JPH06207586A - Reciprocating compressor - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent the cylinder of the compressor body from protruding in the radial direction and to reduce the size. [Structure] The crankcase 22 of the compressor main body 21 is arranged so that the mounting seat portion 22C faces obliquely downward to the right (the side of the right supporting leg 2), and the cylinder 23 is mounted on the mounting seat portion 22C.
Is configured so as to extend toward the support leg 2 side. Therefore, the tip end side (cylinder head 25) of the cylinder 23 can be housed in the installation space of the support leg 2, and the cylinder head 25 can be prevented from independently protruding from the outer diameter of the air tank 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reciprocating compressor such as a reciprocating air compressor, and more particularly to a reciprocating compressor in which a gas tank and a compressor body are integrated.

[0002]

2. Description of the Related Art FIGS. 7 and 8 show a reciprocating air compressor as an example of a reciprocating compressor according to the prior art.

In the drawing, reference numeral 1 denotes an air tank as a gas tank installed on the installation surface F via support legs 2 to be described later, and the air tank 1 includes a cylindrical body 1A and a body 1A. , One side lid portion 1B for closing one end side of the body portion 1A
And is provided so as to close the other end of the body 1A,
The inner peripheral side is integrally formed with the other side lid portion 1D having the motor insertion hole 1C by fixing means such as welding. Further, an electric motor 3 described later is airtightly inserted into the motor insertion hole 1C, whereby the air tank 1 forms a closed container.

Reference numerals 2, 2, ... Denote four support legs provided on the outer peripheral side of the air tank 1. Each of the support legs 2 is made of an elastic rubber material, and the air tank 1 is mounted on the installation surface F. Is supported at a predetermined height position, and vibration of the air tank 1 and the like is damped while blocking vibration transmission between the air tank 1 and the installation surface F.

Reference numeral 3 denotes an electric motor, one end of which enters the air tank 1 through the motor insertion hole 1C and is arranged coaxially with the air tank 1, and which is an outer peripheral side of the electric motor 3. Is airtightly fixed to the motor insertion hole 1C. Then, the electric motor 3 is adapted to rotate and drive a drive shaft (not shown) by being supplied with electric power from the outside.

Reference numeral 4 denotes a compressor body provided on the other end side of the air tank 1, and 5 denotes a crankcase forming an outer shell of the compressor body 4. The crankcase 5 is the other end side of the electric motor 3. The case main body 5A is coaxially fixed to the case main body 5A, and a lid portion 5B that closes the other end of the case main body 5A.
A mounting seat 5C is formed on the upper side of the outer periphery of A and opens upward in the radial direction, and a cylinder 7 is mounted on the mounting seat 5C. In addition, in the crankcase 5,
One end side is connected to the drive shaft of the electric motor 3, and the other end side is protruded to the outside through the center of the lid portion 5B.
Is provided.

Reference numeral 7 denotes a cylinder provided on the outer peripheral side of the crankcase 5, and reference numeral 8 denotes a cylinder body which constitutes the cylinder 7 together with a cylinder head 9 which will be described later, as shown in FIG. The base end side is fixed to the mounting seat portion 5C of the crankcase 5, and the tip end side is formed in a cylindrical shape extending radially outward (upward). Further, in the cylinder body 8, a piston defining a compression chamber with the cylinder head 9 is axially slidably fitted,
The piston is connected to the crankshaft 6 via a connecting rod (neither is shown).

Reference numeral 9 denotes a cylinder head provided so as to close the front end side of the cylinder body 8, and the cylinder head 9 has a compression chamber defined in the cylinder body 8 through an intake port for releasing outside air. An intake valve that sucks in and an exhaust valve that discharges the compressed air compressed in the compression chamber from an exhaust port (both not shown) are provided.

Reference numeral 10 denotes a connecting pipe whose base end side is connected to the exhaust port of the cylinder head 9 and whose front end side is connected to the air tank 1. The connecting pipe 10 is an air tank for the compressed air discharged from the exhaust port. It is to be supplied within 1.

Reference numeral 11 denotes a cooling fan located at the other end of the crankcase 5 and attached to the other end of the crankshaft 6. The cooling fan 11 has the crankshaft 6 driven to rotate by the electric motor 3. By doing so, the compressor body 4, the air tank 1 and the like rotate together with the crankshaft 6 to cool them.

