EP3351793A1 - Hydraulic rotary machine, and valve plate for same - Google Patents

Hydraulic rotary machine, and valve plate for same Download PDF

Info

Publication number
EP3351793A1
EP3351793A1 EP16846538.3A EP16846538A EP3351793A1 EP 3351793 A1 EP3351793 A1 EP 3351793A1 EP 16846538 A EP16846538 A EP 16846538A EP 3351793 A1 EP3351793 A1 EP 3351793A1
Authority
EP
European Patent Office
Prior art keywords
contact portion
cylinder block
core member
valve plate
resin layer
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.)
Withdrawn
Application number
EP16846538.3A
Other languages
German (de)
English (en)
French (fr)
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
Publication of EP3351793A1 publication Critical patent/EP3351793A1/en
Withdrawn legal-status Critical Current

Links

Images

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
    • 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
    • F01B3/0076—Connection between cylinder barrel and inclined swash plate
    • 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
    • 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
    • F03C1/0644—Component parts
    • F03C1/0647—Particularities in the contacting area between cylinder barrel and valve plate
    • 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
    • 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
    • F04B1/2021—Details or component parts characterised by the contact area between cylinder barrel and valve plate
    • 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
    • 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
    • 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
    • F04B1/24—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 inclined to the main shaft axis
    • 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
    • F04B1/26—Control
    • F04B1/30—Control of machines or pumps with rotary cylinder blocks
    • F04B1/306—Control of machines or pumps with rotary cylinder blocks by turning the swash plate, e.g. with fixed inclination

