JPS63260732A - Alignment of shaft to hole - Google Patents

Abstract

PURPOSE:To improve productivity and ensure labor saving by nearing and drooping the shaft made of ferromagnetic material above a hole, and then arranging a magnet under the hole for attracting the shaft to the hole by the magnetic force so as to perform the easy and sure alignment. CONSTITUTION:A valve 5 is hung by the claw 6 of a valve inserting machine 4 so that the lower end of a valve shaft portion 5b approaches the upper end of a valve guide 2, and the magnetic line is equally distributed around a center shaft from the upper portion of the value guide 2 to the upper end of a magnet 8 so as to attract the valve made of ferromagnetic material to the valve guide. Since the valve 5 hung by the claw 6 is set to be easily movable, it is possible to effectively produce the attracting force. The alignment is finished after the elapse of a constant time and the valve shaft 5b is pushed into the hole of the valve guide 2 by a pushing piece 7, thus the assembly to a cylinder head 1 is finished. Therefore, it is possible to effectively perform an easy and sure alignment so as to improve the productivity and ensure labor saving.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a shaft suitable for aligning the shaft with the mating hole in the process of assembling the shaft and the hole with little mutual clearance during insertion. The present invention relates to a method for aligning holes and holes, and is particularly effective in realizing automation of assembly work, for example, in the assembly of automobile parts.

[Conventional technology]

Assembling the shaft into the hole includes, for example, assembling the intake and exhaust valves of an engine to the cylinder head, but conventionally this has been done manually by an operator.

For this reason, there is a strong desire to mechanize such work, but 2
In order to realize mechanization, it is necessary to align the shaft and hole. Conventional methods are used to achieve this kind of mechanization.

(1) Position the large side using a high-precision jig, and align the axis by moving the axis using a high-precision robot, etc.9
Assemble.

(2) A guide member is positioned and fixed at a part of the hole or a similar position, and the shaft is guided by the guide member for centering and assembly.

(3) Suck in air through the hole facing the shaft, center the shaft, and assemble.

Other methods have been proposed.

[Problem that the invention seeks to solve]

However, in method (1) above, even if a high-precision jig is used for centering, there is a problem that alignment cannot be performed for items whose manufacturing precision is not good for the parts to be assembled. there were.

In addition, method (2) above requires work steps such as positioning and fixing the guide member during the second assembly and removing the guide member after centering, which makes the structure complex and increases the risk of failure. There was an inconvenience that could have been the cause.

Furthermore, in method (3) above, since air is sucked in, even if it becomes a vacuum, the maximum weight is 1 kg/c++!
It is not possible to generate the above gas flow, and the centripetal force against the hole in the shaft is limited, making it difficult to perform centering effectively.

[Means for solving problems]

The present invention has been devised in view of the above, and its gist is that two shafts made of ferromagnetic material are suspended above and close to the holes, while two magnets are arranged below the holes,
A method for centering a shaft and a hole, characterized in that the shaft is centripetal to the hole by the magnetic force of the magnet.

[Effect]

According to the present invention, a shaft made of ferromagnetic material that hangs above the hole and close to the hole has a distribution of magnetic force acting above the hole from a magnet placed below the hole (of course near the center of the hole). The shaft is centripetal to the hole, and the axis and hole are aligned by the strong force.

C Embodiment) Two embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

FIGS. 1 and 2 show an embodiment in which the present invention is applied to an automatic assembly apparatus for assembling intake and exhaust valves to a cylinder head in an engine assembly process.

In FIG. 1, 1 is a cylinder head that is positioned and fixed to an automatic assembly device (not shown), and 2 is a cylindrical valve guide that is installed in advance on the cylinder head 1.

3 is an annular stem seal attached to the lower end of the valve guide 2 in the figure; 4 is a valve insertion machine located above the cylinder head 1 and installed in an automatic assembly device (not shown); 5 is a ferromagnetic material such as iron. This is an engine valve which is made of a material and has a valve stem part 5b facing downward and a valve head part 5a which is locked to a valve insertion machine. The valve insertion machine 4 has a claw 6 that locks the valve head portion 5a and suspends the valve 5 so that the valve stem portion 5b hangs above the valve guide 2 so as to be movable in the radial direction;
It has a stop 7 for pushing the valve 5 into the valve guide 2. Further, 8 is a rod-shaped magnet provided in an automatic assembly device (not shown), and this magnet 8 is arranged directly below the valve guide 2 in the vertical direction.

To explain the operation of this embodiment configured as described above, first, the valve 5 is suspended by the claw 6 of the valve inserter 4, and the lower end of the valve shaft portion 5b is brought close to the upper end of the valve guide 2 from above. Then, above the valve guide 2, the lines of magnetic force are evenly distributed with respect to the central axis from above the valve guide 2 toward the upper end of the magnet 8 (of course, the center of the valve guide is strongest), so the 1 ferromagnetic material The valve 5 consisting of is centered with respect to the valve guide 2.

In addition, the centripetal action as described above is because the valve 5 suspended by the claws is easy to move.

This can be effectively generated.

Since the alignment described above is completed after a certain period of time has elapsed, the valve stem 5b of the valve 5 is
Push it into the hole of valve guide 2.

The assembly of the valve 5 to the cylinder head 1 is completed.

In addition, in engines, the intake valve and exhaust valve are usually assembled to the cylinder head with a valve angle, but by changing the holding angle of the cylinder head when assembling the intake valve and when assembling the exhaust valve, the intake and exhaust valves can be easily assembled. It is possible to realize automatic valve assembly.

According to the above embodiment, since the assembly of the valve 5 can be automated, it is possible to improve productivity and save labor.

Furthermore, it is possible to generate centripetal force mechanically more easily and at a lower cost than in the past.

It goes without saying that the present invention is not limited to the above-described embodiments, and that various modifications can be made without departing from the gist of the present invention.

〔Effect of the invention〕

As described above in detail along with the embodiments, according to the present invention, alignment can be performed mechanically more easily, effectively, and reliably than in the past, thereby achieving improved productivity and labor savings. This has the effect of providing an effective method for aligning the shaft and the hole.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an embodiment of the present invention, and FIG. 2 is an explanatory diagram of its operation. 2...Valve guide, 5...Pulp. 6...Claw, 8...Magnet tube゛1
Figure Z

Claims (1)

[Claims] A shaft made of a ferromagnetic material is suspended above the hole in close proximity to the hole, while a magnet is arranged below the hole, and the magnetic force of the magnet causes the shaft to be centripetal to the hole. How to align the and hole