A tension and pressure sensor with overload protection structure special for electric vehicle

Abstract

The utility model discloses a special take overload protection structure pull pressure sensor of electric motor car, including metal elastomer, sealing cover, metal strain meter, lock wire nut, signal output line and to the plug connector, metal elastomer includes the stress part, response part and fixed part that set gradually, between stress part and response part, response part and fixed part all are connected through the transition step of cylindrical structure, response part inside is equipped with the deformation beam of circular structure, and the upper and lower sides of deformation beam have the two split grooves of staggered arrangement, and the opposite outside of two split grooves all is equipped with overload protection slit. The utility model provides a pull pressure sensor, can pass through mechanical overload protection, prevents the sensor from failing due to overload, can also improve the measuring accuracy and the anti partial load capacity.

Description

Technical Field

[0001] This utility model relates to a tension and compression sensor with overload protection structure specifically for electric vehicles, and more specifically, it 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. Examples include a weighing sensor disclosed in CN202220920466.3 and a sensor mounting structure for an electric vehicle weighing device disclosed in CN202022652675.8.

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

[0005] Overload detection relying solely on electronic circuitry lacks a protective mechanism. When the load exceeds the sensor's range, the strain gauge is prone to plastic damage due to excessive deformation of the elastic body. Furthermore, there is significant room for improvement in the accuracy and resistance to off-center loads of existing tension and compression sensors.

[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 utility model addresses the shortcomings of the prior art by providing a tension / compression sensor for electric vehicles with an overload protection structure. It can prevent sensor failure due to overload through mechanical overload protection, and can also improve measurement accuracy and resistance to off-center loads.

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

[0009] A tension / compression sensor with overload protection structure 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-receiving part, a sensing part, and a fixing part arranged sequentially. The sensing part has a circular deformation beam inside, and the upper and lower sides of the deformation beam have two staggered dividing grooves. Both outer sides of the two dividing grooves have overload protection seams.

[0010] Furthermore, the force-bearing part and the sensing part, as well as the sensing part and the fixed part, are connected by transition steps with cylindrical structures.

[0011] 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.

[0012] Furthermore, the sensing element has a cylindrical or square structure.

[0013] Furthermore, the deformable beam has symmetrically distributed circuit board placement areas on both sides, and the open 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, the deformation beam is provided with two bridge-connecting holes for connecting the metal strain gauges on both sides. The bridge-connecting holes are symmetrically arranged on the left and right sides. One of the bridge-connecting holes is provided with an outlet hole, a fixing screw hole A and a groove on the outside in sequence.

[0016] Furthermore, one end of the locking nut is installed in the fixing screw hole A and the groove, 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. Below the support part is a fixing step that retracts inward and protrudes, and a fixing screw hole B is provided at the center of the fixing step.

[0018] Furthermore, the overload protection joint is a unidirectional tension-compression protection joint or a bidirectional tension-compression protection joint.

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

[0020] The metallic elastomer adopts an S-shaped shear beam structure, which improves the measurement accuracy of the sensor.

[0021] The design of overload protection slots and dividing grooves provides mechanical overload protection, preventing the sensor from failing due to overload, and the overload capacity can be increased by five times.

[0022] 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.

[0023] 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.

[0024] 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 helps to improve the accuracy of the sensor.

[0025] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0026] Figure 1 This is an exploded view of the structure of Example 1;

[0027] Figure 2 This is a schematic diagram of the structure of the metal elastomer in Example 1;

[0028] Figure 3 yes Figure 2 Schematic diagram of the cross section at point BB;

[0029] Figure 4 yes Figure 2 Side view of the middle structure;

[0030] Figure 5 yes Figure 4 A cross-sectional schematic diagram of CC;

[0031] Figure 6 This is a schematic diagram of the structure of the metal elastomer in Example 2;

[0032] Figure 7 This is a schematic diagram of the structure of the metal elastomer in Example 3;

[0033] Figure 8 This is a schematic diagram of the structure of the metal elastomer in Example 4.

[0034] In the diagram, 1-metal elastomer, 11-force-bearing part, 111-outer ring support, 112-U-shaped groove, 12-sensing part, 121-deformation beam, 122-circuit board placement area, 123-cover plate groove, 124-bridge wiring hole, 125-outlet hole, 126-fixing screw hole A, 127-sunken groove, 128-overload protection gap, 129-dividing groove, 13-fixing part, 131-supporting part, 132-fixing step, 133-fixing screw hole B; 2-sealing cover plate, 3-metal strain gauge, 4-locking nut, 5-signal output line, 6-connector. Detailed Implementation

[0035] 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.

[0036] Example 1

[0037] like Figures 1-5As shown in the figure, this utility model provides a tensile and compressive sensor with overload protection structure 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.

[0038] The metal elastomer 1 includes a force-receiving part 11, a sensing part 12, and a fixing part 13 arranged sequentially.

[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.

[0040] The sensing part 12 has a cylindrical structure. Inside the sensing part 12, there is a circular deformation beam 121. On both sides of the deformation beam 121, there are symmetrically distributed circuit board placement areas 122. The opening end of the circuit board placement area 122 is provided with a cover plate groove 123 for installing the sealing cover plate 2.

[0041] The metal strain gauge 3 is symmetrically attached to the center of both sides of the deformed beam 121, with the wire grid area of ​​the metal strain gauge 3 aligned with the center area.

