Design method of pipe harness fixing device, pipe harness fixing device and vehicle

Abstract

The present invention relates to a design method of a pipe and wire harness fixing device, a pipe and wire harness fixing device and a vehicle. The pipe and wire harness fixing device comprises a first bracket for fixing one end of a pipe and wire harness and a second bracket for fixing the other end of the pipe and wire harness, the second bracket comprises a fixed frame and a movable frame that can rotate relative to the fixed frame, so that part of the pipe and wire harness fixed at the chassis end can rotate relative to the fixed frame with the movable frame, and the first bracket and / or the second bracket are designed to be in a shape consistent with the pipe and wire harness in a natural bending state, so that when the vehicle is in a static state when stopped, the entire pipe and wire harness is in a natural bending state when fixed in the pipe and wire harness fixing device, and is not interfered by external forces; when the vehicle is in a dynamic state when driving, part of the pipe and wire harness fixed at the chassis end can rotate relative to the fixed frame with the movable frame, so that the pipe and wire harness at the chassis end and the pipe and wire harness at the cab end can move synchronously, and the wear of the pipe and wire harness is avoided at the root.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and in particular to a design method for a pipe harness fixing device, a pipe harness fixing device and a vehicle. Background Art

[0002] As vehicles become more electrified and intelligent, the types and quantities of electronic devices integrated in vehicles are increasing, which requires a larger pipe and wire harness system to deliver energy and signals to the electronic devices on the vehicle to enable them to function. Therefore, the reliability of the pipe and wire harness system is particularly important, making the fixing device of the pipe and wire harness extremely important.

[0003] Normally, one end of the tube and wire harness from the chassis to the cab section of the vehicle is fixed on the white body of the cab, and the other end is fixed on the chassis. However, due to the influence of factors such as the fixed structure on the vehicle, space problems and installation methods, and because the cab of the vehicle frequently jumps up and down and tilts left and right relative to the chassis during operation, the cab end will continue to move, resulting in the bending degree of the tube or wire harness becoming more and more serious, and frequent interference between the tube and wire harness, as well as between the tube or wire harness and the fixed structure on the vehicle, there is a risk of wear of the tube and wire harness, which reduces the safety of the vehicle. The existing layout schemes of tube and wire harness are all dedicated to fixing the tube and wire harness at the cab end of the vehicle and the tube and wire harness at the chassis end with metal clamps by interference fit. However, since the force of the cab movement is much greater than the force of the clamp fixation, the tube and wire harness are still worn, and the interference fit fixation method itself damages the tube and wire harness, and may also cause the risk of single wires in the tube and wire harness being crushed. Summary of the invention

[0004] Based on this, it is necessary to provide a design method for a pipe and wire harness fixing device, a pipe and wire harness fixing device and a vehicle to address the problem that the pipe and wire harness in existing vehicles are severely bent, which easily leads to the wires in the pipe and wire harness being broken. The pipe and wire harness fixing device designed by the design method for the pipe and wire harness fixing device can fix the pipe and wire harness on the pipe and wire harness fixing device in a naturally bent state, thereby effectively reducing the local deformation of the pipe and wire harness.

[0005] According to one aspect of the present application, a design method for a pipe harness fixing device is provided, comprising the following steps:

[0006] S1. Designing the first bracket and / or the second bracket of the pipe harness fixing device in accordance with the shape;

[0007] S2. Designing the swing angle of the movable frame for mounting the tube bundle and the wire harness in the second bracket relative to the fixed frame;

[0008] S3. Determine the installation position of the first bracket so that the tube bundle and the wire harness are in a naturally bent state when they are fixed as a whole to the tube and wire harness fixing device.

[0009] In one embodiment, step S1 comprises:

[0010] S11. Select tube bundles of different specifications for bending tests;

[0011] S12, obtaining the bending radius values ​​of the tube bundles of different specifications under the extreme natural bending state;

[0012] S13, selecting the maximum value among all the obtained bending radius values;

[0013] S14, determining a bending radius of the fixing frame according to the selected maximum value, and / or determining a bending radius of the first bracket;

[0014] S15. Determine the bending radius of the tube bundle and the wire harness when they are fixed to the first bracket and / or the second bracket according to the bending radius of the fixing frame and / or the bending radius of the first bracket, so that the parts of the tube bundle and the wire harness fixed to the first bracket and / or the second bracket are in a naturally bent state.

[0015] In one embodiment, step S2 comprises:

[0016] S21. Obtain a swing angle of the movable frame relative to the fixed frame according to a motion range of the first frame relative to the second frame.

