CN110961958B - A variable diameter bearing fixture - Google Patents

Abstract

The invention discloses a diameter-variable bearing clamp which comprises a clamping mechanism and a rotary driving mechanism, wherein the clamping mechanism comprises a clamping head and a clamping head; the clamping mechanism comprises a base, two clamping pieces oppositely arranged on the base and a clamping driving mechanism; wherein the clamping member comprises a clamping portion at an upper end and a clamping arm at a lower end; the clamping part comprises an upper inner ring clamping part and a lower outer ring clamping part; the clamping driving mechanism comprises a driving piece and a transmission assembly; the transmission assembly comprises a screw rod, a screw rod nut and two connecting rods; one end of the connecting rod is hinged with the screw rod nut, and the other end of the connecting rod is hinged with the clamping arm. The fixture can be suitable for bearings with different specifications and sizes to clamp, and can realize reinforced grinding processing on raceways of a bearing inner ring and a bearing outer ring, so that the working efficiency is improved; the clamp is simple in structural design, effectively saves the manufacturing cost, and does not damage the surface of the bearing in the process of clamping and processing the bearing.

Description

A variable diameter bearing fixture

technical field

The invention relates to a bearing fixture, in particular to a variable diameter bearing fixture.

Background technique

Bearings are widely used in the mechanical field and are an important component in contemporary mechanical equipment. Its main function is to support the mechanical rotating body, reduce the friction coefficient during its movement, and ensure its rotation accuracy. According to the different friction properties of moving elements, bearings can be divided into two categories: rolling bearings and sliding bearings. Among them, the rolling bearing has been standardized and serialized, but compared with the sliding bearing, its radial size, vibration and noise are larger, and the price is also higher. Rolling bearings are generally composed of four parts: outer ring, inner ring, rolling elements and cage. The machining accuracy and surface quality of the bearing directly affect the accuracy of the transmission and the life of the machine. In order to improve its surface quality, metal surface strengthening technology is often used to strengthen and grind the surfaces of the inner raceway of the bearing outer ring and the outer raceway of the bearing inner ring.

At present, the mechanical three-jaw type self-centering manual clamp used in the machinery industry to clamp the bearing workpiece can only process the inner raceway of the outer ring of the bearing. Disadvantages such as deformation. The use of centering fixture to clamp the bearing workpiece can only process the outer raceway of the inner ring of the bearing, and different numbers of washers need to be added when machining the inner ring of the bearing with different diameters, and the thickness of the washer is not necessarily just enough. The tension of the ring will be too large or too small. If it is too large, it will cause damage to the inner surface of the inner ring of the bearing. If it is too small, the tension will not be enough, and there will be a danger of falling during rotation; and the clamping and disassembly of the workpiece are cumbersome. Production efficiency is low. Although the existing electromagnetic centerless fixture can process both the bearing inner ring and the bearing outer ring, the fixture structure is complex and the manufacturing cost is high; in addition, the two support blocks will rub the surface of the bearing during rotation, causing the bearing surface to be damaged. damage.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the above-mentioned problems, and to provide a variable diameter bearing fixture, which can adapt to the clamping of bearings of different sizes, and can realize enhanced grinding of the raceways of the bearing inner ring and the bearing outer ring. , the work efficiency is improved; in addition, the fixture has a simple structure design, effectively saves the manufacturing cost, and does not damage the bearing surface in the process of clamping and processing the bearing.

The object of the present invention is achieved through the following technical solutions:

A variable diameter bearing clamp, comprising a clamping mechanism for clamping a bearing and a rotary driving mechanism for driving the clamping mechanism to rotate; the clamping mechanism comprises a base, two oppositely arranged on the base A clamping member for clamping a bearing and a clamping driving mechanism for driving two of the clamping members to approach or move away from each other; wherein,

The clamping part comprises a clamping part at the upper end and a clamping arm at the lower end; wherein the clamping part comprises an inner ring clamping part at the upper part for clamping the inner ring of the bearing and a lower part for clamping The outer ring clamping part of the bearing outer ring;

The clamping driving mechanism includes a driving member and a transmission assembly arranged between the two clamping members for transmitting the power of the driving member; the transmission assembly includes a driving member passing through the base and being rotatably mounted on the base the screw on the screw rod, the screw nut that cooperates with the screw rod, and two connecting rods arranged opposite the screw nut and the clamping part; one end of the connecting rod is connected to the screw nut The other end is hinged with the clamping arm, and the driving member is connected with the lower end of the screw rod.

