JPH0629446Y2 - Lubricator for engine with supercharger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a lubricating device for an engine having an exhaust turbine supercharger, and more particularly to lubricating a bearing portion of the supercharger. .

(Prior Art) Conventionally, for example, as disclosed in Japanese Utility Model Laid-Open No. 60-72913, an engine including an exhaust turbine type supercharger driven by exhaust gas has a rotating shaft connecting a turbine wheel and a compressor wheel. However, in order to prevent burning due to exhaust heat and heat generated by rotation of the rotary shaft, a part of the lubricating oil of the engine is supplied from above the bearing portion and is discharged from below. Lubricating oil is evenly supplied to the bearings.

Since the lubricating oil supply passage is close to the exhaust manifold in such a structure, the temperature of the lubricating oil is likely to rise by directly receiving the exhaust heat. In this case, while the engine is operating, the lubricating oil supplied from the oil pump always flows through the lubricating oil passage, so the temperature of the lubricating oil does not rise excessively. Since the lubricating oil supplied from the pump is stopped, the flow of the lubricating oil field in the lubricating oil passage is limited to that of the oil existing in the lubricating oil passage.

In such a state, the lubricating oil that descends toward the bearing portion in the lubricating oil supply passage receives the exhaust heat from the exhaust manifold and is transmitted to the inner wall of the lubricating oil supply passage that is at a high temperature. The oil was carbonized by this high heat,
There is a problem that the area of the lubricating oil supply passage is reduced. This problem becomes particularly noticeable when the engine is stopped immediately after high load operation.

As described above, when the area of the lubricating oil supply passage is narrowed by the carbonization of the lubricating oil, the lubricating action of the lubricating oil is reduced, which causes a problem that the function of the exhaust turbine supercharger is deteriorated.

(Purpose of Invention) The present invention has been made to solve the above problems.
An object of the present invention is to provide a lubricating device for a supercharged engine with high reliability by preventing carbonization of the lubricating oil in the lubricating oil supply passage and preventing seizure of the bearing portion with a simple structure. .

(Structure of the Invention) According to the present invention, a rotating shaft having a turbine wheel driven by exhaust gas at one end and a compressor wheel at the other end for supercharging intake air to supply it to a combustion chamber is pivotally supported by a bearing portion. At the same time, it has a lubricating oil supply port for supplying lubricating oil from above to the bearing part and a lubricating oil return port for returning the lubricating oil supplied to the bearing part and is connected to the downstream end of the exhaust manifold. In the lubrication device for a supercharged engine including a feeder, the lubrication supply passage connected to the lubricating oil supply port is directed from the rear to the front of the vehicle body as it goes upward from the connecting portion, and from the exhaust manifold. The bearing is inclined so as to move away from the bearing portion and communicates with the bearing portion.

(Advantages of the Invention) With the above-described configuration, the heating of the lubricating oil supply passage due to the exhaust heat of the exhaust manifold can be suppressed, and the lubricating oil is not supplied to the bearing portion after the engine is stopped. When the lubricating oil existing in the exhaust manifold descends along the inner wall of the lubricating oil supply passage to the bearing portion, it descends along the inner wall of the lubricating oil supply passage located on the opposite side of the exhaust manifold, so that the exhaust heat of the exhaust manifold is directly I will not receive it. Furthermore, as the lubricating oil supply passage inclines from the rear to the front of the vehicle body as it goes upward, the cooling wind directly hits the wall surface of the lubricating oil supply passage located on the side opposite to the exhaust manifold while the vehicle is running. The inner wall of the lubricating oil supply passage is positively cooled. Therefore, carbonization of the lubricating oil in the lubricating oil supply passage can be prevented, and a highly reliable lubricating device for the engine with a supercharger can be provided.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, 1 is an engine arranged in a vehicle width direction of a vehicle body, 2 is an exhaust manifold connected to a cylinder head 1a of the engine 1, 3 is a downstream end of the exhaust manifold 2, It is an exhaust turbine type supercharger driven by exhaust gas.

The exhaust turbine type supercharger 3 is, as shown in FIG.
A turbine wheel 4 driven by exhaust gas at one end thereof, and a rotary shaft 6 having a compressor wheel 7 at the other end thereof for supercharging intake air to supply it to a combustion chamber are supported by bearings 5a and 5b. A lubricating oil supply port 9 for supplying lubricating oil from above to the bearings 5a, 5b and a lubricating oil discharge port 11 for discharging this lubricating oil below the bearings 5a, 5b are provided.

Then, an oil pump (not shown) provided in the engine 1 causes a part of the lubricating oil of the engine to move to the bearing portion 5a,
The lubricating oil supply passage 8 to be supplied to 5b is moved away from the exhaust manifold 2 as it goes upward, that is,
Lubricating oil supply port 9 tilted from the front of the vehicle toward the rear
A lubricating oil return passage 10 which communicates the lubricating oil from below the bearings 5a and 5b into the crankcase of the engine 1 and communicates with the lubricating oil discharge port 11 to form a lubricating device for the bearings 5a and 5b. I am configuring.

By providing the lubricating oil supply passage 8 as described above, the operation of the oil pump is stopped after the engine 1 is stopped and the lubricating oil present in the lubricating oil supply passage 8 is
When the lubricating oil descends along the inner wall of the bearing portion 5a, 5b, the lubricating oil descends along the inner wall of the lubricating oil supply passage 8 located on the opposite side of the exhaust manifold 2. It will no longer receive the exhaust heat of directly.

Therefore, carbonization of the lubricating oil in the lubricating oil supply passage 8 can be prevented, and seizure of the bearing portions 5a and 5b can be prevented, so that a highly reliable lubricating device for a supercharged engine can be provided. it can.

Further, when the lubricating oil supply passage 8 is configured to incline from the front side to the rear side of the vehicle body as in this embodiment, the cooling air wind directly hits the pipe wall surface of the lubricating oil supply passage 8 while the vehicle is running, Since the wall surface of the lubricating oil supply passage 8 located on the opposite side of the exhaust manifold 2 where the lubricating oil drops after the engine is stopped is cooled, the effect of the present invention becomes more remarkable.

[Brief description of drawings]

FIG. 1 is a side view showing a configuration of a lubricating device for an engine with a supercharger according to an embodiment of the present invention, and FIG. 2 is a detailed view of an exhaust turbine type supercharger. 3 ... Exhaust turbine type turbocharger, 4 ... Turbine wheel, 5a, 5b ... Bearing section, 6 ... Rotating shaft, 7 ... Compressor wheel, 8 ... Lubricating oil supply passage, 10 ... Lubricating oil return aisle.

Claims (1)

[Scope of utility model registration request] 1. A rotating shaft having a turbine wheel driven by exhaust gas at one end and a compressor wheel at the other end for supercharging intake air to supply to a combustion chamber is pivotally supported by a bearing portion, and the bearing is also provided. And a supercharger connected to the downstream end of the exhaust manifold, the unit having a lubricating oil supply port for supplying lubricating oil from above and a lubricating oil return port for returning the lubricating oil supplied to the bearing unit. In the lubrication device for a supercharged engine, the lubrication supply passage connected to the lubrication oil supply port is inclined from the rear of the vehicle body toward the front as it goes upward from the connection portion and away from the exhaust manifold. A lubricating device for an engine with a supercharger, characterized by being communicated with the bearing portion.