JP5262072B2 - Rotating locking device for vehicle seat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance border precision between the lock zone and the free zone and widen the respective zones of the lock zone and the free zone of a rotation stop device in a reclining device or others. <P>SOLUTION: Projecting planar faces 12b projecting more than inner teeth 12a formed in a cylinder portion 12 are integrally formed in a ratchet 10. The meshing between all engaging teeth 30... and the inner teeth 12a are blocked by the interference of specific engaging teeth 30 and the projecting planar faces 12b in the area where the projecting planar faces 12b are located in the destination of the specific engaging teeth 30 arranged in the shown upper side in the rotation area of the ratchet 10. A free zone plate 80 having an engaging face 81 blocking the meshing between the specific engaging teeth 30 and the inner teeth 12a by bringing the engaging bosses 30b formed in the specific engaging teeth 30 into contact the same are assembled in the ratchet 10. The engaging face 81 falls in an arranged condition capable of coming into contact with the engaging bosses 30b when the projecting planar faces 12b further comes into the area from the rotation position where the projecting planar faces 12b come into the destination area of the engaging teeth 30. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to a rotation stopping device for a vehicle seat. More specifically, the present invention relates to a vehicle seat rotation-retaining device that connects a base-side member and a movable-side member disposed so as to be rotatable relative to the base-side member.

  2. Description of the Related Art Conventionally, in a vehicle seat, a configuration including a reclining device that connects a seat back to a seat cushion so that a backrest angle can be adjusted is known. Here, Patent Document 1 below discloses an example of the internal structure of the reclining device. In this disclosure, the reclining device has a disc-shaped guide coupled to the skeleton portion of the seat cushion and a disc-shaped ratchet coupled to the skeleton portion of the seat back, and these rub against each other's disc shape. It has a structure that is assembled so that it is relatively rotatable.

  A pole having external teeth is disposed between the disks. The pole is supported so as to be movable only inward and outward in the radial direction with respect to the guide. The ratchet is formed with internal teeth that mesh with the external teeth of the pole when the pole is moved radially outward. Therefore, the relative rotation between the ratchet and the guide can be locked via the pole by engaging the pole and the ratchet with each other.

  Here, in the reclining device, a lock zone in which locking by engagement of a pole and a ratchet and a free zone in which locking cannot be performed are set in a tilting region of the seat back. In the above disclosure, this free zone is set by forming a protruding flat surface without teeth in a part of the formation region of the internal teeth of the ratchet. However, in this type using a protruding plane, if the number of poles installed on the guide increases, the area in which the pole can be rotated so as not to interfere with the protruding plane is narrowed, and the use of a seat back that can be used as a lock zone The area will be narrowed.

Therefore, for example, in Patent Document 2 below, a structure is employed in which locking is prevented by pressing a protrusion formed on the pole against a plate provided separately from the ratchet. In the type with this plate, even if the number of poles increases, by forming a protrusion that interferes with the plate on one of these poles, the other poles do not interfere with the plate, so the lock zone is widened. There is an advantage that it can be secured.
JP 2002-209660 A JP 2007-130237 A

  However, in the technique disclosed in Patent Document 2, the plate that interferes with the protrusion of the pole is formed of a separate part from the ratchet. Therefore, compared to the integrated structure shown in Patent Document 1, the lock zone and the free zone The boundary accuracy between and becomes worse. This may cause a so-called tooth skipping phenomenon in which the pole locks at a position that jumps over the first-stage lock position that enters the lock zone when the reclining device enters the lock zone from the free zone.

  The present invention was devised as a solution to the above-described problem, and the problem to be solved by the present invention is to improve the boundary accuracy between the lock zone and the free zone of a rotation retaining device such as a reclining device. It is to be able to be increased and to expand each area of the lock zone and the free zone.

