JP5548729B2 - Support device for exhaust parts - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a support device for exhaust parts such as an exhaust pipe and a silencer disposed under the floor of a vehicle such as an automobile, and more particularly to improve the support rigidity in the vehicle width direction of the exhaust parts to improve the steering feeling of the vehicle. The present invention relates to a support device for exhaust parts.

  2. Description of the Related Art Conventionally, in a support device for exhaust parts such as an exhaust pipe and a silencer disposed under a vehicle floor, one point of a front pipe (exhaust part) 2a and two points of a muffler (exhaust part) 3 are mounted rubber (rubber elastic body). ) Support balance and support rigidity so that the center of gravity of the exhaust system combining the front pipe 2a and the muffler 3 is located in the triangle drawn by connecting these three support points and supporting the vehicle body side via 10 2. Description of the Related Art An exhaust part support device that improves the above and reduces the number of support parts is known (see Patent Document 1 below).

Japanese Utility Model Publication No. 63-32325

  However, the exhaust device support device disclosed in Patent Document 1 is disposed so that the support point surrounds the center of gravity of the exhaust system, and each support device suppresses movement (swing) in the vehicle width direction (left-right direction). Since no technical countermeasures have been taken, the support rigidity (holding force) is weak against movement of the exhaust parts in the vehicle width direction. For example, when the vehicle travels on a curve, the vehicle body is outside due to centrifugal force. However, at this time, the exhaust parts of the front pipe 2a and the muffler 3 constituting the exhaust system do not move together with the vehicle body but move to the outside without delay, and the vehicle shifts from the curve running to the straight running so that the vehicle When returning to the original posture, these exhaust parts return to their original positions with a delay, so that there is a problem that the movement of the exhaust parts is transmitted to the vehicle body with a delay of the movement of the vehicle body, and the steering feeling is deteriorated.

  In view of such a problem, the present invention has a high support rigidity in the vehicle width direction with respect to the exhaust part, and the movement of the exhaust part is suppressed from being transmitted to the vehicle body after the movement of the vehicle body, thereby improving the steering feeling. It is an object of the present invention to provide a novel exhaust component support device that solves the above-described problems.

In order to solve the above-mentioned problem, an invention according to claim 1 is directed to an exhaust component that elastically supports a silencer, which is one of a plurality of exhaust components, under an underbody floor via an elastic body. A support device,
The elastic body is a center of gravity line of the vehicle width direction through the center of gravity of the muffler, and supports the digestion sound device, a first attachment portion is a vehicle body-side support member is only mounted, the muffler supporting member is only attached Elasticity that compresses and expands between the first attachment portion and the second attachment portion when a load in the vehicle width direction acts on the silencer while connecting the second attachment portion, the first attachment portion, and the second attachment portion. A support portion,
The vehicle body side support member and the muffler side support member extend in the front-rear direction of the vehicle body, and are respectively inserted into the first attachment hole and the second attachment hole provided in the first attachment portion and the second attachment portion. And
The vehicle body side support member and the silencer side support member are arranged in parallel in the vehicle width direction on a center line of the vehicle width direction passing through the center of gravity of the silencer .

  In the first aspect of the present invention, “the elastic body supports the muffler on the center line in the vehicle width direction passing through the center of gravity of the muffler” refers to a first embodiment described later. As described above, the elastic body supports the silencer at a position slightly deviated in the front-rear direction from the center of gravity line. The term “on the center line” includes “substantially on the center line”.

In order to solve the above-mentioned problems, the invention described in claim 2 is the one described in claim 1, wherein the silencer includes a shell that is long in the vehicle width direction and end walls that close both left and right ends. The exhaust pipe is connected to one end wall, and the silencer side support member having a bracket protruding in the vehicle width direction is fixed to the other end wall, and the tip of the silencer side support member is It is characterized by extending from the bracket toward the rear of the vehicle body.

In order to solve the above-mentioned problem, the invention described in claim 3 is the one described in claim 1 or 2, wherein the first mounting hole is separated from the second mounting hole in the vertical direction of the vehicle body. The elastic support portion is provided to extend in a direction inclined with respect to the vehicle width direction between the first mounting hole and the second mounting hole.

