JPH08200156A - Choke lever protection structure of engine - Google Patents

Abstract

PURPOSE: To simplify constitution of a choke lever to open and close an intake port and to securely perform protection of the choke lever. CONSTITUTION: Since a choke lever 122 is rotatably disposed at a carburetor and an operation part 122a extended to the side of an air cleaner cover 120 is covered with a protector 121, when a pulled-out starter handle 101 is wound around the coil starter side, even when there is a fear of making abutting against the operation part 122a of the choke lever 122, the damage of the operation part 122a of the choke lever 122 is prevented from occurring. Even when the operation part 122a of the choke lever 122 is about to hook an obstacle, such as the branches of a tree, the operation 122a is prevented from unexpected rotation and malfunction of the choke lever 122 is prevented from occurring.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine choke lever protection structure for protecting an engine choke lever.

[0002]

2. Description of the Related Art In a mechanism for operating a choke valve in a general-purpose internal combustion engine in which at least the periphery of a carburetor is covered with a panel member, a rod or a link provided through the panel member is generally used as a choke lever. The choke valve is opened and closed by connecting and pushing and pulling the rod or link on the outside of the panel member.

However, in the operation mechanism of such a choke valve, an unreasonable force is applied to the rod or the link during the operation, and the rod or the link is bent or the operation feeling is bad. There was a problem such as.

Therefore, in Japanese Patent Publication No. 63-39395, as shown in FIGS. 7 and 8, the carburetor 5 is provided with the choke knob 4 connected by the engagement of the pin 2 of the choke lever 1 and the bifurcated arm 3. By adopting a configuration in which the panel portion 6 disposed in the vicinity thereof is slid back and forth along the slit 7 provided in the horizontal direction, it is possible to move the choke lever by pushing and pulling the rod or link described above. In comparison, a choke valve operating device is proposed in which the operating force is reliably transmitted to the choke lever 1 and the operating force is reduced to improve the operating feeling.

[0005]

However, in the above-described conventional choke valve operating device, the choke lever 1 is used.
In order to slide the knob portion 8 of the panel 8 in the recess 6a of the panel portion 6, the knob portion 8 has a slide guide piece 8a and a retaining piece 8
b. It is necessary to provide the bifurcated arm 3, and further, the pin 2 is provided on the choke lever 1 side and the pin 2 is engaged with the bifurcated arm 3. Therefore, the number of parts is not only increased. Or, the number of assembling steps increases, and further, although the knob portion 8 of the choke lever 1 is housed and protected in the recess 6a of the panel portion 6, it is necessary to process the recess 6a into a concave shape. There was a problem that it invited up.

Further, since the knob portion 8 of the choke lever 1 is exposed, the choke valve may be deformed due to an external impact, and the choke valve may not be operated properly. There is also a problem in that the portion 8 is caught by an obstacle such as a tree branch and is inadvertently moved to cause an erroneous operation of the choke valve.

The present invention has been made in view of such circumstances, and an object thereof is to provide a choke lever protection structure for an engine, which has a simple structure and can reliably protect the choke lever. And

[0008]

In order to achieve the above object, a choke lever protection structure for an engine according to the present invention has a crankcase (1) in which a cylinder (100) is fixedly installed.
0), a recoil starter (102) is attached to one end of a crankshaft (18) that is rotatably supported in the horizontal direction, and the crankshaft (1) of the cylinder (100) is attached.
The carburetor (11) is provided on the side facing the vertical plane including the axis of (8).
0) and an air cleaner (120a) having an air cleaner cover (120) attached to the free end side of the carburetor (110), and a starter handle (10) for rotating the recoil starter (102).
1) is provided so as to be drawn out toward the air cleaner (120a) side, and the carburetor (110) is attached to the carburetor (1).
10) A choke lever (122) having a choke valve (122c) capable of opening and closing an intake port (124) and an operating portion (122a) extended from the air cleaner cover (120) is rotatably provided. Operation part (122
(a) a protector (121) integrally extended from the air cleaner cover (120) in a direction intersecting the direction in which the starter handle (101) is pulled out.
It is characterized by being covered by.

[0009]

In the engine choke lever protection structure of the present invention, the operating portion (122a) of the choke lever (122) extended from the carburetor (110) is pulled out of the starter handle (101) from the air cleaner cover (120). Since it is covered by the protector (121) which is integrally extended in the direction intersecting the direction, the pulled out starter handle (101) has the recoil starter (10).
When it is wound on the 2) side, there is a risk that it will strike against the operating portion (122a) of the choke lever (122), but even in such a case, the operating portion (122a) is protected by the protector (121). Therefore, the operation portion (122a) of the choke lever (122) is prevented from being damaged.

