Vehicle intake noise reduction structure

Abstract

The bracket (10) has a U-shaped cross section with a pair of opposing plates (15) extending from both side edges of the bottom plate (12) and is fixed to the vehicle body side to install predetermined components. The bottom plate (12) and the pair of opposing plates (15) divide the bracket inner space (16). The bottom plate (12) is provided with a through hole (20) that connects the bracket inner space (16) to the outside. The resonator (23) is fixed to the bracket (10) while being accommodated in the bracket inner space (16). The air duct (29) passes through the through hole (20) to connect the resonator (23) to the intake passage (21).

Description

Technical Field

[0001] The present disclosure relates to an intake sound reduction structure of a vehicle. Background Art

[0002] Patent Document 1 discloses a configuration in which a cab mounting bracket is provided on a rear arch fixed to a vehicle body, a cab mounting rubber is mounted on the cab mounting bracket, and the cab mounting rubber elastically supports the rear end of a floor frame on the cab side.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2003-165470 Summary of the Invention

[0006] Technical problem to be solved by the invention

[0007] In order to increase the rigidity of the bracket fixed to the vehicle body side for mounting a predetermined component, as in the cab mounting bracket of Patent Document 1, the bracket is sometimes formed into a U-shaped cross section. In this case, the interior space of the bracket tends to become useless space.

[0008] An object of the present disclosure is to provide a vehicle intake noise reduction structure capable of effectively utilizing the interior space of a bracket.

[0009] Technical means for solving technical problems

[0010] The first embodiment of the present disclosure is a vehicle intake noise reduction structure for reducing the intake noise of an intake duct that draws air into the engine, comprising a bracket, a resonator, and an air duct. The bracket has a "U"-shaped cross-section with a pair of opposing plates extending from opposite sides of a bottom plate, and is fixed to the vehicle body side for mounting predetermined components. The bottom plate and the pair of opposing plates define a space inside the bracket, and the bottom plate is provided with a through hole that connects the space inside the bracket to the outside. The resonator is fixed to the bracket while being housed in the space inside the bracket. The air duct passes through the through hole, connecting the resonator to the intake duct.

[0011] The second aspect of the present disclosure is an intake noise reduction structure according to the first aspect, wherein the vehicle is a cab-over type vehicle, and the front end of the cab is tiltably supported on the vehicle body frame about a tilt axis. The cab includes a pair of left and right supported members fixed to the front lower end or the rear lower end. The predetermined component is at least one of a pair of left and right cab brackets provided on the vehicle body to support the left and right supported members. The bracket is a cab mounting bracket, which is fixed to the vehicle body frame to mount the cab bracket.

[0012] In the above configuration, the intake passage communicates with the resonator via the air passage, and thus the intake sound of the intake passage can be reduced by the resonator.

[0013] Since the resonator is housed in the inner space of the bracket, the inner space of the bracket (the inner space of the bracket) which tends to become dead space can be effectively utilized. In addition, the resonator can be protected by the bottom plate portion and the pair of opposing plate portions.

[0014] Effects of the Invention

[0015] According to the intake sound reduction structure of the present disclosure, the internal space of the bracket can be effectively utilized. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a front view of a vehicle equipped with the intake noise reduction structure according to one embodiment of the present disclosure.

[0017] Figure 2 Viewed from the outside of the vehicle width direction (arrow II direction) Figure 1 Side view of the right side cab mounting bracket.

[0018] Figure 3 yes Figure 1 Cross-sectional view of the intake noise reduction structure.

[0019] Figure 4 yes Figure 3 Sectional view as viewed in the IV-IV direction. DETAILED DESCRIPTION

[0020] An embodiment of the present disclosure is described below based on the accompanying drawings. In the drawings, FR represents the front of the vehicle, UP represents the top of the vehicle, and IN represents the inside in the vehicle width direction. In the following description, left-right directions refer to left-right directions when facing the front of the vehicle.

