JPH0564409U - Engine muffler - Google Patents

Abstract

(57) [Summary] [Purpose] The two types of muffler whose exhaust directions are forward and reverse are made common, and while maintaining high noise reduction performance, mass productivity is improved and manufacturing cost is reduced. [Structure] An exhaust inlet pipe 3 is connected to a peripheral wall portion 2 of a cylindrical muffler body 1 in the vicinity of the center in the longitudinal direction. The exhaust outlet 5 is opened in each of the end wall portions 4a and 4b at both ends of the muffler main body 1, and the muffler main body 1 has a plurality of stages of exhaust silencing chambers 6a and 6a.
b ... is formed. The exhaust inlet pipe 3 is communicated with the exhaust outlet 3 via the plurality of stages of the exhaust silencing chambers 6a, 6b ... The plurality of exhaust muffler chambers 6a, 6b ... Are formed substantially symmetrically from the central vicinity of the muffler body 1 toward both ends. One of the exhaust outlets 5a and 5b at both ends is closed with a lid 7 to form a structure.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an engine muffler.

[0002]

[Prior Art]

 In the prior art, there is an engine muffler configured as shown in FIG. 2, for example. << Basic Structure >> That is, the exhaust inlet pipe 3 is inserted into the peripheral wall portion 2 of the cylindrical muffler main body 1, and the exhaust outlet 5 is opened in the end wall portion 4 of the main muffler main body 1. Exhaust muffling chambers 6a, 6b ... Are formed. The exhaust inlet pipe 3 is communicated with the exhaust outlet 5 through the exhaust muffler chambers 6a, 6b ... << Specific Structure >> The exhaust inlet pipe 3 is connected to the left half of the peripheral wall portion 2 of the muffler body 1. The exhaust outlet 5 opens to the right end wall portion 4b of the muffler body 1. In the muffler body 1, a primary silencing chamber 6a is formed in the central portion thereof, a secondary silencing chamber 6b is formed in the left half portion around this, and a tertiary silencing chamber 6c is formed in the right half portion.

[0003]

[Problems to be solved by the device]

 The specific structure of the above prior art has the following problems. (A) When mounting the engine on multiple types of machines, depending on the mounting conditions, without changing the mounting state of the muffler to the engine, and when you want the exhaust gas to be discharged from the muffler in the standard positive direction. And sometimes you want to reverse the opposite direction. The normal (right) exhaust muffler and the reverse (left) exhaust muffler in FIG. 2 are the left and right of the outlet positions of the outlet 3a of the exhaust inlet pipe 3 and the primary silencing chamber 6a, and the exhaust outlet 5. It must be manufactured separately because it cannot be shared. (B) In the case of the forward exhaust muffler shown in FIG. 2, exhaust is injected from the exhaust inlet pipe 3 into the wide portion 6e on the right side of the primary silencing chamber 6a. On the other hand, in the case of the reverse exhaust muffler, the exhaust gas is injected into the narrow chamber portion 6f on the opposite side. Therefore, the conditions of injection and flow in the primary silencing chamber 6a of the exhaust gas are largely different between the forward exhaust muffler and the reverse exhaust muffler, so that the silencing performance and the exhaust resistance differ. The present invention makes the forward exhaust muffler and the reverse exhaust muffler common without changing the mounting condition of the engine muffler, and improves the noise reduction performance and the exhaust resistance between the forward exhaust muffler and the reverse exhaust muffler. The challenge is to make sure that there is no difference.

[0004]

[Means for Solving the Problems]

 The present invention is configured as follows in order to achieve the above-mentioned object in the basic structure of the above-mentioned prior art, as shown in FIG. 1, for example. That is, the exhaust inlet pipe 3 is connected to the central portion of the peripheral wall portion 2 of the muffler body 1 in the longitudinal direction. The exhaust outlet 5 opens in each of the end wall portions 4a and 4b at both ends of the muffler body 1. The plurality of exhaust muffler chambers 6a, 6b ... Are formed substantially symmetrically from the central portion of the muffler body 1 toward both ends. One of the exhaust outlets 5a and 5b at both ends is closed with a lid 7 to form a structure.

