JP2010096140A - Rotary motion and linear reciprocating motion conversion device and engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve durability and conversion efficiency in a rotary motion and linear reciprocating motion conversion device. <P>SOLUTION: The rotary motion and linear reciprocating motion conversion device 22 converts rotary motion of a rotary shaft 29 and linear reciprocating motion of each output piston 3 in both directions by successive rotary spiral motion of each inclined side connecting member. Each arm 26 is supported to an inclined member 25 in such a manner that it rotates around an axial center line of the arm 26. Each inclined side connecting member is supported in such a manner that it rotates around an axial center crossing the axial center line of the arm 26 at right angle. Each inclined side connecting member and each reciprocating side connecting member 30 are connected through an eccentric shaft so as to convert rotary spiral motion of the inclined side connecting member and linear reciprocating motion of the reciprocating side connecting member 30 in both directions. Only rolling friction with the reciprocating side connecting member 30 is generated thereby when the inclined side connecting member performs rotary spiral motion. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a rotational motion / linear reciprocating motion conversion device suitable for use in an external combustion engine such as a Stirling engine or a steam engine, or an internal combustion engine such as a gasoline engine or a diesel engine, and the rotational motion / linear reciprocating motion. The present invention relates to an engine in which a conversion device is incorporated (whether it is an external combustion engine or an internal combustion engine).

  Conventionally, as this type of rotational motion / linear reciprocating motion conversion device, a Z crank type has been proposed (for example, see Patent Document 1). In this Z-crank type rotational motion / linear reciprocating motion conversion device, a rotational shaft that performs rotational motion and a plurality of reciprocating members that perform linear reciprocal motion are connected via a Z-shaped shaft, thereby rotating the linear motion and linear motion. The reciprocating motion can be converted in both directions.

That is, in this rotational motion / linear reciprocating motion conversion device, the inclined member is constrained from rotating about the rotational axis with respect to the Z-shaped shaft connected to the rotational shaft rotatable about the rotational axis. The Z-shaped shaft is supported so as to be rotatable about the tilt axis, and a plurality of arms extend radially from the tilt member, and the tilt side connecting member is coupled to the tip of each arm, A reciprocating connection member is connected to a plurality of reciprocating members (output pistons, etc.) that can reciprocate in the direction of the rotation axis via reciprocating connection members (piston rods, etc.), and is inclined with respect to the reciprocating connection members. The side connecting member is slidably engaged. Then, when the inclined side connecting member performs the rotating razor motion, the rotational motion of the rotating shaft and the linear reciprocating motion of the plurality of reciprocating members are converted.
JP-A-11-343923

  However, this causes the following problems because the inclined side connecting member slides with respect to the reciprocating side connecting member each time the inclined side connecting member performs a rotating razor movement.

  First, sliding friction is generated by the sliding of the inclined side connecting member with respect to the reciprocating side connecting member, so that the durability of the rotary motion / linear reciprocating motion conversion device is insufficient and is easily broken.

  Secondly, energy loss occurs due to sliding friction between the inclined side connecting member and the reciprocating side connecting member, so that the conversion efficiency of the rotary motion / linear reciprocating motion conversion device is lowered.

  In view of such circumstances, an object of the present invention is to provide a rotary motion / linear reciprocating motion conversion device having high durability and robustness and high conversion efficiency.

  In order to achieve this object, the invention according to claim 1 has a rotating shaft that is rotatable about a rotating axis, and is provided along an inclined axis that is inclined with respect to the rotating axis. And a Z-shaped shaft comprising a pair of connecting shaft portions connected to both ends of the inclined shaft portion is coupled to the rotating shaft, and the inclined member rotates around the rotating axis on the inclined shaft portion of the Z-shaped shaft. It is supported in a constrained manner so as to be rotatable about the tilt axis, and a plurality of arms are provided on the tilt member so as to extend radially from the intersection of the rotation axis and the tilt axis. Each of the reciprocating members is provided with an inclined side connecting member at the tip, and has a plurality of reciprocating members that can reciprocate in the direction of the rotation axis. Tip of connecting member The reciprocating side connecting members are respectively provided on the rotary shafts, and each of them has an eight-letter motion as viewed from a linear direction perpendicular to the rotational axis and passing through the center point of the inclined side connecting members and is a circular motion as viewed from the rotational axis direction. A rotary motion / linear reciprocating motion conversion device that bidirectionally converts the rotational motion of the rotary shaft and the linear reciprocating motion of the reciprocating member by causing each inclined side connecting member to perform a sliding motion in order, Each arm is supported so as to be rotatable about the axis of the arm relative to the inclined member, and each inclined side connecting member is orthogonal to the axis of the arm provided with the inclined side connecting member The inclined side connecting members and the reciprocating side connecting members are supported by a rotational slashing motion of the inclined side connecting members and a linear reciprocating motion of the reciprocating side connecting members. both Characterized through the eccentric shaft that was rotated motion-linear reciprocating motion conversion device are connected to each other so as to be converted to.

