JP5979493B2 - Engine exhaust muffler - Google Patents

Description

  The present invention relates to a cylindrical body, a muffler body composed of first and second end walls closing both axial end surfaces of the body, a partition wall for partitioning the interior of the muffler body into a plurality of sound deadening chambers, and the partition wall. An exhaust muffler for an engine, comprising: a silencer pipe that is supported through the exhaust pipe; and an inlet pipe or an outlet pipe that is supported through the sidewall of the fuselage and communicates with one end of the silencer pipe. Regarding improvements.

  Such an exhaust muffler of an engine is already known as disclosed in Patent Document 1.

JP 2008-31888 A

  In an exhaust muffler of an engine as disclosed in Patent Document 1, a muffler body is composed of a single fuselage formed by rolling a steel plate and an end wall welded to both ends of the fuselage. An L-shaped tube bent in a direction perpendicular to the axis line is connected to a muffler tube supported by a partition fixed to the wall, and this L-shaped tube and an inlet tube supported through the side wall of the fuselage And are welded together.

  In such an exhaust muffler structure, the L-shaped tube is supported by a partition wall fixed to the fuselage via a silencer tube, so that the fitting position with the inlet pipe directly supported by the fuselage is aligned. High machining accuracy is required, which increases production costs.

  The present invention has been made in view of such circumstances. When the L-shaped tube is connected to the muffler tube, the fitting position of the L-shaped tube and the inlet tube or the outlet tube supported by the fuselage is adjusted. When the L-shaped tube is connected to the inlet tube or the outlet tube supported by the fuselage, the fitting position of the L-shaped tube and the muffler tube supported by the partition wall is easy. An object of the present invention is to provide an exhaust muffler for an engine that can be easily assembled without requiring high accuracy.

In order to achieve the above object, the present invention provides a muffler body comprising a cylindrical body, first and second end walls closing both axial end faces of the body, and a plurality of muffler interiors. a partition wall for partitioning the chamber, to the partition wall, a silencer tube supported therethrough, the side wall of the body, an inlet tube communicating with said muffler tube is supported therethrough, the exhaust of the engine In the muffler, the fuselage is constructed by fitting and welding the opposing ends of the first and second barrels divided in the axial direction, and providing the partition wall on the second barrel, 1 barrel a bottomed cylindrical integral with said first end wall, the inlet pipe provided in its side wall, communicating with each other and the muffler tube and the inlet tube via a L-shaped tube, said L one end of the shaped tube is welded to one of the inlet pipe or the muffler tube, the other end, said Mated with other port pipe or the muffler tube, said supporting both end portions of the outlet tube by a partition and the first end wall, and to be positioned substantially at right angles to the outlet pipe and the inlet pipe First feature. The outlet pipe corresponds to a second silencer pipe 24 in an embodiment of the present invention described later, and the partition corresponds to the first partition 18 in the embodiment.

  According to the present invention, in addition to the first feature, the first body portion is formed so that the length thereof is shorter than the length of the second body portion, and the first body portion corresponding to the first body portion. The second feature is that the first end wall is constituted by a single cup body formed by drawing.

Furthermore, in addition to the first or second feature, the present invention has a third feature that a boss that is burring processed to support the inlet pipe or the outlet pipe is formed on the second body portion. .

  According to the first feature of the present invention, the body is configured by fitting and welding the opposing ends of the first and second body parts divided in the axial direction to each other. While the partition wall is provided, an inlet pipe or an outlet pipe is provided in the first body part, and the inlet pipe or the outlet pipe and the muffler pipe are connected to each other via an L-shaped pipe. Alternatively, one of the outlet pipe and the muffler pipe is welded, and the other end is fitted with the other of the inlet pipe or the outlet pipe and the muffler pipe, so that when the exhaust muffler is assembled, the inlet pipe and the L-shaped pipe, or The fitting position of the L-shaped tube and the muffler tube can be easily adjusted by fine adjustment by slightly shifting the fitting parts of the first and second body parts, and therefore the exhaust muffler is not required to have high accuracy. It can be assembled easily and can contribute to the reduction of manufacturing costs.

In addition, since the inlet tube that communicates with the muffler tube via the L-shaped tube is provided in the first body portion and both ends of the outlet tube are supported by the partition wall and the first end wall, the inlet tube and the outlet tube are the first body portion. In addition to being concentrated on the first end wall, the strength of the first body portion and the first end wall can be increased, and the exhaust gas circulates the entire muffler body, so that the silencing effect can be enhanced.

