JP2023152364A - reclining device - Google Patents

Abstract

The present invention provides a reclining device that functions without using a wedge-shaped cam and can stabilize sliding. The reclining device of the present invention includes an external gear 10, an internal gear 20, and an annular shape in which the center of the outer periphery and the center of the inner periphery are eccentric, and the through hole of the external gear 10 is provided. 12, and has a contact point that contacts the cylindrical boss and the through hole 12 on either the left or right in the vertical direction at the center of the cylindrical boss of the internal gear 20. and a second ring 32 , a biasing member 70 that biases the first ring 31 and the second ring 32 in a direction to separate them, a driving member 60 , and a second ring 32 that is fitted into the driving member 60 and is applied via the driving member 60 . A reclining device characterized by comprising: a rotating shaft 40 that rotates a first ring 31. [Selection diagram] Figure 3

Description

The present invention relates to a reclining device.

The right holder claims that in a seat reclining device that holds the seat back tiltably relative to the seat cushion,
a first frame fixed to either one of the seat cushion and the seat back; a second frame fixed to the other of the seat cushion and the seat back;
an external gear connected to the first frame, having external teeth formed on its outer circumferential surface, and having an externally toothed boss portion coaxial with the axial direction on its inner circumferential surface;
an internal gear connected to the second frame, having internal teeth formed on its outer circumferential surface that can mesh with the external teeth, and having a cylindrical boss portion coaxial with the axial direction on its inner circumferential surface;
a rotating shaft that coaxially and rotatably fits into the external gear and causes either the external gear or the internal gear to revolve around the other gear shaft;
The cylindrical boss portion is inserted between the cylindrical boss portion and the external toothed boss portion, and contacts the cylindrical boss portion side and the external toothed boss portion at the same time to restrict rotation of the cylindrical boss portion and the external toothed boss portion. a pair of wedge-shaped cams that slide at least one of the cylindrical boss portion side and the externally toothed boss portion side and allow rotation of the cylindrical boss portion and the external toothed boss portion;
a spring member that urges the pair of wedge-shaped cams to simultaneously contact the cylindrical boss portion side and the externally toothed boss portion side;
A disc-shaped member that rotates as the rotation shaft rotates, extends in the axial direction, and allows the pair of wedge-shaped cams to be moved from at least one of the cylindrical boss portion side and the externally toothed boss portion side in a non-contact manner. a disc-shaped member having a pair of cam pushing wings with a tapered contact surface for pushing in the direction of
A leaf spring that presses the disc-shaped member against the pair of wedge-shaped cams and brings the tapered contact surface into contact with the pair of wedge-shaped cams, the biasing force being greater than that of the spring material. A device including a leaf spring that is set to be weak has been proposed (Patent Document 1).

According to this reclining device, the wedge-shaped cam is directly actuated by the cam pushing blade of the disc-shaped member that is linked to the rotating shaft, so that the rotational resistance between the external gear and the internal gear becomes uniform, and the external gear This has the effect of smoothing the rotation of gears and internal gears.

As described above, conventional reclining devices require a wedge-shaped cam. However, when a wedge-shaped cam is used, there is a problem that the number of parts increases and the cost increases. In addition, when a wedge-shaped cam is used, the contact area with the cylindrical boss part or the externally toothed boss part is reduced, so when a high load force is applied from the outside, it cannot withstand a high load, and sliding The problem was that it got worse.

JP2019-127210A

Therefore, the present invention has been made in view of these problems, and an object of the present invention is to provide a reclining device that functions without using a wedge-shaped cam and can stabilize sliding motion.

In order to achieve the above-mentioned object, the present invention takes the following measures.

