JPH1054343A - Variable displacement piston pump motor - Google Patents
Variable displacement piston pump motorInfo
- Publication number
- JPH1054343A JPH1054343A JP8214858A JP21485896A JPH1054343A JP H1054343 A JPH1054343 A JP H1054343A JP 8214858 A JP8214858 A JP 8214858A JP 21485896 A JP21485896 A JP 21485896A JP H1054343 A JPH1054343 A JP H1054343A
- Authority
- JP
- Japan
- Prior art keywords
- swash plate
- piston pump
- variable displacement
- bearing
- displacement piston
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000006073 displacement reaction Methods 0.000 title claims description 23
- 238000006243 chemical reaction Methods 0.000 description 8
- 230000005489 elastic deformation Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000004043 responsiveness Effects 0.000 description 1
Landscapes
- Reciprocating Pumps (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、可変容量型ピスト
ンポンプ・モータに係り、さらに詳細には、特にその斜
板を揺動可能に支持する斜板支持部の支持構造に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable displacement piston pump / motor, and more particularly to a swash plate support structure for swingably supporting a swash plate.
【０００２】[0002]
【従来の技術】一般に、可変容量型ピストンポンプ・モ
ータは、例えば図１に示すように、斜板１０に対しシュ
ー１２ａを介して摺接している複数のピストン１２が、
駆動軸１４の回転によりこの軸周りを前記斜板１０の摺
接面１０ｂに沿って回動し、そしてそのピストン行程を
順次伸縮することにより、ポンプ・モータ作用を達成す
るように構成されている。この場合、ポンプ・モータの
容量は、前記斜板１０の駆動軸１４に対する傾斜角度を
変更することにより調節することができる。なお、図１
において、参照符号１２ｂはピストン１２のシリンダを
示し、１６ａ、１６ｂは駆動軸１４の軸受をそれぞれ示
す。2. Description of the Related Art In general, a variable displacement piston pump / motor comprises a plurality of pistons 12 slidingly contacting a swash plate 10 via shoes 12a as shown in FIG.
The rotation of the drive shaft 14 rotates around the axis along the sliding contact surface 10b of the swash plate 10, and the piston stroke of the drive shaft 14 is sequentially expanded and contracted to achieve a pump-motor operation. . In this case, the capacity of the pump / motor can be adjusted by changing the inclination angle of the swash plate 10 with respect to the drive shaft 14. FIG.
, Reference numeral 12b denotes a cylinder of the piston 12, and 16a and 16b denote bearings of the drive shaft 14, respectively.
【０００３】しかるに、前記斜板１０は、通常では、例
えば図２に示すように、中央部に設けられる駆動軸１４
の貫通穴１０ａの両側に、２つの平行凸状円筒軸受面２
０、２０を有する。そして、この斜板１０は、その摺接
面１０ｂ上に負荷されるピストン１２からの反力Ｆを、
前記凸状円筒軸受面２０、２０に対向する位置に、軸受
部材２２、２２が固定されている支持部２４上の２つの
凹状円筒支持面２６、２６で支持されるように構成され
てている。従って、このような斜板の支持構造によれ
ば、前記斜板１０が容易に所定の揺動を生じるので、前
記ポンプ・モータの容量を簡便に所望の値に調節するこ
とができる。なお、図２において、参照符号２８、２８
は位置決め部材を示す。[0003] However, the swash plate 10 is usually provided with a drive shaft 14 provided at the center as shown in FIG.
Two parallel convex cylindrical bearing surfaces 2 on both sides of the through hole 10a
It has 0 and 20. The swash plate 10 generates a reaction force F from the piston 12 loaded on the sliding surface 10b.
At positions facing the convex cylindrical bearing surfaces 20, 20, the bearing members 22, 22 are configured to be supported by two concave cylindrical support surfaces 26, 26 on a support portion 24 to which the bearing members 22 are fixed. . Therefore, according to such a swash plate support structure, the swash plate 10 easily generates a predetermined swing, so that the capacity of the pump / motor can be easily adjusted to a desired value. In FIG. 2, reference numerals 28, 28
Indicates a positioning member.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、前記従
来の可変容量型ピストンポンプ・モータは、特にその斜
板支持構造において、なお以下に述べるような難点を有
していた。However, the conventional variable displacement piston pump / motor has the following drawbacks, especially in its swash plate support structure.
