Planet wheel assembly assembling tool

Abstract

The utility model discloses a planet wheel assembly assembling tool, and relates to the technical field of planet wheel assembling, the planet wheel assembly assembling tool comprises a positioning part used for being placed between a planet wheel and a planet carrier shaft, the positioning part comprises a limiting area arranged towards the inner wall of the planet wheel, and the limiting area can limit the assembling deviation of the planet wheel; the press-fitting part and the positioning part are arranged in an avoiding mode. The press-fitting part comprises a stress area and a force application area which are connected. The stress area is located on the side, away from the planet carrier, of the planet wheel. The force application area is used for making contact with the end face of the side, away from the planet carrier, of an inner ring of the bearing. According to the utility model, through the positioning part, the planet wheel does not displace in the assembling process; the press-fitting part transmits pressure to the inner ring of the bearing, so that the bearing drives the planet wheel to move towards the planet carrier shaft, and then assembly is completed; due to the fact that the force application area is used for making contact with the end face of the side, away from the planet carrier shaft, of the bearing inner ring, force for press fitting of the planet wheel can be applied to the bearing inner ring, and the planet wheel can be accurately press-fitted to the planet carrier shaft.

Description

Technical Field

[0001] This utility model relates to the field of planetary gear assembly technology, and in particular to a planetary gear assembly tooling. Background Technology

[0002] In existing technologies, planetary gear assembly relies on specialized tools. However, due to the limitations of the planetary gear assembly's structure, these tools cannot penetrate deep into the parts, making it difficult to accurately assemble the planetary gears onto the planet carrier shaft. Therefore, improving the accuracy of planetary gear assembly assembly has become a pressing technical problem that needs to be solved by those skilled in the art. Utility Model Content

[0003] The purpose of this invention is to provide a planetary gear assembly tooling to solve the problems existing in the prior art and improve the accuracy of planetary gear assembly.

[0004] To achieve the above objectives, this utility model provides the following solution:

[0005] This utility model provides a planetary gear assembly fixture, which includes:

[0006] The positioning part is used to be inserted between the planetary gear to be assembled and the planetary carrier shaft. The gap between the planetary gear and the planetary carrier shaft matches the positioning part. The positioning part includes a limiting area disposed toward the inner wall of the planetary gear. The limiting area can apply a first force to the planetary gear. The first force can limit the assembly deviation of the planetary gear.

[0007] The pressing part is disposed away from the positioning part, and the pressing part includes a connected force-receiving area and a force-applying area;

[0008] The stress zone is located on the side of the planetary gear away from the planet carrier, and the stress zone is used to receive the pressure from the press-fitting equipment;

[0009] The force application area is used to contact the end face of the inner ring of the bearing on the side away from the planetary carrier;

[0010] The planetary gear is used to be sleeved on the outside of the planetary carrier shaft, and the planetary gear is sleeved on the bearing.

[0011] Preferably, the positioning part and the pressing part are located on the same side of the planetary gear. The positioning part has a first channel, the extension direction of which is parallel to the axis of the planetary carrier shaft, and the first channel is used for sliding engagement with the force application area; and / or, the pressing part includes a second channel, the extension direction of which is parallel to the axis of the planetary carrier shaft, and the second channel is used for sliding engagement with the planetary carrier shaft.

[0012] Preferably, the positioning part and the pressing part are separately disposed; or, the positioning part and the pressing part are integrally disposed, and there is a clearance area between the positioning part and the bearing.

[0013] Preferably, the positioning part and the planetary carrier shaft are in surface contact or point contact.

[0014] Preferably, the press-fitting part includes a lubrication channel, a first end of which has an outlet facing the mating surface of the planetary carrier shaft and the bearing, and a second end of which is used to inject a lubricating medium.

[0015] Preferably, the pressing part includes a sleeve, the first end of the sleeve is disposed toward the planetary carrier, and the first end of the sleeve constitutes the force application area;

[0016] The inner diameter of the sleeve gradually decreases from the first end of the sleeve toward the second end of the sleeve.

[0017] And / or, a deformation zone is provided between the sleeve and the planetary carrier shaft.

[0018] Preferably, the press-fitting part is provided with a heat dissipation area, and the mating surface of the bearing and the planetary carrier shaft is connected to the heat dissipation area through a heat dissipation channel.

