Two-section shaft assembling jig for servo motor

Abstract

The utility model discloses a servo motor two-section shaft assembly jig, which comprises a jig body, an ejector plate and an ejector screw, the jig body is axially provided with a stepped hole, one end of the stepped hole is a first hole part connected and matched with a motor shaft, and the other end of the stepped hole is a second hole part connected and matched with an encoder shaft. The jig body is in small clearance fit with a motor shaft and an encoder shaft, open grooves for avoiding connecting screw mounting hole sites of the motor shaft and the encoder shaft are formed in the jig body, the open grooves are in one-to-one correspondence with the screw mounting hole sites, an ejector plate is mounted at the outer end of the jig body, and the ejector plate is connected with the motor shaft and the encoder shaft. And the ejection plate is in threaded connection with an ejection screw pointing to the stepped hole. By means of the mode, the jig can avoid the requirement for the machining precision of the positioning hole, guarantees the assembly precision, simplifies assembly, is convenient to install and does not need extra detection.

Description

Technical Field

[0001] The utility model relates to the technical field of motor assembly, in particular to a two-section shaft assembly fixture for a servo motor. Background Art

[0002] With the diversification of application environments, servo motors are often used in harsh environments, especially in vibration and shock environments. Servo motors using rotary transformers will encounter encoder signal fluctuations and spikes that cause driver alarms. Usually, manufacturers will thicken the shell and mating parts to reduce the impact of vibration on the encoder; another way is to adjust the driver parameters to filter out the spikes; or use two-section shafts to isolate the impact of vibration on the magnetic field.

[0003] The disadvantage of method one is that the cost is too high, which is not conducive to the market competitiveness of the product; the disadvantage of method two is that it may lead to misjudgment. When the host is out of control, the driving force may filter out the signal, making it impossible to take timely action; the disadvantage of method three is that when the shaft diameter is small, tolerance design is difficult, and it is not easy to process and install.

[0004] The two shaft sections need to be locked together by screws, and the inner hole needs to be processed to position the two shaft sections. Because the shaft diameter is small, when a relatively small clearance fit is actually used, it is found that processing is difficult and the yield rate is very low. If a relatively large clearance fit is used, the coaxiality does not meet the requirements. If a transition fit is used, when the shaft size is too large and the hole size is too small, the temperature needs to be heated to a very high level through the shrink fitting method, which is not convenient for processing. If the press fitting method is used, the shaft length is longer, and press fitting will affect the concentricity of the shaft. Only when there is a small clearance can the precision requirements be met.

[0005] Based on the above defects and shortcomings, it is necessary to improve the existing technology and design a two-section shaft assembly fixture for a servo motor. Utility Model Content

[0006] The main technical problem solved by the utility model is to provide a two-section shaft assembly fixture for a servo motor. The fixture can avoid the requirement of positioning hole processing accuracy, ensure assembly accuracy, simplify assembly, facilitate installation and do not require additional testing.

[0007] To solve the above technical problems, a technical solution adopted by the present utility model is: to provide a jig for assembling two-section shafts of a servo motor. This jig for assembling two-section shafts of a servo motor includes a jig body, an ejection plate, and an ejection screw. The jig body is axially provided with a stepped hole. One end of the stepped hole is a first hole portion for connecting and mating with the motor shaft, and the other end of the stepped hole is a second hole portion for connecting and mating with the encoder shaft. The jig body is in a small clearance fit with both the motor shaft and the encoder shaft. An opening groove for avoiding the installation hole positions of the connecting screws of the motor shaft and the encoder shaft is provided on the jig body, and the opening groove corresponds to the screw installation hole positions one by one. An ejection plate is installed at the outer end of the jig body, and an ejection screw pointing to the stepped hole is threadedly connected to the ejection plate.

[0008] Preferably, the jig body is designed with an extended length, and this extended design can offset the influence of the clearance in the clearance fit on the assembly accuracy.

[0009] Preferably, the first hole portion and the second hole portion adopt a 5th-level precision.

[0010] Preferably, a plurality of installation holes for fixing the ejection plate are provided at the outer end of the jig body. A threaded hole for installing the ejection screw is provided in the middle of the ejection plate, and the outer diameter of the ejection screw is smaller than the minimum inner diameter of the stepped hole.

[0011] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0012] The jig positions the two-section shafts of the servo motor through the outer diameter, replacing the previous shaft-hole positioning. It changes the shaft holes that need to be finely processed in batches into a way of ordinary processing of stepped holes, and the jig body can be reused to save costs;

[0013] The extended design of the jig body can offset the influence of the clearance in the clearance fit on the assembly accuracy;

[0014] The design of the jig body converts the work that needs to be adjusted on-site during installation into a guarantee by the jig, saving working hours. It can combine installation and self-inspection into one step. Under normal circumstances, no other monitoring actions are required. Description of the Drawings

[0015] Figure 1 It is a schematic structural diagram of the two-section shafts of a servo motor.

[0016] Figure 2 It is a schematic structural diagram of a jig for assembling two-section shafts of a servo motor.

[0017] Figure 3 It is a partial schematic structural diagram of a jig for assembling two-section shafts of a servo motor.

[0018] Figure 4 It is a partial sectional view of a jig for assembling two-section shafts of a servo motor.

[0019] Figure 5 It is an assembly schematic diagram of a jig for assembling two-section shafts of a servo motor.

