Gear hobbing machine for gear machining

Abstract

The invention relates to the technical field of gear machining equipment, and discloses a gear hobbing machine for gear machining. The gear hobbing machine comprises a spline shaft milling machine body, a gear hobbing cutter, an indexing exchange gear set and an adjustable gear frame. The spline shaft milling machine body is provided with a hobbing cutter shaft and a workpiece main shaft, and the hobbing cutter is mounted on the hobbing cutter shaft. The indexing exchange gear set comprises an exchange gear A, an exchange gear B, an exchange gear C and an exchange gear D and is used for adjusting the transmission ratio between the hob and a workpiece. The adjustable gear carrier comprises a gear carrier main plate, a sliding bearing seat and an eccentric adjusting sleeve, an arc-shaped guide groove is formed in the gear carrier main plate, the sliding bearing seat is embedded into the arc-shaped guide groove and can slide in the arc direction to achieve large-range adjustment of the center distance, and the eccentric distance exists between the axis of the outer circle face of the eccentric adjusting sleeve and the axis of an inner hole. Micro compensation adjustment of the center distance is achieved by rotating the eccentric adjusting sleeve. Through the combination of the arc-shaped guide groove and the eccentric adjusting sleeve, stepless accurate adjustment of the center distance of the exchange gear is achieved.

Description

Technical Field

[0001] This invention relates to the field of gear processing equipment technology, and more specifically, to a gear hobbing machine for gear processing. Background Technology

[0002] In gearbox production, a mismatch between production capacity and equipment resource allocation is quite common. When the workload of spline shaft milling machines is insufficient and gear hobbing machines cannot meet production needs, it is necessary to seek optimized equipment resource allocation solutions. Spline shaft milling machines and gear hobbing machines share similar machining principles; both utilize the generating motion between the hob and the workpiece to achieve machining. Therefore, there is a technical feasibility in converting spline shaft milling machines into gear hobbing machines.

[0003] In the process of converting a splined shaft milling machine into a gear hobbing machine, it is necessary to add an indexing change gear to the original transmission system to achieve synchronous indexing motion between the hob and the workpiece. The indexing change gear usually adopts a four-wheel structure. When changing the change gear with different tooth number combinations to adapt to workpieces with different tooth numbers, the required center distance of the gear pair changes with the tooth number combination.

[0004] In existing technology, the intermediate shaft is installed using pre-drilled fixed holes in the gear carrier, and the operator selects the installation position from preset holes based on the tooth combination. However, due to the large number of tooth combinations in interchangeable gears and the non-linear distribution of center distance variations, the number and position of preset holes cannot cover all theoretical center distance values. During the installation of some gear combinations, there is a deviation between the preset hole position and the theoretical center distance, necessitating the selection of the closest hole position for compromise installation. When the deviation results in a larger center distance, the gear meshing clearance increases, causing backlash errors during transmission reversal; when the deviation results in a smaller center distance, the gear meshing is too tight, increasing transmission resistance and tooth surface wear. Both situations affect the indexing transmission accuracy and tooth profile machining quality. Summary of the Invention

[0005] This invention provides a gear hobbing machine for gear processing, which solves the technical problem in related technologies that the preset fixed hole positions cannot accurately match the center distance of different combinations of tooth numbers.

