JPH075250Y2 - Forced air-cooled engine recoil starter starting handle pull-out direction change device - Google Patents

Description

[Detailed Description of the Invention] << Industrial Application Field >> The present invention relates to a forced air-cooled engine equipped with a recoil starter mounted on, for example, a small agricultural machine, when the starting handle is pulled out in either the left or right direction when the engine is started. The present invention relates to a device for changing the direction of operation of pulling out a starting handle that can be switched.

<< Prior Art >> Some devices of this type have a basic structure as follows.

For example, as shown in FIGS. 1 to 3 or FIGS. 6 and 7, a fan 7 and a fan case 8 are provided on one side surface of the air-cooled engine 1, and a dustproof case 10 is provided on the outer end surface of the fan case 8. The dustproof air inlet 13 is opened in the eccentric protrusion 12 of the dustproof case 10, and the outside air is sucked from the dustproof air inlet 13 through the dustproof case 10 to the fan case 8 by the blowing action of the fan 7, and then from the fan case 8. It is configured to spray onto the cylinder 4 and the cylinder head 5 of the air-cooled engine 1, and the recoil starter 15 is provided in the center of the dustproof case 10.
The recoil starter 15 is configured to start the air-cooled engine 1 by rotating the engine rotation shaft 6 via the starting wheel 16, and the pull-out ports 21 and 22 of the starting rope 20 of the recoil starter 15 are arranged around the dust-proof case 10. Of the eccentric protruding part 12 on both sides of the surface near the base end, and connect both drawer ports 21 and 22 with the rope moving groove 23 for switching the handle withdrawing operation direction. Eccentric protrusion on the outer end surface of the dustproof case 10
Run so that it crosses the base end of 12 and start rope 20
The pull-out operation direction of the starting handle 25 is changed by switching and moving the pull-out end portion 20a of the above through the rope moving groove 23 between the pull-out ports 21 and 22.

In the above-mentioned basic structure, there is a conventional one shown in FIG. 6 and FIG. 7 previously proposed by the present inventor in Japanese Utility Model Publication No. 63-146166. In this, the outer end surface of the rope moving groove 23 was always left open.

<Problems to be solved by the invention> In the engine with a recoil starter having the above-described conventional structure, when changing the pull-out operation direction of the starting handle 25,
As shown in the figure, the pull-out end 20a of the starting rope 20 can be moved in the left-right direction from the outer end surface side of the dust-proof case 10 along the rope-moving groove 23, which is advantageous in that it can be easily changed. .

However, when this engine is mounted on a soil-cultivating agricultural machine, the mud that is thrown up during farming work will not be able to move through the rope-moving groove.
There was a risk that the dust would enter the dust-proof case 10 from 23 and stick to the starting rope 20 and the recoil mechanism, making it difficult to start the next time.

An object of the present invention is to prevent malfunction of a recoil starter due to intrusion of mud.

<< Means for Solving the Problems >> The present invention is characterized in that the following improvements are made to the basic structure in order to achieve the above object.

(Invention of Claim 1) For example, as shown in FIGS. 1 to 3, a rope moving groove is provided.
The mud-proof lid 32 is opened and closed by a mud-proof lid 32, and the mud-proof lid 32 is biased toward the closed side by a lid closing biasing means 33.

The mud cover 32 has a structure that swings up and down vertically, and a structure that slides vertically to open and close.
Alternatively, a structure in which a link mechanism opens and closes is conceivable. Further, as the lid urging means 33, one utilizing spring, gravity or magnetic force can be considered.

(Invention of Claim 2) In the invention of Claim 2, the following improvement is further added to the configuration of Claim 1.

That is, a rope sliding contact surface 41 for holding the lid for opening is provided over substantially the entire length of the edge 40 of the lid for opening the lid for preventing mud, and
Opening rope contacting surfaces 42 and 43 are provided at both ends of the lid opening edge 40 of 32, respectively, and the starting rope 20 of the recoil starter 15 is connected to each of the outlets 21
When moving from one side of the rope 22 to the other side through the rope moving groove 23, when opening the rope moving groove 23, each rope contacting surface for opening the lid
While contacting with 42 and 43, the mudproof lid 32 is pushed open against the lid closing biasing means 33, and in the process of moving the rope moving groove 23, it slides on the rope lid contact surface 41 for holding the lid. In contact, the mud lid 32 is configured to be continuously opened.

<Operation> The present invention operates as follows.

(Invention of Claim 1) The mud-proof lid 32 is moved by the closing lid urging means 33 so that the rope moving groove 23 can be moved.
Is always closed.

