JP2784717B2 - Composite sensor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optimal mixing sensor used for detecting a water temperature of, for example, an engine cooling system for an automobile.

[0002]

2. Description of the Related Art For example, an automobile is provided with an engine cooling system for sending cooling water into an engine room to cool an engine, sending the cooling water to a radiator for cooling, and circulating the cooling water again in the engine room. .

[0003] d Njinrumu to measure the water temperature of the engine compartment, the fuel injection in the engine based on the measurement value, the ignition timing, control of the idle speed and the like, other
For the purpose, two kinds of temperature sensors are installed.

Conventionally, the above-mentioned two types of temperature sensors use thermistors having different characteristics, and these thermistors have been integrated into one case (Japanese Utility Model Publication No. Sho 54-2146, Japanese Utility Model Publication No. Sho 54-2146). Jpn.

[0005]

However, in the prior art shown in Japanese Utility Model Publication No. 54-2146 and Japanese Utility Model Application Laid-Open No. 6-7029, it is possible to install two thermistors in different positions in the case. However, after assembling the thermistors, it is not possible to confirm whether each thermistor is installed in the correct position and whether the distance between the two thermistors is appropriate, and therefore, the two thermistors are not connected. It was not possible to guarantee that it was assembled as designed, and there was a possibility that performance as designed could not be achieved.

Further, since the lead wires from the two thermistors are bundled and pulled out, there is a possibility that the leads are erroneously wired.

[0007] It is an object of the present invention to provide a composite sensor in which the positional relationship between two thermistors is accurately regulated and can be assembled in a case.

[0008]

In order to achieve the above object, a composite sensor according to the present invention comprises a first thermistor and a second thermistor.
A composite sensor incorporating two thermistors and two thermistors
A capacitors, and a casing and the connector, the first sub
The temperature of the thermistor and the second thermistor is set separately.
The first thermistor having different characteristics
The star is formed in a ring shape with a through hole in the center.
And the second thermistor is housed in the case,
The case is a hollow container composed of a large-diameter portion and a small-diameter portion, and the large-diameter portion and the small-diameter portion are coaxially connected to each other, and the small-diameter portion has a large-diameter portion. It is a hollow structure with a bottom that is reduced in diameter from the part, the large diameter part is a hollow structure with an opening to insert the connector part, and a step part is formed between the small diameter part and the large diameter part. the first thermistor is held on the stepped portion of the case, the connector unit is composed of a base and tip, which are formed of resin, in the case
The base portion is formed by imitating the inner peripheral shape of the large diameter portion of the case, and the pointed end portion passes through the through hole of the first thermistor and is applied to the inside of the bottom of the small diameter portion of the case. The second thermistor is formed integrally with the base in the shape of a shape.
Has been embedded in the distal end of the tip, base portion fitted in the large diameter portion of the case, the apex end, case diameter through the first thermistor through-hole of the stepped portion Inside the bottom of the part
And, as a result, the second thermistor and the first thermistor
Each connector by assembling the connector to the case.
Those that will be installed in place of les.

The connector section has first and second thermistor connection terminals, and the second thermistor connection terminal is a second terminal buried across the pointed end and base of the connector section. The first thermistor connection terminal has a spring seat, and the spring seat is provided on an end face of the base facing the first thermistor on the step portion. is intended, the base, which has provided on an end face of the first thermistor facing the spring seat, the first thermistor electrode next, a spring between the bus I seat and the base is interposed, the spring Is to press-fit the first thermistor onto the case step portion via the pedestal and to electrically connect the spring seat and the pedestal.

[0010] Further, the connector portion has a projection claw,
The protruding claw is provided in an annular shape by protruding to the side of the base of the connector portion, and the case has a fixed claw,
Fixing claw is annularly provided <br/> et al is along the opening edge of the case the large diameter portion, is bent to the inner side engage the projections pawl compression spring
In this state, the connector is fixed in the case.

[0011] The large diameter portion of the case has a shoulder portion on the inner peripheral surface.
And the shoulders are inclined inward and along the circumferential direction.
An annular inclined surface, and a base portion of the connector portion;
Has a notch on the outer peripheral surface, and the notch is inclined inward.
It is an inclined surface that is inclined and formed annularly along the circumferential direction,
Make the notch abut the shoulder, and
This is for positioning the tip of the cusp part.

The shape of the inside of the bottom of the small diameter portion of the case is conical.
The connector has a conical tip
Formed in the small diameter part of the case.
Place the point of the connector on the bottom of the small diameter part of the case.
It will be positioned .