  According to the first aspect of the present invention, the elastic body that supports the silencer that is one of the exhaust parts includes the elastic support portion that compresses and expands when a load in the vehicle width direction acts on the silencer. Because of the high spring constant in the vehicle width direction, the support rigidity in the vehicle width direction for the silencer is high, and the silencer is supported on the center line of the vehicle width direction passing through the center of gravity of the silencer. The support rigidity in the direction can be further increased. And since the silencer is a heavy part among the exhaust parts, the support rigidity in the vehicle width direction of the silencer is improved, and as a result, the movement of the exhaust part is delayed and is prevented from being transmitted to the vehicle body. The improvement effect of steering feeling is extremely high.

According to the invention described in claim 3, since the input in the vehicle width direction acts not only in the shearing direction but also in the compression and extension directions, the elastic body has a high spring constant in the vehicle width direction, and is an exhaust part. The support rigidity in the vehicle width direction is increased.

Exhaust system overall side view provided with a support device for exhaust parts (first embodiment) FIG. 1 is an overall plan view of an exhaust system provided with a support device for exhaust parts as viewed in the direction of arrow 2 (first embodiment) Enlarged view of the phantom line encircled portion in the direction of arrow 3 in FIG. 1 (first embodiment). Enlarged view of the phantom line encircled portion shown in the arrow 4 in FIG. 1 (first embodiment). Enlarged perspective view taken along arrow 5 in FIG. 4 (first embodiment) (A) is an enlarged view taken along line 6-6 in FIG. 4, (B) is a cross-sectional view along line BB in (A) (first embodiment). (A) is the same figure as FIG. 6 (A) of another high-rigidity elastic body in the vehicle width direction (modified example), and (B) is a cross-sectional view along line BB of (A) (first embodiment). Overall plan view of the exhaust system equipped with a support device for exhaust parts (reference example)

  Hereinafter, based on FIGS. 1-7, 1st Embodiment at the time of implementing the support apparatus of this invention exhaust components to the exhaust system connected with an engine for motor vehicles is described.

  In the following description, the front and rear sides in the forward direction of the automobile are front and rear, the left and right sides in the forward direction are left and right, the ceiling side is up, and the floor side is down.

  As shown in FIGS. 1 and 2, an exhaust system Ex for discharging exhaust gas discharged from the exhaust port of the engine E of the automobile to the outside is connected to the exhaust port of the engine E of the automobile. The exhaust system Ex includes an exhaust pipe 1 connected to an exhaust port of a direct type catalyst CA connected to an exhaust port of the engine E via a spherical joint BJ and vertically running under the floor of an automobile in the front-rear direction, and the exhaust pipe. 1, an auxiliary silencer Ma connected in the middle of 1, a main silencer M connected to the downstream end of the exhaust pipe 1, and a tail pipe 2 connected to the rear end of the main silencer M, The upstream side of the auxiliary silencer Ma of the exhaust pipe 1 is supported by the vehicle body B by a cross-shaped rubber R1, and between the auxiliary silencer Ma and the main silencer M of the exhaust pipe 1 is an oval rubber R2, R2 and The cross-shaped rubber R1 is supported on the vehicle body B, and the tail pipe 2 is supported on the vehicle body B by the oval rubber R2.

  Further, the left end wall 12 of the silencer M is supported by an elastic body D (hereinafter referred to as a high rigidity elastic body in the vehicle width direction) D having a high support rigidity in the vehicle width direction.

  The exhaust gas discharged from the engine E and flowing through the exhaust pipe 1 is silenced through the auxiliary silencer Ma and the main silencer M, and then released to the atmosphere via the tail pipe 2 at the rear end of the silencer M.

  The main silencer M in the first embodiment corresponds to the “silencer” in the claims.

  Since the cross-shaped rubber R1 and the oval rubber R2 are both conventionally known, their structures will be briefly described.

  As shown in FIG. 5, the cross-shaped rubber R <b> 1 has a rubber body 40 having a bending hole 41 in the middle portion, a vehicle body side mounting hole 42 penetrating in the width direction, and a thickness direction perpendicular to the mounting hole 42. An exhaust part-side mounting hole 43 penetrating therethrough, and a vehicle-body-side support member 44 is inserted into and connected to the vehicle-body-side mounting hole 42, and an exhaust-part-side support member 45 is inserted into the exhaust part-side mounting hole 43. Connected.