[0006] This invention discloses a gear hobbing machine for gear processing, comprising: Splined shaft milling machine body, the splined shaft milling machine body is provided with a hob shaft and a workpiece spindle; A gear hobbing cutter, the gear hobbing cutter being mounted on the hobbing shaft; The indexing exchange gear set includes an exchange gear A mounted on the input shaft, an exchange gear D mounted on the output shaft, and exchange gears B and C mounted on the intermediate shaft. The exchange gear A and the exchange gear B mesh to form an AB gear pair, and the exchange gear C and the exchange gear D mesh to form a CD gear pair. An adjustable gear carrier includes a gear carrier main board, a sliding bearing seat, and an eccentric adjustment sleeve. The gear carrier main board is provided with an A-axis mounting hole for mounting the input shaft, a D-axis mounting hole for mounting the output shaft, and an arc-shaped guide groove. The sliding bearing seat is embedded in the arc-shaped guide groove and can slide along the arc direction. The eccentric adjustment sleeve is mounted on the sliding bearing seat. The outer circular surface axis of the eccentric adjustment sleeve is parallel to the inner hole axis and has an eccentricity. The intermediate shaft is mounted in the inner hole of the eccentric adjustment sleeve. The eccentric adjustment sleeve can rotate around its outer circular surface axis to adjust the axial position of the intermediate shaft.

[0007] Furthermore, the arc-shaped guide groove is centered on the axis of the A-axis mounting hole, and the arc-shaped guide groove extends through the thickness direction of the gear carrier main plate to form a through groove structure.

[0008] Furthermore, the bottom of the sliding bearing seat is provided with a guide boss, the outer contour of the guide boss and the inner contour of the arc-shaped guide groove are in clearance fit, and the guide boss is embedded in the arc-shaped guide groove.

[0009] Furthermore, T-shaped grooves are formed on both sides of the arc-shaped guide groove on the gear carrier main board, and clamping lugs are formed on both sides of the bottom of the sliding bearing seat. An elongated hole is formed on the clamping lug, and the locking bolt passes through the elongated hole and is screwed into the T-shaped groove to fix the sliding bearing seat on the gear carrier main board.

[0010] Furthermore, one end of the eccentric adjusting sleeve is provided with a flange, which is attached to one side end face of the sliding bearing seat, and the other end of the eccentric adjusting sleeve is provided with an axial limiting structure, which is attached to the other side end face of the sliding bearing seat to restrict the axial movement of the eccentric adjusting sleeve.

[0011] Furthermore, bolt holes are distributed along the circumferential direction on the flange, and the sliding bearing seat is provided with threaded holes corresponding to the bolt holes around the eccentric sleeve mounting hole. The sleeve locking bolt passes through the bolt hole and is screwed into the threaded hole to fix the rotational position of the eccentric adjusting sleeve.

[0012] Furthermore, bearings are respectively installed at both ends of the inner hole of the eccentric adjusting sleeve. The outer ring of the bearing is engaged with the inner hole of the eccentric adjusting sleeve, and the inner ring of the bearing is engaged with the intermediate shaft. The two ends of the intermediate shaft extend out of the eccentric adjusting sleeve for installing the exchange gear B and the exchange gear C.

[0013] Furthermore, an arc-shaped scale is installed on the side of the gear carrier main board along the arc direction of the arc-shaped guide groove. The arc-shaped scale is marked with the center distance value, and the sliding bearing seat is provided with an indicator pin that cooperates with the arc-shaped scale.

[0014] Furthermore, the end face of the flange is provided with an indicator scale, and the top surface of the sliding bearing seat is provided with an angle scale ring around the eccentric sleeve mounting hole. The indicator scale and the angle scale ring cooperate to indicate the rotation angle of the eccentric adjusting sleeve.

[0015] Furthermore, the inner bores of the hubs of the exchange gears A, B, C, and D are all provided with keyways, and the input shaft, intermediate shaft, and output shaft are provided with flat keys that mate with the keyways. The axial positioning of the exchange gears is achieved by the engagement of the shaft shoulder and the shaft end nut.

