JP7007935B2

JP7007935B2 - Hydraulic pump

Info

Publication number: JP7007935B2
Application number: JP2018011018A
Authority: JP
Inventors: 宣尚渡邊
Original assignee: Toyooki Kogyo Co Ltd
Current assignee: Toyooki Kogyo Co Ltd
Priority date: 2018-01-26
Filing date: 2018-01-26
Publication date: 2022-01-25
Anticipated expiration: 2038-01-26
Also published as: JP2019127914A

Description

本発明は、吸入チェック弁と吐出チェック弁を有し、ピストンを直線往復運動して液体を吸入吐出する液圧ポンプに関するものである。 The present invention relates to a hydraulic pump having a suction check valve and a discharge check valve, which reciprocates a piston linearly to suck and discharge a liquid.

この種の液圧ポンプは、ポンプ室（圧力室）に液体（作動油）を吸入する際に開く吸入チェック弁（吸入弁）と、ポンプ室（圧力室）から液体（作動油）を吐出する際に開く吐出チェック弁（吐出弁）とを有し、駆動部（可動コア）を駆動してピストンを往復動させることにより液体（作動油）を吸入吐出している。そして、吸入チェック弁（吸入弁）と吐出チェック弁（吐出弁）のいずれか一方は、ピストンの外周面に摺接可能に配置した断面コ字形状のカップシールであって、カップシールの内周側の端部である開口部がポンプ室（圧力室）内の圧力変化に応じてピストンの外周面に当接することで液体（作動油）の流れを阻止すると共に、ピストンの外周面から離間することで液体（作動油）の流れを許容している。 This type of hydraulic pump has a suction check valve (suction valve) that opens when liquid (hydraulic oil) is sucked into the pump chamber (pressure chamber), and liquid (hydraulic oil) is discharged from the pump chamber (pressure chamber). It has a discharge check valve (discharge valve) that opens at the time, and drives the drive unit (movable core) to reciprocate the piston to suck and discharge the liquid (hydraulic oil). Either the suction check valve (suction valve) or the discharge check valve (discharge valve) is a cup seal having a U-shaped cross section arranged so as to be slidable on the outer peripheral surface of the piston, and is the inner circumference of the cup seal. The opening, which is the end on the side, abuts on the outer peripheral surface of the piston in response to the pressure change in the pump chamber (pressure chamber), thereby blocking the flow of liquid (hydraulic oil) and separating it from the outer peripheral surface of the piston. This allows the flow of liquid (hydraulic oil).

特開２０１６－７０２３８号公報Japanese Unexamined Patent Publication No. 2016-701238 特開２０１２－１１７６４３号公報（図５）Japanese Unexamined Patent Publication No. 2012-117643 (Fig. 5)

ところが、かかる従来の液圧ポンプでは、吸入チェック弁または吐出チェック弁のいずれか一方をピストンの外周面に摺接可能に配置しているため、駆動部を駆動してピストンを往復動すると、ピストンと吸入チェック弁または吐出チェック弁との間に摺動抵抗が生じ、ピストンの作動応答性が低下してしまう。この問題を解決するため、特許文献２の図５に示す如く、吸入チェック弁と吐出チェック弁をいずれも、弁体を弁座に着座する方向に弾性部材で付勢して閉作動するチェック弁とする構成が考えられる。この構成では、両チェック弁はピストンに当接しないから、ピストンに両チェック弁による摺動抵抗は生じない。しかし、両チェック弁の部品点数が増加して、構成が複雑になるという問題点があった。 However, in such a conventional hydraulic pump, either the suction check valve or the discharge check valve is arranged so as to be in sliding contact with the outer peripheral surface of the piston. Therefore, when the drive unit is driven to reciprocate the piston, the piston is reciprocated. A sliding resistance is generated between the suction check valve and the suction check valve or the discharge check valve, and the operation responsiveness of the piston is lowered. In order to solve this problem, as shown in FIG. 5 of Patent Document 2, both the suction check valve and the discharge check valve are checked valves that are urged by an elastic member in the direction in which the valve body is seated on the valve seat and closed. The configuration is conceivable. In this configuration, since both check valves do not abut on the piston, sliding resistance due to both check valves does not occur on the piston. However, there is a problem that the number of parts of both check valves increases and the configuration becomes complicated.

本発明の課題は、部品点数の増加を抑制して構成の簡素化を図ると共に、ピストンに吸入チェック弁および吐出チェック弁による摺動抵抗を発生しないで、ピストンの作動応答性を向上し得る液圧ポンプを提供するものである。 The subject of the present invention is a liquid capable of improving the operation responsiveness of the piston by suppressing an increase in the number of parts and simplifying the configuration and without generating sliding resistance by the suction check valve and the discharge check valve on the piston. It provides a pressure pump.

かかる課題を達成すべく、本発明は次の手段をとった。即ち、ピストンを直線往復運動して液体を吸入吐出する液圧ポンプにおいて、ピストンを駆動する駆動部と、駆動部で作動するポンプ部とを有し、ポンプ部は、ピストンの直線往復運動で液体を吸入流路から吸入して吐出流路へ吐出するポンプ室と、吸入流路からポンプ室への液体の流れを許容しポンプ室から吸入流路への液体の流れを阻止する吸入チェック弁と、ポンプ室から吐出流路への液体の流れを許容し吐出流路からポンプ室への液体の流れを阻止する吐出チェック弁とを有し、吸入チェック弁と吐出チェック弁の少なくとも一方は、帯板によって形成される略環状形状で、帯板は、自己の弾性力で閉作動し、ピストンと略同軸心上に配置すると共に、内周面をピストンの外周面と間隙を有して配置し、軸方向両端に周方向へ複数の凸部を有した。 In order to achieve this problem, the present invention has taken the following measures. That is, in a hydraulic pump that reciprocates a piston linearly to suck and discharge liquid, it has a drive unit that drives the piston and a pump unit that operates by the drive unit. A pump chamber that sucks water from the suction flow path and discharges it to the discharge flow path, and a suction check valve that allows the flow of liquid from the suction flow path to the pump chamber and blocks the flow of liquid from the pump chamber to the suction flow path. It has a discharge check valve that allows the flow of liquid from the pump chamber to the discharge flow path and blocks the flow of liquid from the discharge flow path to the pump chamber, and at least one of the suction check valve and the discharge check valve is a band. In a substantially annular shape formed by the plate, the strip is closed by its own elastic force and is arranged substantially coaxially with the piston, and the inner peripheral surface is arranged with a gap from the outer peripheral surface of the piston. , It had a plurality of convex portions in the circumferential direction at both ends in the axial direction .

この場合、前記吸入チェック弁は、前記帯板によって形成される略環状形状で、帯板は、自己の弾性力で閉作動し、前記ピストンと略同軸心上に配置すると共に、内周面を前記ピストンの外周面と間隙を有して配置したものであって、前記ポンプ室と前記吸入流路との間に配置し、前記吸入チェック弁の外周面を前記吸入流路の前記ポンプ室への開口端に当接して、前記ポンプ室から前記吸入流路への液体の流れを阻止する閉状態と、閉状態から縮径して、前記吸入流路から前記ポンプ室へ液体の流れを許容する開状態とを有してもよい。また、前記吐出チェック弁は、前記帯板によって形成される略環状形状で、帯板は、自己の弾性力で閉作動し、前記ピストンと略同軸心上に配置すると共に、内周面を前記ピストンの外周面と間隙を有して配置したものであって、前記ポンプ室と前記吐出流路との間に配置し、前記吐出チェック弁の内周面を前記吐出流路の前記ポンプ室への開口端に当接して、前記吐出流路から前記ポンプ室への液体の流れを阻止する閉状態と、閉状態から拡径して、前記ポンプ室から前記吐出流路への液体の流れを許容する開状態を有してもよい。また、前記帯板は、周方向両端に第１端部および第２端部を有し、第１端部と第２端部との間には間隙を有してもよい。また、前記帯板は、軸方向中間部に連通穴を有してもよい。前記液圧ポンプは、前記駆動部を通電により発生する吸引力で可動鉄心を摺動するソレノイド部とした電磁ポンプとしてもよい。 In this case, the suction check valve has a substantially annular shape formed by the strip, and the strip is closed by its own elastic force, is arranged substantially coaxially with the piston, and has an inner peripheral surface. It is arranged with a gap from the outer peripheral surface of the piston, is arranged between the pump chamber and the suction flow path, and the outer peripheral surface of the suction check valve is arranged in the pump chamber of the suction flow path. The closed state that abuts on the open end of the pump chamber to prevent the flow of liquid from the pump chamber to the suction flow path, and the diameter is reduced from the closed state to allow the flow of liquid from the suction flow path to the pump chamber. It may have an open state. Further, the discharge check valve has a substantially annular shape formed by the strip, and the strip is closed by its own elastic force, is arranged substantially coaxially with the piston, and has an inner peripheral surface. It is arranged with a gap from the outer peripheral surface of the piston, and is arranged between the pump chamber and the discharge flow path, and the inner peripheral surface of the discharge check valve is placed in the pump chamber of the discharge flow path. A closed state that abuts on the open end of the pump chamber to prevent the flow of liquid from the discharge flow path to the pump chamber, and an enlarged diameter from the closed state to allow the flow of liquid from the pump chamber to the discharge flow path. It may have an acceptable open state. Further, the strip may have a first end portion and a second end portion at both ends in the circumferential direction, and may have a gap between the first end portion and the second end portion. Further, the strip may have a communication hole in the intermediate portion in the axial direction. The hydraulic pump may be an electromagnetic pump in which the drive portion is a solenoid portion that slides a movable iron core by an attractive force generated by energization.

