JP2001349271A - Spark plug attachment/detachment mechanism for slanted engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily attach/detach a spark plug while maintaining high sound insulating performance of an exhaust muffler. SOLUTION: A recessed portion 30b is formed in a lower wall of the exhaust muffler 24 arranged at the upper side of a cylinder head 4 of the slanted engine to form an attaching/detaching operation space 38 for the spark plug 27. A rocking arm 12 of a centrifugal governor 10 and a throttle arm 15 of a carburetor 7 are interconnected via a connecting member 14. The connecting member 14 is arranged crossing the spark plug 27 near the lower side of a terminal portion 27a of the spark plug 27. The connecting member 14 is used as a mounting guide in mounting a plug attachment/detachment wrench 40 on the spark plug 27.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in an inclined engine, and more particularly to a technique for easily attaching and detaching a spark plug while maintaining a high function of an exhaust muffler.

[0002]

2. Description of the Related Art A tilt engine (E) to which the present invention is applied.
As shown in FIGS. 3 and 4, for example, a swing arm (12) of a centrifugal governor (10) is arranged from an upper surface of a crankcase (1) to an upper surface of an inclined cylinder head (4). An ignition plug (27) is disposed above the head (4), and the output end (12b) of the swing arm (12) and the throttle arm (1) of the carburetor (7).
5) and a connecting member (14), and a fuel tank (23) is arranged above the crankcase (1), and an exhaust muffler (24) is arranged above the inclined cylinder head (4). It is configured.

FIG. 3 is a plan view of a tilt engine.
FIG. 4 shows a state in which the fuel tank (23) and the exhaust muffler (24) have been removed, and FIG. 4 is a front view of the inclined engine. In this inclined engine, a spark plug (2
In the inspection work such as the spark check of 7), in order to easily attach and detach the ignition plug (27), conventionally, it is general to provide a sufficient attachment / detachment operation space above the inclined cylinder head (4). .

[0004]

However, in order to secure a sufficient space for attaching and detaching operation above the inclined cylinder head, the exhaust muffler (24) is moved upward or the exhaust muffler (24) is moved to the side. It must be shifted, which causes the following inconvenience. That is, when the exhaust muffler (24) is moved upward, the height of the inclined engine increases, and when the exhaust muffler (24) is shifted laterally, the exhaust muffler (2) moves toward the power take-out shaft (9) of the inclined engine.
4) appears. Therefore, when the tilt engine is mounted on a working machine or the like, flexibility of mounting is impaired.

Therefore, in order to avoid the above disadvantages,
It is conceivable to reduce the volume of the exhaust muffler,
Then, the noise reduction performance of the exhaust muffler is significantly reduced. The present invention has been made in view of such circumstances, and an object of the present invention is to maintain high silencing performance of an exhaust muffler while facilitating the mounting and dismounting of a spark plug while solving the above-mentioned disadvantages. .

[0006]

In order to solve the above-mentioned problems, a spark plug attaching / detaching mechanism for a tilt engine according to the present invention is configured as follows. That is, according to the first aspect of the present invention, the swing arm (12) of the centrifugal governor (10) is arranged from the upper surface of the crankcase (1) to the upper surface of the inclined cylinder head (4). 4)
A spark plug (27) is arranged on the upper part of the swing arm (12), and an output end (12b) of the swing arm (12) and a throttle arm (15) of the carburetor (7) are interlocked by a connecting member (14). The fuel tank (2) is placed above the crankcase (1).
3) and an exhaust muffler (24) disposed above the inclined cylinder head (4) (hereinafter referred to as a "basic configuration"). Recessed part (30
b) is formed to provide a space (38) for attaching and detaching the ignition plug (27), and the connecting member (14) is located near the lower side of the terminal portion (27a) of the ignition plug (27). 27) and intersect with this connecting member (1).
The plug wrench (40) can be mounted on the ignition plug (27) by using 4) as a mounting guide.

According to a second aspect of the present invention, in the ignition plug attaching / detaching mechanism for an inclined engine according to the first aspect, the connecting member (14) is attached to the governor rod (14a) and the governor rod (14a). And a rod spring (14b) provided so as to be interlockable, wherein the coil part (14c) of the rod spring (14b) is used as a mounting guide for the plug attaching / detaching wrench (40).

