Torque motor assembly method

Abstract

The invention discloses a torque motor assembly method. The method comprises the following steps: firstly installing an integrated bearing into a cast iron housing, and installing a brake pad on the bearing inner ring of the integrated bearing. After installing a piston and a front cover plate in the cast iron housing, the cast iron housing is turned over. Then, an encoder is installed and adjusted. After the motor stator is installed, an installation fixture is locked on the end of a motor column. A buffer is inserted into the inner hole of the integrated bearing. Then, the motor rotor is inserted into the cast iron housing. The motor rotor is assembled in place by buffering through the buffer. Finally, the installation fixture and the buffer are disassembled, a sealing ring and a sleeve are installed in the inner hole of the integrated bearing, and the rear end of the cast iron housing is sealed and installed through the rear cover plate. The invention avoids impact damage to the motor rotor during assembly, improves the assembly efficiency of the motor and the stability of the motor in use, avoids industrial accidents during motor assembly, and improves the safety of motor assembly.

Description

Technical Field

[0001] The invention relates to the field of motor manufacturing, and in particular to a torque motor assembly method. Background Art

[0002] At present, when assembling a torque motor, it is necessary to first assemble the motor stator into a cast iron housing, and then a worker holds the motor rotor, aligns the motor rotor with the motor drive shaft and inserts it into the cast iron housing. During the assembly of the motor rotor, since the motor rotor is a permanent magnet with very strong magnetic force, it is attracted by the magnetic force and the motor rotor will be quickly inserted into the cast iron housing. Since its magnetic attraction is too strong, it is easy to cause a violent collision between the motor rotor and the step surface of the motor drive shaft during assembly, which can easily cause damage to the motor rotor and easily injure the assembler's fingers. Therefore, when assembling a torque motor, workers need to be very careful when assembling the motor rotor, which makes assembly difficult and inefficient. After assembly, the motor rotor needs to be inspected to prevent it from being damaged by collision during assembly. If the motor rotor is damaged, the permanent magnet needs to be removed, resulting in low assembly efficiency, high assembly cost and frequent worker injuries. Summary of the invention

[0003] In order to overcome the above-mentioned defects, the present invention provides a torque motor assembly method, which can greatly improve the torque motor assembly efficiency and avoid damage to the motor rotor and injury to workers during the assembly process.

[0004] The technical solution adopted by the present invention to solve the technical problem is: a torque motor assembly method, the specific steps are as follows:

[0005] Step 1: Clean the cast iron housing;

[0006] Step 2: Install the deep groove ball bearing onto the integrated bearing;

[0007] Step 3: Install the integrated bearing into the cast iron housing;

[0008] Step 4: Install the brake pad onto the inner ring of the integrated bearing;

[0009] Step 5: Install the piston for driving the brake pad and the front cover plate with the sealing ring in the cast iron housing;

[0010] Step 6: Turn over the cast iron housing, install the encoder and calibrate the encoder;

[0011] Step 7: Install the motor stator into the cast iron housing and fix the motor stator and the cast iron housing;

[0012] Step 8: Fix the motor rotor to the inner ring of the integrated bearing;

[0013] Step 9: Install the inner hole sealing ring and sleeve of the integrated bearing (inner diameter 38, outer diameter 40);

[0014] Step 10: Install the rear cover of the cast iron housing.

[0015] As a further improvement of the present invention, the steps of installing the motor rotor in step eight are as follows:

[0016] (1) Remove the motor rotor and clean it;

[0017] (2) Lock the mounting fixture to the end of the motor rotor;

[0018] (3) Insert the buffer into the inner hole of the integrated bearing;

[0019] (4) Insert the motor rotor together with the mounting fixture into the cast iron housing. At the initial contact stage, the inner hole of the motor rotor contacts and guides the extended shaft of the buffer to slide down. As the motor rotor slides down, the inner end face of the mounting fixture contacts the upper end face of the extended shaft of the buffer. The motor rotor and the mounting fixture begin to decelerate and descend along with the extended shaft of the buffer, and finally stabilize and reach their positions.

[0020] (5) Remove the mounting fixture on the motor rotor;

[0021] (6) Remove the buffer.

