JP4873647B2 - Stirling engine - Google Patents

Description

  The present invention relates to a Stirling engine that can utilize a heat source such as waste heat or biomass.

Effective use of heat sources such as waste heat and biomass leads to the solution of environmental problems and energy problems. The Stirling engine is suitable for effective use of heat sources because it has the feature that it can be operated if there is a temperature difference regardless of the heat source.
Since the Stirling engine can be a heat source even at a low temperature, one of the development issues is to reduce the mechanical loss caused by the friction of the piston seal and the mechanism in order to achieve the target performance.
The Scotch-Yoke mechanism used in Stirling engines is a mechanism that reciprocates the yoke when a crankpin bearing mounted eccentrically on the output shaft rolls in an oval groove, and is perpendicular to the piston and the output shaft. By providing a guide such as a linear motion bearing in the direction, the side thrust acting on the piston can be canceled out.
The scotch / yoke mechanism is easier to shorten than the crosshead mechanism and the normal crank mechanism, and the lubrication device can be simplified by using grease-filled bearings for each part. Suitable for small output engines.
On the other hand, the Scotch-Yoke mechanism has problems of increased mechanical loss due to an increase in mass of the reciprocating portion of the yoke, strength of the contact between the crankpin and the yoke portion, and wear resistance. A Stirling engine having a highly reliable Scotch-Yoke mechanism has already been proposed (Patent Document 1).
Japanese Patent Application No. 2006-283323

  However, since the conventional Stirling engine has a configuration in which the scotch / yoke mechanism is attached to the crankcase, there is a problem that assembly work requiring high accuracy is extremely difficult and skill is required. In particular, since the crankcase has to have a pressure-resistant structure by a pressure-resistant member, it has been extremely difficult to improve the assembly accuracy.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a Stirling engine that is easy to assemble and has high assembly accuracy in a Stirling engine having a Scotch-yoke mechanism.

A Stirling engine of the present invention according to claim 1 is provided with a displacer piston and a power piston, and the displacer piston and the power piston are connected to a crankshaft via a Scotch yoke mechanism. A crankshaft bearing, wherein the scotch-yoke mechanism is eccentrically attached to the crankshaft, a bearing provided around the crankpin, a yoke having a long groove, and an operating direction of the yoke A Stirling engine comprising a displacer piston and a guide shaft that regulates in a movement direction of the power piston, and the yoke reciprocates along the guide shaft when the bearing rolls in the long groove, the Scotch Yoke mechanism and front A crankcase for maintaining the crankshaft in a high-pressure atmosphere, and a crankbox for fixing the crankshaft bearing and the guide shaft, wherein the crankbox is constituted by a member different from the crankcase. .
According to a second aspect of the present invention, in the Stirling engine according to the first aspect, a cylinder in which the displacer piston and the power piston slide, a base flange that fixes the cylinder, and an outer peripheral portion of the cylinder are arranged. A cooling portion flange formed on one end of the cooling portion is fixed to one surface of the base flange, and the ear portion formed on the top plate of the crank box is It is fixed to the other surface of the base flange.
According to a third aspect of the present invention, in the Stirling engine according to the second aspect, the inner peripheral surface of the cooling section is in contact with the outer peripheral surface on one end side of the cylinder, and the outer peripheral surface on the other end side of the cylinder is in contact with the outer peripheral surface. The inner peripheral surface of the opening formed in the top plate abuts.
According to a fourth aspect of the present invention, in the Stirling engine according to the second aspect, the crank box and the cylinder are integrally formed of the same member.
According to a fifth aspect of the present invention, in the Stirling engine according to the second aspect, the crank box and the base flange are integrally formed of the same member.
According to a sixth aspect of the present invention, in the Stirling engine according to the second aspect, the crank box, the base flange, and the cylinder are integrally formed of the same member.
According to a seventh aspect of the present invention, in the Stirling engine according to the first aspect, the crankbox is formed with a pair of side plates formed with openings for allowing the crankshaft to pass therethrough, and a fixing surface of the guide shaft. The top plate and the bottom plate are formed, the top plate is formed with an opening serving as a sliding space for the power piston, and a bearing holder is fixed to each of the openings provided in the pair of side plates, The crankshaft is attached to the crankbox by housing the crankshaft bearing in the bearing holder.
The present invention according to claim 8 is the Stirling engine according to claim 1, wherein the crankcase includes a generator connecting cylinder portion on a side surface of the trunk portion, and a generator connection cylinder end portion of the generator connecting cylinder portion. A flange is provided, a generator case side flange is provided at one end of the generator case, the generator connection flange and the generator case side flange are connected, and one end of the crankshaft is connected to the generator via a coupling. It is connected to a shaft for use.

