A purely mechanical friction brake and a method of operation thereof

Abstract

The present application relates to a kind of pure mechanical friction brake and its working method, including input shaft disc, spacer, copper friction plate, steel friction plate, rear end plate, output shaft, spring, spring backing plate, bearing, pin, cam, lever, bearing.Compared with prior art, the pure mechanical friction brake of the present application is entirely composed of mechanical parts, the size of brake friction can be set by adjusting the friction plate and spring, the compression length of spring is adjusted by the extrusion of lever on cam, so as to adjust the extrusion force between friction plate, finally realize the conversion of brake and drive of cam, to realize the function of basic brake, at the same time, automatic parking can be realized when power failure occurs to deal with emergency.

Description

Technical Field

[0001] This invention relates to the field of brake technology, and in particular to a purely mechanical friction brake and its working method. Background Technology

[0002] A brake is a device that slows down, stops, or keeps a moving part (or machine) at a stop. It is a mechanical component that stops or slows down moving parts in machinery, commonly known as a brake or brake. A brake mainly consists of a frame, braking components, and an operating device. Some brakes also have an automatic adjustment device for the clearance of the braking components.

[0003] Friction brakes use friction resistance to brake moving objects. They have the advantages of simple structure and low cost. However, most friction brakes are combined brakes, which may not be able to stop automatically in case of sudden power failure or other emergencies.

[0004] Therefore, there is an urgent need for a purely mechanical friction brake that can perform basic braking functions and automatically stop the vehicle in the event of a sudden power outage to cope with emergency situations. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a purely mechanical friction brake. The purely mechanical friction brake in this solution is composed entirely of mechanical parts. The braking friction force can be set by adjusting the friction pads and springs. The compression length of the spring can be adjusted by pressing the cam with a lever, thereby adjusting the squeezing force between the friction pads. Finally, the braking and driving functions of the cam can be switched to achieve the basic braking function. At the same time, it can automatically stop in the event of a sudden power failure to deal with emergency situations.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] The first objective of this invention is to provide a purely mechanical friction brake, comprising an input shaft disc, a spacer, copper friction plates, steel friction plates, a rear end plate, an output shaft, a spring, a spring support plate, a bearing, a pin, a cam, a lever, and a bearing; the input shaft disc is coaxial with the cam and the output shaft; the lever and the bearing are fixed on the input shaft disc; the cam and the output shaft are in clearance fit; the cam and the steel friction plates are in clearance fit; the copper friction plates are in clearance fit with the pin; the steel and copper friction plates are alternately arranged on the cam; the spacer is fixed on the pin; the cam and the spring support plate are mutually fitted through the bearing; and a spring is placed between the spring support plate and the rear end plate.

[0008] Furthermore, the lever is tangent to the working surface of the cam.

[0009] Furthermore, the purely mechanical friction brake also includes a first flat key; the cam and the output shaft are fitted with a clearance through the first flat key;

[0010] Furthermore, the purely mechanical friction brake also includes a second flat key; the cam and the steel friction plate are fitted together with a clearance through the second flat key.

[0011] Furthermore, the distance between the spacer ring and the bottom of the cam is equal to the movement distance of the steel friction plate and the copper friction plate.

[0012] Furthermore, the steel friction plate and the copper friction plate are coaxial with the cam.

[0013] Furthermore, the braking friction force of the purely mechanical friction brake is increased by increasing the number of steel and copper friction plates, increasing the area of ​​steel and copper friction plates, and increasing the friction coefficient of steel and copper friction plates.

[0014] Furthermore, the braking friction force of the purely mechanical friction brake is increased by increasing the compression length of the spring and selecting a spring with a high elastic coefficient.

[0015] The second objective of this invention is to provide a method for operating the aforementioned purely mechanical friction brake, wherein the braking friction force is set by adjusting the steel friction pad, the copper friction pad, and the spring, and the compression length of the spring is adjusted by using a lever to press the cam, thereby adjusting the pressing force between the steel friction pad and the copper friction pad, ultimately realizing the conversion between braking and driving the cam.

[0016] Furthermore, the specific working method is as follows: As the input shaft disk rotates, the lever, driven by the input shaft disk, gradually slides to the highest point of the cam's working surface, thereby squeezing the cam downwards to compress the spring. The squeezing force of the spring on the spring support plate cancels out the squeezing force of the lever on the cam, ultimately making the squeezing force between the steel friction plate and the copper friction plate zero. The distance between the spacer and the bottom of the cam also increases, eliminating braking friction. Thus, the lever drives the cam to rotate, and the cam drives the output shaft to rotate, i.e., braking is canceled during startup. When stopping, the input shaft disk speed drops to 0. Under the squeezing action of the spring and the inertia of the cam, the lever slides to the lowest point of the cam's working surface, and the cam moves upwards. Finally, under the squeezing action of the spring, the steel friction plate and the copper friction plate come into close contact, generating friction to brake the cam, thereby braking the output shaft, i.e., braking is achieved when stopping.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1) The present invention provides a purely mechanical friction brake, which uses a cam and a spring to adjust the friction force of the friction pads, so as to realize a purely mechanical braking device that can automatically brake when the power is off.

