A driveshaft drive arrangement

Abstract

The application provides a transmission shaft driving device, and relates to the technical field of transmission devices.The transmission shaft driving device comprises a supporting device, a servo motor, a brake and a gear shaft.The supporting device is used for being installed on the upper beam body of a press machine, and comprises first and second supporting structures which are arranged at intervals.The servo motor is installed on the first supporting structure.The brake is installed on the second supporting structure through a supporting sleeve.The spline end of the gear shaft is drivingly connected with the servo motor through a spline sleeve installed on the servo motor, and the other end is used for being connected with the brake.The gear shaft is used for generating axial movement in the working process, so that the gear shaft and the intermediate gear in the two-stage full-helical gear realize uniform meshing of the teeth on both sides of the gear.The transmission shaft driving device of the application can realize the combination of the servo technology and the full-helical gear transmission technology of the traditional mechanical press machine, and improves the transmission performance of the servo press machine to a certain extent.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of transmission device, in particular to a transmission shaft driving device. BACKGROUND

[0002] The direct drive servo press adopts full straight gear transmission, integral driving gear shaft, and spline at both ends of the driving shaft for connecting with the brake and the shaft coupling respectively. Since all straight gears are adopted, the integral driving shaft does not need axial movement, and the driving shaft is supported by the self-aligning roller bearing on both sides.

[0003] The two-stage full double helical gear transmission adopted by the traditional mechanical press adopts spline connection between the intermediate gear and the gear shaft in the transmission chain, and the intermediate gear can move axially, so as to realize uniform meshing of the teeth on both sides of the gear by using the self-aligning function of the double helical gear, so as to prevent the phenomena such as uneven meshing of the teeth on both sides of the gear, different force, generation of axial force and the like caused by machining and assembly errors, and to accelerate the damage of key parts such as gears and bearings.

[0004] Compared with straight gear transmission, double helical gear transmission has large bearing capacity, stable operation, low noise, and is suitable for high-speed and heavy-load transmission. However, the two-stage full double helical gear transmission structure of the traditional mechanical press cannot be applied to the direct drive servo press, and the direct drive servo press is driven by two or more servo motors at the same time. When full double helical gear transmission is adopted, the axial movement of the intermediate gear cannot avoid the phenomena such as uneven meshing of the teeth on both sides of the gear, different force, generation of axial force and the like caused by machining and assembly errors. SUMMARY

[0005] The problem to be solved by the present application is how to improve the transmission performance of the servo press.

[0006] The present application provides a transmission shaft driving device applied to two-stage full double helical gear transmission of a direct drive servo press, which comprises a support device, a servo motor, a brake and a gear shaft. The support device is used for being installed on the upper beam body of the press, and comprises a first support structure and a second support structure arranged at intervals. The servo motor is installed on the first support structure. The brake is installed on the second support structure through a support sleeve. The spline end of the gear shaft is drivingly connected with the servo motor through a spline sleeve installed on the servo motor, and the other end is used for being connected with the brake. The gear shaft is used for generating axial movement in the working process, so as to realize uniform meshing of the teeth on both sides of the gear shaft and the intermediate gear in the two-stage full double helical gear.

[0007] The transmission shaft driving device provided by the present application has the following beneficial effects, but is not limited to the following:

[0008] The transmission shaft driving device is applied to two-stage full double helical gear transmission of a direct drive type servo press, and specifically, the two-stage full double helical gear transmission structure comprises an intermediate gear, a main pinion and a main gear, the intermediate gear is installed at the end of the main pinion shaft, and plays a transmission role between the gear shaft of the transmission shaft driving device and the main pinion. The whole structure can be installed on the upper beam body of the press through the supporting device, the gear shaft can be driven to rotate through the servo motor, that is, the servo motor can drive the gear shaft to rotate, and the reciprocating motion of the slider of the press is realized through the two-stage gear transmission of the intermediate gear, the main pinion and the main gear of the two-stage full double helical gear transmission structure of the press. In this process, the gear shaft can produce axial movement, and in the process of axial movement, the gear shaft and the intermediate gear realize uniform meshing of the teeth on both sides of the gear, that is, the gear shaft offsets the machining and assembly errors of the double helical gear in the two-stage full double helical gear transmission structure through axial movement, and automatic alignment is realized. The integrated transmission shaft driving device can realize direct drive servo transmission without increasing additional reduction mechanism, and has simple structure; the servo technology and the traditional mechanical press full double helical gear transmission technology are combined, and the transmission performance of the servo press is improved to a certain extent.

