Force sensing element for a force sensor and force sensor
Patent Information
- Application Number
- CN202522707758.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-19
- Publication Date
- 2026-10-27
- Estimated Expiration
- 2035-12-19
AI Technical Summary
这些非测量方向的应力（以下简称“安装应力”）会引发弹性体产生额外的、非期望的形变，从而导致传感器出现零点漂移和灵敏度变化，降低测量精度和可靠性
本申请通过在弹性体的表面凸设安装部，安装部与弹性体的中间部相间隔，使得安装应力集中在安装部，从空间结构上阻断了安装应力向中间部传递的路径，隔离安装应力有利于提升测力传感器的测量精确性和长期可靠性。
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Figure CN224906162U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of force sensor technology, and in particular to a force-sensitive element and a force sensor. Background Technology
[0002] A force sensor is a device that converts changes in weight into a measurable electrical signal. Force sensors are widely used in industry, research, and science to measure and monitor various types of forces, such as pressure, tension, and torque. In practical engineering applications, sensors need to be mounted on mechanical equipment using fasteners such as bolts. The preload generated during installation, as well as additional stresses caused by thermal expansion and vibration during equipment operation, are transmitted to the elastic body. These stresses in the non-measuring direction (hereinafter referred to as "installation stress") can induce additional, undesirable deformation in the elastic body, leading to zero-point drift and sensitivity changes in the sensor, thus reducing measurement accuracy and reliability. Utility Model Content
[0003] To address the aforementioned technical problems, embodiments of this application provide a force-sensitive element for a force sensor. The force-sensitive element includes an elastic body and a mounting portion. The elastic body is used to mount a strain gauge; the mounting portion protrudes from the surface of the elastic body and is used to connect to an external structure. The elastomer includes a first part, a second part, and an intermediate part connecting the first part and the second part; each of the first part and the second part has at least one mounting part protruding from its surface, and each mounting part is spaced apart from the intermediate part, the intermediate part being used to mount a strain gauge.
[0004] In some embodiments, an isolation groove is provided between the first part and the second part and each mounting part.
[0005] In some embodiments, two isolation grooves are provided between the first part and the second part and each mounting part, and the two isolation grooves are symmetrically arranged along the width direction of the elastomer.
[0006] In some embodiments, the number of mounting parts is multiple, and the multiple mounting parts include a first mounting part, a second mounting part, a third mounting part, and a fourth mounting part; The first part is provided with a first mounting part and a second mounting part, which are respectively provided on opposite sides of the first part along the width direction of the elastic body; The second part is provided with a third mounting part and a fourth mounting part, which are respectively provided on opposite sides of the second part along the width direction.
[0007] In some embodiments, along the height direction of the elastomer, the projection of the first mounting portion covers the third mounting portion, and the projection of the second mounting portion covers the fourth mounting portion.
[0008] In some embodiments, both the first part and the second part are provided with four mounting parts, and the four mounting parts are arranged orthogonally around the first part and the second part in the circumferential direction.
[0009] In some embodiments, the mounting portion is provided with a through hole extending along the thickness direction of the elastomer.
[0010] In some embodiments, the first part, the second part, and the middle part are all cylindrical structures, and the outer diameter of the middle part is smaller than the outer diameter of the first part and the second part.
[0011] In some embodiments, the elastomer is provided with a channel extending along the height direction of the elastomer, the channel passing through the first part, the middle part and the second part; the middle part is provided with a plurality of openings along the circumferential direction, the openings communicating with the channel.
[0012] In some embodiments, the mounting portion is an elastic structure and is integrally formed with the elastomer.
[0013] To address the aforementioned technical problems, embodiments of this application also provide a force sensor, which includes a strain gauge and the force-sensitive element provided in the above embodiments, with the strain gauge mounted on the elastic body of the force-sensitive element.