The working principle of the above variable diameter bearing fixture is:

When it is necessary to strengthen the grinding process of the outer raceway of the inner ring of the bearing, pass the center of the inner ring of the bearing through the two inner ring clamping parts, and the driving part drives the screw to rotate, thereby driving the screw nut to move along the axis of the screw, driving the The connecting rod moves, and then drives the two clamping parts to move away from each other until the two inner ring clamping parts abut against the inner ring of the bearing to realize the clamping of the inner ring of the bearing; then the clamping mechanism is driven by the rotary drive mechanism along the It rotates at its center, and then drives the rotation of the inner ring of the bearing, and finally realizes the enhanced grinding of the outer raceway of the inner ring of the bearing; The screw rotates in the reverse direction, thereby driving the screw nut to move down along the axis of the screw, driving the connecting rod to move, and then driving the two clamping parts to move closer to each other until the two inner ring clamping parts release the inner ring of the bearing. Ring, complete the processing of the bearing inner ring.

When it is necessary to strengthen the grinding process of the inner raceway of the outer ring of the bearing, place the outer ring of the bearing between the clamping parts of the two outer rings, and the driving part drives the screw to rotate, thereby driving the screw nut to move down along the axis of the screw, driving the The connecting rod moves, and then drives the two clamping parts to move closer to each other until the two outer ring clamping parts abut against the outer ring of the bearing to realize the clamping of the outer ring of the bearing; then the clamping mechanism is driven by the rotary drive mechanism along the It rotates at its center, and then drives the rotation of the outer ring of the bearing, and finally realizes the enhanced grinding of the inner raceway of the outer ring of the bearing; The screw rotates in the opposite direction, thereby driving the screw nut to move along the axis of the screw, driving the connecting rod to move, and then driving the two clamping parts to move closer to each other, until the two outer ring clamping parts release the outside of the bearing. ring to complete the machining of the bearing outer ring.

In a preferred solution of the present invention, the clamping part and the clamping arm are both arc-shaped, and the arc-shaped protrudes outward relative to the screw rod; the inner-ring clamping part is arc-shaped smaller than the arc of the outer ring clamping portion. Through the above mechanism, since the clamping part is set in an arc shape, it is favorable for the clamping part and the bearing to cooperate, and the clamping is more stable during the process of clamping the bearing; the arc of the inner ring clamping part is smaller than that of the outer ring clamping part Arc-shaped radian, when clamping the inner ring bearing, the inner ring clamping part with a small arc can adapt to more specifications of the bearing inner ring, which is beneficial to the inner ring clamping part passing through the inner ring of the bearing to clamp it, and the large The curved outer ring clamping part can increase the clamping area of the bearing outer ring and clamp the bearing outer ring more firmly; the clamping arms are set in an arc shape, which can make the clamping distance between the two clamping arms more stable. Small, so that the clamp can accommodate even smaller size bearings.

Further, the lower end of the inner ring clamping part and the lower end of the outer ring clamping part are both provided with a limiting part, and the limiting part of the inner ring clamping part extends along the clamping direction of the inner ring of the bearing, so The limiting part of the outer ring clamping part extends along the clamping direction of the bearing outer ring. Its function is that, by setting the limit portion, it is more favorable for the positioning of the bearing during the process of clamping the bearing.

Preferably, a guide assembly for guiding the relative movement of the two clamping arms on the base is provided between the base and the clamping arm; the guide assembly includes a chute provided on the base and a sliding block which is arranged on the clamping arm and is matched with the sliding groove. By arranging the guide assembly, the sliding block can move linearly on the chute, so that the clamping piece can move more stably in the process of clamping the bearing or loosening the bearing.

Further, the two ends of the chute are provided with limit blocks, the function of which is to prevent the sliders from leaving the chute during mutual movement.

Further, both the sliding block and the limiting block are arc-shaped, and the arc-shaped protrudes outward relative to the center of the base; this can make the structure more compact.

In a preferred solution of the present invention, the rotational drive mechanism and the power source of the drive member are the same drive motor. The advantage of this arrangement is that the rotation of the clamping mechanism and the clamping of the bearing to the bearing can be realized by using a driving motor, which simplifies the mechanism, makes the structure simpler, greatly reduces the manufacturing cost, reduces the energy consumption, and saves resources.