In order to solve the above-mentioned problems, the vehicle seat rotation locking device of the present invention takes the following means.
A first aspect of the present invention is a vehicle seat rotation-retaining device that connects a base-side member and a movable-side member, which is rotatably arranged with respect to the base-side member, so that they can be rotationally retained. The vehicle seat rotation-retaining device includes two coupling members that are assembled to be rotatable relative to each other, an engagement tooth that is assembled to be movable in a radial direction with respect to one of the two coupling members, and an engagement tooth And a pressing cam that pushes one side in the radial direction by the movement of the biasing force. A plurality of engaging teeth are arranged in the circumferential direction on one side of the connecting member, and are engaged with the tooth surfaces formed on the other side of the connecting member by being pushed by the pressing cam, respectively. The relative rotation of the members is restricted. The other connecting member is integrally formed with a protruding flat surface that protrudes from the tooth surface. In the region where the projecting plane is located at the movement destination of the specific engaging tooth in the rotation region of the connecting member on the other side, all the engaging teeth and the tooth surface are caused by interference between the specific engaging tooth and the projecting plane. Is prevented from meshing. A locking member having a locking surface that prevents the engagement between the specific engagement tooth and the tooth surface by bringing an engagement protrusion formed on the specific engagement tooth into contact with the connecting member on the other side is integrally formed. It is assembled to. The locking surface can come into contact with the engaging protrusion when the projecting plane is changed from the first rotational position where the specific engaging tooth is moved into the second rotational position into the region. It will be in the arrangement state.

  According to this first invention, either the specific engaging tooth interferes with the projecting plane formed on the other connecting member, or the engaging projection abuts on the locking surface of the locking member. Therefore, the engagement with the tooth surface is hindered. This specific engagement tooth is first rotated by a relative rotation of the other side connecting member, so that the projecting plane is in a first rotational position where the engagement tooth enters the destination area from the outside of the destination area. It will be in the state which interferes with this protrusion plane. Then, the specific engagement tooth moves from the first rotation position to the second rotation position where the engagement tooth moves into the second rotation position by further relative rotation of the other side connecting member. As a result, the engaging projection comes into contact with the locking surface of the locking member. Therefore, the boundary accuracy between the lock zone in which a specific engagement tooth can be engaged with the tooth surface and the free zone in which the engagement is impossible is the dimension due to the integral formation of the protruding plane formed on the other connecting member. It will be increased by the accuracy. In addition, after a specific engagement tooth enters the free zone, the area of the free zone is secured by a locking surface that does not come into contact with an engagement tooth other than the specific engagement tooth. . Therefore, since the width dimension in the circumferential direction necessary for the projecting plane can be set narrow, the lock zone can also be set wide.

Next, according to a second aspect of the present invention, in the first aspect described above, the projecting plane has a specific engagement tooth at least in a rotation region before entering the arrangement region where the locking surface can come into contact with the engagement protrusion. It is formed to have a width that is narrow in the circumferential direction to such an extent that the interference can be achieved.
According to the second aspect of the present invention, since the circumferential width of the protruding plane is narrow, the rotation area until the protruding plane interferes with another engaging tooth adjacent to the specific engaging tooth. Can be secured widely. Therefore, the lock zone can be set wider.

Next, according to a third aspect, in the first or second aspect described above, the base side member is configured as a fixed body such as a seat cushion of a vehicle seat or a floor. The movable side member is configured as a seat back of a vehicle seat. The rotation region of the movable side member in which the engaging teeth can mesh with the tooth surface is set as a tilting region where the seat back is used by the seated person. The rotation region in which the engagement teeth cannot mesh with the tooth surface is set as a tilt region where the seat back is tilted toward the fixed body beyond the tilt region where the seat back is used.
According to the third aspect of the invention, the tilting area where the seat back is seated and used is set as the lock zone, and the tilting area where the seat back is tilted is set as the free zone, so that the backrest angle of the seat back can be set. The adjustment area and the fall-in area where the seat back is pushed down can be set widely. In addition, since the boundary accuracy between the lock zone and the free zone has been increased, when the seat back is raised, the initial locking position where the engagement teeth enter the lock zone from the free zone by the spring is raised. It is possible to prevent the so-called tooth skipping phenomenon that meshes at the jumped position.

  Embodiments of the best mode for carrying out the present invention will be described below with reference to the drawings. In the following embodiments, the vehicle seat rotation locking device according to the present invention is employed as a reclining device arranged for adjusting the backrest angle of the vehicle seat.

  First, the configuration of the reclining device 4 according to the first embodiment will be described with reference to FIGS. Here, in FIG. 2, a schematic configuration of the vehicle seat 1 of the present embodiment is shown in a perspective view. In the vehicle seat 1, a seat back 2 that serves as a backrest is coupled to a seat cushion 3 that serves as a seating portion by a pair of left and right reclining devices 4 and 4 disposed at lower positions on both sides. These reclining devices 4 and 4 are configured such that their operation shafts 4c and 4c are integrally connected by a connecting rod 4r.

