JP5862356B2 - Vehicle seat - Google Patents

Description

  The present invention relates to a vehicle seat. Specifically, a locking device that locks the backrest angle of the seatback is provided on both the left and right sides of the seatback, and a connecting rod that serves as a power transmission member for simultaneously releasing the locked state between the locking devices. The present invention relates to a vehicle seat that extends in the axial direction.

  Conventionally, in a vehicle seat, a configuration in which a pair of reclining devices is provided between a seat back and a seat cushion is known (Patent Document 1). These reclining devices function as a rotation shaft device capable of stopping rotation that allows adjustment of the backrest angle of the seat back, and are normally held in a state where the backrest angle of the seat back is locked. . These reclining devices are switched to a state in which the locked state of the seat back can be changed by changing the operation state of the operation shaft inserted through the center of the reclining device. The operation shafts are connected to each other by a connecting rod so that they can rotate integrally with each other, and each operation shaft is operated by pulling up a release lever that is connected to the end of the operation shaft on one side. The shafts are simultaneously operated to release the locked state of each reclining device. The connecting rod described above is entirely covered with a pipe-shaped protective member so that the seating occupant will not be bent or damaged by the load on the seat back. It is in a state.

Japanese Patent Laid-Open No. 9-207639

  In the above prior art, if there is no protective member for protecting the connecting rod, the rear part of the occupant is pushed when the back of the seated occupant is pressed against the back of the seat, such as by a rear collision of the vehicle. There is a possibility that the (lumbar region) interferes with the connecting rod, and the connecting rod is pushed in the releasing operation direction by friction with the momentum. However, since setting the protection member leads to an increase in the number of parts and manufacturing cost, it is preferable that the above problem can be solved without setting the protection member. The present invention was devised as a solution to the above-mentioned problem, and the problem to be solved by the present invention is that the connecting rod is released by interference with the back of the seated occupant without setting a protective member. It is to prevent the situation where it is turned in the direction.

In order to solve the above problems, the vehicle seat of the present invention takes the following means.
According to a first aspect of the present invention, there is provided a lock device that locks a backrest angle of the seat back on both left and right side portions of the seat back, and a power transmission member for simultaneously releasing the lock state between the lock devices; The connecting rod is a vehicle seat extended in the axial direction. Each lock device is configured such that the respective lock states are released when the respective operation shafts set at positions on the coaxial lines are operated to rotate in the release operation direction. The connecting rod connects the operation shafts in a state where power can be transmitted to each other. The position of the interference point that interferes when the back of the seated occupant of the connecting rod moves backward is usually closer to the axis center of each operating shaft than the general position defined by the outer periphery shape of the connecting rod that connects the operating shafts. By setting them closer, the rotational torque that is rubbed in the rotational direction at the time of interference and rotated in the release operation direction is reduced.

  According to the first aspect of the invention, by setting the position of the interference point of the connecting rod close to the axis center of each operation shaft, the interference point is rubbed in the rotational direction when it interferes with the back of the seated occupant. The rotational torque turned in the release operation direction can be reduced. Therefore, it is possible to prevent the connecting rod from being turned in the release operation direction due to interference with the back of the seated occupant.

  According to a second invention, in the first invention described above, the position of the interference point of the connecting rod is brought closer to the axial center of each operation shaft by shifting the connecting rod in the height direction or the rear side.

  According to the second aspect of the invention, by shifting the connecting rod in the height direction or the rear side, the position of the interference point serving as the load input point is shifted in the height direction or the rear side, and the axis center of each operation shaft is To be close to. Thus, with a simple configuration in which the setting position of the connecting rod is shifted in the height direction or the rear side, the rotational torque applied at the time of interference can be reduced without changing the shape of the connecting rod.

  According to a third invention, in the second invention described above, the position of the interference point of the connecting rod is made closer to the axial center of each operation shaft in the radial direction by shifting the connecting rod in the height direction and the rear side. Is.

  According to the third aspect of the invention, the connecting rod is shifted in the height direction and the rear side, and the position of the interference point is inclined obliquely in the radial direction toward the axis center of each operation axis, whereby the interference point is operated in each operation. It is possible to effectively approach the axis center of the axis. Therefore, the rotational torque applied at the time of interference can be effectively reduced.

  According to a fourth invention, in any one of the first to third inventions described above, the connecting rod is thicker than each operation shaft and is positioned between both side frames of the seat back in the approaching direction between the two side frames. It is comprised as a reinforcement member which prevents a deformation | transformation movement.

  According to the fourth invention, even if the connecting rod has a thick structure that functions as a reinforcing member, the connecting rod is seated by reducing the rotational torque by bringing the position of the interference point of the connecting rod closer to the axial center. It is possible to prevent a situation where the vehicle is turned in the release operation direction due to interference with the back of the occupant.

