JP2002067751A - Rotation adjustment mechanism for vehicle seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply compose a rotation adjustment mechanism comprising a lower base, an upper base, and a holder member of the minimum number of parts necessary, provide an automatically aligning function, securely transmit impact load from the holder member to the lower base, reduce deformation, and reduce plate thickness to achieve light weight. SOLUTION: An engagement slide part 21 having a roughly inverted U-shaped cross section is formed on the lower base 11. The upper base 13 is disposed through the engagement slide part 21 of the lower base 11 and a first rolling member 23. A slide part 25 having a roughly inverted U-shaped cross section to be engaged with the engagement slide part 21 is formed on the holder member 15. A second rolling member 27 is provided between the slide part 25 of the holder member 15 and the engagement slide part 21 of the lower base 11. A roughly S-shaped bearing part 34 is formed in such a way that a line connecting the centers of the first rolling member 23 and the second rolling member 27 to each other is inclined.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotation adjusting mechanism for a vehicle seat which supports a seat body on a floor of a vehicle cabin so as to be rotatable. More specifically, the mechanism is fixed to the floor of the vehicle cabin. A lower adjustment base for a vehicle seat, comprising: an annular lower base, an annular upper base to which a seat body is fixed, and a holder member fixed to an outer peripheral edge of the upper base and holding the lower base. .

[0002]

2. Description of the Related Art Conventionally, there has been known a rotary type vehicle seat which employs a structure in which the direction of the seat can be changed and adjusted according to the preference and demand of a seated person. That is, this kind of rotary type vehicle seat has a structure in which a rotation adjusting mechanism such as a face-to-face type or a shaft-up rotary type is interposed between the seat body floor surface below the seat body. Has been proposed in the past.

[0003] For example, Japanese Patent Application Laid-Open No. H8-11600 discloses an annular lower rail fixed to the floor of a vehicle and an annular sliding portion having a substantially inverted U-shaped cross section. An upper rail having a sliding portion having a substantially U-shaped cross section, and a bracket for fixing the upper rail to a seat cushion frame, wherein a ball is interposed between the annular sliding portion of the lower rail and the bracket. A seat rotating device is disclosed in which an outer wall surface of an annular sliding portion in contact with the ball is formed as a tapered surface which is lowered inward and has an automatic centering function.

Japanese Unexamined Patent Application Publication No. 11-129794 discloses a lower plate provided on the floor side and an upper plate provided on the seat side and supported by the lower plate via balls and rotating on a horizontal plane, and a caulking pin. And a set plate that holds the upper plate together with the lower plate via a ball. Then, by crushing the boss portion of the set plate, the facing distance between the set plate and the lower plate is adjusted and changed, so that the rotational operation torque of the upper plate is made appropriate.

[0005]

However, in the conventional seat rotating apparatus disclosed in Japanese Patent Application Laid-Open No. HEI 8-11600, the lower rail is slidably engaged with an annular sliding portion having a substantially inverted U-shaped cross section. Since the upper rail having a sliding portion having a substantially U-shaped cross section is opposed via the shoe, the sliding resistance is increased, and a sufficient centering function cannot be obtained, causing variations. There was a fear. When the impact load from the seat side is applied to the bracket and the upper rail, it is easily deformed, the thickness cannot be reduced, the weight increases, the sliding resistance increases, and there is a disadvantage that simple and quick rotation operation cannot be performed. If the position of the ball between the bracket and the lower rail is located above the tapered surface, the bracket will be at a higher position in the vertical direction, and the position of the bolts for fixing the bracket and the upper rail will be higher, thus increasing the height. It could not be lowered. Further, in the rotating device disclosed in JP-A-11-129794, although the length in the height direction can be shortened, the lower plate becomes longer in the horizontal direction, and similarly, the size cannot be reduced. This has the disadvantage that the weight increases and the sliding resistance increases.

SUMMARY OF THE INVENTION It is an object of the present invention to easily configure a rotation adjusting mechanism comprising a lower base, an upper base and a holder member with a minimum number of necessary components and to have an automatic centering function. The impact load can be transmitted more reliably from the holder member to the lower base, the deformation can be reduced, the plate thickness can be reduced, the weight can be reduced, the sliding resistance can be reduced, and the rotating operation force can be reduced. The rotation of the vehicle seat can be easily and quickly adjusted, the height and width can be reduced, the size can be reduced, the rigidity in the vertical direction can be improved, and the cost of the vehicle seat can be reduced. An adjustment mechanism is provided.

