An assembly tool for a planetary gear

Abstract

The utility model relates to a kind of assembly tool for planetary gear for planetary gear assembly technology field, comprising: base, the centre installation hole is in middle part, for positioning installation planet carrier;The base top surface ring is equipped with several positioning pin holes and sliding slot;Support spring, assembly in the positioning pin hole inner cavity bottom;Pin shaft, sliding fit in positioning pin hole, and lower end surface is in contact with the top surface of support spring, and under the action of support spring, it is positioned to planetary gear that extends out;Top plate, its circumferential side ring is equipped with several downward guide rods, and guide rod one-to-one slidingly inserted in sliding slot;The top plate ring is equipped with several positioning holes, and positioning hole and positioning pin hole one-to-one correspond, for positioning to planetary gear shaft;The utility model supports planet carrier by base, and using pin shaft is positioned to planet carrier, planetary gear in turn, then the positioning hole of top plate is positioned to planetary gear shaft, ensure that the accurate press fitting of planetary gear shaft is completed once.

Description

Technical Field

[0001] This utility model relates to the field of planetary gear assembly technology, and in particular to an assembly fixture for planetary gears. Background Technology

[0002] Planetary gears generally include a planetary carrier mounted on a fixture and planetary gears rotatably connected to the planetary carrier. The planetary carrier has a connecting shaft adapted to the mounting holes of the fixture. The planetary carrier has a mounting cavity for accommodating the planetary gears. The bottom wall of the mounting cavity has a pin hole for mounting a pin. The inner ring of most of the planetary gears is rotatably connected to the pin in the planetary carrier by needle rollers. Multiple needle rollers rotatably connected to the inner side of the planetary gears form an inner hole for aligning with the pin hole.

[0003] The existing planetary gear installation process involves aligning the inner hole of the needle rollers with the pin hole of the planet carrier, and then pressing the pin into the pin hole and the inner hole using a pressing device to achieve a rotatable connection between the pin and the needle rollers. However, when using this installation method, since there is no positioning mechanism between the planetary gear and the planet carrier, the planetary gear may wobble during the installation process. This can cause the pin to collide with the end of the needle roller during movement, damaging the needle roller and causing product damage, thus affecting the yield rate.

[0004] Chinese Patent CN210549651U discloses a planetary gear assembly fixture. The fixture involves mounting a planetary carrier onto a main body through mounting holes, placing planetary gears into the mounting cavity of the planetary carrier, and using an elastic element to push a positioning shaft into the inner hole of the planetary gear to limit its movement. An external pressing device then presses a pin into the inner hole of the planetary gear, completing the assembly. While this device can precisely limit the movement of the planetary gears, it is difficult to ensure that the pin (planetary gear shaft) is coaxial with the center hole of the planetary gear or the positioning shaft, allowing it to smoothly pass through the center hole of the planetary gear. Furthermore, it is difficult to guarantee that the pin, after passing through the center hole of the planetary gear, will smoothly press into the mounting hole of the planetary carrier.

[0005] To address this, we designed an assembly fixture for planetary gears. Utility Model Content

[0006] In order to overcome the shortcomings of the prior art, this utility model discloses an assembly fixture for planetary gears.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] An assembly fixture for planetary gears, comprising:

[0009] The base has a central mounting hole in its middle for positioning and mounting the planetary carrier; the top surface of the base is provided with a plurality of positioning pin holes and sliding grooves.

[0010] A support spring is fitted into the bottom of the inner cavity of the positioning pin hole;

[0011] The pin is slidably fitted into the positioning pin hole, and its lower end face abuts against the top surface of the support spring. Under the action of the support spring, it extends to position the planetary gear.

[0012] The top plate has several downward guide rods around its periphery, and each guide rod is slidably inserted into a groove. The top plate also has several positioning holes, which correspond to positioning pin holes for positioning the planetary gear shaft.

[0013] Furthermore, the protruding length of the pin is not less than 1 / 3 of the length of the planetary gear center hole and the sum of the thickness of the planetary carrier bottom wall, and is not greater than the distance between the base and the top plate.

[0014] Furthermore, the protruding length of the pin is greater than the sum of the length of the planetary gear center hole and the thickness of the planetary carrier bottom wall;

[0015] The upper end of the pin is provided with a center point that mates with the central hole of the planetary gear shaft.

[0016] Furthermore, the positioning pin hole is a stepped hole with a larger diameter at the bottom and a smaller diameter at the top; the lower end of the pin shaft is provided with an enlarged diameter section that matches the larger diameter section of the positioning pin hole.

[0017] Furthermore, a screw plug is threaded at the bottom of the large-diameter section of the positioning pin hole to support the lower end of the support spring.

[0018] Furthermore, the number of positioning pin holes is 3-6.

[0019] Furthermore, the number of the positioning pin holes is an even number.

[0020] Furthermore, the positioning pin holes are staggered, with a stagger angle of 0.1±0.01°.

[0021] Furthermore, the lower end of the base is provided with an outwardly extending mounting plate.