[0019] The present invention achieves the following technical advantages over the prior art:

[0020] When assembling planetary gears onto the planetary carrier shaft, the planetary gears, equipped with bearings, are first aligned and preliminarily fitted onto the planetary carrier shaft. Then, a positioning part is placed between the planetary gears and the planetary carrier shaft. Through the limiting area of ​​the positioning part, a first force is applied to the planetary gears, suppressing any offset or skew during the assembly process, thereby reducing assembly errors between the planetary gears and the planetary carrier shaft and improving the assembly quality of the planetary gears. Furthermore, the pressing part in this invention receives pressure from the pressing equipment through a force-bearing area and transmits this pressure to a force-applying area connected to the force-bearing area. The force-applying area then transmits the pressure to the bearings assembled with the planetary gears, enabling the bearings to drive the planetary gears towards the planetary carrier shaft, thus completing the assembly between the planetary gears and the planetary carrier shaft. Assembly; and, since the force application area is used to contact the end face of the bearing inner ring away from the planetary carrier shaft, the force of pressing the planetary gears can be directly applied to the bearing inner ring, fitting the bearing's force characteristics (fitting the bearing's force characteristics can be understood as the application of the pressing planetary gears to the bearing inner ring not only allows the bearing to be smoothly pressed into the planetary carrier shaft, but also avoids deformation of the bearing's rolling elements), thus enabling the bearing inner ring and planetary gears to be accurately pressed into the planetary carrier shaft. This not only avoids the problem of deformation and damage to the bearing's rolling elements due to lateral force or compressive stress when the force application area contacts the bearing outer ring, but also avoids the problem of the pressing force not being transmitted to the bearing inner ring due to the contact between the force application area and the bearing outer ring, resulting in the bearing not being properly installed into the planetary carrier shaft. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the planetary gears to be assembled.

[0023] Figure 2 This is a schematic longitudinal section of the planetary gear to be assembled.

[0024] Figure 3 A schematic diagram of the assembly fixture for the planetary gear assembly;

[0025] Figure 4 A schematic longitudinal section of the assembly fixture for the planetary gear assembly;

[0026] Among them, 1. planetary carrier shaft; 2. planetary gears; 3. positioning part; 4. pressing part. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] like Figures 1-4 As shown, this utility model discloses a planetary gear 2 assembly fixture, which includes: a positioning part 3, which is used to insert the planetary gear 2 to be assembled between the planetary gear 2 and the planetary carrier shaft 1, the gap between the planetary gear 2 and the planetary carrier shaft 1 matching the positioning part 3, the positioning part 3 including a limiting area provided towards the inner wall of the planetary gear 2, the limiting area being able to apply a first force to the planetary gear 2, the first force being able to limit the assembly deviation of the planetary gear 2; and a pressing part 4, which is disposed abutting the positioning part 3, the pressing part 4 including a connected force-receiving area and a force-applying area; the force-receiving area is located on the side of the planetary gear 2 away from the planetary carrier, the force-receiving area being used to receive the pressure of the pressing equipment; the force-applying area is used to contact the end face of the inner ring of the bearing on the side away from the planetary carrier; wherein, the planetary gear 2 is used to be sleeved on the outer side of the planetary carrier shaft 1, and the bearing is sleeved with the planetary gear 2.

[0030] When planetary gear 2 needs to be assembled onto planetary carrier shaft 1, the planetary gear 2 with bearings is first aligned and initially fitted onto planetary carrier shaft 1. Then, the positioning part is placed between planetary gear 2 and planetary carrier shaft 1. Through the limiting area of ​​the positioning part, the limiting area applies a first force to planetary gear 2, suppressing displacement such as offset and skew during the assembly of planetary gear 2 onto planetary carrier shaft 1, thereby reducing the assembly error between planetary gear 2 and planetary carrier shaft 1 and improving the assembly quality of planetary gear 1. Furthermore, the pressing part 4 in this utility model receives the pressure of the pressing equipment through the force receiving area and transmits the pressure to the force applying area connected to the force receiving area. The force applying area then transmits the pressure to the bearing assembled with planetary gear 2, so that the bearing can drive planetary gear 2 to move in the direction of planetary carrier shaft 1, thereby completing the assembly of planetary gear 2 and planetary carrier shaft 1. The assembly between the carrier shaft 1; and, since the force application area is used to contact the end face of the bearing inner ring away from the planetary carrier shaft 1, the force of pressing the planetary gear 2 can be directly applied to the bearing inner ring, fitting the bearing's force characteristics (fitting the bearing's force characteristics can be understood as the application of the pressing planetary gear 2 to the bearing inner ring not only allows the bearing to be smoothly pressed into the planetary carrier shaft 1, but also avoids deformation of the bearing's rolling elements), thereby enabling the bearing inner ring and planetary gear 2 to be accurately pressed into the planetary carrier shaft 1. This not only avoids the problem of deformation and damage to the bearing's rolling elements due to lateral force or compressive stress when the force application area contacts the bearing outer ring, but also avoids the problem of the pressing force not being transmitted to the bearing inner ring due to the contact between the force application area and the bearing outer ring, resulting in the bearing not being correctly installed into the planetary carrier shaft 1.