以上詳述したように、吸入チェック弁と吐出チェック弁の少なくとも一方は、帯板によって形成される略環状形状で、帯板は、自己の弾性力で閉作動し、ピストンと略同軸心上に配置すると共に、内周面をピストンの外周面と間隙を有して配置した。このため、吸入チェック弁および／または吐出チェック弁の内周面とピストンの外周面は当接しないから、ピストンに吸入チェック弁および／または吐出チェック弁による摺動抵抗は生じず、ピストンの作動応答性を向上できる。また、吸入チェック弁および／または吐出チェック弁は、帯板が自己の弾性力で閉作動するから、弁体を弁座に着座する方向に弾性部材で付勢して閉作動するチェック弁を用いる従来液圧ポンプに比し、弾性部材が不要で、部品点数を低減できる。また、吸入チェック弁と吐出チェック弁をいずれも、薄板状の弁体を自己の弾性力で閉作動する板ばね弁としても課題達成を図れるが、このものに比し、吸入流路および／または吐出流路のポンプ室への開口を周方向に大きく設け、吸入流路および／または吐出流路のポンプ室への開口面積を大きく設定することができるから、大流量を流通することができる。また、帯板は、自己の弾性力を有し、金属材によって形成することが可能で、摩耗を抑制して長寿命化を図ることができる。また、帯板は、軸方向両端に周方向へ有した複数の凸部で、周方向への回転を規制することができる。 As described in detail above, at least one of the suction check valve and the discharge check valve has a substantially annular shape formed by the strip, and the strip is closed by its own elastic force and is substantially coaxial with the piston. In addition to the arrangement, the inner peripheral surface was arranged with a gap from the outer peripheral surface of the piston. Therefore, since the inner peripheral surface of the suction check valve and / or the discharge check valve does not abut on the outer peripheral surface of the piston, the piston does not have sliding resistance due to the suction check valve and / or the discharge check valve, and the operating response of the piston does not occur. You can improve your sex. Further, as the suction check valve and / or the discharge check valve, since the band plate closes by its own elastic force, a check valve that closes by urging the valve body with an elastic member in the direction of seating on the valve seat is used. Compared to conventional hydraulic pumps, elastic members are not required and the number of parts can be reduced. In addition, both the suction check valve and the discharge check valve can achieve the problem as a leaf spring valve that closes the thin plate-shaped valve body by its own elastic force, but compared to this, the suction flow path and / or Since a large opening of the discharge flow path to the pump chamber can be provided in the circumferential direction and a large opening area of the suction flow path and / or the discharge flow path to the pump chamber can be set, a large flow rate can be circulated. Further, the strip has its own elastic force and can be formed of a metal material, so that wear can be suppressed and the life can be extended. Further, the strip has a plurality of convex portions held in the circumferential direction at both ends in the axial direction, and can regulate the rotation in the circumferential direction.

また、請求項２に記載の発明は、吸入チェック弁は、帯板によって形成される略環状形状で、帯板は、自己の弾性力で閉作動し、ピストンと略同軸心上に配置すると共に、内周面をピストンの外周面と間隙を有して配置したものであって、ポンプ室と吸入流路との間に配置し、吸入チェック弁の外周面を吸入流路のポンプ室への開口端に当接して、ポンプ室から吸入流路への液体の流れを阻止する閉状態と、閉状態から縮径して、吸入流路からポンプ室へ液体の流れを許容する開状態とを有した。このため、帯板の外周面が、吸入流路のポンプ室への開口端に当接して閉作動し、離脱して開作動するから、ピストンの外周面がカップシールに摺動して開閉作動する従来液圧ポンプに比し、吸入チェック弁は耐久性を向上することができる。 Further, in the invention according to claim 2, the suction check valve has a substantially annular shape formed by a strip, and the strip is closed by its own elastic force and is arranged substantially coaxially with the piston. , The inner peripheral surface is arranged with a gap from the outer peripheral surface of the piston, and is arranged between the pump chamber and the suction flow path, and the outer peripheral surface of the suction check valve is arranged to the pump chamber of the suction flow path. A closed state that abuts on the open end and blocks the flow of liquid from the pump chamber to the suction flow path, and an open state that reduces the diameter from the closed state and allows the flow of liquid from the suction flow path to the pump chamber. Had. For this reason, the outer peripheral surface of the strip comes into contact with the opening end of the suction flow path to the pump chamber to close and open, and the outer peripheral surface of the piston slides on the cup seal to open and close. Compared to conventional hydraulic pumps, suction check valves can improve durability.

また、請求項３に記載の発明は、吐出チェック弁は、帯板によって形成される略環状形状で、帯板は、自己の弾性力で閉作動し、ピストンと略同軸心上に配置すると共に、内周面をピストンの外周面と間隙を有して配置したものであって、ポンプ室と吐出流路との間に配置し、吐出チェック弁の内周面を吐出流路のポンプ室への開口端に当接して、吐出流路からポンプ室への液体の流れを阻止する閉状態と、閉状態から拡径して、ポンプ室から吐出流路への液体の流れを許容する開状態を有した。このため、帯板の内周面が、吐出流路のポンプ室への開口端に当接して閉作動し、離脱して開作動するから、ピストンの外周面にカップシールが摺動して開閉作動する従来液圧ポンプに比し、吐出チェック弁は耐久性を向上することができる。 Further, in the invention according to claim 3, the discharge check valve has a substantially annular shape formed by a strip, and the strip is closed by its own elastic force and is arranged substantially coaxially with the piston. , The inner peripheral surface is arranged with a gap from the outer peripheral surface of the piston, and is arranged between the pump chamber and the discharge flow path, and the inner peripheral surface of the discharge check valve is arranged in the pump chamber of the discharge flow path. A closed state that blocks the flow of liquid from the discharge flow path to the pump chamber by abutting on the open end of the Had. For this reason, the inner peripheral surface of the strip comes into contact with the opening end of the discharge flow path to the pump chamber to close and open, and the cup seal slides on the outer peripheral surface of the piston to open and close. Compared to the conventional hydraulic pump that operates, the discharge check valve can improve the durability.

また、請求項４に記載の発明は、帯板は、周方向両端に第１端部および第２端部を有し、第１端部と第２端部との間には間隙を有した。このため、第１端部と第２端部は重なり合わないで、帯板が吸入流路および吐出流路のポンプ室への開口端に密着するから、液体の漏れを低減できる。 Further, in the invention according to claim 4, the strip has a first end portion and a second end portion at both ends in the circumferential direction, and has a gap between the first end portion and the second end portion. .. Therefore, the first end portion and the second end portion do not overlap with each other, and the strips are in close contact with the open ends of the suction flow path and the discharge flow path to the pump chamber, so that liquid leakage can be reduced.

