JPH0520644U - Seat reclining mechanism - Google Patents

Abstract

(57) [Abstract] [Purpose] In a seat reclining mechanism that is assembled between both hinge plates with a ring gear, a sun gear, and a planetary gear as components, a fine adjustment function and a large adjustment function of the seat back inclination angle are provided in the same mechanism. Give. [Structure] The operation shaft 14 is assembled so as to be movable in the axial direction, and the ring gear 1 on one hinge plate 11 is mounted.
The sun gear 15 and the planetary gears 16a to 16c are provided on the opposite side of the hinge plate 12 from the other side 1c.
Is formed in a state in which the other hinge plate 12 is disengaged from the ring gear 12c, and the support plates 13a and 13b, the operating shaft 14, the sun gear 15, and the planetary gears 16a to 16c are attached to the hinge plate 1
The spring 17 is elastically urged to the 2 side and assembled, and the ring gear 12c of the planetary gears 16a to 16c is disengaged by pressing the operation shaft 14 in the axial direction.

Description

[Detailed description of the device]

The present invention relates to a seat reclining mechanism.

[Industrial application]

As shown in Japanese Utility Model Laid-Open No. 60-101956, which is a type of reclining mechanism for a seat, it is integrally provided on a hinge plate fixed to the seat cushion side that constitutes the seat. A first ring gear and a hinge plate fixed to the seat back side, which is integrally provided on the hinge plate and has a number of teeth different from the number of teeth of the first ring gear and is coaxial with the ring gear. No. 2 ring gear, a sun gear that is physically assembled on the operation shaft that rotatably passes through the shaft center portions of these two ring gears, and is located in the central portion of the two ring gears, and the outer circumference of the sun gear and the One or a plurality of planetary gears arranged between the inner circumferences of both ring gears and meshing with these three gears, and the planetary gears are rotatably supported and rotatably mounted on the operation shaft. There is known a seat reclining mechanism including a pair of left and right support plates.

[Prior art]

In this type of reclining mechanism, the planetary gear is rotated by rotating the operating shaft to rotate the sun gear of the body, and both ring gears are relatively rotated due to the difference in the number of teeth. It adjusts the tilt angle of the back and forth direction of the bag. The reclining mechanism of this type has an advantage that the tilt angle of the seat back in the front-rear direction can be finely adjusted in a stepless manner. However, since the reclining mechanism has a function of finely adjusting the front-back inclination angle of the seatback in a stepless manner, when adjusting the seatback inclination angle largely, it takes time. Therefore, there is a problem that the tilt angle cannot be adjusted quickly.

In order to deal with such a problem, reclining having both a stepless adjustment mechanism capable of steplessly finely adjusting the longitudinal inclination angle of the seatback and a stepwise adjustment mechanism capable of making a large stepwise adjustment. The mechanism is disclosed in Japanese Utility Model Publication No. 61-60852. Since the reclining mechanism has both of the above-mentioned functions, there is an advantage that the inclination angle of the seatback can be finely adjusted and can be quickly and largely adjusted.

[0005]

[Problems to be solved by the device]

 By the way, the latter reclining mechanism described above has the above-mentioned advantages, but on the other hand, since it has both a stepless adjustment mechanism and a stepped adjustment mechanism, the structure is extremely complicated and each meshing mechanism of both mechanisms is very complicated. Since each part has a play, there is a problem that the play becomes large as a whole.

Therefore, an object of the present invention is to provide the former reclining mechanism described above, that is, a first ring gear integrally provided on a hinge plate fixed to a seat cushion side forming a seat, A second ring gear that is integrally provided on the hinge plate fixed to the seat back side and has a number of teeth different from the number of teeth of the first ring gear and is positioned coaxially with the ring gear; A sun gear that is physically assembled on the operating shaft that rotatably passes through the shaft center of the ring gear and that is located in the center of both ring gears; And one or more planetary gears that mesh with the gears of these three members and a pair of left and right support plates that rotatably support the planetary gears and are rotatably mounted on the operation shaft. In the seat reclining mechanism including the above, there is a need to solve the above-mentioned problem of the latter reclining mechanism.

[0007]

[Means for Solving the Problems]

 According to the present invention, in the former type of reclining mechanism, the operation shaft is assembled so as to be movable in the axial direction, and one of the hinge plates is provided with a ring gear on a side opposite to the other hinge plate. A housing portion is formed to house the sun gear and the planetary gear in a state where they are disengaged from the ring gear of the other hinge plate, and the operation shaft, the sun gear, and the planetary gear are elastically biased toward the other hinge plate by a spring. It is characterized by being assembled afterwards.