[0019] 2) The present invention provides a purely mechanical friction brake, which is composed entirely of mechanical parts. The braking friction force can be set by adjusting the friction pads and springs. When the purely mechanical friction brake is working, the compression length of the spring is adjusted by pressing the cam with a lever, thereby adjusting the squeezing force between the friction pads. Finally, the braking and driving functions of the cam are switched to achieve the basic braking function. At the same time, it can automatically stop in the event of a sudden power failure to deal with the occurrence of emergency. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of a purely mechanical friction brake in an embodiment of the present invention.

[0021] Figure 2 , Figure 3 This is a partial cross-sectional schematic diagram of a purely mechanical friction brake in an embodiment of the present invention.

[0022] Figure 4 This is a schematic diagram of the braking structure of a purely mechanical friction brake in an embodiment of the present invention.

[0023] Figure 5 This is a schematic diagram of the structure of a purely mechanical friction brake in an embodiment of the present invention when it is not braking.

[0024] The numbers in the diagram are as follows:

[0025] 1. Input shaft plate, 2. Spacer ring, 3. Copper friction plate, 4. Steel friction plate, 5. Rear end plate, 6. Output shaft, 7. Spring, 8. Spring support plate, 9. First bearing, 10. Pin, 11. Cam, 12. Lever, 13. First flat key, 14. Second bearing, 15. Second flat key. Detailed Implementation

[0026] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. Component models, material names, connection structures, and other features not explicitly described in this invention are considered common technical features disclosed in the prior art.

[0027] Example

[0028] like Figures 1-5 As shown, this embodiment provides a purely mechanical friction brake, including an input shaft disc 1, a spacer 2, a copper friction plate 3, a steel friction plate 4, a rear end plate 5, an output shaft 6, a spring 7, a spring support plate 8, a first bearing 9, a pin 10, a cam 11, a lever 12, a first flat key 13, a second bearing 14, and a second flat key 15.

[0029] The input shaft disk 1 is coaxial with the cam 11 and the output shaft 6. The lever 12 and the second bearing 14 are fixed on the input shaft disk 1, and the lever 12 is tangent to the working surface of the cam 11.

[0030] The cam 11 and the output shaft 6 are fitted with a clearance through the first flat key 13. The first flat key 13 is located between the cam 11 and the output shaft 6; the two sides of the first flat key 13 are fitted with the cam 11 and the output shaft 6 respectively with clearance.

[0031] The cam 11 and the steel friction plate 4 are fitted with a clearance through the second flat key 15. The second flat key 15 is located between the cam 11 and the steel friction plate 4; the two sides of the second flat key 15 are fitted with the cam 11 and the steel friction plate 4 respectively.

[0032] The copper friction plate 3 is clearance-fitted with the pin 10. The steel friction plate 4 and the copper friction plate 3 are alternately placed on the cam 11 and are coaxial with the cam 11. The spacer 2 is fixed on the pin 10, and the distance between the spacer 2 and the bottom of the cam 11 is equal to the movement distance of the friction plate 4 and the copper friction plate 3. The cam 11 and the spring support plate 8 are fitted together by the first bearing 9, and the spring 7 is placed between the spring support plate 8 and the rear end plate 5.

[0033] By changing the contact area and number of steel friction pads 4 and copper friction pads 3, as well as the number and elastic coefficient of springs 7, the braking capacity of the entire purely mechanical friction brake can be controlled.

[0034] like Figure 4 , 5 As shown, the working (braking) method of the above-mentioned purely mechanical friction brake is as follows:

[0035] As the input shaft disk 1 rotates, the lever 12, driven by the input shaft disk 1, gradually slides to the highest point of the working surface of the cam 11, thereby squeezing the cam 11 downwards and compressing the spring 7. Ultimately, the squeezing force between the steel friction plate 4 and the copper friction plate 3 becomes zero, generating no braking friction. Thus, the lever 12 drives the cam 11 to rotate, and the cam 11 drives the output shaft 6 to rotate. When the speed of the input shaft disk 1 drops to 0, under the squeezing action of the spring 7 and the inertia of the cam 11, the lever 12 slides to the lowest point of the working surface of the cam 11, and the cam 11 moves upwards. Finally, under the squeezing action of the spring 7, the steel friction plate 4 and the copper friction plate 3 come into close contact, generating friction to brake the cam 11, thereby braking the output shaft 6 and stopping the machine.

[0036] The above-mentioned purely mechanical friction brake is used as follows:

[0037] When not in operation, under the compression of spring 7, steel friction plate 4, copper friction plate 3 and spacer are in close contact, braking cam 11 through friction. Cam 11 and output shaft 6 are in clearance fit through first flat key 13, thereby braking output shaft 6.

[0038] At startup, as the input shaft disk 1 rotates, the lever 12 gradually slides to the highest point of the action surface of the cam 11 under the drive of the input shaft disk 1, thereby squeezing the cam 11 to move downward and squeeze the spring 7. The squeezing force of the spring 7 on the spring support plate 8 and the squeezing force of the lever 12 on the cam 11 cancel each other out, ultimately making the squeezing force between the steel friction plate 4 and the copper friction plate 3 zero. The distance between the spacer 2 and the bottom of the cam 11 also increases, and no braking friction is generated. Thus, the lever 12 drives the cam 11 to rotate, and the cam 11 drives the output shaft 6 to rotate.

[0039] When the vehicle stops, the input shaft disk 1 rotates to 0. Under the compression of spring 7 and the inertia of cam 11, lever 12 slides to the lowest point of the working surface of cam 11, and cam 11 moves upward. Finally, under the compression of spring 7, steel friction plate 4 and copper friction plate 3 come into close contact to generate friction force to brake cam 11, thereby braking output shaft 6 and stopping the vehicle.

[0040] The braking friction force of the above-mentioned purely mechanical friction brake depends on the friction area, friction coefficient, and normal force. That is, to increase the braking friction force, one can increase the number of friction pads, increase the friction area of ​​the friction pads, increase the friction coefficient of the friction pads, increase the compression length of the spring, and select a spring with a high elastic coefficient.

[0041] In this embodiment, the friction force of the friction plate is controlled by a cam and a spring, so as to realize a purely mechanical braking device that can automatically brake when the power is off.

[0042] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.

Claims

1. A purely mechanical friction brake, characterized in that, Includes input shaft disc (1), spacer (2), copper friction plate (3), steel friction plate (4), rear end plate (5), output shaft (6), spring (7), spring support plate (8), first bearing (9), pin (10), cam (11), lever (12), second bearing (14); The input shaft disk (1) is coaxial with the cam (11) and the output shaft (6); The lever (12) and the second bearing (14) are fixed on the input shaft disk (1); The cam (11) and the output shaft (6) are fitted with a clearance through a first flat key (13); the first flat key (13) is located between the cam (11) and the output shaft (6); the two sides of the first flat key (13) are fitted with the cam (11) and the output shaft (6) respectively. The cam (11) and the steel friction plate (4) are fitted together by a second flat key (15); the second flat key (15) is located between the cam (11) and the steel friction plate (4); the two sides of the second flat key (15) are fitted together with the cam (11) and the steel friction plate (4) respectively. The copper friction plate (3) is fitted with the pin (10) with a clearance fit; The steel friction plate (4) and the copper friction plate (3) are alternately placed on the cam (11) and are coaxial with the cam (11); The spacer ring (2) is fixed on the pin (10); The cam (11) and the spring support plate (8) are connected by a first bearing (9); A spring (7) is placed between the spring support plate (8) and the rear end plate (5); The lever (12) is tangent to the working surface of the cam (11); The distance between the spacer (2) and the bottom of the cam (11) is equal to the movement distance of the steel friction plate (4) and the copper friction plate (3); When not in use, the steel friction plate (4), copper friction plate (3) and spacer (2) are in close contact under the compression of the spring (7).

2. The purely mechanical friction brake according to claim 1, characterized in that, The braking friction force of the purely mechanical friction brake is increased by increasing the number of steel friction plates (4) and copper friction plates (3), increasing the area of ​​steel friction plates (4) and copper friction plates (3), and increasing the friction coefficient of steel friction plates (4) and copper friction plates (3).

3. The purely mechanical friction brake according to claim 1, characterized in that, The braking friction force of the purely mechanical friction brake is increased by increasing the compression length of the spring (7) and selecting a spring (7) with a high elastic coefficient.

4. A method for operating a purely mechanical friction brake as described in any one of claims 1-3, characterized in that, The braking friction force is set by adjusting the steel friction plate (4), copper friction plate (3) and spring (7). The compression length of spring (7) is adjusted by pressing the cam (11) with lever (12), thereby adjusting the squeezing force between steel friction plate (4) and copper friction plate (3), and finally realizing the conversion of braking and driving of cam (11).

5. The working method of a purely mechanical friction brake according to claim 4, characterized in that, The specific working method is as follows: As the input shaft disk (1) rotates, the lever (12) gradually slides to the high point of the working surface of the cam (11) under the drive of the input shaft disk (1), thereby squeezing the cam (11) to move downward and squeeze the spring (7). The squeezing force of the spring (7) on the spring support plate (8) and the squeezing force of the lever on the cam (11) cancel each other out, so that the squeezing force between the steel friction plate (4) and the copper friction plate (3) is 0. The distance between the spacer (2) and the bottom of the cam (11) also increases, and no braking friction is generated. Thus, the lever (12) drives the cam (11) to rotate, and the cam (11) drives the output shaft (6) to rotate, that is, the braking is canceled when starting. When the car stops, the input shaft disk (1) rotates to 0. Under the squeezing action of the spring (7) and the inertia of the cam (11), the lever (12) slides to the lowest point of the working surface of the cam (11). The cam (11) moves upward. Finally, under the squeezing action of the spring (7), the steel friction plate (4) and the copper friction plate (3) come into close contact to generate friction to brake the cam (11), thereby braking the output shaft (6), that is, braking is achieved when the car stops.

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