초록 ▼

A rotary fluid pressure device is described as comprising a housing having fluid inlet and outlet openings and in the housing is a gerotor device having an external stator having internal teeth and a rotor within the stator having external teeth, one less in number than those on the stator. The roto

A rotary fluid pressure device is described as comprising a housing having fluid inlet and outlet openings and in the housing is a gerotor device having an external stator having internal teeth and a rotor within the stator having external teeth, one less in number than those on the stator. The rotor is eccentrically mounted with respect to the stator so that upon rotation of the rotor, the sealing engagement between the external and internal teeth forms expanding cells on one side of the line of eccentricity and forms contracting cells on the other side of the line. A drive shaft concentric with the rotor has a hollow end within the housing and a solid drive end outside of the housing. A wobble stick drivingly connects the rotor and the shaft and the wobble stick has a pivot point at its inner end connected by a rigid pivot pin with a central recess in the housing axially of the shaft which eliminates axial movement between the drive shaft and the rotor which would otherwise be caused by an uneven end formed by wear on the wobble stick. The wobble stick is selectably disengagable from drivingly connecting the rotor and the shaft through axial movement of the wobble stick. A manifold, fixed in the housing, provides a double balance pad diametrically opposite each of an inlet passage for conducting inlet fluid to each of the cells between the stator and rotor. Twelve shallow slots are hobbed over six angled holes conducting fluid to the expanding and contracting cells and over six radial holes leading to the balance pads, giving the required accuracy. A novel seal and thrust bearing structure, where the drive shaft exits from the housing, results in good concentricity of the seal carrier and a thrust bearing between the seal carrier and the adjacent end of the housing provides with a flow pumped by the bearing during rotation of the device, which results in a lower temperature on the seal and bearing.

대표청구항 ▼

1. In a rotary fluid pressure device having a housing, a presure generating member, a drive shaft, a wobble stick drivingly connecting the pressure generating member with the drive shaft, the wobble stick connected to one of the pressure generating member or drive shaft by a teeth-teeth drive, the i

1. In a rotary fluid pressure device having a housing, a presure generating member, a drive shaft, a wobble stick drivingly connecting the pressure generating member with the drive shaft, the wobble stick connected to one of the pressure generating member or drive shaft by a teeth-teeth drive, the improvement of the one of the pressure generating member or drive shaft having teeth also having an area free of teeth, the teeth of the wobble stick being selectably movable into said area free of teeth and a position of not drivingly connecting the pressure member with the drive shaft, the wobble stick being located by a rigid separate wobble stick locating pin having opposite ends engaging between the pressure generating member end of the wobble stick and the housing, and in that the rigid separate pin has two selectable effective lengths, one length locating the teeth of the wobble stick in contact with the teeth of one of the pressure generating member or drive shaft, a position of engagement, and the other length locating the teeth of the wobble stick in the area of one of the pressure generating member or drive shaft free of teeth, a position of non-engagement. 2. The structure of claim 1 characterized by the rigid separate wobble stick locating pin engaging the housing in a recess and by the addition of a plug, said plug defining the bottom of the recess, the plug being selectably movable between two positions, one position providing a shallow recess and the other position providing a deeper recess, and said motion of said plug selecting the effective length of the rigid separate pin. 3. The structure of claim 2 characterized by the addition of a spring and said spring being between the drive shaft and wobble stick, said spring providing force for the wobble stick against the rigid separate pin in either of the pin's two effective lengths. 4. In a rotary fluid pressure device having a housing, a rotor having internal drive teeth, a drive shaft having drive teeth, a wobble stick with teeth at both ends drivingly connecting the rotor with the drive shaft and a rigid separate wobble stick locating pin having opposite ends engaging between an axial recess in the rotor end of the wobble stick and a recess in the housing, the improvement of a disengagable drive, said disengagable drive comprising at least one of the rotor or drive shaft having an area free of teeth, said area free of teeth being next to the driving connecting with the wobble stick, the teeth of the wobble stick driving the rotor and drive shaft having an area free of teeth being movable into said area free of teeth, a removable plug, said plug being double ended, one end of said plug having a shallow recess and the other end of said plug having a deep recess, said removable plug being selectively attachable to said housing, said recesses in said removable plug defining the recess in the housing, the selective attachment of said removable plug causing the rigid separate wobble stick locating pin to locate the teeth of the wobble stick driving the rotor and drive shaft having an area free of teeth in respect to said area free of teeth to alter the status of the drive of the device. 5. The structure of claim 4 characterized in that said axial recess in the rotor end of the wobble stick extends substantially to the point of concentricity of the wobble stick drive shaft interconnection. 6. In a rotary fluid pressure device having a housing, a pressure generating member, a drive shaft, a wobble stick drivingly connecting the pressure generating member with the drive shaft in teeth-teeth type connections and a rigid separate wobble stick locating pin having opposite ends engaging between the pressure generating member end of the wobble stick and a recess in the housing, the improvement of a disengagable drive, said disengagable drive comprising at least one of the pressure generating member and said drive shaft having an area free of teeth, the teeth of the wobble stick driving the pressure generating member and drive shaft having an area free of teeth being movable into said area free of teeth, the recess in the housing having a depth and said depth of said recess being selectably adjustable between shallow and deep, said selectable adjustment of the depth of the recess causing the rigid separate wobble stick locating pin to locate the teeth of the wobble stick driving the pressure generating member and drive shaft having an area free of teeth in respect to said area free of teeth to alter the status of the drive of the device. 7. The structure of claim 6 characterized by the addition of an actuation pin, said actuation pin having an end, said end of said actuation pin defining the bottom of the recess in the housing and means to selectably move said actuation pin, the movement of said actuation pin adjusting the depth of the recess between shallow and deep. 8. The structure of claim 7 characterized in that said actuation pin has a second end and said second end of said actuation pin extending out of the housing. 9. The structure of claim 6 characterized in that the recess in the housing is on the centerline of the drive shaft of the rotary fluid pressure device and in that central axis of the rigid separate wobble stick locating pin differs from the centerline of the drive shaft of the rotary fluid pressure device. 10. The structure of claim 9 characterized in that the recess in the housing is on the centerline of the drive shaft of the rotary fluid pressure device and in that central axis of the rigid separate wobble stick locating pin is substantially co-extensive with the centerline of the drive shaft of the rotary fluid pressure device. 11. The structure of claim 5 characterized in that the rigid separate wobble stick locating pin engages the wobble stick in an axial recess and in that the axial recess in the wobble stick extends to the point of concentricity of the wobble stick drive shaft interconnection, the central axis of the rigid separate wobble stick locating pin being co-extensive with the central axis of the rotary fluid pressure device. 12. The structure of claim 11 characterized by the addition of a piston, said piston defining the bottom of the recess in the housing and means to selectably actuate said piston, the movement of said piston adjusting the depth of the recess between shallow and deep.