Engine intake system

Abstract

To provide an intake device of an engine hardly affected by dew condensation water generated accompanied by a temperature change of an engine room, and capable of propagating intake sound of a prescribed frequency to a cabin while suppressing lowering of a sound volume.SOLUTION: An intake sound increasing device 120 is inserted between an introduction passage portion 118 and a lead-out passage portion 119 constituting a second passage. The intake sound increasing device 120 has a vibration body 122 composed of a bellows portion 123 and a vibration film 124, and an outer peripheral case 121 disposed in a manner of surrounding an outer periphery of the bellows portion 123. The lead-out passage portion 119 is connected to a rear side part of the outer peripheral case 121 and formed to be extended toward a cabin. The lead-out passage 119 is disposed in an inclined attitude to gradually lower to a vertical lower part as it separates from the intake sound increasing device 120.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an intake system for an engine, and more particularly to an intake system equipped with an intake sound enhancement device for increasing the intake sound propagated to a vehicle interior. [Background technology]

[0002] Some vehicles are equipped with an intake sound enhancement device that intentionally increases the intake sound of the engine mounted in the engine room and transmits it inside the vehicle cabin. A driver who drives a vehicle equipped with such an intake sound enhancement device can obtain a sense of satisfaction from driving the vehicle from an auditory perspective due to the sound effect corresponding to the accelerator operation.

[0003] Patent Document 1 discloses a vehicle equipped with an intake sound amplification device. The intake sound amplification device disclosed in Patent Document 1 has a cylindrical bellows portion that is expandable and contractible in the axial direction of the cylinder, and a vibrating membrane that is formed integrally with the bellows portion so as to close one opening of the bellows portion. An introduction passage portion that branches off from an intake passage that is a passage for fresh air to the engine is connected to the other opening of the bellows portion in the intake sound amplification device, and an outlet passage portion that opens toward the vehicle cabin is connected to the side of the intake sound amplification device where the vibrating membrane is formed.

[0004] The technology disclosed in Patent Document 1 aims to broaden the bandwidth of the intake sound propagated into the vehicle cabin by offsetting the pipe centers of the inlet passage section and the outlet passage section from the center of the vibrating membrane in a direction along the main surface of the vibrating membrane. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2012-7502 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, since the intake sound amplification device is installed in the engine compartment, condensation may occur due to temperature changes in the engine compartment between when the engine is started and when the engine is stopped. When condensation occurs in the intake sound amplification device, the condensed water may adhere to the diaphragm. When condensed water adheres to the diaphragm, the diaphragm becomes difficult to vibrate due to the influence of the mass of the condensed water, and the frequency of the intake sound transmitted to the passenger compartment deviates from the specified frequency related to the design, and the volume becomes low.

[0007] The present invention has been made to solve the above-mentioned problems, and aims to provide an engine intake device that is less affected by condensation water that occurs due to temperature changes in the engine compartment, and can transmit intake noise of a predetermined frequency into the vehicle cabin while suppressing a decrease in volume. [Means for solving the problem]

[0008] An engine intake device according to one aspect of the present invention includes a first passage, a second passage, and an intake sound enhancement device. The first passage is a passage provided in an engine room for guiding fresh air to an engine. The second passage is a passage branching off from the middle of the first passage and extending toward a vehicle interior. The intake sound enhancement device is a device provided in the second passage for increasing intake pressure by receiving intake pulsation.

[0009] The intake noise enhancing device has a bellows portion, a vibration membrane, and an outer circumferential case. The bellows portion is cylindrical and is expandable and contractible in the axial direction. The vibration membrane is integrally formed with the bellows portion so as to close one opening of the bellows portion. and are arranged along the vertical direction. The outer circumferential case is a portion that is provided so as to cover the outer periphery of the bellows portion and allows the bellows portion to expand and contract inwardly. When a central axis that is perpendicular to the diaphragm and passes through the center of the diaphragm is defined as a first central axis, the diaphragm is disposed such that the first central axis is aligned along the front-to-rear direction of the vehicle.

