CN210937988U

CN210937988U - Miniature bearing press-fitting device

Info

Publication number: CN210937988U
Application number: CN201921932357.8U
Authority: CN
Inventors: 黄振; 张鑫杰
Original assignee: Changzhou Dongfeng Bearing Co ltd
Current assignee: Changzhou Dongfeng Bearing Co ltd
Priority date: 2019-11-11
Filing date: 2019-11-11
Publication date: 2020-07-07
Anticipated expiration: 2029-11-11

Abstract

The utility model relates to a miniature bearing pressure equipment device, pressure equipment device include main shaft, pressure head, bearing frame and power-displacement sensor. The main shaft is connected with the pressure head in a sealing mode and used for feeding a rotating shaft of the miniature bearing, the bearing seat is used for press-mounting and positioning the miniature bearing, and the force-displacement sensor is used for detecting stress and displacement in the press-mounting process of the rotating shaft and the miniature bearing. The main shaft is arranged on a press machine and connected with a vacuum pump, the vacuum pump is used for generating negative pressure to adsorb rotating shaft feeding, the miniature bearing is placed in a bearing seat, the rotating shaft is accurately pressed into the miniature bearing through the manual operation of the press machine, and an operator manually carries out discharging on the rotating shaft and the miniature bearing finished product after installation. The miniature bearing press-fitting device is simple and convenient to operate, high in assembly precision and wide in applicability, and can be used for accurately mounting miniature bearings of various size series.

Description

Miniature bearing press-fitting device

Technical Field

The utility model relates to a bearing pressure equipment mechanical device especially relates to a miniature bearing pressure equipment device.

Background

The miniature bearing is a metric series bearing with an outer diameter smaller than 9mm or an English series bearing with an outer diameter smaller than 9.525mm, and is mainly made of carbon steel, bearing steel, stainless steel, plastics, ceramics and the like. At present, the smallest commercial steel ball bearing in the world can be manufactured to have the outer diameter of 1.5mm, the inner diameter of 0.5mm and the diameter of a steel ball of 0.25 mm. The micro bearing is mainly suitable for the fields of high rotating speed and low noise of various industrial equipment, small-sized rotary motors and the like, such as: office appliances, micro motors, instruments, small clocks, dental drills, hard disk motors, toy models and the like. Because the overall dimension of miniature bearing is less, the precision is higher, therefore its installation degree of difficulty is great. If the micro bearing is not installed correctly, on one hand, the precision and the stability of the bearing transmission can be directly influenced, and on the other hand, the parts in the bearing can be indented or cracked, so that the bearing can rapidly fail in operation.

SUMMERY OF THE UTILITY MODEL

Utility model purpose: the utility model aims to solve the technical problem that a miniature bearing pressure equipment device is provided, this miniature bearing pressure equipment device easy and simple to handle, assembly precision is high, extensive applicability is general, can be used to each size series miniature bearing's accurate installation.

In order to achieve the above object, the utility model adopts the following technical scheme:

a miniature bearing press-mounting device comprises a main shaft, a pressure head, a bearing seat and a force-displacement sensor, wherein the main shaft, the pressure head and the bearing seat are positioned on the same axis; the force-displacement sensor is fixedly connected above the main shaft and used for measuring the stress and displacement of the rotating shaft in the process of pressing the rotating shaft into the miniature bearing in real time, a slotted hole is vertically formed in the bottom of the main shaft upwards and used for installing a pressure head and serving as a vacuum cavity, the slotted hole in the upper part of the pressure head forms the vacuum cavity, air holes communicated with the vacuum cavity are formed in the vacuum cavity, and the air holes penetrate through the main shaft; the pressure head is provided with a feeding hole and a shaft shoulder; the outer side of the feeding hole is in threaded connection with a slotted hole of the main shaft, and the shaft shoulder is tightly pressed on the bottom end face of the main shaft and used for assisting the sealing of the main shaft and the pressure head; the bearing seat is provided with a positioning hole for placing the miniature bearing, and a groove is arranged below the positioning hole.