[0013]

The connector part to be assembled to the case has a base part and a tip part. The base part of the connector part is formed in the shape of the inner circumference of the large diameter part of the case, and the tip part of the connector part is the small diameter part of the case. It is formed in the shape of a bottom inner shape. A second thermistor is embedded at the tip of the connector.

The first thermistor is mounted and positioned on the step portion of the case, and the pointed end of the connector portion is applied to the inside of the bottom of the small diameter portion of the case through the through hole of the positioned first thermistor. Accordingly, the second thermistor is positioned with respect to the first thermistor when the second thermistor is positioned in the small diameter portion of the case.

Therefore, by assembling the connector portion in the case, the position of the second thermistor in the small-diameter portion of the case and the positional relationship of the second thermistor with respect to the positioned first thermistor are accurate. Will be guaranteed.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG.
FIG. 2 is a sectional view taken along line II-II of FIG. 1.

Referring to FIG. 1, the present invention is a composite sensor incorporating a first thermistor 1 and a second thermistor 2.
I have a case 3, and a connector 4.

The first thermistor 1 and the second thermistor 2 have different characteristics and measure temperature.
The first thermistor 1 is formed in a ring shape having a through hole 1a at the center.

The case 3 is a metal hollow container having a large diameter portion 3a and a small diameter portion 3b. Large diameter part 3a and small diameter part 3
b is coaxially and continuously provided, and the small diameter portion 3b
Is a hollow structure with a bottom having a diameter reduced from the large diameter portion 3a,
The large diameter portion 3a has a hollow structure having an opening into which the connector portion 4 is inserted, and a step portion 3 is provided between the small diameter portion 3b and the large diameter portion 3a.
c is formed.

The first thermistor 1 is installed on the step 3 c of the case 3 and mounted inside the case 3.

The connector part 4 includes a base part 4a and a pointed part 4b, and is formed of a resin having electrical insulation.

The base portion 4a is formed by imitating the inner peripheral shape of the case large-diameter portion 3a, and the pointed end 4b passes through the through hole 1a of the first thermistor 1 and has a case small-diameter portion 3b.
The second thermistor 2 is formed integrally with the base portion 4a in an image of the shape applied to the inside of the bottom portion of the base member, and the tip end portion is embedded.

Here, the bottom inner shape of the case small-diameter portion 3b is formed to be concave in a conical shape, and the tip 4b of the connector portion 4 is formed.
Is formed in a conical shape so that the pointed end 4b of the connector 4 is accurately positioned in the case small diameter portion 3b.

The connector 4 has a base 4a fitted into the case large-diameter portion 3a, and a pointed end 4b penetrating through the through hole 1a of the first thermistor 1 on the step 3c. And stored in Case 3
The second thermistor 2 is fixed at a fixed position in the case small-diameter portion 3b different from the installation position of the first thermistor 1.

Further, the connector section 4 has terminals 5 and 5 for connecting the second thermistor. Terminals 5 and 5 for connecting the second thermistor are buried in the base 4a of the connector section 4, and the sharp end 4b and the base 4 of the connector section 4 are provided.
a lead wire 2 of the second thermistor 2 buried across a
a and 2a are connected.

The connector section 4 has a first thermistor connecting terminal 6, a pedestal 7, and a spring 8.

The first thermistor connection terminal 6 is
It is embedded in the base 4 a of the connector part 4 and has a spring seat 9. The spring seat 9 is provided on an end face of the base 4a facing the first thermistor 1 on the step 3c,
The pedestal 7 is provided on an end face of the first thermistor 1 facing the spring seat 9 and forms an electrode of the first thermistor 1. The case 3 is used as the other electrode of the first thermistor 1.

The spring 8 is interposed between the spring seat 9 and the pedestal 7, presses the first thermistor 1 onto the case step 3b via the pedestal 7, and connects the spring seat 9 and the pedestal 7 to each other. They are electrically connected. The pedestal 7 is provided with a through-hole 7a through which the connector tip 4b is inserted.

The sleeve 10 has a tubular body made of an insulating material.
It surrounds the spring seat 9 and the pedestal 7 and electrically insulates them from the case 3. The sleeve 10 surrounds the spring 8, the spring seat 9, and the pedestal 7 and electrically insulates the case 3 from the wiring. can do.

The connector portion 4 has a projection claw 4c, and the projection claw 4c is provided annularly so as to protrude to the side of the base 4a of the connector portion 4.

