JP2013070856A - Reclining device - Google Patents

Abstract

A reclining device capable of improving the welding strength between a base plate and a bracket is provided.
A reclining device (20) includes a base plate (30) attached to a lower bracket (11a), a gear plate (40) attached to an upper bracket (12a), and a lock gear having outer teeth (61a, 62a) meshable with inner teeth (41) of the gear plate (40). 61, 62 and a cam 70 for controlling the movement of the lock gears 61, 62 outward in the radial direction. The base plate 30 is attached to the lower bracket 11a by being welded to the lower bracket 11a at one outer peripheral surface 35 thereof.
[Selection] Figure 5

Description

  The present invention relates to a reclining device that adjusts a tilt angle between a first bracket and a second bracket that are relatively tilted.

  2. Description of the Related Art Conventionally, a vehicle seat reclining device disclosed in Patent Document 1 below is known as a reclining device that adjusts a tilt angle between a first bracket and a second bracket that are relatively tilted. The reclining device includes a base side case fixed to the base bracket and an arm side case fixed to the arm bracket and rotatably supported by the base side case. Then, the cam member rotates in accordance with the rotation of the center shaft, and the pair of lock teeth supported by the base side case meshes with the inner peripheral tooth portion of the arm side case at the outer peripheral tooth portion and the inner peripheral tooth. By displacing between the position away from the part, the state is switched between the state in which the locked state is maintained and the state in which the locked state is released.

  In addition, four circular mounting protrusions and a pair of protrusions larger than the outer shape of the lock spring are provided on the outer surface of the base side case at intervals in the circumferential direction. Then, the base-side case is fixed to the base bracket by welding with the mounting protrusions and the protrusions being inserted into the mounting holes of the base bracket.

JP 2008-212176 A

  By the way, in a reclining device that is desired to be reduced in size, if the diameter of the base plate (base case) is simply reduced, the welding protrusion formed on the outer surface of the base plate approaches the center of rotation. For this reason, when the base plate and the bracket to be fixed are welded using the protruding portion approaching the rotation center, the welded portion approaches the rotation center, and the moment force acting around the rotation center is applied. As a result, there arises a problem that the welding strength at the welded portion is insufficient.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a reclining device capable of improving the welding strength between a base plate and a bracket.

  In order to achieve the above object, the reclining device according to claim 1 according to the claims is a reclining that adjusts the tilt angle between the first bracket (11a) and the second bracket (12a) that tilt relative to each other. A device (20, 20a), a base plate (30, 30a) attached to the first bracket, and an internal tooth attached to the second bracket and assembled to be rotatable relative to the base plate. A gear plate (40) having (41) and an external tooth which is assembled so as to be guided to be movable in the radial direction with respect to the guide portions (31, 32) formed on the base plate, and can mesh with the internal teeth. Lock gears (61, 62) having (61a, 62a), and movement of the lock gear outward in the radial direction to control the external teeth A cam (70) meshed with the inner teeth, and the base plate is attached to the first bracket by being welded to the first bracket at an outer peripheral surface (35) thereof. And

  According to a second aspect of the present invention, in the reclining device according to the first aspect, the inner surface of the first tubular portion (51) contacts the portion of the outer peripheral surface of the base plate where the first bracket is not welded. A cover that holds the base plate and the gear plate so as to be relatively rotatable while being in sliding contact with the gear plate on the inner surface of the second cylindrical portion (52), and suppresses relative movement in the axial direction ( 50), and a projecting portion (33) projecting annularly in the axial direction on the other side in the axial direction is engaged with the outer peripheral surface (36) of the gear plate on the inner peripheral surface thereof. Preferably, the cover is fixed to the base plate by welding the first tubular portion to the base plate from the outer peripheral side.

  The invention according to claim 3 is the reclining device according to claim 2, wherein a gap (X) is formed between the end surface (33a) on the other side in the axial direction of the protrusion and the cover, and the protrusion Is formed by plastic working.