[0022] Furthermore, the thickness of the top plate is no greater than the thickness of the cover plate of the planetary carrier.

[0023] Compared with the prior art, the beneficial effects of this utility model are:

[0024] 1. Support the planetary carrier with the base, and use pins to align the planetary carrier and planetary gears in sequence. Then, position the planetary gear shaft through the positioning holes on the top plate to ensure that the planetary gear shaft is accurately pressed in one go.

[0025] 2. The top-point design at the upper end of the pin shaft can guide and position the lower end of the planetary gear shaft in real time during the press-fitting process, ensuring that the planetary gear shaft is always in a vertical state and preventing slight skew of the planetary gear shaft from causing misalignment with the planetary gear shaft assembly hole on the planet carrier;

[0026] 3. The design of the screw plug allows for the separate disassembly and replacement of the pin and support spring after the pin is damaged. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of this utility model;

[0028] Figure 2 This is a schematic diagram of the exploded structure of this utility model;

[0029] Figure 3 This is a cross-sectional view of the first structure of this utility model;

[0030] Figure 4 This is a cross-sectional view of the second structure of this utility model;

[0031] Figure 5 This is a schematic diagram of the misaligned arrangement of the positioning pin holes in this utility model.

[0032] In the diagram: 1. Base; 11. Center mounting hole; 12. Locating pin hole; 13. Slide groove; 14. Mounting plate; 2. Support spring; 3. Pin; 31. Center; 32. Expanded diameter section; 4. Top plate; 41. Locating hole; 5. Guide rod; 6. Plug. Detailed Implementation

[0033] The present invention will be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention. In the description of the present invention, it should be understood that if terms such as "upper", "lower", "front", "rear", "left", "right" indicate orientation or positional relationship, they are only corresponding to the drawings of this application for the convenience of describing the present invention. It should be understood that if terms such as "end", "side", "end portion", "side part", "lateral", "longitudinal", etc. indicate orientation or positional relationship, they are only corresponding to the length and width of the corresponding component. That is, "end" indicates the head and tail area in the length direction of the corresponding component, and "side part" indicates the head and tail area in the width direction of the corresponding component. They are used for the convenience of describing the present invention and do not indicate or imply that the device or element referred to must have a specific orientation.

[0034] Example 1, in conjunction with Appendix Figure 1-4An assembly fixture for planetary gears includes a base 1 and a top plate 4. The base 1 has a central mounting hole 11 in the middle, and a plurality of locating pin holes 12 and sliding grooves 13 are provided on the top surface. A support spring 2 and a pin 3 are installed sequentially from bottom to top in the locating pin holes 12. The support spring 2 provides upward support to the pin 3, causing the upper end of the pin 3 to extend out and engage with the central hole of the planetary gear, thus achieving the corresponding operation of the planetary gear. A plurality of downward guide rods 5 are provided around the top plate 4, and the guide rods 5 are slidably engaged with the sliding grooves 13 one by one. A plurality of positioning holes 41 are provided around the top plate 4, and the positioning holes 41 correspond one-to-one with the locating pin holes 12, for positioning the planetary gear shaft; that is, during assembly, the lower end of the planetary gear shaft is inserted into the positioning hole 41, so that the planetary gear shaft is in a vertical state.

[0035] As needed, the lower end of the base 1 is provided with an outwardly extending mounting plate 14.

[0036] As required, the thickness of the top plate 4 is no greater than the thickness of the cover plate of the planetary carrier; that is, the lower end of the planetary gear shaft can be assembled in one go; in other words, after the lower end of the planetary gear shaft is assembled, the upper end of the planetary gear shaft is still higher than the top surface of the top plate 4.

[0037] In one example, the base 1 is first placed vertically on the press table. Then, the planetary carrier is placed on the top surface of the base 1, and the mounting holes for the planetary gears on the planetary carrier are aligned with the positioning pin holes 12. At this time, the pin 3 passes through the mounting holes for the planetary gears on the planetary carrier under the action of the support spring 2. Then, the planetary gear to be assembled is placed on the pin 3. Next, the guide rods 5 are slidably inserted into the corresponding grooves 13, so that the top plate 4 is pressed onto the planetary carrier. Then, the lower end of the planetary gear shaft is inserted into the positioning hole 41. Finally, the press is started to press down the upper end of the planetary gear shaft to complete the planetary gear assembly operation.

[0038] In this embodiment, the number of positioning pin holes 12 is 3-6 evenly arranged in a ring; it should be noted that the number of positioning pin holes 12 is designed according to the actual number of planetary gears assembled on the planetary carrier, and is not specifically limited here.

[0039] As needed, in conjunction with the appendix Figure 3-4 To prevent the pin 3 from coming out of the upper end of the positioning pin hole 12, the positioning pin hole 12 is a stepped hole with a larger diameter at the bottom and a smaller diameter at the top; the lower end of the pin 3 is provided with an enlarged diameter section 32 that matches the large diameter section of the positioning pin hole 12.