  According to the second feature of the present invention, the first body is formed such that its length is shorter than the length of the second body, and the first body and the corresponding first end wall Since the cup body is formed by integrally drawing the cup body, the cup body is relatively shallow and can be easily drawn. In addition, since the cup body has high rigidity, it is not necessary to provide a reinforcing member between the two when supporting the inlet pipe on the first body portion, thereby reducing the number of parts and reducing the weight and further reducing the cost. Reduction can be achieved.

According to the third aspect of the present invention, since the support boss that is burring processed to support the inlet pipe or the outlet pipe is formed on the first body portion, the support boss is formed on the first body portion with high accuracy. Therefore, the fitting position of the inlet pipe or outlet pipe supported by the support boss and the L-shaped pipe can be accurately performed .

FIG. 1 is a longitudinal plan view of an engine exhaust muffler according to an embodiment of the present invention (cross-sectional view taken along line 1-1 of FIG. 2). FIG. 2 is a sectional view taken along line 2-2 in FIG. 1. 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. Explanatory drawing of assembly procedure of exhaust muffler. Another assembly point explanatory diagram of the exhaust muffler.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

1 and 2, M is an exhaust muffler for an automobile engine and has a cylindrical shape, and is arranged below the floor of the vehicle body with its axial direction aligned with the vehicle width direction. Muffler body 1 of the exhaust muffler M is composed of a cylindrical body 2 of oval cross section, a first and second end walls 3 and 4 for closing the axial end surfaces of the body 2. The body 2 includes first and second body portions 2a and 2b divided in the axial direction. The length L1 of the first body portion 2a is larger than the length L2 of the second body portion 2b. The first body 2a and the first end wall 3 corresponding to the first body 2a are formed of a single cup body 5 formed by drawing a steel plate. The 2nd trunk | drum 2b is comprised by rounding the steel plate and welding the both end edges which faced each other, and the 2nd end wall 4 fits and is welded to this. And the opposing edge part of the said 1st and 2nd trunk | drum 2a, 2b is mutually fitted and welded.

  A first support boss 6 projecting outward is formed on the side wall of the first body 2a by burring, and an inlet pipe 8 fitted so as to penetrate the first support boss 6 is welded. Is done. A first connection flange 9 is welded to the outer end of the inlet pipe 8, and a second connection flange 10 at the downstream end of an exhaust pipe 11 extending from an engine (not shown) is connected to the first connection flange 9 with a bolt 12. Combined with

  On the other hand, the second body 2b includes first and second partition walls 18 and 19 that partition the inside of the muffler body 1 from the first end wall 3 side into first, second, and third silencing chambers 15 to 17, respectively. The first partition wall 18 is welded at intervals, and the first partition wall 18 has a number of silencer holes 20, 20... (See FIG. 3) communicating between the first and second silencer chambers 15, 16. , A small number of through holes 21, 21... (See FIG. 4) communicating between the second and third silencing chambers 16, 17 are formed.

  The first and second partition walls 18 and 19 are welded with a first silencer pipe 23 penetrating therethrough, and the first silencer pipe 23 has a number of silencer holes 25 and 25 opened to the second silencer chamber 16. ... are drilled. An inner end portion of an L-shaped tube 27 bent toward the first support boss 6 is fitted and welded to one end portion of the first silencer tube 23 on the first silencer chamber 15 side. The other end of the tube 23 opens into the third silencing chamber 17.

  The inner end portion of the inlet tube 8 supported by the first support boss 6 is fitted to the outer end portion of the L-shaped tube 27. The L-shaped tube 27 is composed of a pair of L-shaped tube halves 27a and 27a formed by forming a semi-cylindrical portion 28 bent in an L shape on a steel plate and flanges 29 and 29 protruding from both side edges thereof. These L-shaped pipe halves 27a and 27a are overlapped so that the open surfaces of both the semi-cylindrical portions 28 and 28 are opposed to each other, and both flanges 29 and 29 are welded to each other.

  Thus, the first muffler tube 23 is fitted and welded to the inner peripheral surface of the inner end portion of the L-shaped tube 27, and the inlet pipe 8 is fitted to the inner peripheral surface of the outer end portion. Not done.

