Gear hobbing machine tool holder assembly and CNC gear hobbing machine

Abstract

The present invention relates to a gear hobbing machine tool holder assembly and a numerically controlled gear hobbing machine. The gear hobbing machine tool holder assembly includes a tool holder seat, a spindle assembly, a broach assembly, a push rod assembly, a tool retracting cylinder, a transmission assembly, and a sealing assembly. The tool retracting cylinder is provided with an annular rotating groove. The transmission assembly passes through the spindle assembly and extends to the rotating groove; the motor assembly is fixed to one end of the tool holder seat. The sealing assembly includes an end cover assembly and a partition assembly, and the spindle assembly passes through the end cover assembly and the partition assembly. One end of the spindle assembly passes through the end cover assembly for connecting the gear hobbing cutter group, and the other end is connected to the motor assembly. An oil lubrication space is formed between the end cover assembly and the partition assembly, and an airtight space is formed between the partition assembly and the motor assembly. The motor assembly directly drives the spindle assembly to realize efficient transmission. The sealing assembly separates the internal space of the tool holder seat to form separated oil lubrication space and airtight space. The spaces do not interfere with each other, thereby improving the stability of operation.

Description

Technical Field

[0001] The invention relates to the technical field of gear hobbing, in particular to a gear hobbing machine tool holder assembly and a numerically controlled gear hobbing machine. Background Art

[0002] The CNC gear hobbing machine processes the blank into a gear. The CNC gear hobbing machine is equipped with a machine tool body, a processing fixture arranged on the machine tool body, a tool holder assembly and a loading and unloading mechanical structure. The tool holder assembly is equipped with a gear hobbing cutter. The gear hobbing cutter cuts the blank installed on the processing fixture under the drive of the power mechanism to process spur gears, helical gears and bevel gears. For example, Chinese patent CN202726203 U discloses a fully automatic seven-axis dual direct-drive CNC dry-cut gear hobbing machine.

[0003] Chinese patent CN 204035715 U discloses a direct-drive CNC gear hobbing tool holder, including a tool holder body, a tool holder slide, a tool holder spindle assembly, a tool rod assembly, a tool holder auxiliary support assembly and a tool shifting assembly, wherein the tool holder body includes a tool holder main body, the tool holder slide includes a slide plate body, the slide plate body and the tool shifting assembly are arranged on the tool holder main body, the left side of the upper half of the slide plate body is a semicircular bracket, and the right side of the upper half is a tool holder spindle mounting hole, the tool holder auxiliary support assembly is arranged on the semicircular bracket, and the tool holder spindle assembly is partially arranged in the tool holder spindle mounting hole, one end of the tool rod assembly is connected to the tool holder spindle assembly, and the other end is connected to the tool holder auxiliary support assembly, and the tool holder auxiliary support assembly is arranged on the semicircular bracket of the slide plate body and is arranged opposite to the tool holder spindle assembly.

[0004] The tool holder adopts a direct drive structure to drive the tool holder spindle assembly to rotate so that the gear hobbing cutter can cut the blank. However, the pressure of the gear hobbing cutter on the tool holder spindle assembly increases during the dry cutting process, and the rotation flexibility and temperature rise of the tool holder spindle assembly are very likely to exceed the normal working value. The existing tool holder has poor heat dissipation performance. The related technology adopts lubricating oil flow cooling, but the tool holder does not need oil cooling in the driving part, but instead has technical problems such as operation failure due to lubricating oil leakage, so it needs to be improved. Summary of the invention

[0005] In order to overcome the problems existing in the related art, an embodiment of the present invention provides a gear hobbing machine tool holder assembly and a CNC gear hobbing machine.

[0006] According to a first aspect of an embodiment of the present invention, there is provided 1. a gear hobbing machine tool holder assembly, the gear hobbing machine tool holder assembly comprising a tool holder seat, a spindle assembly rotatably connected to the tool holder seat, a broaching tool assembly slidably connected to the spindle assembly, and a push rod assembly arranged opposite to the broaching tool assembly, an installation space for installing a gear hobbing cutter group is provided between the push rod assembly and the broaching tool assembly, characterized in that the gear hobbing machine tool holder assembly further comprises:

[0007] A tool retracting cylinder installed on the tool holder seat body and surrounding the spindle assembly, wherein the tool retracting cylinder is provided with an annular rotating groove;

[0008] A transmission assembly fixed to the broach assembly, the transmission assembly passes through the spindle assembly and extends to the rotating groove, the transmission assembly pushes the broach assembly to move axially under the driving force of the broach retracting cylinder, and the broach assembly is elastically reset after the thrust of the broach retracting cylinder disappears;

[0009] A motor assembly is fixed to one end of the tool holder seat;

[0010] A sealing assembly, the sealing assembly comprising an end cover assembly fixed to the end of the tool holder seat body and a partition assembly located in the tool holder seat body, the spindle assembly passes through the end cover assembly and the partition assembly;

[0011] Among them, one end of the main shaft assembly passes through the end cover assembly for connecting to the gear hobbing cutter group, and the other end is connected to the motor assembly. An oil lubrication space is formed between the end cover assembly and the partition assembly, and an airtight space is formed between the partition assembly and the motor assembly. The tool retraction cylinder is located in the airtight space.