[0008]

According to the present invention, the following functions and effects are obtained. (A) According to the first aspect of the present invention, in the inclined engine having the basic configuration, a recessed portion (30b) is formed in a lower wall of the exhaust muffler (24), and a space for mounting and dismounting the ignition plug (27) is provided. 38), the connecting member (14) is arranged near the lower side of the terminal portion (27a) of the spark plug (27) so as to cross the spark plug (27), and the connecting member (14) is used as a mounting guide. Wrench for plug removal (4
Since the exhaust muffler (24) can be attached to the ignition plug (27), the exhaust muffler (24) does not have to be moved upward or to the side, and the exhaust muffler silencing performance is maintained at a high level.

That is, by providing a recess (30b) in the lower wall of the exhaust muffler (24), a space (38) for attaching and detaching the ignition plug (27) is formed, but the recess (30b) is formed. By providing a noise reduction chamber (32a), which is effective for noise reduction, in the lower half of the muffler body (30) described later.
Since (32b) is formed, the silencing performance of the exhaust muffler is maintained high. The connecting member (14) arranged near the lower side of the terminal portion (27a) of the ignition plug (27) so as to intersect with the ignition plug (27) serves as a mounting guide for the plug attaching / detaching wrench (40). Since it functions, the ignition plug (27) can be easily attached and detached. In addition, the space for attachment / detachment operation (38) requires a minimum size.

(B) In the second aspect of the present invention, in the ignition plug attaching / detaching mechanism for the inclined engine according to the first aspect, the connecting member (14) is provided with a governor rod (14).
a) and a rod spring (14b) operably provided along with the governor rod (14a),
The coil portion (14) of the rod spring (14b)
Since c) is used as a mounting guide for the plug wrench (40), when the plug wrench (40) is mounted on the ignition plug (27), the coil portion (14c)
Functions as a cushioning material that also serves as a mounting guide. Thereby, the wrench (40) for plug attachment / detachment is used for the governor rod (14).
a) due to contact with the governor rod (14).
The bending of a) can be prevented beforehand.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows an ignition plug attaching / detaching mechanism applied to an inclined engine. FIG. 1 (A) is a vertical sectional front view of the attaching / detaching mechanism, and FIG. 1 (B) is a vertical sectional right side view of the attaching / detaching mechanism. FIG. 2 is a plan view of the attachment / detachment mechanism.
This shows a state in which the exhaust muffler has been removed.

First, the tilt engine to which the present invention is applied will be described in more detail. As shown in FIGS. 3 and 4, the tilt engine (E) includes a centrifugal governor (1) extending from the upper surface of the crankcase (1) to the upper surfaces of the tilt cylinder block (3) and the tilt cylinder head (4).
0), a speed control lever (11) and a swing arm (12) are arranged, an ignition plug (27) is arranged above the inclined cylinder head (4), and an upper side of the crankcase (1) is arranged. A fuel tank (23), an exhaust muffler (24) above the inclined cylinder head (4), and a fan cover (18) on one side of the crankcase (1). ing.

An exhaust port (6) is formed on the front side of the inclined cylinder head (4).
The exhaust muffler (24) is connected via 6). An intake port (not shown) is formed on the rear side surface of the inclined cylinder head (4), and an air cleaner (17) is connected to the intake port via a carburetor (7). A governor spring (13) is mounted between the governing lever (11) of the centrifugal governor (10) and the swing arm (12), and an output end portion (12) of the swing arm (12) is mounted.
b) and the throttle arm (15) of the carburetor (7) are linked by a linking means (14).

A gear case (2) is provided on the front surface of the crankcase (1), and a power take-off shaft (9) protrudes from the gear case (2). A cover assembling wall (8) is integrally formed on the rear surface of the crankcase (1), and a fan cover (18) is attached thereto. A recoil starter (20) is attached to the fan cover (18), and an igniter and a flywheel fan (not shown) constituting an ignition device are accommodated in the fan cover (18). The ignition high-pressure cord (26) is led out of a cord hole (8a) formed in the cover assembling wall (8).

