JP2569910Y2 - Piston ring mounting device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piston ring mounting device for mounting a piston ring on a piston of an internal combustion engine.

[0002]

2. Description of the Related Art Hitherto, in order to mount a piston ring on a piston, an operator has used a pliers to extend one or one piston ring and mount the piston ring in a groove of the piston.

[0003]

However, the piston has two or three piston rings, each of which has a role, so that mounting errors sometimes occur. In addition, the number of attachments to the piston was very heavy.

The present invention has been made in view of the above-mentioned circumstances. Instead of directly attaching a piston ring by hand, a large number of piston rings are externally attached and a piston is attached to an upper end of a stock ram, and the piston is raised by pressure and pneumatic movement. After that, the ram is dropped by its own weight to provide a piston ring device for mounting the piston ring on the piston.

[0005]

According to the present invention, in order to achieve the above object, a ram head having a tapered outer lower portion of a cylindrical portion into which a piston is inserted from above is provided on the inner diameter side.
A ram detachably attached to the upper end of the cylindrical piston,
A cylinder into which the ram is slidably inserted, and an air circuit that is dropped by its own weight after the ram is raised, and the piston ring that is inserted into the ram is moved by the fall of its own weight after the ram is raised. It is characterized by fitting into

In the air circuit, a shuttle valve for operating an air operated switching valve connected to the cylinder via a speed controller from a compressed air source passes through a first manual switching valve and is connected to a relay valve via a time delay valve. And connected to a shuttle valve that operates the air-operated switching valve from an air source via a second manual switching valve,
The cylinder is connected to a silencer having a predetermined air resistance. Further, the invention is characterized in that the cylinder and the air circuit in which the ram is slidably fitted are provided in the same number as the number of piston rings to be mounted.

[0007]

The tapered portion of the ram head is connected to the upper end of the cylindrical piston, and the piston ring extrapolated to the cylindrical piston is expanded by the tapered portion of the ram head.
It is mounted on the piston ring groove of the piston via the cylindrical part.

When the first manual switching valve is pressed, the compressed air passes through the time delay valve, moves the shuttle valve via the relay valve, and switches the air-operated switching valve connected thereto for a predetermined short time. Then, after raising the ram, drop the ram by its own weight.

Further, when the second manual switching valve is pushed, the ram rises, so that the ram head can be removed, and the piston ring can be externally inserted into the ram to replenish the stocked piston ring.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a front view showing one embodiment of the present invention, FIG. 2 is a side view showing one embodiment of the present invention, and FIG. 3 is an air circuit diagram showing one embodiment of the present invention.

1 and 2, reference numeral 10 denotes a ram, which comprises a cylindrical piston 12 and a ram head 11. The ram head 11 has a cylindrical portion 11a into which the piston 30 is fitted from above, and a lower portion formed into a taper 11b. The ram head 11 is screwed to the upper end of the cylindrical piston 12.

Reference numeral 20 denotes a cylinder in which the cylindrical piston 12 of the ram 10 is slidably fitted, L is a stroke, and the upper end 21 of the cylinder 20 and the upper end 11 of the ram head 11
The piston ring is extrapolated between the piston ring and the ring d.

Reference numeral 22 denotes a stopper.
1, the protruding positions of the rams 10, 10 fitted into the left and right cylinders 20, 20 are defined as shown in FIG. 1. The ram 10 can be freely lowered from the position, and the ram 10 is moved by a piston ring (not shown).
Is mounted on the piston 30 and descends.

An operation console 41 is provided with an operation button (not shown) of the first manual switching valve 50 and an operation button (not shown) of the second manual switching valve 60 for each cylinder 20. (FIGS. 1, 2, and 3).

Reference numeral 42 denotes a storage case for the air circuit. Valves and piping are provided below the storage case 42 and the mount 40.

Next, the operation of the apparatus of the present invention will be described with reference to FIG. In this embodiment, since the piston has three piston ring grooves, three cylinders and three air circuits are shown for each cylinder.
The case of a pair will be described. In the figure, reference numeral 80 denotes a pressure source, and 81 denotes a block manifold from which pressure is supplied to each circuit.

