Free wheel hub
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The free wheel hub (free wheeling hubs) is kind of the wheel hub used for a car and comprises the system which can separate the driving force from a drive shaft for the option of the driver. I am used for a part-time-type 4WD car and may be called a rocking hub (Locking hubs) mainly.
Table of contents
Summary
By much part-time-type 4WD cars particularly cross-country 4WD or the 4x4 truck of the heavy-duty type, I comprise transfer [1] to the propeller shaft to tie an anteroposterior axle to, and, as a general rule, the strong driving force such as hill-climbing or a bad road becomes often applied as a two-wheel drive at the time of the everyday run in most cases because it is said that a four-wheel drive and a thing doing are desirable only for situation to be required.
The wheel of the axle which is not a driving wheel is used for the free wheel hub in the two-wheel drive of such a vehicle by a drive shaft to separate it. A wheel and the drive transmission between the drive shaft are quitted when I operate a free wheel hub, and driving force does not reach the wheel even if I changed it to a four-wheel drive with operating.
The backgrounds where such a mechanism was devised include a big thing so as not to be able to ignore turn resistance by the skidding of a drive shaft, the differential that linked non-driving wheel and that of in the two-wheel drive part time 四駆車両 and the propeller shaft. As for this rotary resistance, as for the implementation of the free wheel hub, there was big significance to be connected directly with increase of aggravation and the vibration of the same mileage, the weight of the steering at the time of the turning in giving part-time 四駆車両 driveability and the mileage performance like the two-wheel drive vehicle.
The free wheel hub greatly separates you and can classify it in two kinds now.
One is a free wheel hub of the hand operation that is used a lot for an old four-wheel drive car, and the hub tip is accompanied by a knob, and it is necessary that the driver goes down the car for the operation of a direct connection, the liberation of the hub each time and operates it. Because the change of the hub is possible, it is said that it is desirable to run with making a hub a direct connection state beforehand when I run in the long bad road section even if it is the state of the two-wheel drive regardless of a drive state of the transfer. In addition, I can create the states called "the low speed range of the two-wheel drive" intentionally by freeing a free wheel hub after verge transfer making low-speed ranges such as 2H-4H-4L in a car model comprising a vice-gearbox in the transfer changed it to 4L with the thing having a shift pattern becoming 四駆 forcibly. Therefore structure is simpler than a later automation-free wheel hub, and light weight, the drive form that is superior in reliability and the combinatorial flexibility of the vice-gearbox gear range are high, and, in the person who assumes a bad road run a hobby, the person changing an automation-free wheel hub in hand operation daringly exists. However, there is possibility [2] that the third party except the driver changes it with malice because a hub change knob does not have keys in particular.
It is an automatic free wheel hub used for the most of the recent four-wheel drive car one more. A transfer change perform it the direct connection of the hub with the transfer change operation of the driver easily automatically to free you even if running, and, as for this type of hub, there is an advantage that the mileage aggravation by the change lapse of memory of the free wheel hub does not occur even in a two-wheel drive by minus number pressure and oil pressure, electric motor drive.
However, it is said that there is the fault that the situation that cannot escape from stack is possible without an automatic hub operating to change the hub after putting constant sky race distance (in many cases the progress side) not a direct connection freeing a hub after a transfer change as for most of hubs of this form instantly even if four-wheel-drive change it at the time of situation that I have completely stacked in a two-wheel drive state. Therefore four-wheel-drive, it is necessary to change it early when I pass a point at risk for the stack after having judged a road surface state beforehand when I run in the bad road.
Demerits on implementing a free wheel hub include that there is the risk that change in itself cannot perform at the time of situation that sky race distance is not produced in the case of a thing, the automation that getting on and off is necessary for at every operation in the case of hand operation according to the said article, but include the possibility that the hub body is damaged because an obstacle hits the hub tip at what is limited to some extent, the bad road run, and a design and the kind of the wheel which I can attach from the existence of the huge hub tsukidashi part as well as it cannot run and fall into it.
Free axle
The mechanism called the free axle (Free Axle) may be used for the purpose of being similar to a conventional free wheel hub by 4WD car that recent automation advanced. The free axle is established near a non-drive shaft side demister case whereas it quits a hub and the drive transmission between the drive shaft, and it features the free wheel hub to cut off the drive transmission between demister and the drive shaft. I am used in the form of an automation-free axle to work with vacuum diamond Fulham or an electric motor in most cases by the implementation form.
Because the free axle can concentrate mechanism on a demister case of the neighborhood of body center, it is simple and more lightweight in a hub thing of the wheel, and there is the advantage that it is possible for. On the other hand, it becomes slightly than a free wheel hub disadvantageous with the aspect called the reduction of the drive loss because a drive shaft has been connected to a hub mechanically.
It is classified roughly by a thing separating only a drive shaft of right and left either one that I separate the drive shaft of right and left both sides of the non-drive shaft side demister case to a free axle. The latter structure got a fault of so-called opening demister underhand and creates the states that a ring cut in half of the differential gearing completely becomes no load artificially. Thus, the pinion gear on the drive shaft side separated by a free axle continues racing at high speed with the turn of the propeller shaft, and the turn of the propeller shaft does not reach the drive shaft of the side connected adversely, and the back torque from a wheel does not reach the propeller shaft at the same time, too. As for the latter structure, simpler in a free axle; and can come true reasonably, but on the other hand there is the fault limited to opening demister the differential gearing which can incorporate to a non-drive shaft side demister case.
Footnote
- In the case of ^ full-time 4WD, it is center demister. I may be substituted by viscous coupling.
- When only ^ particularly a ring cut in half is assumed a drive or non-drive state, I may be connected by the vehicle which comprises LSD to the non-drive shaft in inviting unnecessary abrasion and damage of the LSD because a ring cut in half continues racing.
Allied item
This article is taken from the Japanese Wikipedia Free wheel hub
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