[0009] Optionally, the transmission shaft driving device further comprises a spline shaft, one end of the gear shaft away from the servo motor is connected with one end of the spline hole of the spline shaft, the gear shaft is used for producing axial movement in the spline sleeve and the spline hole of the spline shaft; one end of the spline shaft away from the gear shaft is used for being connected with the brake through the expansion sleeve, the spline shaft passes through the first bearing installed on the second supporting structure and the second bearing installed on the supporting sleeve; the gear shaft passes through the third bearing installed on the first supporting structure, and the inner ring of the third bearing is used for producing axial displacement relative to the outer ring to allow the gear shaft to produce axial movement.

[0010] Optionally, the gear shaft passes through the third bearing installed on the supporting device, the inner ring of the third bearing is used for producing axial displacement relative to the outer ring to allow the gear shaft to produce axial movement; one end of the gear shaft away from the servo motor is directly connected with the brake, and the gap between the friction discs of the brake is used for allowing the gear shaft to produce axial movement.

[0011] Optionally, the transmission shaft driving device further comprises a first retainer ring, a first locking nut, a first oil slinger and a first steel sleeve, the first retainer ring is installed on the first support structure, and the outer ring of the third bearing is used to be fixed through the first retainer ring; the first oil slinger and the first steel sleeve are both sleeved on the gear shaft, the gear shaft is provided with a first protruding block structure, the first locking nut is used to be screwed on the first protruding block structure, and the first locking nut is used to press the first oil slinger tightly, so as to press the first steel sleeve tightly on the inner ring of the third bearing, so as to fix the inner ring of the third bearing.

[0012] Optionally, the transmission shaft driving device further comprises a second retainer ring, a second locking nut and a second steel sleeve, the second retainer ring is installed on the second support structure, and the outer ring of the first bearing is used to be fixed through the second retainer ring; the second steel sleeve is sleeved on the spline shaft, the spline shaft is provided with a second protruding block structure, the second locking nut is used to be screwed on the second protruding block structure, and the second locking nut is used to press the second steel sleeve tightly, so as to fix the inner ring of the first bearing.

[0013] Optionally, the transmission shaft driving device further comprises a third retainer ring, a third locking nut, a third steel sleeve and a fourth steel sleeve, the third retainer ring is installed on the support sleeve, the outer ring of the second bearing is used to be fixed through the third retainer ring, the third steel sleeve and the fourth steel sleeve are both sleeved on the spline shaft, the spline shaft is provided with a third protruding block structure, the third locking nut is used to be screwed on the third protruding block structure, and the third locking nut is used to press the third steel sleeve tightly, so as to press the fourth steel sleeve tightly on the inner ring of the second bearing, so as to fix the inner ring of the second bearing.

[0014] Optionally, the support device and the first retainer ring are respectively provided with oil inlet holes, the first bearing, the second bearing and the third bearing are used to be lubricated by the oil inlet holes on the support device and the first retainer ring, and the first retainer ring is used to form an oil pool.

[0015] Optionally, the transmission shaft driving device further comprises a first sealing ring, a second sealing ring and a second oil slinger, the second oil slinger is installed on the first support structure, the first sealing ring is installed between the second oil slinger and the first support structure, and the second sealing ring is sleeved on the gear shaft; the sealing of the lubricating oil of the third bearing is achieved through the first sealing ring, the second sealing ring and the mechanical seal composed of the first oil slinger and the second oil slinger.

