JP2005264854A - Stirling engine and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a Stirling engine for stabilizing the centering of a displacer and a piston, simplifying its processes, and shortening its time, and to provide its manufacturing method. <P>SOLUTION: The displacer 2 has a displacer jet 16 for jetting operating medium from an internal space 15 toward a cylinder sliding face 10. A rod 3 has a rod jet 18 for jetting the operating medium from an axial through-hole 3a toward a piston sliding face 14. During centering, gas is filled from a nozzle inserted into an front end 17 of the rod 3 into the through-hole 3a. Thus, the gas is jetted from the rod jet 18 into a space between a rod sliding face 12 and the piston sliding face 14, and at the same time the gas is jetted from the displacer jet 16 into a space between a displacer sliding face 11 and the cylinder sliding face 10. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to the centering of a piston and a displacer of a Stirling engine.

  FIG. 20 is a cross-sectional view showing a configuration example of a conventional Stirling engine. As shown in FIG. 20, in a conventional Stirling engine, a piston 5 and a displacer 2 are fitted inside a cylinder 4. The piston 5 and the displacer 2 are provided in the cylinder 4 so as to reciprocate along a common drive axis X in a state having a predetermined phase difference.

  A rod 3 is attached to the displacer 2. The rod 3 is inserted into a through hole extending so as to include the drive shaft X of the piston 5. During operation of the Stirling engine, the piston 5 and the displacer 2 reciprocate along the inner peripheral surface of the cylinder 4. The cylinder 4 is supported by the pressure vessel 1 by being fixed to the pressure vessel 1. The displacer 2 is elastically supported by a displacer spring 7 via a rod 3. The piston 5 is elastically supported by a piston spring 6.

  A space formed by the pressure vessel 1 and the cylinder 4 is divided into two spaces by the piston 5. One of the two spaces is a working space (compression space and expansion space) 8 located on the displacer 2 side of the piston 5, and the other of the two spaces is opposite to the displacer 2 of the piston 5. It is the back space 9 located in the side. These two spaces are filled with a working medium such as high-pressure helium gas.

  The working space (expansion space) 8 on the distal end side of the displacer 2 and the working space (compression space) 8 on the piston 5 side of the displacer 2 communicate with each other via a medium flow passage 30 through which a working medium such as helium flows. A regenerator 40 that accumulates the heat of the working medium and supplies the accumulated heat to the working medium is provided in the medium flow path 30.

  The piston 5 reciprocates in the cylinder sliding surface 10 at a predetermined cycle together with the piston driver 60 by driving a linear motor 70 formed in the back space 9. The displacer 2 reciprocates according to a change in pressure of the working medium compressed or expanded in the working space 8.

  In order to smoothly reciprocate the piston 5 and the displacer 2 which are sliding parts, between the piston outer sliding surface 13 and the cylinder sliding surface 10, between the displacer sliding surface 11 and the cylinder sliding surface 10, and The dimensions of each component are designed so that a minute gap is formed between the rod sliding surface 12 and the piston sliding surface 14.

  However, in reality, the center position of the piston 5 and / or the displacer 2 (the piston and / or the outer circle of the displacer 2) due to the dimensional variation of each part and the positional deviation between the parts generated during assembly. In some cases, the center position is greatly deviated from the center position of the cylinder 4 (center position of the inner circle of the cylinder). As a result, the piston 5 and / or the displacer 2 and the cylinder 4 may come into contact with each other. Further, the piston 5 and the rod 3 may come into contact with each other.

  Therefore, friction or rubbing occurs between the displacer 2 and the cylinder 4, between the piston 5 and the cylinder 4, and between the rod 3 and the piston 5 during operation of the Stirling engine. As a result, each part is damaged or wear powder is generated. Therefore, there arises a disadvantage that the performance and reliability of the Stirling engine are greatly adversely affected.

In order to prevent the occurrence of this inconvenience, in the assembling process of the Stirling engine, the process of centering the piston 5 and the displacer 2 is indispensable for the purpose of preventing contact between the respective parts in each of the aforementioned sliding parts. It becomes.
JP 2003-194429 A

  As one of the piston centering methods used in the Stirling engine, after inserting the piston 5 into the cylinder 4, the piston 5 is vibrated by applying a constant voltage to the linear motor 70, and the piston 5 has a low input. There is a method of finding a position where the voltage vibrates most and fixing the piston 5 to the piston spring 6 via the magnet holder 80 at that position.

