JPH0210299Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a recoil starter for starting an engine, and particularly relates to a recoil starter for a small engine that is capable of cooling the components of the recoil starter.

In general, a recoil starter for starting a small engine has a flywheel that also serves as a cooling fan attached to a crankshaft that protrudes from the side of the crankcase, and a starting shaft that is arranged to face the end of the crankshaft. A reel is attached to the crankshaft, a starting rope is wound around this reel, the starting rope is pulled from the outside to rotate the reel, and the torque is applied to the starting pulley attached to the end of the crankshaft. The signal is transmitted to the crankshaft through the engine, forcing the piston to reciprocate and start the engine.

By the way, in the recoil starter constructed as described above, a flywheel which also serves as a cooling fan is disposed nearby, and cooling air is sucked by the rotation of the flywheel, so that components of the recoil starter, especially resin etc. The reel or starting rope made of the material is sufficiently cooled, and there are few problems caused by insufficient cooling.

However, especially when the engine and generator are directly connected and a flywheel that also serves as a cooling fan is mounted between them, such as in an engine-driven generator, or the flywheel that also serves as a cooling fan is structurally separated. When it is necessary to install a recoil starter independently,
Heat from the engine or generator was transmitted, causing adverse thermal effects such as deterioration of the reel and starting rope.

Furthermore, when a large number of ventilation holes are provided on the side periphery of the recoil starter case in order to improve ventilation, water, dust, etc. can easily enter through these holes, so that the water, dust, etc. There have been many cases in which the particles adhere to the starting rope or the recoil spring for rewinding the rope, resulting in a decrease in their function.

In addition, Utility Model Application Publication No. 132508 and Utility Model Application No. 53-
Japanese Patent Publication No. 133011 proposes a conventional technique relating to a power generation device in which an engine and a generator are integrally connected and a recoil starter for starting the engine is provided at the end on the generator side.

However, in both of these conventional technologies, the recoil starter is placed separately and separated from the flywheel that also serves as a cooling fan, and heat is transmitted from the generator, resulting in adverse thermal effects, and there is a gap in the case of the recoil starter. This makes it easy for water or dust to enter.

Furthermore, in Japanese Utility Model Publication No. 55-18505, ventilation holes and auxiliary ventilation blades are provided on the peripheral wall of the starting pulley,
2. Description of the Related Art A forced air blower for an engine is known that uses a fan that also serves as a flywheel to increase the amount of cooling air. However, in this conventional example, the auxiliary blower blade of the starting pulley is installed in front of the fan that also serves as the flywheel, and the cooling air volume is increased by the cooperation of the two.However, it is not possible to cool the recoil starter with the flywheel fan. , or cannot be applied to items that are difficult to cool.

This invention was made in view of the above circumstances,
This allows outside air to be sucked into the case of the recoil starter, which is installed in the engine crankcase, to suppress temperature rises, prevent deterioration of heat-sensitive resin parts that make up the recoil starter, and prevent the inside of the recoil starter case from deteriorating. It is an object of the present invention to provide a recoil starter for a small engine that can reduce the chances of water or dust entering the engine, prevent the functionality of the component parts from deteriorating, and further reduce manufacturing costs.

In order to achieve the above object, the present invention includes a starting shaft that is provided to transmit torque via a starting pulley that is mounted on the protruding end of the crankshaft, a reel that is mounted on the starting shaft, and a reel that is mounted on the starting shaft. A recoil starter consisting of a starting rope wound around a reel, and a case covering the starting pulley, starting shaft, and reel, and the recoil starter cannot be cooled by outside air sucked in by a flywheel that also serves as a cooling fan. In cases where it is difficult to cool the starter pulley, the starting pulley is provided with blades for sucking outside air, and the blades are used to suck outside air into the case to cool the recoil starter component. , and a discharge hole for discharging cooled outside air to the outside of the case.

Embodiments of the present invention will be described in detail below with reference to the drawings.

