Mounting structure of electric vehicle safe driving central control assembly

Abstract

The invention relates to the technical field of electric vehicle assembly, in particular to a mounting structure of an electric vehicle safe driving center control assembly. The problem that after a central control screen is installed, redundant wiring harnesses are prone to causing looseness of the connecting position between the wiring harnesses and the central control screen under the external influence is solved. Comprising a mounting shell, a rotating cover is rotationally connected to the mounting shell, electric sliding rails which are evenly distributed are arranged in the mounting shell, first sliding blocks which are distributed in a mirror image mode and second sliding blocks which are distributed in a mirror image mode are slidably connected to the interior of the mounting shell, and the first sliding blocks and the second sliding blocks are fixedly connected with sliding blocks in the adjacent electric sliding rails on the mounting shell respectively; the first sliding blocks distributed in the mirror image mode and the second sliding blocks distributed in the mirror image mode are rotationally connected with tidying rods. According to the invention, after the wiring harness joint and the central control screen are connected, redundant wiring harnesses are arranged through the arrangement rod, so that free movement of other parts of the wiring harnesses is prevented, the connection strength between the wiring harness joint and the central control screen is not influenced, and the driving safety is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of electric vehicle assembly technology, and in particular to an installation structure for a central control component for safe driving in an electric vehicle. Background Technology

[0002] The central control screen is the core interactive interface and visual focus of the central control components. It deeply integrates many functions such as vehicle control, navigation, audio-visual entertainment and intelligent driving information display, and interacts with users through intuitive methods such as touch and intelligent voice. Finally, through continuous OTA upgrades, it continuously optimizes the experience and adds new functions, becoming a key carrier for creating a personalized mobile intelligent space.

[0003] In the current installation process for central control screens, the wiring harness must first be connected to the screen, and then secured to the center console using clips and screws. To facilitate wiring, the wiring harness is usually designed to be longer than the mounting recess of the central control screen. However, this also results in excess wiring accumulating behind the central control screen after installation. If the vehicle vibrates while driving, the accumulated wiring will wobble, weakening the connection reliability between it and the central control screen over time, causing abnormal screen display issues such as screen flickering. If the wiring harness becomes completely loose, it can also produce abnormal noises and even affect the normal function of the central control screen, not only reducing the driving experience but also posing a potential threat to driving safety. Summary of the Invention

[0004] To overcome the above-mentioned shortcomings, an installation structure for a central control component for safe driving in electric vehicles is provided.

[0005] The technical solution is as follows: An installation structure for a central control component for safe driving of an electric vehicle includes a mounting shell, a rotating cover rotatably connected to the mounting shell, uniformly distributed electric slide rails inside the mounting shell, and a first sliding block and a second sliding block slidably connected inside the mounting shell. The first sliding block and the second sliding block are respectively fixedly connected to sliders in adjacent electric slide rails on the mounting shell, and both the first sliding block and the second sliding block are rotatably connected to a leveling rod.

[0006] Furthermore, friction strips arranged in a circumferential array are fixedly connected to the regularized rod.

[0007] Furthermore, both the first sliding block and the second sliding block are splined with rotating shells, the leveling rod is fixed with a mirror-distributed first rotating ring, the leveling rod is rotatably connected with a mirror-distributed rotating plate, the rotating shell and the first rotating ring are provided with circumferentially arrayed pressing blocks for limiting the first rotating ring and the adjacent rotating shell, and a tension spring is provided between the rotating shell and the adjacent rotating plate.

[0008] Furthermore, both the first sliding block and the second sliding block are provided with liquid storage chambers. A squeezing rod is threadedly connected to the rotating cover. A squeezing chamber is provided on the mounting shell. A connecting pipe is fixedly connected to the mounting shell. The squeezing chamber is connected to all the liquid storage chambers through the connecting pipe. A piston rod is slidably connected in the squeezing chamber. The piston rod is dynamically sealed to the squeezing chamber. A tension spring is provided between the piston rod and the mounting shell. The squeezing rod is used to push the piston rod.

[0009] Furthermore, the rotating cover is threadedly connected to a rectangular array of threaded sleeves, the threaded sleeves are splinedly connected to threaded rods, the mounting shell is slidably connected to a rectangular array of fastening blocks, the fastening blocks are threadedly connected to adjacent threaded rods, the threaded sleeves are slidably connected to a power rod, and the power rod is fixedly connected to the threaded rod.

