JP2006137363A - Bumper device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize enhancement of commodity property by mounting a cover member to an opening end surface of a bumper body with no rattling (play) state. <P>SOLUTION: In the bumper device for the vehicle, an opening of the bumper body 10 is closed by mounting the cover member 20 made of synthetic resin provided with a bottom wall 20e opposed to an end surface 11 of an opening end and a peripheral wall covering an outer wall near the opening end of the bumper body to the opening end of the bumper body 10 comprising a metal pipe by inserting respective rivets 30, 31 to respective rivet mounting holes 20a1, 20c1 provided on a peripheral wall and the bumper body. Projections 21-24 capable of interfering to the end surface 11 of the bumper body 10 are provided near corner parts of the peripheral wall and the bottom wall 20e of the cover member 20. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a bumper device for a vehicle, in which an opening end portion of a bumper body of a bumper device provided on the rear, side or front of a truck is covered with a cover member made of synthetic resin.

  2. Description of the Related Art Conventionally, as a rear intrusion prevention device (hereinafter also referred to as “bumper device”) attached to the rear portion of a truck chassis, for example, there is one described in Japanese Patent No. 3040924 (Patent Document 1). The bumper device described in this publication has a U-shaped vertical cross section, and prevents a passenger car or the like having a low vehicle height from entering. However, since the rigidity of the U-shaped cross-sectional structure is small, this can be dealt with by using a bumper body having a rectangular vertical cross section. In that case, a cover member made of a synthetic resin is put on the opening end of the bumper to cover the bumper, thereby improving the appearance and improving the merchantability.

By the way, the bumper device to which such a cover member is attached is a square pipe (structural square steel pipe) having a predetermined height and width as shown in FIGS. At the opening ends 02 on the left and right sides of the direction (shown on the left opening end in FIG. 8), a box-shaped synthetic resin cover member 03 having a predetermined thickness is provided with an upper wall 04 and a lower wall 05. Are attached to the bumper body 01 by inserting rivet mounting holes 06 and 06 rivets 08 provided on the bumper body 01. In addition, the wall forming the entire circumference of the cover member 03 has a relief gradient necessary for the surface to be dented. Further, ribs 012 (4 locations in total) are provided inside the cover member 03 at the corners of the bottom wall 09 and the upper wall 010, and the bottom wall 09 and the lower wall 011. When pushing into the bumper main body 01, the rib 012 performs a stopper function to contact the opening end 02 of the bumper main body 01. Therefore, when the rib 012 hits the opening end 02, the rivet mounting holes 06 and 06 on the cover member 03 side are positioned in the rivet mounting holes (not shown) on the bumper main body 01 side so that the rivet 08 can be easily inserted. I have to. Thus, the cover member 03 is attached to the bumper body 01 via the rivet 08 as shown in FIG. Reference numeral 07 denotes a drain hole.
Japanese Patent No. 3040924

  However, in the conventional apparatus, both the bumper body 01 and the cover member 03 have large dimensional tolerances (hereinafter also referred to as “tolerances”) at the time of manufacture. For this reason, when the tolerances of the respective parts are stacked, the so-called backlash (play, M2) between the cover member 03 and the bumper body 01 is inevitably M1 in the vehicle longitudinal direction and M2 in the vehicle width direction when the assembly is completed. Gap). As a result, the cover member 03 swings around the rivet 08 as a center of rotation, and comes into contact with the bumper body 01 to generate a rattling sound, which may significantly reduce the merchantability.

  As a countermeasure against this problem, the applicant sets the tolerance of the bumper body 01 to a strict condition, for example, within a range of 3 mm to 2 mm, and at the same time, the escaping slope A for the cover member 03 is stricter than that of the current situation. A bumper body and a cover member were set as prototypes that were set so that the tolerance was tightly closed to the limit value at a small angle and other parts. As a result of investigating the backlash amount of the bumper device assembled with the prototype, the backlash amount M1 in the front-rear direction can be significantly reduced to a quarter. Thus, although the desired amount of play can be reduced, the amount of play still exists, so that the cover member 03 can rotate around the rivet 08 as the center of rotation. For this reason, there was a problem that the cover member emits a rattling sound with the bumper body.

