JP2523498Y2 - Recoil starter mounting structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure of a recoil starter attached to a small internal combustion engine as a manual starter, and more particularly to a mounting structure of a recoil starter which can be easily positioned during assembly.

[0002]

2. Description of the Related Art Conventionally, a recoil starter of a small internal combustion engine (hereinafter, also referred to as an engine), for example, a recoil starter attached to a portable engine used for a brush cutter, is provided on the crankcase side of the engine. A recoil starter mounting seating surface is formed on the mounting surface, and the recoil starter mounting end surface is brought into contact with this seating surface, and the corresponding recoil starter through hole is provided to a mounting hole provided on the crankcase side. By screwing the mounting screws,
Had been attached. Also, the recoil starter is viewed from the front,
That is, it is formed in a circular shape when viewed from the side opposite to the engine in the recoil rotation axis direction. As this kind of prior art, Shokai Sho 62
There is -40272.

[0003]

However, in the mounting structure of the recoil starter having the above-mentioned structure, since the seating surface of the crankcase and the mounting end surface of the recoil starter are both present on the same plane, the screwing is performed. At this time, it is difficult to align the through-hole on the recoil starter side with the mounting hole on the crankcase side, so-called positioning is difficult.

[0004] Furthermore, when the above-mentioned screw is fastened, the recoil starter is formed in a circular shape in a front view.
Since the top and bottom or the left and right cannot be specified, positioning is more difficult.

[0005] By the way, assembling of this kind of engine has been attempted to be automated by a robot, similarly to other engines. However, as described above, the positioning of the recoil starter is difficult due to the difficulty in positioning. At present, attachment cannot be automated by a robot.

SUMMARY OF THE INVENTION The present invention has been made under the above situation, and has as its object to provide a recoil starter mounting structure in which the recoil starter can be easily positioned on the crankcase side.

[0007]

The recoil starter mounting structure according to the first aspect of the present invention provides a recoil starter provided on a side of a crankcase of an engine in a frontal view (as viewed from a side opposite to the engine in a recoil rotation axis direction). While being formed into a mold shape, the engine
Projections formed by the seating surface
Both are provided facing left and right , and the recoil starter is
The mounting end surface has an inner surface that contacts the outer surface of the projection.
Recess formed by a protrusion that protrudes from the
Parts are provided facing at least left and right, and
Attach to the inner surface of the protrusion by touching the convex part of the crankcase
Round chamfers that act as positioning guides when positioning
Characterized by forming

[0008] The recoil starter mounting structure according to the second invention is characterized in that, in the first invention, the upper end surface of the rectangular recoil starter is constituted by an inclined surface which is inclined downward on the side opposite to the engine. .

[0009]

According to the recoil starter mounting structure of the first invention, when the recoil starter is mounted on the crankcase side of the engine, as described above, the mounting of the crankcase seat and the recoil starter is performed. Since the convex portion is formed on one of the end faces and the concave portion is engaged with the other, the positioning can be easily performed by engaging these. In addition, since the recoil starter is of a front-viewing angle type, the position state of the recoil starter can be easily specified vertically and horizontally as compared with a circular shape, so that the positioning becomes easy.

According to the recoil starter mounting structure according to the second invention, the upper portion of the recoil starter can be specified because the upper end surface of the recoil starter is inclined. In this case, positioning becomes easy. Further, as a secondary effect, cooling air discharged from the engine side to the recoil starter side generally has
Although discharged from the vicinity of the upper end of the recoil starter, in such a configuration, compared with the conventional circular case, the rectangular shape increases the portion (area) in contact with the cooling air and increases the exhaust resistance. By forming the upper end surface with an inclined surface inclined downward on the opposite side to the engine side, it is possible to further reduce the exhaust resistance of the cooling air as compared with a conventional circular one.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an overall front view of a small engine according to an embodiment of the present invention, as viewed from a side where a recoil starter is attached.
2 is a partial cross-sectional view of the recoil starter mounting structure as viewed from the direction of the arrow II in FIG. 1, and FIG. 3 is a II-II diagram in FIG. 2 showing a recoil starter mounting surface formed on the crankcase side of the engine. FIG. 4 is a view taken in the direction of the arrow II, FIG. 4 is a view taken in the direction of the arrow III-III in FIG. 2 showing the mounting end face of the recoil starter, and FIG. 5 is a view schematically showing the mounting state in which the recoil starter is mounted on the crankcase side. It is IV-IV arrow sectional drawing.

In FIGS. 1 and 2, 1 is a recoil starter, 2 is a crankcase of the engine E, 3 is an engine cover, and 4 is a tank bracket.

