JP4293418B2 - Magnet type fan clutch device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a low-noise, high-efficiency magnet-type fan clutch device that controls rotation of a cooling fan that is mainly applied to an internal combustion engine for a vehicle.
[0002]
[Prior art]
As a fan clutch for controlling the rotation of a cooling fan applied to an internal combustion engine for a vehicle, there is a magnet type fan clutch device in which a magnet coupling and an electromagnetic clutch are integrated (Japanese Patent Laid-Open No. 2002-195303). This type of magnetic fan clutch device is a combination of a magnetic coupling and an electromagnetic clutch, and a fan is attached to the magnetic coupling side. Specifically, for example, an excitation supported on a drive shaft or a fixed shaft. A rotatable electromagnetic clutch comprising a clutch rotor with a built-in coil and an armature, a permanent magnet rotating body with a fan attached to the outer periphery, and a hysteresis material or conductor arranged so as to face the permanent magnet with a slight gap And a permanent magnet rotating body and a magnet coupling that rotates relative to each other by the attraction acting between the permanent magnet and the hysteresis material or the conductor. This is a mechanism in which the ring is ON / OFF controlled.
In the case of the magnet type fan clutch device having such a configuration, when the excitation coil of the electromagnetic clutch is energized (ON), the armature is attracted and attracted to the clutch rotor, and the clutch rotor and the armature and the disc or the driven housing are integrated. The fan rotates by magnet coupling, and the rotation of the fan can be controlled by turning the electromagnetic clutch ON / OFF. The electromagnetic clutch is used for cooling water temperature, throttle opening, engine Since the ON / OFF control is linked to the rotation speed of the air conditioner switch, etc., the fan rotation can be controlled accurately and stably, and when the fan rotates with the magnet coupling, the magnet coupling is permanent. Due to the magnetic force of the magnet Since the slip torque is transmitted and the cushion starts, the load when the electromagnetic clutch is turned on is small, and the fan noise can be significantly reduced compared to a fan clutch device without a magnet coupling. It produces excellent effects such as
[0003]
[Problems to be solved by the invention]
However, in the conventional magnet type fan clutch device, the magnet coupling is composed of a permanent magnet rotating body and a permanent magnet attached to the rotating body, and the switching control of the direction of the magnetic flux between the permanent magnet and the electromagnetic clutch is possible. Since this is not possible, there has been a drawback that the rotational speed of the fan cannot be changed arbitrarily.
[0004]
The present invention has been made to solve the above-described problems, and provides a magnet type fan clutch device that can arbitrarily change the rotational speed of a fan only by controlling the ON / OFF of an electromagnetic clutch and the direction of an excitation current. It is something to be offered.
[0005]
[Means for Solving the Problems]
A magnet type fan clutch device according to the present invention is a magnet type fan clutch device in which a magnet coupling and an electromagnetic clutch are combined, and a fan is attached to the magnet coupling side, and rotates on a fixed shaft via a bearing device. An electromagnetic clutch composed of a clutch rotor supported in an operative manner and an excitation coil provided in the rotor, a permanent magnet rotating body rotatably supported on the fixed shaft via a bearing device, and the permanent magnet An armature held by a rotating body so as to be movable back and forth, a disk with a fan rotatably supported on the fixed shaft via a bearing device, and a small gap from a permanent magnet mounted on the permanent magnet rotating body. It has a conductor or hysteresis material attached to the disk as opposed to it, and between the permanent magnet and the conductor or hysteresis material. A magnet type comprising a permanent magnet rotating body and a magnet coupling that rotates relative to each other by an attractive action, and the electromagnetic coupling is controlled ON / OFF by the electromagnetic clutch. In the fan clutch device, the permanent magnet rotating body has a two-part structure (double structure) of an inner permanent magnet rotating body and an outer permanent magnet rotating body, and both the rotating bodies are provided to be mutually rotatable via a bearing device, with further provided armature to each other in the inner permanent magnet rotating body and the outer permanent magnet rotator said, embedded permanent magnets on the outside of the armature, oN the electromagnetic clutch, the Rukoto changing the energization direction of the OFF control to the exciting coil The rotation speed of the fan-equipped disc is variable.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a longitudinal side view showing an embodiment of a magnet type fan clutch device according to the present invention, and FIG. 2 is a diagram showing a double-structure permanent magnet rotating body of the same magnet type fan clutch device as seen in the direction of the arrows in FIG. 3 to 5 are cross-sectional views for explaining the operating principle of the magnet type fan clutch device, FIG. 3 is an operating principle when the electromagnetic clutch is OFF, and FIG. 4 is an operating principle when the electromagnetic clutch is ON (+). FIG. 5 is a cross-sectional view showing the operating principle when the electromagnetic clutch is ON (−) (the fan is ON). 6 to 8 exemplify the performance characteristics of the magnet type fan clutch device, FIG. 6 is a diagram showing the relationship between the engine cooling water temperature and the fan rotational speed, and FIG. 7 is the relationship between the engine rotational speed and the fan rotational speed. FIG. 8 shows the relationship between the engine coolant temperature and the fan speed in another embodiment. In the figure, 1 is a fixed shaft, 2 is an electromagnetic clutch, 3 is a magnet coupling, 4 is an armature, 5a to 5d are bearing devices, and 6 is a fan.
