CN211951214U

CN211951214U - Sealing structure of machine tool driving assembly

Info

Publication number: CN211951214U
Application number: CN202020277184.7U
Authority: CN
Inventors: 张赤成; 李三
Original assignee: Neway Cnc Equipment Suzhou Co ltd
Current assignee: Neway Cnc Equipment Suzhou Co ltd
Priority date: 2020-03-09
Filing date: 2020-03-09
Publication date: 2020-11-17
Anticipated expiration: 2030-03-09

Abstract

The utility model discloses a lathe drive assembly seal structure, including the lead screw, the spacer, bearing and bearing frame, the lead screw is located to spacer and bearing frame, the bearing frame is equipped with the mounting hole and locates spacer and bearing outside through the mounting hole cover, the terminal flange that forms of mounting hole, the bearing frame outward flange forms annular bulge, form the slot between annular bulge and the flange, the spacer is equipped with labyrinth structure, labyrinth structure includes the retaining ring, form the mounting groove between the main part of retaining ring and spacer, the flange is located the mounting groove, the retaining ring is arranged in making spacer tip and bearing frame tip buckle in the slot, form the air gap between retaining ring outer wall and the annular bulge inner wall, when the lead screw rotates, annular bulge department can form annular air pocket, spill into the maze when impurity, impurity flows from annular opening part under the effect of dead weight and rotatory air current along the slot.

Description

Sealing structure of machine tool driving assembly

Technical Field

The utility model relates to a lathe especially relates to a lathe drive assembly seal structure.

Background

The bearing in the driving part of the machine tool is an important precision part, and is particularly important for sealing the running environment of the bearing, and the quality of the bearing directly influences the precision of the whole machined workpiece of the machine tool. During the machining process of the machine tool, a large amount of cutting fluid, cutting scraps and lubricating oil for lubricating the screw rod splash, so that the operating environment of a driving part is relatively severe. Original drive disk assembly structure bearing has a straight line gap with the external world, and this gap has cavitation when the high-speed operation of lead screw, and external impurity such as oil, water, bits will directly enter into drive disk assembly through this gap inside, can cause the bearing to rust, abnormal sound, card die, from leading to the unable normal operating of drive disk assembly, influence machining precision and machining efficiency, the lathe also can produce great noise at the operation in-process.

As shown in fig. 1, the conventional machine tool driving unit has an annular straight gap between the nut 20 and the spacer 30, and has no sealing structure. When the screw rod 10 is driven by the motor to rotate at a high speed, external impurities can directly enter the bearing seat 40 and enter the raceway of the bearing 50. When the bearing 50 with impurities runs at a high speed, the temperature of the bearing 50 rises due to the rapid friction between the impurities and the steel balls and the inner and outer rings of the bearing 50, the running precision of the bearing 50 is reduced due to the uneven inner and outer temperatures, and the bearing 50 is blocked and runs abnormal sound due to the damage of the steel balls and the inner and outer ring raceways in the bearing 50 caused by the friction, so that the transmission precision of a driving part is reduced.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model aims to provide a sealing structure which can prevent impurities from entering the interior of a machine tool driving component.

The purpose of the utility model is realized by adopting the following technical scheme:

the utility model provides a lathe drive assembly seal structure, includes lead screw, spacer, bearing and bearing frame, the spacer reaches the bearing frame is located the lead screw, the bearing frame is equipped with the mounting hole and passes through the mounting hole cover is located the spacer reaches the bearing is outside, the terminal flange that forms of mounting hole, the bearing frame outward flange forms annular bulge, annular bulge with form the slot between the flange, the spacer is equipped with labyrinth structure, labyrinth structure includes the retaining ring, the retaining ring with form the mounting groove between the main part of spacer, the flange is located in the mounting groove, the retaining ring is located make in the slot the spacer tip with bearing frame tip buckle, the retaining ring outer wall with form the air gap between the protruding inner wall of annular.

Further, the annular protrusion is open.

Further, the annular protrusion is semicircular.

Further, the groove is arc-shaped.

Further, the mounting groove is arc-shaped.

Further, the machine tool driving assembly sealing structure further comprises a sealing cover, and the sealing cover is located at the tail end of the screw rod and fixed to the bearing seat.

Further, the machine tool driving assembly sealing structure further comprises a nut, and the nut is sleeved on the lead screw and abutted against the spacer bush.

Further, the spacer is located between the bearing and the nut.

Compared with the prior art, the utility model discloses a terminal flange that forms of mounting hole of lathe drive assembly seal structure bearing frame, the bearing frame outward flange forms annular bulge, form the slot between annular bulge and the flange, the spacer is equipped with labyrinth structure, labyrinth structure includes the retaining ring, form the mounting groove between the main part of retaining ring and spacer, the flange is located the mounting groove, the retaining ring is arranged in the slot and makes spacer tip and bearing frame tip buckle, form the air gap between retaining ring outer wall and the annular bulge inner wall, when the lead screw rotates, annular bulge department can form annular air pocket, in the maze is gone into in as impurity splash-in, impurity flows from annular opening part under the effect of dead weight and rotatory air current along the slot.

Drawings

FIG. 1 is a prior art machine tool drive assembly configuration;

fig. 2 is a cross-sectional view of the sealing structure of the machine tool driving assembly of the present invention;

FIG. 3 is a perspective cross-sectional view of a bearing housing of the machine drive assembly sealing structure of FIG. 2;

FIG. 4 is a perspective cross-sectional view of a spacer sleeve of the machine drive assembly sealing structure of FIG. 2;

fig. 5 is a schematic view showing a use state of the sealing structure of the machine tool driving assembly of fig. 2.

