A measuring fixture for planetary gear trains and a method for assembling the same

Abstract

The application provides a kind of measurement fixed combination device of planetary gear train and its assembly method, belong to planetary gear transmission technical field, the device is installed in the inside and above of sun gear and star wheel shaft assembly, the device includes: fixed mandrel mechanism and joint fixing mechanism;Fixed mandrel device includes mandrel, cone sleeve, nut, pin, anti-rotation screw, for fixed planetary gear train sun gear, prevent its rotation and axial string movement;Joint fixing device includes mounting body, positioning shaft, bushing, positioning collar, positioning pin shaft, pin shaft bushing, screw, for realizing relative fixation between sun gear and star wheel shaft assembly, finally realize sun gear and star wheel shaft assembly are fixed simultaneously.By the application, sun gear and star wheel shaft assembly in planetary gear train can be fixed simultaneously, prevent its rotation and axial string movement in the measurement process, the function of measurement fixed combination device can be realized, improve product assembly, measurement efficiency, ensure the reliability of measurement data.

Description

Technical Field

[0001] This application belongs to the field of planetary gear transmission technology, and in particular relates to a measuring and fixing assembly device for planetary gear trains and its assembly method. Background Technology

[0002] The NW type planetary gear transmission includes one internal mesh and one external mesh, featuring small size, light weight, compact structure, high load capacity, and high transmission efficiency. However, because its planetary gears employ a double-gear assembly (a star wheel shaft assembly consisting of a large star wheel and a small star wheel), its manufacturing and installation are relatively complex. Furthermore, due to unavoidable manufacturing and installation errors, as well as the influence of component deformation, the load distribution among the planetary gears is uneven, affecting the vibration level of the planetary gear transmission.

[0003] In addition to employing appropriate design and manufacturing methods, reasonable assembly and measurement methods are also necessary to improve the load-sharing performance of planetary gear transmissions. Without assembling the gear ring, the sun gear and each planetary gear shaft assembly are assembled into the housing. In this state, the sun gear and each planetary gear shaft assembly must be fixed so that the working surfaces of each large planetary gear and the sun gear are simultaneously in contact. The angular deviation of the corresponding tooth surface of each small planetary gear should be within the specified range. Currently, there is a lack of a reliable planetary gear system fixing device in the relevant technology to secure the sun gear and each planetary gear shaft assembly, preventing rotation during measurement and ensuring the validity of the angular deviation measurement values ​​of the small planetary gears. Summary of the Invention

[0004] To simultaneously fix the sun gear and each planetary gear shaft assembly and prevent rotation and axial movement during measurement, while also requiring sufficient measurement space and ease of operation for angular deviation measurement, this invention provides a measurement and fixing assembly device for planetary gear trains and its assembly method. The technical solution is as follows:

[0005] In a first aspect, a measuring and fixing assembly for a planetary gear train is provided. This assembly is installed inside and above the sun gear and star gear shaft assembly. The assembly includes: a fixing spindle mechanism and a combined fixing mechanism.

[0006] The sun gear is mounted on a fixed spindle mechanism and is fixed by the fixed spindle mechanism;

[0007] The joint fixing mechanism is mounted above the planetary gear train and is used to fix the sun gear and the star gear shaft assembly relative to each other.

[0008] The fixed spindle mechanism includes: a spindle, a tapered sleeve, a nut, a pin, and an anti-rotation screw.

[0009] The spindle is located on the housing, and the sun gear is mounted on the spindle. The spindle has a radial threaded hole in the middle for installing an anti-rotation screw that fixes the internal spline of the sun gear. A tapered sleeve is inserted between the sun gear and the spindle. A pin is fitted into the pin hole of a nut for axially fixing the sun gear. The nut is located at the threaded part at the end of the spindle. The nut is tightened by applying torque through the pin, and the sun gear is pressed between the tapered sleeve and the spindle shoulder.

[0010] The spindle is equipped with a mounting flange and a positioning stop. The flange end face fits against the casing end face, and the positioning stop is interference-fitted with the casing bushing hole.