Definitions

  • the present invention relates to a hydraulic rotary machine and a valve plate thereof.
  • JP1995-179616A discloses a swash-plate axial piston type pump including a cylinder block rotated by driving of a shaft through a spline, a piston inserted into a cylinder provided in the cylinder block in a freely reciprocating manner, a slipper provided on a base end of the piston, and a thrust plate having an inclined surface on which the slipper slides.
  • a surface of a sliding member is coated with a resin layer in order to reduce sliding resistance of the member sliding in an operation.
  • the present invention has an object to reduce the manufacturing cost of the hydraulic rotary machine.
  • a hydraulic rotary machine includes a cylinder block to which a shaft is connected so as 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 of the piston; a swash plate with which the shoe is in sliding contact; a case accommodating the cylinder block; and a valve plate formed by a core member and a resin layer coating the core member, the valve plate being provided with a supply port through which an operating liquid supplied to the volume chamber passes and a discharge port through which an operating liquid discharged from the volume chamber passes, the valve plate being interposed between the cylinder block and the case.
  • the valve plate has a sliding contact portion formed by the resin layer, the cylinder block being in sliding contact with the sliding contact portion; and a non-contact portion separated away from the cylinder block, and at least a part of the non-contact portion is an exposed portion where the core member is exposed.
  • 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 as illustrated in Fig. 1 .
  • the case 3 includes a case body 3a whose both ends are open, a front cover 4 sealing one of opening ends of the case body 3a and through which the shaft 1 is inserted, and an end cover 5 sealing the other opening end of the case body 3a and accommodating an end portion of the shaft 1.
  • the power source is connected to one end portion 1a of the shaft 1 protruding to the outside through an insertion hole 4a of the front cover 4, the power source is connected.
  • the end portion 1a of the shaft 1 is rotatably supported by the insertion hole 4a of the front cover 4 through a first bush 16.
  • the other end portion 1b of the shaft 1 is accommodated in an accommodating recess portion 5a provided on the end cover 5 and is rotatably supported through a second bush 17.
  • the cylinder block 2 has a through hole 2a through which the shaft 1 penetrates and is spline-connected with the shaft 1 through the through hole 2a. 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 2b each having an opening portion on one end surface is formed in parallel with the shaft 1.
  • the plurality of cylinders 2b 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 into the cylinder 2b to be capable of reciprocating.
  • a tip end side of the piston 6 protrudes from the opening portion of the cylinder 2b, and a spherical surface seat 6a is formed on the tip end portion.
  • the piston pump 100 further includes a shoe 8 rotatably connected to the spherical surface seat 6a of the piston 6 and in sliding contact with the spherical surface seat 6a, a swash plate 9 with which the shoe 8 is in sliding contact with rotation of the cylinder block 2, and a valve plate 20 interposed between the cylinder block 2 and the end cover 5.
  • the shoe 8 has a receiving portion 8a for receiving the spherical surface seat 6a formed on a tip end of each piston 6 and a circular flat plate portion 8b in sliding contact with the swash plate 9.
  • An inner surface of the receiving portion 8a is formed having a spherical surface shape and is in sliding contact with an outer surface of the received spherical surface seat 6a.
  • the swash plate 9 is fixed to an inner wall of the front cover 4 and has a sliding contact surface 9a inclined from a direction perpendicular to an axis of the shaft 1.
  • the flat plate portion 8b of the shoe 8 is in surface contact with the sliding contact surface 9a.
  • the valve plate 20 is a disc member formed by a core member 21 made of metal and a resin layer 22 coating the core member 21.
  • the valve plate 20 has, as illustrated in Figs. 2 and 3 , a first land portion 30 as a sliding contact portion formed by the resin layer 22 and with which the cylinder block 2 is in sliding contact, a second land portion 35 formed by the resin layer 22 and as a contact portion with which the end cover 5 of the case 3 is in contact, and a non-contact portion separated from the cylinder block 2 and the end cover 5.
  • the non-contact portion has an outer-side non-contact portion 40 provided closer to an outer side in a radial direction than the first land portion 30 and the second land portion 35 and an inner-side non-contact portion 45 provided closer to an inner side in the radial direction than the first land portion 30 and the second land portion 35.
  • Fig. 3 illustrates only the shape of the first land portion 30, and illustration of each constitution of the second land portion 35 is omitted and it is indicated in reference numerals in parentheses.
  • valve plate 20 In the valve plate 20, a supply port 20a connecting the supply passage 10 and the volume chamber 7 and allowing passage of water to be supplied to the volume chamber 7, a discharge port 20b connecting the discharge passage 11 and the volume chamber 7 and allowing passage of water discharged from the volume chamber 7, and a shaft insertion hole 20c formed at the center of the valve plate 20 and into which the shaft 1 is inserted are provided.
