JPH1163009A - Clutch cooling structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively discharge friction heat generated in a clutch by providing one end of a heat pipe to be capable of transmitting heat in the vicinity of an engaging part with one of a driving side member and a follower side member and the other end to be capable of transmitting heat with external air. SOLUTION: If a magnetic particle solenoid clutch 11 is placed in a slipping state, friction heat is generated by relative sliding. This heat is transmitted to the heating part 4 of the container 2 of a heat pipe 1 projectingly provided in a clutch casing 12, hydraulic fluids staying in the heating part 4 are heated and evaporated. The evaporated hydraulic fluids are moved toward a low-temperature heat discharge part 5, and the heat is taken away in the inner surface of the heat discharge part 5, and condensed. The heat is discharged by the heat discharge part 5 when the vapors of the hydraulic fluids are condensed, and transmitted to the winding part 7 of a flow- straightening heat discharge fin 6. A part of the friction heat transmitted to the winding part 7 is discharged into external air, and the remaining part is transmitted to the blade part 8 of the flow-straightening heat discharge fin 6, a part is discharged into external air, the remaining part is transmitted to a number of heat discharge fins 9 provided side by side in the blade part 8, and then discharged into external air therefrom.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clutch cooling structure using a heat pipe.

[0002]

2. Description of the Related Art Conventionally, in an air-cooled clutch such as a dry friction clutch or an electromagnetic clutch, friction heat generated from the clutch is released into the outside air by directly bringing a clutch disk or magnetic particles into contact with the outside air. .

FIG. 12 shows an example of a conventional dry friction clutch. When the release fork 42 of the dry friction clutch 41 is not operating, the clutch spring 4
The clutch disc 50 is pressed against the pusher plate 49 pushed to the flywheel 48 side by the elastic force of 7 so as to be sandwiched by the flywheel 48, and the clutch is engaged. As a result, the torque transmitted from the engine (not shown) to flywheel 48 is transmitted to clutch disc 50. Then, the clutch shaft 5 spline-fitted to the clutch disc 50
1 transmits torque to a transmission (not shown).

When the upper part of the release fork 42 in FIG. 12 moves to the right in FIG. 12 from the fulcrum 43, the lower part of the release fork 42 below the fulcrum 43 moves the release bearing 44 to the flywheel side 48. . The movement of the release bearing 44 causes the portion of the release lever 45 below the fulcrum 46 to move toward the flywheel 48. As a result, the upper portion of the release lever 45 moves rightward against the elastic force of the clutch spring 47, and the pusher plate 49 moves rightward accordingly, whereby the pusher plate 49 and the flywheel When the pressing force with 48 decreases, the clutch shifts from the engaged state to the slip state. When the clutch disk 50 separates from the pusher plate 49 and the flywheel 48, the clutch is released. Accordingly, the torque from the engine is transmitted to the clutch at a lower level than in the engaged state, and is shut off when the clutch is released.

FIG. 13 shows an example of a conventional magnetic powder type electromagnetic clutch. The clutch current input to the brush 62 of the magnetic powder type electromagnetic clutch 61 is input to the exciting coil 63, and the exciting coil 63 generates a magnetic field around it. Then, the magnetic particles 64 are changed from powder to chain by the generated magnetic field and solidified. Thereby, the torque transmitted from the engine (not shown) to the clutch casing 65 is transmitted from the driven rotor 66 to the clutch shaft 67 via the magnetic particles 64. Further, when the value of the clutch current input to the exciting coil 63 is increased or decreased,
The intensity of the generated magnetic field is increased and the magnetic particles 64
Changes its solidification state. As a result, the magnetic powder type electromagnetic clutch 61 changes to any of the engaged state, the slip state, and the released state, and the torque transmitted to the clutch shaft 67 is controlled.

In either of the conventional examples, when the clutch disk is in a slip state, frictional heat is generated because the clutch disk, the pusher plate, and the flywheel rotate relatively while sliding.

