JP5662241B2 - Swash plate type variable displacement piston pump - Google Patents
Swash plate type variable displacement piston pump Download PDFInfo
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- JP5662241B2 JP5662241B2 JP2011109548A JP2011109548A JP5662241B2 JP 5662241 B2 JP5662241 B2 JP 5662241B2 JP 2011109548 A JP2011109548 A JP 2011109548A JP 2011109548 A JP2011109548 A JP 2011109548A JP 5662241 B2 JP5662241 B2 JP 5662241B2
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Description
本発明は、半円形に膨らんだ凸曲面を有する斜板と、その凸曲面が摺動可能に配置される凹曲面を有するクレイドル部材とを備え、クレイドル部材には耐摩耗性かつ低摩擦性の部材であって凹曲面を覆う斜板受け部材が装着された斜板式可変容量型ピストンポンプに関する。 The present invention includes a swash plate having a convex curved surface that swells in a semicircular shape, and a cradle member having a concave curved surface on which the convex curved surface is slidably disposed. The cradle member has wear resistance and low friction properties. The present invention relates to a swash plate type variable displacement piston pump having a swash plate receiving member that covers a concave curved surface.
斜板式可変容量型ピストンポンプは、ケーシングと、このケーシングに対し回転可能に設けられたドライブシャフトと、ケーシング内でドライブシャフトと一体的に回転可能に結合して設けられ、そのドライブシャフトの周方向に並んだ複数のシリンダボアを有するシリンダブロックと、複数のシリンダボアのそれぞれに摺動可能に挿入されたピストンと、これら複数のピストンの頭部に設けられたシューと、ドライブシャフトに貫通された状態でシューと常時接して位置し、シリンダブロックの回転運動をシリンダボアに対するピストンの往復運動に変換する斜板と、ドライブシャフトの軸心に対する斜板の傾角を可変に保持してピストンの押し退け容積を調整可能にする可変容量機構部とを備える。 The swash plate type variable displacement piston pump is provided with a casing, a drive shaft provided rotatably with respect to the casing, and a drive shaft coupled integrally with the drive shaft within the casing. A cylinder block having a plurality of cylinder bores aligned with each other, a piston slidably inserted into each of the plurality of cylinder bores, a shoe provided on the head of each of the plurality of pistons, and a state of being penetrated by the drive shaft The swash plate that is always in contact with the shoe and converts the rotary motion of the cylinder block into the reciprocating motion of the piston with respect to the cylinder bore, and the tilt angle of the swash plate with respect to the axis of the drive shaft can be variably adjusted to adjust the displacement of the piston And a variable capacity mechanism.
可変容量機構部としてはクレイドル式が採用されたものがある。この可変容量機構部は、斜板におけるシューとの摺接面に対する反対側の面に形成されドライブシャフトの軸方向に半円形に膨らんだ凸曲面と、ドライブシャフトにおける軸方向に半円形に湾曲した凹曲面を形成し、この凹曲面により凸曲面を摺動可能に受け止める低摩擦性の斜板受け部材と、この斜板受部材が装着される凹部を有し、ドライブシャフトに貫通されて位置するクレイドル部材と、斜板受け部材と斜板の凸曲面との間に潤滑油の油膜を形成する油膜形成手段とを備える。その油膜形成手段としては特許文献１，２に開示されているものがある。 Some variable capacity mechanisms employ a cradle type. The variable capacity mechanism is formed on the surface of the swash plate opposite to the sliding contact surface with the shoe and bulges in a semicircular shape in the axial direction of the drive shaft, and is curved in a semicircular shape in the axial direction of the drive shaft. A swash plate receiving member that has a concave curved surface and slidably receives the convex curved surface by the concave curved surface, and a concave portion to which the swash plate receiving member is mounted, and is located through the drive shaft. The cradle member includes oil film forming means for forming an oil film of lubricating oil between the swash plate receiving member and the convex curved surface of the swash plate. The oil film forming means is disclosed in Patent Documents 1 and 2.
特許文献１に開示されている油膜形成手段は、斜板受け部材としてのスラストブッシュに設けられた複数の小孔である。これらの小孔にはケーシング内に充填された潤滑油が入り込んで溜まる。そして、スラストブッシュに対する斜板の凸曲面の摺動に伴い潤滑油が小孔からスラストブッシュ上に広がり、この結果、油膜が形成される。しかし、小孔には潤滑油が長期間滞留しやすいので、小孔に潤滑油が長期間滞留して劣化し、その後も劣化した潤滑油が小孔に滞留し続けるという問題がある。 The oil film forming means disclosed in Patent Document 1 is a plurality of small holes provided in a thrust bush as a swash plate receiving member. Lubricating oil filled in the casing enters and accumulates in these small holes. Then, as the convex curved surface of the swash plate slides with respect to the thrust bush, the lubricating oil spreads from the small hole onto the thrust bush, and as a result, an oil film is formed. However, since the lubricating oil tends to stay in the small holes for a long time, there is a problem that the lubricating oil stays in the small holes for a long time and deteriorates, and the deteriorated lubricating oil continues to stay in the small holes thereafter.
特許文献２に開示されている油膜形成手段は、斜板受け部材としてのクレイドル受の斜板側の面に設けられた複数の油溝である。これらの油溝にはケーシング内に充填された潤滑油が入り込んで溜まる。そして、クレイドル受に対する斜板の凸曲面の摺動に伴い潤滑油が油溝からクレイドル受上に広がり、この結果、油膜が形成される。また、油溝の両端はクレイドル受の縁に位置するので、潤滑油は油溝の端を通じて油溝の内外を流通する。これによって潤滑油が油溝内に長期間滞留しない。つまり、特許文献２に開示されている油膜形成手段においては、特許文献１に開示されている油膜形成手段の場合のような問題、すなわち油溝に潤滑油が長期間滞留して劣化し、その後も劣化した潤滑油が滞留し続けるという問題は生じない。 The oil film forming means disclosed in Patent Document 2 is a plurality of oil grooves provided on a swash plate side surface of a cradle receiver as a swash plate receiving member. The lubricating oil filled in the casing enters and accumulates in these oil grooves. Then, as the convex curved surface of the swash plate slides with respect to the cradle receiver, the lubricating oil spreads from the oil groove onto the cradle receiver, and as a result, an oil film is formed. Further, since both ends of the oil groove are located at the edge of the cradle receiver, the lubricating oil flows inside and outside the oil groove through the end of the oil groove. As a result, the lubricating oil does not stay in the oil groove for a long time. That is, in the oil film forming means disclosed in Patent Document 2, the problem as in the case of the oil film forming means disclosed in Patent Document 1, that is, the lubricating oil stays in the oil groove for a long time and deteriorates. However, there is no problem that the deteriorated lubricating oil continues to stay.
前述のように、特許文献２に開示されている油膜形成手段は、クレイドル受（斜板受け部材）に設けられた複数の油溝である。これら複数の油溝が設けられたクレイドル受において、斜板の凸曲面からクレイドル受の凹曲面に与えられる接触面圧は、その凹曲面から油溝を除いた面に対して凸曲面から与えられる圧力である。その接触面圧が低いほど、斜板受け部材の凹曲面に対する斜板の凸曲面の摺動の潤滑性を向上することができるが、その接触面圧を低くするには、斜板の凸曲面の面積と、斜板受け部材の凹曲面の面積と、斜板受け部材が装着される凹部における内側の受圧面積とを広げる必要がある。このことは斜板式可変容量型ピストンポンプを大型化させることになるため、最近の斜板式可変容量型ピストンポンプに対する小型化の要望にそぐわず、好ましくない。 As described above, the oil film forming means disclosed in Patent Document 2 is a plurality of oil grooves provided in the cradle receiver (swash plate receiving member). In the cradle receiver provided with the plurality of oil grooves, the contact surface pressure applied from the convex curved surface of the swash plate to the concave curved surface of the cradle receiver is applied from the convex curved surface to the surface excluding the oil grooves from the concave curved surface. Pressure. The lower the contact surface pressure, the better the lubricity of sliding of the convex surface of the swash plate with respect to the concave surface of the swash plate receiving member. To reduce the contact surface pressure, the convex surface of the swash plate , The area of the concave curved surface of the swash plate receiving member, and the pressure receiving area on the inner side of the recess where the swash plate receiving member is mounted must be increased. This increases the size of the swash plate type variable displacement piston pump, and is not suitable for the recent demand for downsizing the swash plate type variable displacement piston pump.
