JP2007177771A - Engine cooling water pump device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an engine cooling water pump device of a simple structure by providing a vibration isolation seal part with both of a vibration isolation function and a seal function. <P>SOLUTION: The engine cooling water pump device 10 directly mounted on an engine is provided with a motor part 24 including a stator 20 and a rotor 22, a circuit part 26 for driving the motor part 24, and a housing part 30 constructing a part of a pump case 34 and fixed on a depressed part 32 of a timing chain cover. A blade part 50 is provided on the rotor 22 as one unit. Also, the vibration isolation seal part 44 sealing a pump chamber 42 in which liquid flows and having vibration isolation function, and a vibration isolation bushing part 46 fixing the housing part 30 to the depressed part 32 and having vibration isolation function are provided. Elastic forces of the vibration isolation seal part 44 and the vibration isolation bushing part 46 balance out. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an engine cooling water pump device directly attached to an engine.

  An engine cooling water pump device directly attached to an engine is known. In this direct-mounted engine cooling water pump device, vibration is generally damped by providing an anti-vibration rubber at the mounting portion.

  By the way, if this anti-vibration rubber also serves to seal the liquid used in the pump, the pump structure can be simplified.

However, this structure is not realized because the liquid easily leaks from the seal due to vibration. For this reason, the current situation is that the anti-vibration rubber is used only for vibration damping.
JP 2004-162541 A

  In view of the above facts, an object of the present invention is to provide an engine cooling water pump device in which the structure is simplified by providing an anti-vibration seal portion having both functions of anti-vibration and seal.

  The invention according to claim 1 is an engine cooling water pump device that is directly attached to an engine, a motor unit having a stator and a rotor, a circuit unit for driving the motor unit, and a rotor of the motor unit. An impeller that rotates by rotational driving, a housing part that constitutes at least a part of the pump case and is fixed to a fixed part of the engine, and a pump chamber seal that is provided so as to surround the impeller and through which the liquid flows. An anti-vibration seal portion having an anti-vibration function and an anti-vibration bush portion having an anti-vibration function while fixing the housing portion to the fixed portion, the anti-vibration seal portion and the anti-vibration bush portion The elastic force of each other is balanced.

  In the first aspect of the present invention, the arrangement position, the strength, and the like of the anti-vibration seal portion and the anti-vibration bush portion are set so that the mutual elastic force (reaction force when mounted on the vehicle) is balanced.

  Accordingly, the anti-vibration seal portion and the anti-vibration bush portion can be made to perform both functions of the anti-vibration and the seal without making the anti-vibration seal portion and the anti-vibration bush portion large. It can be set as a water pump apparatus.

  In the first aspect of the invention, the pump case wall may be directly attached to the engine wall, or the pump case may be directly attached to the engine wall.

  The invention according to claim 2 is characterized in that the fixed portion is a recess formed in a constituent member of the engine so that the impeller can be accommodated.

  Thereby, it can be set as the structure where the said recessed part comprises a pump chamber. Therefore, the replacement of the mechanical pump (mechanical engine cooling water pump device) with the electric pump (electric engine cooling water pump device) can be performed without making a significant change in the vehicle structure.

  The invention according to claim 3 is characterized in that the constituent member is a timing chain cover (engine chain case).

  As a result, the existing pump chamber set in the timing chain cover can be used as it is.

  The invention according to claim 4 is characterized in that the anti-vibration seal part and the anti-vibration bush part are arranged on a virtual plane passing through the center of gravity of the apparatus.

  Thereby, even if the engine cooling water pump device is directly attached to the engine, it is easy to reduce the influence of vibration. Therefore, the impeller (blade part) and the rotor can be cantilevered at the housing part, and a simpler and smaller engine cooling water pump device can be obtained.

  The invention according to claim 5 is characterized in that a flange portion is further provided on the outer peripheral side of the vibration-proof seal portion, and the vibration-proof bush portion is disposed on the flange portion.

  In the invention according to claim 5, the engine cooling water pump device can be attached to the engine by the flange portion. As a result, the resonance can be easily relaxed, and the influence of vibration caused by direct mounting of the engine can be further reduced. Therefore, the impeller (blade part) and the rotor can be easily cantilevered.

  Hereinafter, embodiments will be described and embodiments of the present invention will be described. As shown in FIG. 1, an engine cooling water pump device 10 according to an embodiment of the present invention is a device that is directly attached to an engine. A timing chain 14 and an oil pump 16 are accommodated inside (engine side) a timing chain cover (engine chain case) 12 that is a constituent member of the engine. In the present embodiment, the engine cooling water pump device 10 is attached to the outside of the timing chain cover 12.