[0017] In one embodiment, after step S2 and before step S3, the method further includes:

[0018] S20, adjusting the damping force of the movable frame relative to the fixed frame so that the damping force is smaller than the fixing force of the first bracket on the tube bundle and the wire harness and smaller than the fixing force of the fixed frame on the tube bundle and the wire harness.

[0019] In one embodiment, step S3 comprises:

[0020] S31, based on the angle at which the tube bundle and the wire harness extend from one end of the movable frame close to the first bracket, using three-dimensional simulation to check the movement state and peripheral clearance of the tube bundle and the wire harness when the first bracket moves relative to the second bracket;

[0021] S32. Obtaining an installation position of the first bracket according to a result of the three-dimensional simulation.

[0022] The design method of the above-mentioned pipe and wire harness fixing device is to perform conformal design on the first bracket and / or the second bracket so that in a static state, the parts of the pipe and wire harness fixed to the first bracket and the second bracket are in a naturally bent state; then, by designing the swing angle range of the movable bracket of the second bracket relative to the fixed bracket, when the cab end moves relative to the chassis end during the operation of the vehicle, the pipe and wire harness can also bend and move within their own deflection range; further, the installation position of the first bracket is determined according to the extension angle of the pipe and wire harness from the second bracket, so that the pipe and wire harness are in a naturally bent state when fixed as a whole on the pipe and wire harness fixing device, and no matter in a static state when the vehicle is stopped or in a dynamic state when the vehicle is running, the pipe and wire harness will not be subjected to a large bending force at any part, which effectively reduces the local deformation of the pipe and wire harness, avoids the occurrence of wires in the pipe and wire harness being crushed, and effectively improves the safety of the vehicle.

[0023] According to another aspect of the present application, a pipe harness fixing device is provided. The pipe harness fixing device is designed using the design method described above. The pipe harness fixing device includes:

[0024] A first bracket, used for fixing one end of the wire harness and one end of the tube bundle;

[0025] A second bracket is arranged in a spaced relationship with the first bracket along a routing direction, the first bracket can move relative to the second bracket, the second bracket is used to fix the other end of the wire harness away from the first bracket and fix the other end of the tube bundle away from the first bracket, the second bracket includes a fixed frame and a movable frame movably connected to the fixed frame;

[0026] The movable frame can rotate relative to the fixed frame with an axis perpendicular to the routing direction as a rotation axis, so that when the first bracket moves relative to the second bracket, parts of the tube bundle and the wire harness can follow the movable frame to rotate relative to the fixed frame.

[0027] In one embodiment, the fixed frame includes a first connecting portion, a first transition portion, a second connecting portion, a second transition portion and a third connecting portion which are connected in sequence along the routing direction, an end of the first connecting portion away from the first transition portion is connected to the movable frame, and the first transition portion and the second transition portion are arc-shaped structures.

[0028] In one embodiment, the first bracket includes a first fixing seat for fixing one end of the wire harness and a second fixing seat for fixing one end of the tube bundle, the first fixing seat and the second fixing seat are arranged at an interval, and the routing direction intersects with the line connecting the first fixing seat and the second fixing seat.

[0029] In one embodiment, the first fixing seat and / or the second fixing seat bends and extends along the routing direction.

[0030] According to another aspect of the present application, a vehicle is provided, comprising a cab end, a chassis end arranged relatively spaced apart from the cab end, and a pipe harness fixing device as described above, wherein the cab end is movable relative to the chassis end, a first bracket of the pipe harness fixing device is mounted on the cab end, and a second bracket of the pipe harness fixing device is mounted on the chassis end.

[0031] The above-mentioned pipe and wire harness fixing device and vehicle are configured with a first bracket for fixing one end of the pipe and wire harness and a second bracket for fixing the other end of the pipe and wire harness on the pipe and wire harness fixing device, the first bracket is installed on the cab end of the vehicle, and the second bracket is installed on the chassis end of the vehicle, and a fixing frame and a movable frame that can rotate relative to the fixing frame are provided on the second bracket, so that part of the pipe and wire harness fixed to the chassis end can rotate with the movable frame relative to the fixed frame, thereby achieving the effect that the pipe and wire harness at the chassis end and the pipe and wire harness at the cab end can move synchronously, so that when the cab end jumps up and down and tilts left and right relative to the chassis end during dynamic driving of the vehicle, the wear between the pipe and wire harness and the wear between the pipe and wire harness and the bracket are fundamentally avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only one embodiment of the present invention. For ordinary technicians in this field, drawings of other embodiments can be obtained based on these drawings without paying creative work.

