Lubrication – Systems – Rotary compressor
Reexamination Certificate
2000-03-17
2002-07-16
Kim, Chong H. (Department: 3682)
Lubrication
Systems
Rotary compressor
C384S123000, C384S292000, C384S305000
Reexamination Certificate
active
06419049
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a main shaft bearing lubricating apparatus for a sealing-type reciprocating compressor. More particularly, it relates to a main shaft bearing lubricating apparatus for a sealing-type reciprocating compressor that sufficiently provides a lubricating oil between a main shaft bearing and a thrust washer supporting a motor's rotor by preventing a metallic noise between the main shaft bearing and the rotor.
2. Discussion of Related Art
Compressors that are generally used in refrigerators, air conditioners, etc. are of sealing type in order to reduce noises. In such a compressor, as depicted in
FIG. 5
, a rotary shaft
102
is tightly fit into a motor's rotor
101
and turns as rotor
101
rotates. A connecting rod
103
is connected to rotary shaft
102
's lower end, and a piston rod
104
of a compression cylinder
105
is eccentrically connected to connecting rod
103
. Accordingly, as rotor
101
rotates by the rotation of the motor, the rotary shaft
102
rotates, and a piston rod
104
, connected to connecting rod
103
, reciprocates in response to the rotation of rotary shaft
102
, thereby making a piston head
106
reciprocate. As piston head
106
reciprocates, an evaporating refrigerant, introduced to compression cylinder
105
, is compressed and condensed. This sealing-type compressor's main shaft bearing
107
, supporting the motor's rotor
101
, is coupled to a block
108
via a bolt, etc., and an oil pickup
109
is joined to rotary shaft
102
's lower end, and transfers a lubricating oil, held in a lubricating oil storage shell (not shown), to various operating parts including compression cylinder
105
and finally to main shaft bearing
107
by centrifugal force produced by rotor
101
's turning. A thrust washer
110
is interposed between main shaft bearing
107
and rotor
101
, and rotates along with rotor
101
directly supporting rotor
101
's load. At least one straight lubricating groove
111
is formed on main shaft bearing
107
's upper surface that contacts thrust washer
110
, as shown in
FIGS. 6 and 7
, the groove
111
lying along a diameter of the bearing
107
.
The lubricating oil that is picked up by oil pickup
109
and reaches main shaft bearing
102
's upper surface flows to the outside of main shaft bearing
107
through lubricating grooves
111
by the centrifugal force of trust washer
110
. As depicted in
FIG. 6
, in the conventional compressor, since the lubricating oil, elevated through main shaft bearing
107
, flows to the outside of main shaft bearing
107
before it completely approaches a contact surface between main shaft bearing
107
's front section and thrust washer
110
, the lubricating oil does not exist between main shaft bearing
107
and trust washer
110
, and does not provide the fluid lubricating characteristics.
Since the load of rotor
101
supported by main shaft bearing
107
is transmitted vertically downward, it is transferred to the upper surface of main shaft bearing
107
through thrust washer
110
. That is, the weight of rotor
101
is sent to the upper surface of main shaft bearing
107
to cause friction. Since the lubricating oil is not sufficiently provided between main shaft bearing
107
's upper surface and thrust washer
110
's lower surface, a metallic friction is produced between main shaft bearing
107
and thrust washer
110
, thus generating a frictional loss and abnormal noise of high frequency, and deteriorating the compressor quality.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a main shaft bearing lubricating apparatus for a sealing-type reciprocating compressor which sufficiently provides a lubricating oil, transmitted to a main shaft bearing, to an upper surface of the main shaft bearing contacting a thrust washer, and makes a lubricating friction between the thrust washer and the main shaft bearing, thereby preventing a loss and abnormal noise due to a metallic friction.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described, the present invention provides a main shaft bearing lubricating apparatus for a sealing-type reciprocating compressor having a rotor provided to a rotary shaft and rotating about the rotary shaft with respect to a main shaft bearing with a thrust washer therebetween, and a reciprocating piston connected to one front end of the rotary shaft through a crank, including a plurality of lubricating grooves formed on the main shaft bearing's front section and each having an intake point and an outlet point that are disposed on different positions by a given angle with respect to the main shaft bearing's center of rotation. An outlet face of each of the lubricating grooves is smaller than an intake face in unit area.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.
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Burns Doane Swecker & Mathis L.L.P.
Kim Chong H.
Samsung Kwangju Electronics Co., Ltd.
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