JP4122444B2 - Vehicle seat device - Google Patents

Description

  The present invention relates to a vehicle seat device.

  For a seat (vehicle seat) provided in a vehicle, for example, as disclosed in Patent Document 1, a seat back is vertically divided into a seat back lower portion and a seat back upper portion, and the seat back according to a reclining angle of the seat back lower portion. Some have been designed so that a comfortable driving posture can be taken by moving the cushion back and forth.

In general, a seat cushion spring is disposed in the seat cushion of the vehicle seat device. However, if the front end of the seat cushion spring is attached to the seat cushion frame and the rear end is attached to the seat back frame, the relative position of the seat cushion frame and the seat back frame changes due to the movement of the seat cushion as described above. Sometimes, the distance between the front end mounting portion and the rear end mounting portion of the seat cushion spring also changes. For this reason, the length of the seat cushion spring is also changed, and the elastic force for the seated person is also changed, so that the seating property is lowered.
JP 2005-52433 A

  In view of the above fact, the present invention provides a vehicle seat device that can maintain the seat cushion spring length and maintain good seating ability for a seated person even when the relative position of the seat cushion frame and the seat back frame changes. It is a problem to obtain.

  According to the first aspect of the present invention, the seat cushion frame constituting the seat cushion of the vehicle seat and the seat back constituting the seat back of the vehicle seat and capable of reclining by rotating with respect to the seat cushion frame. A frame, a seat cushion spring disposed in the seat cushion, a first attachment member provided on the seat back frame to which a rear end of the seat cushion spring is attached, and the seat cushion spring provided on the seat cushion frame And a distance maintaining means for maintaining a distance between the first mounting member and the second mounting member.

  In the present invention, the rear end of the seat cushion spring is attached to a first attachment member provided on the seat back frame, and the front end is attached to a second attachment member provided on the seat cushion frame. Here, even if the seat back frame rotates with respect to the seat cushion frame and the relative positions thereof change, the interval between the first attachment member and the second attachment member is maintained by the interval maintaining means. For this reason, the length of the rear end and the front end of the seat cushion spring is also maintained. Since the elastic force with respect to the seated person does not change, the seating property can be maintained well.

  According to a second aspect of the present invention, in the first aspect of the invention, the rear end of the seat cushion spring is attached to the first attachment member at a position different from the rotational center of the seat back frame. It is characterized by.

  In this way, by attaching the rear end of the seat cushion spring to the first mounting member at a position different from the rotation center of the seat back frame, the degree of freedom of arrangement of the seat cushion spring and the degree of freedom of design of the seat back frame are increased. Increase.

  In this configuration, if the front end of the seat cushion spring is fixed to, for example, the seat cushion frame, the rear end of the seat cushion spring moves as the seat cushion spring rotates. The length of the front end will also change. However, in this invention, since the space | interval of a 1st attachment member and a 2nd attachment member is maintained by the space | interval maintenance means, the length of the rear end and front end of a seat cushion spring is also maintained.

  According to a third aspect of the present invention, in the second aspect of the invention, the distance maintaining means includes a connecting member that connects the first mounting member and the second mounting member.

  Thus, with a simple structure having a connecting member, the distance maintaining means can be configured to maintain the distance between the first mounting member and the second mounting member.

  According to a fourth aspect of the present invention, in the first aspect of the present invention, the seat back frame is fixed to the seat back frame downward about a pivot center point of the seat back frame. A curved plate that is curved with a curvature and presses the rear end portion of the seat cushion spring from above is provided.

  Accordingly, the rear end portion of the seat cushion spring is pushed by the curved plate and bent around the pivot center point of the seat back frame. Accordingly, the rear end portion of the seat cushion spring is smoothly connected to the seat back frame, so that the seating feeling of the seated person can be improved.

  According to a fifth aspect of the invention, in the fourth aspect of the invention, the front end of the contact portion between the curved plate and the seat cushion spring is positioned closer to the seat back frame than the front end of the curved plate. It is characterized by being.

