JP2009138543A - Water pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a variable flow rate water pump capable of preventing enlargement to a rotating shaft direction, and excellent in mountability. <P>SOLUTION: The water pump 10 includes a driving-side rotor 20 to which driving force from a driving source is transmitted and rotated, and a driven-side rotor 30 having a pump impeller 31 and rotatably supported by a rotation spindle 33, and a magnet 24 disposed on the driving-side rotor 20 and a guide ring 32 disposed on the driven-side rotor 20 are opposingly arranged, and transmission of rotation force from the driving-side rotor 20 to the driven-side rotor 30 is performed in a non-contact state. The magnet 24 is divided into a plurality of magnet pieces 24a, and the magnet piece 24a includes a temperature sensitive member 25a for changing a radial position. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a water pump used for a water-cooled engine or the like. In particular, the present invention relates to an improvement of a variable flow rate water pump.

  As a water pump used for a water-cooled engine or the like, a variable flow rate type (also called variable capacity type) is known. In this type of water pump, a drive-side rotator including a water pump gear and a water pump pulley that receive the drive force of the engine as a drive source, and a driven-side rotator including a pump impeller disposed in the pump vortex chamber; Are arranged so that the rotational force is transmitted from the driving side rotating body to the driven side rotating body in a non-contact state. Specifically, a rotational force is transmitted between a magnet as a magnetic body attached to the driving side rotator and a guide ring as a derivative attached to the driven side rotator to drive the water pump. It is like that. The magnet and the induction ring are arranged to face each other with a predetermined gap, and a separating wall (partition wall) made of stainless steel or the like is interposed between them. The induction ring has a configuration in which, for example, an aluminum ring member is attached to the outer periphery of the iron core.

In the non-contact type water pump as described above, the flow rate (pump discharge amount) of the water pump is changed by changing the rotational force transmitted from the driving side rotating body to the driven side rotating body. It has become. For example, Patent Document 1 discloses a water whose flow rate is variable by adjusting the rotational force transmitted from the driving side rotating body to the driven side rotating body by sliding the magnet along the axial direction (rotating axis direction). A pump is shown.
Japanese Patent Laid-Open No. 11-6433

  However, in the water pump described in Patent Document 1, in order to change the pump discharge amount, it is necessary to slide the magnet along the rotation axis direction, so it is necessary to ensure the space in the rotation axis direction for that purpose. is there. Therefore, there is a concern that the water pump expands in the direction of the rotation axis, and the mountability of a place where the water pump is installed (for example, the engine front side) is deteriorated.

  When the water pump is a gear drive type, the water pump gear is arranged in the timing chain case, so a space in the direction of the rotation axis must be ensured, and the space necessary for the magnet slide is secured. There is a problem that it is extremely difficult to ensure enough. Therefore, in reality, it is extremely difficult to provide a gear-driven water pump with a configuration necessary for variable capacity, that is, a configuration in which a magnet is slid along the rotation axis direction. Yes.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a variable flow rate water pump that can prevent expansion in the direction of the rotation axis and has excellent mountability.

  In the present invention, means for solving the above-described problems are configured as follows. That is, the present invention is a water pump, which is a drive-side rotator that rotates when a driving force from a drive source is transmitted, and a driven-side rotator that has a pump impeller and is rotatably supported by a rotation support shaft. And a magnetic body provided on one of the driving side rotating body and the driven side rotating body and a derivative provided on the other side are arranged to face each other, and the driven side rotating body is moved to the driven side. It is comprised so that transmission of the rotational force to a rotary body may be performed in a non-contact state. And it is set as the structure which divided | segmented the said magnetic body or derivative into plurality, and changes the radial position of each said magnetic body and derivative | guide_body by changing the radial position of each of the said magnetic body or derivative | guide_body divided | segmented into plurality. A position changing means is provided. Here, it is preferable that the divided structure of the magnetic substance or the derivative is divided into a cross-sectional arc shape having a central angle of 180 degrees or less.

