vehicle

Abstract

This prevents a decrease in the occupant restraint performance due to shoulder webbing when the pretensioner is activated. [Solution] The vehicle includes a pretensioner for winding up the shoulder webbing of the seat belt device, a guide device having an insertion portion through which the shoulder webbing is inserted and configured to slide in the vehicle width direction, and a locking mechanism configured to allow the guide device to slide under normal conditions and to restrict the sliding of the guide device when the pretensioner is activated. The locking mechanism has a roller provided on the lower side of the insertion portion of the guide device on the outer side in the vehicle width direction. When the shoulder webbing is wound up by the operation of the pretensioner, the roller of the locking mechanism is pressed downward by the shoulder webbing, and in conjunction with the rotation of the roller of the locking mechanism as the shoulder webbing moves, the locking mechanism begins to restrict the sliding of the guide device.

Description

Technical Field

[0001] The present invention relates to a vehicle.

Background Art

[0002] In order to improve the safety of passengers of various body types such as children and adults, vehicles equipped with a guide device configured to reciprocate the shoulder webbing of a seat belt device in the vehicle width direction above the rear seat are widespread.

[0003] For example, Patent Document 1 discloses a seat belt device including a support means for supporting the upper end portion of the shoulder webbing above one side in the width direction of a vehicle seat, and a guide means having a planar guide surface inclined downward from one side in the width direction to the other side, the support means being configured to be reciprocable along the guide surface.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, in recent years, vehicles equipped with a pretensioner that instantaneously winds up the shoulder webbing of a seat belt device when receiving a strong impact from the front to enhance the restraint performance of a passenger have been developed. When the pretensioner operates, the shoulder webbing is pulled at high speed outward and downward in the vehicle width direction.

[0006] When a guide device is installed in a vehicle equipped with such a pretensioner, the guide device moves rapidly outward in the vehicle width direction along with the high-speed movement of the shoulder webbing when the pretensioner is activated. This could cause the shoulder webbing to detach from the occupant's shoulders. If the shoulder webbing detaches from the occupant's shoulders, there is a problem in that the occupant restraint performance provided by the shoulder webbing is reduced.

[0007] In view of these problems, the present invention aims to provide a vehicle that can prevent a decrease in the occupant restraint performance by the shoulder webbing when the pretensioner is activated. [Means for solving the problem]

[0008] To solve the above problems, a vehicle according to one embodiment of the present invention is: When a vehicle collision is detected, a pretensioner retracts the shoulder webbing of the seat belt device, A guide device having an insertion portion through which the shoulder webbing of the seat belt device is inserted, and configured to be slidable in the vehicle width direction, A locking mechanism is configured to allow the guide device to slide under normal conditions, and to restrict the sliding of the guide device when the pretensioner is activated. Equipped with, The locking mechanism has a roller provided on the lower side of the insertion portion of the guide device that is on the outer side in the vehicle width direction, When the shoulder webbing of the seat belt device is retracted by the operation of the pretensioner, the roller of the locking mechanism is pressed downward by the shoulder webbing of the seat belt device, and in conjunction with the rotation of the roller of the locking mechanism as the shoulder webbing of the seat belt device moves, the locking mechanism begins to restrict the sliding of the guide device. [Effects of the Invention]

[0009] According to the present invention, it is possible to prevent a decrease in the occupant restraint performance due to the shoulder webbing when the pretensioner is activated. [Brief explanation of the drawing]

[0010] [Figure 1] Figure 1 is a schematic diagram showing the general configuration of a vehicle according to an embodiment of the present invention. [Figure 2] Figure 2 is a front view of the guide device according to the same embodiment. [Figure 3] Figure 3 is a top view of the guide device according to the same embodiment. [Figure 4] Figure 4 is a front view of the locking mechanism according to the same embodiment. [Figure 5] Figure 5 is a magnified view of a portion of Figure 4. [Figure 6] Figure 6 is a schematic diagram showing a side view of the locking mechanism according to the same embodiment. [Figure 7] Figure 7 is a diagram illustrating the engaged portion according to the same embodiment. [Figure 8] Figure 8 is a first diagram illustrating the operation of the locking mechanism according to the same embodiment. [Figure 9] Figure 9 is a second diagram illustrating the operation of the locking mechanism according to the same embodiment. [Figure 10] Figure 10 is a third diagram illustrating the operation of the locking mechanism according to the same embodiment. [Modes for carrying out the invention]

[0011] Embodiments of the present invention will be described in detail below with reference to the attached drawings. The specific dimensions, materials, numerical values, etc., shown in these embodiments are merely examples to facilitate understanding of the invention and do not limit the present invention unless otherwise specified. In this specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals to avoid redundant explanations, and elements not directly related to the present invention are omitted from the illustrations.