[0016] Optionally, the transmission shaft driving device further comprises a third sealing ring, a fourth sealing ring, two fourth blocking rings and two rotary oil seals, the third sealing ring is sleeved on the spline shaft, the fourth sealing ring is installed between the second support structure and the support sleeve, the two fourth blocking rings and the two rotary oil seals are installed on the support sleeve, and the sealing of the lubricating oil of the first bearing and the second bearing is realized by the third sealing ring, the fourth sealing ring and the two rotary oil seals fixed by the two fourth blocking rings.

[0017] Optionally, the third bearing is an N type single row cylindrical roller bearing. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 Structure diagram of the transmission shaft driving device of the embodiment of the present application Figure 1 ;

[0019] Figure 2 Cutaway view of the embodiment of the present application Figure 1 ;

[0020] Figure 3 Local enlarged view of A in the embodiment of the present application Figure 2 ;

[0021] Figure 4 Local enlarged view of B in the embodiment of the present application Figure 2 ;

[0022] Figure 5 Principle diagram of the transmission shaft driving device of the embodiment of the present application and two-stage full double helical gear transmission

[0023] Figure 6 Structure diagram of the transmission shaft driving device of the embodiment of the present application Figure 2 ;

[0024] BRIEF DESCRIPTION OF DRAWINGS

[0025] 1, servo motor; 2, spline sleeve; 4, second oil slinger; 5, first sealing ring; 6, first blocking ring; 7, first locking nut; 8, first oil slinger; 9, second sealing ring; 10, first steel sleeve; 11, third bearing; 12, gear shaft; 13, spline shaft; 14, first bearing; 15, second blocking ring; 16, second steel sleeve; 17, second locking nut; 18, third blocking ring; 19, second bearing; 20, fourth steel sleeve; 21, third steel sleeve; 22, rotary oil seal; 23, fourth blocking ring; 24, fourth sealing ring; 25, support sleeve; 26, brake; 27, expansion sleeve; 28, third locking nut; 29, third sealing ring; 31, first support structure; 32, second support structure. DETAILED DESCRIPTION

[0026] In order to make the above objectives, characteristics and advantages of the present application more apparent, concrete embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0027] In the description of the present application, the orientation or positional relationship indicated by "upper", "lower", "left", "right", "top", "bottom", "front", "back", "inner" and "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application, and does not indicate or imply that the device referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the scope of protection of the present application.

[0028] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "arrange", "mount", "connect", "connect" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0029] In the description of the present application, the description of the terms "embodiment", "one embodiment" and "one implementation" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or implementation are included in at least one embodiment or implementation of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or implementation. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or implementations in a suitable manner.

[0030] Moreover, in the drawings, the X-axis represents the transverse direction, that is, the left and right positions, and the positive direction of the X-axis, that is, the direction of the arrow of the X-axis, represents the left, and the negative direction of the X-axis, that is, the direction opposite to the positive direction of the X-axis, represents the right.

[0031] It should be noted that the meaning of the aforementioned X-axis is only for the convenience of describing the present application and simplifying the description, and is not indicative or implied that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0032] As Figures 1 to 2As shown, the transmission shaft driving device of the embodiment of the present application is applied to two-stage full double-helical gear transmission of a direct drive type servo press, and comprises a supporting device, a servo motor 1, a brake 26 and a gear shaft 12, wherein the supporting device is used for being mounted on an upper beam body of the press, and comprises a first supporting structure 31 and a second supporting structure 32 which are arranged at intervals; the servo motor 1 is mounted on the first supporting structure 31; the brake 26 is mounted on the second supporting structure 32 through a supporting sleeve 25; a spline end of the gear shaft 12 is drivingly connected with the servo motor 1 through a spline sleeve 2 mounted on the servo motor 1, and the other end is used for being connected with the brake 26; the gear shaft 12 is used for generating axial displacement in a working process, so that the gear shaft 12 and an intermediate gear 100 in the two-stage full double-helical gear transmission are uniformly meshed on both sides of the gear.

