Packaging structure of automobile brake liquid level sensor

Abstract

The utility model discloses a packaging structure of an automobile brake liquid level sensor, which is applied to a passenger car brake liquid kettle and comprises a shell, a sealing ring, a sealing ring and a sealing ring. The circuit board is detachably fixed in the mounting groove, and the circuit board is provided with a profiling groove; the reed switch is embedded in the profiling groove, and pins at the two ends of the reed switch are electrically connected with a circuit board respectively; the plug pin is fixed with the shell, the first end of the plug pin is electrically connected with the circuit board, and the second end of the plug pin extends into the slot; the mounting groove is filled with an epoxy resin layer, and the circuit board and the reed switch are coated with the epoxy resin layer; according to the utility model, even when the sensor vibrates or is subjected to thermal shock, the reed switch and the circuit board can be relatively fixed in position, so that the accuracy of liquid level measurement of the reed switch is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of automobile parts, and specifically relates to a packaging structure of automobile brake brake fluid level sensor. BACKGROUND

[0002] The fluid level sensor of automobile brake brake is mainly used for detecting the fluid level of brake fluid, and converting the change of fluid level into electric signal, and then providing for relevant electronic control system or brake fluid level display system. When the fluid level of brake fluid is lower than the set value, the relevant system will issue an alarm to remind the driver to add brake fluid in time.

[0003] The function of brake fluid level sensor is to ensure the normal work of brake system. If the brake fluid is insufficient, it may cause poor brake effect and affect driving safety. Therefore, the driver should check the fluid level of brake fluid regularly to ensure that it is within the normal range.

[0004] This kind of fluid level sensor is usually composed of sensor body, float and metal shell. When the fluid level changes, the float will move up and down accordingly, so as to change the closing or opening of reed tube contact in the sensor body, and output corresponding electric signal.

[0005] The principle of reed tube measuring fluid level is based on the interaction of magnetic field and electric current and the physical properties of liquid. In fluid level measurement, reed tube is usually used with float. When the fluid level changes, the float will move up and down accordingly, so as to change the magnetic field around the reed tube. This change will cause the contact in the reed tube to close or open, and then output corresponding electric signal. Specifically, when the fluid level rises, the float rises accordingly, so that the magnetic field around the reed tube changes. This change causes the contact in the reed tube to close, and outputs corresponding electric signal. When the fluid level drops, the float drops accordingly, the magnetic field changes, the contact opens, and the electric signal is output. The method of reed tube measuring fluid level has the advantages of simple structure, stable performance, high precision, etc.

[0006] In the existing reed tube installation mode, part of it is shown in Figure 8 , the reed tube is installed on the PCB in plug-in mode, and needs to be bent and assembled, and the other part is shown in Figure 9 , the pins of the reed tube are connected by wires, and then the reed tube is inserted into the shell. These two ways are difficult to ensure the accurate positioning of the contact position of the reed tube when the sensor vibrates or is subjected to cold and hot impact, so as to ensure the accuracy of the fluid level measurement result. SUMMARY

[0007] The utility model aims at the problems existing in the prior art, provides a packaging structure of automobile brake brake fluid level sensor, which can relatively fix the position of the reed tube and the circuit board even when the sensor vibrates or is subjected to cold and hot impact, so as to ensure the accuracy of the reed tube measuring fluid level.

[0008] To achieve the above object, the utility model adopts the technical scheme of:

[0009] A kind of packaging structure of automobile brake brake fluid level sensor, it is applied to passenger car brake liquid kettle, comprising: shell, the shell is equipped with installation groove and counter slot;Circuit board, the circuit board can be detached and fixed in the installation groove, the circuit board is equipped with profiled slot;Dry Reed, the dry Reed is embedded in the profiled slot, the both ends pin of the dry Reed is electrically connected with circuit board respectively;Pin, the pin is fixed with the shell, the first end of the pin is electrically connected with the circuit board, the second end of the pin extends into the counter slot;The installation groove is filled with epoxy resin layer, and the epoxy resin layer covers the circuit board and the dry Reed.

[0010] The shape and size of the profiled slot are set to when the dry Reed is embedded in the profiled slot, the both ends pin of the dry Reed is in parallel with the contact of the circuit board, and the both ends pin of the dry Reed is welded with the contact of the circuit board.

[0011] The counter slot is sleeved with a sleeve, the outer wall of the sleeve is provided with a hook, the sidewall of the counter slot is provided with a slot, the hook is matched with the slot, and the inner wall of the sleeve is provided with a counter plug guide.

[0012] The inner end of the sleeve is provided with a sealing ring between the counter slot.

[0013] The dry Reed is coated with a first silica gel layer between the profiled slot, a second silica gel layer is provided between the circuit board and the epoxy resin layer, and the second silica gel layer covers the dry Reed.

[0014] The four peripheral edges of the circuit board are provided with a plurality of through holes, and the bottom of the installation groove is provided with a plurality of clamping columns corresponding to the through holes.