1 is a perspective view illustrating a schematic configuration of a vehicle seat according to Embodiment 1. FIG. It is a side view of a vehicle seat. It is the III-III sectional view taken on the line of FIG. It is a side view which shows the state which the back part of the seated passenger | crew interfered with the connecting rod by the rear part collision of the vehicle. It is a disassembled perspective view of a reclining apparatus. It is a perspective view showing the connection structure of a seat back frame and a reclining device. It is a perspective view showing the connection structure of a seat cushion frame and a reclining device. It is the VIII-VIII sectional view taken on the line of FIG. 3 showing the locked state of the reclining apparatus. It is sectional drawing showing the unlocking state of a reclining apparatus. 6 is a perspective view of a vehicle seat according to Embodiment 2. FIG. (Dented) It is a side view of a vehicle seat. It is the XII-XII sectional view taken on the line of FIG.

  EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated using drawing.

  First, the configuration of the vehicle seat 1 according to the first embodiment will be described with reference to FIGS. As shown in FIG. 1, the vehicle seat 1 according to the present embodiment is configured as a passenger seat of a vehicle, and includes a seat back 2 serving as a backrest and a seat cushion 3 serving as a seating portion. The seat cushion 3 is installed on the floor of the vehicle, and the seat back 3 has a lower end portion on both the left and right sides of the seat cushion 3 via a reclining device 4 that functions as a rotation shaft device that can stop rotation. It is the composition connected to. Here, each reclining device 4 corresponds to a “lock device” of the present invention.

  Specifically, each reclining device 4 includes a lower end portion on both the left and right sides of the seat back frame 2f forming the skeleton of the seat back 2, a rear end portion on both the left and right sides of the seat cushion frame 3f forming the skeleton of the seat cushion 3, Between the lower end portions of the left and right sides of the seat back frame 2f and the rear end portions of the left and right sides of the seat cushion frame 3f. It is connected to become. Thus, the seat back 2 is connected to the seat cushion 3 in a state where the backrest angle can be adjusted in the front-rear direction of the seat. Each of the reclining devices 4 can be switched between a state in which the backrest angle of the seat back 2 can be changed (unlocked state) and a locked state by a rotation stop structure (lock structure) provided therein. It has become.

  Specifically, each of the reclining devices 4 can be switched to a locked / unlocked state in accordance with a shaft rotation operation of each operation shaft 4c inserted through the center portion thereof, and each operation shaft 4c. Are integrally connected to each other by the connecting rod 7 so that the locking / unlocking switching operations are performed simultaneously in synchronism with the left and right. Each of the reclining devices 4 is normally held in an operating state locked by a spring urging structure, which will be described later, and is held in a state in which the backrest angle of the seat back 2 is fixed.

  The fixed state of the backrest angle of the seat back 2 is such that the operation shafts 4c are simultaneously rotated by an operation of pulling up the operation lever 5 provided on the side of the seat cushion 3 on the vehicle outer side (right side in FIG. 1). It is to be released when operated. By this releasing operation, the seat back 2 can be freely adjusted in its backrest angle. Further, by stopping the release operation, the reclining devices 4 are again returned to the locked state by the spring biasing structure, and the backrest angle of the seat back 2 is returned to the fixed state.

  Here, between the left and right side portions of the seat back frame 2f and the left and right side portions of the seat cushion frame 3f, spiral springs 6 that constantly urge the seat back 2 to rotate forward are seated. It is worn. As shown in FIG. 1, these spiral springs 6 are hooked on a cut-and-raised plate 3d formed by cutting and raising the inner ends (inner ends 6a) of the left and right outer side portions of the seat cushion frame 3f. The outer end portion (outer end 6b) is attached to the rear edge portion of the plate portion that projects to both outer sides of the L-shaped plate 2d coupled to the left and right outer side portions of the seat back frame 2f. Each is hooked and fixed. The seat back 2 is lifted up to a position where the seat back 2 hits the back of the seat occupant by releasing the fixed state of the backrest angle by the urging force of the spiral spring 6, and the back of the seat occupant is tilted back and forth. The backrest angle position can be freely changed following this.

  When the seat back 2 described above is in the angle region of the rearward tilt posture in which the backrest angle position is tilted to the rear side of the seat from the position where the seat back is vertically raised, the operation of the operation lever 5 described above is stopped. The backrest angle is returned to the fixed state (locked state), but even if the operation of the operation lever 5 is stopped by entering the angle region of the forward leaning posture tilted forward from the standing position to the seat front side. The backrest angle is not fixed.

  The angle region in which the former backrest angle is returned to the fixed state is formed by the rotation region of the lock zone set in each reclining device 4 to be described later, and the angle region in which the latter backrest angle is not returned to the fixed state is These are formed by a free zone rotation region set in each reclining device 4 to be described later. By setting the free zone, the operating lever 5 is operated in a state where no person is sitting on the vehicle seat 1, and the seat back 2 is pushed down to the front side of the seat by the urging force of the spiral spring 6. Sometimes, when the seat back 2 is pushed down to a position exceeding the above-mentioned standing position, the seat back 2 is greatly moved forward to the position where the seat back 2 is folded into the upper surface of the seat cushion 3 even if the operation lever 5 is released. It is supposed to be defeated.

