Wire harness and wire harness protection structure

Abstract

The invention discloses a wire harness and a wire harness protection structure, and the wire harness comprises a main wire harness, a branch wire harness which is branched and extends from the main wire harness, and a protection structure which is installed on the branch wire harness, a branched fixing structure is installed between the main wire harness and the branch wire harness, and the branched fixing structure is provided with a first supporting part and a second supporting part. The first supporting part and the second supporting part are arranged at the branch position of the main wire harness and located on the two sides of the branch wire harness respectively, certain supporting and buffering can be formed on the two sides of the branch wire harness, on one hand, the branch wire harness is supported, and on the other hand, dragging acting force generated when the branch wire harness is pulled and swings is reduced. The protection structure can automatically and slowly store redundant branch wire harnesses into the protection shell for protection after the branch wire harnesses are arranged and connected, and the protection structure can guide the branch wire harnesses to carry out circuit arrangement according to different conditions, so that the use is more flexible and convenient.

Description

Technical Field

[0001] The invention relates to the technical field of automobile wiring harnesses, in particular to a wiring harness and a wiring harness protection structure. Background Art

[0002] Automotive wiring harnesses are important components that connect automotive power supplies, actuators, sensors and other electronic and electrical equipment. The current trend of electrification, intelligence and networking in automobiles has greatly promoted the development of automotive wiring harnesses, and at the same time, the requirements for automotive wiring harnesses are getting higher and higher. In recent years, new energy vehicles have developed vigorously, and their dependence on automotive wiring harnesses has become higher, which has also put forward more stringent requirements on the layout of automotive wiring harnesses.

[0003] The automotive wiring harness is an important component of the electrical components of new energy vehicles. The quality of its performance has a crucial impact on the reliability and stability of new energy vehicles. Therefore, it is necessary to scientifically design the layout of the automotive wiring harness to further improve the reliability of the automotive wiring harness. During the laying process of the existing automotive wiring harness, the branch harness needs to be bent and pulled, which is easy to be damaged. When laying the end of the branch harness, a certain length needs to be reserved to facilitate the connection of electrical equipment. After the electrical equipment is connected, the excess branch harness is easy to accumulate inside, which is easy to get entangled and easily damaged by mutual friction. Therefore, a wiring harness and a wiring harness protection structure are urgently needed to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to provide a wire harness and a wire harness protection structure, which can effectively solve the problems existing in the above-mentioned prior art.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions: a wiring harness, comprising a main wiring harness and a branch wiring harness branched from the main wiring harness, a branch fixing structure is installed between the main wiring harness and the branch wiring harness, the branch fixing structure has a first supporting part and a second supporting part, the first supporting part and the second supporting part are respectively arranged at the branch of the main wiring harness and located on both sides of the branch wiring harness; and The first support part and the second support part are both airbag structures, and the first support part and the second support part are connected by an intermediate sleeve, and the intermediate sleeve is configured to guide the internal airflow of the first support part or the second support part toward the corresponding second support part or the first support part when the first support part or the second support part is under pressure; The first supporting portion and / or the second supporting portion is in a non-filled state, and the total amount of gas in the first supporting portion and the second supporting portion at least satisfies that the first supporting portion or the second supporting portion is in a filled state.

[0006] Preferably, the first supporting portion and the second supporting portion are both provided with through holes, and the through holes are configured to adjust the shape of the corresponding first supporting portion or second supporting portion through deformation.

[0007] Preferably, the bifurcated fixing structure further comprises a restraining belt, which is configured to pass through the through hole in an open state and be wound around the intermediate sleeve to interrupt the conduction between the first supporting portion and the second supporting portion of the intermediate sleeve.

[0008] Preferably, a plurality of sleeves are installed at intervals on the main line harness and / or the branch line harness, and clips are spliced ​​on the sleeves, and the clips are used to be inserted into reserved holes of the automobile body.

