US20190055931A1 - Hydraulic rotary machine - Google Patents

Hydraulic rotary machine Download PDF

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Publication number
US20190055931A1
US20190055931A1 US15/760,388 US201615760388A US2019055931A1 US 20190055931 A1 US20190055931 A1 US 20190055931A1 US 201615760388 A US201615760388 A US 201615760388A US 2019055931 A1 US2019055931 A1 US 2019055931A1
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US
United States
Prior art keywords
piston
shoe
slide
swash
plate
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.)
Abandoned
Application number
US15/760,388
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English (en)
Inventor
Ryunosuke ISHIKAWA
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.)
KYB Corp
Original Assignee
KYB Corp
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 KYB Corp filed Critical KYB Corp
Assigned to KYB CORPORATION reassignment KYB CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ISHIKAWA, Ryunosuke
Publication of US20190055931A1 publication Critical patent/US20190055931A1/en
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/20—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/20—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
    • F04B1/2014—Details or component parts
    • F04B1/2078—Swash plates
    • 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
    • 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
    • F03C1/0602—Component parts, details
    • F03C1/0605—Adaptations of pistons
    • 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
    • F03C1/0636—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 rotary cylinder block
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/122—Details or component parts, e.g. valves, sealings or lubrication means
    • F04B1/124—Pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/122—Details or component parts, e.g. valves, sealings or lubrication means
    • F04B1/124—Pistons
    • F04B1/126—Piston shoe retaining means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/20—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block
    • F04B1/22—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having 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

