JPH0214906Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a piston assembly insertion device used to insert a piston assembly into a cylinder block of an engine.

(Prior Art) This type of device that has been used in the past consists of a hand-held tool 37 made of a leaf spring and a simple bar-shaped press-fitting tool 36, as schematically shown in FIG. Piston assembly 17 into bore 33 of cylinder block 32
When inserting, up to the oil ring 34 can be easily inserted. The oil ring 34, the second ring 38, and the top ring 39 are held from the oil ring 34 using a special hand holding tool 37, and after each ring is contracted, the head of the piston assembly 17 is removed using the press-fitting tool 36. Insertion of the piston assembly 17 is performed by pressing the part in the direction of the arrow.

(Problem to be solved by the invention) In order to reduce the top ring, second ring, and oil ring using the conventional tool described above, it is necessary to use strong fingertip muscle force (converted into thrust by the pneumatic cylinder). 25 kg/cm ² or more), and the current situation is that continuous work causes overwork of the fingertips and reduces work efficiency. moreover,
This work requires considerable skill and relies on intuition, making it difficult to standardize the work.

Therefore, the present invention solves the above problems by providing a piston assembly inserter that can easily insert the piston assembly into the cylinder block by using a driving means in place of human grip force. The purpose is to provide equipment.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides an apparatus for inserting a piston assembly into a cylinder block of an engine while tightening a piston ring.
A rod-shaped mounting plate, a cylinder attached to the upper end of the mounting plate, a holding member screwed and connected to the tip of the piston rod of the cylinder, and a holding member swingably attached to the tip of the holding member. a swinging member;
A rotating member facing the swinging member and rotatably pivoted to the lower end of the mounting plate; one end fixed to the swinging member and the other end fixed to the rotating member to form an annular shape. and a tightening band that expands and contracts in diameter following the operation of the cylinder to tighten and release the piston ring.

(Operation) With the above structure, when inserting the piston assembly into the cylinder block, first insert the piston assembly by hand until the oil ring contacts the bore of the cylinder block. Next, the tightening band is placed around the oil ring, the second ring, and the top ring, and when the cylinder is actuated to advance the holding member, the swinging member comes into contact with the rotating member. At this time, the tightening band compresses each ring, and while maintaining this state, when the head of the piston assembly is pressed using a press-fitting tool, the piston assembly is
It slides on the inner peripheral surface of the tightening band and enters the bore. Therefore, during this tightening, the tightening band always maintains a circular state due to the rocking or rotation of the swinging member and the rotating member, and an even tightening force is applied to the piston ring in the circumferential direction. Therefore, the tightening becomes reliable. Moreover, since the holding member is screwed and connected to the piston rod, the expansion diameter of the tightening plate can be changed as desired by extending or shortening the holding member, and it can also be used to tighten piston rings of different diameters. .

(Example) An example of the present invention will be described below based on the drawings. First, FIG. 1 shows the entire piston assembly insertion device 1, and as shown in FIG. By attaching 4, it is suspended from above in a shape that makes it easy to work. A tube 5 from an air source is connected to the upper end of the pneumatic cylinder 3 by a connecting nut 6 for supplying compressed air. A mounting hole is opened in the upper end 7 of the mounting plate 2, and the upper end 7 is tightened with nuts 8 and 9. A screw is formed at the end of the piston rod 10 that extends downwardly and retractably from the pneumatic cylinder 3, and a nut 11 is screwed into the end, and is further screwed into a presser member 12 having a screw. It is now possible to adjust the expansion and contraction. A hemispherical curved convex contact surface 1 is provided at the tip of the presser member 12.
3 is formed. Correspondingly, the convex abutment surface 13 of the holding member 12 is shallower than the hemisphere of the convex abutment surface 13, and has a concave abutment surface 14 formed with approximately the same curvature as the swinging member 15. is in contact with. An annular collar 16 is fixed to the concave contact surface 14 formed on the swinging member 15 by a method such as welding so as to surround the concave contact surface 14, and the swinging member 1, which will be described later,
5, the convex abutting surface 13 and the concave abutting surface 14 slide and do not come out of contact. On the back side of the swinging member 15 with respect to the concave abutment surface 14, one end portion 20 of the tightening band 19 is located which reduces the piston ring 18 of the piston assembly 17 (FIGS. 5 and 6), and the clamping plate 21 and are screwed through each mounting hole. The tightening band 19 has a shape corresponding to the outer diameter of the piston ring 18 of the piston assembly 17, and is positioned so as to protrude laterally with respect to the direction of movement of the presser member 12 described above. The other end 22 of the tightening band 19 is connected to the lower end 23 of the mounting plate 2.
It is held between a rotating member 25 rotatably supported by a pin 24 and a clamping plate 26, and is screwed through each mounting hole. Since both ends of the tightening band 19 are attached against the elastic force of the tightening band 19, the concave contact surface 14 of the swinging member 15 presses against the convex contact surface 13 of the holding member 12. It is in the form of In this way, as shown in FIGS. 3 and 4, the tightening band 19 is
opens and closes, and the swinging member 15 becomes swingable along the curved surface of the convex contact surface 13 of the holding member 12, and at the same time, the swinging member 25 rotates around the pin 24. Further, as shown in FIGS. 3 and 4, another mounting plate 27 is provided laterally projecting from the lower end portion 23 of the mounting plate 2, and a box body 28 is attached thereto. A well-known pneumatic changeover switch 29 is attached to this box body 28 in order to operate the pneumatic cylinder 3, and from there a control air tube 5 is attached by a connecting nut 6 and extends upward, not shown. connected to the air valve. A handle 30 is attached to the box body 28 for convenient handling of the device.

