KR20120140352A - Double plate type seat back frame with enhanced comfort - Google Patents

Abstract

PURPOSE: A composite seat back frame is provided for passengers to feel more comfortable by absorbing shock. CONSTITUTION: A composite seat back frame comprises a back frame, a shell plate(S), and a seating portion(200). The back frame is made of fiber-reinforced thermoplastic resins, and comprises a rib for reinforcing stiffness. The shell plate is locally welded on the rib of the back frame. The seating portion is formed on a part of the shell plate, and formed into a round shape. The thickness of polyurethane foam on the seating portion is thicker than the other portions so that passengers feel comfortable.

Description

Double seat back frame with improved comfort {DOUBLE PLATE TYPE SEAT BACK FRAME WITH ENHANCED COMFORT}

The present invention relates to a double-sheet seat back frame with improved comfort, and more particularly, to a double-sheet seat back frame with improved comfort by preventing a decrease in cushioning while satisfying both strength and emotional quality.

In general, the seat back of the vehicle is a means for providing a comfortable and comfortable riding environment by supporting the back of the passenger connected to the seat cushion that supports the hip of the occupant.

Such a seat back is usually formed of a plastic material and forms ribs 12 or channels 14 on the seat back frame 10 as shown in FIG. 1 to maintain strength. Doing.

However, this structure helps to maintain an appropriate level of strength, but there is a limit to sufficiently increasing the stiffness of the product.

In addition, there is an example of further reinforcing the strength by using a steel-like reinforcement bracket or a plate-like reinforcement, but in this case, the weight increases rapidly, which is very disadvantageous in terms of competitiveness and disadvantageous in terms of rigidity.

In other words, the stiffness of the seat back frame is not the same as that of the strength. The strength of the seat back frame refers to the strength of the object, that is, the deformation resistance until the material is destroyed when the material is loaded. Stiffness refers to the hardness or rigidity of the material. In the case of the seat back frame, the concept includes emotional quality.

For example, when passengers sit down, when seats are folded down, and when the armrest is pressed, the seat back frame lacks the rigidity. It is difficult to quantify the criteria, but it needs to be minimized.

Therefore, although the product strength that satisfies the international performance regulations is secured through the strength reinforcement as described above, such a lack of rigidity still occurs.

In order to solve this problem, fiber reinforced plastic resins (GMT, LFT, etc.) are used to reduce the weight of the seat back frame while improving both strength and rigidity to absorb static or dynamic impact energy to secure vehicle safety functions. Efforts have been raced.

For example, in connection with the seat back frame, Patent Publication No. 2008-100499 discloses a technique for improving strength and rigidity by vibrating two plates in a sandwich structure, and Patent Publication No. 2010-0097776. A technique for achieving both the purpose of weight reduction and strength and rigidity improvement by providing a sandwich structure in the form of joining through two ribs through a rib is disclosed.

However, when stiffness increases with sufficient strength, the deformation energy due to impact decreases, so it is difficult to secure the emotional quality due to the low impact absorption ability.On the contrary, when the impact absorption power is increased by having the appropriate deformation energy to secure sufficient emotional quality, It is very difficult to find an alternative that satisfies both of these properties due to the conflicting stiffness and difficult specification.

In other words, if the stiffness is increased, there is a problem in the legal performance of absorbing energy through deformation, and if the energy absorption structure is made to have a proper deformation, a problem of insufficient product rigidity occurs.

In this regard, in the disclosed prior patents, a sandwich structure is formed by interposing a core 24 between two plates 20 and 22, as shown in FIG. 2, and then, between the core 24 and the plates 20 and 22. Are bonded to each other by heat fusion or adhesive bonding, or vibration welding, which form a hollow portion in which the two plates 20 and 22 are entirely spaced apart, and the core 24 is interposed therebetween. ) Is an intervening form, so the shock absorbing performance due to impact is excellent, but the strength is low, and it has a limitation that it is difficult to satisfy the rigidity requirements as described above.

The present invention was made in view of the above-mentioned problems in the prior art, and was created to solve this problem. The main purpose is to provide a higher-quality seat back frame that satisfies both rigidity and shock absorbing performance, but also improves the comfort of the occupant when riding.

The present invention is a means for achieving the above object, a back structure made of a fiber-reinforced thermoplastic resin, a back frame comprising a rib for strength reinforcement, and a shell plate locally bonded on the rib of the back frame In the seat back frame of the; A seating part is formed on a part of the shell plate, and the seating part is rounded toward the back frame so that when the polyurethane foam is overlaid, the thickness of the polyurethane foam covered on the seating part becomes thicker than the rest, thereby providing more comfort. It provides a comfort-enhanced double-sheet seat back frame characterized in that it is raised.

At this time, the local bonding in which the shell plate is fixed on the rib of the back frame is characterized in that the vibration welding method.

In addition, the local bonding in which the shell plate is fixed on the rib of the back frame is also characterized in that the screwing method.