  • the first land portion 30 is, as illustrated in Fig. 3 , formed annularly by the resin layer 22 coating the surface of the core member 21. Since the first land portion 30 is formed by the resin layer 22, sliding resistance between the valve plate 20 and the cylinder block 2 is reduced.
  • the first land portion 30 is divided by the supply port 20a and the discharge port 20b into the first outer-side land portion 31 and a first inner-side land portion 32.
  • the first outer-side land potion 31 and the first inner-side land portion 32 are connected by a first intermediate portion 33 provided between the supply port 20a and the discharge port 20b in the circumferential direction.
  • the second land portion 35 is formed annularly by the resin layer 22 coating the surface of the core member 21 and is brought into contact with the end cover 5 of the case 3. Similarly to the first land portion 30, the second land portion 35 is divided by the supply port 20a and the discharge port 20b into a second outer-side land portion 36 and a second inner-side land portion 37. Moreover, the second outer-side land portion 36 and the second inner-side land portion 37 are connected by a second intermediate portion 38 provided between the supply port 20a and the discharge port 20b in the circumferential direction. The valve plate 20 is fixed to the end cover 5 in a state where the second land portion 35 is in contact with the end cover 5.
  • the outer-side non-contact portion 40 is, as illustrated in Fig. 2 , formed having a gap from the cylinder block 2 and is formed having a gap from the end cover 5. Thus, the outer-side non-contact portion 40 is formed away from the cylinder block 2 and the case 3 so as not to be in contact with either of the cylinder block 2 or the case 3.
  • the outer-side non-contact portion 40 has, as illustrated in Fig. 3 , an exposed portion 50 not coated with the resin layer 22 but exposing the core member 21.
  • eight exposed portions 50 disposed at an equal angular interval in the circumferential direction are provided.
  • the core member 21 exposed in the exposed portion 50 is a support portion supported by support pins 62a and 62b (see Fig. 5 ) in mold-forming of the resin layer 22 on the core member 21.
  • the other portions excluding the exposed portion 50 are coated with the resin layer 22. The mold-forming of the resin layer 22 will be described later in detail.
  • the inner-side non-contact portion 45 is formed having a gap from the cylinder block 2 and is formed having a gap from the end cover 5 similarly to the outer-side non-contact portion 40.
  • the inner-side non-contact portion 45 is formed away from the cylinder block 2 and the case 3 so as not to be in contact with either of the cylinder block 2 or the case 3.
  • the inner-side non-contact portion 45 has, as illustrated in Fig. 3 , four exposed portions 50 provided at an equal angular interval in the circumferential direction.
  • the exposed portions 50 are provided on the outer-side non-contact portion 40 and the inner-side non-contact portion 45 not in contact with either of the cylinder block 2 or the case 3. Even if the exposed portion 50 is provided on the outer-side non-contact portion 40 and the inner-side non-contact portion 45, sliding between the cylinder block 2 and the valve plate 20 is not affected. That is, an entire area of the exposed portion 50 can be easily increased without impairing performances of the piston pump 100.
  • the supply port 20a and the discharge port 20b are, as illustrated in Fig. 3 , formed as arc-shaped grooves, respectively.
  • the supply port 20a and the discharge port 20b are defined by the resin layer coating inner peripheral surface with arc-shaped supply base hole 21a and discharge base hole 21b provided in the core member 21, respectively (hereinafter referred to as a "port resin layer 22a"). That is, the port resin layer 22a is coated so as to cover the inner peripheral surfaces with the supply base hole 21a and the discharge base hole 21b. As a result, entry of the water passing through the supply port 20a and the discharge port 20b between the core member 21 and the resin layer 22 is prevented. Therefore, durability of the valve plate 20 can be improved.
  • the port resin layer 22a is, as illustrated in Fig. 2 , formed integrally with the first land portion 30 and the second land portion 35 and is provided continuously to each of them. Since the port resin layer 22a is locked by the inner peripheral surfaces of the supply base hole 21a and the discharge base hole 21b of the core member 21, relative rotation of the first land portion 30 and the second land portion 35 with respect to the core member 21 is regulated by sliding resistance between the cylinder block 2 and the valve plate 20. As described above, the port resin layer 22a is provided so as to cover the inner peripheries of the supply base hole 21a and the discharge base hole 21b and functions as a rotation stopper of the resin layer 22.
  • the shaft insertion hole 20c is defined by the resin layer coating the inner peripheral surface of a circular base through hole 21c provided in the core member 21 (see Fig. 2 ).
  • each piston 6 reciprocates in the cylinder 2b with a stroke amount according to an inclination angle of the swash plate 9.
  • the volume of each volume chamber 7 is increased/decreased.
  • valve plate 20 a manufacturing method of the valve plate 20 will be described by referring to Figs. 4 to 7 .