  The present invention has been devised to solve the above-mentioned problems, and is provided in the direction of the relief slope of the front wall and the rear wall provided in the vicinity of each corner of the peripheral wall and the bottom wall inside the cover member. A small vehicle entry prevention device for a truck that can improve the merchantability of the bumper body by preventing the play of the cover member from rattling (play) by interfering with the triangular protrusion in the cross section of the bumper body. The purpose is to obtain.

  Therefore, the following measures are taken in the present invention. In other words, the bumper device for a vehicle according to the first aspect of the present invention includes a peripheral wall that covers an opening end of a bumper body made of a metal pipe, a bottom wall facing the end surface of the opening end, and an outer wall near the opening end of the bumper body. A vehicular bumper device that closes the opening of the bumper body by inserting the rivet through the rivet mounting hole provided in the peripheral wall and the bumper body. And the protrusion part which can interfere with the end surface of the said bumper main body was provided in the corner part vicinity of the said surrounding wall and the said bottom wall of the said cover member, It is characterized by the above-mentioned.

According to a second aspect of the present invention, there is provided the vehicle bumper device according to the first aspect, wherein the bumper body is formed in a rectangular shape in the longitudinal section, while the cover member is formed on the outer wall surface near the opening end of the bumper body. When the rivet that is formed in a box shape including a peripheral wall and a bottom wall that are covered along the four walls and fastens one of the two opposing walls of the peripheral wall and the bumper is attached, at least the peripheral wall The protrusion is provided in the vicinity of the corner between the other two opposite walls and the bottom wall.

According to a third aspect of the present invention, there is provided the vehicle bumper device according to the first or second aspect, wherein the protruding portion has a pedestal portion and a cross-section that narrows from the pedestal portion toward the opening end of the cover member. It is characterized by the fact that it is formed with ribs that form triangular protrusions.

According to a fourth aspect of the present invention, there is provided the vehicle bumper device according to the first or second aspect, wherein the protrusion is formed in a triangular cross-section that is tapered toward the cover member opening end. It is characterized by that.

According to a fifth aspect of the present invention, there is provided the vehicle bumper device according to the first or second aspect, wherein the protruding portion is a pedestal portion and a sawtooth shape projecting from the pedestal portion toward the cover member opening end. It is characterized by being formed with the protrusions.

According to a sixth aspect of the present invention, there is provided the vehicle bumper device according to the first or second aspect, wherein a pedestal portion capable of interfering with an opening end of the bumper main body is provided inside the cover member peripheral wall, and on the pedestal portion. In addition to being formed, a protrusion having a triangular cross section oriented in a direction along the peripheral wall is provided.

According to the vehicle bumper device of the first aspect of the present invention, the bumper device can be deformed by interfering with the end surface of the bumper body in the vicinity of the corner portion between the peripheral wall and the bottom wall of the cover member formed by molding the synthetic resin material. Since the projections are provided, the cover member can be easily attached to the bumper body in a short time without play (play). That is, the cover member is pushed into the opening end of the bumper body. When the protruding portion interferes with the end face of the opening end of the bumper main body and is pushed in while deforming the protruding portion, the rivet mounting holes provided in the peripheral wall of the cover member substantially coincide with the rivet mounting holes provided in the bumper main body. When the rivet is inserted and coupled to each rivet mounting hole in this positioned state, the cover member can be fixed to the bumper body opening end without any play. Thus, by attaching a synthetic resin cover member having a peripheral wall to the opening end of the bumper body having a dimensional tolerance, even if a rotational force with the rivet as the rotation center is applied to the cover member, the cover member Since the protrusion provided in the vicinity of the corner between the peripheral wall and the bottom part engages with the bumper body opening end while interfering with it, the cover member is fixed to the bumper body without play. Will be. As a result, when mounting parts that are manufactured so as to minimize the tolerance generated in the production of the cover member and the bumper body, the backlash that still exists interferes with the protrusions according to the backlash amount. By making it absorbable, it is possible to obtain a bumper device for a vehicle with excellent merchantability that does not generate rattling noise. In addition, since it is not necessary to change the molding die of the cover member significantly, it is possible to realize a vehicle bumper device that is inexpensive to manufacture.

