Clevis-ended suspension strut manufactured without welds

Patent metadata

Field	Value
Publication number	US-12023974-B2
Application number	US-202016926213-A
Country	US
Kind code	B2
Filing date	Jul 10, 2020
Priority date	Jul 10, 2020
Publication date	Jul 2, 2024
Grant date	Jul 2, 2024

Abstract

In accordance with one aspect of the present disclosure, a suspension strut for use on a work machine is provided. The suspension strut may have a forged one piece cylindrical inner housing that includes a hollow rod which forms a circumferential piston at an open end and a lower clevis at a closed end of the hollow rod. The suspension strut may further have a forged one piece cylindrical outer housing that includes a hollow barrel having an interior and an exterior surface, a closed end that forms an upper clevis, an open end, and a port on an outside surface of the hollow barrel. Further, the inner and outer housing may be coupled by a disk shaped end cap attached to the open end of the hollow barrel having an inner diameter that is slideably engaged with an outer surface of hollow rod.

First claim

What is claimed is:

1. A suspension strut for use on a work machine between an axle and a load carrying body, comprising:
a forged one piece cylindrical inner housing comprising a hollow rod that defines a circumferential piston at an open end and a lower clevis at a closed end, in which the lower clevis is configured to attach to the axle and a first fluid reservoir extends between the open and closed ends of the hollow rod, the hollow rod being entirely hollow in an inner volume inward of an interior surface and between the open and closed ends thereof;
a forged one piece cylindrical outer housing comprising a hollow barrel having an interior and an exterior surface, a closed end that forms an upper clevis, an open end, and a port on an outside radial surface of the hollow barrel, in which the upper clevis is configured to attach to the load carrying body and an outer surface of the circumferential piston is in slideable engagement with the interior surface of the hollow barrel, the hollow barrel being entirely hollow in an inner volume inward of the interior surface thereof and between the open and closed ends; and
a disk shaped end cap coupled to the open end of the hollow barrel having an inner diameter in slideable engagement with an outer surface of hollow rod, in which the inner diameter of the end cap is smaller than an outer diameter of the circumferential piston, the disk shaped end cap forming a second fluid reservoir defined directly by a bottom surface of the circumferential piston, the interior surface of the hollow barrel, the outer surface of the hollow rod, and a top surface of the end cap,
wherein the disk shaped end cap coupled to the open end of the hollow barrel is exposed so as to be viewable in a side elevational view of the suspension strut and so as to form an outer sidewall portion of the suspension strut, and
wherein the forged one piece cylindrical inner housing defines a drain valve at the closed end thereof,
wherein the circumferential piston at the open end of the hollow rod, which is part of the forged one piece cylindrical inner housing, forms an end-most portion of the forged one piece cylindrical inner housing,
wherein the port on the outside radial surface of the hollow barrel is adjacent to the closed end of the hollow barrel,
wherein the port extends from the outer surface of the hollow barrel to the inner surface of the hollow barrel, and is configured and sized to allow a fluid to be pumped therethrough into the first fluid reservoir, and
wherein a space exists, in a longitudinal direction of the suspension strut, between the open end of the hollow rod and the closed end of the hollow barrel under a condition where the one piece cylindrical inner housing is fully retracted within the hollow barrel of the one piece cylindrical outer housing and abuts the closed end of the hollow barrel.

2. The suspension strut of claim 1 ,
wherein the upper and lower clevis each further comprise two elongated members that independently define an aperture, the aperture configured for attachment to the work machine, and
wherein each of the upper and lower clevis has a projection extending from one of the two elongated members toward the other of the two elongated members.

3. The suspension strut of claim 1 , wherein the fluid is a hydraulic oil and the fluid is pumped through the port until the one piece inner cylindrical housing begins to extend from the one piece outer cylindrical housing, after the one piece inner cylindrical housing begins to extend a second fluid comprising a gas is pumped through the port and the port sealed.

4. The suspension strut of claim 1 ,
wherein the circumferential piston further comprises a check valve, the check valve configured to allow a fluid to flow from the first fluid reservoir into the second fluid reservoir when the circumferential piston is moved towards the closed end of the hollow barrel, and
wherein the check valve is oriented perpendicular to the longitudinal direction of the suspension strut.

5. The suspension strut of claim 4 ,
wherein the hollow rod further comprises one or more drill holes, the one or more drill holes being configured to allow a fluid to flow from the second fluid reservoir into the first fluid reservoir when the circumferential piston is moved away from the closed end of the hollow barrel, and
wherein each of the one or more drill holes is oriented perpendicular to the longitudinal direction of the suspension strut.

6. The suspension strut of claim 1 , further comprising a pressure seal, a protective seal, and a debris seal between the inner diameter of the end cap and the outer diameter of the hollow rod.

7. The suspension strut of claim 1 , wherein a circumferential top surface of the end cap is bolted onto a circumferential surface of the open end of the hollow barrel.

8. The suspension strut of claim 7 , wherein a cover plate is bolted onto a circumferential bottom surface of the end cap, the cover plate configured to release a warning pressure from the second fluid reservoir.

9. The suspension strut of claim 1 , wherein each of the one piece cylindrical outer housing and the one piece cylindrical inner housing is forged out of an alloy steel to be one piece.

10. The suspension strut of claim 1 ,
wherein an outer diameter of the disk shaped end cap is the same as an outer diameter of the outside surface of the hollow barrel,
wherein a first length of the hollow barrel is less than a second length of the hollow rod, and
wherein the outer housing is shorter than the inner housing.

11. The suspension strut of claim 1 , wherein no portion of the one piece cylindrical outer housing extends into the hollow rod when the outer surface of the cylindrical piston is in slideable engagement with the interior surface of the hollow barrel.

12. The suspension strut of claim 10 , wherein no portion of the one piece cylindrical outer housing extends into the hollow rod when the outer surface of the cylindrical piston is in slideable engagement with the interior surface of the hollow barrel.

13. The suspension strut of claim 2 , wherein the drain valve extends in a length direction of the suspension strut, the drain valve being between the two elongated members of the lower clevis.

14. A suspension strut for use on a work machine between an axle and a load carrying body, comprising:
a forged one piece cylindrical inner housing comprising a hollow rod that defines a circumferential piston at an open end and a lower clevis at a closed end, in which the lower clevis is configured to attach to the axle and a first fluid reservoir extends between the open and closed ends of the hollow rod, the hollow rod being entirely hollow in an inner volume inward of an interior surface and between the open and closed ends thereof;
a forged one piece cylindrical outer housing comprising a hollow barrel having an interior and an exterior surface, a closed end that forms an upper clevis, an open end, and a port on an outside radial surface of the hollow barrel, in which the upper clevis is configured to attach to the load carrying body and an outer surface of the circumferential piston is in slideable engagement with the interior surface of the hollow barrel, the hollow barrel being entirely hollow in an inner volume inward of the interior surface thereof and between the open and closed ends; and
a disk shaped end cap coupled to the open end of the hollow barrel having an inner diameter in slideable engagement with an outer surface of hollow rod, in which the inner diameter of the end cap is smaller than an outer diameter of the circumferential piston, the disk shaped

Assignees

• Caterpillar Inc

Inventors

• Chow Jeffrey
• Goslovich Kurt S

Classifications

• F16F9/3242

  of cylinder ends, e.g. caps · CPC title

• F16F2230/186

  with manual adjustments · CPC title

• B60G2202/242

  Pneumatic damper · CPC title

• F16F2222/126

  using gases · CPC title

• B60G2500/30

  Height or ground clearance · CPC title