EP2159411A1 - Piston-type rotator - Google Patents

Piston-type rotator Download PDF

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Publication number
EP2159411A1
EP2159411A1 EP08015251A EP08015251A EP2159411A1 EP 2159411 A1 EP2159411 A1 EP 2159411A1 EP 08015251 A EP08015251 A EP 08015251A EP 08015251 A EP08015251 A EP 08015251A EP 2159411 A1 EP2159411 A1 EP 2159411A1
Authority
EP
European Patent Office
Prior art keywords
rotator
piston
cylinder assembly
hydraulic
pistons
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.)
Granted
Application number
EP08015251A
Other languages
German (de)
French (fr)
Other versions
EP2159411B1 (en
Inventor
Vilis Darznieks
Andris Martinsons
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.)
BALTROTORS SIA
Original Assignee
BALTROTORS SIA
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 BALTROTORS SIA filed Critical BALTROTORS SIA
Priority to EP08015251A priority Critical patent/EP2159411B1/en
Priority to AT08015251T priority patent/ATE513125T1/en
Publication of EP2159411A1 publication Critical patent/EP2159411A1/en
Application granted granted Critical
Publication of EP2159411B1 publication Critical patent/EP2159411B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
    • F03C1/00—Reciprocating-piston liquid engines
    • F03C1/02—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders
    • F03C1/06—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C3/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith and intended primarily for transmitting lifting forces to loose materials; Grabs
    • B66C3/005—Grab supports, e.g. articulations; Oscillation dampers; Orientation
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/36—Component parts
    • E02F3/3604—Devices to connect tools to arms, booms or the like
    • E02F3/3677—Devices to connect tools to arms, booms or the like allowing movement, e.g. rotation or translation, of the tool around or along another axis as the movement implied by the boom or arms, e.g. for tilting buckets
    • E02F3/3681—Rotators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
    • F03C1/00—Reciprocating-piston liquid engines
    • F03C1/02—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders
    • F03C1/06—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis
    • F03C1/061—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis having stationary cylinders
    • F03C1/0613—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis having stationary cylinders having two or more sets of cylinders or pistons

