阅读说明：本技术 一种数控滚齿机主轴结构 (Main shaft structure of numerical control gear hobbing machine ) 是由 曾令万 杨灿辉 孙蔚 何顺围 简圣前 曹孝伟 于 2020-12-09 设计创作，主要内容包括：本发明属于用于补偿机床不均匀性的零部件技术领域,具体涉及一种数控滚齿机主轴结构,包括滚刀主轴本体,滚刀主轴本体两端通过滚动轴承转动连接在滚刀主轴架上,滚刀主轴本体上远离安装滚刀的一端上同轴安装有盘形零件。解决了数控滚齿机在加工过程中产生同步误差后进行转速补偿,从而保证滚刀主轴回转精度的问题。(The invention belongs to the technical field of parts for compensating unevenness of a machine tool, and particularly relates to a numerical control gear hobbing machine main shaft structure which comprises a hobbing cutter main shaft body, wherein two ends of the hobbing cutter main shaft body are rotatably connected to a hobbing cutter main shaft frame through rolling bearings, and a disc-shaped part is coaxially arranged on one end, far away from the installation of a hobbing cutter, of the hobbing cutter main shaft body. The problem of numerical control gear hobbing machine carry out rotational speed compensation after producing synchronous error in the course of working to guarantee hobbing cutter main shaft gyration precision is solved.)

1. The utility model provides a numerical control gear hobbing machine owner axle construction, includes hobbing cutter main shaft body, and hobbing cutter main shaft body both ends are passed through antifriction bearing and are rotated and connect on hobbing cutter main shaft frame, its characterized in that: and a disc-shaped part is coaxially arranged on one end of the hob spindle body, which is far away from the hob.

2. The numerical control gear hobbing machine spindle structure according to claim 1, characterized in that: the hob main shaft body is provided with a through hole along the axial direction, a pull claw and a first push rod are connected in the through hole in a sliding mode, the pull claw is located at one end, close to the position where the hob is installed, of the hob main shaft body, the end portion of the pull claw is connected with the end portion of the first push rod in a clamping mode, and one end, far away from the pull claw, of the first push rod extends to the position of the disc-.

3. The numerical control gear hobbing machine spindle structure according to claim 2, characterized in that: the disk-shaped part is connected with the hob spindle body through a key.

4. A numerically controlled gear hobbing machine spindle structure according to claim 3, characterized in that: the rolling bearing close to the pull claw side on the hob main shaft body is a first rolling bearing, the first rolling bearing is a double-row cylindrical roller bearing and a bidirectional thrust angular contact ball bearing which are coaxially arranged side by side, the double-row cylindrical roller bearing is located on the outer side of the bidirectional thrust angular contact ball bearing, an inner bushing and an outer bushing are arranged between the double-row cylindrical roller bearing and the bidirectional thrust angular contact ball bearing respectively, two ends of the inner bushing are abutted to inner rings of the double-row cylindrical roller bearing and the bidirectional thrust angular contact ball bearing respectively, and two ends of the outer bushing are abutted to outer rings of the double-row cylindrical roller bearing and the bidirectional thrust angular.

5. The numerical control gear hobbing machine spindle structure according to claim 4, characterized in that: and one side of the bidirectional thrust angular contact ball bearing, which is far away from the double-row cylindrical roller bearing, is provided with a locking nut, and the locking nut is coaxially connected to the hob spindle body in a threaded manner.

6. The numerical control gear hobbing machine spindle structure according to claim 1, characterized in that: the middle part of the hob main shaft body is provided with a stress structure connected with power input, and the stress structure is rotatably connected with the hob main shaft frame.

7. The numerical control gear hobbing machine spindle structure according to claim 4, characterized in that: and the rolling bearing on the side close to the disc-shaped part on the hob main shaft body is a second rolling bearing, an end cover is arranged on the outer side of the second rolling bearing, and a compression nut for fixing the end cover on the hob main shaft frame is arranged on the end cover.

8. The numerical control gear hobbing machine spindle structure according to claim 7, characterized in that: the oil cylinder is installed on the outer side of the disc-shaped part and comprises an oil cylinder seat, an oil cylinder cover, a piston, an oil inlet pipe and a rotary joint, the oil cylinder seat is connected with the disc-shaped part, the oil cylinder cover is closed on the oil cylinder seat, the piston is connected into the oil cylinder seat in a sliding mode, a second push rod is installed on the piston and is connected with and coaxial with the first push rod, the oil inlet pipe is installed on the oil cylinder cover and is communicated with the oil cylinder seat, the oil inlet pipe is rotatably connected into the rotary joint, and an oil inlet is formed in the rotary joint.