  • the supply base hole 21a, the discharge base hole 21b, and the base through hole 21c are provided in a disc member made of metal so as to form the core member 21.
  • the supply base hole 21a and the discharge base hole 21b are formed as arc grooves disposed on the same circle, respectively.
  • the core member 21 is accommodated in a cavity 63 formed by an upper die 60 and a lower die 61 for mold-forming.
  • the core member 21 in the cavity 63 is supported by being sandwiched by a plurality of support pins 62a provided on the upper die 60 and a plurality of support pins 62b provided on the lower die 61 from a plate thickness direction.
  • the support pins 62a of the upper die 60 and the support pins 62b of the lower die 61 are provided so as to face each other by sandwiching the core member 21.
  • Fig. 5 only the support pins 62a and 62b on the same section are illustrated, while illustration of the other support pins is omitted.
  • a hatched portion is a support portion where the core member 21 is supported by the support pins 62a and 62b.
  • the core member 21 is supported by the support pins 62a and 62b at eight spots on the outer side in the radial direction of the supply base hole 21a and the discharge base hole 21b at an equal angular interval.
  • the core member 21 is supported by the support pins 62a and 62b at four spots between the supply base hole 21a as well as the discharge base hole 21 b and the base through hole 21c at an equal angular interval.
  • the core member 21 is supported by the support pins 62a and 62b on the base intermediate portion 21d provided between the supply base hole 21a and the discharge base hole 21b in the circumferential direction, that is, on the outer side and the inner side in the radial direction of portions corresponding to the first and second intermediate portions 33 and 38 after coating of the resin layer 22.
  • a resin material is injected into the cavity 63 from an injection port (not shown) so as to mold-form the resin layer 22 on the core member 21.
  • the core member 21 has the outer side and the inner side with the supply base hole 21a and the discharge base hole 21b supported by the support pins 62a and 62b, even if the resin material at a high pressure and a high temperature is injected, deformation of the core member 21 caused by an injection pressure and a heat of the resin material is prevented.
  • the base intermediate portion 21d is located between the supply base hole 21a and the discharge base hole 21b formed as grooves in the circumferential direction, this is a portion with strength smaller than those of the other portions in the core member 21. Since the outer side and the inner side in the radial direction of such base intermediate portion 21 are supported by the support pins 62a and 62b, deformation of the core member 21 in the mold-forming is prevented more reliably.
  • the core member 21 is coated with the resin layer 22 along the shape of the cavity 63. Moreover, by removing the upper die 60 and the lower die 61, the support portion having been supported by the support pins 62a and 62b is exposed to the outside, and the exposed portion 50 is formed. As described above, the eight exposed portions 50 are formed on the outer side of the core member 21, and the four exposed portions 50 are formed on the inner side.
  • the outer-side non-contact portion 40 and the inner-side non-contact portion 45 are formed.
  • the first land portion 30 and the second land portion 35 protruding closer to the plate thickness direction (axial direction) of the valve plate 20 than the outer-side non-contact portion 40 and the inner-side non-contact portion 45 are formed.
  • valve plate 20 is manufactured.
  • the water-pressure rotary machine 100 using water as the operating liquid has been described.
  • the operating liquid may be an operating oil or any other things.
  • the water-pressure rotary machine 100 is a fixed displacement piston pump in which the inclination angle of the swash plate 9 is fixed has been described.
  • the water-pressure rotary machine 100 may be a variable displacement type capable of changing the inclination angle of the swash plate 9.
  • the eight exposed portions 50 are provided on the outer-side non-contact portion 40 on the outer side of the valve plate 20, and the four exposed portions 50 are provided on the inner-side non-contact portion 45 on the inner side.
  • the number of the exposed portions 50 is not limited to them, but an arbitrary number of the exposed portions 50 can be provided.
  • the resin layer 22 is molded in the base hole formed in the core member 21 in advance, and the molded resin layer 22 is machined so as to form the supply port 20a, the discharge port 20b, and the shaft insertion hole 20c.
  • the supply port 20a, the discharge port 20b, and the shaft insertion hole 20c are preferably formed as described above.
  • the base hole is not machined in advance in the core member 21 but the resin layer 22 is molded on the core member 21 and then, the resin layer 22 is machined together with the core member 21 so as to form the supply port 20a, the discharge port 20b, and the shaft insertion hole 20c.
  • first land portion 30 and the second land portion 35 are formed having a similar shape having the same radial width.
  • first land portion 30 and the second land portion 35 may have shapes different from each other.
  • the valve plate 20 has the second land portion 35, and by setting the radial width of the second land portion 35 appropriately, sealing performance between the valve plate 20 and the end cover 5 of the case 3 is ensured.
