JPS63235619A - Cooling device for engine starting motor - Google Patents

Abstract

PURPOSE:To effectively carry out the cooling of an engine starting motor and improve its operating characteristic by providing a passage for making part of an engine cooling liquid to flow on said engine starting motor while provided a solenoid valve which is controlled according to a cooling liquid temp. on said passage. CONSTITUTION:In an internal combustion engine 1, a cooling liquid in its water jacket 3 is introduced out into a radiator 5 via an upper hose 4 and, after carrying out cooling here, returned to the water jacket 3 via a lower hose 6. Also, pat of the cooling liquid in the water jacket 3 is taken out through a hose 17 to circulated in the cooling liquid passage in a staring motor 8. In this case, a solenoid valve 9 which is controlled to be closed via a control device 14 when a cooling liquid temp. which is detected by a sensor 13 reached a defined value is provided on the upper course side part of the hose 17. And, if the radiator 5 is broken causing the cooling liquid temp. to be abnormally increased, the solenoid valve 9 is closed to prevent abnormal heating of the members to be cooled of the starting motor 8.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cooling device for a starting motor for an engine such as an automobile.

[Conventional technology]

FIG. 2 is a schematic configuration diagram showing a conventional engine starter motor cooling device.

In Figure 2, (1) is the engine installed in the car, (
2) is the cylinder block that constitutes this engine, +3) is the water jacket provided around this cylinder block, (4) is the upper hose that guides the coolant heated in this water jacket to the radiator (51), (6) )
is a lower hose that leads the coolant cooled by the radiator (5) to the water jacket (31); (71 is a water pump installed between this lower hose and the water jacket (31) that applies pressure to the coolant and forcibly circulates it; (81 is a starter motor that drives the engine, and has a pinion (8a) that rotationally drives an engine gear (not shown). A part of the cooling liquid is circulated, cools the field core and field coil while flowing through the cooling liquid passage in the yoke, and then flows into the lower hose (61).

In the conventional device configured in this way, a part of the coolant of the engine +11 is stored in the cylindrical block (
The water jacket around 210 flows into the coolant passage in the starting motor (8), flows through this passage and cools the field core and field coil in the starting motor 181. It flows out into the discharge flow path from the radiator (51), that is, into the lower hose +61.A suction force acts on the discharged coolant due to the flow rate of the discharge flow from the radiator (51). Since the liquid is well circulated, the field core as well as the field coil are cooled.

[Problem that the invention seeks to solve]

In the conventional engine starter motor cooling system as described above,
If the amount of coolant decreases due to damage to the radiator (5) or the like, the engine will not be cooled sufficiently, causing the temperature of the engine to rise and the temperature of the coolant to rise abnormally.

Even in this case, if the vehicle driver does not notice, the water pump (7) supplies high-temperature coolant or high-temperature gas resulting from evaporation of the coolant into the coolant passage in the starting motor (8). A problem has arisen in which the cooling effect of the core and field coil is reduced, and the core and field coil are not cooled at all but rather heated.

Conversely, even when the coolant in the engine 11+ is abnormally low in winter, the coolant flows through the coolant passage of the starting motor (8), reducing the exposure to the starting motor m tst. There was a problem that the cooling member was overcooled.

This invention was made to solve these problems, and when the temperature of the coolant becomes high or abnormally low, the coolant is not allowed to flow to the starting motor and the starting motor is stopped. It is an object of the present invention to provide a cooling device for an engine starting motor that reduces thermal effects on members to be cooled such as field coils.

[Means for solving problems]

The cooling device for an engine starting motor according to the present invention includes a sensor that detects the engine coolant temperature, and a passageway through which a portion of the coolant flows to the engine starting motor, and opening and closing are controlled according to the output of the sensor. A valve is provided.

[Effect]

The valve is opened and closed according to the temperature of the engine coolant, and the flow of the coolant to the starter motor is controlled, thereby preventing abnormal heating or cooling of the cooled components of the starter motor due to the coolant or high-temperature gas.

〔Example〕

FIG. 1 is a schematic diagram showing an embodiment of a cooling device for an engine starting motor according to the present invention.

In the figure, (9) is a solenoid valve installed in a hose that circulates the coolant from the water jacket (3) of the engine 11+ to the coolant passage in the starter motor (81),
It has a movable valve housing υ and a valve seat @. C13 is a water jacket (a sensor that detects the temperature of the coolant inside 13,
(1) takes the output of this sensor a3 as input, compares it with a preset value, and when the output of sensor a3 reaches a predetermined value, energizes the excitation coil OI, is a connection line connecting this control device I and the exciting coil αα, (Le is a connection line connecting the control device I and the sensor μ3.

In the embodiment configured in this way, the radiator (5) of the engine (1) is damaged, the coolant becomes low, and the engine 1
11 temperature rises and the coolant temperature rises abnormally (lUO
'c), the sensor (13) detects the temperature of the coolant and outputs it to the control device I via the connecting line.The control device I receives the output from the sensor 9 and sets the temperature. Since the sensor output exceeds the predetermined value compared to , current is supplied from the control device I to the exciting coil αO via the connection line (IcJ).

By energizing this excitation coil α1, the movable valve (iυ) is attracted to the valve seat (17J) by electromagnetic force, and the movable valve Uυ is attracted to the valve seat (1z and the valve (91) is held in the closed state.
As a result, the circulation of the coolant is blocked by the valve (91), so high temperature coolant or high temperature gas does not flow into the cooling groove passage in the starting electric motor 1m111, and the field core and field coil The temperature rise of the cooled members such as the above can be avoided.

In addition, in the above description, the solenoid valve (91) is replaced by the water jacket (3).
1 and the starting motor +81 are attached in the middle of the hose, but the starting motor 1! i! Inlet of the coolant passage in 181 or water jacket) 131
At the outlet to the starting electric motor @ 181 in K, there is a solenoid valve 19.
Even if 7 is attached, the same effect as the above embodiment can be achieved.

In addition, in the above description, the water jacket (31) of the engine (11) is exemplified to prevent the flow of the coolant into the starting motor +81 when the temperature of the coolant in the water jacket (31) rises, but the cooling in the water jacket (3) Even if the liquid level is abnormally low, the coolant may be prevented from flowing into the starter motor (81) to prevent overcooling of the parts to be cooled in the starter motor (81. Although a wire-wound type magnet is shown as an example, it is of course applicable to a permanent magnet type.

〔Effect of the invention〕

As described above, according to the present invention, there is provided a sensor for detecting the engine coolant temperature, and a valve whose opening and closing are controlled according to the output of the sensor, in the passage through which part of the coolant flows to the engine starting motor. By providing this, the flow of coolant to the engine starting motor can be controlled according to the temperature of the engine coolant.
It is possible to prevent a decrease in the cooling effect, abnormal heating, or overcooling of the cooled member of the engine starting motor.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention, vJ2
The figure is a schematic configuration diagram showing a conventional device. In the figure, (1) is the engine, (21 is the cylinder block, (3
) is the water jacket, (7) is the water pump, (
81 is an engine starting motor, +91 is a solenoid valve, (IQ is an excitation coil, time is a sensor, Q4) is a control device. In addition, the same symbols in each figure indicate the same or corresponding parts.

Claims (1)

[Claims] A passageway through which a part of the engine coolant flows to the engine starting motor, a sensor that detects the temperature of the engine coolant, and a valve provided in the passageway and whose opening and closing are controlled according to the output of the sensor. cooling system for engine starting motors.