CN210548154U

CN210548154U - Main shaft bearing oil pressure pretension structure

Info

Publication number: CN210548154U
Application number: CN201921537678.8U
Authority: CN
Inventors: 何道平
Original assignee: Huizhou Jingyang Technology Co ltd
Current assignee: Huizhou Jingyang Technology Co ltd
Priority date: 2019-09-17
Filing date: 2019-09-17
Publication date: 2020-05-19
Anticipated expiration: 2029-09-17

Abstract

The utility model relates to a main shaft bearing oil pressure pretension structure, including the pivot, set up in a plurality of bearings of pivot, the cover is established and is used for spacing bearing's bearing inner circle in the pivot to keep off the ring, bearing periphery side cover be equipped with bearing installation sleeve, bearing installation sleeve on be provided with first step portion, step portion in be provided with the first runner that supplies the liquid flow, bearing inner circle keep off and be provided with the pretension ring between ring and the first step portion. The utility model discloses first runner and second runner have been laid respectively in bearing installation sleeve and main shaft to through the inside fuel feeding of oil inlet, the oil pressure produces the pretightning force in one side of pretension ring and compresses tightly the bearing inner race, thereby realized adjusting the purpose of inside pretightning force through changing outside fuel feeding pressure, make the main shaft can adjust the size of pretightning force wantonly under different work condition and rotational speed, full play bearing performance, improve equipment's life-span and reliability, manufacturing cost is reduced.

Description

Main shaft bearing oil pressure pretension structure

Technical Field

The utility model relates to an electricity main shaft field, concretely relates to main shaft bearing oil pressure pretension structure.

Background

The high-speed electric spindle is a new technology which integrates a machine tool spindle and a spindle motor into a whole and appears in the field of numerical control machines in recent years. The high-speed main shaft bearing mostly adopts a bearing, the bearing is properly pre-tightened, the rotation precision of the main shaft can be improved, the rigidity of the bearing is improved, the vibration noise is reduced, and the service life is prolonged; the positioning and pre-tightening are commonly used on a bearing at the front end of the main shaft, and the bearing is fixed at a certain specific position on the shaft by selecting a proper inner spacer bush and a proper outer spacer bush; the constant-pressure pre-tightening is mostly applied to a rear bearing of a main shaft, and is a pre-tightening mode for generating proper pressure on an outer ring of a bearing by utilizing a proper elastic compression spring matched with a pre-tightening ring.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model provides a main shaft bearing oil pressure pretension structure.

The utility model discloses a following scheme realizes:

a spindle bearing oil pressure pre-tightening structure comprises a rotating shaft, a plurality of bearings arranged on the rotating shaft, and a bearing inner ring retaining ring sleeved on the rotating shaft and used for limiting the bearings, wherein a bearing installation sleeve is sleeved on the outer peripheral side of each bearing, a first step part is arranged on the inner wall of the bearing installation sleeve, a pre-tightening ring is arranged between the bearing inner ring retaining ring and the first step part, a first flow channel for liquid to flow is arranged in the step part, one end of the first flow channel is communicated with the end face of the bearing installation sleeve, and the other end of the first flow channel is communicated with the position corresponding to the pre-tightening ring; the spindle is sleeved with the spindle, the spindle is provided with a second flow channel, and the second flow channel is communicated with the first flow channel.

Furthermore, the main shaft is provided with an oil inlet, and the oil inlet is connected with the second flow channel.

Furthermore, a first sealing ring for preventing liquid leakage is arranged at the position where the first flow passage is connected with the second flow passage.

Furthermore, a second sealing ring is arranged at the position where the pre-tightening ring is connected with the first step part.

Furthermore, a second step part is arranged on the first step part, and a third sealing ring is arranged at the position where the second step part is connected with the pre-tightening ring.

Furthermore, the first flow channel is L-shaped when viewed from the side.

Further, the bearing is an angular contact bearing.

Contrast prior art, the utility model discloses following beneficial effect has:

the utility model discloses first runner and second runner have been laid respectively in bearing installation sleeve and main shaft, and through the inside fuel feeding of oil inlet, the oil pressure produces the pretightning force in one side of pretension ring and compresses tightly the bearing inner race, thereby realized adjusting the purpose of inside pretightning force through changing outside fuel feeding pressure, make the main shaft can adjust the size of pretightning force wantonly under different work condition and rotational speed, full play bearing performance, improve equipment's life-span and reliability, the regulation and control is simple, staff's work load has been reduced, and the production cost is reduced.

Drawings

Fig. 1 is the utility model provides a pair of main shaft bearing oil pressure pretension structure's cross-sectional view.

Fig. 2 is an enlarged view of a portion a of fig. 1.

The reference numerals are represented as:

1. a rotating shaft; 2. a bearing inner ring retaining ring; 3. a bearing; 4. pre-tightening the ring; 5. a bearing mounting sleeve; 51. a first step portion; 52. a second step portion; 6. a main shaft; 71. a first flow passage; 72. a second flow passage; 81. a first seal ring; 82. a second seal ring; 83. a third seal ring; 10. and an oil inlet.

