JPH0449670U

JPH0449670U -

Info

Publication number: JPH0449670U
Application number: JP9231290U
Authority: JP
Priority date: 1990-08-31
Filing date: 1990-08-31
Publication date: 1992-04-27

Description

[Brief explanation of the drawing]

第１図は本考案の第１実施例であつて弁板の摺
接封止面側を示す側面図、第２図は放射溝の縦断
面を示す第１図のＡ−Ａ線拡大断面図、第３図及
び第４図は本考案の第２、第３実施例における放
射溝を示す部分側面図、第５図は従来のアキシヤ
ルピストンポンプの全容を示す断面図、第６図及
び第７図は同じく従来のシリンダブロツク及び弁
板の摺接封止面部分を示すものであつて、それぞ
れａは断面図、ｂは弁板の側面図である。２０……シリンダブロツク、２１……摺接封止
面、３０……弁板、３１……摺接封止面、３２…
…吸入ポート、３３……吐出ポート、３４……シ
ールランド、３５……サポートランド、３６……
導油溝、３７，３７１，３７２……放射溝、３７
ａ……屈曲部、３７１ａ，３７２ａ……凹曲部。 Fig. 1 is a side view of the first embodiment of the present invention, showing the sliding sealing surface side of the valve plate, and Fig. 2 is an enlarged sectional view taken along the line A-A in Fig. 1, showing a vertical section of the radial groove. , FIGS. 3 and 4 are partial side views showing radial grooves in the second and third embodiments of the present invention, FIG. 5 is a sectional view showing the entire structure of a conventional axial piston pump, and FIGS. FIG. 7 similarly shows the sliding sealing surface portion of a conventional cylinder block and valve plate, in which a is a sectional view and b is a side view of the valve plate. 20... Cylinder block, 21... Sliding sealing surface, 30... Valve plate, 31... Sliding sealing surface, 32...
...Suction port, 33...Discharge port, 34...Seal land, 35...Support land, 36...
Oil guide groove, 37, 371, 372...radial groove, 37
a... Bent portion, 371a, 372a... Concave bent portion.

Claims

[Scope of utility model registration request]

A cylinder block that rotates together with the drive shaft has a plurality of bores approximately parallel to the axis around the axis,
A piston that is moored to the swash plate is inserted into each bore through a shoe, and a valve plate that slides and seals the opening end surfaces of these bores has an opposing circular arc shape that matches the rotation locus of the bore opening. In an axial piston pump, a suction port and a discharge port are formed, and the ports are configured to be aligned with the suction and discharge port ends, respectively. At least one side includes an annular seal land surrounding the inner and outer peripheries of the suction and discharge ports, an annular support land formed on the outer periphery of the sliding sealing surface, and an area between the two lands. It has a plurality of radial grooves that extend through the support land and are connected to the oil guide groove occupied by the support land, and the radial groove is characterized in that a concave curved portion is formed at least on the trailing side in the relative rotational sliding direction. Axial piston pump.