CN219214734U - Instrument panel - Google Patents

Abstract

The utility model discloses an instrument panel, wherein the outer surface of an instrument panel framework is coated with a soft lining layer, the instrument panel framework comprises an instrument panel framework body provided with an air bag explosion port, an air bag support is arranged in the air bag explosion port, the air bag support comprises a frame body formed by surrounding plates and a breakable panel connected to the outer end of the frame body, the edge of the breakable panel circumferentially extends beyond the frame body to form a joint edge, a stepped mounting surface is formed on the instrument panel framework body corresponding to the edge of the air bag explosion port, and the outer surface of the stepped mounting surface gradually rises outwards from the edge of the air bag explosion port circumferentially; the inner surface of the joint edge is matched with the stepped mounting surface, and the outer surface of the joint edge is a smooth surface. The air bag support and the instrument board framework body have higher matching degree, and the problems of uneven surface, overlarge matching clearance and the like of the instrument board framework finished product are reduced, so that a good foundation is provided for foaming molding of the lining layer, and the surface of the instrument board finished product is smooth.

Description

Instrument panel

Technical Field

The utility model belongs to the field of automobile parts, and particularly relates to an instrument panel.

Background

The technology of the slush molding foaming molding process of the automobile instrument panel is early in development, the slush molding foaming process is also very mature, and the foaming process is widely used on various automobile types. The instrument panel product comprises an instrument panel framework and a soft inner liner 3 covered on the surface of the instrument panel framework, wherein the outer surface of the inner liner 3 is generally a leather-grain slush-molded skin 32 for improving the touch comfort and the aesthetic property, and the slush-molded skin 32 is bonded with the instrument panel framework through a foaming layer 31. The instrument panel skeleton includes an instrument panel skeleton body 1 and an airbag assembly mounted thereon. The air bag is arranged on the air bag bracket 2 (namely an air bag frame) and then is connected with the instrument board framework body 1 in a buckling way to form an instrument board framework. Then the instrument panel skeleton and the slush molding skin 32 are simultaneously put into a foaming mold, and then the foaming material is injected for foaming, and the final product is obtained after solidification. Thus, the smoothness of the surface of the instrument panel skeleton determines the appearance quality of the final product. The mounting mode of the hidden airbag bracket adopted by each host factory on the instrument panel framework comprises the following steps: bolt fastening, friction vibration welding, clamping means, and the like. Wherein the clamping type air bag bracket is most used due to lower cost. The clamping type air bag support is in a structural form of being clamped on the side wall of the mounting hole of the instrument board framework by designing a self-clamping structure on the air bag support. The edge of the breakable panel of the air bag bracket and the edge of the air bag installation opening on the instrument board framework are provided with a section of free-state joint edge, and the width of the joint edge is generally about 30 mm. However, due to the fact that the traditional clamping type air bag support is adopted, the air bag support is affected by factors such as unreasonable design of an air bag support assembling structure, insufficient strength, a foaming mould and the like in a foaming process, poor matching of the air bag support and an instrument board framework can occur, the fact that the air bag support and the instrument board framework are uneven in surface or large gaps exist at joint edges after assembling is mainly reflected, the fact that the surface transition of a foamed product slush molding skin 32 is uneven finally results in the fact that the bulge, bulge or concave defect occurs, and the product quality is affected.

Disclosure of Invention

In view of the above, an object of the present utility model is to provide an instrument panel.

The technical scheme is as follows:

the utility model provides an instrument board panel, includes instrument board skeleton, and the surface cladding of this instrument board skeleton has soft inner liner, instrument board skeleton is including the instrument board skeleton body of seting up the gasbag rupture mouth, install the gasbag support in the gasbag rupture mouth, this gasbag support includes the framework that the board encloses and connects the breakable panel at this framework outer end, the edge circumference of breakable panel extends beyond the part of framework forms the overlap edge, its key lies in, the edge shaping that corresponds the gasbag rupture mouth on the instrument board skeleton body has the echelonment installation face, this echelonment installation face surface outwards rises gradually from the edge circumference of gasbag rupture mouth;

the inner surface of the joint edge is matched with the stepped mounting surface, and the outer surface of the joint edge is a smooth surface;

the breakable panel is flattened with the outside of the instrument panel skeleton body to form an outer surface of the instrument panel skeleton.

