Claims:1. A sub frame assembly 100 in an air suspension system, comprising:
a left pressing member 101;
a right pressing member 102;
a front cross member 103 joining the left pressing member 101 and the right pressing member 102 at a left front end 101a side and a right front end 102a side;
a rear cross member 104 joining the left pressing member 101 and the right pressing member 102 at a left rear end 101b side and a right rear end 102b side;
a plurality of piston mounting plates 107 fixed at left front end 101a, left rear end 101b, right front end 102a, right rear end 102b;
leveling valve clamps 106 provided below the left pressing member 101 and the right pressing member 102;
base plates 105 provided below the left pressing member 101 and the right pressing member 102;
characterized in that
the base plates 105 having a plurality of protruding sections 301 extending upwards on both sides of the pressing members 101, 102 for distributing stress.
2. The sub frame assembly as claimed in claim 1, wherein a distance in the range of 50mm to 80 mm is provided between the plurality of protruding sections 301.
3. The sub frame assembly as claimed in claim 1, wherein a shape of the plurality of protruding sections 301 is rectangular.
4. The sub frame assembly as claimed in claim 1, wherein the plurality of protruding sections 301 is fixed on a bottom plate 302 of the base plate 105.
5. The sub frame assembly as claimed in claim 1, wherein height of cross section of the left hand pressing member 101 and the right hand pressing member 102 is in the range of 180 mm to 200 mm.
6. The sub frame assembly as claimed in claim 5, wherein the left hand pressing member 101 and the right hand pressing member 102 can support a rear axle weight up to 13 ton.
7. The sub frame assembly as claimed in claim 1, wherein distance of the leveling valve clamp 106 from the base plate 105 is in the range of 310mm to 330mm for reducing stress.
, Description:TECHNICAL FIELD
[0001] The embodiment herein generally relates to a sub frame assembly. More specifically, the invention relates to a rear axle sub frame assembly in an air suspension system of an automobile.
BACKGROUND AND PRIOR ART
[0002] Suspension is an integral system in an automobile which protects the automobile and provides comfort. The suspension system evenly supports the weight of a vehicle and helps in keeping contact between tires and the road surface. The suspension system maintains the vehicle height and reduces the effect of forces on the vehicle by absorbing and dampening shocks due to road conditions and provides steering stability. Generally, an air suspension system is used in heavy vehicles such as buses, trucks, trailers as it provides better support in variable road conditions. A sub frame in an air suspension system connects the left side and right sides of the vehicle and shares the weight acting upon it on four plates in four corners of the sub frame. The weight and various other forces acting on the components of a sub frame in an air suspension system induce stresses. The life of these components of the sub frame decrease due to these stresses. Also, the existing sub frames in an air suspension system are not capable of withstanding heavy rear axle weights for a large number of cycles during testing.
Therefore, there is a need for a rear axle sub frame assembly in an air suspension system of an automobile. In particular, there is a need for a sub frame assembly in an air suspension system of an automobile which can reduce stresses and withstand heavy rear axle weights.
OBJECTS
[0003] Some of the objects of the present disclosure are described herein below:
[0004] A main object of the present disclosure is to provide a rear axle sub frame assembly in an air suspension system.
[0005] Another object of the present disclosure is to provide a rear axle sub frame assembly in an air suspension system for withstanding heavy rear axle weights.
[0006] Yet another object of the present disclosure is to provide a rear axle sub frame assembly in an air suspension system having reduced stress.
[0007] Still another object of the present disclosure is to provide a rear axle sub frame assembly in an air suspension system having a longer life.
[0008] The other objects and advantages of the present disclosure will be apparent from the following description when read in conjunction with the accompanying drawings, which are incorporated for illustration of preferred embodiments of the present invention and are not intended to limit the scope thereof.
SUMMARY
[0009] In view of the foregoing, an embodiment herein provides a sub frame assembly in an air suspension system. The sub frame assembly comprises of a left pressing member, a right pressing member. A front cross member is provided for joining the left pressing member and the right pressing member at a left front end side and right front end side and a rear cross member is provided for joining the left pressing member and the right pressing member at a left rear end side and a right rear end side. A plurality of piston mounting plates is fixed at left front end and left rear end of the left pressing member and right front end and right rear end of the right pressing member. Leveling valve clamps are provided below the left pressing member and the right pressing member. Base plates are provided below the left pressing member and the right pressing member. The base plates include a plurality of protruding sections extending upwards on both sides of the pressing members for distributing stress.
[00010] In accordance with an embodiment, a distance in the range of 50mm to 80mm is provided between the plurality of protruding sections. In an embodiment, a shape of the plurality of protruding sections is rectangular. In an embodiment, the plurality of protruding sections is fixed on a bottom plate of the base plate.
[00011] In accordance with an embodiment, height of cross section of the left pressing member and the right pressing member is in the range of 180 mm to 200 mm. In an embodiment, the left hand pressing member and the right hand pressing member can handle a rear axle weight up to 13 ton.
[00012] In accordance with an embodiment, distance of the leveling valve clamp from the base plate is in the range of 310mm to 330mm for reducing stress.
[00013] These and other aspects of the embodiments will be better appreciated and understood when considered in conjunction with the following description and the accompanying drawings. It should be understood, however, that the following descriptions, while indicating preferred embodiments and numerous specific details thereof, are given by way of illustration and not of limitation. Many changes and modifications may be made within the scope of the embodiments without departing from the spirit thereof, and the embodiments include all such modifications.

BRIEF DESCRIPTION OF DRAWINGS
[00014] The detailed description is set forth with reference to the accompanying figures. In the figures, the left-most digit(s) of a reference number identifies the figure in which the reference number first appears. The use of the same reference numbers in different figures indicates similar or identical items.
