A tension / compression sensor specifically for electric vehicles

Abstract

This utility model discloses a tension / compression sensor specifically for electric vehicles, comprising a metallic elastomer, a sealing cover, a metal strain gauge, a locking nut, a signal output line, and a connector. The metallic elastomer includes a force-bearing part, a deformation part, and a fixing part arranged sequentially. A transition step A is provided between the force-bearing part and the deformation part, and a transition step B is provided between the deformation part and the fixing part. An annular groove is provided around the transition step B. A deformation beam is provided inside the deformation part, and two symmetrically arranged bridge-type wire-passing holes are provided on the deformation beam. The tension / compression sensor specifically for electric vehicles provided by this utility model can improve the resistance to off-center loads and measurement accuracy, reduce stress concentration in the middle area of ​​the sensor, and enhance dynamic response and signal output.

Description

Technical Field

[0001] This utility model relates to a tension and compression sensor specifically for electric vehicles, and more specifically, belongs to the field of shared electric vehicle technology. Background Technology

[0002] Currently, according to relevant national laws and regulations, shared electric bikes are prohibited from carrying passengers. In order to effectively identify passenger-carrying behavior, shared electric bike companies will install tensile and compressive sensors with weighing functions at the shock absorber position. Generally, they will determine whether a passenger is being carried or overloaded by detecting the weight of the seat load.

[0003] The technical principle of tension and compression sensors falls under the category of resistance strain gauge force sensors. They utilize the elastic strain characteristics of metallic materials, employing the relationship between the resistance change of a metal strain gauge attached to the strain zone and the corresponding force value. For example, a weighing sensor is disclosed in CN202220920466.3.

[0004] The technical solutions disclosed in the aforementioned patent documents still have the following technical problems, based on practical experience:

[0005] The sensor has poor resistance to off-center loads, and the seat cushions of shared electric vehicles are prone to shifting under stress, resulting in low measurement accuracy. Setting a wire hole above the partition disperses the stress in the central area of ​​the sensor, leading to a smaller output signal.

[0006] In conclusion, the existing technology obviously has inconveniences and defects in practical use, so it is necessary to improve it. Utility Model Content

[0007] This invention addresses the shortcomings of the prior art by providing a tension and compression sensor specifically for electric vehicles, which can improve the resistance to off-center loads and measurement accuracy, reduce stress concentration in the middle area of ​​the sensor, and enhance dynamic response and signal output.

[0008] To solve the above technical problems, the present invention adopts the following technical solution:

[0009] A tension / compression sensor for electric vehicles includes a metal elastomer, a sealing cover, a metal strain gauge, a locking nut, a signal output line, and a connector. The metal elastomer includes a force-bearing part, a deformation part, and a fixing part arranged sequentially. A transition step A is provided between the force-bearing part and the deformation part, and a transition step B is provided between the deformation part and the fixing part. An annular groove is provided around the transition step B. A deformation beam is provided inside the deformation part, and two bridge wire holes are symmetrically arranged on the deformation beam.

[0010] Furthermore, the transition step A, the deformation part, the transition step B, and the fixing part are all cylindrical structures.

[0011] Furthermore, at least one of the four structures—transition step A, deformation part, transition step B, and fixing part—is a square structure.

[0012] Furthermore, the force-bearing part includes an outer ring support, which is chamfered and has two U-shaped grooves symmetrically distributed inward, which are connected to each other.

[0013] Furthermore, there are symmetrically distributed circuit board placement areas on both sides of the deformable beam, and the opening end of the circuit board placement area is provided with a cover plate groove for sealing cover plate installation.

[0014] Furthermore, the metal strain gauges are symmetrically attached to the center positions on both sides of the deformed beam, with the wire grid region of the metal strain gauges aligned with the center region.

[0015] Furthermore, one of the bridge wire holes is provided with a wire outlet hole and a fixing screw hole A on its exterior.

[0016] Furthermore, one end of the locking nut is installed in the fixing screw hole A, and the other end is connected in sequence with a signal output line and a plug connector.

[0017] Furthermore, the fixing part extends downward to provide a support part for connecting the buffer spring of the shared electric vehicle, and there is an inwardly concave protruding fixing step below the support part.

[0018] Furthermore, the center of the fixed step has a fixing screw hole B for fixed connection with the shock absorber.

[0019] Compared with the prior art, the present invention, by adopting the above technical solution, has the following advantages:

[0020] The upper and lower parts of the deformation section adopt cylindrical transition steps, which can increase the deformation of the intermediate deformation beam and improve the sensor's resistance to eccentric loads.

[0021] The symmetrical distribution of the bridging holes on both sides can improve stress concentration in the middle area of ​​the sensor, thereby enhancing the sensor's dynamic response and signal output.

[0022] The locking nut has a wire outlet hole in front of the fixing screw hole A, which is used to protect the integrity of the intermediate deformation beam and improve the accuracy of the sensor.

