JPH0311418Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an air regulator (auxiliary air valve) for an internal combustion engine.

<Conventional technology> Conventionally, in electronically controlled fuel injection internal combustion engines, air is taken in from an air cleaner through an air flow meter, a throttle chamber, and an intake manifold, and the flow rate is controlled by a throttle valve in the throttle chamber. However, an auxiliary air passage is provided that bypasses the throttle valve, and an air regulator installed in this auxiliary air passage increases the amount of air necessary for warm-up operation at low temperatures by bypassing the throttle valve. .

An example of this type of air regulator is the one shown in Figure 2 (Utility Model No. 58-127152).
(see publication).

To explain this, a cover 2 having an inlet passage 1 at an eccentric position and a main body 5 having an outlet passage 3 at an eccentric position and a bimetal chamber 4 at an opposite eccentric position are joined, and the space between these is joined. A shutter chamber 6 is formed in the shutter chamber 6, and an inlet passage 1 and an outlet passage 3 are opposed to each other through a part of the shutter chamber 6. An adjusting plate 8 having an opening 7 aligned with the outlet passage 3 is fixed to the end face of the main body 5 on the side of the shutter chamber 6, and a shutter 10 is rotatably attached to a pin 9 in the center of the adjusting plate 8. be.
A hole 11 is formed in a part of the shutter 10.

Further, the bimetal chamber 4 houses a bimetal 13 as a thermal displacement member around which a resistance wire 12 as an electric heater is wound, and a shutter 10 is engaged with the tip of the bimetal 13 by a spring (not shown).

Then, energization to the resistance wire 12 starts at the time of startup, but during warm-up operation, the bimetal 13 is still kept at a low temperature, so that the shutter 10
The inlet passage 1 and the outlet passage 3 communicate with each other through the aperture 11 . Therefore, a sufficient passage area of the communication portion between the inlet passage 1 and the outlet passage 3 is ensured, and the amount of bypass air is increased.

On the other hand, after the warm-up operation, the bimetal 13 becomes high in temperature, and the shutter 10 is rotated due to the thermal displacement, so that the opening 11 thereof no longer matches the inlet passage 1 and the outlet passage 3. Therefore, the communication between the inlet passage 1 and the outlet passage 3 is cut off, and the supply of bypass air is stopped.

<Problems to be solved by the invention> However, in such a conventional air regulator, the resistance wire 12 as an electric heater
The structure is such that the shutter 10 is driven by a bimetal 13, which is a thermal displacement member wrapped with a bimetallic material, and has the disadvantage that the structure for rotating the shutter 10 is complicated.

The present invention was developed in view of these conventional problems, and it solves the above-mentioned conventional drawbacks by improving the structure of the passage area control means that controls the passage area of the auxiliary air passage that bypasses the throttle valve. The purpose is to make it easier to change the characteristics of.

<Means for Solving the Problems> For this reason, the present invention provides a passage area control means that includes a thin film made of an elastic member attached to an opening provided in the peripheral wall of the passage so as to close the opening, and a reflection of the thin film. a pellet type thermostat which inflates the thin film into the passageway in a direction to close the passageway by means of a piston rod provided so as to be able to come into contact with the passage side surface; It consists of a separate pipe body that is detachably attached to other passages.

<Function> The operating state of the piston rod of the pellet type thermostat changes during and after warm-up operation, and based on this, the passage area of the auxiliary air passage is controlled by the thin film that expands and contracts.

<Example> Hereinafter, an example of the present invention will be described based on FIG. 1.

In FIG. 1, the passage area control means of the air regulator according to the present invention consists of an elastic member such as rubber that is attached to an opening 16 provided in the peripheral wall of an auxiliary air passage 15 that bypasses the throttle valve so as to close the opening 16. a pellet type thermostat 18 which bulges the thin film 17 into the passage 15 in a direction to close the passage 15 by means of a piston rod 18A provided so as to be able to contact the surface of the thin membrane 17 on the side opposite to the passage; It is made up of.

Here, the passage portion to which the thin film 17 is attached is constituted by a separate pipe body 19 that is detachably attached to another passage portion. This pipe body 19 is made of metal or resin, and a half circumferential portion opposite to the portion where the opening 16 is formed is fitted into a semi-cylindrical groove 20a formed in the pipe body mounting member 20 and fixedly attached.

A cylindrical thin film attachment member 21 that protrudes while narrowing inside the pipe body 19 is fixedly attached to the opening 16 . The thin film 17 is baked and fixed to the inner circumferential surface of the thin film attachment member 21 with its peripheral portion, and is set in advance in a bulged shape at a portion inside the pipe body 19.

