JPH0721875Y2 - Pressure actuator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a pressure type actuator that can operate in multiple stages.

[Conventional technology]

A pressure type actuator having a plurality of diaphragms arranged concentrically for controlling an exhaust bypass valve of an exhaust turbocharger is known (Shokai Sho 60-8252).
(See publication 9). When this pressure type actuator is used, when the boost pressure is low, the exhaust bypass valve is opened little by little as the boost pressure becomes higher, and when the boost pressure becomes higher, the exhaust bypass valve becomes faster as the boost pressure becomes higher. Can be opened.

[Problems to be solved by the device]

However, when two turbochargers are provided, the desired relationship between the supercharging pressure and the opening degree of the exhaust bypass valve differs depending on the height of the supercharging pressure. That is, at the time of low supercharging in which only one turbocharger is performing supercharging, the desired pressure applied to the pressure type actuator, that is, the desired relationship between the supercharging pressure and the opening degree of the exhaust bypass valve is indicated by X in FIG. As shown, the valve opening gradually increases with respect to the applied pressure. On the other hand, at the time of high supercharging when another turbocharger starts the supercharging action, the desirable relationship between the applied pressure and the valve opening is as shown by Y in FIG. The relationship will increase rapidly. Therefore, when the applied pressure, that is, the supercharging pressure shifts from the low supercharging pressure to the high supercharging pressure, the valve opening is changed from the opening indicated by X to Y as shown by the solid line in FIG.
It is necessary to switch stepwise, that is, stepwise, up to the opening shown in.

However, the pressure type actuator described in Japanese Utility Model Laid-Open No. 60-82529 cannot change the valve opening stepwise in this way.

[Means for solving problems]

According to the present invention, in order to change the opening degree of the exhaust bypass valve stepwise, a first deformable partition member is disposed in the case, and a first actuation is provided on one side of the first deformable partition member. A pressure chamber is formed and a first atmospheric pressure chamber is formed on the other side of the first deformable partition member, and the other end of the first operating rod, one end of which is connected to the exhaust bypass valve, is connected to the first large pressure chamber. A first elastic means is provided which is connected to the first deformable partition wall member on the side of the air pressure chamber and applies a biasing force to the first working rod toward the side of the first working pressure chamber. A first deformable partition wall of the second deformable partition wall member, wherein the second deformable partition wall member is arranged outside the first working pressure chamber substantially coaxially with the first deformable partition wall member. Second on the member side
A second working pressure chamber is formed on the opposite side of the second deformable partition wall member from the first deformable partition wall member, and the second working rod is connected to the second large pressure chamber. The second working rod is connected to the second deformable partition wall member on the side of the air pressure chamber, and is provided with a second elastic means for applying a biasing force to the second working rod toward the second working pressure chamber. A free end of the first working pressure chamber so as to contact the first deformable partition member, and the first working pressure chamber is throttled or opened when the boost pressure exceeds a set pressure. The solenoid valves are connected to the supercharging passages of the two turbochargers and the second working pressure chamber is always connected to the supercharging passages of the two turbochargers.

[Action]

When the supercharging pressure is low, the pressure in the first working pressure chamber becomes substantially atmospheric pressure, so that the exhaust bypass valve operates by the supercharging pressure acting on the second working pressure chamber.
The valve is opened against the elastic means of No. 2 and the opening degree of the exhaust bypass valve at this time changes along X in FIG. On the other hand, when the supercharging pressure is high, the pressure in the first working pressure chamber becomes almost supercharging pressure. The exhaust bypass valve opening changes along Y in FIG. 3 at this time.

〔Example〕

 Hereinafter, description will be given with reference to the drawings.

Referring to FIG. 1, reference numeral 10 is an exhaust bypass duct of two turbochargers (not shown), and an exhaust bypass passage 12 is formed. An exhaust bypass valve 14 is arranged in the exhaust bypass passage 12, and the exhaust amount passing through the exhaust turbine can be controlled according to the opening degree of the exhaust bypass valve 14. The exhaust bypass valve 14 is fixed to a shaft 16, and a lever 18 is attached to the end of the shaft 16. An operating rod 22 of a pressure type actuator 20 is connected to the lever 18, and the bypass valve 14 can be opened and closed by operating the operating rod 22.

