JPS62152629A - Piston pin inserting device - Google Patents

Abstract

PURPOSE:To make it possible to automate the assembly of a piston and a connecting rod to aim at enhancing the productivity, by fitting a guide pin into a piston pin hole and a hole in a small end part of a connecting rod to locate it, and thereafter by press-fitting a piston pin into a piston simultaneously with extraction of the piston pin. CONSTITUTION:A piston 1 and a connecting rod in combination are heated and conveyed on a conveyer 9, and a guide pin inserting robot 6 locates them while a cylinder for the Y-axis 6c inserts a guide pin 8 into an insertion hole 1a so that it pierces through the small end part of the connecting rod so that the piston 1 and the connecting rod are temporarily fixed together. Then, the piston pin inserting robot 7 pushes out a push-out bar so that the piston pin at the lowermost piston pin in a cartridge 12 is dropped into a through-hole in a receiving member from its receiving port. Further, a cylinder 15b inserts the push-out bar into the piercing hole 14b, and the piston pin is pushed into the piston pin insertion hole 1a, being guided by the hole 14d, and simultaneous ly, the guide pin 8 is extracted. Thereby the piston pin is automatically press-fit in the piston 1 after piercing it through the small end of the connecting rod.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a piston pin insertion device in a piston assembly for an engine such as an automobile.

[Conventional technology and its problems]

As is well known, the piston has a connecting rod 2 inside the piston 1.
The small end 2a of the piston is inserted, and both chambers are connected with a piston pin 3 (see Fig. 8).

Piston pin retaining rings 4 are set at both ends of the inserted piston pin 3 within the piston pin insertion hole la to prevent the pin 3 from being pulled out.

In the figure, 5 indicates a piston ring such as an oil ring or a compression ring.

As described above, the work of inserting the piston pin 3 through the insertion hole 1a of the piston 1 and passing it through the small end 2a of the connecting rod 2 has conventionally been done entirely by hand.

This is done by heating the piston 1 in advance and slightly enlarging the insertion hole la, but the dimensions are perfect and require considerable skill. Furthermore, since the work was done manually, the work efficiency was poor.

SUMMARY OF THE INVENTION An object of the present invention is to provide a piston pin insertion device that eliminates the disadvantages of the conventional example and can improve productivity through automation.

[Means for solving problems]

In order to achieve the above object, the present invention provides an orthogonal coordinate system robot in which a piston and a connecting rod having a small end inserted into the piston are provided with a guide pin that can be freely inserted into a pin insertion hole of the piston, and a piston. A cartridge located on the opposite side of the guide pin and housing a large number of piston pins, a pin extrusion means from the lower end of the cartridge, a receiving member for the extruded pins, and a pin inserting into the piston from behind the receiving member. It consists of a combination with an orthogonal coordinate system robot equipped with an extrusion means, and the guide pin is first inserted into the pin insertion hole of the piston and the small end hole of the connecting rod to position it, and then, as the guide pin is extracted, the pin is inserted into the piston. The purpose is to push inside.

[Effect]

According to the present invention, positioning is performed by first inserting a guide pin into the piston and the small end of the connecting rod inside the piston. On the other hand, a large number of piston pins are housed in the cartridge, and the lowest piston pin is led out to the receiving member by the pin insertion means.

Next, the guide pin is pulled out from the piston, and the piston pin is pushed out from the receiver member by the pushing means and pushed into the piston so that the axes of the guide pins coincide with each other.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a side view showing one embodiment of the piston pin insertion device of the present invention, FIG. 2 is a plan view of the same, and FIG. 3 is a front view of a robot that inserts a piston pin. It consists of a combination of two robots: an insertion robot 6 and a piston pin insertion robot 7.

Of these, the guide pin insertion robot 6 will be explained first. It is a robot with an orthogonal coordinate system in which an X-axis 6b is provided above the upper and lower cylinders forming the Z-axis 6a, and a cylinder forming the Y-axis 6c is further provided above it. One or more guide pins 8 with sharp tips are attached to the cylinder rod end of the shaft 6C.

Reference numeral 9 in the figure denotes a conveyor constituting an assembly line, on which the piston 1 is temporarily fixed so as to cover the upright connecting rod 2 and transported by a pallet 10 as shown in FIG. The guide pin insertion robot 6 is placed on one side of the conveyor 9, and the piston pin insertion robot 7 is placed on the opposite side.

This piston pin insertion robot 7 is an orthogonal coordinate system robot in which an X-axis 7b is provided on a table constituting a Z-axis 7a, a Y-axis 7c is further provided on the table, and a table 11 is attached above the X-axis 7b.

The robot 7 is provided with a cartridge 12 that stores a large number of piston pins in the vertical direction, and a cylinder 13 is installed behind the lower end of the cartridge 12.
A pin extrusion means 13 consisting of a pin extrusion bar 13b abutted against the rod and inserted into the cartridge 12 is attached. In the figure, 13C is a spring that causes the extrusion bar 13b to retreat along the guide bar 13d.

In front of the lower end of the cartridge 12 is a receiving member 14 for a piston pin pushed out corresponding to the pin pushing means 13.
The receiving member 14 has a horizontal through hole 14 whose upper surface is open in an oblong body 14a whose vertical length is at least the same as that of the cartridge 12, that is, about the length of a piston or pin.
b, and when multiple types of cartridges 12 are arranged in parallel depending on the type of piston pin, the upper surface socket 14C of the through hole 14b is provided so that it can be common to several of the cartridges 12 depending on the type of piston pin. 2 (it is formed wide enough to span the lower end of the cartridge 12 on the recovery side).Several through holes L4b of different sizes are provided in the oblong body 14a.

