End member assembly and gas spring assembly including the same

Abstract

The end member assembly includes a first end member section and a second end member section. The first end member section includes a first section wall having a mounting wall portion, a first outer side wall portion, and a first inner side wall portion. The mounting wall portion receives a flexible spring member. The first outer sidewall portion extends axially toward the first outer distal edge. A channel extends through the first inner sidewall portion in fluid communication between the first end member chamber and the second end member chamber. The second end member section includes a second section wall. The first end member section and the second end member section are connected to each other at a joint that forms a substantially fluid-tight seal between the first end member section and the second end member section. The joint is disposed in an axially spaced relationship from the flexible spring member in a fully compressed height of the flexible spring member. A gas spring assembly and a suspension system are further included.

Description

Background Art

[0001] The subject matter of the present disclosure relates broadly to the art of gas spring devices, and more particularly to end member assemblies constructed from a plurality of polymer end member segments that are attached to one another using integrally formed features. In an assembled state, such end member assemblies include a smooth and continuous outer surface, wherein exposed interfaces or joints between the end member segments are positioned toward a distal end of the end member assembly. A gas spring assembly including such an end member assembly has a flexible sleeve that is displaced along the smooth and continuous outer surface in an axially spaced relationship to the exposed joints. A suspension system may include one or more of such gas spring assemblies.

[0002] The subject matter of the present disclosure may be particularly applicable and used in conjunction with wheeled vehicles and will be shown and described herein with reference thereto. However, it should be understood that the subject matter of the present disclosure may also be used in other applications and environments, and the specific uses shown and described herein are merely exemplary. For example, the subject matter of the present disclosure may be used in conjunction with gas spring assemblies, support structures, height conditioning systems, and actuators for such wheelless vehicles associated with industrial machinery, components thereof, and / or other devices. Therefore, the subject matter of the present disclosure is not intended to be limited to uses associated with gas spring suspension systems for wheeled vehicles.

[0003] Most types and kinds of wheeled motor vehicles include a sprung mass (such as, for example, a vehicle body or chassis) and an unsprung mass (such as, for example, two or more axles or other wheel-engaging members between which a suspension system is disposed). Typically, the suspension system will include a plurality of spring devices and a plurality of damping devices that together enable the sprung and unsprung masses of the vehicle to move relative to each other in a somewhat controlled manner. Movement of the sprung and unsprung masses toward each other is generally referred to in the art as pitch motion, while movement of the sprung and unsprung masses away from each other is generally referred to in the art as rebound motion.

[0004] In many applications involving vehicle suspension systems, it is desirable to utilize spring elements with the lowest possible spring rate, as using a lower spring rate element can provide improved ride quality and comfort compared to spring elements with higher spring rates. That is, it is well understood in the art that the use of spring elements with higher spring rates (i.e., stiffer springs) transfers a greater magnitude of road input to the sprung mass of the vehicle, often resulting in a bumpier and less comfortable ride. Conversely, the use of spring elements with lower spring rates (i.e., softer and more compliant springs) transfers a smaller magnitude of road input to the sprung mass and, therefore, provides a more comfortable ride.

[0005] In some cases, the spring device may take the form of a gas spring assembly that utilizes compressed gas as the working medium. Gas spring assemblies of various types, kinds, and configurations are well known and commonly used. A typical gas spring assembly may include a flexible wall secured between relatively rigid end members and / or end member assemblies. In such cases, the spring rate of the gas spring assembly may typically be reduced by increasing the volume of compressed gas operatively associated with the gas spring assembly, thereby improving ride comfort. This is typically accomplished by placing an additional chamber, cavity, or volume containing the compressed gas in fluid communication with the main spring chamber of the gas spring assembly. In some cases, the additional volume may be formed within one of the end members of the gas spring assembly.

[0006] In some cases, two or more polymer end member parts can be permanently fixed together to form an end member assembly. In many cases, such a configuration will include a fluid-tight chamber within the end member assembly. However, the known configuration of such an end member assembly generally does not expect to include an exposed interface or joint between adjacent components, which is toward the end to which the associated flexible sleeve is connected. Therefore, in such a configuration, the exposed interface or joint is not expected to be located in the axial region or zone of the end member assembly, and the associated flexible sleeve regularly (i.e., almost constantly) contacts or engages adjacently with the axial region or zone during normal use in the operation of the gas spring assembly. In the case where such an exposed interface or joint has an unfinished edge or protrudes along the outer surface, the flexible sleeve may deteriorate by moving along such an exposed interface or joint and contacting it. In order to help ensure that the edge of the exposed interface or joint is finished and smooth, additional manufacturing and assembly steps and / or processes may be used, which may adversely increase factors such as production time, tool and equipment costs, and post-assembly operations.

[0007] German Patent Publication No. DE102007035640 discloses a two-piece piston assembly for a gas spring assembly. The lower cup-shaped section includes an outer sidewall. The upper cover section includes a mounting wall for receiving the end of a flexible sleeve. The upper cover section is secured to the lower cup-shaped section at the distal end of the outer sidewall via a gas-tight joint disposed adjacent to the mounting wall. The gas-tight joint is located below the flexible sleeve and contacts the flexible sleeve during normal use.

[0008] European Patent No. 1,862,335 discloses a two-piece piston assembly for use in a gas spring assembly. This embodiment includes a lower cup-shaped portion having an outer sidewall. An upper annular cover includes a mounting wall sized to receive the end of a flexible sleeve. The upper cover is secured to the outer sidewall of the lower cup-shaped portion by a welded joint positioned adjacent the mounting wall, which will lie beneath and contact the flexible sleeve during normal use.

[0009] European Patent No. 2723588 discloses various embodiments of a two-piece piston assembly for use in a gas spring assembly. These embodiments include a lower portion having an outer sidewall. An annular cover has a wall for receiving the end of a flexible sleeve. The annular cover is attached to the distal end of the outer sidewall of the lower portion by a butt weld joint that forms a gas-tight seal between the parts. The joint is positioned adjacent to the wall receiving the end of the flexible sleeve, such that during normal use, the joint lies beneath and in contact with the flexible sleeve.

[0010] U.S. Patent No. 9,334,916 discloses a gas spring assembly having a two-piece piston assembly. The upper cover portion includes a wall to which a flexible sleeve is secured. The lower base portion has a pot-shaped configuration with an axially extending outer sidewall. The upper cover portion is attached to the lower base portion at a butt-weld connection provided at the upper end of the piston assembly. During normal use of the gas spring assembly, the butt-weld connection is disposed below and in contact with the flexible sleeve.

