JPS6233945Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an exhaust pulsation type exhaust secondary air supply device for a horizontal cross-flow type engine.

As one type of exhaust purification system, a secondary air supply system that utilizes engine exhaust pulsation to intermittently supply secondary air to an exhaust manifold is put into practical use.

Such a secondary air supply system consists of a pipe connecting the air cleaner and the exhaust manifold, an on-off valve, a check valve, a silencer, etc. interposed between the pipes, and a counter flow system in which the intake system and the exhaust system are led out in the same direction. In the type engine, the air cleaner and exhaust manifold are close together, and the power auxiliary equipment attached to the engine is far from the air cleaner, so the installation of the secondary air supply system is easy.

By the way, when a cross-flow engine is adopted in which the engine is installed horizontally and the intake system is directed to the rear of the engine, and the exhaust manifold is led out to the opposite side of the intake system, the air cleaner and The secondary air supply system that connects the exhaust manifold on the opposite side must be installed around the engine body. On the other hand, in transverse engines, power auxiliary equipment is installed on one side of the engine, and the secondary air supply system connects to the exhaust manifold on the opposite side. Consideration must be given to system piping, and maintenance of these, peripheral equipment, and the secondary air supply system itself, etc., must be considered.

The present invention was developed in consideration of the above-mentioned problems in installing a secondary air supply system for a horizontal cross-flow type engine.

The purpose of this invention is to install a secondary air supply system consisting of a pipe body, an on-off valve, a reed valve, a silencer, etc. in a horizontal cross-flow engine without impairing the maintainability of auxiliary equipment. It is an object of the present invention to provide a secondary air supply device that can achieve a rational arrangement by utilizing space and keeping the bonnet line as low as possible.

To achieve the above objectives, the present invention has developed a cross-flow engine in which a secondary air supply pipe system including an on-off valve, a check valve, and a silencer is arranged above the intake pipe so as to be approximately parallel to the crankshaft axis. The upstream end of the pipe system is connected to the air cleaner, and the downstream end of the pipe system is connected to the exhaust system by bypassing the transmission side of the engine.

Next, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is an explanatory side view of the front part of the vehicle 1, in which the side surface of the engine is shown in solid lines, and FIG. 2 is a plan view of the same.

The engine 2 is mounted in the engine room 102 in the front part 101 of the vehicle 1.
is configured to be openable and closable with a bonnet 103, and is divided by a compartment 104 and a partition wall 105.

The engine 2 is installed in the engine room 102, and the engine 2 is a cross-flow type engine with an intake system located at the rear and an exhaust system located at the front.The engine 2 has a crankshaft located left and right in the engine room. It shows a horizontally mounted engine. The engine 2 includes a crankcase 201 at the bottom, a cylinder block 202 at the middle, and a cylinder head 20 at the top.
At the rear of the cylinder head 203, an intake pipe 3 with an approximately horizontal intake passage is extended rearward, and the intake pipe 3 is connected in communication with a carburetor 4 whose intake passage is approximately horizontal. A side draft type intake system is configured in which an air cleaner 5 is communicatively connected to the upstream end of the air cleaner 5 . On the other hand, an exhaust manifold 6 is provided at the front of the cylinder head 203, and its downstream end is connected to the upstream end of an exhaust pipe 7, and the exhaust pipe 7 extends rearward through just below the bottom of the crankcase 201. There is.

At the bottom of the cylinder block 202 of the engine 2, an output section 204 is led out to one side of the upper part of the crankcase 201, for example on the left side, and a generator 205 is installed behind the bottom of the cylinder block on this side of the engine, and a water pump 206 is installed above this. The air conditioner compressor 207 is installed at the front lower part of the cylinder block.
A power steering oil pump 208 is installed above this, and these pulleys 209 to 2
12 to the output section 20 via belts 216 to 218.
Multistage pulleys 213, 21 in the axial direction provided in 4
4,215 and is driven by engine power. In this way, the power auxiliary equipment is arranged on one side of the horizontal engine.