Definitions

  • the present invention relates to a hydraulic rotary machine.
  • JP2005-220787A discloses an axial piston pump/motor including a slipper sliding on a swash plate, a cylinder block having a plurality of cylinder bores, and a plurality of pistons reciprocating in the cylinder bores.
  • a piston is connected to one end of a connecting rod through a resin layer, while a slipper is connected to the other end through the resin layer.
  • a slide portion made of resin mounted on a portion in sliding contact with a shoe (slipper) is generally formed by mold-forming a resin on a shoe body portion and then, by cutting the molded resin.
  • a slide portion in forming the slide portion as above, when the resin is machined by a large machining force, there is a concern that the slide portion and the shoe body portion make relative rotation.
  • the present invention has an object to improve durability of the shoe in the hydraulic rotary machine.
  • a hydraulic rotary machine includes a cylinder block to which a shaft is connected, the cylinder block being configured to be rotated with the shaft; a plurality of cylinders formed on the cylinder block, the plurality of cylinders being disposed at a predetermined interval in a circumferential direction of the shaft; a piston slidably inserted into the cylinder, the piston defining a volume chamber inside the cylinder; a shoe rotatably connected to a tip end portion of the piston, the shoe being in sliding contact with the tip end portion; and a swash plate with which the shoe is in sliding contact.
  • the shoe has a slide portion made of resin provided on at least either one of a portion in sliding contact with the piston and a portion in sliding contact with the swash plate; a shoe body portion on which the slide portion is mounted; and a lock portion provided across the shoe body portion and the slide portion, the lock portion regulating relative rotation between the shoe body portion and the slide portion.
  • the lock portion has a dent portion formed on either one of the shoe body portion and the slide portion; and a projecting portion formed on the other of the shoe body portion and the slide portion, the projecting portion being locked by the dent portion.
  • FIG. 1 is a sectional view of a hydraulic rotary machine according to an embodiment of the present invention
  • FIG. 2 is an enlarged sectional view of a shoe of the hydraulic rotary machine according to the embodiment of the present invention
  • FIG. 3 is a sectional view along A-A line in FIG. 2 ;
  • FIG. 4 is a sectional view along B-B line in FIG. 2 ;
  • FIG. 5 is a sectional view illustrating a procedure of a manufacturing method of the shoe and illustrates a state where a swash-plate slide portion is provided on a core member;
  • FIG. 6 is a sectional view illustrating a procedure of the manufacturing method of the shoe and illustrates a state where a resin is filled in a recess portion of the core member
  • FIG. 7 is a sectional view illustrating a procedure of the manufacturing method of the shoe and illustrates a state where a reduced-diameter portion is formed in the shoe.
  • FIGS. 1 to 4 a hydraulic rotary machine according to the embodiment of the present invention will be described.
  • the water-pressure rotary machine 100 functions as a piston pump capable of supplying water as the operating fluid when a shaft 1 is rotated by power from an outside and a piston 6 is reciprocated and also functions as a piston motor capable of outputting a rotary driving force when the piston 6 is reciprocated by a fluid pressure of the water supplied from the outside and the shaft 1 is rotated.
  • the water-pressure rotary machine 100 may function only as a piston pump or may function only as a piston motor.
  • the water-pressure rotary machine 100 is used as a piston pump is exemplified, and the water-pressure rotary machine 100 is called a “piston pump 100 ”.
  • the piston pump 100 includes the shaft 1 rotated by a power source, a cylinder block 2 connected to the shaft 1 and rotated with the shaft 1 , and a case 3 accommodating the cylinder block 2 .
  • the case 3 includes a case body 3 a whose both ends are open, a front cover 4 sealing one of opening ends of the case body 3 a and through which the shaft 1 is inserted, and an end cover 5 sealing the other opening end of the case body 3 a and accommodating an end portion of the shaft 1 .
  • the power source is connected to one end portion la of the shaft 1 protruding to the outside through an insertion hole 43 a of the front cover 4 .
  • the end portion la of the shaft 1 is rotatably supported by the insertion hole 4 a of the front cover 4 through a first bush 16 .
  • the other end portion 1 b of the shaft 1 is accommodated in an accommodating recess portion 5 a provided on the end cover 5 and is rotatably supported through a second bush 17 .
  • the cylinder block 2 has a through hole 2 a through which the shaft 1 penetrates and is spline-coupled with the shaft 1 through the through hole 2 a. As a result, the cylinder block 2 is rotated with rotation of the shaft 1 .
  • the cylinder block 2 is rotatably supported by the case 3 through a slide bearing 15 .
  • a plurality of cylinders 2 b each having an opening portion on one end surface is formed in parallel with the shaft 1 .
  • the plurality of cylinders 2 b is formed at a predetermined interval in a circumferential direction of the cylinder block 2 .
  • the columnar piston 6 dividing a volume chamber 7 is inserted capable of reciprocating. A tip end side of the piston 6 protrudes from the opening portion of the cylinder 2 b, and a spherical surface seat 6 a is formed on the tip end portion.