The reclining device of the present invention includes:
A seat reclining device that tiltably holds a seat back frame constituting a seat back with respect to a seat cushion frame constituting a seat cushion,
an externally toothed gear that is attached directly or indirectly to one of the seat cushion frame and the seat back frame, has external teeth formed on its outer circumferential surface, and has a cylindrical boss coaxial with the axial direction formed on its inner circumferential surface; ,
It is attached directly or indirectly to the other of the seat cushion frame and the seat back frame, and has internal teeth that can mesh with the external teeth that are provided on the inner peripheral surface at least one more than the external teeth. , and an internal gear formed with a through hole coaxial with the axial direction;
It is arranged between the inner periphery of the through hole of the internal gear and the outer periphery of the cylindrical boss of the external gear, and is formed in an annular shape with the center of the outer periphery and the center of the inner periphery being eccentric, and An engagement hole formed on the meshing direction side of the external gear and the internal gear or on the opposite side to the meshing direction, a first spring hole formed on both sides of the engagement hole, and an insertion hole formed with an elongated hole. A gap is formed between the through hole of the internal gear on the meshing direction side of the external gear and the internal gear and on the opposite side to the meshing direction, and a gap is formed between the through hole of the internal gear and the external gear. When the gear and the internal gear are in a locked state, the cylindrical boss is located either on the left or right in a vertical direction at the center of the cylindrical boss of the external gear with respect to the meshing direction of the external gear and the internal gear. and a first ring having a contact point that contacts the through hole;
The spring hole is disposed on the back side of the first ring, is formed in an annular shape with the center of the outer periphery and the center of the inner periphery being eccentric, and is opposite to the first spring hole with respect to the engagement hole of the first ring. a second spring hole provided on the side, and an insertion protrusion inserted into the engagement hole of the first ring, a side in the meshing direction of the external gear and the internal gear and a side opposite to the meshing direction. A gap is formed between the internal gear and the through hole, and when the external gear and the internal gear are in a locked state, a gap is formed between the external gear and the internal gear in a meshing direction. a second ring having a contact point that contacts the cylindrical boss and the through hole on either the left or right side in a vertical direction at the center of the cylindrical boss of the external gear;
a biasing member whose end portions are inserted into the first spring hole of the first ring and the second spring hole of the second ring, and biases the first spring hole and the second spring hole, respectively, in a direction to separate the first spring hole and the second spring hole; and,
a driving member that is coaxially and rotatably fitted into the cylindrical boss of the external gear and has a fitting hole on the inside and a protrusion that is inserted into the engaging hole of the first ring;
a rotating shaft that fits into the drive member and rotates the first ring or the second ring via the drive member;
It is characterized by having the following.

The present invention uses two rings, each ring has a wedge angle for a different direction of rotation, and by providing a wedge function, the locked state and operating state can be controlled without using a wedge-shaped cam. To provide a reclining device that can be held.

Moreover, in the reclining device according to the present invention,
A seat reclining device that tiltably holds a seat back frame constituting a seat back with respect to a seat cushion frame constituting a seat cushion,
an externally toothed gear that is attached directly or indirectly to one of the seat cushion frame and the seat back frame, has external teeth formed on the outer circumferential surface, and a through hole coaxial with the axial direction formed on the inner circumferential surface; ,
It is attached directly or indirectly to the other of the seat cushion frame and the seat back frame, and has internal teeth that can mesh with the external teeth that are provided on the inner peripheral surface at least one more than the external teeth. , and an internal gear formed with a cylindrical boss coaxial with the axial direction;
It is arranged between the inner periphery of the through hole of the external gear and the outer periphery of the cylindrical boss of the internal gear, and is formed in an annular shape with the center of the outer periphery and the center of the inner periphery being eccentric, and An engagement hole formed on the meshing direction side of the external gear and the internal gear or on the opposite side to the meshing direction, a first spring hole formed on both sides of the engagement hole, and an insertion hole formed with an elongated hole. A gap is formed between the through hole of the external gear and the through hole of the external gear on the meshing direction side of the external gear and the internal gear and on the opposite side to the meshing direction. When the gear and the internal gear are in a locked state, the cylindrical boss is located either on the left or right in a vertical direction at the center of the cylindrical boss of the internal gear with respect to the meshing direction of the external gear and the internal gear. and a first ring having a contact point that contacts the through hole;
The spring hole is disposed on the back side of the first ring, is formed in an annular shape with the center of the outer periphery and the center of the inner periphery being eccentric, and is opposite to the first spring hole with respect to the engagement hole of the first ring. a second spring hole provided on the side, and an insertion protrusion inserted into the engagement hole of the first ring, a side in the meshing direction of the external gear and the internal gear and a side opposite to the meshing direction. A gap is formed between the external gear and the through hole, and when the external gear and the internal gear are in a locked state, a gap is formed between the external gear and the internal gear in a meshing direction. a second ring having a contact point that contacts the cylindrical boss and the through hole on either the left or right side in a vertical direction at the center of the cylindrical boss of the internal gear;
a biasing member whose end portions are inserted into the first spring hole of the first ring and the second spring hole of the second ring, and biases the first spring hole and the second spring hole, respectively, in a direction to separate the first spring hole and the second spring hole; and,
a driving member that is coaxially and rotatably fitted into the cylindrical boss of the internal gear and has a fitting hole inside and a protrusion that is inserted into the engaging hole of the first ring;
a rotating shaft that fits into the drive member and rotates the first ring or the second ring via the drive member;
It is characterized by having the following.