  According to the above configuration, in order to change the pump discharge amount of the water pump, the magnetic body or the derivative is moved by the position changing means in the radial direction with a margin for mounting, so the magnetic body or the derivative is moved along the rotation axis direction. Therefore, there is no need to secure a space in the direction of the rotation axis. Therefore, the water pump can be prevented from expanding in the direction of the rotation axis, the mountability of the location where the water pump is installed (for example, the front side of the engine) can be prevented from being deteriorated, and the variable flow rate type with excellent mountability A water pump can be provided.

  In the present invention, it is preferable that the position changing means is configured as a temperature-sensitive member that can be deformed according to an ambient temperature, and the temperature-sensitive member is provided in each of the plurality of divided magnetic bodies or derivatives. . As such a temperature sensitive member, it is possible to use a bimetal etc., for example. With this configuration, the configuration of the position changing means can be simplified as compared with the case where a negative pressure actuator or an electric actuator is used, which can contribute to the improvement of the water pump mounting property.

  The present invention can be applied to a gear-driven water pump. In a gear-driven water pump, a water pump gear that receives a driving force from a driving source is provided on a driving-side rotating body, and the water pump gear is disposed in a timing chain case. According to the above configuration, it is easy to provide such a gear-driven water pump with a configuration necessary for variable capacity, that is, a configuration for moving the magnetic body or the derivative in the radial direction. Therefore, it is possible to provide a variable flow rate water pump excellent in mountability.

  According to the present invention, in order to change the pump discharge amount of the water pump, it is not necessary to slide the magnetic body or the derivative along the rotation axis direction, so that it is not necessary to secure a space in the rotation axis direction. Therefore, it is possible to prevent the water pump from expanding in the rotation axis direction, to prevent the mountability of the place where the water pump is installed from being deteriorated, and to provide a variable flow rate water pump excellent in mountability. it can.

  The best mode for carrying out the present invention will be described with reference to the accompanying drawings. In this embodiment, an example in which the present invention is applied to a water pump for a vehicle that is mounted on an automobile engine and operates by receiving a driving force from the engine will be described.

-Overall configuration of water pump-
First, the overall configuration of the water pump will be described with reference to FIG. FIG. 1 is a cross-sectional view of a water pump according to an embodiment.

  As shown in FIG. 1, the water pump 10 is disposed in the timing chain case 12 by a water pump housing 11 constituting a pump housing being integrally attached to the cylinder block 1 of the engine by bolts 13. ing. The timing chain case 12 is attached to the front side of the engine (a surface on the front side of the vehicle in the case of a vertically mounted engine and a surface on the side of the vehicle in the case of a horizontally mounted engine).

  The water pump 10 partitions the drive side rotary body 20 provided with the water pump gear 21, the driven side rotary body 30 provided with the pump impeller 31, and the drive side rotary body 20 and the driven side rotary body 30. And a partition wall 40. And the transmission of the rotational force from the drive side rotary body 20 to the driven side rotary body 30 is performed in a non-contact state as will be described later.

  The drive-side rotator 20 includes a water pump gear 21, a drive shaft 22, a magnet support member 23, a magnet 24 as a magnetic body, and a slide mechanism unit 25, which rotate integrally around a horizontal axis. It is configured as follows. The drive-side rotator 20 has a substantially rotationally symmetric shape around its horizontal axis.

  The water pump gear 21 is integrally attached to a drive shaft 22 that extends in the horizontal direction. The water pump gear 21 meshes with the idle gear 4, and the idle gear 4 meshes with the crank gear 3 that is integrally attached to the crankshaft 2 of the engine. Therefore, when the engine is driven, the rotational driving force of the crankshaft 2 of the engine is transmitted to the water pump gear 21 via the crank gear 3 and the idle gear 4, and the water pump gear 21 moves along the axis of the drive shaft 22. It is designed to rotate as the center of rotation.

