Large-torque power-assisted steering motor

Abstract

The invention relates to the technical field of motors, in particular to a large-torque power-assisted steering motor which comprises a motor shell, a stator chamber is arranged in the motor shell, and a stator assembly is detachably connected in the stator chamber; epoxy glue is brushed on the outer wall of the stator core, and the epoxy glue is filled between the outer wall of the stator core and the inner wall of the stator chamber; the position of the first arc-shaped columnar groove corresponds to the position of the second arc-shaped columnar groove, and a cylindrical positioning groove is formed; a stator positioning pin is inserted into the cylindrical positioning groove; a plurality of stator fixing holes are uniformly formed in the edge of the inner wall of the stator chamber, locking sub-screws are connected to the stator fixing holes, and nuts of the locking sub-screws tightly press the edge of the stator core. Compared with the prior art, the stator assembly of the large-torque power-assisted steering motor has reversibility, the assembly process is flexible, if defects exist in the motor assembly process, the motor can be disassembled for maintenance, the use cost is low, the scrap of defective products is reduced, and the waste cost of materials is saved.

Description

Technical Field

Background Art

[0003] The existing stator assembly process is hot-state tight fitting, that is, the size of the stator chamber of the housing is smaller than the outer diameter of the motor stator. During the production process, through an electric frequency heating device, the stator chamber of the housing expands thermally, and the size slightly increases. Then, a machine is used to press the stator into the stator chamber of the housing. In the case of thermal expansion, the stator is tightly fitted in the housing. When it returns to normal temperature, this tight fitting effect is even tighter.

[0004] During the process of hot-state tight fitting of the stator, once the stator is installed in the housing, it cannot be taken out. And only when the motor is finally assembled can the specific performance indicators of the motor be tested. If there are defective products during the test, they can only be scrapped. The material cost of medium and large motors is relatively high, increasing the production cost of the motor.

[0005] The hot-state tight fitting process of the stator requires the support of more machinery and tooling fixtures. The motor assembly is bulky and inflexible, which hinders the time process of sample making and small-batch testing. It also makes it necessary to invest a high cost in machinery and tooling fixtures during sample and small-batch production. The upfront R & D investment cost is relatively high, which is not conducive to the development and innovation of the industry.

Summary of the Invention

[0007] A technical solution provided by the present invention to solve the above technical problems is: to provide a large-torque power-assisted steering motor, including a motor housing, a stator chamber is arranged inside the motor housing, and a stator assembly is detachably connected inside the stator chamber; the stator assembly includes a stator core, wire frames for winding are arranged on the upper and lower sides of the stator core, epoxy glue is brushed on the outer wall of the stator core, and the epoxy glue fills the space between the outer wall of the stator core and the inner wall of the stator chamber; a concave first arc-shaped columnar groove is arranged on the outer wall of the stator core, a concave second arc-shaped columnar groove is arranged on the inner wall of the stator chamber, the position of the first arc-shaped columnar groove corresponds to the position of the second arc-shaped columnar groove and forms a cylindrical positioning groove, and a stator positioning pin is inserted into the cylindrical positioning groove; a plurality of stator fixing holes are evenly arranged on the edge of the inner wall of the stator chamber, locking stator screws are connected to the stator fixing holes, and the nuts of the locking stator screws press the edge of the stator core. Preferably, the directions of the cylindrical positioning groove and the stator positioning pin are both parallel to the axial direction of the stator core.

[0008] Preferably, the high-torque power steering motor further includes a rotor assembly. A rotor mounting groove is provided in the middle of the stator core, and the rotor assembly is located in the rotor mounting groove. The rotor assembly includes a motor shaft and a rotor core. The rotor core is sleeved on the motor shaft, and the rotor core and the motor shaft are bonded together with glue.

[0009] Preferably, a rotor positioning hole is provided in the side wall of the motor shaft, a rotor positioning pin is inserted into the rotor positioning hole, a rotor positioning groove is provided in the inner side wall of the rotor core, and one end of the rotor positioning pin extends out of the rotor positioning hole and is inserted into the rotor positioning groove.

