Seat belt retractor

Abstract

A seat belt retractor, comprising a frame (100), a reel (200), and a pre-tightening device. The reel (200) is rotatably mounted on the frame (100); the pre-tightening device comprises a driving wheel (310), a tube (330), and a plurality of mass bodies (340); the driving wheel (310) is connected to the reel (200); the tube (330) is used for accommodating the plurality of mass bodies (340); and an engagement area (350) is formed between the tube (330) and the driving wheel (310). The seat belt retractor further comprises a guide device (400); the guide device (400) comprises a base (410), a guide rod (420), and an elastic member (430); the base (410) is fixed on the frame (100); the guide rod (420) is slidably connected to the base (410), and can slide relative to the base (410) between a first position and a second position; the elastic member (430) is separately connected to the base (410) and the guide rod (420), and is used for providing, to the guide rod (420), an elastic force for enabling the guide rod (420) to slide towards the first position; and when the guide rod (420) is at the first position, the guide rod (420) is at least partially located in the engagement area (350). By means of the guide device, the seat belt retractor can reduce a force required for re-synchronizing the mass bodies (340) and the driving wheel (310) during secondary engagement, thereby preventing the driving wheel (310) from being stuck.

Description

Seat belt retractor Technical Field

[0001] The present disclosure relates to the technical field of vehicle safety belts, and more particularly to a safety belt retractor. Background Art

[0002] Vehicle seat belts are an important part of the vehicle occupant restraint system. They include a retractor and a webbing. The webbing is wound around the reel of the retractor to achieve webbing retraction. In the event of a traffic accident, the seat belt can provide protection for the vehicle occupants, preventing them from being injured or minimizing the injury.

[0003] Existing seatbelt retractors have a pretensioner and a force-limiting device. When a vehicle collides, the pretensioner engages the drive wheel by driving a certain number of masses, causing the drive wheel and the reel connected to the drive wheel to rotate in the retraction direction. This pretensioner tightens the webbing, effectively fitting the occupant's body and improving protection. After a collision, the occupant moves forward due to inertia, causing the webbing to be pulled outward. When this force exceeds a predetermined threshold, the force-limiting device rotates the reel in the opposite direction of the retraction, loosening the webbing and pulling it out. This prevents the webbing from applying excessive restraining force to the occupant's body and causing secondary injury. After the force-limiting function is activated, some masses disengage from the drive wheel, but can still reengage with the drive wheel when the drive wheel rotates in the opposite direction of the retraction direction and be pulled back by the drive wheel. This is called "secondary engagement."

[0004] Due to the influence of different seat belt wearing operations and manufacturing tolerances, the relative position of the mass body and the drive wheel will fluctuate, causing the force required to synchronize the mass body and the drive wheel to fluctuate. When the force is large enough, the drive wheel may be stuck, preventing it from continuing to rotate, thereby preventing the webbing from being pulled out, blocking the force limiting function and causing injury to the occupant. Summary of the Invention

[0005] The present disclosure aims to provide a seat belt retractor to reduce the force required for resynchronization of a mass body and a drive wheel during secondary engagement, thereby preventing the drive wheel from being stuck.

[0006] Based on the above-mentioned purpose, the present disclosure provides a seat belt retractor, including a frame, a reel and a pre-tensioning device, the reel being rotatably mounted on the frame, the pre-tensioning device including a driving wheel, a tube and a plurality of mass bodies, the driving wheel being connected to the reel, the tube being used to accommodate the plurality of mass bodies, and an engaging area being formed between the tube and the driving wheel, characterized in that it also includes a guiding device, the guiding device including a base, a guide rod and an elastic member, the base being fixed on the frame, the guide rod being slidably connected to the base and being able to slide between a first position and a second position relative to the base, the elastic member being respectively connected to the base and the guide rod, for providing an elastic force to the guide rod to cause the guide rod to slide toward the first position; when the guide rod is in the first position, the guide rod is at least partially located in the engaging area.

[0007] In some embodiments, when the mass body drives the driving wheel to rotate in a first direction, the guide rod can reach or be located at the second position, so that the mass body disengages from the driving wheel and enters the storage channel; when the driving wheel changes from rotating in the first direction to rotating in a second direction opposite to the first direction, the guide rod can reach or be located at the first position to push the mass body, especially the mass body in the engagement area, to re-engage with the driving wheel or to prevent the mass body, especially the mass body in the storage channel, from re-engaging with the driving wheel. In the present disclosure, "can reach or be located" means that the guide rod can basically reach or be located at the first position or the second position respectively. When the guide rod is in the second position, the mass body basically pushes the guide rod open to the maximum extent.

