1925-12-12 — Page 10

THE HONGKONG TELEGRAPH.

B. S. A. MOTOR CYCLES

Famous For Reliability and Economy

Full Particulars from the Sole Agents:

THE SINCERE CO.

Maximum Cushioning in

Goodyear Tyres for Trucks

Goodyear Trucks are costly and should be protected. Heavy Duty Cushions have maximum cushioning, pro- tecting both the driver and Truck as well as the load.

The wide, thick All-Weather Tread and sidewall indenta. tions give a resiliency which is remarkable in a tyre design- ed for heavy duty service.

The smaller and more numerous froad blocks provide road contact and tractive power of ovident advantage in any work.

The three essentials-Traction, Durability hand. Cushioning are combined in Goodyear Heavy Duty Cushion Tyres, assuring economy in heavy service hauling.

Next Time Buy

GOOD YEAR

CUSHIC TYRES

DISTRIBUTORS.

ALEX. ROSS & CO., (CHINA) LTD.

Bank of China "uilding Hongkong.

Built up to a STANDARD and down to a price the

AL

·AUSTİN SEVEN'

508 so little gasoline, it almost runs on ite reputation.

Stocks carried.

Alex. Ross & Co., (China) Ltd.

Show Room No. 1A, CHATER ROAD,

PROMOS IŠSITENASIA THIRDAYS AFTERNOON till 5 o'clock.

MOTORING

PPLEMENT.

SATURDAY, DECEMBER 12, 1925.

THE PLAIN MAN AND HIS CAB.

V. RUNNING GEAR. (Concluded) (By P. W. F. Mills.)

There are two possible arrange-Jopposite. Thus when the blades ments of the rear axle assembly. of an electric fan revolve the pres In either arrangement the drive sure which they exert on the air to each road wheel must be is opposed by an equal pressure separate, the connection between which the air may be said to exert the drive to each wheel and the on the blades. In the case of a remainder of the transmission fan or similar machine the name being mude through the differen- given to this equal and opposing tial.

Again, the spring pads, reactionary force is "resistance." brake shoes and brake operating If the fan 'be suspended from a lovers must be attached to non-celling by a tube the reactionary force tends to twist the fan in its rotating portions of the axle.

Similarly, if a nut be arranged.

The difference between the two ceiling socket in a direction op- arrangements lies in whether the posite to that in which the blades road wheels are mounted on rotat-jare revolving. This twisting ten- ing shafts supported in the non-dency is met by the socket sup- rotating axle casing or whether porting screws, and if these aro they run on bearings formed on properly designed and fitted no the extremities of the casting and movement actually takes place. are driven through some type of driving joint from separate shafts which run from the differential to rotate on a bolt and the nut is held between guides in such a inside the casing.

The latter arrangement is more way that it cannot move endways the smallest distance expensive in manufacture, but it or even has the great advantage of in-rotation of the nut will cause end- posing the stresses of supporting ways movement of the bolt, and the car on the axle casing instead this arrangement is found in a of on the driving shafts from number of mechanical devices. differential to road wheels. The What actually forces the bolt to driving shafts are required only move is the fact that the threads to drive the wheels, not to support of both nut and bolt are relatively them. In the former arrangement moving inclined planes, and the both driving and supporting loads force thus applied by the nut to are borne by the driving shafts, the bolt must be accompanied by When the first arrangement is em- a reactionary force which tends ployed the driving shafts are to force the nut itself endways usually termed "live axles" to dis-out of position, the bolt remain- tinguish them from the axle casing stationary. This is why in a ing, which is in this case the axie device of the sort guides to main- proper in as much as it is upon tain the endways position of the the casing that the road wheels nut are necessary. are carried.

"shoes"

friction covered with

To consider first, the case of a car employing "worm and worm- The Brakes,

wheel" drive in the rear axle is is Until quite recently it was unclear that there are some points in uscal to find brakes operating on common between this type of drive' drums attached to the front and the nut and bolt devices just wheels, but from the earliest days dealt with. Rotation of the worm of car manufacture it has been tends to rotate the worm-wheel, the practice to fit drams to the but the reactionary force, ever rear wheels.

These drums are present, tends to result in the rigidly attached to the wheels in worm screwing itself endways teeth of the the some way, and inside them He over

latter re- wheel, the worm

There is fabric and curved to fit the in- maining unmoved. ternal diameter of the drums. The accordingly a heavy end strain shoes are normally held clear of in the shaft upon which the worm the drum surfaces by strongis mounted, and this must be met springs, but movement of a cum by the provision of strong thrust operated by the brake control bearings at some point in the causes them to press against the transmission line. It is obviously drums and impuse a heavy frie desirable to arrange for this tional load on the rotating wheels-thrust to be taken in such a man- One brake control, either hand orner that the more delicate parts pedal, usually serves to operate of the transmission are entirely the brakes on both wheels, and in relieved of strain from this source, this case 'the two cam lovers are

especially as the strain is revers- ed in direction when the brakes connected by a "compensating" lever which ensures even pressure are applied or when reverse gear on both brake shoes. The pres

is in engagement. sure is evenly distributed over both sets of shoes although owing i

In the ease of a "final drive" of bevel" type the

to faulty adjustment, one set of the "bevel to shoes makes contact with its drum forces at work are not quite the Whenever two toothed same. earlier than the other set.

