JP2016191337A - Starter for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a size of a starter for an internal combustion engine in a direction along an axial line of a crankshaft, in the starter for the internal combustion engine which imparts a start rotating force to the crankshaft of the internal combustion engine according to a turn operation of a kick pedal.SOLUTION: A driven gear 14 arranged at a fixed position is linked with and connected to a crankshaft 11, a drive gear 15 for rotationally driving the driven gear 14 according to a turn operation of a kick pedal 12 rotationally drives the driven gear 14 while moving to a position which is engaged with the driven gear 14 from a standby position according to a pedal-in operation of the kick pedal 12 from a non-operation position by the action of a link mechanism 16, and when an operation force to the kick pedal 12 is released after the rotation of the driven gear 14 accompanied by a start of an internal combustion engine E, the drive gear 15 is returned to a standby position while being disenabled in engagement with the driven gear 14.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a starting device for an internal combustion engine in which a starting rotational power is applied to a crankshaft (11) of an internal combustion engine (E) in accordance with a turning operation of a kick pedal (12).

  Between a crankshaft and a kick shaft that constitutes a part of a transmission case that accommodates a V-belt type continuously variable transmission and rotatably penetrates a case cover that covers the continuously variable transmission from the outside, A power unit in which a kick-type starting mechanism that rotates a crankshaft by rotating a kick shaft is provided is known from Patent Document 1.

JP-A-8-170574

  However, in the technique disclosed in Patent Document 1, the crankshaft is started by the driving side ratchet operating in the axial direction and engaging the driven side ratchet fixed to the crankshaft by the rotation of the kick shaft. Therefore, it is necessary to secure a space necessary for the axial movement of the drive side ratchet, which increases the size of the crankshaft in the axial direction.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a starter for an internal combustion engine that can be miniaturized in a direction along the axis of the crankshaft.

  In order to achieve the above object, the present invention relates to a starter for an internal combustion engine in which a starting rotational power is applied to a crankshaft of an internal combustion engine in accordance with a turning operation of a kick pedal. A driven gear that is connected and disposed at a fixed position, a drive gear that rotationally drives the driven gear in response to a rotation operation of the kick pedal, and a drive gear that is operated in response to a depression operation from a non-operation position of the kick pedal. Is moved from a standby position to a position where it is engaged with the driven gear, and the driven gear is rotationally driven, and when the operating force to the kick pedal is released after the driven gear is rotated as the internal combustion engine starts, the drive gear is moved to the driven gear. Link mechanism that makes it possible to return to the standby position while disengaging The first comprising: a.

  According to the present invention, in addition to the configuration of the first feature, the link mechanism is capable of rotating around a first axis, and a first link arm whose one end is supported at a fixed position, and the kick pedal Is provided at one end and the other end of the first link arm is pivotable about the second axis so as to be connected to the intermediate portion, and the drive gear as a sector gear is around the third axis. A third link arm which is supported at one end so as to be able to rotate and is supported so as to be able to rotate around the fourth axis at an intermediate portion of the first link arm; and a direction in which the kick pedal is depressed A gear receiving portion extending from the other end portion of the second link arm so as to contact and support the first link arm, and the first link arm in a direction to return the kick pedal to the non-operation position side. A first elastic member and a second elastic member that urges the drive gear to abut against the gear receiving portion, and the first to fourth axes are set parallel to the axis of the crankshaft. The other end of the second link arm is connected to the third link arm so as to rotate the third link arm about the fourth axis in accordance with the rotation of the second link arm about the second axis, The second link arm rotates around the second axis by contacting the first link arm when the second link arm rotates around the second axis in response to the depression operation of the kick pedal. A first stopper for restricting the end is provided, and the third link arm is rotated about the fourth axis of the third link arm as the second link arm rotates about the second axis in response to the depression operation of the kick pedal. Rotation A second stopper that restricts the pivot end of the third link arm around the fourth axis by contacting the first link arm, and the first and second stoppers are in contact with the first link arm. The second feature is that the distance between the first and fourth axes and the distance between the third and fourth axes are set to be the same so that the first and third axes are coaxial.