  The invention according to claim 2 is characterized in that, in addition to the configuration according to claim 1, the eccentric shaft is rotatably supported with respect to the inclined side connecting member and the reciprocating side connecting member. .

  According to a third aspect of the present invention, in addition to the configuration according to the first or second aspect, an even number of the arms are arranged at equiangular intervals, and the arms facing each other among these arms are integrally connected to each other. Thus, a plurality of arm connecting bodies are formed, and these arm connecting bodies are independently rotatable with respect to the inclined member without interfering with each other.

  In addition to the structure in any one of Claims 1 thru | or 3, the invention of Claim 4 is provided with the linear reciprocation support member which guides the said reciprocation connection member to the moving direction of the said reciprocation member. It is characterized by that.

  The invention described in claim 5 is characterized in that the rotary motion / linear reciprocating motion conversion device according to any one of claims 1 to 4 is incorporated.

  According to the first aspect of the present invention, when the inclined side connecting member performs the rotating lashing motion, only rolling friction is generated between the inclined side connecting member and the reciprocating side connecting member. A rotary motion / linear reciprocating motion conversion device with high conversion efficiency can be provided.

  According to invention of Claim 2, the eccentric shaft which connects each inclination side connection member and each reciprocation side connection member is rotatable with respect to these inclination side connection members and a reciprocation side connection member. Therefore, it is possible to smoothly perform bidirectional conversion between the rotating razor movement of the inclined side connecting member and the linear reciprocating movement of the reciprocating side connecting member.

  According to the third aspect of the present invention, a multi-cylinder external combustion engine can be realized at low cost.

  According to the invention described in claim 4, since the reciprocating connection member is guided in the moving direction of the reciprocating member, the reciprocating side connecting member can be linearly reciprocated with high accuracy.

  According to the invention described in claim 5, it is possible to provide an engine having the same effects as those of claims 1-4.

Embodiments of the present invention will be described below.
Embodiment 1 of the Invention

  1 to 5 show a first embodiment of the present invention.

  First, the configuration will be described.

  As shown in FIGS. 1 and 2, the external combustion engine 1 has four cylinder assemblies 4 arranged on the circumference at equal angular intervals (90 ° intervals). Each cylinder assembly 4 has a cylindrical cylinder 2, and an output piston (reciprocating member) 3 is fitted in each cylinder 2 so as to be slidable in the vertical direction. Below these output pistons 3, an output shaft 27 is arranged in the direction of arrow N about the rotation axis Z 1 in the vertical direction (that is, the movement direction of the output piston 3) via the rotary motion / linear reciprocating motion conversion device 22. The rotary motion / linear reciprocating motion conversion device 22 is rotatably connected to four piston rods (reciprocating connecting members) 5, four reciprocating side connecting members 30, a rotating shaft 29, a Z-shaped shaft 23, The inclined member 25, the four arms 26, and the four inclined side connecting members 31 are configured.

  Here, as shown in FIGS. 2 to 4, each piston rod 5 is suspended from each output piston 3, and a reciprocating side connecting member 30 is attached to the tip of each piston rod 5. Yes. Further, at a position surrounded by these piston rods 5, a rotating shaft 29 is supported so as to be rotatable in the direction of arrow N about the rotating axis Z 1, and a Z-shaped shaft 23 is disposed below the rotating shaft 29. It is connected. The Z-shaped shaft 23 has an inclined shaft portion 23a provided along an inclined axis Z2 inclined by a predetermined inclination angle θ (for example, θ = 20 to 25 °) with respect to the rotation axis Z1. Since the pair of connecting shaft portions 23b and 23b are horizontally connected to both ends of the inclined shaft portion 23a in parallel with each other, they are formed in a Z shape as a whole.

