JPS58211838A - Assembly method and device of shaft having eccentric part - Google Patents

Abstract

PURPOSE:To automatically perform assembly work of a shaft having an eccentric part, by inserting an eccentric shaft into a fitting assembly jig, to which an outer ring is set, and rotating the shaft with a reference axis as the center without limiting the movement in the shaft direction then assembling the shaft through fitting with gravity or the like when both center axes of the outer ring and the eccentric shaft are aligned. CONSTITUTION:After an outer ring 2 is set to a fit assembly jig 3, an eccentric shaft 1 is inserted into said jig 3, and if the shaft 1 is rotated with a reference axis (a) as the center by the method not limiting movement of the shaft 1 in the axial direction, a center axis (c) of the ring 2 is aligned to a center axis (b) of an eccentric part of the shaft 1, here dropping of the shaft 1 into an internal diameter part of the ring 2 by gravity is utilized. Then if the shaft 1 is rotated theta deg. clockwise, the axis (b) of the shift 1 is aligned to the axis (c) of the ring 2.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for assembling a machine whose component is a shaft having an eccentric portion.

Conventionally, in the assembly of machines such as rotary compressors, where an eccentric shaft and a piston fitted to the outer layer of the eccentric part play an important role, it has been difficult to mechanize the assembly work of the eccentric shaft and piston. Invention d: To mechanize the assembly work of a shaft having an eccentric portion as shown above and an outer ring that is fitted and attached to the outer layer of the eccentric portion. The object of the present invention is to provide a method and apparatus that enable this.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 15.

Figure 1 shows that after the outer ring 2 is inserted into the fitting assembly jig 3, the eccentric shaft 1 is inserted into the fitting assembly jig 3, and the eccentric shaft 1 is eccentrically inserted in a manner that does not restrict the axial movement of the eccentric shaft 1. When the shaft 1 is rotated around the reference axis a, the central axis C of the outer ring 2
2 is a diagram illustrating an assembly method utilizing the fact that when the central axes of the eccentric portion of the eccentric shaft 1 coincide with each other, the eccentric shaft 1 falls onto the inner diameter portion of the outer ring 2 due to gravity. Figure 2 shows the eccentric shaft 10 reference axis a in the assembly method shown in Figure 1.
This is a diagram showing the relationship between the center axis of the eccentric shaft 1 and the center axis C of the outer ring 2. When the eccentric shaft rotates clockwise 00, the center axis of the eccentric shaft 1 and the center of the outer ring 2 are shown. This shows that the axes C coincide.

FIG. 3 shows that after the eccentric shaft 1 is set in the fitting assembly jig 4, the outer ring 2 is inserted into the fitting assembly jig 4, and the eccentric shaft 1 is rotated around the reference axis a. This shows an assembly method that utilizes the fact that when the center axis C of the eccentric part of the eccentric shaft 1 and the center axis C of the outer ring 2 coincide, the outer ring 2 falls onto the outer periphery of the eccentric part of the eccentric shaft 10 due to gravity. It is a diagram. Figure 4 is a diagram explaining the assembly method shown in Figure 3, which is similar to that explained in Figure 2.The two methods explained above each utilize the weight of the eccentric shaft 1 and the outer ring 2. The method of assembly is a spring or an air cylinder.

In the assembly method shown in Fig. 1 using a solenoid, etc., the eccentric shaft 1 is pushed downward, and in the assembly method shown in Fig. 3, the outer ring 2 is pushed downward, and then the eccentric shaft 2 is rotated. A method of fitting and assembling using a forcing force such as a cabrus is also effective.

Next, a specific example of an apparatus for assembling the eccentric shaft, piston, and soling of a rotary congressor using the assembly method described above will be described.

Figures 5 and 6 are an example of an assembly device that uses the assembly method shown in Figure 1, and includes an articulated robot 6 that freely operates the hand, an eccentric shaft 7 that grips the shaft 11, and an eccentric shaft. a robot hand 6 having a function of rotating the robot hand 11 in a manner that does not restrict the axial movement of the robot hand 6, a fitting assembly jig, and supply devices 8 and 9 for the eccentric shaft 11 and the piston 12;
After fitting and assembling the eccentric shaft 11 and piston 12,
Conveyance positioning device 1 for cylinder 13 that accommodates these
This is an assembly device consisting of 0 and 0, and the assembly work is performed according to the following procedure.

First, in FIG. 7, the robot hand 6 grabs the eccentric shaft 11 positioned in the shaft supply device 8,
Piston 12 is supplied in advance.