[0016] This invention achieves a wide range of continuous adjustment of the center distance by creating an arc-shaped guide groove on the gear carrier main plate, allowing the sliding bearing seat to slide along the arc direction after being embedded in the arc-shaped guide groove. By setting an eccentric adjustment sleeve, utilizing the eccentric relationship between its outer circular axis and the inner hole axis, rotating the eccentric adjustment sleeve allows for fine adjustment of the intermediate shaft's axis position within the eccentricity range, achieving micro-compensation adjustment of the center distance. The arc-shaped guide groove and the eccentric adjustment sleeve, used in conjunction, solve the technical problem that preset fixed hole positions cannot accurately match the center distance of different tooth number combinations, achieving a stepless and precise adjustable center distance, allowing the gear meshing clearance to be adjusted to a suitable state. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the gear hobbing machine for gear processing according to the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the gear hobbing machine for gear processing according to the present invention. Figure 2 ; Figure 3 This is a schematic diagram of the gear hobbing machine for gear processing according to the present invention. Figure 3 ; Figure 4 This is a schematic diagram of the indexing exchange gear set of the present invention. Figure 1 ; Figure 5 This is a schematic diagram of the indexing exchange gear set of the present invention. Figure 2 ; Figure 6 This is a schematic diagram of the indexing exchange gear set of the present invention. Figure 3 ; Detailed Implementation

[0018] In gearbox production, a mismatch between production capacity and equipment resource allocation is quite common. When the workload of spline shaft milling machines is insufficient and gear hobbing machines cannot meet production needs, it is necessary to seek optimized equipment resource allocation solutions. Spline shaft milling machines and gear hobbing machines are similar in their machining principles; both use the generating motion between the hob and the workpiece to achieve machining. Therefore, it is technically feasible to modify spline shaft milling machines for use as gear hobbing machines.

[0019] In the process of converting a splined shaft milling machine into a gear hobbing machine, it is necessary to add indexing change gears to the original transmission system to achieve synchronous indexing motion between the hob and the workpiece. The indexing change gears typically employ a four-wheel structure, with change gear A mounted on input shaft 2, change gear D mounted on output shaft 3, and change gears B and C mounted on the same intermediate shaft 4. When changing change gears with different tooth combinations to accommodate workpieces with different tooth counts, the required center distance between gear pairs AB and CD varies depending on the tooth combination.

[0020] In existing technology, the intermediate shaft 4 is installed using pre-drilled fixed holes in the gear carrier, and the operator selects the installation position from preset holes based on the tooth combination. However, due to the large number of tooth combinations in the interchangeable gears and the non-linear distribution of the center distance, the number and position of preset holes cannot cover all theoretical center distance values. During the installation of some gear combinations, there is a deviation between the preset hole position and the theoretical center distance, necessitating the selection of the closest hole position for compromise installation. When the deviation results in a larger center distance, the gear meshing clearance increases, causing backlash errors during transmission reversal; when the deviation results in a smaller center distance, the gear meshing is too tight, increasing transmission resistance and tooth surface wear. Both situations affect the indexing transmission accuracy and tooth profile machining quality.

[0021] like Figure 1-6 As shown, this embodiment provides a gear hobbing machine for gear processing based on a splined shaft milling machine, which includes at least a splined shaft milling machine body 1, a hobbing cutter, an indexing and exchange gear set, and an adjustable gear carrier.

[0022] The splined shaft milling machine body 1 includes a bed, a worktable, a column, and a hob spindle. The bed serves as the basic support component of the entire machine. The worktable is mounted on the bed for clamping workpieces. The column is fixed to the bed, and the hob spindle is mounted on the column and can rotate around its own axis. A workpiece spindle is located on the worktable, and it can rotate around its own axis to drive the workpiece. The transmission system of the splined shaft milling machine body 1 distributes the power of the main motor to the hob spindle and the workpiece spindle, causing them to rotate synchronously according to a predetermined transmission ratio.

[0023] The gear hobbing cutter is mounted on the hob shaft and positioned by a tapered locating sleeve. The shaft end of the gear hobbing cutter is axially fixed by a clamping nut. The gear hobbing cutter replaces the original spline hob and is mounted on the same hob shaft, utilizing the original hob rotation and feed motion of the spline shaft milling machine to achieve gear hobbing.

