Planet carrier shaft tooth machining and positioning tool

Abstract

The utility model provides a planet carrier shaft tooth machining positioning tool which comprises a positioning shaft and an upper tip. The upper tip is in friction fit with the process hole; positioning screw holes are formed in the circumferential direction of the positioning shaft and correspond to the matching grooves in number and position, positioning bolts are in threaded connection with the interiors of the positioning screw holes, positioning blocks are further in threaded fit with the positioning bolts, and the ends of the two sides of the radial plane of each positioning block are in friction fit with the groove walls of the corresponding sides of the matching grooves; and the upper end surface of the positioning seat is in friction fit with the lower planetary plate. The planet carrier positioning device is reasonable in structural design, and in the axial positioning process, the planet carrier is axially positioned from the two ends through the auxiliary hole in the center of the top of the original middle gear shaft and the positioning base. In the radial positioning process, the planet gear is automatically centered and positioned relative to the positioning shaft through tightening operation of the positioning shaft and the positioning bolt, positioning and clamping operation is convenient and fast, and the tool is low in manufacturing cost and easy to achieve.

Description

Technical Field

[0001] This utility model relates to the field of planetary transmission device processing technology, and in particular to a positioning fixture for machining planetary carrier shaft teeth. Background Technology

[0002] Planetary gear drives typically consist of a sun gear, planet gears, an internal gear ring, and a planet carrier. The sun gear is located at the center of the drive, and the planet gears rotate on their own axes and revolve around the fixed axis of the sun gear along with the planet carrier. The planet carrier is the supporting structure for the planet gears; it connects and supports all the planet gears, enabling them to revolve around the sun gear. The planet carrier acts as the output shaft or connects with other components to withstand external torque.

[0003] Existing integral planetary carriers typically include an upper planetary plate, a lower planetary plate, and a planetary gear carrier, with the upper and lower planetary plates integrally connected via the planetary gear carrier. An integrally formed intermediate gear shaft is located at the upper end of the upper planetary plate, with teeth on its outer wall and a process hole typically at the center of its top. The planetary gear carrier has mounting chambers inside, with circumferentially formed mating grooves. The sun gear is housed within the mounting chamber, and corresponding mating grooves for the planetary gears are also located within the mounting chamber.

[0004] The integral planetary carrier, with its intermediate gear shaft integrated onto the upper planetary plate, presents challenges in machining the gear teeth. Machining the intermediate gear shaft of an integral planetary carrier requires first positioning and centering the planetary carrier; only after effective positioning can the gear teeth be machined. Therefore, effectively positioning the planetary carrier is a pressing issue that needs to be addressed. Summary of the Invention

[0005] The technical problem to be solved by this utility model is: in order to overcome the shortcomings of the prior art, this utility model provides a positioning fixture for machining planetary carrier shaft teeth. By utilizing the original integral planetary carrier structure, the planetary carrier can be effectively clamped and positioned axially, and the planetary carrier as a whole can be radially positioned by utilizing the position of the mating groove, which facilitates the subsequent positioning and machining operation of the tooth profile of the intermediate gear shaft.

[0006] The technical solution adopted by this utility model to solve its technical problem is as follows: a positioning fixture for machining planetary carrier shaft teeth, used for positioning an integral planetary carrier. The integral planetary carrier includes, from top to bottom, an integrally formed intermediate gear shaft, an upper planetary plate, a planetary gear carrier, and a lower planetary plate. The planetary gear carrier and the lower planetary plate are provided with mounting chambers. The planetary gear carrier has at least three mating grooves circumferentially. The intermediate gear shaft has a process hole at its center on its top surface. The positioning fixture includes a positioning shaft and an upper center. The upper center is in frictional engagement with the process hole from top to bottom. The positioning shaft has positioning screw holes corresponding to the number and position of the mating grooves circumferentially. The positioning screw holes are internally threaded with positioning bolts. The positioning bolts are also threaded with positioning blocks. The two ends of the radial plane of the positioning blocks are in frictional engagement with the groove walls on the corresponding sides of the mating grooves. A positioning seat is fixed at the bottom of the positioning shaft. The upper end face of the positioning seat is in frictional engagement with the lower planetary plate.

