JP2014109261A - Water pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water pump from which liquid stored in a liquid storage space is hard to be discharged outside.SOLUTION: A water pump has: a driving rotating body 1 drive-rotated by a drive mechanism E; a pump shaft 2 rotating by power transmission from the driving rotating body 1; a housing 3 in which the pump shaft 2 is inserted; an impeller 4 fixed to one end side of the pump shaft 2; an electromagnetic clutch 5 equipped with a clutch part 5a for turning on/off the power transmission from the driving rotating body 1 to the pump shaft 2 on the other end side of the pump shaft 2; a mechanical seal 6 attached across the pump shaft 2 and the housing 3 at a position between the impeller 4 and the clutch part 5a; and a liquid storage space 7 which can store liquid leaking out from the impeller 4 side to the clutch part 5a side via the mechanical seal 6. The electromagnetic clutch 5 is provided with a yoke 19 for holding an electromagnetic coil 18b. The liquid storage space 7 is formed in the housing 3 and the yoke 19 is abutted to the housing 3.

Description

  The present invention includes a drive rotating body that is driven and rotated by a drive mechanism, a pump shaft that is rotated by power transmission from the drive rotating body, a housing through which the pump shaft is inserted, and one end side of the pump shaft. An impeller, an electromagnetic clutch provided on the other end side of the pump shaft with a clutch portion for turning on and off the power transmission from the drive rotor to the pump shaft, and a position between the impeller and the clutch portion, A mechanical seal mounted across the pump shaft and the housing, and a liquid storage space capable of storing liquid leaked from the impeller side to the clutch part side through the mechanical seal. Further, the present invention relates to a water pump in which the electromagnetic clutch includes a yoke for holding an electromagnetic coil, and the liquid storage space is formed in the housing.

The mechanical seal mounted across the pump shaft and the housing prevents liquid leakage while relatively sliding the seal member fixed on the pump shaft side and the seal member fixed on the housing side.
For this reason, it is inevitable that liquid leaks from the impeller side to the clutch portion side through a slight gap between the seal members.

Patent Document 1 discloses a water pump in which a liquid storage space capable of storing such a liquid component is formed in the housing so that the liquid component leaking through the mechanical seal does not flow out of the housing. ing.
The housing is formed with an opening for opening the liquid storage space toward the yoke, and a cap for closing the opening is provided.
The cap is formed with a discharge hole through which the liquid accumulated in the liquid storage space can be discharged to the outside of the housing.
Then, the heat of the yoke heated by the heat generated by energizing the electromagnetic coil is conducted to the housing through the fixing bracket that fixes the yoke to the housing to heat the liquid storage space, and the liquid stored in the liquid storage space It is configured so that the minutes can be evaporated.
Accordingly, the liquid and the vapor accumulated in the liquid storage space can be discharged to the outside of the housing through the discharge hole formed in the cap.

JP 2010-242623 A

The water pump described in Patent Document 1 conducts the heat of the yoke heated by the heat generated by the electromagnetic coil to the housing through the fixed bracket. Therefore, before the heat of the yoke sufficiently heats the liquid reservoir space, It is easy to radiate heat to the outside.
For this reason, even if the heat of the yoke is conducted to the housing, the liquid storage space is not easily heated.
As a result, the amount of the liquid that can be evaporated in the liquid storage space is reduced, so that the liquid stored in the liquid storage space increases at an early stage and is easily discharged outside through the discharge hole.
If the liquid component stored in the liquid storage space is discharged to the outside through the discharge hole, there is a problem that it is misunderstood that there is a problem that the liquid component leaks unexpectedly from the pump due to the trace of the discharge.
The present invention has been made in view of the above circumstances, and an object thereof is to provide a water pump in which a liquid component accumulated in a liquid storage space is difficult to be discharged to the outside.

  A water pump according to a first aspect of the present invention includes: a drive rotator that is driven and rotated by a drive mechanism; a pump shaft that is rotated by power transmission from the drive rotator; a housing through which the pump shaft is inserted; An impeller fixed to one end of the pump shaft; an electromagnetic clutch provided with a clutch portion on the other end side of the pump shaft for switching power transmission from the drive rotating body to the pump shaft; and the impeller and the clutch portion Between the pump shaft and the housing, and a liquid component leaking from the impeller side to the clutch portion side through the mechanical seal can be stored. A liquid storage space, wherein the electromagnetic clutch includes a yoke for holding an electromagnetic coil, the liquid storage space is formed in the housing, and the yoke is disposed in front. In that in contact with the housing.