  • the piston pump 100 further includes a shoe 20 rotatably connected to the spherical surface seat 6 a of the piston 6 and in sliding contact with the spherical surface seat 6 a, a swash plate 8 with which the shoe 20 is in sliding contact with rotation of the cylinder block 2 , and a valve plate 9 interposed between the cylinder block 2 and the end cover 5 .
  • the shoe 20 has a slide portion made of a resin and a shoe body portion 21 made of metal.
  • the shoe body portion 21 has, as illustrated in FIG. 2 , a receiving portion 22 for receiving the spherical surface seat 6 a of each of the pistons 6 and a disc-shaped flat plate portion 25 having an outer diameter larger than the receiving portion 22 .
  • the receiving portion 22 has a body portion 23 formed having a cylindrical shape and a reduced-diameter portion 24 whose diameter is reduced from the body portion 23 .
  • the reduced-diameter portion 24 is formed by drawing (caulking) one end portion of the body portion 23 from an outer side in a radial direction.
  • the other end portion of the body portion 23 is connected to the flat plate portion 25 .
  • a recess portion 22 a having an opening portion 22 b on an end surface is formed across the body portion 23 and the reduced-diameter portion 24 .
  • an inner peripheral surface is formed having a spherical surface shape, and a piston slide portion 30 as a slide portion is provided on an inner side of the recess portion 22 a.
  • the piston slide portion 30 is formed by mold-forming a resin in the recess portion 22 a of the receiving portion 22 .
  • the receiving portion 22 receives the spherical surface seat 6 a of the piston 6 through the piston slide portion 30 and is in sliding contact with an outer surface of the spherical surface seat 6 a.
  • the shoe 20 is capable of angular displacement with respect to the spherical surface seat 6 a.
  • the recess portion 22 a is formed so that an opening diameter of the opening portion 22 b is smaller than an outer diameter of the spherical surface seat 6 a with formation of the reduced-diameter portion 24 by reducing the diameter of one end portion of the body portion 23 in a state where the spherical surface seat 6 a of the piston 6 is inserted inside.
  • removal of the spherical surface seat 6 a from the recess portion 22 a is regulated.
  • the flat plate portion 25 is formed having a disc shape having a circular flat surface 25 a and an outer peripheral surface 25 b having a cylindrical surface shape and is faced with the swash plate 8 (see FIG. 1 ).
  • a swash-plate slide portion 31 as a slide portion is provided so as to cover the flat surface 25 a and the outer peripheral surface 25 b.
  • the swash-plate slide portion 31 is formed by mold-forming the resin on the flat plate portion 25 .
  • the flat plate portion 25 is in sliding contact with the swash plate 8 through the swash-plate slide portion 31 .
  • the slide portion is provided on a portion where the shoe 20 is in sliding contact with another member. That is, the shoe 20 has the piston slide portion 30 provided on the inner side of the recess portion 22 a of the receiving portion 22 which is the portion where the shoe 20 is in sliding contact with the spherical surface seat 6 a of the piston 6 and in sliding contact with the spherical surface seat 6 a of the piston 6 , and the swash-plate slide portion 31 provided on the flat plate portion 25 of the shoe body portion 21 which is a portion where the shoe 20 is in sliding contact with the swash plate 8 and in sliding contact with the swash plate 8 , as the slide portion.
  • the shoe 20 further has a first lock portion 40 provided across the receiving portion 22 and the piston slide portion 30 and a second lock portion 50 provided across the flat plate portion 25 and the swash-plate slide portion 31 .
  • the first lock portion 40 has a first dent portion 41 formed on an inner surface of the body portion 23 of the receiving portion 22 and a first projecting portion 42 provided on the piston slide portion 30 and locked by the first dent portion 41 . That is, the first lock portion 40 is provided across the body portion 23 of the receiving portion 22 and the piston slide portion 30 .
  • the first lock portion 40 is provided, as illustrated in FIG. 3 , at four spots at an equal interval in the circumferential direction across the receiving portion 22 and the piston slide portion 30 .
  • the first dent portion 41 does not have a right-angled corner part but is formed only by a curved surface as illustrated in FIGS. 2 and 3 .
  • the first projecting portion 42 is formed integrally with the piston slide portion 30 by mold-forming. By filling a part of the mold resin in the first dent portion 41 formed in the body portion 23 of the receiving portion 22 , the first projecting portion 42 locked by the first dent portion 41 is formed on the piston slide portion 30 . As a result, relative rotation between the shoe body portion 21 and the piston slide portion 30 is regulated.
  • the second lock portion 50 has, as illustrated in FIG. 2 , a second dent portion 51 formed on the outer peripheral surface 25 b of the flat plate portion 25 and a second projecting portion 52 formed on the swash-plate slide portion 31 and locked by the second dent portion 51 .
  • the second lock portion 50 is, as illustrated in FIG. 4 , provided at four spots at an equal interval in the circumferential direction across the flat plate portion 25 and the swash-plate slide portion 31 .
  • the second dent portion 51 does not have a right-angled corner part but is formed only by a curved surface similarly to the first dent portion 41 .