  According to a fourth aspect of the present invention, in the reclining device according to any one of the first to third aspects, the welding position of the first bracket and the base plate is provided at a position where welding is possible from the gear plate side. Features.

According to a fifth aspect of the invention, in the reclining device according to any one of the first to fourth aspects, the first bracket and the base plate are welded by laser welding.
In addition, the code | symbol in each said bracket | parenthesis shows the corresponding relationship with the specific means as described in each embodiment mentioned later.

  In the first aspect of the present invention, the base plate is welded to the first bracket by being welded to the first bracket at the outer peripheral surface thereof, so that the welding location can be kept away from the rotation center. Thereby, with respect to the moment force etc. which acts centering on the said rotation center, the welding strength in a welding location is raised and the welding strength of a baseplate and a bracket can be improved.

  In the second aspect of the invention, the inner surface of the first cylindrical portion contacts the portion of the outer peripheral surface of the base plate where the first bracket is not welded, and the inner surface of the second cylindrical portion contacts the gear plate. A cover is provided that holds the base plate and the gear plate in a slidable contact state so as to be capable of relative rotation and suppresses relative movement in the axial direction. A projecting portion that projects annularly in the axial direction on the other side in the axial direction is formed on the outer edge of the base plate so as to be engageable with the outer peripheral surface of the gear plate on its inner peripheral surface, and the first cylindrical portion is the base plate The cover is fixed to the base plate by welding from the outer peripheral side.

  For this reason, since a cover is fixed to a base plate, without providing the site | part for fixing a cover, etc. to the outer peripheral part of a base plate, a radial dimension can be made small and such a radial dimension is small. Even if it is a base plate, the welding strength in a welding location is raised and the welding strength of a base plate and a bracket can be improved.

  According to the third aspect of the present invention, a gap is formed between the end face on the other axial side of the protrusion and the cover, and the protrusion is formed by plastic working. Thus, since a clearance gap is formed between the end surface of the other side in the axial direction of the protruding portion and the cover, the dimensional accuracy required for the protruding portion is reduced. Thereby, as a method for forming the protruding portion, it is possible to employ plastic working such as iron forming which can be formed at low cost although the processing accuracy is relatively low.

  In the invention of claim 4, the welding location of the first bracket and the base plate is provided at a position where welding is possible from the gear plate side. As a result, the welding of the outer peripheral surface of the base plate and the first bracket and the welding of the gear plate and the second bracket can be performed from the same gear plate side. Thus, the welding process is simplified, and the welding time can be shortened and the manufacturing cost related to welding can be reduced.

  In the invention of claim 5, since the first bracket and the base plate are welded by laser welding, the welding time can be shortened as compared with other welding methods such as arc welding.

It is a side view showing the composition outline of the vehicular seat where the reclining device concerning a 1st embodiment is installed. It is sectional drawing of a reclining apparatus. It is sectional drawing by the cut surface equivalent to the 3-3 line shown in FIG. It is sectional drawing by the cut surface equivalent to the 4-4 line shown in FIG. It is an expanded sectional view showing the welding state of a base plate and a lower bracket. It is an expanded sectional view showing an important section of a reclining device concerning the 1st modification of a 1st embodiment. It is an expanded sectional view showing an important section of a reclining device concerning the 2nd modification of a 1st embodiment. It is an expanded sectional view showing an important section of a reclining device concerning the 3rd modification of a 1st embodiment. It is an expanded sectional view showing an important section of a reclining device concerning the 4th modification of a 1st embodiment. It is an expanded sectional view showing an important section of a reclining device concerning a 2nd embodiment. It is an expanded sectional view showing an important section of a reclining device concerning the 1st modification of a 2nd embodiment.

[First Embodiment]
Hereinafter, a first embodiment of a reclining device according to the present invention will be described with reference to the drawings. FIG. 1 is a side view showing a schematic configuration of a vehicle seat 10 on which a reclining device 20 according to the first embodiment is installed.
As is well known, the vehicle seat 10 includes a seat cushion 11 and a seat back 12 as main components. The seat cushion 11 includes a seat bracket (lower bracket) 11a, and the seat back 12 includes a seat back bracket (upper side). Brackets) 12a are fixed.