  The crank gear 3, the idle gear 4, and the water pump gear 21 are disposed in the timing chain case 12. A crank pulley 5 for driving each accessory is attached to the front end portion (left end portion in FIG. 1) of the crankshaft 2, and this crank pulley 5 is arranged outside the timing chain case 12. It is installed.

  The drive shaft 22 is rotatably supported by the water pump housing 11 via a ball bearing 26. A magnet support member 23 is integrally provided at the rear end portion (right end portion in FIG. 1) of the drive shaft 22. The magnet support member 23 is formed in a bottomed cylindrical shape with one side (the side on which the cylinder block 1 is disposed) opened, and a disc portion 23 a extending from the rear end portion of the drive shaft 22 to the outer peripheral side. And a cylindrical portion 23b continuous from the outer peripheral edge of the disc portion 23a to the one side. A plurality of divided magnets (permanent magnets) 24 are provided on the inner peripheral side of the cylindrical portion 23 b of the magnet support member 23. In this embodiment, the magnet 24 includes two semi-cylindrical magnet pieces 24a and 24a, and a slide mechanism 25 is provided in each of the magnet pieces 24a and 24a (see FIG. 3). Details of the magnet 24 and the slide mechanism 25 will be described later.

  The driven-side rotator 30 is disposed in a non-contact state with respect to the drive-side rotator 20 described above, and is configured to rotate by receiving the rotational force from the drive-side rotator 20. The driven-side rotator 30 includes a pump impeller 31 and a guide ring 32 as a derivative, and these are configured to rotate integrally around a horizontal axis. The driven-side rotator 30 has a shape that is substantially rotationally symmetric about its horizontal axis.

  The pump impeller 31 is disposed in a pump vortex chamber 1 b formed by a recessed portion 1 a provided on the surface of the cylinder block 1. The pump impeller 31 is supported by a rotary support shaft 33 extending in the axial direction via a submerged bearing 34 so that the pump impeller 31 can rotate and cannot slide in the axial direction. The rotation support shaft 33 is integrally attached to the cylinder block 1. Then, the cooling water in the pump vortex chamber 1b is sent out to the cooling water passage of the engine by the rotation of the pump impeller 31, whereby the circulating operation of the cooling water is performed.

  The guide ring 32 is attached to the boss portion 31 a of the pump impeller 31 so as to rotate integrally. The induction ring 32 has a configuration in which an aluminum ring member 32b is attached to the outer periphery of the iron core 32a. The ring member 32b of the guide ring 32 and the magnet 24 of the driving side rotating body 20 are arranged at a predetermined interval inside and outside in the radial direction. Further, the ring member 32b and the magnet 24 are arranged so that the positions in the axial direction overlap (overlap) each other. Here, the entire ring member 32 b is disposed so as to face the magnet 24.

  The space in which the driving side rotating body 20 is disposed and the space in which the driven side rotating body 30 is disposed are partitioned by a partition wall 40 made of stainless steel (for example, SUS304). The partition wall 40 has a shape corresponding to the shape of the portion between the driving side rotating body 20 and the driven side rotating body 30, and specifically, an outer peripheral side annular portion 41 positioned on the outer peripheral side, A cylindrical portion 42 continuous to the inner peripheral side of the outer peripheral side annular portion 41 and an inner peripheral disc portion 43 extending from one end of the cylindrical portion 42 to the inner peripheral side are provided.

  The outer peripheral edge of the outer peripheral ring portion 41 is sandwiched between the water pump housing 11 and the timing chain case 12. An O-ring 15 is interposed between the outer peripheral edge of the outer peripheral ring portion 41 and the water pump housing 11.

  The cylindrical portion 42 is disposed between the magnet 24 of the driving side rotating body 20 and the guide ring 32 of the driven side rotating body 30, and is disposed with a gap between them. Yes. As a result, the magnet 24 and the guide ring 32 are arranged to face each other with the cylindrical portion 42 interposed therebetween.