[0014] The beneficial effects of the force-sensitive element of the force sensor provided in this application are: This application provides a mounting portion protruding from the surface of an elastomer, with the mounting portion spaced apart from the middle portion of the elastomer. This concentrates the mounting stress in the mounting portion, thus blocking the path of the mounting stress from being transmitted to the middle portion from a spatial structural perspective. Isolating the mounting stress helps improve the measurement accuracy and long-term reliability of the force sensor. Attached Figure Description
[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are merely some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.
[0016] Figure 1 This is a three-dimensional structural schematic diagram of the force-sensitive element provided in some embodiments of this application; Figure 2 yes Figure 1 A top-view planar structural diagram of the force-sensitive element in the embodiment; Figure 3 yes Figure 1 A three-dimensional structural schematic diagram of the force-sensitive element in the embodiment from another perspective; Figure 4 This is a top plan view of the force-sensitive element provided in some embodiments of this application; Figure 5 This is a schematic diagram of the structure of a force sensor provided in some embodiments of this application.
[0017] The accompanying diagrams are labeled as follows: 1 Force sensor, 10 Force-sensitive element, 20 Strain gauge, 100 Elastomer, 101 First part, 102 Second part, 103 Middle part, 104 Channel, 105 Opening, 200 Mounting part, 201 First mounting part, 202 Second mounting part, 203 Third mounting part, 204 Fourth mounting part, 205 Through hole, 300 Isolation groove. Detailed Implementation
[0018] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.
[0019] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.
[0020] This application provides a force-sensitive element for a force sensor. Please refer to [link to relevant documentation]. Figure 1 , Figure 1 This is a three-dimensional structural schematic diagram of a force-sensitive element provided in some embodiments of this application.
[0021] In some embodiments, the force-sensitive element 10 includes an elastic body 100 and a mounting portion 200. The elastic body 100 is used to mount a strain gauge; the mounting portion 200 protrudes from the surface of the elastic body 100 and is used to connect to an external structure. It is understood that the core function of the force-sensitive element 10 is to convert force signals into more intuitive electrical signals. The force-sensitive element 10 includes the elastic body 100 as a physical load-bearing body and deformation source, and the strain gauge as a sensing and conversion unit. During the use of the force sensor, when the measured external force acts on the elastic body 100, the elastic body 100 undergoes elastic deformation proportional to the external force. This elastic deformation can be transmitted to the strain gauge attached to or integrated onto the surface of the elastic body 100. The strain gauge, based on the strain resistance effect, can convert deformation into a change in resistance value, and the change in resistance value can be converted into a change in voltage or current signal, thereby achieving accurate electrical measurement of the deformation.
[0022] Common materials for the elastomer 100 include, but are not limited to, aluminum alloys, alloy steels, stainless steels, and titanium alloys. Its selection is primarily based on the required elastic modulus, strength, fatigue life, and compatibility with the working environment. As long as it can produce recoverable and measurable elastic deformation under external force, it is acceptable; this application does not impose specific limitations on this. The type of strain gauge may include metal foil strain gauges, semiconductor strain gauges, or thin-film strain gauges, and its selection depends on sensitivity, temperature characteristics, and cost. External structure generally refers to the object or mounting base to which the force sensor needs to be connected and measured, such as the frame, platform, load-bearing beam, or drive shaft of industrial equipment. The basic structure of the force-sensitive element 10 and its connection relationship with the external structure described above are all common knowledge and general technical means in this field, and will not be elaborated upon here.
[0023] The elastomer 100 includes a first part 101, a second part 102, and an intermediate part 103 connecting the first part 101 and the second part 102. The first part 101 and the second part 102 are located at opposite ends of the elastomer 100 and primarily serve as structural connections. The intermediate part 103 connects the first part 101 and the second part 102 and is used to mount strain gauges. At least one mounting portion 200 is protruding from the surfaces of both the first part 101 and the second part 102. The mounting portion 200 can be, for example, a block-shaped, columnar, or ear-shaped protrusion and can be connected to an external structure via fasteners such as bolts. Each mounting portion 200 is spaced apart from the intermediate part 103, so that the installation stress is mainly concentrated in the mounting portion 200, and most of the installation stress is consumed, dispersed, or balanced in this area. Even if a small portion of the installation stress is transmitted to the main body area of the elastomer 100, it will be consumed, dispersed, or balanced in the area of the first part 101 and the second part 102. This structural design effectively isolates the installation stress from interfering with the middle part 103, improves the overall stress distribution, and thus suppresses the resulting zero-point drift and sensitivity changes, thereby improving the measurement accuracy and long-term reliability of the force sensor.