  Further, as shown in FIGS. 2 and 3, the inclined shaft portion 23 a of the Z-shaped shaft 23 is rotatable about the inclined axis Z <b> 2 in such a manner that the inclined member 25 is restricted from rotating about the rotational axis Z <b> 1. It is supported by. On the side surface of the inclined member 25, four arms 26 are arranged at equiangular intervals (that is, 90 ° intervals) corresponding to the arrangement of the four output pistons 3, and the rotation axis Z1 and the inclination axis Z2 As shown in FIG. 1, each arm 26 is supported by the inclined member 25 via a bearing 33 so as to be rotatable around the axis of the arm 26. ing. As shown in FIGS. 3 and 4, an inclined side connecting member 31 is provided at the tip of each arm 26 via a bearing 34, as shown in FIGS. 3 and 4, and an axis Z3 orthogonal to a plane including the axis of the arm 26 and the rotation axis Z1. It is supported so that it can rotate freely.

  Here, as shown in FIG. 4, each inclined-side connecting member 31 and each reciprocating-side connecting member 30 are configured so that the rotational razor movement of the inclined-side connecting member 31 and the linear reciprocating movement of the reciprocating-side connecting member 30 are bidirectional. Are connected to each other via a pair of eccentric shafts 32 (32A, 32B). That is, as shown in FIG. 5, each of the eccentric shafts 32 is integrally formed with a cylindrical first shaft body 32a and a second shaft body 32b having the same shape and size that are eccentric from each other by a predetermined eccentricity L1. It has the structure connected to. One eccentric shaft 32A is mounted between the upper part of each reciprocating side connecting member 30 and the upper part of each inclined side connecting member 31, and the first shaft body 32a is a bearing of this eccentric shaft 32A. The second shaft body 32 b is rotatably supported by the inclined side connecting member 31 via a bearing 36 while being rotatably supported by the reciprocating side connecting member 30 via 35. The other eccentric shaft 32B is mounted between the lower portion of each reciprocating side connecting member 30 and the lower portion of each inclined side connecting member 31, and this eccentric shaft 32B has a first shaft 32a as a bearing. The second shaft body 32 b is rotatably supported by the inclined side connecting member 31 via a bearing 36 while being rotatably supported by the reciprocating side connecting member 30 via 35. Further, the eccentric amount L1 of the eccentric shafts 32A and 32B is equal to the radius of a circle which is a locus when the rotational shave motion of the inclined side connecting member 31 is projected on a plane perpendicular to the rotational axis Z. For this reason, the rotational razor movement of the inclined side connecting member 31 and the linear reciprocating movement of the reciprocating side connecting member 30 are converted in both directions.

  As shown in FIG. 4, each piston rod 5 is provided with a linear reciprocating motion support member 40, and the linear reciprocating motion support member 40 moves the piston rod 5 in the vertical direction, that is, the movement of the output piston 3. It is comprised from the reciprocating movement support member 41, the linear reciprocating motion roller 42, and the linear reciprocating motion guide 43 so that it can guide to a direction.

  Further, as shown in FIG. 3, an output shaft 27 is coupled to the lower side of the Z-shaped shaft 23 in the vertical direction along the rotation axis Z1.

  Further, as shown in FIG. 1, a steam heater 7 is attached to the upper side of each cylinder 2 so as to communicate with a working space (expansion / contraction space) 8 in the cylinder 2, and a burner (not shown). The steam heater 7 can be heated by applying a flame.

  Next, the operation will be described.

  Since the external combustion engine 1 has the above-described configuration, when the external combustion engine 1 is operated as a normal engine, that is, one that converts heat into power, four output pistons are described as described below. 3 is sequentially reciprocated linearly with an equal phase difference (that is, a phase difference of 90 °), thereby rotating the output shaft 27 in the direction of arrow N about the rotation axis Z1.

  That is, when each output piston 3 is at the top dead center, steam at a predetermined temperature (for example, about 450 ° C.) is sequentially supplied from the steam heaters 7 to the working spaces 8 in the four cylinders 2. As a result, the working space 8 in each cylinder 2 becomes high pressure, and each output piston 3 is pushed out in order and descends. And when each output piston 3 reaches a bottom dead center, the vapor | steam in the working space 8 in the four cylinders 2 will be discharge | released in order to air | atmosphere. As a result, the working space 8 in each cylinder 2 becomes low pressure, and each output piston 3 is pulled back and raised in order.

