JP2001082336A - Reciprocating compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the occurrence of dislocation during assembly of a division rod, to facilitate assembly without a difficult work, such as matching the planes of a groove and a tip with each other, and to decide the geometric position of a connection part between the hole of a large end part and the piston of a small end part, in a reciprocating compressor used in a household refrigerator. SOLUTION: A large end part 76 is provided with a spherical dent 95 and a guide groove 96 formed in a large end hole 77 and a protrusion part 80. Since, at a small end part, one end of a rod part 81 has a connection part 73 with a piston 10 and the other end has a spherical part 97, simultaneously with insertion of the large end hole 77 into the eccentric part 11 of a crank shaft 7, the spherical dent 95 is simply inserted in the spherical body part 97 without a work like a plane matching work, and a situation that the large end part 76 drops downward and is horizontally dislocated is prevented from occurring, whereby an assembly work is extremely easy to make and a geometric position is also reliably decided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reciprocating compressor in a refrigerator such as a home refrigerator or a showcase.

[0002]

2. Description of the Related Art In recent years, various improvements have been made to hermetic electric compressors from the viewpoint of miniaturization and simplification of assembly. In addition, there are demands from the market for high efficiency, low noise, high reliability, low cost, and many aspects.

A conventional reciprocating compressor is disclosed in
There are those disclosed in JP-A-164174 and JP-B-5-84837.

A conventional reciprocating compressor disclosed in Japanese Patent Publication No. 5-84837 will be described below with reference to FIGS. 10, 11 and 12.

FIG. 10 is a longitudinal sectional view of a conventional reciprocating compressor, FIG. 11 is an enlarged view of FIG. 10, and an exploded view of a connecting rod and a piston before assembling the reciprocating compressor. FIG. It is an exploded top view of an end part and a small end part.

In FIGS. 10, 11 and 12, the motor / compressor unit 1 is supported in a housing 3 by a spring 2. The crankcase 4 serves as a support for mounting the stator 5 of the motor, and includes a bearing 6 for supporting a crankshaft 7 connecting the rotor 8 of the motor. Also, the crankcase 4
Is provided with a cylinder 9 in which a piston 10 reciprocates. An eccentric shaft 11 is provided at an upper end of the crankshaft 7. The cylinder 9 is provided with a valve plate 17 and a cylinder head 18, which can be manufactured by a known method, at the end of the cylinder and opposite the crankshaft 7. The connecting rod 19 has a small end 20 and a large end 30 and connects the piston 10 and the eccentric shaft 11 of the crankshaft 7.

The small end 20 of the connecting rod 19 comprises a small end hole 21 and a long first projection 22 extending radially from the small end hole 21. The first projection 22 is connected to the piston 10 by a piston pin 15. Have been.

The large end 30 of the connecting rod 19 is
3, a large end hole 31 having a short second protrusion 32 extending in the radial direction, and the large end hole 31 into which the eccentric shaft 11 of the crankshaft 7 is inserted.

The groove 33 of the large end hole 31 is
Opposing and parallel surfaces 34 formed inside the
And two internal second end faces 35 formed in a V-shape, and a vertical recess 36 is provided at the top of the second end face 35. A surface 24 and two V-shaped first end surfaces 25 are formed at the end 27 of the first protrusion 22.
The end surfaces 25 are configured to more reliably abut the second end surfaces 35 of the grooves 33, respectively.

The operation of the conventional reciprocating compressor constructed as described above will be described below.

With the crankshaft 7 inserted into the bearing 6 of the crankcase 4, the large end hole 31 of the large end 30 of the connecting rod 19 is inserted into the eccentric shaft 11, and the piston pin is inserted into the small end hole 21. By inserting 15, the piston 10 and the small end portion 20 connected to each other are inserted from the side of the cylinder 9 opposite the crankshaft.

Then, the end 27 of the first projection 22 of the small end 20 is fitted into the groove 33 of the second projection 32 of the large end 30, and the surface 24 and the first end surface 25 of the first projection 22 are fitted. And the surface 34 of the groove 33 of the first protrusion 32 and the second end surface 35 are respectively brought into contact with each other, pushed from the head side of the piston 10 and aligned up and down to form the geometrical shape of the large end hole 31 and the small end hole 21. It is fixed by welding or other method while maintaining its position.

The connecting rod 19, to which the large end 30 and the small end 20 are fixed, compresses the gas in the cylinder 9 by converting the rotation of the crankshaft 7 into reciprocating motion of the piston 10 and transmitting a force.

[0014]

However, in the above-mentioned conventional construction, the small end 20 and the large end 3 of the connecting rod 19 are not provided.
Since the joining of 0 is performed by fitting the end portion 27 and the groove 33, it may fall down or move in the horizontal direction at the time of assembling with respect to the piston movement surface direction (horizontal direction) or the vertical direction. However, there has been a problem that it is difficult to maintain the geometric positions of the large end hole 31 and the small end hole 21 and it is somewhat difficult to assemble them.

The present invention solves the conventional problems.
An object of the present invention is to provide a reciprocating compressor in which it is very easy to assemble without falling down or moving horizontally in assembling, and to ensure the geometrical position during assembling.

Further, since it is inserted into the end portion 27 and the groove 33 formed of a flat surface, it cannot be assembled unless the surfaces are exactly aligned, and it is difficult to assemble.

The present invention solves the conventional problems.
It is an object of the present invention to provide a reciprocating compressor in which there is no need to match planes at the time of assembling, assembly is extremely easy, and a geometrical position at the time of assembling can be reliably ensured.

In the above-described conventional configuration, the piston 10
The pressure received by the compression of the gas and the vibration generated by the movement of the piston 10 and the connecting rod 19 are
Large end portion 30 and small end portion 20
End face of the second end face of the groove 33 and the first end face 25 of the end portion 27
However, since it is impossible to ensure that some planes coincide with each other in terms of machining accuracy and securing a clearance at the time of connection, it is not possible to meet the plane near the recess 36 in the axial direction of the connecting rod 19. Concentrated force was applied to the edge and part of the surface, causing noise due to partial wear and local contact.

The present invention solves the conventional problems.
It is intended to reduce the generation of local pressure in the axial direction of the connecting rod, and to reduce local wear and local contact noise.