[0012] <1. Configuration of the vehicle> First, referring to FIG. 1, the configuration of the vehicle 100 according to an embodiment of the present invention will be described. FIG. 1 is a schematic diagram showing the general configuration of the vehicle 100 according to an embodiment of the present invention. As shown in FIG. 1, the vehicle 100 includes, for example, a seat belt device 120, a pretensioner 140, a guide device 150, a lock mechanism 170, and a control device 180.

[0013] The seat belt device 120 is provided on the seat 110 of the vehicle 100. The seat 110 is, for example, the rear seat 112. FIG. 1 shows an example in which the seat belt device 120 is provided on the rear seat 112 directly behind the driver's seat. Note that the seat belt device 120, the guide device 150, and the lock mechanism 170 according to the present embodiment may be provided on the seat 110 of the vehicle 100, and are not limited to the rear seat 112, and may be provided on the driver's seat or the passenger seat.

[0014] The seat belt device 120 includes a webbing 122, a tongue 128, a buckle 130, a retractor 132, and an anchor 134.

[0015] The webbing 122 is formed of a belt-shaped cloth member. The webbing 122 has a lap webbing 124 and a shoulder webbing 126.

[0016] The tongue 128 is slidably attached to the webbing 122. The buckle 130 is provided inside the vehicle width direction (±X direction in FIG. 1) of the rear seat 112. The buckle 130 is configured to be able to fix the tongue 128. When the tongue 128 is inserted into the buckle 130, the tongue 128 is fixed to the vehicle body 102.

[0017] The retractor 132 is located behind the rear seat 112 (in the +Y direction in Figure 1) and below the top of the seat back 112a of the rear seat 112 (in the -Z direction in Figure 1). The retractor 132 is also located outside the rear seat 112 in the vehicle width direction (in the ±X directions in Figure 1). The retractor 132 is, for example, mounted on the vehicle body 102 of the vehicle 100. The retractor 132 winds up one end of the webbing 122.

[0018] Anchor 134 secures the other end of the webbing 122 to the vehicle body 102.

[0019] The wrap webbing 124, which is the portion of webbing 122 from anchor 134 to tongue 128, restrains the lower body, specifically the waist, of the occupant seated in the rear seat 112. The shoulder webbing 126, which is the portion of webbing 122 from tongue 128 to retractor 132, restrains the upper body of the occupant seated in the rear seat 112.

[0020] The pretensioner 140 is installed on the retractor 132. When a collision of the vehicle 100 is detected, the pretensioner 140 drives the retractor 132 to wind up the shoulder webbing 126 of the seat belt device 120. The pretensioner 140 has, for example, an explosive, and by applying the force of the gas generated by the explosion of the explosive to the retractor 132, it instantaneously winds up the shoulder webbing 126 in the direction indicated by the white arrow in Figure 1. Here, instantaneous means, for example, several tens of milliseconds.

[0021] The guide device 150 is located on the upper part of the seat back 112a of the rear seat 112, on the outer side in the vehicle width direction (direction -X in Figure 1). The guide device 150 is configured to slide in the vehicle width direction (directions ±X in Figure 1). The guide device 150 has an insertion portion 154 through which the shoulder webbing 126 of the seat belt device 120 is inserted. Details of the guide device 150 will be described later.

[0022] The locking mechanism 170 is configured to allow the guide device 150 to slide under normal conditions, and to restrict the sliding of the guide device 150 when the pretensioner 140 is activated. "Normal conditions" refers to the state when the pretensioner 140 is not activated. Details of the locking mechanism 170 will be described later.

[0023] The control device 180 includes one or more processors 182 and one or more memories 184 connected to the processors 182. The processors 182 include, for example, a CPU (Central Processing Unit). The memories 184 include, for example, ROM (Read Only Memory) and RAM (Random Access Memory). ROM is a memory element that stores programs and arithmetic parameters used by the CPU. RAM is a memory element that temporarily stores data such as variables and parameters used in processing executed by the CPU.