[0024] The indexing gear set is used to adjust the transmission ratio between the hob and the workpiece to adapt to the machining requirements of workpieces with different numbers of teeth. The indexing gear set includes four gears: gear A, gear B, gear C, and gear D. Gear A is mounted on the input shaft 2 and connected to the transmission system; gear D is mounted on the output shaft 3 and connected to the transmission chain of the workpiece spindle; gears B and C are mounted on the same intermediate shaft 4. Gears A and B mesh to form the AB gear pair, and gears C and D mesh to form the CD gear pair. By changing the combination of gears with different numbers of teeth, different indexing transmission ratios can be achieved, thus enabling the machining of gear workpieces with different numbers of teeth.

[0025] The adjustable gear carrier is used to install and support the indexing and changing gear set, and includes at least the gear carrier main plate, the sliding bearing seat 6, and the eccentric adjusting sleeve 7.

[0026] The gear carrier main board is bolted to the column or bed of the splined shaft milling machine body 1. The gear carrier main board is a flat plate structure with A-axis mounting holes and D-axis mounting holes. The A-axis mounting hole is used to mount the input shaft 2 containing the change gear A, and the D-axis mounting hole is used to mount the output shaft 3 containing the change gear D. The positions of the two holes are fixed. An arc-shaped guide groove 5 is formed on the gear carrier main board. The arc-shaped guide groove 5 is centered on the axis of the A-axis mounting hole. The inner radius of the arc-shaped guide groove 5 is equal to the required minimum center distance minus the adjustment allowance, and the outer radius is equal to the required maximum center distance plus the adjustment allowance. The arc-shaped guide groove 5 extends through the thickness of the gear carrier main board, forming a through-slot structure.

[0027] The sliding bearing housing 6 supports the intermediate shaft 4 for mounting the changing gears B and C. The bottom of the sliding bearing housing 6 has a guide boss, the outer contour of which forms a clearance fit with the inner contour of the arc-shaped guide groove 5. The guide boss can slide along the arc direction when embedded in the arc-shaped guide groove 5. The center of the sliding bearing housing 6 has an eccentric sleeve mounting hole, which is a through hole penetrating the thickness direction of the sliding bearing housing 6.

[0028] The eccentric adjusting sleeve 7 is a cylindrical part. The axis of its outer circular surface is parallel to but does not coincide with the axis of its inner hole. The distance between the two axes is defined as the eccentricity. The outer circular surface of the eccentric adjusting sleeve 7 forms a clearance fit with the eccentric sleeve mounting hole of the sliding bearing seat 6, allowing the eccentric adjusting sleeve 7 to rotate around its outer circular surface axis within the eccentric sleeve mounting hole. The inner hole of the eccentric adjusting sleeve 7 is used to mount the bearing of the intermediate shaft 4, and the axis of the intermediate shaft 4 coincides with the axis of the inner hole of the eccentric adjusting sleeve 7. When the eccentric adjusting sleeve 7 rotates within the eccentric sleeve mounting hole, due to the eccentricity between the axis of the inner hole and the axis of the outer circular surface, the axis of the intermediate shaft 4 moves in a circle with the axis of the eccentric sleeve mounting hole as the center and the eccentricity as the radius, thereby achieving a minute adjustment of the position of the intermediate shaft 4 within the range of the eccentricity.

[0029] According to this embodiment, the sliding bearing seat 6 can slide along the arc-shaped guide groove 5 to achieve a wide range of center distance adjustment, and the eccentric adjustment sleeve 7 can rotate to achieve a small compensation adjustment of the center distance. When used together, the intermediate shaft 4 can be positioned at any position within the coverage area of ​​the arc-shaped guide groove 5 to achieve stepless adjustment of the center distance.

