JP5473965B2 - Air-cooled engine - Google Patents

Description

  The present invention relates to an air-cooled engine, and more specifically, it is possible to suppress a problem that dust such as long mowed grass enters a fan case, and a cut piece of dust such as mowed grass is clogged between outer teeth and a dust barrier. The present invention relates to an air-cooled engine that can suppress problems.

Conventionally, as an air-cooled engine, a cooling fan is accommodated in a fan case, an air suction port is provided in the fan case, a filter plate is attached to the cooling fan, the air suction port is covered with the filter plate, and the fan case There is a type in which a cylindrical dust-proof wall protruding outward is provided, and a plurality of external teeth that rotate along the outer peripheral surface of the dust-proof wall are provided on the filter plate peripheral portion of the filter plate (see, for example, Patent Document 1).
According to this type of air-cooled engine, the air removed from the filter plate is sucked into the fan case from the air suction port, and dust such as mowed grass cut by the mowing blade can be prevented from entering the fan case. Advantages of being able to prevent dust such as mowing grass from entering the fan case along the outer peripheral surface of the dust prevention wall by cutting or jumping off dust such as mowing grass approaching the dust prevention wall with external teeth There is.
However, this conventional technique has a problem because the dust-proof wall is composed of a continuous peripheral wall continuous in the circumferential direction.

Japanese Utility Model Publication No. 53-139434 (see FIGS. 2 and 3)

<Problem 1> Long dust and other dust can easily enter the fan case.
Because the dust barrier is composed of a continuous wall that continues in the circumferential direction, it cannot catch dust such as mowing grass that tries to rotate with the external teeth, and the cutting force due to the rotation of the external teeth is not easily transmitted to the dust, Cutting failure is likely to occur, and dust such as long mowed grass is drawn into the fan case along the outer peripheral surface of the dust barrier, and dust such as long mowed grass tends to enter the fan case. In this case, dust such as long mowed grass clogs the cooling air passage in the fan case or downstream thereof, or on parts (for example, igniter, spark plug, etc.) disposed in the cooling air passage in the fan case or downstream thereof. A problem arises in which the heat dissipation of the components is entangled.

<Problem 2> Cut pieces of dust such as mowing grass tend to be clogged between the external teeth and the dust-proof wall.
Since the dust barrier is a continuous wall that continues in the circumferential direction, the cut piece of dust such as mowing grass cut by external teeth cannot be smoothly released into the fan case, and the cut piece of dust such as mowing grass Tends to be clogged between the external teeth and the dust-proof wall. In this case, a large resistance is applied to the rotation of the external teeth, resulting in an engine output loss.

  An object of the present invention is to suppress a problem that dust such as long mowed grass enters the fan case, and to suppress a problem that a cut piece of dust such as mowed grass is clogged between an external tooth and a dust barrier. The object is to provide an air-cooled engine capable of achieving the above.

Invention specific matters of the invention according to claim 1 are as follows.
As illustrated in FIG. 3 or FIG. 1 (A), the cooling fan (2) is accommodated in the fan case (1), the air inlet (3) is provided in the fan case (1), and the cooling fan (2) is provided. Attach the filter plate (4), cover the air inlet (3) with the filter plate (4), and the cylindrical dust-proof wall (5) projecting outside the fan case (1) at the opening edge of the air inlet (3) And an air-cooled engine having a plurality of external teeth (6) rotating along the outer peripheral surface of the dust-proof wall (5) at the filter plate peripheral portion (4a) of the filter plate (4).
As illustrated in FIG. 1B, the dust-proof wall (5) is composed of a plurality of dust-proof teeth (7) arranged in the circumferential direction, and the dust-proof teeth between the adjacent dust-proof teeth (7) and (7). A gap (8) is provided, and a plurality of internal teeth (9) rotating along the inner peripheral surface of the dust-proof tooth (7) are provided on the filter plate peripheral edge (4a), and the plurality of external teeth (6) and the plurality of external teeth (6) are provided. The internal teeth (9) are all arranged in the circumferential direction of the filter plate peripheral portion (4a),
As illustrated in FIG. 1B, an inter-external tooth gap (10) is provided between adjacent external teeth (6) and (6), and between adjacent internal teeth (9) and (9). The internal dust gap (11) is provided, and the dust (12) passing through the external tooth gap (10), the dust-proof tooth gap (8), and the internal-tooth gap (11) rotates with the dust-proof tooth (7). An air-cooled engine characterized by being cut by external teeth (6) and internal teeth (9).

