JP2009052663A - Reverse input-preventing clutch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reverse input-preventing clutch, reducing the axial dimension of a lock part to be designed in a compact manner. <P>SOLUTION: In a locking means, a plate-like plate engagement element 11 whose outer periphery is provided with an engagement surface 11a engaged with an inside diameter surface of a housing member 3 as a stationary member is freely turnably and pivotally supported to a cylinder part 9 provided on an output side member 2 with the plate surface pointing in the axial direction, and energized in the direction of engaging with the inside diameter surface of the housing member 3 by an elastic member. For the reverse-input torque, the plate engagement element 11 is engaged with the housing member 3 to lock the output side member 2 on the housing member 3. In a lock release means, an input side member 1 is engaged with the pivotally supported plate engagement element 11, and the plate engagement element 11 is turned in the direction of separating from the housing member 3, thereby reducing the axial dimension of the lock part to be designed in a compact manner. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a reverse input prevention clutch having a function of transmitting torque from an input side to an output side but blocking transmission of reverse input torque from the output side to the input side.

  Some devices that transmit torque from the input side to the output side are required to have a function of blocking transmission of reverse input torque from the output side to the input side. For example, in an electric shutter or a vehicle seat lifter, when the shutter or the seat is raised to a predetermined position by a torque input from an electric motor or a manual operation lever or the like and stopped, the weight of the shutter or the person sitting on the seat A reverse input blocking function is required to prevent the shutter and the seat from being lowered by the reverse input torque from the output side due to weight or the like.

  As a device having such a reverse input blocking function, an input side member to which torque is input and an output side member to which torque is output are arranged so as to face each other on the same axis, and further, the stationary member restricts the rotation of the output side member. The members are arranged coaxially with them, and torque transmitting means for transmitting torque from the input side member to the output side member, and a lock for locking the output side member to the stationary member against the reverse input torque from the output side member And unlocking means for releasing the locked state of the output side member with respect to the lock side torque from the input side member input in a direction to further lock the output side member locked by the locking means. A reverse input preventing clutch has been proposed (see, for example, Patent Document 1).

  In Patent Document 1, as a locking means for locking the output side member to the stationary member, a circumferential surface provided on the stationary member and a cam surface provided on the output side member are opposed to each other. A wedge gap is formed in the gap, and a plurality of rollers as engaging members interposed in the wedge gap are urged by an elastic member in a direction to engage with the cam surface of the output side member, and the reverse input torque is output from the output side member. A means for locking the output-side member to the stationary member by engaging the rolling roller with the cam surface when the action is applied is adopted.

JP 2002-266902 A

  The reverse input prevention clutch described in Patent Document 1 uses a roller as an engaging member that locks the output side member to the stationary member, so that the length of the roller is secured so that the rolling roller does not fall down in the lateral direction. There is a need to. For this reason, the axial direction dimension of the lock part by a roller becomes large, and there exists a problem which a compact design is inhibited.

  Accordingly, an object of the present invention is to provide a reverse input preventing clutch that can be designed compactly by reducing the axial dimension of the lock portion.

  In order to solve the above-mentioned problems, the present invention is arranged such that an input side member to which torque is input and an output side member to which torque is output are disposed on the same axis and further constrains rotation of the output side member. A stationary member that is coaxially disposed therewith, torque transmitting means for transmitting torque from the input side member to the output side member, and the output side member for the reverse input torque from the output side member Locking means for locking to the stationary member, and lock state of the output side member with respect to the lock side torque input from the input side member in a direction to further lock the output side member locked by the locking means. In the reverse input preventing clutch provided with the unlocking means for releasing, the torque transmitting means is arranged in a circumferential direction with a cylindrical portion protruding in the axial direction toward the input side member facing the output side member. The connecting member is provided with a connecting hole into which the cylindrical portion is fitted in the input side member, and torque is applied from the input side member to the output side member by engaging the protruding portion with the connecting hole. A cylinder having a plate-like plate engaging element having an engaging surface engaging with the stationary member on an outer periphery thereof, the plate surface being directed in the axial direction, and provided on the output side member; The plate engaging member pivotally supported by a part or all of the portion is urged by an elastic member in a direction in which the plate engaging member pivotally supported is engaged with the stationary member, and against the reverse input torque. The plate engaging element is engaged with the stationary member, the output side member is locked to the stationary member, and the unlocking means is operated when the lock side torque is input from the input side member. , The pivotally supported plate And engaged with the input-side member to the child, the plate engager employing the configuration assumed for rotating the direction away from said stationary member.