本発明は前述の事情を考慮してなされたものであり、その目的は、斜板受け部材の凹曲面に対する斜板の凸曲面の摺動の潤滑性を向上させること、および、劣化した潤滑油の斜板受け部材上での滞留を防止することの両立を、大型化を抑えつつ実現できる斜板式可変容量型ピストンポンプを提供することにある。 The present invention has been made in consideration of the above-mentioned circumstances, and its object is to improve the lubricity of sliding of the convex curved surface of the swash plate with respect to the concave curved surface of the swash plate receiving member, and to deteriorate the lubricating oil An object of the present invention is to provide a swash plate type variable displacement piston pump capable of realizing coexistence of preventing stagnation on the swash plate receiving member while suppressing an increase in size.
前述の目的を達成するために本発明に係る斜板式可変容量型ピストンポンプは次のように構成されている。 In order to achieve the above object, the swash plate type variable displacement piston pump according to the present invention is configured as follows.
〔１〕 本発明に係る斜板式可変容量型ピストンポンプは、ケーシングと、このケーシングに対し回転可能に設けられたドライブシャフトと、前記ケーシング内でドライブシャフトと一体的に回転可能に結合して設けられ、そのドライブシャフトの周方向に並んだ複数のシリンダボアを有するシリンダブロックと、前記複数のシリンダボアのそれぞれに摺動可能に挿入されたピストンと、これら複数のピストンの頭部に設けられたシューと、前記ドライブシャフトに貫通された状態で前記シューと常時接して位置し、前記シリンダブロックの回転運動を前記シリンダボアに対する前記ピストンの往復運動に変換する斜板と、前記ドライブシャフトの軸心に対する斜板の傾角を可変に保持して前記ピストンの押し退け容積を調整可能にする可変容量機構部とを備え、前記可変容量機構部は、前記斜板における前記シューとの摺接面に対する反対側の面に形成され前記ドライブシャフトの軸方向に半円形に膨らんだ凸曲面と、前記ドライブシャフトにおける軸方向に半円形に湾曲した凹曲面を形成し、この凹曲面により前記凸曲面を摺動可能に受け止める低摩擦性の斜板受け部材と、この斜板受部材が装着される凹部を有し、前記ドライブシャフトに貫通されて位置するクレイドル部材と、前記ケーシング内に充填された潤滑油を利用して前記斜板受け部材と前記斜板の前記凸曲面との間に油膜を形成する油膜形成手段とを備える斜板式可変容量型ピストンポンプにおいて、前記油膜形成手段は、前記凹曲面上で開口し前記斜板受け部材を貫通して設けられた孔と、前記クレイドル部材に形成されてこのクレイドル部材の外部から前記潤滑油を導入し、前記斜板受け部材における前記斜板との摺接面側とは反対側から前記孔に前記潤滑油を導く油路とを備え、前記油路は前記凹部に形成された溝から成り、前記斜板受け部材は、前記凹部側に突出して設けられ前記溝に嵌め込まれることによって前記凹部に対する前記斜板受け部材の移動を規制する円筒部を有し、前記斜板受け部材の前記孔は、前記円筒部の内周面に囲まれて成る孔であることを特徴とする。 [1] A swash plate type variable displacement piston pump according to the present invention is provided with a casing, a drive shaft provided rotatably with respect to the casing, and integrally coupled with the drive shaft within the casing. A cylinder block having a plurality of cylinder bores arranged in the circumferential direction of the drive shaft, a piston slidably inserted in each of the plurality of cylinder bores, and a shoe provided on the heads of the plurality of pistons A swash plate that is always in contact with the shoe while being penetrated by the drive shaft, and that converts a rotational movement of the cylinder block into a reciprocating motion of the piston with respect to the cylinder bore; and a swash plate with respect to the axis of the drive shaft Variable capacity that makes it possible to adjust the displacement of the piston by holding the tilt angle of the piston variable A convex mechanism that is formed on the surface of the swash plate opposite to the sliding contact surface with the shoe and swells in a semicircular shape in the axial direction of the drive shaft; The drive shaft has a concave curved surface that is curved in a semicircular shape in the axial direction, and the concave curved surface slidably receives the convex curved surface by the concave curved surface, and a concave portion in which the swash plate receiving member is mounted. And an oil film is formed between the swash plate receiving member and the convex curved surface of the swash plate by using lubricating oil filled in the casing. In the swash plate type variable displacement piston pump comprising the oil film forming means, the oil film forming means opens on the concave curved surface and is provided through the swash plate receiving member and the cradle member. Made is by introducing the lubricating oil from the outside of the cradle member, and an oil passage for guiding the lubricant from a side opposite to the hole and the sliding contact surface of the swash plate in the swash plate receiving member, The oil passage is composed of a groove formed in the recess, and the swash plate receiving member protrudes toward the recess and is fitted into the groove to restrict movement of the swash plate receiving member with respect to the recess. And the hole of the swash plate receiving member is a hole surrounded by an inner peripheral surface of the cylindrical portion .
〔２〕 本発明に係る斜板式可変容量型ピストンポンプは、ケーシングと、このケーシングに対し回転可能に設けられたドライブシャフトと、前記ケーシング内でドライブシャフトと一体的に回転可能に結合して設けられ、そのドライブシャフトの周方向に並んだ複数のシリンダボアを有するシリンダブロックと、前記複数のシリンダボアのそれぞれに摺動可能に挿入されたピストンと、これら複数のピストンの頭部に設けられたシューと、前記ドライブシャフトに貫通された状態で前記シューと常時接して位置し、前記シリンダブロックの回転運動を前記シリンダボアに対する前記ピストンの往復運動に変換する斜板と、前記ドライブシャフトの軸心に対する斜板の傾角を可変に保持して前記ピストンの押し退け容積を調整可能にする可変容量機構部とを備え、前記可変容量機構部は、前記斜板における前記シューとの摺接面に対する反対側の面に形成され前記ドライブシャフトの軸方向に半円形に膨らんだ凸曲面と、前記ドライブシャフトにおける軸方向に半円形に湾曲した凹曲面を形成し、この凹曲面により前記凸曲面を摺動可能に受け止める低摩擦性の斜板受け部材と、この斜板受部材が装着される凹部を有し、前記ドライブシャフトに貫通されて位置するクレイドル部材と、前記ケーシング内に充填された潤滑油を利用して前記斜板受け部材と前記斜板の前記凸曲面との間に油膜を形成する油膜形成手段とを備える斜板式可変容量型ピストンポンプにおいて、前記油膜形成手段は、前記凹曲面上で開口し前記斜板受け部材を貫通して設けられた孔と、前記クレイドル部材に形成されてこのクレイドル部材の外部から前記潤滑油を導入し、前記斜板受け部材における前記斜板との摺接面側とは反対側から前記孔に前記潤滑油を導く油路とを備え、前記油路は、前記ドライブシャフトの軸方向に交差する方向に前記クレイドル部材を貫通する管路と、前記クレイドル部材に設けられ前記管路から延びて前記凹部の底部において前記斜板受け部材の前記孔に向かって開口する連絡通路とを備え、前記斜板受け部材は、前記凹部側に突出して設けられ前記連絡通路に嵌め込まれることによって前記凹部に対する前記斜板受け部材の移動を規制する円筒部を有し、前記斜板受け部材の前記孔は、前記円筒部の内周面に囲まれて成る孔であることを特徴とする。[2] A swash plate type variable displacement piston pump according to the present invention is provided with a casing, a drive shaft provided rotatably with respect to the casing, and integrally coupled with the drive shaft within the casing. A cylinder block having a plurality of cylinder bores arranged in the circumferential direction of the drive shaft, a piston slidably inserted in each of the plurality of cylinder bores, and a shoe provided on the heads of the plurality of pistons A swash plate that is always in contact with the shoe while being penetrated by the drive shaft, and that converts a rotational movement of the cylinder block into a reciprocating motion of the piston with respect to the cylinder bore; and a swash plate with respect to the axis of the drive shaft Variable so that the displacement of the piston can be adjusted by holding the tilt angle of the piston variable A convex mechanism that is formed on the surface of the swash plate opposite to the sliding contact surface with the shoe and swells in a semicircular shape in the axial direction of the drive shaft; The drive shaft has a concave curved surface that is curved in a semicircular shape in the axial direction, and the concave curved surface slidably receives the convex curved surface by the concave curved surface, and a concave portion in which the swash plate receiving member is mounted. And an oil film is formed between the swash plate receiving member and the convex curved surface of the swash plate by using lubricating oil filled in the casing. In the swash plate type variable displacement piston pump comprising the oil film forming means, the oil film forming means opens on the concave curved surface and is provided through the swash plate receiving member and the cradle member. An oil path that is formed and introduces the lubricating oil from the outside of the cradle member and guides the lubricating oil to the hole from the side opposite to the sliding contact surface side of the swash plate receiving member, The oil passage includes a conduit that passes through the cradle member in a direction intersecting the axial direction of the drive shaft, and the swash plate receiving member that is provided in the cradle member and extends from the conduit and at the bottom of the recess. A cylindrical portion that regulates movement of the swash plate receiving member with respect to the concave portion by being fitted into the communication passage. The hole of the swash plate receiving member is a hole surrounded by an inner peripheral surface of the cylindrical portion.
