JPH02305324A - Supercharging pressure control valve device - Google Patents

Abstract

PURPOSE:To provide a small-sized and low-cost device by providing a by-path passage which bypasses the fan of a supercharger, and installing on the way a valve body mounted on a diaphragm driven by the differential pressure between upstream and downstream sides to construct a supercharging pressure control valve for an integrated structure of the supercharger and the supercharging pressure control valve. CONSTITUTION:In the housing 31 of a supercharger, the first and second by-path passages 34, 35 are formed, and in the housing 31, a case 36 is fixed through a diaphragm 38. The edge of the second by-path 35 is takes as a valve seat part 39 to make into contact with a valve body 40 installed on the diaphragm 38, and the diaphragm 38 is forced in the closing direction of the valve body 40 by action of a spring 42. At the time of middle and high load duty operation, a throttle valve is closed immediately, and when the negative intake pressure on the downstream side of the throttle valve increases, the pressure in the second by-path passage 35 increases to become positive high pressure, so that the valve body 40 is opened against the spring 42, and pressurized air is circulated between by-path passages 34, 35. It is thus possible to prevent the pressure on the upstream side of the throttle valve from increasing.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a supercharging pressure control valve device that suppresses abnormal pressure rise in the intake passage on the upstream side of the throttle valve that occurs during deceleration when the throttle valve closes. be.

[Conventional technology]

FIG. 2 is a sectional view showing a boost pressure control valve device for an internal combustion engine, which the present applicant has already proposed.
1) is an air cleaner that serves as an air intake section, (2) is an intake pipe that serves as a passage for the intake air (hereinafter referred to as "intake") from the air cleaner (1), and (3) is a supercharger attached to the intake pipe (2). (4) is the first intake passage showing the upstream side of the supercharger (3) in the intake pipe (2), and (5) is the second intake passage also showing the downstream side of the supercharger (3). passage, (6) is a throttle valve that controls the intake air, (7) is a third intake passage showing the downstream side of the throttle valve (6) in the intake pipe (2), and (8) is the first and second intake passage. (9) is a boost pressure control which controls the boost pressure of the second intake passage (5) by controlling the opening and closing of the pressure reducing passage (8). It is a valve.

The details of the boost pressure control valve (9) will be explained below. (10) is a cylindrical housing, and <11) is a second intake passage (5) formed inside the wall of the housing (1o). ), the second passage (13) is a flange at the lower end of the housing (10), and the opening (13) is formed in the intake pipe (2) constituting the second intake passage (5).
14). (15) is the flange (14)
(16) is the nipple that serves as the intake/exit port for the intake air, (17) is the housing (1
a disc-shaped diaphragm whose peripheral edge is sandwiched between the top peripheral edge of 0) and the top peripheral edge of a bottomed cylindrical case (18);
(19) is the first pressure chamber formed by the diaphragm (17) and the case (18), and (20) is the third intake passage (7).
) and a first passage (23a) and (23b) that communicate with each other via a pressure take-off boat (21) and a nipple (22) in order to introduce the pressure of
) is a dish-shaped holder that holds the center of the diaphragm (17), and (24) is a holder (23a) at one end.
The rod (25) is attached to the center of the rod (23b), and the rod (25) is attached to the other end of the rod (24).
(26) is a bearing that slidably supports the rod (24); (27) is the bearing (26); The bearing holder (28) that holds the case (18) and the holder (23)
a), the spring (29) is an elastic member that biases the diaphragm (17) in the valve closing direction; A second pressure chamber (30) is connected to the intake passage (5) through a second passage (11). This is an aperture that acts as ventilation resistance to give a time delay to the transmission speed.

Next, the operation of the boost pressure control valve device configured as described above will be explained. In a car and under high-load operating conditions, the throttle valve (6) is close to a fully open state, and the second and third intake passages (5) and (7) are closed due to the supercharging effect of the supercharger (3). Both are in a high positive pressure state, and the same positive pressure is also applied inside the first pressure chamber (19) and the second pressure chamber (29), so the diaphragm (17) has a valve with a spring (28). The biasing force of the body (25) in the valve closing direction acts, and the valve body (25) is in a completely closed state.

Then, when the above-mentioned medium and high load operating state changes to deceleration operation in which the throttle valve (6) suddenly closes, the pressure in the third intake passage (7) changes to high negative pressure and the pressure in the first pressure chamber (19
) becomes a high negative pressure, and the supercharging pressure in the second intake passage (5) rises to a level higher than that during supercharging operation, resulting in a high positive pressure, and the pressure passes through the second passage (11) to the second intake passage (5). The pressure is transmitted to the pressure chamber (29), and the valve body (25) opens against the elastic force of the spring (28), thereby preventing a rise in pressure on the upstream side of the throttle valve' (6).

[Problem to be solved by the invention]

In the conventional supercharging pressure control valve device configured as described above, the supercharger 3 and the supercharging pressure control valve 9 are connected separately and independently via the intake pipe 2, and installation requires little space. There was a problem with the size.