[0024] The control device 180 detects the acceleration of the vehicle 100 during a collision and activates the pretensioner 140 using an electrical signal.

[0025] As described above, the vehicle 100 according to this embodiment is equipped with a guide device 150. This allows the vehicle 100 according to this embodiment to have the shoulder webbing 126 of the seat belt device 120 follow the upper body of the occupant, regardless of the occupant's body type, such as a child or an adult. Therefore, the vehicle 100 according to this embodiment can improve occupant safety regardless of the occupant's body type due to the restraint performance of the shoulder webbing 126 of the seat belt device 120.

[0026] Incidentally, as described above, the vehicle 100 is equipped with a pretensioner 140 that instantly retracts the shoulder webbing 126 of the seat belt device 120 when it receives a strong impact from the front, thereby enhancing the occupant restraint performance. When the pretensioner 140 is activated, the shoulder webbing 126 is pulled at high speed in the direction indicated by the white arrow in Figure 1, that is, outward in the vehicle width direction (direction -X in Figure 1) and downward (direction -Z in Figure 1). At this time, if the guide device 150 moves at high speed outward in the vehicle width direction (direction -X in Figure 1) along with the high-speed movement of the shoulder webbing 126, there is a risk that the shoulder webbing 126 may come off the occupant's shoulder.

[0027] Therefore, the vehicle 100 according to this embodiment is equipped with a locking mechanism 170 that restricts the sliding of the guide device 150. The details of the guide device 150 and the locking mechanism 170 will be described below.

[0028] <2. Guide device> Next, the configuration of the guide device 150 according to this embodiment will be described with reference to Figures 2 and 3. Figure 2 is a front view of the guide device 150 according to this embodiment. Figure 3 is a top view of the guide device 150 according to this embodiment.

[0029] As shown in Figures 2 and 3, the guide device 150 according to this embodiment includes, for example, a guide body 152, an insertion portion 154, a notch 156, and a sliding portion 158.

[0030] The guide body 152 is located on the upper part of the seat back 112a of the rear seat 112, on the outer side in the vehicle width direction (direction -X in Figures 2 and 3). The upper part of the guide body 152 is located above the seat back 112a of the rear seat 112, and the lower part of the guide body 152 is located inside the seat back 112a of the rear seat 112.

[0031] The insertion portion 154 is formed in the guide body 152. The insertion portion 154 is formed, for example, on the upper part of the guide body 152. In other words, the insertion portion 154 is provided above the seat back 112a of the rear seat 112. The XZ cross-section of the insertion portion 154 is, for example, substantially rectangular.

[0032] The notch 156 is formed at the upper end of the guide body 152 and communicates with the insertion portion 154. The notch 156 is sized to allow the shoulder webbing 126 of the seat belt device 120 to pass through. The shoulder webbing 126 of the seat belt device 120 is inserted into the insertion portion 154 through the notch 156.

[0033] The sliding portion 158 is provided at the lower part of the guide body 152. The sliding portion 158 slides the guide body 152 in the vehicle width direction (±X direction in Figures 2 and 3). The sliding portion 158 has, for example, one or more wheels 160 and a rail portion 162. The axis of rotation of the wheel 160 extends, for example, in the longitudinal direction of the vehicle 100 (±Y direction in Figures 2 and 3). The rail portion 162 is provided below the wheel 160. The rail portion 162 is provided, for example, on the seat back frame 112b (see Figure 6, etc.) provided within the seat back 112a of the rear seat 112. The rail portion 162 extends in the vehicle width direction (±X direction in Figures 2 and 3). As the wheel 160 rolls on the rail portion 162, the guide body 152 slides in the vehicle width direction (±X direction in Figures 2 and 3).

[0034] <3. Locking Mechanism> Next, the configuration of the locking mechanism 170 according to this embodiment will be described with reference to Figures 4 to 7. Figure 4 is a front view of the locking mechanism 170 according to this embodiment. Figure 5 is a partially enlarged view of Figure 4. Figure 6 is a schematic diagram showing a side view of the locking mechanism 170 according to this embodiment. Figure 7 is a diagram illustrating the engaged portion 250 according to this embodiment.