(Invention of Claim 1)
The invention according to claim 1 has the following effects.
<Effect 1> It is possible to suppress a problem that dust such as long mowed grass enters the fan case.
As illustrated in FIG. 1B, an inter-external tooth gap (10) is provided between adjacent external teeth (6) and (6), and between adjacent internal teeth (9) and (9). The internal dust gap (11) is provided, and the dust (12) passing through the external tooth gap (10), the dust-proof tooth gap (8), and the internal-tooth gap (11) rotates with the dust-proof tooth (7). Since the outer teeth (6) and the inner teeth (9) are cut, the dust (12) such as the mowed grass that tries to rotate with the rotating outer teeth (6) and the inner teeth (9) (7), the cutting force due to the rotation of the internal teeth (6) and external teeth (9) is reliably transmitted to the dust (12), and the failure of cutting the dust (12) is unlikely to occur. The trouble that dust (12) such as long cut grass enters inside can be suppressed.

<Effect 2> It is possible to suppress a problem that a cut piece of dust such as mowing grass is clogged between the external teeth and the dust-proof wall.
As illustrated in FIG. 1 (B), the cut pieces of dust (12) such as mowing grass enter the fan case (1) from the dust-proof inter-tooth gap (8) and the internal inter-tooth gap (11). Can be prevented from clogging between the external teeth (6) and the dust-proof wall (5) (dust-proof teeth (7)).

(Invention of Claim 2)
The invention according to claim 2 has the following effect in addition to the effect of the invention according to claim 1.
<Effect 3> Failure to cut dust is unlikely to occur.
As illustrated in FIG. 1B, the same number of external inter-tooth gaps (10) and internal inter-tooth gaps (11) face each other in the radial direction of the filter plate (4). The dust (12) such as long mowing grass that has penetrated into the inter-tooth gap (10) and the inner inter-tooth gap (11) faces the radial direction of the filter plate (4), and the external teeth (6) The cutting force due to the rotation of the internal teeth (9) is reliably transmitted, and the failure of cutting the dust (12) hardly occurs.

1A and 1B are diagrams illustrating an air-cooled engine according to an embodiment of the present invention, in which FIG. 1A is an enlarged view of a filter plate peripheral portion and its peripheral portion, and FIG. 1B is a cross-sectional view taken along line BB in FIG. FIG. It is a front view of the filter plate used with the air cooling engine which concerns on embodiment of this invention. It is a vertical side view of the air-cooled engine which concerns on embodiment of this invention.

  1 to 3 are views for explaining an air-cooled engine according to an embodiment of the present invention. In this embodiment, a V-type two-cylinder air-cooled spark ignition engine will be described.

  As shown in FIG. 3, this engine includes a cylinder block (14) having a cylinder (16) provided on the upper part of a crankcase (15), and a cylinder head (17) is assembled on the upper part of the cylinder (16). A cylinder head cover (18) is assembled on the top of the head (17). When the cylinder block (14) is viewed from the front, a pair of left and right cylinders (16) protrudes diagonally upward from the left and right from the crankcase (15). A crankshaft (19) is installed in the crankcase (15), the tip of the crankshaft (19) is projected from the crankcase (15), and a flywheel (20) is attached to the tip of the crankshaft (19). The cooling fan (2) is attached to the flywheel (20). A fan case (1) is attached to the front of the cylinder block (14).