  In other words, the torque transmitting means is provided with cylindrical portions protruding in the axial direction toward the input side member facing the output side member at a plurality of positions in the circumferential direction, and connecting holes into which these cylindrical portions are fitted into the input side member are provided. By providing engagement between these protrusions and the coupling hole, torque is transmitted from the input side member to the output side member, and the locking means is a plate having an engagement surface that engages with the stationary member on the outer periphery. The plate engagement element is pivotally supported on a part or all of the columnar portion provided on the output side member with the plate surface directed in the axial direction, and the pivotally supported plate engagement element. The release member is urged by the elastic member in the direction to engage the stationary member, the plate engagement element is engaged with the stationary member against the reverse input torque, and the output side member is locked to the stationary member. The lock side torque is input from the input side member. In this case, the input side member is engaged with the pivotally supported plate engaging element, and the plate engaging element is rotated in the direction away from the stationary member, thereby reducing the axial dimension of the lock portion. So that it can be designed compactly. The plate engaging element pivotally supported does not fall down like a rolling roller even if the axial dimension is reduced.

  As a means for rotating the plate engagement element in the direction of releasing from the stationary member when the lock side torque is input, the columnar part is located at the center of the connection hole between the columnar part and the connection hole. In the neutral state, a clearance δ1 in the rotational direction is formed on one side, a protrusion projecting in the axial direction is provided on the outer peripheral side where the connection hole of the input side member is provided, and the input to the plate engaging element A long hole extending in the rotation direction of the side member and into which the protrusion is fitted is provided, and in the neutral state, between the protrusion and the long hole, on the rotation direction side due to the lock side torque of the input side member. It is possible to employ a configuration in which a gap δ2 smaller than the gap δ1 between the cylindrical portion and the connecting hole is formed.

  That is, when the input side member is rotated from the neutral state by the lock side torque, first, the projection of the input side member having a small gap δ2 hits the inner surface of the long hole of the plate engaging element, and the plate engaging element is detached from the stationary member. The lock state is released by tilting in a downward direction, and then the inner surface of the connection hole of the input side member hits the cylindrical portion of the output side member, and the lock side torque is transmitted to the output side member. I did it. When torque in the direction opposite to the lock side torque is input from the input side member, the projection of the input side member does not hit the inner surface of the long hole of the plate engaging element, and the inner surface of the connection hole of the input side member is output. When it hits the cylindrical part of the side member, the plate engaging element naturally rotates in a direction to release the locked state of the output side member, and torque is transmitted to the output side member.

  By locking a plurality of the plate engaging elements in the circumferential direction of the output side member, the locking ability of the output side member can be enhanced.

  By providing flexibility to the cylindrical portion of the output side member, when an excessive reverse input torque is generated, the cylindrical portion is bent so that the engagement surface of the plate engagement element is released from the stationary member, and the torque is increased. A limiter function can be provided.

  By using the stationary member as a cylindrical housing member that includes the input side member and the output side member including at least the facing portions thereof, a separate housing can be dispensed with.

  The plate engaging element may be engaged with an inner diameter surface of a stationary member that is the cylindrical housing member.

  By attaching a fixing plate having a center hole into which the input side member or the output side member is inserted and a flange fixed to a fixing part to the housing member, the reverse input preventing clutch can be easily fixed. it can.

  The fixing plate is attached to one end of the housing member, an inward flange is provided on the other end of the housing member, and one of the inner diameter surface of the center hole of the fixing plate and the inner diameter surface of the inward flange By providing the bearing portion of the input side member on the other side and providing the bearing portion of the output side member on the other side, the input side member and the output side member can be supported without providing a separate bearing portion.