6. Insert the eccentric shaft 11 into the reference shaft guide hole of the fitting assembly jig 7 positioned at 6.gamma. as shown in FIG. Figure 9 shows the eccentric shaft 11, piston/12, and robot hand 9 at this time. indicates the relative position of

Then, at a position where the upper end surface of the piston 12 and the eccentric lower end surface of the eccentric shaft 11 contact, the robot hand 6 moves to the tenth position.
As shown in the figure, the robot hand 6 opens the eye 14.
is rotated by a robot hand rotation mechanism provided in the articulated robot 6, and the eccentric shaft 11 is rotated by the robot hand rotation mechanism provided in the articulated robot 6.
The eccentric part is pushed by the bottle 16 attached to the robot hand 6 and rotates in the clockwise direction, and the robot hand 6 moves to θ as shown in FIG.
When rotated, the center axis e of the eccentric portion of the eccentric shaft 11 and the center axis f of the piston 12 coincide with each other, and the eccentric shaft 11 falls onto the inner circumference of the piston 12 by gravity and is assembled and fitted. Then, the eccentric shaft 11 and the piston 12 that have been fitted and assembled as shown in FIG. 12 are chucked by the robot hand 6 and stored in the cylinder 13 as shown in FIG. is completed. In addition, normally, when assembling a compressor, a work style called matching is used to classify individual parts according to size and shape and assemble them into optimal combinations, but this assembly system uses an inspection device for individual parts. By supplying a sorting signal to the robot 6 from the robot 6, this matching assembly can be easily carried out.

Next, a specific example of a robot hand used in a specific example of the apparatus for assembling the eccentric shaft, piston, and seven rings of the compressor will be described.

In FIG. 14, 14 is a pawl for gripping the eccentric shaft, 16 is an auxiliary pawl for gripping the piston, and 18 is a pawl 14 for gripping the piston.
and a cylinder that drives the auxiliary pawl 16 to open and close. 1
5 is a bottle for pushing the eccentric part of the eccentric shaft 11 to rotate the eccentric shaft 11 when the robot hand 6 is rotated by the rotary drive device of the multi-articulated robot 6;
0 is the central axis of the eccentric part of the eccentric shaft 11 and the piston 12
When the eccentric shaft 11 falls onto the inner periphery of the piston 12 due to gravity and is assembled together, the spring is used to assist the assembly through the pusher 17. be.

As described above, according to the present invention, the assembly work that conventionally had to be done manually because it was difficult to center the eccentric parts can be easily performed by a machine, resulting in a large labor-saving effect.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of an eccentric shaft for explaining the assembly method of the present invention, FIG. 2 is a plan view of the same, and FIG. 3 is a cross-section of an eccentric shaft for explaining another assembly method according to the present invention. figure,
FIG. 4 is a plan view of the same, FIG. 6 is a plan view of an assembly device according to an embodiment of the present invention, and FIGS. 12 and 13 are partial cross-sectional side views of the main parts of the robot hand, 1... Eccentric shaft, 2... Outer ring, 3
...Fitting assembly jig, 4...Fitting assembly jig, 6...Multi-joint robot, 6...Robot hand, 7... ...Fitting assembly jig, 11...
... Eccentric shaft, 12 ... Piston, 1
3... Cylinder, 14... Pawl, 1
Gi・kawa・pin, 16・・auxiliary nail, 17・song・
Punya, 18... Pawl drive piston, 19
・4・Hand body, 2゜ Spring. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Fig. 2 Fig. 3 Fig. 4 @ 6 Fig. 7 Fig. 8 Fig. 9 Garden Fig. 10 Fig. □ Fig. 12

Claims (3)

[Claims] (1) The central axis of the outer ring is rotated around the reference axis of the eccentric shaft, and the central axis of the outer ring is previously positioned and held at an arbitrary position separated from the reference axis by the same distance as the eccentricity of the shaft; A method of assembling a shaft having an eccentric part, in which the center axis of the shaft eccentric part is aligned with the center axis of the shaft eccentric part, and the outer ring and the eccentric shaft are fitted and assembled using gravity, a spring, an air cylinder, a solenoid, etc. (2) A machine capable of freely operating the hand and rotating the hand around the central axis of the hand. a handle Y' equipped with a handle for gripping the reference axis of the eccentric shaft and a drive mechanism for opening and closing the claw; The eccentric part is composed of a fitting assembly jig provided with an outer ring holding hole whose center axis is located at a distance equal to the eccentricity of the eccentric shaft, and a device for supplying and positioning the eccentric shaft and the outer ring. Shaft assembly equipment with. (3) The above-mentioned node includes a pawl that grips the shaft, an auxiliary pawl that presses the fitting assembly jig ring to hold the outer ring, and a drive device that opens and closes the pawl and the auxiliary pawl;
It is composed of a pin that can slide in the axial direction, grips the eccentric shaft and the outer ring at the same time, and uses the eccentric part of the eccentric shaft to prevent the falling movement of the eccentric shaft in the axial direction due to gravity. A shaft assembly apparatus having an eccentric portion according to claim 2, which is configured to rotate the eccentric shaft.