According to the invention described in claim 2, while the bumper body is formed in a rectangular shape in the longitudinal section, the peripheral wall and the bottom wall formed by four walls covering the cover member along the outer wall surface near the opening end of the bumper body. When the rivet that is formed into a box shape and fastens one of the two opposing walls of the peripheral wall and the bumper is attached, at least each of the other two opposing walls of the peripheral wall and the bottom wall Since the protrusion is provided in the vicinity of the corner portion, when a box-shaped cover member is attached to the opening end of the bumper body having a quadrangular longitudinal section, the cover member can be easily fitted (pressed) into the bumper body. , You will be able to improve work efficiency.
In addition, it is possible to increase the dimensional tolerance within a range that does not interfere, and the manufacturing cost of the bumper and the cover member can be reduced.

  According to the invention described in claim 3, since the projecting portion is formed by the pedestal portion and a rib having a triangular ridge whose cross section becomes narrower from the pedestal portion toward the opening end of the cover member. When the cover member is pushed into the bumper body opening end, only the triangular ribs are crushed to the end surface of the bumper body opening end while absorbing the tolerance variation of each member. Further, when the height dimension of the rib is formed large, the tip end portion of the rib interferes with the bumper body opening end and elastically deforms. Furthermore, even when the backlash is large and the ribs are completely crushed, the cover member can be pushed in by the pedestal, so that the cover member can be attached to the bumper body without any backlash. As described above, since the ribs are crushed or elastically deformed to interfere with each other, the cover member can be mounted and fixed in a stable state without any play in the bumper body.

  According to the invention of claim 4, the entire protrusion is formed in a triangular cross-section that rises from the vicinity of the corner of the peripheral wall and the bottom wall and has a concavity in the direction toward the cover member opening end. In addition, the cover member can be attached in a state where the vicinity of the tip of the protrusion is crushed by the end surface of the opening end of the bumper body, or is not deformed while being deformed. As a result, it is not necessary to manufacture a complicated mold for forming ribs on the pedestal as in the third aspect of the invention, and it is only necessary to form the protrusion itself in a simple triangular shape. This is advantageous for cost reduction.

  According to the invention of claim 5, the protrusion is formed by the pedestal and the sawtooth-shaped protrusion protruding from the pedestal toward the opening of the cover member. It is not necessary to apply a large surface pressure, and the protrusion can be easily deformed while interfering with the bumper body. For this reason, it is possible to easily attach the cover member without looseness with a small pushing force, and to improve the attachment workability.

  Further, according to the invention described in claim 6, unlike the protrusions in the inventions of claims 3 to 5, the bumper main body is formed on the base portion inside the peripheral wall so as to be able to interfere with the opening end of the bumper body. In addition, a protrusion having a triangular cross-sectional surface is provided in the direction of the cover opening end and along the peripheral wall surface. For this reason, when the cover member is fitted over the bumper body opening end, the bumper body opening is either seated on the pedestal or contacted at any point in the depth direction of the ridge depending on the amount of play present. Thus, interference occurs while deforming or scraping the tip of the ridge. As a result, it is possible to satisfactorily absorb backlash with respect to the bumper body when the cover member is attached, and it is possible to realize a vehicle bumper device that is free of backlash and has excellent merchantability.

  Hereinafter, a first embodiment when the present invention is applied to a rear bumper device will be described in detail with reference to FIGS. Note that the arrow F in FIGS. 1B and 2A is defined as the forward direction of the truck (the traveling direction of the vehicle), and the arrow U in FIGS. 1A and 2C is defined as above the truck. . Moreover, it is needless to say that the dimensions in the respective parts shown below are merely examples and are not limited to these numerical values. That is, the bumper device includes a bumper body 1 and a box-shaped cover member 20 provided so as to cover the opening ends of the bumper body 10 at both ends in the vehicle width direction via push-type synthetic resin rivets 30 and 31. Consists of. Bumper body 1 is a steel pipe whose longitudinal cross section is rolled into a square shape, and its tolerance is stricter than JIS standards, and it is manufactured with tolerances that are close to the limit and infinitely smaller than those of conventional products. Is used. And the end surface 11 in the opening end of the bumper main body 10 forms the surface cut in the surface orthogonal to the longitudinal direction axis line L along the vehicle width direction of a truck. Of course, an aluminum metal pipe may be used instead of the steel pipe.