  • the second projecting portion 52 is formed integrally with the swash-plate slide portion 31 by mold-forming.
  • the second projecting portion 52 locked by the second dent portion 51 is formed on the swash-plate slide portion 31 .
  • relative rotation between the shoe body portion 21 and the swash-plate slide portion 31 is regulated, and removal of the swash-plate slide portion 31 from the flat plate portion 25 is prevented.
  • the second dent portion 51 is formed on the flat surface 25 a faced with the swash plate 8 , thermal deformation when the molded resin is cooled becomes uneven, and there is a concern that surface accuracy of a sliding surface of the swash-plate slide portion 31 lowers.
  • the second dent portion 51 is not formed on the flat surface 25 a but is formed on the outer peripheral surface 25 b, there is no concern that the surface accuracy of the sliding surface lowers.
  • the swash plate 8 is fixed to an inner wall of the front cover 4 and has a sliding contact surface 8 a inclined from a direction perpendicular to an axis of the shaft 1 .
  • the swash-plate slide portion 31 provided on the flat plate portion 25 of the shoe 20 is in surface contact with the sliding contact surface 8 a.
  • the valve plate 9 is a disc member with which a base end surface of the cylinder block 2 is in sliding contact and is fixed to the end cover 5 .
  • a suction port 9 a connecting a suction passage 10 formed in the end cover 5 and the volume chamber 7 and an ejection port 9 b connecting an ejection passage 11 formed in the end cover 5 and the volume chamber 7 are formed.
  • a core member 120 having the flat plate portion 25 and the body portion 23 is formed, and the swash-plate slide portion 31 is formed on the core member 120 .
  • the reduced-diameter portion 24 is not formed on the end portion of the body portion 23 .
  • the resin is mold-formed on the flat plate portion 25 .
  • a part of the mold resin is filled in the second dent portion 51 , and the second lock portion 50 is formed at the same time. Since the second dent portion 51 of the second lock portion 50 does not have a right-angled corner part, the mold resin is filled in the second dent portion 51 easily, and the second projecting portion 52 can be formed easily.
  • the second dent portion 51 does not have a right-angled corner part, a right-angled corner part is not formed on the second projecting portion 52 , either. Thus, stress concentration on the corner part is prevented, and durability of the second dent portion 51 and the second projecting portion 52 is improved.
  • the piston slide portion 30 is formed on the inner side of the recess portion 22 a of the receiving portion 22 .
  • the resin is filled in the entire recess portion 22 a.
  • a part of the mold resin is filled in the first dent portion 41 , and the first lock portion 40 is formed. Since the first dent portion 41 does not have a right-angled corner part similarly to the second dent portion 51 , the first projecting portion 42 can be formed easily, and durability of the first dent portion 41 and the first projecting portion 42 can be improved.
  • the filled mold resin is cut/machined so as to form a sliding contact surface having a spherical surface shape in sliding contact with the spherical surface seat 6 a of the piston 6 .
  • the relative rotation between the mold resin and the core member 120 in the recess portion 22 a is regulated by the first lock portion 40 .
  • wear of the piston slide portion 30 in the manufacture of the shoe 20 is prevented.
  • the spherical surface seat 6 a of the piston 6 is inserted into the recess portion 22 a, and the end portion (left end portion in the figure) in the body portion 23 on the opening portion 22 b side is drawn with the piston slide portion 30 from the outer side in the radial direction, and its diameter is reduced (see an arrow in FIG. 7 ).
  • the opening diameter of the opening portion 22 b of the recess portion 22 a is formed smaller than the outer diameter of the spherical surface seat 6 a of the piston 6 , whereby removal of the spherical surface seat 6 a from the recess portion 22 a is regulated.
  • the receiving portion 22 having the reduced-diameter portion 24 and the body portion 23 is formed, and the shoe 20 as illustrated in FIG. 2 is manufactured, and the shoe 20 and the piston 6 are connected to each other.
  • the first lock portion 40 when the reduced-diameter portion 24 is formed, the first projecting portion 42 has its diameter reduced together with a part of the body portion 23 and is deformed.
  • the first projecting portion 42 is deformed as above, a crack or the like occurs, and there is a concern that durability of the first projecting portion 42 lowers.
  • the piston pump 100 since the first lock portion 40 is provided across the piston slide portion 30 and the body portion 23 of the receiving portion 22 , it is not deformed when the reduced-diameter portion 24 is formed. Thus, lowering of the durability of the first projecting portion 42 can be prevented.
  • each piston 6 reciprocates in the cylinder 2 b with a stroke amount according to an inclination angle of the swash plate 8 .
  • the volume of each volume chamber 7 is increased/decreased.
  • the shoe 20 is rotated around the shaft 1 while in sliding contact with the swash plate 8 through the swash-plate slide portion 31 .
  • the second lock portion 50 since the second lock portion 50 is provided, the relative rotation between the swash-plate slide portion 31 and the flat plate portion 25 caused by the sliding resistance with the swash plate 8 is regulated.
