WO2022145392A1 - Pompe à piston, et procédé de fabrication d'élément d'étanchéité - Google Patents

Pompe à piston, et procédé de fabrication d'élément d'étanchéité Download PDF

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Publication number
WO2022145392A1
WO2022145392A1 PCT/JP2021/048356 JP2021048356W WO2022145392A1 WO 2022145392 A1 WO2022145392 A1 WO 2022145392A1 JP 2021048356 W JP2021048356 W JP 2021048356W WO 2022145392 A1 WO2022145392 A1 WO 2022145392A1
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WO
WIPO (PCT)
Prior art keywords
peripheral side
piston
seal member
inner peripheral
piston pump
Prior art date
Application number
PCT/JP2021/048356
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English (en)
Japanese (ja)
Inventor
健太郎 千葉
Original Assignee
日立Astemo株式会社
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 日立Astemo株式会社 filed Critical 日立Astemo株式会社
Priority to JP2022573069A priority Critical patent/JPWO2022145392A1/ja
Publication of WO2022145392A1 publication Critical patent/WO2022145392A1/fr

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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
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/14—Pistons, piston-rods or piston-rod connections
    • 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
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections

Definitions

  • the present invention relates to a method for manufacturing a piston pump and a seal member.
  • the piston pump As described in Patent Document 1, for example, the piston pump includes a driving member such as an eccentric cam and a piston (also referred to as a plunger) that reciprocates in the cylinder chamber with the movement of the driving member.
  • This piston pump is configured to suck the brake fluid into the cylinder chamber from the suction hole and discharge the brake fluid in the cylinder chamber to the discharge hole by reciprocating the piston.
  • a seal member (X ring) is interposed between the cylinder chamber and the piston, and the seal member separates (seals) the pump chamber and the cam chamber.
  • the outer peripheral surface of the seal member may slide with respect to the inner surface of the cylinder chamber. If the outer peripheral surface of the seal member slides with respect to the inner surface of the cylinder chamber, the pressure increase of the brake fluid in the pump chamber may be affected. Therefore, it is desired to develop a technique for preventing this. ..
  • An object of the present invention is to solve the above-mentioned problems and to provide a piston pump capable of satisfactorily boosting the liquid in the pump chamber, and further to provide a method for manufacturing a seal member used in the piston pump. Make it an issue.
  • the piston pump of the present invention has a piston formed in a pump body that reciprocates in a cylinder chamber, and an annular seal provided between the inner peripheral surface of the cylinder chamber and the piston. It is a piston pump equipped with a member.
  • the seal member includes an inner peripheral side surface that is in sliding contact with the piston and an outer peripheral side surface that is in close contact with the inner peripheral surface of the cylinder chamber. It is characterized in that an uneven surface is formed on the inner peripheral side surface so that the inner peripheral side surface has a lower friction surface than the outer peripheral side surface.
  • the slidability of the piston can be improved and the adhesion of the seal member to the cylinder chamber can be improved. Can be improved. As a result, the movement of the seal member due to the reciprocating movement of the piston can be suppressed, and the liquid in the pump chamber can be satisfactorily boosted.
  • the inner peripheral side surface and the outer peripheral side surface are separated by a parting line.
  • the parting lines are arranged so as to connect the lip portions arranged diagonally to each other. Is preferable.
  • the seal member has a substantially elliptical cross section in which the sliding direction of the piston is the major axis and the direction orthogonal to the major axis is the minor axis, the parting line is provided with respect to the major axis. It is preferable to position it on a line that is inclined with respect to the short axis.
  • the seal member has a substantially D-shaped cross section in which the central portion of the inner peripheral side surface in the width direction bulges toward the piston, the inner peripheral side surface and the outer peripheral side surface side are partyed. It is preferable to partition by a cross section.
  • the seal member in the method for manufacturing a seal member of the present invention, in the method for manufacturing a seal member exhibiting an annular shape, the seal member is manufactured with a mold provided with a diagonally split split surface inclined with respect to the axial direction of the seal member. It is characterized by doing. That is, the method for manufacturing a seal member of the present invention is to manufacture the seal member with a mold provided with a split surface along the side surface (tapered surface) of the truncated cone.
  • the present invention it is possible to inexpensively and easily manufacture a sealing member whose inner peripheral side surface in sliding contact with the piston has a lower friction surface than the outer diameter surface side in close contact with the cylinder chamber.
  • the seal member of the present invention between the cylinder chamber formed in the pump body and the piston reciprocating in the cylinder chamber, the slidability of the piston can be improved and the adhesion to the cylinder chamber can be improved.
  • a piston pump capable of satisfactorily boosting the liquid in the pump chamber can be obtained.
