JP6623882B2 - Intake device - Google Patents

Description

  The present invention relates to an intake device, and more particularly, to an intake device provided with a resonator resonance pipe that allows a surge tank to communicate with a resonator resonance chamber.

  BACKGROUND ART Conventionally, there has been known an intake device including a resonator resonance tube that allows a surge tank to communicate with a resonator resonance chamber (for example, see Patent Document 1).

  Patent Document 1 discloses a surge tank that distributes intake air to each of a plurality of intake passages (intake ports), a resonance chamber (resonator resonance chamber) that amplifies intake pulsation in the surge tank, and a surge tank and a resonance chamber. An intake structure (intake device) of an engine having a communication passage (resonator resonance tube) for connection (communication) is disclosed. In the intake structure of the engine described in Patent Literature 1, a Helmholtz resonator is configured by the communication passage and the resonance chamber. That is, by using Helmholtz's resonance principle, the air in the communication passage is resonated and vibrated to amplify the intake pulsation of the engine by the resonance chamber, and the pressure wave on the positive pressure side of the amplified intake pulsation is supplied to the surge tank and the intake air. It is transmitted to each combustion chamber via the passage. Thus, the intake air amount is increased and the engine torque is increased. The communication passage has a smooth inner surface, has a plurality of curved portions from an opening opening at one end of the surge tank, extends a predetermined distance, and is connected to the resonance chamber.

JP-A-2-199265

  However, in the intake structure of the engine described in Patent Document 1, since the communication passage (resonator resonance tube) has a smooth inner surface, the vibration energy of the air vibrating in the communication passage is smooth. It is considered that the surface is easily affected by the viscous resistance of air to the surface, and the amplitude of the air column vibration is easily attenuated. Further, a method of increasing the length of the communication path for the purpose of increasing the pulsation energy (pressure wave on the positive pressure side of the intake pulsation) may be applied. However, as the length of the communication path having a smooth inner surface becomes longer, the air vibration increases. Since the amplitude of (air column vibration) is easily attenuated, there is a problem that the effect of increasing the engine torque is reduced.

  SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and an object of the present invention is to suppress a decrease in the engine torque increasing effect even when a longer resonator resonator tube is used. It is to provide an intake device that can perform the following.

  In order to achieve the above object, an intake device according to one aspect of the present invention includes a surge tank that distributes intake air to each of a plurality of intake ports, a resonator resonance chamber for amplifying intake pulsation in the surge tank, A resonance tank for communicating the surge tank with the resonator resonance chamber, the resonator resonance pipe being provided on the inner surface of the resonator resonance pipe along a flow direction of the intake air to reduce the viscous resistance. A first groove connected to the first groove along the flow direction of the intake air at one end connected to the surge tank of the resonator resonance tube or at least one of the other end connected to the resonator resonance chamber; And a plurality of second grooves for reducing viscous resistance having a groove width equal to or greater than the groove width of the first groove.

  In the intake device according to one aspect of the present invention, as described above, the plurality of first grooves for reducing viscous resistance provided on the inner surface of the resonator resonance tube along the flow direction of intake air, and the resonator resonance tube A portion of the inner surface at one end connected to the surge tank or at the other end connected to the resonator resonance chamber is provided so as to be continuous with the first groove along the flow direction of the intake air, The resonator resonator tube is configured to include a plurality of second grooves for reducing viscous resistance having a groove width equal to or greater than the groove width of one groove. Accordingly, the inner surface of the resonator resonator tube can be formed not by a mere smooth surface but by an uneven surface in which the first groove portion and the second groove portion are continuously formed. Resistance can be reduced. That is, by arranging the inner surface of the resonator resonance tube as a rough surface (uneven surface), the air oscillating along the flow direction of the intake air is rectified by the first groove portion and the second groove portion, and the separation of the air from the inner surface is prevented. As a result, the viscous resistance of air to the inner surface of the resonator tube can be reduced.

  Further, in the intake device according to the above aspect, the second groove is formed so as to be continuous with the first groove not only in the first groove but also in an inner surface portion of at least one of one end and the other end of the resonator resonator tube. By providing, the air with respect to the inner surface of the resonator resonance tube, not only at the boundary between the resonator resonance tube but also at least one of the surge tank connected to one end and the resonator resonance chamber connected to the other end. Since the viscous resistance of the air decreases, the vibration energy (pulsation energy) of the air in the intake device can be sufficiently maintained. By configuring the groove width of the second groove portion to be equal to or greater than the groove width of the first groove portion, at the boundary between the surge tank or the resonator resonance chamber and the resonator resonance pipe, the cross-sectional area of the flow path is changed from the surge tank or the resonator resonance chamber to the resonator. Even when the groove width is rapidly reduced toward the resonance tube, the passage resistance of air reciprocating between the surge tank and the resonator resonance chamber is reduced by the amount that the groove width of the second groove portion is equal to or greater than the groove width of the first groove portion. Can be reduced. This also allows the vibration energy of the air to be maintained. As a result, even when the resonator resonator tube is configured to be longer for the purpose of increasing the pulsation energy, it is possible to suppress a decrease in the effect of increasing the engine torque.

  In the intake device according to the one aspect, preferably, at least one of the one end and the other end of the resonator resonator tube is configured such that a cross-sectional area gradually increases toward the open end. The groove width of the groove is configured to gradually increase toward the open end of the resonator resonator tube.

