JPH07180554A - Engine cooling device - Google Patents

Abstract

PURPOSE:To perform installation of an engine only through interconnection of pipings and to simplify design of an engine body by a method wherein a thermostat valve, a bypass passage, and a water pump are disposed in a state to be collected to a radiator. CONSTITUTION:An engine cooling device 10 comprises a fan 21; a radiator 22; a cooling water piping 23; a thermostat valve 24; a bypass passage 25; and a water pump 26. A heat accumulating device 31 is located in the bypass passage 25. The thermostat valve 24, the bypass passage 25, and the water pump 26 are disposed in a summarized state to a radiator 22. The heat accumulating device 31 is provided at its interior with a heat accumulating agent. Heat is absorbed from high temperature cooling water flowing through a bypass passage 25 during preceding rotation of an engine 11 to store the heat. The heat accumulating device is disposed in such a manner that, during the cold starting of an engine 11, heat is radiated to low temperature cooling water flowing through the bypass passage 25. This constitution improves the warming-up characteristics of the engine 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling system for a water-cooled engine.

[0002]

2. Description of the Related Art As a conventional technique relating to the present invention, there is, for example, "Cooling structure for motorcycle water-cooled engine" disclosed in Japanese Utility Model Laid-Open No. 4-75129. As is well known in the water-cooled engine, the cooling water that has taken heat to rise in temperature when flowing through the cooling water passage in the engine body flows to the radiator through the cooling water pipe, radiates heat into the air and cools down. , Flows to the engine again. At this time, the flow of cooling water is generated by the water pump. Further, in a cold state such as immediately after the engine is started, a bypass passage and a thermostat valve are used to prevent the cooling water flowing out from the engine from flowing to the radiator in order to speed up warming up of the engine.

In the above prior art, a water pump is provided in the engine body, and a bypass passage and a thermostat valve are provided integrally with the radiator. Here, disposing the water pump main body on the engine side reduces the degree of freedom in engine design, which has been an obstacle to the disposition of other engine accessories that have become complicated in recent years.

[0004]

Therefore, it is a technical object of the present invention to prevent the engine cooling device from interfering with the arrangement of other engine accessories.

[0005]

[Means for Solving the Problems] In order to solve the above problems, the technical means taken by the present invention is an engine cooling device having a fan, a radiator, a cooling water pipe, a thermostat valve, a bypass passage and a water pump. The thermostat valve, the bypass passage, and the water pump are arranged in a radiator.

[0006]

According to the above-mentioned means, the thermostat valve, the bypass passage, the water pump, and the engine, which are centrally arranged in the radiator, are connected to the engine through the cooling water pipe, and the engine is water-cooled.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, an engine cooling device 10 cools a water-cooled engine 11, and includes a fan 21, a radiator 22 (22a is a pressure cap), a cooling water pipe 23, a thermostat valve 24, a bypass passage 25 and a water pump 26. It is mainly composed of. A heat storage device 31 is arranged in the bypass passage 25. As is clear from FIG. 1, the thermostat valve 24 and the bypass passage 25.
A water pump 26 and a water pump 26 are arranged so as to be integrated with the radiator 22.

The fan 21 is driven by a hydraulic or electric motor 41, and the water pump 26 is also driven by a hydraulic or electric motor 42. As is known, to use a hydraulic motor,
The hydraulic motor and a hydraulic pump (not shown) (generally different from the one for engine lubrication, and may be shared with the hydraulic pump for power steering in some cases) are used for hydraulic pipes, bypass passages, Oil cooler,
Equipment such as a reservoir tank and hydraulic control valve is required separately. On the other hand, in order to use the electric motor, devices such as electric wiring and a control unit are required separately.

The fan 21 and the water pump 26 may be coaxially driven by using a single hydraulic or electric motor 43 as shown in FIG. In this case, since the number of hydraulic or electric motors can be reduced, the total weight of the cooling device can be reduced, and the engine 11
It can also be expected to improve fuel efficiency. In addition, handling of hydraulic piping becomes easy, and not only the weight advantage but also the maintainability is improved and the reliability is improved by reducing the connecting portion.

The heat storage device 31 has a heat storage agent (not shown) therein, absorbs heat from the high temperature cooling water flowing through the bypass passage 25 at the time of the previous operation of the engine 11 and stores it, and when the engine 11 is cold started. By radiating heat to the low temperature cooling water flowing through the bypass passage 25, the warm-up characteristics of the engine 11 are significantly improved, and the performance of a heater (not shown) can be expected to be improved.

The heat storage agent varies depending on whether it is heat storage using sensible heat, heat storage using latent heat, or heat storage using chemical reaction. In the case of using sensible heat, N is used as the heat storage agent.
a, NaK, LiF, etc. are used, and in the case of utilizing latent heat, Li2 CO3, NaCl, MgCl2 as a heat storage agent.
Are used. These heat storage agents are publicly known and include those disclosed in, for example, JP-A-63-57856.

The portion surrounded by a dotted line 50 in FIG. 1 is an integrated portion and can be manufactured and sold as an Assy product (assembled product).

Reference numeral 61 denotes branch outflow piping to a heater, intake manifold, oil cooler, etc., not shown, and 62 denotes branch inflow piping from the heater, intake manifold, oil cooler, etc., respectively.

[0015]

The thermostat valve, the bypass passage and the water pump are arranged in the radiator so as to be integrated.
Installation on the engine is only required to connect the piping, which simplifies the design of the engine body and does not hinder the installation of other engine accessories. Another advantage is that water pumps and thermostat housings, which used to be different for each engine, can be made into a series.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an engine cooling device according to the present invention.

FIG. 2 is an alternative view of a main part in FIG.

[Explanation of symbols]

10 Engine Cooling Device 21 Fan 22 Radiator 23 Cooling Water Piping 24 Thermostat Valve 25 Bypass Passage 26 Water Pump

Claims (5)

[Claims] 1. An engine cooling device having a fan, a radiator, a cooling water pipe, a thermostat valve, a bypass passage and a water pump, wherein the thermostat valve, the bypass passage and the water pump are arranged in a radiator. Engine cooling system. 2. The engine cooling device according to claim 1, wherein a heat storage device is arranged in the bypass passage. 3. The engine cooling device according to claim 1, wherein the water pump is driven by a hydraulic pressure or an electric motor. 4. The engine cooling device according to claim 1, wherein the fan is driven by a hydraulic pressure or an electric motor. 5. The engine cooling device according to claim 1, wherein the fan and the water pump are coaxially driven by a hydraulic pressure or an electric motor.