  • FIG. 6 is a schematic view showing a section of an inner peripheral side surface provided with a divided surface and an uneven surface when molding the seal member shown in FIG. 6. It is an enlarged sectional view which shows the sealing member and parting line of other forms used in the piston pump which concerns on embodiment of this invention.
  • FIG. 3 is a schematic view showing a section of an inner peripheral side surface provided with a divided surface and an uneven surface when molding the seal member shown in FIG. 8.
  • the brake fluid pressure control device 1 includes a base 100 as a pump body, a solenoid valve 104 attached to the front surface 103 of the base 100, and a motor (electric motor) 105.
  • a control housing (not shown) containing a control device is attached to the front surface 103 of the substrate 100.
  • One end of the cylinder chamber 102 constituting the piston pump 10 is open on the side surface 101 of the substrate 100.
  • One end opening of the cylinder chamber 102 is sealed with a lid member 19.
  • a plurality of flow paths (not shown) through which the brake fluid as a liquid flows are formed in the substrate 100.
  • Such a brake fluid pressure control device 1 is used for a bar handle type vehicle such as a motorcycle, a tricycle, and an all-terrain vehicle (ATV).
  • the brake fluid pressure control device 1 controls the brake fluid pressure acting on the wheel brake, and is connected between the master cylinder chamber (not shown) and the wheel brake.
  • FIG. 2 is a cross-sectional view of the piston pump 10 to which the seal member 20 of the present embodiment is applied.
  • the piston pump 10 is a pump driven by an electric motor 105 (see FIG. 1).
  • the piston pump 10 includes a cylinder chamber 102, a seat member 12, a piston 15, an eccentric cam 14 that functions as a drive member, a coil spring 16, and a lid member 19. ..
  • the cylinder chamber 102 opens to the side surface 101 of the substrate 100, and the other end communicates with the cam chamber 120 through which the motor shaft 106 is inserted.
  • the cylinder chamber 102 has a stepped cylindrical shape that narrows stepwise from the side surface 101 of the substrate 100 toward the center.
  • the cylinder chamber 102 has a large diameter portion 112 that opens to the side surface 101, a first middle diameter portion 113 that is continuous with one end of the large diameter portion 112, and a second middle diameter portion 114 that is continuous with one end of the first middle diameter portion 113. And a small diameter portion 115 continuous with one end of the second middle diameter portion 114.
  • a lid member 19 is attached to the large diameter portion 112, and a seat member 12 is attached to the first medium diameter portion 113. Further, the seal member 20 is arranged inside the second middle diameter portion 114. The piston 15 is arranged from the inside of the first middle diameter portion 113 to the inside of the small diameter portion 115.
  • the lid member 19 has a concave cross section (U-shaped cross section), and closes the opening of the large diameter portion 112 (one end opening of the cylinder chamber 102).
  • the concave inner space of the lid member 19 accommodates the urging spring 25a constituting the discharge valve 25 and the spherical valve body 25b.
  • the valve body 25b is urged toward the seat member 12 by the urging spring 25a, and is seated in the hole portion 12a formed at the bottom of one end of the seat member 12.
  • a discharge port 18 communicating with the concave inner space is formed on the peripheral wall portion of the lid member 19. Brake fluid is discharged from the piston pump 10 through the discharge port 18.
  • the seat member 12 has a bottomed cylindrical shape, and forms a pump chamber 13 having a concave inner space.
  • a suction port 17 communicating with the space portion 113a formed inside the first middle diameter portion 113 is formed on the peripheral wall portion of the seat member 12.
  • the space portion 113a is configured so that the brake fluid flows into the space portion 113a through a suction valve and a suction port 17 (not shown).
  • the pump chamber 13 is a space for increasing the hydraulic pressure of the brake fluid.
  • a coil spring 16 is arranged in the pump chamber 13. The coil spring 16 abuts on one end of the piston 15 arranged in the pump chamber 13 and urges the piston 15 toward the eccentric cam 14 on the other end side.
  • the eccentric cam 14 is attached to the output shaft 106 of the electric motor 105.
  • the seal member 20 is arranged inside the second middle diameter portion 114, and is externally fitted at a substantially intermediate position of the piston 15.
  • the seal member 20 is sandwiched between the inner peripheral surface of the second middle diameter portion 114 of the cylinder chamber 102 and the outer peripheral surface of the piston 15, and is between the inner peripheral surface of the second middle diameter portion 114 and the outer peripheral surface of the piston 15. Is sealed liquid tightly.
  • Such a sealing member 20 is positioned between two annular stoppers 26a and 26b internally fitted on the inner surface of the second middle diameter portion 114 as shown in FIG. Details of the seal member 20 will be described later.
  • the piston 15 reciprocates in the cylinder chamber 102 in the axial direction due to the eccentric cam 14. Then, the piston 15 moves to the other end side (cam chamber 120 side) to suck the brake liquid into the pump chamber 13 from the suction port 17, and the piston 15 moves to one end side (pump chamber 13 side). , The brake liquid is discharged from the inside of the pump chamber 13 to the discharge path 116 via the discharge valve 25 and the discharge port 18.
