JP5639233B2 - Car seat - Google Patents

Description

  The present invention relates to an automobile seat comprising a seat frame according to the premise of claim 1 and a back frame that is pivotally connected to the seat frame by a fixture on each side. The invention also relates to a motor vehicle equipped with at least one motor vehicle seat of the above type.

  (Patent Document 1) discloses an automobile seat of the above type comprising a seat frame and an associated back frame that is pivotally connected to the seat frame by side fittings. Here, the connection between the fixture and the seat frame is performed by screw connection. The seat frame is substantially formed from a bottom element, and its leading edge and two side edges are used to form a first oval tube. The oval tube is curved in a U shape and has a cross section facing upward. In general, this embodiment firstly aims to provide an automobile seat that is constructed as simply as structurally as possible, but secondly it is constructed as robust as possible, especially for military vehicles.

  (Patent Literature 2), (Patent Literature 3), and (Patent Literature 4) disclose other automobile seats each including a seat frame and a backrest frame.

  A feature common to all motor vehicle seats known from the prior art is that in each case the backrest frame is screwed to the side fittings, and the side fittings are further connected to the seat frame of the relevant car seat. It is fixed articulated. However, a drawback of the known motor vehicle is that a very unfavorable load, i.e. a torsional load, is applied to the screw connection in the event of a collision due to tensile / compressive stress that must not be underestimated.

German utility model No. 20 2010 000 0807 specification US Pat. No. 6,543,855 B2 US Patent No. 7,083,215 B2 French patent application 2 842 476 A1 specification

  The present invention therefore addresses the problem of providing an improved embodiment for a vehicle seat of the above type, which is characterized in particular by improved crash performance.

  The above problems are solved according to the invention by the subject matter of the independent claims. Advantageous embodiments are the subject matter of the dependent claims.

  The basic concept of the present invention is that the screwing direction of the screw for screwing the seat frame to the side fitting is rotated by 90 °. Thus, the screwing direction of the screw, i.e. the longitudinal axis of the screw, does not extend in the lateral direction of the vehicle as in the prior art, but here it extends in the vertical direction of the vehicle, i.e. parallel to the z-axis. As a result, at the time of a collision, the screw is not subjected to a torsional load and receives only a lateral force. Since the screws are designed and dimensioned with respect to lateral forces, the absorption of lateral forces can be greatly improved by the screws. The automobile seat according to the present invention has a seat frame and a backrest frame, and the backrest frame is pivotally connected to the seat frame by a fixture on each side. Due to the screw connection between the fixture according to the invention and the seat frame, i.e. the direction of the screw in the vertical direction of the vehicle according to the invention, etc., the torque causes the screw to have a stress center distance during a collision, e.g. And only receive lateral forces through the respective tension and compression straps of the seat frame. Furthermore, the arrangement according to the invention and the direction of the vertical screw of the vehicle makes it possible to maximize the distance of the screw from the neutral axis. As a result, the absorption of force by the screw can be optimized. This is because as the distance from the neutral axis increases, the force that must be applied to the screw in order to be able to provide the necessary holding moment. In this context, a further important advantage to be mentioned is that the vertical screw orientation of the vehicle corresponds here to the die-cutting direction, so that improvements, in particular in terms of manufacturing technology, can be realized. That is.

  In an advantageous development of the solution according to the invention, at least one of the fixtures is designed to be U-shaped and the two U-shaped straight sections define (enclose, enclose) the seat frame. The U-shaped straight part extends parallel to the lateral direction of the vehicle, and at least one screw extending parallel to the vertical direction of the vehicle is guided through each U-shaped straight part and screwed to the seat frame. Is done. With this embodiment of the lower part of the fixture, i.e. the fixture facing the seat frame, the fixture can itself be designed to have a relatively high rigidity, and by virtue of the configuration surrounding the seat frame, in particular the seat frame. It can be connected firmly.

  The seat frame preferably has tension and compression straps, and the fixture is screwed directly to the tension and compression straps, respectively. By screwing the fittings directly onto the tension and compression straps of the seat frame, a particularly favorable force flow can be achieved, especially during a rear impact. The tension and compression straps are also designed to have a particularly high stiffness and to absorb large loads. The tension and compression straps customarily extend above or below the seat frame.

