KR20040085239A - Seatback frame for bus - Google Patents

Abstract

PURPOSE: Structure of a seat back frame for a bus is provided to reduce the weight by substituting parts of the seat back frame with aluminum, to reinforce the fatigue strength by modifying the section of the main pipe, and to improve the freedom of design by reducing the size of the pivot arm bracket. CONSTITUTION: A seat back frame(100) of a bus is composed of a main pipe(10), an upper pipe(12), a pivot arm bracket(14) and a hinge bracket(16) attached to the lower part of the main pipe. The rectangular sections of the main pipe and the upper pipe are divided into plural spaces, and an installation hole is penetrated in the lower part of the main pipe. A fixing bracket is attached to the lower inside of the main pipe, and the hinge bracket is attached to the outside. The main pipe is combined with the hinge bracket by inserting and combining a side frame assembling bolt(40) with the fixing bracket.

Description

Seatback frame structure for buses

The present invention relates to a structure of a seat back frame for a bus, and more particularly, to replace a steel material with an aluminum material in order to achieve a lighter weight and to improve the cyclic fatigue strength of a passenger load. And a seat back frame structure for a bus which improves the fastening structure between the main pipe and the side frame and the reclining cylinder.

In general, seats for buses (especially express buses) are basically provided with seat back tilt angle adjusting devices, foot rests, armrests, etc. in order to provide comfort to passengers according to long distances. It is equipped with such a convenience device.

Here, with reference to the accompanying Figures 5 to 6 will be described the structure of the seat back frame for a conventional bus.

The outer frame of the seat back frame 100 is composed of a main pipe 10 arranged in parallel to each other in the longitudinal direction and a top pipe 12 which integrally connects the upper end of the main pipe 10, These pipes are currently made of heavy steel, and their cross-sectional shape is in the form of hollow circular tubes.

As shown in FIG. 4 showing the left LH of the sheet arranged in pairs, a pivot arm bracket 14 is attached to the lower end of one main pipe 12 and the other main pipe ( At the lower end of 12), a hinge bracket 16 for mounting a side frame and a reclining cylinder is attached by welding or the like.

On the other hand, the skeleton of the seat frame 200 is three side frames 18 parallel to the front and rear direction, cross-pipe 20 which is arranged in parallel to the left and right through the front and rear ends of the side frames 18, And a support pipe 22 integrally connected to the bottom of the cross pipe 20 and supported on the bottom surface.

Here, the lower end of the pivot arm bracket 14 is connected to the rear end of the side frame 18 at the center position so as to be rotatable back and forth, and the hinge bracket 16 is at both sides of the side frame 18. It is connected to the rear end of.

Various additional means are further mounted on the skeletal structure, and a reclining cylinder 24 is mounted at the lower end of the hinge bracket 16 to adjust the forward and backward inclination angle of the seatback.

Further, a head plate 26 for supporting the head of the passenger is mounted over the inner region of the upper pipe 12, and a support plate 28 for attaching a handle to the rear of the seatback is attached.

On the other hand, since the load applied when the passenger is seated is concentrated on the lower end of the hinge bracket 16 to impose a continuous torsional load, the hinge bracket 16 and the pivot arm bracket 14 to alleviate such an applied load. Between the upper end of the separate auxiliary cross pipe 30 is further connected.

In addition, in the space between the lower end of the support plate 28 and the upper end of the angle plate 32 (the space between the two main pipes), a plastic plate 34 to which a cup holder, an ashtray, and a receiving mesh is assembled when the seat is assembled is padded. It will break.

However, in the existing seatback frame structure having such a structure, the existing seatback frame structure including the components and the connection parts such as assembly / fastening / joining of them is preferred in terms of fatigue strength against passenger cyclic load. Inefficiently designed, there is a problem in that the rigidity is reinforced by increasing the size and weight of the hinge bracket.

In particular, with the exception of the plastic plate, all the components such as the main pipe and the upper pipe are applied to the steel material, which causes a problem that the weight of the entire sheet is increased, which causes a decrease in portability, assembly properties, and productivity. Ultimately, the fuel consumption of the vehicle is reduced.

In view of the above problems, the present invention has been developed to reduce weight and improve parts transportability / assembly / productivity and increase fuel efficiency of a vehicle through an optimal design of a seat back frame and application of other materials. Replace the entire components of the seat back frame with aluminum and simultaneously apply the main pipe and top pipe that are integrally formed to reinforce the fatigue strength to the cross section of the eyepiece, and change the shape of the pivot arm bracket to a smaller size. In addition, it is an object of the present invention to provide a structure of the seat back frame for the bus so that the shape of the hinge bracket can be easily changed to a free design structure.