The present invention differs from the above-described invention in that the internal gear is provided with a cylindrical boss and the external gear is provided with a through hole, but similarly, the two rings have a wedge function. Thus, a reclining device can be provided without having a wedge-shaped cam.

FIG. 1 is a schematic diagram of a vehicle seat 200 to which a reclining device 100 according to the first embodiment is attached. FIG. 2 is a front view showing the internal structure of the reclining device 100 according to the first embodiment. FIG. 3 is an exploded perspective view of the reclining device 100 according to the first embodiment. FIG. 4 is a sectional view taken along line AA of the reclining device 100 according to the first embodiment. FIG. 5 is a front view showing the relationship between the first ring 31, the second ring 32, the cylindrical boss 12, and the through hole 22 of the reclining device 100 according to the first embodiment. FIG. 6 is an exploded perspective view of the reclining device 100 according to the second embodiment.

Hereinafter, a reclining device 100 according to an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic diagram of a vehicle seat 200, FIG. 2 is a front view showing the internal structure of the reclining device 100, and FIG. 3 is an exploded perspective view of the reclining device 100. Note that the embodiments and drawings described below illustrate some of the embodiments of the present invention, and are not used for the purpose of limiting the configuration to these. Note that in each figure, corresponding components are given the same or similar symbols. Further, in FIG. 3, the directions indicated by the arrows in the figure are respectively referred to as the "front" and "back".

(First embodiment)
As shown in FIG. 1, the reclining device 100 according to the first embodiment has a seat cushion 210 of a vehicle seat 200, and a seat back 220 that is tiltably attached to the seat cushion 210. This is a device that is attached to the seat back 220 and provides a tilting function to the seat back 220. Specifically, a seat cushion frame arranged inside the seat cushion 210 and a seat back frame arranged inside the seat back 220 are directly or other mounting plates 230 (hereinafter referred to as "mounting plates etc." ”).

The reclining device 100 according to the present invention mainly includes an external gear 10, an internal gear 20, a first ring 31, a second ring 32, a rotating shaft 40, a driving member 60, an attached A spring 70, a plate cover 80, and a shaft locking member 90 are provided as biasing members. Note that in FIG. 2, the rotating shaft 40, the driving member 60, the plate cover 80, and the shaft locking member 90 are omitted to make the internal structure easier to see.

As shown in FIG. 3, the external gear 10 is formed into a disk shape, and external teeth 11 are formed on the outer peripheral surface, and a cylindrical boss 12 is provided in the center, as shown in FIG. ing. The external gear 10 is provided with a protrusion 13, and is attached to the vehicle seat 200 by welding or the like while being fitted into a fitting hole provided in an attachment plate 230 or the like.