[0011] The anti-rotation screw in the middle of the spindle has its head resting against the inner spline groove.

[0012] The anti-rotation screw has a spherical end.

[0013] The outer surface of the cone sleeve is a cone surface, which, after installation, rests against the chamfered part at the end of the inner spline of the sun gear.

[0014] The combined fixing mechanism includes: a bushing, a positioning collar, a mounting body, a positioning shaft, a pin bushing, and a positioning pin.

[0015] The bushing and pin bushing are located on the mounting body. The positioning shaft is connected to the mounting body. The mounting body is located above the planetary gear train. The outer diameter of the positioning shaft mates with both the inner diameter of the mounting body and the inner diameter of the spindle. The positioning pin is located in the pin bushing on the mounting body and in the mounting hole of the casing. Part of the shaft section of the positioning pin mates with the pin bushing and part mates with the mounting hole of the casing. The positioning collar is located between the small planetary gear shaft diameter and the mounting body bushing.

[0016] In a second aspect, a method for assembling a measuring and fixing assembly for any of the planetary gear trains described in the first aspect is provided, characterized in that the method includes: assembling a sun gear on a fixed spindle mechanism, wherein the sun gear is fixed by the fixed spindle mechanism; assembling a combined fixing mechanism above the planetary gear train, thereby achieving relative fixation between the sun gear and the planetary gear shaft assembly through the combined fixing mechanism.

[0017] The fixed mandrel mechanism includes: a mandrel, a tapered sleeve, a nut, a pin, and an anti-rotation screw; the combined fixing mechanism includes: a bushing, a positioning collar, a mounting body, a positioning shaft, a pin bushing, and a positioning pin. The method specifically includes:

[0018] Step 1: Assemble the spindle onto the housing, then install and tighten the nut;

[0019] Step 2: With the small end of the spindle facing upwards, assemble the sun gear onto the spindle;

[0020] Step 3: Rotate the sun gear until one of the screw holes on the spindle is aligned with the spline groove inside the sun gear. Install the anti-rotation screw so that the hemispherical part of the anti-rotation screw rests against the spline groove inside the sun gear. After installing the anti-rotation screw, the sun gear is circumferentially fixed.

[0021] Step 4: Insert the tapered sleeve between the sun gear and the spindle;

[0022] Step 5: Install the pin into the pin hole of the nut, then install the nut into the threaded part at the end of the spindle. Apply torque through the pin to tighten the nut. The sun gear is pressed between the tapered sleeve and the spindle shoulder, and the sun gear is axially fixed. The assembly of the fixed spindle mechanism is complete.

[0023] Step 6: Install the bushing and pin bushing onto the mounting body;

[0024] Step 7: Connect the positioning shaft to the mounting body;

[0025] Step 8: Install the mounting body containing the bushing, pin bushing, and positioning shaft onto the planetary gear train, while ensuring that part of the positioning shaft is located in the inner hole of the spindle. The outer diameter of the positioning shaft mates with both the mounting body and the inner hole of the spindle, thus providing a centering function.

[0026] Step 9: Install the positioning pin into the pin bushing on the mounting body and into the mounting hole of the casing;

[0027] Step 10: Install the same number of positioning collars as the star wheel shaft assembly between the small star wheel shaft diameter and the mounting body bushing, thus completing the installation of the joint fixing mechanism.

[0028] This invention provides a measurement and fixing assembly device for planetary gear trains and its assembly method. The device allows for the simultaneous fixing of the sun gear and the star gear shaft assembly in the planetary gear train, preventing rotation and axial movement during measurement. This measurement and fixing assembly maximizes the measurement space while controlling weight. It is installed inside and above the planetary gear train, with no obstruction in the circumferential direction of the star gear shaft assembly, facilitating angular deviation measurement. The assembly method proposed in this invention enables the measurement and fixing assembly to function effectively, improving product assembly and measurement efficiency and ensuring the reliability of measurement data. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the fixed mandrel mechanism provided in an embodiment of this application;

[0030] Figure 2 A schematic diagram of the combined fixing mechanism provided in the embodiments of this application;

[0031] Figure 3 A flowchart illustrating the assembly method of a planetary gear train measurement and fixing assembly device provided in this application embodiment.