9. The numerical control gear hobbing machine spindle structure according to claim 8, characterized in that: the outer side of the disc-shaped part is coaxially provided with a mounting groove, a dynamic balance ring is mounted in the mounting groove, two sides of the dynamic balance ring are respectively abutted against the disc-shaped part and the oil cylinder seat, balance weight mounting holes are circumferentially and uniformly distributed on the dynamic balance ring, and the dynamic balance device further comprises a plurality of balance weights which can be slidably mounted in the balance weight mounting holes.

10. The numerical control gear hobbing machine spindle structure of claim 9, characterized in that: the dynamic balance ring comprises an inner ring and an outer ring, the outer ring is coaxially connected to the outside of the inner ring in a rotating mode, the width of the outer ring is smaller than that of the inner ring, pin holes penetrating through the inner ring are uniformly distributed in the radial direction of the inner ring, a sinking groove corresponding to the pin holes in position is formed in the end face of the outer ring, the side wall of the sinking groove faces the end face of the outer ring, a communicating hole is formed in the side wall, close to the inner ring, of the sinking groove in a penetrating mode, the balancing weight is a balancing weight ball and a balancing weight pin, the balancing weight ball is connected into the sinking groove in a sliding mode, the depth of the sinking groove is larger than the sum of the diameter of the balancing weight ball and the diameter of the balancing weight pin, the distance from an orifice at one side, close to the inner ring, of the communicating hole.

Technical Field

The invention belongs to the technical field of parts for compensating unevenness of a machine tool, and particularly relates to a spindle structure of a numerical control gear hobbing machine.

Background

The existing hobbing machine spindle system has poor rigidity in the process of efficiently processing a large-modulus gear, and the cutting force in the gear hobbing process is discontinuous and changes periodically, so that the rotation precision of a hobbing machine spindle changes along with the change of the hobbing cutting force, and the hobbing machine cannot be guaranteedThe motion relation between the main shaft and the rotating speed of the workbench,and the axial feeding motion relation of the gear hobbing machine slide plateThe error of the machined gear is large, and the high-efficiency machining requirement of a user cannot be met.

In the above formulas: n is_C-table speed (rpm), Z-workpiece tooth number, K-hob head number, n_B-hob spindle speed (rpm) CgC-table speed command, PosB-hob spindle coordinate position, PosZ-tool holder slide (Z axis) coordinate position, PosY-hob axial coordinate position, β -workpiece helix angle, δ -tool holder setting angle, m_nWorkpiece normal modulus (mm).

The control system of the numerical control gear hobbing machine consists of elements such as a computer numerical control system, a servo driver, a servo motor, a speed and position sensor and the like, and a schematic diagram of the control system is shown in figure 1.

In order to realize gear hobbing of a numerical control gear hobbing machine tool, the motion of a hob spindle of the numerical control gear hobbing machine tool must be synchronously controlled with the rotary motion of a workbench. If the bevel gear is machined, the differential compensation motion of the Z axis needs to be coupled for linkage control during synchronization.

FIG. 2 is a principal and subordinate control transmission relationship information processing schematic diagram of the numerical control gear hobbing machine.

Setting the time period as T, four counters count the pulses sent by the B, C, Y, Z four-axis encoder. The method comprises the following steps: rb, Rc, Ry, Rz, the count values of the counter in the period T are:

when the control system works stably, according to the coupling relation, the following steps are provided:

R_c＝R＝R_b·K_b+R_y·K_y+R_z·K_z

wherein the content of the first and second substances,

when fluctuation occurs in the machining process, a synchronization error E occurs, and E is R-Rc, so that a spindle structure for compensating the rotation speed of the hob spindle according to the positive and negative conditions of E is urgently needed to ensure the rotation precision of the hob spindle.

Disclosure of Invention

The invention aims to provide a main shaft structure of a numerical control gear hobbing machine, which aims to solve the problem that the rotation precision of a main shaft of a hobbing cutter is ensured by performing rotation speed compensation after a synchronous error is generated in the machining process of the numerical control gear hobbing machine.