[0024] It should be understood that the terms "comprising" and "having," and any variations thereof, used in this application and the appended claims, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus.
[0025] Please see Figure 2 , Figure 2 yes Figure 1 A top-view planar structural diagram of the force-sensitive element in the embodiment.
[0026] In some embodiments, an isolation groove 300 is provided between the first part 101 and the second part 102 and each mounting part 200. When installation stress is transmitted from the mounting part 200 to the first part 101 and the second part 102, the stress will concentrate at the isolation groove 300 because the cross-section of the isolation groove 300 area suddenly decreases. Under the action of concentrated stress, the inner wall of the isolation groove 300 will undergo controllable and slight elastic deformation. This deformation process requires energy, so the installation stress attempting to continue to be transmitted to the first part 101 and the second part 102 through the isolation groove 300 will be converted into elastic deformation of the groove wall. This structural design actively guides and captures the installation stress that might otherwise spread in the area of the isolation groove 300, blocking the further spread of installation stress, effectively absorbing and dissipating the installation stress attempting to be transmitted to the first part 101 and the second part 102, and enhancing the isolation effect.
[0027] In other embodiments, the connection area between the first part 101 and the second part 102 and the mounting part 200 may not be machined to form an isolation groove 300. Instead, the concentration and dissipation of installation stress are achieved through differentiated material properties. Specifically, a stress-buffered interface layer made of a special functional material can be provided in the connection area between the first part 101 and the second part 102 and the mounting part 200. This special functional material can be an annealed metal or an inlaid high-damping alloy to reduce the hardness and elastic modulus of the connection area. When installation stress is transmitted from the mounting part 200 to the first part 101 and the second part 102, according to mechanical principles, the installation stress will naturally flow to and concentrate in this relatively flexible stress-buffered interface layer, thus achieving stress dissipation. In this embodiment, stress concentration no longer depends on abrupt changes in geometry, but is actively guided by changes in material properties, thereby achieving the purpose of blocking the transmission of installation stress to the first part 101 and the second part 102. This method, while achieving stress isolation, also has the advantage of a continuous and uninterrupted appearance at the connection.
[0028] In some embodiments, two isolation grooves 300 are provided between the first part 101 and the second part 102 and each mounting part 200, and the two isolation grooves 300 are symmetrically arranged along the width direction of the elastic body 100. The two isolation grooves 300 are positioned on either side of the centerline of the width direction of the elastic body 100 as the axis of symmetry, and their shape, size, and distance from the axis of symmetry are substantially the same. The symmetrically arranged isolation grooves 300 can effectively avoid additional bending moments or torsional loads caused by asymmetrical deformation; the combined effect of the two isolation grooves 300 can also provide a larger overall deformation capacity and energy absorption capacity than a single isolation groove 300, enabling more efficient absorption and dissipation of stress.
[0029] In other embodiments, the number and layout of the isolation grooves 300 can be adaptively adjusted according to different performance requirements and application scenarios. For example, when the stress isolation performance requirements are relatively relaxed, only one isolation groove 300 can be set for each connection area. A single isolation groove 300 can absorb and block most of the installation stress through effective deformation, achieving a basic and reliable isolation effect. When the stress isolation performance requirements are high, two or more isolation grooves 300 can be set for each connection area. These isolation grooves 300 can be symmetrical about the centerline in the width direction of the elastic body 100 to provide balanced and stable stress dissipation; alternatively, they can be arranged in an alternating manner on both sides of the centerline. The alternating arrangement can create a longer and more circuitous stress transmission path and more deformation points, thereby achieving a good stress isolation effect in a limited space. It should be noted that the number (one, two or more) of isolation grooves 300 and their specific arrangement (symmetrical or alternating) listed above are only exemplary implementation methods. The core concept of this application is to introduce one or more isolation groove structures 300 capable of controlled deformation along the mechanical connection path between the mounting section 200 and the first part 101 and the second part 102, so as to actively absorb and block the transmission of installation stress. Therefore, all design variations that set groove-shaped structures in the connection area to achieve stress isolation should fall within the protection scope of this application.
