A linkage brake device for power tools

Abstract

The embodiment of the present invention provides a linkage brake device for an electric tool, comprising: a linkage part with an outer sleeve arranged outside, a clutch, and a Hall element arranged on the clutch for outputting a brake signal; the Hall element comprises an induction component fixed to the clutch and a magnetic component passing through the clutch and in contact with the outer sleeve, and the induction component is connected to the magnetic component through a spring; when encountering resistance braking, the first steel ball pushes the outer sleeve of the linkage part away from the clutch, and the magnetic component continues to contact with the outer sleeve under the action of the spring and moves away from the induction component, and the induction component outputs a brake signal. The present application has a simple structure, low manufacturing cost, low brake noise during use, and no brake friction temperature is generated due to the lack of a mechanical brake structure, and the failure rate is low.

Description

Technical Field

[0001] The present invention relates to the technical field of electric tools with brake structures, and in particular to a linkage brake device of an electric tool. Background Art

[0002] With the development of science and technology, the tools people use have changed from manual tools to more convenient power tools, which have played an important role in people's lives. Tools, especially power tools, can be used in many industries now.

[0003] With the increasing requirements for safety and durability of power tools, some power tools such as electric drills, electric wrenches and electric screwdrivers have brake structures that allow the power tools to brake when braking resistance occurs, thereby ensuring the safety of use and reducing the failure rate of power tools.

[0004] The electric tools with internal brakes (mechanical brake structures) currently used in the prior art have complex structures, high costs, complicated assembly, and high failure rates. In addition, the internal brake structures in the prior art are all mechanical structures, which produce loud noises during braking and generate high temperatures due to friction, thereby reducing the service life of the electric tools. Summary of the invention

[0005] In view of the above problems, embodiments of the present invention are proposed to provide a linkage brake device for an electric tool that overcomes the above problems or at least partially solves the above problems.

[0006] In order to solve the above problems, an embodiment of the present invention discloses a linkage brake device for an electric tool, comprising:

[0007] A linkage part with an outer sleeve, a clutch, and a Hall element arranged on the clutch for outputting a brake signal are arranged on the outside;

[0008] An outer sleeve is disposed outside the linkage part, and the outer sleeve contacts the clutch, so that a cavity is formed inside the outer sleeve and the clutch;

[0009] A transmission shaft and a first steel ball are arranged in the cavity to contact each other and are used to push the linkage part away from the clutch when braking;

[0010] The Hall element comprises an inductive component fixed to the clutch and a magnetic component passing through the clutch and in contact with the outer sleeve, wherein the inductive component is connected to the magnetic component via a spring;

[0011] When encountering resistance braking, the first steel ball pushes the outer sleeve of the linkage part away from the clutch, and the magnetic component continues to contact the outer sleeve under the action of the spring and moves away from the induction component, and the induction component outputs a braking signal.

[0012] Furthermore, the rear end of the transmission shaft at least partially protrudes from the clutch, and the front end is provided with a wheel disc, and the wheel disc is at least partially located in the outer sleeve;

[0013] The wheel disc is symmetrically provided with at least two protrusions, and each of the protrusions is provided with two symmetrical slopes;

[0014] The protrusion at least partially conflicts with the first steel balls, and the first steel balls conflict with the linkage part, wherein the number of the first steel balls is the same as the number of the protrusions.

[0015] Furthermore, the sensing component includes a Hall seat and a Hall switch;

[0016] The Hall seat is fixed to the side end of the clutch by screws;

[0017] The Hall switch is embedded in the front end of the Hall seat and is located at a position connected to one end of the spring.

[0018] Furthermore, the magnetic component includes: a rod seat, a rod column and a magnet;

[0019] The rod column passes through a through hole at one end of the clutch and is in contact with the outer sleeve;

[0020] The outer periphery of the rod seat is connected to the other end of the spring;

[0021] The rod seat is also provided with a groove matching the magnet, and the magnet is placed in the groove, and the surface of the magnet is flush with the notch of the groove.

[0022] Further, it also includes an output shaft;

[0023] The output shaft comprises a front shaft, a shaft disc and a rear shaft which are integrated into one body, wherein the front shaft at least partially protrudes from the front end of the outer sleeve, the shaft disc is provided with a first hole having a diameter larger than the first steel ball, and the first steel ball is at least partially located in the first hole;

[0024] The shaft disc is located between the protrusion and the internal structure of the linkage portion;

[0025] The rear axle is at least partially plugged into the transmission shaft, the rear axle is provided with a bead groove matching the second hole, and the second hole is provided on the transmission shaft and located at the rear end of the wheel disc;

[0026] The second hole and the ball groove form a space matching the second steel ball and completely accommodating the second steel ball.

[0027] Furthermore, a first bearing is provided in the clutch, and the axis of the first bearing is sleeved on the rear end of the wheel disc of the transmission shaft.

[0028] Furthermore, two first bearings are arranged side by side.

[0029] Furthermore, a second bearing is provided in the end of the clutch, and the axis of the second bearing is sleeved on the tail end of the transmission shaft.

