Safety belt retractor, safety belt assembly and vehicle

Abstract

The utility model discloses a safety belt retractor, a safety belt assembly and a vehicle. The safety belt retractor comprises a reel and a coil spring shell, the reel comprises a first reel part, a containing groove is formed in the coil spring shell, at least part of the first reel part is located in the containing groove, the containing groove is provided with a side wall face and a bottom wall face which are connected with each other, and the radial size of the portion, at the joint of the side wall face and the bottom wall face, of the containing groove is larger than that of the first reel part. The radial size of the bottom wall face is gradually reduced in the direction away from the first reel part, the first reel part abuts against the bottom wall face, and the bottom wall face is used for limiting the first reel part in the radial direction. Through the implementation mode, the first reel part can rotate in the containing groove, and the abutting position of the first reel part and the bottom wall surface is spaced from the connecting position of the side wall surface and the bottom wall surface, so that the bottom wall surface can clamp the first reel part in the radial direction, and the first reel part is prevented from moving in the radial direction to impact the side wall surface; therefore, noise generated by the safety belt retractor is reduced.

Description

Technical Field

[0001] The present application relates to the field of automotive technology, and in particular to a seat belt retractor, a seat belt assembly and a vehicle. Background Art

[0002] Seat belts can effectively restrain the body movement of drivers and passengers and effectively protect their safety. The retractor is the core component of the seat belt assembly. It can partially or completely retract the seat belt. It can provide restraint force to the seat belt and fix the driver and passengers on the seat.

[0003] The reel inside the reel can reel in or unreel the seat belt by rotating forward or reverse. When the reel is rotating or when the vehicle is vibrating, the reel is prone to shaking and the reel is prone to making noise, which greatly affects the NVH (noise, vibration and harshness) performance of the vehicle. Therefore, the reel structure needs to be improved to reduce the noise generated. Utility Model Content

[0004] The main purpose of this application is to provide a seat belt retractor, a seat belt assembly and a vehicle, aiming to solve the above-mentioned technical problems existing in the prior art.

[0005] To solve the above problems, the present application provides a seat belt retractor, which includes a reel and a spring housing, the reel including a first reel portion, the spring housing forming a receiving groove, the first reel portion being at least partially located in the receiving groove, the receiving groove having side walls and a bottom wall surface connected to each other, the radial dimension of the receiving groove at the connection between the side walls and the bottom wall surface being larger than the radial dimension of the first reel portion, the radial dimension of the bottom wall surface gradually decreasing in the direction away from the first reel portion, the first reel portion abutting against the bottom wall surface, and the bottom wall surface being used to limit the first reel portion in the radial direction.

[0006] Furthermore, the first reel portion includes a first reel main body portion and a reel end portion connected to each other, the first reel main body portion is spaced apart from the side wall surface, the reel end portion is arc-shaped, and the reel end portion abuts against the bottom wall surface.

[0007] Furthermore, the radial dimension of the reel end portion gradually decreases in a direction away from the first reel main body portion.

[0008] Furthermore, a middle area of ​​the end portion of the reel is spaced apart from a middle area of ​​the bottom wall, and an edge area of ​​the end portion of the reel is in contact with an edge area of ​​the bottom wall.

[0009] Furthermore, a line connecting the center of the bottom wall surface and the center of the end portion of the reel is parallel to the central axis of the first reel main body.

[0010] Furthermore, the coil spring housing includes a connected coil spring portion and a core shaft portion, the coil spring portion and the core shaft portion are coaxially arranged, the coil spring portion is spaced from the core shaft portion in the radial direction of the first coil shaft portion, part of the core shaft portion is located in the coil spring cavity formed by the coil spring portion, and the core shaft portion forms the accommodating groove.

[0011] Furthermore, the reel includes a second reel portion, the second reel portion is adjacent to the core shaft portion, the second reel portion is connected to the first reel portion, and a portion of the second reel portion is located in the coil spring cavity.

[0012] Furthermore, a radial dimension of the second scroll portion is greater than a radial dimension of the first scroll portion, and the second scroll portion and the first scroll portion are coaxial.