  Further, as another method, centering is performed by ejecting gas injected from the outside into the space in the piston 5 from the ejection ports provided at four positions on the circumferential surface of the piston 5 (Japanese Patent Laid-Open No. 2003-2003). No. 194429). However, these methods can only center the piston 5.

  That is, there is no particularly effective means for centering the displacer 2 at the present time. Therefore, after the displacer 2 is inserted into the cylinder 4, the displacer 2 is moved up and down to some extent, so that an operator confirms that there is no rubbing or contact between the displacer 2 and the cylinder 4. A method of fixing the position relative to the cylinder is employed.

  However, since this method is performed manually by a worker, the relative positional relationship between the displacer 2 and the cylinder 4 differs for each worker. As a result, the centering of the displacer 2 is not performed accurately, which may adversely affect the performance of the Stirling engine.

  Further, when the centering of the displacer 2 is not accurate, the amplitude of the displacer 2 becomes small due to friction or rubbing between the displacer 2 and the cylinder 4 during operation of the Stirling engine, so that the performance of the Stirling engine is deteriorated. Thus, the relative positional relationship between the displacer 2 and the cylinder 4 is greatly related to the performance or quality of the Stirling engine. Therefore, the relative positioning of the displacer 2 with respect to the cylinder 4, that is, accurate centering, It is essential to improve the performance of Stirling engines.

  Furthermore, in order to realize mass production, cost reduction, and high quality of the Stirling engine, it is necessary to simplify the centering method of the displacer 2.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to improve the centering accuracy of the displacer, simplify the centering method, and reduce the time required for the centering process. It is to provide an engine and a manufacturing method thereof.

  The Stirling engine of the present invention is a free piston type Stirling engine, and is provided in a piston that reciprocates in a cylinder, a displacer that reciprocates in the cylinder in a state having a predetermined phase difference with the piston, and a displacer. And a rod penetrating a sliding hole provided in the center of the piston. The displacer includes an internal space provided therein and a plurality of displacer through holes each extending from the internal space toward the inner peripheral surface of the cylinder. The rod has an axial through hole provided so as to extend along the axial direction, and a closing member for closing the axial through hole is provided.

  According to the above configuration, as will be described later, gas is injected from the inner space through the displacer through hole toward the inner peripheral surface of the cylinder by injecting gas from the axial through hole. Centering can be performed.

  The closing member may be a one-way valve that allows the gas to flow from the axial through hole toward the internal space and prevents the gas from flowing from the internal space toward the axial through hole. According to this, it is possible to prevent the gas from flowing back from the internal space to the through hole by the one-way valve.

  The rod preferably further includes a plurality of rod through holes each extending from the axial through hole toward the sliding hole of the piston. According to this, by injecting gas from the axial through hole, gas is ejected from the axial through hole toward the inner peripheral surface of the piston through the rod through hole, thereby centering the piston. Is possible.

  The plurality of displacer through-holes and the plurality of rod through-holes are configured such that when gas is injected into the internal space and the axial through-hole, the sum of the pressure vectors of the gas ejected from each is substantially zero. It is desirable. According to this manufacturing method, the centering of the displacer and the piston can be performed accurately.

  In the aforementioned Stirling engine manufacturing method, the displacer is centered by injecting gas into the internal space through the axial through hole and ejecting the gas from the displacer through hole toward the inner peripheral surface of the cylinder. . According to this, the centering of the displacer can be easily performed.

  In the above Stirling engine manufacturing method, the piston is centered by injecting gas into the internal space through the axial through hole and ejecting the gas from the rod through hole toward the piston sliding hole. May be. According to this, centering of a piston can be performed easily.

  Furthermore, in the aforementioned Stirling engine manufacturing method, gas may be injected into the internal space and the axial through hole, and the displacer and the piston may be centered at the same time. According to this, the manufacturing process of a Stirling engine can be shortened.

  Hereinafter, the Stirling engine and the manufacturing method thereof according to the present embodiment will be described with reference to FIGS. The basic structure of the Stirling engine of the present embodiment is the same as the structure of the Stirling engine shown in FIG. Therefore, as for the structure and function of the Stirling engine of the present embodiment, only the parts different from the structure and function of Stirling engine shown in FIG. 20 will be described.

  First, the displacer 2, the rod 3, the cylinder 4, and the piston 5 will be described with reference to FIGS.

