Static pressure spindle

Abstract

The utility model discloses a static pressure main shaft which comprises a shell, a main shaft and bearing bushes, the main shaft is concentrically arranged in the shell, a section of step is concentrically arranged on the inner wall of the shell, a through hole extending in the axial direction of the shell is formed in the step, and the bearing bushes are arranged in the shell and located at the two ends of the step. A first annular groove communicated with the through hole is formed in the end, facing the through hole, of the bearing bush in an inwards-concave mode, an oil cavity is formed in the inner wall of the bearing bush in an inwards-concave mode, oil feeding holes communicated with the oil cavity are formed in the first annular groove in an annular array mode, and an oil inlet hole communicated with the through hole is formed in the shell. According to the energy-saving static pressure main shaft, pressure oil is fed into the first ring groove through the through hole and then is uniformly fed into the oil cavity through the oil feeding holes, an oil film is directly formed between the inner wall of the bearing bush and the outer wall of the main shaft, the oil-saving effect is improved, and the energy consumption and the maintenance cost of circulating oil supply are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to static pressure main shaft technical field especially relates to a static pressure main shaft. BACKGROUND

[0002] The static pressure main shaft generally forms stable oil film in bearing oil cavity through pressure oil, uses oil film to support the main shaft, makes the main shaft keep suspended state in starting and high speed rotation stage, reduces mechanical contact, realizes the high-precision, low friction operation of main shaft.

[0003] The oil supply of static pressure main shaft can adopt constant pressure closed loop oil supply, in order to save the dosage of pressure oil, can adopt oil economizer. In the prior art, the utility model discloses a horizontal high-precision static pressure main shaft device in the patent with the application number 2024200191351, by setting up connecting pipe and oil economizer, pressure oil can be injected more reasonably between the shaft sleeve and the main shaft, the formation of pressure oil film is facilitated, friction and vibration are reduced, but the oil economizer cannot inject pressure oil directly into the gap between the bearing and the main shaft, the oil saving effect is limited, and the oil economizer needs to be purchased, the maintenance cost is increased, and improvement is needed. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a static pressure main shaft, improves the oil saving effect and reduces the maintenance cost.

[0005] In order to achieve this purpose, the utility model adopts the following technical scheme:

[0006] A static pressure main shaft, comprising: a shell, a main shaft and a bearing bush, the main shaft is concentrically arranged in the shell, a step is arranged on the inner wall of the shell, a through hole extending along the axial direction of the shell is arranged in the step, the bearing bush is arranged in the shell and located at both ends of the step, a first annular groove is arranged in the end of the bearing bush facing the through hole and communicated with the through hole, an oil cavity is arranged in the inner wall of the bearing bush, a plurality of oil supply holes are arranged in the first annular groove and communicated with the oil cavity, and an oil inlet hole is arranged on the shell and communicated with the through hole.

[0007] Among them, the shell and the step adopt an integrated structure.

[0008] Among them, the second annular groove is arranged in the shell and located outside the bearing bush, and a check ring is arranged in the second annular groove.

[0009] Among them, the gap between the inner wall of the bearing bush and the outer wall of the main shaft is 0.002-0.005mm.

[0010] Among them, the diameter of the oil supply hole is 0.1-0.2mm.

[0011] Among them, the side of the shell opposite to the oil inlet hole is provided with an oil outlet hole.

[0012] The beneficial effects of this utility model are as follows: A hydrostatic spindle with a specially designed bearing structure allows pressurized oil to be fed into the first annular groove through a through hole, and then evenly fed into the oil chamber through multiple oil supply holes, forming an oil film directly between the inner wall of the bearing and the outer wall of the spindle, which improves the oil-saving effect, helps to reduce the energy consumption of circulating oil supply, eliminates the need to purchase an external oil-saving device, and reduces maintenance costs. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 yes Figure 1 Left view of the central bearing. Detailed Implementation

[0015] The following is combined Figures 1 to 2 The technical solution of this utility model will be further illustrated through specific embodiments.