Further, even if the operating portion 122a of the choke lever 122 is likely to be caught by an obstacle such as a tree branch during work, the protector 121 protects the operating portion 122a, so Prepare the operation unit 1
22a is not rotated, and the erroneous operation of the choke lever 122 is prevented.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 3 show an embodiment in which the engine choke lever protection structure of the present invention is applied to a portable blower.

As shown in these figures, the first casing 20, the second casing 30, and the third casing of the portable blower are shown.
The casing 40 is divided into three parts.

Ring-shaped handle pieces 21 and 31 are provided on the tops of the first casing 20 and the second casing 30, and these are fastened by fixing bolts 23 to form a handle portion 22. .

A trigger-like throttle lever 24 is provided on the lower side of the handle portion 22 so as to be rotatable in the directions of arrows a and b. When the handle portion 22 is gripped, a finger is put on the throttle lever 24. The engine speed can be increased by pulling in the arrow a direction and rotating the same. A slide-type engine stop button 25 is provided on the upper side of the handle portion 22, and when the engine is stopped, the engine stop button 25 is pushed in the direction of the arrow so that the ignition coil 103, etc., which will be described later, can be operated. The circuit is designed to be interrupted.

A plurality of slits 32 for discharging the hot air inside the second casing 30 to the outside of the side portion of the second casing 30 and a cooling air provided by a cooling fan 60 described later are discharged to the outside. The inclined surface portion 35 having the opening 33 and the plurality of slits 34 is provided, and details thereof will be described later.

Further, on the side portion of the second casing 30,
The fuel tank 90 on the carburetor 110 side before starting the engine
A primer pump 35A for feeding the fuel from the is provided. In the vicinity of the primer pump 35A, a starter handle 101 is provided so as to be drawn out toward the air cleaner 120a side which is in an obliquely rearward and upward state.

An air cleaner cover 120 for protecting the air cleaner 120a attached to the carburetor 110 is provided in the notch 36 provided at the rear end of the second casing 30. As shown in FIG. 3, the carburetor 110 is provided with a choke lever 122 having an operating portion 122a guarded by a protector 121 so as to be rotatable about a shaft 122b as a pivot point. When the operation portion 122a of the choke lever 122 is rotated upward in accordance with the symbol 123, the choke valve 122c moves the intake port 124 of the carburetor 110.
Is closed, and conversely, when the operation portion 122a is rotated downward,
The choke valve 122c opens the intake port 124 of the carburetor 110, so that the concentration of the fuel mixture can be changed.

Here, the operating portion 1 of the choke lever 122.
By covering 22a with the protector 121,
For example, when the starter handle 101 pulled out at the time of engine start is released, damage to the operating portion 122a of the choke lever 122 by the starter handle 101 during rapid winding to the recoil starter 102 side due to the restoring force of the spring 102a is prevented. It is supposed to be done.

During the cleaning work, the choke lever 122 is also used.
The operating portion 122a may be caught in a branch of a tree or the like and rotated, but such a problem can be solved by the guard provided by the protector 121.

The head of the spark plug 130 is seen through the opening 37 formed on the upper side of the second casing 30, and when replacing the spark plug 130, a tool can be inserted through the opening 37. It is like this.

The middle part of the second casing 30 is
It is fixed to the case piece 11 side of the crankcase 10 with a fixing bolt 38. Where the crankcase 1
The case piece 12 side of No. 0 has the structure shown in FIG. That is, a plurality of openings 13 and screw insertion holes 14a are formed around the crankshaft insertion hole 10A formed in the substantially central portion of the side surface of the case piece 12.
The case pieces 11 and 12 are fixed to each other by inserting the screws 14 into the screw insertion holes 14a.

The lower end portion 15 of the case piece 12 having the bolt insertion hole 16a is formed by connecting the bolt insertion hole 26a and the bolt insertion hole 26a of the boss 26 projecting on the first casing 20 side shown in FIG. A nut 17 is screwed onto a bolt 16 inserted between them, so that the bolt 16 is fixed to the first casing 20 side.

A flange 17 having a screw attachment hole 17a and a knock pin attachment hole 17b is provided on the outer periphery of the upper end of the case piece 12, and the outer periphery of the upper end is provided with the screw attachment hole 17a and the knock pin attachment hole. 1
It is adapted to be fixed to the first casing 20 side by a screw and a knock pin (not shown) attached to 7b.

