AN ENTIRELY NEW HALLEY CHASSIS.
Page 14
Page 15
If you've noticed an error in this article please click here to report it so we can fix it.
For Loads of from 30-40 Cwt. or 14-25 Passengers. Four Speeds Forward ; Overhead Worm Drive and Pneumatic or Solid Tyres to Choice,
F' SOME time, the builders of the now famous six-cylinder P type chassis have felt the necessity for providing amongst their models one which will meet the needs of that large class of user who wishes to deal with loads not exceeding two tans, or to fit a passengercarrying body which will seat comfortably from 14 to 25 persons. As a result, they have on show, at the Kelvin Hall, Glasgow, a very neat open coach, which should make a strong appeal to a large section of the buying public.
The new chassis has a body space of 11 ft. 9 ins., a wheelbase of 12 ft., and a track of 4 ft. 10 ins. ; it can be equipped with pneumatic tyres, 895 mm. by 135 ram., single at front and twin at rear, mounted on pressed steel wbe.els, or, as an alternative, solids for ilk mm. for 720 mm. on cast steel wheels.
• The power unit is a four-cylindered monobloc of 95 ram. bore and 140 mm. stroke, capable of developing a continuous kiorse-power of 25 at 1,000 r.p.m. The valves, which am all at one side, are of large diameter, and interchangeable, and are .enclosed by dust-proof covers, easily detachable for inspection or adjustment of the tappets. Ample strength is given to the crankcase by the
• stout bearer arms, which are carried on hangers fixed directly to the main frame, and arranged so that the bottom half can be dropped without interfering with the crankshaft. The bottom half of the crankcase forms a capacious sump, in which is embodied the oil well. for the pump. A gauge filter is provided between the main ail sump add the pump well, and this excludes all foreign matter from tho pump. The
hitter is gear-driven direct from the camshaft, and delivera oil under pressure through a separate external strainer, easily removable for cleaning, to the main bearings and big-ends, from which it returns to the main sump. A relief
valve ensures that the oil is kept at a constant pressure of 7 lb. per sq. in., and al) oil pressure indicator is fitted on the dash. The sump holds kbout three gallons of oil, and has ailoat type indicator.
From the engine the drive is taken through a single-plate clutch, of the dry 'type, consisting of a steel disc between two fabric rings; the device is very sweet in action, and is easily adjustable externally in the event . of wear occurring. Gear changing is facilitated by a well
designed clutch brake. •
Four speeds forward and a reverse are given by the gearbox, the actual forward .ratios being 17i, 9, 4, and 34 to 1. Tile gears are of the sliding clash-engage. ment type, and both they and the shafts are of best _quality, high-tensile steel, suitably heat treated. The gearshaits run in taper and adjustable roller bearings, and as they are short and of largo section,_ any tendency to whip is obviated. A neat feature is the completely enclosed speedometer drive.
A apecial form of ring type universal joint, embodying a star piece and hardened steel dies, is utilized between clutch and gearbox, and for the propeller shaft ; these, joints are neat an!„.1 light, but present ample bearing surface. A special welded steel casing of the pot type is employed for the rear axle,: the worm and worm wheel—which are carried between taper roller bearings— being carried independently by the top cover of the casing, thereby facilitating removal or inspection. The spline driving shafts, also made of high-tensile steel, are supported by adjustable taper roller bearings of ample size. Following the trend of modern ideas, the "driving torque is taken directly by the rear springs, which aro designed accordingly.
As regards the, brakes, both hand and foot type have internal-expanding and concentric shoes, acting direct on steel drums of large diameter, bolted to the. rear wheels ; these brakes are very powerful, and present the advantage that the transmission gear is relieved of all stress.
We have already alluded to the road wheels; these, whether of pressed or cast steel type, are mounted on taper and adjustable roller bearings. Little, need be written about the front axle, which is of the standard stamped type, with the stub axles orried by deep jaws. The steering gear 'embodies a . steel worm and complete worm wheel, whilst the connections are fitted with ball and fork type joints with ample bearing surfaces. One of the most important features of the chassis lies in the frame. This is of the usual pressed steel type, but has exceptdonally deep side-members in order to prevent any tendency to whip, which is a very bad trait disclosed in many vehicles, and one which is a. great disadvantage. when the chassis is employed with passenger-carrying bodies.
Thernio-syphonie circulation of the cooling water is adopted in conjunction with pipes of large diameter, and a tabular type radiator, with a great cooling area and detachable header and bottom tank. Cooling is assisted by a threebladed fan, driven by a V belt, and situated in a tunnel; the fan runs on ball bearings, and has an eccentric adjustment for the belt. Ignition is by h.-t, rnagnet.o with spark control. The engine is extremely flexible, and can be controlled to run at any speed between 200 and 1,6(}0 r.p.m-' but, normally, it is governed to 1,200 r.p.m. by a device which operates directly on the throttle valve.
When pneumatic tyres are fitted to the chassis a mechanical tyre pump, driven directly fromthe gearbox, is provided for their inflation. This pump is operated by a sliding pinion controlled by a lever conveniently situated at the side of the chassis. The lubrication of the air pump is effected by the grease in the gearbox, and the,system is quite automatic.
Gravity feed is employed for the fuel, which is contained in a 15-gallon tank under the driver's seat: A most comprehensive guarantee covering one year will be given with each chassis.