Sound-absorbing structure for vehicle drivetrain

Abstract

To provide a sound absorption structure of a vehicle drive device which enables reduction of working hours for attaching a sound absorption member to a bracket to improve workability of attachment work of the sound absorption member.SOLUTION: In a sound absorption structure of a transfer device 14, a front sound absorption member 24 is attached to a right bracket 22 which attaches the transfer device 14 to a right side frame. The front sound absorption member 24 has: a cylindrical part 24E into which the right bracket 22 is inserted; and an engagement protruding part 24I which engages with the right bracket 22. Further, a cover member 26 is provided that has a cylindrical part 26E which covers an outer periphery part of the cylindrical part 24E and presses the engagement protruding part 24I to the right bracket 22 with the cylindrical part 26E.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a sound absorbing structure for a vehicle drive unit. [Background technology]

[0002] BACKGROUND ART Conventionally, a transmission case for a work vehicle described in Patent Document 1 is known as a sound absorbing structure for a vehicle drive unit.

[0003] The transmission case of a work vehicle described in Patent Document 1 incorporates a hydraulic continuously variable transmission and has a rear wall that covers the rear side of the hydraulic continuously variable transmission.The transmission case is equipped with an annular rib that protrudes rearward from the rear wall, and a blocking member that is attached to the rear end face of the annular rib and blocks its opening, and a sound-absorbing member is arranged inside the annular rib.

[0004] The transmission case of the work vehicle described in Patent Document 1 can reduce transmitted sound by using a sound-absorbing member disposed inside the annular rib that is in a closed state. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-265933 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the conventional transmission case for a work vehicle described in Patent Document 1, a blocking member is required to attach the sound absorbing member, and the blocking member must be fixed to the annular rib with bolts.

[0007] This increases the number of steps required to attach the sound absorbing member to the hydraulic continuously variable transmission, which may result in a decrease in the workability of the sound absorbing member attachment work.

[0008] The present invention has been made in light of the above-mentioned circumstances, and aims to provide a sound-absorbing structure for a vehicle drive unit that can reduce the amount of work required to attach a sound-absorbing member to a bracket and improve the ease of attaching the sound-absorbing member. [Means for solving the problem]

[0009] The present invention provides a sound absorbing structure for a vehicle drive unit in which a sound absorbing member is attached to a bracket that attaches the vehicle drive unit to a vehicle body, the sound absorbing member being a first sound absorbing member having a first cylindrical portion into which the bracket is inserted and a first engaging portion that engages with the bracket. a second sound-absorbing member provided separately from the first sound-absorbing member and having a third cylindrical portion into which the bracket is inserted; It is equipped with one end of the first sound-absorbing member and one end of the second sound-absorbing member are in contact with each other in the extending direction of the bracket, A cover member is disposed on the sound absorbing member, and the cover member has a second cylindrical portion that covers the outer periphery of the first cylindrical portion, and the second cylindrical portion presses the first engaging portion against the bracket. and covers the contact points between the first sound-absorbing member and the second sound-absorbing member. It is characterized by: [Effects of the Invention]

[0010] As described above, according to the present invention, the number of steps required to attach the sound absorbing member to the bracket can be reduced, and the workability of the sound absorbing member attachment work can be improved. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a plan view of a vehicle equipped with a sound absorbing structure for a vehicle drive device according to one embodiment of the present invention. [Figure 2] FIG. 2 is a plan view of a transfer unit, a left bracket, and a right bracket equipped with a sound absorbing structure for a vehicle drive system according to one embodiment of the present invention. [Figure 3] FIG. 3 is a bottom view of a transfer device, a left bracket, and a right bracket provided with a sound absorbing structure for a vehicle drive device according to one embodiment of the present invention. [Figure 4] FIG. 4 is a diagram showing a sound absorbing structure for a vehicle drive device according to one embodiment of the present invention, and is an exploded perspective view of a left bracket and a sound absorbing member. [Figure 5] FIG. 5 is a diagram showing a sound absorbing structure for a vehicle drive device according to one embodiment of the present invention, and is a plan view of a left bracket and a sound absorbing member. [Figure 6] FIG. 6 is a diagram showing a sound absorbing structure for a vehicle drive device according to one embodiment of the present invention, and is a bottom view of a left bracket and a sound absorbing member. [Figure 7] 7 is a cross-sectional view taken along the line VII-VII in FIG. [Figure 8] FIG. 8 is a diagram showing a sound absorbing structure for a vehicle drive device according to one embodiment of the present invention, and is a perspective view of a right bracket, a front sound absorbing member, a rear sound absorbing member, and a cover member. [Figure 9] FIG. 9 is a diagram showing a sound absorbing structure for a vehicle drive device according to one embodiment of the present invention, and is an exploded perspective view of a right bracket, a front sound absorbing member, a cover member, and a rear sound absorbing member. [Figure 10] 10 is a cross-sectional perspective view taken along the arrow XX in FIG. 2. FIG. [Figure 11] 11 is a cross-sectional perspective view taken along the line XI-XI in FIG. 2. FIG. [Figure 12] FIG. 12 is a diagram showing a sound absorbing structure for a vehicle drive device according to one embodiment of the present invention, and is a perspective view of a front sound absorbing member. [Figure 13] FIG. 13 is a diagram showing a sound absorbing structure for a vehicle drive unit according to one embodiment of the present invention, and is a bottom view of the right bracket. DETAILED DESCRIPTION OF THE INVENTION

[0012] A sound-absorbing structure for a vehicle drive unit according to one embodiment of the present invention is a sound-absorbing structure for a vehicle drive unit in which a sound-absorbing member is attached to a bracket that mounts the vehicle drive unit to a vehicle body, the sound-absorbing member comprising a first sound-absorbing member having a first cylindrical portion into which the bracket is inserted and a first engagement portion that engages with the bracket, and a cover member is disposed on the sound-absorbing member, the cover member having a second cylindrical portion that covers the outer periphery of the first cylindrical portion, and the second cylindrical portion presses the first engagement portion against the bracket.

[0013] As a result, the sound absorbing structure for a vehicle drive unit according to one embodiment of the present invention can reduce the number of steps required to attach the sound absorbing member to the bracket, thereby improving the workability of the sound absorbing member attachment work. [Example]

[0014] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A sound absorbing structure for a vehicle drive unit according to an embodiment of the present invention will now be described with reference to the drawings.

[0015] 1 to 13 are diagrams showing a sound absorbing structure for a vehicle drive device according to one embodiment of the present invention. In Fig. 1 to 13, the up / down, front / rear, left / right directions are based on the vehicle drive device when placed in a vehicle, and the front / rear direction of the vehicle is defined as the front / rear direction, the left / right direction of the vehicle (vehicle width direction) is defined as the left / right direction, and the up / down direction of the vehicle (vehicle height direction) is defined as the up / down direction.

[0016] First, the configuration will be described. In Figure 1, vehicle 1 has a left side frame 2 and a right side frame 3, which are spaced apart in the width direction of vehicle 1 (hereinafter simply referred to as the vehicle width direction) and extend in the fore-and-aft direction of vehicle 1.

[0017] The left side frame 2 and the right side frame 3 are connected by a front cross member 5, a center cross member 6, and rear cross members 7 and 8, which extend in the vehicle width direction. The center cross member 6 is formed in an X shape in a plan view.

[0018] The vehicle 1 is provided with a powertrain 10. The powertrain 10 has an engine 11, which is an internal combustion engine, and a transmission 12 that changes the rotational speed of a crankshaft (not shown) of the engine 11 and outputs the rotational speed.

[0019] The engine 11 is disposed longitudinally so that the rotational center axis of the crankshaft extends in the front-rear direction of the vehicle 1.

