JPS6065274A - Recoil starter - Google Patents

Abstract

PURPOSE:To allow a driving hook to be speedily protruded or accommodated, by allowing the contact part of said driving hook to project onto a friction plate, positioned in eccentricity close to the center of revolution of a recoil pulley from a supposed circle which has, as center, the center of revolution of the recoil pulley and passes through the top edge of the driving hook on accommodation. CONSTITUTION:Inner and outer cylinder wall parts 7 and 8 are formed onto the side surface of a recoil pulley 3, and a cut part 11 is formed onto a part of the top edge part of the outer cylinder wall part 8, and a driving hook 13 is pivotally installed onto the supporting shaft 14 on the wall part close to the cut part 11. The driving hook 13 and the pulley 3 are integrally turned by pulling a recoil rope 5, and a friction plate 31 engaged through friction generates a phase difference between the pulley 3, and the engagement surface 15b of the driving hook 13 is engaged with the projection part 36 on the side-surface part of the friction plate, and the engagement part 15 of the driving hook 13 projects outside the diameter from an opened port 39, guided by the projection part 36, and engaged with a revolved member, and then the engine is started. After the start, the driving hook 13 is accommodated by the revolution of the revolved member, and thus intrustion of foreign material is prevented.

Description

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

Conventionally, this type of coil starter generally includes a coil pulley that is rotatably fitted to a support shaft member and has a groove for winding the recoil rope, and a drive pawl that is pivotally attached to the side surface of the recoil pulley via a support shaft. The outer edge of the friction plate is bent toward the coil pulley side, and an entry portion is provided in the bent portion of the outer edge. The tip of the drive claw is always slightly protruding from the top. Then, when the engine is started, the recoil rope is pulled to rotate the recoil pulley, and due to the phase difference between the friction plate and the coil pulley, the drive pawl protrudes radially outward at the input section, which drives the rotating driven member connected to the engine side. By engaging the pawl, the rotation of the recoil pulley is transmitted to the engine side, making it difficult to start 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.
As mentioned above, it is difficult to say that the driving pawl rotates quickly around the spindle if the tip of the driving pawl is simply engaged with the entry part as the abutting part, and the diameter of the driving pawl and the coil pulley Difficult to protrude outward quickly 0 In addition, especially for IJ coil starters attached to small engines such as power tillers, if the drive pawl is constantly protruding from the friction plate, dirt, dust, etc. There is also a risk that foreign matter such as dust may adhere to the drive pawl, or that foreign matter may enter the inside through the inlet of the friction plate, reducing 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 protrude quickly by a predetermined amount due to the rotation of the recoil pulley, and furthermore, to cause the drive pawl to protrude by a predetermined amount quickly when the recoil pulley rotates. This is the origin of a recoil starter whose claw can be housed within a friction plate.

In order to achieve the above-mentioned object, the present invention deviates from an imaginary circle centered on the rotation center of the recoil pulley and passing through the tip of the drive claw when stored, to a position closer to the rotation center of the recoil pulley. It is characterized by a protrusion formed on the friction plate.

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

Fig. 1 shows a plan view of the beam coil starter, Fig. 2 shows a plan view of the same with the friction plate removed, and Fig. 3 shows a cross-sectional side view of the same.

Reference numeral 1 designates a starter case. Inside the starter case 1, a cylindrical support shaft member 2 is fixed to the husband. A coil pulley 3 is rotatably fitted to the support shaft member 2, and the starter case 1 and the recoil pulley 3 are connected. Return movement of the silicon coil pulley 3 is freely formed by a return spring 4 provided between the side surfaces.

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

Previous: A cutout portion 11 is formed in a part of the tip edge portion of the outer tube wall portion 8, and a wall portion connects eight locations of the outer tube wall portion facing the cutout portion 11 and the inner tube wall portion 7. 12 will be provided.

The drive claw 13 is pivotally attached to a support shaft 14 protruding from the wall portion 12, and a part of the drive claw 13 is attached to the cutout portion 11 as shown in FIGS. 2 and 3. establish.

The driving pawl 13 has an elongated shape with its middle portion pivotally connected to a support shaft 14, and one side lip portion extending from the support shaft 1'4 is capable of freely engaging with a rotating driven member (not shown). The distal edge portion 15a of the engaging portion 15 is formed so as to substantially match the outer circumferential ring range of the outer cylinder wall portion 8 when the driving pawl 13 is retracted, as shown by the solid line in FIG. , and the outer cylinder wall 8 and the inner cylinder wall 7
The inner edge portion between the two is formed as a retaining surface 15b.

The other side portion of the drive claw "13 extending from the support shaft 14 is
When the engaging portion 15 and the rotating driven member are engaged, the driving claw 13
The outer edge portion 016a of the locking portion 16 is formed to substantially match the outer circumference □ contour of the outer cylinder wall portion 8 when the drive claw 13 is stored, as described above. , and the inner edge portion has a locking surface 1 that can freely match the receiving portion 7a of the inner cylinder part 7.
6b.