[0013] To solve the above problems, the present application also provides a seat belt assembly, which includes a seat belt and the above-mentioned seat belt retractor, and the seat belt is connected to the seat belt retractor.

[0014] To solve the above problems, the present application also provides a vehicle, which includes the above-mentioned seat belt assembly.

[0015] Compared to the prior art, the seatbelt retractor of the present invention includes a reel and a coil spring housing, the reel including a first reel portion, the coil spring housing forming a receiving groove, the first reel portion being at least partially located within the receiving groove, the receiving groove having a side wall surface and a bottom wall surface connected to each other, the radial dimension of the receiving groove at the junction of the side wall surface and the bottom wall surface being larger than the radial dimension of the first reel portion, the radial dimension of the bottom wall surface gradually decreasing in a direction away from the first reel portion, the first reel portion abutting the bottom wall surface, the bottom wall surface being used to limit the first reel portion in the radial direction. Through the above embodiment, the first reel portion can rotate within the receiving groove, and because the radial dimension of the receiving groove at the junction of the side wall surface and the bottom wall surface is larger than the radial dimension of the first reel portion, the abutment position of the first reel portion and the bottom wall surface is spaced apart from the junction position of the side wall surface and the bottom wall surface, so that the bottom wall surface can radially clamp the first reel portion, preventing the first reel portion from radially moving and striking the side wall surface, thereby reducing noise generated by the seatbelt retractor. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 It is a structural schematic diagram of the seat belt retractor provided by this application;

[0018] Figure 2 yes Figure 1 The schematic diagram of the partial structure of the seat belt retractor shown;

[0019] Figure 3 yes Figure 2 Schematic diagram of the partially enlarged structure in the dotted box.

[0020] Reference numerals: seat belt retractor 1; reel 10; first reel portion 110; first reel main body 111; reel end 112; second reel portion 120; coil spring housing 20; accommodating groove 210; side wall surface 211; bottom wall surface 212; core shaft portion 220; coil spring portion 230; central axis O. DETAILED DESCRIPTION

[0021] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0023] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0024] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0025] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0026] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0027] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0028] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0029] The reel inside the reel can reel in or unreel the seat belt by rotating forward or reverse. When the reel is rotating or when the vehicle is vibrating, the reel is prone to shaking and the reel is prone to making noise, which greatly affects the NVH (noise, vibration and harshness) performance of the vehicle. Therefore, the reel structure needs to be improved to reduce the noise generated.

[0030] In order to solve the related technical problems, the present application provides a seat belt retractor, see Figures 1 to 3 , Figure 1 This is a structural diagram of the seat belt retractor provided in this application. Figure 2 yes Figure 1 The schematic diagram of the partial structure of the seat belt retractor is shown in FIG. Figure 3 yes Figure 2 Schematic diagram of the partially enlarged structure in the dotted box.

[0031] The seat belt retractor 1 includes a reel 10 and a spring housing 20. The reel 10 includes a first reel portion 110. The spring housing 20 is formed with a receiving groove 210. The first reel portion 110 is at least partially located in the receiving groove 210. The receiving groove 210 has a side wall surface 211 and a bottom wall surface 212 that are connected to each other. The radial dimension of the receiving groove 210 at the connection between the side wall surface 211 and the bottom wall surface 212 is larger than the radial dimension of the first reel portion 110. The radial dimension of the bottom wall surface 212 gradually decreases in the direction away from the first reel portion 110. The first reel portion 110 abuts against the bottom wall surface 212. The bottom wall surface 212 is used to limit the first reel portion 110 in the radial direction.

