JP2020065647A - Reclining device - Google Patents

Abstract

To provide a reclining device which is capable of obtaining stable lock strength and in which generation of unlocking sound is reduced.SOLUTION: A reclining device has a main pole 42 and a sub pole 41. When the main pole 42 and the sub pole 41 are at a lock position, external teeth and internal teeth 23 of the main pole 42 are in a complete engagement state, and external teeth 41a of the sub pole 41 and the internal teeth 23 are in a soft-biting state. The main pole 42 has: a main pole external teeth part 110 having first external teeth 101 on which forward load operates and second external teeth 102 on which rear load operates. The sub pole 41 has a sub pole external teeth part 120 having third external teeth 103 on which the forward load operates and fourth external teeth 104 on which the rear load operates. The cut degree of the main pole external teeth part 110 is greater than the cut degree of the sub pole external teeth part 120.SELECTED DRAWING: Figure 11

Description

  The present invention relates to a reclining device.

  As an example of the reclining device, a cylindrical first member having a bottom with inner teeth formed along the circumferential direction on the inner cylindrical surface and one surface being an open surface, and outer teeth capable of meshing with the inner teeth And a sub-pole having outer teeth capable of meshing with the inner teeth, and a sub-pole laminated on the open surface side of the first member, and provided so as to be rotatable relative to the first member in the circumferential direction. A second member formed with a pole guide that guides the main pole and the sub-pole between the lock position where the outer teeth mesh with the inner teeth, the unlock position where the outer teeth are separated from the inner teeth, Between the first member and the second member, rotatably provided, a cam for pushing the main pole and the sub-pole in the lock position direction, and provided between the cam and the main pole, the lock is provided. In the position it is pushed by the cam, A main pole and a second cam that comes into contact with the pole guide, and when the main pole and the sub pole are in the lock position, the outer teeth of the main pole and the inner teeth of the first member Is completely meshed with each other, the outer teeth of the sub-pole and the inner teeth of the first member are loosely meshed, and relative rotation between the first member and the second member is prohibited.

  Then, when the main pole and the sub pole are moved to the lock position by the cam, the outer teeth of the pair of main poles and the inner teeth of the second member are in complete meshing state (meshing state without play), and The outer teeth and the inner teeth of the second member are in a loosely meshed state (a meshed state with play).

  Normal lock strength is obtained by the meshing of the outer teeth of the main pole and the inner teeth of the second member in the completely meshed state. When a large load acts on the reclining device, the outer teeth of the sub-pole are pressed against the inner teeth of the second member, so that the lock strength is increased (for example, see Patent Document 1).

Japanese Patent No. 5635435

  However, in the reclining device described in Patent Document 1, when unlocking is performed, an unlock sound is generated when the outer teeth of the main pole are disengaged from the inner teeth and when the outer teeth of the sub-pole are disengaged from the inner teeth. Sometimes.

  The present invention has been made in view of the above problems, and an object thereof is to provide a reclining device in which stable lock strength is obtained and generation of an unlock sound is reduced.

To achieve at least one of the above-mentioned problems, a reclining device that reflects one aspect of the present invention is:
Inner teeth are formed on the inner cylindrical surface along the circumferential direction, and one surface is a bottomed cylindrical first member having an open surface,
A main pole having external teeth capable of meshing with the internal teeth,
A subpole having external teeth capable of meshing with the internal teeth,
The lock member is laminated on the open surface side of the first member and is rotatable relative to the first member in the circumferential direction, and the lock position where the outer teeth mesh with the inner teeth and the outer teeth are the inner teeth. A second member formed with a pole guide for guiding the main pole and the sub pole between the unlock positions separated from
A cam that is rotatably provided between the first member and the second member and that pushes the main pole and the sub pole in the lock position direction,
Have
When the main pole and the sub pole are in the locked position, the outer teeth of the main pole and the inner teeth of the first member are in a complete meshing state, and the outer teeth of the sub pole and the first member A reclining device in which the internal teeth are in a chewed state and relative rotation of the first member and the second member is prohibited,
The first member is provided on either one of the seat cushion and the seat back, and the second member is provided on the other one,
The main pole has a main pole external tooth portion having a first external tooth on the side in which the seat back is tilted forward, and a second external tooth on the side in which the seat back is tilted backward,
The sub-pole has a sub-pole external tooth portion having a third external tooth on the side of the seat back that is tilted forward, and a fourth external tooth on the side of the seat back that is tilted rearward,
When the degree of cutting is defined by the angle between the cut tooth surface and the radial line passing through the center of multiple external teeth, or the number of cut tooth surfaces,
A reclining device in which the degree of cutting of the outer tooth portion of the main pole is larger than the degree of cutting of the outer tooth portion of the sub pole.

  Other features of the present invention will become more apparent from the modes for carrying out the invention described below and the accompanying drawings.

  According to the reclining device of the present invention, there is provided a reclining device in which a stable lock strength is obtained and the generation of an unlocking sound is reduced.

  Other effects of the present invention will become more apparent from the modes for carrying out the invention described below and the accompanying drawings.

It is an exploded perspective view of the reclining device of this embodiment. It is the exploded perspective view which looked at the exploded perspective view of FIG. 1 from the reverse direction. It is a figure explaining the unlocked state by the plan view seen from the arrow III direction in the state which removed a part of 1st member, a spring, and a release plate from the reclining device of FIG. It is a figure explaining the state where the external teeth of the sub-pole started to mesh with the internal teeth of the ratchet from the state of FIG. It is a figure explaining the state where the external tooth of the main pole began to mesh | engage with the internal tooth of the ratchet from the state of FIG. It is a figure explaining the state which the external tooth of the main pole completely meshed with the internal tooth of the ratchet from the state of FIG. It is a top view of the cam of FIG. It is a top view of the main pole of FIG. It is a figure explaining the sub-pole of FIG. It is a block diagram of the seat in which the reclining device of this embodiment was provided. It is a figure explaining the external tooth of a main pole. It is a figure explaining a 1st external tooth. It is a figure explaining the 2nd external tooth. It is a figure explaining the external tooth of a sub-pole. It is a figure explaining a 3rd external tooth. It is a figure explaining the 4th external tooth.

Embodiments will be described with reference to the drawings.
First, the seat provided with the reclining device of the present embodiment will be described with reference to FIG. The seat 1 includes a seat cushion 2 that supports the buttocks of a seated person, and a seat back 3 that is tiltable in the front-rear direction with respect to the seat cushion 2 and that supports the back of the seated person. A reclining device 4 is provided on the rotation axis (O) of the tilt of the seat back 3 and permits / prohibits the tilt of the seat back 3.

  Further, the reclining device 4 can be tilted from the front tilted state to the rear tilted state. The tilting of the seat back 3 can be permitted / prohibited from the first-stage locked state to the rearward-tilted state and in the forward-tilted state, but the lock release holding mechanism is allowed from the first-stage locked state to the forward-tilted state. As a result, the unlocked state is maintained, and the seat cushion can be tilted without operating the operation lever.

The reclining device of this embodiment is provided on the left and right sides of the seat and has the same structure. Therefore, the reclining device 4 on one side will be described below.
The reclining device 4 will be described with reference to FIGS. 1 to 9. 1 is an exploded perspective view of the reclining device of this embodiment, FIG. 2 is an exploded perspective view of the reclining device of FIG. 1 seen from the opposite direction, and FIG. 3 is a part of a first member and a spring from the reclining device of FIG. In the state where the release plate is removed, the plan view seen from the direction of arrow III is used to explain the unlocked state. FIG. 4 shows the state in which the outer teeth of the sub-pole start to mesh with the inner teeth of the ratchet from the state of FIG. FIG. 5 is a diagram for explaining a state in which the outer teeth of the main pole have started to mesh with the inner teeth of the ratchet from the state of FIG. 4, and FIG. 6 is a diagram of FIG. 6 in which the outer teeth of the main pole are completely inside the ratchet from the state of FIG. 7 is a plan view of the cam of FIG. 1, FIG. 8 is a plan view of the main pole of FIG. 1, and FIG. 9 is a plan view of the sub-pole of FIG. 1.

  As shown in FIGS. 1 and 2, the ratchet (first member) 21 provided on the seat back 3 side is a bottomed cylindrical shape obtained by half-pressing a disk-shaped plate material by pressing, and a circular recess 21a is formed therein. ing. Inner teeth 23 are formed on the entire inner circumferential surface of the circular recess 21a in the circumferential direction. Further, at the center of the circular recess 21a, a through hole 21b is formed in which a shaft (not shown) arranged along the rotation axis of the seat back 3 (axis O in FIGS. 1 and 2) is loosely inserted. Has been done. The cross-sectional shape of the shaft (not shown) of the present embodiment is not circular (the cross-sectional shape is oval in the present embodiment).

  Similarly to the ratchet 21, the base plate (second member) 25 provided on the seat cushion 2 side is also formed by half-pressing a disk-shaped plate material by pressing to form a circular recess 25a. The diameter of the circular recess 25a is set to be slightly larger than the outer diameter of the ratchet 21. The ratchet 21 is fitted into the circular recess 25a so that the base plate 25 and the ratchet 21 can rotate relative to each other. Further, at the center of the base plate 25, a through hole 25b through which a shaft (not shown) is loosely inserted is formed.

The outer peripheral portion of the ratchet 21 and the outer peripheral portion of the base plate 25 are sandwiched by a ring-shaped outer peripheral ring 27, and the ratchet 21 and the base plate 25 are relatively rotatable without being separated in the relative rotation axis O direction. Is held.
A cam 31 is arranged in a space formed by the circular recess 21a of the ratchet 21 and the circular recess 25a of the base plate 25. At the center of the cam 31, a hole (an oval shape in the present embodiment) 31a into which a shaft (not shown) is fitted is formed. Then, the shaft (not shown) and the cam 31 rotate together. Therefore, the shaft (not shown) is a transmission member that transmits the movement of the cam 31 of one of the reclining devices provided on both sides of the seat to the cam of the other reclining device. Further, the cam 31 is formed with two protrusions 31c protruding in the ratchet 21 direction. Further, as shown in FIG. 7, on the outer peripheral portion of the cam 31, in the clockwise direction in FIG. 7, two first protrusions 31d, second protrusions 31e, third protrusions 31g having the same shape, and the same protrusion 31g are formed. The two first protrusions 31d, the second protrusions 31e, and the third protrusions 31g are formed in this order. Further, two holes 31f into which two wire-working springs 51 to be described later are engaged are formed so as to be connected to the holes 31a of the cam 31.

  A release plate 33 is arranged between the cam 31 and the circular recess 21 a of the ratchet 21. The release plate 33 is formed with a hole 33a with which the two protrusions 31c of the cam 31 are engaged. The engagement between the protrusion 31c and the hole 33a causes the cam 31 and the release plate 33 to rotate integrally. A hole 33e is formed in the center of the release plate 33.

  Between the release plate 33 and the circular recess 25a of the base plate 25, four poles, that is, two sub-poles 41 and two main poles 42 are alternately arranged along the circumferential direction about the axis O. Has been done. In the present embodiment, the sub pole 41 and the main pole 42 are arranged at a pitch of approximately 90 ° in the circumferential direction centered on the axis O. That is, the sub-pole 41 is diagonally arranged in the front-rear direction and the main pole 42 is diagonally arranged in the vertical direction.

Outer teeth 41a and outer teeth 42a that can mesh with the inner teeth 23 are formed on the surfaces of the sub pawl 41 and the main pole 42 that face the inner teeth 23. Details of the outer teeth 42a of the main pole 42 and the outer teeth 41a of the sub pole 41 will be described later with reference to FIGS. 11 to 16.
Further, a second cam 44 is arranged between the main pole 42 and the cam 31.
As shown in FIG. 9, the two first projections 31d of the cam 31 can be brought into contact with the surface of the sub-pole 41 opposite to the surface on which the external teeth 41a are provided. The contact portion 41b is formed.

Further, as shown in FIG. 8, on the surface of the main pole 42 opposite to the surface on which the outer teeth 42a are provided, the first contacted portion 42b with which the second cam 44 can contact and the cam 31 are provided. A second contacted portion 42c with which the third protrusion 31g can contact is formed.
As shown in FIGS. 3 to 6, the second cam 44 has a first contacted portion 44d with which the second protrusion 31e of the cam 31 can abut, and a pole guide protrusion (pole guide) 37 described later. And a first contact portion 44b that can contact the first contacted portion 42b of the main pole 42.

In the circular recess 25a of the base plate 25, four pole guide protrusions 37 are formed at a 90 ° pitch along the circumferential direction of a circle centered on the axis O of relative rotation.
In the present embodiment, as shown in FIG. 7, the circumferential surface of the first protrusion 31d of the cam 31 (the surface that pushes the sub-pole 41) is a circumferential surface of a circle centered on the rotation center of the cam 31. . That is, the first protrusion 31d, which is the surface of the cam 31 that presses the sub-pole 41, has a constant distance from the rotation axis of the cam 31.

  Next, the peripheral surface of the second protruding portion 31e of the cam 31 and the peripheral surface of the third protruding portion 31g are surfaces that intersect the circumference of a circle centered on the rotation center of the cam 31. The surface is set so that the distance from the center of rotation of the cam 31 increases when 31 rotates in the direction of arrow T. That is, the distance between the surface of the cam 31 that presses the second cam 44 and the surface that presses the main pole 42 is such that the distance from the rotation axis of the cam 31 gradually increases toward the lock position.

The cam 31, the sub pole 41, and the main pole 42 are formed so as to perform the following operations.
When the cam 31 rotates in the direction of the arrow T, first, the outer teeth 41a of the sub-pole 41 start to mesh with the inner teeth 23 of the ratchet (first member) 21, and then the outer teeth 42a of the main pole 42 move inside the ratchet 21. Begins to mesh with teeth 23. After that, the main pole 42 is continuously pushed by the cam 31 toward the inner teeth 23, but the sub pole 41 is not pushed toward the inner teeth 23 and stays at that position. Then, in the lock position, the cam 31 pushes the main pole 42 and the second cam 44 pushes the main pole 42, so that the outer teeth 42a of the main pole 42 and the inner teeth 23 of the ratchet 21 are in a completely meshed state (playing state). The outer tooth 41a of the sub-pole 41 and the inner tooth 23 of the ratchet 21 are in a loose mesh state (a mesh state with play).

In other words, when the main pole 42 and the sub pole 41 are moved from the unlocked position to the locked position by the cam 31, the outer teeth 41a of the sub pole 41 are set to the inner teeth of the ratchet 21 before the main pole 42 is completely meshed. 23 starts to mesh.
In addition, in the present specification, when the outer teeth 42a of the main pole 42 and the outer teeth 41a of the sub-pole 41 are engaged with the inner teeth 23 of the ratchet (first member) 21, a play (gap) that cannot move in the locking direction and the unlocking direction is generated. ) Is a completely meshed state, and a meshed state in which there is play (gap) that allows some movement in the locking and unlocking directions is called a loose meshing state.

  The two adjacent pole guide protrusions 37 allow the sub-pole 41 and the main pole 42 to move only in the radial direction of a circle about the axis O of relative rotation. That is, the pole guide projection 37 has a locked position where the outer teeth 41a and the outer teeth 42a mesh with the inner teeth 23 of the ratchet 21, and an unlocked position where the outer teeth 41a and the outer teeth 42a are separated from the inner teeth 23 of the ratchet 21. In between, the sub pole 41 and the main pole 42 are guided.

  Projections 41d and 42d projecting toward the release plate 33 are formed on the surfaces of the sub pole 41 and the main pole 42 that face the release plate 33. The release plate 33 is formed with a cam hole 33b with which the projection 41d of the sub pole 41 and the projection 42d of the main pole 42 engage. The cam hole 33b is formed with an inclined surface on which the projection 41d of the sub pole 41 and the projection 42d of the main pole 42 come into contact, and the release plate 33 is locked in the direction opposite to the arrow T direction in FIGS. When rotated, the sub-pole 41 and the main pole 42 are moved along the pole guide protrusion 37 in a direction (the unlock position direction) in which the outer teeth 41a of the sub-pole 41 and the outer teeth 42a of the main pole 42 are separated from the inner teeth 23 of the ratchet 21. The shape is set to move.

Between the release plate 33 and the circular recess 21a of the ratchet 21, two wire-working springs 51 curved in a substantially C shape are arranged.
Two adjacent pole guide protrusions (pole guides) 37 provided so as to sandwich the side portions of the sub pole 41 and the main pole 42 respectively have sub pole guides facing one side portion of the sub pole 41 and the main pole 42, respectively. 37a and a main pole guide 37b facing the other side of the sub pole 41 and the main pole 42 are formed.

Further, in the present embodiment, the strength of the pole guide protrusion 37 is set to be lower than the strength of the sub pole 41.
Then, when the ratchet 21 rotates due to the large load that has entered the seat back 3 on the surface of the sub pole 41 that faces the sub pole guide 37a and the main pole guide 37b, when the sub pole 41 is pressed against the pole guide protrusion 37, A recess 41h into which the meat of the pole guide protrusion 37 can enter is formed.

  As shown in FIG. 9, the recess 41h is deeper on the external teeth 41a side than on the cam 31 side. Then, when the large load acts, the flesh of the pole guide projection 37 that has entered the recess 41h comes into contact with the outer tooth 41a side of the recess 41h, and a pressing portion 41i that prevents the sub-pole 41 from moving in the unlocking direction is provided. Has been formed.

  The sub-pole guide 37a facing one side of the main pole 42 has a recess 37f that forms a space between the sub-pole guide 37a and one side of the main pole 42. In the present embodiment, the main pole guide 37b facing the other side portion of the main pole 42 is also formed with a recess 37f 'that forms a space between the other side portion of the main pole 42.

A first end 51a bent to the base plate 25 side is formed on one end side of the two wire-working springs 51, and a second end 51a bent to the base plate 25 side is formed on the other end side. The end portion 51b is formed.
Then, in the elastically deformed state of the wire-working spring 51, its first end portion 51a passes through the hole 33e of the release plate 33, engages with the hole 31f formed in the cam 31, and the second end portion 51b becomes , Is inserted into the recess 37f of the sub pole guide 37a.

  Due to the elastic repulsive force of the wire-working spring 51, the first end 51a of the wire-working spring 51 presses the inner wall surface of the hole 31f of the cam 31, and the cam 31 causes the first projection 31d, the second projection 31e, The direction in which the third protrusion 31g faces the first contacted portion 41b of the sub pole 41, the second contacted portion 42c of the main pole 42, and the first contacted portion 44d of the second cam 44 (one Direction).

  The second end portion 51b inserted into the recess 37f of the sub pole guide 37a presses one side portion of the main pole 42, and the main pole 42 faces the other side portion of the main pole 42 in the direction of the main pole guide 37b. Is pressed against. In the present embodiment, the wire-working spring 51 always presses the main pole 42 against the main pole guide 37b facing the other side portion of the main pole 42 during each movement of the locked state ← → the unlocked state. There is.

  In the present embodiment, the second end 51b of the wire-working spring 51 and the recess 37f of the pole guide protrusion 37 are fitted (inserted) to each other so that the second end 51b of the wire-working spring 51 directly contacts the main pole. One side of 42 is pressed and biased. A space (gap) exists on the surface side opposite to the pressing surface of the second end portion 51b of the wire work spring 51, and the second end portion 51b of the wire work spring 51 has a biasing force in a direction different from the biasing force. When a force is applied, the second end portion 51b is movable in a direction in which it is separated (separated) from one side portion of the main pole 42.

  When the sub pole 41 and the main pole 42 are in the lock position, the second cam 44 receiving the force F from the cam 31 moves the main pole 42 in the lock position direction by the component force F ′ of the force F as shown in FIG. While pushing, the main pole 42 is pushed against the main pole guide 37b of the pole guide protrusion 37. The second cam pushes the sub pole guide 37a of the pole guide protrusion 37 with the component force F ″ of the force F.

Here, the operation of the reclining device having the above configuration will be described.
(When moving the sub pole and main pole from the locked position to the unlocked position)
Normally, as shown in FIG. 6, the elastic repulsive force of the wire-working spring 51 causes the sub pole 41 and the main pole 42 provided on the base plate 25 via the cam 31 to have the outer teeth 41a and the outer teeth 42a, and the ratchet 21. Is in a locked position where it meshes with the inner teeth 23 of the vehicle, relative rotation between the ratchet (first member) 21 and the base plate (second member) 25 is prohibited, and the seat back cannot rotate with respect to the seat cushion (locked state). )It is in.

  When the cam 31 is operated against the urging force of the wire-working spring 51 and rotated in the other direction (the direction opposite to the arrow T), the engagement between the protrusion 31c of the cam 31 and the hole 33a of the release plate 33. Due to the relationship, the release plate 33 also rotates together. At this time, the first contact portion 41b of the sub-pole 41 by the first protrusion 31d of the cam 31 and the second contact portion 44d of the second cam 44 by the second protrusion 31e of the cam 31 are pressed against the first contact portion 44d. The pressing of the main pole 42 against the second contacted portion 42c by the third protrusion 31g of 31 is released.

Further, when the release plate 33 rotates, the inclined surface of the cam hole 33b of the release plate 33 with which the projection 41d of the sub pole 41 engages causes the sub pole 41, the main pole 42 (and the second cam 44) to move to the outer teeth 41a, The outer teeth 42a and the inner teeth 23 of the ratchet 21 move to the unlocked position where the meshing is released, and the relative rotation between the ratchet (first member) 21 and the base plate (second member) 25 is changed as shown in FIG. The seat back is rotatable with respect to the seat cushion (unlocked state). At this time, the main pole 42 is pressed against the main pole guide 37b by the second end 51b of the wire-working spring 51. (When moving the sub pole and main pole from the unlocked position to the locked position)
When the operating force applied to the cam 31 is released in the unlocked state shown in FIG. 3, the cam 31 and the release plate 33 rotate in the arrow T direction by the urging force of the wire working spring 51.

  First, as shown in FIG. 4, at least one of the two first protrusions 31 d of the cam 31 presses the two first abutted portions 41 b of the sub-pole 41, and the outer teeth 41 a of the sub-pole 41 are inside the ratchet 21. Begins to mesh with teeth 23. The term "beginning of meshing" here means a state in which the outer teeth and the inner teeth begin to overlap each other in the circumferential direction.

  When the cam 31 further rotates, as shown in FIG. 5, the third protrusion 31g of the cam 31 presses the second contacted portion 42c of the main pole 42, and the outer teeth 42a of the main pole 42 cause the ratchet 21 to move. The internal teeth 23 start to mesh with each other. The second protrusion 31e of the cam 31 also starts to press the first contacted portion 44d of the second cam 44, but the second contact 44b of the second cam 44 has its first contacted portion 44b contacted by the main pole 42. The contact portion 42b is not pressed.

  When the cam 31 further rotates, as shown in FIG. 6, the third protrusion 31g of the cam 31 presses the main pole 42 against the second contacted portion 42c and the second contact of the second cam 44 with the first contact portion. The outer teeth 42a of the main pole 42 and the inner teeth 23 of the ratchet (first member) 21 are completely meshed with each other by the pressing of the main pole 42 against the first contacted portion 42b by 44b, and the outer teeth of the sub-pole 41 are 41a and the inner teeth 23 of the ratchet (first member) 21 are in a loose mesh.

  More specifically, the two first protrusions 31d, which are the surfaces that push the two first contacted portions 41b of the sub-pole 41 of the cam 31, have a constant distance from the rotation axis of the cam 31. Then, in the locked state shown in FIG. 6, no matter how much the cam 31 is rotated in the direction of the arrow T, the outer teeth 41a of the sub-pole 41 and the inner teeth 23 of the ratchet (first member) 21 are in a loose mesh state. The shapes of the cam 31, the sub pole 41 are set. Incidentally, in FIG. 6, the sub-pole 41 also looks like a state of being completely meshed with the inner teeth 23, but in reality, a play (gap) is provided so that the sub-pole 41 can move a little in the locking and unlocking directions.

  Further, the second protrusion 31e, which is the surface that pushes the second cam 44 of the cam 31, and the third protrusion 31g, which is the surface that pushes the main pole 42, form a contact with the rotation axis of the cam 31 as the lock 31 moves toward the lock position. The distance is gradually increasing. Therefore, by rotating the cam 31 in the direction of the arrow T, the outer teeth 42a of the main pole 42 and the inner teeth 23 of the ratchet (first member) 21 are brought into a completely meshed state.

According to the reclining device having the above-described configuration, the following effects can be obtained.
(1) The main pole 42, the sub pole 41, and the cam 31 are formed so that the sub pole 41 starts to mesh with the inner teeth 23 of the ratchet 21 before the main pole 42 completely meshes with the inner teeth 23 of the ratchet 21. As a result, only the outer teeth 42a of the main pole 42 completely mesh with the inner teeth 23 of the ratchet 21, and the outer teeth 41a of the sub-pole 41 do not mesh with the inner teeth 23 of the ratchet 21 at all. Is obtained.

(2) In the main pole 42, the sub pole 41, and the cam 31, first, the outer teeth 41 a of the sub pole 41 start to mesh with the inner teeth 23 of the ratchet (first member) 21, and then the outer teeth 42 a of the main pole 42. Since the ratchet 21 is formed so as to start meshing with the inner teeth 23 of the ratchet 21, more stable lock strength can be obtained.

(3) In the lock position, the cam 31 (first protrusion 31d, second protrusion 31e, third protrusion 31g) realizes a configuration in which the sub-pole 41 is loosely meshed and the main pole 42 is completely meshed. Therefore, the moldability becomes easy.
(4) Since the main poles 42 are diagonally arranged in the vertical direction, the mesh with no play is in the vertical direction, and the backlash due to the vibration in the front-back direction does not occur.

<External teeth of main pole and external teeth of sub pole>
Next, the shapes of the outer teeth 42a of the main pole 42 and the outer teeth 41a of the sub pole 41 of this embodiment will be described with reference to FIGS. 11 to 13. 11 is a diagram illustrating the outer teeth 42a of the main pole 42 of FIG. 1, FIG. 12 is a diagram illustrating the first outer teeth 101 of FIG. 11, and FIG. 13 is a diagram illustrating the second outer teeth 102 of FIG. is there. 14 is a diagram for explaining the outer teeth 41a of the sub-pole 41 of FIG. 1, FIG. 15 is a diagram for explaining the third outer teeth 103 of FIG. 14, and FIG. 16 is a diagram for explaining the fourth outer teeth 104 of FIG. .

  As shown in FIGS. 11 and 12, the outer teeth 42a of the main pole 42 are collectively referred to as a main pole outer tooth portion 110. The main pole outer tooth portion 110 includes a first outer tooth 101 and a second outer tooth 102.

  Via the radial line (C / L line) passing through the central portion of the plurality of outer teeth 42a of the main pole 42, in the front side (one side) region, from the radial line (C / L line) side, the tooth surface A plurality of standard external teeth 100 that are not cut and a plurality of first external teeth 101 whose tooth surfaces are cut are formed. The cut tooth surface of the first external tooth 101 is a tooth surface to which a large front load acts when a front load in the direction of tilting the seat back forward acts.

As shown in FIGS. 11 and 13, the radius line is formed in the rear side (the other side) through the radius line (C / L line) passing through the central portions of the plurality of outer teeth 42a of the main pole 42. From the (C / L line) side, a plurality of standard external teeth 100 whose tooth surfaces are not cut and a plurality of second external teeth 102 whose tooth surfaces are cut are formed. The cut tooth surface of the second external tooth 102 is a tooth surface on which a large rear load is applied when a rear load, which is a load in the direction of tilting the seat back backward, is applied.
In this embodiment, eight first outer teeth 101 and six second outer teeth 102 are formed.

  The front load is generated by the seat back being biased in the forward tilt direction. The rear load is generated when the back of the seated person pushes the seat back, and the largest rear load is generated when the vehicle is rear-end hit. Therefore, the reclining device is required to have a reclining strength sufficient to withstand a rearward load generated when the vehicle is rear-end hit.

  Further, the angle formed between the cut tooth surface of the first outer tooth 101 and the radial line (C / L line) passing through the central portion of the plurality of outer teeth 42a of the main pole 42 is θ1, and the second outer tooth 102 is The angle formed by the cut tooth surface and the radial line (C / L line) passing through the central portions of the plurality of outer teeth 42a of the main pole 42 was set to θ2 (θ1> θ2).

  As shown in FIG. 14, the outer teeth 41a of the sub-pole 41 are collectively referred to as a sub-pole outer tooth portion 120. The sub-pole external tooth portion 120 includes a third external tooth 103 and a fourth external tooth 104.

  As shown in FIG. 14 and FIG. 15, the radial line (C / L line) passes through the radial line (C / L line) passing through the central portions of the plurality of outer teeth 41a of the sub-pole 41, and the radial line (C From the (/ L line) side, a plurality of standard external teeth 100 whose tooth surfaces are not cut and a plurality of third external teeth 103 whose tooth surfaces are cut are formed. The cut tooth surface of the third external tooth 103 is a tooth surface on which the front load acts when the front load in the direction of tilting the seat back forward acts.

As shown in FIGS. 14 and 16, via the radial line (C / L line) passing through the central portion of the plurality of outer teeth 41a of the sub-pole 41, the radial line ( From the (C / L line) side, a plurality of standard external teeth 100 whose tooth surfaces are not cut and a plurality of fourth external teeth 104 whose tooth surfaces are cut are formed. The cut tooth surface of the fourth external tooth 104 is a tooth surface on which a rear load acts when a rear load, which is a load in the direction of tilting the seat back backward, acts.
In this embodiment, the third outer teeth 103 are formed with 6 peaks and the fourth outer teeth 104 are formed with 4 peaks.

  Further, the angle formed between the cut tooth surface of the third outer tooth 103 and the radial line (C / L line) passing through the central portion of the plurality of outer teeth 41a of the sub pole 41 is θ3, and the fourth outer tooth 104 is cut. The angle formed between the tooth surface and the radial line (C / L line) passing through the central portion of the plurality of outer teeth 41a of the sub pole 41 is θ4 (θ3> θ4, θ1> θ3, θ2> θ4).