[0031] The avoidance arrangement of the pressing part 4 and the positioning part 3 means that the functions of the pressing part 4 and the positioning part 3 can be smoothly realized without mutual interference. For example, the pressing part 4 and the positioning part 3 can be arranged sequentially from the inside to the outside along the radial direction of the planetary carrier shaft 1, or sequentially along the circumference of the planetary carrier shaft 1. The limiting area can be specifically understood as the area where the positioning part faces the planetary gear 2 and abuts against the planetary gear 2. Matching the gap between the planetary gear 2 and the planetary carrier shaft 1 with the positioning part means that the positioning part can be inserted between the planetary gear 2 and the planetary carrier shaft 1, and the limiting area of ​​the positioning part can suppress and reduce the displacement of the planetary gear 2 during the assembly process; and it should be noted that the positioning part suppresses the displacement of the planetary gear 2 during the assembly process that would increase the assembly error, but does not completely prevent the displacement of the planetary gear 2, otherwise the planetary gear 2 would not be able to be assembled onto the planetary carrier shaft 1.

[0032] It should be noted that the planetary gears 2 mentioned in this article refer to the planetary gears 2 to be assembled onto the planetary carrier shaft 1, and the bearings are all located on the inner ring of the planetary gears 2 and mate with the planetary gears 2. The fit between the bearings and the inner ring of the planetary gears 2 can be either a transition fit or an interference fit, depending on the operating conditions. The bearings can be bearings without an outer ring, or bearings that have both an inner ring and an outer ring.

[0033] like Figure 4As shown, the positioning part 3 and the pressing part 4 are located on the same side of the planetary gear 2. The positioning part 3 has a first channel, the extension direction of which is parallel to the axis of the planetary carrier shaft 1. The first channel is used for sliding engagement with the force application area. Alternatively, the pressing part 4 includes a second channel, the extension direction of which is parallel to the axis of the planetary carrier shaft 1. The second channel is used for sliding engagement with the planetary carrier shaft 1. Through the first channel and / or the second channel, the force application area can move in a direction parallel to the axis of the planetary carrier shaft 1, thereby ensuring that the pressing force received by the pressing part 4 can be accurately transmitted to the inner ring of the bearing, ensuring the accuracy of the planetary gear 2 assembly.

[0034] "And / or" means that the text preceding "and / or" and the text following "and / or" can exist simultaneously or separately. For example, "A and / or B" includes the case where only A or B exists, as well as the case where A and B exist simultaneously.

[0035] like Figure 4 As shown, both the positioning part 3 and the pressing part 4 have operating parts extending from the side away from the planetary carrier, for easy handling by the operator and for the pressing equipment to apply pressing force to the pressing part 4; the operating part can be a flange or other structure that facilitates handling and transmits pressing force. The first channel and / or the second channel ensures smoothness in the pressing process, enabling the planetary gear assembly to have high pressing quality and a fast assembly rate, especially in batch installation, which can generate economies of scale; and it is also safer.

[0036] The positioning part 3 and the pressing part 4 in this utility model can be configured in various ways. For example, the positioning part 3 and the pressing part 4 can be configured separately. In this case, if the positioning part 3 or the pressing part 4 is damaged, only the damaged structure can be replaced, without replacing the entire planetary gear assembly tooling, thus reducing maintenance costs. Alternatively, the positioning part 3 and the pressing part 4 can be configured as a single unit. There is a clearance area between the positioning part 3 and the bearing. By configuring them as a single unit, the planetary gear assembly tooling can be placed between the planetary gear 2 and the planetary carrier shaft 1 in one go, eliminating the need for the placement step of the positioning part 3 or the pressing part 4, thus improving assembly efficiency. The single unit configuration means that the positioning part 3 and the pressing part 4 are connected. They can be connected together by welding, snap-fitting, threaded connection, integral molding, or other connection methods. It should be noted that the single unit configuration of the positioning part 3 and the pressing part 4 should not affect the normal functioning of the original positioning part 3 and the pressing part 4. Specifically, the clearance area between the positioning part 3 and the bearing can be a gap. The gap is set so that the pressing force will not be transmitted to other areas outside the inner ring of the bearing through the positioning part 3, so that the planetary gear 2 can be accurately pressed into the planetary carrier shaft 1.

