JPS59115129A - Assembly of piston - Google Patents

Abstract

PURPOSE:To permit the pushing work for a piston into a cylinder in continuation by using a holding fin in the piston assembly work in which the piston of an internal-combustion engine is inserted into the cylinder and assembled. CONSTITUTION:After the holding of a piston 6 is released, the holding tool 2 is moved upward a little to form a closed state, and then the holding tool 2 is moved downward and attached onto the top surface of the piston 6 at the contact part 3a at the lower edge of each holding piece 3, and said piston 6 is pushed-into a cylinder 8 against the springy force of a piston ring 6a. Thus, the insertion work for the piston 6 into a guide ring 8 and the pushing-in work into the cylinder 7 can be carried-out efficiently in the same process continuously by using the holding tool 2 in common, and the line base and equipment cost can be reduced, and productivity can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention mainly relates to a piston assembly method for inserting and assembling a piston of an internal combustion engine into a cylinder.

Conventionally, as this type of assembly method, a piston with accessories such as piston rings and connecting rods assembled in advance is gripped by a gripper that can be opened and closed attached to a movable member such as a robot arm, and the piston is placed on a cylinder with a taper. It is known that the piston is inserted into a guide ring, then the gripping tool releases the piston, and the piston is pushed through the guide ring into the cylinder - this pushing operation transports the cylinder to the next process. This is generally carried out using a dedicated pressing member.1 This has the disadvantage of increasing the number of processes and increasing line space and equipment costs. In order to solve this problem, the present invention provides a gripping finger. The purpose of this is to provide an assembly method that allows the piston to be continuously pushed into the cylinder using a piston that has been fitted with accessories such as piston rings and connecting rods in advance. is gripped by a gripper that can be opened and closed attached to a movable member such as an o-bot arm, and inserted into a tapered guide ring placed on the cylinder, and then the piston is released from gripping by the gripper. In a method of assembling a piston in which the piston is pushed into the cylinder through the guide ring, the gripper is closed so that its outer periphery has a smaller diameter than the cylinder diameter, and the hind limb is released from gripping the piston. The present invention is characterized in that the gripping tool is brought into contact with the top surface of the piston in the closed state, and the piston is pushed into the cylinder by the gripping tool.

Next, the present invention will be explained with reference to the illustrated embodiments.

In the drawings, (1) indicates a movable member such as a robot arm, (2J indicates a gripping tool provided at the tip of the robot arm, etc.), (1) the gripping tool (2) connects a pair of gripping pieces (3), and (3) with parallel links (4). ) (4), the movable member (11) is attached to the movable member (11) so as to be able to move in parallel to each other on the laterally outward open side and the inner closed side. Piston prepared for (1) (
Connect the piston lid (5a) of 5) and move each gripping piece (3) between the opening side and the closing side as the piston 4 (5a) advances and retreats to open and close the gripping tool (2J). Place the piston ring (6a) on the gripper (2) in advance.
The piston (6) is moved by the operation of the movable member (1).
) is transferred onto a predetermined assembly station where the cylinder (7) is set.

Here, the gripping tool (2) has an outer periphery that corresponds to the cylinder (7).
The gripping pieces (3) each have an abutting portion (3a) formed at the lower end thereof to abut against the top surface of the piston (6).

In the drawing, (8) shows a tapered guide ring arranged on and concentrically with the cylinder (7) for centering and inserting the piston (6) into the cylinder (7).

Next, to explain the work procedure according to the present invention, first, the piston (6) with the piston ring (6a) and connecting rod (6b) assembled thereon is gripped by the gripper (2) as described above and transferred onto the assembly station. Then, the movable member (11) moves the gripping tool (2) downward as shown in FIG. 1 to insert the piston (6) into the guide ring (8), and the gripping tool (2) At a predetermined downward movement position where it comes into contact with the guide ring (8), open the gripper (2) as shown in the second figure to release the grip on the piston (6).At this time, the piston (6) The ring (6a) contacts the tapered surface of the guide ring (8) and does not fall below a certain position.

Although the above is not particularly different from the conventional one described above, according to the present invention, the hind limb gripper (
2) up a little to close it, then open the gripper (
2) downward to touch the bottom part (3a) of each gripping piece (3).
Then, the piston (6) is brought into contact with the top surface of the piston (6), and the piston (6) is pushed into the cylinder (7) against the elasticity of the piston ring (6a) as shown in FIG.

This pushing operation involves keeping the gripping tool (2) in the open state and shifting the gripping tool (2) so that one of the gripping pieces (3) is positioned on the guide ring (8), and then It is also possible to do this by bringing the gripping piece (3) into contact with the piston (6) by downward movement, but in this case, control is required to move the movable member (1) laterally and position it at a predetermined position. Tonashi,
Compared to the present invention, in which it is sufficient to move the movable member (1) up and down at a fixed position during the pushing operation, the efficiency of the operation is lower.

As described above, according to the present invention, the work of inserting the piston into the guide ring and the work of pushing it into the cylinder can be performed continuously and efficiently in the same process using one common gripping tool, which saves line space and equipment. This has the effect of reducing costs and increasing productivity.

[Brief explanation of the drawing]

FIG. 1 is a cut side view of one example of the gripping tool used in the present invention.
2 and 6 are cut side views illustrating the working procedure of the method of the present invention. (1)...Movable member (2)...Gripper (6
)... Piston (6 ties... Piston ring (6b)... Connecting rod (7)... Cylinder (8)... 2 people outside the guide ring

Claims (1)

[Claims] A piston with accessories such as piston rings and connecting rods assembled in advance is held by a gripper that can be opened and closed attached to a movable member such as a four-bot arm, and inserted into a tapered guide ring placed on the cylinder. In the piston assembly method in which the piston is released from the grip by the grip and the piston is pushed into the cylinder through the guide ring, the outer periphery of the grip is smaller in diameter than the cylinder diameter when the grip is closed. The piston is characterized in that the hind limb gripper released from gripping the piston is brought into contact with the top surface of the piston in the closed state, and the piston is pushed into the cylinder by the gripper. How to assemble.