Embodiments of the present invention generally relate to a suspension damper assembly for a vehicle. More specifically, the invention relates to a compression isolator for use with a vehicle damper.
Vehicle suspension systems typically include a spring component or components and a dampening component or components. Typically, mechanical springs, like helical springs are used with some type of viscous fluid-based dampening mechanism and the two are mounted functionally in parallel.
Embodiments herein generally comprise a fluid chamber having a piston dividing the chamber into a compression and rebound sides, a reservoir in fluid communication with the compression side of the chamber, and an isolator disposed in a fluid flow path between the compression side and the reservoir, whereby the isolator obstructs fluid flow between the compression side and the reservoir. In one embodiment, a bypass provides a fluid path between the compression side and the isolator.
So that the manner in which the above recited features can be understood in detail, a more particular description may be had by reference to embodiments, some of which are illustrated in the appended drawings. It is to be noted, however, that the appended drawings illustrate only typical embodiments and are therefore not to be considered limiting of its scope, for the invention may admit to other equally effective embodiments.
In addition to the shimmed paths 49, 51 through the piston 202, fluid can travel between the compression 120 and rebound 125 sides of the chamber by utilizing an annular bypass 38 formed between the chamber 122 and an outer housing 123. While the bypass 38 utilizes an annular area and is co-axially disposed around the chamber 122 in the embodiment shown, it could comprise any number of designs so long as it provides an alternative fluid path between compression and rebound sides and around the piston 202. An internal bypass damper is shown and described in U.S. Pat. No. 6,296,092 which is entirely incorporated herein by reference. From the compression side 120 of the chamber, fluid may, in one embodiment, enter the bypass 38 through one of two ports 28, 30. On the rebound side, communication between the chamber and the bypass 38 is through port 24. The bypass 38 is a convenient way to provide “position sensitive” dampening. For example, on the compression side 120 of the chamber, the ports 28, 30 are axially spaced along the wall of the chamber. During a first portion of a compression stroke (shown in
At an end opposite the rod 19, the damper 200 includes a reservoir 110 for collecting fluid as the fluid capacity of the chamber decreases due to the volume of the encroaching piston rod 19 during a compression stroke. The reservoir 110 includes a floating piston 14 that acts to transfer pressure between damping fluid on one side and a gas pocket 18 on another side. As fluid enters the reservoir 110, the floating piston 14 moves (arrow 20) to compress the gas pocket and enlarge the volume of the reservoir 110 thereby compensating for the volume of the rod 19. In a rebound stroke of the piston 202, the reservoir returns fluid to the chamber 122 by operating in a reverse fashion (e.g. the pressurized gas pocket expands and damping fluid leaves the reservoir). A fill valve 15 permits access to the gas pocket, permitting the pressure in the pocket 18 to be adjusted based upon various conditions and preferences.
In one embodiment, the compression isolator 5 seals a far end of the chamber 122 between the compression side 120 and the floating piston 14 of the reservoir 110, and fluid communication between the chamber and the reservoir is limited to a fluid path 105 through aperture 100. As shaft 19 moves in a compression stroke, damping fluid from the compression side 120 is compressed against compression isolator 5 and thereby forced back through piston assembly shim 49 (along flow path 48) to rebound chamber 125. During such compression, additional fluid travels from chamber 120 to chamber 125 by exiting aperture 28 or 30, traveling in annular space 38 (along paths 150, 151) and entering chamber 125 via aperture 24 (along path 154). At the same time, fluid in chamber 125, that corresponds to the incurring volume of shaft 19, is displaced from chamber 125 and exits via aperture 24 (along path 155) into annular space 38 toward reservoir 110.
As the piston 202 continues its movement towards the end of the chamber (as shown in
Finally, as shown in
In one embodiment a simplified non-bypass type damper includes a compression isolator 5. In such embodiment (not shown) fluid travels, during a compression stroke, from the compression side of the piston to the rebound side of the piston only via flow such as along 48 through the piston. Fluid displaced by the incursion of rod 19 is pushed (along with pressure exerted due to compression of the compression side) toward the reservoir and floating piston. In such embodiment, the isolator 5 may have an aperture (in lieu of aperture 100 as shown in the Figures) or apertures located near or about a center of the isolator 5 and sized to allow normal damping flow but to restrict sudden large volume flow that may cause cavitation. It will be understood that the isolator can be used without a bypass by simply utilizing a metering device at an end of the chamber opposite the piston rod.