[0007] In the above scheme, the planetary carrier is positioned axially through the cooperation of the upper center and the positioning seat. The positioning shaft, positioning bolts, and positioning blocks are threaded together. During the tightening of the positioning bolts, the two ends of the positioning blocks abut against and lock the corresponding groove walls, ensuring radial positioning of the planetary carrier with the positioning shaft without any torsion. This axial and radial positioning of the planetary carrier effectively facilitates further gear machining of the intermediate gear shaft as needed.

[0008] Furthermore, a supporting power mechanism is connected to the bottom of the positioning seat, which drives the positioning seat to extend, retract, and rotate. The supporting power mechanism can drive the positioning seat, positioning shaft, and planetary carrier to rotate synchronously according to the machining requirements of the shaft gears, and can also move synchronously with the upper center to drive the positioning seat, positioning shaft, and planetary carrier to extend and retract.

[0009] Furthermore, the axial cross-section of the positioning seat is an I-shaped structure, the lower end of the positioning shaft extends outward in a circumferential direction to have a positioning plate, the upper end of the positioning seat is fixed to the positioning plate by bolts, and the lower end is fixed to the supporting power mechanism by bolts.

[0010] Preferably, the planetary gear has three evenly spaced circumferentially spaced mating grooves, and the groove surfaces on both sides of the mating grooves are inclined planes pointing towards the central axis of the planetary gear carrier. The groove surfaces on both sides of the same mating groove are symmetrically arranged with respect to the central axis of the planetary gear carrier. The positioning shaft has three evenly spaced circumferentially spaced positioning screw holes, and the radial cross-section of the positioning block is an isosceles trapezoid, wherein the two sides of the isosceles trapezoid are in frictional engagement with the inclined planes of the mating grooves. During the mating process, the three mating grooves and the three positioning blocks use three points to define a surface, forming a self-centering effect at the mating position, enabling the planetary carrier to effectively complete the centering and radial positioning operations.

[0011] The beneficial effects of this utility model are that the planetary carrier gear machining positioning fixture provided by this utility model has a reasonable structural design. During the axial positioning process, the process hole at the center of the top of the original intermediate gear shaft and the positioning seat are used to axially position the planetary carrier from both ends. In the radial positioning, the mounting chamber inside the planetary gear carrier is used. The positioning shaft extends into the mounting chamber. Through the tightening operation of the positioning shaft and the positioning bolt, the inclined surfaces of the two ends of the positioning block and the two sides of the mating groove are used to make the planetary gear automatically centered relative to the positioning shaft and radially positioned, thereby completing the positioning and clamping of the planetary carrier. This facilitates the subsequent gear profile machining operation of the intermediate gear shaft. The positioning and clamping operation is convenient and quick, the fixture manufacturing cost is low, and it is easy to implement. Attached Figure Description

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0013] Figure 1 This is a schematic diagram of the structure of this utility model.

[0014] Figure 2 yes Figure 1 Enlarged sectional view at point A in the middle.

[0015] Figure 3 This is a structural schematic diagram of the positioning shaft, positioning plate, and positioning sleeve of this utility model.

[0016] In the figure: 1. Upper center; 2. Process hole; 3. Intermediate gear shaft; 4. Upper planetary plate; 5. Lower planetary plate; 6. Positioning seat; 7. Supporting power mechanism; 8. Tooth profile; 9. Machining tool; 10. Planetary gear carrier; 11. Mating groove; 12. Positioning block; 13. Positioning bolt; 14. Inclined surface; 15. Positioning screw hole; 16. Positioning shaft; 17. Positioning plate. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention. Therefore, they only show the components relevant to the present invention. Orientations and references (e.g., up, down, left, right, etc.) are only used to aid in the description of the features in the drawings. Therefore, the following specific embodiments are not intended to be restrictive, and the scope of the claimed subject matter is defined solely by the appended claims and their equivalents. Example

[0018] like Figures 1 to 3 The planetary carrier shaft gear machining positioning fixture shown is an embodiment of this utility model, used for positioning an integral planetary carrier.