[0010] Preferably, a rotor magnet is connected to the outer wall of the rotor core. The rotor magnet is a 32-pole high-strength magnet, and the rotor magnet is pasted on the outer wall of the rotor core with glue.

[0011] Preferably, a first bearing is press-fitted into the motor housing, an insulating gasket is placed at the bottom inside the motor housing, and the stator assembly is loosely fitted in the stator chamber inside the motor housing. The high-torque power steering motor includes a motor middle cover, a second bearing is press-fitted on the motor middle cover, and the motor middle cover is locked to the motor housing with screws. The stator assembly and the rotor assembly are located between the motor middle cover and the motor housing, and both ends of the motor shaft are respectively inserted into the first bearing and the second bearing.

[0012] Preferably, a layer of insulating gasket is provided on the inner side wall of the motor middle cover, and the wire frame is located between the two layers of insulating gaskets.

[0013] Preferably, the high-torque power steering motor includes a motor rear cover. The motor rear cover is locked to the motor housing with screws, and the motor middle cover is located between the motor housing and the motor rear cover. A sealing ring is press-fitted at the connection between the motor rear cover and the motor housing.

[0014] Preferably, a Hall plate and an induction magnetic ring are provided between the motor middle cover and the motor rear cover. The Hall plate is located on one side of the induction magnetic ring. A signal decoding board is provided between the motor middle cover and the motor rear cover. An aviation plug is connected to the signal decoding board. One end of the aviation plug extends out of the motor rear cover. An insulating EVA sticker is provided between the signal decoding board and the motor rear cover.

[0015] Preferably, a rear cover side oil seal is press-fitted inside the motor rear cover, and a front end oil seal is installed at the front end of the motor housing.

[0016] Compared with the prior art, the stator assembly of the high-torque power steering motor of the present invention has reversibility, the assembly process is flexible, and in the process of motor assembly, if there are defects, it can be disassembled and repaired, the use cost is relatively low, the scrapping of defective products is reduced, and the waste cost of materials is saved. The flexible assembly process is beneficial to the design and research and development of new products of similar motors, and the early-stage time and economic cost investment are relatively low.

BRIEF DESCRIPTION OF THE DRAWINGS

DETAILED DESCRIPTION OF THE INVENTION

[0019] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only relative positions on the specified views, rather than absolute positions.

[0020] In addition, the descriptions such as "first" and "second" in the present invention are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0021] Please refer to Figures 1 to 6 , the high-torque power-assisted steering motor of the present invention can be mainly used for power-assisted steering of the steering wheel of an agricultural tractor, with a load torque of up to 10 N•m, having a relatively high fatigue life, and the motor belongs to a medium and large-sized motor.

[0022] The high-torque power-assisted steering motor of the present invention includes a motor housing 11, a stator chamber 111 is arranged inside the motor housing 11, and a stator assembly is detachably connected inside the stator chamber 111.

[0023] The stator assembly includes a stator core 20. Wire racks 21 for winding are provided on the upper and lower sides of the stator core 20. After winding, epoxy glue is brushed on the outer wall of the stator core 20, and the epoxy glue is filled between the outer wall of the stator core 20 and the inner wall of the stator chamber 111. The epoxy glue can be cured only after being baked at a high temperature for a certain time, so that the stator assembly is bonded to the motor housing 11.

[0024] A concave first arc-shaped columnar groove 22 is provided on the outer wall of the stator core 20, and a concave second arc-shaped columnar groove 113 is provided on the inner wall of the stator chamber 111. The position of the first arc-shaped columnar groove 22 corresponds to the position of the second arc-shaped columnar groove 113 to form a cylindrical positioning groove, and a stator positioning pin 50 is inserted into the cylindrical positioning groove.

[0025] A plurality of stator fixing holes 112 are uniformly provided at the edge of the inner wall of the stator chamber 111. Locking stator screws are connected to the stator fixing holes 112, and the nuts of the locking stator screws press the edge of the stator core 20, so that the stator cannot move axially.

[0026] The directions of the cylindrical positioning groove and the stator positioning pin 50 are both parallel to the axis of the stator core 20, so that the stator cannot move in the circumferential direction.

