JP5467912B2 - Vehicle seat reclining device - Google Patents

Description

  The present invention relates to a vehicle seat reclining device, which is designed to increase the strength by suppressing the occurrence of sagging when the lid is formed by half extraction.

  The vehicle is provided with a seat, and a seat reclining device for a vehicle is provided on the seat so that the seat back can be rotated with respect to the seat cushion and fixed at an arbitrary position.

  The vehicle seat reclining device includes: a base member coupled to one of a seat cushion and a seat back provided to be rotatable with respect to the seat cushion; and a base member coupled to the other and the base member And a rotation member having an internal gear and a lock tooth having an external gear provided on the base member and capable of meshing with the internal gear. The rotating member is formed in a tray shape comprising a cylindrical portion, a disc portion, and a connecting portion connecting them by forming a circular recess by half-cutting the disk, and is formed on the inner peripheral surface of the cylindrical portion. At the same time, an internal gear is formed. In order to reduce the weight of the rotating member, a thin disk is used, and in order to increase the meshing strength, the tooth width of the internal gear is desired to be increased. Therefore, the extraction depth for half extraction is increased. In this case, since the strength is small when the thickness dimension of the connecting portion is small, a ring having a conical outer peripheral surface by connecting the end surface on the inner peripheral side of the cylindrical portion and the outer peripheral surface on the cylindrical portion side of the disc portion. The connection part of the shape is provided.

  As a conventional vehicle seat reclining device, for example, there is a reclining mechanism described in Patent Document 1. This is because half-punching is performed by matching the position of the outer peripheral surface of the disc portion of the ratchet 130 corresponding to the rotating member with the position of the pitch circle of the inner teeth 133 formed on the inner peripheral surface of the cylindrical portion. In addition, when the half punching process is performed, the meat obtained by forming the root of the inner tooth 133 is used for forming the tooth tip.

JP 2004-49771 A

  However, when the connection portion as described above is provided, the meat moves from the inner peripheral portion of the cylindrical portion toward the connection portion when performing the half-punching process. It flows toward the disc part and sagging occurs on the opening side end face. For this reason, the formation of the internal gear on the opening side end face of the cylindrical portion is incomplete, the effective tooth width is reduced, and the meshing strength with the external gear of the lock tooth is reduced.

  Accordingly, an object of the present invention is to provide a vehicle seat reclining device that solves the above-described problems, suppresses sagging, and maintains the strength of a connecting portion.

  The invention according to claim 1 is a base member coupled to one of a seat cushion and a seat back rotatable with respect to the seat cushion, and coupled to the other and rotated relative to the base member. A rotating member having a circular recess formed by freely punching the disk and having an internal gear formed on the inner peripheral surface of the circular recess, and an external gear meshable with the internal gear. A lock tooth movably provided through a guide portion formed on the base member in a direction in which an external gear engages with and disengages from the internal gear, and the rotating member is disposed on an outer peripheral side of the circular recess. A cylindrical portion in which the internal gear is formed on the inner peripheral surface, a disc portion forming the bottom surface of the circular recess, and an inner peripheral side of the cylindrical portion that is in a substantially perpendicular positional relationship with each other End surface and outer peripheral surface of the disc portion on the cylindrical portion side In the vehicle seat reclining device formed by the ring-shaped connecting portion for connecting the ring-shaped connecting portion, the ring-shaped connecting portion is formed on the disk portion side and has a substantially uniform cross-sectional thickness and an outer peripheral surface. An arc-shaped portion having an arc shape, and an outer peripheral surface formed continuously with the outer peripheral surface of the arc-shaped portion, and a linear shape portion having a linear shape, the linear shape portion having a predetermined shape with respect to the end surface of the cylindrical portion It is characterized by being inclined by an angle.

  According to the present invention, since the ring-shaped connecting portion has an arc shape with a substantially uniform thickness on the disk portion side, the ring-shaped connecting portion is used for forming the connecting portion as compared with the case where the outer peripheral surface is a linear shape. The amount is minimal. On the other hand, since the strength of the connecting portion is not different from the conventional one, there is no problem with the strength.