また、請求項５に記載の発明は、帯板は、軸方向中間部に連通穴を有した。このため、液体は帯板の連通穴を介してポンプ室へ流入または流出するから、液体の流れ抵抗を低減できる。 Further, in the invention according to claim 5, the strip has a communication hole in the intermediate portion in the axial direction. Therefore, since the liquid flows in or out of the pump chamber through the communication hole of the strip, the flow resistance of the liquid can be reduced.

また、請求項６に記載の発明は、液圧ポンプは、駆動部を通電により発生する吸引力で可動鉄心を摺動するソレノイド部とした電磁ポンプとした。このため、電磁ポンプは可動鉄心の摺動でピストンを直線往復運動するから、電動機を駆動部とする液圧ポンプに比し、電動機の回転運動をピストンの直線往復運動に変換する格別の機構が不要で、容易に製作することができる。 Further, according to the sixth aspect of the present invention, the hydraulic pump is an electromagnetic pump in which the drive portion is a solenoid portion that slides the movable iron core by the suction force generated by energization. For this reason, since the electromagnetic pump reciprocates the piston linearly by sliding the movable iron core, there is a special mechanism that converts the rotational motion of the electric motor into the linear reciprocating motion of the piston compared to the hydraulic pump that uses the electric motor as the drive unit. It is unnecessary and can be easily manufactured.

本発明の一実施形態を示した液圧ポンプの縦断面図である。It is a vertical sectional view of the hydraulic pump which showed one Embodiment of this invention. 図１の吸入チェック弁の展開図である。It is a development view of the suction check valve of FIG. 図１の吐出チェック弁の平面図である。It is a top view of the discharge check valve of FIG. 図１の変形例を示した縦断面図である。It is a vertical sectional view which showed the modification of FIG. 本発明の他の実施形態を示した縦断面図である。It is a vertical sectional view which showed the other embodiment of this invention. 図４の吸入チェック弁の平面図である。It is a top view of the suction check valve of FIG. 図４の吐出チェック弁の展開図である。It is a development view of the discharge check valve of FIG.

以下、本発明の一実施形態を図面に基づき説明する。
図１ないし図３において、１は液圧ポンプとしての電磁ポンプで、駆動部としてのソレノイド部２への通電、非通電での繰り返しでポンプ部３を駆動して、液体としての作動油を吸入吐出する。 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
In FIGS. 1 to 3, reference numeral 1 denotes an electromagnetic pump as a hydraulic pump, which drives the pump unit 3 by repeatedly energizing and de-energizing the solenoid unit 2 as a driving unit to suck hydraulic oil as a liquid. Discharge.

４は略円筒形状のヨークで、中心に有底の収装孔４Ａを穿設すると共に、収装孔４Ａの径方向外方に有底の環状孔４Ｂを穿設している。ヨーク４は、軸方向一端側に開口部４Ｃを有する。５は略円筒形状の可動鉄心で、ヨーク４の収装孔４Ａに軸方向へ摺動自在に嵌挿している。可動鉄心５は軸方向へ大径孔５Ａ、小径孔５Ｂ、大径孔５Ｃを連設している。可動鉄心５の大径孔５Ａは、一側面に開口すると共に、可動鉄心５の大径孔５Ｃは、他側面に開口している。６は可動鉄心５の大径孔５Ａに収容した第１ばね部材で、ヨーク４の収装孔４Ａの底部と可動鉄心５の大径孔５Ａと小径孔５Ｂとの連設段部との間に介装し、可動鉄心５を軸方向下方に付勢する。７は略円盤形状の固定鉄心で、可動鉄心６を挿通する貫通孔７Ａを有する。８はヨーク４の環状孔４Ｂに収容したコイルボビンで、中心に軸方向へ貫通する挿通孔８Ａを有すると共に、軸方向両端に有した鍔部の間にコイル９を巻回している。コイルボビン８は、挿通孔８Ａの一端側から固定鉄心７を挿通し、コイル９への通電により発生する吸引力で、可動鉄心６を固定鉄心７に吸引する。 Reference numeral 4 denotes a substantially cylindrical yoke, in which a bottomed accommodating hole 4A is bored in the center and a bottomed annular hole 4B is bored outward in the radial direction of the accommodating hole 4A. The yoke 4 has an opening 4C on one end side in the axial direction. Reference numeral 5 denotes a movable iron core having a substantially cylindrical shape, which is slidably fitted in the accommodating hole 4A of the yoke 4 in the axial direction. The movable iron core 5 has a large diameter hole 5A, a small diameter hole 5B, and a large diameter hole 5C connected in series in the axial direction. The large-diameter hole 5A of the movable iron core 5 is open on one side surface, and the large-diameter hole 5C of the movable iron core 5 is open on the other side surface. Reference numeral 6 is a first spring member housed in the large-diameter hole 5A of the movable iron core 5. Between the bottom of the accommodating hole 4A of the yoke 4 and the continuous step portion between the large-diameter hole 5A and the small-diameter hole 5B of the movable iron core 5. The movable iron core 5 is urged downward in the axial direction. Reference numeral 7 is a fixed core having a substantially disk shape, and has a through hole 7A through which the movable core 6 is inserted. Reference numeral 8 denotes a coil bobbin housed in the annular hole 4B of the yoke 4, which has an insertion hole 8A penetrating in the axial direction at the center and winds the coil 9 between the flange portions provided at both ends in the axial direction. The coil bobbin 8 inserts the fixed iron core 7 from one end side of the insertion hole 8A, and sucks the movable iron core 6 into the fixed iron core 7 by the suction force generated by energizing the coil 9.

１０はポンプ部３のポンプ本体で、一端側に形成した凸部１０Ａを固定鉄心７の貫通孔７Ａに嵌合し、ヨーク４の開口部４Ｃにかしめにより連結する。ポンプ本体１０は、凸部１０Ａの反対側となる他端側に形成した装着部１０Ｂを被取付部１１の収装孔１１Ａに挿通し、図示しない複数のボルト部材で着脱自在に固定している。また、ポンプ本体１０は、軸方向に大径孔１０Ｃと小径孔１０Ｄを連設している。ポンプ本体１０の装着部１０Ｂは、Ｏリング１２Ａ、１２Ｂを外嵌し、装着部１０Ｂと被取付部１１の収装孔１１Ａとの隙間を液密的に密封している。また、ポンプ本体１０の装着部１０Ｂは、Ｏリング１２ＡとＯリング１２Ｂの間に外周面を窪ませて環状溝１３を形成している。 Reference numeral 10 is a pump body of the pump portion 3, in which the convex portion 10A formed on one end side is fitted into the through hole 7A of the fixed iron core 7 and connected to the opening 4C of the yoke 4 by caulking. In the pump main body 10, the mounting portion 10B formed on the other end side opposite to the convex portion 10A is inserted into the storage hole 11A of the mounted portion 11 and is detachably fixed by a plurality of bolt members (not shown). .. Further, the pump main body 10 has a large diameter hole 10C and a small diameter hole 10D connected in series in the axial direction. The mounting portion 10B of the pump main body 10 has O-rings 12A and 12B fitted externally, and the gap between the mounting portion 10B and the storage hole 11A of the mounted portion 11 is hermetically sealed. Further, the mounting portion 10B of the pump main body 10 has an annular groove 13 formed by recessing the outer peripheral surface between the O-ring 12A and the O-ring 12B.

１４は略円柱形状のピストンで、一端を可動鉄心５の小径孔５Ｃに圧入して着脱不能に固着し、他端をポンプ本体１０の小径孔１０Ｄに摺動自在に嵌挿している。１５はポンプ本体１０の大径孔１０Ｃに収容した第２ばね部材で、可動鉄心５の小径孔５Ｂと大径孔５Ｃとの連設段部とポンプ本体１０の大径孔１０Ｃと小径孔１０Ｄとの連設段部との間に介装し、可動鉄心５を軸方向上方に付勢する。可動鉄心５は、第１ばね部材６の弾性力と第２ばね部材１５の弾性力とが対向作用し、第１ばね部材６と第２ばね部材１５の弾性力の平衡位置で停止する。 Reference numeral 14 denotes a substantially cylindrical piston, one end of which is press-fitted into the small-diameter hole 5C of the movable iron core 5 so as to be non-detachably fixed, and the other end of which is slidably inserted into the small-diameter hole 10D of the pump body 10. Reference numeral 15 is a second spring member housed in the large-diameter hole 10C of the pump body 10. The continuous step portion of the small-diameter hole 5B and the large-diameter hole 5C of the movable iron core 5, the large-diameter hole 10C and the small-diameter hole 10D of the pump body 10 The movable iron core 5 is urged upward in the axial direction by interposing it between the and the continuous step portion. In the movable iron core 5, the elastic force of the first spring member 6 and the elastic force of the second spring member 15 act in opposition to each other, and the movable iron core 5 stops at the equilibrium position of the elastic forces of the first spring member 6 and the second spring member 15.