The reciprocating air compressor according to the prior art has the above-mentioned structure. When the crank shaft 6 is driven to rotate by the electric motor 3, the piston connected to the crank shaft 6 through the connecting rod is connected to the cylinder body. Reciprocating in 8
By the reciprocating movement of the piston, the outside air is sucked into the compression chamber defined in the cylinder body 8 through the intake port and the intake valve, and the air sucked into the compression chamber is boosted by the piston to the exhaust valve and the exhaust port. It is discharged into the connection pipe 10 via the connection pipe and is stored in the air tank 1 via the connection pipe 10.

Further, at this time, the cooling fan 11 provided on the other end side of the crankcase 5 rotates integrally with the crankshaft 6 to supply cooling air to the compressor body 4 and the air tank 1, and these It is cooled from the outside.

[0013]

By the way, in the reciprocating air compressor according to the above-mentioned conventional technique, the diameter of the air tank 1 has been reduced in order to meet the recent needs for downsizing. There is a limit to downsizing of the air tank 4, and even if the diameter of the air tank 1 is reduced, the cylinder 7 (cylinder head 9) of the compressor main body 4 projects above the outer diameter of the air tank 1 to cause the reciprocating air. There is a problem that the height dimension of the compressor cannot be reduced, which hinders downsizing.

The present invention has been made in view of the above-mentioned problems of the prior art, and provides a reciprocating compressor which can prevent the cylinder of the compressor body from protruding in the radial direction and can be downsized. With the goal.

[0015]

In order to solve the above-mentioned problems, the structure adopted by the first invention is such that a gas tank formed as a closed container and a support for the gas tank are provided.
A support leg provided on the outer peripheral side of the gas tank, a motor portion having one end side intruding into the gas tank, and another end portion provided on the other end side of the motor portion, and sucked by being rotationally driven by the motor portion. A compressor body for discharging gas into the gas tank, wherein the compressor body has a crankcase fixed to the other end side of the motor section, and a base end side fixed to an outer peripheral side of the crankcase; A cylinder whose tip side extends toward the support leg side, a crankshaft provided in the crankcase, and one end side of which is connected to the drive shaft of the motor section, and an axially slidable insertion in the cylinder. It includes a fitted piston and a connecting rod that connects the crankshaft and the piston.

Further, the structure adopted by the second invention is such that a cylindrical gas tank formed as a closed container, a motor portion having one end side intruding into the gas tank, and the other end side of the motor portion are provided. And a compressor main body for discharging the gas sucked into the gas tank by being rotationally driven by the motor section, the compressor main body being located at the other end side of the motor section. Of the crankcase arranged at a position eccentric to the outer peripheral side from the shaft center of the crankcase, the base end side being fixed to the outer peripheral side of the crankcase, and the distal end side being arranged to extend in the direction opposite to the eccentric direction of the crankcase A cylinder provided therein, a crank shaft provided in the crank case, one end side of which is connected to a drive shaft of the motor section; a piston axially slidably inserted into the cylinder; And comprising a connecting rod connecting the piston.

[0017]

According to the structure of the first aspect of the invention, since the tip end side of the cylinder is disposed so as to face the support leg side and is housed in the installation space of the support leg side, the cylinder alone does not protrude in the radial direction. It can be prevented.

Further, according to the structure of the second invention, the crankcase is arranged at a position eccentric to the outer peripheral side from the axial center of the gas tank, and the cylinder is arranged so as to extend in the direction opposite to the eccentric direction of the crankcase. Since it is provided, the cylinder can be housed within the outer diameter of the gas tank.

[0019]

Embodiments of the present invention will be described below with reference to FIGS.

First, FIGS. 1 and 2 show a first embodiment of the present invention. In the embodiment, the same components as those of the prior art shown in FIGS. 7 and 8 described above are designated by the same reference numerals, and the description thereof will be omitted.

In the figure, reference numeral 21 denotes a compressor body according to this embodiment, and the compressor body 21 includes a crankcase 22, a cylinder 23, a crankshaft 26, and a piston 2 which will be described later.
7, the connecting rod 28 and the like.