[0033] In the embodiment, the accompanying drawings are combined Figure 5 As shown, the transmission shaft driving device is applied to two-stage full double-helical gear transmission of a direct drive type servo press, and specifically, a two-stage full double-helical gear transmission structure of the press comprises an intermediate gear 100, a main pinion 200 and a main gear 300, the main gear 300, the main pinion 200 and the intermediate gear 100 are sequentially drivingly connected, and all adopt double-helical gears for transmission; the intermediate gear 100 is mounted on an axial end of the main pinion 200, and is used for playing a transmission role between a transmission shaft assembly of the transmission shaft driving device and the main pinion 200, specifically, a gear shaft 12 of the transmission shaft driving device is a double-helical gear shaft, that is, an outer periphery of the gear shaft 12 is sleeved with a double-helical gear, and a double-helical gear of the intermediate gear 100 is meshed with the double-helical gear sleeved on the outer periphery of the gear shaft 12, so as to realize transmission.

[0034] In the embodiment, the accompanying drawings are combined Figure 1 and the accompanying drawings are combined Figure 2 As shown, the device can be mounted on an upper beam body of the press through the supporting device, the servo motor 1 can drive the gear shaft 12 to rotate through the spline sleeve 2, that is, the servo motor 1 as a power source can drive the gear shaft 12 to rotate, and the reciprocating motion of a slider of the press is realized through two-stage gear transmission of the intermediate gear 100, the main pinion 200 and the main gear 300 of the two-stage full double-helical gear transmission structure of the press by the gear shaft 12. In this process, the gear shaft 12 can generate axial displacement, and in the process of axial displacement, the gear shaft 12 and the intermediate gear 100 are uniformly meshed on both sides of the gear, that is, the gear shaft 12 offsets the machining and assembly errors of the double-helical gears in the two-stage full double-helical gear transmission structure through axial displacement, and automatic centering is realized. The transmission shaft driving device of the present application can realize direct drive type servo transmission without increasing an additional reduction mechanism, and the structure is simple; the servo technology and the traditional mechanical press full double-helical gear transmission technology can be combined, and the transmission performance of the servo press is improved to a certain extent.

[0035] In the aforementioned work process, the support device can be an integral box-shaped welded structure used to fix it to the upper beam body of the press.

[0036] Optionally, the drive shaft device further includes a splined shaft 13, with the end of the gear shaft 12 away from the servo motor 1 connected to the end of the splined shaft 13 where the spline hole is located. The gear shaft 12 is used to generate axial movement within the splined sleeve 2 and the spline hole of the splined shaft 13. The end of the splined shaft 13 away from the gear shaft 12 is used to connect to the brake 26 via a shrink sleeve 27. The splined shaft 13 passes through a first bearing 14 mounted on the second support structure 32 and a second bearing 19 mounted on the support sleeve 25. The gear shaft 12 passes through a third bearing 11 mounted on the first support structure 31, and the inner ring of the third bearing 11 is used to generate axial displacement relative to the outer ring to allow the gear shaft 12 to generate axial movement.

[0037] In this embodiment, in conjunction with the appendix Figure 5 As shown, the two-stage herringbone gear transmission structure of the press includes an intermediate gear 100, a main pinion 200, and a main gear 300. The intermediate gear 100 is mounted on the shaft end of the main pinion 200, serving as the transmission mechanism between the gear shaft of this drive shaft device and the main pinion 200. (See attached diagram.) Figures 2 to 4 As shown, this drive shaft device can be a split drive shaft structure (gear shaft 12 and spline shaft 13). The servo motor 1 drives the gear shaft 12 to rotate. The end of the gear shaft 12 near the spline shaft 13 is connected to the spline hole end of the spline shaft 13, serving a transmission function. That is, the servo motor 1 acts as a power source, driving the gear shaft 12 and spline shaft 13 to rotate. The reciprocating motion of the press slide is achieved through the two-stage gear transmission structure of the press, consisting of the intermediate gear 100, the main pinion 200, and the main gear 300. During this process, the gear shaft can axially move within the spline sleeve 2 mounted on the servo motor 1 and the spline hole of the spline shaft 13. This axial movement ensures uniform meshing of the gear teeth on both sides of the gear shaft 12 and the intermediate gear 100. In other words, the axial movement of the gear shaft 12 compensates for machining and assembly errors of the herringbone gears in the two-stage herringbone gear transmission structure, achieving automatic self-alignment.

