JP5655024B2 - Reverse input cutoff clutch - Google Patents

Description

  The present invention relates to a reverse input cutoff clutch in which input from the input member side is transmitted to the output member side, and reverse input from the output member side is not transmitted to the input member side.

  There has already been proposed a bidirectional reverse input cutoff clutch in which the rotational driving force from the input side which is the driving side is transmitted to the output side which is the driven side, and the rotational driving force from the output side is not transmitted to the input side. As this kind of reverse input shut-off clutch having a relatively simple structure, an input member having a plurality of input engagement pieces extending radially outward at regular intervals and a plurality of output engagements extending radially outward at regular intervals A combination of an output member having a piece, an engagement member made of a roller or a ball, and an outer ring member is disclosed (for example, see Patent Documents 1 and 2).

  In the reverse input cutoff clutch described in the above-mentioned Patent Documents 1 and 2, a plurality of input engagement pieces and output engagement pieces are inserted into each other, and the front end surface of the output engagement piece and the cylindrical inner surface of the outer ring member An engaging member is disposed between the two. In this reverse input shut-off clutch, when input is applied to the input member in any rotation direction, the input member first starts rotating in the input direction, and the input engagement piece is connected to the output engagement piece and the engagement member. By directly pressing both the input member, the input member, the output member, and the engaging member rotate together, whereby the input is transmitted to the output side. On the other hand, when rotational force, that is, reverse input is applied to the output member, the output engagement piece is displaced by a small angle between the adjacent input engagement pieces and the input engagement pieces are input. Before the contact with the engagement piece, the engagement member bites into and locks into a narrow gap portion between the tip end face of the output engagement piece and the cylindrical inner surface of the outer ring member, so that the output member cannot be displaced any further. Therefore, this type of reverse input cutoff clutch basically has a structure in which a reverse input is not transmitted to the input member even if a reverse input is applied to the output member.

  In addition, the lock release is performed by the input engagement piece directly pressing the engagement member or the output engagement piece depending on whether the engagement member is inserted into the left or right of the outer ring member or the output engagement piece and is locked. Is performed by moving in a wide space direction between the front end surface of the output engagement piece and the cylindrical inner surface of the outer ring member. In other words, the reverse input cutoff clutch having such a structure allows the input / output transmission, the lock and the unlocking by the movement of the output engagement piece displaced by a small angle between the adjacent input engagement pieces. Is known to take place. Such a reverse input cutoff clutch has a structure in which rotational input in both directions is transmitted to the output member, and basically the reverse input acting on the output member is not transmitted to the input member in either direction.

  However, in practice, it has been found that the following problems occur in the conventional reverse input cutoff clutch of this type of structure. In general, an engaging member made of a roller, a ball, or the like has a structure that is easy to move from the operation of the reverse input cutoff clutch. Therefore, in particular, when the output member moves due to reverse input in either direction acting on the output member, the engagement member that is easy to move may move together due to the contact resistance with the output member. There is a case where it does not bite between the outer ring member and the outer ring member in a short time. That is, when a reverse input is applied to the output member, the engagement member cannot lock the output member to the outer ring member in a short time, so the output member comes into contact with the input member before entering the locked state, The reverse input which acted on the output member may be transmitted to the input member.

  Further, in the conventional reverse input cutoff clutch, as described above, the individual engaging members are easy to move, so the reverse input in either direction acts on the output member to move the output member. Sometimes, only one engagement member first bites between the output member and the outer ring member to lock the output member to the outer ring member, and other engagement members tend not to bite between the output member and the outer ring member. . In this case, only a part of the engagement members bears most of the load coupled to the output member, and only the part of the engagement members are worn, so that the life of the reverse input cutoff clutch is shortened. There is a problem of shortening.

JP 2001-214945 A JP 2008-101715 A

  An object of the present invention is to solve the above-described conventional problems. When a reverse input is applied to an output member, the engagement member immediately locks the output member so that the reverse input applied to the output member is input to the input member. By reliably sharing the load with all the engaging members when the output member is locked, a long-life and highly reliable reverse cutoff clutch is provided. This is the issue.

According to a first aspect of the present invention, there is provided an input member having an input engagement piece extending outward at a constant interval, an output member comprising an output engagement piece capable of entering and engaging with the input engagement piece , and a cylindrical shape An outer ring member having an inner surface and a cylindrical outer surface; and between the input engaging piece and the input engaging piece adjacent to each other, a tip surface of the output engaging piece, and the cylindrical inner surface of the outer ring member and a one engaging member located between the input acting on the input member is transmitted to the output member by the input engaging piece presses with the engaging member and the output engagement piece, The reverse input acting on the output member is not transmitted to the input member by the engagement member being locked between the front end surface of the output engagement piece and the cylindrical inner surface of the outer ring member. The engaging member is at least the outer ring member Comprising a braking member that gives a braking force for braking the movement of the either direction along said cylindrical inner wall surface to the engaging member, said braking member, said cylindrical inner surface of the outer ring member directly presses friction A spring portion that generates a force and generates the braking force by the frictional force, and a braking piece that holds and brakes the engaging member , and an input that acts on the input member and a reverse input that acts on the output member are Proposed is a reverse input cutoff clutch that is transmitted to the braking member via the engaging member.

