Fuel pump drive system in an internal combustion engine
View Patent ↗A fuel pump drive system for an internal combustion engine uses a cam-to-cam gear from a double overhead camshaft to rotate a fuel pump gear. The fuel pump drive system may have a primary camshaft, a secondary camshaft, and the fuel pump. The primary camshaft has a camshaft gear and the cam-to-cam gear. The secondary camshaft has a cam gear. The cam gear engages the cam-to-cam gear. The fuel pump has a fuel pump gear that engages the cam-to-cam gear. The fuel pump gear drives the fuel pump.
1. A fuel pump drive system comprising:
a primary camshaft disposed in a cylinder head, wherein the primary camshaft has a camshaft gear and a cam-to-cam gear;
a secondary camshaft disposed in the cylinder head, wherein the secondary camshaft has a cam gear, and wherein the cam gear engages the cam-to-cam gear; and
a fuel pump connected to the cylinder head, wherein the fuel pump has a fuel pump gear, wherein the fuel pump gear engages the cam-to-cam gear and wherein the fuel pump is mounted in an opening formed by a front cover attached to the cylinder head.
2. The fuel pump drive system of claim 1 , wherein at least one of the camshaft gear, cam-to-cam gear, cam gear, and fuel pump gear are disposed in a cavity formed by a front cover attached to the cylinder head.
3. The fuel pump drive system of claim 1 , further comprising:
a crankshaft disposed in a crankcase, wherein the crankshaft has a crankshaft gear; and
a drive device that engages the crankshaft gear and the camshaft gear.
4. The fuel pump drive system of claim 3 , wherein the crankshaft gear is disposed in a cavity formed by a front cover attached to the cylinder head.
5. A fuel pump drive system comprising:
a first primary camshaft disposed in a first cylinder head, wherein the first primary camshaft has a first camshaft gear and a first cam-to-cam gear;
a first secondary camshaft disposed in the first cylinder head, wherein the first secondary camshaft has a first cam gear, and wherein the first cam gear engages the first cam-to-cam gear;
a fuel pump connected to the first cylinder head, wherein the fuel pump has a fuel pump gear, wherein the fuel pump gear engages the first cam-to-cam gear and wherein the fuel pump is mounted in an opening formed by a front cover attached to the first cylinder head;
a second primary camshaft disposed in a second cylinder head, wherein the second primary camshaft has a second camshaft gear and a second cam-to-cam gear;
a second secondary camshaft disposed in the second cylinder head, wherein the second secondary camshaft has a second cam gear, and wherein the second cam gear engages the second cam-to-cam gear; and
a crankcase connected to the first and second cylinder heads.
6. The fuel pump drive system of claim 5 , further comprising:
a crankshaft disposed in the crankcase, wherein the crankshaft has a first crankshaft gear and a second crankshaft gear;
a first drive device that engages the first crankshaft gear and the first camshaft gear; and
a second drive device that engages the second crankshaft gear and the second camshaft gear.
7. A method comprising the steps of:
rotating at least one primary camshaft;
rotating at least one cam-to-cam gear in response to the at least one primary camshaft;
rotating at least one secondary camshaft in response to the at least one cam-to-cam gear; and
rotating a fuel pump gear in response to one of the at least one cam-to-cam gear, wherein the fuel pump gear is separate from the at least one cam-to-cam gear.
8. The method of claim 7 , further comprising the steps of:
rotating a crankshaft;
rotating at least one drive device in response to the crankshaft; and
rotating the at least one primary camshaft in response to the at least one drive device.
9. The method of claim 7 , further comprising the steps of:
rotating a first primary camshaft;
rotating a first cam-to cam gear in response to the first primary camshaft;
rotating a first secondary camshaft in response to the first cam-to-cam gear; and
rotating a fuel pump gear in response to the cam-to-cam gear.
10. The method of claim 9 , further comprising the steps of:
rotating a second primary camshaft;
rotating a second cam-to cam gear in response to the second primary camshaft; and
rotating a second secondary camshaft in response to the second cam-to-cam gear.
11. The method of claim 10 , further comprising the steps of:
rotating a crankshaft;
rotating a first drive device in response to the crankshaft;
rotating a second drive device in response to the crankshaft;
rotating the first primary camshaft in response to the first drive device; and
rotating the second primary camshaft in response to the second drive device.