JPH06249111A - Starter - Google Patents

Abstract

PURPOSE:To reduce abrasion of a bearing part of a pinion movable body by forming a clearance between a shaft and the bearing part such that the bearing part is arranged on a small diameter portion of a shaft when the pinion is separated from a ring gear, while it is moved to a large diameter portion of the shaft when the pinion is meshed with the ring gear. CONSTITUTION:A shaft 101 is made up of a large diameter portion 101b, a small diameter portion 101d, a tapered portion 101c, and a spline 101a. The large diameter portion 101b supports a pinion metal (bearing part) 106 of a pinion movable body at the starting time. A specified value, for instance, 10 to 40mum of clearance is formed between the portion 101b and the pinion metal 106. Except for the starting time, the small diameter portion 101d supports the pinion metal 106. A specified value, for instance, 50 to 150mum of clearance is formed between the portion 101d and the pinion metal 106. The bearing part is prevented from contacting with the shaft, which may caused by oscillation of an engine, when the pinion is separated from a ring gear. When the pinion is meshed with the ring gear, the clearance therebetween is minimized by means of the large diameter portion, and the torque is satisfactorily transmitted.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to starters, and in particular
The present invention relates to the 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 one-way clutch of a conventional starter. The shaft 101 is formed integrally with the rotary shaft of the starter motor, and a spline 101a is formed on the outer periphery thereof.

The pinion moving body P is mainly composed of the shaft 10.
A driving cylinder (hereinafter referred to as "clutch outer") 102 to which the rotational force of 1 is transmitted, a driven cylinder (hereinafter referred to as "pinion inner") 104 to which the rotational force of this clutch outer 102 is transmitted, and a clutch outer 102, The pinion inner 104 is composed of a roller 103 capable of transmitting a rotational force.

As is well known, the clutch outer 102 has a wedge-shaped inner periphery and the spline 101a.
Is formed with a spline 102a. A pinion 105 that meshes 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 circumference of the clutch outer 102 and between the inner circumference of the clutch outer and the inner circumference. Form an annular space. The pinion inner 104 is rotatably and slidably arranged on the shaft via a pinion metal 106 press-fitted on the inner circumference.

As well known, a roller 103 and a spring (not shown) are housed in the annular space formed by the clutch outer 102 and the pinion inner 104, and the roller 103 serves as the clutch outer 10.
2 only when the pinion inner 104 rotates in one direction, the inner circumference of the clutch outer 102 and the pinion inner 1
By engaging with the outer periphery of 04, only power transmission from the starter motor to the internal combustion engine (not shown) is possible.

With the above structure, when the starter motor is driven, the shaft 101 rotates, and the clutch outer 102 fitted to the splice 101a of the shaft 101 rotates and moves leftward in the drawing. At that time, the roller 103
Is the inner periphery of the clutch outer 102 and the pinion inner 10
4, the pinion inner 104 moves leftward in the drawing 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 conventional starter described above, it is possible to satisfactorily transmit the rotation of the pinion to the ring gear of the internal combustion engine without rattling 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 that it can be achieved. Further, this minute clearance is always constant when the pinion inner 104 is in the position shown in FIG. 2 and when it is moved to the left in the drawing when the internal combustion engine is started. On the other hand, the clutch outer 102 and the shaft 10
In the spline fitting with 1, the fitting backlash is set relatively large in order to improve the slidability of the clutch outer 102.

Therefore, the one-way clutch consisting of the clutch outer 102 and the pinion inner 104 is almost supported by the pinion metal 106. After the internal combustion engine is started, the pinion metal 1 is responsive to vibrations and the like due to continuous operation of the engine at high rotation speed.
Since 06 contacts the shaft, the pinion metal 106
It causes a problem of wear.

Further, in addition to the above-mentioned prior art, the pinion inner is formed of a resin such as nylon, and the inner circumference 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 is a problem that the inner circumference of the pinion inner forming the bearing portion is worn due to vibration or the like.

Therefore, the present invention aims to reduce the wear of the bearing portion.

