JP2600188Y2 - Auxiliary air regulating valve for engine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an auxiliary air regulating valve provided in an auxiliary air passage which bypasses a main air passage to a cylinder provided with a throttle valve which opens and closes by operating an accelerator pedal of an automobile engine. It is.

[0002]

2. Description of the Related Art As shown in FIG. 3, a recent automobile engine has a main air passage 11 in addition to a main air passage 11 to a cylinder provided with a throttle valve 10 which is opened and closed by operating an accelerator pedal. An auxiliary air passage 12 bypassing the air passage 11 is provided, and the auxiliary air passage 12 is provided with an auxiliary air adjustment valve 13 that is automatically opened and closed according to the temperature.

In the case of an electronically controlled fuel injection engine,
A further auxiliary air passage 14 bypassing the main air passage 11 to the cylinder is provided. The auxiliary air passage 14 is provided in the auxiliary air passage 14 according to various conditions of the engine, that is, whether or not the air conditioner is loaded. A solenoid valve 15 for controlling the opening and closing of the valve by a solenoid or the like is provided. Reference numeral 16 denotes an injector that supplies an appropriate air-fuel mixture required by the engine instead of the carburetor.

In the above-described electronically controlled fuel injection engine, when the engine is started or when the outside air temperature is low, the auxiliary air regulating valve 13 provided in the auxiliary air passage 12 is opened to increase the amount of air taken into the cylinder. It improves the startability of the engine.

When the required time elapses and the engine coolant temperature rises, the auxiliary air regulating valve 13 closes, and the engine speed is controlled by the throttle valve 10 and the solenoid valve 15.

FIG. 4 is a longitudinal sectional view showing a conventional auxiliary air regulating valve 13. Reference numeral 17 denotes a casing formed by casting or the like. One end of the casing is provided with cooling water communicating with engine cooling water through a pipe 18. A passage 19 is formed, and an expansion body 20 a that expands and contracts with temperature so as to be immersed in the cooling water passage 19.
Temperature-sensitive element 2 provided with a container 20b in which
0 is provided.

The temperature-sensitive element 20 is constituted by the following members. That is, 20 c is the expansion body 20.
a is a movable plate (diaphragm) such as a rubber plate sealed in a container 20b, and 20d is a cavity 20e separated by a movable plate 20c.
The semi-fluid 20f is placed in a sliding hole 20g so as to be pushed by the semi-fluid 20d.
0h is a disk attached to the piston 20f,
The temperature-sensitive element 20 is constituted by the above members.

Reference numeral 21 denotes a sliding shaft provided with the base end in contact with the disk 20h and slidably provided in the sliding hole 20g. The base end of the valve shaft 22 is inserted into a concave hole at the front end thereof. The valve 23 is attached to the tip of the valve shaft 22.

Reference numeral 24 denotes a retainer (holding member) slidably fitted to a protruding portion 20i formed at the distal end of the temperature-sensitive element 20, and the retainer 24 holds the base end of the valve shaft 22. And this retainer 2
A valve spring 25 is provided between the valve 4 and the valve 23, and a return spring 27 is provided between the retainer 24 and a valve body 26 having an air hole 26a opened and closed by the valve 23.

The valve body 26 is attached to an opening 17a communicating with one of the auxiliary air passages 12 of the housing 17 by screwing or the like, and a lid 28 is attached to the opening 17a. A pipe 29 communicating with one of the air passages 12 is attached. Auxiliary air flows in through the pipe 29, passes through a ventilation hole 26 a formed in the valve body 26, and to the other side of the auxiliary air passage 12 of the housing 17. Auxiliary air is configured to flow out to the cylinder via a pipe 30 provided in the communicating opening 17b.

In general, when the engine is started or when the temperature of the outside air is low, the auxiliary air regulating valve 13 which is provided in the auxiliary air passage 12 and is automatically opened and closed according to the temperature is opened to open the engine. The amount of air is increased to improve startability. The auxiliary air regulating valve 1
A part of the engine cooling water is circulated around the auxiliary air passage 12 provided with 3 to prevent icing.

The reason for circulating the engine cooling water is as follows. (1) Only when the temperature of the engine cooling water is low, it is desired to increase the amount of air flowing through the auxiliary air passage 12. In order to make the expansion body 20a constituting the temperature element 20 sense the temperature of the engine cooling water. (2) The casing 17 of the auxiliary air regulating valve 13 is formed so that the container 20b of the expansion body 20a constituting the temperature sensing element 20 which is the temperature sensitive member of the auxiliary air regulating valve 13 is immersed in engine cooling water. By passing the engine cooling water through the cooling water passage 19, the heat of the engine cooling water is transmitted to the valve element 26 of the auxiliary air regulating valve 13, so that icing (icing) between the valve element 26 and the valve 23 can be prevented. it can.

