DE2336337A1 - HYDRAULICALLY SUPPORTED MECHANICAL PRESSURE CONTROLLER FOR CONTINUOUSLY ADJUSTABLE ROLLING GEAR - Google Patents

Description

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Neuweg Manufacturing Company with limited liability for precision engineering

7932 Munderkingen

assisted mechanical contact pressure regulator for continuously adjustable rolling gears

The invention relates to a hydrostatically assisted mechanical Contact pressure regulator for continuously adjustable rolling gears with four concentrically arranged races that form an annular space in which the rolling elements run and in which the speed is continuously changed by axially moving one or more races will. The contact pressure required for power transmission is generated by a combined contact force regulator, a small part of the contact pressure by a mechanical energy storage means, a further part hydrostatically by means pressurized hydraulic piston and most of the torque dependent by means of a mechanical device in a known manner brings up.

It is known that it is very difficult, purely mechanically, to obtain the required contact force for the various running conditions to create. If too little is generated, there is undesired slip and, as a result, a drop in speed, too much is generated this has a very detrimental effect on the service life of such transmissions. It can be assumed that in gearboxes with more than 2 kW power, partial immersion of the transmission parts in the cooling oil does not guarantee reliable dissipation of the heat loss offers, but that a spray cooling by means of pressure oil is required. It stands to reason, a part of this pressure oil that is promoted by a hydraulic pump, to be used sensibly for other tasks.

409885/0285

The object of the invention is, in the case of transmissions, of the type described at the outset Type to ensure sufficient contact pressure for all operating conditions that occur. This particularly means that the Speed adjustment enough contact pressure is maintained to cover the shifting transmission parts - races and rolling elements below to hold so great a pressure that positive and negative accelerations are possible. Generate mechanical contact pressure regulators a contact force proportional to this only when a torque is reduced. If the gear is adjusted in the unloaded state, it loses the contact between the transmission parts due to a lack of contact pressure and at least a rapid speed adjustment becomes impossible.

This object is achieved according to the invention in that

a) the transmission parts, as long as the transmission is not running or is straight is switched on, an axial force F is applied by a mechanical energy storage device, e.g. disc springs

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b) shortly after start-up by the pump pressure ρ, an additional hydraulic axial force F _TT becomes effective via a hydraulic piston with the acted upon area F and

c) when a torque is reduced for which the sum of the axial forces F + F is no longer sufficient, the mechanical contact pressure

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controller in the usual way due to its wedge effect a torque proportional mechanical axial force F generated.

Structurally, this object can be achieved in two ways: Fig. 1 shows the combined contact pressure regulator for a rolling gear of a general nature, preferably shown is a ball rolling mechanism, in which, depending on the operating state in the contact point A between Race and rolling element either only F, F + F or F + F + F

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acts as an axial force.

With this solution, the forces F and F always occur additively to the

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possibly prevailing force F, because the with the spring force and the hydraulic pressure applied piston 10 via a thrust bearing 15 is supported against the support disc 13 and so no torque

409885/0285

can transfer. The entire torque acts via the race 4, the cylinder 9 via the rolling elements 12 against the support disk 13 Run-up ramps 18. This solution has the advantage that the run-up ramps can be steeper than in the proposed solution according to FIG. 2. It has but the disadvantage that the rolling elements 12 of the mechanical part are not always kept in contact and for a reliable function the cage 16 must be entrained by a certain uniform friction from the cylinder part 9 so that when the speed is adjusted Transmission or during the transition from idling to load, the rolling elements 12 reliably come into contact with the run-up ramps 18 of the support disk 13 and get to the cylinder part 9. This entrainment is further achieved according to the invention in that a force storage means 17 between Piston 10 and cage 16 a defined, not too great friction is generated. Piston 10 and cylinder 9 have the mechanical frictional connection Via the energy storage means 11 and the seals 19, the same rotational speed.

Fig. 2 shows a similar combined contact pressure regulator, in which the structural design either F ₇ ^, F + F and

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when F, “but only this F _, - becomes effective.

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The advantage of this construction is that the rolling elements 12 of the mechanical part are always in contact with the overrun ramps 18 on the piston 10 and the support disc 13. The run-up ramps 18 could also be attached to the support disc 13. With this solution, the torque becomes so large that the sum

the F + F forces are no longer sufficient for slip-free transmission, K H

a "total force F ₁ ^. is generated by the mechanical part, which brings the piston 10 against the forces F and F axially against the fixed stop to the cylinder 9. In this solution, the piston 10 and cylinder 9 must be non-rotatably connected to one another, for example by means of pins

A09885 / 028b

Claims (2)

Expectations Mechanical contact pressure regulator for rolling gears A ^ i-with four concentrically arranged races one Form an annulus in which the rolling elements run and in which the speed is increased by axially shifting one or more Races can be changed continuously, characterized in that at standstill and when Starting the transmission parts (1 to 5) are loaded by mechanical energy storage means (11) that during the Starting up and in the operating state up to a certain power transfer via a pressurized hydraulic piston (10) additional contact pressure is applied and that with a further increase in the power transmission a normal Wise working mechanical contact pressure regulator through axial run-up ramps (18) and their wedge effect the additionally required Contact pressure or the then total required contact force is generated proportional to the torque taken. 2. Contact pressure regulator according to claim 1, in which only the additionally required contact force is generated mechanically, characterized in that the rolling body cage (16) of the mechanical part by a force storage means (17) with a defined friction force that remains constant over the service life of the gear unit is applied. 40988b / Ü286