As shown in FIG. 2, a seating surface 2a as shown in FIG. 3 is formed at a portion where the recoil starter 1 is mounted on the side of the crankcase 2 of the engine E. In the present embodiment, the seat surface 2a is formed so as to exist on the same surface of a predetermined height protruding from the periphery to the side opposite to the engine, and has a shape from the front of the seat surface 2a (a shape viewed from a direction orthogonal to the seat surface 2a). ) Is an approximate quadrilateral consisting of a slightly wider edge at the upper part, a side part connected to the upper part, and a narrower part at the lower part as shown by dots in FIG. The screw hole 5 for mounting the recoil starter, in which female threads are threaded on the inner peripheral surface, at the center in the direction and at the lower corners of the quadrilateral.
Are formed.

The mounting end surface 1A of the recoil starter 1 on the crankcase 2 side (engine body side) is shown in FIG.
As shown in FIG. 4 which is a view taken in the direction of arrows III-III, the basic shape corresponding to the shape of the seat surface 2a (see FIG. 3) has a quadrilateral edge. 4, a pressing portion 1a for holding the upper engine cover 3 (see FIGS. 1 and 2), a housing portion 1c for housing and holding the lower tank bracket 4, and a crankcase 2 side. Playing part 1b substantially abutting on the seating surface 2a (accurately, having a very small gap)
Having. A step (see lines 12 and 13 in FIG. 4) is formed at the boundary between the pressing portion 1a and the accommodating portion 1c and the play portion 1b.

As shown in FIG. 5, the recoil starter 1 is positioned on the outer peripheral edges of both sides of the recoil starter 1 in order to position the recoil starter 1 with respect to the crankcase 2. A protruding portion 1B having an inner side surface 1d in contact with the outer side surface 2d is formed. That is,
In this embodiment, as conceptually shown in FIG. 5, a concave portion is formed on the recoil starter 1 side and a convex portion is formed on the crankcase 2 side, so that they are engaged to position the recoil starter on the left and right. Is configured to be easy. Here, the concave portion is the projecting portion 1B located at the outer edge.
And a play portion 1b recessed (retracted) therefrom, and the convex portion is formed by a seating surface 2a protruding from the periphery to the side opposite to the engine. A round chamfer (chamfer) for performing a guiding action is formed at the inner end of the protruding portion 1B.

As shown in FIG. 2, an inclined surface 1D is formed on the upper end surface of the recoil starter 1 on the opposite side to the engine (right side in FIG. 2).

As shown in FIG. 4, the recoil starter 1 has a mounting screw B (FIG. 1) at a position corresponding to the screw hole 5 for mounting the crankcase 2 (see FIG. 3).
) Is formed, and a through hole 6 for passing the
A groove 9 having a rectangular cross section for mounting the tank bracket 4 is formed at both lower end portions.

As shown in FIG. 2, between the seating surface 2a of the crankcase 2 and the pressing portion 1a of the recoil starter 1, there is provided a gap for inserting the engine cover 3 (this embodiment). In this embodiment, a gap (slightly smaller than the plate thickness of the engine cover 3) 10 and a gap (in this embodiment, a gap slightly smaller than the plate thickness of the tank bracket 4) 11 for pressing the tank bracket 4 are formed. .

As shown in FIG. 2, the recoil starter side of the engine cover 3 is in a state where the engine cover 3 is attached to a predetermined position of the engine E body.
It extends so as to be inserted into a gap 10 formed by the seating surface 2a of the crankcase 2 and the pressing portion 1a of the recoil starter 1.

As shown in FIG. 2, a mounting hole 7 for a mounting screw B is formed in a portion of the extended portion corresponding to the through hole 6 (see FIG. 4). I have.

The upper portion 4a of the tank bracket 4, which is bent in an inverted L-shape in FIG. 2, is mounted on a predetermined position of the engine E body as shown in FIG. 2 is extended upward so as to be inserted into a gap 11 formed by the seating surface 2a of the second and the accommodating portion 1c of the recoil starter 1. Then, as shown by a two-dot chain line in FIG. 4, the through hole 6 (FIG.
(See FIG. 1), an attachment hole 8 for a mounting screw B (see FIG. 1) is formed.

The present recoil starter mounting structure constructed as described above operates as follows in positioning during assembly and the like.

That is, at the time of assembling, as shown in FIG. 3, the portion where the engine cover 3 is inserted is indicated by a two-dot chain line on the seat surface 2a of the crankcase 2 in FIG.

