JPS621207B2 - - Google Patents

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a device for measuring the pressure in the vertical direction of the piston ring groove of a piston ring installed in the piston ring groove provided on the outer peripheral surface of a piston for an internal combustion engine. This is related.

[Prior Art] Piston rings are generally classified into compression rings and oil rings.

In an internal combustion engine, the oil ring scrapes off excess lubricating oil adhering to the inner wall surface of the cylinder and returns it to the oil pan, and at the same time prevents the lubricating oil from entering the combustion chamber. For this reason, the oil ring has
Many are used that have a pressing force against the inner wall surface of the cylinder and a pressing force against the inner surface of the piston in the axial direction in the piston ring groove.

In modern internal combustion engines, combination oil rings for controlling lubricant consumption, e.g.
It has a structure in which the expander is sandwiched between the upper side rail and the lower side rail. The frictional force between the ring groove and the upper and lower surfaces, and thus the amount of lubricating oil consumed, is affected, but no device for measuring the pressure in the upper and lower surface directions has been found that has a simple structure.

[Problems to be Solved by the Invention] An object of the present invention is to provide a device that can easily measure the pressure in the vertical direction in the piston ring groove due to the pressing force of the piston ring with a simple structure. .

[Means for Solving the Problems] In order to achieve the above object, the present invention is characterized in that a piston ring groove in which a piston ring to be measured is mounted is formed on the outer periphery of the piston, and a piston ring groove is formed on the upper surface of the piston ring groove. A piston consisting of an upper piston and a lower piston that are divided into upper and lower parts, a fixed cylinder arranged on the outer periphery of the piston so as to fit the piston, and a piston ring groove axial width that allows the upper piston to move up and down. an adjustment screw that is threadedly engaged with the upper piston via a fixed member that abuts on the inner peripheral side of the lower piston so as to be able to adjust the adjustment screw; and an adjustment screw that contacts the upper surface of the upper piston so as to measure the axial displacement of the upper piston. Pressure is applied to the piston ring to be measured in the vertical direction of the piston ring groove, and the upper piston is moved in the axial direction with the adjustment screw allowing the upper piston to move up and down within a predetermined range. A push rod provided above the upper piston to displace it to a predetermined position; and a load transducer provided between the push rod and the upper piston to measure pressure acting in the upper and lower surface directions of the piston ring to be measured. There is provided a device for measuring pressure in the vertical direction of a piston ring, characterized in that:

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a device according to the present invention, in which a piston ring groove 4 provided on the outer circumferential surface of a piston for an internal combustion engine is divided at the upper surface to form an upper piston 2 and a lower piston 1. The pistons 1 and 2, each having a piston ring to be measured, such as a combination oil ring 5, mounted in the piston ring groove 4, are fitted onto the inner periphery of the fixed cylinder 3. The upper piston can be moved up and down by a piston ring groove axial width adjustment screw 6 that is threadedly engaged with the upper piston via a fixing member 61 that abuts on the inner peripheral side of the lower piston 1. Since the upper piston 2 is provided with an air hole 21 that penetrates in the axial direction, the air in the sealed space between the upper piston and the fixed member 61 communicates with the atmosphere and is fitted into the lower piston 1. The upper piston 2 can be moved up and down smoothly.

Set the piston ring groove axial width adjustment screw 6 to a value slightly smaller than the predetermined piston ring axial width (when measuring the displacement amount of the upper piston with the displacement meter 9, this point is set as 0 point). . In this state, the combination oil ring 5 is moved up and down two to three times on the inner periphery of the cylinder 3 in order to fit it within the piston ring groove. Thereafter, loosen the piston ring groove axial width adjustment screw 6 to ensure that the piston ring axial width (predetermined (larger than the axial width of the piston ring groove). Then push the upper piston 2 downward with the push rod 7, read the point at which the displacement becomes 0 (slightly smaller than the predetermined axial width of the piston ring) with a displacement meter, and push the rod until the predetermined piston ring groove axial width is reached. Loosen 7. Then, vibration is applied from the outside of the cylinder 3 so that the combined oil ring 5 fits into the piston ring groove and into the cylinder 3. At that time, the load is measured by a load converter 8 provided between the upper piston 2 and the pusher rod 7.

This measured pressure is applied to the pistons of the upper side rail 52 and lower side rail 51 in the combined oil ring 5 having a structure in which the expander 53 is sandwiched between the upper side rail 52 and the lower side rail 51 shown in FIG. It shows the pressure in the upper and lower surface directions against the ring groove.

Note that the present invention is not limited to combination oil rings, but can of course be applied to general pressure measurement in the axial direction of a piston in a piston ring.

[Effects of the Invention] As is clear from the above description, according to the present invention, a piston ring can be mounted in a piston ring groove provided on the outer circumferential surface of a piston for an internal combustion engine with a device having an easy and simple structure. The pressure in the vertical direction of the piston ring groove can be measured.

[Brief explanation of the drawing]

FIG. 1 shows a sectional view of the device of the invention, and FIG. 2 shows a partially enlarged sectional view of FIG. Explanation of symbols, 1... Lower piston, 2... Upper piston, 3... Cylinder, 4... Piston ring groove, 5... Combination oil ring, 6... Adjustment screw, 7... Push rod, 8... ...load transducer,
9...Displacement meter.

Claims (1)

[Scope of Claims] 1. A piston comprising an upper piston and a lower piston that are divided into upper and lower parts on the upper surface of the piston ring groove, the piston having a piston ring groove formed on the outer periphery of the piston, into which the piston length to be measured is attached; A fixed cylinder arranged to fit the piston, and a fixed member abutting on the inner circumferential side of the lower piston so that the upper piston can be moved up and down and the axial width of the piston ring groove can be adjusted. an adjustment screw threadedly engaged with the upper piston via a displacement meter disposed in contact with the upper surface of the upper piston to measure the axial displacement of the upper piston; and a piston ring to be measured located in the piston ring groove. a push rod provided above the upper piston that applies pressure in the vertical direction and displaces the upper piston to a predetermined position in the axial direction in a state where the upper piston can move up and down within a predetermined range by the adjustment screw; A device for measuring pressure in the vertical direction of a piston ring, comprising: a load transducer that is provided between a rod and an upper piston and measures pressure acting in the vertical direction of the piston ring to be measured. 2. The apparatus for measuring the pressure in the vertical direction of a piston ring according to claim 1, characterized in that the upper piston is provided with an air hole passing through it in the axial direction.