  By the way, as shown in FIG. 1, the connecting rod 7 described above is formed of a straight circular steel pipe, and the left and right ends of the connecting rod 7 are respectively axial with respect to the operation shaft 4c described above. It is configured to be firmly and integrally joined by welding. By this connection, the connecting rod 7 is in a state where the operation shafts 4c are connected to each other so that power can be transmitted to each other. Specifically, the connecting rod 7 is coupled to each of the operation shafts 4c described above in a state in which the shaft centers 7r are in a positional relationship that is eccentric rearward and lower than the shaft center 4r of each operation shaft 4c. .

  Specifically, as shown in FIGS. 1 and 3, each end portion of the connecting rod 7 described above is formed from a disk-shaped flange portion 4 c 1 formed at the inner end portion in the axial direction of each operation shaft 4 c. A state in which the flange portion 4c1 is integrally coupled to each flange portion 4c1 by being fitted into each columnar head portion 4c2 protruding in the axial direction and abutted against each flange portion 4c1 in the axial direction. Each of the disk-shaped flange portions 4c1 described above is formed at a position eccentric to the rear lower side with respect to each operation shaft 4c, and each head 4c2 protruding from the center portion of these flange portions 4c1 is eccentric. By being in the state formed at the position, the connecting rod 7 fitted to each head 4c2 is placed at the eccentric position. The effect of this eccentric arrangement will be described in detail later.

  The connecting rod 7 described above has a larger diameter than the operation shafts 4c, and is positioned between the side frames of the seat back frame 2f, which will be described later. The frame functions as a reinforcing member that prevents deformation movement that is crushed toward the side frame inside the vehicle.

  The connecting rod 7 is always in an initial rotational position state in which each operation shaft 4c locks each reclining device 4 by urging before the operation lever 5 described above with reference to FIG. Stopped and held. In this state, both the operation shaft 4c and the connecting rod 7 can rotate in the direction of rotation by rotating the operation lever 5 (clockwise direction in FIG. 3), but in the opposite direction, the lock It is in a state where it cannot rotate due to regulation by Therefore, the connecting rod 7 transmits, to the other operation shaft 4c, the movement of turning the operation shaft 4c on the side where the operation lever 5 is set when the operation lever 5 is pulled up. Thus, the locked state of the reclining devices 4 on both sides is released simultaneously.

  In this case, the connecting rod 7 described above is normally attached to the back of the seated occupant by a cushion pad (not shown) interposed between the seat back 2 and the back of the seated occupant. It is in a state of being protected so that it does not come into direct contact with. However, even in the above-described configuration, as shown in FIG. 4, when a heavy load is applied such that the back of the vehicle occupies the seat back 2 due to a rear collision of the vehicle, The connecting rod 7 may be subjected to a pressing force accompanying a backward movement from the back (waist) of the seated occupant.

  This pressing force is applied mainly by interference with the lower back as the entire back of the seated occupant sinks into the seat back 2, but the back of the seated occupant sinks backward. Along with this, the connecting rod 7 is not simply pressed rearward, but exerts an acting force that rubs the outer peripheral surface (front surface) of the connecting rod 7 upward. The force with which the outer peripheral surface (front surface) of the connecting rod 7 is rubbed upward becomes a force that causes the connecting rod 7 to rotate in the release operation direction, and this force causes the connecting rod 7 to rotate in the release operation direction. As a result, the locked state of each reclining device 4 is released.

  However, the connecting rod 7 of the present embodiment is configured not to rotate in the release operation direction even when subjected to the action of the pressing force as described above, and can keep each reclining device 4 in the locked state. Yes. Specifically, the configuration in which the connecting rod 7 is not rotated in the release operation direction is generally lower and lower than the normal connection position (the phantom line position in FIG. 2) where the operation rods 4 c are normally connected to each other. This is done by being set at an eccentric position.

  That is, as shown in FIG. 4, when the connecting rod 7 is arranged at the eccentric position, the position of the interference point P of the connecting rod 7 that interferes when the back of the seated occupant moves backward is normally The position is set closer to the axial center 4r of each operation shaft 4c than the general position (interference point Pv) defined by the outer peripheral shape of the connecting rod 7 connecting the operation shafts 4c. Thereby, at the time of the interference, the rotational torque that the interference point P is rubbed in the upward rotation direction and rotated in the release operation direction is reduced, and the connecting rod 7 is not easily rotated in the release operation direction.

  Specifically, the movement of the seated occupant's back moving backward when the rear collision of the vehicle described above occurs is specifically performed in a manner in which the back is tilted backward about the waist and is close to the seated occupant's waist It interferes with the connecting rod 7 set at the height position from an obliquely upper angle. Therefore, the arrangement position of the connecting rod 7 having an annular cross section is lowered downward from the normal setting position, so that the distance to the axis center 4r of the interference point P is reduced, and the position of the interference point P is reduced. The state is brought closer to the axis center 4r. Further, even when the position where the connecting rod 7 is disposed is shifted rearward from the normal setting position, the distance to the axis center 4r of the interference point P is reduced, and the position of the interference point P is brought closer to the axis center 4r. It will be in the state. Therefore, by shifting the connecting rod 7 from the normal setting position to the lower rear oblique side so that the interference point P can be straightly approached toward the axis center 4r, the distance between the interference point P and the axis center 4r can be reduced. The distance is effectively shortened, and the position of the interference point P is effectively brought closer to the axis center 4r with a smaller movement set distance.