[0032] The first reel portion 110 can rotate in the receiving groove 210. The reel 10 is arranged inside the seat belt retractor 1. The other end of the reel 10 opposite to the first reel portion 110 is located in a similar groove body. The receiving groove 210 provides a fulcrum for the reel 10. The radial dimension of the bottom wall surface 212 gradually decreases in the direction away from the first reel portion 110, that is, the bottom wall surface 212 and the first reel portion 110 are inclined at an angle. The bottom wall surface 212 is recessed in the direction away from the first reel portion 110 to form a bottom wall groove. The bottom wall groove constitutes a part of the receiving groove 210 because the side wall surface 211 and The radial dimension of the accommodating groove 210 at the connection of the bottom wall surface 212 is larger than the radial dimension of the first scroll part 110, that is, the maximum diameter of the bottom groove is larger than the diameter of the first scroll part 110, so the first scroll part 110 will extend into the bottom wall groove and abut against the bottom wall surface 212, so the abutment position of the first scroll part 110 and the bottom wall surface 212 is spaced from the connection position of the side wall surface 211 and the bottom wall surface 212, so that the bottom wall surface 212 can clamp the first scroll part 110 in the radial direction to prevent the first scroll part 110 from moving in the radial direction and hitting the side wall surface 211, thereby reducing the noise generated by the reel. It should be noted that the coil spring housing 20 is part of the entire seat belt retractor 1 housing. The seat belt retractor 1 housing forms an internal cavity, and the reel 10 is accommodated in the internal cavity. Both ends of the reel 10 are in contact with the housing, so the reel 10 always abuts against the coil spring housing 20 in the axial direction, and the first reel portion 110 will not move in the axial direction. The first reel portion 110 will not move toward the connection between the side wall surface 211 and the bottom wall surface 212, so that the bottom wall surface 212 cannot clamp the first reel portion 110.

[0033] The first reel portion 110 includes a first reel body portion 111 and a reel end portion 112 connected to each other. The first reel body portion 111 is spaced apart from the side wall surface 211. The reel end portion 112 is arc-shaped and abuts against the bottom wall surface 212. The side wall surface 211 extends in the axial direction of the first reel portion 110, and the radial dimension of the side wall surface 211 is the same as the radial dimension of the connection between the bottom wall surface 212 and the side wall surface 211. This separates the first reel body portion 111 and the side wall surface 211, preventing contact between the first reel portion 110 and the side wall surface 211, thereby reducing friction on the first reel portion 110 and facilitating rotation of the first reel portion 110. In order to make the first scroll part 110 rotate better, preferably, the scroll end 112 is set to an arc shape, so that the contact between the scroll end 112 and the bottom wall surface 212 is surface-to-surface contact, the contact area between the scroll end 112 and the bottom wall surface 212 is increased, and the local pressure on the scroll end 112 is reduced when the bottom wall surface 212 at an angle to the first scroll part 110 is clamped with the scroll end 112, so that the friction force on the first scroll part 110 is smaller, making the first scroll part 110 easier to rotate; of course, the scroll end 112 can also be set to a straight line, and the bottom wall surface 212 can still clamp the first scroll part 110, but the contact between the scroll end 112 and the bottom wall surface 212 will become line-surface contact, which will increase the friction force on the first scroll part 110 when it rotates.

[0034] The radial dimension of the scroll end 112 gradually decreases in the direction away from the first scroll body 111, that is, the scroll end 112 protrudes from the first scroll body 111, so that the scroll end 112 can better cooperate with the bottom wall surface 212. The arc-shaped surface of the raised scroll end 112 is convenient for cooperating with the inclined bottom wall surface 212 to form surface-to-surface contact, so that the bottom wall surface 212 can clamp the first scroll part 110 while reducing the friction force on the first scroll part 110.

[0035] The middle area of ​​the scroll end 112 and the middle area of ​​the bottom wall 212 are spaced apart, and the edge area of ​​the scroll end 112 and the edge area of ​​the bottom wall 212 are in contact with each other, avoiding the complete contact between the scroll end 112 and the bottom wall 212. Instead, the friction between the scroll end 112 and the bottom wall 212 is increased, so that the edge area in the radial direction of the scroll end 112 can form a certain surface contact with the bottom wall 212. The area of ​​the edge area of ​​the surface contact between the scroll end 112 and the bottom wall 212 cannot be too large, otherwise the scroll end 112 will have a greater friction than when the scroll end 112 and the bottom wall 212 are in line-surface contact due to the increase in contact area. That is, the scroll end 112 and the bottom wall 212 are set to be partially in contact and partially spaced.

