Seat

Abstract

A seat is provided with a side frame that constitutes a part of a seat cushion frame and is rotatably connected to a base member on one end side in the extension direction, and a posture conversion mechanism that has a first link, a second link, and a sector gear that is rotatably connected to the base member on the other end side in the extension direction. The first link and the second link connect the other end side of the side frame in the extension direction to the base member, and the lower end side of the first link in the lengthwise direction is rotatably connected to the base member. The lower end side of the second link in the lengthwise direction is rotatably connected to the upper end side of the first link in the lengthwise direction, and the upper end side of the second link in the lengthwise direction is rotatably connected to the side frame. The connecting part of the first connecting rod and the second connecting rod is located between the sector gear and the side frame.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a seat capable of causing one end side of a seat cushion in a front-rear direction to be displaced upward and downward. BACKGROUND

[0002] For example, a seat for a vehicle described in Chinese Patent No. CN216268818U is provided with a posture conversion mechanism capable of causing a front end side of a seat cushion to be displaced upward and downward. SUMMARY

[0003] The posture conversion mechanism described in Chinese Patent No. CN216268818U is provided directly below the seat cushion. Therefore, the posture conversion mechanism can possibly interfere with a part of the seat cushion (for example, an under surface of a cushion). In view of this problem point, the present disclosure discloses one example of a seat.

[0004] The seat capable of causing one end side of a seat cushion in a front-rear direction to be displaced upward and downward is preferably provided with, for example, at least one of the following configuration requirements.

[0005] That is, the configuration requirement includes: a side frame extending along an extension direction and constituting a part of a cushion frame, and having a linking portion directly or indirectly linking one end side of the side frame in the extension direction to a base member in a rotatable manner, wherein the extension direction is along a front-rear direction of the seat; and a posture conversion mechanism having a first link and a second link for linking the other end side of the side frame in the extension direction to the base member, and a sector gear that receives a driving force to rotate, and that causes the angle formed between the first link and the second link to change by the sector gear rotation, thereby causing one end side of the seat cushion in the front-rear direction to be displaced upward and downward.

[0006] Furthermore, it is preferable that the lower end side of the first link in the longitudinal direction is linked to the base member in a rotatable manner, the lower end side of the second link in the longitudinal direction is linked to the upper end side of the first link in the longitudinal direction in a rotatable manner, the upper end side of the second link in the longitudinal direction is linked to the side frame in a rotatable manner, and it is preferable that, in the seat width direction of the seat, the linking portions of the first link and the second link are located between the sector gear and the side frame.

[0007] Thus, in the seat, the linking position of the first link and the second link is located, for example, at a position offset toward the outside in the seat width direction with respect to the cushion of the seat cushion. Thus, it is possible to suppress the case where the posture conversion mechanism interferes with a part of the seat cushion. Further, since it is not necessary to provide a cover or the like for covering the upper side of the posture conversion mechanism, it is possible to suppress an increase in the manufacturing cost of the seat.

[0008] In addition, the seat can have, for example, the following configuration.

[0009] It is preferable that, in the seat width direction, the second link be located between the first link and the side frame.

[0010] Further, it is preferable that the rotation center of the sector gear and the rotation centers of both of the linking positions between the second link and the side frame (hereinafter referred to simply as "linking rotation centers" in the present specification) be located on the same axis, and that the rotation center and the linking rotation centers be separated from each other in the axis direction by a distance, and further, that the seat have a transmission portion that transmits the rotation of the sector gear to the second link.

[0011] Further, when the linking center of the base member and the side frame in the linking portion is taken as a first center, the linking center of the second link and the side frame is taken as a second center, and a virtual line that passes through the first center and the second center and extends in the front-rear direction of the seat is taken as a center line, and the linking center that links the first link and the second link is taken as a movement center, it is preferable that the movement center be located at a position that is located rearward of the second center, and further, it is preferable that the movement center be located at the same height as the center line or at a position higher than the center line at least when the seat cushion is in the regular posture in which one end side in the front-rear direction of the seat cushion has been lowered. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 is a view that shows the seat cushion frame of the first embodiment.

