High Pressure pump
AssigneesToyota Jidosha Kabushiki Kaisha, Denso Corporation
InventorsMasaaki Sano, Kazuhiro Asayama, Hiroshi Inoue
Life of this patent
Estimating the term…
Abstract
A high pressure fuel pump has a plunger that extends through a cylinder and is reciprocally located in a pressurizing chamber. The plunger is reciprocated by a lifter and changes the volume of the pressurizing chamber to pressurize fuel in the pressurizing chamber. A seal member seals the cylinder from the lifter to prevent fuel that leaks from the pressurizing chamber from being mixed with lubricant that lubricates the lifter. A support to which the seal member is attached is formed separately from the cylinder. The support is fixed to the cylinder with the plunger extending through the support.
Claims17
A high pressure pump, wherein a plunger is reciprocally located in a pressurizing chamber that is formed in a cylinder, wherein the plunger is reciprocated by a driving member and changes the volume of the pressurizing chamber thereby pressurizing fluid in the pressurizing chamber, the pump comprising:
- a seal member that is located outside of the cylinder, wherein the seal member seals the cylinder from the driving member thereby preventing fluid that leaks from the pressurizing chamber from being mixed with lubricant that lubricates the driving member;
- a support that is formed separately from the cylinder, wherein the seal member is attached to the support;
- and
- a bracket that fixes the cylinder to the support, wherein the support is fixed to the cylinder with the plunger extending through the support, and wherein the support is fixed to the cylinder with the support held between the bracket and the cylinder.
A high pressure pump, wherein a plunger is reciprocally located in a pressurizing chamber that is formed in a cylinder, wherein the plunger is reciprocated by a lifter and changes the volume of the pressurizing chamber thereby pressurizing fuel in the pressurizing chamber, the pump comprising:
- a support that is formed separately from the cylinder;
- a seal member that is located outside of the cylinder and is attached to the support, wherein the seal member includes a metal tube, a rubber piece that covers the inner surface of the tube and a pair of spaced lips, wherein the lips contact the surface of the plunger, wherein the seal member is attached to the support by press fitting the tube into the support, wherein the seal member seals the cylinder from the lifter thereby preventing fuel that leaks from the pressurizing chamber from being mixed with lubricant that lubricates the lifter;
- and
- a bracket that fixes the cylinder to the support, wherein the support is fixed to the cylinder with the plunger extending through the support, and wherein the support is fixed to the cylinder with the support held between the bracket and the cylinder.
Dependencies are inferred from the claim text.