CN105736362A - 可变容量泵 - Google Patents

可变容量泵 Download PDF

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Publication number
CN105736362A
CN105736362A CN201510983298.7A CN201510983298A CN105736362A CN 105736362 A CN105736362 A CN 105736362A CN 201510983298 A CN201510983298 A CN 201510983298A CN 105736362 A CN105736362 A CN 105736362A
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outer rotor
rotor
recess
guide
variable displacement
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CN105736362B (zh
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篠原徹
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Mahle Filter Systems Japan Corp
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Mahle Filter Systems Japan Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/30—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C2/34—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members
    • F04C2/344—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/18—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber
    • F04C14/22—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by changing the eccentricity between cooperating members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/18—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber
    • F04C14/22—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by changing the eccentricity between cooperating members
    • F04C14/223—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by changing the eccentricity between cooperating members using a movable cam
    • F04C14/226—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by changing the eccentricity between cooperating members using a movable cam by pivoting the cam around an eccentric axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/06—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/30—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C18/34—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members
    • F04C18/344—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
    • F04C18/352—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member the vanes being pivoted on the axis of the outer member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/30—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C2/32—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having both the movement defined in groups F04C2/02 and relative reciprocation between co-operating members
    • F04C2/332—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having both the movement defined in groups F04C2/02 and relative reciprocation between co-operating members with vanes hinged to the outer member and reciprocating with respect to the inner member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/30—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C2/34—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members
    • F04C2/344—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
    • F04C2/348—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member the vanes positively engaging, with circumferential play, an outer rotatable member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/30—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C2/34—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members
    • F04C2/344—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
    • F04C2/352—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member the vanes being pivoted on the axis of the outer member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
    • F04C28/18—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by varying the volume of the working chamber
    • F04C28/22—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by varying the volume of the working chamber by changing the eccentricity between cooperating members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/12—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2210/00—Fluid
    • F04C2210/14—Lubricant
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/50—Bearings
    • F04C2240/54—Hydrostatic or hydrodynamic bearing assemblies specially adapted for rotary positive displacement pumps or compressors

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Rotary Pumps (AREA)

Abstract

本发明提供一种可变容量泵，使外转子导向件和外转子之间的接触面积减小。可变容量泵(1)具备：具有吸入端口(11)以及喷出端口(12)的外壳(2)、可摆动地配置于外壳(2)内并且贯通形成有圆筒状的外转子支承面(3a)的圆环状的外转子导向件(3)、可旋转地嵌合于外转子支承面(3a)的圆筒状的外转子(4)、配置于外转子(4)的内周侧并且在相对于外转子(4)偏心的位置与驱动轴(15)一体旋转的内转子(5)、将外转子(4)和内转子(5)连结的连结板(6)。在外转子支承面(3a)上形成有遍及两端面(3c)之间沿轴方向连续的两个凹部(30)，凹部(30)以作为整体收纳在吸入端口(11)的区域内的方式沿周方向延伸。

