Vehicle intake system

Abstract

To provide a technique for improving a silencing effect and resonator supporting strength in an air intake device in which a resonator is connected to an intake hose connected to a lid case of a body case.SOLUTION: An L-shaped air intake hose 8 is connected to a lid case 7 of an air cleaner 6. A first resonator 10 is connected to an external corner section of the air intake hose 8. A bellow section 8d causing the air intake hose 8 to be bendable is formed on the air intake hose 8 downstream of the corner section. The first resonator 10 is connected to a bracket through pins 34 and 35. The first resonator 10 has a first joint cylinder 29 and a second joint cylinder 30 which are separated from each other in a longitudinal direction of the air intake hose and fitted into boss sections 31 and 32 formed on the air intake hose 8. The first joint cylinder 29 is communicated with the air intake hose 8 and is not communicated with the second joint cylinder 30.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an intake system for a vehicle. [Background technology]

[0002] An air cleaner is used as a set in an internal combustion engine, and this air cleaner generally comprises a main case that opens upward, a lid case (cover, cap) that covers the main case from above, and a filter element that is sandwiched and fixed between the main case and the lid case. The lid case can be opened and closed in two ways: by rotating around one side edge of the lid case as a fulcrum (e.g., Patent Documents 1 and 2), or by detaching the entire lid case from the main case.

[0003] On the other hand, it is also common to provide a resonator in the intake system to reduce intake noise, and Patent Document 3 discloses connecting a resonator to an intake hose. In Patent Document 3, the resonator is a cantilever type that is simply connected to the intake hose, and is not supported by any component of the vehicle.

[0004] In both patent documents, a part of the intake hose is formed into a bellows portion, and by deforming the bellows portion, the lid case can be opened and closed with the intake hose still connected. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2018-123751 A [Patent Document 2] JP 2011-7133 A [Patent Document 3] JP 2009-203901 A Summary of the Invention [Problem to be solved by the invention]

[0006] Now, when providing a resonator in an intake system, it is preferable to connect the resonator to the intake hose that constitutes the upstream part of the intake system in order to improve the silencing function, but in order to improve the silencing function, the resonator needs to have a certain capacity. And when the capacity of the resonator becomes large, in the case of a cantilever method such as that in Patent Document 3, a large load acts on the connection part, which causes the connection part to easily break.

[0007] Therefore, if the resonator is given a certain capacity to ensure the sound-absorbing function, it needs to be supported by some kind of member via a supporting means such as a grommet. However, since the resonator moves together with the air cleaner lid case, it is very troublesome to remove the resonator from the supporting member each time the filter element is replaced.

[0008] In addition, in Patent Document 3, the resonator is connected to the intake hose at only one communicating point, but since it is connected at only one point, there is a concern that as the capacity of the resonator increases, stability will decrease and the mounting strength will decrease.

[0009] The present invention has been made to improve this current situation. [Means for solving the problem]

[0010] The intake device of the present invention comprises: "An air cleaner having a cover case attached to a main body case that opens upward so as to be freely opened and closed from above; an intake hose that is connected to the cover case of the air cleaner and bent in an L shape in a plan view; and a resonator that is disposed on the outside of an outer corner of the intake hose and connected to the intake hose. A bending deformation allowance portion for allowing the opening and closing of the lid case of the air cleaner is formed downstream of the connection portion of the intake hose with the resonator, while the resonator is supported by a support member at a portion opposite the intake hose across the connection portion with the intake hose. This is the basic configuration.

[0011] The present invention, in the above basic configuration, "The connection between the resonator and the intake hose is provided with a first connection part and a second connection part separated in the longitudinal direction of the intake hose, and these two connection parts are structured by fitting a boss part protruding from the intake hose with a joint part protruding from the resonator, and there is a gap between the intake hose and the resonator except for the two connection parts. and, The first connection portion is connected to the intake hose, and the second connection portion is connected to the intake hose. Not yet, The fitting direction of the boss portion and the joint portion constituting the connection portion is parallel to the rotation axis of the lid case when the bendable portion of the intake hose bends and the lid case of the air cleaner rotates. " That It has the following characteristics: . Effect of the Invention

[0012] In the present invention, the bending deformation allowance portion of the intake hose elastically deforms to allow the opening and closing of the lid case of the air cleaner. However, when the support structure of the embodiment is adopted, the resonator rotates, so there is no need to remove the resonator from the support member when replacing the filter element. Moreover, even if the resonator rotates in conjunction with the opening and closing of the lid case, the connection with the support member is maintained at least at the fulcrum portion. Therefore, when the filter element is replaced and the lid case is closed, the resonator automatically rotates back to its original state, maintaining the connection at multiple points.

[0013] Therefore, in the embodiment, the sound deadening effect of the resonator can be improved while allowing the filter element to be replaced quickly and easily.

[0014] In the present invention, the resonator is connected to the intake hose at two points, which significantly improves stability and the strength of the attachment to the intake hose. In the present invention, it is preferable to connect the upstream communication part to the intake hose, since this provides a high noise reduction effect. [Brief description of the drawings]

[0015] [Figure 1]FIG. 2 is a general plan view of an embodiment. [Diagram 2] 1A is a plan view of the air cleaner, and FIG. 1B is a front view of the air cleaner. [Diagram 3] (A) is a right side view of the air cleaner, and (B) is a left side view of the air cleaner. [Figure 4] (A) is a plan view of a part of an intake hose with a resonator connected thereto, (B) is a plan view of a part of the intake hose, and (C) is a partially cutaway front view of the resonator. [Diagram 5] (A) is a bottom view of the resonator, and (B) is a partially cutaway rear view of the resonator. [Figure 6] FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Next, an embodiment of the present invention will be described with reference to the drawings. In the following embodiment, the terms front, rear, left and right are used to specify directions, and these directions are defined as directions seen from the driver's perspective. The directions are clearly shown in Figure 1. A front view is a view from the direction facing the driver.

[0017] (1) Overview This embodiment is applied to an intake system for a hybrid vehicle, and the layout of the main elements in an engine room 1 is shown in the plan view of Fig. 1. In Fig. 1, reference numeral 2 denotes an engine, which is placed horizontally with its crank axis extending in the vehicle width direction. The right end of the engine 2 is formed by a chain cover 3, and its upper surface is formed by a head cover 4. Reference numeral 4a denotes a cap for an oil filler port.

[0018] A power unit (not shown) equipped with a motor is fixed to the left end surface of the engine 2, and a power control unit (PCU) 5 equipped with a battery and the like is disposed behind the power unit. The placement range of the power control unit 5 is set from the position indicated by the solid line to the position indicated by the dotted line. show Other components cannot be placed in the area where the positions overlap.

[0019] In this embodiment, the engine 2 is disposed with the exhaust side facing forward and the intake side facing backward, and therefore the intake manifold (not shown) is disposed behind the engine. An air cleaner 6 is disposed in front of the power control unit 5 on the left side of the engine 2, and a starting end of an intake hose 8 is connected to a cover case 7 of the air cleaner 6. An end of the intake hose 8 is connected to a starting end of an intake duct 9, and an end of the intake duct 9 is connected to a throttle body (not shown).

[0020] The intake hose 8 is bent into a substantially L-shape, with a first resonator 10 connected to the outer corner of the intake hose 8 and a second resonator 11 connected to the intake duct 9. The first resonator 10 corresponds to the resonator recited in the claims, and is disposed above the catalyst case (not shown). On the other hand, the second resonator 11 is disposed above the rear of the engine 2, and is supported at multiple points by brackets (not shown) provided on the engine 2.

[0021] The air cleaner 6 has a main body case (dirty chamber) 13 that opens upward, and is covered by the lid case 7 from above. The main body case 13 also has a portion that protrudes to the left of the lid case 7, and the end of an air intake duct 14 is detachably connected from above to this protruding portion. The beginning of the air intake duct 14 passes over the lid case 7 and extends toward the front right, and an air intake port 15 is provided at the front end.

[0022] The air intake 15 opens downward and is disposed between a radiator support (not shown) and a front frame 16 disposed above it. Therefore, the radiator support is disposed below the front frame 16, and the radiator is disposed below that. In Figure 1, the front surface of the vehicle body (front grill) is indicated by reference numeral 17.

