JPH0522856U - Coupling hub - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a coupling hub in which an air vent groove can be provided without processing. A coupling hub having a shaft fitting hole portion 13 concentric with the shaft portion 11 at one end of the shaft portion 11, wherein an air vent groove 14 extending in the axial direction is formed on an inner peripheral surface of the shaft fitting hole portion 13. Formed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a coupling hub used for connecting a drive side wheel of a fluid type fan coupling to a rotary shaft of a water pump in an internal combustion engine.

[0002]

[Prior Art]

 Conventionally, when connecting a drive side wheel of a fan coupling to a rotary shaft of a water pump, for example, a coupling hub as shown in Japanese Utility Model Laid-Open No. 61-157125 is used. The coupling hub 20 will be described with reference to FIGS. 3 and 4. The coupling hub 20 includes a shaft portion 11 and a flange portion 12. The coupling hub 20 is formed with a shaft fitting hole portion 13 concentric with the shaft portion 11 and an air vent hole 15 for communicating the inside of the shaft fitting hole portion 13 with the outside. The air vent hole 15 is provided to prevent the internal air from being compressed when the rotary shaft of the water pump is fitted into the shaft fitting hole portion 13 so that it becomes difficult to fit the rotary shaft.

[0003]

[Problems to be solved by the device]

 However, in the conventional coupling hub 20, the air vent hole 15 needs to be machined after being manufactured by cold forging or the like, which is a problem in reducing the manufacturing cost. Further, the air vent hole 15 cannot be made small due to processing, and because only one hole was provided for the purpose of use, the mass balance around the center of rotation of the coupling hub may be lost, and vibration or the like may occur due to the rotation of the coupling hub. . Furthermore, when water penetrates into the shaft fitting hole 13 through the gap between the rotary shaft of the water pump and the inner peripheral surface of the shaft fitting hole 13, the drainage does not work properly and rusting occurs. there were.

The present invention has been made to solve the above-mentioned conventional problems, and an air vent groove can be provided without requiring machining, and water that has penetrated into the shaft fitting hole portion during use can be discharged to the outside. The object is to provide a coupling hub that can be used.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention is a coupling hub having a shaft fitting hole portion concentric with the shaft portion at one end of the shaft portion, wherein an axial direction is provided on an inner peripheral surface of the shaft fitting hole portion. The air vent groove is formed along the line.

[0006]

[Action]

 At the stage of manufacturing the coupling hub by cold forging or the like, the air vent groove can be formed on the inner peripheral surface of the shaft fitting hole, and it is easy to provide a plurality of air vent grooves. Further, the shaft can be fitted into the shaft fitting hole while releasing the air inside by the air vent groove formed on the inner peripheral surface of the shaft fitting hole. Furthermore, since the water discharge path is formed by the shaft fitted in the shaft fitting hole and the air vent groove formed in the inner peripheral surface of the shaft fitting hole, the infiltration of water into the shaft fitting hole is suppressed. The invaded water can be discharged to the outside. In particular, when a plurality of air vent grooves are provided, the ingress of water is reliably discharged to the outside.

[0007]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a sectional view taken along the line II of FIG. 2 showing a coupling hub according to the present invention, and FIG. 2 is a right side view of FIG. 1, in which the same parts as those of the conventional example are the same. A reference numeral is attached and the description is omitted.

The coupling hub 10 includes a shaft portion 11 and a flange portion 12.

The coupling hub 10 is formed with a shaft fitting hole 13 concentric with the shaft 11. The inner peripheral surface of the shaft fitting hole 13 has at least two air vent grooves 14 along the axial direction. Are formed at equal intervals, and the air vent grooves 14 are gradually deeper from the inner end of the shaft fitting hole portion 13 toward the opening end. Such a coupling hub 10 is manufactured by cold forging or the like.

Next, the operation of the coupling hub 10 thus configured will be described.

