JP5835988B2 - Exhaust device support structure - Google Patents

Description

  The present invention relates to a support structure for an exhaust device.

  As a conventional support structure for an exhaust device, the exhaust device is formed by fixing an exhaust pipe of an exhaust device and a cylindrical nut having a female screw portion therein by a pair of halves. What is supported is known (see, for example, Patent Document 1).

Japanese Utility Model Publication No. 3-118219

  By the way, in the support structure described in Patent Document 1, the upper ends of the pair of halves and the lower half of the outer peripheral surface of the nut are fixed by fillet welding, and the rubber bush is fixed by a bolt screwed to the nut. However, since the rubber bush is offset and the upper ends of the pair of halves are formed in a tapered shape, the stress acting on the welded portion may increase. Therefore, in the support structure described in Patent Document 1, the half halves formed in a U-shape are joined to each other to form a box shape, and then the upper ends of the pair of halves are welded to the nut in a square shape. This increases the welding length and increases the joint strength. However, in such a countermeasure structure, the number of parts increases, welding work increases, and the number of work steps increases. Therefore, a simple structure is desired while ensuring support strength.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a support structure for an exhaust device that can secure support strength and can reduce the number of parts and the number of work steps. It is in.

In order to achieve the above object, an invention according to claim 1 includes an exhaust device that exhausts exhaust gas of an internal combustion engine of a vehicle to the outside, and a support member that is provided in the exhaust device and attaches the exhaust device to the vehicle side. In the support structure of the exhaust device provided, the support member surrounds along the outer half surface that is spaced apart from the exhaust device, among the cylindrical portion that is inserted into the interior and the fastening portion is fixed to the vehicle, and the outer peripheral surface of the cylindrical portion And a connecting member connected to the exhaust device on the inner half surface facing directly to the exhaust device, and a gap is provided between the cylindrical portion and the exhaust device. inner half parts is characterized Rukoto set a gap so as to make a shape that is open on the side facing the exhaust system.

  In the invention according to claim 2, in addition to the configuration according to claim 1, the connecting member is constituted by a single part, and the intermediate portion of the connecting member surrounds the cylindrical portion and is in close contact with the cylindrical portion. It is fixed to the cylindrical portion, and both end portions of the connecting member are respectively fixed to the exhaust device.

  The invention according to claim 3 is characterized in that, in addition to the configuration according to claim 2, the contact area between the connecting member and the cylindrical portion is set to be not less than half of the outer peripheral length of the cylindrical portion.

  The invention according to claim 4 is characterized in that, in addition to the structure according to claim 2 or 3, the end portion of the connecting member is formed wider than the intermediate portion of the connecting member.

  According to a fifth aspect of the present invention, in addition to the configuration according to any one of the first to fourth aspects, the end of the connecting member is bent along the longitudinal direction of the exhaust device, and the outer peripheral surface of the exhaust device Is formed in a circular arc shape when viewed in cross section.

In the invention according to claim 6 , in addition to the structure according to any one of claims 1 to 5 , the cylindrical portion is formed in an oval shape, and the fixing position of the connecting member and the cylindrical portion is the position of the cylindrical portion. It arrange | positions on a circular arc surface, It is characterized by the above-mentioned.
The invention according to claim 7 is characterized in that, in addition to the configuration according to claim 6, the fixing positions of the connecting member and the cylindrical portion are welded and combined at a plurality of locations on the arc surface.

The invention according to an eighth aspect is characterized in that, in addition to the configuration according to any one of the first to fifth aspects, a ground attachment portion is integrally formed with the connecting member.
The invention according to claim 9 is characterized in that, in addition to the configuration according to claim 6 or 7, a ground attachment portion is formed integrally with the connecting member.
According to a tenth aspect of the present invention, in addition to the configuration according to the ninth aspect, the ground attachment portion is integrally formed to bend from the straight portion corresponding to the straight portion of the oval cylindrical portion of the connecting member. It is characterized by that.

According to the first aspect of the present invention, the support member is disposed along the outer half surface that is spaced apart from the exhaust device among the cylindrical portion that is inserted into the interior of the fastening member and fixed to the vehicle side, and the outer peripheral surface of the cylindrical portion. And a connecting member connected to the exhaust device on the inner half surface facing the exhaust device, so as to suppress stress concentration in the welded portion as in the past and ensure support strength can do. In addition, since the structure is simple, the number of parts and the number of work steps can be reduced. In addition, since the gap is provided between the cylindrical portion and the exhaust device, the heat transmitted from the exhaust device can be suppressed and the thermal effect can be suppressed.