Definitions

  • Rotators of prior art including different models produced by BALTROTORS, SIA, LV and INDEXATOR, AB, SE, contain guided-vane hydraulic motors as rotation gears.
  • rotator of prior art of company INDEXATOR, AB is known from description to international patent application No. WO 03/082725 , MKN 7 B66C 13/08, 2003, rotator assembly of which contains a vane-type hydraulic motor with springloaded vanes that interact with the contoured inner surface of the stator.
  • An inherent drawback of the rotator of the prior art is a lack of rigid stopping moment during the rotation process, a feature crucial at construction works. In the event of load unbalance at the inclined or horizontal position of rotor axle, a spontaneous swing movement of the load becomes possible, which is unacceptable in building and construction technology.
  • the rotators of prior art are also well-known BLACK BRUIN brand radial piston-type rotators made by Sampo Hydraulics Oy, FI. Information on the analogue is available at the web site: http://www.sampo-hydraulics.com.
  • This type of rotator of prior art is mostly used in timber industry, and due to its specific design features the rotator is integrated with the suspension, therefore its connection to another suspension is impossible.
  • a circular cross-section large-diameter piston is used as the key element of the radial piston-type hydraulic motor. Use of the large-diameter piston is necessary to achieve the torque required, but it results in the rotator's increased size.
  • the object of the current invention is to develop a technologically improved embodiment of rotator with higher torque and minimised dimensions.
  • a piston-type rotator including an axial piston hydraulic motor and a block with axial openings for pistons, connecting elements for mounting it to the crane and to working appliances, a hydraulic system for actuation of working appliances and distribution of fluid within the rotator, wherein the hydraulic motor, producing rotary motion and torque, contains a static cylinder assembly with axial cylindrical openings that are provided with two pistons and springs between them and are positioned in each of the said cylindrical opening so that the pistons can move in opposite from each other direction under the force of hydraulic pressure and actuate by means of their working surface the unit revolving the outer casing interconnected with working appliances.
  • Each piston provided with the ball inserted into the ball socket of the piston is made so that it can interact with the correspondingly contoured surfaces of the upper and bottom covers which are connected by means of the spacer for revolving the outer casing interconnected with working appliances.
  • the rotator is provided with the axial bearings positioned on two sides between the cylinder assembly and the upper cover and the bottom cover so that they are capable of taking up both upward and downward-directed axial loads, at that, the sliding bearing is pressed-in into the internal diameter of the spacer taking up radial loads.
  • Fig. 1 is shown the lengthwise section of the rotator; on Fig. 2 its cross section.
  • the piston-type rotator includes the following major components: outer casing 1; cylinder assembly 2; flanged axle 3.
  • the cylinder assembly 2 comprises an assembly of block 8 with milled cylindrical openings-cylinders wherein in each of the cylindrical opening two pistons 9 and springs 11 between them are inserted so that the pistons 9 can move in opposite from each other direction under the force of hydraulic pressure and actuate by means of their working surface the unit revolving the outer casing 1 interconnected with working appliances (not shown).
  • the balls 10 are placed into the ball socket on the piston 9 surfaces opposite to the spring 11.
  • axial bearings 14 are mounted to take up axial loads from the upper and bottom covers 4; 5, whereas the spacer 6 contains pressed-in sliding bearing 15, enabling the rotation of outer casing 1 relatively to the cylinder assembly 2 and taking up radial loads.
  • the distribution valve 16 is located in the central aperture of the cylinder assembly block 8 with a minimum gap clearance that enables thermal expansion of heat generated by the hydraulic fluid.
  • Distribution valve 16 is fixed to the bottom cover 5 with a pin 17 and rotates along with the cover during normal operation.
  • the static component, connecting rotator with the crane's arm (not shown) is a flanged axle 3, attached to the cylinder assembly block 8 with axial load-bearing screws 12, and with torque-responsive pins 13.
  • One of bolts 12 has a through axial hole, connecting the inner space of casing 1 with channel 5', which serves as a drainage for outflow from the casing.
  • Seals 20 and 21 isolate the discharge ducts from the drain channels. At the end of the system there are outlets 3' and 4' to which the actuating devices' hydraulic system is connected.
  • the hydraulic fluid from the cylinders operating in drain mode travels via hydraulic channels 2" ( Fig. 2 ) to the distribution valve 16 and then on via channels 2' ( Fig. 2 ) to be drained ( Fig. 1 ).
  • the suggested rotator offers improved performance in terms of a two-fold increase in torque output while having smaller dimensions than a double-row axial piston rotator.
  • the suggested hydraulic piston rotator can be used in hydraulic cranes for actuating and rotating attachments of various pieces of machinery, whereas all of its constituent parts can be produced by industrial methods of prior art.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Hydraulic Motors (AREA)
  • Support Of The Bearing (AREA)

Abstract

The present invention relates to hydraulic rotators used in hydraulic cranes. The object is to develop a rotator with higher torque and minimised dimensions. The rotator includes an outer casing (1); cylinder assembly (2); flanged axle (3). The cylinder assembly (2) comprises an assembly of block (8) with milled cylindrical openings-cylinders wherein in each of the cylindrical opening two pistons (9) and springs (11) between them are inserted so that the pistons (9) can move in opposite from each other direction under the force of hydraulic pressure and actuate the unit revolving the outer casing (1) interconnected with working appliances. On both sides of cylinder assembly (2), axial bearings (14) are mounted to take up axial loads from upper and bottom covers (4;5), the spacer (6) contains a pressed-in sliding bearing (15), enabling the rotation of outer casing (1) relatively to the cylinder assembly (2). Pressure is directed to the distribution valve (16) via channel (1'), then via channels on to the cylinders in cylinder assembly (2). Once the pressure reaches the cylinder, pistons (9) start moving in opposite directions and actuating the balls (10). Torque is generated, as a result of tangential force, causing the rotation of outer casing (1).