[0030] In some embodiments, the cross-section of the isolation groove 300 can be designed as rectangular, with the groove wall and bottom forming a right angle. The main advantage of this shape is its ease of machining; it can be formed in one step using a standard flat-end mill, resulting in low manufacturing costs. The rectangular isolation groove 300 provides a well-defined groove structure with a large deformation space, effectively interrupting the continuity of stress and thus blocking and interfering with stress transmission. Furthermore, the shape of the isolation groove 300 can be varied and not limited to rectangular, including but not limited to: isolation grooves 300 with acute angles between the groove wall and bottom, semi-circular isolation grooves 300, and stepped isolation grooves 300. The specific shape of the isolation groove 300 can be adjusted according to the product's requirements for fatigue performance, stress distribution, and specific stiffness, which will not be elaborated upon here.
[0031] Please see Figure 3 , Figure 3 yes Figure 1 A three-dimensional structural schematic diagram of the force-sensitive element in the embodiment from another perspective.
[0032] In some embodiments, there are multiple mounting portions 200, including a first mounting portion 201, a second mounting portion 202, a third mounting portion 203, and a fourth mounting portion 204. A first portion 101 is provided with a first mounting portion 201 and a second mounting portion 202, which are respectively disposed on opposite sides of the first portion 101 along the width direction of the elastic body 100. The first mounting portion 201 and the second mounting portion 202 are not only disposed on opposite sides of the first portion 101 along the width direction of the elastic body 100, but can also be symmetrically disposed along the centerline of the thickness direction of the elastic body 100. This symmetrical arrangement allows the installation stress on both sides of the elastic body 100 to achieve mechanical balance, better offsetting the additional bending moment generated by installation. Alternatively, the first mounting portion 201 and the second mounting portion 202 can be disposed only on opposite sides of the first portion 101 along the width direction of the elastic body 100, without emphasizing their symmetry about the centerline of the thickness direction. This arrangement provides design flexibility and spatial adaptability. For example, it can better adapt to asymmetrical installation spaces, or avoid interference from other auxiliary structures (such as cable trays or positioning pins).
[0033] The second part 102 is provided with a third mounting part 203 and a fourth mounting part 204, which are respectively provided on opposite sides of the second part 102 along the width direction. Accordingly, the second part 102 can adopt the same or corresponding layout concept as the first part 101, and the third mounting part 203 and the fourth mounting part 204 can be arranged symmetrically or asymmetrically to improve the overall force coordination and consistency of the force sensor.
[0034] In some embodiments, along the height direction of the elastomer 100, the projection of the first mounting portion 201 covers the third mounting portion 203, and the projection of the second mounting portion 202 covers the fourth mounting portion 204. When the mounting portions 200 on both sides of the first portion 101 and the second portion 102 are aligned in the height direction of the elastomer 100, the mounting stress of the first mounting portion 201 and the third mounting portion 203 on the left side of the elastomer 100 is forcibly constrained within a narrow channel where the first mounting portion 201 and the third mounting portion 203 are collinear; the mounting stress of the second mounting portion 202 and the fourth mounting portion 204 on the right side of the elastomer 100 is also forcibly constrained within a narrow channel where the second mounting portion 202 and the fourth mounting portion 204 are collinear. This allows the mounting stress to be efficiently concentrated in the collinear regions of the first mounting portion 201 and the third mounting portion 203 and the second mounting portion 202 and the fourth mounting portion 204, effectively suppressing the circumferential diffusion of the mounting stress to the first portion 101 and the second portion 102.
