JP3993517B2 - Reclining device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a reclining device that can arbitrarily adjust an inclination angle of a seat back of a vehicle seat, and in particular, an internal gear that is partially meshed and an external gear that has fewer teeth than the internal gear move a meshing portion. It is related with the reclining apparatus which can adjust an inclination angle steplessly by what is called a Taumel mechanism (differential transmission mechanism) which carries out rocking | fluctuation rotation relatively.
[0002]
[Prior art]
In a conventional vehicle seat reclining device, an example in which a differential transmission mechanism is employed as a means for adjusting the inclination angle of the seat back uses a substantially circular handle as the operating means. (For example, see Patent Document 1)
The handle is directly connected to a rotary shaft that supports the internal gear and the external gear of the Taumel mechanism, and the tilt angle of the reclining device can be adjusted by rotating the handle. Further, as another operation means, a substantially circular handle is connected to the rotation shaft, and a grip portion that is rotatable with respect to the handle is provided on the surface portion near the outer periphery of the handle to facilitate the operation of the substantially circular handle. There is something. (For example, see Patent Document 2)
[0003]
[Patent Document 1]
JP 59-14809 (FIGS. 1 and 2)
[Patent Document 2]
Japanese Utility Model Publication No. 50-26100 (Fig. 2)
[0004]
[Problems to be solved by the invention]
However, in the reclining device having the Taumel mechanism using the operation means by the handle of the conventional patent document 1, since the handle is directly connected to the rotating shaft, the handle is rotated a lot in order to largely tilt the seat back. When it is necessary, and when many operations are required, the hand must be released from the handle and re-gripped, and continuous rotation cannot be performed.
[0005]
Further, in the reclining device having the conventional operation means as seen in Patent Document 2, the handle is directly connected to the rotating shaft as in the prior art of Patent Document 1, so that the seat back is largely inclined. It is necessary to rotate the handle a lot. The grip part that can rotate with respect to the handle is provided on the surface part close to the outer periphery of the handle to enable continuous rotation. However, since the distance from the rotation axis to the grip part is short, the rotation axis is rotated. There is a problem that the operating force is large. If the distance from the gripping part to the rotating shaft is increased, the operating force will be reduced, but the operating range of the lever member to the handle or the gripping part will be widened, and it will rotate too long from the gripping part due to space constraints of other vehicle members etc. There was a problem that the length to the shaft could not be secured.
[0006]
[Means for Solving the Invention]
Therefore, the present invention is a reclining device that holds the seat back in a tiltable manner with respect to the seat cushion, in a state in which the internal gear and the external gear slightly smaller in number than the internal gear are partially engaged. In a reclining device having a rotary shaft and a differential transmission mechanism configured to be supported by an eccentric shaft portion with respect to the rotary shaft, a reciprocating rotary operation mechanism capable of continuously adjusting an operation angle is connected to the rotary shaft, and a differential A speed increasing means is provided between the transmission mechanism and the reciprocating rotation operating mechanism, and a mass body for increasing the moment of inertia of the rotating shaft is provided between the reciprocating rotating operation mechanism and the speed increasing means . When formed in this way, the differential transmission mechanism can be tilted by reciprocating (pumping) an operation lever provided in the reciprocating rotation operation mechanism within a predetermined angle. Because it does not operate, it is less subject to spatial restrictions due to the relationship with other parts inside the vehicle, and the length from the grip of the operating lever to the center of the rotating shaft of the differential transmission mechanism is increased compared to conventional reclining devices. This makes it easy to reduce the operating force.
[0007]
Further, the present invention is characterized in that a speed increasing means between the differential transmission mechanism and the reciprocating rotational operation mechanism. When formed in this way, the number of reciprocating operations of the reciprocating operation mechanism when the seat back is tilted to a desired angle is reduced, and the slow operation speed, which is a drawback of the differential transmission mechanism, is improved. Can do.
[0008]
Furthermore, the present invention is characterized in that a mass increase the moment of inertia of the rotating shaft between the speed increasing means and the reciprocating rotational operation mechanism. If formed in this way, even when the operation lever during the reciprocating rotation operation is returned to the neutral position, the next rotation operation can be performed without interrupting the rotation of the rotation shaft of the differential transmission mechanism. Since it can operate continuously, it is possible to maintain a good feeling of operation.
[0009]
Further, the present invention is characterized in that the reciprocating rotation operation mechanism is a stepless adjustment mechanism capable of adjusting an operation angle steplessly. If formed in this way, the rotating shaft of the differential transmission mechanism can be rotated at an arbitrary angle, so that a finer adjustment operation becomes possible.
