Sensor component
Through the combination of two-color molding technology and O-ring, the shape of the sensor components is simplified and fluid infiltration is suppressed, solving the problems of complex structure and fluid infiltration in traditional sensor components, and achieving a more stable sensor design.
Patent Information
- Application Number
- CN202410708564.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2023-06-29
- Filing Date
- 2024-06-03
- Publication Date
- 2024-12-31
AI Technical Summary
When traditional sensor components prevent fluid from entering, the shape of the primary molded part is complex and the amount of resin increases, resulting in complex structure.
The sensor body is manufactured using a two-color molding technology, and by setting a tiny gap between the primary molding part and the secondary molding part, and contacting the inner surface of the mounting hole with an O-ring, the shape is simplified and fluid infiltration is suppressed.
It realizes simplified shape and effectively suppresses fluid infiltration, reduces the use of resin, while avoiding heat transfer, and improves the structural stability and adaptability of the sensor.
Smart Images
Figure CN119223462A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a sensor component. Background Art
[0002] Conventionally, a sensor component for measuring the temperature of a device housing as a measurement target is known (for example, see patent document 1). The sensor component described in patent document 1 is assembled into a mounting hole provided in a device housing to measure the temperature of the measurement target. The sensor component includes a temperature measuring unit, a rod-shaped primary molded portion, a secondary molded portion covering the primary molded portion, and a metal cap bent and crimped to the end of the primary molded portion, wherein a portion of the temperature measuring unit is embedded in the primary molded portion. The temperature measuring unit includes a pair of leads and a temperature detection element electrically connected between the pair of leads and detecting the temperature of the measurement target. The temperature detection element is arranged to be exposed from the end of the primary molded portion, covered by a metal cap, and configured to sense the temperature of the fluid, i.e., the measurement target.
[0003] Prior art
[0004] Patent Literature
[0005] Patent document 1: EP2485023 (A2) Summary of the invention
[0006] Problems to be solved by the present invention
[0007] However, the sensor component described in Patent Document 1 is provided with protrusions and fine recesses on the outer surface of the primary molded part covered by the secondary molded part to prevent the fluid from entering between the primary molded part and the secondary molded part (i.e., inside), and therefore, the shape of the primary molded part often becomes complicated and the amount of resin in the primary molded part often increases.
[0008] An object of an embodiment is to provide a sensor component having a simplified shape to suppress penetration of a fluid into the sensor component.
[0009] Solutions to the problem
[0010] In order to solve the above problems and achieve the above objectives, the invention according to the first aspect is a sensor component to be press-fitted into a mounting hole provided in a housing to detect a physical quantity of a measurement target, the sensor component comprising: a rod-shaped sensor body to be press-fitted into the mounting hole; a detection device, the detection device being arranged on the press-fitting direction side of the mounting hole of the sensor body, the detection device being configured to detect the physical quantity of the measurement target; and a pair of O-rings, the pair of O-rings being arranged on the sensor body and being capable of making close contact with the inner surface of the mounting hole, wherein the sensor body is formed by two-component molding. molding), wherein the sensor body comprises: a primary molding portion, which is formed by primary molding and in which the detection device is embedded; a secondary molding portion, which is formed by secondary molding and is arranged on the opposite side of the press-fitting direction of the mounting hole of the primary molding portion; and a boundary portion, which is located between the primary molding portion and the secondary molding portion, wherein the primary molding portion comprises a first arrangement portion, on which one of the pair of O-rings is arranged, and the secondary molding portion comprises a second arrangement portion, on which the other of the pair of O-rings is arranged, and the second arrangement portion, the boundary portion, and the first arrangement portion are arranged in sequence in the press-fitting direction.
[0011] Beneficial effects of the present invention
[0012] According to the first aspect of the invention, the shape can be simplified and the infiltration of the fluid into the interior can be suppressed. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 is a perspective view showing a sensor component according to an embodiment of the present invention.
[0014] Figure 2 yes Figure 1 A vertical cross-section of the sensor components shown.
[0015] Figure 3 is a cross-sectional view showing a sensor component press-fitted into a mounting hole of a housing.