In addition, the above-mentioned conventional structure has a connecting rod 19.
Due to insufficient restraint between the horizontal and vertical components of the small end 20 and the large end 30 of the compressor, the compressor may come off when it is excessively overloaded, or it may vibrate or wear due to rattling. was there.

Another object of the present invention is to easily perform horizontal and vertical restraints at the time of assembling, so that even if an excessive load is applied to the compressor, the compressor does not come off and vibration and wear due to rattling are reduced. And a reciprocating compressor.

Further, since the end portion 27 and the groove 33 are in contact due to the alignment of the multiple surfaces, there is a problem in that even if any one of the surfaces is displaced, there is a possibility of occurrence of distortion during operation.

Another object of the present invention is to alleviate kinks during operation.

Furthermore, there has not been sufficient consideration of reliable fixing of the small end portion 20 and the large end portion 30 and improvement of reliability by material selection.

Another object of the present invention is to assemble without falling down or moving horizontally in manufacturing and assembling in consideration of reliable fixing, improvement of reliability of a sliding portion and improvement of manufacturability by material selection. And a more reliable reciprocating compressor is provided.

[0026]

In order to achieve this object, according to the present invention, a large end of a connecting rod has a pin hole penetrating in parallel with the large end hole, and a guide projecting vertically downward from the thickness of the pin hole. The large end hole has a projection in the radial direction of the large end hole, and the small end has a rod portion extending in the movement axis direction of the piston and an end of the rod portion, which projects from the rod portion and is perpendicular to the movement axis of the piston. The large end hole has an eccentric portion, the small end pin portion is inserted into the large end pin hole, and the large end guide portion contacts a part of the rod portion. Thus, the geometrical axis arrangement of the connection portion and the large end hole is maintained on the same plane.

This facilitates assembly without dropping down or moving in the horizontal direction, and eliminates horizontal dropout and improves reliability. Further, since the force acting in the axial direction of the connecting rod is received by the substantially cylindrical curved surface of the pin portion, the surface pressure is dispersed, the local pressure does not work, and local wear and local contact noise can be reduced.

The guide portion of the projection has a U-shaped contact surface which is open vertically downward with respect to the pin hole and has a tapered upper portion which is narrower at the upper portion and wider at the lower portion. An inclined surface that forms at least a part of the rod portion that comes into contact with the contact portion is formed so as to be inclined vertically upward and downward, and when the pin portion is inserted into the pin hole and the contact surface contacts the inclined surface at the same time, the contact surface is largely formed. The geometric axis arrangement of the end holes is maintained on the same plane.

As a result, it is easy to assemble without falling down or moving in the horizontal direction at the time of assembling, and it is possible to prevent horizontal drop-out and reduce the occurrence of vibration due to rattling.

Further, the projection has a projection, and the pin has a projection projecting from the upper surface of the projection when inserted into the pin hole, and the clamp comprises the projection, the projection and the rod. The large end and the small end of the connecting rod are tightly fixed by being held in contact with the bottom surface of the connecting rod.

As a result, it is easy to assemble without falling down or moving in the horizontal direction at the time of assembling, and it is possible to reduce looseness due to more secure attachment and improve reliability.

The large end of the connecting rod has a projection in the radial direction of the large end hole. The projection has a hemispherical spherical recess vertically upward and a guide groove communicating with the spherical recess. The small end portion has a radial portion of the hole, the small end portion has a rod portion extending in the direction of the movement axis of the piston, and at the end of the rod portion, at least vertically above the sphere, a sphere portion larger than the cross section of the rod portion, The large end hole is made eccentric, the small end sphere is inserted into the large end spherical recess, and a part of the rod is inserted into and touches the large end guide groove. The geometric axis arrangement of the end holes is maintained on the same plane.

As a result, it does not drop down and does not move in the horizontal direction, has good insertability, is extremely easy to assemble, and eliminates horizontal dropout. In addition, since the force acting in the axial direction of the connecting rod is received by the spherical portion and the hemispherical curved surface of the spherical depression, the surface pressure is dispersed, the local pressure does not work, and local wear and generation of local contact noise can be reduced.

Also, a slit groove is provided in a part of the rod part or the sphere part of the small end part, and a groove is also provided in a part of the projection part of the large end part, and the clamp is inserted into both the slit groove and the groove. By doing so, the small end and the large end are locked.

Thus, a reciprocating compressor can be provided which does not drop down, does not move in the horizontal direction, has good insertability, is extremely easy to assemble, does not drop off in the horizontal direction, and has less rattling.

The contact portion between the small end portion and the piston is a loose fitting connection by a ball holding portion formed on the inner surface of the piston and a ball portion provided at the end of the small end portion.

As a result, assembly is extremely easy,
A reciprocating compressor capable of reducing prying during operation can be provided.

The large end and the small end are made of different sliding materials.

As a result, the reliability can be improved by the selective combination of the sliding materials, and the manufacturing can be facilitated by the shape and material suitability.

[0040]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention reciprocates a connecting rod having a small end loosely connected to a piston at a connection portion and a large end hole connected to an eccentric portion of a crankshaft at a large end hole. In the compressor, the large end of the connecting rod has a pin hole penetrating in parallel with the large end hole, and a projection having a guide portion projecting vertically downward from the thickness of the pin hole in the radial direction of the large end hole. The small end has a rod extending in the direction of the movement axis of the piston, and a pin protruding from the rod at the end of the rod and perpendicular to the movement axis of the piston. The pin portion of the small end is inserted into the pin hole of the large end, and the guide portion of the large end comes into contact with a part of the rod portion. Are maintained on the same plane.

By inserting the large end into the large end hole from above the eccentric shaft and the pin, the pins can be inserted into the pin hole at the same time without any alignment between the planes. The insertion is completed by touching the part, and the vertical position is determined, and the geometric position of the connection part and the large end hole is accurately determined. Further, since the pin ends are inserted into the pin portions at the small end portion and the large end portion, they do not come off in the horizontal direction. Further, since the force acting in the axial direction of the connecting rod is received by the substantially cylindrical curved surface of the pin portion, the surface pressure is dispersed, the local pressure does not work, and local wear and local contact noise can be reduced.

As a result, assembly is easy, there is no horizontal dropout, local wear and local contact noise can be reduced, and reliability can be secured.

