JPH025095Y2 - - Google Patents

Description

[Detailed explanation of the invention] A. Purpose of the invention [Field of industrial application] This invention is a compact internal combustion engine used as a prime mover for outboard motors, tillers, small civil engineering or transport machines, etc. This invention relates to a starting device for a small internal combustion engine that is started by a recoil starter.

[Prior Art] When starting this type of internal combustion engine, the rotation of the gear shift control lever is used to lock the rotation of the recoil starter reel when the gear shift control lever is in a position other than the neutral position. This prevents the user from pulling the rope. In other words, starting is possible only when the transmission mechanism is in a neutral state (for example, Utility Model Publication No. 49-24821, Utility Model Publication No. 58-1983).
Publication No. 1656).

[Problems to be solved by the invention] All of the conventional starting devices that make it impossible to start the recoil starter except in the neutral state have a complicated interlocking structure between the locking mechanism for the recoil starter and the speed change operation member. However, there were problems with ease of assembly and smooth operation.

The present invention aims to solve the above-mentioned conventional problems in starting devices for small internal combustion engines.

B. Structure of the invention [Means for solving the problem] In a small internal combustion engine 3 equipped with a transmission mechanism 1 and started by a recoil starter 2, an edge of the reel 21 is placed on the outside of a reel 21 of the recoil starter. An operation in which a ratchet pawl 4 that engages and disengages from the tooth portion 22 is supported by a shaft 5, is always urged in the locking direction by a spring 6, and is moved in a direction perpendicular to the swinging plane of the ratchet pawl 4. Place the rod 7,
The cam portion 8 on the operating rod 7 is opposed to the side surface of the ratchet pawl 4, one end of the operating rod 7 is slidably supported on the machine frame 9, and the other end is rotated integrally with the gear shift operating lever 10. When the gear shift operating lever 10 is in the neutral position, the operating rod 7
The high portion H of the cam portion 8 pushes the ratchet pawl 4 to disengage it from the tooth portion 22, and when the shift operation lever 10 is in a position other than neutral, the low portion L of the cam portion 8 opposes the ratchet pawl 4 and disengages the ratchet pawl 4. The gist is that it is configured to be locked to the tooth portion 22.

[Function] When starting the internal combustion engine 3, shift operation lever 1
0 to a neutral position to keep the transmission mechanism 1 in a neutral state. By H, the ratchet pawl 4 is pushed outward as shown by the solid line in FIG. 3 and is removed from the tooth portion 22.

Therefore, in this state, if you grab the grip 23 of the recoil starter 2 and pull the rope 24, the reel 21
rotates, and engine 3 starts.

When the transmission mechanism 1 remains in the forward or backward state, that is, when the transmission lever 10 is in a position other than neutral, the lower portion L of the cam portion 8 of the operating rod 7 faces the ratchet pawl 4, so that the pawl 4 It turns inward by the force of the spring 6 and comes into contact with the edge of the reel 21 as shown by the chain line.

Therefore, in this state, that is, the gear shift operation lever 10
If the user forgets to switch the engine to the neutral position and tries to pull the rope 24 of the recoil starter 2 to start the engine, the teeth 22 will get caught on the ratchet pawl 4, making it impossible to start the engine.

[Embodiment] The figure shows an example in which the starting device of the present invention is implemented in an outboard motor, and the internal combustion engine 3 is a so-called vertical type engine in which the crankshaft is arranged vertically. The recoil starter 2 is a plunge mesh type provided on the side of the engine 3, and the recoil starter 2
When the engine is started, the pinion gear 25 integrated with the reel 21 meshes with a ring gear (not shown) integrated with the flywheel 32 fixed on the crankshaft 31 of the internal combustion engine 3.

The rotational torque of the crankshaft 31 of the internal combustion engine 3 is transmitted to the propeller 13 via the directly connected vertical drive shaft 12 and the transmission mechanism 1 .

An extension case 15 that accommodates the vertical drive shaft 12, transmission mechanism 1, etc. is coupled to the lower surface of the cover case 14 that accommodates the internal combustion engine 3.

A pair of upper and lower extension brackets 16, 16 that protrude forward is attached to the extension case 15. are connected so that they can be

The upper portion 18A of the swivel case 18 is connected via a horizontal pivot 42 to the upper portions of a pair of left and right stern brackets 41 which are detachably fixed to the stern plate 19 of the hull by a clamper 40 so as to be tiltable in the vertical direction.

A handle bracket 43 is integrally provided with the upper extension bracket 16.
A steering handle 44 is attached to this.

A shift operation shaft 45 is provided on one side of the upper end of the extension case 15 and extends through the case 15 from side to side.
A shift lever 10 is fixed to the outer end of the shaft 45, and the upper end of a shift rod 47 is connected to the inner end located inside the extension case 15 via an arm 46. There is.
Therefore, when the shift operation lever 10 is rotated, the shift rod 4 is rotated via the shift operation shaft 45 and the arm 46.
7 can be raised and lowered to three positions: forward, neutral, and backward.

A click stop mechanism (a fan-shaped plate 48 with three recesses on the periphery and an elastic pressure contact that engages and disengages with the recesses) is used to hold the gear shift operation lever 10 at each rotational position corresponding to the three positions described above of the shift rod 47. A roller 49) is provided in relation to the shift operation shaft 45 and the extension case 15.

