KR101693036B1 - Automatic starting apparatus for small engin - Google Patents

Abstract

The present invention relates to a starter for a small engine that can be restored to its original position through a return structure after the crankshaft of the small engine is manually rotated to start the small engine and is housed in the state of being adjacent to the crankshaft; A rope reel rotatably installed in the housing to provide a rotating force; A rope which is coupled to the rope reel in a state of being rolled and has a knob to rotate the rope reel by pulling the knob; A ratchet coupled to the rope reel to rotate together with the rope reel and to be locked to the crank shaft to transmit rotational force of the rope reel to the crankshaft; And a retractor for restoring the rope reel and the rope to their original shape while being compressed by a rotational force of the rope reel and accumulating an elastic force, wherein the retractor is installed on a rotary shaft of the rope reel and rotates together with the rope reel A spur gear having a plurality of teeth formed along the periphery thereof; An elastic member which is fixed at the other end to the housing and is compressed by rotation of the spur gear to provide an elastic force while one end is connected to the spur gear; And a connecting member to which one end of the elastic member is engaged with the spur gear and which rotates and compresses one end of the elastic member while rotating by the spur gear.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a starter for a small engine,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a starter for a small engine, and more particularly, to a starter for a small engine which can be rotated to a home position by manually turning the crankshaft of the small engine to start the small engine .

Generally, small-sized engine-equipped devices such as docking type farm machinery of 50cc or less class, leisure sport equipment such as RC car and RC helicopter, and motor boat driving motor are usually equipped with a Recoil Starter There is a starter that is called.

Such a recoil starter starts the small engine through the rotational force generated on the rope reel, which is wound on the rope reel as is well known.

More specifically, the recoil starter is provided with a ratchet device for transmitting the rotational force of the rope reel to the crankshaft of the small engine, and is locked to the crankshaft through the ratchet device of the rope reel to rotate the crankshaft, After starting, it is unlocked in the crankshaft and then restored to its original state by reverse rotation of the rope reel.

Here, the recoil starter is provided with a restoring member for restoring the rope reel to its original state.

The restoring member restores the rope and the rope reel by rotating the rope reel reversely through the accumulated rotational force after starting the small engine after the rope reel accumulates the rotational force in accordance with the forward rotation of the small engine.

However, in the conventional recoil starter, since the elastic member constituting the restoring member is directly connected to the rope reel, stress is directly applied to the fixing portion of the elastic member during rotation of the rope reel, And if the fixed portion is damaged, the entire rope reel must be replaced.

For example, in Korean Patent No. 10-1217391, one end of a spiral spring used as a restoring member is directly connected to a rope reel, and in Korean Patent Publication No. 10-2014-0009187, Is directly connected to the rope reel, which may cause breakage of the rope reel by the restoring member.

In order to solve the above problems, a structure for connecting the rope reel and the elastic member through the structure of the rack gear and the pinion gear has been developed. However, the space for the reciprocating movement of the rack gear must be ensured, have.

Korean Patent No. 10-1217391 Korean Patent Publication No. 10-2014-0009187

The present invention has been made in order to overcome the problems of the prior art as described above, and it is an object of the present invention to provide a rope reel that can prevent breakage of a rope reel by connecting an elastic member, It is an object to provide a starter for a small engine.

Specifically, it is an object of the present invention to provide a starter for a small engine which can improve the durability of a rope reel by allowing the connecting member to be replaced while the fixing portion of the one end of the elastic member is constituted by the connecting member.

It is another object of the present invention to provide a starter for a small engine that can simplify a connecting structure and reduce the volume while connecting an elastic member to a rope reel through a member rotating in an inscribed state with a rotary shaft of a rope reel to be.