The pressure type actuator 20 includes a first case 24 and a second case 26 which are arranged on the coaxial line in an overlapping manner. A first diaphragm 28 is arranged in the first case 24. A first working pressure chamber 30 is formed on one side of the first diaphragm 28, and a first atmospheric pressure chamber 32 is formed on the other side. The working pressure introducing port 34 of the first working pressure chamber 30 is provided with a solenoid valve that opens when the boost pressure exceeds a set pressure or a throttle for delaying pressure transmission or the like. It is connected to the supply passage. A first spring 36 is arranged in the first atmospheric pressure chamber 32 to urge the first diaphragm 28 toward the first operating pressure chamber 30. The actuating rod 22 is connected to the first diaphragm 28 and extends through the first atmospheric pressure chamber 32 towards the lever 18.

A second diaphragm 38 is arranged in the second case 26. A second working pressure chamber 40 is formed on one side of the second diaphragm 38, that is, on the side opposite to the first diaphragm 28,
A second atmospheric pressure chamber 42 is formed on the other side. The working pressure inlet port 44 of the second working pressure chamber 40 is connected to the supercharging passage downstream of the compressor of the turbocharger. Second atmospheric chamber
A second spring 46 for urging the second diaphragm 38 toward the second working pressure chamber 40 side is arranged at 42.

Further, the auxiliary operating rod 48 is connected to the second diaphragm 38 on the side of the second atmospheric pressure chamber 42. The auxiliary actuation rod 48 is arranged substantially coaxially with the actuation rod 22.
The free end portion of the auxiliary operating rod 48 can contact the first diaphragm 28 by penetrating the upper and lower walls of the second casing 26 and the second casing 26 and entering the first operating pressure chamber 30. In the embodiment, in the initial state in which the working pressure is not introduced into the second working pressure chamber 40, the tip of the free end portion of the auxiliary working rod 48 is the first diaphragm 28 or the first diaphragm.
It does not come into contact with the fixing plate attached to 28, and a predetermined gap is opened between them. Further, the first working pressure chamber 30 and the second atmospheric pressure chamber 42 can communicate with each other through the fitting gap of the auxiliary working rod 48.

Next, the operation will be described. The working pressure introducing port 34 of the first working pressure chamber 30 is connected to the supercharging passage downstream of the compressor of the turbocharger through a solenoid valve or a throttle for delaying pressure transmission, and the working pressure introducing port 34 of the second working pressure chamber 40 is connected. Working pressure inlet 44
Is directly communicated with the supercharging passage, so that when the supercharging pressure rises, the supercharging pressure is first applied to the second working pressure chamber 40. By first supplying the working pressure to the second working pressure chamber 40, the second diaphragm 38 is deformed toward the first diaphragm 28. Therefore, the auxiliary operating rod 48 moves toward the first diaphragm 28. Since there is a predetermined gap between the tip of the free end portion of the auxiliary actuation rod 48 and the first diaphragm 28, the initial movement of the auxiliary actuation rod 48 becomes play, and the initial irregularity of the second diaphragm 38 is irregular. The primary deformation to provide linearity to the movement of the auxiliary actuation rod 48. Thus, the auxiliary operating rod 48 abuts the first diaphragm 28 or the operating rod 22 and pushes the operating rod 22 together with the first diaphragm 28, thereby driving the exhaust bypass valve 14 in the opening direction. At this time, the second diaphragm 38 is deformed against the first and second springs 36 and 46, and the operating rod 22 that drives the exhaust bypass valve 14 is driven.
The operating characteristic of is set by the total set pressure of these two springs 36 and 46 as shown by X in FIG.