The guide portion of the projection has a U-shaped contact surface which is open vertically downward with respect to the pin hole and has a narrow upper portion and a wider lower taper. An inclined surface that forms at least a part of the rod portion that comes into contact with the contact portion is formed so as to be inclined vertically upward and downward, and when the pin portion is inserted into the pin hole and the contact surface contacts the inclined surface at the same time, the contact surface is largely formed. The geometric axis arrangement of the end holes is maintained on the same plane.

Since the guide portion has a U-shaped contact surface and the inclined surface of the opposing rod portion is tapered, it is easy to insert the guide portion into contact with a part of the rod portion, and the contact surface And the inclined surface are in contact with each other on the inclined surface, so that it is possible to reduce the occurrence of vibration due to rattling at the contact portion.

Thus, a reciprocating compressor can be provided which is easy to assemble without dropping down and does not move in the horizontal direction at the time of assembling, and in which horizontal vibrations and vibrations due to rattling are reduced.

Further, the projection has a projection, and the pin has a projection projecting from the upper surface of the projection when inserted into the pin hole, and the clamp comprises the projection, the projection and the rod. The large end and the small end of the connecting rod are tightly fixed by contacting and sandwiching the bottom surface of the connecting rod.

Since the clamp presses and makes contact with the protrusion of the pin, the protrusion of the protrusion, and the bottom surface of the rod, the insertion portions of the large end and the small end can be clamped in the up, down, front and rear directions. As a result, the large end portion and the small end portion are more securely fixed.

As a result, it is easy to assemble without dropping down or moving in the horizontal direction at the time of assembling, and rattling can be reduced, so that reliability can be improved by more secure fixing.

A reciprocating compressor having a connecting rod having a small end loosely connected to a piston at a connection portion and a large end connected to an eccentric portion of a crankshaft at a large end hole, The large end of the connecting rod has a projection in the radial direction of the large end hole, and the projection has a hemispherical spherical depression vertically upward,
A guide groove communicating with the spherical recess is provided in the radial direction of the large end hole, and the small end has a rod portion extending in the movement axis direction of the piston. Has a spherical part larger than the cross-section of the large end hole and the eccentric part, the spherical part of the small end is inserted into the spherical recess of the large end,
Further, a part of the rod portion is inserted into and comes into contact with the guide groove at the large end, whereby the geometrical axis arrangement of the connection portion and the large end hole is maintained on the same plane.

The large end hole of the large end is inserted into the eccentric shaft from above the eccentric shaft and the sphere vertically, and at the same time the sphere is inserted into the spherical recess and a part of the rod contacts the guide groove. Assembly is easy. In addition, since the insertion of the spherical concave portion into the spherical portion is started by inserting the spherical portion into the substantially cylindrical portion of the spherical portion, it is possible to insert the spherical portion very easily from the tip without aligning the planes. Further, since the spherical portion is larger than the cross section of the rod portion, it does not come off in the horizontal direction. Further, since the force acting in the axial direction of the connecting rod is received by the spherical portion and the hemispherical curved surface of the spherical depression, the surface pressure is dispersed, and the local pressure does not work, so that local wear and generation of local contact noise can be reduced.
Further, the geometrical positions of the connecting portion and the large end hole are determined at the time of insertion.

Thus, it is possible to provide a reciprocating compressor that is extremely easy to assemble, does not come off in the horizontal direction, and reduces local wear and generation of local contact noise.

Further, a slit groove is provided in a part of the rod part or the sphere part of the small end part, and a groove is also provided in a part of the projection part of the large end part, and the clamp is inserted into both the slit groove and the groove. By doing so, the small end and the large end are locked.

The clamp can be easily inserted into the slit groove of the rod or the spherical body and the groove of the projection at the large end. In addition, since the spherical part is pressed with a clamp from the opposite curved surface side, there is no specific surface where the pressing force is applied in all directions of the curved surface, so the rattling between the large end and the rod part is reduced by locking with the clamp You can do it.

As a result, it is possible to provide a reciprocating compressor which is extremely easy to assemble and has reduced horizontal detachment and rattling.

Further, the connecting portion between the small end and the piston is a loose fitting connection by a ball holding portion formed on the inner surface of the piston and a ball provided at the end of the small end.

The connecting portion is a loose fitting connection between the ball holding portion and the ball portion, and there is a slight movement in the vertical and horizontal directions. Even if there is contact between the members at the time of insertion of the members, the rod portion can be inserted while slightly moving, so that the assembly becomes very easy. Further, since the connecting portion has a rotational degree of freedom of the rod portion in the axial direction, the twisting caused by the operation is absorbed by the rotational degree of freedom.

This makes assembly extremely easy,
A reciprocating compressor capable of reducing prying during operation can be provided.

The large end and the small end are made of different sliding materials.

Then, a material suitable for each of the large end and the small end can be appropriately selected from both the sliding characteristics and the manufacturing method.

As a result, the reliability can be improved by the selective combination of the sliding members, and the manufacturing can be facilitated by the shape and material suitability.

[0061]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a hermetic electric compressor according to the present invention will be described below with reference to the drawings. The same components as those in the related art are denoted by the same reference numerals, and detailed description thereof is omitted.

(Embodiment 1) FIG. 1 is a vertical sectional view of a reciprocating compressor according to Embodiment 1 of the present invention. FIG. 2 is an enlarged view of FIG. 1, showing an exploded view of a connecting rod and a piston before assembling a reciprocating compressor, and FIG. 3 is a view in which a plan view and a longitudinal sectional view before assembling the connecting rod of FIG. .

In FIG. 1, reference numeral 71 denotes a connecting rod, and one end of a small end 72 is loosely connected to the piston 10 by a piston pin 75 loosely fitted in a small end hole 74 at a connecting portion 73.
The other end is connected to the eccentric shaft 11 of the crankshaft 7 by a large end hole 77 of the large end 76.

In FIG. 2, the piston 10, the piston pin 75, and the small end 72 are inserted from the side of the cylinder 9 opposite the crankshaft 7, and the large end 76 of the connecting rod 71 is connected to the eccentric shaft 11 of the crankshaft 7. It is inserted from above vertically.

The large end 76 of the connecting rod 71 is
7 is a large-end hole 7 having a pin hole 78 drilled in parallel with 7 and a guide portion 79 projecting vertically downward from the pin hole 78.
7 in the radial direction. The guide portion 79 only needs to be able to partially contact the rod portion 81, but may have a structure in which the rod portion is partially sandwiched.

