Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1992-09-04
1994-07-05
Graham, Matthew C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
174 65R, 174 65G, 361776, B60T 836, H02G 308
Patent
active
053261615
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to an elastomeric seating member and an assembly incorporating the same, particularly though not exclusively for solenoid coils of antilock brake system controllers (ABS).
BACKGROUND ART
In ABS systems, it is known to connect the solenoid coils of the solenoid valves to electronic control circuitry remote from the coils by way of a conductive card (2), as shown in FIG. 1. The electronic control circuitry (not shown) is not located in the housing (4) since the circuitry can be damaged by the ambient conditions such as temperature, vibration and moisture.
The conductive card (2) is mounted in a housing (4), which also contains an array of electric solenoids (8) (only one of which is shown). Housing (4) is mounted on a valve block (10) which is of ferromagnetic material and which conducts the magnetic flux developed by solenoid coils (8). The valve block (10) comprises a plurality of domes (11) (only one of which is shown) containing mechanical switch parts (12) of the solenoid valves. Each coil (8) is annular and surrounds a respective one of the domes (11). It is important that the coil (8) is aligned accurately with respect to the dome (11) in order to obtain optimum magnetic flux. The solenoid coil (8) is coupled to conductive card (2) through holes (3) in the conductive card (2) via two stiff wire leads (14). Thus, it is important that the wire leads (14) are accurately aligned with the holes (3). Such a need for accurate alignment increases the difficulty of attaching the solenoids via the leads (14) to the conductive card (2) and increases the production costs. Furthermore, it is necessary to accurately align the solenoids (8) relative to the switch parts in blocks (10) which also increases the production costs.
To assemble this arrangement, electrical connections must be made between the control circuitry (not shown) and the conductive card (2) and between the conductive card and the solenoid coils (8)
This arrangement suffers from a number of additional disadvantages and problems due to the necessitated separation of the control circuitry and solenoid valves. For instance, a significant amount of space is required for the solenoid valves and the control circuitry, additional electrical connections must be made during assembly, the conductive card and the leads (14) can be damaged during assembly, and the conductive card may be subject to corrosion particular since the connection of the housing (4) to the valve block (10) does not provide a sufficient seal to protect the card (2) from ambient conditions.
SUMMARY OF THE INVENTION
It is a principal object of the invention to overcome the above mentioned problem of accuracy in alignment.
The present invention provides an assembly comprising first and second housings, the first housing containing an array of first members mounted therein, said first members having respective wires extending therefrom for coupling said first members to electronic means within the second housing, an elastomeric seating member mounted within a bore communicating between the first and second housings in order to provide a seat for the first member and to permit the first member a small amount of movement, the respective wire extending through the seating member.
An advantage of the present invention is that the elastomeric seating member permits movement of the first member in order to provide larger dimensional tolerances on assembly. Thus, accuracy constraints on the system are relaxed and the assembly is constructed as separate first and second housings containing respective parts.
In a further aspect the invention provides a seating member for fixing in a bore in a housing to serve as a seating for a member to be mounted within the housing having a wire extending therefrom, the seating member being formed of elastomeric material and having a central bore to permit the wire to extend therethrough, the elastomeric seating member having a lower cylindrical portion, an intermediate portion providing a shoulder and an upper
REFERENCES:
patent: 2225472 (1940-12-01), Franklin
patent: 4145566 (1979-03-01), Wengartner
patent: 5022717 (1991-06-01), Heibel et al.
patent: 5037318 (1991-08-01), Robertson
patent: 5040853 (1991-08-01), Burgborf et al.
patent: 5141298 (1992-08-01), Von Hayn et al.
Adams Graham L.
Trach Guenter
Graham Matthew C.
Melamed Phillip H.
Motorola Inc.
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