Solenoid valve coil base structure for automobile drive-by-wire brake

Abstract

The utility model discloses a solenoid valve coil base structure for an automobile drive-by-wire brake, which comprises a coil, a controller shell is arranged on one side of the coil, a circular placement groove is arranged on the controller shell, a limiting column and an inward concave step surface are arranged in the circular placement groove, the limiting column is connected with a V-shaped spring base through interference fit, and the V-shaped spring base is connected with a V-shaped spring. The top end of the limiting column is in a forward conical step shape, the V-shaped spring base is attached to the coil, the electromagnetic valve is inserted into an inner hole of the coil, a valve block is arranged on the side, away from the coil, of the electromagnetic valve, and the controller shell is connected with the valve block through a bolt. Spherical pair contact is formed through a contact of a V-shaped spring base and an inwards-concave step face, up-down free movement is allowed, the V-shaped spring base is provided with supporting feet, when certain supporting force is provided, elastic deformation can be generated, a coil is allowed to deflect in a self-adaptive mode within the range of + / -3 degrees, and a limiting column of a controller shell provides axial limiting. And the radial movement of the V-shaped spring base is inhibited.

Description

Technical Field

[0001] This utility model relates to the field of automotive brake-by-wire technology, specifically to a solenoid valve coil base structure for automotive brake-by-wire devices. Background Technology

[0002] In automotive brake-by-wire systems, a control coil drives or releases a solenoid valve to control the flow of brake fluid in the pipeline, achieving braking and other related coordinated actions according to a predetermined design. The coil and solenoid valve, as core transmission components, directly affect the braking response speed, accuracy, and reliability due to their performance in tandem. However, the fixed structure of the controller's plastic housing in traditional brake-by-wire systems presents several industry challenges that urgently need to be addressed:

[0003] Rigid fixing defects: Traditional epoxy resin potting or bolt fastening is prone to thermal stress concentration, which can lead to cracks and deformation after long-term use;

[0004] Insufficient assembly tolerance: When the deviation between the coil and the cylindrical axis of the solenoid valve is greater than 0.5mm, jamming is likely to occur;

[0005] The heat conduction path is singular: the heat of the coil is conducted only through the valve block, and the magnetic force attenuates significantly when the temperature rise is greater than 85°C. Utility Model Content

[0006] The purpose of this invention is to provide a solenoid valve coil base structure for automotive brake-by-wire systems, in order to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a solenoid valve coil base structure for an automotive brake-by-wire device, comprising a coil, a controller housing on one side of the coil, a circular mounting groove on the controller housing, a limiting post and a concave stepped surface within the circular mounting groove, the limiting post being connected to a V-shaped spring base via an interference fit, the top of the limiting post being a positive conical step shape, the V-shaped spring base being in contact with the coil, a solenoid valve being inserted into the inner hole of the coil, a valve block being provided on the side of the solenoid valve away from the coil, and the valve block being connected to the controller housing via bolts.

[0008] Preferably, the V-shaped spring base includes a central fixing hole and a support foot, the contact point of the support foot contacts the concave stepped surface to form a spherical contact, the V-shaped spring base is made of 60Si2MnA spring steel, and the support foot is silver-plated.

[0009] Preferably, the solenoid valve is connected to the coil with a clearance fit.

[0010] Preferably, the valve block is provided with a valve slot, and the end of the solenoid valve is equipped with a flange, and the outer end face of the valve slot is pressed by a riveting tool.

[0011] Compared with the prior art, the beneficial effects of this utility model are: the contact point of the V-shaped spring base forms a spherical pair contact with the concave step surface, allowing free vertical movement; the V-shaped spring base is equipped with a support foot, which provides a certain support force while generating elastic deformation, allowing the coil to self-adaptively deflect within a range of ±3°; the limiting post of the controller housing provides axial limitation and suppresses radial movement of the V-shaped spring base.

[0012] Heat can be transferred from the rear end face of the coil to the contact point of the support foot, and then to the controller housing; or it can be transferred from the front end face of the coil to the valve block, and then to the brake fluid through the valve block, thus achieving multi-path heat conduction.

[0013] The pin holes on the controller housing and the coil power supply terminals form a circumferential reference positioning, and the limiting posts on the controller housing provide blind insertion guidance for the V-shaped spring base, making assembly convenient. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the exploded structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the installation of the V-shaped spring base of this utility model;

[0016] Figure 3 This is a schematic diagram of the controller housing structure of this utility model;

[0017] Figure 4 This is a schematic diagram of the V-shaped spring base structure of this utility model;

[0018] Figure 5 This is a cutaway diagram of the V-shaped spring base of this utility model.