[0038] In the above-mentioned work process, combined with the attached Figure 1 As shown, the right end of spline shaft 13 (attached) Figure 1 The spline shaft 13 (in the X-axis direction) can be connected to the brake 26 via the expansion sleeve 27. The brake 26 is used to stop or decelerate the spline shaft 13, thus providing a safety braking function for the drive shaft of this transmission shaft.

[0039] Optionally, the gear shaft 12 passes through a third bearing 11 mounted on the support device, the inner ring of the third bearing 11 being used to generate axial displacement relative to the outer ring, so as to allow the gear shaft 12 to generate axial movement; the end of the gear shaft 12 away from the servo motor 1 is directly connected to the brake 26, and the gap between the friction discs of the brake 3 is used to allow the gear shaft 12 to generate axial movement.

[0040] In this embodiment, in conjunction with the appendix Figure 6 As shown, this drive shaft device can be an integrated drive shaft structure (gear shaft 12). A third bearing 11 is installed on both the first support structure 31 and the second support structure 32. Specifically, the third bearing 11 can be an N-type single-row cylindrical roller bearing to accommodate the axial movement of the gear shaft 12. During operation, the gear shaft 12 will experience axial movement. The clearance between the friction discs of the brake 3 (the clearance between the active friction disc and the passive friction disc) must allow for a certain amount of axial movement of the gear shaft 12 to ensure that the braking effect of the brake 3 is not affected. It should be noted that the transmission method of the integrated drive shaft structure is the same as that of the two-stage full herringbone gear transmission structure and the split drive shaft structure, and will not be described further here.

[0041] Optionally, the transmission shaft drive device further includes a first retaining ring 6, a first locking nut 7, a first oil slinger ring 8, and a first steel sleeve 10. The first retaining ring 6 is installed on the first support structure 31, and the outer ring of the third bearing 11 is fixed by the first retaining ring 6. The first oil slinger ring 8 and the first steel sleeve 10 are both sleeved on the gear shaft 12. The gear shaft 12 is provided with a first protrusion structure. The first locking nut 7 is threaded onto the first protrusion structure, and the first locking nut 7 is used to press against the first oil slinger ring 8 to press the first steel sleeve 10 against the inner ring of the third bearing 11 to fix the inner ring of the third bearing 11.

[0042] In this embodiment, in conjunction with the appendix Figure 2 As shown, the third bearing 11 can be an N-type single-row cylindrical roller bearing. Its outer ring can be fixed by the first retaining ring 6, and its inner ring can be fixed by the first locking nut 7, the first oil slinger ring 8, and the first steel sleeve 10. (See attached diagram.) Figure 2 As shown, a first protrusion structure is provided on the circumferential outer wall of the gear shaft 12, and the first protrusion structure is provided with a thread that is compatible with the first locking nut 7. The first locking nut 7 is used to screw the first protrusion structure toward the direction close to the first oil slinger ring 8 and the first steel sleeve 10, and to tighten it, so that the first steel sleeve 10 locks the inner ring of the third bearing 11.

[0043] It should be noted that, in conjunction with the appendix Figure 6As shown, the lubricating oil sealing structure of the two third bearings 11 installed on the support device and the fixing mode of the bearing inner ring are the same as above, and will not be described here again.

[0044] Optionally, the transmission shaft driving device further comprises a second retainer ring 15, a second locking nut 17 and a second steel sleeve 16, the second retainer ring 15 is installed on the second support structure 32, and the outer ring of the first bearing 14 is fixed by the second retainer ring 15; the second steel sleeve 16 is sleeved on the spline shaft 13, the spline shaft 13 is provided with a second protruding structure, the second locking nut 17 is threadedly connected on the second protruding structure, and the second locking nut 17 is used to tightly press the second steel sleeve 16, so as to fix the inner ring of the first bearing 14.

