DE1966075U - SHIFT FORK. - Google Patents

Description

Shift fork

The hiring relates to a shift fork for change gears of, for example, motor vehicles. - ■ .. -.

Such holding forks have the task of. Switching of the gear steps of change gears - to transmit the power - to the rotating shift sleeves- .. i ^:

Due to the equalization of the speed as a result of the engagement of the shift fork in the muffle, in particular in the case of fully synchronized transmissions, high forces, preferably frictional forces, occur. They cause premature wear, especially that in the guide groove of the holding muffle. engaging ends of the shift fork. It is therefore necessary to design the shift fork in such a way that it _: Withstands these high demands. . . \. . . :

It is known to use shift forks to meet this requirement Made of forged steel: the sliding surfaces for intervening in the surface of the muffle

to harden. . : -``.-: -_ -

It is also "known S ehalt forks from solchen.Metallen or alloys z J. To manufacture cast bronze _s having good sliding properties, so .that additional surface treatment of the sliding surfaces accounts

For surface hardening of Gleltflächen to shift forks, however, a heat treatment is required which, because the temperature and the heating time exactly - _s do not have to be complied with only cumbersome but also expensive-by the high energy requirements. "

One-piece gearshift forks, ζ.-B-. made of bearing metals the advantage that an additional surface hardening is not necessary «These shift forks could, but the do not γοΐΐ meet the high expectations placed on them. They require careful manufacture and the cost are relatively high «■"... " _ - -; --- ■ "" -.._

It has also already been proposed to use one-piece shift forks, or in the case of multi-part shift forks, at least the cast iron cell engaged with the muffle, to produce the free carbon in spherical 3? orm is included. This embodiment means one port step to the acquaintance »It turned out, however, that the sliding surfaces of the Sehalt, gäbel ·, - di | ig you guide groove of the Shift muffle intervene, but not the long service life

which is desired in practice »

It has been finally tried to coat the exposed places by injection layers, "From ζ J. Hartmetallrerbindungen This type of coating is ^ due to the high fuel consumption too ^{expensive"...:.}

The! Inflation "is based on service life-creating _s a shift fork for gearboxes of high task.

This task is solved by to the. Ends of the switching force or *. Surfaces of the. Shift fork, arranged rectangular plates, made of a hard metal alloy «" - ~ '~ _- _ -..-

The figure shows the furnace <,. ._.- ■ "

1. denotes the shift fork, 2. the bearing used to accommodate a shaft, 3 », which are attached according to the hay Carbide plate ». · - ■ - ■ ..-.

The benefits achieved with the tax exist in particular in that regardless of the one used for manufacture Material, one. Shift fork is made available, the is characterized by its extremely long usage time.

The hard metal plates attached to the force-transmitting surfaces at the ends of the shift fork are highly wear-resistant and hardly wear out even after a long period of time. The plates made of hard metal alloy, in particular made of a _:. alloy with the components of chromium, "icfcel and" boron are on the surface e inf manner to that coming in the operation of the switching muffle in contact end faces. Shift fork can be "attached" by soldering, for example ...

laughing at the innovation, the carbide plates are so on the ends of the shift fork soldered on,.; Äaß them. to the inside protrude by a few millimeters. This has the advantage that when the Sehaltgabel is at rest position, the. Inner surfaces 4 no longer rest on the gearbox shaft and are therefore subject to wear and tear, but the protruding edges of the platelets as a support serve and protect the surfaces 4. .- ■ - "■■

Claims (1)

Frankfurt (Main), March 30, 1967 prov. Ir-, 5241 S ohut ζ claim ο) Shift fork for gearbox marked by at the ends of the switch aft. i by division Sling movement across load-bearing surfaces arranged rectangular Plate (3) made of a hard metal alloy. 2 ") Shift fork for change gear, characterized in ', that the platelets. (3) a few millimeters above the Planes (4) of the Sehaltgabel are arranged protruding.