  In this way, by setting the position of the interference point P of the connecting rod 7 close to the axial center 4r of each operation shaft 4c, the interference point P is rubbed in the release operation direction due to interference with the back of the seated occupant. Rotating torque that is rotated can be reduced. Thereby, it is possible to prevent the connecting rod 7 from being turned in the release operation direction due to interference with the back of the seated occupant.

  Hereinafter, the configuration of each reclining device 4 described above will be described in detail. Since each reclining device 4 has the same configuration that is bilaterally symmetric, in the following, as a representative of these, the reclining device 4 of the reclining device 4 that is arranged on the right side of the paper surface of FIG. Only the configuration will be described. As shown in FIG. 5, the reclining device 4 includes a disk-shaped ratchet 10 and guide 20, two poles 30, a slide cam 40, a hinge cam 50, a spiral spring 60, and an outer ring 70. These are assembled together in the axial direction.

  In the ratchet 10, a cylindrical portion 12 that protrudes in a cylindrical shape in the plate thickness direction (axial direction), which is an assembly direction to the guide 20, is formed on the outer peripheral portion of the disk portion 11. The cylindrical portion 12 is formed by being extruded by half-cutting the outer peripheral portion of the disc portion 11 in the plate thickness direction. The inner circumferential surface of the cylindrical portion 12 has an inner circumferential tooth surface 12a having inner teeth that can mesh with outer circumferential tooth surfaces 30a of the respective poles 30 described later, and a smooth arc surface with no inner teeth. The protruding riding surface 12b is formed side by side in the circumferential direction. The ride-up surface 12b is formed at one position on the inner peripheral surface of the cylindrical portion 12 in the circumferential direction, and the inner peripheral surface is on the inner side in the radial direction than the tooth tip of the inner peripheral tooth surface 12a. It is formed as a protruding arc surface.

  As shown in FIG. 6, the ratchet 10 has an outer disk surface of the disk portion 11 joined to an outer plate surface of the seat back frame 2f and integrally coupled thereto. Specifically, the disc portion 11 of the ratchet 10 is formed with five dowels 13a (... indicates a plurality) and one D dowel 13b projecting in a cylindrical shape from the outer disc surface. . These dowels 13a... And D dowels 13b are arranged and formed at equal intervals in the circumferential direction at positions relatively close to the outer peripheral edge side of the disk portion 11. Among these, the D dowel 13b is formed in a shape in which a part of the protruding cylindrical shape is cut out in a D-shaped cross section so that the shape can be distinguished from each dowel 13a. It has become.

  On the other hand, in the seat back frame 2f, the above-mentioned dowels 13a, .. and D dowels 13b can be respectively fitted in the axial direction. Is formed. As a result, the ratchet 10 fits the dowels 13a... And D dowels 13b into the respective dowel holes 2a... And D dowel holes 2b formed in the seat back frame 2f. By being welded and joined to each other, the seat back frame 2f is firmly and integrally joined. Here, as shown in FIG. 5, the operation shaft 4 c (see FIG. 3) for performing the lock / unlock switching operation of the reclining device 4 is inserted into the central portion of the disk portion 11 of the ratchet 10 described above. For this purpose, a through hole 14 is formed. As shown in FIG. 6, a through hole 2c having the same purpose is formed through the seat back frame 2f at a position coaxial with the through hole 14.

  Next, the configuration of the guide 20 will be described with reference to FIG. The guide 20 is formed in a disk shape having an outer diameter slightly larger than that of the ratchet 10 described above, and a plate thickness direction (axial direction) that is an assembling direction to the ratchet 10 is formed on the outer peripheral portion of the disk portion 21. A cylindrical portion 22 protruding in a cylindrical shape is formed. The cylindrical portion 22 is formed by being extruded by half-cutting the outer peripheral portion of the disc portion 21 in the plate thickness direction. The inner diameter of the cylindrical portion 22 is slightly larger than the outer diameter of the cylindrical portion 12 of the ratchet 10, and as shown in FIG. 3, the cylindrical portion 12 of the ratchet 10 is fitted in the inside of the cylinder in the axial direction. As a result of the assembly, the cylindrical portions 12 are loosely fitted in and out of each other, and the ratchet 10 and the guide 20 are assembled in a state of supporting each other so that they can rotate relative to each other. ing.

  Guide walls 21 a, 21 b, 21 c, 21 d (hereinafter referred to as guide walls 21 a to 21 b) projecting in the plate thickness direction as the assembly direction to the ratchet 10 are arranged at four positions on the disk portion 21 of the guide 20 in the circumferential direction. 21d) is formed. These guide walls 21a to 21d are formed by being extruded by partially punching part of the disk portion 21 in the plate thickness direction. As shown in FIGS. 8 to 9, these guide walls 21 a to 21 d can move the poles 30 set at two positions on the disk portion 21 described later only inward and outward in the radial direction. The slide cam 40 set in the center of the disk portion 21 is supported so as to be movable only in the radial direction perpendicular to the slide direction of the poles 30. It is the structure which supports to direction.

