Motor brake structure and motor

Abstract

The utility model relates to the technical field of motors, in particular to a motor brake structure and a motor, the motor brake structure is used for static self-locking of the motor, the motor brake structure comprises a rear cover, a matching part, a brake pad and a bearing, the rear cover is provided with a concave part, the matching part and the concave part are integrally formed, and the matching part and the concave part form a concave groove of the rear cover. An assembling groove is formed in the middle of the matching part, the brake pad is installed in the assembling groove and is relatively fixed to the assembling groove through a limiting structure, the bearing is installed in the assembling groove and is located on the brake pad, the brake pad is provided with a clamping hole, and a shaft core of the motor penetrates through the clamping hole and is in running fit with the bearing. And the shaft core is clamped by the brake pad through the clamping hole. The self-locking device is good in self-locking effect, compact in structure and beneficial to reduction of production cost.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, specifically to a motor brake structure and a motor. Background Technology

[0002] Lifting motors are used in smart home applications, such as smart sofas, clothes racks, or smart lifting tables. When used in smart lifting tables, the motor can drive the tabletop to rise or fall to adjust it to a suitable height.

[0003] Taking a smart height-adjustable desk as an example, if a motor without a brake is used, the desktop will slide downwards under significant gravity, affecting usability. Currently, motors with brakes utilize the attraction between magnets and an iron core to achieve self-locking. However, using motors with electromagnetic brakes results in increased size and material costs.

[0004] To reduce the size of the motor, a solution was found through a search: Patent announcement number CN220122727U discloses a motor brake structure and a motor. The motor brake structure includes a rear cover body, which comprises a mounting part and a mating part connected to each other. The mating part is located in the middle of the mounting part and forms an assembly groove. This motor brake structure has good self-locking effect, a compact structure, and low cost, thus solving the aforementioned problems.

[0005] However, research on the motor brake structure and motor design revealed that the rear cover body of this design protrudes outwards due to the mating part being different from existing conventional stamping (e.g., Figure 5 The consistent design of the inner and outer protrusions (a) results in a relatively longer rear cover, which is not conducive to further shortening the overall axial size of the motor. Therefore, the overall axial size of the motor needs to be further reduced to achieve optimization. Utility Model Content

[0006] The purpose of this utility model is to provide a motor braking structure and a motor to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A motor brake structure for static self-locking of a motor, the motor brake structure comprising:

[0009] The rear cover has a recessed portion.

[0010] The mating part is integrally formed with the recessed part and together with the recessed part forms a recessed groove for the back cover;

[0011] The mating part is located in the middle and forms an assembly groove;

[0012] Brake pads are installed in the mounting groove and are fixed relative to the mounting groove by a limiting structure.

[0013] The bearing is mounted in the mounting slot and is located on the brake pad;

[0014] The brake pad has a locking hole;

[0015] The motor shaft passes through the clamping hole and rotates with the bearing, and the brake pad clamps the shaft through the clamping hole.

[0016] Furthermore, the brake pads are arranged symmetrically on the rear cover, and locking holes are formed between the brake pads.

[0017] Furthermore, the assembly groove contains grease, the brake pad is immersed in the grease, and the inner side of the brake pad has oil grooves distributed along the axial direction of the brake pad.

[0018] Furthermore, a clamping spring is fitted onto the brake pad, and anti-disengagement parts that limit the clamping spring are located at both the upper and lower ends of the brake pad.

[0019] Furthermore, the inner diameter of the clamping spring is smaller than the outer diameter of the brake pad, and the clamping hole will clamp the shaft after assembly with the shaft core, which is used for static self-locking of the motor.

[0020] Furthermore, the limiting structure includes an inwardly rivet positioning point at the bottom of the rear cover and a positioning groove at the bottom of the brake pad that is adapted to engage with the rivet positioning point.

[0021] Furthermore, the rear cover has pre-drilled mounting holes.

[0022] Furthermore, the brake pads are made of high-temperature resistant materials.

[0023] Furthermore, it also includes a riveted bearing spring, wherein the connection between the mating part and the recessed part is an annular pressing groove, and the riveted bearing spring is assembled in the pressing groove to fit and press the bearing.

[0024] To achieve the above objectives, this utility model also provides the following technical solution:

[0025] An electric motor, the electric motor including the above-described motor braking structure.

[0026] Compared with the prior art, the beneficial effects of this utility model are:

[0027] 1. The back cover is stamped inward to form a recessed part. After the reverse stamping, the outward protrusion of the mating part is small, which will reduce the length of the back cover protruding outside the motor housing. In this way, the motor and its housing will not appear too long, so the motor and motor brake structure can be more compact.

