Hydraulic pump

• US 7,611,337 B2
• Filed: 06/16/2004
• Issued: 11/03/2009
• Est. Priority Date: 12/19/2003
• Status: Active Grant

• Current Assignee: Annovi Reverberi SpA
• Original Assignee: Annovi Reverberi SpA
• Inventors: Fabbri, Fabrizio, Rocchi, Alberto, Reverberi, Stefano
• Primary Examiner(s): Kramer; Devon C
• Assistant Examiner(s): STIMPERT, PHILIP EARL
• Application Number:
  US10/867,638
• Publication Number:
  US 20050135953A1
• Time in Patent Office: 1,966 Days
• Field of Search: 417/269, 417/521, 417/529, 417/360, 92/71
• US Class Current: 417/269
• CPC Class Codes: F04B 1/145 Housings

Abstract

Pump, comprising a casing that is generally cup-shaped intended to be fixed to a driving motor (3), and containing a drive shaft (6) suitable for being coupled with said motor, and having a tilted surface for the actuation of one or more pistons (7) that move parallel to the axis of said drive shaft, where said casing consists of a monolithic body (2) that comprises means (4) for its attachment to said motor, a system for supporting and holding said drive shaft, and the guide and sliding seats of the quoted pistons.

Claims

1. A pump, comprising a casing that is generally cup-shaped adapted to be directly fixed to a driving motor (3), and containing a drive shaft (6) adapted to engage said motor having a tilted surface to actuate one or more pistons (7) that move parallel to the axis of said drive shaft;

wherein each of said pistons is slidably mounted with interposition of a sealing element directly in a guide sleeve formed in one piece with said casing;

wherein said casing is a monolithic body fully open at one end having radial appendices formed in one piece therewith which directly engage said monolithic body to said motor;

wherein a system which supports and holds said drive shaft includes a bearing located near said open end of the casing and retained in position between a shoulder of the casing and an elastic Seeger ring constrained in a circumferential throat in said casing; and

wherein said casing has internal dimensions transverse to the axis of said drive shaft, and said drive shaft and said system which supports and holds said drive shaft have external dimensions transverse to the axis of said drive shaft, configured to enable said pistons, said drive shaft and said system which supports and holds said drive shaft to be installed in said casing via said open end of said casing.

2. The pump according to claim 1, wherein said radial appendices extend radially from the monolithic body and are equipped with engagement seats for respective devices for locking to the motor.

3. The pump according to claim 1, wherein the bearing placed between said monolithic body and drive shaft is kept between a shoulder of said body and a broken elastic ring.

4. The pump according to claim 3, wherein the outer annular part is received in a respective seat of the monolithic body, and axially locked here, and an inner annular part abuts a collar extending from said tilted surface.

5. Pump according to claim 1, wherein a mouth of said monolithic body is closed airtight by an annular gasket placed between a seat of the bearing and the drive shaft.

6. The pump according to claim 1, wherein said guide sleeve has a sleeve that is realised in a single piece with a bottom of said monolithic body, which is completely contained in the latter, wherein an outer mouth of said sleeve has a seat for at least one said sealing element for the respective piston.

7. The pump according to claim 1, wherein the bearing has ball bearings therein having axes of rotation parallel to the axis of the drive shaft.