[0032] Among them, 1-mandrel, 2-tapered sleeve, 3-nut, 4-pin, 5-anti-rotation screw, 6-shield, 7-positioning collar, 8-mounting body, 9-screw, 10-positioning shaft, 11-pin bushing, 12-positioning pin. Detailed Implementation

[0033] The present application will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0034] like Figure 1 and Figure 2 As shown, the present invention provides a measurement and fixing assembly for a planetary gear train. The assembly includes a fixing mandrel mechanism and a combined fixing mechanism. The main function of the assembly is to simultaneously fix the sun gear and the star gear shaft assembly. The measurement and fixing assembly is installed inside and above the sun gear and the star gear shaft assembly. The star gear shaft assembly is unobstructed in the circumferential direction, which facilitates the operation of angular deviation measurement.

[0035] The fixed spindle mechanism includes: spindle 1, tapered sleeve 2, nut 3, pin 4, and anti-rotation screw 5. The main function of the fixed spindle mechanism is to fix the sun gear of the planetary gear train and prevent it from rotating and moving axially.

[0036] The spindle 1 is located on the housing and locked by a nut. The sun gear is mounted on the spindle 1. The spindle 1 has a radial threaded hole in the middle for installing the anti-rotation screw 5. The anti-rotation screw 5 is used to fix the internal spline of the sun gear and prevent the sun gear from rotating circumferentially. The tapered sleeve 2 is fitted between the sun gear and the spindle 1. The tapered sleeve 2 can prevent the spindle 1 and the sun gear from being eccentric and ensure high positioning accuracy. The pin 4 is located in the pin hole of the nut 3. The nut 3 is located at the threaded part of the end of the spindle 1. The pin 4 applies torque to tighten the nut 3, and the sun gear is pressed between the tapered sleeve 2 and the shoulder of the spindle 1. The pin 4 is used to lock the nut 3 and applies torque to it evenly to prevent the nut 3 from being misaligned or misfitted. The nut 3 is used to axially fix the sun gear.

[0037] Specifically, the spindle 1 is provided with a mounting flange and a positioning stop. The flange end face fits against the end face of the housing, and the positioning stop is interference-fitted with the housing bushing hole, so that the spindle 1 is firmly connected to the housing and ensures high positioning accuracy. The spindle 1 is used to support the sun gear and also provides an interface for the tapered sleeve 2, nut 3, and anti-rotation screw 5.

[0038] The anti-rotation screw 5 installed in the middle of the spindle 1 has its screw head resting against the inner spline groove to prevent the sun gear from rotating circumferentially.

[0039] In another embodiment, the anti-rotation screw 5 has a spherical end, which can prevent damage to the spline inside the sun gear after installation.

[0040] In another embodiment, the outer surface of the tapered sleeve 2 is a tapered surface. After installation, the tapered surface rests against the chamfered part of the spline end of the sun gear. The tapered sleeve 2 can prevent wear on the end face of the sun gear during the tightening of the nut.

[0041] The combined fixing mechanism includes: bushing 6, positioning collar 7, mounting body 8, screw 9, positioning shaft 10, pin bushing 11, and positioning pin 12. The main function of this mechanism is to achieve relative fixation between the sun gear and the star gear shaft assembly, ultimately securing both the sun gear and the star gear shaft assembly simultaneously.

