JP4647529B2 - Engine silencer holder and silencer filter using the same - Google Patents

Description

  The present invention relates to a silencer filter holder for an engine that is detachably attached to an outlet side end portion of a tail pipe of a muffler, and a silencer filter using the same.

Conventionally, in general-purpose engines and the like, a technique for attaching a muffler filter to a tail pipe of a muffler is widely known for the purpose of improving the muffling performance. Various proposals have been made for this type of muffler filter. For example, Patent Document 1 discloses a pipe-shaped holder that is detachably inserted into an outlet side end portion of a muffler tail pipe, and the holder. There is disclosed a muffler filter that includes a pair of filter members made of a metal mesh that is fixedly spaced inside.
Japanese Patent Laid-Open No. 7-11931

  By the way, especially in a general-purpose engine, the required silencing performance, output characteristics, and the like are diverse depending on applications, and therefore, it is necessary to prepare various types of silencing filters for a single type of engine. For example, when an engine is used for an application that requires high output, a muffler filter using a relatively thin filter member is attached to the tail pipe in order to reduce exhaust resistance and increase engine output. The On the other hand, when the engine is used for applications that require high quietness, a silence filter using a relatively thick filter member is attached to the tail pipe. Accordingly, a plurality of types of holders are required for holding the various filter members and constituting the muffler filter.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a silencer filter holder for an engine and a silencer filter using the same, which can configure various types of silencer filters with a small number of parts. To do.

  An engine silencing filter holder according to the present invention is an engine silencing filter holder that holds a filter member on an outlet side of a tail pipe of a muffler, and is a first member capable of contacting an outlet side end portion of the tail pipe. A first holder half having a flange portion and a first throttle portion that is formed with a predetermined throttle depth from the first flange portion, and the tail pipe of the first flange portion A second flange portion that can be selectively joined to a surface different from the contact surface; and a second flange portion formed by drawing from the second flange portion with a drawing depth different from that of the first drawing portion. A second holder half having a throttle portion, and selectively joining one surface of the second flange portion to the surface of the first flange portion, thereby Fill between the diaphragm and the second diaphragm With defining the member accommodating chamber, characterized in that fastened integrally with the first flange portion and the second flange portion to the outlet end of the tail pipe.

  The noise reduction filter for an engine according to the present invention is characterized in that a filter member is housed in a filter member housing chamber defined between the first holder half and the second holder half. And

  According to the present invention, various types of muffler filters can be configured with a small number of parts.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The drawings relate to an embodiment of the present invention, FIG. 1 is an exploded perspective view of the muffler filter, FIG. 2 is a perspective view of the muffler filter, and FIG. 3 (a) is a diagram of FIG. It is principal part sectional drawing shown along a line, (b) is principal part sectional drawing which mounts the other muffler filter comprised with the same holder on a muffler, FIG. 4 (a) is the muffler filter of FIG. FIG. 5B is a perspective view showing the main part broken along the line II-II, and FIG. 5A is a perspective view showing the main part of another muffler filter constituted by the same holder. FIG. FIG. 3B is a cross-sectional view showing the holder constituting the muffler filter of FIG. 2 along the line II-II, and FIG. 6B is a cross-sectional view when a filter member housing chamber having a different volume is defined using the same holder; Is a side view of the engine, and FIG. 7 is a front view of the engine.

  6 and 7, reference numeral 1 denotes an engine. In this embodiment, the engine 1 is a single-cylinder four-cycle general-purpose engine that is suitably used for various applications such as a generator, a work machine, and a snowmobile. .

  The engine 1 has a cylinder block 5 in which a crankcase 6 and a cylinder 7 are integrally formed. Here, in order to keep the overall height of the engine 1 low, the cylinder block 5 is formed of a so-called inclined cylinder block in which the cylinder 7 is inclined with respect to the vertical direction of the crankcase 6.

  A crankshaft 10 that is an output shaft of the engine 1 is incorporated in the crankcase 6. Then, both ends of the crankshaft 10 are rotatably supported via a bearing case 8 attached to one side of the crankcase 6 and a bearing (not shown) attached to the other side of the crankcase 6. Has been.