１６はピストン１４の軸方向下方に区画形成したポンプ室で、ポンプ本体１０の小径孔１０Ｄに連設している。１７は被取付部１１に穿設した第１流路で、一端を図示しないタンクに接続し、他端をポンプ本体１０の環状溝１３に接続している。１８は第１流路１７とポンプ本体１０の環状溝１３から構成する吸入流路で、タンクからポンプ室１６へ作動油を流入する。１９はポンプ本体１０に形成した４個の接続流路で、ポンプ室１６と吸入流路１８を構成する環状溝１３とを接続し、ポンプ室１６への開口端１９Ａを４個有する。２０は被取付部１１に穿設した第２流路で、一端を図示しないアクチュエータに接続し、他端を被取付部１１の収装孔１１Ａに接続している。２１は被取付部１１の収装孔１１Ａと第２流路２０から構成する吐出流路で、ポンプ室１６からアクチュエータへ作動油を流出する。 Reference numeral 16 denotes a pump chamber formed in a section below the axial direction of the piston 14, which is continuously provided in the small diameter hole 10D of the pump main body 10. Reference numeral 17 denotes a first flow path formed in the attached portion 11, one end of which is connected to a tank (not shown) and the other end of which is connected to the annular groove 13 of the pump body 10. Reference numeral 18 is a suction flow path composed of a first flow path 17 and an annular groove 13 of the pump body 10, and hydraulic oil flows from the tank into the pump chamber 16. Reference numeral 19 denotes four connecting flow paths formed in the pump main body 10, connecting the pump chamber 16 and the annular groove 13 constituting the suction flow path 18, and having four opening ends 19A to the pump chamber 16. Reference numeral 20 is a second flow path formed in the attached portion 11, one end of which is connected to an actuator (not shown) and the other end of which is connected to the accommodating hole 11A of the attached portion 11. Reference numeral 21 denotes a discharge flow path composed of a storage hole 11A of the mounted portion 11 and a second flow path 20, and hydraulic oil flows out from the pump chamber 16 to the actuator.

２２は略環状形状のばね用鋼板から成る帯板によって形成した吸入チェック弁で、ポンプ室１６と吸入流路１８との間に、内周面をピストン１４の外周面と間隙を有して配置すると共に、自己の弾性力で外周面を接続流路１９の開口端１９Ａに密着している。吸入チェック弁２２は、外周面を接続流路１９の開口端１９Ａに密着してポンプ室１６から吸入流路１８への作動油の流れを阻止する閉状態と、閉状態から縮径して、吸入流路１８からポンプ室１６への作動油の流れを許容する開状態とを有する。図２に示す如く、吸入チェック弁２２は、周方向両端に第１端部２２Ａおよび第２端部２２Ｂを有し、第１端部２２Ａと第２端部２２Ｂとの間には間隙を有している。また、吸入チェック弁２２は、軸方向両端に周方向へ複数の凸部２２Ｃを有すると共に、軸方向中間部に吸入流路１８からポンプ室１６へ作動油を流入する連通穴２２Ｄを有している。２３はポンプ室１６の軸方向一端側に圧入した略円筒形状の止め部材で、軸方向一端側に２個の凸部２３Ａ（１個は図示せず）を突設している。止め部材２３の２個の凸部２３Ａ（１個は図示せず）は、径方向に対向して配置している。一方の凸部２３Ａは、吸入チェック弁２２の両端部２２Ａ、２２Ｂの間の間隙に係合すると共に、他方の凸部は、吸入チェック弁２２の２個の凸部２２Ｃの間に係合して、吸入チェック弁２２の周方向への回転を規制している。 Reference numeral 22 denotes a suction check valve formed of a strip made of a substantially annular spring steel plate, and the inner peripheral surface is arranged between the pump chamber 16 and the suction flow path 18 with a gap from the outer peripheral surface of the piston 14. At the same time, the outer peripheral surface is brought into close contact with the open end 19A of the connecting flow path 19 by its own elastic force. The suction check valve 22 has a closed state in which the outer peripheral surface is brought into close contact with the open end 19A of the connecting flow path 19 to prevent the flow of hydraulic oil from the pump chamber 16 to the suction flow path 18, and the diameter is reduced from the closed state. It has an open state that allows the flow of hydraulic oil from the suction flow path 18 to the pump chamber 16. As shown in FIG. 2, the suction check valve 22 has a first end portion 22A and a second end portion 22B at both ends in the circumferential direction, and has a gap between the first end portion 22A and the second end portion 22B. is doing. Further, the suction check valve 22 has a plurality of convex portions 22C in the circumferential direction at both ends in the axial direction, and also has a communication hole 22D in which hydraulic oil flows from the suction flow path 18 into the pump chamber 16 in the intermediate portion in the axial direction. There is. Reference numeral 23 denotes a substantially cylindrical stopping member press-fitted to one end side in the axial direction of the pump chamber 16, and two convex portions 23A (one not shown) are projected on one end side in the axial direction. The two convex portions 23A (one not shown) of the stop member 23 are arranged so as to face each other in the radial direction. One convex portion 23A engages in the gap between both ends 22A and 22B of the suction check valve 22, and the other convex portion engages between the two convex portions 22C of the suction check valve 22. Therefore, the rotation of the suction check valve 22 in the circumferential direction is restricted.

２４はポンプ室１６に連設した収容孔で、軸方向一端側に開口部２４Ａを有する。２５は略円形で薄板状の板ばね２６と略円柱形状の固定部材２７から構成する吐出チェック弁で、収容孔２４に収容し、収容孔２４の開口部２４Ａをかしめてポンプ本体１０に固定している。図３に示す如く、板ばね２６は、略環状の本体部２６Ａと本体部２６Ａの径方向内方に配置した略円形状の弁体２６Ｂとを接続部２６Ｃを介して連結している。固定部材２７は、一側面と収容孔２４の底部とで板ばね２６の本体部２６Ａを挟持して固定している。また、固定部材２７は、複数の接続流路２７Ａを軸方向に穿設し、ポンプ室１６と吐出流路２１を構成する取付部材１１の収容孔１１Ａとを接続している。吐出チェック弁２５は、自己の弾性力で弁体２６Ｂを収容孔２４とポンプ室１６の接続箇所に形成した弁座２８に当接して、吐出流路２１からポンプ室１６への作動油の流れを阻止する閉状態と、弁体２６Ｂを弁座２８から離脱して、ポンプ室１６から吐出流路２１への作動油の流れを許容する開状態を有する。 Reference numeral 24 denotes an accommodating hole continuously provided in the pump chamber 16, which has an opening 24A on one end side in the axial direction. Reference numeral 25 denotes a discharge check valve composed of a substantially circular and thin plate-shaped leaf spring 26 and a substantially cylindrical fixing member 27, which is accommodated in the accommodating hole 24 and is fixed to the pump body 10 by caulking the opening 24A of the accommodating hole 24. ing. As shown in FIG. 3, the leaf spring 26 connects a substantially annular main body portion 26A and a substantially circular valve body 26B arranged radially inward of the main body portion 26A via a connecting portion 26C. The fixing member 27 sandwiches and fixes the main body portion 26A of the leaf spring 26 between one side surface and the bottom portion of the accommodating hole 24. Further, the fixing member 27 has a plurality of connection flow paths 27A bored in the axial direction to connect the pump chamber 16 and the accommodation hole 11A of the mounting member 11 constituting the discharge flow path 21. The discharge check valve 25 abuts the valve body 26B on the valve seat 28 formed at the connection point between the accommodating hole 24 and the pump chamber 16 by its own elastic force, and the hydraulic oil flows from the discharge flow path 21 to the pump chamber 16. It has a closed state in which the valve body 26B is separated from the valve seat 28 and an open state in which the hydraulic oil is allowed to flow from the pump chamber 16 to the discharge flow path 21.