[0042] Bushing 6 and pin bushing 11 are located on mounting body 8. Positioning shaft 10 is connected to mounting body 8 by screw 9. Mounting body 8 is located above the planetary gear train. The outer diameter of positioning shaft 10 mates with both the inner hole of mounting body 8 and spindle 1, serving a centering function; positioning shaft 10 acts as a bridge connecting the two mechanisms. Positioning pin 12 is located on mounting body 8, between pin bushing 11 and housing mounting hole. Part of the shaft section of positioning pin 12 mates with pin bushing 11, and part mates with housing mounting hole, serving an auxiliary positioning function. Positioning collar 7 is located between the small planetary gear shaft diameter and mounting body bushing 6. Positioning collar 7 is installed between bushing 6 and planetary gear shaft assembly to fix the planetary gear shaft assembly.

[0043] Specifically, mounting body 8 is flat and disc-shaped, providing a mounting platform for other components in the combined fixing mechanism. This structure maximizes the measurement space while controlling weight.

[0044] Bushing 6 and pin bushing 11 can be replaced after long-term use to prevent reduced accuracy due to wear.

[0045] Please see Figures 1 to 3 The figure shows a flowchart of an assembly method for a measuring and fixing assembly device for a planetary gear train. The method includes the following steps:

[0046] Step 1: Assemble spindle 1 onto the housing, then install and tighten the nut.

[0047] Step 2: With the small end of spindle 1 facing upwards, assemble the sun gear onto spindle 1.

[0048] Step 3: Rotate the sun gear until one of the screw holes on spindle 1 aligns with the spline groove inside the sun gear. Install the anti-rotation screw 5. During assembly, the sun gear can be gently rotated to ensure that the hemispherical part of the anti-rotation screw 5 is precisely against the spline groove inside the sun gear. After installing the anti-rotation screw 5, the sun gear is circumferentially fixed.

[0049] Step 4: Insert the cone sleeve 2 between the sun gear and the spindle 1.

[0050] Step 5: Install pin 4 into the pin hole of nut 3, then install nut 3 into the threaded part at the end of spindle 1. Apply torque through pin 4 to tighten nut 3, pressing the sun gear between the tapered sleeve 2 and the shoulder of spindle 1, thus fixing the sun gear axially. The assembly of the fixed spindle mechanism is complete.

[0051] Step 6: Install bushing 6 and pin bushing 11 onto mounting body 8.

[0052] Step 7: Connect the positioning shaft 10 to the mounting body 8 using screws 9.

[0053] Step 8: Install the mounting body 8, which contains bushing 6, pin bushing 11, screw 9, and positioning shaft 10, onto the planetary gear train, ensuring that a portion of the positioning shaft 10 is located within the inner hole of the spindle 1. The outer diameter of the positioning shaft 10 mates with both the mounting body 8 and the inner hole of the spindle 1, serving a centering function. The positioning shaft 10 acts as a bridge connecting the fixed spindle mechanism and the combined fixing mechanism.

[0054] Step 9: Install the positioning pin 12 into the pin bushing 11 and the housing mounting hole on the mounting body 8.

[0055] Step 10: Install the same number of positioning collars 7 as the star wheel shaft assembly between the small star wheel shaft diameter and the mounting bushing 6. The combined fixing mechanism is now installed, meaning the measurement and fixing assembly of the planetary gear train is complete.

[0056] The above description merely illustrates the embodiments of this application, and while the description is relatively specific and detailed, it should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Furthermore, any parts of this invention not described in detail are conventional techniques.