[0007]

By the way, at present, when the output of the engine is being increased, the amount of frictional heat generated in the clutch tends to increase. Further, when the vehicle starts or shifts, the clutch slips to smoothly transmit the torque, and frictional heat is generated. further,
If the vehicle starts or shifts frequently, a large amount of frictional heat is generated.

As a result, if the amount of generated frictional heat exceeds the heat dissipation capability of the clutch itself, the generated frictional heat may remain in the clutch, causing the clutch to overheat or burn. .

In the clutch that releases frictional heat to the outside air by natural cooling, the clutch must have a cooling capacity capable of coping with an increase in the output of the engine and an increase in the amount of frictional heat generated due to frequent starting and shifting of the vehicle. In order to provide the clutch, it is necessary to increase the volume of the clutch itself. Then, the volume of the transmission itself becomes large, and there is a possibility that downsizing and cost reduction of the transmission may be hindered.

The present invention has been made in view of the above circumstances, and has as its object to provide a clutch cooling structure capable of sufficiently and efficiently releasing frictional heat generated in a clutch by using a heat pipe. And

[0011]

SUMMARY OF THE INVENTION In order to achieve the above object, according to the present invention, a driving member which is driven to rotate and a torque is transmitted by being selectively engaged with the driving member. In a cooling structure for a clutch having a driven member and a driven member, at least one of the driving member and the driven member is provided with one end of a heat pipe in the vicinity of an engagement portion with the other member so as to be able to transfer heat. The other end of the heat pipe is provided so as to be able to transfer heat to the outside air.

Further, at the other end of the heat pipe, vane-shaped fins can be provided which generate cooling air having a velocity component directed in a radial direction of any member when the heat pipe revolves.

Further, the other end of the heat pipe can be formed into a blade shape that generates cooling air having a velocity component directed in a radial direction of any member when the heat pipe revolves.

Therefore, in the present invention, the heating portion of the heat pipe is buried or mounted on the clutch or provided near the clutch so that heat can be transmitted from the clutch. By providing heat transfer with the outside air via the air, frictional heat generated by the clutch can be sufficiently released into the outside air. As a result, the clutch can be sufficiently cooled.

In the present invention, a large number of blade-like fins for generating cooling air flowing in the radial direction of the clutch member by the rotation of the clutch are provided in the heat radiating portion of the heat pipe. The cooling air flowing in the radial direction of the heat pipe generates the cooling air, which transfers the frictional heat of the clutch transmitted to the heat radiating part of the heat pipe, so that the frictional heat generated by the clutch can be efficiently released into the outside air. it can. As a result, the clutch can be efficiently cooled.

On the other hand, in the present invention, the heat radiating portion of the heat pipe is formed in the shape of a blade that generates cooling air flowing in the radial direction of the clutch member by rotation of the clutch, so that the radial direction of the clutch member is increased with the rotation of the clutch. Is generated, and the cooling air transfers the frictional heat of the clutch transmitted to the heat radiating portion of the heat pipe, whereby the frictional heat generated by the clutch can be efficiently released into the outside air. As a result, the clutch can be efficiently cooled.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described based on specific examples. 1 to 4 show one embodiment of the present invention. The heat pipe 1 protruding from the magnetic powder type electromagnetic clutch 11 includes a hollow cylindrical container 2 whose both ends are hermetically closed. A predetermined amount of a condensable fluid such as water or alcohol is sealed as the working fluid 3.

A rectifying radiating fin 6 is integrally joined to one end of the container 2 so that heat can be transmitted. The rectifying radiating fins 6 are made of an aluminum plate, and a winding portion 7 is wound around a circumferential portion at one end by welding or the like.

The blades 8 extending from the winding portions 7 of the rectifying radiating fins 6 generate cooling air flowing in the radial direction of the members of the magnetic powder type electromagnetic clutch 11 when the heat pipe 1 revolves. It is formed in a wing shape.

A large number of radiating fins 9 are provided on both sides of the blade 8 of the rectifying radiating fin 6 by welding or the like.
Are arranged side by side in the longitudinal direction, and the respective radiation fins 9 are configured to be parallel to the axial direction of the container 2.