[0028] 2. The brake pads and retaining springs are located inside the mounting slots of the rear cover. The grease in the rear cover wets the brake pads and oil grooves, which enhances the heat dissipation effect and improves the life of the brake pads.

[0029] 3. The limiting structure can prevent the brake pads from rotating along the axial direction of the shaft core in the assembly groove, so that the brake pads are relatively fixed in the assembly groove. Then, the bearing assembly is pressed by the riveting bearing spring, which can make the motor brake structure of this solution have good self-locking effect, stable self-locking effect and compact structure.

[0030] 4. Placing the grease in the closed tail cap will reduce grease loss and improve the service life of the oil-impregnated bearing. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of this utility model.

[0032] Figure 2 This utility model Figure 1 A diagram showing the view from below.

[0033] Figure 3 This utility model Figure 2 A schematic diagram of its breakdown.

[0034] Figure 4 This utility model Figure 1 Schematic diagram of cross-section at point AA.

[0035] Figure 5 This is a schematic diagram of a prior art motor.

[0036] Figure 6 This is a schematic diagram of the motor of this utility model.

[0037] Figure 7 This utility model Figure 6 Schematic diagram of cross-section at point BB.

[0038] In the diagram: 1-back cover, 2-recessed groove, 3-fitting part, 4-pressing groove, 5-riveting positioning point, 6-mounting hole, 7-anti-detachment part, 8-assembly groove, 9-oil groove, 10-positioning groove, 11-brake pad, 12-clamping spring, 13-limiting structure, 14-bearing, 15-riveted bearing spring, 16-recessed part, 17-clamping hole, 18-motor, 19-shaft core, 20-gap, 21-connecting part, 22-arc shape, 23-opening, 24-gap. Detailed Implementation

[0039] 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.

[0040] In the description of this utility model, it should be noted that the terms "upper end," "lower end," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0041] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0042] Please see Figures 1 to 7 This utility model provides a technical solution:

[0043] A motor brake structure for static self-locking of motor 18, the motor brake structure comprising:

[0044] Rear cover 1, the rear cover 1 having an inwardly recessed portion 16,

[0045] The mating part 3 is integrally formed with the recessed part 16 and together with the recessed part 16 forms the recessed groove 2 of the rear cover 1;

[0046] The mating part 3 is located in the middle and forms an assembly groove 8;

[0047] Brake pad 11, the brake pad 11 is installed in the assembly groove 8 and is fixed relative to the assembly groove 8 by the limiting structure 13;

[0048] The bearing 14 is installed in the mounting groove 8 and is located on the brake pad 11. Since the outer side of the bearing 14 is arc-shaped 22, the inner diameter of the upper and lower end faces of the bearing 14 is smaller than the inner diameter of the middle part. The inner diameter of the opening 23 of the mounting groove 8 is the same as the inner diameter of the middle part of the bearing 14, but slightly larger than the inner diameter of the middle part. Therefore, the bearing 14 can be stuck in the opening 23 of the mounting groove 8 and inserted into the mounting groove 8 at the bottom, but there is a gap 24 between it and the brake pad 11, which can restrict the axial movement of the brake pad 11.

[0049] The brake pad 11 has a locking hole 17;

[0050] The shaft 19 of the motor 18 passes through the clamping hole 17 and rotates with the bearing 14, and the brake pad 11 clamps the shaft 19 through the clamping hole 17.

[0051] Specifically, several brake pads 11 are symmetrically arranged on the rear cover 1, and locking holes 17 are formed between the brake pads 11. A clamping spring 12 is fitted on each brake pad 11, and anti-disengagement parts 7 are provided at the upper and lower ends of the brake pad 11 to limit the clamping spring 12 and prevent it from disengaging. The inner diameter of the clamping spring 12 is smaller than the outer diameter of the brake pad 11. After the locking hole 17 is assembled with the shaft core 19, it will clamp the shaft core 19 for static self-locking of the motor 18.

[0052] This utility model is as follows Figure 3 and Figure 7 As shown, three brake pads 11 clamp the shaft 19 of the motor 18 to achieve a self-locking effect. The brake pads 11 and the shaft 19 have an interference fit to increase the friction during the rotation of the shaft. The brake pads 11 can be made of wear-resistant and high-temperature resistant engineering plastics such as PPS, PEEK, or Teflon, which have better high-temperature resistance and friction and wear characteristics. Since the brake pads 11 and the shaft are interference fit, the brake pads 11 will wear or plastically deform after long-term use. Therefore, a clamping spring 12 is fitted on the outside of the three brake pads 11. The clamping spring 12 has a contraction force, which makes the three brake pads 11 move closer together. Even if the brake pads 11 wear or plastically deform, the contraction force of the clamping spring 12 can still maintain friction between the brake pads 11 and the shaft 19 to achieve the self-locking effect. After the clamping spring 12 is assembled, the brake pads 11 have a clamping effect on the shaft 19.

