JP3074999B2 - Starter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a starter.
The present invention relates to a shape of a shaft that holds a pinion moving body that enables power transmission from a starter motor to an internal combustion engine.

[0002]

2. Description of the Related Art A conventional starter will be described with reference to FIG. FIG. 2 is a half sectional view showing a conventional starter, particularly a one-way clutch. The shaft 101 is formed integrally with the rotation shaft of the starter motor, and has a spline 101a formed on the outer periphery thereof.

[0003] The pinion moving body P mainly includes a shaft 10
A driving cylinder (hereinafter, referred to as “clutch outer”) 102 to which the rotational force of the first clutch is transmitted, a driven cylinder (hereinafter, “pinion inner”) 104 to which the rotational force of the clutch outer 102 is transmitted, and a clutch outer 102, It is composed of a roller 103 capable of transmitting a rotational force between the pinion inners 104.

As is well known, the clutch outer 102 has an inner periphery formed in a wedge shape.
Is formed. A pinion 105 meshing with a ring gear (not shown) of the internal combustion engine is integrally formed at one end of the pinion inner 104, and the other end is disposed on the inner periphery of the clutch outer 102 and between the inner periphery of the clutch outer 102. Form an annular space. The pinion inner 104 is rotatably and slidably disposed on a shaft via a pinion metal 106 pressed into the inner periphery.

A well-known roller 103 and a spring (not shown) are accommodated in the annular space defined by the clutch outer 102 and the pinion inner 104.
2 only when the pinion inner 104 rotates in one direction with respect to the inner circumference of the clutch outer 102 and the pinion inner 1.
By meshing with the outer periphery of the engine 04, only power transmission from the starter motor to the internal combustion engine (not shown) is possible.

With the above configuration, when the starter motor is driven, the shaft 101 rotates, and the clutch outer 102 fitted to the splice 101a of the shaft 101 moves to the left in the figure while rotating. At that time, the roller 103
Is the inner circumference of the clutch outer 102 and the pinion inner 10
4, the pinion inner 104 moves to the left in the figure while rotating together with the clutch outer 102, and the pinion 105 meshes with the ring gear of the internal combustion engine to transmit power to the internal combustion engine.

[0007]

In the above-mentioned conventional starter, it is possible to transmit the rotation of the pinion to the ring gear of the internal combustion engine without causing backlash between the pinion metal 106 and the shaft 101. In general, the clearance between the pinion metal 106 and the shaft 101 is set to about 10 to 40 μm so as to make it possible. The small clearance is always constant when the pinion inner 104 is at the position shown in FIG. 2 and when the pinion inner 104 is moved to the left in the figure when the internal combustion engine is started. On the other hand, the clutch outer 102 and the shaft 10
In spline fitting with No. 1, the fitting play is set relatively large in order to improve the slidability of the clutch outer 102.

Therefore, the one-way clutch including the clutch outer 102 and the pinion inner 104 is almost supported only by the pinion metal 106. After the start of the internal combustion engine, the pinion metal 1
06 is in contact with the shaft, so that the pinion metal 106
This causes a problem that the member is worn.

In addition to the above-mentioned prior art, the pinion inner is formed of a resin such as nylon, and the inner periphery of the pinion inner is used as a bearing portion to eliminate the need for the pinion metal. As in the prior art described above, there occurs a problem that the inner periphery of the pinion inner forming the bearing portion is worn due to vibration or the like.

Therefore, an object of the present invention is to reduce the wear of the bearing.

[0011]

In order to achieve the above object, the present invention provides a pinion metal 106 and a shaft 101.
Focusing on the point that the clearance between the starter motor and the starter motor must be small only when the internal combustion engine is started, it has a pinion that meshes with the ring gear of the internal combustion engine, and is slidably disposed on a shaft through which the torque of the starter motor is transmitted. A starter provided with a pinion moving body that transmits the rotational force of the starter motor to the ring gear through the pinion while the pinion and the ring gear mesh with each other by sliding toward one end of the shaft. A large-diameter portion provided on the one end side, a spline portion provided on the other end side, and a small-diameter portion having a smaller outer diameter than the large-diameter portion provided between the spline portion and the large-diameter portion. The pinion moving body has an inner periphery fitted to a spline portion of the shaft with a first clearance, and rotates the pinion moving body. A spline portion, the large diameter portion of the shaft, the sliding between the small diameter portion, wherein arranged pinion and upon separation of the ring gear on the small diameter portion, wherein on a large diameter portion at the time of engagement between the pinion and the ring gear And a bearing portion disposed, wherein a second clearance between the bearing portion and the small-diameter portion is larger than the first clearance.

[0012]

[Operation and Effect of the Invention] The bearing of the pinion moving body is
When the pinion and the ring gear are separated from each other, the pinion is disposed on the small-diameter portion of the shaft. The clearance between the shaft and the bearing when the pinion and the ring gear mesh with each other is smaller than that when the pinion is separated from the ring gear. Then, a second portion between the small diameter portion of the shaft and the bearing portion is formed.
Is larger than the first clearance of the spline portion, so that the pinion moving body is supported by the spline portion when the pinion is separated from the ring gear.