Start handle 25 from one outlet 22 to the other
When switching to 21, open the mud cover 32 and start the handle.
Holding 25, the pull-out end portion 20a of the starting rope 20 is moved from one pull-out port 22 through the rope moving groove 23 to the other pull-out port 21. After the switching, the mudproof lid 32 is closed by the lid biasing means 33.

The same operation may be performed when the starting handle 25 is switched in the opposite direction to the above.

When the engine is operated and, for example, agricultural work is performed, even if the mud flies toward the rope moving groove 23, the mud hits the mudproof lid 32 and falls, and enters the rope moving groove 23. do not do.

(Invention of Claim 2) For example, the starting handle 25 is shown on the right side as shown in a solid line drawing.
When switching from 22 to the left outlet 21 shown in the two-dot chain diagram, the starting handle 25 is operated as follows.

First, the starter handle 25 is slightly pulled out from the right side outlet 22, and the pull-out end portion 20a of the starter rope 20 is moved to the left side while being pulled slightly obliquely upward. Then the starting rope 2
In the process of entering the rope moving groove 23, 0 abuts on the right rope opening rope contacting surface 43 and pushes the mudproof lid 32 against the lid closing biasing means 33. Subsequently, in the process of pulling the starting handle 25 to the left and moving the starting rope 20 to the left in the rope moving groove 23, the starting rope 20 slides on the rope holding surface 41 for holding the open lid to prevent mud. Continue to open the lid 32. Then, after the starting handle 25 is moved to the vicinity of the left outlet 21, the starting rope 20 is stretched straight in a direction substantially parallel to the rope moving groove 23. Then, the starting rope 20 falls into the groove 23 for moving the rope and the sliding surface of the rope for holding the lid opens.
Separated from 41, the mudproof lid 32 is closed by the lid biasing means 33.

On the contrary to the above, when the starting handle 25 is moved from the left side outlet 21 to the right side outlet 22, the reverse procedure may be performed.

<< Effects of the Invention >> The present invention has the following effects because it is configured and operates as described above.

(Invention of Claim 1) In the engine operating state in which the starting rope is wound in the dustproof case, the mudproof cover covers the rope moving groove,
Prevents muddy soil jumped up during agricultural work from entering the dust-proof case through the rope moving groove.

Therefore, it is possible to prevent the recoil starter from malfunctioning due to muddy dirt sticking to the starting rope or the recoil mechanism, and the next start can be reliably performed.

(Invention of Claim 2) Since the mud cover can be automatically opened and closed in conjunction with the change operation of the handle withdrawing direction, the change operation is easy.

In addition, when automating the opening and closing of the mud cover, it is not necessary to newly provide an operation means for opening and closing the mud cover, so the handle pull-out direction changing device has a simple structure.

<< Embodiment >> An embodiment of the present invention will be described below with reference to the drawings.

1 to 3 show one embodiment.

As shown in FIG. 2, the engine body 2 of the forced air cooling engine 1 is formed in a vertical shape, and the cylinder 4 and the cylinder head 5 are mounted on the upper side of the crankcase 3. From the front surface of the crankcase 3 (the left surface in FIG. 2, the same applies hereinafter), the crankshaft 6, which is the engine rotation shaft, projects forward. A centrifugal cooling fan 7 is fixed to the protruding portion of the crankshaft 6, and the fan 7 is covered with a fan case 8.

A dustproof case 10 is fixed to the front surface of the fan case 7. As shown in FIGS. 1 to 3, the dustproof case 10 includes a case body 11 which is provided substantially concentrically with the crankshaft 6.
And an eccentric protrusion 12 protruding upward from the case body 11, and the eccentric protrusion 12 has a plurality of dust-proof air intakes 13.
Is opened. Then, when the air-cooled engine 1 is operated, the fan 7 is rotated, and its blowing action blows the outside air sucked into the fan case 8 through the dust-proof air inlet 13 through the dust-proof case 10 to the cylinder 4 and the cylinder head 5.

A recoil starter 15 is arranged in a penetrating manner in the central portion of the case body 11 described above, and the recoil starter 15 is linked to the crankshaft 6 via a starting wheel 16. The recoil starter front cover 17 is fixed to the case body 11 with a plurality of bolts 18.

On the left and right on the upper peripheral side of the recoil starter front cover 17,
Two outlets 21 of the starting rope 20 of the recoil starter 15
22 are formed, and these are located on the left and right sides of the eccentric protrusion 12 on the base end side portions (lower side portions). Both of the outlets 21 and 22 are communicated with each other through a rope moving groove 23 that runs in a state of traversing a portion near the base end of the eccentric protruding portion 12 in the left-right direction. Then, the pull-out end portion 20a of the starting rope 20 is passed through the rope moving groove 23 and the pull-out ports 21 on the left and right sides.
By switching and moving between 22, it is possible to change the pull-out operation direction of the starting handle 25.