The ignition high-pressure cord (26) led out from the cover mounting wall (8) of the fan cover (18).
As shown in FIG. 3 and FIG. 4, the speed control lever (11) and the swing arm (12) are bypassed to pass through the space between the crankcase (1) and the fuel tank (23), The tip mounting part (26a) is connected to a spark plug (27) provided on the upper part of the inclined cylinder head (4). This prevents the ignition high-voltage cord (26) from interfering with the governing lever (11) and the swing arm (12), and allows a margin for the wiring size of the ignition plug (27). Inspection work is easy, and the assemblability of the engine is also improved.

A wind guide cover (21) made of a heat-resistant synthetic resin is provided on the upper surface of the inclined cylinder block (3), and a cord clamp (22) is mounted near the upper surface of the wind guide cover (21). The high pressure cord for ignition (26) is supported by the cord clamp (22), so that the high pressure cord for ignition (26) is connected to the swing arm (12).
It is configured to straddle. This is intended to prevent the interference with the swing arm (12) while protecting the ignition high-voltage cord (26) with a wind guide cover (21) and improving its thermal durability. It is.

The exhaust muffler (24) is shown in FIG.
As shown in (B), it is composed of a muffler main body (30) and a protective cover (36) covering the muffler main body (30).
An exhaust duct (16) is connected to the front lower surface of the muffler body (30), and a duct cover (28) is attached to the exhaust duct (16). Further, a muffler tail tube (25) is led out from a front right side surface of the muffler body (30).

The inside of the muffler body (30) is shown in FIG.
As shown in (A), a partition plate (33) is partitioned into an upper expansion chamber (31) and a lower expansion chamber (32), and the partition plate (33) has a large number of throttle holes (35). A tube (34) is provided upright. Further, as shown in FIG. 1B, a space (38) for attaching / detaching the operation of the ignition plug (27) is formed by recessing the lower wall at the center in the front-rear direction of the upper muffler body (30). By providing the recessed portion (30b), the lower expansion chamber (32) is partitioned into two front and rear expansion chambers (32a and 32b), and acts to enhance the noise reduction performance.

The exhaust outlet of the exhaust duct (16) faces the upper expansion chamber (31), and the muffler tail pipe (25)
Of the lower expansion chamber (32) faces the front expansion chamber (32b). The exhaust duct (1
Exhaust gas introduced into the upper expansion chamber (31) through 6) flows into the communication cylinder (34) from the upper throttle hole (35), and flows downward from the lower throttle hole (35). Rear expansion chamber (3
2a), and is discharged from the muffler tail pipe (25) to the atmosphere via the front expansion chamber (32b). During this time, the explosion sound of the engine is effectively silenced.

The protective cover (36) comprises an upper cover (36a) and a lower cover (36b) fixed to the muffler body (30), respectively, and the lower cover (36b).
Cover the lower half of the muffler body (30) with the upper cover (3).
6a) covers the periphery of the muffler body (30) and the lower cover (36b).

Hereinafter, a description will be given of a spark plug attaching / detaching mechanism which is a feature of the present invention. As shown in FIGS. 1A and 1B, the mechanism for attaching and detaching the ignition plug
4) A recess (30b) is formed in the lower wall to form a space (38) for attaching and detaching the ignition plug (27). As shown in FIGS. The connecting member (1) is disposed near the lower side of the terminal portion (27a) of the spark plug (27) so as to cross the spark plug (27).
The plug attaching / detaching wrench (40) is attached to the ignition plug (27) using 4) as an attachment guide. The above configuration is intended to avoid the need to move the exhaust muffler (24) upward or to the side, and to maintain a high noise reduction performance of the exhaust muffler (24).

That is, by recessing the lower wall of the upper muffler main body (30), a space (38) for mounting and dismounting the ignition plug (27) is formed. As described above, the recess (30b) is used. , Two effective silencers (32a) (32b) in the lower half of the muffler body (30).
Is formed, so that the noise reduction performance of the muffler is maintained high.