  In the cylinder 7, a piston (none of which is shown) connected to the crankshaft 10 via a connecting rod is slidably accommodated. Further, a cylinder head 11 that accommodates a valve mechanism (not shown) is attached to the upper end of the cylinder 7, and a head cover 12 is attached to the upper end of the cylinder head 11.

  The cylinder head 11 has a suction and exhaust port (not shown) that is opened and closed by a valve mechanism. A fuel tank (not shown) attached to the upper portion of the crankcase 6 via a tank attachment support portion 6 a and an air cleaner 14 attached to the other side portion of the cylinder head 11 are connected to the intake port by a carburetor 15. Connected through. On the other hand, a muffler 17 is connected to an exhaust port of the cylinder head 11 via an exhaust pipe 16.

  The muffler 17 includes a muffler body 17a in which an upper case 18a and a lower case 18b are joined to form a main part, and a muffler cover 17b that covers an upper surface and an outer surface of the muffler body 17a. In the present embodiment, for example, a partition plate 18c in which a plurality of communication ports (not shown) are opened is interposed at a joint portion between the upper case 18a and the lower case 18b. The inside of the muffler main body 17a is partitioned by the partition plate 18c into a first silencing chamber formed on the upper case 18a side and a second silencing chamber formed on the lower case 18b side. Further, the exhaust pipe 16 is connected to the upper case 18a, and the downstream end of the exhaust pipe 16 faces the first silencing chamber. On the other hand, a tail pipe 19 is connected to the lower case 18b, and an upstream end of the tail pipe 19 faces the second silencing chamber. Further, for the purpose of improving the silencing performance of the engine 1 and preventing the occurrence of afterburn etc. of the engine 1, a silencing filter 20 is provided at the downstream end (exit side end) of the tail pipe 19. It is installed.

  As shown in FIG. 1, the silencing filter 20 includes a filter member 21 and a holder 22 that holds the filter member 21 at an end portion on the outlet side of the tail pipe 19 to constitute a main part.

  The filter member 21 is made of, for example, a metal member having a substantially rectangular parallelepiped shape with a predetermined thickness H. Here, the filter member 21 can be formed, for example, by overlapping metal mesh members several times. In this embodiment, in order to obtain a filter member with good air permeability by a simple manufacturing process, the filter member 21 is formed by randomly folding a metal thin wire such as stainless steel in a mold and pressing it with a predetermined pressure. Is formed.

  The holder 22 includes, for example, a first holder half 25 and a second holder half 26 made of a sheet metal member, and a main part is configured.

  The first holder half body 25 includes a first flange portion 30 that can be contacted, and a first throttle portion 31 that is formed by drawing from the first flange portion 30 toward the inside of the tail pipe 19. .

  In this embodiment, the 1st flange part 30 is comprised by the cyclic | annular flange which makes a planar substantially rectangular shape, for example, and the screw hole 30a is drilled in the four corners. And from the center of each edge part of the longitudinal direction of the 1st flange part 30, the strip | belt-shaped latching piece 30b is extended.

  Moreover, the 1st aperture | diaphragm | squeeze part 31 is integrally formed inside the 1st flange part 30 formed in cyclic | annular form. And it has the frame part 31a which can insert the filter member 21 inside, and the flange part 31b which faces inward from the protrusion part of this frame part 31a. In the first throttle part 31, a region surrounded by the flange part 31 b is set as an exhaust port communicating with the tail pipe 19.

  The second holder half 26 has a second flange portion 32 that can be selectively joined to both sides of the first flange portion 30 and a drawing depth shallower than the second flange portion 32. The second aperture portion 33 is provided.

  In this embodiment, the 2nd flange part 32 is comprised by the cyclic | annular flange which makes a planar substantially rectangular shape substantially the same shape as the 1st flange part 30, for example, The four corners respond | correspond to the screw hole 30a. A screw hole 32a is formed. And in the center of each edge part of the longitudinal direction of the 2nd flange part 32, the notch part 32b corresponding to the latching piece 30b is provided.