[0023] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0024] Figure 1 This is an exploded view of the structure of Example 1;

[0025] Figure 2 This is a schematic diagram of the structure of the metal elastomer in Example 1;

[0026] Figure 3 yes Figure 2 Schematic diagram of the cross section at point BB;

[0027] Figure 4 This is an installation diagram of Example 1;

[0028] Figure 5 This is a schematic diagram of the structure of the metal elastomer in Example 2;

[0029] Figure 6 This is a schematic diagram of the structure of the metal elastomer in Example 3;

[0030] Figure 7 This is a schematic diagram of the structure of the metal elastomer in Example 4;

[0031] Figure 8 This is a schematic diagram of the structure of the metal elastomer in Example 5;

[0032] Figure 9 This is a schematic diagram of the structure of the metal elastomer in Example 6.

[0033] In the diagram, 1-metal elastomer, 11-force-bearing part, 111-outer ring support, 112-U-shaped groove, 12-deformation part, 121-cover plate groove, 122-circuit board placement area, 123-deformation beam, 124-bridge cable hole, 125-fixing screw hole A, 126-outlet hole, 13-fixing part, 131-supporting part, 132-fixing step, 133-fixing screw hole B, 14-transition step A, 15-transition step B; 2-sealing cover plate; 3-metal strain gauge; 4-locking nut; 5-signal output line; 6-connector; 7-tension and compression collar; 8-shock absorber. Detailed Implementation

[0034] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model are now described with reference to the accompanying drawings.

[0035] Example 1

[0036] like Figures 1-4 As shown in the figure, this utility model provides a tension and compression sensor for electric vehicles, including a metal elastomer 1, a sealing cover plate 2, a metal strain gauge 3, a locking nut 4, a signal output line 5, and a connector 6.

[0037] The metal elastomer 1 includes a force-receiving part 11, a deformation part 12, and a fixing part 13 arranged sequentially. A transition step A14 is provided between the force-receiving part 11 and the deformation part 12, and a transition step B15 is provided between the deformation part 12 and the fixing part 13. An annular groove is provided around the transition step B15.

[0038] The transition step A14, the deformation part 12, the transition step B15, and the fixing part 13 are all cylindrical structures.

[0039] The force-bearing part 11 includes an outer ring support 111, which is chamfered and has two U-shaped grooves 112 symmetrically distributed inward. The two U-shaped grooves 112 are connected and used to fix the tension and compression collar 7.

[0040] The deformable part 12 has a circular deformable beam 123 inside. There are circuit board placement areas 122 symmetrically distributed on both sides of the deformable beam 123. The opening end of the circuit board placement area 122 is provided with a cover plate groove 121 for installing the sealing cover plate 2.

[0041] Metal strain gauges 3 are symmetrically attached to the center of both sides of the deformation beam 123, with the wire grid area of ​​the metal strain gauges 3 aligned with the center area. The deformation beam 123 is provided with two bridging holes 124 for connecting the two metal strain gauges 3. The bridging holes 124 are symmetrically arranged on the left and right sides. One of the bridging holes 124 has a wire outlet hole 126 and a fixing screw hole A125 on its outside.

[0042] One end of the locking nut 4 is installed in the fixing screw hole A125, and the other end is connected in sequence to the signal output line 5 and the plug connector 6.

[0043] The fixing part 13 extends downward and is provided with a support part 131 for connecting the buffer spring of the shared electric vehicle. Below the support part 131, there is an inwardly concave protruding fixing step 132. The fixing step 132 can position the top of the buffer spring and prevent the spring from shifting to the left or right and popping out. The center of the fixing step 132 has a fixing screw hole B133 for fixing and connecting with the shock absorber 8.

[0044] Working principle:

[0045] The buffer spring and sensor are fixed to the central support shaft of the shared electric vehicle's tire. The other end of the sensor is connected to the seat support area of ​​the shared electric vehicle. When pressure is applied to a point on the seat, the sensor's metal elastomer deforms, and the metal strain gauge attached to the deformation beam generates a change in resistance, forming a Wheatstone bridge internally. The sensor can output a certain mV voltage signal.

[0046] In this invention, the upper and lower parts of the deformation section adopt cylindrical transition steps, which can increase the deformation of the intermediate deformation beam and improve the sensor's resistance to off-center loads.

[0047] The symmetrical distribution of the bridging holes on both sides can improve stress concentration in the middle area of ​​the sensor and increase the signal output of the sensor.

[0048] The locking nut has a wire outlet hole in front of the fixing screw hole A, which is used to protect the integrity of the intermediate deformation beam and improve the accuracy of the sensor.

[0049] The sensor has a columnar structure with blind holes on the left and right sides, which has a high dynamic response frequency. The blind hole design in the middle makes the stress in the deformation zone more concentrated and the output signal larger.

[0050] To improve the sensor's resistance to roughness, the actual design range of the sensor is generally 5-10 times larger than the operating range, so the sensor has an extremely strong overload capacity.