[0040] As needed, in conjunction with the appendix Figure 3-4 To prevent the support spring 2 and pin 3 from coming out of the positioning pin hole 12 when changing assembly tools, a screw plug 6 is threaded at the bottom of the large diameter section of the positioning pin hole 12; specifically, the screw plug 6 is fully screwed into the positioning pin hole 12, that is, after the base 1 is placed on the worktable, the screw plug 6 will not affect the horizontal and stable placement of the base 1.

[0041] Example 2, in conjunction with Appendix Figure 4 An assembly fixture for planetary gears differs from Embodiment 1 in that: when the assembled planetary gear is a silent planetary gear, that is, when half of the planetary gears are rigid and the other half are flexible, the number of locating pin holes 12 is even; the locating pin holes 12 are staggered, and the stagger angle is consistent with the stagger angle of the planetary gears, for example, 0.1±0.01°.

[0042] Taking four locating pin holes 12 as an example, combined with the attached... Figure 4 The included angle between the locating pin holes 12 at positions 1 and 2, and the included angle between the locating pin holes 12 at positions 3 and 4 is 89.9±0.01°; the included angle between the locating pin holes 12 at positions 2 and 3, and the included angle between the locating pin hole 12 at position 4 and the locating pin hole 12 at position 1 is 90.1±0.01°.

[0043] In one possible implementation, the protruding length of the pin 3 is not less than 1 / 3 of the length of the planetary gear center hole and the sum of the thickness of the planetary carrier bottom wall, and is not greater than the distance between the base 1 and the top plate 4.

[0044] In another possible implementation, to better guide and position the planetary gear shaft, the extension length of the pin 3 is greater than the sum of the length of the planetary gear center hole and the thickness of the planet carrier bottom wall; the upper end of the pin 3 is provided with a tip 31 that mates with the center hole of the planetary gear shaft; that is, before pressing the planetary gear shaft downward, the planetary gear shaft body mates with the positioning hole 41, and the center hole of the lower end face of the planetary gear shaft mates with the tip 31 of the pin 3, ensuring that the planetary gear shaft is in a vertical state.

[0045] The parts of this utility model not described in detail are prior art. It is obvious to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that this utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the above embodiments should be regarded as exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description. Therefore, it is intended to include all changes that fall within the meaning and scope of the equivalents of the claims in this utility model, and no reference numerals in the claims should be regarded as limiting the content of the claims.

Claims

1. An assembly fixture for planetary gears, characterized in that, include: The base (1) has a central mounting hole (11) in its middle part for positioning and mounting the planetary carrier; the top surface of the base (1) is provided with a number of positioning pin holes (12) and sliding grooves (13). A support spring (2) is fitted into the bottom of the inner cavity of the positioning pin hole (12); The pin (3) slides into the positioning pin hole (12), and its lower end face abuts against the top surface of the support spring (2), and extends under the action of the support spring (2) to position the planetary gear; The top plate (4) has several downward guide rods (5) around its periphery, and the guide rods (5) are slidably inserted into the slide groove (13) one by one; the top plate (4) has several positioning holes (41) around its periphery, and the positioning holes (41) correspond one by one with the positioning pin holes (12) for positioning the planetary gear shaft.

2. The assembly fixture for planetary gears according to claim 1, characterized in that: The extension length of the pin (3) is not less than 1 / 3 of the length of the planetary gear center hole and the thickness of the planetary carrier bottom wall, and is not greater than the distance between the base (1) and the top plate (4).

3. The assembly fixture for planetary gears according to claim 2, characterized in that: The extension length of the pin (3) is greater than the sum of the length of the planetary gear center hole and the thickness of the planetary carrier bottom wall; The upper end of the pin (3) is provided with a tip (31) that mates with the central hole of the planetary gear shaft.

4. The assembly fixture for planetary gears according to claim 1, characterized in that: The positioning pin hole (12) is a stepped hole with a larger diameter at the bottom and a smaller diameter at the top; the lower end of the pin (3) is provided with an enlarged diameter section (32) that matches the large diameter section of the positioning pin hole (12).

5. The assembly fixture for planetary gears according to claim 4, characterized in that: The bottom of the large diameter section of the positioning pin hole (12) is threaded with a screw plug (6) to support the lower end of the support spring (2).

6. The assembly fixture for planetary gears according to claim 1, characterized in that: The number of positioning pin holes (12) is 3-6.

7. The assembly fixture for planetary gears according to claim 6, characterized in that: The number of the positioning pin holes (12) is an even number.

8. The assembly fixture for planetary gears according to claim 7, characterized in that: The positioning pin hole (12) is misaligned, and the misalignment angle is 0.1±0.01°.

9. The assembly fixture for planetary gears according to claim 1, characterized in that: The base (1) has an outwardly extending mounting plate (14) at its lower end.

10. The assembly fixture for planetary gears according to claim 1, characterized in that: The thickness of the top plate (4) is not greater than the thickness of the cover plate of the planetary carrier.

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