The internal gear 20 is formed into a disk shape having a larger diameter than the external gear 10, and has a cylindrical recess formed therein so that the external gear 10 can be mounted inside. Internal teeth 21 (see FIG. 2) are formed on the peripheral surface. The number of internal teeth 21 is at least one more than the number of external teeth 11 of the external gear 10, and as shown in FIG. 10 and the center _C2 of the internal gear ₂₀ mesh with the internal teeth 21 and the external teeth ₁₁ so as to be eccentric as indicated by the arrow d1. Therefore, the external gear 10 and the internal gear 20 form a differential gear, and when the internal gear 20 makes one revolution around the external gear 11, the rotation progresses by the difference between the internal gear 21 and the external gear 11. become. That is, for example, if the external gear 10 is different by only one tooth, when the external gear 10 makes one revolution around the internal gear 20, it will rotate by one tooth. A through hole 22 is provided at the center of the internal gear 20, as shown in FIG. The internal gear 20 is provided with a protrusion 23, and is attached to a vehicle seat by welding or the like while fitting into a fitting hole provided in a mounting plate or the like 230.

The first ring 31 and the second ring 32 are annular members disposed between the inner peripheral surface 22a of the through hole 22 of the internal gear 20 and the outer peripheral surface 12a of the cylindrical boss 12 of the external gear 10. The first ring 31 and the second ring 32 are arranged so as to overlap each other. The first ring 31 is arranged on the front side with respect to the second ring 32. The first ring 31 is provided with an engagement hole 31a on the side in the meshing direction of the external gear 10 and the internal gear 20, or on the opposite side to the meshing direction, into which a protrusion 63 of a drive member 60, which will be described later, is inserted. On both sides there are holes for springs. One of the spring holes is a first spring hole 31b for urging the first ring 31, and the other is an insertion hole 31c for passing a spring for urging the second ring 32. The second ring 32 is made of a curved long hole so that it can move relative to the first ring 31. As shown in FIG. 5, the first ring 31 has an eccentricity d whose outer circumference center _C3 and inner circumference center _C4 are approximately equal to the eccentricity between the center of the external gear 10 and the center of the internal gear 20. ₂ , and a gap d ₃ between the external gear 10 and the internal gear 20 and the through hole 22 of the internal gear 20 is provided on the meshing direction side of the external gear 10 and the internal gear 20 and on the opposite side to the meshing direction. A gap _d4 is formed. Although the eccentricity and gap in FIG. 5 are exaggerated for ease of understanding, in reality, the eccentricity and gap are smaller and the gap is narrower. Further, the first ring 31 is arranged at the center of the cylindrical boss 12 of the external gear 10 with respect to the meshing direction of the external gear 10 and the internal gear 20 when the external gear 10 and the internal gear 20 are in a locked state. It contacts the cylindrical boss 12 and the through hole 22 on either the left or right side in the vertical direction (on the right side in this embodiment), forming a contact point 31d and a contact point 31e, respectively. In this state, the first ring 31 has a wedge angle set at the outer peripheral surface of the first ring 31 with respect to the through hole 22 . Therefore, by rotating the first ring 31 clockwise (rightward), the wedge comes off and the locked state is released. The second ring 32 is disposed on the back surface of the first ring 31, and a second spring hole 32a is provided on the opposite side of the engagement hole 31a of the first ring 31 from the first spring hole 31b. Similarly to the first ring 31, _the second ring 32 also has an eccentricity between the center of the external gear ₁₀ and the center of the internal gear 20, as shown in FIG. The external gear 10 and the internal gear 20 are formed eccentrically so as to be approximately equal to each other, and there is a gap between the through hole 22 of the internal gear 20 on the meshing direction side of the external gear 10 and the internal gear 20, and on the opposite side to the meshing direction. It is formed. Further, the second ring 32 is arranged at the center of the cylindrical boss 12 of the external gear 10 with respect to the meshing direction of the external gear 10 and the internal gear 20 when the external gear 10 and the internal gear 20 are in a locked state. In the vertical direction, the first ring 31 contacts the cylindrical boss 12 and the through hole 22 on the opposite left and right sides via the contact point of the first ring 31 and the cylindrical boss 12, forming a contact point 32d and a contact point 32e, respectively. In this state, the second ring 32 has a wedge angle set at the outer peripheral surface of the second ring 32 at the point of contact with the through hole 22 . Therefore, by rotating the second ring 32 counterclockwise (leftward), the wedge comes off and the locked state is released. In this way, the first ring 31 and the second ring 32 according to the present embodiment have the function of a wedge themselves without using a wedge-shaped cam, and can be used for external gears. 10 and the internal gear 20 can be moved eccentrically to a locked state, and rattling can be prevented from occurring. The second ring 32 has an insertion protrusion 32f that is inserted into the engagement hole 31a of the first ring 31, and has a contact point 32d with respect to the engagement hole 31a of the first ring 31 (the left side in FIG. 5). ). A protrusion 63 of a drive member 60, which will be described later, is inserted into the engagement hole 31a, and the first ring 31 and the second ring 32 are moved via the drive member 60 by rotation of the rotary shaft 40.