[0035] As shown in Figures 4 to 6, a part of the locking mechanism 170 according to this embodiment is provided within the guide body 152 of the guide device 150.

[0036] The locking mechanism 170 has a roller 210. The roller 210 is provided on the lower side (-Z direction in Figures 4 to 6) of the insertion portion 154 of the guide device 150, on the outer side in the vehicle width direction (-X direction in Figures 4 to 6). In this embodiment, the roller 210 is positioned at the lower corner portion 154a of the insertion portion 154 of the guide device 150, on the outer side in the vehicle width direction (-X direction in Figures 4 to 6).

[0037] The roller 210 is configured to be able to contact the shoulder webbing 126 of the seat belt device 120. In this embodiment, a portion of the roller 210 is exposed into the insertion portion 154 of the guide device 150 from the corner portion 154a of the insertion portion 154, and contacts the shoulder webbing 126 of the seat belt device 120 when the pretensioner 140 is activated.

[0038] Furthermore, as shown in Figure 5, in this embodiment, the roller 210 may have a rotation axis 212 that inclins downward (in the -Z direction in Figure 5) as it moves from the outer side in the vehicle width direction (the -X direction in Figure 5) to the inner side in the vehicle width direction (the +X direction in Figure 5). The roller 210 is rotatably mounted with the rotation axis 212 as its center of rotation. There are no limitations on the inclination angle of the rotation axis 212 of the roller 210. Also, the rotation axis 212 of the roller 210 may inclin upward (in the +Z direction in Figure 5) as it moves from the outer side in the vehicle width direction (the -X direction in Figure 5) to the inner side in the vehicle width direction (the +X direction in Figure 5). Also, the rotation axis 212 of the roller 210 may extend in the vehicle width direction (the ±X directions in Figure 5).

[0039] Both ends of the rotating shaft 212 are biased upward (in the +Z direction in Figure 5) by the first biasing part 214 via the bearing 212a. The first biasing part 214 is composed of, for example, an elastic member. The elastic member is, for example, a coil spring. As will be described in more detail later, when the roller 210 is pressed outward in the vehicle width direction (in the -X direction in Figure 5) and downward (in the -Z direction in Figure 5) by the shoulder webbing 126 of the seat belt device 120, the rotating shaft 212 moves outward in the vehicle width direction (in the -X direction in Figure 5) and downward (in the -Z direction in Figure 5) against the biasing force of the first biasing part 214.

[0040] Furthermore, in this embodiment, the roller 210 may be composed of a tapered guide roller that is rotatably mounted around the rotation axis 212. For example, the roller 210 may be composed of a tapered, double-conical guide roller whose diameter gradually decreases toward the center. In other words, the roller 210 may have a tapered shape with an outer diameter that gradually decreases from the outer end 210a in the vehicle width direction (direction -X in Figure 5) toward the center 210c, and an outer diameter that gradually decreases from the inner end 210b in the vehicle width direction (direction +X in Figure 5) toward the center 210c. There are no limitations on the shape of the roller 210. For example, the roller 210 may be a tapered, double-conical guide roller whose diameter gradually increases toward the center. Alternatively, the roller 210 may have a tapered shape with an outer diameter that gradually decreases from the outer end 210a in the vehicle width direction (direction -X in Figure 5) toward the inner end 210b in the vehicle width direction (direction +X in Figure 5). Furthermore, the roller 210 may have a tapered shape with an outer diameter that gradually increases from the outer end 210a in the vehicle width direction (direction -X in Figure 5) to the inner end 210b in the vehicle width direction (direction +X in Figure 5). Alternatively, the roller 210 may be cylindrical.

[0041] Alternatively, the roller 210 may be positioned at the lower corner portion 154a of the insertion portion 154 on the outer side in the vehicle width direction (direction -X in Figure 5).

[0042] In this embodiment, it is preferable that the locking mechanism 170 includes, in addition to the roller 210, a first gear 220, a second gear 230, an engaging portion 240, an engaged portion 250, and a centrifugal clutch device 260.

[0043] The first gear 220 is provided on the outer circumference of the roller 210. In this embodiment, the first gear 220 is provided on the outer circumference of the roller 210 on the end 210a side. The first gear 220 rotates together with the roller 210, with the rotation axis 212 of the roller 210 as its center of rotation.