On the other hand, the case 3 has a fixed claw 3d. The fixed claw 3d is provided annularly along the opening edge of the case large diameter portion 3a, and the fixed claw 3d is bent inward. The connector 4 is fixed in the case 3 by engaging with the projection claw 4c.

The case large diameter portion 3a has a shoulder 3e on the inner peripheral surface, and the shoulder 3e is inclined inward,
It is an inclined surface formed annularly along the circumferential direction.

On the other hand, the base portion 4a of the connector portion 4 has a notch 4d on the outer peripheral surface, and the notch 4d is inclined inward and formed in an annular shape along the circumferential direction. The notch 4d is brought into contact with the shoulder 3e,
The positioning of the pointed end 4b of the connector portion 4 within the position b is performed.

The packing 11 is interposed between the inner periphery of the opening edge of the case 3 and the outer periphery of the connector portion 4.
The inside is hermetically sealed. In addition, since the case is hermetically sealed using packing, the thermistor in the case can be protected.

In the embodiment, in order to assemble the composite sensor, the spring 8 and the
The pedestal 7 and the first thermistor 1 are mounted, and these are surrounded by a sleeve 10. In addition, the ring-shaped packing 11 is mounted inside the projection claw 4c of the connector portion 4.

Next, the connector 4 is inserted through the opening of the case 3 and the first thermistor 1 is connected to the step 3 c of the case 3.
, The connector portion 4 is pushed into the case 3 to compress the spring 8, and the first thermistor 1 is pressed on the step portion 3c of the case 3 via the pedestal 7 with the spring force. Position 1

Next, the connector portion 4 is further pushed into the case 3 so that the sharp end 4b of the connector portion 4 penetrates through the through hole 1a of the first thermistor 1 fixed on the case step portion 3c. The second thermistor 2 is inserted into the small diameter portion 3b, the tip of the pointed end 4b of the connector portion 4 is applied to the inside of the bottom of the case small diameter portion 3b, and the position of the second thermistor 2 in the small diameter portion 3b of the case is determined. The position is regulated, and the second thermistor 2 is installed in the case small diameter portion 3b.

The packing 11 of the connector 4 is pressed against the case 3, and the space between the connector 4 and the case 3 is hermetically sealed by the packing 11.

Finally, the fixed claw 3d of the case 3 is bent inward to engage with the projection claw 4c of the connector portion 4, and the case 3
The first thermistor 1, the second thermistor 2, and the connector part 4 are assembled in the case 3 to prevent the connector part 4 from coming off, and the assembly is completed.

In the embodiment, the large-diameter portion 3a and the small-diameter portion 3b of the case 3, the base portion 4a and the pointed end 4b of the connector portion 4 are provided.
Is a circular cross section, but is not limited to this, and may be a polygonal cross section. In this case, the rotation of the connector portion 4 in the case 3 can be prevented, and the thermistors 1 and 2 can be prevented from rotating.
2 can be more accurately positioned.

Further, the case 3 may be filled with silicone oil to eliminate the variation in the heat dissipation constant of the first thermistor 1 and the second thermistor 2 and to make the heat dissipation uniform.

The sleeve 10 may be made of an electrically insulating resin, and may be formed integrally with the base 4a of the connector 4. In this case, since the resin sleeve 10 is formed concentrically with the pointed end 4b of the connector part 4, the sleeve 10 is used for positioning the pedestal 7, the spring 8, the thermistor 1 and the like when they are assembled. Can be used as

The sleeve 10 is a cylindrical body. The sleeve 10 is molded integrally with the base 4a to form a container. Therefore, the sleeve 10 is used as a silicone oil metering cup. Can be quantified.

Although the mixed sensor of the present invention has been described for measuring the water temperature of an engine cooling system for an automobile, the present invention is not limited to this.

[0045]

As described above, according to the present invention, the pointed end of the connector portion in which the second thermistor is embedded is formed in the shape of the inside of the bottom of the case small diameter portion, and the first thermistor is formed. Attached to the case step and positioned
The position of the second thermistor in the case small-diameter portion is determined by penetrating the positioned through hole of the first thermistor and positioning the second thermistor with the sharp end of the connector portion applied to the inside of the bottom of the case small-diameter portion. In addition, the positioning of the second thermistor with respect to the positioned first thermistor can be performed accurately, and the positioning can be ensured by assembling the connector in the case. it can.

Further, the wiring for the second thermistor has a structure in which the second thermistor and its lead wire are embedded in a resin-molded connector portion, and the lead wire is connected to a terminal provided on the connector. The wiring to the thermistor is performed using a spring that biases the first thermistor. The wiring structures are different from each other, and the wiring paths are completely different. Wiring can be prevented.
Further, since the spring is also used for the wiring of the first thermistor and for fixing the first thermistor, the number of parts can be reduced.