[0020] The front end of a propeller shaft 13 is connected to the transmission 12, and the propeller shaft 13 extends from the transmission 12 toward the rear of the vehicle 1. A transfer device 14 serving as a vehicle drive device is disposed behind the transmission 12, and the rear end of the propeller shaft 13 is connected to the transfer device 14.

[0021] As a result, the power of the engine 11 whose speed has been changed by the transmission 12 is transmitted to the transfer device 14 via the propeller shaft 13 .

[0022] The transfer device 14 has an input shaft to which the rear end of the propeller shaft 13 is connected, and an output shaft that is arranged parallel to the input shaft and is connected to the input shaft via gears or the like. The input shaft of the transfer device 14 is arranged longitudinally near the center of the left and right sides of the vehicle 1 so that its central axis of rotation extends in the fore-and-aft direction of the vehicle 1.

[0023] The output shaft of the transfer device 14 is disposed longitudinally on the right side of the vehicle 1, between the input shaft and the right side frame 3, with its central axis of rotation extending in the fore-and-aft direction of the vehicle 1. The rear end of the front propeller shaft 15 is connected to the front end of the output shaft of the transfer device 14.

[0024] The front end of the rear propeller shaft 16 is connected to the rear end of the output shaft of the transfer device 14. As a result, the mass of the transfer device 14 is concentrated on the right side where the output shaft is located, which affects the vibration characteristics.

[0025] The front propeller shaft 15 extends from the transfer device 14 to the side of the powertrain 10 toward the front of the vehicle 1 .

[0026] The front end of the front propeller shaft 15 is connected to a front differential device 17 located on the lower right of the powertrain 10. The front differential device 17 transmits the power of the front propeller shaft 15 to the front wheels (not shown) via left and right drive shafts (not shown) in a manner that allows differential rotation.

[0027] The rear end of the rear propeller shaft 16 is connected to a rear differential device (not shown). The rear differential device transmits the power of the rear propeller shaft 16 to the rear wheels (not shown) via left and right drive shafts (not shown) in a manner that allows differential rotation.

[0028] The transfer device 14 is provided with a switching lever 19, which the driver can operate to select between neutral, which outputs no driving force, two-wheel drive, which drives only the rear wheels, and four-wheel drive, which drives both the front and rear wheels. Furthermore, the reduction ratio can be switched between high and low speeds.

[0029] When the driver operates the switching lever 19 to select either two-wheel drive or four-wheel drive, the transfer device 14 switches the transmission path to either a two-wheel drive state in which the power transmitted from the propeller shaft 13 is not transmitted to the front propeller shaft 15, or a four-wheel drive state in which the power is also transmitted to the front propeller shaft 15.

[0030] This allows the vehicle 1 to be configured as a part-time 4WD that can be switched between two-wheel drive and four-wheel drive. Note that the transfer device 14 may also be configured to provide a power transmission path that constantly drives the vehicle 1 in four-wheel drive mode, i.e., as a full-time 4WD.

[0031] The left side frame 2 and the transfer device 14 are connected by a left bracket 21 made of metal.

[0032] The left bracket 21 extends leftward from the transfer device 14, and its left end 21a is elastically connected to the left side frame 2 via a mount member (not shown).

[0033] The right end 21b of the left bracket 21 is fixed by a bolt to a connecting portion 14B formed on the left side surface of the case 14A of the transfer device 14. In this embodiment, the left end 21a of the left bracket 21 forms one end of the bracket, and the right end 21b of the left bracket 21 forms the other end of the bracket.

[0034] 3, a connecting portion 21G is provided on the right end portion 21b of the left bracket 21. The connecting portion 21G has an attachment surface facing upward to the upper right, and the connecting portion 21G is attached to the transfer device 14 by having the attachment surface fixed to the connecting portion 14B of the case 14A with a bolt (not shown).

[0035] That is, a connecting portion 14B to which a connecting portion 21G of the left bracket 21 is fixed is provided on the left side surface of a case 14A of the transfer device 14.

[0036] 1, the right side frame 3 and the transfer device 14 are connected by a metal right bracket 22. The right bracket 22 extends in the front-rear direction along the right side frame 3 on the left side of the right side frame 3, and its central portion in the front-rear direction is fixed to the transfer device 14.

[0037] The front end 22a of the right bracket 22 is elastically connected to the right side frame 3 via a mounting member not shown, and the rear end 22b of the right bracket 22 is elastically connected to the right side frame 3 via a mounting member not shown.

[0038] In this embodiment, the left side frame 2, the right side frame 3 and the central cross member 6 form a vehicle body, and the left bracket 21 and the right bracket 22 form a bracket.

[0039] As shown in Figures 4 and 6, the left bracket 21 has an upper wall 21A, a front wall 21B extending downward from the front edge of the upper wall 21A, and a rear wall 21C extending downward from the rear edge of the upper wall 21A, and is formed in an approximately U-shape that opens downward in a cross section perpendicular to the vehicle width direction.

[0040] 3 and 6, a longitudinal rib 21D extending along the longitudinal direction of the vehicle is formed on the inner surface of the left bracket 21. The longitudinal rib 21D connects the front wall 21B and the rear wall 21C.

[0041] Furthermore, a vehicle width rib 21E extending in the left-right direction of the vehicle is formed on the inner surface of the left bracket 21. The vehicle width rib 21E extends in the vehicle width direction so as to connect the front-rear rib 21D to the center portion in the front-rear direction between the front wall 21B and the rear wall 21C.

[0042] The left bracket 21 has high rigidity due to being reinforced by the longitudinal rib 21D and the vehicle width rib 21E.

[0043] As shown in Figures 3 and 6, the length of the left bracket 21 in the front-to-rear direction is shorter on the left side frame 2 side (left end 21a side) and longer on the transfer device 14 side (right end 21b side) than on the left side frame 2 side.

[0044] As shown in Figures 4, 5 and 7, a boss portion 21F is provided on the upper wall 21A of the left bracket 21, and the boss portion 21F protrudes obliquely upward to the right from the upper wall 21A toward the transfer device 14 (see Figure 2).

[0045] That is, the boss portion 21F is formed with a mounting surface for mounting a component, and the boss portion 21F extends obliquely from the upper wall 21A so that this mounting surface protrudes toward the transfer device 14.

[0046] 2, a clamp 41A for a switch cord 41 is attached to the upper end of the boss portion 21F. The switch cord 41 connects the transfer device 14 to a controller (not shown), and the clamp 41A holds the switch cord 41 and is attached and fixed to the boss portion 21F using a bolt or the like.

[0047] The switch cord 41 transmits a signal corresponding to the switching position of the switching lever 19 from the transfer device 14 to the controller. The boss portion 21F of this embodiment constitutes a protrusion, and the clamp 41A constitutes a predetermined in-vehicle part.

[0048] As shown in FIGS. 2 and 9, a connecting portion 22F is provided on the left edge of the center portion in the front-rear direction of the right bracket 22 so as to protrude upward.

[0049] As shown in FIG. 2, a connecting portion 14C is provided on the right side surface of a case 14A of the transfer device 14, and a connecting portion 22F of the right bracket 22 is fixed to the connecting portion 14C with a bolt (not shown).

[0050] In this way, the transfer device 14 is elastically supported on the left side frame 2 via the left bracket 21 and on the right side frame 3 via the right bracket 22 .

[0051] As shown in Figures 9, 10, and 13, the right bracket 22 has an upper wall 22A, a left wall 22B extending downward from the left edge of the upper wall 22A, and a right wall 22C extending downward from the right edge of the upper wall 22A, and is formed in an approximately U-shape that opens downward in a cross section perpendicular to the front-to-rear direction.

[0052] 13, a plurality of inclined ribs 22D are formed on the inner surface (lower surface) of the right bracket 22 between the left wall 22B and the right wall 22C so as to connect the left wall 22B and the right wall 22C. The inclined ribs 22D are inclined with respect to the extension directions of the left wall 22B, the right wall 22C, and the right bracket 22.

