CN114228648A - Guard bar assembly - Google Patents
Guard bar assembly Download PDFInfo
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- CN114228648A CN114228648A CN202111469731.7A CN202111469731A CN114228648A CN 114228648 A CN114228648 A CN 114228648A CN 202111469731 A CN202111469731 A CN 202111469731A CN 114228648 A CN114228648 A CN 114228648A
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- cross
- section
- guard
- variable cross
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 6
- 239000010959 steel Substances 0.000 claims abstract description 6
- 238000013461 design Methods 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 230000001681 protective effect Effects 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 230000002349 favourable effect Effects 0.000 description 4
- 230000006978 adaptation Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R19/00—Wheel guards; Radiator guards, e.g. grilles; Obstruction removers; Fittings damping bouncing force in collisions
- B60R19/02—Bumpers, i.e. impact receiving or absorbing members for protecting vehicles or fending off blows from other vehicles or objects
- B60R19/023—Details
Abstract
The invention relates to the technical field of automobile manufacturing, and discloses a guard bar assembly which comprises a guard cross bar, a first support and a second support, wherein the first support and the second support are fixedly connected with the guard cross bar, the guard cross bar is made of hollow steel pipes with rectangular cross sections, the guard cross bar comprises a first variable cross section, a second variable cross section, a third variable cross section and a fourth variable cross section which are sequentially arranged from one end to the other end of the guard cross bar, the cross section areas of the first variable cross section and the third variable cross section are gradually increased, the cross section areas of the second variable cross section and the fourth variable cross section are gradually reduced, and any cross section of each variable cross section is arranged in a rectangular shape. Compared with the prior art, the guard bar assembly optimizes the structural design of the guard cross bar, reduces the structural dead weight and the occupied space of the guard cross bar while ensuring the equal strength of each part of the guard cross bar, meets the light-weighted requirement of a commercial vehicle, and reduces the manufacturing cost of the guard bar assembly.
Description
Technical Field
The invention relates to the field of automobile manufacturing, in particular to a guard bar assembly.
Background
With the improvement of the living standard of people, the automobile is popularized as a common transportation tool, more and more families start to purchase the automobile, and with the increase of users, the safety problem of the automobile is more and more widely concerned by the public.
Guard bars are installed at the front lower part and the rear lower part of a vehicle body as safety parts of the vehicle, and are key parts in vehicle manufacturing. At the present stage, the guard bars of most commercial vehicles are of uniform-section rectangular tubes or variable-thickness rectangular tubes, and although the uniform-section rectangular tubes can meet the use requirements, the strength of partial regions is surplus, so that the guard cross bars are heavier in weight and higher in manufacturing cost; the variable-thickness rectangular tube realizes the concept of equal strength, but the current process is still difficult to realize.
Disclosure of Invention
In order to solve the above technical problems, an object of the present invention is to provide a guard bar assembly having the advantages of uniform strength of the whole bar, avoidance of surplus strength of a part, and good light weight.
Based on the above, the invention provides a guard bar assembly, which comprises a guard cross bar, wherein the guard cross bar is made of a hollow steel pipe with a rectangular cross section, and comprises a first variable cross section, a second variable cross section, a third variable cross section and a fourth variable cross section which are sequentially arranged from one end to the other end of the guard cross bar, wherein the cross section areas of the first variable cross section and the third variable cross section are gradually increased, the cross section areas of the second variable cross section and the fourth variable cross section are gradually reduced, and any cross section of each variable cross section is rectangular.
In some embodiments of the present application, the protective device comprises a first bracket, and the first bracket is arranged at a joint of the first variable cross-section and the second variable cross-section and is fixedly connected to the protective cross bar.
In some embodiments of the present application, the first bracket is welded or bolted to the guard rail.
In some embodiments of the present application, the shielding cross-bar at the junction of the first variable cross-section and the second variable cross-section extends towards the first variable cross-section and the second variable cross-section, respectively, to form a first uniform cross-section for connecting the first bracket, and the cross-sectional area of the first uniform cross-section remains constant.
In some embodiments of the present application, the protective cross bar further comprises a second bracket, and the second bracket is arranged at a joint of the third variable cross-section and the fourth variable cross-section and is fixedly connected to the protective cross bar.
In some embodiments of the present application, the second bracket is welded or bolted to the guard rail.
In some embodiments of the present application, the shielding rail at the junction of the third variable cross-section and the fourth variable cross-section extends towards the third variable cross-section and the fourth variable cross-section respectively to form a second equal cross-section for connecting the second bracket, and the cross-sectional area of the second equal cross-section is kept constant.