  According to the above feature of the present invention, there is no member that moves in the direction along the axis of the crankshaft, and there is no need to secure a moving space in the direction along the axis of the crankshaft. Miniaturization is possible. Further, after the internal combustion engine is started, the drive gear does not mesh with the driven gear, and the starter does not increase the friction of the internal combustion engine.

It is a perspective view which shows the structure of a starting device. It is a perspective view which shows the structure of a starting device from the opposite side to FIG. It is a side view which shows sequentially the operation state of a starting device when a kick pedal is stepped on from a non-operation position. It is a side view which shows sequentially the operation state of the starting device in the state after starting of an internal combustion engine. It is a side view which shows sequentially the operation state of the starting device in the state where the input of the operating force to the kick pedal was released after the internal combustion engine was started.

  An embodiment of the present invention will be described with reference to the accompanying drawings. First, in FIGS. 1 and 2, a crankshaft 11 provided in an internal combustion engine E is started according to the present invention in accordance with a turning operation of a kick pedal 12. The starting rotational power is input by the device, and this starting device is linked to the crankshaft 11 and connected to the driven gear 14 arranged in a fixed position and according to the turning operation of the kick pedal 12. The drive gear 15 that rotationally drives the driven gear 14 and the drive gear 15 meshed with the driven gear 14 in response to a stepping operation from the non-operating position of the kick pedal 12 (the position shown in FIGS. 1 and 2). And a link mechanism 16 adapted to do so.

  The driven gear 14 is fixed to the crankshaft 11 in this embodiment. The drive gear 15 is a sector gear in this embodiment.

  The link mechanism 16 includes a first link arm 17, a second link arm 18 provided with the kick pedal 12 at one end thereof, and a drive gear 15 rotatably supported at one end and a first link arm. The third link arm 19 is supported by the middle portion of the first link arm 17 so as to be rotatable, and the second link arm 18 is supported so as to contact and support the drive gear 15 from the stepping operation direction 23 of the kick pedal 12. A gear receiving portion 20 extending from the end portion, a first elastic member 21 that urges the first link arm 17 in a direction to return the kick pedal 12 to the non-operation position side, and the drive gear 15 to the gear. And a second elastic member 22 that is urged to rotate in a direction to contact the receiving portion 20.

  One end of the first link arm 17 is supported at a fixed position of the internal combustion engine E via a first shaft 24 having a first axis C1 parallel to the rotation axis of the crankshaft 11, and the first axis It can be rotated around C1. The other end of the first link arm 17 is rotatably connected to an intermediate portion of the second link arm 18 via a second shaft 25 having a second axis C1 parallel to the first axis C1. The drive gear 15 is rotatably supported at one end of the third link arm 19 via a third shaft 26 having a third axis C3 parallel to the first and second axes C1 and C2.

  The middle portion of the third link arm 19 is rotatably supported by the middle portion of the first link arm 17 via a fourth shaft 27 having a fourth axis C4 parallel to the first to third axes C1 to C3. The distance between the first and fourth axes C1 and C4 is set to be the same as the distance between the third and fourth axes C3 and C4.

  The other end of the second link arm 18 rotates the third link arm 19 about the fourth axis C in accordance with the rotation of the second link arm 18 about the second axis C2. 19 and the third link arm 19 has a long hole 28 extending in the direction connecting the third and fourth axes C3 and C4 at a position where the fourth shaft 27 is sandwiched between the third shaft 26 and the fourth shaft 27. At the other end of the second link arm 18 formed, a guide pin 29 inserted through the long hole 28 is provided.

  The gear receiving portion 20 is in contact with the first link arm 17 when the second link arm 18 is rotated about the second axis C2 according to the depression operation of the kick pedal 12, so that the gear receiving portion 20 is rotated about the second axis C2. A first stopper 31 for restricting the rotation end of the second link arm 18 is provided, and the third link arm 19 is provided around the second axis C2 of the second link arm 18 according to the depression operation of the kick pedal 12. A second end of the third link arm 19 around the fourth axis C4 is regulated by contacting the first link arm 17 when the third link arm 19 rotates around the fourth axis C4. A stopper 32 is provided.