  According to the present invention, it is possible to provide a Stirling engine in which a crankbox can be configured without considering pressure resistance, and a configuration in which a crankshaft bearing and a guide shaft are fixed to the crankbox can be easily designed. it can.

A Stirling engine according to a first embodiment of the present invention includes a crankcase that maintains a scotch-yoke mechanism and a crankshaft in a high-pressure atmosphere, and a crankbox that fixes a crankshaft bearing and a guide shaft. The crankcase is composed of a separate member. According to the present embodiment, by providing the crank box as a separate member from the crank case that is maintained in a high-pressure atmosphere, the crank box can be configured without considering pressure resistance. And the structure which fixes a guide shaft can be designed easily. Since the assembly can be performed with the crankshaft bearing and the guide shaft fixed to the crankbox, the assembly can be easily performed with high accuracy.
In the Stirling engine according to the first embodiment, the second embodiment of the present invention is arranged on a cylinder in which the displacer piston and the power piston slide, a base flange for fixing the cylinder, and an outer peripheral portion of the cylinder. A cooling portion flange formed on one end of the cooling portion is fixed to one surface of the base flange, and an ear portion formed on the top plate of the crank box is fixed to the other end of the base flange. It is fixed to the surface. According to the present embodiment, since the cooling unit is attached to one surface of the base flange and the crank box is attached to the other surface of the base flange, it is possible to ensure accuracy with reference to the base flange.
According to the third embodiment of the present invention, in the Stirling engine according to the second embodiment, the inner peripheral surface of the cooling unit abuts on the outer peripheral surface on one end side of the cylinder, and the top surface on the outer peripheral surface on the other end side of the cylinder. The inner peripheral surface of the opening formed in the plate comes into contact. According to the present embodiment, the cylinder is protruded from both surfaces of the base flange, and the inner peripheral surface of the cooling unit and the inner peripheral surface of the opening of the crank box are brought into contact with the outer peripheral surface of the cylinder, thereby adjusting the respective shaft centers. Can be easily performed.
The fourth embodiment of the present invention is a Stirling engine according to the second embodiment, in which a crankbox and a cylinder are integrally formed of the same member. According to the present embodiment, the crank box and the cylinder are integrally formed of the same member, so that the assembling work can be facilitated and the assembling accuracy can be increased.
In the fifth embodiment of the present invention, in the Stirling engine according to the second embodiment, the crank box and the base flange are integrally formed of the same member. According to the present embodiment, the crank box and the base flange are integrally formed of the same member, so that the assembling work can be facilitated and the assembling accuracy can be increased.
The sixth embodiment of the present invention is a Stirling engine according to the second embodiment, in which a crank box, a base flange, and a cylinder are integrally formed of the same member. According to the present embodiment, the crank box, the base flange, and the cylinder are integrally formed of the same member, so that the assembling work can be facilitated and the assembling accuracy can be increased.
According to a seventh embodiment of the present invention, in the Stirling engine according to the first embodiment, a crankbox is formed with a pair of side plates formed with openings for penetrating the crankshaft and a fixed surface of the guide shaft. The top plate and the bottom plate are formed, the top plate is formed with an opening serving as a sliding space for the power piston, the bearing holder is fixed to each of the openings provided in the pair of side plates, and the crankshaft bearing is mounted. The crankshaft is attached to the crankbox by being housed in the bearing holder. According to the present embodiment, the crankbox is formed in a rectangular parallelepiped, and the crankshaft and the power piston are fixed using the respective surfaces forming the rectangular parallelepiped, so that the deviation of the mounting angle of each member is minimized. be able to.
According to an eighth embodiment of the present invention, in the Stirling engine according to the first embodiment, a generator connecting cylinder portion is provided on a side surface of a trunk portion of a crankcase, and a generator is provided at an end of the generator connecting cylinder portion. A connecting flange is provided, a generator case side flange is provided at one end of the generator case, the generator connecting flange and the generator case side flange are connected, and one end of the crankshaft is connected to the generator shaft via a coupling. To connect to. According to the present embodiment, not only the crankshaft but also the generator shaft is not fixed to the crankcase, so that the assembling accuracy can be increased and the assembling work can be easily performed.