[0016] Reference Mark List
[0017] 1 Sensor components
[0018] 2 Sensor body
[0019] 31 Detection element (detection device)
[0020] 4First O-ring (one of a pair of O-rings)
[0021] 5 Second O-ring (the other of a pair of O-rings)
[0022] 6. Primary molding unit
[0023] 63 First Arrangement Department
[0024] 7 Secondary molding department
[0025] 74 Second Arrangement Department
[0026] 8 Boundary Department
[0027] 81 first upper surface (interface)
[0028] 83 second lower surface (interface)
[0029] S Gap
[0030] 10 Housing
[0031] 10a Mounting hole
[0032] WCooling water (measurement target) DETAILED DESCRIPTION
[0033] The following will refer to Figures 1 to 3 Embodiments of the present invention are described. Figure 1 is a perspective view of a sensor component 1 according to an embodiment of the present invention. Figure 2 yes Figure 1 A vertical cross-section of the sensor component 1 is shown. Figure 3 is a cross-sectional view showing the sensor component 1 press-fitted into the mounting hole 10 a of the housing 10 .
[0034] like Figure 1 and Figure 3 As shown, the sensor component 1 according to the present embodiment is press-fitted into the mounting hole 10a provided in the housing 10 (as shown in FIG. Figure 3 As shown), and is used to measure the cooling water W (measurement target, such as Figure 3 Temperature (physical quantity) as shown.
[0035] like Figure 1 , Figure 2 As shown, the sensor component 1 includes a sensor body 2 which is press-fitted into the mounting hole 10a, a detection element 31 (detection device, such as Figure 2 The temperature measuring unit 3 (as shown) Figure 2 ), and a pair of O-rings 4, 5 provided on the sensor body 2. Hereinafter, one of the pair of O-rings 4, 5 may be referred to as a "first O-ring 4", and the other may be referred to as a "second O-ring 5".
[0036] Hereinafter, the direction in which the mounting hole 10a of the housing 10 penetrates may be referred to as the "vertical direction Z", the press-fit direction of the sensor component 1 to the mounting hole 10a may be referred to as the "lower side Z2", and the opposite direction may be referred to as the "upper side Z1".
[0037] The sensor body 2 is made by two-color molding, and the temperature measuring unit 3 described later is embedded by insert molding. The sensor body 2 includes: a primary molded portion 6 made by primary molding, a secondary molded portion 7 made by secondary molding, and a boundary portion 8 (hereinafter may be referred to as the boundary portion 8) between the primary molded portion 6 and the secondary molded portion 7. The primary molded portion 6 and the secondary molded portion 7 are coaxially arranged.
[0038] like Figure 1 , Figure 2 As shown, the primary molding part 6 includes: a columnar detection unit 61, which includes a detection element 31 (such as Figure 2 and a first mounting portion 62, which includes a first arrangement portion 63 continuous with the upper side Z1 of the detection unit 61 and on which the first O-ring 4 is arranged.
[0039] The detection unit 61 is made by embedding a part of the temperature measurement unit 3 including the detection element 31 , and is configured in a solid column shape having an axis extending in the vertical direction Z.
[0040] like Figure 2 As shown, the first mounting portion 62 is coaxially arranged with the detection unit 61 and is cylindrical, and its diameter is larger than the diameter of the detection unit 61. The first mounting portion 62 is provided with a first arrangement portion 63, in which the first O-ring 4 described later can be arranged. Figure 2 As shown, the first arrangement portion 63 includes: a first bottom surface 63A, which is provided at a position recessed from the outer peripheral surface of the first mounting portion 62 toward the central axis and is continuous around the axis of the first mounting portion 62; and a pair of first side surfaces 63B, 63B, which rise from both ends of the first bottom surface 63A in the vertical direction Z, and the first arrangement portion 63 is configured to have a groove shape on the outer peripheral surface of the first mounting portion 62. In the case where the first O-ring 4 is arranged in the first arrangement portion 63, the displacement of the first O-ring 4 in the vertical direction Z is limited by the pair of first side surfaces 63B, 63B.
[0041] like Figure 1 , Figure 2As shown, the secondary molded part 7 includes a secondary molded part main body 71, a second mounting part 72 and a connector part 73, the second mounting part 72 is continuous with the lower side Z2 of the secondary molded body main body 71 and includes a second arrangement part 74 on which a second O-ring 5 is arranged, and the connector part 73 is continuous with the upper side Z1 of the secondary molded part main body 71 and can be connected to an external device (not shown).
[0042] The secondary molding part body 71 includes a columnar part 711, a flange part 712 and a pair of protrusions 713, 713, the columnar part 711 is coaxially arranged with the primary molding part 6 and is constructed to have a columnar shape having a diameter larger than the diameter of the second mounting part 72 described later, the flange part 712 is arranged at the upper end of the columnar part 711 and protrudes in the thickness direction, and the pair of protrusions 713, 713 are arranged at the upper end of the columnar part 711 and protrude from the outer peripheral surface of the columnar part 711 in a direction away from each other.
