Hydrostatic bearing spindle device

Abstract

The utility model discloses a kind of static pressure bearing main shaft device, including rotating main shaft and static pressure bearing main body;The both ends of rotating main shaft are positioned with the sleeve positioned by positioning structure, and the outer end of sleeve is interference fit with the inner ring of static pressure bearing main body, and then realize the low friction rotation of rotating main shaft.The utility model is positioned with the sleeve of both ends and the interference fit of static pressure bearing inner ring, and is combined with the precision positioning structure of positioning ring and positioning column, effectively guarantee the concentricity between rotating main shaft and bearing, prevent radial deviation, ensure the rotation accuracy and operating stability of main shaft under high speed.

Description

Technical Field

[0001] This utility model relates to a spindle device, specifically a hydrostatic bearing spindle device. Background Technology

[0002] In similar mechanical spindle devices, traditional bearings suffer from clearance or increased clearance due to wear, leading to significant vibration and radial runout of the spindle during high-speed operation, thus affecting machining accuracy. Rolling bearings, in particular, experience high contact stress due to point or line contact, making them prone to fatigue wear and limiting their service life. Simple oil lubrication may fail to form a uniform and stable oil film, resulting in localized frictional heating, temperature rise, and impacting spindle thermal deformation and accuracy retention. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a hydrostatic bearing spindle device to solve the problems existing in the background art.

[0004] The hydrostatic bearing spindle device of this utility model is achieved through the following technical solution, including a rotating spindle and a hydrostatic bearing body;

[0005] Both ends of the rotating spindle are equipped with bushings through a positioning structure, and the outer end of the bushing is interference-fitted with the inner ring of the hydrostatic bearing body, thereby achieving low-friction rotation of the rotating spindle.

[0006] As a preferred technical solution, the rotating spindle is arranged in a stepped shape, and the bushing is positioned on the stepped section of the rotating spindle by a positioning structure.

[0007] As a preferred technical solution, the positioning structure includes a positioning ring and a positioning post;

[0008] Multiple positioning pins are provided and arranged around the positioning ring; the stepped section of the rotating spindle is provided with positioning holes corresponding to the positioning pins, and the positioning pins are inserted into the positioning holes, thereby realizing the connection between the rotating spindle and the bushing.

[0009] As a preferred technical solution, the positioning ring is set on the bushing to prevent misalignment between the bushing and the rotating main shaft.

[0010] As a preferred technical solution, the hydrostatic bearing body is provided with a lubricating oil inlet and a lubricating oil outlet;

[0011] The lubricating oil inlet is connected to an external lubricating oil supply system. The lubricating oil enters the hydrostatic bearing housing from the lubricating oil inlet for lubrication, and then flows out from the lubricating oil outlet, forming a circulating lubrication system to ensure low-friction rotation and good working performance of the device.

[0012] As a preferred technical solution, one end of the rotating spindle is provided with a transmission connection part for connecting with an external power device to drive the rotating spindle to rotate.

[0013] The beneficial effects of this utility model are:

[0014] This invention effectively ensures the concentricity between the rotating spindle and the bearing by using bushings at both ends that are interference-fitted with the inner ring of the hydrostatic bearing, combined with a precision positioning structure of positioning ring and positioning column, thus preventing radial offset and ensuring the rotational accuracy and operational stability of the spindle at high speeds.

[0015] This invention utilizes an external oil supply system to form forced circulation lubrication, creating a stable hydrostatic oil film between the spindle and bearings. This achieves pure liquid friction, significantly reducing wear and temperature rise, thereby extending the service life of the spindle and bearings.

[0016] This invention provides a clear installation reference for the bushing through a stepped main shaft. The combination structure of the positioning ring and multiple positioning pins not only ensures a firm connection and effective torque transmission, but also restricts the circumferential and axial movement of the bushing, preventing relative sliding or offset between it and the main shaft. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0019] Figure 2 This is a schematic diagram of the exploded structure of this utility model;

[0020] Figure 3 This is a schematic diagram of the bushing structure of this utility model.

[0021] Explanation of reference numerals in the attached figures

[0022] 1. Rotating spindle; 2. Hydrostatic bearing body; 3. Bushing; 4. Locating ring; 5. Locating pin; 6. Locating hole; 7. Lubricating oil inlet; 8. Lubricating oil outlet; 9. Inlet pipeline; 10. Outlet pipeline; 11. Transmission connection. Detailed Implementation

[0023] All features disclosed in this specification, or all steps in all disclosed methods or processes, may be combined in any way, except for mutually exclusive features and / or steps.

[0024] like Figures 1 to 3 As shown, this utility model discloses a hydrostatic bearing spindle device, comprising a rotating spindle 1 and a hydrostatic bearing body 2. Both ends of the rotating spindle 1 are fitted with bushings 3, which are reliably positioned with the rotating spindle 1 via a positioning structure. The outer end of each bushing forms an interference fit with the inner ring of the hydrostatic bearing body 2, thereby achieving low-friction or even near-frictionless rotation under the action of an external oil supply system.

[0025] To ensure a stable connection between the bushing 3 and the rotating spindle 1, the rotating spindle 1 is machined into a stepped structure, with an installation reference formed at the stepped section. The bushing 3 is positioned and installed on the stepped section by a positioning structure. Specifically, the positioning structure consists of a positioning ring 4 and multiple positioning posts 5. The positioning ring 4 is fixed to the inner end face of the bushing 3, and the multiple positioning posts 5 are evenly distributed in the circumferential direction of the positioning ring 4.