[0044] The second gear 230 is positioned below the first gear 220 (in the -Z direction in Figures 5 and 6) so as to mesh with the first gear 220. The first gear 220 and the second gear 230 are, for example, helical gears. The axis of rotation 212 of the first gear 220 and the axis of rotation 232 of the second gear 230 are, for example, oblique axes. In this embodiment, the second gear 230 is always meshed with the first gear 220. The second gear 230 is rotated by the rotation of the first gear 220. In other words, the first gear 220 is the driving gear, and the second gear 230 is the driven gear.

[0045] The second gear 230 has, for example, a rotating shaft 232 that extends in the vehicle width direction (±X direction in Figures 5 and 6). Similar to the rotating shaft 212, both ends of the rotating shaft 232 are biased upward (+Z direction in Figures 5 and 6) by a second biasing part 234 via bearings 232a. The second biasing part 234 is composed of, for example, an elastic member. The elastic member is, for example, a coil spring. As described above, when the roller 210 is pressed outward in the vehicle width direction (-X direction in Figures 5 and 6) and downward (-Z direction in Figures 5 and 6) by the shoulder webbing 126 of the seat belt device 120, the rotating shaft 212 moves outward in the vehicle width direction (-X direction in Figures 5 and 6) and downward (-Z direction in Figures 5 and 6) against the biasing force of the first biasing part 214. Furthermore, as the roller 210 is pressed, the second gear 230, which meshes with the first gear 220, is also pressed downward (in the -Z direction in Figures 5 and 6), and the rotating shaft 232 moves downward (in the -Z direction in Figures 5 and 6) against the biasing force of the second biasing part 234.

[0046] The engaging portion 240 is configured to be movable in accordance with the rotation of the second gear 230. As shown in Figure 6, the engaging portion 240 includes, for example, a cylinder 242, a piston 244, a third biasing portion 246, and a rotating pawl 248.

[0047] The cylinder 242 extends, for example, in the longitudinal direction of the vehicle 100 (±Y direction in Figure 6). The opening of the cylinder 242 faces the rear side of the vehicle 100 (+Y direction in Figure 6). The piston 244 is slidably mounted inside the cylinder 242.

[0048] The third biasing member 246 is housed at the rear end of the piston 244 within the cylinder 242 (in the -Y direction in Figure 6). The third biasing member 246 is composed of, for example, an elastic member. The elastic member is, for example, a coil spring.

[0049] The rotating pawl 248 penetrates the upper wall of the cylinder 242. The rotating pawl 248 is, for example, L-shaped. The upper part of the rotating pawl 248 is positioned above the cylinder 242, and the lower part is positioned inside the cylinder 242. The rotation axis 248a of the rotating pawl 248 is positioned on the upper wall of the cylinder 242. Under normal conditions, the upper part of the rotating pawl 248 is not in contact with the second gear 230. Also under normal conditions, the lower part of the rotating pawl 248 presses the third biasing part 246 toward the front side of the vehicle 100 (in the -Y direction in Figure 6).

[0050] The engaged portion 250 is positioned opposite the engaging portion 240. As shown in Figures 6 and 7, the engaged portion 250 includes, for example, a plurality of holes 252 formed in the seat back frame 112b of the seat back 112a of the rear seat 112. The holes 252 are configured to be fitted onto the piston 244 of the engaging portion 240. The plurality of holes 252 are arranged in parallel, for example, in the vehicle width direction (±X direction in Figures 6 and 7).

[0051] The centrifugal clutch device 260 is installed inside the first gear 220. The centrifugal clutch device 260 is configured not to transmit the rotation of the roller 210 to the first gear 220 when the rotational speed of the roller 210 is below a predetermined speed, and to transmit the rotation of the roller 210 to the first gear 220 when the rotational speed of the roller 210 is above the predetermined speed. Here, the predetermined speed is, for example, the rotational speed of the roller 210 due to the movement of the shoulder webbing 126 accompanying the operation of the pretensioner 140. In detail, the centrifugal clutch device 260 is connected to the rotation shaft 212 of the roller 210. When the roller 210 rotates, the centrifugal clutch device 260 rotates due to the rotation shaft 212 which rotates in conjunction with the rotation of the roller 210. When the rotational speed of the roller 210 is above the predetermined speed, the centrifugal clutch device 260 operates and rotates the first gear 220. On the other hand, if the rotational speed of the roller 210 is below a predetermined speed, the centrifugal clutch device 260 does not operate and does not rotate the first gear 220.