「〔１〕」，「〔２〕」に記載の斜板式可変容量型ピストンポンプの摩擦低減手段において、油膜形成手段の油路は、ケーシング内に充填された潤滑油を導入し、斜板受け部材の斜板側とは反対側から孔に潤滑油を導く。これにより孔内に潤滑油が充填される。そして、斜板の凸曲面が斜板受け部材の凹曲面に対して摺動することに伴い、潤滑油が孔から出て斜板受け部材の凹曲面上に広がって油膜を形成する。この油膜によって斜板を斜板受け部材の凹曲面に沿って潤滑に揺動させることができる。このようにして「〔１〕」，「〔２〕」に記載の斜板式可変容量型ピストンポンプは、斜板受け部材の凹曲面と斜板の凸曲面との間の潤滑性を向上させることができる。 In the friction reducing means of the swash plate type variable displacement piston pump described in “ [1]” , “[2]” , the oil passage of the oil film forming means introduces lubricating oil filled in the casing, Lubricating oil is introduced into the hole from the side opposite to the swash plate side of the member. This fills the hole with lubricating oil. As the convex curved surface of the swash plate slides with respect to the concave curved surface of the swash plate receiving member, the lubricating oil comes out of the hole and spreads on the concave curved surface of the swash plate receiving member to form an oil film. With this oil film, the swash plate can be lubricated and swung along the concave curved surface of the swash plate receiving member. Thus, the swash plate type variable displacement piston pump described in “[1]” and “[2]” improves the lubricity between the concave curved surface of the swash plate receiving member and the convex curved surface of the swash plate. Can do.
また、「〔１〕」，「〔２〕」に記載の斜板式可変容量型ピストンポンプにおいては、斜板受け部材の孔に充填された潤滑油が孔から出て斜板受け部材の凹曲面上に広がる際、孔には油路から新たに潤滑油が流入する。これによって、孔に潤滑油が長期間滞留して劣化し、その後も劣化した潤滑油が孔に滞留し続ける、という事態の発生を防止できる。つまり、劣化した潤滑油の斜板受け部材上での滞留を防止できる。 Further, in the swash plate type variable displacement piston pump described in “[1]” and “[2]” , the lubricating oil filled in the hole of the swash plate receiving member comes out of the hole and the concave curved surface of the swash plate receiving member. As it spreads upward, new lubricating oil flows into the hole from the oil passage. As a result, it is possible to prevent a situation in which the lubricating oil stays in the hole for a long time and deteriorates, and the deteriorated lubricating oil continues to stay in the hole after that. That is, retention of deteriorated lubricating oil on the swash plate receiving member can be prevented.
また、「〔１〕」，「〔２〕」に記載の斜板式可変容量型ピストンポンプにおいては、ケーシング内に充填された潤滑油を、クレイドル部材の油路を通じて斜板受け部材の孔に導くようになっている。つまり、斜板受け部材が孔によって潤滑油を留める機能を持ち、クレイドル部材が油路によって斜板受け部材の孔内の潤滑油を流通させる機能を持つ。これによって、特許文献２に開示されている油膜形成手段のように、斜板受け部材に潤滑油を留める機能とその潤滑油を流通させる機能との両方を持たせる油溝を採用する場合よりも、斜板式可変容量型ピストンポンプの大型化を抑えることができる。 In the swash plate type variable displacement piston pump described in “[1]” and “[2]” , the lubricating oil filled in the casing is guided to the hole of the swash plate receiving member through the oil passage of the cradle member. It is like that. That is, the swash plate receiving member has a function of retaining the lubricating oil by the hole, and the cradle member has a function of circulating the lubricating oil in the hole of the swash plate receiving member by the oil passage. As a result, as in the oil film forming means disclosed in Patent Document 2, it is more than the case of employing an oil groove that has both a function of retaining the lubricating oil on the swash plate receiving member and a function of circulating the lubricating oil. The enlargement of the swash plate type variable displacement piston pump can be suppressed.
これらのことから「〔１〕」，「〔２〕」に記載の斜板式可変容量型ピストンポンプによれば、斜板受け部材の凹曲面に対する斜板の凸曲面の摺動の潤滑性を向上させること、および、劣化した潤滑油の斜板受け部材上での滞留を防止することの両立を、大型化を抑えつつ実現できる。 Therefore, according to the swash plate type variable displacement piston pump described in “[1]” and “[2]” , the lubricity of sliding of the convex curved surface of the swash plate with respect to the concave curved surface of the swash plate receiving member is improved. It is possible to achieve both of making the oil and retaining the deteriorated lubricating oil on the swash plate receiving member while suppressing an increase in size.
また、「〔１〕」，「〔２〕」に記載の斜板式可変容量型ピストンポンプにおいて、斜板受け部材の円筒部はバーリング加工等により斜板受け部材に設けることができるものである。つまり、斜板受け部材の孔と、クレイドル部材の凹部に対する斜板受け部材の移動を規制するための突起部とを、同じ加工工程で設けることができる。また、クレイドル部材の凹部に対する斜板受け部材の移動を規制するための部品が不要になるので、斜板式可変容量型ピストンポンプの部品点数を削減できる。In the swash plate type variable displacement piston pump described in “[1]” and “[2]”, the cylindrical portion of the swash plate receiving member can be provided on the swash plate receiving member by burring or the like. That is, the hole of the swash plate receiving member and the projection for restricting the movement of the swash plate receiving member with respect to the concave portion of the cradle member can be provided in the same processing step. Further, since there is no need for a part for restricting the movement of the swash plate receiving member with respect to the recess of the cradle member, the number of parts of the swash plate type variable displacement piston pump can be reduced.
また、「〔１〕」に記載の斜板式可変容量型ピストンポンプにおいては、クレイドル部材の凹部の溝内に、ケーシング内に充填された潤滑油が導入される。その潤滑油は溝を通じて斜板受け部材の孔に導かれ、孔内に充填される。そして、斜板の凸曲面が斜板受け部材の凹曲面に対して摺動することに伴い、潤滑油が孔から出て斜板受け部材の凹曲面上に広がって油膜を形成する。この油膜によって斜板を斜板受け部材の凹曲面に沿って潤滑に揺動させることができる。 In the swash plate type variable displacement piston pump described in “[1]” , the lubricating oil filled in the casing is introduced into the groove of the concave portion of the cradle member. The lubricating oil is guided to the hole of the swash plate receiving member through the groove and filled in the hole. As the convex curved surface of the swash plate slides with respect to the concave curved surface of the swash plate receiving member, the lubricating oil comes out of the hole and spreads on the concave curved surface of the swash plate receiving member to form an oil film. With this oil film, the swash plate can be lubricated and swung along the concave curved surface of the swash plate receiving member.
また、「〔１〕」に記載の斜板式可変容量型ピストンポンプにおいては、斜板受け部材の孔に充填された潤滑油が孔から出て斜板受け部材の凹曲面上に広がる際、孔には溝から新たに潤滑油が流入する。これによって、孔に潤滑油が長期間滞留して劣化し、その後も劣化した潤滑油が孔に滞留し続ける、という事態の発生を防止できる。つまり、劣化した潤滑油の斜板受け部材上での滞留を防止できる。 In the swash plate type variable displacement piston pump described in “[1]”, when the lubricating oil filled in the hole of the swash plate receiving member comes out of the hole and spreads on the concave curved surface of the swash plate receiving member, Lubricating oil newly flows into the groove. As a result, it is possible to prevent a situation in which the lubricating oil stays in the hole for a long time and deteriorates, and the deteriorated lubricating oil continues to stay in the hole after that. That is, retention of deteriorated lubricating oil on the swash plate receiving member can be prevented.