  As shown in FIGS. 1 to 4, the displacer 2 according to the present embodiment includes a vent hole 50 that guides the working medium compressed in the working space (compression space) 8 by the reciprocating motion of the displacer 2 and the piston 5 to the inside of the displacer 2. It has. Further, the displacer 2 includes an internal space 15 that communicates with the vent hole 50 and stores the working medium. In the vicinity of the vent 50, the working medium is allowed to flow from the working space (compression space) 8 toward the inner space 15, but the working medium flows from the inner space 15 toward the working space (compression space) 8. A one-way valve (check valve) 51 for preventing this is provided. Further, the displacer 2 includes a displacer through hole 16 that communicates the internal space 15, the space between the displacer sliding surface 11 and the cylinder sliding surface 10. Therefore, during operation of the Stirling engine, the one-way valve 51 is opened, and the working medium in the working space (compression space) 8 passes through the communication hole 50, the inner space 15, and the displacer through hole 16 to the inner periphery of the cylinder 4. A gas bearing is formed between the displacer 2 and the cylinder 4 by being ejected toward the surface.

  Four displacer through holes 16 are provided. The displacer through-hole 16 can eject the gas in the internal space 15 toward the cylinder sliding surface 10. The four displacer through holes 16 have the same shape and the same size as each other, and are provided 90 ° apart from each other on the circumference. Accordingly, the total sum of the pressure vectors applied to the cylinder sliding surface 10 by the gas ejected from the four displacer through holes 16 becomes substantially zero.

  As shown in FIG. 1 to FIG. 3 and FIG. 5, the rod 3 according to the present embodiment is configured so that the inside of the rod 3 extends from the tip 17 to the internal space 15 in order to inject gas from the outside into the internal space 15. An axial through hole 3a is provided that penetrates along the direction in which 3 extends. Similar to the displacer through-hole 16, a rod through-hole 18 for ejecting the working medium inside the rod 3 to the in-piston sliding surface 14 is provided around the rod 3. During the operation of the Stirling engine, the working medium in the working space (compression space) 8 is ejected from the rod through hole 18 through the communication hole 50, the inner space 15, and the axial through hole 3a. A gas bearing is formed between the rod 3 and the piston 5.

  Four rod through holes 18 are provided. The four rod through holes 18 have the same shape and the same size as each other, and are provided 90 ° apart from each other on the circumference. Accordingly, the total sum of the pressure vectors applied to the sliding surface 14 in the piston by the gas ejected from the four rod through holes 18 becomes substantially zero.

  That is, the Stirling engine of the present embodiment can eject the gas at the same flow rate from each of the four displacer through-holes 16 toward the cylinder sliding surface 10 in the manufacturing process, and the four rod through-holes. A gas having the same flow rate can be ejected from each of 18 toward the sliding surface 14 in the piston.

  Next, the centering method of the displacer 2 and the piston 5 according to the embodiment will be described with reference to FIGS. The centering of the displacer 2 and the piston 5 is to make the cylindrical center axis (X axis) formed by the cylinder 4 substantially coincide with the columnar center axis formed by the displacer 2 and the piston 5.

  First, as shown in FIG. 6, the displacer 2 is inserted into a cylinder 4 fixed in the pressure vessel 1. Next, as shown in FIG. 7, the piston 5 provided with the magnet holder 80 is inserted into the cylinder 4. At this time, the displacer 2 is not fixed to the displacer spring 7 and the piston 5 is not fixed to the piston spring 6. Therefore, the position of the piston 5 and the displacer 2 can be minutely moved in the cylinder 4 in any radial direction of the inner circle of the cylinder 4, that is, in any of front, rear, left and right. In addition, in the state of FIG. 7, the piston bolt 22 as a fixing means of the piston 5 is in a temporarily tightened state.

  Next, as shown in FIGS. 13 and 14, a nozzle 19 for injecting gas is inserted into the distal end portion 17 of the rod 3. FIG. 13 is a view showing a state before the nozzle 19 is inserted into the distal end portion 17 of the axial through hole 3a. FIG. 14 is a diagram illustrating the state where the nozzle 19 is inserted into the distal end portion 17 of the axial through hole 3a. FIG. Thereby, a structure as shown in FIG. 8 is obtained. Thereafter, a gas indicated by an arrow 20 having a constant pressure is injected into the axial through hole 3 a of the rod 3 through the nozzle 19 and the tip 17 from the outside.