[0021] Figure 1 The vehicle shown is a flat-head truck (flat-head vehicle), and the front end side of its cab 1 is tiltably supported on the vehicle body frame 2 with a tilt axis (not shown) as the center. The vehicle body frame 2 is composed of a pair of left and right side beams 3 and a plurality of cross beams 4. The pair of left and right side beams 3 extend across the front and rear of the vehicle, and the plurality of cross beams 4 extend in the vehicle width direction and connect the left and right side beams 3 to each other. The side beam 3 is a "U"-shaped cross-section that opens inward in the vehicle width direction, and integrally has a longitudinal wall portion 5, an upper wall portion 6, and a lower wall portion 7. The longitudinal wall portion 5 intersects the vehicle width direction, and the upper wall portion 6 and the lower wall portion 7 extend relatively inward in the vehicle width direction from the upper and lower end edges of the longitudinal wall portion 5. In addition, Figure 1 In FIG, only the cross member 4 at the front end of the vehicle is shown.

[0022] A pair of left and right supported members 8 are fixed to the front lower end of the cab 1, and a pair of left and right cab locking brackets (not shown) are fixed to the rear lower end of the cab 1 as rear supported members. A pair of left and right front cab brackets 9 are fixed to the vehicle body frame 2, corresponding to the left and right supported members 8 on the front side, and a pair of left and right rear cab brackets (not shown) are fixed to the left and right rear cab locking brackets on the rear side. A cab locking device (not shown) is provided inside the cab locking brackets. This cab locking device engages and locks with a striker (not shown) on the rear cab bracket. When the cab 1 is tilted from a tilted position to a non-tilted position (to lower the rear end of the cab 1), the left and right supported members 8 are placed on the left and right front cab brackets 9 on the front side, and the left and right cab locking brackets are placed on the left and right rear cab brackets on the rear side, with the strikers engaging with the left and right cab locking devices. The cab locking device engages the striker, locking the rear end of the non-tilted cab 1 to the vehicle body frame 2. Left and right front cab supports 9 are elastically supported on left and right cab mounting brackets 10 via elastic bodies 30, respectively. The left and right cab mounting brackets 10 are fixed to the left and right side members 3, respectively.

[0023] The example of this embodiment is a front air intake specification, and an air intake duct 21 is provided between the left and right cab mounting brackets 10 and to the right of the center in the vehicle width direction (inner side (left side) of the right cab mounting bracket 10 in the vehicle width direction). The air intake duct 21 is used to take air into the engine (not shown) of the vehicle. The engine is arranged below the cab 1, and the engine and the air intake duct 21 are respectively fixed to the vehicle body frame 2. The air intake duct 21 extends in the up-down direction on the front side of the cab 1 and has an air intake port (not shown) at its upper part. The air flowing in from the air intake port circulates from top to bottom in the air intake duct 21 and is supplied to the engine from the lower end of the air intake duct 21 via an air intake connecting pipe (not shown).

[0024] like Figures 2 to 4As shown, the cab mounting bracket 10 integrally comprises a fixed plate portion 11, which is fixed to the longitudinal wall portion 5 of the side member 3 from the vehicle width outer side in an overlapping manner; an inclined plate portion 12, which extends obliquely upward and outward from the upper end edge of the fixed plate portion 11; a frame support plate portion 13, which extends outward from the upper end edge of the inclined plate portion 12; a front plate portion 14, which extends outward from the front end edges of the fixed plate portion 11 and the inclined plate portion 12; and a rear plate portion 15, which extends outward from the rear end edges of the fixed plate portion 11 and the inclined plate portion 12. The upper end edge of the front plate portion 14 is continuous with the front end edge of the frame support plate portion 13, while the upper end edge of the rear plate portion 15 is continuous with the rear end edge of the frame support plate portion 13. The front plate portion 14 and the rear plate portion 15 are spaced apart from each other in front and rear directions and face each other. The frame support plate portion 13 is arranged substantially horizontally, and the front cab bracket 9 is placed and fixed on the upper surface of the frame support plate portion 13 via an elastic body 30 .