The flange 11a of the case piece 11 is in contact with the outer peripheral end 39a of the tubular body 39 projecting from the inside of the second casing 30 shown in FIG. A recoil starter 102 is rotatably attached to a boss 38 provided on the boss 38 by a bolt 38a. A spring 1 for giving a restoring force to the recoil starter 102.
02a is provided so that the starter handle 101 that is pulled out when the engine is started can be wound up.

To the recoil starter 102, one end 18a of the crankshaft 18 is fixed by a nut 19. The crankshaft 18 is horizontally rotatably supported in the crankshaft insertion holes 10A, 11A of the case pieces 11, 12 of the crankcase 10 via bearings 10B, 11B. The cooling fan 60 attached to the other end portion 18b of the crankshaft 18 is prevented from coming off by a connecting boss 62 attached via a connecting screw 61.

A screw portion 63 provided on the connecting boss 62
An elevating fan 70 is attached to the via a fixing screw 64 and a washer 65. The blower fan 70 is housed inside a blower chamber 56 formed by the first casing 20 and the third casing 40, and the cover 80 is inserted inside the blower chamber 56 by the rotation of the blower fan 70. When the outside air is taken in, the air is blown to the outside from the blower port 57 formed by the first casing 20 and the third casing 40. Here, the first casing 20 and the third casing 40 are fixed by fastening members (not shown) such as bolts.

On the other hand, the rotation of the cooling fan 60 causes the first
Notch 27 formed at the lower end of the casing 20 of
The outside air taken in from the inside is introduced into the blower chamber 50 formed by the crankcase 10 and the first casing 20 along the arrow direction, and then formed by the first casing 20 and the second casing 30. It is adapted to be fed in the direction of the arrow toward the space 55 side.

A space 55 which is the upper part of the crankcase 10.
A cylinder 100 is disposed on the side, and is cooled by cooling air introduced into the space 55 by the cooling fan 60.

An ignition coil 103 is connected to the cylinder 100. Also, on one side of the cylinder 100,
As shown in FIG. 4, a carburetor 110 is connected, and a muffler 130 for exhausting air is further connected to the other side part via a connection part 131.

The tail pipe 130A of the muffler 130 is
As shown in FIG. 4, it projects toward the blower port 57 side and is exhausted to the outside.

The carburetor 110 side and the muffler 13 are also provided.
Insulating plates 104 and 105 are arranged between the 0 side and the side, so that heat from the cylinder 100 is blocked.

On one end 104a side of one heat insulating plate 104, one end 108a side of a baffle plate 108 fixed by a screw 107 to a boss 106 projecting inside the second casing 30 abuts. ing. The other end 108 b side of the baffle plate 108 is engaged with a rib 109 projecting inside the second casing 30.

As a result, the cooling air introduced into the space 55 by the cooling fan 60 is introduced by the air guide plate 108 toward the opening 33 formed in the second casing 30. There is.

On the side of the end portion 105a of the other heat insulating plate 105,
The cooling air that is connected to the inclined surface portion 35 and is guided by the baffle plate 108 is discharged to the outside by the inclined surface portion 35, and at the same time, the cooling air that has passed through the slits 34 formed in the inclined surface portion 35 causes the muffler 130. Is to be cooled.

In the lower part of the first casing 20,
The fuel tank 90 is attached with the tank cap 91 closing the inlet 90A facing upward. Here, as shown in FIG. 6, the fuel tank 90 is provided with a recess 92 that serves as a ventilation port for cooling air when the fuel tank 90 is mounted on the first casing 20.

Further, the fuel tank 90 has a screw insertion hole 9
3 is provided, and the screw 95 inserted into the screw insertion hole 93 is screwed onto the boss 19a projecting on the case piece 12 side, so that the fuel tank 90 is set to the first position. It is adapted to be fixed to the lower part of the casing 20.

Next, the operation of the portable blower having such a structure will be described. First, before starting the engine, the primer pump 35A is pushed several times to send the fuel in the fuel tank 90 to the carburetor 110 side, and then the starter handle 101 is pulled to connect the crankshaft 18 to the recoil starter 102. Rotate to start the engine.

At this time, when the hand is released from the starter handle 101 pulled out from the side portion of the second casing 30, when the starter handle 101 is wound around the recoil starter 102 by the restoring force of the spring 102a, the starter handle 101 is choked. Operation part 122a of lever 122
However, even in such a case, the operating portion 122a is protected by the protector 121, so that the operating portion 122a of the choke lever 122 is prevented from being damaged.