In a second aspect based on the first aspect, the braking force acting on the engaging member is of such a magnitude that the engaging member does not move when no external force acts on the engaging member. A reverse input cutoff clutch is proposed.

According to a third aspect of the present invention , in the first aspect or the second aspect, the braking force acting on the engaging member is the speed of movement of the output member due to the reverse input. A reverse input shut-off clutch is proposed, which is larger than a value for braking the engagement member so as to be slower than a moving speed.

  ADVANTAGE OF THE INVENTION According to this invention, it is possible to prevent reliably the reverse input which acts on an output member being transmitted to an input member, and it is possible to provide a reverse direction interruption clutch with a long lifetime and high reliability.

The example which looked at each member before the assembly of the reverse input interruption | blocking clutch which concerns on Embodiment 1 of this invention from the diagonal is shown. It is a figure which shows an example of the braking member of the reverse input interruption | blocking clutch which concerns on Embodiment 1 of this invention. It is a figure which shows the cross section of the reverse input interruption | blocking clutch which concerns on Embodiment 1 of this invention. It is a figure for demonstrating operation | movement of the reverse input interruption | blocking clutch which concerns on Embodiment 1 of this invention. It is a figure for demonstrating the reverse input interruption | blocking clutch which concerns on Embodiment 2 of this invention. It is a figure for demonstrating the reverse input interruption | blocking clutch which concerns on Embodiment 3 of this invention. It is a figure for demonstrating the reverse input interruption | blocking clutch which concerns on Embodiment 4 of this invention. It is a figure for demonstrating the reverse input interruption | blocking clutch which concerns on Embodiment 5 of this invention.

  The reverse input cut-off clutch according to the present invention is engaged by the braking force of the braking member when reverse input is applied to the output member to which the movable member (load) in the printing apparatus or the game machine is coupled due to the weight of the load. Since the member does not move, all the engaging members bite between the output member and the outer ring member in a short time to be in a locked state, so that the reverse input is not reliably transmitted to the input member.

  Embodiments of the present invention will be described with reference to the accompanying drawings. The present invention is not limited to the embodiments described below, and is included in the present invention without departing from the technical idea of the present invention. The term reverse input used in the present invention means a force acting on the output member due to the weight of the load coupled to the output member, an external force, or the like. In addition, in this specification and drawing, the component with the same code | symbol shall show the member of the same name. In addition, illustration is abbreviate | omitted about the member which is not especially required when describing operation | movement of this invention.

[Embodiment 1]
A reverse input cutoff clutch according to a first embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, this reverse input shut-off clutch includes an input member 1 that mainly receives a clockwise and counterclockwise force, an output member 3 to which a load (not shown) is coupled, an engagement member 5 composed of a roller or a ball, and the like. The brake member 7 that brakes the engaging member 5, the outer ring member 9, and the shield member (lid) 11 are combined. Since the input member 1 and the output member 3 are basically the same as those described in the above-mentioned Patent Document 2, the description will be simplified.

  As shown in FIG. 1, the input member 1 includes an input engaging portion 1B having a central hole 1A, and a first extending radially outward (in the direction of the outer ring member 9 when assembled) from the input engaging portion 1B at regular intervals. Input engagement piece 1C and second input engagement piece 1D. The interval between the adjacent input engagement pieces 1 </ b> C and the input engagement pieces 1 </ b> C is larger than the diameter of the engagement member 5 in the rotation direction by a predetermined dimension. The first input engagement piece 1C is located outside the second input engagement piece 1D, and a gap between the input engagement piece 1C and the input engagement piece 1D is formed by a brake member 7 described later at the time of assembly. It has a gap width that can receive the brake piece 7D (FIG. 2), that is, a gap width that is somewhat larger than the thickness of the brake piece 7D. In the center hole 1A, an input shaft coupled to a rotating shaft of a motor (not shown) is inserted and fixed. There is a minute gap between the outermost surface of the first input engagement piece 1 </ b> C and the cylindrical inner surface of the outer ring member 9 so that the input member 1 stably rotates in the outer ring member 9. preferable. In the first embodiment, the number of the first input engagement pieces 1C having a congruent shape and the number of the second input engagement pieces 1D having a congruent shape are five, respectively, but may be three or more.

  As shown in FIG. 1, the output member 3 includes an output shaft portion 3A, an output engagement portion 3B integrally formed at one end portion thereof, and a radially outward direction from the output engagement portion 3B at a constant interval. The output engagement piece 3C extends. In the first embodiment, since the number of the first input engagement pieces 1C is five, the number of the output engagement pieces 3C is also five. However, if there are three or more, the stable reverse input cutoff clutch function can be achieved. it can. When the input member 1 and the output member 3 are combined, each output engagement piece 3C has a gap between the adjacent first input engagement piece 1C and the input engagement piece 1C, and the adjacent second input engagement member. It exists in the position corresponding to the space | gap between the joint piece 1D and the input engagement piece 1D.

