JP2564419Y2 - Engine cooling air inlet - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling air inlet for an engine.

[0002]

2. Description of the Related Art A cooling air intake hole of a general-purpose two-stroke engine used in a conventional brush cutter will be described with reference to FIGS. In the figure, 1 is a cylinder, 2 is a piston, 3 is a spark plug, 4 is a crankcase, 4A is a crankcase 4
Are the first casing and 4B are the second casing of the crankcase 4 and 5 are the first casing 4A and the second casing 4
The mating surfaces 6A and 6B of B are the side walls of the first casing 4A and the second casing 4B, 7A and 7B are the bearing support portions provided at the center of the side walls 6A and 6B, and 8 and 8 are the bearing support portions 7.
A, bearings supported by 7B, 9 is a crankpin, 1
Reference numeral 0 denotes a crankshaft, 11 denotes a bowl-shaped fan case formed integrally with the crankcase 4, wherein the piston 2 and the crankshaft 10 are connected via a crankpin 9, and the crankshaft 10 is rotatable by bearings 8,8. The crankshaft 10 is supported, and one end of the crankshaft 10 projects into the bowl-shaped fan case 11.

[0003] Reference numeral 12 denotes a cooling fan mounted on the tip of the crankshaft 10, 13 a drive-side clutch mounted outside the cooling fan 12, 14 a coil supported by the cylinder 1, and 15 an outer periphery of the cooling fan 12. A magnetic pole portion attached to the portion (opposite portion of the coil 14), 16 is an engine driving ring gear provided on the outer peripheral portion of the cooling fan, 17 is a fan cover that surrounds the cooling fan 12 in cooperation with the bowl-shaped fan case 11, and 18 is a bowl. Cooling air suction holes provided at three places of an imaginary circle centered on the crankshaft 10 at the base of the fan-shaped fan case 11 on the side of the crankcase 4 (first casing 4A). With the stationary blades, the cooling fan 12 is rotated by the crankshaft 10 and the outside air is sucked into the fan cover 17 from each cooling air suction hole 18. Both are discharged in the direction of the cylinder 1 is adapted to cool the cylinder 1. In addition, 2
Reference numeral 0 denotes a mating surface between the cylinder 1 and the crankcase 4.

[0004]

In a conventional engine, the machining accuracy of the contact surface 5 between the first casing 4A and the second casing 4B and the hole for fitting the bearing 8 must be high. However, in order to increase the processing accuracy, it is necessary to clamp the first casing 4A at a position close to the processing portion at the time of processing. However, since the stationary vane 19 is provided at an appropriate position in the conventional clamp, the Since there is a possibility that the stationary blade 19 near the stationary blade portion may be cracked, there is a problem that the clamp cannot be performed near the processed portion.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the conventional apparatus, and to provide a high-accuracy machining machine without cracks on a stationary blade close to a clamp point during machining, and to simplify the machining equipment and reduce the production cost of an engine. Providing an air inlet.

[0006]

The cooling air intake hole of the engine according to the present invention has a fan case integrally formed on one side of the crankcase and a cooling air intake hole formed on the side of the fan case on the crankcase side. A resin lattice member provided with a stationary vane (45a) for preventing intrusion of foreign matter from the air suction hole in an engine provided with a cooling fan mounted on a crankshaft protruding into the fan case. 45) is mounted so as to close the opening provided near the machining clamp seat.

[0007]

The first casing 4 is constructed as described above.
There is no need to restrict the processing equipment of A, and the production capacity and processing accuracy can be improved at low cost.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a view showing a first casing 40 of the present invention, which is a part corresponding to the first casing 4A of FIG. 8, and the projection direction is the same as that of FIG. In FIG. 1, 41 is a bearing support corresponding to 7a in FIG. 8, 42 is a fan case corresponding to 11 in FIG. 8, and 43 is 1 in FIGS.
The stationary blades corresponding to No. 9 and 44A, 44b and 44c are shown in FIGS.
The cooling air suction hole 41a corresponding to 18 of FIG.
A contact surface 41b corresponding to the contact surface 5 between the casing 4A and the second casing 4B, a contact surface 41b with the lower part of the cylinder 1 corresponding to the surface 20 in FIG. 8, and 41c fitted with the bearing 8 in FIG. The bearing hole 41d corresponding to the hole to be formed is a fitting hole for the oil seal.