  The first partition wall 18 is welded with a second silencer pipe 24 penetrating therethrough, and the outer end portion of the second silencer pipe 24 is formed on the first end wall 3 by burring and protrudes outward. The second support boss 7 is fitted and welded to the inner peripheral surface. An outer cylinder 33 filled with a sound absorbing material 34 is fitted on the outer periphery of the second sound deadening tube 24, and a number of sound deadening holes 35, 35. Has been drilled.

  Next, the operation of this embodiment will be described.

  Exhaust gas discharged from the engine through the exhaust pipe 11 is introduced into the first muffler pipe 23 through the inlet pipe 8 and the L-shaped pipe 27, and the sound waves of the exhaust gas are emitted from the plurality of muffler holes 25, 25 Are attenuated and silenced by being distributed to the second silencing chamber 16. Further, the exhaust gas that has passed through the first silencer 23 is expanded by being discharged into the third silencer chamber 17, and even here, the sound wave is attenuated and silenced.

  The exhaust gas transferred to the third silencing chamber 17 moves to the second silencing chamber 16 while being throttled by a small number of through holes 21, 21... Of the second partition wall 19, and expands again. . Further, the sound wave in the second silencing chamber 16 passes through the many silencing holes 20, 20... Of the first partition wall 18 and is dispersed in the first silencing chamber 15.

  The exhaust gas moved to the second silencing chamber 16 enters the second silencing tube 24, and while passing through the second silencing tube 24, the sound wave is absorbed by the sound absorbing material 34 through the silencing holes 35, 35. Is done. The exhaust gas thus silenced is discharged from the second silencer tube 24 to the atmosphere.

  In assembling such an exhaust muffler M, as shown in FIG. 5, first, the first silencer tube 23 is inserted and welded to the first and second partition walls 18 and 19, and the second partition wall 18 is connected to the second partition wall 18. The silencer 24 is inserted and welded, and the first and second partition walls 18 and 19 are fitted to a fixed position on the inner peripheral surface of the second barrel 2b and welded to the second barrel 2b by a laser. . Next, the L-shaped tube 27 is fitted and welded to the outer end portion of the first muffler tube 23. At this time, the L-shaped tube 27 has its outer end portion assembled in the next step. It arrange | positions so that it may align with the 1st support boss | hub 6 of the part 2a.

  Next, the first body 2 a is fitted into the second body 2 b, the position of the first support boss 6 is aligned with the outer end of the L-shaped tube 27, and the outer end of the second muffler tube 24 is aligned. The second support boss 7 is fitted.

  Next, the inlet pipe 8 is inserted into the first support boss 6, and its inner end is fitted into the outer end of the L-shaped pipe 27. At that time, even if the fitting position of the inlet pipe 8 and the L-shaped pipe 27 is slightly shifted, the fitting is performed by fine adjustment to slightly shift the fitting parts of the first and second body parts 2a and 2b. The position can be easily adjusted. After obtaining the fitting state of the inlet tube 8 and the L-shaped tube 27, the fitting portions of the first and second body portions 2a, 2b are welded, the inlet tube 8 is connected to the first support boss 6, and the second The silencer tube 24 is welded to the second support boss 7 to complete the assembly of the exhaust muffler M. Thus, the exhaust muffler M can be easily assembled without requiring high accuracy, which can contribute to a reduction in manufacturing cost.

  FIG. 6 shows another assembling procedure of the exhaust muffler M. In this case, first, the inlet tube 8 is fitted and welded to the first support boss 6 of the first body 2a, and the L-shaped tube 27 is fitted to the inner end portion of the inlet tube 8 and welded. At this time, the L-shaped tube 27 is arranged so that its inner end is aligned coaxially with the outer end of the first muffler tube 23. On the other hand, the first and second partition walls 18 and 19 to which the first and second muffler tubes 23 and 24 are welded are fitted and welded to the second body 2b. Next, the first and second body portions 2a and 2b are fitted to each other, the inner end portion of the L-shaped tube 27 is fitted to the outer end portion of the first silencer tube 23, and the outer end of the second silencer tube 24 is fitted. The part is fitted to the second support boss 7. At that time, even if the fitting position of the first muffler tube 23 and the L-shaped tube 27 is slightly shifted, the fine adjustment that slightly shifts the fitting portions of the first and second body portions 2a, 2b to each other The fitting position can be easily adjusted. Thereafter, the fitting portions of the first and second body portions 2a and 2b are welded, and the second muffler tube 24 is welded to the second support boss 7 to complete the assembly of the exhaust muffler M. Also in this case, the exhaust muffler M can be easily assembled without requiring high accuracy, which can contribute to a reduction in manufacturing cost.

