JP6413800B2 - Seat adjustment device and vehicle seat device provided with the seat adjustment device - Google Patents

Description

  The present invention relates to a seat adjustment device and a vehicle seat device including the seat adjustment device.

  Conventionally, as a sheet adjusting device, for example, a device described in Patent Document 1 is known. The sheet adjusting device includes a first sheet member and a second sheet member which are rotatably connected, a first link member whose one end is rotatably connected to the first sheet member, and a second sheet A second link member having one end pivotally connected to the member and the other end pivotally connected to the first link member; a drive device (decelerator); and the drive device And a telescopic mechanism capable of reciprocating linear expansion and contraction. An expansion / contraction mechanism is rotatably connected to the other end of the first link member, and a driving device is rotatably connected to the second sheet member. Therefore, when the expansion / contraction mechanism performs a reciprocating linear expansion / contraction motion, the first link member rotates and the second link member rotates in conjunction with the rotation, so that the first sheet member rotates relative to the second sheet member. Move. Then, the rotation angle formed by the first sheet member and the second sheet member is adjusted. In particular, since the first link member constitutes a so-called lever link, the first sheet member can be rotated with a force obtained by enlarging a small thrust of the expansion / contraction mechanism.

Japanese Patent No. 5347635 (paragraphs [0016]-[0021], FIG. 1)

  By the way, in patent document 1, the expansion and contraction mechanism is composed of a screw and a nut using a screw action, that is, the power of an electric drive source (motor) that drives the drive device is the first due to the sliding contact between the screw and the nut. By being transmitted to the link member or the like, the transmission efficiency is inevitably lowered, and a higher output electric drive source is required.

  An object of the present invention is to provide a seat adjustment device that can further reduce power required for an electric drive source and a vehicle seat device including the seat adjustment device.

  A sheet adjusting device that solves the above problems includes a first link member having one end rotatably connected to a first sheet member, and a second sheet member rotatably connected to the first sheet member. A second link member having one end pivotally connected to the first link member and the other end pivotally connected to the first link member; and coupling the first link member and the second link member. A sector gear that rotates integrally with the first link member around a point, and a pinion that is pivotally supported by the second link member, is rotationally driven by an electric drive source, and meshes with the sector gear.

  According to this configuration, when the pinion is rotationally driven by the electric drive source, the sector gear rotates with respect to the second link member around the connection point together with the first link member. Thereby, the rotation angle which these 1st sheet members and the 2nd sheet member make is adjusted because the 1st sheet member and the 2nd sheet member rotate relatively. In this case, since the power of the electric drive source is transmitted to the first link member and the like by rolling contact of the pinion and the sector gear, the transmission efficiency can be further improved.

  With respect to the seat adjusting device, the second link member is formed with a bearing recess extending in parallel with an axis of rotation with respect to the second sheet member, and the first link member is rotated around the bearing recess. It is preferable that the second link member is pivotably connected by being fitted and movably inserted, and is pivotally connected to the first sheet member at an eccentric portion extending in parallel with the axis.

  According to this configuration, the first link member is rotatably fitted in the bearing recess, so that a fixture (for example, a pin) for connecting to the second link member can be omitted. . That is, the center of the bearing recess or the like corresponds to the connection point.

  In the seat adjustment device, the first sheet member has a pair of first side frames disposed on both sides in the sheet width direction, and the second sheet member is rotatable on the first side frames. A pair of second side frames coupled to each other, the pair of first link members and the second link members being arranged on both sides in the seat width direction, the electric drive source, The pinion and the sector gear are preferably disposed on one side in the common sheet width direction, and include a connecting member that extends in the sheet width direction and connects the first link members so as to rotate together. .

  According to this configuration, when the pinion is rotationally driven by the electrical drive source, the sector gear is disposed on the side of the first link member and the corresponding second link member centering on the connection point. Rotate with respect to. Further, when the first link member is rotated, the other first link member connected via the connecting member is also rotated with respect to the corresponding second link member. Thus, the first sheet member (both first side frames) and the second sheet member (both second side frames) rotate relative to each other, so that the first sheet member and the second sheet member rotate. The angle is adjusted. In this case, since the principle of the insulator acts on both the first link members, the rigidity required for the first link members can be further reduced.

  In the seat adjusting device, the bearing recess opens in the axial direction, and the first link member extends outwardly from a shaft portion passing through the bearing recess and one end of the shaft portion. It is preferable to have a retaining portion that abuts or approaches the peripheral edge of the bearing recess, and the sector gear is fixed to the other end of the shaft portion and abuts or approaches the peripheral edge of the bearing recess.

