temperature sensor

Abstract

The utility model provides a kind of temperature sensor for measuring gearbox oil temperature, including connector, protective shell and thermistor component. Connector includes shell body and terminal fixed to shell body, thermistor component includes thermistor and pin, and thermistor is placed in protective shell. Protective shell is detachably set on the shell body of connector, and protective shell includes clamping portion, limiting protrusion, shell and the receiving portion of the hollow structure for accommodating thermistor, while, filter paper is equipped in receiving portion. The temperature sensor of the utility model, using clamping structure simplifies process, reduces cost, and by hollow structure, gearbox oil can directly contact thermistor, improve response speed, prevent impurities from adhering by setting filter paper, ensure measurement accuracy. The sensor structure is simple, reaction speed is fast, cost is low, and has good application prospect.

Description

Technical Field

[0001] This utility model relates to a temperature sensor, and more particularly to a temperature sensor for measuring the temperature of transmission oil, belonging to the field of sensor technology. Background Technology

[0002] Transmission fluid temperature is a crucial parameter affecting transmission performance and lifespan, and it is typically measured using a temperature sensor. Currently, common transmission fluid temperature measurement devices usually employ a negative temperature coefficient thermistor (NTC) as the temperature sensing element, and transfer the heat from the transmission fluid to the NTC through a metal housing and thermally conductive adhesive to achieve temperature measurement.

[0003] However, this traditional measurement method has the following problems: First, the transmission fluid needs to pass through a metal housing and thermally conductive adhesive to transfer heat to the NTC, which reduces the sensor's response time and requires high sensitivity from the NTC; second, the metal housing is expensive and requires pressing or injection molding processes to achieve the connection, which increases production costs and process complexity.

[0004] Therefore, a simple, fast-responding, and low-cost transmission oil temperature measuring device is needed to solve the above-mentioned technical problems. Utility Model Content

[0005] The purpose of this invention is to provide a temperature sensor for measuring transmission oil temperature, aiming to solve the problems of slow response time, high cost, and complex manufacturing process of existing transmission oil temperature measuring devices.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A temperature sensor includes a connector, a protective housing, and a thermistor assembly. The connector includes a housing and terminals fixed to the housing. The thermistor assembly includes a thermistor and pins for connecting the thermistor to the terminals. The thermistor is housed within the protective housing, which is detachably mounted on the housing of the connector.

[0008] Preferably, the protective shell includes a snap-fit ​​portion, a limiting protrusion, an outer shell, and a receiving portion for accommodating a thermistor.

[0009] Preferably, the snap-fit ​​portion includes an elastic arm and a snap fastener disposed at the free end of the elastic arm.

[0010] Preferably, the fastener protrudes radially inward, and a snap-fit ​​platform is provided on the outer side of the housing, and the fastener snaps onto the snap-fit ​​platform.

[0011] Preferably, the limiting protrusion is provided on the surface where the protective shell abuts against the connector, and cooperates with the groove provided in the connector to prevent the protective shell from rotating.

[0012] Preferably, the receiving part has a hollow structure.

[0013] Preferably, the receiving section is provided with filter paper.

[0014] Preferably, the bottom of the protective shell is provided with a lower end protrusion that surrounds the bottom of the protective shell, forming a lower end limiting groove between the protrusion and the inner wall of the receiving part. The shell is provided with an upper end protrusion facing the receiving part. The upper end protrusion surrounds the bottom of the shell and forms an upper end limiting groove between the protrusion and the inner wall of the shell. The upper and lower ends of the filter paper are clamped in the lower end limiting groove and the upper end limiting groove, thereby surrounding the protective shell and playing a role in protecting the thermistor.

[0015] Preferably, the thermistor is a negative temperature coefficient thermistor.

[0016] Preferably, the temperature sensor is used to measure the temperature of the transmission fluid.

[0017] Compared with existing technologies, the temperature sensor of this invention eliminates the metal housing and thermally conductive adhesive, replacing them with a snap-fit ​​structure of a protective shell and connector. This facilitates installation and disassembly, reduces production processes, lowers costs, simplifies the manufacturing process, and makes the product more competitive. Simultaneously, the perforated structure of the protective shell directly transfers heat to the thermistor, improving the sensor's response time. Furthermore, the filter paper prevents impurities in the oil from adhering to the thermistor, preventing short circuits and ensuring the sensor's response time. Attached Figure Description

[0018] Figure 1 This is a perspective view of the temperature sensor of this utility model.

[0019] Figure 2 This is an exploded perspective view of the temperature sensor of this utility model.

[0020] Figure 3 This is a schematic diagram of the interlocking structure of the shell and protective shell of this utility model.

[0021] Figure 4 This is a schematic diagram of the limiting protrusion of this utility model.

[0022] Component designation explanation

[0023] 1 Connector; 11 Housing; 12 Terminal; 18 Upper Boss; 19 Upper Limiting Groove; 2 Thermistor Assembly; 21 Thermistor; 22 Pin; 3 Protective Shell; 31 Snap-fit ​​Part; 32 Limiting Protrusion; 33 Receiving Part; 34 Housing; 311 Elastic Arm; 312 Buckle; 38 Lower Boss; 39 Lower Limiting Groove. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0025] like Figures 1 to 4 As shown, this utility model provides a temperature sensor, mainly used for measuring the temperature of transmission fluid. The temperature sensor includes a connector 1, a thermistor assembly 2, and a protective housing 3.

[0026] Connector 1 includes a housing 11 and terminals 12 fixed to the housing 11. The housing 11 is injection molded from engineering plastic and has good insulation and mechanical strength. The terminals 12 are fixed inside the housing 11 by injection molding or crimping and are used for connection to external circuitry.