【０００５】すなわち、図６は、前記図２に示す構成に
おける斜板支持構造において、特にその負荷（ピストン
反力Ｆ）が、例えば建設機械等におけるような高負荷使
用時の状態を示している。しかるに、この場合、斜板１
０はピストン１２の反力Ｆで弾性変形する。このため、
軸受部材２２、２２の凸状円筒軸受面２０、２０に対す
る接触軸受面積２２ｂ、２２ｂ′は、軸受部材２２上に
おける、凸状円筒軸受面２０の摺動方向（図１の矢印方
向）で、かつ駆動軸貫通穴１０ａに近接する側に沿って
延在する２つの狭い幅２２ａ、２２ａ′内の領域に限定
されている。That is, FIG. 6 shows a state in which the load (piston reaction force F) of the swash plate support structure having the structure shown in FIG. . However, in this case, the swash plate 1
0 is elastically deformed by the reaction force F of the piston 12. For this reason,
The contact bearing areas 22b, 22b 'of the bearing members 22, 22 with respect to the convex cylindrical bearing surfaces 20, 20 are in the sliding direction of the convex cylindrical bearing surface 20 on the bearing member 22 (the direction of the arrow in FIG. 1), and It is limited to the area within the two narrow widths 22a, 22a 'extending along the side adjacent to the drive shaft through hole 10a.
【０００６】すなわち、このような従来の斜板支持構造
においては、装置の高負荷使用時に、軸受部材の接触軸
受面積が局所的に限定され、従ってその摩耗が局部的に
促進されることから、結果的に、装置全体の信頼性が損
なわれると共に、その寿命も低下する等の難点を有して
いた。That is, in such a conventional swash plate support structure, when the apparatus is used under a high load, the contact bearing area of the bearing member is locally limited, and the wear is locally promoted. As a result, the reliability of the entire apparatus is impaired, and the life of the apparatus is shortened.
【０００７】また、前記難点を誘発する原因、すなわち
斜板の弾性変形を克服するため、前記斜板の剛性を強化
することが提案される。、しかしながら、この場合、反
面において、特に可動部の慣性が増大するために、装置
が大形化しかつその応答性も低下する等の別の難点を生
じる。It has also been proposed to increase the rigidity of the swash plate in order to overcome the cause of the difficulty, that is, the elastic deformation of the swash plate. However, in this case, on the other hand, another problem arises, in particular, that the inertia of the movable portion is increased, so that the device is enlarged and its responsiveness is reduced.
【０００８】そこで、本発明の目的は、高負荷に対して
も信頼性に優れかつ高寿命であると共に、簡単に構成す
ることができる可変容量型ピストンポンプ・モータを提
供することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a variable displacement piston pump / motor which has excellent reliability and a long service life even under a high load and can be easily constructed.
【０００９】[0009]
【課題を解決するための手段】前記目的を達成するため
に、本発明に係る可変容量型ピストンポンプ・モータ
は、駆動軸貫通穴の両側に２つの平行凸状円筒軸受面を
形成した斜板を、前記凸状円筒軸受面に対向する位置
に、軸受部材を固定した２つの凹状円筒支持面を有する
支持部を介して、揺動可能に支持してなる可変容量型ピ
ストンポンプ・モータにおいて、支持部の凹状円筒支持
面と軸受部材との間に、斜板の凸状円筒軸受面の摺動方
向にかつ駆動軸貫通穴に近接する側に沿って、延在する
所定幅の隙間を形成することを特徴とする。To achieve the above object, a variable displacement piston pump / motor according to the present invention comprises a swash plate having two parallel convex cylindrical bearing surfaces formed on both sides of a drive shaft through hole. In a variable displacement piston pump / motor, which is swingably supported at a position opposed to the convex cylindrical bearing surface via a support having two concave cylindrical support surfaces to which a bearing member is fixed, A gap having a predetermined width is formed between the concave cylindrical support surface of the support portion and the bearing member in the sliding direction of the convex cylindrical bearing surface of the swash plate and along the side close to the drive shaft through hole. It is characterized by doing.
【００１０】この場合、前記隙間は、支持部の凹状円筒
支持面と軸受部材との間に所定形状の薄肉部材を介在す
ることにより形成することができる。In this case, the gap can be formed by interposing a thin member having a predetermined shape between the concave cylindrical support surface of the support portion and the bearing member.
【００１１】また、前記隙間は、支持部の凹状円筒支持
面の一部を所定形状に切欠くことにより、あるいは軸受
部材の一部を所定形状に切欠くことにより、それぞれ形
成することができる。The gap can be formed by notching a part of the concave cylindrical support surface of the support part in a predetermined shape or notching a part of the bearing member in a predetermined shape.