Further, the upper edge 17a of the recoil starter front cover 17 is
Install the recoil starter 1 to the right part 23a of the rope moving groove 23.
5 is formed in a concentric circular arc shape so that it can be slightly seen from the outer peripheral edge 28a of the rope pulley 28, and the leftward portion 23b of the rope moving groove 23 is formed in a straight line shape. With this, when changing the pull-out operation direction of the starting handle 25, the starting rope 20 is allowed to ride on the outer peripheral edge 28a of the rope pulley 28 so that the starting rope 20 does not easily contact the upper edge 17a of the front cover 17. Has become. The top edge of this front cover 17
A rope protection edging member 29, which is circular in cross section, is joined to the inside of 17a over the entire circumference thereof.

In the above structure, the rope moving groove 23 is openably and closably covered by the mudproof lid 32, and the lid closing biasing means 33 for biasing the mudproof lid 32 toward the lid closing side is provided.

That is, the mudproof lid 32 is bent and formed in a U shape in a plan view, and the bent portions 35 and 36 are provided on the left and right sides of the lid main body 34 in the central portion so as to be rearward and upward. The left bent portion 35 is inserted into the cutout groove 37 formed in the lower front surface of the eccentric protruding portion 12 of the dustproof case 10, and the right bent portion 36 is inserted into the eccentric protruding portion 12.
It is mounted along the lower right peripheral surface of, and both bent portions 35 and 36 are supported by a pivot pin 38 so as to be vertically swingable. By biasing the above left bent portion 35 upward by the closing lid biasing means 33 composed of a tension spring, the lid main body 34 is biased downward to close the rope moving groove 23.

Further, a rope sliding contact surface 41 for holding the open lid is provided over substantially the entire length of the edge 40 of the open lid located under the mud lid 32. Furthermore, the rope contacting surfaces 42 and 43 for opening the lid are provided at both left and right ends of the edge 40 of the opening lid.

Next, a procedure for switching the pull-out operation direction of the starting handle 25 will be described.

When switching the starting handle 25 from the right side outlet 22 shown in the solid line diagram to the left side outlet 21 shown in the two-dot chain diagram,
Operate as follows.

First, the starter handle 25 is slightly pulled out from the right side outlet 22, and the pull-out end portion 20a of the starter rope 20 is moved to the left side while being pulled slightly obliquely upward. Then the starting rope 2
In the process of entering the rope moving groove 23, 0 abuts on the right rope opening rope contacting surface 43 and pushes the mudproof lid 32 against the lid closing biasing means 33. Subsequently, in the process of pulling out the starting handle 25 to the left and moving the starting rope 20 to the left in the rope moving groove 23, the starting rope 20 starts to rotate together with the pulley 28 while riding on the outer peripheral edge 28a of the pulley 28. While moving in the direction (arrow A in FIG. 1) while rotating, the mudproof lid 32 is continuously opened by slidingly contacting the open lid holding rope sliding contact surface 41. Then, set the starting handle 25 to the left outlet 21
Then, the starting rope 20 is stretched straight in a direction substantially parallel to the leftward portion 23b of the rope moving groove 23. Then, the starting rope 20 is pulled up by the pulley 28
It comes off from the outer peripheral edge 28a and falls into the winding groove 28b of the pulley 28. At the same time, the starting rope 20 is separated from the open lid holding rope sliding contact surface 41, and the mudproof lid 32 is closed by the lid closing biasing means 33. In this state, the starting handle 25 is hooked on the handle receiving member 46.

On the contrary to the above, when the starting handle 25 is moved from the left side outlet 21 to the right side outlet 22, the reverse procedure may be performed.

The mud-proof lid 32 may be one that slides in the vertical direction to open and close, or one that opens and closes with a link mechanism, instead of one that swings open and close. Further, the lid closing biasing means 33 may use gravity or magnetic force instead of using spring force.

FIG. 4 shows a modification of the starting rope in the case where the recoil starter is of a remote start type, and FIG. 5 shows a comparative example thereof.

Generally, in a remote start recoil starter, a starting rope is configured as shown in a comparative example of FIG. That is, the pull-out end portion 52 of the nylon-based starting rope 51 is connected to one end portion of the steel wire 54 via the metal connecting tube 53,
A starting handle 55 is fixed to the other end of the steel wire 54. A receiving member 56 made of rubber or nylon is fitted on the connecting cylinder 53. According to this structure, since the tension of the steel wire 54 is large, the starting handle 55 can be strongly operated for starting. On the other hand, when the starting rope 51 is unwound after the engine is started, the weight of the intermediate connecting portion 57 including the connecting tube 53 and the catch 56 is relatively large. There is a possibility that they may collide vigorously and damage them, and the structure for preventing this is complicated.