  In a further advantageous embodiment of the solution according to the invention, the seat frame and / or the back frame are formed from a lightweight metal, in particular cast magnesium. For example, magnesium is about 30% lighter than aluminum, but the strength can be increased considerably by adding the corresponding alloying elements. Particularly advantageous in the case of this type of magnesium alloy is in particular its very good casting properties. This property also enables the production of complex die castings with high surface quality. It is furthermore very advantageous in this case that magnesium does not have a corrosive effect on steel crucibles and molds, such as for example aluminum melts, and that processing can be carried out with a smaller draft.

  Further important features and advantages of the invention are apparent from the dependent claims, the drawings and the description associated with each drawing made with reference to the drawings.

  It goes without saying that the features mentioned above and the features described below can be used not only in the respective combinations described, but also in other combinations or alone, without departing from the scope of the invention.

  Preferred exemplary embodiments of the invention are shown in the drawings and are explained in more detail in the following description. The same reference numbers represent the same, similar or functionally identical components.

1 is a schematic side view of an automobile seat according to the present invention. FIG. 6 is a schematic diagram illustrating a screw connection according to the present invention for holding a seat frame to an associated fixture.

  According to FIG. 1, an automobile seat 1 according to the invention has a seat frame 2 and a backrest frame 3. The backrest frame 3 is connected to the seat frame 2 by means of corresponding fittings 4 (see also the detailed view of FIG. 2) on each side. Here, each fixture 4 includes an upper portion 5 facing the backrest frame 3 and a lower portion 6 facing the seat frame 2. The two parts 5, 6 of each fixture 4 are pivotably attached to each other. This allows the back frame 3 to rotate relative to the seat frame 2 in a conventional manner. In this case, the upper part 5 of the fixture 4, and thus the fixture 4 itself, is screwed to the back frame 3. Here, the screwing direction of the at least one screw 7, i.e. the longitudinal axis of the screw 7, preferably extends in the longitudinal direction of the vehicle, i.e. the x direction. This makes it possible to hold the backrest frame 3 particularly well during a collision in which an impact force is generated particularly in the longitudinal direction of the vehicle. Also, in order to be able to optimally transmit the large forces generated in the seat frame 2 especially in the event of a collision, in the motor vehicle seat 1 according to the invention, at least one of the respective fixtures 4 is fixed to the associated seat frame 2. The screwing direction of the two screws 8 extends substantially in the vertical direction z of the vehicle. In addition to improved force absorption, the screw 8 extending in the vertical direction z of the vehicle extends in parallel with the die-cutting direction and is therefore particularly preferred from the standpoint of manufacturing technology. In this way, in particular, the assembly and disassembly of the automobile seat 1 can be improved. To clarify the improved force profile with the screw 8 arranged according to the invention, reference is made in particular to FIG.

Turning now to FIG. 2, the effective distance A between the two forces F, and therefore also the middle, compared to the conventional case in which the screw 8 ′ (shown only in dashed lines in FIG. 2) extends in the lateral direction y of the vehicle. It can be seen that the stress center distance A / 2 with respect to the vertical axis 9 is considerably large. With the screw 8 'extending in the lateral direction y of the vehicle, the stress center distance is only A ^* / 2 and is therefore much shorter than A / 2. As a result, less force can be absorbed with the same thread quality. Thus, the screw 8 arranged according to the invention maximizes the stress center distance A / 2 with respect to the neutral axis 9, thereby allowing a considerable increase in force absorption. This brings about a favorable effect especially at the time of a collision. In this case, the moment is always zero on the neutral shaft 9.

  1 and 2, it can be seen that the fixture is designed in a U-shape. Two U-shaped straight portions 10, 10 'define (enclose) the seat frame 2, and the U-shaped straight portions 10, 10' extend parallel to the lateral direction y of the vehicle. At least one screw 8, here two screws 8, preferably extending parallel to the vertical direction z of the vehicle and guided through each U-shaped straight part 10, 10 ′ and screwed to the seat frame 2. The

  The seat frame 2 and / or the back frame 3 are preferably formed from a lightweight metal, in particular cast magnesium. Therefore, since it is light in weight, it is particularly suitable for manufacturing sports cars. As an alternative, for example, the back frame 3 can also be designed as a sheet metal molded part.