[0016] like Figure 1 The energy-saving hydrostatic spindle shown includes: a housing 1, a spindle 4 and a bearing 2. The spindle 4 is concentrically arranged in the housing 1. The housing 1 is provided with covers at both ends to limit the axial movement of the spindle 4 and can also be fitted with pressure bearings to avoid friction problems.

[0017] A protruding step 13 is concentrically provided on the inner wall of the housing 1. In this embodiment, the housing 1 and the step 13 adopt an integrated steel structure, which has high stability. A through hole 14 extending along the axial direction of the housing 1 is provided in the step 13. An oil inlet hole 11 communicating with the through hole 14 is provided on the housing 1. An oil supply pipeline is connected to the oil inlet hole 11, and pressurized oil is supplied to the oil inlet hole 11 and the through hole 14 by an oil pump.

[0018] The bearing bush 2 is disposed in the housing 1 and located at both ends of the step 13. In this embodiment, the housing 1 is provided with a second annular groove 15 located on the outside of the bearing bush 2. A retaining ring 3 is provided in the second annular groove 15 to limit the bearing bush 2 axially and prevent it from loosening.

[0019] like Figure 1 As shown, a first annular groove 21 communicating with the through hole 14 is recessed at one end of the bearing bush 2 facing the through hole. The first annular groove 21 is sealed by the inner wall of the housing 1 and the step 13, forming a closed first annular groove 21, so that the pressure oil in the through hole 14 can smoothly enter the first annular groove 21.

[0020] like Figure 2As shown, an oil cavity 23 is recessed in the inner wall of the bearing bush 2, and an oil supply hole 22 communicating with the oil cavity 23 is arranged in a ring array in the first annular groove 21. The pressurized oil in the first annular groove 21 is evenly supplied to the oil cavity 23 through multiple oil supply holes 22. In this embodiment, the diameter of the oil supply hole 22 is 0.1 to 0.2 mm, which is relatively small and helps to improve the fuel-saving effect.

[0021] In this embodiment, the gap between the inner wall of the bearing bush 2 and the outer wall of the main shaft 4 is 0.002 to 0.005 mm. The pressurized oil in the oil chamber 23 enters the housing 1 through the gap and forms an oil film directly between the inner wall of the bearing bush 2 and the outer wall of the main shaft 4. This results in good oil saving and eliminates the need to purchase an external oil saver, thus reducing maintenance costs.

[0022] like Figure 1 As shown, an oil drain hole 12 is provided on the side of the housing 1 opposite to the oil inlet hole 11. The oil drain hole 12 is connected to the return oil pipeline to send the pressurized oil back to the oil tank. The oil pressure can be kept stable by installing a constant pressure valve in the oil drain hole 12, and the energy consumption of the circulating oil supply can be reduced.

[0023] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. A hydrostatic spindle, characterized in that, include: The housing, spindle, and bearing are provided. The spindle is concentrically disposed in the housing. A step is concentrically disposed on the inner wall of the housing. A through hole extending along the axial direction of the housing is provided in the step. The bearing is disposed in the housing and located at both ends of the step. A first annular groove communicating with the through hole is recessed at the end of the bearing facing the through hole. An oil cavity is recessed in the inner wall of the bearing. An oil supply hole communicating with the oil cavity is arranged in a ring array in the first annular groove. An oil inlet hole communicating with the through hole is provided on the housing.

2. The hydrostatic spindle according to claim 1, characterized in that, The shell and the steps are integrated into one structure.

3. The hydrostatic spindle according to claim 1, characterized in that, The housing has a recessed second annular groove located on the outer side of the bearing bush, and a retaining ring is provided in the second annular groove.

4. The hydrostatic spindle according to claim 1, characterized in that, The gap between the inner wall of the bearing bush and the outer wall of the main shaft is 0.002~0.005mm.

5. The hydrostatic spindle according to claim 1, characterized in that, The diameter of the oil supply hole is 0.1~0.2mm.

6. The hydrostatic spindle according to claim 1, characterized in that, An oil drain hole is provided on the side of the housing opposite to the oil inlet hole.

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