  With this configuration, the groove width of the second groove is gradually increased from the groove width of the first groove so as to follow the opening shape at at least one of the one end and the other end of the resonator resonator tube. Even when the cross-sectional area of the flow passage is rapidly reduced from the surge tank or the resonator resonance chamber toward the resonator resonance tube, the air vibration (air column vibration) is effectively reduced while easily reducing the air passage resistance. Can be rectified. Therefore, air vibration in the intake device can be performed more smoothly.

  In this case, preferably, at least one of the one end and the other end of the resonator resonator tube has an inner surface inclined with respect to a direction in which an intermediate portion connecting the one end and the other end of the resonator resonator tube extends. In this state, the second groove portion extends while gradually increasing the cross-sectional area toward the opening end, and the plurality of second groove portions extend along the inner surface extending in an inclined state.

  With this configuration, at least one of the one end and the other end of the resonator resonance tube, the flow path cross-sectional area is rapidly reduced from the surge tank or the resonator resonance chamber toward the middle portion of the resonator resonance tube. Is suppressed, so that at least one boundary between the one end and the other end of the resonator resonator tube, the viscous resistance at the time of air vibration is reduced by the second groove, and the air passage resistance is surely reduced. Can be. Thereby, the vibration energy (pulsation energy) of the air in the intake device can be reliably maintained and transmitted to the intake port side.

  In the configuration in which the groove width of the second groove portion gradually increases toward the open end of the resonator resonator tube, preferably, the plurality of first groove portions are formed at a constant pitch circumferentially along the inner surface of the resonator resonator tube. And the plurality of second grooves are formed circumferentially along the inner surface of the resonator resonator tube and such that the pitch gradually increases toward the opening end.

  According to this structure, the groove width of the second groove can be gradually increased from the groove width of the first groove. Therefore, the cross-sectional area of the flow path is rapidly increased from the surge tank or the resonator resonance chamber toward the resonator resonance pipe. At one end or the other end (boundary portion) to be reduced, air vibration (air column vibration) can be effectively rectified while easily reducing the air passage resistance.

  In the intake device according to the above aspect, preferably, the other end of the resonator resonance tube protrudes into the resonator resonance chamber, and the plurality of second grooves protrude into the resonator resonance chamber of the resonator resonance tube. It is provided at the opening end and in the vicinity thereof.

  With this configuration, even if the intake device is configured such that the surge tank and the resonator resonance chamber are arranged close to each other, the other end of the resonator resonance pipe is connected to the inside of the resonator resonance chamber. In addition, while ensuring the length of the resonator resonance tube by making it protrude, the viscosity at the time of air vibration (air column vibration) is obtained by using the plurality of second grooves provided on the open end and the inner surface near the open end. A compact intake device capable of reducing the resistance can be obtained.

  The following configuration is also conceivable in the intake device according to the above aspect.

(Appendix 1)
That is, in the intake device according to the one aspect described above, the plurality of second grooves are provided on the inner surfaces of both the one end and the other end of the resonator resonator tube.

(Appendix 2)
Further, in the intake device according to the above aspect, the plurality of first grooves and the plurality of second grooves have a V-shaped, rectangular, or U-shaped cross-sectional shape.

FIG. 2 is a diagram when the intake device according to the first embodiment of the present invention is viewed from the side of the engine. It is a schematic diagram for explaining the function (Principle of Helmholtz and resonance amplitude) of the resonator unit in the intake device according to the first embodiment of the present invention. FIG. 2 is a diagram illustrating an internal structure of a resonance pipe in the intake device according to the first embodiment of the present invention. FIG. 3 is a cross-sectional view at an intermediate portion of the resonance tube taken along line 150-150 in FIG. 2. FIG. 3 is a cross-sectional view at an end of the resonance tube taken along line 160-160 in FIG. 2. It is a figure showing an internal structure of a resonance pipe in an intake device by a 1st modification of a 1st embodiment of the present invention. It is a figure showing the internal structure of the resonance pipe in the air intake system by the 2nd modification of a 1st embodiment of the present invention. It is a figure showing the internal structure of the resonance pipe in the intake system by the 3rd modification of a 1st embodiment of the present invention. FIG. 5 is a view illustrating an intake device according to a second embodiment of the present invention. It is sectional drawing which showed the inner surface of the resonance pipe in the intake device by the modification of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
The configuration of the intake device 100 according to the first embodiment of the present invention will be described with reference to FIGS.

  The intake device 100 according to the first embodiment of the present invention is mounted on an in-line four-cylinder engine 110 as shown in FIG. The engine 110 is an automobile engine, and the engine 110 is mounted in an engine room (not shown) in a state where the intake device 100 is assembled to the engine main body 110a. The intake device 100 includes a resin device main body 80 including the surge tank 10 and the intake pipe portion 20 connected to a downstream side of the surge tank 10. Further, the apparatus main body 80 is provided with a resonator unit 30 connected to the surge tank 10 at a position different from the intake pipe unit 20.

  The surge tank 10 extends along the cylinder row (X-axis direction) of the engine main body 110a. In the intake pipe section 20, the intake ports 21, 22, 23, and 24 are arranged along the cylinder row from the X1 side. The upstream ends (Z2 side) of the intake ports 21 to 24 are connected to the side wall 11 of the surge tank 10, and the downstream ends (Z1 side) correspond to the cylinders (not shown) in the cylinder head 111. Connected. A throttle valve 120 (shown by a broken line) is connected to the upstream side (X1 side) of the surge tank 10.