[0010] Furthermore, it also includes a receiving frame, which is slidably connected to the mounting shell. A sliding plate is slidably connected inside the mounting shell. The receiving frame is provided with several bending parts. A sliding frame is slidably connected to the sliding plate. A fixed block is provided near the bending part of the sliding frame. An arc groove is provided on the fixed block. A second rotating ring is slidably connected inside the arc groove of the fixed block.

[0011] Furthermore, the sliding plate is fixedly connected to an electric push rod, the sliding plate is rotatably connected to a rotating sleeve, the rotating sleeve is threadedly connected to a limit frame, the limit frame is slidably connected to the sliding frame, the telescopic end of the electric push rod is fixedly connected to a fixing plate, the limit frame is used to block the fixing plate, and a spring is provided between the fixing plate and the sliding frame.

[0012] Furthermore, a first airbag is fixedly connected to the second rotating ring, and a second airbag is fixedly connected to the bent portion.

[0013] Furthermore, the width of the second airbag is twice the width of the first airbag.

[0014] Furthermore, the central angle of the arc groove on the fixing block is greater than 180° and less than 270°.

[0015] The beneficial effects are as follows: After the wiring harness connector and the central control screen are connected, the straightening rod straightens the excess wiring harness, preventing the rest of the wiring harness from moving freely and affecting the connection strength between the wiring harness connector and the central control screen, thus ensuring driving safety; the fastening block and threaded sleeve first press the connection between the central control screen and the rotating cover before connecting the central control screen and the rotating cover, and after connection, the fastening block, threaded rod and threaded sleeve work together to fix the central control screen in multiple layers, reducing the probability of the central control screen loosening due to vibration; the inflated first airbag and inflated second airbag compress and fix the wiring harness, isolating it when other parts of the wiring harness fluctuate, preventing the fluctuation (shaking or vibration) of the wiring harness from affecting the connection strength between the wiring harness connector and the central control screen, thus improving the practicality of the device. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional structural diagram of the internal structure of the mounting shell of the present invention; Figure 3 This is a three-dimensional structural diagram of the first sliding block and the regulating rod of the present invention; Figure 4 This is a three-dimensional structural diagram of the internal structure of the first sliding block of the present invention; Figure 5 This is a three-dimensional structural cross-sectional view of the rotating shell of the present invention; Figure 6 This is a three-dimensional structural diagram of the extrusion rod and extrusion chamber of the present invention; Figure 7 This is a three-dimensional sectional view of the threaded sleeve and fastening block of the present invention; Figure 8 This is a three-dimensional structural diagram of the support frame and bending part of the present invention; Figure 9 This is a three-dimensional structural cross-sectional view of the fixing block and the second rotating ring of the present invention; Figure 10 This is a three-dimensional structural cross-sectional view of the rotating sleeve and limiting frame of the present invention.

[0017] Reference numerals: 1. Mounting shell, 2. Rotating cover, 3. First sliding block, 4. Second sliding block, 5. Adjusting rod, 6. Friction strip, 7. Rotating shell, 8. First rotating ring, 9. Rotating plate, 10. Liquid storage chamber, 11. Extrusion rod, 12. Extrusion chamber, 13. Connecting pipe, 14. Piston rod, 15. Threaded sleeve, 16. Threaded rod, 17. Fastening block, 18. Power rod, 19. Support frame, 20. Sliding plate, 21. Bending part, 22. Sliding frame, 23. Fixing block, 24. Second rotating ring, 25. Electric push rod, 26. Rotating sleeve, 27. Limiting frame, 28. Fixing plate, 29. First airbag, 30. Second airbag. Detailed Implementation

[0018] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. Example 1

[0019] This embodiment discloses an installation structure for a central control component for safe driving in electric vehicles, which is used to organize the wiring harness behind the central control screen after the screen is installed.