[0052] <4. Operation of the locking mechanism> Next, the operation of the locking mechanism 170 according to this embodiment will be described with reference to Figures 8 to 10. Figure 8 is the first diagram illustrating the operation of the locking mechanism 170 according to this embodiment. Figure 9 is the second diagram illustrating the operation of the locking mechanism 170 according to this embodiment. Figure 10 is the third diagram illustrating the operation of the locking mechanism 170 according to this embodiment.

[0053] In this embodiment, when the shoulder webbing 126 of the seat belt device 120 is wound up by the operation of the pretensioner 140, the roller 210 of the locking mechanism 170 is pressed downward by the shoulder webbing 126 of the seat belt device 120, and in conjunction with the rotation of the roller 210 of the locking mechanism 170 as the shoulder webbing 126 of the seat belt device 120 moves, the locking mechanism 170 starts to restrict the sliding of the guide device 150.

[0054] In detail, under normal circumstances, when the occupant fastens the shoulder webbing 126 of the seat belt device 120, if the occupant lifts the shoulder webbing 126, the shoulder webbing 126 of the seat belt device 120 comes into contact with the upper surface of the insertion portion 154 of the guide device 150. Also, under normal circumstances, while the occupant is restrained by the shoulder webbing 126 of the seat belt device 120, the shoulder webbing 126 of the seat belt device 120 comes into contact with the lower corner portion 154b of the insertion portion 154 of the guide device 150 on the inward side in the vehicle width direction (+X direction).

[0055] On the other hand, as described above, the retractor 132 is positioned further outward (-X direction) and downward (-Z direction) than the guide device 150 (see Figure 1). Therefore, when the pretensioner 140 is activated, the shoulder webbing 126 of the seat belt device 120 is pulled outward (-X direction) and downward (-Z direction). As a result, as shown in Figure 8, the shoulder webbing 126 of the seat belt device 120 comes into contact with the corner portion 154a of the insertion portion 154 of the guide device 150, which is on the outward (-X direction) side in the vehicle width direction.

[0056] Furthermore, the outer surface of the roller 210 of the locking mechanism 170 is exposed at the corner portion 154a of the insertion portion 154 of the guide device 150. Therefore, when the pretensioner 140 is activated, the shoulder webbing 126 of the seat belt device 120 presses the roller 210 of the locking mechanism 170 downward (in the -Z direction). As a result, the roller 210 moves downward (in the -Z direction), and consequently, the rotating shaft 212, the first gear 220, and the second gear 230 also move downward (in the -Z direction). In addition, the shoulder webbing 126 of the seat belt device 120 moves in the direction of the retractor 132, that is, towards the rear of the vehicle 100 (in the +Y direction), while in contact with the roller 210 of the locking mechanism 170.

[0057] As a result, the roller 210 rotates toward the rear (+Y direction) of the vehicle 100. When the pretensioner 140 is activated, the rotational speed of the roller 210 becomes greater than or equal to the predetermined speed mentioned above, so the rotation of the roller 210 is transmitted to the first gear 220 by the centrifugal clutch device 260. As a result, as shown in Figure 9, the first gear 220 attached to the roller 210 rotates counterclockwise in Figure 9. In addition, the second gear 230 rotates clockwise in Figure 9.

[0058] Then, as the second gear 230 rotates, the engaging portion 240 moves toward the engaged portion 250 and engages with the engaged portion 250, thereby restricting the sliding of the guide device 150. More specifically, as shown in Figure 10, as the second gear 230 rotates, the upper part of the rotating pawl 248 rotates clockwise in Figure 10, and the lower part of the rotating pawl 248 lifts upward (in the +Z direction in Figure 10) with the rotation axis 248a as the center of rotation. This releases the pressing of the third biasing portion 246 by the rotating pawl 248. As a result, the third biasing portion 246 extends, and the piston 244 moves to the rear of the vehicle 100 (in the +Y direction in Figure 10) by the third biasing portion 246. The piston 244 then fits into the hole 252 of the engaged portion 250. In this way, the sliding of the guide device 150 in the vehicle width direction (±X direction in Figure 10) is restricted.

