Electromagnet and hydraulic valve comprising such an electromagnet

• US 6,484,998 B1
• Filed: 08/10/2001
• Issued: 11/26/2002
• Est. Priority Date: 02/22/1999
• Status: Expired due to Fees

• Current Assignee: Bosch Rexroth AG (Robert Bosch GmbH)
• Original Assignee: Bosch Rexroth AG (Robert Bosch GmbH)
• Inventors: Schäffer, Rudolf
• Primary Examiner(s): Yuen, Henry C.
• Assistant Examiner(s): Bastianelli, John
• Application Number:
  US09/913,399
• Time in Patent Office: 473 Days
• Field of Search: 251/129.09, 251/129.15, 251/129.2, 251/65, 335/279, 335/276, 335/275, 137/625.65
• US Class Current: 251/65
• CPC Class Codes: H01F 7/1607 Armatures entering the winding

Abstract

A solenoid valve (50) has a valve housing (51) with a valve slide (53) in which two magnets, with one pole (1) each, are inserted. The poles (1) each have a coil core (8, 9) which extends along a longitudinal axis (10) and in which in each case one armature tappet (17), which activates one end of the valve slide (53) with an activation end (27), is provided. Arranged on each armature tappet (17) is a magnet armature (23) which has two armature side faces (24, 25) which extend obliquely with respect to the longitudinal axis (10). The coil core (8, 9) has two core side faces (12, 19) which extend parallel to one armature side face (24, 25) in each case.

Claims

1. An electromagnet, for actuating a hydraulic solenoid valve (50), having a coil core (8, 9) of an electrical coil in a region of the coil core, which coil core is made of magnetizable material and extends along a longitudinal axis (10), the electromagnet also having the following features:

an armature tappet (17) which extends essentially parallel to said longitudinal axis (10) is provided in a tappet opening (16) which extends in the interior of the coil core (8, 9)

at least one magnet armature (23) is provided on the armature tappet (17), said magnet armature (23) having at least one armature side face (24, 25) which cuts through the longitudinal axis (10) at an angle other than 90°

, and

the coil core (8, 9) is interrupted in a region of the magnet armature (23).

2. The electromagnet as claimed in claim 1, wherein the magnet armature has two armature side faces (24, 25) which are cut from the longitudinal axis (10) at an angle other than 90°

.

3. The electromagnet as claimed in claim 2, wherein the two armature side faces (24, 25) are constructed so as to be symmetrical with respect to a plane (20) which extends perpendicularly to the longitudinal axis (10).

4. The electromagnet as claimed in claim 1, wherein the coil core (8, 9) has at least one core side face (12, 19) which cuts through longitudinal axis (10) at an angle other than 90°

.

5. The electromagnet as claimed in claim 4, wherein the coil core (8, 9) has two core side faces (12, 19) which are cut through the longitudinal axis (10) at an angle other than 90°

.

6. The electromagnet as claimed in claim 5, wherein the two core side faces (12, 19) are constructed so as to be symmetrical with respect to a plane (20) which extends perpendicularly to the longitudinal axis (10).

7. The electromagnet as claimed in claim 4, wherein in each case one armature side face (24, 25) extends essentially parallel to, in each case, one core side face (12, 19).

8. The electromagnet as claimed in claim 1, wherein a connecting region (14) which has antimagnetic material is provided in the interrupted region of the coil core (8, 9).

9. The electromagnet as claimed in claim 8, wherein a connecting region which has magnetizable material (62, 64) is provided in the interrupted region of the coil core (8, 9).

10. The electromagnet as claimed in claim 8, wherein the connecting region (14) has a tubular shape and connects interrupted sections of the coil core to one another.

11. The electromagnet as claimed in claim 1, wherein a first end of the armature tappet (17) is permanently connected to a first end (11) of the coil core (8, 9).

12. The electromagnet as claimed in claim 11, wherein a second end of the armature tappet (17) projects beyond a second end (18) of the coil core (8, 9).

13. The electromagnet as claimed in claim 1, wherein two electrical coils which are arranged coaxially with respect to one another are provided.

14. The electromagnet as claimed in claim 1, wherein at least three different operating voltages are applicable to the electrical coil (3) or electrical coils.

15. The electromagnet as claimed in 1, further comprising a permanent magnet (78) arranged in the region of the coil core.