[0011] Despite the wide use and overall success of the various end member configurations known in the art, it is believed that there is a need to develop end member assemblies that avoid or otherwise overcome the aforementioned and / or other disadvantages of known configurations, and / or otherwise advance the art of gas spring devices, while still maintaining comparable or even improved factors such as performance, ease of manufacture, ease of assembly, ease of installation, and / or manufacturing cost. Summary of the Invention

[0012] One example of an end member assembly according to the subject matter of the present disclosure may have a longitudinal axis and may be sized to receive and engage an associated flexible spring member to form an associated gas spring assembly. The end member assembly may include a first end member segment and a second end member segment. The first end member segment may include a first segment wall extending circumferentially about the longitudinal axis. The first segment wall may include a first end wall portion oriented transversely to the longitudinal axis. The first segment wall may also include a mounting wall portion extending along the first end wall portion in a first axial direction. The mounting wall portion may be sized to sealingly engage the associated flexible spring member. The first segment wall may also include a first outer sidewall portion and a first inner sidewall portion. The first outer sidewall portion may extend along the first end wall portion in a second axial direction opposite the first axial direction toward a first outer distal edge, the first outer distal edge being axially offset from the first end wall portion by a first outer sidewall distance. The first outer sidewall portion may be disposed radially outward of the mounting wall portion and may at least partially define a first end member chamber. The first inner sidewall portion may be disposed radially inward of the first outer sidewall portion and may extend along the first end wall portion toward a first inner distal edge, the first inner distal edge being axially offset from the first end wall portion by a first inner sidewall distance that is less than the first outer sidewall distance of the first outer sidewall portion, such that a recess extends along the first outer distal edge into the first end member segment. The recess may have a frustoconical or concave shape that protrudes between the first inner distal edge and the first outer distal edge. The second end member segment may include a second segment wall that extends circumferentially about the longitudinal axis. The second segment wall may include a second end wall portion oriented transverse to the longitudinal axis. The second end wall portion may include an outer peripheral edge. The second inner sidewall portion may extend along the second end wall portion in a first axial direction toward a second inner distal edge, the second inner distal edge being axially offset from the second end wall portion by a second inner sidewall distance, such that the second end member has a frustoconical or convex shape that protrudes between the second inner distal edge and the outer peripheral edge of the second end wall portion. The second end member segment is at least partially receivable within the recessed portion of the first end member segment such that the first inner distal edge and the second inner distal edge are disposed adjacent one another. The first end member segment and the second end member segment are connected to one another along a first flow material joint formed between the first outer distal edge and the outer peripheral edge such that a substantially fluid-tight seal is formed between the first outer distal edge and the outer peripheral edge.

[0013] Another example of an end member assembly according to the subject matter of the present disclosure may have a longitudinal axis and may be sized to receptively engage an associated flexible spring member to form an associated gas spring assembly. The end member assembly may include a first end member segment and a second end member segment. The first end member segment may include a first segment wall extending circumferentially about the longitudinal axis. The first segment wall may include first and second end wall portions, a mounting wall portion, a first outer sidewall portion, and first and second inner sidewall portions. The first end wall portion may be oriented transverse to the longitudinal axis. The mounting wall portion may extend along the first end wall portion in a first axial direction and may be sized to sealingly engage the associated flexible spring member. The first outer sidewall portion may be disposed radially outward from the mounting wall portion. The first outer sidewall portion may include a first outer surface portion and a first inner surface portion. The first outer sidewall portion may extend in a second axial direction, opposite the first axial direction, toward a first outer distal edge. The first inner sidewall portion may be disposed radially inward from the first outer sidewall portion. The first inner sidewall portion may include a second outer surface portion and a second inner surface portion. The second outer surface may be arranged to face the first inner surface portion so that the first end member chamber is at least partially defined between the second outer surface portion and the first inner surface portion. The second inner surface portion may at least partially define a second end member chamber, which is arranged radially inward of at least a portion of the first end member chamber. The second inner wall portion may extend in a first axial direction along one of the first end wall portion and the first inner wall portion so that the second inner wall portion and the mounting wall portion are axially coextensive. The second end wall portion may be oriented transversely to the longitudinal axis and may extend across the second inner wall portion in an axially offset relationship with the first end wall portion. At least one channel may extend through the second end wall portion and be in fluid communication with the second end member chamber. The second end member segment may include a second segment wall extending circumferentially around the longitudinal axis. The second segment wall may include a third end wall portion oriented transversely to the longitudinal axis. The third end wall portion may include an outer peripheral edge. The first end member segment and the second end member segment can be connected to each other by a flow material joint formed between the first outer distal edge and the outer peripheral edge so as to form a substantially fluid-tight seal between the first outer distal edge and the outer peripheral edge. The flow material joint can be positioned toward an end of the end member assembly opposite the first end wall portion so that the flow material joint is offset from the associated flexible spring member in a second axial direction at an associated fully compressed height of the associated gas spring assembly.

[0014] One example of a gas spring assembly according to the subject matter of the present disclosure may include a flexible spring member having a longitudinal axis. The flexible spring member may include a flexible wall extending circumferentially about the longitudinal axis between a first end and a second end of the flexible spring member to at least partially define a spring chamber between the first end and the second end of the flexible spring member. An end member may be secured across the first end of the flexible spring member such that a substantially fluid-tight connection is formed between the end member and the first end of the flexible spring member. An end member assembly according to either of the preceding two paragraphs may be secured across the second end of the flexible spring member such that a substantially fluid-tight connection is formed between the end member assembly and the second end of the flexible spring member.

[0015] One example of a gas spring assembly according to the disclosed subject matter may have a fully compressed height and may include a flexible spring member having a longitudinal axis. The flexible spring member may include a flexible wall extending circumferentially about the longitudinal axis between a first end and a second end of the flexible spring member to at least partially define a spring chamber between the first and second ends of the flexible spring member. An end member may be secured across the first end of the flexible spring member to form a substantially fluid-tight connection between the end member and the first end of the flexible spring member. An end member assembly may be secured across the second end of the flexible spring member to form a substantially fluid-tight connection between the end member assembly and the second end of the flexible spring member. The end member assembly may include a first end member segment and a second end member segment. The first end member segment may include a first segment wall extending circumferentially about the longitudinal axis. The first segment wall may include first and second end wall portions, a mounting wall portion, a first outer sidewall portion, and first and second inner sidewall portions. The first end wall portion may be oriented transverse to the longitudinal axis. The mounting wall portion may extend in a first axial direction along the first end wall portion. The mounting wall portion may be sized to sealingly engage the flexible spring member. The first outer sidewall portion may be disposed radially outward from the mounting wall portion. The first outer sidewall portion may include a first outer surface portion and a first inner surface portion. The first outer sidewall portion may extend in a second axial direction toward the first outer distal edge. The first inner sidewall portion may be disposed radially inward from the first outer sidewall portion. The first inner sidewall portion may include a second outer surface portion and a second inner surface portion. The second outer surface portion may be disposed in a facing relationship with the first inner sidewall portion, such that the first end member chamber is at least partially defined between the second outer surface portion and the first inner sidewall portion. The second inner sidewall portion may at least partially define a second end member chamber, which is disposed radially inward from at least a portion of the first end member chamber. The second inner sidewall portion may extend in the first axial direction along one of the first end wall portion and the first inner sidewall portion, such that the second inner sidewall portion is axially coextensive with the mounting wall portion. The second inner sidewall portion may be disposed radially inward from the mounting wall portion, such that an annular gap is formed between the second inner sidewall portion and the mounting wall portion. The annular gap may extend axially between the first end wall portion and the open end opposite the first end wall portion. The second end wall portion may be oriented transverse to the longitudinal axis and may extend across the second inner sidewall portion in an axially offset relationship with the first end wall portion. A first passage may extend through the first end wall portion, fluidly communicating between the annular gap and the first end member chamber. A second passage may extend through the second end wall portion, fluidly communicating with the second end member chamber. The second end member segment may include a second segment wall extending circumferentially around the longitudinal axis. The second segment wall may include a third end wall portion oriented transverse to the longitudinal axis. The third end wall portion may extend radially outward to an outer peripheral edge.The first and second end member segments may be connected to each other by a flow material joint formed between the first outer distal edge and the outer peripheral edge such that a substantially fluid-tight seal is formed between the first outer distal edge and the outer peripheral edge. The flow material joint may be disposed in axially spaced relation to the flexible spring member at a fully compressed height of the gas spring assembly.