[0008] In some embodiments, a slide groove is provided on the base, the guide rod is at least partially located in the slide groove and can slide in the slide groove; the elastic member is located in the slide groove.

[0009] In some embodiments, two ends of the elastic member are in contact with the guide rod and the base respectively and are in a compressed state.

[0010] In some embodiments, the base is composed of a first part and a second part that are detachably assembled together.

[0011] In some embodiments, the guide rod includes a rod head and a rod body, the rod body is located in the sliding groove and can slide in the sliding groove, and the rod head is located outside the sliding groove.

[0012] In some embodiments, a first limiting structure is provided on the rod body, and a second limiting structure is provided on the base. The first limiting structure and the second limiting structure limit each other to define the first position.

[0013] In some embodiments, the rod head is provided with a third limiting structure, and the base is provided with a fourth limiting structure. The third and fourth limiting structures mutually limit each other to define the second position. Here, "limiting the second position" is understood to mean limiting the second position to a certain extent. In practice, the second position can be expressed in various degrees, and the third and fourth limiting structures can work together to limit the second position to a certain extent.

[0014] In some embodiments, the slide groove extends into an arc shape, and the slide groove is parallel to the circumference of the driving wheel.

[0015] In some embodiments, the guide rod includes a first side wall, a bottom wall, and a second side wall, wherein the first side wall and the bottom wall are smoothly connected, and the bottom wall is inclined downward. The bottom wall is used to push the mass body in contact with the bottom wall back to the engagement area to re-engage with the drive wheel when the drive wheel rotates in the second direction, and the second side wall is used to prevent the mass body that is disengaged from the drive wheel from returning to the engagement area and re-engaging with the drive wheel.

[0016] In the seat belt retractor disclosed in the present invention, when the mass body causes the driving wheel to rotate in a first direction, the guide rod can be moved from the first position to the second position, and the guide rod guides the mass body that is disengaged from the driving wheel to enter the storage channel. When the driving wheel rotates in a second direction, the guide rod returns to the first position under the action of elastic force, which can push the mass body in contact with its bottom wall to move back and engage with the driving wheel, reducing the force required for the mass body to engage synchronously with the driving wheel, preventing the driving wheel from being stuck, and at the same time the guide rod can prevent the mass body in the storage channel from re-entering the engagement area, reducing the probability of secondary engagement. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] FIG1 is a schematic structural diagram of a seat belt retractor according to an embodiment of the present disclosure;

[0018] FIG2 is a side cross-sectional view of a seat belt retractor according to an embodiment of the present disclosure, wherein the pretensioning device has not yet been activated;

[0019] FIG3 is a side cross-sectional view of a seat belt retractor according to an embodiment of the present disclosure, wherein the pretensioning device is activated and the mass body is engaged with the drive wheel and causes the drive wheel to rotate in a first direction;

[0020] 4 is a side cross-sectional view of the seat belt retractor according to the disclosed embodiment, wherein the driving wheel rotates in the second direction under the tension of the webbing;

[0021] FIG5 is an exploded view of a guide device according to an embodiment of the present disclosure;

[0022] FIG6 is a half-section view of FIG5;

[0023] FIG7 is a schematic structural diagram of a guiding device for providing an AA cutting direction according to an embodiment of the present disclosure;

[0024] FIG8 is a cross-sectional view taken along line AA of FIG7 . DETAILED DESCRIPTION

[0025] Some embodiments of the present disclosure are given below in conjunction with the accompanying drawings and described in detail.

