MXPA97002067A - Solenoid assembly for antisujec braking system - Google Patents

Abstract

The present invention relates to a solenoid assembly for an anti-grab braking system, comprising: a housing having a cavity, a plurality of solenoids, each of the solenoids comprising a coil, a coil wound around the coil, and a can to receive the coil that is received inside the cavity, and an overmold that wraps together the coil, the coil and the boat and that is disposed between the can and the housing, for each of the solenoids, in order to provide an elastic force for each of the solenoids

Description

SOLENOID ASSEMBLY FOR ANTISU EC ION BRAKING SYSTEM BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates generally to coil solenoid assemblies and, specifically, to a lenoid assembly for an anti-restraint system, 2. Description of Related Art It is known to provide a pair of solenoid assembly for an anti-grab braking system in a motor vehicle. Typically, the solenoid assembly includes a housing, solenoids and conductors that electrically connect the solenoids to a centreboard of an electronic control unit. Each snode includes coil windings and a coil contained within a boat. The solenoid assembly includes a retaining ring, which includes retaining spring closures, associated with each solenoid to retain removable between each solenoid in the housing. Each solenoid is further mounted to an elastomeric package which seals around an adjustment space, opens to the circuit board and deflects the solenoid against its corresponding valve of a hydraulic control unit. Even though the previous solenoid assembly has worked well, it suffers from the disadvantage that there is an ex traction effort during disassembly of the electronic control unit. from the hydraulic control unit. Another disadvantage of the solenoid assembly is that the solenoids can be displaced after disassembly. Yet another disadvantage of the solenoid assembly is that a spring rubber component is used that results in increased material cost. Still another disadvantage of the solenoid assembly is that the solenoids are overmoulded in polia ida what is not desired. A further disadvantage of the solenoid assembly is that the assembly time is relatively intense.

SUMMARY OF THE INVENTION Accordingly, the present invention is a solenoid assembly for an anti-grab braking system that includes a housing having a cavity and a plurality of solenoids, each of the solenoids being received within the cavity. The solenoid assembly also includes an overmold disposed between the housing and each of the solenoids to provide an elastic force for each of the solenoids. A particularity of the present invention is that a new and improved solenoid assembly is provided for a subject of anti-grab braking. Another particularity of the present invention is that a spring and protrusion closure in the coil and housing retain the solenoid in position during the disassembly of the electronic control unit from the hydraulic control unit, eliminating the extraction effort on the drivers. Still another feature of the present invention is that a relatively relatively soft overmold material is used as a binder to retain the canister and wire / coil of the solenoid together and to provide passivation of the node sun and will act as a spring for hold the solenoid in position and remove the extra spring rubber component. Yet another feature of the present invention is that fingers in the housing contain the true solenoid position for facilitating the assembly of the electronic control unit to the hydraulic control unit and providing tension in the sun to prevent wobbling during the boarding and handling. A further particularity of the present invention is that a solid bronze pin driver extends from the solenoids with a bend in the directions x, y and z, however, is strong enough to facilitate assembly. A still further feature of the present invention is that the solenoid assembly requires fewer processing steps for sanding, resulting in less work, installation investment and tools. Other features and advantages of the present invention will be readily appreciated as it becomes better understood after reading the subsequent description, taken in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a detailed perspective view of the solenoid assembly, in accordance with the present invention illustrated in operational relationship with an electronic control unit and hydraulic control unit. Figure 2 is a plan view of the so-node assembly and electrical control unit of Figure 1. Figure 3 is a sectional view, taken along line 3-3 of Figure 2. Figure 4 is an enlarged view of circle 4 of figure 3. Figure 5 is a sectional view, taken along line 5-5 of Figure 2. Figure 6 is an amplified view of circle d from 1 to figure 5. Figure 7 is a fragmentary partial view of a portion of the solenoid assembly and electronic control unit and hydraulic control unit of Figure 1, illustrating the assembly and disassembly.