According to the present invention, while securing a strength greater than the specified amount without significantly increasing the weight and at the same time receiving a shock or a force of a certain level, the locally fixed portion falls and absorbs energy, and thereby the front plate (shell plate) It prevents damage and prevents harmful damage to the rear plate (mainframe) to prevent sharp edges, reducing the threat of occupants, resulting in a safer and more comfortable high quality seat back frame.

In addition, it is possible to obtain the effect of satisfying both the stiffness and the energy absorption due to deformation, without modifying or redesigning a mold for manufacturing an existing seat back frame.

In addition, it is possible to obtain an effect of improving the assemblability and easy installation, and furthermore, it is possible to prevent a decrease in comfort when riding by preventing a decrease in thickness of the cushion.

1 is an exemplary view of a seat back frame according to the prior art.
2 is a cross-sectional view illustrating main parts of an example of a seat back frame according to the related art.
3 and 4 are exemplary views and partial cross-sectional views of the double-sheet seat back frame according to the prior patent application No. 2011-25247 for explaining the concept of the present invention.
5 is an illustration of a back frame constituting a double sheet back frame according to the prior patent application No. 2011-25247 for explaining the concept of the present invention.
Figure 6 is an exemplary view comparing the difference in the thickness of the polyurethane foam to be covered in the double-sheet seat back frame according to the prior patent application No. 2011-25247 for explaining the concept of the present invention.
7 is an exemplary front view of a seat back frame according to the present invention.
8 is an exemplary perspective view of a seat back frame according to the present invention.
9 is an exemplary side cross-sectional view of a seat back frame according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 and 4 are exemplary views and partial cross-sectional views of the double-sheet seat back frame according to the prior patent application No. 2011-25247 for explaining the concept of the present invention.

The present applicant has filed Patent Application Nos. 2011-25247, 2011-25247 and 2011-25248 in connection with the present invention.

3 and 4, as disclosed in these prior patent applications, the seat back frame 100 to which the present invention belongs is made of a fiber-reinforced thermoplastic resin, which is an improved material as in the prior art described above.

Here, the fiber-reinforced thermoplastic resin includes both glass fiber mat thermoplastics (GMT), including long fiber thermoplastics (LFT).

The seat back frame 100 has a plate shape in which the shell plate S is partially screwed to one surface of the back frame 110, which is a base, and the back frame 110 and the shell plate S are formed in two layers. .

At this time, the shell plate (S) is partially installed on one surface of the back frame 110, and the partially installed shell plate (S) is not screwed entirely, but at a point where a plurality of ribs (102) cross each other. It is preferable to have the form of screwing, that is, the form of screwing partially.

Of course, the basic fixing structure for fixing the shell plate (S) to the back frame 110 has a screw fastened to the back frame 110 at intervals along the edge of the shell plate (S), but this screw, that is, Plate fixing screw (B1) is a means for simply holding the shell plate (S) to the back frame 110, the joining screw for achieving the desired purpose of the present invention is the rib 102 and rib 102 intersect. Joining screw (B2) is fastened to the point to be obtained, the shell plate (S) in the portion joined by the joining screw (B2) to obtain the effect of the partial joining so as to satisfactorily meet both the strength and the emotional quality during the collision. It will work.

Accordingly, the back frame 110 includes a rib 102 or a channel 104, which is a conventional structure provided for strength reinforcement.

In addition, the shell plate (S) is a plate-like member, has a form padded on the back frame 110 to be installed, for example, on a plurality of ribs 102 protruding on one side of the back frame 110. It has a structure which is put in the form as shown in FIG.

At this time, the shell plate (S) may have a form of a multi-layer sandwich itself, it is provided to be bonded only to the weakest sensitivity of the quality in the back frame 110 through tens to hundreds of actual vehicle tests.

In particular, the shell plate S is partially bonded to the back frame 110 while including a specific point (a part having a poor quality of emotion), which is not the entire surface of the back frame 110, as described above.

4, a part of the shell plate S is seated on the ribs 102 of the back frame 110, and joined in a form of partially screwed in the seated state.

In this case, the main means for joining the shell plate (S) is the joining screw (B2), the joining screw (B2) is fastened at the portion where the ribs 102 cross each other.

To this end, a boss 112 having a '+' shape protrudes from the intersection points of the ribs 102, which are portions at which the joint screw B2 is fastened, as illustrated in FIG. 5, and at the center of the boss 112. A screw hole 114 is formed to fasten the joining screw B2.

In addition, in some cases, when a space for installing the armrest fixing hinge bracket is required on a portion of the shell plate S, a portion of the shell plate S may be cut and removed by a corresponding size, or the shell plate may be removed at all. (S) From the molding step may be pre-designed and molded to fit the back frame 110 having an armrest.

In addition, the shell plate S is formed to have a smaller size than the back frame 110, because the shell plate S is not overlapped over the entire surface of the back frame 110 but overlaps only a part thereof.