In order to achieve the purpose, the scheme of the invention is as follows: the utility model provides a numerical control gear hobbing machine main shaft structure, includes the hobbing cutter main shaft body, and hobbing cutter main shaft body both ends are passed through antifriction bearing and are rotated and connect on hobbing cutter main shaft frame, and the coaxial disk part of installing is served to one of keeping away from the installation hobbing cutter on the hobbing cutter main shaft body.

The working principle and the beneficial effects of the scheme are as follows: in order to compensate the influence of the change of discontinuous cutting force on the rotation precision of the hob spindle in the gear hobbing process, a disc-shaped part is additionally arranged at the tail of the hob spindle body (namely, the end, far away from the end, on which the hob is arranged, of the hob spindle body), the rotational inertia of the whole hob spindle structure is increased, when the gear hobbing cutting force is reduced, the speed of the hob spindle body is accelerated, the kinetic energy of the disc-shaped part is increased, the energy is stored, the rotating speed of the hob spindle body returns to normal uniform motion, when the gear hobbing cutting force is increased, the speed of the hob spindle body is reduced, the kinetic energy of the disc-shaped part is reduced, the energy is released, the rotating speed of the hob spindle body returns to normal uniform motion, the disc-shaped part is used for storing the rotating energy of the hob spindle body, and the changeThe influence of the degree compensates the rotating speed of the hob main shaft body, so that the hob main shaft body rotates at a constant speed all the timeAnd the movement relation ensures the rotation precision of the whole hob spindle structure and improves the hobbing precision and the hobbing efficiency.

Optionally, a through hole is formed in the hob spindle body in the axial direction, a pull claw and a first push rod are slidably connected in the through hole, the pull claw is located at one end, close to the position where the hob is installed, of the hob spindle body, the end portion of the pull claw is clamped with the end portion of the first push rod, and one end, far away from the pull claw, of the first push rod extends to the disc-shaped part.

The first push rod is pushed and pulled at the tail part of the hob main shaft body, so that the pull claw can be driven to move, and the hob can be conveniently replaced.

Optionally, the disk-shaped part is keyed to the hob spindle body. The installation of the disc-shaped part is convenient, the transmission is stable, and the reliability is high.

Optionally, the rolling bearing on the hob main shaft body, which is close to the pull claw side, is a first rolling bearing, the first rolling bearing is a double-row cylindrical roller bearing and a two-way angular contact thrust ball bearing which are coaxially arranged side by side, the double-row cylindrical roller bearing is located on the outer side of the two-way angular contact thrust ball bearing, an inner bushing and an outer bushing are respectively arranged between the double-row cylindrical roller bearing and the two-way angular contact thrust ball bearing, two ends of the inner bushing are respectively abutted against inner rings of the double-row cylindrical roller bearing and the two-way angular contact thrust ball bearing, and two ends of the outer bushing are respectively abutted against outer rings.

The double-row cylindrical roller bearing and the bidirectional angular contact thrust ball bearing both have high rigidity and good radial and axial rigidity, can well bear radial pressure generated during hobbing processing, and improve the rigidity of the whole main shaft structure.

Optionally, one side, away from the double-row cylindrical roller bearing, of the bidirectional thrust angular contact ball bearing is provided with a locking nut, and the locking nut is coaxially and threadedly connected to the hob spindle body. The bidirectional thrust angular contact ball bearing and the double-row cylindrical roller bearing are limited by the locking nut.

Optionally, a stress structure connected with power input is arranged in the middle of the hob main shaft body, and the stress structure is rotatably connected with the hob main shaft frame.

The stress structure is arranged in the middle of the hob main shaft body, the hob main shaft body is limited by the aid of the rotary connection with the hob main shaft frame, and accordingly the rigidity of the whole main shaft structure is further improved.

Optionally, the rolling bearing on the hob main shaft body near the disc-shaped part is a second rolling bearing, an end cover is arranged on the outer side of the second rolling bearing, and a compression nut for fixing the end cover on the hob main shaft frame is arranged on the end cover. And one side of the hob main shaft body close to the disc-shaped part can also be ensured to stably rotate.

Optionally, an oil cylinder is installed on the outer side of the disc-shaped part, the oil cylinder comprises an oil cylinder seat, an oil cylinder cover, a piston, an oil inlet pipe and a rotary joint, the oil cylinder seat is connected with the disc-shaped part, the oil cylinder cover is closed on the oil cylinder seat, the piston is slidably connected in the oil cylinder seat, a sealing ring is arranged between the piston and the oil cylinder seat, a second push rod is installed on the piston, the second push rod is connected with and coaxial with the first push rod, the oil inlet pipe is installed on the oil cylinder cover and communicated with the oil cylinder seat, the oil inlet pipe is rotatably connected in the rotary joint, and an oil inlet is.