[0009] The present invention also discloses a wiring harness protection structure for being assembled on a branch wiring harness, comprising a protective shell, wherein at least one section of a serpentine groove is arranged in the protective shell; a guide plate is installed at the bending part of the serpentine groove, one end of the guide plate is inserted into the protective shell, and the other end is installed with a roller and is used to guide the branch wiring harness to bend and change direction; the guide plate is configured to retract into the protective shell when under pressure, thereby increasing the space at the bending part and increasing the angle at the bending part of the branch wiring harness.

[0010] Preferably, a receiving groove is provided in the protective shell, one end of the guide plate is inserted into and slidably installed in the receiving groove, and a spring is installed between the guide plate and the inner wall of the receiving groove, and the spring tends to drive the guide plate to move along the receiving groove and extend out of the guide plate; and The initial state of the guide plate is that the guide plate is at least partially retracted into the receiving groove, and a limiting member is installed in the receiving groove, and the limiting member is used to lock or unlock the state of the guide plate.

[0011] Preferably, a cavity is provided in the guide plate, a piston rod structure is installed in the cavity, and one end of the piston rod structure is connected to the inner wall of the receiving groove; and The guide plate is provided with an air hole connected to the cavity, and the piston rod structure is configured to extend into the cavity when the spring is compressed and discharge the gas in the cavity through the air hole, and extend out of the cavity when the spring is reset and introduce gas into the cavity through the air hole.

[0012] Preferably, the limiting member comprises: A first protrusion, wherein a groove is provided in the receiving slot, the first protrusion is slidably mounted in the groove, and an elastic member is mounted on the first protrusion, the elastic member tends to drive the first protrusion to extend out of the groove toward the guide plate; A second protrusion is installed on a side of the guide plate facing the first protrusion, and the second protrusion is installed close to the roller shaft; and The first bump is configured as: When retracted into the groove, the restriction on the second protrusion is released, and the elastic member moves along the receiving groove under the action of the spring force and extends out of the guide plate; When extending out of the groove, the second protrusion is blocked and the guide plate is restricted from moving out of the receiving groove.

[0013] Preferably, two opposite surfaces of the serpentine groove are provided with slide grooves, and sliders are installed in the slide grooves. Slots are provided on the two sliders, and the branch harness is inserted into the slots through the sleeve plate, so that when the branch harness is displaced by force, the sliders are displaced synchronously; an inclined support plate is installed at one end of the slider facing the branch harness terminal, and the inclined support plate is used to support the branch harness and to separate at least part of the branch harness from contacting the inner wall of the serpentine groove; A rope is installed at one end of the slide groove facing the branch wiring harness terminal, one end of the rope is fixed in the protective shell, and the other end is connected to the first protrusion. A top block is installed at one end of the slider facing the branch wiring harness terminal, and the top block is used to move with the slider, contact and squeeze the rope, so that the first protrusion compresses the elastic member to move.

[0014] Preferably, a plurality of sections of serpentine grooves connected in series are arranged in the protective shell, and a plurality of branch grooves are opened in the protective shell between two adjacent serpentine grooves, and one end of each branch groove extends out of the protective shell, and the branch line beam enters the protective shell from any serpentine groove extension end or any branch groove extension end, and extends out of the protective shell from any serpentine groove extension end or any branch groove extension end.

[0015] Beneficial effect: In the present invention, a bifurcated fixing structure is installed between the main line harness and the branch line harness. The setting of the bifurcated fixing structure can stabilize the angle between the branch line harness and the main line harness, which is beneficial to the layout of the line. Among them, the first support part and the second support part of the airbag structure can form a certain support and buffer on both sides of the branch line harness, on the one hand, it supports the state of the branch line harness, and on the other hand, it reduces the pulling force generated when the branch line harness is pulled and swung; the first support part and the second support part can be connected through the action of the intermediate sleeve, and the corresponding supporting force of the two can be adjusted through the airflow between the two. Through the setting of the through hole and the restraining belt, the deformation of the through hole is used to provide space for the deformation of the first support part and the second support part, and the airflow between the two can be cut off by the restraining belt, so as to ensure that the two are in a stable state.