[0033] Figure 1 A three-dimensional schematic diagram of a pipe harness fixing device provided by an embodiment of the present invention;

[0034] Figure 2 A schematic diagram of a first bracket provided in an embodiment of the present invention;

[0035] Figure 3 A schematic diagram of a second bracket provided in an embodiment of the present invention;

[0036] Figure 4 for Figure 3 A magnified image of area A;

[0037] Figure 5 A schematic diagram of design steps of a design method for a pipe harness fixing device provided by an embodiment of the present invention;

[0038] Figure 6A schematic diagram of the swing angle range of the movable frame relative to the fixed frame of the second bracket provided in an embodiment of the present invention.

[0039] Description of reference numerals:

[0040] 10. Pipe harness fixing device; 100. First bracket; 110. Bottom plate; 120. First fixing seat; 130. Second fixing seat; 131. Rubber pad; 200. Second bracket; 210. Base; 220. Fixing frame; 221. First wiring trough; 222. Threading hole; 223. First connecting part; 224. First transition part; 225. Second connecting part; 226. Second transition part; 227. Third connecting part; 230. Movable frame; 231. Second wiring trough; 30. Pipe harness; 40. Wiring harness; 50. Airbag. DETAILED DESCRIPTION

[0041] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0042] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “liquid level”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0043] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0044] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature has a higher liquid level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower liquid level than the second feature.

[0046] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "liquid horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0047] An embodiment of the present invention provides a pipe harness fixing device, a vehicle, and a design method for the pipe harness fixing device. The vehicle includes the pipe harness fixing device, which is used to fix pipe harnesses and wire harnesses used for electrical control in the vehicle to prevent a large number of pipe harnesses and wire harnesses from being entangled with each other, so that the pipe harnesses and wire harnesses can normally transmit energy and signals to various electronic devices to control the vehicle, thereby ensuring the normal operation of the vehicle.

[0048] The following uses the pipe harness fixing device on a vehicle as an example to illustrate the structure of the pipe harness fixing device and the design method of the pipe harness fixing device in the present application. This embodiment is only used as an example and does not limit the technical scope of the present application. It can be understood that in other embodiments, the pipe harness fixing device of the present application is not limited to being used in vehicles, but can also be used in any other type of mechanical equipment, which is not limited here.

[0049] The following combination Figures 1 to 6, introduces the preferred implementation methods of the pipe harness fixing device and the design method of the pipe harness fixing device provided in this application.

[0050] like Figure 1 As shown, a pipe harness fixing device 10 installed on a vehicle is used to fix the wire harness 40 for electrical control and the pipe harness 30 for brake control on the vehicle. The pipe harness fixing device 10 includes a first bracket 100 and a second bracket 200, wherein the first bracket 100 is used to fix one end of the pipe harness 30 and one end of the wire harness 40, and the second bracket 200 is used to fix the other end of the pipe harness 30 and the other end of the wire harness 40. The vehicle (not shown) includes a cab end and a chassis end spaced apart from the cab end, and the cab end and the chassis end are suspended and connected, and there is relative movement between the cab end and the chassis end. The first bracket 100 is fixed to the cab end of the vehicle, and the second bracket 200 is fixed to the chassis end of the vehicle, so that the first bracket 100 and the second bracket 200 are spaced apart in the routing direction of the pipe harness 30 and the wire harness 40, and the first bracket 100 can also move relative to the second bracket 200. Since the internal structure of the vehicle is complex and has many parts, the tube bundle 30 and the wire harness 40 need to avoid the fixed structure inside the vehicle. Therefore, the tube bundle 30 and the wire harness 40 need to be arranged in a curved manner, and their routing direction is the curved direction shown by the arrow in the figure.

[0051] In some embodiments, Figure 2 As shown, the first bracket 100 includes a bottom plate 110, a first fixing seat 120 and a second fixing seat 130. The bottom plate 110 is mounted on the cab end of the vehicle, and the first fixing seat 120 and the second fixing seat 130 are mounted on the bottom plate 110. The first fixing seat 120 and the second fixing seat 130 are arranged at intervals, and the connecting line of the first fixing seat 120 and the second fixing seat 130 intersects with the direction of the tube bundle 30 and the wire harness 40. The first fixing seat 120 is used to fix one end of the wire harness 40, and the second fixing seat 130 is used to fix one end of the tube bundle 30.