[0012] In one embodiment, the broach assembly is provided with a center hole, the tool holder seat is equipped with an air intake assembly, the output shaft of the tool retracting cylinder and the transmission assembly are provided with a connected air blowing channel, and the air blowing channel connects the air intake assembly and the center hole.

[0013] In one embodiment, the output shaft of the retracting cylinder is provided with an air intake passage connected to the air intake assembly, and the outlet of the air intake passage is arranged at the rotating groove. The transmission assembly includes a transmission block fixed to the broach assembly and an annular seat fixed to the transmission block, and the annular seat is arranged around the main shaft assembly. There is a rotation gap between the annular seat and the output shaft of the retracting cylinder, and the annular seat is provided with an annular groove facing the rotating groove, and the transmission block and the annular seat are provided with an air guide passage connecting the annular groove and the center hole.

[0014] In one embodiment, the tool retraction cylinder includes a cylinder body and a piston body slidably connected to the cylinder body, the cylinder body is arranged to align with the air inlet hole connected to the air inlet assembly, the piston body includes a piston part, a first guide part protruding from one end of the piston part, a second guide part protruding from the other end of the piston part and a guide hole, the rotation groove is formed between the piston part and the first guide part, the guide hole extends from the second guide part to the rotation groove, a hydraulic chamber and an air guide chamber are formed between the cylinder body and the second guide part, and the air inlet hole, the air guide cavity and the guide hole are connected to form the air inlet channel.

[0015] In one embodiment, the tool holder seat body is provided with an exhaust assembly, and the exhaust assembly is communicated with the airtight space.

[0016] In one embodiment, the spindle assembly includes a hollow shaft body, a front bearing module and a rear bearing module installed on the hollow shaft body, and the tool holder seat body is provided with an upper lubrication oil channel and a lower lubrication oil channel. The upper lubrication oil channel is provided with a front oil channel connected to the front bearing module and a rear oil channel connected to the rear bearing module, and the lower lubrication oil channel is located at the lowest point of the oil lubrication space.

[0017] In one embodiment, the partition assembly includes a flange and a seal fixed to the main shaft assembly, the main shaft assembly passes through the flange, the seal is provided with a sealing lip, and the sealing lip seals against the inner circumferential wall of the flange.

[0018] In one embodiment, the push rod assembly includes a push rod cylinder installed on the tool holder body and a rotating tool seat connected to the push rod cylinder, and the rotating tool seat is provided with a rotatable connecting tool seat, and the connecting tool seat is used to connect the gear hobbing cutter group.

[0019] In one embodiment, the push rod cylinder includes a cylinder seat fixed to the tool holder seat, an oil guide piston fixed to the cylinder seat, and a sliding cylinder arranged on the oil guide piston. The oil guide piston is provided with a protruding piston convex ring, and the piston convex ring separates the oil guide piston into a first chamber and a second chamber. The rotating tool holder closes the opening of the sliding cylinder.

[0020] According to a second aspect of an embodiment of the present invention, there is provided a CNC gear hobbing machine, comprising a gear hobbing machine body and the gear hobbing machine tool holder assembly as described above, wherein the gear hobbing machine tool holder assembly is used for mounting a gear hobbing cutter.

[0021] The technical solution provided by the embodiment of the present invention can include the following beneficial effects: the motor assembly directly drives the spindle assembly to realize efficient transmission, and the overall size of the hobbing machine tool holder assembly is reduced. The tool retraction cylinder drives the transmission assembly to move, so as to drive the broaching assembly to push out the hobbing cutter group, thereby facilitating the replacement of the hobbing cutter group and convenient operation. The sealing assembly divides the internal space of the tool holder seat to form a separated oil lubrication space and an airtight space, and the spaces do not interfere with each other, thereby improving the stability of operation.

[0022] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0024] Figure 1 It is a schematic structural diagram of a gear hobbing machine tool holder assembly according to an exemplary embodiment.

[0025] Figure 2 is a first schematic cross-sectional view of a gear hobbing machine tool holder assembly according to an exemplary embodiment.

[0026] Figure 3 is a second schematic cross-sectional view of a gear hobbing machine tool holder assembly according to an exemplary embodiment.

[0027] Figure 4 yes Figure 2 Schematic diagram of the enlarged structure at point A in the middle.

[0028] Figure 5 yes Figure 3 Schematic diagram of the enlarged structure at point C in the middle.

[0029] Figure 6 yes Figure 2 Schematic diagram of the enlarged structure at point B in the middle.

