Axial piston unit

Claim 2

An axial piston unit of the type comprising a drive shaft and a cylinder having an inclined cylinder axis, means defining an outlet for said axial piston unit, support means for said drive shaft, said support means incorporating a substantially ringshaped hydrostatic axial sliding bearing means acted upon by the pressure of the fluid medium, said hydrostatic axial sliding bearing means including rotor means and stator means, and at least one throttle means for delivering the pressure of the fluid medium to said hydrostatic sliding bearing means, said throttle means communicating with said outlet and operably communicating with said axial sliding bearing, the throttling action of said throttling means being at least partially suppressed during low pressure of the fluid medium and becoming more pronounced during increasing pressure of the fluid medium.

Claim 3

An axial piston unit as defined in claim 1 wherein said support means for said drive shaft further includes an axial roller bearing means arranged in series with said hydrostatic axial sliding bearing means.

Claim 4

An axial piston unit as defined in claim 2, further including a housing, said rotor means including a first rotor element and a second rotor element, said stator means incorporating a pivotably mounted stator bowllike element arranged between said housing and said second rotor element.

Claim 5

An axial piston unit as defined in claim 2, wherein said support means further including at least an inner radial bearing means, said rotor means encompassing a first rotor element and a second rotor element, said second rotor element carrying both said axial sliding bearing means as well as said inner radial roller bearing means.

Claim 6

An axial piston unit as defined in claim 1, wherein said throttle means includes a throttle piston which is conically tapered at one end region thereof.

Claim 7

An axial piston unit of the type comprising a drive shaft and a cylinder having an inclined cylinder axis, support means for said drive shaft, said support means incorporating a substantially ring-shaped hydrostatic axial sliding through the agency of said measuring piston, bearing means acted upon by the pressure of the fluid medium, said hydrostatic axial sliding bearing means including rotor means and stator means, and at least one throttle means for delivering the pressure of the fluid medium to said hydrostatic sliding bearing means, the throttling action of said throttling means being at least partially suppressed during low pressure of the fluid medium and becoming more pronounced during increasing pressure of the fluid medium, said throttle means including a substantially cylindrical throttle piston and provided with a throttle cross section which is formed by at least one groove means, the effective length of which is dependent upon the position of said cylindrical throttle piston, said position of said cylindrical throttle piston being regulated as a function of the operating pressure of the fluid medium.

Claim 8

An axial piston unit of the type comprising a drive shaft and a cylinder having an inclined cylinder axis, support means for said drive shaft, said support means incorporating a substantially ring-shaped hydrostatic axial sliding through the agency of said measuring piston, bearing means acted upon by the pressure of the fluid medium, said hydrostatic axial sliding bearing means including rotor means and stator means, and at least one throttle means for delivering the pressure of the fluid medium to said hydrostatic sliding bearing means, the throttling action of said throttling means being at least partially suppressed during low pressure of the fluid medium and becoming more pronounced during increasing pressure of the fluid medium, said throttle means including a substantially cylindrical throttle piston and provided with a throttle cross section which is formed by at least one groove means, the effective length of which is dependent upon the position of said cylindrical throttle piston, said position of said cylindrical throttle piston being regulated as a function of the operating pressure of the fluid medium.

Claim 9

An axial piston unit of the type comprising a drive shaft and a cylinder having an inclined cylinder axis, support means for said drive shaft, said support means incorporating a substantially ring-shaped hydrostatic axial sliding bearing means acted upon by the pressure of the fluid medium, said hydrostatic axial sliding bearing means including rotor means and staTor means, and at least one throttle means for delivering the pressure of the fluid medium to said hydrostatic sliding bearing means, the throttling action of said throttling means being at least partially suppressed during low pressure of the fluid medium and becoming more pronounced during increasing pressure of the fluid medium, said throttle means incorporating a throttle piston and a measuring piston, said operating pressure acting upon said throttle piston through the agency of said measuring piston.