[0053] The inclined ribs 22D are formed so as to intersect in an X-shape when viewed from below on the right bracket 22, and the X-shaped inclined ribs 22D are arranged continuously in the front-rear direction.

[0054] A longitudinal rib 22E is provided in the center in the vehicle width direction between the left wall 22B and the right wall 22C on the inner surface (lower surface) of the front side of the right bracket 22. The longitudinal rib 22E extends in the same direction as the extension of the right bracket 22 so as to connect the intersections of the inclined ribs 22D.

[0055] As shown in Figure 9, the connecting portion 22F protrudes upward from the upper wall 22A of the right bracket 22, and the width of the right bracket 22 in the vehicle width direction is formed such that the front width is narrower than the rear width and the rear width is wider than the front width forward of the connecting portion 22F.

[0056] The width of the right bracket 22 in the vehicle width direction is formed such that the width at the front side is wider and the width at the rear side is narrower than the width at the front side behind the connecting portion 22F.

[0057] That is, the width of the right bracket 22 in the vehicle width direction is widest near the connecting portion 22F, and is gradually narrowed from near the connecting portion 22F toward the front end portion 22a or the rear end portion 22b.

[0058] The length of the right bracket 22 in the front-rear direction is formed so that the length from the connecting portion 22F to the rear side is shorter than the length from the connecting portion 22F to the front side.

[0059] As shown in FIGS. 2 and 3, a sound absorbing member 23 made of an elastic material such as polyurethane rubber is attached to the left bracket 21.

[0060] The sound-absorbing member 23 has an upper wall 23A that abuts against the upper wall 21A of the left bracket 21, a front wall 23B that extends downward from the front edge of the upper wall 23A and abuts against the front wall 21B of the left bracket 21, and a rear wall 23C that extends downward from the rear edge of the upper wall 23A and abuts against the rear wall 21C of the left bracket 21.

[0061] That is, the sound-absorbing member 23 covers the left bracket 21 from above and abuts against all surfaces to suppress vibration and also suppress sound radiation upward toward the passenger compartment. Similar to the left bracket 21, the length of the sound-absorbing member 23 in the front-to-rear direction is shorter on the left side frame 2 side and longer on the transfer device 14 side relative to the left side frame 2 side.

[0062] 6 and 7, a cylindrical portion 23G is provided on the left side of sound absorbing member 23. Cylindrical portion 23G includes a left end portion of top wall 23A, a left end portion of front wall 23B, a left end portion of rear wall 23C, and a bottom wall 23D that connects the lower end of the left end portion of front wall 23B and the lower end of the left end portion of rear wall 23C.

[0063] In other words, the cylindrical portion 23G is composed of an upper wall 23A, a front wall 23B, a rear wall 23C, and a bottom wall 23D, and is arranged to surround the outer periphery of the left end portion 21a of the left bracket 21, and abuts against the outer periphery of the left bracket 21.

[0064] The cylindrical portion 23G into which the left bracket 21 is inserted is formed so that the inner dimension (opening width) on the left end 21a side of the left bracket 21 is smaller than the inner dimension (opening width) on the right end 21b side (transfer device 14 side) of the left bracket 21.

[0065] As a result, the sound absorbing member 23 is configured to be detachable from the left end 21 a of the left bracket 21 attached to the transfer device 14 .

[0066] The sound absorbing member 23 includes a sound absorbing member main body 23H. The sound absorbing member main body 23H is composed of the top wall 23A, front wall 23B, and rear wall 23C of the sound absorbing member 23 excluding the cylindrical portion 23G, and extends from the cylindrical portion 23G along the left bracket 21 to the transfer device 14.

[0067] That is, sound absorbing member main body 23H extends from tubular portion 23G along left bracket 21 in the direction in which left bracket 21 extends.

[0068] As shown in Figure 4, the sound-absorbing material main body 23H is formed in a roughly U-shape that opens downward in a cross section perpendicular to the vehicle width direction, and the upper wall 23A, front wall 23B and rear wall 23C of the sound-absorbing material main body 23H abut against the upper wall 21A, front wall 21B and rear wall 21C of the left bracket 21.

[0069] That is, the lower side of sound absorbing member main body 23H is open, and the lower surface of left bracket 21 is not covered by sound absorbing member main body 23H even when sound absorbing member main body 23H is attached.

[0070] That is, the portion of the left bracket 21 on the right end 21b side is covered from above by the sound absorbing material main body 23H, which abuts against it to suppress vibration and also to suppress sound radiation upward to the passenger compartment.

[0071] As shown in Figure 1, vehicle 1 is provided with an exhaust pipe 42. Exhaust pipe 42 extends rearward from the left side of engine 11 along the left side of vehicle 1, and discharges exhaust gas emitted from engine 11 to the rear of vehicle 1. A catalyst 43 and a silencer 44 are attached to exhaust pipe 42, with catalyst 43 purifying the exhaust and silencer 44 muffling exhaust noise.

[0072] 1 and 2, the exhaust pipe 42 passes below the left bracket 21 in the front-to-rear direction, and the sound-absorbing material main body 23H is located above the exhaust pipe 42. In other words, the bottom wall 23D is not located above the exhaust pipe 42, and the tubular portion 23G and the exhaust pipe 42 are spaced apart in the vehicle width direction in a top view.

[0073] That is, the left bracket 21 located directly above the exhaust pipe 42 is not covered below by the sound absorbing material main body 23H, and is exposed to the exhaust pipe 42 and is directly exposed to the heat of the exhaust pipe 42.

[0074] Furthermore, the sound absorbing member 23 does not face the exhaust pipe 42 in the vertical direction, so that the hot air rising from the exhaust pipe 42 is prevented from directly acting on the sound absorbing member 23.

[0075] 4 and 5, a hole 23a is formed in the upper wall 23A of the sound absorbing member main body 23H. The boss 21F of the left bracket 21 is inserted into the hole 23a and protrudes from the hole 23a outward from the sound absorbing member 23. The sound absorbing member 23 is engaged with the boss 21F at the hole 23a.

[0076] 2, the width of clamp 41A of switch cord 41 in the vehicle width direction is set to be larger than the width of hole 23a in the vehicle width direction. That is, clamp 41A, whose width in the vehicle width direction is larger than the width of hole 23a in the vehicle width direction, is attached to boss portion 21F. This prevents sound absorbing member 23 from coming off boss portion 21F.

[0077] The boss portion 21F is formed with a fitting portion 21f (see Figures 4 and 5) into which the clamp 41A is fitted. The fitting portion 21f serves to position the clamp 41A and regulate its posture, and also prevents the clamp 41A from coming off the boss portion 21F even if a large external force is applied to the clamp 41A.

[0078] 4 and 5, a thin plate portion 23E is formed on the upper wall 23A of the sound absorbing member main body 23H on the transfer device 14 side in the range from the hole 23a to the right edge, and the thin plate portion 23E is formed to have a thickness thinner than the thickness of the upper wall 21A (see FIG. 7). The thin plate portion 23E is located below the upper surface of the upper wall 23A of the sound absorbing member main body 23H.

[0079] 4, the left edge of thin plate portion 23E forms part of the periphery of hole 23a. In other words, hole 23a is surrounded by upper wall 23A of sound absorbing member main body 23H and the left edge of thin plate portion 23E.

[0080] As shown in Figure 5, the front and rear of the thin plate portion 23E are connected to the upper wall 23A of the sound-absorbing material main body portion 23H by the front end portion 23b and the rear end portion 23c, and a slit 23s extending in the vehicle width direction from the hole 23a to the right edge is formed in the center of the thin plate portion 23E in the front-to-rear direction.