  That is, when the input member 1 and the output member 3 are combined, at least each output engagement piece 3C is located between the adjacent second input engagement piece 1D and input engagement piece 1D. The engagement member 5 is received between the front end surface 3C1 of each output engagement piece 3C and the cylindrical inner surface 9A of the outer ring member 9, and the engagement member 5 is connected to the front end surface 3C1 of the output engagement piece 3C and the outer ring member. There is a space that can perform a clutch function to be described later between the cylindrical inner surface of 9. When the input member 1 rotates due to the input, depending on whether the engaging member 5 is engaged with and locked to the left or right of the output engaging piece 3C, the side wall in the rotational direction of the input engaging piece 1C is initially the engaging member. 5 is pushed, or the second input engagement piece 1D pushes the output engagement piece 3C to release the locked state.

  Further, the width in the rotation direction of each output engagement piece 3C is narrower than the interval between the adjacent second input engagement pieces 1D and the input engagement pieces 1D, and the output engagement pieces 3C are adjacent to the second input engagement pieces. The joint piece 1D and the input engagement piece 1D can be displaced in the rotational direction by a set angle. It is preferable that all the output engagement pieces 3C have the same shape. The front end surface 3C1 of the output engagement piece 3C is gently curved, V-shaped, or flat, and forms a support surface that supports the engagement member 5. When the first input engagement piece 1C pushes the engagement member 5 and the second input engagement piece 1D pushes the output engagement piece 3C by the input being actuated, The combined member 5 is positioned substantially at the center of the distal end surface 3C1 of the output engagement piece 3C, and is not engaged between the output engagement piece 3C and the outer ring member 9 and is not locked. A D cut portion 3Aa is formed in the output shaft portion 3A.

  The engaging member 5 is, for example, a roller (roller), a ball, an elliptical body, or the like, and is not particularly limited in shape as long as the surface that contacts the distal end surface 3C1 of the output engaging piece 3C shown in FIG. Further, the number of engaging members 5 is preferably the same as the number of output engaging pieces 3C, but if it is three or more, it operates stably. In a state where the reverse input shut-off clutch is assembled, the engagement member 5 is composed of the adjacent input engagement piece 1C, the input engagement piece 1C, the distal end surface 3C1 of the output engagement piece 3C, and the cylindrical inner surface 9 of the outer ring member 9. Located in the enclosed space. When the engaging member 5 is positioned approximately at the center of the distal end surface 3C1 of the output engaging piece 3C, the engaging member 5 does not lock the output member 3 and the outer ring member 9, but the output member 3 is displaced in either direction. By doing so, when the engaging member 5 is in a position biased to any one end side of the distal end surface 3C1 of the output engaging piece 3C, the engaging member 5 is caught between the output member 3 and the outer ring member 9 to lock them.

  The braking member 7 of the first embodiment is manufactured by molding a synthetic resin having excellent wear resistance and elasticity. As shown in FIGS. 2A and 2B, the braking member 7 has a gap between the main body 7A and the annular main body 7A having a hole 7A1 through which the output shaft 3A of the output member 3 is inserted. There exists a part of the flange portion 7B that is coupled to the main body portion 7A, and a spring portion 7C that generates a frictional force between the cylindrical inner surface of the outer ring member 9, and protrudes from the main body portion 7A in the axial direction at regular intervals. It consists of a braking piece 7D. The braking member 7 applies a braking force to the engaging member 5 and holds the engaging member 5 so that all the engaging members 5 are locked almost simultaneously when the output member 3 and the outer ring member 9 are locked. It works as a retainer. The hole 7A1 of the main body portion 7A has a diameter somewhat larger than the diameter of the output shaft portion 3A of the output member 3.

  A pair of spring portions 7C are provided, and the central portion of each spring portion 7C is coupled to the main body portion 7A by a coupling portion 7C1. Arc-shaped projections 7C2 are formed outside both ends of each spring portion 7C. As shown in FIG. 3, the arc-shaped projection 7C2 of the spring portion 7C is a cylinder of the outer ring member 9 after assembly. The inner surface 9A is pressed. Therefore, a frictional force acts between the arcuate protrusion 7C2 of the spring portion 7C and the cylindrical inner surface 9A of the outer ring member 9 due to the elastic force of the spring portion 7C, and the engagement member 5 becomes the cylindrical inner surface of the outer ring member 9. When moving along 9 </ b> A, the braking member 7 applies a braking force to the engaging member 5.

  The braking force of the braking member 7 is determined by the magnitude of the frictional force acting between the arcuate protrusion 7C2 of the spring portion 7C and the cylindrical inner surface 9A of the outer ring member 9. In the first embodiment, the braking force of the braking member 7 does not move unless the engaging member 5 is self-weighted, that is, when an external force is applied, in order to make the input (driving force) acting on the input member 1 as small as possible. It is desirable that the frictional force be as small as possible. In a small reverse input shut-off clutch, the braking force is small enough, and the frictional force has such a magnitude that the required input and the rotational operation are not substantially affected. Therefore, the braking force of the braking member 7 is a value that does not move the engaging member 5 unless an external force in the rotational direction is applied to the engaging member 5 or a value larger than that.