[0016] One example of a suspension system according to the presently disclosed subject matter may include a compressed gas system comprising a compressed gas source and a control device in fluid communication with the compressed gas source. At least one gas spring assembly according to either of the preceding two paragraphs may be arranged in fluid communication with the compressed gas source via the control device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of one example of a suspension system of an associated vehicle including a gas spring assembly according to the presently disclosed subject matter.

[0018] Figure 2 is a side elevation view of one example of a gas spring assembly including one example of an end member assembly according to the presently disclosed subject matter.

[0019] Figure 3 It is along Figure 2 The line 3-3 in the Figure 2 A partial cross-sectional side view of a gas spring assembly in FIG, and indicating the design height and fully compressed height of the gas spring assembly.

[0020] Figure 4 yes Figure 2 and Figure 3 A top perspective view of the end member assembly in FIG.

[0021] Figure 5 yes Figures 2 to 4 Top plan view of the end member assembly in FIG.

[0022] Figure 6 It is along Figure 5 The line 6-6 in the Figures 2 to 5 Cross-sectional side view of the end member assembly.

[0023] Figure 7 is shown before assembly Figures 2 to 6 A side elevation view of components of the end member assembly. DETAILED DESCRIPTION

[0024] Turning now to the drawings, it should be understood that the illustrations are for the purpose of illustrating examples of the disclosed subject matter and are not intended to be limiting. In addition, it should be understood that the drawings are not drawn to scale and that parts of specific features and / or elements may be exaggerated for the purpose of clarity and / or ease of understanding.

[0025] Figure 1 An example of a suspension system 100 is illustrated, arranged between a sprung mass (such as, for example, an associated vehicle body BDY) and an unsprung mass (such as, for example, associated wheels WHL, associated suspension components SPC, and / or associated axles AXL of an associated vehicle VHC). It should be understood that any one or more of the components of the suspension system may be operatively connected between the sprung and unsprung masses of the associated vehicle in any suitable manner. Furthermore, it should be understood that such a suspension system for a vehicle may also optionally include, for example, a plurality of damping members (such as dampers DMP), and any such damping members may also be operatively connected between the sprung and unsprung masses of the associated vehicle in any suitable manner.

[0026] The suspension system may also include a plurality of gas spring assemblies supported between the sprung and unsprung masses of an associated vehicle. Figure 1 In the illustrated arrangement, the suspension system 100 includes four gas spring assemblies 102, with one gas spring assembly positioned toward each corner of the associated vehicle adjacent a corresponding wheel WHL. However, it should be understood that any other suitable number of gas spring assemblies may alternatively be used in any other configuration or arrangement. Figure 1 As shown, the gas spring assembly 102 is supported between the body BDY and the suspension component SPC and / or the axle AXL of the associated vehicle VHC. Figure 1 The gas spring assembly shown and described (eg, gas spring assembly 102) is illustrated as having a rolling lobe configuration. However, it should be understood that other types, kinds, and / or configurations of gas spring assemblies may alternatively be used.

[0027] The suspension system 100 also includes a compressed gas system 104 operatively associated with the gas spring assembly for selectively providing compressed gas (e.g., air) thereto and selectively transferring compressed gas therefrom. Figure 1 In the exemplary embodiment shown, the compressed gas system 104 includes a compressed gas source, such as a compressor 106, for example, for producing compressed air or other gases. A control device, such as a valve assembly 108, is shown as being in communication with the compressor 106 and can be of any suitable configuration or arrangement. In the exemplary embodiment shown, the valve assembly 108 includes a valve block 110 having a plurality of valves 112 supported thereon. The valve assembly 108 may also optionally include a suitable exhaust device, such as a muffler 114, for example, for exhausting compressed gas from the system. Optionally, the compressed gas system 104 may also include a reservoir 116 in fluid communication with the compressor and / or the valve assembly 108 and suitable for storing compressed gas.

[0028] The valve assembly 108 communicates with the gas spring assembly 102 via a suitable gas delivery line 118. Thus, compressed gas can be selectively delivered into and / or out of the gas spring assembly via the valve assembly 108 by selectively operating the valve 112, thereby changing or maintaining the height of the vehicle, for example, at one or more corners of the vehicle.

[0029] The suspension system 100 may also include a control system 120 that can communicate with any one or more systems and / or components of the vehicle VHC and / or suspension system 100, such as for selectively operating and / or controlling these systems and / or components. The control system 120 may include a controller or electronic control unit (ECU) 122 that is communicatively coupled to the compressor 106 and / or valve assembly 108, such as via conductors or leads 124, for selectively operating and controlling the compressor and / or valve assembly. This selective operation and / or control may include providing compressed gas to the gas spring assembly 102 and exhausting compressed gas from the gas spring assembly. The controller 122 may be of any suitable type, kind, and / or configuration.

[0030] The control system 120 may also optionally include one or more height (or distance) sensing devices 126, such as, for example, may be operatively associated with the gas spring assembly and capable of outputting or otherwise generating data, signals, and / or other communications related to the height of the gas spring assembly or the distance between other components of the vehicle. Such height sensing devices may communicate with the ECU 122, which may receive the height or distance signals from the height sensing devices. The height sensing devices may communicate with the ECU 122 in any suitable manner, such as, for example, via conductors or leads 128. Furthermore, it should be understood that the height sensing devices may be of any suitable type, kind, and / or configuration.

[0031] One example of a gas spring assembly 200 according to the disclosed subject matter is Figure 2 and Figure 3 is shown as having a longitudinally extending axis AX ( Figure 3 ), and may include one or more end members, such as end member 202 and end member 204 longitudinally spaced from end member 202 (which may also be referred to herein as an end member assembly). Flexible spring member 206 may extend circumferentially about axis AX and may be secured between the end members in a substantially fluid-tight manner such that spring chamber 208 ( Figure 3 ) is at least partially defined between the end members.

[0032] The gas spring assembly 200 may be disposed between an associated sprung mass and an unsprung mass of an associated vehicle in any suitable manner such that a substantially fluid-tight connection is formed between the sprung mass and the unsprung mass. For example, one end member may be operatively connected to the associated sprung mass, while the other end member may be disposed toward and operatively connected to the associated unsprung mass. Figure 2 and Figure 3 In the embodiment shown, for example, the end member 202 is arranged along a first structural member or upper structural member USC (such as, Figure 1 The end member 202 may be secured to an associated vehicle body (BDY) in the upper structural component USC, for example, and may be secured to the component in any suitable manner. For example, one or more securing devices, such as, for example, mounting studs 210, may be included along the end member 202. In some cases, one or more securing devices (e.g., mounting studs 210) may protrude outwardly from the end member 202 and may be secured to the end member in a suitable manner, such as, for example, by means of a flow material joint (not shown) or a press-fit connection (not shown). In addition, such one or more securing devices may extend through a mounting hole HLS in the upper structural component USC and may receive, for example, one or more threaded nuts 212 or other securing devices. As an alternative to one or more mounting studs 210, one or more threaded channels (e.g., blind channels and / or through channels) may be used in combination with a corresponding number of one or more threaded fasteners.