  Further, the inner peripheral disc portion 43 is disposed between the drive shaft 22 of the drive side rotating body 20 and the rotation support shaft 33 that supports the driven side rotating body 30. As described above, the space in which the drive side rotator 20 is disposed and the space in which the follower side rotator 30 is disposed are separated by the partition wall 40, and accordingly, the drive side rotator 20 is driven from the driven side. Transmission of the rotational force to the rotating body 30 is performed in a non-contact state.

  Here, transmission of the rotational force from the driving side rotating body 20 to the driven side rotating body 30 will be described. When the water pump gear 21 is rotated during driving of the engine, the rotational force is transmitted to the magnet support member 23, whereby the drive-side rotator 20 rotates integrally. When the magnet 24 (magnet pieces 24 a, 24 a) rotates with the rotation of the driving side rotating body 20, the magnetic field around the induction ring 32 of the driven side rotating body 30 changes, and the ring member 32 b of the induction ring 32 has An induced current is generated in a direction that prevents the change in the magnetic field. Torque is generated along with the generation of the induced current, whereby the driven-side rotator 30 rotates as a unit. As a result, the pump impeller 31 rotates and the water pump 10 is driven.

-Characteristic part of embodiment-
The characteristic part of this embodiment is that the distance between the magnet 24 and the guide ring 32 in the radial direction is changed by moving the magnet 24 divided into a plurality in the radial direction in the water pump 10 as described above. The point is to change the flow rate (pump discharge amount) of the water pump 10 by changing the magnitude of the rotational force transmitted from the driving side rotating body 20 to the driven side rotating body 30. Specifically, the magnet 24 is divided into a plurality of divided pieces (magnet pieces 24a), and is provided with position changing means for changing the radial position of each divided piece. Hereinafter, this characteristic configuration will be described in detail.

  First, the structure which moves the magnet 24 to radial direction (radial direction) in the water pump 10 is demonstrated.

  In this embodiment, the magnet 24 divided into two is arranged on the radially outer side of the guide ring 32. Specifically, as shown in FIG. 3, the magnet 24 is configured by magnet pieces 24 a and 24 a having a cross-sectional arc shape with a central angle of 180 degrees. In other words, the magnet 24 has a configuration in which a ring-shaped magnet is vertically divided into two (in the circumferential direction).

  Each magnet piece 24a is provided with a slide mechanism 25, respectively. The slide mechanism unit 25 is configured to slide the magnet piece 24a in the radial direction. The temperature sensing member 25a is capable of expanding and contracting along the radial direction according to the ambient temperature (cooling water temperature), and the temperature sensing member 25a. And a guide member 25b for guiding the movement of the magnet piece 24a accompanying the expansion and contraction operation.

  The temperature sensing member 25a is provided as a position changing means for changing the position of the magnet piece 24a in the radial direction, and between the outer peripheral surface of the magnet piece 24a and the inner peripheral surface of the cylindrical portion 23b of the magnet support member 23. It is arranged. One end side of the temperature sensing member 25a is connected to the cylindrical portion 23b, and the other end side of the temperature sensing member 25a is connected to one place in the circumferential direction of the magnet piece 24a. In this case, the other end side of the temperature sensitive member 25a is connected to the central portion in the circumferential direction of the magnet piece 24a.

  The temperature-sensitive member 25a may have any configuration as long as a necessary amount of deformation can be secured within a range in which the ambient temperature (cooling water temperature) changes. The temperature-sensitive member 25a contracts when the ambient temperature is low (when the cooling water temperature is low) and conversely expands (expands) when the ambient temperature is high (when the cooling water temperature is high). For example, bimetal, thermostat, wax, or the like can be used. A metal having a high coefficient of thermal expansion can also be used as the temperature sensitive member 25a.

  The guide members 25b are provided on both sides of the temperature sensitive member 25a and the magnet piece 24a in the axial direction, and are provided to guide the movement of the magnet piece 24a in the radial direction as will be described later. The guide member 25 b is fixed to the inner peripheral surface of the cylindrical portion 23 b of the magnet support member 23.

