JPH06257559A - Pump directly coupled to drive shaft - Google Patents

Abstract

PURPOSE:To quickly fit a drive shaft into a pump shaft by providing a key groove as a recess and to stop liquid leaks from the shaft sealing device of a pump. CONSTITUTION:A pump 2 is mounted on one of the flanges 1a of a bracket 1 and a bearing 3 is mounted in a bearing housing 1b at the other flange. In the bracket 1, a shaft sealing device 4 such as an oil seal is disposed between the flange 1a and the bearing 3. A drive shaft 6 having a female tapped hole 4 through the shaft sealing device 4 is directly coupled to the pump shaft 7 of the pump 2 by means of a key 8. A through hole 11 located in the depth of the key groove 9 of the female tapped hole 5 is provided in a position at which it is closed by the inner ring of the bearing 3, and an air groove 12 parallel to the key groove 9 is provided in the bottom of the key groove 9 of the female tapped hole 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for directly connecting a pump shaft of a pump to a female hole of a drive shaft of an electric motor or a gear device.

[0002]

2. Description of the Related Art FIG. 2 is a sectional view of a conventional example. In the figure, a pump 2 is attached to one flange 1a of a bracket 1 of a driving machine such as an electric motor, and a bearing 3 is attached to the other bearing box 1b.
Install. The bracket 1 includes a flange 1a and a bearing 3
A shaft seal device 4 such as an oil seal is arranged between the two.
A drive shaft 6 provided with a female hole 5 penetrating the shaft sealing device 4.
Is directly connected to the pump shaft 7 of the pump 2 and is connected by the key 8. Further, it is located at a position deeper than the key groove 9 of the female hole 5 and is located on the side of the bearing 3 opposite to the shaft sealing device 4 side, and the radial through hole 3 is formed.
1 is provided.

According to such a structure, the through hole 31 is
The key groove 9 serves as an escaper for a blade such as a slotter, which facilitates the work and improves the machining accuracy, and also serves as an air bleeder when the pump shaft 7 is fitted into the drive shaft 6 for quick assembly. Note that, for example, the cross section of the key is 10 mm x 8 mm
At this time, the gap on the upper surface of the key is usually 0.3 mm, and does not play a role of air bleeding much.

[0004]

According to the above-mentioned conventional example, there are advantages that the working is easy, the working accuracy is improved, and the assembling is quick. However, when the shaft sealing device (not shown) inside the pump 2 is deteriorated or damaged and the liquid handled by the pump 2 leaks, the liquid enters the drive unit through the gap on the upper surface of the key 8 and the through hole 31. The important thing is to damage the driving machine.

An object of the present invention is to have a key groove escape,
It is an object of the present invention to provide a pump directly connected to a drive shaft, in which the drive shaft and the pump shaft can be fitted quickly and the liquid can be prevented from leaking from the pump shaft sealing device.

[0006]

According to another aspect of the present invention, there is provided a drive shaft direct coupling type pump comprising: a bracket for mounting the pump on one flange and a bearing for the other bearing box; and a shaft arranged between the flange and the bearing. From a sealing device, a drive shaft having a female hole that penetrates the shaft sealing device and is directly connected to the pump shaft of the pump and is coupled with a key, and a radial through hole located deep in the key groove of the female hole. In the pump directly connected to the drive shaft, the through hole is provided at a position closed by the inner ring of the bearing, and an air groove is provided at the bottom of the key groove of the female hole or the bottom of the key groove of the pump shaft.

According to a second aspect of the present invention, there is provided a drive shaft direct-coupling type pump, a bracket for mounting the pump on one flange and a bearing for the other bearing box, a shaft sealing device arranged between the flange and the bearing, and this shaft. A drive shaft directly connected to the pump shaft of the pump by penetrating the sealing device and having a female hole for connecting with a key, and a drive shaft directly connected type consisting of a radial through hole located deep in the key groove of the female hole In the pump, the through hole is provided at a position closed by the inner ring of the bearing, and an axial air groove is provided on the bottom surface or the top surface of the key.

[0008]

According to this structure, the through hole serves as a relief of the blade of the key groove, which facilitates the work and improves the machining accuracy. When the pump shaft is fitted into the drive shaft, the through hole has a female hole. The air groove at the bottom of the key groove (or the air groove at the bottom of the key groove of the pump shaft or the air groove at the bottom surface or the top surface of the key) serves as an air bleeder for quick assembly. Moreover, even if the liquid leaks from the shaft sealing device of the pump, the through hole is closed by the inner ring of the bearing, and the liquid is prevented from entering the drive machine, which is not important. In addition, the key groove of the female hole and the air groove of the bottom can be machined at the same time with one blade having such a shape.