In one embodiment, the inner liner layer includes an upper slush molding skin and a lower foaming layer, and the foaming layer is adhered to the outer surface of the instrument panel frame, so that the slush molding skin is flatly adhered to the instrument panel frame.

In one embodiment, the stepped mounting surface includes a first mounting step surrounding the airbag break and a second mounting step surrounding the first mounting step;

the inner side of the edge of the joint edge is thinned to form a fitting step, and the edge thinned part of the joint edge forms a fitting edge;

the attaching edge is attached to the second mounting step to form a first sealing surface, and the attaching step is matched with the first mounting step to form a second sealing surface.

In one embodiment, the first mounting step is integrally formed with at least one ring of circumferential protrusions on the supporting surface in the horizontal direction, the circumferential protrusions are arranged around the airbag rupture port, and the inner surface of the overlap edge falls on the circumferential protrusions.

In one embodiment, the outer surface of the part of the joint edge close to the edge of the joint edge is an inclined surface, the joint edge is lower than the surface height of the instrument panel framework body around the second installation step, the height difference between the joint edge and the instrument panel framework body is d, and the d takes a value of 0.3-0.6 mm;

the inner surface of the attaching edge is in interference fit with the horizontal supporting surface of the second mounting step, and the interference is 0.1-0.3 mm.

In one embodiment, the minimum thickness of the edge of the bonding edge is 1.2-2 mm, and the width of the bonding edge is 3-8 mm;

the width of the lap joint edge is 40-70 mm.

In one embodiment, the airbag support is injection molded from a thermoplastic polyolefin elastomer material having a flexural modulus of 400MPa and above after curing.

Compared with the prior art, the utility model has the beneficial effects that: the strength and rigidity are enhanced through the structural design of the lap joint part of the air bag support and the instrument board framework body, the deformation is reduced, the matching state is improved, the matching is tighter, the surface of the finished instrument board framework is smoother, the problems of uneven surface and overlarge matching clearance of the product are reduced as much as possible, a good foundation is provided for foaming and forming a foaming layer, and therefore the quality of the instrument board final product is improved, and the defect of uneven slush molding surface is reduced as much as possible. In addition, because the stepped matching structure is tighter, the foaming anti-overflow sealing strip between the lap joint edge and the lap joint part of the instrument board framework body in the traditional structure can be eliminated, the process is simplified, and the cost is reduced.

Drawings

FIG. 1 is a schematic illustration of the interaction of a conventional snap-in airbag bracket with an instrument panel skeleton body, shown from an exterior surface perspective;

FIG. 2 is a schematic view of a conventional mounting structure of an airbag bracket and an instrument panel skeleton body, illustrating an inner liner formed of a foamed layer and a slush molding skin;

FIG. 3 is a schematic view of a lap joint structure of a lap joint edge of a conventional airbag bracket and an instrument panel skeleton body;

FIG. 4 is a schematic illustration of the overlapping structure of the airbag bracket and the instrument panel skeleton body of the present utility model;

FIG. 5 is a schematic view showing an exploded structure of an airbag bracket and an instrument panel skeleton body according to the present utility model;

FIG. 6 is a schematic structural view of an air bag holder according to the present utility model;

FIG. 7 is a schematic view of the structure of the slider assembly with the slider in the de-molding position;

FIG. 8 is a schematic view of the structure of the slider assembly with the slider in a close proximity to the molding position;

FIG. 9 is a schematic view of the other view of FIG. 8;

fig. 10 is a schematic view of foaming a foam layer in a foaming mold.

Detailed Description

The utility model is further described below with reference to examples and figures.