DESCRIPTION OF THE PREFERRED MODALITIES With reference to the drawings and in particular to Figures 1 and 2, one embodiment of a solenoid assembly 10, in accordance with the present invention, is illustrated in relation to or rational with an electronic control unit, generally in each in 12 and a hydraulic control unit, usually ind 14. The electronic control unit 12 includes a thermal plate 16, wiring or printed circuit board 18 and a cover 20. The hydraulic control unit 14 includes a plurality of valves having valve seats 22 and rods 24. of valve, one for each valve, retained in a valve block 26. It should be noted that the solenoid assembly 10 is paired between the hydraulic control unit 14 and the electronic control unit 12 and secured together by appropriate elements such as fasteners (not shown). It should also be noted that the hydraulic unit 14 and the electronic control unit 12 are conventional and known in the field. Referring to Figures 1 to 6, the solinoid assembly 1 includes a housing 28 having a generally rectangular configuration. and a base wall 30 extending generally planar and perpendicular thereto to form a cavity 32. The base wall 30 has a plurality of openings 34 extending therethrough and a projection 35 extending therethrough. to each of the openings 34 for a function to be described. The base wall 32 has at its center, preferably a plurality of coil or solenoid retention fingers 36 extending upwardly from the base wall 32 and into the function cavity 32 to be described. It should be noted that the base wall 30, the protrusions 35 and the fingers 36 are integral and are formed as one piece.

Set. 10 of solenoid also includes when joining, preferably a plurality of coils or solenoids, generally indicated at 38. Each solenoid 38 includes a bobbin 40 having a generally cylindrical configuration. The bina 40 has an axially extending stem portion 42 and a flange portion 44 extending radially to the end portion of the stem portion 42. The portion 42 of vastag includes a Dasage 43 extending axially therethrough. The spool 40 also includes an axially extending spring retainer portion 45 for engaging the projection 3 to hold the spool 40 to the housing 28 to retain the solenoid 38 in place. The coil 40 is made of a plastic material such as nylon or polyamide. Each solenoid 38 also includes a coil or windings 46 wrapped around the rod portion 42 of the coil 40. The coil 46 is preferably made of a conductor wire such as copper. It should be noted that coil 46 creates a magnetic field when it receives electric current through itself. Each solenoid 38 includes a can 48 to receive the bina 40. The can 48 has a generally cylindrical configuration and a lower wall 50 that forms a cavity. The bottom wall has at least one opening 52 extending therethrough. The can 48 is made of a metallic material. Each solenoid 38 also includes at least one, of Preferably a plurality of conductive conductors or wires 54 extending from the coil 46 and through the aperture 52 in the bottom wall 50 of the can 48. The conductors 54 connect the coil 46 to the printed circuit board 18 to receive electric current. from it. Each conductor 54 is made of a conductive material such as a bronze material. Each conductor 54 is preferably welded directly, using conventional methods in a wave soldering machine (not shown), to the printed circuit board 18. It should be noted that other fastening methods, such as welding, resistance welding or direct plugging are possible. The solenoid assembly 10 further includes an overmolder of 56 to encapsulate the coil 46, the coil 40, the canister 48, and conductors 54. The overmold 56 is made of a relatively low (soft) orrometer material such as santoprene or silicone. Overmold 55 encapsulates coil 45 to act as a coil magnetic wire passage and as a binder to retain can 48 and coil / coil together. The overmold 56 extends through the opening 52 of the can 48 and between the lower web 50 of the can 48 and the base wall 30 of the housing 28 to act as a snap cap 58 to hold the can 46 in place. It should be noted that the overmould 56 can be fabricated by pressure molding with conventional molding equipment. It should be noted that the overmold 56 provides a resilient base or spring cap 58 between the can 48 and the housing 28.