【００１２】本発明に係る可変容量型ピストンポンプ・
モータにおける、斜板支持構造によれば、装置の高負荷
使用時において、仮に斜板がピストンの反力で弾性変形
しても、軸受部材の前記弾性変形領域に対応する領域、
すなわち軸受部材と凹状円筒支持面との間における、凸
状円筒軸受面の摺動方向にかつ駆動軸貫通穴に近接する
側に沿って延在する所定幅の領域には、前記弾性変形に
対して軸受部材の変形を許容する隙間が形成される。The variable displacement piston pump according to the present invention
In the motor, according to the swash plate support structure, when the device is used under high load, even if the swash plate is elastically deformed by the reaction force of the piston, an area corresponding to the elastic deformation area of the bearing member,
That is, a region of a predetermined width extending between the bearing member and the concave cylindrical support surface in the sliding direction of the convex cylindrical bearing surface and along the side close to the drive shaft through-hole is provided for the elastic deformation. As a result, a gap is formed that allows deformation of the bearing member.
【００１３】従って、本発明によれば、装置の高負荷使
用時には、軸受部材が所要の変形を生じて、その局部摩
耗を防止し得るので、装置の信頼性を向上し得ると共
に、その耐用寿命も延長することができる。Therefore, according to the present invention, when the device is used under a high load, the bearing member is required to be deformed and its local wear can be prevented, so that the reliability of the device can be improved and its service life can be improved. Can also be extended.
【００１４】[0014]
【実施例】次に、本発明に係る可変容量型ピストンポン
プ・モータの実施例につき、添付図面を参照しながら以
下詳細に説明する。なお、説明の便宜上、図１、２およ
び６に示す、一般的な構造あるいは従来の構造と同一の
構成部分には、同一の参照符号を付し、詳細な説明は省
略する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a variable displacement piston pump / motor according to the present invention will be described in detail with reference to the accompanying drawings. For convenience of explanation, the same components as those of the general structure or the conventional structure shown in FIGS. 1, 2 and 6 are denoted by the same reference numerals, and detailed description thereof will be omitted.
【００１５】先ず初めに、本発明に係る可変容量型ピス
トンポンプ・モータは、その斜板支持構造を含み、前記
従来の構造あるいは一般的な構造と基本的に同一であ
る。すなわち、重複するが再び簡単に説明すると、先ず
本発明のピストンポンプ・モータ（図１参照）は、斜板
１０に摺接する複数のピストン１２が、駆動軸１４の回
転により斜板摺接面１０ｂの周りを回動することによ
り、ポンプ・モータ作用を達成するように構成されてい
る。First, the variable displacement piston pump / motor according to the present invention includes its swash plate support structure, and is basically the same as the conventional structure or the general structure. That is, the overlapping but briefly described again. First, in the piston pump / motor of the present invention (see FIG. 1), the plurality of pistons 12 slidingly contacting the swash plate 10 are rotated by the rotation of the drive shaft 14 so that the swash plate sliding contact surface 10b Is configured to achieve a pump-motor operation by pivoting around.
【００１６】また、図２に示す、斜板支持構造は、基本
的には前記斜板１０が、その２つの平行凸状円筒軸受面
２０に対向する位置に、軸受部材２２が固定された２つ
の凹状円筒支持面２６を有する支持部２４上に、揺動可
能に支持されることにより、前記ポンプ・モータの容量
を調節し得るように構成されている。The swash plate support structure shown in FIG. 2 basically has a bearing member 22 fixed at a position where the swash plate 10 faces the two parallel convex cylindrical bearing surfaces 20. It is configured to be swingably supported on a support portion 24 having two concave cylindrical support surfaces 26 so that the capacity of the pump / motor can be adjusted.
【００１７】しかるに、本発明においては、前記構成に
おいて、図３の（ａ）〜（ｃ）に示すように、支持部２
４の凹状円筒支持面２６、２６と、軸受部材２２、２２
との間には、斜板１０の凸状円筒軸受面２０、２０の摺
動方向に、かつ駆動軸貫通穴１０ａに近接する側に沿っ
て延在する所定幅の隙間３０、３０′を形成するように
構成されている。すなわち、本実施例においては、支持
部２４の凹状円筒支持面２６、２６と、軸受部材２２、
２２との間に、それぞれ隙間幅３２ａ、３２ａ′および
隙間厚さ３２ｂ、３２ｂ′を有する、所定形状の薄肉部
材３２、３２を介在することにより、前記所定の隙間３
０、３０′が形成されている。However, according to the present invention, in the above configuration, as shown in FIGS.