According to this configuration, the first link member can be prevented from dropping from the bearing recess by the cooperation of the retaining portion and the sector gear.
A vehicle seat device including the seat adjustment device includes a seat cushion and a seat back, and the seat back is tiltable with respect to a rear end portion of a seat cushion frame disposed in the seat cushion. The lower frame constituting one of the supported first sheet member and the second sheet member, and the other one of the first sheet member and the second sheet member disposed on the upper part of the lower frame It is preferable to adjust an inclination angle in the seat front-rear direction formed by the upper frame and the lower frame.

  According to this configuration, the posture of the seat back can be adjusted more finely by adjusting the inclination angle of the seat front-rear direction formed by the upper frame and the lower frame by the seat adjustment device, and the seating comfort can be adjusted. Comfort can be improved.

  The present invention has an effect of further reducing power required for an electric drive source.

The side view which shows the vehicle seat apparatus provided with the seat adjustment apparatus shown in FIG. 7 as a middle folding mechanism. The perspective view which shows a middle folding mechanism and its periphery structure. The disassembled perspective view which shows a middle folding mechanism and its periphery structure. Sectional drawing along line 4-4 in FIG. It is a side view which shows a middle folding mechanism, Comprising: The side view which shows the state which the upper frame fell back most. It is a side view which shows a middle folding mechanism, Comprising: The side view which shows the state which the upper frame fell most forward. The side view which shows typically the sheet | seat adjustment apparatus of one Embodiment.

Hereinafter, an embodiment of a seat adjustment device and a vehicle seat device including the seat adjustment device will be described.
As shown in FIG. 7, the first sheet member 101 and the second sheet member 102 are connected to each other on the left side in the figure so as to be relatively rotatable by a rotation shaft 103. The sheet adjusting device 110 is interposed between the first sheet member 101 and the second sheet member 102. That is, the sheet adjusting apparatus 110 includes a first link member 111 having one end 111a rotatably connected to the first sheet member 101 by a rotating shaft 121 on the right side in the drawing. In addition, the sheet adjusting device 110 has one end 112a rotatably connected to the second sheet member 102 by the rotating shaft 122 and the first link member by the rotating shaft 123 on the left side of the rotating shaft 121 in the drawing. 111 is provided with a second link member 112 having the other end 112b rotatably connected thereto. Further, the sheet adjusting device 110 includes a sector gear 113 that rotates integrally with the first link member 111 around the rotation shaft 123 (a connection point P between the first link member 111 and the second link member 112), and a second link member. 112 and a pinion 114 that is supported by the sector gear 113 and meshed with the sector gear 113. The pinion 114 is rotationally driven by an electric drive source (not shown) such as a motor. Note that all the axes of the rotating shafts 121 to 123 and the pinion 114 extend in a direction perpendicular to the paper surface.

  Here, when the pinion 114 is rotationally driven by the electrical drive source, the sector gear 113 rotates with respect to the second link member 112 around the connection point P together with the first link member 111. As a result, the first sheet member 101 and the second sheet member 102 are rotated relative to each other about the rotation shaft 103, so that the rotation angle formed by the first sheet member 101 and the second sheet member 102 is adjusted. . In this case, the power of the electric drive source is transmitted to the first link member 111 and the like by the rolling contact of the pinion 114 and the sector gear 113, so that the transmission efficiency can be further improved.

  The first link member 111 integrated with the sector gear 113 is a so-called point where the meshing position Q with the pinion 114 serves as a power point, the connection point P serves as a fulcrum, and the connection point R with the first sheet member 101 serves as an action point. The lion link is configured. Therefore, by setting the distance L1 between the fulcrum and the force point (the connection point P and the meshing position Q) to be longer than the distance L2 between the fulcrum and the action point (the connection points P and R), the small power of the electric drive source The first sheet member 101 can be rotated with a force obtained by enlarging (rotational force). That is, the following relationship is established between the power F1 of the electric drive source at the force point (meshing position Q) and the force F2 at the action point (connection point R).

F1 × L1 = F2 × L2 (L1> L2)
This confirms that a large force F2 can be obtained even if the power F1 of the electrical drive source is small. Such an effect can be realized relatively easily by changing the shape of the sector gear 113, for example.

  Next, an example in which the above-described seat adjustment device 110 is applied to a middle folding mechanism of a vehicle seat device mounted on the front seat side of a vehicle such as an automobile will be described. Hereinafter, the front-rear direction of the sheet is referred to as “front-rear direction”, and the width direction of the sheet is referred to as “width direction”. The upper and lower parts in the seat height direction are referred to as “upper” and “lower”, respectively.