[00015] Fig.1 illustrates a schematic diagram of a sub frame assembly 100, according to an embodiment herein; and
[00016] Fig.2 illustrates a sectional view of a pressing member 101, 102 according to an embodiment herein.
[00017] Fig.3 illustrates a perspective view of a base plate 105 according to an embodiment herein.
[00018] Fig.4 illustrates a bottom view of pressing member 101, 102 according to an embodiment herein.
LIST OF NUMERALS
100 - Sub frame assembly
101 - Left pressing member
101a - Left front end
101b - Left rear end
102 - Right pressing member
102a - Right front end
102b - Right rear end
103 - Front cross member
104 - Rear cross member
105 - Base plate
106 - Leveling valve clamp
107 - Plurality of piston mounting plates
200 - Sectional view of pressing member
201 - Top pressing
202 - Bottom pressing
300 - Perspective view of base plate
301 - Plurality of protruding sections
302 - Bottom plate
400 - Bottom view of pressing member
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[00019] The embodiments and the various features and advantageous details thereof are explained more fully with reference to the non-limiting embodiments and detailed in the following description. Descriptions of well-known components and processing techniques are omitted so as to not unnecessarily obscure the embodiments. The examples used are intended merely to facilitate an understanding of ways in which the embodiments may be practiced and to further enable those of skill in the art to practice the embodiments. Accordingly, the examples should not be construed as limiting the scope of the embodiments.
[00020] As mentioned above, there is a need for a rear axle sub frame assembly in an air suspension system of an automobile. In particular, there is a need for a rear axle sub frame assembly in an air suspension system of an automobile for withstanding heavy rear axle weights and having reduced stresses. The embodiments achieve this by providing “A sub frame assembly of a vehicle suspension unit”. Referring now to the drawings, and more particularly to Figs. 1 through 4, where similar reference characters denote corresponding features consistently throughout the figures, there are shown preferred embodiments.
[00021] Fig.1 illustrates a schematic diagram of a sub frame assembly in an air suspension system, according to an embodiment. The sub frame assembly 100 comprises of a left pressing member 101, a left front end 101a, a left rear end 101b, a right pressing member 102, a right front end 102a, a right rear end 102b, a front cross member 103, a rear cross member 104, base plates 105, leveling valve clamps 106, and a plurality of piston mounting plates 107. The left pressing member 101 includes the left front end 101a and the left rear end 102b. The right pressing member 102 includes the right front end 102a and the right rear end 102b. The front cross member 103 joins the left pressing member 101 at the left front end 101a side and the right pressing member 102 at the right front end 102a side. The rear cross member joins the left pressing member 101 at the left rear end 101b side and the right pressing member 102 at the right rear end 102b side.
[00022] In an embodiment, base plates 105 are provided below the left pressing member 101 and below the right pressing member 102.
[00023] In an embodiment, the leveling valve clamp 106 is provided below the left pressing member 101 and the right pressing member 102.
[00024] Fig.2 illustrates a sectional view of the pressing member 101, 102 according to an embodiment. The left pressing member 101 and the right pressing member 102 include a top pressing 201 and a bottom pressing 202.
[00025] In an embodiment, height of the top pressing 201 and height of the bottom pressing 202 is increased by 10mm. In an embodiment, height of the left pressing member 101 and height of the right pressing member 102 is in the range of 180mm to 200mm.
[00026] In an embodiment, the left pressing member 101 and the right pressing member 102 can support a rear axle weight up to 13 ton.
[00027] Fig.3 illustrates a perspective view of a base plate, according to an embodiment. The base plate 105 below the left pressing member 101 and the right pressing member 102 includes a plurality of protruding sections 301.
[00028] In an embodiment, the base plate 105 includes a bottom plate 302 and a plurality of protruding sections 301 fixed on the bottom plate 302. The plurality of protruding sections 301 are provided for increasing the effective area of stress and thereby reducing the stress. In an embodiment, the plurality of protruding sections 301 is welded on the bottom plate 302.
[00029] In a preferred embodiment, a shape of the bottom plate 302 is rectangular. In an embodiment, a shape of the protruding sections 301 is rectangular. In an embodiment, size of the plurality of protruding sections 301 is different.
[00030] In an embodiment, a distance in the range of 50mm-80mm is provided between the plurality of protruding sections 301.
[00031] Fig.4 illustrates a bottom view of pressing member 101,102. The left pressing member 101, right pressing member 102 include the base plate 105 and the leveling valve clamp 106.
[00032] In an embodiment, the leveling valve clamp 106 is placed away from the base plate 105 at a distance in the range of 310mm to 330mm for reducing stress at a bending zone on the left pressing member 101 and the right pressing member 102.
[00033] A main advantage of the present disclosure is that the sub frame assembly can withstand up to 6,50,000 cycles (average) at in-house rig testing for a rear axle weight up to 13 ton.
[00034] Another advantage of the present disclosure is that the sub frame assembly can support a rear axle weight up to 13 ton.
[00035] Still another advantage of the present disclosure is the reduced stress on the sub frame assembly.
[00036] Yet another advantage of the present disclosure is that the stress at a bending zone is reduced.
[00037] The foregoing description of the specific embodiments will so fully reveal the general nature of the embodiments that others can, by applying current knowledge, readily modify and/or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology or terminology employed is for the purpose of description and not of limitation. Therefore, while the embodiments have been described in terms of preferred embodiments, those skilled in the art will recognize that the embodiments can be practiced with modification within the spirit and scope of the embodiments as described.