[0045] In this embodiment, the second protruding structure is provided on the circumferential outer wall of the spline shaft 13, and a thread matched with the second locking nut 17 is formed in the second protruding structure. Figure 3 As shown, the first bearing 14 can be a self-aligning roller bearing, the outer ring of which is fixed by the second retainer ring 15, and the inner ring of which is fixed by the second steel sleeve 16 and the second locking nut 17. Figure 3 As shown, the second protruding structure is provided on the circumferential outer wall of the spline shaft 13, and a thread matched with the second locking nut 17 is formed in the second protruding structure.

[0046] Optionally, the transmission shaft driving device further comprises a third retainer ring 18, a third locking nut 28, a third steel sleeve 21 and a fourth steel sleeve 20, the third retainer ring 18 is installed on the support sleeve 25, and the outer ring of the second bearing 19 is fixed by the third retainer ring 18, the third steel sleeve 21 and the fourth steel sleeve 20 are both sleeved on the spline shaft 13, the spline shaft 13 is provided with a third protruding structure, the third locking nut 28 is threadedly connected on the third protruding structure, and the third locking nut 28 is used to tightly press the third steel sleeve 21, so as to tightly press the fourth steel sleeve 20 on the inner ring of the second bearing 19, so as to fix the inner ring of the second bearing 19.

[0047] In this embodiment, the third protruding structure is provided on the circumferential outer wall of the spline shaft 13, and a thread matched with the third locking nut 28 is formed in the third protruding structure. Figure 3 As shown, the second bearing 19 is fixed by the third retainer ring 18, and the inner ring of the second bearing 19 is fixed by the third steel sleeve 21, the fourth steel sleeve 20 and the third locking nut 28. Figure 3As shown, a third protrusion structure is arranged on the circumferential outer wall of the spline shaft 13, and a thread compatible with the third locking nut 28 is arranged on the third protrusion structure. The third locking nut 28 is used to be screwed on the third protrusion structure towards the direction close to the third steel sleeve 21 and the fourth steel sleeve 20, and is tightly pressed, so that the fourth steel sleeve 20 tightly presses the inner ring of the second bearing 19.

[0048] Optionally, the support device and the first retainer ring 6 are respectively provided with an oil inlet hole, and the first bearing 14, the second bearing 19 and the third bearing 11 are lubricated by the oil inlet hole of the support device and the first retainer ring 6, and the first retainer ring 6 is used to form an oil pool.

[0049] In this embodiment, the first bearing 14, the second bearing 19 and the third bearing 11 are continuously lubricated by the support device and the oil inlet hole of the first retainer ring 6 during operation. Figures 1 to 3 As shown, the first bearing 14, the second bearing 19 and the third bearing 11 are continuously lubricated by the support device and the oil inlet hole of the first retainer ring 6 during operation, and the structure of the first retainer ring 6 forms an oil pool, so that the bearing is fully lubricated.

[0050] Optionally, the transmission shaft driving device further comprises a first sealing ring 5, a second sealing ring 9 and a second oil throwing ring 4, the second oil throwing ring 4 is installed on the first support structure 31, the first sealing ring 5 is installed between the second oil throwing ring 4 and the first support structure 31, and the second sealing ring 9 is sleeved on the gear shaft 12. The sealing of the lubricating oil of the third bearing 11 is achieved by the first sealing ring 5, the second sealing ring 9 and the mechanical seal composed of the first oil throwing ring 8 and the second oil throwing ring 4.