  The resonator unit 30 is a Helmholtz resonator. In addition, the resonator unit 30 includes a resonance tube 33 (an example of a resonator resonance tube) and a resonance chamber 35 (an example of a resonator resonance chamber). The resonance tube 33 has one end 1a connected to the surge tank 10 and the other end 1b connected to the resonance chamber 35. Further, the resonance tube 33 is connected via an intermediate portion 9 in which one end 1a and the other end 1b extend linearly, and the surge tank 10 and the resonance chamber 35 are communicated via the resonance tube 33. ing. Therefore, the resonator unit 30 including the resonance chamber 35 amplifies the intake pulsation in the intake device 100 and converts the amplified positive pressure side pressure wave (pulsation energy) of the intake pulsation into the combustion chamber (not shown) of the engine body 110a. ) To increase the amount of air taken into the combustion chamber (accumulation efficiency).

Here, the principle of Helmholtz resonance and its equivalent dynamic model will be described with reference to FIG. As shown in the frame on the left side of FIG. 2, the resonance frequency (natural frequency) when the resonator unit 30 causes the intake pulsation to resonate at a specific engine speed is the following formula (1) which is a Helmholtz resonance formula. ).
F = (c / 2π) × (S / (V × (L + 0.6 × r)) ^0.5 (1)
In the above formula (1), F is a resonance frequency (Hz), c is a sound speed (m / s), S is a cross-sectional area of the resonance tube (m ² ), and V is a volume of the resonance chamber (m ³ ). , L is the length (m) of the resonance tube, and r is the radius (m) of the inner diameter of the resonance tube. The term 0.6 × r indicates a correction coefficient of the open end of the resonance tube.

  As is apparent from the above equation (1), in order to increase the effect of increasing the engine torque at a specific resonance frequency F (engine speed), it is necessary to increase the length L as the cross-sectional area S of the resonance tube increases. Valid. This makes it possible to increase the pulsation energy during resonance (pressure wave on the positive pressure side of intake pulsation) while maintaining the resonance frequency F at a predetermined value.

Further, the vibration of the air column having the cross-sectional area S and the length L of the resonance tube is a dynamic model of a mass-spring damper system as shown in the right frame of FIG. Is equivalent to In this case, the vibration phenomenon of the air column in the resonance tube is represented by the following equation of motion (2).
m × (dx / dt) ² + C × (dx / dt) + k × x = f (2)
In the above equation (2), m is the mass (kg) of air in the air column, C is the damping coefficient of air column vibration, k is the spring coefficient of the resonance chamber, and f is the input vibration (in the surge tank 10). , X is the displacement of a vibrating body (air column) having mass m. Then, in the above equation (2), it is known that as the damping coefficient C of the air column vibration decreases, the amplitude during resonance vibration (resonance amplitude) increases. The damping coefficient C corresponds to the coefficient of viscous resistance of air (air column) to the inner surface of the resonance tube.

  Therefore, reducing the viscous drag coefficient (attenuation coefficient C) of the air with respect to the inner surface 33a (see FIG. 1) of the resonance tube 33 reduces the attenuation of the amplitude of the air column vibration and the resonator unit 30 including the resonance chamber 35. It can be seen that this contributes to the maintenance of the vibration energy (pulsation energy) of the air at the time. The maintenance of the vibration energy of the air in the resonator unit 30 contributes to an increase in the torque of the engine 110 (an effect of increasing the engine torque).

(Detailed structure of the resonator section)
Here, in the first embodiment, as shown in FIG. 3, the resonance pipe 33 includes a plurality of grooves 31 (in the X-axis direction) on the inner surface 33 a corresponding to the intermediate portion 9 along the flow direction of the intake air (the X-axis direction). An example of a first groove) is provided. Here, the “flow direction of intake air (X-axis direction)” means a direction in which air (intake air) performs air column vibration in the resonance pipe 33. The plurality of grooves 31 are formed in a streak shape. The intermediate section 9 has a cross-sectional area of S1 (see FIG. 4). In addition to the groove 31, a plurality of grooves 32a (of the second groove) are formed along the flow direction of the intake air (X-axis direction) on the inner surface 33a corresponding to the one end 1a connected to the surge tank 10. An example) is provided in a streak shape, and a plurality of grooves 32b (the second groove 32b) are formed along the flow direction (X-axis direction) of the intake air at the portion of the inner surface 33a corresponding to the other end 1b connected to the resonance chamber 35. An example of two grooves) is provided in a streak shape.

  The plurality of grooves 31 and the grooves 32a and 32b are both provided to reduce the viscous resistance of the air (intake air) that repeatedly causes air column vibration in the direction of arrow X1 and the direction of arrow X2 to the inner surface 33a. The grooves 32a and 32b are provided so as to be continuous with the groove 31 along the flow direction of the intake air. The groove 31 has a groove width W1, as shown in FIG. On the other hand, as shown in FIG. 5, the groove portions 32a and 32b have a groove width W2 equal to or larger than the groove width W1. In this case, the connecting portion between the groove 31 and the groove 32a (32b) has the groove width W1, and the section of the groove 32a (32b) is configured to be changed (enlarged) from the groove width W1 to the groove width W2. ing. The groove width W1 and the groove width W2 indicate the maximum widths of the groove portions 31 (32a, 32b) adjacent to each other.