  Thereby, each reclining device 4 and 4 synchronizes with the locked state which fixed the backrest angle of the seat back 2, and the cancellation | release state which cancels | releases this fixed state and enables the backrest angle adjustment of the seat back 2. Then, the switching operation is made. Here, each reclining device 4 and 4 is always kept in the operation state locked by urging. However, the reclining devices 4 and 4 are unlocked simultaneously by pulling up the operation lever 5 provided at the side position of the seat cushion 3. Thereby, the fixed state of the backrest angle of the seat back 2 is released, and the backrest angle can be adjusted and moved.

  Then, after adjusting the backrest angle of the seat back 2, if the release operation of the operation lever 5 is stopped, the reclining devices 4 and 4 are again returned to the locked state by the urging, so the seat back 2 is adjusted. It is fixed at the backrest angle position. Here, the seat back 2 is normally urged in the forward rotation direction by an urging force of an urging spring (not shown) hooked between the seat back 2 and the seat cushion 3.

  Therefore, the seat back 2 is pushed forward toward the upper surface portion of the seat cushion 3 by urging by releasing the locked state of the reclining devices 4 and 4 while the vehicle seat 1 is not seated. . At this time, the reclining devices 4 and 4 are returned to the locked state by urging by stopping the release operation of the operation lever 5 during normal use of the backrest.

  However, each reclining device 4, 4 is set with a lock zone L that is returned to the locked state by urging when the release operation described above is stopped, and a free zone F that is not returned to the locked state even if the release operation is stopped. (See FIG. 10). The former lock zone L is normally tilted to the rear side from the angular position where the vehicle seat 1 (see FIG. 2) is seated and used, specifically, the angular position where the seat back 2 is in an upright posture. It is set in the area between the angular positions. The latter free zone F is an angular region where the occupant is not seated and used, specifically between an angular position where the seat back 2 is in an upright posture and an angular position where the seatback 2 is pushed forward. It is set in the area.

  Therefore, when the seat back 2 is moved forward, the reclining devices 4 and 4 are unlocked, and if the seat back 2 is tilted slightly from the upright position, the release operation is stopped. The back 2 is naturally pushed down toward the upper surface of the seat cushion 3. Hereinafter, the configuration of the reclining devices 4 and 4 will be described in detail. The reclining devices 4 and 4 have a symmetrical configuration with each other, but have substantially the same configuration. Therefore, below, only the configuration of the reclining device 4 shown on the right side in FIG.

  As shown in FIG. 1, the reclining device 4 includes a disk-shaped ratchet 10 and a guide 20, three poles 30, and a rotating cam 40 that are disposed between the two disks. A hinge cam 50 for rotating the rotary cam 40, a biasing spring 60 for rotating and biasing the hinge cam 50, and the ratchet 10 and the guide 20 are held in a state of being sandwiched in the plate thickness direction (axial direction). The outer peripheral ring 70 and the plate 80 for creating the above-described free zone F (see FIG. 10) in the reclining device 4 are assembled into one.

  Here, the guide 20 corresponds to the connecting member on one side of the present invention, the ratchet 10 corresponds to the connecting member on the other side of the present invention, the poles 30... Correspond to the engaging teeth of the present invention, and the rotating cam. 40 corresponds to the pressing cam of the present invention, and the free zone plate 80 corresponds to the locking member of the present invention.

  Hereinafter, the configuration of each component will be described in detail. First, the configuration of the ratchet 10 will be described. The ratchet 10 is formed with a cylindrical portion 12 projecting in a cylindrical shape in the thickness direction at the outer peripheral edge of the disk portion 11. The cylindrical portion 12 is formed by half-cutting the outer peripheral edge of the disc portion 11 in the plate thickness direction. And the internal tooth 12a and the protrusion plane 12b are formed in the internal peripheral surface of this cylindrical part 12. As shown in FIG. Here, the protruding flat surface 12b is a flat surface (curved surface having no teeth) at a position protruding inward in the radial direction from the internal teeth 12a at one place on the inner peripheral surface of the cylindrical portion 12 in the circumferential direction. It is formed.

  And the rotation area | region in which this internal tooth 12a was formed becomes a rotation area | region which can mesh | engage the pawl 30 ... mentioned later with the ratchet 10 as FIG. 6 shows. As shown in FIG. 8, the rotation region in which the projecting flat surface 12 b is formed is a rotation region in which the engagement of the poles 30 ··· with the ratchet 10 can be prohibited. As shown in FIG. 3, the ratchet 10 is integrally connected to the seat back 2 by joining the outer surface of the disk portion 11 to the plate surface of the back frame 2 f forming the skeleton of the seat back 2. Has been.

