JPH1162634A - Warming valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce cost by reducing blank material for eliminating the necessity to grind the outer periphery of a valve element. SOLUTION: This invention is related to a warming valve wherein a cylindrical valve casing 18 is arranged in the mid way of an exhaust flow passage for the exhaust emission exhausted from an engine, and a valve element 13 is turnably supported in the valve casing 18, and warming is accelerated with the engine loaded with the exhaust flow passage closed by closing the valve element 13. In such a warming valve, the outer peripheral face 13b of the valve element 13 is orthogonal in relation to the plate face 13a of the valve element 13, and the valve element 13 can be punched by a press machine, and the valve element 13 becomes nearly perpendicular to the center line C3 of the valve casing 18 when the valve is opened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a warm-up valve for promoting warm-up by closing a discharge passage of exhaust gas discharged from an engine of an automobile or the like.

[0002]

2. Description of the Related Art FIG. 4 is a sectional view showing an example of a conventional warm-up valve, and FIG. 5 is a sectional view showing another warm-up valve. In these warm air valves, a butterfly type valve element 3 is attached to a rotating shaft 2 supported by a valve casing 1. The valve body 3 shown in FIG.
The outer peripheral surface 4 forms an angle of about 75 ° with the plate surface 5 of the valve body 3. The valve body 3 of the warm-up valve shown in FIG. 5 has a U-shaped groove 6 extending in a diametrical direction and a central bulging portion 7.

[0003]

In the case of the above-mentioned conventional warm-up valve, it is necessary to grind the outer peripheral surface 4 in the valve element 3 shown in FIG. 4, and in the valve element 3 shown in FIG. In addition, since the bulging portion 7 is provided, the amount of material required for material removal is large, and there is a problem that the cost is increased in any case.

The present invention has been made in view of the above-mentioned conventional drawbacks, and has as its object to eliminate the need for grinding the outer peripheral surface of a valve body, reduce the amount of material required for material removal, and reduce the cost. An object of the present invention is to provide a warm-up valve capable of reducing the temperature.

[0005]

SUMMARY OF THE INVENTION To achieve the above object, the present invention provides a tubular valve casing disposed in the exhaust gas discharge passage from an engine, and a rotating valve casing in the valve casing. A warm-up valve having a valve body movably supported, which closes the valve body to close the discharge passage and promotes warm air in a state where a load is applied to an engine. The surface is at a right angle, the valve body can be formed by press punching, and the valve body is substantially perpendicular to the center line of the valve casing when the valve is closed.

[0006]

Embodiments of the present invention will be described in detail with reference to the drawings. 1 is a partially cutaway side view showing a warm-up valve according to an embodiment of the present invention, FIG. 2 is a cross-sectional view showing only the warm-up valve body of FIG. 1, and FIG. 3 is a partially cut-away front view of FIG. The warm air valve 10 includes a warm air valve body 11 and a valve body 13 fixed to a rotating shaft 12.
2 (see FIG. 2), an actuator 24 for opening and closing operation is provided, and the actuator 24 is inclinedly mounted via a bracket 23, and the rotating shaft 12 is rotatably mounted on the valve casing 18 of the warm-up valve body 11. Supported.

The warm-up valve 10 has an outer peripheral surface 13b perpendicular to a plate surface 13a of the valve body 13, and the valve body 13 can be formed by press punching. The valve casing 18 is substantially perpendicular to the center line C3.

The warm-up valve 10 has a valve element 13 for warm-up disposed in a discharge flow path of exhaust gas discharged from the engine, and operates an output rod 45 of an actuator 24 to open and close the valve body 13. The valve body 13 is closed at the time of warm-up, and the exhaust passage is closed to promote warm-up while a load is applied to the engine. The actuator 24 is provided with a stud bolt 26 serving as a stopper protruding inside to restrict the position of the output rod 45 when the valve is opened.
When the valve is opened, the output rod 45 is stopped and positioned by the stud bolt 26 in a posture inclined with respect to the center line C1 of the housing 30, and the housing 30 of the actuator 24 is mounted on the valve casing 1 of the warm-up valve 10.
8 is arranged at an angle.

The warm-up valve 10 has an actuator 24 for opening and closing the valve 13 mounted on a valve casing 18 via a bracket 23. The valve 13 is
The lever 7, which is fixed to the rotating shaft 12 and is attached to the rotating shaft 12, is opened and closed by rotating the lever 7 by the movement of the output rod 45 of the actuator 24.