Reference numeral 22 denotes a crankcase forming an outer shell of the compressor body 21, and the crankcase 22 is a cylindrical case body 22 coaxially fixed to the other end of the electric motor 3.
A and a lid 22 for closing the other end of the case body 22A
The crankcase 22 is generally composed of B and is located on the outer periphery of the case body 22A and is located on the lower right side (see FIG. 1).
Mounting seat 22 that opens toward the inside, right side support leg 2 side)
C is formed, and a cylinder body 24, which will be described later, is attached to the attachment seat portion 22C.

Reference numeral 23 denotes a cylinder provided on the outer peripheral side of the crankcase 22, 24 denotes a cylinder body that constitutes a cylinder 23 together with a cylinder head 25, which will be described later. The cylinder body 24 has a base end side of the crankcase 22. It is fixed to the mounting seat portion 22C and is formed in a tubular shape whose tip end side extends toward the right side support leg 2 side. Further, as shown in FIG. 2, the inside of the cylinder body 24 has a piston sliding surface 24A on which the piston 27 slides.

Reference numeral 25 denotes a cylinder head provided so as to close the front end side of the cylinder body 24. The cylinder head 25 is provided with an intake port 25A for sucking outside air and an exhaust port for discharging compressed air. The intake port 25A and the exhaust port communicate with the inside of the cylinder body 24 via an intake valve and an exhaust valve (neither is shown).

Reference numeral 26 denotes a crankshaft rotatably provided in the crankcase 22, one end of which is connected to the drive shaft of the electric motor 3, the middle of which serves as a crank portion 26A and the other end of which is a lid. It projects outside through the center of the portion 22B.

Reference numeral 27 denotes a piston that is slidably inserted in the cylinder body 24 in the axial direction.
It is formed in a cylindrical shape with a lid to define a compression chamber A between it and the cylinder head 25, and the piston sliding surface 2 is formed on the outer peripheral side thereof.
4A piston ring 27A that keeps airtightly,
A rider ring 27B is provided for smoothing sliding with the piston sliding surface 24A.

Reference numeral 28 denotes a connecting rod whose base end side is rotatably connected to the crank portion 26A of the crank shaft 26 and whose tip end side is swingably connected to the piston 27 via a piston pin 29. By rotating the crankshaft 26, the piston 27 is reciprocated in the cylinder body 24.

Reference numeral 30 denotes a packing provided on the base end side of the cylinder body 24 for preventing foreign matter from entering.
The outer peripheral side is sandwiched between the cylinder body 24 and the mounting seat portion 22C of the crankcase 22, and the inner peripheral side forms a thin plate shape that closes the base end side of the cylinder body 24 while allowing the operation of the connecting rod 28. ing. And the packing 30
Is a foreign matter 31, such as chips and dust, in the crankcase 22,
.. are prevented from entering the cylinder body 24.

Reference numeral 32 denotes a connection pipe according to the present embodiment in which the base end side is connected to the exhaust port of the cylinder head 25 and the tip end side is connected to the air tank 1. The connection pipe 32 is the connection pipe 10 described in the prior art. Similarly, the compressed air discharged from the exhaust port is supplied into the air tank 1.

Reference numeral 33 indicates a cooling fan fixed to the other end of the crankshaft 26, and the cooling fan 33 is formed in the same manner as the cooling fan 11 described in the prior art.

The reciprocating air compressor according to this embodiment has the above-mentioned structure, and its basic operation is not different from that of the prior art.

In this embodiment, however, the crankcase 2
2, the mounting seat portion 22C has a diagonally lower right side (the right support leg 2
Side) and the cylinder 23 is attached to the mounting seat 22C by extending it toward the support leg 2 side, so that the tip end side (cylinder head 25) of the cylinder 23 is attached to the support leg 2C. The cylinder head 25 can be housed in the installation space and the cylinder head 25 can be prevented from independently protruding from the outer diameter of the air tank 1.

Thus, according to this embodiment, the cylinder 2
Since it is possible to prevent the tip end side of 3 from protruding independently from the outer diameter of the air tank 1, it is possible to reduce the height dimension of the reciprocating air compressor, and to achieve a large size reduction (space saving). be able to.

Further, between the cylinder body 24 and the mounting seat portion 22C of the crankcase 22, the cylinder body 24 is provided.
A packing 30 for closing the base end side of the cylinder is provided so that foreign matters 31 such as chips remaining in the crankcase 22 are
Since the foreign matter 31 prevents the piston sliding surface 24A, the piston ring 27A of the piston 27, the rider ring 27B, and the like from being damaged, it prevents the occurrence of compression leakage. Thus, the compression efficiency and the life can be greatly improved.

