JP2541640Y2 - Overload input prevention structure for two-way differential clutch - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a structure for preventing an overload input in a two-way differential clutch.

[0002]

2. Description of the Related Art Conventionally, a two-way differential clutch used in a power transmission path of an automobile or the like is shown in a longitudinal sectional view in FIG. 2 and a half sectional view taken along a line AA in FIG. 2 in FIG. The input gear 2 is rotatably provided via a bearing on the outer periphery of the rotating shaft 1 rotatably provided via a bearing. A plurality of sprags 8, 8, 8 are interposed at predetermined intervals between the outer peripheral surface and the inner peripheral surface of the input gear 2, and each of the sprags 8, 8, 8 is provided on the inner peripheral surface of the input gear 2. Pin 7
And a pocket portion of the inner holding member 4 slidably disposed on the outer periphery of the rotary shaft 1. The sub gear 3 is press-fitted to the sub gear 3 via a disc spring 5. The sub gear 3 and the input gear 2 are meshed with, for example, an engine gear, and the rotational force of the engine is input to the input gear 2 and the sub gear 3. It has become something. By the way, the number of teeth of the sub gear 3 is made larger than the number of teeth of the input gear 2, and
The rotation of the input gear 2 is set to be delayed from the rotation of the input gear 2. As shown in FIG. 4, the inner holding member 4 pressed against the sub gear 3 generates a differential speed with respect to the rotation of the input gear 2, Until the stopper 10 of the inner holding member 4 comes into contact with the end of the pocket of the outer holding member 6, the inner holding member 4 is relatively rotated leftward in the drawing, and each sprag 8 is tilted accordingly. In this case, if the rotation of the rotation shaft 1 is faster than the rotation of the input gear 2, the sprag 8 stands up and the rotation shaft 1 idles, but the rotation of the rotation shaft 1 is slow and the rotation of the input gear 2 is slow. Is faster, the inner peripheral surface of the input gear 2 and the outer peripheral surface of the rotary shaft 1 are connected by the tilting of the sprag 8, and the rotation of the input gear 2 is transmitted to the rotary shaft 1. That is, the two-way differential clutch transmits the torque of the input gear 2 to the rotation shaft 1 only when the rotation of the input gear 2 is faster than the rotation of the rotation shaft 1 irrespective of the forward / reverse rotation. ing. An output gear 9 is externally fitted on the outer periphery of the rotating shaft 1 by spline fitting. For example, a gear on the wheel side is meshed with the output gear 9 so that the rotational force is transmitted to the wheel side. It has become.

In such a conventional structure, the rotating shaft 1
On the other hand, since the output gear 9 is fixed, there is a problem that the internal portion of the two-way differential clutch may be damaged when an overload is input.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has as its object to provide a structure capable of favorably preventing damage due to an overload input. When a plurality of sprags are interposed between the outer peripheral surface of the rotating shaft and the inner peripheral surface of the input gear rotatably disposed on the outer periphery of the rotating shaft, when the input gear rotates faster than the rotating shaft. In a two-way differential clutch for transmitting rotation of the input gear to the rotating shaft only through the sprag, an output having a tapered cone portion formed on the inner circumferential surface, the tapered surface being formed on the rotating shaft and slidingly contacting the tapered surface. A gear is provided on the outer periphery of the rotating shaft, and a disc spring for pressing the output gear toward the tapered surface is fixed to the rotating shaft.

[0005]

Since the tapered cone formed on the inner peripheral surface of the output gear is pressed against the tapered surface formed on the rotating shaft via a disc spring, an overload is transmitted from the rotating shaft. Sometimes, the output gear can slide and rotate with respect to the rotating shaft against the pressing force of the disc spring, and the rotating shaft idles, and the inner member of the two-way differential clutch and between the rotating shaft and the output gear. Excessive rotational force is not transmitted, and breakage is favorably prevented.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an enlarged cross-sectional configuration view of a mounting portion of an output gear to a rotating shaft in a two-way differential clutch similar to FIG. 2 described above, and a small-diameter portion 1a having a reduced diameter is provided at the right end of the rotating shaft 1. The small-diameter portion 1a has an inclined tapered surface 1b at the left end. on the other hand,
The output gear 9 externally fitted to the small diameter portion 1a is integrally formed with a tapered cone portion 9a projecting toward the tapered surface 1b and having an inner peripheral surface formed in a tapered shape.