  According to the invention of claim 2, the connecting member is constituted by a single part, and the intermediate part of the connecting member is fixed to the cylindrical part in a state of surrounding the cylindrical part and being in close contact with the cylindrical part, and both ends of the connecting member. Since the portions are respectively fixed to the exhaust device, the stress acting on the connecting member can be evenly distributed, and the support strength can be increased.

  According to the invention of claim 3, since the contact range between the connecting member and the cylindrical portion is set to be more than half of the outer peripheral length of the cylindrical portion, the connecting member is caulked and fixed to the cylindrical portion, thereby supporting strength. Can be increased.

  According to invention of Claim 4, since the edge part of a connection member is formed more widely than the intermediate part of a connection member, the welding length to an exhaust apparatus can be earned and support strength can be raised. .

  According to the invention of claim 5, since the end of the connecting member is bent along the longitudinal direction of the exhaust device and is formed in an arc shape in cross section along the outer peripheral surface of the exhaust device, the connecting member is 3 It can be bent dimensionally to increase the rigidity of the connecting member.

According to the sixth aspect of the present invention, the cylindrical portion is formed in an oval shape, and the fixing position between the connecting member and the cylindrical portion is lower than the linear surface of the cylindrical portion. Since it arrange | positions on top, the adhesion degree of a connection member and a cylindrical part can be raised by adhering, and support strength can be raised by the integration effect.

According to invention of Claim 8 and 9 , since a ground attachment part is integrally formed in a connection member, parts can be shared and a number of parts can be reduced.

1 is a left side view illustrating a motorcycle on which an embodiment of a support structure for an exhaust device according to the present invention is mounted. FIG. 2 is a left side view around the internal combustion engine shown in FIG. 1. FIG. 2 is a right side view of the periphery of the internal combustion engine shown in FIG. 1. FIG. 3 is a left side view of the exhaust pipe shown in FIG. 2. It is a top view of the exhaust pipe shown in FIG. It is a left view of the supporting member shown in FIG. FIG. 7 is a top view of the support member shown in FIG. 6. It is a front view of the supporting member shown in FIG. It is the figure which looked at the supporting member shown in FIG. 6 from the arrow A direction. It is a left view corresponding to FIG. 6 explaining the modification of the support structure of the exhaust apparatus which concerns on this invention.

  Hereinafter, an embodiment of a support structure for an exhaust device according to the present invention will be described in detail with reference to the drawings. It should be noted that the drawings are viewed in the direction of the reference numerals, and in the following description, front, rear, left and right, and top and bottom are in accordance with the direction seen from the operator, and the front of the vehicle is Fr, rear is Rr, left is L, right is R, upper is shown as U, and lower is shown as D.

  As shown in FIGS. 1 and 2, the motorcycle 10 of the present embodiment includes a body frame 11 having a head pipe 12 provided at a front end, a pair of left and right main frames 13 extending rearward and downward from the head pipe 12, and A pair of left and right down frames 14 extending downward from the front lower surface of the pair of left and right main frames 13, a pair of left and right pivot plates 15 connected to the rear ends of the pair of left and right main frames 13, and a pair of left and right pivots A pair of left and right seat frames 16 connected to the upper part of the plate 15 and extending rearward and upward, the internal combustion engine 50 is attached to the main frame 13, the down frame 14, and the pivot plate 15.

  The motorcycle 10 includes a front fork 21 that is supported by the head pipe 12 so as to be steerable, a front wheel WF that is rotatably supported by the lower end portion of the front fork 21, and a steering wheel attached to the upper end portion of the front fork 21. Handle 22, a swing arm 23 that is swingably supported by the pivot plate 15, a rear wheel WR that is rotatably supported at the rear end of the swing arm 23, and a storage box 24 that is mounted on the main frame 13. And a fuel tank 25 attached on the seat frame 16 and a seat 26 attached on the fuel tank 25.

  In FIG. 1, reference numeral 31 is a front cowl, 32 is a front side cowl, 33 is a seat cowl, 34 is a rear cowl, 35 is a headlight, 36 is a side mirror, 37 is a front fender, 38 is a pillion step. It is.

  As shown in FIGS. 2 and 3, the internal combustion engine 50 includes a crankcase 51, a cylinder block 52 attached to an upper front portion of the crankcase 51, a cylinder head 53 attached to an upper end portion of the cylinder block 52, and a cylinder head A cylinder head cover 54 attached to the upper end portion of the crankcase 51, a generator cover 55 attached to the left side surface of the crankcase 51, and a clutch cover 56 attached to the right side surface of the crankcase 51. An exhaust device 70 that exhausts exhaust gas of the internal combustion engine 50 to the outside is connected to an exhaust port (not shown) of the cylinder head 53.