[0013] Figure 2 is a view that shows the seat cushion frame of the first embodiment.

[0014] Figure 3 is a view that shows the seat cushion frame of the first embodiment.

[0015] Figure 4 is a view that shows the drive side conversion mechanism of the first embodiment.

[0016] Figure 5 is a view that shows the drive side conversion mechanism of the first embodiment.

[0017] Figure 6 is a view that shows the drive side conversion mechanism of the first embodiment.

[0018] Figure 7 is a view showing a drive side conversion mechanism of the first embodiment.

[0019] Figure 8 is a view showing a driven side conversion mechanism of the first embodiment.

[0020] Figure 9 is a view showing a drive side conversion mechanism of the first embodiment.

[0021] Figure 10 is a view showing a position relationship of a cushion and a connecting site.

[0022] Figure 11 is a view showing a drive side conversion mechanism of the second embodiment. DETAILED DESCRIPTION

[0023] An exemplary embodiment of the present disclosure will be described below with reference to the accompanying drawings.

[0024] The following embodiment of the present invention shows one example of an embodiment within the technical scope to which the present disclosure pertains. That is, the technical solutions recited in the claims and the like are not limited to the specific structures or configurations and the like shown in the following embodiment.

[0025] The present embodiment is an example of a seat for a vehicle or the like (hereinafter referred to as a vehicle seat) installed in a vehicle or the like. The arrows and the like indicating directions and the like marked in each drawing are symbols marked for the purpose of facilitating understanding of the mutual relationships of the drawings and the shapes of the components or sites and the like.

[0026] The vehicle seat is not limited to the direction shown in each drawing. The direction shown in each drawing is the direction in a state where the vehicle seat of the present embodiment is assembled in a vehicle. The drawings marked with a diagonal line do not necessarily represent a cross-sectional view.

[0027] For the components or sites marked with at least a symbol, at least one is provided unless it is previously declared as "only one" or the like. The seat shown in the present disclosure includes at least one of the constituent elements such as the components or sites marked with a symbol and the structural sites illustrated.

[0028] (First Embodiment)

[0029] <1. Overview of Vehicle Seat>

[0030] As shown in FIG. 1, the vehicle seat 1 is provided with a seat cushion 3, a seat backrest (not shown), a lifting mechanism 5, and a posture conversion mechanism 7. The seat cushion 3 is a site for supporting the buttocks of a seated person. Figure 1

[0031] ​The seat back is a portion for supporting the back of a seated person. The seat back is connected to the rear end side of the seat cushion 3. In addition, the seat back is connected to the seat cushion 3 in a manner capable of swinging in the front-rear direction of the seat.

[0032] The lifting mechanism 5 is a mechanism that displaces the seat cushion 3 in a manner that the seat cushion 3 as a whole moves in parallel. The posture conversion mechanism 7 is a mechanism for converting the posture of the seat cushion 3 between a comfortable posture and a regular posture.

[0033] As shown in Figure 2 , the comfortable posture refers to a posture in which the position of the front end side of the seat cushion 3 is higher than the position of the rear end side of the seat cushion 3. As shown in Figure 1 , the regular posture refers to a posture in which the difference in height between the position of the front end side of the seat cushion 3 and the position of the rear end side of the seat cushion 3 is smaller than in the comfortable posture.

[0034] That is, the regular posture is mainly a posture that a driver of a vehicle uses when driving the vehicle. The lifting mechanism 5 of the present embodiment displaces the seat cushion 3 in the regular posture state.

[0035] The seat cushion 3 is connected to the slide device 9 via the lifting mechanism 5 and the posture conversion mechanism 7. In addition, the posture conversion mechanism 7 functions as a lifting link of the lifting mechanism 5 when the lifting mechanism 5 is actuated.

[0036] In addition, the lifting mechanism 5 has lifting links 5A, 5B (refer to Figure 3 ). The lifting links 5A, 5B are links for displacing the rear end side of the seat cushion 3 in a lifting manner. Also, the posture conversion mechanism 7 functions as a lifting link for displacing the front end side of the seat cushion 3 in a lifting manner when the lifting mechanism 5 is actuated.