The mounting structure of the conventional snap-in airbag bracket 2 on the instrument panel skeleton body 1 is schematically shown in fig. 1, 2 and 3. The joint edge is attached to the outer side of the edge of the air bag installation opening, and the surface of the panel can be damaged to be flat with the surface of the instrument board framework body 1 in a sinking fit mode. The assembled instrument panel skeleton and the slush molding skin 32 are foamed in a foaming mold, a foaming layer 31 is formed after foaming, and the foaming layer 31 bonds the instrument panel skeleton and the slush molding skin 32 together to obtain an instrument panel product. However, the slush molding skin 32 surface of the instrument panel product is susceptible to irregularities. Since the inner liner 3 is a soft coating layer, the irregularities thereof are mainly caused by the instrument panel skeleton. The main reasons for the formation of the rugged defects are as follows:

firstly, the internal stress in the foaming process is released after demolding, and the product is deformed. In the foaming process, the problems of uneven matching of the instrument panel framework or assembling gaps can be caused by uneven pressing of the instrument panel framework and the airbag bracket 2 due to the pressure generated by the reaction of the foamed A, B material or the gap filling and the airbag bracket 2, the product loses constraint after demolding, and the free shape is restored, so that the problems of uneven defects or gaps are presented; or the surface shape of the foaming product is kept due to the limitation of the shape of the cavity of the mould, but after the mould is opened, the external limitation of the product is released, the air bag support 2 is deformed due to the release of the stress in the mould, and the state during assembly is restored, so that the problem of uneven surface of the instrument board product is presented.

Secondly, the surface strength of the air sac bracket product is insufficient. Because the airbag bracket 2 has the requirement of explosion function, a Thermoplastic Polyolefin Elastomer (TPE) material is generally selected for injection molding, but the surface rigidity and the product strength of the injection molded product are low due to the material characteristics; when the air bag support 2 is assembled on the instrument panel framework for foaming, if a gap exists between a sliding block of the foaming mold for abutting against the air bag support and the supporting surface of the air bag support or the sliding block is not at a theoretical design position, the surface deformation (convex or concave) of the air bag support 2 can also occur due to the pressure generated by the A, B material reaction in the foaming process; after the product is cured and opened, the external limitation of the product is removed, the air bag support 2 is restored to the state during assembly, and the problem of protruding or sinking occurs on the surface of the instrument board product.

Thirdly, the influence of foaming pressure, the slider that is arranged in supporting the air bag support in the foaming process is retracted, and after the product is foaming and die sinking completed, the air bag support product is rebound again, and the problem of protruding outwards appears on the surface of the instrument board product. The foaming process is to mix two materials of polyether and isocyanate in a certain proportion to generate chemical reaction, a large amount of gas is generated in the reaction process, and pressure is generated in a closed space of a foaming mold; the B surface of the instrument panel frame is generally clung to an upper mold of a foaming mold, the upper mold supports the instrument panel frame, but because the air bag assembly angle is inconsistent with the demolding angle of the instrument panel product, the foaming mold is generally provided with an air bag bracket demolding slider independently for propping against the air bag bracket, as shown in fig. 10 (the difference between the demolding angle of the instrument panel product and the demolding slider angle is not illustrated in the figure); if the air bag support sliding block of the foaming mold has no self-locking structure after mold closing, the air bag support and the air bag sliding block can be affected by the pressure generated by foaming in the foaming process to generate a retreating problem; after the product is foamed and opened, the air bag support product has rebound condition and protruding problem on the surface of the instrument board product.

Improvements in product design and process have been made to address the above-described problems and the different aspects of the problems that occur.

Since the quality of the instrument panel skeleton largely determines the quality of the instrument panel end product, the structural design of the instrument panel skeleton is improved. As shown in fig. 3 and 4, an instrument panel skeleton comprises an instrument panel skeleton body 1 provided with an airbag rupture port 11, wherein an airbag bracket 2 is arranged in the airbag rupture port 11, the airbag bracket 2 comprises a frame body 21 surrounded by plates and a breakable panel 22 connected to the outer end of the frame body 21, the edge of the breakable panel 22 circumferentially extends beyond the frame body 21 to form a joint edge 23, a stepped mounting surface is formed on the instrument panel skeleton body 1 corresponding to the edge of the airbag rupture port 11, and the outer surface of the stepped mounting surface 12 gradually rises outwards from the edge circumference of the airbag rupture port 11. The inner surface of the overlap edge 23 is adapted to the stepped mounting surface 12, and the outer surface thereof is a smooth surface. Thus, after the airbag bracket 2 is assembled with the instrument panel skeleton body 1, the frame 21 is inserted into the airbag vent 11, and the breakable panel 22 covers the airbag vent 11. And the surface of the panel 22 is flush with the surface of the instrument panel skeleton body 1 due to the entire stepped mounting surface sinking downward.