On the other hand, the pellet type thermostat 18 is equipped with solid wax, rubber that is an elastic body, and a piston in its case 18B, and when the solid wax receives heat, it becomes a liquid and expands in volume, pressing the rubber. It has a structure that pushes out a piston. A thin film pressing member 22 is attached to the tip of the piston rod 18A of the pellet type thermostat 18. The thin film pressing body 22 is connected to the piston rod 1
It is formed in a shape that is long in the direction perpendicular to 8A and has a substantially semicircular cross section in the direction perpendicular to the longitudinal direction. Temperature sensing part 1 of pellet thermostat 18
Case 18B and piston rod 18 except 8a
Part A is a substantially cylindrical thermostat mounting member 2.
Supported within 3. The mounting member 23 is attached to the temperature sensing section 1
It has a mounting flange 23A extending in the direction perpendicular to the axis on the outer periphery of the end on the 8a side. Moreover, the mounting member 23
On the end face of the piston rod 18A side, there is a semi-cylindrical groove 23B whose axial direction coincides with the direction perpendicular to the axis.
is provided.

The pipe body mounting member 20 has a groove 20
Attach the end face of the opening side of a to the thermostat mounting member 2.
The thermostat mounting member 2 is connected to the end face of the piston rod 18A of
Fixedly attached to 3. In this case, the half circumferential portion of the pipe body 19 exposed from the pipe body mounting member 20 is
It is fitted into the groove 23B on the end face of the thermostat mounting member 23. Further, the thin film pressing body 22 of the piston rod 18A of the pellet type thermostat 18 comes into contact with the surface of the thin film 17 on the side opposite to the passage.

Such an air regulator includes the temperature sensing portion 18a.
The mounting flange 23A is fixed to the mounting portion using mounting screws (not shown) while the mounting flange 23A is inserted into a location where the cooling water temperature of the engine can be detected.

Next, the operation of the air regulator having such a configuration will be explained.

During warm-up operation, the wax in the pellet type thermostat 18 is still kept at a low temperature, so the piston rod 18A is not operated and the thin film 1
The inlet and outlet portions of the pipe body 19 communicate with each other via an opening between the passage side surface of the pipe body 7 and the inner circumferential surface of the pipe body 19 .

Therefore, a sufficient passage area of the communication portion between the inlet and the outlet is ensured, and the amount of bypass air is increased.

On the other hand, after warm-up, the wax becomes hotter as the engine's cooling water temperature rises, becomes a liquid, expands in volume, presses the rubber, and pushes out the piston. As a result, the piston rod 18A is operated and pushes the thin film 17, so that the thin film 17 is bulged into the pipe body 19 and pressed against the inner peripheral surface of the pipe body 19.
Therefore, the communication between the inlet and outlet of the pipe body 19 is cut off, and the supply of bypass air is stopped.

According to the air regulator having such a structure, the passage area control means is constituted by the thin film 17 made of an elastic member attached to the pipe body 19 and the pellet type thermostat 18. Therefore, although the thin film 17 is used, the pellet type thermostat 18 The passage area can be changed only by the expansion and contraction movement of the piston rod 18A, and there is no rotating part unlike the conventional air regulator configured to drive the shutter using bimetal, so the structure can be simplified compared to the conventional device.

In addition, since the passage portion to which the thin film 17 is attached is constructed from a separate pipe body 19 that is detachably attached to other passage parts, by replacing the pipe body 19, the characteristics of the air regulator can be changed externally. It can be easily done from

Incidentally, in the conventional device, since the passage is integrally formed inside the main body of the air regulator, the characteristics cannot be easily changed from the outside.

<Effects of the Invention> As explained above, according to the air regulator of the present invention, the passage area control means is configured such that the thin film made of an elastic member attached to the passage by the piston rod of the pellet type thermostat is moved in the direction of blocking the passage. Since it is configured to bulge into the passage, the area of the passage can be changed only by the expansion and contraction of the piston rod of the pellet type thermostat, and there is no rotating part unlike the air regulator, which uses a conventional bimetal to drive the shutter. The structure can be simplified compared to the device, and the passage portion to which the thin film is attached is composed of a separate pipe body that is detachably attached to other passage portions.
This has a great practical effect, with the advantage that the characteristics of the air regulator can be easily changed from the outside.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing an embodiment of the air regulator according to the present invention, where A is a front sectional view, B is a side view, C is a sectional view taken along the line A-A in A, and Fig. 2 is a front view of a conventional air regulator. FIG. 16...Opening, 17...Thin film, 18...Pellet type thermostat, 18A...Piston rod, 19...Pipe body.

Claims (1)

[Scope of utility model registration request] In an air regulator for an internal combustion engine, the passage area control means is installed in an opening provided in a peripheral wall of the passage so as to close the opening. A pellet type thermostat comprises a thin film made of an elastic member, and a piston rod provided in contact with the surface of the thin film on the side opposite to the passageway inflates the thin film into the passageway in a direction to close the passageway. An air regulator for an internal combustion engine, characterized in that the passage portion to which the thin film is attached is constituted by a separate pipe body that is detachably attached to another passage portion.