Note that one end of the container 2 provided with the rectifying radiating fins 6 serves as a heat radiating section 5 and the other end serves as a heating section 4.

On the other hand, a crankshaft 13 for transmitting the torque of an engine (not shown) is provided on the center axis of a thick cylindrical clutch casing 12 which is a housing of the magnetic powder type electromagnetic clutch 11 in which the heat pipe 1 is provided. Fixed. An annular excitation coil 14 for generating a magnetic field is provided inside the clutch casing 12 so as to generate a magnetic field in the direction of the central axis of the clutch casing 12.

A driven rotor 16 is provided on the inner side of the clutch casing 12 with a gap 15 interposed therebetween. This driven rotor 16 has a disk shape,
Its circumference is thicker. The center of the driven rotor 16 is spline-fitted to a clutch shaft 17 provided on the same axis as the crankshaft 13. Note that the crankshaft 13 and the clutch shaft 17 are configured to be relatively rotatable. In addition,
A brush 18 for inputting a current to the exciting coil 14 is provided on a circumferential portion of the clutch shaft 17.

Further, in the gap 15, there are magnetic powder particles 19 which are coupled by a magnetic field generated from the exciting coil 14. The magnetic powder particles 19 are magnetic particles such as iron powder in which the coupling force between the particles changes depending on the strength of the generated magnetic field.

A heat pipe 1 is provided in a portion of the clutch casing 12 between the exciting coil 14 and the driven rotor 16 in the axial direction of the clutch shaft 17.
Are protruding in large numbers. The heating section 4 of the container 2 is buried inside the clutch casing 12. Also,
The blade portion 8 of the rectifying radiating fin 6 is
Are provided so as to be curved in a direction opposite to the rotation direction of the.

Next, the operation of the embodiment having the above configuration will be described. When the vehicle starts or shifts, a clutch current controlled in a control box (not shown) by a vehicle speed, a shift signal, a throttle opening, and the like is input to the exciting coil 14 via the brush 18, and as a result,
A magnetic field is generated by the exciting coil 14, and the magnetic particles 19 are changed from a powdery state to a chain state and solidified, so that the magnetic powder type electromagnetic clutch 11 enters a slip state or an engaged state.

When the magnetic powder type electromagnetic clutch 11 slips, the magnetic particles 19 slide relative to the other magnetic particles 19, the clutch casing 12, and the driven rotor 16, so that frictional heat is generated. Occur. The generated frictional heat is transmitted to the heating section 4 of the container 2 of the heat pipe 1 protruding from the clutch casing 12. Then, the working fluid 3 staying in the heating unit 4 is heated and evaporated.

The working fluid 3, which has been turned into steam, is supplied to the low-temperature radiator 5.
, And is deprived of heat on the inner surface of the heat radiating portion 5 and condensed. That is, the steam of the working fluid 3 transports frictional heat as steam latent heat, and the heat is released when the steam of the working fluid 3 condenses in the heat radiating unit 5. Then, the released heat is transmitted from the heat radiating portion 5 to the winding portion 7 of the rectifying heat radiating fin 6.

A part of the frictional heat transmitted to the winding portion 7 is released into the outside air, and the remaining portion is transmitted to the blade 8 of the rectifying radiating fin 6. A part of the frictional heat transmitted to the blades 8 of the rectifying radiating fins 6 is released to the outside air, and the remaining part is transmitted to a large number of radiating fins 9 arranged in parallel to the blades 8 and released to the outside air therefrom. You.

When the heat pipe 1 revolves with the rotation of the clutch casing 12 of the magnetic powder type electromagnetic clutch 11, the blades 8 of the rectifying radiating fins 6 generate cooling air flowing in the radial direction of the clutch casing 12. Transfer the frictional heat released into the outside air.

On the other hand, the condensed working fluid 3 returns to the heating section 4 by capillary pressure. Then, the working fluid 3 returned to the heating unit 4 is heated again and evaporates, and the same cycle as the above-described cycle is continued.