In the water pump of this configuration, the yoke is in contact with the housing.
For this reason, the heat which the yoke heated by the heat_generation | fever by electricity supply to an electromagnetic coil can be efficiently conducted to a housing, without passing through the member currently interposed between the yoke and the housing.
Therefore, with the water pump of this configuration, the temperature of the liquid storage space is likely to rise, and the amount of liquid that can be evaporated in the liquid storage space increases, so that an early increase of the liquid stored in the liquid storage space is suppressed. can do.
Therefore, it is difficult for the liquid component stored in the liquid storage space to be discharged to the outside, and it is difficult to cause the inconvenience that it is misunderstood that there is a problem that the liquid component leaks unexpectedly from the pump.

  According to a second characteristic configuration of the present invention, an opening that opens the liquid storage space toward the yoke is formed in the housing, and the yoke is disposed so as to close the opening. .

  With this configuration, the heat held by the yoke can be radiated to the liquid storage space without going through the housing, and the temperature increase of the liquid storage space can be promoted.

  The third characteristic configuration of the present invention is that an uneven portion is provided on a surface of the yoke facing the liquid storage space.

  With this configuration, the heat radiation area from the yoke to the liquid storage space can be increased.

  A fourth characteristic configuration of the present invention is that a lower portion of the liquid storage space is partitioned by a bottom surface that becomes lower toward the yoke.

  If it is this structure, the liquid component which flowed into the liquid storage space can be made to flow by the dead weight to the yoke side, and the evaporation can be accelerated | stimulated.

It is a longitudinal cross-sectional view which shows the water pump by this invention. It is the II-II sectional view taken on the line in FIG. It is a longitudinal cross-sectional view which shows 2nd Embodiment of the water pump by this invention.

Embodiments of the present invention will be described below with reference to the drawings.
[First Embodiment]
FIG. 1 shows a water pump P according to the present invention for circulating cooling water equipped in a vehicle engine (an example of a drive mechanism) E.

  The water pump P includes a drive pulley (an example of a drive rotator) 1 that is driven and rotated by an engine E, a pump shaft 2 that is rotated by power transmission from the drive pulley 1, and a pump housing 3 through which the pump shaft 2 is inserted. , An impeller 4 fixed to one end of the pump shaft 2, an electromagnetic clutch 5 provided on the other end side of the pump shaft 2 with a clutch portion 5 a for switching power transmission from the drive pulley 1 to the pump shaft 2, and the impeller 4 Leaked from the impeller 4 side to the clutch part 5a side through the mechanical seal 6 and the mechanical seal 6 mounted between the pump shaft 2 and the pump housing 3 at a position between the clutch part 5a and the clutch part 5a. It has a liquid storage space 7 that can store liquid.

In the pump housing 3, a fixed flange portion 8 fixed to the engine E and a cylindrical tube shaft portion 9 through which the pump shaft 2 is inserted are integrally formed of a metal material such as an aluminum alloy.
The fixed flange portion 8 is formed with a circular shaft insertion hole 8a centering on the rotation axis X, and the cylindrical shaft portion 9 is concentric with the rotation axis X so as to communicate with the shaft insertion hole 8a. Is formed.

The cylindrical shaft portion 9 is integrally provided with a large-diameter cylindrical shaft portion 9a connected to the fixed flange portion 8 and a small-diameter cylindrical shaft portion 9b connected to the large-diameter cylindrical shaft portion 9a.
The inner diameter of the large-diameter cylindrical shaft portion 9a is the same as that of the shaft insertion hole 8a, and the inner diameter of the small-diameter cylindrical shaft portion 9b is smaller than that of the shaft insertion hole 8a.

The pump shaft 2 is inserted through the shaft insertion hole 8a and the inside of the cylindrical shaft portion 9, and is supported on the inner peripheral side of the small diameter cylindrical shaft portion 9b via the pump bearing 10 so as to be rotatable around the rotation axis X. Has been.
The mechanical seal 6 is mounted across the outer periphery of the pump shaft 2 and the inner periphery of the shaft insertion hole 8a.

  The driving pulley 1 is rotatably supported around the rotation axis X on the outer peripheral side of the small-diameter cylindrical shaft portion 9b via the pulley bearing 11. Therefore, the pump shaft 2 and the drive pulley 10 are supported so as to be relatively rotatable around the rotation axis X.

The drive pulley 1 is made of a magnetic material such as an iron material or a nickel alloy material, and has a cylindrical outer peripheral wall 1a centered on the rotational axis X, and the rotational axis X centered on the inner side of the outer peripheral wall 1a. A cylindrical inner peripheral wall 1b and a side end wall 1c that connects ends of the outer peripheral wall 1a and the inner peripheral wall 1b opposite to the impeller 4 are integrally provided.
The side end wall 1c is provided in a posture orthogonal to the rotation axis X.