[0059] <5. Vehicle Effects> Next, the effects of the vehicle 100 according to the embodiment of the present invention will be described.

[0060] The vehicle 100 according to this embodiment includes a pretensioner 140 that winds up the shoulder webbing 126 of the seat belt device 120 when a collision of the vehicle 100 is detected, a guide device 150 having an insertion portion 154 through which the shoulder webbing 126 of the seat belt device 120 is inserted and configured to be slidable in the vehicle width direction, and a lock mechanism 170 configured to allow the guide device 150 to slide under normal conditions and to restrict the sliding of the guide device 150 when the pretensioner 140 is activated, wherein the lock mechanism 170 is configured to allow the guide device 1 The locking mechanism 170 has a roller 210 provided on the lower side of the insertion portion 154 of the 50 on the outer side in the vehicle width direction. When the shoulder webbing 126 of the seat belt device 120 is wound up by the operation of the pretensioner 140, the roller 210 of the locking mechanism 170 is pressed downward by the shoulder webbing 126 of the seat belt device 120. In conjunction with the rotation of the roller 210 of the locking mechanism 170 due to the movement of the shoulder webbing 126 of the seat belt device 120, the locking mechanism 170 begins to restrict the sliding of the guide device 150.

[0061] Thus, the vehicle 100 according to this embodiment is equipped with a locking mechanism 170 configured to allow the guide device 150 to slide under normal conditions, and to restrict the sliding of the guide device 150 when the pretensioner 140 is activated. As a result, the vehicle 100 according to this embodiment can avoid the situation in which the shoulder webbing 126 comes off the occupant's shoulder when the pretensioner 140 is activated. Therefore, the vehicle 100 according to this embodiment can maintain the occupant restraint performance of the shoulder webbing 126 when the pretensioner 140 is activated.

[0062] Furthermore, the locking mechanism 170 according to this embodiment has a roller 210 provided on the lower side of the insertion portion 154 of the guide device 150, on the outer side in the vehicle width direction, and when the roller 210 is pressed downward and rotated, it starts restricting the sliding of the guide device 150. As described above, under normal conditions, the shoulder webbing 126 of the seat belt device 120 is in contact with the upper surface or the lower corner portion 154b on the inner side (+X direction) in the vehicle width direction of the insertion portion 154 of the guide device 150. Therefore, in this embodiment, by providing the roller 210 on the lower side of the insertion portion 154 of the guide device 150, on the outer side in the vehicle width direction, it is possible to avoid the situation in which the shoulder webbing 126 comes into contact with the roller 210 under normal conditions. Thus, the vehicle 100 according to this embodiment can prevent malfunction of the locking mechanism 170.

[0063] Furthermore, as described above, the retractor 132 is positioned outside and below the guide device 150 in the vehicle width direction. Therefore, when the pretensioner 140 is activated, the shoulder webbing 126 of the seat belt device 120 is pulled outward and downward in the vehicle width direction. As a result, the shoulder webbing 126 of the seat belt device 120 comes into contact with the lower side of the insertion portion 154 of the guide device 150, which is on the outside in the vehicle width direction. In this embodiment, by positioning the roller 210 on the lower side of the insertion portion 154 of the guide device 150, which is on the outside in the vehicle width direction, the shoulder webbing 126 can be efficiently brought into contact with the roller 210 when the pretensioner 140 is activated. This makes it possible for the vehicle 100 according to this embodiment to reliably restrict the sliding of the guide device 150 by the locking mechanism 170 when the pretensioner 140 is activated.

[0064] Furthermore, the locking mechanism 170 according to this embodiment starts restricting the sliding of the guide device 150 when the roller 210 is pressed downward and rotated. This makes it possible for the vehicle 100 according to this embodiment to further prevent malfunction of the locking mechanism 170.

[0065] The locking mechanism 170 further comprises a first gear 220 provided on the outer circumference of the roller 210, a second gear 230 provided below the first gear 220 so as to mesh with the first gear 220, an engaging portion 240 configured to be movable in accordance with the rotation of the second gear 230, and an engaged portion 250 positioned opposite the engaging portion 240. The engaging portion 240 may move toward the engaged portion 250 in accordance with the rotation of the second gear 230 and engage with the engaged portion 250, thereby restricting the sliding of the guide device 150.