A Stirling engine according to an embodiment of the present invention will be described below.
First, the external configuration of the Stirling engine will be described with reference to FIG.
FIG. 1 is a perspective view showing a configuration of a Stirling engine according to the present embodiment.
As shown in FIG. 1, the Stirling engine according to the present embodiment is configured by stacking a heating unit 10, a regeneration unit 20, and a cooling unit 30 on one side of a base flange 40. The Stirling engine includes a crankcase 50 on the other side of the base flange 40. The crankcase 50 includes a generator case 60 and an encoder case 51.
The Stirling engine uses the heating unit 10 installed in a heat source gas flow path for discharging exhaust gas generated from, for example, a marine diesel engine.
The cooling unit 30 includes a cylindrical cooling unit body 31 and cooling unit flanges 32 and 33 formed at both ends of the cooling unit body 31. One cooling part flange 32 is fixed to one surface of the base flange 40.
The reproducing unit 20 includes a cylindrical reproducing unit body 21 and reproducing unit flanges 22 and 23 formed at both ends of the reproducing unit body 21. One of the reproduction unit flanges 22 is fixed to the other cooling unit flange 33.
The heating unit 10 includes a plurality of heater tubes 11 bent into a U-shape and a heating unit flange 12 that fixes the open ends of the heater tubes 11. The heating part flange 12 is fixed to the other reproduction part flange 23. The heater tube 11 is provided with a large number of heat exchange fins 13.
The crankcase 50 includes a cylindrical crankcase body 52 and a crankcase body flange 53 formed at one end of the crankcase body 52. Further, a generator connecting cylinder portion 54 is provided on the side surface of the crankcase body portion 52 on the same axis as the cylindrical encoder case 51. A generator connection flange 55 is provided at an end of the generator connection cylinder portion 54.
A generator case side flange 61 is provided at one end of the generator case 60, and the generator case side flange 61 and the generator connection flange 55 are connected to each other. Note that the inside of the crankcase 50 is maintained in a high-pressure atmosphere, and in the present embodiment, the generator case 60 is also maintained in the same high-pressure atmosphere as in the crankcase 50.

Next, the internal structure of the Stirling engine will be described with reference to FIGS.
2 is a partially sectional perspective view showing the configuration of the Stirling engine, and FIG. 3 is a side sectional view showing the configuration of the Stirling engine.
The Stirling engine has a displacer piston 71 and a power piston 72. Displacer piston 71 and power piston 72 are each connected to crankshaft 80. One end of the crankshaft 80 is connected to the generator shaft 62 via the coupling 81, and the other end is connected to the encoder 63 via the coupling 82. A flywheel 64 is provided on one end side of the crankshaft 80. Here, as the couplings 81 and 82, rubber couplings that can permit the axial alignment of the crankshaft 80 and the generator shaft 62 are suitable.
A cylinder 73 is provided in the movement range of the displacer piston 71 and the power piston 72.
On the outer periphery of the cylinder 73, the cooling unit 30 and the base flange 40 are located.
The displacer piston 71 is provided with a displacer cap 71a.
In the heating unit 10, a heating unit head 14 is formed at the center of the heating unit flange 12.
The heating unit head 14 is formed in the same shape as the top of the displacer cap 71a. One space of the displacer piston 71 is formed between the heating unit head 14 and the displacer cap 71 a, and the other space of the displacer piston 71 is formed between the displacer piston 71 and the power piston 72.
One end 11 a of the heater tube 11 communicates with one space of the displacer piston 71. Further, the other end 11 b of the heater tube 11 communicates with the regeneration unit 20, the regeneration unit 20 communicates with the cooling unit 30, and the cooling unit 30 communicates with the other space of the displacer piston 71.
A cylindrical member 24 concentric with the cylinder 73 is disposed inside the reproducing unit 20. A plurality of circular tubes are arranged in the axial direction of the reproducing unit 20 between the inner peripheral surface of the reproducing unit 20 and the tubular member 24. The gap between each circular tube is filled with a wire mesh matrix material such as austenitic stainless steel or brass. The working gas passes through the matrix material and flows to the heater tube 11 or the cooling unit 30. The working gas absorbs heat from the matrix material or dissipates heat to the matrix material when passing through the regeneration unit 20. Illustration of the circular pipe and the matrix material is omitted.
The cooling unit 30 is divided into a passage through which cooling water flows and a passage through which working gas flows, and the working gas is cooled by the cooling water.