  In the reverse input prevention clutch of the present invention, the torque transmission means is provided with cylindrical portions protruding in the axial direction toward the input side member facing the output side member at a plurality of positions in the circumferential direction, and these cylindrical portions are provided on the input side member. A coupling hole into which the locking member is fitted is provided, and torque is transmitted from the input side member to the output side member by engagement between the protruding portion and the coupling hole, and the locking means engages with the stationary member. A plate-like plate engaging element having a surface on the outer periphery is pivotally supported by a part or all of a cylindrical portion provided on the output side member with the plate surface directed in the axial direction. The plate engaging member pivotally supported by the elastic member is urged by the elastic member in the direction to engage the stationary member, and the plate engaging member is engaged with the stationary member against the reverse input torque, and the output side member is locked to the stationary member. The lock release means from the input side member. When the side torque is input, the input side member is engaged with the axially supported plate engaging element, and the plate engaging element is rotated in the direction of detachment from the stationary member. The direction dimension can be reduced and the design can be made compact.

  By locking a plurality of the plate engaging elements in the circumferential direction of the output side member, the locking ability of the output side member can be enhanced.

  By providing flexibility to the cylindrical portion of the output side member, when an excessive reverse input torque is generated, the cylindrical portion is bent so that the engagement surface of the plate engagement element is released from the stationary member, and the torque is increased. A limiter function can be provided.

  By using the stationary member as a cylindrical housing member including the input side member and the output side member including at least the facing portions thereof, a separate housing can be eliminated.

  The reverse input prevention clutch can be easily fixed by attaching a fixing plate having a center hole into which the input side member or the output side member is inserted and a flange fixed to the fixing part to the housing member.

  The fixing plate is attached to one end side of the housing member, an inward flange is provided on the other end side of the housing member, and the input side member is provided on one of the inner diameter surface of the center hole of the fixing plate and the inner diameter surface of the inward flange. By providing the bearing portion of the output side member on the other side, the input side member and the output side member can be supported without providing a separate bearing portion.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, the reverse input preventing clutch is configured such that an input side member 1 to which torque is input and an output side member 2 to which torque is output are coaxially opposed to each other. A cylindrical housing member 3 containing these opposing portions is coaxially arranged as a stationary member for restraining the rotation of the member 2. The input side member 1 is disposed on the input side member 1 side of the housing member 3. A fixing plate 4 having a center hole into which the housing member 3 is inserted and a flange 4a fixed to the fixing portion is attached. An inward flange 3a is provided on the output side member 2 side of the housing member 3, and the fixing plate 4 is provided. The inner diameter surface of the central hole and the inner diameter surface of the flange 3a of the housing member 3 serve as bearing portions that rotatably support the input side member 1 and the output side member 2, respectively.

  A pair of notches 3 b facing each other in the circumferential direction are provided at the end of the housing member 3 on the input side member 1 side, and ends having the pair of notches 3 b are provided on the fixed plate 4. The fixing plate 4 is secured to the housing member 3 by a retaining ring 5 that is fitted into the pair of arc-shaped holes 4 b and is attached to the outer diameter surface of the housing member 3. The flange 4a of the fixing plate 4 is provided with a bolt hole 6 for fixing to a fixing part.

  The input side member 1 and the output side member 2 include shaft portions 1a and 2a and flange portions 1b and 2b, respectively, and are arranged so that these flange portions 1b and 2b face each other. Are connected to the input side and the output side by splines 7a and 7b, respectively.

  Also, O-rings 8a and 8b for sealing between the fixing plate 4 and the inner surface of the flange 3a of the housing member 3 are provided on the outer surfaces of the flange portions 1b and 2b of the input side member 1 and the output side member 2, respectively. Is mounted, and the inside of the housing member 3 provided with a lock portion and a torque transmission portion by a plate engaging element 11 described later is sealed. Grease is filled in the housing member 3 sealed by the O-rings 8a and 8b so as to prevent wear and seizure at the lock portion and the torque transmission portion.

  As shown in FIGS. 1 and 3, the flange portion 2b of the output side member 2 has four cylindrical portions 9 protruding in the axial direction toward the flange portion 1b side of the opposing input side member 1 at a 90 ° phase. A torque transmitting portion that transmits the torque from the input side member 1 to the output side member 2 by inserting each of the cylindrical portions 9 into the connecting hole 10 provided in the flange portion 1b of the input side member 1; It is supposed to be formed.