The rotating shaft 40 is arranged coaxially and rotatably with respect to the cylindrical boss 12 of the external gear 10. The rotating shaft 40 is rotationally driven when adjusting the tilting of the seatback 220, and has serrations 41 provided on the inner cylinder surface to receive the rotational force of the tilting motor. The rotating shaft 40 has a shaft portion 42 formed in a cylindrical shape so as to be inserted into a driving member 60, which will be described later, and is provided with a plurality of locking portions 43 so as to rotate in synchronization with the driving member 60. There is.

The drive member 60 has a fitting hole 61 provided on its inner periphery so as to fit into the locking portion 43 of the rotating shaft 40, and is rotated as the rotating shaft 40 rotates. Further, the outer peripheral surface of the drive member 60 has a protrusion 63 that is inserted into the engagement hole 31a of the first ring 31. Therefore, the drive member 60 rotated by the rotation of the rotary shaft 40 presses the side surface of the engagement hole 31a of the first ring 31 or the insertion protrusion 32f of the second ring 32 with the protrusion 63, so that the first ring 31 and the second ring 32 can be rotated.

The spring 70 as a biasing member is made of an elastic body, and as shown in FIG. ing. The ends 72a and 72b are inserted into the first spring hole 31b and the second spring hole 32a, respectively, and are biased in the direction in which the first spring hole 31b and the second spring hole 32a are spaced apart, respectively.

The plate cover 80 is a member that fixes the external gear 10, the internal gear 20, the first ring 31, the second ring 32, the rotating shaft 40, the drive member 60, and the spring 70 as an elastic body so that they do not come off. The form is not limited. The shaft locking member 90 is a member that locks the rotating shaft 40.

The reclining device 100 manufactured in this manner operates as follows. When no force is applied to the rotating shaft 40 and it is not rotating, the first ring 31 and the second ring 32 are biased by the spring 70, and the outer peripheral surface 12a of the cylindrical boss 12 of the external gear 10 and the internal gear 20 The inner peripheral surface 22a of the through hole 22 is pressed into contact with the contact point. Therefore, the relative movement between the internal gear 20 and the external gear 10 is locked, and the seat back 220 is in a locked state.