Detailed Description

To facilitate understanding of the present invention for those skilled in the art, the present invention will be described in further detail with reference to the following detailed description and accompanying drawings.

Referring to fig. 1 to 2, the utility model provides a spindle bearing oil pressure pretension structure, including pivot 1, set up a plurality of bearings 3 in pivot 1, the cover is established and is used for spacing bearing 3's bearing inner race to keep off ring 2 in pivot 1, during concrete implementation, bearing 3 can be angular contact bearing, bearing 3 periphery side cover be equipped with bearing installation sleeve 5, bearing installation sleeve 5 inner wall be provided with first step portion 51, bearing inner race keep off ring 2 and first step portion 51 between be provided with pretension ring 4, step portion 51 in be provided with the first runner 71 that supplies liquid to flow, first runner 71 be "L" type from the side view, and wherein one end of first runner 71 lead to the terminal surface of bearing installation sleeve 5, the other end leads to and tightens ring 4 corresponding position department; the spindle 1 is sleeved with a spindle 6, the spindle 6 is provided with a second flow channel 72, and the second flow channel is communicated with the first flow channel; the main shaft 6 is provided with an oil inlet 10, and the oil inlet 10 is connected with the second flow passage 72. During operation, the oil inlet is externally connected with oil supply equipment, pressure oil flows through the main shaft and the bearing installation sleeve through the flow channel and then reaches the pre-tightening ring, the oil pressure generates a pre-tightening force at the left end of the pre-tightening ring to press the outer ring of the angular contact bearing, and the pre-tightening force is adjusted by adjusting the external oil supply pressure.

A first seal 81 for preventing liquid leakage is provided at a position where the first flow passage 71 and the second flow passage 72 meet. A second seal 82 is provided at a position where the preload ring 4 meets the first step 51. The first stepped portion 51 is provided with a second stepped portion 52, and a third seal 83 is provided at a position where the second stepped portion 52 and the preload ring 4 are in contact with each other.

During specific implementation, the pre-tightening ring is in a step shape, a gap is reserved between a step surface of the pre-tightening ring and the second step portion, an opening is formed between the first step portion and the second step portion, the tail end of the first flow channel is connected with the opening, an oil inlet is externally connected with oil supply equipment, pressure oil flows into the gap from the opening after flowing through the main shaft and the bearing installation sleeve through the second flow channel and the first flow channel, and is in contact with the pre-tightening ring, right pre-tightening force is generated at the left end of the pre-tightening ring by oil pressure, so that the pre-tightening ring is pressed on an outer ring of the angular contact bearing, and adjustment of the pre.

In the description of the present invention, it should be understood that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.

In the description of the present invention, "plurality" or "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "connected" and "fixed" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection, or as an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

While the invention has been described in conjunction with the specific embodiments set forth above, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the foregoing description. Accordingly, it is intended to embrace all such alternatives, modifications, and variations that fall within the scope of the included claims.

Claims

1. The spindle bearing oil pressure pre-tightening structure is characterized by comprising a rotating shaft (1), a plurality of bearings (3) arranged on the rotating shaft (1), a bearing inner ring baffle ring (2) which is sleeved on the rotating shaft (1) and used for limiting the bearings (3), a bearing mounting sleeve (5) is sleeved on the outer peripheral side of each bearing (3), a first step part (51) is arranged on the inner wall of the bearing mounting sleeve (5), a pre-tightening ring (4) is arranged between each bearing inner ring baffle ring (2) and each first step part (51), a first flow channel (71) for liquid to flow is arranged in each step part (51), one end of each first flow channel (71) leads to the end face of each bearing mounting sleeve (5), and the other end of each first flow channel leads to the position corresponding to the pre-tightening ring (4); the spindle (6) is sleeved on the rotating shaft (1), a second flow channel (72) is arranged on the spindle (6), and the second flow channel is communicated with the first flow channel.

2. The main shaft bearing oil pressure pre-tightening structure as claimed in claim 1, wherein the main shaft (6) is provided with an oil inlet (10), and the oil inlet (10) is connected with the second flow passage (72).

3. The oil pressure preloading structure of a main shaft bearing according to claim 1, wherein a first sealing ring (81) for preventing liquid leakage is provided at a position where the first flow passage (71) and the second flow passage (72) are connected.

4. The oil pressure pre-tightening structure of the main shaft bearing is characterized in that a second sealing ring (82) is arranged at the position where the pre-tightening ring (4) is connected with the first step part (51).

5. The main shaft bearing oil pressure pretension structure according to claim 1, characterized in that a second step part (52) is arranged on the first step part (51), and a third sealing ring (83) is arranged at the position where the second step part (52) is connected with the pretension ring (4).

6. The oil pressure preloading structure of a main shaft bearing according to claim 1, wherein the first flow passage (71) is L-shaped as viewed from the side.

7. The oil pressure pre-tightening structure of the main shaft bearing as claimed in claim 1, wherein the bearing (3) is an angular contact bearing.