[0026] As shown in Figures 1 and 2, an embodiment of the present disclosure provides a seat belt retractor, including a frame 100, a reel 200 and a pre-tensioning device. The reel 200 is rotatably mounted on the frame 100 and can rotate around its own axis relative to the frame 100. The webbing (not shown in the figures) is wound around the reel 200. When the reel 200 rotates in a first direction (i.e., the reeling direction), the webbing can be tightened and reeled on the reel 200. When the reel 200 rotates in a second direction (i.e., the direction opposite to the reeling direction), the webbing can be loosened and thus pulled out from the reel 200. A winding spring (not shown in the figures) is usually provided on the reel 200 for providing a pre-tensioning force to rotate the reel 200 in the reeling direction. The pre-tightening device includes a driving wheel 310, a trigger mechanism 320, a tube 330 and a plurality of mass bodies 340 (e.g., spheres made of metal or plastic). The driving wheel 310 is connected to the reel 200 and can rotate synchronously with the reel 200. The tube 330 is used to accommodate the plurality of mass bodies 340. When the pre-tightening device is not working, the mass bodies 340 remain stationary in the tube 330. When the vehicle collides, the trigger mechanism 320 is triggered and drives at least part of the mass bodies 340 to move along the tube 330, so that the pre-tightening device 310 is not working. The meshing area 350 engages with the drive wheel 310, causing the drive wheel 310 to rotate in a first direction. Simultaneously, the drive wheel 310 rotates with the reel 200 in the first direction, thereby pre-tightening the webbing. As the drive wheel 310 rotates in the first direction, the mass body 340 disengages from the drive wheel 310 and enters the storage channel 360. Since there are multiple mass bodies 340, each of the mass bodies 340 sequentially engages with the drive wheel 310 and then disengages, allowing the drive wheel 310 to continue rotating. After a collision, the occupant moves forward due to inertia, causing the webbing to be pulled outward. This force causes the reel 200 and drive wheel 310 to rotate in a second direction, which in turn offsets the pre-tightening force of the pre-tightening device, slowing the tightening of the webbing. When this force exceeds the pre-tightening force of the pre-tightening device, the drive wheel 310 rotates in the second direction, and the webbing is no longer tightened but pulled outward. Due to the influence of different seat belt wearing operations in actual use, the angular position of the drive wheel 310 fluctuates randomly each time the pre-tensioning is started. At the same time, affected by manufacturing tolerances, its pre-tensioning stroke also fluctuates randomly. That is, after the pre-tensioning function is started, the rotation angle of the reel 200 and the drive wheel 310 fluctuates, which makes the position of the mass body 340 and the drive wheel 310 fluctuate when the secondary engagement occurs. If a mass body 340 that is disengaged from the drive wheel 310 contacts the tip of the drive wheel 310 (such as the tooth tip) when the drive wheel 310 rotates in the opposite direction (i.e., in the second direction), it may cause the drive wheel 310 to get stuck and unable to continue to rotate in the second direction. In this way, the webbing will not be able to be pulled out any further. When the force between the webbing and the occupant is too large, the occupant will be injured by the webbing.

[0027] To solve the above-mentioned problem, the seat belt retractor of the embodiment of the present disclosure also includes a guiding device 400, which is fixed on the frame 100 and is used to push the mass body 340 that has disengaged from the drive wheel 310 to re-engage with the drive wheel 310 when the drive wheel 310 rotates in the second direction, thereby reducing the force required for the mass body 340 to re-engage with the drive wheel 310, or to prevent the mass body 340 from re-engaging with the drive wheel 310, thereby reducing the probability of secondary engagement; thereby preventing the drive wheel 310 from being stuck.

[0028] As shown in Figures 3 and 4, the guiding device 400 includes a base 410, a guide rod 420 and an elastic member 430. The base 410 is fixed on the frame 100. The guide rod 420 is slidably connected to the base 410 and can slide between a first position and a second position relative to the base 410. The elastic member 430 is connected to the base 410 and the guide rod 420 respectively, and is used to provide an elastic force to the guide rod 420 to make the guide rod 420 slide toward the first position, so that the guide rod 420 remains in the first position when not subjected to external force; as shown in Figure 2, when the vehicle does not collide, the preload device is not activated, and each mass body 340 is stationary in the tube 330. The guide rod 420 remains in the first position under the action of the elastic force. At this time, the guide rod 420 is at least partially located in the meshing area 350 and is within the rotation radius of the drive wheel 310. When the vehicle collides, as shown in FIG3 , the mass body 340 is pushed into the meshing area 350 by the action of the trigger mechanism 320 and meshes with the drive wheel 310, and causes the drive wheel 310 to rotate in the first direction to achieve pre-tightening of the webbing. Since the guide rod 420 is initially located in the meshing area 350, the mass body 340 pushes the guide rod 420 to slide toward the second position and remains in the second position during the pre-tightening process. When the tension of the webbing is greater than the pre-tightening force of the pre-tightening device, the drive wheel 310 rotates in the second direction, as shown in FIG4 . At this time, the guide rod 420 is no longer pushed by the mass body 340, so under the elastic force Under the action, the guide rod 420 will slide toward the first position and eventually remain in the first position. In the process of the guide rod 420 sliding toward the first position, the mass body 340 can be pushed to move back, thereby prompting the mass body 340 in the meshing area 350 to re-engage with the drive wheel 310, reducing the force required for synchronization between the two, and preventing the drive wheel 310 from being stuck; and when the guide rod 420 remains in the first position, the guide rod 420 can isolate the meshing area 350 and the storage channel 360 to prevent the mass body 340 in the storage channel 360 from returning to the meshing area 350 and re-engaging with the drive wheel 310, thereby preventing the drive wheel 310 from being stuck.