The piston can be driven to move towards the second push rod side by oil inlet of the oil inlet, so that the first push rod is driven to move, and the pull claw is driven to move. The oil inlet pipe is connected with the rotary joint in a rotating mode, so that the disc-shaped part can drive the whole oil cylinder to rotate relative to the rotary joint, and free rotation of the disc-shaped part is guaranteed.

Optionally, the outer side of the disc-shaped part is coaxially provided with a mounting groove, a dynamic balance ring is mounted in the mounting groove, two sides of the dynamic balance ring respectively abut against the disc-shaped part and the oil cylinder seat, balance weight mounting holes are circumferentially and uniformly distributed on the dynamic balance ring, and the balance weight device further comprises a plurality of balance weights which are slidably mounted in the balance weight mounting holes.

The disc-shaped part has large rotational inertia, the dynamic balance ring is fixed between the disc-shaped part and the oil cylinder seat through the oil cylinder seat, and then the counterweight block is adjustably installed in the counterweight installation hole, so that the disc-shaped part and the oil cylinder connected with the disc-shaped part can keep dynamic balance during rotation, and the service life of the whole main shaft structure is prolonged.

Optionally, the dynamic balance ring comprises an inner ring and an outer ring, the outer ring is coaxially and rotatably connected to the outside of the inner ring, the width of the outer ring is smaller than that of the inner ring, pin holes penetrating through the inner ring are uniformly distributed in the radial direction of the inner ring, a sinking groove corresponding to the pin holes in position is formed in the end face of the outer ring, the side wall of the sinking groove faces the end face of the outer ring, a communicating hole is formed in the side wall, close to the inner ring, of the sinking groove in a penetrating mode, the balancing weight is a balancing weight ball and a balancing weight pin, the balancing weight is slidably connected in the sinking groove, the depth of the sinking groove is larger than the sum of the diameter of the balancing weight ball and the diameter of the balancing weight pin, the distance from an orifice at one side of the communicating hole, close to the opposite side of the sinking groove, of the.

When the dynamic balance adjustment is performed, the counterweight ball is placed in the sinking groove, the counterweight pin is inserted in the communication hole and the pin hole, and the counterweight pin abuts against the counterweight ball. When the disc-shaped part is rotated, the counterweight ball is pressed against the side wall of the sinking groove by the counterweight pin under the action of centrifugal force, and the inner ring and the outer ring rotate simultaneously because the distance from the opening of one side of the communication hole close to the inner ring to the side wall of the opposite sinking groove is greater than the length of the counterweight pin and less than the relationship between the diameter of the counterweight ball and the sum of the diameters of the counterweight pin. When the disc-shaped part has good dynamic balance and stable operation, the balance weight ball and the balance weight pin always keep a tight state. When the disc-shaped part is used for a period of time, the dynamic balance performance of the disc-shaped part is reduced along with the abrasion between the rotating parts on the main shaft structure, and the disc-shaped part can generate vibration. Along with the lapse of time, the vibration strengthens gradually, and the vibration will lead to the counter weight ball to take place the sideslip laterally for counter weight round pin and counter weight ball break away from, counter weight round pin directly support on the heavy groove lateral wall, and the counter weight round pin will no longer pin joint inner ring and outer loop simultaneously, and the outer loop breaks away from with the inner ring, and disc part is when carrying out rotational speed compensation to the hobbing cutter main shaft body, and disc part will do variable acceleration motion, and the outer loop takes place to rotate under inertial effect for the inner ring, and outer loop and inner ring produce the friction and send the noise, remind operating personnel to carry out the dynamic balance test again and adjust.

Drawings

FIG. 1 is a schematic view of a control system of a numerical control gear hobbing machine in the prior art;

FIG. 2 is a schematic diagram of information processing of transmission relationship of a numerical control gear hobbing machine in the prior art;

FIG. 3 is a schematic structural diagram according to a first embodiment of the present invention;

fig. 4 is a schematic structural diagram of a dynamic balancing ring in the second embodiment of the present invention.

