JP2012180797A - Hermetic compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hermetic compressor having a low input, by preventing an increase of a frictional resistance between a holder and a lower race, which are caused by the total contact of a lower surface of the holder with an upper surface of the lower race, when stopping and starting operation using the holder worn out at the continuous operation.SOLUTION: In the hermetic compressor, a rib 164 is radially provided from an inner peripheral side 170 of the holder 154 toward an outer peripheral side 172, the rib for reinforcing the holder 154 at the lower surface of the holder 154 and for preventing the total contact of the holder 154 with the upper surface 159 of the lower race 158. By this arrangement, the total contact between the holder 154 and the lower race 158 is avoided at the start-up, so that the frictional resistance between the holder 154 and the lower race 158 is prevented from being increased to prevent the deterioration of strength due to wearing of the lower surface of the holder 154, thereby suppressing an increase of the input and improving the reliability.

Description

  The present invention relates to a hermetic compressor used in a refrigerator-freezer or the like.

  Conventionally, this type of hermetic compressor employs a thrust ball bearing between a shaft and a bearing for the purpose of improving efficiency to reduce sliding loss (for example, see Patent Document 1).

  Hereinafter, the conventional hermetic compressor will be described with reference to the drawings.

  FIG. 10 is a front sectional view of a conventional hermetic compressor described in Patent Document 1, FIG. 11 is an enlarged cross-sectional view of a main part during operation of the conventional hermetic compressor, and FIG. 12 is a conventional hermetic type. The principal part cross-sectional enlarged view at the time of operation stop after a long-time driving | running of a compressor is shown.

  10 to 12, the hermetic container 1 houses an electric element 2 and a compression element 4 that is rotationally driven by the electric element 2, and stores oil 6 at the bottom. The electric element 2 and the compression element 4 are assembled together and elastically supported in the sealed container 1 by a plurality of coil springs (not shown).

  The compression element 4 includes a shaft 16 having an eccentric shaft portion 14 formed via a main shaft portion 10 and a flange portion 12, a cylinder block 22 forming a compression chamber 20, and a shaft block provided in the cylinder block 22 to support the shaft 16. A bearing 26 that reciprocates in the compression chamber 20, a connecting rod 30 that connects the piston 28 and the eccentric shaft portion 14, a lower surface 31 of the flange portion 12, and an upper end surface 32 of the bearing 26. The thrust ball bearing 34 is provided to form a reciprocating compressor.

  One end of the shaft 16 is an oil supply mechanism 36 immersed in the oil 6 stored in the sealed container 1, and an oil supply groove 38 for supplying a part of the oil 6 pumped up to the main shaft portion 10 by the oil supply mechanism 36 to the upper end surface 32. have.

  The electric element 2 includes a stator 40 fixed below the cylinder block 22 and a rotor 42 fixed to the main shaft portion 10 by shrink fitting or the like.

  The thrust ball bearing 34 includes a plurality of balls 52 made of bearing steel such as SUJ2, a resin cage 54 that holds the balls 52, and an upper race 56 and a lower race 58 that are respectively disposed above and below the balls 52. have. The ball 52 is held in a ball storage unit 60 provided in the cage 54, and a small amount is provided between the ball 52 and the ball storage unit 60 so that the ball 52 can freely roll in the ball storage unit 60. A gap (not shown) is provided.

  The operation of the hermetic compressor configured as described above will be described below.

  When the electric element 2 is energized from an external power source (not shown), the rotor 42 rotates, and the shaft 16 rotates accordingly, and the movement of the eccentric shaft portion 14 is transferred to the piston 28 via the connecting rod 30. It is transmitted. Thereby, the piston 28 reciprocates in the compression chamber 20, and the compression element 4 performs a predetermined compression operation. At this time, the oil supply mechanism 36 of the shaft 16 pumps up the oil 6 and lubricates each sliding portion (not shown). A part of the oil supply mechanism 36 is supplied from the oil supply groove 38 to the upper end surface 32, and the thrust ball bearing 34 is installed. Lubricate.