[0029] In some embodiments, the elastic member 430 may be a spring, a spring, or any other suitable elastic element.

[0030] As shown in Figures 5 and 6, a sliding groove 411 is provided on the base 410, and the guide rod 420 can be at least partially inserted into the sliding groove 411 and slide in the sliding groove 411. The elastic member 430 is located in the sliding groove 411 and is in a compressed state (the two ends of the elastic member 430 are respectively in contact with the guide rod 420 and the top wall of the sliding groove of the base 410), thereby providing an elastic force to the guide rod 420 to make it slide toward the first position.

[0031] In some embodiments, the slide groove 411 has a restraining effect on the guide rod 420 in directions other than the circumferential motion direction, thereby effectively preventing the guide rod from tilting during movement and causing the guiding function to fail.

[0032] In some embodiments, the base 410 can be formed by a first part 412 and a second part 413 that are detachably assembled together. A groove is provided on each of the first part 412 and the second part 413. The two grooves are assembled together to form a slide groove 411, which makes the base 410 easier to assemble and disassemble.

[0033] In some embodiments, the guide rod 420 may include a rod head 421 and a rod body 422. The rod body 422 is inserted into the slide groove 411 and can slide in the slide groove 411, and the rod head 421 is located outside the slide groove 411. When the guide rod 420 is in the first position, the rod head 421 is located in the engagement area 350.

[0034] As shown in Figures 5, 6, and 8, in some embodiments, a first limiting structure 423 may be provided on the rod body 422, and a second limiting structure 414 may be provided on the base 410. When the guide rod 420 slides to the first position, the first limiting structure 423 and the second limiting structure 414 limit each other, thereby restricting the guide rod 420 to the first position and preventing it from sliding. For example, the first limiting structure 423 may be a protrusion at the end of the rod body 422, and the second limiting structure 414 may be a step within the slide groove 411. In the first position, the protrusion and the step interfere with each other, thereby restricting further sliding of the guide rod 420.

[0035] In some embodiments, a third limiting structure 4211 is provided on the rod head 421, and a fourth limiting structure 415 is provided on the base 410. The third limiting structure 4211 and the fourth limiting structure 415 limit each other, thereby limiting the guide rod 420 to the second position. For example, the third limiting structure 4211 can be a top wall of the rod head 421, and the fourth limiting structure 415 can be a limiting wall on the base 410. When the guide rod 420 slides from the first position to the second position, the top wall of the rod head 421 contacts the limiting wall of the base 410 to prevent the guide rod 420 from sliding further, thereby stopping the guide rod 420 in the second position.

[0036] In some embodiments, the sliding direction of the guide rod 420 can be parallel to the circumference of the drive wheel 310, so that the sliding path of the guide rod 420 is an arc. Specifically, the slide groove 411 can extend into an arc shape, and the slide groove 411 is parallel to the circumference of the drive wheel 310, so that the sliding direction of the guide rod 420 is parallel to the circumference of the drive wheel 310.

