JPH029914A - Supercharge pressure control valve device - Google Patents

Abstract

PURPOSE:To suppress the self excited vibration of a valve and improve the responsiveness of the valve by forming a dynamic pressure increasing part for increasing the dynamic pressure of a supercharger in the case when the supercharger in an intake passage is released by the opening of the valve, at least either on the valve or a valve seat part. CONSTITUTION:A supercharge pressure control valve device 9 is interposed in a bypass passage 8 which makes a detour around a supercharger 3 and controls the supercharge pressure of the second intake passage 5 by the opening/closing operation. In the interme diate or high loading operation of a vehicle, the second and third intake passages 5 and 7 are maintained in high a positive pressure states by the supercharge action of the supercharger 3, and since also the first and second pressure chambers 19 and 29 are applied with each positive pressure, a force in the valve closing direction due to a spring 28 acts onto a diaphragm 17, and a valve 33 is closed. In this case, a recessed part 32 is formed on the periphery of a valve seat part 31, and a projecting part 34 is formed on the peripheral edge part of the valve 33, and a dynamic pressure increasing part is formed, and when the valve 33 is opened the dynamic pressure applied into the valve 33 is increased, and the self excited vibration of the valve 33 is suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a supercharging pressure control relief valve device that suppresses abnormal pressure rise in the intake passage on the upstream side of the throat valve that occurs during deceleration.

[Technology from b″C]

Fig. 2 shows a supercharging pressure regulating valve system for an internal combustion engine, which the present applicant has already applied for;
(1) is the air cleaner that serves as the air intake part, (2) is the intake air from the air cleaner (1) (hereinafter referred to as "intake")
(3) is the supercharger attached to the intake pipe (2), (4) is the first intake pipe that is the upstream side of the supercharger (3) in the intake pipe (2) , (5) is also a supercharger (3)
(6) is the throttle valve that controls the intake air amount, and (7) is the third intake pipe (2) that indicates the downstream side of the throat valve (6). Intake path, (8)
is the bypass passage b'a that communicates the first and second intake passages <4) and (5), and the opening/closing control of the bypass passage (<8) is controlled by the supercharging of the second intake passage (5) This is a supercharging pressure control valve device that controls pressure.

Hereinafter, the 31 side will be explained. 10) is a cylindrical housing, and (11) is a second passage formed inside the wall of the housing (10) for extracting the pressure of the second intake passage (5). , (13) is a flange that is the lower end of the housing (10), and is a flange that is the lower end of the housing (10), and is an intake pipe (2
) is attached to the first part (14).

(15) is the valve seat showing the opening and periphery of the upper end of the inner circumferential side of the flange (14), (16) is the nipple that serves as the inlet/outlet of the intake air, (]+7 is the top end circumference I of the housing (10), and (19) is a disc-shaped diaphragm whose peripheral edge is sandwiched between the bottomed cylindrical case (18) and the top end peripheral edge of the bottomed cylindrical case (18); The first pressure chamber (20) is connected to a pressure extraction boat (20) in order to guide the pressure of the third intake path (7) to the first pressure chamber (19).
1) and a first passage communicating through the nipple (22), (23a) and (231+) are respectively dish-shaped holders that hold the center part of the diaphragm (17), and (24)
The rod (25) has one end attached to the center of the holders (23a) and (23b), and the rod (25) is attached to the other end of the rod (24) and is provided so as to abut the valve seat (15). A disc-shaped valve (26) that opens and closes the passageway (8).
(27) is a bearing that slidably supports the rod (24);
is a bearing holder that holds the bearing (20), and (28) is a spring that is compressed between the case (18) and the holder (23a) and serves as an elastic member that biases the diaphragm and (+7) in the direction of the U1 valve. , (29) is formed between the diaphragm (17) and the bearing;
), a second pressure chamber (30
) is provided in the second passage (11), and the second passage (11)
Pressure no Den 3J! This is an aperture that acts as ventilation resistance to give a time delay to the speed.

Next, the operation of the supercharging pressure υ control valve system 6 configured as described above will be explained. During medium and high-load driving mode fFA of a car, the throttle valve (6) is fully open! Also, due to the supercharging effect of the supercharger (3), the second and third
Both the intake passages (5) and (7) are in a high positive pressure state, and the first
Since the same positive pressure is applied inside the pressure chamber (19) and the second pressure chamber (29), the diaphragm (17) is subjected to a force r- in the opening direction of the valve (25) by the spring (28). operates, and the valve (25) is in a fully open state.

Then, the throttle f from the above medium and high load operation core
When P (6) changes to deceleration operation where the valve suddenly closes, the pressure in the third intake passage (7) changes to a high pressure of 11, and the pressure in the first pressure chamber (19) increases.
becomes a high negative pressure, and the supercharging pressure in the second intake passage (5) increases to a level higher than that during supercharging operation, resulting in a high positive pressure, and this pressure passes through the second passage (11) to the second pressure chamber (29). ) and the valve (
25) is the spring (28) riIl! The valve opens against the power, and abnormal pressure increase on the upstream side of throttle: fP(6) is prevented.