[0052] Preferably, the first fixing seat 120 is a hollow tubular structure, and one end of the wiring harness 40 is passed through the first fixing seat 120 and fixed in the first fixing seat 120. In order to enable the end of the wiring harness 40 fixed on the first bracket 100 to avoid surrounding components and be fixed in a naturally bent state, the first fixing seat 120 is bent and extended along the routing direction. The bending radius of the first fixing seat 120 can be designed according to the surrounding environment and ensure that the force applied to the wiring harness 40 in the bent state does not exceed its own limit stress.

[0053] In one embodiment, the second fixing seat 130 includes a clamp 131, which is fixed to the bottom plate 110 by screws, and the tube bundle 30 is inserted into the clamp 131. The clamp 131 is sleeved on the tube bundle 30 and is tightly attached to the outer peripheral surface of the tube bundle 30 to fix one end of the tube bundle 30. Preferably, the second fixing seat 130 also includes a rubber gasket 132, which is located between the tube bundle 30 and the inner wall of the clamp 131. When the tube bundle 30 is fixed to the second fixing seat 130, it is in contact with the rubber gasket 132. Since the rubber gasket 132 can be deformed restorably when subjected to external force, the edges of the two opposite ends of the tube bundle 30 and the clamp 131 along the routing direction will not be locally subjected to large stress.

[0054] By designing the first fixing seat 120 and the second fixing seat 130 to be the above-mentioned shapes, when the vehicle is static, the fixing of the wire harness 40 in the first fixing seat 120 and the fixing of the tube bundle 30 in the second fixing seat 130 are both in accordance with their own stiffness characteristics, and there will be no stress concentration points, thereby avoiding abnormal stress on the tube bundle 30 and the wire harness 40.

[0055] It should be noted that the number of the second fixing seat 130 is not limited, and the second fixing seat 130 may also be composed of multiple clamps arranged in sequence along the routing direction, and the second fixing seat 130 may also be consistent with the shape of the first fixing seat 120, and the first fixing seat 120 may also be a clamp, which is not limited here.

[0056] See also Figure 3 and Figure 4 In some embodiments, the second bracket 200 includes a base 210, a fixed frame 220 and a movable frame 230. The base 210 is fixedly mounted on the chassis end of the vehicle, the fixed frame 220 is fixedly mounted on the base 210 by welding or screw connection, and the movable frame 230 is movably connected to one end of the fixed frame 220 close to the first bracket 100. Preferably, as Figure 4 As shown, the movable frame 230 is hingedly connected to the fixed frame 220. The movable frame 230 can rotate relative to the fixed frame 220 with an axis perpendicular to the routing direction as the rotation axis. The tube bundle 30 and the wire harness 40 pass through the movable frame 230 and the fixed frame 220 in turn, and are fixed on the movable frame 230 and the fixed frame 220 at the same time.

[0057] Thus, during the driving of the vehicle, the cab end will move up and down and roll left and right relative to the chassis end. The movable frame 230 will also rotate along with the fixed frame 220, enabling the parts of the pipe bundle 30 and the wire harness 40 fixed on the second bracket 200 to rotate relative to the fixed frame 220 along with the movable frame 230. This avoids the situation where when the pipe bundle 30 and the wire harness 40 are fixed on the second bracket 200, the pipe bundle 30 and the wire harness 40 continuously rub against the edge of the second bracket 200, resulting in relatively large local stress on the outer peripheral surfaces of the pipe bundle 30 and the wire harness 40, and further causing damage to the pipe bundle 30 and the wire harness 40. From the root cause, it avoids the wear between the pipe bundle 30 and the wire harness 40 and the first bracket 100 and the wear between the pipe bundle 30 and the wire harness 40 and the second bracket 200.

[0058] Specifically, since both the pipe bundle 30 and the wire harness 40 have relatively long lengths, in order to avoid interference between the pipe bundle 30 and the wire harness 40 and other components on the vehicle due to their long lengths, the fixed frame 220 is designed as a long strip-shaped trough structure. The cross-section of the fixed frame 220 is in the shape of a "凵", forming a first wire routing groove 221 extending along the wire routing direction on the fixed frame 220, and a plurality of spaced-apart wire passing holes 222 are provided on the side wall and the bottom wall of the fixed frame 220. Considering that the flexibilities of the pipe bundle 30 and the wire harness 40 are different and the displacement degrees along with the movement of the cab are also different, in order to avoid relative friction between the pipe bundle 30 and the wire harness 40 due to different flexibilities and movement amounts, the pipe bundle 30 and the wire harness 40 are respectively fixed in the first wire routing groove 221 of the fixed frame 220 by cable ties. Each cable tie sequentially passes through a wire passing hole 222 provided on the bottom wall and a wire passing hole 222 provided on the side wall, thereby bundling and fixing the pipe bundle 30 or the wire harness 40 in the first wire routing groove 221.