  When the four output pistons 3 are linearly reciprocated in this manner, the four piston rods 5 and the four reciprocating side connecting members 30 are also linearly reciprocated in sequence. As a result, the four inclined side connecting members 31 are moved up and down in order, and the four arms 26 are swung in order. Therefore, the inclined member 25 rotates once in the arrow N direction around the rotation axis Z1. Accordingly, the Z-shaped shaft 23 rotates once in the direction of arrow N about the rotation axis Z1, and the rotation shaft 29 also rotates once in the direction of arrow N about the rotation axis Z1. As a result, the output shaft 27 rotates once in the arrow N direction around the rotation axis Z1.

  In this way, the linear reciprocating motion of the four output pistons 3 is converted into the rotational motion of the output shaft 27.

  Here, one cycle as the engine of the external combustion engine 1 is completed. By repeating such a cycle, the four output pistons 3 sequentially repeat linear reciprocating motion, and the output shaft 27 repeats rotational motion, so that the external combustion engine 1 operates as a normal engine.

  At this time, since each piston rod 5 is provided with the linear reciprocating motion support member 40 as described above, the piston rod 5 is guided in the vertical direction. Therefore, the reciprocating side connecting member 30 can be linearly reciprocated with high accuracy.

  On the other hand, the swinging motions of the four arms 26 have a phase difference of 90 ° from each other. For example, when one arm 26 is located at the center point, the arm 26 in the previous stage has the lowest point. At the same time, the subsequent arm 26 is positioned at the uppermost point. Therefore, each inclined side connecting member 31 performs a rotating razor motion. This rotational razor movement is an eight-character movement as viewed from the straight line direction perpendicular to the rotation axis Z1 and passing through the center point of the inclined side connecting member 31, and is a circular movement as viewed from the direction of the rotation axis Z1.

  Then, each reciprocating side connecting member 30 performs a linear reciprocating motion, whereas each inclined side connecting member 31 performs a rotating slashing motion. Are connected to each other via the eccentric shaft 32 as described above, and the eccentric shaft 32 is rotatable with respect to the reciprocating side connecting member 30 and the inclined side connecting member 31, so that each reciprocating side is The linear reciprocating motion of the connecting member 30 is smoothly converted into the rotating razor motion of each inclined side connecting member 31.

  At this time, since only rolling friction is generated between the reciprocating side connecting member 30 and the inclined side connecting member 31, the rotary motion / linear reciprocating motion conversion device 22 is highly durable and robust, and also has a conversion efficiency. Is expensive.

  Further, since the eccentric amount L1 of the eccentric shafts 32A and 32B is equal to the radius of a circle which is a locus when the rotational shave motion of the inclined side connecting member 31 is projected onto a plane perpendicular to the rotational axis Z, Conversion from the linear reciprocating motion of the reciprocating side connecting member 30 to the rotating razor motion of each inclined side connecting member 31 can be performed more smoothly.

  Furthermore, the angle formed by the inclined side connecting member 31 and the arm 26 changes with the rotational shave movement of the inclined side connecting member 31, but both are rotatably connected via the bearing 34. Therefore, the rotating razor movement of the inclined side connecting member 31 is performed without any trouble.

  On the contrary, when operating the external combustion engine 1 as a refrigerator, that is, for converting power into heat, as described below, the output shaft 27 is rotated about the rotation axis Z1 in the direction of arrow N. Thus, the four output pistons 3 are linearly reciprocated in order with an equal phase difference (that is, a phase difference of 90 °).

  That is, the output shaft 27 is rotated once in the arrow N direction around the rotation axis Z1. Then, the rotation shaft 29 makes one rotation in the arrow N direction around the rotation axis Z1, and accordingly, the Z-type shaft 23 also makes one rotation in the arrow N direction around the rotation axis Z1. At this time, since the inclined member 25 is constrained from rotating about the rotation axis Z1, the attachment portions of the four arms 26 sequentially rotate and shave with equal phase difference (90 ° phase difference). . As a result, the four arms 26 oscillate in order with an equal phase difference (90 ° phase difference), and the four inclined side connecting members 31 rotate in order with an equal phase difference (90 ° phase difference). Do one scouring exercise. Then, the four reciprocating side connection members 30 sequentially reciprocate linearly, and the four piston rods 5 sequentially perform the linear reciprocating motion once. As a result, the four output pistons 3 reciprocate linearly in sequence, the working space 8 in the cylinder 2 contracts when moving from the bottom dead center to the top dead center, and the cylinder when moving from the top dead center to the bottom dead center. The working space 8 in 2 expands.