[0033] Additionally, fluid communication ports such as, for example, transfer channel 214 ( Figure 3 ) to permit fluid communication with the spring chamber 208, such as, for example, for transferring compressed gas into and / or out of the spring chamber. In the exemplary embodiment shown, the transfer passage 214 extends through at least one of the mounting studs 210 and is in fluid communication with the spring chamber 208. However, it should be understood that any other suitable fluid communication arrangement may alternatively be used.

[0034] The end member assembly 204 may be arranged in any suitable manner along a second structural component or lower structural component LSC (such as Figure 1 The end member assembly 204 may be secured to a suspension component SPC or axle AXL in the lower structural component. As an example, the lower structural component LSC may include one or more mounting holes HLS extending therethrough. In such cases, a securing device 216 operatively connected or operatively connectable to the end member assembly 204 may extend through the mounting holes HLS to secure the end member assembly (or one or more components thereof) to or along the lower structural component.

[0035] It will be appreciated that the one or more end members may be of any suitable type, kind, construction and / or configuration and may be operatively connected to or otherwise secured to the flexible wall in any suitable manner. Figure 2 and Figure 3 In the exemplary arrangement shown, the end member 202 is of the type commonly referred to as a bead plate and is secured to the first end 218 of the flexible spring member 206 using a crimped edge connector 220. Figure 2 and Figure 3 In the exemplary arrangement of FIG, the end member assembly 204 is shown as a type commonly referred to as a piston (or roll-off piston) having an outer surface 222 that abuts against the flexible spring member 206 such that a rolling lobe 224 is formed along the outer surface. In a preferred arrangement, the outer surface 222 is smooth and continuous along at least a portion of the end member assembly 204 such that the rolling lobe 224 is axially displaced along the outer surface 222 in an otherwise conventional manner as the gas spring assembly 200 is displaced between the extended and collapsed conditions.

[0036] refer to Figure 3 In some cases, a height or distance sensing device 226 may be optionally disposed within the spring chamber 208, such as by being secured along the end member 202 using suitable fasteners 228. The height sensing device 226 may be of any suitable type, kind, and / or configuration, such as, for example, an ultrasonic sensor that transmits and receives ultrasonic waves (WVS). Additionally, it should be understood that the height sensing device 226 may be connected to other systems and / or components of the vehicle suspension system in any suitable manner. Figure 3 As shown, for example, the height sensing device 226 includes leads or connections 230 that can be used for such communication purposes, such as by, for example Figure 1 As indicated by lead 128 of the height sensing device 126 of the control system 120.

[0037] The end member assembly according to the subject matter of the present disclosure is formed by a plurality of end member parts or segments that are attached to each other so that a substantially fluid-tight connection is formed between these parts or segments. In some cases, the end member according to the subject matter of the present disclosure may at least partially define one or more end member chambers. Additionally or alternatively, in some cases, the plurality of end member parts or segments of the end member assembly according to the subject matter of the present disclosure may be attached to each other by attachment joints that are exposed externally on or along the outer side surface of the end member assembly. In some cases, the end member assembly may include an area or zone along which the rolling cam of the associated flexible spring member of the associated gas spring assembly is typically displaced during conventional use in operation. In such cases, the externally exposed attachment joint is preferably positioned in a relationship axially spaced apart from any such area or zone (i.e., outside of any such area or zone or otherwise axially away from any such area or zone). That is, an end member assembly according to the presently disclosed subject matter may optionally include a smooth and continuous outer surface portion on or along which the rolling lobes may travel during normal use in operation, wherein the attachment joint is axially spaced from such an area or zone (i.e., outside of the area or zone) such that the attachment joint remains externally exposed and otherwise not covered by the flexible spring member and its rolling lobes during normal use in operation. Additionally, or as another alternative, an end member assembly according to the presently disclosed subject matter may optionally include a first inner wall portion and a second inner wall portion that at least partially form an inner column operable to transmit axial forces and / or loads through the end member assembly. In some cases, the presently disclosed subject matter configuration may allow for modularity in that one end member segment may be adapted for use in conjunction with a variety of other end member segments, such as having different sidewall profiles or shapes (e.g., to allow for adjustment of spring rate), different axial heights (e.g., to provide axial travel or other performance characteristics), or any combination thereof.

[0038] One example of a suitable configuration for an end member assembly according to the presently disclosed subject matter is Figures 2 to 623. The end member assembly 204 is shown as an end member assembly 204. The end member assembly can extend along a first or upper end 232 toward a second or lower end 234 longitudinally spaced from the end member 232. The end member assembly 204 can include an end member component or segment 236 disposed toward the end 232 of the end member assembly and an end member component or segment 238 disposed toward the end 234 of the end member assembly and operatively connected to the end member segment 236. It should be understood that in some configurations, one or more features of either the end member segment 236 or the end member segment 238 can optionally be included on or along the other of the end member segment 236 or the end member segment 238 without departing from the subject matter of the present disclosure. Therefore, it should be recognized and understood that the specific configurations shown and described herein are merely exemplary and not limiting.

[0039] In some applications and / or conditions of use, the end member segment 236 can take the form of a first segment or upper segment of an end member assembly and, therefore, can include one or more features suitable for operatively engaging the end of the flexible spring member 206. For example, the end member segment 236 can include a segment wall 240 extending circumferentially about the axis AX. The segment wall 240 can include an end wall portion 242 oriented transverse to the axis AX. A mounting wall portion 244 can extend circumferentially about the axis AX and extend axially along the end wall portion 242 toward a distal edge 246. The mounting wall portion 244 can include an inner surface portion 248. The mounting wall portion 244 can also include an outer surface portion 250 that can be sized to receive an end 252 of the flexible spring member 206 and form a substantially fluid-tight seal therewith. In some cases, an annular ridge or one or more protrusions 254 may extend radially outward beyond outer surface portion 250 , such as may be used to engage or at least partially retain end 252 of flexible spring member 206 on or along mounting wall portion 244 .

[0040] The segment wall 240 of the end member segment 236 may further include an outer sidewall portion 256 that extends circumferentially about the axis AX and extends axially along the end wall portion 242 in a direction generally opposite the distal edge 246 of the mounting wall portion 244. The outer sidewall portion 256 is disposed radially outward from the mounting wall portion 244 and transitions to the end wall portion 242 at a shoulder wall portion 258. The outer sidewall portion 256 may extend along the shoulder wall portion 258 toward a distal surface or edge 260 that extends annularly about the axis AX. The outer sidewall portion 256 may include an outer surface portion 262 and an inner surface portion 264. The segment wall 240 of the end member segment 236 may further include an inner sidewall portion 266 that extends circumferentially about the axis AX. The inner sidewall portion 266 extends along the end wall portion 242 and / or along the mounting wall portion 244 toward a distal edge 268. In some cases, the inner sidewall portion 266 may have an overall shape or configuration that is approximately cylindrical. In other cases, the inner wall portion may have a cross-sectional shape or profile that is curved and / or oriented at an acute angle relative to the longitudinal axis AX. In such cases, the inner wall portion may have an overall shape or configuration that is approximately concave, convex, or truncated conical. The inner wall portion 266 is disposed radially inwardly of the outer wall portion 256. The inner wall portion 266 may include an outer surface portion 270 facing the inner surface portion 264 so that the end member chamber 272 is at least partially defined between the inner surface portion and the outer surface portion. The inner wall portion 266 may also include an inner surface portion 274 facing opposite to the outer surface portion 270, wherein the end member chamber 276 is at least partially defined radially inwardly of at least a portion of the end member chamber 272.