The small end portion 72 has a rod portion 81 perpendicular to the small end hole 74 extending in the radial direction of the small end hole 74, and a pin portion 82 at the tip thereof is perpendicular to the movement direction of the piston 10. Is provided. That is, the pin portion 82 is formed in parallel with the small end hole 74.

The pin portion 82 may be formed so as to have a slight gap with the pin hole 78, or may be formed to have a dimension which can be press-fitted and fixed by a taper or a partial projection.

In FIG. 3, reference numeral 83 denotes an upper surface of the rod portion 81, and reference numeral 84 denotes an insertion end of the pin portion. A lower surface 85 is a vertically lower portion of the pin hole 78.

The pin portion 82 is more easily inserted if it is chamfered so that the upper surface 81 is smaller than the pin hole 78.

The operation of the above configuration will be described below. The small end portion 72 loosely connected to the piston 10 at the connection portion 73 is inserted into the cylinder 9 from the side opposite to the crankshaft 7, and the pin portion 82 at the tip of the rod portion 81 is inserted into the insertion surface 8.
4 vertically up close to the eccentric portion 11 of the crankshaft 7;
Place in parallel.

The pin hole 78 provided in the projection 80 of the large end 76 is inserted into the large end hole 77 of the large end 76 from above the eccentric shaft 11 and the pin vertically. 7
2 from the insertion end 84 side. Since the insertion is performed in the hole, the planes do not need to be exactly aligned with each other. If the pin portion 82 is slightly inserted into the pin hole 78, it does not come off in the horizontal direction. The insertion of the large end portion 76 is completed when the rod portion 81 contacts the lower surface 85 of the pin hole 78 and the guide portion 79 contacts a part of the rod portion, and the small end hole 74 and the large end hole 77 are simultaneously inserted. Is determined. With a very simple insertion operation, the small end portion 72 and the large end portion 76 do not come off in the direction of movement of the piston 10, that is, the horizontal direction, and the geometric positions of the connection portion 73 and the large end hole 77 are accurately determined.

The force acting in the axial direction of the rod portion 81 of the connecting rod 71 due to the compression and suction movement of the piston 10 is applied to the substantially cylindrical curved surfaces of the pin portion 82 and the pin hole 78, so that the surface pressure is dispersed, and the local pressure is reduced. Does not work, and local wear and local contact noise can be reduced.

Further, when the insertion of the pin hole 78 and the pin portion 82 is completed, the small end portion 72 and the large end portion 76 do not move in the horizontal direction and do not fall down. 82 and the pin hole 78 are press-fitted and fixed.
The work of fixing more securely by welding a part of the rod 9 and the rod 81 can also be easily performed.

As described above, the reciprocating compressor of this embodiment is
Small end 72 loosely connected to piston 10 at connection 73
And a connecting rod 71 having a large end portion 76 connected to the eccentric portion 11 of the crankshaft 7 with a large end hole 77, wherein the large end portion 72 of the connecting rod 71 penetrates in parallel with the large end hole 74. 78 and a projection 80 having a guide portion 79 projecting vertically downward from the thickness of the pin hole 78 in the radial direction of the large end hole 77, and the small end 72 extends in the movement axis direction of the piston 10. A rod portion 81 and a pin portion 82 protruding from the rod portion 81 and perpendicular to the axis of movement of the piston 10 are provided at the end of the rod portion 81, and the large end hole 77 is used as the eccentric portion 11,
6 is inserted into the pin portion 82 of the small end portion 72,
Further, since the guide portion 79 of the large end 76 contacts a part of the rod portion 81, the geometrical axis arrangement of the small end 72 and the large end hole 77 is maintained on the same plane. The large end hole 77 of the end 76 is inserted into the eccentric part 11 of the crankshaft 7 and the pin hole 78 provided in the projection 80 of the large end 76 is inserted into the pin 82 of the small end 72 at the insertion end 84 side. The small end portion 72 and the large end portion 76 do not fall down in the direction of movement of the piston 10, that is, the horizontal direction or the large end portion 76, and the connecting portion 73 The geometrical position of the large end hole 77 is also accurately determined, and the assembling is easy and the working efficiency is improved. Further, the accuracy of the geometrical position is easily and reliably secured, and the reliability is improved because there is no horizontal displacement.

Further, the force acting in the axial direction of the rod portion 81 of the connecting rod 71 due to the compression and suction movement of the piston 10 is applied to the substantially cylindrical curved surfaces of the pin portion 82 and the pin hole 78, so that the surface pressure is dispersed, and the local pressure is reduced. Does not work, and local wear and local contact noise can be reduced.

In this embodiment, the piston 10 and the small end 72 are loosely connected to each other at the connecting portion 73 by the piston pin 75 inserted into the small end hole 74. As another method of loosely fitting, the connection portion 73 may be configured by a ball provided on the small end portion 73 and a ball receiver provided on the piston 10.

(Embodiment 2) FIG. 4 is an assembled perspective view of a main part of a reciprocating compressor according to Embodiment 2 of the present invention.

In FIG. 4, reference numeral 71 denotes a connecting rod, which comprises a small end 72 and a large end 76. A pin hole 78 is formed in the projection 80 of the large end 76 in parallel with the large end hole 77, and a guide 79 is provided on the side of the projection 80 opposite to the large end hole 77. The guide portion 79 includes an upper portion 86
Are narrow, the lower part 87 is open in a downwardly U-shape with a wide taper, and the inside is a contact surface 88.

One end of the small end 72 has a connecting portion 73 and the other end has a pin 82 via a rod 81. Pin part 8
At least a portion of the rod portion 81 that faces the contact surface 88 of the guide portion 79 when the second member 2 is inserted into the projection portion 80 is formed with an inclined surface 89 inclined downward from vertically upward.

The operation of the above configuration will be described below. When the pin hole 78 of the large end portion 76 is inserted into the pin portion 82 of the small end portion 72, the guide portion 79 moves to the lower portion 87.
From above, and over the inclined surface 89 of the rod portion 81, and the inclined surface 89 and the contact surface 80 of the guide portion 79 come into contact with each other, so that there is almost no backlash and the connection is made. The pin portion 82 has a pin hole 78
The rod 81 has little rattling in the axial direction, and the inclined surface 89 and the contact surface 88 have almost no rattling or deflection in the direction perpendicular to the axis of the rod 81. Contact portion 7 between hole 77 and small end portion 72
3 and the small end 72 and the large end 76
There is almost no rattling.