By the way, when the air passes through the second passage (11), the throttle (3
0) and a delay in pressure transmission occurs, so the pressure in the second pressure chamber (29) changes over time. As a result, the valve 25) opens and the supercharging air leaks from the bypass passage (8), at the same time the supercharging pressure suddenly changes, and the pressure that was being applied to the lower surface of the diaphragm (17) during this period also synchronizes. When the valve (25) opens and closes, the pressure of the supercharging air rises again and the valve (25) reopens, repeating the opening and closing operation in a high-speed cycle, and the valve (25) increases the pressure. Self-excited vibration due to fluctuation! There are no inconveniences such as burning or making strange noises.

[Problem to be solved by the invention]

In the conventional supercharging pressure control valve device configured as described above, the self-excited vibration of the valve (25) is suppressed by providing the throttle (30) in the second passage (11). There is a delay in the transmission of the boost pressure transmitted to the chamber (29), the response of the valve (25) is slow, and the second upstream side of the throttle valve (6)
In order to further reduce the pressure rise in the intake passage (5), further improvement of this responsiveness has become a problem.

The present invention has been made to solve these problems, and aims to provide a supercharging pressure control valve device that suppresses the self-excited vibration of the valve as before and has excellent valve responsiveness.

[Means to solve the problem]

In the supercharging pressure control valve device according to the present invention, supercharging air in the second intake passage is supplied to at least one of the valve and the valve seat portion on which the valve is seated. A dynamic pressure increasing portion is formed to increase the dynamic pressure of the engine.

[Effect]

In this invention, the throttle valve closes suddenly. During rapid deceleration operation, the high positive pressure in the second intake passage immediately reaches the second pressure chamber through the second passage, and the valve immediately opens.

Moreover, when the valve is opened, the dynamic pressure of the supercharging pressure increased in the dynamic pressure increasing section maintains the valve in the open state jI!i, and the self-excited vibration of the valve is suppressed.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention, and the same or phase v1 portions as those in FIG. 2 are given the same reference numerals, and the explanation thereof will be omitted.

In the figure, (31) is a valve seat with four parts (32) formed around it, and (33) is a valve with a convex part (34) formed on the periphery. ) constitutes a dynamic pressure increasing section that increases the dynamic pressure of supercharging air. (35
) is the second passage with the conventional restriction (30) removed.

In the supercharging pressure control valve system configured in this way;
When the state changes from medium and high-load single load operation to rapid deceleration operation where the throttle valve (6) suddenly opens, the high positive pressure that has increased to a level higher than that during supercharging operation passes through the second passage (35) and becomes the second pressure. Room (
29), the pressure difference between the first pressure chamber (19) with high negative pressure and the second pressure chamber (29) with high positive pressure and the second intake path (5) which presses the valve (25). The supercharged air inside the valve (25
) immediately opens against the elastic force of the spring (28).

・When the valve is opened, the supercharged air guided from the second intake path (5) to the bypass passage (8) enters the recess (
32) and the convex portion (34) of the valve (33). At that time, the flow direction of the supercharging air changes, causing the valve (3
The dynamic pressure applied to the valve (3) increases, and this increase maintains the open state of the valve (33) and increases the dynamic pressure applied to the valve (33) due to minute fluctuations in the supercharging air pressure.
3) It suppresses self-excited vibration and prevents the generation of abnormal noise.

In addition, in the above embodiment, the case where the dynamic pressure increasing part was provided in both the valve seat part (31) and the valve (33) was explained.
For example, a plurality of convex portions may be formed only on the valve.

〔Effect of the invention〕

As explained above, according to the present invention, a dynamic pressure increasing portion that increases the dynamic pressure of supercharging air is formed in at least one of the valve and the valve seat, thereby suppressing self-excited vibration of the valve. This has the effect of improving the responsiveness of the valve by creating a gap and removing the restriction in the second passage.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a sectional view showing a conventional device. In L4, (3) is a supercharger, (4) is a first intake path,
(5) is the second intake passage, (6) is the throttle valve, (7) is the third intake passage, (8) is the bypass passage, (17) is the diaphragm, (19) is the first pressure chamber, (20 ) is the first passage, (28) is the spring, (29) is the second pressure chamber, (3
1) is the valve seat part, (32) is the fourth part, (33) is the valve, (34
) is a convex portion, and (35) is a second passage. In addition, in each figure, the same number 11 indicates the same or equivalent part. Punishment 1 Diagram 6: uO Nodo) Shiko [Criminal valve 9, Chilβ 77 room 20: Bud blood line 28° Subscription Procedural amendment amendment content December 14, 1985

Claims (1)

[Claims] A valve that opens and closes a bypass passage that communicates a first intake passage upstream of the supercharger with a second intake passage between the supercharger and the throttle valve, and a third intake passage downstream of the throttle valve. To,
A first pressure chamber communicated with the first passage leading to the pressure, a second pressure chamber communicating with the second intake passage through the second passage leading to the pressure, partitioning the first and second pressure chambers; a diaphragm connected to the valve, an elastic member for biasing the diaphragm in the closing direction of the valve, and the second
A supercharging pressure control valve device comprising a dynamic pressure increasing portion that increases the dynamic pressure of supercharging air when the supercharging air in an intake passage is released by opening a valve.