Preferably, the transmission assembly further comprises a cam arranged on the lower end of the screw rod and a sleeve arranged on the main shaft of the driving motor, and the inside of the sleeve is provided with internal gear teeth that cooperate with the cam. By driving the motor to drive the sleeve to rotate, the inner gear teeth on the sleeve also rotate, thereby driving the cam to rotate, which in turn drives the screw to rotate, and finally realizes the movement of the clamping parts closer to or away from each other, and realizes the clamping and release.

Preferably, the rotation driving mechanism further comprises a rotation transmission assembly for transmitting the power of the driving motor to the base and a control assembly for switching the power source between the screw rod or the base; the rotation transmission assembly It comprises an annular journal sleeved on the sleeve, an outer gear tooth arranged on the outer surface of the sleeve, and a driven gear tooth arranged on the inner surface of the annular journal and cooperating with the outer gear tooth; The annular journal is fixedly connected with the base. By setting the above structure, by driving the motor to drive the sleeve to rotate, the external gear on the sleeve also rotates, thereby driving the driven gear teeth to rotate, and then driving the annular journal to move to realize the rotation of the base, and the clamping mechanism is realized through the rotation of the base. The rotation of the bearing is finally realized to strengthen the grinding process of the bearing; by setting the control assembly, the power source of the screw and the base can be switched back and forth, and a driving motor can drive the clamping mechanism to clamp the bearing and drive the clamping mechanism to rotate. Clamping and machining of bearings.

Preferably, the control assembly includes a drive cylinder disposed at the lower end of the drive motor and used to drive the sleeve to move back and forth along its axis direction; the telescopic part of the drive cylinder is connected to the drive motor. With the above mechanism, the telescopic piece can be driven to move downward by driving the cylinder, and the driving motor can also be driven to move downward, thereby driving the sleeve to move downward along its axis, so that the inner gear teeth on the sleeve are separated from the cam, and the outer gear teeth are separated from the driven gear. The gears are matched to realize the engagement of the driving motor and the rotary transmission assembly, and provide power for the rotation of the clamping mechanism. When the driving cylinder drives the telescopic piece to move upward, the sleeve moves upward, and the outer gear teeth on the sleeve are separated from the driven gear teeth, and the inner gear teeth are separated. The gear teeth cooperate with the cam to realize the connection between the power of the driving motor and the screw rod, and provide the clamping or loosening power for the clamping part; the switching of the power source between the clamping part and the clamping mechanism is realized by driving the cylinder, which improves the Flexibility in bearing clamping and machining.

In a preferred solution of the present invention, the lower end of the base is provided with a fixing sleeve, and the fixing sleeve is sleeved on the upper end of the annular journal and is fixedly connected with the annular journal. By arranging the fixing sleeve, the disassembly and installation of the base and the annular journal are facilitated.

In a preferred solution of the present invention, the base is provided with a through hole, the through hole extends along the moving direction of the clamping members moving away from each other, and the screw rod passes through the through hole and is supported by a bearing The seat is fixed on the base. The provision of through holes greatly reduces the weight of the base, thereby reducing the load on the machine tool.

In a preferred solution of the present invention, the variable diameter bearing fixture further comprises a bearing seat for supporting the annular journal, the bearing seat is fixed on the machine tool, and the annular journal is rotatably mounted on the on the bearing seat. By arranging the bearing seat, the annular journal can run along the circumference and serve to support the annular journal, so that the clamping mechanism can be fixedly installed on the machine tool.

Further, a bearing bush is arranged between the annular journal and the bearing seat, which has the advantage of reducing the friction of the annular journal and improving the service life.

Compared with the prior art, the present invention has the following beneficial effects:

1. In the present invention, the driving member drives the screw to rotate, thereby driving the screw nut to move along the axis of the screw, driving the connecting rod to move, and then driving the two clamping members to move away from or close to each other, so as to realize The clamping and loosening of the bearing can realize the variable diameter clamping of the bearing. The present invention has a simple design and structure, and effectively saves the manufacturing cost.

2. In the present invention, by setting the inner ring clamping part and the outer ring clamping part, the inner ring of the bearing and the outer ring of the bearing can be clamped, and the bearings of different sizes can be clamped, and the inner ring of the bearing can be clamped. The reinforced grinding process with the raceway of the outer ring of the bearing has high clamping flexibility; the movement of the clamping part is driven by the screw nut, so that the clamping bearing is evenly stressed, and the bearing surface will not be damaged in the process of clamping and processing the bearing.

