JPH0112028Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a piston, particularly a piston for a horizontal reciprocating engine.

[Prior Art] The piston of a horizontal reciprocating engine is equipped with a rider ring to prevent direct contact between the piston and the inner surface of the cylinder. However, such rider rings have the problem that only the outer circumferential surface of the lower end wears because they are constantly subjected to the load of the piston, shortening their lifespan and requiring replacement within a short period of time.

[Purpose of the invention] The purpose of the invention is to significantly extend the life of the rider ring.

[Configuration of the Invention] The present invention has a configuration in which a rider ring having a thick wall portion with a large wear allowance at the lower part in the circumferential direction is non-rotatably attached to the outer periphery of the piston.

[Examples] Examples of the present invention will be described below based on the drawings.

FIG. 1 shows an example of the present invention, in which a rider ring 3 is attached to the outer periphery of a piston 2 that reciprocates in the direction of the horizontal arrow within a horizontal cylinder 1, the lower part being thicker than the upper part. In the figure, numeral 4 indicates a piston ring provided on the outer periphery of the piston 2 to seal between the piston 2 and the inner surface of the cylinder 1, 5 a piston rod, and 6 a piston tightening nut.

2 and 3 show detailed examples of the rider ring 3. The rider ring 3 has an uneven thickness shape in which the inner diameter is appropriately eccentric upwards with respect to the outer circumference, and is formed on the outer circumference of the piston 2. A positioning fitting 9 is fitted into a mounting groove 7 (FIG. 1) of uniform depth and fitted into a cutout 8 formed at the thinnest part of the upper end, and is fixed to the piston 2 by a fixing bolt 10. As a result, the rider ring 3 is supported around the piston 2 so as not to rotate.

As described above, by providing the rider ring 3 with a large wall thickness at the lower part in the circumferential direction, the wear allowance can be increased accordingly, so the life of the rider ring 3 can be extended and the frequency of its replacement can be reduced. I can do it.

4 and 5 show the case where the rider ring 3 is divided vertically into two parts 3a and 3b at the horizontal diameter part.
FIG. 5 shows a case where the lower member 3b is a thick-walled semi-cylinder and the upper member 3a is a thin-walled semi-cylinder, and the upper member 3a and the lower member 3b are separately rotated by positioning machine screws 11 and 12. It has become impossible to do so. This method can also achieve the same effect as the embodiment described above, and according to this method, it is mainly the lower member 3b that wears out, so when it wears out, the lower member 3b It also has the advantage that only 3b needs to be replaced.

Note that the present invention is not limited to the above-mentioned embodiments, and various changes may be made without departing from the gist of the present invention.

[Effects of the invention] As described above, the piston of the horizontal reciprocating engine of the invention is equipped with a rider ring whose wall thickness is thicker on the lower side than on the upper side in the circumferential direction, thereby increasing the amount of wear. This provides an excellent effect of significantly extending the service life.

[Brief explanation of the drawing]

FIG. 1 is an overall side view showing an embodiment of the present invention;
Figure 2 is a front view showing an example of the shape of the rider ring;
FIG. 3 is a partially cutaway plan view of FIG. 2, and FIGS. 4 and 5 are front views showing other examples of the bisected rider ring. 1 is a cylinder, 2 is a piston, 3 is a rider ring, 7 is a mounting groove, 8 is a cutout, 9 is a positioning metal fitting, 10 is a fixing bolt, 11, 12 is a positioning machine screw, 3a is an upper side member, 3b is a lower side Shows the parts.

Claims (1)

[Scope of utility model registration request] A piston for a horizontal reciprocating engine, characterized in that a rider ring whose lower side is thicker than its upper side in the circumferential direction is attached to the outer periphery of the piston so that it cannot rotate in the circumferential direction.