"Four-wheel braking," which wheels are in engagement, the ont lias become the "talking peint" of driving the other, the two forces so many car manufacturers, may are present. The principal force be said to have originated many is that which tends to cause the years ago in England, but for teeth of the driving wheel, as reasons connected with the difli- they rotate, to force the teeth off culty of arranging a suitable con- the driven wheel in a tangential trol to wheels used for steering direction, ie. to force the driven Its wheel to rutate also, in the op- the practice fell into disuse.

dates from justposite direction. The reactionary recent revival after the War, when a number of force tends to cause the feeth of Continental cars appeared with the driving wheel to "run over" four-wheel brakes. Since that those of the driven wheel, the lat- In the time four-wheel braking has made ter remaining unmoved.

toothed wheels an immense strides, and although the case of two most successful designs continue found in any mechanical device to be based on compressed air or the tendency of the reactionary hydraulic control a number of force is met by the fixed positione four-wheel brake systems on the imposed on the axes of both market are controlled by rods con-wheels. If the wheels referred to taining universal joints or Bow-were of bevel type the primary deu cables. Front wheel brakes and reactionary forces would act differ very slightly from rear in just the same way, and in the wheel brakes except in the method case of a final drive of this type of control. being usually of the on a car there is an always present ordinary drum and shoe pattern. tendency for. the propeller shaft, The transmission affords rotat-which carries one of the bevel ing members upon which it is con-wheels, to alter its alignment venient to arrange a drum and relative to the centre of the rear shoebrake, or, perhaps even more axle. conveniently, a brake of the drum

The name "torque reaction" is and "slipper" type: In the latter type of brake two members lined given to the reactionary force,! with friction fabric are contracted but the tube or stays which meet jon to the external surface of the this force are usually termed drum. A brake situated any-simply "torque tubes" or "Lorque" where in the transmission line, has stays."

HUDSON COACH

$3000

The Essex Coach

The Essex Touring

$000

.$000

The Hudson Touring ....$000

The Hudson Brougham: 1000

The Hudson Sedan

1000

Only Hudson Can BuildIt

Being the world's largest bilders of 6-cylinder cars permits Hudson to give the greatest price advantage, with the finest quality in Hudson history.

Everywhere it is called "the

World's Greatest Buy" be- cause it is universally ack- nowledged that no car gives. like quality, reliability, per- formance and fine appear-

hundreds of Ance within dollars of its price.

Hudson-Essex World's Largest Selling 6-Cylinder es

THE DRAGON MOTOR CAR CO., L).

Telephone Central 1246 or 1247.

33, WONG NEI CHUNG ROAD.

JEJE

T

In Detroit,

for instance-

Studebaker Big Six Duplex-Phactor

HAPPY VALİ

Studebaker Dependability is Strikingly Recognized

TN Detroit, 130 Studebaker cars (not busses) are engaged in regular hire or livery service. And each has traveled more than 100,000 miles!

Detroit, the greatest automobile manufactur ing city in the world, demands the highest values,in motor cars. It is nignificent there- fore that 90 per cent of the livery cars in Detroit running, over established routes, are Studebakers,

Of all American-made cars only two-Ford in the low priced and Studebaker in the fine car field, are manufactured on a "one-profit"

Studebaker

basis. Only these two manufacturere ke all their own engines, bodies, clutchegif- ferentials, steering gears, gear boxes, spra, axles, gray iron castings and drop forgis. To do this insures better cars at lær, prices.

Profits which other manufacturers ret pay to outside parts and body makerste eliminated in Studebaker cars. The saves effected enable Studebaker to use ber materials and better workmanship witht charging higher prices.

STUDEBAKER, South Bend, Ind., U.

THE HONGKONG HOTEL GARAGE.

(THE Hoyakosa & Supar HOTELA, LTD.) Sales Phone C475", Service Phone C4602

STUDEBAKER

BUILDER

compression stresses are transfer- red to it from the shaft.

The

the advantage of imposing a In a chassis with "worm and tube is rigidly attached to the heavier frictional load, surface worn-wheel" final drive torque rear axle casing at one end, and for surface, than brakes on the reaction has the effect of imposing its forward end swings in a The end thrust on the propeller shaft: trunnion bearing carried in a Toad wheels themselves.

member running friction between two rubbing sur in "bevel to bevel" drive the heavy cross faces increases with the speed of effect is to impose a vertical across the frame. It can thus the surfaces, and owing to the strain on the shaft, accompanied, pivot radially to allow for motion pormanent reduction gear in the in actual practice, by a small end of the rear axle casing under road rear axle drive the transmission thrust as well. shafts always rotato faster than the road wheels.

ahocks. A torque tube of almost similar construction is equally The heavy and thrust in the effective in meeting. torque re- former case is met by enclosing action in bevel drive, as the tube the propeller shaft in a massive

is capable of bearing stresses It is a law of mechanics that torque tube containing thrust from more than one direction. action and reaction are equal and hearings by which the tension and

""Torque Reaction."

TY VEHICLES POR 7:3

TE

SOCONY

R

MOTOR OILS.

AND

GASOLINE

Page 10Page 11