Description

可变容量泵
技术领域
本发明涉及例如用于向内燃机或自动变速器供给润滑油的可变容量泵。
背景技术
作为用于内燃机或自动变速器等的油泵，例如专利文献1中公开有具有摆动式的外转子导向件的可变容量泵。在该泵中，外转子导向件在泵壳内被摆动自如地保持，并且在外转子导向件内可旋转地嵌合有圆筒状的外转子。而且，外转子伴随经由多个连结板连结的内转子的旋转，相对于外转子导向件进行旋转。
现有技术文献
专利文献
专利文献1：日本特开2010-164056号公报
发明内容
(发明要解决的技术问题)
在如上构成的泵中，外转子导向件的内周面和外转子的外周面的接触面积大，一边剪断形成于两者间的油膜一边使外转子旋转，因此，产生剪断阻力高进而驱动所需的扭矩大的问题。特别是，上述问题在油的粘度变高的低温时显著。
(解决技术问题的技术方案)
本发明涉及可变容量泵，该可变容量泵具备：外壳，其构成一对端部壁面，配置有贯通这些端部壁面的驱动轴，并且，在一对端部壁面中的至少一个上形成有吸入端口以及喷出端口；圆环状的外转子导向件，其以端面密接于端部壁面的状态可摆动地配置于端部壁面间，贯通形成有驱动轴所通过的圆筒状的外转子支承面；圆筒状的外转子，其具有由圆筒面构成的外周面，并且可旋转地嵌合于外转子支承面；内转子，其配置于外转子的内周侧，在相对于该外转子偏心的位置与驱动轴一体旋转；多个连结板，其将内转子和外转子连结，以将旋转力从内转子向外转子传递，并且将在外转子和内转子之间划分出的空间划分成多个腔室。在外转子支承面上形成有遍及外转子导向件的两端面间沿轴方向连续的凹部。
在这样的结构中，相互滑动的外转子支承面和外转子外周面的接触面积减小。而且，凹部遍及外转子导向件的两端面间沿轴方向连续，因此，可以使用模具容易地成形。另外，由于外转子导向件的两端开口，所以通过机械加工也可以容易地加工凹部。
在本发明的优选的一方式中，将凹部配设于吸入端口的区域内。
通过设为这样的结构，不伴随过度的面压上升而可以减小外转子支承面和外转子外周面之间的接触面积。即，在泵工作中外转子被压向喷出端口侧，其结果，喷出端口侧的外转子支承面的面压升高，另一方面，吸入端口侧的外转子支承面的面压降低，因此，优选的是在与吸入端口的区域相对应的外转子支承面上设置凹部。
而且，在本发明的优选的一方式中，在吸入端口和喷出端口之间的区域未设置凹部。
假如在上述区域设置有凹部的情况下，高压的油容易经由凹部向低压侧漏出。
(发明的效果)
根据本发明，由于外转子导向件的外转子支承面和外转子的外周面之间的接触面积减小，所以可以降低两者间的剪断阻力，进而可以减小驱动所需的扭矩。
附图说明
图1是本发明的可变容量泵的正面图。
图2是本发明的可变容量泵的立体图。
图3是本发明的可变容量泵的主要部分的正面图。
图4是本发明的可变容量泵的透视图。
图5是外壳以及外转子导向件的正面图。
图6是外壳以及外转子导向件的立体图。
图7是外转子导向件的正面图。
图8是外转子导向件的立体图。
符号说明
1可变容量泵
2外壳
3外转子导向件
3a外转子支承面
4外转子
5内转子
6连结板
11吸入端口
30凹部。
具体实施方式
以下，基于图1～图8详细说明本发明的一实施例。
图1是以拆下了端板(未图示)的状态表示本发明的可变容量泵的图，图2是其立体图。可变容量泵1具备：外壳2、配置于外壳2内的圆环状的外转子导向件3、嵌合于外转子导向件3的圆筒状的外转子4、配置于外转子4的内周侧的内转子5、连结外转子4和内转子5的多个钟摆型的连结板6。