[0007]
The magnet type fan clutch device shown in FIGS. 1 to 2 has a configuration in which an electromagnetic clutch 2 and a magnet coupling 3 are provided on a non-rotating fixed shaft 1, and the electromagnetic clutch 2 is mounted on a fixed shaft 1 with a bearing device 5a. A clutch rotor 2-1 with a pulley 2-1a that is rotatably supported via a shaft, and an exciting coil 2-incorporated into the clutch rotor 2-1 and fixed to the fixed shaft 1 via a stay 2-3. 2.
[0008]
On the other hand, the magnet coupling 3 includes a permanent magnet rotor 3-1 having a two-part structure rotatably supported on the fixed shaft 1 via a bearing device 5b, and an inner rotor 3-11 of the permanent magnet rotor. An inner permanent magnet 3-11a, an outer permanent magnet 3-12a attached to the outer rotating body 3-12, a disk 3-2 with a fan 6 rotatably supported on the fixed shaft 1 via a bearing device 5d, A conductor attached to the disk 3-2 so as to face the inner permanent magnet 3-11a and the outer permanent magnet 3-12a mounted on the permanent magnet rotating body 3-1 having the two-divided structure with a slight gap therebetween. (Or a hysteresis material) 3-3, and the permanent magnet rotating body 3-1 and the above-described magnets are attracted by the attraction action accompanying the eddy current acting between the permanent magnets 3-11a and 3-12a and the conductor 3-3. Disc with conductor 3-3 -2 forms a mechanism for relatively rotating.
The permanent magnet rotor 3-1 having a two-part structure in the magnet coupling 3 includes an inner rotor 3-11 and an outer rotor 3-12 that are rotatable with respect to each other via a bearing device 5 c. The inner armature 4-1 and the outer armature 4-2 are held on the back surface (electromagnetic clutch side) by leaf springs 4-1a and 4-2a, respectively, so as to be movable back and forth. Of the armatures 4-1 and 4-2 attached to the back surface of each rotating body, the outer armature 4-2 attached to the outer rotating body 3-12 has a permanent magnet (inner magnet) 4 inside. 2b is incorporated.
[0009]
The permanent magnets 3-11a and 3-12a of the magnet coupling 3 in the magnet type fan clutch device have a multipolar structure as shown in FIG. In other words, the permanent magnets 3-11a and 3-12a having a divided structure are alternately arranged on the circumferences of the inner rotating body 3-11 and the outer rotating body 3-12, respectively, as N poles and S poles. Yes.
[0010]
In the magnet type fan clutch device shown in FIGS. 1 to 2, when the electromagnetic clutch 2 is turned on while the clutch rotor 2-1 is rotating via the pulley 2-1a, the exciting coil fixed to the fixed shaft 1 By 2-2, the inner armature 4-1 and the outer armature 4-2 held by the permanent magnet rotor 3-1 having a two-part structure so as to be movable back and forth are attracted and attracted to the clutch rotor 2-1, and the clutch The rotor 2-1 and the permanent magnet rotating body 3-1 rotate integrally. When this permanent magnet rotating body 3-1 rotates, the inner permanent magnet 3-11a and the outer permanent magnet 3-12a of the permanent magnet rotating body and the conductor 3-3 attached to the disk 3-2. The disk 3-2 rotates and the fan 6 rotates by the suction action accompanying the working eddy current.
[0011]
In the above-described magnet type fan clutch device shown in FIGS. 1 and 2, the operation when the electromagnetic clutch is turned on and off will be described with reference to FIGS.
First, FIG. 3 shows a state where the exciting coil is not energized (electromagnetic clutch OFF) when the engine cooling water temperature is as low as 70 ° C. or less. In this case, the inner armature 4-1 and the outer armature 4-2 are Since it is not attracted to the clutch rotor 2-1, only the clutch rotor 2-1 rotates and the fan 6 is in a non-rotating state.
Next, FIG. 4 shows a state in which the electromagnetic clutch is turned on by energizing (+) the exciting coil when the engine coolant temperature is an intermediate temperature (for example, 70 to 90 ° C.). In this case, the outer armature 4- 2 is canceled out by the reverse magnetic flux of the inner magnet 4-2b, so that only the inner armature 4-1 operates and an eddy current is generated only by the inner permanent magnet 3-11a. .