  The lower bracket 11a and the upper bracket 12a are coupled to each other so as to be relatively rotatable by being fixed to the relatively rotating portions of the round reclining unit 21, respectively. Thereby, the tilt angle of the seat back 12 with respect to the seat cushion 11 can be adjusted. The lower bracket 11a corresponds to an example of a “first bracket” recited in the claims, and the upper bracket 12a corresponds to an example of a “second bracket” recited in the claims. obtain.

  A reclining operation lever 23 is attached to the center shaft 22 at the center of the round reclining unit 21. A reclining device 20 is constituted by the round reclining unit 21, the center shaft 22 and the reclining operation lever 23. When the reclining operation lever 23 is pulled upward, the reclining device 20 is unlocked and the tilt angle of the seat back 12 can be adjusted. Here, the range of the angle A shown in FIG. 1 in which the seat back 12 is tilted backward is an inclination adjustment range in which the seat back 12 is locked at the angle position when the finger is released from the reclining operation lever 23. The range of angle B shown in FIG. 1 in which the back 12 is tilted forward is a free rotation range corresponding to a lock-free state in which the unlocked state continues even if the finger is released from the reclining operation lever 23. As can be seen from FIG. 1, the seat back 12 can be rotated from a forwardly tilted position in contact with the seat cushion 11 to a backwardly tilted position that becomes flat with the seat cushion 11. The structure of such a reclining device 20 will be described below.

  FIG. 2 is a cross-sectional view of the reclining device 20. FIG. 3 is a cross-sectional view taken along the line 3-3 shown in FIG. 4 is a cross-sectional view taken along the line 4-4 shown in FIG. FIG. 5 is an enlarged cross-sectional view showing a welded state between the base plate 30 and the lower bracket 11a. In FIG. 2, for the sake of convenience, the center shaft 22 and the reclining operation lever 23 are not shown. In FIG. 4, only the vicinity of the inner teeth 41 is shown for the gear plate 40. Further, the following description will be made with the left side of the drawing in FIG. 2 as one axial direction and the right side of the drawing as the other side in the axial direction.

  As shown in FIG. 2, the round reclining unit 21 is configured so that the base plate 30 and the gear plate 40 are rotated relative to each other by assembling the cover bracket 50 by superimposing the substantially disc-shaped base plate 30 and the substantially bowl-shaped gear plate 40. It is configured to be held as possible and to prevent relative movement in the axial direction.

  A cavity (space) C is formed between the base plate 30 and the gear plate 40. In this cavity C, as shown in FIGS. 2 to 4, a total of four lock gears of a pair of first lock gears 61 and a pair of second lock gears 62, a central cam 70, and two substantially arc-shaped spring members. A member for locking and unlocking 80 and a substantially disk-shaped lever plate 90 is disposed.

  As shown in FIG. 3, the base plate 30 is formed with four guide convex portions 31, 32, 31, 32 for guiding the lock gears 61, 62 in the radial direction on the side surface on the other side in the axial direction. . Each of the guide convex portions 31 and 32 may correspond to an example of a “guide portion” described in the claims.

  Further, an annular projecting portion 33 that projects annularly in the axial direction on the other side in the axial direction is formed on the outer edge of the base plate 30 so as to be able to engage with a part of the outer peripheral surface of the gear plate 40 on its inner peripheral surface. Yes. The base plate 30 is formed with guide protrusions 31, 32, etc. by plastic working such as press working, and in particular, the annular projection 33 is formed by ironing (plastic working). The base plate 30 formed in this manner is welded in a state where the base plate 30 is engaged with the engagement hole 11b of the lower bracket 11a at a portion on the axial direction side of the outer peripheral surface (hereinafter referred to as the one outer peripheral surface 35). By doing so, it is attached to the lower bracket 11a. The annular protrusion 33 can correspond to an example of a “protrusion” described in the claims.