  In such a starting device, as shown in FIG. 3A, when the kick pedal 12 is in the non-operation position, the link mechanism 16 waits for the drive gear 15 to disengage from the driven gear 14. In this state, when the kick pedal 12 is depressed and rotated in the depressing operation direction from this state, the second link arm 18 rotates about the second axis C2 as shown in FIG. Then, the first stopper 31 abuts on the first link arm 17, and the second link 32 of the third link arm 19 that is driven to rotate around the fourth axis C 4 by the second link arm 18 is the first link arm 17. The first axis C1 and the third axis C3 are coaxial. Therefore, when the kick pedal 12 is further depressed and rotated in the depression operation direction, as shown in FIG. 3C, the first, second, and third link arms 17, 18, 19 are integrated into the first. And the drive gear 15 meshes with the driven gear 14 to rotationally drive the driven gear 14, and the starting rotational power is applied to the crankshaft 12. It will be.

  When the internal combustion engine E is started by inputting the starting rotational power to the crankshaft 11, as shown in FIG. 4A, the drive gear 15 is engaged with the driven gear 14 as shown in FIG. 4B. In addition, the drive gear 15 is bounced away from the gear receiving portion 20 by the driven gear 14 whose rotational speed is increased. At this time, the power from the internal combustion engine E is not transmitted to the kick pedal 12.

  Next, when the operation force input to the kick pedal 12 is released, as shown in FIG. 5A, the drive gear 15 is rotated around the third axis C3 by the direction indicated by the arrow 33 by the elastic biasing force of the second elastic member 22. And the second link arm 18 is rotated around the second axis C2 in the direction indicated by the arrow 34. As a result, the third link arm 19 rotates about the fourth axis C4 in the direction indicated by the arrow 35, and the third axis C3 moves to the side farther from the driven gear 14 than the first axis C1.

  Next, due to the elastic biasing force of the first elastic member 21, the first, second and third link arms 17, 18, 19 are moved around the first axis C1 as shown by the arrow 36 in FIG. 5B. In this case, the drive gear 15 returns to the standby position so as not to mesh with the driven gear 14.

  That is, the link mechanism 16 rotationally drives the driven gear 14 while moving the drive gear 15 from a standby position to a position meshing with the driven gear 14 in response to an operation of depressing the kick pedal 12 from a non-operating position, and also performs internal combustion. When the operating force applied to the kick pedal 12 is released after the driven gear 14 is rotated as the engine E starts, the drive gear 15 is returned to the standby position while disengaging the driven gear 14.

  As described above, the starting device according to the present invention has no member that moves in the direction along the axis of the crankshaft 11, and it is not necessary to secure a moving space in the direction along the axis of the crankshaft 11. It is possible to reduce the size in the direction along the line. Further, after the internal combustion engine E is started, the drive gear 15 is not engaged with the driven gear 14, and the starter does not increase the friction of the internal combustion engine E.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the present invention described in the claims. Is possible.

11 ... crankshaft 12 ... kick pedal 14 ... driven gear 15 ... drive gear 16 ... link mechanism 17 ... first link arm 18 ... second link arm 19 ... first 3 link arm 20 ... gear receiving portion 21 ... first elastic member 22 ... second elastic member 31 ... first stopper 32 ... second stopper C1 ... first axis C2 ... Second axis C3 ... third axis C4 ... fourth axis E ... internal combustion engine

  The present invention relates to a starting device for an internal combustion engine in which a starting rotational power is applied to a crankshaft (11) of an internal combustion engine (E) in accordance with a turning operation of a kick pedal (12).

  Between a crankshaft and a kick shaft that constitutes a part of a transmission case that accommodates a V-belt type continuously variable transmission and rotatably penetrates a case cover that covers the continuously variable transmission from the outside, A power unit in which a kick-type starting mechanism that rotates a crankshaft by rotating a kick shaft is provided is known from Patent Document 1.

JP-A-8-170574

  However, in the technique disclosed in Patent Document 1, the crankshaft is started by the driving side ratchet operating in the axial direction and engaging the driven side ratchet fixed to the crankshaft by the rotation of the kick shaft. Therefore, it is necessary to secure a space necessary for the axial movement of the drive side ratchet, which increases the size of the crankshaft in the axial direction.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a starter for an internal combustion engine that can be miniaturized in a direction along the axis of the crankshaft.