  Here, the disc portion 11 of the ratchet 10 is formed with a plurality of dowels 13a... And D dowels 13b that protrude in a cylindrical shape from the outer plate surface. These dowels 13a,... And D dowels 13b are arranged and formed at equal intervals in the circumferential direction at a position closer to the outer peripheral edge of the disk portion 11. Among them, the D dowel 13b is formed by cutting out a part of the protruding cylindrical shape into a D-shaped cross section, and the shape is distinguished from the dowel 13a protruding in the cylindrical shape. ing.

  On the other hand, the dowel holes 2a,... And the D dowel holes 2b into which the above-described dowels 13a,. Therefore, the ratchet 10 is attached to the back frame 2f by fitting these dowels 13a... And D dowels 13b into the dowel holes 2a .. and D dowel holes 2b formed in the back frame 2f, respectively. It is firmly and integrally connected (see FIG. 5).

  At the center of the disk portion 11 of the ratchet 10, a through hole 14 is formed through which an operation shaft 4c (see FIG. 2) for performing the unlocking switching operation of the reclining device 4 is inserted. The back frame 2f is also provided with a through hole 2c at the same coaxial line as the through hole 14 for the same purpose.

  Next, returning to FIG. 1, the configuration of the guide 20 will be described. The guide 20 is formed in a disk shape having an outer diameter slightly larger than that of the ratchet 10. A cylindrical portion 22 is formed on the outer peripheral edge of the disk portion 21 of the guide 20 so as to project in a cylindrical shape in the thickness direction toward the ratchet 10. The cylindrical portion 22 is formed by half-cutting the outer peripheral edge of the disc portion 21 in the plate thickness direction. As shown in FIG. 5, the cylindrical portion 22 is formed in a size that allows the cylindrical portion 12 of the ratchet 10 to be assembled inside the cylinder.

  In a state where the cylindrical portion 12 of the ratchet 10 is assembled inside the cylinder of the cylindrical portion 22, the guide 20 and the ratchet 10 are rotated relative to each other as if the cylindrical shapes are fitted to each other. It will be in a state that can be. As shown in FIG. 4, the guide 20 is integrally connected to the seat cushion 3 by joining the outer surface of the disk portion 21 to the plate surface of the cushion frame 3 f that forms the skeleton of the seat cushion 3. Has been.

  Here, the disc portion 21 of the guide 20 is formed with a plurality of dowels 24a... Protruding in a cylindrical shape from the outer disc surface. These dowels 24a are arranged and formed at equal intervals in the circumferential direction at a position closer to the outer peripheral edge of the disk portion 21. On the other hand, dowel holes 3a, through which the above-described dowels 24a, .. can be fitted are formed through the cushion frame 3f. Therefore, the guides 20 are firmly and integrally connected to the cushion frame 3f by fitting these dowels 24a... Into the dowel holes 3a formed in the cushion frame 3f and welding them (FIG. 5).

  At the center of the disk portion 21 of the guide 20, a through hole 25 is formed through which the operation shaft 4 c (see FIG. 2) for performing the unlocking switching operation of the reclining device 4 is inserted. And the through-hole 3c is formed also in the cushion frame 3f at the position on the same axis as the through-hole 25 for the same purpose. The through hole 3c is formed in a large shape so that an urging spring 60 described later can be accommodated in the hole.

  Returning to FIG. 1, a guide groove 23 is formed in the disk portion 21 of the guide 20, the inner plate surface of which is partially recessed in the plate thickness direction. The guide groove 23 is formed by half-cutting the disk portion 21 in the plate thickness direction. Here, the above-mentioned dowels 24a,... Are formed so as to protrude at positions on the outer board surface where the guide grooves 23 are formed. The guide groove 23 includes a pole groove 23 a formed at three locations in the circumferential direction of the disk portion 21 and a rotating cam groove 23 b formed at the center portion of the disk portion 21.

  Each of the former pole grooves 23a,... Is formed in a shape extending radially outward from the rotating cam groove 23b, and each of the poles 30,. . As shown in FIGS. 6 to 7, these pole grooves 23a,... Are formed according to the shape of the guide walls 21a-21c formed as side walls on both sides in the circumferential direction. The guide is guided so as to slide only inward and outward in the radial direction of the guide 20 along the groove shape. The latter rotating cam groove 23b is formed in a shape capable of accommodating the rotating cam 40 therein.

  Returning to FIG. 1, the disk portion 21 of the guide 20 is formed with spring hook portions 26, 26 protruding in a pin shape from the outer plate surface. These spring hooks 26 and 26 are adapted to hook an outer end 62 of an urging spring 60 (winding spring), which will be described later, and can be selected at two positions in the circumferential direction so that the hooking position can be selected. Protrusions are formed.