[0022] As a further improvement of the present invention, the buffer is a hydraulic buffer, the extension shaft is fixedly mounted on the piston rod of the hydraulic buffer, and the outer diameter of the extension shaft is matched and guided with the inner hole diameter of the motor rotor.

[0023] As a further improvement of the present invention, a hollow guide sleeve is formed at the lower end of the extension shaft, and the guide sleeve is slidably arranged on the outer side of the upper end of the fixed end of the buffer in the longitudinal direction. A radially outwardly protruding stop ring is formed on the circumferential outer wall of the fixed end of the buffer, and the lower end of the guide sleeve is stopped by the radially outwardly protruding stop ring.

[0024] As a further improvement of the present invention, the fixed end of the buffer forms a step structure with an upper outer diameter smaller than a lower outer diameter, the inner hole of the guide sleeve at the lower end of the extension shaft is a step hole with a lower inner diameter larger than an upper inner diameter, and the diameter of the inner hole at the lower end of the guide sleeve is vertically guided and matched with the outer diameter of the lower end of the fixed end of the buffer.

[0025] As a further improvement of the present invention, the mounting fixture includes an annular horizontal connecting member and a barrel-shaped vertical stop member, the horizontal connecting member covers the upper end surface of the motor rotor and is locked on the upper end surface of the motor rotor by connecting bolts, the vertical stop member is coaxially fixed on the horizontal connecting member, the vertical stop member can be slidably mounted on the outside of the extension shaft of the buffer in the vertical direction, and a stop surface extending in the horizontal direction is formed at the upper end of the vertical stop member, and the stop surface stops on the upper end surface of the extension shaft of the buffer.

[0026] As a further improvement of the present invention, the vertical stop member is a hollow step sleeve structure with an inner diameter at the upper end smaller than the inner diameter at the lower end. The inner side wall at the lower end of the vertical stop member is vertically aligned with the inner ring surface of the horizontal connecting member, and the lower end surface of the vertical stop member is locked and connected with the upper end surface of the horizontal connecting member by connecting screws.

[0027] As a further improvement of the present invention, the integrated bearing includes a bearing outer ring, a bearing inner ring and a bearing roller. The bearing outer ring is rotatably sleeved on the outside of the bearing inner ring. A raceway is formed between the bearing outer ring and the bearing inner ring. The bearing roller is rollably arranged in the raceway. A connecting shaft for installing a front cover plate is integrally formed at one axial end of the bearing inner ring, and a drive shaft with a multi-step step structure for installing a deep groove ball bearing, an encoder and a motor rotor is integrally formed at the other axial end of the bearing inner ring.

[0028] As a further improvement of the present invention, the bearing rollers are cross rollers.

[0029] As a further improvement of the present invention, flange surfaces with a plurality of screw holes are respectively formed on the end surface of the connecting shaft, the end surface of the driving shaft and the step surface of the driving shaft, and each flange surface is respectively used to fix and connect the front cover plate, the motor rotor and the encoder.

[0030] The beneficial effects of the present invention are as follows: the present invention adopts an integrated bearing to assemble the motor rotor, encoder, front cover plate and front cover plate of the motor, and assembles the electronic rotor so that the motor rotor is assembled into the cast iron housing of the motor for a certain distance and then slowly descends and is assembled into place, thereby avoiding the collision between the motor rotor and the inner ring of the integrated bearing due to magnetic force during the assembly process of the motor rotor, avoiding damage to the motor rotor, improving the assembly efficiency of the motor and the stability of the motor, avoiding work-related accidents during the assembly process of the motor, and improving the safety of motor assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 Assemble the deep groove ball bearing status diagram for the one-piece bearing;

[0032] Figure 2 This is a diagram showing the state of the integrated bearing being installed in the cast iron housing;

[0033] Figure 3 This is the brake pad assembly completed state diagram;

[0034] Figure 4 Complete the state diagram for the encoder and motor stator assembly;

[0035] Figure 5 Start assembling the motor rotor.