4, the concave cylindrical support surfaces 26, 26 and the bearing members 22, 22
And gaps 30, 30 'of a predetermined width extending in the sliding direction of the convex cylindrical bearing surfaces 20, 20 of the swash plate 10 and along the side close to the drive shaft through-hole 10a. It is configured to be. That is, in the present embodiment, the concave cylindrical support surfaces 26, 26 of the support portion 24 and the bearing member 22,
22 having a gap width 32a, 32a 'and a gap thickness 32b, 32b', respectively, having a predetermined shape.
0, 30 'are formed.
【００１８】なお、図３の（ａ）は、ピストンの反力Ｆ
がゼロまたは極小さい場合の状態を示し、また図３の
（ｂ）および（ｃ）は、ピストンの反力Ｆが比較的大き
い場合の状態を示している。FIG. 3A shows the reaction force F of the piston.
Is zero or extremely small, and FIGS. 3B and 3C show the state when the reaction force F of the piston is relatively large.
【００１９】従って、このような構成からなる本実施例
においては、装置の高負荷使用時に、仮に斜板１０がピ
ストンの反力Ｆで弾性変形しても〔図３の（ｂ）、
（ｃ）参照〕、軸受部材２２、２２は、その前記対応隙
間３０、３０′を介して、前記斜板１０の弾性変形に対
応するように、同様に弾性変形させることができる。す
なわち、軸受部材２２、２２は、その凸状円筒軸受面２
０、２０との間の接触軸受幅２２ａ、２２ａ′あるいは
接触軸受面積２２ｂ、２２ｂ′を、図６に示す従来の場
合と比較して、大幅に増大させることができる。Therefore, in the present embodiment having such a configuration, even when the swash plate 10 is elastically deformed by the reaction force F of the piston when the device is used under a high load [FIG.
(See (c))], the bearing members 22, 22 can be similarly elastically deformed through the corresponding gaps 30, 30 'so as to correspond to the elastic deformation of the swash plate 10. That is, the bearing members 22 and 22 have the convex cylindrical bearing surface 2
Contact bearing widths 22a, 22a 'or contact bearing areas 22b, 22b' between 0 and 20 can be greatly increased as compared with the conventional case shown in FIG.
【００２０】従って、本実施例によれば、軸受部材を、
高負荷使用時にもその軸受面圧を可及的に低下させて、
その局部摩耗を防止し得るので、装置の信頼性を向上す
ることができると共に、耐用寿命も延長することができ
る。また、前記実施例によれば、装置全体も、極めて簡
単に構成することができる等の利点も有している。Therefore, according to this embodiment, the bearing member is
Even when using a high load, the bearing surface pressure is reduced as much as possible,
Since the local wear can be prevented, the reliability of the device can be improved and the service life can be extended. Further, according to the above-described embodiment, the whole apparatus also has an advantage that it can be configured very simply.
【００２１】図４および図５は、本発明に係る可変容量
型ピストンポンプ・モータにおける斜板支持構造の、別
の実施例を示すものである。すなわち、本実施例は、軸
受部材２２、２２と凹状円筒支持面２６、２６との間
に、隙間を形成する別の手段を示すものである。FIGS. 4 and 5 show another embodiment of the swash plate support structure in the variable displacement piston pump / motor according to the present invention. That is, the present embodiment shows another means for forming a gap between the bearing members 22, 22 and the concave cylindrical support surfaces 26, 26.
【００２２】図４において、隙間３４、３４′（あるい
は３４″）は、凹状円筒支持面２６の一部を、所定形状
（矩形または楔形）に切欠くことにより形成するもので
ある。また、図５において、隙間３６、３６′（あるい
は３６″）は、軸受部材２２の一部を、所定形状（矩形
または楔形）に切欠くことにより形成するものである。
なお、これらの実施例においても、図３に示す先の実施
例と同様の作用および効果を発揮させることができるこ
とは明らかである。従って、詳細な説明は省略する。4, the gaps 34, 34 '(or 34 ") are formed by cutting a part of the concave cylindrical support surface 26 into a predetermined shape (rectangular or wedge-shaped). In 5, the gaps 36, 36 '(or 36 ") are formed by cutting out a part of the bearing member 22 into a predetermined shape (rectangular or wedge-shaped).
It is clear that these embodiments can also exert the same functions and effects as those of the previous embodiment shown in FIG. Therefore, detailed description is omitted.