  According to a second aspect of the present invention, in the vehicle seat reclining device according to the first aspect, the arc-shaped portion has an inner peripheral surface connecting the tooth bottom of the internal gear and the bottom surface of the disc portion with an arc. It has an arc shape and is characterized by an arc shape centered on a point whose outer peripheral surface substantially coincides with the center of the arc.

  According to the present invention, the thickness of the arc-shaped portion in the connecting portion is substantially the same at any position, and the strength of the arc-shaped portion is approximately the same at any position.

  According to a third aspect of the present invention, in the vehicle seat reclining device according to the first or second aspect, the internal gear formed on the inner peripheral surface of the cylindrical portion with a radial dimension of the outer peripheral surface of the disc portion. It is characterized by being substantially the same as the radial dimension of the tooth tip circle.

  According to the present invention, the radial dimension of the outer peripheral surface of the disc part is made substantially the same as the radial dimension of the tip circle of the internal gear formed on the inner peripheral surface of the cylindrical part, and therefore it is caused by the formation of the internal gear. The meat is used as the meat used to form the connection.

  According to the vehicle seat reclining device of the first aspect, since the shape of the ring-shaped connecting portion on the disk portion side is an arc shape having a substantially uniform thickness, the amount of meat used for forming the connecting portion is the minimum necessary. Since the amount of meat is smaller than that of a straight shape, the amount of meat drawn from the inner peripheral portion of the cylindrical portion to the connecting portion is reduced, and the opening portion side of the cylindrical portion is correspondingly reduced. The occurrence of sagging of the end face can be suppressed. Thereby, the effective tooth width of the internal gear can be increased, and the meshing strength with the external tooth of the lock tooth can be improved.

  According to the vehicle seat reclining device of the second aspect, since the inner peripheral surface and the outer peripheral surface of the arc-shaped portion have the arc shape having the center at substantially the same position, the cross-sectional thickness can be formed substantially uniform. it can. Thereby, the amount of meat required for forming the arc-shaped portion can be minimized. Also, for example, when half-cutting to the same depth as the disk thickness, the cross-sectional thickness of the arc-shaped part is the thinnest and becomes a weakened part, but the arc-shaped part is formed on the disk part side. Therefore, the thickness of the arc-shaped portion can be easily managed with the half punching depth.

  According to the vehicle seat reclining device of the third aspect, since the meat generated by the formation of the internal gear is used as the meat of the connecting portion, the amount of meat drawn into the connecting portion from the inner peripheral portion of the cylindrical portion is reduced. It is possible to reduce the occurrence of sagging by as much as possible. That is, it is possible to suppress the occurrence of sagging from two directions by adopting a configuration that reduces the demand for meat for forming the connecting portion and a configuration that supplies a part of the meat from the other.

The enlarged view which shows the principal part of a cover body. The principle figure for demonstrating the principle of invention. (A) is sectional drawing of the principal part at the time of making all the cross-sectional shape of the outer peripheral surface of a connection part into linear shape, (b) is the principal part at the time of thickening plate | board thickness in (a) and making half-punch depth shallow. FIG. (A) is sectional drawing of the principal part at the time of making all the cross-sectional shape of the outer peripheral surface of a connection part into circular arc shape, (b) is the principal part at the time of thickening plate | board thickness in (a) and making half-punch depth shallow. FIG. (A) is sectional drawing of the principal part at the time of making circular part on the circular part side while making circular part on the circular part side among the cross-sectional shape of the outer peripheral surface of a connection part, (b) is (a). Sectional drawing of the principal part at the time of thickening plate | board thickness and shallowing the half punching depth in FIG. FIG. 2 is a structural view showing a lid reclining device for a vehicle, wherein FIG. FIG. 7 is an enlarged cross-sectional view illustrating a part of FIG. The disassembled perspective view of the seat reclining apparatus for vehicles. The block diagram of a vehicle seat.