[0020] The specific structure and connection relationships of this installation structure are as follows (the following description uses only two wire harnesses as an example): like Figures 1-5 As shown, the mounting structure includes a mounting shell 1, a rotating cover 2 rotatably connected to the front of the mounting shell 1, a groove for fitting the central control screen on the rear side of the rotating cover 2, four evenly distributed electric slide rails inside the mounting shell 1, arranged in a mirror image of each other on the left and right, two first sliding blocks 3 and two second sliding blocks 4 slidably connected inside the mounting shell 1, the first sliding blocks 3 and the second sliding blocks 4 being fixedly connected to the sliders in the adjacent electric slide rails on the mounting shell 1, and a calibrating rod 5 rotatably connected between each of the two first sliding blocks 3 and the two second sliding blocks 4, there are two calibrating rods 5 in total, the front calibrating rod 5 is located below the rear calibrating rod 5, and friction strips 6 arranged in a circumferential array are fixedly connected to the calibrating rod 5, the friction strips 6 being made of soft material, used to improve the interaction force between the calibrating rod 5 and the wire harness.

[0021] like Figures 3-7 As shown, both the first sliding block 3 and the second sliding block 4 are splinedly connected to rotating shells 7. A mirror-distributed first rotating ring 8 is fixed to the leveling rod 5. Rotating plates 9 are rotatably connected to both sides of the leveling rod 5. The rotating plates 9 on the same leveling rod 5 are mirror-distributed. A circumferentially arrayed pressing block is provided on the opposite side of the rotating shell 7 and the adjacent first rotating ring 8 to limit the mutual positioning of the first rotating ring 8 and the adjacent rotating shell 7. The pressing block has a mirror-distributed inclined surface. A tension spring is provided between the rotating shell 7 and the adjacent rotating plate 9, and this tension spring is always in a stretched state. Both the first sliding block 3 and the second sliding block 4 are provided with a liquid storage cavity 10. The rotating cover 2 is threadedly connected to... There is a squeezing rod 11, and a squeezing chamber 12 is provided on the mounting shell 1. All the liquid storage chambers 10 and the squeezing chamber 12 are filled with hydraulic oil. The mounting shell 1 is fixedly connected to a connecting pipe 13. The squeezing chamber 12 is connected to all the liquid storage chambers 10 through the connecting pipe 13. The connection between the connecting pipe 13 and the first sliding block 3 and the second sliding block 4 is a multi-stage telescopic pipe (existing mechanism, not shown in the figure). A piston rod 14 is slidably connected in the squeezing chamber 12. The piston rod 14 and the squeezing chamber 12 are dynamically sealed. A tension spring is provided between the piston rod 14 and the mounting shell 1. The tension spring between the two is always in a stretched state to ensure the stability of the hydraulic oil pressure in the squeezing chamber 12. The squeezing rod 11 is used to push the piston rod 14.

[0022] like Figure 1 , Figure 6 and Figure 7 As shown, the rotating cover 2 is threadedly connected to four threaded sleeves 15 arranged in a rectangular array. The threaded sleeves 15 are splinedly connected to threaded rods 16. The mounting shell 1 is slidably connected to fastening blocks 17 arranged in a rectangular array. The fastening block 17 consists of an L-shaped rigid plate and an L-shaped elastic plate. The rigid plate part of the fastening block 17 is located behind the elastic plate part of the fastening block 17. The rigid plate part of the fastening block 17 is threadedly connected to the adjacent threaded rods 16. The threaded sleeves 15 are slidably connected to a power rod 18 that is fixed to the threaded rods 16.

[0023] The working process of the installation structure in this embodiment is as follows: Preparation process: First, fix the mounting shell 1 to the designated position on the center console with bolts, and then thread the wiring harness into the mounting shell 1. Then, pass the wiring harness between the upper and lower alignment rods 5, and adjust the position of the fastening block 17 inside the mounting shell 1 according to the required thickness of the center console screen. The preparation process is complete.