【００２３】なお、本発明においては、軸受部材の凸状
円筒軸受面に対する前記接触軸受面積内に、その摩擦抵
抗を低減すべく、ピストンポンプ・モータの高圧油を導
入する構造と併用してもよい。In the present invention, in order to reduce the frictional resistance in the area of the contact bearing with respect to the convex cylindrical bearing surface of the bearing member, the structure may be used in combination with a structure for introducing high-pressure oil of a piston pump / motor. Good.
【００２４】以上、本発明の好適な実施例について説明
したが、本発明は前記実施例に限定されることなく、そ
の精神を逸脱しない範囲内において多くの設計変更が可
能である。While the preferred embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and many design changes can be made without departing from the spirit of the present invention.
【００２５】[0025]
【発明の効果】以上説明したように、本発明に係る可変
容量型ピストンポンプ・モータは、駆動軸貫通穴の両側
に２つの平行凸状円筒軸受面を形成した斜板を、前記凸
状円筒軸受面に対向する位置に、軸受部材を固定した２
つの凹状円筒支持面を有する支持部を介して、揺動可能
に支持してなる可変容量型ピストンポンプ・モータにお
いて、支持部の凹状円筒支持面と軸受部材との間に、斜
板の凸状円筒軸受面の摺動方向にかつ駆動軸貫通穴に近
接する側に沿って、延在する所定幅の隙間を形成する構
成としたことにより、斜板が装置の高負荷使用時にピス
トンの反力で弾性変形しても、この弾性変形に対応する
ように、軸受部材も同様に弾性変形して、高負荷使用時
においても軸受部材の接触軸受面積が増大して、その局
部摩耗を可及的に抑制することができる。As described above, the variable displacement piston pump / motor according to the present invention comprises a swash plate having two parallel convex cylindrical bearing surfaces formed on both sides of a drive shaft through-hole. The bearing member is fixed at a position facing the bearing surface.
In a variable displacement piston pump / motor that is swingably supported via a support having two concave cylindrical support surfaces, a convex swash plate is provided between the concave cylindrical support surface of the support and the bearing member. By forming a gap having a predetermined width extending in the sliding direction of the cylindrical bearing surface and along the side close to the drive shaft through-hole, the swash plate exerts a reaction force of the piston when the device is used under a high load. Even if the bearing is elastically deformed, the bearing member is also elastically deformed to correspond to this elastic deformation. Can be suppressed.
【００２６】従って、本発明によれば、高負荷に対して
も信頼性に優れかつ高寿命であると共に、簡単な構成か
らなる可変容量型ピストンポンプ・モータを容易に提供
することができる。Therefore, according to the present invention, it is possible to easily provide a variable displacement piston pump / motor having excellent reliability and a long service life even under a high load and having a simple structure.
【図１】一般的な可変容量型ピストンポンプ・モータの
全体的構成を示す要部断面図である。FIG. 1 is a sectional view of a main part showing an overall configuration of a general variable displacement piston pump / motor.
【図２】図１に示すピストンポンプ・モータにおける通
常の斜板支持構造を示す分解斜視図である。FIG. 2 is an exploded perspective view showing a normal swash plate support structure in the piston pump / motor shown in FIG.
【図３】本発明に係る可変容量型ピストンポンプ・モー
タにおける斜板支持構造の一実施例を示し、（ａ）はゼ
ロまたは軽負荷時の側面図であり、（ｂ）および（ｃ）
は高負荷時の側面図および平面図である。FIG. 3 shows an embodiment of a swash plate support structure in a variable displacement piston pump / motor according to the present invention, wherein (a) is a side view at zero or light load, and (b) and (c).
FIG. 4 is a side view and a plan view under a high load.
【図４】本発明に係る可変容量型ピストンポンプ・モー
タにおける斜板支持構造の別の実施例を示す側面図であ
る。FIG. 4 is a side view showing another embodiment of the swash plate support structure in the variable displacement piston pump / motor according to the present invention.
【図５】本発明に係る可変容量型ピストンポンプ・モー
タにおける斜板支持構造のさらに別の実施例を示す側面
図である。FIG. 5 is a side view showing still another embodiment of the swash plate support structure in the variable displacement piston pump / motor according to the present invention.
【図６】従来の斜板支持構造の高負荷時における状態を
示し、（ａ）は側面図であり、（ｂ）は平面図である。6A and 6B show a state of the conventional swash plate support structure under a high load, where FIG. 6A is a side view and FIG. 6B is a plan view.