Description

  • The present invention relates to the field of hydraulic devices, more specifically, to hydraulic rotators used in hydraulic cranes for actuation and rotation of working appliances, such as clamps, grab buckets, including multi-bucket grapples, excavator buckets, etc..
  • Rotators of prior art, including different models produced by BALTROTORS, SIA, LV and INDEXATOR, AB, SE, contain guided-vane hydraulic motors as rotation gears. For instance, rotator of prior art of company INDEXATOR, AB, is known from description to international patent application No. WO 03/082725 , MKN7 B66C 13/08, 2003, rotator assembly of which contains a vane-type hydraulic motor with springloaded vanes that interact with the contoured inner surface of the stator. An inherent drawback of the rotator of the prior art is a lack of rigid stopping moment during the rotation process, a feature crucial at construction works. In the event of load unbalance at the inclined or horizontal position of rotor axle, a spontaneous swing movement of the load becomes possible, which is unacceptable in building and construction technology.
  • The rotators of prior art are also well-known BLACK BRUIN brand radial piston-type rotators made by Sampo Hydraulics Oy, FI. Information on the analogue is available at the web site: http://www.sampo-hydraulics.com. This type of rotator of prior art is mostly used in timber industry, and due to its specific design features the rotator is integrated with the suspension, therefore its connection to another suspension is impossible. A circular cross-section large-diameter piston is used as the key element of the radial piston-type hydraulic motor. Use of the large-diameter piston is necessary to achieve the torque required, but it results in the rotator's increased size.
  • Most widely known are the THUMM brand piston-type rotators with both radial and axial positioning of pistons. A rotator with radial piston positioning has considerable dimensions in terms of height. First and foremost it is needed to use a double-row piston assembly, so that required torque levels can be achieved. Consequently, the overall dimensions of rotator are enlarged by the collector array with two sets of taper bearings that serve to take up both radial and axial loads.
  • The axial-piston type rotator of prior art is known from description to international patent application No. WO9626326 ( PCT/EP 96/00684 ), MKN7 B66C3/00, 1996, measures considerably less in height due to the specifically contoured parts of the rotator enabling to use their surfaces as radial and thrust bearings. However, this results in the mandatory replacement of all costly parts when the wearing of some part happens.
  • The object of the current invention is to develop a technologically improved embodiment of rotator with higher torque and minimised dimensions.
  • In conformity of invention a piston-type rotator including an axial piston hydraulic motor and a block with axial openings for pistons, connecting elements for mounting it to the crane and to working appliances, a hydraulic system for actuation of working appliances and distribution of fluid within the rotator, wherein the hydraulic motor, producing rotary motion and torque, contains a static cylinder assembly with axial cylindrical openings that are provided with two pistons and springs between them and are positioned in each of the said cylindrical opening so that the pistons can move in opposite from each other direction under the force of hydraulic pressure and actuate by means of their working surface the unit revolving the outer casing interconnected with working appliances.
  • Each piston provided with the ball inserted into the ball socket of the piston, is made so that it can interact with the correspondingly contoured surfaces of the upper and bottom covers which are connected by means of the spacer for revolving the outer casing interconnected with working appliances.
  • The rotator is provided with the axial bearings positioned on two sides between the cylinder assembly and the upper cover and the bottom cover so that they are capable of taking up both upward and downward-directed axial loads, at that, the sliding bearing is pressed-in into the internal diameter of the spacer taking up radial loads.
  • A flanged axle is attached to the cylinder assembly provided with hydraulic channels connected to an external pressure source for applying pressure to the working appliances and to the system of fluid distribution within the rotator, whereas the flanged surface of the axle is performed as an assembly point for attachment components of the rotator and the crane.
  • The invention is further illustrated by the accompanying drawings, where on Fig. 1 is shown the lengthwise section of the rotator; on Fig. 2 its cross section.
  • The piston-type rotator includes the following major components: outer casing 1; cylinder assembly 2; flanged axle 3.
  • Outer casing 1 in its turn contains: upper cover 4; bottom cover 5; spacer 6; held together by bolts 7. The internal walls of the upper and bottom covers have spheroid surfaces conforming to the shape of cylinder assembly 2.
  • The cylinder assembly 2 comprises an assembly of block 8 with milled cylindrical openings-cylinders wherein in each of the cylindrical opening two pistons 9 and springs 11 between them are inserted so that the pistons 9 can move in opposite from each other direction under the force of hydraulic pressure and actuate by means of their working surface the unit revolving the outer casing 1 interconnected with working appliances (not shown). The balls 10 are placed into the ball socket on the piston 9 surfaces opposite to the spring 11.
  • On both sides of cylinder assembly 2, axial bearings 14 are mounted to take up axial loads from the upper and bottom covers 4; 5, whereas the spacer 6 contains pressed-in sliding bearing 15, enabling the rotation of outer casing 1 relatively to the cylinder assembly 2 and taking up radial loads. The distribution valve 16 is located in the central aperture of the cylinder assembly block 8 with a minimum gap clearance that enables thermal expansion of heat generated by the hydraulic fluid.
  • Distribution valve 16 is fixed to the bottom cover 5 with a pin 17 and rotates along with the cover during normal operation.
  • The static component, connecting rotator with the crane's arm (not shown) is a flanged axle 3, attached to the cylinder assembly block 8 with axial load-bearing screws 12, and with torque-responsive pins 13. One of bolts 12 has a through axial hole, connecting the inner space of casing 1 with channel 5', which serves as a drainage for outflow from the casing.
  • Flanged axle 3 also has hydraulic channels 1'; 2' bored through it, via which supply of hydraulic fluid is directed to distribution valve 16 and either pressure supply or drainage is carried out depending on the direction of movement; likewise, in assembly block 8, hydraulic channels 1' and 2' that lead from the distribution valve to the cylinders in the cylinder assembly, are provided for the same purpose.
  • With a view to conducting the hydraulic fluid from an external pressure source to the actuating devices, hydraulic channels 3' and 4' have been provided in the flanged axle 3 and they subsequently lead on to channels 3' and 4' formed by bushings 18 and 19, inserted accordingly into the central apertures of bottom cover 5, distribution valve 16 and into that of casing of block 8.
  • Seals 20 and 21 isolate the discharge ducts from the drain channels. At the end of the system there are outlets 3' and 4' to which the actuating devices' hydraulic system is connected.
  • The piston-type rotator operates as follows. Pressure is directed to the distribution valve 16 via channel 1', then via channels in compliance with the distribution valve's certain configuration, on to the cylinders in cylinder assembly 2. In this particular case, those are channels 1' (Fig. 2). Once the pressure reaches the cylinder, pistons 9 start moving in opposite directions and actuating the balls 10, inserted into each of them, the contoured surfaces of the upper and bottom covers 4, 5, and as a consequence of the resulting tangential force, torque is generated, causing the rotation of outer casing 1 (Fig. 1).
  • Technical features of the invented rotator are characterized by that there are two pistons operating concurrently, the resulting torque is twice that generated by a single piston.
  • The hydraulic fluid from the cylinders operating in drain mode travels via hydraulic channels 2" (Fig. 2) to the distribution valve 16 and then on via channels 2' (Fig. 2) to be drained (Fig. 1).
  • Upon the alteration of a 'discharge-drain' supply of hydraulic fluid to its opposite value, the process is reversed as is the direction in which the rotator rotates.
  • The suggested rotator offers improved performance in terms of a two-fold increase in torque output while having smaller dimensions than a double-row axial piston rotator.
  • The suggested hydraulic piston rotator can be used in hydraulic cranes for actuating and rotating attachments of various pieces of machinery, whereas all of its constituent parts can be produced by industrial methods of prior art.