According to another aspect of the present invention, there is provided a starting device for starting a small engine by rotating a crankshaft of a small engine, the starting device comprising: a housing fixed to the crankshaft in an adjacent state; A rope reel rotatably installed in the housing to provide a rotating force; A rope which is coupled to the rope reel in a state of being rolled and has a knob to rotate the rope reel by pulling the knob; A ratchet coupled to the rope reel to rotate together with the rope reel and to be locked to the crank shaft to transmit rotational force of the rope reel to the crankshaft; And a retractor for restoring the rope reel and the rope to their original shape while being compressed by a rotational force of the rope reel and accumulating an elastic force, wherein the retractor is installed on a rotary shaft of the rope reel and rotates together with the rope reel A spur gear having a plurality of teeth formed along the periphery thereof; An elastic member which is fixed at the other end to the housing and is compressed by rotation of the spur gear to provide an elastic force while one end is connected to the spur gear; And a connecting member to which one end of the elastic member is engaged with the spur gear and which rotates and compresses one end of the elastic member while rotating by the spur gear.

For example, the connecting member may include: a rotating shaft installed in the housing in a state adjacent to the spur gear; A spur gear rotatably coupled to the rotating shaft and having an arc-shape about the rotating shaft, the slot being rotatably received in the spur gear, the spur gear being engaged with the spur gear in an inscribed state, An internal gear rotated about the rotation axis by rotation of the spur gear; And a fixing protrusion protruding from a part of the internal gear to form a fixing part for fixing one end of the elastic member and rotating about the rotation axis together with one end of the elastic member by rotation of the internal gear Lt; / RTI >

For example, the elastic member is inserted into the rotation shaft through a circularly wound coil part, and one end extending from the coil part is fixed to the fixing protrusion to form a free end, and the other end part extending from the coil part And a torsion spring fixed to the housing to form a fixed end.

Alternatively, the elastic member may include a plate spring formed of a plate member bent in a V-shape, fitted to the rotation shaft through a bent portion and fixed at one end thereof to the fixing protrusion and having the other end fixed to the housing, .

The elastic member may be a spiral spring formed in a spiral shape and having one end fixed to the fixing protrusion and having a free end and the other end fixed to the rotating shaft to form a fixed end have.

Alternatively, the connecting member may be fixed to the housing while being adjacent to the spur gear, a rotating shaft constituting a connecting portion of the elastic member, A spur gear rotatably coupled to the rotating shaft and having an arc-shape about the rotating shaft, the slot being rotatably received in the spur gear, the spur gear being engaged with the spur gear in an inscribed state, An internal gear rotated about the rotation axis by rotation of the spur gear; And a spring holder which is formed in the shape of a groove in the internal gear to receive one end of the elastic member while providing a coupling portion of the rotation shaft and to rotate one end of the elastic member by rotation of the internal gear It is possible.

The rope track includes a rope track formed in a spiral groove shape along an outer circumferential surface of the rope track so that the rope is sequentially wound. The rope track has an outer diameter gradually increasing from the knob side of the rope toward the end side of the rope It is preferable to narrow it.

According to the starter for a small engine according to the present invention, stress caused by the elastic member is not directly applied to the rope reel as one end of the elastic member constituting the retarer is compressed by the connecting member without being directly compressed by the rope reel Breakage of the rope reel is prevented, and durability can be improved.

Particularly, according to the present invention, since the fixing protrusion is protruded from the internal gear constituting the connecting member and the one end of the elastic member is fixed, it is possible to replace the internal gear so that it is unnecessary to replace the entire rope reel, have.

Further, according to the present invention, since the internal gear is coupled with the spur gear in the inscribed state and the elastic member is compressed through the rotational movement instead of the linear movement, the working space according to the linear movement can be omitted.

Further, the present invention can be applied to various types of elastic members, and as the diameter of the rope track formed on the rope reel gradually narrows, the rope reel can rotate smoothly even with a small force at the initial stage of starting, The number of revolutions of the rope reel increases, so that the start of the small engine is easy.

1 is a perspective view showing a starter for a small engine according to the present invention;
2 is an exploded perspective view showing a starter for a small engine according to the present invention.
3 is a perspective view showing a retractor which is a main part of the present invention.
4 is a front view showing the retiner of the present invention.
Fig. 5 is a front view showing an operating state of the retiner shown in Fig. 4; Fig.
Fig. 6 is a front view showing another embodiment of the elastic member shown in Fig. 4; Fig.
Fig. 7 is a front view showing another embodiment of the elastic member shown in Fig. 4; Fig.
8 is a side view showing the rope reel of the present invention.
Fig. 9 is an exploded perspective view showing another embodiment of the connecting member shown in Fig. 3; Fig.