Further, FIG. 5 shows a state in which the electromagnetic clutch is turned on by energizing (−) the exciting coil when the engine coolant temperature is high (for example, 90 ° C. or higher). In this case, the inner armature 4-1 and The outer armature 4-2 is operated together, and a large torque is transmitted by the strong attractive force accompanying the eddy current generated in both the inner permanent magnet 3-11a and the outer permanent magnet 3-12a, so that the fan 6 is turned on. Become.
[0012]
Thus, in the case of the magnet type fan clutch device of the present invention, as shown in FIGS. 6 to 8, the rotation of the fan can be changed by ON / OFF control of the electromagnetic clutch.
That is, as shown in FIG. 6, the relationship between the engine coolant temperature and the fan rotation speed is such that the fan does not rotate when the engine coolant temperature is as low as 70 ° C. or less and the excitation coil is not energized (electromagnetic clutch OFF). However, when the engine coolant temperature is 70 ° C., the excitation coil is energized (+) and the electromagnetic clutch is turned on, so that only the inner permanent magnet 3-11a is operated and the fan is in the mid rotation, and further the engine coolant temperature When the temperature is 90 ° C. or higher, both the inner permanent magnet and the outer permanent magnet are operated to turn the fan on.
Further, in the relationship between the engine coolant temperature and the fan rotation speed, the fan rotation speed can be changed as shown in FIG.
The above characteristics are the case of the magnet type fan clutch device in which the permanent magnet (inner magnet) 4-2a is incorporated in the outer armature 4-2, but the case where the inner magnet is incorporated in the inner armature 4-1. The mid rotation can be set high as shown in FIG. 8 showing the relationship between the engine coolant temperature and the fan rotation speed.
[0013]
【The invention's effect】
As described above, the magnet type fan clutch device according to the present invention has a permanent magnet rotating body that is divided into an inner side and an outer side, and an armature is provided on each of the inner permanent magnet rotating body and the outer permanent magnet rotating body. Alternatively, by incorporating a permanent magnet into the inner armature, the fan rotation speed can be changed arbitrarily with only one electromagnetic clutch ON / OFF control, reducing fan noise and improving fuel efficiency. In addition to being peeled off, the initial torque applied to the electromagnetic clutch can be suppressed, so that the size and cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a longitudinal side view showing an embodiment of a magnet type fan clutch device according to the present invention.
FIG. 2 is a view as seen from the direction of the arrows in FIG.
FIG. 3 is a cross-sectional view for explaining the operating principle of the magnet type fan clutch device when the electromagnetic clutch is OFF.
FIG. 4 is a cross-sectional view for explaining the operating principle (fan is MiD rotation) when the electromagnetic clutch is ON (+).
FIG. 5 is a cross-sectional view for explaining the operating principle when the electromagnetic clutch is ON (-) (the fan is turned ON).
FIG. 6 is a diagram illustrating the performance characteristics of the magnet type fan clutch device, and showing the relationship between the engine coolant temperature and the fan rotation speed.
FIG. 7 is also a diagram showing the relationship between engine speed and fan speed.
FIG. 8 is a graph showing the relationship between engine coolant temperature and fan rotation speed in another embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Fixed shaft 2 Electromagnetic clutch 3 Magnet coupling 3-11a Inner permanent magnet 3-12a Outer permanent magnet 4 Armature 4-1 Inner armature 4-2 Outer armature 4-1a, 4-2a Leaf spring 4-2b Permanent magnet (inner magnet)
5a to 5d Bearing device 6 Fan

Claims (1)

A magnet type fan clutch device in which a magnet coupling and an electromagnetic clutch are combined and a fan is attached to the magnet coupling side, the clutch rotor rotatably supported on a fixed shaft via a bearing device, and the rotor An electromagnetic clutch comprising an exciting coil provided in the interior, a permanent magnet rotating body rotatably supported on the fixed shaft via a bearing device, and an armature held by the permanent magnet rotating body so as to be movable back and forth A disk with a fan rotatably supported on the fixed shaft via a bearing device, and a conductor attached to the disk so as to face the permanent magnet mounted on the rotating body of the permanent magnet with a slight gap. Or having a hysteresis material, and the permanent magnet rotating body and the disc by an attractive action acting between the permanent magnet and the conductor or the hysteresis material In the magnet type fan clutch device, which is configured by a magnet coupling that is configured to rotate relative to each other, and the magnet coupling is controlled to be turned on and off by the electromagnetic clutch, the permanent magnet rotating body is an inner permanent magnet. The rotating body and the outer permanent magnet rotating body are divided into two parts, both the rotating bodies are provided so as to be mutually rotatable via a bearing device, and an armature is provided for each of the inner permanent magnet rotating body and the outer permanent magnet rotating body. with, embedded permanent magnets on the outside or inside of the armature, and characterized in that said no electromagnetic clutch oN, the Rukoto changing the energization direction of the OFF control to the exciting coil of changing the rotational speed of the fan with disc Magnetic fan clutch device.

Images