  The configuration of the resonance tube 33 will be further described. As shown in FIG. 3, one end 1a connected to the surge tank 10 is configured such that the cross-sectional area S2 (see FIG. 5) gradually increases toward the open end 1c. The groove width W2 (see FIG. 5) is configured to gradually increase toward the open end 1c of the resonance tube 33. The one end 1a gradually expands (increases the diameter) the cross-sectional area S2 toward the opening end 1c in a state where the inner surface 33a is inclined so as to expand toward the arrow X1 direction in which the intermediate portion 9 extends. The plurality of grooves 32a extend along the inner surface 33a that extends inclining in a divergent manner. In this case, at the connection portion between the groove 31 and the groove 32a, the cross-sectional area S2 is equal to the cross-sectional area S1. The sectional area S2 increases from the groove 31 toward the opening end 1c, and reaches a maximum value at the opening end 1c. The plurality of grooves 31 are formed circumferentially at a constant pitch (groove formation interval) P1 (see FIG. 4) along the inner surface 33a of the resonance tube 33, and the plurality of grooves 32a are formed in the resonance tube 33. The pitch (groove formation interval) P2 (see FIG. 5) is formed circumferentially along the inner surface 33a of the opening 33 and gradually toward the opening end 1c. In this case, the pitch is P1 in the connection portion between the groove 31 and the groove 32a, and in the section of the groove 32a, the pitch P1 is changed (enlarged) to the pitch P2. Note that the pitches P1 and P2 are the intervals between the centers of the adjacent groove portions 31 (32a, 32b).

  The other end 1b is similarly configured. That is, the other end 1b connected to the resonance chamber 35 is configured such that the cross-sectional area S gradually increases toward the open end 1d, and the groove width W2 of the groove 32b (see FIG. 5) is The resonance tube 33 is configured to gradually increase toward the open end 1d. The other end 1b gradually expands (increases in diameter) the cross-sectional area S toward the opening end 1d in a state where the inner surface 33a is inclined so as to expand toward the arrow X2 direction in which the intermediate portion 9 extends. The plurality of groove portions 32b extend along the inner surface 33a extending inclining in a divergent manner. In this case, at the connection portion between the groove 31 and the groove 32b, the cross-sectional area S2 is equal to the cross-sectional area S1. The cross-sectional area S2 increases toward the opening end 1d from the groove 31 and reaches the maximum value at the opening end 1d. The plurality of grooves 32b are formed circumferentially along the inner surface 33a of the resonance tube 33 and such that the pitch P2 (see FIG. 5) gradually increases toward the opening end 1d. Further, as shown in FIG. 5, the plurality of grooves 31 and the plurality of grooves 32a and 32b have a V-shaped cross section.

  As a result, the inner surface 33a of the resonance tube 33 is not a mere smooth surface, but is formed by an uneven surface in which the groove 32a and the groove 32b are continuously formed on both sides of the groove 31. Therefore, the viscous resistance of the air to the inner surface 33a is reduced. That is, since the entire inner surface 33a of the resonance tube 33 is formed as a rough surface (uneven surface), the air oscillating in the flow direction of the intake air is rectified by the uneven surface of the groove 32a, the groove 31, and the groove 32b. Thus, the separation of air from the inner surface 33a is promoted. Thereby, the viscous resistance of the air to the inner surface 33a is reduced. Further, not only the groove portion 31 corresponding to the intermediate portion 9 but also the portion of the inner surface 33a at the one end portion 1a and the other end portion 1b has a groove width W2 greater than the groove width W1 of the groove portion 31 so as to be continuous with the groove portion 31. By providing the grooves 32a and 32b for reducing the viscous resistance, not only the resonance pipe 33 but also the boundary between the surge tank 10 connected to the one end 1a and the resonance chamber 35 connected to the other end 1b are provided. Also in the part, the viscous resistance of air to the inner surface 33a is reduced.

  The resin surge tank 10, the resonance pipe 33, and the resonance chamber 35 are formed by joining a plurality of piece members divided by a predetermined division surface (not shown) to each other along the division surface by vibration welding. It is integrated. In addition, as shown in FIG. 1, the intake ports 21 to 24 have an arcuate shape that is convex in the direction of the arrow Y1 (toward the paper surface) away from the engine body 110a. In addition, the intake ports 21 to 24 draw an arc shape (arc shape) while rising upward from the side wall 11 on the Y1 side of the surge tank 10. Then, the direction changes gradually from the direction of the arrow Z1 to the direction of the arrow Y2 (the depth direction in the drawing) and extends. The opening ends (flanges) on the Y1 side of the intake ports 21 to 24 are connected to the cylinder head 111.

  Therefore, in the intake device 100, when the resonance pipe 33 is formed with the predetermined length L and the cross-sectional area S, the resonance pipe 33 is maintained at a specific resonance frequency F shown in the equation (1). (Pressure wave on the positive pressure side of the intake pulsation) is hardly attenuated (decreased) due to the length L of the resonance pipe 33. In order to easily obtain this effect, grooves 32a and 32b are provided on the inner surface 33a of the resonance tube 33 in addition to the groove 31. The intake device 100 according to the first embodiment is configured as described above.

  In the first embodiment, the following effects can be obtained.

  In the first embodiment, as described above, the plurality of grooves 31 for reducing the viscous resistance provided on the inner surface 33a of the resonance tube 33 along the flow direction of the intake air (the direction of air column vibration); At one end 1a connected to the surge tank 10 and the other end 1b connected to the resonance chamber 35, the inner surface 33a is provided so as to be continuous with the groove 31 along the flow direction of the intake air. The resonance tube 33 is configured to include a plurality of grooves 32a and 32b for reducing the viscous resistance having a groove width W2 greater than or equal to the groove width W1 of the groove 31. Thereby, the inner surface 33a of the resonance tube 33 can be formed not by a mere smooth surface but by an uneven surface in which the groove 31 and the grooves 32a and 32b are continuously formed. Viscous drag can be reduced. That is, by arranging the inner surface 33a of the resonance tube 33 as a rough surface (irregular surface), the air oscillating in the flow direction of the intake air is rectified by the grooves 31 and the grooves 32a and 32b, and the air from the inner surface 33a The viscous resistance of air to the inner surface 33a of the resonance tube 33 can be reduced by the amount by which the separation is promoted.