  • the seal member 20 is made of a resin ring-shaped member having low sliding resistance with the outer peripheral surface of the piston 15 and having toughness and wear resistance. As shown in FIG. 3, the seal member 20 has a lip portion 21 protruding in all directions, and has a substantially X-shaped cross section.
  • the outer surface of the seal member 20 is provided with an inner peripheral side surface 23 that is in close contact with the outer peripheral surface of the piston 15 and an outer peripheral side surface 24 that is in close contact with the inner peripheral surface of the cylinder chamber 102.
  • the inner peripheral side surface 23 refers to the surface represented by the alternate long and short dash line in the section 23a in FIG. 3, and is set by the section from the overflow portion 22a to the diagonally located overflow portion 22b inside the sealing member 20 in the radial direction. Has been done.
  • the outer peripheral side surface 24 refers to the remaining surface other than the inner peripheral side surface 23.
  • the seal member 20 includes a parting line P1 as shown in FIG.
  • the seal member 20 is formed by a divided surface P11 (see FIG. 4) that is sealed by diagonally splitting inclined with respect to the axial direction X1 of the seal member 20, and the inner peripheral side surface 23 and the outer peripheral side surface 24 are formed by the divided surface P11. And are divided.
  • the axial direction X1 of the seal member 20 is the same direction as the axial direction (sliding direction) of the piston 15.
  • the seal member 20 is compression-molded by an upper mold (mold) 51 and a lower mold (mold) 52 that are vertically divided.
  • the split surface P11 of the upper die 51 and the lower die 52 is along the overflow portions 22a and 22b (recesses 55a and 55b) of the lip portion 21 arranged diagonally, and is axially X1 on the inner peripheral side and the outer peripheral side. The positions are different from each other (in the axial direction of the piston 15).
  • the inner surface 53 of the lower mold 52 has a shape corresponding to the shape of the inner peripheral side surface 23 (section 23a, see FIG. 3) of the seal member 20.
  • the inner surface 53 of the lower mold 52 is entirely satin-finished. That is, in the lower mold 52, the satin finish is not applied to a part of the inner surface 53, but the satin finish is applied to the entire inner surface 53, so that the satin finish can be easily applied.
  • the inner surface 54 of the upper die 51 has a shape corresponding to the shape of the outer peripheral side surface 24 (see FIG. 3) of the seal member 20.
  • the inner surface 54 of the upper die 51 is a surface that is not subjected to satin finish.
  • the upper mold 51 is formed with recesses 55a and 55b which are overflow portions 22a and 22b (see FIG. 3).
  • the upper mold 51 and the lower mold 52 are separated vertically, and a resin material for molding the seal member 20 is arranged on the lower mold 52. After that, the upper mold 51 and the lower mold 52 are closed, and the heating state is maintained for a predetermined cross-linking time. After that, the upper mold 51 and the lower mold 52 are released from each other and the molded product is cooled to obtain a seal member 20 having an uneven surface formed only on the inner peripheral side surface 23.
  • the structure of the upper and lower molds 61 and 62 includes a split surface P2 that is vertically divided at a substantially central portion in the axial direction X1 of the seal member (). It is partitioned in the vicinity of the recesses 66a and 66b which are the overflow portions). That is, the split surfaces P2 of the molds 61 and 62 are at the same position in the axial direction X1 (axial direction of the piston 15) on the inner peripheral side and the outer peripheral side of the seal member.
  • the upper die 61 and the lower die 62 are divided into the inner peripheral side surface and the inner peripheral side surface. It is necessary to apply the masking treatments 63a and 63b to the portions 63 and 63, respectively. Therefore, there is a problem that the molding of the seal member is complicated. In particular, in the case of taking a large number of pieces, if the satin finish is changed by masking, the satin finish change surface varies depending on the masking condition of each cavity, so that the load during sliding may vary. Further, when the seal member has a small diameter, it is difficult to separately perform the masking treatment on the upper die 61 and the lower die 62, and the magnitude of the sliding resistance between the inner peripheral side surface and the outer peripheral side surface is different. Was impossible.
  • the inner peripheral side surface and the outer peripheral side surface are partitioned by the parting line P1 by the diagonally divided split surface P11 inclined with respect to the axial direction X1 of the seal member 20. It has become.
  • the uneven surface can be formed on the inner peripheral side surface 23 only by the lower mold 52, so that the sealing member 20 can be easily formed.
  • an uneven surface can be formed on the inner peripheral side surface 23 only by the lower mold 52, so that the sliding resistance between the inner peripheral side surface 23 and the outer peripheral side surface 24 can be increased. It is easy to make a difference.
  • the uneven surface can be formed on the inner peripheral side surface 23 only by the lower mold 52, it is suitable for molding the seal member 20 by taking a large number of pieces, and the load at the time of sliding does not vary.
  • the magnitude of the sliding resistance between the inner peripheral side surface and the outer peripheral side surface of the seal member 20 can be easily made different, so that the slidability of the piston 15 is improved.
  • the adhesion of the seal member 20 to the cylinder chamber 102 can be improved.
