JPH0213154B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recoil starter for manually starting an engine.

Conventionally, this type of recoil starter generally includes a recoil pulley in which a groove for winding the recoil rope is formed, which is rotatably fitted to a support shaft member, and a drive pawl that is pivotally attached to the side surface of the recoil pulley via a support shaft. ,
It consists of a friction plate or the like disposed on the side surface of the recoil pulley so as to frictionally engage with the support shaft member and cover the drive pawl, and the outer edge of the friction plate is bent toward the recoil pulley side, and a notch is provided at the bent portion of the outer edge. The tip of the drive claw is always slightly protruding from the section. When the engine is started, the recoil rope is pulled to rotate the recoil pulley, and the phase difference between the friction plate and the recoil pulley causes the drive pawl to protrude radially outward at the notch, which drives the rotating driven member connected to the engine side. The engine is started by engaging the claws and transmitting the rotation of the recoil pulley to the engine.

Therefore, when considering the engagement between the drive claw of the recoil starter and the rotating driven member on the engine side, it is desirable that the drive claw quickly protrude by a predetermined amount due to the rotation of the recoil pulley. It is difficult to say that the rotation of the drive claw around the spindle will be achieved quickly by simply engaging the notch at the tip as a contact part, and the drive claw will quickly protrude radially outward of the recoil pulley. hard.

In addition, especially in recoil starters attached to small engines such as power tillers, if the drive pawl is constantly protruding from the friction plate, foreign matter such as dirt and dust will adhere to the drive pawl, and the foreign matter will also break out of the friction plate. There is also a risk that the recoil starter may enter the interior through the parts and reduce the durability of the recoil starter.

The present invention has been devised to solve the above-mentioned problems, and an object of the present invention is to cause the drive pawl to quickly protrude a predetermined amount by rotating the recoil pulley, and furthermore to cause the drive pawl to protrude by a predetermined amount by rotating the recoil pulley. To provide a recoil starter that can be housed in a friction plate.

In order to achieve the above object, the present invention makes the contact portion with the drive pawl near the tip side of the drive pawl, and rotates the recoil pulley from an imaginary circle centered on the rotation center of the recoil pulley and passing through the tip of the drive pawl when stored. It is characterized by being deviated toward the center and formed protruding from the friction plate.

A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

Fig. 1 is a plan view of the recoil starter, Fig. 2 is a plan view of the recoil starter with the friction plate removed, and Fig. 3 is a plan view of the recoil starter.
A cross-sectional side view is shown.

1 is a starter case, a cylindrical support shaft member 2 is fixedly installed in the center of the starter case 1, a recoil pulley 3 is rotatably fitted to the support shaft member 2, and a side surface of the starter case 1 and the recoil pulley 3 is fitted. Return movement of the recoil pulley 3 is freely formed by a return spring 4 provided therebetween.

A winding groove 6 for winding the recoil rope 5 is formed on the outer periphery of the recoil pulley 3, and an inner cylindrical wall portion 7 protruding outward with a required diameter is formed on the side of the recoil pulley 3 opposite to the starter case 1. and forms the outer cylinder wall portion 8.

A cutout portion 11 is formed in a part of the tip edge portion of the outer cylinder wall portion 8, and a wall portion 12 connecting eight locations of the outer cylinder wall portion facing the cutout portion 11 and the inner cylinder wall portion 7 is formed. establish.

The driving claw 13 is a support shaft 1 that protrudes from the wall portion 12.
4, and as shown in FIGS. 2 and 3, a portion of the drive claw 13 is provided facing the cutout portion 11. This driving claw 13 is located on one side of the support shaft member 2 when viewed from above.

The drive pawl 13 has an elongated shape and has a substantially middle portion attached to the support shaft 1.
4, and one side portion extending from the support shaft 14 is formed into an engaging portion 15 that can freely engage with a rotating driven member (not shown), and a tip edge portion 15a of the engaging portion 15 is As shown by the solid line in FIG. 2, the drive claw 13 is formed so as to approximately match the outer peripheral contour of the outer cylinder wall 8 when it is stored, and the inner edge between the outer cylinder wall 8 and the inner cylinder wall 7 is It is formed on the engagement surface 15b.

The other side portion of the drive claw 13 extending from the support shaft 14 is formed into a locking portion 16 that locks and holds the drive claw 13 when the engagement portion 15 and the rotating driven member are engaged. Similarly to the above, the outer edge portion 16a of the drive claw 13 is formed to approximately match the outer peripheral contour of the outer cylinder wall portion 8 when the drive claw 13 is stored, and the inner edge portion is formed to approximately match the outer peripheral contour of the outer cylinder wall portion 8.
A locking surface 16b is formed that can freely match the receiving portion 7a.

A bolt 22 is provided protruding from the top surface of the support shaft member 2 via a nut 21 fixed to the support shaft member 2,
The bottom plate 23 is tightened and fixed deep inside the inner cylinder wall 7 by the lower end of the body of the bolt 22 and the top surface of the support shaft member 2, and one end is frictionally engaged with the bottom plate 23 to form the coil spring 2.
4 will be provided.

The friction plate 31 is arranged with its center portion facing below the head of the bolt 22 so as to compress the coil spring 24, and the friction plate 31 is frictionally engaged with the tip of the coil spring 24 and the inner peripheral portion near the tip. , washer 3 arranged on the underside of the bolt 22 head
Frictionally engage with 2.

The friction plate 31 includes a circular side surface portion 33 that covers the entire circumference of the tip of the outer cylinder wall portion 8, and a cylinder portion 34 in which the outer edge portion of the side surface portion 33 is bent so as to be parallel to the outer cylinder wall portion 8.
It consists of.