[0081] When the sound-absorbing member 23 is attached to the left bracket 21, the boss portion 21F and the hole 23a approach each other and the boss portion 21F comes into contact with the thin plate portion 23E. As a result, the boss portion 21F pushes up the thin plate portion 23E, and the thin plate portion 23E elastically deforms so that the slit 23s in the thin plate portion 23E opens. As a result, the boss portion 21F passes through the thin plate portion 23E, and the boss portion 21F can be easily inserted into the hole 23a.

[0082] That is, thin plate portion 23E easily elastically deforms when an external force is applied to insert boss portion 21F into hole 23a when sound absorbing member 23 is attached to left bracket 21. After sound absorbing member 23 is attached to left bracket 21, thin plate portion 23E returns to its original position and enters the lower right side of boss portion 21F to engage with boss portion 21F (see FIG. 7).

[0083] The thin plate portion 23E has a hardness that prevents deformation even when vibrations are applied to the sound absorbing member 23 from the left bracket 21 when the vehicle 1 is traveling, etc.

[0084] As shown in FIGS. 8 and 9, a front sound absorbing member 24 made of an elastic material such as polyurethane rubber is attached to the right bracket 22 in front of the connecting portion 22F.

[0085] As shown in Figures 8, 11, and 12, the front sound-absorbing member 24 comprises an upper wall 24A that abuts against the upper wall 22A of the right bracket 22, a left wall 24B that extends downward from the left edge of the upper wall 24A and abuts against the left wall 22B of the right bracket 22, a right wall 24C that extends downward from the right edge of the upper wall 24A and abuts against the right wall 22C of the right bracket 22, and a bottom wall 24D that connects the lower end of the left wall 24B and the lower end of the right wall 24C.

[0086] The top wall 24A, left wall 24B, right wall 24C and bottom wall 24D abut against the outer periphery of the right bracket 22 in a manner surrounding the outer periphery of the right bracket 22 on the front side of the front sound-absorbing member 24, thereby constituting a cylindrical portion 24E. The cylindrical portion 24E of this embodiment constitutes a first cylindrical portion of the present invention.

[0087] That is, the right bracket 22 is surrounded by the front sound-absorbing member 24, and the vibrations thereof are suppressed by the contact, and the radiation of sound is also suppressed.

[0088] The cylindrical portion 24E into which the right bracket 22 is inserted is formed so that the inner dimension (opening width) on the front end portion 22a side of the right bracket 22 is smaller than the inner dimension (opening width) on the connecting portion 22F side (transfer device 14 side) of the right bracket 22.

[0089] As a result, the front sound absorbing member 24 is configured to be attachable to and detachable from the front end portion 22 a of the right bracket 22 attached to the transfer device 14 .

[0090] As shown in Figure 12, the front sound-absorbing member 24 has a rear bottom wall 24F extending rearward from the cylindrical portion 24E to extend the bottom wall 24D, a rear left wall 24G protruding upward from the left edge of the rear bottom wall 24F and extending rearward to extend the left wall 24B of the cylindrical portion 24E, and a rear right wall 24H protruding upward from the right edge of the rear bottom wall 24F and extending rearward to extend the right wall 24C of the cylindrical portion 24E.

[0091] The rear bottom wall 24F covers the underside of the right bracket 22, the rear left wall 24G abuts against the left wall 22B of the right bracket 22, and the rear right wall 24H abuts against the right wall 22C of the right bracket 22.

[0092] In other words, the rear bottom wall 24F, rear left wall 24G and rear right wall 24H abut against the outer periphery of the right bracket 22 excluding the top wall 22A, and the front sound-absorbing member 24 does not have an upper wall behind the cylindrical portion 24E, with the top wall 22A of the right bracket 22 being exposed between the rear left wall 24G and the rear right wall 24H (see Figure 8).

[0093] The heights of the rear left wall 24G and the rear right wall 24H are formed to be lower than the heights of the left wall 24B and the right wall 24C of the cylindrical portion 24E.

[0094] As shown in Figures 9 and 12, the front-to-rear lengths of the rear bottom wall 24F and the rear right wall 24H are formed to be the same length, and the front-to-rear length of the rear left wall 24G is formed to be longer than the front-to-rear lengths of the rear bottom wall 24F and the rear right wall 24H.

[0095] That is, rear left wall 24G extends so as to protrude further rearward than rear bottom wall 24F and rear right wall 24H. Therefore, the lower portion of rear left wall 24G is cut out by the height of rear bottom wall 24F, and the lower surface of rear left wall 24G is at approximately the same height as the upper surface of rear bottom wall 24F.

[0096] The width of the front sound-absorbing member 24 in the vehicle width direction is wider at the rear and narrower at the front side (on the cylindrical portion 24E side) than at the rear side, and the front end portion 22a of the right bracket 22, which has a narrower width in the vehicle width direction than the connecting portion 22F, is inserted into the front cylindrical portion 24E.

[0097] 12, a pair of engaging protrusions 24I are formed at the front end of the bottom wall 24D of the cylindrical portion 24E, and the engaging protrusions 24I protrude upward from the bottom wall 24D. In other words, the engaging protrusions 24I protrude from the bottom wall 24D toward the inside of the cylindrical portion 24E.

[0098] As shown in FIG. 13, a pair of grooves 22G are formed between the inclined rib 22D and the longitudinal rib 22E on the front end portion 22a side of the right bracket 22, and the engaging protrusion 24I engages with the grooves 22G (see FIG. 11).

[0099] More specifically, the pair of engaging protrusions 24I are fitted into the pair of grooves 22G, respectively, with the front-rear rib 22E sandwiched therebetween and the periphery thereof abutting against the right bracket 22 to engage therewith.

[0100] As a result, when the cylindrical portion 24E of the front sound-absorbing member 24 is attached to the right bracket 22, the engaging protrusion 24I gets caught in the groove portion 22G, preventing the front sound-absorbing member 24 from coming off the right bracket 22 and preventing the right bracket 22 from slipping out of the front sound-absorbing member 24.

[0101] In other words, the front sound-absorbing member 24 is skewered when the right bracket 22 is inserted into the cylindrical portion 24E, and the engaging protrusion 24I engages with the groove portion 22G, so that the front sound-absorbing member 24 is attached to the right bracket 22 in a state where it is prevented from coming off the right bracket 22.

[0102] This, combined with the effect of the shape of the cylindrical portion 24E, prevents the front sound absorbing member 24 from falling off the right bracket 22.

[0103] As shown in Figure 11, the engaging protrusion 24I protrudes forward from the front end of the tubular portion 24E, and by engaging the engaging protrusion 24I with the groove portion 22G in a compressed state, the contact pressure between the engaging protrusion 24I and the groove portion 22G is maintained high.

[0104] 8 and 9, a rear sound-absorbing member 25 made of an elastic material such as polyurethane rubber is attached to the right bracket 22 rearward of the connecting portion 22F, and the connecting portion 22F is located between the front sound-absorbing member 24 and the rear sound-absorbing member 25 in the front-to-rear direction. In this embodiment, the front sound-absorbing member 24 constitutes the first sound-absorbing member, and the rear sound-absorbing member 25 constitutes the second sound-absorbing member.

[0105] The rear sound-absorbing member 25 comprises an upper wall 25A that abuts against the upper wall 22A of the right bracket 22, a left wall 25B that extends downward from the left edge of the upper wall 25A and abuts against the left wall 22B of the right bracket 22, a right wall 25C that extends downward from the right edge of the upper wall 25A and abuts against the right wall 22C of the right bracket 22, and a bottom wall 25D that connects the lower end of the left wall 25B and the lower end of the right wall 25C.

[0106] The top wall 25A, the left wall 25B, the right wall 25C, and the bottom wall 25D abut against the outer periphery of the right bracket 22 so as to surround the outer periphery of the right bracket 22 on the rear side of the rear sound-absorbing member 25, and form a cylindrical portion 25E. The cylindrical portion 25E in this embodiment forms a third cylindrical portion.