  The thrust ball bearing 34 supports a vertically downward load due to the weight of the rotor 42 and the shaft 16 by a point contact with the ball 52, and generates a frictional force generated between the lower surface 31 of the flange portion 12 and the upper end surface 32 of the bearing 26. Reduce. This reduces the input of the hermetic compressor and improves efficiency.

JP 2005-127305 A

  However, in the above conventional configuration, since the ball 52 rotates while sliding in the ball storage portion 60 of the cage 54, the sliding time between the ball 52 and the ball storage portion 60 increases as the operation time becomes longer. The ball storage portion 60 is worn excessively, and the diameter of the ball storage portion 60 gradually increases.

  Even when the diameter of the ball storage section 60 is widened, during operation, both the cage 54 and the ball 52 rotate around the shaft 16, so that a large centrifugal force is generated in the ball 52 having a larger specific gravity than the cage 54, The ball 52 rotates while pressing the outer peripheral wall surface of the ball storage unit 60 outward by centrifugal force. Therefore, the cage 54 floats on the upper surface of the lower race 58 and rotates.

  However, since the diameter of the ball storage portion 60 increases as the operation time becomes longer, the retainer 54 cannot be held on a part of the surface of the ball 52 when the operation is stopped, as shown in FIG. It slips down to the upper surface of the lower race 58, and the lower surface of the retainer 54 and the entire upper surface of the lower race 58 come into contact uniformly.

  When oil remains on the upper surface of the lower race 58, the retainer 54 and the lower race 58 are in an adsorbing state due to the surface tension of the oil 6. When the hermetic compressor is started in this state, the cage 54 generates a centrifugal force on the ball 52, and the ball 52 pushes the outer peripheral wall of the ball storage portion 60 outward by the centrifugal force, and in this state, the cage It rotates while sliding with the lower race 58 until 54 floats on the upper surface 66 of the lower race 58. As a result, the friction resistance between the cage 54 and the lower race 58 is increased in the initial stage of startup, and the input is increased.

  Further, the conventional configuration has a problem that the retainer 54 and the lower race 58 slide each time the actuator is started, so that the lower surface of the retainer 54 is worn and the strength of the retainer 54 is deteriorated.

  In addition, there is a problem that the strength of the cage 54 is deteriorated because the operation time becomes long and the number of sliding times between the ball 52 and the ball storage unit 60 increases and the ball storage unit 60 wears.

  The present invention solves the above-described conventional problem. The diameter of the ball storage portion 60 is widened, and when the operation is stopped, the retainer 54 is caught on a part of the surface of the ball 52 and cannot be held, so that the upper surface of the lower race 58 is removed. Even if it slips down, it prevents full contact between the lower surface of the cage 54 and the upper surface of the lower race 58, prevents an increase in frictional resistance between the cage 54 and the lower race 58, and prevents wear on the lower surface of the cage 54. The purpose is to suppress the occurrence.

It is another object of the present invention to provide a highly durable hermetic compressor that prevents deterioration of the strength of the cage 54 even when the ball storage portion 60 is worn, maintains the rigidity of the cage 54, and has high durability.
An object of the present invention is to provide a highly efficient and highly reliable hermetic compressor that suppresses an increase in input.

  In order to solve the above-described conventional problems, the hermetic compressor of the present invention is provided with a rib that contacts the upper surface of the lower race on the lower surface of the cage, and the rib extends from the inner diameter of the cage to the outer diameter direction. Even if the ball storage part is worn out and the diameter of the ball storage part is widened, the contact avoidance mechanism provided on the holder can be used to The entire contact of the race can be prevented. As a result, an increase in frictional resistance between the cage and the lower race can be suppressed, and the strength of the cage can be prevented from being deteriorated due to wear on the lower surface of the cage. In addition, since the cage can be reinforced by the rib provided on the lower surface of the cage, the strength of the cage can be prevented from deteriorating even if the ball storage portion is worn with an increase in operating time.