As described above, the reciprocating compressor of this embodiment is
The guide portion 79 of the protrusion 80 has a U-shaped contact surface 88 in which an upper portion 86 opened vertically downward with respect to the pin hole 78 is narrow and a lower portion 87 is tapered widely.
At least a portion of the rod portion 81 that is in contact with the contact surface 9 is formed to be inclined downward from vertically upward, and the contact portion 88 is simultaneously inserted into the pin hole 78 when the pin portion 82 is inserted. Since the geometric axis arrangement of the connection portion 73 and the large end hole 77 is maintained on the same plane by contacting the contact portion 89, the pin portion 82 can be easily inserted into the pin hole 78 by the simple operation of inserting the rod 81. There is almost no backlash in the axial direction,
Due to the joining of the inclined surface 89 and the contact surface 88, the rod 81 rattles in the direction perpendicular to the axis, almost no vibration occurs, and the large end hole 7
The geometrical position of the connecting portion 73 between the small end portion 7 and the small end portion 72 is determined, and rattling between the small end portion 72 and the large end portion 76 is almost eliminated. Therefore, the large end portion 76 and the small end portion 72 do not come off, the occurrence of vibration due to rattling is reduced, and a stable connecting rod behavior can be obtained.

(Embodiment 3) FIG. 5 is an assembled perspective view of a connecting rod of a reciprocating compressor according to Embodiment 3 of the present invention.

In FIG. 5, reference numeral 71 denotes a connecting rod, which is composed of a small end 72 and a large end 76. The projection 80 of the large end 76 has a projection 90, and the projection 8 of the large end 76.
The pin portion 82 inserted into the pin hole 78 of the
The protrusion 93 protrudes from the upper surface 91 to the same side as the protrusion 90, and the clamp 93 is formed in a U-shape. The width of the U-shape is the same as the upper surface 91 of the protrusion 92 and the rod portion. The wire diameter is almost equal to the width of the bottom surface 94 of the projection 81 and the projection 92 and the projection 90
Is slightly smaller than the minimum part of the gap formed by Although a steel wire is easy to use for the clamp 93, a plate-shaped one may be used.

The operation of the above configuration will be described below. When the pin portion 82 of the small end portion 72 is inserted into the pin hole 78 of the large end portion 76, the pin portion 82 protrudes from the upper surface portion 91 of the protrusion 80, and the protruding portion is the protrusion 92. The clamp 93 is pushed between the protruding portion 92 and the convex portion 90 so as to contact each other, and at the same time, also presses and contacts a part of the bottom surface 94 of the rod portion 81.

Thus, the small end 72 and the large end 76 are
The rod portion 81 is also securely fixed in the vertical direction in the axial direction, so that there is no play.

As described above, the reciprocating compressor of this embodiment is
The projection 80 has a projection 90, and the pin 82 is
8 has a protrusion 92 protruding from the upper surface 91 of the protrusion 80, and the clamp 93 comes into contact with the protrusion 90, the protrusion 92, and the bottom surface 94 of the rod portion 81, and , Large end 76 and small end 7 of connecting rod 71
2, the small end 72 and the large end 76 can be easily and more securely fixed to each other.
3 presses the pin portion 78, the convex portion 90, and the bottom surface 94, so that there is almost no rattling of the clamp 9 itself and rattling of the large end portion 76 and the small end portion 72, and vibration due to rattling. Occurrence is also reduced, and high reliability can be obtained with more secure adhesion.

(Embodiment 4) FIG. 6 is an exploded view of a connecting rod and a piston before assembling a reciprocating compressor according to Embodiment 4 of the present invention, and FIG. 7 is a small end and a large part before assembling the connecting rod of FIG. It is an assembly perspective view of an end part.

6 and 7, the piston 10, the piston pin 75 and the small end 72 are inserted from the side opposite to the crankshaft 7 of the cylinder 9, and the large end is perpendicular to the eccentric shaft 11 of the crankshaft 7. It is inserted from above.

The large end portion 76 has a projection 80 in the radial direction of the large end hole 77. The projection 80 has a hemispherical spherical recess 95 vertically above and a guide groove communicating with the spherical recess 95. 96
Is provided.

The guide groove 96 only needs to be capable of partially contacting the rod portion 81, but may have a structure in which the rod portion 81 is partially sandwiched.

The small end portion 72 has a rod portion 81 perpendicular to the small end hole 74 extending in the radial direction of the small end portion 72, and has a spherical spherical portion 97 at the tip. Spherical part 97
The upper half may be spherical and the lower half cylindrical. The rod section 81 has a smaller cross section than the spherical section.

The operation of the above configuration will be described below. The small end 72 loosely connected to the piston 10 at the connecting portion 73 is inserted into the cylinder 9 from the side opposite the crankshaft 7, and the spherical portion 97 at the tip of the rod portion 81 is connected to the eccentric portion 11 of the crankshaft 7. Place in close proximity.

Then, the eccentric shaft 11 and the spherical body 97 are inserted into the large end hole 77 of the large end 76 from above, and
The spherical portion 97 of the small end portion 72 is inserted into the spherical concave portion 95 provided in the projection portion 80 of the large end portion 76, and the spherical surface of the spherical concave portion 95 comes into contact with the spherical surface above the spherical portion 97 to complete the insertion. , A part of the rod portion 81 contacts a part of the guide groove 96. As a result, the geometrical positions of the small end hole 74 and the large end hole 77 are determined, and the small end portion 72 and the large end portion 76 can be easily inserted, and the spherical portion 97 is larger than the cross section of the rod portion 81. The geometrical positions of the connection portion 73 and the large end hole 77 are reliably determined without the piston 10 falling out in the movement direction, that is, the horizontal direction, and the projection 80 does not fall downward.

Further, since the spherical portion 97 has a spherical upper portion, the insertion into the spherical recess 95 is a process of inserting the sphere into a substantially cylindrical tube. In addition, the insertion is extremely easy, the assembly work can be automated, and the manufacturing cost can be greatly reduced.