[0037] The slide device 9 supports the seat cushion 3 so as to be displaceable in the front-rear direction. In addition, in the present embodiment, the seat cushion 3 is supported by two slide devices 9. Each slide device 9 has at least a movable guide rail 9A and a fixed guide rail 9B, and the like.

[0038] Each fixed guide rail 9B is a guide rail member fixed to a vehicle. The movable guide rail 9A is one example of a base member that is connected to the fixed guide rail 9B in a slidable manner. Thus, the seat cushion 3 is capable of sliding displacement with respect to the vehicle.

[0039] <2. Configuration of the seat cushion frame and the posture conversion mechanism, etc.>

[0040] <2.1 Configuration of the seat cushion frame>

[0041] The cushion frame 10 is a strength member that constitutes a skeleton of the seat cushion 3. As shown in Figure 1 FIG. 1, the cushion frame 10 has at least a first side frame 11, a second side frame 12, a front side bar 13, and a rear side bar 14, and the like.

[0042] The first side frame 11 is a lower arm disposed at one end side in the seat width direction and extending in the seat front-rear direction. The second side frame 12 is a lower arm disposed at the other end side in the seat width direction and extending in the seat front-rear direction.

[0043] The front side bar 13 extends in the seat width direction and links the front end sides of the first side frame 11 and the second side frame 12 to each other, and the front side bar 13 is rotatably linked to each of the side frames 11, 12.

[0044] The rear side bar 14 extends in the seat width direction and links the rear end sides of the first side frame 11 and the second side frame 12 to each other, and the rear side bar 14 is rotatably linked to each of the side frames 11, 12. In addition, the upper end sides of the lift links 5A, 5B are integrated with the rear side bar 14 by a joining method such as welding.

[0045] As shown in Figure 3 , the lower end sides of the lift links 5A, 5B are rotatably linked to the corresponding movable rails 9A via brackets 5C, 5D, respectively. In other words, the rear end sides of the cushion frame 10 are indirectly rotatably linked to the movable rails 9A via the lift links 5A, 5B.

[0046] That is, the lift link 5A and the bracket 5C function as a linking portion that indirectly rotatably links the rear end side of the first side frame 11 to the movable rail 9A. The lift link 5B and the bracket 5D function as a linking portion that indirectly rotatably links the rear end side of the second side frame 12 to the movable rail 9A.

[0047] An actuator 5E (see Figure 3 ) is provided on the first side frame 11 or the second side frame 12 (the first side frame 11 in the present embodiment).

[0048] Thus, when the actuator 5E operates to cause the rear side bar 14 to rotate, the lift links 5A, 5B are displaced in rotation relative to the cushion frame 10, and the cushion frame 10 is displaced in elevation in conjunction with this displacement in rotation.

[0049] <2.2 Configuration of the posture conversion mechanism>

[0050] As shown in Figure 3As shown, the posture changing mechanism 7 has a drive-side changing mechanism 71 and a driven-side changing mechanism 72. The drive-side changing mechanism 71 generates a driving force that changes the posture of the seat cushion 3. The driven-side changing mechanism 72 receives the driving force from the drive-side changing mechanism 71 and works in cooperation with the drive-side changing mechanism 71 to change the posture of the seat cushion 3.

[0051] <2.3 Composition of the Drive-Side Transformation Mechanism>

[0052] like Figure 4 As shown, the drive-side conversion mechanism 71 includes at least a first drive-side connecting rod 71A, a second drive-side connecting rod 71B, a sector gear 71C, and an actuator 71D. Figure 5 As shown, the lower end of the first drive-side connecting rod 71A is rotatably connected to the movable guide rail 9A via the bracket 71E.

[0053] The lower end of the second drive-side link 71B is rotatably connected to the upper end of the first drive-side link 71A. The upper end of the second drive-side link 71B is rotatably connected to the first side frame 11.

[0054] Specifically, the upper end of the second drive-side link 71B is integrally fixed to the front rod 13 by welding or other means, and the front rod 13 is rotatably connected to the first side frame 11. Therefore, the upper end of the second drive-side link 71B is configured to be rotatably connected to the first side frame 11.

