Pump apparatus and marine vessel propelling machine
A pump apparatus includes a shaft, a first pump, and a second pump. The first pump includes a first driving gear disposed on the shaft in a first phase and rotatable with the shaft to feed a first operating fluid. The second pump includes a second driving gear disposed on the shaft in a second phase shifted from the first phase. The second driving gear is coaxial with the first driving gear and rotatable with the shaft to feed a second operating fluid.
1. A pump apparatus comprising:
a shaft;
a first pump comprising a first driving gear which is disposed on the shaft in a first phase of gear rotation and is rotatable with the shaft to feed a first operating fluid; and
a second pump comprising a second driving gear disposed on the shaft in a second phase of gear rotation, the second driving gear being coaxial with the first driving gear and rotatable with the shaft to feed a second operating fluid, wherein
the second phase is shifted from the first phase in a degree of gear rotation.
2. The pump apparatus according to claim 1 ,
wherein the first driving gear is disposed on the shaft at a first angle, and
wherein the second driving gear is disposed on the shaft at a second angle different from the first angle.
3. The pump apparatus according to claim 1 , wherein the first driving gear and the second driving gear have equal numbers of teeth.
4. A pump apparatus comprising:
a shaft;
a first pump comprising a first pair of gears, the first pair of gears comprising:
a first driving gear disposed on the shaft and being rotatable with the shaft and comprising first teeth; and
a first driven gear engaged with the first driving gear to be driven by the first driving gear so as to feed a first operating fluid, the first driven gear comprising second teeth engageable with the first teeth at a first timing when the shaft rotates; and
a second pump comprising a second pair of gears, the second pair of gears comprising:
a second driving gear disposed on the shaft and being coaxial with the first driving gear and rotatable with the shaft and comprising third teeth; and
a second driven gear engaged with the second driving gear to be driven by the second driving gear so as to feed a second operating fluid, the second driven gear comprising fourth teeth engageable with the third teeth at a second timing different from the first timing when the shaft rotates.
5. The pump apparatus according to claim 4 , wherein the first teeth, the second teeth, the third teeth, and the fourth teeth have equal numbers of teeth.
6. A vessel propelling machine comprising:
a marine-vessel-propelling-machine body comprising a propeller; and
a tilt-and-trim apparatus comprising:
a cylinder apparatus comprising:
a cylinder;
a piston which partitions an inside of the cylinder into a first chamber and a second chamber; and
a piston rod having an end fixed to the piston and extending from the cylinder; and
a pump apparatus configured to supply an operating fluid into an inside of the cylinder apparatus so as to extend and retract the cylinder apparatus, the pump apparatus comprising:
a shaft;
a first pump comprising a first pair of gears, the first pair of gears comprising:
a first driving gear disposed on the shaft and rotatable with the shaft; and
a first driven gear driven by the first driving gear so as to feed a first operating fluid;
a second pump comprising a second pair of gears, the second pair of gears comprising:
a second driving gear disposed on the shaft and being coaxial with the first driving gear and rotatable with the shaft; and
a second driven gear engaged with the second driving gear to be driven by the second driving gear so as to feed a second operating fluid; and
a passage into which the first operating fluid flows at a first timing and into which the second operating fluid flows at a second timing shifted from the first timing.
7. The pump apparatus according to claim 2 , wherein the first driving gear and the second driving gear have equal numbers of teeth.