  Since the brake piece 7D has five input engagement pieces 1C, output engagement pieces 3C, and five engagement members 5, five congruent ones are formed. The gap between the adjacent braking piece 7D and the braking piece 7D is the gap between the adjacent first input engagement piece 1C and the input engagement piece 1C, and the adjacent second input engagement piece 1D and the input engagement. The engagement member 5 is held smaller than the gap between the piece 1D. As shown in FIG. 3, when the brake piece 7D is located between the first input engagement piece 1C and the second input engagement piece 1D and the engagement member 5 is a roller, the length of the roller A part of the direction, for example, the output engagement piece 3C side (right side part) of the roller is held from both sides in the rotational direction.

  Accordingly, since a braking force is applied to the engaging members 5 held by the brake pieces 7D on both sides, the engaging member 5 does not move unless an external force is applied, and the output engaging piece 3C is displaced by reverse input. At this time, all the engagement members 5 immediately and simultaneously bite between the front end surface 3C1 of the output engagement pieces 3C and the cylindrical inner surface 9A of the outer ring member 9 to be locked. By this locking operation, the reverse input acting on the output member 3 is reliably cut off, so that the reverse input is not transmitted to the input member 1. In addition, since only a part of the engaging members 5 is not subjected to a load load and the load load is equally shared, only a part of the engaging members 5 is not worn. Improve lifespan at the same time.

  As shown in FIG. 1, the outer ring member 9 has a cylindrical inner surface 9 </ b> A, a cylindrical outer surface 9 </ b> B having a locking portion 9 </ b> B <b> 1 that is locked to a housing (not shown), and a through hole through which the output shaft portion 3 </ b> A of the output member 3 is inserted. And an annular end wall 9C having 9C1. In FIG. 1, the locking portion 9 </ b> B <b> 1 is shown as a protrusion, but may be a recess such as a groove. After assembling the respective members and storing them in the outer ring member 9, the annular shield member 11 is fixed to the outer ring member 9. This fixing is performed by a general method such as spot welding or press fitting. The shield member 11 has an insertion hole 11A through which a part of the input engagement portion 1B of the input member 1 is inserted.

  First, as shown in FIG. 4A, a load (not shown) coupled to the output member 3 is moved upward, that is, the clockwise direction opposite to the reverse input acting on the output member 3 (direction of arrow X). Next, the case where the input member 1 is rotated will be described. When an input in the direction of the arrow X is applied to the input member 1, the first and second input engagement pieces 1C and 1D move in the direction of the arrow X, and the first input engagement piece 1C moves the engagement member 5 to the arrow. The second input engagement piece 1D hits the output engagement piece 3C and is pushed in the direction of the arrow X. At this time, the engagement member 5 moves somewhat in the direction of the arrow X while being braked by the brake member 7, and is positioned at the approximate center of the distal end surface 3C1 of the output engagement piece 3C, and the locked state is released. The In this case, the input acting on the input member 1 is transmitted to the braking member 7 via the engaging member 5.

  When the locked state is released, the input member 1 causes the output member 3, the engaging member 5 and the braking member 7 to rotate together with the input member 1 in the direction of the arrow X, and input / output is transmitted. At this time, as described above, a frictional force is generated between the braking member 7 and the outer ring member 9, but if the frictional force is very small, the operation for transmitting the input acting on the input member 1 to the output member 3 is substantially performed. There is no negative impact.

  Next, a case where a load (not shown) coupled to the output member 3 reaches a set upper set position and drives the load downward will be described. When a load (not shown) reaches the set upper set position, the input that once worked on the input member 1 becomes zero, but the output member 3 naturally has a counterclockwise direction (arrow) due to the weight of the load. The reverse input of Y direction is working. At this time, since the braking force of the braking member 7 is naturally applied to the engaging member 5, when the input applied to the input member 1 becomes zero, the engaging member 5 is applied with an external force in the direction of the arrow Y. Otherwise, it does not move freely, so when the output engagement piece 3C is displaced in the direction of arrow Y due to reverse input, each engagement member 5 is brought into contact between the output engagement piece 3C and the outer ring member 9 in a short time. It bites in at the same time and presents a locked state.

  In this locked state, as described above, each engaging member 5 bites between the respective output engaging pieces 3C and the outer ring member 9 at the same time to exhibit the locked state, so that only one engaging member 5 is present. Does not bite between the output engagement piece 3 </ b> C and the outer ring member 9 to exhibit a locked state. Accordingly, the wear of some of the engaging members 5 does not become severe, and this prevents the cylindrical inner surface 9A of the outer ring member 9 from being easily damaged. It is possible to provide a reverse input blocking clutch that can be improved and that can reliably block reverse input. In this state, unless the input member 1 is input in the direction of the arrow Y and pushes the engaging member 5 in the direction of the arrow Y, the locked state is not released. Therefore, the output member 3 is not moved by the reverse input. The reverse input acting on the output member 3 is not transmitted to the input member 1.

  In this state, as shown in FIG. 4B, the input in the direction of arrow Y, which is the same direction as the reverse input acting on the output member 3, acts on the input member 1, and the first and second input engagement pieces 1C. And 1D are displaced from the position indicated by the chain line to the position indicated by the solid line. Accordingly, the first and second input engagement pieces 1C and 1D on the upstream side of the rotation (upper side of the drawing) push the engagement member 5 and the output engagement piece 3C in the direction of the arrow Y. Is released. When the locked state is released, as described above, the output member 3, the engagement member 5, and the braking member 7 are rotated in the direction of the arrow Y by the input in the direction of the arrow Y acting on the input member 1. Input / output is transmitted between the output member 3 and the output member 3.