[0055] like Figure 6 As shown, the connection portion J1 between the first drive-side link 71A and the second drive-side link 71B is located between the sector gear 71C and the first side frame 11. Furthermore, in this embodiment, the connection portion J1 is located at a position spaced apart from the sector gear 71C towards the first side frame 11.

[0056] Furthermore, the second drive-side link 71B is located between the first drive-side link 71A and the first side frame 11. That is, in the seat width direction, the second drive-side link 71B is located on the side closer to the first side frame 11 relative to the first drive-side link 71A.

[0057] In this embodiment, such as Figure 5 As shown, the link length Lk1 of the first drive-side link 71A is longer than the link length Lk2 of the second drive-side link 71B. Furthermore, the connection center between the first drive-side link 71A and the movable guide rail 9A is located at a point O2 higher than the center of the front member 13 (see reference). Figure 7 (At the front)

[0058] like Figure 6As shown, the sector gear 71C is integrally fixed to the front rod 13 by welding or other means. Therefore, when the sector gear 71C rotates, the front rod 13 rotates accordingly, thereby causing the second drive-side connecting rod 71B to rotate around the axis L1.

[0059] Furthermore, axis L1 is the central axis of the front rod 13. The rotation center of the sector gear 71C is located on axis L1. That is, the rotation center of the sector gear 71C, as well as the rotation center of the connection between the second drive-side connecting rod 71B and the first side frame 11, are both located on axis L1.

[0060] Furthermore, in this embodiment, the rotation center of the sector gear 71C and the rotation center connecting the second drive-side link 71B and the first side frame 11 are spaced apart from each other in the direction of axis L1. Therefore, the front rod 13 functions as a transmission part that transmits the rotation of the sector gear 71C to the second drive-side link 71B.

[0061] Actuator 71D generates a driving force that drives the sector gear 71C to rotate. Actuator 71D has an electric motor (not shown) and a reducer (not shown).

[0062] The electric motor outputs rotational force. The reducer is a gear mechanism with at least a worm and a worm wheel, which reduces the output of the electric motor before outputting it. Additionally, the actuator 71D is fixed to the first drive-side connecting rod 71A.

[0063] Because the actuator 71D has both an electric motor and a gearbox, it is practically impossible to rotate the electric motor by applying rotational force to the output shaft of the gearbox from the outside. This phenomenon will be referred to as the "self-locking function" below.

[0064] Moreover, such as Figure 7 As shown, the center of the connection between the first drive-side link 71A and the second drive-side link 71B (hereinafter referred to as the "connection center") is located behind the second center O2. Furthermore, in the normal position, this movement center Om is located above the centerline Lc.

[0065] Additionally, the centerline Lc refers to a virtual line that passes through the first center O1 and the second center O2 and extends along the front-to-back direction of the seat. The first center O1 refers to the connection center between the lifting link 5A and the first side frame 11.

[0066] The second center 02 refers to a joint center of the second driving-side link 71B and the first side frame 11. In addition, the first center 01 of the present embodiment is located on the central axis of the rear side link member 14. The second center 02 of the present embodiment is located on the central axis of the front side link member 13.

[0067] <2.4 Configuration of the driven-side conversion mechanism>

[0068] As shown in Figure 8 , the driven-side conversion mechanism 72 includes at least a first driven-side link 72A and a second driven-side link 72B. The first driven-side link 72A is a link corresponding to the first driving-side link 71A. The second driven-side link 72B is a link corresponding to the second driving-side link 71B.

[0069] That is, the lower end side of the first driven-side link 72A is rotatably connected to the movable guide rail 9A. The lower end side of the second driven-side link 72B is rotatably connected to the upper end side of the first driven-side link 72A. The upper end side of the second driven-side link 72B is rotatably connected to the second side frame 12 via the front side link member 13.

[0070] In addition, no driving mechanism such as a sector gear and an actuator is provided on the driven-side conversion mechanism 72. That is, the driving force of the actuator 71D is transmitted to the driven-side conversion mechanism 72, i.e., to the second driven-side link 72B and the first driven-side link 72A, via the front side link member 13.