Claims (4)

  1. A piston-type rotator including an axial piston hydraulic motor and a block with axial openings for pistons, connecting elements for mounting it to the crane and to working appliances, a hydraulic system for actuation of working appliances and distribution of fluid within the rotator, characterised in that the hydraulic motor, producing rotary motion and torque, contains a static cylinder assembly (2) with axial cylindrical openings that are provided with two pistons (9) and springs (11) between them and are positioned in each of the said cylindrical opening so that the pistons can move in opposite from each other direction under the force of hydraulic pressure and actuate by means of their working surface the unit revolving the outer casing (1) interconnected with working appliances.
  2. A piston-type rotator according to Claim 1, characterized in that each piston (9), provided with the ball (10) inserted into the ball socket of the piston (9), is made so that it can interact with the correspondingly contoured surfaces of the upper and bottom covers (4, 5) which are connected by means of the spacer (6) for revolving the outer casing (1) interconnected with working appliances.
  3. A piston-type rotator according to Claim 1 or 2, characterized in that the rotator is provided with the axial bearings (14) positioned on two sides between the cylinder assembly (2) and the upper cover (4) and the bottom cover (5) so that they are capable of taking up both upward and downward-directed axial loads, at that, the sliding bearing (15) is pressed-in into the internal diameter of the spacer (6) taking up radial loads.
  4. A piston-type rotator according to any of preceding Claims, characterized in that a flanged axle (3) is attached to the cylinder assembly (2) provided with hydraulic channels (1', 2', 3', 4', 5') connected to an external pressure source for applying pressure to the working appliances and to the system of fluid distribution within the rotator, whereas the flanged surface of the axle (3) is performed as an assembly point for attachment components of the rotator and the crane.
EP08015251A 2008-08-29 2008-08-29 Piston-type rotator Not-in-force EP2159411B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP08015251A EP2159411B1 (en) 2008-08-29 2008-08-29 Piston-type rotator
AT08015251T ATE513125T1 (en) 2008-08-29 2008-08-29 PISTON LATHE