  As shown in FIGS. 2 to 5, the exhaust device 70 includes an exhaust pipe 71 connected to an exhaust port (not shown) of the cylinder head 53 and a muffler 72 connected to the downstream end of the exhaust pipe 71. The exhaust pipe 71 is attached to the bracket 15a by fastening a support member 80 provided at an intermediate portion thereof to a bracket 15a formed at the lower end portion of the pivot plate 15 with a fastening bolt (fastening member) 61 ( (See FIG. 3).

  As shown in FIGS. 6 to 9, the support member 80 includes an oval cylindrical portion 81 into which the fastening bolt 61 is inserted and fixed to the bracket 15 a of the pivot plate 15, and an outer peripheral surface of the cylindrical portion 81. The connecting member 82 is integrally formed so as to surround the outer half surface 81 a that is separated from the exhaust pipe 71 and is connected to the exhaust pipe 71 on the inner half surface 81 b side facing the exhaust pipe 71. As shown in FIG. 4, a rubber mount 62 is fitted in the cylindrical portion 81, and the fastening bolt 61 is inserted into an oval bolt insertion hole 62 a formed in the mount 62. ing.

  The connecting member 82 is composed of a single part, and surrounds the cylindrical portion 81 and is fixed to the cylindrical portion 81 by welding while being in close contact with the cylindrical portion 81, and from the front end of the intermediate portion 83. A front leg 84 that extends downward and is fixed to the exhaust pipe 71 by welding; and a rear leg 85 that extends downward from the rear end of the intermediate part 83 and is fixed to the exhaust pipe 71 by welding. Further, the contact range between the intermediate portion 83 of the connecting member 82 and the cylindrical portion 81 is set to be equal to or more than half of the outer peripheral length of the cylindrical portion 81. Further, in the present embodiment, a gap S is provided between the cylindrical portion 81 and the exhaust pipe 71 by the front and rear leg portions 84 and 85.

  Further, the fixing positions of the intermediate portion 83 and the cylindrical portion 81 of the connecting member 82 are respectively arranged on the front and rear arc surfaces of the cylindrical portion 81, and there are portions of the intermediate portion 83 corresponding to the front and rear fixing positions. A long hole 83a for welding the cylindrical portion 81 and the connecting member 82 is formed.

  Further, the rear leg portion 85 of the connecting member 82 is formed wider than the intermediate portion 83 of the connecting member 82. Further, the rear leg portion 85 is bent rearward along the longitudinal direction of the exhaust pipe 71 and is formed in an arc shape in cross section along the outer peripheral surface of the exhaust pipe 71.

  Further, on the upper surface of the intermediate portion 83 of the connecting member 82, a ground attachment portion 86 for connecting a ground wiring (not shown) is integrally projected upward.

  As described above, according to the support structure of the exhaust device 70 of the present embodiment, the support member 80 includes the cylindrical portion 81 in which the fastening bolt 61 is inserted and fixed to the vehicle 10 side, and the cylindrical portion 81. Of the outer peripheral surface, a connecting member 82 that is integrally formed so as to surround the outer half surface 81a that is separated from the exhaust pipe 71 and that is connected to the exhaust pipe 71 on the inner half surface 81b side facing the exhaust pipe 71; Therefore, it is possible to suppress the stress concentration in the welded portion as in the conventional case and to secure the support strength. In addition, since the structure is simple, the number of parts and the number of work steps can be reduced.

  Further, according to the support structure of the exhaust device 70 of the present embodiment, the connecting member 82 is configured by a single component, and the intermediate portion 83 of the connecting member 82 surrounds the cylindrical portion 81 and is in close contact with the cylindrical portion 81. Since the front and rear legs 84 and 85 of the connecting member 82 are fixed to the exhaust pipe 71, the stress acting on the connecting member 82 can be evenly distributed. Support strength can be increased.

  Further, according to the support structure of the exhaust device 70 of the present embodiment, the contact range between the connecting member 82 and the cylindrical portion 81 is set to be half or more of the outer peripheral length of the cylindrical portion 81, so The supporting strength can be increased by dispersing the stress to be applied.

  Further, according to the support structure of the exhaust device 70 of the present embodiment, the rear leg portion 85 of the connecting member 82 is formed wider than the intermediate portion 83 of the connecting member 82, so that the welding length to the exhaust pipe 71 is increased. Can increase the support strength.

  Further, according to the support structure of the exhaust device 70 of the present embodiment, the rear leg 85 of the connecting member 82 is bent along the longitudinal direction of the exhaust pipe 71 and is cross-sectional along the outer peripheral surface of the exhaust pipe 71. Since the connection member 82 is formed in a circular arc shape, the connection member 82 can be bent three-dimensionally to increase the rigidity of the connection member 82.