  Next, the operation of the water pump 10 by the movement of the magnet 24 in the radial direction will be described.

  The magnet piece 24a moves along the radial direction by the expansion / contraction operation of the temperature-sensitive member 25a of the slide mechanism unit 25 as described above, and the radial position of the magnet piece 24a is changed. Accordingly, the radial distance L1 between the magnet piece 24a and the ring member 32b of the guide ring 32 of the driven side rotating body 30 is changed.

  Specifically, when the temperature sensitive member 25a contracts, the magnet piece 24a moves radially outward along the guide member 25b, as shown in FIG. That is, the radial position of the magnet piece 24a is changed radially outward. As a result, as shown in FIG. 2, the radial distance L1 between the magnet piece 24a and the ring member 32b of the guide ring 32 is increased. Here, the distance L1 is a distance from the outer peripheral surface of the ring member 32b of the guide ring 32 in the central portion in the circumferential direction of the inner peripheral surface of the magnet piece 24a. In FIG. 3, the outer peripheral edge of the ring member 32b of the guide ring 32 is indicated by an imaginary line.

  And when the said distance L1 becomes large, the rotational force transmitted to the driven side rotary body 30 from the drive side rotary body 20 will become small. Specifically, when the distance L1 increases, the magnetic field generated around the induction ring 32 of the driven side rotating body 30 due to the rotation of the magnet pieces 24a and 24a of the driving side rotating body 20 decreases. The induced current generated in the ring member 32b is reduced. As a result, the rotational force transmitted from the drive-side rotator 20 to the driven-side rotator 30 is reduced, and the pump discharge amount of the water pump 10 is reduced.

  In this case, the greater the amount of contraction of the temperature sensitive member 25a of the slide mechanism 25, the greater the amount of displacement of the magnet piece 24a outward in the radial direction, and the greater the distance L1. Accordingly, the rotational force transmitted from the driving side rotating body 20 to the driven side rotating body 30 is reduced, and the pump discharge amount of the water pump 10 is reduced. As a result, for example, when the engine is cold, such as when the engine is started, the cooling water temperature is low, so the distance L1 is increased. As a result, the pump discharge amount of the water pump 10 is reduced and the engine is warmed up early. It becomes possible to plan.

  On the other hand, when the temperature sensitive member 25a is extended, the magnet piece 24a moves radially inward along the guide member 25b as shown in FIG. That is, the radial position of the magnet piece 24a is changed radially inward. Thereby, as shown in FIG. 1, the radial distance L1 between the magnet piece 24a and the ring member 32b of the guide ring 32 is reduced.

  When the distance L1 is reduced, the rotational force transmitted from the driving side rotating body 20 to the driven side rotating body 30 is increased. Specifically, when the distance L1 is decreased, the magnetic field generated around the induction ring 32 of the driven side rotating body 30 due to the rotation of the magnet pieces 24a and 24a of the driving side rotating body 20 is increased. The induced current generated in the ring member 32b increases. As a result, the rotational force transmitted from the drive-side rotator 20 to the driven-side rotator 30 increases, and the pump discharge amount of the water pump 10 increases.

  In this case, as the extension amount of the temperature sensing member 25a of the slide mechanism unit 25 increases, the amount of displacement of the magnet piece 24a inward in the radial direction increases, and the distance L1 decreases. As a result, the rotational force transmitted from the driving side rotating body 20 to the driven side rotating body 30 increases, and the pump discharge amount of the water pump 10 increases. As a result, for example, when the engine is warm, such as after warming up, the cooling water temperature is high, so the distance L1 is reduced, and as a result, the pump discharge amount of the water pump 10 is increased to improve the cooling efficiency. It becomes possible. In this case, both ends of the magnet pieces 24a and 24a are in contact with each other, so that further movement of the magnet pieces 24a and 24a inward in the radial direction is restricted.