[0023] (2) Air cleaner and resonator The shape of the air cleaner 6 is shown in Figures 2 and 3. As shown in Figure 2(B), the main case 13 bulges downward when viewed from the front, while the lid case 7 is nearly rectangular when viewed from the front and has a mountain-like shape when viewed from the side. As shown in Figure 3(C), a sideways T-shaped flange 19 is formed at the lower end of the lid case 7, and a frame 21 of a filter element 20 is sandwiched and fixed between the flange 19 and the upper edge of the main case 13.

[0024] The front and right edges of the lid case 7 are fixed to the main case 13 by a first connecting part 23 (see FIG. 2) that has a structure in which a downward pin (not shown) provided on the lid case 7 is inserted into a grommet provided on the main case 13, and the rear and left edges of the lid case 7 are fixed by a second connecting part 25 that uses a C-shaped clip 24, as shown in FIG. 3(C). The lower end of the clip 24 fits into a support shaft 25a provided on a reinforcing rib that constitutes the second connecting part on the main case 13, and the jaw part at the upper end is hooked and engaged with the upright wall of the flange 19 on the lid case 7. An outlet tube 26 to which the intake hose 8 is connected is provided on the right side of the lid case 7 so as to protrude rightward.

[0025] When the three clips 24 are detached from the flange 19 of the lid case 7 and the lid case 7 is lifted, the connection at the first connecting portion 23 is also released, making it possible to replace the filter element 20. When removing the lid case 7, the air intake duct 14 is also removed from the main body case 13.

[0026] The starting end of the intake hose 8 is formed into a first connection part 8a that fits from the outside into the outlet tube 26 of the lid case 7 of the air cleaner 6, and the ending end of the intake hose 8 is formed into a second connection part 8b that fits from the outside into the starting end of the intake duct 9, and both connection parts 8a, 8b are fixed to the outlet tube 26 and the intake duct 9 by hose bands (not shown).

[0027] The intake hose 8 is made of synthetic resin, and the corner portion 8c and the portion upstream thereof are basically rigid portions that do not elastically deform, while the portion between the corner portion 8c and the second connection portion 8b is a bellows portion 8d, which is an example of a portion that is permissible to bend and deform.

[0028] As can be seen from Figures 1, 4, and 5, the first resonator 10 is shaped like a generally rectangular box with a long side, and is inclined so as to become higher from front to back when viewed from the side, as shown in Figure 5(B). A first joint tube 29 that communicates with the corner portion 8c of the intake hose 8 and a second joint tube 30 that does not communicate with the intake hose 8 are provided at the left end of the first resonator 10, and these joint tubes 29, 30 are inserted into hollow first boss portion 31 and second boss portion 32 provided on the intake hose 8 and fixed with a hose band 33 (see Figure 4(A)). Therefore, in relation to the claims, the joint tubes 29, 30 form a joint portion, the first joint tube 29 and the first boss portion 31 form a first connection portion, and the second joint tube 30 and the second boss portion 32 form a second joint portion. Since the joint tubes 29, 30 protrude from the first resonator 10, and the boss portions 31, 32 protrude from the intake hose 8, there is a gap (space) between the intake hose 8 and the first resonator 10, except for the connection portions between the joint tubes 29, 30 and the boss portions 31, 32.

[0029] The first joint tube 29 is located in front (upstream side), and the second joint tube 30 is located in the rear (downstream side). The first resonator 10 is produced by blow molding, but as a means for discontinuing communication between the second joint tube 30 and the intake hose 8, the second joint tube 30 may be molded in a closed state, or may be blocked with a plug.

[0030] 4 and 5, the first resonator 10 is supported by brackets 36, 37 provided on the front frame 16 or another vehicle frame at the locations of a first pin 34 and a second pin 35 arranged separately on the left and right sides. Since Fig. 1 and Fig. 4(A) are plan views, the pins 34, 35 are hidden and cannot be seen, but for ease of understanding the positions of the pins 34, 35, the positions of the pins 34, 35 are indicated by black circles.

[0031] The pins 34, 35 are manufactured as separate members from the first resonator 10, and are fixed to the first resonator 10 by means of forced fitting, welding, or the like. For this reason, the upper ends of the pins 34, 35 are provided with substantially rectangular flanges 34a, 35b (see FIG. 5(A)) that are fixed (welded) to the first resonator 10, and these flanges 34a, 35b fit into recesses in the receiving seat 10a formed in the first resonator 10. It is possible to mold the pins 34, 35 integrally with the first resonator 10.