Hereinafter, embodiments of the present invention will be described in more detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted.

Embodiments in accordance with the concepts of the present invention can make various changes and have various forms, so that specific embodiments are illustrated in the drawings and described in detail in this specification or application. It is to be understood, however, that it is not intended to limit the embodiments according to the concepts of the present invention to the particular forms of disclosure, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between. Other expressions that describe the relationship between components, such as "between" and "between" or "neighboring to" and "directly adjacent to" should be interpreted as well.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, the terms "comprises ", or" having ", or the like, specify that there is a stated feature, number, step, operation, , Steps, operations, components, parts, or combinations thereof, as a matter of principle.

The starting device for a small engine according to the present invention includes a housing 100, a rope reel 200, a rope 300, a ratchet 400 and a retiner 500 as shown in Figs. 1 and 2 .

The housing 100 is formed as a cylindrical body having a housing space with one side opened, as shown in FIG. 2, to receive a component to be described later, .

That is, the housing 100 faces the crankshaft of the small engine through the opening while being fixed to a small agricultural machine, a leisure mechanism or the like.

In addition, the housing 100 is formed with a draw-out hole 110 through which a rope 300 to be described later is drawn out.

3, the housing 100 includes a reel rotary shaft 150 to which a rope reel 200 is coupled, a rotary shaft 531 to which an internal gear 532 to be described later is coupled, And a housing protrusion 533a to which the other end of the housing protrusion 520 is fixed.

2, the rope reel 200 is rotatably installed on the reel rotary shaft 150 of the housing 100 to form a rope 300 (see FIG. 2) And rotates the crankshaft through the ratchet 400 described later, and accumulates the rotational force through the retractor 500, which will be described later.

As shown in FIG. 2, the rope reel 200 includes a rope track 210 having a spiral groove shape along the outer circumferential surface thereof to provide a winding portion of the rope 300.

The rope 300 is a component for applying a rotational force to the rope reel 200. The rope reel 200 is wound around the rope track 210 of the rope reel 200 with one end thereof fixed to the rope reel 200, The other end is drawn out by the hole 110 and the rope reel 200 is rotated as the handle 310 provided at the other end is pulled.

The rope 300 may be made of, for example, cotton, hemp, or synthetic fiber, and may be formed of a wire formed by twisting a steel wire with a core to increase the strength.

8, the rope track 210 of the rope reel 200 is preferably formed so that its outer diameter gradually decreases from the side of the handle 310 of the rope 300 to the end side thereof.

That is, since the outer diameter of the rope track 210 on the side of the handle 310 is the largest, a large rotational force can be obtained even with a small force, and since the outer diameter of the end side of the rope 300 is the smallest, A large number of revolutions can be obtained.

Accordingly, the rope reel 200 is smoothly rotated by a small force at the initial stage of rotation while being rotated by the pulling of the rope 300, and at the end of the starting period, the rope reel 200 is rotated at a large number of revolutions.

The ratchet 400 is a component that is coupled to the rope reel 200 and transfers the rotational force of the rope reel 200 to the unshown crankshaft or is separated from the crankshaft after starting.

Specifically, the ratchet 400 is coupled to the front of the rope reel 200 as shown in FIGS. 1 and 2, and is locked with the crankshaft while rotating in parallel with the rope reel 200 to start the small engine, Locked with the rope reel 200 after being unlocked in the crankshaft.

Such a ratchet 400 may be applied to a configuration applied to a conventional recoil starter.

For example, the ratchet 400 may include a pair of extension protrusions 410 coupled to the rope reel 200 as shown in FIG. 2, and the extension protrusion 410 may be rotated by the rotation of the rope reel 200, Respectively, so as to be locked while being caught by the crankshaft.