[0059] Preferably, since there are many parts on the vehicle chassis, in order to avoid these parts, the tube bundle 30 and the wire harness 40 must not be fixed in the vehicle in a straight direction, but in a curved direction. In order to install the tube bundle 30 and the wire harness 40 in the vehicle in a natural bending state (i.e., the tube bundle 30 and the wire harness 40 are less than the ultimate stress when bent), the fixing frame 220 is designed as a curved shape consistent with the natural bending state of the tube bundle 30 and the wire harness 40. The fixing frame 220 includes a first connecting portion 223, a first transition portion 224, a second connecting portion 225, a second transition portion 226 and a third connecting portion 227 connected in sequence along the routing direction. Among them, one end of the first connection part 223 away from the first transition part 224 is connected to the movable frame 230, the first transition part 224 and the second transition part 226 are both arc-shaped structures, the first connection part 223, the second connection part 225 and the third connection part 227 can be a straight structure or an arc structure, which can be designed according to specific circumstances, and it is only necessary to ensure that the tube bundle 30 and the wire harness 40 are in a natural bending state when installed in the fixed frame 220. More preferably, the arc radius of the first transition part 224 and the second transition part 226 is greater than 100 mm, so that the tube bundle 30 and the wire harness 40 can be in a natural bending state under different size specifications without the local force exceeding their own limit stress.

[0060] The cross section of the movable frame 230 is the same as that of the fixed frame 220, so that the movable frame 230 forms a second wiring groove 231 extending along the wiring direction, and the second wiring groove 231 is interconnected with the first wiring groove 221. Different from the fixed frame 220, in this embodiment, the length of the movable frame 230 along the wiring direction is shorter than that of the fixed frame 220, and the movable frame 230 is designed to be straight.

[0061] So, like Figure 1 As shown, when the tube bundle 30 and the wire harness 40 are integrally installed on the tube and wire harness fixing device 10, the opposite ends of the tube bundle 30 and the wire harness 40 are respectively fixed on the first bracket 100 and the second bracket 200, and the middle part of the tube bundle 30 is suspended between the first bracket 100 and the second bracket 200. In this way, the tube bundle 30 and the wire harness 40 can be installed on the vehicle in a naturally bent state, and the production cost of the tube bundle 30 and the wire harness 40 can be saved.

[0062] It is worth noting that the fixed frame 220 and the movable frame 230 are not limited to the groove-type structure as described above, that is, the cross-sectional shapes of the fixed frame 220 and the movable frame 230 are not limited, as long as the tube bundle 30 and the wire harness 40 can pass through the movable frame 230 and the fixed frame 220 in sequence and can be fixed on the movable frame 230 and the fixed frame 220 at the same time. In addition, the structure of the first bracket 100 is not limited to the above structure, and can also be designed to be the same shape as the second bracket 200 according to actual conditions, which is not limited here.

[0063] Furthermore, the following is combined with Figures 1 to 6 The design method of the above-mentioned pipe harness fixing device 10 is introduced.

[0064] The first step S1 is to perform a conformal design on the first bracket 100 and / or the second bracket 200 so that the parts of the tube bundle 30 and the wire harness 40 fixed to the first bracket 100 and / or the second bracket 200 are in a naturally bent state. This step is to perform a conformal design on the first bracket 100 and / or the second bracket 200 according to the naturally formed angles of the tube bundle 30 and the wire harness 40 to ensure that the parts of the tube bundle 30 and the wire harness 40 fixed in the bracket are in a naturally bent state without being interfered by external forces. Since the tube bundle 30 is more flexible than the wire harness 40, a bending test is performed on the tube bundle 30, and the structure of the bracket is designed according to the results of the bending test. Specifically, the bending test includes the following steps:

[0065] S11, select tube bundles 30 of different specifications for bending test. The tube bundles 30 have different specifications, each tube bundle 30 may have different numbers of tube bundles 30, each tube bundle 30 may have different diameters, and the diameter of each tube bundle 30 varies from 6 mm to 28 mm. For example, in a tube bundle 30 composed of 6 mm tube bundles 30, there are six tube bundles 30, and in another example, in a tube bundle 30 composed of 20 mm tube bundles 30, there are 20 tube bundles 30. In this way, the tube bundles 30 of different specifications are subjected to natural bending tests, and each tube bundle 30 of each specification is subjected to multiple bending tests, and the bending angle of each bending is taken at a substantially same angle between 90° and 180°.