[0030] In some embodiments, the tooth configuration of the indexing exchange gear set is determined according to the tooth range of the workpiece to be processed. When it is necessary to process gear workpieces with 13, 17, 19, or 25 to 36 teeth, the indexing exchange gear set includes exchange gears with 24, 38, 52, 54, 56, 58, 62, 64, 65, 66, 68, and 70 teeth, and the corresponding indexing transmission ratio is achieved by combining different gears.

[0031] In some embodiments, the hub bores of exchange gears A, B, C, and D are provided with keyways, and corresponding keyways are provided on the input shaft 2, intermediate shaft 4, and output shaft 3. The exchange gears are connected to their respective shafts via flat keys to transmit torque. Axial positioning of the exchange gears is achieved through the engagement of a shaft shoulder and a shaft end nut. The shaft shoulder restricts the axial movement of the exchange gear to one side, and the shaft end nut is screwed onto the shaft end thread and presses against the end face of the exchange gear, restricting the axial movement of the exchange gear to the other side.

[0032] In some embodiments, the eccentricity of the eccentric adjusting sleeve 7 is 0.3 mm to 1.0 mm, and the specific value of the eccentricity is determined according to the positioning accuracy of the arc-shaped guide groove 5 and the adjustment requirements of the gear meshing clearance.

[0033] In some embodiments, deep groove ball bearings are respectively installed at both ends of the inner hole of the eccentric adjusting sleeve 7. The outer rings of the deep groove ball bearings are interference-fitted with the inner hole of the eccentric adjusting sleeve 7, and the inner rings of the deep groove ball bearings are interference-fitted with the intermediate shaft 4. The intermediate shaft 4 passes through the inner rings of the two bearings, and both ends of the intermediate shaft 4 extend out of the eccentric adjusting sleeve 7 for installing the interchangeable gear B and interchangeable gear C. The intermediate shaft 4 is provided with a shoulder, which fits against the inner ring end face of one bearing. The other end of the intermediate shaft 4 is pressed against the inner ring end face of the other bearing by a shaft end nut, thereby achieving axial positioning of the intermediate shaft 4 relative to the eccentric adjusting sleeve 7.

[0034] In some embodiments, T-shaped grooves are formed on both sides of the arc-shaped guide groove 5 along the arc direction. The T-shaped grooves are formed on the gear carrier main plate and extend parallel to the arc-shaped guide groove 5. The bottom sides of the sliding bearing seat 6 are provided with clamping lugs, each with an elongated hole extending along the arc direction of the arc-shaped guide groove 5. A locking bolt passes through the elongated hole on the clamping lug and screws into the T-shaped groove. After tightening the locking bolt, the head of the locking bolt presses the clamping lug against the gear carrier main plate, thereby fixing the sliding bearing seat 6 to the gear carrier main plate.

[0035] In some embodiments, one end of the eccentric adjusting sleeve 7 is provided with a flange, the diameter of which is larger than the diameter of the eccentric sleeve mounting hole. The flange fits against one end face of the sliding bearing seat 6. The other end of the eccentric adjusting sleeve 7 is provided with a shoulder or retaining ring groove, the diameter of which is larger than the diameter of the eccentric sleeve mounting hole, or a retaining ring is installed in the retaining ring groove. The shoulder or retaining ring fits against the other end face of the sliding bearing seat 6, cooperating with the flange to restrict the axial movement of the eccentric adjusting sleeve 7. Multiple bolt holes are evenly distributed along the circumference of the flange. The sliding bearing seat 6 has threaded holes around the eccentric sleeve mounting hole corresponding to the bolt holes on the flange. The sleeve locking bolt passes through the bolt holes on the flange and screws into the threaded holes on the sliding bearing seat 6. After tightening the sleeve locking bolt, the flange is pressed against the sliding bearing seat 6, thereby fixing the rotational position of the eccentric adjusting sleeve 7.