[0037] As shown in FIG6 , in some embodiments, the guide rod 420 includes a first side wall 424, a bottom wall 425, and a second side wall 426. The first side wall 424 and the bottom wall 425 are smoothly connected, and the bottom wall 425 is inclined downward. After the pre-tightening is started, the mass body 340 contacts the smooth connection portion between the first side wall 424 and the bottom wall 425 of the guide rod 420 and pushes the guide rod 420 to slide toward the second position. Then, the mass body 340 moves along the bottom wall 425 and enters the storage channel 360. When the webbing is As the pulling force gradually increases, the guide rod 420 will slide back to the first position from the second position. At this time, the mass body 340 in contact with the bottom wall 425 will be pushed back to the meshing area 350 by the guide rod 420 to re-engage with the drive wheel 310, reducing the force required for it to re-engage with the drive wheel 310 and preventing the drive wheel 310 from getting stuck; when the guide rod 420 is maintained in the first position, the second side wall 426 acts as a blocking surface to prevent the mass body 340 in the storage channel 360 from returning to the meshing area 350.

[0038] As shown in FIG1 , in some embodiments, the seat belt retractor further includes a cover plate 500 , which is fixedly connected to the frame 100 and covers the pre-tensioning device for protection. The storage channel 360 may be defined by the cover plate 500 and the frame 100 .

[0039] In some embodiments, the trigger mechanism can be located at the end of the tube 330, which includes a gas generator and a piston. When the vehicle collides or is about to collide, the collision signal can be identified by the sensor, and then a trigger signal is generated by the collision signal to trigger the gas generator to explode. The high-pressure gas generated by the explosion acts on the mass body 340 in the tube 330 through the piston, causing the mass body 340 to enter the meshing area 350 in turn and engage with the drive wheel 310, thereby achieving pre-tightening.

[0040] In some embodiments, the tube 330 may include a tube body 331 and an extension 332. The tube body 331 is a closed tube, and the extension 332 is a semi-closed tube. The extension 332 is located below the driving wheel 310, and an engagement area 350 is formed between the extension 332 and the driving wheel 310. A detachable blocking member (not shown in the figure) may be installed at the outlet of the tube body 331. When the trigger mechanism 320 is not triggered, each mass body 340 is stored in the tube body 331, and the blocking member prevents the mass body 340 from entering the engagement area 350. When the trigger mechanism 320 is triggered, it pushes the mass body 340 to break through the obstruction of the blocking member and enter the engagement area 350 in turn to engage with the driving wheel 310.

[0041] In some embodiments, the driving wheel 310 may be a gear having a plurality of teeth, with a tooth groove formed between any two adjacent teeth. The mass body 340 may be accommodated in the tooth groove to achieve meshing with the driving wheel 310 .

[0042] In the seat belt retractor of the disclosed embodiment, the guide rod 420 of the guide device 400 can slide between a first position and a second position. When the mass body 340 causes the drive wheel 310 to rotate in the first direction, the guide rod 420 can move from the first position to the second position, and the guide rod 420 guides the mass body 340 that is disengaged from the drive wheel 310 to enter the storage channel 360. When the drive wheel 310 rotates in the second direction, the guide rod 420 returns to the first position under the action of elastic force, and can push the mass body 340 that is in contact with its bottom wall 425 to move back and engage with the drive wheel 310, thereby reducing the force required for the mass body 340 to engage synchronously with the drive wheel 310 and prevent the drive wheel 310 from being stuck. At the same time, the guide rod 420 can prevent the mass body 340 in the storage channel 360 from re-entering the engagement area, thereby reducing the probability of secondary engagement.

[0043] It should be noted that the present disclosure (e.g., the disclosed concepts, etc.) has been described in the specification of this patent document and / or illustrated in the drawings based on exemplary embodiments; the embodiments of the present disclosure are presented only by way of example and are not intended to limit the scope of the present disclosure. The structure and / or arrangement of the elements of the disclosed concepts embodied in the present disclosure as described in the specification and / or illustrated in the drawings is illustrative only. Although exemplary embodiments of the present disclosure have been described in detail in this patent document, it is readily understood by those skilled in the art that equivalents, modifications, variations, etc. of the subject matter of the exemplary embodiments and alternative embodiments are possible and are considered to be within the scope of the present disclosure; all such subject matters (e.g., modifications, variations, embodiments, combinations, equivalents, etc.) are intended to be included within the scope of the present disclosure. It should also be noted that various / other modifications, changes, substitutions, equivalents, alterations, omissions, etc. may be made in the configuration and / or arrangement of the exemplary embodiments (e.g., in terms of concept, design, structure, device, form, assembly, construction, means, function, system, process / method, step, order of process / method steps, operation, operating conditions, performance, materials, composition, combination, etc.) without departing from the scope of the present disclosure; all such subjects (e.g., modifications, changes, embodiments, combinations, equivalents, etc.) are intended to be included within the scope of the present disclosure. The scope of the present disclosure is not intended to be limited to the subject matter described in the specification and / or drawings of this patent document (e.g., details, structures, functions, materials, acts, steps, orders, systems, results, etc.). Considering that the claims of this patent document will be appropriately interpreted to cover the full scope of the subject matter of the present disclosure (e.g., including any and all such modifications, changes, embodiments, combinations, equivalents, etc.); it should be understood that the terminology used in this patent document is intended to provide a description of the subject matter of the exemplary embodiments and not as a limitation on the scope of the present disclosure.