  • wear of the swash-plate slide portion 31 caused by the relative rotation between the swash-plate slide portion 31 and the shoe body portion 21 is also prevented.
  • the relative rotation between the piston slide portion 30 and the receiving portion 22 of the shoe body portion 21 in the forming of the piston slide portion 30 and in the operation of the piston pump 100 is regulated by the first lock portion 40 .
  • the relative rotation of the piston slide portion 30 with respect to the shoe body portion 21 and the wear thereof are prevented. Therefore, removal of the piston slide portion 30 from the shoe body portion 21 is sufficiently prevented, and durability of the shoe 20 can be improved.
  • the relative rotation between the swash-plate slide portion 31 and the flat plate portion 25 of the shoe body portion 21 in the forming of the swash-plate slide portion 31 and in the operation of the piston pump 100 is regulated by the second lock portion 50 .
  • the relative rotation of the swash-plate slide portion 31 with respect to the shoe body portion 21 and the wear thereof are prevented. Therefore, removal of swash-plate slide portion 31 from the shoe body portion 21 is sufficiently prevented, and durability of the shoe 20 can be further improved.
  • first dent portion 41 of the first lock portion 40 and the second dent portion 51 of the second lock portion 50 are formed on the receiving portion 22 and the flat plate portion 25 of the shoe body portion 21 , respectively.
  • the first projecting portion 42 and the second projecting portion 52 are formed.
  • the first lock portion 40 and the second lock portion 50 can be formed easily.
  • first dent portion 41 of the first lock portion 40 and the second dent portion 51 of the second lock portion 50 are formed only by curved surfaces, respectively. Since the first dent portion 41 and the second dent portion 51 do not have corner parts at a right angle, the resin can be filled easily, and the first projecting portion 42 and the second projecting portion 52 can be formed easily. Thus, productivity can be improved. Moreover, since the first dent portion 41 and the second dent portion 51 do not have corner parts at a right angle, stress concentration on the corner part is prevented, whereby durability of the first lock portion 40 and the second lock portion 50 can be improved. Moreover, since resin can be filled easily, air bubbles are prevented from remaining in the resin, whereby durability of the first lock portion 40 and the second lock portion 50 can be further improved.
  • the piston pump/motor 100 using water as the operating liquid has been described.
  • the operating liquid may be an operating oil or other substances.
  • the piston pump/motor 100 may be a variable volume piston pump/motor in which an inclination angle of the swash plate 8 can be changed.
  • the shoe 20 has the piston slide portion 30 and the swash-plate slide portion 31 as slide portions.
  • the shoe 20 is not limited to those having both the piston slide portion 30 and the swash-plate slide portion 31 but may be those having only either one of them.
  • the first dent portion 41 and the second dent portion 51 are formed only by curved surfaces.
  • the first dent portion 41 and the second dent portion 51 may be formed having an arbitrary shape as long as it is a shape not having a right-angled corner part such as a chamfered (taper chamfering, R-chamfering or the like) shape, for example.
  • the resin can be filled in the first dent portion 41 and the second dent portion 51 easily, and stress concentration can be prevented.
  • first dent portion 41 and the second dent portion 51 do not have a right-angled corner part, but they may have a shape having a right-angled corner part if there is no concern of damage caused by stress concentration on the first lock portion 40 and the second lock portion 50 or when the resin can be filled sufficiently.
  • the second lock portion 50 has the second dent portion 51 formed on the outer peripheral surface 25 b of the flat plate portion 25 .
  • the second lock portion 50 may have notch-shaped dent opened in the outer peripheral surface 25 b of the flat plate portion 25 and a flange surface 25 c (see FIG. 2 ) on a side opposite to the flat surface 25 a in the flat plate portion 25 .
  • the second projecting portion 52 of the second lock portion 50 is formed having a shape corresponding to the shape of the dent and is locked by the dent.
  • the first dent portion 41 and the second dent portion 51 are provided on the shoe body 21
  • the first projecting portion 42 and the second projecting portion 52 are provided on the piston slide portion 30 and the swash-plate slide portion 31 , respectively.
  • the first dent portion 41 and the second dent portion 51 may be provided on the piston slide portion 30 and the swash-plate slide portion 31 , respectively
  • the first projecting portion 42 and the second projecting portion 52 may be provided on the shoe body 21 .
  • the piston pump/motor 100 includes the cylinder block 2 to which the shaft 1 is connected and rotated with the shaft 1 , the plurality of cylinders 2 b formed on the cylinder block 2 and disposed at a predetermined interval in the circumferential direction of the shaft 1 , the piston 6 slidably inserted into the cylinder 2 b and defining the volume chamber 7 inside the cylinder 2 b, the shoe 20 rotatably connected to the tip end portion of the piston 6 and in sliding contact with the tip end portion, and the swash plate 8 with which the shoe 20 is in sliding contact.
