US3545340A - Axial piston unit - Google Patents

Axial piston unit Download PDF

Info

Publication number
US3545340A
US3545340A US734152A US3545340DA US3545340A US 3545340 A US3545340 A US 3545340A US 734152 A US734152 A US 734152A US 3545340D A US3545340D A US 3545340DA US 3545340 A US3545340 A US 3545340A
Authority
US
United States
Prior art keywords
pivotal
pivot
support body
axial piston
piston unit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US734152A
Other languages
English (en)
Inventor
Gerhard Bobst
Walter Kaser
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Von Roll AG
Original Assignee
Von Roll AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Von Roll AG filed Critical Von Roll AG
Application granted granted Critical
Publication of US3545340A publication Critical patent/US3545340A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
    • F01B3/00—Reciprocating-piston machines or engines with cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F01B3/0032—Reciprocating-piston machines or engines with cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
    • F01B3/0044—Component parts, details, e.g. valves, sealings, lubrication
    • F01B3/0064—Machine housing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
    • F01B3/00—Reciprocating-piston machines or engines with cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F01B3/0032—Reciprocating-piston machines or engines with cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
    • F01B3/0035—Reciprocating-piston machines or engines with cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block having two or more sets of cylinders or pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H39/00—Rotary fluid gearing using pumps and motors of the volumetric type, i.e. passing a predetermined volume of fluid per revolution
    • F16H39/04—Rotary fluid gearing using pumps and motors of the volumetric type, i.e. passing a predetermined volume of fluid per revolution with liquid motor and pump combined in one unit
    • F16H39/06—Rotary fluid gearing using pumps and motors of the volumetric type, i.e. passing a predetermined volume of fluid per revolution with liquid motor and pump combined in one unit pump and motor being of the same type
    • F16H39/08—Rotary fluid gearing using pumps and motors of the volumetric type, i.e. passing a predetermined volume of fluid per revolution with liquid motor and pump combined in one unit pump and motor being of the same type each with one main shaft and provided with pistons reciprocating in cylinders

