JP2002181040A - Pre-load adjusting mechanism for rolling bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pre-load adjusting mechanism for a bearing used to adjust an axial force applied on the rolling bearing and allowing a user to adjust an axial force applied on the bearing in accordance with a rotation speed of a main shaft. SOLUTION: The pre-load adjusting mechanism for the bearing used to adjust an axial force applied on the rolling bearing is provided. This pre-load adjusting mechanism has a first fixed member 5, an adjusting device 1 provided for the first fixed member 5 and allowing the user to apply a torque, and a first face 2 connected with the adjusting device 1, is provided with an annular plate 6 moving in accordance with a torque from the adjusting device 1 and a first end part connected with a second face 12 of the annular plate 6, and includes an elastic member applying a pressure to the annular plate 6 to generate the spring and a movable annular element 3 connected with a second end part of the elastic member to transmit the spring and generate an axial force in the bearing 4 in accordance with the movement of the annular plate 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a preload adjusting mechanism used for adjusting an axial force applied to a rolling bearing.

[0002]

BACKGROUND OF THE INVENTION Rolling bearings (hereinafter "bearings") are widely used in machine tools, turbines, pumps and the like because of their low cost, low friction, high stiffness and their high performance supporting a combination of radiation and thrust pressure. Widely used in rotating machines and systems.

It is necessary to apply an axial force to the bearing in order to reduce the clearance (gap) between the rotating element and the race and increase the rigidity. Axial force is also called preload.
However, a large preload puts too much pressure on the bearings, adversely affects the service life of the bearing, raises the temperature and wastes energy. On the other hand, a low preload causes a large vibration, causing a sliding phenomenon between the rotating element and the orbit, which causes poor rotation of the main shaft. Therefore, an appropriate preload is required to reduce friction, suppress heat generation, avoid energy consumption, and smoothly rotate the main shaft.

[0004] Normally, a preload is applied to a bearing by a fixed-displacement method or a fixed-pressure method (fi
xed-load method) is used. In the case of a constant volume preload, the volume between the outer race and the inner race is created in the axial direction. This method is not suitable for high-speed rotary bearings. This is because a large pressure is applied to the bearing due to thermal expansion, and the temperature may rise and the bearing may stop rotating. The constant pressure preload method uses a spring to apply an axial force to a bearing. The pressure applied to the bearing in the axial direction does not increase with temperature, since the spring can absorb the bearing displacement due to temperature rise. Therefore,
The constant pressure preload method is applied to the high speed rotating spindle.

To obtain high productivity and high quality, modern high performance spindles are generally operated over a wide speed range. Therefore, there is a need for an adjustable preload mechanism that can apply an appropriate preload so as to be compatible with different rotational speeds.
Examples of preload adjustment structures utilizing hydrostatic bearings are disclosed in Taiwanese Patent No. 112785 and U.S. Pat. No. 4,551,032. The structure of this embodiment is complex and requires multiple tubes for oil transport. Further, a preload adjusting structure using a shape memory alloy is disclosed in Taiwan Patent No. 173365 and US Patent No. 509455.
No. 1. In these embodiments, deformation of the shape memory alloy at different temperatures is used, and the preload applied to the bearing is adjustable. However, shape memory alloys are very expensive and have many problems. Therefore, development of a preload adjusting mechanism that solves the problems faced by the prior art has been desired.

[0006]

SUMMARY OF THE INVENTION One object of the present invention is to provide a preload adjusting mechanism for a bearing used for adjusting an axial force applied to a rolling bearing.

Another object of the present invention is to provide a preload adjusting mechanism for a bearing that allows a user to adjust the axial force applied to the bearing according to the rotational speed of a spindle. As a result, the manufacturing cost of the main shaft is greatly reduced, and the service life of the bearing is extended.