[0009]

FIG. 1 is a sectional view of the first embodiment with a rotation-illustrated sectional view added thereto, and FIG. 3 is a sectional view of a main part of the second embodiment. In the conventional example and in each drawing, those denoted by the same reference numerals have approximately the same function, and duplicate explanation may be omitted. In FIG.
One flange 1 of a bracket 1 of a drive machine such as an electric motor
The pump 2 is attached to a and the bearing 3 is attached to the other bearing housing 1b. A shaft seal device 4 such as an oil seal is arranged on the bracket 1 between the flange 1 a and the bearing 3. A drive shaft 6 having a female hole 5 penetrating the shaft sealing device 4 is directly connected to a pump shaft 7 of the pump 2 and is connected by a key 8.

As a characteristic structure of the first embodiment, there is a female hole 5.
A radial through hole 11 is provided at the back of the key groove 9 at a position closed by the inner ring of the bearing 3. And female hole 5
An air groove 12 parallel to the key groove 9 is provided on the bottom of the key groove 9. Instead of the air groove 12, an air groove parallel to this key groove may be provided at the bottom of the key groove of the pump shaft 7. According to such a structure, the through hole 11 plays a role of escaping a cutting tool such as the slotter of the key groove 9, so that the working is easy and the working accuracy is improved. When the pump shaft 7 is fitted into the drive shaft 6, the air groove 12 at the bottom of the key groove 9 of the female hole 5 (or the air groove at the bottom of the key groove of the pump shaft 7) serves as an air bleeder for quick assembly. . Moreover, even if the liquid leaks from the shaft sealing device of the pump 2, the through hole 11 is closed by the inner ring of the bearing 3 to prevent the liquid from entering the drive machine. The key groove 9 of the female hole 5 and the air groove 12 of the bottom can be machined simultaneously with a single tool having such a shape.

In the second embodiment shown in FIG. 3, the drive shaft 6 having a female hole is directly connected to the pump shaft 7 and connected by a key 38. An axial air groove 32 is provided on the bottom surface of the key 38.
The other structure is the same as that of FIG. The air groove may be on the top surface instead of the bottom surface. According to such a structure, there are the same effects as those in FIG.

[0012]

According to the pump of the present invention which is directly connected to the drive shaft, the through hole plays a role of escaping the tool of the key groove to facilitate the work and improve the machining accuracy, and the pump shaft is connected to the drive shaft. When fitting, the air groove at the bottom of the key groove of the female hole (or the air groove at the bottom of the key groove of the pump shaft or the air groove at the bottom surface or the top surface of the key) plays the role of air bleeding, and the effect is that assembly can be done quickly. is there. Moreover, even if the liquid leaks from the shaft seal device of the pump, the through hole is closed by the inner ring of the bearing, and the liquid is prevented from entering the drive machine, which is not important. In addition, the key groove of the female hole and the air groove of the bottom can be machined at the same time with one blade having such a shape.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a first embodiment in which a rotation-illustrated cross-sectional view is added.

FIG. 2 is a sectional view of a conventional example.

FIG. 3 is a cross-sectional view of a main part of the second embodiment.

[Explanation of symbols]

 1a Flange 1b Bearing box 2 Pump 3 Bearing 4 Shaft sealing device 5 Female hole 6 Drive shaft 7 Pump shaft 8 Key 9 Key groove 11 Key groove 12 Air groove 32 Air groove 38 Key

Claims (2)

[Claims] 1. A bracket for mounting a pump on one flange for mounting a bearing on the other bearing box, a shaft sealing device arranged between the flange and the bearing, and a shaft sealing device penetrating the shaft sealing device for the pump. A drive shaft direct-connection type pump comprising a drive shaft directly connected to a pump shaft and having a female hole to be connected by a key, and a radial through hole located deeper in a key groove of the female hole, wherein the through hole is the bearing. A pump directly connected to a drive shaft, which is provided at a position to be closed by the inner ring of the drive shaft, and an air groove is provided at the bottom of the key groove of the female hole or the bottom of the key groove of the pump shaft. 2. A bracket for mounting a pump on one flange and mounting a bearing on the other bearing box, a shaft sealing device arranged between the flange and the bearing, and a shaft sealing device penetrating the shaft sealing device for the pump. A drive shaft direct-connection type pump comprising a drive shaft directly connected to a pump shaft and having a female hole to be connected by a key, and a radial through hole located deeper in a key groove of the female hole, wherein the through hole is the bearing. A drive shaft direct connection type pump, characterized in that it is provided at a position closed by the inner ring, and an axial air groove is provided on the bottom surface or the top surface of the key.