JPH08109839A - Exhaust gas control device for internal combustion engine - Google Patents

Abstract

PURPOSE: To relieve a load on an engine through prevention of a continuance of running of a vacuum pump being a working source for an actuator during operation of an exhaust control valve and to perform arbitrary adjustment of the opening of a valve. CONSTITUTION: An exhaust gas control device for an internal combustion engine comprises an exhaust gas control valve A having a valve body 7 normally energized in a closing direction; an actuator C to open a valve body 7; a stopper device B to hold the valve body 7 in an opening state through regulation of movement of the valve body 7 to a closing direction; and a valve opening adjusting means D to adjust the opening of the valve body 7 to an arbitrary value. The valve body 7 opened by the actuator C is held in an opening state by the stopper device B.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas control device for controlling the flow rate of exhaust gas by opening and closing an exhaust control valve such as an exhaust brake valve and an EGR valve provided in an exhaust pipe of an engine.

[0002]

2. Description of the Related Art Normally, the above-mentioned exhaust control valve is driven by
A mechanical actuator that uses vacuum pressure or compressed air pressure is used. That is, in order to fully open or fully close the valve body of the exhaust control valve from the normally closed or normally open position, vacuum pressure or compressed air pressure is applied to the actuator.

[0003]

A negative pressure tank or a high pressure air tank is generally used when the above-mentioned exhaust control valve is frequently operated or kept in an operating state for a certain period of time. However, it is difficult to mount a negative pressure tank or the like on a space-wise basis in a relatively small vehicle of a passenger car class.
Therefore, during operation of the exhaust control valve, it is necessary to constantly operate the vacuum pump, the compression pump, and the like that use the engine as a power source.

As a result, an extra load is applied to the engine, the horsepower loss is increased, and the output is lowered and the fuel consumption is deteriorated. Further, with the conventional one, it is difficult to adjust the valve body of the exhaust control valve to an arbitrary opening degree.

The present invention has been made in order to solve the above problems, and avoids continuing to operate the vacuum pump or the like which is the operation source of the actuator during the operation of the exhaust control valve, so that An object of the present invention is to provide an exhaust gas control device for an internal combustion engine, which is capable of reducing the load and adjusting the opening of the valve discretionarily.

[0006]

According to the present invention, the above problems can be solved as follows. (1) Between the exhaust control valve and the actuator, an exhaust control valve that is provided in the exhaust pipe line of the engine and has a valve body that is always urged in the valve closing direction, an actuator that opens the valve body, A stopper device, which is provided and holds the valve body in the valve open state by restricting the movement of the valve body in the closing direction, and is provided between the actuator and the stopper device to open the valve body at an arbitrary opening degree. And a valve opening adjusting means for adjusting the valve opening.

(2) In the above item (1), the stopper device is provided with a holder having a tapered hole that gradually expands outward, and the stopper hole penetrates the tapered hole so as to be movable in the axial direction. A lock shaft linked to the actuator at one end protruding in the radial direction and the other end to the valve body, a plurality of steel balls housed in a tapered hole around the lock shaft, and the steel balls constantly taper An elastic member that presses the hole in the radial direction, a solenoid provided in the holder, and a pressing member that moves the steel ball in the radial direction of the tapered hole by the operation of the solenoid are provided.

(3) In the above item (1) or (2), the valve opening adjusting means is provided at a connecting portion between the lock shaft and the drive rod of the actuator, and a male screw having spiral directions opposite to each other, It shall consist of a connecting tube screwed to them.

[0009]

According to the present invention, since the valve body of the exhaust control valve which is opened by the actuator is held in the open state by the stopper device, it is not necessary to continue operating the actuator, and therefore the actuation source of the actuator is required. The negative pressure pump, the compression pump, and the like can be stopped immediately after the valve is opened. The opening degree of the valve body can be easily adjusted by operating the valve opening adjusting means.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the device of the present invention mainly includes an exhaust control valve (A), a stopper device (B), and a negative pressure type actuator (C).

