JP2006340873A - Seat reclining device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connecting structure in a round type recliner improving the assembling property by reducing a press-fit load and having no backlash in the rotation direction between a base plate and an external gear. <P>SOLUTION: This seat reclining device is provided with a holder ring 50 superposing the internal gear 20, the external gear 10 and a base plate 30 and clampingly supporting their outer circumferential parts. The base plate 30 is formed with a plurality of internal teeth 37 fitted with external teeth 14 of the external gear 10 in a circular recessed part formed into a half-hollowed shape, and the internal teeth 37 are composed of tooth mold parts 38A press-fitted in the intervals between teeth parts of the external gear 10, and tooth mold parts 38B fitted between tooth parts of the external gear 10 with clearances formed therebetween. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a vehicular seat reclining device, and more particularly to a vehicular seat reclining device having a round type recliner in which a small gear difference internal gear type mechanism is formed in a circular shape.

As can be seen in Patent Documents 1 and 2 below, the round type recliner includes a base plate having a circular protrusion fixed to the seat cushion side mounting arm, and a circular protrusion fixed to the inner teeth and the seat back side mounting arm. An external gear having an internal gear, an external gear fixed to the base plate and meshing with the internal teeth of the internal gear with one or two teeth less than the internal gear, and the external gear and the internal gear A holder that supports the gear in an eccentric state and holds the outer peripheral portion of the cam means for eccentrically driving the internal gear with respect to the external gear and the internal gear, the external gear, and the base plate being overlapped. It consists of a ring.
On the outside of the circular protrusion of the base plate, there is an emboss projection that engages with a through-hole drilled in the seat cushion side mounting arm and is fixed by welding, and on the outside of the circular protrusion of the internal gear, Embossed protrusions are formed which engage with through holes formed corresponding to the cushion side mounting arms and are fixed by welding.
JP 2000-166679 A French additional patent FR-A-2759333 JP2004-229951

  As described above, the round type recliner is configured by sandwiching the external gear between the internal gear and the base plate in a sandwich shape, and the base plate and the external gear are integrated with the external gear on the base plate. A tooth mold part for press-fitting the gear is formed. However, when the external gear is press-fitted into the base plate, the press-fit load varies greatly due to variations in dimensions between the external gear and the tooth mold portion of the base plate. If a slight gap is formed between the two, there is a concern that the gap in the rotational direction is generated by the gap.

  Further, when the wedge type ratchet structure as in Patent Document 3 is provided in the structure of Patent Document 1 or 2, a pair of wedge members, a spring, and a center shaft are connected with the internal gear and the external gear engaged. After assembly, it is necessary to press-fit and fix the base plate to the external gear. Therefore, if the load for press-fitting the base plate and the external gear is high, there is a risk that the press-fitting will be insufficient and a gap will be generated in the width direction, or the base plate and the internal gear may be deformed by the load. .

  Accordingly, the present invention provides a round type seat reclining device for a vehicle that reduces the press-fitting load and improves the assemblability and does not have a backlash in the rotational direction of the base plate and the external gear.

According to a first aspect of the present invention, there is provided a base plate having a circular protrusion fixed to the seat cushion side mounting arm, and an internal tooth formed on an inner peripheral surface of a half-recessed circular recess. And an external gear having a circular protrusion fixed to the seat back side mounting arm, and an external tooth fixed to the base plate and having one or two teeth less than the internal teeth of the internal gear In a seat reclining device comprising: a gear; an eccentric drive means for driving the internal gear eccentrically; and a holder ring that supports the internal gear, the external gear, and the base plate so as to sandwich the outer peripheral portion thereof.
The base plate is formed with a plurality of internal teeth to be fitted with the external teeth of the external gear on the inner peripheral surface of a circular recess formed in a semi-punched shape, and the internal teeth are located between the tooth portions of the external gear. The vehicle seat reclining device is configured by a press-fitted tooth mold part and a tooth mold part fitted with a gap between the tooth parts of the external gear.

  According to a second aspect of the present invention, the vehicular seat reclining device according to claim 1, wherein the press-fitted tooth mold portions are formed at predetermined intervals in at least the circumferential direction of the external gear. did.

  Furthermore, according to claim 3, the tooth mold portion to be press-fitted is formed at three locations at intervals of approximately 120 degrees in at least the circumferential direction of the external gear. The seat reclining device is configured.

  A plurality of internal teeth that fit with the external teeth of the external gear are formed on the internal peripheral surface of the circular recess formed in the half-cut shape of the base plate, and the internal teeth are press-fitted between the tooth portions of the external gear. Because it is composed of a mold part and a tooth mold part fitted with a gap between the tooth parts of the external gear, the press-fit load when the inner teeth of the base plate are press-fitted into the external teeth of the external gear Can be reduced, and play in the rotational direction can be prevented.