Next, FIG. 3 shows a second embodiment of the present invention, which is characterized in that an overhanging portion for preventing foreign matter intrusion is provided integrally with the crankcase. In this embodiment, the packing 30 described in the first embodiment is not provided. In the embodiment, the above-described FIG. 1 and FIG.
The same components as those of the first embodiment shown in FIG.

In the figure, reference numeral 41 denotes a crankcase according to this embodiment, and the crankcase 41 is coaxial with the other end of the electric motor 3 similarly to the crankcase 22 described in the first embodiment. A fixed cylindrical case body 41A, a lid portion 41B closing the other end side of the case body 41A, and a mounting seat located on the outer periphery of the case body 41A and opening toward the right supporting leg 2 side. Although generally composed of a portion 41C, an overhanging flange portion 42 for preventing foreign matter intrusion is formed on the inner peripheral side of the mounting seat portion 41C.

Here, the above-mentioned overhanging collar portion 42 is the mounting seat portion 4
It is integrally provided with the crankcase 22 so as to project inward in the radial direction from the inner periphery of 1C, and its inner peripheral end 42A is set to surround the connecting rod 28 with a margin. The overhanging flange portion 42 prevents the foreign matter 31 in the crankcase 41 from falling to the outer peripheral side of the piston 27, and the foreign matter 31 that has fallen through the inner peripheral end 42A is located inside the piston 27. It is guided so as to fall, thereby preventing damage to the piston sliding surface 24A, the piston ring 27A, the rider ring 27B, and the like.

Thus, in this embodiment having the above-mentioned structure, the same operation and effect as those of the first embodiment can be obtained. However, particularly in this embodiment, the protrusion for preventing foreign matter intrusion is provided. Since the collar portion 42 is provided integrally with the crankcase 41, it is possible to prevent the foreign matter 31 from entering without increasing the number of parts, and it is possible to improve the productivity and reduce the cost.

Next, FIG. 4 shows a third embodiment of the present invention. The feature of this embodiment is that the inside of the crankcase and the inside of the cylinder body are completely separated by a separating film for preventing foreign matter from entering. is there. In the embodiment, the same components as those in the first embodiment shown in FIGS. 1 and 2 described above are designated by the same reference numerals, and the description thereof will be omitted.

Reference numeral 51 denotes a connecting rod according to this embodiment. The connecting rod 51 has a crank portion 26A of the crankshaft 26 on the base end side thereof, which is similar to the connecting rod 28 described in the first embodiment.
Although it is rotatably connected to the piston 27 and the tip side is swingably connected to the piston 27 via the piston pin 29,
A fitting portion 51A for fitting the inner peripheral side of the isolation film 52, which will be described later, is formed in the upper and lower intermediate portions.

Reference numeral 52 denotes a mounting seat portion 22 of the crankcase 22.
The isolation film for preventing foreign matter intrusion provided between C and the cylinder body 24 is shown. The isolation film 52 has an outer peripheral side thereof on the cylinder body 24 and the mounting seat portion 22 of the crankcase 22.
The crankcase 2 is sandwiched between the crankcase 2 and C, and the inner peripheral side is fitted to the fitting portion 51A of the connecting rod 51.
The inside of 2 and the inside of the cylinder body 24 are completely separated. In addition, the isolation film 52 is formed in a thin film shape from a stretchable rubber material or the like, which allows the connecting rod 51 to move, while allowing the foreign matter 31 in the crankcase 22 to enter the cylinder body 24. Is surely prevented.

Thus, in this embodiment having the above-described structure, the same effect as that of each of the above-described embodiments can be obtained. However, particularly in this embodiment, the isolation film 52 is used.
Since the inside of the crankcase 22 and the inside of the cylinder body 24 are completely isolated from each other, it is possible to completely prevent the foreign matter 31 inside the crankcase 22 from entering the inside of the cylinder body 24.

Next, FIG. 5 shows a fourth embodiment of the present invention. The feature of this embodiment is that an adhesive layer is formed on the inner peripheral side of the crankcase and piston and the outer peripheral side of the connecting rod to remove foreign matter. It has been attached. In the embodiment, the same components as those in the first embodiment shown in FIGS. 1 and 2 described above are designated by the same reference numerals, and the description thereof will be omitted.