[0041] The segment wall 240 of the end member segment 236 may also include an inner sidewall portion 278 that extends along the end wall portion 242 and / or along the inner sidewall portion 266 in a generally axial direction opposite or otherwise away from the end wall portion 242 and / or along the inner sidewall portion 266. In some cases, the inner sidewall portion 278 may be coextensive with the mounting wall portion 244. In such cases, the inner sidewall portion 278 may be spaced radially inward of the mounting wall portion 244. Thus, the inner sidewall portion 278 may include an outer side surface portion 280 that, together with the inner surface portion 248, may at least partially define an annular gap or groove 282 between the mounting wall portion 244 and the inner sidewall portion 278. The annular groove 282 may extend axially from the open end 284 toward the end wall portion 242 and / or the inner sidewall portion 266. In some cases, one or more openings or passages 286 can extend through end wall portion 242 in fluid communication with end member chamber 272. In some cases, passages 286 can be in fluid communication with annular groove 282, such that spring chamber 208 can be provided in fluid communication with end member chamber 272 via passages 286 and annular groove 282. In a preferred arrangement, a plurality of passages 286 are provided in circumferentially spaced relationship to one another about axis AX.

[0042] The segment wall 240 of the end member segment 236 may also include an end wall portion 288 oriented transverse to the longitudinal axis AX. The end wall portion 288 may extend across the inner sidewall portion 278 to form a closed end of the end member segment, and therefore, the closed end of the end member assembly 204. In such an arrangement, during some conditions of use, the end wall portion 288 may contact the jounce bumper 290 or other internal device. For example, axial loads and / or forces generated along the end wall portion 288 (such as from the jounce bumper 290) may be transmitted through the inner sidewall portion 278 into the inner sidewall portion 266 for transmission into the end member segment 238. In some cases, one or more openings or channels 292 may extend through the end wall portion 288 in fluid communication with the end member chamber 276. In such cases, the spring chamber 208 may be in fluid communication with the end member chamber 276 via the channels 292. In a preferred arrangement, a plurality of channels 292 are disposed in circumferentially spaced relation to one another about the axis AX.

[0043] In some cases, a plurality of connecting wall portions or ribs 294 may extend between the outer sidewall portion 256 and the inner sidewall portion 266 and operatively interconnect the outer sidewall portion and the inner sidewall portion. If included, the connecting wall portion 294 may be disposed along the end wall portion 242 and operatively connected to the end wall portion. Additionally or alternatively, the connecting wall portion 294 (if included) may extend axially from the adjacent end wall portion 242 or otherwise along the end wall portion toward the distal edge 296, which may have a linear or curved shape or configuration. Additionally or alternatively, a plurality of connecting wall portions or ribs 298 may extend between the inner sidewall portion 266 and the center wall portion 300 and operatively interconnect the inner sidewall portion to the center wall portion. If included, the connecting wall portion 298 may be disposed along the end wall portion 288 and operatively connected to the end wall portion. Additionally or alternatively, the connecting wall portion 298, if included, may extend axially from or otherwise along the adjacent end wall portion 288 toward the distal edge 302, which may have a linear or curvilinear shape or configuration.

[0044] In the assembled state of the gas spring assembly 200, the end 252 of the flexible spring member 206 is received in a substantially fluid-tight manner on or along the end member assembly 204, such as, for example, on or along the mounting wall portion 244 of its segment wall 240. In such an arrangement, the spring chamber 208 can be provided in fluid communication with the end member chamber 272 via the passage 286 (if included). Additionally or alternatively, the spring chamber 208 can be provided in fluid communication with the end member chamber 276 via the passage 292 (if included).

[0045] Similarly, in some applications and / or use conditions, the end member segment 238 may take the form of a second segment or lower segment of the end member assembly. Thus, for example, the end member segment 238 may include one or more features suitable for operatively connecting the end member assembly to an adjacent structural component (such as the lower structural component LSC). As a non-limiting example, the end member segment 238 may include a segment wall 304 extending circumferentially around the axis AX. For example, the segment wall 304 may include an end wall portion 306 that is oriented transversely to the axis AX and is sized to engage adjacent structural components (such as the lower structural component LSC) in abutment. Additionally or alternatively, the segment wall 304 may optionally include one or more fixing devices operatively connected thereto. For example, the segment wall 304 may include one or more boss wall portions 308, and the fixing device 216 (e.g., a connector, a threaded fitting, and / or a threaded fastener) may be at least partially embedded in or otherwise operatively connected to the boss wall portion. However, it should be understood that other configurations or arrangements for operatively engaging one or more securing devices may alternatively be used without departing from the subject matter of the present disclosure.

[0046] The segment wall 304 can extend radially outward to an outer peripheral edge 310 that extends circumferentially about the longitudinal axis AX. The segment wall 304 can also include an inner sidewall portion 312 that extends circumferentially about the axis AX and extends axially along the end wall portion 306 toward a distal edge 314. In some cases, the segment wall 304 can include a plurality of connecting wall portions or ribs 316 that extend between the inner sidewall portion 312 and the central sidewall portion 318 and operatively interconnect the inner sidewall portions and the central sidewall portion, such as by extending along the end wall portion 306 toward a distal edge 320, which can have a linear and / or curvilinear shape and / or configuration. As a non-limiting example, the connecting wall portions 316, if included, can be arranged in a circumferentially spaced relationship with each other about the axis AX. Additionally or alternatively, the segment wall 304 may optionally include a plurality of connecting wall portions or ribs 322 extending between and operatively interconnecting the inner sidewall portion 312 and the outer peripheral edge 310, such as by extending along the end wall portion 306 toward a distal edge 324, which may have a linear and / or curvilinear shape and / or configuration. As a non-limiting example, the connecting wall portions 322 may be arranged in a circumferentially spaced relationship to one another about the axis AX.

[0047] In some cases, the end member segments 236 and 238 can be configured such that one end member segment is at least partially received within the other end member segment. As a non-limiting example, the distal edge 260 of the outer sidewall portion 256 can be offset or otherwise axially spaced a distance from the end wall portion 242, such as by Figure 7 In addition, the distal edge 268 of the inner sidewall portion 266 may be offset or otherwise axially spaced a distance from the end wall portion 242, such as by Figure 7 2. In a preferred arrangement, the offset distance OD2 is substantially less than the offset distance OD1, such as, for example, having a value in the range of about twenty-five (25) percent to about ninety (90) percent of the offset distance OD1. In such cases, a reference line RL1 projecting from distal edge 260 to distal edge 268 and sweeping about longitudinal axis AX will create or otherwise approximately define a recess 326 within the end member segment 236 having an approximately frustoconical or concave shape and / or configuration, such as may be at least partially dependent on, for example, the shape and / or configuration of the respective distal edges 296 and / or 302 of the connecting wall portions 294 and / or 298.