  At this time, as shown in FIGS. 3 and 5, the gas indicated by the arrow 20 passes through the tip 17 and the axial through hole 3 a of the rod 3, and then in a straight line from each of the four rod through holes 18. Gas is ejected toward the sliding surface 14. At the same time, as shown in FIGS. 3 and 4, after passing through the internal space 15, the gas is ejected from each of the four displacer through holes 16 in a straight line toward the cylinder sliding surface 10.

  Due to the gas ejected from the displacer through-hole 16, pressure is applied to the cylinder sliding surface 10 at a portion facing the displacer through-hole 16. The smaller the distance from the displacer through hole 16 to the cylinder sliding surface 10, the greater the pressure of the gas applied to the cylinder sliding surface 10, and the larger the distance from the displacer through hole 16 to the cylinder sliding surface 10, the more the cylinder sliding surface. The gas pressure applied to 10 is reduced.

  Since the position of the drive center axis of the displacer 2 is deviated from the position of the drive center axis (X in FIG. 20) of the cylinder 4, there is a portion where the cylinder sliding surface 10 and the displacer sliding surface 11 are in contact with each other. In this case, since the gas pressure applied to the cylinder sliding surface 10 is inversely proportional to the distance from the displacer through hole 16, the portion of the cylinder sliding surface 10 that is in contact with the displacer 2 is compared with other sliding surfaces. Therefore, a large pressure is applied to the gas.

  Since the displacer 2 is not fixed to the displacer spring 7, the displacer 2 slightly moves in the direction opposite to the gas pressure direction by the gas pressure described above. That is, in order to balance the pressure applied to the inner peripheral surface of the cylinder 4 by the gas ejected from the four displacer through holes 16, the distance between the cylinder sliding surface 10 and each of the four displacer through holes 16 is as follows. When the displacer 2 is moved slightly, it becomes almost the same. As a result, a cylindrical small gap having a constant width is formed between the cylinder sliding surface 10 and the displacer sliding surface 11. At this time, the piston 5 is once centered following the movement of the displacer 2 by the gas ejected from the rod through hole 18.

  Next, as shown in FIG. 9, the displacer bolt 21 as a displacer fixing means is fastened to the distal end portion 17 of the rod 3 so that the gas is injected into the internal space 15 and the axial through hole 3a. 3 and the displacer spring 7 are fixed. Thereby, centering of the displacer 2 is completed. At this time, since the piston 5 is not fixed to the rod 3, the piston 5 as shown in FIG. 8 is centered with respect to the cylinder 4. It is also possible that the contact has changed.

  Further, as shown in FIG. 10, when the gas is again injected into the axial through hole 3a of the distal end portion 17 of the rod 3 as shown by an arrow 20, the piston is aligned straight from the rod through hole 18 as shown in FIG. Gas is ejected toward the inner sliding surface 14. At this time, since the displacer 2 is fixed to the displacer spring 7, the relative position of the rod 3 with respect to the cylinder 4 does not move. Therefore, the piston 5 that is not fixed to the piston spring 6 performs a minute movement so that the distance between the rod sliding surface 12 and the piston sliding surface 14 is constant. That is, a cylindrical space having a certain width is formed between the piston 5 and the rod 3.

  In other words, since the position of the rod 3 is already fixed at the center position, the piston 5 moves relative to the rod 3 to the center position. In this state, the piston 5 and the piston spring 6 are fixed by strongly tightening the temporarily tightened piston bolt 22. As a result, the piston 5 is centered with respect to the cylinder 4 and its position is fixed. Thereby, as shown in FIG. 11, the centering of the piston 5 is completed.

  Thereafter, the nozzle 19 is removed from the tip portion 17. However, if the distal end portion 17 is left as it is, when the Stirling engine is operated, the working medium passes from the inner space 15 through the axial through hole 3a in the rod 3 and from the distal end portion 17 to the back space 9 described above. It flows toward. Thereby, the position of the amplitude center of the reciprocating motion of the piston 5 moves to the working space 8 side where the pressure is reduced. Thus, if the pressure of the working medium in the working space 8 decreases, the operating efficiency of the Stirling engine decreases.