[0036] Figure 6 This is the state diagram of the motor rotor rapidly descending to contact the buffer;

[0037] Figure 7 This is a diagram of the motor rotor being assembled in place;

[0038] Figure 8 This is a schematic diagram of the integrated bearing structure. DETAILED DESCRIPTION

[0039] Embodiment: A torque motor assembly method, the specific steps are as follows:

[0040] Step 1: Clean the cast iron housing 1;

[0041] Step 2: Install the deep groove ball bearing 2 onto the integrated bearing 3;

[0042] Step 3: Install the integrated bearing 3 into the cast iron housing 1;

[0043] Step 4: Install the brake pad 4 onto the bearing inner ring 15 of the integrated bearing 3;

[0044] Step 5: Install a piston for driving the brake pad 4 and a front cover plate including a sealing ring in the cast iron housing 1;

[0045] Step 6: Turn over the cast iron housing 1, install the encoder 5 and calibrate the encoder 5;

[0046] Step 7: Install the motor stator 6 into the cast iron housing and fix the motor stator and the cast iron housing 1;

[0047] Step 8: Fix the motor rotor 7 to the bearing inner ring 15 of the integrated bearing 3. The specific installation steps are as follows:

[0048] (1) Take out the motor rotor 7 and clean it;

[0049] (2) Lock the mounting fixture 8 to the end of the motor rotor 7;

[0050] (3) Insert the buffer 9 into the inner hole of the integrated bearing 3;

[0051] (4) The motor rotor 7 is inserted into the cast iron housing 1 together with the mounting fixture. At the initial contact stage, the inner hole of the motor rotor 7 contacts and guides the extended shaft 10 of the buffer 9 to slide downward. As the motor rotor 7 slides downward, the inner end surface of the mounting fixture 8 contacts the upper end surface of the extended shaft 10 of the buffer 9. The motor rotor 7 and the mounting fixture 8 begin to descend with the extended shaft 10 of the buffer 9 with buffering and deceleration, and finally smoothly reach their positions.

[0052] (5) Remove the mounting fixture 8 on the motor rotor 7;

[0053] (6) Take out the buffer 9;

[0054] Step 9: Install the inner hole sealing ring and sleeve (inner diameter 38 and outer diameter 40) of the integrated bearing 3;

[0055] Step 10: Install the rear cover plate of the cast iron housing 1.

[0056] During the assembly of the torque motor, the integrated bearing 3 is used to avoid the setting of the main shaft, thereby avoiding the cumulative error caused by the assembly of multiple parts, and improving the accuracy of the motor power output. The deep groove ball bearing 2 is also assembled on the integrated bearing, and the two bearings are supported at both ends of the axis, so that the power output shaft will not swing or vibrate during the high-speed rotation of the motor, thereby improving the power output accuracy.

[0057] During the assembly process of the motor rotor 7, the mounting fixture 8 is fixedly connected to the motor rotor 7 to form a whole. After the mounting fixture 8 is inserted into the cast iron housing 1 together with the motor rotor 7 for a certain distance, the inner end face of the mounting fixture 8 contacts the upper end face of the extended shaft 10 of the buffer 9, and the buffer 9 provides an upward buffering force to the mounting fixture 8, thereby slowing down the motor rotor 7 and slowly descending into place, thereby realizing a smooth assembly of the motor rotor 7, avoiding collision damage with the integrated bearing 3, improving the stability of the motor assembly, and avoiding injuries to workers during the assembly process.

[0058] The buffer 9 is a hydraulic buffer 9, and the extension shaft 10 is fixedly mounted on the piston rod of the hydraulic buffer 9, and the outer diameter of the extension shaft 10 is matched and guided with the inner hole diameter of the motor rotor 7. When the hydraulic buffer 9 is used, when the installation fixture 8 is pressed on the extension shaft 10, the piston rod of the hydraulic buffer 9 is moved downward by the pressure of the installation fixture 8, and the piston rod is slowly moved downward by the oil resistance in the hydraulic buffer 9 during the downward movement, thereby realizing the slow assembly of the motor rotor 7 and achieving the deceleration buffering effect. In addition, the buffer 9 can also be a spring or a friction resistance device, which can be used by giving the installation fixture 8 an upward buffering force. These are all equivalent replacements that can be easily thought of by those skilled in the art based on this patent and fall within the scope of protection of this patent.