  Next, the configuration of the poles 30 will be described. These poles 30 are formed in the shape of a piece accommodated in the pole grooves 23a formed in the guide 20 described above. These poles 30 are formed in an arcuate shape whose outer peripheral edge matches the shape of the inner peripheral surface of the cylindrical portion 12 of the ratchet 10 described above. Further, outer teeth 30a... That can mesh with the inner teeth 12a formed on the cylindrical portion 12 of the ratchet 10 are formed on the outer circumferential surface curved in an arc shape.

  Accordingly, as shown in FIG. 6, each pole 30... Is pressed by a rotating cam 40, which will be described later, and slides outward in the radial direction so that each external tooth 30 a. Engage with 12a. Thereby, each pole 30 ... and the ratchet 10 will be in an integrated state in the circumferential direction by mutual meshing. However, each pole 30... Can slide only inward and outward in the radial direction in relation to the guide 20.

  Therefore, the ratchet 10 is in a state in which the relative rotation with respect to the guide 20 is restricted via the pawls 30. Thereby, the reclining apparatus 4 will be in the locked state. As shown in FIG. 7, the reclining device 4 is unlocked by pulling the poles 30... Inward in the radial direction and releasing them from meshing with the ratchet 10.

  Here, the operation of sliding the respective poles 30... Inward and outward in the radial direction is performed by a rotating operation of the rotating cam 40 disposed at the center of the guide 20. As shown in FIG. 1, the rotary cam 40 is formed in a frame shape that is accommodated in the rotary cam groove 23 b formed in the guide 20 described above. This rotating cam 40 has shoulders 42... That can push the poles 30... Radially outward at three locations in the circumferential direction of the outer peripheral edge thereof, and the poles 30. Hooks 44 are formed which can be pulled inward in the direction.

  Here, the above-described poles 30 are formed in a portal shape in which the shape on the radially inner side is partially hollowed out. Each pole 30... Is brought into a radially outward side by the rotational movement of the rotating cam 40 by bringing the gate-shaped leg portion 32. A pressing operation is performed. Specifically, as shown in FIG. 6, each pole 30... Is pressed by each leg 32... Against each shoulder 42. And is operated so as to be pushed outward in the radial direction.

  Thereby, each pole 30... Is held in a state in which each external tooth 30 a is meshed with the internal tooth 12 a of the ratchet 10. As shown in FIG. 7, each pole 30... Has a hook 31... Formed on the inner side of the portal shape by the rotation of the rotating cam 40 counterclockwise as shown in FIG. Are hooked on the respective hooks 44, and pulled inward in the radial direction. As a result, the respective poles 30 are removed from meshing with the ratchet 10 while the leg portions 32 are pulled into the respective grooves 43 formed on the outer peripheral edge of the rotary cam 40.

  The operation of rotating the rotating cam 40 is performed by rotating the hinge cam 50 assembled in the cam hole 41 at the center. As can be seen with reference to FIG. 1, the hinge cam 50 is integrally assembled in the rotational direction with the rotating cam 40 by being fitted into the cam hole 41. The hinge cam 50 is normally urged to rotate in the clockwise direction shown in FIG. 1 by the urging force of an urging spring 60 (winding spring) hooked between the hinge cam 50 and the guide 20. Here, as shown in FIG. 4, the urging spring 60 has an inner end 61 hooked to the spring hooking portion 51 of the hinge cam 50 and an outer end 62 hooked to the spring hooking portion 26 of the guide 20. Has been.

  Thereby, as shown in FIG. 6, the hinge cam 50 is rotated in the clockwise direction shown in the drawing by pressing the rotating cam 40 from the inner surface side of the cam hole 41 by the operation protrusion 52 formed so as to protrude from the outer periphery at all times. It is supposed to let you. As a result, the poles 30 are held in a locked state in which the pawls 30 are engaged with the ratchet 10 as the legs 32 are put on the shoulders 42 of the rotating cam 40.

  The hinge cam 50 is integrally connected to the operation shaft 4c described above with reference to FIG. Thereby, the hinge cam 50 is rotated counterclockwise in the figure against the urging of the urging spring 60 shown in FIG. 1 as the operation lever 5 (see FIG. 2) is pulled up. That is, the hinge cam 50 is rotated counterclockwise in FIG. 6 by the above-described operation. As a result, as shown in FIG. 7, the rotating cam 40 is pushed in the same direction, and the pawls 30 are disengaged from the meshed state with the ratchet 10.

