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Vibration and Earthquake Isolation

Shock-absorber-with-a-hydro-mechanical-stop

Hinged door assembly

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Roofing tiles

OF THE DRAWINGS As can be seen in FIG. 1, a roofing tile 10 is made from a sheet of malleable ...

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Collapsible luggage carrier

I claim: 1. A collapsible luggage carrier comprising a handle having portions adjacent its lower ...

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OF PREFERRED EMBODIMENTS OF THE INVENTION FIGS. 1 to 4 show a first embodiment of the hand truck ...

Shock absorber with a hydro-mechanical stop

Details

Inventors: Mourray, Jack W.;
Assignee: Ford Motor Company (Dearborn, MI)
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:

A shock absorber (10) has a rebound stop assembly (22). The rebound stop assembly (22) rests upon a shoulder (30) fixed to a piston rod (16). The rebound stop assembly (22) includes an elastomeric ring (24) interposed between two collars (26 and 28) forming an annular chamber (74) therebetween. At the end of the rebound stroke of the piston rod (16), the rebound stop assembly (22) is axially compressed between the shoulder (30) of the piston rod (16) and the rod guide (18) until the elastomeric ring (24) deforms to abut the inner wall (64) of the working cylinder. As the elastomeric ring deforms, the annular chamber decreases in volume. A restrictive passage (71) allows a restrictive flow of fluid therefrom. An additional chamber (70) is formed which is in restrictive fluid communication through the passage (71) with a section (68) of a rebound chamber (20). Further compression of the stop assembly (22) decreases the volume of both chambers (70 and 74), and causes restrictive fluid flow out therefrom through the passage (71) into the section (68) of the rebound chamber (20). The compression of the elastomeric ring and the restrictive fluid flow provides additional damping at the end of the rebound stroke.

DETAILED DESCRIPTION In accordance with the invention, a shock absorber has a working cylinder with a piston slideably received therein attached to a piston rod which extends through a rod guide at one end of the cylinder.
A hydro-mechanical stop is coaxially mounted about the piston rod between the piston and the rod guide.
The hydro-mechanical stop includes a tubular resiliently flexible ring mounted about the piston rod.
The flexible ring has an outer annular wall having a diameter smaller than the diameter of the inner wall of the working cylinder.
The ring rests on a shoulder fixed to the piston rod such that at the end of a rebound stroke of the piston rod, the ring is axially compressed between the shoulder and the rod guide.
The ring is sufficiently flexible such that upon axial compression of a predetermined amount, the outer annular wall enlarges until it abuts the inner wall of the working cylinder to form with said cylinder and said rod guide a substantially closed hydraulic chamber.
Upon further compression of the flexible ring, hydraulic fluid is forced from the hydraulic chamber through a restrictive passage to provide additional damping.
Preferably, collars are mounted at opposite axial ends of the flexible ring.
It is desirable that each collar has an axial extending cylinder section with a central aperture therethrough large enough to receive the piston rod and to provide an annular space therebetween.
The cylindrical section has an outer wall with a diameter sized such that the cylindrical section is pressed fit within an axial end of the flexible ring.
In addition, each collar has a radially extending flange.
Each flange has an axially inner facing surface which abuts an axial end of the flexible ring.
The outer surface of one of the radially extending flanges has a plurality of circumferentially spaced protrusions which are abuttable with the rod guide.
The outer surface of the other radially extending flange has a plurality of protrusions which abut the shoulder fixed to the piston rod

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