Unlike the prior art in which the thickness of the overlapping edge 23 is kept uniform, the structural design of matching the instrument panel skeleton body 1 with the slope transition is adopted only at the edge, and the structure of matching the stepped surfaces is adopted in the embodiment, so that the structural strength of the overlapping parts of the two can be increased, the rigidity of the matching parts is enhanced, and the assembled and matched state of the two is improved. Meanwhile, the step-type matching is tighter, so that foaming materials can be prevented from extruding into gaps of products during foaming, the foaming flash-preventing sealing strip between the two in the traditional assembly structure can be omitted, the process is simplified, and the process cost is reduced.

The stepped mounting surface may be a two-stage or multi-stage step, preferably a two-stage or three-stage step, to balance the fit effect and structural complexity.

As shown in fig. 3 and 4, the stepped mounting surface in this embodiment includes a first mounting step 12a surrounding the airbag break 11, and a second mounting step 12b surrounding the first mounting step 12 a. The inner side of the edge of the overlap edge 23 is thinned to form a fitting step 23a, the edge thinned portion of the overlap edge 23 forms a fitting edge 23b, the fitting edge 23b abuts against the second mounting step 12b to form a first sealing surface, and the fitting step 23a cooperates with the first mounting step 12a to form a second sealing surface. Thus, the first sealing surface and the second sealing surface form a two-stage sealing structure, and foaming materials are prevented from entering the frame body 21 of the air bag support 2 from the lap joint part in the foaming process.

In order to tightly fit the first sealing surface, the inner surface of the fitting edge 23b is in interference fit with the horizontal supporting surface of the second mounting step 12b, and the interference amount is 0.1-0.3 mm.

In order to tightly fit the second sealing surface, at least one ring of circumferential protrusions 12c is integrally formed on the supporting surface of the first mounting step 12a in the horizontal direction, the circumferential protrusions 12c are arranged around the airbag rupture port 11, and the inner surface of the overlap edge 23 falls on the circumferential protrusions 12c, so that a line-surface fit structure is formed, and poor fit caused by surface accuracy problems of surface-surface fit is avoided.

Further, unlike the design that the overlap edge 23 of the airbag bracket 2 is completely flush with the outer surface of the instrument panel skeleton body 1, in this embodiment, in order to prevent the edge of the airbag bracket 2 from warping and deforming upwards beyond the outer surface of the instrument panel skeleton body 1, the overlap edge 23 includes an edge portion of the bonding edge 23b, that is, a portion of the outer surface of the overlap edge 23 near the edge thereof is an inclined surface, the bonding edge 23b is lower than the surface height of the instrument panel skeleton body 1 around the second mounting step 12b, the difference in height between the two is d, and the d takes a value of 0.3mm to 0.6mm.

In one embodiment, the edge of the attaching edge 23b is sunk into the surface of the instrument panel skeleton body surface 1 near the edge of the attaching edge 23b by about 0.5mm so as to absorb the deformation error of the part, avoid the problem that the attaching edge 23b is higher than the instrument panel skeleton body 1 beside the attaching edge after assembly, and further reduce the possibility of uneven surface of the product after foaming.

The minimum thickness of the edge of the bonding edge 23b is 1.2-2 mm, and the width of the bonding edge 23b is 3-8 mm. The width of the joint edge 23 is 40-70 mm, and is wider than the joint edge 23 of the traditional air bag bracket 2.

In addition, the air bag support 2 can be made of thermoplastic polyolefin elastomer materials, for example, the material with the product number VP 50DN LC is selected for injection molding, the flexural modulus of the cured material reaches 400MPa and above, preferably 400-450 MPa, and is higher than that of the common material with the flexural modulus of 350MPa, so that the strength and the rigidity of the air bag support are improved, the deformation problem of the foamed product after demolding and before and after assembly is further reduced, and the probability of controlling uneven surface of the instrument board framework finally is reduced.