The displacer piston 71 and the power piston 72 are connected to the crankshaft 80 via a Scotch / yoke mechanism 90. The displacer piston 71 and the power piston 72 are shifted in phase by a predetermined angle.
Here, the scotch-yoke mechanism 90 will be described with reference to FIGS.
4 is a front view of the main part showing the configuration of the scotch / yoke mechanism according to the present embodiment, FIG. 5 is a perspective view of the main part showing the scotch / yoke mechanism, and FIG. 6 shows the connection between the power piston and the crankshaft. FIG. 7 is a perspective view of the main part of the Scotch-yoke mechanism showing the connection between the displacer piston and the crankshaft. FIG. 8 is a perspective view of the main part of the Scotch-yoke mechanism showing the connection in the crankshaft. It is a principal part perspective view.
A scotch-yoke mechanism 90a that connects the power piston 72 and the crankshaft 80 includes a piston crankpin 91a eccentrically attached to the crankshaft 80, a piston bearing 92a provided around the piston crankpin 91a, The piston yoke 94a is formed with a long groove 93a, and the piston yoke 94a reciprocates when the piston bearing 92a rolls in the long groove 93a. The Scotch yoke 90a is connected to the power piston 72 by a power piston board 74 as shown in FIG. Further, guide shafts 95a are provided on both sides of the piston yoke 94a in the direction of operation of the power piston 72. The piston yoke 94a is provided on the guide shaft 95a via a linear bearing. The guide shaft 95a restricts the operation direction of the piston yoke 94a to the operation direction of the power piston 72.
Two plates 96a and 97a are provided on the inner peripheral surface of the long groove 93a of the piston yoke 94a. An upper plate 96a is provided on the inner peripheral surface of the long groove 93a on the power piston 72 side, and a lower plate 97a is provided on the inner peripheral surface of the long groove 93a on the side opposite to the power piston 72. The piston bearing 92a has an upper plate 96a and a lower plate 97a as sliding surfaces.
An aluminum alloy is used for the piston yoke 94a, and carbon steel is used for the plates 96a and 97a. In this way, the plates 96a and 97a are made of a material harder than the material of the piston yoke 94a, so that only the plates 96b and 97b slide on the plates 96b and 97b which are contact surfaces with the outer peripheral wall surface of the piston bearing 92a. Abrasion resistance can be increased by applying an optimum material, hardness, surface treatment, etc. for enhancing the properties. Furthermore, even if it is replaced due to wear or the like, it is only necessary to replace the plates 96b and 97b without replacing the piston yoke 94a, resulting in a Stirling engine with good maintainability. In addition, an outer ring | wheel is rotated using the ball bearing for the bearing 92a for pistons.

