and interior (2) while being located at the end of the inner body (2) being fixed by means of interference to the inner tube (2) and the distributor (11), said bushing (24) including axial passages (25) to allow the passage of the fluid.

8.- HYDRAULIC SHOCK ABSORBER WITH HYDRAULIC BLOCKING IN COMPRESSION, according to any one of the preceding claims, characterized in that it includes a gasket (23) interposed between the distributor (11) and the coil (13).