  As shown in FIGS. 2 and 3, the engine cooling water pump device 10 includes a motor unit 24 having a stator 20 and a rotor 22, and a circuit unit 26 for driving the motor unit 24.

  The engine cooling water pump device 10 includes a housing portion 30 that holds the motor portion 24 and the circuit portion 26. The housing part 30 constitutes a part of the pump case 34 and is fixed to the fixed part of the engine. The fixed portion is a recess 32 formed in the timing chain cover 12 and capable of accommodating a blade portion 50 described later.

  A core (stator) 38 and a core seal portion 40 (see also FIG. 3) sealed so as to cover the core 38 are provided inside the housing portion 30 (the side accommodating the rotor 22). ing. The housing portion 30, the core seal portion 40, and the recess 32 form a pump chamber 42 through which a cooling liquid flows. The rotor 22 is accommodated in the pump chamber 42.

  Further, the engine cooling water pump device 10 includes an anti-vibration seal portion 44 and an anti-vibration bush portion 46.

(Motor part)
The rotor 22 is integrally provided with a blade portion (impeller) 50 that rotates by rotational driving. The rotor 22 includes a magnet (rotor) 52 for receiving a rotational force from the core 38. Further, the rotor 22 is provided with a rotating shaft 54 and a rotating shaft holding portion 56 that holds the rotating shaft 54. The rotating shaft 54 is rotatably held by the stator 20, and the rotor 22 is held in a cantilever structure.

  The open side of the motor unit 24 is the engine side, and the motor unit 24 is exposed by removing the engine cooling water pump device 10 from the timing chain cover 12.

(Circuit part)
The circuit unit 26 includes a circuit board 60 and a circuit lid 62 that holds the circuit board 60. The circuit lid 62 is detachably attached to the housing part 30. The circuit lid 62 forms the outside of the pump case 34 in a state where the engine cooling water pump device 10 is attached to the recess 32.

  The circuit unit 26 further includes a circuit chamber 66 in which an element (electronic component) 64 disposed on the circuit board 60 is accommodated. The core 38 is connected to the circuit board 60 by a wiring 39 that penetrates the housing portion 30.

  The circuit chamber 66 is juxtaposed with the motor unit 24 so as to be positioned above the motor unit 24 in a state where the engine cooling water pump device 10 is attached to the recess 32.

  Thus, the circuit chamber 66 is arranged in parallel on the side of the rotation axis of the motor unit 24 (side side), not on the side of the motor unit 24 in the rotation axis direction (rotation axis vertical side). Thereby, the thickness of the pump case 34 can be significantly reduced, and the thin engine cooling water pump device 10 can be obtained. This is particularly effective in improving the mountability when there is not enough space in the motor axis direction at the site of the mechanical pump (the zone where the mechanical engine cooling water pump device is disposed).

  When the engine cooling water pump device 10 is attached to the recess 32, the circuit lid 62 forms the outside of the pump case 34 and is detachable. Thereby, even if a failure occurs in the circuit unit 26, maintenance can be performed without removing the engine cooling water pump device 10, and maintenance work can be performed efficiently in a short time. Moreover, since the open side of the motor unit 24 is the engine side, it is not necessary to open the motor unit 24 when opening the circuit lid 62. This is effective in efficiently performing the maintenance work in a shorter time.

  The circuit unit 26 is positioned above the motor unit 24 in a state where the engine cooling water pump device 10 is attached to the recess 32. Accordingly, even if the seal of the vibration-proof seal portion 44 is insufficient and the liquid leaks, the liquid moves downward, so that the liquid does not reach the circuit portion 26 and the circuit It is avoided that the part 26 is damaged by this liquid.

(Anti-vibration seal and anti-vibration bush)
The anti-vibration seal part 44 is provided so as to surround the periphery of the blade part 50, and seals the pump chamber 42 and has an anti-vibration function. The vibration isolating bushing 46 fixes the housing 30 to the recess 32 and has a vibration isolating function. The vibration-proof seal portion 44 and the vibration-proof bushing portion 46 are set in the arrangement position, strength, and the like so that their elastic forces are balanced.

  In the present embodiment, the housing portion 30 has a flange portion 31 for attaching the engine cooling water pump device 10 to the engine on the outer peripheral side of the vibration-proof seal portion 44. The anti-vibration seal portion 44 and the anti-vibration bush portion 46 are disposed on the flange portion 31. Further, the arrangement position of the flange portion 31 is set in advance so that the anti-vibration seal portion 44 and the anti-vibration bush portion 46 are arranged on a virtual plane S passing through the center of gravity of the engine cooling water pump device 10. Yes.