  Further, as shown in FIG. 5, the oval rubber R2 penetrates in the upper and lower portions of the oval rubber body 50 in which the upper space 52 and the lower space 53 are formed by the connecting portion 51 in the thickness direction. A vehicle body side mounting hole 54 and an exhaust component side mounting hole 55 are provided, and a vehicle body side support member 56 is inserted into and connected to the vehicle body side mounting hole 54, and the exhaust component side mounting hole 55 is connected to the exhaust component side mounting hole 55. The support member 57 is inserted and connected.

  The cross-shaped rubber R1 and the oval rubber R2 are both easily elastically deformed in the vertical direction, and the exhaust parts are softly elastically supported in the vertical direction.

  As shown in FIG. 5, the main silencer M is formed in an elliptical cylinder shape that is long in the vehicle transverse direction of the vehicle body B, that is, in a direction transverse to the longitudinal direction of the vehicle body B. A shell 11 that is long in the vehicle width direction and left and right end walls 12 and 13 that close both left and right ends of the shell 11 are formed. The right end wall 13 is connected to both the downstream end of the exhaust pipe 1 for introducing exhaust gas into the main silencer M and the tail pipe 2 for releasing the exhaust gas in the silencer body 10 to the outside. ing.

  Next, a structure for supporting the main silencer M on the vehicle body B will be described with reference to FIGS.

  The main silencer M is elastically supported under the floor of the vehicle body B via an elastic body D (hereinafter referred to as a high rigidity elastic body in the vehicle width direction) D having a high support rigidity in the vehicle width direction.

  The highly rigid elastic body D in the vehicle width direction is outside the end wall 12 on the left side of the main silencer M, and the left-right direction thereof is on a substantially center line L1-L1 in the vehicle width direction passing through the center of gravity G1 of the main silencer M. The main silencer M is disposed at a position slightly displaced in the front-rear direction from the center of gravity line L1-L1 (FIG. 2) via the vehicle body side support member 15 and the pair of silencer side support members 16, 17. Is elastically supported by the vehicle body B.

  The pair of silencer-side support members 16, 17 are fixed to a bracket 18 made of a stay and welded to the center of the outer surface of the left end wall 12 of the main silencer M with a gap in the vehicle width direction. It is bent toward the body D, and is inserted and connected to a pair of second mounting portions 27 and 28 provided on the elastic body D. On the other hand, a vehicle body side support member 15 made of a stay, which is fixedly supported at an appropriate position on the bottom surface of the vehicle body B, is bent toward the elastic body D and is inserted and connected to a first mounting portion 25 provided on the elastic body D. .

  Next, the structure of the highly rigid elastic body D in the vehicle width direction will be described with reference to FIG.

  The elastic body D is formed of a single rubber rubber, has an elliptical shape that is long in the left-right direction, that is, the vehicle width direction, and short in the vertical direction, and has a predetermined thickness in the front-rear direction. And in the center part, the hollow part 21 surrounded by the endless annular peripheral part 20 and penetrating in the thickness direction is formed, In the hollow part 21, the left and right elastic support parts 22, A first mounting portion 25 supported by the peripheral edge portion 20 by 23 is provided so as to be displaceable in the left-right direction and the up-down direction. A first mounting hole 26 having an axial line in the front-rear direction is provided at the center of the first mounting part 25, and the front and rear of the vehicle body side support member 15 provided at a proper position of the vehicle body B in the first mounting hole 26. A free end bent in the direction is inserted and connected. In addition, two second attachment portions 27 and 28 are provided symmetrically in the left-right direction (vehicle width direction) on the left and right side portions of the endless annular peripheral edge portion 20 of the elastic body D. These second attachment portions 27, 28 are inserted into the second mounting holes 29, 30 respectively, and the free end portions bent in the front-rear direction of the exhaust component side provided in the main silencer M, that is, the silencer side support members 16, 17, respectively. Connected.

  Thus, the left and right elastic support portions 22 and 23 have a high spring constant in the same direction so that one of the left and right elastic support portions 22 and 23 is compressed and the other is expanded with respect to the input in the left-right direction (vehicle width direction). On the other hand, it is designed to be elastically deformed by shearing with respect to the input in the vertical direction and has a low spring constant in the same direction. The upper and lower surfaces of the first mounting portion 25 abut against the upper and lower inner surfaces of the hollow portion 21, thereby restricting the vertical displacement of the support portion.

