JP2017125463A - Exhaust muffler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance versatility, assemblability, and the degree of freedom in a pipe layout and allow reduction of the weight in an exhaust muffler in which a recess extending over the entire longitudinal length of a body part forming a part of a shell is formed in at least one part along the circumferential direction of the outer periphery of the body part.SOLUTION: A shell 11 is comprised of a cylindrical member 14, a first lid member 15 of a bottomed cylindrical shape having a first fitting cylindrical part 15a which is fitted and welded to one end of the cylindrical member 14, and a second lid member 16 of a bottomed cylindrical shape having a second fitting cylindrical part 16a which is fitted and welded to the other end of the cylindrical member 14 and forms a body part 12 in cooperation with the cylindrical member 14 and the first fitting cylindrical part 15a. Separators 18, 19 are welded to the inner periphery of the cylindrical member 14, and in at least one of the first and second lid members 15, 16, an inlet pipe 24 and an outlet pipe 25, which are held by the separators 18, 19, are inserted.SELECTED DRAWING: Figure 1

Description

  The present invention includes a shell in which both ends of a cylindrical body portion are closed, and a separator fixed to the inner periphery of the body portion so as to divide the inside of the shell into a plurality of parts. The present invention relates to an exhaust silencer in which a concave portion recessed inward is formed in at least one place along the circumferential direction of the outer periphery over the entire length in the longitudinal direction of the body portion.

  Such an exhaust silencer is known from Patent Document 1, for example.

JP 2015-14209 A

  In the one disclosed in Patent Document 1, a shell is configured by welding a half member in which a concave portion is formed on the outer surface and another half member, and the structure of such a shell. Then, a dedicated press die for forming the half member is required, and the capacity of the exhaust silencer cannot be adjusted, so that the versatility is lacking. Moreover, when the separator is welded and fixed to the shell, the inside of the shell cannot be confirmed, and not only complicated positioning means are required to set the separator so as to contact the inner surface of the shell. Both the split member and the separator need to be manufactured with high accuracy.

  In addition, it is necessary to arrange the inlet pipe and the outlet pipe together in one of the pair of half members, which restricts the pipe layout, so that the inlet pipe and the outlet pipe are separated at both ends of the shell. When the separator is installed, the separator holding the inlet pipe and the outlet pipe is arranged in the half member so that the inlet pipe and the outlet pipe are inserted outward from the inside of one half member. It is difficult to do this, and it is necessary to insert one of the inlet pipe and the outlet pipe into the half member from the outside, which complicates the assembling work and increases the cost.

  By the way, in the thing disclosed in the above-mentioned patent document 1, it is necessary to provide a rib or the like on the inner surface of the shell or to form irregularities on the shell in order to suppress the radiated sound. Thus, the shape of the joint between the shell and the separator becomes complicated.

  The present invention has been made in view of such circumstances, and it is not necessary to prepare a large number of dedicated press dies, thereby facilitating capacity adjustment, thereby increasing versatility, and the separator can be easily and reliably provided on the inner surface of the shell. It is an object of the present invention to provide an exhaust muffler that can be welded to each other to improve the assemblability and increase the degree of freedom in pipe layout.

  In order to achieve the above object, the present invention provides a shell in which both ends of a cylindrical body portion are closed, and a separator fixed to the inner periphery of the body portion so as to divide the inside of the shell into a plurality of portions. In an exhaust silencer in which a recess recessed inwardly is formed over the entire length in the longitudinal direction of the body part at least at one place along the circumferential direction of the outer periphery of the body part, the shell includes a tubular member, The cylindrical member has a cross-sectional shape corresponding to the cross-sectional shape of the one end portion, and has a first fitting cylindrical portion that is fitted and welded to the one end portion of the cylindrical member, and is formed into a bottomed cylindrical shape. A first lid member having a cross-sectional shape corresponding to a cross-sectional shape of the other end portion of the cylindrical member, and being fitted and welded to the other end portion of the cylindrical member, and the cylindrical member and the first member A bottomed cylindrical shape having a second fitting cylinder part that constitutes the body part in cooperation with the fitting cylinder part And a separator having an outer peripheral shape corresponding to the inner peripheral shape of the cylindrical member is welded to the inner periphery of the cylindrical member, and at least one of the first and second lid members In addition, the inlet pipe and the outlet pipe held by the separator are inserted so that the end portions of these pipes protrude outward from at least one of the first and second lid members. And

  According to the present invention, in addition to the configuration of the first feature, both end portions of the cylindrical member are fitted to the first and second fitting cylindrical portions, and the outer circumferences of the pair of separators are A second feature is that welding is performed on the inner periphery of both ends.