  The hermetic compressor of the present invention can prevent the entire contact between the lower surface of the cage and the upper surface of the race at the time of activation by the rib provided on the cage. Therefore, it is possible to prevent an increase in frictional resistance due to the cage and the lower race, and to suppress an increase in input, and at the same time, the cage can be reinforced by the rib provided on the lower surface of the cage, thereby reducing the strength of the cage. It can prevent and improve durability.

Front sectional view of the hermetic compressor according to the first embodiment of the present invention. Cross-sectional enlarged view during operation of the thrust bearing that constitutes the hermetic compressor Plan view of the cage of the thrust bearing part constituting the hermetic compressor Sectional drawing by the AA line of FIG. 3 in the holder | retainer of the thrust bearing part which comprises the hermetic type compressor Cross-sectional enlarged view at the time of operation stop after long-time operation of the thrust bearing part constituting the hermetic compressor Sectional enlarged view at the time of operation | movement of the thrust bearing part which comprises the hermetic compressor in Embodiment 2 of this invention Plan view of the cage of the thrust bearing part constituting the hermetic compressor Sectional drawing by the BB line of FIG. 7 in the holder | retainer of the thrust bearing part which comprises the same hermetic compressor Cross-sectional enlarged view at the time of operation stop after long-time operation of the thrust bearing part constituting the hermetic compressor Front sectional view of a conventional hermetic compressor Cross-sectional enlarged view of the main part of a conventional hermetic compressor Cross-sectional enlarged view of the main part of a conventional hermetic compressor when the operation is stopped after a long operation

  According to a first aspect of the present invention, an oil, an electric element including a stator and a rotor, and a compression element driven by the electric element are accommodated in an airtight container, and the compression element includes a main shaft portion and the main shaft. Cylinder that forms a compression chamber, a flange that is formed at the tip of the shaft, a shaft that is formed through the flange and extends in the axial direction parallel to the axis of the main shaft, and a compression chamber A block, a bearing that is provided in the cylinder block and supports the shaft, a piston that reciprocates in the compression chamber, a connecting rod that connects the piston and the eccentric shaft portion, a flange portion, and the bearing A thrust bearing disposed between the upper end surface and the thrust bearing; a plurality of balls; a cage made of resin that holds the balls in a freely rolling manner; and the balls of An upper race and a lower race respectively disposed below; and further, the retainer is provided on the lower surface of the retainer, extends from the inner diameter of the retainer toward the outer diameter direction, and the upper surface of the lower race. Are provided with ribs for preventing the entire surface from contacting with each other.

By adopting such a configuration, even when the ball storage portion wears out and the diameter of the ball storage portion expands with long-term use, the contact avoidance mechanism provided in the retainer can be used to stop and start the operation. It is possible to prevent full contact between the cage and the lower race. As a result, it is possible to suppress an increase in frictional resistance due to contact between the cage and the lower race, and to suppress deterioration in strength of the cage due to wear, and an increase in input due to wear on the lower surface of the cage. And the reliability of the compressor can be improved. Even if the ball storage portion is worn, the cage is reinforced by the ribs provided on the lower surface of the cage, so that the strength of the cage can be prevented from deteriorating and the durability can be improved.

  According to a second invention, in the first invention, the rib is provided so as to extend in a radial direction.

  With this configuration, when oil is supplied between the cage and the lower race from the inside of the cage by the oil supply mechanism of the shaft, and when the oil scatters to the outer peripheral side of the cage and the lower race by centrifugal force , Do not shield the oil. As a result, since the oil is used for lubrication between the cage and the ball and between the lower race and the ball, the lubricity of the thrust bearing can be improved.

  According to a third invention, in the first invention, the rib is provided on the lower surface of the cage so as to be inclined at an acute angle from the inner circumference side toward the outer circumference side in the rotation direction of the cage.

  By adopting such a configuration, the rib of the cage causes the gas resistance with the refrigerant gas in the sealed container and the oil resistance with the oil remaining on the upper surface of the lower race surface to be perpendicular to the entire side surface of the rib during rotation. Therefore, gas resistance and oil resistance can be reduced, and an increase in compressor input can be suppressed.

