JP4501707B2 - Engine cooling system - Google Patents

Description

  The present invention relates to an engine cooling apparatus in which an electric heater unit for heating cooling water is disposed in a cooling water passage of a multi-cylinder serial engine.

It has been conventionally known that an electric heater for heating the cooling water is provided in the cooling water passage of the engine in order to improve the fuel consumption by heating the cooling water when it is cold. It is also conventionally known that the electric heater for heating the cooling water is disposed in the cabin heater circulation passage that guides the cooling water flowing through the water jacket of the engine body to the cabin heater for heating the passenger compartment (for example, , See Patent Document 1).
JP-A-11-334344

  However, since the power supply battery for vehicles has a low voltage, it is necessary to lengthen the heating wire and arrange a number of them in parallel in order to make the heat generation amount of the electric heater sufficient. Therefore, it is a problem to secure a space for arranging the electric heater unit, and in particular, how to arrange the electric heater unit and the piping system in a compact manner while improving the heat exchange efficiency.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an engine cooling apparatus in which an electric heater unit and a piping system can be arranged in a compact manner while improving heat exchange efficiency.

  An engine cooling device according to the present invention includes an electric heater unit for heating cooling water in a cooling water passage of a multi-cylinder in-line engine, wherein a water pump is arranged at one end in the cylinder row direction of the engine. A water outlet part of the water jacket of the engine body is provided at the end, and a cabin heater passage for guiding cooling water to the cabin heater unit for heating the passenger compartment is connected to the water outlet part, and is disposed on the intake side surface of the engine body. An extension portion of the cabin heater return passage connecting the outlet of the cabin heater unit to the water pump is arranged below the intake unit in the cylinder row direction, and the cylinder is placed in the extension portion of the heater return passage below the intake unit. An electric heater unit for cooling water heating is installed in a long arrangement in the row direction, and the electric heater unit is installed in the engine. And wherein the fixed support to the body.

  A low-voltage electric heater unit that uses a vehicle battery as a power source requires a longer heating wire to secure the amount of heat generated, and it is necessary to arrange several wires in parallel. A large electric heater unit can be arranged using the space below the intake unit, and the cabin heater return passage can also be arranged compactly. In addition, the electric heater unit for heating the cooling water is installed in the cabin heater return passage through which the cooling water cooled to low temperature is removed by the cabin heater, resulting in a large temperature difference and heat exchange. Efficiency is improved.

  And this apparatus arrange | positions the oil filter unit provided with the oil-water heat exchanger especially to the side of the electric heater unit, and arranged the oil filter in series with the electric heater unit on the upstream side of the electric heater unit in the cabin heater return passage. It is preferable that the units are connected.

  The oil-water heat exchanger (oil cooler) of the oil filter unit functions as a warmer when it is cold and takes heat away from the cooling water. For this reason, an oil filter unit is arranged upstream of the electric heater unit, and the cooling water that has been deprived of heat by the oil filter unit is allowed to flow to the electric heater unit, thereby further increasing the temperature difference and improving the heat exchange efficiency. Further improvement.

  In addition, the electric heater unit includes a casing that is long in the axial direction and has connecting portions with cooling water passages at both ends, and a heating wire that is accommodated in the casing and extends in the axial direction of the casing. One end of the heating wire is fixedly supported in an electrically insulated state via a support device that also serves as an energization unit connected to the on-vehicle power supply, and the other end is caged via a support device that also serves as a temperature detection type current-carrying-off unit. It is good to have a structure that is fixedly supported on the surface.

  With this configuration, the electric heater unit can be lengthened in the longitudinal direction of the cabin heater return passage to increase the amount of heat generation, and can have a double-end support structure that is resistant to vibration, and an electric heater is required. As described above, when the temperature becomes high, the energization is cut off to prevent overheating.

  The support device that also serves as the energization interruption unit includes a box and a bimetallic or fuse energization interruption member built in the box, and the box supports the heating wire and is fixed to the casing. It is good to have a configuration.

  This makes it easy to prevent overheating, and also facilitates support of both ends of the heating wire.

  In addition, the electric heater unit may be configured such that a support device that also serves as an energization interruption unit is disposed on the downstream side, and a support device that also serves as an energization unit connected to the on-vehicle power source is disposed on the upstream side.

By disposing a support device that also serves as an energization interruption unit in this way on the downstream side,
The abnormal temperature detection of the cooling water becomes easy, and the current can be cut off accurately to prevent overheating.