As shown in FIG. 3 or FIG. 1 (A), the cooling fan (2) is accommodated in the fan case (1), the air inlet (3) is provided in the fan case (1), and the cooling fan (2) is filtered. Install the plate (4), cover the air inlet (3) with the filter plate (4), and install the cylindrical dust-proof wall (5) protruding outside the fan case (1) at the opening edge of the air inlet (3). A plurality of external teeth (6) rotating along the outer peripheral surface of the dust-proof wall (5) are provided on the filter plate peripheral edge (4a) of the filter plate (4).
The fan case (1) also accommodates a flywheel (20), an igniter (22), an intake manifold (23), and the like.
A cooling air passage (not shown) downstream of the fan case (1) is formed between the pair of left and right cylinders (16) and (16).
As shown in FIG. 2, the filter plate (4) is a punched metal molded product obtained by punching a large number of air suction holes (21). As shown in FIG. 3, the mounting plate (18) is used to attach the cooling fan (2). It is attached.

As shown in FIG. 1 (B), the dust-proof wall (5) is composed of a plurality of dust-proof teeth (7) arranged in the circumferential direction, and between the dust-proof teeth (7) and (7) between the dust-proof teeth. A gap (8) is provided, and a plurality of internal teeth (9) rotating along the inner peripheral surface of the dust-proof tooth (7) are provided on the filter plate peripheral part (4a), and the plurality of external teeth (6) and the plurality of internal teeth The teeth (9) are all arranged in the circumferential direction of the filter plate peripheral edge (4a).
As shown in FIG. 1 (B), a gap (10) between external teeth is provided between adjacent external teeth (6) and (6), and an internal space between adjacent internal teeth (9) and (9) is provided. An interdental gap (11) is provided, and a dust bin (12) passing through the external interdental gap (10), the dustproof interdental gap (8), and the internal interdental gap (11) rotates with the dustproof tooth (7). The outer teeth (6) and the inner teeth (9) are cut.

  As shown in FIG. 1 (B), the same number of external teeth (6) and internal teeth (9) are opposed to each other in the radial direction of the filter plate (4), and the same number of gaps between external teeth (10 ) And the gap (11) between the internal teeth are opposed to each other in the radial direction of the filter plate (4).

(1) Fan case
(2) Cooling fan
(3) Air intake
(4) Filter plate
(4a) Filter plate peripheral edge
(5) Dust barrier
(6) External teeth
(7) Dustproof teeth
(8) Dust-proof tooth gap
(9) Internal teeth
(10) Clearance between external teeth
(11) Internal tooth gap
(12) Garbage

Claims (2)

The cooling fan (2) is accommodated in the fan case (1), the air intake (3) is provided in the fan case (1), the filter plate (4) is attached to the cooling fan (2), and the air intake (3) is installed. A cylindrical dust-proof wall (5) that covers the filter plate (4) and protrudes to the outside of the fan case (1) is provided at the opening edge of the air inlet (3), and the filter plate peripheral edge of the filter plate (4) ( In an air-cooled engine provided with a plurality of external teeth (6) rotating along the outer peripheral surface of the dust-proof wall (5) in 4a),
The dust-proof wall (5) is composed of a plurality of dust-proof teeth (7) arranged in the circumferential direction, and a gap (8) between the dust-proof teeth is provided between adjacent dust-proof teeth (7) and (7). The portion (4a) is provided with a plurality of internal teeth (9) rotating along the inner peripheral surface of the dust-proof tooth (7), and the plurality of external teeth (6) and the plurality of internal teeth (9) are both filter plates. Arranged in the circumferential direction of the peripheral edge (4a),
A gap (10) is provided between the adjacent external teeth (6) and (6), and a gap (11) between the internal teeth is provided between the adjacent internal teeth (9) and (9). The dust bin (12) passing through the interdental gap (10), the dustproof interdental gap (8), and the internal interdental gap (11) is connected to the dustproof tooth (7), the rotating external teeth (6), and the internal teeth (9 ), An air-cooled engine characterized by being cut by. The air-cooled engine according to claim 1,
The same number of external teeth (6) and internal teeth (9) face each other in the radial direction of the filter plate (4), and the same number of external tooth gaps (10) and internal tooth gaps (11) Is an air-cooled engine characterized by being opposed to each other in the radial direction of the filter plate (4).

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