When the temperature of the atmosphere is low and immediately after the start of the engine, the temperature of the engine cooling water is low. The contraction of the expansion body 20a constituting the temperature sensing element 20 for detecting the low temperature causes the sliding shaft 21 and the valve. Shaft 22
Through the vent hole 26a formed in the valve body 26
Is opened to increase the amount of air flowing to the cylinder through the auxiliary air passage 12, and when the temperature of the engine cooling water rises, the expansion body 20 a expands and passes through the sliding shaft 21 and the valve shaft 22. The valve 23 closes the ventilation hole 26a formed in the valve body 26.

[0014]

The above-mentioned conventional auxiliary air regulating valve has an increased weight, a large number of cutting parts and a large number of parts, because the housing 17 is made of metal. Will be higher. Further, since the number of parts is large, even if the dimensional accuracy of the parts is improved, the accumulated tolerance becomes large, so that there has been a problem that it is difficult to finely control the flow rate. The purpose of the present invention is to provide an auxiliary air regulating valve that solves the above-mentioned problems.

[0015]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides an auxiliary air passage which bypasses a main air passage to a cylinder provided with a throttle valve which is opened and closed by operating an accelerator pedal. An auxiliary air adjustment valve, a temperature sensing member 2 disposed in a cooling water passage 1 communicating with the engine cooling water, a valve shaft 3 for transmitting expansion and contraction of the temperature sensing member 2, and a valve shaft 3; A valve shaft support member 4 slidably supported and having an auxiliary air flow window 4a formed therein, and a valve provided at the tip of the valve shaft 3 for opening and closing the auxiliary air flow window 4a formed in the valve shaft support member 4 5 and an auxiliary air flow window formed in the valve shaft supporting member 4 while forming the cooling water passage 1 surrounding the assembly of these members. It casing formed of a synthetic resin forming the inlet 6a and outlet 6b communicating with the auxiliary air passage a
And the cooling unit formed in the housing 6.
The temperature-sensing member 2 provided in the water passage 1 senses temperature.
As a result, the auxiliary hollow formed in the valve shaft
The air flow window 4a is opened and closed by the valve 5 to open the auxiliary air flow.
It controls the flow rate of the auxiliary air flowing through the road .

[0016]

The present invention is constructed as described above,
When the temperature of the atmosphere is low and immediately after the start of the engine, the temperature of the engine cooling water is low.
Contracts, and this contraction is transmitted to the valve shaft 3,
The valve 5 attached to the tip moves so as to open the auxiliary air flow window 4a formed in the valve shaft support member 4,
The amount of air flowing into the cylinder is increased, the startability of the engine is improved as described above, and the engine speed is increased. This state is a so-called warm-up operation.

When the engine is warmed up for a predetermined time (2 to 3 minutes), the temperature of the engine cooling water rises, and the temperature-sensitive member 2 expands. The valve 5 mounted on the valve shaft moves so as to close the auxiliary air flow window 4a formed on the valve shaft support member 4, reduces the amount of air flowing into the cylinder, and ejects the air-fuel mixture from the injector so that the air-fuel mixture is near the stoichiometric air-fuel ratio. It is controlled so that the amount of fuel to be consumed is reduced. During the warm-up operation, the temperature of the engine coolant rises relatively quickly because the thermostat valve is closed so that the engine coolant does not flow to the radiator.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the auxiliary air regulating valve of the engine of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of the engine of the present invention in a state where the auxiliary air regulating valve is open, and FIG. 2 is a cross-sectional view of the same in a closed state.

In these figures, 1 is a cooling water passage communicating with engine cooling water, 2 is a temperature sensing member arranged in the cooling water passage 1, and 3 is a valve for transmitting expansion and contraction of the temperature sensing member 2. The shaft 4 supports the valve shaft 3 slidably and a valve shaft support member having an auxiliary air flow window 4a. The auxiliary shaft 5 is provided at the distal end of the valve shaft 3 and formed on the valve shaft support member 4. valve for opening and closing the air flow windows 4a, 6, said as to form the cooling water passage 1 surrounds the assembly of the members, the inlet 6a and outlet of said auxiliary air passage is communicated to the auxiliary air flow window 4a in is formed the synthetic resin forming 6b
Housing .

Reference numeral 7 denotes a spring which is provided with one end pressed against the tip of the valve 5 and pushes back the valve 5 so that the auxiliary air flow window 4a is opened. The other end is formed of synthetic resin .
It is pressed against the inner surface of a lid 8 made of, for example, a synthetic resin that is adhered or welded to the opening 6c of the formed housing 6 and sealed.

The temperature sensing member 2 is formed as described below. That is, reference numeral 2a denotes a container attached to one end of the valve shaft support member 4 and disposed in the cooling water passage 1, and an expansion member 2b which expands and contracts thermally is accommodated in the container 2a. Reference numeral 2c denotes a movable plate (diaphragm) such as a rubber plate in which the expansion body 2b is sealed in the container 2a. Reference numeral 2d denotes a semi-fluid placed in the cavity 2e separated by the movable plate 2c. The piston 2h slidably provided in the sliding hole 2g communicating with the cavity 2e so as to be moved is a disk attached to the piston 2f. 2 are configured.