In this case, if the general welding method of completely welding the shell plate S over the entire surface of the back frame 110 is selected, desired characteristics, that is, desired rigidity cannot be obtained.

This is because welding is usually the main concept of perfectly integrating the two materials so that they do not easily fall off, so in this case the strength is strengthened, but the ability to absorb deformation due to impact is reduced, so during the crash collision test (ECE R17). This joining method is very disadvantageous, as sharp edges appear in the same way as in the conventional fault model, which poses a threat to the occupants.

Accordingly, the present invention provides a partial joint fastening structure of a partial screwing method capable of local joining disclosed in the above-mentioned patent application and absorbing the impact of a collision, and a partial joint complex joining structure through a local vibration welding method. Is the basic model.

Here, the part about the vibration welding has not been described in detail, but it is well shown in another prior patent application No. 2011-25246 (2011.03.22) by the present applicant.

As is well known, vibration welding presses two thermoplastic resins between the products and gives left and right vibrations to the upper jig to melt the resin with frictional heat generated at the contact portion, and after the sufficient melting, the product is aligned. It is a method of fusion by cooling while pressurizing in a state.

When the vibration welding is used, the welding surface is separated from each other when a certain amount of external force is applied while the local welding is easily achieved.

In other words, during the luggage collision test (ECE R17), the same sharp damage area as the existing fault model is not generated, thereby minimizing the threat of occupants.

After all, the present invention has a structure that can absorb the impact while the local joints are separated from each other in the case of having a double structure to maintain a local joint regardless of whether through the method of vibration welding or screwing method In this case, the local screwing part is made at the intersection point of the rib 102, but in particular, it is closest to the point which is determined to be the most vulnerable through a test (analyzes the waveform of impact energy in the event of a collision). At the intersection of the ribs 102.

Through this, the present invention can achieve both the improvement of the emotional quality and the desired strength.

In addition, the prior patent application can further improve the comfort of the occupant by forming the hole (H) by drilling the shell plate (S) in the form as shown in FIG.

This is the thickness (D) of the polyurethane foam (PU) when the back frame 110 is formed of a single plate and a rib 102 protrudes on the single plate as shown in FIG. 6) does not significantly inhibit the comfort of the occupant, the thickness (D2) of the polyurethane foam (PU) when the plate-shaped shell plate (S) is screwed and bonded to the back frame 110 as shown in Fig. 6 (c) ) Is greatly reduced, which can hinder the comfort of the occupant.

Accordingly, in the case of the prior patent application technology by the applicant, a plurality of holes H are formed by using a part of the shell plate S, preferably a part where the joint screw B2 is not fastened, as a main point. Partially filled to the back frame 110 through, as shown in Figure 6 (b), partially made the thickness (D1) of the polyurethane foam (PU) the same as in the case of the existing single plate is to reduce the comfort of the occupant It was configured to prevent.

In the present invention, it is assumed that the seat back frame of the double structure illustrated in FIGS. 3 to 5 and the seat back frame of the double structure having a local vibration welding method, although not shown, are not formed as shown in FIG. 6. 7 to 9, by rounding the seating part 200 of the occupant to increase the thickness of the resulting polyurethane foam, the comfort, that is, comfort can be further improved.

In other words, through the shape processing of the seating portion 200 according to the present invention can obtain the same effect as in Figure 6 (b), it can be seen as another improvement of the prior application technology.

To this end, in the present invention, as shown in detail in FIG. 8, a part of the shell plate S constituting the double plate, that is, a part corresponding to the seating part 200 is rounded.

In summary, the present invention rounds the shape of a portion of the shell plate S to the seating portion 200 of the seat back frame having a local bonding structure (shell plate + back frame) to increase comfort and cushioning comfort. It is to improve even more.

As described above, the seat back frame according to the present invention has a merit that it is easy to process, shorten the working time, and improve the comfort improvement effect, since only the shape of the seat 200 is rounded when the shell plate S is processed. do.

100: seat back frame 102: rib
110: frame 112: boss
114: screw hole 200: seating portion
S: shell plate

Claims (3)

It is made of a fiber-reinforced thermoplastic resin, made of a back frame 110 including a rib 102 for strength reinforcement, and a shell plate (S) locally bonded on the rib 102 of the back frame 110 A seat back frame having a double structure;
A seating part 200 is formed on a part of the shell plate S, and the seating part 200 is rounded toward the back frame 110 to be seated on the seating part 200 when the polyurethane foam is covered. Comfortable double seat back frame, characterized in that the thickness of the overlaid polyurethane foam is thicker than the rest area for more comfort. The method according to claim 1;
The locally bonded double shell seat back frame, wherein the shell plate (S) is fixed on the rib of the back frame 110 is a vibration welding method. The method according to claim 1;
A locally improved double seat seat frame, wherein the shell plate (S) is fixed on the rib of the back frame (110) is a screwing method.

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