[0010]
Further, the present invention is characterized in that the speed increasing unit is a planetary gear. If formed in this way, the speed increasing means can be installed coaxially with the rotating shaft of the differential transmission mechanism with a simple configuration, so that the entire reclining device can be compactly assembled and easily installed on the vehicle seat. It becomes.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side view of a vehicle seat 100 to which a reclining device according to the present invention is applied. A seat rail 102 that can slide back and forth is fixed to the vehicle floor 101, and a seat bracket 103 is fixed on the seat rail 102, and the seat cushion 104 and the reclining device 1 according to the present invention are disposed on the seat bracket 103. Has been.
[0012]
FIG. 2 shows a side view of the reclining device 1 according to the present invention. The reclining device 1 has a seat back side bracket 2 and a fixed side bracket 3 fixed to the seat bracket 103 on the seat cushion side, and differential transmission so that the seat back side bracket 2 can tilt with respect to the fixed side bracket 3. Connected by mechanism 4. The seat back 105 is fixed to the seat back side bracket 2 by a known method. Further, a speed increasing mechanism 5 using a planetary gear and a reciprocating rotation operating mechanism 6 that can be adjusted steplessly are arranged coaxially with the rotating shaft 7 of the differential transmission mechanism 4. A substantially L-shaped operating lever 8 is fixed to the other end connected to the speed mechanism 5.
[0013]
As in the conventional example, the differential transmission mechanism 4 is a state in which an internal gear and an external gear having a slightly smaller number of teeth than the internal gear are partially meshed by a rotating shaft and an eccentric shaft portion with respect to the rotating shaft. The internal gear and the external gear are relatively swung and rotated by the swiveling movement of the meshing portion accompanying the rotation of the rotary shaft. In this embodiment, the internal gear 9 fixed to the fixed side bracket 3 and the external gear 10 fixed to the seat back side bracket 2 with a smaller number of teeth than the internal gear 9 by one tooth are provided on the rotary shaft. 7 and the eccentric shaft portion 7a of the rotating shaft 7 are partially engaged with each other.
[0014]
FIG. 3 is a cross-sectional view taken along the line BB in FIG. 2 and shows the speed increasing mechanism 5. The speed increasing mechanism 5 transmits the operating force to the first gear 11 fitted to the serration portion 7b of the rotary shaft 7 and the second gear 12 arranged rotationally symmetrically about the first gear 11. The transmission member 13 is provided. The second gear 12 is rotatably inserted into a shaft 14 that is protruded from a shaft hole 3 a formed in the fixed bracket 3 and fixed by a fixing means such as caulking, and an E-ring 15 is provided so as not to come off the shaft 14. The shaft 14 is fitted. The method for preventing the shaft 14 from coming off is not limited to the above-described method, and it is possible to use a means such as inserting a washer or welding. In this embodiment, two second gears 12 are provided at rotationally symmetric positions of the rotating shaft 7, but the number can be increased when strength is required.
[0015]
FIG. 4 is a component diagram showing the transmission member 13 and shows a cross section. The transmission member 13 includes a central cylindrical portion 13b that forms a central hole 13a through which the shaft portion 7c of the rotating shaft 7 can be inserted, a circular plate portion 13c that spreads radially from the central cylindrical portion 13b, and a circular plate portion. An outer peripheral cylindrical portion 13d extending in the direction opposite to the central cylindrical portion 13b in the axial direction from the outer peripheral edge of 13c, and protruding in the same direction as the central cylindrical portion 13a in the axial direction from a substantially intermediate position in the radial direction of the disc portion 13c. It consists of a clutch part 13e and a mass body part 13f formed with a width in the radial direction opposite to the outer cylindrical part 13d. An inner peripheral surface 13g of the clutch portion 13e forms a clutch surface. The diameter of the central hole 13 a of the central cylindrical portion 13 b is formed to be equal to the shaft portion 7 c of the rotating shaft 7. Inner teeth 13h are formed on the inner peripheral surface of the outer peripheral cylindrical portion 13d over the entire periphery, and mesh with the second gear 12.
[0016]
Next, the reciprocating rotation operation mechanism 6 will be described. FIG. 5 is a component diagram of the lever 16 which is a component of the reciprocating rotation operation mechanism 6, and FIG. 6 shows the plate 17. 1 and 2 together, a substantially Y-shaped lever 16 and a substantially disc-shaped plate 17 having two flange portions are fixed to the operation shaft 18. FIG. 7 is a component diagram of the operation shaft 18. The operation shaft 18 is a stepped shaft including an oval portion 18a, a shaft portion 18b, a retainer holding portion 18c, and a square surface portion 18d from the left in FIG. 7, and a central shaft hole 18e is formed at the center. The lever 16 has a center hole 16a having a substantially oval shape in the center, an engagement hole 16b that engages with the protrusion 17e of the plate 17 around the center hole 16a, and a mounting hole 16c of the operation lever 8 in the Y-shaped end portion. It has a column portion 16d that extends in the axial direction. The plate 17 has a protrusion 17e protruding in the axial direction around a center hole 17a formed in the center of the flat portion 17b, and a wall extending in the opposite direction to the protrusion 17e from the outer peripheral edge of the flat portion 17b. A stopper portion 17c and a flange portion 17d are formed radially outward from the portion.
[0017]
FIG. 8 is a cross-sectional view taken along the line CC of FIG. 2 and shows the clutch mechanism of the reciprocating rotation operating mechanism 6. The cam 22 is a substantially disk-shaped component, and is formed with a cam surface 22a on the side peripheral surface, a square hole 22b at the center, and two protrusions 22c at positions on the outer straight line. The cam surface 22a divided into two parts by the protrusion 22c of the cam 22 has four parts having a low cam height and five parts having a high cam height. The cam 22 that rotates integrally with the operation shaft 18 by fitting the square surface portion 18d of the operation shaft 18 into the square hole 22b is incorporated so as to enter the inside of the clutch portion 13e of the transmission member 13. A wedge-shaped space is formed by the inner peripheral surface 13 g of the clutch portion 13 e and the cam surface 22 a of the cam 22. A total of eight rollers 23 are disposed in each of the places where the cam height of the wedge space is low.
[0018]
FIG. 9 is a component diagram showing the retainer 24. The retainer 24 has a hole 24a through which the operation shaft 18 is inserted at the center, and has eight holding portions 24b extending in the axial direction on the periphery. Further, a column part 24c extending in the axial direction in the opposite direction to the holding part 24b is provided at the upper part of the peripheral edge. The hole 24 a is rotatably inserted into the retainer holding portion 18 c of the operation shaft 18 and is assembled in a state of being sandwiched between the cam 22 and the cover 19. The holding portion 24b is interposed between each of the eight rollers 23 arranged in the wedge space, and in a free state (a state when the reclining device is not operated), the roller 23 has a cam height of the cam 22. Keep in the lower part. In this state, the transmission member 13 can freely rotate.
[0019]
FIG. 10 is a component diagram of the cover 19 that covers the speed increasing mechanism 5 and the clutch mechanism of the reciprocating rotation operating mechanism 6. The cover 19 has a bottomed cylindrical shape, and the terminal having an open cylindrical portion is fixed to the fixed bracket 3. A bearing portion 19 a rising in the axial direction is provided at the center of the bottom wall portion, and the inner diameter of the bearing portion 19 a is equal to the outer diameter of the shaft portion 18 b of the operation shaft 18. A first cut-and-raised portion 19b and second cut-and-raised portions 19c and 19c for locking the retainer neutral spring 20 and the operation lever neutral spring 21 are provided around the bearing portion 19a of the bottom wall portion. Further, a fan-shaped hole 19d is formed on the radially outer side adjacent to the first cut-and-raised portion 19b. The lever 16 and the plate 17 are inserted into a substantially oval center hole 16a and a center hole 17a on one end side of the operation shaft 18, and a retainer holding portion 18c of the operation shaft 18 and the plate 17 are connected to each other. The bearing 19a of the cover 19 is assembled so as to be sandwiched, and then the oval shaped portion 18a of the operation shaft 18 is rotatably attached to the cover 19, that is, the stationary bracket 3 by a fixing method such as caulking.
[0020]
FIG. 11 is a cross-sectional view taken along the line D-D in FIG. 2 and shows a mounting state of the spring for returning to the neutral position. The retainer neutral spring 20 is a leaf spring obtained by bending a plate material slightly by one turn, and is biased in a direction to close the hook portions 20a, 20a. The control lever neutral spring 21 is a coil spring obtained by bending a wire rod twice, and its end portion is bent toward the center of the shaft to form hook portions 21a and 21a, so that the outer diameter of the coil shape increases. Be energized. The retainer neutral spring 20 is arranged such that its circular portion wraps around the outer diameter of the bearing portion 19 a of the cover 19, and the hook portions 20 a and 20 a sandwich the first cut-and-raised portion 19 b of the cover 19. It is locked to. The operation lever neutral spring 21 is disposed along the outer periphery of the wall portion of the plate 17, and the hook portions 21 a and 21 a are engaged with the second cut and raised portions 19 c and 19 c of the cover 19.