A transmission case 8 is disposed on the other side of the crankcase 201 of the engine 2, that is, on the right side, and a distributor 9, a thermovalve 10, etc. are provided above the transmission on this side of the engine. This is a radiator installed in front of the engine.

A secondary air supply pipe 12 is arranged on the upper surface of the intake pipe 3 extending rearward from the cylinder head 203 of the engine 2 so as to be substantially parallel to the engine crankshaft. In the pipe line 12 on the intake pipe 3, from the upstream side, that is, from the left side, a silencer 13, a shut-off valve 14 for controlling secondary air supply downstream of this, and a check valve 15 downstream of this are installed so as to communicate with each other. . The upstream part of the silencer 13 is connected via the communication pipe 121 to the silencer 16 provided on this side of the upper surface of the intake pipe, and the silencer 16 is communicated with the clean side of the air cleaner 5 facing rearward and partitioned by the element 501. They are connected via a pipe 122, and the pipe 122 bypasses the side of the intake pipe 3 and is connected to the air cleaner 5.

By the way, the on-off valve and the check valve are constructed as shown in FIG. 3, for example, and a body 155 of a reed valve 154 serving as a check valve is interposed between bodies 152 and 153 which are divided into upper and lower parts with a passage 151 in between. The upper body 152 has a passage 15 communicating with the valve opening 156.
7, 158 are provided, the upstream passage 157 is connected to the silencer 13 side by a pipe line, and the opening 156 is a valve body 142 that is opened and closed by a diaphragm 141.
A negative pressure chamber 143 defined by a diaphragm 141 is connected to the intake path of the carburetor 4, and detects the load condition of the engine and operates the diaphragm 141 against a spring 144 to open and close the valve. conduct.

The above body 153 is connected to the communication pipe 123, and the communication pipe 123 is led out to the transmission case 8 side of the engine, passes below the thermovalve 10 and the distributor 9, and bypasses the side of this side of the engine. The downstream end is connected to the intermediate portion of the exhaust manifold 6 in communication.

As is clear from the above, according to the present invention, the pipe line including the valves and the voluminous silencer is arranged on the upper surface of the intake pipe, so the intake system is made into a side draft type, keeping the bonnet line low and improving aerodynamic characteristics. In such cases, it is reasonable to be able to arrange these items without protruding above the engine, while suppressing the height and making effective use of the space above the intake pipe. intake system and valves,
It is advantageous in terms of maintenance of piping, etc. The upstream end of the piping is bypassed to one side of the intake pipe and connected to the air cleaner, which is advantageous in terms of maintenance such as attaching and detaching the belt of power auxiliary equipment on this side. By connecting the downstream end to the exhaust manifold by bypassing the other side of the engine,
It can be arranged rationally to avoid interference with equipment on this side, and it is advantageous in terms of maintenance of these equipment, and the piping is routed around the outside of the intake pipe and led to the exhaust manifold at a distance, so the exhaust gas flows backwards. It has great advantages such as being able to cool the gas temperature and protect valves etc. from heat damage.

[Brief explanation of the drawing]

FIG. 1 is an explanatory side view showing an engine at the front of a vehicle, FIG. 2 is a plan view thereof, and FIG. 3 is a longitudinal sectional side view showing an example of a valve. In the drawing, 2 is the engine, 5 is the air cleaner, and 6 is the engine.
12 is an exhaust manifold, 12 is a pipe, 13 and 16 are silencers, 14 is an on-off valve, 15 is a check valve, and 8 is a mission case.

Claims (1)

[Scope of utility model registration request] In a cross-flow engine, the air cleaner and exhaust manifold are connected by a pipe constituting an air passage, and the secondary air supply device supplies secondary air to the exhaust system. A secondary air supply pipe including a secondary air supply pipe is arranged above the intake pipe so as to be substantially parallel to the crankshaft axis,
The upstream end of the pipe is connected to the air cleaner by bypassing the intake pipe, and the downstream end of the pipe is connected to the exhaust system by bypassing the side of the engine that includes the transmission case. Secondary air supply device.