[0107] That is, the right bracket 22 is surrounded by the rear sound-absorbing member 25, and the vibration thereof is suppressed by the contact, and the radiation of sound is also suppressed.

[0108] The cylindrical portion 25E into which the right bracket 22 is inserted is formed so that the inner dimension (opening width) on the rear end portion 22b side of the right bracket 22 is smaller than the inner dimension (opening width) on the connecting portion 22F side (transfer device 14 side) of the right bracket 22.

[0109] As a result, the rear sound absorbing member 25 is configured to be detachable from the rear end portion 22 b of the right bracket 22 attached to the transfer device 14 .

[0110] As shown in Figure 9, the rear sound-absorbing member 25 has a front bottom wall 25F extending forward from the bottom wall 25D of the cylindrical portion 25E, and a front right wall 25G protruding upward from the right edge of the front bottom wall 25F and extending forward so as to extend the right wall 25C of the cylindrical portion 25E.

[0111] The front bottom wall 25F and the front right wall 25G abut against the outer periphery of the right bracket 22, and the rear sound-absorbing member 25 does not have an upper wall or a left wall forward of the cylindrical portion 25E, and the upper wall 22A of the right bracket 22 is exposed to the left of the front right wall 25G.

[0112] In other words, as shown in Figures 10 and 11, the front ends of the front bottom wall 25F and the front right wall 25G reach the position of the connecting portion 22F of the right bracket 22, and together with the rear bottom wall 24F and the rear right wall 24H of the front sound-absorbing member 24, they cover the lower side and right side of the connecting portion 22F.

[0113] 9, a pair of engaging protrusions 25H are formed at the rear end of bottom wall 25D of cylindrical portion 25E, and engaging protrusions 25H protrude upward from bottom wall 25D. In other words, engaging protrusions 25H protrude from bottom wall 25D toward the inside of cylindrical portion 25E.

[0114] As shown in Figure 13, on the rear end 22b side of the right bracket 22, a pair of grooves 22H are formed between the rear end of the inclined rib 22D and the left wall 22B of the right bracket 22, and between the rear end of the inclined rib 22D and the right wall 22C of the right bracket 22, and the engaging protrusion 25H engages with the grooves 22H (see Figure 11).

[0115] As a result, when the cylindrical portion 25E of the rear sound-absorbing member 25 is attached to the right bracket 22, the engaging protrusion 25H gets caught in the groove portion 22H, so that the rear sound-absorbing member 25 is attached to the right bracket 22 in a state where it is prevented from coming off.

[0116] In other words, the rear sound-absorbing member 25 is skewered when the right bracket 22 is inserted into the cylindrical portion 25E, and the engaging protrusion 25H enters and engages with the groove portion 22H, so that the rear sound-absorbing member 25 is attached to the right bracket 22 in a state where it is prevented from coming off.

[0117] This, combined with the effect of the shape of the cylindrical portion 25E, prevents the rear sound absorbing member 25 from falling off the right bracket 22. The engaging protrusion 25H of this embodiment forms a second engaging portion.

[0118] As shown in Figure 11, the engaging protrusion 25H protrudes rearward from the rear end of the tubular portion 25E, and by engaging the engaging protrusion 25H with the groove portion 22H in a compressed state, the contact pressure between the engaging protrusion 25H and the groove portion 22H is maintained high.

[0119] As shown in FIG. 8, an in-vehicle component mounting portion 22I is provided on the rear end portion 22b side of the right bracket 22, and the in-vehicle component mounting portion 22I is provided behind the rear sound absorbing member 25.

[0120] For example, a fuel pipe clamp (not shown) or the like is attached to the vehicle-mounted part attachment portion 22I.

[0121] When the rear sound-absorbing member 25 tries to move rearward, the rear sound-absorbing member 25 comes into contact with an on-board component attached to the on-board component attachment portion 22I, thereby restricting the rearward movement of the rear sound-absorbing member 25 and preventing it from coming off by the on-board component.

[0122] As shown in FIGS. 8 and 9, a resin cover member 26 is attached to the right bracket 22 so as to cover the front sound absorbing member 24.

[0123] The cover member 26 comprises an upper wall 26A that abuts against the upper wall 24A of the front sound-absorbing member 24, a left wall 26B that extends downward from the left edge of the upper wall 26A and abuts against the left wall 24B of the front sound-absorbing member 24, a right wall 26C that extends downward from the right edge of the upper wall 26A and abuts against the right wall 24C of the front sound-absorbing member 24, and a bottom wall 26D (see Figure 3) that connects the lower end of the left wall 26B and the lower end of the right wall 26C.

[0124] The top wall 26A, left wall 26B, right wall 26C and bottom wall 26D abut against the outer periphery of the front sound-absorbing member 24 in a manner surrounding the outer periphery of the front sound-absorbing member 24 at the front portion of the cover member 26, and form a cylindrical portion 26E. In this embodiment, the cylindrical portion 26E forms a second cylindrical portion.

[0125] The cylindrical portion 26E of the cover member 26 covers the entire cylindrical portion 24E of the front sound-absorbing member 24, and the length of the cylindrical portion 26E in the front-to-rear direction is formed to be long enough to maintain its position and posture along the right bracket 22.

[0126] The cylindrical portion 26E into which the front sound-absorbing member 24 is inserted is formed so that the inner dimension (opening width) on the front end portion 22a side of the right bracket 22 is smaller than the inner dimension (opening width) on the connecting portion 22F side (transfer device 14 side) of the right bracket 22.

[0127] As a result, the cover member 26 is configured to be detachable from the front end portion 22 a of the right bracket 22 relative to the front sound absorbing member 24 attached to the right bracket 22 .

[0128] As shown in Figure 9, the cover member 26 has a rear bottom wall 26F that extends rearward from the cylindrical portion 26E and abuts against the rear bottom wall 24F of the front sound-absorbing member 24; a rear left wall 26G that protrudes upward from the left edge of the rear bottom wall 26F, extends rearward so as to extend the left wall 26B of the cylindrical portion 26E, and abuts against the rear left wall 24G of the front sound-absorbing member 24; and a rear right wall 26H that protrudes upward from the right edge of the rear bottom wall 26F, extends rearward so as to extend the right wall 26C of the cylindrical portion 26E, and abuts against the rear right wall 24H of the front sound-absorbing member 24.

[0129] The cover member 26 does not have an upper wall behind the cylindrical portion 26E, and the upper wall 22A of the right bracket 22 is exposed between the rear left wall 26G and the rear right wall 26H.

[0130] The heights of the rear left wall 26G and the rear right wall 26H are formed to be lower than the heights of the left wall 26B and the right wall 26C of the cylindrical portion 26E.

[0131] The rear bottom wall 26F, rear left wall 26G and rear right wall 26H have the same front-to-rear length, and the rear bottom wall 26F, rear left wall 26G and rear right wall 26H extend further rearward than the rear bottom wall 24F, rear left wall 24G and rear right wall 24H of the front sound-absorbing member 24.

[0132] As shown in FIG. 11, the rear end of the rear bottom wall 24F of the front sound absorbing member 24 and the front end of the front bottom wall 25F of the rear sound absorbing member 25 abut against each other so that their shapes are continuous.

[0133] The rear bottom wall 26F of the cover member 26 is positioned below the rear bottom wall 24F and the front bottom wall 25F of the rear sound absorbing member 25, so that the cover member 26 covers the gap between the rear bottom wall 24F and the front bottom wall 25F and supports the rear bottom wall 24F and the front bottom wall 25F from below.

[0134] 10, the rear end of the rear right wall 24H of the front sound-absorbing member 24 abuts against the front end of the front right wall 25G of the rear sound-absorbing member 25. That is, the rear end of the front sound-absorbing member 24 and the front end of the rear sound-absorbing member 25 abut against each other so that their shapes are continuous.

