Abstract: A pump device includes: a drive shaft; a pump element; a pump housing including; a pump element receiving space, first and second bearing receiving spaces, a suction passage, a discharge passage, a return passage, and a seal receiving space, a first bearing including a first lubrication groove, received within the first bearing receiving space, and supporting the drive shaft; a second bearing which includes a second lubrication groove having a sectional area that is perpendicular to the rotation axis, and that is greater than a sectional area of the first bearing that is perpendicular to the rotation axis, which is received within the second bearing receiving space, and which supports the drive shaft; and a seal member provided within the seal receiving space, and arranged to seal between the drive shaft and the pump housing.

Abstract: A pump device includes: a drive shaft; a pump element; a pump housing including; a pump element receiving space, first and second bearing receiving spaces, a suction passage, a discharge passage, a return passage, and a seal receiving space, a first bearing including a first lubrication groove, received within the first bearing receiving space, and supporting the drive shaft; a second bearing which includes a second lubrication groove having a sectional area that is perpendicular to the rotation axis, and that is greater than a sectional area of the first bearing that is perpendicular to the rotation axis, which is received within the second bearing receiving space, and which supports the drive shaft; and a seal member provided within the seal receiving space, and arranged to seal between the drive shaft and the pump housing.

Abstract: A tank-integrated pump unit includes a reservoir tank fixed to a pump body. The body of the reservoir tank includes an introduction opening for introducing working fluid from an external hydraulic device into the body. A filter member is arranged in the body for filtering working fluid introduced through the introduction opening. A suction passage connection portion is connected to a suction hole of a pump body. The suction passage connection portion includes a body-side opening through a wall of the body. The body-side opening is located below a predetermined level of working fluid and above a lowermost position in the body. A pressure chamber is defined in the body, and located below the body-side opening of the suction passage connection portion. The introduction opening faces the pressure chamber. The filter member covers an upper side of the pressure chamber.

Abstract: A tank-integrated pump unit includes a reservoir tank fixed to a pump body. The body of the reservoir tank includes an introduction opening for introducing working fluid from an external hydraulic device into the body. A filter member is arranged in the body for filtering working fluid introduced through the introduction opening. A suction passage connection portion is connected to a suction hole of a pump body. The suction passage connection portion includes a body-side opening through a wall of the body. The body-side opening is located below a predetermined level of working fluid and above a lowermost position in the body. A pressure chamber is defined in the body, and located below the body-side opening of the suction passage connection portion. The introduction opening faces the pressure chamber. The filter member covers an upper side of the pressure chamber.