[0037] In this invention, the positioning part 3 and the planetary carrier shaft 1 are in surface contact or point contact. When the positioning part 3 and the planetary carrier shaft 1 are in surface contact, the positioning part 3 can specifically be a positioning ring located between the planetary carrier shaft 1 and the planetary gear 2. When the positioning part 3 and the planetary carrier shaft 1 are in point contact, the positioning part 3 can specifically be a positioning block, with one end of the positioning block facing the planetary carrier shaft 1 being a pointed tip, so as to achieve point contact between the positioning part 3 and the planetary carrier shaft 1. In this case, the positioning part 3 may include multiple positioning blocks. However, when the positioning part 3 and the planetary carrier shaft 1 are in surface contact or point contact, the positioning part 3 is not limited to the above structure; other structures that can achieve surface contact or point contact with the planetary carrier shaft 1 are also possible.

[0038] like Figure 4 As shown, the pressing part 4 can specifically be a sleeve that can be fitted onto the planetary carrier shaft. In this case, the end of the sleeve that extends into the planetary gear is the force application area, and the end of the sleeve that is located outside the planetary gear is the force receiving area.

[0039] The steps for assembling planetary gear 2 using the planetary gear assembly tooling in this utility model are as follows: Figure 4 As shown, first align the bearing inner hole with the planetary carrier shaft 1, align the positioning part 3 with the inner hole of the planetary gear 2, and install it between the planetary gear 2 and the planetary carrier shaft 1 for positioning to prevent the planetary gear 2 from shifting during assembly. Then, align the force application area with the end face of the bearing inner ring, and use a press to press the pressing part 4, thereby pressing the bearing inner ring and the planetary gear 2 onto the planetary carrier shaft 1.

[0040] Although this utility model only discloses the assembly of planetary gears onto the planetary carrier shaft, it can also be used to assemble other planetary gear assemblies that use bearings.

[0041] It should be noted that the planetary gear assembly tooling in this utility model has the following advantages: ① The structure is simple and reliable, and the planetary gear 2 is positioned by controlling the size; ② It can be disassembled and installed at any time for the bearing installation of planetary gear 2 in the same batch, which improves the efficiency of assembly operations; ③ It has good versatility and standardization, does not require professional customized tools, is easy to manage, and reduces manufacturing costs; ④ It has a compact structure, is easy to assemble, and has an overall lightweight design, which is convenient for processing and operation.

[0042] Regarding the above content, it should be noted that: size control can be understood as the radial length of the positioning part 3 being no less than the distance between the planetary gear 2 and the planetary carrier shaft 1, thus limiting the possible displacement of the planetary gear 2 during assembly; planetary gears 2 of the same batch refer to planetary gears 2 using the same type of bearing; universality and standardization mean that the same tooling can be applied to the assembly of different planetary components using the same type of bearing; lightweight design means that the new wheel assembly tooling in this utility model only includes two parts: the positioning part 3 and the pressing part 4, and its construction is relatively simple and ingenious.

[0043] Furthermore, this invention also features scale lines on the pressing part, which are set in a direction parallel to the axis of the planetary carrier shaft. This allows operators to determine whether the planetary gears are properly assembled by observing the scale lines exposed outside the planetary gears on the pressing part when it is difficult to observe the installation status of the planetary gears.

[0044] Furthermore, the press-fitting part 4 in this invention may also include a lubrication channel. The first end of the lubrication channel has an outlet facing the mating surface between the planetary carrier shaft and the bearing, and the second end of the lubrication channel is used to inject lubricating medium. The lubricating medium in this invention not only has a lubricating function but also a certain cooling effect. By adding lubricating medium to the second end of the lubrication channel, the lubricating medium is discharged from the outlet through the lubrication channel and enters the mating surface between the planetary carrier shaft and the bearing, reducing frictional heat generation during the planetary gear press-fitting process. This reduces the expansion of the planetary carrier shaft due to high pressure and frictional heat, lowers the assembly difficulty, and ensures smooth assembly of the planetary gears. Specifically, the lubricating medium can be a lubricating oil or other medium with lubricating function.

