Workpiece spindle device for a gear grinding machine

Abstract

The utility model discloses a kind of internal gear gear grinding machine workpiece main shaft device, comprising: worm gear mechanism, and worm mechanism, wherein, the worm gear mechanism includes: workpiece main shaft, workpiece main shaft box is installed on the workpiece main shaft, index worm wheel is installed on the workpiece main shaft;The worm mechanism includes: double floating worm, the double floating worm is engaged with the index worm wheel, the end of the double floating worm is connected with power mechanism, and the power mechanism is installed on the workpiece main shaft box. By designing a set of meshing side gap adjustable high-precision double floating worm gear mechanism inside headstock, the precision of main shaft can be adjusted during working process, so that transmission efficiency is high, can bear larger load and torque, realize smooth transmission, and adjustment is simple, convenient for later maintenance.

Description

Technical Field

[0001] This utility model relates to the field of gear grinding machine technology, and in particular to a workpiece spindle device for an internal gear grinding machine. Background Technology

[0002] In existing technologies, the workpiece spindle of internal gear grinding machines mostly adopts a single-lead worm gear drive, with a servo motor directly connected to the worm, driving the worm gear to rotate and thus rotating the workpiece spindle on it. The front and rear ends of the spindle mostly use angular contact ball bearings, and the two ends are sealed with a single labyrinth seal. The main drawbacks of this structure are low load capacity, poor rigidity, low transmission efficiency, poor sealing effect, easy mixing of iron filings into the lubricating oil, and low processing efficiency.

[0003] Furthermore, existing internal gear grinding machines still use a torque motor to directly drive the headstock indexing and rotation of the workpiece spindle. The stator is installed inside the headstock housing, and the rotor is mounted on the workpiece spindle to drive its rotation. The front end of the spindle is supported by a spindle bearing and sealed with a skeleton oil seal, while the rear end bearing is free-floating, and a circular grating feedback element is installed behind it. The main drawback of this structure is that the rear end bearing lacks auxiliary support, and during gear grinding, even a slight runout error of the spindle is easily transmitted to the circular grating, resulting in poor overall dynamic rigidity of the headstock and affecting machining accuracy and efficiency. Utility Model Content

[0004] In view of the above-mentioned defects or deficiencies, the purpose of this utility model is to provide a workpiece spindle device for an internal gear grinding machine, so as to solve the problems of poor structural rigidity, low transmission efficiency and poor accuracy retention in the prior art.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] A workpiece spindle device for an internal gear grinding machine includes a worm gear mechanism and a worm mechanism. The worm gear mechanism includes a workpiece spindle with a workpiece spindle housing mounted on it, and an indexing worm gear mounted on the workpiece spindle. The worm mechanism includes a double-lead worm gear meshing with the indexing worm gear, and a power mechanism connected to the end of the double-lead worm gear, the power mechanism being mounted on the workpiece spindle housing.

[0007] The workpiece spindle has an indexing worm gear installed in the middle; a front tapered roller bearing and a front pressure sleeve are installed at the front end of the workpiece spindle housing; a rear tapered roller bearing is installed at the rear end of the workpiece spindle housing, and the workpiece spindle rotates within the front and rear tapered roller bearings.

[0008] A shim is installed on the indexing worm gear, and the shim is installed by pressing it with an end cap.

[0009] The front end pressure sleeve is equipped with a first adjusting shim, a dust seal, and a first skeleton oil seal for adjusting the center of the indexing worm gear. A front end pressure cover is pressed and installed on the front end pressure sleeve.

[0010] A bearing sleeve is installed at the rear end of the workpiece spindle. A second adjusting shim for adjusting the bearing load and spindle rotation accuracy is installed inside the bearing sleeve. A hydraulic cylinder sealing mechanism is installed outside the bearing sleeve. A rear end cover is installed on the hydraulic cylinder sealing mechanism by screws. The hydraulic cylinder sealing mechanism injects hydraulic oil to press the friction disc locking mechanism for indexing and clamping. An encoder is installed on the rear end cover. The encoder is connected to a coupling via a flange installed at the rear end of the workpiece spindle.

[0011] The cylinder sealing mechanism includes: a cylinder sleeve installed outside the bearing sleeve, on which a second skeleton oil seal, an O-ring, a lock nut, and a second washer are installed; a spring is installed on the lock nut.

[0012] The rear end of the workpiece spindle housing is equipped with a protective cover for protection.

[0013] The power mechanism includes a servo motor, which is connected to the workpiece spindle housing via a connecting flange, and the connecting shaft end of the servo motor is connected to the double-lead worm gear via a flat coupling.

[0014] The upper end of the double-lead worm gear is provided with an upper bearing sleeve, which is fastened to the workpiece spindle housing by screws. The upper bearing sleeve is equipped with a first radial needle roller and cage assembly, a hole spacer, and a hole spacer. The upper bearing sleeve is provided with a skeleton oil seal for sealing the front end of the worm gear.