Preferably, the main shaft and the pressure head are connected through a bolt, and the contact surface of the main shaft and the pressure head has sealing performance.

Preferably, the diameter of the feeding hole is larger than the diameter of the end face of the rotating shaft and smaller than the diameter of the shaft shoulder of the rotating shaft.

Preferably, the positioning hole is in large clearance fit with the outer ring of the micro bearing, and the diameter of the groove is between the inner diameter of the inner ring of the micro bearing and the outer diameter of the inner ring.

Preferably, a ball body and a spring are further arranged in the bearing seat, a plurality of wall holes are formed in the peripheral inner wall of the positioning hole, the ball body and the spring are arranged in the wall holes, the ball body is located at one end of the positioning hole in the direction, and the ball body is connected and installed in the wall holes through the spring.

Preferably, the number of the balls, the springs and the wall holes is multiples of 3, the balls and the springs are circumferentially arranged on the inner wall surface of the positioning hole, and the balls and the springs can stretch and retract along the axial direction of the wall holes and are used for accurately positioning the outer ring of the micro bearing.

The use process of the device is as follows:

1. mounting a main shaft on a manual press, and connecting an air hole in the main shaft with a vacuum pump;

2. starting a vacuum pump to enable the vacuum cavity to generate negative pressure and adsorb one end of the micro bearing rotating shaft to enter a feeding hole of the pressure head, wherein the shaft shoulder end face of the rotating shaft is tightly attached to the shaft shoulder end face of the pressure head;

3. placing the miniature bearing in the positioning hole, and compressing the ball body and the spring by the outer ring of the miniature bearing to realize accurate positioning;

4. the press machine is manually operated to enable the spindle to drive the rotating shaft to move downwards and press the rotating shaft into the inner ring of the miniature bearing, at the moment, the force-displacement sensor measures the contact stress and displacement of the rotating shaft in the process of pressing the rotating shaft into the miniature bearing in real time, and outputs a force-displacement curve for identifying the press-fitting effect;

5. after the miniature bearing is installed, the rotating shaft and the miniature bearing finished product are still adsorbed in the feeding hole due to the negative pressure in the vacuum cavity, at the moment, the finished product is pulled out of the positioning hole by the manual operation press, the main shaft returns to the initial position, and the operator manually pulls out the finished product for blanking.

Has the advantages that: the utility model provides a miniature bearing pressure equipment device compares prior art, has following beneficial effect:

the utility model provides a miniature bearing pressure equipment device utilizes vacuum adsorption's mode to carry out quick material loading to the pivot, and miniature bearing carries out the accurate positioning through the bearing frame, and the assembly of pivot and miniature bearing is accomplished through manual press, and bearing assembly precision is then ensured by power-displacement sensor. Because the appearance size of the rotating shaft and the miniature bearing is small, and the miniature bearing is thin in wall and low in rigidity, the deformation and the failure of the inner ring and the outer ring of the miniature bearing can be caused by overlarge press-fitting force generated in the assembling process. In addition, if the rotating shaft is not installed in the micro bearing in place, the later working stability of the bearing is also affected. At present, although some auxiliary mounting devices for micro bearings are reported, the auxiliary devices only ensure the convenient mounting of the micro bearings, the problems of stress and displacement during the mounting of the micro bearings are not considered, and the precise positioning of the micro bearings is also a key problem to be solved due to the small size of the micro bearings. In addition, the wall contact stress and the relative displacement of the micro bearing and the rotating shaft during installation have great influence on the later service life of the bearing. Therefore, adopt the utility model provides a pressure equipment device can ensure miniature bearing's high efficiency, accurate assembly, utilizes mechanical structure such as locating hole, wall spheroid, spring in the bearing frame to realize miniature bearing's accurate positioning. Because the ball body and the spring can move in a telescopic way, when the rotating shaft is pressed into the miniature bearing, the miniature bearing can realize micro-floating adjustment in the horizontal direction, and the effect of accurate centering is achieved. In addition, a force-displacement sensor in the press mounting device can monitor the press mounting stress and displacement of the bearing in real time, ensure that the bearing implements a key link of precise and accurate installation, and ensure that the parts of the bearing are not damaged in the press mounting process and the service life of the bearing is not influenced. The press mounting device is high in assembly precision and wide in applicability, and can be used for accurately mounting miniature bearings of various size series.