  As shown in FIG. 7, the outer surface of the disk portion 21 of the guide 20 is joined to the inner surface of the seat cushion frame 3 f so as to be integrally coupled. Specifically, the disc portion 21 of the guide 20 is formed with three dowels 24a... Projecting in a cylindrical shape from the outer surface of the guide 20 and one D dowel 24b. These dowels 24a,... And D dowels 24b are formed one by one on the outer surface of the guide groove 23 formed in the shape of a "ten" sign projecting on the outer surface of the disk portion 21, which will be described later. Thus, they are formed in a state of being arranged at equal intervals in the circumferential direction. Among them, the D dowel 24b is formed in a shape in which a part of the protruding cylindrical shape is cut out in a D-shaped cross section so that the shape can be distinguished from each of the dowels 24a. It has become. Further, two spring hook portions 24c are formed on the outer surface of the guide 20 so as to protrude into a pin shape for hooking an outer end 62 of a spiral spring 60 described later. The two spring hooks 24c are formed so that the same configuration can be applied to the reclining device 4 on the other side where the spiral spring 60 is hooked in the opposite direction.

  On the other hand, the dowel holes 3a and D dowel holes 3b through which the above-described dowels 24a and D dowels 24b can be fitted in the axial direction are formed through the cushion frame 3f in the thickness direction. Has been. Thereby, the above-described guide 20 fits the dowels 24a... And the D dowels 24b into the dowel holes 3a... And the D dowel holes 3b formed in the cushion frame 3f. By being welded and joined to each other, the cushion frame 3f is firmly and integrally joined. Here, as shown in FIG. 5, the operation shaft 4 c (see FIG. 3) for performing the switching operation of the reclining device 4 is inserted into the center portion of the disk portion 21 of the guide 20 described above. For this purpose, a through hole 25 is formed. The seat cushion frame 3f is also formed with a through hole 3c having the same purpose passing through at a position coaxial with the through hole 25. The through-hole 3c is formed so as to open to a size that allows a spiral spring 60 (described later) to pass through the cut-and-raised plate 3d. A lid member 3g that covers the through hole 3c from the outside is provided on the plate surface portion outside the through hole 3c.

  Referring to FIG. 5, a guide groove 23 is formed in the disk portion 21 of the guide 20 described above on the inner surface of the guide 20 so as to be recessed in a “ten” sign shape in the plate thickness direction. The guide groove 23 is formed by half-cutting the disk portion 21 into a “ten” symbol shape in the plate thickness direction, and the four corners of the portion where the groove shape crosses, that is, between the grooves projecting in the radial direction. In the region portion, the above-described guide walls 21a to 21d are formed so as to protrude in a standing wall shape in the plate thickness direction. Of the groove shape recessed in the “ten” symbol shape, the guide groove 23 described above has two groove portions extending from the center portion of the guide 20 to the upper side and the lower side in the figure, respectively. Each of them is formed as a pole groove 23a that can be accommodated therein so as to be movable inward and outward in the radial direction.

  Similarly, of the groove shape of the guide groove 23 recessed in a “ten” symbol shape, a groove portion formed by communicating the center portion of the guide 20 with two groove portions extending in the horizontal direction in the drawing is a slide described later. The cam 40 is formed as a cam groove 23b that can be accommodated therein so as to be movable in the horizontal direction (radial direction) in the figure. The guide walls 21a to 21d described above are respectively assigned to the side surfaces of the poles 30 accommodated in the pole grooves 23a and the side surfaces of the slide cams 40 accommodated in the cam grooves 23b. The pole 30 and the slide cam 40 are each guided so as to be movable only in a specific radial direction.

  Next, the configuration of each pole 30 described above will be described with reference to FIG. Each pole 30 is set in each pole groove 23a formed in the guide 20 described above, so that it can move only inward and outward in the radial direction along the shape in each pole groove 23a. It is arrange | positioned as the state supported in the direction. Each of the poles 30 is formed as an outer peripheral tooth surface 30a having curved outer teeth so that the outer peripheral surface thereof can mesh with the inner peripheral tooth surface 12a of the cylindrical portion 12 of the ratchet 10 described above. Is formed.

  As shown in FIG. 8, each of the poles 30 is pushed outward in the radial direction by a slide operation of a slide cam 40 to be described later, so that the outer peripheral tooth surfaces 30 a are the inner peripheral tooth surfaces of the cylindrical portion 12 of the ratchet 10. 12a is engaged. As a result, each pole 30 is integrally pressed in the rotational direction (circumferential direction) with respect to the ratchet 10 as being pressed against the inner peripheral tooth surface 12a of the ratchet 10 by the pressing force of the slide cam 40. It is held in a state.

  Each of the poles 30 can slide only inward and outward in the radial direction by the support in the circumferential direction by the guide walls 21a to 21d described above in relation to the guide 20. Accordingly, the ratchet 10 is in a state in which the respective poles 30 are engaged with each other, so that the ratchet 10 is integrated with the guide 20 through the poles 30 in the rotational direction, that is, the rotation with respect to the guide 20 is locked. Is held. As a result, the reclining device 4 is rotationally locked. Here, the structure in which the pawls 30 are engaged with the ratchet 10 to lock the rotation corresponds to the “lock mechanism” of the present invention.