In the figure: 10. a screw rod; 20. a nut; 50. a bearing; 40. 60, a bearing seat; 61. mounting holes; 62. a flange; 63. an annular projection; 64. a trench; 30. 70, spacer bush; 71. a through hole; 72. a labyrinth structure; 73. a retainer ring; 74. mounting grooves; 80. an air gap; 90. and (7) sealing the cover.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present, secured by intervening elements. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When an element is referred to as being "disposed on" another element, it can be directly disposed on the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 2 to 5, the sealing structure of a driving assembly of a machine tool according to the present invention includes a screw rod 10, a nut 20, a bearing 50, a bearing seat 60, a spacer 70, and a sealing cover 90.

The bearing housing 60 is provided with a mounting hole 61, and a flange 62 is formed at one end of the mounting hole 61. An annular projection 63 is formed on the outer edge of the bearing seat 60, and a groove 64 is formed between the annular projection 63 and the flange 62. The annular projection 63 is open, i.e. there is an opening for impurities to flow out along the groove 64. In the present embodiment, the annular projection 63 is semicircular. The flange 62 is annular.

The spacer 70 is provided with a through hole 71 and a labyrinth structure 72. The labyrinth 72 extends from the wall of the through hole 71 at one end thereof. The labyrinth 72 includes a retaining ring 73 and a mounting groove 74. The retainer ring 73 and the mounting groove 74 are circular. The mounting groove 74 is formed by partially recessing the retainer ring 73 near the through hole 71. The labyrinth 72 is saw-toothed.

When the sealing structure of the driving assembly of the machine tool is assembled, the bearing 50 is sleeved on the screw rod 10, and the bearing seat 60 is sleeved on the bearing 50 and wraps the bearing 50. The sealing cover 90 is fixedly connected with the bearing seat 60 through a fastening screw, on one hand, the impurities at the tail end are prevented from entering the bearing seat 60, on the other hand, air convection cannot be formed when the screw rod 10 rotates at a high speed at two ends, and the problem that dust is brought into the bearing 50 due to the air convection cannot be caused. The spacer 70 is sleeved on the screw rod 10 and abutted against the bearing 50. The retainer ring 73 of the spacer 70 is positioned in the groove 64 of the bearing housing 60 and the flange 62 of the bearing housing 60 is positioned in the mounting groove 74 of the spacer 70. At this time, the end of the spacer 70 is engaged with the end of the bearing seat 60 to form a tooth-shaped labyrinth. An air gap 80 is formed between the retainer ring 73 and the annular projection 63. The nut 20 is sleeved on the screw rod 10 and fixed with the screw rod 10. Spacer 70 is now positioned between bearing 50 and nut 20.

When the machine tool driving assembly is used, the screw rod 10 rotates at a high speed, and as the spacer 70 and the bearing seat 60 are installed in a matching manner to form a labyrinth type sealing structure, impurities splash into a labyrinth, and under the condition that the screw rod 10 runs at a high speed, the impurities flow out from the annular opening along the annular groove 64 under the action of self weight and rotating airflow. Since the gap between the spacer 70 and the bearing seat 60 is designed to be small and to be a mutually buckled ring structure, the external impurities are directly prevented from being directly splashed into the bearing 50. The sealing cover 90 prevents impurities at the end from entering the bearing seat 60, and prevents air convection at the two ends when the screw rod 10 rotates at a high speed, so that dust is not brought into the bearing 50 due to the air convection.

The structure constitutes the sealing structure of the driving part together, so that the damage of the precision bearing 50 and the influence on the transmission precision and the service life of the driving part caused by the external impurities entering the bearing 50 in the processing process are avoided to the maximum extent, and the sealing, the stability and the reliability of the driving part are greatly improved.

Various other modifications and changes may be made by those skilled in the art based on the above-described technical solutions and concepts, and all such modifications and changes are intended to fall within the scope of the claims.

Claims

1. The utility model provides a lathe drive assembly seal structure, includes lead screw, spacer, bearing and bearing frame, the spacer reaches the bearing housing is located the lead screw, the bearing frame is equipped with the mounting hole and passes through the mounting hole cover is located the spacer reaches the bearing is outside, its characterized in that: the mounting hole end forms the flange, the bearing frame outward flange forms annular bulge, annular bulge with form the slot between the flange, the spacer sleeve is equipped with labyrinth structure, labyrinth structure includes the retaining ring, the retaining ring with form the mounting groove between the main part of spacer sleeve, the flange is located in the mounting groove, the retaining ring is located make in the slot the spacer sleeve tip with the bearing frame tip buckle, the retaining ring outer wall with form the air gap between the protruding inner wall of annular.

2. The machine tool drive assembly seal structure according to claim 1, characterized in that: the annular protrusion is open.

3. The machine tool drive assembly seal structure according to claim 2, characterized in that: the annular bulge is semicircular.

4. The machine tool drive assembly seal structure according to claim 1, characterized in that: the groove is arc-shaped.

5. The machine tool drive assembly seal structure according to claim 1, characterized in that: the mounting groove is arc-shaped.

6. The machine tool drive assembly seal structure according to claim 1, characterized in that: the sealing structure of the machine tool driving assembly further comprises a sealing cover, and the sealing cover is located at the tail end of the screw rod and fixed on the bearing seat.

7. The machine tool drive assembly seal structure according to claim 1, characterized in that: the machine tool driving assembly sealing structure further comprises a nut, and the nut is sleeved on the lead screw and abutted against the spacer bush.

8. The machine tool drive assembly seal structure according to claim 7, characterized in that: the spacer bush is located between the bearing and the nut.