  According to a fourth invention, in any one of the first to third inventions, the top end of the lower race on the rib has an R shape.

  By adopting such a configuration, when the ball storage portion of the cage is worn as the operation time is prolonged, the contact between the rib and the race at the time of operation stop and at the time of start can be made a line contact. . As a result, the frictional resistance between the cage and the lower race can be reduced, and an increase in the input of the compressor can be further suppressed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a front sectional view of a hermetic compressor according to the first embodiment of the present invention, and FIG. 2 is an enlarged cross-sectional view of the thrust bearing portion constituting the hermetic compressor according to the first embodiment during operation. 3 is a plan view of the retainer of the thrust bearing portion constituting the hermetic compressor, and FIG. 4 is a cross-sectional view taken along the line AA of FIG. 3 in the retainer of the thrust bearing portion constituting the hermetic compressor. FIG. 5 is an enlarged cross-sectional view of the thrust bearing portion constituting the hermetic compressor when the operation is stopped after a long time operation.

  1 to 5, an electric element 102 and a compression element 104 that is rotationally driven by the electric element 102 are housed and arranged in the sealed container 101, and oil 106 is stored in the inner bottom portion. The electric element 102 and the compression element 104 are assembled together and elastically supported in the sealed container 101 by a plurality of coil springs 108.

  Next, the main configuration of the compression element 104 will be described.

  In the shaft 110, a flange portion 114 is formed at the tip of the main shaft portion 112, and an eccentric shaft portion 116 extending in the axial direction parallel to the axis of the main shaft portion 112 is formed in the flange portion 114.

  The cylinder block 120 is casted, and a compression chamber 122 on the cylinder and a bearing 124 that supports the main shaft portion 112 of the shaft 110 in the vertical direction are formed. The piston 126 is fitted in the compression chamber 122 so as to reciprocate. The piston 126 and the eccentric shaft portion 116 are connected by a connecting rod 128.

  The thrust bearing 130 is disposed between the lower surface 132 of the flange portion 114 and the upper end surface 134 of the bearing 124 and receives a load acting mainly on the shaft 110 in the thrust direction (vertical downward direction).

  The shaft 110 has an oil supply mechanism 138 that is immersed in the oil 106 stored in the sealed container 101 at the lower end 136, and a part of the oil 106 pumped up by the oil supply mechanism 138 is transferred to the main shaft portion 112 at the upper end surface 134. It has the oil supply groove | channel 140 led to.

  The electric element 102 includes a stator 142 fixed below the cylinder block 120 and a rotor 144 fixed to the main shaft portion 112 by shrink fitting or the like.

  The thrust bearing 130 is generally referred to as a thrust ball bearing, and includes a plurality of balls 152 made of bearing steel such as SUJ2, a cage 154 formed of a resin such as nylon that holds the balls 152, and a ball 152. An upper race 156 and a lower race 158 are provided respectively above and below. The ball 152 is held in a ball storage unit 160 provided in the cage 154, and the ball 152 is so small that the ball 152 can freely roll in the ball storage unit 160 between the ball 152 and the ball storage unit 160. A gap (not shown) is provided. The ball 152 rolls while rotating in contact with the lower surface 157 of the upper race 156 and the upper surface 159 of the lower race 158.

  A rib 164 that reinforces the retainer 154 and prevents full contact between the lower surface 162 of the retainer 154 and the upper surface 159 of the lower race 158 is provided on the lower surface 162 of the retainer 154 on the inner peripheral side of the retainer 154. Four portions are uniformly formed radially from 170 toward the outer peripheral side 172.

  The rib 164 is formed with a rounded R shape 168 at the top 159 side of the lower race 158, and the height H of the rib 164 is D for the diameter of the ball 152 and T for the thickness of the cage 154. Then, the value calculated by the equation (H <D / 2−T / 2) is set, and it is possible to avoid the entire surface of the lower surface 162 of the cage 154 from contacting the upper surface 159 of the lower race 158 during operation. I am doing so.