また、「〔１〕」に記載の斜板式可変容量型ピストンポンプにおいては、ケーシング内に充填された潤滑油を、クレイドル部材の凹部の溝を通じて斜板受け部材の孔に導くようになっている。つまり、斜板受け部材が孔によって潤滑油を留める機能を持ち、クレイドル部材が溝によって斜板受け部材の孔内の潤滑油を流通させる機能を持つ。溝を設けるためにクレイドル部材の寸法を大きくする必要はない。したがって、特許文献２に開示されている油膜形成手段のように、斜板受け部材に潤滑油を留める機能とその潤滑油を流通させる機能との両方を持たせる油溝を採用する場合よりも、斜板式可変容量型ピストンポンプの大型化を抑えることができる。 In the swash plate type variable displacement piston pump described in “[1]” , the lubricating oil filled in the casing is guided to the hole of the swash plate receiving member through the groove of the recess of the cradle member. . That is, the swash plate receiving member has a function of retaining the lubricating oil by the hole, and the cradle member has a function of circulating the lubricating oil in the hole of the swash plate receiving member by the groove. It is not necessary to increase the size of the cradle member in order to provide the groove. Therefore, as in the case of the oil film forming means disclosed in Patent Document 2, rather than employing an oil groove that has both a function of retaining the lubricating oil on the swash plate receiving member and a function of circulating the lubricating oil, The increase in size of the swash plate type variable displacement piston pump can be suppressed.
また、「〔２〕」に記載の斜板式可変容量型ピストンポンプにおいては、管路の端から管路内に、ケーシング内に充填された潤滑油が導入される。その潤滑油は管路から連絡通路を通じて斜板受け部材の孔に導かれ、孔に充填される。そして、斜板の凸曲面が斜板受け部材の凹曲面に対して摺動することに伴い、潤滑油が孔から出て斜板受け部材の凹曲面上に広がって油膜を形成する。この油膜によって斜板を斜板受け部材の凹曲面に沿って潤滑に揺動させることができる。 In the swash plate type variable displacement piston pump described in “[ 2 ]”, the lubricating oil filled in the casing is introduced from the end of the pipe into the pipe. The lubricating oil is guided from the pipe line to the hole of the swash plate receiving member through the communication path and filled in the hole. As the convex curved surface of the swash plate slides with respect to the concave curved surface of the swash plate receiving member, the lubricating oil comes out of the hole and spreads on the concave curved surface of the swash plate receiving member to form an oil film. With this oil film, the swash plate can be lubricated and swung along the concave curved surface of the swash plate receiving member.
また、「〔２〕」に記載の斜板式可変容量型ピストンポンプにおいては、斜板受け部材の孔に充填された潤滑油が孔から出て斜板受け部材の凹曲面上に広がる際、孔には管路から連絡通路を通じて新たに潤滑油が流入する。これによって、孔に潤滑油が長期間滞留して劣化し、その後も劣化した潤滑油が孔に滞留し続ける、という事態の発生を防止できる。つまり、劣化した潤滑油の斜板受け部材上での滞留を防止できる。 In the swash plate type variable displacement piston pump described in “[ 2 ]”, when the lubricating oil filled in the hole of the swash plate receiving member exits from the hole and spreads on the concave curved surface of the swash plate receiving member, Lubricating oil newly flows into the pipe through the connecting passage. As a result, it is possible to prevent a situation in which the lubricating oil stays in the hole for a long time and deteriorates, and the deteriorated lubricating oil continues to stay in the hole after that. That is, retention of deteriorated lubricating oil on the swash plate receiving member can be prevented.
また、「〔２〕」に記載の斜板式可変容量型ピストンポンプにおいては、ケーシング内に充填された潤滑油を、クレイドル部材の管路および連絡通路を通じて斜板受け部材の孔に導くようになっている。つまり、斜板受け部材が孔によって潤滑油を留める機能を持ち、クレイドル部材が管路および連絡通路によって斜板受け部材の孔内の潤滑油を流通させる機能を持つ。管路および連絡通路を設けるためにクレイドル部材の寸法を大きくする必要はない。したがって、特許文献２に開示されている油膜形成手段のように、斜板受け部材に潤滑油を留める機能とその潤滑油を流通させる機能との両方を持たせる油溝を採用する場合よりも、斜板式可変容量型ピストンポンプの大型化を抑えることができる。 Further, in the swash plate type variable displacement piston pump described in “[ 2 ]”, the lubricating oil filled in the casing is guided to the hole of the swash plate receiving member through the pipe line and the communication passage of the cradle member. ing. That is, the swash plate receiving member has a function of retaining the lubricating oil by the hole, and the cradle member has a function of circulating the lubricating oil in the hole of the swash plate receiving member by the pipe line and the communication passage. It is not necessary to increase the size of the cradle member in order to provide the conduit and the communication passage. Therefore, as in the case of the oil film forming means disclosed in Patent Document 2, rather than employing an oil groove that has both a function of retaining the lubricating oil on the swash plate receiving member and a function of circulating the lubricating oil, The increase in size of the swash plate type variable displacement piston pump can be suppressed.
本発明に係る斜板式可変容量型ピストンポンプによれば、前述のように、斜板受け部材の凹曲面に対する斜板の凸曲面の摺動の潤滑性を向上させること、および、劣化した潤滑油の斜板受け部材上での滞留を防止することの両立を、大型化を抑えつつ実現できる。 According to the swash plate type variable displacement piston pump according to the present invention, as described above, the lubricity of sliding of the convex curved surface of the swash plate with respect to the concave curved surface of the swash plate receiving member is improved, and deteriorated lubricating oil The coexistence of preventing the stay on the swash plate receiving member can be realized while suppressing the increase in size.
本発明の第１参考例、第１実施形態、第２参考例、第２実施形態に係る斜板式可変容量型ピストンポンプを説明する。 A swash plate type variable displacement piston pump according to a first reference example, a first embodiment, a second reference example, and a second embodiment of the present invention will be described.
［第１参考例］
本発明の第１参考例に係る斜板式可変容量型ピストンポンプを、図１，図２を用いて説明する。
[First Reference Example ]
A swash plate type variable displacement piston pump according to a first reference example of the present invention will be described with reference to FIGS.
図１に示すように、第１参考例に係る斜板式可変容量型ピストンポンプ１は、ケーシング２と、このケーシング２に対し回転可能に設けられたドライブシャフト６と、ケーシング２内でドライブシャフト６と一体的に回転可能に結合して設けられ、そのドライブシャフト６の周方向に並んだ複数のポンプ用シリンダボア８を有するシリンダブロック７と、複数のポンプ用シリンダボア８のそれぞれに摺動可能に挿入されたピストン９と、これら複数のピストン９の頭部に設けられたシュー１０と、ドライブシャフト６に貫通された状態でシュー１０と常時接して位置し、シリンダブロック７の回転運動をポンプ用シリンダボア８に対するピストン９の往復運動に変換する斜板１１と、ドライブシャフト６の軸心に対する斜板１１の傾角を可変に保持してピストン９の押し退け容積を調整可能にする可変容量機構部２０とを備える。 As shown in FIG. 1, a swash plate type variable displacement piston pump 1 according to a first reference example includes a casing 2, a drive shaft 6 provided rotatably with respect to the casing 2, and a drive shaft 6 within the casing 2. And a cylinder block 7 having a plurality of pump cylinder bores 8 arranged in the circumferential direction of the drive shaft 6 and slidably inserted into each of the plurality of pump cylinder bores 8. The piston 9 is located in contact with the shoe 10 while being penetrated by the drive shaft 6 and the shoe 10 provided on the heads of the plurality of pistons 9. The angle of inclination of the swash plate 11 that converts the reciprocating motion of the piston 9 relative to 8 and the axis of the drive shaft 6 is variable. Holding to and a variable capacitance mechanism 20 that allows adjusting the displacement volume of the piston 9.