When the rotating shaft 40 is rotated counterclockwise, for example in FIG. 2, from this locked state, the driving member 60 fitted to the rotating shaft 40 rotates, and the rotational force of the driving member 60 is applied to the protrusion. 63 to the side surface of the engagement hole 31a of the first ring 31, causing the first ring 31 to rotate counterclockwise. Due to this rotation, the wedge effect due to the wedge angle formed by the outer circumferential surface and inner circumferential surface of the first ring 31 is removed, and a gap is generated between the first ring 31 and the contact point between the cylindrical boss 12 and the through hole 22. The wedge will come off. As a result, gaps are generated between the first ring 31 and the cylindrical boss 12 and between the first ring 31 and the through hole 22 of the internal gear 20, allowing the external gear 10 to rotate relative to the internal gear 20. . Accordingly, the second ring 32 rotates counterclockwise due to the urging force of the spring 70 so as to fill this gap. In this way, it rotates counterclockwise so as to slide together with the rotating shaft 40, the first ring 31, and the second ring 32. In this way, the external gear 10, the internal gear 20, and the rotating shaft 40 constitute a differential gear mechanism. In addition, in the case of clockwise rotation, the insertion protrusion 32f of the second ring 32 is pressed, and the second ring 32 is rotated clockwise. Due to this rotation, the wedge effect due to the wedge angle formed by the outer circumferential surface and inner circumferential surface of the second ring 32 is removed, and a gap is generated between the second ring 32 and the contact point between the cylindrical boss 12 and the through hole 22. The wedge will come off. As a result, gaps are generated between the second ring 32 and the cylindrical boss 12 and between the first ring 31 and the through hole 22 of the internal gear 20, allowing the external gear 10 to rotate relative to the internal gear 20. . Accordingly, the first ring 31 rotates counterclockwise due to the urging force of the spring 70 so as to fill this gap. In this way, it rotates counterclockwise so as to slide together with the rotating shaft 40, the first ring 31, and the second ring 32.

The reclining device 100 manufactured in this way has the first ring 31 and the second ring 32 formed in a ring shape, so that when an external force is applied to the internal gear 20 or the external gear 10, the reclining device 100 When attempting to move the internal gear 20 or the external gear 10, the direction in which the internal gear 20 or the external gear 10 is intended to move is against the outer peripheral surface 12a of the cylindrical boss 12 of the external gear 10 and the through hole 22 of the internal gear 20. As a result, the first ring 31 and the second ring 32 are sandwiched in a vertical direction, and the component force component can be suppressed to a minimum to serve as a bearing, so that sliding can be stabilized and smooth rotation can be ensured.

Further, since the first ring 31 and the second ring 32 have a function as a wedge, the reclining device 100 can function without using a wedge-shaped cam as in the conventional case.

Further, when the rotating shaft 40 is rotated, it rotates so as to follow the eccentric direction of the internal gear 20 and the external gear 10, and during rotation, the cylindrical boss 12 is rotated by the first ring 31 and the second ring 32. It is brought into contact with most of the outer circumferential surface 12a, and during sliding, the sliding is stabilized and smooth rotation can be ensured.

(Second embodiment)
An exploded perspective view of the reclining device 100 according to the second embodiment is shown in FIG. The reclining device 100 according to the second embodiment is the same except that a through hole 15 is formed in the external gear 10 and a cylindrical boss 25 is provided in the internal gear 20. Therefore, the explanation will be omitted.

As shown in FIG. 6, the external gear 10 is formed into a disk shape, and external teeth 11 are formed on the outer peripheral surface, and a through hole 15 is provided in the center.

The internal gear 20 is formed into a disk shape having a larger diameter than the external gear 10, and has a cylindrical recess formed therein so that the external gear 10 can be mounted inside. Internal teeth 21 are formed on the peripheral surface. The number of internal teeth is at least one more than the number of external teeth 11 of the external gear 10, and the external gear 10 and the internal gear 20 are formed at the center of the external gear 10 and the internal gear 20, respectively. Similar to the first embodiment, the inner teeth 21 and the outer teeth 11 mesh with each other so that the center thereof is eccentric. A cylindrical boss 25 is provided at the center of the internal gear 20, as shown in FIG.