[0071] <3. Action of the posture conversion mechanism and features of the vehicle seat of the present embodiment>

[0072] <3.1 Action of the posture conversion mechanism>

[0073] In a state where the actuator 71D is stopped, the angle θ1 (see Figure 5 ) formed between the first driving-side link 71A and the second driving-side link 71B, and the angle θ2 (see Figure 8 ) formed between the first driven-side link 72A and the second driven-side link 72B are maintained in the current state by the self-locking function.

[0074] Therefore, in a state where the actuator 71D is stopped, when the actuator 5E of the lifting mechanism 5 is operated, the lifting links 5A and 5B are swing-displaced with respect to the movable guide rail 9A while the angles θ1 and θ2 are maintained, so that the seat cushion 3 is lifted and lowered as a whole in a parallel movement.

[0075] Furthermore, when the actuator 5E of the lifting mechanism 5 is in a stopped state, and the actuator 71D of the posture changing mechanism 7 is activated, the angles θ1 and θ2 change, so the front end of the seat cushion 3 moves up or down relative to the rear end of the seat cushion 3.

[0076] <3.2 Characteristics of Seats for Transportation Vehicles>

[0077] like Figure 9 As shown, when a large external force Fo that stretches the first side frame backward is applied to the first side frame 11, the force F1 that reduces the angle θ1 formed between the first driving side link 71A and the second driving side link 71B is applied to the second center O2, that is, to the front side member 13.

[0078] In addition, when the external force Fo acts on the second side frame 12, the same as the first side frame 11, the force F1 that reduces the angle θ2 formed between the first driven side link 72A and the second driven side link 72B acts on the front side member 13.

[0079] Therefore, in the vehicle seat 1 of this embodiment, when the aforementioned external force Fo acts on the first side frame 11 and the second side frame 12, a force is generated on the seat cushion 3 that causes the front end of the seat cushion 3 to descend. This prevents the unintended upward displacement of the front end of the seat cushion 3 from occurring.

[0080] like Figure 6 As shown, the connection point J1 between the first drive-side link 71A and the second drive-side link 71B is located between the sector gear 71C and the first side frame 11 in the seat width direction. Therefore, in this vehicle seat 1, as... Figure 10 As shown, the connecting part J1 is offset outward relative to the cushioning pad 3A of the seat cushion 3 in the seat width direction.

[0081] Therefore, interference between the posture transformation mechanism 7 and the lower surface of the buffer pad 3A can be suppressed (see reference). Figure 10 (Part A). Furthermore, since there is no need to install a cover or the like for covering the upper side of the posture changing mechanism 7, the increase in manufacturing cost of the vehicle seat 1 can be suppressed.

[0082] In this embodiment, since the outer diameter of the sector gear 71C is relatively large, if the sector gear 71C is located at a position greater than... Figure 6 At the position shown, which is offset outward in the width direction of the seat, the sector gear 71C will interfere with the sliding device 9.

[0083] (Second Implementation)

[0084] The second drive-side link 71B of the above embodiment is connected to the sector gear 71C via the front-side link member 13. In this embodiment, as shown in FIG. 7, the second drive-side link 71B is integrated with the sector gear 71C, and the integrated second drive-side link 71B is connected to the first drive-side link 71A in a rotatable manner. Figure 11

[0085] Further, a step portion 71F is formed at the connection portion of the sector gear 71C and the second drive-side link 71B. Therefore, the second drive-side link 71B is offset to the outside in the seat width direction with respect to the sector gear 71C, that is, to the first side frame 11 side.

[0086] Therefore, in this embodiment, the connection point J1 of the first drive-side link 71A and the second drive-side link 71B is located between the sector gear 71C and the first side frame 11 in the seat width direction.

[0087] (Other Embodiments)

[0088] In the above embodiment, the movement center Om is located at a position higher than the center line Lc when in the normal posture. However, the present disclosure is not limited thereto. For example, instead, the present disclosure can be such that the movement center Om is at the same height as the center line Lc when in the normal posture.

