JP6577881B2 - engine - Google Patents

Description

  The present invention relates to an engine provided with a partition wall that partitions an intake port.

  Conventionally, in order to generate a tumble (longitudinal vortex) flow in a combustion chamber, an engine having a partition wall partitioning an intake port into two flow paths (first flow path and second flow path) has been developed. A partition part is hold | maintained in an intake port by being inserted in the guide groove formed in the inner wall surface of an intake port along the flow direction of intake air from an upstream side (for example, patent document 1).

  In this engine, when the load is low and the intake flow rate is small, the opening of the first flow path partitioned by the partition wall is throttled by TGV (Tumble Generation Valve), so that the intake air flowing into the combustion chamber from the second flow path is reduced. The flow velocity can be increased and a tumble flow can be generated in the combustion chamber.

Japanese Patent No. 3694963

  However, since a connecting member such as an intake manifold is in contact with the opening on the upstream side of the intake port, if the portion inserted into the guide groove in the partition wall is longer than the guide groove, the intake port and the connecting member A gap is formed. Therefore, the guide groove into which the partition wall portion is inserted is formed such that the length in the flow direction is longer than the length in the flow direction of the portion inserted into the guide groove in the partition wall portion.

  In the engine configured as described above, the partition wall portion moves in the flow direction in the intake port due to the pulsation of the intake air or the vibration of the engine, and the intake port and the connecting member collide with the partition wall portion to be worn or damaged. There was a problem.

  Therefore, in view of such problems, an object of the present invention is to provide an engine capable of suppressing a collision between an intake port and a connecting member and a partition wall.

  In order to solve the above-mentioned problems, the engine of the present invention is inserted into a partition wall section for separating the intake port provided in the cylinder head and a guide groove formed in the intake port along the flow direction from the upstream opening. A stick portion for holding the partition wall portion at the intake port; and a plate portion provided at a position facing the guide groove of a connecting member connected to the cylinder head, the stick portion and the plate At least one of the parts is made of a ferromagnetic material, and the partition part is held in the intake port by a magnetic force acting between the stick part and the plate part.

  Further, one of the stick part and the plate part is made of a ferromagnetic material, the other of the stick part and the plate part is made of a paramagnetic material, and the stick part is caused by an attractive force acting between the plate part and the plate part. It is good to contact | abut to this plate part.

  Further, a second plate portion made of a ferromagnetic material is further provided on the downstream side of the guide groove, the stick portion and the plate portion are made of a ferromagnetic material, and the stick portion acts between the stick portion and the stick portion. It is good to hold | maintain between the said plate part and the said 2nd plate part by repulsive force.

  According to the present invention, it is possible to suppress the collision between the intake port and the connecting member and the partition wall.

It is a figure explaining the composition of an engine. It is a figure explaining the holding structure of a partition part. It is a figure explaining the holding structure of the partition part in other embodiment.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

  FIG. 1 is a diagram illustrating the configuration of the engine 1. As shown in FIG. 1, the engine 1 is provided with a cylinder block 2, a crankcase 3 integrally formed with the cylinder block 2, and a cylinder head 4 fixed to the upper part of the cylinder block 2.

  A cylinder bore 5 is formed in the cylinder block 2, and a piston 6 is slidably supported by the connecting rod 10 in the cylinder bore 5. In the engine 1, a space surrounded by the cylinder head 4, the cylinder bore 5, and the upper surface of the piston 6 is formed as the combustion chamber 7.

  In the engine 1, a crankshaft 9 is rotatably supported in a crank chamber 8 formed by the crankcase 3. The connecting rod 10 is rotatably supported by the crankshaft 9. Thereby, the piston 6 is connected to the crankshaft 9 via the connecting rod 10.

  An intake port 11 and an exhaust port 12 are formed in the cylinder head 4 so as to communicate with the combustion chamber 7. The intake port 11 has one opening formed on the upstream side of the intake air facing the intake manifold 18 and two openings formed on the downstream side facing the combustion chamber 7. Branches into two.