[0036] Furthermore, to facilitate the operator in quickly determining the sliding position of the sliding bearing seat 6, an arc-shaped scale is fixedly installed on the side of the gear carrier main plate along the arc direction of the arc-shaped guide groove 5. The center distance value is marked on the arc-shaped scale. An indicator pin is provided on the top surface of the sliding bearing seat 6. The indicator pin cooperates with the arc-shaped scale. When the sliding bearing seat 6 slides along the arc-shaped guide groove 5, the indicator pin points to the corresponding center distance value on the arc-shaped scale, and the operator can directly read the current center distance.

[0037] Furthermore, to facilitate the operator in determining the rotation angle and eccentric direction of the eccentric adjusting sleeve 7, the end face of the flange is provided with indicator lines, and the top surface of the sliding bearing seat 6 is engraved with an angle scale ring around the eccentric sleeve mounting hole. The indicator lines cooperate with the angle scale ring, allowing the operator to determine the current rotation angle of the eccentric adjusting sleeve 7 based on the direction of the indicator lines on the angle scale ring, and thus determine the offset direction of the intermediate shaft 4 axis relative to the axis of the eccentric sleeve mounting hole.

[0038] Instructions for use; Step 1: Install the gear hobbing cutter on the hobbing spindle of the splined milling machine. The gear hobbing cutter replaces the original splined hobbing cutter and is installed on the same shaft position.

[0039] Step 2: Based on the number of teeth of the workpiece to be processed and the hob parameters, determine the tooth combination of interchangeable gears A, B, C, and D, and calculate the theoretical center distance of the AB gear pair.

[0040] Step 3: Allow the sliding bearing seat 6 to slide freely along the arc-shaped guide groove 5, push the sliding bearing seat 6 to move along the arc-shaped guide groove 5 until the distance between the intermediate shaft 4 and the A-axis is close to the theoretical center distance value, and fix the sliding bearing seat 6 on the gear carrier main board.

[0041] Step 4: Install the interchangeable gears B and C on the intermediate shaft 4, and manually rotate the gears to check the meshing state of the AB gear pair. If the meshing clearance is too large or the meshing is too tight, allow the eccentric adjusting sleeve 7 to rotate within the eccentric sleeve mounting hole. Rotate the eccentric adjusting sleeve 7 to adjust the axial position of the intermediate shaft 4 until the meshing clearance is appropriate, and then fix the rotation position of the eccentric adjusting sleeve 7.

[0042] Step 5: Install change gear A and change gear D to complete the assembly of the four-wheel change gear system, so that the indexing change gear set and the transmission system of the spline shaft milling machine form a complete transmission chain.

[0043] Step 6: Clamp the gear blank on the workpiece spindle of the worktable and start the spline shaft milling machine to perform gear hobbing.

[0044] In some embodiments, step three is as follows: loosen the bearing housing locking bolt to allow the sliding bearing housing 6 to slide freely along the arc-shaped guide groove 5, push the sliding bearing housing 6 to move along the arc-shaped guide groove 5 and observe the reading of the indicator pin on the arc-shaped scale. When the reading is close to the theoretical center distance value, tighten the bearing housing locking bolt to fix the sliding bearing housing 6 on the gear carrier main board.

[0045] In some embodiments, step four is as follows: Align the indicator line of the flange of the eccentric adjusting sleeve 7 with the zero-degree position of the angle scale ring to determine the eccentric direction; install the exchange gear B on the end of the intermediate shaft 4 near the A-axis and the exchange gear C on the end of the intermediate shaft 4 near the D-axis; manually rotate the gears to feel the meshing state of the AB gear pair. If the meshing clearance is too large, the center distance needs to be reduced by rotating the eccentric adjusting sleeve 7 so that the indicator line of the flange points towards the angle direction closer to the A-axis; if the meshing is too tight, the center distance needs to be increased by rotating the eccentric adjusting sleeve 7 so that the indicator line of the flange points away from the A-axis. After each small rotation, recheck the meshing state, repeatedly adjust until the meshing clearance is appropriate, and tighten the sleeve locking bolt to fix the rotation position of the eccentric adjusting sleeve 7.