[0035] Understandably, all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.
[0036] Please see Figure 4 , Figure 4 This is a top planar structural schematic diagram of a force-sensitive element provided in some embodiments of this application.
[0037] In some embodiments, both the first portion 101 and the second portion 102 are provided with four mounting portions 200, which are arranged orthogonally around the first portion 101 and the second portion 102 in the circumferential direction. Viewed from the upper and lower end faces of the elastic body 100, the four mounting portions 200 are arranged in a cross shape. The four orthogonally distributed mounting portions 200 can form an effective couple in any horizontal direction, thereby resisting bending moments, torques and lateral force interference from various directions and maintaining the isotropic stiffness of the mounting interface.
[0038] In other embodiments, the number of mounting portions 200 provided on the first portion 101 and the second portion 102 is not limited to the aforementioned two or four, but can be flexibly designed according to specific load-bearing requirements, space constraints, or cost considerations. For example, three mounting portions 200 can be provided and evenly distributed around the circumference, forming a 120° angle with each other, thereby constituting a stable triangular support structure. For applications requiring extreme heavy loads or special requirements for interface pressure distribution, six, eight, or even more mounting portions 200 can be arranged circumferentially. It should be noted that the specific number of mounting portions 200 mentioned herein (such as two, three, four, six, etc.) is merely an illustrative example to aid understanding and is not a limitation on the scope of protection of this application.
[0039] Please continue reading. Figure 1 , Figure 1 This is a three-dimensional structural schematic diagram of a force-sensitive element provided in some embodiments of this application.
[0040] In some embodiments, the mounting portion 200 is provided with a through hole 205 extending along the thickness direction of the elastomer 100. The through hole 205 allows fasteners such as bolts and pins to pass through, enabling a reliable connection between the force sensor and the external structure. The inner wall of the through hole 205 can directly contact the fasteners, allowing for a more intuitive definition of the specific location and method of inputting the installation load into the mounting portion 200, providing a clear and controllable starting point for subsequent stress analysis and isolation design. Furthermore, by designing the size and position of the through hole 205, a more ideal pressure distribution of the bolt preload can be guided within the mounting portion 200, reducing localized extrusion deformation or stress concentration and protecting the structural integrity of the mounting portion 200. In addition, the through hole 205 can also function as a positioning pin hole, ensuring accurate orientation and preventing undesirable circumferential rotation of the force sensor during installation, improving the accuracy and efficiency of system assembly.
[0041] In other embodiments, the mounting portion 200 may not have a through hole 205, but instead connect to the external structure using other methods such as external threads, snap-fit, welding, or bonding. For example, external threads can be directly machined onto the outer peripheral surface of the mounting portion 200, and during installation, it can be fixed by screwing it into a mounting base with internal threads or a matching nut. Alternatively, elastic claws, barbs, or flanges can be designed on the mounting portion 200, and matching grooves or openings can be designed on the corresponding mounting base. During installation, pressing or rotating utilizes the elastic deformation of the material to quickly engage and lock the snap-fit structure. Furthermore, the outer peripheral surface of the mounting portion 200 can be welded or bonded to the mounting base to achieve a permanent connection.