Further, the force acting in the axial direction of the rod portion 81 of the connecting rod 71 due to the compression and suction movement of the piston 10 is received by the spherical portion 97 and the hemispherical curved surface of the spherical depression, so that the surface pressure is dispersed, and the local pressure is reduced. It does not work, and local wear and local contact noise can be reduced.

Further, the guide groove 96 and the rod 81 can be more securely fixed by welding a part of the rod portion 81, or by caulking and fixing the guide groove 81 and the rod 81.

As described above, the reciprocating compressor of this embodiment is
Small end 72 loosely connected to piston 10 at connection 73
And a reciprocating compressor having a connecting rod 71 having a large end 76 connected to the eccentric portion 11 of the crankshaft 7 with a large end hole 77, wherein the large end 76 of the connecting rod 71 In the radial direction of the large end hole 77, the protrusion 80
A hemispherical spherical recess 95 vertically above and a guide groove 96 communicating with the spherical recess 95 are provided in the radial direction of the large end hole 77, and the small end 72 has a rod portion 81 extending in the movement axis direction of the piston 10. , At the end of the rod portion 81, at least a sphere is formed vertically above the cross section of the rod portion 81, the large end hole 77 is formed as the eccentric portion 11, and the small end is formed in the spherical recess 95 of the large end portion 76. The spherical portion 97 of the end portion 72 is inserted, and a part of the rod portion 81 is further inserted into the guide groove 96 of the large end portion 76.
Since the geometrical axis arrangement of the connecting portion 73 and the large end hole 77 is maintained on the same plane by contact, the large end hole 77 of the large end portion 76 is connected to the eccentric portion 11 of the crankshaft 7. At the same time, the one spherical portion 97 of the small end portion 72 is inserted into the spherical recess 95 provided in the projection portion 80 of the large end portion 76 by a very simple and easy operation. 96, the small end 72 does not come off in the direction of movement of the piston 10, that is, in the horizontal direction, and the geometric positions of the connection portion 73 and the large end hole 77 are determined, so that assembly is easy and work efficiency is improved. In addition, it is easy and reliable to ensure the accuracy of the geometrical position, there is no dropout in the horizontal direction, and the spherical portion 97 and the spherical recess 9 are provided.
Since the spherical surfaces of No. 5 are in contact with each other, there is no backlash due to the displacement between the surfaces which occurs between the multiple planes, so that the reliability is improved. Further, since the portion into which the spherical portion 97 is inserted is a spherical surface, the workability of the insertion into the spherical concave portion 95 is extremely good, and the automatic assembly can be easily performed, and the manufacturing cost can be greatly reduced by the automatic assembly.

Further, the force acting in the axial direction of the rod portion 81 of the connecting rod 71 due to the compression and suction movement of the piston 10 is received by the spherical portion 97 and the hemispherical curved surface of the spherical depression, so that the surface pressure is dispersed, and the local pressure is reduced. It does not work, and local wear and local contact noise can be reduced.

(Embodiment 5) FIG. 8 is an assembled perspective view of a small end and a large end when assembling a connecting rod of a reciprocating compressor according to Embodiment 5 of the present invention.

In FIG. 8, a slit groove 98 is provided vertically below the rod portion 81 of the small end portion 72 whose one end is loosely connected to a piston (not shown) at the connection portion 73.
1 is provided at an appropriate depth substantially perpendicular to the axial direction,
A groove 99 is provided at an appropriate depth at a position opposite to the slit groove 98 on the projection 80 of the large end 76 which is loosely connected to the eccentric shaft (not shown) through the large end hole 77. .

A clamp 100 is provided so that when the spherical portion 97 is inserted into the spherical recess 95 of the large end 76, the slit portion 98 and the groove 99 can be held therebetween.

The operation of the above configuration will be described below. The large end portion 76 and the small end portion 72 are formed by inserting the rod portion 81 of the small end portion 72 and the spherical portion 97 of the tip into the guide groove 96 and the spherical recess 95 of the projection 80 of the large end portion 76, respectively. The geometrical axis arrangement of the connection portion 73 and the large end hole 77 is maintained on the same plane, and the clamp 100 is inserted into the groove 99 and the slit groove while pressing them both vertically from the lateral direction, thereby allowing the rod portion 98 to be inserted. The projection 80, that is, the small end 7
2 and the large end 76 are more securely fixed.

Since the clamp 100 presses the spherical body portion 97 inside the spherical recess 95, the pressing force is
It is applied to all directions of the curved surface and does not rattle due to slight displacement of a certain surface such as contact using a multi-plane, and the rattling between the large end portion 76 and the rod portion 81 can be reduced.

Further, it is very easy to secure the geometrical axis arrangement of the contact portion 73 and the large end hole 77, and to fix the small end portion 72 and the large end portion 76 easily. If it is necessary to reassemble, it can be easily removed. Therefore, the production cost can be greatly reduced because the work process is easy and no parts are lost.

As described above, the reciprocating compressor of this embodiment is
The small end 72 has a slit groove 98 in a part of the rod portion 81 or the sphere diagram 97, and the large end 76 also has a groove 99 in a part of the projection 80. 99, the small end 72 and the large end 76
, It is very easy to secure the geometrical axis arrangement of the connecting portion 73 and the large end hole 77 and to fix the small end portion 72 to the large end portion 76. There is no omission and rattling can be reduced. In addition, since it can be easily removed and inserted, it can be easily removed even if it is necessary to reassemble in the process, the assembly work is very easy, no loss of parts occurs, and the production cost can be reduced. .

(Embodiment 6) FIG. 9 is an assembled perspective view of a small end and a large end before assembling a connecting rod of a reciprocating compressor according to Embodiment 5 of the present invention.

In FIG. 9, the connecting portion 73 is connected to the piston 1
A so-called ball joint connection in which a ball portion 102 formed at one end of the rod portion 81 of the small end portion 72 is loosely fitted and connected to a ball holding portion 101 formed inside the inner portion 0 by loosely fitting and holding. The large end 76 is formed by the large end hole 77 and the eccentric portion 11.
The projection 80 of the large end portion 76 that is loosely connected to the projection has a spherical recess 95 and a guide groove 96.

In the small end portion, the connecting portion 73 side of the piston 10 is a spherical ball portion 102, and the other end is a spherical portion 97 via a rod portion 81.

