JPS6132198Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cooling device for a belt power transmission device installed in a motorcycle or the like.

Conventionally, Utility Model Application Publication No. 165968/1983 is a belt power transmission device that houses two pulleys, a belt wound between these two pulleys, and a clutch in a cavity formed by a case and a cover. The gazette is publicly known. In this type of belt power transmission device, the belt, pulley, and clutch generate heat due to friction, so it is necessary to forcibly cool them with air.

The present invention has been developed in view of the above circumstances, and it is an object of the present invention to provide a cooling device for a belt power transmission device that can effectively cool not only the belt and pulley but also the clutch in particular.

An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a schematic side view of a motorcycle to which the present invention is applied. In the figure, 1 is a vehicle body, and an engine 3 is installed below a rear cover 2, and there is a space between the engine 3 and a rear wheel 4. A belt power transmission device 5 is interposed therein. The belt power transmission device 5
As shown in FIG. 2, a cover 7 and a case 8 are fixed to each other to form a closed cavity 6, and a drive pulley 1 mounted on a crankshaft 9.
0, a driven pulley 12 and a clutch 13 attached to a common rotating shaft 11, a belt 14 wound between both pulleys 10 and 12, and a drive shaft 15 to which the rotating shaft 11 and the rear wheel 4 are attached. and a gear transmission mechanism 16 interposed between.

Between the joint surfaces of the cover 7 and the case 8 is a third
As shown in the figure, a partition plate 17 made of packing is interposed, and the partition plate 17 ensures airtightness between the joint surfaces, and the inside of the gap chamber 6 is connected to the chamber A along the pulley axial direction. It is divided into two rooms: Room B and Room B.

A communication passage 18 is provided on the outer surface of one end side of the cover 7 to communicate the chamber A and the chamber B, one end 18a of which opens in the cover 7 facing the side surface of the drive pulley 10, and the other end 18a opens to the side surface of the drive pulley 10. It opens into room A.

A portion 7a of the cover 7 facing the clutch 13 is bulged into a bowl shape that follows the outer shape of the clutch 13 at a predetermined distance. On the inner surface of the portion 7a facing the clutch 13, a large number of guiding/radiating fins 19 are provided radially at intervals in the circumferential direction. These induction and heat radiation fins 19 have the function of guiding the cooling air sent between the clutch 13 and the cover 7 toward the center of the clutch 13, and the function of radiating the heat retained in the cooling air to the cover 7 side. . Cooling air is applied to the central end of the fin 19 as shown in FIG.
The guide protrusions 2 are introduced into the communicating holes 20 provided at intervals in the circumferential direction on the surface facing the cover 7 of No. 3.
1 is provided for each. The guide hole 20 communicates the inside and outside of the clutch 13. An axial fan 1 is provided on the outer peripheral surface of the clutch 13.
3a is provided, and cooling air is sent into the gap between the clutch 13 and the cover 7 by the axial fan 13a. The driven pulley 12 is provided with a large number of communication holes 22 at intervals in the circumferential direction for communicating the chambers A and B, and the communication holes 22 communicate with the inside of the clutch 13.

As shown by the broken line arrows in FIGS. 2 and 3, the communication path 1 is
The drive pulley 10 is cooled by the cooling air drawn into the chamber B from one end 18a of the drive pulley 8. This cooling air contacts the cover 7 and releases heat to the outside. The cooling air guided to the rear of chamber B in this way is passed through the driven pulley 1.
2 and clutch 13, these driven pulleys 1
2 and clutch 13 are cooled. In this case, the cooling air is blown into the gap between the outer surface of the clutch 13 and the inner surface of the cover 17, as shown by the dashed arrow in FIGS. 3 and 4, by the action of the axial fan 13a of the clutch 13. This is guided toward the center of the clutch 13 by the action of the induction/radiation fin 19. During the induction, the heat retained by the cooling air is transferred to the cover 7 via the fins 19 and radiated to the outside, that is, the cooling air is transferred to the fins 19 and the cover 7.
It is cooled by exchanging heat with the outside air through the air. The cooling air after cooling is introduced and guided into the communication hole 20 of the clutch 13 by the action of the guide protrusion 21,
After cooling the inside of the clutch 13 and also cooling the driven pulley 12, it flows into the chamber A through the communication hole 22 of the pulley 12. Then, by the action of the centrifugal fan 12a of the driven pulley 12, the cooling air is sent to the front side of the chamber A, passes through the communication passage 18 from the other end 18b of the communication passage 18, and flows into the chamber B from the one end 18a.

As described in detail above, the cooling device for the belt power transmission device of the present invention cools the clutch by contacting the outside of the clutch, and sends the cooling air whose temperature has increased between the clutch and the cover using the axial fan of the clutch. After being fed, the cooling air is guided to the center of the clutch by induction and heat dissipation fins, and the heat retained in the cooling air is transferred to the cover via the fins, and the heat is radiated from the cover to the outside air, so the cooling air is reliably cooled. . and,
The cooling air after cooling is guided to the communication hole of the clutch by the action of the guide protrusion to cool the inside of the clutch, so the clutch can be reliably and efficiently cooled from the inside and outside. .

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a schematic side view of a motorcycle to which the present invention is applied, FIG. 2 is a horizontal sectional view of a belt power transmission device equipped with the cooling device of the present invention, and FIG. FIG. 3 is a cutaway side view of the main part, and FIG. 4 is a partially cutaway plan view showing the main part enlarged. 5...Belt power transmission device, 6...Void chamber, 7
...cover, 7a...portion of cover facing the clutch, 8...case, 10, 12...pulley,
13... Clutch, 13a... Axial flow fan of clutch, 14... Belt, 19... Induction and heat dissipation fin, 20... Communication hole of clutch, 21... Guide protrusion.

Claims (1)

[Scope of utility model registration request] In a belt power transmission device comprising two pulleys, a belt wound between these two pulleys, and a clutch housed in a cavity constituted by a case and a cover, the belt faces the clutch of the cover. An axial fan is provided on the outer circumferential side of the clutch for feeding cooling air between the clutch and the cover, and an axial fan is provided on the outer circumferential side of the clutch, and A communication hole communicating between the inside and outside of the clutch is provided on the surface facing the cover, and a plurality of induction and heat dissipation fans are provided radially with gaps in the circumferential direction on the surface of the cover facing the clutch. A cooling device for a belt power transmission device, characterized in that guide protrusions are provided at the center-side ends of these fins to introduce and guide cooling air into the communication holes of the clutch.