  Further, when a large load is input, the load can be received by all the internal teeth to be fitted, and the fixing strength of the base plate and the external gear can be increased. Further, by forming the inner teeth that are press-fitted at an interval of approximately 120 degrees, it is possible to achieve a good balance between press-fitting stabilization, press-fitting load reduction, and play prevention.

  A seat reclining device according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view of the seat reclining device mechanism, FIG. 2 is a component external view of the device mechanism, FIG. 3 is a component inner surface view of the base plate, FIG. 4 is a cross-sectional view taken along line AA of FIG. FIG. 5 shows a state in which the base plate is removed from FIG. 2, and FIG. 6 shows a meshing state between the tooth portion of the base plate and the tooth portion of the external tooth. In the figure, 10 is an external gear having external teeth on the outer periphery of the device mechanism portion, 20 is an internal gear fixed to the seat back side mounting arm 70, 30 is a base plate fixed to the seat cushion side mounting arm 60, 40 Is an eccentric drive means comprising a center shaft 41, a lock plate 46, and a lock spring 47, and 50 is a holder ring surrounding the outer periphery of the stacked internal gear 20, external gear 10, and base plate 30.

  The external gear 10 has a ring shape, an outer peripheral surface on which outer teeth 14 are formed on the entire circumference, an inner peripheral surface in which a metal bearing 15 is press-fitted, and a side surface 13 between the outer peripheral surface and the inner peripheral surface. It consists of.

  The internal gear 20 has a circular concave portion in which a disc is half-cut at the same center, an outer peripheral portion 21 having an outer diameter larger than that of the base plate 30, and a tooth mold portion that forms internal teeth on the inner peripheral surface of the circular concave portion. 22 and an outer protrusion 23 protruding to the opposite side of the circular recess, and the number of teeth of the external gear 10 is one or two less than the number of teeth of the internal gear 20. Therefore, the tooth part outer diameter of the external gear 10 is smaller than the tooth part outer diameter of the internal gear 20. The outer protrusion 23 is formed with six embosses 24 that fit into the mounting holes 61 of the seat back side mounting arm 60, and in the center of the circular recess that rotatably supports the shaft 42 of the center shaft 41. It has a protruding boss 25. The boss 25 is aligned with the center hole 62 formed at the center of the mounting hole 61 of the seat back side mounting arm 60.

  The base plate 30 has a circular concave portion in which a circular plate is half-cut at the same center, an outer peripheral portion 31 having an outer diameter slightly smaller than the internal gear 20, and a tooth mold portion 38 that forms internal teeth on the inner peripheral surface of the circular concave portion. And a circular protrusion 33 protruding to the opposite side of the circular recess, the circular protrusion 33 is formed with an emboss 34 that fits into the mounting hole 71 of the seat cushion side mounting arm 70, and at the center part A center hole 35 that matches the center hole 72 of the seat cushion side mounting arm is formed. On the bottom surface 39 of the circular recess opposite to the circular protrusion 33, a convex portion 36 that protrudes toward the external gear 10 and can contact the side surface 13 is formed as shown in FIGS. 2, 3, and 4. Yes.

  Six convex portions 36 are formed on the side connecting the vertices of the substantially hexagonal second projecting portion 33a that is half-cut from the circular projecting portion 33 in the circumferential direction. Further, the emboss 34 is formed at each of the hexagonal apexes of the second protrusion 33a. The convex portion 36 is formed higher than the chamfer formed between the bottom surface 39 of the circular concave portion and the tooth mold portion 38.

  The external gear 10 is formed to have a thickness slightly smaller than the width obtained by adding the depth of the circular recess of the internal gear 20 and the depth of the circular recess of the base plate 30. This is to prevent a gap from being formed between the external tooth portion 21 of the internal gear 20 and the outer peripheral portion 31 of the base plate 30 when the internal gear 20, the external gear 10, and the base plate 30 are overlapped.

  That is, the press-fitting between the external teeth 14 of the external gear 10 and the tooth mold portion 38 of the base plate 30 is after the eccentric drive means 40 is assembled, so that the one side surface 13 of the external gear 10 and the bottom surface of the base plate 30 Although a gap is left between them, the gap can be reduced by providing the convex portion 36. Further, by providing the convex portion 36, it is possible to provide chamfering between the tooth mold portion 38 and the bottom surface 39 of the base plate 30, thereby relaxing stress concentration and improving the strength of the base plate and the mold life.