Hereinafter, embodiments of a vehicle seat reclining device according to the present invention will be described.
(Constitution)
As shown in FIG. 9, a seat cushion 2 that is a sitting portion is provided, and a seat back 3 is attached to the seat cushion 2 so as to be rotatable in the front-rear direction of the vehicle. A machine frame (fixing member) 5 is coupled to the seat cushion 2 side via a base bracket 4, while a lid (rotating member) 7 is coupled to the seat back 3 side via an arm bracket 6. . A spring (not shown) that biases the seat back 3 toward the left side, which is the front of the vehicle, is provided with respect to the seat cushion 2.

  The machine frame 5 and the lid body 7 constitute a vehicle seat reclining device 1 shown in FIG. The vehicle seat reclining device 1 will be described below. As shown in FIG. 6B, the machine frame 5 has a circular recess 5a formed by half-cutting the inside of the disk by pressing, while the lid body 7 is also half-cut by pressing the inside of the disk. 7c is formed, thereby forming a cylindrical portion 7b and an internal gear 7a is formed on the inner peripheral surface of the cylindrical portion 7b. A portion of the cylindrical portion 7b is fitted into the circular recess 5a of the machine frame 5 so as to be coaxial and relatively rotatable. As shown in FIG. 7 which is an enlarged view of the main part of FIG. 6B, a sliding outer peripheral surface 7d is formed on the outer peripheral surface of the cylindrical portion 7b, and the sliding outer peripheral surface 7d is the inner peripheral surface of the machine casing 5. By sliding with 5b, the lid body 7 is restricted in the radial direction with respect to the machine casing 5. A flange portion 7e protruding outward in the radial direction is formed on the reaction machine frame 5 side of the cylindrical portion 7b. The end surface 7j on the machine frame 5 side of the cylindrical portion 7b slides with the bottom surface 5e of the circular recess 5a in the machine frame 5. A gap 21 is formed between the outer surface 7 i on the machine frame 5 side of the flange 7 e and the end surface 5 c on the opening side of the machine frame 5.

  A ring-shaped holder 8 is provided as a regulating member that regulates relative movement of the lid body 7 in the axial direction with respect to the machine casing 5. That is, the right side of the holder 8 is bent in a U-shape so as to sandwich the outer peripheral portion of the machine frame 5 from the axial direction, and the inner surface of the left end portion of the holder 8 slides from the axial direction to the outer peripheral portion of the flange portion 7e. It is in dynamic contact and regulates the lid 7 in the axial direction. Thereby, the machine frame 5 and the lid body 7 are held so as to be relatively rotatable without being separated in the axial direction.

  A pair of lock teeth 10 are disposed so as to be swingable between the machine frame 5 and the lid 7 in the axial direction and in the vertical position of FIG. A substantially cylindrical shaft protrusion 11 having an inner peripheral side guide surface 11a is formed integrally with the machine frame 5 on the inner peripheral side of the circular arc track for guiding the lock tooth 10 to be swingable along the circular arc track. ing. On the other hand, on the outer peripheral side in the vicinity of both ends of the arcuate track for guiding the lock tooth 10 to be swingable along the arcuate track, a pair of first guide projections 12A and second guide projections for guiding the locktooth 10 are provided. 12B is formed integrally with the machine casing 5 by two sets corresponding to the number of the lock teeth 10. A first outer peripheral guide surface 12a and a second outer peripheral guide surface 12b are formed on the first guide protrusion 12A and the second guide protrusion 12B. On the other hand, the lock tooth 10 includes a sliding inner peripheral surface 10c that slides with the inner peripheral guide surface 11a, and a first sliding outer periphery that slides with the first outer peripheral guide surface 12a and the second outer peripheral guide surface 12b, respectively. A surface 10a and a second sliding outer peripheral surface 10b are formed.