  The exhaust port 12 is formed with two openings on the upstream side of the exhaust facing the combustion chamber 7 and one opening on the downstream side facing the exhaust manifold 20. Are integrated into one.

  The tip of the intake valve 13 is located between the intake port 11 and the combustion chamber 7, and the tip of the exhaust valve 14 is located between the exhaust port 12 and the combustion chamber 7. An intake camshaft 15 to which a cam 15a is fixed and an exhaust camshaft 16 to which a cam 16a is fixed are provided in a cam chamber surrounded by the cylinder head 4 and a head cover (not shown). The intake camshaft 15 and the exhaust camshaft 16 are connected to the crankshaft 9 via a timing chain, and rotate as the crankshaft 9 rotates.

  The cam 15a is in contact with the other end of the intake valve 13, and is rotated by the intake camshaft 15 to move the intake valve 13 in the vertical direction in FIG. Thereby, the intake valve 13 opens and closes between the intake port 11 and the combustion chamber 7. The cam 16a is in contact with the other end of the exhaust valve 14, and is rotated by the exhaust camshaft 16 to move the exhaust valve 14 in the vertical direction in FIG. Thereby, the exhaust valve 14 opens and closes between the exhaust port 12 and the combustion chamber 7.

  The cylinder head 4 is provided with a spark plug (not shown) so that the tip is located in the combustion chamber 7, and the air-fuel mixture flowing into the combustion chamber 7 via the intake port 11 is a predetermined mixture. At this timing, the spark plug is ignited and burned. By such combustion, the piston 6 reciprocates in the cylinder bore 5, and the reciprocating motion is converted into rotational motion of the crankshaft 9 through the connecting rod 10.

  In the engine 1, an intake manifold 18 (connection member) is connected to a position facing the intake port 11 on the outer wall surface of the cylinder head 4. An intake passage 19 through which intake air is guided is formed inside the intake manifold 18, and the intake passage 19 and the intake port 11 communicate with each other. That is, the intake manifold 18 is connected to the cylinder head 4 so that the intake passage 19 communicates with the intake port 11.

  In the engine 1, the exhaust manifold 20 is connected to a position facing the exhaust port 12 on the outer wall surface of the cylinder head 4. An exhaust passage 21 through which exhaust is guided is formed inside the exhaust manifold 20, and the exhaust port 12 and the exhaust passage 21 are communicated with each other. That is, the exhaust manifold 20 is connected to the cylinder head 4 so that the exhaust passage 21 communicates with the exhaust port 12.

  A partition wall 22 is disposed inside the intake port 11. As will be described in detail later, the partition wall portion 22 is inserted into a guide groove 11 a (see FIG. 2) formed in the intake port 11 together with the stick portion 23, and the stick portion 23 is inserted into the plate portion 24 cast into the intake manifold 18. It is held against the intake port 11 in a contact state.

  The partition wall 22 extends from the intake flow path 19 to the intake port 11 along the flow direction of the intake air, so that a part of each of the intake flow path 19 and the intake port 11 extends in the vertical direction in FIG. The first flow path 25 and the second flow path 26 are formed by dividing. That is, a part of each of the intake flow path 19 and the intake port 11 is divided into the first flow path 25 and the second flow path 26 by the partition wall portion 22.

  Further, the partition wall portion 22 is arranged to be deviated downward in FIG. 1 from the center of the intake flow path 19 and the intake port 11, and is partitioned by the partition wall portion 22, and the upper first flow path 25 is The flow path is wider than the lower second flow path 26. A TGV (Tumble Generation Valve) 27 is disposed upstream of the partition wall portion 22 in the intake flow path 19 and varies the opening of the first flow path 25.