Definitions

  • Kleeman ABSTRACT An axial piston unit of the type having an inclined axis, comprising a support body means and a pivotal head means.
  • a pivotal body means including pivot pin means serves to mount the pivotal body means by means of such pivot pin means at the aforesaid pivotal head means, said pivotal body means being pivotable relative to said support body means.
  • Means serve for detachably connecting the pivotal head means with the support body means through the provision of a frictional contact connection.
  • the present invention relates to a newand improved axial piston unit.
  • These units are employed in larger numbers nowadays in the hydraulic oil'art as pumps and motors, also as adjustable units aswell as constant or invariable units, above all mainly in two constructional embodiments, namely as a unit where the axis is at an inclination and also as a unit where the plate is at an inclination.
  • pivotalbody member which "accommodates the cylinder with the pistons and the control plate, with cylindrical pivot pins which permit a pivotal motionabout an axis at the entrainment plane of the drive plate or flange.
  • the infeed and outfeed of the driving medium takes placevia the aforementioned pivot pins which, for this purpose, have been bored hollow and via arotary packing box lead to the stationary housingportion.
  • the drive shaft with the drive plate or flange is mounted in a stationary housing which is generally designated as a support or bearing body.
  • This housing also takes up axial forces:
  • the drive shaft is generally mounted by means of two radial bearings and, an axial bearing in thesupport body.
  • the connection between the pivotal body and the'support body generally takes place via I two straps or brackets which are threaded to the support body and a respective bore for receiving one of the cylindrical pivot pins of 'thepivotal body Pivot heads are screwed to these brackets and sealing sleeves or bushings are mounted in such pivot heads which also possess conduit portions, such as elbows or pipe studs or connections at which there can be attached the connection conduits.
  • connection of the brackets with the support body takes place by means of screws and fitting pins.
  • these fitting pins are greatly loaded.
  • these fitting pins together with the corresponding bores are plastically deformed owing to the concentration of stresses which occurs at the parting or separating surfaces. Since, additionally, there occur so-called spreading forces on account of the pressure in the infeed and delivery components, a this connection lacks any sufficient rigidity and therefore, is only usable for very small pressures.
  • pivot head is secured to the bracket portion and has the function of forming a suitable connection for the conduit means which are to be connected.
  • Another, more specific object of the present invention relates to an improved axial piston unit which can be effectively employed as a hydraulic pump or a hydraulic motor, and which is relatively simple in construction, quite economical to manufacture, highly reliable in operation, and not readily sub ject to breakdown.
  • the inventive construction is generally characterized byvthe featuresthat the pivot head accommodates the support.
  • means for the pivot pins and such is detachably connected with the support body by a frictional contact connection.
  • FIGS. 1 and 2 designates the drive shaft, and reference numeral 2 the drive plate or flange which is rigidly connected with the drive shaft 1 or formed of one piece together with such shaft.
  • the drive shaft 1 as well as the drive plate 2 are mounted at a support or bearing body member 5 by means of both of the radial bearing 3'and 3" and the axial bearing 4, here constructed and illustrated as an inclined roller bearing, by way of example.
  • the support body 5 is sealed towards the outside by means of the cover member 6, the sealing means 7, for instance in the form of a lip-sealing arrangement not shown in greater detail, and the traveling ring 8 for such lip-sealing arrangement. I d
  • the pivot head Q in which the pivotal. body member 10 with its pivot pins or trunnion means 11 is mounted in a slide or sleeve bearing means 12 which has not been illustrated in reference to the annexed greater detail, is threadablycbnne'cted by means of the screws 7 1 3 or the like with the support body 5 in such a way that the corresponding to the width of the diameter of 'a pivot pin.
  • This milled portion or slot is bridged by the support ring for the members 13 andthe fitting pins 15 provided for positional fixing are not subjected to shear forces.
  • the cylinder 16 provided with the piston members 17 is mounted at the guide rod 18.
  • the pistons 17 together with the piston rods l9 and the guide rod 18 are articulated by means of suitable ball and socket joints to the drive plate of flange 2.
  • the conduits 20 provided at the pivotal body member and which serve for the infeed and outfeed of the operating medium lead via the sealing sleeve members'2l into the pivotable head member 9, from which location the further conveying of the operating medium takes place through the agency of nonillustrated conduits.
  • the adjustment of the pivotal body member 10 occurs at the adjustment pins 22 until reaching the momentary terminal positions 22' and 22". i
  • FIGS. 3 and 4 there is depicted the application of the teachings of the invention for a so-called double or twin axial piston unit.
  • both of the drive shafis' are combined into a single drive shaft 1', at both sides of whichthere is provided a drive plate or flange 2.
  • the fixed connection between the drive shaft 1' and the drive plate or flange 2 must be detachable.
  • the drive or power takeoff takes place via a gear 23 which meshes with a gear 24.
  • the pivot body members 10 are of the sameconstructionas in FIGS. 1 and 2, as well as the comi ponents which are mounted therein, such as the cylinders 16, the piston members 17, the piston rods 19, the guide rods 18 and. the channels 20 for the infeed and outfeed or delivery of the operating medium.
  • the pivot pins 11 in the slide or sleeve bearing means 12 of the associated pivot head 9.
  • the pivot heads 9 are constructed as double heads which are threadably connected to the support body 5 by means of the screws'l3 or equivalent structure and at each end receive a pivot pin means 11.
  • the sealing sleeve means 21 For the purpose of sealing the channels 20-with respect to the channels locatedin the pivot head .9 there is-provided the sealing sleeve means 21.
  • the channel25 which serves for balancing the pressure of both units can also be-enlarged in order to lead the channels 20 together and then to connect them via a single pipe stud or flange to the further conduits. It is not necessary to take into consideration theaxial forces in order to secure a pivot head 9 at the support body 5, since such axial forces are absorbed by the pivot head 9.
  • the screws 13 and the fitting pins 15, in this case, serve for the mutual positional fixing and stiffening of the support body 5.
  • the adjustment of the pivot or pivotal body 10 takes place at the adjustment pins 22 until reaching the terminal positions 22' and 22".
  • the advantage of the invention with respect to the known axial piston units resides in the fact that the pivot head is con- I nected with frictional contact with the support body, which approaches a construction formed of one piece. Additionally, the combining of the bracket constructions with the pivot head into a single body results in a simplification of the mounting of the unit in a manner which was not heretofore known since the pivothead can be completely removed. Furthermore, owing to the absence of the separation or partition surfaces the pivot head can be constructed to-be much stronger, for which reason larger operating pressures can be employed.
  • the pivot head additionally will be recognized as defining a combined pivot pin or trunnion accommodating and supportinghead means wherein the pivot pin accommodating recess means thereof provide bearing seating means for the pins.
  • the pivot head which in contrast to the previous constructions not only serves for the conveying of the operating medium in a suitable direction but rather also for transmitting or absorbing the flow of forces, also exhibits sufficiently large wall thicknesses which enable the provision of further channels, similar to the equilibrium or balancing channel 25 shown in FIGS. 3 and 4, for instance for the purpose of lubricating the bearings and the gears or for control and regulation purposes.
  • An axial piston unit of the type having an inclined axis comprising a support body means, a pivotal body means, pivot pin means rigid with said pivotal body means for mounting said pivotal body means to tilt relative to said support body means, combined pivot pin accommodating and supporting head means having pivot pin accommodating recess means therein providing bearing seat means for said pivot pin means and a supporting surface area facing said support body means, said support body means having a supporting surface area facing said last mentioned supporting surface area, and means for detachably connecting said supporting head means with said support body means through the provision of a frictional contact connection between said supporting surface areas.
  • An axial piston unit as defined in claim 3, wherein said means for increasing the coefficient of friction comprises an adhesive material.
  • An axial piston unit as defined in claim I further including a common drive shaft means, said pivotal body means comprising two pivotal body members operable by said common drive shaft means, said pivotal head means being common to said two pivotal body members, said two pivotal body members each being provided with two oppositely situated pivot pin means which are mounted in said common pivotal head means.
  • An axial piston unit of the type having an inclined axis comprising a support body means, a pivotal means, trunnion means extending outwardly of said pivotal means, said trunnion means being rigid with said pivotal means and constituting an axis about which said pivotal means can tilt relative to said support body means, combined trunnion accommodating and supporting head means having trunnion-accommodating recess means providing bearing seat means for rotatably receiving said trunnion means, said combined trunnion accommodating and supporting head means having bore means therethrough and a contacting surface area surrounding said bore means and facing said support body means, said support body means having thr'eaded bore means therein and a contacting surface area surrounding said threaded bore means and facing said first mentioned surface area, anadhesive material between said surface areas and headed screw means releasably accommodated in said bore means and threaded bore means so as to provide a releasable connection between said combined combined