On the joint structure, bag installing port 11 edge connection has limiting plate 13, and this limiting plate 13 is located instrument board skeleton body 1 inboard, the framework 21 circumference outer wall is equipped with anticreep buckle 24, and this anticreep buckle 24 supports against limiting plate 13 is in order to prevent airbag support 2 deviate from the gasbag burst port 11.

In addition to structural design and materials, improvements are made from the point of view of the molding process.

A method of controlling the flatness of the exterior surface of an instrument panel, the instrument panel comprising an instrument panel skeletal structure as described above, the method comprising: respectively molding the instrument panel skeleton body 1 and the air bag support 2, mounting the air bag support 2 on the instrument panel skeleton body 1 to form an instrument panel skeleton, then integrally mounting the instrument panel skeleton and the air bag support on an upper die of a foaming die, mounting the slush molding skin 32 on a lower die inner cavity of the foaming die, and paving the slush molding skin 32, wherein vacuum with certain pressure is used for adsorbing the slush molding skin 32 through a vacuum hole for convenient fixation; then closing the mold, forming a foaming cavity between the instrument panel framework and the slush molding skin 32, injecting foaming materials into the foaming cavity to generate foaming reaction, and forming a foaming layer 31 between the slush molding skin 32 and the instrument panel framework after curing, wherein the foaming layer 31 is bonded with the slush molding skin 32 and the outer surface of the instrument panel framework at the same time, as shown in fig. 10; and releasing vacuum after the foaming molding is finished, and finally demolding to obtain the instrument panel. Wherein, the foaming mould is provided with the slider subassembly 4 corresponding to gasbag support position.

As shown in fig. 7 to 9, the slider assembly 4 includes a slider 41, the slider 41 is used for abutting against the inner cavity of the frame 21, the slider 41 is connected with a guide mechanism 42 and a locking driving mechanism 43, the locking driving mechanism 43 is used for driving the slider 41 to move between a molding position and a demolding position along the guiding direction of the guide mechanism 42, and when the slider 41 is located at the molding position, the locking driving mechanism 43 prevents the slider 41 from retreating under foaming pressure. The molding and demolding positions define the travel of the slides 41 into and out of the mold cavity. The locking drive mechanism 43 is always in the molding position during the foam molding process of the foam layer 32. It will be readily appreciated by those skilled in the art that the anti-rollback described herein is not a constant position in absolute terms, but rather has a minimum amount of rollback, preferably within 0.1 mm. The traditional slider actuating mechanism is the cylinder, drives the slider business turn over mould die cavity through the flexible of cylinder pole. However, at higher foaming pressures, the cylinder rod may retract, and the present utility model corrects this problem.

In this embodiment, the locking driving mechanism 43 includes a linear telescopic mechanism 43a, a first link 43b and a second link 43c, and the ends of the first link 43b and the second link 43c are hinged to each other and connected between the slider 41 and a first fixing seat 43d located behind the slider 41. A second fixing seat 43e is arranged outside the connecting line of the first connecting rod 43b and the second connecting rod 43c, one end of the linear telescopic mechanism 43a is hinged with the second fixing seat 43e, and the other end is hinged with the hinge point of the first connecting rod 43b and the second connecting rod 43 c. The first fixing seat 43d and the second fixing seat 43e are both fixed to the die holder.

When the slider 41 is positioned at the molding position, the first link 43b and the second link 43c are positioned on the same straight line, and the linear expansion mechanism 43a is perpendicular to the straight line, thereby self-locking. According to the force analysis, when the linear expansion mechanism 43a is perpendicular or nearly perpendicular to the first link 43b and the second link 43c, the linear expansion mechanism 43a only needs a small pushing force to make the slider 41 bear a great pressure, and the expansion pressure is almost unlikely to shrink the linear expansion mechanism 43a during the expansion molding of the air bag bracket 2. During debugging, it is preferable to ensure that the first link 43b and the second link 43c are as close to straight lines as possible in the state where the slider 41 is located at the molding position, and the angle formed by the two links is not more than 1 ° from the design angle.

