JP2812516B2 - EGR throttle chamber device - Google Patents

Description

The present invention relates to an intake system of an internal combustion engine, and in particular, is provided in an intake system of an internal combustion engine and functions as a negative pressure generating device of an exhaust gas recirculation device (EGR). It relates to an EGR throttle chamber device.

[Conventional technology]

In an internal combustion engine such as a diesel engine, a part of the exhaust gas is circulated to an intake passage by an exhaust gas recirculation device (EGR) for purifying the exhaust gas. In this exhaust recirculation device, exhaust gas recirculation is performed by generating a negative pressure in an intake passage, and for that purpose, an EGR throttle chamber device is arranged in the intake passage from the downstream of the air cleaner to the internal combustion engine.

The EGR throttle chamber generally includes a diaphragm device having a built-in diaphragm operated by a negative pressure of a vacuum pump, a link driven by a rod integrated with the diaphragm device, and a link that rotates integrally with the link.
The servo diaphragm device includes a throttle shaft to which a throttle valve is fixed, a throttle chamber body that forms a bearing of the throttle shaft and houses the throttle valve, and the servo diaphragm device is integrally attached to the throttle chamber body.

As described above, the conventional EGR throttle chamber device is configured as a single product, and the specific mounting method is such that, in an internal combustion engine without a turbocharger, a throttle chamber body is provided as a component of an intake passage such as an intake manifold or an air cleaner. Is bolted at a flange portion, the other end is inserted into a hose, and fixed with a band. Further, in an internal combustion engine equipped with a turbocharger for high output, a method such as bolting a flange portion of a throttle chamber body between a supercharging passage and an intake manifold is provided downstream of a compressor of the turbocharger. I am wearing it.

In addition, Japanese Patent Laid-Open No.
-24445, JP-A-56-124664 and the like.

[Problems to be solved by the invention]

As described above, the conventional EGR throttle chamber device is mounted to the intake manifold components such as the intake manifold and air cleaner by bolting the flange of the throttle chamber body to the components, but since it is a single product, it is mounted There are problems such as the above restrictions and the inability to secure sufficient installation space. Also, parts for mounting are required, and mounting work is also required.

An object of the present invention is to provide an EGR throttle chamber device that requires a small installation space, can reduce the number of parts, and can reduce mounting work.

[Means for solving the problem]

To achieve the above object, according to the present invention, a throttle valve disposed inside an inlet portion of a compressor case of a turbocharger, the throttle valve is fixed, and the throttle valve is rotated to an inlet portion of a compressor case of the turbocharger. A throttle shaft which is freely supported and one end of which protrudes outside the inlet of the compressor case of the turbocharger, a link which is fixed to one end of the throttle shaft which protrudes outside the inlet of the compressor case, and a turbocharger; A support plate attached to the compressor case of the above, and an actuator fixedly supported by the support plate, an operation rod of the actuator is engaged with a link, and a throttle valve is rotated by using the actuator to form an intake passage. To generate negative pressure. EGR throttle chamber device is provided to symptoms.

The actuator that drives the throttle shaft can take any form, such as a diaphragm device, a solenoid valve,
In each case, preferably, the actuator is mounted on a compressor case.

[Action]

By providing the throttle shaft and the throttle valve integrally with the inlet of the compressor case of the turbocharger, the structure becomes compact, the number of parts can be greatly reduced, and the mounting work is also reduced.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In FIG. 1, a turbine case 4 of a turbocharger 50 is mounted on an exhaust passage 2 of an engine 1, and an exhaust passage 5 is connected to an outlet side of the turbine case 4. The turbine case 4 includes the turbine impeller 3, and a compressor impeller 6 is mounted on the other end of the same shaft as the turbine impeller 3. The compressor impeller 6 is housed in a compressor case 7, and the outlet side of the compressor case 7 is connected to the engine 1 via a supercharging passage 8. Also,
The compressor case 7 has an inlet portion 7A, and the inlet portion 7A
Is connected to an air cleaner 16 via an intake passage 15.

51 is an EGR throttle chamber device of the present embodiment,
The inlet portion 7A of the compressor case 7 also serves as a throttle chamber body of the EGR throttle chamber device 51.