  Therefore, the seat cushion spring is linear as a tangent to the contact portion with the curved plate at the front side of the contact portion with the curved plate (hereinafter referred to as “separation point”), and at the rear side with respect to the separation point. It curves with a predetermined curvature along the curved plate. At the separation point, the straight portion and the curved portion of the seat cushion spring are smoothly continuous without a step, so that the sitting feeling of the seated person can be improved.

  When the seat back frame is tilted forward, the seat cushion spring is pushed by the curved plate, and is bent in an arc shape centering on the rotation center of the seat back frame. Further, when the seat back frame is tilted backward, the curved plate is separated from the seat cushion spring, so that the seat cushion spring is linear. In either case, the step between the seat cushion spring and the seat back frame can be reduced.

  Since the present invention is configured as described above, even when the relative position of the seat cushion frame and the seat back frame changes, the seat cushion spring length can be maintained and the seating ability for the seated person can be maintained well.

  1 and 3 schematically show the internal structure of the vehicle seat device 102 according to the first embodiment of the present invention. 2 and 4 schematically show the external shape of the vehicle seat device 102. In the drawings, the front of the vehicle is indicated by an arrow FR, the vehicle width direction is indicated by an arrow W, and the upper side is indicated by an arrow UP. Some vehicle seat devices can be rotated around the center of rotation in the vertical direction, and the front of the vehicle and the front of the vehicle seat device may not coincide with each other due to the rotation. The seat device 102 will be described as being installed facing the front of the vehicle.

  As shown in FIGS. 2 and 4, the vehicle seat device 102 includes a seat cushion 104 and a seat back 106, and the seat back 106 reclines with respect to the seat cushion 104 as will be described in detail later. It is. 3 and 4 show a state in which the reclining angle is increased by tilting (backward tilting) the seat back 106 from the state of FIGS. 1 and 2.

  A seat cushion frame 108 is provided in the seat cushion 104 and a seat back frame 110 is provided in the seat back 106 so that the shape can be maintained.

  The seat cushion frame 108 has a pair of seat cushion side frames 112 arranged in parallel with a certain interval in the vehicle width direction. In contrast, the seat back frame 110 is formed in a substantially inverted U shape, and the seat back top frame 114 disposed substantially horizontally at the upper end and the seat cushion frame 108 from both ends of the seat back top frame 114. A pair of parallel seat back side frames 116 extending toward the rear. The seat back side frame 116 is curved at a predetermined position in accordance with the shape of the upper body of the seated person.

  Further, an arc portion 118 is formed in the lower portion of the seat back frame 110. The arc portion 118 is formed in an arc shape centered on an assumed rotation center point DP1 assumed in advance for the vehicle seat device 102. Hereinafter, the assumed rotation center point DP1 will be described.

  As shown in detail in FIG. 8, when the seat back 106 is tilted backward by reclining, the center point of rotation of the upper body of the seated person SP is considered. At this time, the rotation center point is at a different position depending on the body shape and posture of the seated person. Here, in this embodiment, the assumed rotation center point DP1 is set by taking an average of a plurality of seated persons. Therefore, the assumed rotation center point DP1 can include the average of the hip point of the seated person and the position of the sciatic tubercle. In particular, in this embodiment, the average position of the seated person's hip points is assumed to be the assumed rotation center point DP1. As shown in FIGS. 5 to 7, the arc portion 118 is formed to have an arc shape with the assumed rotation center point DP <b> 1 set in this way as a center.

  As shown in detail in FIGS. 1, 3 and 7, arc-shaped long holes 120 centering on the assumed rotation center point DP1 are formed in the rear portions of the seat cushion frames 108, respectively. On the other hand, each of the seat back frames 110 is provided with two pins 122 that are accommodated in the elongated holes 120 at a predetermined interval. Therefore, when the pin 122 relatively moves (slids) in the long hole 120, the arc portion 118 rotates around the assumed rotation center point DP1. As the arc portion 118 rotates, the seat back frame 110 also moves between the normal posture shown in FIGS. 1 and 5 and the reclining posture shown in FIGS. 3 and 6. The position of the pin 122 is determined in relation to the long hole 120 so that the seat cushion frame 108 can move between the normal position and the reclining position.

