Portal box

Abstract

A kit for raising and increasing wheel torque of an off road four wheel vehicle comprising four portal boxes, each portal box being associated with an individual one of the vehicle wheels, the portal boxes enclosing identical gear sets and associated bearings, each portal box being adapted to receive the output of an axle constant velocity joint and having an output shaft projecting therefrom, a set of four metal backing plates for joining the portal boxes to the suspension arms of the vehicle, the backing plates being substantially identical, the backing plates each having inwardly extending mounting brackets for attaching to upper and lower suspension arm parts.

What is claimed is: 
     
         1 . A portal box assembly for mounting a wheel of an off road vehicle comprising a steel backing plate and a portal box, the backing plate being formed of a flat plate and provided with a flat mounting surface and a pair of vertically spaced mounting brackets extending away from the mounting surface, the brackets including holes for connection with the suspension of a vehicle, the portal box and backing plate having aligned holes for receiving bolts for mounting the portal box to the backing plate, the portal box containing input, idler and output gears, the portal box having an operational orientation in which the output gear is below the input gear, the mounting brackets being separately formed prior to mounting onto the backing plate. 
     
     
         2 . A portal box assembly as set forth in  claim 1 , wherein the portal box includes a case that abuts the backing plate and provides a cavity for receiving said gears. 
     
     
         3 . A portal box assembly as set forth in  claim 1 , including a cover plate, the cover plate being arranged to hold bearings for rotational support of said gears. 
     
     
         4 . A portal box assembly as set forth in  claim 3 , wherein said cover plate includes provisions for receiving a brake caliper bracket. 
     
     
         5 . A portal box assembly as set forth in  claim 3 , wherein said case and cover plate have mating planar faces parallel to said backing plate. 
     
     
         6 . A portal box assembly as set forth in  claim 5 , wherein said case is machined from an aluminum block. 
     
     
         7 . A portal box assembly as set forth in  claim 6 , wherein said block is a rectangular parallelepiped. 
     
     
         8 . A portal box assembly as set forth in  claim 1 , wherein the mounting brackets are welded on the backing plate at locations determined by a vehicle on which the portal box is installed. 
     
     
         9 . A portal box assembly as set forth in  claim 1 , wherein said backing plate has a clearance hole for an output spline of a CV joint. 
     
     
         10 . A portal box assembly as set forth in  claim 9 , wherein the clearance hole lies within an imaginary boundary defined by said aligned holes and said backing plate. 
     
     
         11 . A portal box assembly as set forth in  claim 3 , wherein said case includes recesses carrying bearings for supporting said gears. 
     
     
         12 . A portal box assembly as set forth in  claim 1 , wherein said input gear has an internal spline for receiving an external spline of a CV joint of a vehicle axle. 
     
     
         13 . A kit for raising and increasing wheel torque of an off road four wheel vehicle comprising four portal boxes, each portal box being associated with an individual one of the vehicle wheels, the portal boxes enclosing identical gear sets and associated bearings, each portal box being adapted to receive the output of an axle constant velocity joint and having an output shaft projecting therefrom, a set of four metal backing plates for joining the portal boxes to the suspension arms of the vehicle, the backing plates being substantially identical, the backing plates each having inwardly extending mounting brackets for attaching to upper and lower suspension arm parts. 
     
     
         14 . A kit as set forth in  claim 13 , wherein the mounting brackets of one side of the vehicle are mirror images of the mounting brackets of the other side of the vehicle. 
     
     
         15 . A kit as set forth in  claim 13 , wherein said mounting brackets are welded on said backing plates. 
     
     
         16 . A kit as set forth in  claim 13 , wherein said portal boxes and backing plates have alignable bolt holes for receiving bolts that hold the portal boxes on the mounting plates. 
     
     
         17 . A kit as set forth in  claim 16 , wherein said portal boxes include a hollow case and a cover plate, common bolts holding said cover on said case and said portal box to said backing plate. 
     
     
         18 . A kit as set forth in  claim 13 , wherein said portal boxes and backing plates have similar profiles with edges aligning with an imaginary rectangle.