[0030] Figure 7 yes Figure 3 Schematic diagram of the enlarged structure at D in the middle.

[0031] Figure 8 It is a structural schematic diagram of the tool retracting cylinder installed on the broach assembly.

[0032] Fig. 9 is a schematic structural diagram of a main shaft assembly according to an exemplary embodiment.

[0033] In the figure, the tool holder seat body 10; the upper lubricating oil channel 11; the lower lubricating oil channel 12; the front oil channel 13; the rear oil channel 14; the air intake assembly 15; the exhaust assembly 16; the exhaust cover 161; the spindle assembly 20; the hollow shaft body 21; the front bearing module 22; the rear bearing module 23; the double-row roller bearing 231; the double-row tapered roller bearing 232; the air guide groove 2321; the air guide hole 2322; the sleeve 233; the locking sleeve 234; the broaching tool assembly 30; the center hole 31; the broaching tool rod 32; the disc spring 33; the claw 34; the push rod assembly 40; the push rod oil cylinder 41; the oil cylinder seat 411; the oil guide piston 412; the sliding cylinder 413; the second oil channel 414; the first oil channel 415; the booster chamber 41 6; first air channel 417; air guide groove 418; rotating tool seat 42; rotating shaft 421; cover 422; bearing group 423; auxiliary air pressure assembly 43; gear hobbing cutter group 50; transmission assembly 60; blowing channel 61; air guide channel 611; guide hole 612; air guide cavity 613; air inlet hole 614; annular seat 62; annular groove 621; transmission block 63; tool retracting cylinder 70; rotating groove 71; cylinder body 72; piston body 73; piston part 731; first guide part 732; second guide part 733; motor assembly 80; rotating disk 81; screw assembly 82; sealing assembly 90; partition assembly 91; flange 911; sealing member 912; end cover assembly 92. Implementation

[0034] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on this patent; in order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0035] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "inner", "outer", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0036] In the description of the present invention, unless otherwise clearly specified and limited, if the term "connection" or the like appears to indicate the connection relationship between components, the term should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two components or the interaction relationship between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] like Figures 1 to 3 As shown, the present invention provides a gear hobbing machine tool holder assembly, which includes a tool holder base body 10, a spindle assembly 20 rotatably connected to the tool holder base body 10, a broach assembly 30 slidably connected to the spindle assembly 20, and a push rod assembly 40 arranged opposite to the broach assembly 30, and an installation space for installing a gear hobbing cutter group 50 is provided between the push rod assembly 40 and the broach assembly 30.

[0038] The tool holder seat 10 includes a main body, a first tube body and a second tube body which are spaced apart and protrude from the main body. The first tube body and the second tube body are coaxially arranged. The spindle assembly 20 is installed on the first tube body, the push rod assembly 40 is installed on the second tube body, and the gear hobbing cutter group 50 is located between the first tube body and the second tube body.

[0039] The broach assembly 30 includes a broach rod 32 slidably connected to the spindle assembly 20, a plurality of disc springs 33 sleeved on the broach rod 32, and a claw mechanism connected to the broach rod 32. The broach rod 32 tightens the claw mechanism under the elastic preload of the disc spring 33 and is limited to the spindle assembly 20. The broach rod 32 can overcome the elastic preload of the disc spring 33 under the action of thrust and push the claw mechanism to move, so that the hobbing cutter unit 50 can be replaced.

[0040] The tool holder assembly of the gear hobbing machine also includes a tool retracting cylinder 70, a transmission assembly 60, a motor assembly 80 and a sealing assembly 90. The tool retracting cylinder 70 is installed on the tool holder seat 10 and surrounds the spindle assembly 20. The tool retracting cylinder 70 can move telescopically under the drive of hydraulic pressure. The tool retracting cylinder 70 is provided with an annular rotation groove 71, and the rotation groove 71 is arranged at the telescopic movement part of the tool retracting cylinder 70. The rotation groove 71 is arranged around the spindle assembly 20, and forms an annular groove structure relative to the outer peripheral wall of the spindle assembly 20.

[0041] The transmission assembly 60 is fixed to the broach assembly 30, and the transmission assembly 60 passes through the spindle assembly 20 and extends to the rotating groove 71. The transmission assembly 60 pushes the broach assembly 30 to move axially under the driving force of the retracting cylinder 70, so that the broach assembly 30 overcomes the elastic force of the disc spring 33 and moves axially, and the user can replace or install the gear hobbing cutter group 50. When the retracting cylinder 70 retracts and disengages from the transmission assembly 60, the broach assembly 30 elastically resets after the thrust of the retracting cylinder 70 disappears, so that the pulling claw mechanism is tightened, and the gear hobbing cutter group 50 is automatically tightened into place. The retracting cylinder 70 drives the transmission assembly 60 to move, so as to drive the broach assembly 30 to push out the gear hobbing cutter group 50, thereby facilitating the replacement of the gear hobbing cutter group 50 and convenient operation.