次に、かかる構成の作動を説明する。
図１は、コイル９の非通電状態を示し、可動鉄心５は第１ばね部材６と第２ばね部材１５の弾性力の平衡位置で停止している。吸入チェック弁２２および吐出チェック弁２５は閉状態である。 Next, the operation of such a configuration will be described.
FIG. 1 shows a non-energized state of the coil 9, and the movable iron core 5 is stopped at an equilibrium position of elastic forces of the first spring member 6 and the second spring member 15. The suction check valve 22 and the discharge check valve 25 are in the closed state.

この状態で、コイル９へ通電すると、可動鉄心５は第２ばね部材１５の弾性力に抗して軸方向下方へ摺動して固定鉄心７に吸引される。これにより、ピストン１４がポンプ室１６の作動油を加圧し、吐出チェック弁２５が開状態となり、ポンプ室１６から吐出流路２１を介して作動油をアクチュエータに吐出する。吸入チェック弁２２は、閉状態を維持している。 When the coil 9 is energized in this state, the movable core 5 slides downward in the axial direction against the elastic force of the second spring member 15 and is attracted to the fixed core 7. As a result, the piston 14 pressurizes the hydraulic oil in the pump chamber 16, the discharge check valve 25 is opened, and the hydraulic oil is discharged from the pump chamber 16 to the actuator via the discharge flow path 21. The suction check valve 22 is maintained in a closed state.

この状態で、コイル９を非通電にすると、可動鉄心５は第２ばね部材１５の弾性力で軸方向上方へ摺動して固定鉄心７から離間する。これにより、ポンプ室１６はピストン１４が上方へ移動し負圧になる。そして、吸入チェック弁２２は、閉状態から縮径して開状態となり、タンクから吸入流路１８および接続流路１９介して作動油をポンプ室１６に吸入する。吐出チェック弁２４は、自己の弾性力で閉状態となる。 When the coil 9 is de-energized in this state, the movable core 5 slides upward in the axial direction due to the elastic force of the second spring member 15 and separates from the fixed core 7. As a result, in the pump chamber 16, the piston 14 moves upward and becomes a negative pressure. Then, the suction check valve 22 is reduced in diameter from the closed state to the open state, and the hydraulic oil is sucked from the tank into the pump chamber 16 through the suction flow path 18 and the connection flow path 19. The discharge check valve 24 is closed by its own elastic force.

かかる作動において、吸入チェック弁２２は、帯板によって形成される略環状形状で、帯板は、自己の弾性力で閉作動し、ピストン１４と略同軸心上に配置すると共に、内周面をピストン１４の外周面と間隙を有して配置した。このため、吸入チェック弁２２の内周面とピストン１４の外周面は当接しないから、ピストン１４に吸入チェック弁２２による摺動抵抗は生じず、ピストン１４の作動応答性を向上できる。また、吸入チェック弁２２は、帯板が自己の弾性力で閉作動するから、弁体を弁座に着座する方向に弾性部材で付勢して閉作動するチェック弁を用いる従来液圧ポンプに比し、弾性部材が不要で、部品点数を低減できる。また、吸入チェック弁と吐出チェック弁をいずれも、薄板状の弁体を自己の弾性力で閉作動する板ばね弁としても課題達成を図れるが、このものに比し、吸入流路１８のポンプ室１６への開口を周方向に大きく設け、吸入流路１８のポンプ室１６への開口面積を大きく設定することができるから、大流量を流通することができる。また、帯板は、自己の弾性力を有するばね用鋼板によって形成されるから、摩耗を抑制して長寿命化を図ることができる。 In such an operation, the suction check valve 22 has a substantially annular shape formed by the strip, and the strip is closed by its own elastic force, is arranged substantially coaxially with the piston 14, and has an inner peripheral surface. It was arranged with a gap from the outer peripheral surface of the piston 14. Therefore, since the inner peripheral surface of the suction check valve 22 and the outer peripheral surface of the piston 14 do not come into contact with each other, sliding resistance due to the suction check valve 22 does not occur on the piston 14, and the operational responsiveness of the piston 14 can be improved. Further, since the suction check valve 22 is closed by its own elastic force, the suction check valve 22 is a conventional hydraulic pump using a check valve that is urged by an elastic member in the direction in which the valve body is seated on the valve seat and is closed. In comparison, no elastic member is required and the number of parts can be reduced. Further, both the suction check valve and the discharge check valve can be used as a leaf spring valve that closes the thin plate-shaped valve body by its own elastic force, but the problem can be achieved. Since a large opening to the chamber 16 can be provided in the circumferential direction and a large opening area of the suction flow path 18 to the pump chamber 16 can be set, a large flow rate can be circulated. Further, since the strip is formed of a spring steel plate having its own elastic force, wear can be suppressed and the life can be extended.

また、吸入チェック弁２２は、ポンプ室１６と吸入流路１８との間に配置し、吸入チェック弁２２の外周面を吸入流路１８と接続する接続流路１９のポンプ室１６への開口端１９Ａに当接して、ポンプ室１６から吸入流路１８への作動油の流れを阻止する閉状態と、閉状態から縮径して、吸入流路１８からポンプ室１６への作動油の流れを許容する開状態とを有した。このため、吸入チェック弁２２の帯板の外周面が、吸入流路１８のポンプ室１６への開口端１９Ａに当接して閉作動し、離脱して開作動するから、ピストンの外周面がカップシールに摺動して開閉作動する従来液圧ポンプに比し、吸入チェック弁２２は耐久性を向上することができる。 Further, the suction check valve 22 is arranged between the pump chamber 16 and the suction flow path 18, and the opening end of the connection flow path 19 connecting the outer peripheral surface of the suction check valve 22 to the suction flow path 18 to the pump chamber 16. A closed state that abuts on 19A to prevent the flow of hydraulic oil from the pump chamber 16 to the suction flow path 18, and a reduced diameter from the closed state to prevent the flow of hydraulic oil from the suction flow path 18 to the pump chamber 16. It had an acceptable open state. Therefore, the outer peripheral surface of the strip of the suction check valve 22 abuts on the opening end 19A of the suction flow path 18 to the pump chamber 16 to close and open, and the outer peripheral surface of the piston is cupped. Compared with the conventional hydraulic pump that slides on the seal and opens and closes, the suction check valve 22 can improve the durability.

また、吸入チェック弁２２の帯板は、周方向両端に第１端部２２Ａおよび第２端部２２Ｂを有し、第１端部２２Ａと第２端部２２Ｂとの間には間隙を有した。このため、第１端部２２Ａと第２端部２２Ｂは重なり合わないで、帯板が吸入流路１８と接続する接続流路１９のポンプ室１６への開口端１９Ａに密着するから、作動油の漏れを低減できる。 Further, the strip of the suction check valve 22 has a first end portion 22A and a second end portion 22B at both ends in the circumferential direction, and has a gap between the first end portion 22A and the second end portion 22B. .. Therefore, the first end portion 22A and the second end portion 22B do not overlap with each other, and the strip is in close contact with the opening end 19A of the connection flow path 19 connected to the suction flow path 18 to the pump chamber 16. Leakage can be reduced.

また、吸入チェック弁２２の帯板は、軸方向中間部に連通穴２２Ｄを有した。このため、作動油は吸入チェック弁２２の帯板の連通穴２２Ｄを介してポンプ室１６へ流入するから、作動油の流れ抵抗を低減できる。 Further, the strip of the suction check valve 22 has a communication hole 22D in the intermediate portion in the axial direction. Therefore, since the hydraulic oil flows into the pump chamber 16 through the communication hole 22D of the strip of the suction check valve 22, the flow resistance of the hydraulic oil can be reduced.