Description of drawings

1-3 are schematic structural diagrams of a first specific embodiment of a variable diameter bearing fixture in the present invention; wherein, FIG. 1 is an exploded view, FIG. 2 is a perspective view, and FIG. 3 is a cross-sectional view.

FIG. 4 is a schematic three-dimensional structure diagram of the clamping member in the present invention.

FIG. 5 is a schematic three-dimensional structure diagram of the transmission assembly in the present invention.

FIG. 6 is a schematic three-dimensional structure diagram of the base in the present invention.

FIG. 7 is a schematic three-dimensional structure diagram of the transmission assembly and the rotary transmission assembly in the present invention.

FIG. 8 is a schematic three-dimensional structure diagram of the sleeve in the present invention.

FIG. 9 is a schematic three-dimensional structure diagram of the annular journal in the present invention.

FIG. 10 is a schematic three-dimensional structure diagram of a base of a second specific embodiment of a variable diameter bearing fixture in the present invention.

11 is a schematic three-dimensional structural diagram of a clamping mechanism of a third specific embodiment of a variable diameter bearing clamp in the present invention.

Detailed ways

In order to make the technical solutions of the present invention well understood by those skilled in the art, the present invention will be further described below with reference to the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

Example 1

1-6, a variable diameter bearing clamp includes a clamping mechanism for clamping the bearing and a rotary driving mechanism for driving the clamping mechanism to rotate; the clamping mechanism includes a base 1, two A clamping member 2 disposed opposite to the base 1 for clamping the bearing and a clamping driving mechanism for driving the two clamping members 2 to approach or move away from each other; wherein, the clamping member 2 includes The clamping part 2-1 at the upper end and the clamping arm 2-2 at the lower end; wherein, the clamping part 2-1 comprises an inner ring clamping part 2-11 at the upper part for clamping the inner ring of the bearing and The outer ring clamping part 2-12 located at the lower part is used to clamp the outer ring of the bearing; the clamping driving mechanism includes a driving member and a driving member arranged between the two clamping members 2 for transmitting the power of the driving member. Transmission assembly; the transmission assembly includes a screw rod 3 that passes through the base 1 and is rotatably mounted on the base 1, a screw rod nut 4 that cooperates with the screw rod 3, and two oppositely arranged on the screw rod A connecting rod 5 between the rod nut 4 and the clamping member 2; one end of the connecting rod 5 is hinged with the screw nut 4, and the other end is hinged with the clamping arm 2-2, and the driving member is hinged with the The lower end of the screw rod 3 is connected.

1-4, the clamping portion 2-1 and the clamping arm 2-2 are both arc-shaped, and the arc-shaped protrudes outward relative to the screw rod 3; the inner ring clamp The arc of the tightening portion 2-11 is smaller than the arc of the outer ring clamping portion 2-12. Through the above-mentioned mechanism, since the clamping part 2-1 is set in an arc shape, it can facilitate the cooperation between the clamping part 2-1 and the bearing, and in the process of clamping the bearing, the clamping is more stable; the inner ring clamping part 2-11 The arc radian is smaller than the 2-12 arc radian of the outer ring clamping part. When clamping the inner ring bearing, the inner ring clamping part 2-11 with a small arc can adapt to more specifications of the bearing inner ring, which is beneficial to the inner ring. The clamping part 2-11 passes through the inner ring of the bearing to clamp it, and the clamping part 2-12 of the outer ring with a large arc can increase the clamping area of the outer ring of the bearing and clamp the outer ring of the bearing more stably; The clamping arms 2-2 are arranged in an arc shape, which can make the clamping distance between the two clamping arms 2-2 smaller, so that the clamp can be adapted to bearings with smaller specifications.

Referring to FIG. 4 , the lower end of the inner ring clamping portion 2-11 and the lower end of the outer ring clamping portion 2-12 are provided with a limiting portion 2-13. The inner ring clamping portion 2-11 has a limiting portion 2-13. The position portion 2-13 extends along the clamping direction of the inner ring of the bearing, and the limiting portion 2-13 of the outer ring clamping portion 2-12 extends along the clamping direction of the outer ring of the bearing. Its function is that, by setting the limiting portion 2-13, it is more favorable for the positioning of the bearing during the process of clamping the bearing.