[0045] The press-fitting part 4 of this utility model includes a sleeve, with its first end facing the planetary carrier, forming a force-applying area. The inner diameter of the sleeve gradually decreases from its first end to its second end. The sleeve is clearance-fitted with the planetary carrier shaft. The gradual decrease in the inner diameter of the sleeve from its first end to its second end results in a gradual decrease in the longitudinal cross-sectional area of ​​the sleeve from its first end to its second end, and the length of the sleeve is greater than the length of the planetary carrier shaft. This ensures that the planetary gears can be smoothly fitted onto the planetary carrier shaft within the movable range of the sleeve relative to the planetary carrier shaft. Simultaneously, the gradual decrease in the inner diameter of the sleeve from its first end to its second end makes it easier for the bearing to be pressed into the planetary carrier shaft during the initial movement. As the planetary gear press-fitting process progresses, a tight fit is gradually achieved, effectively dispersing the assembly pressure and reducing the degree of expansion of the planetary carrier shaft.

[0046] And / or, a deformation zone is provided between the sleeve and the planetary carrier shaft. Specifically, the deformation zone refers to the gap reserved between the sleeve and the planetary carrier shaft. This gap allows the sleeve to move smoothly downward after the planetary carrier shaft expands due to high pressure, thereby press-fitting the inner ring of the bearing and the planetary gears, and successfully completing the assembly of the planetary gears and the planetary carrier shaft.

[0047] The press-fitting part 4 of this utility model is provided with a heat dissipation area, and the mating surfaces of the bearing and the planetary carrier shaft are connected to the heat dissipation area through a heat dissipation channel. The heat dissipation channel can be understood as the path for heat transfer between the mating surfaces of the bearing and the planetary carrier shaft to the heat dissipation area. Specifically, the heat dissipation area can be a heat dissipation hole opened on the side of the sleeve, or a heat-conducting layer coated on the outside of the sleeve; through the heat dissipation hole or heat-conducting layer, the heat generated by friction between the inner ring of the bearing and the planetary carrier shaft can be dissipated in time, thereby reducing the expansion of the planetary carrier shaft due to high press-fitting force and frictional heat, and reducing the assembly difficulty.

[0048] It should be noted that this utility model discloses multiple technical solutions, but does not provide any contrary technical teachings.

[0049] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A planetary gear assembly assembly fixture, characterized in that, The planetary gear assembly fixture includes: The positioning part is used to be inserted between the planetary gear to be assembled and the planetary carrier shaft. The gap between the planetary gear and the planetary carrier shaft matches the positioning part. The positioning part includes a limiting area disposed toward the inner wall of the planetary gear. The limiting area can apply a first force to the planetary gear. The first force can limit the assembly deviation of the planetary gear. The pressing part is disposed away from the positioning part, and the pressing part includes a connected force-receiving area and a force-applying area; The stress zone is located on the side of the planetary gear away from the planet carrier, and the stress zone is used to receive the pressure from the press-fitting equipment; The force application area is used to contact the end face of the inner ring of the bearing on the side away from the planetary carrier; The planetary gear is used to be sleeved on the outside of the planetary carrier shaft, and the planetary gear is sleeved on the bearing.

2. The planetary gear assembly fixture according to claim 1, characterized in that, The positioning part and the pressing part are located on the same side of the planetary gear. The positioning part has a first channel, the extension direction of which is parallel to the axis of the planetary carrier shaft. The first channel is used for sliding engagement with the force application area. And / or, the pressing part includes a second channel, the extension direction of which is parallel to the axis of the planetary carrier shaft. The second channel is used for sliding engagement with the planetary carrier shaft.

3. The planetary gear assembly fixture according to claim 1, characterized in that, The positioning part and the pressing part are separately disposed; or, the positioning part and the pressing part are integrally disposed, and there is a clearance area between the positioning part and the bearing.

4. The planetary gear assembly fixture according to claim 1, characterized in that, The positioning part and the planetary carrier shaft are in surface contact or point contact.

5. The planetary gear assembly assembly fixture according to claim 1, characterized in that, The pressing part is provided with scale lines, which are arranged in a direction parallel to the axis of the planetary carrier shaft.

6. The planetary gear assembly fixture according to claim 1, characterized in that, The press-fitting part includes a lubrication channel, a first end of which has an outlet facing the mating surface of the planetary carrier shaft and the bearing, and a second end of which is used to inject lubricating medium.

7. The planetary gear assembly assembly fixture according to claim 1, characterized in that, The pressing part includes a sleeve, the first end of which is disposed toward the planetary carrier, and the first end of the sleeve constitutes the force application area; The inner diameter of the sleeve gradually decreases from the first end of the sleeve toward the second end of the sleeve. And / or, a deformation zone is provided between the sleeve and the planetary carrier shaft.

8. The planetary gear assembly assembly fixture according to claim 1, characterized in that, The press-fitting part is provided with a heat dissipation area, and the mating surface of the bearing and the planetary carrier shaft is connected to the heat dissipation area through a heat dissipation channel.

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