JP2015081061A - Driving posture adjusting device for vehicle seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a driving posture adjusting device capable of adjusting a seat at various positions while securing both of a vertical movement amount and an inclination amount of the seat.SOLUTION: A seat (10) including a seat frame (13) is disposed on a base body (90, 91). The seat frame (13) is connected to the base body via front and rear link members (20, 21). Both of the link members (20, 21) are rotatably connected to both of the seat frame 13 and the base body. In addition, the rear link member (21) is movable relative to the seat frame (13) by cam mechanisms (25A, 25B) at connecting positions. The front and rear link members (20, 21) are connected via an expandable link member (30). The expandable link member (30) can be expanded or contracted with an intermediate shaft (33) outwardly advancing or retracting to or from respective front and rear support bodies (31, 32). The expansion and contraction of the expandable link member (30) cause the link members (20, 21) to move to allow the posture of the seat (10) to be adjusted.

Description

  The present invention relates to a device for adjusting the posture of a vehicle seat, and more particularly to a device for adjusting the height and angle of a seating surface of a seat.

  Many seats provided on vehicles such as automobiles can adjust the height and inclination (seat angle) of the seat according to the height and preference of the person sitting. Conventionally, a four-bar linkage mechanism has been used as a mechanism that enables such lifting and tilting. A four-bar link can be constructed by connecting the floor where the seat is installed and the seat frame vertically with two link members (assuming the floor is a fixed link). You can move the seat frame. One set of link members is usually provided on the left and right, and the corresponding link members are connected to each other by a connecting rod.

  In addition, there exist some which are disclosed by the following patent document 1 in the technique which belongs to this field | area, for example.

JP 2011-063049 A

  If the seat is raised simultaneously at the front and rear, the whole will rise. Therefore, in order to increase the lifting amount of the entire seat, it is necessary to design the link mechanism so that the rear link rises when the front link rises. However, the angle of the seat does not change much at this time. Therefore, this time, when trying to secure a large amount of seat tilt, the rear link must fall down when the front link rises, but the height of the entire seat does not change so much. As described above, in the conventional apparatus, the amount of lifting and tilting is in a trade-off relationship with each other, and it is difficult to secure both amounts at the same time.

  The present invention has been made in view of such problems, and the problem to be solved by the present invention is to secure both the lift and tilt of the seat so that the seat can be adjusted to various postures. There is to do.

  In order to solve the above problems, the present invention takes the following means. In a vehicle seat posture adjustment mechanism obtained from one aspect of the present invention, a seat including a seat frame is disposed on a base body, and the seat frame is connected to the base body by a front link member and a rear link member. Yes. Both the front link member and the rear link member are rotatably coupled to both the seat frame and the base body, and either the front link member or the rear link member is further coupled to one of the seat frame and the base body. Relative displacement is possible at each location. The front link member and the rear link member are connected by an expansion / contraction link member, and the expansion / contraction link member includes a front support, a rear support, and an intermediate shaft, and the intermediate shaft is connected to the front support and the rear support. The whole can be expanded and contracted by advancing and retracting outward from each of the. The intermediate shaft is passed through a holding sleeve. The holding sleeve is rotatably supported by the base body, the front support is connected to the front link member, and the rear support is connected to the rear link member. By moving at least one of the front link member and the rear link member by expanding and contracting the telescopic link member, the seat frame can be moved to adjust the posture of the seat relative to the base body.

  As a preferred embodiment, the seat frame is provided with a cam surface so that the end portion of the rear link member can move along the cam surface. The cam surface can be constituted by an edge of a long hole provided in the seat frame, for example.

  As a preferred embodiment, the front support body and the rear support body each include a front rotation motor and a rear rotation motor, the stator of the front rotation motor is rotatably connected to the front link, and the stator of the rear rotation motor is It is rotatably connected to the side link. Nuts are provided on the rotors of the front and rear rotary motors, and the intermediate shaft has a front screw portion and a rear screw portion, and each screw meshes with each nut. When the rotor of at least one of the first rotary motor and the second rotary motor rotates, the intermediate shaft moves forward and backward from the rotary motor. In this way, if the shaft is driven by the engagement between the nut and the threaded portion, the nut will not rotate and the seat will not move up and down or tilt even if a force to advance or retract the intermediate shaft from the front and rear link members is applied. Can hold.

It is a side view of the raising / lowering / tilting apparatus of the sheet | seat in the Example of this invention. It is a top view which shows typically the raising / lowering / tilting apparatus of the sheet | seat in the Example of this invention. It is sectional drawing of the mechanism provided with the shaft and motor which are used for the apparatus of FIG. 1 in the Example of this invention.

EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated, referring drawings.
FIG. 1 shows an example of a vehicle seat 10. The seat 10 is installed on a vehicle such as an automobile for a passenger to sit on, and includes at least a seat cushion 11, but also includes a seat back 12 that is usually backrest. The sheet 10 is disposed on the base body. For example, when the seat is installed in an automobile, the base body includes a floor 90 of the passenger compartment.

  As shown in FIG. 1, the seat 10 includes a seat frame 13 serving as a skeleton. The seat frame 13 is connected to the base body using the front link member 20 and the rear link member 21. The front and rear link members 20 and 21 are rotatably coupled to both the seat frame 13 and the base body so as to form a two-dimensional link mechanism that operates in a plane orthogonal to the seat width direction. . As an example, as shown in FIG. 1, hinge brackets 22A, 23A, and 24A are fixed to the seat frame 13 and the floor 90 as components of the base body, and the link members 20 and 21 are connected to the hinge brackets 22A, 23A, and 24A. It may be fixed to the seat frame 13 or the floor 90. For example, a plate material is bent in a U-shape to form parallel surfaces, and bearing holes are formed in the parallel surfaces to constitute hinge brackets 22A, 23A, 24A, and bearing holes are also formed in the end portions of the link members 20, 21; By linking the hinge shafts 22B, 23B, and 24B through the hinge brackets 22A, 23A, and 24A and the bearing holes of the link members 20 and 21, the link members 20 and 21 can be rotatably coupled.

  As shown in FIG. 2, the front and rear link members 20 and 21 may be provided as a pair on the left and right sides of the seat, and the operations may be synchronized by connecting them with connecting rods 20a and 21a, respectively. In this case, as shown in FIG. 2, the hinge shafts 22B, 23B, and 24B can be long ones extending from the left and right brackets 22A, 23A, and 24A.

  As shown in FIG. 1, either the front side link member 20 or the rear side link member 21 is further provided so as to be displaceable at one of the seat frame 13 and the base body at the coupling point. As a preferred embodiment, the rear link member 21 is preferably displaceable with respect to the seat frame 13 at the connecting portion, and the remaining connecting portions are preferably held in a mechanism that allows only rotation. In the present invention, although the four link elements of the base body, the seat frame 13, and the front and rear link members 20 and 21 are used in this way, all the four joint portions formed by these elements are not simply rotationally coupled. This is different from conventional seat lifting / tilting devices. As shown in FIG. 1, any two members of the base body, the front and rear link members 20 and 21, and the seat frame 13 are connected by an elastic link member 30 that can change the overall length. The telescopic link member 30 is rotatably coupled to the front link member 20 at the front end, and is rotatably coupled to the rear link member 21 at the rear end. By expanding and contracting the telescopic link member 30, the link mechanism is operated, and the posture of the seat relative to the base body can be adjusted. As a preferred embodiment, the front and rear link members 20 and 21 are preferably connected by a telescopic link member 30 as shown in FIG.

  As shown in FIG. 1, the rings 30 a and 30 b may be attached to the ends of the telescopic link member 30 and may be rotated by passing through connecting rods that connect the corresponding link members on the left and right. With this form of coupling, the telescopic link member 30 can be placed at the center of the left and right link members, so that it is possible to operate left and right evenly and to suppress the occurrence of abnormal noise due to distortion. it can.

  The means for enabling relative displacement of the coupling portion is not limited to a specific one, but it is preferable to use a cam mechanism. As one embodiment, as shown in FIG. 1, a generally downward cam surface 13a is provided on the seat frame 13 so that the upper portion of the rear link member 21 can slide along the cam surface 13a while being in contact with the cam surface 13a. To do. The cam surface 13a may be simply constituted by a part of the lower edge of the seat frame 13. For example, as shown in FIG. 1, the cam bracket 25A fixed to the seat frame 13 is provided with a long hole 25a. The upper edge of 25a can also be used as the cam surface 13a. The cam bracket 25A can be formed in the same manner as the hinge bracket 24A. On the other hand, the rear link member 21 is provided with a pin 25B penetrating through the upper portion, and the rear link member 21 can be rotated and displaced relative to the seat frame 13 by passing the pin 25B through the long hole 25a. become.

  If the seat frame 13 or at least one of the front and rear link members 20 and 21 is moved to change the seat posture, the contact point with the cam surface 13a of the rear link member 21 moves. Once the seat posture is determined, the seat frame 13 is supported by the rear link member 21 at one place on the cam surface 13a. Thus, the posture that the seat can take is not only the length of the front and rear link members 20 and 21 (between the coupling portions) and the coupling position to the floor 90 and the seat frame 13, but also the shape of the cam surface 13a (example in FIG. 1). As a straight line). Even if it is desired to change the movement pattern of the sheet, it is only necessary to redesign the shape of the cam surface 13a. Therefore, the same link member is reused for various specifications of the sheet without changing the lengths and connecting positions of the link members 20 and 21. be able to.