[0005]

[Operation and effect of the device]

 Since the present invention is configured as described above, it has the following effects and effects. (A) Of the two exhaust outlets 5a and 5b, the exhaust outlet 5a in the reverse direction is closed by the lid 7 and the exhaust outlet 5b in the forward direction is opened, so that the exhaust gas is discharged in the forward direction. You can On the contrary, by closing the forward exhaust outlet 5b with the lid 7 and opening the reverse exhaust outlet 5a, a reverse exhaust muffler can be formed. In this way, by changing the position where the lid 7 is attached, the forward exhaust muffler and the reverse exhaust muffler can be made common without changing the attachment state of the muffler to the engine, and its mass productivity is improved. Manufacturing costs can be reduced. (B) The exhaust gas discharged from the engine flows into the vicinity of the center of the primary silencing chamber 6a, passes through the symmetrical exhaust silencing chambers 6b and 6c in order, and is discharged from the exhaust port 5b in the forward direction. Direction or from the exhaust outlet 5a in the opposite direction. Therefore, the conditions under which the exhaust gas flows in the muffler are almost the same for both the forward exhaust muffler that discharges exhaust gas in the forward direction and the reverse exhaust muffler on the opposite side. There is no difference between the silencing performance and the exhaust resistance, and both high silencing performance and small exhaust resistance can be maintained.

[0006]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. 1A is a cross-sectional view of the muffler of the engine, and FIG. 1B is a cross-sectional view taken along the line XX of FIG. 1A. In the figure, an exhaust gas inlet pipe 3 is connected to a peripheral wall portion 2 of a cylindrical muffler body 1 in the vicinity of the center in the longitudinal direction. The exhaust outlet 5 is opened in each of the end wall portions 4a and 4b at both ends of the muffler main body 1, and a plurality of stages of exhaust muffling chambers 6a, 6b ... Are formed in the muffler main body 1. The exhaust inlet pipe 3 is communicated with the exhaust outlet 5 through the plurality of stages of the exhaust silencing chambers 6a, 6b ... The plurality of exhaust muffler chambers 6a, 6b ... Are formed substantially symmetrically from the central portion of the muffler body 1 toward both ends. One of the exhaust outlets 5a and 5b at both ends is closed with a lid 7, and an exhaust outlet pipe 8 is attached to the other exhaust outlet 5b. The reference numeral 7a represents packing.

[Brief description of drawings]

1 shows an embodiment of the present invention, FIG. 1 (A) is a sectional view of a muffler of an engine, and FIG. 1 (B) is a sectional view taken along the line XX of FIG. 1 (A).

FIG. 2 is a diagram corresponding to FIG. 1 showing a conventional example.

[Explanation of symbols]

1 ... Muffler body, 2 ... Peripheral wall part, 3 ... Exhaust inlet pipe, 4.4
a.4b ... end wall part, 5 ... exhaust outlet, 6.6a.6b ... exhaust silencer, 7 ... lid.

Claims (1)

[Scope of utility model registration request] 1. A muffler body (1) having a cylindrical shape, wherein an exhaust inlet pipe (3) is connected to a peripheral wall (2) and an exhaust outlet (5) is opened in an end wall (4) of the muffler. A plurality of stages of exhaust muffler chambers (6) are formed in the main body (1), and the exhaust inlet pipe (3) is connected to the plurality of stages of exhaust muffler chambers (6a).
In an engine muffler configured to communicate with the exhaust outlet (5) via 6b ...), the exhaust inlet pipe (3) is located near the center in the longitudinal direction of the peripheral wall portion (2) of the muffler body (1). And the exhaust outlet (5) is connected to each end wall of both ends of the muffler body (1).
(4a, 4b), and the exhaust muffling chambers (6a, 6b ...) of the plurality of stages are formed substantially symmetrically from the central vicinity of the muffler body (1) toward both ends, respectively. An engine muffler characterized in that one of the exhaust outlets (5a, 5b) at both ends is closed by a lid (7).