  As described above, in this embodiment, the pump discharge amount of the water pump 10 can be changed by changing the radial position of the magnet 24 by the slide mechanism unit 25. Therefore, the following effects can be obtained.

  In order to change the pump discharge amount of the water pump 10, the magnet 24 is moved in the radial direction with sufficient room for mounting, so it is not necessary to slide the magnet 24 along the axial direction, and the space for the axial direction for that is eliminated. There is no need to secure it. Therefore, it is possible to prevent the water pump 10 from expanding in the direction of the rotation axis, and it is possible to prevent the mountability of the place where the water pump 10 is installed (here, the engine front side) is deteriorated.

  Moreover, it is easy to provide the gear-driven water pump 10 with a configuration necessary for variable capacity, that is, a configuration for moving the magnet 24 in the radial direction, and has excellent mountability. A variable flow type water pump 10 can be provided. Further, since the temperature sensing member 25a is used as the position changing means for changing the position of the magnet piece 24a in the radial direction, the configuration can be made simpler than when a negative pressure actuator or an electric actuator is used. . For example, a negative pressure chamber required for a negative pressure actuator, piping from a negative pressure generation source, a switching valve, and the like are no longer necessary, which can contribute to a reduction in the number of parts and an improvement in mountability.

-Other embodiments-
As mentioned above, although embodiment of this invention was described, embodiment shown here can be variously deformed.

  The magnet split configuration may be a configuration other than two splits, that is, a configuration of three or more splits. Further, the cross-sectional shape of the magnet piece may be other than the arc shape, and the center angle thereof can be set as appropriate. For example, a divided configuration in which a magnet having a regular polygonal cross section is equally divided into a plurality of pieces may be adopted. In addition, since the temperature sensitive member as a position change means is needed with respect to each magnet piece, it is preferable that the number of magnet pieces is as small as possible. On the other hand, in the two-part configuration, the amount of displacement in the radial direction at both ends is smaller than in the central portion in the circumferential direction of the magnet piece, so that the rotational force transmitted from the driving side rotating body to the driven side rotating body is changed. However, it is possible to avoid the problem by making the magnet split configuration into three or more split configurations. For example, as shown in FIGS. 4 (a) and 4 (b), if the magnet 24 'has a configuration in which a ring-shaped magnet is equally divided into three in the circumferential direction, the central portion in the circumferential direction of the magnet piece 24a' The amount of displacement in the radial direction with respect to both ends can be made uniform, and it is possible to efficiently change the rotational force transmitted from the driving side rotating body to the driven side rotating body. 4A shows a state at a high water temperature, and FIG. 4B shows a state at a low water temperature.

  It is good also as a structure using other than the temperature sensitive member 25a as a position change means to change the position of the radial direction of a magnet. For example, an electric actuator or a negative pressure actuator may be used as the position changing means. In the case of using a negative pressure actuator, it is possible to form a substantially sealed negative pressure chamber in the water pump and to connect the negative pressure chamber and the negative pressure generating source through a negative pressure pipe. As the negative pressure generation source, for example, the intake negative pressure (intake pipe negative pressure) of the engine can be used. In this case, the intake negative pressure is introduced into the negative pressure chamber from the intake manifold of the engine. Is possible.

  In the configuration using the temperature sensing member 25a described above, instead of realizing a simple configuration, the control of the pump discharge amount depends only on the cooling water temperature, so fine control is difficult. On the other hand, in the configuration using the electric actuator and the negative pressure actuator, it is possible to control the pump discharge amount based on other factors in addition to the cooling water temperature, and fine control can be realized. As other factors, for example, the load factor of the engine can be used. In this case, even when the cooling water temperature is low and the load factor is high, it is transmitted from the driving side rotating body to the driven side rotating body. It becomes possible to secure a necessary pump discharge amount by increasing the rotational force. Thereby, it is possible to prevent overheating in a situation where there is a strong acceleration request when cold.

