JP2998319B2 - Idle gear support structure for starter with idle gear - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an idle gear support structure for a starter having an idle gear.

[0002]

2. Description of the Related Art Conventionally, in a starter provided with an armature gear provided on a motor shaft, an idle gear meshing with the armature gear, and a drive gear meshing with the idle gear and transmitting a rotational force to the outside. The idle gear is disposed in a space formed between the housing and the center case, and a thrust force acting on the idle gear is received by a side surface of the idle gear engaging with the inner surface of the housing or the center case. A known configuration is known (see JP-A-59-185871).

[0003]

However, in this starter, when the idle gear rotates and a thrust force acts on the idle gear, and the side surface of the idle gear engages with the inner surface of the housing or center case, the housing or the center case is turned off. There is a problem that the inner surface of the case is shaved and worn.

As a countermeasure, it is conceivable to dispose washers between the side of the idle kill gear and the inner side of the housing and between the side of the idle gear and the inner side of the center case. As a result, the washer also rotates, causing a problem that a washer sound is generated.

[0005]

SUMMARY OF THE INVENTION As described above,
In order to solve the problem, we have the idle gear of the present invention
In the idle gear supporting structure of the starter that the armature gear provided on the motor shaft, a drive gear for transmitting a rotational force to the outside, and an idle pin that is supported by and fixed to the frame, the rotation around the idle pin are possible arranged to mesh with said armature gear and the drive gear, rotatably supported and the idle gear for transmitting the rotational force of the motor to the drive gear, the idle gear so as to be rotatable relative to said idle pin a roller for the idle gear is relatively rotatably disposed with respect to the inner circumference of the idle pin, and the idle gear, the starter and a retainer for rotatably retaining the rollers, the both sides of the idle gear Circle on face
Annular recesses are respectively formed, and the recesses are formed on the inner surfaces of the recesses.
The retainer receives a thrust force acting on the idle gear in the thrust direction by engaging the retainer.

[0006]

[Action] the thrust direction of the force acting on the idle gear,
Engage with annular recesses on both sides of idle gear
Received by the retainer. Aspects of this for the idle gear directly to the inner surface of the housing and the center case
Since there is no close contact engagement , the housing and security
The inner surface of the engine case is
Eliminates the risk of wear. Therefore, the idle gear side
Idle gear for the purpose of increasing the load bearing area of the surface.
It is not necessary to increase the size. Note that the housing and
The area of the retainer that contacts the inner surface of the
Takes large because it is not narrowed by rollers
Is easier and can reduce surface pressure
Of the housing and center case by the retainer
Wear on the inner surface is negligible.

[0007]

FIG. 1 is a longitudinal sectional view of a starter. Referring to FIG. 1, 1 is an aluminum housing of a starter, 2 is an aluminum center case, 3 is an armature gear provided on a motor shaft, 4 is meshed with the armature gear 3 and is rotatable around an idle pin 5. Idle gear, 6
Is a synthetic resin retainer interposed between the idle pin 5 and the idle gear 4 to support the idle gear 4 on the idle pin 5 via the idle roller 12. The drive gear integrated with the clutch 8 is shown.

The right end of the idle pin 5 is the center case 2
Is press-fitted and fixed. The retainer 6 is formed by combining a pair of retainer elements 10 having the same shape. FIG. 2 is a cross-sectional view of the retainer element 10, and FIG. 3 is a left side view of the retainer element 10 as viewed in the direction III in FIG. Referring to FIGS. 2 and 3, the retainer element 10 includes a disc-shaped portion 10a and a disc-shaped portion 10a.
And an annular portion 10b provided concentrically. A hole 10c through which the idle pin 5 passes is formed along the center line C at the center of the disc-shaped portion 10a and the annular portion 10b. The diameter of the disk-shaped portion 10a is larger than the diameter of the annular portion 10b, so that the outer peripheral portion of the disk-shaped portion 10a forms a flange portion 10d.

An idle roller 12 is provided on the annular portion 10b.
(See FIG. 1) A plurality of roller holding holes 10 for holding
e are formed at equal intervals. Each roller holding hole 10e
Is formed only in the annular portion 10b. Therefore, one end of each roller holding hole 10e is closed by the disk-shaped portion 10a, and the other end is open. Each roller holding hole 10
Each center line of e is parallel to the center line C of the idle pin hole 10c. The length of each roller holding hole 10 e is slightly longer than の of the length of the idle roller 12. Since the diameter of each roller holding hole 10e is larger than the diametrical width of the annular portion 10b, a part of the inner peripheral side and the outer peripheral side of the annular portion 10b is cut out by each roller retaining hole 10e. Therefore, in FIG. 3, when the idle roller 12 is inserted into each roller holding hole 10e, the outer peripheral surface of the idle roller 12 protrudes from the notch on the inner peripheral side and the outer peripheral side of the annular portion 10b.

Referring again to FIG. 1, the pair of retainer elements 10 are connected so that the top surfaces of the annular portions 10b of the pair of retainer elements 10 are in close contact with each other. An idle roller 12 is rotatably inserted into each roller holding hole 10e. The idle pin 5 is inserted into the idle pin hole 10c, and the retainer 6 is rotatably supported by the idle pin 5 via each idle roller 12.

