JP2007061120A - Reclining unit for automotive seat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reclining unit with a differential gearing mechanism for reclining an automotive seat, capable of preventing disengagement and disassembly of internal mechanism parts and preventing penetration and adhesion of dust or litter by adopting a means for closing the internal mechanisms, and capable of being unitized and standardized. <P>SOLUTION: The internal mechanisms such as an operation piece 3a of a rotating shaft 3, wedge plates 5 and 5', and a notched circular spring rod 6, indispensable for fixing the position and for tilting operation of a seat back by the differential gearing mechanism, are disposed on an internal gear A in the reclining unit. An eccentric space 4a among the inner face part A1 of the internal gear A, the outer surface 1b of a center bearing cylinder part of the internal gear A and the inner surface 2C of a bearing ring of an external gear B is closed by a closing plate 11 attached to the external gear B from the direction of opening on the external gear B side. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a reclining unit used for adjusting a tilt angle of an automobile seat, and in particular, an internal gear partially meshed and an external gear having a smaller number of teeth than the internal gear are relatively moved by movement of the meshing portion. The present invention relates to a reclining unit using a so-called differential transmission mechanism that oscillates and rotates.

  The reclining device for adjusting the tilt angle of the automobile seat is unitized into a disk shape from the viewpoint of commonality. As for the differential transmission mechanism, a central shaft cylinder fitted to the rotating shaft in a state in which a disk-shaped external gear and a disk-shaped internal gear having slightly more teeth than the external gear are partially engaged. And a central bearing ring that is eccentric with respect to the central cylinder, and the peripheral side portions of the outer gear are integrally caulked by a bracket in a rotatable state. And the central bearing ring of the internal gear, the eccentric airspace in which the outer direction of the internal gear is opened, the operating flange portion integrated with the rotary shaft, one side surface on the outer peripheral surface of the central shaft of the external gear, and the other side surface A pair of wedge-shaped members that are in contact with the inner peripheral surface of the central bearing ring of the internal gear are arranged in parallel, and each of the wedge-shaped members is a spring that urges each of the wedge-shaped members in the driving-in diameter increasing direction to increase the amount of eccentricity. Are provided, and internal teeth A seat back side bracket having an opening in the eccentric airspace portion is fixed to the outer side surface of the outer gear, and a seat cushion side bracket is fixed to the outer side surface of the external gear (for example, see Patent Document 1). .

JP 2005-21487 A

The unitized reclining device in the above-mentioned document adopts a hinge state like a disc body and can be used on both the left and right sides of an automobile seat, and is made common in order to cope with the bracket shape for each vehicle type. It is.
However, unitization and standardization involve storage in a warehouse until use or shipment to a production factory, and it is impossible to avoid the attachment of dust and debris.
In particular, in the form in the above document, the eccentric shaft portion, which can be said to be an important component of the differential transmission mechanism type, is open to the outside, and dust and dust are likely to adhere to it. This also affects the position fixing and tilting function.
The present invention adopts a differential transmission mechanism, and by taking a means for closing the internal mechanism, the internal mechanism parts are prevented from being detached and disassembled, and dust and dust are prevented from entering and adhering to the unit. A reclining unit that aims to be integrated and shared is provided.

  The reclining unit for an automobile seat that achieves the above-described object includes a rotating shaft and a rotating shaft with a disk-shaped internal gear and a disk-shaped external gear slightly smaller in number than the internal gear partially engaged with each other. The shaft is supported by the eccentric shaft portion with respect to the shaft, and the peripheral side portions thereof are integrally ring-caulked by the bracket in a rotatable state, and the partial engagement portion is moved by the movement of the eccentric shaft portion. In a reclining unit with a differential transmission mechanism that adjusts the tilt angle of the seat back with respect to the seat cushion by relative swinging rotation of the internal gear and the external gear, the internal gear includes a central bearing tube portion, and the external gear The outer gear is rotatably supported by a rotation shaft inserted from the side, and the outer gear has a central hole surrounding the central bearing tube portion of the inner gear, and the eccentric shaft portion is connected to the inner side surface portion of the inner gear and the center. Two wedge plates disposed in an eccentric air space between the outer peripheral surface of the receiving tube portion and the inner peripheral surface of the central hole of the external gear, and the two wedge plates are arranged in opposite circumferential directions. A spring rod that presses the meshing part of the internal gear and the external gear, and is projected from the flange portion formed on the external gear side of the rotary shaft toward the internal side surface portion of the internal gear. Along with the rotation of the rotary shaft, the operating state of the wedge plate is released, and the working piece rotates together with the wedge plate to bring the meshing portion of the internal gear and the external gear into a meshing state suitable for rotation transmission. And a closing plate for closing the opening on the outer gear side of the eccentric shaft portion is attached to the outer side of the outer gear at the outer portion of the flange portion of the rotating shaft. is there.