[0048] Continuing with the foregoing non-limiting example, the distal edge 314 of the inner sidewall portion 312 of the end member segment 238 can be offset or otherwise axially spaced a distance from the end wall portion 306 and / or its outer peripheral edge 310, such as at Figure 7 In some cases, the outer peripheral edge 310 may protrude a small amount along the end wall portion 306, such as a distance suitable for providing additional material for forming, for example, a joint or other connection. For illustrative purposes, such an offset distance is Figure 7 314. In a preferred arrangement, the offset distance OD4 is substantially less than the offset distance OD3, such as, for example, having a value in the range of about zero (0) to about forty (40) percent of the offset distance OD3. In such cases, a reference line RL2 projecting from the outer peripheral edge 310 to the distal edge 314 and sweeping about the longitudinal axis AX will produce or otherwise approximately define an approximately frustoconical or convex shape and / or configuration of the end member segment 238, such as may be at least partially dependent on, for example, the shape and / or configuration of the distal edge 324 of the connecting wall portion 322.

[0049] In the assembled state, at least a portion of the approximately frustoconical or convex shape of end member segment 238 can be received within the recess 326 of end member segment 236. In a preferred arrangement, end member segments 236 and 238 are assembled such that distal edge 268 of inner sidewall portion 266 and distal edge 314 of inner sidewall portion 312 cooperatively engage one another, such as by means of mutually engaging geometric features (e.g., cooperating grooves, shoulders, and / or v-shaped cross-sectional profiles). In such an arrangement, end member segments 236 and 238 can transmit or otherwise carry axial loads and / or forces through end member assembly 200, such as, for example, loads carried by the gas spring assembly or input forces from an internal jounce bumper.

[0050] Additionally, in such an assembled state, distal edge 296 of connecting wall portion 294 and distal edge 324 of connecting wall portion 322 are disposed in axially spaced relation to one another such that an annular gap or channel 328 is disposed between the two distal edges. Annular channel 328 is operable to permit fluid communication between connecting wall portions 294 and 322 such that end member chamber 272 serves as a continuous volume that can optionally be combined with spring chamber 208 and / or end member chamber 276, such as by means of fluid communication through passages 286 and / or 292, as discussed above.

[0051] As discussed above, the end member segments 236 and 238 are fixed together to form the end member assembly 200. It should be understood that the end member segments 236 and 238 can be fixed together in any manner and / or by any technique suitable for forming a substantially fluid-tight seal between the two end member segments. As a non-limiting example, the flow material joint JNT can be formed as a welded joint and / or a bonded joint between the outer sidewall portion 256 and the end wall portion 306, such as, for example, along the distal edge 260 and the outer peripheral edge 310 thereof, or otherwise between the distal edge and the outer peripheral edge thereof.

[0052] As discussed above, the gas spring assemblies 102 and 200 are Figures 1 to 3 The gas spring assembly is shown as being supported in the mounted state during use between two masses or structures, such as between a vehicle body BDY and a suspension component SPC or an axle AXL and / or such as between an upper structural component USC and a lower structural component LSC. The gas spring assembly thus has an assembly height in operation during use which is Figure 3 , which is indicated by reference dimension AH1, corresponds to the normal height state of the assembly. In some cases, such normal height state may be referred to as the design height. At such a design height, the rolling cam 224 of the flexible spring member 206 is disposed approximately at a predetermined design position along the outer side surface portion 262 of the outer side wall portion 256 of the end member assembly 204. The design height or position is Figure 3 Indicated by reference dimension DP1.

[0053] When the gas spring assembly 102 and / or 200 experiences changes in loading conditions or dynamic inputs during use, the gas spring assembly can be axially displaced toward a fully extended (or rebound) state in which the end members 202 and 204 are positioned further away from each other than at the design height. Alternatively, the gas spring assembly can be axially displaced in the opposite direction toward a fully compressed (or bumped) state in which the end members 202 and 204 are positioned closer to each other than at the design height. As the end members are displaced toward each other relative to the design height, the rolling lobes 224 of the flexible spring member 206 are displaced along the outer side surface portion 262 of the outer side wall portion 256 of the end member assembly 204, such as at Figure 3 The dotted line corresponds to the fully compressed position CMP of the rolling cam 224. Figure 3 The reference dimension CP1 in is indicated.

[0054] It should be recognized and appreciated that in the fully compressed state of the gas spring assembly, the flow material joint JNT is axially offset or otherwise axially spaced from the flexible spring member 206 (including its rolling lobes 224) at an axial location on or along the end member assembly 204, such as by Figure 3 Thus, the outer side surface portion 262 of the outer sidewall portion 256 provides a smooth and continuous surface portion over or along which the rolling lobes 224 of the flexible spring member 206 may shift during dynamic use as the gas spring assembly extends and compresses toward and between the fully extended and fully compressed heights. Such a smooth and continuous surface region or area is provided in FIG. Figure 3 Indicated by the reference symbol SCS.

[0055] It should be understood that the end member assembly 204 can be formed from any combination of one or more materials. In particular, it should be understood that the end member segments 236 and 238 can be formed from any combination of the same or different materials, including one end member segment formed from one polymer material and one or more end member segments formed from different polymer materials. Exemplary polymer materials can include substantially rigid polymeric materials such as, for example, fiber-reinforced polypropylene, fiber-reinforced polyamide, or unreinforced (i.e., relatively high-strength) thermoplastics (e.g., polyester, polyethylene, polyamide, polyether, or any combination thereof).

[0056] As used herein with reference to certain features, elements, components and / or structures, numerical ordinal numbers (e.g., first, second, third, fourth, etc.) may be used to represent different individual or otherwise identify certain features, elements, components and / or structures, and do not imply any order or sequence unless expressly provided by the claim language. Additionally, the terms "transverse" and the like are to be interpreted broadly. For this reason, the terms "transverse" and the like may include a wide range of angular orientations, including but not limited to approximately vertical angular orientations. Additionally, the terms "circumferential," "circumferentially," and the like may be interpreted broadly, and they may include but are not limited to circular shapes and / or configurations. In this regard, the terms "circumferential," "circumferentially," and the like may be synonymous with terms such as "peripheral," "peripherally," and the like.

[0057] Furthermore, the phrase "flowable material joint," etc., if used herein, may be interpreted to include any joint or connection in which a liquid or other flowable material (e.g., a molten material or a combination of molten materials) is disposed or otherwise present between adjacent components and serves to form a secure and substantially fluid-tight connection therebetween. Examples of processes that may be used to form such flowable material joints include, but are not limited to, conventional plastic welding processes (e.g., ultrasonic welding, spin welding, hot plate welding), such as may be formed from conventional wall configurations and / or weld joint geometries (e.g., shear joints, flange joints, tongue-and-groove joints). In such cases, one or more materials and / or combinations of materials may be used to form such flowable material joints, in addition to any materials derived from the components themselves. Another example of a process that may be used to form a flowable material joint includes applying, depositing, or otherwise presenting an adhesive between adjacent components to form a secure and substantially fluid-tight connection therebetween. In such cases, it should be understood that any suitable adhesive material or combination of materials may be used, such as, for example, one-part and / or two-part epoxies.

[0058] Furthermore, the term "gas" as used herein refers broadly to any gaseous or aerosol-like fluid. Most commonly, air is used as the working medium for gas spring devices such as those described herein, as well as suspension systems and other components thereof. However, it should be understood that any suitable gaseous fluid may be used.

[0059] It should be appreciated that many different features and / or components are shown in the embodiments shown and described herein, and no single embodiment is expressly shown and described as including all such features and components. Therefore, it should be understood that the subject matter of the present disclosure is intended to encompass any and all combinations of the different features and components shown and described herein, and that any suitable arrangement of features and components may be used in any combination without limitation. Therefore, it should be clearly understood that claims directed to any such combination of features and / or components are intended to find support in this disclosure, whether or not specifically embodied herein.

