Wear-preventive air-charger piston structure

Abstract

A wear-preventive air-charger piston structure is provided. The piston rod has a top forming a piston top seat on which a piston ring is disposed. The piston ring is covered with a top cover that is combined with the piston top seat. The top cover is provided with an airtight plate mounted thereto to form a complete piston structure. A buffering element is arranged between the piston top seat and the piston ring. The buffering element has an outside diameter smaller than the piston ring, so that when the piston ring, which is driven by a crankshaft to do an up-and-down movement, is put in an inclined oscillating condition and at a high position of an oscillation side, the buffering element functions to absorb the stress acting on the piston ring at the high position of the oscillation side to effectively prevent detachment and breaking of the piston ring.

Claims

1. A wear-preventive air-charger piston structure, the piston structure comprising a piston rod, a piston ring, and a top cover, the piston rod having a top that is formed with a piston top seat, the piston ring being disposed on the piston top seat, the piston top seat being covered with the top cover, such that the top cover and the piston top seat are securely fixed together, wherein the piston structure further comprises a buffering element, the buffering element being arranged between the piston top seat and the piston ring, the buffering element having an outside diameter that is smaller than an outside diameter of the piston ring, wherein when the piston ring is in an inclined oscillating condition and is at a high position of an oscillation side, the buffering element absorbs a stress applied to the piston ring at the high position of the oscillation side; wherein the buffering element is a plastic plate in the form of a hollow ring and has an inside surface in which a recess is formed, the recess forming a buffering space.

2. The wear-preventive air-charger piston structure according to claim 1, wherein the buffering element has a function of elastic restoration and has characteristics of resistance to heat and compression.

3. The wear-preventive air-charger piston structure according to claim 1, wherein the top cover and the piston top seat are fixed together by a plurality of pre-arranged fastener elements.

4. The wear-preventive air-charger piston structure according to claim 1, wherein the piston ring is in the form of a hollow structure having a bottom surface.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a perspective view showing a wear-preventive air-charger piston structure according to the present invention.

(2) FIG. 2 is an exploded view showing the wear-preventive air-charger piston structure according to the present invention.

(3) FIG. 3 is a side elevational view showing the wear-preventive air-charger piston structure according to the present invention.

(4) FIG. 4 is a cross-sectional view showing the wear-preventive air-charger piston structure according to the present invention.

(5) FIG. 5 is a schematic view showing a wear-preventive air-charger piston structure according to another embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

(6) For better understanding of the features and advantages of the present invention and to more clearly demonstrate the efficacy that can be achieved by the present invention, a detail description of the features and the advantages of the present invention will be provided below, with reference to the attached drawings. The aspect of the present invention will be expounded with reference to embodiment provided below, which, however, are not intended to impose constrains to the scope of the present invention in any respect.

(7) Referring first to FIGS. 1, 2, 3, and 4, the present invention discloses a wear-preventive air-charger piston structure. The piston structure 1 comprises a piston rod 2, a piston ring 3, and a top cover 211.

(8) The piston rod 2 has a top that is formed with a piston top seat 21, and the piston top seat 21 has a bottom that is provided with features including a plurality of air ingress holes and a plurality of locking holes. Such features are not novel parts of the present invention and no further details will be provided. Further, the piston rod 2 has a bottom that is provided with a feature for connection with a pre-arranged crankshaft, and such a feature is also not a novel part of the present invention and will not be further described herein.

(9) The piston ring 3 is made in a configuration of hollow structure having a bottom surface 31 and is disposed on a surface of the piston top seat 21 of the piston rod 2. The top surface of the piston top seat 21 is covered by the top cover 211. An airtight plate 4 is mounted to a surface of the top cover. The top cover 211 and the piston top seat 21 are securely fixed to each other by means of a plurality of pre-arranged fastener elements 6, so that the piston ring 3, and thus, the bottom surface 31 thereof, is securely fixed between the piston top seat 21 and the top cover 211.

(10) The piston structure 1 further comprises at least one buffering element 5. The buffering element 5 is characterized by having a function of elastic restoration or springing back (such as a plastic plate that is resistant to high temperature and compression). The buffering element 5 is in the form of a hollow ring configuration and has an outside diameter that is smaller than an outside diameter of the piston ring 3. The buffering element 5 is arranged between the piston top seat 21 of the piston rod 2 and the piston ring 3. Since the outside diameter of the buffering element 5 is smaller than the outside diameter of the piston ring 3, contact and abrasion of the buffering element 3 with an internal surface of a cylinder can be avoided.

(11) In an illustrative example of the present invention, when the piston ring 3 is in an inclined oscillating condition and is at a high position of an oscillation side, where the piston ring 3 is caused to involve increased abrading contact with an inside surface of a cylinder at the high position of the oscillation side, the buffering element 5 functions to absorb (buffer) a stress acting on the piston ring 3 at the high position of the oscillation side, achieving an effect of preventing detachment and breaking of the piston ring 3 resulting from over concentration of stress caused by an increased abrading contact point of the piston ring 3 with the inside surface of the cylinder at the high position of the oscillation side.

(12) Reference is now made to FIG. 5, another embodiment of the present invention is provided as an additional example, wherein the buffering element 5 is made in a form of a hollow annular configuration and having a function of elastic restoration or springing back (such as a plastic plate that is resistant to high temperature and compression). The buffering element 5 is provided with a recess 51 formed in an inside surface thereof, and the recess 51 functions to provide a buffering space, so that the buffering element 5 is provided with a function of minute elastic deformation. The recess 51 provided in the buffering element 5 makes it possible for better absorption (buffering) of the stress applied to the piston ring 3 at the high position of the oscillation side.