[0043] like Figure 2 As shown, the second mounting portion 72 is coaxially arranged with the secondary molded portion main body 71 and the first mounting portion 62, and is columnar, and its diameter is substantially the same as the diameter of the first mounting portion 62. The second mounting portion 72 is provided with a second arrangement portion 74, in which the second O-ring 5 described later can be arranged. Figure 2 As shown, the second arrangement portion 74 includes a second bottom surface 74A and a pair of second side surfaces 74B, 74B, the second bottom surface 74A is provided at a position recessed from the outer peripheral surface of the second mounting portion 72 toward the central axis side and is continuous around the axis of the second mounting portion 72, the pair of second side surfaces 74B, 74B rise from both ends of the second bottom surface 74A in the vertical direction Z, and the second arrangement portion 74 is configured to have a groove shape on the outer peripheral surface of the second mounting portion 72. In a case where the second O-ring 5 is arranged in the second arrangement portion 74, the pair of second side surfaces 74B, 74B restricts displacement of the second O-ring 5 in the vertical direction Z.
[0044] like Figure 2 As shown, the connector portion 73 includes: a connector portion main body 731 and a pair of external connection portions 732, 732, the connector portion main body 732 is a cylindrical shape arranged coaxially with the secondary molded portion main body 71 and its axis is located in the vertical direction Z, and the pair of external connection portions 732, 732 are each a part of a pair of conductor portions 32, 32 constituting the temperature measurement unit 3 described later, and are arranged to be exposed inside the connector portion main body 731. The connector portion 73 is connected to an external device (not shown), and is configured to transmit the temperature of the measurement target.
[0045] like Figure 2As shown, the boundary portion 8 includes a first upper surface 81, a protrusion 82, a second lower surface 83 and a recess 84, the first upper surface 81 (interface) is a flat circle of the first mounting portion 62 of the primary molded portion 6, the protrusion 82 is arranged at the center of the first upper surface 81 and protrudes from the center, the second lower surface 83 (interface) is a flat circle of the second mounting portion 72 of the secondary molded portion 7, and the recess 84 is arranged at the center of the second lower surface 83 and is recessed from the center to match the protrusion 82.
[0046] The first upper surface 81 is circular and has a flat surface perpendicular to the axis of the primary molded portion 6. The second lower surface 83 is circular and has a flat surface perpendicular to the axis of the secondary molded portion 7. These first upper surface 81 and second lower surface 83 are configured to face each other with a slight gap S therebetween when the sensor component 1 is completed.
[0047] Here, in a generally available resin molded product manufactured by two-color molding, the gap between the primary molded portion and the secondary molded portion may be sealed using, for example, a potting agent, but in the present embodiment, the gap S between the first upper surface 81 and the second lower surface 83 is not sealed using a potting agent or the like. As a result, when the sensor component 1 is completed, a minute gap S is formed between the first upper surface 81 and the second lower surface 83. In the present embodiment, heat transfer between the primary molded portion 6 and the secondary molded portion 7 is blocked by the minute gap S between the first upper surface 81 and the second lower surface 83, thereby suppressing heat radiation from the primary molded portion 6 to the secondary molded portion 7.
[0048] like Figure 2 As shown, the temperature measurement unit 3 includes: a detection element 31 that detects the temperature of the measurement target; and a pair of conductor parts 32, 32 connected to both ends of the detection element 31. The pair of conductor parts 32, 32 is such that a part of each conductor part 32 is embedded in the primary molded part 6 and the secondary molded part main body 71 and the second mounting part 72 of the secondary molded part 7, and the external connection part 732 as the other part is set to be exposed inside the connector part 73.
[0049] The first O-ring 4 is made of a waterproof material. The first O-ring 4 is configured in an annular shape and can be arranged in the first arrangement portion 63. In a state where the first O-ring 4 is arranged in the first arrangement portion 63, the outer peripheral surface of the first O-ring 4 is arranged on a side away from the central axis relative to the outer peripheral surface of the first mounting portion 62, and in a state where the sensor component 1 is press-fitted into the mounting hole 10a, the outer peripheral surface of the first O-ring 4 is configured to elastically contact with the inner peripheral surface of the mounting hole 10a.
[0050] The second O-ring 5 is made of an oil-proof material. The second O-ring 5 is configured in an annular shape and is configured to be arranged in the second arrangement portion 74. In a state where the second O-ring 5 is arranged in the second arrangement portion 74, the outer peripheral surface of the second O-ring 5 is arranged on a side away from the central axis relative to the outer peripheral surface of the second mounting portion 72, and in a state where the sensor component 1 is press-fitted into the mounting hole 10a, the outer peripheral surface of the second O-ring 5 is configured to elastically contact with the inner peripheral surface of the mounting hole 10a.
