US 12,146,571 B2
Hydraulic tensioner
Paul Freemantle, Lansing, NY (US)
Assigned to BORGWARNER INC., Auburn Hills, MI (US)
Appl. No. 18/247,290
Filed by BORGWARNER INC., Auburn Hills, MI (US)
PCT Filed Oct. 5, 2020, PCT No. PCT/US2020/054276
§ 371(c)(1), (2) Date Mar. 30, 2023,
PCT Pub. No. WO2022/075967, PCT Pub. Date Apr. 14, 2022.
Prior Publication US 2023/0407945 A1, Dec. 21, 2023
Int. Cl. F16H 7/08 (2006.01)
CPC F16H 7/0834 (2013.01) [F16H 2007/0806 (2013.01); F16H 2007/0812 (2013.01); F16H 2007/0859 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A hydraulic tensioner comprising:
a) a body;
b) a rod having a first end affixed to the body, a second end, an inner bore forming a low pressure chamber, and an outer surface;
c) a piston having an inner end, an outer end, and an inner bore slidably fitted around the outer surface of the rod, the inner bore of the piston and the second end of the rod forming a high pressure chamber;
d) a first check valve mounted to the second end of the rod, controlling flow between the high pressure chamber and the low pressure chamber;
e) a seal for the high pressure chamber on the second end of the rod, sealing to the inner bore of the piston between the first check valve and the second end of the rod, clipping to the second end of the rod;
f) an external spring mounted around the outer surface of the rod and an outer surface of the piston between the inner end of the piston and the body, providing a force between the body and the inner end of the piston, biasing the piston outwardly relative to the body.