JP7224670B2 - soundproof tamping rammer - Google Patents

Description

TECHNICAL FIELD The present invention relates to a tamping rammer used for compacting ground and road surfaces, and more particularly to a soundproof tamping rammer in which exhaust noise of an engine is reduced by a muffler.

A typical tamping rammer equipped with an engine (internal combustion engine) as a prime mover often has a small simple muffler directly connected to the outer opening of the exhaust port of the cylinder. Since such a small simple muffler does not have a sufficient noise reduction effect, a corresponding exhaust noise is generated when the rammer is in operation. Therefore, when working around residential areas, hospitals, etc., or when working at night, there is a need to use a soundproof rammer configured to reduce exhaust noise as much as possible during operation.

An example of a conventional soundproof rammer is shown in FIG. In this soundproof rammer 50, a large muffler 53 is attached to the lower side of the engine block 52 via a bracket 51 (the bracket 51 attached to the upper part of the housing of the muffler 53 is fixed to the lower part of the engine block 52. installed).

JP 2005-105922 A

Since the tamping rammer generates large vibrations during operation, a structure is adopted in which a muffler 53 is fixed to the lower side of an engine block 52 by means of a bracket 51 arranged in the middle, like the conventional soundproof rammer 50 shown in FIG. In this case, the upper portion of the housing of the muffler 53 (the portion where the bracket 51 is attached) will be heavily loaded, and the housing may become fatigued and damaged due to accumulated operation time. In other words, there is a problem that it is difficult to sufficiently secure the durability of the muffler 53 .

Further, when the muffler 53 is attached to the lower side of the engine block 52, the muffler 53 may be damaged by an external factor such as overturning of the rammer 50 or collision with foreign matter (earth and sand).

Therefore, in order to prevent the muffler from being easily damaged by vibrations and external forces during operation (the rammer overturns, collision with foreign objects, etc.), the muffler selection condition for the conventional soundproof rammer is that the housing must be sufficiently large. It should have sufficient rigidity” was considered. However, in this case, the noise reduction performance, weight, and parts cost may be excessive (overspec) for the displacement of the engine. In other words, even if there is a muffler with more appropriate noise reduction performance, weight, and cost, it cannot be adopted if the rigidity of the housing is insufficient. rice field.

The present invention is intended to solve such problems in the prior art, and can suitably avoid damage to the muffler due to vibrations and external forces during operation of the rammer, and can provide an appropriate muffler suitable for the displacement of the engine. To provide a soundproof tamping rammer capable of adopting a muffler for performance, weight and cost.

A soundproof tamping rammer according to the present invention includes an adapter that covers the upper half of the sound deadening muffler (or the part on the engine side), and the lower half of the sound deadening muffler. The adapter has a protective cover constituted by a bracket that covers the part (or the outer part), and the adapter is configured to be fixed to the underside (or side) of the engine block, and the bracket is attached to the underside (or the outside part) of the adapter ( or outside), and the muffler can be held in a state of being sandwiched between the adapter and the bracket.

In this soundproof tamping rammer, part of the bottom surface of the muffler abuts against a cylindrical spacer placed or fixed on the bottom surface of the bracket, and part of the top surface of the muffler contacts the adapter. It is preferable that the muffler is sandwiched between the adapter and the bracket by coming into contact with the projecting portion projecting downward from the upper surface of the muffler.

In addition, a through-hole is formed in the muffler that penetrates from a portion of the lower surface of the muffler that abuts the spacer to a portion of the upper surface that abuts the protrusion of the adapter, and a through-hole is also formed in the lower surface of the bracket. , the protruding part of the adapter is configured as a screw receiving part, and by inserting the bolt through the through hole of the bracket, the spacer, and the through hole of the muffler, inserting the upper end of the bolt into the screw receiving part of the adapter, and tightening, the adapter , muffler, and bracket can be connected.

In addition, the exhaust inlet is opened on the upper surface of the muffler, and the peripheral edge of the exhaust inlet contacts the flange at the lower end of the exhaust pipe. A through-hole penetrating to a portion abutting on the flange of the muffler is further formed in the muffler, and a corresponding through-hole is also formed in the lower surface portion of the bracket, and the through-hole of the bracket, the spacer, and the muffler The exhaust pipe, the muffler, and the bracket can be connected by inserting a bolt through the through-hole, inserting the upper end of the bolt into a screw hole formed in the flange of the exhaust pipe, and tightening the bolt. preferable.