The side surface portion 33 is provided with a protrusion 36 for protruding a pawl that can freely come into contact with the drive pawl 15 on substantially the same circumference 35 centered on the axis of the support shaft member 2 and passing through the center of the support shaft 14. A locking protrusion 38 is formed and bulges apart from the protrusion 36 and is capable of freely coming into contact with the locking wall 37 that connects the outer cylinder wall 8 and the inner cylinder wall 7. and a protrusion 3 for claw protrusion in the cylindrical portion 34.
An opening 39 for protruding the drive claw 15 is provided in the vicinity of the drive claw 6 .

In the drawings, reference numeral 41 denotes a protrusion formed on the cylindrical portion 34 of the friction plate 31 for locking the drive pawl 15.

Next, the operation of the recoil starter when starting the engine will be described. First, the drive pawl 13 rotates together with the recoil pulley 3 due to the tension of the recoil rope 5. At this time, since the friction plate 31 is in frictional engagement with the coil spring 24 and the washer 32, a phase difference occurs with the recoil pulley 3, and the drive pawl 13
The engaging surface 15b of the drive pawl 13 engages with the protrusion 36, and while being guided by the protrusion 36, the engaging portion 15 of the drive claw 13 engages with the opening 39.
It protrudes radially outward from the shaft and engages with the rotating driven member to start the engine.

After the engine is started, the driving pawl 13 is retracted by the rotation of the rotary driven member, or when the recoil pulley 3 is returned by the return spring 4, it is retracted in contact with the edge of the opening 39, and the friction plate 31 and the recoil pulley 3 are connected to the protrusion 38. By locking with the locking wall portion 37, it is positioned in its original state.

In the above, when the driving pawl 13 is protruded, the opening of the friction plate is not brought into contact with the tip of the driving pawl when it is stored as in the conventional case, and the circumference 35 is approximately the same, with the rotation center of the recoil pulley 3 as the center and passing through the center of the support shaft 14. The claw protruding protrusion 36 formed on the engagement surface 15b of the drive claw 13
Since the drive pawl 13 is brought into contact with the recoil pulley 3 and the friction plate 31, the amount of rotation of the drive pawl 13 about the support shaft 14 relative to the phase difference between the recoil pulley 3 and the friction plate 31 becomes extremely large. In other words, as is clear from FIG. 4, the farther the contact part O between the drive claw and the friction plate is and the rotation center of the drive claw, the more the drive claw projects relative to the amount of movement A of the rotation center of the drive claw.
A' is relatively small, but on the other hand, the closer the contact point O between the drive claw and the friction plate is to the center of rotation (preferably on the same circumference), the more This is because the protrusion amount B' increases.
Therefore, the engaging portion 15 of the driving claw 13 can be quickly projected radially outward by a desired amount, and the engagement with the rotating driven member can be made much smoother.

In addition, since the abutting part with the drive claw 13, that is, the protrusion 36 for protruding the claw, is formed to protrude from the tip of the drive claw 13 when it is stored and is offset toward the center of rotation of the recoil pulley 3, the friction plate is missing as in the conventional case. There is no need for the tip of the drive claw to always protrude from the section, and as shown in FIGS. The opening 39 of the recoil pulley 3 can be shielded by the outer cylindrical wall 8 of the recoil pulley 3. Therefore, the space defined by the friction plate 31 and the side surface of the recoil pulley 3 and housing the drive claw 13 is isolated from the outside, and foreign objects can be prevented from entering the drive claw 13. It is possible to reliably prevent the adhesion and intrusion of the drive claw 13, and also prevent the drive claw 13 from popping out during non-operation.

In the embodiment, a case has been described in which the protrusion 36 for protruding the claw is formed on substantially the same circumference 35 as the support shaft 14, but the position of the protrusion 36 for claw protrusion is not limited to this. If the tip of the pawl 13 is shifted toward the center of rotation of the recoil pulley 3, the same action and effect as described above can be achieved. The case where it is on the same circumference as the support shaft 14 is the maximum.

As is clear from the above description, according to the present invention,
When starting the engine, the drive claw can be quickly protruded to facilitate engagement with the rotating driven member, and when not in operation, the entire drive claw can be shielded from the outside, preventing foreign matter from entering and extending the life of the recoil starter. Furthermore, the structure is simple, the contact portion with the drive pawl can be integrally molded with the friction plate, and it can be manufactured easily.

[Brief explanation of drawings]

Fig. 1 is a plan view of the recoil starter, Fig. 2 is a plan view of the same with the friction plate removed, Fig. 3 is a cross-sectional side view of the same, Fig. 4 is the center of rotation of the claw and the protrusion amount of the drive claw. FIG. In the drawing, 2 is a support shaft member, 3 is a recoil pulley,
8 is an outer cylinder wall, 13 is a drive claw, 14 is a support shaft, 24
31 is a coil spring, 31 is a friction plate, 36 is a protrusion for protruding a claw, and 39 is an opening.

Claims (1)

[Claims] 1. A recoil pulley is rotatably fitted to a support shaft member, a drive pawl is pivotally attached to one side of the support shaft member of the recoil pulley, and a fixed member is frictionally engaged with the drive pawl so as to cover the drive pawl. A recoil starter in which a friction plate having a contact portion is disposed on the side surface of the recoil pulley so that the tip side of the drive pawl projects radially outward as the recoil pulley rotates. A recoil starter characterized in that a recoil starter is formed protruding from a friction plate near the tip side and offset from an imaginary circle that is centered on the rotation center of the recoil pulley and passes through the tip of the drive claw when stored, toward the rotation center of the recoil pulley.