[0016] The present invention also includes a wiring harness protection structure, which can automatically and slowly store excess branch wiring harnesses into a protective shell for protection after the branch wiring harnesses are laid out and connected, thereby realizing the protection and automatic storage functions of the branch wiring harnesses. In addition, the protection structure can guide the branch wiring harnesses to lay out the lines according to different situations, making it more flexible and convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0018] In the attached picture: Figure 1 It is a structural schematic diagram of a wiring harness and a wiring harness protection structure of the present invention; Figure 2 It is a schematic diagram of the structure of the wiring harness of the present invention; Figure 3 It is a structural schematic diagram of the wiring harness protection structure of the present invention; Figure 4 It is a schematic diagram of the structure inside the wire harness protection structure of the present invention; Figure 5 It is a structural schematic diagram of the wiring harness protection structure and the branch wiring harness of the present invention; Figure 6 It is a structural schematic diagram of the guide plate and piston rod structure of the present invention; Figure 7 It is a structural schematic diagram of the slideway and the slider of the present invention; Numbers in the figure: 1. main line harness; 2. branch line harness; 31. first support part; 32. second support part; 33. middle sleeve; 34. through hole; 35. restraining belt; 41. sleeve plate; 42. clip; 51. protective shell; 52. serpentine groove; 53. cover plate; 54. convex strip; 55. storage groove; 56. branch groove; 57. groove; 6. guide plate; 61. roller; 62. cavity; 63. piston rod structure; 64. air hole; 7. spring; 81. inner tube; 82. outer tube; 83. elastic strip; 84. ball; 91. first protrusion; 92. second protrusion; 93. elastic member; 10. slide groove; 11. slider; 12. diagonal support plate; 13. rope; 14. top block; 15. slot. DETAILED DESCRIPTION

[0019] The embodiments of the present invention are described below in conjunction with the drawings in the embodiments of the present invention. The terms used in the implementation mode of the present invention are only used to explain the specific embodiments of the present invention, and are not intended to limit the present invention. The embodiments of the present application are described below in conjunction with the drawings.

[0020] Embodiment: A wiring harness is used to transmit and exchange input and output signals of automobile electrical functions, transfer currents generated by various power generation components such as batteries and motors to various actuators, and realize coordinated control and management of various electrical components of the automobile; the wiring harness includes a main wiring harness 1 and a branch wiring harness 2 branched and extended from the main wiring harness 1; refer to Figure 2As shown, a bifurcated fixed structure is installed between the main line harness 1 and the branch line harness 2, and the bifurcated fixed structure has a first support portion 31 and a second support portion 32, which are respectively arranged at the bifurcation of the main line harness 1 and located on both sides of the branch line harness 2; and the first support portion 31 and the second support portion 32 are both airbag structures, that is, they have certain extension and retraction properties, and are provided with a cavity to fill gas, and the first support portion 31 and the second support portion 32 are connected by an intermediate sleeve 33, and the intermediate sleeve 33 is configured to guide the internal airflow of the first support portion 31 or the second support portion 32 toward the corresponding second support portion 32 or the first support portion 31 when the first support portion 31 or the second support portion 32 is under pressure; During the wiring harness installation process, the branch harness 2 needs to be swung to adjust the direction of the branch harness 2. Based on the above, for example, during the swinging of the branch harness 2, the first support portion 31 contracts, the gas enters the second support portion 32 through the intermediate sleeve 33, and the second support portion 32 extends and expands. This process can buffer the pulling force generated when the branch harness 2 swings, and protect the branch connection between the branch harness 2 and the main harness 1. At the same time, through the action of the first support portion 31 and the second support portion 32, a certain support can be formed on both sides of the branch harness 2, thereby stabilizing the state of the branch harness 2, so as to facilitate better wiring of the branch harness 2, and after the wiring is completed, a certain partition is formed between the branch harness 2 and the main harness 1 to avoid friction between the supports of the two. The gas in the first support part 31 and the second support part 32 is set as follows: the first support part 31 and / or the second support part 32 is in a non-filled state, and the total amount of gas in the first support part 31 and the second support part 32 at least satisfies that the first support part 31 or the second support part 32 is in a filled state.

