JP2515136Y2 - Engine starter - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a starting device for a small engine such as a portable engine.

[0002]

2. Description of the Related Art A conventional starting device of this type is shown in FIG.
Is disclosed in Japanese Utility Model Publication No. Sho 63-18347.
(See Japanese Patent Publication No. 5).

In this starting device, a starter motor 1 and a recoil starter 3 are arranged side by side, and a crankshaft 5 driven by a piston of an engine body (not shown).
Is pivotally supported by the crankcase 7. A starter case 9 is attached to the crank case 7, and a recoil pulley 1 is attached to a support shaft 11 fixed to the starter case 9.
3 is rotatably mounted. A part of the recoil pulley 13 is provided in a cylindrical shape along the outer periphery of the support shaft 13,
The first one-way clutch 1 is provided on the outer circumference of the protruding portion.
A rotor gear 17 is attached via 5.

An intermediate shaft 19 is fixed to the starter case 9, and a small gear 21 meshing with the rotor gear 17 is mounted on the intermediate shaft 19 via a second one-way clutch 23, and a drive shaft for the starter motor 1 is provided. A gear 29 that meshes with a motor gear 27 provided on the reference numeral 25 is rotatably mounted.

A rotor 31 having a ratchet 33 is attached to an end portion of the crankshaft 5, and a locking piece 35 is provided on the rotor gear 17 so as to project from the ratchet 31 so as to be disengageable from the ratchet 31.

According to such a starting device, even when the power supply battery (not shown) of the starter motor 1 is discharged,
The engine can be started by the recoil starter 3, and the rotor 31 such as a cooling fan can be easily attached to the end of the crankshaft 5.

[0007]

However, in such a conventional starting device, since the rotor gear and the small gear rotate together with the recoil pulley at the time of starting with the recoil pulley, the resistance applied to the recoil pulley is large. Therefore, the starting operability may be deteriorated.

Further, the second one-way clutch must be mounted on the intermediate shaft, which makes it difficult to downsize the device near the intermediate shaft.

The present invention was made in order to solve such a conventional problem, and the purpose thereof is to make it possible to selectively use a starter motor and a recoil starter, such as a fan. It is an object of the present invention to provide an engine starting device that can be easily mounted and can be downsized without deteriorating the starting operability.

[0010]

In order to achieve the above object, an engine starter according to the present invention is provided with a deceleration case on one side of a crankcase, and the deceleration case is rotatably supported by an intermediate gear by a starter motor. A reduction gear for a starter motor that can be driven through is provided, a concentric cavity portion is provided in the reduction gear, and a cylindrical shaft having a hollow portion and interlockingly connected to a crankshaft is provided in the cavity portion. Attached via the one-way clutch of, in the hollow part of this cylindrical shaft,
A rotating shaft is mounted via a second one-way clutch, and a recoil pulley for a recoil starter, which is rotatably supported on the speed reduction case side, is interlockingly connected to the rotating shaft.

[0011]

When the cell motor is driven, the crankshaft is driven from the intermediate gear through the reduction gear, the first one-way clutch, and the cylindrical shaft, and when the recoil starter is driven, the recoil pulley for the recoil starter rotates to the rotary shaft, The crankshaft is driven via the two one-way clutch and the cylindrical shaft. Here, when the cylindrical shaft is driven by the reduction gear, the rotation shaft does not rotate by the second one-way clutch, and conversely, when the cylindrical shaft is driven by the rotation shaft, the rotation speed is reduced by the first clutch. Gear does not rotate. That is, the reduction gear, the cylindrical shaft, the rotation shaft, the first one-way clutch, and the second one-way clutch housed in the cavity selectively and efficiently drive the starter motor and the recoil starter to the crankshaft. Acts as a transmission mechanism to convey.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. The same parts as those in the conventional example are designated by the same reference numerals, and the description thereof will be omitted.

FIG. 1 is a sectional view of an engine starting device according to an embodiment of the present invention.

A deceleration case 37 is attached to the crankcase 7,
Recoil cases 39 are attached to the deceleration cases 37 by bolts (not shown). The crankshaft 5 is pivotally supported by the crankcase 7 via a bearing 41.

The deceleration case 37 includes the crankshaft 5
A mounting hole 49 that is concentric with the shaft core extension is formed, and a reduction gear 51 is rotatably mounted in the mounting hole 49 via a bearing 53 such as a bush or a needle bearing. An intermediate shaft 19 is fixed in the deceleration case 37, and an intermediate gear 47 in which a large gear portion 43 and a small gear portion 45 are integrated is rotatably attached to the intermediate shaft 19.

A starter motor 1 is attached to the crankcase 7, and a motor gear 27 is fixed to a drive shaft 25 of the starter motor 1. The reduction gear 51 is the intermediate gear 47.
And the motor gear 27 is the intermediate gear 4
7 and the large gear parts 43 of 7 respectively.

At the inner diameter of the reduction gear 51, the reduction gear 51
A cavity 55 is formed concentrically with. A hollow portion 59 is provided in the cavity 55 via a first one-way clutch 57.
A cylindrical shaft 61 having a rotary shaft 65 is mounted in the hollow portion 59 of the cylindrical shaft 61 via a second one-way clutch 63.