[0044] It should also be noted that, depending on the exemplary embodiments, the present disclosure may include conventional technologies (e.g., technologies implemented and / or integrated in the exemplary embodiments, modifications, variations, combinations, equivalents), or may include any other applicable technologies (present and / or future) that have the ability to perform the functions and processes / operations described in the specification and / or illustrated in the figures. All such technologies (e.g., technologies implemented in embodiments, modifications, variations, combinations, equivalents, etc.) are considered to be within the scope of the present disclosure of this patent document.

Claims

1. A seat belt retractor comprising a frame, a reel, and a pre-tensioning device, wherein the reel is rotatably mounted on the frame, the pre-tensioning device comprising a drive wheel, a tube, and a plurality of mass bodies, the drive wheel being connected to the reel, the tube being used to accommodate the plurality of mass bodies, and an engagement area being formed between the tube and the drive wheel, characterized in that: It also includes a guiding device, which includes a base, a guide rod and an elastic member. The base is fixed on the frame, the guide rod is slidably connected to the base, and can slide between a first position and a second position relative to the base. The elastic member is respectively connected to the base and the guide rod, and is used to provide an elastic force to the guide rod to make the guide rod slide toward the first position; when the guide rod is in the first position, the guide rod is at least partially located in the engagement area.

2. The seat belt retractor according to claim 1, characterized in that: When the mass body drives the driving wheel to rotate in a first direction, the guide rod can reach the second position, so that the mass body disengages from the driving wheel and enters the storage channel; when the driving wheel changes from rotating in the first direction to rotating in a second direction opposite to the first direction, the guide rod can reach the first position to push the mass body to re-engage with the driving wheel or prevent the mass body from re-engaging with the driving wheel.

3. The seat belt retractor according to claim 1, characterized in that: A slide groove is provided on the base, and the guide rod is at least partially located in the slide groove and can slide in the slide groove; the elastic member is located in the slide groove.

4. The seat belt retractor according to claim 3, characterized in that: Two ends of the elastic member are in contact with the guide rod and the base respectively and are in a compressed state.

5. The seat belt retractor according to claim 1, characterized in that: The base is composed of a first part and a second part which are detachably assembled with each other.

6. The seat belt retractor according to claim 3, characterized in that: The guide rod comprises a rod head and a rod body, the rod body is located in the sliding groove and can slide in the sliding groove, and the rod head is located outside the sliding groove.

7. The seat belt retractor according to claim 6, characterized in that: A first limiting structure is provided on the rod body, and a second limiting structure is provided on the base. The first limiting structure and the second limiting structure limit each other to define the first position.

8. The seat belt retractor according to claim 6, characterized in that: The rod head is provided with a third limiting structure, and the base is provided with a fourth limiting structure. The third limiting structure and the fourth limiting structure limit each other to define the second position.

9. The seat belt retractor according to claim 3, characterized in that: The slide groove extends in an arc shape, and the slide groove is parallel to the circumference of the driving wheel.

10. The seat belt retractor according to claim 1, wherein: The guide rod includes a first side wall, a bottom wall and a second side wall. The first side wall and the bottom wall are smoothly connected, and the bottom wall is inclined downward. The bottom wall is used to push the mass body in contact with the bottom wall back to the engagement area to re-engage with the drive wheel when the drive wheel rotates in the second direction. The second side wall is used to prevent the mass body that is disengaged from the drive wheel from returning to the engagement area and re-engaging with the drive wheel.

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