In addition, it is preferable that the protective cover has a support stay (which covers the upper half of the muffler and is configured so that it can be fixed to the rear side of the adapter), and furthermore, the upper end is attached to the exhaust port of the engine. It is preferably fitted with an integral exhaust pipe which is connected and whose lower end is connected to a muffler.

The soundproof tamping rammer according to the present invention can avoid damage to the muffler due to large vibrations during operation of the rammer, ensure sufficient durability, and can suitably avoid damage to the muffler due to external force.

In addition, the soundproof tamping rammer according to the present invention can be used, for example, even in a muffler whose housing is made of a thin material. It is possible to adopt a muffler that is suitable for the displacement of the engine.

FIG. 1 is a diagram showing the appearance of an engine block 2, a muffler 3, a protective cover 1 for the muffler, an exhaust pipe 4, etc. of a soundproof tamping rammer according to the present invention. FIG. 2 is an explanatory diagram of a method of attaching the protective cover 1 (adapter 11) shown in FIG. FIG. 3 is a perspective view of each component (adapter 11, support stay 21, and bracket 31) of protective cover 1 shown in FIG. FIG. 4 is an explanatory diagram of a method of attaching the protective cover 1 and the muffler 3 shown in FIG. FIG. 5 is a side view of a conventional soundproof rammer 50. FIG.

An embodiment of the "soundproof tamping rammer" of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a diagram showing the appearance of an engine block 2, a muffler 3, a protective cover 1 for the muffler, an exhaust pipe 4, etc. of a soundproof tamping rammer according to the present invention. In this figure, other elements (crank mechanism, legs, operating handle, gasoline tank, etc.) that make up the rammer are omitted. As shown, in this rammer, a muffler 3 is entirely covered by a protective cover 1 and fixed to the underside of an engine block 2 .

The protective cover 1 includes an adapter 11, a support stay 21, and a bracket 31. The upper half of the muffler 3 is covered by the adapter 11 and the support stay 21, and the lower half of the muffler 3 is covered by the bracket 31. part is covered.

As shown in FIG. 2, the adapter 11 includes an upper surface portion 12 parallel to the lower surface of the engine block 2, a front portion 13 extending downward from the front edge of the upper surface portion 12, and both side edges of the upper surface portion 12. and a rib 16 protruding downward from the bottom surface of the top surface portion 12 and having both ends connected and fixed to the inner surfaces of the right side portion 14 and the left side portion 15. It is

As shown in FIG. 2, four bolt insertion holes 12a are formed in the upper surface portion 12 of the adapter 11, and bolts 17 are inserted through the bolt insertion holes 12a from below, respectively, into the engine block. The adapter 11 can be firmly fixed to the lower side of the engine block 2 by inserting it into the bolt receiving portion 2a formed at the bottom of the engine block 2 and tightening it.

As shown in FIG. 3, the support stay 21 includes an upper surface portion 22 having a U-shaped planar shape, a right side portion 24 and a left side portion 25 extending downward from both side edges of the upper surface portion 22, and an upper surface and a rear portion 26 extending downward from the rear edge of portion 22 . Bolt insertion holes 24a and 25a are formed in the right side portion 24 and the left side portion 25, respectively, and nuts are fixed (welded) to the inside thereof.

The support stay 21 is attached and fixed at a position on the rear side of the adapter 11 (the position indicated by the dashed line in FIG. 3). More specifically, the support stay 21 is advanced from the rear side of the adapter 11 to a position between the right side portion 14 and the left side portion 15 of the adapter 11, and the bolt insertion hole of the adapter 11 and the bolt insertion hole 24a of the support stay 21 are inserted. , 25a are aligned, bolts (not shown) are inserted from the outside, and the support stays 21 can be fixed to the adapter 11 by tightening them.