[0007]

According to a first aspect of the present invention, there is provided a vehicle seat rotation adjusting mechanism comprising: an annular lower base fixed to a cabin floor side; and an annular upper to which a seat body is fixed. In a vehicle seat rotation adjusting mechanism including a base and a holder member fixed to an outer peripheral edge of the upper base and sandwiching the lower base, an engagement slide having a substantially inverted U-shaped cross section is formed on the annular lower base. A portion is formed, and the upper base is disposed via an engagement sliding portion of the lower base and a first rolling member, and the upper base is engaged with the engagement slide having a substantially inverted U-shaped cross section of the lower base. A sliding portion having a substantially U-shaped cross section is formed to engage with the first portion; a second rolling member is provided between the sliding portion of the holder member and the engaging sliding portion of the lower base; Connecting the centers of the first rolling member and the second rolling member There, characterized in that it is arranged so as to be oblique.

According to a second aspect of the present invention, there is provided a rotation adjusting mechanism for a vehicle seat, wherein a concave portion for receiving a first rolling member is provided at an upper end of a substantially inverted U-shaped cross section of the engaging sliding portion of the lower base. A convex portion for receiving the second rolling member is formed, and the concave portion and the convex portion form a substantially S-shaped receiving portion.

According to a third aspect of the present invention, there is provided a rotation adjusting mechanism for a vehicle seat, wherein a linear portion is formed in a receiving portion for receiving an upper end of the first rolling member of the upper base. .

According to the rotation adjusting mechanism for a vehicle seat according to the first aspect of the present invention, an engagement sliding portion having a substantially inverted U-shaped cross section is formed on the annular lower base, and the upper base is formed on the lower base. Are disposed via the first sliding member and the first rolling member, and the holder member has a substantially U-shaped cross section for engaging with the engaging sliding portion having a substantially inverted U-shaped cross section of the lower base. A sliding portion is formed, a second rolling member is provided between the sliding portion of the holder member and the engaging sliding portion of the lower base, and the first rolling member and the second rolling member are provided. Since the line connecting the centers of the members is arranged so as to be oblique, the impact load from the upper base side is transferred from the sliding part of the holder member to the engaging sliding part of the lower base with a substantially inverted U-shaped cross section. Can be communicated,
Deformation is small, plate thickness can be reduced, weight can be reduced, sliding resistance can be reduced, rotation operation force can be reduced, rotation can be adjusted easily and quickly, and height and width can be reduced. The size can be reduced and the shape can be reduced, and the rigidity in the vertical direction can be improved.

According to the rotation adjusting mechanism for a vehicle seat according to a second aspect of the present invention, the concave portion for receiving the first rolling member is provided at the upper end of the engagement sliding portion of the lower base having a substantially inverted U-shaped cross section. And a convex portion for receiving the second rolling member are formed, and the concave portion and the convex portion form a substantially S-shaped receiving portion. Therefore, the height and width can be reduced to reduce the size. It is possible to reduce the deformation, reduce the thickness of the plate, reduce the weight and reduce the sliding resistance, and reduce the rotational operation force to easily and quickly perform the rotational adjustment.

According to the rotation adjusting mechanism for a vehicle seat according to the third aspect of the present invention, since the receiving portion of the upper base that receives the upper end of the first rolling member has the linear portion, the linear portion is formed. The automatic alignment function can be provided in the shape, and the upper base can be stably held without rattling in the front, back, up, down, and rotation directions, and the thickness can be reduced with less deformation. Thus, the weight can be reduced, the sliding resistance can be reduced, and the rotational operation force can be reduced, and the rotational adjustment can be performed simply and quickly.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A rotation adjusting mechanism for a vehicle seat according to the present invention will be described below in detail with reference to the drawings. 1 to 4
1 shows an embodiment of the present invention. FIG. 1 is an exploded perspective view of a rotation adjustment mechanism of a vehicle seat, FIG. 2 is a plan view of the rotation adjustment mechanism, FIG. 3 is a side view of the rotation adjustment mechanism, and FIG. It is a partial sectional view of a principal part.