  Next, returning to FIG. 1, the outer peripheral ring 70 will be described. The outer peripheral ring 70 is formed in a bottomed cylindrical shape by bending a thin hollow disk-like member in the thickness direction (axial direction) of the outer peripheral edge. Thereby, the end surface part of the outer peripheral ring 70 on the right side in the figure is formed as a holding part 71 having a surface in the axial direction. The holding portion 71 is formed with protrusions 71a... Partially protruding from the inner plate surface at a plurality of locations in the circumferential direction.

  And the ratchet 10 and the guide 20 mentioned above are assembled | attached to the cylindrical inside to the cylindrical part 72 which protruded cylindrically in the plate | board thickness direction (axial direction) from the outer periphery of this holding | maintenance part 71 (FIG. 5). Here, the inner diameter of the cylindrical portion 72 is set to be approximately the same as the outer diameter of the cylindrical portion 22 of the guide 20. Thereby, the outer periphery ring 70 is assembled | attached to the guide 20 in the state which does not produce rattling in radial direction as the state which enclosed the guide 20 assembled | attached inside the cylinder of the cylindrical part 72 from the outer peripheral side.

  The ratchet 10 and the guide 20 described above are inserted into the cylinder of the cylindrical portion 72 in the arrangement order shown in FIG. As a result, as shown in FIG. 5, the ratchet 10 previously inserted into the cylinder has a position where the outer plate surface of the cylindrical portion 12 hits the protrusion 71 a formed on the holding portion 71 of the outer ring 70. Is inserted into the cylinder. Then, with the guide 20 inserted through the cylinder of the outer ring 70, the end surface portion (caulking portion 73) of the outer ring 70 is bent and fixed inward in the radial direction, thereby fixing the ratchet 10 and the guide 20. Is held in a state of being sandwiched in the thickness direction by the outer peripheral ring 70. The caulking portion 73 is formed to be bent so that a slight gap is generated so as not to inhibit the relative rotation of the ratchet 10 with respect to the guide 20.

  Next, returning to FIG. 1, the free zone plate 80 will be described. The free zone plate 80 is formed of a thin hollow disk-like member, and is assembled in a state of being superimposed on the inner surface of the disk portion 21 of the ratchet 10. Specifically, in the free zone plate 80, the fitting holes 82 penetratingly formed at two locations on the plate are respectively fitted into the fitting pins 15 that are projected and formed at two locations on the disk portion 21 of the ratchet 10. It is integrally assembled with the ratchet 10 in the rotational direction.

  The free zone plate 80 is formed with a locking surface 81 whose inner peripheral surface partially protrudes radially inward at one place in the circumferential direction. The locking surface 81 is formed only in the pole 30 (hereinafter, referred to as a specific pole 30) arranged on the upper side in the figure among the poles 30 shown in FIG. It is formed as an interference surface that interferes with the engaging protrusion 30b protruding to the surface. Specifically, as shown in FIG. 9, the locking surface 81 is disposed at a position on the radially outer side where the relative rotation position of the ratchet 10 with respect to the guide 20 becomes the movement destination of the engagement protrusion 30 b. When it is done, it comes into contact with the engaging protrusion 30b.

  The locking surface 81 is in contact with the engaging protrusion 30b, thereby restricting the movement of the specific pole 30 having the engaging protrusion 30b and restricting the rotation of the rotating cam 40 in the clockwise direction in the figure. Thereby, since the other two poles 30 and 30 are not pushed out by the rotating cam 40, the reclining device 4 is not locked.

  Here, as shown in FIG. 6, the free zone plate 80 has a protruding plane 12 b formed on the ratchet 10 in a rotation region between the specific pole 30 and the pole 30 adjacent to the lower left side in the drawing. In the arranged state, the engaging surface 81 is arranged so as not to interfere with the engaging protrusion 30b. As a result, as shown in FIG. 10, the rotation region in which the projecting plane 12 b moves is set as a lock zone L in which each pole 30... Can mesh with the ratchet 10.

  Then, as shown in FIG. 8, when the ratchet 10 is rotated relative to the guide 20 from the state shown in FIG. 6 in the clockwise direction in the drawing, the protruding plane 12b is arranged at the position where the specific pole 30 is moved. Become. Thereby, even if the specific pole 30 is pushed and moved radially outward by the rotating cam 40, the engagement with the internal teeth 12a is hindered by the interference with the projecting plane 12b, so that the reclining device 4 is locked. It becomes impossible.