  The reclining unit according to the present invention includes an inner side surface portion of an internal gear and an outer periphery of a central bearing cylinder portion of the internal gear, which are arranged portions of an eccentric shaft portion that operates to fix and tilt the seat back by a differential transmission mechanism. Since the eccentric air space between the surface and the inner peripheral surface of the bearing ring of the external gear is blocked by a closing plate attached to the external gear from the outside of the rotary shaft flange in the opening direction on the external gear side. Prevents internal mechanism parts that are essential for the removal of the rotating shaft that constitutes the eccentric shaft and the operation piece, wedge plate, and non-circular spring rod from coming off and disassembling, and dust and dirt enter and adhere to it. Since there is no fear, it is also suitable for function deterioration, storage, and transportation to the manufacturing site, and it is beneficial for standardization (unitization).

  The figure shows the Example of the reclining unit of the motor vehicle seat which concerns on this invention, and demonstrates based on each figure below.

  The reclining unit in this example is interposed between the seat cushion side bracket and the seat back side bracket, and adjusts the tilt angle of the seat back with respect to the seat cushion by a so-called differential transmission mechanism. The mechanism is rotatably supported by an internal gear and an external gear having a slightly smaller number of teeth than the internal gear, and is rotatably supported in a partially meshed state by a rotating shaft and an eccentric shaft portion with respect to the rotating shaft. The internal gear and the external gear are relatively swung and rotated by the swiveling movement of the meshing portion accompanying the rotation of the shaft.

  And in this example, the disk-shaped internal gear A in which the internal teeth 1 are formed and the external gear B in which the external teeth 2 having slightly fewer teeth than the internal gear A are arranged in a face-to-face state. In the internal gear A, an integral central bearing tube portion 1a protruding in the direction of the external gear B is rotatably supported on a rotary shaft 3 inserted from the external gear B side. The external gear B is connected to the central hole 2a. The inner gear A and the outer gear B are partially meshed with each other in such a manner that the bearing ring 2b fitted to the shaft is rotatably fitted to the eccentric shaft portion 4 surrounding the central bearing tube portion 1a of the inner gear A. The peripheral side portions of each other are integrally ring-caulked by the bracket 12 in a rotatable state.

  The eccentric shaft portion 4 supporting the external gear B is eccentric corresponding to the difference in the number of teeth between the inner side surface A1 of the internal gear A and the internal gear A and the external gear B facing the external gear B. The outer gear side between the outer peripheral surface 1b of the central bearing tube portion of the internal gear A and the bearing ring inner peripheral surface 2c of the outer gear B is located in the eccentric airspace 4a, and the inner gear when the seat back is tilted differentially. A and the external gear B are brought into an appropriate meshing state having backlash, and when the seat back position is fixed, the operating piece portion 3a and the two wedge plates 5, 5 'and .., Which are provided with a non-circular spring rod 6.

  The operating piece portion 3a in the eccentric shaft portion 4 is formed in the direction of the inner side surface portion A1 of the internal gear A from a flange portion 3g integrally formed on the outer gear B side of the rotary shaft 3 that is the opening side of the eccentric shaft portion 4. The arcuate angle of the outer peripheral side surface portion 3b along the inner peripheral surface 2c of the bearing ring and the inner peripheral side surface portion 3c along the outer peripheral surface 1b of the central bearing cylinder is approximately 150 °, and the eccentric airspace 4a. It arrange | positions in the site | part opposite to the eccentric direction in (eccentric shaft part 4).