  The operation and action of the hermetic compressor configured as described above will be described below.

  When the electric element 102 is energized from an external power source (not shown), the rotor 144 rotates, and the shaft 110 rotates accordingly, and the movement of the eccentric shaft portion 116 is transferred to the piston 126 via the connecting rod 128. It is transmitted. Accordingly, the piston 126 reciprocates in the compression chamber 122, and the compression element 104 performs a predetermined compression operation.

  At this time, the oil supply mechanism 138 of the shaft 110 pumps up the oil 106 and lubricates each sliding portion (not shown), and a part thereof is supplied from the oil supply groove 140 to the upper end surface 134 to lubricate the thrust bearing 130. To do.

The thrust bearing 130 supports a vertically downward load due to the weight of the rotor 144 and the crankshaft 110 in a point contact with the ball 152, and reduces the frictional force generated between the lower surface 132 of the flange portion 114 and the upper end surface 134 of the bearing 124. Let For this reason, the input of the hermetic compressor is reduced, and the efficiency is improved.

  When the continuous operation time of the hermetic compressor is increased, the number of sliding between the ball 152 and the ball storage unit 160 is excessively increased, the ball storage unit 160 is worn, and the diameter of the ball storage unit 160 gradually increases. .

  During operation, the cage 154 and the ball 152 both rotate around the shaft 110 even when the diameter of the ball storage portion 160 increases, so that a large centrifugal force is applied to the ball 152 having a larger specific gravity than the cage 154. It has occurred. Therefore, the ball 152 rotates while pressing the outer peripheral wall surface of the ball storage unit 60 outward by centrifugal force. In this state, the cage 154 floats on the upper surface 159 of the lower race 158 and rotates.

  When the operation is stopped, as shown in FIG. 5, the retainer 154 cannot be held on a part of the surface of the ball 152 due to the increased diameter of the ball storage portion 160, and the upper surface of the lower race 158. Slide down to 159.

  However, in the first embodiment, the rib 164 for preventing the entire contact between the lower surface 162 of the retainer 154 and the upper surface 159 of the lower race 158 is provided on the lower surface 162 of the retainer 154. The retainer 154 is in partial contact with the rib 164 on the upper surface 159 of the lower race 158 without being in full contact with the lower race 158, because the four locations are formed uniformly radially from the side 170 toward the outer peripheral side 172. Supported. Moreover, due to the R shape 168 of the tip 166 of the rib 164, the contact area is also a line contact.

  Therefore, even when the retainer 154 rotates on the upper surface 159 of the lower race 158 at the time of starting the compressor, the retainer 154 and the lower race 158 are not in full contact with each other, so that the frictional resistance can be kept small. As a result, it is possible to prevent the lower surface 162 of the retainer 154 from being worn and the strength of the retainer 154 from being deteriorated, and to realize a highly efficient and highly reliable hermetic compressor that suppresses an increase in input. be able to.

  Even if the ball storage portion 160 is worn and the strength of the cage 154 is deteriorated, the durability of the cage 154 can be improved because the cage 154 is reinforced by the ribs 164.

  Further, since the ribs 164 are formed radially on the lower surface 162 of the cage 154, the oil supply mechanism 138 of the shaft 110 scatters from the inside of the cage 154 between the cage 154 and the lower race 158 by centrifugal force. However, the supplied oil 106 is less likely to be blocked by the ribs 164 and is supplied to the balls 152. Therefore, the balls 152 rolling on the upper surface of the lower race 158 have improved lubrication and can further improve reliability.

  Further, even if the cage 154 is exposed to a high temperature state, the rib 164 serves as a cooling fin, and the temperature rise of the cage 154 can be prevented. As a result, the thermal strain of the cage 154 can be kept small, and the durability of the cage 154 can be improved.

  In the first embodiment, four ribs 164 are equally formed on the lower surface of the cage 154, but the same effect can be obtained if there are three or more. However, increasing the number of ribs 164 increases the strength of the cage 154, but increases the frictional resistance between the ribs 164 and the lower race 158, so it is preferable to reduce the number of ribs 164 as much as possible.