The valve body 13 is of a circular butterfly type, and has a U-shaped groove 14 formed in a diametrical direction.
4 has a valve plate portion 15 continuing on both sides, and a plurality of through holes 14a are formed in the U-groove portion 14;
Are fitted to the outer periphery of the rotating shaft 12, and a plurality of bolts 17 passed through the through holes 14 a are screwed into the screw holes 12 a of the rotating shaft 12 and are fixed to the rotating shaft 12. The valve 13 is
In the fully opened state, the valve plate portion 15 is substantially horizontal as shown by the solid line in FIG. 2, and in the fully closed state, the valve plate portion 15 is substantially vertical as shown by the two-dot chain line, and the operating angle range is 90 °. It has been.

The valve casing 18 has a central cylindrical body 19.
And bearing cylinder portions 20, 20 protruding along an extension of the diameter of the cylinder 19, and flanges 29, 29 at both ends of the cylinder 19.
And a small-diameter cylinder 21 disposed at four places around the cylindrical body 19, and a coupling cylinder 22 parallel to both sides of one of the bearing cylinders 20. It has a screw hole 22a.

The bracket 23 is connected to the valve casing 18.
The coupling board portion 27 facing the coupling cylindrical portion 22 of the first embodiment, and the inclined plate portion 2 inclined with respect to the valve casing 18 and the rotating shaft 12.
8 are integrally formed, a plurality of screw holes 34a are formed in a mounting plate 34 interposed between the inclined plate portion 28 and the housing 30, and stud bolts 25 and 26 are screwed into the screw holes 34a. The head 26a of one stud bolt 26 functions as a stopper.

The actuator 24 includes a plurality of bolts 36.
Bracket 2 fixed to valve casing 18 with
A diaphragm 41 in the housing 30, a diaphragm plate 42 and a retainer 43 sandwiching the diaphragm 41,
An output rod 45 is connected to the diaphragm 41, and a negative pressure source communicates with the negative pressure chamber 40 in the housing 30 via a negative pressure supply / discharge pipe 46 and a switching valve (not shown) in the middle thereof. Connected as possible.

The housing 30 is formed by combining a first shell 31 and a second shell 32, the center of which is above the center line C3 of the valve casing 18, and at least a part of which is located at the top of the valve casing 18. , And one end of the return spring 44 is received by the spring receiving surface 31a on the inner surface of the first shell 31, and the second shell 32 is attached to the bracket 23 by the stud bolts 25 and 26 to the center line C3 of the valve casing 18. On the other hand, it is mounted and supported in a state of being inclined at an inclination angle θ. The inclination angle θ is preferably 20 to 30 °.

The housing 30 includes the diaphragm 4
1 forms a negative pressure chamber 40 therein, and the first shell 3
A pipe (not shown) is connected to the negative pressure supply / discharge pipe 46 attached to the end face of the first shell 1, and the output rod 45 protrudes freely from the central through hole 32 a of the second shell 32.
The outer peripheral edge 41 of the diaphragm 41 is
a. A drain hole 47 is formed in the lowermost part of the second shell 32.

The diaphragm 41 has a center portion sandwiched between the diaphragm plate 42 and the retainer 43, and the head 45a and the neck 45b of the output rod 45 are connected via the diaphragm plate 42 and the retainer 43. The diaphragm plate 42 has a through hole 42a through which the output rod 45 penetrates in the center, forms an inner flange 42b by bending an outer peripheral portion inward, and retains the retainer 43 with a retaining portion 43 fitted to a neck 45b of the output rod 45. And a portion near the center of the diaphragm 41.

In the state shown in FIG. 1, when a negative pressure is supplied from a negative pressure source (not shown) such as a vacuum pump and the pressure in the negative pressure chamber 40 decreases, the diaphragm 41 resists the urging force of the return spring 44. As a result, the negative pressure chamber 40 is deformed so as to be reduced, and the output rod 45 is operated to enter. By this, the valve element 13 for warming is closed and the negative pressure is removed from the negative pressure chamber 40. 1 returns to the state shown in FIG. Thereby, the valve body 13 for warm air opens.

The output rod 45 is connected to the diaphragm 41 so as to be inclined with respect to the center line C1 of the housing 30, and when the retainer 43 contacts the head 26a of the stud bolt 26, the movement at the time of valve opening is restricted. Inclination angle α of center line C2 with respect to center line C1 of housing 30
Is set in the range of 5 to 15 °, and the inclination angle α is preferably set to about 10 °.