  In this way, the rotational movement of the output shaft 27 is converted into the linear reciprocating movement of the four output pistons 3.

  Here, one cycle as the refrigerator of the external combustion engine 1 is completed. By repeating such a cycle, the output shaft 27 repeats the rotational motion, and the four output pistons 3 sequentially repeat the linear reciprocating motion, so that the external combustion engine 1 operates as a refrigerator.

  Also at this time, the reciprocating side connecting member 30 can be accurately reciprocated linearly by the linear reciprocating support member 40 as well as when the external combustion engine 1 is operated as a normal engine. Since only rolling friction occurs between the reciprocating side connecting member 30, the rotary / linear reciprocating motion conversion device 22 is highly durable and robust, and has high conversion efficiency.

  Further, for the same reason as when the external combustion engine 1 is operated as a normal engine, the rotational slashing motion of each inclined side connecting member 31 can be smoothly converted into the linear reciprocating motion of each reciprocating side connecting member 30. . In addition, the eccentric amount L1 of the eccentric shafts 32A and 32B is equal to the radius of the circle which is the locus when the rotational shave motion of the inclined side connecting member 31 is projected onto a plane perpendicular to the rotational axis Z. Conversion from the rotational razor movement of the inclined side connecting member 31 to the linear reciprocating movement of each reciprocating side connecting member 30 can be performed more smoothly.

  Further, as the arm 26 swings, the angle formed by the arm 26 and the inclined side connecting member 31 changes. However, since both are rotatably connected via the bearing 34, the arm 26 The rocking motion is performed without any trouble.

Further, in the external combustion engine 1, whether it is operated as a normal engine or as a refrigerator, the inclined side connecting member 31 performs a rotating razor motion, and supports the inclined side connecting member 31. Since the arm 26 is rotatably supported by the inclined member 25, the inclined side connecting member 31 does not need to be a sphere, and the degree of freedom in design is increased when determining the shape of the inclined side connecting member 31.
[Other Embodiments of the Invention]

  In the first embodiment described above, the case where the output piston 3 is used as the reciprocating member has been described. However, a reciprocating member other than the output piston 3 (for example, a bellows or a diaphragm) can be substituted.

  In the first embodiment described above, the case where the piston rod 5 is used as the reciprocating connection member has been described. However, a reciprocating connection member other than the piston rod 5 (for example, a linear guide or a linear motion magnet guide) is substituted. You can also.

  Further, in the first embodiment described above, the rotational motion / linear reciprocating motion conversion device 22 in which the four arms 26 are independently provided on the inclined member 25 has been described. However, an even number (for example, four, six) is described. , 8) arms 26 facing each other are integrally connected to form a plurality of (for example, two, three, four) arm coupling bodies, and these arm coupling bodies are It is also possible to make the arm 26 swingable within the range of the inclination angle by being configured to be rotatable with respect to the inclined member 25 independently without interfering with each other. In this case, since the arm 26 is increased in rigidity by the connection, the rotary motion / linear reciprocating motion conversion device 22 can be made more robust. In addition, even if the two arm coupling bodies rotate, there is no possibility that they interfere with each other, so that the motion conversion operation by the rotary motion / linear reciprocating motion conversion device 22 can be performed without any trouble.

  In the first embodiment described above, the 4-cylinder external combustion engine 1 has been described. However, the number of cylinders is not limited as long as it is plural. For example, the present invention can be similarly applied to the external combustion engine 1 having two or three cylinders. Furthermore, the present invention can be similarly applied not only to the external combustion engine 1 but also to an internal combustion engine such as a gasoline engine, a diesel engine, or a gas turbine engine.

  In the above-described first embodiment, the rotary motion / linear reciprocating motion conversion device 22 in which the pair of eccentric shafts 32 is interposed between each reciprocating side connecting member 30 and each inclined side connecting member 31 has been described. Each reciprocating side connecting member 30 and each inclined side connecting member 31 may be connected by only one eccentric shaft 32.