(Embodiment 2)
FIG. 6 is an enlarged cross-sectional view of the thrust bearing portion that constitutes the hermetic compressor according to the second embodiment of the present invention, and FIG. 7 is a plan view of the cage of the thrust bearing portion that constitutes the hermetic compressor. 8 is a cross-sectional view taken along line BB of FIG. 7 in the retainer of the thrust bearing portion constituting the hermetic compressor, and FIG. 9 is a long time of the thrust bearing portion constituting the hermetic compressor. It is an expanded sectional view at the time of operation stop after operation.

  In the second embodiment, since the configuration of the compressor excluding the thrust bearing portion is the same as the configuration of the compressor of the first embodiment, the configuration relating to the entire compressor is described in the first embodiment. FIG. 1 used in FIG. 1 and the description thereof are used, and the description thereof is omitted here.

  In the thrust bearing, the same components as those in the first embodiment will be described with the same reference numerals.

  6 to 9, the thrust bearing 230 is generally referred to as a thrust ball bearing, and is formed of a plurality of balls 152 made of bearing steel such as SUJ2 and a resin such as nylon that holds the balls 152. It has a cage 254 and an upper race 156 and a lower race 158 respectively disposed above and below the ball 152. The ball 152 is held in a ball storage unit 260 provided in the cage 254, and the ball 152 is so small that the ball 152 can freely roll in the ball storage unit 260 between the ball 152 and the ball storage unit 260. A gap (not shown) is provided. The ball 152 rolls while rotating in contact with the lower surface 157 of the upper race 156 and the upper surface 159 of the lower race 158.

  On the lower surface 262 of the retainer 254, ribs 264 that reinforce the retainer 254 and prevent the lower surface 262 of the retainer 254 and the upper surface 159 of the lower race 158 from contacting each other are spaced apart from each other at four locations. Are provided to be even. The rib 264 is formed to be inclined at an acute angle 274 from the inner peripheral side 270 toward the outer peripheral side 272 in the rotation direction 276 of the cage 254.

  In addition, the rib 264 is formed by a rounded R shape 268 at the tip 266 on the upper surface 259 side of the lower race 158, and the height H of the rib 264 is D for the diameter of the ball 252 and the thickness of the cage 254. Is defined by the equation (H <D / 2−T / 2) as in the first embodiment, and during operation, the entire lower surface 262 of the cage 254 is in the lower race during operation. Contact with the upper surface 159 of 158 can be avoided.

  The operation and action of the thrust bearing 230 configured as described above will be described below.

  If the continuous operation time of the hermetic compressor is increased, the number of sliding between the ball 152 and the ball storage unit 260 is excessively increased, the ball storage unit 260 is worn, and the diameter of the ball storage unit 260 gradually increases. .

  During operation, the cage 254 and the ball 152 both rotate about the shaft 110 even if the diameter of the ball storage portion 260 increases, so that a large centrifugal force is exerted on the ball 152 having a larger specific gravity than the cage 254. It has occurred. Therefore, the ball 152 rotates while pressing the outer peripheral wall surface of the ball storage portion 260 toward the outside with centrifugal force. In this state, the cage 254 floats on the upper surface 159 of the lower race 158 and rotates.

When the operation is stopped, as shown in FIG. 9, the retainer 254 cannot be held on a part of the surface of the ball 152 because the diameter of the ball storage portion 260 is widened, and the upper surface of the lower race 158 Slide down to 159.

  However, in the second embodiment, the retainer 254 is reinforced to the lower surface 262 of the retainer 254, and the lower surface 262 of the retainer 254 and the upper surface 159 of the lower race 158 are prevented from contacting each other. Since the rib 264 is provided, the retainer 254 is supported in a partially contacted state by the rib 268 on the upper surface 159 of the lower race 158 without contacting the entire surface of the lower race 158.

