Patent Application
20230349441
The present application relates to a chassis and air suspension of a motor vehicle, and more particularly to an air sprig gaiter.
Suspension systems for automotive vehicles provide vehicle passengers with a more comfortable ride. Air suspension systems utilize air springs, rather than traditional coil springs, and provide different suspension qualities that may be preferable in some vehicles to traditional coil spring suspensions.
A conventional air spring is a device that is arranged between a vehicle body and chassis. The typical air spring has at least one working space or cavity that is filled with compressed air. Space constraints can limit the amount of working space for the air spring assembly, especially as vehicles are designed with increasingly tighter space constraints.
One component of an air spring is a gaiter, which provides protection to components of the air spring including a piston and damper. The gaiter may be configured as a sawtooth gaiter with or without special folds, a rubber/EPDM material that folds in reverse of the air spring bellow, a stretchy elastic gaiter, and multiple corrugated gaiters working in conjunction.
Conventionally, manual assembly of gaiters for guided air springs is necessary. In one example, the addition of an Oetiker clamp is required to secure the gaiter to the guide tube.
Accordingly, there exists a need for an air spring assembly having a gaiter suitable for ease of installation and reduced total compressed height, and thus an improved gaiter for the air spring.
Aspects of embodiments of the present application relate to an air spring gaiter with a reduced upper diameter to easily permit machine assembly and retainment.
According to aspects of the embodiments, a primary function of the gaiter design enables a lead on an upper side of the gaiter to snap into an inner diameter flange on a guide tube. Upon securing the gaiter to the guide tube, the structure of the air spring assembly is securely retained when the air spring is stroked in either an upwards direction or a downwards direction. Therefore, automated operation for assembly may be provided, while still retaining a primary function of the gaiter as a debris shield for the bellow of the air spring assembly.
According to an aspect of an embodiment, there is provided an air spring assembly including a guide tube, the guide tube comprising a retainment tab disposed at a free end of the guide tube, a gaiter, the gaiter comprising a flange disposed at a free end of the gaiter, wherein the retainment tab is configured to be disposed within the flange to couple the guide tube and the gaiter.
The above and other aspects will be more clearly understood from the following brief description taken in conjunction with the accompanying drawings, in which:
As illustrated in
The guide tube 210 may have an inner diameter 215 and an outer diameter 217. Accordingly, a thickness of the guide tube may be a difference between the inner diameter 215 and the outer diameter 217.
The gaiter may include a plurality of folds 221. The plurality of folds may include a plurality of concave folds 222 and a plurality of convex folds 223. Each concave fold among the plurality of concave folds 222 may be alternatingly coupled to a convex fold among the plurality of convex folds 223.
The gaiter 220 may have a first diameter 224. The first diameter 224 may be a distance between opposing concave folds among the plurality of concave folds 222. The first diameter 224 of the gaiter 220 may be referred to as an inner diameter of the gaiter 220. The first diameter 224 of the gaiter 220 may be less than the inner diameter 215 of the guide tube 210.
The gaiter may also have a second diameter 225. The second diameter 225 may be a distance between opposing convex folds among the plurality of convex folds 225. The second diameter 225 of the gaiter 220 may be referred to as an outer diameter of the gaiter 220. The second diameter 225 of the gaiter may be greater than the outer diameter 217 of the guide tube 210.
The gaiter 220 includes a free end 230. The free end 230 of the gaiter 220 may be a referred to as a distal end or terminating end of the gaiter 220. A diameter 235 of the free end 230 of the gaiter 220 may be less than the inner diameter 215 of the guide tube 210. Moreover, as will be described later, the diameter 235 of the free end 230 of the gaiter may be less than a diameter of the guide tube 210 and retainment tab 242. As a result of the diameter 235 of the free end 230 of the gaiter 220 being less than the diameter 215 of the guide tube 210, an automated, machine press fitting of the guide tube 210 and the gaiter 220 may be performed.
The guide tube 210 may include a free end 240. The free end 240 of the guide tube 210 may be a referred to as a distal end or terminating end of the guide tube 210. The free end 240 of the guide tube 210 may include a retainment tab 242. The retainment tab 242 may be a portion of the guide tube 210 disposed inwardly towards the inner surface of the guide tube. The retainment tab 242 may be formed to have an angle of approximately 90 degrees from a longitudinal direction of a longitudinal wall of the guide tube 210. A width 243 of the retainment tab 242 may be greater than the thickness of the guide tube 210 between the inner diameter 215 of the guide tube and the outer diameter 217 of the guide tube 210.
The free end 230 of the gaiter 220 may be coupled to a terminal convex fold 226 among the plurality of convex folds 223. The free end 230 of the gaiter 220 may include a flange 232 or recess. The flange 232 may extend inwardly from the convex fold 226 to have an angle of approximately 90 degrees from a longitudinal direction of a longitudinal wall of the guide tube 210. Accordingly, the retainment tab 242 and the flange 232 may both extend inwardly towards a center of the guide tube 210 and the air spring assembly 200 at an angle of approximately 90 degrees from a longitudinal direction of a longitudinal wall of the guide tube 210. As a result, the guide tube 210 may not extend downwardly along the gaiter 220 beyond the flange 232 when press fit to the gaiter 220.
A width 233 of the flange 232 coupled to the convex fold 226 may be substantially equal to the width 243 of the retainment tab 240. Accordingly, a size and shape of the retainment tab 240 may correspond to a size and shape of the flange 232, and the retainment tab 240 may be configured to abut the flange 232 when the retainment tab 242 is disposed within the flange 232. As a result, retainment tab 242 of the free end 240 guide tube 210 may be snap fit to the flange 232 of the free end 230 of the gaiter 220.
As opposed to a convex fold similar to the plurality of convex folds 223, the free end 230 of the gaiter 220 may include a vertical portion 236 coupled to the flange 232. A diameter of the free end 230 of the gaiter 220 at the location of the vertical portion 236 may be substantially equal to the inner diameter 215 of the guide tube. Accordingly, the vertical portion 236 of the free end 230 of the gaiter 220 may be configured to abut an inner surface of the guide tube 210 having the inner diameter 215.
Consequently, the structure of the air spring assembly according to embodiments of the present application obviates the need for the manual assembly of the gaiter and outer guide tube. Further, the structure of the air spring assembly according to embodiments of the present application reduces overall cost through omission of additional fasteners required to secure the gaiter and guide tube. Moreover, a compact air spring assembly may be achieved by reducing package space for the gaiter under the guide tube.