As described above, the friction heat generated from the magnetic powder type electromagnetic clutch 11 is heat-transported by the heat pipe 1 and released into the outside air, and the magnetic powder type electromagnetic clutch 11 is cooled. Cooling capacity can be improved.

The blades 8 of the rectifying radiating fins 6 are formed in a shape that generates cooling air flowing in the radial direction of the clutch casing 12, so that when the heat pipe 1 revolves with the rotation of the clutch casing 12, cooling is performed. Wind is generated, and frictional heat released from the rectifying radiating fins 6 and the radiating fins 9 is transferred by the cooling wind. As a result, the frictional heat of the magnetic powder type electromagnetic clutch 11 is reduced.
1, the temperature rise near the magnetic powder type electromagnetic clutch 11 is suppressed. In addition, since cooling air is positively introduced into the magnetic powder type electromagnetic clutch 11, heat radiation from the entire magnetic powder type electromagnetic clutch 11 to the outside air is promoted.
Therefore, the magnetic powder type electromagnetic clutch 11 can be sufficiently and efficiently cooled.

FIGS. 5 to 7 show another embodiment of the present invention. The embodiment shown here is different from the above embodiment in the structure of the fin. That is, the heat radiating portion 25 of the container 22 of many heat pipes 21 includes:
A plurality of annular radiating fins 26 formed in an annular shape are juxtaposed in the longitudinal direction of the container 22 by welding or the like. A large number of rectifying radiating fins 27 are provided between the two annular radiating fins 26 so as to generate cooling air flowing in the radial direction of the clutch casing 12 when the heat pipe 21 revolves. ing. Since the magnetic powder type electromagnetic clutch 11 has the same structure as that of the above-described embodiment, the same reference numerals are given to the drawings and the description is omitted.

Therefore, in the structure shown in FIGS. 5 to 7, the frictional heat generated when the magnetic powder type electromagnetic clutch 11 slips is transferred to the heating portion 24 of the container 22 projecting from the clutch casing 12. Is transmitted. Then, the frictional heat is heat-transported to the heat radiating portion 25 by the working fluid 23 sealed in the container 22, part of the frictional heat is released into the outside air, and the remaining portion is a large number of annular heat radiating fins 26.
Is transmitted to Part of the frictional heat transmitted to the annular radiating fins 26 is released into the outside air, and the rest is
Are transmitted to a large number of rectifying radiating fins 27 arranged in parallel to each other, and are discharged therefrom to the outside air.

When the heat pipe 1 revolves with the rotation of the clutch casing 12 of the magnetic powder type electromagnetic clutch 11, the rectifying radiating fins 27 generate cooling air flowing in the radial direction of the clutch casing 12, and the cooling air flows into the outside air. Transfers the released frictional heat.

As described above, also in the other embodiments described above,
The heat transfer of the frictional heat generated from the magnetic powder type electromagnetic clutch 11 by the heat pipe 21 and releasing it to the outside air to cool the magnetic powder type electromagnetic clutch 11 can improve the cooling ability of the magnetic powder type electromagnetic clutch 11. it can. In addition, by forming the rectifying radiating fins 27 into a shape that generates cooling air flowing in the radial direction of the clutch casing 12, when the heat pipe 1 revolves with the rotation of the clutch casing 12, cooling air is generated, and the annular radiating fins 27 are formed. Friction heat released from the radiating fins 26 and the rectifying radiating fins 27 is transferred by the cooling air. As a result, the frictional heat of the magnetic powder type electromagnetic clutch 11 does not remain in the vicinity of the magnetic powder type electromagnetic clutch 11, and the temperature rise near the magnetic powder type electromagnetic clutch 11 is suppressed. In addition, since cooling air is positively introduced into the magnetic powder type electromagnetic clutch 11, heat radiation from the entire magnetic powder type electromagnetic clutch 11 to the outside air is promoted. Therefore, the magnetic powder type electromagnetic clutch 11 can be sufficiently and efficiently cooled.