[0042] The motor assembly 80 is fixed to one end of the tool holder seat 10 and connected to one end of the spindle assembly 20 to drive the spindle assembly 20 to rotate. The motor assembly 80 can be configured as a servo motor to form a direct drive structure, improve the response speed and reduce the overall structural size. The motor assembly 80 is installed at the end of the first tube body and is located in the axis extension direction of the spindle assembly 20. The motor assembly 80 is directly connected to the spindle assembly 20 to achieve efficient transmission and reduce the overall size of the hobbing machine tool holder assembly.

[0043] The sealing assembly 90 includes an end cap assembly 92 fixed to the end of the tool holder seat body 10 and a partition assembly 91 located in the tool holder seat body 10, and the spindle assembly 20 passes through the end cap assembly 92 and the partition assembly 91. The end cap assembly 92 is fixed to the end of the first tube body and faces the direction of the second tube body. The end cap assembly 92 is provided with a spindle hole. One end of the spindle assembly 20 passes through the end cap assembly 92 and is used to connect the gear hobbing cutter group 50. The partition assembly 91 is located in the first tube body and is used to separate the internal space of the first tube body. An oil lubrication space is formed between the end cap assembly 92 and the partition assembly 91, and an airtight space is formed between the partition assembly 91 and the motor assembly 80. The tool retracting cylinder 70 is located in the airtight space. The sealing assembly 90 separates the internal space of the tool holder seat body 10 to form a separated oil lubrication space and an airtight space. The spaces do not interfere with each other, thereby improving the stability of operation.

[0044] like Figures 1 to 5 As shown, the oil lubrication space is filled with an oil-gas environment or a liquid particle environment formed by mist lubricating oil to achieve lubrication and temperature control. In one embodiment, the spindle assembly 20 includes a hollow shaft body 21, a front bearing module 22 and a rear bearing module 23 installed on the hollow shaft body 21, the hollow shaft body 21 is a tubular structure, and the broach assembly 30 is located in the hollow shaft body 21. The front bearing module 22 and the rear bearing module 23 can improve the rotation flexibility of the hollow shaft body 21 and adjust the force form of the hollow shaft body 21.

[0045] The tool holder seat body 10 is provided with an upper lubricating oil passage 11 and a lower lubricating oil passage 12. The upper lubricating oil passage 11 is provided with a front oil passage 13 connected to the front bearing module 22 and a rear oil passage 14 connected to the rear bearing module 23. The lower lubricating oil passage 12 is located at the lowest point of the oil lubrication space. The upper lubricating oil passage 11 is connected to the oil and gas input mechanism, and the oil and gas enter the oil lubrication space along the upper lubricating oil passage 11. The oil and gas output from the front oil passage 13 are directly sprayed on the front bearing module 22, and the oil and gas output from the rear oil passage 14 are directly sprayed on the rear bearing module 23. The lubrication area is controllable and diffuses from the front bearing module 22 and the rear bearing module 23 to the surrounding area, which can not only improve the lubrication effect but also take away the operating heat and stabilize the working temperature of the spindle assembly 20. Preferably, the front bearing module 22 and / or the rear bearing module 23 are provided with a hole structure to guide the oil and gas into the rolling area.

[0046] The front bearing module 22 is close to one side of the end cover assembly 92 to support the cutting force and vibration flexibility of the gear hobbing cutter group 50. The front bearing module 22 includes rolling support and axial limitation to maintain rotation flexibility and axial force stability. In a preferred embodiment, the front bearing module 22 includes a double-row roller bearing 231, a double-row tapered roller bearing 232, a sleeve 233 and a locking sleeve 234. The outer peripheral wall of the double-row tapered roller bearing 232 is provided with a through hole, and the upper lubricating oil channel 11 corresponds to the through hole. The end cover assembly 92 is inserted into the first tube body and abuts against the outer ring of the double-row roller bearing 231. The outer ring of the double-row roller bearing 231 and the outer ring of the double-row tapered roller bearing 232 are positioned by the outer ring sleeve 233. The outer ring sleeve 233 is provided with an air guide groove 2321 and a plurality of air guide holes 2322 laterally connected to the air guide groove 2321. The air guide holes 2322 face the roller direction of the double-row roller bearing 231. The air guide groove 2321 is connected with one of the front oil passages 13 to output oil and gas toward the rollers of the double-row roller bearing 231. Optionally, the rear bearing module 23 is configured as a roller bearing to keep the main shaft assembly 20 rotating smoothly. Preferably, the tool holder seat body 10 is provided with a positioning sleeve 233, and the positioning sleeve 233 has basically the same structure as the outer ring sleeve 233. The oil and gas output by the positioning sleeve 233 enter the rear bearing module 23, so that the oil and gas can enter the oil lubrication space from the rotating part of the spindle assembly 20, thereby realizing oil lubrication and temperature control.