  Furthermore, in addition to the configuration of the second feature of the present invention, a welded portion of the first and second fitting tube portions to the tubular member is a welded portion of the pair of separators to the tubular member, A third feature is that the cylindrical member is set at a position overlapping in the longitudinal direction.

  According to the first feature of the present invention, the shell is constituted by the tubular member and the first and second lid members fitted and welded to both ends of the tubular member, so that the capacity is changed. Sometimes it is sufficient to change the length of the cylindrical member, and the first and second lid members can be used in common, so that it is not necessary to prepare a large number of dedicated press dies, thereby facilitating capacity adjustment. Versatility can be improved. The first and second lid members have first and second fitting tube portions corresponding to the cross-sectional shape of the end portion of the tubular member, and the first and second fitting members are fitted to both ends of the tubular member. The separator is fitted and welded, and a separator having an outer peripheral shape corresponding to the inner peripheral shape of the end cylindrical member is welded to the inner periphery of the cylindrical member. Assembling property can be improved by welding to the inner surface of the shell. Moreover, the separator is cylindrical at a portion corresponding to a concave portion that is formed at least at one place along the circumferential direction of the outer periphery of the body portion constituted by the cylindrical member and the first and second fitting cylindrical portions and is recessed inwardly. Since it is welded to the inner periphery of the member, it is possible to increase the rigidity of the body portion at the portion where the rigidity is reduced by forming the recess, thereby reducing the radiated sound. Further, the inlet pipe and the outlet pipe are held by the separator fixed to the cylindrical member, and the first and second lid members are welded to the cylindrical member from both sides, so that the inlet pipe and the outlet pipe are held. By welding the first and second lid members from both sides to the cylindrical member in a state where the separator is fixed, the inlet pipe and the outlet pipe are connected to at least one of the first and second lid members from the inside. It is easy to insert, and the assembling work is simplified and the cost can be reduced.

  According to the second feature of the present invention, since the outer periphery of the separator is welded to the inner periphery of both ends of the cylindrical member, the rigidity of the cylindrical member is ensured and the separator can be easily positioned with respect to the cylindrical member. Assembly can be improved.

  Furthermore, according to the third feature of the present invention, the first and second fitting tube portions are welded to the tubular member at a position where they overlap the welded portion of the pair of separators to the tubular member in the longitudinal direction of the tubular member. Thus, the assembly can be simplified by facilitating the positioning of the first and second lid members with respect to the tubular member. Moreover, while welding one side of a 1st fitting cylinder part, a cylindrical member, and a pair of separator simultaneously, the other of a 2nd fitting cylinder part, a cylindrical member, and a pair of separator can be welded simultaneously, and so Assembly can be made easier.

It is a top view of the exhaust silencer of a 1st embodiment. It is a side view of the exhaust silencer seen from the 2 arrow direction of FIG. FIG. 3 is a sectional view taken along line 3-3 in FIG. 1. FIG. 4 is a sectional view taken along line 4-4 of FIG. FIG. 5 is a sectional view taken along line 5-5 of FIG. It is a top view of the exhaust silencer of a 2nd embodiment. FIG. 7 is a cross-sectional view taken along line 7-7 in FIG. 6.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  The first embodiment of the present invention will be described with reference to FIGS. 1 to 5. First, in FIGS. 1 to 3, an exhaust silencer shell 11 used in, for example, a four-wheel vehicle has a longitudinal direction when mounted on the vehicle. Is formed by closing both ends of the cylindrical body portion 12 arranged along the vehicle front-rear direction, and at least one place along the circumferential direction of the outer periphery of the body portion 12 (1 in this embodiment). In order to avoid a body frame (not shown) when the vehicle is mounted, a recess 13 that is recessed inward is formed over the entire length in the longitudinal direction of the body portion 12.

