Pump device, for instance for front and rear wheel driven motorcycle

Abstract

A pump arrangement is arranged to be driven by a rotating shaft and comprises a piston arrangement that generates a flow pulse. The piston arrangement has pistons that move axially forward and backward. An actuating device is connected to the rotating shaft and drives the piston arrangement. The actuating device has a cross section of constant width with at least three corners. During rotation caused by the rotating shaft, the actuating device is arranged to interact with carrier devices that are associated with the pistons.

1 - 10 . (canceled) 
   
   
       11 . A hydraulic pump arrangement comprising a housing, the housing defining a first partial space and a second partial space, a rotatable input shaft extending into the first partial space, an actuating device connected to the rotatable input shaft so that rotation of the input shaft causes rotation of the actuating device, the actuating device adapted to contact at least one axially moveable piston, the actuating device being arranged in the first partial space of the housing, the second partial space being generally cylindrical, the at least one piston being axially moveable within the generally cylindrical second partial space and being adapted to generate a flow pulse of medium, the second partial space comprising at least one medium outlet and at least one medium inlet, the actuating device comprising a cross section comprising at least three corners, each corner being spaced from an opposite peripheral surface of the cross section by a first distance, the first distance being the same along the opposite peripheral surface, the peripheral surfaces of the actuating device being arranged to interact with at least one carrier device that is connected to the at least one piston, the outlet from the second partial space at the upper side of the at least one piston is connected to a valve arrangement arranged to pass the flow pulses generated by the at least one piston. 
   
   
       12 . The arrangement as claimed in  claim 11 , wherein one or more second partial spaces are connected to a first hydraulic system and one or more second partial spaces are connected to a second hydraulic system that is not in fluid communication with the first hydraulic system. 
   
   
       13 . The arrangement as claimed in  claim 12 ; wherein the valve arrangement comprises at least one spring-loaded device that is adapted to be opened and closed to control flow through the valve arrangement. 
   
   
       14 . The arrangement as claimed in  claim 11 , wherein the at least one piston is provided with an internal passage extending between an underside and an upper side of the at least one piston, a part acted upon by a spring is adapted to close the passage against the action of a spring when the part is in a first position and the part adapted to enable the passage to open when the part is in a second position. 
   
   
       15 . The arrangement as claimed in  claim 11 , wherein the at least one carrier device comprises a yoke that cannot rotate but that is able to move in the longitudinal directions of the at least one piston, and the actuating device rotating in relation to flanges of the yoke in response to rotation of the shaft. 
   
   
       16 . The arrangement as claimed in  claim 11 , wherein the at least one piston comprises two or more pistons. 
   
   
       17 . The arrangement as claimed in  claim 11 , wherein the cross section comprises an odd number of corners. 
   
   
       18 . The arrangement as claimed in claim  1 , wherein the pump arrangement is reduced in volume and is positioned on a motorcycle in a space located on one lateral side of the motorcycle and between an attachment point for a rear wheel pivot arm and a motor.