Exhaust brake valve unit
OwnerVictor A. Harrisinventor
Life of this patent
Estimating the term…
Abstract
The invention provides an automatic exhaust brake valve unit having a hollow body with an exhaust gas passage extending therethrough and a valve closure member movable in the hollow body between a closed position in which it closes the passage, and an open position in which it leaves the passage clear, the hollow body having an open end face closed by a removable plate so that the valve closure member can be removed through that end face. Such a valve unit is usable to control exhaust gas flow in either direction through the exhaust gas passage when connected in an exhaust system of a motor vehicle.
Claims7
An automatic exhaust brake valve unit adapted to be connected into the exhaust system of a motor vehicle comprising a hollow body having an open end face and opposing planar walls defining a valve chamber therebetween which is open to said end face;
- said opposing walls each defining therein a port which in alignment with the port in the respective opposite wall defines an exhaust passage through the valve chamber;
- a valve closure member located within the valve chamber for sliding movement therein between said opposed planar walls and having opposed planar faces and a recess in each of said faces to leave a land thereon for sealing engagement with a respective one of said planar walls, the valve closure member being located in the valve chamber with a clearance fit therein and being movable in a direction transverse to the common axis of said ports between a closed position whereat exhaust gas pressure on either of said planar faces of the value closure member is operable to urge it against the one of said planar walls on the opposite side of the valve closure member to effect sealing engagement of said one planar wall and planar face and thereby close the respective port in said one planar wall, and an open position in which the exhaust passage defined by said ports is substantially unobstructed;
- an end plate arranged to be mounted across said open end face of said hollow body to close the valve chamber, said end plate defining therein an aperture;
- a fluid pressure operated piston and cylinder device mounted on said hollow body with the piston rod thereof extending through said aperture defined in said plate and being coupled with the valve closure member, the valve closure member defining therein an axial bore for receiving said piston rod with clearance and a cross bore through the axial bore, there being a pin mounted in the piston rod and extending through said cross bore with clearance whereby universal relative movement is allowed between said piston rod and said valve closure member;
- and securing means located externally of said cylinder device for securing said cylinder device to said open end face of said hollow body with said end plate located between said cylinder device and said open end face of said hollow body, said cylinder device, said end plate being removable from said hollow body upon releasing the securing means, whereby the cylinder device is removable from said valve body and the valve closure member is removable from said valve chamber through said open end face of said valve hollow body;
- and said exhaust brake valve unit further comprising scraping means disposed in a recess between said end plate and said piston and cylinder device for engagement with said piston rod, the scraping means comprising two rings having bores to closely receive the piston rod, and a coil compression spring disposed in said recess between said rings and around said piston rod to hold said rings respectively against said plate and said piston and cylinder device.
An exhaust brake valve unit for connection in an exhaust system of a motor vehicle to control the braking of the vehicle, said exhaust brake valve unit including a hollow body having opposed planar side walls defining a valve chamber therein open to an open end face across which is located an end plate closing the chamber, each of said opposed walls having an exhaust gas port therethrough aligned one with the other and through which exhaust gases are arranged to pass, a valve closure member having a clearance fit in said hollow body so as to be slidable therein under extreme heat conditions of the exhaust system, fluid pressure operable piston and cylinder means mounted on said hollow body having a piston rod coupled with said valve closure member for moving said closure member across said exhaust gas ports, said piston rod extending perpendicularly to the axis of the aligned ports through said open end face and end plate, securing means located externally of the fluid pressure operable piston and cylinder means for securing said piston and cylinder means to said hollow body so that upon removal of said securing means said valve closure member is removable through said open face as part of a one piece assembly comprising said closure member, said end plate and said piston and cylinder means without removal of said exhaust brake valve unit hollow body from said exhaust system and scraping means disposed in a recess between said end plate and said piston and cylinder device for engagement with said piston rod, the scraping means comprising two rings having bores to closely receive the piston rod, and a coil compression spring disposed in said recess between said rings and around said piston rod to hold said rings respectively against said plate and said piston and cylinder device.
Dependencies are inferred from the claim text.