Therefore, when the pinion is separated from the ring gear, contact between the bearing and the shaft due to vibration of the internal combustion engine can be prevented, and wear of the bearing can be reduced. When meshing with
Due to the large diameter portion, the clearance between the shaft and the bearing portion is set small, and the transmission of the rotational force between the pinion and the ring gear can be performed well.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a starter according to the present invention will be described with reference to FIG. In the starter shown in FIG. 1 and the conventional starter shown in FIG. 2, the pinion metal (bearing) of the shaft 101 is used.
The only difference is the shape of the portion that supports 106, and the other portions have the same configuration. The same components have the same reference characters allotted, and description thereof will not be repeated.

As shown in FIG. 1, the shaft 101 of the starter of the present invention has a large diameter portion 101b, a small diameter portion 101d, and a tapered portion 101c provided therebetween. The large diameter portion 101b supports the pinion metal 106 at the time of starting the internal combustion engine, and is provided on the tip end side of the shaft 101. The large diameter portion 101b has an outer diameter of 10 to 40 μm in clearance with the pinion metal 106 so that the rotation of the pinion can be transmitted well to the ring gear of the internal combustion engine as in the related art. The small-diameter portion 101d supports the pinion metal 106 at times other than when the internal combustion engine is started (hereinafter referred to as "when the clutch is stationary"), and has an outer diameter with a clearance between the pinion metal 106 and 50 to 150 m. Have. The tapered portion 101c smoothly connects the outer periphery of the large-diameter portion 101b and the outer periphery of the small-diameter portion 101d so that the clutch can be favorably advanced.

According to the above configuration, when starting the internal combustion engine,
Since the clearance between the pinion metal 106 and the shaft 101 (the large-diameter portion 101b) is minute as in the related art, the rotation of the pinion can be transmitted well to the ring gear of the internal combustion engine.

When the clutch is stationary, the clearance between the pinion metal 106 and the shaft 101 (small diameter portion 101d) is larger than when the internal combustion engine is started, so that the clutch at this time is supported together with the spline fitting portion. Become. Therefore, the force applied to the pinion metal 106 when the shaft 101 vibrates due to the vibration of the internal combustion engine is reduced as compared with the conventional one in which the clutch is mostly supported by the pinion metal 106 even when the clutch is stationary. 106 wear is reduced. As described above, the clearance when the clutch is stationary is 5
When the thickness is 0 to 150 μm, the pinion inner 104
It has been confirmed by an experiment that the vibration G applied to is reduced by 10 to 30%.

In the above embodiment, the tapered portion 101c is provided on the shaft 101 so that the clutch can be favorably advanced. However, the tapered portion 101c may be omitted. In this case, the large diameter portion 101b and the small diameter portion 10b of the shaft 101
1d, a step is formed, but the pinion metal 1
By providing a tapered portion at 06 so that the opening area of the inlet is large and the opening area decreases toward the inside, the clutch can be favorably advanced.

The clutch shown in the embodiment is a roller clutch provided with the roller 103, but is not limited to this, and may be a rubber clutch.
The shift starter may be provided with a magnet switch and a shift lever connecting the magnet switch and the clutch.

Further, a clutch in which a bearing portion is formed by the inner periphery of the pinion inner and the pinion metal 106 is not required may be used.

[Brief description of the drawings]

FIG. 1 is a half sectional view showing an embodiment of a starter of the present invention.

FIG. 2 is a half sectional view showing a conventional starter.

[Explanation of symbols]

 P Pinion moving body 101 Shaft 101a Spline 101b Large diameter part 101c Small diameter part 102 Clutch outer 102a Spline 103 Roller 104 Pinion inner 105 Pinion 106 Pinion metal (bearing part)

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F02N 15/02 F02N 15/06

Claims (1)

(57) [Claims] 1. A pinion that meshes with a ring gear of an internal combustion engine, and is slidably disposed on a shaft to which a rotational force of a starter motor is transmitted, and the pinion and the ring gear are slid toward one end of the shaft. And a starter motor having a pinion moving body that transmits the rotational force of the starter motor to the ring gear via the pinion, wherein the shaft has a large-diameter portion provided on the one end side, and a large-diameter portion provided on the other end side. A spline portion provided, and a small-diameter portion having an outer diameter smaller than the large-diameter portion provided between the spline portion and the large-diameter portion, wherein the pinion moving body has a spline of the shaft on an inner periphery. A first spline portion which fits with a first clearance and rotates the pinion moving body, and slides between a large diameter portion and a small diameter portion of the shaft. Together with the pinion and the at spaced ring gear arranged on the small diameter portion, have a bearing portion to which the are arranged on the large-diameter portion when engagement between the pinion and the ring gear, the bearing portion and the small diameter portion A second clearance between the first and second clearances is greater than the first clearance.