  Therefore, even when the retainer 254 rotates on the upper surface 159 of the lower race 158 at the time of starting the compressor, the frictional resistance can be suppressed to a low level, and the highly efficient and highly reliable sealed type with the increase in input suppressed. A compressor can be realized.

  Further, since four ribs 264 inclined at an acute angle 274 from the inner peripheral side 270 toward the outer peripheral side 272 are formed in the rotational direction 276 of the retainer 254 from the inner peripheral side 270 of the retainer 254. The strength in the width direction of the outer peripheral side 272 can be reinforced, and the strength of the cage 254 can be prevented from deteriorating.

  Further, since the rib 264 is inclined at an acute angle 274 in the rotation direction 276, the rib 264 has a gas resistance with the refrigerant gas (not shown) in the hermetic container 201 and the lower race 158 during the rotation of the cage 254. Since the oil resistance with the oil 106 remaining on the upper surface 159 is not received vertically on the entire side surface, gas resistance and oil resistance can be reduced. As a result, an increase in the input of the compressor can be suppressed and the efficiency can be further improved.

  Further, even when the cage 254 is exposed to a high temperature state, the rib 264 serves as a cooling fin, and the temperature rise of the cage 254 can be prevented. As a result, the thermal strain of the cage 254 can be kept small, and the durability of the cage 254 can be improved.

  In the second embodiment, the ribs 264 are equally formed at four places, but the same effect can be obtained if there are three or more places. However, increasing the number of ribs 264 increases the strength of the cage 254, but tends to increase the frictional resistance between the ribs 264 and the lower race 158. Therefore, it is preferable to reduce the number of ribs 264 as much as possible.

  As described above, since the hermetic compressor according to the present invention has a rib formed on the cage, the increase in input can be suppressed and the reliability can be improved, so a vending machine, a freezer showcase, a dehumidifier, etc. It can be applied to other uses.

DESCRIPTION OF SYMBOLS 101 Airtight container 102 Electric element 104 Compression element 106 Oil 110 Shaft 112 Main shaft part 114 Head part 116 Eccentric shaft part 120 Cylinder block 122 Compression chamber 124 Bearing 126 Piston 128 Connecting rod 130 Thrust bearing 134 Upper end surface 142 Stator 144 Rotor 152 Ball 154 Cage 156 Upper race 158 Lower race 159 Upper surface 162 Lower surface 164 Rib 166 Tip 168 R shape 170 Inner peripheral side 172 Outer peripheral side 230 Thrust bearing 254 Retainer 262 Lower surface 264 Rib 268 R shape 270 Inner peripheral side 272 Outer peripheral side

Claims (4)

An oil container, an electric element including a stator and a rotor, and a compression element driven by the electric element are accommodated in a sealed container, and the compression element is formed at a main shaft portion and a tip of the main shaft portion. A flange portion, a shaft that is formed through the flange portion and includes an eccentric shaft portion that extends in an axial direction parallel to the axial center of the main shaft portion, a cylinder block that forms a compression chamber, and the cylinder block And a bearing that supports the shaft; a piston that reciprocates in the compression chamber; a connecting rod that connects the piston and the eccentric shaft portion; and a flange portion and an upper end surface of the bearing. The thrust bearing is provided with a plurality of balls, a resin-made cage that holds the balls in a freely rolling manner in a ball housing portion, and upper and lower portions of the balls, respectively. The upper race is provided with an upper race and a lower race. Further, the retainer is extended from the inner diameter of the retainer to the outer diameter direction on the lower surface of the retainer, and the entire surface is in contact with the upper surface of the lower race. A hermetic compressor with ribs to prevent it. The hermetic compressor according to claim 1, wherein the rib is provided so as to extend in a radial direction. 2. The hermetic compressor according to claim 1, wherein the rib is provided on the lower surface of the cage so as to be inclined at an acute angle from the inner circumference side toward the outer circumference side in the rotation direction of the cage. The hermetic compressor according to any one of claims 1 to 3, wherein a top end of the lower race in the rib has an R shape.