Methods for the production of a pressure pipe of an electric hoisting magnet and pressure pipe of a hoisting magnet

• US 7,266,883 B2
• Filed: 02/07/2003
• Issued: 09/11/2007
• Est. Priority Date: 02/22/2002
• Status: Expired due to Fees

• Current Assignee: Bosch Rexroth AG (Robert Bosch GmbH)
• Original Assignee: Bosch Rexroth AG (Robert Bosch GmbH)
• Inventors: Schempp, Roland, Sanzenbacher, Hermann, Baerenwaldt, Uwe
• Primary Examiner(s): Barrera; Ramon M.
• Application Number:
  US10/501,063
• Publication Number:
  US 20050068136A1
• Time in Patent Office: 1,677 Days
• Field of Search: 335/255, 335/281, 251/129.15, 296/07
• US Class Current: 29/607
• CPC Class Codes: F16K 31/426 the actuated valves being cylindrical sliding valves
• CPC Class Codes: H01F 7/127 Assembling
• CPC Class Codes: Y10T 29/49075 including permanent magnet or core

Abstract

The invention discloses methods for the production of pressure pipes of a tractive solenoid for a hydraulic valve and pressure pipes that are manufactured using these methods, wherein the pressure pipes are thermally joined.

Claims

1. A method for producing a pressure pipe of a tractive solenoid for a hydraulic valve, which pressure pipe has a pole piece (31), a nonmagnetic intermediary piece (33), a tubular piece (35), and a stroke limiter (36), and has a receptacle (37) for an armature (38) that cooperates with a tappet (39), characterized in that the nonmagnetic intermediary piece (33) is thermally joined at its ends to the pole piece (31) and the tubular piece (35) in such a way that after the joining, a sliding surface (43) for the armature (38) is formed, and in that the armature (38) is introduced into the receptacle region (37) before the pole piece (31), the intermediate piece (33), and the tubular piece (35) are joined to one another.

2. The method according to claim 1, characterized in that the intermediate piece (33) is welded to the pole piece (31) and the tubular piece (35).

3. The method according to claim 2, characterized in that a capacitor discharge welding process is used.

4. The method according to claim 1, characterized in that the pole piece (31), the intermediate piece (33), and the tubular piece (35) are vertically aligned during the joining process.

5. The method according to claim 1, characterized in that the stroke limiter (36) is thermally joined to the tubular piece (35).

6. The method according to claim 1, characterized in that the stroke limiter (36) and the tubular piece (35) are made of one piece.