Next, when the supercharging pressure further rises, this time the first working pressure chamber
The pressure inside 30 rises. That is, the air in the first working pressure chamber 30 leaks through the fitting gap of the auxiliary working rod 48, but when the first working pressure chamber 30 is connected to the supercharging passage through the throttle, If the boost pressure rises, the first working pressure chamber 30
When the first working pressure chamber 30 is connected to the supercharging passage via the solenoid valve, the supercharging pressure rises and the solenoid valve opens, so that the first working pressure increases. The pressure in the chamber 30 also rises. As a result, the exhaust bypass valve 14 adds the first diaphragm to the supercharging pressure acting on the second diaphragm 38.
The opening degree of the exhaust bypass valve 14 is gradually increased as indicated by Y in FIG. 3 because it is urged in the valve opening direction even by the supercharging pressure acting on 28.

FIG. 2 is a diagram showing a second embodiment of the present invention. In the second embodiment, the bellows 5 arranged in series in the case 21.
8 and 60 are used, and the other structures are almost the same as those of the first embodiment, so that they are denoted by the same reference numerals. First
A first working pressure chamber 30, a first atmospheric pressure chamber 32, and a second working pressure chamber 32 on both sides of the second bellows 58 and 60, respectively.
40 and the second atmospheric pressure chamber 2 are defined, and the operating rod 22 and the auxiliary operating rod 48 are respectively the first and second operating pressure chambers.
Opposite 30,40, it is connected to first and second bellows 58,60. However, because bellows are elastic in their own right,
A biasing force can be applied to the operating rod 22 without providing a spring. Therefore, there is no first spring 36 of the first embodiment that applies a biasing force to the operating rod 22. However, in order to have a high degree of freedom in the characteristics of operation, the first
The spring 36 may be inserted. The auxiliary actuation rod 48 has a second bellows 60 and a (second) spring 46.
It is designed to give a biasing force. With this structure, the bellows 58 and 60 are deformed similarly to the diaphragms 28 and 38 of the first embodiment.

[Effect of device]

When the supercharging pressure becomes high, the supercharging pressure can be increased stepwise.

[Brief description of drawings]

FIG. 1 is a sectional view showing an actuator and an exhaust bypass valve according to a first embodiment of the present invention, FIG. 2 is a sectional view showing a second embodiment, and FIG. 3 shows a valve opening characteristic of the actuator of the present invention. FIG. 14 ... Exhaust bypass valve, 22 ... Working rod, 24, 26 ... Case, 28, 38 ... Diaphragm, 30, 40 ... Working pressure chamber, 32, 4
2 ... Atmospheric pressure chamber, 36, 46 ... Spring, 48 ... Auxiliary actuating rod, 58, 60 ... Bellows.

Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location F15B 15/10 B 9026-3H Examiner Haruhiko Kubota (56) References US Patent 3576102 (US, A)

Claims (1)

[Scope of utility model registration request] 1. A pressure type actuator for controlling an exhaust bypass valve provided in an exhaust bypass duct of two turbochargers, wherein a first deformable partition member is arranged in a case. Forming a first working pressure chamber on one side of the deformable partition wall member and forming a first atmospheric pressure chamber on the other side of the first deformable partition wall member, one end of which is connected to the exhaust bypass valve. The other end of the first actuating rod is connected to the first deformable partition member on the first atmospheric pressure chamber side, and the first actuating rod is attached to the first actuating pressure chamber side. A first elastic means for applying a force is provided, and a second deformable partition member outside the first working pressure chamber is provided in the case substantially coaxially with the first deformable partition member. The first deformable partition member of the second deformable partition member. A second atmospheric pressure chamber on the side of the other partition member and a second working pressure chamber on the opposite side of the second deformable partition member from the first deformable partition member, A second actuating rod on the side of the second atmospheric pressure chamber
Second elastic means for applying an urging force toward the second operating pressure chamber side to the second operating rod, and the free end of the second operating rod. A portion of the partition wall projecting into the first working pressure chamber so that it can contact the first deformable partition wall member, and the first working pressure chamber is throttled or opened when the boost pressure exceeds a set pressure. A pressure type actuator which is connected to supercharging passages of two turbochargers via a solenoid valve which is operated, and at the same time is always connected to the supercharging passages of two turbochargers.