[0047] The double-row tapered roller bearing 232 includes a first tapered seat, a second tapered seat, a tapered outer ring, a first rotor group and a second rotor group. The first tapered seat is provided with a first tapered surface, the second tapered seat is provided with a second tapered surface, and the tapered outer ring is provided with a third tapered surface facing the first tapered surface and a fourth tapered surface facing the second tapered surface. The third tapered surface and the fourth tapered surface are triangular structures. The first rotor group is limited between the first tapered surface and the third tapered surface, and the second rotor group is limited between the second tapered surface and the fourth tapered surface, so that the double-row tapered roller bearing 232 can withstand axial force and avoid axial movement of the main shaft assembly 20. Preferably, the outer peripheral wall of the tapered outer ring is provided with an equalizing groove recessed from the surface and a plurality of equalizing holes connected to the equalizing groove. The equalizing holes extend to the vertex where the third tapered surface and the fourth tapered surface intersect, so that oil and gas can flow out in the direction of the first rotor group and the second rotor group, and the lubrication and heat dissipation effects are good.

[0048] In one embodiment, the partition assembly 91 includes a flange 911 and a seal 912 fixed to the main shaft assembly 20, the main shaft assembly 20 passes through the flange 911, and the seal 912 is provided with a sealing lip, and the sealing lip seals against the inner circumferential wall of the flange 911. The partition assembly 91 separates the first tube body, wherein a step groove is provided in the first tube body, and the flange 911 is fixed to the step surface of the step groove by a fastener to separate the first tube body into an oil lubrication space and an airtight space. The flange 911 is provided with a through shaft hole, and the hollow shaft body 21 passes through the shaft hole and is connected to the motor assembly 80. The seal 912 is an annular structure, and the seal 912 is fixed to the hollow shaft body 21 and rotates with the hollow shaft body 21. The sealing lip of the seal 912 elastically abuts against the inner wall of the flange 911 to form a dynamic seal. Preferably, the sealing member 912 is configured as an annular portion, and a sealing lip is a triangular rib obliquely protruding from the annular portion, and the end of the sealing lip elastically abuts against the flange 911 .

[0049] Optionally, the flange 911 is configured with a groove-shaped space, and the flange 911 is provided with an inserting rib to be insert-connected to the first tube body portion, and the sealing member 912 is located in the groove-shaped space of the flange 911 .

[0050] like Figure 2 , Figure 4 , Figure 5 , Figure 8 and Fig. 9 As shown, in addition to the disc spring 33 elastic telescopic structure, the broach assembly 30 also includes an airflow-assisted gear hobbing cutter assembly 50 to assist in the disassembly and assembly of the gear hobbing cutter assembly 50. In one embodiment, the broach assembly 30 is provided with a center hole 31, which is arranged along the axis of the broach assembly 30 and extends to one end of the end cap assembly 92.

[0051] The tool holder body 10 is provided with an air intake assembly 15, and the output shaft of the tool retracting oil cylinder 70 and the transmission assembly 60 are provided with a connected air blowing channel 61, and the air blowing channel 61 is connected to the air intake assembly 15 and the center hole 31. The air intake assembly 15 is connected to an air source, such as an air pump or an air storage tank, and the air intake assembly 15 can deliver high-pressure gas into the air blowing channel 61, and the high-pressure gas is output along the center hole 31 to push the gear hobbing cutter group 50 and blow clean the part of the spindle assembly 20 used to install the gear hobbing cutter group 50, so as to prevent debris and oil from affecting the installation accuracy of the gear hobbing cutter group 50. Preferably, the connecting part of the air blowing channel 61 and the center hole 31 is located in an airtight space.

[0052] The air blowing channel 61 extends along the output shaft of the knife-retracting oil cylinder 70, and can keep the gas flowing smoothly during the extension and retraction of the output shaft. The output shaft of the knife-retracting oil cylinder 70 is provided with an air intake channel connected to the air intake assembly 15, and the outlet of the air intake channel is arranged at the rotating groove 71. The knife-retracting oil cylinder 70 is fixedly installed at the tube wall of the first tube body, the air intake assembly 15 is connected to the first tube body and connected to the air intake channel, and the air intake channel is bent and extended to the bottom of the rotating groove 71, so that the air flow can be delivered to the rotating groove 71.