[0019] In the diagram: 1. Controller housing; 11. Limiting post; 12. Concave stepped surface; 2. V-shaped spring base; 21. Center fixing hole; 22. Support leg; 3. Coil; 4. Solenoid valve; 5. Valve block. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0021] Please refer to 1-4. One embodiment of this utility model is provided: a solenoid valve coil base structure for an automotive brake-by-wire device, including a coil 3. A controller housing 1 is provided on one side of the coil 3. A circular mounting groove is provided on the controller housing 1. A limiting post 11 and an inwardly recessed stepped surface 12 are provided in the circular mounting groove. The limiting post 11 is connected to a V-shaped spring base 2 by an interference fit, with an interference amount of 0.02~0.05mm. The top of the limiting post 11 is in the shape of a positive conical step. The diameter of the limiting post 11 is Φ5±0.01mm, the positive conical step is 15°±1°, and the surface roughness is Ra0.8. The conical step fixes the position of the V-shaped spring base 2. The V-shaped spring base 2 is in contact with the coil 3. A solenoid valve 4 is inserted into the inner hole of the coil 3. A valve block 5 is provided on the side of the solenoid valve 4 away from the coil 3. The controller housing 1 is connected to the valve block 5 by bolts.

[0022] The V-shaped spring base 2 includes a central fixing hole 21 and support legs 22. The V-shaped spring base 2 is manufactured as a single piece, and the support legs 22 are symmetrically distributed to form a V-shaped structure. The opening angle of the two support legs 22 is 112°±2°. The contact points of the support legs 22 contact the concave stepped surface 12 to form a spherical contact with a friction coefficient μ=0.08~0.12. High-temperature resistant grease can be applied to the contact surface. The V-shaped spring base 2 is made of 60Si2MnA spring steel, which is quenched and tempered at +420℃, with a hardness of HRC42~45. The support legs 22 are silver-plated with a silver plating layer thickness of 3~5μm. The silver plating has high thermal conductivity and high-temperature oxidation resistance.

[0023] The solenoid valve 4 is connected to the coil 3 with a clearance of 0.1 to 0.3 mm on one side. The flexible limit of the V-shaped spring base allows the coil 3 to swing and tilt freely at a small angle, so as to achieve ±3° deflection of the cylinder of the solenoid valve 4 in the X / Y axis direction. The measured axial displacement is ≤0.15 mm @ 20G vibration.

[0024] The adaptive formula for the fit clearance between the cylinder and the inner hole of the solenoid valve as a function of temperature:

[0025] Δd=α·L·ΔT (where α=11.5×10- 6 / ℃, L=15mm, ΔT=working temperature rise).

[0026] The valve block 5 has a valve slot. The end of the solenoid valve 4 is fitted with a flange. A riveting tool is used to press the outer end face of the valve slot, and through plastic deformation of the material, it covers the end flange of the solenoid valve 4, achieving reliable fixation of the solenoid valve. The axial riveting pressure is 70KN, and the displacement is 0.7±0.1mm. The riveting pressure is 70KN, and the displacement is 0.7 +0.2 / -0.1mm. The end of the solenoid valve 4 is connected to the valve block 5 via an interference fit, with an interference fit of 0.01~0.03mm. The axial preload is 3000N, and the displacement is +0.1~+0.2mm.

Claims

1. An electromagnetic valve coil base structure for a motor vehicle brake-by-wire, comprising a coil (3), characterized in that: A controller housing (1) is provided on one side of the coil (3). A circular mounting groove is provided on the controller housing (1). A limiting post (11) and an inwardly recessed step surface (12) are provided in the circular mounting groove. The limiting post (11) is connected to a V-shaped spring base (2) by an interference fit. The top of the limiting post (11) is a positive conical step shape. The V-shaped spring base (2) is in contact with the coil (3). A solenoid valve (4) is inserted into the inner hole of the coil (3). A valve block (5) is provided on the side of the solenoid valve (4) away from the coil (3). The controller housing (1) is connected to the valve block (5) by bolts.

2. The solenoid valve coil base structure for a vehicle brake-by-wire according to claim 1, characterized by: The V-shaped spring base (2) includes a central fixing hole (21) and a support leg (22). The contact point of the support leg (22) contacts the concave step surface (12) to form a spherical contact. The V-shaped spring base (2) is made of 60Si2MnA spring steel, and the support leg (22) is silver plated.

3. The solenoid valve coil base structure for a vehicle brake-by-wire according to claim 1, characterized in that: The solenoid valve (4) is connected to the coil (3) with a clearance fit.

4. The solenoid valve coil base structure for a vehicle brake-by-wire according to claim 1, characterized by: The valve block (5) is provided with a valve slot, and the end of the solenoid valve (4) is equipped with a flange, and the outer end face of the valve slot is squeezed by a riveting cutter.

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