[0135] A vertical gap is formed between the rear left wall 24G and the rear bottom wall 26F of the cover member 26, and the front bottom wall 25F of the rear sound-absorbing member 25 is recessed below the rear left wall 24G of the front sound-absorbing member 24. In other words, the front bottom wall 25F of the rear sound-absorbing member 25 is disposed between the rear left wall 24G and the rear bottom wall 26F of the cover member 26.

[0136] The connecting portion 14C of the case 14A of the transfer device 14 protrudes above the cover member 26 and faces the cover member 26 in the vertical direction. The rear left wall 24G of the front sound-absorbing member 24 and the front bottom wall 25F of the rear sound-absorbing member 25 are positioned between the rear bottom wall 26F of the cover member 26 and the case 14A in the vertical direction to prevent them from falling off.

[0137] In other words, the rear left wall 24G of the front sound absorbing member 24, the front bottom wall 25F of the rear sound absorbing member 25, the rear bottom wall 26F of the cover member 26, and the case 14A are arranged in line in the vertical direction.

[0138] 8 and 10 , the rear right wall 26H of the cover member 26 covers the rear end of the rear right wall 24H of the front sound-absorbing member 24 and the front end of the front right wall 25G of the rear sound-absorbing member 25. In other words, the rear right wall 26H of the cover member 26 covers the contact point between the rear right wall 24H of the front sound-absorbing member 24 and the front right wall 25G of the rear sound-absorbing member 25.

[0139] Here, the front sound-absorbing member 24 has a U-shaped rear bottom wall 24F, rear left wall 24G and rear right wall 24H extending rearward from the cylindrical portion 24E below the connecting portion 22F of the right bracket 22, and there is a risk that the rear bottom wall 24F, rear left wall 24G and rear right wall 24H may sag downward.

[0140] However, by covering the rear bottom wall 24F, the rear left wall 24G and the rear right wall 24H from below with a cover member 26 that is more rigid than the front sound-absorbing member 24, the rear bottom wall 24F, the rear left wall 24G and the rear right wall 24H can be supported and prevented from sagging downward.

[0141] This prevents the front sound absorbing member 24 from falling off the right bracket 22 and from being deformed elastically, thereby preventing its durability from being reduced.

[0142] The posture of the cover member 26 is maintained by the cylindrical portion 26E, which is composed of the upper wall 26A, left wall 26B, right wall 26C and bottom wall 26D, abutting against the front sound-absorbing member 24 so as to surround the outer periphery of the front sound-absorbing member 24.

[0143] 10 and 11, a hole 26a is formed in the top wall 26A of the cover member 26. An engaging protrusion 24J is formed in the top wall 24A of the front sound-absorbing member 24, and the engaging protrusion 24J protrudes outward from the hole 26a. The hole 26a engages with the engaging protrusion 24J, thereby preventing the cover member 26 from coming off the front sound-absorbing member 24. In this embodiment, the hole 26a constitutes the engaging portion.

[0144] An inclined surface 24t is formed on the upper surface of the engaging protrusion 24J, and the inclined surface 24t is inclined upward so as to become higher from the front end portion on the front end portion 22a side of the right bracket 22 toward the rear end portion on the rear end portion 22b side of the right bracket 22. The engaging protrusion 24J in this embodiment constitutes a protrusion.

[0145] The cylindrical portion 26E is formed so that the inner dimension (opening width) on the front end portion 22a side of the right bracket 22 is smaller than the inner dimension (opening width) on the connecting portion 22F side (transfer device 14 side) of the right bracket 22, so that when the cover member 26 attempts to move rearward, it cannot move further rearward than the attached state in which it abuts against the front sound-absorbing member 24.

[0146] Furthermore, when the cover member 26 attempts to move toward the front end 22a of the right bracket 22 relative to the front sound-absorbing member 24, the hole 26a comes into contact with the highest rear end of the engaging protrusion 24J, thereby reliably preventing the cover member 26 from coming off the front sound-absorbing member 24. The engaging protrusion 24J in this embodiment constitutes a first engaging portion.

[0147] 10, a cutout hole 26b is formed in the lower part of the right wall 26C of the cover member 26. An engaging protrusion 24K that is long in the front-to-rear direction is formed in the right wall 24C of the front sound-absorbing member 24, and the engaging protrusion 24K is fitted into the cutout hole 26b.

[0148] This, together with the engagement at the first engagement portion, more effectively prevents the cover member 26 from coming off the front sound absorbing member 24.

[0149] As shown in Figure 11, the cylindrical portion 26E of the cover member 26 covers the engagement point between the engaging protrusion 24I of the front sound-absorbing member 24 and the groove portion 22G of the right bracket 22, and because the front sound-absorbing member 24 is surrounded by the cylindrical portion 26E, it is difficult for the engaging protrusion 24I to move out of the groove portion 22G, and the state in which the engaging protrusion 24I is engaged with the groove portion 22G is maintained.

[0150] Next, the operation of the sound absorbing structure of the transfer device 14 of this embodiment will be described. In this embodiment, before the left bracket 21 is mounted on the vehicle 1, the sound-absorbing member 23 is inserted into the left bracket 21 fixed to the transfer device 14 from the left end 21a, and the boss portion 21F is inserted into the hole 23a while the cylindrical portion 23G grips the left end 21a side of the left bracket 21.

[0151] When the boss portion 21F is inserted into the hole 23a, the boss portion 21F comes into contact with the thin plate portion 23E, causing the thin plate portion 23E to deform so as to open the slit 23s, thereby allowing the boss portion 21F to be easily inserted into the hole 23a.

[0152] In addition, the front-to-rear width of the left bracket 21 is narrower on the left side frame 2 side and wider on the transfer device 14 side than the left side frame 2 side, and the front-to-rear width of the sound-absorbing member 23 is narrower on the left side frame 2 side and wider on the transfer device 14 side than the left side frame 2 side.

[0153] Therefore, when the sound absorbing member 23 is attached to the left bracket 21, the sound absorbing member 23 can move along the left bracket 21 toward the left side frame 2, but cannot move toward the transfer device 14.

[0154] Furthermore, the sound-absorbing member 23 and the left side frame 2 are prevented from coming off the left bracket 21 by the boss portion 21F of the left bracket 21 engaging with the hole 23a in the upper wall 23A of the sound-absorbing member main body portion 23H, and the sound-absorbing member 23 cannot move toward the left side frame 2 relative to the left bracket 21.

[0155] Furthermore, if the vibration transmitted from the transfer device 14 to the left bracket 21 causes the sound-absorbing member 23 to come off the left bracket 21, it is conceivable that the sound-absorbing member 23 will rotate around the cylindrical portion 23G so that the hole 23a side (right side) is lifted upward, as shown in Figure 7.

[0156] At this time, boss portion 21F of left bracket 21 engages with hole 23a of sound absorbing member main body 23H, thereby preventing sound absorbing member 23 from moving upward and leftward.

[0157] In other words, the sound-absorbing member 23 is skewered when the left bracket 21 is inserted into the cylindrical portion 23G, and the boss portion 21F engages with the hole 23a, so that the sound-absorbing member 23 is attached to the left bracket 21 in a state where it is prevented from coming loose from the left bracket 21.

[0158] Furthermore, when the sound absorbing member 23 rotates around the cylindrical portion 23G so that the right side is lifted upward, the boss portion 21F of the left bracket 21 effectively engages with the hole 23a, preventing the sound absorbing member 23 from moving upward and to the left.

[0159] As a result, even if vibrations are applied to the left bracket 21 from the transfer device 14, the sound absorbing member 23 is prevented from coming off the left bracket 21, and the sound absorbing member 23 can be stably attached to the left bracket 21.

[0160] As a result, noise generated by vibrations transmitted from the transfer device 14 to the left bracket 21 can be absorbed by the sound absorbing member 23, and the noise generated by the transfer device 14 can be reduced.