4 and 7, the scotch-yoke mechanism 90b for connecting the displacer piston 71 and the crankshaft 80 includes a displacer crankpin 91b eccentrically attached to the crankshaft 80, and a displacer crankpin 91b. A displacer bearing 92b provided around and a displacer yoke 94b having a long groove 93b. The displacer yoke 92b reciprocates when the displacer bearing 92b rolls in the long groove 93b. The scotch yoke 90 b is connected to the displacer piston 71 by a displacer rod 75. Further, guide shafts 95b are provided on both sides of the displacer yoke 94b in the operation direction of the displacer piston 71. The displacer yoke 94b is provided on the guide shaft 95b via a linear bearing. The guide shaft 95b restricts the operation direction of the displacer yoke 94b to the operation direction of the displacer piston 71.
Two plates 96b and 97b are provided on the inner peripheral surface of the long groove 93b of the displacer yoke 94b. An upper plate 96b is provided on the inner peripheral surface of the long groove 93b on the displacer piston 71 side, and a lower plate 97b is provided on the inner peripheral surface of the long groove 93b on the side opposite to the displacer piston 71. The displacer bearing 92b has an upper plate 96b and a lower plate 97b as sliding surfaces.
An aluminum alloy is used for the displacer yoke 94b, and carbon steel or the like is used for the plates 96b and 97b. Thus, by configuring the plates 96b and 97b with a material harder than the material of the displacer yoke 94b, only the plates 96b and 97b slide on the plates 96b and 97b which are contact surfaces with the outer peripheral wall surface of the piston bearing 92a. Abrasion resistance can be increased by applying an optimum material, hardness, surface treatment, etc. for enhancing the properties. Furthermore, in the case of replacement due to wear or the like, only the plates 96b and 97b can be replaced without replacing the displacer yoke 94b, resulting in a Stirling engine with good maintainability. A ball bearing is used as the displacer bearing 92b to rotate the outer ring.

Next, the crankbox that houses the Scotch-yoke mechanism will be described with reference to FIGS.
FIG. 9 is a perspective view of a crank box according to the present embodiment, and FIG. 10 is a perspective view of a main part showing a state in which the crank box is attached to a base flange.
As shown in FIG. 9, the crankbox 100 forms side plates 103 and 104 having openings 101 and 102 for allowing the crankshaft 80 to pass therethrough, and fixed surfaces for the guide shafts 95 a and 95 b of the Scotch yoke mechanism 90. The top plate 105 and the bottom plate 106 are formed. One side plate 103 is in a position facing the other side plate 104, and the top plate 105 is in a position facing the bottom plate 106.
An opening 107 serving as a sliding space for the power piston 72 is formed in the top plate 105, and an opening 108 is formed in the bottom plate 106. Further, the top plate 105 is provided with a pair of ears 109, and a base flange mounting hole 110 is formed in the ears 109.
A guide shaft mounting hole 111 is formed in the top plate 105 and the bottom plate 106. As shown in FIG. 5, guide shafts 95 a and 95 b are fixed to the guide shaft mounting hole 111.
As shown in FIGS. 3 and 10, the bearing holder 121 is fixed to the opening 101, and the bearing holder 122 is fixed to the opening 102. And the crankshaft 80 is attached to the crankbox 100 by accommodating the crankshaft bearings 123 and 124 provided at both ends of the crankshaft 80 shown in FIG. 8 in the bearing holders 121 and 122, respectively.
By attaching the guide shafts 95a and 95b to the guide shaft mounting hole 111, the scotch / yoke mechanism 90a on the power piston 72 side shown in FIG. 6 and the scotch / yoke mechanism 90b on the displacer piston 71 side shown in FIG. Attach to 100. Then, the crankshaft 80 shown in FIG. 8 is inserted, and the bearing holder 121 is attached to the opening 101 and the bearing holder 122 is attached to the opening 102. FIG. 5 shows a state where the crankshaft 80 is attached to the crankbox 100 in this manner.

Next, attachment of the crankbox 100 to the base flange 40 will be described.
As shown in FIG. 10, the crankbox 100 is attached to the other surface of the base flange 40. The cylinder 73 is bolted by bringing the flange portion 73a into contact with the other surface of the base flange 40. In addition, it is preferable to attach the cylinder 73 to the base flange 40 before attaching the crankbox 100 to the base flange 40. One end portion of the cylinder 73 protrudes from one surface of the base flange 40 and is located in the crank box 100 when the crank box 100 is assembled. Therefore, by attaching the cylinder 73 to the base flange 40, the attachment adjustment of the crankbox 100 to the base flange 40 can be performed using the cylinder 73 as a reference plane.
The crank box 100 is attached to the base flange 40 by inserting bolts into the base flange attachment holes 110.