Claims

1. A measuring and fixing assembly device for a planetary gear train, characterized in that, The device includes: a fixed mandrel mechanism and a combined fixing mechanism. The sun gear is mounted on a fixed spindle mechanism and is fixed by the fixed spindle mechanism; The joint fixing mechanism is mounted above the planetary gear train and is used to fix the sun gear and the star gear shaft assembly relative to each other. The fixed spindle mechanism includes: spindle, tapered sleeve, nut, pin, and anti-rotation screw. The spindle is located on the housing, and the sun gear is mounted on the spindle. The spindle has a radial threaded hole in the middle for installing an anti-rotation screw that secures the internal spline of the sun gear. A tapered sleeve is fitted between the sun gear and the spindle. A pin is fitted into the pin hole of a nut used to axially fix the sun gear. The nut is located at the threaded end of the spindle. The pin applies torque to tighten the nut, pressing the sun gear between the tapered sleeve and the spindle shoulder. The pin is used to lock the nut, applying torque evenly to prevent the nut from being misaligned or improperly installed. The nut is used to axially fix the sun gear. The spindle is equipped with a mounting flange and a positioning stop. The flange end face fits against the end face of the housing, and the positioning stop is interference-fitted with the housing bushing hole, so that the spindle and the housing are firmly connected together and high positioning accuracy is guaranteed. The spindle is used to support the sun gear and also provides an interface for the tapered sleeve, nut, and anti-rotation screw. The combined fixing mechanism includes: a bushing, a positioning collar, a mounting body, a positioning shaft, a pin bushing, and a positioning pin. The bushing and pin bushing are located on the mounting body. The positioning shaft is connected to the mounting body. The mounting body is located above the planetary gear train. The outer diameter of the positioning shaft mates with both the inner diameter of the mounting body and the inner diameter of the spindle. The positioning pin is located in the pin bushing on the mounting body and in the mounting hole of the casing. Part of the shaft section of the positioning pin mates with the pin bushing, and part mates with the mounting hole of the casing. The positioning collar is located between the small planetary gear shaft diameter and the mounting body bushing. The mounting body is flat and disc-shaped, providing a mounting platform for other components in the combined fixing mechanism.

2. The apparatus according to claim 1, characterized in that, The anti-rotation screw in the middle of the spindle has its head resting against the inner spline groove.

3. The apparatus according to claim 1, characterized in that, The anti-rotation screw has a spherical end.

4. The apparatus according to claim 1, characterized in that, The outer surface of the cone sleeve is a cone surface, and after installation, this cone surface rests against the chamfered part of the spline end of the sun gear.

5. A method for assembling a measuring and fixing assembly for a planetary gear train according to any one of claims 1 to 4, characterized in that, The method includes: assembling the sun gear onto a fixed spindle mechanism, wherein the sun gear is fixed by the fixed spindle mechanism; and assembling a combined fixing mechanism above the planetary gear train, thereby achieving relative fixation between the sun gear and the planetary gear shaft assembly through the combined fixing mechanism. The fixed spindle mechanism includes: a spindle, a tapered sleeve, a nut, a pin, and an anti-rotation screw; the combined fixing mechanism includes: a bushing, a locating collar, a mounting body, a locating shaft, a pin bushing, and a locating pin. This method specifically includes: Step 1: Assemble the spindle onto the housing, then install and tighten the nut; Step 2: With the small end of the spindle facing upwards, assemble the sun gear onto the spindle; Step 3: Rotate the sun gear until one of the screw holes on the spindle is aligned with the spline groove inside the sun gear. Install the anti-rotation screw so that the hemispherical part of the anti-rotation screw rests against the spline groove inside the sun gear. After installing the anti-rotation screw, the sun gear is circumferentially fixed. Step 4: Insert the tapered sleeve between the sun gear and the spindle; Step 5: Install the pin into the pin hole of the nut, then install the nut into the threaded part at the end of the spindle. Apply torque through the pin to tighten the nut. The sun gear is pressed between the tapered sleeve and the spindle shoulder, and the sun gear is axially fixed. The assembly of the fixed spindle mechanism is complete. Step 6: Install the bushing and pin bushing onto the mounting body; Step 7: Connect the positioning shaft to the mounting body; Step 8: Install the mounting body containing the bushing, pin bushing, and positioning shaft onto the planetary gear train, while ensuring that part of the positioning shaft is located in the inner hole of the spindle. The outer diameter of the positioning shaft mates with both the mounting body and the inner hole of the spindle, thus providing a centering function. Step 9: Install the positioning pin into the pin bushing on the mounting body and into the mounting hole of the casing; Step 10: Install the same number of positioning collars as the star wheel shaft assembly between the small star wheel shaft diameter and the mounting body bushing, thus completing the installation of the joint fixing mechanism.

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