[0008]

[Operation and effect of the device]

 In the reclining mechanism having such a configuration, the operating shaft, the sun gear, both support plates, and the planetary gear can be integrally moved in the axial direction by pressing the operating shaft in the axial direction against the spring. When the operating shaft is in the original position, the planetary gear is in mesh with both ring gears, and when the operating shaft is in the moving position, the planetary gear is out of mesh with the other ring gear, and only one ring gear is meshed. It is in the state of having done. Therefore, by rotating the operation shaft when it is in the original position, the original fine adjustment function originally possessed by this type of reclining mechanism can be exhibited. When the operating shaft is in the moving position, both hinge plates are free from each other. If the seat back is tilted while the operating shaft is pressed and then the operating shaft is returned to its original position, -The tuck is quickly adjusted to the desired tilt angle.

[0009]

【Example】

 BEST MODE FOR CARRYING OUT THE INVENTION A seat reclining mechanism according to the present invention is shown in FIGS. 1 and 2 for explaining an embodiment of the present invention with reference to the drawings. As shown in FIG. 3, the reclining mechanism 10 is arranged between a seat cushion 21 and a seat back 22 which form a seat, and adjusts the inclination angle of the seat back 22 in the front-rear direction by an external operation. ..

The reclining mechanism 10 includes a first hinge plate 11 fixed to the negative side of the seat cushion 21, a second hinge plate 12 fixed to the negative side of the seat back 22, support plates 13a and 13b, and an operation. The shaft 14, the sun gear 15, the three planetary gears 16a to 16c, and the disc spring 17 are main constituent members.

The first hinge plate 11 has a circular deep recess 11b above the mounting portion 11a for the seat cushion 21, and the opening edge of the recess 11b is formed in the first ring gear 11c. The bottom side of the first ring gear 11c is formed into a circular housing portion 11d. The first ring gear 11c has 47 teeth. The second hinge plate 12 has a circular shallow recess 12b below the mounting portion 12a for the seat back 22, and the opening edge of the recess 12b is formed in the second ring gear 12c. The ring gear 12b is formed to have the same diameter as the first ring gear 11b and has 50 teeth. The first hinge plate 11 is fixed to the rear side of the seat cushion 21 by the mounting portion 11a, and the second hinge plate 12 is fixed to the lower side of the seat back by the mounting portion 12a. , Both ring gears 11c and 12c are arranged coaxially in parallel with each other. Each of the hinge plates 11 and 12 is attached to the sheet cushion 21 side or the sheet back 22 side by support pins 18a to 18c.

The operating shaft 14 has a stepped cylindrical shape, and includes a first spline portion 14a formed at an intermediate portion and a second spline portion 14b formed at an outer end portion. In the operation shaft 14, the shaft center portions of the ring gears 11c and 12c of the hinge plates 11 and 12 are rotatably and slidably penetrated in the axial direction, and are housed in the hinge plates 11 and 12, respectively. The shaft centers of the supporting plates 13a and 13b and the sun gear 15 are penetrated. The sun gear 15 is spline-fitted at the first spline portion 14a of the operating shaft 14 and is assembled so as to be slidable in the axial direction, and both support plates 13a and 13b are axially mounted on the operating shaft 14. It is slidably attached to. An operation knob 14c is spline-fitted and fixed to the second spline portion 14b of the operation shaft 14. The operating shaft 14 is attached to both hinge plates 11 and 12 by a washer 18e and a nut 18d.

The sun gear 15 has ten teeth, rotates integrally with the operation shaft 14, and is located at the center of the inner circumference of both ring gears 11c and 12c. Each planetary gear 16a-16c has 19 teeth, is rotatably assembled to each support plate 13a, 13b, and meshes with both ring gears 11c, 12c and sun gear 15. In the reclining mechanism 10, a disc spring 17 is provided between the bottom of the recess 11b of the first hinge plate 11 and the support plate 13b. The disc spring 17 is fitted on the operation shaft 14 and urges the sun gear 15 and the planetary gears 16a to 16c to the second hinge plate 12 side via the support plate 13b.