[0051] Optionally, the transmission shaft driving device further comprises a third sealing ring 29, a fourth sealing ring 24, two fourth retainer rings 23 and two rotary oil seals 22, the third sealing ring 29 is sleeved on the spline shaft 13, the fourth sealing ring 24 is installed between the second support structure 32 and the support sleeve 25, two fourth retainer rings 23 and two rotary oil seals 22 (back-to-back installation) are installed on the support sleeve 25, and the sealing of the lubricating oil of the first bearing 14 and the second bearing 19 is achieved by the third sealing ring 29, the fourth sealing ring 24 and the two rotary oil seals 22 fixed by the two fourth retainer rings 23.

[0052] It should be noted that the excess lubricating oil can enter the upper beam body through the bearing gap, the second oil throwing ring 4 and the oil return hole on the support device.

[0053] Optionally, the first bearing 14 is a self-aligning roller bearing, and the second bearing 19 is a double-row cylindrical roller bearing.

[0054] In the embodiment, the first bearing 14 and the second bearing 19 are used to support the spline shaft 13. The first bearing 14 is preferably a self-aligning roller bearing, which has double rows of rollers, an outer ring with one common spherical raceway, and an inner ring with two raceways and inclined at an angle to the bearing axis. This ingenious construction makes it have the self-aligning performance, so it is not easy to be affected by the angle error of the shaft and the bearing box seat or the shaft bending, and is suitable for the occasion where the angle error is caused by the installation error or the shaft deflection. The second bearing 19 is preferably a double-row cylindrical roller bearing, which has two structures of a cylindrical inner hole and a conical inner hole. The bearing has the advantages of compact structure, large rigidity, large carrying capacity, small deformation after being subjected to load, and the like. The conical inner hole can also play the role of slightly adjusting the clearance, and can simplify the structure of the positioning device and facilitate installation and disassembly.

[0055] Optionally, the third bearing 11 is an N-type single-row cylindrical roller bearing.

[0056] In the embodiment, the third bearing 11 is used to support the gear shaft 12, and the third bearing 11 is preferably an N-type single-row cylindrical roller bearing, that is, a cylindrical roller bearing without a retaining ring on the inner ring or the outer ring. The inner ring and the outer ring can relatively move in the axial direction to allow the gear shaft 12 to produce axial movement.

[0057] The terms "first", "second", "third", etc. are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implying the number of the technical features indicated. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include at least one of the features.

[0058] Although the present application is disclosed as above, the protection scope of the present application is not limited to this. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application, and these changes and modifications will fall within the protection scope of the present application.

Claims

1. A drive shaft drive device, applied to a two-stage all-herringbone gear drive in a direct-drive servo press, characterized in that, The transmission shaft driving device comprises a support device, a servo motor (1), a brake (26) and a gear shaft (12), the support device is used for being mounted on an upper beam body of a press machine, and the support device comprises first and second support structures (31, 32) which are arranged at intervals; the servo motor (1) is mounted on the first support structure (31); the brake (26) is mounted on the second support structure (32) through a support sleeve (25); a spline end of the gear shaft (12) is drivingly connected with the servo motor (1) through a spline sleeve (2) mounted on the servo motor (1), and the other end is used for being connected with the brake (26); the gear shaft (12) is used for generating axial displacement during work, so that the gear shaft (12) and the intermediate gear in the two-stage full-helical gear realize uniform meshing of teeth on both sides of the gear; the transmission shaft driving device further comprises a spline shaft (13), an end of the gear shaft (12) away from the servo motor (1) is connected with an end of the spline shaft (13) where a spline hole is located, and the gear shaft (12) is used for generating axial displacement in the spline sleeve (2) and the spline hole of the spline shaft (13); an end of the spline shaft (13) away from the gear shaft (12) is used for being connected with the brake (26) through an expansion sleeve (27), the spline shaft (13) passes through a first bearing (14) mounted on the second support structure (32) and a second bearing (19) mounted on the support sleeve (25); the gear shaft (12) passes through a third bearing (11) mounted on the first support structure (31), and an inner ring of the third bearing (11) is used for generating axial displacement relative to an outer ring, so as to allow the gear shaft (12) to generate axial displacement; the gear shaft (12) passes through the third bearing (11) mounted on the support device, an inner ring of the third bearing (11) is used for generating axial displacement relative to an outer ring, so as to allow the gear shaft (12) to generate axial displacement; an end of the gear shaft (12) away from the servo motor (1) is directly connected with the brake (26), and an inter-gap of friction discs of the brake (26) is used for allowing the gear shaft (12) to generate axial displacement; the transmission shaft driving device further comprises a first retainer ring (6), a first locking nut (7), a first oil slinger (8) and a first steel sleeve (10), the first retainer ring (6) is mounted on the first support structure (31), and an outer ring of the third bearing (11) is fixed by the first retainer ring (6); the first oil slinger (8) and the first steel sleeve (10) are both sleeved on the gear shaft (12), a first protruding block structure is arranged on the gear shaft (12), the first locking nut (7) is used for being threadedly connected on the first protruding block structure, and the first locking nut (7) is used for tightly pressing the first oil slinger (8), so as to tightly press the first steel sleeve (10) on an inner ring of the third bearing (11), so as to fix the inner ring of the third bearing (11).