ケーシング２は、シリンダブロック７を収容する凹状の空間４を形成しているケーシング本体３と、その凹状の空間４に蓋をする蓋部材５とを備える。ドライブシャフト６は、凹状の空間４の底部に設けられた転がり軸受１３と、蓋部材５に設けられた転がり軸受１２とによって、ケーシング２に対して回転可能に支持されている。凹状の空間４の底部には、円弧状に吸入ポート（図示していない）と排出ポート（図示していない）が形成された弁板１６が配置され、ケーシング本体３に対して固定されている。 The casing 2 includes a casing body 3 that forms a concave space 4 that accommodates the cylinder block 7, and a lid member 5 that covers the concave space 4. The drive shaft 6 is rotatably supported with respect to the casing 2 by a rolling bearing 13 provided at the bottom of the concave space 4 and a rolling bearing 12 provided on the lid member 5. A valve plate 16 having a suction port (not shown) and a discharge port (not shown) formed in an arc shape is disposed at the bottom of the concave space 4 and is fixed to the casing body 3. .
シュー１０はピストン９の頭部に揺動可能に設けられている。複数のピストン９のそれぞれに設けられたシュー１０の全てに対し、円環状のリテーナ１４が１個装着されている。このリテーナ１４の内周面は球面状に形成されている。リテーナ１４の内周側には、球面状の外周面を有する球面ブッシュ１５が位置し、リテーナ１４の内周面が球面ブッシュ１５の外周面に摺動可能に接している。球面ブッシュ１５はその内周側でドライブシャフト６に結合し、ドライブシャフト６と一体的に回転するようになっている。これらによって、斜板１１の揺動に連動して、ピストン９の頭部でシュー１０が揺動するようになっている。 The shoe 10 is swingably provided on the head of the piston 9. One annular retainer 14 is attached to all the shoes 10 provided in each of the plurality of pistons 9. The inner peripheral surface of the retainer 14 is formed in a spherical shape. A spherical bush 15 having a spherical outer peripheral surface is located on the inner peripheral side of the retainer 14, and the inner peripheral surface of the retainer 14 is slidably in contact with the outer peripheral surface of the spherical bush 15. The spherical bush 15 is coupled to the drive shaft 6 on the inner peripheral side thereof, and rotates integrally with the drive shaft 6. As a result, the shoe 10 swings at the head of the piston 9 in conjunction with the swing of the swash plate 11.
可変容量機構部２０はクレイドル式であり、斜板１１におけるシュー１０との摺接面に対する反対側の面に形成されドライブシャフト６の軸方向に半円形に膨らんだ凸曲面２１と、ドライブシャフト６の軸方向に半円形に湾曲して凹曲面３２ａを形成し、この凹曲面３２ａで凸曲面２１を摺動可能に受け止める低摩擦性の斜板受け部材３２と、この斜板受部材３２が装着される凹部２３を有し、ドライブシャフト６に貫通されて位置するクレイドル部材２２と、ケーシング２内に充填された潤滑油を利用して斜板受け部材３２と斜板１１の凸曲面２１との間に油膜を形成する油膜形成手段（詳細は後述する）とを備える。斜板受け部材３２は、凹部２３に対して移動しないようピン（図示省略）によってクレイドル部材２２に取り付けられている。 The variable capacity mechanism 20 is a cradle type, and is formed on the surface of the swash plate 11 opposite to the sliding contact surface with the shoe 10, and has a convex curved surface 21 swelled in a semicircular shape in the axial direction of the drive shaft 6, and the drive shaft 6. A concave curved surface 32a is formed by bending in a semicircular shape in the axial direction, and a low friction swash plate receiving member 32 for slidably receiving the convex curved surface 21 by the concave curved surface 32a, and the swash plate receiving member 32 are mounted. A cradle member 22 having a recessed portion 23 that is inserted through the drive shaft 6, and a swash plate receiving member 32 and a convex curved surface 21 of the swash plate 11 using lubricating oil filled in the casing 2. Oil film forming means (details will be described later) for forming an oil film therebetween. The swash plate receiving member 32 is attached to the cradle member 22 by a pin (not shown) so as not to move with respect to the recess 23.
ケーシング２には、一対のサーボピストン２８，２９がシリンダブロック７を挟んだ位置に設けられている。一対のサーボピストン２８，２９はケーシング２に形成されたサーボ用シリンダボア３０，３１に摺動可能に挿入されている。サーボピストン２８，２９のそれぞれの頭部は斜板１１に接している。サーボ用シリンダボア３０からのサーボピストン２８の突出量と、サーボ用シリンダボア３１からのサーボピストン２９の突出量とによって、ドライブシャフト６の軸心に対する斜板１１の傾角が決定されるようになっている。 In the casing 2, a pair of servo pistons 28 and 29 are provided at positions where the cylinder block 7 is sandwiched. The pair of servo pistons 28 and 29 are slidably inserted into servo cylinder bores 30 and 31 formed in the casing 2. The heads of the servo pistons 28 and 29 are in contact with the swash plate 11. The inclination angle of the swash plate 11 with respect to the axis of the drive shaft 6 is determined by the protruding amount of the servo piston 28 from the servo cylinder bore 30 and the protruding amount of the servo piston 29 from the servo cylinder bore 31. .
油膜形成手段は、図２に示すように、凹曲面３２ａ上で開口し、その凹曲３２ａの周方向に交差する方向に斜板受け部材３２を貫通した複数の孔３４と、クレイドル部材２２に形成されてこのクレイドル部材２２の外部から潤滑油を導入し、斜板受け部材３２の凹曲面３２ａ側とは反対側から孔３４に潤滑油を導く油路としての溝３５，３６とから構成されている。 As shown in FIG. 2, the oil film forming means is formed on the cradle member 22 and a plurality of holes 34 that open on the concave curved surface 32 a and penetrate the swash plate receiving member 32 in a direction intersecting the circumferential direction of the concave curvature 32 a. It is formed of grooves 35 and 36 as oil passages that are formed and introduce lubricating oil from the outside of the cradle member 22 and guide the lubricating oil to the hole 34 from the side opposite to the concave curved surface 32a side of the swash plate receiving member 32. ing.
複数の孔３４は、凹曲面３２ａの中央部を含む範囲内で分散して位置する。これは、斜板１１から斜板受け部材３２に付与される接触面圧が凹曲面３２ａの中央部に集中するので、その中央部に重点的に油膜が形成されるようにするためである。 The plurality of holes 34 are dispersed and positioned within a range including the central portion of the concave curved surface 32a. This is because the contact surface pressure applied from the swash plate 11 to the swash plate receiving member 32 is concentrated on the central portion of the concave curved surface 32a, so that an oil film is formed on the central portion.
溝３５，３６はクレイドル部材２２の凹部２３に形成されている。溝３５は凹部２３の周方向に延びて形成されている。凹部２３の周方向の一方の縁２４には溝３５の一端が設けられ、凹部２３の他方の縁２５には溝３５の他端が設けられている。溝３６は凹部２３の軸方向に延びて形成されている。凹部２３の軸方向の一方の縁２６には溝３６の一端が設けられ、凹部２３の他方の縁２７には溝３６の他端が設けられている。溝３５，３６は複数設けられ、凹部２３上に格子状に位置する。 The grooves 35 and 36 are formed in the recess 23 of the cradle member 22. The groove 35 is formed extending in the circumferential direction of the recess 23. One end of the groove 35 is provided on one edge 24 in the circumferential direction of the recess 23, and the other end of the groove 35 is provided on the other edge 25 of the recess 23. The groove 36 is formed extending in the axial direction of the recess 23. One end 26 of the groove 36 is provided on one edge 26 in the axial direction of the recess 23, and the other end of the groove 36 is provided on the other edge 27 of the recess 23. A plurality of grooves 35 and 36 are provided, and are positioned on the concave portion 23 in a lattice shape.