The proximal end of the valve shaft 3 having the valve 5 attached to the distal end is connected to the disk 2h on the piston 2f.
, And is slidably inserted into the sliding hole 2g formed in the valve shaft support member 4 to support the valve shaft 3.

Since the auxiliary air regulating valve of the engine according to the present invention is constructed as described above, as shown in FIG.
The temperature of the engine cooling water is low, the temperature-sensitive member 2 contracts due to the low temperature, and the contraction is transmitted to the valve shaft 3, and the valve 5 attached to the tip end of the valve shaft 3 forms the auxiliary member formed on the valve shaft support member 4. It moves to open the air flow window 4a, increases the amount of air flowing into the cylinder, improves the startability of the engine as described above, and increases the engine speed. This state is a so-called warm-up operation.

As shown in FIG. 2, when the engine is warmed up for a predetermined time, the temperature of the engine cooling water rises, the temperature-sensitive member 2 expands, and this expansion is transmitted to the valve shaft 3, An auxiliary air flow window 4a formed in the valve shaft support member 4 is provided with a valve 5 attached to the tip end thereof.
Is closed and the amount of air flowing into the cylinder is cut.

[0025]

[Effects of the Invention] This invention is based on the fact that the auxiliary air regulating valve of the engine as described above is used.
Throttle bar that opens and closes by operating the accelerator pedal
To bypass the main air passage to the cylinder where the lube is located
An auxiliary air adjustment valve provided in the auxiliary air passage, the temperature-sensitive member disposed in a cooling water passage communicating with the engine cooling water, a valve shaft for transmitting expansion and contraction of the temperature-sensitive member, and a valve shaft. A valve shaft support member slidably supported and forming an auxiliary air flow window,
A valve provided at a distal end portion of the valve shaft for opening and closing an auxiliary air flow window formed in the valve shaft support member; and forming the cooling water passage surrounding an assembly of these members and supporting the valve shaft support. from the formed synthetic resin for forming the inlet and outlet communicating with the auxiliary air passage to the auxiliary air flow windows formed in the member and the housing
And formed in the casing and disposed in the cooling water passage.
The temperature sensing member senses the temperature, and the valve
The auxiliary air flow window formed in the shaft support member is
Of auxiliary air flowing through the auxiliary air passage by opening and closing
By performing the control , the weight is reduced, the number of the cut portions and the number of parts are reduced, and the manufacturing cost is reduced. Further, since the number of components of the flow control unit for the auxiliary air flowing through the inlet and the outlet of the auxiliary air passage can be reduced, the variation in the amount of the auxiliary air with respect to the temperature can be reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of the engine of the present invention in a state where an auxiliary air regulating valve is opened.

FIG. 2 is a sectional view showing a state in which an auxiliary air regulating valve of the engine of the present invention is closed.

FIG. 3 is a schematic view showing a main air passage and an auxiliary air passage to a cylinder of a conventional general automobile engine.

FIG. 4 is a longitudinal sectional view showing a conventional auxiliary air regulating valve.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Cooling water passage 2 Temperature sensing member 2a Container 2b Expanding body which thermally expands / contracts 2c Movable plate 2d Semi-fluid 2e Cavity 2f Piston 2g Sliding hole 2h Disk 3 Valve shaft 4 Valve shaft support member 4a Auxiliary air flow window 5 Valve 6 Housing 6a Inlet of auxiliary air passage 6b Outlet of auxiliary air passage 6c Opening 7 Spring 8 Lid

Claims (1)

(57) [Scope of request for utility model registration] An auxiliary air regulating valve provided in an auxiliary air passage that bypasses a main air passage to a cylinder in which a throttle valve that opens and closes by operation of an accelerator pedal is provided, wherein the cooling water communicates with engine cooling water. A temperature-sensitive member disposed in the passage, a valve shaft for transmitting expansion and contraction of the temperature-sensitive member, a valve shaft supporting member slidably supporting the valve shaft and forming an auxiliary air flow window, A valve provided at the tip of the valve shaft for opening and closing an auxiliary air flow window formed in the valve shaft support member, and forming the cooling water passage surrounding the assembly of these members, and the valve shaft support member and forming the auxiliary air flow and communicates with the window said auxiliary air passage inlet and a housing formed of a synthetic resin forming the outlet
And formed in the casing and in the cooling water passage.
When the temperature sensing member provided senses temperature, the
The auxiliary air flow window formed in the lube shaft support member is
The auxiliary air flowing through the auxiliary air passage opened and closed by a valve
An auxiliary air adjustment valve for an engine, which performs flow control .