Claim 10

An axial piston unit of the type comprising a drive shaft and a cylinder having an inclined cylinder axis, support means for said drive shaft, said support means incorporating a substantially ring-shaped hydrostatic axial sliding bearing means acted upon by the pressure of the fluid medium, said hydrostatic axial sliding bearing means including rotor means and staTor means, and at least one throttle means for delivering the pressure of the fluid medium to said hydrostatic sliding bearing means, the throttling action of said throttling means being at least partially suppressed during low pressure of the fluid medium and becoming more pronounced during increasing pressure of the fluid medium, said throttle means incorporating a throttle piston and a measuring piston, said operating pressure acting upon said throttle piston through the agency of said measuring piston.

Claim 11

An axial piston unit of the type comprising a drive shaft and a cylinder having an inclined cylinder axis, support means for said drive shaft, said support means incorporating a substantially ring-shaped hydrostatic axial sliding bearing means acted upon by the pressure of the fluid medium, and an axial roller-bearing means arranged in series with said hydrostatic axial sliding bearing means, said hydrostatic axial sliding bearing means including rotor means and stator means, and at least one throttle means for delivering the pressure of the fluid medium to said hydrostatic sliding bearing means, the throttling action of said throttling means being at least partially suppressed during low pressure of the fluid medium and becoming more pronounced during increasing pressure of the fluid medium, said throttle means including a substantially cylindrical throttle piston and provided with a throttle cross section which is formed by at least one groove means, the effective length of which is dependent upon the position of said cylindrical throttle piston, said position of said cylindrical throttle piston being regulated as a function of the operating pressure of the fluid medium.

Claim 12

An axial piston unit of the type comprising a drive shaft and a cylinder having an inclined cylinder axis, support means for said drive shaft, said support means incorporating a substantially ring-shaped hydrostatic axial sliding bearing means acted upon by the pressure of the fluid medium, and an axial roller-bearing means arranged in series with said hydrostatic axial sliding bearing means, said hydrostatic axial sliding bearing means including rotor means and stator means, and at least one throttle means for delivering the pressure of the fluid medium to said hydrostatic sliding bearing means, the throttling action of said throttling means being at least partially suppressed during low pressure of the fluid medium and becoming more pronounced during increasing pressure of the fluid medium, said throttle means including a substantially cylindrical throttle piston and provided with a throttle cross section which is formed by at least one groove means, the effective length of which is dependent upon the position of said cylindrical throttle piston, said position of said cylindrical throttle piston being regulated as a function of the operating pressure of the fluid medium.

Claim 13

An axial piston unit of the type comprising a drive shaft and a cylinder having an inclined cylinder axis, support means for said drive shaft, said support means incorporating a substantially ring-shaped hydrostatic axial sliding bearing means acted upon by the pressure of the fluid medium, and an axial roller-bearing means arranged in series with said hydrostatic axial sliding bearing means, said hydrostatic axial sliding bearing means including rotor means and stator means, and at least one throttle means for delivering the pressure of the fluid medium to said hydrostatic sliding bearing means, the throttling action of said throttling means being at least partially suppressed during low pressure of the fluid medium and becoming more pronounced during increasing pressure of the fluid medium, said throttle means incorporating a throttle piston and a measuring piston, said operating pressure acting upon said throttle piston through the agency of said measuring piston.

Claim 14

An axial piston unit of the type comprising a drive shaft and a cylinder having an inclined cylinder axis, support means for said drive shaft, said support means incorporating a substantially ring-shaped hydrostatic axial sliding bearing means acted upon by the pressure of the fluid medium, and an axial roller-bearing means arranged in series with said hydrostatic axial sliding bearing means, said hydrostatic axial sliding bearing means including rotor means and stator means, and at least one throttle means for delivering the pressure of the fluid medium to said hydrostatic sliding bearing means, the throttling action of said throttling means being at least partially suppressed during low pressure of the fluid medium and becoming more pronounced during increasing pressure of the fluid medium, said throttle means incorporating a throttle piston and a measuring piston, said operating pressure acting upon said throttle piston through the agency of said measuring piston.