In some embodiments of the present application, the guard rail is welded to the body of the automobile.
In some embodiments of the present application, the height of the cross section of the guard rail is 120mm, and the width of the cross section of the guard rail is 30-80 mm.
The embodiment of the invention provides a guard bar assembly, which has the following beneficial effects compared with the prior art:
the invention provides a guard bar assembly which comprises a guard cross bar, wherein the guard cross bar is made of a hollow steel pipe with a rectangular cross section, the guard cross bar comprises a first variable cross section, a second variable cross section, a third variable cross section and a fourth variable cross section which are sequentially arranged from one end to the other end of the guard cross bar, the cross section areas of the first variable cross section and the third variable cross section are gradually increased, the cross section areas of the second variable cross section and the fourth variable cross section are gradually reduced, and any cross section of each variable cross section is arranged in a rectangular shape. Based on above-mentioned structure, the design theory of equal strength roof beam is adopted in this application, adopt variable cross section's mode design according to the difference of protection horizontal pole different positions atress, increase rigidity in order to reach specific direction, the effect of intensity, particularly at the both ends of protection horizontal pole and adopt little cross-section with the middle part, adopt big cross-section in all the other positions, make the protection horizontal pole avoid the protection horizontal pole to be rich in the intensity of specific position as far as possible when satisfying each part equal strength through using the variable cross section horizontal pole, and then reduce the waste of material, the structure dead weight of protection horizontal pole can be reduced in this kind of design, also be favorable to controlling manufacturing cost. So, this fender rod assembly can comply with commercial car lightweight, low-cost demand, and the adaptation increases rapid commercial car demand, can carry the front lower part protection and back lower part protection on the class of cargo, engineering class, special class commercial car and obtain using, calculates according to the research and calculates and subtract the heavy degree and can reach 10%, and the both ends and the middle part cross-section of protection horizontal pole diminish, are favorable to arranging of other parts, can play certain help effect to improving the occupation space of protection horizontal pole equally.
Drawings
FIG. 1 is a schematic structural view of a guard bar assembly according to an embodiment of the present invention;
FIG. 2 is a top view of a guard rail in an embodiment of the present invention;
FIG. 3 is a schematic diagram of the force applied to the front guard of the guard bar assembly of the present invention;
FIG. 4 is a schematic diagram of the force applied when the guard bar assembly of the present invention is used for rear protection.
In the figure, 1, a guard rail; 11. a first variable cross-section; 12. a second variable cross-section; 13. a third variable cross-section; 14. a fourth variable cross-section; 15. a first constant cross-sectional section; 16. a second equal cross-sectional segment; 2. a first bracket; 3. a second support.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
It should be understood that the terms "front", "rear", and the like are used herein to describe various information, but the information should not be limited to these terms, which are used only to distinguish one type of information from another. For example, "front" information may also be referred to as "rear" information, and "rear" information may also be referred to as "front" information without departing from the scope of the present invention.
As shown in fig. 1 to 4, an embodiment of the present invention provides a guard bar assembly, which includes a guard cross bar 1, where the guard cross bar 1 is made of a hollow steel pipe with a rectangular cross section, and specifically, the guard cross bar 1 includes a first variable cross section 11, a second variable cross section 12, a third variable cross section 13, and a fourth variable cross section 14, which are sequentially arranged from one end to the other end of the guard cross bar, where the cross section areas of the first variable cross section 11 and the third variable cross section 13 are gradually increased, the cross section areas of the second variable cross section 12 and the fourth variable cross section 14 are gradually decreased, and any cross section of each variable cross section is arranged in a rectangular shape.
Based on above-mentioned structure, the design theory of equal strength roof beam is adopted in this application, the mode design of variable cross section is adopted according to the difference of protection horizontal pole 1 different positions atress, in order to reach specific direction increase rigidity, the effect of intensity, particularly adopt little cross-section at the both ends of protection horizontal pole 1 and with the middle part, adopt big cross-section in all the other positions, make protection horizontal pole 1 avoid protection horizontal pole 1 to be abundant in the intensity of particular position as far as possible when satisfying each part equal strength through using the variable cross section horizontal pole, and then reduce the waste of material, the structure dead weight of protection horizontal pole 1 can be reduced in this kind of design, also be favorable to controlling manufacturing cost. So, this fender rod assembly can comply with commercial car lightweight, low-cost demand, and the adaptation increases rapid commercial car demand, can carry the front lower part protection and back lower part protection on the class of cargo, engineering class, special class commercial car and obtain using, calculates according to the research and calculates and subtract the heavy degree and can reach 10%, and the both ends and the middle part cross-section of protection horizontal pole 1 diminish, are favorable to arranging of other parts, can play certain help effect equally to improving the occupation space of protection horizontal pole 1.