  As shown in FIG. 9, the rotation lock state of the reclining device 4 is removed from the meshed state with the ratchet 10 when the slide cam 40 is slid in the right direction in the drawing and each pole 30 is drawn inward in the radial direction. It is to be canceled by being done. Here, as shown in FIG. 5, the above-described operations for pushing each of the poles 30 outward in the radial direction by the sliding motion of the slide cam 40 and pulling them inward in the radial direction are performed on the peripheral edges on the upper and lower sides of the slide cam 40. This is performed by the shoulders 42 and hooks 44 formed in the part.

  Specifically, as shown in FIG. 8, each of the shoulder portions 42 is configured so that the slide cam 40 slides in the left direction in the drawing (sliding movement from the state of FIG. 9 to the state of FIG. 8). Each leg 32 is pushed up from the inside in the radial direction to the outside so as to ride on each leg 32, and each pole 30 is engaged with the inner peripheral tooth surface 12 a of the ratchet 10. Further, the hook 44 is formed in an arm shape so as to bend in the right direction in the figure from the upper and lower outer peripheral portions of the slide cam 40, and the slide cam 40 slides in the right direction in the figure (see FIG. (Sliding movement from the state of 8 to the state of FIG. 9), it is hooked on each hooking portion 31 formed on the inner peripheral portion of each pole 30, and pulls each pole 30 inward in the radial direction. Each of the poles 30 is removed from the meshed state with the inner peripheral tooth surface 12a of the ratchet 10. Here, the movement of the respective poles 30 inward in the radial direction is allowed by the structure in which the leg portions 32 enter into the respective groove portions 43 formed in the periphery of the upper and lower sides of the slide cam 40. It has become.

  As shown in FIG. 8, the slide cam 40 is normally moved and urged to the left in the drawing via a hinge cam 50 mounted in the through hole 41 at the center thereof, and each pole 30 is moved. Pressed from the inner side in the radial direction and pressed against the inner peripheral tooth surface 12a of the ratchet 10 to be held in mesh. Then, as shown in FIG. 9, the slide cam 40 is pushed rightward in the figure by rotating the hinge cam 50 in the clockwise direction in the figure against the urging force, so that each pole 30 is moved. It is drawn inward in the radial direction and removed from the meshed state with the ratchet 10.

  By the way, when each of the above-described poles 30 is in a state where the rotation position of the ratchet 10 with respect to the guide 20 is in a state where the riding surface 12b is located at the position to which any of the poles 30 is moved, the locking movement is performed. It is blocked by climbing onto the door and cannot be locked. Specifically, when any one of the above-mentioned poles 30 rides on the riding surface 12b, the movement of the slide cam 40 that applies a pressing force in the pushing direction to each pole 30 is stopped. Thereby, the locking operation of the other pole 30 is also stopped, and the reclining device 4 is kept in the unlocked state. As described above, in the rotation angle region where the above-described riding surface 12b interferes with any one of the poles 30, the locking operation of the reclining device 4 is prevented, and the reclining device 4 is kept in the unlocked state. This rotation angle region is set as the rotation angle region constituting the above-described free zone. Further, the reclining device 4 is returned to the locked state in the rotation angle region in which each of the poles 30 can mesh with the inner peripheral tooth surface 12a of the ratchet 10 without the riding surface 12b interfering with any of the poles 30. It is set as a lock zone.

  Next, the configuration of the hinge cam 50 that rotates the slide cam 40 described above will be described with reference to FIG. The hinge cam 50 is inserted into a through-hole 25 formed in the central portion of the guide 20 described above and is rotatably supported so as to protrude in the axial direction of the shaft portion and the outer peripheral portion of the shaft portion. The formed operation protrusion 52 is set in a state of being fitted into a through hole 41 formed through the central portion of the slide cam 40. Specifically, the hinge cam 50 is set in a state in which the operation projection 52 is inserted into the operation hole 41 a that is formed in a part of the peripheral edge in the through hole 41 of the slide cam 40.

  The hinge cam 50 is normally urged to rotate in the clockwise direction with respect to the guide 20 in FIG. 5 by the urging force of the spiral spring 60 hooked between the hinge cam 50 and the guide 20. Yes. As a result, the hinge cam 50 normally applies a rotational biasing force in the same direction (clockwise direction toward the paper surface of FIG. 5) to the slide cam 40 via the operation projection 52. As shown in FIG. 7, the spiral spring 60 is twisted in advance, and an inner end 61 thereof is hooked on a spring hook portion 51 formed in a rectangular tube shape of the hinge cam 50, and an outer end 62. Is provided by being hooked to the spring hooking portion 24c of the guide 20. The operation shaft 4c described above with reference to FIG. 5 is inserted into the hinge cam 50 in the axial direction and is integrally mounted in the rotational direction. As a result, the hinge cam 50 is rotated in the counterclockwise direction in the figure against the urging force of the spiral spring 60 shown in FIG. 5 as the operation lever 5 described above with reference to FIG. 5 is pulled up. It has become.