[0027] The thermistor assembly 2 includes a thermistor 21 and a pin 22. Thermistor 21 is a negative temperature coefficient thermistor (NTC), whose resistance decreases as temperature increases, making it suitable for temperature measurement. Pin 22 electrically connects the thermistor 21 to terminal 12 for signal transmission.

[0028] The protective shell 3 is detachably mounted on the housing 11 of the connector 1. The protective shell 3 includes a snap-fit ​​portion 31, a limiting protrusion 32, a housing 34, and a receiving portion 33 for accommodating a thermistor. The snap-fit ​​portion 31 includes an elastic arm 311 and a latching member 312 disposed at the free end of the elastic arm 311. The latching member 312 protrudes radially inward, and a snap-fit ​​platform 111 is provided on the outer side of the housing 11. The latching member 312 snaps onto the snap-fit ​​platform 111, thereby realizing a detachable connection between the protective shell 3 and the connector 1.

[0029] The limiting protrusion 32 protrudes from the surface where the protective shell 3 abuts against the connector 1, and cooperates with the groove provided in the connector to prevent the protective shell 3 from rotating and ensure connection stability.

[0030] The housing 33 is designed with a hollow structure, allowing the transmission fluid to directly contact the thermistor 21, improving heat conduction efficiency and sensor response speed. The housing 33 contains filter paper 7 to prevent impurities in the transmission fluid from adhering to the pins 22, avoiding short circuits and ensuring normal sensor operation.

[0031] Specifically, the bottom of the protective shell 3 has a lower end protrusion 38 that surrounds the bottom of the protective shell 3, forming a lower end limiting groove 39 between it and the inner wall of the receiving part 33. The shell 11 has an upper end protrusion 18 facing the receiving part 33, which surrounds the bottom of the shell 11 and forms an upper end limiting groove 19 between it and the inner wall of the shell. The upper and lower ends of the filter paper 7 are sandwiched in the lower end limiting groove 39 and the upper end limiting groove 19, thus surrounding the protective shell 3 and protecting the thermistor 21.

[0032] During operation, the temperature sensor is installed in a suitable position on the transmission, allowing the protective housing 3 to be immersed in the transmission fluid. The transmission fluid comes into contact with the thermistor 21 through the perforated structure of the protective housing 3 and the filter paper 7. The resistance value of the thermistor 21 changes with temperature, and the signal is transmitted to the external circuit through the pin 22 and the terminal 12, thereby realizing the measurement of the transmission fluid temperature.

[0033] The temperature sensor provided by this utility model, through the combination of a hollow protective shell and filter paper, allows the thermistor to directly contact the transmission fluid, thereby improving the sensor's response speed. At the same time, the use of a snap-fit ​​structure to connect the protective shell and the connector simplifies the manufacturing process, reduces costs, and has good application prospects.

[0034] It will be apparent to those skilled in the art that various modifications and variations can be made to the exemplary embodiments of the present invention without departing from the spirit and scope of the present invention. Therefore, it is intended that the present invention cover modifications and variations falling within the scope of the appended claims and their equivalents.

Claims

1. A temperature sensor comprising a connector (1), a protective housing (3), and a thermistor assembly (2), wherein the connector (1) comprises a housing (11) and terminals (12) fixed to the housing (11), the thermistor assembly (2) comprises a thermistor (21) and pins (22) for connecting the thermistor (21) to the terminals (12), the thermistor (21) being housed within the protective housing (3), characterized in that, The protective shell (3) is detachably mounted on the housing (11) of the connector (1).

2. The temperature sensor as described in claim 1, characterized in that... The protective shell (3) includes a snap-fit ​​part (31), a limiting protrusion (32), an outer shell (34), and a receiving part (33) for accommodating a thermistor.

3. The temperature sensor as described in claim 2, characterized in that, The latching part (31) includes an elastic arm (311) and a latching member (312) disposed at the free end of the elastic arm (311).

4. The temperature sensor as described in claim 3, characterized in that, The buckle (312) protrudes radially inward, and a snap-fit ​​platform (111) is provided on the outer side of the housing (11), and the buckle (312) snaps onto the snap-fit ​​platform (111).

5. The temperature sensor as described in claim 2, characterized in that, The limiting protrusion (32) protrudes from the surface of the protective shell (3) that abuts against the connector (1) and engages with the groove provided in the connector to prevent the protective shell (3) from rotating.

6. The temperature sensor as described in claim 2, characterized in that, The receiving part (33) has a hollow structure.

7. The temperature sensor as described in claim 6, characterized in that, The containment section (33) is equipped with filter paper (7).

8. The temperature sensor as described in claim 7, characterized in that, The bottom of the protective shell (3) is provided with a lower end boss (38) that surrounds the bottom of the protective shell (3) and forms a lower end limiting groove (39) between it and the inner wall of the receiving part (33). The shell (11) is provided with an upper end boss (18) facing the receiving part (33). The upper end boss (18) surrounds the bottom of the shell (11) and forms an upper end limiting groove (19) between it and the inner wall of the outer shell (34). The upper and lower ends of the filter paper (7) are sandwiched in the lower end limiting groove (39) and the upper end limiting groove (19), thereby surrounding the receiving part (33) of the protective shell (3).

9. The temperature sensor as described in claim 1, characterized in that, The thermistor (21) is a negative temperature coefficient thermistor.

10. The temperature sensor as claimed in claim 1, characterized in that, The temperature sensor is used to measure the temperature of the transmission fluid.

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