JPH082423Y2 - Driving force transmission device for water pump for automobile engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) A drive force transmission device for a water pump for an automobile engine according to the present invention drives a water pump for circulating cooling water of an automobile engine by the engine. Regarding the improvement of the structure of the part.

(Prior Art) In the case of a water-cooled automobile engine, heat is radiated by a radiator and the cooling water whose temperature has dropped is sent to a water jacket by a water pump to cool the engine whose temperature has risen due to combustion of fuel. In order to drive such a water pump for sending the cooling water, it has been customary in the past to rotationally drive the drive shaft of the water pump via the V-belt by the crankshaft of the engine.

However, in the case of the conventional mechanism for driving the water pump, since the crankshaft of the engine and the drive shaft of the water pump are mechanically coupled, the engine speed and the impeller fixed to the drive shaft of the water pump are fixed. 2 becomes proportional as shown by the solid line in FIG. 2, and the amount of cooling water discharged from the water pump increases in proportion to the engine speed regardless of the temperature of the cooling water. Will end up.

A valve that opens and closes due to the action of a thermostat is provided in the middle of the cooling water circulation flow path, so that when the engine temperature is low, more cooling water will not be sent to the water jacket of the engine. If the impeller rotates faster than necessary, the power of the engine will be wasted, which is not preferable.

In order to eliminate such inconvenience, Japanese Patent Laid-Open No. 62-210287 discloses a combination of a fluid coupling and an electromagnetic clutch to drive a water pump through the fluid coupling when the cooling water temperature is low. So if the temperature of the cooling water is low,
Prevent the water pump from rotating faster than necessary,
While preventing unnecessary waste of engine power,
When the temperature of the cooling water rises, the electromagnetic clutch is engaged so that the rotation of the impeller of the water pump rises in proportion to the rotation of the engine.

(Problems to be Solved by the Invention) However, in the case of the structure described in the above publication, the number of constituent parts is large, and it is unavoidable that the parts management and the assembling work are complicated, and the manufacturing cost is increased.

The driving force transmission device for a water pump for an automobile engine according to the present invention solves the above-mentioned inconveniences by simplifying the structure.

(Means for Solving the Problems) A driving force transmission device for a water pump for an automobile engine according to the present invention includes a solenoid fixed to an outer peripheral surface of an end portion of a bearing housing and a water pump rotatably inserted in the bearing housing. A pulley rotatably supported on the outer peripheral surface of the end of the drive shaft via a bearing; and an inner coupling member rotatably supported on the outer peripheral surface of the end of the drive shaft via a bearing, The outer coupling member that is fixed to the outer peripheral surface of the end portion of the drive shaft and faces the inner coupling member through the viscous fluid to form a fluid coupling, and the outer coupling member that is fixed to the outer coupling member. The armature plate made of a magnetic material, which faces the solenoid through the solenoid plate, and the side surface of the armature plate that is attached to the portion facing the pulley. And a friction plate.

(Operation) The driving force transmission device for a water pump for an automobile engine of the present invention configured as described above operates as follows.

First, when the temperature of the cooling water is low, the solenoid is not energized and the friction plate attached to the armature plate is separated from the side surface of the pulley. As a result, the transmission of power from the pulley to the drive shaft of the water pump is performed via the fluid coupling composed of the inner coupling member and the outer coupling member, so the rotational speed of the drive shaft of the water pump is The rotation speed will be slower than that of the water pump, the impeller of the water pump will rotate faster than necessary, and the power of the engine will not be wasted.

When the temperature of the cooling water is high, by energizing the solenoid, the friction plate attached to the armature plate is attracted to the side surface of the pulley, and the pulley and the drive shaft of the water pump are mechanically coupled. As a result, the impeller of the water pump rotates in synchronization with the crankshaft of the engine and sends a sufficient amount of cooling water to the water jacket of the engine.

The above operation is basically the same as the invention described in the above publication, but in the case of the driving force transmission device for a water pump for an automobile engine of the present invention, the structure is simple,
Since the number of constituent parts is small, there is no trouble in parts management and assembly work, and the manufacturing cost can be reduced.

(Embodiment) Next, the present invention will be described in more detail with reference to the illustrated embodiment.

FIG. 1 is a half sectional view showing an embodiment of a driving force transmitting apparatus for a water pump for an automobile engine according to the present invention.

Reference numeral 1 denotes a bearing housing provided at an end portion of a water pump casing. An outer surface (left side surface in FIG. 1) of a circular ring-shaped support bracket 2 fixed to an outer peripheral surface of the end portion of the bearing housing 1 has a solenoid 3 Is supported and fixed.

A drive shaft 4 of a water pump is rotatably inserted inside the bearing housing 1, and an inner coupling member 6 is rotatably mounted on an outer peripheral surface of an end portion of the drive shaft 4 via a rolling bearing 5. Support. On the outer side surface (left side surface in FIG. 1) of the inner coupling member 6, a plurality of concentric cylindrical walls 8 are formed. Further, the base portion of the inner coupling member 6 (the right portion in FIG. 1)
A pulley 7 is externally fitted and fixed to the outer peripheral surface so that the inner coupling member 6 and the pulley 7 rotate in synchronization with the drive shaft 4.