[0059] A hollow guide sleeve 11 is formed at the lower end of the extension shaft 10. The guide sleeve 11 can be slidably sleeved on the outer side of the upper end of the fixed end of the buffer 9 in the longitudinal direction. A radially convex stop ring 12 is formed on the outer circumferential wall of the fixed end of the buffer 9. The lower end of the guide sleeve 11 stops at the radially convex stop ring 12. When the extension shaft 10 moves downward along with the motor rotor 7, the guide sleeve 11 thereon cooperates with the outer shell of the fixed end of the buffer 9 to guide, so as to prevent the extension shaft 10 and the piston of the oil pressure buffer 9 from tilting during the downward movement, resulting in jamming, and then causing the motor rotor 7 to be unable to be assembled in place.

[0060] The fixed end of the buffer 9 forms a step structure with an upper end outer diameter smaller than the lower end outer diameter, and the inner hole of the guide sleeve 11 at the lower end of the extension shaft 10 is a step hole with a lower end inner diameter larger than the upper end inner diameter, and the inner hole diameter of the lower end of the guide sleeve 11 is vertically matched with the outer diameter of the lower end of the fixed end of the buffer 9. Through the step structure, the extension shaft 10 can smoothly move downward with the piston rod.

[0061] The installation jig 8 includes an annular horizontal connector and a barrel-shaped vertical stopper. The horizontal connector covers the upper surface of the motor rotor 7 and is locked on the upper surface of the motor rotor 7 by connecting bolts. The vertical stopper is coaxially fixed on the horizontal connector. The vertical stopper can be slidably sleeved on the outer side of the extension shaft 10 of the buffer 9 in the vertical direction. The upper end of the vertical stopper forms a stopper surface 13 extending in the horizontal direction. The stopper surface 13 stops on the upper end surface of the extension shaft 10 of the buffer 9. By designing the installation jig 8 as a split structure of a horizontal connector and a vertical stopper, different passable vertical stoppers or horizontal connectors can be replaced according to the specifications of the torque motor to assemble the motor rotor 7 of the torque motor, thereby making the installation jig 8 suitable for the assembly of torque motors of different specifications. At the same time, the motor rotor 7 can be quickly lowered to the position where it is about to be assembled before buffering, thereby ensuring assembly efficiency.

[0062] The vertical stopper is a hollow step sleeve structure with an inner diameter at the upper end smaller than that at the lower end. The inner side wall at the lower end of the vertical stopper is vertically aligned with the inner ring surface of the horizontal connector. The lower end surface of the vertical stopper is locked and connected with the upper end surface of the horizontal connector by connecting screws.

[0063] The integrated bearing 3 includes a bearing outer ring 14, a bearing inner ring 15 and bearing rollers. The bearing outer ring 14 is rotatably sleeved on the outside of the bearing inner ring 15. A raceway 16 is formed between the bearing outer ring 14 and the bearing inner ring 15. The bearing rollers are rollably arranged in the raceway 16. A connecting shaft 17 for installing a front cover plate is integrally formed at one axial end of the bearing inner ring 15, and a driving shaft 18 with a multi-step structure for installing a deep groove ball bearing 2, an encoder 5 and a motor rotor 7 is integrally formed at the other axial end of the bearing inner ring 15.

[0064] The bearing rollers are cross rollers. The use of cross rollers enables the integrated bearing 3 to withstand radial and axial forces, thereby improving the strength of the bearing.

[0065] Flange surfaces with a plurality of screw holes are respectively formed on the end surface of the connecting shaft 17 , the end surface of the driving shaft and the step surface of the driving shaft, and each flange surface is used for fixing and connecting the front cover plate, the motor rotor 7 and the encoder 5 .