  In such an exhaust muffler M, the first body 2a is formed such that its length L1 is shorter than the length L2 of the second body 2b, and the first body 2a and the corresponding first body 2a. Since the end wall 3 is constituted by the cup body 5 integrally formed by drawing, the cup body 5 becomes relatively shallow and can be easily drawn. In addition, since the cup body 5 has high rigidity, when the inlet pipe 8 is supported by the first body 2a, there is no need to provide a reinforcing member between them, thereby reducing the number of parts and reducing the weight and cost. Can be further reduced.

  In addition, since the first barrel 2a is formed with the first support boss 6 that supports the inlet pipe 8 and is subjected to burring, the first barrel boss 6 can be formed on the first barrel 2a with high accuracy. Therefore, the fitting position of the inlet pipe 8 and the L-shaped pipe 27 supported by the first support boss 6 can be accurately performed.

  Further, the first body 2a is provided with an inlet pipe 8 that communicates with the first silencer pipe 23 via an L-shaped pipe 27, and a second silencer pipe 24 (outlet pipe) is formed by the first partition wall 18 and the first end wall 3. Thus, the inlet pipe 8 and the second muffler pipe 24 are concentrated on the first body 2a and the first end wall 3, and the strength of the first body 2a and the first end wall 3 is increased. In addition to being able to increase, the exhaust gas circulates the entire muffler body 1, and the noise reduction effect can be enhanced.

  The present invention is not limited to the above embodiment, and various design changes can be made without departing from the scope of the invention. For example, the second muffler tube 24 (outlet tube) can be replaced with an inlet tube, and the inlet tube 8 can be replaced with an outlet tube.

M ... Exhaust muffler 1 ... Muffler body 2 ... Body 2a ... First body 2b ... Second body 3 ... ... 1st end wall 4 ... 2nd end wall 5 ... Cup body 6 ... Support boss (first support boss)
8 ········· Inlet pipes 15 and 16 ·············································
18 ... Bulk (first bulkhead)
23 ... Silencer tube (first silencer tube)
24 ... Exit pipe (second silencer pipe)
27 ... L-shaped tube

Claims (3)

A muffler body (1) composed of a cylindrical body (2), and first and second end walls (3, 4) for closing both axial end surfaces of the body (2), and the muffler body (1) A partition wall (18) that divides the interior into a plurality of silencer chambers (15, 16), a silencer tube (23) supported through the partition wall (18), and a side wall of the body (2), In an exhaust muffler of an engine, comprising an inlet pipe (8 ) supported through it and communicating with the muffler pipe (23),
The body (2) is constructed by fitting and welding the opposing ends of the first and second body parts (2a, 2b) divided in the axial direction to each other, and the second body part (2b). one of the provision of the partition (18), the first body portion (2a) is said first end wall (3) and bottomed cylindrical piece, the inlet pipe (8) provided on the side wall, said inlet The pipe (8 ) and the muffler pipe (23) communicate with each other via an L-shaped pipe (27), and one end of the L-shaped pipe (27) is connected to the inlet pipe (8 ) or the muffler pipe ( 23) is welded to one end, and the other end is fitted to the other of the inlet pipe (8 ) or the muffler pipe (23), and the outlet pipe is formed by the partition wall (18) and the first end wall (3). (24) supporting both ends of the engine , wherein the inlet pipe (8) and the outlet pipe (24) are positioned substantially at right angles . Exhaust muffler. The engine exhaust muffler according to claim 1,
The first body (2a) is formed such that its length (L1) is shorter than the length (L2) of the second body (2b), and the first body (2a), An exhaust muffler for an engine, wherein the corresponding first end wall (3) is constituted by a single cup body (5) formed by drawing. The exhaust muffler of the engine according to claim 1 or 2,
An exhaust muffler for an engine, characterized in that a boss (6) burring processed to support the inlet pipe (8) or the outlet pipe (24) is formed on the first body (2a).

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