JP4602902B2 - Engine cooling water pump device - Google Patents

Description

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

  In a brushless type water pump device, a pump unit, a motor unit, and a circuit unit are generally arranged side by side in the direction of the rotation axis of the motor unit.

However, the engine cooling water pump device directly attached to the engine is a device that is long in the direction of the rotation axis of the motor unit (vertical direction of the device) in this conventional configuration, and the rotation of the motor unit depends on the installation space and the like. There has been a demand for a thin engine cooling water pump device having a reduced axial thickness.
JP 2004-162541 A

  In view of the above fact, an object of the present invention is to provide a thin engine cooling water pump device.

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 rotation driving, and a housing part that constitutes at least a part of the pump case and is fixed to a fixed part of the engine, wherein the rotation axis direction of the motor part is the apparatus thickness direction, The circuit section and the motor section are provided side by side in the rotation axis direction, and the circuit chamber that houses the electronic components in the circuit section is located above the motor section in a state where the housing section is fixed to the fixed section. so as to be located, said being positioned radially outward of the motor unit, between said circuit portion and the motor portion, a portion of the housing portion is disposed In openable side is the engine side of the motor section, side openable of the circuit chamber is characterized in that the engine side which is opposite.

  Thereby, it can be set as the engine cooling water pump apparatus thinned thinly in the thickness direction of the motor part.

  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 1 is characterized in that the circuit chamber is located above the motor portion in a state where the housing portion is fixed to the fixed portion.

As a result, even if the sealing of the liquid flowing through the pump is insufficient and the liquid leaks, the liquid moves downward, so that the liquid does not reach the circuit chamber and the circuit chamber This liquid completely prevents the failure .

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 as to be able to accommodate the impeller.

  Thereby, it can be set as the structure where the said recessed part comprises the pump chamber through which a liquid flows. 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.

  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. In the state where the engine cooling water pump device 10 is attached to the recess 32, the circuit lid 62 is configured such that the openable side of the motor unit 24 is the engine side and the openable side of the circuit unit 26 (that is, the circuit lid 62 is attached). Is the opposite side to the engine side. Thereby, even if a failure occurs in the circuit section 26, maintenance can be performed without removing the engine cooling water pump device 10.

  The circuit unit 26 further includes a circuit chamber 66 in which an element (an electronic component such as a control element) 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 arranged side by side on the side of the motor unit 24 (the side of the rotating shaft), not on the side of the motor unit 24 in the direction of the rotating shaft (vertical side of the rotating shaft). Thereby, the thickness of the pump case 34 is greatly reduced, and the thin engine cooling water pump device 10 is obtained.

  Further, the circuit chamber 66 is arranged in parallel to 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. Thereby, even if the seal such as the anti-vibration seal portion 44 becomes insufficient and the liquid leaks, the liquid moves downward, so that the liquid does not reach the circuit portion 26. It is completely avoided that the circuit 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.

  In this way, the anti-vibration seal portion 44 and the anti-vibration bush portion 46 have a large structure by balancing the elastic force (reaction force when mounted on the vehicle) of the anti-vibration seal portion 44 and the anti-vibration bush portion 46. Therefore, the anti-vibration seal portion 44 can perform both functions of anti-vibration and sealing. Therefore, the engine cooling water pump device 10 with a simplified structure can be obtained.

  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.

  As described above, in the present embodiment, the circuit chamber 66 is arranged in parallel on the side of the rotation axis of the motor unit 24 (side) rather than on the side of the motor unit 24 in the direction of the rotation axis (vertical side of the rotation axis). Yes. 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).

  Furthermore, since the rotor 22 can be cantilevered with the stator 20 of the housing portion 30, the rotating shaft 54 can be shortened, contributing to further thinning of the apparatus.

  In the state where the engine cooling water pump device 10 is attached to the recess 32, the openable side of the motor part 24 is the engine side, and the openable side of the circuit part 26, that is, the side where the circuit lid 62 is attached is the engine side. It is on the opposite side. The circuit lid 62 is detachable from the housing part 30. 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. As a result, even if the sealing of the pump chamber or the like is insufficient and the liquid (for example, LLC) leaks, the liquid moves downward, so that the liquid does not reach the circuit unit 26. The circuit part 26 is prevented from being damaged by this liquid.

  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.

  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.

  As shown in FIG. 4, a circuit chamber 86 larger than the circuit chamber 66 (see FIG. 2) may be provided by devising the positions of the vibration isolation seal portion and the vibration isolation bush portion. As a result, the engine cooling water pump device 90 can be provided in which the dispositionable zone of the element 64 is further increased.

  Further, as shown in FIG. 5, the engine cooling water pump device 100 in which the cooling fins 94 protrude from the engine side may be used with the arrangement of the motor unit, the pump chamber, and the circuit unit being the same as in the above embodiment.

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

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. It is typical side surface sectional drawing which shows the structure of the modification of the engine cooling water pump apparatus which concerns on one Embodiment of this invention. It is a perspective view which shows the structure of another modification of the engine cooling water pump apparatus which concerns on one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Engine cooling water pump apparatus, 12 ... Timing chain cover (component), 20 ... Stator, 22 ... Rotor, 24 ... Motor part, 26 ... Circuit part, 30 ... Housing part, 32 ... Recessed part, 34 ... Pump case, DESCRIPTION OF SYMBOLS 50 ... Blade | blade part (impeller), 64 ... Element (electronic component), 66 ... Circuit room, 86 ... Circuit room, 90 ... Engine cooling water pump apparatus, 100 ... Engine cooling water pump apparatus

Claims (2)

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;
With
The rotation axis direction of the motor part is the apparatus thickness direction,
The circuit unit and the motor unit are provided side by side in the rotation axis direction,
Circuit chamber accommodating the electronic components in the circuit portion is in a state of fixing the housing portion to the fixed portion, so as to be positioned above the motor unit, is positioned radially outward from said motor unit And
A part of the housing part is arranged between the circuit part and the motor part,
The engine cooling water pump device according to claim 1, wherein the openable side of the motor unit is an engine side, and the openable side of the circuit chamber is a side opposite to the engine side. 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 .

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