While the foregoing is directed to embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof. For example, the invention is shown in the embodiments as including a bypass that operates with the compression isolator. Similarly, the location and design of the reservoir is variable, as shown in the disclosed embodiments. Such variations are within the scope of the invention and the claims that follow.
This application is a continuation application of and claims the benefit of and claims priority to co-pending U.S. patent application Ser. No. 15/180,250, filed on Jun. 13, 2016, entitled “COMPRESSION ISOLATOR FOR A SUSPENSION DAMPER” by John Marking, assigned to the assignee of the present application, and is hereby incorporated by reference in its entirety. The U.S. patent application Ser. No. 15/180,250 is a continuation application of and claims the benefit of and claims priority to U.S. patent application Ser. No. 14/692,401, filed on Apr. 21, 2015, now U.S. Pat. No. 9,366,307, entitled “COMPRESSION ISOLATOR FOR A SUSPENSION DAMPER” by John Marking, assigned to the assignee of the present application, and is hereby incorporated by reference in its entirety. The U.S. patent application Ser. No. 14/692,401 is a continuation application of and claims the benefit of and claims priority to U.S. patent application Ser. No. 13/226,230, filed on Sep. 6, 2011, now U.S. Pat. No. 9,038,791, entitled “COMPRESSION ISOLATOR FOR A SUSPENSION DAMPER” by John Marking, assigned to the assignee of the present application, and is hereby incorporated by reference in its entirety. The U.S. patent application Ser. No. 13/226,230 claims the benefit of and claims priority to the U.S. Provisional Patent Application No. 61/380,177 filed on Sep. 3, 2010, entitled “COMPRESSION ISOLATOR FOR A SUSPENSION DAMPER” by John Marking, assigned to the assignee of the present application, and is hereby incorporated by reference in its entirety. The U.S. patent application Ser. No. 13/226,230 is also a continuation-in-part application of and claims the benefit of and claims priority to U.S. patent application Ser. No. 13/175,244, filed on Jul. 1, 2011, now U.S. Pat. No. 8,627,932, entitled “BYPASS FOR A SUSPENSION DAMPER” by John Marking, assigned to the assignee of the present application, and is hereby incorporated by reference in its entirety. The U.S. Pat. No. 8,627,932 claims the benefit of and claims priority to the U.S. Provisional Patent Application No. 61/361,127 filed on Jul. 2, 2010, entitled “BYPASS LOCK-OUT VALVE FOR A SUSPENSION DAMPER” by John Marking, assigned to the assignee of the present application, and is hereby incorporated by reference in its entirety. The U.S. patent application Ser. No. 13/226,230 is also a continuation-in-part application of and claims the benefit of and claims priority to U.S. patent application Ser. No. 13/010,697, filed on Jan. 20, 2011, now U.S. Pat. No. 8,857,580 entitled “REMOTELY OPERATED BYPASS FOR A SUSPENSION DAMPER” by John Marking, assigned to the assignee of the present application, and is hereby incorporated by reference in its entirety. The U.S. Pat. No. 8,857,580 claims the benefit of and claims priority to the U.S. Provisional Patent Application No. 61/296,826 filed on Jan. 20, 2010, entitled “BYPASS LOCK-OUT VALVE FOR A SUSPENSION DAMPER” by John Marking, assigned to the assignee of the present application, and is hereby incorporated by reference in its entirety. The U.S. patent application Ser. No. 13/226,230 is also a continuation-in-part application of and claims the benefit of and claims priority to U.S. patent application Ser. No. 12/684,072, filed on Jan. 7, 2010, now abandoned, entitled “REMOTELY OPERATED BYPASS FOR A SUSPENSION DAMPER” by John Marking, assigned to the assignee of the present application, and is hereby incorporated by reference in its entirety. The U.S. patent application Ser. No. 12/684,072 claims the benefit of and claims priority to the U.S. Provisional Patent Application No. 61/143,152 filed on Jan. 7, 2009, entitled “REMOTE BYPASS LOCK-OUT” by John Marking, assigned to the assignee of the present application, and is hereby incorporated by reference in its entirety.
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