Patent GB-254655-A (GB)
Title: Improvements in and relating to central lubricating systems
IPC: F16N21/00
Filed: 1926-03-29
Abstract: 254,655. Bijur, J. March 29, 1926. Channels in steering-apparatus and brake mechanism. - A lubricating-device for the bearings associated with the knuckle 12 of a motorvehicle comprises a pipe 33, Fig. 1, extending along the axle 11 and conveying lubricant under pressure, the pipe discharging, through a pressure-absorbing fitting P such as that described in Specification 237,958, [Class 12 (iii), Lubricators &c.and through passages 42, 43 in a cap 34 covering the upper end of the knuckle, into the interior of the knuckle, whence it flows to the various bearings by gravity through a system of passages and pipes, such system being unvented and the parts of the system lying above the bearings having cross-sections sufficiently large to permit flow of lubricant without air blocking and to prevent syphoning. Part of the lubricant fed through the passage 43 flows through holes 44 and an axial bore 45 in the king pin 10 to the lower knuckle bearing 26, while the remainder passes through the upper roller bearing 17 into a trough 18<1>, whence it drains through a pipe 54 into a tube 55, Fig. 3, within a flowdividing fitting 47. Inturned lips 57 on the tube 55 divert a part of the lubricant flowing through the tube into a pipe 52 leading to the tie-rod bearing 29, the remainder flowing through a pipe 49 to the drag-link bearing 32. The pipe 49, which lies wholly below the lubricant outlet in the bearing 32 and acts as a lubricant trap, may be of small bore. In a modification, lubricant is conveyed to the knuckle from the chassis frame through a conduit embodied in a brake-operating rock shaft, as described in Specification 235,087, a pressure-absorbing fitting being arranged at the inlet to the conduit. In this embodiment, the whole of the lubricant passes through the roller bearing 1'7, a part being then diverted by an intercepting ring fitted on the pin 10 into the bore 45, while the remainder drains into the trough 18<1>, with which the pipes 49, 52 have independent communication. In a further modification shown in Fig. 6, the supply pipe 33 and fitting P discharge through a passage 81 in the axle into an annular space 79<1> surrounding the middle of the king pin, whence the lubricant flows through a radial hole 84 to an annular space surrounding a tube 86 fitted in a bore 85 in the pin and having a slotted end 87 protruding above the top of the pin. Part of the lubricant overflows into the tube 86, whence it passes to an annular groove 89 in the lower bearing, and part overflows through the upper bearing 17 to the trough 18<1>, whence it is distributed to the tierod and drag-link bearings. Lubricant draining from the lower bearing into a well 93 passes into a groove 95 in a brake cam 90, whence it passes through a hole 95<1> to the key 91. In the form shown in Fig. 9, the supply pipe 33 is provided with two fittings P in parallel, delivering through passages 103, 104 in the axle to separate annular spaces 106, 107 around the king pin. From space 106, lubricant passes through a bole 108 into a bore 109 in the pin, the overflow from which passes through the roller bearing to a pipe 49 leading to the drag-link bearing. From the space 107, lubricant passes through a radial hole into a bore 110 in the pin leading to the lower bearing. Lubricant accumulating in the bore 110 overflows into a tube 112 delivering to the brake structure 111 and also flows through a pipe 114 to the tierod bearing.