Patent Application
20050045843
The present invention relates generally to vehicle actuators.
Actuators such as hydraulic valves used in vehicles in anti-lock braking systems (ABS), traction control systems, stability control systems, and other systems typically use electrically-controlled sliding plungers to selectively permit or prevent fluid flow through the actuator under particular circumstances, as required for the application. As recognized herein, to do this an actuator plunger may define a valve element that mates with a valve seat defined by a rigid plate. When the plunger slides to a closed configuration, the valve element of the plunger mates with the seat to block fluid flow through the seat.
The present invention understands that relatively precise alignment must be maintained between the plunger and valve seat, to ensure that the valve element mates properly with the seat. This typically requires the maintaining of relatively small tolerances, which increases manufacturing costs. As understood herein, it would be advantageous to absorb some misalignment between the plunger and valve seat and permit relaxed alignment tolerances.
An actuator includes a housing and a plunger slidably disposed in the housing and radially supported by a bushing. The plunger has a valve element on one end. A rigid valve seat member defines a valve seat configured for engaging the valve element when the plunger is moved to a closed configuration, wherein fluid flow through the valve seat is blocked by the valve element. As set forth further below, a resilient support element is disposed between the valve seat member and the housing to permit lateral motion of the valve seat member relative to a long axis of the plunger as the plunger moves to the closed configuration.
Preferably, the bushing contacts the valve seat member to substantially prevent motion of the valve seat member along the long axis of the plunger. The valve seat member can be sandwiched between the bushing and a portion of the housing, so that motion of the valve seat member along the axis of the plunger is prevented. To facilitate lateral motion of the valve seat member, the outer periphery of the valve seat member can be slightly spaced from the housing.
In another aspect, a control system for a vehicle includes a plunger slidably supported in a valve housing. A valve seat is configured for engaging the plunger in a closed configuration. The valve seat is permitted to move laterally with respect to the plunger as the plunger engages it, with fluid flow being permitted through the valve seat to components in the control system when the plunger is in an open configuration.
In still another aspect, a valve for a vehicle system includes a plunger, a housing slidably supporting the plunger for movement between an open configuration and a closed configuration, and a valve seat member in the housing. The valve seat member defines a valve seat that is blocked when the plunger is in the closed configuration and unblocked when the plunger is in the open configuration to permit fluid flow through the valve seat to the vehicle system. Means are provided for permitting lateral motion of the valve seat member relative to the plunger while laterally stabilizing the valve seat member.
The details of the present invention, both as to its structure and operation, can best be understood in reference to the accompanying drawings, in which like reference numerals refer to like parts, and in which:
Referring initially to
As shown in
As best shown in
While the particular VEHICLE ACTUATOR WITH VALVE SEAT CUSHIONED BY O-RING as herein shown and described in detail is fully capable of attaining the above-described objects of the invention, it is to be understood that it is the presently preferred embodiment of the present invention and is thus representative of the subject matter which is broadly contemplated by the present invention, that the scope of the present invention fully encompasses other embodiments which may become obvious to those skilled in the art, and that the scope of the present invention is accordingly to be limited by nothing other than the appended claims, in which reference to an element in the singular is not intended to mean “one and only one” unless explicitly so stated, but rather “one or more”. It is not necessary for a device or method to address each and every problem sought to be solved by the present invention, for it to be encompassed by the present claims. Furthermore, no element, component, or method step in the present disclosure is intended to be dedicated to the public regardless of whether the element, component, or method step is explicitly recited in the claims. No claim element herein is to be construed under the provisions of 35 U.S.C. 112, sixth paragraph, unless the element is expressly recited using the phrase “means for” or, in the case of a method claim, the element is recited as a “step” instead of an “act”. Absent express definitions herein, claim terms are to be given all ordinary and accustomed meanings that are not irreconcilable with the present specification and file history.