[0015] The lower end of the double-lead worm gear is provided with a lower bearing sleeve, and a second radial needle roller and cage assembly, a thrust cylindrical roller and cage assembly are installed inside the lower bearing sleeve. The upper end of the thrust cylindrical roller and cage assembly is provided with an upper thrust bearing washer, and the lower end of the thrust cylindrical roller and cage assembly is provided with a lower thrust bearing washer, a lock nut, a rear end spacer, and a worm gear adjusting shim. The end of the double-lead worm gear is provided with a rear end cap that is connected and sealed to the lower bearing sleeve.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] This utility model provides a workpiece spindle device for an internal gear grinding machine. By designing a high-precision double-lead worm gear mechanism with adjustable meshing backlash inside the headstock, the accuracy of the spindle can be adjusted during operation, resulting in high transmission efficiency, the ability to withstand large loads and torques, smooth transmission, and easy adjustment, facilitating later maintenance.

[0018] Furthermore, the indexing worm gear is mounted on the workpiece spindle, with a set of tapered roller bearings at both ends and a reasonably arranged span between the two bearings, improving the geometric accuracy of the spindle and increasing rigidity during gear grinding. The front end of the spindle features a dustproof oil seal and a skeleton oil seal for double sealing, while the rear end has a skeleton oil seal to effectively prevent lubricant leakage. A hydraulic locking mechanism at the rear end of the spindle enables indexing clamping, and a high-precision angle encoder provides feedback, improving the spindle speed, dynamic response speed, and motion accuracy of the headstock components. The double-lead worm gear meshing with the indexing worm gear has bearing sleeves at both ends to support the bearings, and a skeleton oil seal and sealing cap are used for sealing. In summary, this design improves transmission efficiency, sealing performance, and machining accuracy, effectively ensuring precision stability. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the workpiece spindle device of the internal gear grinding machine of this utility model;

[0020] Figure 2 This is a schematic diagram of the workpiece spindle structure of this utility model.

[0021] In the diagram, 1—Workpiece spindle housing; 2—Workpiece spindle; 3—First adjusting shim; 4—Front end sleeve; 5—Dust seal; 6—Front end cover; 7—First skeleton oil seal; 8—Taply rolled roller bearing; 9—Indexing worm gear; 10—First shim; 11—Taply rolled roller bearing; 12—Skeleton oil seal; 13—Second adjusting shim; 14—Friction lining; 15—Second shim; 16—Screw; 17—Encoder mounting base; 18—Protective cover; 19—Coupling; 20—Encoder; 21—Flange; 22—Second skeleton oil seal; 23—Locking nut; 24—Rear end cover; 25—Spring; 26—O-ring; 27—Friction disc; 28—Cylinder liner; 29—Bearing sleeve; 30—End cover; 31—Servo motor; 32—Flat coupling; 33—Connecting flange; 34—Upper bearing sleeve; 35—Bore spacer; 36—Double-lead worm gear; 37—Lower bearing sleeve; 38—Second radial needle roller and cage assembly; 39—Upper thrust bearing washer; 40—Thrust cylindrical roller and cage assembly; 41—Lower thrust bearing washer; 42—Locking nut; 43—Worm gear adjusting shim; 44—Rear end spacer; 45—Rear end cover; 46—First radial needle roller and cage assembly; 47—Bore spacer; 48—Skeleton oil seal. Detailed Implementation

[0022] The present invention will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the protection scope of the present invention.

[0023] like Figure 1 , 2 As shown, this utility model provides a workpiece spindle device for an internal gear grinding machine, characterized by comprising: a worm gear mechanism and a worm mechanism. The worm gear mechanism includes: a workpiece spindle 2, on which a workpiece spindle housing 1 is mounted, and an indexing worm gear 9 is mounted. The worm mechanism includes: a double-lead worm 36, which meshes with the indexing worm gear 9. A power mechanism is connected to the end of the double-lead worm 36, and the power mechanism is mounted on the workpiece spindle housing 1. A set of high-precision double-lead worm gears with adjustable meshing backlash is staggered within the headstock housing, and adjusting shims are installed at the rear end of the worm to adjust the meshing backlash.

[0024] Specifically, the indexing worm gear 9 is installed in the middle of the workpiece spindle 2; a front tapered roller bearing 8 and a front pressure sleeve 4 are installed at the front end of the workpiece spindle housing 1; a rear tapered roller bearing 11 is installed at the rear end of the workpiece spindle housing 1, and the workpiece spindle 2 rotates within the front tapered roller bearing 8 and the rear tapered roller bearing 11. A first shim 10 is installed on the indexing worm gear 9, and the first shim 10 is pressed and installed by the end cover 30.