  Further, when the amplitude center position of the piston 5 deviates from the initial setting position, there arises a problem that the piston 5 and the displacer 2 collide during operation of the Stirling engine. Therefore, after the centering of the piston 5 and the displacer 2 is completed, the working medium in the working space 8 is prevented from flowing into the back space 9 by closing the tip portion 17 of the axial through hole 3a with some closing member. There is a need.

  Therefore, after removing the nozzle 19, as shown in FIGS. 12, 15, and 16, the rod bolt 23 in which a protrusion having the same diameter as the tip portion 17 is formed is inserted into the tip portion 17. Thereafter, the tip 17 and the rod bolt 23 are fixed with an adhesive or the like. 15 is a view showing a state before the rod bolt 23 for closing the tip 17 of the through hole 3a is inserted into the through hole 3a, and FIG. 16 closes the tip 17 of the through hole 3a. It is a figure which shows the state after the rod bolt 23 for this was inserted in the through-hole 3a. According to this, since the through hole 3a is closed by the rod bolt 23, the working medium in the internal space 15 is prevented from flowing back through the through hole 3a during operation of the Stirling engine.

  Next, a one-way valve, that is, a check valve, for preventing the backflow of the working medium in the internal space 15 and the axial through hole 3a will be described with reference to FIGS.

  As shown in FIG. 17, a one-way valve 24 is attached to the rod 3 side of the internal space 15 of the displacer 2 described above. The one-way valve 24 is a valve that allows a gas flowing in a certain direction to pass therethrough but does not pass a gas flowing in a direction opposite to the certain direction.

  In the structure of the displacer 2, the piston 5 is centered using the method shown in FIGS. The structure shown in FIGS. 1 to 5 is shown in FIG. 16 in order to prevent the working medium from leaking from the tip 17 due to the working medium flowing backward from the inner space 15 to the tip 17 when the Stirling engine is driven. Thus, it is necessary to block the tip portion 17 with the rod bolt 23.

  However, in the structure as shown in FIGS. 17 to 19, since the one-way valve 24 is attached to the inside of the displacer 2, the gas flows from the distal end portion 17 to the internal space 15 when performing centering. In addition, the working medium can be prevented from flowing back from the internal space 15 to the tip portion 17 when the Stirling engine is operated. 18 is a diagram showing a state where the one-way valve 24 is open, and FIG. 19 is a diagram showing a state where the one-way valve 24 is closed.

  Therefore, according to the structure shown in FIGS. 17 to 19, the nozzle 19 can be moved when the structure shown in FIG. 11 is formed even if the axial through hole 3 a of the distal end portion 17 is not closed using the closing member. The centering of the piston 5 and the displacer 2 can be completed simply by removing it from the tip portion 17.

  The centering of the displacer 2 and the piston 5 in the present embodiment is thus completed. Thereafter, the remaining parts are assembled, and the working medium is filled in the pressure vessel 1 to complete the Stirling engine.

  According to the Stirling engine and the manufacturing method thereof, the centering of the displacer 2 and the piston 5 can be performed almost simultaneously and easily. In addition, an artificial centering error in the centering operation is reduced, and centering can be performed reliably and in a short time. As a result, a Stirling engine with high efficiency and high reliability can be manufactured.

  In the present embodiment, a method of injecting gas into the internal space 15 from the tip portion 17 of the axial through hole 3a is shown as an example, but the path for introducing the gas into the internal space 15 is in the axial direction. It is not limited to the through hole 3a. If the gas is ejected from the displacer through-hole 16, a gas supply path for introducing the gas into the internal space 15 with the piston 5 and the displacer 2 inserted into the cylinder 4. Anything other than the axial through hole 3a can achieve the purpose of centering the displacer.

  In this embodiment, centering is performed using a gas other than helium (an example of an inert gas) used as a working medium (refrigerant gas). However, if a working medium is used instead of this gas, the centering It is possible to save the trouble of sucking out the gas. However, when a one-way valve is provided on the rod 3 or the like, it is difficult to suck out the gas in the internal space 15, and therefore it is desirable to center using a working medium.

  Moreover, although the lock bolt is used as the closing member, the axial through hole 3a of the distal end portion 17 may be closed using an adhesive as another closing member.

  During operation of the Stirling engine, that is, when the piston 5 and the displacer 2 are reciprocating, the working medium is ejected from the rod through hole 18 described above, and the working medium is between the rod 3 and the piston 5. In addition to functioning as a gas bearing, a working medium is ejected from the displacer through hole 16 described above, and the working medium functions as a gas bearing between the cylinder 4 and the displacer 2. Therefore, according to the Stirling engine manufacturing method of the present embodiment, the centering of the displacer and the piston can be performed by effectively using the through hole for the gas bearing.