  In the first embodiment, not only the groove 31 but also the inner surface 33a at each of the one end 1a and the other end 1b of the resonance tube 33 is not less than the groove width W1 of the groove 31 so as to be continuous with the groove 31. The groove portions 32a and 32b for reducing the viscous resistance having the groove width W2 are provided. Thus, not only at the resonance pipe 33 but also at the boundary between the surge tank 10 connected to the one end 1a and the resonance chamber 35 connected to the other end 1b, the inner surface 33a of the resonance pipe 33 is formed. Therefore, the vibratory energy (pulsation energy) of the air in the intake device 100 can be sufficiently maintained. By configuring the groove width W2 of the grooves 32a and 32b to be equal to or greater than the groove width W1 of the groove 31, the cross-sectional area S2 at the boundary between the surge tank 10 and the resonance chamber 35 and the resonance pipe 33 is reduced. Also in the case where the groove width is rapidly reduced from 35 toward the intermediate portion 9 of the resonance tube 33, the surge tank 10 and the resonance chamber 35 are connected to each other because the groove width W2 of the grooves 32a and 32b is equal to or larger than the groove width W1 of the groove 31. It is possible to reduce the passage resistance of the air reciprocating between them. This also allows the vibration energy of the air to be maintained. As a result, even when the resonance tube 33 is configured to be longer for the purpose of increasing pulsation energy, it is possible to suppress a decrease in the effect of increasing the engine torque.

  In the first embodiment, the plurality of grooves 32a and 32b are provided on the inner surface 33a of both the one end 1a and the other end 1b of the resonance tube 33, respectively. Thereby, the vibration energy (pulsation energy) of the air reciprocating between the surge tank 10 and the resonance chamber 35 via the resonance pipe 33 can be more reliably maintained.

  In the first embodiment, the one end 1a and the other end 1b of the resonance tube 33 are configured so that the cross-sectional area S2 gradually increases toward the open ends 1c and 1d. The groove width W2 is configured to gradually increase toward the open ends 1c and 1d of the resonance tube 33. Thereby, the groove width W2 of the grooves 32a and 32b is gradually increased from the groove width W1 of the groove 31 so as to follow the opening shapes at the one end 1a and the other end 1b of the resonance tube 33. Even when S2 is rapidly reduced from the surge tank 10 and the resonance chamber 35 toward the intermediate portion 9 of the resonance pipe 33, the air vibration (air column vibration) is effectively reduced while easily reducing the air passage resistance. Can be rectified. Therefore, the air vibration in the intake device 100 can be performed more smoothly.

  Further, in the first embodiment, the one end 1a and the other end 1b of the resonance tube 33 are both opened at the open end with the inner surface 33a inclined so as to diverge with respect to the X-axis direction in which the intermediate portion 9 extends. The cross-sectional area S2 is configured to be gradually increased and expanded toward the portions 1c and 1d. Then, the plurality of grooves 32a and 32b are configured to extend along the inner surface 33a that extends inclining in a divergent manner. This suppresses a sudden reduction in the sectional area S2 from the surge tank 10 and the resonance chamber 35 toward the intermediate portion 9 of the resonance tube 33 at the one end 1a and the other end 1b of the resonance tube 33. At the boundary between the one end 1a and the other end 1b of the resonance tube 33, the viscous resistance at the time of air vibration is reduced by the grooves 32a and 32b, and the air passage resistance can be surely reduced. Therefore, the vibration energy (pulsation energy) of the air in the intake device 100 can be reliably maintained and transmitted to each of the intake ports 21 to 24.

  In the first embodiment, the plurality of grooves 31 are formed circumferentially at a constant pitch P1 (groove formation interval) along the inner surface 33a of the resonance tube 33, and the plurality of grooves 32a and 32b are formed in the resonance tube 33. Is formed so as to be circumferentially along the inner surface 33a and so that the pitch P2 (groove formation interval) gradually increases toward the opening ends 1c and 1d. Thereby, the groove width W1 of the grooves 32a and 32b can be gradually increased from the groove width W1 of the groove 31, so that the cross-sectional area S2 increases from the surge tank 10 and the resonance chamber 35 toward the middle 9 of the resonance pipe 33. At the one end 1a and the other end 1b (boundary portion) that are rapidly reduced, air vibration (air column vibration) can be effectively rectified while easily reducing the air passage resistance.

  In the first embodiment, the plurality of groove portions 31 and the groove portions 32a and 32b are configured to have a V-shaped cross section. Thereby, in the manufacturing process, a plurality of grooves 31 and grooves 32a and 32b for reducing (reducing) rectification and viscous resistance during air vibration (air column vibration) are easily provided on the inner surface 33a of the resonance tube 33. Can be.

[First Modification of First Embodiment]
Next, a first modification of the first embodiment will be described with reference to FIGS. In the first modification of the first embodiment, an example will be described in which each of the one end 2a and the other end 2b is configured to expand (expand) with a certain inclination angle. In the drawings, the same components as those in the first embodiment are denoted by the same reference numerals.

  As shown in FIG. 6, in the resonator unit 130 of the intake device (not shown) according to the first modification of the first embodiment, the surge tank 10 and the resonance chamber 35 are communicated via the resonance pipe 133. ing. The resonance tube 133 has one end 2a having a plurality of grooves 132a (an example of a second groove) and a plurality of grooves 132b (an example of a second groove) at both ends of an intermediate portion 9 having a plurality of grooves 31. The other end 2b is provided, respectively.