  • the movement of the seal member 20 due to the reciprocating movement of the piston 15 can be suppressed, and the brake fluid in the pump chamber 13 can be satisfactorily boosted.
  • FIG. 6 is an enlarged cross-sectional view showing another form of the seal member 20A and the parting line P3 used in the piston pump 10 according to the embodiment of the present invention
  • FIG. 7 shows the molding of the seal member 20A shown in FIG. It is a schematic diagram which shows the section of the inner peripheral side surface 23 which provided with the division surface P13 and the uneven surface of.
  • the seal member 20A shown in FIG. 6 has a substantially elliptical cross section having a major axis in the axial direction X1 (sliding direction of the piston 15) and a minor axis in the radial direction of the seal member 20A orthogonal to the major axis.
  • the seal member 20A also has an inner peripheral side surface 23 that is in close contact with the outer peripheral surface of the piston 15 and an outer peripheral side surface 24 that is in close contact with the inner peripheral surface of the cylinder chamber 102.
  • the inner peripheral side surface 23 is a surface represented by a two-dot chain line of the section 23a in FIG. 6, and is set by a section from the overflow portion 22a to the overflow portion 22b located substantially diagonally inside the sealing member 20 in the radial direction.
  • the outer peripheral side surface 24 is the remaining surface other than the inner peripheral side surface 23.
  • the seal member 20A includes a parting line P3 as shown in FIG. As shown in FIG. 7, the seal member 20A is formed by a split surface P13 that is sealed by an oblique split that is inclined with respect to the axial direction X1 of the seal member 20A, and the inner peripheral side surface 23 and the outer periphery are formed by the split surface P13.
  • the side surface 24 is partitioned.
  • the seal member 20A is compression-molded by the upper mold 51A and the lower mold 52A which are vertically divided.
  • the inner surface 53 of the lower mold 52A has a shape corresponding to the shape of the inner peripheral side surface 23 (section 23a, see FIG. 6) of the seal member 20A.
  • the inner surface 53 of the lower mold 52A is entirely satin-finished. That is, in the lower mold 52A, the satin finish is not applied to a part of the inner surface 53, but the satin finish is applied to the entire inner surface 53, so that the satin finish can be easily applied.
  • the inner surface 54 of the upper die 51A has a shape corresponding to the shape of the outer peripheral side surface 24 (see FIG. 6) of the sealing member 20A.
  • the inner surface 54 of the upper die 51A is a surface that is not subjected to the satin finish treatment.
  • FIG. 8 is an enlarged cross-sectional view showing another form of the seal member 20B and the parting line P4 used for the piston pump 10 according to the embodiment of the present invention
  • FIG. 9 shows the molding of the seal member 20B shown in FIG. It is a schematic diagram which shows the section of the inner peripheral side surface 23 which provided with the division surface P14 and the uneven surface of.
  • the seal member 20B shown in FIG. 8 has a substantially D-shaped cross section.
  • the seal member 20B also has an inner peripheral side surface 23 that is in close contact with the outer peripheral surface of the piston 15 and an outer peripheral side surface 24 that is in close contact with the inner peripheral surface of the cylinder chamber 102.
  • the inner peripheral side surface 23 is a surface represented by a two-dot chain line of the section 23a in FIG. 8, and is set by a section from the overflow portion 22a to the overflow portion 22b located substantially diagonally inside the seal member 20B in the radial direction. ing.
  • a convex portion 27 that protrudes inward in the radial direction in a curved shape is provided.
  • the outer peripheral side surface 24 is the remaining surface other than the inner peripheral side surface 23.
  • the seal member 20B includes a parting line P4 as shown in FIG. As shown in FIG. 9, the seal member 20B is formed by a divided surface P14 that is sealed by an oblique division that is inclined with respect to the axial direction X1 of the seal member 20B, and the inner peripheral side surface 23 and the outer periphery are formed by the divided surface P14.
  • the side surface 24 is partitioned.
  • the seal member 20B is compression-molded by the upper die 51B and the lower die 52B which are vertically divided.
  • the inner surface 53 of the lower mold 52B has a shape corresponding to the shape of the inner peripheral side surface 23 (section 23a, see FIG. 8) of the seal member 20B.
  • the inner surface 53 of the lower mold 52B is entirely satin-finished. That is, in the lower mold 52B, the satin finish is not applied to a part of the inner surface 53, but the satin finish is applied to the entire inner surface 53, so that the satin finish can be easily applied.
  • the inner surface 54 of the upper die 51B has a shape corresponding to the shape of the outer peripheral side surface 24 (see FIG. 8) of the sealing member 20B.
  • the inner surface 54 of the upper die 51B is a surface that is not subjected to the satin finish treatment.
  • the present invention can be suitably applied to a piston pump in which an inlet valve and an outlet valve are arranged in a direction orthogonal to the axis of the piston 15.
  • the present invention can be suitably applied to the piston pump 10 using a normal O-ring.
  • Brake fluid pressure control device 10 Piston pump 15 Piston 20 Seal member 20A to 20B Seal member 21 Lip part 23 Inner peripheral side surface 24 Outer peripheral side surface 100 Base (pump body) 102 Cylinder chamber P1, P3, P4 Parting line P11, P13, P14 Dividing surface X1 Axial direction