Further, there is also the problem that piping for the bypass passage 8 must be prepared together with the intake pipe 2, which increases manufacturing costs.

The present invention was made to solve these problems, and an object of the present invention is to obtain a supercharging pressure control valve device that can be downsized and reduce manufacturing costs.

[Means to solve the problem]

The supercharging pressure control valve device according to the present invention includes a housing in which a fan is rotatably provided, a case attached to the housing via a diaphragm, and a case that is formed inside the housing and is operated by the rotation of the fan. an intake passage that serves as a passage for the inhaled pressurized air; first and second bypass passages formed inside the housing and communicating with the intake passage; and attached to the diaphragm, the second bypass passage The valve body includes a valve body that opens a passage and communicates the first bypass passage and the second bypass passage.

[Effect]

In this invention, when the operating state changes from medium or high load operation to deceleration operation in which the throttle valve suddenly closes, the valve body opens and pressurized air circulates between the first bypass passage and the second bypass passage. do.

〔Example〕

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

FIG. 1 is a sectional view showing one embodiment of the present invention, in which a supercharger and a supercharging pressure control valve are integrated.

In the figure, (31) is the housing of the supercharger, (32)
(33) is an intake passage formed inside the housing (31) through which intake air passes; (34) and (35) are the fan rotatably provided inside the housing (31); First and second bypass passages are formed inside.

(36) is attached to the housing (31) via the bolt (37).
The case (38) attached to the case (38) is sandwiched between the case (36) and the housing (31), and between the two (36),
Rubber diaphragm sealing (31), (39)
is a valve seat formed on the end face of the second bypass passage (35), and this valve seat (39) and the surface of the housing (31) to which the diaphragm (38) is attached are located on the same plane. ing. (40) is a resin valve body burned into the diaphragm (38), (41) is the valve seat (39)
(42) is a spring compressed between the support (43) in the case (36) and the holder (44);
) is a nipple provided at the upper part of the case (36) and communicating with the downstream side of the throttle valve (arranged on the back side in the direction perpendicular to the plane of the drawing).

Next, the operation of the boost pressure control valve device configured as described above will be explained. In a car and under high-load operating conditions, the throttle valve is close to a fully open state, and the intake passage (33) is closed due to the supercharging effect of the supercharger fan (32).
Both the intake passage and the intake passage on the downstream side of the throttle valve are in a high positive pressure state, and the spaces on both sides of the diaphragm (38) are at the same positive pressure. As a result, the spring (42) acts on the diaphragm (38) to bias the valve body (40) in the valve closing direction, and the seal portion (41) comes into contact with the valve seat (39), causing the valve body (40) to close.
0) is in a completely closed state.

When the above-mentioned medium and high load operation changes to deceleration operation in which the throttle valve suddenly closes, the pressure in the intake passage downstream of the throttle valve changes to high negative pressure, and the inside of the case (36) becomes high negative pressure. Further, as long as the fan (32) is rotating, the pressure inside the second bypass passage (35) increases and becomes a high positive pressure, and as a result, the valve body 40) is forced to open against the elastic force of the spring (42). , the pressurized air passes through the first bypass passage 34
) and the second bypass passage (35), thereby preventing pressure increase on the upstream side of the throttle valve.

〔Effect of the invention〕

As explained above, the boost pressure control valve device of the present invention has the following features:
a housing in which a fan is rotatably provided; a case attached to the housing via a diaphragm; and an intake passage formed inside the housing and serving as a passage for pressurized air sucked in by rotation of the fan. first and second bypass passages formed inside the housing and communicating with the intake passage; attached to the diaphragm and opening the second bypass passage in response to the diaphragm to form the first bypass passage; By providing a valve body that communicates with the second bypass passage, it is possible to reduce the size by integrating the turbocharger and the boost pressure control valve, and to connect the turbocharger and the boost pressure control valve. This has the effect of reducing the manufacturing cost by reducing the number of piping. In addition, the diaphragm operates the valve body and also acts as a seal between the turbocharger housing and the boost pressure control valve case, and has the effect of being used efficiently. be.

[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 an example of a conventional boost pressure control valve device. In the figure, (31) is the housing, (32) is the fan, (33) is the intake passage, (34) is the first bypass passage, (35) is the second bypass passage, (36) is the case,
(38) is a diaphragm, and (40) is a valve body.

Claims (1)

[Claims] A boost pressure control valve device that suppresses abnormal pressure increase on the upstream side of the throttle valve that occurs during deceleration when the throttle valve closes includes a housing with a rotatable fan installed inside, and a case attached to the housing via a diaphragm. an intake passage formed inside the housing and serving as a passage for pressurized air sucked in by rotation of the fan; first and second bypass passages formed inside the housing and communicating with the intake passage; attached to the diaphragm and the second
a valve body that opens the bypass passage and communicates the first bypass passage and the second bypass passage, and when the operating state changes from a medium or high load operating state to a deceleration operation in which the throttle valve suddenly closes, A supercharging pressure control valve device, wherein the valve body opens and pressurized air circulates between a first bypass passage and a second bypass passage.