外壳2由躯体部2A和未图示的端板构成，两者利用螺栓等被一体地紧固，其中，该躯体部2A具备通过周壁面2a以及一端的端部壁面2b划分的凹部8(参照图5)，该未图示的端板覆盖该凹部8。未图示的端板具有与凹部8侧的端部壁面2b对置的端部壁面(未图示)。在本实施例中，在躯体部2A侧的端部壁面2b上形成有与吸入口13连通的吸入端口11和与设于端板的喷出口(未图示)连通的喷出端口12。吸入端口11以及喷出端口12设于相互离开适宜的角度(例如180°)的位置，两端口11、12相互被隔开。另外，在外壳2上配置有贯通躯体部2A侧的端部壁面2b以及端板侧的端部壁面的驱动轴15。
形成圆环状的外转子导向件3具有圆筒状贯通形成的外转子支承面3a、外周面3b、一对端面3c，以端面3c与端部壁面2b以及端板的端部壁面分别密接的状态配置于外壳2内。该外转子导向件3在一侧凹设有半圆筒形的轴承部16，在与其对置的另一侧突出成形有臂部17。外转子导向件3被与轴承部16卡合的轴18可摆动地保持于躯体部2A。在臂部17和躯体部2A之间配设有弹簧19。在与该弹簧19对置的一侧，在外周面3b和躯体部2A的周壁面2a之间划分出沿着外转子导向件3的长度方向的压力控制室20。上述弹簧19将外转子导向件3向压力控制室20缩小的方向施力。压力控制室20经由配设于臂部17前端部附近的密封片21从吸入口13侧被密封。
在形成圆筒状的外转子4的内周面4a，等间隔地设有六处截面圆形的板保持槽24。此外，也可以为不等间隔。另外，外周面4b由单纯的圆筒面构成，该外周面4b可旋转地嵌合于外转子支承面3a。此外，在外周面4b和外转子支承面3a之间，严格来说存在形成油膜的极微小的间隙。
可旋转地配置于外转子4的内周侧的内转子5具有由圆筒面构成的外周面5b、和贯通形成于中央的安装孔5c，在该安装孔5c上固定有驱动轴15。由于驱动轴15位于相对于外转子4的中心偏心的位置，所以内转子5在相对于外转子4偏心的位置与驱动轴15一体旋转。由于内转子5相对于外转子4偏心设置，从而在两者间划分出作为整体形成月牙状的空间。该空间与吸入端口11以及喷出端口12连通。另外，在外周面5b上以等间隔放射状地形成有六个沟槽25。
如图3所示，连结板6具有扩展成截面大致三角形的内周端6a、和形成截面圆形的外周端6b。将外周端6b可摆动地嵌合于外转子4的板保持槽24，并且将内周端6a可滑动地插入内转子5的沟槽25内，以将旋转力从内转子5向外转子4传递。通过六个连结板6将外转子4和内转子5之间的上述空间划分成六个腔室26。
上述的外壳2、外转子导向件3、外转子4以及内转子5均通过合成树脂或烧结金属形成。
在这样构成的可变容量泵1中，当经由驱动轴15使内转子5向图1中顺时针方向旋转时，该旋转力经由连结板6向外转子4传递，外转子4向同方向旋转。由于外转子4内周面4a和内转子5外周面5b之间的距离根据相互偏心的外转子4以及内转子5的旋转位置进行变化，所以各腔室26的容积也相应地进行变化。各腔室26的容积在图1的下侧为最小，通过从此向顺时针方向旋转而逐渐增加，在图1的上部成为最大后，再次减小。通过该腔室26的容积变化，得到从吸入端口11向喷出端口12压送油的抽吸作用。
另外，向压力控制室20内供给发动机的主油道内的油压或经由控制螺线管调压的控制油压。在压力控制室20内的油压低的情况下，如图1、3所示，外转子导向件3被弹簧19向压力控制室20缩小的方向施力，内转子5的偏心量增大，其结果是泵容量增加。另一方面，如果压力控制室20内的油压变高，则外转子导向件3抵抗弹簧19的弹力，向压力控制室20扩大的方向摆动，内转子5的偏心量减小，其结果是泵容量减小。
其次，参照图5～图8说明本发明的主要部分即外转子导向件3。
如图7、8所示，在由圆筒面构成的外转子支承面3a上形成有遍及两端面3c之间沿轴方向连续的两个凹部30，在这两个凹部30之间残存衬垫部29。即，衬垫部29是残存于两个凹部30之间的外转子支承面3a。该衬垫部29处于与圆弧状地延伸的吸入端口11的大致中央相对应的位置，以抑制配置于外转子导向件3内的外转子4的晃动的方式发挥作用。如图5、6所示，两个凹部30以作为整体收纳在吸入端口11的区域内即角度范围内的方式沿周方向延伸。另外，优选的是凹部30即使在泵工作时外转子导向件3摆动也位于吸入端口11的区域内。凹部30的半径方向的深度没有特别限定，但是为油膜的剪断力非常小的程度的深度。