[0051] When manufacturing the sensor component 1, the detection element 31 is electrically connected between a pair of conductor parts 32, 32, and the detection element 31 and the pair of conductor parts 32, 32 are placed at a predetermined position in a mold (not shown). In this state, the molten resin is injected into the mold (one injection of the molten resin). As the injection proceeds, the one injection of the molten resin into the interior of the mold is completed. Thereafter, the molten resin hardens in the mold. As a result, the one-time molding part 6 in which the detection element 31 and the pair of conductor parts 32, 32 are partially embedded is molded.
[0052] Then, the molten resin is injected into the interior of the mold (secondary injection of the molten resin). As the secondary injection proceeds, the secondary injection of the molten resin into the mold is completed. Thereafter, the molten resin hardens in the mold. As a result, the secondary molded portion 7 is molded to overlap with the primary molded portion 6. In this case, the first upper surface 81 of the primary molded portion 6 and the second lower surface 83 of the secondary molded portion 7 face each other, and a small gap S is formed between the first upper surface 81 and the second lower surface 83.
[0053] After that, the first O-ring 4 is arranged in the first arrangement portion 63 provided in the primary molded portion 6, and the second O-ring 5 is arranged in the second arrangement portion 74 provided in the secondary molded portion 7. In this way, the sensor component 1 is completed. When the sensor component 1 is completed, a minute gap S is formed between the first upper surface 81 and the second lower surface 83 in the boundary portion 8 between the primary molded portion 6 and the secondary molded portion 7. That is, in the present embodiment, the sensor component 1 is completed in a state where the minute gap S between the first upper surface 81 and the second lower surface 83 is not sealed.
[0054] Subsequently, when the completed sensor component 1 is assembled into the mounting hole 10a of the housing 10, the end of the sensor component 1 is brought closer to the upper end of the mounting hole 10a to be inserted (press-fitted) therein. As the insertion proceeds, the sensor component 1 reaches a predetermined position in the mounting hole 10a. In this case, the outer peripheral surface of the first O-ring 4 is in elastic contact with the inner peripheral surface of the mounting hole 10a, and the outer peripheral surface of the second O-ring 5 is in elastic contact with the inner peripheral surface of the mounting hole 10a. In this state, the second O-ring 5, the boundary portion 8 between the primary molding portion 6 and the secondary molding portion 7, and the first O-ring 4 are arranged in the above order in the press-fit direction of the sensor component 1. In this way, the assembly of the sensor component 1 into the mounting hole 10a of the housing 10 is completed.
[0055] According to the above embodiment, the sensor component 1 includes a sensor body 2, a detection element 31 (detection device) and a pair of O-rings 4, 5, and the sensor body 2 includes: a primary molded portion 6, which is made by primary molding and in which the detection element 31 is embedded; a secondary molded portion 7, which is made by secondary molding and is arranged on the opposite side of the press-fitting direction of the mounting hole 10a of the primary molded portion 6; and a boundary portion 8, which is located between the primary molded portion 6 and the secondary molded portion 7, wherein the primary molded portion 6 includes a first arrangement portion 63, on which a first O-ring 4 (one of a pair of O-rings 4, 5) is arranged, and the secondary molded portion 7 includes a second arrangement portion 74, on which a second O-ring 5 (the other of a pair of O-rings 4, 5) is arranged, and the second arrangement portion 74, the boundary portion 8 and the first arrangement portion 63 are arranged in the press-fitting direction in the above order. Therefore, when the sensor component 1 is press-fitted into the mounting hole 10a, the boundary portion 8 between the primary molded portion 6 and the secondary molded portion 7 is sealed by the first O-ring 4 and the second O-ring 5, thereby being able to suppress water (fluid) from penetrating into the boundary portion 8. Specifically, the arrangement portions 63 and 74 for arranging the O-rings 4 and 5 are respectively provided on the primary molded portion 6 and the secondary molded portion 7 to achieve a simple structure, that is, a simplified shape, while being able to suppress water from penetrating into the boundary portion 8.
[0056] Furthermore, the boundary portion 8 includes: a first upper surface 81 (interface) of the primary molded portion 6 and a second lower surface 83 (interface) of the secondary molded portion 7, which are arranged to face each other; and a small gap S provided between the first upper surface 81 and the second lower surface 83. The gap S hinders heat transfer between the first molded product and the second molded product, thereby being able to suppress a decrease in responsiveness due to heat radiation from the first molded product to the second molded product.