このように構成された第１参考例に係る斜板式可変容量型ピストンポンプ１においては、クレイドル部材２２の凹部２３の縁２４，２５に位置する溝３５の端から溝３５内に、また、クレイドル部材２２の凹部２３の縁２６，２７に位置する溝３６の端から溝３６内に、ケーシング２内に充填された潤滑油が導入される。その潤滑油は溝３５，３６を通じて斜板受け部材３２の孔３４に導かれ、孔３４内に充填される。そして、斜板１１の凸曲面２１が斜板受け部材３２に対して摺動することに伴い、潤滑油が孔３４から出て斜板受け部材３２の凹曲面３２ａ上に広がって油膜を形成する。この油膜によって斜板１１を斜板受け部材３２の凹曲面３２ａに沿って潤滑に揺動させることができる。 In the swash plate type variable displacement piston pump 1 according to the first reference example configured as described above, from the end of the groove 35 positioned at the edges 24 and 25 of the recess 23 of the cradle member 22 into the groove 35 and also to the cradle. Lubricating oil filled in the casing 2 is introduced into the groove 36 from the end of the groove 36 located at the edges 26 and 27 of the recess 23 of the member 22. The lubricating oil is guided to the hole 34 of the swash plate receiving member 32 through the grooves 35 and 36 and filled in the hole 34. Then, as the convex curved surface 21 of the swash plate 11 slides with respect to the swash plate receiving member 32, the lubricating oil comes out of the hole 34 and spreads on the concave curved surface 32a of the swash plate receiving member 32 to form an oil film. . With this oil film, the swash plate 11 can be lubricated and swung along the concave curved surface 32 a of the swash plate receiving member 32.
また、斜板受け部材３２の孔３４に充填された潤滑油が孔３４から出て斜板受け部材３２の凹曲面３２ａ上に広がる際、孔３４には溝３５，３６から新たに潤滑油が流入する。これによって、孔３４に潤滑油が長期間滞留して劣化し、その後も劣化した潤滑油が孔３４に滞留し続ける、という事態の発生を防止できる。つまり、劣化した潤滑油の斜板受け部材３２上での滞留を防止できる。 Further, when the lubricating oil filled in the hole 34 of the swash plate receiving member 32 exits from the hole 34 and spreads on the concave curved surface 32 a of the swash plate receiving member 32, new lubricating oil is supplied to the hole 34 from the grooves 35 and 36. Inflow. As a result, it is possible to prevent a situation in which the lubricating oil stays in the hole 34 for a long time and deteriorates, and the deteriorated lubricating oil continues to stay in the hole 34 thereafter. That is, retention of deteriorated lubricating oil on the swash plate receiving member 32 can be prevented.
また、ケーシング２内に充填された潤滑油を、クレイドル部材２２の凹部２３の溝３５，３６を通じて斜板受け部材３２の孔３４に導くようになっている。つまり、斜板受け部材３２が孔３４によって潤滑油を留める機能を持ち、クレイドル部材２２が溝３５，３６によって斜板受け部材３２の孔３４内の潤滑油を流通させる機能を持つ。これによって、特許文献２に開示されている油膜形成手段のように、斜板受け部材３２に潤滑油を留める機能とその潤滑油を流通させる機能との両方を持たせる油溝を採用する場合よりも、斜板式可変容量型ピストンポンプの大型化を抑えることができる。 The lubricating oil filled in the casing 2 is guided to the hole 34 of the swash plate receiving member 32 through the grooves 35 and 36 of the recess 23 of the cradle member 22. That is, the swash plate receiving member 32 has a function of retaining the lubricating oil through the hole 34, and the cradle member 22 has a function of circulating the lubricating oil in the hole 34 of the swash plate receiving member 32 through the grooves 35 and 36. As a result, as in the case of the oil film forming means disclosed in Patent Document 2, an oil groove that has both the function of retaining the lubricating oil and the function of circulating the lubricating oil in the swash plate receiving member 32 is employed. In addition, an increase in the size of the swash plate type variable displacement piston pump can be suppressed.
第１参考例に係る斜板式可変容量型ピストンポンプ１によれば、斜板受け部材３２の凹曲面３２ａに対する斜板１１の凸曲面２１の摺動の潤滑性を向上させること、および、劣化した潤滑油の斜板受け部材３２上での滞留を防止することの両立を、大型化を抑えつつ実現できる。 According to the swash plate type variable displacement piston pump 1 according to the first reference example , the sliding lubricity of the convex curved surface 21 of the swash plate 11 with respect to the concave curved surface 32a of the swash plate receiving member 32 is improved and deteriorated. Coexistence of preventing the retention of the lubricating oil on the swash plate receiving member 32 can be realized while suppressing an increase in size.
［第１実施形態］
本発明の第１実施形態に係る斜板式可変容量型ピストンポンプを、図３，図４を用いて説明する。これら図３，図４において図１，図２に示したものと同等ものについては、図１，図２に付した符号と同じ符号を付して説明を省略する。
First Embodiment
A swash plate type variable displacement piston pump according to a first embodiment of the present invention will be described with reference to FIGS. In FIGS. 3 and 4, the same components as those shown in FIGS. 1 and 2 are designated by the same reference numerals as those shown in FIGS.
図３，図４に示すように、第１実施形態に係る斜板式可変容量型ピストンポンプにおいて、斜板受け部材３２はクレイドル部材２２の凹部２３側に突出した複数の円筒部４０を有する。これらの円筒部４０は溝３５または溝３６に嵌め込まれることによって、クレイドル部材２２の凹部２３に対する斜板受け部材３２の移動を規制するものである。斜板受け部材３２の孔３４は、円筒部４０の内周面に囲まれて成る孔である。クレイドル部材２２の凹部２３側への円筒部４０の突出寸法は、溝３５，３６の深さ寸法よりも短く設定されて、溝３５，３６から孔３４への潤滑油の流入が可能になっている。 As shown in FIGS. 3 and 4, in the swash plate type variable displacement piston pump according to the first embodiment, the swash plate receiving member 32 has a plurality of cylindrical portions 40 protruding toward the concave portion 23 of the cradle member 22. These cylindrical portions 40 are fitted in the grooves 35 or 36 to restrict the movement of the swash plate receiving member 32 with respect to the concave portion 23 of the cradle member 22. The hole 34 of the swash plate receiving member 32 is a hole surrounded by the inner peripheral surface of the cylindrical portion 40. The projecting dimension of the cylindrical portion 40 toward the concave portion 23 side of the cradle member 22 is set to be shorter than the depth dimension of the grooves 35 and 36, and the lubricating oil can flow into the hole 34 from the grooves 35 and 36. Yes.
このように構成された第１実施形態に係る斜板式可変容量型ピストンポンプにおいて、斜板受け部材３２の円筒部４０はバーリング加工等により斜板受け部材３２に設けることができるものである。つまり、斜板受け部材３２の孔３４と、溝３５，３６に嵌め込まれクレイドル部材２２の凹部２３に対する斜板受け部材３２の移動を規制する突起部とを、同じ加工工程で設けることができる。また、凹部２３に対する斜板受け部材３２の移動を規制するための部品（前述のピン）が不要になるので、斜板式可変容量型ピストンポンプの部品点数を削減できる。 In the swash plate type variable displacement piston pump according to the first embodiment configured as described above, the cylindrical portion 40 of the swash plate receiving member 32 can be provided on the swash plate receiving member 32 by burring or the like. That is, the hole 34 of the swash plate receiving member 32 and the protrusions that are fitted in the grooves 35 and 36 and restrict the movement of the swash plate receiving member 32 with respect to the recess 23 of the cradle member 22 can be provided in the same processing step. Further, since the parts (the above-mentioned pins) for restricting the movement of the swash plate receiving member 32 with respect to the recesses 23 are unnecessary, the number of parts of the swash plate type variable displacement piston pump can be reduced.
［第２参考例］
本発明の第２参考例に係る斜板式可変容量型ピストンポンプを、図５を用いて説明する。この図５において図１，図２に示したものと同等ものについては、図１，図２に付した符号と同じ符号を付して説明を省略する。
[ Second Reference Example ]
A swash plate type variable displacement piston pump according to a second reference example of the present invention will be described with reference to FIG. 5 that are the same as those shown in FIGS. 1 and 2 are given the same reference numerals as those shown in FIGS.
図５に示すように、第２参考例に係る斜板式可変容量型ピストンポンプは、クレイドル部材２２に形成されてこのクレイドル部材２２の外部から潤滑油を導入し斜板受け部材３２の凹曲面３２ａ側とは反対側から孔３４に潤滑油を導く油路として、管路５０と連絡通路５１とを備える。管路５０は、ドライブシャフト６の軸方向に交差する方向にクレイドル部材２２を貫通するものである。連絡通路５１は、クレイドル部材２２に設けられ管路５０から延びて凹部２３において斜板受け部材３２の孔３４に向かって開口するものである。 As shown in FIG. 5, the swash plate type variable displacement piston pump according to the second reference example is formed in the cradle member 22, and the lubricating oil is introduced from the outside of the cradle member 22 to form a concave curved surface 32 a of the swash plate receiving member 32. A pipe line 50 and a communication path 51 are provided as an oil path that guides the lubricating oil from the opposite side to the hole 34. The pipe 50 penetrates the cradle member 22 in a direction intersecting with the axial direction of the drive shaft 6. The communication passage 51 is provided in the cradle member 22 and extends from the conduit 50 and opens toward the hole 34 of the swash plate receiving member 32 in the recess 23.
