ELECTRONICALLY CONTROLLED HYDRAULIC SWING SYSTEM

摘要

A hydraulic circuit for use on a construction machine includes a first valve, a second valve, and at least a third valve. The second and third valve each includes at least one inlet port connected to a first outlet port of the first valve. The first outlet port of each of the second and third valves are configured to reduce a first pressure to a second pressure and/or a third pressure downstream of the second valve and the third valve, respectively. The second valve and the third valve also include at least a second outlet port connected to a reservoir tank. A hydraulic motor is connected to the first outlet port of the second valve, which operates the hydraulic motor in a first direction. The hydraulic motor also is connected to the first outlet port of the third valve, which operates the hydraulic motor in a second direction.

主权项

1. A hydraulic circuit for use on a construction machine, said hydraulic circuit comprising:
a) at least one tank configured for providing hydraulic fluid to and receiving hydraulic fluid from said hydraulic circuit; b) at least one hydraulic pump connected to said at least one tank, said hydraulic pump providing a flow of hydraulic fluid to said hydraulic circuit at an initial pressure; c) a first valve configured to maintain a first pressure in said hydraulic circuit downstream of said first valve, said first valve including:
i. at least one inlet port connected to said hydraulic pump;ii. a first outlet port;iii. at least a second outlet port connected to said tank, said second outlet port configured to return an excess of hydraulic fluid to said tank from said second outlet port; d) a second valve that includes:
i. at least one inlet port connected to said first outlet port of said first valve;ii. a first outlet port over which said second valve is configured to reduce said first pressure to a second pressure downstream of said first outlet port of said second valve;iii. at least a second outlet port connected to said tank, said second outlet port configured to return excess hydraulic fluid to said tank; e) at least a third valve that includes:
i. at least one inlet port connected to said first outlet port of said first valve;ii. a first outlet port over which said third valve is configured to reduce said first pressure to a third pressure downstream of said first outlet port of said third valve;iii. at least a second outlet port connected to said tank, said second outlet port configured to return excess hydraulic fluid to said tank; and, f) a hydraulic motor connected to said first outlet port of said second valve to operate said hydraulic motor in a first direction, and said hydraulic motor connected to said first outlet port of said third valve to operate said hydraulic motor in a second direction.