When assembling the coupling hub 10, first, the rotary shaft of the water pump (not shown) is fitted into the shaft fitting hole portion 13. During the fitting process of the rotary shaft, the air inside the shaft fitting hole portion 13 is The air vent groove 14 provided on the inner peripheral surface of the shaft fitting hole portion 13 allows the air to escape to the outside and is not compressed. Therefore, it is easy to fit the rotary shaft.

After fitting the rotary shaft, a coupling main body of a fan coupling (not shown) is rotatably mounted on the shaft portion 11 via a bearing, and the drive side wheel is fixed to the coupling main body and the flange portion A drive pulley (not shown) is fixedly attached to 12, and the assembly is completed.

Further, when the coupling hub 10 is used (when the drive side wheel of the fan coupling and the rotating shaft of the water pump are rotated by imparting rotation to the flange portion 12 via the drive pulley), the water pump is temporarily operated. Even if a part of the cooling water leaks from the cooling shaft and flows to the coupling hub 10 side along the rotating shaft, the cooling water is generated by the outer peripheral surface of the rotating shaft and the air vent groove 14 formed on the inner peripheral surface of the shaft fitting hole 13. Since a plurality of drainage channels are formed at equal intervals, infiltration of water into the shaft fitting hole portion 13 is suppressed. Even if water enters the shaft fitting hole 13, it is guided to the air vent groove 14 by centrifugal force and discharged to the water pump side. In this case, the outer portion of the air vent groove 14 in the radial direction of the coupling (bottom portion of the air vent groove 14) is formed so as to expand outward in the radial direction of the coupling hub in the drainage direction (on the water pump side). Drainage from inside the part 13 is performed better.

Further, since the air vent grooves 14 are formed at equal intervals on the inner peripheral surface of the shaft fitting hole portion 13, the mass balance around the rotation center of the coupling hub 10 is not lost. If there is no such possibility (for example, when the rotating shaft has a small diameter and the position of the air vent groove 14 is close to the rotation center), one air vent groove 14 may be provided, and when multiple air vent grooves 14 are provided, do not provide them at equal intervals. May be.

In the above embodiment, the coupling hub that connects the rotary shaft of the water pump and the driving wheel of the fluid fan coupling in the internal combustion engine has been described, but the invention is also applicable to a spigot joint. Needless to say.

[0017]

[Effect of the device]

 As described above, according to this invention, since the air vent groove is formed along the axial direction on the inner peripheral surface of the shaft fitting hole, it can be manufactured by cold forging etc. without the need to process the air vent hole after manufacturing as in the past. be able to. Further, when the shaft is fitted, the air can be released to the outside without being compressed, so that the shaft can be fitted easily. Further, since the drainage channel is formed by the air vent groove and the shaft fitted in the shaft fitting hole portion, it is possible to suppress the intrusion of water into the shaft fitting hole portion, and the infiltrated water can be discharged to the outside. In particular, if multiple air vent grooves are provided, the ingress of water will be reliably discharged to the outside, and rust inside the shaft fitting hole can be prevented. Therefore, it is possible to reduce the manufacturing cost while maintaining the ease of inserting the shaft, and to prevent rusting and enable long-term use without maintenance.

[Brief description of drawings]

1 is a sectional view taken along line 1-1 of FIG. 2 showing a coupling hub according to an embodiment of the present invention.

FIG. 2 is a right side view of FIG.

FIG. 3 shows a coupling hub of a conventional example, which is 3-3 in FIG.
It is a line sectional view.

FIG. 4 is a right side view of FIG.

[Explanation of symbols]

 10 Coupling Hub 11 Shaft 13 Shaft Fitting Hole 14 Air Venting Groove

Claims (1)

[Scope of utility model registration request] 1. A coupling hub having a shaft fitting hole concentric with the shaft at one end of the shaft, wherein an air vent groove is formed in an inner peripheral surface of the shaft fitting hole along the axial direction. Is a coupling hub.