[0010] The second passage is an outlet passage portion connected to a portion of the outer casing on the one opening side of the bellows portion and extending toward the vehicle interior. an introduction passage portion that is connected to another opening of the bellows portion opposite to the opening closed by the vibration membrane and that extends toward the branch portion; has.

[0011] In the engine intake system according to this aspect, the outlet passage portion is disposed so as to descend vertically downward as it moves away from the intake sound increasing device. At a connection portion with the outer circumferential case, a lower surface of the outlet passage portion is disposed at the same height or lower in the vertical direction than a lower surface of a connection portion with the outlet passage portion of the outer circumferential case, and the introduction passage portion is disposed so as to descend vertically downward as it moves away from the other opening of the bellows portion. . When the central axis of the outlet passage portion is defined as the second central axis, the intersection of the first central axis and the second central axis is located on the opening surface of the opening of the outlet passage portion on the connection side with the outer circumferential case.

[0012] In the engine intake device according to the above aspect, the outlet passage portion is disposed so as to descend vertically downward as it moves away from the intake sound amplification device, so that even if condensation occurs inside the outer circumferential case due to a temperature change in the engine room, the condensed water is easily discharged from the outer circumferential case toward the outlet passage portion. Therefore, in the engine intake device according to the above aspect, frequency change due to adhesion of condensed water to the surface of the diaphragm (the outer surface on the outlet passage portion side) is unlikely to occur, and sound volume reduction is also unlikely to occur.

[0014] Also, In the engine intake device according to the above aspect, the intersection of the first central axis and the second central axis is located on the opening surface of the outlet passage portion on the connection side with the outer casing, so that the intake sound amplified by the vibration of the vibrating membrane can be propagated to the outlet passage portion with little loss. Therefore, in the engine intake device according to the above aspect, the intake sound amplified by the intake sound amplification device can be reliably propagated to the vehicle interior. In addition, in the engine intake device according to the above aspect, the introduction passage is disposed so as to descend vertically downward as it moves away from the bellows, so that even if condensation occurs inside the bellows due to a temperature change in the engine room, the condensed water is easily discharged from the bellows to the introduction passage. Therefore, in the engine intake device according to the above aspect, frequency changes due to condensed water adhering to the inner surface of the diaphragm, etc., are unlikely to occur, and sound volume reduction is also unlikely to occur. In addition, in the engine intake device according to the above aspect, the first central axis is disposed along the front-rear direction of the vehicle, so that the diaphragm vibrates in the front-rear direction of the vehicle upon receiving the intake pressure wave. Therefore, in the engine intake device according to the above aspect, the increased pressure wave generated by the vibration of the diaphragm is propagated toward the rear passenger compartment, and the intake sound is effectively propagated to the passenger compartment. In addition, in the engine intake device according to the above aspect, the lower surface of the outlet passage portion is disposed at the same height or lower than the lower surface of the outer casing at the connection portion between the outlet passage portion and the outer casing, so that condensation water generated inside the outer casing is efficiently discharged to the outlet passage portion. Therefore, in the engine intake device according to the above aspect, it is possible to reduce the amount of condensation water remaining inside the outer casing, which is effective in suppressing the effect of condensation water on the vibration of the vibrating membrane.

[0015] In the engine intake system according to the above aspect, The above In the case where the central axis of the introduction passage portion is defined as a third central axis, an intersection point between the first central axis and the third central axis may be located on an opening plane of the other opening.

[0016] In the engine intake device according to the above aspect, the intersection of the first central axis and the third central axis is located on the opening surface of the other opening, so that the intake pressure wave propagated through the introduction passage is easily propagated to the diaphragm. Therefore, in the engine intake device according to the above aspect, the diaphragm can be effectively vibrated, and the intake sound can be propagated to the vehicle interior at a predetermined frequency related to the design while suppressing a decrease in volume. Effect of the Invention

[0023] The engine intake device according to each of the above aspects is less susceptible to the effects of condensation water that occurs with temperature changes in the engine compartment, and can transmit intake noise of a predetermined frequency into the vehicle cabin while suppressing a decrease in volume. [Brief description of the drawings]

[0024] [Figure 1] 1 is a schematic diagram showing an engine room to which an intake device for an engine according to an embodiment of the present invention is applied; [Diagram 2] 2 is a cross-sectional view showing the configuration of the intake noise enhancement device and its surroundings. FIG. [Diagram 3] FIG. 11 is a cross-sectional view showing a partial configuration of an intake device of an engine according to a modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that the embodiment described below is an example of the present invention, and the present invention is not limited to the following embodiment except for the essential configuration.