FIGS. 8 to 11 show still another embodiment of the present invention. In the embodiment shown here, the heat pipe itself is provided with a fin structure for generating cooling air. That is, in the container 32 of the cylindrical heat pipe 31, the heat radiating portion 35 is pressed in the axial direction of the container 32 and is formed in a flat shape. The heat radiating portion 35 is formed in a blade shape that generates cooling air flowing in the radial direction of the clutch casing 12 when the heat pipe 31 revolves.

Since the magnetic powder type electromagnetic clutch 11 has the same structure as that of the above-described embodiment, the same reference numerals are given to the drawings, and the description thereof will be omitted. In this embodiment, the heat pipe 31 having the above structure is provided so as to be inclined with respect to the axial direction of the clutch shaft 17 so that the heat radiating portion 35 is closer to the clutch shaft 17 side than the heating portion 34. .

Therefore, in the structure shown in FIG. 8 to FIG. 11, the friction heat generated when the magnetic powder type electromagnetic clutch
Is transmitted to the heating section 34 of the container 32 of the heat pipe 31 protruding from the heat pipe 31. And the frictional heat is applied to the container 32
The radiating section 35 is formed by the working fluid 33 sealed inside.
Heat transported to the outside air.

When the heat pipe 1 revolves with the rotation of the clutch casing 12 of the magnetic powder type electromagnetic clutch 11, the heat radiating portion 35 is disengaged from the clutch casing 1.
2 generates cooling air flowing in the radial direction to transfer frictional heat released into the outside air.

On the other hand, the condensed working fluid 33 returns to the heating section 34 by the capillary pressure and the centrifugal force generated by the rotation of the clutch casing 12. This is because the heat radiating portion 35 is provided so as to be inclined with respect to the axial direction of the clutch shaft 17 so that the heat radiating portion 35 is closer to the clutch shaft 17 side than the heating portion 34 is.

As described above, in the still another embodiment, the magnetic powder type electromagnetic clutch 1 is also provided by the heat pipe 31.
Heat transfer of frictional heat generated from 1 is released into the outside air,
By cooling the magnetic powder type electromagnetic clutch 11, the cooling ability of the magnetic powder type electromagnetic clutch 11 can be improved. Further, by forming the cooling casing into a shape that generates cooling air flowing in the radial direction of the clutch casing 12, when the heat pipe 31 revolves with the rotation of the clutch casing 12, cooling air is generated, and the frictional heat released from the heat radiating portion 35 is generated. Is transferred by the cooling air. As a result, the frictional heat of the magnetic powder type electromagnetic clutch 11 does not remain in the vicinity of the magnetic powder type electromagnetic clutch 11, and the temperature rise near the magnetic powder type electromagnetic clutch 11 is suppressed. Further, since the cooling air is positively introduced into the magnetic powder type electromagnetic clutch 11, the magnetic powder type electromagnetic clutch 1
Radiation from the entire structure 1 to the outside air is promoted. Therefore,
The magnetic powder type electromagnetic clutch 11 can be sufficiently and efficiently cooled.

In each of the above embodiments, an example is shown in which a hollow cylindrical container having both ends sealed is used as the container 2 of the heat pipe 1. However, for example, a flat container is also used. A heat pipe may be used.

Further, in each of the above embodiments, the magnetic powder type electromagnetic clutch 11 is exemplified as the clutch provided with the heat pipe 1. However, the present invention is not limited to the above embodiment. Such a clutch that releases the generated frictional heat into the outside air may be used.

Further, a clutch, such as a wet friction clutch or a fluid clutch, which releases generated friction heat into a fluid such as lubricating oil may be used. By releasing the frictional heat into the outside air by the heat pipe, the amount of the frictional heat released into the fluid is reduced, and the load on the cooler for cooling the fluid is reduced by suppressing the temperature rise of the fluid. As a result, energy loss can be reduced.

In the above-described embodiment, the fins include an example in which the heat pipe 1 is provided with the rectifying radiating fins 6 and the plurality of radiating fins 9, and the number of annular radiating fins 26 and the number of rectifying radiating fins 27 are different. Although the example provided is shown, the present invention is not limited to the above-described embodiment, and may be any fin having a blade-like shape for generating a cooling wind for transferring frictional heat generated in the clutch.