[0042] The deformation beam 121 is provided with two bridge-connecting holes 124 for connecting the two metal strain gauges 3. The bridge-connecting holes 124 are symmetrically arranged on the left and right sides. One of the bridge-connecting holes 124 is provided with a wire outlet hole 125, a fixing screw hole A126 and a groove 127 in sequence on the outside.

[0043] One end of the locking nut 4 is installed in the fixing screw hole A126 and the groove 127, and the other end is connected in sequence to the signal output line 5 and the plug connector 6.

[0044] The deformable beam 121 has two staggered dividing grooves 129 on its upper and lower sides, and each of the two dividing grooves 129 has an overload protection joint 128 on its opposite outer side.

[0045] The fixing part 13 extends downward to provide a support part 131 for connecting the buffer spring of the shared electric vehicle. Below the support part 131 is a fixing step 132 that tapers inward. The fixing step 132 can position the top of the buffer spring to 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.

[0046] In this invention, the force-bearing part 11 and the sensing part 12, as well as the sensing part 12 and the fixing part 13, can be connected by a cylindrical transition step. The cylindrical transition step can increase the deformation of the intermediate deformation beam 121 and improve the sensor's resistance to off-center loads.

[0047] Working principle:

[0048] 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.

[0049] Example 2

[0050] like Figure 6 As shown, this utility model provides a tensile and compressive sensor with overload protection structure specifically for electric vehicles. The difference between Embodiment 2 and Embodiment 1 is as follows:

[0051] In Example 1, overload protection seams 128 are provided on the opposite outer sides of the two dividing grooves 129, while in Example 2, there are no overload protection seams 128 on the opposite outer sides of the two dividing grooves 129.

[0052] Example 3

[0053] like Figure 7 As shown, this utility model provides a tensile and compressive sensor with overload protection structure specifically for electric vehicles. The difference between Embodiment 3 and Embodiment 1 is as follows:

[0054] The sensing part 12 in Embodiment 1 has a cylindrical structure, while the sensing part 12 in Embodiment 3 has a square structure.

[0055] In Example 1, overload protection seams 128 are provided on the opposite outer sides of the two dividing grooves 129, while in Example 3, there are no overload protection seams 128 on the opposite outer sides of the two dividing grooves 129.

[0056] like Figure 8 As shown, this utility model provides a tensile and compressive sensor with overload protection structure specifically for electric vehicles. The difference between Embodiment 4 and Embodiment 1 is as follows:

[0057] The sensing part 12 in Embodiment 1 has a cylindrical structure, while the sensing part 12 in Embodiment 4 has a square structure.

[0058] In Example 1, the overload protection joint 128 is a unidirectional tension-compression protection joint, while in Example 4, the overload protection joint 128 is a bidirectional tension-compression protection joint.

[0059] 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 / compression sensor for electric vehicles with overload protection structure, comprising a metal elastomer (1), a sealing cover (2), a metal strain gauge (3), a locking nut (4), a signal output line (5), and a connector (6), characterized in that: The metal elastomer (1) includes a force-receiving part (11), a sensing part (12), and a fixing part (13) arranged in sequence; the sensing part (12) has a circular deformation beam (121) inside, and the upper and lower sides of the deformation beam (121) have two staggered dividing grooves (129), and the two dividing grooves (129) are provided with overload protection seams (128) on opposite outer sides.

2. The electric vehicle-specific tensile / compressive sensor with overload protection structure as described in claim 1, characterized in that: The force-receiving part (11) and the sensing part (12), as well as the sensing part (12) and the fixed part (13), are connected by a transition step with a cylindrical structure.

3. The electric vehicle-specific tensile / compression sensor with overload protection structure as described in claim 1, characterized in that: 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.

4. The electric vehicle-specific tensile / compression sensor with overload protection structure as described in claim 1, characterized in that: The sensing part (12) has a cylindrical or square structure.

5. The electric vehicle-specific tensile / compressive sensor with overload protection structure as described in claim 1, characterized in that: The deformable beam (121) has symmetrically distributed circuit board placement areas (122) on both sides, and the open end of the circuit board placement area (122) is provided with a cover plate groove (123) for installing the sealing cover plate (2).

6. A tension / compression sensor for electric vehicles with overload protection structure as described in claim 5, characterized in that: The metal strain gauge (3) is symmetrically attached to the center of both sides of the deformation beam (121), and the wire grid area of ​​the metal strain gauge (3) is aligned with the center area.

7. The electric vehicle-specific tensile / compression sensor with overload protection structure as described in claim 1, characterized in that: The deformation beam (121) is provided with two bridge-connecting holes (124) for connecting the two metal strain gauges (3). The bridge-connecting holes (124) are symmetrically arranged on the left and right. One of the bridge-connecting holes (124) is provided with a wire outlet hole (125), a fixing screw hole A (126) and a groove (127) in sequence on the outside.

8. A tension / compression sensor for electric vehicles with overload protection structure as described in claim 7, characterized in that: One end of the locking nut (4) is installed in the fixing screw hole A (126) and the groove (127), and the other end is connected in sequence to the signal output line (5) and the plug connector (6).

9. A tension / compression sensor for electric vehicles with overload protection structure as described in claim 1, characterized in that: 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), and a fixing screw hole B (133) is provided at the center of the fixing step (132).

10. A tension / compression sensor for electric vehicles with overload protection structure as described in claim 1, characterized in that: The overload protection joint (128) is a unidirectional tension-compression protection joint or a bidirectional tension-compression protection joint.

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