JPH0593713U - Compressed air supply joint - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a joint for supplying compressed air which completely prevents the compressed air sent to the drill at the tip from hitting the bearing. [Structure] In order to inject compressed air to the tip of the drill through the hollow shaft 11 of the drilling motor 10, the hollow shaft 11 is provided at the center of one end surface of the drilling motor 10.
A joint 20 for supplying compressed air coaxially with the hollow shaft 11, the end of the hollow shaft 11 penetrating through a bearing 40 supporting the hollow shaft 11 and protruding toward the joint 20 side. The pipe 30 to be inserted therein is heat-tightly fitted to the joint 20,
The air escape passage 21 is opened from the outlet end face to the side face.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an air supply joint in which compressed air sent to a high speed rotating body does not damage a bearing of the rotating body.

[0002]

[Prior Art]

 Description will be made with reference to FIG. Conventionally, a method of injecting compressed air to the tip of a drill through a hollow shaft 11 of a hole-driving motor 10 has been used as a measure to prevent a stoppage of an automatic machine for punching holes in a door weather strip and inserting a clip. A compressed air supply joint 20 is screwed coaxially with the hollow shaft 11 at the center of one end surface of the hole-drilling motor 10.

Although this conventional method was extremely effective for the chocolate stop of the automatic machine, the joint 20 faces the bearing 40 of the hollow shaft 11, and the compressed air ejected from the outlet of the joint 20 is There was a problem that the bearing 40 of the hole making motor 10 was also blown out of the grease and the life of the bearing 40 was significantly shortened.

[0004]

[Problems to be solved by the device]

 The problem to be solved is that the compressed air hits the motor bearings and blows out grease.

[0005]

[Means for Solving the Problems]

 A description will be given with reference to FIGS. In order to inject compressed air to the tip of the drill through the hollow shaft 11 of the drilling motor 10, the present invention is screwed coaxially with the hollow shaft 11 at the center of one end face of the drilling motor 10. In the compressed air supply joint 20, the end portion of the hollow shaft 11 is penetrated through the bearing 40 that supports the hollow shaft 11 to protrude toward the joint 20 side, and is inserted into the hollow shaft 11 on the inner surface of the joint 20. The pipe 30 is airtightly shrink-fitted, and the joint 20 is provided with an air escape passage 21 that opens from the outlet end face to the side face.

[0006]

【Example】

 An embodiment will be described. Reference numeral 10 is a hole making motor, 11 is a hollow shaft that is driven by the motor 10 and rotates at a high speed (20,000 rpm), and 20 is a joint. It is screwed coaxially with the hollow shaft 11 at the center of the end face. In addition, the end of the hollow shaft 11 penetrates the bearing 40 that is supported, and the protrusion 12 is formed on the joint 20 side. Reference numeral 30 is a nozzle pipe for guiding air from the joint 20 to the hollow shaft 11, one end of which is airtightly fitted and fixed to the inner surface of the joint 20 by shrink fitting 31, and the other end of which is inserted into the hollow shaft 11. I am doing it. Further, the joint 20 is provided with an air escape passage 21 which communicates from the outlet end face to the side face.

The operation will be described with reference to the drawings. The pipe 30 is inserted into the hollow shaft 11 so as not to be in contact with the hollow shaft 11, and the joint 20 is screwed coaxially with the hollow shaft 11 at the center of one end surface of the hole-forming motor 10. In this state, when compressed air is sent to the tip of the drill through the joint 20 and the hollow shaft 11 and jetted, the air does not hit the bearing 40, the grease is not blown off, and the air pressure in the motor 10 becomes excessive. When rising, the air can escape through the air escape passage 21. At that time, since the end of the hollow shaft 11 penetrates the bearing 40 and projects toward the joint 20, the hollow shaft 11 flows backward. The air that does not come into direct contact with the bearing 40 does not shorten its life.

[0008]

[Effect of the device]

 Since the present invention is configured as described above, it is extremely effective for the automatic stop of the automatic machine and completely prevents the compressed air sent to the drill at the tip from hitting the bearing and blows out the grease. The problem of shortening the life of the bearing 10 is solved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a usage state of a conventional example.

FIG. 2 is a sectional view showing an embodiment of the present invention.

FIG. 3 is a sectional view showing a usage state of the present invention.

[Explanation of symbols]

 10 Motor for Drilling 11 Hollow Shaft 12 Projection 20 Joint 21 Air Release Passage 30 Pipe 31 Shrink Fit 40 Bearing

Claims (1)

[Scope of utility model registration request] 1. A center of one end face of a drilling motor (10) for injecting compressed air to a drill tip through a hollow shaft (11) of the drilling motor (10),
In a joint (20) for supplying compressed air, which is screwed coaxially with the hollow shaft (11), the hollow shaft (1
The pipe (30) is inserted into the hollow shaft (11) on the inner surface of the joint (20) in an airtight manner by projecting the end of (1) through the bearing (40) supporting the end of the joint (20). Shrink fit, joint (20)
In addition, the air escape passage (2
1) Open joint for compressed air supply.