The retainer 6 is arranged such that both side surfaces thereof have a slight clearance facing the housing 1 and the center case 2, respectively. The idle gear 4 is supported on the outer periphery of the retainer 6 via each idle roller 12 so as to be rotatable relative to the retainer 6. Annular concave portions 4a and 4b are respectively formed at both ends of the inner periphery of the idle gear 4, and a flange portion 10d of the retainer 6 is loosely fitted into each of the concave portions 4a and 4b. Therefore, the thrust force acting on the idle gear 4 in the thrust direction is reduced by the flange 10 d of the retainer 6.
Received by There is a sufficient space between both side surfaces of the idle gear 4 and the inner surfaces of the housing 1 and the center case 2, and the side surfaces of the idle gear 4 do not engage with the inner surfaces of the housing 1 and the center case 2.

[0012] armature gear 3 is rotated by the idle gear 4 is rotated, whereby the drive gear 7 you rotate. At this time, a thrust force acts on the idle gear 4, and the thrust force is received by the flange portion 10 d of the retainer 6, and the flange portion 10 d is engaged with the housing 1 or the center case 2. Therefore, the side surface of the idle gear 4 is formed by the housing 1 and the center case 2.
Does not engage directly, it is possible to prevent the inner surface of the housing 1 and the center case 2 Ru <br/> allowed to wear the idle gear 4. It also allows
It is necessary to increase the load bearing area on both sides of the idle gear 4
The idle gear 4 can be reduced in size.
It will work.

Further, since there is no need to use a washer, no washer sound is generated. FIG. 4 shows another embodiment of the retainer 6. Referring to FIG. 4, the retainer 16 includes a retainer element 20 and a washer-shaped portion 21 connected thereto. The retainer element 20 is substantially similar in shape to the retainer element 10 shown in FIGS.
It has a disk-shaped portion 20a and an annular portion 20b, and is formed with an idle pin hole 20c, a flange portion 20d, and a roller holding hole 20e. However, the length of the roller holding hole 20 e is slightly longer than the length of the idle roller 12.

The diameter of the washer-like portion 21 is
0a and the center of the idle pin hole 21a
Are formed. With the retainer 16, the same operation and effect as those of the retainer 6 can be obtained.

[0015]

Even if a thrust force is generated in the idle gear , the side surface of the idle gear does not directly contact and engage with the inner surface of the housing and the center case.
It can be the inner surface of the housing and the center case to prevent the you wear is by friction the idle gear
At the same time, it is possible to reduce the size of the idle gear.
Contact the inner surface of the housing and center case.
The area of the retainer can be reduced by rollers.
It is easy to take large because there is no, wear due to it
Can be ignored.

Since there is no need to use a washer, no washer sound is generated.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a starter.

FIG. 2 shows a cross-sectional view of a retainer element.

FIG. 3 is a left side view of the retainer element of FIG. 2 as viewed from a direction III.

FIG. 4 is a view showing a retainer of another embodiment.

[Description of Signs] 3 ... Armature gear 4 ... Idle gear 5 ... Idle pin 6 ... Retainer 7 ... Drive gear

Claims (3)

(57) [Claims] And 1. A armature gear provided on the motor shaft is rotatably disposed a drive gear for transmitting a rotational force to the outside, and an idle pin fixedly supported on the frame, around the idle pin, meshes with the armature gear and the drive gear, rotatably supporting the idle gear for transmitting the rotational force of the motor to the drive gear, the a <br/> Idorugiya so as to be rotatable relative to said idle pin and the roller, the idle gear being relatively rotatably disposed with respect to the inner circumference of the idle pin, and the idle gear, the starter and a retainer for rotatably retaining the rollers, the both sides of the idle gear Form annular recesses in each
And engage the retainer with the inner surfaces of the recesses.
And the idle gear supporting structure of the starter with idle gear, characterized in that the thrust force acting on the idle gear and to receive by said retainer. 2. An armature provided on a motor shaft.
A gear, a drive gear for transmitting rotational force to the outside, an idle pin supported and fixed to a frame, and rotatably disposed around the idle pin.
Gear and the drive gear, and
Idler that transmits the torque of the motor to the drive gear
And the arm so as to be rotatable with respect to the idle pin.
A roller that supports the idle gear, the idle pin on the inner periphery of the idle gear, and the roller.
It is arranged to be rotatable relative to the idle gear,
And a retainer for rotatably holding the roller, and annular concave portions are formed on both side surfaces of the idle gear, respectively.
And engage the retainer with the inner surfaces of the recesses.
By this, the thrust direction acting on the idle gear
To the starter that receives the force by the retainer
The retainer includes a disc-shaped portion and an annular portion, and a flange portion is provided on the disc-shaped portion to provide the idle gear.
Idle gear supporting structure of the starter with A Idorugiya the thrust force, characterized in that the receive Te <br/> by the flange portion which acts on ya. 3. An armature provided on a motor shaft.
A gear, a drive gear for transmitting rotational force to the outside, an idle pin supported and fixed to a frame, and rotatably disposed around the idle pin.
Gear and the drive gear, and
Idler that transmits the torque of the motor to the drive gear
And the arm so as to be rotatable with respect to the idle pin.
A roller that supports the idle gear, the idle pin on the inner periphery of the idle gear, and the roller.
It is arranged to be rotatable relative to the idle gear,
A retainer for rotatably holding the roller, and annular recesses are formed on both side surfaces of the idle gear, respectively.
And engage the retainer with the inner surfaces of the recesses.
By this, the thrust direction acting on the idle gear
To the starter that receives the force by the retainer
Oite, the retainer is provided with a respective disc-shaped portion and an annular portion
A pair of retainer elements is, configured by Rukoto mutually brought into contact with the annular portion of the pair of retainers elements
Idle gear supporting structure of the starter having the characteristics and to luer Idorugiya that have been made.