In this embodiment, the convex abutting surface 13 and the concave abutting surface 14 are formed into spherical shapes, but the present invention is not limited to this. A curved surface having a predetermined curvature is provided on the
On the other hand, a groove having a curved surface may be formed at the bottom so that the grooves can come into contact with this curved surface, and the grooves may contact each other. Alternatively, the tip of the holding member 12 and the curved surface of the swinging member 15 that abuts thereon may be rotatably supported. In addition to pneumatic pressure, hydraulic pressure can also be used. With this configuration, when using the piston assembly insertion device 1, first insert the piston assembly 17 from its connecting rod 31 side into the bore 33 of the cylinder block 32, as shown in FIG. 34 comes into contact with the cylinder block 32,
The tightening band 19 of the piston assembly insertion device 1 is placed against the surface 35 of the cylinder block 32 while surrounding the piston ring 18. When the pneumatic changeover switch 29 shown in FIG. 1 is pressed with a finger, the pneumatic cylinder 3 is activated and the presser member 12 connected to the piston rod 10 moves downward, as shown in FIGS. 4 to 3. The tightening band 19 is closed from the open state. Then, as shown in FIG. 6, the tightening band 19 compresses the piston ring 18, and while maintaining this state, when the press-fitting tool 36 presses the head of the piston assembly 17, the position shown by the dotted line is reached. The piston assembly 17 can be easily inserted. To open the tightening band 19, just release the finger pressing the air pressure changeover switch 29.

(Effects of the invention) From the above, the present invention simplifies the insertion process by using an insertion device that uses a cylinder to reduce the piston ring when inserting the piston assembly into the bore of the cylinder block. This reduces the burden on the operator and standardizes the work since no skill or intuition is required for insertion. Furthermore, since the tightening band can be used as is with a conventional hand-picking tool, it is effective in manufacturing this device, and versatility is increased by replacing other types of tightening bands. In addition, since the tightening band can always maintain a circular state, the piston ring can be tightened reliably, increasing the reliability of the device.Furthermore, since the expansion diameter of the tightening plate can be changed arbitrarily, piston rings of different diameters can be It can also be used for tightening, improving versatility.
Overall, the effects are great.

[Brief explanation of the drawing]

FIG. 1 is an overall view showing the piston assembly insertion device of the present invention, FIG. 2 is a side view shown by arrow A-A in FIG. 3 with the tightening band closed, and FIG. FIG. 4 is a front view showing the tightening band in a closed state; FIG. 5 is a schematic vertical sectional view showing the piston ring surrounded by the tightening band; FIG. 6 is a schematic vertical cross-sectional view showing a state in which the piston ring is contracted by a tightening band, and FIG. 7 is a perspective view showing a state in which a conventional piston assembly is inserted. 1: Piston assembly insertion device, 2: Mounting plate,
3: Drive means (pneumatic cylinder), 7: Upper end,
12: Holding member, 13: Convex contact surface, 14: Concave contact surface, 15: Swing member, 17: Piston assembly, 18: Piston ring, 19: Tightening band, 2
3: Lower end, 25: Rotating member, 32: Cylinder block.

Claims (1)

[Scope of utility model registration request] A device for inserting a piston assembly into an engine's cylinder block while tightening a piston ring, in which a rod-shaped mounting plate, a cylinder attached to the upper end of the mounting plate, and a piston rod tip of the cylinder are screwed and connected. a holding member, a swinging member swingably attached to the tip of the holding member, and a pivoting member rotatably pivoted to the lower end of the mounting plate opposite to the swinging member. The member has an annular shape with one end fixed to the swinging member and the other end fixed to the rotating member, and expands and contracts in accordance with the operation of the cylinder to tighten and release the piston ring. A piston assembly insertion device comprising: a tightening band;