[0026] In the figures used in the following explanation, "Fr" indicates the front of the vehicle, "Re" indicates the rear of the vehicle, "Le" indicates the left side of the vehicle, "Ri" indicates the right side of the vehicle, "Up" indicates the top of the vehicle (vertically upward), and "Lo" indicates the bottom of the vehicle (vertically downward).

[0027] 1. Engine Room 1a Configuration The configuration of an engine room 1a to which an intake device 11 for an engine 10 according to an embodiment of the present invention is applied will be described with reference to FIG.

[0028] As shown in Fig. 1, an engine room 1a is provided in the front part of a vehicle 1. An engine 10 is mounted in the engine room 1a. In the vehicle 1, a passenger compartment 1b is provided behind the engine room 1a via a dash panel 1c.

[0029] An intake device 11 is attached to an engine 10 mounted in an engine room 1a. The intake device 11 includes a first passage 111, a second passage 112, and an intake sound enhancement device 120. The first passage 111 is an intake passage for supplying fresh air to each cylinder. A fresh air duct 115 is provided at one end of the first passage 111, and an air cleaner 116 and a throttle valve 117 are interposed at the rear side in the flow direction of the fresh air. Within the first passage 111, a portion upstream of the air cleaner 116 in the flow direction of the fresh air is referred to as an upstream passage section 113, and a portion downstream of the air cleaner 116 is referred to as a downstream passage section 114.

[0030] The second passage 112 is a passage provided so as to branch off from the downstream passage portion 114 at a branch portion 114a of the downstream passage portion 114. The intake sound amplification device 120 is inserted in a longitudinal midway portion of the second passage 112. In the second passage 112, a portion on the side of the branch portion 114a relative to the intake sound amplification device 120 is referred to as an introduction passage portion 118, and a portion on the opposite side of the introduction passage portion 118 across the intake sound amplification device 120 is referred to as an outlet passage portion 119. A rear pipe end portion 119a of the outlet passage portion 119 opens in the vicinity of the dash panel 1c.

[0031] The outlet passage portion 119 may be provided such that a rear portion thereof passes through the dash panel 1c and a pipe end portion 119a is disposed within the vehicle interior 1b.

[0032] 2. Intake sound enhancement device 120 and its peripheral configuration Among the components of the intake device 11, the intake sound amplification device 120 and its surrounding components will be described with reference to FIG.

[0033] 2, intake sound amplifying device 120 has cylindrical outer casing 121 and vibrating body 122 housed in outer casing 121. Vibrating body 122 has bellows portion 123 whose peripheral wall is configured in a bellows shape, and vibrating membrane 124 provided so as to close an opening on the rear side of bellows portion 123. Bellows portion 123 is expandable and contractable in the front-rear direction of vehicle 1, and vibrating membrane 124 is vibrable in the front-rear direction of vehicle 1 as shown by arrow A. Note that bellows portion 123 and vibrating membrane 124 are integrally formed.

[0034] Outer casing 121 is disposed so as not to contact the peripheral wall of bellows portion 123 and vibrating membrane 124 so as not to impede the expansion and contraction of bellows portion 123 and the vibration of vibrating membrane 124 .

[0035] An inlet passage 118 and an outlet passage 119 are connected to the intake sound boosting device 120. Of these, the inlet passage 118 is connected to an opening Op on the opposite side of the bellows portion 123 to the side where the vibration membrane 124 is provided. 123 The intake pressure wave propagated through the introduction passage 118 passes through the opening Op of the bellows 123. 123 The bellows portion 123 is introduced into the inside of the bellows portion 123 through the .