As shown in FIG. 3 , the bracket 31 has a lower surface portion 37 , a front portion 33 extending upward from the front edge of the lower surface portion 37 , and extending upward from both side edges of the lower surface portion 37 . It is composed of a right side portion 34 , a left side portion 35 , and a rear portion 36 extending upward from the rear edge of the lower surface portion 37 . Bolt insertion holes 34a and 35a are formed in the right side portion 34 and the left side portion 35, respectively, and nuts are fixed (welded) to the inside thereof.

The bracket 31 is attached and fixed to a position below the adapter 11 (the position indicated by the dashed line in FIG. 3). More specifically, the bracket 31 is inserted from the lower side of the adapter 11 to a position between the right side portion 14 and the left side portion 15 of the adapter 11, and the bolt insertion holes of the adapter 11 and the bolt insertion holes 34a and 35a of the bracket 31 are inserted. The bracket 31 can be fixed to the adapter 11 by aligning the positions of , inserting bolts (not shown) from the outside, and tightening them.

The muffler 3 is stably held under the engine block 2 (see FIG. 1) while being sandwiched between the adapter 11 and the bracket 31 . More specifically, as shown in FIG. 4, a portion of the lower surface of the muffler 3 abuts against three cylindrical spacers 38a to 38c arranged on the lower surface portion 37 of the bracket 31. A part of the upper surface abuts a projecting portion (screw receiving portion 18) protruding downward from the upper surface portion 12 of the adapter 11, and a peripheral portion of an exhaust inlet (not shown) that opens on the upper surface of the muffler 3. is configured to contact the lower end (flange 4a) of the exhaust pipe 4 and be held firmly.

The muffler 3 has a hole (through hole 3a 3c) are formed, and through holes 37a to 37c are also formed in the lower surface portion 37 of the bracket 31 at corresponding positions (overlapping positions).

Then, the bolt 39a is passed through the through-hole 37a of the bracket 31, the spacer 38a, and the through-hole 3a of the muffler 3 from below, and the upper end of the bolt 39a is inserted into the screw receiving portion 18 of the adapter 11 and tightened, whereby the muffler 3 is are firmly sandwiched between the adapter 11 and the bracket 31, they can be firmly connected and stably held.

Further, the bolts 39b and 39c are passed through the through holes 37b and 37c of the bracket 31, the spacers 38b and 38c, and the through holes 3b and 3c of the muffler 3, respectively, and the upper ends of the bolts 39b and 39c are formed on the flange 4a of the exhaust pipe 4. The exhaust pipe 4, the muffler 3, and the bracket 31 can be firmly connected by inserting them into the screw holes 4b and tightening them. Therefore, damage to the muffler 3 due to large vibrations during operation of the rammer can be avoided, and sufficient durability can be ensured.

Further, the muffler 3 is entirely covered by the adapter 11, the support stay 21, and the bracket 31 even if the rammer falls over or is hit by a foreign object. Damage can be advantageously avoided.

In conventional soundproof rammers, as a condition for muffler selection at the time of design, "the housing must have sufficient rigidity" was considered, so mufflers with excessive noise reduction performance, weight, and parts cost were produced. Although it was sometimes adopted, in the soundproof rammer according to the present invention, as described above, the muffler 3 can be stably held by being sandwiched between the adapter 11 and the bracket 31, and the muffler Since the muffler 3 is entirely covered by the adapter 11 and the like, the muffler 3 can be suitably protected from vibrations and external forces during operation of the rammer. Even a muffler that is present can be adopted. As a result, it is possible to adopt a muffler that is appropriate in terms of noise reduction performance, weight, and cost (matching the displacement of the engine).

Furthermore, in the conventional soundproof rammer, the exhaust port of the engine (cylinder) and the muffler were connected by a two-piece exhaust pipe, but in the soundproof rammer of the present invention, as shown in FIGS. As shown, an integrated type exhaust pipe 4 (the upper end is connected to the exhaust port and the lower end is connected to the muffler 3) is adopted, which can reduce the number of fastening points and can be expected to improve strength. can. In addition, by utilizing the elasticity of the exhaust pipe 4, an effect can be expected that the fixing and holding of the muffler 3 can be assisted.

In the above embodiment, the spacers 38a to 38c are configured to be placed on the lower surface portion 37 of the bracket 31 (configured as members independent of the bracket 31). It can also be configured integrally with the bracket 31 by fixing (welding) it onto the lower surface portion 37 of the bracket 31 in advance.