  As shown in FIG. 1, when the opening of the TGV 27 is minimized and the first flow path 25 is almost closed by the TGV 27, the intake air guided to the intake flow path 19 passes through the second flow path 26 and is in the combustion chamber. 7

  In the engine 1, when the load is small and the intake flow rate is small, the opening degree of the first flow path 25 is reduced, and most of the intake air is passed through the second flow path 26. In this way, in the engine 1, the intake air with an increased flow velocity is caused to flow into the combustion chamber 7, thereby generating a tumble flow indicated by the arrow line in the figure in the combustion chamber 7, realizing rapid combustion of the fuel, improving fuel consumption and combustion Improves stability.

  FIG. 2 is a view for explaining a holding structure of the partition wall 22. 2A is a view of the partition wall 22 as viewed from the first flow path 25 side, FIG. 2B is a cross-sectional view taken along the line XX in FIG. 2A, and FIG. FIG. 3 is a YY cross-sectional view in FIG. In FIG. 2A, the cylinder head 4 and the intake manifold 18 are shown in cross section.

  2 (a) and 2 (b), the cylinder head 4 is connected to the intake manifold 11 from the contact surface 4a to which the intake manifold 18 is connected (contacted) toward the downstream side in the flow direction. Guide grooves 11a having a substantially semicircular cross section are formed on both sides in the width direction. The width direction is a direction orthogonal to the flow direction among the directions in which the partition wall portions 22 extend.

  The partition wall portion 22 is made of a non-magnetic metal plate, and the main body portion 22a and the protruding portion 22b are integrally formed. The main body portion 22a has substantially the same length in the width direction as the intake port 11 and the intake flow path 19. The projecting portions 22b are provided at both ends in the width direction of the main body portion 22a and at substantially the center in the flow direction, the length in the flow direction is shorter than the guide groove 11a, and the length in the width direction is the guide groove. It is shorter than 11a.

  The stick portion 23 is made of a ferromagnetic resin (for example, a ferrite plastic magnet compound such as PA6 or PPS), and has a cross-section substantially matching the shape of the guide groove 11a so as to cover the protruding portion 22b of the partition wall portion 22. It is formed in a semicircular shape.

  Further, the stick portion 23 is formed so that the length in the flow direction is slightly shorter than the length of the guide groove 11a in the flow direction. Thereby, when the stick part 23 is inserted into the guide groove 11a, it is prevented from projecting to the intake manifold 18 side from the contact surface 4a due to manufacturing variation or the like.

  Moreover, the stick part 23 is being fixed with respect to the partition part 22 by press injection or insert molding. The partition wall 22 is inserted into the guide groove 11 a together with the stick portion 23.

  As shown in FIGS. 2 (a) and 2 (c), the intake manifold 18 is flush with the contact surface 18a connected (contacted) with the cylinder head 4, and the stick portion 23 (guide groove 11a). The plate portion 24 made of a paramagnetic metal piece is fixed by insert molding at positions opposite to each other (on both sides in the width direction).

  In the engine 1 having such a configuration, the intake manifold 18 is connected to the cylinder head 4 after the partition wall portion 22 (including the stick portion 23) is inserted into the guide groove 11 a of the cylinder head 4.

  At this time, the stick portion 23 is attracted to the plate portion 24 by the attractive force (magnetic force) acting between the stick portion 23 and the plate portion 24, and these attraction forces (with the stick portion 23 in contact with the plate portion 24 ( The partition wall 22 is held in the intake port 11 by the magnetic force.

  Therefore, in the engine 1, even if a force in the flow direction is applied to the partition wall portion 22 due to the pulsation of intake air or the vibration of the engine 1, the partition wall portion 22 moves in the flow direction due to the attractive force (magnetic force) of the plate portion 24 and the stick portion 23. Can be suppressed and prevented.

  Further, by suppressing and preventing the movement of the partition wall 22 in the flow direction, it is possible to suppress and prevent the partition wall 22 from colliding with the cylinder head 4 and the intake manifold 18. Degradation and damage can also be suppressed and prevented.