  Inner teeth 41 are formed on the inner peripheral surface of the annular outer edge of the gear plate 40 over the entire periphery. The gear plate 40 thus formed has a plurality of protrusions 42 formed on the back surface (the surface on the other side in the axial direction). The protrusions 42 are engaged with the engagement holes 12b of the upper bracket 12a, respectively. It is attached to the upper bracket 12a by welding and joining in the state.

  As shown in FIG. 3, external teeth 61 a and 62 a that can mesh with the internal teeth 41 of the gear plate 40 are formed on the outer peripheral sides of the first lock gear 61 and the second lock gear 62. In addition, the lock gears 61 and 62 are formed with protrusions 61b and 62b that protrude to the other side in the axial direction. Both first lock gears 61 are guided by linear portions (guide portions) between the movable guide 34 guided by the guide convex portion 32 and the side peripheral portion of the guide convex portion 31, and are supported so as to be slidable only in the radial direction. ing. Further, both the second lock gears 62 are supported by the guide portions of the side peripheral portions of the guide convex portions 31 and 32 so as to be slidable only in the radial direction.

  In the center of the base plate 30, a plate-like cam 70 having a through hole 71 formed at the center is rotatably disposed. The cam 70 is formed with a cam surface 72 that contacts the rear end surface of each lock gear 61, 62 on the outer peripheral surface, and protrudes to the other side in the axial direction with two engagement holes 73 that engage one end of the spring member 80 on the side surface. Two columnar projections 74 are formed.

  As shown in FIG. 4, the cam 70 is strongly biased in the lock rotation direction (clockwise in FIGS. 3 and 4) by engaging with one end of each of the two spring members 80. As a result, the cam 70 abuts against the rear end surfaces of the lock gears 61 and 62 at the cam surface 72, so that the lock gears 61 and 62 are moved radially outward by the urging force in the lock rotation direction by the spring members 80. It will be strongly urged. Note that the other ends of the spring members 80 are respectively engaged with the base plate 30 so as to penetrate through the through holes of the movable guide 34.

  The center shaft 22 is inserted into the through hole 71 of the cam 70, and the cam 70 is unlocked in the direction of unlocking against the urging force of the two spring members 80 by rotating the center shaft 22 (see FIGS. 3 and 3). 4 in a counterclockwise direction).

  As shown in FIG. 4, the lever plate 90 is provided with a through hole 91 that fits into both protrusions 74 of the cam 70, two cam holes 92, and two cam holes 93. The lever plate 90 is configured such that the through holes 91 and the protrusions 74 are fitted, the protrusions 61b are inserted into the cam holes 92, and the protrusions 62b are inserted into the cam holes 93, respectively. And it is assembled | attached to each lock gear 61,62.

  Thus, when the lever plate 90 rotates together with the cam 70 in the unlock rotation direction, the inner peripheral edge of the cam hole 92 abuts against the protrusion 61b of the first lock gear 61, and the inner peripheral edge of the cam hole 93 corresponds to both the second lock gears. 62 abuts on the projection 62b of the respective 62. When the lever plate 90 further rotates in the unlocking rotation direction, the protrusions 61b and 62b are urged radially inward by the inner peripheral edges of the cam holes 92 and 93, and the lock gears 61 and 62 are radially inward. Will be moved to.

  As shown in FIG. 5, the cover bracket 50 includes a cylindrical first cylindrical portion 51 and a stepped cylindrical second cylindrical portion 52. The first cylindrical portion 51 comes into contact with the other side portion in the axial direction (hereinafter referred to as the other side outer peripheral surface 36) where the lower bracket 11a is not welded among the outer peripheral surface of the base plate 30 on the inner peripheral surface thereof. Is formed.