[0019] In this embodiment, the planetary carrier is a one-piece planetary carrier. The one-piece planetary carrier, from top to bottom, includes a central gear shaft 3, an upper planetary plate 4, a planetary carrier 10, and a lower planetary plate 5. The central gear shaft 3, upper planetary plate 4, planetary carrier 10, and lower planetary plate 5 are typically integrally formed. The planetary carrier 10 and lower planetary plate 5 have mounting chambers, and the planetary carrier 10 has three circumferentially oriented mating grooves 11. A process hole 2 is formed at the center of the top of the central gear shaft 3. The circumferential outer wall of the central gear shaft 3 needs to be machined with a machining tool 9 to form the tooth profile 8. This embodiment is designed specifically for machining the tooth profile 8.

[0020] The positioning fixture provided in this embodiment includes a positioning shaft 16, a positioning sleeve, and an upper center 1.

[0021] The upper center 1 engages with the process hole 2 from top to bottom through friction. The upper center 1 typically also requires a power mechanism, such as a hydraulic cylinder, to drive its upward, downward, and telescopic movements. The tip of the upper center 1 engages with the process hole 2, providing axial positioning of the planetary carrier from above.

[0022] The lower circumferential movement is achieved through the positioning seat 6 and the supporting power mechanism 7. The positioning seat 6 is fixed to the bottom of the positioning shaft 16 via the positioning plate 17. The upper surface of the positioning seat 6 is in frictional contact with the lower planetary plate 5. The supporting power mechanism 7 drives the positioning seat 6 to extend, retract, and rotate. In actual assembly and positioning, the supporting power mechanism 7 can be powered by a hydraulic cylinder or similar device, and it needs to be synchronized with the motor mechanism of the upper center 1 to drive the positioning seat 6, positioning shaft 16, and planetary carrier to extend and retract synchronously. This facilitates the axial extension and retraction of the intermediate gear shaft 3 relative to the machining tool 9, which is beneficial for the machining and forming of the tooth profile 8.

[0023] The rotation operation of the intermediate gear shaft 3 requires the planetary carrier to be radially positioned by the positioning fixture provided in this embodiment. This radial positioning is achieved by the proposed three-finger self-centering structure formed by the positioning shaft 16, the positioning bolt 13, and the positioning block 12 relative to the mounting groove.

[0024] Specifically, such as Figure 2 and Figure 3 As shown, three locating screw holes 15 are evenly spaced around the circumferential position of the locating shaft 16 corresponding to the mating groove 11. Each locating screw hole 15 is internally threaded with a locating bolt 13, and a locating block 12 is threaded onto the locating bolt 13. The groove surfaces on both sides of the mating groove 11 are inclined planes 14 pointing obliquely towards the central axis of the planetary gear carrier 10, and the groove surfaces on both sides of the same mating groove 11 are symmetrically arranged with respect to the central axis of the planetary gear carrier 10. The radial cross-section of the locating block 12 is an isosceles trapezoid. The two sides of the isosceles trapezoid are in frictional engagement with the inclined plane 14 of the mating groove 11.

[0025] Positioning and assembly process:

[0026] 1. The upper center 1 mates with the process hole 2.

[0027] 2. Control the support power mechanism 7 to drive the positioning shaft 16 to rise until the upper end surface of the positioning seat 6 abuts against the lower end surface of the lower planetary plate 5.

[0028] 3. Control the support power mechanism 7 to drive the positioning shaft 16 to rotate, so that each mating groove 11 can correspond to a positioning screw hole 15, and maintain the radial position of the positioning shaft 16.

[0029] 4. Install the positioning block 12 on the positioning bolt 13 with thread engagement. Each positioning bolt 13 carrying the positioning block 12 is installed in each positioning bolt hole 15. The side of the positioning block 12 is opposite to the wall of the mounting groove.

[0030] 5. Tighten the three positioning bolts 13 respectively. During the tightening process, the two end faces of the positioning block 12 engage with the inclined surfaces 14 of the corresponding mating grooves 11. During the locking process, the planetary carrier is pushed and adjusted for centering, so that the axis of the positioning shaft 16 overlaps with the axis of the planetary carrier. After the positioning bolts 13 are tightened, the radial positioning of the positioning shaft 16 and the planetary carrier is completed.

[0031] During the radial positioning process, the three mating grooves 11 and the three positioning blocks 12, during the mating process, use three points to determine a surface, forming a self-centering effect at the mating position, so that the planetary carrier can effectively complete the centering and radial positioning operations.