Here, when the engine is warmed up,
The operating portion 1 of the choke lever 122 shown in FIG. 1 or FIG.
By rotating 22a upward and closing the intake port 124 of the carburetor 110 by the choke valve 122c, a high-concentration fuel mixture can be supplied. When the engine gets warm, the operating portion 122a of the choke lever 122
And rotate the choke valve 122c to the carburetor 110.
The steady operation of the engine is performed by opening the intake port 124 away from the intake port 124 of the engine.

When the cleaning work is started, the handle portion 22 is held with the blower port 57 side facing forward, and the throttle lever 23 is pulled in to the arrow a side to increase the engine speed. As a result, the rotation of the blower fan 70 attached to the crankshaft 18 is increased, and the rotation of the blower fan 70 causes the start-up fan formed by the first casing 20 and the third casing 40 via the cover 80. The outside air is vigorously taken into the inside of the wind chamber 56, and then is blown outside from the blower opening 57.

The amount of air blown from the air blow port 57 at this time is adjusted by adjusting the amount of pull-in of the throttle lever 23 and controlling the engine speed.

At this time, the cooling air taken in from the notch 27 at the lower end of the first casing 20 by the rotation of the cooling fan 60 attached to the crankshaft 18 is crankcased as shown in FIG. After being guided in the blower chamber 50 formed by the first casing 20 and the first casing 20 along the arrow direction, the space 55 formed by the first casing 20 and the second casing 30 is moved in the arrow direction. The cylinder 100 is cooled by being sent along.

The cooling air that has cooled the cylinder 100 is shown in FIG.
As shown in FIG.
Baffle plate 108 disposed between the casing 30 and
The opening 3 formed in the second casing 30 by
The wind is guided to the 3rd side.

At this time, the cooling air guided by the baffle plate 108 has an opening 33 along the inclination direction of the inclined surface portion 35.
At the same time, the muffler 130 is cooled by passing through the slit 34 formed in the inclined surface portion 35 at the same time as being blown out to the outside.

Therefore, during the work, the cylinder 100 is cooled by the cooling air from the cooling fan 60 and the muffler 130 is also cooled at the same time, so that the first, second and third casings constituting the portable blower do not become hot. ,
Discomfort during work is reduced.

Further, the cooling air blown out from the opening 33 along the inclination direction of the inclined surface portion 35 is blown out in the obliquely forward direction along the surface of the second casing 30, so that the hot air works. Since it is blown away avoiding people, even a left-handed worker will not feel uncomfortable,
Easy long-term cleaning work.

Further, during the cleaning work, the choke lever 12
Even when the second operation unit 122a is about to be caught by an obstacle such as a tree branch, the operation unit 122a is guarded by the protector 121, so the operation unit 122a is inadvertently rotated. Therefore, the erroneous operation of the choke lever 122 is prevented.

On the other hand, when finishing the work and stopping the engine, the engine stop button 25 provided on the upper side of the handle portion 22 is slid in the direction of the arrow as shown in FIG. The engine is stopped by cutting off the circuit of the electric system such as the coil 103.

As described above, in this embodiment, the choke lever 122 is rotatably arranged on the air cleaner cover 120 about the shaft 122b as a pivot point, and the operation portion 122a extended from the side portion of the air cleaner cover 120 is provided. By operating the choke valve 122c provided at the end of the choke lever 122 to open and close the intake port 124 of the carburetor 110, the number of parts constituting the choke lever 122 is reduced, and the choke lever 122 has a smaller number of parts. Since the number of assembling steps is significantly reduced, the cost can be reduced.

Further, an operating portion 122 is provided on the side of the vaporizer 110.
Since a is extended and the operating portion 122a is covered by the protector 121 integrally extended from the air cleaner cover 120 in the direction intersecting with the direction in which the starter handle 101 is pulled out, the pulled out starter handle 101 Operation part 122a of the choke lever 122 when the coil is wound around the coil starter 102 side.
However, even in such a case, the operating portion 122a is protected by the protector 121, so that the operating portion 122a of the choke lever 122 is prevented from being damaged.

Further, during the cleaning work, the choke lever 12
Even when the second operation unit 122a is about to be caught by an obstacle such as a tree branch, the operation unit 122a is guarded by the protector 121, so the operation unit 122a is inadvertently rotated. Therefore, the erroneous operation of the choke lever 122 is prevented.