[0032] The brackets 36, 37 are an example of the support member described in the claims, and a hollow grommet 38 made of a soft material such as rubber is attached to the brackets 36, 37 so as not to come off, and the pins 34, 35 are inserted from above into the grommet 38. Therefore, the first resonator 10 is supported in a buffered state by the grommet 38 while being held by the pins 34, 35 so as not to slip out of place.

[0033] The first pin 34 is located near a front corner of the first resonator 10 that is located far from the intake hose 8, and the second pin 35 is located close to the front corner that is closer to the intake hose 8. In terms of height, the first pin 34 is set to be higher and the second pin 35 is set to be lower (both pins 34, 35 may be at the same height or the height relationship may be reversed).

[0034] Both pins 34, 35 are cylindrical with an opening facing downward, and a diameter-expanded expanded portion 39 is formed at the lower end. As shown in FIG. 5B, the lower end surface is cut obliquely. The first pin 34 is set to have a larger diameter than the second pin 35, and the total length of the first pin 34 is longer than the total length of the second pin 35. Specifically, the outer diameter of the first pin 34 is set to about 9 mm, and the outer diameter of the second pin 35 is set to about 8.5 mm. In terms of length, the total length of the first pin 34 is set to just under 24 mm, and the total length of the second pin 35 is set to just over 19 mm. Of course, these dimensions are merely examples, and the dimensions can be set arbitrarily according to the size of the first resonator 10, etc.

[0035] (3) Summary The intake duct 9 has a rigid structure, and the upstream portion of the intake hose 8 also has a rigid structure. Therefore, when replacing the filter element 20, the bellows portion 8d can be bent and deformed, so that the lid case 7 of the air cleaner 6 can be removed from the main body case 13 and lifted up.

[0036] Since the first resonator 10 is connected to the rigid part of the intake hose 8, when the cover case 7 is lifted, the first resonator 10 is also lifted together with the intake hose 8, but since the bellows part 8d is bent upward with the second connection part 8b as a fulcrum, the first resonator 10 rotates with the first pin 34 as a fulcrum. That is, as shown in Fig. 1 and Fig. 4, the first resonator 10 is raised and rotated with the rotation center line 40 connecting the first pin 34 of the first resonator 10 and the second connection part 8b of the intake hose 8 as a fulcrum. In other words, the fitting direction between the coupling tubes 29, 30 and the boss portions 31, 32, which are the connection parts between the first resonator 10 and the intake hose 8, is parallel to the rotation center line 40 of the lid case 7, so even if the lid case 7 is rotated, the first resonator 10 will not come off the intake hose 8, and the first resonator 10 can be raised and rotated together with the intake hose 8.

[0037] 6, the first pin 34 is hardly subjected to any lifting force and merely changes its position while fitted into the grommet 38, while the second pin 35 comes out of the grommet 38 due to the upward rotation of the first resonator 10. In other words, the upward rotation of the first resonator 10 and the lifting of the lid case 7 are permitted by the second pin 35 being removed from the grommet 38.

[0038] When the cover case 7 is closed after replacing the filter element 20, the first resonator 10 also falls and rotates about the rotation axis 40 as a fulcrum, but since the first pin 34 is fitted into the grommet 38 and the rotation fulcrum of the first resonator 10 is accurately defined, the second pin 35 fits accurately into the grommet 38 without misalignment. In this way, while providing the first resonator 10 with a high sound-deadening effect, the filter element 20 can be replaced in a state similar to that in which the first resonator 10 does not exist. Therefore, the sound-deadening performance can be significantly improved without compromising the ease of replacing the filter element 20.

[0039] Also, the cover case 7 Intake hose 8However, since the first pin 34 of the first resonator 10 is kept engaged with the grommet 38, the lid case 7 also rotates accurately around the rotation axis 40, so that when the lid case 7 is rotated back, it can be accurately fitted into the main case 13 without shifting sideways. Therefore, even though the lid case 7 is a separation type, there is also the advantage that the positioning of the lid case 7 when closed can be accurately performed.