  As shown in FIG. 1, in this vehicle seat device, a seat back 2 forming a backrest portion is supported at a lower end portion thereof so as to be tiltable in the front-rear direction at a rear end portion of a seat cushion 1 forming a seating portion of an occupant. It is composed of that. And the seat back 2 is divided | segmented into the lower seat back 3 which can support a passenger | crew's waist | hip | lumbar part, and the upper seat back 4 which can support a scapula. The seat back 2 is supported at the lower end portion of the lower seat back 3 so as to be tiltable in the front-rear direction at the rear end portion of the seat cushion 1. A headrest 5 for supporting the head of the occupant is installed at the upper end of the seat back 2 (upper seat back 4) so as to be able to advance and retract in the seat height direction.

  That is, on both sides of the seat cushion 1 in the width direction (direction orthogonal to the paper surface in FIG. 1), a pair of seat cushion frames 1a made of, for example, a metal plate, which is a skeleton of the seat cushion 1, are disposed. A well-known reclining mechanism 6 is fixed to the rear end portion from the inner side in the width direction. On the other hand, as shown in FIG. 2, on both sides in the width direction of the lower seat back 3, lower side frames 7 are disposed as a pair of second side frames made of, for example, a metal plate. Both lower side frames 7 constitute a second seat member and a lower frame. A reclining mechanism 6 is fixed to the lower ends of the lower side frames 7 from the outside in the width direction. The seat back 2 (lower seat back 3) can be tilted in the front-rear direction with respect to the seat cushion 1 by connecting the lower end portion of the lower side frame 7 to the rear end portion of the seat cushion frame 1a via the reclining mechanism 6. Become. Alternatively, the seat back 2 (lower seat back 3) can be arbitrarily held within the adjustment range of the inclination angle in the front-rear direction with respect to the seat cushion 1.

  Further, on both sides of the upper seat back 4 in the width direction, upper side frames 8 are disposed as a pair of first side frames made of, for example, a metal plate, which forms a skeleton thereof. The upper ends of the upper side frames 8 are connected to each other in the width direction via a substantially U-shaped pipe frame 9 made of, for example, a metal cylinder that forms the skeleton of the upper seat back 4. Both the upper side frames 8 and the pipe frame 9 constitute a first seat member and an upper frame. The upper end portion of each lower side frame 7 and the lower end portion of each upper side frame 8 that is superimposed on the upper end portion from the outside in the width direction are formed by a substantially cylindrical rotating shaft 10 that penetrates the front end portion in the width direction. It is rotatably connected around an axis extending in the direction.

  A folding mechanism 20 is interposed between the lower side frame 7 and the upper side frame 8 on one side (right side in FIG. 2), and between the lower side frame 7 and the upper side frame 8 on the other side (same left side). The intermediate folding mechanism 30 is interposed. The folding mechanism 20 holds a drive device 40 having a motor 41 as an electrical drive source.

  As shown in FIG. 3, a substantially cylindrical bush 21 having a center line extending in the width direction below the rotating shaft 10 is joined to the inner surface in the width direction of the lower side frame 7 on one side. A substantially arm-shaped fulcrum link 22 as a second link member extending in the longitudinal direction of the lower side frame 7 is disposed on the inner side in the width direction of the lower side frame 7. A substantially circular mounting hole 22a concentric with the bush 21 is formed at the lower end portion of the fulcrum link 22, and a substantially cylindrical bush 23 is press-fitted into the mounting hole 22a. The bush 23 is, for example, a thin plate coated with a low friction material, and the inner diameter thereof is set to be equal to the outer diameter of the end portion on the inner side in the width direction of the bush 21. The fulcrum link 22 is inserted into the bush 23 so that the end of the bush 21 is rotatable, and a screw portion of a bolt 24 is inserted into the center portion of the bush 21 from the inner side in the width direction. When the nut 25 is fastened to the screw portion 24, the nut 25 is fastened to the lower side frame 7 around the axis A1 extending in the width direction.

  The upper end of the fulcrum link 22 is formed with a substantially circular mounting hole 22b as a bearing recess extending in the width direction above the lower side frame 7 in the width direction. The mounting hole 22b has a substantially cylindrical shape. A bush 26 is press-fitted. The bush 26 is, for example, a thin plate coated with a low friction material. In addition, a substantially circular bearing hole 22c having an axial line extending in the width direction is formed below the upper side frame 8 in an intermediate portion in the longitudinal direction of the fulcrum link 22.