[0024] Working process: When installing the central control screen, the user first opens the rotating cover 2, then inserts the central control screen into the back of the rotating cover 2, and pulls the wiring harness out one by one from the mounting shell 1 and installs it to the back of the central control screen. The user then rotates the rotating cover 2 in the opposite direction to reset it, pushing the wiring harness back into the mounting shell 1. The user then uses the slider on the electric slide rail inside the mounting shell 1 to move the two first sliding blocks 3 upwards and the two second sliding blocks 4 downwards (i.e., the two alignment rods 5 move in opposite directions). During this process, taking the lower alignment rod 5 as an example, as the alignment rod 5 moves upwards, it first contacts the wiring harness. As the alignment rod 5 continues to move downwards... As the wire harness moves upward, the straightening rod 5 causes the entire harness to bend upward, forming an inverted U-shaped indentation. During this process, the straightening rod 5 and the friction strip 6 work together to rotate the straightening rod 5, preventing excessive stretching of one side of the harness and thus affecting the connection strength. This continues until the two straightening rods 5 have straightened the harness (i.e., there are no more freely moving parts in the harness). Then, the two first sliding blocks 3 and two second sliding blocks 4 stop moving. After the harness connector is connected to the central control screen, the straightening rod 5 straightens the excess harness, preventing the remaining parts of the harness from moving freely and affecting the connection strength between the harness connector and the central control screen, thus ensuring driving safety.

[0025] During the rotation of the aforementioned regulating rod 5, with Figure 4For example, the alignment rod 5 drives the first rotating ring 8 to rotate synchronously. The first rotating ring 8 drives the extrusion blocks arranged in a circumferential array to rotate together and extrude the rotating shell 7 to the right. The rotating shell 7 moves to the right and extrudes the piston rod 14 forward through the hydraulic oil in the reservoir 10 and the connecting pipe 13. At the same time, it stretches the tension spring between the piston rod 14 and the mounting shell 1. The tension spring between the two ensures that the rotating shell 7 and the first rotating ring 8 are always in a state of extrusion contact until the two alignment rods 5 stop moving upward. The user installs the extrusion rod 11 on the rotating cover 2 and rotates the extrusion rod 11 to move it backward until the extrusion rod 11 contacts and extrudes the piston rod 14. At this time, the piston rod 14 can hardly move forward (that is, the rotating shell 7 and the first rotating ring 8 are difficult to separate at this time, and the rotation of the alignment rod 5 is locked), ensuring the stability between the alignment rod 5 and the wire harness during normal use.

[0026] After the above preparations are completed, the user will install the four threaded sleeves 15 and their parts one by one, so as to... Figure 6 Taking the threaded sleeve 15 as an example, the user first uses the power rod 18 to push the threaded rod 16 backward, so that it first contacts the fastening block 17 (at this time, the thread on the threaded sleeve 15 is not engaged with the adjacent thread on the rotating cover 2). The fastening block 17 is limited by the mounting shell 1 and will not move backward. Then the user rotates the power rod 18, which drives the threaded rod 16 to rotate. The threaded rod 16 drives the fastening block 17 forward through the thread until the elastic part on the front side of the fastening block 17 contacts the central control screen. The user continues to rotate the power rod 18 to ensure that the central control screen and the rotating cover 2 fit tightly (this process will squeeze the elastic part on the front side of the fastening block 17). Then the user moves the threaded sleeve 15 backward so that its thread engages with the adjacent thread on the rotating cover 2. With the threads engaged, continue rotating the power rod 18. The power rod 18 drives the threaded sleeve 15 to rotate via the spline of the threaded rod 16. The threaded sleeve 15 gradually screws backward. During this process, the threaded sleeve 15 simultaneously engages with the threaded hole on the central control screen and continuously squeezes the elastic part on the front side of the fastening block 17, thereby further improving the installation strength of the central control screen. After installing all four threaded sleeves 15 according to the above steps, the central control screen installation is complete. The connection between the central control screen and the rotating cover 2 is first pressed by the fastening block 17 in conjunction with the threaded sleeve 15, and then the central control screen is connected to the rotating cover 2. After connection, the fastening block 17, the threaded rod 16, and the threaded sleeve 15 work together to fix the central control screen in multiple layers, reducing the probability of the central control screen loosening due to vibration. Example 2

[0027] This embodiment discloses an installation structure for a central control component for safe driving in an electric vehicle, which is a further improvement on embodiment 1.

[0028] The structure, connection relationship and working process of the installation structure in Example 1 will not be described again. The working principle of the following structure will be explained in detail. The same applies to subsequent examples.