[0020] Among them, 01 is the motor shaft, 02 is the encoder shaft, 03 is the screw, 1 is the jig body, 11 is the first hole part, 12 is the second hole part, 13 is the opening groove, 14 is the mounting hole, 2 is the ejector plate, and 3 is the ejector screw. Specific embodiments

[0021] The following combines the accompanying drawings to elaborate on the preferred embodiments of the present invention in detail, so that the advantages and features of the invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0022] Please refer to Figures 2 to 5 , the embodiments of the present invention include:

[0023] The assembly of the motor shaft 01 and the encoder shaft 02 is as Figure 1 shown. The screw 03 passes through the flange surface of the encoder shaft 02 and is locked to the end face of the motor shaft 01. The four screws 03 are distributed in a concentric array.

[0024] A jig for assembling two-section shafts of a servo motor, the jig for assembling two-section shafts of a servo motor includes a jig body 1, an ejector plate 2 and an ejector screw 3. The jig body 1 is axially provided with a stepped hole. One end of the stepped hole is a first hole part 11 for connecting and mating with the motor shaft, and the other end of the stepped hole is a second hole part 12 for connecting and mating with the encoder shaft. The accuracy of the motor shaft 01 itself is the commonly used 6th-level accuracy, and the encoder shaft 02 adopts the 6th-level accuracy. The first hole part 11 and the second hole part 12 adopt the 5th-level accuracy. The jig body 1 and the motor shaft 01 and the encoder shaft 02 both adopt a small clearance fit. An opening groove 13 for avoiding the installation hole position of the connecting screw 03 between the motor shaft 01 and the encoder shaft 02 is opened on the jig body 1. The opening groove 13 corresponds to the installation hole position of the screw 03 one by one. An ejector plate 2 is installed at the outer end of the jig body 1, and a threaded ejector screw 3 pointing to the stepped hole is threadedly connected to the ejector plate 2.

[0025] The jig body 1 is designed with an extended length. If the jig body 1 is relatively short, there is a clearance in the small clearance fit between the jig body 1 and the motor shaft 01 and the encoder shaft 02. The clearance directly affects the docking accuracy of the motor shaft 01 and the encoder shaft 02 and affects the runout. The extended design can offset the influence of the clearance in the clearance fit on the assembly accuracy.

[0026] A plurality of mounting holes 14 for fixing the ejector plate 2 are provided at the outer end of the jig body 1. A threaded hole for installing the ejector screw 3 is provided in the middle of the ejector plate 2. The outer diameter of the ejector screw 3 is smaller than the minimum aperture of the stepped hole.

[0027] When the utility model is used for assembling a jig for servo motor two-section shafts, the encoder shaft 02 is installed on the motor shaft 01, specifically, the encoder shaft 02 is docked with the motor shaft 01, the screw 03 passes through the encoder shaft 02 and is locked to the motor shaft 01, and is locked by the screw 03, but not tightened, the jig body 1 passes through the encoder shaft 02 and is connected to the motor shaft 01, the jig body 1 is manually pressed, and the screw 03 is tightened through the opening groove 13 of the jig body 1 to lock and fix the encoder shaft 02 and the motor shaft 01, at this time, the jig body 1 is taken out and the installation is completed.

[0028] If part of the encoder shaft 02 is too tight against the jig body 1, the jig body 1 can be ejected with the help of the ejector screw 3 at the ejector plate 2. Specifically: lock the ejector plate 2 to the outer end surface of the jig body 1 with screws, connect the ejector screw 3 to the middle threaded hole of the ejector plate 2, rotate the ejector screw 3, and the ejector screw 3 will press against the encoder shaft 02. Continue to rotate the ejector screw 3 to eject the jig body 1. At this time, it is necessary to remeasure the lower runout. There is a certain probability that the defect is caused by the concentricity and verticality of the encoder shaft, and rework is required.

[0029] The utility model discloses a jig for assembling two-section shafts of a servo motor. The jig can avoid the requirement of machining accuracy of positioning holes and ensure the assembly accuracy. The motor shaft and the encoder shaft can be matched with clearance, which simplifies the assembly and is easy to install without the need for additional detection.

[0030] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A fixture for assembling two sections of shafts of a servo motor, characterized in that: It includes a jig body (1), an ejector plate (2) and an ejector screw (3). The jig body (1) is axially provided with a stepped hole. One end of the stepped hole is a first hole portion (11) for connecting and mating with the motor shaft, and the other end of the stepped hole is a second hole portion (12) for connecting and mating with the encoder shaft. The jig body (1) is in a small clearance fit with both the motor shaft (01) and the encoder shaft (02). An opening groove (13) for avoiding the mounting hole positions of the connecting screws (03) of the motor shaft (01) and the encoder shaft (02) is formed on the jig body (1). The opening groove (13) is in one-to-one correspondence with the screw (03) mounting hole positions. An ejector plate (2) is installed at the outer end of the jig body (1), and an ejector screw (3) pointing to the stepped hole is threadedly connected to the ejector plate (2).

2. A fixture for assembling two-section shafts of a servo motor according to claim 1, characterized in that: The jig body (1) is designed with an extended length.

3. A jig for assembling two sections of shafts of a servo motor according to claim 1, characterized in that: The first hole portion (11) and the second hole portion (12) adopt a 5th-level precision.

4. A fixture for assembling two sections of shafts of a servo motor according to claim 1, characterized in that: A plurality of mounting holes (14) for fixing the ejector plate (2) are arranged at the outer end of the jig body (1). A threaded hole for installing the ejector screw (3) is provided in the middle of the ejector plate (2). The outer diameter of the ejector screw (3) is smaller than the minimum aperture of the stepped hole.

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