A throttle wire 50 is disposed at the bottom of the cover case 14 in the left-right direction, and a choke wire 51 is disposed intersecting in the front-rear direction. One end of the inner wire of the throttle wire 50 is windably connected to a pulley 52 which is rotated by a throttle grip 44A provided on the steering handle 44, and the other end is connected to the ratchet via a top piece. It is connected to one end of an arm 53 fixed on the claw support shaft 5. The ratchet pawl 4 is rotatably supported on the shaft 5.

An arm 54 other than the arm 53 fixed on the ratchet pawl support shaft 5 and a carburetor 55
It is connected to the upper throttle lever 56 by a rod 57.

One end of the inner wire of the cable wire 51 is
Chiyoke knob 5 provided on the front of the cover case 14
8, the other end is connected to a choke lever 59 on the carburetor 55. The carburetor side end of the cable 51 is supported by a wire receiver 61 integrally formed on the upper surface of the air guide tube 60 of the carburetor 55.

The machine frame 9 that supports the upper end of the ratchet pawl operating rod 7 in a freely sliding manner may be used as appropriate, but the embodiment uses a frame that supports the upper end of the ratchet pawl support shaft 5, which also serves as the throttle shaft. A slit 91 into which the upper end of the operating rod 7 is inserted is provided on the upper surface of the bearing frame,
Grommet 62 fitted into the inner periphery of the slit 91
The operating rod 7 is inserted through and supported.

Both ends of the bearing frame 9 are fixed to the projecting portion 33 of the engine 3 and the upper surface of the extension case 15, that is, to the projection 151 on the engine mounting surface with bolts 63, 63. The lower end of the ratchet pawl support shaft 5 is fitted into a bearing hole 152 on the engine mounting surface of the extension case 15.

The arm 11 connecting the lower end of the ratchet pawl operating rod 7 is located within the rotation locus of the extended end 531 of the throttle arm 53, and prevents throttle operation when the shift operating lever 10 is in the neutral position.
In the forward position, it is free, and in the reverse position, it is regulated so that throttle operation is only possible in the low speed range.

The starting device for a small internal combustion engine of the present invention can be effectively applied to an internal combustion engine mounted on a tiller or other working machine, in addition to the illustrated outboard motor.

C. Effects of the invention The starting device for a small internal combustion engine of the present invention is provided with the transmission mechanism 1 as described above, and in the small internal combustion engine 3 started by the recoil starter 2, the reel is placed outside the reel 21 of the recoil starter. A ratchet pawl 4 that engages and disengages from the teeth 22 on the edge of the ratchet 21 is provided supported on the shaft 5, and is constantly biased in the locking direction by a spring 6 in a direction perpendicular to the swing plane of the ratchet pawl 4. Place the operating rod 7 that moves to
The cam portion 8 on the operating rod 7 is opposed to the side surface of the ratchet pawl 4, and one end of the operating rod 7 is slidably supported on the machine frame 9, and the other end is rotated integrally with the gear shift operating lever 10. When the gear shift operating lever 10 is in the neutral position, the operating rod 7
The high portion H of the cam portion 8 pushes the ratchet pawl 4 to disengage it from the tooth portion 22, and when the shift operation lever 10 is in a position other than neutral, the low portion L of the cam portion 8 opposes the ratchet pawl 4 and disengages the ratchet pawl 4. Since it is configured to be locked to the tooth portion 22, when the transmission mechanism is switched to a state other than neutral, for example, forward or reverse, the rotation of the recoil starter reel is locked to prevent starting operation. A ratchet type lock mechanism (the teeth 22 on the reel 21 and the ratchet pawl 4) for operating the transmission mechanism 1 is connected to an arm 11 that rotates integrally with the gear shift operation lever 10 for operating the gear shift mechanism 1, It can be operated by the cam part 8 on the operating rod 7 that is moved forward and backward by the rotation of the arm 11, and the structure of the interlocking system for operating the lock mechanism is simpler than that of the conventional starter device. Therefore, the operation is reliable.

[Brief explanation of the drawing]

Fig. 1 is a side view of an outboard motor equipped with the inventive starter, Fig. 2 is an enlarged plan view of the engine section with the cover case partially cut away, and Fig. 3 is a plan view of the lock mechanism section.
Figure 4 is a front view, and Figure 5 is a side view. 1 is a transmission mechanism, 2 is a recoil starter, 21 is a reel, 22 is a tooth portion, 23 is a grip, 24 is a rope, 3 is an internal combustion engine, 4 is a ratchet pawl, 5 is a support shaft, 6 is a ratchet pawl biasing spring, 7 is a ratchet pawl operating rod, 8 is a cam portion, 9 is a machine frame, 10 is a speed change operating lever, and 11 is an arm.

Claims (1)

[Scope of utility model registration request] In a small internal combustion engine equipped with a speed change mechanism and started by a recoil starter, a ratchet pawl is provided on the outside of the reel of the recoil starter and is supported by a shaft and that engages and disengages from teeth on the edge of the reel. Therefore, an operating rod is arranged that is always biased in the locking direction and moves in a direction perpendicular to the swinging surface of the ratchet pawl, and the cam portion on the operating rod is opposed to the side surface of the ratchet pawl. One end of the rod is slidably supported on the machine frame, and the other end is connected to an arm that rotates together with the gear shift operating lever. A starting device for a small internal combustion engine configured such that when the ratchet pawl is pushed out and removed from the teeth, and the gear shift operating lever is in a position other than neutral, the lower part of the cam faces the ratchet pawl and locks the ratchet pawl on the teeth. .