1. Field of the Invention
The subject invention generally relates to a seat for a vehicle, and more specifically to the seat having at least one energy absorbing feature.
2. Description of the Related Art
Seats for a vehicle and specifically a back portion of the seat typically must meet structural requirements by having sufficient strength to support repeated loads, which are exerted on the back portion of the seat, or seat back, during a crash event. For example, when a vehicle is hit from behind by another vehicle, a mass of an occupant applies a large force on the seat back over a small time period. To meet these structural requirements, the seat back is generally formed from metal such as steel, aluminum, or magnesium. For example, the seat back made from steel is able to meet the structural requirements by providing sufficient stiffness, strength, and ductility to satisfy the above-mentioned requirements.
Recently, more features and content have been designed into the seat back. As a result, a cost to manufacture the seat back has increased. In order to reduce costs, seat backs previously manufactured from metals are now being manufactured from a polymeric material. The seat backs produced from the polymeric material offer the ability to reduce the number of features and content designed into the seat back and therefore reduce manufacturing and assembly costs. Furthermore, weight reduction is another possible benefit of using polymeric material for the seat back, as well as greater design freedom and reduced profile, giving the vehicle increased interior space. However, the seat back made from the polymeric material must still meet the structural requirements for a crash event. For example, during a rear impact collision, the vehicle is accelerated in a forward direction. This causes the seat back to apply acceleration forces to the occupant over a short period of time. Therefore, the seat backs are typically required to manage the acceleration forces applied to the occupant while not exceeding deformation limits.
A seat supports an occupant of a vehicle. The seat comprises a seating frame member for providing a surface to support the occupant. The seat also comprises a back frame member extending away from the seating frame member. The back frame member has a first side member and a second side member spaced from the first side member. Each of the side members have a proximal end, which is coupled to the seating frame member, and a distal end spaced from the proximate end. A first cross member extends horizontally between the first side member and the second side member with the first cross member spaced from the proximal end of the side members. A second cross member extends horizontally between the first side member and the second side member with the second cross member spaced between the first cross member and the distal end of the side members.
Each of the first and second cross members comprise a thermoplastic material. Additionally, the first and second cross members have a central region flanked on both sides by bent portions with the first and second cross members are folded back upon themselves within the bent portions. The bent portions straighten out when a force above a predetermined value is applied to the first and second cross members. The central region plastically deforms once the bent portions straighten out. The straightening out of the bent portions and the plastic deformation of the central region reduce an impact force transferred from the seat to the occupant caused by the force above the predetermined value. Reducing the impact force experienced by the occupant reduces the likelihood of the occupant sustaining injuries as a result of a collision of the vehicle.
Other advantages of the present invention will be readily appreciated, as the same becomes better understood by reference to the following detailed description, when considered in connection with the accompanying drawings wherein:
Referring to the Figures, wherein like numeral indicate like or corresponding parts throughout the several views, a seat 30 for a vehicle is generally shown. The seat 30 is coupled to the vehicle for supporting an occupant 32 in a standard position within the vehicle. With reference to
The back frame member 36 generally extends vertically away from the seating frame member 34. The back frame member 36 includes a first side member 40 and a second side member 42 each extending generally upwardly from the seating frame member 34. The side members 40, 42 each have a proximal end 44 proximate the seating frame member 34 and a distal end 46 spaced from the seating frame member 34. With reference to
The back frame member 36 may comprise a polymeric material. The polymeric material is typically a thermoplastic material for allowing the side members 40, 42 to be injection molded. For example, the polymeric material of the side members 40, 42 may comprise a polyamide. When employed, the polyamide is selected from the group of nylon 6, nylon 6/6 and combinations thereof. The polyamide may be a fiber reinforced polyamide. An example of a suitable fiber reinforced polyamide is a glass-fiber reinforced polyamide that is commercially available from BASF Corporation under the trade name Ultramid® TG7S PA6. It should be appreciated that the side members 40, 42 may be formed from any type of suitable polymeric material, polyamide or not, reinforced or not, without departing from the nature of the present invention.
As best shown in
Typically, the reinforcing mat 52 comprises a glass-fiber filled polymeric material. It is to be appreciated that the glass-filled polymeric material may be the polymeric material of the back frame member 36 described above. Alternatively, the glass-filled polymeric material may be different from the polymeric material of the back frame member 36. Generally, glass fibers within the glass-filled polymeric material extend along the longitudinal axis 56 of the reinforcing mat 52. However, the plurality of fibers may extend in different directions or may be woven, i.e., interlaced with each other. Typically, the glass fibers are elongated such that stress on the reinforcing mat 52 is transmitted from the glass-filled polymeric material to the glass fibers. Transferring the stress allows the glass fibers to reinforce the glass-filled polymeric material.