Next, the crankcase will be described.
FIG. 11 is a partial cross-sectional perspective view of the crankcase.
Bolt holes 53 a are formed in the crankcase trunk flange 53, and bolt holes 55 a are also formed in the generator connection flange 55.
In the crankcase 50, the crankcase body flange 53 is bolted to one surface of the base flange 40 using a bolt hole 53a. In addition, the generator case 60 is bolted to the generator connection flange 55 and the generator case side flange 61 using bolt holes 55a.
In the above configuration, the working gas in one space of the displacer piston 71 and the working gas in the other space move by operating the displacer piston 71 using the generator as a power source at the start. The working gas is heated and expanded by the heating unit 10 and introduced into one space, and cooled and contracted by the cooling unit 30 and introduced into the other space, whereby pressure fluctuations occur in one space and the other space. Occurs. An output can be obtained by operating the power piston 72 by the pressure fluctuation in the working space.

As described above, according to this embodiment, the crankcase 50 that maintains the scotch-yoke mechanism 90 and the crankshaft 80 in a high-pressure atmosphere, and the crankbox that fixes the crankshaft bearings 123 and 124 and the guide shafts 95a and 95b. 100, the crank box 100 is configured as a member different from the crank case 50, the scotch yoke mechanism 90 is housed in the crank box 100, and the crank shaft 80 is also supported by the crank box 100. Is just functioning as a cover. Therefore, the crankcase 50 that must have a pressure-resistant structure does not require assembly accuracy, and the crankbox 100 that requires assembly accuracy does not need to have a pressure-resistant structure, so that the crankbox 100 can be manufactured with high accuracy. As a result, the assembly accuracy can be increased.
Further, according to the present embodiment, the cylinder 73 in which the displacer piston 71 and the power piston 72 slide, the base flange 40 that fixes the cylinder 73, and the cylindrical cooling unit 30 that is disposed on the outer periphery of the cylinder 73 are provided. The cooling portion flange 32 formed at one end of the cooling portion 30 is fixed to one surface of the base flange 40, and the ear portion 109 formed on the top plate 105 of the crank box 100 is fixed to the other end of the base flange 40. By fixing to the surface, the accuracy can be ensured based on the base flange 40.
Further, according to this embodiment, the inner peripheral surface of the cooling unit 30 abuts on the outer peripheral surface on one end side of the cylinder 73, and the inner periphery of the opening 107 formed on the top plate 105 on the outer peripheral surface on the other end side of the cylinder 73. The surfaces abut. Accordingly, the cylinder 73 is protruded from both surfaces of the base flange 40, and the inner peripheral surface of the cooling unit 30 and the inner peripheral surface of the opening 107 of the crankbox 100 are brought into contact with the outer peripheral surface of the cylinder 73, so The heart can be adjusted easily.
Further, according to the present embodiment, the crankbox 100 has a pair of side plates 103 and 104 in which openings 101 and 102 for penetrating the crankshaft 80 are formed, and a top plate that forms a fixing surface of the guide shafts 95a and 95b. 105 and the bottom plate 106, the top plate 105 is formed with an opening 107 serving as a sliding space for the power piston 72, and the openings 101 and 102 provided in the pair of side plates 103 and 104 are respectively provided with bearing holders 121. , 122 are fixed, and the crankshaft bearings 123, 124 are accommodated in the bearing holders 121, 122, so that the crankshaft 80 is attached to the crankbox 100. Accordingly, the crankbox 100 is formed in a rectangular parallelepiped, and the crankshaft 80 and the power piston 72 are fixed using the respective surfaces forming the rectangular parallelepiped, so that the deviation of the mounting angle of each member can be minimized. .
In addition, according to the present embodiment, the generator connecting tube portion 54 is provided on the side surface of the body portion 52 of the crankcase 50, and the generator connecting flange 55 is provided at the end of the generator connecting tube portion 54. The generator case side flange 61 is provided at one end of the generator, the generator connection flange 55 and the generator case side flange 61 are connected, and one end of the crankshaft 80 is connected to the generator shaft 62 via the coupling 81. is doing. Accordingly, since not only the crankshaft 80 but also the generator shaft 62 is not fixed to the crankcase 50, the assembling accuracy can be improved and the assembling work can be easily performed.