また、液圧ポンプは、駆動部を通電により発生する吸引力で可動鉄心５を摺動するソレノイド部２とした電磁ポンプ１とした。このため、電磁ポンプ１は可動鉄心５の摺動でピストン１３を直線往復運動するから、電動機を駆動部とする液圧ポンプに比し、電動機の回転運動をピストンの直線往復運動に変換する格別の機構が不要で、容易に製作することができる。 Further, the hydraulic pump is an electromagnetic pump 1 in which the drive unit is a solenoid unit 2 that slides the movable iron core 5 by the suction force generated by energization. Therefore, since the electromagnetic pump 1 reciprocates the piston 13 linearly by sliding the movable iron core 5, the rotational motion of the electric motor is converted into the linear reciprocating motion of the piston as compared with the hydraulic pump using the electric motor as a drive unit. No mechanism is required and it can be easily manufactured.

図４は、一実施形態の他の変形例を示し、一実施形態と同一個所には同符号を付して説明を省略し、異なる個所についてのみ説明する。
図１ないし図３の吐出チェック弁２５に替えて、弁体２９と、ばね３０と、ばね受け部材３１から構成する吐出チェック弁３２を設けた。吐出チェック弁３２は、弁体２９をばね３０の弾性力で付勢して弁座２８に当接している。弁体２９は、略円盤形状で、周方向に軸方向へ穿設した複数の連通孔２９Ａを有している。ばね３０は、弁体２９とばね受け部材３１との間に介装している。ばね受け部材３１は、中心に軸方向へ貫通する貫通孔３１Ａを有する。３３は弁体２９の連通孔２９Ａと、収容孔２４と、ばね受け部材３１の貫通孔３１Ａから構成する接続流路で、ポンプ室１６と吐出流路２１を構成する被取付部１１の収装孔１１Ａを接続する。吐出チェック弁３２は、弁体２９が弁座２８に当接してポンプ室１６から吐出流路２１への作動油の流れを阻止する閉状態と、弁体２９が弁座２８から離脱してポンプ室１６から吐出流路２１への作動油の流れを許容する開状態とを有する。 FIG. 4 shows another modified example of one embodiment, and the same parts as those of one embodiment are designated by the same reference numerals, the description thereof will be omitted, and only different parts will be described.
Instead of the discharge check valve 25 of FIGS. 1 to 3, a discharge check valve 32 composed of a valve body 29, a spring 30, and a spring receiving member 31 is provided. The discharge check valve 32 urges the valve body 29 with the elastic force of the spring 30 to abut against the valve seat 28. The valve body 29 has a substantially disk shape and has a plurality of communication holes 29A drilled in the circumferential direction. The spring 30 is interposed between the valve body 29 and the spring receiving member 31. The spring receiving member 31 has a through hole 31A penetrating in the axial direction at the center. 33 is a connection flow path composed of a communication hole 29A of the valve body 29, an accommodating hole 24, and a through hole 31A of the spring receiving member 31, and accommodates the attached portion 11 constituting the pump chamber 16 and the discharge flow path 21. Connect the hole 11A. The discharge check valve 32 is in a closed state in which the valve body 29 abuts on the valve seat 28 to prevent the flow of hydraulic oil from the pump chamber 16 to the discharge flow path 21, and the valve body 29 separates from the valve seat 28 to pump. It has an open state that allows the flow of hydraulic oil from the chamber 16 to the discharge flow path 21.

図５ないし図７は、本発明の他の実施形態を示し、一実施形態と同一個所には同符号を付して説明を省略し、異なる個所についてのみ説明する。
３４はピストン１４の軸方向下方に形成したポンプ室で、ピストン１４とポンプ本体１０の小径孔１０Ｄにより区画形成している。３５は被取付部１１に穿設した第１流路で、一端を図示しないタンクに接続し、他端を被取付部１１の収装孔１１Ａに接続している。３６は第１流路３５と被取付部１１の収装孔１１Ａから構成する吸入流路で、タンクからポンプ室３４へ作動油を流入する。３７は被取付部１１に穿設した第２流路で、一端をポンプ本体１０の環状溝１３に接続し、他端を図示しないアクチュエータに接続している。３８はポンプ本体１０の環状溝１３と第２流路３７から構成する吐出流路で、ポンプ室３４からアクチュエータへ作動油を流出する。 5 to 7 show other embodiments of the present invention, the same parts as those in one embodiment are designated by the same reference numerals, the description thereof will be omitted, and only different parts will be described.
Reference numeral 34 denotes a pump chamber formed downward in the axial direction of the piston 14, which is partitioned by the piston 14 and the small diameter hole 10D of the pump body 10. Reference numeral 35 is a first flow path formed in the attached portion 11, one end of which is connected to a tank (not shown) and the other end of which is connected to the accommodating hole 11A of the attached portion 11. Reference numeral 36 denotes a suction flow path composed of a first flow path 35 and a storage hole 11A of the mounted portion 11, and hydraulic oil flows from the tank to the pump chamber 34. Reference numeral 37 is a second flow path formed in the attached portion 11, one end of which is connected to the annular groove 13 of the pump body 10 and the other end of which is connected to an actuator (not shown). Reference numeral 38 denotes a discharge flow path composed of the annular groove 13 of the pump main body 10 and the second flow path 37, and hydraulic oil flows out from the pump chamber 34 to the actuator.

３９はポンプ室３４に連設した段付き形状の収容孔で、軸方向一端側に開口部３９Ａを有する。４０は略円形で薄板状の板ばね４１と略円柱形状の固定部材４２から構成する吸入チェック弁で、収容孔３９に収容し、収容孔３９の開口部３９Ａをかしめてポンプ本体１０に固定している。板ばね４１は、図６に示す如く、略環状の本体部４１Ａと本体部４１Ａの径方向内方に配置した略円形状の弁体４１Ｂとを接続部４１Ｃを介して連結している。固定部材４２は、一側面と収容孔３９の段部とで板ばね４１の本体部４１Ａを挟持して固定している。また、固定部材４２は、中心に貫通孔４２Ａを有し、吸入流路３６を構成する取付部材１１の収装孔１１Ａとポンプ室３４を接続している。吸入チェック弁４０は、自己の弾性力で弁体４１Ｂを固定部材４２の貫通孔４２Ａのポンプ室３４側開口端に形成した弁座４３に当接して、ポンプ室３４から吸入流路３６への作動油の流れを阻止する閉状態と、弁体４１Ｂを弁座４３から離脱して、吸入流路３６からポンプ室３４への作動油の流れを許容する開状態を有する。 Reference numeral 39 denotes a stepped accommodating hole continuously provided in the pump chamber 34, which has an opening 39A on one end side in the axial direction. Reference numeral 40 denotes a suction check valve composed of a substantially circular and thin plate-shaped leaf spring 41 and a substantially cylindrical fixing member 42, which is accommodated in the accommodating hole 39 and is fixed to the pump body 10 by caulking the opening 39A of the accommodating hole 39. ing. As shown in FIG. 6, the leaf spring 41 connects a substantially annular main body portion 41A and a substantially circular valve body 41B arranged inward in the radial direction of the main body portion 41A via a connecting portion 41C. The fixing member 42 sandwiches and fixes the main body portion 41A of the leaf spring 41 between one side surface and the step portion of the accommodating hole 39. Further, the fixing member 42 has a through hole 42A in the center, and connects the storage hole 11A of the mounting member 11 constituting the suction flow path 36 and the pump chamber 34. The suction check valve 40 abuts the valve body 41B on the valve seat 43 formed at the opening end of the through hole 42A of the fixing member 42 on the pump chamber 34 side by its own elastic force, and from the pump chamber 34 to the suction flow path 36. It has a closed state in which the flow of hydraulic oil is blocked and an open state in which the valve body 41B is separated from the valve seat 43 to allow the flow of hydraulic oil from the suction flow path 36 to the pump chamber 34.