  The present invention can be widely applied to industries using various engines regardless of whether they are external combustion engines or internal combustion engines.

It is sectional drawing which shows the external combustion engine which concerns on Embodiment 1 of this invention. FIG. 2 is a perspective view of the rotary motion / linear reciprocating motion conversion device according to the first embodiment. It is a figure which shows the rotational movement / linear reciprocating motion conversion apparatus which concerns on the same Embodiment 1, Comprising: (a) is the front view, (b) is sectional drawing by the DD line of (a). It is a front view which shows the linear rotor vicinity which concerns on the same Embodiment 1. FIG. It is a figure which shows the eccentric shaft which concerns on the same Embodiment 1, Comprising: (a) is the front view, (b) is the bottom view.

Explanation of symbols

1 …… External combustion engine (engine)
2 …… Cylinder 3 …… Output piston (reciprocating member)
4 .... Cylinder assembly 5 .... Piston rod (reciprocating connecting member)
7 …… Steam heater 22 …… Rotary motion / linear reciprocating motion conversion device 23 …… Z type shaft 23a …… Inclined shaft portion 23b …… Connecting shaft portion 25 …… Inclined member 26 …… Arm 27 …… Output shaft 29 …… Rotating shaft 30 …… Reciprocating side connecting member 31 …… Inclined side connecting member 32 …… Eccentric shaft 32a …… First shaft body 32b …… Second shaft body 33, 34, 35, 36 …… Bearing 40 …… Linear reciprocating support member 41 …… Reciprocating support member 42 …… Linear reciprocating roller 43 …… Linear reciprocating guide L1 …… Eccentricity Z1 …… Rotation axis Z2 …… Inclined axis Z3 …… Axis center

Claims (5)

It has a rotation axis that can rotate around the rotation axis,
A Z-shaped shaft comprising an inclined shaft portion provided along an inclined axis inclined with respect to the rotational axis and a pair of connecting shaft portions connected to both ends of the inclined shaft portion is coupled to the rotational shaft,
An inclined member is supported by the inclined shaft portion of the Z-shaped shaft so as to be rotatable about the inclined axis in a form constrained to rotate about the rotational axis,
The inclined member is provided with a plurality of arms extending radially from the intersection of the rotation axis and the inclination axis,
An inclined side connecting member is provided at the tip of each arm,
A plurality of reciprocating members capable of reciprocating in the rotational axis direction;
Reciprocating connection members are connected to the reciprocating members,
A reciprocating side connecting member is provided at the tip of each reciprocating connecting member,
Each of the inclined side connecting members performs a rotary razor movement that is an eight-character movement as viewed from a linear direction perpendicular to the rotational axis and passing through the center point of the inclined side connecting member and a circular movement as viewed from the rotational axis direction. A rotary motion / linear reciprocating motion conversion device that bidirectionally converts the rotational motion of the rotary shaft and the linear reciprocating motion of the reciprocating member by performing in order,
Each of the arms is supported so as to be rotatable around the axis of the arm with respect to the inclined member,
Each of the inclined side connecting members is supported rotatably about an axis perpendicular to the axis of the arm provided with the inclined side connecting member,
Each of the inclined side connecting members and each of the reciprocating side connecting members are arranged via an eccentric shaft so that the rotational razor movement of the inclined side connecting member and the linear reciprocating movement of the reciprocating side connecting member are bidirectionally converted. Are connected to each other.   2. The rotational motion / linear reciprocating motion conversion device according to claim 1, wherein the eccentric shaft is rotatably supported with respect to the inclined side connecting member and the reciprocating side connecting member. The arms are arranged in even numbers at equiangular intervals from each other,
Arms facing each other among these arms are integrally connected to form a plurality of arm connected bodies,
The rotary motion / linear reciprocating motion conversion device according to claim 1, wherein the arm coupling bodies are independently rotatable with respect to the inclined member without interfering with each other.   4. The rotary motion / linear reciprocating motion conversion device according to claim 1, further comprising a linear reciprocating motion supporting member for guiding the reciprocating connecting member in a moving direction of the reciprocating member. .   An engine comprising the rotary motion / linear reciprocating motion conversion device according to any one of claims 1 to 4.

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