  When input / output is transmitted in this way, the input that has been applied to the input member 1 is removed, and when the input becomes zero, the input member 1 stops rotating. At the same time, the engaging member 5 is also stopped by the braking force of the braking member 7, but the output engaging piece 3C of the output member 3 tries to rotate by reverse input due to the load of a load (not shown). The members 5 bite between the respective output engagement pieces 3C and the outer ring member 9 in a short time, exhibit a locked state, and all the engagement members 5 bear the reverse input almost equally to ensure the reverse input. Can be blocked.

[Embodiment 2]
In the first embodiment, as shown in FIG. 2, the spring portion 7C is the braking member 7 having a structure formed integrally with the main body portion 7A. However, the reverse input cutoff clutch of the second embodiment is as shown in FIG. Further, the use of a braking member 7 having a structure in which a spring portion 7C formed separately from the main body portion 7A is attached to the main body portion 7A is different from that of the first embodiment. Since this point is different from the first embodiment, the braking member 7 will be mainly described. According to the braking member 7, the main body portion 7A can be formed of a synthetic resin or the like, and the spring portion 7C can be formed of a metal material or the like having excellent spring properties and wear resistance. The brake member 7 also holds the engaging member 5 and applies a braking force to the engaging member 5. FIG. 5 shows a state before the assembly of the input member 1, the output member 3, the engaging member 5 and the braking member 7 is stored in the outer ring member 9.

  The braking member 7 has an annular locking portion 7E formed so as to surround a hole through which the output shaft portion 3A of the output member 3 shown in FIGS. 1 and 3 is inserted, and the locking portion 7E has a radiation. An anti-rotation portion 7E1 extending outward is formed. The spring portion 7C is locked to the locking portion 7E so that the annular locking portion 7E is tightened by the spring force. The spring portion 7C is made of a spring body having a special shape, and a second portion that acts as a detent by tightening the first portion 7C3 that tightens the annular locking portion 7E by the spring force and the detent portion 7E1 of the braking member 7. And a third portion 7C5 that generates a frictional force between the outer ring member 9 and the cylindrical inner surface 9A of the outer ring member 9. The first portion 7C3 and the third portion 7C5 are substantially symmetrical with respect to the second portion 7C4. Also in the second embodiment, the braking force of the braking member 7 is about a value at which the engaging member 5 does not move unless an external force in the rotational direction acts on the engaging member 5 or larger. The brake piece 7D and the input engagement piece 1D shown in FIGS. 2 and 4 are not visible in FIG. 5, but are the same as in the first embodiment. Since the operation is the same as that of the first embodiment, the description thereof is omitted.

[Embodiment 3]
An example of the reverse input cutoff clutch according to the third embodiment will be described with reference to FIG. In the third embodiment, the braking member 7 does not include a spring portion that generates a frictional force between the outer ring member 9 and the cylindrical inner surface 9A, and a pressing force in the direction of the outer ring member 9 is applied to a part of the engagement member 5 to engage the braking member 7. The structure having a pressing portion 7F that presses the combined member 5 against the cylindrical inner surface 9A of the outer ring member 9, and the first input engagement piece 1C of the input member 1 is the first of the first and second embodiments described above. The second and second embodiments are different from the first and second embodiments in that the second input engagement pieces 1C and 1D are combined into one input engagement piece 1C. The braking member 7 is made of a highly elastic metal material or synthetic resin material, and includes a pressing portion 7F that can be deformed by an external force and a node portion 7G that is difficult to deform, and the pressing portions 7F and the node portions 7G are alternately positioned. To do. When no external force is applied, the pressing portion 7F and the node portion 7G are pentagonal annular ones. When an external force is applied, the pressing portion 7F is slightly deformed in the center direction of the outer ring member 9. A thick portion 7Fa is formed at the center of each pressing portion 7F, and a part of the engaging member 5 is sandwiched between the thick portion 7Fa and the cylindrical inner surface 9A of the outer ring member 9 with an appropriate pressing force. ing.

  In a neutral state where no external force is applied to the input member 1 and the output member 3, the thick portion 7Fa of each pressing portion 7F is in a position corresponding to the approximate center of the distal end surface 3C1 of each output engagement piece 3C of the output member 3. When the engagement member 5 is not assembled, the gap between the thick portion 7Fa of each pressing portion 7F and the cylindrical inner surface 9A of the outer ring member 9 is somewhat smaller than the diameter of the engagement member 5 such as a roller. Thus, the thick portion 7Fa of each pressing portion 7F is at least slightly closer to the outer ring member 9 side than the substantially center of the front end surface 3C1 of each output engagement piece 3C.

  In the state in which the engaging member 5 is assembled as shown in FIG. 6, the pressing portion 7F is naturally pushed by the engaging member 5 toward the center of the outer ring member and is somewhat bent, so the thick portion of the pressing portion 7F. 7Fa presses the engaging member 5 against the cylindrical inner surface 9A of the outer ring member 9 by the elastic force of the pressing portion 7F. Therefore, a small frictional force is generated between the engagement member 5 and the cylindrical inner surface 9A of the outer ring member 9, and the engagement member 5 is somewhat difficult to move by the action of the small braking force by this frictional force. If you don't work, you can't move.