  Then, as shown in FIG. 9, when the ratchet 10 is further rotated relative to the guide 20 in the clockwise direction from the state of FIG. 8, the locking surface 81 formed on the above-described free zone plate 80 is It will be in the arrangement | positioning state located in the movement destination of the engagement protrusion 30b of the specific pole 30. FIG. Here, since the locking surface 81 is in a relationship that does not interfere with each other in relation to the poles 30 and 30 other than the specific pole 30, the circumferential length thereof can be freely set. However, the movement of the other poles 30, 30 is not affected. Therefore, by setting the circumferential length of the locking surface 81 to be long, as shown in FIG. 9, the projecting plane 12b rotates to a position beyond the area where the specific pole 30 is moved. In addition, the free zone F that can prevent the meshing between the pawls 30 and the ratchet 10 can be made longer (see FIG. 10).

  Here, as shown in FIG. 8, the engagement protrusion 30 b is configured to relatively rotate the ratchet 10 in the clockwise direction from the first rotation position where the specific pole 30 rides on the protruding plane 12 b. The protruding flat surface 12b rides on the locking surface 81 at a rotational position before the protruding plane 12b moves out of the movement destination area of the specific pole 30. As a result, the free zone F is continuously formed from the first rotation position at which the specific pole 30 rides on the engagement protrusion 30b to the rotation position at which the engagement protrusion 30b rides on the locking surface 81 without interruption. It has become so.

  Further, the engaging protrusion 30b can be applied to the end portion of the locking surface 81 by the rotational force even if the ratchet 10 is relatively rotated in the clockwise direction in the figure with the specific pole 30 riding on the protruding plane 12b. While being guided by the formed slope, it smoothly rides on the locking surface 81. Thus, in the free zone F, the relative rotation of the ratchet 10 with respect to the guide 20 can be continuously and smoothly performed.

  Thus, according to the reclining device 4 of the present embodiment, the specific pole 30 interferes with the projecting plane 12b formed on the ratchet 10, or the engaging projection 30b has the locking surface 81 of the free zone plate 80. Engagement with the ratchet 10 is prevented. The specific pole 30 is in a first rotational position state (state shown in FIG. 8) in which the protruding plane 12b enters the destination area from the outside of the destination area of the specific pole 30 by the relative rotation of the ratchet 10. Thus, first, the projecting plane 12b is brought into a state of mutual interference.

  The specific pole 30 is moved by the further relative rotation of the ratchet 10 so that the projecting plane 12b moves further from the first rotation position to the second rotation position where the specific pole 30 enters the movement destination area. Thus, the engagement protrusion 30b comes into contact with the locking surface 81 of the free zone plate 80 (the state shown in FIG. 9). Therefore, the boundary accuracy between the lock zone L in which the specific pole 30 can engage with the ratchet 10 and the free zone F in which the specific pawl 30 cannot engage is the dimensional accuracy due to the integral formation of the protruding flat surface 12b formed in the ratchet 10. Will be enhanced by.

  Further, after the specific pole 30 enters the free zone F, the area of the free zone F is secured by the locking surface 81 configured not to contact the poles 30 and 30 other than the specific pole 30. Will be. Therefore, since the circumferential width required for the projecting plane 12b can be set narrow, the lock zone L can also be set wide as shown in FIG.

  As mentioned above, although the embodiment of the present invention has been described using one example, the present invention can be implemented in various forms in addition to the above example. For example, in the above embodiment, the vehicle seat rotation locking device of the present invention is applied as a connecting device to a seat cushion of a tilting seat back. However, this rotation locking device can also be applied as a connecting device that connects the tiltable seat back to the vehicle body floor. Further, the present invention can also be applied as a connecting device for configuring the seat body to be rotationally moved in the turning direction with respect to the vehicle body floor. In addition, a so-called ottoman device that lifts and supports the lower leg of the seated person from the lower side can also be applied as a connecting device that is tiltably connected to the seat cushion or the vehicle body floor.

  Also, the pawls that are engaging teeth were engaged with the inner teeth of the ratchet by moving radially outward with respect to the guide, but they moved radially outward with rotational movement with respect to the guide. May be configured to mesh with the internal teeth of the ratchet. Moreover, the outer periphery ring should just be the structure which can pinch | interpose a ratchet and a guide in a plate | board thickness direction, and does not necessarily need to be formed in the ring shape.