  Moreover, the 2nd aperture | diaphragm | squeeze part 33 is integrally formed inside the 2nd flange part 32 formed in cyclic | annular form. And it has the frame part 33a which can insert the filter member 21 inside, and the flange part 33b which faces inward from the protrusion part of this frame part 33a. In the second throttle portion 33, a region surrounded by the flange portion 33 b is set as an exhaust port communicating with the tail pipe 19.

  Here, the aperture depths of the first and second aperture portions 31 and 33 (that is, the depths of the frame portions 31a and 33a as viewed from the first and second flange portions 30 and 32) are determined by the filter member 21. It is preferable that the thickness is set on the basis of the thickness. In the present embodiment, for example, with respect to the thickness H of the filter member, the aperture depth of the first aperture section 31 is set to 1.5H, and the aperture depth of the second aperture section 33 is set to 0.5H. Is set. Further, in the present embodiment, the second diaphragm 33 can be superimposed on the inside of the first diaphragm 31.

  Accordingly, as shown in FIGS. 5A and 5B, the first throttle portion 31 and the second throttle portion according to the joint surface of the second flange portion 32 with the first flange portion 30. Two different types of filter member storage chambers 20a or 20b are defined between the two.

  That is, for example, as shown in FIG. 5A, the first holder half body 25 and the second holder half body 26 are arranged in a direction in which the second throttle portion 33 overlaps the inside of the first throttle portion 31. , The holder 22 defines a filter member accommodating chamber 20a having a depth H between the first throttle portion 31 and the second throttle portion 33. In this case, as shown in FIGS. 2 and 4A, a single filter member 21 is accommodated in the filter member accommodating chamber 20a. And the silencing filter 20 is comprised by the latching piece 30b being bent to the 2nd flange part 32 side along the notch part 32b, and engaging with the edge part of the said 2nd flange part 32. As shown in FIG. Further, as shown in FIG. 3A, the first flange portion 30 abuts against the seat plate 19 a of the tail pipe 19. Then, the first and second flange portions 30 and 32 are integrally fastened to the seat plate 19a by the screw members 35 penetrating the screw holes 32a and 30a, so that the silencing filter 20 is attached to the tail pipe 19. Installed.

  On the other hand, for example, as shown in FIG. 5B, the first holder half 25 and the second holder half 26 are arranged in a direction in which the second throttle portion 33 is opposed to the first throttle portion 31. Are joined, the holder 22 defines a filter member housing chamber 20b having a depth of 2H between the first throttle portion 31 and the second throttle portion 33. In this case, as shown in FIG. 4B, two filter members 21 are accommodated in the filter member accommodation chamber 20b in an overlapping manner. Then, the locking piece 30b is bent to the second flange portion 32 side along the notch portion 32b and engaged with the edge portion of the second flange portion 32, thereby using the same holder 22 as described above. A silencing filter 120 different from the silencing filter 20 is configured. Further, as shown in FIG. 3B, the first flange portion 30 is brought into contact with the seat plate 19 a of the tail pipe 19. The first and second flange portions 30 and 32 are integrally fastened to the seat plate 19a by the screw members 35 penetrating the screw holes 32a and 30a, so that the muffler filter 120 is attached to the tail pipe 19. Is done.

  According to such an embodiment, the first holder half 25 having the first flange portion 30 and the first throttle portion 31 that is drawn from the first flange portion 30 with a predetermined drawing depth. A second flange portion 32 that can be selectively joined to a surface different from the contact surface of the first flange portion 31 with the tail pipe 19, and the second flange portion 32 to the first flange portion 31. The holder 22 is configured to include a second holder half 26 having a second throttle part 33 formed with a throttle depth different from that of the throttle part 31. By selectively joining any one surface of the two flange portions 32, a filter member housing chamber 20a or 20b having a different volume is defined between the first throttle portion 31 and the second throttle portion 33. can do. Accordingly, two different types of holders 20 can be configured using one set of holder halves 25 and 26.

  In this case, in particular, the first throttle portion 31 is formed from the first flange portion 30 toward the inside of the tail pipe 19, and the throttle depth is set deeper than the second throttle portion 33. Thereby, the main part of the silence filter 20 (or the silence filter 120) can be efficiently accommodated in the tail pipe 19. Furthermore, the protrusion amount of the muffler filter 20 (or muffler filter 120) from the tail pipe 19 can be efficiently suppressed.