A rotation adjusting mechanism for adjusting the rotation of the entire seat around the substantially central portion of the seat as a center of rotation between the seat cushion of the vehicle seat and the floor of the cabin below the seat cushion, thereby enabling the direction of the seat to be arbitrarily adjusted. 10 are provided. As is apparent from FIGS. 1 to 4, the rotation adjusting mechanism 10 includes an annular lower base 11 having a circular opening 12 and a circular opening to which a seat body is fixed and which is rotatably supported with respect to the lower base 11. Annular upper base 1 having 14
3 and a holder member 15 fixed to the upper base 13 and holding the lower base 11 therebetween.

As shown in FIG. 4, the annular lower base 11 is formed on an outer peripheral edge thereof with an engagement sliding portion 21 having a substantially U-shaped cross section protruding upward, and the annular upper base 13 is provided with a lower. The engagement sliding portion 21 of the lower base 11 is disposed on the inner peripheral edge of the holder member 15 through the engagement sliding portion 21 of the base 11 and the first rolling member 23. The sliding portion 25 having a substantially U-shaped cross section is formed so as to protrude downward.

A concave portion 13a is formed in a substantially central portion of the annular upper base 13, a flange portion 13b is formed on the outer peripheral side, and a ball for holding the first rolling member 23 from above on the inner peripheral side. A receiving portion 13c is formed.
A second rolling member 27 is provided between the sliding portion 25 of the holder member 15 and the engaging sliding portion 21 of the lower base 11.

The recess 13a at the substantially central portion of the upper base 13 and the horizontal portion 15a outside the sliding portion 25 of the holder member 15 are formed by a plurality of bolts 31 and nuts 32 in this embodiment. It is fixed. The nuts 32 are welded to the upper base 13 respectively.
By welding the nut 32 to the upper base 13, the lower base 11 and the holder member 15 can be placed on the upper base 13 at the time of assembling, and the bolt 31 can be fixed from above.

An upwardly extending flange portion 15b is formed on the outer peripheral edge of the holder member 15.
b is inserted inside the flange portion 13b of the upper base 13.

The line connecting the centers of the first rolling member 23 and the second rolling member 27 is arranged so as to be inclined at an angle of approximately 45 °. That is, the first rolling member 23 is provided on the upper end of the engagement sliding portion 21 of the lower base 11 having a substantially inverted U-shaped cross section.
A concave portion 35 for receiving the lower end and a convex portion 37 for receiving the second rolling member 27 are formed, and the concave portion 35 and the convex portion 37 form a substantially S-shaped receiving portion 34.

A receiving portion 25 for receiving the lower side of the second rolling member 27 is provided on the inner peripheral side of the sliding portion 25 of the holder member 15.
a is formed. A linear portion 41 is formed at a substantially central portion of the receiving portion 13c for receiving the upper end of the first rolling member 23 of the upper base 13. Due to the presence of the linear portion 41, it is possible to cope with variations in parts during assembly, and to have an automatic centering function.

Further, in the embodiment of the present invention, as shown in FIG. 1, a lever guide portion 43 is formed on the upper base 13 side, and a rotation lever 45 and a lever spring 47 are attached. In addition, a plurality of first rolling members 23 are mounted in a plurality of through holes formed at appropriate intervals in a ring-shaped upper retainer 49, and in the present embodiment, a plurality of the first rolling members 23 are mounted.

Further, an angle regulating plate 51 of the upper base 13 is fixed to the lower base 11 by welding or the like. Further, a plurality of second rolling members 27 are mounted in a plurality of through holes formed at appropriate intervals in the ring-shaped lower retainer 53, and in the present embodiment, twelve second rolling members are mounted. An angle regulating plate 55 of the lower base 11 is fixed to the holder member 15 by welding or the like.

According to the rotation adjusting mechanism for a vehicle seat according to the present invention, the lower base 11 and the floor of the cabin, or the upper base 13 and the seat body, which constitute the rotation adjusting mechanism 10 described above, are connected to each other. A slide mechanism that can adjust the seat in the front-rear direction may be interposed therebetween.

[0024]

As described above, according to the rotation adjusting mechanism for a vehicle seat according to the first aspect of the present invention, an engagement sliding portion having a substantially U-shaped cross section is formed on the annular lower base. The upper base is disposed via an engagement sliding portion of the lower base and a first rolling member, and engages with the holder member with an engagement sliding portion having a substantially inverted U-shaped cross section of the lower base. A sliding portion having a substantially U-shaped cross section is formed, a second rolling member is provided between the sliding portion of the holder member and the engaging sliding portion of the lower base, and the first rolling member is provided. Is arranged so that the line connecting the center of the second rolling member and the
The impact load from the upper base side can be transmitted from the sliding portion of the holder member to the engaging sliding portion having a substantially inverted U-shaped cross section of the lower base. Can reduce the sliding resistance by reducing the weight, reduce the rotating operation force, make the rotation adjustment easy and quick, reduce the height and width, reduce the shape, and Rigidity can be improved.

According to the rotation adjusting mechanism for a vehicle seat according to the second aspect of the present invention, the concave portion for receiving the first rolling member is provided on the upper end of the engagement sliding portion of the lower base having a substantially inverted U-shaped cross section. And a convex portion for receiving the second rolling member are formed, and the concave portion and the convex portion form a substantially S-shaped receiving portion. Therefore, the height and width can be reduced to reduce the size. It is possible to reduce the deformation, reduce the thickness of the plate, reduce the weight and reduce the sliding resistance, and reduce the rotational operation force to easily and quickly perform the rotational adjustment.

According to the rotation adjusting mechanism for a vehicle seat according to the third aspect of the present invention, since the receiving portion for receiving the upper end of the first rolling member of the upper base has a linear portion, the linear portion is formed. The automatic alignment function can be provided in the shape, and the upper base can be stably held without rattling in the front, back, up, down, and rotation directions, and the thickness can be reduced with less deformation. Thus, the weight can be reduced, the sliding resistance can be reduced, and the rotational operation force can be reduced, and the rotational adjustment can be performed simply and quickly.

According to the present invention, the rotation adjusting mechanism including the lower base, the upper base, and the holder member can be simply configured with the minimum necessary number of parts, and can have an automatic centering function. The impact load can be transmitted more reliably from the holder member to the lower base, the deformation can be reduced, the plate thickness can be reduced, the weight can be reduced, the sliding resistance can be reduced, and the rotating operation force can be reduced. The rotation of the vehicle seat can be easily and quickly adjusted, the height and width can be reduced, the size can be reduced, the rigidity in the vertical direction can be improved, and the cost of the vehicle seat can be reduced. An adjustment mechanism can be obtained.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a rotation adjusting mechanism for a vehicle seat according to the present invention.

FIG. 2 is a plan view of a rotation adjusting mechanism for a vehicle seat according to the present invention.

FIG. 3 is a side view of a vehicle seat rotation adjusting mechanism according to the present invention.

FIG. 4 is a sectional view taken along line XX of FIG. 2 of the rotation adjusting mechanism for a vehicle seat according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Rotation adjustment mechanism 11 Lower base 12 Circular opening 13 Upper base 13a Recessed part 13b Flange part 13c Ball receiving part 15 Holder member 15a Horizontal part 15b Flange part 21 Engagement sliding part 23 First rolling member 25 Sliding part 25a Receiving part 27 Second rolling member 31 Bolt 32 Nut 34 Substantially S-shaped receiving part 35 Concave part 37 Convex part 41 Linear part

Claims (3)

[Claims] 1. An annular lower base fixed to the floor side of a passenger compartment, an annular upper base to which a seat body is fixed, and a holder member fixed to an outer peripheral edge of the upper base to clamp the lower base. In the rotation adjustment mechanism for a vehicle seat, the annular lower base is formed with an engagement sliding portion having a substantially inverted U-shaped cross section, and the upper base and the engagement sliding portion of the lower base are formed in a first position. A sliding portion having a substantially U-shaped cross section is provided on the holder member for engaging with an engaging sliding portion having a substantially inverted U-shaped cross section of the lower base; A second rolling member is provided between the sliding portion of the lower base and the engaging sliding portion of the lower base, and a line connecting the centers of the first rolling member and the second rolling member is oblique. The seat for the vehicle, characterized in that Adjustment mechanism. 2. A concave portion for receiving a first rolling member and a convex portion for receiving a second rolling member are formed at an upper end of the engagement sliding portion of the lower base having a substantially inverted U-shaped cross section. 2. The rotation adjusting mechanism for a vehicle seat according to claim 1, wherein a substantially S-shaped receiving portion is formed by the concave portion and the convex portion. 3. The rotation of a vehicle seat according to claim 1, wherein a linear portion is formed in a receiving portion for receiving an upper end of the first rolling member of the upper base. Adjustment mechanism.