  The drive pulley 1 is formed with an annular space 12 which is surrounded by the outer peripheral wall 1a, the inner peripheral wall 1b and the side end wall 1c and is opened toward the impeller 4 side. An electromagnetic solenoid 13 is inserted.

A belt winding portion 14a around which the drive belt 14 is wound is formed on the outer peripheral surface of the outer peripheral wall 1a. Further, the pulley bearing 11 is arranged in a state where the outer race is brought into contact with the inner peripheral surface of the inner peripheral wall 1b.
An outer surface side of the side end wall 1c opposite to the electromagnetic solenoid 13 side forms a clutch surface 16 that attracts the armature (clutch plate) 15.
A plurality of circumferentially long through holes 16a penetrating the clutch surface 16 are formed in the side end wall 1c at intervals in the circumferential direction.

The drive belt 14 is wound around an output pulley provided on the crankshaft of the engine E and the drive pulley 1, and continuously drives and rotates the drive pulley 1 when the engine E is in operation.
The on / off operation of power transmission by the electromagnetic clutch 5 is controlled based on the detection result of a temperature sensor (not shown) for detecting the coolant temperature, for example.

  For example, when the cooling water temperature is low (immediately after the engine E is started) (warming up of the engine E is not sufficient), the “clutch disengagement” state (disengaged state) is maintained to promote warming up, and the cooling water temperature is increased. When the set value is exceeded, the state is switched to the “clutch engaged” state (transmission state), and the cooling water is circulated by the drive rotation of the impeller 4.

The electromagnetic clutch 5 includes an electromagnetic solenoid 13 accommodated in the annular space 12 of the drive pulley 1 and a clutch unit 17 that rotates integrally with the pump shaft 2.
The drive pulley 1 forms a magnetic circuit that causes the magnetic flux from the electromagnetic solenoid 13 to act on the armature 15.

  The electromagnetic solenoid 13 includes a solenoid portion 18 that generates a magnetic flux when energized, and a yoke 19 formed of a magnetic material such as an iron material or a nickel alloy material so as to transmit the magnetic flux from the solenoid portion 18 to the drive pulley 1. Yes.

The yoke 19 connects the cylindrical inner tube portion 19a and the outer tube portion 19b arranged concentrically with the rotation axis X, and the end portions on the impeller 4 side of the inner tube portion 19a and the outer tube portion 19b. The cross-sectional shape integrally provided with the annular connecting plate portion 19c is formed in a U-shaped annular shape.
The inner cylinder part 19a is arranged close to the inner peripheral wall 1b, the outer cylinder part 19b is arranged close to the outer peripheral wall 1a, and the connecting plate part 19c is arranged in a posture orthogonal to the rotation axis X.

The solenoid unit 18 has an electromagnetic coil 18 b wound around a bobbin 18 a and the bobbin 18 a is fitted inside the yoke 19.
Therefore, the electromagnetic clutch 5 includes a yoke 19 that holds the electromagnetic coil 18b inside.

  The clutch unit 17 includes a bush 20 that is externally fitted to the end of the pump shaft 2, and a plurality of springs that support the annular armature 15 on the bush 20 and that are biased away from the side end wall 1 c of the drive pulley 1. And a plate 21.

The armature 15 is made of a magnetic material such as an iron material or a nickel alloy material.
The spring plate 21 is made of an elastically deformable plate material such as spring steel, and has one end connected to the flange portion of the bush 20 and the other end connected to the armature 15.

  When the electromagnetic solenoid 13 is not energized, the armature 15 is separated from the clutch surface 16 of the side end wall 1c by the biasing force of the spring plate 21, and the electromagnetic clutch 5 is switched to the "clutch disengaged" state.

When the electromagnetic solenoid 13 is energized, a part of the magnetic flux formed in the magnetic circuit composed of the yoke 19 and the drive pulley 1 leaks outward through the through hole 16a of the side end wall 1c and acts on the armature 15; The armature 15 is attracted to the clutch surface 16 and the electromagnetic clutch 5 is switched to the “clutch engaged” state.
Therefore, the clutch unit 17 constitutes a clutch portion 5 a that turns on and off the power transmission from the drive pulley 1 to the pump shaft 2.

  On the side of the yoke 19 of the fixed flange portion 8 constituting the pump housing 3, a cylindrical wall portion 22 concentric with the rotation axis X is integrally provided, and the yoke 19 is fixed to the cylindrical wall portion 22.