  Next, the configuration of the outer peripheral ring 70 will be described with reference to FIG. The outer peripheral ring 70 has a surface oriented in the axial direction by punching a thin steel plate into a ring shape and further punching the punched disc portion into a step shape in the plate thickness direction (axial direction). The ring-shaped first seat surface portion 71 and the second seat surface portion 72 are formed in a cylindrical shape with a seat, which is formed side by side in steps in the axial direction. A cylindrical portion 73 protruding in a cylindrical shape in the axial direction is formed on the outer peripheral portion of the outer peripheral ring 70.

  The outer peripheral ring 70 has the ratchet 10 and the guide 20 assembled in order inside the cylinder, so that the cylindrical portion 12 of the ratchet 10 is assigned from the outside in the axial direction by the first seat surface portion 71 described above. The cylindrical portion 22 of the guide 20 is covered with the cylindrical portion 73 from the outer peripheral side, with the cylindrical portion 22 of the guide 20 being applied from the inner side in the axial direction by the two seating surface portions 72. Then, after the assembly, the tip of the cylindrical portion 73 (caulking portion 73a) that protrudes outward in the axial direction from the cylindrical portion 22 of the guide 20 of the outer peripheral ring 70 is bent inward in the radial direction, so that the second seat surface portion 72 is obtained. The outer peripheral ring 70 is assembled in a state of being integrally coupled to the cylindrical portion 22 of the guide 20 by caulking the cylindrical portion 22 of the guide 20 in the axial direction therebetween. By this assembly, the outer peripheral ring 70 is in a state in which the ratchet 10 and the guide 20 are assembled in the axial direction, with the first seat surface portion 71 holding the ratchet 10 so as not to be detached from the guide 20 in the axial direction. It comes to hold.

  Thus, according to the configuration of the vehicle seat 1 of the present embodiment, the position of the interference point P of the connecting rod 7 is set close to the axis center 4r of each operation shaft 4c, whereby the interference point P is set. It is possible to reduce the rotational torque that is rubbed in the rotational direction and rotated in the release operation direction upon interference with the back of the seated occupant. Specifically, the connecting rod 7 is shifted in the height direction (downward direction) and the rear side so that the position of the interference point P is inclined obliquely in the radial direction toward the axial center 4r of each operation shaft 4c. The point P is effectively brought close to the shaft center 4r of each operation shaft 4c. Therefore, the rotational torque applied at the time of interference can be effectively reduced, and the situation where the connecting rod 7 is turned in the release operation direction due to interference with the back of the seated occupant can be effectively prevented. Further, even if the connecting rod 7 has a thick structure that functions as a reinforcing member as in the present embodiment, it is possible to reduce the rotational torque by moving the position of the interference point P of the connecting rod 7 closer to the shaft center 4r. It is possible to prevent the rod 7 from being turned in the release operation direction due to interference with the back of the seated occupant.

  Then, the structure of the vehicle seat 1 of Example 2 is demonstrated using FIGS. In addition, in a present Example, about the location which becomes the substantially same structure and effect | action as the vehicle seat 1 shown in Example 1, the same code | symbol is attached | subjected to these, description is abbreviate | omitted, and a different structure is explained in detail. I will explain. In this embodiment, as shown in each drawing, the connecting rod 7 is fitted to each head 4c2 set at a position coaxial with each operation shaft 4c, and at a position coaxial with each operation shaft 4c. The center front part that interferes with the back of the seated occupant who leaves both ends of the structure is arranged in a semicircular shape with a circular cross section recessed from the upper front to the lower rear. The cross-sectional shape is formed.

  As described above, the position of the interference point P of the connecting rod 7 that interferes when the back of the seated occupant moves backward is formed by forming the connecting rod 7 in the shape of a concave half-moon. However, it is usually set closer to the axis center 4r of each operation shaft 4c than the general position (interference point Pv) defined by the outer peripheral shape of the connecting rod 7 connecting the operation shafts 4c. Thereby, at the time of the interference, the rotational torque that the interference point P is rubbed in the upward rotation direction and rotated in the release operation direction is reduced, and the connecting rod 7 is not easily rotated in the release operation direction.

  In this way, the position of the interference point P of the connecting rod 7 is also set close to the axial center 4r of each operation shaft 4c by depressing the shape of the connecting rod 7, and the interference point P is the back of the seated occupant. Rotational torque that is rubbed in the rotational direction and rotated in the release operation direction at the time of interference can be reduced.

  As mentioned above, although embodiment of this invention was described using two Examples, this invention can be implemented with various forms other than the said Example. For example, the connecting rod 7 does not have to have a large-diameter structure that functions as a reinforcing member as shown in the above-described embodiment, and simply connects the operating shafts in a state where power can be transmitted between them. It may be of a small diameter with strength. Further, in order to bring the position of the interference point of the connecting rod closer to the axis center of each operation shaft, the configuration in which the shape of the connecting rod is changed or the arrangement position is shifted at least interferes with the back of the seated occupant in the connecting rod. It only needs to be set in the central portion, and the shape and arrangement position of the entire connecting rod need not necessarily be changed. Further, the connecting rod can be applied in various polygonal shapes such as a triangular shape and a quadrangular shape in addition to the circular cross section shown in the above embodiments.