[0046] In some embodiments, step five further includes: manually rotating the entire transmission chain to check the smoothness of transmission, confirming that there is no jamming or obvious gap, and recording the arc scale reading and the angle of the eccentric adjustment sleeve 7 corresponding to the current tooth number combination, so as to facilitate quick reset when the same combination is used next time.

[0047] This embodiment achieves the functional conversion of the splined shaft milling machine into a gear hobbing machine by mounting the gear hobbing cutter on the hob shaft of the splined shaft milling machine and adding an indexing exchange gear set with an adjustable gear carrier, thus solving the problem of mismatch in production equipment resource allocation.

[0048] The adjustable gear frame of this embodiment adopts a graded adjustment structure combining an arc-shaped guide groove 5 and an eccentric adjustment sleeve 7, thus realizing stepless precise adjustment of the center distance and solving the technical problem that the preset fixed hole position cannot accurately match the center distance of different tooth number combinations.

[0049] Specifically, the arc-shaped guide groove 5 is centered on the mounting hole of axis A. When the sliding bearing seat 6 moves along the arc-shaped guide groove 5, the distance between the intermediate shaft 4 and axis A is equal to the radius of the arc corresponding to the sliding position. Because the arc-shaped guide groove 5 is a continuous through-slot structure rather than discrete holes, the intermediate shaft 4 can be positioned at any position within the arc range, eliminating the problem of insufficient preset holes leading to no suitable hole positions to choose from.

[0050] The eccentric adjusting sleeve 7 achieves micro-position compensation through the eccentric relationship between its inner hole axis and the outer circular surface axis. Because the positioning accuracy of the arc-shaped guide groove 5 is affected by factors such as the guide groove clearance and locking displacement, it is difficult to achieve the accuracy required for gear meshing. Therefore, the eccentric adjusting sleeve 7 is needed for micro-compensation. When the eccentric adjusting sleeve 7 rotates within the eccentric sleeve mounting hole, the axis of the intermediate shaft 4 moves in a circular motion with the eccentricity as the radius, allowing for fine adjustment of the shaft center position in any direction within the positive and negative eccentricity range. Because the fine-tuning process relies on feedback adjustment by checking the actual meshing state rather than depending on scale readings, it can compensate for the residual error during the coarse adjustment stage of the arc-shaped guide groove 5.

[0051] The arc-shaped guide groove 5 provides a wide range of position adjustment capabilities at the millimeter level, while the eccentric adjusting sleeve 7 provides a small range of position fine adjustment capabilities at the sub-millimeter level. The two are interconnected in terms of adjustment range and complementary in function. Therefore, this embodiment enables precise adjustment of the center distance across the entire range, solving the problem of excessive or tight gear meshing clearance caused by center distance deviation, and improving the indexing transmission accuracy and tooth profile machining quality.

[0052] Spline shaft milling machines and gear hobbing machines share similar machining principles, both employing the generating motion between the hob and the workpiece. This embodiment utilizes the existing hob rotation, hob feed, and table rotation motions of the spline shaft milling machine. By adding an indexing exchange gear set, the transmission ratio is altered, adapting the generating motion originally used for spline machining to the indexing requirements of gear machining. The adjustable gear carrier allows the indexing exchange gear set to accommodate various tooth number combinations, thereby expanding the machining range of the modified gear hobbing machine.