  The one end 2a has a cross-sectional area toward the open end 2c in a state where the inner surface 133a has a constant inclination angle with respect to the direction of the arrow X1 (the center axis of the resonance tube 133) in which the intermediate portion 9 extends. The plurality of grooves 132a extend along the inner surface 133a that extends at a certain inclination angle. Similarly, the other end 2b has a cross-sectional area toward the open end 2d in a state where the inner surface 133a has a certain inclination angle with respect to the direction of the arrow X2 (the center axis of the resonance tube 133) in which the intermediate portion 9 extends. Are gradually extended, and the plurality of groove portions 132b extend along the inner surface 133a extending at this constant inclination angle. Also, the plurality of grooves 132a and 132b are formed so that the pitch P2 (see FIG. 5) gradually increases circumferentially along the inner surface 133a of the resonance tube 133 and toward the open ends 2c and 2d. Is formed. The other configuration of the resonator unit 130 is the same as that of the first embodiment.

(Effects of First Modification of First Embodiment)
In the first modified example of the first embodiment, the one end 2a and the other end 2b of the resonance tube 133 are fixed at the inner surface 133a with respect to the X-axis direction (the center axis of the resonance tube 133) where the intermediate portion 9 extends. With the inclination angle of?, The sectional area is gradually increased toward the open ends 2c and 2d. Then, the plurality of grooves 132a and 132b are configured to extend along the inner surface 133a extending at this fixed inclination angle. This suppresses a sudden reduction in the sectional area S2 from the surge tank 10 and the resonance chamber 35 toward the intermediate portion 9 of the resonance tube 133 at the one end 2a and the other end 2b of the resonance tube 133. At the boundary between the one end 2a and the other end 2b of the resonance tube 133, the viscous resistance at the time of air vibration can be reduced by the grooves 132a and 132b, and the air passage resistance can be surely reduced. Therefore, the vibration energy (pulsation energy) of the air in the intake device can be reliably maintained. The other effects are the same as those of the first embodiment.

[Second Modification of First Embodiment]
Next, a second modification of the first embodiment will be described with reference to FIGS. In the second modification of the first embodiment, an example will be described in which the resonator 230 is configured so that the other end 3b of the resonance tube 233 projects into the resonance chamber 35. In the drawings, the same components as those in the first embodiment are denoted by the same reference numerals.

  As shown in FIG. 7, the surge tank 10 and the resonance chamber 35 communicate with each other through the resonance pipe 233 in the resonator unit 230 that forms the intake device (not shown) according to the second modification of the first embodiment. ing. In the resonance tube 233, one end 3a having a plurality of grooves 232a (an example of a second groove) and a plurality of grooves 232b (of the second groove) are provided at both ends of an intermediate portion 9 having a plurality of grooves 31 on the inner surface 233a. Each of the other end portions 3b having an example is provided.

  The other end 3b of the resonance tube 233 protrudes into the resonance chamber 35, and the plurality of grooves 232b are provided near the opening end 3d protruding into the resonance chamber 35 of the resonance tube 233. ing. The detailed configuration of the grooves 232a and 232b is the same as the grooves 32a and 32b (see FIG. 3) described in the first embodiment.

  In the resonator unit 230, the intake device is configured such that the surge tank 10 and the resonance chamber 35 are arranged close to each other. In such a case, it is necessary to secure the length L of the resonance tube 233 so that the resonator unit 230 maintains a specific resonance frequency F. For this reason, the other end 3 b of the resonance tube 233 is projected into the resonance chamber 35 to form the resonator 230. Although not shown in detail, in the resonator unit 230, an on-off valve for opening and closing the opening end 3d is configured to be attachable. That is, in this intake device, when increasing the torque in accordance with the operating state of the engine 110, the resonator unit 230 is operated by opening the on-off valve to communicate the resonance pipe 233 and the resonance chamber 35, while the torque is increased. When the up is unnecessary, it is possible to switch between the case where the on-off valve is closed and the resonator 230 is not operated. The other end 3 b (open end 3 d) protrudes into the resonance chamber 35 in order to enhance the sealing performance of the on-off valve that opens and closes the resonance pipe 233. The other configuration of the resonator unit 230 is the same as that of the first embodiment.

(Effect of the Second Modification of the First Embodiment)
In the second modified example of the first embodiment, the other end 3b of the resonance tube 233 is made to protrude into the resonance chamber 35, and the plurality of grooves 232b are protruded into the resonance chamber 35 of the resonance tube 233. 3d and provided in the vicinity thereof. Accordingly, even when the intake device is configured such that the surge tank 10 and the resonance chamber 35 are arranged close to each other, the other end 3 b of the resonance pipe 233 protrudes into the resonance chamber 35. By virtue of this, while ensuring the sufficient length L of the resonance tube 233, the viscosity at the time of air vibration (air column vibration) is utilized by using the plurality of grooves 232b provided on the opening end 3d and the inner surface 233a in the vicinity thereof. A compact intake device capable of reducing the resistance can be obtained.

  In the second modification of the first embodiment, the other end 3b of the resonance tube 233 is protruded into the resonance chamber 35, so that the torque of the intake device that can switch the presence or absence of the torque-up function can be reduced. When the up function is not required, the resonator 230 can be made to function effectively at the time of increasing the torque while sufficiently securing the sealability of the on-off valve at the opening end 3d. Other effects of the second modification of the first embodiment are the same as those of the first embodiment.