  As long as the transmission of the rotational force from the driving side rotating body 20 to the driven side rotating body 30 is possible in a non-contact state, the constituent members of the driving side rotating body 20, the driven side rotating body 30, the partition 40, The shape, the arrangement position, and the like are not limited to those described above, and can be variously changed. For example, in the above-described embodiment, the drive-side rotator 20 is provided with the magnet 24 and the driven-side rotator 30 is provided with the guide ring 32. However, the drive-side rotator is provided with a guide ring, and the driven-side rotator is provided with a magnet. It is good also as a structure which provides.

  Although the case where the magnet is divided into a plurality of parts has been described above, the pump discharge amount of the water pump can be changed by dividing the guide ring into a plurality of parts and moving each of the divided guide rings in the radial direction. Good.

  In the above embodiment, the case where the pump vortex chamber 1b is formed by the recessed portion 1a provided on the surface of the cylinder block 1 of the engine has been described. However, the pump vortex chamber is formed using the timing chain case. The present invention is also applicable.

  In the above embodiment, the case where the present invention is applied to a gear-driven water pump has been described. However, the present invention is also applicable to a belt-driven water pump. In the case of a belt-driven water pump, the rotational driving force of the crankshaft of the engine can be transmitted to the water pump pulley via an accessory belt. In this case, the water pump pulley can be provided outside the timing chain case.

  In the above-described embodiment, the case where the present invention is applied to a vehicle water pump that is mounted on an automobile engine and operates by receiving a driving force from the engine has been described. The present invention is not limited to this, and can also be applied to water pumps used for purposes other than those for automobiles. Further, the drive source of the water pump is not limited to the engine (internal combustion engine), but may be one that receives a driving force from an electric motor (electric motor).

It is sectional drawing which shows the water pump which concerns on embodiment, Comprising: It is a figure which shows the state at the time of high water temperature. It is sectional drawing which shows the water pump which concerns on embodiment, Comprising: It is a figure which shows the state at the time of low water temperature. It is a perspective view which shows the division | segmentation structure of the magnet in the water pump which concerns on embodiment, Comprising: (a) is a figure which shows the state at the time of high water temperature, (b) is a figure which shows the state at the time of low water temperature. It is a perspective view which shows the modification of the division structure of a magnet, Comprising: (a) is a figure which shows the state at the time of high water temperature, (b) is a figure which shows the state at the time of low water temperature.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cylinder block 1b Pump vortex chamber 10 Water pump 11 Water pump housing 12 Timing chain case 20 Drive side rotary body 21 Water pump gear 24 Magnet (magnetic body)
24a Magnet piece 25 Slide mechanism 25a Temperature sensitive member (position changing means)
30 Driven Rotating Body 31 Pump Impeller 32 Guide Ring (Derivative)
33 Rotating spindle 40 Bulkhead

Claims (4)

A driving-side rotating body that rotates by transmitting a driving force from a driving source; and a driven-side rotating body that has a pump impeller and is rotatably supported by a rotation support shaft. A magnetic body provided on one of the rotating bodies and a derivative provided on the other face each other, and the transmission of rotational force from the driving side rotating body to the driven side rotating body is non-contact. In a water pump configured to be performed in a state,
The magnetic substance or derivative is divided into a plurality of parts,
A water pump comprising position changing means for changing a radial distance between the magnetic body and the derivative by changing a radial position of each of the plurality of divided magnetic bodies or derivatives. . The water pump according to claim 1,
A water pump characterized in that each of the magnetic substance or derivative divided into a plurality of parts has an arc shape in cross section, and each central angle is 180 degrees or less. In the water pump according to claim 1 or 2,
The water is characterized in that the position changing means is configured as a temperature-sensitive member that can be deformed according to an ambient temperature, and the temperature-sensitive member is provided in each of the plurality of divided magnetic bodies or derivatives. pump. In the water pump according to any one of claims 1 to 3,
A water pump characterized in that the drive side rotating body is provided with a water pump gear for receiving a driving force from a driving source, and the water pump gear is arranged in a timing chain case.

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