A flange portion 67 is formed on the side surface of the cylindrical shaft 61 inside the deceleration case 37 toward the outer peripheral direction. A locking projection 69 is provided on one end of the rotary shaft 65, and a bolt 71 is formed on the other end. The locking protrusion 69 is locked to the peripheral edge of the hollow portion 59 of the flange 67, and the intermediate rotating body 73 is attached to the bolt portion 71 from the outside of the reduction gear case 37. The intermediate rotating body 73 is
The rotation shaft 65 is fixed to the rotation shaft 65 by the nut 75.
Rotate with. During this rotation, the flange portion 67
Since a predetermined space is maintained between the intermediate rotating body 73 and the intermediate rotating body 73, movement of the reduction gear 51, the first one-way clutch 57, and the second one-way clutch 63 in the axial direction is restricted.

The first one-way clutch 57 and the second one-way clutch 63 both transmit power only in the same rotation direction and do not transmit power in the opposite rotation direction. When the rotation speed of the rotation shaft 65 is higher than that of the rotation shaft 65, the rotation of the reduction gear 51 is transmitted to the cylindrical shaft 61. Conversely, when the rotation speed of the rotation shaft 65 is faster than that of the reduction gear 51, the rotation of the rotation shaft 65 is rotated. Is the cylindrical shaft 6
It is transmitted to 1.

The intermediate rotor 73 is housed in the recoil case 39, and a locking piece 79, which is a driven portion of the first clutch 77, is provided on the outer side surface of the intermediate rotor 73 so as to project therefrom. Further, in the recoil case 39, a recoil pulley 13 for a recoil starter that winds the index string 81 is rotatably attached to the support shaft 83, and is biased by a spiral spring 85 in a direction of winding the index string 81. There is. On the side surface of the recoil pulley 13, a swing arm 87, which is a drive unit of the first clutch 77, is provided so as to be disengageable from a locking piece 79.

A fan 89 for cooling is provided at the end of the crankshaft 5 protruding into the deceleration case 37, and the fan 89 is provided with a ratchet 93 which is a driven part of the second clutch 91. . Further, on the flange portion 67 of the cylindrical shaft 61, a locking piece 95, which is a drive portion of the second clutch 91, is projectably provided on the ratchet 93 so as to be disengageable.

In such a structure, when the starter motor 1 is driven, the reduction gear 51 rotates via the drive shaft 25, the motor gear 27, and the intermediate gear 47, and this rotation causes the first rotation.
Is transmitted to the cylindrical shaft 61 via the one-way clutch 57. As a result, the crankshaft 5 rotates via the second clutch 91 and the fan 89, and the engine starts. At this time, since the rotating shaft 65 is maintained in the stopped state by the second one-way clutch 63, the resistance applied at the time of starting can be suppressed to a low level, and high starting efficiency can be obtained.

On the other hand, the index string 81 of the recoil starter 3
When a handle (not shown) provided at the end of the rotary shaft is pulled, the recoil pulley 13 rotates against the spiral spring 85, and the rotary shaft 65 rotates from the first clutch 77 through the intermediate rotating body 73. Are transmitted to the cylindrical shaft 61 via the second one-way clutch 63. As a result, the crankshaft 5 rotates via the second clutch 91 and the fan 89, and the engine starts. At this time, the reduction gear 51
Is maintained in the stopped state by the first one-way clutch 57, the resistance applied to the recoil pulley 13 is reduced, and high starting efficiency and starting operability are obtained.

When the engine is started by the starter motor 1 or the recoil starter 3, driving of the starter motor 1 and the recoil starter 3 is stopped. At this time, the cylindrical shaft 61 is maintained in a stopped state by the second clutch 91,
Further, since the fan 89 rotates together with the crankshaft 5, the temperature inside the deceleration case 37 is suppressed from rising and the occurrence of seizure or the like is prevented.

As described above, according to this embodiment, the starter motor 1 and the recoil starter 3 can be selected and used, the fan 89 and the like can be easily attached, and the resistance applied at the time of starting can be increased. Is reduced,
High starting efficiency and starting operability can be obtained.

The starter motor 1 and the recoil starter 3 are also provided.
A cylindrical shaft 61, a rotary shaft 65, a first one-way clutch 57, and a second one-way clutch 63, which are transmission mechanisms for selectively transmitting the drive from the
Since the reduction gear 51 is housed in the hollow portion 55 of the reduction gear, the size of the device can be reduced.

[0027]

As described above, according to the present invention, it is possible to easily attach a fan or the like to a starting device in which a starter motor and a recoil starter are arranged side by side, and to downsize the device. High starting efficiency and starting operability can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of an engine starting device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a conventional engine starting device.

[Explanation of symbols]

 1 Cell Motor 3 Recoil Starter 5 Crank Shaft 7 Crank Case 13 Recoil Pulley 37 Reduction Case 51 Reduction Gear 55 Cavity 57 First One-way Clutch 59 Hollow 61 Cylinder Shaft 63 Second One-way Clutch 65 Rotation Shaft

Claims (1)

(57) [Scope of utility model registration request] 1. A deceleration case (37) is provided on one side of a crankcase (7), and an intermediate gear (47) is rotatably supported by the deceleration case (37) by a starter motor (1).
A reduction gear (51) for a starter motor that can be driven via a hollow portion (55) is provided in the reduction gear (51) and a hollow portion (55) is concentric with the reduction gear (51). Cylindrical shaft (61) having a crankshaft (5) interlocked with
Through the first one-way clutch (57),
In the hollow part (59) of the cylindrical shaft (61), the rotary shaft (6
5) is mounted via a second one-way clutch (63), and a recoil pulley (13) for a recoil starter, which is rotatably supported on the speed reduction case side, is interlockingly connected to the rotating shaft (65). A starting device for an engine.