Claims
- 1. A gear pump comprising a casing, intermeshing pumping gears carried in said casing, said pumping gears having a contact ratio of less than one, and gear transmission means connected to the respective pumping gears for rotating said pumping gears in synchronised relation with each other, said gear transmission means including intermeshed auxiliary gears, a first shaft having one of said auxiliary gears mounted thereon by an interference fit fixing the gear on the shaft by friction, said first shaft also having one of said pumping gears fixed thereon and axially spaced from said one auxiliary gear, a second shaft having the other one of said auxiliary gears fixed thereon, and also having the other said pumping gear secured thereon in axially spaced relation from the other one of said auxiliary gears, bearing means rotatably supporting said shafts in said casing, said bearing means for at least said first shaft comprising axially spaced rotary bearing elements and said one of said auxiliary gears being mounted on said first shafts between said bearing elements, an interface between said one auxiliary gear and said shaft having an annular space extending circumferentially about said shaft for pressure hydraulic fluid, and a passage through said shaft communicating with said space to convey hydraulic fluid under pressure therethrough to said annular space to cause hydraulic expansion of said one auxiliary gear to allow relative angular adjustment between said one auxiliary gear and said first shaft.
- 2. A gear pump according to claim 1 wherein said shaft supporting said one auxiliary gear has an axial end face and an entry to said passage is provided in said end face, said entry being accessible in the assembled state of the gear pump, an annular groove in said interface between said one auxiliary gear and said shaft providing said space, said passage communicating with said space at its end remote from said face entry.
- 3. A gear pump according to claim 2 further comprising a screw-threaded socket at the entry to said passage in said shaft end face for the connection of a hydraulic pressure source to the passage.
- 4. A gear pump according to claim 2 wherein the interface between said one auxiliary gear and said shaft is cylindrical in both axial directions from said annular groove and the interference fit is a transverse interference fit.
Priority Claims (1)
Number |
Date |
Country |
Kind |
16092/75 |
Dec 1975 |
CHX |
|
Parent Case Info
This is a continuation of application Ser. No. 744,782 filed on Nov. 24, 1976, now abandoned.
US Referenced Citations (10)
Continuations (1)
|
Number |
Date |
Country |
Parent |
744782 |
Nov 1976 |
|