  Further, in the first embodiment, the example in which the position of the interference point P is brought closer to the axis center 4r of each operation shaft 4c by shifting the arrangement position of the connecting rod 7 rearward and obliquely below the normal position is illustrated. However, the same effect can be obtained even if the configuration is shifted only downward or only backward. However, as shown in the first embodiment, it is possible to effectively bring the position of the interference point closer to the axis center of each operation axis by shifting obliquely. Further, the position of the interference point may be set so as to be shifted to a position exceeding the position of the axis center of each operation axis.

  In each of the above embodiments, the release operation direction of the connecting rod 7 is set as the direction in which the operation lever 5 is pulled up. However, the direction in which the operation lever 5 is pushed down is the release operation direction. The configuration of the present invention can also be applied. Specifically, the structure of the connecting rod shown in each of the above embodiments is arranged in the upside down direction, so that an erroneous operation preventing structure can be configured when the release operation direction is reversed. In this case, the connecting rod is applied even if an acting force such that the back of the seated occupant interferes with the interference portion of the connecting rod and is rubbed upward by the occurrence of a rear collision of the vehicle. Is not rotated in the release operation direction, but when the back of the seated occupant moves backward due to some action, the rear side is accompanied by a downward rubbing force that is pushed by the connecting rod in the release operation direction. When the pressing force is applied to the connecting rod, it is possible to prevent the connecting rod from being turned in the releasing operation direction.

  Further, in each of the above embodiments, the reclining device 4 that functions as a rotation shaft device that can be prevented from rotating is illustrated as a locking device that fixes the backrest angle of the seat back 2. However, the rotation that pivotally supports the seat back is supported. The shaft portion and the locking device that locks the backrest angle of the seat back may be configured separately. Further, the connecting rod may be provided between the locking devices so as to function so as to release these locked states all at once, and is inserted into each reclining device 4 as shown in the above embodiments. In addition to the configuration in which the set operation shafts 4c are connected to each other, the connecting rod is directly connected to the rotary shaft member set in each lock device, and the lock state of each lock device is simultaneously released. It may function as follows. In this case, the rotation shaft member in each lock device corresponds to the “operation shaft” of the present invention. Moreover, although the configuration in which the seat back 2 is connected to and supported by the seat cushion 3 is illustrated, the seat back may be connected to and supported by the floor.

DESCRIPTION OF SYMBOLS 1 Vehicle seat 2 Seat back 2f Seat back frame 2a Dowel hole 2b D Dowel hole 2c Through hole 2d L-shaped plate 3 Seat cushion 3f Seat cushion frame 3a Dowel hole 3b D Dowel hole 3c Through hole 3d Cut and raise plate 3g Cover member 4 Reclining device (lock device)
4c Operation shaft 4c1 Flange 4c2 Head 4r Shaft center 5 Operation lever 6 Spiral spring 6a Inner end 6b Outer end 7 Connecting rod 7r Shaft center 10 Ratchet 11 Disc part 12 Cylindrical part 12a Inner peripheral tooth surface 12b Raised surface 13a Dowel 13b D dowel 14 through-hole 20 guide 21 disk part 21a-21d guide wall 22 cylindrical part 23 guide groove 23a pole groove 23b cam groove 24a dowel 24b D dowel 24c spring hook part 25 through hole 30 pole 30a outer peripheral tooth surface 31 hook part 32 leg Part 40 Slide cam 41 Through hole 41a Operation hole part 42 Shoulder part 43 Groove part 44 Hook 50 Hinge cam 51 Spring hook part 52 Operation protrusion 60 Spiral spring 61 Inner end 62 Outer end 70 Outer peripheral ring 71 First seat part 72 Second seat part 73 Cylindrical part 73a Caulking part 74 Step part Interference point Pv interference point (generally the position)

Claims (3)

Locking devices for locking the backrest angle of the seat back are provided on both right and left sides of the seat back, and connecting rods serving as power transmission members for simultaneously releasing the lock state between the lock devices are provided. A vehicle seat extending in an axial direction,
Each of the locking devices is configured such that the respective locked states are released by rotating the operation shafts set in positions on the coaxial lines in the release operation direction.
The connecting rod connects the operation shafts in a state in which power can be transmitted to each other.
The position of the interference point that interferes when the back of the seated occupant of the connecting rod moves backward is eccentric in such a way that the connecting rod maintains a uniform cross-sectional shape on the rear side with respect to the axial center of each operating shaft. With this configuration , the vehicle is characterized in that the rotational torque that is brought closer to the axis center of each operation shaft and is rubbed in the rotation direction at the time of interference and rotated in the release operation direction is reduced . Sheet. The vehicle seat according to claim 1,
Since the connecting rod is also eccentrically provided in the height direction with respect to the axis center of each operation shaft, the position of the interference point of the connecting rod is brought closer to the radial direction toward the axis center of each operation shaft. A vehicle seat characterized by the above . The vehicle seat according to claim 1 or 2,
The connecting rod is thicker than each operation shaft, and is configured as a reinforcing member that is located between both side frames of the seat back and prevents deformation movement in the approaching direction between the side frames. Vehicle seat to be used.

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