  Here, in the press-fitting between the external teeth 14 of the external gear 10 and the tooth mold portion 38 of the base plate 30, the internal teeth 37 of the base plate 30 formed on the tooth mold portion 38 are external gear gears as shown in FIG. The tooth mold part 38A is press-fitted between the 10 tooth parts without a gap, and the tooth mold part 38B is fitted with a gap c between the tooth parts of the external gear 10. The tooth mold portions 38A to be press-fitted are formed at three locations on the inner peripheral surface of the circular recess of the base plate 30 at an interval of approximately 120 degrees. In addition, the press-fitted tooth mold portion 38A has a narrow space between the tooth surfaces to which the external teeth of the external gear 10 are fitted, but it is press-fitted by increasing the tooth width of the internal teeth to be fitted. It may be. The internal teeth 37 are discontinuous with a toothless portion 37a in the circumferential direction, which is to secure a space necessary for forming the embossed protrusions 34. Therefore, the internal teeth 37 may be formed on the entire inner peripheral surface of the circular recess of the base plate 30.

  The center shaft 41 is a cylindrical shaft 42 that is rotatably fitted to the inner peripheral surface of the boss 25 of the internal gear 20, and extends in the radial direction on one end side of the shaft 42. It is formed in a circular arc shape that is inserted into an eccentric space between the flange portion 43 located on the opposite side of the portion 33a, and the boss 25 of the internal gear 20 and the metal bearing 15 press-fitted into the hole of the external gear 10. The two drive projections 45 that can be brought into contact with the tip portions 46a of the two wedge-shaped lock plates 46, and the lock plates that come into contact with the side surfaces of the two internal locking gears 46 formed on the flange portion 43, respectively. It has a lock plate locking portion 44 that prevents the movement of 46 in the pulling direction, and a splined hole 41a into which a control shaft with a spline can be fitted. The two lock plates 46 are slidably disposed in the wide portion of the eccentric space formed between the outer peripheral surface of the eccentric boss 25 and the inner peripheral surface of the metal bearing 15. By pressing in directions away from each other, the eccentricity of the boss 25 and the metal bearing 15, that is, the eccentricity of the internal gear 20 and the external gear 10 is increased.

  Reference numeral 47 denotes an arc-shaped lock spring that urges the two lock plates 46 away from each other. Both end portions 47a are bent at substantially right angles to engage the rear end portions 46b of the two lock plates 46, and the base plate It arrange | positions in the other side recessed part of 30 2nd protrusion part 33a, and is urging | biasing the two lock plates 46 in the direction which mutually spaces apart.

  The holder ring 50 is formed by extending an inner gear holding portion 51 fixed so as to cover the outer periphery of the outer peripheral portion 21 of the internal gear 20 and one end side of the internal gear holding portion 51 in a substantially step shape. And a base plate holding part 52 for preventing the outer peripheral part 31 of the base plate 30 from moving in the axial direction.

  This device mechanism unit fixes the circular protrusion 33 of the base plate 30 to the seat cushion side mounting arm 60, fixes the outer protrusion 23 of the internal gear 20 to the seat back side mounting arm 70, and fixes the center shaft 41 to the motor. It is driven by the drive shaft of the unit. The number of teeth of the external gear 10 is one or two less than the number of teeth of the internal gear 20, and the tooth outer diameter of the external gear 10 is smaller than the tooth outer diameter of the internal gear 20. In order to mesh the internal teeth 22 and the external teeth 14, the centers of the internal gear 20 and the external gear 10 are arranged eccentrically, and by shifting the eccentric position in the circumferential direction, When the meshing position of the external teeth 14 shifts and the meshing position shifts once, the angle shifts by the difference in the number of teeth.

  The meshing position is moved by moving the lock plate 46 driven by the center shaft 41. That is, a pair of lock plates 46 are arranged between the boss 25 of the internal gear 20 and the metal bearing 15 provided at the center of the external gear 10 so that the wedges are bitten by the both ends 47 a of the lock spring 47. The center of the internal gear 20 is eccentric with respect to the center of the external gear 10. When the center shaft 41 is driven, one lock projection 46 is driven and moved by one drive protrusion 45, and the other lock plate 46 is also driven and moved via a lock spring 47.

  The eccentric position shifts in the circumferential direction by the movement of the two lock plates 46. Due to this shift, the meshing between the internal teeth 22 and the external teeth 14 shifts, and the internal gear 20 is shifted in angle by the difference in the number of teeth by one rotation of the center shaft 41. Therefore, by rotating the center shaft 41, the angle of the seat back side mounting arm 70 fixed to the external gear 20 can be adjusted.