The linear expansion mechanism 43a may use various conventional mechanical devices. For convenience in control, the linear telescopic mechanism 43a in this embodiment is an air cylinder, the housing of the air cylinder is hinged to the first fixing seat 43d, and the extending end of the piston rod of the air cylinder is hinged to the hinge point of the first connecting rod 43b and the second connecting rod 43 c.

The guide mechanism 42 comprises two guide rods 42b, the two guide rods 42b are connected to the tail end of the sliding block 41 in parallel, two fixed blocks 32a are arranged on the die, and one guide rod 42b is movably arranged on each fixed block 32a in a penetrating mode. The second connecting rod 43c is connected to the middle part of the tail end surface of the sliding block 41, and two guide rods 42b are respectively positioned at two sides of the second connecting rod 43c to keep balance when the sliding block 41 moves.

Finally, it should be noted that the above description is only a preferred embodiment of the present utility model, and that many similar changes can be made by those skilled in the art without departing from the spirit and scope of the utility model as defined in the appended claims.

Claims (6)

1. The utility model provides an instrument board, includes instrument board skeleton, and the surface cladding of this instrument board skeleton has soft inner liner (3), instrument board skeleton is including instrument board skeleton body (1) of seting up gasbag rupture port (11), install gasbag support (2) in gasbag rupture port (11), this gasbag support (2) include framework (21) that the board encloses and connect breakable panel (22) at this framework (21) outer end, the edge circumference of breakable panel (22) extends beyond part formation overlap limit (23) of framework (21), its characterized in that: a stepped mounting surface (12) is formed on the instrument board framework body (1) corresponding to the edge of the airbag explosion port (11), and the outer surface of the stepped mounting surface (12) gradually rises outwards from the periphery of the airbag explosion port (11);

the inner surface of the overlap edge (23) is matched with the stepped mounting surface (12), and the outer surface of the overlap edge is a smooth surface;

the breakable panel (22) is flattened with the outside of the instrument panel skeleton body (1) so as to form the outer surface of the instrument panel skeleton.

2. An instrument panel according to claim 1, wherein: the lining layer (3) comprises an upper slush molding skin (32) and a lower foaming layer (31), wherein the foaming layer (31) is adhered to the outer surface of the instrument panel framework, so that the slush molding skin (32) is flatly adhered to the instrument panel framework.

3. An instrument panel according to claim 1 or 2, wherein: the stepped mounting surface comprises a first mounting step (12 a) surrounding the airbag rupture port (11), and a second mounting step (12 b) surrounding the first mounting step (12 a);

the inner side of the edge of the overlap edge (23) is thinned to form a fitting step (23 a), and the edge thinned part of the overlap edge (23) forms a fitting edge (23 b);

the attaching edge (23 b) is attached to the second mounting step (12 b) to form a first sealing surface, and the attaching step (23 a) is matched with the first mounting step (12 a) to form a second sealing surface.

4. An instrument panel according to claim 3, wherein: the first mounting step (12 a) is positioned on a supporting surface in the horizontal direction, at least one circle of annular protrusions (12 c) is integrally formed, the annular protrusions (12 c) are arranged around the airbag explosion opening (11), and the inner surfaces of the overlap edges (23) fall on the annular protrusions (12 c).

5. An instrument panel according to claim 3, wherein: the outer surface of a part of the overlap edge (23) close to the edge of the overlap edge is an inclined surface, the height of the overlap edge (23 b) is lower than the surface height of the instrument panel framework body (1) around the second installation step (12 b), the height difference of the overlap edge and the instrument panel framework body is d, and the value of d is 0.3-0.6 mm;

the inner surface of the attaching edge (23 b) is in interference fit with the horizontal supporting surface of the second mounting step (12 b), and the interference is 0.1-0.3 mm.

6. An instrument panel according to claim 5, wherein: the minimum thickness of the edge of the bonding edge (23 b) is 1.2-2 mm, and the width of the bonding edge (23 b) is 3-8 mm;

the width of the lap joint edge (23) is 40-70 mm.

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