A slit-adjustable hydrostatic thrust bearing

Abstract

The application discloses a slit-adjustable static pressure thrust bearing which mainly comprises a bearing base body, an elastic slit block and a conical thread sleeve. The elastic slit block is provided with conical threads along the circumference, and is connected and fastened with the conical thread sleeve through the conical threads. The slit width is adjusted through the tightening degree, and throttling is realized. The application belongs to the field of air bearings. Through the setting of the conical threads and the elastic slit block, the slit width can be adjusted, thereby reducing the machining difficulty of the slit. The adjustable slit width can also be used to improve the load capacity and stiffness of the bearing, and further improve the performance of the bearing.

Description

Technical Field

[0001] This invention relates to the field of air bearing technology, specifically providing a hydrostatic thrust bearing with adjustable slits. Background Technology

[0002] Air bearings are sliding bearings that use air as a lubricant. They are characterized by low frictional resistance and high rotational accuracy, and generate almost no heat under high-speed operation. Therefore, they are widely used in high-precision measuring instruments and high-precision machine tools. Air bearings employ various throttling methods, including slot throttling, orifice throttling, surface throttling, and porous throttling. Compared to orifice throttling, which suffers from poor stability due to cavities, surface throttling, which has low stiffness and load-bearing capacity, and porous throttling, which requires high-quality materials and high-purity air, slot throttling reduces the adverse effects of diffusion on the bearing. Furthermore, the absence of air cavities results in better stability, making it more suitable for high-reliability and high-precision applications. However, to ensure effective throttling, the slot width of slot-type bearings is typically less than 0.1 mm. Machining a slot width of less than 0.1 mm falls under the category of precision machining, which is usually complex and difficult. Summary of the Invention

[0003] In view of this, in order to solve the problems of high precision requirements and high difficulty in machining the slits in existing slit-type hydrostatic bearings, this invention provides a hydrostatic thrust bearing with adjustable slits.

[0004] To address the problems existing in the prior art, the technical solution of the present invention is: an adjustable slit hydrostatic thrust bearing, comprising a bearing base, an elastic slit block, and a tapered thread sleeve, characterized in that: a tapered thread is provided on the circumference of the elastic slit block, the tapered thread cooperating with the tapered thread sleeve, and the width of the coarse slit distributed at the bottom of the elastic slit block is adjusted by the tightness between the two, so as to achieve a throttling width, thereby realizing the slit throttling effect of the hydrostatic bearing, and further adjusting the width of the throttling slit can change the bearing load capacity.

[0005] Preferably, the bearing base has an internal air cavity, which can be cylindrical or annular, and air is introduced through an air inlet. The air cavity is used to store high-pressure gas and supply air to the slit.

[0006] Preferably, the elastic slit block is frustum-shaped with a taper of 21.8°. The upper end face of the slit block is hollowed out to a certain depth to communicate with the air cavity. The elastic slit block is provided with a tapered thread along the circumferential direction. The pitch of the tapered thread is 1 mm and the height is 5 mm.

[0007] Preferably, the slits distributed at the bottom of the elastic slit block have a width of 0.1-0.2 mm, and the slits are evenly and discontinuously distributed along the circumference, with the length of the slit-free section being less than 10% of the circumference of the slit section.

[0008] Preferably, the slits distributed at the bottom of the elastic slit block can be single-circumferential slits, double-circumferential slits, or multi-circumferential slits, and the shape of the slits can be a zigzag slit or an arc slit.

[0009] Preferably, when the elastic slit block is tightened by the tapered thread sleeve, the width of the slit at its bottom will change, and the width will change differently depending on the degree of tightening, thereby achieving different throttling effects.

[0010] Preferably, the inner ring of the tapered thread sleeve has an outwardly expanding tapered thread with a pitch of 1 mm and a height of 5 mm, which mates with the outer tapered thread of the elastic slit block.

[0011] Preferably, the bearing base has an annular groove at its lower end where it connects to the elastic slit block, to accommodate the tightening allowance of the tapered thread sleeve.

[0012] Preferably, the elastic slit block is bonded to the bearing base with adhesive to form a complete bearing structure.

[0013] Compared with the prior art, the advantages of the present invention are as follows:

[0014] 1. This invention overcomes the difficulty of high precision requirements in the machining of traditional slit-type hydrostatic bearings. By introducing the use of tapered threads, even wide slits can achieve good throttling effects through adjustment, thereby greatly reducing the machining difficulty and cost of the slits.