  A seat back frame side gear 124 having external teeth formed around the assumed rotation center point DP1 is attached to each of the arc portions 118 of the seat cushion frame 108. In addition, a seat cushion frame side gear 126 is rotatably attached to each of the seat cushion side frames 112, and teeth thereof mesh with external teeth of the seat back frame side gear 124. Each of the seat cushion frame side gears 126 is connected by a driving force transmission rod 128 extending in the vehicle width direction so as to rotate integrally.

  Further, as shown in FIGS. 1 and 3, a motor 130 for rotating the seat back frame side gear 124 is attached to one of the seat cushion side frames 112. Therefore, when the motor 130 is rotated, the two seat cushion frame side gears 126 are integrally rotated, and the seat back frame side gear 124 meshed with the seat cushion frame side gear 126 is also rotated around the assumed rotation center point DP1. To do. Thereby, the circular arc part 118 can be rotated around the assumption rotation center point DP1 using the rotational driving force of the motor 130.

  As shown in FIGS. 5 to 7, a projecting portion 132 projects downward from the arc portion 118 of the seat back frame 110, and a boundary portion between the arc portion 118 and the projecting portion 132 (lower pin) 122 in the vicinity of the rear holding pipe 134. As shown in FIGS. 1 and 3, the rear holding pipe 134 is disposed in the seat cushion 104 and elastically supports the cushion pad 148 (see FIGS. 2 and 4) of the seat cushion 104 from the inside. The rear end of the seat cushion spring 140 is attached. Thus, since the rear holding pipe 134 is provided and the rear end of the seat cushion spring 140 is attached, for example, a shaft serving as a rotation center when the seat back 106 is reclined is provided on the seat back frame 110 (shaft The position of the seat cushion spring 140 is higher than the configuration in which the rear end of the seat cushion spring 140 is attached to the shaft.

  On the other hand, pipe sliding slits 138 are formed in the vicinity of the front ends of the seat cushion side frames 112 along the front-rear direction, and the ends of the front holding pipe 136 are respectively connected to the two pipe sliding slits 138. Contained. The front holding pipe 136 is slidable in the pipe sliding slit 138 and is movable in the front-rear direction. A front end of a seat cushion spring 140 is attached to the front holding pipe 136.

  The vicinity of the protruding end of the protruding portion 132 and the front holding pipe 136 are connected by a link 144 so that the distance between them is always maintained constant. Therefore, the rear holding pipe 134 and the front holding pipe 136 are connected by the protrusion 132 and the link 144 so that the distance between them is constant. For example, when the inclination angle of the seat cushion frame 108 changes due to forward or backward inclination, the position of the rear holding pipe 134 also changes, and the front holding pipe 136 also slides back and forth in response to this, and the rear holding The distance between the pipe 134 and the front holding pipe 136 is always kept constant.

  As shown in FIGS. 5 and 6, a seat cushion spring pressing plate 146 is attached to the arc portion 118 of each seat cushion frame 108. The seat cushion spring pressing plate 146 has a pressing piece 146P formed in an arc shape centered on the assumed rotation center point DP1. As shown in FIG. 5, the position of the pressing piece 146P is such that the boundary point (hereinafter referred to as the separation point PP) between the contact portion of the seat cushion spring 140 and the pressing piece 146P and the separation portion is referred to as the seat from the front end of the pressing piece 146P. The back frame 110 is located behind the front end of the pressing piece 146P.

  In the normal state of the seat back frame 110, the separation point PP moves relatively forward and presses the rear part of the seat cushion spring 140 to be bent in an arc shape. On the other hand, as shown in FIG. 6, in the rearward tilt state of the seat back frame 110, the separation point PP moves relatively rearward, and the front portion of the pressing piece 146P is gradually separated from the seat cushion spring 140. It is set to go. The seat cushion spring 140 is linear as a tangent to the contact portion with the pressing piece 146P on the front side of the separation point PP between the pressing piece 146P and the seat cushion spring 140, and the rear side is a circle around the assumed rotation center point DP1. Curved in an arc. In the seat cushion spring 140, a portion that is linear on the front side of the separation point PP and a portion that is curved in an arc shape on the rear side of the separation point PP are smooth at the separation point PP, that is, abruptly. It will be continuous without bending.