  • the valve plate 20 does not have the second land portion 35 and the land portion is provided on the end cover 5.
  • the hydraulic rotary machine 100 may be configured such that both the valve plate 20 and the end cover 5 do not have the land portion.
  • the valve plate 20 is in contact with the end cover 5 on the whole end surface faced with the end cover 5.
  • the exposed portion 50 only needs to be provided on the outer-side non-contact portion 40 with which the cylinder block 2 is not in sliding contact. That is, the exposed portion 50 may be provided on a portion in contact with the end cover 5 as long as it is not provided on the first land portion 30 with which at least the cylinder block 2 is in sliding contact.
  • the exposed portion 50 is provided on the outer-side non-contact portion 40 not in contact with the cylinder block 2 or the case 3.
  • the exposed portion 50 supports the core member 21 by the support pins 62a and 62b in mold-forming of the resin layer 22 and is formed by removing the support pins 62a and 62b after the mold-forming.
  • the exposed portion 50 thus formed does not affect sliding between the cylinder block 2 and the valve plate 20.
  • an area of the core member 21 supported in the mold-forming that is, an area of the core member 21 on which the resin layer 22 is not molded and which is exposed after the mold-forming can be increased.
  • an area of the exposed portion 50 deformation in the mold-forming is prevented, and the valve plate 20 with a smaller coating amount of the resin material in the mold-forming can be obtained. Therefore, while the performances of the piston pump 100 are ensured, the manufacturing cost of the piston pump 100 can be reduced.
  • the exposed portion 50 is provided also on the inner-side non-contact portion 45 not in contact with the cylinder block 2 or the case 3.
  • an area supported by the support pins 62a and 62b in the mold-forming that is, the area of the core member 21 exposed after the mold-forming can be further increased. Therefore, the valve plate 20 whose deformation is prevented more reliably and having a smaller coating amount of the resin material can be obtained, and the manufacturing cost of the piston pump 100 can be further reduced.
  • valve plate 20 the outer side and the inner side in the radial direction of the base intermediate portion 20d with relatively lower strength is supported by the support pins 62a and 62b, and the exposed portion 50 is provided on the outer sides and the inner sides in the radial direction of the first and second intermediate portions 33 and 38.
  • the valve plate 20 with deformation of the core member 21 prevented more reliably can be obtained.
  • a piston pump 200 according to a second embodiment of the present invention will be described by referring to Figs. 8 to 10 .
  • points different from the first embodiment will be mainly described, and the same reference numerals are given to the same constitutions as those in the piston pump 100 in the aforementioned first embodiment, and explanation will be omitted.
  • the exposed portion 50 is provided on a part of the outer-side non-contact portion 40 and also provided on a part of the inner-side non-contact portion 45.
  • a valve plate 120 of the piston pump 200 is different from the aforementioned first embodiment in a point that all of an outer-side non-contact portion 140 is formed as an exposed portion, and all of an inner-side non-contact portion 145 is formed as an exposed portion.
  • valve plate 120 of the piston pump 200 has the outer-side non-contact portion 140 formed as the exposed portion and the inner-side non-contact portion 145 formed as the exposed portion.
  • a shaft insertion hole 120c is a through hole formed in the core member 21 in advance and its inner periphery is not covered by the resin layer 22 as in the aforementioned first embodiment.
  • the shaft insertion hole 120c has an inner diameter larger than an outer diameter of the shaft 1 and is formed so that the shaft 1 is not brought into contact. Thus, even if the inner periphery of the shaft insertion hole 120c is not covered by the resin layer 22, the shaft 1 and the valve plate 20 are not in contact with each other, and the performances of the piston pump is not lowered.
  • the core member 21 is, as illustrated in Fig. 10 , supported on the entire outer peripheral portion by annular clamp members 162a and 162b provided on an upper die 160 and a lower die 161, and the entire center portion is supported by columnar members 163a and 163b provided on the upper die 60 and the lower die 61.
  • the valve plate 120 in which all the outer-side non-contact portion 40 on the outer peripheral portion is formed as the exposed portion, and all the outer-side non-contact portion 40 on the center portion is formed as the exposed portion is obtained.
  • the entire outer-side non-contact portion 140 is the exposed portion and the entire inner-side non-contact portion 145 at the center is the exposed portion.
  • the resin amount in the mold-forming of the valve plate 120 can be further reduced.
  • mold-forming is performed while the entire outer periphery corresponding to the outer-side non-contact portion 140 is supported by the clamp members 162a and 162b, and the center portion corresponding to the entire inner-side non-contact portions 45 is supported by the columnar members 163a and 163b.