[0025] The front end pressure sleeve 4 is equipped with a first adjusting shim 3, a dust seal 5, and a first skeleton oil seal 7 for adjusting the center of the indexing worm gear 9. A front end pressure cover 6 is pressed and installed on the front end pressure sleeve 4.

[0026] In this invention, a bearing sleeve 29 is installed at the rear end of the workpiece spindle 2. A second adjusting shim 13 for adjusting bearing load and spindle rotation accuracy is installed inside the bearing sleeve 29. A hydraulic cylinder sealing mechanism is installed outside the bearing sleeve 29. A rear end cover 24 is installed on the hydraulic cylinder sealing mechanism via screws 16. The hydraulic cylinder sealing mechanism injects hydraulic oil to press and clamp the friction disc locking mechanism for indexing. An encoder 20 is installed on the rear end cover 24. The encoder 20 is connected to a coupling 19 via a flange 21 installed at the rear end of the workpiece spindle 2. The encoder 20 is connected to a high-precision angle encoder via a flat coupling to achieve dynamic feedback.

[0027] Specifically, the cylinder sealing mechanism includes: a cylinder sleeve 28 installed outside the bearing sleeve 29; a second skeleton oil seal 22, an O-ring 26, a locking nut 23, and a second washer 15 are installed on the cylinder sleeve 28; a spring 25 is installed on the locking nut 23. The friction disc locking mechanism is installed at the rear end of the workpiece spindle 2; the cylinder sleeve 28 is provided with an oil hole to squeeze the friction disc and the pressure cap, and the spindle indexing and clamping function is realized by the force of screws and springs. Preferably, a protective cover 18 for protection is installed at the rear end of the workpiece spindle housing 1. Figure 2 As shown, the friction disc locking mechanism has an oil filling hole on the outer circle of the cylinder sleeve 28. When oil is supplied, the rear end cover 24 and the friction disc 27 are pressed together to act on the friction plate 14, press the screw 16, the second washer 15 and the locking nut 23, and compress the spring 25 to achieve the clamping function when the spindle is indexed. The mechanism is a friction disc locking mechanism.

[0028] In this utility model, the power mechanism includes a servo motor 31, which is connected to the workpiece spindle housing 1 via a connecting flange 33, and the connecting shaft end of the servo motor 31 is connected to the double-lead worm gear 36 via a flat coupling 32.

[0029] Furthermore, an upper bearing sleeve 34 is provided at the upper end of the double-lead worm gear 36. The upper bearing sleeve 34 is fastened to the workpiece spindle housing 1 by screws. A first radial needle roller and cage assembly 46, a hole spacer 35, and a hole spacer 47 are installed inside the upper bearing sleeve 34. A skeleton oil seal 48 for sealing the front end of the worm gear is provided outside the upper bearing sleeve 34. The lower end of the double-lead worm gear 36 is provided with a lower bearing sleeve 37. A second radial needle roller and cage assembly 38 and a thrust cylindrical roller and cage assembly 40 are installed inside the lower bearing sleeve 37. An upper thrust bearing washer 39 is provided at the upper end of the thrust cylindrical roller and cage assembly 40, and a lower thrust bearing washer 41, a lock nut 42, a rear end spacer 44, and a worm gear adjusting shim 43 are provided at the lower end of the thrust cylindrical roller and cage assembly 40. A rear end cap 45, which is connected and sealed to the lower bearing sleeve 37, is installed at the end of the double-lead worm gear 36.

[0030] This utility model includes a workpiece spindle housing 1, within which is designed a high-precision double-lead worm gear with adjustable meshing backlash and an oil-immersed lubrication structure. The indexing worm gear 9 is mounted on the workpiece spindle 2. A set of high-precision tapered roller bearings is designed and installed at both ends of the spindle, improving the load characteristics of the spindle components. A reasonable bearing span design ensures accuracy while improving spindle rigidity. The front end of the spindle is designed with a dustproof oil seal and a skeleton oil seal for double sealing, while the rear end has a skeleton oil seal to effectively prevent lubricant leakage. The rear end of the spindle is designed with a hydraulic locking mechanism for indexing clamping, and is connected to a coupling and a high-precision angle encoder for closed-loop control, controlling the spindle's precise and reliable indexing and rotational movements, improving the dynamic motion accuracy of the components. The high-precision double-lead worm gear 36, meshing with the indexing worm gear 9, has bearing sleeves and support bearings at both ends, with sealing structures at both ends. The front end of the worm gear is connected to a motor via a coupling for power drive, and the rear end is designed with adjusting shims to adjust the axial position of the worm gear to ensure correct meshing of the worm gear pair. This workpiece spindle assembly solves many problems of existing internal gear grinding head frame components, such as low load capacity, poor rigidity, poor sealing, low transmission efficiency, and low machining accuracy.