Further, in order to optimize the structural design of the protective cross bar 1 and reduce the manufacturing difficulty, in some embodiments of the present application, the lengths of the first variable cross-section 11 and the fourth variable cross-section are equal, the lengths of the second variable cross-section 12 and the third variable cross-section 13 are equal, and the entire protective cross bar 1 is arranged in an axisymmetric manner with the connecting line of the second variable cross-section 12 and the third variable cross-section 13.
Optionally, in some embodiments of the present application, the guard bar assembly further includes a first bracket 2, and the first bracket 2 is disposed at a joint of the first variable cross-section 11 and the second variable cross-section 12 and is fixedly connected to the guard cross bar 1, specifically, in embodiments of the present invention, the first bracket 2 is welded to the guard cross bar 1 or is connected to the guard cross bar 1 by a bolt. The first support 2 of operating personnel accessible further strengthens being connected of protection horizontal pole 1 and automobile body, also can set up other structures on first support 2 and further promote the protective effect of protection horizontal pole 1.
Further, for the first bracket 2 and the shielding cross bar 1 of the present application, since the special-shaped structure of the shielding cross bar 1 can obviously change the local stress condition, in order to achieve the effective connection of the first bracket 2 and the shielding cross bar 1, the shielding cross bar 1 should not be designed with a special-shaped structure with a large variation at the connection between the two to affect the connection effect between the two, in some embodiments of the present application, the cross bar located at the connection between the first variable cross section 11 and the second variable cross section 12 extends towards the first variable cross section 11 and the second variable cross section 12 respectively to form a first uniform cross section 15 for connecting the first bracket 2, and the first uniform cross section 15 is a stable structure with a constant cross section area.
It should be noted that, for the guard bar assembly of the present application, the number of brackets provided is not fixed and unitary, that is, in order to improve the anti-collision effect of the guard bar assembly or the connection effect of the guard cross bar 1 and the automobile body, and the like, two or more than two brackets can be arranged, in the embodiment of the invention, the guard bar assembly further comprises a second bracket 3, the second bracket 3 is arranged at the joint of the third variable cross-section 13 and the fourth variable cross-section 14 and is fixedly connected with the guard cross bar 1, similar to the first bracket 2, the second bracket 3 is connected with the protective cross bar 1 in a welding mode or in a bolt mode, the cross bar located at the joint of the third variable cross section 13 and the fourth variable cross section 14 extends towards the third variable cross section 13 and the fourth variable cross section 14 respectively to form a second equal cross section 16 used for connecting the second bracket 3, and the second equal cross section 16 is also of a stable structure with the constant cross section area.
Furthermore, according to the requirements of the existing implementation specifications, the height of the cross section of the shielding cross bar 1 needs to be greater than or equal to 120mm, the effect of the height direction on the bending resistance modulus of the cross section of the cross bar is the first order of height, and the arrangement position of the front lower shielding cross bar 1 is limited, so the height of the cross section of the general shielding cross bar 1 is preferably 120mm, the connection position of the shielding cross bar 1 with the first support 2 and the second support 3 is the maximum cross section position, the cross section width is preferably 80mm due to limited space, the cross sections of the two ends of the shielding cross bar 1 are the minimum, preferably 30mm, that is, the cross section width of the minimum cross section in each cross section of the shielding cross bar 1 is 30mm, the cross section width of the maximum cross section is 80mm, and the length of the maximum cross section of the shielding cross bar 1 is set to be 100mm and 200mm for the convenience of the connection of the shielding cross section 1 with the first support 2 and the second support 3, that is, the lengths of the first equal cross-section 15 and the second equal cross-section 16 are preferably 100-200mm, and the length of the whole protective cross bar 1 can be further confirmed according to the actual use requirement.
In addition, as shown in fig. 3 and 4, the application example of the existing front and rear guard bar assemblies is loaded according to the test loading force and loading direction of the national standard, and the final structure passes the test requirements of the national standard on the points P1, P2 and P3.
As can be seen from fig. 3 and 4, when loads are applied to the crossbar at points P1 (typically 100mm inward from the outermost crossbar) and P3 (the middle crossbar), the crossbar is subjected to bending moments primarily, with the dangerous cross-section at the root of the rack. The crossbars are stressed when a load is applied at point P2 (typically near each rack) which is generally at the rack at the point of risk of the structure when loaded, so the following is a summary of the analysis of points P1 and P3. The stress situation of each stress point of the cross rod is shown in table 1.
