SU380163A1 - Hydrostatic bearing - Google Patents

Description

I

The invention relates to the field of mechanical engineering and can be used for high-frequency spindle units of machine tools.

A hydrostatic support is known, containing a sleeve enclosing the shaft on which the receiving pockets are located, communicating through channels with diametrically opposed carrying pockets.

However, in such supports it is impossible to vent the central holes in the shaft of a sufficiently large diameter, necessary for the passage of the rods of the device for adjusting the cutter, the central cooling supply. When making connecting channels with a large offset from the shaft axis, lubricant supply to the bearing pockets cannot be made in the center of the pocket, which worsens the anisotropy conditions of the bearing operation, and the execution of connecting channels with mixing from the shaft axis limits the reduction of the bearing dimensions.

The purpose of the invention is to expand the possibilities of using the support.

This is achieved by the fact that the support is provided with an additional sleeve in the central hole provided in the shaft with screw grooves on the outer surface in an amount corresponding to the number of receiving and bearing pockets, and each channel is made short-circuit of two sections connecting respectively one of the receiving pockets with n “chalsm of one of the screw grooves and the end of the grooves with one of the carrying pockets.

In addition, to prevent deformation of the shaft, the additional sleeve is made of a material with a modulus of elasticity less than the modulus of elasticity of the shaft.

Claims (2)

FIG. 1 shows the proposed support; in fig. 2 - section A-A of FIG. one; in fig. 3 - section bb FIG. 2; in fig. 4 shows a section bb of FIG. one; in fig. 5 - raververtka on the outer diameter of the additional sleeve. The support contains a sleeve housing 1, having a Shuya underwater hole 2 and a sheeting shaft 3, on which the tfiema groove 4, receiving pockets 5 and carrying pockets 6 are located. At the end of the shaft disk 3, the thrust bearing chamber 7 is full. 8, the cylindrical bone of which forms an entrance throttling gap with the inner surface of the sleeve-housing. According to juice 9, there is a separation delimit between the receiving and carrying pockets. The cylindrical surface of the 1O forms with the inner surface of the sleeve-housing a single throttling shell. Receiving pockets 5 in radial. the direction is separated from each other by bridges 11, carrying pockets - bridges 12. The shaft 3 is provided with a central hole in which an additional bushing 13 is pressed with helical grooves 14 on the outer surface, made at an angle about the axis of the bushing. In addition, channels 3 are made in the shaft 3, which communicate receiving pockets 5 with diametrically opposite carrying pockets 6. The channels consist of sections 15 and 16. Section 15 informs the receiving pocket with the start of one of the screw grooves 14, and the end of this groove through section 16 the channel communicates with the corresponding non-drying pocket 6. The blind 13 has a central opening through which, for example, the tool can be repositioned and the central cooling can take place. When a load is applied, P is shaft 3; mixed down, the pressure of the working medium in the upper receiving pocket 5 increases, and in the lower decreases. In the laying of the lower pocket 6, the pressure increases in connection with the increase in pressure in the upper receiving pocket connected to it and with a decrease in the output neck. In the carrying upper pocket, the pressure is reduced for the same reasons. In this case, the pressure difference in the upper and lower bearing pockets ensures the appearance of a restoring force opposite in sign to the load force R. The support shaft. Always strives to occupy a central position. The sections 15 and 16 of the connecting channel can be performed, depending on the need, diametrically or at an angle to the axis of the shaft. The angle of inclination is chosen taking into account the size of the support and the required place for supplying lubricant in the bearing pockets 6. To prevent deformation of the shaft when pressing in the screw 13, material with a significantly lower elastic modulus than the material of the shaft is chosen for it. For example, the sleeve 13 is made of fluoroplast. Claim 1. Hydrostatic support containing a sleeve, which encloses the shaft, on which the receiving pockets are located, communicating through channels with diametrically opposite bearing pockets, which is equipped with an additional one located in the central the hole provided in the shaft, a sleeve with helical grooves on the outer surface in an amount corresponding to the number of receiving and bearing pockets, and each of the channels is made of two sections, with OSH1N from receiving pockets, respectively, with the beginning of one of the helical grooves and the end of the groove with one of the carrying pockets. 2. A support according to claim 1, in which it is necessary, in order to prevent deformation of the shaft, the additional sleeve is made of a material with a modulus of elasticity less than the modulus of elasticity of the shaft.  i-j-rtuftyKfaasKtva.if Bb