[0008]

According to the present invention, a preload adjusting mechanism is provided in a first fixing member, the first fixing member,
An adjuster for applying torque to the user, an annular plate for moving in accordance with the torque from the adjuster, a first plate connected to the second surface of the annular plate, An elastic member having an end portion for applying pressure to the annular plate to apply elasticity; and an elastic member connected to a second end of the elastic member for applying axial force to the bearing in response to movement of the annular plate. A movable annular element for transmitting the

According to one feature of the invention, the regulator comprises:
A screw bolt having a thread groove, provided in the first fixing member, for engaging with a corresponding screw groove provided in the first fixing member; a handle connected to one end of the screw bolt for rotating the screw bolt; Contains. Preferably, the handle is provided integrally with one end of the screw bolt. further,
The other end of the screw bolt is connected to the first surface of the annular plate.

According to another feature of the invention, the screw bolt moves in the direction of the annular plate when the handle is first rotated in one direction and moves away from the annular plate when the handle is subsequently rotated in the opposite direction. Of course, the force on the annular plate increases in the first case and decreases in the next case.

According to yet another feature of the invention, a first end of the elastic member is restricted by a second surface of the annular plate, and a second end of the elastic member is provided within the movable annular element. It is regulated by a wall and generates elasticity to apply axial force to the bearing. Preferably, the elastic member is a spring.

In accordance with yet another feature of the invention, the annular plate compresses the spring when the regulator applies pressure to the annular plate to create resiliency.

According to another feature of the invention, the preload adjustment mechanism further includes an outer securing member and an inner securing member,
An annular plate and a movable annular element are fixed.

According to yet another feature of the invention, a movable annular element is provided between the outer stationary member and the bearing.

According to yet another feature of the invention, an annular plate is provided between the outer and inner securing members. A groove is formed on the inner edge of the outer fixing member,
It restricts the annular plate from moving linearly.

According to yet another feature of the invention, the preload adjustment mechanism further includes a plurality of regulators and a plurality of corresponding springs.

The invention will be better understood from reading the following description with reference to the accompanying drawings, in which:

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a preferred embodiment of a bearing preload adjusting mechanism according to the present invention. This preload adjusting mechanism for the bearing adjusts the axial force applied to the bearing. As shown in FIG. 1, this preload adjusting mechanism for the bearing includes an adjuster 1 provided in the first fixing member 5, and allows a user to apply a torque. The adjuster 1 includes a handle 101 and a screw bolt 102. The screw bolt 102 has a thread (not shown) and is mounted in the first fixing member 5 to engage with a corresponding thread (not shown) provided in the first fixing member 5. . The handle 101 is connected to one end of the screw bolt 102, and rotates the screw bolt 102. Preferably, handle 101 is threaded bolt 10
Two ends are provided integrally. Further, the other end of the screw bolt 102 is connected to the first surface 2 of the annular plate 6.

The annular plate 6 is connected to the adjuster 1 and moves according to the torque from the adjuster 1. The screw bolt 102 moves toward the annular plate 6 when the handle 101 is rotated in one direction, and moves away from the annular plate 6 when the handle 101 is rotated in the opposite direction. The force on the annular plate 6 increases in the former case and decreases in the latter case.

Further, the first end of the spring 8 is regulated by the second surface 12 of the annular plate 6, and the second end of the spring 8
The end is bounded by a wall 11 provided in the movable annular element 3. When the adjuster 1 applies a force to the annular plate 6, the annular plate 6 compresses the spring 8 to generate elasticity, and the movable annular element 3 responds to the movement of the annular plate 6.
To generate an axial force on the outer ring of the bearing 4. Therefore, by adjusting the adjuster 1, the user can adjust the force of the bearing in the axial direction.

