DESC:NOISE ABSORBING MECHANISM FOR A SHOCK ABSORBER
Field of the invention
The present invention generally relates to shock absorbers and, more particularly, to a noise absorbing mechanism for the shock absorber.
Background of the invention
In a suspension system, a spring sets the ride height and absorbs the bumps in the road. When a vehicle wheel encounters a bump in the road and causes the spring to coil and uncoil, the energy of the spring is transferred to a shock absorber through an upper mount, down through a piston rod and into the piston. Currently, the recoil spring is free to move on the piston rod from the rod guide to the retainer valve. During high speed/velocity the recoil spring is moving up/down, and sometimes it makes noise. Furthermore, during the flow of compression stroke oil from bottom to upward, the spring also moves. Thus, the up/down movements of the recoil spring creates noise.
Accordingly, there exists a need to provide a noise absorbing mechanism for a shock absorber that overcomes the abovementioned drawbacks of the prior art.
Object of the invention
An object of the present invention is to absorb noise in a shock absorber.
Another object of the present invention is to provide a noise-free design for the recoil spring of a shock absorber.
Another object of the present invention is to redesign the existing components for providing a noise-free mechanism of a shock absorber.
Yet another object of the present invention is to provide a noise absorbing mechanism for a recoil spring movement without any additional component.
Summary of the invention:
Accordingly, the present invention provides a noise absorbing mechanism for a shock absorber. The noise absorbing mechanism comprises a piston rod, a rod guide, a piston, a piston ring, a valve pack, a recoil spring, a retainer valve, a nyloc nut, a case cap, and an oil seal. The piston rod includes a step provided on the bottom side to place the recoil spring thereon with help of the retainer valve. This fixation prevents the up-down movement of the recoil spring, which reduces the noise.
Brief description of the drawings
Figure 1 shows an overview of a noise absorbing mechanism for a shock absorber, in accordance with the present invention;
Figure 2 shows extended view of a noise absorbing mechanism in connected position, in accordance with the present invention;
Figure 3 shows a piston rod, in accordance with the present invention; and
Figure 4 shows a recoil spring, in accordance with the present invention.
Detailed description of the invention
The foregoing objects of the present invention are accomplished, and the problems and shortcomings associated with the prior art, techniques and approaches are overcome by the present invention as described below in the preferred embodiments.
Accordingly, the present invention provides a noise absorbing mechanism for a shock absorber. The noise absorbing mechanism of the present invention helps in reducing recoil spring noise in the shock absorber.
This present invention is illustrated with reference to the accompanying drawings, throughout which reference numbers indicate the corresponding parts in various figures. These reference numbers are shown in the bracket in the following description.
Referring to figures 1-4, a noise absorbing mechanism (100) (hereinafter “the mechanism (100)”) for a shock absorber (not numbered) in accordance with the present invention is shown.
As shown in figure 1, the mechanism (100) comprises a piston rod (20), a rod guide (21), a piston (30), a piston ring (31), a valve pack (40), a recoil spring (50), a retainer valve (60), a nyloc nut (70), a case cap (80), and an oil seal (90).
The piston rod (20) is connected with the rod guide (21) at the top side thereof. Furthermore, the piston rod (20) is operably connected with the piston (30) through the valve pack (40) there between. The piston ring (31) is attached to the outer diameter of the piston (30) for securing the piston (30) to the piston rod (20). The piston rod (20) holds the piston (30) and the valve pack (40) for developing the damping force. Additionally, the piston rod (20) is connected to the nyloc nut (70) for locking the piston (30) thereto.
In an embodiment, the piston rod (20) includes a step (10) provided on the bottom side thereof (as shown in figure. 3). The recoil spring is used to absorb the energy during extended condition and avoids topping. In an embodiment, the recoil spring (50) has a first end (51) with reduced inner diameter (as shown in figure. 4) coupled to the step (10) of the piston rod (20) and a second end (52) encompassing the piston rod (20). Specifically, the first end (51) is fixed with the step (10) using the retainer valve (60). The other end of the recoil spring is freely encompassing the piston rod (20). This fixation of the recoil spring (50) on the piston rod (20) prevents the up-down movement of the recoil spring (50). Thus eliminating the contact of the recoil spring (50) with the rod guide (21) and the retainer valve (60). This helps in absorbing the noise in the shock absorber. Further, the retainer valve (60) withstands the topping load and also provides support to the valve pack (40).
The case cap (80) is coupled below the rod guide (21) to the top of the piston rod (20). The case cap (80) and the rod guide (21) is used to encase the oil seal (90) to the piston rod (20) thereon.
The mechanism (100) is applicable to all types of shock absorbers having a recoil spring (50).
Advantages of the invention:
1. The present invention provides a noise-free design for the movement of the recoil spring (50).
2. The present invention is applicable for all types of shock absorbers having the recoil spring (50).
3. The present invention provides a noise-free shock absorber with lower manufacturing cost.
The foregoing descriptions of specific embodiments of the present invention have been presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the present invention to the precise forms disclosed, and obviously many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the present invention and its practical application, to thereby enable others skilled in the art to best utilize the present invention and various embodiments with various modifications as are suited to the particular use contemplated. It is understood that various omission and substitutions of equivalents are contemplated as circumstance may suggest or render expedient, but such are intended to cover the application or implementation without departing from the scope of the present invention.
,CLAIMS:We claim:

1. A noise absorbing mechanism (100) for a shock absorber, the noise absorbing mechanism (100) comprising:
a piston (30);
a piston rod (20) operably connected to the piston (30);
a recoil spring (50) encompassing the piston rod (20);
characterized in that,
the piston rod (20) includes a step (10) providing on the bottom side thereof;
the recoil spring (50) includes a first end (51) attached with the step (10) of the piston rod (20) and a second end (52) encompassing the piston rod (20);
a retainer valve (60) mounted on the piston rod (20);
wherein, the first end (51) of the recoil spring (50) is fixed on the step (10) of the piston rod (20) using the retainer valve (60) for restricting the up-down movement of the recoil spring (50), thereby eliminating the noise produced by the recoil spring (50).
2. The noise absorbing mechanism (100) as claimed in claim 1, wherein the first end (51) of the recoil spring (50) having reduced inner diameter at the position of the step (10) of the piston rod (20).

Dated this on 27th day of June, 2020

Prafulla Wange
(Agent for Applicant)
IN-PA/2058