The glass-filled polymeric material of the reinforcing mat 52 may be integrated with the glass fibers in a variety of ways. For example, the reinforcing mat 52 may be in the form of a continuous fiber reinforced mat that is preformed and subsequently integrated with the glass-filled polymeric material. An example of a suitable continuous fiber reinforced mat is that which is commercially available from Performance Materials Corporation of Camarillo, Calif. under the trade name Continuous Fiber Reinforced Thermoplastic (CFRT).
With reference to
As best shown in
As shown in
Generally, the first and second cross members 74A, 74B have a rectangular cross-sectional configuration. However, it is to be appreciated that the first and second cross members 74A, 74B may have other cross-sectionals, such as circular. It is also to be appreciated that the first cross member 74A may have a cross-sectional configuration that is different from the cross-sectional configuration of the second cross member 74B.
It is to be appreciated that the cross members may be coupled to the side members by any suitable method. For example, with reference to
With reference to
With reference to
Generally, during a collision event, such as a rear end collision, the occupant 32 sitting in the seat 30 is impacted by the first and second cross members 74A, 74B of the seat 3Q as the vehicle is abruptly accelerated forward. As a result, the occupant 32 applies a collision force to the seat 30 and conversely, the seat 30 applies an impact force, which is related to the collision force, to the occupant 32. However, the impact force can be reduced compared to the collision force by providing an energy absorbing feature to dissipate a portion of the collision force.
As shown in
The first and second cross members 74A, 74B are the energy absorbing feature and deform as the occupant 32 applies the collision force to the back frame member 36. The first and second cross members 74A, 74B are typically spaced from the seating frame member 34 along the side members 40, 42 a suitable distance for allowing the occupant 32 to contact the first and second cross member 74A, 74B during the collision event. As shown in
The plastic deformation of the first and second cross members 74A, 74B reduces the impact force transferred from the seat 30 to the occupant 32 caused by the force above the predetermined value. Generally, the occupant 32 plastically deforms the first and second cross members 74A, 74B during the collision event. Generally, the plastic deformation of the first and second cross members 74A, 74B continues until the collision force is entirely dissipated or the central region 92 of the first and second cross members 74A, 74B completely fail.
The deformation of the first and second cross members 74A, 74B results in a displacement of the occupant 32 from the standard position, shown in
The stiffness of the first and second cross members 74A, 74B is dependent on the cross-sectional thickness of the first and second cross members 74A, 74B. As such, the cross-sectional thickness of the first and second cross members 74A, 74B may be varied as needed to resist deformation under normal loads.
The first and second cross members 74A, 74B may comprise any suitable material meeting the stiffness requirements necessary to resist the normal loads applied to the back frame member 36. The first and second cross members 74A, 74B may comprise a polymeric material, such as a thermoplastic material. It is to be appreciated that the polymeric material of the first and second cross members 74A, 74B may be the same as the polymeric material of the back frame member 36. As such, the first and second cross members 74A, 74B may be integrally formed with the back frame member 36. Alternatively, the polymeric material of the first and second cross members 74A, 7413 may be different from the polymeric material of the back frame member 36. Typically, the polymeric material of the first and second cross members 74A, 74B is selected from the group of nylon 6, nylon 6/6, and combinations thereof.
It is to be appreciated that the first cross member 74A may be horizontally spaced from the second cross member 7413, as shown in
The seat 30 may include other energy absorbing features. For example, as shown in
As shown in
Generally, the impact force experienced by the occupant 32 as a result of the collision force can be minimized with the energy absorbing feature while still satisfying safe displacement requirements for the back frame member 36 of the seat 30. With the energy absorbing feature, the impact force is managed over a longer time period, thereby reducing a peak impact force acting on the occupant 32. With the reduction of the peak impact force, the occupant 32 experiences less injury and the seat 30 also experiences lower stress levels. As a result of the seat 30 experiencing lower stress levels, more optimal designs can be utilized, and the polymeric materials can be used to manage the collision force.
Obviously, many modifications and variations of the present invention are possible in light of the above teachings. The foregoing invention has been described in accordance with the relevant legal standards; thus, the description is exemplary rather than limiting in nature. Variations and modifications to the disclosed embodiment may become apparent to those skilled in the art and do come within the scope of the invention.
This application is the National Stage of International Patent Application No. PCT/US2011/051558, filed on Sep. 14, 2011, which claims priority to and all the advantages of U.S. Provisional Patent Application Ser. No. 61/382,582 filed on Sep. 14, 2010 and incorporated herewith in its entirety.
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/US2011/051558 | 9/14/2011 | WO | 00 | 3/13/2013 |
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WO2012/037222 | 3/22/2012 | WO | A |
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