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Sealing Devices (AREA)
  • Details Of Reciprocating Pumps (AREA)

Abstract

La présente invention concerne une pompe à piston et un procédé de fabrication d'un élément d'étanchéité, avec lequel il est possible d'empêcher une surface circonférentielle externe de l'élément d'étanchéité coulissant le long d'une surface interne d'une chambre de cylindre, et avec lequel une augmentation de la pression dans une chambre de pompe peut être maintenue de manière satisfaisante. Une pompe à piston (19) est pourvue : d'un piston (15) qui effectue un mouvement de va-et-vient dans une chambre de cylindre (102) formée dans un corps de pompe ; et d'un élément d'étanchéité annulaire (20) disposé entre une surface circonférentielle interne de la chambre de cylindre (102) et le piston (15). L'élément d'étanchéité (20) est pourvu : d'une surface latérale circonférentielle interne (23) en contact coulissant avec le piston (15) ; et d'une surface latérale circonférentielle externe (24) en contact étroit avec la surface circonférentielle interne de la chambre de cylindre (102). Une surface irrégulière est formée sur la surface latérale circonférentielle interne (23), et la surface latérale circonférentielle interne (23) est une surface ayant un frottement inférieur à la surface latérale circonférentielle externe (24).
PCT/JP2021/048356 2020-12-28 2021-12-24 Pompe à piston, et procédé de fabrication d'élément d'étanchéité WO2022145392A1 (fr)

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JP2022573069A JPWO2022145392A1 (fr) 2020-12-28 2021-12-24

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JP2020-218432 2020-12-28
JP2020218432 2020-12-28

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WO2022145392A1 true WO2022145392A1 (fr) 2022-07-07

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5829413U (ja) * 1981-08-18 1983-02-25 オムロン株式会社 Ｏリング用金型
JPS59500680A (ja) * 1982-04-23 1984-04-19 ヘツプ　プロダクツ　アクチ−ボラグ 可動部品間のシ−ル装置
JP2014020256A (ja) * 2012-07-17 2014-02-03 Nissin Kogyo Co Ltd ピストンポンプ
JP2017172617A (ja) * 2016-03-22 2017-09-28 Nok株式会社 密封装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5829413U (ja) * 1981-08-18 1983-02-25 オムロン株式会社 Ｏリング用金型
JPS59500680A (ja) * 1982-04-23 1984-04-19 ヘツプ　プロダクツ　アクチ−ボラグ 可動部品間のシ−ル装置
JP2014020256A (ja) * 2012-07-17 2014-02-03 Nissin Kogyo Co Ltd ピストンポンプ
JP2017172617A (ja) * 2016-03-22 2017-09-28 Nok株式会社 密封装置

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