[0025] As described above, the cab mounting bracket 10 of this embodiment comprises a bracket having a U-shaped cross-section, with a pair of opposing plates (front plate 14 and rear plate 15) extending from the two side edges (front and rear edges) of the bottom plate (inclined plate 12). The bracket is secured to the vehicle body for mounting a predetermined component (front cab bracket 9). The inclined plate 12, front plate 14, and rear plate 15, along with the fixed plate 11 and the frame support plate 13, define a bracket interior space 16.

[0026] A plurality of bolt insertion holes 17 (four locations, front, rear, left, and right, in this embodiment) are formed in the vertical wall portion 5 of the side sill 3 and the fixing plate portion 11 of the cab mounting bracket 10. These bolt insertion holes 17 extend through the fixing plate portion 11 in the vehicle width direction when the fixing plate portion 11 is overlapped with the vertical wall portion 5 from the vehicle width direction outer side. By overlapping the fixing plate portion 11 with the vertical wall portion 5 from the vehicle width direction outer side, bolts 18 are inserted through the bolt insertion holes 17 and screwed together with nuts 19 for tightening, thereby securing the fixing plate portion 11 to the side sill 3.

[0027] A circular through-hole 20 is formed in the inclined plate portion 12 of the right cab mounting bracket 10. This circular through-hole 20 connects the bracket's internal space 16 with the exterior (the vehicle widthwise inner side of the inclined plate portion 12). The inner diameter of through-hole 20 is set slightly larger than the outer diameter of a resonator-side connecting pipe portion 24, described later. The resonator-side connecting pipe portion 24 is inserted through through-hole 20.

[0028] A duct-side connecting pipe portion 22 is integrally provided at the lower portion of the intake duct 21. The duct-side connecting pipe portion 22 is a circular tube protruding from the outer peripheral surface of the intake duct 21 and connects the inside of the intake duct 21 with the outside.

[0029] A resonator (resonance box) 23 is housed in the inner space 16 of the right cab mounting bracket 10, whichever is closer to the air intake duct 21. The shape, internal structure, and material of the resonator 23 can be arbitrarily set. Alternatively, the through-hole 20 may be provided in the left cab mounting bracket 10, so that the resonator 23 is housed in the inner space 16 of the left cab mounting bracket 10.

[0030] The resonator 23 is integrally provided with a resonator-side connecting pipe portion 24. This is a circular tube protruding from the outer surface of the resonator 23, connecting the enclosed space within the resonator 23 to the outside. A male thread 26, which is threadably engaged with a nut 25, is formed on the outer circumference of the middle portion of the resonator-side connecting pipe portion 24. By inserting the front end of the resonator-side connecting pipe portion 24 from the outside in the vehicle width direction through the through-hole 20 of the inclined plate portion 12 of the cab mounting bracket 10 and screwing and tightening the nut 25 from the inside in the vehicle width direction onto the male thread 26, the resonator 23 is secured to the cab mounting bracket 10 while being housed in the bracket's inner space 16.

[0031] The intake duct 21 and the resonator 23 are both made of resin and connected by a resonator connecting pipe 27. The resonator connecting pipe 27 is made, for example, of a rubber tube having an inner diameter slightly smaller than the outer diameters of the duct-side connecting pipe portion 22 and the resonator-side connecting pipe portion 24. The duct-side connecting pipe portion 22 and the resonator-side connecting pipe portion 24 are respectively pressed and inserted into the ends of the resonator connecting pipe 27. The outer circumferences of the resonator connecting pipe 27, which have expanded in diameter due to elastic deformation, are then fastened with binding bands 28 or the like, thereby securing the ends of the resonator connecting pipe 27 to the connecting pipe portions 22 and 24. The duct-side connecting pipe portion 22, the resonator-side connecting pipe portion 24, and the resonator connecting pipe 27 form an air passage 29 that passes through the through-hole 20 and connects the resonator 23 with the intake duct 21. The intake duct 21 and the resonator 23 are not limited to being made of resin, and the resonator connecting pipe 27 is not limited to being made of rubber.

[0032] According to the present embodiment, the intake passage 21 communicates with the resonator 23 via the air passage 29 . Therefore, the intake sound of the intake passage 21 can be reduced by the resonator 23 .