The liquid storage space 7 is formed in an annular shape between the cylindrical wall portion 22 and the large diameter cylindrical shaft portion 9a, and between the end portion of the cylindrical wall portion 22 and the end portion of the large diameter cylindrical shaft portion 9a, An opening 23 is formed to open the liquid storage space 7 toward the yoke 19.
The yoke 19 is disposed such that the connecting plate portion 19 c is in direct contact with the cylindrical wall portion 22, and the connecting plate portion 19 c closes the outer peripheral side portion of the opening 23 of the liquid reservoir space 7.

The large-diameter cylindrical shaft portion 9a is formed with an inflow hole 24 penetrating in the cylindrical radial direction for allowing cooling water or the like leaking from the mechanical seal 6 to the pump bearing 10 side to flow into the liquid storage space 7 by its own weight.
As shown in FIG. 2, a discharge hole 26 through which the cooling water vaporized in the liquid storage space 7 can be discharged to the outside is formed in the upper part and the side part of the cylindrical wall part 22.
The discharge hole 26 may be single or plural, and the water vapor of the cooling water (liquid component) W collected in the liquid storage space 7 can be discharged above the pump housing 3.

  Therefore, the heat held by the yoke 19 heated by the heat generated by energization of the electromagnetic coil 18 b is efficiently conducted to the liquid reservoir space 7 through the connecting plate portion 19 c and the cylindrical wall portion 22, and is transferred to the liquid reservoir space 7. The evaporation of the accumulated cooling water can be promoted.

A resin-made or metal-made plate-like cap 25 that closes the entire circumference and the entire surface of the opening 23 of the liquid storage space 7 is mounted so as to be in contact with the plate surface of the connecting plate portion 19c.
Note that a cap 25 that closes only the gap between the yoke 19 and the cylindrical shaft portion 9 may be provided, or the yoke 19 may be exposed to the liquid storage space 7 without the cap 25 being attached.

[Second Embodiment]
FIG. 3 shows another embodiment of the water pump according to the present invention.
In the present embodiment, the lower portion of the liquid storage space 7 is partitioned by a bottom surface 27 that becomes lower toward the yoke 19 side.
That is, a portion on the lower end side in the vertical direction of the inner peripheral surface of the cylindrical wall portion 22 is formed on the inclined bottom surface 27 that becomes lower toward the yoke 19 side.

By providing such an inclined bottom surface 27, the cooling water flowing into the liquid storage space 7 can flow toward the yoke 19 so as to approach the yoke 19 by its own weight, thereby promoting evaporation.
Other configurations are the same as those of the first embodiment.

[Third Embodiment]
Although not shown in the drawings, the surface of the yoke 19 exposed to the liquid storage space 7 is exposed to, for example, an uneven surface or a rough surface, or by protruding and fixing a metal fin or the like, for example. A part may be provided.
By providing such an uneven portion, the heat radiation area from the yoke 19 to the liquid storage space 7 can be further increased, and the cooling water evaporation effect can be further enhanced.

[Other Embodiments]
1. In the water pump according to the present invention, the yoke and the housing may be integrally formed of a magnetic material.
2. The water pump according to the present invention can be used for various water pumps equipped with an electromagnetic clutch.

DESCRIPTION OF SYMBOLS 1 Drive rotary body 2 Pump shaft 3 Housing 4 Impeller 5 Electromagnetic clutch 5a Clutch part 6 Mechanical seal 7 Liquid storage space 18b Electromagnetic coil 19 Yoke 23 Opening part 27 Bottom face E Drive mechanism

Claims (4)

A drive rotator driven and rotated by a drive mechanism;
A pump shaft that rotates by power transmission from the drive rotor;
A housing through which the pump shaft is inserted;
An impeller fixed to one end of the pump shaft;
An electromagnetic clutch provided on the other end side of the pump shaft with a clutch portion for turning on and off the power transmission from the drive rotor to the pump shaft;
A mechanical seal mounted across the pump shaft and the housing at a position between the impeller and the clutch portion;
A liquid storage space capable of storing liquid leaked from the impeller side to the clutch part side through the mechanical seal;
The electromagnetic clutch includes a yoke for holding an electromagnetic coil;
The liquid storage space is formed in the housing;
A water pump in which the yoke is in contact with the housing. An opening that opens the liquid storage space toward the yoke is formed in the housing.
The water pump according to claim 1, wherein the yoke is disposed so as to close the opening.   The water pump according to claim 2, wherein an uneven portion is provided on a surface of the yoke facing the liquid storage space.   The water pump according to any one of claims 1 to 3, wherein a lower portion of the liquid storage space is defined by a bottom surface that becomes lower toward the yoke.

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