  Since the lock tooth 10 swings along the circular arc track, the inner peripheral guide surface 11a, the sliding inner peripheral surface 10c, and the first outer peripheral side as six surfaces which are three sets of surfaces for forming the circular arc track. The guide surface 12 a, the first sliding outer peripheral surface 10 a, the second outer peripheral guide surface 12 b, and the second sliding outer peripheral surface 10 b are formed in an arc shape that is coaxial with the center of the shaft protrusion 11. An external gear 10d that can mesh with the internal gear 7a is formed on the surface of the lock tooth 10 that swings along the arcuate track and faces the internal gear 7a.

  In order to press the lock tooth 10 provided with the external gear 10d in this way toward the internal gear 7a, a cam 9 is provided. The cam 9 is rotated counterclockwise in FIG. 6A around the center hole 9e, thereby pressing the pair of lock teeth 10 radially outward to cause the external gear 10d to move to the internal gear 7a. A lock cam surface 9a for meshing with each other and a lock release cam surface 9b for releasing the meshing by rotating clockwise are formed side by side. By meshing the external gear 10d with the internal gear 7a, the rotation of the lid 7 with respect to the machine frame 5 is restricted, and the seat back 3 is held at a predetermined angular position with respect to the seat cushion 2.

  On the other hand, a recess 10f is formed at the outer peripheral side of the circular arc track and in the center in the length direction of the lock tooth 10, and on both sides of the recess 10f, the lock cam surface 9a and the unlocking cam surface 9b of the cam 9 are engaged and disengaged. A pressed part is formed. The left and right first guide protrusions 12A are formed with sliding contact surfaces 12d parallel to the line connecting the upper and lower lock cam surfaces 9a, while the cam 9 has a circular arc centered on the center hole 9e. A sliding outer peripheral surface 9c is formed. As a result, the cam 9 is allowed to slide in contact with the sliding contact surface 12d in a state where movement in the left-right direction is restricted, and movement in the up-down direction is allowed and can rotate. A spring hook 9d is formed by cutting out the end of the sliding outer peripheral surface 9c in a stepped shape.

  In order to urge the cam 9 in the locking direction, a torsion coil spring 19 is disposed between the pair of the first guide protrusion 12A and the second guide protrusion 12B adjacent in the circumferential direction. An operation lever 20 that rotates the cam 9 in the unlocking direction against the urging force of the torsion coil spring 19 is provided. This will be described in detail below.

  Arc recesses 12e and 12e are formed on the surfaces of the first guide protrusion 12A of one set adjacent to each other in the circumferential direction and the second guide protrusion 12B of the other set, and the arc recesses 12e facing each other. And the arc recess 12e are formed such that the radial outer periphery is wide and the center is narrow. For this reason, a substantially semicircular spring accommodating space 21 is formed on the radially outer peripheral side, while convex portions 12c facing each other are formed on the end portion on the radial center side. A cylindrical winding portion 19 c of the torsion coil spring 19 is accommodated in the spring accommodating space 21. In the torsion coil spring 19, both ends of the winding portion 19c are bent outward to form an engagement end portion 19a and a biasing end portion 19b, and the engagement end portion 19a and the biasing end portion 19b are opened in the mutual direction. As a result, the torsion coil spring 19 is held in engagement with each of the convex portions 12c.

  The torsion coil spring 19 is arranged so that the axis of the coil is substantially parallel to the axis of the machine frame 5, and the urging end 19 b is hooked on the spring hook 9 d formed on the outer peripheral surface of the cam 9. It has been. A regulating member 17 is provided that abuts against the engagement end portion 19a of the torsion coil spring 19 and restricts the torsion coil spring 19 in the axial direction. That is, as shown in FIG. 6B, a cylindrical portion 7g protruding in the axial direction is formed at the center of the inner surface of the lid body 7, and a ring-plate-like regulating member 17 is fitted into the cylindrical portion 7g. Yes.