  Further, according to the support structure of the exhaust device 70 of the present embodiment, since the gap S is provided between the cylindrical portion 81 and the exhaust pipe 71, the heat transmitted from the exhaust pipe 71 is suppressed to the support member 80. The thermal effect of can be suppressed.

  Further, according to the support structure of the exhaust device 70 of the present embodiment, the cylindrical portion 81 is formed in an oval shape, and the fixing position of the connecting member 82 and the cylindrical portion 81 is compared with the linear surface of the cylindrical portion 81. Therefore, the adhesion between the connecting member 82 and the cylindrical portion 81 can be increased by fixing, and the support strength can be increased due to the integration effect.

  Further, according to the support structure of the exhaust device 70 of the present embodiment, since the ground attachment portion 86 is integrally formed with the connecting member 82, the parts can be shared and the number of parts can be reduced.

  As a modification of the present embodiment, as shown in FIG. 10, the connecting member 82 is fixed to the cylindrical portion 81 by caulking the front and rear legs 84 and 85 to the inner half surface 81 b of the cylindrical portion 81. May be. In this case, welding is not necessary, but welding may be performed according to caulking.

  In the present modification, the front and rear legs 84 and 85 wrap around to the lower side of the inner half surface 81b of the cylindrical portion 81 by caulking, so that the contact range between the connecting member 82 and the cylindrical portion 81 is greater than that of the above embodiment. Become wider. As a result, the stress acting on the connecting member 82 can be further dispersed to further increase the support strength.

  In addition, this invention is not limited to what was illustrated to the said embodiment, In the range which does not deviate from the summary of this invention, it can change suitably.

10 Motorcycle 50 Internal combustion engine 61 Fastening bolt (fastening member)
62 Mount 70 Exhaust device 71 Exhaust pipe 72 Muffler 80 Support member 81 Cylindrical portion 81a Outer half surface 81b Inner half surface 82 Connecting member 83 Intermediate portion 84 Front leg portion (end portion)
85 Rear leg (end)
86 Grounding part S Clearance

Claims (10)

An exhaust device (70) for exhausting the exhaust gas of the internal combustion engine (50) of the vehicle (10) to the outside;
A support member (80) provided on the exhaust device and provided with a support member (80) for attaching the exhaust device to a vehicle side;
The support member is
A cylindrical part (81), through which a fastening member (61) is inserted and fixed to the vehicle side;
Of the outer peripheral surface of the cylindrical portion, the exhaust device is integrally formed so as to surround the outer half surface (81a) that is separated from the exhaust device, and on the inner half surface (81b) side that directly faces the exhaust device. A coupling member (82) coupled to
A gap (S) is provided between the cylindrical portion (81) and the exhaust device (70),
The gap (S) is set in the connecting member (82) so that the inner half surface (81b) of the cylindrical portion (81) is opened on the side facing the exhaust device (70). A structure for supporting an exhaust device. The connecting member (82) is composed of a single part,
An intermediate part (83) of the connecting member is fixed to the cylindrical part in a state of surrounding the cylindrical part (81) and being in close contact with the cylindrical part,
The exhaust device support structure according to claim 1, wherein both end portions (84, 85) of the connecting member are fixed to the exhaust device (70), respectively.   The support structure for an exhaust device according to claim 2, wherein a close contact range between the connecting member (82) and the cylindrical portion (81) is set to a half or more of an outer peripheral length of the cylindrical portion.   The support structure for an exhaust device according to claim 2 or 3, wherein an end portion (85) of the connecting member (82) is formed wider than an intermediate portion (83) of the connecting member.   An end (85) of the connecting member (82) is bent along the longitudinal direction of the exhaust device (70) and is formed in an arc shape in cross section along the outer peripheral surface of the exhaust device. The support structure for an exhaust device according to any one of claims 1 to 4. The cylindrical portion (81) is formed in an oval shape,
The exhaust structure support structure according to any one of claims 1 to 5 , wherein a fixing position between the connecting member (82) and the cylindrical portion is disposed on an arc surface of the cylindrical portion. . The support structure for an exhaust device according to claim 6, wherein the fixing position of the connecting member (82) to the cylindrical portion is welded at a plurality of locations on the arc surface. The exhaust structure support structure according to any one of claims 1 to 5 , wherein a ground attachment portion (86) is formed integrally with the connecting member (82). The support structure for an exhaust device according to claim 6 or 7, wherein a ground mounting portion (86) is formed integrally with the connecting member (82). The grounding portion (86) is formed by bending and extending integrally from a straight line portion corresponding to a straight line portion of the elliptical cylindrical portion of the connecting member (82). The support structure of the exhaust apparatus described in 1.

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