  As described above, the engine cooling apparatus according to the present invention can arrange a large electric heater unit at a low voltage by using the space below the intake unit, and the electric heater unit for heating the cooling water is interposed in the cabin heater return passage. By installing, the temperature difference can be increased and the heat exchange efficiency can be improved.

  The engine cooling device according to the present invention has an oil filter unit disposed upstream of the electric heater unit, and the cooling water deprived of heat by the oil filter unit flows into the electric heater unit, so that the temperature difference Can be further increased, and the heat exchange efficiency can be further improved.

  The engine cooling device according to the present invention is a support device in which one end of a heating wire is fixedly supported in an electrically insulated state by caging through a support device that also serves as an energization unit, and the other end also serves as a temperature detection type energization interruption unit. It is possible to lengthen the cabin heater return passage in the longitudinal direction to increase the amount of heat generated, and to have a support structure that is resistant to vibration, and an electric heater is more than necessary. When the temperature becomes too high, the power supply can be cut off to prevent overheating.

  Further, the engine cooling device of the present invention has a structure in which a box body containing a bimetallic or fuse-type current-carrying member of a support device that also serves as a current-carrying-off unit supports a heating wire and is fixed to the casing of the electric-heater unit. By doing so, it is easy to take measures against overheating, and it is easy to support both ends of the heating wire.

  In addition, the cooling device for the engine according to the present invention is configured so that the support device that also serves as the power cut-off unit supports the heating wire on the downstream side, thereby making it possible to easily detect the abnormal temperature of the cooling water and to prevent overheating. Therefore, it is possible to accurately cut off the power.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 to 4 show an example of an embodiment of the present invention. FIG. 1 is a perspective view of the engine, FIG. 2 is a side view of the engine, and FIG. 3 is a top view (a), a side view (b), a longitudinal sectional view (c), and a sectional view taken along the line AA of FIG. 4) FIG. 4 is a longitudinal sectional view (a), a BB sectional view (b), and a CC sectional view (c) of the supporting device that also serves as an energization interruption unit of the electric heater unit.

  The engine 1 of this embodiment shown in FIGS. 1 and 2 is a four-cylinder in-line engine, and includes a water pump that supplies cooling water to a water jacket (not shown) of a cylinder block 2 and a cylinder head 3 constituting the engine body. A built-in water pump housing portion 4 (see FIG. 2) is formed on the intake side of the front end portion (one end portion in the cylinder row direction) of the cylinder block 2. Further, a water outlet portion 5 constituting an outlet of the water jacket is provided at the rear end portion (the other end portion in the cylinder row direction) of the cylinder head 3, and a cabin heater unit (not shown) for heating the passenger compartment is provided in the water outlet portion 5. The piping hose 6 of the cabin heater passage that guides the cooling water is connected.

  The intake manifold 7 is connected to the intake side surface of the cylinder head 3, and the entire intake unit 9 from the intake manifold 7 to the upstream throttle body 8 is connected to the intake side surface of the engine body (cylinder block 2 and cylinder head 3). It is arranged along.

  An electric heater unit 10 is disposed below the intake unit 9 so as to extend in the cylinder row direction. Further, an oil filter unit 12 including an oil-water heat exchanger (oil cooler) 11 is disposed on the side of the electric heater unit 10 at a position near the cylinder block 2.

  And the piping hose 13 of the cabin heater return passage connected to the outlet of the cabin heater unit (not shown) extends to the lower part of the intake unit 9, and the oil filter unit 12 and the electric heater unit are provided in the extended portion. Are connected in series with an arrangement in which the oil filter unit 12 is on the upstream side and the electric heater unit 10 is on the downstream side.

  The cooling water passage of the engine 1 introduces cooling water into the water jacket of the cylinder block 2 from the water pump on the intake side at the front end of the engine, and the cooling water flowing through the water jacket of the cylinder block 2 passes through the communication passage to the cylinder head 3. Water pump (water pump housing) through the water outlet 5 through a radiator circulation passage (not shown), and through a cabin heater passage (piping hose 6) and a radiator bypass passage (not shown). It is configured to circulate to the inflow side of part 4).

  As shown in FIG. 3, the electric heater unit 10 is cylindrical and includes a casing 16 that is long in the axial direction and has connecting portions 14 and 15 with cooling water passages at both ends, and a plurality of rows (in the axial direction within the casing 16 ( In the example shown in the figure, there are five rows, but the number of rows can be changed as appropriate.) Heating wires (seeds wires) 17 extending in parallel are accommodated.