Alternatively, the ratchet 400 may be configured to have a slider structure that protrudes forward of the rope reel 200 by rotation of the rope reel 200, and is locked while being caught by the crank shaft through the protrusion of the slider.

Here, the detailed configuration of the ratchet 400 is well known in the art to which the present invention belongs, and therefore, detailed description thereof will be omitted.

The retractor 500 is a component for restoring the rope reel 200 and the rope 300 after the start of the engine by restoring the elastic force through the rotational force of the rope reel 200.

For example, the retractor 500 may include a spur gear 510, an elastic member 520, and a connecting member 530 as shown in Fig.

3, the spur gear 510 is fixed to the rotation center of the rope reel 200 while forming a spur gear through a plurality of teeth formed along the periphery thereof. 150 together with the rope reel 200 and rotates together with the rope reel 200.

The elastic member 520 accumulates the elastic force while being compressed by the rotation of the spur gear 510 rotating together with the rope reel 200 and rotates the spur gear 510 in the reverse direction through the elastic force after starting the engine, 200 and the rope 300 to their original state.

The other end portion 523 of the elastic member 520 is fixed to the housing 100 with one end portion 522 connected to the spur gear 510 through a connecting member 530 to be described later, And one end portion 522 is moved by the rotation of the spur gear 510 to elastically compress and accumulate the rotational force of the rope reel 200.

Hereinafter, specific examples of the elastic member 520 will be described later.

The connecting member 530 connects the spur gear 510 and the elastic member 520 while connecting the spur gear 510 and the spur gear 510. The spur gear 510 rotates by the spur gear 510, And one end of the member 520 is rotated to elastically compress the component.

The connecting member 530 may include a rotating shaft 531, an internal gear 532, and a fixing protrusion 533 as shown in Figs. 2 and 3, for example.

The rotation shaft 531 constitutes a coupling portion of an internal gear 532 to be described later and is formed to protrude from the housing 100 in a state adjacent to the spur gear 510 as shown in FIG.

4, the rotation shaft 531 rotates about the spur gear 510, which is the rotation center of the rope reel 200, and the internal gear 532, which will be described later, is disposed adjacent to the spur gear 510 And rotates around the rotating shaft 531 forming the state.

4, the internal gear 532 is rotatably coupled to the rotating shaft 531 and is engaged with the spur gear 510 in an inscribed state so that the internal gear 532 is rotated about the rotating shaft 531 by the rotation of the spur gear 510 Rotate.

3, the internal gear 532 is formed with an arc-shaped slot 532a passing through the rotation shaft 531 and rotatably receiving the spur gear 510, and the slot 532a The spur gear 510 is engaged with the spur gear 510 in an inscribed state and rotates about the rotating shaft 531 by the rotation of the spur gear 510. [

Here, the internal gear 532 may be guided by the guide rail 532b formed through the slot 532a while being guided by the reel rotary shaft 150 as shown in FIG.

4, the fixing protrusion 533 is integrally formed with a part of the internal gear 532 to form a fixing portion of the one end of the elastic member 520, and the internal gear 532 and the internal gear 532 are fixed as shown in FIG. And rotates and compresses one end of the elastic member 520 while rotating together.

That is, one end of the elastic member 520 is not directly fixed to the rope reel 200 but is fixed to the fixing protrusion 533 of the internal gear 532 and is rotated by the rotation of the rope reel 200 and the spur gear 510 The internal gear 532 is elastically compressed while being pressed through the fixing protrusion 533 which rotates together with the internal gear 532 to accumulate part of the rotational force of the rope reel 200, So as to return the rope reel 200.

The elastic member 520 may be constituted by a torsion spring 520a as shown in Figs. 4 and 5, for example.

The torsion spring 520a is inserted into the rotation shaft 531 through the circular coil portion 521 and is coupled to the one end portion 522 to be fixed to the fixing protrusion 533 to form a free end, The other end 523 is fixed to the housing projection 533a protruding from the housing 100 and is compressed by rotation of the internal gear 532 and the fixing protrusion 533. [

Meanwhile, the elastic member 520 may be formed of a leaf spring 520b as shown in FIG.