  As described above, when an unillustrated load reaches the set upper set position, the input that has worked on the input member 1 at least once becomes zero. At this time, as shown in FIG. 4, reverse input in the direction of arrow Y corresponding to the downward direction is applied to the output member 3 due to a load (not shown). When the load is in the set upper set position, when the load is moved in the direction of the arrow Y by the reverse input acting on the output member 3, each pressing member 7F of the braking member 7 is pressed against the cylindrical inner surface 9A of the outer ring member 9. Since the engaging member 5 is difficult to move, the engaging member 5 bites in between the respective output engaging pieces 3C and the outer ring member 9 in a short time and exhibits a locked state. Note that the locked state is not released unless an input is applied to the input member 1 to push the output member 3 and the engagement member 5, and the reverse input applied to the output member 3 is not transmitted to the input member 1. Also in the third embodiment, the braking force of the braking member 7 is about a value at which the engaging member 5 does not move unless an external force in the rotational direction is applied to the engaging member 5 or larger. Since the action and effect of the braking force by the braking member 7 are substantially the same as those in the first and second embodiments, they will not be described further.

[Embodiment 4]
An example of the reverse input cutoff clutch according to the fourth embodiment will be described with reference to FIG. The fourth embodiment has substantially the same configuration as that of the third embodiment. Compared with the third embodiment, the pressing portion 7F of the braking member 7 that presses a part of the engaging member 5 against the cylindrical inner surface 9A of the outer ring member 9 is pressed. The difference is that the pressure was increased. The braking member 7 is made of a highly elastic metal material or synthetic resin material, and the pressing portions 7F and the node portions 7G are alternately positioned. When no external force is applied, the pressing portion 7F and the node portion 7G are pentagonal annular ones. As shown in FIG. 7, by pressing each engaging member 5 between the cylindrical inner surface 9A of the outer ring member 9 and the pressing part 7F having rich elasticity, the pressing part 7F is pushed in the center direction of the outer ring member. Then, it is curved and the engagement member 5 is pressed against the cylindrical inner surface 9A of the outer ring member 9 with a desired pressing force, thereby generating a frictional force. This frictional force becomes the braking force of the engaging member 5, and the braking force is larger than those in the first to third embodiments.

  The braking force of the braking member 7 will be described with reference to FIG. As described above, when an unillustrated load reaches the set upper set position, the input that has worked on the input member 1 at least once becomes zero. At this time, as shown in FIG. 4, reverse input in the direction of arrow Y corresponding to the downward direction is applied to the output member 3 due to a load (not shown). When the load is at the set upper set position, each engaging member 5 pressed against the cylindrical inner surface 9A of the outer ring member 9 by the pressing portion 7F due to reverse input acting on the output member 3 is not easily moved, so each is immediately The output engagement piece 3C and the outer ring member 9 are bitten at the same time to exhibit a locked state. In this state, unless the input member 1 is pressed to push the output member 3 and the engaging member 5, the locked state is not released, and the reverse input acting on the output member 3 is transmitted to the input member 1. Not.

  In this locked state, when an input in the same direction as the reverse input applied to the output member 3 is applied to the input member 1, the input engagement piece 1C pushes the engagement member 5 and the output engagement piece 3C. The state is released. However, as described above, a frictional force is generated between each engaging member 5 and the cylindrical inner surface 9A of the outer ring member 9, that is, the braking member 7 applies a braking force to each engaging member 5. The combined member 5 makes it difficult for the output member 3 to move in the rotational direction corresponding to the downward direction due to reverse input.

Next, a case where the direction in which the output member 3 rotates by the reverse input due to the load of the load coupled to the output member 3 and the direction of the input acting on the input member 1 are the same direction (for example, the direction of the arrow Y) Explained. When the braking force of the braking member 7 is equal to or greater than the reverse input acting on the output member 3, the braking member 7 and the engaging member 5 are reverse input unless the input member 1 pushes the output member 3 in the direction of arrow Y. Does not move in the direction of arrow Y. However, a large input is required during the operation of transmitting the input acting on the input member 1 to the output member 3. When the braking force of the braking member 7 is smaller than the reverse input acting on the output member 3, the input member 1 bites between the output member 3 and the outer ring member 9 without pressing the output member 3 in the direction of arrow Y. braking members 7 and the engaging member 5 in the lock until in some but works in a minute in the direction of arrow Y by the inverse input.

  For example, if the braking force of the braking member 7 is about the first to third embodiments or smaller than that, the engaging member 5 can move to the same degree or easier than the first to third embodiments. When the output member 3 moves due to the reverse input, the engagement member 5 also moves in the direction of the arrow Y although it is minute due to the frictional force acting between the output member 3 and the like. However, since a small braking force is applied to the engaging member 5 at this time, when the output member 3 is moved to some extent, the engaging member 5 is connected to the tip end surface 3C1 of the output engaging piece 3C and the cylindrical inner surface of the outer ring member 9. Gently lock with 9A. In this locked state, the first input engaging piece 1C catches up and pushes the engaging member 5 and the output engaging piece 3C, so that the locked state is released. By repeating these operations, the output engagement piece 3C intermittently moves in the direction of the arrow Y, which may cause a problem that a load (not shown) coupled to the output member 3 moves intermittently downward. is there.