[0031] It will be apparent to those skilled in the art that the above specific examples are merely preferred embodiments of this utility model. Therefore, any improvements or modifications that those skilled in the art may make to certain parts of this utility model still embody the principles of this utility model and achieve its purpose, and all fall within the scope of protection of this utility model.

Claims

1. A workpiece spindle device for an internal gear grinding machine, characterized in that, include: The worm gear mechanism and the worm mechanism, wherein the worm gear mechanism includes: a workpiece spindle (2), a workpiece spindle housing (1) mounted on the workpiece spindle (2), and an indexing worm wheel (9) mounted on the workpiece spindle (2); the worm mechanism includes: a double-lead worm (36), the double-lead worm (36) meshing with the indexing worm wheel (9), and a power mechanism connected to the end of the double-lead worm (36), the power mechanism being mounted on the workpiece spindle housing (1).

2. The workpiece spindle device for an internal gear grinding machine according to claim 1, characterized in that, The workpiece spindle (2) has an indexing worm gear (9) installed in the middle of it; a front tapered roller bearing (8) and a front pressure sleeve (4) are installed at the front end of the workpiece spindle housing (1); a rear tapered roller bearing (11) is installed at the rear end of the workpiece spindle housing (1), and the workpiece spindle (2) rotates within the front tapered roller bearing (8) and the rear tapered roller bearing (11).

3. The workpiece spindle device for an internal gear grinding machine according to claim 2, characterized in that, A first washer (10) is installed on the indexing worm gear (9), and the first washer (10) is pressed and installed by the end cap (30).

4. The workpiece spindle device for an internal gear grinding machine according to claim 2 or 3, characterized in that, The front end pressure sleeve (4) is equipped with a first adjusting shim (3), a dust seal (5) and a first skeleton oil seal (7) for adjusting the center of the indexing worm gear (9). A front end pressure cover (6) is pressed and installed on the front end pressure sleeve (4).

5. The workpiece spindle device for an internal gear grinding machine according to claim 2 or 3, characterized in that, A bearing sleeve (29) is installed at the rear end of the workpiece spindle (2). A second adjusting shim (13) for adjusting the bearing load and spindle rotation accuracy is installed inside the bearing sleeve (29). A hydraulic cylinder sealing mechanism is installed outside the bearing sleeve (29). A rear end cover (24) is installed on the hydraulic cylinder sealing mechanism by screws (16). The hydraulic cylinder sealing mechanism injects hydraulic oil to press the friction disc locking mechanism for indexing and clamping. An encoder (20) is installed on the rear end cover (24). A coupling (19) is installed on the encoder (20) through the flange (21) installed at the rear end of the workpiece spindle (2). The friction disc locking mechanism is an oil hole installed on the hydraulic cylinder sleeve (28) that squeezes the friction disc and the cover.

6. The workpiece spindle device for an internal gear grinding machine according to claim 5, characterized in that, The cylinder sealing mechanism includes: a cylinder sleeve (28) installed outside the bearing sleeve (29), on which a second skeleton oil seal (22), an O-ring (26), a locking nut (23), and a second gasket (15) are installed; and a spring (25) is installed on the locking nut (23).

7. The workpiece spindle device for an internal gear grinding machine according to claim 2, characterized in that, The rear end of the workpiece spindle housing (1) is equipped with a protective cover (18) for protection.

8. The workpiece spindle device for an internal gear grinding machine according to claim 1, characterized in that, The power mechanism includes a servo motor (31), which is connected to the workpiece spindle housing (1) via a connecting flange (33). The connecting shaft end of the servo motor (31) is connected to the double-lead worm gear (36) via a flat coupling (32).

9. The workpiece spindle device for an internal gear grinding machine according to claim 8, characterized in that, The upper end of the double-lead worm gear (36) is provided with an upper bearing sleeve (34), which is fastened to the workpiece spindle housing (1) by screws. The upper bearing sleeve (34) is equipped with a first radial needle roller and cage assembly (46), a hole spacer (35) and a hole spacer (47). The upper bearing sleeve (34) is provided with a skeleton oil seal (48) for sealing the front end of the worm gear.

10. The workpiece spindle device for an internal gear grinding machine according to claim 8 or 9, characterized in that, The lower end of the double-lead worm gear (36) is provided with a lower bearing sleeve (37), and a second radial needle roller and cage assembly (38) and a thrust cylindrical roller and cage assembly (40) are installed inside the lower bearing sleeve (37). The upper end of the thrust cylindrical roller and cage assembly (40) is provided with an upper thrust bearing washer (39), and the lower end of the thrust cylindrical roller and cage assembly (40) is provided with a lower thrust bearing washer (41), a lock nut (42), a rear end spacer (44), and a worm gear adjusting shim (43). The end of the double-lead worm gear (36) is provided with a rear end cap (45) that is connected and sealed to the lower bearing sleeve (37).

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