  In addition, the pressing cam only needs to be configured to be able to press the pole outward in the radial direction. In addition to the rotating cam shown in the above embodiment, the pressing cam is configured to press the pole by a sliding motion in the radial direction. Can also be used.

1 is an exploded perspective view of a reclining device according to Embodiment 1. FIG. It is a perspective view showing the schematic structure of the vehicle seat. It is a perspective view showing the assembly state of the reclining device. It is a perspective view showing the assembly state of the reclining device. It is the VV sectional view taken on the line of FIG. It is the VI-VI sectional view taken on the line of FIG. 3 showing the locked state of the reclining apparatus. It is sectional drawing showing the state which cancelled | released the locked state of the reclining apparatus from the state of FIG. It is sectional drawing showing the state which the reclining apparatus entered into the free zone. It is sectional drawing showing the state which the reclining apparatus further entered into the free zone. It is a block diagram showing the lock zone and free zone of the reclining device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle seat 2 Seat back 2f Back frame 2a Dowel hole 2b D Dowel hole 2c Through hole 3 Seat cushion 3f Cushion frame 3a Dowel hole 3c Through hole 4 Reclining device (rotation retaining device)
4c Operation shaft 4r Connection rod 5 Operation lever 10 Ratchet (connection member on the other side)
DESCRIPTION OF SYMBOLS 11 Disk part 12 Cylindrical part 12a Internal tooth 12b Projection plane 13a Dowel 13b D dowel 14 Through-hole 15 Fitting pin 20 Guide (one side connection member)
21 disk part 21a-21c guide wall 22 cylindrical part 23 guide groove 23a pole groove 23b rotating cam groove 24a dowel 25 through hole 26 spring hook part 30 pole (engaging tooth)
30a External tooth 30b Engagement protrusion 31 Hanging part 32 Leg part 40 Rotating cam (pressing cam)
41 Cam hole 42 Shoulder portion 43 Groove portion 44 Hook 50 Hinge cam 51 Spring hook portion 52 Operation protrusion 60 Biasing spring 61 Inner end 62 Outer end 70 Outer peripheral ring 71 Holding portion 71a Protruding portion 72 Cylindrical portion 73 Caulking portion 80 Free zone plate (engagement) Stopping member)
81 Locking surface 82 Fitting hole F Free zone L Lock zone

Claims (1)

A vehicular seat rotation-retaining device that couples a vehicle seat back to a fixed state fixed on a floor such as a seat cushion in a rotatable manner,
Two connecting members assembled in the axial direction and capable of relative rotation;
A plurality of engagement teeth arranged in a circumferential direction supported and provided so as to be movable only inward and outward in the radial direction with respect to the one side connecting member;
By pressing each engaging tooth inward or outward in the radial direction by urging and pressing and engaging the tooth surface formed on the connecting member on the other side, the relative relationship between the two connecting members is increased. A pressing cam that locks the rotation, and
The other connecting member is integrally formed with a projecting plane that projects higher than the tooth surface, and the projecting plane is in the circumferential direction with a specific engaging tooth of the plurality of engaging teeth. The specific engagement teeth and the projecting plane interfere with each other so that the engagement of all the engagement teeth with the tooth surface is prevented.
Further, the other engagement member is brought into contact with an engagement protrusion formed on the specific engagement tooth by moving the specific engagement tooth in the engagement direction, and the engagement movement of the specific engagement tooth. and locking member having a locking surface which is assembled integrally blocking, the locking surface is first in a state wherein the projecting plane has Tsu Do heavy on the specific engagement tooth in the circumferential direction When in the 1 rotation position, the engagement protrusion formed on the specific engagement tooth has a relationship shifted in the circumferential direction and does not come into contact, but the projecting plane exceeds the first rotation position. By moving to the second rotation position moved in the direction further overlapping with the specific engagement tooth in the circumferential direction, the rotation position is overlapped with the engagement protrusion in the circumferential direction, and the engagement movement of the specific engagement tooth It is configured to be in a state that prevents
The projecting flat surface is formed to be short in the circumferential direction so as to maintain an interfering relationship with the specific engaging tooth in a rotation region until at least the locking surface overlaps the engaging protrusion in the circumferential direction. Among the rotation regions in which the two connecting members rotate relative to each other, the rotation region in which the plurality of meshing teeth can mesh with the tooth surface can lock the seat back at a desired backrest angle position. A rotation area that is set as an area and prevents the meshing movement of all of the meshing teeth by preventing the meshing of the specific engagement teeth falls from the area where the seat back is used as a backrest toward the fixed body. A rotation stopping device for a vehicle seat, which is set as a region.

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