1 is a perspective view showing the structure of a seat back frame for a bus according to the present invention;

2 is a sectional view showing the main parts of a structure of a seat back frame for a bus according to the present invention;

3 is a photograph showing that the repeated fatigue endurance test for the seat back frame for the bus according to the invention,

Figure 4 is a photograph showing that the seat belt anchorage test for the seat back frame for the bus according to the invention,

5 is a perspective view showing the structure of a conventional seat back frame for a bus;

6 is a perspective view showing a state in which a conventional ship back frame for buses is mounted on a side frame;

<Explanation of symbols for the main parts of the drawings>

10: main pipe 12: top pipe

14: pivot arm bracket 16: hinge bracket

18: side frame 20: cross pipe

22 support pipe 24 reclining cylinder

26: head plate 28: support plate

30: secondary cross pipe 32: angle plate

34: plastic plate 36: back fixing bracket

38: mounting hole 40: side frame fastening bolt

100: seat back frame 200: seat frame

The present invention for achieving the above object in the structure of the seat back frame for the bus including a main pipe and a top pipe, a pivot arm bracket and a hinge bracket attached to the bottom of the main pipe integrally formed with each other, the main pipe and the top The pipe is formed into a rectangular section divided into several spaces, and forms a mounting hole penetrating left and right at the bottom of the main pipe, and a separate backside fixing bracket is attached to the bottom inner surface of the main pipe including the mounting hole. In addition, the outer surface is provided with a structure of the seat back frame for the bus, characterized in that the hinge bracket is padded and fastened with a side frame fastening bolt.

In a preferred embodiment of the present invention, the cross-sectional shape of the main pipe and the upper pipe is formed in a snow shepherd (目) structure, the mounting hole is characterized in that formed through the central space of the snow shepherd space.

In particular, the pivot arm bracket mounted on the bottom of the main pipe is a "b" shaped structure, characterized in that the pair is mounted while surrounding both sides of the bottom of the main pipe.

In addition, four support plates may be mounted side by side in the inner side of the main pipe arranged vertically in parallel.

In addition, two angle plates in the longitudinal direction are further attached between the two lower support plates of the support plate.

In another preferred embodiment of the present invention, the main pipe and the top pipe, the support plate, the angle plate, the auxiliary cross pipe is characterized in that the extruded aluminum.

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

1 is a perspective view showing the structure of a seat back frame for a bus according to the present invention, Figure 2 is a sectional view showing the main part showing the structure of the seat back frame for a bus according to the present invention, the same reference numerals for the same configuration name as the prior art It is indicated by a sign.

As described above, the components of the seat back frame for the bus are pivot arm brackets attached to the bottom of the main pipe 10 and the top pipe 12 and one main pipe 10 forming the outer skeleton of the seat back frame 100 ( 14) a hinge bracket 16 attached to the lower end of the other main pipe 10, a head plate 26, a support plate 28, and an auxiliary cross pipe attached over an inner region of the upper pipe 12; And 30.

The seat back frame for the bus of the present invention applies only the pivot arm bracket 14 and the hinge bracket 16 to the steel material, and the remaining main pipe 10 and the top pipe 12, the support plate 28, the auxiliary cross pipe (30), the angle plate 32 was applied as an extruded aluminum material, the head plate 26 was applied to press-molded aluminum plate material.

Thus, by applying an aluminum material unlike the conventional steel material, it is possible to achieve a significant weight reduction, that is, light weight.

Here, the cross-sections of the main pipe 10 and the upper pipe 12, which are integrally formed with each other, may be formed into a rectangular structure, and divided into various spaces so as to reinforce strength.

Preferably, the cross-sectional structures of the main pipe 10 and the upper pipe 12 are molded into a eye sheath, so that the fatigue strength is sufficiently considered in consideration of the cyclic load and the torsional load imposed on the lower end when seating the passenger. It can be reinforced.

Meanwhile, as described above, the rigidity of the hinge bracket is reinforced in consideration of the torsional load continuously acting on the lower end of the hinge bracket 16, but in the present invention, the rigidity of the main pipe 10 and the upper pipe 12 is increased. By reinforcing the shape design of the hinge bracket 16 can be easily designed without being limited to the rigidity.

Therefore, the weight of the hinge bracket 16 can also be reduced by about 50%.

In addition, as the rigidity of the main pipe 10 and the upper pipe 12 is increased, the size and weight of the pivot arm bracket 14 mounted on the lower end of the main pipe can also be reduced, and the pivot arm bracket 14 ) Is designed to form a simple "b" shape to apply the molded.

Here, with reference to the accompanying Figure 2 will be described the fastening state between the main pipe and the hinge bracket as follows.

The main pipe 10 is a pair of vertically arranged bar, the mounting hole 38 is formed in the lower end of the outer main pipe 10 through the left and right. In more detail, the mounting hole 38 is formed through the central space of the cross section space of the eye shepherd of the main pipe 10.

