JP6154234B2 - Reclining mechanism - Google Patents

Description

  The present invention relates to a reclining mechanism for adjusting an inclination angle of a seat back with respect to a seat cushion.

  Conventionally, as a reclining mechanism, a base plate fixed to a seat cushion, an internal gear fixed to a seat back and rotatable with respect to the base plate, a lock position engaging with the internal gear, and a release position deviating from the internal gear And a lock gear that is linearly movable and a slide cam that is supported by the base plate so as to be linearly movable and presses the lock gear toward the lock position is known (see Patent Document 1).

  Specifically, in this technique, the base plate is provided with a slide surface that slidably supports the slide cam and four guide portions that project from the slide surface and guide the slide cam. The respective guide portions are provided at positions separated from each other so as to guide the left and right side surfaces of the front end portion and the rear end portion in the moving direction of the slide cam.

Japanese Patent No. 4622113

  However, in the prior art, since the four guide portions that support the slide cam are provided separately from each other, the rigidity of each guide portion may be weakened. In order to guide the slide cam stably, the guide portion needs to have rigidity. However, if the guide portion is thickened to ensure rigidity, the guide portion becomes large.

  Accordingly, an object of the present invention is to ensure rigidity while suppressing an increase in size of the guide portion.

  Another object of the present invention is to simplify and reduce the size of the reclining mechanism, and to favorably operate the reclining mechanism.

The present invention for solving the above-described problems is a reclining mechanism for adjusting an inclination angle of a seat back with respect to a seat cushion, the base plate being fixed to one of the seat cushion and the seat back, the seat cushion, and the It is fixed to the other side of the seat back, and is displaceable between an internal gear that can rotate with respect to the base plate, a locking posture that meshes with the internal gear, and a releasing posture that is disengaged from the internal gear. A lock gear supported by the base plate so as to be displaceable, and a slide that is supported by the base plate so as to be movable along a predetermined line and that presses the lock gear to bring the lock gear into the lock posture or the release posture. Operate the cam and the slide cam And an operation member for.
The base plate is disposed so as to be opposed to the slide cam in the axial direction of the internal gear, and to sandwich the slide cam in a direction that protrudes from the slide surface and is orthogonal to the moving direction of the slide cam. A plurality of guide portions for guiding the slide cam; and a coupling portion protruding from the slide surface and connecting one end portions of the plurality of guide portions in the moving direction.

  Here, the “predetermined line” means a straight line or a curve.

  According to this configuration, since the plurality of guide portions protruding from the slide surface are reinforced by the coupling portion protruding from the same slide surface, it is possible to ensure rigidity without increasing the size of each guide portion in the thickness direction. it can.

  In the above-described configuration, the slide cam has a first position for pressing the lock gear toward the lock posture by pressing a lock-side pressed portion provided on the lock gear, and a release side provided on the lock gear. You may be comprised so that it can move to the 2nd position which presses the said lock gear toward the said releasing attitude | position by pressing a to-be-pressed part.

  According to this, since the lock gear can be locked / released only by moving the slide cam, for example, a spring for releasing the lock gear is unnecessary, the number of parts is reduced, and the reclining mechanism is Simplification can be achieved.

  In the above-described configuration, the internal gear has a facing portion that faces the base plate in the axial direction, and one of the plurality of guide portions, the coupling portion, and the facing portion is on the other side. And a recess for enabling the protrusion to move in the rotational direction of the internal gear, and at both ends of the recess in the rotational direction. You may be comprised so that the movement of the said protrusion part may be controlled.

  According to this, the reclining mechanism can be reduced in size in the axial direction as compared with, for example, a structure in which a portion that restricts the movement of the protrusion is formed in a protruding shape.

  In the above-described configuration, the protruding portion may be provided in the facing portion, and the concave portion may be provided in the plurality of guide portions and the coupling portion.

  According to this, as described above, the reclining mechanism can be reduced in size in the axial direction.

  In the above-described configuration, a biasing member that biases the slide cam toward the first position may be provided.

  According to this, the urging force of the urging member can be transmitted to the lock gear via the slide cam and the lock gear can be firmly meshed with the internal gear, so that the reclining mechanism can be operated satisfactorily.

  In the above-described configuration, the urging member may be disposed between the slide cam and the coupling portion and supported by the coupling portion.

  According to this, the reclining mechanism can be simplified because the urging member is supported using the coupling portion as compared with, for example, a structure in which a portion that supports the urging member is newly formed. Further, the biasing member that biases the slide cam can be favorably supported by the highly rigid coupling portion.