  The vibration-proof seal portion 44 includes an O-ring rubber 70 and a groove 72 that is formed in the flange portion 31 and accommodates the O-ring rubber 70.

  A plurality of through holes 74 are formed in the flange portion 31. The number of the through holes 74 is the same as the number of male screws 76 necessary for fixing the flange portion 31 to the recess 32. The anti-vibration bush portion 46 includes a bush-like rubber 80 that holds the collar 78 inside.

  And the elastic force (reaction force at the time of vehicle mounting) of the O-ring-like rubber 70 and the bush-like rubber 80 is balanced with each other. That is, the reaction force F1 received by the bush-like rubber 80 and the reaction force F2 received by the O-ring rubber 70 are the same.

  As described above, in the present embodiment, the mutual elastic force (reaction force when mounted on the vehicle) of the anti-vibration seal portion 44 and the anti-vibration bush portion 46 is balanced. Therefore, the anti-vibration seal portion 44 can perform both functions of anti-vibration and sealing without making the anti-vibration seal portion 44 and the anti-vibration bush portion 46 large. Thereby, it can be set as the engine cooling water pump apparatus 10 which aimed at the simplification of a structure.

  Further, the concave portion 32 is used as a part of the pump case 34, and the blade portion 50 is accommodated in the concave portion 32. That is, when viewed from the vehicle side, the existing pump chamber set in the timing chain cover (engine chain case) 12 can be used as it is. Therefore, it is possible to replace the component (replacement with the engine cooling water pump device 10) without making a significant change in the vehicle structure, and the cost is greatly reduced from a total viewpoint. In addition, the amount of the housing member constituting the pump chamber 42 can be greatly reduced.

  Further, the anti-vibration seal portion 44 and the anti-vibration bush portion 46 are disposed on a virtual plane S that passes through the center of gravity of the engine cooling water pump device 10. Thereby, even if the engine cooling water pump apparatus 10 is directly attached to the engine, it is easy to reduce the influence of vibration. Therefore, the rotor 22 in which the blade portion 50 is integrally provided can be made a cantilever structure with the stator 20 of the housing portion 30, and is made simpler and smaller.

  The engine cooling water pump device 10 is attached to the timing chain cover 12 by a flange portion 31. As a result, resonance is easily relaxed, and the influence of vibration due to direct attachment of the engine is further reduced. Therefore, the blade part 50 and the rotor 22 are easily cantilevered.

  The embodiments of the present invention have been described with reference to the embodiments. However, the above embodiments are merely examples, and various modifications can be made without departing from the scope of the invention. Needless to say, the scope of rights of the present invention is not limited to the above embodiment.

It is a development perspective view showing that an engine cooling water pump device concerning one embodiment of the present invention is attached to an engine. It is a typical side sectional view showing the composition of the engine cooling water pump device concerning one embodiment of the present invention. FIGS. 3A to 3C are a plan view, a side view, and a rear view, respectively, showing an example of the engine cooling water pump device according to the embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Engine cooling water pump apparatus, 12 ... Timing chain cover, 20 ... Stator, 22 ... Rotor, 24 ... Motor part, 26 ... Circuit part, 30 ... Housing part, 31 ... Flange part, 32 ... Recessed part, 34 ... Pump case 42 ... Pump chamber, 44 ... Anti-vibration seal part, 46 ... Anti-vibration bush part, 50 ... Vane part (impeller)

Claims (5)

An engine cooling water pump device directly attached to the engine,
A motor unit having a stator and a rotor;
A circuit unit for driving the motor unit;
An impeller that rotates by rotating the rotor of the motor unit;
A housing part that constitutes at least a part of the pump case and is fixed to a fixed part of the engine;
An anti-vibration seal part that is provided so as to surround the impeller and seals the pump chamber through which the liquid flows and has an anti-vibration function;
An anti-vibration bush portion for fixing the housing portion to the fixed portion and having an anti-vibration function;
With
An engine cooling water pump device characterized in that the elastic forces of the anti-vibration seal part and the anti-vibration bush part are balanced.   The engine cooling water pump device according to claim 1, wherein the fixed portion is a recess formed in a constituent member of the engine so as to accommodate the impeller.   The engine cooling water pump device according to claim 2, wherein the structural member is a timing chain cover.   4. The engine cooling water pump device according to claim 2, wherein the anti-vibration seal portion and the anti-vibration bush portion are arranged on a virtual plane passing through the center of gravity of the device.   The engine cooling water pump device according to claim 4, wherein a flange portion is further provided on an outer peripheral side of the vibration-proof seal portion, and the vibration-proof bushing portion is disposed on the flange portion.

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