[0021] Among them, on the basis of the above, reference Figure 2 As shown, a through hole 34 is provided on both the first support portion 31 and the second support portion 32, and the through hole 34 is configured to adjust the shape of the corresponding first support portion 31 or the second support portion 32 through deformation, so that the first support portion 31 and the second support portion 32 can be deformed better, which is beneficial to the swing of the branch harness 2.

[0022] On the basis of the above, the bifurcated fixing structure further includes a tie belt 35, which is configured to pass through the through hole 34 in the open state and be wound around the intermediate sleeve 33, interrupting the conduction between the intermediate sleeve 33 and the first support portion 31 and the second support portion 32, referring to Figure 1As shown, at this time, the swinging state of the branch harness 2 will make the through hole 34 on the right side in an open state, and the left side in a deformed closed state. By passing the restraining belt 35 through the through hole 34 in the open state, the center sleeve is wrapped around and a certain winding force is formed to block the conduction between the first support part 31 and the second support part 32. At this time, the gas in the first support part 31 and the second support part 32 no longer circulates, so that the states of the first support part 31 and the second support part 32 are locked, and then the state of the branch harness 2 at this time is locked. In this state, the elasticity of the first support part 31 and the second support part 32 themselves and the space for deformation of the through hole 34 are used to provide the branch harness 2 with a swinging space within a certain area.

[0023] In a specific embodiment, reference Figure 2 As shown, a number of sleeves 41 are installed at intervals on the main line harness 1 and / or the branch line harness 2, and clips 42 are spliced ​​on the sleeves 41. For splicing, screw holes or sockets can be set on the sleeves 41, and then one end of the clip 42 is connected to the corresponding screw hole or socket through a bolt or an insert. The clip 42 is used to be plugged into the reserved hole of the car body. The sleeves 41 and the clips 42 are set according to needs, and the main line harness 1 and the branch line harness 2 can be effectively laid out along the inner wall of the car.

[0024] In a specific embodiment, the present invention further discloses a wiring harness protection structure, referring to Figure 1 As shown, it is used to be assembled on the branch wiring harness 2. The wiring harness protection structure includes a protective shell 51, and at least one serpentine groove 52 is arranged in the protective shell 51; a guide plate 6 is installed at the bending part of the serpentine groove 52, one end of the guide plate 6 is inserted in the protective shell 51, and the other end is installed with a roller 61, and the roller 61 can be set to be movable or fixed according to needs. The movable roller 61 can reduce the friction between the branch wiring harness 2 and the branch wiring harness 2 through its own movement; the guide plate 6 is used to guide the branch wiring harness 2 to bend and change direction; the guide plate 6 is configured to retract into the protective shell 51 when under pressure, so as to increase the space at the bending part and increase the angle of the branch wiring harness 2 at the bending part.

[0025] The protective shell 51 is also equipped with a cover plate 53, and a convex strip 54 is provided on the cover plate 53 at a position corresponding to the serpentine groove 52. When the cover plate 53 is assembled on the protective shell 51, the convex strip 54 is inserted into the corresponding serpentine groove 52 to reduce the activity space of the branch line harness 2 arranged in the serpentine groove 52 toward the opening direction of the serpentine groove 52, thereby improving the stability of the arrangement of the branch line harness 2; In a specific embodiment, reference Figure 3-Figure 5As shown, taking two serpentine grooves 52 connected in series as an example, the number of serpentine grooves 52 can be set according to demand, a receiving groove 55 is provided in the protective shell 51, one end of the guide plate 6 is inserted into and slidably installed in the receiving groove 55, and a spring 7 is installed between the guide plate 6 and the inner wall of the receiving groove 55, and the spring 7 tends to drive the guide plate 6 to move along the receiving groove 55 and extend the guide plate 6; and the initial state of the guide plate 6 is that the guide plate 6 is at least partially retracted into the receiving groove 55, and a limit member is installed in the receiving groove 55, and the limit member is used to lock or unlock the state of the guide plate 6.