  The cover member 20 is a box type that can cover the outer surfaces of the upper surface 10a, the front surface 10b, the lower surface 10c, and the rear surface 10d of the bumper body 10 by resin molding using a synthetic resin material such as polypropylene. It is formed into a shape. A protrusion 21 is provided on the bottom wall 20e of the cover member 20. When the cover member 20 is put on the bumper body 10, it can be pushed in until it interferes with the protrusion 21 (see FIG. 1B). .

  The basic form of the cover member 20 will be further described in detail with reference to FIGS. The cover member 20 includes a bottom wall 20e facing the end surface 11 at the opening end of the bumper body 10, an upper wall 20a facing the upper surface 10a of the bumper body 10, a front wall 20b facing the front surface 10b, and a lower surface 10c. A peripheral wall composed of a facing lower wall 20c and a rear wall 20d facing the rear surface 10d is provided, and the overall shape is thus formed in a box shape that covers the opening end of the bumper body 10. The outer surface of the cover member 20 is subjected to graining so as to exhibit a matte appearance. For this purpose, each wall 20a to 20d is formed with a clearance gradient α in a predetermined angle range (see FIG. 1B).

In addition, the cover member 20 is provided with projections 21, and the projections 21 are provided at the four corner portions near the four corners of the other two opposite walls, the front wall 20 b and the rear wall 20 d, and the continuous bottom wall 20 e. And is formed so as to be able to interfere with the end surface 11 of the bumper body 10. The projecting portion 21 is formed by a pedestal portion 21a and a rib 21b that has a triangular cross-section projecting upward from the pedestal portion 21a. For example, as shown in FIG. 3, the shape and size of the protrusion 21 in the present embodiment are as follows: the height of the base member 21a is L1 (tolerance is within a predetermined range), the width is L2, the inclination angle is θ, and the rib 21b is The height is set to L3, and the width of the base is set to L4. The rib height dimension L3 has a designed interference amount range up to a certain range of 0 or more, but the interference amount during normal assembly is an interference amount that can absorb a minimum amount from a maximum amount of a predetermined tolerance. Is assumed. Therefore, when the cover member 20 is assembled into the bumper body 10, the rib 21b is crushed and interfered by the end surface 11 of the bumper body 10 to absorb backlash. For this reason, even when the backlash is large and the rib 21b is completely crushed to 0 mm, the pedestal 21a is prevented from entering the end face 11 and received.
Further, in the present embodiment, as shown by a broken line in FIG. 2A, the rib 21a is separated from the wall surfaces 20b and 20d of the peripheral wall so as to be easily deformed. Depending on the shape, it may be connected to the peripheral walls 20b and 20d.

Also, mounting holes 20a1 and 20c1 for inserting the rivets 30 are provided in the upper wall 20a and the lower wall 20c, which are one opposing two walls of the cover member 20. The inner diameters of these holes are the same, and the tolerance is set within a predetermined range. As shown in FIG. 1B, the mounting hole position dimension L5 from the bottom wall 20e to the center of the mounting holes 20a1 and 20c1 is set to have a predetermined tolerance. Furthermore, as shown in FIG. 1A, the dimension L6 from the end surface 11 of the opening end on the bumper body 10 side to the position of each rivet mounting hole is also set to a position having a predetermined tolerance range.
Note that reference numerals 20a2 and 20c2 in FIG. 2 denote drain holes.

  Next, attachment of the cover member 20 will be described. That is, in order to form the bumper main body 10 and the cover member 10 with dimensions and their tolerances set to be as small as possible, the cover member 20 is formed in the direction indicated by the arrow X in FIG. 11, the end surface 11 is seated while interfering with the rib 21 b of the protrusion 21. That is, when the cover member 20 is pushed in, the rivet mounting holes on the bumper body side and the rivet mounting holes 20a1 and 20c1 on the cover member side substantially coincide with each other. At the same time, the rib 21b is crushed by a certain amount of interference (0 or more and within a predetermined range) while absorbing the tolerance variation. As a result, by inserting the rivets 30 and 31 into the rivet attachment holes, the cover member 20 can be attached to the bumper body 10 without any play.