[0053] The transmission assembly 60 includes a transmission block 63 fixed to the broach assembly 30 and an annular seat 62 fixed to the transmission block 63, and the annular seat 62 is arranged around the spindle assembly 20. The hollow shaft body 21 is provided with a long hole-shaped avoidance hole, and the transmission block 63 passes through the avoidance hole and is fixedly connected with the annular seat 62. The annular seat 62 is arranged around the spindle assembly 20 and is located at the opening of the rotating groove 71. The output shaft of the tool retracting cylinder 70 extends and pushes the annular seat 62 to move, so that the transmission block 63 drives the broach rod 32 to move axially and overcome the elastic preload force of the disc spring 33 to move, so that the claw 34 extends out of the tapered hole part of the spindle assembly 20 and releases the gear hobbing cutter group 50. At the same time, the air intake assembly 15 blows the gear hobbing cutter group 50 through the center hole 31, thereby preventing foreign matter from falling into the tapered hole part and improving the cleanliness of the tapered hole part. The existing direct-drive tool holder structure is difficult to realize the function of starting dust removal.

[0054] When the gear hobbing cutter assembly 50 is installed in the tapered hole, the broaching assembly 30 is reset and tightened under the elastic preload of the disc spring 33. The retracting cylinder 70 is retracted, and the annular seat 62 and the transmission block 63 are reset under the elastic preload of the disc spring 33 until the transmission block 63 is reset to a preset position. The preset position is a preset clamping position where the transmission block 63 abuts against the hole wall of the avoidance hole or the broaching rod 32. Preferably, the retracting cylinder 70 continues to drive the output shaft to retract until there is a rotation gap between the bottom of the rotating groove 71 and the annular seat 62, so that the transmission assembly 60 can have both good rotation characteristics and maintain an excellent push-pull transmission effect.

[0055] Preferably, the annular seat 62 is provided with an annular groove 621 facing the rotation groove 71, and the transmission block 63 and the annular seat 62 are provided with an air guide channel 611 connecting the annular groove 621 and the central hole 31. The annular groove 621 can guide the airflow to converge to the air guide channel 611, and the airflow converges to the annular groove 621 after being output from the air inlet channel, and then converges to the air guide channel 611 along the annular groove 621, so that the air is guided smoothly and the flexibility of rotation is maintained.

[0056] Preferably, the annular seat 62 is provided with an annular groove 621 facing the rotation groove 71, and the transmission block 63 and the annular seat 62 are provided with an air guide channel 611 connecting the annular groove 621 and the central hole 31. The annular groove 621 can guide the airflow to converge to the air guide channel 611, and the airflow converges to the annular groove 621 after being output from the air inlet channel, and then converges to the air guide channel 611 along the annular groove 621, so that the air is guided smoothly and the flexibility of rotation is maintained.

[0057] In an optional embodiment, the tool retracting cylinder 70 includes a cylinder body 72 and a piston body 73 slidably connected to the cylinder body 72, and the cylinder body 72 is provided with an air inlet hole 614 aligned to the air inlet assembly 15, and the air inlet hole 614 extends along the cylinder body 72. The cylinder body 72 includes a piston cavity, and the piston body 73 slides in the piston cavity. Among them, the piston body 73 includes a piston part 731, a first guide part 732 protruding from one end of the piston part 731, a second guide part 733 protruding from the other end of the piston part 731, and a guide hole 612, and the piston part 731 is slidably connected to the piston cavity. The first guide part 732 and the second guide part 733 are annular tubular protrusion structures and protrude from both ends of the piston part 731 respectively, and a rotation groove 71 is formed between the piston part 731 and the first guide part 732. The guide hole 612 extends from the second guide portion 733 to the rotation groove 71 , a hydraulic chamber and an air guide chamber 613 are formed between the cylinder body 72 and the second guide portion 733 , and the air inlet hole 614 , the air guide chamber 613 and the guide hole 612 are connected to form an air inlet passage.

[0058] A hydraulic chamber is formed between the piston portion 731 and the piston chamber of the cylinder body 72. The cylinder body 72 is provided with an air guide chamber 613. The air guide chamber 613 and the hydraulic chamber are independently separated to form gas-liquid separation circulation, thereby improving the smoothness of the air flow guidance and the synchronization of the telescopic drive of the retracting cylinder 70.

[0059] Furthermore, the tool holder seat body 10 is provided with an exhaust assembly 16, and the exhaust assembly 16 is connected to the airtight space. An exhaust hole is provided on the main body or the first tube body, and the exhaust assembly 16 is installed on the exhaust hole to prevent the exhaust hole from being directly connected to the atmosphere, forming an airtight space in the airtight space, thereby blocking the lubricating oil from entering the airtight space through air pressure. Optionally, the exhaust assembly 16 is configured as an exhaust valve so that the airtight space opens after exceeding a preset pressure. Optionally, the exhaust hole is recessed from the surface of the tool holder seat body 10, and the one-way exhaust valve is installed in the airtight space and connected to the bottom of the exhaust hole. The exhaust assembly 16 also includes an exhaust hood 161, and the exhaust hood 161 is provided on the opening of the exhaust hole. An exhaust port connected to the exhaust hole is provided on the side of the exhaust hood 161, and the exhaust port is relatively inclined to the center line of the exhaust hole to prevent foreign matter from entering the exhaust hole.