  Further, of the cylindrical portions 9, two cylindrical portions 9 facing each other at a phase of 180 ° are formed of separate flexible resins, and these cylindrical portions 9 are provided with plate-like plate engaging elements. 11 is pivotally supported so that the plate surface is rotatable in the axial direction, and the contour around the shaft fulcrum changes on the outer periphery of each plate engaging element 11, and the inner diameter surface of the housing member 3 as a stationary member. An engaging surface 11a to be engaged is provided. Each plate engaging element 11 is restricted from moving in the axial direction and falling of the plate surface by the flange portion 1b of the input side member 1 facing each other.

  As shown in FIGS. 3 and 4, the plate engaging element 11 is a torsion coil spring 12 as an elastic member attached to the cylindrical portion 9, and the engaging surface 11 a is engaged with the inner diameter surface of the housing member 3. H is biased counterclockwise around the cylindrical portion 9. Therefore, when the output side member 2 tries to rotate clockwise in FIG. 3 due to the reverse input torque, the engagement surface 11a of each plate engaging element 11 is engaged with the inner diameter surface of the housing member 3, and the output side member 2 Is locked to the housing member 3 to block transmission of reverse input torque to the input side member 1. Further, when excessive reverse input torque is generated, the flexible cylindrical portion 9 exhibits a torque limiter function, and in a direction to release the engagement surface 11 a of the plate engagement element 11 from the inner diameter surface of the housing member 3. The bending and the plate engaging element 11 are prevented from being locked excessively firmly.

  As shown in FIG. 3, a gap δ <b> 1 in the rotational direction is formed between each cylindrical portion 9 and the coupling hole 10 in a neutral state where the cylindrical portion 9 is located at the center of the coupling hole 10. It has become. Further, on the outer peripheral side of the flange portion 1b of the input side member 1 provided with the connecting hole 10, columnar protrusions 13 are provided at two positions with a phase of 180 °. The projection 13 is fitted, and a long hole 14 extending in the rotation direction of the input side member 1 is provided. On the clockwise side of the projection 13 fitted in each long hole 14, A gap δ2 in the rotational direction smaller than the gap δ1 is formed between the elongated hole 14 and the elongated hole 14. A sufficiently large gap is formed on the counterclockwise side of the protrusion 13.

  Next, a lock releasing means for releasing the locked state of the output side member 2 will be described. In the neutral state, a lock-side torque in a direction for further locking the output-side member 2 in the locked state is input from the input-side member 1, and as shown in FIG. , The gap δ2 disappears, each projection 13 of the input side member 1 hits the inner surface of the long hole 14 of each plate engaging element 11, and each plate engaging element 11 falls in the clockwise direction. Thus, the lock by the plate engaging element 11 is released. Thereafter, when the input side member 1 further rotates clockwise, the gap δ1 disappears, the inner surface of each connection hole 10 of the input side member 1 hits each cylindrical portion 9 of the output side member 2, and the input torque is output side. It is transmitted to the member 2.

  Although illustration is omitted, when a torque in the direction opposite to the lock side torque is input and the input side member 1 rotates counterclockwise in FIG. 5, each protrusion 13 of the input side member 1 is connected to each plate engagement element. 11 and the inner surface of each coupling hole 10 of the input side member 1 hits each columnar portion 9 of the output side member 2, the plate engaging element 11 is locked. The input torque is transmitted to the output side member 2 while the plate engagement element 11 is released naturally and is in sliding contact with the inner diameter surface of the housing member 3.

  In the above-described embodiment, the protrusion of the input side member constituting the lock release means is engaged with the elongated hole provided in the plate engaging element, but the protrusion of the input side member is engaged with the plate engaging element. It can also be made to engage with the outer peripheral surface. In this case, in the neutral state, a gap smaller than the gap δ1 may be formed between the protrusion of the input side member and the outer peripheral surface of the plate engagement element.

  In the above-described embodiment, the plate engaging element constituting the locking means is pivotally supported on a part of the cylindrical part of the output side member constituting the torque transmitting means. However, the plate engaging element is pivotally supported on the entire cylindrical part. May be. Furthermore, although the elastic member for urging the plate engaging element is a torsion coil spring mounted on the cylindrical portion, this elastic member can be a plate spring or the like, and the mounting method is also limited to that of the embodiment. There is nothing.