  The telescopic link member 30 includes a front support 31, a rear support 32, and an intermediate shaft 33. The intermediate shaft 33 advances and retreats outward from each of the front support 31 and the rear support 32. Make it stretchable. For example, if each of the front and rear supports 31 and 32 is a cylindrical member, the telescopic link member 30 expands and contracts as a whole by feeding the intermediate shaft 33 out of the cylinder or drawing it into the cylinder. The front support 31 is rotatably coupled to the front link member 20 by a ring 30a fixed to the front surface, and the rear support 32 is rotatably coupled to the rear link member 21 by a ring 30b fixed to the rear surface.

  In order to limit the freedom of movement of the elastic link member 30 itself (excluding expansion and contraction), the intermediate shaft 33 is passed through the holding sleeve 34, and the holding sleeve 34 is rotatably supported by the base body. As one embodiment, as shown in FIG. 1, two support arms 91 sharing a ring 91a at the tip as a constituent element of the base body are extended upward from the hinge shafts 22B and 23B on the floor 90 and held. The holding sleeve 34 can be rotated by passing the protrusions 34a protruding left and right from the side surface of the sleeve 34 through the ring 91a. If comprised in this way, the expansion-contraction link member 30 will be expanded-contracted by advancing / retreating the intermediate shaft 33 with respect to at least any one of the support bodies 31 and 32 before and behind, and at least of the front side link member 20 and the rear side link member 21 will be carried out. One can be rotated.

  The means for enabling the shaft 33 of the telescopic link member 30 to advance and retract is not limited to a specific one, but a mechanism that converts rotation into linear motion can be used. The preferred embodiment uses a mechanism with nuts and screws, such as those used in mechanical jacks. Specifically, nuts 51 and 52 are provided on one side of each of the front and rear support bodies 31 and 32, and the screw portions provided on both ends of the intermediate shaft 33 are engaged with the nuts 51 and 52 of the support bodies 31 and 32, respectively. By rotating the nuts 51 and 52 by some means, the shaft 33 can be moved back and forth with respect to the support bodies 31 and 32. However, it is necessary to provide means for preventing the shaft from rotating due to friction with the nuts 51 and 52. When such a mechanism is used, the nuts 51 and 52 do not rotate even when a force for moving the intermediate shaft 33 back and forth is applied from the front and rear link members 20 and 21, so that the seat does not automatically move up and down or tilt. Can hold.

  As shown in FIG. 3, the nuts 51 and 52 may be electrically driven by using the rotary motors 40 incorporating the nuts 51 and 52 as the front and rear supports 31 and 32, respectively. Since the two motors 40 can use the same thing, in FIG. 3, the code | symbol is attached | subjected so that it can be read as either motor. As an example, a motor 40 having a rotor 42 inside a cylindrical stator 41 (housing) is used. The stator 41 is provided with a permanent magnet 41a, and the rotor 42 is provided with a coil 42a. The rotor 42 is supported by the stator 41 so as to be rotatable by bearings at both ends as appropriate. Here, nuts 51 and 52 (internal thread portions) are provided on one side of the rotor 42 so that the nuts 51 and 52 can rotate when the rotor 42 rotates. The stator 41 of the front rotary motor 40 is rotatably coupled to the front link member 20, and the stator 41 of the rear rotary motor 40 is rotatably coupled to the rear link member 21. Then, screw portions are provided at both front and rear ends of the intermediate shaft 33, and these screw portions are engaged with the nuts 51 and 52 of the front and rear motors 40, respectively. By providing the rotor shaft and the nuts 51 and 52 in alignment, the nuts 51 and 52 can be rotated and the intermediate shaft 33 can be advanced and retracted when the motor 40 is operated. Here, in a portion where the shaft penetrates the housing (stator 41), the shaft 33 itself rotates due to friction with the nuts 51 and 52 by making the cross section of the shaft and the shape of the hole 41b of the housing non-circular. Can not be. Even when the motor 40 is electrically driven in this way, the nuts 51 and 52 do not rotate even when a force for moving the intermediate shaft 33 back and forth is applied from the front and rear link members 20 and 21 regardless of whether the motor 40 is operating. The sheet can be held so as not to move up and down or tilt.