[0042] In some embodiments, the first portion 101, the second portion 102, and the intermediate portion 103 are all cylindrical structures, with the outer diameter of the intermediate portion 103 being smaller than the outer diameters of the first portion 101 and the second portion 102. It is understood that the axial strain of a cylinder is inversely proportional to its cross-sectional area. Since the outer diameter of the intermediate portion 103 is smaller than that of the first portion 101 and the second portion 102, the cross-sectional area of the intermediate portion 103 is also smaller than that of the first portion 101 and the second portion 102. Therefore, when the same axial force passes sequentially through the first portion 101, the intermediate portion 103, and the second portion 102, a greater degree of stress and strain concentration will occur in the intermediate portion 103. This makes the intermediate portion 103 naturally the most stress-sensitive area in the entire elastic body 100, exhibiting the most significant deformation. Simultaneously, a strain gauge is installed in the intermediate portion 103. The strain gauge can directly sense the elastic deformation of the intermediate portion 103 and convert the elastic deformation into a change in resistance, which is then converted into a voltage or current signal output through an external measuring circuit (such as a Wheatstone bridge). Furthermore, the cylindrical structure is easy to machine with high precision, which helps to ensure dimensional accuracy and symmetry. The cylindrical cross-section also makes the strain distribution on the surface of the middle part 103 more uniform and predictable when subjected to axial tensile or compressive forces. This provides ideal conditions for the bonding of strain gauges and signal processing, and helps to improve the linearity and accuracy of measurements.
[0043] In some embodiments, the elastomer 100 is provided with a channel 104 extending along the height direction of the elastomer 100, the channel 104 penetrating the first part 101, the middle part 103, and the second part 102; the middle part 103 is provided with a plurality of openings 105 along the circumferential direction, the openings 105 communicating with the channel 104. To achieve higher precision measurement of minute force values, i.e., to meet the requirements of smaller range and higher sensitivity, this embodiment further optimizes the structural lightweighting and stiffness design of the elastomer 100. Specifically, the elastomer 100 is provided with a through channel 104 extending along the height direction, the channel 104 sequentially penetrating the first part 101, the middle part 103, and the second part 102. Furthermore, a plurality of openings 105 are provided circumferentially on the sidewall of the middle part 103, these openings 105 communicating with the central channel 104, together forming an internally hollow cavity structure.
[0044] Channel 104 and circumferential openings 105 remove a significant amount of material from the elastomer 100, reducing the effective cross-sectional area of the elastomer 100. According to mechanical principles, this significantly reduces the structural stiffness of the intermediate portion 103 under force. When the elastomer 100 is subjected to the same small external force, the hollowed-out structure of the elastomer 100 can produce a much larger elastic deformation than the solid structure. This strain amplification effect allows the strain gauge attached to the intermediate portion 103 to output a stronger electrical signal, thereby improving the sensitivity of the force sensor and enabling it to accurately distinguish and measure smaller force changes. Simultaneously, the circumferentially uniformly distributed openings 105 ensure the symmetry of the stiffness of the intermediate portion 103 in the circumferential direction, avoiding bending coupling caused by asymmetry. In addition, this hollow design cleverly solves the processing difficulties in the traditional design of ultra-small range sensors: it allows the outer contour wall thickness of the middle part 103 to be kept within a reasonable range that is easy to machine, while achieving ultra-low stiffness through internal hollowing, thus taking into account high precision, high sensitivity, and excellent process feasibility and structural reliability.
[0045] In some embodiments, the mounting portion 200 is an elastic structure and is integrally formed with the elastomer 100. Specifically, the mounting portion 200 and the elastomer 100 are manufactured in one piece through an integral processing technology, forming a whole without any mechanical connection interface. This can effectively eliminate the interface stress concentration and assembly accumulation errors that are inevitably caused by split structures (such as welding, screwing, or press fitting). Because all mechanical behaviors on the elastomer 100 are based on a uniform and continuous material foundation, without any uncontrollable interface variables, the mechanical performance and measurement accuracy of the force sensor are well balanced and unified, providing a physical basis for achieving highly stable measurements.
[0046] Understandably, to realize the basic sensing, signal processing, and output functions of a force sensor, a complete sensor product typically also includes other standard components commonly used in the field. For example, a sensor also includes wires and cables for connecting strain gauges and forming a circuit system, signal processing circuit boards for signal amplification, zeroing, and analog-to-digital conversion, etc. The functions, configurations, and interconnection methods of these components are all common knowledge and mature technologies in the field of force sensor technology, and will not be elaborated upon here.