[0026] To cooperate with the positioning pins 5, positioning holes 6 are machined at corresponding positions on the stepped section of the rotating spindle 1. When the positioning pins 5 are inserted into the positioning holes 6, they can simultaneously restrict the radial and axial displacement of the bushing 3, preventing relative slippage or deflection. Typically, the number of positioning pins 5 can be 3 to 12, preferably evenly distributed to ensure assembly accuracy and balanced force.

[0027] Based on the above structure, an annular oil chamber is provided in the inner cavity of the hydrostatic bearing body 2, and several throttling holes are evenly distributed in the oil chamber. When external lubricating oil enters the hydrostatic bearing body 2 through the lubricating oil inlet 7, it enters the oil chamber through the throttling holes and forms a stable hydrostatic oil film between the spindle surface and the inner surface of the bearing.

[0028] This oil film supports and suspends the rotating spindle 1, thus converting direct metal-to-metal contact into fluid friction. After fulfilling its supporting and lubricating functions, the lubricating oil flows out through the lubricating oil outlet 8 located on the hydrostatic bearing body 2, and returns to the external oil supply system via the outlet pipe 10, forming a circulation loop. To ensure oil film stability, the lubricating oil inlet 7 is connected to an external high-pressure oil supply device via the inlet pipe 9. The oil supply pressure can be selected within the range of 0.3 MPa to 2.0 MPa, with appropriate pressure and flow rate chosen based on the spindle size and load requirements.

[0029] To ensure the transmission function, a transmission connection part 11 is provided at one end of the rotating spindle 1. This transmission connection part 11 can be machined into a keyway structure, a flange structure, or a tapered hole structure, so as to reliably connect with external power equipment such as motors and gearboxes, and realize the high-speed rotation of the rotating spindle 1.

[0030] Through the above design, the spindle can maintain stable, low-friction high-speed operation under the support of hydrostatic oil film, driven by the power equipment.

[0031] In actual use, the assembly sequence of the spindle 1 and the hydrostatic bearing body 2 is as follows: First, the bushing 3 is assembled on the stepped section of the spindle 1, and the bushing 3 is precisely positioned with the spindle 1 by the positioning ring 4 and the positioning pin 5; then the outer end of the bushing 3 is inserted into the inner ring of the hydrostatic bearing body 2 to form an interference fit.

[0032] Finally, connect the lubricating oil inlet 7 to the external oil supply system and the lubricating oil outlet 8 to the return oil system. After assembly, the oil supply system is activated, and the lubricating oil enters the bearing oil chamber, forming a hydrostatic oil film support, thereby achieving smooth rotation of the spindle 1.

[0033] Through the above embodiments, the present invention has advantages in the following aspects:

[0034] First, the combination of interference fit and locating pin ensures the concentricity of the spindle and bushing, thus improving assembly accuracy.

[0035] Secondly, the static pressure oil film formed by external oil supply effectively reduces friction and wear, reduces temperature rise, and extends the service life of the device;

[0036] Third, the structure provides clear assembly standards and implementable oil supply parameters, enabling those skilled in the art to easily manufacture and apply the device.

[0037] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions conceived without inventive effort should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope defined in the claims.

Claims

1. A hydrostatic bearing spindle assembly, characterized in that, It includes a rotating spindle (1) and a hydrostatic bearing body (2); Both ends of the rotating spindle (1) are equipped with bushings (3) through a positioning structure, and the outer end of the bushing (3) is interference-fitted with the inner ring of the hydrostatic bearing body (2), thereby realizing low-friction rotation of the rotating spindle (1); the rotating spindle (1) is arranged in a stepped shape, and the bushing (3) is positioned on the stepped section of the rotating spindle (1) through the positioning structure; the positioning structure includes a positioning ring (4) and a positioning column (5); Multiple positioning pins (5) are provided and arranged around the positioning ring (4); the stepped section of the rotating spindle (1) is provided with positioning holes (6) corresponding to the positioning pins (5), and the positioning pins (5) are inserted into the positioning holes (6) to realize the connection between the rotating spindle (1) and the bushing (3).

2. The hydrostatic bearing spindle assembly according to claim 1, characterized in that: The positioning ring (4) is disposed on the bushing (3) to prevent the bushing (3) from shifting away from the rotating main shaft (1).

3. The hydrostatic bearing spindle assembly according to claim 1, characterized in that: The hydrostatic bearing body (2) is provided with a lubricating oil inlet (7) and a lubricating oil outlet (8); The lubricating oil inlet (7) is connected to an external lubricating oil supply system. The lubricating oil enters the hydrostatic bearing body (2) from the lubricating oil inlet (7) for lubrication, and then flows out from the lubricating oil outlet (8). This forms a circulating lubrication system, ensuring low-friction rotation and good working performance of the device.

4. The hydrostatic bearing spindle assembly according to claim 1, characterized in that: One end of the rotating main shaft (1) is provided with a transmission connection part (11); The transmission connection part (11) is used to connect with an external power device to drive the rotating main shaft (1) to rotate.

5. The hydrostatic bearing spindle assembly according to claim 3, characterized in that: The lubricating oil inlet (7) is provided with an inlet pipe (9), and the lubricating oil outlet is provided with an outlet pipe (10); the lubricating oil inlet (7) is connected to an external lubricating oil supply system through the inlet pipe (9).

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