JPH04110934U - temperature detection sensor - Google Patents

Abstract

(57) [Summary] [Purpose] To improve sealing performance, prevent cracks from occurring due to sudden temperature changes, and prevent the locking part from falling off when connecting or disconnecting an external connector. [Structure] A terminal 1 is supported by a fixed part 2, and a temperature sensing element 3 is connected to one end 1a. The temperature sensing element 3 is covered with a first seal part 4 and a second seal part 5 together with one end 1a of the terminal 1. The temperature sensing element 3 and the fixing part 2 covered with the first seal part 4 and the second seal part 5 are molded into the case 6 by insert resin. The case 6 has a locking portion 8 and a locking portion 10 on surfaces perpendicular to each other.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This idea is a temperature detection sensor that has a temperature sensing element built into the case that has the connector part. Regarding improvements to the sensor.

0002

[Conventional technology]

A conventional temperature detection sensor of this type is the one disclosed in Japanese Unexamined Patent Publication No. 2-227624. There was one. In this prior art, the lead wire of the temperature sensing element held by the fixed part is Insert the wire into the insertion hole and connect it to the terminal, and then insert the subassembly into the insert resin. It was molded to form a case.

0003

[Problem that the idea aims to solve]

The prior art as described above has the following problems. (1) Insert resin molding uses thermoplastic materials such as nylon and polyacetal. This is done using resin. However, this resin has a lower water absorption rate than epoxy resin. This was an order of magnitude higher, and there was a possibility that reliability would decrease during long-term use. (2) Stress can be applied to the temperature sensing element due to differences in the coefficient of thermal expansion of each part and sudden temperature changes. In addition, cracks may occur in the temperature sensing element. (3) When the case is provided with a connector part with a locking part and a locking part for the mounting member. When the external connector is inserted into or removed from the connector, the force applied to the locking portion causes the locking portion to close. There was a risk of falling off from the mounting member.

0004

[Means to solve the problem]

This idea addresses the above issues, and the first idea is to improve sealing performance. In order to achieve long-term stability, the temperature sensing element is attached to one end of the terminal supported on the fixed part. Provided is a temperature detection sensor equipped with a seal portion coated with. The second idea is to prevent cracks caused by differences in the coefficient of thermal expansion of various parts or sudden temperature changes. In order to prevent the occurrence of The present invention provides a temperature detection sensor configured with a two-layered structure. In addition, a lock is provided to prevent the locking part from falling off when connecting or disconnecting external connectors. Provided is a temperature detection sensor in which a part and a locking part are respectively provided on orthogonal surfaces of a case. .

[0005]

【Example】

The attached drawing is a drawing showing a preferred embodiment of the temperature detection sensor S according to this invention. Thus, FIG. 1 is a front view in cross section of the main part, and FIG. 2 is a right side view. In the figure, 1 is a terminal. The terminal 1 is supported by a fixed part 2, one of which A temperature sensing element 3 is connected to the end 1a. The fixing part 2 is made of thermoplastic resin. Applicable The temperature sensing element 3 is covered with a first seal portion 4 together with one end 1a of the terminal 1, and further Its surface is covered with a second seal portion 5. The first seal part 4 is relatively hard. The second seal portion 5 is made of a relatively soft material such as silicone resin. Consists of The two-layer structure of the first seal part 4 and second seal part 5 prevents sudden temperature changes. The accompanying thermal stress is buffered by the second seal portion 5. For example, the temperature detection sensor S is When installed in the engine compartment of a vehicle, it may become hot after the vehicle is running. Ru. In this state, if cold water is poured onto the temperature detection sensor S during a car wash, etc. , the temperature detection sensor S has a large temperature difference between the surface and inside of the case 6, which will be described later. Only the surface of the base 6 rapidly contracts, generating thermal stress. However, the second Since the seal portion 5 is a soft member, the above stress is not transmitted to the first seal portion 4 and Therefore, no cracks occur in the first seal portion 4 and the temperature sensing element 3. Moreover, the first seal part 4 and the second seal part 5, which have low water absorption rates, are connected to the temperature sensing element 3 and Since the terminal 1 and one end 1a of the terminal 1 are covered together, the waterproofness in this part is not good. Always good. Therefore, electrolytic corrosion does not occur and stable reliability is achieved during long-term use. can be done.

[0006] The temperature sensing element 3 covered with the first seal part 4 and the second seal part 5 and the fixing part 2 is insert molding using thermoplastic resin such as polyacetal or nylon resin. are doing. The outer shell constitutes the case 6. The case 6 includes a connector portion 7 with the other end 1b of the terminal 1 protruding, and the connector portion 7. A lock portion 8 formed on the outer wall of 7 and a mounting member 9 provided on the vehicle body, for example, are engaged with each other. It has a portion 10 and a protrusion 11. The locking portion 10, the protrusion 11 and the locking portion 8 are provided on orthogonal surfaces of the case 6. Therefore, the external connector is connected to the connector part 7. When inserting and removing the connector (not shown), the direction of the operating force for attaching and detaching the lock part 8 is particularly It acts perpendicularly to the direction in which the locking part 10 is removed from the mounting member 9. Therefore, the locking part 1 There is little risk that the 0 will fall off from the mounting member 9.

[0007]

[Effect of the idea]

This device, which has the above-mentioned structural effects, has the following effects. (1) The first idea is to cover the temperature sensing element with one end of the terminal supported on the fixed part. Equipped with a sealed seal part that improves sealing performance and is stable for long-term use. It is possible to obtain reliable performance. (2) The second idea is to make the seal part into a hard first seal part and a soft second seal part. The two-layer structure prevents cracking due to differences in the coefficient of thermal expansion of each part or sudden temperature changes. It is possible to prevent the occurrence of locks. (3) Also, since the locking part and the locking part are provided on the orthogonal surfaces of the case, the external This prevents the locking portion from falling off when the connector is inserted or removed.

[Brief explanation of drawings]

FIG. 1 is a sectional front view of a preferred embodiment of the invention.

FIG. 2 is a right side view of what is shown in FIG. 1;

[Explanation of symbols]

1 terminal 2 Fixed part 3 Temperature sensing element 4 First seal part 5 Second seal part 6 cases 7 Connector section 8 Lock section 10 Locking part 11 Protrusion

Claims (2)

[Scope of utility model registration request] 1. A temperature detection sensor in which a temperature sensing element is installed inside a case having a connector part, which comprises a terminal, a fixed part supporting the terminal, a temperature sensing element connected to one end of the terminal, and a temperature sensing element connected to one end of the terminal. A temperature detection sensor comprising: a seal portion that covers the temperature sensing element together with one end of the terminal; and a case in which the temperature sensing element covered by the seal portion and the fixing portion are insert-molded with resin. 2. The temperature detection sensor according to claim 1, wherein the seal portion has a two-layer structure including a hard first seal portion and a soft second seal portion.