JPH0613420Y2 - piston ring - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a piston ring, and in particular, a protrusion is provided at one end of an abutment portion of an elastic member, and a hole for locking the protrusion is provided at the other end. The present invention relates to a piston ring that is provided to prevent riding when an oil ring is attached and has a simple structure to reduce cost.

[Conventional technology]

Three to four piston rings are fitted on the piston. The top two or three piston rings are called compression rings, and the compression rings maintain the airtightness of the combustion chamber and the crank chamber and also transfer the heat of the piston to the cylinder.
The lower part of the piston ring is called an oil ring. This oil ring forms an oil film on the inner surface of the cylinder and scrapes off excess lubricating oil.

[Problems to be solved by the invention]

By the way, in the conventional piston ring, there are various measures for preventing the riding of the abutment portion of the oil ring.

For example, as shown in FIG. 7, coating (arrow P part) is applied to both ends of the abutment portion 116 of the oil ring 110, and the riding state of the abutment portion 116 is visually observed by this coating.

Further, as shown in FIG. 8, holes 130, 130 are formed at both end portions of the abutment portion 116 of the oil ring 110, and the cord 132 is penetrated through the hole portions 130, 130 to make the abutment portion 11
There is something to prevent riding up of No. 6.

Furthermore, Japanese Patent Laid-Open No. 60-220263 and Shokai 59-
There is one disclosed in Japanese Patent No. 121558. JP-A-6
What is described in Japanese Unexamined Patent Publication No. 0-220263 is to fill a thermosetting synthetic resin into the openings at the inner peripheral portions of both ends of the abutment portion and heat-set the thermosetting synthetic resin to fix the opening portion. It prevents the club from riding up. In addition, 59
According to Japanese Patent Laid-Open No.-121558, a bridging member bridging a trough portion of an oil ring and at least one trough portion subsequent thereto is provided, and the bridging member prevents the abutment portion from riding up.

However, in the above-described method of applying coating to both ends of the oil ring, there is no certainty by visually recognizing whether or not the riding state of the abutment portion 116 has occurred, and furthermore, the riding state of the abutment portion occurs. Even when it is done, it can be assembled in the cylinder, the followability to the cylinder block is poor, and the oil consumption is large.

Also, a method of penetrating the cords through the holes at both ends of the abutment, a method of fixing the openings by thermosetting a thermosetting synthetic resin to the openings at the inner periphery of both ends of the abutment, or a valley of the oil ring. In the measure in which the bridging member bridging the portion and at least one trough subsequent thereto is provided, there is a disadvantage that the structure becomes complicated, the manufacturing becomes difficult, the cost becomes large, and it is economically disadvantageous. is there.

[Purpose of device]

Therefore, an object of the present invention is, in order to eliminate the above-mentioned inconvenience, a substantially corrugated elastic member formed by projecting an oil ring of a piston ring in one direction at predetermined intervals and projecting both ends in one direction. A combination shape consisting of two metal thin plates that are in contact with both ends of the member,
By forming a protrusion at one end of the abutment of the elastic member toward the other end by bending, and providing a hole at the other end to prevent the abutment from riding up, the oil is provided. It is intended to realize a piston ring that can reliably prevent riding when the ring is attached, can have a simple structure, and can reduce the cost.

[Means for solving problems]

In order to achieve this object, the present invention relates to a piston ring having a compression ring and an oil ring fitted on the upper part of the piston, wherein the oil ring is projected in one direction at predetermined intervals and both ends are also in one direction. A protrusion that has a combination of a substantially corrugated elastic member formed by projecting and two thin metal plates that are in contact with both ends of the elastic member, and that is directed toward the other end at one end of the abutment portion of the elastic elastic member. The bent portion is formed, and the other end is provided with a hole portion for locking the projection portion to prevent the abutment portion from riding up.

[Action]

With the above configuration, when the piston ring is fitted to the upper part of the cylinder, the protrusion at one end of the abutment part of the elastic member is locked in the hole at the other end to ensure the riding when the oil ring is mounted. In addition to the prevention, the piston ring has a simple structure to reduce the cost.

〔Example〕

An embodiment of the present invention will be described in detail below with reference to the drawings.

1 to 6 show an embodiment of this invention. Second
In the figure, 2 is a piston ring. As shown in FIGS. 2 and 3, three piston rings 2 are fitted to the piston 4, for example. The two upper parts of the piston ring 2 are compression rings 8 that maintain the airtightness of the combustion chamber and the crank chamber (not shown) and transfer the heat of the piston 4 to the cylinder 6, and the lower part of the piston ring 2 is one. Is an oil ring 10 that forms an oil film on the inner surface of the cylinder 6 and scrapes off excess lubricating oil.

As shown in FIGS. 1 and 5, the oil ring 10 has a substantially corrugated elastic member 1 formed by protruding in one direction at predetermined intervals, for example, in the outward direction and projecting both ends in one direction.
2 and, as shown in FIG. 4, the elastic member 12 is formed in a combined shape consisting of two metal thin plates 14a and 14b which are in contact with both side ends of the elastic member 12, respectively.