[0047] This application also provides a force sensor. Please refer to [link / reference]. Figure 5 , Figure 5 This is a schematic diagram of the structure of a force sensor provided in some embodiments of this application.
[0048] In some embodiments, the force sensor 1 includes a strain gauge 20 and a force-sensitive element 10 as described in the above embodiments. The strain gauge 20 is mounted on the elastic body 100 of the force-sensitive element 10. The strain gauge 20 can be mounted at a preset position on the elastic body 100 of the force-sensitive element 10 by processes such as bonding, welding, or thin film deposition. The force-sensitive element 10 effectively blocks the installation stress by providing a mounting portion 200, so that the force transmitted to the middle portion 103 region is mainly the target load to be measured. The strain gauge 20 can further convert the force signal into an electrical signal, enabling the force sensor 1 to perform accurate electrical measurements of deformation, thereby improving the measurement accuracy and long-term reliability of the force sensor 1.
[0049] It should be understood that the terminology used in this specification and appended claims is for the purpose of describing particular embodiments only and is not intended to limit the application. As used in this specification and appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise. Similarly, the terms “first” and “second” in the description of this application are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as “first” or “second” may explicitly or implicitly include one or more of the stated features. Furthermore, the term “multiple” in the description of this application means two or more, unless otherwise explicitly specified.
[0050] In the description of this application, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0051] The above description is only a partial embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural changes made based on the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.
Claims
1. A force-sensitive element of a force sensor, characterized in that, The force-sensitive element includes an elastic body and a mounting portion. The elastic body is used to mount a strain gauge. The mounting portion protrudes from the surface of the elastic body and is used to connect to an external structure. The elastic body includes a first part, a second part, and an intermediate part connecting the first part and the second part; at least one mounting part is provided on the surface of both the first part and the second part, and each mounting part is spaced apart from the intermediate part, the intermediate part being used to mount the strain gauge.
2. The force-sensitive element according to claim 1, characterized in that, An isolation groove is provided between the first part and the second part and each of the mounting parts.
3. The force-sensitive element according to claim 2, characterized in that, Two isolation grooves are provided between the first part and the second part and each of the mounting parts, and the two isolation grooves are symmetrically arranged along the width direction of the elastic body.
4. The force-sensitive element according to claim 1, characterized in that, The number of mounting parts is multiple, and the multiple mounting parts include a first mounting part, a second mounting part, a third mounting part, and a fourth mounting part; The first part is provided with a first mounting part and a second mounting part, and the first mounting part and the second mounting part are respectively provided on opposite sides of the first part along the width direction of the elastic body; The second part is provided with the third mounting part and the fourth mounting part, which are respectively provided on opposite sides of the second part along the width direction.
5. The force-sensitive element according to claim 4, characterized in that, Along the height direction of the elastomer, the projection of the first mounting portion covers the third mounting portion, and the projection of the second mounting portion covers the fourth mounting portion.
6. The force-sensitive element according to claim 1, characterized in that, Both the first part and the second part are provided with four mounting parts, and the four mounting parts are arranged orthogonally around the first part and the second part in the circumferential direction.
7. The force-sensitive element according to claim 1, characterized in that, The mounting portion is provided with a through hole extending along the thickness direction of the elastomer.
8. The force-sensitive element according to claim 1, characterized in that, The first part, the second part, and the middle part are all cylindrical structures, and the outer diameter of the middle part is smaller than the outer diameter of the first part and the second part.
9. The force-sensitive element according to claim 8, characterized in that, The elastomer is provided with a channel extending along the height direction of the elastomer, the channel passing through the first part, the middle part and the second part; the middle part is provided with a plurality of openings along the circumferential direction, the openings communicating with the channel.
10. The force-sensitive element according to any one of claims 1-9, characterized in that, The mounting part is an elastic structure and is integrally formed with the elastomer.
11. A force sensor, characterized in that, The force sensor includes a strain gauge and a force-sensitive element as described in any one of claims 1-10, wherein the strain gauge is mounted on the elastic body of the force-sensitive element.