[0066] S12, obtaining the bending radius values ​​of the tube bundles 30 of different specifications in the ultimate natural bending state. The bending radius value is the bending radius value of the tube bundles 30 of different specifications when the ultimate stress is the maximum. If the bending radius value is exceeded, the tube bundle 30 will fail. Therefore, when the tube bundle 30 is in the natural bending state, the bending radius of the tube bundle 30 will not exceed the bending radius value.

[0067] S13, select the maximum value from all the obtained bending radius values. Since the diameters of the tube bundles 30 of different specifications are different, the bending radius values ​​of the tube bundles 30 of different specifications in the extreme natural bending state are also different. The thicker tube bundle 30 has a larger natural forming bending radius value due to its smaller flexibility; the thinner tube bundle 30 has a smaller natural forming bending radius value due to its greater flexibility. As long as the maximum value is selected from all the obtained bending radius values ​​as the bending radius value of the tube bundle 30 in the extreme natural bending state, it can be ensured that the force of the tube bundles 30 of all specifications will not exceed its ultimate stress when the bending radius is less than this bending radius value. Since the flexibility of the wire harness 40 is less than that of the tube bundle 30, as long as the bending radius value does not exceed the selected maximum bending radius value, the wire harness 40 will not exceed its ultimate stress when bent at the maximum bending radius value.

[0068] S14, determining the bending radius of the fixing frame 220 and / or determining the bending radius of the first bracket 100 according to the selected maximum value.

[0069] S15, determining the bending radius of the tube bundle 30 and the wire harness 40 when they are fixed to the first bracket 100 and / or the second bracket 200 according to the bending radius of the fixing frame 220 and / or the bending radius of the first bracket 100, so that the parts of the tube bundle 30 and the wire harness 40 fixed to the first bracket 100 and / or the second bracket 200 are in a naturally bent state.

[0070] In step S14, the fillet radius of the first transition portion 224 and the second transition portion 226 in the fixing frame 220 is determined, and / or the bending radius of the first fixing seat 120 and / or the second fixing seat 130 in the first bracket 100 is determined. It is known that the maximum bending radius value selected above for the tube bundle 30 and the wire harness 40 will not exceed their limit stress, so the shape of the fixing frame 220 or the shape of the first fixing seat 120 or the second fixing seat 130 in the first bracket 100 can be designed according to the maximum bending radius value, that is, in step S15, according to the shape of the fixing frame 220 or the shape of the first fixing seat 120 or the second fixing seat 130 in the first bracket 100, the opposite ends of the tube bundle 30 and the wire harness 40 can be in a natural bending state when fixed on the first bracket 100 and the second bracket 200 without failure.

[0071] The specific test results are shown in Table 1 below. It can be seen from the test results that when the maximum tube bundle specification is 36 mm in diameter and each tube bundle 30 has 36 tube bundles 30, the natural forming bending radius of the tube bundle 30 is 80 mm to 100 mm, while the natural forming bending radius of the tube bundle 30 of other specifications does not exceed 100 mm. Therefore, 100 mm is the maximum natural forming bending radius of the tube bundle 30. This means that as long as the fillet radius of the first transition portion 224 and the second transition portion 226 in the fixing frame 220, or the bending radius of the first fixing seat 120 or the second fixing seat 130 in the first bracket 100 is designed to be no more than 100 mm, the opposite ends of the tube bundle 30 and the wire harness 40 can be in a natural bending state when fixed on the first bracket 100 and the second bracket 200 without failure.

[0072] Table 1

[0073]

[0074] The second step S2 is to design the swing angle of the movable frame 230 of the second bracket 200 relative to the fixed frame 220. In this step, it is necessary to analyze the limit value and direction of the cab displacement when the cab bounces up and down, tilts left and right, etc. during the driving process of the vehicle, so as to determine the direction of the pipeline harness 40 and the range of motion of the slot-shaped articulated bracket. Specifically, it includes:

[0075] S21, obtaining the swing angle of the movable frame 230 relative to the fixed frame 220 according to the motion range of the first frame 100 relative to the second frame 200. Figure 1 , Figure 2 and Figure 6 As shown, Figure 6 The dotted line on the far left is the center line of the vehicle. The left and right ends of the vehicle are symmetrical with respect to the center line. The cab has an airbag 50. The distance D1 from the center line to the airbag 50 is 734 mm, and the distance D2 from the center line to the end of the second bracket 200 close to the first bracket 100 is 920 mm. The movement of the cab is limited by the suspension of the cab airbag 50. According to the principle of similar triangles, the ratio D1 / D2 of the distance D1 from the airbag 50 to the center line of the vehicle and the distance D2 from the end of the second bracket 200 close to the first bracket 100 to the center line of the vehicle is equal to the ratio E1 / E2 of the movement limit E1 of the airbag 50 and the movement range E2 of the end of the second bracket 200 close to the first bracket 100. Taking the vehicle model in this embodiment as an example, the upper and lower movement limit E1 of the airbag 50 suspension is ±50mm. According to the principle of similar triangles, the movement range E2 of the second bracket 200 close to one end of the first bracket 100 is ±62mm. Therefore, the swing range of the movable frame 230 relative to the fixed frame 220 can be designed to be ±62mm.

[0076] Preferably, a step S20 may be added after step S2 , adjusting the damping force of the movable frame 230 relative to the fixed frame 220 so that the damping force is smaller than the fixing force of the first bracket 100 on the tube bundle 30 and the wire harness 40 and smaller than the fixing force of the fixed frame 220 on the tube bundle 30 and the wire harness 40 .

[0077] In this way, by adjusting the damping force of the movable frame 230 relative to the fixed seat, when the cab end moves relative to the chassis end, the movable frame 230 of the second bracket 200 can flexibly move relative to the fixed frame 220, so that the ends of the tube bundle 30 and the wire harness 40 fixed at the chassis end and the cab end can be kept stationary during the vehicle driving process, and only the middle part of the tube bundle 30 and the wire harness 40 moves synchronously with the cab with the movable frame 230. This further avoids the phenomenon that the tube bundle 30 and the wire harness 40 are subjected to large friction and are worn during the vehicle driving process.

[0078] The third step S3 is to determine the installation position of the first bracket 100 so that the tube bundle 30 and the wire harness 40 are naturally bent when they are fixed to the tube and wire harness fixing device 10 as a whole. Specifically, in this step:

[0079] First, S31, according to the angle at which the tube bundle 30 and the wire harness 40 extend from the end of the movable frame 230 close to the first bracket 100, the movement state and the surrounding clearance of the tube bundle 30 and the wire harness 40 when the first bracket 100 moves relative to the second bracket 200 are checked by three-dimensional simulation. Since the fixed frame 220 in the second bracket 200 is designed to be in the same curved shape as the tube bundle 30 and the wire harness 40 in the natural curved state, the tube bundle 30 and the wire harness 40 extending from the end of the second bracket 200 close to the first bracket 100 must also have a certain angle. In order to avoid the suspension part of the tube bundle 30 and the wire harness 40 located between the first bracket 100 and the second bracket 200 being in a natural curved state and avoiding the surrounding fixed parts, the movement state of the tube bundle 30 and the wire harness 40 when the first bracket 100 moves relative to the second bracket 200 and the clearance with the surrounding fixed parts need to be checked by three-dimensional simulation method to check whether there is interference.

[0080] Then, in S32, the installation position of the first bracket 100 is obtained according to the result of the three-dimensional simulation. The first bracket 100 is installed at the installation position obtained according to the result of the three-dimensional simulation, so that the tube bundle 30 and the wire harness 40 can be in a natural bending state when they are fixed to the tube and wire harness fixing device 10 as a whole, and will not be locally subjected to a large bending force, causing the tube bundle 30 or the wire harness 40 to be worn or fail.

[0081] Furthermore, after the tube bundle 30 and the wire harness 40 are fixed on the tube bundle fixing device 10 designed by the above-mentioned design method, and the tube bundle fixing device 10 is installed on the vehicle for road testing, the surfaces of the tube bundle 30 and the wire harness 40 are not worn. It is proved that the tube bundle fixing device 10 designed by the design method provided in this application is reasonable, and can ensure that when the vehicle is stopped, the entire tube bundle 40 is in a natural bending state when it is fixed in the tube bundle fixing device 10, and is not interfered by external forces; when the vehicle is running, the part of the tube bundle 30 and the wire harness 40 fixed at the chassis end can move with the moving movable frame 230. When the part of the tube bundle 30 and the wire harness 40 moves synchronously with the movable frame 230, it can be ensured to the maximum extent that there is no relative movement between the tube bundle 30 and the first bracket 100, the wire harness 40 and the first bracket 100, the tube bundle 30 and the second bracket 200, the wire harness 40 and the second bracket 200, and the tube bundle 30 and the wire harness 40.