[0036] The line between the center of the bottom wall 212 and the center of the scroll end 112 is parallel to the center axis O of the first scroll body 111, that is, the scroll end 112 and the bottom wall 212 are arranged in the axial direction of the first scroll body 111, which can make the scroll end 112 and the first scroll body 111 rotate more smoothly. Preferably, the center of the bottom wall 212 and the scroll end 112 are on the same horizontal line with the center axis O of the first scroll body 111, that is, the scroll end 112 is completely covered and connected to the end of the first scroll body 111 in the axial direction, and the scroll end 112 and the bottom wall 212 are symmetrically distributed with the center axis O of the first scroll body 111, so that the scroll 10 rotates more smoothly; of course, the center of the bottom wall 212 and the scroll end 112 can also be parallel to the center axis O of the first scroll body 111 but not on the same horizontal line, that is, the scroll end 112 is radially It is arranged upward on the end of a portion of the first reel main body 111, and similarly, the bottom wall surface 212 is arranged corresponding to the reel end 112. The remaining ends of the first reel main body 111 that are not connected to the reel end 112 are directly in contact with the coil spring housing 20. The first reel main body 111 can still be clipped together with the reel end 112 and the bottom wall surface 212 so that the first reel main body 111 and the reel 10 are limited in the radial direction. However, because the reel end 112 is located on one side of the central axis O of the first reel main body 111, the first reel part 110 may have the problem of not rotating smoothly.

[0037] The coil spring housing 20 includes a coil spring portion 230 and a core shaft portion 220 connected to each other. The coil spring portion 230 and the core shaft portion 220 are coaxially arranged. The coil spring portion 230 is spaced apart from the core shaft portion 220 in the radial direction of the first reel portion 110. Part of the core shaft portion 220 is located in the coil spring cavity formed by the coil spring portion 230, and the core shaft portion 220 forms a receiving groove 210. The core shaft portion 220 is mainly used to provide a fulcrum for the reel 10 and to limit the reel 10. The coil spring housing 20 has a bottom surface, and the core shaft portion 220 protrudes from the bottom surface of the coil spring housing 20. The coil spring portion 230 surrounds the core shaft portion 220 and protrudes from the bottom surface of the coil spring housing 20 to form a coil spring cavity. The coil spring cavity formed by the coil spring portion 230 is used to accommodate the coil spring of the seat belt retractor 1. The first reel portion 110 is located in the receiving groove 210 formed by the inward depression of the core shaft portion 220. The portion of the reel 10 connected to the first reel portion 110 and the core shaft portion 220 are located in the coil spring cavity formed by the coil spring portion 230. The coil spring is connected to the reel 10 located in the coil spring cavity, so that the rotation of the reel 10 drives the coil spring to rotate and stretch, or the coil spring automatically reels due to elastic force and drives the reel 10 to rotate, thereby realizing the winding or unwinding of the seat belt. The coil spring portion 230 and the core shaft portion 220 are coaxial, which makes it convenient for the coil spring to be evenly wound in the coil spring cavity as the reel 10 rotates.

[0038] The reel 10 includes a second reel portion 120, which is adjacent to the core portion 220 and connected to the first reel portion 110. A portion of the second reel portion 120 is located within the coil spring cavity. The coil spring is connected to the radial surface of the second reel portion 120 located within the coil spring cavity. A certain gap is provided in the axial direction between the second reel portion 120 and the core portion 220 to prevent contact between the second reel portion 120 and the core portion 220, thereby increasing the friction force applied to the reel 10. However, the gap between the second reel portion 120 and the core portion 220 should not be too large, otherwise the coil spring may be drawn into the receiving groove 210, thereby affecting the rotation of the reel 10.

[0039] The radial dimension of the second reel portion 120 is greater than that of the first reel portion 110. The second reel portion 120 and the first reel portion 110 are coaxial, and the radial surface of the second reel portion 120 is spaced apart from the first reel portion 110, thereby keeping the radial surface of the second reel portion 120 away from the receiving groove 210. This prevents the coil spring from entering the receiving groove 210 and affecting the fit between the first reel portion 110 and the side wall surface 211 and the bottom wall surface 212. It should be noted that the radial dimension of the second reel portion 120 is smaller than the radial dimension of the coil spring cavity, so that the coil spring cavity can accommodate the coil spring.