The plate spring 520b is formed of a plate member bent in a V shape and is engaged with the rotation shaft 531 through the bent portion 524 so that the one end portion 522 is fixed to the fixing protrusion 533. [ And the other end 523 is fixed to the housing protrusion 533a to be a fixed end and is compressed by rotation of the internal gear 532 and the fixing protrusion 533. [

Alternatively, the elastic member 520 may be constituted by a spring 520c as shown in FIG.

The spring 520c is formed in a spiral shape so that one end 522 of the outer ring is free to be fixed to the fixing protrusion 533 and the other end 523 of the center is fixed to the rotating shaft 531, It forms a stage.

As the internal gear 532 is rotated by the rotation of the rope reel 200 and the spur gear 510, the one end portion 522 is rotated together with the fixing protrusion 533 to be tightened and compressed .

The spring 520 is released by the resilient force of the engine after starting the engine and one end 522 reversely rotates the fixing protrusion 533 and the internal gear 532 to return the rope reel 200.

9, the connecting member 530 may include a rotating shaft 531, an internal gear 532, and a spring holder 537, as shown in FIG.

Here, since the rotary shaft 531 and the internal gear 532 are constructed in the same manner as described above, detailed description is omitted.

That is, another embodiment of the connecting member 530 is different in that the spring holder 537 is configured instead of the fixing projection 533 described above.

9, the spring holder 537 is formed as an identical groove in a part of the internal gear 532 to receive the rotary shaft 531 and the one end portion 522 of the elastic member 520, 532 to rotate the one end 522 of the elastic member 520 to compress it.

More specifically, the spring holder 533 is formed by a groove for receiving the coil portion 521 and the end portion 522 of the torsion spring constituting the elastic member 520 to provide a joining portion of the rotation shaft 531, And rotates one end 522 of the elastic member 520 when the gear 532 rotates.

The other end portion 523 of the elastic member 520 is fixed to the spring holder 533 of the internal gear 532 without being directly fixed to the rope reel 200 and the housing protrusion 533a And is elastically compressed while being pressed through a spring holder 533 that rotates together with the internal gear 532 by the rotation of the rope reel 200 and the spur gear 510 so that a part of the rotational force of the rope reel 200 And returns the rope reel 200 by reversing the internal gear 532 through the elastic force accumulated after the start of the engine.

The operation and operation of the present invention including the above-described components will be described.

At start-up of the small engine, the user pulls the handle 310 of the rope 300 to rotate the rope reel 200.

At this time, since the outer diameter of the rope reel 200 is gradually narrowed, the rope reel 200 smoothly rotates initially with a small force and increases the number of revolutions at the end.

As the rope reel 200 rotates, the ratchet 400 rotates the crank shaft through the rotational force of the rope reel 200 to start the engine while being locked to the crankshaft of the engine, and is separated from the crankshaft after the start of the engine.

The spur gear 510 constituting the retractor 500 rotates the internal gear 532 and the fixing protrusion 533 while rotating together with the rope reel 200 on the other side of the ratchet 400, The one end portion 522 is compressed while rotating by the fixing protrusion 533 to accumulate the elastic force.

After the start of the engine, the elastic member 520 reversely rotates the fixing projections 533 and the internal gear 532 through elastic force.

Thus, the rope reel 200 is returned together with the rope 300 while being reversely rotated by the internal gear 532 and the spur gear 510.

As described above, in the starter for a small engine according to the present invention, the one end portion 522 of the elastic member 520 constituting the retiner 500 is not directly compressed by the rope reel 200, The stress caused by the elastic member 520 is not directly applied to the rope reel 200, so that breakage of the rope reel 200 can be prevented and durability can be improved.

Since the fixing protrusion 533 protrudes from the internal gear 532 constituting the connecting member 530 and the one end of the elastic member 520 is fixed, the internal gear 532 can be replaced, It is unnecessary to exchange the whole, and the maintenance cost can be reduced.