[Third Modification of First Embodiment]
Next, a third modification of the first embodiment will be described with reference to FIGS. In the third modification of the first embodiment, the other end 4b of the resonance tube 333 protrudes into the resonance chamber 35, and each of the one end 4a and the other end 4b has a certain inclination angle. An example will be described in which the structure is expanded. In the drawings, the same components as those in the first embodiment are denoted by the same reference numerals.

  As shown in FIG. 8, in a resonator unit 330 that constitutes an intake device (not shown) according to a third modification of the first embodiment, the surge tank 10 and the resonance chamber 35 are communicated via a resonance pipe 333. ing. The resonance tube 333 has one end 4a having a plurality of grooves 332a (an example of a second groove) and a plurality of grooves 332b (an example of a second groove) at both ends of an intermediate portion 9 having a plurality of grooves 31. The other end 4b is provided, respectively.

  The one end 4a has a cross-sectional area toward the open end 4c in a state where the inner surface 333a has a constant inclination angle with respect to the direction of the arrow X1 (the center axis of the resonance tube 333) in which the intermediate portion 9 extends. The plurality of grooves 332a extend along the inner surface 333a extending at a certain inclination angle. Similarly, the other end 4b has a cross-sectional area toward the open end 4d in a state where the inner surface 333a has a certain inclination angle with respect to the direction of the arrow X2 (the center axis of the resonance tube 333) in which the intermediate portion 9 extends. Are gradually extended, and the plurality of groove portions 332b extend along the inner surface 333a extending at this constant inclination angle.

  In the resonator section 330, the other end 4 b of the resonance tube 333 protrudes into the resonance chamber 35, and the plurality of grooves 332 b has an opening end 4 d protruding into the resonance chamber 35 of the resonance tube 333. It is provided in the vicinity. The reason that the resonator unit 330 has such a structure is the same as the resonator unit 230 (see FIG. 7) according to the second modification of the first embodiment. The other configuration is the same as that of the first modification of the first embodiment.

(Effect of Third Modification of First Embodiment)
In the third modified example of the first embodiment, the one end 4a and the other end 4b are extended toward the open ends 4c and 4d with a certain inclination angle while gradually increasing the cross-sectional area, and the groove 332a is formed. And 332b extend along inner surface 333a. In addition, the other end 4b of the resonance tube 333 is protruded into the resonance chamber 35, and a plurality of grooves 332b are provided in the vicinity of the opening end 4d protruding into the resonance chamber 35 of the resonance tube 333. Thereby, the same effects as those of the second and third modifications of the first embodiment can be obtained.

[Second embodiment]
Next, a second embodiment will be described with reference to FIG. 4, FIG. 5, and FIG. In the second embodiment, an example will be described in which a resonance chamber 435 is integrally formed on a side wall 411 of a surge tank 410 to form a resonator 430. In the drawings, the same components as those in the first embodiment are denoted by the same reference numerals.

  As shown in FIG. 9, in a resonator section 430 constituting an intake device 400 according to the second embodiment, a resonance chamber 435 is formed integrally with a side wall section 411 of a surge tank 410. That is, the surge tank 410 and the resonance chamber 435 are adjacent to each other with the partition wall 411a therebetween. One resonance tube 433 is provided so as to penetrate the partition wall 411a. The resonance tube 433 has one end 5a that opens to the surge tank 410 at the partition 411a, and the other end 5b that projects from the partition 411a into the resonance chamber 435 and opens.

  The inner surface 433a of the resonance tube 433 including the one end 5a and the other end 5b has a plurality of grooves having the same cross-sectional shape (see FIGS. 4 and 5) as described in the first embodiment. 31, grooves 432a and 432b are formed. Further, in order to secure the length L of the resonance tube 433, the middle portion 9 and the other end 5b of the resonance tube 433 project into the resonance chamber 435. Therefore, the plurality of grooves 432b are provided at the opening end 5d protruding into the resonance chamber 435 of the resonance tube 433 and in the vicinity thereof. The reason that the resonator section 430 has such a structure is the same as the resonator section 230 (see FIG. 7) according to the second modification of the first embodiment. The rest of the configuration of the resonator unit 430 is the same as in the first embodiment.

(Effect of Second Embodiment)
In the second embodiment, as described above, the intermediate portion 9 and the other end 5b of the resonance tube 433 are protruded into the resonance chamber 435, and the plurality of grooves 432b are protruded into the resonance chamber 435 of the resonance tube 433. 5d and the vicinity thereof. Thus, even when the intake device 400 is configured such that the surge tank 410 and the resonance chamber 435 are arranged close to each other, the other end 5b of the resonance pipe 433 is placed inside the resonance chamber 435. By projecting, the length L of the resonance tube 433 is sufficiently ensured, and at the time of air vibration (air column vibration) using the plurality of grooves 432b provided on the opening end 5d and the inner surface 533a near the opening end 5d. A compact intake device 400 capable of reducing viscous resistance can be obtained.

[Modification]
The embodiments disclosed this time are to be considered in all respects as illustrative and not restrictive. The scope of the present invention is defined by the terms of the claims, not the description of the embodiments, and further includes all modifications (modifications) within the meaning and scope equivalent to the terms of the claims.

  For example, in the first embodiment, the first to third modifications of the first embodiment, and the second embodiment, the plurality of groove portions 31 and the groove portions 32a and 32b are configured to have a V-shaped cross-sectional shape. However, the present invention is not limited to this. For example, the cross-sectional shape of the resonance tube 933 may be configured as in a modified example of the present invention shown in FIG.