[0060] like Figure 2 , Figure 3 , Figure 6 and Figure 7 As shown, in one embodiment, the push rod assembly 40 includes a push rod cylinder 41 installed on the tool holder body 10 and a rotating tool holder 42 connected to the push rod cylinder 41, and the rotating tool holder 42 is provided with a rotatable connecting tool holder, and the connecting tool holder is used to connect the gear hobbing cutter group 50. The push rod assembly 40 is arranged relative to the spindle assembly 20 to jointly support and limit the gear hobbing cutter group 50. Among them, the push rod cylinder 41 can push the rotating tool holder 42 to move as a whole until the rotating tool holder 42 is clamped and fixed to one end of the gear hobbing cutter group 50, and the gear hobbing cutter group 50 can rotate with the rotating tool holder 42 to improve the flexibility of rotation. The push rod cylinder 41 is directly connected to the rotating tool holder 42, which can reduce the complexity of the structure and provide support for the rotating tool holder 42.

[0061] In a preferred embodiment, the push rod oil cylinder 41 includes an oil cylinder seat 411 fixed to the tool holder seat 10, an oil guide piston 412 fixed to the oil cylinder seat 411, and a sliding cylinder 413 provided on the oil guide piston 412. The oil guide piston 412 is provided with a protruding piston convex ring, which separates the oil guide piston 412 into a first cavity and a second cavity, and the rotating tool holder 42 closes the opening of the sliding cylinder 413. The sliding cylinder 413 is slidably connected to the second tube body of the tool holder seat 10, and the rotating tool holder 42 closes the opening of the sliding cylinder 413, so that the sliding cylinder 413 forms a piston cavity structure. The piston convex ring slides on the sliding cylinder 413, wherein the oil guide piston 412 is provided in a first oil passage 415 connected to the first cavity and a second oil passage 414 connected to the second cavity. When the first oil passage 415 is filled with oil, the sliding cylinder 413 is driven to move toward the inside of the oil cylinder seat 411, so that the rotating tool holder 42 is separated from the gear hobbing cutter unit 50. The oil inlet of the second oil passage 414 drives the sliding cylinder 413 to move outward from the oil cylinder seat 411, so that the rotating cutter seat 42 is in contact with the gear hobbing cutter assembly 50 for transmission. The sliding cylinder 413 moves with the oil in and out, and a small oil pressure is required to obtain a large locking force, and the locking effect is good. In addition, the oil in the second chamber directly acts on the rotating cutter seat 42, and the oil hobbing cutter seat can be locked reliably.

[0062] Optionally, the rotating cutter seat 42 includes a rotating shaft 421, a bearing group 423 sleeved on the rotating shaft 421, and a cover 422 plugged into and sealed on the sliding cylinder 413, the outer edge of the cover 422 protrudes and abuts against the outer ring of the bearing group 423, and the outer ring of the bearing group 423 is installed on the sliding cylinder 413. The gear hobbing cutter group 50 is plugged into and connected to the rotating shaft 421 to achieve pre-compression rotation.

[0063] Preferably, the push rod oil cylinder 41 also includes an auxiliary air pressure assembly 43 connected to the oil cylinder seat 411, a boost chamber 416 is formed between the oil cylinder seat 411 and the sliding cylinder 413, and the auxiliary air pressure assembly 43 is connected to the air source to perform secondary pressurization on the sliding cylinder 413 to maintain the processing stability of the gear hobbing cutter group 50. Preferably, the push rod oil cylinder 41 also includes a blowing assembly connected to the oil cylinder seat 411, a first air channel 417 is provided on the tool holder seat body 10, and the sliding cylinder 413 is provided with a second air channel and an air guide groove 418 located around the second air channel, and the length of the air guide groove 418 is greater than or equal to the sliding distance of the sliding cylinder 413. The air outlet of the first air channel 417 faces the air guide groove 418, and the first air channel 417 is connected to the air source. The rotating tool holder 42 is provided with an airtight end cover, and the airtight end cover is provided with an air outlet gap facing the rotating shaft 421, and the air outlet gap is connected to the second air channel. The gas output from the gas outlet gap is blown toward the rotating shaft 421 to remove the debris around the rotating shaft 421 to prevent the debris from affecting the gear hobbing cutter.

[0064] The gear hobbing machine tool holder assembly also includes a rotating disk 81 , on which the tool holder seat body 10 is slidably mounted, and on which a lead screw assembly 82 is mounted. The tool holder seat body 10 is fixed to a lead screw nut of the lead screw assembly 82 .

[0065] Furthermore, the gear hobbing machine tool holder assembly disclosed in the above embodiment is applied to a CNC gear hobbing machine, which includes a gear hobbing machine body and the gear hobbing machine tool holder assembly as described above, wherein the gear hobbing machine tool holder assembly is used to install a gear hobbing cutter.