４４はポンプ本体１０に形成した４個の接続流路で、ポンプ室３４と吐出流路３８を構成する環状溝１３を接続している。吐出流路３８は、接続流路４４との接続箇所にポンプ室３４への開口端３８Ａを４個有している。４５は略環状形状のばね用鋼板から成る帯板によって形成した吐出チェック弁で、ポンプ室３４と吐出流路３８との間に配置し、自己の弾性力で内周面を吐出流路３８の開口端３８Ａに密着している。吐出チェック弁４５は、内周面を吐出流路３８の開口端３８Ａに密着して吐出流路３８からポンプ室３４への作動油の流れを阻止する閉状態と、閉状態から拡径して、ポンプ室３４から吐出流路３８への作動油の流れを許容する開状態とを有する。図７に示す如く、吐出チェック弁４５は、周方向両端に第１端部４５Ａおよび第２端部４５Ｂを有し、第１端部４５Ａと第２端部４５Ｂとの間には間隙を有している。また、吐出チェック弁４５は、軸方向両端に周方向へ複数の凸部４５Ｃを有すると共に、軸方向中間部にポンプ室３４から吐出流路３８へ作動油を流出する連通穴４５Ｄと連通穴４５Ｄの下方に小径穴４５Ｅを有している。吐出チェック弁４５の小径穴４５Ｅは、ポンプ本体１０に固着する図示しない止め部材を挿通して、吐出チェック弁４５の周方向への回転を規制している。 Reference numeral 44 denotes four connecting flow paths formed in the pump main body 10, which connect the pump chamber 34 and the annular groove 13 constituting the discharge flow path 38. The discharge flow path 38 has four open ends 38A to the pump chamber 34 at the connection point with the connection flow path 44. Reference numeral 45 denotes a discharge check valve formed of a strip made of a substantially annular spring steel plate, which is arranged between the pump chamber 34 and the discharge flow path 38, and the inner peripheral surface of the discharge flow path 38 is provided by its own elastic force. It is in close contact with the open end 38A. The discharge check valve 45 has a closed state in which the inner peripheral surface is in close contact with the open end 38A of the discharge flow path 38 to prevent the flow of hydraulic oil from the discharge flow path 38 to the pump chamber 34, and the diameter is expanded from the closed state. It has an open state that allows the flow of hydraulic oil from the pump chamber 34 to the discharge flow path 38. As shown in FIG. 7, the discharge check valve 45 has a first end portion 45A and a second end portion 45B at both ends in the circumferential direction, and has a gap between the first end portion 45A and the second end portion 45B. is doing. Further, the discharge check valve 45 has a plurality of convex portions 45C in the circumferential direction at both ends in the axial direction, and at the intermediate portion in the axial direction, a communication hole 45D and a communication hole 45D for flowing hydraulic oil from the pump chamber 34 to the discharge flow path 38. It has a small diameter hole 45E below. The small diameter hole 45E of the discharge check valve 45 is inserted with a stop member (not shown) fixed to the pump body 10 to regulate the rotation of the discharge check valve 45 in the circumferential direction.

作動は、一実施形態と略同様に、図５の状態で、コイル９を通電すると、ピストン１４がポンプ室３４の作動油を加圧し、吐出チェック弁４５が開き、ポンプ室３４から吐出流路３８を介して作動油をアクチュエータに吐出する。この状態で、コイル９を非通電にすると、ポンプ室３４は負圧になり、吸入チェック弁４０は開き、タンクから吸入流路３６を介して作動油をポンプ室３４に吸入する。吐出チェック弁４５は、自己の弾性力で閉じる。 The operation is substantially the same as in one embodiment, when the coil 9 is energized in the state of FIG. 5, the piston 14 pressurizes the hydraulic oil in the pump chamber 34, the discharge check valve 45 opens, and the discharge flow path from the pump chamber 34. The hydraulic oil is discharged to the actuator via 38. When the coil 9 is de-energized in this state, the pump chamber 34 becomes a negative pressure, the suction check valve 40 opens, and hydraulic oil is sucked from the tank into the pump chamber 34 via the suction flow path 36. The discharge check valve 45 closes by its own elastic force.

かかる作動において、吐出チェック弁４５は、帯板によって形成される略環状形状で、帯板は、自己の弾性力で閉作動し、ピストン１４と略同軸心上に配置すると共に、内周面をピストンの外周面と間隙を有して配置した。このため、吐出チェック弁４５の内周面とピストン１４の外周面は当接しないから、ピストン１４に吐出チェック弁４５による摺動抵抗は生じず、ピストン１４の作動応答性を向上できる。また、吐出チェック弁４５は、帯板が自己の弾性力で閉作動するから、弁体を弁座に着座する方向に弾性部材で付勢して閉作動するチェック弁を用いる従来液圧ポンプに比し、弾性部材が不要で、部品点数を低減できる。また、吸入チェック弁と吐出チェック弁をいずれも、薄板状の弁体を自己の弾性力で閉作動する板ばね弁としても課題達成を図れるが、このものに比し、吐出流路３８のポンプ室３４への開口を周方向に大きく設け、吸入流路３８のポンプ室４５への開口面積を大きく設定することができるから、大流量を流通することができる。また、帯板は、自己の弾性力を有するばね用鋼板によって形成されるから、摩耗を抑制して長寿命化を図ることができる。 In such an operation, the discharge check valve 45 has a substantially annular shape formed by the strip, and the strip is closed by its own elastic force, is arranged substantially coaxially with the piston 14, and has an inner peripheral surface. It was arranged with a gap from the outer peripheral surface of the piston. Therefore, since the inner peripheral surface of the discharge check valve 45 and the outer peripheral surface of the piston 14 do not come into contact with each other, sliding resistance due to the discharge check valve 45 does not occur on the piston 14, and the operational responsiveness of the piston 14 can be improved. Further, since the discharge check valve 45 is closed by its own elastic force, the discharge check valve 45 is a conventional hydraulic pump using a check valve that is urged by an elastic member in the direction in which the valve body is seated on the valve seat and is closed. In comparison, no elastic member is required and the number of parts can be reduced. In addition, both the suction check valve and the discharge check valve can achieve the problem as a leaf spring valve that closes the thin plate-shaped valve body by its own elastic force, but compared to this, the pump of the discharge flow path 38 Since a large opening to the chamber 34 can be provided in the circumferential direction and a large opening area of the suction flow path 38 to the pump chamber 45 can be set, a large flow rate can be circulated. Further, since the strip is formed of a spring steel plate having its own elastic force, wear can be suppressed and the life can be extended.

また、吐出チェック弁４５は、ポンプ室３４と吐出流路３８との間に配置し、吐出チェック弁４５の内周面を吐出流路３８のポンプ室３４への開口端３８Ａに当接して、吐出流路３８からポンプ室３４への作動油の流れを阻止する閉状態と、閉状態から拡径して、ポンプ室３４から吐出流路３８への作動油の流れを許容する開状態を有した。このため、吐出チェック弁４５の帯板の内周面が、吐出流路３８のポンプ室３４への開口端３８Ａに当接して閉作動し、離脱して開作動するから、ピストンの外周面がカップシールに摺動して開閉作動する従来液圧ポンプに比し、吐出チェック弁４５は耐久性を向上することができる。 Further, the discharge check valve 45 is arranged between the pump chamber 34 and the discharge flow path 38, and the inner peripheral surface of the discharge check valve 45 is in contact with the opening end 38A of the discharge flow path 38 to the pump chamber 34. There is a closed state that blocks the flow of hydraulic oil from the discharge flow path 38 to the pump chamber 34, and an open state that allows the flow of hydraulic oil from the pump chamber 34 to the discharge flow path 38 by expanding the diameter from the closed state. did. Therefore, the inner peripheral surface of the strip of the discharge check valve 45 abuts on the opening end 38A of the discharge flow path 38 to the pump chamber 34 to close and open, and the outer peripheral surface of the piston opens. Compared with the conventional hydraulic pump that slides on the cup seal and opens and closes, the discharge check valve 45 can improve the durability.

また、一実施形態と略同様に、吐出チェック弁４５の第１端部４５Ａと第２端部４５Ｂは重なり合わないで、帯板が吐出流路３８のポンプ室３４への開口端３８Ａに密着するから、作動油の漏れを低減できる。また、作動油は吐出チェック弁４５の帯板の連通穴４５Ｄを介してポンプ室３４へ流入するから、作動油の流れ抵抗を低減できる。また、電磁ポンプ１は可動鉄心５の摺動でピストン１４を直線往復運動するから、電動機を駆動部とする液圧ポンプに比し、電動機の回転運動をピストンの直線往復運動に変換する格別の機構が不要で、容易に製作することができる。 Further, substantially the same as in one embodiment, the first end portion 45A and the second end portion 45B of the discharge check valve 45 do not overlap, and the strip plate is in close contact with the opening end 38A of the discharge flow path 38 to the pump chamber 34. Therefore, leakage of hydraulic oil can be reduced. Further, since the hydraulic oil flows into the pump chamber 34 through the communication hole 45D of the strip of the discharge check valve 45, the flow resistance of the hydraulic oil can be reduced. Further, since the electromagnetic pump 1 reciprocates the piston 14 linearly by sliding the movable iron core 5, the rotational motion of the electric motor is converted into the linear reciprocating motion of the piston as compared with the hydraulic pump using the electric motor as a drive unit. It does not require a mechanism and can be easily manufactured.