Further, in the above embodiment, the muffler 3 is fixed to the lower side of the engine block 2 while being covered with the protective cover 1. rear side) can also be adopted. In this case, the protective cover 1 and the muffler 3 are preferably fixed to the engine block 2 in a posture rotated by about 90° from the posture shown in FIG. the left side, the front side, or the rear side), the bracket 31 is fixed to the outside of the adapter 11, and the engine side portion of the muffler 3 is connected to the adapter 11 and the support stay. 21 , and the outer portion of the muffler 3 is covered by the bracket 31 .

1: protective cover,
2: engine block,
2a: bolt receiving portion,
3: muffler,
3a to 3c: through holes,
4: exhaust pipe,
4a: flange,
4b: screw hole,
11: Adapter,
12: upper surface,
12a: bolt insertion hole,
13: front part,
14: right side,
15: left side,
16: ribs,
17: bolt,
18: screw receiving portion,
21: support stay,
22: upper surface,
24: right side,
24a: bolt insertion hole,
25: left side,
25a: bolt insertion hole,
26: Rear part,
31: bracket,
33: Front part,
34: right side,
34a: bolt insertion hole,
35: left side,
35a: bolt insertion hole,
36: Rear part,
37: lower surface part,
37a-37c: through holes,
38a-38c: spacers,
39a-39c: bolts,
50: soundproof rammer,
51: bracket,
52: engine block,
53: Silent muffler

Claims (7)

A soundproof tamping rammer with a muffler fixed to the underside of the engine block,
Having a protective cover composed of an adapter covering the upper half of the muffler and a bracket covering the lower half of the muffler,
The adapter is configured to be secured to the underside of the engine block,
A bracket is configured to be secured to the underside of the adapter,
A soundproof tamping rammer characterized in that it is constructed so as to hold a sound deadening muffler sandwiched between an adapter and a bracket. A part of the lower surface of the muffler abuts a cylindrical spacer placed or fixed on the lower surface of the bracket, and a part of the upper surface of the muffler protrudes downward from the upper surface of the adapter. 2. A soundproof tamping rammer according to claim 1, characterized in that a sound deadening muffler is sandwiched between the adapter and the bracket by contacting the projection. A through-hole is formed in the muffler that penetrates from a portion of the lower surface of the muffler that contacts the spacer to a portion of the upper surface that contacts the protrusion of the adapter, and a through-hole is also formed in the lower surface of the bracket,
The protruding part of the adapter is configured as a screw receiving part,
The adapter, muffler, and bracket can be connected by inserting the bolt through the through hole of the bracket, the spacer, and the through hole of the muffler, inserting the upper end of the bolt into the screw receiving part of the adapter, and tightening it. A soundproof tamping rammer according to claim 2, characterized in that An exhaust inlet is opened on the upper surface of the muffler, and a peripheral edge of the exhaust inlet is in contact with a flange at the lower end of the exhaust pipe,
A through-hole is further formed in the muffler that penetrates from the portion of the lower surface of the muffler that abuts the spacer to the portion of the upper surface that abuts the flange at the lower end of the exhaust pipe, and the through-hole corresponding to the lower surface of the bracket. is formed and
The exhaust pipe, the muffler, the exhaust pipe, the muffler, the exhaust pipe, the muffler, 4. The soundproof tamping rammer according to claim 3, characterized in that it is constructed so that the bracket can be connected. The soundproofing according to any one of claims 1 to 4, wherein the protective cover has a support stay configured to cover the upper half of the muffler and to be fixed to the rear side of the adapter. type tamping rammer. The soundproof tamping rammer according to any one of claims 1 to 5, characterized in that an integrated exhaust pipe is attached whose upper end is connected to the exhaust port of the engine and whose lower end is connected to a muffler. A soundproof tamping rammer with a muffler fixed to the side of the engine block,
a protective cover composed of an adapter that covers the engine-side portion of the muffler and a bracket that covers the outside of the muffler;
an adapter configured to be secured to the side of the engine;
A bracket is configured to be secured to the outside of the adapter,
A soundproof tamping rammer characterized in that it is constructed so as to hold a sound deadening muffler sandwiched between an adapter and a bracket.

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