  In the above-described configuration, the base plate may be fixed to the seat cushion, and the moving direction of the slide cam may be set in the vertical direction.

  According to this, when a force is applied to the seat cushion in the front-rear direction, it is possible to suppress the slide cam from moving due to the force, so that the lock gear can be maintained in the locked posture, and thus reclining. The mechanism can be operated well.

  In the above configuration, the lock gear may be rotatably supported by the base plate.

  According to this, since the gear teeth of the lock gear can be meshed with the internal gear in order from the rotation shaft side, for example, compared with the lock gear that moves linearly, the mesh of the lock gear can be meshed well with the internal gear. As a result, the reclining mechanism can be operated satisfactorily.

  Further, in the above-described configuration, the lock gear is formed in an elongated shape extending along the circumferential direction of the internal gear, and the lock-side pressed portion and the release-side pressed portion are provided at one end side in the longitudinal direction. You may have.

  For example, in a structure in which the lock gear is rotated in the lock direction / release direction by bringing one end and the other end in the moving direction of the slide cam into contact with one end and the other end in the longitudinal direction of the lock gear, the height of the coupling portion is increased. It is necessary to make the slide cam partly protrude toward the lock gear rather than the coupling portion. On the other hand, according to this structure, the portion acting on each pressed portion provided on one end side of the lock gear need only be provided on one end side of the slide cam, so there is no need to reduce the height of the coupling portion. The rigidity of the coupling portion can be increased, and consequently the rigidity of each guide portion can be increased.

  In the above-described configuration, the lock-side pressed portion is disposed radially inward of the internal gear with respect to the release-side pressed portion, and the slide cam is a lock that presses the lock-side pressed portion. A side pressing portion, a release side pressing portion that is provided on the radially outer side than the lock side pressing portion and presses the release side pressed portion, and connects the lock side pressing portion and the release side pressing portion. The release side pressing portion may be formed in an arc shape along the inner peripheral surface of the internal gear.

  According to this, since the interference between the release side pressing portion and the internal gear can be suppressed as compared with, for example, a case where the release side pressing portion is formed in a rectangular shape, the reclining mechanism can be operated favorably.

  Further, in the above-described configuration, the release-side pressing portion protrudes inward in the radial direction from a main body portion formed in an arc shape along an inner peripheral surface of the internal gear, and an end portion of the main body portion. You may have the contact part contact | abutted to the cancellation | release side pressed part.

  According to this, since the contact part which is a part contact | abutted with the cancellation | release side pressed part of the cancellation | release side press part protrudes from the edge part of a main-body part, the rigidity of the cancellation | release side press part whole can be improved. Therefore, the release-side pressed part can be suitably pressed by the release-side pressing part, so that the reclining mechanism can be operated satisfactorily.

  In the above configuration, the contact surface of the contact portion with the release-side pressed portion may be a curved surface.

  According to this, since the sliding resistance between the contact portion and the release side pressed portion can be reduced, the lock gear can be released smoothly, and the reclining mechanism can be operated satisfactorily. .

  In the above-described configuration, a gap may be formed between the connecting portion and one end portion of the lock gear when the lock gear is in the release posture.

  According to this, when the lock gear is released, the one end portion of the lock gear does not contact the connecting portion, so that the lock gear can be released smoothly and the reclining mechanism can be operated satisfactorily.

  According to the structure of Claim 1, 9, rigidity can be ensured, suppressing the enlargement of a guide part.

  According to the structure of Claim 2, simplification of a reclining mechanism can be achieved.

  According to the structure of Claim 3, 4, a reclining mechanism can be reduced in size.

  According to the structure of Claim 5, 7, 8, 10-13, a reclining mechanism can be operated favorably.

  According to the configuration of the sixth aspect, the reclining mechanism can be simplified, and the urging member that urges the slide cam can be favorably supported by the highly rigid coupling portion.

It is a side view which shows the vehicle seat provided with the reclining mechanism which concerns on one Embodiment of this invention. It is sectional drawing (a) which shows the locked state of a reclining mechanism, and II sectional drawing (b) of Fig.2 (a). It is sectional drawing which shows the cancellation | release state of a reclining mechanism. It is sectional drawing which shows the locked state of the reclining mechanism which concerns on the modification 1. FIG. It is sectional drawing which shows the cancellation | release state of the reclining mechanism which concerns on the modification 1. It is sectional drawing which shows the locked state of the reclining mechanism which concerns on the modification 2. It is sectional drawing which shows the cancellation | release state of the reclining mechanism which concerns on the modification 2. It is sectional drawing which shows the reclining mechanism which concerns on the modification 3. FIG.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the present invention, front and rear, left and right, and top and bottom are based on a passenger sitting on the vehicle seat S.

  As shown in FIG. 1, the reclining mechanism 2 is a mechanism for adjusting the inclination angle of the seat back S2 with respect to the seat cushion S1 of the vehicle seat S, and is provided on one of the rear portions of the seat cushion S1 in the left-right direction. Yes. In the following description, it is assumed that the reclining mechanism 2 is provided on the right side of the seat cushion S1.

  The seat cushion S1 has a pair of cushion side frames F1 that are spaced apart from each other on the left and right, and the seat back S2 has a pair of back side frames F2 that are spaced apart from each other on the left and right. The lower end portion of each back side frame F2 overlaps with the rear end portion of the corresponding cushion side frame F1 when viewed from the left-right direction, and is disposed on the inner side in the left-right direction than the rear end portion. The reclining mechanism 2 is provided between the rear end portion of the right cushion side frame F1 and the lower end portion of the right back side frame F2.

  As shown in FIG. 2A, the reclining mechanism 2 includes a base plate 100, two lock gears 200, a slide cam 300, a rotation shaft 400 as an example of an operation member, and an internal gear 500. And a compression coil spring SP2 as an example of an urging member. The base plate 100 is fixed to a cushion side frame F1 constituting the seat cushion S1. The internal gear 500 is rotatably supported by the base plate 100 via a ring, is fixed to the back side frame F2 constituting the seat back S2, and rotates integrally with the seat back S2. .

  The rotation of the internal gear 500 with respect to the base plate 100 is regulated (locked) or allowed (released) by the lock gear 200 operated by the slide cam 300 or the like disposed between the base plate 100 and the internal gear 500. It has become. As a result, the tilting of the seat back S2 relative to the seat cushion S1 can be restricted or allowed depending on the operating state of the lock gear 200 or the like. Below, each member is demonstrated in detail.

  The base plate 100 includes a disk-shaped base portion 110 and a pair (a plurality) of guide portions 120 and a coupling portion 130 that bulge from the base portion 110 to the left (internal gear 500 side).

  A portion sandwiched between the pair of guide portions 120 in the left side surface of the base portion 110 faces the slide cam 300 in the axial direction of the internal gear 500, and a slide surface 111 for slidably supporting the slide cam 300. It has become. The slide surface 111 is formed so as to extend upward and downward from the central portion of the base 110.

  The pair of guide portions 120 are portions that guide the slide cam 300 so as to be movable in the vertical direction, and are arranged so as to sandwich the slide surface 111 in the front-rear direction orthogonal to the movement direction of the slide cam 300. And the lower end part of each guide part 120 is couple | bonded by the coupling | bond part 130. FIG.

  Thereby, since each guide part 120 protruding from the slide surface 111 is reinforced by the coupling part 130 protruding from the same slide surface 111, rigidity is ensured without increasing the size of each guide part 120 in the thickness direction. Can do.

  Further, the pair of guide portions 120 and the coupling portion 130 are provided with arc-shaped recesses 140 for allowing the protrusions 540 formed on the internal gear 500 to move in the rotational direction of the internal gear 500. Yes. The protrusion 540 of the internal gear 500 enters the recess 140, and movement is restricted by both end portions 141 and 142 in the rotation direction of the recess 140.

  Thereby, it is possible to regulate the tilting amount of the seat back S2 that rotates integrally with the internal gear 500. In addition, by adopting a configuration in which the protruding portion 540 is inserted into the recess 140 in this way, for example, a portion that restricts the movement of the protruding portion is protruded from the pair of guide portions to the internal gear side. The reclining mechanism 2 can be downsized in the axial direction.

  The lock gear 200 is formed in a long shape extending along the circumferential direction of the internal gear 500, and is provided one by one with the slide cam 300 interposed therebetween in the front-rear direction orthogonal to the moving direction of the slide cam 300, and its lower end portion Is rotatably supported on a support shaft 150 fixed to the base plate 100. That is, the lock gear 200 is rotatably supported by the base plate 100 via the support shaft 150.

  The lock gear 200 is rotatable between a locked posture (the posture shown in FIG. 2A) that meshes with the internal gear 500 and a released posture (the posture shown in FIG. 3) that is disengaged from the internal gear 500. Specifically, the lock gear 200 includes a substantially arc-shaped first extending portion 210 that extends upward from the support shaft 150 along the circumferential direction of the internal gear 500, and an inner side in the front-rear direction from the upper end portion of the first extending portion 210 ( And a second extending portion 220 extending in a direction away from the internal gear 500.

  A part of the outer peripheral surface of the first extending portion 210 is provided with a plurality of gear teeth 211 that mesh with a plurality of inner teeth 510 formed on the internal gear 500. The second extending portion 220 is formed so as to extend inward in the front-rear direction from the upper end portion of the first extending portion 210, and then obliquely extend upward and inward in the front-rear direction, and the tip end portion thereof is tapered. ing.

  The second extending portion 220 has an engagement surface 221, a lock-side pressed surface 222 as an example of a lock-side pressed portion, an engagement surface 221, and a lock-side pressed surface on the lower side (inward in the radial direction). A connection surface 223 that connects the surface 222 is provided, and a release-side pressed surface 224 as an example of a release-side pressed portion is provided on the upper side (radially outer side).

  The engagement surface 221 is a surface that first comes into contact with the slide cam 300 when the lock gear 200 that is in the release posture (the posture of FIG. 3) is pressed upward by the slide cam 300, and is inclined inward in the front-rear direction as it goes upward. It is formed to do. When the lock gear 200 is in the release posture, the engagement surface 221 is disposed so as to be opposed to and close to a contact surface 312 of a slide cam 300 described later.

  The lock-side pressed surface 222 is a surface that receives a pressing force from the slide cam 300 when the lock gear 200 is in the locked posture, and is disposed at a position on the inner side in the front-rear direction and on the upper side than the engagement surface 221. Yes. The lock-side pressed surface 222 is formed so as to incline in the front-rear direction as it goes upward, so that the lock-side pressed surface 313 of the slide cam 300 (described later) is vertically aligned regardless of the posture of the lock gear 200. It is arranged at the opposite position.

  When the lock gear 200 is in the locked posture, the connecting surface 223 extends upward from the edge on the inner side in the front-rear direction of the engagement surface 221 along the vertical direction, and then curves inward in the front-rear direction to be locked-side pressed surface. 222 to be coupled to 222. Further, the connecting surface 223 is in a non-contact state (with a gap) with the slide cam 300 when the lock gear 200 is in the locked posture. By making the connecting surface 223 and the slide cam 300 in non-contact in this way, the slide cam 300 is moved in the locking direction even when there are product errors and assembly errors in the components such as the lock gear 200 and the slide cam 300. At this time, since the slide cam 300 and the connecting surface 223 do not interfere with each other, only the end portion of each lock-side pressing surface 313 of the slide cam 300 can be brought into contact with each lock gear 20 at the time of locking, and the lock gear 200 is connected to the internal gear 500. It is possible to make it easy to mesh with the.

  The release-side pressed surface 224 is a surface that comes into contact with the slide cam 300 when the lock gear 200 in the locked posture is pressed downward by the slide cam 300, and is formed to incline in the front-rear direction as it goes upward. Yes. The release-side pressed surface 224 is disposed at a position facing a contact portion 332 of the slide cam 300 described later in the vertical direction regardless of the posture of the lock gear 200.

  The slide cam 300 is supported between the pair of guide portions 120 so as to be linearly movable in the vertical direction. The slide cam 300 presses the lock-side pressed surface 222 of the lock gear 200 upward to press the lock gear 200 toward the lock posture (the position in FIG. 2A, hereinafter also referred to as the lock position). ) And a second position (a position in FIG. 3, hereinafter also referred to as a release position) that presses the lock gear 200 toward the release posture by pressing the release side pressed surface 224 of the lock gear 200 downward. It is configured.

  According to this, since the lock gear 200 can be locked and released only by pressing the lock gear 200 with the slide cam 300, for example, a spring or the like for releasing the lock gear becomes unnecessary, and the number of parts increases. Can be suppressed. Further, since the slide cam 300 is configured to press one end portion of the lock gear 200 in the longitudinal direction, the lock gear 200 can be easily rotated as compared with a structure in which the center portion in the longitudinal direction of the lock gear is pressed by the slide cam, for example. The lock gear 200 can be reliably locked or released.

  Further, since the moving direction of the slide cam 300 is set to the vertical direction, when a force is applied in the front-rear direction to the seat back S2 at the time of a collision, the force is transferred via the internal gear 500 and the lock gear 200. 300 is added in a direction orthogonal to the moving direction. Therefore, the slide cam 300 can be prevented from moving in the release direction, so that the lock gear 200 can be maintained in the locked posture.

  Specifically, the slide cam 300 includes a substantially rectangular slide portion 310 that is long in the vertical direction, a connecting portion 320 that extends upward from the upper end of the slide portion 310, and a release side that extends outward in the front-rear direction from the upper end of the connecting portion 320. And a pressing portion 330.

  The slide portion 310 includes a pair of guided surfaces 311 guided by the guide portions 120, a pair of contact surfaces 312 formed so as to be inclined upward and inward in the front-rear direction from the upper end of each guided surface 311; It has a pair of lock side press surfaces 313 as an example of a lock side press part.

  The contact surface 312 is a surface that comes into contact with the engagement surface 221 of the lock gear 200 in the initial stage of pressing the lock gear 200 in the release posture upward by the slide cam 300, and when the lock gear 200 is in the release posture, In addition to being parallel to the engagement surface 221 of 200, it is disposed close to the engagement surface 221.

  The lock-side pressing surface 313 is a surface that presses the lock-side pressed surface 222 of the lock gear 200 when the lock gear 200 is in the locked posture, and is located on the inner side in the front-rear direction and on the upper side of the contact surface 312. Has been placed. Specifically, a connecting surface (reference numeral is omitted) is formed on the outer edge in the front-rear direction of the lock-side pressing surface 313, extending substantially downward and then bending outward in the front-rear direction to connect to the contact surface 312. A corner between the coupling surface and the lock-side pressing surface 313 is formed in an R shape. And the corner | angular part (end part of the front-back direction outer side of the lock side press surface 313) used as this R shape contact | abuts to the lock side pressed surface 222. FIG.

  In addition, a long hole 314 is formed in the lower portion of the slide portion 310 along the vertical direction for allowing the rotation shaft 400 to penetrate in the left-right direction and allowing the slide cam 300 to move. In addition, an engagement groove hole 315 that can be engaged with an engagement piece 410 of the rotation shaft 400 described later is formed in the slide portion 310 continuously with the elongated hole 314.

  The connecting portion 320 is a portion that connects the slide portion 310 and the release-side pressing portion 330, is disposed adjacent to the inner side in the front-rear direction of the pair of lock-side pressing surfaces 313, and faces upward from each locking-side pressing surface 313. Are formed so as to extend along the vertical direction. The connecting portion 320 is formed with such a width that a gap is formed between the connecting portion 320 and the distal end portion (second extending portion 220) of the lock gear 200 when the lock gear 200 is in the release posture. Thereby, when the lock gear 200 is released, the distal end portion of the lock gear 200 does not come into contact with the connecting portion 320, so that the release operation of the lock gear 200 can be performed smoothly.

  The release-side pressing portion 330 has a main body portion 331 formed in an arc shape along the inner peripheral surface of the internal gear 500, and a pair of contact portions 332 formed at both ends of the main body portion 331. ing. Each contact portion 332 is formed in a columnar shape, protrudes downward (inward in the radial direction) from the main body portion 331, and is configured such that an outer peripheral surface thereof contacts the release-side pressed surface 224.

  Since the abutment portion 332 that abuts against the release-side pressed surface 224 protrudes from the main body portion 331, the rigidity of the release-side press portion 330 as a whole can be increased. The pressing surface 224 can be suitably pressed. Further, each contact portion 332 and each release side pressed surface are formed by forming each contact portion 332 in a columnar shape, that is, by making the contact surface of each contact portion 332 with each release side pressed surface 224 a curved surface. Since the sliding contact resistance with 224 can be reduced, the releasing operation of the lock gear 200 can be performed smoothly. Furthermore, by forming the main body portion 331 in an arc shape along the inner peripheral surface of the internal gear 500, for example, compared with a case where the main body portion is formed in a rectangular shape, interference between the main body portion 331 and the internal gear 500 is suppressed. It is possible.

  The rotation shaft 400 is a member for moving the slide cam 300 downward, and is configured to rotate in conjunction with an operation lever (not shown) operated by an occupant. The rotating shaft 400 has an engagement piece 410 that protrudes radially outward from the outer peripheral surface and engages with the engagement groove hole 315 of the slide cam 300 on a part of the outer peripheral surface. Accordingly, when the rotation shaft 400 is rotated clockwise in the figure when the lock gear 200 is in the locked posture, the engagement groove hole 315 is pressed downward by the engagement piece 410 and the slide cam 300 is moved downward. It is supposed to move.

  The internal gear 500 protrudes toward the base plate 100 from the disc portion 520 (see FIG. 2B) as an example of the facing portion that faces the base plate 100 in the axial direction, and the outer peripheral portion of the disc portion 520. It has a ring-shaped internal tooth forming portion 530 having internal teeth 510 on the peripheral side.

  The disc portion 520 is a portion that forms a housing that accommodates each lock gear 200 and the slide cam 300 between the disc portion 520 and a portion corresponding to the recess 140 formed in the guide portion 120 of the base plate 100. A protrusion 540 that protrudes toward the base plate 100 is provided.

  The compression coil spring SP <b> 2 is a spring that urges the slide cam 300 toward the lock position, is disposed between the slide cam 300 and the coupling portion 130 of the base plate 100, and is supported by the coupling portion 130. As a result, the urging force of the compression coil spring SP2 can be transmitted to each lock gear 200 via the slide cam 300, so that each lock gear 200 can be firmly engaged with the internal gear 500. Further, for example, compared to a structure in which a portion for supporting the compression coil spring is newly formed separately from the coupling portion, the compression coil spring SP2 is supported by using the coupling portion 130, so that the reclining mechanism 2 can be simplified. It has become. Furthermore, since the compression coil spring SP2 can be favorably supported by the highly rigid coupling portion 130, the slide cam 300 can be favorably operated.

Next, the operation of the reclining mechanism 2 will be described in detail.
As shown in FIG. 2 (a), when the occupant operates the operation lever in the release direction in a state where each lock gear 200 is in the locked posture, the rotation shaft 400 rotates clockwise in the figure, thereby turning the rotation shaft. The engagement groove 410 of the slide cam 300 is pushed downward by the engagement piece 410 of 400, and the slide cam 300 moves downward from the lock position against the urging force of the compression coil spring SP2. At this time, since the slide cam 300 is guided by the pair of guide portions 120 whose rigidity is increased by the coupling portion 130, the slide cam 300 moves favorably toward the lower release position.

  After that, as shown in FIG. 3, each contact portion 332 of the slide cam 300 that moves downward contacts the release-side pressed surface 224 of each lock gear 200, and lowers the release-side pressed surface 224 downward. By pushing down, each lock gear 200 rotates from the locked position to the released position, and when the slide cam 300 reaches the released position, each lock gear 200 is in the released position.

  Further, when the occupant releases the hand from the operation lever in the state where each lock gear 200 is in the release posture, the slide cam 300 moves upward by the biasing force of the compression coil spring SP2. At this time, the slide cam 300 is guided by the pair of guide portions 120 whose rigidity is increased by the coupling portion 130, and therefore, the slide cam 300 moves favorably toward the upper lock position. The slide cam 300 that moves upward first pushes the engagement surface 221 of each lock gear 200 upward at each contact surface 312, thereby rotating each lock gear 200 from the release posture to the lock posture.

  Thereafter, when the lock gears 200 are substantially locked, the contact surfaces 312 of the slide cams 300 are disengaged from the engagement surfaces 221 of the lock gears 200 and enter between the lock gears 200. As a result, each lock-side pressing surface 313 of the slide cam 300 moves so as to approach the lock-side pressed surface 222 of each lock gear 200, and each lock-side pressed surface 222 is pressed, whereby each lock gear 200. Is held in the locked position.

  Although the embodiments of the present invention have been described above, the present invention can be implemented with appropriate modifications as shown in other embodiments below. In the following embodiments, the same reference numerals are given to components that are substantially the same as those in the above-described embodiment, and the description thereof is omitted.

  In the above-described embodiment, the slide cam 300 is configured to press the lock gear 200 in both the lock posture and the release posture. However, the present invention is not limited to this, and for example, as shown in FIGS. The cam 300 may be configured to press the lock gear 200 only in the locked posture, or the slide cam 300 may be configured to press the lock gear 200 only in the released posture as shown in FIGS. .

  Specifically, in the form of FIGS. 4 and 5, the slide cam 300 has a shape in which the connecting portion 320 and the release-side pressing portion 330 described above are removed. Instead, a tension coil spring 600 is provided at the tip of each lock gear 200 to urge each lock gear 200 toward the release posture. Further, the second extending portion 220 of each lock gear 200 is formed to be wider than that of the above-described embodiment in order to attach the tension coil spring 600.

  In the locked state, the urging force of each spring SP2, 600 is set so that the force applied from the slide cam 300 toward each lock gear 200 is larger than the force applied from each lock gear 200 toward the slide cam 300. ing.

  In this mode, when each lock gear 200 is in the locked posture shown in FIG. 4, when the occupant operates the operation lever in the release direction, the rotation shaft 400 rotates clockwise in the drawing, so that the rotation shaft 400 The engagement groove 410 pushes down the engagement groove hole 315 of the slide cam 300, and the slide cam 300 moves downward from the lock position against the urging force of the compression coil spring SP2. By the downward movement of the slide cam 300, the distal end portions of the lock gears 200 supported by the slide cam 300 are rotated in the direction approaching each other by the tension coil spring 600, so that the lock gears 200 are released as shown in FIG. It becomes.

  Further, when the occupant releases the hand from the operation lever in the state where each lock gear 200 is in the release posture, the slide cam 300 moves upward by the biasing force of the compression coil spring SP2. The slide cam 300 that moves upward pushes the tip of each lock gear 200 upward in the same manner as in the above-described embodiment, so that each lock gear 200 is moved from the release posture to the lock posture against the urging force of the tension coil spring 600. Rotate.

  6 and 7, the slide cam 300 is configured such that the contact surfaces 312 and the lock-side pressing surfaces 313 described above are removed. Specifically, the slide cam 300 is configured not to contact the lock gears 200 in the locked state. Yes. Instead, a compression coil spring 601 is provided between each guide portion 120 and each lock gear 200 to urge each lock gear 200 toward the lock posture. In addition, each guide portion 120 is provided with an installation recess 121 for installing the compression coil spring 601. Further, the base plate 100 is provided with a restriction portion (not shown) for restricting the slide cam 300 at the release position.

  In this form, when the occupant operates the operation lever in the release direction in a state where each lock gear 200 is in the locked posture shown in FIG. 6, the rotation shaft 400 rotates clockwise in the drawing, thereby The engagement groove 410 pushes down the engagement groove hole 315 of the slide cam 300, and the slide cam 300 moves downward from the lock position against the urging force of the compression coil spring SP2. After that, as shown in FIG. 7, the release-side pressing portion 330 of the slide cam 300 that moves downward presses the distal end portion of each lock gear 200, so that each lock gear 200 receives the biasing force of each compression coil spring 601. Accordingly, when the slide cam 300 reaches the release position, the lock gear 200 is set to the release position when the slide cam 300 reaches the release position.

  In addition, when the occupant releases the hand from the operation lever in a state where each lock gear 200 is in the release posture, the slide cam 300 is moved from the release position to the lock position by the urging force of the compression coil spring SP2, and the compression coil springs 601 have the Due to the urging force, each lock gear 200 rotates from the release posture toward the lock posture.

  In the above embodiment, the base plate is fixed to the seat cushion and the internal gear is fixed to the seat back, but the present invention is not limited to this, and the base plate is fixed to the seat back and the internal gear is fixed to the seat cushion. May be.

  In the embodiment described above, two lock gears are provided. However, the present invention is not limited to this. For example, the number of lock gears may be one, or may be three or more.

  In the embodiment, the lock gear 200 is configured to be rotatable. However, the present invention is not limited to this, and for example, the lock gear may be configured to be linearly movable. However, compared to the structure in which the lock gear is moved linearly in this way, in the structure in which the lock gear 200 is rotated as in the above embodiment, the gear teeth of the lock gear are meshed with the internal gear in order from the rotation shaft side. As a result, the lock gear can be meshed well with the internal gear.

  In the above-described embodiment, the concave portion 140 has an arc shape. However, the present invention is not limited to this, and any shape may be used as long as it includes a movement locus (arc-like locus) of a protruding portion formed on the internal gear. It may be a simple shape.

  In the above embodiment, both the lock-side pressed portion (lock-side pressed surface 222) and the release-side pressed portion (release-side pressed surface 224) are provided on one end side in the longitudinal direction of the lock gear. For example, the lock-side pressed portion may be provided on one end side in the longitudinal direction of the lock gear, and the release-side pressed portion may be provided on the other end side. In other words, the lock gear may be configured to rotate in the lock direction / release direction by bringing one end and the other end in the moving direction of the slide cam into contact with one end and the other end in the longitudinal direction of the lock gear. However, in this structure, it is necessary to make the height of the coupling portion low so that a part of the slide cam protrudes to the lock gear side from the coupling portion, but in the above embodiment, each pressed member provided on one end side of the lock gear Since it is only necessary to provide a portion acting on the portion only on one end side of the slide cam, it is not necessary to reduce the height of the coupling portion, and the rigidity of the coupling portion can be increased.

  In the embodiment, the compression coil spring SP2 is exemplified as the urging member. However, the present invention is not limited to this, and the urging member may be, for example, a torsion spring or a leaf spring.

  In the above-described embodiment, the reclining mechanism is applied to the vehicle seat S provided on the vehicle. However, the present invention is not limited to this, and the reclining mechanism is applied to a seat provided on something other than the vehicle such as a massage chair. May be.

