JPH0614030Y2 - Water-cooled internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a water-cooled internal combustion engine in which a cylinder block and a cylinder head are cooled by circulating cooling water with a radiator.

[Conventional technology]

Generally, this type of water-cooled internal combustion engine sends cooling water cooled in a radiator from a lower tank in the radiator into a cooling water jacket in a cylinder block by a cooling water pump, and the cooling water is supplied in a cooling water jacket in a cylinder head. After leading to
It is well known that the cooling water outlet is forcedly circulated back to the upper tank of the radiator.

In this case, in the conventional internal combustion engine, the radiator for the internal combustion engine is provided in front of the front end face of the internal combustion engine (the end face opposite to the output side rear end face of both end faces at both ends in the crankshaft direction). It was common to arrange this radiator and connect the cooling water pump and the cooling water outlet provided on the front end face of the internal combustion engine with a pipe made of rubber pipe. And a wide space for arranging the rubber pipe must be formed, and it is difficult to connect and disconnect the rubber pipe. There was a problem.

Therefore, Japanese Utility Model Publication No. 49-40187 as a prior art discloses a structure in which a radiator is arranged in front of a front end face of an internal combustion engine, and a cylinder block from the radiator is provided on a longitudinal side surface of the internal combustion engine parallel to a crankshaft. A cooling water outlet from the cylinder head is provided on the rear end face of the internal combustion engine while connecting the cooling water return pipe to the cooling water outlet and the radiator extending in the direction of the crankshaft on the upper surface of the internal combustion engine. It is proposed to connect with the cooling water outlet pipe made of rubber pipe arranged in this way.

[Problems to be solved by the device]

However, as in this prior art, when the radiator disposed in front of the front end face of the internal combustion engine and the cooling water outlet pipe connecting the cooling water outlet provided on the rear end face of the internal combustion engine are rubber pipes, The outer diameter of the cooling water outlet pipe becomes large, and it is necessary to arrange this large diameter cooling water outlet pipe on the upper surface of the internal combustion engine so as to extend in the direction of the crankshaft. Since the overall height up to the upper surface of the cooling water outlet pipe becomes high, when the internal combustion engine is mounted on a vehicle, the engine room in the vehicle must be large, and moreover, the upper surface of the internal combustion engine is made of the rubber pipe. Arranging the cooling water outlet pipe so as to extend in the longitudinal direction means that the cooling water outlet pipe must be removed each time when inspecting the valve operating mechanism on the upper surface of the cylinder head. Since it is necessary to reduce the workability of the inspection of the valve operating mechanism, the cooling water outlet pipe made of rubber pipe is not bent in the middle (if there is a bend in the middle, The air is accumulated in the part, which obstructs the flow of the cooling water.) It is arranged along the upper surface of the internal combustion engine, so it deteriorates early by the heat of the internal combustion engine, in other words, the durability of the rubber pipe cooling water pipe. However, since the cooling water pipe made of rubber pipe is longer than the entire length of the internal combustion engine, the cost is considerably increased.

An object of the present invention is to solve the above-mentioned problems of this prior art.

[Means for Solving the Problems]

To achieve this object, the present invention provides a radiator in front of a front end face of an internal combustion engine having an intake manifold on one longitudinal side and an exhaust manifold on the other longitudinal side, and a cylinder from a lower tank of the radiator. The cooling water return pipe to the block is connected to the cylinder block, while the cooling water outlet from the cylinder head is provided on the rear end face of the internal combustion engine, and the cooling water outlet and the radiator upper tank are connected to the cooling water outlet pipe. In a water-cooled internal combustion engine that is connected via
A portion of the cooling water outlet pipe along the internal combustion engine is formed of a metal pipe, and the metal pipe is provided at a portion between the upper surface of the internal combustion engine and the exhaust manifold, and the other long side surface of the internal combustion engine. It is arranged so as to extend along.

[Function and effect of device]

With this configuration, the cooling water outlet pipe connecting the upper tank of the radiator arranged in front of the front end face of the internal combustion engine and the cooling water outlet provided on the rear end face of the internal combustion engine, as in the prior art, Since it does not project above the upper surface of the internal combustion engine and can be arranged at a position lower than the upper surface of the internal combustion engine, it is possible to prevent the total height dimension of the internal combustion engine from increasing due to the cooling water outlet pipe, and When removing the cylinder head cover on the upper surface, it is not necessary to remove the cooling water outlet passage.

Further, of the long cooling water outlet pipe connecting the upper tank of the radiator and the cooling water outlet at the rear end face of the internal combustion engine, the portion along the internal combustion engine is configured by the metal pipe as described above, thereby cooling the Although the water outlet pipe is arranged above the exhaust manifold, it is possible to reliably prevent the cooling water outlet pipe from being damaged by the heat of the exhaust manifold and the cylinder head, and to provide the cooling water outlet. The length of the rubber pipe used for the cooling water outlet pipe can be greatly shortened because the rubber pipe used for the pipe can be limited to only the connection portion with the cooling water outlet and the radiator.