  As shown in FIGS. 2 and 4, a cushion pad 148 and a back pad 150 are attached and fixed to the seat cushion frame 108 and the seat back frame 110, respectively. Further, an intermediate pad 152 is disposed between the cushion pad 148 and the back pad 150 and is fixed to the cushion pad 148. The intermediate pad 152 is formed so as to be extendable and contracted, and when the distance between the cushion pad 148 and the back pad 150 changes, the change is absorbed and a gap does not occur between the cushion pad 148 and the back pad 150. It has become.

  In the vehicle seat device 102 of the present embodiment configured as described above, when driving an automobile, as shown in FIGS. 1, 2, and 5, the seat back 106 (seat back frame 110) is provided. It becomes a normal state with a small inclination angle. When the motor 130 is rotationally driven from this state, the seat cushion frame side gear 126 rotates as shown in FIGS. 3, 4 and 6, and the seat back frame side gear 124 engaged therewith also rotates. The portion 118 rotates about the assumed rotation center point DP1, and the seat back frame 110 also tilts backward. That is, by rotating the motor 130, the inclination angle of the seat back 106 can be increased and the reclining state can be achieved.

  At this time, as can be seen from the above description, in the present embodiment, the seatback 106 tilts backward while rotating about the assumed rotation center point DP1. That is, the seat back 106 tilts backward with reference to the pivot center of the behavior of the upper body of the seated person when taking the reclining posture, in other words, the pivot center when the upper body of the seated person tilts backward. Therefore, the seat back 106 follows the movement of the upper body of the seated person at the time of reclining. Therefore, the displacement of the relative position between the seat occupant and the seat back 106 due to an increase in the inclination angle of the seat back 106 is reduced. For example, a so-called fold occurs between the seat occupant's back and the seat back 106, The clothes will not be accidentally pulled by friction with the seat back 106. The seated person can take a comfortable sitting posture even when the inclination angle of the seat back 106 increases.

  In addition, since the back pad 150 does not need to be considered to be misaligned with the upper body of the seated person, the back pad 150 can have a shape more suitable for the upper body of the seated person, and improve the fit and support feeling for the seated person. Can do.

  When the inclination angle of the seat back 106 changes, the position of the rear holding pipe 134 also changes. Here, in this embodiment, as shown in FIGS. 5 and 6, the vicinity of the protruding end of the protruding portion 132 and the front holding pipe 136 are connected by the link 144, so the front holding pipe 136 is also moved forward and backward. By sliding, the distance between the rear holding pipe 134 and the front holding pipe 136 is always kept constant. Therefore, the length of the seat cushion spring 140 attached to each of the rear holding pipe 134 and the front holding pipe 136 can be maintained constant. Thus, the elastic force of the seat cushion spring 140, that is, the tension that the seat cushion spring 140 acts on the cushion pad 148 is also maintained constant.

  Further, in this embodiment, as can be seen from FIGS. 5 and 6, when the seat back 106 is in the normal state or forward tilted, the pressing piece 146 </ b> P of the seat cushion spring pressing plate 146 presses the rear portion of the seat cushion spring 140. It is bent in an arc. As the seat back frame 110 tilts backward, the front end (separation point PP) of the contact portion of the seat cushion spring 144 with the pressing piece 146P relatively gradually moves backward. The front portion of the pressing piece 146P is separated from the seat cushion spring 140. For this reason, the seat cushion spring 140 smoothly continues to the arc portion 118 at the separation point PP without being bent sharply. Thereby, in this embodiment, since the seat cushion spring 140 is continued both when the seat back 106 is tilted forward and backward, the cushion pad 148 can be maintained in a desired shape.