Claims

1. A gear hobbing machine for gear processing, characterized in that, include: Splined shaft milling machine body, the splined shaft milling machine body is provided with a hob shaft and a workpiece spindle; A gear hobbing cutter, the gear hobbing cutter being mounted on the hobbing shaft; The indexing exchange gear set includes an exchange gear A mounted on the input shaft, an exchange gear D mounted on the output shaft, and exchange gears B and C mounted on the intermediate shaft. The exchange gear A and the exchange gear B mesh to form an AB gear pair, and the exchange gear C and the exchange gear D mesh to form a CD gear pair. An adjustable gear carrier includes a gear carrier main board, a sliding bearing seat, and an eccentric adjustment sleeve. The gear carrier main board is provided with an A-axis mounting hole for mounting the input shaft, a D-axis mounting hole for mounting the output shaft, and an arc-shaped guide groove. The sliding bearing seat is embedded in the arc-shaped guide groove and can slide along the arc direction. The eccentric adjustment sleeve is mounted on the sliding bearing seat. The outer circular surface axis of the eccentric adjustment sleeve is parallel to the inner hole axis and has an eccentricity. The intermediate shaft is mounted in the inner hole of the eccentric adjustment sleeve. The eccentric adjustment sleeve can rotate around its outer circular surface axis to adjust the axial position of the intermediate shaft.

2. The gear hobbing machine for gear processing according to claim 1, characterized in that, The arc-shaped guide groove is centered on the axis of the A-axis mounting hole and extends through the thickness direction of the gear carrier main plate to form a through-groove structure.

3. The gear hobbing machine for gear processing according to claim 1, characterized in that, The bottom of the sliding bearing seat is provided with a guide boss, the outer contour of the guide boss and the inner contour of the arc-shaped guide groove are in clearance fit, and the guide boss is embedded in the arc-shaped guide groove.

4. The gear hobbing machine for gear processing according to claim 1, characterized in that, The gear carrier main board has T-shaped grooves on both sides of the arc-shaped guide groove. The bottom sides of the sliding bearing seat have clamping lugs with elongated holes. Locking bolts pass through the elongated holes and are screwed into the T-shaped grooves to fix the sliding bearing seat on the gear carrier main board.

5. The gear hobbing machine for gear processing according to claim 1, characterized in that, One end of the eccentric adjusting sleeve is provided with a flange, which is attached to one side end face of the sliding bearing seat. The other end of the eccentric adjusting sleeve is provided with an axial limiting structure, which is attached to the other side end face of the sliding bearing seat to limit the axial movement of the eccentric adjusting sleeve.

6. The gear hobbing machine for gear processing according to claim 5, characterized in that, The flange has bolt holes distributed along the circumference. The sliding bearing seat has threaded holes around the eccentric sleeve mounting hole that correspond to the bolt holes. The sleeve locking bolt passes through the bolt holes and is screwed into the threaded holes to fix the rotational position of the eccentric adjusting sleeve.

7. The gear hobbing machine for gear processing according to claim 1, characterized in that, Bearings are installed at both ends of the inner hole of the eccentric adjusting sleeve. The outer ring of the bearing is engaged with the inner hole of the eccentric adjusting sleeve, and the inner ring of the bearing is engaged with the intermediate shaft. The two ends of the intermediate shaft extend out of the eccentric adjusting sleeve for installing the exchange gear B and the exchange gear C.

8. The gear hobbing machine for gear processing according to claim 1, characterized in that, An arc-shaped scale is installed on the side of the gear carrier main board along the arc direction of the arc-shaped guide groove. The center distance value is marked on the arc-shaped scale. The sliding bearing seat is provided with an indicator pin that cooperates with the arc-shaped scale.

9. The gear hobbing machine for gear processing according to claim 5 or 6, characterized in that, The flange end face is provided with an indicator scale, and the top surface of the sliding bearing seat is provided with an angle scale ring around the eccentric sleeve mounting hole. The indicator scale and the angle scale ring cooperate to indicate the rotation angle of the eccentric adjusting sleeve.

10. The gear hobbing machine for gear processing according to claim 1, characterized in that, The inner bores of the hubs of the exchange gears A, B, C, and D are all provided with keyways. The input shaft, intermediate shaft, and output shaft are provided with flat keys that mate with the keyways. The axial positioning of the exchange gears is achieved by the engagement of the shaft shoulder and the shaft end nut.

Images