JP2007071294A - Reverse input shutting-off clutch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reverse input shutting-off clutch having an input gear and an output gear and capable of dispensing with machining of a key groove and a spline. <P>SOLUTION: An input shaft 1 having the input gear 21 at the outer periphery and an output shaft 2 having the output gear 22 at the outer periphery are arranged on the same axis, and an outer ring 3 covering opposing end parts of both shafts is fixedly arranged. A torque transmission means 8 is provided between the input shaft 1 and the output shaft 2. Engaging pieces 16, 17 are assembled between the outer ring 3 and the output shaft 2 and are engaged with the inner periphery of the outer ring 3 and the outer periphery of the output shaft 2 when rotation torque is inputted into the output shaft 2 to lock the output shaft 2 and prevent rotation torque from being transmitted to the input shaft 1. Each of the input gear 21 on the input shaft 1 and the output gear 22 on the output shaft 2 is integrally formed on corresponding shafts to dispense with machining of the key groove and the spline. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a reverse input cutoff clutch that transmits rotational torque input to an input shaft to an output shaft and blocks transmission of rotational torque from the output shaft to the input shaft.

  As this type of reverse input cutoff clutch, the one described in Patent Document 1 has been conventionally known.

  FIG. 3 shows a reverse input cutoff clutch having the same basic structure as that of the reverse input cutoff clutch described in Patent Document 1. In this reverse input cutoff clutch, the input shaft 31 and the output shaft 32 are arranged coaxially with the shaft end faces facing each other, and the outer ring 33 covering the opposite ends of the input shaft 31 and the output shaft 32 is fixedly arranged. An engaging element 34 is incorporated between the inner periphery of the outer ring 33 and the outer periphery of the output shaft 32, and when rotational torque is input to the input shaft 31, engagement is performed by a column portion 35 provided at the shaft end portion of the input shaft 31. The coupling 34 is pressed to displace the engagement element 34 to a position where the engagement is released with respect to the inner periphery of the outer ring 33 and the outer periphery of the output shaft 32, and the illustration is provided between the input shaft 31 and the output shaft 32. The rotation of the input shaft 31 is transmitted to the output shaft 32 via the omitted torque transmission means.

  Further, when rotational torque is input to the output shaft 32, the engagement element 34 is engaged with the inner periphery of the outer ring 33 and the outer periphery of the output shaft 32 to lock the output shaft 32, and the rotation from the output shaft 32 to the input shaft 31 is performed. Torque transmission is cut off.

In the reverse input cutoff clutch as described above, an input gear 36 is provided on the input shaft 31, rotational torque is input to the input gear 36, and an output gear 37 is provided on the output shaft 32 to transmit from the input shaft 31. In many cases, the output torque is output from the output gear 37.
JP 2003-343601 A

  Incidentally, since the input gear 36 and the output gear 37 are generally separate from the input shaft 31 and the output shaft 32, it is necessary to prevent the input gear 36 and the output gear 37 from rotating with respect to the respective shafts. is there. As shown in FIG. 3, a method using a key 38 and a spline coupling method are conventionally known as the rotation stopper, but the outer periphery of the input shaft 31 and the output shaft 32 and the input gear 36 and the output gear 37 are used. Since it is necessary to process the key groove 39 and the spline on the inner periphery of the metal, there is a problem that the processing is very troublesome.

  In addition, in the case of a key stopper or a spline joint that is connected to the spline, it is usually fitted by a clearance fit, so that backlash and backlash occur at the connecting part, and the backlash gradually increases due to changes over time such as wear and deformation. There is a problem that the connecting portion is easily damaged.

  Here, to prevent rattling of the input gear and output gear, it is effective to bond the fitting portion with an adhesive, but the quality may be unstable due to variations in the amount of adhesive applied, There is a possibility that loosening occurs in the connecting part due to peeling of the key, and the key or the like is deformed over time, resulting in rattling.

  It is a technical object of the present invention to eliminate the need for machining key grooves and splines and eliminate rattling in a reverse input shut-off clutch having input / output gears.