  A substantially disc-shaped eccentric ring 27 as a first link member is fitted into the bush 26 so as to be rotatable from the outside in the width direction. This eccentric ring 27 has an outer diameter equivalent to the inner diameter of the bush 26 and has a shaft portion 27a fitted into the bush 26, and from the outer end in the width direction passing through the bush 26 of the shaft portion 27a. A substantially flange-shaped retaining portion 27b extending outward is provided. Needless to say, the eccentric ring 27 is rotatable around an axis A2 extending along the center line of the mounting hole 22b (bush 26). The eccentric ring 27 is formed with a substantially circular mounting hole 27c as an eccentric portion extending in the center line in parallel with the axis A2, and a substantially cylindrical bush 28 is press-fitted into the mounting hole 27c. Yes. The bush 28 is, for example, a thin plate coated with a low friction material.

  A sector gear 42 made of, for example, a metal plate is firmly fixed to the front end of the shaft portion 27a passing through the bush 26 in the width direction by welding. In the sector gear 42, a gear portion 42a is formed along the circumferential direction centering on the axis A2, and a substantially circular eccentric hole 42b concentric with the bush 28 is formed. The inner diameter of the eccentric hole 42 b is set to be equal to the inner diameter of the bush 28. As shown in FIG. 4, the eccentric ring 27 is in contact with or close to the peripheral edge of the mounting hole 22b in the retaining portion 27b, and the sector gear 42 is in contact with or close to the peripheral edge of the mounting hole 22b. doing. Accordingly, the cooperation of the retaining portion 27b and the sector gear 42 prevents the eccentric ring 27 from falling off the mounting hole 22b (bush 26).

  As shown in FIG. 3, an arm member 29 made of, for example, a metal plate is firmly fixed to the inner side surface in the width direction of the sector gear 42 by welding. The arm member 29 has a substantially disk-shaped fixing part 29a concentric with the eccentric ring 27 and a substantially square plate-like attachment part 29b extending inward in the width direction from the rear end of the fixing part 29a. The arm member 29 is joined to the sector gear 42 at the fixed portion 29a. The fixing portion 29a is formed with a substantially circular insertion hole 29c concentric with the eccentric hole 42b (bush 28).

  A substantially cylindrical bush 31 concentric with the mounting hole 27c (bush 28) is joined to the inner side surface in the width direction of the upper side frame 8 on one side, which is obliquely upper rearward of the rotation shaft 10. The outer diameter of the inner end in the width direction of the bush 31 is set to be equal to the inner diameter of the bush 28. An end portion of the bush 31 is rotatably inserted into the bush 28 or the like. The eccentric ring 27, the sector gear 42, and the arm member 29 are inserted into the center portion of the bush 31 from the inner side in the width direction, and the nut 33 is tightened to the thread portion of the bolt 32 that passes through the bush 31. As a result, the upper side frame 8 is fastened around the axis A3 extending in the width direction.

  The intermediate folding mechanism 20 is configured by the fulcrum link 22 (excluding the sector gear 42) interposed between the lower side frame 7 and the upper side frame 8 on one side. A similar fulcrum link 22 and the like are interposed between the lower side frame 7 and the upper side frame 8 on the other side, so that the middle folding mechanism 30 is configured. However, the eccentric ring 27 and the arm member 29 of the folding mechanism 30 are directly joined without using the sector gear 42. That is, the fixed portion 29a is directly fixed to the inner end in the width direction passing through the bush 26 of the shaft portion 27a of the eccentric ring 27 by welding. In this case, due to the cooperation of the retaining portion 27b and the arm member 29, the eccentric ring 27 is prevented from dropping from the mounting hole 22b (bush 26).

  The front end of a connecting member 34 made of, for example, a metal rod extending in the width direction is firmly fixed to the attachment portion 29b of the arm member 29 by, for example, bolt / nut fastening. Thereby, both the arm members 29 are connected in the width direction by the connecting member 34. Therefore, the eccentric ring 27, the arm member 29, and the sector gear 42 of both the middle folding mechanisms 20 and 30 are connected via the connecting member 34 so as to integrally rotate around the axis A2.

  A pinion 43 is pivotally supported on the fulcrum link 22. That is, the pinion 43 has a substantially cylindrical shaft portion 43a concentric with the bearing hole 22c, a gear portion 43b provided on the outer peripheral portion of the shaft portion 43a, and further on the inner side in the width direction of the gear portion 43b. A substantially quadrangular prism-shaped fitting portion 43c provided adjacent to the outer peripheral portion of the shaft portion 43a is provided. In the state where the gear portion 43b is engaged with the gear portion 42a of the sector gear 42, the pinion 43 is rotatably inserted into the bearing hole 22c at the outer end in the width direction of the shaft portion 43a.