このように構成された第２参考例に係る斜板式可変容量型ピストンポンプにおいては、管路５０の端から管路５０内に、ケーシング２内に充填された潤滑油が導入される。その滑油は管路５０から連絡通路５１を通じて斜板受け部材３２の孔３４に導かれ、孔３４に充填される。そして、斜板１１の凸曲面２１が斜板受け部材３２の凹曲面３２ａに対して摺動することに伴い、潤滑油が孔３４から出て斜板受け部材３２の凹曲面３２ａ上に広がって油膜を形成する。この油膜によって斜板１１をクレイドル部材２２の凹曲面２３に沿って潤滑に揺動させることができる。 In the swash plate type variable displacement piston pump according to the second reference example configured as described above, the lubricating oil filled in the casing 2 is introduced into the pipe line 50 from the end of the pipe line 50. The lubricating oil is guided from the pipe 50 to the hole 34 of the swash plate receiving member 32 through the communication path 51 and filled in the hole 34. As the convex curved surface 21 of the swash plate 11 slides with respect to the concave curved surface 32 a of the swash plate receiving member 32, the lubricating oil comes out of the hole 34 and spreads on the concave curved surface 32 a of the swash plate receiving member 32. An oil film is formed. With this oil film, the swash plate 11 can be lubricated and swung along the concave curved surface 23 of the cradle member 22.
また、斜板受け部材３２の孔３４に充填された潤滑油が孔３４から出て斜板受け部材３２の斜板１１側の面上に広がる際、孔３４には管路５０から連絡通路５１を通じて新たに潤滑油が流入する。これによって、孔３４に潤滑油が長期間滞留して劣化し、その後も劣化した潤滑油が孔に滞留し続ける、という事態の発生を防止できる。つまり、劣化した潤滑油の斜板受け部材３２上での滞留を防止できる。 Further, when the lubricating oil filled in the hole 34 of the swash plate receiving member 32 exits from the hole 34 and spreads on the surface on the swash plate 11 side of the swash plate receiving member 32, the communication path 51 is connected to the hole 34 from the conduit 50. New lubricating oil flows in through. Accordingly, it is possible to prevent a situation in which the lubricating oil stays in the hole 34 for a long period of time and deteriorates, and the deteriorated lubricating oil continues to stay in the hole. That is, retention of deteriorated lubricating oil on the swash plate receiving member 32 can be prevented.
また、ケーシング２内に充填された潤滑油を、クレイドル部材２２の管路５０および連絡通路５１を通じて斜板受け部材３２の孔３４に導くようになっている。つまり、斜板受け部材３２が孔３４によって潤滑油を留める機能を持ち、クレイドル部材２２が管路５０および連絡通路５１によって斜板受け部材３２の孔３４内の潤滑油を流通させる機能を持つ。これによって、特許文献２に開示されている油膜形成手段のように、斜板受け部材３２に潤滑油を留める機能とその潤滑油を流通させる機能との両方を持たせる油溝を採用する場合よりも、斜板式可変容量型ピストンポンプの大型化を抑えることができる。 Further, the lubricating oil filled in the casing 2 is guided to the hole 34 of the swash plate receiving member 32 through the conduit 50 and the communication passage 51 of the cradle member 22. That is, the swash plate receiving member 32 has a function of retaining the lubricating oil through the hole 34, and the cradle member 22 has a function of circulating the lubricating oil in the hole 34 of the swash plate receiving member 32 through the conduit 50 and the communication passage 51. As a result, as in the case of the oil film forming means disclosed in Patent Document 2, an oil groove that has both the function of retaining the lubricating oil and the function of circulating the lubricating oil in the swash plate receiving member 32 is employed. In addition, an increase in the size of the swash plate type variable displacement piston pump can be suppressed.
これらのことから、第２参考例に係る斜板式可変容量型ピストンポンプによれば、クレイドル部材２２の凹曲面２３を覆う斜板受け部材３２の凹曲面３２ａに対する斜板１１の凸曲面２１の摺動の潤滑性を向上させること、および、劣化した潤滑油の斜板受け部材３２上での滞留を防止することの両立を、大型化を抑えつつ実現できる。 From these facts, according to the swash plate type variable displacement piston pump according to the second reference example , the sliding of the convex curved surface 21 of the swash plate 11 with respect to the concave curved surface 32a of the swash plate receiving member 32 covering the concave curved surface 23 of the cradle member 22. It is possible to realize both the improvement of dynamic lubricity and the prevention of retention of deteriorated lubricating oil on the swash plate receiving member 32 while suppressing an increase in size.
[第２実施形態]
本発明の第２実施形態に係る斜板式可変容量型ピストンポンプを、図６を用いて説明する。この図６において図５に示したものと同等ものについては、図５に付した符号と同じ符号を付して説明を省略する。
[ Second Embodiment]
A swash plate type variable displacement piston pump according to a second embodiment of the present invention will be described with reference to FIG. 6 that are the same as those shown in FIG. 5 are given the same reference numerals as those shown in FIG.
図６に示すように、第２実施形態に係る斜板式可変容量型ピストンポンプは、第２参考例における３つの孔３４および連絡通路５１の替わりに、その孔３４よりも径寸法の大きな孔６０および連絡通路６２を１個を備える。また、斜板受け部材３２はクレイドル部材２２の凹部２３側に突出した円筒部６１を有する。この円筒部６１は連絡通路６２に嵌め込まれることによってクレイドル部材２２の凹部２３に対する斜板受け部材３２の移動を規制するものである。斜板受け部材３２の孔６０は、円筒部６１の内周面に囲まれて成る孔である。 As shown in FIG. 6, the swash plate type variable displacement piston pump according to the second embodiment, instead of three holes 34 and the communication passage 51 in the second reference example, large pores of diameter than the hole 34 60 And one communication passage 62. The swash plate receiving member 32 has a cylindrical portion 61 that protrudes toward the concave portion 23 of the cradle member 22. The cylindrical portion 61 is fitted into the communication passage 62 to restrict the movement of the swash plate receiving member 32 with respect to the concave portion 23 of the cradle member 22. The hole 60 of the swash plate receiving member 32 is a hole surrounded by the inner peripheral surface of the cylindrical portion 61.
第２実施形態に係る斜板式可変容量型ピストンポンプにおいて、斜板受け部材３２の円筒部６１はバーリング加工等により斜板受け部材３２に設けることができるものである。つまり、斜板受け部材３２の孔６０と、連絡通路６２に嵌め込まれクレイドル部材２２の凹部２３に対する斜板受け部材３２の移動を規制する突起部とを、同じ加工工程で設けることができる。また、クレイドル部材２２の凹部２３に対する斜板受け部材３２の移動を規制するための部品（前述のピン）が不要になるので、斜板式可変容量型ピストンポンプの部品点数を削減できる。 In the swash plate type variable displacement piston pump according to the second embodiment, the cylindrical portion 61 of the swash plate receiving member 32 can be provided on the swash plate receiving member 32 by burring or the like. That is, the hole 60 of the swash plate receiving member 32 and the protrusion that is fitted in the communication passage 62 and restricts the movement of the swash plate receiving member 32 with respect to the recess 23 of the cradle member 22 can be provided in the same processing step. Further, since the parts (the above-mentioned pins) for restricting the movement of the swash plate receiving member 32 with respect to the recess 23 of the cradle member 22 become unnecessary, the number of parts of the swash plate type variable displacement piston pump can be reduced.