  Specifically, as shown in FIG. 10, as the cross-sectional shape of the “first groove” and “second groove” of the present invention, pattern A having a rectangular cross-sectional shape with a flat bottom (FIG. , A pattern B having a U-shaped cross-sectional shape having a rounded bottom (in a central frame in FIG. 10), or a pattern C having an inverted trapezoidal cross-sectional shape (in FIG. 10). (In the right frame). A plurality of grooves 532 having a cross-sectional shape of pattern A, a plurality of grooves 632 having a cross-sectional shape of pattern B, and a plurality of grooves 732 having a cross-sectional shape of pattern C are provided by a resonance tube 533 (633, 733) (resonator resonance tube). It is preferably formed not only at the groove 31 of the intermediate part 9 (see FIG. 1) of at least one example but also at least one of the one end 1a and the other end 1b (see FIG. 1). Due to this, in the manufacturing process, a plurality of “first grooves” for reducing rectification and viscous resistance at the time of air vibration (air column vibration) are formed on the inner surface 533a (633a, 733a) of the resonance tube 533 (633, 733). And the "second groove" can be easily provided.

  In the first embodiment, the first to third modifications of the first embodiment, and the second embodiment, the “second groove” of the present invention is replaced with the “one end” and the “other” of the “resonator resonance tube”. However, the present invention is not limited to this. That is, the “second groove” of the present invention may be provided at either the “one end” or the “other end” of the “resonator resonator tube”.

  In the first embodiment, the first to third modifications of the first embodiment, and the second embodiment, the groove width W2 of the “second groove” of the present invention is changed to the “open end portion” of the “resonator resonance tube”. ), But the present invention is not limited to this. For example, the groove width W2 at the “open end” may be equal to the groove width W1 at the intermediate portion 9. Then, the number of “second grooves” at “one end” or “other end” where the cross-sectional area of “resonator resonance tube” is enlarged may be increased.

  In the first embodiment, the first to third modifications of the first embodiment, and the second embodiment, the intake device 100 (400) is made of resin, but the present invention is not limited to this. The intake device 100 (400) including the resonance tube 33 and the like may be made of metal.

  In the first embodiment, the first to third modified examples of the first embodiment, and the second embodiment, one end 1a (2a to 5a) and the other end are provided via the intermediate portion 9 that extends linearly. Although the example in which 1b (2b to 5b) is connected has been described, the present invention is not limited to this. That is, the resonance tube 33 (133 to 433) may be configured by using the curved intermediate portion 9. The inner surface 33a (133a to 433a) of the one end 1a and / or the other end 1b with respect to the direction in which the connecting portion between the one end 1a and / or the other end 1b and the curved intermediate portion 9 extends. Should be inclined in the direction of gradually increasing the cross-sectional area toward the opening end.

  In the first embodiment, the first to third modifications of the first embodiment, and the second embodiment, the present invention is applied to the intake device 100 (400) for the in-line four-cylinder engine 110. The present invention is not limited to this. The present invention may be applied to an intake device for a multi-cylinder engine such as a V-type or a horizontally opposed type. Further, the present invention may be applied not only to the intake device 100 (400) mounted on an automobile engine but also to the intake device mounted on a stationary engine.

1a, 2a, 3a, 4a, 5a One end 1b, 2b, 3b, 4b, 5b The other end 1c, 1d, 2c, 2d, 3c, 3d, 4c, 4d, 5c, 5d Open end 9 Intermediate part 10 , 410 Surge tank 21, 22, 23, 24 Intake port 30, 130, 230, 330, 430 Resonator 31 Groove (first groove)
32a, 32b, 132a, 132b, 232a, 232b, 532, 632, 732 Groove (second groove)
33, 133, 233, 333, 433, 533, 633, 733 Resonance tube (resonator resonance tube)
33a, 133a, 233a, 333a, 433a, 933a Inner surface 35, 435 Resonance chamber (resonator resonance chamber)
100, 400 Intake device W1, W2 Groove width P1, P2 Pitch

Claims (5)

A surge tank that distributes intake air to each of the plurality of intake ports,
A resonator resonance chamber for amplifying intake pulsation in the surge tank,
A resonator resonance tube that communicates the surge tank and the resonator resonance chamber,
The resonator resonator tube,
A plurality of first grooves for reducing viscous drag provided on an inner surface of the resonator resonance tube along a flow direction of intake air;
A portion of the inner surface of at least one end of the resonator resonance tube connected to the surge tank or the other end connected to the resonator resonance chamber is connected to the first groove along the flow direction of the intake air. And a plurality of second grooves for reducing viscous resistance having a groove width equal to or greater than the groove width of the first groove. At least one of the one end or the other end of the resonator resonator tube is configured such that a cross-sectional area gradually increases toward an open end,
2. The intake device according to claim 1, wherein a groove width of the second groove is configured to gradually increase toward an open end of the resonator resonator tube. 3. At least one of the one end and the other end of the resonator tube has an inner surface inclined with respect to a direction in which an intermediate portion connecting the one end and the other end of the resonator tube extends. In the state, it extends while gradually increasing the cross-sectional area toward the opening end,
The intake device according to claim 2, wherein the plurality of second grooves extend along the inner surface extending in the inclined state. The plurality of first grooves are formed at a constant pitch circumferentially along the inner surface of the resonator resonator tube,
4. The plurality of second grooves are formed circumferentially along the inner surface of the resonator resonator tube so that the pitch gradually increases toward the opening end. 5. The air intake device according to claim 1. The other end of the resonator resonance tube projects into the resonator resonance chamber,
5. The intake device according to claim 1, wherein the plurality of second grooves are provided at an opening end of the resonator resonator tube protruding into the resonator resonance chamber and in the vicinity thereof.

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