In the body (1) of the exhaust control valve (A), an exhaust gas inlet (2) which faces vertically and a discharge port (3) which faces sideways are formed in communication with each other. ing. A flange (4) is provided at each opening end of the inlet (2) and the outlet (3).
Are integrally formed, and a plurality of stud bolts (5) are screwed into the flange (4) on the inlet (2) side.

A cylindrical valve seat (6) is press-fitted into the inlet (2). On the axis of the valve seat (6) of the body (1), the shaft portion (7b) of the valve body (7) having the umbrella portion (7a) at the lower end penetrates, and the umbrella portion (7a) is Abutment with seat (6), inlet
(2) is designed to be sealed.

A horizontal mounting seat (1a) at the upper end of the body (1)
A cylindrical case (8) having a downward opening is bolted to the shaft, and the shaft portion (7b) of the valve body (7) penetrates through the case (8) and projects upward.

The shaft portion (7b) in the case (8) has a spring bearing.
(9) is fitted and abuts against the enlarged diameter stepped portion (7c) formed on the shaft portion (7b), thereby preventing the downward movement. Between the spring receiver (9) and the inner bottom surface of the case (8), a compression coil spring (10) for constantly urging the valve body (7) downward is contracted.

A support cylinder (11) having a substantially truncated cone shape is fixed upward on the outer peripheral surface of the case (8), and the top wall thereof has
A hollow connector bolt (13) attached to one end of a flexible outer case (12) is screwed so that the vertical position can be adjusted.

A flexible control cable (14) is inserted into the outer case (12), and one end protruding into the support cylinder (11) has a shaft portion (7b) of the valve body (7). ) At the end of
It is connected through a U-shaped fitting (15). The other end of the control cable (14) is connected to the stopper device described later.
It is linked to the lock shaft (25) of (B).

As shown in the enlarged view of FIG. 2, the stopper device (B) has a tapered hole (1) whose diameter gradually increases upward in the center.
Holder (16) with 6a) and recessed hole in the lower half of the holder (16)
Solenoid (17) housed in (16b) and taper hole (16a)
And a cylindrical ball holder (18) fitted in the solenoid (17) so as to be movable up and down, and steels housed in a plurality of holding holes (18a) facing the radial direction at the upper end of the ball holder (18). Sphere (19)
And the spring bearing (20) that abuts the upper surface of the ball holder (18).
And a compression coil spring (22) compressed between the lower surface of the upper plate (21) closing the upper end of the tapered hole (16a) and the bottom plate closing the recessed hole (16b) of the lower surface of the holder (16). (23) and the lower surface of the solenoid (17), the holder (16), the ball holder (16), the pressing plate (24) which is housed in contact with the lower end of the ball holder (18).
(18), spring bearing (20), top plate (21), bottom plate (23) and pressing plate (2
4) and a lock shaft (25) penetrating the same so as to be vertically slidable.

Lock shaft (2 in taper hole (16a)
Around the 5), wedge-shaped gap with a narrower width on the lower side.
(S) is formed, and the steel ball (19) is formed on the inner peripheral surface of the tapered hole (16a) and the outer peripheral surface of the lock shaft (25) in the gap (S) by the urging force of the compression coil spring (22). Always in contact.
The inclination angle of the tapered hole (16a) is preferably about 5.5 °.

The upper plate (21) and the bottom plate (23) are fixed to the holder (16) by a plurality of bolts (26) inserted into the holder (16). The stopper device (B) is fixed vertically to the inside of the bracket (28) by bolting the bottom plate (23) to a frame-shaped bracket (28) bolted to a stationary member (27) of the vehicle. It is fixed.

The other end of the outer case (12) is locked below the bracket (28) by an inverted L-shaped bracket (30) bolted to the immovable member (27), and the outer case
The upper end of the control cable (14) protruding upward from the (12) has a U-shaped connecting tool (31) at the upper end of the lock shaft.
It is connected to the lower end of (25).

The casing (32) of the actuator (C) is
It has a two-part structure in which the middle portion is joined by a seal rubber (33), and the lower surface is bolted to the upper surface of the bracket (28) so as to be coaxial with the stopper device (B).

