JPH0223715B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improved overrunning clutch for a starter.

In a conventional overrunning clutch,
Since the helical spline on the clutch shaft and the helical spline provided on the clutch outer are slidably supported in a cantilevered manner, the play in the spline fitting may cause the outer to be tilted or eccentric (runout) relative to the inner. However, a major drawback was that good overrun performance could not be obtained.

In order to solve the above-mentioned drawbacks, the present invention brings at least a part of the spline tube of the clutch outer to the inside of the inner, thereby restricting the inclination and eccentricity (run-out) of the outer with respect to the inner, thereby achieving good overrun. The purpose is to obtain high performance.

The present invention will be described below with reference to embodiments shown in the drawings. FIG. 1 is a half-sectional view showing an embodiment of an overrunning clutch according to the present invention, in which 1 is a clutch outer, 2 is a spline tube integrally formed inside the clutch outer 1, and 2a is a clutch outer. This is a helical spline provided on the inner peripheral surface of 1 by broaching or the like. 3 is a clutch shaft rotationally driven by a starter motor; 3a is a clutch shaft 3;
The helical spline 4 provided above is a clutch inner disposed between the outer 1 and the spline tube 2, and a pinion 4a is integrally molded therein. 5 is a bush press-fitted to the outer circumference of the spline tube 2 or the inner circumference of the inner 4;
7 is a clutch roller disposed between the outer 1 and the inner 4, and 7 is a clutch cover provided between the outer 1 and the inner 4 to cover the roller 6. A helical spline 3a provided on the clutch shaft 3 and a spline tube 2 provided on the outer 1 are slidably assembled, and the entire clutch is assembled and held by a clutch cover 7. .

Next, the operation of the above configuration will be explained. The rotational force of a starter motor (not shown) is transmitted to the outer 1 via the spline tube 2 of the outer 1 facing the helical spline 3a on the shaft 3, and is transmitted from the inner cam chamber 1a of the outer 1 to the inner 4 through the roller 6. The engine ring gear (not shown) is driven by the pinion 4a provided at the other end of the inner 4, and the engine reaches a complete explosion. After the engine has completely exploded, the pinion gear 4a is overrun by an engine ring gear (not shown).

At this time, the structure is such that a slip occurs between the inner 4 and the roller 6, and the overrun torque from the engine is cut off.

Therefore, in the conventional structure shown in FIG. 2, only one end of the outer 1 is cantilever-supported by the spline tube 2, so that the play in the spline fitting causes the inclination and eccentricity (runout) of the outer 1 with respect to the inner 4. As a result, it is difficult to reliably separate the overrun torque from the engine, resulting in seizure of the inner 4 and roller 6. This allows the overrun torque of the engine to be applied to the inner 4, roller 6,
Since the power is transmitted to the shaft 3 via the outer 1, the starter motor (not shown) over-rotates, resulting in a serious drawback of damage to the motor.

On the other hand, in the one shown in FIG. 1, the spline tube 2 of the clutch outer 1 is placed inside the inner 4 through a bearing member (bush) 5, so that the inclination of the outer 1 with respect to the inner 4, which is a conventional drawback, is prevented. Since eccentricity (runout) can be controlled, engine overrun torque can also be restricted.
Excellent overrun performance can be obtained in that the starter motor will not be over-rotated and the motor will not be damaged. Furthermore, according to the one in Figure 1, the clutch outer length has been shortened (l′→
l) This also has the effect of making it possible to shorten the overall length of the starter.

In the embodiment described above, the clutch outer 1
Although the shaft 3 is engaged by a helical spline, the same effect can be obtained even if a linear spline is used.

Furthermore, in the embodiment described above, the entire spline inch tube 2 is configured inside the outer cam chamber, but as in another embodiment shown in FIG. Even if this extended portion is engaged with a part of the inner 4 via the bearing member 5, the same effect of improving overrun performance can be obtained. Further, the bearing member 5 may be a lubricating member such as grease by appropriately setting the tube outer circumferential diameter and inner inner circumferential diameter.

[Brief explanation of drawings]

FIG. 1 is a half-sectional view showing one embodiment of the device of the present invention, FIG. 2 is a half-sectional view of a conventional device, and FIG. 3 is a half-sectional view of another embodiment of the device of the present invention. 1... Clutch outer, 2... Spline inch tube, 3... Clutch shaft, 4... Clutch inner, 4a... Pinion, 5... Bearing member (bush).

Claims (1)

[Claims] 1. In a starter in which a pinion transition body including a pinion and a spline tube is slidably provided on a shaft, at least a part of the spline tube is disposed inside a clutch inner, and Overrunning clutch for engaged starter.