At this time, the mounting hole 7 of the engine cover 3 is
Positioning is performed so as to coincide with a screw hole 5 formed in the seating surface 2a of the crankcase 2.

Then, the recoil starter 1 in which the upper portion 4a of the tank bracket 4 is previously mounted in the groove 9 so as to have a predetermined positional relationship is lowered downward on the side opposite to the engine of the recoil starter 1 as shown in FIG. With the inclined surface 1 </ b> D inclined upward, it is placed on the seating surface 2 a of the crankcase 2. At this time, the recoil starter 1 has a protruding portion whose inner surface 1d contacts the outer surface 2d of the crankcase 2 as described above.
Since 1B is formed (see FIG. 5), the left and right positioning of the recoil starter 1 can be easily performed. Further, the recoil starter 1 is formed with a pressing portion 1a, a housing portion 1c, and a play portion 1b, and there is a step between them, so that this step is formed by the engine cover 3 which is superimposed on the crankcase 2. By making the steps coincide with each other, the overall positioning can be easily performed so as to have a predetermined positional relationship.

As a result, the through hole 6 of the recoil starter 1
Correspond exactly with the mounting holes 7 of the engine cover and the mounting holes 8 of the tank bracket 4 and the screw holes 5 formed in the seating surface 2 a of the crankcase 2.

Therefore, in this state, as shown in FIG. 1 or FIG. 2, if the mounting screw B is inserted into the through hole 6 and screwed, the engine cover 3 and the tank bracket 4 are connected to the recoil starter 1. Crankcase 2
Between the seat 2a and the seat surface 2a, and can be firmly fixed.

Also, as described above, the recoil starter 1
As shown in FIG. 2, the flow of the cooling air discharged from the exhaust slit 3a formed in the engine cover 3 is smooth, since the upper end surface is formed by the inclined surface 1D inclined downward on the opposite side to the engine. become.

As described above, according to the recoil starter mounting structure according to the present embodiment, positioning of the recoil starter 1 to the crankcase 2 at a predetermined position in a predetermined state is performed.
It can be done easily.

In the above embodiment, the concave portion is provided on the recoil starter 1 side and the convex portion is provided on the crankcase 2 side for positioning. However, the concave portion is provided on the crankcase 2 side and the convex portion is provided on the recoil starter 1 side. It may be provided on the side.

Further, in the above embodiment, the positioning is performed only in the left-right direction with the concave portion and the convex portion. However, at the same time, the concave portion and the convex portion having the vertical positional relationship are provided, and the vertical positioning is performed. You may comprise.

[0033]

According to the recoil starter mounting structure of the present invention, the recoil starter can be easily positioned on the crankcase side, and the upper part of the recoil starter can be specified. Automation can be promoted.

Further, as a secondary effect, the flow of the cooling air becomes smoother due to the shape of the upper end of the recoil starter, so that the cooling effect is also improved.

[Brief description of the drawings]

FIG. 1 is an overall front view of a small engine according to an embodiment of the present invention as viewed from a recoil starter mounting side.

FIG. 2 is a cross-sectional view taken along the line I- in FIG.
It is a partial sectional view from the direction of arrow I.

3 is a view taken in the direction of arrows II-II in FIG. 2, showing a seat surface for mounting a recoil starter formed on a side of a crankcase of the engine.

FIG. 4 is an II of FIG. 2 showing a mounting end face of a recoil starter.
FIG. 3 is a view taken in the direction of arrows I-III.

FIG. 5 is a cross-sectional view taken along line IV-IV in FIG. 1 conceptually showing an attached state in which a recoil starter is attached to a crankcase side.

[Explanation of symbols]

 1 Recoil starter 1A Mounting end face 1B Projection (recess) 1D Slope 1b Playing part (recess) 2 Crankcase 2a Seat (convex) E Engine

Claims (2)

(57) [Scope of request for utility model registration] 1. A recoil starter provided on a side of a crankcase of an engine is formed in a rectangular shape in a front view, and protrudes from the periphery of the engine to a side opposite to the engine.
At least to the left and right.
The recoil starter is provided confronting the mounting surface of the recoil starter.
A protrusion with an inner surface that contacts the side surface and recessed from it
The recess formed by the play part should be at least
The crankcase is provided with a protrusion on the inner surface of the protrusion.
Contacting the surface to perform the positioning guide action when mounting.
A recoil starter mounting structure characterized by forming a round chamfer . 2. The recoil starter mounting structure according to claim 1, wherein an upper end surface of the rectangular recoil starter is formed by an inclined surface which is inclined downward on the side opposite to the engine.