[0089] In the above embodiment, the posture conversion mechanism 7 is configured to be disposed at the front end side of the seat cushion 3. However, the present disclosure is not limited thereto. For example, instead, the present disclosure can be configured such that the posture conversion mechanism 7 is disposed at the rear end side of the seat cushion 3, or the posture conversion mechanism 7 is disposed at the front end side and the rear end side of the seat cushion 3.

[0090] In the above embodiment, the link length Lk1 of the first drive-side link 71A is longer than the link length Lk2 of the second drive-side link 71B. However, the present disclosure is not limited thereto. For example, instead, the present disclosure can be configured such that the link length Lk1 is shorter than the link length Lk2, or the link length Lk1 is the same as the link length Lk2.

[0091] In the above embodiment, the lifting mechanism 5 is provided. However, the present disclosure is not limited thereto. For example, instead, the present disclosure can be configured to omit the lifting mechanism 5. In this configuration, the first side frame 11 and the second side frame 12 are connected to the movable rail 9A in a rotatable manner without the lifting links 5A and 5B.

[0092] ​In the above-described embodiments, the vehicle seat 1 is configured to be fixed to the floor of the vehicle via the slide device 9. However, the present disclosure is not limited thereto. For example, instead, the present disclosure can be configured such that the vehicle seat 1 is directly fixed to the floor of the vehicle without the slide device 9.

[0093] In the above-described embodiments, the vehicle seat of the present disclosure is applied to a vehicle. However, the application of the invention disclosed in the present specification is not limited thereto. Instead, the present disclosure can also be applied to seats used in vehicles such as railway vehicles, ships, and aircraft, and fixed-type seats used in theaters or homes, and the like.

[0094] Further, the present disclosure is not limited to the above-described embodiments as long as it conforms to the gist of the invention described in the above-described embodiments. Therefore, it can be a structure in which at least two of the above-described embodiments are combined, or a structure in which any one of the constituent elements illustrated in the above-described embodiments is omitted, or a structure in which any one of the constituent elements described using reference numerals in the above-described embodiments is omitted.

Claims

1. A seat capable of causing one end side of a seat cushion in a front-rear direction to be displaced in a lifting manner, characterized by comprising: an extension direction along a front-rear direction of the seat; and a posture conversion mechanism having a first link and a second link for connecting the other end side of the side frame in the extension direction to the base member, and a sector gear that is rotated by a driving force and changes an angle formed between the first link and the second link by the rotation of the sector gear, thereby causing the one end side of the seat cushion in the front-rear direction to be displaced in a lifting manner, wherein a lower end side of the first link in a longitudinal direction is connected to the base member in a rotatable manner, a lower end side of the second link in the longitudinal direction is connected to an upper end side of the first link in the longitudinal direction in a rotatable manner, an upper end side of the second link in the longitudinal direction is connected to the side frame in a rotatable manner, and a connecting point of the first link and the second link is located between the sector gear and the side frame in a seat width direction of the seat. side frames extending along an extending direction and constituting a part of a seat cushion frame, and having a joint portion directly or indirectly joining one end side of the side frames in the extending direction to the base member in a rotatable manner, wherein 2. The seat according to claim 1, wherein the second link is located between the first link and the side frame in the seat width direction of the seat.

3. The seat according to claim 2, wherein a rotation center of the sector gear and a connecting rotation center between the second link and the side frame are located on the same axis, and the rotation center and the connecting rotation center are separated from each other in the axis direction by a distance, and the seat further comprises a transmission portion that transmits the rotation of the sector gear to the second link.

4. The seat according to any one of claims 1 to 3, wherein when a connecting center of the base member and the side frame in the connecting portion is a first center, a connecting center of the second link and the side frame is a second center, a virtual line that passes through the first center and the second center and extends in the front-rear direction of the seat is a center line, and a connecting center of the first link and the second link is a movement center, the movement center is located at a position that is rearward of the second center, and at least when the seat cushion is in a normal posture in which the one end side of the seat cushion in the front-rear direction is lowered, the movement center is located at the same height as the center line or at a position that is higher than the center line. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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