[0033] Since the resonator 23 is accommodated in the bracket inner space 16 , the bracket inner space 16 (the inner space of the cab mounting bracket 10 ), which tends to become a useless space, can be effectively utilized.

[0034] Since resonator 23 is covered by the plates of cab mounting bracket 10 (fixed plate 11 , inclined plate 12 , frame support plate 13 , front plate 14 , and rear plate 15 ), resonator 23 can be protected by cab mounting bracket 10 .

[0035] Furthermore, since the resonator 23 can be fixed to the cab mounting bracket 10 by tightening the nut 25 to the male thread 26 of the resonator-side connecting pipe portion 24 , the assembly operation of the resonator 23 can be easily performed.

[0036] While the present disclosure has been described above based on the aforementioned embodiments, the present disclosure is not limited to the contents of the aforementioned embodiments and can, of course, be modified as appropriate without departing from the scope of the present invention. In other words, other embodiments, examples, and applied technologies accomplished by those skilled in the art based on the present embodiments are, of course, all encompassed within the scope of the present invention.

[0037] For example, while the above embodiment describes a front-intake configuration, the air intake duct 21 may also be a rear-intake configuration, extending vertically along the rear surface of the cab 1. In this case, the resonator 23 may be housed within the space inside the cab mounting bracket supporting the rear side of the rear cab frame.

[0038] Furthermore, the internal space of a bracket other than the cab mounting bracket 10 , which is fixed to the vehicle body side for mounting predetermined components, may be utilized as a space for accommodating the resonator 23 .

[0039] This application is based on Japanese patent application (Japanese Patent Application No. 2020-009792) filed on January 24, 2020, the contents of which are incorporated herein by reference.

[0040] Industrial Availability

[0041] The present disclosure can be applied to a vehicle including a bracket fixed to a vehicle body side for mounting a predetermined component.

[0042] Description of Reference Numerals

[0043] 1 Cab

[0044] 2 Body frame

[0045] 3 side members

[0046] 4 beams

[0047] 5. Longitudinal wall

[0048] 6 Upper wall

[0049] 7 Lower wall

[0050] 8 Supported components

[0051] 9 Front cab bracket (predetermined component)

[0052] 10 Cab mounting bracket (bracket)

[0053] 11 Fixed plate

[0054] 12 Inclined plate (bottom plate)

[0055] 13 support panels

[0056] 14 Front panel (opposite panel)

[0057] 15 Rear plate (opposite plate)

[0058] 16 Space inside the bracket

[0059] 17 Bolt insertion hole

[0060] 18 bolts

[0061] 19, 25 nuts

[0062] 20 through holes

[0063] 21 Intake duct

[0064] 22 Channel side connecting pipe

[0065] 23 Resonator

[0066] 24 Resonator side connecting pipe

[0067] 26 male thread

[0068] 27 Resonator connecting pipe

[0069] 28 strapping

[0070] 29 ventilation path

[0071] 30 Elastomer

Claims

1. A vehicle intake noise reduction structure for reducing the intake noise of an intake passage for taking air into an engine, characterized in that: include: The bracket has a U-shaped cross-section with a pair of opposing plates extending from both side edges of a bottom plate. The bottom plate and the pair of opposing plates define a space inside the bracket. The bottom plate is provided with a through hole that connects the space inside the bracket to the outside. The bracket is fixed to the vehicle body side to mount a predetermined component. a resonator fixed to the bracket while being accommodated in the inner space of the bracket, and An air passage passes through the through hole to connect the resonator with the intake passage.

2. The intake noise reduction structure according to claim 1, wherein: The vehicle is a cab-over type vehicle, the front end of which is supported on the vehicle body frame so as to be tiltable about a tilt axis. The cab includes a pair of left and right supported members, which are fixed to the front lower end portion or the rear lower end portion; The predetermined component is at least one of a pair of left and right cab brackets, which are provided on the vehicle body side to support the pair of left and right supported members; The bracket is a cab mounting bracket, which is fixed to the vehicle body frame to mount the cab bracket.

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