  The left and right elastic support portions 22 and 23 of the highly rigid elastic body D in the vehicle width direction substantially coincide with the center line L1-L1 in the left and right direction (vehicle width direction) passing through the center of gravity G of the main silencer M as an exhaust part. Since the main silencer M is supported by the vehicle body B through the elastic body D, the support rigidity (holding force) in the vehicle width direction of the main silencer M is increased.

  Now, when the vehicle body B moves in the vehicle width direction, such as when the vehicle is running on a curve, the pair of left and right elastic support portions 22 and 23 of the vehicle width direction high-rigidity elastic body D are as shown by arrows in FIG. One side is compressed with respect to the input in the vehicle width direction and the other is extended so that high spring rigidity can be exerted in the vehicle width direction, and immediately follows the movement of the vehicle body B in the vehicle width direction. In addition, the main silencer M, which is an exhaust part, can be moved in the same direction, so that the movement of the main silencer M is delayed and transmitted to the vehicle body B with respect to the movement of the vehicle body B in the vehicle width direction. It is suppressed and the steering feeling can be improved.

  The main body silencer M, which is an exhaust part, may be supported on the vehicle body B by the elastic body D by using two vehicle body side support members and one exhaust part side support member. In this case, the positions of the first attachment portion 25 and the second attachment portions 27 and 28 provided on the elastic body D are interchanged. That is, one second attachment portion is located at the center of the elastic body D, and two first attachment portions are located on the left and right sides thereof.

  FIG. 7 shows a modification of the highly rigid elastic body in the vehicle width direction.

  In this modification, the highly rigid elastic body D ′ in the vehicle width direction has a triangular shape when viewed from the front-rear direction of the vehicle, and a pair of left and right elastic support portions are provided on both side surfaces in the left-right direction (vehicle width direction). 122 and 123 are arranged in an oblique direction. In addition, a hollow portion 121 penetrating in the front-rear direction is formed in the central portion of the elastic body D ′, and a first mounting hole 126 for mounting the vehicle body side support member 15 is provided in the upper portion thereof. One attachment portion 125 is provided, and two second attachment holes 129 and 130 for attaching the exhaust-side support members 16 and 17 are provided in the second attachment portions 127 and 128 on the left and right side portions thereof.

  By the way, in this modification, the left and right elastic support portions 122 and 123 are arranged in an oblique direction, but the input in the vehicle width direction acts not only in the shear direction (bending direction) but also in the compression and extension directions. Therefore, like the elastic body D, it has a high spring constant in the vehicle width direction. Thereby, the support rigidity of the vehicle width direction of exhaust parts, such as a silencer and an exhaust pipe, is improved.

  In this modification as well, the positions of the first mounting portion and the second mounting portion are interchanged so that there are two vehicle body side support members made of stays, and the exhaust component side support members made of stays are also made into one exhaust component. Can be supported on the vehicle body. In this case, the elastic body D ′ of the modified example is used in a state where it is turned 180 degrees from the state shown in FIG. 7 so that the two first attachment portions are located above and the one second attachment portion is located below. .

Next, with reference to FIG. 8, a reference example of a support device for exhaust parts will be described.

Incidentally, in this reference example, the same as the first embodiment of the present invention, the same sign-is attached.

In this reference example , the exhaust pipe 1, the auxiliary silencer Ma, the main silencer M, the tail pipe 2, etc. from the lower half of the spherical joint BJ following the direct type catalyst CA to the connection portion of the main silencer M are all included. A vehicle width that passes through the entire center of gravity G2 of the exhaust system Ex by the high rigidity elastic body D in the vehicle width direction, which is one of a plurality of elastic bodies that support the exhaust system Ex together with the exhaust parts. The exhaust pipe 1 that is one of the exhaust parts of the exhaust system Ex is supported on the approximate center of gravity line L2-L2 (a position slightly shifted in the front-rear direction from the center of gravity line L2-L2).

  The center of gravity G2 of the entire exhaust system including a plurality of exhaust parts is between the auxiliary silencer Ma and the main silencer M, and the center line L2-L2 in the vehicle width direction passing through the center of gravity G2 is the auxiliary silencer Ma. The exhaust pipe 1 is supported by the vehicle body B via the highly rigid elastic body D in the vehicle width direction on the center line L2-L2 of the exhaust part, that is, the exhaust pipe 1 on the downstream side. .

