Brake with manual release structure

Abstract

The utility model provides a brake with a manual release structure, and belongs to the technical field of brakes, the brake with the manual release structure comprises a shell, an armature, a friction disc and a tail plate, the armature, the friction disc and the tail plate are sequentially arranged at one shaft end of the shell in the axial direction, and the shell is provided with an electromagnetic coil and a first spring which are arranged towards the armature; the brake further comprises a releasing assembly used for manually releasing the friction disc, the releasing assembly comprises a handle, a releasing column, a ball and a second spring, the handle is used for driving the releasing column to extrude the first spring in the axial direction, and the second spring acts on the releasing column. The handle is directly or indirectly close to the ball; the release column penetrates through the shell along the axis of the shell and is provided with a first step, a third step and a containing groove, the first step abuts against the armature under the action of the first spring, and the containing groove is used for containing the second spring.

Description

Technical Field

[0001] The utility model belongs to the technical field of brakes, and in particular relates to a brake with a manual release structure. Background Art

[0002] The working principle of the brake is that the electromagnetic coil is powered off for braking and powered on for releasing the brake. In order to ensure that the brake can switch its state even in an emergency (power off or failure), a manual release structure is usually set on the brake, which can switch the brake to a non-braking state without energizing the brake.

[0003] The current manual release structures are all release handles. Long-term manual release work will cause direct wear between the operating handle and the steel ball, or the friction plate will become thinner after long-term wear. Therefore, a certain gap will be left between the operating handle and the steel ball in the early stage to prevent the friction plate from being worn too much in the later stage of work. The gap between the armature and the shell will become larger, and the steel ball will be pressed against the groove of the handle, thereby reducing the force applied to the armature, which may cause the armature to be unable to contact the friction disk and the brake to fail. However, when there is a gap between the operating handle and the steel ball, the handle cannot be lifted up by the steel ball when it is rotated to a certain angle, that is, there is a virtual position, and the handle will be loose. When the brake is in working state, there will be vibration and noise, which will reduce the user experience. In addition, when the brake is large in size, the manual release force is too large, which makes it inconvenient for the user to turn the handle. Utility Model Content

[0004] The embodiment of the utility model provides a brake with a manual release structure, aiming to solve the technical problems that the existing brake is large in size, the manual release force is too large, there is a virtual position when braking due to direct wear between the operating handle and the steel ball, or the thickness of the friction plate is reduced due to wear, there is a lot of noise during operation, and the user experience is reduced.

[0005] To achieve the above object, the technical solution adopted by the utility model is: to provide a brake with a manual release structure, comprising a housing, and an armature, a friction disc, and a tail plate sequentially arranged at one axial end of the housing along the axial direction, the housing having an electromagnetic coil and a first spring arranged toward the armature;

[0006] The brake further comprises a release assembly for manually releasing the friction disc, the release assembly comprising a handle, a release column, a ball and a second spring, the handle is used to drive the release column to compress the first spring in the axial direction, the ball is located between the handle and the housing, the second spring acts on the release column and directly or indirectly makes the handle close to the ball;

[0007] The release column passes through the shell along the axis of the shell, and has a first step, a third step and a receiving groove. The outer diameter of the first step is larger than the outer diameter of the third step, and the first step and the third step are distributed in sequence in the direction away from the armature. The shell has a first mounting groove adapted to the first step and the third step; the first step abuts against the armature under the action of the first spring, the third step at least partially overlaps with the projection of the ball in the axial direction, and the receiving groove is an installation space formed by a depression in the axial direction, which is used to place the second spring.

[0008] In one possible implementation, the release column includes a first center column and a release plate, the first center column has a second step, the release plate is sleeved on the outer periphery of the first center column and has a second mounting groove adapted to the second step, the handle is fixedly connected to the first center column by fasteners, and the first step and the third step are both arranged on the release plate.

[0009] In a possible implementation, three fasteners are provided and are evenly distributed around the axis of the brake.

[0010] In a possible implementation, the accommodating groove is located at the bottom surface of the second mounting groove, and in the axial direction, the height of the second spring is greater than the depth of the accommodating groove, and the second spring is located between the third step and the second step.

[0011] In a possible implementation, the release assembly further includes a gasket disposed between the second step and the second spring, and two ends of the second spring in the axial direction respectively abut against the gasket and a bottom surface of the accommodating groove.

[0012] In a possible implementation manner, a lubricating coating is provided on one end surface of the gasket facing the second step, or on both end surfaces thereof.