Referring to FIGS. 1-6 , between the base 1 and the clamping arms 2-2, a guide assembly for guiding the relative movement of the two clamping arms 2-2 on the base 1 is provided; the The guide assembly includes a sliding slot 1-1 arranged on the base 1 and a sliding block 2-3 arranged on the clamping arm 2-2 and matched with the sliding slot 1-1. By arranging the guide assembly, the sliding block 2-3 can move linearly on the chute 1-1, so that the clamping member 2 can move more stably during the process of clamping the bearing or loosening the bearing.

Referring to FIG. 6 , the two ends of the chute 1-1 are provided with limit blocks 6, the function of which is to prevent the sliding block 2-3 from being separated from the chute 1-1 during mutual movement.

Referring to FIGS. 4 and 6 , the sliders 2 - 3 and the limiting block 6 are arc-shaped, and the arc-shaped protrudes outward from the center of the base 1 ; this can make the structure more compact.

Referring to FIGS. 1-3 , the power source of the rotary drive mechanism and the drive member is the same drive motor 7 . The advantage of this arrangement is that the rotation of the clamping mechanism and the clamping of the bearing by the clamping member 2 can be realized by using a driving motor 7, which simplifies the mechanism, makes the structure simpler, greatly reduces the manufacturing cost, and reduces the energy consumption , saving resources.

Referring to FIGS. 1-8 , the transmission assembly further includes a cam 8 arranged at the lower end of the lead screw 3 and a sleeve 9 arranged on the main shaft of the drive motor 7 . The internal gear teeth 9-1 of the cam 8 cooperate with each other. The sleeve 9 is driven to rotate by the driving motor 7, and the inner gear teeth 9-1 on the sleeve 9 also rotate, thereby driving the cam 8 to rotate, which in turn drives the screw 3 to rotate, and finally realizes that the clamping members 2 move closer to or away from each other. movement to realize the clamping and loosening of the bearing.

Referring to FIGS. 1 to 9 , the rotary drive mechanism further includes a rotary transmission assembly that transmits the power of the drive motor 7 to the base 1 and a power source for switching the screw 3 or the base 1 to each other. Control assembly; the rotation transmission assembly includes an annular journal 10 sleeved on the sleeve 9, an outer gear tooth 9-2 arranged on the outer surface of the sleeve 9, and an inner gear arranged on the annular journal 10. The driven gear teeth 10 - 1 on the surface and which cooperate with the outer gear teeth 9 - 2 ; the annular journal 10 is fixedly connected with the base 1 . By arranging the above structure, the drive motor 7 drives the sleeve 9 to rotate, and the external gear on the sleeve 9 also rotates, thereby driving the driven gear teeth 10-1 to rotate, thereby driving the annular journal 10 to move, and realizing the rotation of the base 1, The rotation of the clamping mechanism is realized by the rotation of the base 1, and finally the enhanced grinding of the bearing is realized; by setting the control assembly, the power source of the screw 3 and the base 1 can be switched back and forth, and the clamping mechanism can be driven by a driving motor 7 Clamp the bearing and drive the clamping mechanism to rotate to realize the clamping and processing of the bearing.

1-3 and 7-9, the control assembly includes a drive cylinder 11 disposed at the lower end of the drive motor 7 for driving the sleeve 9 to move back and forth along its axis; the drive The telescopic element 11 - 1 of the air cylinder 11 is connected to the drive motor 7 . With the above-mentioned mechanism, the telescopic element 11-1 can be driven to move downward by the driving cylinder 11, and the driving motor 7 can also be driven to move downward, thereby driving the sleeve 9 to move downward along its axis, so that the inner gear teeth 9- 1 is separated from the cam 8, and the outer gear teeth 9-2 are matched with the driven gear, so that the drive motor 7 is engaged with the rotary transmission assembly to provide power for the rotation of the clamping mechanism. When the drive cylinder 11 drives the telescopic piece 11-1 to move upward , the sleeve 9 moves upward, the outer gear teeth 9-2 on the sleeve 9 are separated from the driven gear teeth 10-1, and the inner gear teeth 9-1 cooperate with the cam 8 to realize the engagement of the power of the driving motor 7 and the screw rod 3 , to provide the clamping or loosening power for the clamping member 2; the switching of the power source between the clamping member 2 and the clamping mechanism is realized by driving the cylinder 11, which improves the flexibility of the bearing clamping and processing.