  As can be seen from the above, the braking force of the braking member 7 is such that the speed at which the braking member 7, the engaging member 5 and the output member 3 move in the direction of arrow Y due to reverse input is greater than the speed of the input member 1 in the direction of arrow Y If the input is in the same direction as the reverse input, the output member 3 and the engagement member 5 do not move faster than the input member 1 when the lock is released, and the output The member 3 and the engaging member 5 move to the lower set position in a state where they substantially contact the input member 1. Thus, since the output member 3, the engaging member 5 and the braking member 7 are pushed by the input member 1 and move together with the input member 1, a load (not shown) coupled to the output member 3 is intermittently moved downward. Can be solved, and the input member can be smoothly moved without interrupting the load regardless of which direction the input is applied to.

  Further, when a product incorporating the reverse input cutoff clutch according to the present invention is shipped from the factory, the load (not shown) coupled to the output member 3 is disposed at the upper limit position where it does not move further upward. Even if a vertical force is applied to a load (not shown) due to vibration in the inside, the load does not shift. That is, the output member 3 to which the load is coupled cannot move mechanically in the rotational direction corresponding to the upward direction from the upper limit position, and this reverse input cutoff clutch in the opposite rotational direction corresponding to the downward direction from the upper limit position. Will immediately lock, so the load will not move in either direction up or down. Therefore, it is possible to solve the problem of having to readjust the load position at the delivery destination.

  Therefore, according to the fourth embodiment, as in the first to third embodiments, almost all the engaging members 5 that are immediately subjected to the braking force when the reverse input is applied to the output member 3 are connected to the output member 3 and the outer ring. Since it bites into the member 9 at the same time and exhibits a locked state, when the reverse input acts on the output member, it immediately becomes locked and only a part of the locking members do not wear. Even when the load coupled to the output member is driven downward, the braking force of the braking member 7 causes the output member 3 and the engaging member 5 to abut against the input member 1 and move together. There is also an effect that it can be driven smoothly without intermittent operation.

[Embodiment 5]
The fifth embodiment is different from the first to fourth embodiments in that the braking member 7 is coupled to the input member 1 via the elastic coupling member 8 as shown in FIG. The braking member 7 does not need to generate a frictional force with the cylindrical inner surface 9A of the outer ring member 9 as in the first and second embodiments, and the engaging member 5 is not used as the outer ring member 9 as in the third and fourth embodiments. It is not necessary to generate a frictional force between the engaging member 5 and the cylindrical inner surface 9A of the outer ring member 9 by pressing against the cylindrical inner surface 9A. That is, there is an effect that the loss (torcross) due to the frictional force by the braking member 7 can be eliminated during the operation of transmitting the input from the input member 1 to the output member 3. However, if necessary, the above-described frictional force of the braking member 7 may be used in combination.

  An example of the reverse input cutoff clutch according to the fifth embodiment will be described with reference to FIG. Since the output member 3 located at the center is the same as that of the first to fourth embodiments, the description thereof is omitted. The input member 1 has an input engagement piece composed of a first input engagement piece 1C that pushes the engagement member 5 in the rotation direction and a second input engagement piece 1D that pushes the output engagement piece 3C in the rotation direction. . The second input engagement piece 1D protrudes in front of the first input engagement piece 1C (front side in the axial direction) in FIG. 7, and is between the adjacent output engagement pieces 3C and 3C. Located in. In the fourth embodiment, an example in which the number of input engagement pieces is five is shown, but if it is three or more, it operates stably.

  Although only the braking piece 7D is shown as the braking member 7, various types such as a single-structure braking member 7 as shown in FIG. 2 in which the spring portion 7C is omitted can be considered. Each brake piece 7D is coupled to the second input engagement piece 1D by an elastic coupling member 8 such as a leaf spring or a spring spring. The elastic coupling member 8 relaxes or blocks the reverse input transmitted to the input member 1 via the engaging member 5 when the output member 3 is displaced by a reverse input. Since the elastic coupling member 8 may perform at least such a function, one or more braking pieces 7D may be coupled to one or more second input engagement pieces 1D, or the braking member may be made of an elastic material. And a structure in which a part of the braking member functions as the elastic coupling member 8 may be used. In this case, a part of the braking member coupled to the input member 1 is referred to as an elastic coupling member 8.

  When an input is applied to the input member 1 in either direction, the braking member 7 rotates together with the output member 3 and the engaging member 5 together with the input member 1, and the braking member 7 performs the holding action of the engaging member 5. Work as a retainer to do. Here, in a state in which the reverse input cutoff clutch is incorporated in a device, generally, a drive shaft such as a drive motor (not shown) is coupled to the input member 1, and the input member 1 is reversely input from the output member 3. A substantial force is required to rotate the shaft. When no input acts on the input member 1 and a reverse input in either direction acts on the output member 3, each output engagement piece 3C of the output member 3 is displaced, and at this time, the force in the displacement direction is applied to the engagement member. Take 5.