In order to achieve the above object, the present invention relates to a starter for an internal combustion engine in which a starting rotational power is applied to a crankshaft of an internal combustion engine in accordance with a turning operation of a kick pedal. A driven gear that is connected and disposed at a fixed position, a drive gear that rotationally drives the driven gear in response to a rotation operation of the kick pedal, and a drive gear that is operated in response to a depression operation from a non-operation position of the kick pedal. Is driven in rotation in a direction perpendicular to the axis of the driven gear from a standby position to a position where the driven gear is engaged with the driven gear. When the drive gear is released, the drive gear cannot be engaged with the driven gear. The first; and a link mechanism so as to return to the standby position.

According to the present invention, in addition to the configuration of the first feature, the link mechanism is capable of rotating around a first axis, and a first link arm whose one end is supported at a fixed position, and the kick pedal Is provided at one end and the other end of the first link arm is pivotable about the second axis so as to be connected to the intermediate portion, and the drive gear as a sector gear is around the third axis. A third link arm which is supported at one end so as to be able to rotate and is supported so as to be able to rotate around the fourth axis at an intermediate portion of the first link arm; and a direction in which the kick pedal is depressed A gear receiving portion extending from the other end portion of the second link arm so as to contact and support the first link arm, and the first link arm in a direction to return the kick pedal to the non-operation position side. A first elastic member and a second elastic member that urges the drive gear to abut against the gear receiving portion, and the first to fourth axes are set parallel to the axis of the crankshaft. The other end of the second link arm is connected to the third link arm so as to rotate the third link arm about the fourth axis in accordance with the rotation of the second link arm about the second axis, The second link arm rotates around the second axis by contacting the first link arm when the second link arm rotates around the second axis in response to the depression operation of the kick pedal. A first stopper for restricting the end is provided, and the third link arm is rotated about the fourth axis of the third link arm as the second link arm rotates about the second axis in response to the depression operation of the kick pedal. Rotation The second stopper is provided by abutting the second link arm to restrict the third rotating end of the link arm about a fourth axis, the first scan stopper contacts and the second stopper to the first link arm to the The distance between the first and fourth axes and the distance between the third and fourth axes are set to be the same so that the first and third axes are coaxial with each other in contact with the second link arm. Is the second feature.

  According to the above feature of the present invention, there is no member that moves in the direction along the axis of the crankshaft, and there is no need to secure a moving space in the direction along the axis of the crankshaft. Miniaturization is possible. Further, after the internal combustion engine is started, the drive gear does not mesh with the driven gear, and the starter does not increase the friction of the internal combustion engine.

It is a perspective view which shows the structure of a starting device. It is a perspective view which shows the structure of a starting device from the opposite side to FIG. It is a side view which shows sequentially the operation state of a starting device when a kick pedal is stepped on from a non-operation position. It is a side view which shows sequentially the operation state of the starting device in the state after starting of an internal combustion engine. It is a side view which shows sequentially the operation state of the starting device in the state where the input of the operating force to the kick pedal was released after the internal combustion engine was started.

  An embodiment of the present invention will be described with reference to the accompanying drawings. First, in FIGS. 1 and 2, a crankshaft 11 provided in an internal combustion engine E is started according to the present invention in accordance with a turning operation of a kick pedal 12. The starting rotational power is input by the device, and this starting device is linked to the crankshaft 11 and connected to the driven gear 14 arranged in a fixed position and according to the turning operation of the kick pedal 12. The drive gear 15 that rotationally drives the driven gear 14 and the drive gear 15 meshed with the driven gear 14 in response to a stepping operation from the non-operating position of the kick pedal 12 (the position shown in FIGS. 1 and 2). And a link mechanism 16 adapted to do so.

  The driven gear 14 is fixed to the crankshaft 11 in this embodiment. The drive gear 15 is a sector gear in this embodiment.

  The link mechanism 16 includes a first link arm 17, a second link arm 18 provided with the kick pedal 12 at one end thereof, and a drive gear 15 rotatably supported at one end and a first link arm. The third link arm 19 is supported by the middle portion of the first link arm 17 so as to be rotatable, and the second link arm 18 is supported so as to contact and support the drive gear 15 from the stepping operation direction 23 of the kick pedal 12. A gear receiving portion 20 extending from the end portion, a first elastic member 21 that urges the first link arm 17 in a direction to return the kick pedal 12 to the non-operation position side, and the drive gear 15 to the gear. And a second elastic member 22 that is urged to rotate in a direction to contact the receiving portion 20.