[0015] The first end of the pin is provided with a connecting column, the circuit board is provided with a connecting hole corresponding to the connecting column, the connecting column is inserted into the connecting hole and is electrically connected.

[0016] Compared with the prior art, the utility model has the beneficial effects that:

[0017] 1. By setting profiled slot on the circuit board, when the dry Reed is embedded in the profiled slot, the profiled slot supports and positions the dry Reed, even when the sensor vibrates or is subjected to cold and hot impact, the position of the dry Reed and the circuit board is relatively fixed, thereby ensuring the accuracy of the dry Reed measuring liquid level.

[0018] 2, first silica gel layer in the profiled groove, then put the dry reed, after the glue dry, the dry reed is fixed in the profiled groove; the second silica gel layer cooperates with the first silica gel layer, completely covers the dry reed, and protects the dry reed from the thermal shrinkage of the epoxy resin at high and low temperatures. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is an exploded view of the liquid level sensor in an embodiment of the present application;

[0020] Figure 2 is an overall view of the liquid level sensor in an embodiment of the present application;

[0021] Figure 3 is a sectional view of the liquid level sensor in an embodiment of the present application;

[0022] Figure 4 is a perspective view of the shell in an embodiment of the present application;

[0023] Figure 5 is a perspective view of the sleeve in an embodiment of the present application;

[0024] Figure 6 is a perspective view of the circuit board in an embodiment of the present application;

[0025] Figure 7 is a perspective view of the dry reed in an embodiment of the present application;

[0026] Figure 8 is a schematic view of the dry reed connection mode in the prior art;

[0027] Figure 9 is a schematic view of the dry reed connection mode in the prior art;

[0028] In the figure: 1, shell; 2, mounting groove; 3, plug-in groove; 4, circuit board; 401, connecting hole; 5, profiled groove; 6, dry reed; 7, pin; 701, connecting column; 8, epoxy resin layer; 9, sleeve; 901, plug-in guide bar; 10, sealing ring; 11, first silica gel layer; 12, second silica gel layer. DETAILED DESCRIPTION

[0029] The technical scheme of the present application will be described clearly and completely below with reference to the drawings in the present application. Obviously, the described embodiments are only some embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the present application.

[0030] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0031] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0032] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] like Figures 1 to 7 As shown, a packaging structure for an automotive brake fluid level sensor, applied to a brake fluid reservoir in a passenger vehicle, includes: a housing 1, which has a mounting groove 2 and a mating slot 3, the mating slot 3 being used to connect with an external socket to transmit signals to the outside; a circuit board 4, which is detachably fixed in the mounting groove 2, and has a contoured groove 5; a reed switch 6, which is embedded in the contoured groove 5, and its two ends are electrically connected to the circuit board 4; a pin 7, which is fixed to the housing 1, with its first end electrically connected to the circuit board 4 and its second end extending into the mating slot 3; and an epoxy resin layer 8 encapsulated in the mounting groove 2, the epoxy resin layer 8 covering the circuit board 4 and the reed switch 6.

[0034] By setting a contour groove 5 on the circuit board 4, when the reed switch 6 is embedded in the contour groove 5, the contour groove 5 plays a supporting and positioning role for the reed switch 6. Even when the sensor vibrates or is subjected to thermal shock, the position of the reed switch 6 relative to the circuit board 4 can be fixed, thereby ensuring the accuracy of the reed switch 6 in measuring the liquid level.

[0035] In one embodiment, the shape and size of the profiling groove 5 are set so that when the reed switch 6 is embedded in the profiling groove 5, the two end pins of the reed switch 6 are in parallel contact with the circuit board 4, and the two end pins of the reed switch 6 are welded with the contacts of the circuit board 4.

[0036] For example, since the shape of the reed switch 6 is a cylinder, the profiling groove 5 can be set as a rectangular hole, and the width of the profiling groove 5 is smaller than the diameter of the reed switch 6, so as to adjust the depth of the lower half of the reed switch 6 embedded in the profiling groove 5, that is, the two end pins of the reed switch 6 are in parallel contact with the upper end surface of the circuit board. By adjusting the shape and size of the profiling groove 5, the two end pins of the reed switch 6 are in parallel contact with the circuit board 4, thereby facilitating automatic welding of the pins and the contacts, ensuring accurate and stable contact of the pins and the contacts, and ensuring stable signal transmission.

[0037] In one embodiment, the socket 3 is sleeved with a sleeve 9, the outer wall of the sleeve 9 is provided with a clamping hook, the side wall of the socket 3 is provided with a clamping groove, the clamping hook and the clamping groove are clamped and matched, and the inner wall of the sleeve 9 is provided with a socket guide 901. The socket guide 901 in the sleeve 9 is used for sliding guidance when the socket is plugged in, and protects the socket 3 from being worn out. When the socket guide 901 is worn out, the sleeve 9 can be directly replaced.

[0038] In one embodiment, a sealing ring 10 is arranged between the inner end of the sleeve 9 and the socket 3. The sealing ring 10 is used to prevent liquid from entering the socket from the clamping groove of the sleeve 9, so as to cause damage to the internal electronic components.