[0013] In a possible implementation, the release column includes a second center column and a pressure cover, the pressure cover is located at the end of the handle away from the housing, the second center column passes through the handle and is connected to the pressure cover, and the first step and the third step are both arranged on the second center column.

[0014] In a possible implementation, the accommodating groove is located on the side of the pressure cover facing the handle, and in the axial direction, the height of the second spring is greater than the depth of the accommodating groove, and the two ends of the second spring in the axial direction respectively abut against the handle and the bottom surface of the accommodating groove.

[0015] In one possible implementation, the ball is always located in the ball groove of the shell, and a groove is provided on one end surface of the handle facing the ball. The ball has a first state in which it is located in the groove, and a second state in which the ball is located outside the groove after the handle is rotated.

[0016] In a possible implementation, a dust cover is further included, wherein one axial end side wall of the dust cover is connected to the outer peripheral surface of the shell, and the other axial end side wall of the dust cover is connected to the tail plate.

[0017] Compared with the prior art, the embodiment of the present application has the following features: the first step coincides with the area where the first spring is located in the axial direction, and the third step at least partially overlaps with the axial projection of the ball. This structure is compact and can reduce the overall volume of the brake. While ensuring the structural strength of the release column, the ball is closer to the rotation axis of the handle, thereby reducing the manual release force. The second spring in the release assembly acts on the release column. During operation, the second spring can form a buffer in the axial direction. When the handle and the ball are directly worn or the friction disk becomes thinner due to wear, the second spring can compensate for the wear thickness, that is, reduce the virtual position, thereby ensuring the braking effect of the handle and reducing noise during use. The second spring is placed in the accommodating groove to limit the minimum working height of the second spring, so that the second spring will not be flattened, thereby extending the service life of the second spring and thus extending the service life of the release assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the front view of a brake with a manual release structure provided in Embodiment 1 of the utility model;

[0019] Figure 2 For along Figure 1 Schematic diagram of the cross-sectional structure along the AA line;

[0020] Figure 3 A schematic diagram of the front view of a brake with a manual release structure provided in the second embodiment of the utility model;

[0021] Figure 4 For along Figure 3 Schematic diagram of the cross-sectional structure along line BB.

[0022] Description of reference numerals:

[0023] 10-housing; 11-electromagnetic coil; 12-first spring; 13-first mounting groove; 14-ball; 15-limiting pin;

[0024] 20-armature;

[0025] 30-friction disc;

[0026] 40-tail board;

[0027] 50-release assembly; 501-handle; 502-first center column; 503-second step; 504-release plate; 505-second mounting slot; 506-second center column; 507-pressure cover; 508-third step; 51-second spring; 52-first step; 53-accommodating groove; 54-gasket; 55-groove;

[0028] 60-Dust cover. DETAILED DESCRIPTION

[0029] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0030] Please also read Figures 1 to 4 The brake with manual release structure provided by the utility model is now described. The brake with manual release structure comprises a housing 10, and an armature 20, a friction disc 30, and a tail plate 40 which are sequentially arranged at one end of the housing 10 along the axial direction. The housing 10 has an electromagnetic coil 11 and a first spring 12 arranged toward the armature 20. The brake also comprises a release assembly 50 for manually releasing the friction disc 30. The release assembly 50 comprises a handle 501, a release column, a ball 14, and a second spring 51. The handle 501 is used to drive the release column to axially squeeze the first spring 12. The ball 14 is located between the handle 501 and the housing 10. The second spring 51 acts on the release column and directly or indirectly tightens the handle 501. The release column passes through the housing 10 along the axis of the housing 10, and has a first step 52, a third step 508 and a receiving groove 53. The outer diameter of the first step 52 is greater than the outer diameter of the third step 508, and the first step 52 and the third step 508 are distributed in sequence in the direction away from the armature 20. The housing 10 has a first mounting groove 13 adapted to the first step 52 and the third step 508. The first step 52 abuts against the armature 20 under the action of the first spring 12, and the third step 508 at least partially overlaps with the axial projection of the ball 14. The receiving groove 53 is an installation space formed by an axial depression, which is used to place the second spring 51.

[0031] Optionally, the second spring 51 may be a butterfly spring or a wave spring.

[0032] Compared with the prior art, the brake with a manual release structure provided in this embodiment is that when the brake is working normally, the friction disc 30 is connected to the transmission shaft on the motor through the shaft sleeve and rotates with the transmission shaft. At this time, the electromagnetic coil 11 is energized, the armature 20 is attracted to the housing 10, the armature 20 is away from the friction disc 30, and abuts the first step 52, and the first step 52 abuts the first spring 12. When the power is off, the first spring 12 rebounds and pushes the first step 52 to abut the armature 20, and the armature 20 abuts against the friction disc 30. Due to the friction resistance, the friction disc 30 stops rotating, completing the braking process. The utility model has a brake with a manual release structure, wherein the first step 52 and the area where the first spring 12 is located are axially overlapped, and the third step 508 and the projection of the ball 14 in the axial direction at least partially overlap. The structure is relatively compact, and the overall volume of the brake can be reduced. Under the condition of ensuring the structural strength of the release column, the ball 14 is closer to the rotation axis of the handle 501, thereby reducing the manual release force; the second spring 51 in the release component 50 acts on the release column, and the second spring 51 can form a buffer in the axial direction during operation, and when the handle 501 and the ball 14 are directly worn or the friction disk 30 becomes thinner due to wear, the second spring 51 can compensate for the worn thickness, so that the handle 501 is close to the ball 14, that is, the virtual position is reduced, thereby ensuring the braking effect of the handle and reducing the noise during use; the second spring 51 is placed in the accommodating groove 53, and the minimum working height of the second spring 51 is limited, so that the second spring 51 will not be flattened, thereby extending the service life of the second spring 51, thereby extending the service life of the release component 50.

[0033] In some embodiments, a specific implementation of the release assembly 50 may be as follows: Figure 1 to Figure 2 See the structure shown. Figure 1 to Figure 2 The release assembly 50 includes a first central column 502 and a release plate 504. The first central column 502 has a second step 503. The release plate 504 is sleeved on the outer periphery of the first central column 502 and has a second mounting groove 505 adapted to the second step 503. The handle 501 is fixedly connected to the first central column 502 by a fastener. The first step 52 and the third step 508 are both provided on the release plate 504. In this embodiment, the accommodating groove 53 is located at the bottom surface of the second mounting groove 505. In the axial direction, the height of the second spring 51 is greater than the depth of the accommodating groove 53. The second spring 51 is located between the third step 508 and the second step 503.

[0034] When the release assembly in this embodiment is not started and the electromagnetic coil 11 is powered off, the first spring 12 is close to the first step 52. Under the elastic force of the first spring 12, the first step 52 abuts against the armature 20, so that the armature 20 squeezes the friction disk 30. At this time, the brake is in a braking state; when the handle 501 is turned, the handle 501 is lifted up by the ball 14, and the handle 501 drives the first center column 502 away from the armature 20. The first center column 502 squeezes the second spring 51 and drives the release disk 504 to move. The first step 52 squeezes the first spring 12. At this time, the armature 20 is released and the friction disk 30 can rotate freely.

[0035] It should be noted that the handle 501 and the first center column 502 can be connected by fasteners, clamping or welding, and the fasteners can be screws, bolts, rivets, etc. For example, when screws are used for connection, see Figure 1 The fasteners are provided with three and are evenly distributed around the axis of the brake. This structure can ensure the connection stability between the handle 501 and the first center column 502.

[0036] In some embodiments, an improved embodiment of the release assembly 50 can be implemented as follows: Figure 2 See the structure shown. Figure 2 The release assembly 50 further includes a gasket 54 disposed between the second step 503 and the second spring 51. The two ends of the second spring 51 in the axial direction abut against the gasket 54 and the bottom surface of the groove of the receiving groove 53, respectively. In some embodiments, an improved implementation of the gasket 54 can adopt the following structure. Not shown in the figure, a lubricating coating is provided on one end surface of the gasket 54 facing the second step 503, or a lubricating coating is provided on both end surfaces. The lubricating coating can be a powder metallurgy lubricating coating, a Teflon coating, a molybdenum disulfide coating, a graphite coating, a polyetheretherketone coating, etc. The first center column 502 is the main rotating part. By providing the lubricating coating, the friction between the first center column 502 and the gasket 54, and between the pad 54 and the release disk 504 can be weakened, so that the release force of the brake is reduced, and the first center column 502 is not easy to wear after long-term use, thereby extending the service life of the first center column 502.

[0037] Specifically, the number of gaskets 54 can be one or more. When there are multiple gaskets 54, only one gasket close to the second step 503 among the multiple gaskets 54 may be provided with a lubricating coating, while the others may not be provided with a lubricating coating. Alternatively, both end surfaces of each gasket 54 may be provided with a lubricating coating, or both end surfaces of the second step 503 may be provided with a lubricating coating.

[0038] In some embodiments, a modified embodiment of the release assembly 50 may be as follows: Figure 3 to Figure 4 See the structure shown. Figure 3 to Figure 4The release assembly 50 includes a second central column 506 and a pressure cover 507. The pressure cover 507 is located at the end of the handle 501 away from the housing 10. The second central column 506 passes through the handle 501 and is connected to the pressure cover 507. The first step 52 and the third step 508 are both provided on the second central column 506. In this embodiment, the receiving groove 53 is located on the side of the pressure cover 507 facing the handle 501. In the axial direction, the height of the second spring 51 is greater than the depth of the receiving groove 53. The two ends of the second spring 51 in the axial direction are respectively in contact with the handle 501 and the bottom surface of the receiving groove 53.

[0039] When the release assembly in this embodiment is not activated and the electromagnetic coil 11 is powered off, the first spring 12 is close to the first step 52. Under the elastic force of the first spring 12, the first step 52 abuts against the armature 20, so that the armature 20 squeezes the friction disc 30. At this time, the brake is in a braking state; when the handle 501 is turned, the handle 501 is lifted up by the ball 14, and the handle 501 lifts the pressure cover 507. The pressure cover 507 drives the second center column 506 away from the armature 20. At this time, the armature 20 is released and the friction disc 30 can rotate freely. The second spring 51 is arranged between the pressure cover 507 and the handle 501, so that the handle 501 is close to the ball 14 to reduce the virtual position.

[0040] It should be noted that the second center column 506 and the pressure cover 507 can be connected by fasteners, clamping or welding, etc. The fasteners can be screws, bolts, rivets, etc., and there can be one or more fasteners.

[0041] In some embodiments, an improved implementation of the handle 501 can be as follows: Figure 4 See the structure shown. Figure 4 The tail end of the handle 501 is bent toward the armature 20. The tail end of the handle 501 is the end of the handle 501 extending out of the outer ring of the housing 10 and away from the housing 10. The handle 501 is bent so that its tail end is close to the motor mounting flange surface, which is convenient for installing an outer cover in special circumstances.

[0042] In some embodiments, an improved implementation of the handle 501 can be as follows: Figure 2 and Figure 4 See the structure shown. Figure 2 and Figure 4 The ball 14 is always located in the ball groove of the housing 10, a groove 55 is provided on a section of the handle 501 facing the ball 14, the ball 14 has a first state in which it is located in the groove 55, and a second state in which the ball 14 is located outside the groove 55 after the handle 501 is rotated.

[0043] See also Figure 2In the present embodiment, when the ball 14 is provided, the handle 501 needs to be rotated when the armature 20 needs to be released. The handle 501 rotates, and the ball 14 rotates out from the groove 55 on the handle 501, and the ball 14 abuts against the end face of the handle 501. At this time, the distance between the handle 501 and the housing 10 increases, driving the first center column 502 and the release plate 504 away from the armature 20, thereby releasing the armature 20.

[0044] It should be noted that in the present embodiment, when the brake vibrates slightly, the handle 501 will be caused to rotate slightly. When the ball 14 has not rotated out of the groove 55 of the handle 501, the ball 14 will exert a force on the surface of the groove 55. At the same time, the ball 14 will be subjected to a reaction force perpendicular to the contact surface of the groove 55. When the second spring 51 is compressed, an axial force is generated on the release column. The release column then acts on the handle 501, which will drive the handle 501 to rotate until the ball 14 is completely tangent to the groove 55. Therefore, the handle 501 can be automatically corrected to the initial position when it is not manually released.

[0045] Specifically, the housing 10 is provided with a plurality of limiting holes, and the handle 501 is provided with oblong sliding holes corresponding to the plurality of limiting holes. A limiting pin 15 is matched in one of the limiting holes. When the handle 501 is rotated, the limiting pin 15 slides in the oblong sliding hole, thereby limiting the rotation angle of the handle 501, making the operation more convenient.

[0046] See also Figure 4 In the present embodiment, when the ball 14 is provided, the handle 501 needs to be rotated when the armature 20 needs to be released. The handle 501 rotates, and the ball 14 rotates out from the groove 55 of the handle 501, and the ball 14 abuts against the end face of the handle 501. At this time, the distance between the handle 501 and the housing 10 increases, driving the pressure cover 507 and the second center column 506 away from the armature 20, thereby releasing the armature 20.

[0047] In some embodiments, an improved implementation of the above brake can be adopted as follows Figure 1 to Figure 2 See the structure shown. Figure 1 to Figure 2 , and further includes a dust cover 60, one axial end side wall of the dust cover 60 is connected to the outer peripheral surface of the housing 10, and the other axial end side wall is connected to the tail plate 40. The dust cover 60 cooperates with the housing 10 and the tail plate 40, so that the brake can effectively avoid the influence of oil and water stains on the friction area (near the friction disc 30), ensure the use effect of the brake, and extend the service life of the brake.

[0048] In some embodiments, a specific arrangement of the first spring 12 can be as follows: Figure 2 and Figure 4 See the structure shown. Figure 2 and Figure 4, a plurality of first springs 12 are provided, and the plurality of first springs 12 are evenly distributed around the axial direction of the housing 10. The specific distribution form of the first springs 12 can make the pressure applied to the first step 52 uniform, so that the armature 20 is evenly abutted against the friction disk 30, and the braking process is faster and more effective. Optionally, there can also be only one first spring 12, and one first spring 12 is sleeved on the outer ring of the third step 508, and the two ends of the first spring 12 in the axial direction respectively abut against the bottom of the spring hole of the housing 10 and the first step 52.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A brake with a manual release structure, characterized in that: It comprises a housing, and an armature, a friction plate, and a tail plate which are sequentially arranged at one axial end of the housing in the axial direction, and the housing has an electromagnetic coil and a first spring which are arranged toward the armature; The brake further comprises a release assembly for manually releasing the friction disc, the release assembly comprising a handle, a release column, a ball and a second spring, the handle is used to drive the release column to compress the first spring in the axial direction, the ball is located between the handle and the housing, the second spring acts on the release column and directly or indirectly makes the handle close to the ball; The release column passes through the shell along the axis of the shell, and has a first step, a third step and a receiving groove. The outer diameter of the first step is larger than the outer diameter of the third step, and the first step and the third step are distributed in sequence in the direction away from the armature. The shell has a first mounting groove adapted to the first step and the third step; the first step abuts against the armature under the action of the first spring, the third step at least partially overlaps with the projection of the ball in the axial direction, and the receiving groove is an installation space formed by a depression in the axial direction, which is used to place the second spring.

2. The brake with a manual release structure according to claim 1, characterized in that: The release column includes a first center column and a release plate, the first center column has a second step, the release plate is sleeved on the outer periphery of the first center column and has a second mounting groove adapted to the second step, the handle is fixedly connected to the first center column by fasteners, and the first step and the third step are both arranged on the release plate.

3. The brake with manual release structure according to claim 2, characterized in that: The fasteners are provided in three numbers and are evenly distributed around the axis of the brake.

4. The brake with a manual release structure as claimed in claim 2, characterized in that: The receiving groove is located at the groove bottom surface of the second installation groove. In the axial direction, the height of the second spring is greater than the depth of the receiving groove. The second spring is located between the third step and the second step.

5. The brake with a manual release structure as claimed in claim 4, characterized in that: The release assembly further includes a gasket disposed between the second step and the second spring, and two ends of the second spring in the axial direction respectively abut against the gasket and the bottom surface of the accommodating groove.

6. The brake with a manual release structure as claimed in claim 5, characterized in that: The gasket has one end surface facing the second step provided with a lubricating coating, or has both end surfaces provided with a lubricating coating.

7. The brake with a manual release structure according to claim 1, characterized in that: The release column includes a second center column and a pressure cover, the pressure cover is located at the end of the handle away from the shell, the second center column passes through the handle and is connected to the pressure cover, and the first step and the third step are both arranged on the second center column.

8. The brake with a manual release structure as claimed in claim 7, characterized in that: The accommodating groove is located on the side of the pressure cover facing the handle. In the axial direction, the height of the second spring is greater than the depth of the accommodating groove. The two ends of the second spring in the axial direction respectively abut against the handle and the bottom surface of the accommodating groove.

9. The brake with a manual release structure according to claim 1, characterized in that: The ball is always located in the ball groove of the shell, and a groove is provided on one end face of the handle facing the ball. The ball has a first state in which it is located in the groove, and a second state in which the ball is located outside the groove after the handle is rotated.

10. The brake with a manual release structure according to claim 1, characterized in that: It also includes a dust cover, wherein one axial end side wall of the dust cover is connected to the outer peripheral surface of the shell, and the other axial end side wall is connected to the tail plate.

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