  One end of the first link arm 17 is supported at a fixed position of the internal combustion engine E via a first shaft 24 having a first axis C1 parallel to the rotation axis of the crankshaft 11, and the first axis It can be rotated around C1. The other end of the first link arm 17 is rotatably connected to an intermediate portion of the second link arm 18 via a second shaft 25 having a second axis C1 parallel to the first axis C1. The drive gear 15 is rotatably supported at one end of the third link arm 19 via a third shaft 26 having a third axis C3 parallel to the first and second axes C1 and C2.

  The middle portion of the third link arm 19 is rotatably supported by the middle portion of the first link arm 17 via a fourth shaft 27 having a fourth axis C4 parallel to the first to third axes C1 to C3. The distance between the first and fourth axes C1 and C4 is set to be the same as the distance between the third and fourth axes C3 and C4.

  The other end of the second link arm 18 rotates the third link arm 19 about the fourth axis C in accordance with the rotation of the second link arm 18 about the second axis C2. 19 and the third link arm 19 has a long hole 28 extending in the direction connecting the third and fourth axes C3 and C4 at a position where the fourth shaft 27 is sandwiched between the third shaft 26 and the fourth shaft 27. At the other end of the second link arm 18 formed, a guide pin 29 inserted through the long hole 28 is provided.

The gear receiving portion 20 is in contact with the first link arm 17 when the second link arm 18 is rotated about the second axis C2 according to the depression operation of the kick pedal 12, so that the gear receiving portion 20 is rotated about the second axis C2. A first stopper 31 for restricting the rotation end of the second link arm 18 is provided, and the third link arm 19 is provided around the second axis C2 of the second link arm 18 according to the depression operation of the kick pedal 12. A third end of the third link arm 19 around the fourth axis C4 is regulated by contacting the second link arm 18 when the third link arm 19 rotates around the fourth axis C4. 2 stoppers 32 are provided.

In such a starting device, as shown in FIG. 3A, when the kick pedal 12 is in the non-operation position, the link mechanism 16 waits for the drive gear 15 to disengage from the driven gear 14. In this state, when the kick pedal 12 is depressed and rotated in the depressing operation direction from this state, the second link arm 18 rotates about the second axis C2 as shown in FIG. Then, the first stopper 31 contacts the first link arm 17 and the second stopper 32 of the third link arm 19 that is driven to rotate around the fourth axis C4 by the second link arm 18 is the second link arm 1. 8 , the first axis C1 and the third axis C3 are coaxial. Therefore, when the kick pedal 12 is further depressed and rotated in the depression operation direction, as shown in FIG. 3C, the first, second, and third link arms 17, 18, 19 are integrated into the first. And the drive gear 15 meshes with the driven gear 14 to rotationally drive the driven gear 14, and the starting rotational power is applied to the crankshaft 12. It will be.

  When the internal combustion engine E is started by inputting the starting rotational power to the crankshaft 11, as shown in FIG. 4A, the drive gear 15 is engaged with the driven gear 14 as shown in FIG. 4B. In addition, the drive gear 15 is bounced away from the gear receiving portion 20 by the driven gear 14 whose rotational speed is increased. At this time, the power from the internal combustion engine E is not transmitted to the kick pedal 12.

  Next, when the operation force input to the kick pedal 12 is released, as shown in FIG. 5A, the drive gear 15 is rotated around the third axis C3 by the direction indicated by the arrow 33 by the elastic biasing force of the second elastic member 22. And the second link arm 18 is rotated around the second axis C2 in the direction indicated by the arrow 34. As a result, the third link arm 19 rotates about the fourth axis C4 in the direction indicated by the arrow 35, and the third axis C3 moves to the side farther from the driven gear 14 than the first axis C1.

Next, the elastic force of the first elastic member 21 causes the first, second and third link arms 17 , 18 and 19 to move around the first axis C1 as shown by the arrow 36 in FIG. 5B. In this case, the drive gear 15 returns to the standby position so as not to mesh with the driven gear 14.