[0036] Outlet passage portion 119 is connected to a rear portion of outer circumferential case 121. Specifically, outer circumferential case 121 is formed in a state in which it extends in a direction away from bellows portion 123 beyond vibration membrane 124 provided so as to close one opening of bellows portion 123. Outlet passage portion 119 is fitted over and connected to the above-mentioned extended portion of outer circumferential case 121.

[0037] 2, in this embodiment, the diaphragm 124 is disposed along a substantially vertical direction. 124Also, the central axis of the tube constituting the introduction passage portion 118 is assumed to be the central axis Ax 118 The central axis of the pipe constituting the outlet passage portion 119 is the central axis Ax 119 Assume that.

[0038] The introduction passage portion 118 is aligned along a central axis Ax 118 and the central axis Ax 124 The intersection P1 with the opening Op of the bellows portion 123 123 The intake passage 118 is connected to the intake sound increasing device 120 so as to be located on the opening surface of the bellows portion 123. 123 The height level of the support member 10 is gradually lowered as the support member 10 moves away from the support member 10.

[0039] 2, at the connection portion between introduction passage portion 118 and bellows portion 123, lower surface 118a of introduction passage portion 118 is disposed at the same height or lower than lower surface 123a of bellows portion 123. Then, introduction passage portion 118 and bellows portion 123 are connected so that no recesses or grooves are formed between lower surface 118a of introduction passage portion 118 and lower surface 123a of bellows portion 123.

[0040] The orientation of the introduction passage portion 118 is not limited to the orientation shown in FIG. 2, and may be in a horizontal orientation or may be in a position extending in the horizontal direction. 123 It is also possible to make the height level gradually higher as the height increases from the

[0041] The outlet passage portion 119 is aligned along a central axis Ax 119 and the central axis Ax 124 The intersection P2 with the outlet passage portion 119 is the opening Op 119 The outlet passage portion 119 is also disposed in an inclined position so that its height level gradually decreases as it becomes farther away from the vibrating membrane 124.

[0042] 3.Effects In the intake device 11 according to this embodiment, the outlet passage portion 119 is disposed so as to descend vertically downward as it moves away from the intake sound amplification device 120, so that even if condensation occurs inside the outer peripheral case 121 in accordance with a temperature change in the engine room 1a, the condensed water is easily discharged from the outer peripheral case 121 toward the outlet passage portion 119. Therefore, in the intake device 11 according to this embodiment, frequency change due to adhesion of condensed water to the surface of the vibrating membrane 124 (the outer surface on the outlet passage portion 119 side) is unlikely to occur, and a decrease in volume is also unlikely to occur.

[0043] In the intake device 11 according to this embodiment, the central axis Ax 124 and the central axis Ax 119 The intersection P2 of the outlet passage portion 119 with the outer circumferential case 121 is an opening Op 119 Since the vibrating membrane 124 is disposed on the opening surface of the exhaust pipe 11, the intake sound amplified by the vibration of the vibrating membrane 124 can be propagated with little loss to the outlet passage portion 119. Therefore, in the intake device 11 according to this embodiment, the intake sound amplified by the intake sound amplification device 120 can be reliably propagated to the vehicle interior 1b.

[0044] In the intake device 11 according to this embodiment, the central axis Ax 124 and the central axis Ax 118 The intersection P1 of the bellows portion 123 with the introduction passage portion 118 is an opening Op 123 Since the vibrating membrane 124 is disposed on the opening surface of the intake passage 118, the intake pressure wave transmitted through the introduction passage 118 is easily transmitted to the vibrating membrane 124. Therefore, in the intake device 11 according to this embodiment, the vibrating membrane 124 can be effectively vibrated, and the intake sound can be transmitted to the vehicle interior 1b at a predetermined frequency related to the design.

[0045] In the intake device 11 according to this embodiment, the introduction passage 118 is disposed so as to descend vertically downward as it moves away from the bellows part 123, so that even if condensation occurs inside the bellows part 123 due to a change in temperature in the engine room 1a, the condensed water is easily discharged from the bellows part 123 toward the introduction passage 118. Therefore, in the intake device 11 according to this embodiment, frequency change due to adhesion of condensed water to the inner surface of the diaphragm 124, etc. is unlikely to occur, and a decrease in volume is also unlikely to occur.