In this embodiment, the rotation of the cooling fan 60 causes the notch 27 in the lower end portion of the first casing 20.
From outside into the blower chamber 50 formed by the crankcase 10 and the first casing 20, and the outside air is taken as cooling air to be distributed in the space 55 formed by the first casing 20 and the second casing 30. Cylinder 10 installed
In addition to cooling 0, the cooling air that has cooled the cylinder 100 is blown to the outside from the opening 33 along the inclination direction of the inclined surface portion 35, and at the same time, the muffler 130 is cooled by the cooling air that has passed through the slit 34 of the inclined surface portion 35. I chose

Therefore, the blowing direction of the cooling air from the opening 33 is set to the oblique front direction along the surface of the second casing (30) so that the hot air is blown out avoiding the operator, which causes an uncomfortable feeling. Because there is nothing to give,
Long-term cleaning work is possible for right-handed and left-handed workers.

In addition, the muffler 130 is caused by a part of the cooling air.
Since the muffler 130 is also cooled at the same time so as to enhance the cooling effect, a small muffler can be attached, and the portable blower can be made smaller and lighter.

[0055]

As described above, according to the engine choke lever protection structure of the present invention, the air cleaner (1
20a), a choke valve (122c) for opening and closing an intake port (124) of the carburetor (110) and a carburetor (11).
The choke lever (122) having the operation portion (122a) extended from the (0) is rotatably provided, so that the choke lever (122) for opening and closing the intake port (124).
The number of parts can be significantly reduced, and the number of assembling steps can also be significantly reduced, so that the cost can be reduced.

The operating portion (122a) of the choke lever (122) extended from the carburetor (110) is moved from the air cleaner cover (120) to the starter handle (10).
Since it is covered by the protector (121) which is integrally extended in a direction intersecting with the pulling direction of 1), when the pulled out starter handle (101) is wound on the recoil starter (102) side, Although there is a risk of colliding with the operating portion (122a) of the choke lever (122), even in such a case, the operating portion (122a)
Since a) is guarded by the protector (121), the operation part (122a) of the choke lever (122) is
Can be prevented from being damaged.

Further, even if the operating portion 122a of the choke lever 122 is about to be caught by an obstacle such as a tree branch during the work, the operating portion 122a is guarded by the protector 121. Prepare the operation unit 1
It is possible to prevent the erroneous operation of the choke lever 122 without the 22a being rotated.

[Brief description of drawings]

FIG. 1 is a left side view showing a portable blower according to an embodiment of an engine cooling air guide structure for a portable blower of the present invention.

FIG. 2 is a sectional view taken along line II-II showing the portable blower of FIG.

FIG. 3 is a rear view showing the portable blower of FIG.

FIG. 4 is a sectional view taken along line IV-IV showing the portable blower of FIG. 1.

5 is a front view showing a case piece portion of the crankcase of FIG. 2. FIG.

6 is a plan view showing the fuel tank of FIG. 1. FIG.

FIG. 7 is a view showing a conventional choke valve operating device.

8 is a diagram showing an operating device of the choke valve of FIG. 7. FIG.

[Explanation of symbols]

 10 Crankcase 11, 12 Case Piece Part 20 First Casing 22 Handle Part 24 Throttle Lever 25 Engine Stop Button 30 Second Casing 34 Slit 35 Slope 35A Primer Pump 40 Third Casing 50 Blower Chamber 55 Space 56 Winding Room 57 Blower 60 Cooling Fan 70 Blower Fan 90 Fuel Tank 100 Cylinder 101 Starter Handle 102 Recoil Starter 110 Vaporizer 120 Air Cleaner Cover 121 Protector 122 Choke Lever 122a Operation Part 122c Choke Valve 124 Intake Port 130 Spark Plug 130 Muffler 108 Guide Wind Board

Claims (1)

[Claims] 1. A recoil starter (102) is attached to one end of a crank shaft (18) which is rotatably supported in a horizontal direction with respect to a crank case (10) in which a cylinder (100) is fixedly mounted. The carburetor (110) is provided on the side of the cylinder (100) that faces the vertical plane including the axis of the crankshaft (18), and the air cleaner cover (120) is attached to the free end side of the carburetor (110). Attached to the air cleaner (120a), a starter handle (101) for rotating the recoil starter (102) is provided so as to be drawn toward the air cleaner (120a) side, and the vaporizer (110) is equipped with the vaporizer (110). Extending from the choke valve (122c) and the air cleaner cover (120) that can open and close the intake port (124) of the device (110). A choke lever (122) having an opened operation portion (122a) is rotatably provided, and the operation portion (122a) is arranged in a direction intersecting with a direction in which the starter handle (101) is pulled out. ) Is integrally covered with a protector (121), which protects the choke lever of the engine.