  A pair of gear cases 44 and 45 that rotatably support the pinion 43 are attached to the fulcrum link 22. That is, both the gear cases 44 and 45 are formed in a substantially box shape with the opening sides facing each other in the width direction, and rotatably accommodate the worm wheel 46 arranged coaxially with the pinion 43. The worm wheel 46 is formed with a substantially rectangular fitting hole 46a that is formed in conformity with the outer surface of the fitting portion 43c. In the pinion 43, the fitting portion 43 c is fitted into the fitting hole 46 a with the end portion on the inner side in the width direction of the shaft portion 43 a being inserted into the center portion of the worm wheel 46. As a result, the pinion 43 is rotatably supported by the gear cases 44 and 45 via the worm wheel 46.

  Moreover, both the gear cases 44 and 45 rotatably accommodate a worm 47 that meshes with the worm wheel 46. The worm 47 is disposed substantially coaxially with the rotating shaft of the motor 41, and both end portions in the axial direction are inserted into the washer 48 and are supported by a substantially cylindrical bush 49. Both the gear cases 44 and 45 are fixed to each other on the outer peripheral side of the bush 49 by a ring plate 50 straddling them. The two gear cases 44 and 45 are integrally fastened to the fulcrum link 22 by a plurality of bolts 51 that penetrate the worm wheel 46 from the inner side to the outer side in the width direction. The gear cases 44 and 45, the worm wheel 46, the worm 47, and the like constitute a reduction gear 55.

  The rotating shaft of the motor 41 is connected to the torque cable 52 so as to rotate integrally, and the tip end portion of the torque cable 52 is fitted to the worm 47 so as to rotate integrally. Accordingly, when the rotation shaft of the motor 41 rotates together with the torque cable 52 and the worm 47, the worm wheel 46 meshing with the worm 47 rotates together with the pinion 43, and the sector gear 42 meshing with the pinion 43 rotates. The motor 41, the sector gear 42, the pinion 43, the torque cable 52, and the reduction gear 55 constitute the drive device 40. That is, the fulcrum link 22 that pivotally supports the eccentric ring 27 and the pinion 43 and is attached to the speed reduction device 55 holds the entire drive device 40.

Next, the operation of this embodiment will be described.
As shown in FIG. 5, first, the axis A3 (corresponding to the connection point R) of the bolt 32 (mounting hole 27c) is located obliquely behind and below the axis A2 (corresponding to the connection point P) of the eccentric ring 27. And In this state, when the pinion 43 is rotationally driven clockwise by the motor 41 in the state, the sector gear 42 rotates together with the eccentric ring 27 counterclockwise with respect to the fulcrum link 22 around the connection point P. As a result, as shown in the change to FIG. 6, the upper side frame 8 rotates about the rotation shaft 10 counterclockwise with respect to the lower side frame 7. At this time, the axis A3 (connection point R) of the bolt 32 (mounting hole 27c) is located obliquely above and behind the axis A2 (connection point P) of the eccentric ring 27.

  On the other hand, when the pinion 43 is rotated counterclockwise by the motor 41 in the state shown in FIG. 6, the sector gear 42 together with the eccentric ring 27 rotates clockwise with respect to the fulcrum link 22 around the connection point P. Rotate. As a result, as shown in the change to FIG. 5, the upper side frame 8 rotates about the rotation shaft 10 in the clockwise direction with respect to the lower side frame 7.

  As described above, the rotation angle formed by the lower side frame 7 and the upper side frame 8 is adjusted. In the present embodiment, the relative rotation of the upper side frame 8 and the lower side frame 7 is set to be decelerated with respect to the rotation of the eccentric ring 27 with respect to the fulcrum link 22. That is, the relative rotation amount of the upper side frame 8 and the lower side frame 7 is set to be reduced with respect to the rotation amount of the eccentric ring 27 with respect to the fulcrum link 22. Specifically, the upper side frame 8, the fulcrum link 22 and the eccentric ring 27 are regarded as a link mechanism having the rotation shaft 10 and the bolt 24 as fixed ends, and the above-described relative length is set by setting the substantial length thereof. Setting of the amount of rotation is realized.

  Further, as shown in FIGS. 5 and 6, both ends in the circumferential direction of the gear portion 42 a are reached when the pinion 43 reaches one of the both ends (the rearmost or foremost part of the meshable range with the pinion 43). The pinion 43 (and the sector gear 42) is formed so as to be restricted in rotation. Therefore, the rotation angle formed by the lower side frame 7 and the upper side frame 8 is limited to an angle range corresponding to the range between the rotation positions where the sector gear 42 is restricted from rotating.