なお、前述の各実施形態では、吸入チェック弁と吐出チェック弁の少なくとも一方を帯板によって形成される略環状形状としたが、吸入チェック弁と吐出チェック弁のいずれも帯板によって形成される略環状形状としてもよい。また、接続流路１９、４４はそれぞれ複数設けたが、１個でもよい。また、液圧ポンプとしてソレノイド部２を駆動部とする電磁ポンプ１を用いたが、これに限らず、電動機を駆動部とするピストンポンプとしてもよい。また、他の実施形態では、板ばね４１と固定部材４２から構成した吸入チェック弁４０を用いたが、弁体を弁座に着座する方向に弾性部材で付勢して閉作動するチェック弁を用いてもよいことは勿論である。 In each of the above-described embodiments, at least one of the suction check valve and the discharge check valve has a substantially annular shape formed by the strip, but both the suction check valve and the discharge check valve are abbreviated to be formed by the strip. It may have an annular shape. Further, although a plurality of connection flow paths 19 and 44 are provided, one may be used. Further, although the electromagnetic pump 1 having the solenoid unit 2 as the driving unit is used as the hydraulic pump, the present invention is not limited to this, and a piston pump having an electric motor as the driving unit may be used. Further, in another embodiment, a suction check valve 40 composed of a leaf spring 41 and a fixing member 42 is used, but a check valve that is urged by an elastic member in the direction in which the valve body is seated on the valve seat and is closed. Of course, it may be used.

１：電磁ポンプ（液圧ポンプ）
２：ソレノイド部（駆動部）
３：ポンプ部
５：可動鉄心
１４：ピストン
１６、３４：ポンプ室
１８、３６：吸入流路
１９Ａ、３８Ａ：開口端
２１、３８：吐出流路
２２、４０：吸入チェック弁
２２Ａ、４５Ａ：第１端部
２２Ｂ、４５Ｂ：第２端部
２２Ｄ、４５Ｄ：連通穴
２５、４５：吐出チェック弁 1: Electromagnetic pump (hydraulic pump)
2: Solenoid part (drive part)
3: Pump part 5: Movable iron core 14: Piston 16, 34: Pump chamber 18, 36: Suction flow path 19A, 38A: End end 21, 38: Discharge flow path 22, 40: Suction check valve 22A, 45A: First Ends 22B, 45B: Second end 22D, 45D: Communication holes 25, 45: Discharge check valve

Claims

ピストンを直線往復運動して液体を吸入吐出する液圧ポンプにおいて、ピストンを駆動する駆動部と、駆動部で作動するポンプ部とを有し、ポンプ部は、ピストンの直線往復運動で液体を吸入流路から吸入して吐出流路へ吐出するポンプ室と、吸入流路からポンプ室への液体の流れを許容しポンプ室から吸入流路への液体の流れを阻止する吸入チェック弁と、ポンプ室から吐出流路への液体の流れを許容し吐出流路からポンプ室への液体の流れを阻止する吐出チェック弁とを有し、吸入チェック弁と吐出チェック弁の少なくとも一方は、帯板によって形成される略環状形状で、帯板は、自己の弾性力で閉作動し、ピストンと略同軸心上に配置すると共に、内周面をピストンの外周面と間隙を有して配置し、軸方向両端に周方向へ複数の凸部を有したことを特徴とする液圧ポンプ。 A hydraulic pump that reciprocates a piston linearly to suck and discharge liquid has a drive unit that drives the piston and a pump unit that operates by the drive unit, and the pump unit sucks and discharges liquid by the linear reciprocating motion of the piston. A pump chamber that sucks from the flow path and discharges it to the discharge flow path, a suction check valve that allows the flow of liquid from the suction flow path to the pump chamber and blocks the flow of liquid from the pump chamber to the suction flow path, and a pump. It has a discharge check valve that allows the flow of liquid from the chamber to the discharge flow path and blocks the flow of liquid from the discharge flow path to the pump chamber, and at least one of the suction check valve and the discharge check valve is provided with a strip. In the formed substantially annular shape, the strip is closed by its own elastic force and is arranged substantially coaxially with the pump, and the inner peripheral surface is arranged with a gap from the outer peripheral surface of the pump. A hydraulic pump characterized by having a plurality of convex portions in the circumferential direction at both ends of the direction .

前記吸入チェック弁は、前記帯板によって形成される略環状形状で、帯板は、自己の弾性力で閉作動し、前記ピストンと略同軸心上に配置すると共に、内周面を前記ピストンの外周面と間隙を有して配置したものであって、前記ポンプ室と前記吸入流路との間に配置し、前記吸入チェック弁の外周面を前記吸入流路の前記ポンプ室への開口端に当接して、前記ポンプ室から前記吸入流路への液体の流れを阻止する閉状態と、閉状態から縮径して、前記吸入流路から前記ポンプ室へ液体の流れを許容する開状態とを有することを特徴とする請求項１に記載の液圧ポンプ。 The suction check valve has a substantially annular shape formed by the strip, and the strip is closed by its own elastic force, is arranged substantially coaxially with the piston, and has an inner peripheral surface of the piston. It is arranged with a gap from the outer peripheral surface, and is arranged between the pump chamber and the suction flow path, and the outer peripheral surface of the suction check valve is the opening end of the suction flow path to the pump chamber. A closed state in which the liquid is blocked from flowing from the pump chamber to the suction flow path, and an open state in which the diameter is reduced from the closed state to allow the liquid to flow from the suction flow path to the pump chamber. The hydraulic pump according to claim 1, wherein the pump has.

前記吐出チェック弁は、前記帯板によって形成される略環状形状で、帯板は、自己の弾性力で閉作動し、前記ピストンと略同軸心上に配置すると共に、内周面を前記ピストンの外周面と間隙を有して配置したものであって、前記ポンプ室と前記吐出流路との間に配置し、前記吐出チェック弁の内周面を前記吐出流路の前記ポンプ室への開口端に当接して、前記吐出流路から前記ポンプ室への液体の流れを阻止する閉状態と、閉状態から拡径して、前記ポンプ室から前記吐出流路への液体の流れを許容する開状態を有することを特徴とする請求項１に記載の液圧ポンプ。 The discharge check valve has a substantially annular shape formed by the strip, and the strip is closed by its own elastic force, is arranged substantially coaxially with the piston, and has an inner peripheral surface of the piston. It is arranged with a gap from the outer peripheral surface, and is arranged between the pump chamber and the discharge flow path, and the inner peripheral surface of the discharge check valve is opened to the pump chamber of the discharge flow path. The closed state that abuts on the end to prevent the flow of liquid from the discharge flow path to the pump chamber, and the diameter is expanded from the closed state to allow the flow of liquid from the pump chamber to the discharge flow path. The hydraulic pump according to claim 1, wherein the hydraulic pump has an open state.

前記帯板は、周方向両端に第１端部および第２端部を有し、第１端部と第２端部との間には間隙を有することを特徴とする請求項２または請求項３に記載の液圧ポンプ。 2. 3. The hydraulic pump according to 3.

前記帯板は、軸方向中間部に連通穴を有することを特徴とする請求項２から４のいずれか一つに記載の液圧ポンプ。 The hydraulic pump according to any one of claims 2 to 4, wherein the strip has a communication hole in the intermediate portion in the axial direction.

前記液圧ポンプは、前記駆動部を通電により発生する吸引力で可動鉄心を摺動するソレノイド部とした電磁ポンプとすることを特徴とする請求項１から５のいずれか一つに記載の液圧ポンプ。 The liquid according to any one of claims 1 to 5, wherein the hydraulic pump is an electromagnetic pump in which the drive portion is an electromagnetic pump having a solenoid portion that slides a movable iron core by an attractive force generated by energization. Pressure pump.