HU189380B - Friction pair of surfaces for synchronizing devices of reversing gear drives - Google Patents

Abstract

A cone clutch for use in synchronising equipment of a gear transmission, comprises a hardened steel sleeve (3) with a frustro-conical internal surface (5), and an aluminium alloy cone (1) with a frustro-conical external surface (2) formed with grooves (4), the sleeve and the cone being relatively movable to effect frictional coupling thereof at the two surfaces (2, 5). The alloy has a maximum Brinell hardness of 130 and its constituents include silicon, copper, nickel, magnesium, manganese and titanium. <IMAGE>

Description

FIELD OF THE INVENTION The present invention relates to a pair of friction surface surfaces for synchronization devices of geared gear motors.

Friction surface pairs are required for synchronization devices where ^{/ to} create synchronous heating, individual parts of the synchronization device interact with conical friction surfaces and ensure the synchronous running of the rotating gear parts during the coupling process in accordance with the principle of friction clutches.

In various synchronization devices, where conical friction surfaces interact with one another, various known slip friction materials, such as noble brass, bronze, molybdenum coated, slip friction metal surface and / or hardened steel surface have grooved recesses to drain the lubricating oil from the contact surfaces and provide sufficient friction coefficient in the mixed friction range.

The prior art solutions for friction surface pairs have the following disadvantages:

- low surface strength of grooved surface when using noble brass and bronze, leading to abrasion and malfunction,

- high material costs and increased production costs for molybdenum plating,

- manufacturing overhead with oxide- and multi-component surfaces,

- low resistance to heat and deformation when using plastics,

- high abrasion and hardened steel counter-tapered surfaces of molybdenum, oxide or hard material leading to malfunction.

It is an object of the present invention to overcome the drawbacks of the present state of the art.

SUMMARY OF THE INVENTION The object of the present invention is to provide a pair of friction surfaces that have almost no abrasion in the friction process, the material used for its frictional friction is easy to work with, relatively low material costs and no additional coating required.

Special materials are provided for frictional contact between the following parts of the synchronization device:

- The friction cone for sliding friction consists of aluminum alloy, the main alloys of which are silicon (11-23%), copper (1-3.5%), nickel (0.8-2.7%). magnesium (up to 1.5%), manganese (up to 0.5%) and titanium (up to 0.2%) and having a Brinell hardness of max. 130 HB, which provides satisfactory compressive strength at Iztosft at higher temperatures. Because of the low tensile strength of this material, it is only used under pressure in the friction process, and the tensile and compressive inputs must balance each other. The conical surface is provided with grooves known in the art for draining the lubricating oil.

- Known counter-cone of hardened steel with a smooth surface such as a polished taper, which is subjected to drawing or pressing in the friction process.

The frictional contact of the two materials undergoes a known combination of physico-chemical processes under the thermal conditions which result in the formation of a metallic protective film which almost completely prevents frictional wear on the contact surfaces.

DETAILED DESCRIPTION OF THE INVENTION The present invention will now be described in more detail with reference to the accompanying drawing. In the drawing, Fig. 1 is a partial sectional view of a pair of friction surfaces according to the invention, and Fig. 2 is also a partial longitudinal section of a friction cone made of an aluminum alloy.

Fig. 1 is a longitudinal sectional view of a pair of friction surfaces, wherein the friction cone 1 used for sliding friction consists of an aluminum alloy according to the invention and has a conical surface 2 which is in contact with a counter-cone 3 having grooves 4 for draining the lubricating oil; take into account the low tensile strength of the aluminum alloy material that this surface is subjected to only compressive stress during the frictional process. The counter-cone 3 is made of hardened steel and the surface of the conical aluminum alloy 2 is smooth with a contact surface 5 It has. This component is used for pulling in the arrangement shown in Figure 1.

The friction cone 1 of aluminum alloy shown in Fig. 2, which is in frictional contact with the counter-cone 3, besides the conical surface 2, also has a conical surface 6 formed on the inner casing, which also has a frictional contact. further provided with counter-cones 7 and grooves 8 known per se for draining the lubricating oil. In this arrangement, the compressive and tensile stresses compensate for each other. The ring cone 3 is made of hardened steel and is provided with a smooth, e.g. brushed, conical surface 5 for contact with the conical surface 2 made of aluminum alloy. This part is under pressure during the friction process.

Claims (1)

A patent claim A pair of friction surface surfaces for synchronizing devices of gear reversing gears, wherein the components of the synchronizing device are operatively connected to the conical friction surfaces to create a synchronous run, and during the switching process, is formed between a friction cone (1) for sliding friction and a counter-cone (3, 7) made from hardened steel known in the art, wherein the main alloys of the aluminum alloy of the friction cone (1) providing sufficient compressive strength at higher temperatures are , copper (1-3.5%), nickel (0.8-2.7%). magnesium (up to 1.5%), manganese (up to 0.5% 4g) and titanium up to 0.2%) and Brinell hardness up to max. 130 HB, furthermore, its conical surface (2, 6) is provided with lubricating oil drain grooves (4, 8) and is used only under pressure during the friction process, ) is smooth, for example, with a polished cone fragrance (5, 9) and is used for pulling or pressing in the friction process.