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KR-20260064706-A - Electrically driven solenoid valve

KR20260064706AKR 20260064706 AKR20260064706 AKR 20260064706AKR-20260064706-A

Abstract

The present invention relates to an electrically actuated solenoid valve for open-loop and/or closed-loop control of a pressure medium connection within a hydraulic unit of an electronically slip-controlled vehicle braking system. For this purpose, known solenoid valves have a valve insert (12) composed of a lower portion (14) having a control cross-section (22) and an upper portion (16) for guiding a tappet (24). A closing member (24a) for controlling the control cross-section (22) is coupled to the tappet (24). For valve operation, a solenoid coil acts on a magnetic armature (34), and this magnetic armature acts on the tappet (24) by resisting the force of a reset element (26). A lower portion (14) having an end section (14a) inserted into a lower receiving portion (16a) of the upper portion (16) is proposed. The end section (14a) has at least one recess (44) open toward the upper (16), and this recess penetrates the wall of the lower (14) radially. The proposed lower (14) reduces the overall height of the valve insert (12) inside the housing block (40) without adversely affecting the flow resistance, magnetic transition, or stability of the valve insert (12) of the solenoid valve, and further enables a cost-effectively manufacturable hydraulic unit.

Inventors

  • 리스플러 플로리안
  • 베 안드레아스
  • 에어틀레 마쿠스

Assignees

  • 로베르트 보쉬 게엠베하

Dates

Publication Date
20260507
Application Date
20240621
Priority Date
20230901

Claims (10)

  1. In particular, it is an electrically actuated solenoid valve for open-loop and/or closed-loop control of pressure medium connections within a hydraulic unit of an electronically slip-controlled vehicle braking system, and such a solenoid valve is, A valve insert (12) comprising a lower portion (14) having a control cross-section (22) and an upper portion (16) connected to the lower portion (14) and for guiding a tappet (24), A closing member (24a) combined with a tappet (24) and for controlling a control cross section (22) and Having an operable magnetic armature (34) that operates the tappet (24) by resisting the force of the reset element (26), In an electrically actuated solenoid valve, A lower part (14) having an end section (14a) can be inserted into an allocated lower receiving part (16a) of an upper part (16), and An electrically driven solenoid valve characterized in that the end section (14a) has at least one recess (44) open toward the upper (16), and the recess penetrates the wall of the lower (14) in a radial direction.
  2. In paragraph 1, An electrically driven solenoid valve characterized in that the recess (44) joins into a longitudinal channel (45) formed on the outer circumference of the lower part (14).
  3. In paragraph 1 or 2, An electrically driven solenoid valve characterized in that, when viewed in the direction of the longitudinal axis of the valve insert (12), the lower receiving portion (16a) of the upper portion (16) is arranged at the height of the riveting flange (16c).
  4. In any one of paragraphs 1 through 3, An electrically driven solenoid valve characterized in that the lower part (14) and the upper part (16) can be manufactured by molding technology, particularly by cold forming technology.
  5. In any one of paragraphs 1 through 4, An electrically driven solenoid valve characterized in that the lower (14) and upper (16) are preferably connected to each other in a form-joined and/or force-joined manner by mutual press-fitting.
  6. In any one of paragraphs 1 through 5, A valve body (20) is inserted into the lower portion (14), and a control cross-section (22) of a solenoid valve is formed in the valve body. An electrically actuated solenoid valve characterized in that the valve body has a reset element (26) axially supported by a first end of its own ends.
  7. In any one of paragraphs 1 through 6, An electrically actuated solenoid valve characterized in that the tappet (24) has an annular shoulder (24b), and the annular shoulder has a reset element (26) supported by a second end of its ends.
  8. In any one of paragraphs 1 through 7, An electrically driven solenoid valve characterized in that a reset element (26) is arranged between a tappet (24) and a valve body (20) within a section of a valve chamber (18) permeated by a pressure medium.
  9. In any one of paragraphs 6 through 8, An electrically actuated solenoid valve characterized in that the lower part (14) has an inner diameter that slopes inward from the outside in a stepped shape at its end far from the upper part (16), and a filter element (32a) is fixedly arranged in the axial direction within one diameter stepped section.
  10. In Paragraph 9, An electrically driven solenoid valve characterized in that the valve body (20) and the filter element (32a) are each fixed inside the lower part (14) in a forced coupling and/or shape coupling manner.