In solving this problem, an engine equipped with an automatic decompression type starter mechanism to reduce the starting operation force is
The starting rope was constructed as shown in FIG. That is, the starting handle 59 is directly connected to the nylon-based starting rope 60, the knot portion 62 is provided at the pull-out end portion 61 of the starting rope 60, and the knot portion 62 is fitted into the receiving member 63 made of rubber or nylon. It is As a result, since the connecting cylinder 53 can be omitted, the weight of the receiving intermediate portion 64 is correspondingly lightened, collision due to inertia during rewinding is prevented, and the manufacturing cost is low. Moreover, the above knot part
By changing the position of 62, the rewinding receiving position of the starting rope 60 can be adjusted, so that the operation for adjusting the position does not take time.

[Brief description of drawings]

1 to 3 show an embodiment of the present invention. FIG. 1 is a front view of a forced air cooling engine. FIG. 2 is a sectional view taken along the line II-II of FIG. FIG. 3 is an exploded perspective view of the dustproof case and the mudproof lid. FIG. 4 is a diagram showing a modified example of the starting rope in the case where the recoil starter is configured as a remote start type. FIG. 5 shows a comparative example and is equivalent to FIG. 6 and 7 show a conventional example. FIG. 6 is a view corresponding to FIG. 1, and FIG. 7 is a view corresponding to FIG. 1 ... Air-cooled engine, 4 ... Cylinder, 5 ... Cylinder head, 6 ... Engine rotation axis (crankshaft), 7 ...
Fan, 8 ... Fan case, 10 ... Dustproof case, 12 ...
… Eccentric protrusion, 13 …… Dustproof air intake, 15 …… Recoil starter, 16 …… Starting wheel, 20 …… Starting rope, 20a …… Drawer end, 21 ・ 22 …… Drawout, 23 …… Rope movement Groove,
25 …… Starting handle, 32 …… Mudproof lid, 33 …… Close lid biasing means, 40 …… Opening edge, 41 …… Rope sliding contact surface for holding lid, 42 ・ 43 …… For opening lid For rope contact.

Claims (2)

[Scope of utility model registration request] 1. A fan (7) and a fan case (8) are provided on one side surface of an air-cooled engine (1), and a dustproof case (10) is fixed to an outer end surface of the fan case (8). ) The dustproof air intake (13) is opened in the eccentric protrusion (12), and the air is blown by the fan (7) to prevent outside air from entering the dust air intake (13).
Is sucked into the fan case (8) through the dustproof case (10) and sprayed from the fan case (8) to the cylinder (4) and the cylinder head (5) of the air-cooled engine (1). Recoil starter (15) in the center of 10)
The recoil starter (15) is configured to start the air-cooled engine (1) by rotating the engine rotation shaft (6) via the starting wheel (16) with the recoil starter (15). The outlets (21) and (22) of the (20) are formed on the peripheral surface of the dust-proof case (10) at the base end portions on both sides of the eccentric protrusion (12), and the outlets (21) ( 22) communicates with the rope movement groove (23) for switching the handle pull-out operation direction, and the rope movement groove (23) is connected to the outer end surface of the dust-proof case (10) at the base end of the eccentric protrusion (12). Run to cross
By moving the pull-out end (20a) of the starting rope (20) through the rope moving groove (23) and switching between the pull-out ports (21) and (22), the pull-out operation direction of the start handle (25) In the device for changing the starting handle pull-out operation direction of the recoil starter for the forced air-cooled engine, which is configured to change, the rope movement groove (23) is covered with the mud cover (32) so that it can be opened and closed. ) Is a device for changing the starting handle pulling-out operation direction of the recoil starter for a forced air-cooled engine, characterized in that it is biased toward the lid by a lid biasing means (33). 2. A lid sliding rope contacting surface (41) for holding the lid is provided over substantially the entire length of the lid tip edge (40) of the lid (32), and the lid (32) is opened. Opening rope contacting surfaces (42) (43) are provided on both ends of the lid tip edge (40), and the starting rope (20) of the recoil starter (15) is attached to one of the outlets (21) (22). From the rope movement groove (2
When moving to the other side after passing through 3), contact the rope contacting surfaces (42) (43) for opening the lid and put the mud lid (32) in the process of entering the rope moving groove (23). In the process of pushing open against the lid closing biasing means (33) and moving in the rope moving groove (23), the rope comes into sliding contact with the open lid holding rope sliding contact surface (41) to prevent the mud lid (32). ) Is continuously opened, the starting handle pull-out operation direction changing device of the recoil starter of the forced air cooling engine according to claim 1.