In addition, a protrusion 18 is integrally bent at one end 16a of the abutment portion 16 of the elastic member 12 so as to be directed to the other end 16b described later, and a hole for locking the protrusion 18 at the other end 16b. The part 20 is formed.

At this time, as shown in FIG. 5, the formation height position of the protruding portion 18 of the one end 16a is set to be approximately 1 / 2H as compared with the height H of the elastic member 12, and the protruding portion 18 is fixed to the one end 16a.
One place is formed in the center of the upper part of a. Also, the other end 16b
Of the other end 16b is set to H
One hole 20 is bored at the height position, that is, the position corresponding to the protrusion 18.

Reference numeral 22 is a piston pin, 24 is a piston skirt, 26 is a piston boss into which the piston pin 22 is inserted,
28 is a ring groove formed in the upper part of the piston 4.

Next, the operation will be described.

When the compression ring 8 and the oil ring 10 of the piston ring 2 are fitted in the ring groove 28 of the upper portion of the piston 4, as shown in FIG. Is locked in the hole 20 of the other end 16b to reliably prevent riding.

That is, when the riding state occurs, as shown in FIG. 6, the protrusion 18 overlaps with the other end 16b of the elastic member 12 to increase the thickness h of the riding portion by about 1.5 times, and Since it is larger than the inner diameter of 6 and cannot be assembled in the cylinder 6, the occurrence of the riding state can be surely recognized, which is practically advantageous.

Also, one end 16 of the elastic member 12 of the oil ring 10 is
The protrusion 18 and the hole are formed on the other end 16b so that the protrusion 18 is integrally bent so as to be directed to the other end 16b. The portion 20 can be formed extremely easily, the structure of the oil ring 10 can be simplified, and the cost can be reduced,
Economically advantageous.

The invention is not limited to the above-described embodiment, but various application modifications can be made.

For example, in the embodiment of the present invention, one protrusion is bent at one end of the joint of the elastic member, and
Although one hole is formed at the other end and the protrusion is locked in the hole to prevent the abutment part from climbing up, two or more holes are formed on the one end and the other end. It is also possible to form them respectively to prevent the abutment portion from riding up.

[Effect of device]

As described in detail above, according to the present invention, a substantially corrugated elastic member formed by protruding the oil ring of the piston ring in one direction at predetermined intervals and projecting both ends in one direction, and both sides of this elastic member. The elastic member has a combination shape composed of two metal thin plates that are in contact with each other, and a protrusion is bent at one end of the abutment portion of the elastic member so as to be directed toward the other end, and the protrusion is formed at the other end. Since a hole is provided to prevent the riding of the abutment part by locking, the thickness of the riding part when the riding state occurs due to the protrusion provided at one end makes the mounting inside the cylinder impossible. It is possible to reliably recognize the occurrence of the riding state, and it is possible to reliably prevent the riding of the abutment portion by locking the projection portion to the hole portion, which is practically advantageous. Further, since the protrusion is integrally bent at one end of the elastic member member of the oil ring and the hole is formed at the other end, the protrusion and the hole can be formed very easily. In addition, the structure of the oil ring is simplified, the cost can be reduced, and it is economically advantageous.

[Brief description of drawings]

1 to 6 show an embodiment of the present invention, FIG. 1 is an enlarged perspective view of an essential part of an elastic member of an oil ring, FIG. 2 is a schematic perspective view of a piston, and FIG. 3 is a piston inserted in a cylinder. FIG. 4 is an enlarged view of an arrow IV portion in FIG. 3, and FIG. 5 is a schematic enlarged plan view of the engagement state of the protrusion and the hole of the abutment portion of the oil ring. The figure is a schematic enlarged plan view of a state in which the abutment portion of the oil ring has run up. 7 and 8 show the prior art of the present invention. FIG. 7 is an enlarged perspective view of an essential part of an elastic member of an oil ring, and FIG. 8 is an enlarged perspective view of an essential part of an elastic member of an oil ring. In the figure, 2 is a piston ring, 4 is a piston, 6
Is a cylinder, 8 is a compression ring, 10 is an oil ring, 12 is an elastic member, 14a and 14b are thin metal plates, 16 is an abutment portion, 16a and 16b are both ends of the abutment portion, 1
8 is a protrusion, 20 is a hole, 22 is a piston pin, 24 is a piston skirt, 26 is a piston boss, 28 is a ring groove, and S is a predetermined interval.

Claims (1)

[Scope of utility model registration request] 1. A piston ring having a compression ring and an oil ring fitted on the upper part of the piston, wherein the oil ring is formed so as to project in one direction at predetermined intervals and both ends thereof also project in one direction. The corrugated elastic member and the both ends of this elastic member are in contact with each other 2
A combination shape composed of a plurality of metal thin plates is formed, and at one end of the abutment portion of the elastic member, a projection portion directed toward the other end is bent and formed, and at the other end, the projection portion is locked and Piston ring that has a hole to prevent riding.