Moreover, by constructing a portion of the long cooling water outlet pipe along the internal combustion engine with a metal pipe, by supporting this metal pipe, the long cooling water outlet pipe is prevented from bending in the middle thereof. It is very easy to support.

Therefore, according to the present invention, the radiator upper tank disposed in front of the front end face of the internal combustion engine and the cooling water outlet provided on the rear end face of the internal combustion engine are provided with a long cooling water outlet pipe along the longitudinal direction of the internal combustion engine. This long cooling water outlet pipe prevents an increase in the overall height of the internal combustion engine, reduces the engine room in an automobile, and inspects the valve operating mechanism on the upper surface of the cylinder head. It is possible to improve the durability of the long cooling water outlet pipe without hindering it, and further, it is possible to shorten the length of the rubber pipe used for the long cooling water outlet pipe, and Since the support for the cooling water outlet pipe can be made extremely simple, the cost can be significantly reduced.

〔Example〕

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 indicates both left and right long side surfaces 1 parallel to a crankshaft.
The intake manifold 2 is provided on one of the longitudinal sides of a and 1b.
Is the internal combustion engine having the exhaust manifold 3 with the heat cover 4 on the other longitudinal side surface 1b, and reference numeral 5 is the radiator disposed in front of the front end surface 1c of the internal combustion engine 1.

A cooling water pump 6 for sending cooling water to a cooling water jacket in a cylinder block is provided on one longitudinal side surface 1a of the internal combustion engine 1, and a lower tank of the radiator 5 is provided on a suction side of the cooling water pump 6. A cooling water return pipe 7 from 5a is connected.

The cooling water return pipe 7 includes a metal pipe 7a in the middle thereof, a rubber pipe 7b for joining the metal pipe 7a to the lower tank 5a and the cooling water pump 6,
7c and.

A cooling water outlet 8 from a cooling water jacket in the cylinder head is provided on the rear end surface 1d of the internal combustion engine 1, and a cooling water outlet pipe 9 is provided between the cooling water outlet 8 and the upper tank 5b of the radiator 5. Connect with.

And, this cooling water outlet pipe 9 is a metal pipe 9a in a portion along the longitudinal direction of the internal combustion engine 1, and a rubber pipe 9b for joining the metal pipe 9a to the cooling water outlet 8 and the upper tank 5b. , 9c, and a metal pipe 9a of the cooling water outlet pipe 9 extends along the other longitudinal side face 1b of the internal combustion engine 1 at a portion between the upper surface of the internal combustion engine 1 and the exhaust manifold 3. The arrangement is made as follows.

The cooling water outlet pipe 9 has a metal pipe 9a in the middle thereof attached to the heat cover 4 for the exhaust manifold 3, a cylinder head, or the like, so that the cooling water outlet 8 to the radiator 5 are connected as shown in FIG. The upper tank 5b is configured to have an upward slope.

In this configuration, the cooling water cooled in the radiator 5 is sent from the lower tank 5a in the radiator 5 through the cooling water return pipe 7 into the cooling water jacket in the cylinder block by the cooling water pump 6, and then in the cylinder head. After flowing into the cooling water jacket, it is forcibly circulated from the cooling water outlet 8 through the cooling water outlet pipe 9 to return to the upper tank 5b in the radiator 5.

[Brief description of drawings]

FIG. 1 is a side view and FIG. 2 is a plan view showing an embodiment of the present invention. 1 ... Internal combustion engine, 1a ... One longitudinal side surface of the internal combustion engine,
1b ... Another longitudinal side surface of the internal combustion engine, 1c ... Front end surface of the internal combustion engine, 1d ... Rear end surface of the internal combustion engine, 2 ... Intake manifold, 3 ... Exhaust manifold, 5 ... Radiator, 5a. Lower tank of radiator, 5b ... upper tank of radiator, 6 ... cooling water pump, 7 ... cooling water return pipe, 8 ... cooling water outlet, 9 ... cooling water outlet pipe.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References Open 61-151030 (JP, U) Open 62-88829 (JP, U) Open 61-122322 (JP, U) Open 59- 174320 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A radiator is disposed in front of a front end face of an internal combustion engine having an intake manifold on one longitudinal side and an exhaust manifold on the other longitudinal side, and cooling water returning from a lower tank of the radiator to a cylinder block. While connecting the pipe to the cylinder block, a cooling water outlet from the cylinder head is provided on the rear end surface of the internal combustion engine, and the cooling water outlet and the upper tank of the radiator are connected via a cooling water outlet pipe. In the water-cooled internal combustion engine, a portion of the cooling water outlet pipe along the internal combustion engine is configured by a metal pipe, and the metal pipe is provided at a portion between the upper surface of the internal combustion engine and the exhaust manifold. A water-cooled internal combustion engine, which is arranged so as to extend along the other longitudinal side surface of the engine.