[0011]

In order to achieve the above object, the present invention provides a pinion metal 106 and a shaft 101.
Focusing on the fact that the clearance between the internal combustion engine and the internal gear of the internal combustion engine is 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 arranged on the shaft to which the rotational force of the starter motor is transmitted. In the starter provided with a pinion moving body that transmits the rotational force of the starter motor to the ring gear via the pinion while the pinion and the ring gear mesh with each other by sliding the shaft toward one end side, 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 an outer diameter smaller than the large diameter portion provided between the spline portion and the large diameter portion. The pinion moving body is fitted to the spline portion of the shaft with a first clearance on the inner circumference, and the pinion moving body is rotated. It is slid between the spline portion and the large diameter portion and the small diameter portion of the shaft, and is arranged on the large diameter portion when the pinion and the ring gear are separated from each other, and is arranged on the small diameter portion when the pinion and the ring gear are engaged. And a second bearing between the bearing and the small diameter portion is larger than the first clearance.

[0012]

[Operation and Effect of the Invention] The bearing portion of the pinion moving body is
It is placed on the small diameter part of the shaft when the pinion and the ring gear are separated, and is placed on the large diameter part on the one end side of the shaft when the pinion and the ring gear are engaged by the movement of the pinion moving body to the one end side of the shaft. The clearance between the shaft and the bearing portion when the pinion and the ring gear mesh with each other is smaller than that when the pinion and the ring gear separate from each other. The second portion between the small diameter portion of the shaft and the bearing portion
Since the clearance is larger than the first clearance of the spline portion, the pinion moving body is supported by the spline portion when the pinion and the ring gear are separated from each other.

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

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The starter of the present invention will be described below 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.
Only the shape of the portion that supports 106 is different, and the other portions have the same configuration. The same components are designated by the same reference numerals, and description thereof will be omitted.

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 taper portion 101c provided therebetween. The large diameter portion 101b supports the pinion metal 106 when the internal combustion engine is started, and is provided on the tip side of the shaft 101. The large-diameter portion 101b has an outer diameter with which the clearance with the pinion metal 106 is 10 to 40 μm so that the rotation of the pinion can be satisfactorily transmitted to the ring gear of the internal combustion engine as in the conventional case. The small diameter portion 101d supports the pinion metal 106 when the internal combustion engine is not 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 μm. Have. The taper portion 101c smoothly connects the outer circumference of the large diameter portion 101b and the outer circumference of the small diameter portion 101d so that the clutch can be favorably advanced.

According to the above construction, when the internal combustion engine is started,
Since the clearance between the pinion metal 106 and the shaft 101 (large-diameter portion 101b) is small as in the conventional case, the rotation of the pinion can be satisfactorily transmitted 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 that when the internal combustion engine is started. Therefore, 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 compared to what was conventionally supported by the pinion metal 106 even when the clutch is stationary. Wear of 106 is reduced. As mentioned above, the clearance when the clutch is stationary is 5
In the case of 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 forward movement of the clutch can be favorably performed, but the tapered portion 101c may be omitted. In this case, the large diameter portion 101b and the small diameter portion 10 of the shaft 101
A step is formed between 1d and the pinion metal 1
By providing the taper portion 06 with a large opening area of the inlet and a decreasing opening area toward the inside, the forward movement of the clutch can be favorably performed.

Further, the clutch shown in the embodiment is a roller clutch provided with the roller 103, but the invention is not limited to this, and it may be a rubber clutch.
It may be a shift starter including a magnet switch and a shift lever that connects the magnet switch and the clutch.

Further, the clutch may be one in which the bearing portion is formed by the inner circumference of the pinion inner and the pinion metal 106 is unnecessary.

[Brief description of 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)

Claims (1)

[Claims] 1. A pinion, which meshes with a ring gear of an internal combustion engine, is slidably arranged on a shaft to which the rotational force of a starter motor is transmitted, and the pinion and the ring gear are slid toward one end of the shaft. In a starter equipped with a pinion moving body that meshes with and transmits the rotational force of the starter motor to the ring gear via the pinion, the shaft has a large-diameter portion provided on the one end side and a large-diameter portion 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, the pinion moving body, the spline of the shaft on the inner periphery. Slides between the large diameter portion and the small diameter portion of the shaft and the spline portion for rotating the pinion moving body while fitting with the first clearance with the first clearance. Along with, the pinion and the ring gear are disposed on the large diameter portion when separated from each other, and a bearing portion that is disposed on the small diameter portion when meshing with the pinion and the ring gear, and the bearing portion and the small diameter portion. A starter characterized in that a second clearance between the two is greater than the first clearance.