  The shell 11 has a tubular member 14 and a cross-sectional shape corresponding to the cross-sectional shape of the one end portion of the tubular member 14, while one end portion of the tubular member 14 (in this embodiment, the front end in the vehicle front-rear direction). 1st cover member 15 which has the 1st fitting cylinder part 15a fitted and welded to a part, and is formed in a bottomed cylinder shape, and the other end part of this cylindrical member 14 (in this embodiment) The tubular member 14 and the first fitting tubular portion 15a are fitted and welded to the other end portion of the tubular member 14 while having a sectional shape corresponding to the sectional shape of the rear end portion of the vehicle longitudinal direction). The second lid member 16 is formed in a bottomed cylindrical shape having a second fitting cylindrical portion 16a that constitutes the body portion 12 in cooperation with.

  Referring also to FIG. 4, both end portions of the tubular member 14 are fitted and welded to the first and second fitting tube portions 15a and 16a, and the tubular member 14 and the first fitting tube are joined. The outer peripheries of the portion 15a and the second fitting cylinder portion 16a are formed so as to constitute the concave portion 13 in cooperation. Further, in order to support the shell 11 by the vehicle body frame, a stay 17 formed by welding a bar member to the outer surface of the second lid member 16 is provided, for example.

  The inside of the shell 11 is divided into a plurality of separators that are fixed to the inner periphery of the body portion 12. In this embodiment, the shell 11 has an outer peripheral shape corresponding to the inner peripheral shape of the cylindrical member 14. The first and second separators 18 and 19 are welded to the inner periphery of the tubular member 14. In this embodiment, the first and second separators 18 and 19 are formed so as to have flanges 18a and 19a on the outer periphery, which are in contact with the inner peripheral surface of the cylindrical member 14, respectively. The flange portion 18a is welded to the inner periphery of the tubular member 14 at a position adjacent to the first fitting tubular portion 15a in which the one end portion of the tubular member 14 is fitted and welded in the longitudinal direction. The flange part 19a of the second separator 19 is located at a position adjacent to the second fitting cylinder part 16a fitted and welded to the other end part of the cylindrical member 14 in the longitudinal direction. Welded around.

  Within the shell 11, a downstream expansion chamber 20 is formed between the first lid member 15 and the first separator 18, and an upstream expansion chamber 21 is formed between the second lid member 16 and the second separator 19, A sound absorbing chamber 22 is formed between the first and second separators 18 and 19, and the sound absorbing chamber 22 is filled with a sound absorbing material 23 such as glass wool.

  At least one of the first and second lid members 15, 16 has an inlet pipe 24 and an outlet pipe 25 held by the first and second separators 18, 19, and ends of the pipes 24, 25 are connected to the first ends. In addition, in this embodiment, the inlet pipe 24 held by the first and second separators 18 and 19 is inserted through the outer lid so as to protrude outwardly from at least one of the second lid members 15 and 16. The outlet pipe 25 inserted through the first lid member 15 so that the upstream end portion 26 protrudes outward from the first lid member 15 and held by the first and second separators is connected to the downstream end portion 27. Is inserted through the second lid member 16 so as to protrude outward from the second lid member 16. An exhaust pipe (not shown) for guiding exhaust gas of an engine (not shown) mounted on the vehicle is connected to the upstream end part 26 of the inlet pipe 24, and the downstream end part 27 of the outlet pipe 25 is connected to the atmosphere. Opened.

  Referring also to FIG. 5, the inlet pipe 24 has an upstream end 26 projecting obliquely downward from the lower outer surface of the first lid member 15 at one end, and the lower outer surface of the first lid member 15. And the other end of the bending tube portion 24a penetrates the first and second separators 18 and 19, and the other end enters the upstream expansion chamber 21. A plurality of punching holes 28 are formed in a portion of the straight pipe portion 24b facing the sound absorption chamber 22 so as to have a straight pipe portion 24b.

  The outlet pipe 25 has a first straight pipe portion 25a having one end opened to the downstream expansion chamber 20 and extending substantially horizontally, and one end connected to the other end of the first straight pipe portion 25a. And a second straight pipe portion that passes through the second separators 18 and 19 and is inserted into the lower portion of the second lid member 16 while projecting the other end portion as a downstream end portion 27 to the outside of the second lid member 16. 25b and a bent shape.

  The straight pipe portion 24 b of the inlet pipe 24 is inserted and held in first and second holding cylinder portions 18 b and 19 b formed by burring in the first and second separators 18 and 19, and the first pipe portion 24 b of the outlet pipe 25. The two straight pipe portions 25b are inserted and held in third and fourth holding cylinder portions 18c and 19c formed in the first and second separators 18 and 19 by burring.