  • the shoe 20 has the slide portion (the piston slide portion 30 , the swash-plate slide portion 31 ) made of resin provided on at least either one of the portion in sliding contact with the piston 6 and the portion in sliding contact with the swash plate 8 , the shoe body portion 21 on which the slide portion (the piston slide portion 30 , the swash-plate slide portion 31 ) is mounted, and the lock portion (the first lock portion 40 , the second lock portion 50 ) provided across the shoe body portion 21 and the slide portion (the piston slide portion 30 , the swash-plate slide portion 31 ) and regulating the relative rotation between the shoe body portion 21 and the slide portion (the piston slide portion 30 , the swash-plate slide portion 31 ).
  • the lock portion (the first lock portion 40 , the second lock portion 50 ) has the dent portion (the first dent portion 41 , the second dent portion 51 ) formed on either one of the shoe body portion 21 and the slide portion (the piston slide portion 30 , the swash-plate slide portion 31 ) and the projecting portion (the first projecting portion 42 , the second projecting portion 52 ) formed on the other of the shoe body portion 21 and the slide portion and locked by the dent portion (the first dent portion 41 , the second dent portion 51 ).
  • the relative rotation between the shoe body portion 21 and the slide portion (the piston slide portion 30 , the swash-plate slide portion 31 ) is regulated by the lock portion (the first lock portion 40 , the second lock portion 50 ), the wear of the slide portion (the piston slide portion 30 , the swash-plate slide portion 31 ) in machining and the wear of the slide portion (the piston slide portion 30 , the swash-plate slide portion 31 ) in the operation of the piston pump/motor 100 are both prevented. Therefore, the durability of the shoe 20 in the piston pump/motor 100 is improved.
  • the piston 6 has the spherical surface seat 6 a formed on the tip end portion
  • the shoe body portion 21 has the receiving portion 22 receiving the spherical surface seat 6 a of the piston 6
  • the receiving portion 22 has the body portion 23 and the reduced-diameter portion 24 whose diameter is reduced from the body portion 23 and regulating removal of the spherical surface seat 6 a from the receiving portion 22
  • the shoe 20 has the piston slide portion 30 as the slide portion provided on the inner periphery of the receiving portion 22 and in sliding contact with the spherical surface seat 6 a of the piston 6
  • the first lock portion 40 is provided across the body portion 23 of the receiving portion 22 and the piston slide portion 30 .
  • the piston slide portion 30 is provided on the inner periphery of the receiving portion 22 with which the shoe 20 and the piston 6 are in sliding contact.
  • the first lock portion 40 is provided across the piston slide portion 30 and the body portion 23 of the receiving portion 22 and regulates the relative rotation between the piston slide portion 30 and the shoe body portion 21 .
  • the first lock portion 40 is provided on the body portion 23 instead of the reduced-diameter portion 24 , when the reduced-diameter portion 24 is to be formed by reducing the diameter of a part of the body portion 23 , the first lock portion 40 is not deformed. Thus, lowering of durability of the first lock portion 40 can be prevented.
  • the shoe body portion 21 has the flat plate portion 25 formed having a disc shape and faced with the swash plate 8
  • the shoe 20 has the swash-plate slide portion 31 as the slide portion provided on the flat plate portion 25 so as to cover the outer peripheral surface 25 b of the flat plate portion 25 and in sliding contact with the swash plate 8
  • the second lock portion 50 is provided across the outer peripheral surface 25 b of the flat plate portion 25 and the swash-plate slide portion 31 .
  • the swash-plate slide portion 31 is provided on the flat plate portion 25 with which the shoe 20 and the swash plate 8 are in sliding contact.
  • the second lock portion 50 is provided across the swash-plate slide portion 31 and the outer peripheral surface 25 b of the flat plate portion 25 .
  • the projecting portion (the first projecting portion 42 , the second projecting portion 52 ) is provided on the slide portion (the piston slide portion 30 , the swash-plate slide portion 31 ), and the dent portion (the first dent portion 41 , the second dent portion 51 ) is provided on the shoe body portion 21 .
  • the projecting portion (the first projecting portion 42 , the second projecting portion 52 ) can be formed. Therefore, the projecting portion (the first projecting portion 42 , the second projecting portion 52 ) can be formed more easily than the case where the projecting portion (the first projecting portion 42 , the second projecting portion 52 ) is provided by machining the shoe body portion 21 .
  • the dent portion (the first dent portion 41 , the second dent portion 51 ) is formed by a curved surface.
  • the resin can be filled in the dent portion (the first dent portion 41 , the second dent portion 51 ) easily, and stress concentration on the corner part is prevented, whereby durability of the dent portion (the first dent portion 41 , the second dent portion 51 ) and the projecting portion (the first projecting portion 42 , the second projecting portion 52 ) can be improved.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Reciprocating Pumps (AREA)
  • Hydraulic Motors (AREA)
US15/760,388 2015-09-16 2016-09-14 Hydraulic rotary machine Abandoned US20190055931A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2015183222A JP6622533B2 (ja) 2015-09-16 2015-09-16 液圧回転機
JP2015-183222 2015-09-16
PCT/JP2016/077190 WO2017047668A1 (ja) 2015-09-16 2016-09-14 液圧回転機