１０ 斜板 １０ａ 駆動軸貫通穴 １０ｂ 斜板摺接面 １２ ピストン １２ａ シュー １２ｂ シリンダ １４ 駆動軸 １６ 軸受 ２０ 凸状円筒軸受面 ２２ 軸受部材 ２２ａ、２２ａ′ 接触軸受幅 ２２ｂ、２２ｂ′ 接触軸受面積 ２４ 支持部 ２６ 凹状円筒支持面 ３０、３０′ 隙間 ３２ 薄肉部材 ３２ａ、３２ａ′ 隙間幅 ３２ｂ、３２ｂ′ 隙間厚さ ３４、３４′、３４″ 隙間 ３６、３６′、３６″ 隙間 Reference Signs List 10 swash plate 10a drive shaft through hole 10b swash plate sliding contact surface 12 piston 12a shoe 12b cylinder 14 drive shaft 16 bearing 20 convex cylindrical bearing surface 22 bearing member 22a, 22a 'contact bearing width 22b, 22b' contact bearing area 24 support Part 26 Concave cylindrical support surface 30, 30 'Gap 32 Thin member 32a, 32a' Gap width 32b, 32b 'Gap thickness 34, 34', 34 "Gap 36, 36 ', 36" Gap
───────────────────────────────────────────────────── フロントページの続き (72)発明者 長谷川 公則 神奈川県座間市ひばりが丘４丁目5676番地 東芝機械株式会社相模事業所内 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kiminori Hasegawa 4-5676 Hibarigaoka, Zama City, Kanagawa Prefecture Toshiba Machine Co., Ltd. Sagami Plant
Claims (4)
筒軸受面を形成した斜板を、前記凸状円筒軸受面に対向
する位置に、軸受部材を固定した２つの凹状円筒支持面
を有する支持部を介して、揺動可能に支持してなる可変
容量型ピストンポンプ・モータにおいて、 支持部の凹状円筒支持面と軸受部材との間に、斜板の凸
状円筒軸受面の摺動方向にかつ駆動軸貫通穴に近接する
側に沿って、延在する所定幅の隙間を形成することを特
徴とする可変容量型ピストンポンプ・モータ。1. A swash plate having two parallel convex cylindrical bearing surfaces formed on both sides of a drive shaft through hole, and two concave cylindrical support surfaces to which bearing members are fixed at positions facing the convex cylindrical bearing surfaces. A variable displacement piston pump / motor, which is swingably supported via a support having a swash plate, includes a swash plate that slides between a concave cylindrical support surface and a bearing member. A variable displacement piston pump / motor, wherein a gap having a predetermined width is formed extending in a moving direction and along a side close to a drive shaft through hole.
部材との間に所定形状の薄肉部材を介在することにより
形成してなる請求項１記載の可変容量型ピストンポンプ
・モータ。2. The variable displacement piston pump motor according to claim 1, wherein the gap is formed by interposing a thin member having a predetermined shape between the concave cylindrical support surface of the support portion and the bearing member.
を所定形状に切欠くことにより形成してなる請求項１記
載の可変容量型ピストンポンプ・モータ。3. The variable displacement piston pump motor according to claim 1, wherein the gap is formed by cutting a part of the concave cylindrical support surface of the support portion into a predetermined shape.
欠くことにより形成してなる請求項１記載の可変容量型
ピストンポンプ・モータ。4. The variable displacement piston pump motor according to claim 1, wherein the gap is formed by cutting a part of the bearing member into a predetermined shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21485896A JP3859777B2 (en) | 1996-08-14 | 1996-08-14 | Variable displacement piston pump / motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21485896A JP3859777B2 (en) | 1996-08-14 | 1996-08-14 | Variable displacement piston pump / motor |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2006220945A Division JP4740413B2 (en) | 2006-08-14 | 2006-08-14 | Variable displacement piston pump / motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1054343A true JPH1054343A (en) | 1998-02-24 |
| JP3859777B2 JP3859777B2 (en) | 2006-12-20 |
Family
ID=16662727
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21485896A Expired - Lifetime JP3859777B2 (en) | 1996-08-14 | 1996-08-14 | Variable displacement piston pump / motor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3859777B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101757971B1 (en) * | 2015-04-28 | 2017-07-19 | 유원산업(주) | Piston shoe of hydraulic pump |
-
1996
- 1996-08-14 JP JP21485896A patent/JP3859777B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP3859777B2 (en) | 2006-12-20 |
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