An outer coupling member 9 is externally fitted and fixed to the outer peripheral surface of the end of the drive shaft 4 projecting from the externally fitted portion of the rolling bearing 5. On the inner side surface (right side surface in FIG. 1) of the outer coupling member 9, a plurality of concentric cylindrical walls 10, 10 are formed. The cylindrical walls 10, 10 are alternately combined with the cylindrical walls 8, 8 formed on the outer surface of the inner coupling member 6. In this way, in the state where both the cylindrical walls 8 and 10 are combined, a slight gap is present between the peripheral surfaces of the cylindrical walls 8 and 10.

As described above, the gap existing between the peripheral surfaces of the cylindrical walls 8 and 10 is filled with a viscous fluid such as silicone oil. However, the viscous fluid leaks to the outer cup. A seal member 11 supported on the inner peripheral surface of the ring member 9 and having its inner peripheral edge abutted on the outer peripheral surface of the inner coupling member 6, and a seal plate provided on the rolling bearing 5.
Prevented by 12 and.

As a result, the inner coupling member 6 and the outer coupling member 9 form a fluid coupling that transmits the rotational force while slipping.

On the other hand, on the inner side surface of the outer coupling member 9, an armature plate 13 formed in a ring shape is fixed by welding or the like by a magnetic material having elasticity such as a steel plate.
A friction plate 14 is attached to the inner surface of the amateur plate 13.

The amateur plate 13 is opposed to the solenoid 3 via a pulley 7, and when the solenoid 3 is not energized, the elastic force of the amateur plate 13 causes friction plates.
When the solenoid 14 is separated from the side surface of the pulley 7 and the solenoid 3 is energized, the friction plate 14 is brought into contact with the side surface of the pulley 7 due to elastic deformation of the armature plate 13.

The control of the solenoid 3 is also performed by a controller (not shown) based on a signal from a temperature sensor (not shown) that detects the temperature of the cooling water of the engine.

The driving force transmission device for a water pump for an automobile engine according to the present invention constructed as described above operates as follows.

First, when the temperature of the cooling water of the engine is low, the controller does not energize the solenoid 3 based on the signal from the temperature sensor, so that the friction plate 14 attached to the armature plate 13 is It is separated from the side surface of the pulley 7 by the elasticity.

As a result, the rotation of the pulley 7 is not transmitted to the armature plate 13, and the power is transmitted from the pulley 7 to the drive shaft 4 of the water pump by the inner coupling member 6
And an outer coupling member 9 are used for the fluid coupling. In the transmission of power by the fluid coupling, the loss increases as the rotational speed increases, so the rotational speed of the drive shaft 4 of the water pump is shown in FIG. 2 as the rotational speed of the crankshaft of the engine increases. It changes as shown by the broken line. That is, when the rotation speed of the engine increases to some extent or more, the rotation speed of the drive shaft 4 of the water pump does not increase even if the rotation speed of the pulley 7 that rotates in synchronization with the crankshaft of the engine increases. The impeller incorporated in this water pump will not rotate faster than necessary, and the power of the engine will not be wasted.

When the temperature of the cooling water is high, the controller energizes the solenoid 3 based on the signal from the temperature sensor, and the armature plate 13 is attracted to the solenoid 3 side, so that the armature plate 13 is elastically moved. The friction plate 14 attached to the inner surface of the amateur plate 13 is brought into contact with the side surface of the pulley 7 to mechanically connect the pulley 7 and the drive shaft 4 of the water pump.

As a result, the impeller of the water pump rotates in synchronization with the crankshaft of the engine and sends a sufficient amount of cooling water to the water jacket of the engine.

The above operation is basically the same as the invention described in the above publication, but in the case of the driving force transmission device for a water pump for an automobile engine of the present invention, the structure is simple and the number of components is small. Since there are few, there is no trouble in parts management and assembly work, and the production cost can be reduced.

(Effects of the Invention) Since the driving force transmission device for a water pump for an automobile engine of the present invention is configured and operates as described above, the power of the engine is not wasted and the engine can be sufficiently cooled. An engine cooling device can be provided at low cost.

[Brief description of drawings]

FIG. 1 is a half sectional view showing an embodiment of a driving force transmission device for a water pump for an automobile engine of the present invention, and FIG. 2 is a diagram showing a relationship between the engine speed and the water pump impeller speed. Is. 1: Bearing housing, 2: Support bracket, 3: Solenoid,
4: Drive shaft, 5: Rolling bearing, 6: Inner coupling member, 7: Pulley, 8: Cylindrical wall, 9: Outer coupling member, 10: Cylindrical wall, 11: Seal material, 12: Seal plate, 13:
Amateur plate, 14: Friction plate.

Claims (1)

[Scope of utility model registration request] 1. A solenoid fixed to an outer peripheral surface of an end portion of a bearing housing, and an outer peripheral surface of an end portion of a drive shaft of a water pump rotatably inserted in the bearing housing, the rotor being rotatably supported via a bearing. A pulley, an inner coupling member rotatably supported on the outer peripheral surface of the end of the drive shaft via a bearing, and an inner coupling member fixed to the outer peripheral surface of the end of the drive shaft and the inner cup via a viscous fluid. An outer coupling member that constitutes a fluid coupling by facing the ring member, an armature plate made of a magnetic material, which is fixed to the outer coupling member and faces the solenoid through the pulley, and the armature plate. A drive force transmission device for a water pump for an automobile engine, which comprises a friction plate attached to a portion facing the pulley on a side surface thereof.