[0051] Example 2

[0052] like Figure 5 As shown, this utility model provides a tensile and compressive force sensor specifically for electric vehicles. The difference between Embodiment 2 and Embodiment 1 is that:

[0053] In Example 1, the deformable part 12 is a cylindrical structure, while in Example 2, the deformable part 12 is a square structure.

[0054] Example 3

[0055] like Figure 6 As shown, this utility model provides a tension / compression sensor specifically for electric vehicles. The difference between Embodiment 3 and Embodiment 1 is that:

[0056] In Embodiment 1, both the deformable part 12 and the fixed part 13 are cylindrical structures, while in Embodiment 2, both the deformable part 12 and the fixed part 13 are square structures.

[0057] Example 4

[0058] like Figure 7 As shown, this utility model provides a tensile and compressive force sensor specifically for electric vehicles. The difference between Embodiment 4 and Embodiment 1 is that:

[0059] In Example 1, the transition step A14, the deformation part 12, the transition step B15, and the fixing part 13 are all cylindrical structures, while in Example 2, the transition step A14, the deformation part 12, the transition step B15, and the fixing part 13 are all square structures.

[0060] Example 5

[0061] like Figure 8 As shown, this utility model provides a tensile and compressive force sensor specifically for electric vehicles. The difference between Embodiment 5 and Embodiment 1 is that:

[0062] In Example 1, the deformable part 12 is a cylindrical structure, while in Example 5, the deformable part 12 is a cylindrical structure with two symmetrical flat sections cut at the front and back.

[0063] Example 6

[0064] like Figure 9 As shown, this utility model provides a tensile and compressive force sensor specifically for electric vehicles. The difference between Embodiment 6 and Embodiment 1 is that:

[0065] In Example 1, the transition step A14, the deformable part 12, and the transition step B15 are all cylindrical structures; while in Example 6, the deformable part 12 is a cylindrical structure, with two symmetrical flat sections cut at the front and back of the cylinder, and the transition steps A14 and B15 are both square structures, with the front and back of the square structure being flush with the front and back flat sections of the cylinder.

[0066] The above description provides examples of the preferred embodiments of this utility model. Any aspects not detailed herein are common knowledge to those skilled in the art. The scope of protection of this utility model is determined by the claims. Any equivalent modifications based on the technical teachings of this utility model are also within the scope of protection of this utility model.

Claims

1. A tension and compression force sensor for electric vehicles, comprising a metal elastic body (1), a sealing cover plate (2), a metal strain gauge (3), a locking nut (4), a signal output line (5) and a mating connector (6), characterized in that: The metal elastomer (1) includes a force-bearing part (11), a deformation part (12), and a fixing part (13) arranged in sequence. A transition step A (14) is provided between the force-bearing part (11) and the deformation part (12), and a transition step B (15) is provided between the deformation part (12) and the fixing part (13). An annular groove is provided around the transition step B (15). A deformation beam (123) is provided inside the deformation part (12), and two bridge wire holes (124) are symmetrically arranged on the deformation beam (123).

2. A tension and compression force sensor for electric vehicles as claimed in claim 1, wherein: The transition step A (14), the deformation part (12), the transition step B (15), and the fixing part (13) are all cylindrical structures.

3. The tension and compression force sensor for electric vehicles as claimed in claim 1, wherein: At least one of the four structures, namely, transition step A (14), deformation part (12), transition step B (15), and fixing part (13), is a square structure.

4. The tension and compression force sensor for electric vehicles as claimed in claim 1, wherein: The force-bearing part (11) includes an outer ring support (111), which is chamfered and has two U-shaped grooves (112) symmetrically distributed inward. The two U-shaped grooves (112) are connected.

5. The tension and compression force sensor for electric vehicles as claimed in claim 1, wherein: The deformable beam (123) has symmetrically distributed circuit board placement areas (122) on both sides, and the opening end of the circuit board placement area (122) is provided with a cover plate groove (121) for installing the sealing cover plate (2).

6. A tension and compression force sensor for electric vehicles as claimed in claim 5, wherein: The metal strain gauge (3) is symmetrically attached to the center of both sides of the deformation beam (123), and the wire grid area of ​​the metal strain gauge (3) is aligned with the center area.

7. The tension and compression force sensor for electric vehicles as claimed in claim 1, wherein: One of the bridge wire hole (124) has a wire outlet hole (126) and a fixing screw hole A (125) on its outside.

8. A tension and compression force sensor for electric vehicles as claimed in claim 7, wherein: One end of the locking nut (4) is installed in the fixing screw hole A (125), and the other end is connected in sequence to the signal output line (5) and the plug connector (6).

9. The tension and compression force sensor for electric vehicles as claimed in claim 1, wherein: The fixing part (13) extends downward and is provided with a support part (131) for connecting the buffer spring of the shared electric vehicle. Below the support part (131) there is an inwardly concave protruding fixing step (132).

10. The tension and compression force sensor for electric vehicles as claimed in claim 9, wherein: The center of the fixed step (132) has a fixing screw hole B (133) for fixing and connecting with the shock absorber (8).

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