[0027] The high-torque power-assisted steering motor of the present invention further includes a rotor assembly. A rotor installation groove is provided in the middle of the stator core 20, and the rotor assembly is located in the rotor installation groove.

[0028] The rotor assembly includes a motor shaft 40 and a rotor core 30. The rotor core 30 is sleeved on the motor shaft 40, and the rotor core 30 and the motor shaft 40 are bonded together by glue.

[0029] A rotor positioning hole 41 is provided on the side wall of the motor shaft 40, a rotor positioning pin 60 is inserted into the rotor positioning hole 41, a rotor positioning groove 32 is provided on the inner side wall of the rotor core 30, and one end of the rotor positioning pin 60 extends out of the rotor positioning hole 41 and is inserted into the rotor positioning groove 32. During the use of the motor, there is no axial pushing or pulling force of the rotor core 30 relative to the motor shaft 40, and only glue bonding is required. However, the rotor core 30 has a large rotational force relative to the motor shaft 40. The installation of the rotor positioning pin 60 ensures that there is no displacement in the circumferential direction between the rotor core 30 and the motor shaft 40, and has better synchronism.

[0030] A rotor magnet 31 is connected to the outer wall of the rotor core 30. The rotor magnet 31 is a 32-pole strong magnet, and the rotor magnet 31 is pasted on the outer wall of the rotor core 30 by glue. After the rotor is manufactured, the glue is baked in an oven to become a finished rotor.

[0031] A first bearing 17 is press-fitted inside the motor housing 11. A layer of insulating gasket 18 is placed at the inner bottom of the motor housing 11. The stator assembly is loosely fitted in the stator chamber 111 inside the motor housing 11. When the epoxy glue is in an unbaked state, the stator assembly can be inserted into or removed from the stator chamber 111 an unlimited number of times.

[0032] After the stator assembly is placed in the stator chamber 111 inside the motor housing 11, the stator locating pin 50 is placed in the cylindrical locating groove between the stator and the housing. The placement of the stator locating pin 50 prevents the stator from moving in the circumferential direction. Six stator locking screws are locked into the stator fixing holes 112 in the housing. Due to the pressing of the nuts, the stator is prevented from moving axially. Epoxy glue is used for both the stator locating pin 50 and the stator locking screws during the assembly process, and the unbaked state also has the reversibility of assembly and removal.

[0033] The high-torque power-assisted steering motor of the present invention includes a motor middle cover 12. A second bearing 16 is press-fitted on the motor middle cover 12. The motor middle cover 12 is locked to the motor housing 11 by screws. The stator assembly and the rotor assembly are located between the motor middle cover 12 and the motor housing 11.

[0034] Both ends of the motor shaft 40 are respectively inserted into the first bearing 17 and the second bearing 16.

[0035] The motor rotor has a relatively large magnetism. When the rotor is installed in the stator, with the help of auxiliary equipment, the rotor can be installed in the stator or removed from the stator without damage. When the rotor is installed in the stator, the motor rotor shaft sleeve is on the bearing inside the housing. In this state, the motor can be powered on for testing. During this testing stage, if there are problems such as electric leakage, insulation, short circuit or poor electrical performance, it is generally due to the stator being defective. After the rotor is removed, the stator can be taken out of the housing for analysis and repair, avoiding waste of related materials during the manufacturing process.

[0036] After the testing stage is OK, silicone rubber for preventing vibration is applied to the heads of the stator locating pin 50 and the stator locking screws to ensure the fatigue reliability of the motor in the final use scenario.

[0037] A layer of insulating gasket 18 is provided on the inner side wall of the motor middle cover 12. The wire frame 21 is located between the two layers of insulating gaskets 18.

[0038] The high-torque power-assisted steering motor of the present invention includes a motor rear cover 13. The motor rear cover 13 is locked to the motor housing 11 by screws. The motor middle cover 12 is located between the motor housing 11 and the motor rear cover 13.

[0039] A sealing ring 19 is press-fitted at the connection between the motor rear cover 13 and the motor housing 11 for preventing mud and water.