Reference numerals 61, 61, ... Denote adhesive layers formed on the inner peripheral side of the crankcase 22 and the piston 27 and on the outer peripheral side of the connecting rod 28, and each of the adhesive layers 61 is made of a resin having a constant adhesive force. It is formed by applying materials. Then, as shown in the figure, each adhesive layer 61 catches the foreign matter 31 scattered by the rotation of the crankshaft 26 or the like by the adhesive force and prevents it from entering between the piston sliding surface 24A and the piston 27. It is a thing.

Thus, in this embodiment having the above-described structure, it is possible to obtain substantially the same effects as those of the above-described embodiments, but in particular, in this embodiment, the crankshaft 26 in the crankcase 22 and The foreign matter 31 can be prevented from entering the connecting portion with the connecting rod 28, and the adhesive layer 61 can be easily formed by coating.

Next, FIG. 6 shows a fifth embodiment of the present invention, and the feature of this embodiment is that the compressor body is provided eccentrically from the axial center of the air tank to the outer peripheral side. In the embodiment, the same components as those of the prior art shown in FIGS. 7 and 8 described above are designated by the same reference numerals, and the description thereof will be omitted.

In the figure, reference numeral 71 denotes an air tank as a gas tank according to the present embodiment, which is installed on the installation surface F via each support leg 2. The air tank 71 is the air tank 1 described in the prior art. In a similar manner to the above, a cylindrical body 71A, one side lid 71B that closes one end of the body 71A, and another side of the body 71A that closes the other end are provided. The motor insertion hole 71C is integrally formed by fixing the other side lid portion 71D having the motor insertion hole 71C on the peripheral side by a fixing means such as welding, but the motor insertion hole 71C is the shaft of the air tank 71. It is formed at a position eccentric to the lower side from the center, whereby the electric motor 3 is fixed at the position eccentric to the lower side.

Reference numeral 72 denotes a compressor body provided on the other end side of the air tank 71, 73 denotes a crankcase forming an outer shell of the compressor body 72, and the crankcase 73 is the crankcase described in the prior art. 5, the air tank 71
A cylindrical case body 73A coaxially fixed to the other end of the electric motor 3 so as to be eccentric to the lower side from the axis center of the electric motor 3, a lid portion 73B closing the other end of the case main body 73A, and the case It is composed of a mounting seat portion 73C which is located on the outer periphery of the main body 73A and opens upward in the direction opposite to the eccentric direction described above.

In the crankcase 73, one end side is connected to the drive shaft of the electric motor 3, and the other end side is projected to the outside through the center of the lid portion 73B.
4 are provided.

Reference numeral 75 is a cylinder provided on the outer peripheral side of the crankcase 73, and 76 is a cylinder body that constitutes the cylinder 75 together with a cylinder head 77, which will be described later. It is fixed to the mounting seat portion 73C and is formed in a tubular shape whose tip side extends upward in the radial direction. In addition, the cylinder body 7
A piston that defines a compression chamber with the cylinder head 77 is axially slidably inserted into the cylinder 6, and the piston is connected via a connecting rod (not shown) to the crankshaft 74.
It is connected to the.

Reference numeral 77 is a cylinder head provided so as to close the front end side of the cylinder body 76. The cylinder head 77 sucks outside air into a compression chamber defined in the cylinder body 76 via an intake port. An intake valve and an exhaust valve (both not shown) for discharging compressed air compressed in the compression chamber from an exhaust port are provided.

Reference numeral 78 indicates a connecting pipe whose base end side is connected to the exhaust port of the cylinder head 77 and whose front end side is connected to the air tank 71. The connecting pipe 78 connects the compressed air discharged from the exhaust port to the air tank. 71 is supplied to the inside.

Reference numeral 79 denotes a cooling fan located at the other end of the crankcase 73 and attached to the other end of the crankshaft 74. The cooling fan 79 has the crankshaft 74 rotationally driven by the electric motor 3. As a result, the compressor main body 72, the air tank 71 and the like rotate together with the crankshaft 74 to cool them.