[0026] The branch line harness 2 is laid out along the serpentine groove 52, wherein the protective shell 51 is located between two adjacent serpentine grooves 52 and has a plurality of forked grooves 56, one end of each forked groove 56 extends out of the protective shell 51, and the branch line harness 2 enters the protective shell 51 from any extended end of the serpentine groove 52 or any extended end of the forked groove 56, and extends out of the protective shell 51 from any extended end of the serpentine groove 52 or any extended end of the forked groove 56; by Figure 5 For example, the branch harness 2 enters from one end of a serpentine groove 52 and is led out from the outlet end of another serpentine groove 52. The branch harness 2 in the serpentine groove 52 is guided and bent by a plurality of guide plates 6. In the initial state, the guide plate 6 is retracted into the receiving groove 55. At this time, the branch harness 2 is arranged in a straight line in the serpentine groove 52. At this time, the lead-out end of the branch harness 2 is in the longest state. When the terminal of the branch harness 2 is assembled with the electrical equipment, the guide plate 6 is unlocked by triggering the limiter. Under the action of the spring 7, the guide plate 6 is prompted to extend out of the receiving groove 55, and the branch harness 2 is gradually bent, thereby pulling one side of the lead-out end of the branch harness 2, so that it is gradually received in the protective shell 51. An annular cylinder is installed at the port where the serpentine groove 52 extends out of the protective shell 51 or the port where the branch groove 56 extends out of the protective shell 51, which is used to guide the entry and exit of the branch line harness 2, wherein the annular cylinder includes an inner cylinder 81 and an outer cylinder 82, one end of the outer cylinder 82 is fixed on the protective shell 51, and the inner cylinder 81 is slidably arranged in the outer cylinder 82, and can be extended or retracted into the outer cylinder 82 for movement, and an elastic strip 83 is connected between the end of the inner cylinder 81 away from the outer cylinder 82 and the protective shell 51, which is used to elastically reset the inner cylinder 81 so that it slides into the outer cylinder 82, and a ball 84 is arranged on the inner wall of the inner cylinder 81 to reduce the friction between the inner cylinder 81 and the branch line harness 2.

[0027] In a specific embodiment, reference Figure 5-Figure 6As shown, a cavity 62 is provided in the guide plate 6, and a piston rod structure 63 is installed in the cavity 62, one end of the piston rod structure 63 is connected to the inner wall of the receiving groove 55; and an air hole 64 connected to the cavity 62 is opened on the guide plate 6, and the piston rod structure 63 is configured to extend into the cavity 62 when the spring 7 is compressed, and discharge the gas in the cavity 62 through the air hole 64; when the spring 7 is reset, it extends out of the cavity 62, and the gas is introduced into the cavity 62 through the air hole 64.

[0028] When the guide plate 6 is unlocked, the spring 7 controls the guide plate 6 to extend. At this time, the air hole 64 is used for ventilation to slow down the extension speed of the guide plate 6 to prevent the speed spring 7 from causing pulling damage to the branch wiring harness 2 due to excessive speed. At the same time, when the lead-out end of the branch wiring harness 2 has a pulling force, the exhaust of the air hole 64 cooperates with the spring 7 to further buffer the pulling force of the branch wiring harness 2.