[0060] Therefore, although the subject matter of the present disclosure has been described with reference to the above-described embodiments and considerable emphasis has been placed herein on the structure and structural interrelationships between the component parts of the disclosed embodiments, it should be understood that other embodiments may be constructed and that many changes may be made to the illustrated and described embodiments without departing from the principles of the present invention. Obviously, other aspects will be modified and altered after reading and understanding the foregoing detailed description. Therefore, it should be clearly understood that the above-described descriptive issues are to be construed as merely illustrative and not restrictive of the subject matter of the present disclosure. As such, it is intended that the subject matter of the present disclosure be understood to include all such variations and modifications.

Claims

1. An end member assembly having a longitudinal axis and dimensioned to receptively engage an associated flexible spring member to form an associated gas spring assembly, the end member assembly comprising: A first end member segment including a first segment wall extending circumferentially about the longitudinal axis, the first segment wall including: a first end wall portion oriented transverse to the longitudinal axis; a mounting wall portion extending in a first axial direction along the first end wall portion, the mounting wall portion being sized to sealingly engage the associated flexible spring member; a first outer sidewall portion extending along the first end wall portion in a second axial direction opposite the first axial direction toward a first outer distal edge, the first outer distal edge being axially offset from the first end wall portion by a first outer sidewall distance, the first outer sidewall portion being disposed radially outward from the mounting wall portion and at least partially defining a first end member chamber; and a first inner sidewall portion disposed radially inwardly of the first outer sidewall portion and extending along the first end wall portion toward a first inner distal edge, the first inner distal edge being axially offset from the first end wall portion by a first inner sidewall distance, the first inner sidewall distance being less than the first outer sidewall distance of the first outer sidewall portion, such that a recess extends into the first end member segment along the first outer distal edge, the recess having a frustoconical or concave shape protruding between the first inner distal edge and the first outer distal edge; and, a second end member segment comprising a second segment wall extending circumferentially about the longitudinal axis, the second segment wall comprising: a second end wall portion oriented transverse to the longitudinal axis and including an outer peripheral edge; and, a second inner sidewall portion extending along the second end wall portion in the first axial direction toward a second inner distal edge, the second inner distal edge being axially offset from the second end wall portion by a second inner sidewall distance such that the second end member has a frustoconical or convex shape projecting between the second inner distal edge and the outer peripheral edge of the second end wall portion; The second end member segment is at least partially received within the recessed portion of the first end member segment such that the first inner distal edge and the second inner distal edge are disposed adjacent each other, and the first end member segment and the second end member segment are connected to each other along a first flow material joint formed between the first outer distal edge and the outer peripheral edge such that a substantially fluid-tight seal is formed between the first outer distal edge and the outer peripheral edge. 2 . The end member assembly of claim 1 , wherein the first outer sidewall portion includes a first outer side surface portion and a first inner side surface portion facing opposite the first outer side surface portion.

3. The end member assembly of claim 2 , wherein the first inner sidewall portion includes a second outer side surface portion and a second inner side surface portion, the second outer side surface portion being disposed in a facing relationship with the first inner side surface portion such that the first end member chamber is at least partially defined between the second outer side surface portion and the first inner side surface portion.

4. The end member assembly of claim 3, wherein the second inner surface portion at least partially defines a second end member chamber disposed radially inward of at least a portion of the first end member chamber.

5. The end member assembly of any one of claims 1 to 4, wherein the first segment wall includes a third inner sidewall portion extending in the first axial direction along one of the first end wall portion and the first inner sidewall portion such that the third inner sidewall portion is axially coextensive with the mounting wall portion.

6. The end member assembly of claim 5, wherein the first segment wall includes a third end wall portion oriented transverse to the longitudinal axis and extending across the third inner sidewall portion in axially offset relationship to the first end wall portion.

7. The end member assembly of claim 6, wherein a first passage extends through the third end wall portion in fluid communication with the second end member chamber.

8. The end member assembly of claim 7, wherein the first passage is one of a plurality of first passages disposed in circumferentially spaced relationship with one another about the longitudinal axis.

9. The end member assembly according to any one of claims 5 to 8, wherein the third inner sidewall portion is arranged radially inwardly of the mounting wall portion so that an annular gap is formed between the third inner sidewall portion and the mounting wall portion, and the annular gap extends axially between the first end wall portion and the open end opposite to the first end wall portion.

10. The end member assembly of claim 9, wherein a second passage extends through the first end wall portion in fluid communication between the annular gap and the first end member chamber.

11. The end member assembly of claim 10, wherein the second passage is one of a plurality of second passages disposed in circumferentially spaced relationship with one another about the longitudinal axis.

12. An end member assembly having a longitudinal axis and dimensioned to receptively engage an associated flexible spring member to form an associated gas spring assembly, the end member assembly comprising: A first end member segment including a first segment wall extending circumferentially about the longitudinal axis, the first segment wall including: a first end wall portion oriented transverse to the longitudinal axis; a mounting wall portion extending in a first axial direction along the first end wall portion, the mounting wall portion being sized to sealingly engage the associated flexible spring member; a first outer sidewall portion disposed radially outwardly of the mounting wall portion, the first outer sidewall portion including a first outer side surface portion and a first inner side surface portion, the first outer sidewall portion extending in a second axial direction opposite the first axial direction toward a first outer distal edge; a first inner sidewall portion, the first inner sidewall portion being disposed radially inward of the first outer sidewall portion, the first inner sidewall portion including a second outer side surface portion and a second inner side surface portion, the second outer side surface portion being disposed in confronting relation with the first inner side surface portion such that a first end member chamber is at least partially defined between the second outer side surface portion and the first inner side surface portion, and the second inner side surface portion at least partially defines a second end member chamber, the second end member chamber being disposed radially inward of at least a portion of the first end member chamber; a second inner sidewall portion extending in the first axial direction along one of the first end wall portion and the first inner sidewall portion such that the second inner sidewall portion is axially coextensive with the mounting wall portion; a second end wall portion oriented transverse to the longitudinal axis and extending across the second inner sidewall portion in an axially offset relationship to the first end wall portion; at least one passage extending through the second end wall portion in fluid communication with the second end member chamber; and, a second end member segment including a second segment wall extending circumferentially about the longitudinal axis, the second segment wall including a third end wall portion oriented transverse to the longitudinal axis and including an outer peripheral edge; The first end member segment and the second end member segment are connected to each other by a flow material joint formed between the first outer distal edge and the outer peripheral edge so that a substantially fluid-tight seal is formed between the first outer distal edge and the outer peripheral edge, the flow material joint being positioned toward an end of the end member assembly opposite the first end wall portion so that the flow material joint is offset from the associated flexible spring member in the second axial direction in an associated fully compressed height of the associated gas spring assembly.

13. The end member assembly of claim 12, wherein the first inner sidewall portion of the first segment wall of the first end member segment extends axially toward a first inner distal edge.

14. The end member assembly of claim 13, wherein the second segment wall of the second end member segment includes a third inner sidewall portion disposed radially inward of the outer peripheral edge.

15. The end member assembly of claim 14, wherein the third inner sidewall portion extends axially along the end wall portion toward the second inner distal edge.