[0053] In this invention, the brake structure is located at the rear cover 1. In other embodiments, it can also be located at the front cover.

[0054] The structure of this utility model does not increase the size of the motor 18, and has the advantages of convenient assembly, space saving and cost reduction. In addition, the self-locking achieved by increasing friction has the characteristics of good effect and reliable performance.

[0055] This utility model effectively solves the technical problems of the lack of a brake structure affecting the use effect and the increase in size and material cost of the electromagnetic brake structure in the prior art by using three brake pads 11 to clamp the shaft core 19 of the motor 18 to increase the friction. Thus, it achieves the technical effect of good self-locking effect, compact structure and low cost.

[0056] This utility model, such as Figure 3 As shown, there is a gap 20 between the three brake pads 11, and the tops of the three brake pads 11 are connected by a connecting part 21. The bottom of the gap 20 has a positioning groove 10.

[0057] Specifically, the assembly groove 8 contains grease, the brake pad 11 is immersed in the grease, and the brake pad 11 has an oil groove 9 on its inner side, which is distributed along the axial direction of the brake pad 11. In this invention, the assembly groove 8 serves as the inner cavity of the rear cover 1. After grease is injected into it, the brake pad 11 assembly is immersed in the grease. The oil groove 9 ensures that grease can penetrate between the shaft and the brake pad. The bearing 14 is a powder metallurgy oil-impregnated bearing.

[0058] In this invention, the lubricating grease, such as butter, is non-flowing. Furthermore, since the motor's speed does not exceed 100 rpm, the grease will not be splashed from the oil groove 9 onto the rotor. Consequently, the grease at the brake pad 11 will not leak, resulting in better wear resistance and more stable braking performance.

[0059] Specifically, the limiting structure 13 includes a riveting point 5 at the bottom of the rear cover 1 facing inward, and a positioning groove 10 at the bottom of the brake pad 11 that is adapted to engage with the riveting point 5. This prevents the brake pad 11 from rotating along the axial direction of the shaft core 19 within the mounting groove 8, thus keeping the brake pad 11 relatively fixed within the mounting groove 8.

[0060] In this utility model, the rear cover 1 has a pre-drilled mounting hole 6, and the bolts pass through the mounting hole 6 to install and fix the rear cover 1 and the motor brake structure inside it to the motor housing.

[0061] This utility model, such as Figure 7 As shown, one end of the shaft core 19 of the motor 18 (rotor) is inserted into the clamping hole 17 of the bearing 14 and the brake pad 11, and the other end (point b in the figure) is used to achieve external transmission through the meshing / fitting of bevel gears.

[0062] This utility model also includes a riveted bearing spring piece 15, wherein the connection between the mating part 3 and the recessed part 16 is an annular pressing groove 4, and the riveted bearing spring piece 15 is assembled in the pressing groove 4 to fit and press the bearing 14. Figure 4 and Figure 7As shown, brake pad 11 and bearing 14 are installed in the assembly groove 8. They are located on the same axis, and bearing 14 is on top of brake pad 11, thereby restricting the axial movement of brake pad 11. Then, the bearing spring 15 is assembled and clamped on the clamping groove 4. The bearing spring 15 clamps the bearing 14. The bearing spring 15 and the clamping groove 4 are interference fit.

[0063] This utility model, such as Figures 4 to 7 As shown, the rear cover 1 has a recessed portion 16, and the mating portion 3 is integrally formed with the recessed portion 16, forming a recessed groove 2 in the rear cover 1. The rear cover 1 is formed by reverse stamping inward (or into the housing of the motor 18). After reverse stamping, the protruding length of the mating portion 3 is d2 = 7.9 mm, which is shorter than the conventional outward protrusion length d4 = 13.9 mm in the prior art. Therefore, the overall housing length of the motor 18 can be d1 = 104.3 mm, which is shorter than the conventional housing length d3 = 110.3 mm in the prior art. The brake pad is installed inside the rear cover 1. The reverse stamping reduces the length of the rear cover 1 protruding outside the housing of the motor 18, so the motor 18 and its housing will not appear too long. The rear cover 1 is relatively shorter, and the appearance is relatively better. Therefore, the structure of the motor 18 and the motor brake structure can be more compact. The size of the motor 18 still needs to be further reduced to achieve the optimization goal.