  • the core member 21 is supported by a larger area, deformation of the core member 21 in the mold-forming can be prevented more reliably. Therefore, in the piston pump 200, deformation in the mold-forming of the resin layer 22 can be prevented more reliably, and the valve plate 120 with the smaller coating amount of the resin material can be obtained, and the manufacturing cost of the piston pump can be further reduced.
  • Each of the piston pumps 100 and 200 include the cylinder block 2 to which the shaft 1 is connected and rotated with the shaft 1, the plurality of cylinders 2b 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 2b and dividing the volume chamber 7 inside the cylinder 2b, the shoe 8 rotatably connected to the tip end of the piston 6, the swash plate 9 with which the shoe 8 is in sliding contact, the case 3 accommodating the cylinder block 2, the valve plate 20 or 120 formed by the core member 21 and the resin layer 22 coating the core member 21,provided with the supply port 20a through which the water supplied to the volume chamber 7 passes and the discharge port 20b through which the water discharged from the volume chamber 7 passes, and interposed between the cylinder block 2 and the end cover 5 of the case 3.
  • the valve plate 20 or 120 has the first land portion 30 formed by the resin layer 22 and with which the cylinder block 2 is in sliding contact and the non-contact portion (the outer-side non-contact portion 40 or 140, the inner-side non-contact portion 45 or 145) separated away from the cylinder block 2, and at least a part of the non-contact portion (the outer-side non-contact portion 40 or 140, the inner-side non-contact portion 45 or 145) is the exposed portion 50 where the core member 21 is exposed.
  • the exposed portion 50 is provided on the non-contact portion (the outer-side non-contact portion 40 or 140, the inner-side non-contact portion 45 or 145) with which the cylinder block 2 is not in sliding contact in the valve plate 20 or 120.
  • the coating amount of the resin material is reduced without imparing the performances of the piston pump 100 or 200. Therefore, the manufacturing cost of the piston pump 100 or 200 can be reduced.
  • the supply port 20a and the discharge port 20b are defined by the port resin layer 22a coating the inner peripheral surfaces of the supply base hole 21a and the discharge base hole 21b provided in the core member 21, respectively, and the port resin layer 22a is provided continuously to the first land portion 30.
  • the non-contact portion has the outer-side non-contact portion 40 or 140 provided closer to the outer side in the radial direction than the first land portion 30, and at least a part of the outer-side non-contact portion 40 or 140 is the exposed portion 50.
  • the non-contact portion has the inner-side non-contact portion 45 or 145 provided on the inner side in the radial direction of the first land portion 30, and at least a part of the inner-side non-contact portion 45 or 145 is the exposed portion 50.
  • the exposed portion 50 is provided on the outer-side non-contact portion 40 or 140 and the inner-side non-contact portion 45 or 145 not in contact wither with the cylinder block 2 or the case 3.
  • the coating amount of the resin material is reduced without imparing the performances of the piston pump 100.
  • At least a part of the core member 21 exposed in the exposed portion 50 is the support portion supported in the mold-forming of the resin layer 22.
  • the supply port 20a and the discharge port 20b are formed as arc-shaped grooves, respectively, and the exposed portion 50 which is the support portion is provided on at least one of the outer side in the radial direction and the inner side in the radial direction of the first intermediate portion 33 and the second intermediate portion 38 provided between the supply port 20a and the discharge port 20b in the circumferential direction.
  • the whole non-contact portion (the outer-side non-contact portion 40, 140, the inner-side non-contact portion 45, 145) is formed as the exposed portion.
  • valve plate 20, 120 interposed between the cylinder block 2 and the case 3 of the piston pump 100 or 200 and formed by the core member 21 and the resin layer 22 coating the core member 21 has the first land portion 30 formed by the resin layer 22 and with which the cylinder block 2 is in sliding contact and the non-contact portion (the outer-side non-contact portion 40 or 140, the inner-side non-contact portion 45 or 145) separated away from the cylinder block 2, and at least a part of the non-contact portion (the outer-side non-contact portion 40 or 140, the inner-side non-contact portion 45 or 145) is the exposed portion 50 where the core member 21 is exposed.
  • the exposed portion 50 is provided on the non-contact portion (the outer-side non-contact portion 40 or 140, the inner-side non-contact portion 45 or 145) with which the cylinder block 2 is not in sliding contact in the valve plate 20 or 120.
  • the coating amount of the resin material is reduced without imparing the performances of the piston pump 100 or 200. Therefore, the manufacturing cost of the piston pump 100 or 200 can be reduced.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Reciprocating Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Hydraulic Motors (AREA)
EP16846538.3A 2015-09-16 2016-09-14 Hydraulic rotary machine, and valve plate for same Withdrawn EP3351793A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2015183215A JP2017057790A (ja) 2015-09-16 2015-09-16 液圧回転機及びそのバルブプレート
PCT/JP2016/077189 WO2017047667A1 (ja) 2015-09-16 2016-09-14 液圧回転機及びそのバルブプレート