16. The end member assembly according to any one of claims 13 to 15, wherein the first inner distal edge is disposed axially proximal of the mounting wall portion relative to the first outer distal edge.

17. The end member assembly of any one of claims 15 and 16, wherein the first inner distal edge and the second inner distal edge are disposed axially proximal of the mounting wall portion relative to the first outer distal edge and the outer peripheral edge.

18. The end member assembly of any one of claims 1 to 17, wherein the first segment wall of the first end member segment includes a first plurality of outer rib walls extending between and operatively connecting the first outer sidewall portion and the first inner sidewall portion.

19. The end member assembly of claim 18, wherein the first plurality of outer rib walls each extend axially toward a first distal rib edge.

20. An end member assembly according to any one of claims 1 to 19, wherein the second segment wall of the second end member segment includes a second plurality of outer rib walls, which extend between the outer peripheral edge and the second (or third) inner wall portion and operatively connect the outer peripheral edge and the second (or third) inner wall portion.

21. The end member assembly of claim 20, wherein the second plurality of outer rib walls each extend axially toward a second distal rib edge.

22. The end member assembly of any one of claims 18 to 21, wherein the first distal rib edge and the second distal rib edge are disposed in an axially spaced relationship from one another such that an annular channel is at least partially formed therebetween.

23. The end member assembly of any one of claims 1 to 22, wherein a first contour reference line sweeping about the longitudinal axis protruding from the first inner distal edge to the first outer distal edge generates the recess having the frustoconical or concave shape.

24. The end member assembly of any one of claims 1 to 23, wherein a second contour reference line swept about the longitudinal axis protruding from the second inner distal edge to the outer peripheral edge of the second end wall portion generates the frustoconical or convex shape of the second end member section.

25. The end member assembly of any one of claims 1 to 24, wherein the first end member segment is at least partially formed from a first amount of polymeric material and the second end member segment is at least partially formed from a second amount of polymeric material separate from the first end member segment.

26. A gas spring assembly, comprising: a flexible spring member having a longitudinal axis and including a flexible wall extending circumferentially about the longitudinal axis between a first end and a second end of the flexible spring member to at least partially define a spring chamber between the first end and the second end of the flexible spring member; an end member secured across the first end of the flexible spring member such that a substantially fluid-tight connection is formed between the end member and the first end of the flexible spring member; and, 26. The end member assembly of any one of claims 1 to 25, the end member assembly being secured across the second end of the flexible spring member such that a substantially fluid-tight connection is formed between the end member assembly and the second end of the flexible spring member.

27. A gas spring assembly having a fully compressed height and comprising: a flexible spring member having a longitudinal axis and including a flexible wall extending circumferentially about the longitudinal axis between a first end and a second end of the flexible spring member to at least partially define a spring chamber between the first end and the second end of the flexible spring member; an end member secured across the first end of the flexible spring member such that a substantially fluid-tight connection is formed between the end member and the first end of the flexible spring member; and, an end member assembly secured across the second end of the flexible spring member such that a substantially fluid-tight connection is formed between the end member assembly and the second end of the flexible spring member, the end member assembly comprising: A first end member segment including a first segment wall extending circumferentially about the longitudinal axis, the first segment wall including: a first end wall portion oriented transverse to the longitudinal axis; a mounting wall portion extending in a first axial direction along the first end wall portion, the mounting wall portion being sized to sealingly engage the flexible spring member; a first outer sidewall portion disposed radially outwardly of the mounting wall portion, the first outer sidewall portion including a first outer side surface portion and a first inner side surface portion, the first outer sidewall portion extending in a second axial direction opposite the first axial direction toward a first outer distal edge; a first inner sidewall portion, the first inner sidewall portion being disposed radially inward of the first outer sidewall portion, the first inner sidewall portion including a second outer side surface portion and a second inner side surface portion, the second outer side surface portion being disposed in confronting relation with the first inner side surface portion such that a first end member chamber is at least partially defined between the second outer side surface portion and the first inner side surface portion, and the second inner side surface portion at least partially defines a second end member chamber, the second end member chamber being disposed radially inward of at least a portion of the first end member chamber; a second inner sidewall portion extending in the first axial direction along one of the first end wall portion and the first inner sidewall portion such that the second inner sidewall portion is axially coextensive with the mounting wall portion, the second inner sidewall portion being disposed radially inward of the mounting wall portion such that an annular gap is formed between the second inner sidewall portion and the mounting wall portion, the annular gap extending axially between the first end wall portion and an open end opposite the first end wall portion; a second end wall portion oriented transverse to the longitudinal axis and extending across the second inner sidewall portion in an axially offset relationship to the first end wall portion; a first passage extending through the first end wall portion in fluid communication between the annular gap and the first end member chamber; and, a second passage extending through the second end wall portion in fluid communication with the second end member chamber; and a second end member segment including a second segment wall extending circumferentially about the longitudinal axis, the second segment wall including a third end wall portion oriented transverse to the longitudinal axis, the third end wall portion extending radially outward to an outer peripheral edge; The first end member segment and the second end member segment are connected to each other by a flow material joint formed between the first outer distal edge and the outer peripheral edge so that a substantially fluid-tight seal is formed between the first outer distal edge and the outer peripheral edge, wherein the flow material joint is disposed in an axially spaced relationship from the flexible spring member at the fully compressed height of the gas spring assembly.

28. The gas spring assembly of claim 27, wherein the first inner sidewall portion of the first segment wall of the first end member segment extends in the second axial direction toward a first inner distal edge.

29. The gas spring assembly of claim 28, wherein the second segment wall of the second end member segment includes a third inner sidewall portion disposed radially inward of the outer peripheral edge.

30. The gas spring assembly of claim 29, wherein the third inner sidewall portion extends axially along the end wall portion toward the second inner distal edge.

31. The gas spring assembly according to any one of claims 27 to 30, wherein the first inner distal edge is disposed proximally of the mounting wall portion relative to the first outer distal edge in the first axial direction.

32. The gas spring assembly of any one of claims 30 and 31, wherein the first inner distal edge and the second inner distal edge are disposed axially proximal of the mounting wall portion relative to the first outer distal edge and the outer peripheral edge.

33. The gas spring assembly of any one of claims 27 to 32, wherein the first segment wall of the first end member segment includes a first plurality of outer rib walls extending between and operatively connecting the first outer sidewall portion and the first inner sidewall portion.

34. The gas spring assembly of claim 33, wherein the first plurality of outer rib walls each extend axially toward a first distal rib edge.

35. The gas spring assembly of any one of claims 29 to 34, wherein the second segment wall of the second end member segment includes a second plurality of outer rib walls extending between and operatively connecting the third end wall portion and the third inner sidewall portion.

36. The gas spring assembly of claim 35, wherein the second plurality of outer rib walls each extend axially toward a second distal rib edge.

37. The gas spring assembly of any one of claims 34 to 36, wherein the first distal rib edge and the second distal rib edge are disposed in axially spaced relationship to each other such that an annular channel is at least partially formed therebetween.

38. A suspension system, comprising: a compressed gas system comprising a compressed gas source and a control device in fluid communication with the compressed gas source; as well as, At least one gas spring assembly according to any one of claims 26 to 37, said at least one gas spring assembly being arranged in fluid communication with said source of compressed gas, said control device being arranged in fluid communication between said gas spring assembly and said source of compressed gas.

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