[0015] 2. The present invention combines an elastic slit block and a tapered thread sleeve, making it possible to adjust the slit width of the bearing, thereby further improving the stiffness and stability of the bearing under load.

[0016] 3. The elastic slit block introduced in this invention has slits on its lower end face with various shapes and numbers. Reasonably selecting different numbers of shaped slits can improve the bearing capacity and stiffness to a certain extent. Attached Figure Description

[0017] Figure 1 This is an overall structural view of the present invention;

[0018] Figure 2 This is a front view of the present invention;

[0019] Figure 3 for Figure 2 Sectional view of AA;

[0020] Figure 4 This is a schematic diagram showing that the throttling slit is arc-shaped;

[0021] Figure 5 This is a schematic diagram showing that the throttling slit is of the polygonal shape.

[0022] Figure 6 This is a schematic diagram showing that the throttling slit is curved.

[0023] In the diagram: 1. Bearing base; 2. Elastic slit block; 3. Tapered threaded sleeve; 4. Air cavity; 5. Slit; 6. Air inlet; 7. Annular groove. Detailed Implementation

[0024] To enable those skilled in the art to better understand the present invention, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] As shown in the attached figure, the present invention provides a hydrostatic thrust bearing with adjustable slits, comprising a bearing base (1), an elastic slit block (2), and a tapered thread sleeve (3). The elastic slit block (2) is provided with tapered threads on its circumference, and the tapered threads cooperate with the tapered thread sleeve (3). The width of the coarse slits (5) distributed at the bottom of the elastic slit block (2) is adjusted by the tightness between the two, so as to achieve the throttling width, thereby realizing the slit throttling effect of the hydrostatic bearing. Furthermore, the bearing load capacity can be changed by adjusting the width of the throttling slit.

[0026] Furthermore, the bearing base (1) has an air cavity (4) inside. The air cavity can be cylindrical or annular. Air is introduced through the air inlet (6). The air cavity (4) is used to store high-pressure gas and supply gas to the slit (5).

[0027] Furthermore, the elastic slit block (2) is frustum-shaped with a taper of 21.8°. At the same time, the upper end face of the slit block is hollowed out to a certain depth and communicates with the air cavity (4). The elastic slit block (2) is provided with a tapered thread along the circumferential direction. The pitch of the tapered thread is 1 mm and the height is 5 mm.

[0028] Furthermore, the slits (5) distributed at the bottom of the elastic slit block (2) have a width of 0.1-0.2 mm. The slits are evenly and discontinuously distributed along the circumference, and the length without slits is less than 10% of the circumference with slits.

[0029] Furthermore, the slits (5) distributed at the bottom of the elastic slit block (2) can be single circumferential slits, double circumferential slits or multi-circumferential slits, and the shape of the slits can be zigzag slits or arcuate slits.

[0030] Furthermore, when the elastic slit block (2) is tightened by the tapered thread sleeve (3), the width of the slit (5) at its bottom will change, and the width will change differently depending on the degree of tightening, thereby achieving different throttling effects.

[0031] Furthermore, the inner ring of the tapered thread sleeve (3) is provided with an outwardly expanding tapered thread with a pitch of 1 mm and a height of 5 mm, which cooperates with the outer tapered thread of the elastic slit block (2).

[0032] Furthermore, the bearing base (1) has an annular groove at its lower end where it connects with the elastic slit block (2), which is used to allow for the tightening allowance of the tapered thread sleeve (3).

[0033] Furthermore, the elastic slit block (2) and the bearing base (1) are bonded together with glue to form a complete bearing structure.

[0034] Example 1

[0035] As shown in the figure, a slit-adjustable hydrostatic thrust bearing includes a bearing base (1), an elastic slit block (2) with tapered threads on its circumference, and a tapered thread sleeve (3) that mates with the tapered threads. The tapered threads have a taper of 21.8°, a pitch of 1 mm, and a height of 5 mm. Six slit throttling devices (5) are evenly distributed along the circumference at the bottom of the elastic slit block. The slits are arc-shaped, with a width of 0.1 mm and a depth of 0.5-1 mm. The diameter of the slit distribution circle is 40 mm, and the spacing between each slit throttling device is only 0.5-1 mm. The slits can also be distributed in two or more turns. Tightening the tapered thread sleeve causes the width of the coarse slit on the elastic slit block to be compressed and deformed, thereby achieving the slit width that provides the throttling effect, thus realizing the slit throttling effect of the hydrostatic thrust bearing. Simultaneously, within a certain range, changing the tightening force can change the width of the throttling slit, thereby changing the bearing's load-bearing capacity.