A cup-shaped spring receiver (34) is housed in the casing (32) so as to be movable up and down, and the spring receiver (34) is compressed between an upper surface of its inner part and a lower surface of the casing (32). It is always urged downward by the provided compression coil spring (35).

In the casing (32), the outer peripheral end is fixed to the lower end of the seal rubber (33), and the inner peripheral end is fixed to the lower surface of the spring receiver (34) with the holding plate (36), respectively.
It is divided into two rooms, upper and lower, by (37).

(38) is a drive rod coaxial with the lock shaft (25), the upper end of which penetrates the spring receiver (34) and is fixed to the nut (39), and the lower end of which is The bottom wall of the casing (32) slidably penetrates and projects downward.

A small-diameter screw shaft (40) continuously provided at the lower end of the drive rod (38) is connected to a male screw (25a) formed at the upper end of the lock shaft (25) by a connecting cylinder (41). Has been done.

The screw formed on the screw shaft (40) is a male screw (2
There is a reverse screw with the direction of the spiral opposite to 5a),
In the connecting cylinder (41), the screw shaft (40) and the male screw (25a)
A female screw hole (not shown) into which is screwed is formed over the upper and lower half lengths.

The male screw (25a), screw shaft (40) and connecting cylinder
The valve opening adjusting means (D) is constituted by (41).

When the connecting cylinder (41) is rotated, the lock shaft (25) and the drive rod (38) move relative to each other in the axial direction, and the moving stroke of the lock shaft (25) is adjusted. (42) is a lock nut.

Next, the operation of the above embodiment will be described. When the upper chamber in the casing (32) of the actuator (C) is decompressed by a vacuum pump (not shown) driven by the engine via the connection pipe (43), the spring bearing
(34) and the drive rod (38) connected thereto are pulled upward against the compression coil spring (35). At this time, the solenoid (17) in the stopper device (B) is turned off.
I will keep it.

When the drive rod (38) is pulled upward, the lock shaft (25) connected to the drive rod (38) moves upward, pulls the control cable (14), and the valve body () of the exhaust control valve (A) ( 7) is pulled up to the upper limit position shown in FIG. 1 and fully opened.

As a result, the exhaust gas flows from the inflow port (2) side to the exhaust port (3) side, and the exhaust control valve (A) is passed through, for example, EGR.
When used as a valve, it is returned to the intake system of the engine.

When the vacuum pressure acting on the vacuum actuator (C) is released while the valve body (7) is open, the drive rod (38) and the lock shaft (25) move to the exhaust control valve.
The spring force of the compression coil springs (10) and (35) of (A) and the actuator (C) tends to pull it down.

However, at this time, since the plurality of steel balls (19) in the stopper device (B) slightly roll in the wedge-shaped gap (S) toward the narrow width side and bite, the lock shaft (2
5) is prevented from moving downward.

Therefore, even when the valve body (7) is kept open for a relatively long time, it is not necessary to keep the vacuum pressure applied to the vacuum actuator (C), and a negative pressure generating source such as a vacuum pump is used. It can be deactivated. As a result, the load on the engine is reduced, and deterioration of output, fuel consumption, etc. is prevented.

When closing the valve body (7), a stopper device is used.
The solenoid (17) of (B) is energized to magnetize it. Then, as shown by the imaginary line in FIG. 2, the pressing plate (24) is attracted to the solenoid (17) side, and the ball holder (18) and the steel ball (19) held by this are pushed up.

As a result, a gap is formed between the steel ball (19), the tapered hole (16a) and the lock shaft (25), and the lock shaft (25) can move downward. As a result, the valve body (7) is pushed down by the compression coil spring (10) and automatically closes. Although the above description is for the case where the valve body (7) is fully opened, it is also possible to open the valve to any position when reducing the flow rate of the exhaust gas.

At this time, the connecting cylinder (41) is rotated to separate the relative distance between the lock shaft (25) and the drive rod (38), and when the drive rod (38) is pulled up to the upper limit. The amount of upward movement of the lock shaft (25) may be smaller than the maximum amount of movement of the valve body (7).