  Further, when the cover bracket 50 is fixed to the base plate 30, the second cylindrical portion 52 is in sliding contact with the outer peripheral surface and the side surface in the vicinity of the outer edge portion on the other axial side of the gear plate 40 on the inner peripheral surface thereof. The annular protrusion 33 is formed so as not to contact the end surface 33a on the other axial side. That is, the gap X shown in FIG. 5 is formed in the axial direction between the inner peripheral surface of the second cylindrical portion 52 and the end surface 33a. As described above, since the gap X is formed between the end surface 33a and the second cylindrical portion 52, the annular surface is compared with the case where the end surface 33a is abutted against the second cylindrical portion 52 and fixed. The dimensional accuracy required for the protrusion 33 is reduced.

  The cover bracket 50 formed in this way has the first cylindrical portion 51 in contrast to the base plate 30 and the gear plate 40 in which the lock gears 61 and 62 and the cam 70 are disposed in the cavity C and assembled together. The second cylindrical portion 52 is in contact with the other outer peripheral surface 36 of the base plate 30 and is in sliding contact with the gear plate 40 so that the gap X is formed. And the cover bracket 50 is fixed to the base plate 30 by the 1st cylindrical part 51 being weld-joined by laser welding from the outer peripheral side with respect to the base plate 30 (refer arrow (alpha) 1 of FIG. 5). Thereby, the base plate 30 and the gear plate 40 are held by the cover bracket 50 so as to be relatively rotatable, and the relative movement in the axial direction is suppressed. And if the reclining operation lever 23 is assembled | attached with respect to the center shaft 22 inserted in the through-hole 71 of the cam 70, the reclining apparatus 20 shown in FIG. 2 will be completed.

The reclining device 20 configured as described above is welded in a state where the one outer peripheral surface 35 of the base plate 30 is engaged with the engagement hole 11b of the lower bracket 11a, and each projection 42 of the gear plate 40 is attached to the reclining device 20. Welding is performed in a state of being engaged with the engagement holes 12b of the upper bracket 12a. Specifically, in this embodiment, laser welding is employed in order to shorten the welding time. From one side in the axial direction, one outer peripheral surface 35 of the base plate 30 and the engagement hole 11b of the lower bracket 11a Are welded by laser welding (see arrow α2 in FIG. 5), and each projection 42 of the gear plate 40 and the engagement hole 12b of the upper bracket 12a are welded and joined by laser welding from the other side in the axial direction (see FIG. 5). (See arrow α3 in FIG. 5).
Thereby, the seat cushion 11 and the seat back 12 are coupled by the reclining device 20 so as to be capable of relative tilting.

An unlocked state and a locked state of the reclining device 20 according to this embodiment configured as described above will be described below.
(Unlocked)
First, the unlocked state in the reclining device 20 will be described.
When the occupant releases the lock to adjust the tilt angle of the seat back 12, the reclining operation lever 23 is operated to rotate the center shaft 22 in the unlocking rotation direction. Then, the cam 70 rotates together with the center shaft 22 in the unlock rotation direction against the urging force of both spring members 80.

  When the cam 70 rotates in the unlocking rotation direction, the contact between the cam surface 72 of the cam 70 and the rear end surfaces of the lock gears 61 and 62 is released, and the lock gears 61 and 62 are moved radially outward. The urging force by the cam 70 that is urging is released. As a result, the lock gears 61 and 62 can move inward in the radial direction, and the engagement between the inner teeth 41 of the gear plate 40 and the outer teeth 61a and 62a of the lock gears 61 and 62 can be released.

  Then, when the lever plate 90 rotates together with the cam 70 in the unlock rotation direction, the inner peripheral edges of the cam holes 92 and 93 of the lever plate 90 come into contact with the protrusions 61b and 62b of the lock gears 61 and 62, respectively. The lock gears 61 and 62 are positively moved radially inward to release the engagement between the inner teeth 41 and the outer teeth 61a and 62a.

  As described above, when the meshing between the inner teeth 41 and the outer teeth 61a and 62a is released, the rotation of the gear plate 40 becomes free and the round reclining unit 21 is unlocked. When the round reclining unit 21 is unlocked, the reclining device 20 is unlocked, and the tilt angle of the seat back 12 can be freely adjusted.