[0057] Furthermore, the first arrangement portion 63 is configured to have a groove shape on the outer peripheral surface of the primary molded portion 6, and the second arrangement portion 74 is configured to have a groove shape on the outer peripheral surface of the secondary molded portion 7. Therefore, by arranging the first O-ring 4 in the first arrangement portion 63, the movement of the first O-ring 4 in the vertical direction Z is restricted, and by arranging the second O-ring 5 in the second arrangement portion 74, the movement of the second O-ring 5 in the vertical direction Z is restricted, making it possible to further suppress the penetration of water (fluid) into (inside) the boundary portion 8.
[0058] Furthermore, in the case where water as a measurement target is contained on the press-fitting direction side of the mounting hole 10a, and oil is contained on the opposite side of the press-fitting direction of the mounting hole 10a, one of the pair of O-rings 4, 5 is made of a waterproof material, and the other of the pair of O-rings 4, 5 is made of an oil-proof material. In this way, the material of the O-ring and, for example, the diameter of the O-ring can be freely selected for the primary molded portion 6 and the secondary molded portion 7, so that the sensor can be designed according to the external environment. Thus, a sensor structure suitable for the purpose can be provided.
[0059] The present invention is not limited to the above-described embodiments, and includes other configurations capable of achieving the objects of the present invention, and the present invention also includes modifications such as those shown below.
[0060] In this embodiment, there is a small gap S between the first upper surface 81 and the second lower surface 83, and no potting agent or the like is used to seal them, but the present invention is not limited thereto. It should be understood that the scope of the present invention includes sensor components made without using a potting agent or the like for sealing. Whether the gap S formed without using a potting agent or the like for sealing is a small gap S or an air layer between the first upper surface 81 and the second lower surface 83 that are slightly spaced apart, such a configuration should be included in the scope of the present invention.
[0061] In addition, although the best configuration, method, etc. for performing the present invention are disclosed in the above description, the present invention is not limited thereto. That is, although the present invention is mainly specifically illustrated and described with respect to specific embodiments, those skilled in the art can make various modifications to the above embodiments in terms of shape, material, quantity, and other detailed structures without departing from the scope of the technical ideas and purposes of the present invention. Therefore, since the description of the limited shapes, materials, etc. disclosed above is provided as an illustrative example to facilitate understanding of the present invention and is not intended to limit the present invention, the description with the component name will be included in the present invention, and some or all of the restrictions on the shapes, materials, etc. will be deleted from the description.
Claims
1. A sensor component, which is used to be press-fitted into a mounting hole provided in a housing to detect a physical quantity of a measurement target, the sensor component comprising: A rod-shaped sensor body, the sensor body being used to be press-fitted into the mounting hole; a detection device, the detection device being disposed on a press-fitting direction side of the mounting hole of the sensor body, the detection device being configured to detect a physical quantity of the measurement target; as well as a pair of O-rings, which are disposed on the sensor body and are capable of making close contact with the inner surface of the mounting hole, Wherein, the sensor body is made by two-color molding, Wherein, the sensor body comprises: a primary molding part, which is formed by primary molding and in which the detection device is embedded; a secondary molded portion, which is formed by secondary molding and is disposed on the opposite side of the primary molded portion from the press-fitting direction of the mounting hole; and a boundary portion, the boundary portion being located between the primary molded portion and the secondary molded portion, wherein the primary molding portion comprises a first arrangement portion, and one of the pair of O-rings is arranged on the first arrangement portion, The secondary molded portion includes a second arrangement portion on which the other O-ring of the pair of O-rings is arranged, and The second arrangement portion, the boundary portion, and the first arrangement portion are sequentially arranged in this order in the press-fit direction.
2. The sensor component according to claim 1, wherein: The boundary portion includes: interfaces of the primary molded portion and the secondary molded portion disposed facing each other; and A small gap is provided between the interfaces.
3. The sensor component according to claim 1 or 2, wherein: The first arrangement portion is configured to have a groove shape on an outer peripheral surface of the primary molded portion, and The second arrangement portion is configured to have a groove shape on an outer peripheral surface of the secondary molded portion.
4. The sensor component according to claim 1 or 2, wherein: In a case where water as the measurement target is contained on the press-fitting direction side of the mounting hole and oil is contained on the opposite side of the press-fitting direction of the mounting hole, one of the pair of O-rings is made of a waterproof material and the other of the pair of O-rings is made of an oil-proof material.