[0046] In the intake device 11 according to this embodiment, the central axis Ax of the vibration membrane 124 124 is disposed substantially horizontally along the front-rear direction of vehicle 1, so that vibrating membrane 124 receives the intake pressure wave and vibrates in the front-rear direction of vehicle 1. Therefore, in intake device 11 according to this embodiment, the increased pressure wave generated by the vibration of vibrating membrane 124 is propagated toward passenger compartment 1b at the rear, and the intake sound is effectively propagated to passenger compartment 1b.

[0047] In intake device 11 according to the present embodiment, lower surface 118a of intake passage 118 is disposed at the same height or lower than lower surface 123a of bellows portion 123 at the connection portion between intake passage 118 and bellows portion 123, so that condensed water generated inside bellows portion 123 is efficiently discharged to intake passage 118. Therefore, intake device 11 according to the present embodiment can reduce condensed water remaining inside bellows portion 123, which is effective in suppressing the effect of condensed water on the vibration of vibrating membrane 124.

[0048] As described above, the intake device 11 of this embodiment is less susceptible to the effects of condensation water that occurs due to temperature changes in the engine compartment 1a, and can transmit intake noise of a predetermined frequency to the vehicle interior 1b while suppressing a decrease in volume.

[0049] [Variations] The configuration of the engine intake device 21 according to the modified example will be described with reference to Fig. 3. Note that the engine intake device 21 according to this modified example differs from the intake device 11 according to the above embodiment in the configurations of the outer circumferential case 221 and the outlet passage portion 219 in the intake sound enhancement device 220, but the configurations of the other parts are the same as those of the intake device 11 according to the above embodiment.

[0050] 3, in the intake device 21 according to this modified example, the lower surface 221a of the outer circumferential case 221 of the intake sound amplification device 220 is not tapered. That is, the lower surface 221a of the outer circumferential case 221 is formed as a smooth surface without any steps from the front to the rear.

[0051] In the intake device 21 according to this modified example, an outlet passage portion 219 is fitted onto the rear portion of the outer circumferential case 221. The outlet passage portion 219 is disposed in an inclined position so as to descend vertically downward as it moves away from the intake sound amplification device 220, similar to the outlet passage portion 119 of the intake device 11 according to the above embodiment.

[0052] In addition, at the connection portion of the outlet passage portion 219 with the outer peripheral case 221, the lower surface 219a of the outlet passage portion 219 is arranged at the same height or lower than the lower surface 221a of the outer peripheral case 221 in the vertical direction, and is connected in a smooth state without any steps.

[0053] The intake device 21 according to this modification can achieve the same effect as the intake device 11 according to the above embodiment. Furthermore, in the intake device 21 according to this modification, the lower surface 219a of the outlet passage portion 219 is disposed at the same height or lower than the lower surface 221a of the outer peripheral case 221 at the connection portion between the outlet passage portion 219 and the outer peripheral case 221, so that condensation water generated inside the outer peripheral case 221 is efficiently discharged to the outlet passage portion 219. Therefore, the intake device 21 according to this modification can reduce the amount of condensation water remaining inside the outer peripheral case 221, which is effective in suppressing the effect of condensation water on the vibration of the diaphragm 124.

[0054] [Other variations] In the above embodiment and the above modified example, a configuration in which the engine room 1a is provided at the front of the vehicle 1 is adopted, but the present invention is not limited to this. For example, a configuration in which the engine room is provided at the rear of the passenger compartment may also be adopted.

[0055] In the above embodiment and the above modified example, the throttle valve 117 is disposed at the rear of the engine 10, but the present invention is not limited to this. For example, the throttle valve may be disposed to the side or front of the engine.

[0056] In the above embodiment and modified example, the pipe end 119a of the outlet passage portion 119, 219 is located near the dash panel 1c in the engine compartment 1a, but the present invention is not limited to this. For example, the pipe body constituting the outlet passage portion may be inserted through the dash panel, and the pipe end may be located inside the vehicle cabin.

[0057] Although no particular reference is made to the type of engine 10 in the above embodiment and modified examples, various engines can be applied. For example, a gasoline engine or a diesel engine can be applied. A reciprocating engine or a rotary piston engine can also be adopted.