(Locked state)
Next, the locked state in the reclining device 20 will be described.
When the adjustment of the inclination angle of the seat back 12 by the occupant is completed, the reclining operation lever 23 is loosened, so that the cam 70 is rotated in the lock rotation direction by the urging force of both spring members 80.

  When the cam surface 72 of the rotating cam 70 comes into contact with the rear end surfaces of the lock gears 61 and 62, the lock gears 61 and 62 are urged radially outward. Accordingly, the outer teeth 61 a and 62 a of the lock gears 61 and 62 move radially outward so as to mesh with the inner teeth 41 of the gear plate 40.

  The outer teeth 61a and 62a of the lock gears 61 and 62 mesh with the inner teeth 41 of the gear plate 40, so that the rotation of the gear plate 40 is restricted and the reclining device 20 is locked.

  As described above, in the reclining device 20 according to the present embodiment, the base plate 30 is welded to the lower bracket 11a by being welded to the lower bracket 11a at its one outer peripheral surface 35. The location can be moved away from the center of rotation. Thereby, with respect to the moment force acting around the center of rotation, the welding strength at the welding location is increased, and the welding strength between the base plate 30 and the lower bracket 11a can be improved.

  In particular, the base plate 30 is in contact with the other outer peripheral surface 36 of the base plate 30 on the inner surface of the first cylindrical portion 51 and is in sliding contact with the gear plate 40 on the inner surface of the second cylindrical portion 52. A cover bracket 50 is provided that holds the gear 30 and the gear plate 40 so as to be relatively rotatable and suppresses relative movement in the axial direction. A projecting portion 33 projecting annularly in the axial direction on the other side in the axial direction is formed on the outer edge of the base plate 30 so as to be engageable with the outer peripheral surface of the gear plate 40 on the inner peripheral surface thereof. The cover bracket 50 is fixed to the base plate 30 by welding the portion 51 to the base plate 30 from the outer peripheral side.

  For this reason, since the cover bracket 50 is fixed to the base plate 30 without providing a portion for fixing the cover bracket 50 to the outer peripheral portion of the base plate 30, the radial dimension can be reduced. Even in the case of the base plate 30 having a small radial dimension, the welding strength at the welded portion can be increased and the welding strength between the base plate 30 and the lower bracket 11a can be improved.

  Further, a gap X is formed between the end surface 33a on the other axial side of the annular protrusion 33 and the cover bracket 50, and the annular protrusion 33 is formed by plastic working. As a result, the dimensional accuracy required for the annular protrusion 33 is reduced. Therefore, plastic processing such as ironing, which can be formed at a low cost, although the processing accuracy is relatively low, is adopted as a method for forming the annular protrusion 33. be able to.

  Moreover, since the lower bracket 11a and the one outer peripheral surface 35 of the base plate 30 are welded by laser welding, the welding time can be shortened as compared with other welding methods such as arc welding.

FIG. 6 is an enlarged cross-sectional view showing a main part of the reclining device 20 according to the first modification of the first embodiment.
As indicated by an arrow α4 in FIG. 6, as a first modification of the first embodiment, welding between the outer peripheral surface 35 on one side of the base plate 30 and the engagement hole 11b of the lower bracket 11a is performed from the other side in the axial direction. You may implement. Thereby, the welding of the one side outer peripheral surface 35 of the base plate 30 and the engagement hole 11b of the lower bracket 11a and the welding of each protrusion 42 of the gear plate 40 and the engagement hole 12b of the upper bracket 12a are performed on the same axis. Since it can be carried out from the other side of the direction (gear plate side), the welding process is simplified compared to the case of welding from both directions, and the welding time can be shortened and the manufacturing cost related to welding can be reduced. .

