DESC:Field of the invention
The present invention relates to shock absorber/dampers and more particularly, to a piston for grease damper.
Background of the invention
Prior art shock absorber/ damper seldom use grease as damping medium. In certain applications it is required to maintain grease as damping medium. The drawback of those dampers is that the grease has tendency to get solidified in the unused zone of the damper which becomes an issue of concern in utility. The grease in this unused area of the damper becomes a cake and is longer usable as damping medium.
Another aspect which is been observed is when a shock absorber is designed it is designed for worst case scenarios. The fact is that occurrence of the worst case scenario is very rare during use. To illustrate, if a damper is designed to have a stroke length of 50 mm i.e. the full stroke length is only used in an event of worst case scenario. In normal operations, the stroke length is limited to 20-30mm wherein the stroke length of bottom 20 mm always becomes an unused length and the grease in those areas gets compacted and becomes solidified in time.
Accordingly, there is a need of improved piston to prevent caking of grease within unused length of a damper by overcoming the above mentioned drawbacks of the prior art.
Objects of the invention
An object of the present invention is to prevent caking of grease within unused length a damper.
Another object of the present invention is to facilitate high damping applications to develop with lesser volume of damping medium.
Yet another object of the present invention is to facilitate use of grease as a damping medium
Summary of the invention
The present invention provides a grease damper piston that prevents caking of grease within a length unused during the operation cycle. A piston head of the piston of the grease damper is modified with two orifices bored therethrough, such that the orifices are having hollow tubular structures with one end having a larger diameter than the other end and the orifices make a slanting angle towards each other in the piston head. During the operation cycle, the grease passing through the orifices impacts the unused grease, acting as a jet spray thereby causing disturbance vortex. The orifices also enable to create a swivel effect to the grease getting extruded through the hole.
Brief description of the drawings
The objectives and advantages of the present invention will become apparent from the following description read in accordance with the accompanying drawings wherein,
Figure 1 shows a cross-sectional view of a piston of a grease damper, 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 embodiment.
The present invention provides a piston of a grease damper that prevents caking of grease within unused length.
The present invention is illustrated with reference to the accompanying drawings, wherein numbers indicated in the bracket represent the components of the invention throughout the description.
Referring now to figure1, a cross-sectional view of a piston of a grease damper (100) in accordance with the present invention is shown. The piston is linearly displaceable within a cylinder (20). The piston has a piston rod (30) on one side and has a piston head (40) on another side. The piston head (40) is a cylindrical disc which has a first orifice (60A) and a second orifice (60A’) connecting two plane surfaces of the piston head (40). The first orifice (60A) and a second orifice (60A’) are hollow tubular structures having one end with a larger diameter than the other end. The first orifice (60A) is placed inversely with respect to the second orifice (60A’) such that the first orifice (60A) and a second orifice (60A’) make a slanting angle towards each other in the piston head (40). The first orifice (60A) and a second orifice (60A’) are designed such that they provide velocity to the grease passing therethrough to impact the unused grease, acting as a jet spray thereby causing disturbance vortex. The first orifice (60A) and a second orifice (60A’) also enable to create a swivel effect to the grease getting extruded through the hole.
During an operation cycle, when the piston is set in motion, the piston head (40) also moves up and down along, thereby the grease passes through the first orifice (60A) and a second orifice (60A’). The resulting grease jet action disturbs the residual grease accumulated at an unused stroke of the grease damper (100) thereby stopping the residual grease from process of getting caked or becoming solid.
Advantages of the invention
• The piston for grease damper (100) prevents caking of grease within unused length a damper.
• The piston for grease damper (100) facilitates high damping applications to developed with lesser volume of damping medium.
• The piston for grease damper (100) facilitates use of grease as a damping medium join two parts.
The foregoing objects of the invention are accomplished and the problems and shortcomings associated with prior art techniques and approaches are overcome by the present invention described in the present embodiment. Detailed descriptions of the preferred embodiment are provided herein; however, it is to be understood that the present invention may be embodied in various forms. Therefore, specific details disclosed herein are not to be interpreted as limiting, but rather as a basis for the claims and as a representative basis for teaching one skilled in the art to employ the present invention in virtually any appropriately detailed system, structure, or matter. The embodiments of the invention as described above and the methods disclosed herein will suggest further modification and alterations to those skilled in the art. Such further modifications and alterations may be made without departing from the spirit and scope of the invention.

,CLAIMS:1. A piston for grease damper (100) comprising
an outer tube (10),
a cylinder (20) concentrically fitted within the outer tube (10),
a piston having a piston rod (30) on one side and a piston head (40) on another side, linearly displaceable within the cylinder (20);
a first orifice (60A) and a second orifice (60A’) configured within the piston head (40), the first orifice (60A) and the second orifice (60A’) having hollow tubular structures with one end having larger diameter than the other end and connecting two plane surfaces of the piston head (40); and the first orifice (60A) and the second orifice (60A’) making a slanting angle with each other within the piston head (40); and
a piston guide (50) guiding the piston movement within the cylinder (20);
characterized in that, during an operation cycle, the first orifice (60A) and the second orifice (60A’) create a swivel effect to the grease getting extruded through the hole and provide velocity to the grease passing therethrough to impact the residual acting as a jet spray thereby causing disturbance vortex and restricting thereby the residual grease from getting caked or becoming solid.