Publications (1)

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US20190055931A1 true US20190055931A1 (en) 2019-02-21

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US15/760,388 Abandoned US20190055931A1 (en) 2015-09-16 2016-09-14 Hydraulic rotary machine

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US (1) US20190055931A1 (ja)
EP (1) EP3351794A1 (ja)
JP (1) JP6622533B2 (ja)
CN (1) CN108026905A (ja)
WO (1) WO2017047668A1 (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021126828A1 (en) * 2019-12-16 2021-06-24 Ocean Pacific Technologies Rotary axial piston pumps and components with ceramic sliding surface interfaces

Citations (2)

* Cited by examiner, † Cited by third party
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US4261250A (en) * 1975-07-02 1981-04-14 Danfoss A/S Slide shoe arrangement, particularly for axial and radial piston machines
US5762477A (en) * 1994-07-13 1998-06-09 Danfoss A/S Piston/slide shoe arrangement

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JP2001009160A (ja) * 1999-06-30 2001-01-16 Aruze Corp 操作レバーおよび操作レバーの製造方法
JP4025832B2 (ja) * 2003-04-14 2007-12-26 株式会社豊田自動織機 圧縮機
JP4049082B2 (ja) * 2003-06-19 2008-02-20 株式会社豊田自動織機 圧縮機
JP2005220787A (ja) * 2004-02-04 2005-08-18 Ebara Corp アキシアルピストンポンプ又はモータ
JP2009121635A (ja) * 2007-11-16 2009-06-04 Mitsubishi Fuso Truck & Bus Corp ボルト又はナットの樹脂鋳込み構造
JP5594466B2 (ja) * 2010-07-28 2014-09-24 大豊工業株式会社 斜板式コンプレッサ
JP2012180785A (ja) * 2011-03-01 2012-09-20 Thk Co Ltd ピストンシュー
JP5826508B2 (ja) * 2011-04-14 2015-12-02 日本発條株式会社 スタビリンクの製造方法
JP6031301B2 (ja) * 2012-09-10 2016-11-24 Ｋｙｂ株式会社 水圧回転機
JP6230803B2 (ja) * 2013-04-10 2017-11-15 Ntn株式会社 斜板式コンプレッサの半球シューおよび斜板式コンプレッサ
CN104454504A (zh) * 2014-11-26 2015-03-25 常州飞宇化工有限公司 一种耐磨的轴向柱塞泵的柱塞滑履

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4261250A (en) * 1975-07-02 1981-04-14 Danfoss A/S Slide shoe arrangement, particularly for axial and radial piston machines
US5762477A (en) * 1994-07-13 1998-06-09 Danfoss A/S Piston/slide shoe arrangement

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021126828A1 (en) * 2019-12-16 2021-06-24 Ocean Pacific Technologies Rotary axial piston pumps and components with ceramic sliding surface interfaces

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JP6622533B2 (ja) 2019-12-18
CN108026905A (zh) 2018-05-11
WO2017047668A1 (ja) 2017-03-23
EP3351794A1 (en) 2018-07-25
JP2017057791A (ja) 2017-03-23

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