  As shown in FIG. 5, the distance BC between the fastening point B of the lower side frame 7 and the fulcrum link 22 (corresponding to the axis A1) and the fastening point C of the upper side frame 8 and the eccentric ring 27 (corresponding to the axis A3). When paying attention, the distance BC becomes the shortest when the meshing position Q of the sector gear 42 and the pinion 43 is located at the end of their meshable range. Then, the upper side frame 8 (upper seat back 4) is in the most tilted posture. On the other hand, as shown in FIG. 6, when the meshing position Q of the sector gear 42 and the pinion 43 is located in the forefront of the meshable range, the distance BC becomes the longest and the upper side frame 8 (upper seat back 4). Is in the most prone posture. That is, for example, when the meshing position Q of the sector gear 42 and the pinion 43 moves to the front of their meshable range with the rotation of the pinion 43, the distance BC becomes long accordingly, and the upper side frame 8 (upper The seat back 4) tilts forward about the pivot shaft 10.

Here, since the power of the motor 41 is transmitted to the eccentric ring 27 and the like by the rolling contact of the pinion 43 and the sector gear 42, the transmission efficiency can be further improved.
As described above in detail, according to the present embodiment, the following effects can be obtained.

  (1) In this embodiment, the power of the motor 41 is transmitted to the eccentric ring 27 and the like by the rolling contact of the pinion 43 and the sector gear 42, so that the transmission efficiency can be further improved. Then, the force required to rotate the upper side frame 8 can be ensured with a smaller power (rotational force) of the motor 41.

  The eccentric ring 27 integrated with the sector gear 42 has a meshing position Q with the pinion 43 as a power point, and a connection point P (corresponding to the center of the eccentric ring 27 and the like) with the fulcrum link 22 as a fulcrum. 8 constitutes a so-called lever link whose acting point is the connection point R. For this reason, by setting the distance between the fulcrum and the power point to be longer than the distance between the fulcrum and the action point, the upper side frame 8 can be rotated with a force obtained by enlarging the small power (rotational force) of the motor 41. . Such an operation can be realized relatively easily by changing the shape of the sector gear 42, for example.

  As described above, the power (output) required for the motor 41 can be further reduced, or the load applied to the speed reduction device 55 can be further reduced. As a result, the motor 41 and the speed reduction device 55 can be further downsized. it can.

  (2) In the present embodiment, the eccentric ring 27 is rotatably inserted into the mounting hole 22b (bush 26), thereby omitting a fixture (for example, a pin) for connecting to the fulcrum link 22. Can do. For this reason, the arrangement | positioning freedom degree of the connection point R (equivalent to the center of the attachment hole 27c etc.) of the eccentric ring 27 and the upper side frame 8 can be improved more. The mounting hole 27c and the like are arranged on the inner peripheral side of the mounting hole 22b (bush 26), so that the fulcrum and the action point (connection point R) with respect to the distance between the fulcrum (connection point P) and the force point (meshing position Q). ) Can be set longer, and the power (rotational force) required for the motor 41 can be further reduced.

  (3) In this embodiment, the fulcrum link 22 and the eccentric ring 27 are paired so as to be arranged on both sides in the width direction. On the other hand, the drive device 40 is disposed on one side in the width direction. That is, the motor 41, the pinion 43, the sector gear 42, and the like are arranged on one side in the common width direction. The two eccentric rings 27 are connected by a connecting member 34 so as to rotate integrally (that is, the lever links on both sides are connected by the connecting member 34). Therefore, when the pinion 43 is rotationally driven by the motor 41, the sector gear 42 rotates with respect to the corresponding fulcrum link 22 around the connection point P together with the one eccentric ring 27 (and the arm member 29) on the arrangement side. To do. Further, when the eccentric ring 27 rotates, the other eccentric ring 27 (and the arm member 29) connected via the connecting member 34 also rotates with respect to the corresponding fulcrum link 22. Thereby, both the upper side frames 8 (upper frame) and both the lower side frames 7 (lower frame) rotate relative to each other, thereby adjusting the rotation angle between them. In this case, since the lever principle acts on both eccentric rings 27, the rigidity required for both eccentric rings 27 and the like can be further reduced.

  Alternatively, for example, the connecting member 34 is omitted, and the power of the motor 41 is transmitted from the upper side frame 8 on one side to the upper side frame 8 on the opposite side via the pipe frame 9. Generation of twisting can be suppressed, and the required rigidity can be further reduced.