TABLE 1 stress situation of each node of the cross bar
| Item | P1 Point load | P2 Point load | P3 Point load | Reference basis |
| Front lower protection device | 80kN | 160kN | 80kN | GB26511 |
| Rear lower part protection device | 50kN | 100kN | 50kN | GB11567 |
In summary, the invention provides a guard bar assembly, which comprises a guard cross bar, and a first support and a second support fixedly connected with the guard cross bar, wherein the guard cross bar is made of a hollow steel pipe with a rectangular cross section, the guard cross bar comprises a first variable cross section, a second variable cross section, a third variable cross section and a fourth variable cross section which are sequentially arranged from one end to the other end of the guard cross bar, the cross section areas of the first variable cross section and the third variable cross section are gradually increased, the cross section areas of the second variable cross section and the fourth variable cross section are gradually decreased, and any cross section of each variable cross section is arranged in a rectangular shape. Compared with the prior art, the guard bar assembly optimizes the structural design of the guard cross bar, reduces the structural dead weight and the occupied space of the guard cross bar while ensuring the equal strength of each part of the guard cross bar, meets the light-weighted requirement of a commercial vehicle, and reduces the manufacturing cost of the guard bar assembly.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (9)
1. A guard bar assembly is characterized by comprising a guard cross bar, wherein the guard cross bar is made of a hollow steel pipe with a rectangular cross section, the guard cross bar comprises a first variable cross section, a second variable cross section, a third variable cross section and a fourth variable cross section which are sequentially arranged from one end to the other end of the guard cross bar, the cross section areas of the first variable cross section and the third variable cross section are gradually increased, the cross section areas of the second variable cross section and the fourth variable cross section are gradually reduced, and any cross section of each variable cross section is rectangular.
2. The guard bar assembly of claim 1, comprising a first bracket disposed at a junction of the first variable cross-section and the second variable cross-section and fixedly connected to the guard rail.
3. The guard bar assembly of claim 2, wherein the first bracket is welded or bolted to the guard rail.
4. The guard bar assembly of claim 3 wherein the guard rail at the junction of the first and second variable cross-sections extends toward the first and second variable cross-sections, respectively, to form a first constant cross-section for connecting the first bracket, the first constant cross-section remaining constant in cross-sectional area.
5. The guard bar assembly of claim 1, further comprising a second bracket disposed at a junction of the third variable cross-section and the fourth variable cross-section and fixedly connected to the guard rail.
6. The guard bar assembly of claim 5, wherein the second bracket is welded or bolted to the guard rail.
7. The guard bar assembly of claim 6 wherein the guard rail at the junction of the third and fourth varied cross-section sections extends toward the third and fourth varied cross-section sections, respectively, to form a second uniform cross-section for connecting the second bracket, the second uniform cross-section remaining constant in cross-sectional area.
8. The guard bar assembly of claim 1, wherein the guard rail is bolted to an automobile body.
9. The guard bar assembly of claim 1, wherein the guard bar has a cross-sectional height of 120mm and a cross-sectional width of 30-80 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111469731.7A CN114228648A (en) | 2021-12-03 | 2021-12-03 | Guard bar assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111469731.7A CN114228648A (en) | 2021-12-03 | 2021-12-03 | Guard bar assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114228648A true CN114228648A (en) | 2022-03-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111469731.7A Pending CN114228648A (en) | 2021-12-03 | 2021-12-03 | Guard bar assembly |
Country Status (1)
| Country | Link |
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| CN (1) | CN114228648A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115321444A (en) * | 2022-08-30 | 2022-11-11 | 江苏徐工国重实验室科技有限公司 | Work platform and aerial work vehicle |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110049915A1 (en) * | 2008-04-08 | 2011-03-03 | Showa Denko K.K. | Bumper reinforcement for vehicles |
| US20190030978A1 (en) * | 2017-07-27 | 2019-01-31 | Y-Tec Corporation | Vehicle torsion beam suspension and vehicle torsion beam |
-
2021
- 2021-12-03 CN CN202111469731.7A patent/CN114228648A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110049915A1 (en) * | 2008-04-08 | 2011-03-03 | Showa Denko K.K. | Bumper reinforcement for vehicles |
| US20190030978A1 (en) * | 2017-07-27 | 2019-01-31 | Y-Tec Corporation | Vehicle torsion beam suspension and vehicle torsion beam |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115321444A (en) * | 2022-08-30 | 2022-11-11 | 江苏徐工国重实验室科技有限公司 | Work platform and aerial work vehicle |
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| PB01 | Publication | ||
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20220325 |
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| RJ01 | Rejection of invention patent application after publication |