[0036] Example 2

[0037] As shown in the figure, a slit-adjustable hydrostatic thrust bearing includes a bearing base (1), an elastic slit block (2) with tapered threads on its circumference, and a tapered thread sleeve (3) that mates with the tapered threads. The tapered threads have a taper of 21.8°, a pitch of 1 mm, and a height of 5 mm. Six slit throttling devices (5) are evenly distributed along the circumference at the bottom of the elastic slit block. The slits are zigzag-shaped, with a width of 0.1 mm, a depth of 0.5-1 mm, and a slit distribution circle diameter of 40 mm. The spacing between each slit throttling device is only 0.5-1 mm. The slits can also be distributed in two or more turns. Tightening the tapered thread sleeve causes the width of the coarse slit on the elastic slit block to be compressed and deformed, thereby achieving the slit width that provides the throttling effect, thus realizing the slit throttling effect of the hydrostatic thrust bearing. Simultaneously, within a certain range, changing the tightening force can change the width of the throttling slit, thereby changing the bearing's load-bearing capacity.

[0038] Example 3

[0039] As shown in the figure, a slit-adjustable hydrostatic thrust bearing includes a bearing base (1), an elastic slit block (2) with tapered threads on its circumference, and a tapered thread sleeve (3) that mates with the tapered threads. The tapered threads have a taper of 21.8°, a pitch of 1 mm, and a height of 5 mm. Six slit throttling devices (5) are evenly distributed along the circumference at the bottom of the elastic slit block. The slits are curved, with a width of 0.1 mm and a depth of 0.5-1 mm. The diameter of the slit distribution circle is 40 mm, and the spacing between each slit throttling device is only 0.5-1 mm. The slits can also be distributed in two or more turns. Tightening the tapered thread sleeve causes the width of the coarse slit on the elastic slit block to be compressed and deformed, thereby achieving the slit width that provides the throttling effect, thus realizing the slit throttling effect of the hydrostatic thrust bearing. Simultaneously, within a certain range, changing the tightening force can change the width of the throttling slit, thereby changing the bearing's load-bearing capacity.

Claims

1. A slit-adjustable hydrostatic thrust bearing, comprising a bearing base (1), an elastic slit block (2), and a tapered threaded sleeve (3), characterized in that: The elastic slit block (2) is provided with a tapered thread on its circumference. The tapered thread cooperates with the tapered thread sleeve (3). The width of the coarse slit (5) distributed at the bottom of the elastic slit block (2) is adjusted by the tightening degree between the two to achieve the throttling width, thereby realizing the slit throttling effect of the hydrostatic bearing and changing the bearing capacity. The bearing base (1) has an annular groove (7) at the lower end where it connects with the elastic slit block (2) to allow for the tightening margin of the tapered thread sleeve (3). The bearing base (1) has an air chamber (4) inside. The air chamber is cylindrical or annular and is filled with air through the air inlet (6). The air chamber (4) is used to store high-pressure gas and supply gas to the slit (5).

2. The slit-adjustable hydrostatic thrust bearing as described in claim 1, characterized in that, The elastic slit block (2) is frustum-shaped with a taper of 21.8°. The upper end face of the slit block is hollowed out to a certain depth and connected to the air cavity (4). The elastic slit block (2) is provided with a tapered thread along the circumferential direction. The pitch of the tapered thread is 1 mm and the height is 5 mm.

3. The slit-adjustable hydrostatic thrust bearing as described in claim 1, characterized in that, The elastic slit block (2) has slits (5) distributed at the bottom with a width of 0.1-0.2 mm. The slits are evenly and discontinuously distributed along the circumference, and the length of the slit without opening is less than 10% of the circumference of the slit.

4. The slit-adjustable hydrostatic thrust bearing as described in claim 1, characterized in that, The slits (5) distributed at the bottom of the elastic slit block (2) are single circumferential slits or multi-circumferential slits, and the slit shapes are zigzag slits or curved slits.

5. The slit-adjustable hydrostatic thrust bearing as described in claim 1, characterized in that, The inner ring of the tapered thread sleeve (3) is provided with an outwardly expanding tapered thread with a pitch of 1 mm and a height of 5 mm, which is matched with the outer tapered thread of the elastic slit block (2).

6. The slit-adjustable hydrostatic thrust bearing as described in claim 1, characterized in that, The elastic slit block (2) and the bearing base (1) are bonded together with glue to form a complete bearing.

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