在泵工作中，由于六个腔室26越接近喷出端口12压力越高，所以外转子4在外转子导向件3中被压向喷出端口12侧。其结果，与外转子4紧密接触的喷出端口12侧的外转子支承面3a的面压升高，另一方面，吸入端口11侧的外转子支承面3a的面压降低。因此，即使在与吸入端口11的区域相对应的外转子支承面3a上设置凹部30，也没有局部磨损的担心，因此，优选的是在吸入端口11侧的外转子支承面3a上设置凹部30。假如在与喷出端口12的区域相对应的外转子支承面3a上设置凹部30的情况下，面压会进一步升高，因此，考虑到该情况，不在与喷出端口12的区域相对应的外转子支承面3a上设置凹部30。
另外，在与吸入端口11和喷出端口12之间的区域相对应的外转子支承面3a上也未设置凹部30。这是因为，在上述区域设置凹部30的情况下，高压的油容易经由凹部30向低压侧漏出，可能会引起抽吸性能的降低。
在这样构成的外转子导向件3中，通过凹部30减小外转子支承面3a和外转子4的外周面4b之间的接触面积。
根据上述实施例，通过设置遍及外转子导向件3的两端面3c之间连续的两个凹部30，外转子导向件3的外转子支承面3a和外转子4的外周面4b之间的接触面积减小，因此，可以降低两者间的剪断阻力，进而可以减小驱动所需的扭矩。
另外，根据上述实施例，各凹部30由于遍及外转子导向件3的两端面3c之间沿轴方向连续，因此，在通过烧结或合成树脂进行成形时，可以使用模具容易并且廉价地成形。另外，外转子导向件3由于两端开口，所以通过机械加工也可以容易地加工凹部30。
而且，与设置沿周方向连续的凹部的情况相比，可以抑制高压的油经由凹部向低压的吸入侧漏出。
以上，说明了本发明的一实施例，但本发明不限于上述实施例，可以进行各种变更。
在本实施例中，在外转子支承面3a上形成有两个凹部30，但不限于此，也可以形成一个凹部30，也可以形成三个以上的凹部30。
另外，在本实施例中，在外壳躯体部2A的端部壁面2b上形成有吸入端口11以及喷出端口12，但本发明不限于此，可以将吸入端口11以及喷出端口12形成于端部壁面2b以及端板侧的端部壁面这双方，也可以仅形成于端板侧。另外，也可以将吸入端口11以及喷出端口12中的一个形成于端部壁面2b，将另一个形成于端板侧。
另外，本实施例中，在外转子4的内周面4a上等间隔地配设有六个板保持槽24，但也可以设置六个以外的数量的板保持槽24，另外，也可以不等间隔地配设板保持槽24。

Claims (3)

1.一种可变容量泵，其特征在于，具备：
外壳，其构成一对端部壁面，配置有贯通这些端部壁面的驱动轴，并且，在所述一对端部壁面中的至少一个上形成有吸入端口以及喷出端口；
圆环状的外转子导向件，其以端面密接于所述端部壁面的状态可摆动地配置于所述端部壁面间，贯通形成有所述驱动轴所通过的圆筒状的外转子支承面；
圆筒状的外转子，其具有由圆筒面构成的外周面，并且可旋转地嵌合于所述外转子支承面；
内转子，其配置于所述外转子的内周侧，在相对于该外转子偏心的位置与所述驱动轴一体旋转；
多个连结板，其将所述内转子和所述外转子连结，以将旋转力从所述内转子向所述外转子传递，并且将在所述外转子和所述内转子之间划分出的空间划分成多个腔室；
在所述外转子支承面上形成有遍及所述外转子导向件的两端面间沿轴方向连续的凹部。
2.根据权利要求1所述的可变容量泵，其特征在于，
所述凹部配设于所述吸入端口的区域内。
3.根据权利要求2所述的可变容量泵，其特征在于，
在所述吸入端口和所述喷出端口之间的区域未设置凹部。
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