[0021]
The column portion 16d of the lever 16 has a locking surface 16e at an end portion of the column portion 16d in a free state on the outer side in the radial direction of the second cut-and-raised portions 19c and 19c and inside the operation lever neutral spring 21. The operation lever is in contact with the hook portions 21 a and 21 a of the neutral spring 21. Similarly, the column portion 24 c of the retainer 24 is engaged so as to pass through the fan-shaped hole 19 d of the cover 19 and be sandwiched between the hook portions 20 a and 20 a of the retainer neutral spring 20. The operation lever 8 and the reciprocating rotation operation mechanism 6 are held in a neutral position by the column portion and the spring.
[0022]
Based on the above configuration, the operation will be described. In the neutral state shown in FIG. 1, the operation lever 8 is held at the neutral position N, and when the operation lever 8 is rotated in either direction U or D from the neutral position N, the lever connected to the operation lever 8 The 16 column portions 16d push either of the hook portions 21a and 21a, and rotate against the urging force of the operation lever neutral spring 21. When the operating lever 8 is moved slightly downward (D direction), the lever 16, the plate 17, the operating shaft 18 and the cam 22 are rotated counterclockwise from the state shown in FIG. 12 (A) to the state shown in FIG. 12 (B). Turn around. In the state shown in FIG. 12B, the roller 23 bites into the wedge space, the cam 22 and the transmission member 13 are locked, and when the operation lever 8 is further rotated, the cam 22 and the transmission member 13 rotate integrally. . When the transmission member 13 is rotated, the second gear 12 meshed with the internal teeth 13h provided on the transmission member 13 is rotated, and the rotation is transmitted to the first gear 11 fitted to the rotary shaft 7, and the difference is transmitted. The power transmission mechanism 4 operates. The rotation of the operating lever is increased by the gear ratio of the internal teeth 13h, the first gear 11 and the second gear 12 at this time. Due to the operation of the differential transmission mechanism 4, the seat back 105 tilts forward with respect to the seat cushion 104.
[0023]
FIG. 13 is a cross-sectional view showing the operating state of the retainer neutral spring 20 and the operation lever neutral spring 21, and corresponds to FIG. When the operation lever 8 rotates as described above, the column portion 16d of the lever 16 integrated with the operation shaft 18 rotates leftward in the drawing, and the hook portion 21a of the operation lever neutral spring 21 is moved to the position shown in FIG. To move. The other hook portion 21a remains locked to the second cut-and-raised portion 19c of the cover 19, and the operation lever neutral spring 21 is deformed so that its coiled diameter is reduced, and the operation shaft 18 is moved to the neutral position N. Energize in the direction. Further, when the cam 22 and the transmission member 13 are locked and rotated together, the column portion 24c of the retainer 24 rotates in the same direction, and moves one hook portion 20a of the retainer neutral spring 20 as shown in the figure. The other hook portion 20 a remains locked to the first cut and raised portion 19 b of the cover 19. Accordingly, the retainer neutral spring 20 is deformed so that the circular spring portion is expanded, and the retainer 24 and the roller 23 are urged in the neutral position N direction.
[0024]
When the operation lever 8 continues to rotate in the same direction, the end surface 17f of the stopper portion 17c of the plate 17 that operates integrally with the lever 16 is locked by the operation lever neutral spring 21 of the second cut and raised portion 19c of the cover 19. The rotation angle of the operation lever 8 is regulated by abutting against the end surface opposite to the one to be operated. When the operating lever 8 is moved to the full stroke until the rotation angle is regulated or in the middle of the stroke, the finger is loosened or released to return the operating lever 8 to the neutral position N. 6 until the cam 22 and the transmission member 13 are unlocked and return to the neutral position N, the retainer 24 is urged toward the neutral position N by the retainer neutral spring 20, so that the roller 23 enters the wedge space on the opposite side. The cam 22 and the transmission member 13 are not locked. Then, the operation lever 8, the lever 16, the plate 17, the roller 23, and the retainer 24 return to the neutral position N with the position of the transmission member 13 as it is. By repeating this operation, a reciprocating rotation operation can be performed, and the tilt angle of the reclining device can be adjusted. In addition to this embodiment, the reciprocating rotation operation mechanism can also use a switching mechanism (for example, a ratchet type operation mechanism) based on normal tooth engagement.
[0025]
Further, when the operating lever is vigorously operated when the torque applied to the transmission member 13 from the roller 23 is lost, the operating lever 8 is moved to the full stroke until the rotation angle is regulated as described above. After the operation is performed or during the stroke, the finger is loosened or released and the operation lever 8 is amplified by the mass body portion 13f of the transmission member 13 until the operation lever 8 is returned to the neutral position N until the next rotation operation is performed. Since the moment of inertia continues to rotate the transmission member 13, the angle adjustment is performed continuously.
[0026]
【The invention's effect】
As described above, according to the present invention, the differential transmission mechanism can be tilted at an arbitrary angle by reciprocating the operation lever provided in the reciprocating rotation operation mechanism within a predetermined angle. Because it operates only within an angle, it is less subject to spatial restrictions due to the relationship with other parts inside the vehicle, compared to conventional reclining devices, and the length from the grip of the operating lever to the center of the rotating shaft of the differential transmission mechanism There is an effect that the length can be increased and the operation force can be reduced.
In addition, the speed increasing mechanism reduces the number of reciprocating operations of the reciprocating operation mechanism when the seatback is tilted to a desired angle, and can improve the slow operation speed, which is a drawback of the differential transmission mechanism. There is an effect.
[0027]
Further, by providing the mass body, the next rotation operation can be performed without interrupting the rotation of the rotation shaft of the differential transmission mechanism even when the operation lever during the reciprocating rotation operation is returned to the neutral position. Since the rotating shaft can be operated continuously, there is an effect that the feeling of operation can be kept good.
In addition, by using planetary gears as the speed increasing means, it can be installed coaxially with the rotating shaft of the differential transmission mechanism with a simple configuration, so that the entire reclining device can be compactly integrated into the vehicle seat. There is an effect that it is easy to install.
[Brief description of the drawings]
FIG. 1 is a side view of a vehicle seat to which a reclining device according to the present invention is applied.
FIG. 2 is a side view showing a reclining device.
3 is a cross-sectional view taken along line BB in FIG. 2, and is a cross-sectional view showing a speed increasing mechanism.
FIG. 4 is a component diagram illustrating a transmission member 13;
FIG. 5 is a component diagram showing the lever 16;
6 is a component diagram showing a plate 17. FIG.
7 is a component diagram showing an operation shaft 18. FIG.
8 is a cross-sectional view showing a clutch mechanism of a reciprocating rotation operation mechanism, and corresponds to a cross-sectional view taken along line CC in FIG.
9 is a component diagram showing the retainer 24. FIG.
10 is a component diagram showing the cover 19. FIG.
11 is a cross-sectional view showing a retainer neutral spring and an operation lever neutral spring, and corresponds to a cross-sectional view taken along line DD of FIG.
12A and 12B are cross-sectional views showing the operation of the reciprocating rotation operation mechanism, in which FIG. 12A shows a free state and FIG. 12B shows a state where the cam is slightly rotated.
13A and 13B are cross-sectional views showing the operation of the retainer neutral spring and the operation lever neutral spring, where FIG. 13A shows a free state and FIG. 13B shows a state where the operation shaft is rotated.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Reclining apparatus 2 Seat back side bracket 3 Fixed side bracket 4 Differential transmission mechanism 5 Speed increasing mechanism 6 Reciprocating rotation operation mechanism 7 Rotating shaft 8 Operation lever 9 Internal gear 10 External gear 11 First gear 12 Second gear 13 Transmission member 14 Shaft 15 E-ring 16 Lever 17 Plate 18 Operation shaft 19 Cover 20 Retainer neutral spring 21 Operation lever neutral spring 22 Cam 23 Roller 24 Retainer 100 Vehicle seat 101 Vehicle floor 102 Seat rail 103 Seat bracket 104 Seat cushion 105 Seat back

Claims (1)

A reclining device that holds the seat back in a tiltable manner with respect to the seat cushion, in which the internal gear and the external gear having a slightly smaller number of teeth than the internal gear are partially meshed with each other, and the rotation shaft and the rotation In a reclining device having a differential transmission mechanism that is supported by an eccentric shaft portion with respect to a shaft,
A reciprocating rotation operating mechanism capable of adjusting the operation angle steplessly to the rotating shaft is connected , a speed increasing means is provided between the differential transmission mechanism and the reciprocating rotating operating mechanism, and the speed increasing means is provided between the reciprocating rotating operating mechanism and the speed increasing means. A reclining device provided with a mass body for increasing the moment of inertia of a rotating shaft .

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