[0082] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0083] The above-mentioned embodiment only expresses one implementation mode of the present invention, and its description is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the attached claims.

Claims

1. A design method for a pipe harness fixing device, characterized in that: The steps include: S1. Designing the first bracket and the second bracket of the pipe harness fixing device in accordance with the shape; S2. Designing the swing angle of the movable frame for mounting the tube bundle and the wire harness in the second bracket relative to the fixed frame; S3, determining the installation position of the first bracket so that the tube bundle and the wire harness are in a naturally bent state when they are fixed as a whole to the tube bundle fixing device; Wherein step S1 comprises: S11. Select tube bundles of different specifications for bending tests; S12, obtaining the bending radius values ​​of the tube bundles of different specifications under the extreme natural bending state; S13, selecting the maximum value among all the obtained bending radius values; S14, determining a bending radius of the fixing frame and a bending radius of the first bracket according to the selected maximum value; S15, determining the bending radius of the tube bundle and the wire harness when they are fixed to the first bracket and the second bracket according to the bending radius of the fixing frame and the bending radius of the first bracket, so that the parts of the tube bundle and the wire harness fixed to the first bracket and the second bracket are in a naturally bent state; Step S2 includes: S21. Obtain a swing angle of the movable frame relative to the fixed frame according to a motion range of the first frame relative to the second frame.

2. The design method according to claim 1, characterized in that: After step S2 and before step S3, the method further includes: S20, adjusting the damping force of the movable frame relative to the fixed frame so that the damping force is smaller than the fixing force of the first bracket on the tube bundle and the wire harness and smaller than the fixing force of the fixed frame on the tube bundle and the wire harness.

3. The design method according to claim 1, characterized in that: Step S3 includes: S31, based on the angle at which the tube bundle and the wire harness extend from one end of the movable frame close to the first bracket, using three-dimensional simulation to check the movement state and peripheral clearance of the tube bundle and the wire harness when the first bracket moves relative to the second bracket; S32. Obtaining an installation position of the first bracket according to a result of the three-dimensional simulation.

4. A pipe harness fixing device, characterized in that: The pipe harness fixing device is designed by the design method described in any one of claims 1 to 3, and the pipe harness fixing device comprises: A first bracket, used for fixing one end of the wire harness and one end of the tube bundle; A second bracket is arranged with a spacing from the first bracket along a routing direction, the first bracket can move relative to the second bracket, the second bracket is used to fix the other end of the wire harness away from the first bracket and fix the other end of the tube bundle away from the first bracket, the second bracket includes a fixed frame and a movable frame movably connected to the fixed frame; The movable frame can rotate relative to the fixed frame with an axis perpendicular to the routing direction as a rotation axis, so that when the first bracket moves relative to the second bracket, parts of the tube bundle and the wire harness can follow the movable frame to rotate relative to the fixed frame.

5. The pipe harness fixing device according to claim 4, characterized in that: The fixed frame includes a first connecting portion, a first transition portion, a second connecting portion, a second transition portion and a third connecting portion which are sequentially connected along the routing direction; an end of the first connecting portion away from the first transition portion is connected to the movable frame; and the first transition portion and the second transition portion are arc-shaped structures.

6. The pipe harness fixing device according to claim 4, characterized in that: The first bracket includes a first fixing seat for fixing one end of the wire harness and a second fixing seat for fixing one end of the tube bundle. The first fixing seat and the second fixing seat are arranged at an interval, and the routing direction intersects with the line connecting the first fixing seat and the second fixing seat.

7. The pipe harness fixing device according to claim 6, characterized in that: The first fixing seat and the second fixing seat are bent and extended along the routing direction.

8. The pipe harness fixing device according to claim 6, characterized in that: The second fixing seat includes a clamp, which is sleeved on the tube bundle and closely attached to the outer peripheral surface of the tube bundle.

9. The pipe harness fixing device according to claim 8, characterized in that: The second fixing seat further includes a rubber gasket, which is located between the tube bundle and the inner wall of the clamp. The tube bundle is in contact with the rubber gasket when being fixed to the second fixing seat.

10. A vehicle, characterized in that: It comprises a cab end, a chassis end spaced relative to the cab end, and a pipe harness fixing device as claimed in any one of claims 4 to 9, wherein the cab end is movable relative to the chassis end, a first bracket of the pipe harness fixing device is mounted on the cab end, and a second bracket of the pipe harness fixing device is mounted on the chassis end.

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