GB2125931A

GB2125931A - Overlap joint in piston ring

Info

Publication number: GB2125931A
Application number: GB08317630A
Authority: GB
Inventors: Harry Bauersfeld; Melvin J Banner; Thomas E Thornton
Original assignee: Koppers Co Inc
Current assignee: Beazer East Inc
Priority date: 1982-08-26
Filing date: 1983-06-29
Publication date: 1984-03-14
Also published as: GB2125931B; DE3307122A1; FR2532390A1; GB8317630D0; JPS5950272A; FR2532390B1

Abstract

A split ring 12 for use on pistons in hydraulic cylinders, wherein the ring has end lugs which form angles greater than 90 DEG with the ring top and ring bottom. <IMAGE>

Description

SPECIFICATION A split ring This invention relates to split rings and more particularly to lockable split sealing rings which can be used in hydraulic transmissions.

Split sealing rings for use on pistons in the cylinders of hydraulic transmissions are well known. Most of these rings are split rings which are referred to as lock-step rings because of their configuration. In such a split ring a portion of the ring body at both ends is machined away to form a lug on each end. The lug on each end then overlaps the machined-away portion of the other end. The purpose of the lock-step is to aid assembly of the piston and ring into the hydraulic transmission cylinder. The ring is placed on a groove formed for it in the piston in the locked position, i.e. the face of each lug is flush against the face of the opposing lug. The piston and ring are then placed into a chamfered bore at the end of the cylinder where the ring is urged into the operating position.The purpose of the lock-step is to prevent the ring ends from moving away from each until the ring is in the chamfered bore. In the known designs the lugs from an angle of 900 with the top and bottom faces of the ring. The prior art design of the lock-step does aid somewhat in the assembly of the piston and ring into the cylinder; but many times the ring ends move away before insertion into the chamfered bore.

According to the present invention there is provided a split ring, for use on a piston in a cylinder, which includes lugs forming a lock-step at the ends of the split ring, wherein faces of said lugs form an angle greater than 900 with the ring top and ring bottom.

The present invention overcomes the problem associated with the prior art by providing a sealing ring having a more positive lock-step. The lugs which form the lock-step of the present invention form an angle greater than 900 with the ring top and bottom.

For a better understanding of the invention and to show more clearly how the same may be carried into effect, reference will now be made, by way of example, to the accompanying drawings in which: Figure 1 is a top view of a lock-step ring of the present invention; Figure 2 is an elevational view of the lock-step ring of Figure 1; and Figur 3 is an enlarged view of the lugs formed on the end of the ring of Figure 1 in the operating position.

A lock-step ring, generally designated 10, is made of ductile iron or the like and includes an outside face 12, a top face 1 4 and a bottom face 16. It is provided with lugs 18 and 20 (Figure 1) which are respectfully opposite portions 22 and 24 cut out in the ring body. A face 26 of lug 18 forms an angle of 1000 with the top side 14 of ring 10 and a face 28 of lug 20 forms an angle of 1000 with bottom side 1 6 of ring 10. Rear face 30 of lug 1 8 is cut parallel to face 26 and face 32 of lugs 20 is cut parallel to face 28. When the ring is placed on the piston and prior to being inserted into a cylinder, not shown, face 30 contacts face 32.

In the foregoing description and in the foilowing claims the words top, bottom and side are used for convenience only and are not intended to limit the split ring of this invention to any particular orientation.

Claims

1. A split ring, for use on a piston in a cylinder, which includes rugs forming a lock-step at the ends of the split ring, wherein faces of said lugs form an angle greater than 900 with the ring top and ring bottom.

2. A split ring as claimed in claim 1, wherein said angle is in the range of from 950 to 1450.

3. A split ring, for use on a piston in a cylinder, which includes lugs forming lock-step at the ends of the split ring, each lug extending from one axial end face of the ring towards the other axial end face, the lugs having oppositely disposed faces each of which slopes towards the other lug in the direction away from the said one axial face.

4. A split ring substantially as hereinbefore described with reference to, and as shown in, the accompanying drawings.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION A split ring This invention relates to split rings and more particularly to lockable split sealing rings which can be used in hydraulic transmissions. Split sealing rings for use on pistons in the cylinders of hydraulic transmissions are well known. Most of these rings are split rings which are referred to as lock-step rings because of their configuration. In such a split ring a portion of the ring body at both ends is machined away to form a lug on each end. The lug on each end then overlaps the machined-away portion of the other end. The purpose of the lock-step is to aid assembly of the piston and ring into the hydraulic transmission cylinder. The ring is placed on a groove formed for it in the piston in the locked position, i.e. the face of each lug is flush against the face of the opposing lug. The piston and ring are then placed into a chamfered bore at the end of the cylinder where the ring is urged into the operating position.The purpose of the lock-step is to prevent the ring ends from moving away from each until the ring is in the chamfered bore. In the known designs the lugs from an angle of 900 with the top and bottom faces of the ring. The prior art design of the lock-step does aid somewhat in the assembly of the piston and ring into the cylinder; but many times the ring ends move away before insertion into the chamfered bore. According to the present invention there is provided a split ring, for use on a piston in a cylinder, which includes lugs forming a lock-step at the ends of the split ring, wherein faces of said lugs form an angle greater than 900 with the ring top and ring bottom. The present invention overcomes the problem associated with the prior art by providing a sealing ring having a more positive lock-step. The lugs which form the lock-step of the present invention form an angle greater than 900 with the ring top and bottom. For a better understanding of the invention and to show more clearly how the same may be carried into effect, reference will now be made, by way of example, to the accompanying drawings in which: Figure 1 is a top view of a lock-step ring of the present invention; Figure 2 is an elevational view of the lock-step ring of Figure 1; and Figur 3 is an enlarged view of the lugs formed on the end of the ring of Figure 1 in the operating position. A lock-step ring, generally designated 10, is made of ductile iron or the like and includes an outside face 12, a top face 1 4 and a bottom face 16. It is provided with lugs 18 and 20 (Figure 1) which are respectfully opposite portions 22 and 24 cut out in the ring body. A face 26 of lug 18 forms an angle of 1000 with the top side 14 of ring 10 and a face 28 of lug 20 forms an angle of 1000 with bottom side 1 6 of ring 10. Rear face 30 of lug 1 8 is cut parallel to face 26 and face 32 of lugs 20 is cut parallel to face 28. When the ring is placed on the piston and prior to being inserted into a cylinder, not shown, face 30 contacts face 32. In the foregoing description and in the foilowing claims the words top, bottom and side are used for convenience only and are not intended to limit the split ring of this invention to any particular orientation. Claims