The output rod 45 is connected to the housing 30.
An outwardly protruding tip is pin-joined to the lever 7 with a pin 54, and the end 7a of the lever 7 abuts against a stopper bolt 38 attached to the bracket 23, thereby restricting the movement when the valve is closed. .

Next, the operation of the warm-up valve according to the embodiment of the present invention will be described. At the time of warm-up, when a warm-up switch (not shown) is turned on, a negative pressure is supplied to the negative pressure chamber 40 through the negative pressure supply / discharge pipe 46, the actuator 24 operates, the output rod 45 enters and operates to close the valve, and the lever 7 The end 7a of the contact member abuts against the stopper bolt 38 and stops. When the warm air is released, when the warm air switch is turned off, the negative pressure is discharged through the negative pressure supply / discharge pipe 46, and the retainer 4 is released.
The output rod 45 stops in a valve-open state when 3 hits the head 26a of the stud bolt 26. At this time, a downward force acts on the tip of the output rod 45, that is, the link mounting portion, with the contact point between the bolt 26 and the head 26a as a fulcrum due to the urging force of the return spring 44. Does not resonate with the vibration of.

In the warm air valve according to the above embodiment of the present invention, the return spring 4 is provided by the internal stopper structure in which the retainer 43 abuts against the stud bolt 26.
Since the biasing force of 4 is canceled there and no load is applied to the link system of the valve, it is possible to prevent the link system from resonating due to engine or road surface vibration and causing abnormal noise and wear. There is a need. Therefore, the output rod 45
At the time of opening the valve, the center line C1 of the housing 30 is attached with an inclination angle α at the center line C2, so that a force perpendicular to the center line C1 of the housing 30 is generated. It will not resonate even with external vibration.

Further, since the housing 30 is attached to the valve casing 18 at an inclination angle θ, even when the warm-up valve 10 is installed below the floor of the vehicle, interference with other parts can be avoided, and The center of the housing 30 is above the center line C3 of the valve casing 18 and a part of the housing 30 is
Since the drain hole 47 is formed above the uppermost portion and the lowermost portion is provided with the drainage hole, there is an advantage that water can be reliably drained without water remaining in the housing 30. Further, in the fully closed state, as shown by a two-dot chain line in FIG. 2, since the valve plate portion 15 is substantially vertical, there is an advantage that the valve body has a minimum area and the necessary amount of material can be minimized. is there.

Further, the small-diameter cylindrical portion 21 is integrally formed with the valve casing 18, and the flange 29 for attaching the valve casing 18 to the exhaust pipe is reinforced from a rib structure to a cylindrical structure with the small-diameter cylindrical portion 21. Since the stress of the flange 29 to be formed can be made a compressive stress instead of a bending stress, there is an advantage that the thickness can be reduced and the strength can be secured.

Note that the present invention is not limited to the above embodiment, and various modifications are possible. For example, the present invention can be applied to an actuator that operates at a positive pressure instead of the actuator 24 that operates at a negative pressure.

[0025]

According to the present invention, the outer peripheral surface is perpendicular to the plate surface of the valve body, and the valve body can be formed by press punching. When the valve is closed, the valve body is aligned with the center line of the valve casing. By having a substantially vertical posture, there is no need to grind the outer peripheral surface of the valve body, and there is an effect that the material can be reduced and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view showing a warm-up valve according to an embodiment of the present invention.

FIG. 2 is a sectional view showing only a warm-up valve main body of FIG. 1;

FIG. 3 is a partially cutaway front view of FIG. 1;

FIG. 4 is a cross-sectional view illustrating an example of a conventional warm-up valve.

FIG. 5 is a sectional view showing another conventional warm-up valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Warm air valve 11 Warm air valve main body 12 Rotating shaft 13 Valve body 13a Plate surface 13b Outer peripheral surface 14 U groove 15 Valve plate 18 Valve casing

Claims (1)

[Claims] 1. A valve body having a cylindrical valve casing disposed in a discharge passage of exhaust gas discharged from an engine, the valve body rotatably supported by the valve casing, and the valve body being closed. In a warm-up valve that promotes warm air in a state in which the exhaust passage is closed and a load is applied to an engine, an outer peripheral surface of the warm-up valve is perpendicular to a plate surface of the valve body, and the valve body is formed by press punching. A warm-up valve according to claim 1, wherein said valve body is substantially perpendicular to a center line of said valve casing when said valve casing is closed.