That is, the EGR throttle chamber device 51 includes a throttle valve 9 disposed in the compressor case inlet portion 7A, and a throttle shaft to which the throttle valve 9 is fixed and rotatably supported via a bearing at the inlet portion 7A.
10 and a diaphragm device 11 for driving the throttle shaft 10. The diaphragm device 11 includes a diaphragm 12, and has a negative pressure chamber 24 and an atmosphere chamber 25 formed therein. A rod 13 is fixed to the diaphragm 12, a link 14 is pivotally connected to an end of the rod 13, and the link 14
It is fixed to one end of the throttle shaft 10 outside 7A.

The negative pressure chamber 24 of the diaphragm device 11 has a solenoid valve 18
And an inlet port of a solenoid valve 18 and a vacuum pump 17. The third port of the solenoid 18 is open to the atmosphere. The inlet port of another solenoid valve 19 is connected to the vacuum pump 17, the outlet port of the solenoid valve 19 is connected to the negative pressure chamber 26 of the EGR valve 20, and the third port is open to the atmosphere.

The exhaust passage 2 of the engine 1 and the EGR valve 20 are connected by an EGR gas passage 21, and the EGR valve 20 and the supercharging passage 8 are connected by an EGR
The two EGR gas passages 21 and 22 are connected by the gas passage 22 and are opened by opening the valve body 27 of the EGR valve 20.

The solenoid valves 18 and 19 are activated by a command signal from the control unit 28 which receives and determines information such as an accelerator opening signal, a rotation speed sensor, and a water temperature sensor.
Normally, the solenoid valves 18 and 19 do not operate, the throttle valve 9 is open, and the EGR valve 20 is closed.

Fig. 2 shows the compressor case 7 of the turbocharger 50
5 shows a mounted state of the EGR throttle chamber device 51 with respect to FIG. The diaphragm device 11 is attached to the compressor case 7 by a support 52.

In the above configuration, the exhaust gas discharged from the engine 1 is guided to the turbine case 4 through the exhaust passage 2, rotates the turbine impeller 3, and is discharged from the exhaust passage 5 to the atmosphere via the muffler. On the other hand, turbine impeller 3
The compressor impeller 6 fixed to the
The air sucked from the air cleaner 16 is supercharged and supplied to the engine 1 through the supercharging passage 8.

When the solenoid valve 18 is opened by a command signal from the control unit 28, a negative pressure is applied to the negative pressure chamber 24 of the servo diaphragm device 11 by the vacuum pump 17, and the diaphragm 12 is pulled up and the rod 13 is pulled up at the same time. As a result, the link 14 rotates and the throttle valve 9
Is moved to a certain opening degree, and the intake passage formed by the inlet portion 7A of the compressor case 7 is closed. As a result, a negative pressure is generated in the supercharging passage 8. At the same time, the solenoid valve 19 is opened by a command signal from the controller unit 28, and a negative pressure is applied to the negative pressure chamber 26 of the EGR valve 20 by the vacuum pump 17 to open the valve body 27. As a result, part of the exhaust gas in the exhaust passage 2 passes through the valve element 27 opened from the EGR gas passage 21, is guided to the supercharging passage 8 via the EGR gas passage 22, and is supplied to the engine 1.

When there is no command signal from the control unit 28 and the pressure is higher than a certain supercharging pressure, the solenoid valves 18 and 19 are closed. As a result, the throttle valve 9 is open, and the intake air flows freely. At the same time, EGR valve 2
The zero valve element 27 is closed, and the exhaust gas does not flow to the EGR gas passage 22 and the supercharging passage 8.

According to the present embodiment, the inlet portion of the compressor case 7
7A also serves as the throttle chamber body of the EGR throttle chamber device 51, and the throttle valve 9 and the throttle shaft 10 are integrated with the compressor case 7, so that
Compact and simple EGR without taking up installation space
The throttle chamber device 51 can be configured. Also, the number of parts can be greatly reduced, and the mounting work is also reduced. Further, since a throttle chamber body is not required, a significant cost reduction can be achieved. Further, the throttle valve 9 of the EGR throttle chamber device 51 is located on the upstream side of the compressor impeller 6, and is at atmospheric pressure without applying supercharging pressure. Therefore, air or oil mist does not leak from the gap between the throttle shaft 10 and the bearing portion of the inlet portion 7A. Thus, it is not necessary to seal the throttle shaft 10 and the bearing for preventing leakage.

Another embodiment of the present invention will be described with reference to FIG. In this embodiment, an electromagnetic valve is used for an actuator of an EGR throttle chamber device and an EGR valve.