[0066] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the disclosure disclosed herein. This application is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The description and examples are to be considered exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0067] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A gear hobbing machine tool holder assembly, comprising a tool holder seat, a spindle assembly rotatably connected to the tool holder seat, a broach assembly slidably connected to the spindle assembly, and a push rod assembly arranged opposite to the broach assembly, wherein an installation space for installing a gear hobbing cutter group is provided between the push rod assembly and the broach assembly, characterized in that: The gear hobbing machine tool holder assembly also includes: A tool retracting cylinder installed on the tool holder seat body and surrounding the spindle assembly, wherein the tool retracting cylinder is provided with an annular rotating groove; A transmission assembly fixed to the broach assembly, the transmission assembly passes through the spindle assembly and extends to the rotating groove, the transmission assembly pushes the broach assembly to move axially under the driving force of the broach retracting cylinder, and the broach assembly is elastically reset after the thrust of the broach retracting cylinder disappears; A motor assembly is fixed to one end of the tool holder seat; A sealing assembly, the sealing assembly comprising an end cover assembly fixed to the end of the tool holder seat body and a partition assembly located in the tool holder seat body, the spindle assembly passes through the end cover assembly and the partition assembly; One end of the spindle assembly passes through the end cover assembly for connecting to the gear hobbing cutter assembly, and the other end is connected to the motor assembly. An oil lubrication space is formed between the end cover assembly and the partition assembly, and an airtight space is formed between the partition assembly and the motor assembly. The tool retraction cylinder is located in the airtight space. The broaching tool assembly is provided with a central hole, the tool holder seat body is provided with an air inlet assembly, the output shaft of the tool retracting cylinder and the transmission assembly are provided with a communicating air blowing channel, and the air blowing channel communicates the air inlet assembly and the central hole; The output shaft of the tool retracting oil cylinder is provided with an air intake passage communicating with the air intake assembly, the outlet of the air intake passage is arranged at the rotating groove, the transmission assembly comprises a transmission block fixed to the broach assembly and an annular seat fixed to the transmission block, the annular seat is arranged around the spindle assembly, a rotation gap is provided between the annular seat and the output shaft of the tool retracting oil cylinder, the annular seat is provided with an annular groove facing the rotating groove, and the transmission block and the annular seat are provided with an air guide passage communicating with the annular groove and the center hole; The tool retracting cylinder includes a cylinder body and a piston body slidably connected to the cylinder body, the cylinder body is provided with an air inlet hole aligned to the air inlet assembly, the piston body includes a piston part, a first guide part protruding from one end of the piston part, a second guide part protruding from the other end of the piston part and a guide hole, the rotation groove is formed between the piston part and the first guide part, the guide hole extends from the second guide part to the rotation groove, a hydraulic chamber and an air guide chamber are formed between the cylinder body and the second guide part, and the air inlet hole, the air guide cavity and the guide hole are connected to form the air inlet channel.

2. The gear hobbing machine tool holder assembly according to claim 1, characterized in that: The tool holder seat body is provided with an exhaust component, and the exhaust component is communicated with the airtight space.

3. The gear hobbing machine tool holder assembly according to claim 1, characterized in that: The spindle assembly includes a hollow shaft body, a front bearing module and a rear bearing module installed on the hollow shaft body, and the tool holder seat body is provided with an upper lubricating oil channel and a lower lubricating oil channel. The upper lubricating oil channel is provided with a front oil channel connected to the front bearing module and a rear oil channel connected to the rear bearing module, and the lower lubricating oil channel is located at the lowest point of the oil lubrication space.

4. The gear hobbing machine tool holder assembly according to claim 1, characterized in that: The partition assembly includes a flange and a sealing member fixed to the main shaft assembly. The main shaft assembly passes through the flange. The sealing member is provided with a sealing lip, and the sealing lip is sealed against the inner peripheral wall of the flange.

5. The gear hobbing machine tool holder assembly according to claim 1, characterized in that: The push rod assembly includes a push rod cylinder installed on the tool holder body and a rotating tool seat connected to the push rod cylinder. The rotating tool seat is provided with a rotatable connecting tool seat, and the connecting tool seat is used to connect the gear hobbing cutter group.

6. The gear hobbing machine tool holder assembly according to claim 5, characterized in that: The push rod cylinder includes a cylinder seat fixed to the tool holder seat body, an oil guide piston fixed to the cylinder seat, and a sliding cylinder arranged on the oil guide piston. The oil guide piston is provided with a protruding piston convex ring, and the piston convex ring separates the oil guide piston into a first chamber and a second chamber. The rotating tool holder closes the opening of the sliding cylinder.

7. A CNC gear hobbing machine, characterized in that: It comprises a gear hobbing machine body and a gear hobbing machine tool holder assembly as claimed in any one of claims 1 to 6, wherein the gear hobbing machine tool holder assembly is used for installing a gear hobbing cutter.

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