[0032] This planetary carrier gear machining positioning fixture, designed in this way, achieves axial positioning of the planetary carrier through the cooperation of the upper center 1 and the positioning seat 6. Through the threaded engagement of the positioning shaft 16, positioning bolt 13, and positioning block 12, during the tightening of the positioning bolt 13, the two ends of the positioning block 12 abut against and lock the corresponding groove walls 11, ensuring radial positioning of the planetary carrier with the positioning shaft 16 without any torsion. After completing the axial and radial positioning of the planetary carrier, a power mechanism drives the planetary carrier to extend axially and rotate radially, thereby cooperating with the machining tool 9 to machine the tooth profile 8 of the intermediate gear shaft 3. This fixture design features simple and easy-to-manufacture components, low production costs, and requires no further adjustments to existing planetary carrier designs, demonstrating good economic prospects. Example

[0033] like Figure 1 and Figure 3 The planetary carrier shaft gear machining positioning fixture shown is a second embodiment of this utility model.

[0034] Based on Example 1, Example 2 further designs the structure of the positioning seat 6 and the connection method between the positioning shaft 16 and the positioning seat 6.

[0035] Specifically, such as Figure 2 and Figure 3 As shown, the axial cross-section of the positioning seat 6 is an I-shaped structure, and the lower end of the positioning shaft 16 extends outward in a circumferential direction with a positioning plate 17. The I-shaped positioning seat 6 forms two mounting end faces, upper and lower. The upper mounting end face is fixed to the positioning plate 17 by bolts. The lower mounting end face is fixed to the supporting power mechanism 7 by bolts, so that the supporting power mechanism 7 can drive it to rotate and extend.

[0036] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A positioning fixture for machining planetary carrier shaft gears, used for positioning an integral planetary carrier, the integral planetary carrier comprising, from top to bottom, an integrally formed intermediate gear shaft (3), an upper planetary plate (4), a planetary gear carrier (10), and a lower planetary plate (5), wherein the planetary gear carrier (10) and the lower planetary plate (5) are provided with mounting chambers, the planetary gear carrier (10) has at least three circumferentially formed mating grooves (11), and the intermediate gear shaft (3) has a process hole (2) at the center of its top surface, characterized in that: Includes a positioning axis (16) and an upper center (1); The upper center (1) is in frictional engagement with the process hole (2) from top to bottom; The positioning shaft (16) is provided with positioning screw holes (15) in the number and position of the corresponding mating grooves (11) in the circumferential direction. The positioning screw holes (15) are connected to positioning bolts (13) by internal threads. The positioning bolts (13) are also threaded with positioning blocks (12). The two ends of the radial plane of the positioning blocks (12) are respectively in frictional engagement with the groove walls on the corresponding sides of the mating grooves (11). The bottom of the positioning shaft (16) is fixed with a positioning seat (6), and the upper end surface of the positioning seat (6) is in frictional engagement with the lower planetary plate (5).

2. The positioning fixture for machining planetary carrier shaft gears as described in claim 1, characterized in that: The bottom of the positioning seat (6) is connected to a support power mechanism (7), which drives the positioning seat (6) to extend, retract and rotate.

3. The positioning fixture for machining planetary carrier shaft gears as described in claim 1, characterized in that: The axial section of the positioning seat (6) is an I-shaped structure. The lower end of the positioning shaft (16) extends outward in the circumferential direction and has a positioning plate (17). The upper end of the positioning seat (6) is fixed to the positioning plate (17) by bolts, and the lower end is fixed to the supporting power mechanism (7) by bolts.

4. The positioning fixture for machining planetary carrier shaft gears as described in claim 1, characterized in that: The planetary gear has three evenly spaced mating grooves (11) on its circumference, and the groove surfaces on both sides of the mating groove (11) are inclined surfaces (14) pointing obliquely towards the central axis of the planetary gear carrier (10). The groove surfaces on both sides of the same mating groove (11) are symmetrically arranged with respect to the central axis of the planetary gear carrier (10). The positioning shaft (16) has three evenly spaced positioning screw holes (15) on its circumference. The positioning block (12) has an isosceles trapezoidal radial cross section, wherein the two sides of the isosceles trapezoid are respectively frictionally mated with the inclined surfaces (14) of the mating groove (11).

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