Further, the heat radiating portion 35 is inclined with respect to the axial direction of the clutch shaft 17 so that the heat radiating portion 35 is closer to the clutch shaft 17 side than the heating portion 34 as shown in the above-mentioned still another embodiment. This may be performed in a heat pipe provided with fins.

[0049]

As described above, the clutch cooling mechanism of the present invention uses a heat pipe filled with a working fluid, and transports frictional heat generated in the clutch by the heat pipe and discharges it to the outside air. Therefore, the amount of heat transported to the outside air, that is, the amount of heat radiation increases, and the heat radiation ability of the clutch can be greatly improved.

Further, by providing a plurality of blade-like fins for generating cooling air flowing in the radial direction of the clutch member by rotating the clutch in the heat radiating portion of the heat pipe,
Cooling air can be actively supplied to the heat radiating portion of the heat pipe, and as a result, the amount of frictional heat released through the heat pipe increases, and at the same time, the released frictional heat does not remain in the vicinity of the clutch. Temperature rise is suppressed,
The heat dissipation capacity of the clutch can be further improved.

Further, the heat radiating portion of the heat pipe is formed in a blade shape for generating cooling air flowing in the radial direction of the clutch member by rotation of the clutch, so that the fin for generating cooling air is provided. Cooling air can be actively supplied to the heat radiating portion of the heat pipe, and as a result, the amount of frictional heat released through the heat pipe increases, and at the same time, the released frictional heat does not remain in the vicinity of the clutch. Is suppressed, and the heat radiation ability of the clutch can be further improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of a heat pipe of the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a schematic sectional view showing an example of a magnetic powder type electromagnetic clutch provided with a heat pipe.

FIG. 4 is a sectional view taken along line IV-IV of FIG. 3;

FIG. 5 is a perspective view showing another embodiment of the heat pipe of the present invention.

FIG. 6 is a schematic sectional view showing an example of a magnetic powder type electromagnetic clutch provided with a heat pipe.

FIG. 7 is a sectional view taken along line VII-VII of FIG. 6;

FIG. 8 is a perspective view showing still another embodiment of the heat pipe of the present invention.

FIG. 9 is a plan view of the same.

FIG. 10 is a schematic sectional view showing an example of a magnetic powder type electromagnetic clutch provided with a heat pipe.

FIG. 11 is a sectional view taken along line XI-XI of FIG. 10;

FIG. 12 is a diagram showing a conventional technique.

FIG. 13 is a diagram showing a conventional technique.

[Explanation of symbols]

1 ... heat pipe, 2 ... container, 3 ... working fluid,
4 heating unit, 5 radiating unit, 6 rectifying radiating fin,
9: radiation fins, 11: magnetic powder type electromagnetic clutch, 1
2 ... clutch casing, 15 ... excitation coil, 17
... Driven rotor, 19 ... Magnetic powder particles, 26 ... Radio radiation fin, 27 ... Rectification radiation fin.

 ────────────────────────────────────────────────── ─── Continued on front page (72) Inventor Kazuhiko Goto 1-5-1, Kiba, Koto-ku, Tokyo Inside Fujikura Co., Ltd.

Claims (3)

[Claims] 1. A cooling structure for a clutch, comprising: a driving-side member that is rotationally driven; and a driven-side member to which torque is transmitted by being selectively engaged with the driving-side member. One end of the heat pipe is provided so as to be able to transfer heat in the vicinity of an engagement portion with at least one of the driven side members and the other member, and the other end of the heat pipe is provided so as to be able to transfer heat with outside air. A cooling structure for a clutch, characterized in that: 2. A vane-like fin is provided at the other end of the heat pipe to generate cooling air having a velocity component directed in a radial direction of the one of the members when the heat pipe revolves. The cooling structure for a clutch according to claim 1, wherein: 3. The other end of the heat pipe is formed into a blade shape that generates cooling air having a velocity component directed in a radial direction of any of the members when the heat pipe revolves. The cooling structure for a clutch according to claim 1, wherein: