JPS603302Y2 - General-purpose engine muffler cover - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a muffler cover for a general-purpose engine.

Conventionally, screw holes 3 are provided in a muffler 1 of a general-purpose engine as shown in FIG. A constant pitch α0 around the flange 4a of the deflector 4
When attaching the cover to the muffler 1 to which the deflector 4 is attached by aligning the notched U groove (sometimes is a mounting hole) 4b and then screwing the screw 5 into the screw hole 3 through the U groove 4b. As shown in Fig. 3, cover mounting bosses (cover mounting brackets with screw holes may also be used) 6 are fixed on the outer surface of the muffler body 1a at several places by welding, etc., and the muffler is fixed as shown in chain lines in Fig. 3. Fit the cover 7 onto the muffler 1, align the screw insertion holes drilled at the required positions of the muffler cover 7 with the screw holes 6a of the cover mounting boss 6 (sometimes a cover mounting bracket), and then tighten the screws. 8 was screwed to fix the muffler cover 7.

In the case of the muffler 1 with the deflector 4 shown in FIG. 2, the deflector 4 is removed before the muffler cover 7 is fitted, and after the muffler cover 7 is fitted, the muffler cover is removed as shown in FIG. The deflector 4 was fixed by aligning a screw insertion hole 9 drilled at a required position on the front surface of the muffler 7 with a screw hole 3 on the front surface of the muffler 1 and tightening the screw 5.

However, the mounting structure of the muffler cover 7 as described above has the following drawbacks.

(1) Since the muffler 1 has two specifications, one without a cover and one with a cover, when a user etc. needs to attach the muffler cover 7 to the muffler 1 without a cover as shown in Fig. Since the muffler must be replaced with the muffler 1 shown in Fig. 3, the muffler for use without a cover is wasted.

(2) The cover mounting bosses (or cover mounting brackets having screw holes) 6 must be fixedly attached to the outer surface of the muffler body 1a at several locations by welding or the like, which is time consuming and costly.

(3) Since the muffler cover 7 is assembled based on the cover mounting boss (or cover mounting bracket with screw holes) 6 fixed to the outer surface of the muffler body 1a, the muffler 1 is mounted as shown in FIG. The axial center line 1 of the exhaust outlet pipe 10 and the axial center line 1' of the exhaust hole 11 of the muffler cover 7 do not match, and exhaust gas may be drawn into the muffler cover 7.

The present invention was made to eliminate the drawbacks of the conventional muffler cover mounting structure as described above, and it is possible to use the deflector mounting screw hole when necessary in a muffler with a deflector attached. It is easy to install, there is no need to install special muffler cover installation equipment, and in addition, the exhaust outlet pipe of the muffler fits into the exhaust port of the muffler cover to prevent exhaust gas from being drawn into the muffler cover. The purpose of the present invention is to provide a muffler cover for a general-purpose engine that can prevent this.

Hereinafter, an embodiment of the muffler cover for a general-purpose engine according to the present invention will be described with reference to FIGS. 6 and 7. The muffler cover 7' is more powerful than the main body cover 12 and the back cover 12'.

The main body cover 12 has a cylindrical shape with an open rear end surface, and an exhaust port 13 into which the exhaust outlet pipe 10 of the muffler 1 is fitted is formed at the center of the front surface by burring.

On the outside of the exhaust port 13, circular recesses 14 are provided at equiangular positions and correspond to the deflector mounting screw holes 3 drilled in the front surface of the muffler 1. The bottom of the recess 14 is provided with a muffler cover mounting screw insertion hole 15 that matches the deflector mounting screw hole 3.

Further, on the front surface of the main body cover 12, deflector mounting screw holes 16 are provided at positions on the circumference that are shifted α degrees from the respective screw insertion holes 15 with the axial center line of the exhaust port 13 as the center.

Further, a screw insertion hole 17 is provided on the outer peripheral surface of the open rear end of the main body cover 12.

The back cover 12' has a dish-shaped cross section, and a cylindrical edge 12'a on the outer periphery can tightly fit into the open rear end of the main body cover 12, and the cylindrical edge 12'a A screw hole 18 is provided so as to match the screw insertion hole 17.

In addition, a through hole 20 of approximately the same diameter is provided in the center of the back cover 12' so as to coincide with the exhaust gas introduction pipe 19 of the muffler 1, and the exhaust gas introduction pipe 19 of the muffler 1 extends in the vertical direction of the through hole 20. A bolt insertion hole 24 that matches the bolt insertion hole 23 of the flange 22 is provided.

To attach the muffler cover 7' having such a structure to the muffler 1 with the deflector 4 shown in FIG.

Next, as shown in Fig. 7, hold the back cover 12' and insert the muffler 1.
is connected to the engine body 25.

That is, the through hole 20 in the center of the back cover 12' is aligned with the exhaust port 26 of the engine body 25, and the bolt 27 that protrudes from the engine body 25 is passed through the bolt insertion hole 24, so that the back cover 12' is brought into contact with the engine body 25. The exhaust gas introduction pipe 19 of the muffler is aligned with the through hole 2o at the center of the back cover 12' that is in contact with the back cover 12', and the bolt 27 that has passed through the bolt insertion hole 24 is passed through the bolt insertion hole 23 of the flange 22.
A nut 28 is screwed onto the bolt 27 passed through the hole, and the muffler 1 is connected to the engine body 25 by sandwiching the back cover 12'.

Next, the main body cover 12 is placed over the outer periphery of the muffler 1, and the opened rear end is inserted into the cylindrical edge 12'a of the outer periphery of the back cover 12'.
At the same time, the exhaust outlet pipe 10 of the muffler 1 is fitted into the exhaust port 13 on the front side.

Then, align the screw holes 18 provided in the cylindrical edge 12'a of the back cover 12' with the screw insertion holes 17 provided on the outer peripheral surface of the rear end of the main body cover 12, and tighten the screws 5. The deflector mounting screw holes 3 on the front surface of the muffler 1 are aligned with the screw insertion holes 15 provided on the front surface of the main body cover 12, and the main body cover 12 is attached by screwing the screws 5.

As shown in FIG.
The deflector 4 is attached to the main body cover 12 by aligning the required U groove 4b cut out around the flange 4a, and then tightening the screw 5.

At this time, the deflector mounting screw holes 16 provided on the front surface of the main body cover 12 are provided so as to be offset from the screw insertion holes 15 by the same angle as the pitch α0 of the U groove 4b of the deflector 4. 4 can direct the exit in all directions for every α0.

Note that α0 is preferably 30' in terms of design.

As detailed above, the muffler cover of the present invention has a main body force bar with an opening at the rear end, which is installed by diverting the deflector mounting screw holes of a muffler with a deflector, and a rear end opening of the main body cover to be fitted and connected. It consists of a back cover that is clamped and fixed between the flange at the end of the exhaust gas introduction pipe of the muffler and the engine body, so when a muffler cover is required for a muffler with a deflector, it can be easily installed without installing special equipment. The muffler cover can be attached to the muffler, and the exhaust gas introduction pipe, muffler, and exhaust outlet pipe, which become extremely hot, can be reliably protected.

In addition, the front center of the main body cover has an exhaust port into which the muffler's exhaust outlet pipe is fitted when the main body cover is attached to the muffler, so that the exhaust gas is not drawn into the muffler cover. There is.

[Brief explanation of the drawing]

Figures 1 and 2 are perspective views showing the muffler of a general-purpose engine without a muffler cover, and Figure 3 is '? Fig. 4 is a perspective view of the muffler shown in Fig. 2 with a muffler cover attached, Fig. 5 shows the exhaust port of the muffler cover and the muffler exhaust in Fig. 4. Fig. 6 is a cross-sectional view showing the state of misalignment with the outlet pipe, Fig. 6 is a perspective view showing the muffler with the deflector removed and the muffler cover of the present invention is attached, Fig. 7 is the front side of the muffler cover. FIG. 8 is a longitudinal cross-sectional view with the deflector attached, and is a view taken in the direction of arrow A in FIG. 7. DESCRIPTION OF SYMBOLS 1...Muffler, 10...Exhaust outlet pipe, 7'...Muffler cover of this invention, 12...Body cover, 12'...
... Back cover, 12'a... Cylindrical edge, 13... Exhaust port, 14... Recess, 15... Screw insertion hole, 16...
・Screw hole for deflector mounting, 17...Screw insertion hole, 18...Screw hole, 19...Muffler exhaust gas introduction pipe, 20...Through hole, 22...Muffler flange,
23... Bolt insertion hole in the flange, 24... Bolt insertion hole in the back cover.

Claims (1)

[Scope of utility model registration request] A muffler cover has an exhaust port 13 in the center of the front surface into which the exhaust outlet pipe 10 of the muffler 1 fits, and the outer peripheral side of the exhaust port 13 matches the deflector mounting screw hole 3 provided on the front surface of the muffler 1. A cylindrical shape having a mounting screw insertion hole 15, a deflector mounting screw hole 316 at a position on the circumference shifted by an angle α0 from the screw insertion hole 15, and a screw insertion hole 17 on the outer periphery of the rear end opening. a main body cover 12, and a cylindrical edge 12'a having a screw hole 18 that fits into the rear end opening of the main body cover 12 and matches the screw insertion hole 17 on its outer periphery.
on the outer periphery, and the exhaust gas introduction pipe 1 of the muffler 1 in the center.
9 and a back cover 12' having a through hole 20 having approximately the same diameter as that of 9, and a bolt insertion hole 24 that matches the bolt insertion hole 23 of the flange 22 of the exhaust gas introduction pipe 19 of the muffler 1 on the outside of the through hole 20; General-purpose engine muffler cover consisting of: