An ultra-thin non-excitation brake with a release structure

Abstract

This invention relates to the field of brake technology, specifically disclosing an ultra-thin non-excitation brake with a release structure, comprising: a follower disc, a housing, a first end cap, and a second end cap. The follower disc rotates synchronously with the output shaft of a motor. The housing and the first end cap are respectively fastened to both ends of the housing. Multiple support rods are threaded through the second end cap via fasteners. The brake disc is slidably mounted on the multiple support rods along the axial direction. A ring seat is located at the end of the second end cap near the follower disc, on the side of the brake disc away from the follower disc. A magnetic attraction structure is disposed between the brake disc and the ring seat. An elastic support assembly is disposed between the second end cap and the brake disc for elastically supporting the brake disc. This invention achieves slow brake release, avoiding the impact and noise caused by the instantaneous release of traditional brakes. While ensuring braking effect, it also achieves miniaturization of the overall brake structure, effectively reducing manufacturing costs.

Description

Technical Field

[0001] This invention relates to the field of brake technology, and more specifically to an ultra-thin non-excitation brake with a release structure. Background Technology

[0002] Non-excitation brakes are widely used in industrial transmission systems such as servo motors, industrial robots, CNC machine tools, and lifting machinery. They are used to achieve rapid braking when power is off to ensure equipment safety, and to release the brake when power is restored, allowing the equipment to operate normally. Traditional non-excitation brakes typically employ a single-stage friction braking structure, where a compression spring pushes an armature to drive brake pads to press against the brake disc, generating braking torque. When energized, electromagnetic force overcomes the spring force, causing the brake pads to separate from the brake disc.

[0003] Patent (CN1277064C) discloses an electromagnetic brake comprising: a fixed iron core; a movable iron core; and a winding for moving the movable iron core. The electromagnetic brake performs braking by being linked to the movement of the movable iron core. The fixed iron core and the movable iron core have: opposing surfaces that are opposite each other and whose distance between them changes due to the movement of the movable iron core; and sliding surfaces that are opposite each other in other parts besides the opposing surfaces and slide against each other due to the movement of the movable iron core. Each sliding surface has at least one recess. When the distance between the opposing surfaces is at its minimum, at least one set of the recesses in the fixed iron core and the recesses in the movable iron core are arranged in mutually opposing and matching positions. The width of the recess is greater than the difference between the distance when the distance between the opposing surfaces is at its maximum and the distance when the distance between the opposing surfaces is at its minimum.

[0004] However, the aforementioned technologies have some drawbacks, such as: 1. Large impact upon energization and release, affecting equipment stability: When a traditional non-excitation brake is energized and released, the brake pads instantly detach completely from the brake disc, generating a significant mechanical impact and noise. For equipment requiring high operational stability, such as servo motors and precision turntables, this impact can affect the equipment's operational accuracy and service life.

[0005] 2. Existing slow-release solutions are costly and have low reliability: To achieve smooth release, some high-end brakes use a controller to perform closed-loop current regulation of the electromagnet, gradually reducing the electromagnetic force to slow down the release speed of the brake pads. However, this solution requires additional configuration of a programmable controller, current sensor, and complex drive circuitry, which not only significantly increases system cost and debugging difficulty, but also makes it susceptible to electromagnetic interference in harsh industrial environments, posing a risk of control failure and making reliability difficult to guarantee.

[0006] 3. The brake is too large to meet the miniaturization requirements: In traditional non-excitation brakes, the yoke assembly is usually fixed and the armature needs to move a large distance independently to complete the release. This results in a large deformation of the compression spring and a high requirement for the maximum magnetic force output of the yoke assembly. To meet the magnetic force requirements, the size of the yoke assembly and the armature needs to be increased accordingly, making it difficult to compress the overall size of the brake and limiting its application in compact spaces. Summary of the Invention

[0007] To address the aforementioned problems in the prior art, the present invention provides an ultra-thin non-excitation brake with a release structure, which can solve the problems mentioned in the background art.

[0008] The objective of this invention can be achieved through the following technical solutions: An ultrathin non-excitation brake with a release structure includes: The components include a follower disk, a tube shell, a first end cap, and a second end cap. The follower disk rotates synchronously with the motor output shaft, and the tube shell and the first end cap are respectively fastened to both ends of the tube shell. The second end cover is provided with multiple support rods through fasteners. The multiple support rods slide together along the axial direction to provide a brake disc. The end of the second end cover near the follower disc is provided with a ring seat. The ring seat is located on the side of the brake disc away from the follower disc and is coaxial with the brake disc. A magnetic attraction structure is installed between the brake disc and the ring seat; An elastic support assembly is disposed between the second end cover and the brake disc to elastically support the brake disc; The transmission mechanism is disposed between the ring seat, the magnetic attraction structure and the elastic support assembly, and is configured to drive the elastic support assembly to move in the opposite direction in response to the axial movement of the magnetic attraction structure. A limiting structure is installed between the brake disc and the ring seat to improve the stability of the brake disc during axial sliding.

[0009] Preferably, the follower disk is coaxial with the tube shell, and one end is rotatably fitted with the first end cover, and the wall surface of the first end cover that is fitted with the tube shell is provided with a wear-resistant coating.

[0010] Preferably, the end of the second end cap away from the follower disk is provided with a plurality of heat dissipation holes arranged in a circumferential array, and a filter screen is provided inside the heat dissipation holes.

[0011] Preferably, the magnetic attraction structure includes an armature disposed at the end of the brake disc away from the follower disc, and a magnetic yoke assembly is slidably sleeved on the outer circumferential wall of the ring seat along the axial direction, the magnetic yoke assembly being matched with the armature.

[0012] Preferably, the elastic support assembly includes a ring plate slidably disposed on the inner wall of the ring seat, a plurality of first compression springs are disposed between the ring plate and the second end cap, and a plurality of second compression springs are disposed between the ring plate and the brake disc, wherein the first compression springs are coaxially disposed with the support rod, and the second compression springs are coaxially disposed with the ring plate.

[0013] Preferably, the transmission mechanism includes a limiting block that penetrates radially and is slidably disposed on the circumferential sidewall of the ring seat. Multiple limiting blocks are arranged in a circumferential array along the circumference of the ring seat. The limiting block has an isosceles trapezoidal cross-section. Multiple limiting grooves are provided on the outer wall of the ring plate. The limiting grooves match the limiting blocks. A retaining ring is provided at the end of the magnetic yoke assembly away from the armature, which is slidably fitted with the inclined surface of the limiting block.

[0014] Preferably, the inner wall of the retaining ring is provided with a groove, and the limiting block matches the groove of the retaining ring.

[0015] Preferably, the axial distance from the vertical section of the inner wall of the retaining ring to the magnetic yoke assembly is equal to the length of the limiting groove along the axial direction of the ring plate.

[0016] Preferably, the limiting structure includes a limiting ring, which is fixedly sleeved on the inner wall of the ring seat, and a plurality of limiting rods are provided at the end of the brake disc away from the follower disc, wherein the limiting rods are through and slidably connected to the limiting ring.

[0017] The beneficial effects of this invention are as follows: 1. By setting a transmission mechanism consisting of a limiting block, a limiting groove and a retaining ring, the limiting block is set with an isosceles trapezoidal cross section, and the inclined surface of the retaining ring slides and fits with the inclined surface of the limiting block. When the magnetic yoke assembly is energized and moves, it drives the retaining ring to push the limiting block to move radially inward. After the groove on the inner wall of the retaining ring cooperates with the limiting block, it continues to drive the ring plate to move, so that the first compression spring and the second compression spring are compressed in sequence, and the brake disc and the follower disc slowly separate. The resulting technical effect is that it enables the slow release of the brake, avoiding the impact and noise caused by the instantaneous release of the traditional brake, making the brake release process smoother and gentler, and is particularly suitable for precision transmission equipment with high requirements for operational stability.

[0018] 2. By setting the axial distance from the vertical section of the inner wall of the retaining ring to the magnetic yoke assembly to be equal to the axial length of the limiting groove along the ring plate, and the length difference between the limiting groove and the limiting block along the ring seat axis is d1, the magnetic yoke assembly moves a distance of d1 when the brake is released, the armature moves a distance of d2 with the magnetic yoke assembly, one end of the second compression spring moves with the ring plate in the elongation direction, and the other end moves with the armature in the compression direction, with the two ends moving towards each other, so that the actual compression amount of the second compression spring is less than the compression amount when the conventional brake is driven by one end; The resulting technical effects are: reducing the deformation of the second compression spring, lowering the requirement for the maximum magnetic force output of the yoke assembly, thereby simplifying the configuration requirements of the yoke assembly and armature, achieving miniaturization of the overall brake structure while ensuring braking effect, and effectively reducing processing costs.

[0019] 3. By setting a limiting structure consisting of a limiting ring and a limiting rod, the limiting ring is fixedly sleeved on the inner wall of the ring seat, and the limiting rod is set at the end of the brake disc away from the follower disc. The limiting rod and the limiting ring are connected through and slidingly, so as to guide and limit the axial sliding of the brake disc. The resulting technical effects are: improved stability of the brake disc during axial sliding, prevention of brake disc from skewing or jamming during movement, and ensure of parallel fit accuracy between the brake disc and the follower disc, thereby guaranteeing the stability of the braking torque and the long-term reliable operation of the brake. Attached Figure Description

[0020] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a cross-sectional view of the present invention; Figure 3 This is a diagram showing the installation structure of the follower disk in this invention; Figure 4 This is an exploded view of the invention; Figure 5 This is a diagram showing the mounting structure of the brake disc and armature in this invention; Figure 6 This is a diagram showing the installation structure of the ring plate and the limiting block in this invention; Figure 7 This is a cross-sectional perspective view of the ring seat, retaining ring, and magnetic yoke assembly in this invention. Figure 8 This is a diagram showing the installation structure of the retaining ring in this invention; Figure 9 This is a cross-sectional view of the ring seat and armature in this invention.

[0022] Explanation of reference numerals in the attached figures: 1. Follower disc; 2. Tube shell; 3. First end cap; 4. Second end cap; 5. Filter screen; 11. Support rod; 12. Brake disc; 13. Ring seat; 21. Armature; 22. Magnetic yoke assembly; 31. Ring plate; 32. First compression spring; 33. Second compression spring; 41. Limiting block; 42. Limiting groove; 43. Retaining ring; 51. Limiting ring; 52. Limiting rod. Detailed Implementation

[0023] To further illustrate the technical means and effects adopted by the present invention to achieve its intended purpose, the specific implementation methods, structures, features, and effects of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and preferred embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] In the description of this application, it should be understood that the orientation or positional relationship indicated by terms such as "inner" and "outer" are based on the orientation or position shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or a specific orientational structure and operation, and therefore should not be construed as a limitation of this application.

[0025] Example 1: Reference Figures 1-9 The present invention discloses an ultrathin non-excitation brake with a release structure, comprising: To support the brake housing, in this embodiment: follower disk 1, tube housing 2, first end cover 3 and second end cover 4. Follower disk 1 rotates synchronously with the motor output shaft. Tube housing 2 and first end cover 3 are respectively set at both ends of tube housing 2 by fasteners. Follower disk 1 is coaxial with tube housing 2, and one end is rotatably fitted with first end cover 3. The wall surface of first end cover 3 that is in contact with tube housing 2 is provided with a wear-resistant coating. The end of second end cover 4 away from follower disk 1 is provided with a plurality of heat dissipation holes arranged in a circumferential array. A filter screen 5 is provided in the heat dissipation holes.

[0026] In order to achieve braking, in this embodiment: the second end cover 4 is provided with multiple support rods 11 through fasteners, and the multiple support rods 11 are slidably arranged together along the axial direction to provide a brake disc 12. The end of the second end cover 4 near the follower disc 1 is provided with a ring seat 13, which is located on the side of the brake disc 12 away from the follower disc 1 and is coaxially arranged with the brake disc 12.

[0027] In order to achieve magnetic drive and magnetic attraction of brake disc 12, in this embodiment: a magnetic attraction structure is set between brake disc 12 and ring seat 13. The magnetic attraction structure includes an armature 21, which is set at the end of brake disc 12 away from follower disc 1. A magnetic yoke assembly 22 is slidably sleeved on the outer circumferential wall of ring seat 13 along the axial direction. The magnetic yoke assembly 22 matches the armature 21.

[0028] In order to achieve the support and reset of the brake disc 12, in this embodiment: an elastic support assembly is disposed between the second end cover 4 and the brake disc 12 to elastically support the brake disc 12. The elastic support assembly includes an annular plate 31, which is slidably disposed on the inner wall of the annular seat 13. A plurality of first compression springs 32 are disposed between the annular plate 31 and the second end cover 4, and a plurality of second compression springs 33 are disposed between the annular plate 31 and the brake disc 12. The first compression springs 32 are coaxially disposed with the support rod 11, and the second compression springs 33 are coaxially disposed with the annular plate 31.

[0029] To achieve reverse linkage between the movement of the magnetic attraction structure and the elastic support component, in this embodiment: a transmission mechanism is disposed between the ring seat 13, the magnetic attraction structure, and the elastic support component, and is configured to: respond to the axial movement of the magnetic attraction structure, drive the elastic support component to move in the opposite direction. The transmission mechanism includes a limiting block 41, which is radially penetrating and slidably disposed on the circumferential side wall of the ring seat 13. Multiple limiting blocks 41 are distributed in a circumferential array along the circumference of the ring seat 13. The cross-section of the limiting block 41 is an isosceles trapezoid. Multiple limiting grooves 42 are provided on the outer wall of the ring seat 13. The limiting grooves 42 match the limiting blocks 41. A retaining ring 43 is provided at the end of the magnetic yoke component 22 away from the armature 21. It is slidably fitted with the inclined surface of the limiting block 41. A groove is provided on the inner wall of the retaining ring 43. The limiting block 41 matches the groove of the retaining ring 43.

[0030] To improve the stability of the brake disc 12 sliding, in this embodiment: a limiting structure is provided between the brake disc 12 and the ring seat 13 to improve the stability of the brake disc 12 sliding along the axial direction. The limiting structure includes a limiting ring 51, which is fixedly sleeved on the inner wall of the ring seat 13. A plurality of limiting rods 52 are provided at the end of the brake disc 12 away from the follower disc 1. The limiting rods 52 and the limiting ring 51 are connected through and slidably.

[0031] In this embodiment, the axial distance from the vertical section of the inner wall of the retaining ring 43 to the magnetic yoke assembly 22 is equal to the length of the limiting groove 42 along the axial direction of the ring seat 13. The length difference between the limiting groove 42 and the limiting block 41 along the axial direction of the ring plate 31 is denoted as d1. When the demagnetized brake transitions from the braking state to the release state, the magnetic yoke assembly 22 moves axially by a distance of d1, and the armature 21 moves axially by a distance of d2 along with the magnetic yoke assembly 22. In a conventional demagnetized brake, the magnetic yoke assembly 22 is fixed, and the armature 12 must move independently by a distance equal to the sum of d1 and d2 to complete the release. Therefore, in this solution, the actual moving distance d2 of the armature 21 is significantly smaller than the total moving distance in the conventional solution, which reduces the deformation of the second compression spring 33 and thus reduces the requirement for the maximum magnetic force output of the magnetic yoke assembly 22. This not only simplifies the configuration requirements of the magnetic yoke assembly 22 and the armature 21, but also enables the miniaturization of the overall brake structure while ensuring the braking effect, effectively reducing the processing cost of the electromagnetic brake.

[0032] The working principle and usage process of this invention are as follows: In the braking state, the magnetic yoke assembly 22 is de-energized, the first compression spring 32 pushes the ring plate 31, and the ring plate 31 pushes the brake disc 12 to move towards the follower disc 1 through the second compression spring 33. The braking surface of the brake disc 12 presses against the follower disc 1, and at the same time, the armature 21 moves with the brake disc 12 and remains separated from the magnetic yoke assembly 22 to achieve braking lock.

[0033] When the brake needs to be released, the yoke assembly 22 is energized to generate electromagnetic force, attracting the armature 21 to move towards the yoke assembly 22. The armature 21 drives the brake disc 12 to move away from the follower disc 1, overcoming the elastic force of the second compression spring 33, thus disengaging the brake disc 12 from the follower disc 1 and releasing the brake. During this process, the yoke assembly 22 simultaneously slides along the axial direction of the ring seat 13, driving the retaining ring 43 to move. The inclined surface of the retaining ring 43 slides against the inclined surface of the limiting block 41, pushing the limiting block 41 to move radially inward. When the limiting block 41 is in place, the groove on the inner wall of the retaining ring 43 engages with the limiting block 41. As the yoke assembly 22 continues to move, the limiting block 41 drives the retaining ring 43 and the yoke assembly 22 to continue sliding axially through the groove, thereby driving the ring plate 31 to move towards the second end cover 4, overcoming the elastic force of the first compression spring 32, further compressing the first compression spring 32.