Claims

1. A torque motor assembly method, Features: The specific steps are as follows: Step 1: Clean the cast iron housing (1); Step 2: Install the deep groove ball bearing (2) onto the integrated bearing (3); Step 3: Install the integrated bearing into the cast iron housing; Step 4: Install the brake pad (4) onto the inner ring of the bearing of the integrated bearing; Step 5: Install the piston for driving the brake pad and the front cover plate with the sealing ring in the cast iron housing; Step 6: Turn over the cast iron housing, install the encoder (5) and calibrate the encoder; Step 7: Install the motor stator (6) into the cast iron housing and fix the motor stator and the cast iron housing; Step 8: Fix the motor rotor (7) to the inner ring of the integrated bearing. The steps for installing the motor rotor are as follows: (1) Remove the motor rotor and clean it; (2) Lock the mounting fixture (8) to the end of the motor rotor; (3) inserting the buffer (9) into the inner hole of the integrated bearing; (4) Insert the motor rotor together with the mounting fixture into the cast iron housing. At the initial contact stage, the inner hole of the motor rotor contacts and guides the extended shaft of the buffer to slide downward. As the motor rotor slides downward, the inner end surface of the mounting fixture contacts the upper end surface of the extended shaft (10) of the buffer. The motor rotor and the mounting fixture begin to descend with the extended shaft of the buffer in a buffered and decelerated manner, and finally smoothly reach their positions. (5) Remove the mounting fixture on the motor rotor; (6) Remove the buffer; Step 9: Install the inner hole sealing ring and sleeve of the integrated bearing; Step 10: Install the rear cover of the cast iron housing; The integrated bearing comprises a bearing outer ring (14), a bearing inner ring (15) and bearing rollers, wherein the bearing outer ring is rotatably sleeved on the outer side of the bearing inner ring, a raceway (16) is formed between the bearing outer ring and the bearing inner ring, and the bearing rollers are rollably arranged in the raceway, a connecting shaft (17) for mounting a front cover plate is integrally formed at one axial end of the bearing inner ring, and a driving shaft (18) with a multi-step structure for mounting a deep groove ball bearing, an encoder and a motor rotor is integrally formed at the other axial end of the bearing inner ring.

2. The torque motor assembly method according to claim 1, Features: The buffer is a hydraulic buffer, the extension shaft is fixedly mounted on the piston rod of the hydraulic buffer, and the outer diameter of the extension shaft is matched with the inner hole diameter of the motor rotor for guidance.

3. The torque motor assembly method according to claim 2, Features: A hollow guide sleeve (11) is formed at the lower end of the extension shaft, and the guide sleeve is slidably arranged on the outer side of the upper end of the fixed end of the buffer in the longitudinal direction. A radially outwardly protruding stop ring (12) is formed on the circumferential outer wall of the fixed end of the buffer, and the lower end of the guide sleeve is stopped by the radially outwardly protruding stop ring.

4. The torque motor assembly method according to claim 3, Features: The fixed end of the buffer forms a step structure with an upper outer diameter smaller than the lower outer diameter, the inner hole of the guide sleeve at the lower end of the extended shaft is a step hole with a lower inner diameter larger than the upper inner diameter, and the inner hole diameter of the lower end of the guide sleeve is vertically matched with the outer diameter of the lower end of the fixed end of the buffer.

5. The torque motor assembly method according to claim 1, Features: The mounting fixture comprises an annular horizontal connecting piece and a barrel-shaped vertical stopper, wherein the horizontal connecting piece covers the upper end surface of the motor rotor and is locked on the upper end surface of the motor rotor by connecting bolts, and the vertical stopper is coaxially fixed on the horizontal connecting piece, and the vertical stopper can be slidably sleeved on the outer side of the extension shaft of the buffer in the vertical direction, and the upper end of the vertical stopper forms a stopper surface (13) extending in the horizontal direction, and the stopper surface stops on the upper end surface of the extension shaft of the buffer.

6. The torque motor assembly method according to claim 5, Features: The vertical stopper is a hollow step sleeve structure with an inner diameter at the upper end smaller than that at the lower end. The inner side wall at the lower end of the vertical stopper is vertically aligned with the inner ring surface of the horizontal connector. The lower end surface of the vertical stopper is locked and connected with the upper end surface of the horizontal connector by connecting screws.

7. The torque motor assembly method according to claim 1, Features: The bearing rollers are cross rollers.

8. The torque motor assembly method according to claim 1, Features: Flange surfaces with a plurality of screw holes are respectively formed on the end surface of the connecting shaft, the end surface of the driving shaft and the step surface of the driving shaft, and each flange surface is respectively used for fixing and connecting the front cover plate, the motor rotor and the encoder.

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