1 to 7 relate to an embodiment of the present invention,
Fig. 1 is a front view of the recoil starter, Fig. 2 is a rear view of Fig. 1, Fig. 3 is a view showing arrow B in Fig. 2, and Fig. 4 is an enlarged cross section taken along line A-A in Fig. 1. Figure, 5th
The figure is a front view of the starting pulley, and Figure 6 is C- in Figure 5.
7 is a sectional view taken along line C--D in FIG. 5. FIG.

In these figures, numeral 1 is a crankshaft, 2 is a crankcase, and the protruding end of the crankshaft 1 has a
A starting pulley 3 is pivoted. The recoil starter covers the starting shaft 4, the reel 5 attached to the starting shaft 4, the starting rope 6 wound around the reel 5, the starting pulley 3, the starting shaft 4, the reel 5, etc. It consists of case 7 etc.
Torque can be transmitted to the starting pulley 3 when starting the engine.

The starting shaft 4 has the same axis as the crankshaft 1, and is disposed with one end fixed to the end surface of the front case 7 so as to face the end of the crankshaft 1. The reel 5 is rotatably attached to the starting shaft 4. The reel 5 is made of a material such as resin, and a groove is formed on the side circumference of the reel 5. A starting rope 6 made of a material such as resin and having one end fixed to the reel 5 is wound around this groove. The other end of the starting rope 6 is pulled out from the side surface of the case 7 and fixed and connected to the handle 8. A recoil spring 9 is disposed on the front side of the reel 5, and one end of the recoil spring 9 is fixed to the reel 5 and the other end to the case 7. That is, the recoil spring 9 is for applying a restoring force to return the reel 5 to its original position after the reel 5 is rotated by pulling the starting rope 6 in order to start the engine. On the other hand, on the back side of the reel 5, there is a ratchet pawl 10 pivoted to a shaft fixed to the end face of the reel 5, and when the starting rope 6 is pulled and the reel 5 is rotated, the ratchet pawl 10 is raised. A coil spring 11 is provided.

The starting pulley 3 is made of sheet metal, etc., and has a substantially cylindrical shape with an opening at one end of the front surface, a bent part 12 bent outward at the opening, and a protruding end of the crankshaft 1 at the other end. A recess 13 is formed to fit into the recess 13 . Then, the bent portion 1 of this starting pulley 3
A plurality of engagement holes 14, . A plurality of wings 15, . . . that protrude from each other are formed. As shown in FIG. 7, the blades 15 have a mountain-shaped shape with one side substantially vertical and the other side gently sloping, so that cooling air can be blown by rotation of the starting pulley 3. . or,
The case 7 consists of a recoil starter case 16 and a coil starter bracket 17, and is configured to cover components such as the starting pulley 3, starting shaft 4, and reel 5. The recoil starter case 16 has a substantially cylindrical shape with an opening at one end on the rear side and a flange 18 formed in the opening. An opening is formed in the center of the front side of the case 16, and one end of the starting shaft 4 is fitted and fixed in this opening.
On the other hand, the recoil starter bracket 17 is made of a substantially circular plate material, and has a circular hole 19 in the center portion having a size approximately the same as the diameter of the side circumferential portion of the starting pulley 3, and a rear surface in the portion excluding the left, right, and lower portions of the center. Mounting parts protruding to the side (upper mounting part 20, lower mounting part 2
1, 21), and a protruding part 22 protruding somewhat lower than the mounting part is formed on the lower side. and,
The recoil starter bracket 17 is attached to the mounting portion 2.
0, 21, 21 are in contact with the crank case 2 and fixed with bolts, and the recoil starter case 16
The flange portion 18 of the case 16 is brought into contact with the peripheral edge of the recoil starter bracket 17 and fastened with bolts and nuts. That is, the recoil starter case 16 and the recoil starter bracket 17 are fastened to form the case 7, and the case 7 has suction holes 23, 23 as ventilation holes for cooling air in the left and right direction and below the recoil starter bracket 17. , 23, a discharge hole 24 is formed from the protrusion 22 and the flange 18.