Therefore, a separate back fixing bracket 36 is padded on the bottom inner surface of the main pipe 10 including the mounting hole 38, and a hinge bracket 16 is padded on the outer surface, so that the back fixing bracket ( By inserting and fastening the side frame fastening bolt 40 from 36, the fastening between the main pipe 10 and the hinge bracket 16 is made.

On the other hand, the pair of "b" shaped pivot arm bracket 14 is mounted while wrapping both sides of the lower end of the main pipe 10 arranged inside.

In addition, four support plates 28 are formed at approximately equal intervals up and down in the inner region of the vertically arranged main pipe 10 so as to exclude the plastic plate 34 and achieve common parts. It is mounted side by side in parallel.

In addition, two angle plates 32 are further attached in the longitudinal direction between the lower two support plates of the support plates 28 to facilitate installation of handles, a receiving mesh, an ashtray, and the like.

The bus seatback frame of the present invention having such a structure was subjected to repeated fatigue endurance test based on the seatback frame standard test (ES88001-2) (see photo of FIG. 3).

* Test standard: [38Kgf load × 60,000 times] is applied to the upper part of the seat back frame.

* Test method: A grip connected to a device for applying a load to the upper end (upper pipe) of the seat back frame is installed, and a load of 38 kgf is repeatedly applied 60,000 times.

The test results are shown in Table 1 below.

Number of loads result 40,000 satisfied +20,000 (60,000) Satisfaction (100%) +12,000 (72,000) Satisfaction (120%) +28,000 (100,000) satisfied +30,000 (130,000) Head plate breakage

As shown in Table 1 above, the seat back frame was not deformed until the number of load loads (100,000 times), and the head plate was broken at about 130,000 loads.

Through this test, the seat back frame of the present invention is applied aluminum material to the seat back frame, change the cross-sectional shape of the main pipe to the eye shepherd, and differently apply the fastening structure between the main pipe and the hinge bracket is a conventional steel material Compared with the tubular seat back frame, the weight can be greatly reduced, and the repeated fatigue strength is remarkably excellent.

On the other hand, Figure 4 is a picture showing the seat belt anchorage test, it shows that the deformation between the existing steel seat back frame and the aluminum seat back frame of the present invention.

In other words, the seat belt anchorage test is a test for measuring the deformation of the seat frame as the dummy is seated on the seat and tied to the seat belt for testing, and then the seat belt is loaded. The test conditions are as follows. .

* Load direction: 10 ± 5 ° forward

* Load Position: 3 Points of Lap Belt

* Load Load: 300Kgf

* Requirement: There should be no breakaway of the load and no dissociation of the buckle.

As a result of this test, both the conventional steel seat back frame and the aluminum seat back frame of the present invention satisfied the legal reference value without excessive deformation.

As described above, according to the structure of the seat back frame for the bus according to the present invention, the aluminum material is applied to each component of the seat back frame, the cross-sectional shape of the main pipe is applied to the eye, the main pipe, the side frame and the reclining. By applying the fastening structure between cylinders differently from the conventional, it can achieve a 50% weight reduction significantly compared to the tubular seatback frame to which the existing steel material is applied, and provides an advantage that the repeated fatigue endurance performance is improved by about 200%.

In addition, according to the weight reduction, parts transportability, assembly, productivity can be improved, and ultimately, effects such as fuel economy reduction and exhaust gas emission reduction can be obtained.

Claims (6)

In the structure of the seat back frame for the bus including the main pipe and the upper pipe which is integrally formed with each other, the pivot arm bracket and the hinge bracket attached to the bottom of the main pipe, The main pipe 10 and the top pipe 12 are formed into a rectangular cross section divided into various spaces, and form mounting holes 38 penetrating left and right at the bottom of the main pipe 10, and the mounting holes. Pad a separate rear fixing bracket 36 on the bottom inner surface of the main pipe 10 including the 38, and on the outside surface by attaching a hinge bracket 40 for fastening the side frame and the reclining cylinder to the side frame fastening. Bus back seat frame structure characterized in that fastened with a bolt (40). The cross-sectional shape of the main pipe (10) and the top pipe (12) is formed in a eye shepherd structure, and the mounting hole 38 is formed through the central space of the eye shepherd space. A seat back frame structure for a bus. The bus according to claim 1, wherein the pivot arm bracket 14 mounted at the lower end of the main pipe 10 has a "b" shape, and a pair is mounted while surrounding both sides of the lower end of the main pipe 10. Seat back frame structure for 2. The seat back frame structure for a bus according to claim 1, wherein four support plates (28) are mounted side by side in an area inside the main pipe (10) arranged vertically in parallel. 5. The seat back frame structure for a bus according to claim 4, wherein two angle plates (32) are further attached in the longitudinal direction between the two lower support plates (28) of the support plates (28). The method according to any one of claims 1 to 5, wherein the main pipe 10 and the top pipe 12, the auxiliary cross pipe 30, the support plate 28, the angle plate 32 is made of aluminum extrusion material. A seat back frame structure for a bus.