  (4) In the present embodiment, the eccentric ring 27 extends outward from one end of the shaft portion 27a passing through the mounting hole 22b (bush 26) and comes into contact with or closes to the peripheral portion of the mounting hole 22b. The sector gear 42 is fixed to the other end of the shaft portion 27a and abuts or approaches the peripheral edge portion of the mounting hole 22b. Therefore, by the cooperation of the retaining portion 27b and the sector gear 42, it is possible to suppress the eccentric ring 27 from dropping from the mounting hole 22b (bush 26).

  (5) In this embodiment, by adjusting the tilt angle in the front-rear direction formed by the upper side frame 8 (upper frame) and the lower side frame 7 (lower frame) by the folding mechanisms 20 and 30 and the connecting member 34, The posture of the seat back 2 can be adjusted more finely, and the comfort of sitting comfort can be improved.

(6) In this embodiment, since the drive device 40 only needs to be provided on one side of the seat back 2, the number of parts can be reduced, and as a result, the mass and cost can be reduced.
(7) In the present embodiment, the motor 41 and the like need only be provided on the lower side frame 7 on one side. The width dimension to be expanded can be expanded. Although the connecting member 34 extends in the width direction between the upper side frames 8, it can adopt a free shape such as a shape along the back of the occupant, and serves as a backrest portion of the seat back 2. Has little or no impact on the function of

  Alternatively, for example, it is not necessary to secure a distance from the occupant's back as in the case where the motor 41 or the like is provided in the intermediate portion in the width direction of the seat back 2, so that the thickness of the seat back 2 in the front-rear direction is further reduced be able to.

  (8) In the present embodiment, the middle folding mechanisms 20 and 30 are disposed on both sides in the width direction of the seat back 2, so that, for example, the one side folding mechanism 30 is omitted and the lower side frame 7 and the upper side on the side are omitted. The support rigidity can be further increased compared to the case where the frame 8 is connected only by the rotation shaft 10. Further, for example, the load applied to the upper seat back 4 can be received by the two folding mechanisms 20 and 30, and the strength required for the driving device 40 can be further reduced.

In addition, you may change the said embodiment as follows.
-In the said embodiment, the reduction gear 55 may be comprised by the planetary gear, for example. Further, the speed reduction device 55 may be omitted, and the rotation shaft (or torque cable 52) of the motor 41 may be directly connected to the pinion 43.

In the embodiment, any two or more of the eccentric ring 27, the arm member 29, and the sector gear 42 may be integrally formed.
In the above embodiment, at least one of the arm members 29 and the connecting member 34 may be integrally formed.

  In the embodiment, the arm member 29 may be omitted, and for example, the eccentric ring 27 may be directly fixed to the connecting member 34. Alternatively, the arm member 29 may be omitted, and at least one of the four eccentric rings 27 and the connecting member 34 may be integrally formed.

  -In the said embodiment, the fastening structure of the lower side frame 7 and the fulcrum link 22 is an example. For example, instead of the bush 21, the bolt 24, and the nut 25, they may be fastened with a caulking pin that penetrates the lower side frame 7 and the fulcrum link 22.

  In the embodiment, the fastening structure of the upper side frame 8 and the eccentric ring 27 is an example. For example, instead of the bush 31, the bolt 32, and the nut 33, the upper side frame 8 and the eccentric ring 27 (and the arm member 29, the sector gear 42) may be fastened with a swaging pin.

  In the above-described embodiment, the retaining portion 27 b of the eccentric ring 27 may be formed in advance before the eccentric ring 27 is attached to the fulcrum link 22. In this case, the eccentric ring 27 may be joined to the sector gear 42 at the tip thereof after the shaft portion 27a is fitted into the mounting hole 22b (bush 26). Alternatively, the retaining portion 27b of the eccentric ring 27 may be formed by caulking, for example, after the eccentric ring 27 is assembled to the fulcrum link 22. In this case, the eccentric ring 27 and the sector gear 42 may be joined in advance before the shaft portion 27a is inserted into the mounting hole 22b (bush 26).

  -In the said embodiment, the attachment hole 22b does not need to open in the axial direction. In this case, the sector gear 42 may be disposed on the same side as the eccentric ring 27 with respect to the fulcrum link 22 in the width direction. Further, the retaining portion 27b of the eccentric ring 27 may be omitted.