Detailed Description

The following is further detailed by way of specific embodiments:

reference numerals in the drawings of the specification include: the hob main shaft comprises a hob main shaft body 1, a double-row cylindrical roller bearing 2, an inner bushing 3, an outer bushing 4, a two-way thrust angular contact ball bearing 5, an external thread 6, a locknut 7, a driven gear 8, a second rolling bearing 9, a second push rod 10, a disk-shaped flywheel 11, an oil inlet pipe 12, a sealing ring 13, a first push rod 14, a piston 15, an oil inlet 16, a rotary joint 17, an oil cylinder cover 18, an oil cylinder seat 19, a dynamic balance ring 20, an inner ring 201, an outer ring 202, a sinking groove 203, a pin hole 204, a balance weight ball 205 and a balance weight pin 206

Example one

This embodiment is substantially as shown in fig. 3: the utility model provides a numerical control gear hobbing machine main shaft structure, includes hobbing cutter main shaft body 1, and hobbing cutter main shaft body 1 both ends are rotated through first antifriction bearing and second antifriction bearing 9 and are connected on hobbing cutter main shaft frame, and one of keeping away from installation hobbing cutter on hobbing cutter main shaft body 1 serves coaxial arrangement to have disk flywheel 11, is connected through the parallel key between hobbing cutter main shaft body 1 and the disk flywheel 11, and the second antifriction bearing 9 outside is equipped with the end cover, is equipped with on the end cover to fix the gland nut on hobbing cutter main shaft frame with the end cover.

A through hole is axially formed in the hob spindle body 1, a pull claw and a first push rod 14 are connected in the through hole in a sliding mode, the pull claw is located at one end, close to the position where the hob is installed, of the hob spindle body 1, the end portion of the pull claw is connected with the end portion of the first push rod 14 in a clamping mode, and one end, far away from the pull claw, of the first push rod 14 extends to the position of the disc-shaped flywheel 11.

The rolling bearing that is close to the draw claw side on hobbing cutter main shaft body 1 is first rolling bearing, first rolling bearing is coaxial double row cylindrical roller bearing 2 and two-way thrust angular contact ball bearing 5 that set up side by side, double row cylindrical roller bearing 2 is located two-way thrust angular contact ball bearing 5's the outside, be equipped with neck bush 3 and outer bush 4 between double row cylindrical roller bearing 2 and the two-way thrust angular contact ball bearing 5 respectively, neck bush 3 both ends support respectively on double row cylindrical roller bearing 2 and two-way thrust angular contact ball bearing 5's inner circle, outer bush 4 both ends support respectively on double row cylindrical roller bearing 2 and two-way thrust angular contact ball bearing 5's outer lane. One side of the bidirectional thrust angular contact ball bearing 5 far away from the double-row cylindrical roller bearing 2 is provided with an external thread 6 and a locking nut 7, and the locking nut 7 is coaxially connected to the hob spindle body 1 through the external thread 6.

The middle part of the hob main shaft body 1 is provided with a stress structure connected with power input, the stress structure is usually a driven gear 8 or a driven gear 8, in this embodiment, the driven gear 8 is preferred, and the stress structure is rotatably connected with the hob main shaft frame.

An oil cylinder is mounted on the outer side of the disc-shaped flywheel 11 through a flange, the oil cylinder comprises an oil cylinder seat 19, an oil cylinder cover 18, a piston 15, an oil inlet pipe 12 and a rotary joint 17, the oil cylinder seat 19 is connected with the disc-shaped flywheel 11, the oil cylinder cover 18 covers the oil cylinder seat 19, the piston 15 is connected in the oil cylinder seat 19 in a sliding mode, a sealing ring 13 is arranged between the piston 15 and the oil cylinder seat 19, a second push rod 10 is mounted on the piston 15, the second push rod 10 is connected with and coaxial with a first push rod 14, the oil inlet pipe 12 is mounted on the oil cylinder cover 18 and communicated with the oil cylinder seat 19, the oil inlet pipe 12 is rotatably connected in the rotary joint 17, and an oil inlet 16. The disc flywheel 11 and the oil cylinder are kept pressed tightly through a dynamic balance ring 20.

The specific implementation process comprises the following steps: when pressure oil is injected into the oil cylinder through the oil inlet 16, the piston 15 moves towards the second push rod 10, so that the first push rod 14 is driven to move, the pull claw is driven to move, and the hob is mounted or dismounted. And the oil inlet pipe 12 is connected with the rotary joint 17 in a rotating way, so that the disk-shaped flywheel 11 can drive the whole oil cylinder to rotate relative to the rotary joint 17, and the free rotation of the disk-shaped flywheel 11 is ensured. After the rotation output by the motor is transmitted to the driven belt wheel, the driven belt wheel drives the hob main shaft body 1 to rotate on the hob main shaft frame, and then hobbing is carried out.

After the disk flywheel 11 is additionally arranged at the tail part of the hob spindle body 1, the rotational inertia of the whole hob spindle structure is increased, when the hobbing cutting force is reduced, the speed of the hob spindle body 1 is accelerated, the kinetic energy of the disk flywheel 11 is increased, the energy is stored, the rotating speed of the hob spindle body 1 returns to normal uniform motion, when the hobbing cutting force is increased, the speed of the hob spindle body 1 is reduced, the kinetic energy of the disk flywheel 11 is reduced, the energy is released, the rotating speed of the hob spindle body 1 returns to normal uniform motion, the disk flywheel 11 is used for storing the energy of the rotation of the hob spindle body 1, the influence of the change of the cutting force on the rotation precision of the hob spindle body 1 during hobbing is overcome, the rotating speed of the hob spindle body 1 is compensated, the hob spindle body 1 rotates at a uniform speed, and the requirement of alwaysAndthe movement relation ensures the rotation precision of the whole hob spindle structure and improves the hobbing precision and the hobbing efficiency.

Example two

The present embodiment differs from the first embodiment only in that: the outer side of the disk flywheel 11 is coaxially provided with a mounting groove, a dynamic balance ring 20 is mounted in the mounting groove, as shown in fig. 4, the dynamic balance ring 20 comprises an inner ring 201 and an outer ring 202, the outer ring 202 is coaxially and rotatably connected outside the inner ring 201, the width of the outer ring 202 is smaller than that of the inner ring 201, pin holes 204 penetrating through the inner ring 201 are uniformly distributed in the radial direction of the inner ring 201, a sinking groove 203 corresponding to the pin holes 204 is formed in the end surface of the outer ring 202, the side wall of the sinking groove 203 is kept horizontal, the opening of the sinking groove 203 faces the end surface of the outer ring 202, a communication hole is penetratingly formed in the side wall of the sinking groove 203 close to the inner ring 201, a counterweight ball 205 and a counterweight pin 206 are arranged on the end surface of the outer ring 202, the counterweight ball 205 is slidably connected in the sinking groove 203, the depth of the sinking groove 203 is larger than the sum of the diameter of the counterweight ball 205 and the diameter of the counterweight pin 206, the distance from, the balance weight pin 206 is slidably coupled in the pin hole 204 and the communication hole.

The specific implementation process comprises the following steps: at the time of dynamic balance adjustment, the weight ball 205 is placed in the sinking groove 203, the weight pin 206 is inserted in the communication hole and the pin hole 204, and the weight pin 206 abuts against the weight ball 205. When the disk flywheel 11 is rotated, the weight pin 206 presses the weight ball 205 against the side wall of the sinking groove 203 by the centrifugal force, and the inner ring 201 and the outer ring 202 rotate simultaneously because the distance from the opening of the communicating hole near the inner ring 201 to the side wall of the opposite sinking groove 203 is larger than the length of the weight pin 206 and smaller than the relation between the diameter of the weight ball 205 and the sum of the diameters of the weight pin 206.

When the disk flywheel 11 is dynamically balanced and operates smoothly, the weight ball 205 and the weight pin 206 are always kept in a tight state.

When the disk flywheel 11 is used for a period of time, the dynamic balance performance of the disk flywheel 11 is reduced along with the abrasion between the rotating parts on the main shaft structure, and the disk flywheel 11 will generate vibration. Along with the lapse of time, vibration is strengthened gradually, vibration will cause the counter weight ball 205 to take place the sideslip laterally, make counter weight pin 206 and counter weight ball 205 break away from, counter weight pin 206 directly supports on the heavy groove 203 lateral wall, counter weight pin 206 will no longer pin joint inner ring 201 and outer ring 202 simultaneously, outer ring 202 breaks away from with inner ring 201, disc flywheel 11 when carrying out rotational speed compensation to hobbing cutter main shaft body 1, disc flywheel 11 will do variable acceleration motion, outer ring 202 rotates relative to inner ring 201 under the effect of inertia, outer ring 202 and inner ring 201 produce the friction and send the noise, remind the operating personnel to carry out the dynamic balance test again and adjust.

The foregoing is merely an example of the present invention and common general knowledge of known specific structures and features of the embodiments is not described herein in any greater detail. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the present invention.