[0040] To sum up, the accommodating groove 210 set in the spring housing 20 provides a fulcrum for the reel 10, and the reel 10 can rotate in the accommodating groove 210. The first reel portion 110 of the reel 10 abuts against the bottom wall surface 212, and the radial dimension of the bottom wall surface 212 gradually decreases in the direction away from the first reel portion 110, and the radial dimension of the connection between the first bottom wall surface 212 and the second bottom wall surface 212 is larger than the radial dimension of the first reel portion 110, so that the bottom wall surface 212 and the first reel portion 110 are set at an angle, and the first bottom wall surface 212 can clamp the reel 10 in the radial direction to prevent the reel 10 from moving in the radial direction. At the same time, the first reel portion 110 and the bottom wall surface 212 are set to be partially in contact to prevent the reel 10 from being subjected to excessive friction and difficult to rotate.

[0041] The present application also provides a seat belt assembly, which includes a seat belt and the above-mentioned seat belt retractor 1. The seat belt is connected to the seat belt retractor 1, and the seat belt is connected to the reel 10 inside the seat belt retractor 1, so that the reel spring of the seat belt retractor 1 drives the reel 10 to rotate due to elastic force, thereby driving the seat belt to rotate to reel the seat belt, or the seat belt is reeled out by external force, and the seat belt drives the reel 10 to rotate to drive the reel spring to reel and stretch.

[0042] The present application also provides a vehicle, which includes the above-mentioned seat belt assembly. A vehicle using the seat belt assembly of the present application can reduce the noise generated by the vehicle.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A seat belt retractor, characterized in that: The seat belt retractor includes a reel and a spring housing, the reel including a first reel portion, the spring housing forming a receiving groove, the first reel portion being at least partially located in the receiving groove, the receiving groove having side walls and a bottom wall surface connected to each other, the radial dimension of the receiving groove at the connection between the side walls and the bottom wall surface being larger than the radial dimension of the first reel portion, the radial dimension of the bottom wall surface gradually decreasing in the direction away from the first reel portion, the first reel portion abutting against the bottom wall surface, and the bottom wall surface being used to limit the first reel portion in the radial direction.

2. The seat belt retractor according to claim 1, characterized in that: The first reel portion includes a first reel main body portion and a reel end portion connected to each other, the first reel main body portion is spaced apart from the side wall surface, the reel end portion is arc-shaped, and the reel end portion abuts against the bottom wall surface.

3. The seat belt retractor according to claim 2, characterized in that: The radial dimension of the reel end portion gradually decreases in a direction away from the first reel main body portion.

4. The seat belt retractor according to claim 2, characterized in that: A middle area of ​​the end portion of the reel is spaced apart from a middle area of ​​the bottom wall surface, and an edge area of ​​the end portion of the reel abuts against an edge area of ​​the bottom wall surface.

5. The seat belt retractor according to claim 2, characterized in that: A line connecting the center of the bottom wall surface and the center of the end portion of the reel is parallel to the central axis of the first reel main body.

6. The seat belt retractor according to claim 1, characterized in that: The coil spring housing includes a connected coil spring portion and a core shaft portion, the coil spring portion and the core shaft portion are coaxially arranged, the coil spring portion is spaced from the core shaft portion in the radial direction of the first coil shaft portion, part of the core shaft portion is located in the coil spring cavity formed by the coil spring portion, and the core shaft portion forms the accommodating groove.

7. The seat belt retractor according to claim 6, characterized in that: The reel includes a second reel portion, the second reel portion is adjacent to the core portion, the second reel portion is connected to the first reel portion, and a portion of the second reel portion is located in the coil spring cavity.

8. The seat belt retractor according to claim 7, characterized in that: The radial dimension of the second scroll portion is greater than that of the first scroll portion, and the second scroll portion and the first scroll portion are coaxial.

9. A seat belt assembly, characterized in that: The seat belt assembly includes a seat belt and the seat belt retractor according to any one of claims 1 to 8, and the seat belt is connected to the seat belt retractor.

10. A vehicle, characterized in that: The vehicle includes the seat belt assembly according to claim 9.

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