[0029] In a specific embodiment, reference Figure 4 As shown, the limiting member includes a first protrusion 91 and a second protrusion 92, a groove 57 is opened in the receiving groove 55, the first protrusion 91 is slidably installed in the groove 57, and an elastic member 93 is installed on the first protrusion 91, the elastic member 93 tends to drive the first protrusion 91 to extend out of the groove 57 in the direction of the guide plate 6; the second protrusion 92 is installed on the side of the guide plate 6 facing the first protrusion 91, and the second protrusion 92 is installed close to the roller shaft 61; and the first protrusion 91 is configured as follows: when retracted into the groove 57, the restriction on the second protrusion 92 is released, and the elastic member 93 moves along the receiving groove 55 and extends out of the guide plate 6 under the action of the elastic force of the spring 7; when extending out of the groove 57, a blockage is formed on the second protrusion 92, and the movement along the receiving groove 55 to extend out of the guide plate 6 is restricted.

[0030] Based on the above, in this embodiment, reference Figure 4 and Figure 7 As shown, slide grooves 10 are provided on two opposite surfaces of the serpentine groove 52, and sliders 11 are installed in the slide grooves 10. Slots 15 are provided on the two sliders 11. The branch harness 2 is inserted into the slots 15 through the sleeve plate 41, so that when the branch harness 2 is displaced by force, the sliders 11 are displaced synchronously; a diagonal support plate 12 is installed on the end of the slider 11 facing the terminal of the branch harness 2, and the diagonal support plate 12 is used to support the branch harness 2, can clamp and guide the movement of the branch harness 2 to a certain extent, and disengage at least part of the branch harness 2 from contact with the inner wall of the serpentine groove 52; a rope 13 is installed on the end of the slide groove 10 facing the terminal of the branch harness 2, one end of the rope 13 is fixed in the protective shell 51, and the other end is connected to the first protrusion 91, and a top block 14 is installed on the end of the slider 11 facing the terminal of the branch harness 2, and the top block 14 is used to move with the slider 11, contact and squeeze the rope 13, so that the first protrusion 91 compresses the elastic member 93 to move.

[0031] The slider 11 is arranged to slide synchronously with the branch wiring harness 2, thereby avoiding mutual friction between the branch wiring harness 2 and the inner wall of the serpentine groove 52. At the same time, through the action of the top block 14, in the initial state, the lead-out end of the branch wiring harness 2 is in the longest state. At this time, the slider 11 is close to the rope 13. When the branch wiring harness 2 is connected to the electrical equipment, the slider 11 can continue to slide by involving the branch wiring harness 2. At this time, the top block 14 contacts and squeezes the rope 13. The rope 13 pulls the first protrusion 91 to compress the elastic member 93 to move. The elastic member 93 can adopt a spring 7 structure sleeved on the first protrusion 91, or other structures with elastic reset function. When the first protrusion 91 moves, it will separate from the second protrusion 92 to achieve unlocking of the guide plate 6. The operation is simple and convenient.

[0032] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. For ordinary technicians in this technical field, after knowing the contents recorded in the present invention, they can make several equivalent changes and substitutions without departing from the principle of the present invention. These equivalent changes and substitutions should also be regarded as belonging to the protection scope of the present invention.

Claims

1. A wiring harness, comprising a main wiring harness and a branch wiring harness branching off from the main wiring harness, characterized in that: A bifurcated fixing structure is installed between the main line harness and the branch line harness, and the bifurcated fixing structure has a first supporting portion and a second supporting portion, and the first supporting portion and the second supporting portion are respectively arranged at the bifurcation of the main line harness and located on both sides of the branch line harness; as well as The first support part and the second support part are both airbag structures, and the first support part and the second support part are connected by an intermediate sleeve, and the intermediate sleeve is configured to guide the internal airflow of the first support part or the second support part toward the corresponding second support part or the first support part when the first support part or the second support part is under pressure; The first supporting portion and / or the second supporting portion is in a non-filled state, and the total amount of gas in the first supporting portion and the second supporting portion at least satisfies that the first supporting portion or the second supporting portion is in a filled state.

2. A wiring harness according to claim 1, characterized in that: The first supporting portion and the second supporting portion are both provided with through holes, and the through holes are configured to adjust the shape of the corresponding first supporting portion or second supporting portion through deformation.