[0161] On the other hand, the front sound-absorbing member 24 is skewered when the right bracket 22 is inserted into the cylindrical portion 24E, and the engaging protrusion 24I engages with the groove portion 22G, so that the front sound-absorbing member 24 is attached to the right bracket 22 in a state where it is prevented from coming off the right bracket 22.

[0162] In addition, the rear sound-absorbing member 25 is skewered when the right bracket 22 is inserted into the cylindrical portion 25E of the rear sound-absorbing member 25, and the engaging protrusion 25H engages with the groove portion 22H, so that the rear sound-absorbing member 25 is attached to the right bracket 22 in a state where it is prevented from coming off the right bracket 22.

[0163] Therefore, noise generated by vibrations transmitted from the transfer device 14 to the right bracket 22 can be absorbed by the front sound absorbing member 24 and the rear sound absorbing member 25, thereby reducing the noise generated by the transfer device 14.

[0164] As a result of the above, noise generated from the transfer device 14 can be reduced by the sound absorbing member 23, the front sound absorbing member 24, and the rear sound absorbing member 25, and the quietness of the vehicle 1 can be improved.

[0165] Incidentally, the right bracket 22 is disposed near the right side frame 3, which also extends in the longitudinal direction, and extends along the right side frame 3, so that in winter snow tends to accumulate on top of the right bracket 22. In addition, water splashed onto the right bracket 22 from below by the front wheel and other elements as the vehicle moves.

[0166] When the snow accumulated on the right bracket 22 melts, it turns into water, and when the water cools it freezes, so the front sound absorbing member 24 and the rear sound absorbing member 25 are exposed to a harsh environment.

[0167] Because water expands when it freezes, water that gets into the gap between the right bracket 22 and the front sound-absorbing member 24, the gap between the right bracket 22 and the rear sound-absorbing member 25, and the gap between the front sound-absorbing member 24 and the rear sound-absorbing member 25 becomes an obstacle for the front sound-absorbing member 24 and the rear sound-absorbing member 25, which are made of a relatively soft material.

[0168] According to the sound-absorbing structure of the transfer device 14 of this embodiment, a cover member 26 made of resin that is harder than the front sound-absorbing member 24 is attached to the front sound-absorbing member 24, and the rear right wall 26H of the cover member 26 covers the contact point between the rear right wall 24H of the front sound-absorbing member 24 and the front right wall 25G of the rear sound-absorbing member 25, and the rear bottom wall 26F of the cover member 26 covers the contact point between the rear bottom wall 24F of the front sound-absorbing member 24 and the front bottom wall 25F of the rear sound-absorbing member 25.

[0169] This prevents snow and water from entering and freezing into the gap between the right bracket 22 and the front sound-absorbing member 24, the gap between the right bracket 22 and the rear sound-absorbing member 25, and the gap between the rear bottom wall 24F and the front bottom wall 25F, thereby protecting the front sound-absorbing member 24 and the rear sound-absorbing member 25 from snow and ice.

[0170] In addition, since the cylindrical portion 24E of the front sound absorbing member 24 is covered by the cylindrical portion 26E of the cover member 26, the front sound absorbing member 24 can be protected from snow, flying stones, and the like from the front.

[0171] In addition, an engaging protrusion 24I is formed on the cylindrical portion 24E of the front sound-absorbing member 24, and when the engaging protrusion 24I is engaged with the groove portion 22G, it is elastically deformed, thereby maintaining a high contact pressure between the engaging protrusion 24J and the groove portion 22G.

[0172] In addition, an engaging protrusion 25H is formed on the cylindrical portion 25E of the rear sound-absorbing member 25, and when the engaging protrusion 25H is engaged with the groove portion 22H, it is elastically deformed, thereby maintaining a high contact pressure between the engaging protrusion 25H and the groove portion 22H.

[0173] This allows the engaging protrusions 24I, 25H to prevent snow from entering and freezing between the front sound-absorbing member 24 and the right bracket 22, and between the rear sound-absorbing member 25 and the right bracket 22, thereby protecting the front sound-absorbing member 24 and the rear sound-absorbing member 25 from snow.

[0174] On the other hand, since the exhaust pipe 42 is disposed below the left bracket 21, the heat of the exhaust pipe 42 melts snow adhering to the sound absorbing member 23 attached to the left bracket 21. Therefore, the sound absorbing member 23 is less likely to be damaged by freezing.

[0175] Furthermore, the sound absorbing member main body 23H of the sound absorbing member 23 and the exhaust pipe 42 face each other in the vertical direction, but the underside of the sound absorbing member main body 23H is open and the underside of the left bracket 21 is not covered by the sound absorbing member main body 23H, so that the sound absorbing member main body 23H is prevented from being affected by the heat of the exhaust pipe 42 and the sound absorbing member 23 can be protected from the exhaust heat.

[0176] Furthermore, since the left bracket 21 is exposed above the exhaust pipe 42, heat from the exhaust pipe 42 can be transferred to the metallic left bracket 21, making it possible to easily melt snow adhering to the left bracket 21.

[0177] In other words, the sound absorbing member 23 is formed in a shape that can easily melt snow adhering to the left bracket 21 while preventing direct exposure to the heat of the exhaust pipe 42.

[0178] Next, the effect of the sound absorbing structure of the transfer device 14 of this embodiment will be described. According to the sound absorbing structure of the transfer device 14 of this embodiment, the front sound absorbing member 24 has a cylindrical portion 24E into which the right bracket 22 is inserted and an engaging protrusion 24I that engages with the right bracket 22.

[0179] As a result, the front sound absorbing member 24 can be easily attached to the right bracket 22 by inserting the right bracket 22 into the cylindrical portion 24E and engaging the engaging protrusion 24I with the right bracket 22.

[0180] Therefore, the number of steps required to attach the front sound absorbing member 24 to the right bracket 22 can be reduced, and the workability of the attachment work of the front sound absorbing member 24 can be improved.

[0181] In addition, by covering the outer periphery of the right bracket 22 with the cylindrical portion 24E of the front sound-absorbing member 24, the sound insulation performance of the transfer device 14 can be improved, and the quietness of the vehicle 1 can be improved.

[0182] In addition, the sound-absorbing structure of the transfer device 14 has a cover member 26 arranged on the front sound-absorbing member 24, and the cover member 26 has a cylindrical portion 26E that covers the outer periphery of the cylindrical portion 24E, and the cylindrical portion 26E presses the engaging protrusion 24I against the right bracket 22.

[0183] This allows the cover member 26 to protect the front sound-absorbing member 24. In addition, the engaging protrusion 24I can be tightly engaged with the right bracket 22, reliably preventing the front sound-absorbing member 24 from slipping out of the right bracket 22. As a result, the reliability of the sound-insulating performance of the transfer device 14 can be prevented from decreasing.

[0184] Furthermore, according to the sound absorbing structure of the transfer device 14 of this embodiment, the upper wall 24A of the front sound absorbing member 24 is formed with an engaging protrusion 24J that protrudes outward from the upper wall 24A.

[0185] In addition, a hole 26a is formed in the cover member 26, and the engaging protrusion 24J is engaged with the hole 26a by fitting into the hole 26a.

[0186] This prevents the cover member 26 from slipping out of the front sound-absorbing member 24, and the cover member 26 can reliably protect the front sound-absorbing member 24.

[0187] Furthermore, the elastic force of the front sound absorbing member 24 is utilized to form the engaging protrusion 24J, which can be firmly engaged with the hole 26a of the cover member 26.

[0188] This eliminates the need for elasticity in the cover member 26, allowing the cover member 26 to have a high hardness and to use a sturdy cover member 26. As a result, the cover member 26 can protect the front sound-absorbing member 24 more effectively.