[0058] In the above embodiment and the above modified example, introduction passage portion 118 is configured to descend vertically downward as it moves away from bellows portion 123, but the present invention is not limited to this configuration for the arrangement of the introduction passage portion. For example, it is also possible to adopt a configuration in which it is arranged horizontally, or a configuration in which it rises vertically upward as it moves away from the bellows portion.

[0059] In the above embodiment and the above modification, the central axis Ax of the vibration membrane 124 124In the present invention, however, the arrangement of the diaphragm is not limited to this. For example, the diaphragm may be arranged such that its central axis is aligned vertically, or may be arranged such that its central axis is oblique to both the horizontal and vertical directions.

[0060] In the above embodiment and modified example, a configuration is adopted in which the introduction passage 118 is extended to the branching portion 114a of the downstream passage 114 in the first passage 111, but the present invention is not limited to this configuration regarding the arrangement of the introduction passage. For example, a configuration in which another passage is interposed between the branching portion of the downstream passage and the introduction passage may be adopted.

[0061] In the above embodiment and the above modified example, the outlet passage 119, 219 is extended to the vicinity of the dash panel 1c, but the present invention is not limited to this arrangement of the outlet passage. For example, it is also possible to adopt an arrangement in which a separate passage is provided that connects the portion near the dash panel with the outlet passage.

[0062] In the above embodiment and the above modified example, a single intake sound enhancement device 120, 220 is provided in the engine room 1a, but the present invention is not limited to this number of intake sound enhancement devices. For example, a plurality of intake sound enhancement devices of different sizes may be provided to allow intake sounds of different frequencies to propagate into the vehicle cabin. In this case, it is desirable to adjust the cross-sectional diameter and passage length of the inlet passage portion and outlet passage portion connected to each intake sound enhancement device according to the frequency to be obtained. [Explanation of symbols]

[0063] 1 vehicle 1a Engine Room 10 Engine 11,21 Intake system 111 1st aisle 112 2nd aisle 118 Introduction passage 119,219 Lead-out passage section 120,220 Intake sound booster 121,221 Outer case 122 Vibration Body 123 Bellows 124 Vibrating Membrane

Claims

1. a first passage provided in the engine compartment for introducing fresh air to the engine; a second passage branching off from the first passage and extending toward a vehicle interior; an intake sound increasing device provided in the second passage for increasing an intake pressure in response to intake pulsation; Equipped with The intake noise enhancing device includes a cylindrical bellows portion that is expandable and contractable in a cylindrical axial direction, a vibration membrane that is integrally formed with the bellows portion so as to close one opening of the bellows portion and that is disposed along a vertical direction, and an outer circumferential case that is provided so as to cover an outer periphery of the bellows portion and that allows the bellows portion to expand and contract inwardly, When a central axis that is perpendicular to the diaphragm and passes through a center of the diaphragm is defined as a first central axis, the diaphragm is provided such that the first central axis is disposed along a front-rear direction of the vehicle, the second passage has an outlet passage portion connected to a portion of the outer casing on the one opening side of the bellows portion and extending toward the vehicle compartment, and an introduction passage portion connected to another opening of the bellows portion on the opposite side to the opening closed by the vibration membrane and extending toward the branch portion, the outlet passage portion is disposed so as to descend vertically downward as it is spaced away from the intake sound amplification device, and at a connection portion with the outer circumferential case, a lower surface of the outlet passage portion is disposed at the same height as or lower than a lower surface of a connection portion of the outer circumferential case with the outlet passage portion, the introduction passage portion is disposed so as to descend vertically downward as it moves away from the other opening of the bellows portion, When the central axis of the outlet passage portion is defined as a second central axis, An intersection of the first central axis and the second central axis is disposed on an opening surface of the outlet passage portion at a connection side with the outer circumferential case. Engine intake system.

2. In the intake system of the engine according to claim 1, When the central axis of the introduction passage portion is defined as a third central axis, An intersection of the first central axis and the third central axis is disposed on an opening surface of the other opening. Engine intake system.

Images