In the above-described embodiment, the driving device 40 may be provided in each of the lower side frames 7. In this case, the connecting member 34 (and the arm member 29) may be omitted.
In the above embodiment, each of the lower side frames 7 may be provided with a driving device 40 (except for the motor 41). A common motor 41 is provided between the lower side frames 7 so that the axis of the rotating shaft extends in the width direction, and an interlocking torque cable that is routed directly or in the width direction is provided. And may be connected to the both pinions 43 so as to rotate together. In this case, the connecting member 34 (and the arm member 29) may be omitted.

  -In the said embodiment, the arrangement | positioning relationship of the fulcrum link 22 and the eccentric ring 27, and the lower side frame 7 and the upper side frame 8 may mutually be reverse. That is, the fulcrum link 22 may be rotatably connected to the upper side frame 8, and the eccentric ring 27 (eccentric part) may be rotatably connected to the lower side frame 7.

  In the above-described embodiment, the seat adjustment device (the middle folding mechanisms 20 and 30 and the connecting member 34) for tilting the upper seat back 4 of the vehicle seat device with respect to the lower seat back 3 has been described. Is not to be done. The seat adjustment device (110) can be applied to, for example, the reclining mechanism 6, the front and rear of the seat cushion 1, the vertical slide mechanism, the length adjustment mechanism of the seat cushion 1, the ottoman mechanism, and the like. Further, the present invention is not limited to various adjustment mechanisms of the vehicle seat device, and can be applied to, for example, a tilt adjustment mechanism and a lock mechanism of a steering device.

  P: connecting point, Q: meshing position, R: connecting point, 1 ... seat cushion, 1a ... seat cushion frame, 2 ... seat back, 7 ... lower side frame (second side frame, lower frame, second seat member) , 8 ... Upper side frame (first side frame, upper frame, first sheet member), 9 ... Pipe frame (upper frame, first sheet member), 10 ... Rotating shaft, 20, 30 ... Folding mechanism (sheet) Adjusting device), 22 ... fulcrum link (second link member), 27 ... eccentric ring (first link member), 22a ... mounting hole, 22b ... mounting hole (bearing recess), 27a ... shaft part, 27b ... retaining part 27c ... Mounting hole (eccentric part), 34 ... connecting member, 41 ... motor (electric drive source), 42,113 ... sector gear, 43,114 ... pinion, 110 ... sheet adjusting device, 01 ... the first sheet member, 102 ... second sheet member, 111 ... first link member, 111a ... end, 112: second link members, 112a, 112b ... end.

Claims (5)

A first link member having one end rotatably connected to the first sheet member;
A second sheet member pivotally connected to the first sheet member is pivotally connected at one end, and the other end is pivotally coupled to the first link member. A link member;
A sector gear that rotates integrally with the first link member around a connection point of the first link member and the second link member;
And a pinion that is pivotally supported by the second link member, is rotationally driven by an electric drive source, and meshes with the sector gear. In the sheet adjustment apparatus according to claim 1,
The second link member is formed with a bearing recess whose axis extends parallel to the axis of rotation with respect to the second sheet member,
The first link member is rotatably connected to the second link member by being rotatably inserted into the bearing recess, and the first sheet member is attached to the first sheet member at an eccentric portion extending in parallel with the axis thereof. A sheet adjustment device that is rotatably connected. In the sheet adjustment apparatus according to claim 1 or 2,
The first sheet member has a pair of first side frames arranged on both sides in the sheet width direction,
The second sheet member has a pair of second side frames rotatably connected to the first side frames.
The first link member and the second link member have a pair so as to be arranged on both sides in the sheet width direction,
The electric drive source, the pinion and the sector gear are arranged on one side in the common sheet width direction,
A sheet adjusting apparatus comprising a connecting member that extends in the sheet width direction and connects the first link members so as to rotate together. In the sheet adjustment apparatus according to claim 2,
The bearing recess is open in the axial direction thereof,
The first link member has a shaft portion that penetrates the bearing recess, and a retaining portion that extends outward from one tip of the shaft portion and contacts or approaches the peripheral edge of the bearing recess,
The sector gear is a seat adjusting device, which is fixed to the other end of the shaft portion and is in contact with or close to a peripheral edge portion of the bearing recess. With seat cushion and seat back,
The seat back is
A lower frame constituting one of the first seat member and the second seat member supported at the lower end so as to be tiltable with respect to a rear end of the seat cushion frame disposed in the seat cushion;
An upper frame constituting the other of the first sheet member and the second sheet member disposed on the lower frame;
A vehicle seat device comprising: the seat adjustment device according to any one of claims 1 to 4 that adjusts an inclination angle of a seat front-rear direction formed by the upper frame and the lower frame.