  In order to solve the above problems, in the present invention, an input shaft having an input gear on the outer periphery, an output shaft having an output gear disposed on the outer periphery, arranged coaxially with the input shaft in a state where the shaft ends face each other, A fixedly arranged outer ring covering opposite ends of the input shaft and the output shaft, torque transmission means for transmitting the rotational torque of the input shaft to the output shaft, and engagement / disengagement with respect to the inner periphery of the outer ring and the outer periphery of the output shaft An engaging member that locks the output shaft when engaged and interrupts rotation transmission from the output shaft to the input shaft, and urges the engaging member in a direction to engage with the inner periphery of the outer ring and the outer periphery of the output shaft. A reverse input cutoff clutch comprising: an elastic member configured to disengage an engagement element to a disengagement position against the elasticity of the elastic member when the input shaft rotates; and at least one of the input gear and the output gear. One corresponding input shaft or output shaft It was adopted a configuration in which integrally formed.

  As described above, by forming at least one of the input gear and the output gear integrally with the corresponding input shaft or output shaft, it is possible to eliminate the need for processing of the keyway and the spline, and The backlash due to the change with time can be eliminated, and a reliable and reliable reverse input cutoff clutch can be obtained.

  In addition, the reverse input cutoff clutch can be reduced in size and weight by integrating the input gear and the output gear.

  Embodiments of the present invention will be described below with reference to FIGS. As shown in the figure, the input shaft 1 and the output shaft 2 are arranged coaxially with their shaft end faces facing each other, and the opposite ends of the input shaft 1 and the output shaft 2 are covered with an outer ring 3.

  The outer ring 3 is in a fixed arrangement, and the input shaft 1 and the output shaft 2 are rotatably supported by bearings 4 and 5 incorporated in the open end portion of the outer ring 3.

  The input shaft 1 has a flange 6 at the end facing the output shaft 2, and a cylindrical portion 7 provided on the outer periphery of the flange 6 is disposed between the output shaft 2 and the outer ring 3.

  Between the input shaft 1 and the output shaft 2, torque transmission means 8 for transmitting rotational torque input to the input shaft 1 to the output shaft 2 is provided.

  The torque transmitting means 8 has a pin 9 protruding from the outer periphery of the end of the output shaft 2, inserts the pin 9 into a pin hole 10 formed in the cylindrical portion 7 of the input shaft 1, and A rotational torque is transmitted from the contact portion of the pin 9 to the output shaft 2, and play 11 is provided between both ends of the pin 9 and the pin hole 10.

  A plurality of cam surfaces 13 forming a wedge-shaped space with the cylindrical inner surface 12 of the outer ring 3 are formed at equal intervals in the circumferential direction on the outer periphery of the end portion of the output shaft 2. The cam surface 13 is composed of a pair of inclined surfaces 13a and 13b inclined in opposite directions, and a support piece 14 facing radially outward is provided at the intersection of the pair of inclined surfaces 13a and 13b.

  A pocket 15 is formed in the cylindrical portion 7 so as to face each of the cam surfaces 13, and a first engagement element 16 and a second engagement element 17 are incorporated in each pocket 15. The first engagement element 16 and the second engagement element 17 are composed of rollers. The first engagement element 16 and the second engagement element 17 are urged toward a narrow portion of the wedge-shaped space by an elastic member 18 incorporated between the support piece 14.

  By forming the pocket 15 with respect to the cylindrical portion 7, a column portion 19 is provided as an unlocking means between the adjacent pockets 15. When the input shaft 1 is rotated by the input of rotational torque, the column portion 19 presses the first engagement element 16 or the second engagement element 17 on the front side in the rotation direction toward the wide portion of the wedge-shaped space. The engagement with the surface 13 and the cylindrical inner surface 12 is released.

  A play 20 in the rotational direction is provided between the column portion 19 and the first engagement element 16 and the second engagement element 17, and the play 20 is formed between the pin 9 and the pin hole 10 of the torque transmission means 8. It is smaller than play 11.