Thus, in this embodiment having the above-described structure, it is possible to obtain substantially the same effects as the above-described embodiments, but particularly in this embodiment, the compressor main body 72 is connected to the air tank 71. Since the cylinder 75 is eccentric to the lower side from the axial center to prevent the cylinder 75 from protruding from the outer diameter of the air tank 71, the cylinder 75 can be arranged upward and the foreign matter inside the cylinder body 76 can be disposed. It is possible to eliminate the configuration for intrusion into the compressor main body 72 and simplify the compressor main body 72.

In each of the embodiments, the case where the reciprocating air compressor as the reciprocating compressor is arranged on the installation surface F has been described as an example, but the present invention is not limited to this, and, for example, It may be applied to a reciprocating air compressor that hangs on the lower side of a top plate or the like via legs.

In the fifth embodiment, the compressor body 72 is eccentric to the air tank 71, and the cylinder 75
However, instead of this, for example, the compressor main body 72 may be eccentrically arranged on the upper side and the lateral side of the air tank 71 so that the cylinder 75 is arranged downward and sideways. In this case, the measures for preventing foreign matter intrusion described in the first to fourth embodiments may be taken.

[0057]

As described in detail above, according to the first aspect of the invention, the cylinder of the compression body is arranged so as to face the supporting leg side, and therefore the tip side of the cylinder is installed with the supporting leg. The reciprocating compressor can be miniaturized by disposing the cylinder in a space and preventing the cylinder from protruding in the radial direction by itself.

According to the second aspect of the invention, the crankcase of the compressor body is arranged at a position eccentric to the outer peripheral side from the axial center of the gas tank, and the cylinder is extended in the direction opposite to this eccentric direction. Since it is arranged in the above, the cylinder can be housed within the outer diameter of the gas tank, and the reciprocating compressor can be downsized.

[Brief description of drawings]

FIG. 1 is a front view showing a reciprocating air compressor according to a first embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view showing the compressor body in FIG. 1 in an enlarged manner as seen from the direction of arrows II-II in FIG.

FIG. 3 is a longitudinal sectional view showing a compressor body according to a second embodiment at the same position as in FIG.

FIG. 4 is a longitudinal sectional view showing a compressor body according to a third embodiment at a position similar to that of FIG.

5 is a longitudinal sectional view showing a compressor body according to a fourth embodiment at the same position as in FIG.

FIG. 6 is a front view showing a reciprocating air compressor according to a fifth embodiment.

FIG. 7 is a side view showing a reciprocating air compressor according to the prior art.

FIG. 8 is a front view of the reciprocating air compressor shown in FIG. 7.

[Explanation of symbols]

 1,71 Air tank (gas tank) 2 Support legs 3 Electric motor (motor part) 21,72 Compressor body 22,41,73 Crankcase 23,75 Cylinder 26,74 Crankshaft 27 Piston 28,51 Connecting rod

Claims (2)

[Claims] 1. A gas tank formed as a closed container, a support leg provided on an outer peripheral side of the gas tank to support the gas tank, and a motor portion having one end side intruding into the gas tank. A compressor main body which is provided on the other end side of the motor section and discharges gas sucked into the gas tank by being driven to rotate by the motor section. A crankcase fixed to the end side, a cylinder having a base end side fixed to the outer peripheral side of the crankcase, a tip end side extending toward the support leg side, and a cylinder provided in the crankcase, and one end side of the motor part Reciprocating compression composed of a crankshaft connected to the drive shaft of the crankshaft, a piston slidably inserted in the cylinder in the axial direction, and a connecting rod connecting the crankshaft and the piston. Machine . 2. A cylindrical gas tank formed as an airtight container, a motor portion having one end side intruding into the gas tank, and a motor portion provided at the other end side of the motor portion and driven to rotate by the motor portion. And a compressor main body for discharging the gas sucked into the gas tank, the compressor main body being located on the other end side of the motor portion and being eccentric to the outer peripheral side from the axial center of the gas tank. In the crankcase, a base end side of which is fixed to an outer peripheral side of the crankcase and a tip end side of which is arranged to extend in a direction opposite to the eccentric direction of the crankcase; A crankshaft having one end connected to the drive shaft of the motor portion, a piston slidably inserted in the cylinder in the axial direction, and a connecting rod connecting the crankshaft and the piston. When A reciprocating compressor composed of.