The method for moving the reclining device 100 according to the second embodiment is similar to the first embodiment, when the reclining device 100 is rotated counterclockwise, first, the drive member 60 fitted to the rotation shaft 40 rotates, and the drive member 60 is transmitted from the protrusion 63 to the side surface of the engagement hole 31a of the first ring 31, causing the first ring 31 to rotate counterclockwise. Due to this rotation, the wedge effect due to the wedge angle formed by the outer peripheral surface and the inner peripheral surface of the first ring 31 is removed, and a gap is generated between the first ring 31 and the contact point between the cylindrical boss 25 and the through hole 15. The wedge will come off. As a result, gaps are generated between the first ring 31 and the cylindrical boss 25 and between the first ring 31 and the through hole 15 of the external gear 10, and the external gear 10 becomes rotatable relative to the internal gear 20. . Accordingly, the second ring 32 rotates counterclockwise due to the urging force of the spring 70 so as to fill this gap. In this way, it rotates counterclockwise so as to slide together with the rotating shaft 40, the first ring 31, and the second ring 32. In this way, the external gear 10, the internal gear 20, and the rotating shaft 40 constitute a differential gear mechanism. In addition, in the case of clockwise rotation, the insertion protrusion 32f of the second ring 32 is pressed, and the second ring 32 is rotated clockwise. Due to this rotation, the wedge effect due to the wedge angle formed by the outer peripheral surface and the inner peripheral surface of the second ring 32 is removed, and a gap is generated between the second ring 32 and the contact point between the cylindrical boss 25 and the through hole 15. The wedge will come off. As a result, gaps are generated between the second ring 32 and the cylindrical boss 12 and between the first ring 31 and the through hole 15 of the external gear 10, allowing the external gear 10 to rotate relative to the internal gear 20. . Accordingly, the first ring 31 rotates counterclockwise due to the urging force of the spring 70 so as to fill this gap. In this way, it rotates counterclockwise so as to slide together with the rotating shaft 40, the first ring 31, and the second ring 32.

Note that the present invention is not limited to the embodiments described above, and can be implemented in various forms as long as they fall within the technical scope of the present invention.

As shown in the embodiments described above, the present invention can be mainly used industrially as a reclining device for a vehicle seat.

DESCRIPTION OF SYMBOLS 10... External gear, 11... External tooth, 12... Cylindrical boss, 12a... Outer peripheral surface, 13... Protrusion part, 15... Through hole, 20... Internal gear, 21... Internal tooth, 22... Through hole, 22a... Inside Surrounding surface, 23... Protrusion, 25... Cylindrical boss, 31... First ring, 31a... Engagement hole, 31b... First spring hole, 31c... Insertion hole, 31d... Contact, 31e... Contact, 32... Second ring , 32a...second spring hole, 32d...contact, 32e...contact, 32f...insertion projection, 40...rotating shaft, 41...serration, 42...shaft part, 43...locking part, 60...drive member, 61...fitting Hole, 63... Protrusion, 70... Spring, 71... Annular part, 72a... End, 80... Plate cover, 90... Shaft locking member, 100... Reclining device, 200... Vehicle seat, 210... Seat cushion, 220 ...Seat back, 230...Mounting plate

Claims (2)