A stop ring 11 is fitted around the outer periphery of the rotary shaft 1, and a disc spring 12 is fixed inside the stop ring 11. The disc spring 12 is connected to the output gear 9.
And the output gear 9 is pressed against the tapered surface 1b side, and the tapered cone portion 9a of the output gear 9 is always pressed against the tapered surface 1b of the rotating shaft 1 by the disc spring 12. It has become.

Therefore, in the normal state, when the rotation of the input gear 2 is faster than the rotation of the rotating shaft 1 as described above, the torque of the input gear 2 is transmitted to the rotating shaft 1 and the rotation of the rotating shaft 1 is performed. Is transmitted to the wheel side via the output gear 9. However, when excessive torque is transmitted to the rotating shaft 1 via the input gear 2, the tapered surface is opposed to the pressing force of the disc spring 12. 1b is in sliding contact with the tapered cone portion 9a, and the rotation of the rotating shaft 1 is not transmitted to the output gear 9, but the rotating shaft 1 is idled at the time of overload to prevent transmission of the overload. Therefore, excessive torque or the like is not transmitted to the constituent members of the two-way differential clutch and the output gear 9, and damage to the two-way differential clutch is favorably prevented.

[0009]

According to the present invention, a plurality of sprags are interposed between an outer peripheral surface of a rotating shaft and an inner peripheral surface of an input gear rotatably disposed on the outer periphery of the rotating shaft. In a two-way differential clutch that transmits rotation of the input gear to the rotating shaft via the sprag only when rotating faster than the rotating shaft, a tapered cone portion that forms a tapered surface on the rotating shaft and slides on the tapered surface. An output gear having an inner peripheral surface is provided on the outer periphery of the rotating shaft, and a disc spring that presses the output gear toward the tapered surface is fixed to the rotating shaft. By the pressing force, the output gear rotates together with the rotation shaft, and the torque from the input gear can be transmitted to the outside in a good condition. Further, in the overload state, the taper cone portion slides on the tapered surface to make the rotating shaft idle and cut off the transmission of the overload, so that the two-way differential clutch can be prevented from being damaged satisfactorily.

[Brief description of the drawings]

FIG. 1 is an enlarged cross-sectional configuration diagram of a mounting structure of a rotating shaft and an output gear.

FIG. 2 is an overall vertical sectional view of a conventional two-way differential clutch.

FIG. 3 is a half sectional view taken along line AA of FIG. 2;

FIG. 4 is a diagram illustrating the operation of a two-way differential clutch.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotating shaft 1a Small diameter part 1b Tapered surface 2 Input gear 3 Sub gear 4 Inner holding member 6 Outer holding member 8 Sprag 9 Output gear 9a Tapered cone part 11 Stop ring 12 Disc spring

Claims (1)

(57) [Scope of request for utility model registration] 1. A plurality of sprags are interposed between an outer peripheral surface of a rotating shaft and an inner peripheral surface of an input gear rotatably disposed on an outer periphery of the rotating shaft, wherein the input gear is more than the rotating shaft. In a two-way differential clutch that transmits the rotation of the input gear to the rotating shaft via the sprag only when rotating rapidly, a tapered surface is formed on the rotating shaft, and a tapered cone portion that slides on the tapered surface is formed on an inner peripheral surface. Wherein an output gear provided on the rotary shaft is provided on the outer periphery of the rotary shaft, and a disc spring for pressing the output gear toward the tapered surface is fixed to the rotary shaft. Construction.