The connecting member (14) arranged near the lower side of the spark plug (27) and crossing the spark plug (27) functions as a mounting guide for the plug attaching / detaching wrench (40). That is, the wrench (4)
0) is attached to the spark plug (27),
As shown by a virtual line in (A), the connecting member (14)
The tip of the wrench (40) is attached to the terminal (27a) of the spark plug (27) using the as a mounting guide. Next, while raising the wrench (40), the wrench (4) is moved while its rear end side is along the concave portion (30b).
0) with the hexagonal opposite side (27) of the spark plug (27).
b). Next, the wrench (40) is turned with the turning rod (41) to tighten and loosen the ignition plug (27).
Thus, the space for attachment / detachment operation (38) needs to be a minimum size, and the ignition plug (27) can be easily attached / detached.

The connecting member (14) is composed of a governor rod (14a) and a rod spring (14b) provided so as to be interlocked with the governor rod (14a). And the above rod spring (14b)
The coil portion (14c) of the ignition plug (27) is disposed close to the lower side of the terminal portion (27a) of the spark plug (27). This is because the coil part (14c) is connected to the plug wrench (4).
This is for the purpose of the mounting guide 0). According to the above configuration, the plug wrench (40) is connected to the ignition plug (27).
When the coil is mounted on the device, the coil portion (14c) functions as a cushioning material that also functions as a mounting guide.

Thus, the plug wrench (40)
Can prevent the governor rod (14a) from bending due to contact with the governor rod (14a). In this embodiment, the governor rod (14a) is inserted into the coil portion (14c).
0) does not directly contact the governor rod (14a).

[Brief description of the drawings]

1A and 1B show a spark plug attaching / detaching mechanism according to the present invention. FIG. 1A is a vertical sectional front view of the attaching / detaching mechanism, and FIG. 1B is a vertical right side view of the attaching / detaching mechanism.

FIG. 2 is a plan view of the attachment / detachment mechanism, showing a state where an exhaust muffler is removed.

FIG. 3 is a plan view of the tilt engine, showing a state where a fuel tank and an exhaust muffler are removed.

FIG. 4 is a front view of a tilt engine.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Crankcase, 4 ... Inclined cylinder head, 7 ... Vaporizer, 10 ... Centrifugal governor, 12 ... Swing arm, 12b
... the output end of the swing arm, 14 ... the connecting member, 14a ...
Governor rod, 14b: rod spring, 14c: coil part of rod spring, 15: throttle arm, 23: fuel tank, 24: exhaust muffler, 27: ignition plug, 27a: terminal portion of ignition plug, 30b: exhaust muffler Recessed portion of lower wall, 38: space for attaching / detaching operation, 40: wrench for attaching / detaching plug.

Claims (2)

[Claims] 1. A centrifugal governor (1) extending from an upper surface of a crankcase (1) to an upper surface of an inclined cylinder head (4).
0), a spark plug (27) is arranged above the inclined cylinder head (4), and an output end (12b) of the swing arm (12) and a carburetor (12). 7) connecting the throttle arm (15) to the connecting member (1).
4) The tilted engine is constructed by interlocking and connecting the fuel tank (23) above the crankcase (1) and the exhaust muffler (24) above the tilted cylinder head (4). A recess (30b) is formed in a lower wall of the exhaust muffler (24) to form a space (3) for attaching and detaching the ignition plug (27).
8), and the connecting member (14) is connected to the spark plug (2).
7) is disposed near the lower side of the terminal portion (27a) so as to intersect with the ignition plug (27), and the wrench (40) for plug attachment / detachment is used with the connecting member (14) as a mounting guide. A mechanism for mounting and dismounting a spark plug of a tilt engine, wherein the mechanism is configured to be attachable to the engine. 2. The mechanism for attaching and detaching a spark plug of a tilted engine according to claim 1, wherein the connecting member (14) is a governor rod (14a);
A rod spring (14b) provided so as to be interlocked with the governor rod (14a), and a coil part (14c) of the rod spring (14b) is attached to the mounting guide of the plug attaching / detaching wrench (40). A spark plug attachment / detachment mechanism for a tilt engine.