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Reciprocating Pumps (AREA)
US734152A 1967-06-14 1968-06-03 Axial piston unit Expired - Lifetime US3545340A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH839067A CH462630A (de) 1967-06-14 1967-06-14 Axialkolbeneinheit

Publications (1)

Publication Number Publication Date
US3545340A true US3545340A (en) 1970-12-08

Family

ID=4339586

Family Applications (1)

Application Number Title Priority Date Filing Date
US734152A Expired - Lifetime US3545340A (en) 1967-06-14 1968-06-03 Axial piston unit

Country Status (8)

Country Link
US (1) US3545340A (enExample)
AT (1) AT284578B (enExample)
CH (1) CH462630A (enExample)
DE (1) DE1750614A1 (enExample)
FR (1) FR1571623A (enExample)
GB (1) GB1234453A (enExample)
NL (1) NL6808272A (enExample)
SE (1) SE347320B (enExample)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3789740A (en) * 1970-03-20 1974-02-05 J Boyer Rotary device with adjustable axial bearing

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3789740A (en) * 1970-03-20 1974-02-05 J Boyer Rotary device with adjustable axial bearing

Also Published As

Publication number Publication date
SE347320B (enExample) 1972-07-31
DE1750614A1 (de) 1971-10-07
GB1234453A (enExample) 1971-06-03
AT284578B (de) 1970-09-25
FR1571623A (enExample) 1969-06-20
NL6808272A (enExample) 1968-12-16
CH462630A (de) 1968-09-15

Similar Documents

Publication Publication Date Title
US2347663A (en) Hydraulically balanced bearing
US20080098732A1 (en) Hydraulic differential for integrated drive generator
US11383683B2 (en) Pressure generating device for a braking system of a vehicle
US4922739A (en) Roller milling tool unit for a milling machine tool
US10632813B2 (en) Adjustable spring support
CA2178480A1 (en) Continuously variable hydrostatic transmission
JPH0345234B2 (enExample)
ITRM950568A1 (it) Pompa a mandata variabile comprendente un sistema di regolazione a fuoriuscita di fluido
EP0253852A1 (en) Hydraulic rotary actuator utilizing rotation generated centrifugal head
US3545340A (en) Axial piston unit
US4014628A (en) Supercharged three-section pump
CA2377861C (en) Dual high pressure rotary union for mechanical power press
US5901643A (en) High pressure rotary union for mechanical power press
CN106975937A (zh) 液压刹车前置式回转工作台及其制动控制方法
US4464979A (en) Drive flange swash plate machines
CN111315984B (zh) 可变冲程泵
US20250163978A1 (en) Hydrostatic Rotary Machine with Optimized Brake
US3630026A (en) Hydraulic pumps and motors
US3690398A (en) Hydrostatic drive
US5462364A (en) Variable speed fluid bearing and method of use
JPS58185984A (ja) 液圧軸流ピストン機械
US3393947A (en) Two-directional axial thrust balancer
EP0235467B1 (en) Rotary fluid energy converter
US2381741A (en) Pump or motor unit
US3073253A (en) Lubrication system