  As shown in FIG. 6 (b), a circular anti-rotation projection 5b is formed on the outer surface of the machine frame 5 corresponding to the spring accommodating space 21, and the anti-rotation projection 5b is formed in the base bracket 4 shown in FIG. Is fitted into a circular detent hole 4a. Since the machine frame 5 is press-molded, a circular recess 5g shown in FIG. 8 is inevitably formed on the opposite surface of the circular detent projection 5b. Since the spring accommodating space 21 is located on the outer peripheral side of the machine frame 5 in the radial direction, the circular anti-rotation protrusion 5b can also be disposed on the outer peripheral side in the radial direction, which is advantageous in terms of strength. In addition, on the outer surface of the machine frame 5, there is an elliptical anti-rotation protrusion 5d that is long in the radial direction at a position corresponding to the lock tooth 10 and between the shaft protrusion 11 and the second guide protrusion 12B. The elliptical anti-rotation protrusion 5d is fitted into an elliptical anti-rotation hole 4b formed in the base bracket 4 shown in FIG. As shown in FIG. 8, a concave portion 5h is inevitably formed on the opposite surface of the anti-rotation protrusion 5d.

  On the other hand, a plurality of circular detent projections 7n protruding outward in the axial direction are formed on the outer surface of the lid body 7 at intervals on the circumference. The anti-rotation protrusion 7n is fitted in a circular anti-rotation hole (not shown) formed in the arm bracket 6 of FIG.

  In addition, the seat back 3 has an angular position that is locked with respect to the seat cushion 2 and an angular position that is not locked. To set the angular position that is not locked, the lock tooth 10 has an axial direction toward the lid 7. As shown in FIG. 8, a restricting portion that protrudes toward the center in the radial direction is formed on the inner surface of the lid body 7 in order to restrict the stopper 10e from moving toward the outer peripheral side in the radial direction. 7m is formed.

  As shown in FIG. 6B, the vehicle seat reclining device 1 is disposed on each side in the width direction of the seat cushion 2, and the operation shaft 15 provided individually on the left and right vehicle seat reclining devices 1 is provided. Inner ends are connected to each other via a cylindrical shaft 16. That is, the operation shaft 15 is press-fitted and fixed in the center hole 9e of the cam 9, and the inner end portion of the operation shaft 15 is a shaft via a serration 15a formed on the outer peripheral surface and a serration 16a formed on the inner peripheral surface. 16. An operation lever 20 shown in FIG. 9 is attached to an outer end portion of one operation shaft 15 via a serration 15b shown in FIG. 6B.

Next, the configuration of the lid 7 will be described in detail. As shown in FIG. 1, the lid body 7 is obtained by half-cutting a disk by pressing and making the punching depth H substantially the same as the thickness S ₁ of the cylindrical portion 7b (H = S ₁ ). . The cylindrical portion 7b that forms the outer portion of the circular concave portion 7c and the disc portion 7p that forms the bottom surface of the circular concave portion 7c are positioned substantially perpendicular to each other by half-cutting the disk. A half-punching member comprising a ring-shaped connecting portion 7q that connects an end surface on the inner peripheral side of the cylindrical portion 7b and an outer peripheral surface on the cylindrical portion side of the disc portion is provided, and the cylindrical portion 7b in the half-punching member 7 is formed by machining the outer peripheral portion of FIG.