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08015251A EP2159411B1 (en) 2008-08-29 2008-08-29 Piston-type rotator

Publications (2)

Publication Number Publication Date
EP2159411A1 true EP2159411A1 (en) 2010-03-03
EP2159411B1 EP2159411B1 (en) 2011-06-15

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EP08015251A Not-in-force EP2159411B1 (en) 2008-08-29 2008-08-29 Piston-type rotator

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EP (1) EP2159411B1 (en)
AT (1) ATE513125T1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011128427A3 (en) * 2010-04-17 2011-12-29 Holp Gmbh Rotary device for an attachment on a machine
CN103502135A (en) * 2011-03-26 2014-01-08 因得克斯阿托尔集团股份公司 Method and apparatus relating to a rotator
WO2015155627A1 (en) * 2014-04-10 2015-10-15 Ala Officine S.P.A. Multipath fluidic rotary distributor
DE102015011255A1 (en) 2015-04-01 2016-10-06 Gunther Neumann Hydraulic motor for turning excavator work tools or the like.
CN112196751A (en) * 2020-10-07 2021-01-08 黄洪刚 Plunger pump
US11365526B2 (en) 2016-05-25 2022-06-21 Ponsse Oyj Structure of a rotation device, and a corresponding rotation device, and a forest machine

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2617360A (en) 1945-05-10 1952-11-11 Virgil D Barker Fluid displacement device
US2712794A (en) * 1949-06-15 1955-07-12 Marion W Humphreys Fluid motor or pump
US3435774A (en) 1966-12-01 1969-04-01 Benton Harbor Eng Works Inc Hydraulic pump or motor
US4086845A (en) 1975-03-14 1978-05-02 Kinzo Takagi Variable delivery hydraulic equipment
US4333676A (en) * 1978-09-02 1982-06-08 Firma Thumm Olhydraulische Antriebe GmbH Rotational mechanism for an excavator grab bucket
WO1996026326A1 (en) 1995-02-18 1996-08-29 Heinz Thumm Oelhydraulische Antriebe Gmbh Slewing mechanism for an excavator grab
WO2003082725A1 (en) 2002-04-02 2003-10-09 Indexator Ab Arrangement at a rotator

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2617360A (en) 1945-05-10 1952-11-11 Virgil D Barker Fluid displacement device
US2712794A (en) * 1949-06-15 1955-07-12 Marion W Humphreys Fluid motor or pump
US3435774A (en) 1966-12-01 1969-04-01 Benton Harbor Eng Works Inc Hydraulic pump or motor
US4086845A (en) 1975-03-14 1978-05-02 Kinzo Takagi Variable delivery hydraulic equipment
US4333676A (en) * 1978-09-02 1982-06-08 Firma Thumm Olhydraulische Antriebe GmbH Rotational mechanism for an excavator grab bucket
WO1996026326A1 (en) 1995-02-18 1996-08-29 Heinz Thumm Oelhydraulische Antriebe Gmbh Slewing mechanism for an excavator grab
WO2003082725A1 (en) 2002-04-02 2003-10-09 Indexator Ab Arrangement at a rotator

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011128427A3 (en) * 2010-04-17 2011-12-29 Holp Gmbh Rotary device for an attachment on a machine
CN103502135A (en) * 2011-03-26 2014-01-08 因得克斯阿托尔集团股份公司 Method and apparatus relating to a rotator
CN103502135B (en) * 2011-03-26 2016-01-20 因得克斯阿托尔罗塔托尔系统股份公司 Arrangement in connection with a rotator
WO2015155627A1 (en) * 2014-04-10 2015-10-15 Ala Officine S.P.A. Multipath fluidic rotary distributor
DE102015011255A1 (en) 2015-04-01 2016-10-06 Gunther Neumann Hydraulic motor for turning excavator work tools or the like.
US11365526B2 (en) 2016-05-25 2022-06-21 Ponsse Oyj Structure of a rotation device, and a corresponding rotation device, and a forest machine
CN112196751A (en) * 2020-10-07 2021-01-08 黄洪刚 Plunger pump

Also Published As

Publication number Publication date
EP2159411B1 (en) 2011-06-15
ATE513125T1 (en) 2011-07-15

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