Abstract A hydraulic valve lifter having function to stop valve drive comprises a cylinder, a lifter body sliding in the cylinder, a cam driving the lifter body, a tappet sliding in the lifter body, a valve driven by the tappet, a plunger located between the lifter body and the tappet, a reservoir formed in the lifter body and being in fluid communication with a hydraulic source always, a first pressure room formed in the tappet and separated from the reservoir via the plunger, a check valve controlling a communication between the reservoir and the first pressure room, a piston sliding in the lifter body and having a rod driving the check valve, a second pressure room located at one side of the piston and being in fluid communication with the hydraulic source via a control valve, a room located at the other side of the piston, and a passage decreasing a pressure in the room.
Inventors
👤 Toru Fujikawa
👤 Yasuhiro Kobayashi
👤 Tadashi Terazawa
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-11-07 22:19
CPC Classifications
F; F01; F01L; F01L13/00; F01L13/0005
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
154 words
A hydraulic valve lifter having function to stop valve drive comprising: a cylinder; a lifter body sliding in the cylinder; a cam driving the lifter body; a tappet sliding in the lifter body; a valve driven by the tappet; a plunger located between the lifter body and the tappet; a reservoir formed in the lifter body and being in fluid communication with a hydraulic source always; a first pressure room formed in the tappet and separated from the reservoir via the plunger; a check valve controlling a communication between the reservoir and the first pressure room; a piston sliding in the lifter body and having a rod driving the check valve; a second pressure room located at one side of the piston and being in fluid communication with the hydraulic source via a control valve; a room located at the other side of the piston; and a passage decreasing a pressure in the room.
Claim 2
Dependent Claim
154 words
A hydraulic valve lifter having function to stop valve drive comprising: a cylinder; a lifter body sliding in the cylinder; a cam driving the lifter body; a tappet sliding in the lifter body; a valve driven by the tappet; a plunger located between the lifter body and the tappet; a reservoir formed in the lifter body and being in fluid communication with a hydraulic source always; a first pressure room formed in the tappet and separated from the reservoir via the plunger; a check valve controlling a communication between the reservoir and the first pressure room; a piston sliding in the lifter body and having a rod driving the check valve; a second pressure room located at one side of the piston and being in fluid communication with the hydraulic source via a control valve; a room located at the other side of the piston; and a passage decreasing a pressure in the room.
Claim 3
Dependent Claim
39 words
A hydraulic valve liter having function to stop valve drive as set forth in claim 1 further comprising a controller for controlling the control valve in the opening condition when a vertical motion of the valve is not needed.