Further, the outer fixing member 7 and the inner fixing member 9
Are provided to hold the annular plate 6 and the movable annular element 3 together. The movable annular element 3 shown in FIG.
And the outer ring of the bearing 4. The annular plate 6 is provided between the outer fixing member 7 and the inner fixing member 9. FIG. 2 shows a sectional view of a preload adjusting mechanism according to the present invention. As shown in FIG.
A groove is formed in the inner edge portion of the annular plate 6 to restrict the annular plate 6 from moving linearly in response to the force from the adjuster 1.

The preload adjusting mechanism can also have two symmetrical adjusters or a plurality of symmetrical adjusters and a plurality of corresponding springs. In addition, the annular plate 6 is not limited to the shape shown in FIG.

Those skilled in the art will be able to modify or modify these embodiments without departing from the spirit and scope of the present invention. Such improvements and changes are intended to be covered by the appended claims.

[0024]

The preload adjusting mechanism for a bearing described according to the accompanying drawings overcomes the disadvantages of the prior art. Further, the preload adjusting mechanism of the present invention has an excellent effect that the operation is easy with a simple structure, the manufacturing cost is reduced, and the life of the bearing is extended.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a preferred embodiment of a bearing preload adjusting mechanism of the present invention.

FIG. 2 is a cross-sectional view of the preload adjusting mechanism along the line AA in FIG.

DESCRIPTION OF SYMBOLS 1 Regulator 2 First surface of annular plate 3 Movable annular element 4 Bearing 5 First fixing member 6 Annular plate 7 Outer fixing member 8 Spring 9 Inner fixing member 11 Wall 12 Second surface of annular plate 101 Handle 102 Screw Bolt

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Liu De Singh Taiwan 621 Chai Min Shun Shan Sang Shin Twen No. 160 F-term (reference) 3J012 AB04 BB03 CB01 CB03 FB10

Claims (7)

[Claims] 1. A preload adjusting mechanism for a rolling bearing, comprising:
A first fixing member, and an adjuster provided in the first fixing member for applying a torque to a user, the adjuster being provided in the first fixing member. An adjuster having a screw bolt, a handle connected to one end of the screw bolt and rotating the screw bolt, and a first surface connected to the adjuster, corresponding to the torque from the adjuster. An annular plate that moves; and a first end connected to a second surface of the annular plate;
An elastic member configured to generate elasticity by applying pressure to the annular plate; connected to a second end of the elastic member; transmitting the elasticity in response to the movement of the annular plate; A preload adjusting mechanism, comprising: a movable annular element generated in a bearing. 2. The screw bolt has a thread groove, and the
The handle is integrally formed with one end of the screw bolt, the other end of the screw bolt being mounted in the fixing member and engaging with a corresponding screw groove provided in the first fixing member. 2. The preload adjusting mechanism according to claim 1, wherein the preload adjusting mechanism is connected to the first surface of the plate. 3. The screw bolt moves in the direction of the annular plate when the handle is rotated in one direction, and moves away from the annular plate when the handle is rotated in the opposite direction.
3. The preload adjusting mechanism according to claim 2, wherein the force applied to the annular plate increases in the former case and decreases in the latter case. 4. A first end of the elastic member is restricted by a second surface of the annular plate, and a second end of the elastic member is restricted by a wall provided in the movable annular element to generate elasticity. 2. The method of claim 1, wherein the resilient member is a spring for providing an axial force to the bearing, and the annular plate compresses the spring to generate elasticity when a regulator applies a force to the annular plate.
The described preload adjustment mechanism. 5. The method according to claim 1, further comprising an outer fixing member and an inner fixing member, wherein the annular plate and the movable annular element are fixedly provided, the movable annular element being provided between the outer fixing member and a bearing, the annular member being provided. The preload adjusting mechanism according to claim 1, wherein a plate is provided between the outer fixing member and the inner fixing member. 6. The preload adjusting mechanism according to claim 5, wherein a groove is provided on an inner edge of the outer fixing member to move the annular plate in a desired direction. 7. The preload adjusting mechanism according to claim 1, further comprising a plurality of adjusters and a plurality of corresponding elastic members.