[0040] A Hall plate 80 and an induction magnetic ring 81 are arranged between the middle cover 12 and the rear cover 13 of the motor, and the Hall plate 80 is located on one side of the induction magnetic ring 81.

[0041] A signal decoding board 70 is arranged between the middle cover 12 and the rear cover 13 of the motor. An aviation plug 71 is connected to the signal decoding board 70. One end of the aviation plug 71 extends out of the rear cover 13 of the motor. An insulating EVA sticker 72 is arranged between the signal decoding board 70 and the rear cover 13 of the motor.

[0042] After the bearing is press-fitted into the middle cover 12 of the motor, it is locked to the motor housing 11 by screws. Then, components such as the magnetic ring and the induction Hall plate are installed. The assembly at this stage is also reversible.

[0043] A rear cover side oil seal 15 is press-fitted into the rear cover 13 of the motor. The aviation plug 71 and the mud-proof sealing ring 19 are installed. The motor lead wire is connected to the aviation plug 71. The rear cover is locked into the motor housing 11 by screws. The front end oil seal 14 is installed at the front end of the motor housing 11 to complete the assembly of the motor.

[0044] For the large-torque power-assisted steering motor of the present invention, when the glue is not baked, it can be further tested on the machine in the actual scenario, and data analysis and defect correction can be carried out. Or after the glue is baked, it can be directly applied to the actual use scenario for a long time.

[0045] The large-torque power-assisted steering motor of the present invention has a large load and a relatively large volume. The outer diameter of the motor housing 11 can reach 170 mm, and the rated torque of the motor is 10 N•m. The stator assembly is reversible, making the assembly process more flexible and operable. It is conducive to design and R & D innovation, and the production cost of small batches is controllable, reducing waste in the material stage of mass production processes.

[0046] The large-torque power-assisted steering motor of the present invention has the following characteristics: 1. The motor has a large volume and torque, and the load torque can reach 10 N•m. The motor is used for power-assisted steering of the steering wheel of an agricultural tractor and has reliable fatigue resistance. The external environment of the motor has sludge, and it is necessary to have the effect of preventing mud and water.

[0047] 2. After the stator of the motor is installed with a wire frame and wound with wire, the periphery of the stator is brushed with glue and loosely assembled in the motor housing. If there are defects during the production process, the stator can be taken out for replacement or repair. Only when the whole motor passes the test as a good product, the glue is baked and bonded firmly.

[0048] 3. During the production process, six screws lock the stator to fix it between the stator and the housing, so that the stator cannot move axially; the stator fixing pin is inserted into the round hole formed between the stator and the housing, so that the stator is fixed in the circumferential direction.

[0049] 4. There is a rotor core outside the motor shaft. The rotor core and the motor shaft are fixed by pins and glue. There are motor magnets attached to the outer wall of the rotor. When under a large torque load, the pins prevent the rotor from moving circumferentially relative to the motor shaft.

[0050] 5. The motor rotor has 32 strong magnets with a large magnetic attraction. During the assembly process, with the aid of an auxiliary fixture, the rotor can be freely inserted or removed without damage, ensuring that the stator of the motor to be assembled is in good condition before assembling the motor into a finished product.

[0051] 6. The key of the present invention is the large torque load motor, which has a very high material cost. During the assembly process, it is reversible, enabling defective stators to be removed for repair or repeated assembly, reducing material waste and greatly reducing the production cost.

[0052] 7. Except for inserting or removing the rotor with the aid of an auxiliary fixture, other operations of the present invention can be flexibly performed by hand. The assembly process is relatively simple, with high production efficiency, which is beneficial to the control of mass production costs or the flexibility of small batch sample production.

[0053] Compared with the prior art, the stator assembly of the large torque assist steering motor of the present invention is reversible, the assembly process is flexible, and if there are defects during the motor assembly process, it can be disassembled for repair, with a lower usage cost, reducing the scrapping of defective products and saving the waste cost of materials; the flexible assembly process is conducive to the design and research and development of new products of similar motors, resulting in lower early-stage time and economic cost investments.