Vertical front view showing an embodiment of a reverse input prevention clutch Side view from the input side member side of FIG. Sectional view along line III-III in FIG. The disassembled perspective view which shows the mounting method of the torsion coil spring which urges | biases the plate engagement element of FIG. Sectional drawing explaining the state by which the lock | rock by the plate engagement element of FIG. 3 is cancelled | released

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Input side member 2 Output side member 1a, 2a Shaft part 1b, 2b Flange part 3 Housing member 3a Flange 3b Notch 4 Fixing plate 4a Flange 4b Arc-shaped hole 5 Retaining ring 6 Bolt hole 7a, 7b Spline 8a, 8b O-ring 9 Cylindrical part 10 Connecting hole 11 Plate engaging element 11a Engaging surface 12 Torsion coil spring 13 Protruding part 14 Long hole

Claims (8)

  An input side member to which torque is input and an output side member to which torque is output are arranged so as to face each other coaxially, and a stationary member that restrains rotation of the output side member is arranged coaxially with these members, Torque transmitting means for transmitting torque from the input side member to the output side member, locking means for locking the output side member to the stationary member against reverse input torque from the output side member, and the locking means A reverse input preventing clutch provided with a lock releasing means for releasing the locked state of the output side member with respect to the lock side torque input from the input side member in a direction to further lock the output side member in the locked state. The torque transmitting means is provided with cylindrical portions protruding in the axial direction toward the input side member facing the output side member at a plurality of positions in the circumferential direction, and the input side member is A connecting hole into which the cylindrical portion is fitted, and torque is transmitted from the input-side member to the output-side member by engagement between the projecting portion and the connecting hole. A plate-like plate engagement element having an engagement surface that engages with a stationary member on the outer periphery is rotatable to a part or all of the cylindrical portion provided on the output side member with the plate surface directed in the axial direction. The plate engaging member pivotally supported is urged by an elastic member in a direction to engage the stationary member with the stationary member, and the plate engaging member is moved to the stationary member with respect to the reverse input torque. The output side member is locked to a stationary member by engaging, and when the lock side torque is input from the input side member, the unlocking means is connected to the plate engaging member supported by the shaft. Engage the input side member Reverse input prevention clutch, characterized in that the door engager was assumed to rotate the direction away from said stationary member.   A means for rotating the plate engagement element in a direction to release from the stationary member when the lock side torque is input is a neutral position in which the columnar part is located at the center of the connection hole between the columnar part and the connection hole. In the state, a clearance δ1 in the rotational direction is formed on one side, a protrusion projecting in the axial direction is provided on the outer peripheral side provided with the connection hole of the input side member, and the plate engaging element is provided with the input side A long hole extending in the rotation direction of the member and into which the protrusion fits is provided, and in the neutral state, between the protrusion and the long hole, on the rotation direction side due to the lock side torque of the input side member, The reverse input prevention clutch according to claim 1, wherein a gap δ2 smaller than the gap δ1 between the cylindrical portion and the connecting hole is formed.   3. The reverse input preventing clutch according to claim 1, wherein a plurality of the plate engaging elements are pivotally supported in a circumferential direction of the output side member.   The reverse input prevention clutch according to any one of claims 1 to 3, wherein flexibility is imparted to the cylindrical portion of the output side member.   The reverse input prevention clutch according to any one of claims 1 to 4, wherein the stationary member is a cylindrical housing member that includes the input side member and the output side member including at least the facing portions.   The reverse input prevention clutch according to claim 5, wherein the plate engaging element is engaged with an inner diameter surface of a stationary member as the cylindrical housing member.   The reverse input prevention clutch according to claim 5 or 6, wherein a fixing plate having a center hole into which the input side member or the output side member is inserted and a flange fixed to a fixing portion is attached to the housing member.   The fixing plate is attached to one end of the housing member, an inward flange is provided on the other end of the housing member, and one of the inner diameter surface of the center hole of the fixing plate and the inner diameter surface of the inward flange The reverse input prevention clutch according to claim 7, wherein a bearing portion of the input side member is provided on the other side, and a bearing portion of the output side member is provided on the other side.

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