  As described above, according to the present embodiment, even when a rotational external force with the rivet 30 as the rotation center acts on the cover member 20, the rib 21b of the protruding portion 21 of the cover member 20 is free from backlash. Therefore, the cover member 20 can be stably fixed to the bumper body 10. Therefore, it is possible to obtain a bumper device that can be attached without play and has excellent merchantability and does not emit a rattle by a simple operation of pushing into the end face 11 at the opening end of the bumper body 10.

  In the above embodiment, the height of the rib 21b is set to L3. However, as in the first modification shown in FIG. 4, the height is set to a height that is twice the size of L3 on the pedestal portion 22a. You may form in the projection part 22 provided with the prepared rib 22b. In this case, at least a portion of the rib 21b is not connected to the inner surface of the peripheral wall. By doing in this way, since the front-end | tip part of the rib 22b pressed on the end surface 11 of the opening end of the bumper main body 10 becomes easy to be elastically deformed as shown with a broken line, it is the difference of the tolerance which a cover member and a bumper main body have. Can be absorbed smoothly, and as a result, the same effects as in the first embodiment can be obtained.

  Further, as in the second modification shown in FIG. 5, the projecting portion 21 is not provided with the pedestal portion 21a as in the first embodiment, and the entire projecting portion 23 is erected from the bottom wall 20e. It is also possible to configure in a form having a triangular rib shape with a pointed tip in the X direction toward the opening end of the main body. In this case, the protrusion 23 is not connected to the inner surface of the peripheral wall. According to the second modification, the vicinity of the tip of the protrusion is crushed by the end surface 11 at the opening end of the bumper body (see FIG. 5B), or is flexibly elastically deformed to absorb the variation in tolerance. However, the cover member can be attached in a state where there is no backlash. Therefore, according to the second modified example, since the projecting portion 23 has a simple shape, the manufacturing cost of the mold can be reduced, and the manufacturing cost of the cover member 20 can be greatly reduced.

  Further, as in a third modification shown in FIG. 6, a sawtooth-shaped rib 24 b may be formed on the pedestal portion 24 a of the protrusion 24 as viewed in a plan view. By adopting such a configuration, the cover member 20 can be stably attached without any play by crushing the ribs 24b or elastically deforming them without requiring a large pushing force as shown in FIG. 6C. Will be able to. Therefore, according to the third modified example, the pushing force of the cover member 20 can be small, so that there is an advantage that the fatigue level of the operator can be reduced accordingly.

  Next, a fourth modification shown in FIG. 7 will be described. In the fourth modified example, the ridge 41 is provided on the inner side of the front wall 40b and the rear wall 40d, which are the other two opposing walls of the peripheral wall of the cover member 40, on the pedestal part 41f that interferes with the opening end of the bumper body. Features a point. That is, the protrusion 41 is continuously provided on the pedestal portion 40f up to the opening end of the cover member 40 so as to be directed in a direction substantially along the inner side of the front wall 40b and the rear wall 40d, and has a triangular cross section. It is what is formed. For this reason, when the cover member 40 is pushed into the opening end of the bumper body 10, the end surface 11 at the opening end of the bumper body 10 starts to interfere with the protrusion 41 near the bottom wall 40e. At this time, the cover member 40 penetrates into the ridge and enters while cutting the ridge, and the end surface 11 at the open end is engaged so as to be seated on the pedestal portion 40f. Therefore, according to the fourth modified example, it becomes possible to attach the cover member 40 to the bumper main body without any backlash while absorbing the tolerance variation in substantially the same manner as in the first embodiment. As a result, it is possible to realize a bumper device that is free of backlash and has excellent merchantability.