Publications (1)

Publication Number Publication Date
EP3351793A1 true EP3351793A1 (en) 2018-07-25

Family

ID=58288871

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16846538.3A Withdrawn EP3351793A1 (en) 2015-09-16 2016-09-14 Hydraulic rotary machine, and valve plate for same

Country Status (5)

Country Link
US (1) US20190145388A1 (ja)
EP (1) EP3351793A1 (ja)
JP (1) JP2017057790A (ja)
CN (1) CN108026904A (ja)
WO (1) WO2017047667A1 (ja)

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5756147A (en) * 1980-09-22 1982-04-03 Nippon Light Metal Co Ltd Method for internal chill casting
CN85109439A (zh) * 1984-12-29 1986-07-16 株式会社日立制作所 流体机械设备
JPH0421018Y2 (ja) * 1986-05-07 1992-05-13
JPH0283383U (ja) * 1988-12-15 1990-06-27
FR2664661B1 (fr) * 1990-07-10 1994-06-17 Messier Bugatti Machine tournante hydraulique.
CN1025754C (zh) * 1991-12-30 1994-08-24 甘肃工业大学 低噪声轴向柱塞泵的配流盘
DE4301133C2 (de) * 1993-01-18 1995-05-18 Danfoss As Hydraulische Kolbenmaschine
DE4341846C1 (de) * 1993-12-08 1995-07-13 Danfoss As Steuerspiegel für eine hydraulische Kolbenmaschine
DE4417011C2 (de) * 1994-05-13 1996-11-28 Danfoss As Hydraulische Kolbenmaschine

Also Published As

Publication number Publication date
JP2017057790A (ja) 2017-03-23
US20190145388A1 (en) 2019-05-16
WO2017047667A1 (ja) 2017-03-23
CN108026904A (zh) 2018-05-11

Similar Documents

Publication Publication Date Title
US5829338A (en) Pump having unidirectional tapered land thrust bearing cluster
JP5063823B1 (ja) 斜軸式アキシャルピストンポンプ・モータ
US9410540B2 (en) Variable displacement hydraulic motor/pump
KR101737714B1 (ko) 대향식 경사판형 액압 회전기
US20130152777A1 (en) Hydraulic pump or motor
US7975600B2 (en) Axial piston machine, recoil plate and method of manufacturing a recoil plate
US20170037837A1 (en) Swash plate type liquid-pressure rotating device and method of manufacturing same
EP3351793A1 (en) Hydraulic rotary machine, and valve plate for same
EP2778410B1 (en) Hydraulic rotary machine
US20190055931A1 (en) Hydraulic rotary machine
EP3296568B1 (en) Piston, and hydraulic rotating machine provided with same
US20190264564A1 (en) Cylinder block and swash plate type liquid-pressure rotating apparatus including same
CN219366459U (zh) 液压旋转装置
JP4047790B2 (ja) 斜板形液圧装置のシュー
JP6885861B2 (ja) 液圧回転機
JP5480096B2 (ja) 斜板式ピストンポンプ・モータ
JP6672213B2 (ja) 斜軸式液圧回転機
JP6553989B2 (ja) 液圧回転機
JPH0347437B2 (ja)
JPH1077954A (ja) アキシャルピストン装置
JP2019035363A (ja) 液圧回転機
JP2020153326A (ja) 斜軸式アキシャルピストンポンプ
JP2016211539A (ja) ピストン、及びそれを備える液圧回転機械
JPH05164038A (ja) 斜板型液圧回転機
JPH09170567A (ja) ピストン型液圧装置

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20180312

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

DAV Request for validation of the european patent (deleted)
DAX Request for extension of the european patent (deleted)
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Effective date: 20190109