The ring-shaped connecting portion 7q is formed in an arc shape having a substantially uniform dimension T on the disk portion side having a cross-sectional thickness sufficient to ensure strength. That is, a circumferential groove 7u is formed on the outer peripheral portion of the bottom surface of the disk portion 7p to ensure engagement with the external teeth 10d of the lock tooth 10, and the bottom surface of the circumferential groove 7u and the internal gear 7a. the tooth bottom and have been connected by an arc of the corner radius, if the radius of the inner peripheral surface of the circular plate portion of the connecting portion 7q and R ₃ is a radius of the arc of該隅Earl, the radius of the outer circumferential surface The dimension is formed in an arc having a radius dimension R ₄ centering on a point “Q” that substantially coincides with the center of the arc of the corner radius, and the cross-sectional thickness of the arc-shaped portion 7t is substantially uniform. On the other hand, on the cylindrical portion side of the ring-shaped connecting portion 7q, a linear portion 7s having a linear outer peripheral surface connected to the arc-shaped outer peripheral surface of the arc-shaped portion 7t is formed. The linear shape portion 7s is a tapered surface that forms θ = 45 degrees as a predetermined angle with respect to the end surface of the cylindrical portion 7b. In addition, the half blanking member, the radial dimension size of R ₁ of the outer peripheral surface of the circular plate portion 7p is, the radius of the addendum circle of the internal gear 7a which is formed on the inner peripheral surface of the cylindrical portion 7b It is set substantially equal to the dimension R _2, and the tooth tip of the outer peripheral surface and the internal gear 7a of the disc portion 7p is positioned substantially the same cylindrical plane.

As described above, the connection portion 7q is formed by the arc-shaped portion 7t and the linear-shaped portion 7s for the following reason. As shown in FIG. 2, which is a principle diagram, the cross-sectional shape of the outer peripheral surface of the connecting portion 7q is a circle having a radius R ₄ with a thickness dimension T that can ensure the strength so that the strength is the same at any position. It is also conceivable to use an arc-shaped portion. If all the arc-shaped portions are formed, the hatched portion of the meat becomes unnecessary as compared with the case where the straight-shaped portion is a tapered surface of θ = 45 degrees as described above. Since this arc-shaped portion is formed, the amount of meat moving from the inner peripheral side of the cylindrical portion 7b toward the connecting portion 7q is reduced as shown by the arrow, and the sagging 7r is reduced. Therefore, as shown in FIG. 3A, when the cross-sectional shape of the outer peripheral surface of the connecting portion 7q is all a linear shape portion, as shown in FIG. Consider the strength of the connecting portion 7q in the case where the arc-shaped portion and the linear portion are separated as in the present invention shown in FIG. Location at which the strength of the connecting portion 7q is minimized in the case of FIG. 3 (a) is a central portion which is the minimum T _min thickness, the overall strength because the same thickness in the case of FIGS. 4 (a) Equally, in the case of FIG. 5 (a), only the arc-shaped portion has the same thickness, so the strength of the arc-shaped portion is equally minimum. Here, in the case of these three, the minimum value of the thickness of the connecting portion 7q is to become the same value becomes T _min, the strength becomes substantially equal.

Next, in each of the three cases, when the thickness of the disc that is half-punched at the same half-punch depth H is increased from S ₁ to S ₂ (when the disc thickness is increased using the same press die) Are shown in FIGS. 3B, 4B, and 5B. In any case, since the position of the connection portion 7q is lowered relative to the bottom surface of the circular recess 7c, the thickness dimension of the cross section increases as a whole, but the thickness dimension is radial (from upper left to lower right). 3), the thickness increase rate on the cylindrical portion side is small, and as a result, the thickness on the cylindrical portion side is relative in any of FIGS. 3 (b), 4 (b), and 5 (b). To a minimum T _min . Next, when FIG. 4B is compared with FIG. 5B, the arc-shaped portion having the minimum strength T _min in the state of FIG. 5A becomes the state of FIG. 5B. Since the position of the bottom of the circular recess 7c increases, the thickness increases and “strength increases”, and as a result, the strength is minimized at the portion T _min of the linear portion, while FIG. ), The thickness of the connecting portion 7q on the cylindrical portion side is measured from the upper left to the lower right of the figure in the direction close to the horizontal direction, so the “strength increasing effect” is slight and the strength is minimized. Is the T _min portion on the right.