  The two wedge plates 5 and 5 ′ have the same shape, and the one wedge plate 5 has an arc shape having the same diameter as the diameter of the inner peripheral surface 2 c of the bearing ring, and the outer side of the arc that slides on the inner peripheral surface 2 c. The surface portion 5a and the arcuate shape slightly larger than the diameter of the outer peripheral surface 1b of the central bearing tube portion, and the substantially crescent plate shape having an arc angle of about 180 ° having an arc inner side surface portion 5b slidably contacting the outer peripheral surface 1b, In the substantially central portion, a locking hole 5c and a circular arc hole 5d of the notch-shaped spring rod 6 are arranged concentrically, and two wedge plates 5 and 5 'having the same diameter are formed as an eccentric air space. 4a (eccentric shaft portion 4) are arranged so as to overlap each other in the direction of the axis 3d of the rotary shaft 3 in the direction opposite to each other with one wedge plate 5 'turned upside down. 5 and 5 'are projected in the direction of the other end surface 5f and 5'f of the overlapped wedge plates 5 and 5', respectively. The dampers 13 and 13 'made of elastic material are attached.

  The notched spring rod 6 has leg collar portions 6a and 6'a that are bent from each end of the missing circle portion at a substantially right angle with respect to the missing circular surface. Of the overlapped wedge plates 5 and 5 ', it is locked in the locking hole 5c of the front wedge plate 5 and is inserted into the circular arc hole 5'd of the back wedge plate 5' and the other leg. The flange portion 6'a is inserted from the arc hole 5d of the front wedge plate 5 and is engaged with the engagement hole 5'c of the rear wedge plate 5 'from the outside of the external gear B. It arrange | positions along the front surface of the bearing ring 2b toward the eccentric shaft part 4. As shown in FIG.

  Thus, each of the two wedge plates 5 and 5 'is caused to pass through the leg flange portions 6a and 6'a that are locked to the locking holes 5c and 5'c by the diameter-enlarging elasticity of the notch-shaped spring rod b. In the fixed state of the seat back shown in the figure, the front wedge plate 5 is biased counterclockwise and the back wedge plate 5 'is biased clockwise. It is driven into the left and right direction positions where the distance between the outer peripheral surface 1b of the central bearing tube portion and the inner peripheral surface 2c of the bearing ring is gradually reduced, and the entire outer surface portions 5a and 5'a of the respective arcuate surfaces of the wedge plates 5 and 5 '. Are in contact with the inner peripheral surface 2c of the bearing ring having the same diameter, and the arc inner side surface portions 5b and 5'b are in contact with the outer peripheral surface 1b of the central bearing tube portion. The dampers 13 and 13 'of the force direction end surface portions 5e and 5'e and the end surface portions 3e and 3'e of the operating piece portion 3a have a slight gap. Are arranged in a state of facing each other.

  In the state when the seat back position is fixed as shown in this figure, between the outer peripheral surface 1b of the central bearing cylinder portion around the rotation shaft 3 and the inner peripheral surface 2c of the bearing ring corresponding to the central hole 2a of the external gear 2. The peripheral surfaces 1b and 2c, that is, the center 3f of the rotating shaft 3 and the center 4b of the eccentric shaft portion 4 are pressed in a direction away from each other on the eccentric direction line (the eccentricity). As a result, the teeth at the meshing sites of the external gear B and the internal gear A are in pressure contact with each other.

  Further, a support disc 10 of a non-circular spring rod 6 is fitted on the outer portion of the flange portion 3g of the rotary shaft 3, and a circular blocking plate 11 is fitted on the outer side of the outer disc B in the eccentric air region 4a. It is attached in a state where it is press-fitted and fixed to a protrusion B2 formed on the outside of the external gear B in such a manner as to close the opening on the side.

  In the reclining unit of this example, as shown in FIG. 1, the seat back side bracket C is fixed to the projection A2 provided outside the internal gear A, and the seat cushion side bracket D is provided outside the external gear B. This is fixed to the projection B2 from the outside of the closing plate 11 attached to the projection B2, and a driving motor 7 is disposed on the rotary shaft 3 at the outer portion of the internal gear A.

The tilting operation of the seat back from the state when the position of the seat back is fixed is by rotating the rotating shaft 3 via the motor 7.
For example, when the rotating shaft 3 is rotated in the clockwise direction, the integral operating piece portion 3a is also rotated in the same direction, and the end surface of the one wedge plate 5 facing the end surface portion 3e in the rotating direction. The wedge plate 5 pressed against the damper 13 attached to the portion 5e and pressed in the driving direction by the notched spring rod 6 by this pressing is counteracted to the circumferential direction (clockwise). In the direction) and the drive is released.