[0189] The sound absorbing structure of the transfer device 14 of this embodiment is provided with a rear sound absorbing member 25 that is provided separately from the front sound absorbing member 24 and has a cylindrical portion 25E into which the right bracket 22 is inserted.

[0190] In the direction in which the right bracket 22 extends, the rear end of the front sound-absorbing member 24 and the front end of the rear sound-absorbing member 25 abut against each other, and the cover member 26 has a rear bottom wall 26F, a rear left wall 26G, and a rear right wall 26H that cover the abutment points between the rear end of the front sound-absorbing member 24 and the front end of the rear sound-absorbing member 25.

[0191] The rear bottom wall 26F of the cover member 26 is positioned below the rear bottom wall 24F and the front bottom wall 25F of the rear sound-absorbing member 25, and the cover member 26 covers the gap between the rear bottom wall 24F and the front bottom wall 25F and supports the rear bottom wall 24F and the front bottom wall 25F from below.

[0192] The rear right wall 26H of the cover member 26 is positioned to the right of the rear right wall 24H of the front sound-absorbing member 24 and the front right wall 25G of the rear sound-absorbing member 25, so that the cover member 26 covers the gap between the rear right wall 24H and the front right wall 25G and prevents the rear right wall 24H and the front right wall 25G from moving away from the right wall 22C of the right bracket 22.

[0193] The rear left wall 26G of the cover member 26 is positioned to the left of the rear left wall 24G of the front sound-absorbing member 24 and the left wall 25B of the rear sound-absorbing member 25, so that the cover member 26 covers the gap between the rear left wall 24G and the left wall 25B and prevents the rear left wall 24G and the left wall 25B from moving away from the left wall 22B of the right bracket 22.

[0194] This allows the cover member 26 to prevent sound from leaking from the front sound absorbing member 24 and the rear sound absorbing member 25, thereby more effectively improving the sound insulation performance of the transfer device 14.

[0195] Furthermore, rear bottom wall 26F, rear left wall 26G, and rear right wall 26H can prevent snow, debris, and the like from entering the gap between front sound-absorbing member 24 and right bracket 22, the gap between rear sound-absorbing member 25 and right bracket 22, and the gap between front sound-absorbing member 24 and rear sound-absorbing member 25. This can prevent damage to front sound-absorbing member 24 and rear sound-absorbing member 25 due to freezing.

[0196] Furthermore, according to the sound-absorbing structure of the transfer device 14 of this embodiment, the cylindrical portion 25E of the rear sound-absorbing member 25 has an engaging protrusion 25H that engages with the right bracket 22. Therefore, the rear sound-absorbing member 25 can be easily attached to the right bracket 22 by inserting the right bracket 22 into the cylindrical portion 25E and engaging the engaging protrusion 25H with the right bracket 22.

[0197] Therefore, the number of steps required to attach the rear sound-absorbing member 25 to the right bracket 22 can be reduced, and the workability of the attachment work of the rear sound-absorbing member 25 can be improved.

[0198] Furthermore, by engaging the engaging protrusion 25H with the right bracket 22, it is possible to reliably prevent the rear sound-absorbing member 25 from coming off the right bracket 22. This makes it possible to prevent a decrease in the reliability of the sound-absorbing performance.

[0199] Furthermore, according to the sound-absorbing structure of the transfer device 14 of this embodiment, the connecting portion 14C of the case 14A of the transfer device 14 protrudes above the cover member 26 and faces the cover member 26 in the vertical direction, and the rear left wall 24G of the front sound-absorbing member 24 and the front bottom wall 25F of the rear sound-absorbing member 25 are positioned between the rear bottom wall 26F of the cover member 26 and the case 14A in the vertical direction.

[0200] This allows the front sound-absorbing member 24 and the rear sound-absorbing member 25 to be sandwiched between the case 14A and the cover member 26 from above and below, preventing the front sound-absorbing member 24 and the rear sound-absorbing member 25 from falling off the right bracket 22.

[0201] Furthermore, the rear left wall 24G of the front sound-absorbing member 24 and the front bottom wall 25F of the rear sound-absorbing member 25 are disposed vertically between the rear bottom wall 26F of the cover member 26 and the case 14A, so the front sound-absorbing member 24 and the rear sound-absorbing member 25 can be disposed closer to the transfer device 14. This allows the arrangement space for the front sound-absorbing member 24 and the rear sound-absorbing member 25 to be reduced.

[0202] Although the vehicle drive system of this embodiment is composed of a transfer device 14, it is not limited to the transfer device 14, and the vehicle drive system may be applied to the engine 11 or the transmission 12, and is not limited to the engine 11 or the transmission 12.

[0203] While an embodiment of the present invention has been disclosed, it will be apparent to one skilled in the art that modifications may be made thereto without departing from the scope of the present invention, and it is intended that all such modifications and equivalents be included in the following claims. [Explanation of symbols]

[0204] 2...left side frame (vehicle body), 3...right side frame (vehicle body), 6...center cross member (vehicle body), 14...transfer device (vehicle drive device), 22...right bracket (bracket), 24...front sound absorbing member (sound absorbing member, first sound absorbing member), 24E...cylindrical portion (first cylindrical portion), 24I...engaging convex portion (first engaging portion), 24J...engaging convex portion (protruding portion), 25...rear sound absorbing member (sound absorbing member, second sound absorbing member), 25H...engaging convex portion (second engaging portion), 26...cover member, 26a...hole, 26E...cylindrical portion (second cylindrical portion)

Claims

1. A sound absorbing structure for a vehicle drive device in which a sound absorbing member is attached to a bracket that attaches the vehicle drive device to a vehicle body, the sound-absorbing member includes a first sound-absorbing member having a first cylindrical portion into which the bracket is inserted and a first engaging portion that engages with the bracket, and a second sound-absorbing member that is provided separately from the first sound-absorbing member and has a third cylindrical portion into which the bracket is inserted, one end of the first sound-absorbing member and one end of the second sound-absorbing member are in contact with each other in the extending direction of the bracket, a cover member is disposed on the sound absorbing member, The cover member has a second cylindrical portion that covers the outer periphery of the first cylindrical portion, and the second cylindrical portion presses the first engagement portion against the bracket and covers the contact point between the first sound-absorbing member and the second sound-absorbing member.

2. A sound-absorbing structure for a vehicle drive unit in which a sound-absorbing member is attached to a bracket that attaches the vehicle drive unit to a vehicle body, the sound absorbing member includes a first sound absorbing member having a first cylindrical portion into which the bracket is inserted and a first engaging portion that engages with the bracket, a protrusion that protrudes outward from the outer periphery of the first sound-absorbing member is formed on the outer periphery of the first sound-absorbing member, a cover member is disposed on the sound absorbing member, A hole is formed in the cover member, the cover member has a second cylindrical portion that covers an outer periphery of the first cylindrical portion, and the second cylindrical portion presses the first engaging portion against the bracket; A sound absorbing structure for a vehicle drive unit, characterized in that the protrusion is fitted into the hole, thereby engaging with the hole.

3. the sound absorbing member includes a second sound absorbing member provided separately from the first sound absorbing member and having a third cylindrical portion into which the bracket is inserted; one end of the first sound-absorbing member and one end of the second sound-absorbing member are in contact with each other in the extending direction of the bracket, 3. The sound absorbing structure for a vehicle drive device according to claim 2, wherein the cover member covers a contact point between the first sound absorbing member and the second sound absorbing member.

4. 4. The sound absorbing structure for a vehicle drive device according to claim 1, wherein the third cylindrical portion has a second engaging portion that engages with the bracket.

5. the vehicle drive device has a case, the case faces the cover member in the up-down direction, 5. The sound-absorbing structure for a vehicle drive unit according to claim 4, wherein a portion of the first sound-absorbing member and a portion of the second sound-absorbing member are arranged between the cover member and the case in the vertical direction.

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