Drawings

FIG. 1 is a cross-sectional view of a micro-bearing press-fitting device;

FIG. 2 is a schematic view of a shaft pressed into a micro-bearing;

FIG. 3 is a schematic view of the blanking of the spindle and the finished micro bearing.

The device comprises a main shaft 1, a pressure head 2, a bearing seat 3, a vacuum cavity 4, an air hole 5, a feeding hole 6, a shaft shoulder 7, a positioning hole 8, a groove 9, a rotating shaft 10, a micro bearing 11, a force-displacement sensor 12, a ball 13, a spring 14 and a wall hole 15.

Detailed Description

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are presented herein only to illustrate and explain the present invention, and not to limit the present invention.

Example (b):

a miniature bearing press mounting device is used for mounting a miniature deep groove ball bearing with standard size and a rotating shaft thereof, and the main size parameters of the bearing and the rotating shaft are as follows:

bearing: the outer diameter of the outer ring is 5mm, the inner diameter of the outer ring is 4mm, the outer diameter of the inner ring is 2.9mm, the inner diameter of the inner ring is 2mm, and the width is 1.5 mm;

rotating shaft: the diameter of the end face is 2mm, the length of the end inserted into the bearing is 2.5mm, and the diameter of the shaft shoulder is 2.7 mm.

The structure of the press mounting device is shown in figure 1, and the press mounting device comprises a main shaft 1, a pressure head 2, a bearing seat 3 and a force-displacement sensor 12. Wherein, main shaft 1, pressure head 2 and bearing frame 3 are installed on the same axis. The force-displacement sensor 12 is fixedly connected above the main shaft 1 and used for measuring the stress and displacement of the rotating shaft 10 in the process of pressing the rotating shaft into the miniature bearing 11 in real time, a slotted hole is vertically formed in the bottom of the main shaft 1 upwards and used for installing the pressure head 2 and serving as a vacuum cavity 4, the slotted hole in the upper part of the pressure head 2 forms the vacuum cavity 4, an air hole 5 communicated with the vacuum cavity 4 is formed in the vacuum cavity 4, and the air hole 5 penetrates through the main shaft 1; the pressure head 2 is provided with a feeding hole 6 and a shaft shoulder 7; the outer side of the feeding hole 6 and the slotted hole of the main shaft 1 form a thread, the diameter of the feeding hole 6 is 2.3mm, and a shaft shoulder 7 is tightly pressed on the end face of the main shaft 1 and used for assisting the sealing of the main shaft 1 and the pressure head 2. A positioning hole 8 and a groove 9 are designed on the bearing seat 3; a plurality of wall holes 15 are formed in the peripheral inner wall of the positioning hole 8, a ball body 13 and a spring 14 are arranged in each wall hole 15, and the ball body 13 is located at one end of the positioning hole 8 in the direction and is connected and installed in the wall holes 15 through the spring 14. The nominal diameter of the positioning hole 8 is 5mm, and the fit clearance with the outer ring of the miniature bearing 11 is 0.22 mm. The diameter of the groove 9 is 2.5mm and the depth is 4 mm. The sphere 13, the spring 14 and the wall hole 15 are provided in three groups and are uniformly arranged along the inner wall surface of the positioning hole 8 in the circumferential direction.

A main shaft 1 of the press-fitting device is arranged on a manual press, and an air hole 5 is connected with a vacuum pump through an air pipe. And starting a vacuum pump to enable the vacuum cavity 4 to generate negative pressure, adjusting the vacuum pressure value to enable the rotating shaft 10 to be adsorbed into the feeding hole 6, and enabling the shaft shoulder end face of the rotating shaft 10 to be tightly attached to the shaft shoulder 7 end face. The micro bearing 11 is placed in the positioning hole 8, and the ball 13 is pressed on the outer ring of the micro bearing 11 by the elasticity of the spring 14, so that accurate positioning is realized.