FIG. 7 is an enlarged cross-sectional view showing a main part of a reclining device 20 according to a second modification of the first embodiment.
As shown in FIG. 7, as a second modification of the first embodiment, the lower bracket 11a is used to increase the contact area between the first cylindrical portion 51 of the cover bracket 50 and the other outer peripheral surface 36 of the base plate 30. The one side outer peripheral surface 35 of the base plate 30 and the engagement hole 11b of the lower bracket 11a are in a state where a part of one side of the engagement hole 11b in the axial direction is not in contact with the one outer peripheral surface 35 of the base plate 30. You may weld from the axial direction one side (refer arrow (alpha) 2 of FIG. 7). In the second modified example, similarly to the first modified example, by performing welding from the other side in the axial direction, the welding time can be shortened and the manufacturing cost related to welding can be reduced.

FIG. 8 is an enlarged cross-sectional view showing a main part of a reclining device 20 according to a third modification of the first embodiment.
As shown in FIG. 8, as a third modification of the first embodiment, the cover bracket 50 is formed on the outer peripheral surface of the base plate 30 including the one outer peripheral surface 35 on the inner peripheral surface of the first cylindrical portion 51. You may form so that it may contact. In this case, with the outer peripheral surface of the first cylindrical portion 51 of the cover bracket 50 engaged with the engagement hole 11b of the lower bracket 11a, the base plate 30, the cover bracket 50, and the lower bracket 11a are It can be welded and joined by laser welding from one side in the axial direction (see arrow α2 in FIG. 8). In the third modified example, similarly to the first modified example, by performing welding from the other side in the axial direction, the welding time can be shortened and the manufacturing cost related to welding can be reduced.

FIG. 9 is an enlarged cross-sectional view showing a main part of a reclining device 20 according to a fourth modification of the first embodiment.
As shown in FIG. 9, as a fourth modification of the first embodiment, a plurality of protrusions 37 are provided on the end surface on one side in the axial direction of the base plate 30, and each of the protrusions 37 is formed on the lower bracket 11a. The outer peripheral surface 35 of the base plate 30 and the end surface on the other side in the axial direction of the lower bracket 11a may be welded from the other side in the axial direction while being engaged with the engaging holes 11c (see arrow α5 in FIG. 7). . As a result, the protrusion 37 and the engagement hole 11c engage with each other, so that positional displacement between the outer peripheral surface 35 of the base plate 30 and the lower bracket 11a during welding is suppressed, so that the welding is performed with high accuracy. Can do.

[Second Embodiment]
Next, a reclining device according to a second embodiment of the present invention will be described with reference to FIG. FIG. 10 is an enlarged cross-sectional view showing a main part of the reclining device 20a according to the second embodiment.
The reclining device 20a according to the second embodiment is mainly different from the reclining device according to the first embodiment in that the base plate 30a and the cover bracket 50a are employed instead of the base plate 30 and the cover bracket 50 described above. Therefore, substantially the same components as those of the reclining device of the first embodiment described above are denoted by the same reference numerals, and description thereof is omitted.

  As shown in FIG. 10, in the reclining device 20a, in order to fix the cover bracket 50a that restricts the relative movement of the base plate 30a and the gear plate 40 in the axial direction relative to the base plate 30a, A clamped portion 38 is formed on the other side in the axial direction by using a half punching process or the like. Since the cover bracket 50a is sandwiched from the axial direction together with the gear plate 40 by the cover bracket 50a, the base plate 30a has a radius equivalent to the above-described base plate 30 by the amount of the sandwiched part 38 provided. The direction is getting bigger.

  The base plate 30a formed in this way is welded to the lower bracket 11a at one outer peripheral surface 35 (see arrow α2 in FIG. 10). For this reason, even in the reclining device 20a according to the second embodiment, the welding location between the base plate 30a and the lower bracket 11a can be moved away from the rotation center. Thereby, with respect to the moment force acting around the center of rotation, the welding strength at the welding location is increased, and the welding strength between the base plate 30a and the lower bracket 11a can be improved.

FIG. 11 is an enlarged cross-sectional view showing a main part of a reclining device 20a according to a first modification of the second embodiment.
As shown in FIG. 11, as a first modification of the second embodiment, a part of one side in the axial direction of the engagement hole 11b of the lower bracket 11a is not in contact with the one outer peripheral surface 35 of the base plate 30. Thus, the outer peripheral surface 35 on one side of the base plate 30 and the engagement hole 11b of the lower bracket 11a may be welded from one side in the axial direction (see arrow α2 in FIG. 11).