In addition, a horizontally long guide member 1 is provided with several types of through holes 14d in accordance with the types of piston pins in the front of the horizontally long body 14a.
4e is provided so as to be movable in the lateral direction by a cylinder 14f.

At the rear of such a receiving member 14, an extrusion means 15 consisting of a cylinder 15b having an extrusion bar 15a fixed to the rod end, which is pushed into the through holes 14b and 1.4d of the receiving member 14 from the rear, is provided. .

Next, usage and operation will be explained.

A large number of piston pins 2 are stored in a cartridge 12 of a piston pin insertion robot 7, separated by size. On the other hand, as mentioned earlier, the combination of the piston 1 and the connecting rod 2 temporarily placed on the conveyor 9 by the bullet 10 is conveyed while passing between heaters (not shown) and heated appropriately. It's coming. In that case, the piston pin insertion hole 1a of the piston 1 is oriented perpendicularly to the traveling direction of the conveyor 9, that is, toward the robot 6.7.

In this way, first, the guide pin insertion robot 6 operates to appropriately position the guide pin 8, and then the guide pin 8 is pushed out by the cylinder of the Y-axis 6C and inserted into the insertion hole 1a to receive the small end 2a of the connecting rod 2. Pass. Now screw 1
- The combination of the connector l and the connecting rod 2 is temporarily fixed.

Next, the pin pushing means 1 of the piston pin insertion robot 7
The cylinder 13a of the cartridge 12 is actuated to extend its rod, and the push-out bar 13b is pushed out against the spring 13c, and the piston pin 3 at the lowest end of the cartridge 12 is pushed out and the receiving member 14 is pushed out from the socket 14C. through hole 14
b and is located at its arcuate bottom. Note that after that, the rod of the cylinder 13a contracts, and the push-out bar 13b also returns to its original position due to the elasticity of the spring 13c.

On the other hand, the guide member 14e is laterally moved by the cylinder 14f so that the through hole 14d corresponding to the thickness of the piston pin 2 matches the front end of the through hole 14b. Then, the extrusion bar 15a is pushed into the through hole 1 by the cylinder 15b.
4b, and the piston pin 3 in the hole 14b is pushed into the piston pin insertion hole 1a of the piston 1 using the through hole 14d as a guide.

At the same time, the guide pin 8 is pulled out from the piston 1, and the piston pin 3 passes through the small end 2a of the connecting rod 2 and is completely housed in the piston 1.

Once the piston pin 3 is set as described above, the rod of the cylinder 15b is contracted and the push bar 15a returns to its original position.

〔Effect of the invention〕

As described above, the piston pin insertion device of the present invention has the following features:
The insertion of piston pins in piston assembly, which was conventionally done manually, can be fully automated, thereby eliminating the need for skilled workers and greatly improving productivity.

[Brief explanation of drawings]

FIG. 1 is a side view showing one embodiment of the piston pin insertion device of the present invention, FIG. 2 is a plan view of the same, FIG. 3 is a front view of the piston pin insertion robot, and FIG. An explanatory diagram showing the state of the piston before such a state, FIG. 5 is a vertical cross-sectional side view of the main parts of the piston pin insertion robot, FIG. 6 is a front view of the same as above, FIG. 7 is a plan view of the same as above, and FIG. 8 is an assembly of the piston. FIG. 1... Piston 1a... Piston pin insertion hole 2... Connecting rod 2a... Small end 3... Piston pin 4... Piston pin retaining ring 5... Piston ring 6... Guide Pin insertion robot 6a...Z axis 6b...X axis 6c...Y
Axis 7... Piston pin insertion robot 7a... Z axis 7b... X axis 7C... Y axis 8... Guide pin 9... Conveyor
10...Pallet 11...Table 12
...Cartridge 13...Pin extrusion means 13a
...Cylinder 13b...Extrusion part'-t3c...Spring 13d...Guide bar 14...Receiving member 14a...Elongated body 14b...Through hole 14C
...Socket 14d...M through hole 14e...
Guide member 14f...Cylinder 15...Extrusion means! 5a
...tllll exit bar 15b...cylinder 3rd
Diagram 4

Claims (2)

[Claims] (1) An orthogonal coordinate system robot equipped with a guide pin that can be freely inserted into the piston's pin insertion hole for the piston and the connecting rod with the small end inserted into the connecting rod, and the opposite side of this guide pin with the piston in between. A rectangular coordinate system comprising a cartridge located on the side and containing a large number of piston pins, a pin extrusion means from the lower end of the cartridge, a receiving member for the extruded pins, and an extruding means for inserting the pins into the piston from behind the receiving member. It consists of a combination with a system robot, and is characterized by first inserting and positioning the guide pin into the pin insertion hole of the piston and the small end hole of the connecting rod, and then pushing the pin into the piston as the guide pin is removed. Piston pin insertion device. (2) Insertion of the piston pin according to claim 1, wherein the pin receiving member has a wide socket that spans several types of cartridge ends, and a guide member that can be switched forward is provided. Device.