  As shown in FIG. 3, nuts 51 and 52 (female screw portions) can be provided by forming a cylindrical shape having a passage through the inner rotor 42 and forming a screw on the inner surface. Since the rotor 42 is hollow, the intermediate shaft 33 can enter the passage inside the rotor 42 all the way. As the rotor 42 becomes longer, the movable range of the shaft 33 can be increased.

  The two front and rear rotary motors 40 can be controlled variously independently to advance and retract the intermediate shaft 33. For example, in some cases, only one motor 40 may be operated. However, the two motors 40 may be dependently controlled to synchronize. The two sets of front and rear nuts 51 and 52 and the winding direction of the screw portion and the feed rate may be the same or may be changed. In particular, if the winding direction is reversed, the telescopic link member 30 can be efficiently expanded and contracted in the manner of a turnbuckle used for tension adjustment and the like. Even if the winding direction is the same for the two front and rear nuts 51 and 52 and the threaded portion, it is possible to realize subtle seat posture adjustment by setting each feed rate to various values within the range in which the mechanism functions. I can do it. If the winding direction is the same and the feed rate is the same, the entire telescopic link member 30 does not expand or contract even when the nuts 51 and 52 rotate, but it can be seen from the front and rear supports 31 and 32 held by the support arm 91. For example, the intermediate shaft 33 “expands”. Therefore, an embodiment that performs such a special operation can be considered as being included in the present invention.

  Instead of using the rotary motor 40, an operation lever or an operation dial may be attached to the nuts 51 and 52 via a known clutch so that the nut can be manually rotated. The clutch has a mechanism that transmits the force from the lever to the nut but does not transmit the force in the reverse direction. Therefore, the nut does not rotate even when a force for moving the intermediate shaft 33 back and forth from the front and rear link members 20 and 21 is applied, so that the seat does not move up and down or tilt.

  As shown in FIG. 1, a slide mechanism 80 may be provided on the seat frame 13 or the base body so that the position of the seat can be adjusted back and forth. For example, the slide mechanism can be configured such that the upper rail 82 can slide on the fixed lower rail 81. It is preferable to provide the slide mechanism 80 on the seat frame 13 instead of the base body because it is not necessary to move the link members 20, 21, 30 and the motor 40 together with the seat 10 and energy is not wasted. Further, it is preferable to dispose the slide mechanism near the seat because a moment that causes the upper rail 82 to float from the lower rail 81 when a seat occupant or a force in the front-rear direction due to inertial force acts on the seat back can be suppressed.

  In addition, this invention is not limited to the Example shown to the said and drawing, It can implement with other various forms.

10 seat 11 seat cushion 12 seat back 13a cam surface 13 seat frame 20 front link member 21 rear link members 20a, 21a connecting rods 22A, 23A, 24A hinge brackets 22B, 23B, 24B hinge shaft 25A cam bracket 25B pin 25a long Hole 30 Telescopic link member 31 Front support body 32 Rear support body 33 Intermediate shaft 34 Holding sleeve 40 Rotating motor 41 Stator 42 Rotors 51 and 52 Nut 80 Slide mechanism 81 Lower rail 82 Upper rail 90 Floor 91 Support arm

Claims (2)

An attitude adjustment mechanism for a vehicle seat,
A seat including a seat frame is disposed on the base body, and the seat frame is connected to the base body by a front link member and a rear link member,
Both the front link member and the rear link member are rotatably coupled to both the seat frame and the base body, and either the front link member or the rear link member is further coupled to one of the seat frame and the base body. It can be displaced relative to each other,
The front link member and the rear link member are connected by the expansion / contraction link member, and the expansion / contraction link member includes a front support, a rear support, and an intermediate shaft. The intermediate shaft is separated from each of the front support and the rear support. The elastic link member can be expanded and contracted by moving it forward and backward,
The intermediate shaft is passed through the holding sleeve, the holding sleeve is rotatably supported by the base body, the front support is connected to the front link member, and the rear support is connected to the rear link member,
An attitude adjustment mechanism configured to adjust the attitude of the seat relative to the base body by moving the seat frame by moving at least one of the front link member and the rear link member by expanding and contracting the telescopic link member. The posture adjustment mechanism according to claim 1,
The front support body and the rear support body each have a front rotation motor and a rear rotation motor, the stator of the front rotation motor is rotatably connected to the front link, and the stator of the rear rotation motor rotates to the rear link Are linked together,
Nuts are provided on the rotors of the front and rear rotary motors, and the intermediate shaft has a front screw portion and a rear screw portion, and each screw meshes with each nut,
A posture adjusting mechanism in which at least one of the rotors of the first rotary motor and the second rotary motor rotates so that the intermediate shaft advances and retreats outward from the rotary motor.

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