  The fifth and sixth holding cylinder portions 18d and 19d formed by burring in the first and second separators 18 and 19 are inserted and held through a communication pipe 29 which is a straight pipe, and the upstream expansion chamber 21 and the downstream expansion chamber 20 communicate with each other via the communication pipe 29.

  Next, the operation of the first embodiment will be described. The shell 11 of the exhaust silencer is formed by closing both ends of the cylindrical body 12 and is recessed inwardly on the outer periphery of the body 12. 13 is formed over the entire length in the longitudinal direction. The shell 11 has a cylindrical member 14, a first lid member 15 welded to one end of the cylindrical member 14, and the cylindrical member 14. Since it consists of the 2nd cover member 16 welded to an edge part, when changing a capacity | capacitance, what is necessary is just to change the length of the cylindrical member 14, and the 1st and 2nd cover members 15 and 16 are used in common. Therefore, versatility can be enhanced by making it easy to adjust the capacity without preparing many dedicated press dies.

  The first lid member 15 has a cross-sectional shape corresponding to the cross-sectional shape of the one end portion of the cylindrical member 14 and is fitted and welded to one end portion of the cylindrical member 14. The second lid member 16 has a cross-sectional shape corresponding to the cross-sectional shape of the other end portion of the cylindrical member 14 and is provided at the other end portion of the cylindrical member 14. It is fitted and welded and has a second fitting cylinder part 16a that constitutes the body part 12 in cooperation with the cylindrical member 14 and the first fitting cylinder part 15a, and is formed into a bottomed cylindrical shape. The first and second separators 18 and 19 that divide the inside of the shell 11 into a plurality have an outer peripheral shape corresponding to the inner peripheral shape of the cylindrical member 14 and are welded to the inner periphery of the cylindrical member 14. It is easy to weld, and the first and second separators 18 and 19 are easily and reliably welded to the inner surface of the shell 11. It is possible to enhance the resistance assembly so as to be. Moreover, it corresponds to the concave portion 13 formed in at least one place along the circumferential direction of the outer periphery of the body portion 12 constituted by the cylindrical member 14 and the first and second fitting cylindrical portions 15a and 16a and recessed inward. Since the first and second separators 18 and 19 are welded to the inner periphery of the cylindrical member 14 at the portion, it is possible to increase the rigidity of the body portion 12 at the portion where the rigidity is lowered by forming the recess 13. Yes, thereby reducing radiated sound.

  Further, the inlet pipe 24 held by the first and second separators 18 and 19 is inserted into the first lid member 15 so that the upstream end portion 26 protrudes outward from the first lid member 15, and the first And the outlet pipe 25 held by the second separators 18 and 19 is inserted into the second lid member 16 so that the downstream end portion 27 protrudes outward from the second lid member 16. By welding the first and second lid members 15 and 16 from both sides to the cylindrical member 14 in a state in which the first and second separators 18 and 19 holding the outlet pipe 25 are fixed, the inlet pipe 24 It is easy to insert the outlet pipe 25 into the first and second lid members 15 and 16 from the inside, and the assembling work is simplified and the cost is reduced. It is possible to achieve the reduction.

  A second embodiment of the present invention will be described with reference to FIG. 6 and FIG. 7, but the parts corresponding to the first embodiment are only given the same reference numerals and are shown in detail. The detailed explanation is omitted.

  The shell 11 of the exhaust silencer is formed by closing both ends of a cylindrical body 12, and an indented recess 13 is formed in one place along the circumferential direction of the outer periphery of the body 12. The portion 12 is formed over the entire length in the longitudinal direction.

  The tubular member 14 has a first fitting tubular portion 15a that is fitted and welded to one end of the tubular member 14 while having a cross-sectional shape corresponding to the cross-sectional shape of the one end of the tubular member 14. The first lid member 15 is formed into a bottomed cylindrical shape, and is fitted to the other end portion of the cylindrical member 14 while having a cross-sectional shape corresponding to the cross-sectional shape of the other end portion of the cylindrical member 14. First, it is welded and has a second fitting cylinder part 16a that forms the body part 12 in cooperation with the cylindrical member 14 and the first fitting cylinder part 15a, and is formed into a bottomed cylindrical shape. The inside of the shell 11 composed of the two lid members 16 is divided into a downstream expansion chamber 20, an upstream expansion chamber 21 and a sound absorption chamber 22 by first and second separators 18 and 19, and the first and second separators are separated. The outer peripheries of 18 and 19 are welded to the inner peripheries of both ends of the cylindrical member 14.