  The eccentricity of the center shaft 41 is increased by the lock spring 47 so that the lock plate 46 is urged so that a wedge is inserted between the boss 25 of the internal gear and the metal bearing 15 of the external gear. There is no rattling between the external and internal teeth. Further, by pushing one of the lock plates 46 with the driving projection 45 provided on the center shaft 41, the eccentric position shifts in a state where the wedge does not bite, so that the driving is performed smoothly. The lock plate locking portion 44 of the flange 43 is provided so as to cover the side surface of the lock plate 46 so that the two lock plates 46 do not come off to the base plate 30 side.

  And the assembly of the reclining device mechanism portion is arranged such that the external gear 10 is disposed in the circular recess of the internal gear 20 so that the external teeth 14 of the external gear 10 mesh with the internal teeth 22 of the internal gear 20, Next, the two lock plates 46 are arranged in the wide side space between the boss 25 of the internal gear 20 and the metal bearing 15 of the external gear 10. Next, the shaft 42 of the center shaft 41 is inserted into the boss 25 so that the drive protrusion 45 of the center shaft 41 is inserted into the narrow side space between the boss 25 of the internal gear 20 and the metal bearing 15 of the external gear 10. Insert into the inner peripheral surface. Next, both end portions 47a of the lock spring 47 are inserted and assembled between the rear end portions 46b of the lock plate 46 at positions where the flange 43 is cut out.

  In this state, the base plate 30 is placed on the circular recess of the internal gear 20, and the internal teeth of the tooth mold portion 38 of the base plate 30 are press-fitted into the external teeth 14 of the external gear 10.

  At this time, a tooth mold portion 38 in which the internal teeth of the base plate are press-fitted into the external teeth 14 of the external gear 10, and a tooth mold portion 38 B fitted with a gap between the tooth portions of the external gear 10. Since it comprises, the press-fit load at the time of press-fitting the internal teeth of the base plate 30 into the external teeth 14 of the external gear 10 can be lowered, and the occurrence of play in the rotational direction can be prevented. Further, by forming the inner teeth that are press-fitted at an interval of approximately 120 degrees, it is possible to achieve a good balance between press-fitting stabilization, press-fitting load reduction, and play prevention.

  Finally, the holder ring 50 holds the base plate 30 and the outer peripheral portion of the internal gear 20 to complete.

  When a large load is input, the load can be received by all the internal teeth to be fitted, and the fixing strength of the base plate and the external gear can be increased.

It is a disassembled perspective view of the vehicle seat reclining device mechanism part which implemented this invention. It is an external view by the side of the baseplate in a round type recliner. It is a component inner surface figure of a base plate. It is AA sectional drawing of FIG. It is the figure which removed the base plate from FIG. It is a top view which shows the engagement state of the external gear which engages with the tooth-type part of a baseplate.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... External tooth gear 13 ... Side surface 14 ... External tooth 20 ... Internal tooth gear 30 ... Base plate 36 ... Convex part 37 ... Base plate internal tooth 38 ... Tooth type part 38A ... Press-fitted tooth type part 38B ... With a gap Fitting tooth part 40 ... eccentric drive means 41 ... center shaft 46 ... lock plate 47 ... lock spring 50 ... holder ring 60 ... seat cushion side mounting arm 70 ... seat back side mounting arm

Claims (3)

An internal tooth having a base plate having a circular protrusion to be fixed to the seat cushion side mounting arm, an internal tooth formed on the inner peripheral surface of the circular recess formed in a half-cut shape, and a circular protrusion to be fixed to the seat back side mounting arm An external gear having a gear, an external tooth fixed to the base plate and having one or two teeth less than the internal teeth of the internal gear, an eccentric drive means for driving the internal gear eccentrically, In a seat reclining device comprising a tooth ring, an external gear, and a holder ring that supports the base plate so as to overlap and sandwich the outer periphery thereof,
The base plate is formed with a plurality of internal teeth to be fitted with the external teeth of the external gear on the inner peripheral surface of a circular recess formed in a semi-punched shape, and the internal teeth are located between the tooth portions of the external gear. A vehicle seat reclining device comprising: a tooth mold part to be press-fitted and a tooth mold part fitted with a gap between the tooth parts of the external gear. The vehicle seat reclining device according to claim 1, wherein the press-fitted tooth mold portions are formed at predetermined intervals in at least a circumferential direction of the external gear. 2. The vehicle seat reclining device according to claim 1, wherein the press-fitted tooth mold portions are formed at three locations at intervals of approximately 120 degrees in at least the circumferential direction of the external gear.

Images