Also, a spring, a spring seat, a pedestal, a first thermistor, and a sleeve are pre-assembled to the resin-molded connector portion, and the connector portion is inserted into the case. And the manufacturing process can be simplified.

Further, since the connector portion and the case are fixed by the engagement of the claws, the fixing structure can be simplified.

Further, the positioning of the second thermistor in the case can be performed more accurately by positioning the connector portion in the case.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st thermistor 1a Through-hole provided in 1st thermistor 2 2nd thermistor 3 Case 3a Large diameter part of case 3b Small diameter part of case 3c Step part of case 4 Connector part 4a Base part of connector 4b Tip of connector Reference Signs List 5 Second thermistor connection terminal 6 First thermistor connection terminal 7 Pedestal 8 Spring 9 Spring seat 10 Sleeve 11 Packing

Continuation of front page (56) References JP-A-64-23130 (JP, A) JP-A-1-253621 (JP, A) JP-A-4-24033 (JP, U) JP-A-56-161539 (JP) U.S. Pat. No. 4,141,331 (JP, U) U.S. Pat. No. 5,512,238 (JP, U) U.S. Pat. (US, A) (58) Field surveyed (Int. Cl. ⁶ , DB name) G01K 7/22

Claims (5)

(57) [Claims] A first thermistor and a second thermistor;
Is a composite sensor incorporating the two thermistors of
A first thermistor and a second thermistor, respectively.
The temperature is measured differently and has different characteristics.
Is formed in a ring shape with a through hole in the center
The second thermistor is stored in the case
The star is embedded in the connector portion, the case is a hollow container having a large diameter portion and a small diameter portion, and the large diameter portion and the small diameter portion are coaxially connected, and the small diameter portion is , A hollow structure with a bottom that is smaller in diameter than the large diameter part, the large diameter part is a hollow structure with an opening to insert the connector part, and a step is formed between the small diameter part and the large diameter part The first thermistor is held on a step portion of the case, and the connector portion is made of resin and has a base and a pointed end, and is inserted into the case. The pointed end is formed integrally with the base in a shape that passes through the through hole of the first thermistor and is applied to the inside of the bottom of the case small diameter portion. is formed, the second thermistor has been embedded in the tip of the tip portion
There, group unit is fitted in the large diameter portion of the casing, apex end reaches the bottom inside the case the small diameter portion through the through hole of the first thermistor on the stepped portion, as a result, the second Thermistor and the first
Connector portion and the thermistor to be assembled to the case of
Integrated sensor, characterized in that that will be installed in more respective position. 2. The connector section has first and second terminals for connecting the thermistor, and the second terminal for connecting the thermistor is a second terminal buried across the pointed end and the base of the connector section. the thermistor leads are connected, the first thermistor connection terminal has a spring seat, the spring seat, which has provided on an end surface of the base portion facing the first thermistor on the stepped portion, pedestal, which has provided on an end face of the first thermistor facing the spring seat, the electrode next to the first thermistor, a spring between the bus I seat and the base is interposed, the split
Ring is a composite sensor according to claim 1 together with pressure-bonding the first thermistor on case step portion via the pedestal, characterized in that the spring seat and the base is intended to electrically connect. 3. The connector section has a projection claw, the projection claw is provided in an annular shape so as to protrude to the side of a base of the connector section, and the case has a fixing claw, nails, annularly provided <br/> et al is along the opening edge of the case the large-diameter portion, engaged with the protrusion claw bent to the inner side compression spring
2. The composite sensor according to claim 1 , wherein the connector is fixed in the case in a state in which the connector is in a closed state . 4. The large diameter portion of the case has a shoulder portion on an inner peripheral surface, and the shoulder portion is an inclined surface that is inclined inward and is formed annularly along a circumferential direction. The base of the connector has a notch on the outer peripheral surface. The notch is an inclined surface that is inclined inward and is formed annularly along the circumferential direction. The notch abuts the shoulder. The composite sensor according to claim 1, wherein the tip of the connector portion is positioned within the small-diameter portion of the case. 5. The inner shape at the bottom of the small diameter portion of the case is conical.
It is formed concave, and the tip of the pointed end of the connector is
Formed in the small diameter part of the case
The tip of the taper part is located at the bottom of the small diameter part of the case.
Claims 1 and 2, characterized in that they are determined .
5. The composite sensor according to 3 or 4 .