  Further, it should be considered that the embodiment disclosed this time is illustrative and not restrictive in all respects. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a schematic diagram of the longitudinal cross-section of the displacer and rod of embodiment. It is a perspective view of a displacer and a rod of an embodiment. It is a schematic diagram of a longitudinal section of a displacer, a rod, a piston, and a cylinder of an embodiment, and is a figure showing a gas flow. It is a schematic diagram of the cross section of the displacer and cylinder of embodiment. It is a cross-sectional view of the rod and piston of the embodiment. It is FIG. 1 for demonstrating the displacer and piston centering method of embodiment. It is FIG. 2 for demonstrating the centering method of the displacer and piston of embodiment. It is FIG. 3 for demonstrating the centering method of the displacer and piston of embodiment. It is FIG. 4 for demonstrating the displacer and piston centering method of embodiment. It is FIG. 5 for demonstrating the displacer and piston centering method of embodiment. It is FIG. 6 for demonstrating the displacer and piston centering method of embodiment. It is FIG. 7 for demonstrating the displacer and piston centering method of embodiment. It is a figure which shows the state before a nozzle is inserted in the front-end | tip part of a through-hole. It is a figure which shows the state after a nozzle is inserted in the front-end | tip part of a through-hole. It is a figure which shows the state before the rod volt | bolt for plugging up the front-end | tip part of a through-hole is inserted in a through-hole. It is a figure which shows the state after the rod volt | bolt for plugging up the front-end | tip part of a through-hole is inserted in the through-hole. It is a figure for demonstrating the non-return valve of embodiment. It is the elements on larger scale of Drawing 17, and is a figure showing the state where a check valve is opened. It is the elements on larger scale of Drawing 17, and is a figure showing the state where a check valve is closed. It is sectional drawing which shows the basic structure of the Stirling engine of embodiment.

Explanation of symbols

  1 pressure vessel, 2 displacer, 3 rod, 3a axial through hole, 4 cylinder, 5 piston, 6 piston spring, 7 displacer spring, 8 working space, 9 back space, 10 cylinder sliding surface, 11 displacer sliding surface, 12 Rod sliding surface, 13 Piston sliding surface, 14 Piston sliding surface, 15 Internal space, 16 Displacer through hole, 17 Tip, 18 Rod through hole, 19 Nozzle, 20 Arrow, 21 Displacer bolt, 22 Piston Bolt, 23 Rod bolt, 24 One-way valve.

Claims (7)

Free piston type Stirling engine,
A piston that reciprocates in the cylinder;
A displacer that reciprocates in the cylinder with a predetermined phase difference from the piston;
A rod provided in the displacer and penetrating a sliding hole provided in a central portion of the piston;
The displacer is
An internal space provided inside,
Each including a plurality of displacer through-holes extending from the internal space toward the inner peripheral surface of the cylinder,
The rod has an axial through hole provided so as to extend along the axial direction thereof, and a Stirling engine provided with a closing member for closing the axial through hole.   The closing member is a one-way valve that allows gas to flow from the axial through hole toward the internal space and prevents the gas from flowing from the internal space toward the axial through hole. 1. The Stirling engine according to 1. The Stirling engine according to claim 1, wherein the rod further includes a plurality of rod through holes each extending from the axial through hole toward the sliding hole of the piston.   The plurality of displacer through-holes and the plurality of rod through-holes are configured such that when gas is injected into the internal space and the axial through-hole, the sum of the pressure vectors of the gas ejected from each is substantially zero. The Stirling engine according to claim 3, which is configured. A method of manufacturing a Stirling engine according to claim 1,
Manufacturing of a Stirling engine that performs centering of the displacer by injecting gas into the internal space through the axial through hole and ejecting gas from the displacer through hole toward the inner peripheral surface of the cylinder. Method. It is a manufacturing method of the Stirling engine of Claim 3,
Manufacturing of a Stirling engine that performs centering of the piston by injecting gas into the internal space through the axial through hole and ejecting gas from the rod through hole toward the sliding hole of the piston Method.   The method for manufacturing a Stirling engine according to claim 6, wherein gas is injected into the internal space and the axial through hole, and the displacer and the piston are centered simultaneously.

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