[0066] As a result, the vehicle 100 according to this embodiment can, with a simple configuration, restrict the sliding of the guide device 150 by the locking mechanism 170 when the pretensioner 140 is activated.

[0067] The locking mechanism 170 may further include a centrifugal clutch device 260 provided inside the first gear 220, configured to not transmit the rotation of the roller 210 to the first gear 220 when the rotational speed of the roller 210 is less than a predetermined speed, and to transmit the rotation of the roller 210 to the first gear 220 when the rotational speed of the roller 210 is equal to or greater than the predetermined speed.

[0068] As a result, the vehicle 100 according to this embodiment can better prevent malfunction of the locking mechanism 170.

[0069] The roller 210 may have a rotating shaft 212 that is inclined downward as it moves from the outer side in the vehicle width direction to the inner side in the vehicle width direction.

[0070] This allows the shoulder webbing 126 to contact the roller 210 more efficiently when the pretensioner 140 is activated. As a result, the vehicle 100 according to this embodiment can more reliably operate the lock mechanism 170 to restrict the sliding of the guide device 150 when the pretensioner 140 is activated.

[0071] The roller 210 is composed of a tapered guide roller that is rotatably mounted around the rotation axis 212, and the roller 210 may be positioned at the lower corner portion 154a on the outer side in the vehicle width direction of the insertion portion 154.

[0072] This allows the shoulder webbing 126 to contact the roller 210 more efficiently when the pretensioner 140 is activated. As a result, the vehicle 100 according to this embodiment can more reliably restrict the sliding of the guide device 150 by the locking mechanism 170 when the pretensioner 140 is activated.

[0073] Preferred embodiments of the present invention have been described above with reference to the attached drawings, but it goes without saying that the present invention is not limited to these embodiments. It will be obvious to those skilled in the art that various modifications or alterations can be conceived within the scope of the claims, and these will naturally also fall within the technical scope of the present invention. [Explanation of Symbols]

[0074] 100 vehicles 120 Seat belt device 126 Shoulder Webbing 140 Pretensioner 150 Guide device 154 Insertion part 170 Locking mechanism 210 Laura 212 Rotation axis 220 First gear 230 Second gear 240 Engagement part 250 Engaged portion 260 Centrifugal clutch device

Claims

1. When a vehicle collision is detected, a pretensioner retracts the shoulder webbing of the seat belt device, A guide device having an insertion portion through which the shoulder webbing of the seat belt device is inserted, and configured to be slidable in the vehicle width direction, A locking mechanism is configured to allow the guide device to slide under normal conditions, and to restrict the sliding of the guide device when the pretensioner is activated. Equipped with, The locking mechanism has a roller provided on the lower side of the insertion portion of the guide device that is on the outer side in the vehicle width direction, A vehicle in which, when the shoulder webbing of the seat belt device is retracted by the operation of the pretensioner, the roller of the locking mechanism is pressed downward by the shoulder webbing of the seat belt device, and in conjunction with the rotation of the roller of the locking mechanism as the shoulder webbing of the seat belt device moves, the locking mechanism starts to restrict the sliding of the guide device.

2. The locking mechanism is A first gear is provided on the outer circumference of the roller, A second gear is provided below the first gear so as to mesh with the first gear, An engaging portion configured to be movable in accordance with the rotation of the second gear, The engaged portion is positioned opposite the engagement portion, It further possesses, The vehicle according to claim 1, wherein the engaging portion moves toward the engaged portion in accordance with the rotation of the second gear and engages with the engaged portion, thereby restricting the sliding of the guide device.

3. The locking mechanism is The vehicle according to claim 2, further comprising a centrifugal clutch device provided inside the first gear, configured to not transmit the rotation of the roller to the first gear when the rotational speed of the roller is less than a predetermined speed, and to transmit the rotation of the roller to the first gear when the rotational speed of the roller is equal to or greater than the predetermined speed.

4. The vehicle according to claim 1 or 2, wherein the roller has a rotation axis that is inclined downward from the outside in the vehicle width direction toward the inside in the vehicle width direction.

5. The vehicle according to claim 4, wherein the roller is composed of a tapered guide roller that is rotatably mounted around the rotation axis, and the roller is positioned at the lower corner portion on the outer side in the vehicle width direction of the insertion portion.

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