The operation of the above configuration will be described below. At the same time when the large end hole 77 of the large end 76 is inserted into the eccentric shaft 11, the sphere part of the small end 72 and a part of the rod part 81 are inserted into the spherical recess 95 and the guide groove 96, respectively. The geometric positions of 77 and the connecting portion 73 are determined. At this time,
The connecting portion 73 is a so-called ball joint connection in which the ball portion 102 formed at one end of the rod portion 81 of the small end portion 72 is loosely fitted and connected to the ball holding portion 101, so that the movement of the piston 10 It has some degree of rotational freedom around the axis. Therefore, when inserting the rod portion 81 and the sphere portion 97 into the spherical recess 95 and the guide groove 96, the rod can be inserted while slightly moving the position of the rod in the vertical and horizontal directions. Easy to assemble because there is no difficulty in just fitting just by moving,
Even if contact between members occurs at the time of assembling, it can be avoided by a slight movement, and assembling becomes very easy.

Further, as in this embodiment, the clamp 10
0, a circular portion is formed to receive and hold the spherical portion 97. When the rod portion 81 is inserted into the guide groove 96, the rod portion 81 has a rotational degree of freedom. While the geometric positions of the large end hole 77 and the connecting portion 73 can be fixed, even if the prying due to the reciprocating motion of the piston 10 during operation occurs in the rod portion 81, it is mitigated by the minute rotational freedom of the rod portion 81. And smooth operation is obtained.

Further, the assembling of the connecting portion 73, the spherical portion 97 and the spherical concave portion 95 can be performed with a slight degree of freedom at the time of assembling. However, the geometric positions of the large end hole 77 and the connecting portion 73 are accurately determined, and the movement direction of the piston. (The axial direction of the rod portion 81) can be easily assembled without slipping off, the assembling work is very easy, no parts are lost, and the production cost can be greatly reduced.

Further, each of the ball portion 102 and the ball portion 97 of the rod portion 81 is a sphere having the same diameter.
When the rod 81 is also symmetrical at the center of the shaft, one end of the rod portion 81 can be connected to the connecting portion 73 and the other end can be connected to the large end portion 76, so that there is no need to distinguish left and right. The steps of manufacturing and assembling can be further simplified and simplified.

In this embodiment, the small end 72 is
Sliding with the ball holding portion 101 of the piston 10 at the connection portion 73,
The large end 76 slides with the eccentric part 11 at the large end hole 77,
The small end 72 and the large end 76 are made of different sliding materials, respectively, to obtain optimum sliding conditions for different sliding parts, thereby improving reliability and sliding characteristics, and manufacturing suitable for each. By using the method, manufacturing can be facilitated and cost can be reduced.

For example, since the small end portion 81 has a spherical shape and a rod shape, it is formed by rimmed steel by header processing or welding of a bar material and a ball material, and the large end portion 76 has no longitudinal portion having holes and depressions. Since it is a mass close to a cube, it is manufactured by sintering and surface treatment, so that each can be easily manufactured and the sliding durability of the small end portion 81 can be increased. It is also possible to apply.

[0115]

As described above, the present invention provides a connecting rod having a small end portion loosely connected to a piston at a connecting portion and a large end hole connected to an eccentric portion of a crankshaft at a large end hole. A reciprocating compressor comprising: a large end of a connecting rod having a pin hole penetrating in parallel with the large end hole, and a projection having a guide portion projecting vertically downward from the thickness of the pin hole. The small end has a rod portion extending in the movement axis direction of the piston and a pin portion protruding from the rod portion and perpendicular to the movement axis of the piston at the end of the rod portion. Into the eccentric part, the pin part of the small end is inserted into the pin hole of the large end,
Furthermore, since the guide part at the large end contacts a part of the rod part, the geometrical axis arrangement of the connection part and the large end hole is maintained on the same plane, so that it will fall down or move horizontally when assembled. It is easy to assemble and secures reliability without horizontal disconnection, and the force acting in the axial direction of the connecting rod is received by the substantially cylindrical curved surface of the pin part, so that the surface pressure is dispersed, and the local pressure does not work. Wear and local contact noise can be reduced.

Further, the guide portion of the projection has a U-shaped contact surface which is open vertically downward with respect to the pin hole and has a tapered upper portion which is narrower at the upper portion and wider at the lower portion. An inclined surface that forms at least a part of the rod portion that comes into contact with the contact portion is formed so as to be inclined vertically upward and downward, and when the pin portion is inserted into the pin hole and the contact surface contacts the inclined surface at the same time, the contact surface is largely formed. Reciprocating with the geometrical arrangement of the end holes on the same plane, which facilitates assembling without falling down and horizontal movement during assembly and reduces horizontal dropout and vibration due to rattling A dynamic compressor can be provided.

Further, the projection has a projection, and the pin has a projection projecting from the upper surface of the projection when inserted into the pin hole, and the clamp includes the projection, the projection and the rod. The large end and the small end of the connecting rod are firmly fixed by contacting and sandwiching the bottom of the Reliability can be improved by more secure attachment.

A reciprocating compressor comprising a connecting rod having a small end loosely connected to a piston at a connecting portion and a large end connected to an eccentric portion of a crankshaft at a large end hole, The large end of the connecting rod has a projection in the radial direction of the large end hole, and the projection has a hemispherical spherical depression vertically upward,
A guide groove communicating with the spherical recess is provided in the radial direction of the large end hole, and the small end has a rod portion extending in the movement axis direction of the piston. Has a spherical part larger than the cross-section of the large end hole and the eccentric part, the spherical part of the small end is inserted into the spherical recess of the large end,
Furthermore, the insertion and contact of a part of the rod into the guide groove at the large end maintains the geometric axis arrangement of the connection and the large end hole on the same plane, making assembly extremely easy and horizontal. In addition to providing a reciprocating compressor that does not come off, the force that moves in the axial direction of the connecting rod is received by the spherical part and the hemispherical curved surface of the spherical depression, so the surface pressure is dispersed, local pressure does not work, local wear and local contact Sound generation can be reduced.

Further, a slit groove is provided in a part of the rod part or the sphere part of the small end part, and a groove is also provided in a part of the projection part of the large end part, and the clamp is inserted into both the slit groove and the groove. By doing so, the small end and the large end are locked, so that a reciprocating compressor can be provided which is extremely easy to assemble and has no horizontal detachment or rattling.