In addition, this invention is not limited to said each embodiment and modification, You may actualize as follows.
(1) The base plate is welded to the lower bracket 11a at the outer peripheral surface even when the base plate 30 is formed in another shape without forming the annular protrusion 33 of the base plate 30 or the sandwiched portion 38 of the base plate 30a. By this, the welding strength in a welding location is raised and the welding strength of a base plate and the lower bracket 11a can be improved.

(2) The welding method for welding and joining the base plates 30 and 30a to the lower bracket 11a is not limited to laser welding, and for example, a welding method such as arc welding, spot welding, or seam welding may be employed.

(3) The welding method for welding and joining the first tubular portion 51 to the base plate 30 from the outer peripheral side is not limited to laser welding, and for example, a welding method such as arc welding, spot welding, or seam welding may be employed. .

(4) The forming method for forming the annular projecting portion 33 is not limited to iron forming, and other plastic processing may be employed, or other forming methods such as cutting may be employed. In this case, in the molding method capable of molding the annular protrusion 33 with high accuracy, the gap between the end surface 33a on the other axial side of the annular protrusion 33 and the second cylindrical portion 52 may be eliminated.

DESCRIPTION OF SYMBOLS 10 ... Vehicle seat 11 ... Seat cushion 11a ... Lower bracket (1st bracket)
12 ... Seat back 12a ... Upper bracket (second bracket)
20, 20a ... Reclining device 30, 30a ... Base plate 31, 32 ... Guide convex part (guide part)
33 ... annular protrusion (protrusion)
33a ... End face 35 ... One side outer peripheral surface 36 ... Other side outer peripheral surface 40 ... Gear plate 41 ... Internal teeth 50 ... Cover bracket (cover)
DESCRIPTION OF SYMBOLS 51 ... 1st cylindrical part 52 ... 2nd cylindrical part 61 ... 1st lock gear 61a ... External tooth 62 ... 2nd lock gear 62a ... External tooth 70 ... Cam 80 ... Spring member 90 ... Lever plate X ... Gap

Claims (5)

A reclining device that adjusts a tilt angle between a first bracket and a second bracket that tilt relatively,
A base plate attached to the first bracket;
A gear plate attached to the second bracket and assembled to be rotatable relative to the base plate and having internal teeth;
A lock gear having external teeth that are assembled so as to be movable in a radial direction with respect to a guide portion formed on the base plate, and have external teeth that can mesh with the internal teeth;
A cam that controls movement of the lock gear radially outward to mesh the outer teeth with the inner teeth,
The reclining device, wherein the base plate is attached to the first bracket by being welded to the first bracket at an outer peripheral surface thereof. A state in which the first bracket portion is in contact with the inner surface of the first cylindrical portion with respect to a portion of the outer peripheral surface of the base plate where the first bracket is not welded, and is in sliding contact with the gear plate on the inner surface of the second cylindrical portion. And a cover for holding the base plate and the gear plate so as to be relatively rotatable and suppressing relative movement in the axial direction.
On the outer edge of the base plate, a projecting portion that projects annularly in the axial direction on the other side in the axial direction is formed to be engageable with the outer peripheral surface of the gear plate on the inner peripheral surface thereof
The reclining device according to claim 1, wherein the cover is fixed to the base plate by welding the first cylindrical portion to the base plate from an outer peripheral side. A gap is formed between the end face on the other side in the axial direction of the protrusion and the cover,
The reclining device according to claim 2, wherein the protruding portion is formed by plastic working.   The reclining device according to any one of claims 1 to 3, wherein the welding position of the first bracket and the base plate is provided at a position where welding can be performed from the gear plate side.   The reclining device according to any one of claims 1 to 4, wherein the first bracket and the base plate are welded by laser welding.

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