That is, the link mechanism 16 moves the drive gear 15 in a direction perpendicular to the axis of the driven gear 14 from a standby position to a position where the drive gear 15 meshes with the driven gear 14 in response to a depression operation of the kick pedal 12 from a non-operating position. While the driven gear 14 is driven to rotate and when the operating force to the kick pedal 12 is released after the driven gear 14 is rotated as the internal combustion engine E is started, the drive gear 15 is disengaged from the driven gear 14 while disengagement. It will return to the standby position.

  As described above, the starting device according to the present invention has no member that moves in the direction along the axis of the crankshaft 11, and it is not necessary to secure a moving space in the direction along the axis of the crankshaft 11. It is possible to reduce the size in the direction along the line. Further, after the internal combustion engine E is started, the drive gear 15 is not engaged with the driven gear 14, and the starter does not increase the friction of the internal combustion engine E.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the present invention described in the claims. Is possible.

11 ... crankshaft 12 ... kick pedal 14 ... driven gear 15 ... drive gear 16 ... link mechanism 17 ... first link arm 18 ... second link arm 19 ... first 3 link arm 20 ... gear receiving portion 21 ... first elastic member 22 ... second elastic member 31 ... first stopper 32 ... second stopper C1 ... first axis C2 ... Second axis C3 ... third axis C4 ... fourth axis E ... internal combustion engine

Claims (2)

  In a starter for an internal combustion engine in which a starting rotational power is applied to a crankshaft (11) of an internal combustion engine (E) in accordance with a turning operation of a kick pedal (12), the engine is interlocked with the crankshaft (11). A driven gear (14) that is connected and disposed at a fixed position, a drive gear (15) that rotationally drives the driven gear (14) in response to a turning operation of the kick pedal (12), and the kick pedal (12 ) Is driven to rotate while the drive gear (15) is moved from a standby position to a position meshing with the driven gear (14) in response to a depressing operation from the non-operating position, and the internal combustion engine (E When the operating force to the kick pedal (12) is released after the driven gear (14) rotates due to the start of (15) the driven gear (14) and the internal combustion engine starting device, characterized in that it comprises disabling a link mechanism so as to return to the standby position while the (16) the engagement.   The link mechanism (16) has a first link arm (17) whose one end is supported at a fixed position so that the link mechanism (16) can rotate about the first axis (C1), and the kick pedal (12) has one end. And the other end of the first link arm (17) is rotatable about the second axis (C2) and connected to the intermediate portion, and the drive gear as a sector gear. (15) is supported at one end so as to be able to turn around the third axis (C3), and supported around the fourth axis (C4) at the intermediate portion of the first link arm (17). The third link arm (19) and the other end of the second link arm (18) so as to abut and support the drive gear (15) from the stepping operation direction (23) of the kick pedal (12). Extend from Gear receiving portion (20), a first elastic member (21) for urging and urging the first link arm (17) in a direction to return the kick pedal (12) to the non-operation position side, and the drive gear ( 15) and a second elastic member (22) that urges the gear receiving portion (20) to abut against the gear receiving portion (20), and the first to fourth axes (C1 to C4) are connected to the crankshaft (11). The other end of the second link arm (18) moves the third link arm (19) in response to the rotation of the second link arm (18) around the second axis (C2). It is connected to the third link arm (19) so as to be rotated about the four axes (C4), and the second link arm (20) according to the depression operation of the kick pedal (12) is connected to the gear receiving portion (20). 18) when rotating around the second axis (C2). A first stopper (31) that restricts the rotational end of the second link arm (18) around the second axis (C2) by contacting the one link arm (17) is provided, and the third link arm (19) Further, the second link arm (18) around the fourth axis (C4) of the third link arm (19) accompanying the rotation around the second axis (C2) of the second link arm (18) according to the depression operation of the kick pedal (12). A second stopper (32) is provided for restricting the rotation end of the third link arm (19) around the fourth axis (C4) by contacting the first link arm (17) during rotation. In the state where the second stopper (31, 32) is in contact with the first link arm (17), the first and fourth axes (C1, C3) are arranged so that the first and third axes (C1, C3) are coaxial. Distance between C4) and third and fourth axes The starter for an internal combustion engine according to claim 1, wherein the distance between (C3, C4) is set to be the same.

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