[0054] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any modifications, equivalent substitutions, improvements, etc. made within the concept of the present invention shall be included within the patent protection scope of the present invention.

Claims

1. A high-torque power-assisted steering motor, characterized in that, It includes a motor housing, a stator chamber is arranged inside the motor housing, and a stator assembly is detachably connected inside the stator chamber; The stator assembly includes a stator core. Winding frames for winding are arranged on the upper and lower sides of the stator core. Epoxy glue is brushed on the outer wall of the stator core, and the epoxy glue is filled between the outer wall of the stator core and the inner wall of the stator chamber; A concave first arc-shaped columnar groove is arranged on the outer wall of the stator core, and a concave second arc-shaped columnar groove is arranged on the inner wall of the stator chamber. The position of the first arc-shaped columnar groove corresponds to the position of the second arc-shaped columnar groove and forms a cylindrical positioning groove, and a stator positioning pin is inserted into the cylindrical positioning groove; A plurality of stator fixing holes are evenly arranged on the edge of the inner wall of the stator chamber. Stator locking screws are connected to the stator fixing holes, and the nuts of the stator locking screws press against the edge of the stator core.

2. The high-torque power-assisted steering motor according to claim 1, wherein The directions of the cylindrical positioning groove and the stator positioning pin are both parallel to the axial direction of the stator core.

3. The high-torque assist steering motor according to claim 1, wherein, The high-torque power-assisted steering motor further includes a rotor assembly. A rotor installation groove is arranged in the middle of the stator core, and the rotor assembly is located in the rotor installation groove; the rotor assembly includes a motor shaft and a rotor core. The rotor core is sleeved on the motor shaft, and the rotor core and the motor shaft are bonded together with glue.

4. The high-torque assist steering motor according to claim 3, wherein A rotor positioning hole is opened on the side wall of the motor shaft, a rotor positioning pin is inserted into the rotor positioning hole, a rotor positioning groove is opened on the inner side wall of the rotor core, and one end of the rotor positioning pin extends out of the rotor positioning hole and is inserted into the rotor positioning groove.

5. The high-torque power-assisted steering motor according to claim 3, wherein, A rotor magnet is connected to the outer wall of the rotor core. The rotor magnet is a 32-pole strong magnet, and the rotor magnet is pasted on the outer wall of the rotor core with glue.

6. The high-torque power-assisted steering motor according to claim 3, characterized in that, A first bearing is press-fitted into the motor housing. A layer of insulating gasket is placed at the bottom inside the motor housing. The stator assembly is loosely fitted in the stator chamber inside the motor housing; the high-torque power-assisted steering motor includes a motor middle cover. A second bearing is press-fitted on the motor middle cover. The motor middle cover is locked to the motor housing with screws. The stator assembly and the rotor assembly are located between the motor middle cover and the motor housing, and both ends of the motor shaft are respectively inserted into the first bearing and the second bearing.

7. The high-torque power-assisted steering motor according to claim 6, wherein A layer of insulating gasket is arranged on the inner side wall of the motor middle cover, and the winding frame is located between the two layers of insulating gaskets.

8. The high-torque power-assisted steering motor according to claim 6, wherein The high-torque power-assisted steering motor includes a motor rear cover. The motor rear cover is locked to the motor housing with screws. The motor middle cover is located between the motor housing and the motor rear cover; a sealing ring is press-fitted at the connection between the motor rear cover and the motor housing.

9. The high-torque assist steering motor according to claim 8, characterized in that, A Hall plate and an induction magnetic ring are arranged between the motor middle cover and the motor rear cover. The Hall plate is located on one side of the induction magnetic ring; a signal decoding board is arranged between the motor middle cover and the motor rear cover. An aviation plug is connected to the signal decoding board. One end of the aviation plug extends out of the motor rear cover. An insulating EVA sticker is arranged between the signal decoding board and the motor rear cover.

10. The high-torque assist steering motor according to claim 8, characterized in that, A rear cover side oil seal is press-fitted inside the motor rear cover, and a front end oil seal is installed at the front end of the motor housing.

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