  By the movement of the one wedge plate 5, the pressure-engagement state of the meshing portion is released, and the overlapped wedge plates 5, 5 'are both arcuate via both arc inner side surface portions 5b, 5'b in contact with the central bearing cylinder portion 1b. The entire outer side surface portions 5a and 5'a are in sliding contact with the inner peripheral surface 2c of the bearing ring, and the eccentric shaft portion 4 is eccentrically required for proper meshing (backlash) in smooth rotation transmission of the internal gear A and the external gear B. While maintaining the amount, it rotates with the rotating piece 3 together with the operating piece 3a and the semicircular spring rod 6 along with the rotation.

  As a result, the external gear B pivotally supported by the eccentric shaft portion 4 is rotated, and the seatback side bracket C fixed to the internal gear A by the rotational movement of the meshing portion with the internal gear A accompanying the external gear B is removed. The tilt angle is adjusted with respect to the seat cushion side bracket D fixed to the gear B.

  The reclining unit in this embodiment includes an inner side surface portion of an internal gear and an outer peripheral surface of a central bearing cylinder portion of the inner gear, which are arranged portions of an eccentric shaft portion that operates to fix and tilt the seat back by a differential transmission mechanism. Since the eccentric air space between the outer gear and the inner peripheral surface of the bearing ring is closed by a closing plate attached to the outer gear from the outside of the rotary shaft flange in the opening direction on the outer gear side. Prevents internal mechanism parts that are essential for the removal of the rotating shaft that constitutes the shaft part, operation piece part, wedge plate, notch spring spring, etc. from coming off and disassembling, and dust and dust may infiltrate and adhere Because of this, it is optimal for common functions (unitization) for functional degradation, storage, and transportation to the manufacturing site.

Side surface sectional drawing of a reclining unit. The front view which notched a part. The enlarged front view of an eccentric shaft part. The disassembled perspective view of a reclining unit.

Explanation of symbols

A Internal gear A1 Inner side surface A2 Protrusion B External gear B2 Protrusion C Seat back side bracket D Sort cushion side bracket 1 Internal tooth 1a Central bearing cylinder part 1b Central bearing cylinder part outer peripheral surface 2 External teeth 2a Central hole 2b Bearing ring 2c Bearing ring Inner peripheral surface 3 Rotating shaft 3a Actuating piece portion 3f Center 3g Eaves portion 4 Eccentric shaft portion 4a Eccentric air space 4b Center 5, 5 'Wedge plate 6 Not-circular spring rod 7 Motor 10

Claims (1)

A disk-shaped internal gear and a disk-shaped external gear slightly smaller in number than the internal gear are partially engaged, and are supported by a rotating shaft and an eccentric shaft portion with respect to the rotating shaft. In a rotatable state, the circumferential sides of each other are integrally ring-caulked by the bracket, and by the relative swing rotation of the internal gear and the external gear due to the movement of a part of the meshing portion accompanying the rotation of the eccentric shaft portion, In a reclining unit with a differential transmission mechanism that adjusts the tilt angle of the seat back with respect to the seat cushion,
The internal gear has a central bearing cylinder part rotatably supported on a rotation shaft inserted from the external gear side, and the external gear has a central hole surrounding the central bearing cylinder part of the internal gear,
The eccentric shaft portion includes two wedge plates disposed in an eccentric air space between the inner side surface portion of the internal gear, the outer peripheral surface of the central bearing tube portion, and the inner peripheral surface of the central hole of the outer gear. A spring rod that urges each of the two wedge plates in a driving direction opposite to each other to press-contact the meshing portion of the internal gear and the external gear;
Projecting in the direction of the inner side surface of the internal gear from the flange formed on the outer gear side of the rotary shaft, and releasing the driving state of the wedge plate as the rotary shaft rotates, together with the wedge plate An operation piece portion that rotates to bring the meshing portion of the internal gear and the external gear into a meshing state suitable for rotation transmission,
In addition, the vehicle seat reclining unit is characterized in that a closing plate for closing the opening on the outer gear side of the eccentric shaft portion is attached to the outer side of the outer gear at the outer portion of the flange portion of the rotating shaft.

Images