  In the above description, the structure having the link 144 is given as the interval maintaining means of the present invention. However, if the interval between the rear holding pipe 134 and the front holding pipe 136 can be maintained, the configuration of the interval maintaining means is the same. It is not limited. For example, moving means (such as a motor) for moving the front holding pipe 136 in the vehicle front-rear direction is provided, and the position of the rear holding pipe 134 is detected by a sensor or the like to move the front holding pipe 136 in the front-rear direction. Thus, a configuration may be used in which the distance between the rear holding pipe 134 and the front holding pipe 136 is maintained. When the link 144 is used as in the above embodiment, the interval can be reliably maintained with a simple configuration.

  Further, the application target of the present invention is not limited to the one in which the first attachment member (the member to which the rear end of the seat cushion spring 140 is attached) is the rear holding pipe 136 as described above. In short, the first mounting member and the second mounting can be applied when the first mounting member moves with a change in the relative position of the seat back and the seat cushion (the reclining of the seat back is one example). The distance from the member (the member to which the front end of the seat cushion spring 140 is attached) can be maintained.

It is a schematic perspective view which shows the internal structure of the vehicle seat apparatus of 1st embodiment of this invention in a normal state. It is a schematic perspective view which shows the external appearance shape of the vehicle seat apparatus of 1st embodiment of this invention in a normal state. It is a schematic perspective view which shows the internal structure of the vehicle seat apparatus of 1st embodiment of this invention in a reclining state. It is a schematic perspective view which shows the external appearance shape of the vehicle seat apparatus of 1st embodiment of this invention in a reclining state. It is a partially broken side view which shows the internal structure of the vehicle seat apparatus of 1st embodiment of this invention in a normal state. It is a partially broken side view which shows the internal structure of the vehicle seat apparatus of 1st embodiment of this invention in a reclining state. It is a partially broken side view which expands and shows the vehicle seat apparatus of 1st embodiment of this invention in the vicinity of a circular arc part. It is explanatory drawing which shows the relationship between a seat back and its rotation center in the vehicle seat apparatus of 1st embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 102 Vehicle seat apparatus 104 Seat cushion 106 Seat back 108 Seat cushion frame 110 Seat back frame 112 Seat cushion side frame 114 Seat back top frame 116 Seat back side frame 118 Arc part 120 Long hole 122 Pin 124 Seat back frame side gear 126 Seat Cushion frame side gear 128 Driving force transmission rod 130 Motor 132 Protruding portion 134 Rear holding pipe (first mounting member)
136 Front holding pipe (second mounting member)
138 Pipe sliding slit 140 Seat cushion spring 144 Link (connecting member, spacing maintaining means)
146 Seat cushion spring pressing plate (curved plate)
146P Pressing piece 148 Cushion pad 150 Back pad 152 Intermediate pad

Claims (5)

A seat cushion frame constituting a seat cushion of a vehicle seat;
A seat back frame which constitutes a seat back of a vehicle seat and which can be reclined by rotating with respect to a seat cushion frame;
A seat cushion spring disposed in the seat cushion;
A first attachment member provided on the seat back frame to which a rear end of the seat cushion spring is attached;
A second attachment member provided on the seat cushion frame and to which a front end of the seat cushion spring is attached;
An interval maintaining means for maintaining an interval between the first attachment member and the second attachment member;
A vehicle seat device comprising:   2. The vehicle seat device according to claim 1, wherein a rear end of the seat cushion spring is attached to the first attachment member at a position different from a rotation center of the seat back frame.   The vehicle seat device according to claim 1, wherein the distance maintaining unit includes a connecting member that connects the first mounting member and the second mounting member. A curved plate that curves downward with a certain curvature around the pivot point of the seat back frame to the seat back frame and presses the rear end portion of the seat cushion spring from above;
The vehicle seat device according to any one of claims 1 to 3, wherein the vehicle seat device is provided.   The vehicle seat device according to claim 4, wherein a front end portion of a contact portion between the curved plate and the seat cushion spring is located closer to a seat back frame than a front end of the curved plate.

Images