In the recoil starter for a small engine constructed in this manner, in order to start the engine, the user holds the handle 8 and pulls the starting rope 6, thereby rotating the reel 5 and raising the ratchet pawl 10. Due to the engagement between the ratchet pawl 10 and the engagement hole 14, the rotation of the reel 5 is transmitted to the crankshaft 1 via the starting pulley 3, causing a piston (not shown) to reciprocate and start the engine.

On the other hand, once the engine has started, when the tensile force applied to the starting rope 6 is released, the reel 5 rotates in the opposite direction due to the restoring force of the recoil spring 9, and the ratchet pawl 10 disengages from the engagement hole 14. As a result, the engagement between the reel 5 side and the crankshaft 1 side is released. When the engine is started by the above operation, as the starting pulley 3 rotates, the blades 15 formed on the pulley 3 blow the cooling air to the suction hole 2 as shown in the flows a and b shown in FIG.
3, 23, 23, and cools the reel 5, starting rope 6, and other components in the case 7, and c
It is discharged from the discharge hole 24 like the flow of. or,
Suction holes 23, 23, 23 as ventilation holes for cooling air
The discharge holes 24 are formed in the narrow portions between the crankcase 2 and the recoil starter bracket 17, and are formed on the left, right, and lower sides, so that water or dust is unlikely to enter, and the starting rope 6, recoil spring 9, etc. The function of the component parts will not be deteriorated.

Incidentally, in the above embodiment, a protrusion is formed on the side circumference of the starting pulley 3 to provide the wings, but the blades are not limited to this, and may be provided on the inner circumference or the like. It may also be one in which plate materials are welded together. Furthermore, the shape of the recoil starter case is not limited to the shape of the embodiment. That is, it is sufficient that the ventilation holes are formed on the left and right sides or lower side of the case and crankcase. moreover,
The ratchet pawl can also be applied to a structure that is raised by the centrifugal force generated by the rotation of the reel.

As explained above, according to the present invention, the recoil starter can be sucked into the recoil starter case even in engines where the recoil starter cannot be cooled or is difficult to cool with the outside air sucked in by the flywheel that also serves as a cooling fan. In this way, the temperature rise of the recoil starter is suppressed, preventing deterioration of the heat-sensitive resin parts that make up the recoil starter, and reducing the chance of water or dust entering the recoil starter case. It has the effect of preventing the functionality of the device from deteriorating.

[Brief explanation of the drawing]

1 to 7 relate to an embodiment of the present invention,
Fig. 1 is a front view of the recoil starter, Fig. 2 is a rear view of Fig. 1, Fig. 3 is a view showing arrow B in Fig. 2,
Figure 4 is an enlarged sectional view taken along line A-A in Figure 1, Figure 5 is a front view of the starting pulley, Figure 6 is a sectional view taken along line C-C in Figure 5, and Figure 7 is D in Figure 5. -D line sectional view. 1...Crankshaft, 2...Crankcase, 3
...Start pulley, 4...Start shaft, 5...Reel,
6... Starting rope, 7... Case, 9... Recoil spring, 10... Ratchet claw, 14...
Engagement hole, 15... wing, 23... suction hole, 24...
Exhaust hole.

Claims (1)

[Scope of utility model registration request] a starting shaft provided to transmit torque via a starting pulley pivotally attached to the protruding end of the crankshaft; a reel pivotally attached to the starting shaft; a starting rope wound around the reel; starting pulley,
In a recoil starter consisting of a starting shaft and a case covering a reel, in which the recoil starter cannot or is difficult to be cooled by outside air sucked in by a flywheel that also serves as a cooling fan, outside air is drawn into the starting pulley. A cooling hole is provided in at least one of the left and right sides and a lower part of the case for sucking outside air into the case to cool the recoil starter component by using the blade. A recoil starter for small engines characterized by a discharge hole provided at the bottom of the case to exhaust outside air to the outside of the case.