  Moreover, both end portions of the tubular member 14 are fitted and welded to the first and second fitting tube portions 16a, and the welded portion 31 of the first and second fitting tube portions 16a to the tubular member 14 is welded. , 32 are set at positions overlapping the welded portions 33, 34 of the first and second separators 18, 19 to the tubular member 14 in the longitudinal direction of the tubular member 14, and this second In this embodiment, one end of the tubular member 14, the first fitting tubular portion 15 a of the first lid member 15, and the first separator are welded together by laser welding, and the other end of the tubular member 14. The second fitting cylinder portion 16a of the second lid member 16 and the second separator are welded together by laser welding.

  According to the second embodiment, since the outer circumferences of the first and second separators 18 and 19 are welded to the inner circumferences of both end portions of the cylindrical member 14, the rigidity of the cylindrical member 14 is ensured and the cylinder is secured. The first and second separators 18 and 19 can be easily positioned with respect to the shaped member 14 and the assemblability can be improved.

  In addition, the first and second fitting tube portions 15a, 15a, 15a, 15b, and 15c are formed on the tubular member 14 at positions where the welded portions 31, 32 of the first and second separators 18, 19 overlap the tubular member 14 in the longitudinal direction. Since 16a is welded, assembly of the first and second lid members 15 and 16 with respect to the tubular member 14 can be facilitated and the assembly can be simplified. In addition, the first fitting cylinder 15a, the cylindrical member 14 and the first separator 18 can be welded simultaneously, and the second fitting cylinder 16a, the cylindrical member 14 and the second separator 19 can be welded simultaneously. Then, assembly can be made easier.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the present invention described in the claims. Is possible.

DESCRIPTION OF SYMBOLS 11 ... Shell 12 ... Body part 13 ... Recessed part 14 ... Cylindrical member 15 ... 1st cover member 15a ... 1st fitting cylinder part 16 ... 2nd cover member 16a ... 2nd fitting cylinder part 18, 19 ... Separator 24 ... Inlet pipe 25 ... Outlet pipe 31, 32, 33, 34 ... Welding part

Claims (3)

  A shell (11) in which both ends of the cylindrical body (12) are closed, and a separator fixed to the inner periphery of the body (12) so as to divide the shell (11) into a plurality of parts. (18, 19), and at least one portion along the circumferential direction of the body portion (12), an inwardly recessed portion (13) is formed over the entire length in the longitudinal direction of the body portion (12). In the container, the shell (11) has a cross-sectional shape corresponding to the cross-sectional shape of the cylindrical member (14) and one end of the cylindrical member (14), and one end of the cylindrical member (14). A first lid member (15) having a first fitting cylinder part (15a) fitted and welded to the bottom and formed in a bottomed cylindrical shape, and a cross section of the other end part of the cylindrical member (14) When fitted and welded to the other end of the cylindrical member (14) while having a cross-sectional shape corresponding to the shape In addition, it has a second fitting cylinder part (16a) that constitutes the body part (12) in cooperation with the cylindrical member (14) and the first fitting cylinder part (15a), and has a bottomed cylindrical shape. The separator (18, 19) having an outer peripheral shape corresponding to the inner peripheral shape of the cylindrical member (14) is formed in the cylindrical member (14). An inlet pipe (24) and an outlet pipe (25) held by the separator (18, 19) are attached to at least one of the first and second lid members (15, 16). 24, 25) An exhaust silencer, wherein the end of 24, 25) is inserted so as to protrude outwardly from at least one of the first and second lid members (15, 16).   Both end portions of the cylindrical member (14) are fitted to the first and second fitting cylindrical portions (15a, 16a), and the outer circumferences of the pair of separators (18, 19) are connected to the cylindrical member (14). The exhaust silencer according to claim 1, wherein the exhaust silencer is welded to inner peripheries of both ends.   The welded portions (31, 32) of the first and second fitting tube portions (15a, 16a) to the tubular member (14) are the tubular members (14) of the pair of separators (18, 19). 3. The exhaust silencer according to claim 2, wherein the exhaust silencer is set at a position overlapping with a welded portion (33, 34) in the longitudinal direction of the cylindrical member (14).

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