A bolt 22 is provided protrudingly on the top surface of the support shaft part powder 2 through a nut 21 fixed to the support shaft member 2, and the body part end of the bolt 22 and the top surface of the support shaft member 2 are connected to each other. A bottom plate 23 is fixed to the inside of the cylinder wall 7, and a coil spring 724 is provided with one end frictionally engaged with the bottom plate 23.

The friction plate 31 is disposed with its center portion 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 inner peripheral portion of the coil spring 24 (at the tip and near the tip). At the same time, the bolt 22 is frictionally engaged with a washer 32 disposed on the lower surface of the head of the bolt 22.

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

□ On the side surface portion 33, the driving claw 15 is provided on approximately 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 protrusion 36 for protruding a claw is formed in a bulging manner so that it can freely come into contact with the
Further, a locking protrusion 38 which can freely come into contact with the locking wall 37 connecting the outer cylinder wall 8 and the inner cylinder wall 7 is formed in a bulging manner and is spaced apart from the projection 36. An opening 39 for the driving claw 15 to come out to the east is provided in the vicinity of the claw protrusion protrusion 36 in the cylindrical portion 34.

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 frictionally engaged with the coil spring 24 and washer 32, a phase difference is generated with the recoil pulley 3, and the engagement surface 15b of the drive pawl 13 engages with the protrusion 36, causing the protrusion The engaging portion 15 of the driving claw 13 is guided by the opening 39
It protrudes radially outward from the shaft and engages with the rotating driven member to start the engine.

After the engine starts, the drive claw 13 is rotated by the rotation of the rotating driven member.
is stored, or is stored in contact with the edge of the opening 39 when the recoil pulley 3 is returned by the return spring 4,
The friction plate 31 and the recoil pulley 3 are connected to the protrusion 38 and the locking wall 3
7, it is positioned in its original state.

In the above, when the driving pawl 13 is protruded, the opening of the friction plate does not come into contact with the tip of the driving pawl when it is stored, as in the conventional case, and the circumference is approximately the same as the circumference that passes through the center of rotation of the recoil pulley 3 and the center of the support shaft 14. Since the claw protrusion protrusion 36 formed on the drive claw 35 comes into contact with the engaging portion 15b of the drive claw 13, the drive claw 13 is adjusted around the support shaft 14 in response to the phase difference between the recoil pulley 3 and the friction plate 31. The amount of rotation is extremely off. As is clear from FIG. 4, the farther apart the abutting portion 0 of the drive claw and the friction plate is from the center of rotation of the drive claw, the more the protrusion amount A' of the drive claw is relative to the amount of movement A of the center of rotation of the drive claw. is relatively small, but on the other hand, the closer the contact part ○ between the drive claw and the friction plate is to the center of rotation (preferably on the same circumference), the more the protrusion amount of the drive claw becomes relative to the amount of movement B of the center of rotation of the drive claw. This is because B becomes larger. 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 deviated toward the center of rotation of the coil boo 93, the protrusion of the friction plate as in the conventional case is formed. There is no need for the tip of the drive claw to always protrude from the part, 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 blocked from the outside, and foreign objects are prevented from entering the drive claw 13. Adhesion and intrusion can be reliably prevented, and the driving claw 13 can also be prevented from popping out during non-operation.

In the embodiment, the case where the claw protrusion protrusion 36 is formed on the substantially same circumference 35 as the support shaft 14 is explained, however, the position of the claw protrusion protrusion 36 is not limited to this, and the position is not limited to this. If the tip of the drive claw 13 is shifted toward the center of rotation of the coil boob 93, 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 the engine is started, the drive pawl is quickly projected to facilitate engagement with the rotating driven member, and when the engine is not in operation, the entire drive pawl is shielded from the outside. It is possible to prevent foreign matter from entering and increase the durability of the recoil starter. Furthermore, the structure is simple, and the part that contacts the drive claw can be integrally molded with the friction plate, making it easy to manufacture. Demonstrates excellent effects.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the beam coil 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 rotation center of the pawl and the protrusion of the drive pawl. 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 pawl, 14 is a support shaft, 24 is a coil spring, 31 is a friction plate, 36 is a protrusion for protruding the pawl, 39 is an aperture. Patent applicant Matsuyama Seisakusho Co., Ltd. Agent Patent attorney 2 1) Toyo Ichikan Patent attorney Kuni Ohashi 9 Patent attorney Yu Koyama Figure 1 Figure 2 Figure 3 Figure 4 □ - 80th solicitation 1 tun-

Claims (1)

[Claims] A recoil pulley is rotatably fitted to the support shaft member, a drive pawl is pivotally attached to the side surface of the recoil pulley, and a fixed member is frictionally engaged to cover the drive pawl to recoil a friction plate having a contact portion with the drive pawl. It is arranged on the side of the pulley so that the drive claw protrudes radially outward when the recoil pulley rotates, or in a coil starter, the abutment part is centered around the rotation center of the recoil pulley and passes through the tip of the drive claw when stored. A recoil starter characterized by a friction plate protruding from a virtual circle toward the center of rotation of a recoil pulley.