[0040] As in the embodiment, making the second pin 35 smaller in diameter and shorter than the first pin 34 improves the performance of fitting and removing the second pin 35 into the grommet 38, which is advantageous in promoting smooth rotation of the first resonator 10.

[0041] Furthermore, it is possible to raise and rotate the first resonator 10 to a predetermined position while keeping the second pin 35 inserted in the grommet 38; however, in this case, the second pin 35 must be made considerably long and small in diameter, which may complicate the structure for holding the second pin 35 with the grommet 38 when rotated upside down. However, by adopting a method in which the second pin 35 is set short and small in diameter and inserted and removed from the grommet 38, as in the embodiment, the second pin 35 can be firmly held by the grommet 38 when the lid case 7 is closed, resulting in excellent support strength and positional stability.

[0042] In addition, since the first resonator 10 is connected to the intake hose 8 by the two joint tubes 29, 30, the support stability is significantly improved. Furthermore, when the second pin 35 is engaged with or disengaged from the grommet 38 during opening and closing of the lid case 7, a torsional force acts on the first resonator 10. However, when the first resonator 10 is connected to the intake hose 8 at two points as in this embodiment, the posture of the first resonator 10 does not change even when a torsional force acts on it, so that the second pin 35 can be accurately engaged with and disengaged from the grommet 38.

[0043] Moreover, it is preferable to dispose the first joint tube 29, which is connected to the intake hose 8, on the upstream side, since this provides a high noise reduction effect.

[0044] The present invention can be embodied in various ways other than the above-mentioned embodiment. For example, the resonator is not limited to a square shape, and various shapes such as a sphere or a rugby ball shape can be adopted. The air cleaner cover case may be rotated around one side of the cover case. The bending deformation allowance portion may be a thin-walled structure instead of a bellows portion. The bending deformation allowance portion of the intake hose may be formed of a separate member.

[0045] It is also possible to provide three or more connection parts for the resonator. For example, a three-point support structure with one first pin and two second pins, or a three-point support structure with two first pins and one first pin, etc. can be adopted. In the embodiment, the intake duct to which the end of the intake hose is connected is connected to the throttle body, but the intake duct may be connected to a supercharger. It is also possible to integrally form the bendable deformation allowable part such as a bellows part and the intake duct.

[0046] As a connection structure between the resonator and the support member, it is possible to provide a pin-shaped or other engaging protrusion on the support member, while forming an engaging hole (engaging recess) in the resonator. [Industrial Applicability]

[0047] The present invention can be embodied in an intake system for a vehicle, and therefore has industrial applicability. [Explanation of symbols]

[0048] 1. Engine Room 2 Engine 4 Head cover 5 Power Control Unit 6 Air cleaner 7 Lid Case 8. Intake Hose 9. Intake duct 10 First resonator (claimed resonator) 13 Main unit case 14 Air intake duct 16 Front Frame 23 First connection part using grommet method 25 Clip-type second connection 29,30 Configuring the Connection Joint tube (joint part) 31,32 Configuring the Connection Boss 34 1st pin 35 2nd pin 36,37 Bracket as an example of a support member 38 Grommet 40 Rotation center line

Claims

[Claim 1] The air cleaner comprises an air cleaner having a main body case that opens upward and a lid case that is attached from above so as to be freely opened and closed, an intake hose that is connected to the lid case of the air cleaner and bent in an L shape in a plan view, and a resonator that is disposed outside an outer corner of the intake hose and connected to the intake hose, A bending deformation allowance portion for allowing opening and closing of a cover case of the air cleaner is formed downstream of a connection portion of the intake hose with the resonator, while the resonator is supported by a support member at a portion opposite the intake hose across the connection portion with the intake hose, The connection portion between the resonator and the intake hose includes a first connection portion and a second connection portion separated in the longitudinal direction of the intake hose, and both connection portions are structured by fitting a boss portion protruding from the intake hose with a joint portion protruding from the resonator, and there is a gap between the intake hose and the resonator except for both connection portions; Furthermore, the first connection portion is connected to the intake hose, and the second connection portion is not connected to the intake hose, a fitting direction of the boss portion and the joint portion constituting the connection portion is parallel to a rotation axis of the lid case when the bendable portion of the intake hose is bent and the lid case of the air cleaner is rotated; Vehicle intake system.

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