[0029] like Figure 1 , Figure 2 and Figures 8-10 As shown, it also includes a support frame 19, which is slidably connected to the mounting housing 1. A sliding plate 20 is slidably connected inside the mounting housing 1. The mounting housing 1 is provided with mirror-distributed power components (not shown in the figure), which are used to drive the support frame 19 and the sliding plate 20 to move back and forth. The support frame 19 is provided with several bends 21, which are U-shaped. The sliding plate 20 is slidably connected to a sliding frame 22. Mirror-distributed fixing blocks 23 are provided on the upper side of the sliding frame 22 near the bends 21. This paper describes two bends 21 and four fixing blocks 23 as an example. The fixing blocks 23 are provided with arc grooves. A second rotating ring 24 is slidably connected in the arc grooves of the fixing blocks 23. An electric push rod 25 is fixed to the sliding plate 20. A rotating sleeve 26 is rotatably connected to the upper side of the sliding plate 20. The upper outer side of the sleeve 26 is threaded. The rotating sleeve 26 is threadedly connected to a limiting frame 27 that is slidably connected to the sliding frame 22. The telescopic end of the electric push rod 25 is fixedly connected to a fixing plate 28. The limiting frame 27 is used to block the fixing plate 28. A spring is provided between the fixing plate 28 and the sliding frame 22. A first airbag 29 is fixedly connected to the second rotating ring 24. A second airbag 30 is fixedly connected to the bent part 21. Both the first airbag 29 and the second airbag 30 are semi-circular rings, and their expansion volume can be changed according to the user's wishes based on the inflation volume. The width of the second airbag 30 is twice the width of the first airbag 29 to ensure the stability of the force applied to the wire harness in the vertical direction. The central angle of the arc groove on the fixing block 23 is greater than 180° and less than 270°, so that the adjacent fixing blocks 23 have a stable force application point when the second rotating ring 24 is pulled down.

[0030] The working process of the installation structure in this embodiment is as follows: Working process: When installing the wiring harness onto the central control screen, the user first passes the wiring harness through the bend 21. At this time, the wiring harness is located above the first airbag 29 and the second airbag 30. The position of the limiting bracket 27 is adjusted according to the size of the wiring harness (the size of the wiring harness is inversely proportional to the height of the limiting bracket 27). The position of the limiting bracket 27 can be adjusted by rotating the rotating sleeve 26. The wiring harness connector is then connected to the central control screen. Subsequently, the user rotates the second rotating ring 24 180°. The second rotating ring 24 drives the first airbag 29 on it to rotate 180° synchronously. At this time, the two first airbags 29 and the adjacent second airbag 30 wrap around the wiring harness. The user inflates the two first airbags 29 and the adjacent second airbag 30, causing the first airbags 29 and the second airbag 30 to expand according to the diameter of the wiring harness (only wrapping is required). Then, the steps of the above embodiment are repeated. After installation, the wiring harness is straightened under the alignment. The user drives the receiving bracket 19 and the sliding plate 20 to move forward together through the power element on the mounting shell 1. The sliding plate 20 carries... The sliding frame 22 and its components move forward until the first airbag 29 and the second airbag 30 move forward and contact the rear side of the wire harness connector. At this point, the receiving frame 19 and the sliding plate 20 stop moving. Then, the user controls the telescopic end of the electric push rod 25 to retract. The telescopic end of the electric push rod 25 drives the fixing plate 28 to move downward. The fixing plate 28 drives the sliding frame 22 and its components downward through the spring, thereby securing the wire harness with the first airbag 29 and the second airbag 30. When the fixing plate 28 contacts the limiting frame 27, the user controls the telescopic end of the electric push rod 25 to stop moving. At this time, the first airbag 29 and the second airbag 30 cooperate to fix the wire harness connector, thereby ensuring the stability of the connection between the wire harness and the central control screen. The expansion of the first airbag 29 and the expansion of the second airbag 30 compresses and fixes the wire harness, isolating any fluctuations in other parts of the wire harness, preventing the fluctuations (shaking or vibration) of the wire harness from affecting the connection strength between the wire harness connector and the central control screen, thus improving the practicality of this device.

[0031] The technical principles of the embodiments of the present invention have been described above with reference to specific examples. These descriptions are merely for explaining the principles of the embodiments of the present invention and should not be construed as limiting the scope of protection of the embodiments of the present invention in any way. Based on the explanation herein, those skilled in the art can conceive of other specific embodiments of the present invention without creative effort, and these embodiments will all fall within the scope of protection of the embodiments of the present invention.