It should also be noted that the overmold 56 passive to the magnetic wire of the coil d6. To assemble the solenoid assembly 18, the overmold 56 is molded in place to retain the solenoid 38 together to form the spring cap 58. The coil 40, the coil 46 and the can 48 are disposed between at least two fingers 3 and move towards the base wall 30. The winding 40 is fastened to the housing 28 by the spring and protrusion 45 and 35 respectively. The fingers 36 flex outwardly to allow the can 46 to be inserted therebetween and back inside to engage the can 46 and for the direction retention x and y. The spring and protrusion fastener 45 and 35 between the bobbin 40 and housing 28 provides retention of direction z. The soft brass connector 54 connects the solenoid 38 directly to the printed circuit board 18. It should be noted that the injection molding process eliminates the cost of an additional part of the associated assembly operation. It should also be noted that each solenoid 88 is fixed to the housing 28 and connected electrically to the printed circuit board 18. Referring to Figure 7, the lenoid assembly 10 is assembled to the electronic control unit 12. When the electronic control unit 12 is attached to the hydraulic control unit 14, the valve stem 24 is disposed in the passage 43 through the coil 40 and the spring cover 58 is slightly prime such as 0.8 mm. and acts as a member of spring to provide a spring force. The spring force provides intimate magnetic contact between the can 48 and the valve seat 22 on a scale of 4 to 54 newtons and maintains magnetic contact during the vibration of the vehicle and the impact rate of the vehicle. It should be noted that this connection is important for the operation of the solenoid 38 and specifically to maintain the magnetic flux path. The present invention has been described in an illustrative manner. It should be understood that the terminology that has been used is intended to be in the nature of words of decription rather than limitation. Many modifications and variations are possible in the present invention in light of the above teachings. Therefore, within the scope of the appended claims, the present invention may be practiced in a manner other than that specifically described.

Claims (15)

1. CLAIMS 1. - A solenoid assembly Will give an antisucking braking system, which compresses: a housing having a cavity; a plurality of solenoids, each of the solenoids being received within the cavity; and an overmold disposed between the housing and each u of the solenoids to provide an elastic force for one of the solenoids.
2. 2. A solenoid assembly as set forth in claim 1, wherein the overmold is made of a relatively low durometer material.
3. 3. A solenoid assembly as set forth in claim 1, wherein the overmold is made of santoprene if it is a solenoid assembly as set forth in claim 1, wherein each of the solenoids it comprises a bobbin, a winding wrapped around the bobbin and a bobbin to receive the bobbin and coil. 5. A solenoid assembly as set forth in claim 4, wherein the overmold encapsulates the coil, the coil and the canister. 6. A solenoid assembly as set forth in claim 1, which includes at least one driver who inter- necta each of the solenoids and an printed circuit board 7. - A solenoid assembly as set forth in claim 6, wherein the at least one conductor is made of a bronze material. 8. A solenoid assembly as set forth in claim 1, wherein the housing includes at least one day extending into the cavity to couple each of the solenoids. 9. A solenoid assembly as set forth in claim 1, wherein the housing has a base Dared and a plurality of fingers extending from the base wall toward the cavity, at least two of the fingers engage each one of the solenoids. 10. A solenoid assembly for an antisucking braking system, comprising: a housing having a cavity; a Solenoid Dlurality, each of the solenoids having a coil, coil and boat and being received from the cavity; and an overmold that encapsulates the coil, the coil-and the can and disposed between the housing and each solenoid to provide an elastretic force for each of the solenoids. 11. A solenoid assembly as set forth in claim 10, wherein the overmold is made of a material It lasted relatively low. 12. A solenoid assembly as set forth in claim 11, wherein the overmold is made of santoprene or if it is 1 icon. 13. A solenoid assembly as set forth in claim 10, which includes at least one conductor that interconnects each of the solenoids and a printed circuit board 14. - A solenoid assembly as set forth in claim 13, wherein the at least one conductor is made of a bronze material. 15. A solenoid assembly as set forth in claim 10, wherein the housing includes at least one finger that extends into the cavity to engage each of the solenoids. 15. A solenoid assembly as set forth in claim 10, wherein the housing has a base wall a plurality of fingers extending from the base wall toward the cavity, at least two of the fingers engage each of the solenoids. 17. A solenoid assembly for an anti-abutment braking system, comprising: a housing having a cavity and at least one finger extending into the cavity; a plurality of solenoids, each of the solenoids being received within the cavity and coupling when give us a finger; and an overmold disposed between the housing and each of the solenoids to provide an elastic force for each of the solenoids. 18. A solenoid assembly as set forth in claim 17, wherein each of the solenoids includes a spring clip and the housing includes a projection that extends through the spring clip. 19.- A solenoid assembly as stated in the vindication 19, wherein each of the solenoids comprises a coil, a winding wrapped around the coil and a canister for receiving the coil and winding and where the overmold encapsulates the coil, coil and boat. 20. A solenoid assembly as set forth in claim 17, which includes at least one brass conductor that interconnects each of the solenoids and printed circuit board.