Description

Electrically driven solenoid valve The present invention belongs to the field of the art of electronically slip-controllable vehicle braking systems and relates to an electrically actuable solenoid valve according to the feature of the preamble of claim 1, wherein such a solenoid valve is used to release or disconnect a pressure medium connection within a hydraulic unit in such vehicle braking systems. Multiple solenoid valves of this type are arranged in the housing block of the hydraulic unit for this purpose, together with an electrically driven motor similar to that of a braking pressure generator, and receive electrical energy as needed by an electronic control device according to a detected sensor signal. The solenoid valve according to the present invention is preferably provided to control a pressure medium connection between the master brake cylinder and the wheel brakes of a brake circuit of a vehicle braking system. During normal operation, the solenoid valve disconnects such a pressure medium connection, thereby disconnecting the driver from the wheel brakes. In the event of a malfunction, the solenoid valve releases such a pressure medium connection, so that, as a result, braking pressure into the wheel brakes is generated by the driver's muscle force, and the vehicle can be braked despite the presence of an electrical malfunction. Electrically actuated solenoid valves according to the features of the preamble of claim 1 are sufficiently known from the prior art. For example, in this regard, reference is made to the disclosure of DE 10 2018 219 955 A1. In the case of the solenoid valve disclosed herein, the valve housing or valve insert is implemented as a multi-part form for cost reasons and accordingly includes an upper and a lower portion. The two housing portions are formed as hollow cylinders and overlap in a section along their length by projections facing each other. A first projection is formed on the upper portion and engages with a receiving portion in a second projection on the lower portion. On the upper portion, a tappet that supports the closing body of the solenoid valve at its end is slidably guided. On the lower portion, a control cross-section of the solenoid valve controlled by the closing member is arranged. To realize a pressure medium connection between a first pressure medium connection arranged on the front of the valve insert away from the armature and a second pressure medium connection arranged around the periphery of the valve insert, groove-shaped forming sections are provided at the upper end downstream of the control cross section. Such groove-shaped forming sections are subdivided into an axial groove section in an area where the upper and lower sections overlap axially or a press connection exists, and a radial groove section to which the aforementioned axial groove section is joined by one of its ends. When viewed in the longitudinal direction of the solenoid valve, the radial groove section is arranged over the area where the upper and lower sections overlap each other, and thus prevents a possible reduction in the total axial length of such solenoid valve. The reason for this is that inserting the radial groove section deeper into the upper portion can weaken the cross-section of the valve insert in the area where the valve flange of the solenoid valve is formed and where the solenoid valve is riveted to the housing block. As a result, the radial riveting force generated may be absorbed more poorly or dissipated more poorly into the housing block. Furthermore, the change in the cross-section of the valve insert caused by the deeper inserted radial groove sections affects the magnetic transition between the upper and lower sections and can lead to a reduction in the magnetic force provided by the magnetic circuit. Finally, the deeper radial groove sections at the top result in strong flow deflection inside the valve chamber, and this situation increases the flow resistance of the solenoid valve. FIG. 1 shows a cross-sectional view of a valve assembly formed according to the present invention of an electrically actuable solenoid valve. This valve assembly is housed within a valve receiving portion of a housing block, and FIG. 1 shows a peripheral region of this valve receiving portion from the housing block. In FIG. 2, the lower part of the solenoid valve according to the present invention as an individual part is shown in a perspective view looking at the front of the lower part facing upward. The valve assembly (10) illustrated in FIG. 1 is shown without a solenoid coil attached thereto for simplification. It is assumed that an annular solenoid coil, not shown in the drawing, surrounding a so-called valve dome protruding over the outer surface of the housing block (40), may be mounted on the valve assembly (10). The valve assembly (10) and the solenoid coil together form the solenoid valve that forms the basis of the present invention. The valve assembly (10)