As mentioned above, although embodiment of this invention and its 1st modification thru | or the 4th modification were explained in full detail with drawing, specific structure is not restricted to these embodiment, The summary of this invention Any design change or the like within a range that does not deviate from the above is included in the scope of the present invention.
For example, in the above-described embodiment and each of the modified examples thereof, the case where the bumper device is applied to a rear bumper that is a rear entry preventing device for a truck has been described, but the side bumper device provided on the side surface of the vehicle or the front surface of the vehicle Of course, it can be applied to the front bumper provided in
Further, the bumper body has a rectangular shape in the longitudinal section, but it goes without saying that the bumper body can also be applied to a metal pipe having an appropriate sectional shape such as a circular shape, that is, a round pipe shape or a trapezoidal shape.

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram which shows the outline | summary of the rear part rush prevention apparatus of the truck in embodiment of this invention, (a) The side view seen from back, (b) is the enlarged plan view which looked at (a) from the top. It is detail drawing of the cover member in embodiment, (a) is a top view, (b) is a front view, (c) is a right view of (b). It is the elements on larger scale which showed the principal part in the A section of FIG. 2 in the partial cross section. FIG. 4A is a partially enlarged view similar to FIG. 3 and FIG. 4B is an explanatory diagram for explaining the operation according to a first modification of the embodiment. In connection with the second modification of the embodiment, (a) is a partially enlarged view, and (b) is an operation explanatory view. (A) is a plan view similar to (a) of FIG. 2, (b) is an enlarged view of part B of (a), and (c) is an explanatory diagram of operation according to a third modification of the embodiment. is there. It is an external appearance perspective view of the cover member in the 4th modification of embodiment. It is a bumper apparatus in a conventional apparatus, Comprising: It is a top view explaining the attachment state of a bumper main body and a cover member. The cover member in a conventional apparatus is shown, (a) is a top view, (b) is the side view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Bumper body 11 End surface of bumper body opening end 20 Cover member 20a Upper wall of cover member 20b Front wall of cover member 20c Lower wall of cover member 20d Rear wall of cover member 20e Bottom wall of cover member 20a1, 20c1 Mounting holes for rivets 21 Protruding part 21a Pedestal part 21b Rib 22 Protruding part 22a Pedestal part 22b Rib 23 Protruding part
24 Projection part 24a Base part 24b Rib 30, 31 Rivet 40 Cover member 40a Upper wall of cover member 40b Front wall of cover member 40c Lower wall of cover member 40d Rear wall of cover member 40e Bottom wall of cover member 41 Projection 41f Base Part F Track forward direction L Track rear entry prevention device U Track upward direction α Clearance

Claims (6)

  A synthetic resin cover member having a bottom wall facing the end surface of the bumper body made of a metal tube and a peripheral wall covering an outer wall in the vicinity of the bumper body opening end, and the peripheral wall and the bumper. A bumper device for a vehicle that closes the bumper body opening by inserting and attaching each rivet to each rivet mounting hole provided in the body, in the vicinity of a corner portion of the peripheral wall and the bottom wall of the cover member Further, a bumper device for a vehicle, characterized in that a protrusion capable of interfering is provided on an end surface of the bumper body. The bumper body is formed in a rectangular shape with a vertical cross section, while the cover member is formed in a box shape including a peripheral wall and a bottom wall formed by four walls covering the outer wall surface in the vicinity of the bumper body opening end, When the rivet that fastens one opposing two walls of the peripheral wall and the bumper is attached, the protrusion is provided at least near the corner portion of the other opposing two walls of the peripheral wall and the bottom wall. The bumper device for a vehicle according to claim 1.   The said protrusion part was formed with the base part and the rib which the cross section which becomes thin toward the said cover member opening end direction from the said base part forms a triangular-shaped protrusion, The Claim 1 or 2 characterized by the above-mentioned. Bumper device for vehicles.   The bumper device for a vehicle according to claim 1, wherein the protruding portion is formed in a triangular cross section that is tapered in a direction toward the opening end of the cover member.   3. The vehicle bumper device according to claim 1, wherein the protrusion is formed by a pedestal and a sawtooth-shaped protrusion protruding from the pedestal toward the opening of the cover member. 4. A pedestal portion capable of interfering with the bumper body opening end and a ridge having a triangular cross section oriented on the direction along the peripheral wall are provided on the inner side of the cover member peripheral wall. The bumper device for a vehicle according to claim 1, wherein the bumper device is a vehicle bumper.

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