JPS6311312Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an oil ring used for lubricating oil control among piston rings used in internal combustion engines, more specifically, a spacer expander,
The present invention relates to an improvement in a combination oil ring comprising side rails disposed above and below the spacer expander and pressed in the outer circumferential direction by the spacer expander and pressed against the inner wall surface of the cylinder.

In general, the side rails constituting the combination oil ring disposed in the oil ring groove of the piston come into contact with the pad portion of the spacer expander, and while receiving the pressing force from the pad portion, the side rails that are arranged on the inner wall surface of the cylinder and the ring groove. It is arranged so as to be in contact with the side wall surface with a constant surface pressure.

Therefore, it is important to always maintain a constant state of contact between these side rails and the pads, the inner wall surface of the cylinder, and the side wall surface of the oil ring groove to improve the sealing effect of the oil ring and reduce the amount of lubricating oil consumed. This is extremely important for achieving this goal.

However, in conventional combination oil rings of this type, there is a drawback that the contact state between the side rail and the pad portion, the inner wall surface of the cylinder, and the side wall surface of the oil ring groove is difficult to stabilize. However, the effects have not been fully achieved, and further improvements have been desired.

The present invention was devised in view of this situation, and by providing a plurality of grooves or recesses on the pad surface of the spacer expander that contacts the inner circumferential side of the side rail, the side rail and spacer expander can be easily bonded. Provides a combination oil ring that restricts the relative rotation between the side rail and the side rail, improves the sealing effect by always keeping the side rail in constant contact with the cylinder inner wall surface and the ring groove side wall surface, and reduces lubricating oil consumption. The purpose is to

Hereinafter, embodiments embodying the present invention will be described based on the drawings.

In FIG. 1, the spacer expander 2 constituting the combination oil ring 1 is formed into a radially corrugated shape, and has an outer opening 211 in contact with the inner circumferential side surface of the side rail 3, and a spacer expander 2 in the outer periphery of the spacer expander 2. It has pad portions 21, 21 provided spaced apart on both sides in the direction.

The structure of the spacer expander is a semi-longitudinal wave type in this example, but an axial wave type or a U
It can also be shaped like a letter, and other configurations may be used as long as it has a pad portion.

The pad portions 21, 21 have an angle with respect to the axial direction. This is to press the side rail 3 not only in the radial direction but also in the vertical direction to obtain a sealing effect between the cylinder inner wall surface 4 and the ring groove side wall surface 61.

Side rail 3 is made from steel ribbon,
A surface treatment such as chrome plating may be applied to the outer circumferential surface of the portion 5 which contacts the inner wall surface 4 of the cylinder, if necessary.

As shown in FIGS. 2 and 3, the side rail 3
Spacer expander 2 in contact with the inner circumferential side of
A plurality of grooves 7 or recesses 8 are formed on the surfaces of the pad portions 21, 21. Such grooves 7 or recesses 8 can be easily manufactured by forming a plurality of grooves or recesses in a mold corresponding to the pad portion when press-molding the spacer expander 2.

In the combination oil ring of the present invention, a plurality of grooves or recesses are formed on the pad surface of the spacer expander that contacts the inner circumferential side of the side rail, so that the surface roughness of the pad surface becomes rough. Therefore, rotational movement of the side rail relative to the spacer expander can be prevented.

In addition, when press molding a spacer expander, a plurality of grooves or recesses are formed in the mold corresponding to the pad part, so the press formability is good and the pad part The variation in the angle with respect to the axial direction is reduced, and the contact state of the side rail with the cylinder inner wall surface and the ring groove side wall surface can always be kept in a uniform and stable state.

Furthermore, in the combination oil ring of the present invention, the plurality of grooves or recesses provided on the surface of the pad portion are formed obliquely at an angle with respect to the inner peripheral direction of the contacting side rail. Rotational movements of the rail relative to the spacer expander can be very effectively prevented.

As described above, in the combination oil ring of the present invention, the relative rotational movement between the spacer expander and the side rail is prevented, so the contact state of the side rail with the cylinder inner wall surface and the ring groove side wall surface is always uniform. can maintain a stable state. Therefore, the combination oil ring of the present invention can improve the sealing effect and reduce the consumption of lubricating oil, and the practical benefits of its implementation are extremely large.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view showing a state in which the combination oil ring of the present invention is attached to a piston and cylinder part, and FIG. 2 is a partially cutaway perspective view showing an embodiment of the combination oil ring of the present invention. FIG. 3 is a partially cutaway perspective view showing another embodiment of the combination oil ring of the present invention. In the figure, 1... combination oil ring, 2...
... Spacer expander, 211 ... Outer circumference opening, 212 ... Inner circumference opening, 3 ... Side rail,
4...Inner wall surface of the cylinder, 5... Portion in contact with the inner wall surface of the cylinder, 6... Piston, 7... Multiple grooves, 8... Multiple recesses, 21... Pad portion, 61... This is the side wall surface of the ring groove.

Claims (1)

[Claims for Utility Model Registration] 1. In a combination oil ring consisting of a side rail and a spacer expander having a pad portion, a plurality of grooves or recesses are provided on the surface of the pad portion of the spacer expander that contacts the inner peripheral side of the side rail. A combination oil ring characterized by the following: 2. Claims for registration of a utility model, characterized in that in the combination oil ring, the plurality of grooves or recesses provided on the surface of the pad portion are formed obliquely with respect to the inner circumferential direction of the side rail with which it comes into contact. The combination oil ring described in item 1.