That is, the strength is substantially the same in FIGS. 3A, 4A, and 5A, whereas in FIGS. 3B, 4B, and 5B, FIG. In the case of (b), the strength is the smallest. Further, even if the cylindrical portion side is formed in an arc shape as shown in FIG. 4B and the meat is reduced, the effect of suppressing the sagging 7r is small because it is away from the position of the sagging 7r. Therefore, it is desirable to increase the strength by increasing the thickness while holding the right part in a straight line shape. From the above, the concept of FIG. 5 is adopted in the present invention from the viewpoint of reduction of sagging and securing of strength.
(Function)
Next, the operation of the vehicle seat reclining device 1 will be described.

  In the state where the vehicle seat reclining device 1 is assembled to the seat, the cam 9 is rotated counterclockwise by the biasing force of the torsion coil spring 19, as shown in FIG. The lock tooth 10 is pressed by the lock cam surface 9a, and the lock tooth 10 is guided by the inner peripheral side guide surface 11a, the first outer peripheral side guide surface 12a, and the second outer peripheral side guide surface 12b, and the shaft protrusion 11 is the center. It swings clockwise and the external gear 10d is in a state of meshing with the internal gear 7a of the lid 7. That is, the rotation of the seat back 3 is restricted.

  Next, when the operating lever 20 is operated and the operating shaft 15 is rotated in the clockwise direction in FIG. 6A against the urging force of the torsion coil spring 19, the lock cam surface 9a of the cam 9 and the lock tooth 10 Is released, and the unlocking cam surface 9b presses the lock tooth 10 counterclockwise about the shaft projection 11. For this reason, the lock tooth 10 swings counterclockwise about the shaft protrusion 11, the external gear 10 d is disengaged from the internal gear 7 a, and is unlocked, and the lid 7 is attached. The arm bracket 6 and the seat back 3 are rotated forward by a biasing force of a spring (not shown).

  When the seat back 3 is rotated backwardly against the biasing force of a spring (not shown) and released from the operation lever 20 at the desired angular position of the seat back 3, the biasing force of the torsion coil spring 19 causes The cam 9 rotates counterclockwise, and the lock cam surface 9 a presses the lock tooth 10. For this reason, the external gear 10d of the lock tooth 10 meshes with the internal gear 7a and returns to the locked state of FIG. 6 (a) again.

  In FIG. 7, the outer peripheral surface convex portion 7k formed by connecting two surfaces of the sliding outer peripheral surface 7d of the cylindrical portion 7b of the lid body 7 and the end surface 7j of the cylindrical portion 7b on the machine frame 5 side at right angles is shown in FIG. The inner surface 5b and the bottom surface 5e of the circular recess 5a of the frame 5 are fitted into an inner surface recess 5f formed by connecting them at right angles, and the lid body 7 slides relative to the machine frame 5. Rotate relatively.

  According to the present invention, the ring-shaped connecting portion 7q is used for forming the connecting portion 7q as compared with the case where the outer peripheral surface is a linear shape because the shape on the disk portion side is an arc shape having a substantially uniform thickness. The required amount of meat is minimal. On the other hand, since the strength of the connecting portion is not different from the conventional one, there is no problem with the strength.

  According to this vehicle seat reclining device, the shape of the ring-shaped connecting portion 7q on the disc portion side is an arc shape having a substantially uniform thickness, so that the amount of meat used to form the connecting portion 7q is the minimum necessary. Since the amount of meat is smaller than that in the case of the linear shape, the amount of meat drawn from the inner peripheral portion of the cylindrical portion 7b to the connecting portion 7q is reduced, and the opening portion of the cylindrical portion 7b is correspondingly reduced. Occurrence of sagging 7r on the side end face can be suppressed. Thereby, the effective tooth width of the internal gear 7a can be increased, and the meshing strength of the lock tooth 10 with the external gear 10d can be improved.

  According to the present invention, the thickness of the arc-shaped portion 7t in the connecting portion 7q is substantially uniform at any position, and the strength of the arc-shaped portion 7t is substantially uniform at any position.