As shown in fig. 2 and 3, the press is manually operated to make the spindle 1 drive the rotating shaft 10 to move downwards and press into the inner ring of the micro deep groove ball bearing 11. When the rotating shaft 10 contacts the surface of the miniature bearing 11, the force-displacement sensor 12 starts to measure the stress and displacement in the process of pressing the rotating shaft 10 into the miniature bearing 11 in real time, and outputs a force-displacement curve for identifying the press-fitting effect. If the press-in stress or displacement is out of tolerance, the device immediately gives an alarm to remind an operator of immediately finding the installation defect. After the micro bearing 11 is installed, the press is manually operated to return the spindle 1 to the original position. At this time, the micro bearing 11 and the finished rotating shaft 10 are still adsorbed in the feeding hole 6 due to the negative pressure of the vacuum chamber 4. Therefore, the micro bearing 11 and the finished shaft 10 can move together with the spindle 1 and be pulled out of the positioning hole 8. And finally, manually grabbing and blanking the finished product by an operator.

The above description is only a preferred embodiment of the present invention, and it should be noted that: for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be considered as the protection scope of the present invention.

Claims

1. The utility model provides a miniature bearing pressure equipment device which characterized in that: the device comprises a main shaft (1), a pressure head (2), a bearing seat (3) and a force-displacement sensor (12), wherein the main shaft (1), the pressure head (2) and the bearing seat (3) are positioned on the same axis; the force-displacement sensor (12) is fixedly connected above the main shaft (1) and used for measuring stress and displacement of the rotating shaft (10) in the process of pressing the rotating shaft into the miniature bearing (11) in real time, a slotted hole is vertically formed in the bottom of the main shaft (1) upwards and used for mounting the pressure head (2) and serving as the vacuum cavity (4), the slotted hole in the upper part of the pressure head (2) forms the vacuum cavity (4), air holes (5) communicated with the vacuum cavity (4) are formed in the vacuum cavity (4), and the air holes (5) penetrate through the main shaft (1); the pressure head (2) is provided with a feeding hole (6) and a shaft shoulder (7); the outer side of the feeding hole (6) is in threaded connection with a slotted hole of the main shaft (1), and the shaft shoulder (7) is tightly pressed on the bottom end face of the main shaft (1) and used for assisting the sealing of the main shaft (1) and the pressure head (2); the bearing seat (3) is provided with a positioning hole (8) for placing a miniature bearing (11), and a groove (9) is arranged below the positioning hole (8).

2. A miniature bearing press fitting device as set forth in claim 1, wherein: the main shaft (1) is connected with the pressure head (2) through a bolt, and the contact surface of the main shaft (1) and the pressure head (2) has sealing performance.

3. A miniature bearing press fitting device as set forth in claim 1, wherein: the diameter of the feeding hole (6) is larger than the diameter of the end face of the rotating shaft (10) and smaller than the diameter of a shaft shoulder of the rotating shaft (10).

4. A miniature bearing press fitting device as set forth in claim 1, wherein: the positioning hole (8) is in large clearance fit with the outer ring of the miniature bearing (11), and the diameter of the groove (9) is between the inner diameter of the inner ring of the miniature bearing (11) and the outer diameter of the inner ring.

5. A miniature bearing press fitting device as set forth in claim 1, wherein: still set up spheroid (13) and spring (14) in bearing frame (3), a plurality of wall holes (15) are seted up to the inner wall all around of locating hole (8), all set up spheroid (13) and spring (14) in wall hole (15), spheroid (13) are located locating hole (8) direction one end, connect through spring (14) and install in wall hole (15).

6. A miniature bearing press fitting device according to claim 5, wherein: the number of the balls (13), the springs (14) and the wall holes (15) is multiples of 3, the balls (13), the springs (14) and the wall holes (15) are circumferentially arranged on the inner wall surface of the positioning hole (8), and the balls (13) and the springs (14) can stretch in the axial direction of the wall holes (15) and are used for accurately positioning the outer ring of the miniature bearing (11).