SU1281786A1 - Worm reduction unit - Google Patents

Abstract

The invention relates to reduction gearing and can be used in drives of various machines. The purpose of the invention is to increase the load capacity. In the screw-worm gearbox, the screw-worm 2 is covered with a gap by the evaporator 4 heat pipes with the possibility of movement in a plane perpendicular to the axis of the screw shaft. The heat generated by the operation of the gearbox is perceived by the lubricant in the contact zone of the screw 2 and the worm gear 3. The lubricant is squeezed out of this zone and washes the walls of the evaporator 4, increasing the pressure in it. Par dviss

Description

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1281786

is transported through the transport tube 7, the last vapor is condensed and the expanding screw K 2 and the evaporator 4 s are sown into the surrounding space, by a condenser 5. On the cold walls 2 silt.

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The invention relates to a gearbox. and can be used in drives of various machines.

The aim of the invention is to increase the load capacity and durability of the gearbox due to the location of the heat pipe evaporator outside the screw and the worm gear.

Fig, I shows a worm gearbox, a general view; figure 2 - section aa in figure 1.

The worm gearbox comprises a housing 1, a worm to 2, a worm gear 3 and a cooling device in the form of an evaporator 4, made for example in the form of a duct having double walls forming a closed space, and a condenser 5, for example, in the form of a closed cylindrical vessel , finned from the outside and installed outside the gearbox. On the walls of the evaporator 4, a capillary layer 6 is fixed on the side of a closed space, for example, of porous material or a multilayer mesh. The condenser 5 is connected to the evaporator; 4 transport tube 7, forming a closed hermetic system - a heat pipe. The evaporator 4 has brackets 8 which are slitwise displaced relative to the studs 9 secured in the housing 1 with nuts 10

The gearbox works as follows. one

Inside the heat pipe pour working fluid, such as water, acetone, methylene, ethylene and fluorinated hydrocarbons, in the optimal amount. In the heat pipe, a pressure is created at which the boiling point of the working fluid corresponds to the temperature of the lubricant, which must be created near the contact area of the screw 2 and the worm gear 3. The heat pipe is pre-sealed. When you turn on the reducer in the work in 15

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As a result of the friction of the contact surfaces of the worm 2 and the worm gear 3, heat is generated, which is perceived by the lubricant in the contact zone. The heated lubricant is squeezed out of the contact zone and, washing the walls of the evaporator 4 and the heat pipe, transfers them the heat released during friction. Since the walls of the evaporator with a small gap cover the zone of contact between the screw and the worm wheel, the thermal resistance during the transfer of the heat generated to the wall is. heat pipe is small. The moving turns of the screw and the gear of the worm wheel enhance the convective heat exchange between the lubricant and the walls of the evaporator and contribute to the stabilization of the lubricant temperature near the contact zone.

The working fluid, located on the walls of the evaporator 4 in the capillary layer 6, absorbs heat and evaporates. This causes an increase in vapor pressure in the evaporator 4, with the result that the steam moves along the transport tube 7 to the condenser 5. On the cold walls of the condenser 5, the steam condenses, giving off heat, which is then dissipated by the walls and fins of the condenser and blown away by the surrounding air. Condensed working fluid from condenser 5 along the walls of the transport tube 7 flows under the action of gravitational forces into the evaporator 4, accumulates at its bottom and through the capillary layer 6 again spreads through the walls of the evaporator 4. If the condenser 5 is not installed high enough above the evaporator 4, so that the condel - Sat flowed under the action of gravitational forces, the capillary layer is also attached to the walls of the condenser 5 and the transport tube 7, which contributes to the return of the condensate I

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Claims (1)

Invention Formula Worm gearbox containing the worm gear, the housing, the worm gear and 5 o 15 a device for cooling in the form of an evaporator and a condenser, characterized in that, in order to increase the load capacity and durability of the reducer, a hole is made in the housing, the non-working surface of the screw is placed with a gap relative to the evaporator, and the reducer is equipped with brackets fixed on the evaporator and mounted in the housing movable in a plane perpendicular to the axis of the screw shaft; and a transport tube passing through the opening and connecting the condenser to the evaporator. (rig.1 Compiled by R. Ozhin. Editor O. Yurkovetskaya Tehred A. Kravchuk Proofreader L. Patay Order 7242/31 Circulation 810 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, Projecto st., 4