In FIG. 1, positions 41e, 41e, 41f marked with *
Indicates the position of the clamp seat when the surface (41b, 41c, 41d) is machined. 2 is a cross-sectional view taken along line AA passing through the center of the stationary blade 43, FIG. 4 is a cross-sectional view taken along line CC passing through the clamp seat 41e, and FIG. 3 is a cross-sectional view taken along line BB passing through a machining hole adjacent to the clamp seat 41e. The figure is shown. 2 in FIG.
The parts indicated by dotted lines are grids 45 made of a resin grid such as PP or PE, FIG. 5 is a plan view thereof, FIG. 6 is a cross-sectional view taken along line D-D of FIG. 5, and FIG. Show.

5 to 7, a grid 45 is formed by connecting upper and lower plates 45b and lower plates 45c to upper and lower surfaces of a plurality of stationary blades 45a, and a claw 45d is formed on the lower surface of the lower plate 45c.
That is, as described above, many of the vanes (43) formed on the side surface of the fan case around the cooling fan 12 are divided into three ranges, and the crankcase of the cooling air intake hole 44b is located close to the clamp seat when machining. A large opening is formed in the portion where the lattice 45 is fitted with a resin-made vane 45a.

Next, the operation of the above embodiment will be described.
When the engine rotates, the cooling fan 12 also rotates, and outside air is drawn in from the cooling air suction holes 44a, 44b, 44c,
After cooling the cylinder 1, it is discharged outside the engine. The cooling air suction hole 44b is exposed to the outside so that a person does not injure him by putting his finger, or when this engine is mounted on a brush cutter or the like, foreign matter such as leaves of a tree or cutting off a branch may enter the engine. The stationary blade 43 is formed integrally with the fan case 40 so as not to be sucked. Cooling air suction hole 44a
Is also exposed to the outside, so that the cooling air holes 44
It is necessary to measure the inflow of foreign matter as in the case of b. However, due to the necessity of processing, the conventional stationary blade 43 is removed, and the clamp seat 4 during processing is removed.
1e, a cooling air suction hole 44a having a large cross-sectional area is opened in the vicinity of 1e, and a resin grid 45 is mounted after processing.

As shown in FIG. 3, the grid 45 is mounted by inserting the upper end of the grid into the lower surface of the upper flange of the bearing support 41, and then rotating the grid 45 in the direction of arrow D '. Then, the grid 45 is elastically deformed while the claws 45
d is engaged with the inner edge of the fan case 42 and falls in the normal position shown by the two-dot chain line, and is restored to the original correct shape. The grid does not need to be removed thereafter. Cooling air suction hole 44c
Since is covered by a cover (not shown), it is not necessary to protect the holes as described above. However, a stationary blade 43 is provided as a stay for increasing the rigidity of the bearing support portion 41.

[0013]

[Effect of the Invention] Since the present invention is configured as described above, the processing equipment is simplified, the production efficiency is increased, the processing accuracy of the product is improved, and the production cost is reduced. In addition, since a resin lattice is inserted in the stationary blade portion near the clamp point,
Just like the conventional casing, safety regulations are satisfied and foreign matter intrusion is prevented, and the resin grid helps reduce the weight of the engine.

[Brief description of the drawings]

FIG. 1 is a front view of a first casing according to an embodiment of the present invention;

FIG. 2 is a sectional view taken along line AA of FIG. 1;

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is a sectional view taken along the line CC of FIG. 1;

FIG. 5 is a plan view of a lattice.

FIG. 6 is a sectional view taken along line DD of FIG. 5;

FIG. 7 is a perspective view of a lattice.

FIG. 8 is a longitudinal sectional view of a conventional engine.

FIG. 9 is a sectional view taken along line EE of FIG. 8;

[Explanation of symbols]

11 ... crankshaft, 12 ... cooling fan, 40 ...
Crank case (first casing), 42: fan case, 43: stationary blade, 45: lattice, 45a: stationary blade, 44a,
44b, 44c: Cooling air suction holes.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoshio Kobayashi 1 Nagoya Equipment Works, Iwazuka-cho, Nakamura-ku, Nagoya-shi, Aichi Prefecture Mitsubishi Heavy Industries, Ltd. Nagoya Kiki Seisakusho, Mitsubishi Heavy Industries, Ltd.

Claims (1)

(57) [Scope of request for utility model registration] 1. A fan case is integrally formed on one side of a crankcase, a cooling air intake hole is formed on a side of the fan case on the side of the crankcase, and further mounted on a crankshaft protruding into the fan case. In an engine equipped with a cooling fan, resin-made resin blades (45a) for preventing entry of foreign matter from the air suction holes are provided.
A grid member (45) is provided near the machining clamp seat.
A cooling air intake hole for an engine, which is installed so as to close the opening .