Reference numeral 70 denotes an air-operated switching valve, which is supplied with compressed air through an air regulator 71 and a speed controller 72, and is operated by a shuttle valve 73. The outlet port of the air-operated switching valve 70 is connected to the cylinder 20, and a silencer 74 is connected to the cylinder 20, and the compressed air supplied through the air-operated switching valve 70 is compressed by the silencer 74 to an appropriate back pressure. It is constructed so that the ram 10 does not rise suddenly.

The operation of the shuttle valve 73 is performed by the first manual switching valve 50 or the second manual switching valve 60. When the first manual switching valve 50 is pressed, air is supplied to the time delay valve 51, the shuttle valve 73 is operated via the relay valve 52, and the air-operated switching valve 70 is operated so that the air is supplied to the cylinder 20 for a predetermined short time. After being supplied only, the air operated switching valve 70 returns, and the air in the cylinder 20 is released to the atmosphere. The time delay valve 51 performs this function. Therefore, the ram 10 instantaneously rises and then descends by its own weight, so that the piston ring at the upper end of the ram head 11 is mounted in the piston ring groove 31 of the piston 30.

Assuming that a piston ring is externally inserted into the right and center rams 10 and an oil ring is externally inserted into the left ram shown in FIG.
The piston ring is attached to the groove at the lower end of the piston 30 in the figure by pressing the push button of the first manual switching valve 50 at the right end, then the piston 30 is removed, and the piston ring is attached to the center ram head 11. When the central position is pressed, the piston ring passes through the outer periphery of the piston ring attached to the lower end and is attached to the second groove. Next, the piston 30 is removed, and the piston 30 is inserted into the leftmost ram head 11.
, And push the push button at the left end position, the oil ring passes through the outer circumference of the already installed two piston rings,
It is attached to the third row from the bottom.

When the ram 10 is at the position shown in the center of FIG. 1, in order to replenish the piston ring to the outer periphery of the ram, when the push button of the second manual switching valve 60 is pressed, the second manual switching valve 60 in FIG. Is supplied to the shuttle valve 73, and supplied to the cylinder 20 through the air-operated switching valve 70, so that the ram 10 rises to the upper end (the right and left ram positions in the figure) and is held by the stopper 22. Since it stops, the ram head 11 is removed, the piston ring is assembled from the upper end of the cylindrical piston 12, and the ram head 11 is attached.

[0021]

According to the present invention described in detail above, the following effects can be obtained. (1) The operator mounts the piston on the upper end of the ram head and presses the push button to mount the piston ring on the piston, so that the efficiency of the piston ring mounting operation is improved and the workload is reduced.

(2) By providing the same number of cylinders and air circuits as the number of piston ring grooves of the piston, mounting of the piston ring does not occur incorrectly.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a side view showing an embodiment of the present invention.

FIG. 3 is an air circuit diagram showing an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Ram 11 Ram head 11a Cylindrical part 11b Taper 11c Inner diameter 11d Upper end 12 Cylindrical piston 20 Cylinder 21 Upper end 22 Stopper 30 Piston 31 Piston ring groove 40 Mounting base 41 Operating table 42 Storage case 50 First manual switching valve 51 Time delay valve 52 Relay Valve 60 Second manual switching valve 70 Air operated switching valve 71 Air regulator 72 Speed controller 73 Shuttle valve 74 Silencer 80 Compressed air source 81 Block manifold

Claims (3)

(57) [Scope of request for utility model registration] A ram head having a tapered outer lower portion of a cylindrical portion into which a piston is fitted from above on an inner diameter side, and a ram detachably mounted on an upper end of the cylindrical piston, and the ram is slidably fitted. Equipped with an inserted cylinder and an air circuit that is dropped by its own weight after raising the ram,
A piston ring mounting device, wherein a piston ring inserted into a ram is moved by a self-weight fall after the ram is lifted, and the piston ring is fitted into a piston. 2. The air circuit includes a shuttle valve for operating an air-operated switching valve connected to the cylinder via a speed controller from a compressed air source via a speed controller, and a shuttle valve passing through a first manual switching valve and passing through a time delay valve. And a cylinder connected to a silencer having a predetermined air resistance, wherein the cylinder is connected to a shuttle valve for operating the air-operated switching valve from an air source via a second manual switching valve. Item 2. A piston ring mounting device according to Item 1. 3. The piston ring according to claim 1, wherein the cylinder and the air circuit on which the ram is slidably fitted are provided by the same number as the number of piston rings to be mounted. Mounting device.