2. The drive shaft drive device according to claim 1, characterized in that, It also includes a second retaining ring (15), a second locking nut (17), and a second steel sleeve (16). The second retaining ring (15) is installed on the second support structure (32), and the outer ring of the first bearing (14) is fixed by the second retaining ring (15). The second steel sleeve (16) is sleeved on the spline shaft (13), and the spline shaft (13) is provided with a second protrusion structure. The second locking nut (17) is threaded to the second protrusion structure, and the second locking nut (17) is used to press against the second steel sleeve (16) to fix the inner ring of the first bearing (14).

3. The drive shaft drive device according to claim 1, characterized in that, It also includes a third retaining ring (18), a third locking nut (28), a third steel sleeve (21), and a fourth steel sleeve (20). The third retaining ring (18) is installed on the support sleeve (25). The outer ring of the second bearing (19) is fixed by the third retaining ring (18). The third steel sleeve (21) and the fourth steel sleeve (20) are both sleeved on the spline shaft (13). The spline shaft (13) is provided with a third protrusion structure. The third locking nut (28) is used to be threaded onto the third protrusion structure. The third locking nut (28) is used to press against the third steel sleeve (21) to press the fourth steel sleeve (20) against the inner ring of the second bearing (19) to fix the inner ring of the second bearing (19).

4. The drive shaft drive device according to claim 1, characterized in that, The support device and the first retaining ring (6) are respectively provided with oil inlet holes. The first bearing (14), the second bearing (19) and the third bearing (11) are used for oil injection and lubrication through the oil inlet holes on the support device and the first retaining ring (6), and the first retaining ring (6) is used to form an oil pool.

5. The drive shaft drive device according to claim 1, characterized in that, It also includes a first sealing ring (5), a second sealing ring (9), and a second oil slinger ring (4). The second oil slinger ring (4) is installed on the first support structure (31). The first sealing ring (5) is installed between the second oil slinger ring (4) and the first support structure (31). The second sealing ring (9) is sleeved on the gear shaft (12). The sealing of the lubricating oil of the third bearing (11) is achieved by the first sealing ring (5), the second sealing ring (9), and the mechanical seal composed of the first oil slinger ring (8) and the second oil slinger ring (4).

6. The drive shaft drive device according to claim 1, characterized in that, It also includes a third sealing ring (29), a fourth sealing ring (24), two fourth retaining rings (23), and two rotary oil seals (22). The third sealing ring (29) is sleeved on the spline shaft (13). The fourth sealing ring (24) is installed between the second support structure (32) and the support sleeve (25). The two fourth retaining rings (23) and the two rotary oil seals (22) are all installed on the support sleeve (25). The sealing of the lubricating oil of the first bearing (14) and the second bearing (19) is achieved by the four parts: the third sealing ring (29), the fourth sealing ring (24), and the two rotary oil seals (22) fixed by the two fourth retaining rings (23).

7. The drive shaft drive device according to claim 1, characterized in that, The third bearing (11) is an N-type single-row cylindrical roller bearing.

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