JP2541639Y2 - 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. 3 and a half sectional view along line AA in FIG. 3 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 pressed against the sub gear 3 via a disc spring 5, and the sub gear 3 and the input gear 2 are meshed with, for example, an engine-side gear. 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. 5, 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 to 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
However, 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 that transmits rotation of an input gear to the rotation shaft only through the sprag, a plurality of engagement holes are formed at predetermined intervals on the outer periphery of the rotation shaft, and a check is made to engage with the engagement hole. An output gear having a plurality of blind holes formed at predetermined intervals on an inner peripheral surface of the ball and a coil spring for pressing the check ball is loosely fitted on the outer periphery of the rotating shaft.

[0005]

[Action] The rotation is transmitted from the input gear to the rotating shaft via the sprag, and the check ball is normally engaged in the engagement hole in a pressing manner, and the rotation of the rotating shaft is transmitted to the output gear to output. The gear rotates together with the rotating shaft and transmits a rotating force to the outside. However, when an overload is input, the check ball is pulled out of the engagement hole of the rotating shaft, and the rotating shaft idles with respect to the output gear. Is prevented satisfactorily.

[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 sectional view of the right end of the rotating shaft of the two-way differential clutch shown in FIG. As shown in the figure, the right end of the rotating shaft 1 is a small-diameter portion 1a formed with a small diameter, and the outer periphery of the small-diameter portion 1a has four V-shaped portions at predetermined intervals as shown in the sectional view of FIG. Engagement holes 1b, 1b, 1b, 1b having a U-shaped cross section are formed.

An output gear 9 is rotatably and loosely fitted outside the small diameter portion 1a, and four blind holes are provided on the inner peripheral surface of the output gear 9 at positions corresponding to the engagement holes 1b. 9a, 9a, 9a, 9a are formed. A coil spring 12 is provided in each of the blind holes 9a, and a check ball 13 is provided on the inner end side of the coil spring 12. By the pressing force of the coil spring 12
b, 1b. Therefore, when the input gear 2 rotates rapidly and the rotational force of the input gear 2 is transmitted to the rotary shaft 1 via the sprags 8, the rotation of the rotary shaft 1 will not rotate under the normal load condition.
Is transmitted to the output gear 9 because it is engaged in the engagement hole 1b, and the rotational force is transmitted to the outside via the output gear 9.

However, when an overload is applied to the two-way differential clutch, the check ball 13 is inserted into the engagement hole 1b.
And the rotating shaft 1 idles with respect to the output gear 9, so that excessive torque is not transmitted to the output gear 9, and damage to the two-way differential clutch at the time of overload can be prevented well.

[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 an input gear to the rotating shaft via the sprag only when rotating faster than the rotating shaft, a plurality of engagement holes are formed at predetermined intervals on the outer periphery of the rotating shaft, and An output gear formed by forming a plurality of check holes engaged with the engagement holes and a plurality of blind holes at predetermined intervals on the inner peripheral surface, in which a coil spring for pressing the check balls is fitted, is loosely fitted to the outer periphery of the rotary shaft. As a result, when an overload is input, the check ball withdraws from the engagement hole of the rotating shaft and the rotating shaft idles with respect to the output gear, preventing overload from being transmitted to the output gear. Corruption 2 direction differential clutch during load is satisfactorily prevented.

[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 a cross-sectional configuration diagram taken along line BB of FIG.

FIG. 3 is an overall vertical sectional view of a conventional two-way differential clutch.

FIG. 4 is a half sectional view taken along line AA of FIG. 2;

FIG. 5 is a diagram illustrating the operation of a two-way differential clutch.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotation axis 1a Small diameter part 1b Engagement hole 2 Input gear 3 Sub gear 4 Inner holding member 6 Outer holding member 8 Sprag 9 Output gear 9a Blind hole 12 Coil spring 13 Check ball

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 fast, a plurality of engaging holes are formed at predetermined intervals on the outer periphery of the rotating shaft, and the engaging hole is formed in the engaging hole. An output gear formed by forming a plurality of blind holes at predetermined intervals on an inner peripheral surface of a check ball to be engaged with and a coil spring for pressing the check ball is loosely fitted to the outer periphery of the rotary shaft. Then, an overload input prevention structure of the two-way differential clutch.