3. A wiring harness according to claim 2, characterized in that: The bifurcated fixing structure further includes a restraining belt, which is configured to pass through the through hole in an open state and be wound around the intermediate sleeve to interrupt the conduction between the intermediate sleeve and the first supporting portion and the second supporting portion.

4. A wiring harness according to claim 1, characterized in that: A plurality of sleeves are installed at intervals on the main line harness and / or the branch line harness, and clips are spliced ​​on the sleeves, and the clips are used to be plugged into the reserved holes of the automobile body.

5. A wiring harness protection structure, used for assembly on a branch wiring harness, characterized in that: It includes a protective shell, in which at least one section of serpentine groove is arranged; a guide plate is installed at the bending part of the serpentine groove, one end of the guide plate is inserted into the protective shell, and the other end is installed with a roller and is used to guide the branch line harness to bend and change direction. The guide plate is configured to retract into the protective shell when under pressure, so as to increase the space at the bending part and increase the angle at the bending part of the branch line harness.

6. A wire harness protection structure according to claim 5, characterized in that: A receiving groove is provided in the protective shell, one end of the guide plate is inserted and slidably installed in the receiving groove, and a spring is installed between the guide plate and the inner wall of the receiving groove, and the spring tends to drive the guide plate to move along the receiving groove and extend out of the guide plate; as well as The initial state of the guide plate is that the guide plate is at least partially retracted into the receiving groove, and a limiting member is installed in the receiving groove, and the limiting member is used to lock or unlock the state of the guide plate.

7. A wire harness protection structure according to claim 6, characterized in that: A cavity is provided in the guide plate, a piston rod structure is installed in the cavity, and one end of the piston rod structure is connected to the inner wall of the receiving groove; and The guide plate is provided with an air hole connected to the cavity, and the piston rod structure is configured to extend into the cavity when the spring is compressed and discharge the gas in the cavity through the air hole, and extend out of the cavity when the spring is reset and introduce gas into the cavity through the air hole.

8. The wire harness protection structure according to claim 6, characterized in that: The limiting member comprises: A first protrusion, wherein a groove is provided in the receiving slot, the first protrusion is slidably mounted in the groove, and an elastic member is mounted on the first protrusion, the elastic member tends to drive the first protrusion to extend out of the groove toward the guide plate; A second protrusion is installed on a side of the guide plate facing the first protrusion, and the second protrusion is installed close to the roller shaft; and The first bump is configured as: When retracted into the groove, the restriction on the second protrusion is released, and the elastic member moves along the receiving groove under the action of the spring force and extends out of the guide plate; When extending out of the groove, the second protrusion is blocked and the guide plate is restricted from moving out of the receiving groove.

9. A wire harness protection structure according to claim 8, characterized in that: Slide grooves are provided on two opposite surfaces of the serpentine groove, and sliders are installed in the slide grooves. Slots are provided on the two sliders, and the branch harness is inserted into the slots through the sleeve plate, so that when the branch harness is displaced by force, the sliders are displaced synchronously; a diagonal support plate is installed on one end of the slider facing the branch harness terminal, and the diagonal support plate is used to support the branch harness and separate at least part of the branch harness from contacting the inner wall of the serpentine groove; A rope is installed at one end of the slide groove facing the branch wiring harness terminal, one end of the rope is fixed in the protective shell, and the other end is connected to the first protrusion. A top block is installed at one end of the slider facing the branch wiring harness terminal, and the top block is used to move with the slider, contact and squeeze the rope, so that the first protrusion compresses the elastic member to move.

10. The wire harness protection structure according to claim 5, characterized in that: A plurality of serpentine grooves connected in series are arranged in the protective shell, a plurality of branch grooves are opened in the protective shell between two adjacent serpentine grooves, one end of each branch groove extends out of the protective shell, and the branch line beam enters the protective shell from any serpentine groove extension end or any branch groove extension end, and extends out of the protective shell from any serpentine groove extension end or any branch groove extension end.

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