Abstract
A divided-type piston of an air compressor, in which a piston rod
shaft is inserted into a center portion thereof and reciprocally moves
within a cylinder, has a piston body. The piston body is divided into
an upper piston, an intermediate piston and a lower piston, and these
pistons are integrally fixed and assembled by using a positioning
pin, provided that the upper piston and the lower piston are formed
with rider ring assembling grooves, and the intermediate piston is
formed with compression ring assembling grooves. The rider rings are
easily assembled to and disassembled from the piston, the time for
assembling and disassembling the rider rings is shortened, and the
components of the piston can be prevented from damage when the rides
rings are assembled and disassembled.
Claims
1. A divided-type piston of an air compressor, in which a piston rod
shaft is inserted into a center portion thereof and reciprocally moves
within a cylinder, characterized in that a piston body is divided
into an upper piston, an intermediate piston and a lower piston, and
these pistons are integrally fixed and assembled by using a positioning
pin, provided that the upper piston and the lower piston are formed
with rider ring assembling grooves, and the intermediate piston is
formed with compression ring assembling grooves.
Description
TECHNICAL FIELD
[0001] The present invention relates to a piston installed in an
air compressor, and more particularly to a divided-type piston of
an air compressor having a structure in which a rider ring is simply
assembled around and disassembled from the outer circumference thereof
so that time for disassembling the rider ring from the outer circumference
is shortened and the rider ring and the piston are prevented from
being damaged.
BACKGROUND ART
[0002] As widely known in the art, an air compressor is a mechanical
device for compressing air so as to increase pressure of the air,
and a reciprocating piston type compressor is widely used as a typical
example of the air compressor. A cylindrical piston installed in
the conventional reciprocating piston type compressor repeats reciprocal
movement within a cylinder so as to compress the air.
[0003] The conventional piston 102 in which a piston rod shaft
is inserted into a center shaft hole 101 as shown in FIG. 3 is integrated
with piston compression ring assembling grooves 105, formed on the
outer circumference thereof between rider ring assembling grooves
104, for guiding the reciprocating piston 102. The integrated Teflon
rider rings are assembled in the rider ring assembling grooves 104.
[0004] However, since, in order to assemble the rider rings in
the rider ring assembling grooves 104, the rider rings must be heated
and beaten to the positions of the rider ring assembling grooves
104 of the piston 102, the following problems are raised:
[0005] First, a lot time is required to heat the rider ring;
[0006] Since the rider ring must be heated and not directly touched
by flame of a torch when expanding the rider ring, it takes approximately
2 hours to assemble one rider ring on the piston.
[0007] Second, damage and deformation of the rider ring due to
the heat;
[0008] Since the heating of the rider ring is performed by hand,
there is the difference of elongation between the heated portion
and unheated portion of the rider ring, due to the local heating
of the rider ring. Since the heated rider ring must be beaten into
the rider ring assembling grooves by hammer, the rider ring may
be damaged. Moreover, since the rider ring is made of resin, the
property of the rider ring may be changed when it is heated to around
180.degree. C.
[0009] Third, the damage of the piston when disassembling the rider
ring;
[0010] Since the rider rings are assembled deeply within the rider
ring assembling grooves, and the rider rings are cut into two or
more pieces and disassembled from the divided-type piston by a sharp
tool such as a knife, the aluminum piston may be damaged.
DISCLOSURE
[Technical Problem]
[0011] Therefore, the present invention has been made in view of
the above problems, and it is an object of the present invention
to provide a divided-type piston in which a rider ring is easily
assembled to and disassembled from a piston so that time to assemble
and disassemble the rider ring is shortened and components of the
divided-type piston are prevented from damage.
[Technical Solution]
[0012] In accordance with an aspect of the present invention, the
above and other objects can be accomplished by the provision of
a divided-type piston of an air compressor, in which a piston rod
shaft is inserted into a center portion thereof and repeats reciprocal
movement within a cylinder, the piston including a piston body divided
into an upper piston, an intermediate piston, and a lower piston,
the upper piston and the lower piston being respectively formed
with rider ring assembling grooves, and the intermediate piston
being formed with compression ring assembling grooves, and positioning
pins for integrally fixing and assembling the upper piston, the
intermediate piston, and the lower piston with each other.
[Advantageous Effects]
[0013] According to the divided-type piston of an air compressor
of the present invention, the rider rings are easily assembled and
disassembled, the time for assembly and disassembly of the rider
rings can be shortened, and the rider rings and the piston can be
prevented from damage when assembling and disassembling the rider
rings.
DESCRIPTION OF THE DRAWINGS
[0014] The above and other objects, features and other advantages
of the present invention will be more clearly understood from the
following detailed description taken in conjunction with the accompanying
drawings, in which:
[0015] FIG. 1 is an exploded perspective view showing a structure
of divided-type piston according to the present invention;
[0016] FIG. 2 is a cross-sectional view of the assembled divided-type
piston shown in FIG. 1; and
[0017] FIG. 3 is a cross-sectional view of an assembled conventional
piston.
BEST MODE
MODE FOR INVENTION
[0018] Hereinafter, a divided-type piston according to the present
invention will be described in detail by reference to the accompanying
drawings.
[0019] FIGS. 1 and 2 are an exploded perspective view showing a
structure of divided-type piston and a cross-sectional view of the
assembled divided-type piston according to the present invention,
respectively.
[0020] A piston rod shaft 1 is inserted into a center portion of
a piston of an air compressor that reciprocally moves within a cylinder.
A piston body 2 is divided into an upper piston 2a, an intermediate
piston 2b, and a lower piston 2c, and these pistons are integrally
fixed and assembled by using a positioning pin 3, provided that
the upper and lower pistons 2a and 2c are respectively formed with
rider ring assembling grooves 4, and the intermediate piston 2b
is formed with compression ring assembling grooves 5.
[0021] Reference numeral 6 represents a washer, reference numerals
7a and 7b represent an upper step and a lower step respectively,
and reference numeral 8 represents a nut.
[0022] The rider rings are inserted into the rider ring assembling
grooves 4 by using the positioning pin 3, and the three-divided
pistons, i.e., the upper, intermediate, and lower pistons 2a, 2b,
and 2c are then assembled. The nut 8 is fastened on the end of the
piston rod shaft 1, and thus the piston is simply assembled. On
the contrary, the nut 8 is released from the end of the piston rod
shaft 1, and the positioning pin 3 is separated from the piston,
so that the rider rings can be easily disassembled from the piston.
INDUSTRIAL APPLICABILITY
[0023] As described above, according to the divided-type piston
of the present invention, the rider rings are easily assembled to
and disassembled from the piston, the time for assembly and disassembly
of the rider rings is shortened, and the rider rings and the piston
can be prevented from damage when assembling and disassembling the
rider rings.
[0024] Although the preferred embodiments of the present invention
have been disclosed for illustrative purposes, those skilled in
the art will appreciate that various modifications, additions and
substitutions are possible, without departing from the scope and
spirit of the invention as disclosed in the accompanying claims.
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