  The force applied to the engaging member 5 is transmitted to the braking member 7, and the force transmitted to the braking member 7 is absorbed by the elastic force of the elastic coupling member 8 and is not substantially transmitted to the stationary input member 1. The engaging member 5 bites between the output engaging piece 3C and the cylindrical inner surface 9A of the outer ring member 9 to be locked. That is, since the braking member 7 is locked to the stationary input member 1 via the elastic coupling member 8, the braking member 7 is engaged with the engaging member 5 when the output engaging piece 3 </ b> C starts to move. Since the braking force is applied and the elastic coupling member 8 absorbs the force transmitted to the braking member 7, the reverse input applied to the output member 3 is not substantially transmitted to the input member 1, and the engaging member 5 The output engagement piece 3 </ b> C and the cylindrical inner surface 9 </ b> A of the outer ring member 9 are bitten in a short time to exhibit a locked state.

  When an input in the same direction as the reverse input direction is applied to the input member 1 in this locked state, the locked state is released as described above, but the engaging member 5 is braked by the braking member 7 and thus input. It does not move at a greater speed than the member 1 but moves with the input member 1. In addition, since it is natural that only the output member 3 cannot move at a speed greater than that of the engaging member 5, even if the input acting on the input member 1 and the reverse input acting on the output member 3 are in the same direction, The output member 3, the engaging member 5, and the braking member 7 move in the rotational direction together with the input member 1. As a result, as described above, the problem that the load (not shown) coupled to the output member 3 intermittently moves downward can be solved, and the load is intermittently applied regardless of the direction of the input acting on the input member. It can move smoothly without doing.

  Furthermore, in the fifth embodiment, during the operation of transmitting the input acting on the input member 1 to the output member 3, unlike the first to fourth embodiments, the braking member 7 is controlled by the frictional force with the outer ring member. The main difference is that no power is generated. Therefore, during the operation of transmitting the input from the input member 1 to the output member 3, the loss due to the frictional force (torque) by the braking member 7 can be eliminated, so that it is not necessary to increase the input. Generation of heat and noise due to frictional force or wear of the braking member and the engaging member can be reduced. Moreover, the reverse input cutoff clutch of the fifth embodiment has the same effects as those of the first to fourth embodiments. Even in the reverse input cutoff clutches of the first to third embodiments, the speed at which the braking member 7 and the engaging member 5 move in the direction of the arrow Y due to the reverse input of the braking force of the braking member 7 is the arrow Y of the input member 1. If the spring force is increased to a value that can be made smaller than the speed in the direction, the same effect as in the fourth embodiment can be obtained.

DESCRIPTION OF SYMBOLS 1 ... Input member 1A ... Center hole 1B ... Input engagement part 1C ... 1st input engagement piece (input engagement piece)
1D: second input engagement piece 3: output member 3A: output shaft portion 3B: output engagement portion 3C: output engagement piece 3C1: output engagement piece 3C Front end surface 5 ... engaging member 7 ... braking member 7A ... body part 7A1 ... hole formed in the body part 7B ... collar part 7C ... spring part 7C1 ... coupling part 7C2 ... Projection 7C3 ... First part 7C4 ... Second part 7C5 ... Third part 7D ... Braking piece 7E ... Locking part 7E1 ... Anti-rotation part 7F: Pressing part 7Fa: Thick part of the pressing part 7F 7G ... Node 8 ... Elastic engagement member 9 ... Outer ring member 9A ... Cylindrical inner surface 9B ... Cylindrical Outer surface 9B1 ... Locking portion 9C ... Annular end wall 9C1 ... Through hole 11 ... Shield member 11A ... Insertion hole

Claims (3)

An input member having an input engagement piece extending outward at a constant interval; an output member comprising an output engagement piece capable of entering and engaging with the input engagement piece ; a cylindrical inner surface and a cylindrical outer surface; located between the outer ring member, and the cylindrical inner surface of the outer ring member and the distal end surface of the output engagement piece a between the input engagement piece and said input engaging pieces adjacent to each other with a 1 And the input member acting on the input member is transmitted to the output member when the input engagement piece pushes the output engagement piece and the engagement member, and reversely acting on the output member. In the reverse input cutoff clutch, the input is not transmitted to the input member by locking the engagement member between the front end surface of the output engagement piece and the cylindrical inner surface of the outer ring member.
A braking member that applies a braking force to the engaging member for braking the movement of the engaging member in any direction along the cylindrical inner wall surface of the outer ring member;
Said braking member, which comprises a braking member for braking and holding the engagement member and a spring portion for causing the braking force to the cylindrical inner surface by direct pressing to frictionally force the frictional force of the outer ring member The reverse input cutoff clutch, wherein an input acting on the input member and a reverse input acting on the output member are transmitted to the braking member via the engaging member. Oite to claim 1,
The reverse input cutoff clutch according to claim 1, wherein the braking force acting on the engagement member is of a magnitude such that the engagement member does not move when an external force does not act on the engagement member. In claim 1 or claim 2 ,
The braking force acting on the engagement member is greater than a value for braking the engagement member so that the speed of movement of the output member is slower than the speed of movement of the input member due to the input due to the reverse input. A reverse input cutoff clutch characterized by that.

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