Claims

1. An installation structure for a central control component for safe driving in an electric vehicle, characterized in that: It includes a mounting shell (1), on which a rotating cover (2) is rotatably connected. The mounting shell (1) is provided with evenly distributed electric slide rails. The mounting shell (1) is slidably connected with a first sliding block (3) and a second sliding block (4) that are mirror-distributed. The first sliding block (3) and the second sliding block (4) are respectively fixed to the sliders in the adjacent electric slide rails on the mounting shell (1). The first sliding block (3) and the second sliding block (4) that are mirror-distributed are both rotatably connected with a leveling rod (5).

2. The installation structure of the electric vehicle safety driving central control component according to claim 1, characterized in that: The regular rod (5) is fixed with friction strips (6) arranged in a circumferential array.

3. The installation structure of the electric vehicle safety driving central control component according to claim 2, characterized in that: Both the first sliding block (3) and the second sliding block (4) are splined with rotating shells (7). The leveling rod (5) is fixed with a mirror-distributed first rotating ring (8). The leveling rod (5) is rotatably connected with a mirror-distributed rotating plate (9). Both the rotating shell (7) and the first rotating ring (8) are provided with circumferentially arrayed pressing blocks, which are used to limit the first rotating ring (8) and the adjacent rotating shell (7) to each other. A tension spring is provided between the rotating shell (7) and the adjacent rotating plate (9).

4. The installation structure of the electric vehicle safety driving central control component according to claim 3, characterized in that: Both the first sliding block (3) and the second sliding block (4) are provided with a liquid storage chamber (10). The rotating cover (2) is threaded with a squeezing rod (11). The mounting shell (1) is provided with a squeezing chamber (12). The mounting shell (1) is fixedly connected with a connecting pipe (13). The squeezing chamber (12) is connected to all the liquid storage chambers (10) through the connecting pipe (13). A piston rod (14) is slidably connected in the squeezing chamber (12). The piston rod (14) is dynamically sealed to the squeezing chamber (12). A tension spring is provided between the piston rod (14) and the mounting shell (1). The squeezing rod (11) is used to push the piston rod (14).

5. The installation structure of the electric vehicle safety driving central control component according to claim 4, characterized in that: The rotating cover (2) is threaded with a rectangular array of threaded sleeves (15), the threaded sleeves (15) are splined with threaded rods (16), the mounting shell (1) is slidably connected with a rectangular array of fastening blocks (17), the fastening blocks (17) are threadedly connected to the adjacent threaded rods (16), the threaded sleeves (15) are slidably connected with a power rod (18), and the power rod (18) is fixedly connected to the threaded rods (16).

6. The installation structure of the electric vehicle safety driving central control component according to claim 5, characterized in that: It also includes a support frame (19), which is slidably connected to the mounting shell (1). A sliding plate (20) is slidably connected inside the mounting shell (1). The support frame (19) is provided with several bends (21). A sliding frame (22) is slidably connected to the sliding plate (20). A fixed block (23) is provided near the bends (21) of the sliding frame (22). A circular arc groove is provided on the fixed block (23). A second rotating ring (24) is slidably connected inside the circular arc groove of the fixed block (23).

7. The installation structure of the electric vehicle safety driving central control component according to claim 6, characterized in that: The sliding plate (20) is fixedly connected to an electric push rod (25), and the sliding plate (20) is rotatably connected to a rotating sleeve (26). The rotating sleeve (26) is threadedly connected to a limit frame (27). The limit frame (27) is slidably connected to the sliding frame (22). The telescopic end of the electric push rod (25) is fixedly connected to a fixing plate (28). The limit frame (27) is used to block the fixing plate (28). A spring is provided between the fixing plate (28) and the sliding frame (22).

8. The installation structure of the electric vehicle safety driving central control component according to claim 7, characterized in that: The second rotating ring (24) is fixedly connected to the first airbag (29), and the bent portion (21) is fixedly connected to the second airbag (30).

9. The installation structure of the electric vehicle safety driving central control component according to claim 8, characterized in that: The width of the second airbag (30) is twice the width of the first airbag (29).

10. The installation structure of the electric vehicle safety driving central control component according to claim 9, characterized in that: The central angle of the arc groove on the fixed block (23) is greater than 180° and less than 270°.

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