  Each heating wire 17 is fixedly supported by the casing 16 in an electrically insulated state via a support device 18 disposed on the upstream side of the casing 16 so as to serve as an energization unit connected to the on-vehicle power source, and the other end of the heating wire 17. In addition, it is fixedly supported by the casing 16 via a support device 19 that also serves as a temperature detection type current-carrying-off unit and is arranged on the downstream side of the casing 16.

  The electric heater unit 10 is fixedly supported on the cylinder block by bolt fixing means (not shown) at the casing 16.

  The support device 18 also serving as an energization unit has a box body 20, and a screw cylinder portion 21 formed on the upper portion of the box body 20 is fitted into a hole 22 on the upper surface of the casing 16 and fixed by a nut 23.

  As shown in FIG. 4, the support device 19 that also serves as a power cut-off unit includes a box body 24 and a current cut-off member 25 built in the box body 24 (the example shown is a bimetal type. Etc.). The heating wire 17 is supported at the lower portion of the box body 24, and the screw cylinder portion 26 formed at the upper portion of the box body 24 is fitted into the hole 27 on the upper surface of the casing 16 and fixed by the nut 28. The energization interruption member 25 interrupts energization when the temperature of the heating wire 17 becomes abnormally high.

  As mentioned above, although an example of embodiment was explained, it cannot be overemphasized that this invention is not limited to this but can be implemented in various aspects.

It is a perspective view of an engine concerning an example of an embodiment of the invention. 1 is a side view of an engine according to an example of an embodiment of the present invention. They are the top view (a), side view (b), longitudinal cross-sectional view (c), and its AA cross-sectional view (d) of the electric heater unit in an example of embodiment of this invention. It is the longitudinal cross-sectional view (a) of the support apparatus which served as the electricity supply interruption | blocking unit of the electric heater unit of FIG. 3, its BB sectional drawing (b), and CC sectional drawing (c).

Explanation of symbols

1 Engine 2 Cylinder block (Engine body)
3 Cylinder head (engine body)
4 Water pump housing (water pump)
5 Water outlet 6 Piping hose for cabin heater passage 7 Intake manifold 9 Intake unit 10 Electric heater unit 11 Oil / water heat exchanger (oil cooler)
12 Oil filter unit 13 Piping hose of cabin heater return passage 14, 15 Connection portion with cooling water passage 16 Caging 17 Heating wire (seeds wire)
DESCRIPTION OF SYMBOLS 18 Supporting device that also serves as an energization unit 19 Supporting device that also serves as a temperature detection type energization interruption unit 24 Box 25 Energization interruption member

Claims (5)

An engine cooling device in which an electric heater unit for heating cooling water is arranged in a cooling water passage of a multi-cylinder serial engine, wherein a water pump is arranged at one end in the cylinder row direction of the engine, and the engine main body is arranged at the other end A water outlet portion of the water jacket is provided, a cabin heater passage for guiding cooling water to the cabin heater unit for heating the passenger compartment is connected to the water outlet portion, and an intake unit disposed on the intake side surface of the engine body An extended portion of the cabin heater return passage connecting the outlet of the cabin heater unit to the water pump is disposed below in the cylinder row direction, and the extended portion of the heater return passage below the intake unit is disposed in the cylinder row direction. An electric heater unit for heating the cooling water is installed in a long arrangement, and the electric heater unit is fixed to the engine body. Cooling system for an engine, characterized in that the support was. An oil filter unit having an oil-water heat exchanger is arranged on the side of the electric heater unit, and the oil filter unit is connected in series with the electric heater unit on the upstream side of the electric heater unit in the cabin heater return passage. The engine cooling device according to claim 1, wherein The electric heater unit includes a casing that is long in the axial direction and has connecting portions with cooling water passages at both ends, and an electric heating wire that is accommodated in the casing and extends in the axial direction of the casing. One end of the heating wire is fixedly supported in an electrically insulated state through the support device also serving as an energization unit connected to the on-vehicle power source, and the other end is supported via a support device also serving as a temperature detection type current interruption unit. The engine cooling device according to claim 1 or 2, wherein the engine is fixedly supported by the caging. The support device that also serves as the current-carrying-off unit includes a box and a bimetal-type or fuse-type current-carrying member built in the box, and the box supports the heating wire and is fixed to the caging. The engine cooling apparatus according to claim 3, wherein the engine cooling apparatus is configured as described above. 5. The engine according to claim 3, wherein a support device that also serves as the current-carrying-off unit is disposed on a downstream side, and a support device that also serves as a current-carrying unit connected to a vehicle-mounted power source is disposed on the upstream side. Cooling system.

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