The present invention is not limited to the above embodiment. For example, the actuator (C) may be an actuator using compressed air. At this time, as shown in FIG. 1, compressed air may be supplied from an air vent hole (44) formed in the lower outer peripheral wall of the casing (32) of the actuator (C).

In the stopper device (B), the ball holder
The (18) and the pressing plate (24) may have an integrated structure, and this may be used as the pressing member. The present invention is also applied to the above-mentioned push-close type exhaust control valve (A) that pushes and closes the valve body (7), as well as those that include a pull-close type exhaust control valve that pulls and closes the valve body. sell.

[0040]

According to the present invention, the following effects can be obtained. (a) Since the opened valve body is held in the opened state by the stopper device, the operation of the actuator is limited to a very short time. Therefore, the operation source of the actuator such as the vacuum pump is continuously driven for a long time. There is no need, and the load on the engine is reduced, and the reduction in output and fuel consumption is prevented.

(B) The opening degree of the valve element can be easily adjusted by operating the valve opening adjusting means provided between the actuator and the stopper device.

(C) When the stopper device according to the second aspect is used, the valve body can be locked and unlocked easily and surely by simply turning the solenoid on and off, and the lock position can be set continuously. sell.

[Brief description of drawings]

FIG. 1 is a central longitudinal front view showing an embodiment of the present invention.

FIG. 2 is an enlarged vertical sectional view of a main part of a stopper device.

[Explanation of symbols]

 (1) Body (2) Inlet (3) Outlet (4) Flange (5) Implant bolt (6) Valve seat (7) Valve body (7a) Umbrella part (7b) Shaft part (8) Case (9) ) Spring holder (10) Compression coil spring (11) Support tube (12) Outer case (13) Connector bolt (14) Control cable (15) Fixture (16) Holder (16a) Tapered hole (16b) Recessed hole (17) ) Solenoid (18) Ball holder (18a) Holding hole (19) Steel ball (20) Spring bearing (21) Upper plate (22) Compression coil spring (23) Bottom plate (24) Press plate (25) Lock shaft (25a) Male screw (26) Bolt (27) Fixed member (28) Bracket (29) Bolt (30) Bracket (31) Connector (32) Casing (33) Seal rubber (34) Spring bearing (35) Compression coil spring (36) Presser foot Plate (37) Diaphragm (38) Drive rod (39) Nut (40) Screw shaft (41) Connecting cylinder (42) Lock nut (43) Connection pipe (44) Air vent hole (A) Exhaust control valve (B) Stopper Device (C) Actuator (D) Valve opening adjustment means (S) Gap

Claims (3)

[Claims] 1. An exhaust control valve which is provided in an exhaust pipe of an engine and has a valve body which is always biased in a valve closing direction; an actuator which opens the valve body; and an exhaust control valve and an actuator. A stopper device that is provided between the actuator and the stopper device that holds the valve body in the open state by restricting the movement of the valve body in the closing direction, and is provided between the actuator and the stopper device.
An exhaust gas control device for an internal combustion engine, comprising: a valve opening adjusting means for adjusting a valve opening to an arbitrary opening. 2. A holder having a taper hole whose diameter gradually expands outward, and one end which penetrates the taper hole so as to be movable in the axial direction and which protrudes in the diameter expansion direction of the taper hole. A lock shaft linked to the actuator and the other end to the valve body, a plurality of steel balls housed in a tapered hole around the lock shaft, and the steel balls are constantly pressed in the diameter reducing direction of the tapered hole. The exhaust gas control of an internal combustion engine according to claim 1, further comprising: an elastic member, a solenoid provided in the holder, and a pressing member that moves the steel ball in a diameter-expanding direction of the taper hole by operating the solenoid. apparatus. 3. A valve opening adjusting means comprising a male screw provided in a linking portion between a lock shaft and a drive rod of an actuator and having spiral directions opposite to each other, and a connecting cylinder screwed with the male screw. 3. An exhaust gas control device for an internal combustion engine according to claim 1 or 2.