In the present embodiment, the crank box 100 and the cylinder 73 are described as separate members. However, the crank box 100 and the cylinder 73 may be integrally formed with the same member. By integrally molding the crank box 100 and the cylinder 73 with the same member, the assembling work can be facilitated and the assembling accuracy can be increased.
In the present embodiment, the crank box 100 and the base flange 40 are described as separate members. However, the crank box 100 and the base flange 40 may be integrally formed with the same member. By integrally molding the crank box 100 and the base flange 40 with the same member, the assembling operation can be facilitated and the assembling accuracy can be increased.
Further, the crank box 100, the base flange 40, and the cylinder 73 may be integrally formed with the same member. By integrally molding the crank box 100, the base flange 40, and the cylinder 73 with the same member, the assembling work can be facilitated and the assembling accuracy can be increased.

  The Stirling engine of the present invention can be used as a power generator or a power unit that utilizes heat source gas such as waste heat or biomass.

The perspective view which shows the structure of the Stirling engine by a present Example. Partial cross-sectional perspective view showing the configuration of the Stirling engine Side sectional view showing the configuration of the Stirling engine The principal part front view which shows the structure of the scotch yoke mechanism by a present Example. Perspective view of main part showing the Scotch-Yoke mechanism Scotch-yoke mechanism showing connection between power piston and crankshaft Perspective view of main part of scotch-yoke mechanism showing connection between displacer piston and crankshaft Perspective view of main part of scotch-yoke mechanism showing connection in crankshaft The perspective view of the crankbox by a present Example The principal part perspective view which shows the state which attached the crankbox to the base flange Partial cross-sectional perspective view of the crankcase

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Heating part 11 Heater pipe 12 Heating part flange 13 Heat exchange fin 20 Reproduction part 21 Reproduction part trunk | drum 22, 23 Reproduction part flange 30 Cooling part 31 Cooling part trunk | drum 32, 33 Cooling part flange 40 Base flange 50 Crankcase 51 Encoder Case 52 Body 53 Crankcase Body Flange 54 Generator Connection Tube 55 Generator Connection Flange 60 Generator Case 61 Generator Case Side Flange

Claims (8)

It has a displacer piston and a power piston,
Connecting the displacer piston and the power piston to a crankshaft via a Scotch-Yoke mechanism;
Crankshaft bearings are provided at both ends of the crankshaft,
The Scotch-Yoke mechanism,
A crankpin attached eccentrically to the crankshaft;
A bearing provided around the crankpin;
A yoke with a long groove;
The yoke is composed of a guide shaft that regulates the operation direction of the displacer piston and the operation direction of the power piston,
A Stirling engine in which the yoke reciprocates along the guide shaft as the bearing rolls in the long groove,
A crankcase for maintaining the scotch-yoke mechanism and the crankshaft in a high-pressure atmosphere;
A crank box for fixing the crankshaft bearing and the guide shaft;
A Stirling engine, wherein the crank box is formed of a member different from the crank case. A cylinder in which the displacer piston and the power piston slide, a base flange that fixes the cylinder, and a cylindrical cooling portion that is disposed on the outer periphery of the cylinder;
Fixing a cooling part flange formed on one end of the cooling part to one surface of the base flange;
The Stirling engine according to claim 1, wherein an ear portion formed on the top plate of the crank box is fixed to the other surface of the base flange.   The inner peripheral surface of the cooling portion is in contact with the outer peripheral surface on one end side of the cylinder, and the inner peripheral surface of the opening formed in the top plate is in contact with the outer peripheral surface on the other end side of the cylinder. The Stirling engine according to claim 2.   The Stirling engine according to claim 2, wherein the crank box and the cylinder are integrally formed of the same member.   The Stirling engine according to claim 2, wherein the crank box and the base flange are integrally formed of the same member.   The Stirling engine according to claim 2, wherein the crank box, the base flange, and the cylinder are integrally formed of the same member.   The crank box is formed by a pair of side plates having openings for penetrating the crankshaft, and a top plate and a bottom plate forming a fixed surface of the guide shaft, and the top plate includes the power piston. The bearings are fixed to the openings provided in the pair of side plates, and the crankshaft bearing is housed in the bearing holder, thereby The Stirling engine according to claim 1, wherein the Stirling engine is attached to the crank box.   Provided on the side surface of the body of the crankcase is a generator connecting cylinder, provided at the end of the generator connecting cylinder is a generator connecting flange, and at one end of the generator case is provided with a generator case side flange, The Stirling engine according to claim 1, wherein the generator connecting flange and the generator case side flange are connected, and one end of the crankshaft is connected to the generator shaft through a coupling.