  In addition, by setting the aperture depth of the first aperture section 31 to 1.5 times the aperture depth of the second aperture section 33, two different types of silencer filters 20 using the same type of filter member 21 are used. , 120 can be configured efficiently.

  Further, an engagement piece 30b that is bent toward the second flange portion 32 and is engaged with the edge portion of the second flange portion 32 is provided in the first flange portion 30, and the engagement of the engagement piece 30b is provided. Thus, the first flange portion 30 is joined to the second flange portion 32. Accordingly, the first holder half 25 and the second holder half 26 are joined with a simple configuration without hindering the contact between the seat plate 19a of the tail pipe 19 and the first flange portion 30. be able to.

  Needless to say, the aperture depths of the aperture portions 31 and 33 are not limited to those described above.

  In the above-described embodiment, an example in which each of the first and second holder halves is prepared has been described. However, the present invention is not limited to this, and each of the aperture portions may be provided with various apertures. Needless to say, a plurality of types of first and second holder halves formed at a depth may be prepared and selectively combined.

  In the above-described embodiment, an example in which the first holder half is formed relatively deeper than the second holder half has been described. However, the present invention is not limited to this, for example, Of course, the second holder half may be formed relatively deeper than the first holder half.

Disassembled perspective view of the muffler filter Perspective view of the muffler filter (A) is principal part sectional drawing shown along the II line in the state which attached the muffler filter of FIG. 2 to the muffler, (b) attached other muffler filters comprised with the same holder to a muffler. Sectional view showing (A) is the perspective view which fractures | ruptures and shows the principal part of the silencing filter of FIG. 2 along the II-II line, (b) fractures | ruptures the principal part of the other silencing filter comprised with the same holder. Perspective view (A) is sectional drawing which shows the holder which comprises the muffler filter of FIG. 2 along the II-II line, (b) is a cross section when the filter member accommodation chamber of a different volume is defined using the same holder. Figure Engine side view Front view of the engine

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Engine 17 ... Muffler 17a ... Muffler main body 19 ... Tail pipe 19a ... Seat plate 20 ... Silencer filter 20a ... Filter member accommodation chamber 20b ... Filter member accommodation chamber 21 ... Filter member 22 ... Holder (holder for noise reduction filter)
25 ... 1st holder half body 26 ... 2nd holder half body 30 ... 1st flange part 30b ... Locking piece 31 ... 1st aperture | diaphragm | squeeze part 31a ... Frame part 31b ... Flange part 32 ... 2nd flange part 32b ... Notch 33 ... Second throttle 33a ... Frame 33b ... Flange 120 ... Soundproof filter

Claims (5)

An engine silencer holder for holding a filter member on an outlet side of a tail pipe of a muffler,
A first holder half having a first flange portion, and a first throttle portion drawn from the first flange portion with a predetermined drawing depth;
A second flange portion that can be selectively joined to both sides of the first flange portion; and a second flange portion that is formed by drawing from the second flange portion with a drawing depth different from that of the first drawing portion. A second holder half having
By selectively joining one surface of the second flange portion to the surface of the first flange portion, the filter member is accommodated between the first throttle portion and the second throttle portion. A silencer filter holder for an engine characterized by defining a chamber and integrally fastening the first flange portion and the second flange portion to an outlet side end portion of the tail pipe.   2. The first throttle portion is formed by drawing from the first flange portion toward the inside of the tail pipe, and a depth of the first throttle portion is deeper than that of the second throttle portion. The holder for the silencer filter of the engine.   3. The silencer filter holder for an engine according to claim 2, wherein the aperture depth of the first aperture section is set to 1.5 times the aperture depth of the second aperture section.   The first flange portion has an engagement piece that is bent toward the second flange portion and engages with an edge portion of the second flange portion, and the first flange portion is engaged by the engagement of the engagement piece. The engine silencer filter holder according to any one of claims 1 to 3, wherein the engine silencer filter holder is joined to the second flange portion.   An engine muffler filter comprising a filter member housed in the filter member housing chamber according to any one of claims 1 to 4.

Images