  In the reverse input cutoff clutch configured as described above, when rotational torque is input to the input shaft 1 and the input shaft 1 rotates, for example, in the direction indicated by the arrow in FIG. In order to press the engagement element 16 toward the wide portion of the wedge-shaped space, the input shaft 1 rotates in the direction of the arrow, and the rotation is transmitted to the output shaft 2 via the torque transmission means 8, and the output shaft 2 is input to the input shaft. Rotate in the same direction as 1. At this time, the second engagement element 17 idles along the cylindrical inner surface 12 of the outer ring 3.

  Further, when the input shaft 1 rotates in the direction opposite to the direction indicated by the arrow, the column portion 19 presses the second engagement element 17 on the front side in the rotation direction toward the wide portion of the wedge-shaped space. It rotates smoothly in the direction opposite to the arrow, and the rotation is transmitted to the output shaft 2 via the torque transmitting means 8, and the output shaft 2 rotates in the same direction as the input shaft 1. At this time, the first engagement element 16 idles along the cylindrical inner surface 12 of the outer ring 3.

  Here, when a rotational torque is input to the output shaft 2, the first engagement element 16 or the second engagement element 17 engages with the cylindrical inner surface 12 and the cam surface 13 according to the rotation direction. For example, when the output shaft 2 rotates in the clockwise direction of FIG. 2, the first engaging element 16 engages with the cylindrical inner surface 12 and the cam surface 13 to lock the output shaft 2, and the lock causes the input shaft 2 to input. The rotation torque is prevented from being transmitted to the shaft 1.

  In the reverse input cutoff clutch as described above, here, an input gear 21 is provided integrally with the input shaft 1, rotational torque is input to the input gear 21, and rotational torque transmitted from the input shaft 1 is output to the output shaft 2. Is output from an output gear 22 provided integrally therewith.

  In addition, the formation method of the input gear 21 and the output gear 22 can employ | adopt the processing method by plastic working or turning.

  As described above, by forming the input gear 21 and the output gear 22 integrally with the input shaft 1 and the output shaft 2, it is not necessary to process key grooves or splines on the input shaft 1 or the output shaft 2. In addition, the occurrence of rattling due to changes over time can be prevented, and a reliable and reliable reverse input cutoff clutch with stable quality can be obtained.

  One of the input gear 21 and the output gear 22 may be formed integrally with the corresponding input shaft 1 or output shaft 2.

  In the embodiment, rollers are employed as the engaging members 16 and 17, but sprags may be used. In this case, the inner surface of the outer ring 3 and the outer surface of the output shaft 2 are cylindrical.

A longitudinal front view showing an embodiment of a reverse input cutoff clutch according to the present invention Sectional view along the line II-II in FIG. A longitudinal front view showing a conventional reverse input cutoff clutch

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Input shaft 2 Output shaft 3 Outer ring 8 Torque transmission means 16 1st engagement element 17 2nd engagement element 18 Elastic member 19 Column (lock release means)
21 Input gear 22 Output gear

Claims (1)

An input shaft having an input gear on the outer periphery, an output shaft having an output gear on the outer periphery, arranged coaxially with the input shaft in a state where the shaft ends face each other, and a fixed arrangement that covers the opposite ends of the input shaft and the output shaft The outer ring, torque transmission means for transmitting the rotational torque of the input shaft to the output shaft, and the inner ring of the outer ring and the outer periphery of the output shaft can be freely engaged and disengaged. An engagement member that interrupts rotation transmission from the shaft to the input shaft, an elastic member that urges the engagement member in a direction to engage with the inner periphery of the outer ring and the outer periphery of the output shaft, and the engagement member when the input shaft rotates. In the reverse input cutoff clutch comprising the unlocking means for displacing to the disengagement position against the elasticity of the elastic member,
A reverse input cutoff clutch, wherein at least one of the input gear and the output gear is formed integrally with a corresponding input shaft or output shaft.

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