In addition, since the internal gear 523 is coupled with the spur gear 510 in an inscribed state and compresses the elastic member 520 through the rotational motion instead of the linear motion, the working space due to the linear motion can be omitted, It is possible to reduce the size of the display device 100.

As the diameter of the rope track 210 formed on the rope reel 200 is gradually narrowed, the rope reel 200 can smoothly rotate with a small force at the initial stage of the starting operation. Further, The number of revolutions of the small engine is increased.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be apparent to those skilled in the art that various changes, substitutions, and alterations can be made therein without departing from the spirit of the invention.

100: housing 110:
200: rope reel 210: rope track
300: Rope 310: Handle
400: ratchet 410: extension projection
500: Retainer 510: Spur gear
520: elastic member 520a: torsion spring
520b: leaf spring 520c: spring-loaded spring
521: coil part 522: one end part
523: the other end portion 524:
530:
531: rotating shaft 532: internal gear
532a: Slot 533: Fixing projection
533a: housing projection

Claims (7)

A starting device for starting a small engine by rotating a crankshaft of a small engine,
A housing fixed adjacent to the crankshaft;
A rope reel rotatably installed in the housing to provide a rotating force;
A rope which is coupled to the rope reel in a state of being rolled and has a knob to rotate the rope reel by pulling the knob;
A ratchet coupled to the rope reel to rotate together with the rope reel and to be locked to the crank shaft to transmit rotational force of the rope reel to the crankshaft; And
And a retractor for restoring the rope reel and the rope while restoring the elastic force by being compressed by the rotational force of the rope reel,
The retractor includes:
A spur gear provided on a rotary shaft of the rope reel, rotated together with the rope reel, and having a plurality of teeth formed along the periphery thereof;
An elastic member which is fixed at the other end to the housing and is compressed by rotation of the spur gear to provide an elastic force while one end is connected to the spur gear; And
And a connecting member for fixing one end of the elastic member in a state of being engaged with the spur gear and rotating the one end of the elastic member while rotating by the spur gear,
The connecting member includes:
A rotating shaft installed in the housing adjacent to the spur gear;
A spur gear rotatably coupled to the rotating shaft and having an arc-shape about the rotating shaft, the slot being rotatably received in the spur gear, the spur gear being engaged with the spur gear in an inscribed state, An internal gear rotated about the rotation axis by rotation of the spur gear; And
And a fixing protrusion protruding from a part of the internal gear to form a fixing part for fixing one end of the elastic member and rotating about the rotation axis together with one end of the elastic member by rotation of the internal gear Characterized in that the starting device for a small engine.
delete The method according to claim 1,
The elastic member
And one end portion extending from the coil portion is fixed to the fixing protrusion to form a free end while the other end portion extending from the coil portion is fixed to the housing, And a torsion spring which forms the torsion spring.
The method according to claim 1,
The elastic member
And a plate spring formed of a plate member bent in a V shape and fitted to the rotation shaft through a bent portion and having one end fixed to the fixing projection and having the other end fixed to the housing, Starter.
The method according to claim 1,
The elastic member
And a spiral spring formed in a helical shape and having one end fixed to the fixing protrusion and having a free end and the other end fixed to the rotating shaft to form a fixed end, .
The method according to claim 1,
The connecting member includes:
A rotating shaft which is fixed to the housing while being in a state adjacent to the spur gear, and which forms an engagement portion of the elastic member;
A spur gear rotatably coupled to the rotating shaft and having an arc-shape about the rotating shaft, the slot being rotatably received in the spur gear, the spur gear being engaged with the spur gear in an inscribed state, An internal gear rotated about the rotation axis by rotation of the spur gear; And
And a spring holder which is formed in a groove shape in the internal gear to accommodate one end portion of the elastic member while providing an engagement portion of the rotation shaft and rotates the one end portion of the elastic member by rotation of the internal gear. A starter for a small engine.
The method according to claim 1,
The rope reel includes:
And a rope track formed in a spiral groove shape along an outer circumferential surface and sequentially winding the rope,
The rope track,
And the outer diameter of the rope gradually decreases toward the end side of the rope from the grip side of the rope.

Images