  Further, when the gasket is provided in order to suppress and prevent the movement of the partition wall 22 in the flow direction, there is a concern that the gasket may deteriorate due to blow-by gas or temperature change. The part 24 is not deteriorated by blow-by gas or temperature change.

  Further, since the stick portion 23 and the plate portion 24 are in contact with each other by attractive force (magnetic force), the stick portion 23 and the plate portion 24 can be easily separated when removing the partition wall portion 22 from the intake port 11.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to this embodiment. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Is done.

  For example, in the above-described embodiment, the partition wall portion 22 and the stick portion 23 are configured separately, but the partition wall portion 22 and the stick portion 23 may be integrally formed. In this case, at least the stick part 23 may be a ferromagnetic material.

  In the above-described embodiment, the stick portion 23 is made of a ferromagnetic material, and the plate portion 24 is made of a paramagnetic material. However, the present invention is not limited thereto, and one of the stick portion 23 and the plate portion 24 may be made of a ferromagnetic material, and the other of the stick portion 23 and the plate portion 24 may be made of a paramagnetic material.

  Further, both the stick portion 23 and the plate portion 24 are made of a ferromagnetic material, and when the stick portion 23 is inserted into the guide groove 11a and the intake manifold 18 is connected to the cylinder head 4, the stick portion 23 and the plate An attractive force may be applied to the portion 24.

  In the above-described embodiment, the intake manifold 18 is connected to the cylinder head 4, and the plate portion 24 is provided in the intake manifold 18. However, the present invention is not limited to this, and the other connecting member in which the intake passage is formed and the cylinder head 4 are connected so that the intake passage and the intake port 11 communicate with each other, and the plate portion 24 is connected to the other connecting member. May be provided.

  In the above-described embodiment, the stick portion 23 is brought into contact with the plate portion 24 by attractive force (magnetic force) to suppress or prevent the movement of the partition wall portion 22. The part 23 (partition wall 22) may be held so as not to collide with other members.

  FIG. 3 is a diagram illustrating a holding structure of the partition wall 22 in another embodiment. As shown in FIG. 3, for example, the stick portion 23 and the plate portion 24 are both made of a ferromagnetic material, and the second portion made of a ferromagnetic material at a position downstream of the guide groove 11 a and facing the stick portion 23. A plate portion 100 is provided. Then, the stick portion 23 may be held between the plate portion 24 and the second plate portion 100 by repulsive force. Thereby, even if the partition part 22 moves, it can suppress and prevent that it collides with the cylinder head 4 and the intake manifold 18 by repulsive force.

  The present invention can be used for an engine provided with a partition wall that partitions an intake port.

1 Engine 4 Cylinder head 11 Intake port 13 Intake valve 22 Partition part 23 Stick part 24 Plate part 100 Second plate part

Claims (3)

A partition that separates the intake ports provided in the cylinder head;
A stick part that is inserted into a guide groove formed in the intake port along the flow direction from an opening on the upstream side, and holds the partition wall part in the intake port;
A plate portion provided at a position facing the guide groove of the connecting member connected to the cylinder head;
With
At least one of the stick part and the plate part is made of a ferromagnetic material,
The engine, wherein the partition wall portion is held in the intake port by a magnetic force acting between the stick portion and the plate portion. One of the stick portion and the plate portion is made of a ferromagnetic material, and the other of the stick portion and the plate portion is made of a paramagnetic material,
The stick part is
The engine according to claim 1, wherein the engine is brought into contact with the plate portion by an attractive force acting between the plate portion and the plate portion. A second plate portion made of a ferromagnetic material on the downstream side of the guide groove;
The stick part and the plate part are made of a ferromagnetic material,
The stick part is
The engine according to claim 1, wherein the engine is held between the plate portion and the second plate portion by a repulsive force acting between the stick portion and the stick portion.

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