Further, the connection between the small end and the piston is loosely connected to the ball holding portion formed on the inner surface of the piston and the ball provided at the end of the small end, so that assembly is extremely easy. In addition, a reciprocating compressor capable of alleviating twisting during operation can be provided.

Further, since the large end portion and the small end portion are made of different sliding materials, the reliability can be improved by selecting and combining the sliding materials, and the manufacturing can be facilitated by the shape and material suitability. I can do it.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a first embodiment of a reciprocating compressor according to the present invention.

FIG. 2 is an exploded view of a connecting rod and a piston before assembling the reciprocating compressor of the reciprocating compressor of the embodiment.

FIG. 3A is a plan view of the reciprocating compressor according to the embodiment before a connecting rod is assembled. FIG. 3B is a longitudinal sectional view of the reciprocating compressor of the embodiment before the connecting rod is assembled.

FIG. 4 is an assembled perspective view of a connecting rod of Embodiment 2 of the reciprocating compressor according to the present invention.

FIG. 5 is an assembled perspective view of a connecting rod of a reciprocating compressor according to a third embodiment of the present invention.

FIG. 6 is an exploded view of a connecting rod and a piston before assembling a reciprocating compressor according to a fourth embodiment of the present invention.

FIG. 7 is a perspective view of the reciprocating compressor of the embodiment before a connecting rod is assembled.

FIG. 8 is a perspective view of a reciprocating compressor according to a fifth embodiment of the present invention before a connecting rod is assembled.

FIG. 9 is a perspective view of a reciprocating compressor according to the present invention when assembling a connecting rod of a sixth embodiment.

FIG. 10 is a sectional view of a conventional reciprocating compressor.

FIG. 11 is an exploded view of a connecting rod and a piston before assembling a reciprocating compressor of a conventional reciprocating compressor.

FIG. 12 is an exploded plan view of a large end and a small end of a connecting rod of a conventional reciprocating compressor.

[Explanation of symbols]

 71 Connecting rod 72 Small end 73 Connecting part 76 Large end 77 Large end hole 78 Pin hole 79 Guide part 80 Projection part 81 Rod part 82 Pin part 88 Contact surface 89 Inclined surface 90 Convex part 91 Top part 92 Projection 93 Clamp 94 Bottom 95 Spherical depression 96 Guide groove 97 Spherical part 98 Slit groove 99 Groove 100 Clamp 101 Ball holding part 102 Ball part

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Ikutomo Umeoka 4-5-2-5 Takaidahondori, Higashiosaka-shi, Osaka Inside Matsushita Refrigerating Machinery Co., Ltd. (72) Junta Kawabata Junta 4 No. 2-5 Matsushita Refrigerating Machinery Co., Ltd. (72) Inventor Akio Yagi 4-2-5 Matsushita Refrigerating Machinery Co., Ltd., Takaita Hondori 4-chome, Higashi-Osaka City, Osaka Prefecture Matsushita Refrigerating Machinery Co., Ltd. 4-5-2, Matsushita Refrigerating Machinery Co., Ltd. (72) Inventor Kenji Kaneshiro 4-5-2-5 Takaida Hondori, Higashi-Osaka City, Osaka Prefecture F-term in Matsushita Refrigerating Machinery Co., Ltd. 3H003 AA02 AB03 AC03 AD01 CB02 CE01

Claims (7)

[Claims] 1. A reciprocating compressor comprising a connecting rod having a small end loosely connected to a piston at a connection portion and a large end hole connected to an eccentric portion of a crankshaft at a large end hole, The large end of the connecting rod has a pin hole penetrating in parallel with the large end hole, and a projection having a guide portion projecting vertically downward from the thickness of the pin hole in a radial direction of the large end hole. The small end has a rod extending in the direction of the axis of motion of the piston, and a pin at the end of the rod protruding from the rod and perpendicular to the axis of motion of the piston; A hole is inserted into the eccentric portion, the pin portion at the small end is inserted into the pin hole at the large end, and the guide portion at the large end contacts a part of the rod portion. Thereby, the geometrical axis arrangement of the connection portion and the large end hole is maintained on the same plane. A reciprocating compressor. 2. The guide portion of the projection portion has a U-shaped contact surface having an upper portion opened vertically downward with respect to the pin hole and having a tapered upper portion with a narrow upper portion and a wider lower portion. An inclined surface that forms at least a part of the rod portion that comes into contact with is formed to be inclined downward from vertically above, and the pin portion is inserted into the pin hole and the contact surface comes into contact with the inclined surface at the same time. The reciprocating compressor according to claim 1, wherein the geometric axis arrangement of the connection portion and the large end hole is maintained on the same plane. 3. The projection has a projection, and the pin has a projection projecting from an upper surface of the projection when the pin is inserted into the pin hole, and the clamp includes the projection and the projection. 2. The reciprocating compressor according to claim 1, wherein the large end and the small end of the connecting rod are tightly fixed by being held in contact with the bottom surface of the rod part. 3. 4. A reciprocating compressor comprising a connecting rod having a small end loosely connected to a piston at a connection portion and a large end connected to an eccentric portion of a crankshaft at a large end hole, The large end of the connecting rod has a projection in a radial direction of the large end hole, and the projection has a hemispherical spherical recess vertically upward and a guide groove communicating with the spherical recess. A radial end of the hole, the small end having a rod extending in the direction of the axis of movement of the piston, and a sphere having a sphere at least vertically above the end of the rod and having a cross section larger than the cross section of the rod; The large end hole is inserted into the eccentric part, the spherical part of the small end is inserted into the spherical recess of the large end, and the rod is inserted into the guide groove of the large end. When a part of the portion is inserted and touched, the geometrical axis of the connection portion and the large end hole is adjusted. A reciprocating compressor wherein the positions are maintained on the same plane. 5. A rod part or a sphere part at a small end has a slit groove at a part thereof and a projection part at a large end also has a groove at a part thereof, and clamps both the slit groove and the groove. The reciprocating compressor according to claim 4, wherein the small end and the large end are locked by being inserted into the reciprocating compressor. 6. The connecting portion between the small end and the piston is formed by a loose fitting connection between a ball holding portion formed on the inner surface of the piston and a ball provided at an end of the small end. The reciprocating compressor according to claim 4 or 5. 7. The large end and the small end are made of different sliding materials, respectively.
A reciprocating compressor according to any one of the above.