Referring to FIGS. 1-3 and 6-7 , the lower end of the base 1 is provided with a fixing sleeve 12 , and the fixing sleeve 12 is sleeved on the upper end of the annular journal 10 and is fixedly connected with the annular journal 10 . By arranging the fixing sleeve 12 , the disassembly and installation of the base 1 and the annular journal 10 are facilitated.

Referring to FIG. 6, the base 1 is provided with a through hole 1-2, the through hole 1-2 extends along the direction of the movement of the clamping members 2 away from each other, and the screw rod 3 passes through the through hole 1-2. The holes 1 - 2 are fixed on the base 1 through the bearing support seat 15 . The arrangement of the through holes 1-2 greatly reduces the weight of the base 1, thereby reducing the load of the machine tool.

1-3 and FIG. 7, the variable diameter bearing fixture further includes a bearing seat 13 for supporting the annular journal 10, the bearing seat 13 is fixed on the machine tool, the annular journal 10 It is rotatably mounted on the bearing seat 13 . By arranging the bearing seat 13 , the annular journal 10 can run along the circumference and serve to support the annular journal 10 , so that the clamping mechanism can be fixedly installed on the machine tool.

Referring to FIGS. 1-3 and 7 , a bearing bush 14 is arranged between the annular journal 10 and the bearing seat 13 , the advantage of which is that the friction of the annular journal 10 can be reduced and the service life can be improved.

Referring to Figures 1-6, the working principle of the above variable diameter bearing fixture is:

When it is necessary to strengthen the grinding process of the outer raceway of the inner ring of the bearing, pass the center of the inner ring of the bearing through the two inner ring clamping parts 2-11, and the driving part drives the screw 3 to rotate, thereby driving the screw nut 4 along the screw 3 Moving in the direction of the axis drives the connecting rod 5 to move, and then drives the two clamping parts 2 to move away from each other until the two inner ring clamping parts 2-11 abut against the inner ring of the bearing to realize the clamping of the inner ring of the bearing ; Then drive the clamping mechanism to rotate along its center through the rotary driving mechanism, and then drive the rotation of the inner ring of the bearing, and finally realize the enhanced grinding of the outer raceway of the inner ring of the bearing; after the processing is completed, the rotary driving mechanism stops driving and clamping The mechanism rotates along its center, and the driving member drives the screw 3 to rotate in the opposite direction, thereby driving the screw nut 4 to move down along the axis of the screw 3, driving the connecting rod 5 to move, and then driving the two clamping members 2 to interact with each other. Move closer until the two inner ring clamping parts 2-11 loosen the bearing inner ring to complete the machining of the bearing inner ring.

When it is necessary to strengthen the grinding process of the inner raceway of the outer ring of the bearing, place the outer ring of the bearing between the two outer ring clamping parts 2-12, and the driving element drives the screw 3 to rotate, thereby driving the screw nut 4 along the screw 3 The axis moves downward, driving the connecting rod 5 to move, and then driving the two clamping parts 2 to move closer to each other, until the two outer ring clamping parts 2-12 abut against the outer ring of the bearing to realize the clamping of the outer ring of the bearing ; Then drive the clamping mechanism to rotate along its center through the rotary driving mechanism, and then drive the rotation of the outer ring of the bearing, and finally realize the enhanced grinding of the inner raceway of the outer ring of the bearing; after the processing is completed, the rotary driving mechanism stops driving and clamping The mechanism rotates along its center, and the driving member drives the screw rod 3 to rotate in the opposite direction, thereby driving the screw rod nut 4 to move along the axis of the screw rod 3, driving the connecting rod 5 to move, and then driving the two clamping members 2 to interact with each other. Move closer until the two outer ring clamping parts 2-12 loosen the bearing outer ring to complete the machining of the bearing outer ring.

Example 2

Referring to FIG. 10 , other structures in this embodiment are the same as those in Embodiment 1, except that the screw rod 3 passes through the base 1 and is rotatably connected to the middle of the base 1 through a rolling bearing, and the through hole 1-2 are respectively arranged at both ends of the base 1 . With this arrangement, the through holes 1-2 can also reduce the weight of the base 1, thereby reducing the load of the machine tool; Stability and improved rotation accuracy.

Example 3

Referring to FIG. 11 , other structures in this embodiment are the same as those in Embodiment 1, except that the lower ends of the two clamping arms 2 - 2 are hinged to the base 1 respectively. The screw 3 is driven to rotate by the driving member, so that the screw nut 4 is driven to move along the axis of the screw 3, and the connecting rod 5 is driven to move, thereby driving the clamping arm 2-2 to rotate back and forth around the hinge at the lower end thereof to realize the clamping operation. The tightening parts 2-1 move toward or away from each other, so as to realize the clamping of the bearing.

The above is the preferred embodiment of the present invention, but the embodiment of the present invention is not limited by the above-mentioned content, and any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention, All should be equivalent replacement modes, which are all included in the protection scope of the present invention.

Claims (7)

1. A variable diameter bearing clamp, comprising a clamping mechanism for clamping a bearing and a rotary drive mechanism for driving the clamping mechanism to rotate; the clamping mechanism comprises a base, two oppositely disposed in the A clamping piece on the base for clamping the bearing and a clamping driving mechanism for driving the two clamping pieces to approach or move away from each other; it is characterized in that: The clamping part comprises a clamping part at the upper end and a clamping arm at the lower end; wherein the clamping part comprises an inner ring clamping part at the upper part for clamping the inner ring of the bearing and a lower part for clamping The outer ring clamping part of the bearing outer ring; The clamping driving mechanism includes a driving member and a transmission assembly arranged between the two clamping members for transmitting the power of the driving member; the transmission assembly includes a driving member passing through the base and being rotatably mounted on the base the screw on the screw rod, the screw nut that cooperates with the screw rod, and two connecting rods arranged opposite the screw nut and the clamping part; one end of the connecting rod is connected to the screw nut hinged, the other end is hinged with the clamping arm, and the driving member is connected with the lower end of the screw rod; The power source of the rotary drive mechanism and the drive member is the same drive motor; The transmission assembly further comprises a cam arranged on the lower end of the screw rod and a sleeve arranged on the main shaft of the driving motor, and the inside of the sleeve is provided with internal gear teeth that cooperate with the cam; The rotary drive mechanism also includes a rotary transmission assembly for transmitting the power of the driving motor to the base and a control assembly for mutually switching the power source between the screw rod or the base; the rotary transmission assembly includes a sleeve set. An annular journal on the sleeve, outer gear teeth arranged on the outer surface of the sleeve, and driven gear teeth arranged on the inner surface of the annular journal and cooperating with the outer gear teeth; the annular shaft The neck is fixedly connected to the base. 2 . The variable diameter bearing clamp according to claim 1 , wherein the clamping portion and the clamping arm are arc-shaped, and the arc-shaped is outward relative to the screw rod. 3 . Protruding; the arc radian of the inner ring clamping part is smaller than the arc radian of the outer ring clamping part. 3 . The variable diameter bearing fixture according to claim 2 , wherein the lower end of the inner ring clamping part and the lower end of the outer ring clamping part are provided with limit parts; The limiting portion of the ring clamping portion extends along the clamping direction of the inner ring of the bearing, and the limiting portion of the outer ring clamping portion extends along the clamping direction of the outer ring of the bearing. 4 . The variable diameter bearing clamp according to claim 3 , characterized in that, between the base and the clamping arm, there is a setting between the base and the clamping arm for guiding the two clamping arms to face each other on the base. 5 . A moving guide assembly; the guide assembly includes a chute set on the base and a slider set on the clamping arm and matching the chute. 5 . The variable diameter bearing fixture according to claim 4 , wherein limit blocks are provided on both ends of the chute. 6 . 6 . The variable diameter bearing fixture according to claim 1 , wherein the control assembly comprises a control assembly disposed at the lower end of the driving motor and used to drive the sleeve to move back and forth along its axis direction. 7 . A driving cylinder; the telescopic part of the driving cylinder is connected with the driving motor. 7 . The variable diameter bearing fixture according to claim 6 , wherein the lower end of the base is provided with a fixing sleeve, and the fixing sleeve is sleeved on the upper end of the annular journal and is connected to the annular shaft. 8 . neck fixed connection; The variable diameter bearing fixture further comprises a bearing seat for supporting the annular journal, the bearing seat is fixed on the machine tool, and the annular journal is rotatably mounted on the bearing seat; the annular journal A bearing bush is arranged between it and the bearing seat.

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