１ 斜板式可変容量型ピストンポンプ
２ ケーシング
３ ケーシング本体
４ 空間
５ 蓋部材
６ ドライブシャフト
７ シリンダブロック
８ ポンプ用シリンダボア
９ ピストン
１０ シュー
１１ 斜板
１２，１３ 転がり軸受
１４ リテーナ
１５ 球面ブッシュ
２０ 可変容量機構部
２１ 凸曲面
２２ クレイドル部材
２３ 凹部
２４〜２７ 縁
２８，２９ サーボピストン
３０，３１ サーボ用シリンダボア
３２ 斜板受け部材
３２ａ 凹曲面
３４ 孔
３５，３６ 溝
４０ 円筒部
５０ 管路
５１ 連絡通路
６０ 孔
６１ 円筒部
６２ 連絡通路
DESCRIPTION OF SYMBOLS 1 Swash plate type variable displacement piston pump 2 Casing 3 Casing main body 4 Space 5 Cover member 6 Drive shaft 7 Cylinder block 8 Pump cylinder bore 9 Piston 10 Shoe 11 Swash plate 12, 13 Rolling bearing 14 Retainer 15 Spherical bush 20 Variable capacity mechanism part 21 Convex curved surface 22 Cradle member 23 Concave 24 to 27 Edges 28 and 29 Servo piston 30 and 31 Servo cylinder bore 32 Swash plate receiving member 32a Concave surface 34 Hole 35 and 36 Groove 40 Cylindrical portion 50 Pipe 51 Connecting passage 60 Hole 61 Cylinder Part 62 communication passage
Claims (2)
前記可変容量機構部は、前記斜板における前記シューとの摺接面に対する反対側の面に形成され前記ドライブシャフトの軸方向に半円形に膨らんだ凸曲面と、前記ドライブシャフトにおける軸方向に半円形に湾曲した凹曲面を形成し、この凹曲面により前記凸曲面を摺動可能に受け止める低摩擦性の斜板受け部材と、この斜板受部材が装着される凹部を有し、前記ドライブシャフトに貫通されて位置するクレイドル部材と、前記ケーシング内に充填された潤滑油を利用して前記斜板受け部材と前記斜板の前記凸曲面との間に油膜を形成する油膜形成手段とを備える斜板式可変容量型ピストンポンプにおいて、
前記油膜形成手段は、前記凹曲面上で開口し前記斜板受け部材を貫通して設けられた孔と、前記クレイドル部材に形成されてこのクレイドル部材の外部から前記潤滑油を導入し、前記斜板受け部材における前記斜板との摺接面側とは反対側から前記孔に前記潤滑油を導く油路とを備え、
前記油路は前記凹部に形成された溝から成り、
前記斜板受け部材は、前記凹部側に突出して設けられ前記溝に嵌め込まれることによって前記凹部に対する前記斜板受け部材の移動を規制する円筒部を有し、
前記斜板受け部材の前記孔は、前記円筒部の内周面に囲まれて成る孔である
ことを特徴とする斜板式可変容量型ピストンポンプ。 A casing, a drive shaft provided rotatably with respect to the casing, and a plurality of cylinder bores arranged in the casing so as to be rotatable integrally with the drive shaft and arranged in the circumferential direction of the drive shaft A cylinder block, a piston slidably inserted into each of the plurality of cylinder bores, a shoe provided on the heads of the plurality of pistons, and a constant contact with the shoe while penetrating the drive shaft Position and swash plate that converts rotational movement of the cylinder block into reciprocating motion of the piston with respect to the cylinder bore, and the tilt angle of the swash plate with respect to the axis of the drive shaft can be variably adjusted to adjust the displacement of the piston And a variable capacity mechanism to
The variable capacity mechanism is formed on the surface of the swash plate opposite to the sliding contact surface with the shoe, and has a convex curved surface that swells in a semicircular shape in the axial direction of the drive shaft, and a semicircular shape in the axial direction of the drive shaft. A drive shaft having a concavely curved curved surface, a low friction swash plate receiving member for slidably receiving the convex curved surface by the concave curved surface, and a concave portion to which the swash plate receiving member is mounted; And an oil film forming means for forming an oil film between the swash plate receiving member and the convex curved surface of the swash plate using lubricating oil filled in the casing. In the swash plate type variable displacement piston pump,
The oil film forming means opens on the concave curved surface and penetrates the swash plate receiving member, and is formed in the cradle member to introduce the lubricating oil from the outside of the cradle member. An oil passage that guides the lubricating oil to the hole from the side opposite to the slidable contact surface side with the swash plate in the plate receiving member ;
The oil passage consists of a groove formed in the recess,
The swash plate receiving member has a cylindrical portion that protrudes toward the concave portion and is fitted into the groove to restrict movement of the swash plate receiving member with respect to the concave portion,
The swash plate type variable displacement piston pump , wherein the hole of the swash plate receiving member is a hole surrounded by an inner peripheral surface of the cylindrical portion .
前記可変容量機構部は、前記斜板における前記シューとの摺接面に対する反対側の面に形成され前記ドライブシャフトの軸方向に半円形に膨らんだ凸曲面と、前記ドライブシャフトにおける軸方向に半円形に湾曲した凹曲面を形成し、この凹曲面により前記凸曲面を摺動可能に受け止める低摩擦性の斜板受け部材と、この斜板受部材が装着される凹部を有し、前記ドライブシャフトに貫通されて位置するクレイドル部材と、前記ケーシング内に充填された潤滑油を利用して前記斜板受け部材と前記斜板の前記凸曲面との間に油膜を形成する油膜形成手段とを備える斜板式可変容量型ピストンポンプにおいて、
前記油膜形成手段は、前記凹曲面上で開口し前記斜板受け部材を貫通して設けられた孔と、前記クレイドル部材に形成されてこのクレイドル部材の外部から前記潤滑油を導入し、前記斜板受け部材における前記斜板との摺接面側とは反対側から前記孔に前記潤滑油を導く油路とを備え、
前記油路は、前記ドライブシャフトの軸方向に交差する方向に前記クレイドル部材を貫通する管路と、前記クレイドル部材に設けられ前記管路から延びて前記凹部の底部において前記斜板受け部材の前記孔に向かって開口する連絡通路とを備え、
前記斜板受け部材は、前記凹部側に突出して設けられ前記連絡通路に嵌め込まれることによって前記凹部に対する前記斜板受け部材の移動を規制する円筒部を有し、
前記斜板受け部材の前記孔は、前記円筒部の内周面に囲まれて成る孔である
ことを特徴とする斜板式可変容量型ピストンポンプ。 A casing, a drive shaft provided rotatably with respect to the casing, and a plurality of cylinder bores arranged in the casing so as to be rotatable integrally with the drive shaft and arranged in the circumferential direction of the drive shaft A cylinder block, a piston slidably inserted into each of the plurality of cylinder bores, a shoe provided on the heads of the plurality of pistons, and a constant contact with the shoe while penetrating the drive shaft Position and swash plate that converts rotational movement of the cylinder block into reciprocating motion of the piston with respect to the cylinder bore, and the tilt angle of the swash plate with respect to the axis of the drive shaft can be variably adjusted to adjust the displacement of the piston And a variable capacity mechanism to
The variable capacity mechanism is formed on the surface of the swash plate opposite to the sliding contact surface with the shoe, and has a convex curved surface that swells in a semicircular shape in the axial direction of the drive shaft, and a semicircular shape in the axial direction of the drive shaft. A drive shaft having a concavely curved curved surface, a low friction swash plate receiving member for slidably receiving the convex curved surface by the concave curved surface, and a concave portion to which the swash plate receiving member is mounted; And an oil film forming means for forming an oil film between the swash plate receiving member and the convex curved surface of the swash plate using lubricating oil filled in the casing. In the swash plate type variable displacement piston pump,
The oil film forming means opens on the concave curved surface and penetrates the swash plate receiving member, and is formed in the cradle member to introduce the lubricating oil from the outside of the cradle member. An oil passage that guides the lubricating oil to the hole from the side opposite to the slidable contact surface side with the swash plate in the plate receiving member;
The oil passage includes a conduit that passes through the cradle member in a direction intersecting the axial direction of the drive shaft, and the swash plate receiving member that is provided in the cradle member and extends from the conduit and at the bottom of the recess. A communication passage opening toward the hole ,
The swash plate receiving member has a cylindrical portion that protrudes toward the recess and is fitted into the communication passage to restrict the movement of the swash plate receiving member with respect to the recess.
The swash plate type variable displacement piston pump , wherein the hole of the swash plate receiving member is a hole surrounded by an inner peripheral surface of the cylindrical portion .
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| JP7142457B2 (en) * | 2018-04-26 | 2022-09-27 | 油研工業株式会社 | Variable displacement piston pump |
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