[0064] The advantages of this motor brake structure are:

[0065] 1. The back cover 1 is stamped inward to form a recessed part 16. After the reverse stamping, the outward protrusion of the mating part 3 is small, which will reduce the length of the back cover 1 protruding to the outside of the motor 18 housing. In this way, the motor 18 and its housing will not appear too long, so the structure of the motor 18 and the motor brake structure can be more compact. The brake pad 11 is placed in the mounting groove 8 and the axial movement of the brake pad 11 is restricted by the bearing 14. No additional auxiliary parts are needed to fix the brake pad 11, thereby reducing auxiliary parts, reducing installation steps, and reducing manufacturing costs.

[0066] 2. The brake pads 11 and the clamping springs 12 are located inside the mounting grooves 8 of the rear cover 1. The grease in the rear cover 1 wets the brake pads 11 and the oil grooves 9, which enhances the heat dissipation effect and improves the life of the brake pads 11.

[0067] 3. Conventional brake structures are located in the middle of the motor or at the front end of the motor output shaft. Stress analysis shows that their self-locking stability is inferior to the motor brake structure of this design. The limiting structure 13 prevents the brake pad 11 from rotating along the axial direction of the shaft core 19 within the assembly groove 8, thus fixing the brake pad 11 relatively within the assembly groove 8. Furthermore, the riveted bearing spring 15 clamps the bearing 14 during assembly, resulting in a motor brake structure with good self-locking effect, stable self-locking performance, and a compact structure.

[0068] 4. Placing the grease in the closed tail cover 1 will reduce grease loss and improve the service life of the oil-impregnated bearing 14.

[0069] like Figure 6 As shown, a motor 18 includes the motor brake structure described above. The specific structure of this motor brake structure is as described in the above embodiments. Since this motor 18 adopts all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated upon here.

[0070] The parts not described herein are existing technologies.

[0071] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An electric machine brake structure, characterized by, The application relates to a motor brake structure for static self-locking of a motor (18). A rear cover (1) has a concave recess (16), A fitting part (3) is integrally formed with the recess (16) and forms a recess groove (2) of the rear cover (1) with the recess (16); The fitting part (3) has a middle part and forms an assembly groove (8); A brake pad (11) is installed in the assembly groove (8) and is fixed relative to the assembly groove (8) through a limiting structure (13); A bearing (14) is installed in the assembly groove (8) and is located above the brake pad (11); The brake pad (11) has a clamping hole (17); A shaft core (19) of the motor (18) passes through the clamping hole (17) and is rotationally fitted with the bearing (14), and the brake pad (11) clamps the shaft core (19) through the clamping hole (17).

2. A motor brake structure as claimed in claim 1, wherein A plurality of brake pads (11) are symmetrically arranged on the rear cover (1) and form the clamping hole (17) between the brake pads (11).

3. A motor brake structure as claimed in claim 1, wherein The assembly groove (8) has lubricating grease, the brake pad (11) is immersed in the lubricating grease, and the brake pad (11) has an oil groove (9) on the inner side and the oil groove (9) is distributed along the axial direction of the brake pad (11).

4. A motor brake structure as claimed in claim 1, wherein The brake pad (11) is sleeved with a clamping spring (12), and the brake pad (11) has a anti-falling part (7) for limiting the clamping spring (12) at the upper and lower ends.

5. A motor brake structure as claimed in claim 4, wherein The inner diameter of the clamping spring (12) is smaller than the outer diameter of the brake pad (11), the clamping hole (17) clamps the shaft core (19) after being assembled with the shaft core (19) and is used for static self-locking of the motor (18).

6. A motor brake structure as claimed in claim 1, wherein The limiting structure (13) comprises a rivet limiting point (5) on the bottom of the rear cover (1) and a limiting groove (10) on the bottom of the brake pad (11) and adapted to be clamped with the rivet limiting point (5).

7. A motor brake structure as claimed in claim 1, wherein The rear cover (1) has a reserved mounting hole (6).

8. A motor brake structure as claimed in claim 1, wherein The brake pad (11) is made of high-temperature-resistant material.

9. A motor brake structure as claimed in claim 1, wherein The application further comprises a riveted bearing spring (15), the connecting part between the fitting part (3) and the recess (16) is an annular pressing groove (4), the riveted bearing spring (15) is assembled in the pressing groove (4) and sleeves and presses the bearing (14).

10. An electric machine (18) characterized by The motor (18) comprises the motor brake structure according to any one of claims 1 to 9.

Images