  According to this vehicle seat reclining device, since the inner peripheral surface and the outer peripheral surface of the arc-shaped portion 7t are formed in an arc shape having the center at substantially the same position, the cross-sectional thickness can be formed substantially uniformly. Thereby, the amount of meat required for forming the arcuate portion 7t can be minimized. Further, for example, when half-cutting to a depth substantially equal to the plate thickness of the disk, the cross-sectional thickness of the arc-shaped portion 7t is the thinnest and becomes a weakened portion, but the arc-shaped portion 7t is on the disc portion side. Since it is formed, the thickness of the arc-shaped portion 7t can be easily managed with the half-cutting depth.

According to this invention, the radial dimension R ₁ of the outer peripheral surface of the disc part 7p is made substantially the same as the radial dimension R _{2 of the} tip circle of the internal gear 7a formed on the inner peripheral surface of the cylindrical part 7b. The meat generated by the formation of the internal gear 7a is used as the meat used for forming the connection portion 7q.

  According to this vehicle seat reclining device, since the meat generated by the formation of the internal gear 7a is used as the meat of the connecting portion 7q, the amount of meat drawn into the connecting portion 7q from the inner peripheral portion of the cylindrical portion 7b is reduced. The amount can be reduced by as much, and the occurrence of sagging 7r can be suppressed. That is, it is possible to suppress the occurrence of sagging 7r from two directions by adopting a configuration for reducing the demand for meat and a configuration for supplying a part of the meat from the other for the formation of the connecting portion 7q.

In this embodiment, the center of the outer peripheral surface (radius dimension R ₄ ) and the center of the inner peripheral surface (radius dimension R ₃ ) of the arc-shaped portion 7t are arranged at the same position. 1 may be slightly shifted downward (in a direction approaching the disc portion 7p).

DESCRIPTION OF SYMBOLS 1 ... Vehicle seat reclining device 2 ... Seat cushion 3 ... Seat back 5 ... Machine frame (base member)
7: Lid (rotating member)
7a ... Internal gear 7b ... Cylindrical part 7c ... Circular concave part 7p ... Disk part 7q ... Connection part 7r ... Sag 7s ... Linear shape part 7t ... Arc shape part 10 ... Lock tooth 10d ... External gear

Claims (3)

A base member coupled to one of a seat cushion and a seat back rotatable with respect to the seat cushion, and a base member coupled to the other and rotatable relative to the base member and half-cutting the disk And a rotating member having an inner gear formed on an inner peripheral surface of the circular recess, and an outer gear that can mesh with the inner gear, the outer gear being the inner gear. A lock tooth provided movably through a guide portion formed on the base member in a direction to be engaged with and disengaged from
The rotating member forms a portion on the outer peripheral side of the circular concave portion and the cylindrical portion in which the internal gear is formed on the inner peripheral surface, and the disc portion forming the bottom surface of the circular concave portion are substantially perpendicular to each other. In the vehicle seat reclining device formed by the ring-shaped connecting portion that connects the end surface on the inner peripheral side of the cylindrical portion and the outer peripheral surface on the cylindrical portion side of the disc portion that are in a positional relationship,
The ring-shaped connecting portion is formed on the disk portion side and has a substantially uniform cross-sectional thickness, and the outer peripheral surface is formed in an arc shape with an arc shape and the outer peripheral surface of the arc shape portion. A vehicle seat reclining device characterized in that an outer peripheral surface is constituted by a linear shape portion having a linear shape, and the linear shape portion is inclined by a predetermined angle with respect to an end surface of the cylindrical portion. The vehicle seat reclining device according to claim 1,
The arc-shaped portion has an arc shape in which the inner peripheral surface connects the tooth bottom of the internal gear and the bottom surface of the disc portion with an arc, and the outer peripheral surface is centered on a point substantially coincident with the center of the arc. A vehicle seat reclining device having an arc shape. The vehicle seat reclining device according to claim 1 or 2,
A vehicle seat reclining device, wherein a radial dimension of an outer peripheral surface of the disk part is substantially the same as a radial dimension of a tip circle of the internal gear formed on an inner peripheral surface of the cylindrical part.

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