Comparing the first external teeth 101 and the third external teeth 103 on which the front load acts, the number of the first external teeth 101 is larger than the number of the third external teeth 103. Further, the angle θ1 formed by the first outer tooth 101 and the radius line (C / L line) is larger than the angle θ3 formed by the third outer tooth 103 and the radius line (C / L line).
Comparing the second external teeth 102 and the fourth external teeth 104 on which the rearward load acts, the number of the second external teeth 102 is larger than the number of the fourth external teeth 104. The angle θ2 formed by the second outer tooth 102 and the radial line (C / L line) is larger than the angle θ4 formed by the fourth outer tooth 104 and the radial line (C / L line).
Here, if the degree of cutting is defined by the angle formed by the cut tooth surface and the radial line passing through the center of the plurality of external teeth, or the number of cut tooth surfaces, the first external tooth 101 and the second external tooth 101 It can be said that the degree of cutting of the main pole outer tooth portion 110 including the outer tooth 102 is larger than the degree of cutting of the sub pole outer tooth portion 120 including the third outer tooth 103 and the fourth outer tooth 104.
In addition, the total number (8 + 6 = 14) of the first outer teeth 101 and the second outer teeth 102 having a shape different from the standard outer teeth 100 in the outer tooth portion of the main pole 42 is the standard in the outer tooth portion of the sub pole 41. The number is larger than the total number (4 + 2 = 6) of the third external teeth 103 and the fourth external teeth 104 having different shapes from the external teeth 100. Therefore, the degree of cutting of the main pole outer tooth portion 110 is larger than the degree of cutting of the sub pole outer tooth portion 120.

With such a configuration, the following effects can be obtained.
The first external tooth 101 to the fourth external tooth 104 are collectively referred to as a cut external tooth. Although the cut external teeth have a lower meshing strength than the standard external teeth 100, the cut external teeth have a high disengageability from the internal teeth 23 of the main pole 42 or the sub pole 41, and the unlocking sound is small. As the degree of cutting increases, the engagement strength decreases, the disengagement increases, and the unlocking sound decreases. In the present embodiment, since the main pole outer tooth portion 110 has a larger degree of cutting than the sub pole outer tooth portion 120, the main pole 42 has a lower meshing strength than the sub pole 41, but the unlocking sound is small.
When maintaining the locked state in the reclining device of the present embodiment, the main pole outer tooth portion 110 meshes with the inner tooth 23 of the ratchet 21, and the sub pole outer tooth portion 120 meshes with the inner tooth 23 of the ratchet 21. The locked state is maintained by and. That is, since the locked state can be maintained by using the two meshed parts, the lock strength is high.
Further, when the lock is released, when the main pole outer tooth portion 110 of the main pole 42 which is in the completely meshed state in the locked state is disengaged from the inner tooth 23, an unlock sound may be generated. However, when the sub-pole outer tooth portion 120 of the sub-pole 41 in the locked state in the locked state is disengaged from the inner teeth 23, there is a low possibility that an unlock sound is generated. Therefore, the degree of cutting of the main pole outer tooth portion 110 of the main pole 42 that may generate a lock release sound when releasing the lock is set to the degree of cutting of the sub pole outer tooth portion 120 of the sub pole 41 that is less likely to generate the lock release sound. Greater than degree. As a result, it is possible to reduce the unlocking sound while achieving a high lock strength.

  The present invention is not limited to the above embodiment. Although the ratchet 21 is provided on the seat back side and the base plate 25 is provided on the seat cushion side in the above-described embodiment, conversely, the base plate 25 may be provided on the seat back side and the ratchet 21 may be provided on the seat cushion side.

  In the above embodiment, the seat back is biased in the forward tilt direction, but the seat is not biased forward.

  Further, in the above configuration, in order to change the degree of cutting between the main pole outer tooth portion 110 and the sub pole outer tooth portion 120, the angle between the tooth surface to be cut and the radial line (C / L line), and the tooth surface Both the number and the number of external teeth cut were changed. However, the number of external teeth having the tooth surface cut is the same, and only the angle between the tooth surface to be cut and the radial line (C / L line) may be changed. Further, the angle between the tooth surface to be cut and the radial line (C / L line) is the same, and the number of external teeth to be cut may be changed.