[0039] In one embodiment, a first silica gel layer 11 is coated between the reed switch 6 and the profiling groove 5, and a second silica gel layer 12 is arranged between the circuit board 4 and the epoxy resin layer 8, and the second silica gel layer 12 covers the reed switch 6. First, the first silica gel layer 11 is coated in the profiling groove 5, then the reed switch 6 is placed, and after the glue is dry, the reed switch 6 is fixed in the profiling groove 5; the second silica gel layer 12 cooperates with the first silica gel layer 11 to completely cover the reed switch 6, so as to protect it from the influence of thermal shrinkage of the epoxy resin at high and low temperatures.

[0040] In one embodiment, the four peripheral edges of the circuit board 4 are provided with a plurality of through holes, the bottom of the mounting groove 2 is provided with a plurality of clamping columns corresponding to the through holes, and the clamping columns and the through holes are inserted and matched, so as to clamp and position the circuit board 4.

[0041] In one embodiment, the first end of the pin 7 is provided with a connecting column 701, the circuit board 4 is provided with a connecting hole 401 corresponding to the connecting column 701, and the connecting column 701 and the connecting hole 401 are inserted and matched, so as to realize quick electrical connection of the pin 7 and the circuit board 4; preferably, the connecting column 701 and the connecting hole 401 are inserted and matched and then welded and fixed, so as to ensure the stability of the connection.

[0042] The application is installed by loading the circuit board 4 into the installation slot 2 of the shell 1, inserting the clamping column of the installation slot 2 into the through hole of the circuit board 4, clamping and positioning the circuit board 4, coating silica gel into the installation slot 2, adhering and fixing the reed switch 6 in the profiling slot 5, covering the upper side of the reed switch 6 with silica gel, and finally filling the installation slot 2 with epoxy resin.

[0043] The working principle of the application is that the sensor is installed in the brake liquid tank, the insertion slot 3 is connected with the socket, when the liquid level of the brake liquid tank rises or falls, the float ball in the brake liquid tank also rises or falls, so that the float ball approaches or moves away from the reed switch 6 of the sensor, the reed switch 6 outputs corresponding electric signals to the circuit board 4 based on the change, and the circuit board 4 transmits the electric signals to the socket through the insertion pin 7.

[0044] Although the embodiments of the application have been shown and described, it is to be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the application, the scope of the application is defined by the appended claims and their equivalents.

Claims

1. A packaging structure of an automobile brake fluid level sensor applied to a passenger car brake fluid reservoir, characterized in that, The utility model relates to a shell (1) is equipped with installation slot (2) and counterplug slot (3), circuit board (4) is detachably fixed in installation slot (2), and circuit board (4) is equipped with profiled slot (5), dry reed (6) is embedded in profiled slot (5), and both ends pin of dry reed (6) are electrically connected with circuit board (4) respectively, pin (7) is fixed with shell (1), and the first end of pin (7) is electrically connected with circuit board (4), and the second end of pin (7) extends to counterplug slot (3) inside, epoxy resin layer (8) is filled in installation slot (2) inside, and epoxy resin layer (8) covers circuit board (4) and dry reed (6). The shape and size of the profiled slot (5) are set such that when the dry reed (6) is embedded in the profiled slot (5), the two end pins of the dry reed (6) are in parallel contact with the circuit board (4), and the two end pins of the dry reed (6) are welded with the contacts of the circuit board (4). The counterplug slot (3) is sleeved with a sleeve (9), the outer wall of the sleeve (9) is provided with a hook, the side wall of the counterplug slot (3) is provided with a clamping groove, the hook is clamped and matched with the clamping groove, and the inner wall of the sleeve (9) is provided with a counterplug guide strip (901). A sealing ring (10) is arranged between the inner end of the sleeve (9) and the counterplug slot (3). A first silica gel layer (11) is coated between the dry reed (6) and the profiled slot (5), a second silica gel layer (12) is arranged between the circuit board (4) and the epoxy resin layer (8), and the second silica gel layer (12) covers the dry reed (6). The four peripheral edges of the circuit board (4) are provided with a plurality of through holes, the bottom of the installation slot (2) is provided with a plurality of clamping columns corresponding to the through holes, and the clamping columns are inserted and matched with the through holes.

2. The packaging structure of a brake fluid level sensor for an automobile according to claim 1, wherein The first end of the pin (7) is provided with a connecting column (701), the circuit board (4) is provided with a connecting hole (401) corresponding to the connecting column (701), the connecting column (701) is inserted and matched with the connecting hole (401), and electrical connection is realized.

3. The packaging structure of a brake fluid level sensor for an automobile according to claim 1, wherein ​ 4. The packaging structure of a brake fluid level sensor for an automobile according to claim 3, wherein ​ 5. The packaging structure of a brake fluid level sensor for an automobile according to claim 1, wherein ​ 6. The packaging structure of a brake fluid level sensor for an automobile according to claim 1, wherein ​ 7. The packaging structure of a brake fluid level sensor for an automobile according to claim 1, wherein ​

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