  The structure for supporting the exhaust part, that is, the exhaust pipe 1 to the vehicle body B by the highly rigid elastic body D in the vehicle width direction is the same as the structure for supporting the main muffler M to the vehicle body B in the first embodiment. In the width direction high-rigidity elastic body D, the pair of elastic support portions 22 and 23 are arranged along the direction of the center of gravity L2-L2, the first mounting portion 25 is disposed on the vehicle body side support member 15, and the second mounting portion 27 is disposed. , 28 are attached to the exhaust component side support members 16, 17, respectively.

  When the vehicle body B moves in the vehicle width direction due to a vehicle running on a curve or the like, the pair of elastic support portions 22 and 23 of the elastic body D is in response to an input in the vehicle width direction as in the first embodiment. One side is compressed and the other side is extended to exhibit high spring rigidity in the vehicle width direction, and the exhaust pipe 1 is moved in the same direction so as to immediately follow the movement of the vehicle body B in the vehicle width direction. As a result, the movement of the exhaust pipe system Ex is delayed from being transmitted to the vehicle body B with respect to the movement of the vehicle body B in the vehicle width direction, and the steering feeling can be improved.

  In this reference example, the left end wall 12 of the main silencer M is supported by the vehicle body B via a cross-shaped rubber R1.

  Also in this reference example, instead of the elastic body D having a high support rigidity in the vehicle width direction, an elastic body D ′ having a high support rigidity in another vehicle width direction shown in FIG. 7 may be used.

The embodiments of the present invention have been described above, but various design changes can be made without departing from the scope of the present invention .

1 One of the exhaust parts (exhaust pipe)
11 Shell
12 End wall
13 End wall 15 Car body side support member 16 Exhaust part side support member (silencer side support member)
17 Exhaust component side support member (silencer side support member)
18 Brackets 22, 122 Elastic support portions 23, 123 Elastic support portions 25, 125 First mounting portion
26, 126 First mounting holes 27, 127 Second mounting portions 28, 128 Second mounting portions
29,129 second mounting holes 30, 130 second mounting holes,
B Body D, D 'Elastic body (High rigidity elastic body in the vehicle width direction)
G1 Center of gravity M Silencer (main silencer)
L1-L1 center of gravity line (for silencer)

Claims (3)

An exhaust component support device that elastically supports a silencer (M), which is one of a plurality of exhaust components, under a floor of a vehicle body (B) via an elastic body (D; D ′),
The elastic body (D; D ′) supports the silencer (M) on the center line (L1-L1) in the vehicle width direction passing through the center of gravity (G1) of the silencer (M), first mounting portion supporting member (15) is only attached; (25 125), the muffler support member second mounting portion (16, 17) is only attached; and (27, 28 127, 128), the The first mounting portion (25; 125) is connected to the second mounting portion (27; 28; 127, 128) and a load in the vehicle width direction is applied to the silencer (M). ) And the second mounting portion (27, 28; 127, 128), and an elastic support portion (22, 23; 122, 123) that compresses and extends,
The vehicle body side support member (15) and the silencer side support member (16, 17) extend in the front-rear direction of the vehicle body (B), and the first attachment portion (25; 125) and the second attachment portion. (27, 28; 127, 128) are inserted through the first mounting hole (26; 126) and the second mounting hole (29, 30; 129, 130), respectively.
The vehicle body side support member (15) and the silencer side support member (16, 17) are arranged on a vehicle center line (L1-L1) in the vehicle width direction passing through the center of gravity (G1) of the silencer (M). A support device for exhaust parts, which is arranged in parallel in the width direction . The silencer (M) includes a shell (11) that is long in the vehicle width direction and end walls (12, 13) that close both left and right ends, and an exhaust pipe (1) is connected to one end wall (13). The muffler-side support member (16, 17) having a bracket (18) protruding in the vehicle width direction is fixed to the other end wall (12), and the muffler-side support member (16, 17) is The exhaust part supporting device according to claim 1, characterized in that a front end thereof extends from the bracket (18) toward the rear of the vehicle body . The first mounting hole (126) is spaced apart from the second mounting hole (129, 130) in the vertical direction of the vehicle body, and the elastic support portions (122, 123) are formed in the first mounting hole (126). ) And the second mounting hole (129, 130), the exhaust part according to claim 1 or 2, wherein the exhaust part extends in a direction inclined with respect to the vehicle width direction. Support device.

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