Further, the main pole external tooth portion 110 may be configured by only the standard external tooth 100 and the first external tooth 101, or may be configured by only the standard external tooth 100 and the second external tooth 102. The sub-pole external tooth portion 120 may be configured by only the standard external tooth 100 and the third external tooth 103, may be configured by only the standard external tooth 100 and the fourth external tooth 104, or may be the standard external tooth 100 only. May be composed of
Note that the degree of cutting of the main pole outer tooth portion 110 is higher than the degree of cutting of the sub pole outer tooth portion 120 includes the following modes.
(1) The total number of the first external teeth 101 and the second external teeth 102 is larger than the total number of the third external teeth 103 and the fourth external teeth 104.
(2) The angle θ12, which is the sum of the angle θ1 formed by the first external tooth 101 and the radial line (C / L line) and the angle θ2 formed by the second external tooth 102 and the radial line (C / L line), is The angle θ3 formed by the third outer teeth 103 and the radius line (C / L line) and the angle θ4 formed by the fourth outer teeth 104 and the radius line (C / L line) are larger than the angle θ34.
In the above description, the first external teeth 101 are all teeth of the same shape, the second external teeth 102 are all teeth of the same shape, and the third external teeth 103 are all teeth of the same shape. Yes, it is premised that all the fourth external teeth 104 have the same shape. However, the present invention is not limited to this. When each cut external tooth is formed by a plurality of teeth having different angles with respect to the radial line, the angle between the first external tooth 101 and the radial line (C / L line) Let the average be θ1. The average of the angles formed by the respective second outer teeth 102 and the radius line (C / L line) is set to θ2. The average of the angles formed by the respective third outer teeth 103 and the radial line (C / L line) is θ3. The average of the angles formed by the respective fourth outer teeth 104 and the radius line (C / L line) is θ4. The relations described above may be established for θ1 to θ4 calculated in this way.

  Further, it is preferable that the cutting degree of the first external teeth 101 is larger than the cutting degree of the third external teeth 103. Similarly to the above, in the locked state, the first outer teeth 101 are in full mesh with the inner teeth 23, but the third outer teeth 103 are in loose mesh with the inner teeth. For this reason, if the degree of cutting of the first external teeth 101 is larger than the degree of cutting of the third external teeth 103, the unlocking sound is easily reduced.

  Further, it is preferable that the degree of cutting of the second outer teeth 102 is larger than the degree of cutting of the fourth outer teeth 104. Similarly to the above, in the locked state, the second outer teeth 102 are in full engagement with the inner teeth 23, but the fourth outer teeth 104 are in loose engagement with the inner teeth. For this reason, if the degree of cutting of the second external teeth 102 is larger than the degree of cutting of the fourth external teeth 104, the unlocking sound is easily reduced.

  Further, it is preferable that the cutting degree of the first external tooth 101 is different from the cutting degree of the second external tooth 102. More preferably, the degree of cutting of the first external tooth 101 is larger than the degree of cutting of the second external tooth 102. A rear load, which is a load in the direction of tilting the seat back backward, often acts on the reclining device. Therefore, the smaller the degree of cutting the second external teeth 102 is, the more the locked state is against the rear load that frequently acts. This is because it is easy to maintain.

  Further, it is preferable that the degree of cutting of the third outer teeth 103 is different from the degree of cutting of the fourth outer teeth 104. More preferably, the degree of cutting of the third outer teeth 103 is larger than the degree of cutting of the fourth outer teeth 104. A rear load, which is a load in the direction of tilting the seat back backward, often acts on the reclining device. Therefore, the smaller the degree of cutting of the second external teeth 102 is, the more the locked state is against the rear load that frequently acts. This is because it is easy to maintain.

The present invention is not limited to the above embodiment.
For example, although the above embodiment has been described with four poles, three poles are also possible. In this case, it is preferable that two of the three poles are main poles and the main pole and the second cam are diagonally provided.

  It is also possible when there are five or more poles. In this case, it is preferable that there are at least two second cams, and one set of second cams of the second cams is diagonally arranged.

21 Ratchet (first member)
25 Base plate (second member)
31 Cam 37 Pole Guide Projection 41 Sub Pole 42 Main Pole 51 Wire Craft Spring

Claims (3)

Inner teeth are formed on the inner cylindrical surface along the circumferential direction, and one surface is a bottomed cylindrical first member having an open surface,
A main pole having external teeth capable of meshing with the internal teeth,
A subpole having external teeth capable of meshing with the internal teeth,
The lock member is laminated on the open surface side of the first member and is rotatable relative to the first member in the circumferential direction, and the lock position where the outer teeth mesh with the inner teeth and the outer teeth are the inner teeth. A second member formed with a pole guide for guiding the main pole and the sub pole between the unlock positions separated from
A cam that is rotatably provided between the first member and the second member and that pushes the main pole and the sub pole in the lock position direction,
Have
When the main pole and the sub pole are in the locked position, the outer teeth of the main pole and the inner teeth of the first member are in a complete meshing state, and the outer teeth of the sub pole and the first member A reclining device in which the internal teeth are in a chewed state and relative rotation of the first member and the second member is prohibited,
The first member is provided on either one of the seat cushion and the seat back, and the second member is provided on the other one,
The main pole has a main pole external tooth portion having a first external tooth on the side in which the seat back is tilted forward, and a second external tooth on the side in which the seat back is tilted backward,
The sub-pole has a sub-pole external tooth portion having a third external tooth on the side of the seat back that is tilted forward, and a fourth external tooth on the side of the seat back that is tilted rearward,
When the degree of cutting is defined by the angle between the cut tooth surface and the radial line passing through the center of multiple external teeth, or the number of cut tooth surfaces,
A reclining device in which the degree of cutting of the outer tooth portion of the main pole is larger than the degree of cutting of the outer tooth portion of the sub pole.   The reclining device according to claim 1, wherein the cutting degree of the first external tooth is larger than the cutting degree of the third external tooth.   The reclining device according to claim 1, wherein the cutting degree of the second external teeth is larger than the cutting degree of the fourth external teeth.

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