  In the above embodiment, the vertical position (distance from the rotation axis of the lock gear 200) of each gear tooth 211 of each lock gear 200 is the same, but the present invention is not limited to this, as shown in FIG. For example, the gear teeth 212 of the rear lock gear 200 may be arranged so as to be shifted upward (in the direction away from the rotation axis) from the gear teeth 211 of the front lock gear 200. According to this, when the slide cam 300 is moved from the release position toward the lock position, the lock gears 200 are engaged with the internal gear 500 at different timings. Compared to the structure in which the internal gear 500 is simultaneously meshed, the two lock gears 200 can be easily meshed with the internal gear 500.

  In the above-described embodiment, the slide cam 300 is configured to be movable along a straight line. However, the present invention is not limited to this. For example, the slide cam is configured to be movable along a curved line that is slightly curved. Also good.

  In the said embodiment, although the shape of each guide part 120 was made into the line symmetrical shape, this invention is not limited to this, The shape of each guide part 120 may be formed in the shape which is not line symmetrical.

2 Reclining mechanism 100 Base plate 111 Slide surface 120 Guide part 130 Coupling part 200 Lock gear 300 Slide cam 500 Internal gear

Claims (13)

A reclining mechanism for adjusting the inclination angle of the seat back with respect to the seat cushion,
A base plate fixed to one of the seat cushion and the seat back;
An internal gear fixed to the other of the seat cushion and the seat back and rotatable with respect to the base plate;
A lock gear supported displaceably on the base plate so as to be displaceable between a lock posture meshing with the internal gear and a release posture disengaged from the internal gear;
A slide cam that is supported by the base plate so as to be movable along a predetermined line, and that presses the lock gear to bring the lock gear into the lock posture or the release posture;
An operation member for operating the slide cam,
The base plate is disposed so as to be opposed to the slide cam in the axial direction of the internal gear, and to sandwich the slide cam in a direction that protrudes from the slide surface and is orthogonal to the moving direction of the slide cam. A reclining mechanism comprising: a plurality of guide portions for guiding a slide cam; and a coupling portion protruding from the slide surface and connecting one end portions of the plurality of guide portions in the moving direction.   The slide cam presses a lock-side pressed portion provided on the lock gear to press the lock gear toward the lock position, and presses a release-side pressed portion provided on the lock gear. The reclining mechanism according to claim 1, wherein the reclining mechanism is configured to be movable to a second position where the lock gear is pressed toward the release posture. The internal gear has a facing portion that faces the base plate in the axial direction;
One of the plurality of guide portions, the coupling portion, and the facing portion is provided with a protruding portion that protrudes toward the other side, and on the other side, the protruding portion is configured to rotate the internal gear. Is provided with a recess for enabling movement,
The reclining mechanism according to claim 2, wherein movement of the protrusion is restricted at both ends of the recess in the rotation direction. The protruding portion is provided on the facing portion,
The reclining mechanism according to claim 3, wherein the concave portion is provided in the plurality of guide portions and the coupling portion.   The reclining device according to claim 2, further comprising an urging member that urges the slide cam toward the first position.   The reclining mechanism according to claim 5, wherein the biasing member is disposed between the slide cam and the coupling portion and is supported by the coupling portion. The base plate is fixed to the seat cushion;
The reclining device according to any one of claims 1 to 6, wherein a moving direction of the slide cam is set in a vertical direction.   The reclining mechanism according to any one of claims 2 to 6, wherein the lock gear is rotatably supported by the base plate.   The lock gear is formed in an elongated shape extending along a circumferential direction of the internal gear, and has the lock-side pressed portion and the release-side pressed portion on one end side in the longitudinal direction. Item 9. The reclining mechanism according to Item 8. The lock-side pressed portion is disposed on the radially inner side of the internal gear with respect to the release-side pressed portion,
The slide cam includes a lock-side pressing portion that presses the lock-side pressed portion, a release-side pressing portion that is provided on the outer side in the radial direction than the lock-side pressing portion, and presses the release-side pressed portion; A connecting portion that connects the lock-side pressing portion and the release-side pressing portion;
The reclining mechanism according to claim 9, wherein the release-side pressing portion is formed in an arc shape along an inner peripheral surface of the internal gear.   The release-side pressing portion includes a main body portion formed in an arc shape along the inner peripheral surface of the internal gear, and projects radially inward from an end portion of the main body portion to contact the release-side pressed portion. The reclining mechanism according to claim 10, further comprising an abutting portion in contact with the reclining mechanism.   The reclining mechanism according to claim 11, wherein a contact surface of the contact portion with the release-side pressed portion is a curved surface.   The gap according to any one of claims 10 to 12, wherein a gap is formed between the coupling portion and one end of the lock gear when the lock gear is in the release posture. Reclining mechanism.

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