In FIG. 3, the EGR throttle chamber device 70 has a solenoid valve 29, the rod 13 of which is pivotally connected to the link 14, and the throttle shaft 10 is driven by the solenoid valve 29. The solenoid valve 29 is attached to the inlet portion 7A of the compressor case 7 by a support plate 71 conceptually indicated by a dotted line. The EGR valve 30 has an electromagnetic valve 31, and a rod 32 of the electromagnetic valve 31 is connected to a valve 27, and the valve 27 is opened and closed by the electromagnetic valve 31. The solenoid valves 29, 31 operate simultaneously or individually according to a command signal from the control unit 28.

When the solenoid valve 29 is operated by a command signal from the control unit 28, the throttle valve 9 is opened and closed to a predetermined opening degree via the rod 13 and the link 14, and the intake passage formed by the inlet portion 7A is closed. As a result, a negative pressure is generated in the supercharging passage 8. Simultaneously or separately, the electromagnetic valve 31 is operated by a command signal of the control unit 28, and the EGR valve main body 27 is opened via the rod 32. Thereby, a part of the exhaust gas in the exhaust passage 2 is sucked into the supercharging passage 8,
It is supplied to the engine 1. A series of these operations are controlled by the control unit 28.

According to this embodiment, the same effect as that of the first embodiment can be obtained. Further, according to this embodiment, since the opening and closing of the throttle valve and the opening and closing of the EGR valve are performed by the electromagnetic valve, fine exhaust gas recirculation control can be performed by a command signal of the control unit.

〔The invention's effect〕

According to the present invention, since the throttle shaft and the throttle valve are provided integrally with the compressor case of the turbocharger, the configuration is compact, the number of parts can be greatly reduced, and the mounting work is also reduced. Also, since a throttle chamber body is not required, a significant cost reduction can be achieved. Furthermore, since the EGR throttle chamber device is arranged on the upstream side of the compressor impeller, leakage of supercharged air or oil mist from the gap of the bearing portion is eliminated.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of an exhaust gas recirculation device having an EGR throttle chamber device according to an embodiment of the present invention, and FIG. 2 is a perspective view showing the EGR throttle chamber device and a turbocharger integrated with the EGR throttle chamber device. FIG. 3 is a schematic view of an exhaust gas recirculation device having an EGR throttle chamber device according to another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1 ... Engine 3 ... Turbine impeller 6 ... Compressor impeller 7 ... Compressor case 7A ... Inlet 9 ... Throttle valve 10 ... Throttle shaft 11 ... Turbocharger 51 EGR throttle chamber device 52 Support plate 60 EGR throttle chamber device 61 Air cleaner 62 Air cleaner case 62A Outlet 63 Support plate 70 EGR throttle chamber device 71 Support plate

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-57-159922 (JP, A) JP-A-55-123344 (JP, A) JP-A-56-124664 (JP, A) JP-A-57-159 129245 (JP, A) JP-A-57-24445 (JP, A) JP-A-57-172151 (JP, U) JP-A-64-29227 (JP, U) JP-A-58-22449 (JP, U) Japanese Utility Model 2-101064 (JP, U) Japanese Utility Model 58-15483 (JP, U) Japanese Utility Model 57-2228 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) F02M 25/07 570

Claims (3)

(57) [Claims] An internal combustion engine provided with a turbocharger which rotates a turbine impeller by exhaust gas and is fixed to the same shaft as the turbine impeller and rotates a compressor impeller housed in a compressor case to supercharge intake air. Located in the intake passage, with the throttle shaft,
An EGR throttle chamber device having a throttle valve fixed to the throttle shaft and an actuator for driving the throttle shaft, wherein the throttle valve (9) disposed inside an inlet portion of a compressor case of the turbocharger; A throttle shaft (10) rotatably supported at the inlet of the compressor case of the turbocharger, one end of which protrudes outside the inlet of the compressor case of the turbocharger; A link (14) fixed to one end of the shaft protruding outside the inlet portion of the compressor case; a support plate (52) attached to the compressor case of the turbocharger; Actuators (11,2
9), the operation rod (13) of the actuator (11, 29) is engaged with the link (14), and the actuator is used to rotate the throttle valve to generate a negative pressure in the intake passage. An EGR throttle chamber device, characterized in that: 2. An EGR throttle chamber device according to claim 1, wherein said actuator is a diaphragm device (11). 3. An EGR throttle chamber device according to claim 1, wherein said actuator is a solenoid valve (29).