[0034] Meanwhile, one end of the second compression spring 33 is fixedly connected to the ring plate 31 and moves towards the second end cover 4 with the ring plate 31; the other end of the second compression spring 33 is fixedly connected to the armature 21 and the brake disc 12 and moves towards the magnetic yoke assembly 22 with the armature 21. Therefore, the two ends of the second compression spring 33 move in opposite directions, one end moves in the elongation direction and the other end moves in the compression direction, and the overall behavior is compression. However, since the two ends move towards each other at the same time, the actual compression amount of the second compression spring 33 is less than the compression amount when driving at one end in a conventional brake, thereby reducing the deformation of the second compression spring 33 and reducing the demand for the maximum magnetic force output of the magnetic yoke assembly 22. When the magnetic yoke assembly 22 moves to the limit position, the second compression spring 33 is compressed to a stable state, and the brake completes its final release.

[0035] During the operation of the brake, the follower disc 1 rotates synchronously with the output shaft of the motor, causing the surrounding air to flow. The external cold air enters the brake after being filtered by the filter screen 5 on the second end cover 4. It flows through the surface of each component, carrying the heat generated by the braking friction and being discharged from the heat dissipation holes, forming a wind-cooled circulation, which removes the heat in time and prevents the brake pads from wearing at high temperature.

[0036] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. An ultra-thin non-excitation brake with a release structure, characterized in that, include: The components include a follower disk, a tube shell, a first end cap, and a second end cap. The follower disk rotates synchronously with the motor output shaft, and the tube shell and the first end cap are respectively fastened to both ends of the tube shell. The second end cover is provided with multiple support rods through fasteners. The multiple support rods slide together along the axial direction to provide a brake disc. The end of the second end cover near the follower disc is provided with a ring seat. The ring seat is located on the side of the brake disc away from the follower disc and is coaxial with the brake disc. A magnetic attraction structure is installed between the brake disc and the ring seat; A flexible support assembly is disposed between the second end cap and the brake disc; The transmission mechanism is disposed between the ring seat, the magnetic attraction structure and the elastic support assembly, and is configured to drive the elastic support assembly to move in the opposite direction in response to the axial movement of the magnetic attraction structure. The limiting structure is located between the brake disc and the ring seat.

2. The ultra-thin non-excitation brake with a release structure according to claim 1, characterized in that, The follower disk is coaxial with the tube shell, and one end is rotatably fitted with the first end cover. The surface of the first end cover that is in contact with the tube shell is provided with a wear-resistant coating.

3. The ultra-thin non-excitation brake with a release structure according to claim 1, characterized in that, The second end cap, at the end furthest from the follower disk, is provided with a plurality of heat dissipation holes arranged in a circumferential array, and a filter screen is provided inside the heat dissipation holes.

4. The ultra-thin non-excitation brake with a release structure according to claim 1, characterized in that, The magnetic attraction structure includes an armature, which is located at the end of the brake disc away from the follower disc. A magnetic yoke assembly is slidably sleeved on the outer circumferential wall of the ring seat along the axial direction. The magnetic yoke assembly matches the armature.

5. An ultra-thin non-excitation brake with a release structure according to claim 4, characterized in that, The elastic support assembly includes a ring plate slidably disposed on the inner wall of the ring seat. A plurality of first compression springs are disposed between the ring plate and the second end cap, and a plurality of second compression springs are disposed between the ring plate and the brake disc. The first compression springs are coaxially disposed with the support rod, and the second compression springs are coaxially disposed with the ring plate.

6. An ultra-thin non-excitation brake with a release structure according to claim 5, characterized in that, The transmission mechanism includes a limiting block that penetrates radially and is slidably disposed on the circumferential side wall of the ring seat. Multiple limiting blocks are arranged in a circumferential array along the circumference of the ring seat. The cross-section of the limiting block is an isosceles trapezoid. Multiple limiting grooves are provided on the outer wall of the ring plate. The limiting grooves match the limiting blocks. A retaining ring is provided at the end of the magnetic yoke assembly away from the armature, which is slidably fitted with the inclined surface of the limiting block.

7. An ultra-thin non-excitation brake with a release structure according to claim 6, characterized in that, The inner wall of the retaining ring is provided with a groove, and the limiting block matches the groove of the retaining ring.

8. An ultra-thin non-excitation brake with a release structure according to claim 6, characterized in that, The axial distance from the vertical section of the inner wall of the retaining ring to the magnetic yoke assembly is equal to the length of the limiting groove along the axial direction of the ring plate.

9. An ultra-thin non-excitation brake with a release structure according to claim 1, characterized in that, The limiting structure includes a limiting ring, which is fixedly sleeved on the inner wall of the ring seat. The brake disc is provided with multiple limiting rods at the end away from the follower disc. The limiting rods are connected to the limiting ring through and in a sliding manner.

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