In this state, the operating shaft 14 is located at the set original position, and the planetary gears 16a to 16c are meshed with the ring gears 11c and 12c while meshing with the sun gear 15. Further, in this state, the operation shaft 14 can be slid in the axial direction by pressing it against the disc spring 17 in the axial direction, and at the time of sliding, the sun gear 15 and the planetary gears 16a to 16c are integrally formed. In the circular housing portion 11d, the planetary gears 16a to 16c are disengaged from the second ring gear 12c.

In the reclining mechanism 10 having such a configuration, the tilt angle of the seat back 22 in the front-rear direction is adjusted by rotating and rotating the operation knob 14c with the operation shaft 14 in the original position. You can By this operation, the sun gear 15 rotates around the operation shaft 14 and the body, and the planetary gears 16a to 16c meshing with the sun gear 15 rotate. As a result, the planetary gears 16a to 16c try to rotate both ring gears 11c and 12c, but due to the difference in the number of teeth of both ring gears 11c and 12c, a relative rotation occurs between the two gears 11c and 12c, so that the second hinges. The plate 12 rotates in the front-rear direction, and the inclination angle of the seat back 22 in the front-rear direction is finely adjusted in a stepless manner according to the amount of rotation operation of the operation knob 14c.

In addition, since the ring gears 11c and 12c, the planetary gears 16a to 16c, and the sun gear 15 perform a locking action against a load that rotates the second hinge plate 12 from the seatback 22 side, The seat back 22 is held in an arbitrary adjusted position.

In the reclining mechanism 10, if the operation shaft 14 is axially pressed against the disc spring 17 while the operation shaft 14 is in the original position, the operation shaft 14 slides in the axial direction. When sliding, the sun gear 15 and the planetary gears 16a to 16c are integrally moved in the same direction and moved to the circular housing portion 11d, and the meshing of the planetary gears 16a to 16c with the second ring gear 12c is released. .. Therefore, the second hinge plate 12 is in a free state with respect to the first hinge plate 11, and the seatback 22 can be tilted while the operation shaft 14 is being pressed, so that the seatback 22 has a desired tilt angle. Can be adjusted.

After such adjustment, if the pressing force on the operating shaft 14 is released and the operating shaft 14 is returned to the original position, the sun gear 15 and the planetary gears 16a to 16c are returned to the original position together with the operating shaft 14, and The planetary gears 16a to 16c mesh with the second ring gear 12c to couple the second hinge plate 12 to the first hinge plate 11, and the seatback 22 is fixed at a desired inclination angle. Such an adjusting operation is performed very quickly because the second hinge plate 12 is completely free from the first hinge plate 11 without any restriction.

By the way, although the reclining mechanism 10 has a fine adjustment function and a large adjustment function of the inclination angle of the seat back 22 as described above, these functions are utilized only by the conventional fine adjustment mechanism. Since it is configured so that it can be exerted as a whole, the total rattling of the meshing part of each gear is less than that of the conventional reclining mechanism that has both a stepless adjustment mechanism and a stepped adjustment mechanism. The structure is simple.

[Brief description of drawings]

FIG. 1 is a sectional view of a reclining mechanism according to the present invention.

FIG. 2 is an exploded perspective view of the reclining mechanism.

FIG. 3 is a perspective view of a vehicle seat in which the reclining mechanism is assembled.

[Explanation of symbols]

10 ... Reclining mechanism, 11, 12 ... Hinge plate, 11c, 12c ... Ring gear, 11d ... Circular accommodating part, 14 ... Operation shaft, 15 ... Sun gear, 16a-16c ...
Planetary gears, 17-disc springs, 21-sheet cushions, 22-sheet sheets.

Claims (1)

[Scope of utility model registration request] 1. A first ring gear integrally provided on a hinge plate fixed to a seat cushion side which constitutes a seat, and a first ring gear integrally provided on a hinge plate fixed to a seat back side. A second ring gear having a number of teeth different from the number of teeth of the first ring gear and positioned coaxially with the ring gear; A sun gear that is physically assembled and located at the center of the ring gears; and one or more planetary gears that are arranged between the outer circumference of the sun gears and the inner circumferences of the ring gears and that mesh with these three gears. In a seat reclining mechanism including a pair of left and right support plates rotatably supporting the planetary gear and rotatably mounted on the operation shaft, the operation shaft is moved in the axial direction. The sun gear and the planetary gear are housed in a position on one side of the two hinge plates opposite to the other hinge plate in a state of being disengaged from the ring gear of the other hinge plate. Forming a housing,
A reclining mechanism for a seat, characterized in that the operation shaft, the sun gear and the planetary gear are elastically biased and assembled to the other hinge plate side.