A seat reclining device that tiltably holds a seat back frame constituting a seat back with respect to a seat cushion frame constituting a seat cushion,
an externally toothed gear that is attached directly or indirectly to one of the seat cushion frame and the seat back frame, has external teeth formed on its outer circumferential surface, and has a cylindrical boss coaxial with the axial direction formed on its inner circumferential surface; ,
It is attached directly or indirectly to the other of the seat cushion frame and the seat back frame, and has internal teeth that can mesh with the external teeth that are provided on the inner peripheral surface at least one more than the external teeth. , and an internal gear formed with a through hole coaxial with the axial direction;
It is arranged between the inner periphery of the through hole of the internal gear and the outer periphery of the cylindrical boss of the external gear, and is formed in an annular shape with the center of the outer periphery and the center of the inner periphery being eccentric, and An engagement hole formed on the meshing direction side of the external gear and the internal gear or on the opposite side to the meshing direction, a first spring hole formed on both sides of the engagement hole, and an insertion hole formed with an elongated hole. A gap is formed between the through hole of the internal gear on the meshing direction side of the external gear and the internal gear and on the opposite side to the meshing direction, and a gap is formed between the through hole of the internal gear and the external gear. When the gear and the internal gear are in a locked state, the cylindrical boss is located either on the left or right in a vertical direction at the center of the cylindrical boss of the external gear with respect to the meshing direction of the external gear and the internal gear. and a first ring having a contact point that contacts the through hole;
The spring hole is disposed on the back side of the first ring, is formed in an annular shape with the center of the outer periphery and the center of the inner periphery being eccentric, and is opposite to the first spring hole with respect to the engagement hole of the first ring. a second spring hole provided on the side, and an insertion protrusion inserted into the engagement hole of the first ring, a side in the meshing direction of the external gear and the internal gear and a side opposite to the meshing direction. A gap is formed between the internal gear and the through hole, and when the external gear and the internal gear are in a locked state, a gap is formed between the external gear and the internal gear in a meshing direction. a second ring having a contact point that contacts the cylindrical boss and the through hole on either the left or right side in a vertical direction at the center of the cylindrical boss of the external gear;
a biasing member whose end portions are inserted into the first spring hole of the first ring and the second spring hole of the second ring, and biases the first spring hole and the second spring hole, respectively, in a direction to separate the first spring hole and the second spring hole; and,
a driving member that is coaxially and rotatably fitted into the cylindrical boss of the external gear and has a fitting hole on the inside and a protrusion that is inserted into the engaging hole of the first ring;
a rotating shaft that fits into the drive member and rotates the first ring or the second ring via the drive member;
A reclining device characterized by being equipped with. A seat reclining device that tiltably holds a seat back frame constituting a seat back with respect to a seat cushion frame constituting a seat cushion,
an externally toothed gear that is attached directly or indirectly to one of the seat cushion frame and the seat back frame, has external teeth formed on the outer circumferential surface, and a through hole coaxial with the axial direction formed on the inner circumferential surface; ,
It is attached directly or indirectly to the other of the seat cushion frame and the seat back frame, and has internal teeth that can mesh with the external teeth that are provided on the inner peripheral surface at least one more than the external teeth. , and an internal gear formed with a cylindrical boss coaxial with the axial direction;
It is arranged between the inner periphery of the through hole of the external gear and the outer periphery of the cylindrical boss of the internal gear, and is formed in an annular shape with the center of the outer periphery and the center of the inner periphery being eccentric, and An engagement hole formed on the meshing direction side of the external gear and the internal gear or on the opposite side to the meshing direction, a first spring hole formed on both sides of the engagement hole, and an insertion hole formed with an elongated hole. A gap is formed between the through hole of the external gear and the through hole of the external gear on the meshing direction side of the external gear and the internal gear and on the opposite side to the meshing direction. When the gear and the internal gear are in a locked state, the cylindrical boss is located either on the left or right in a vertical direction at the center of the cylindrical boss of the internal gear with respect to the meshing direction of the external gear and the internal gear. and a first ring having a contact point that contacts the through hole;
The spring hole is disposed on the back side of the first ring, is formed in an annular shape with the center of the outer periphery and the center of the inner periphery being eccentric, and is opposite to the first spring hole with respect to the engagement hole of the first ring. a second spring hole provided on the side, and an insertion protrusion inserted into the engagement hole of the first ring, a side in the meshing direction of the external gear and the internal gear and a side opposite to the meshing direction. A gap is formed between the external gear and the through hole, and when the external gear and the internal gear are in a locked state, a gap is formed between the external gear and the internal gear in a meshing direction. a second ring having a contact point that contacts the cylindrical boss and the through hole on either the left or right side in a vertical direction at the center of the cylindrical boss of the internal gear;
a biasing member whose end portions are inserted into the first spring hole of the first ring and the second spring hole of the second ring, and biases the first spring hole and the second spring hole, respectively, in a direction to separate the first spring hole and the second spring hole; and,
a driving member that is coaxially and rotatably fitted into the cylindrical boss of the internal gear and has a fitting hole inside and a protrusion that is inserted into the engaging hole of the first ring;
a rotating shaft that fits into the drive member and rotates the first ring or the second ring via the drive member;
A reclining device characterized by being equipped with.

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