  The seat frame 2 also has tension and compression straps 13, 13 '. A force is introduced via the tension and compression straps 13, 13 'and the fixture 4 is connected or screwed to the seat frame 2 via the tension and compression straps 13, 13'. Since the fixture 4 itself needs to withstand particularly high loads, the fixture is preferably designed as a steel part and can therefore absorb large forces. The tension and compression straps 13, 13 'are indicated by arrows and broken lines in FIG. Here, depending on the moment to be introduced, the tension strap 13 extends along the upper U-shaped straight part 10 or along the lower U-shaped straight part 10 '.

  Obviously, a cushion 12 with a cover can be arranged in a known manner on both the seat frame 2 and the back frame 3. Since the cushion 12 is laid on and covers the seat frame 2 and the backrest frame 3, the cushion 12 can be comfortably and comfortably seated on the automobile seat 1.

  With the motor vehicle seat 1 according to the invention, the screw connection according to the invention and the orientation of the screw 8 makes it possible to absorb a relatively large force in the connection area between the fixture 4 and the seat frame 2, so that The automobile 11 equipped with the automobile seat 1 can be formed to have particularly high safety. With a relatively large stress center distance, the screw 8 can be sized smaller, thus reducing the weight and still absorbing the same amount of force. Furthermore, the screwing direction of the screw 8 extends substantially parallel to the die-cutting direction, that is, in the vertical direction z of the vehicle, so that the automobile seat 1 can be easily assembled or disassembled.

DESCRIPTION OF SYMBOLS 1 Automobile seat 2 Seat frame 3 Back frame 4 Attachment 5 Upper part 6 Lower part 7 Screw 8 Screw 9 Neutral shaft 10, 10 'Straight part 11 Car 12 Cushion 13, 13' Tension and compression strap A Effective distance F Starting force y Lateral direction z Vertical direction of the vehicle

Claims (10)

A seat frame (2) and a back frame (3) pivotally connected to the seat frame (2) by a fixture (4) on each side, wherein the fixture (4) is at least In the car seat (1) screwed to the seat frame (2),
The screwing direction of the at least one screw (8) fixing each fixture (4) to the associated seat frame (2) extends in the vertical direction (z) of the vehicle ;
The fixture (4) includes a U-shaped portion, and the U-shaped portion includes two straight portions (10, 10 ') extending in parallel to the lateral direction (y) of the vehicle. The straight portions (10, 10 ') are respectively arranged on the upper and lower surfaces of the seat frame (2), and a plurality of the screws (8) are inserted from the upper side through the straight portions (10). A car seat (1) , which is screwed into the seat frame (2) from below via (10 ' ).   The vehicle seat according to claim 1, characterized in that at least one of the fittings (4) is designed to define or surround the seat frame (2).   Each fixture (4) is formed of an upper part (5) facing the back frame (3) and a lower part (6) facing the seat frame (2), the upper part (5) and the lower part ( The vehicle according to claim 1 or 2, characterized in that 6) are pivotably attached to each other, whereby the back frame (3) can be pivoted.   4. The motor vehicle seat according to claim 1, wherein each fixture (4) is fixed to the seat frame (2) by means of at least two screws (8). 5. The vehicle seat according to claim 1, wherein the seat frame (2) and / or the back frame (3) is formed from a lightweight metal comprising cast magnesium . 5. The vehicle seat according to claim 1, wherein the back frame (3) is designed as a part molded from sheet metal .   The seat frame (2) has tension and compression straps, and the fitting (4) is screwed directly to the tension and compression straps (13, 13 '), respectively. The automobile seat as described in any one of -6.   8. A car seat according to any one of the preceding claims, characterized in that a cushion (12) with a cover is arranged on both the seat frame (2) and the back frame (3). .   The car seat according to any one of claims 1 to 8, characterized in that at least one of the fittings (4) is made of steel.   An automobile in which the automobile seat (1) according to any one of claims 1 to 9 is arranged in a passenger compartment.

Images