[0030] Furthermore, the linkage unit also includes:

[0031] A first plane bearing pad, an inner sleeve, and a second plane bearing pad are arranged in the outer sleeve and are sleeved on the front shaft of the output shaft in sequence;

[0032] The outer diameter of the inner sleeve is smaller than the outer diameter of the first surface plane bearing pad;

[0033] The outer diameter of the first planar bearing pad is equal to the outer diameter of the second planar bearing pad.

[0034] Furthermore, the outer layer of the inner sleeve is also provided with a third steel ball.

[0035] The embodiments of the present invention include the following advantages: through the linkage part, the clutch and the first steel ball, when encountering braking resistance, the first steel ball causes the linkage part to separate from the clutch, thereby causing the Hall element to generate a braking signal for braking. The present application has a simple structure, low manufacturing cost, low braking noise during use, and since there is no mechanical braking structure, no braking friction temperature will be generated, and the failure rate is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a cross-sectional structural schematic diagram of an embodiment of a linkage brake device of an electric tool of the present invention;

[0037] Figure 2 The diagram is a schematic diagram of the exploded structure of an embodiment of a linkage brake device of an electric tool of the present invention.

[0038] The accompanying drawings are as follows:

[0039] 1. Clutch; 2. Outer sleeve; 3. Hall element; 4. First steel ball; 5. Transmission shaft; 6. Output shaft; 7. Second steel ball; 8. First bearing; 9. Second bearing; 11. Through hole; 21. First plane bearing pad; 22. Inner sleeve; 23. Second plane bearing pad; 24. Third steel ball; 31. Hall seat; 32. Hall switch; 33. Magnetic component; 34. Magnet; 35. Spring; 36. Screw; 51. Tail end; 52. Wheel disc; 53. Protrusion; 54. Second hole; 61. Front axle; 62. Shaft disc; 63. Rear axle; 64. First hole; 65. Bead groove; 331. Rod column; 332. Rod seat. DETAILED DESCRIPTION

[0040] In order to make the above-mentioned objects, features and advantages of the present invention more distinct and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] One of the core concepts of the embodiment of the present invention is that, through the linkage part, the clutch and the first steel ball, when encountering braking resistance, the first steel ball causes the linkage part to separate from the clutch, thereby causing the Hall element to generate a braking signal for braking. The present application has a simple structure, low manufacturing cost, low braking noise during use, and since there is no mechanical braking structure, no braking friction temperature will be generated, and the failure rate is low.

[0042] Reference Figure 1-2 , shows a linkage brake device of an electric tool of the present invention, which may specifically include:

[0043] A linkage part with an outer sleeve 2, a clutch 1, and a Hall element 3 arranged on the clutch 1 for outputting a brake signal; the linkage part is provided with an outer sleeve 2 on the outside, the outer sleeve 2 is in contact with the clutch 1, so that a cavity is formed in the outer sleeve 2 and the clutch 1; a transmission shaft 5 and a first steel ball 4 are provided in the cavity for pushing the linkage part away from the clutch 1 when braking; the Hall element 3 includes an induction component fixed to the clutch 1 and a magnetic component 33 passing through the clutch 1 and in contact with the outer sleeve 2, the induction component is connected to the magnetic component 33 through a spring 35; when encountering resistance braking, the first steel ball 4 pushes the outer sleeve 2 of the linkage part away from the clutch 1, and the magnetic component 33 continues to contact with the outer sleeve 2 under the action of the spring 4 and stays away from the induction component, and the induction component outputs a brake signal.

[0044] The Hall element 3 is a semiconductor magnetoelectric device with a firm structure, small size, light weight, long life, easy installation, low power consumption, high frequency (up to 1MHZ), vibration resistance, and no fear of pollution or corrosion from dust, oil, water vapor, salt spray, etc. Compared with the internal brake type electric tools currently used in the prior art, the structure is simpler, the cost is low, it is easy to assemble, and the failure rate is reduced; and compared with the mechanical internal brake structure in the prior art, since the Hall element 3 is used, there will be no braking noise and high temperature due to friction, thereby improving work efficiency and service life.

[0045] In one embodiment, the tail end 51 of the transmission shaft 5 at least partially protrudes from the clutch 1, and a wheel disc 52 is provided at the head end, and the wheel disc 52 is at least partially located in the outer sleeve 2; the wheel disc 52 is symmetrically provided with at least two protrusions 53, and each of the protrusions 53 is provided with two symmetrical slopes; the protrusions 53 at least partially conflict with the first steel balls 4, and the first steel balls 4 conflict with the linkage part, wherein the number of the first steel balls 4 and the number of the protrusions 53 are the same.

[0046] In the above embodiment, the first steel ball 4 gradually pushes the linkage part away from the clutch 1 through one side of the two symmetrical slopes on the protrusion 53, so that the Hall element 3 outputs a brake signal; when a braking action is completed, the first steel ball 4 is gradually released from the other side of the two symmetrical slopes on the protrusion 53, so that the linkage part reduces the distance from the clutch 1 until the outer sleeve 2 of the linkage part conflicts with the clutch 1, so that the Hall element 3 outputs a brake signal, and both braking and recovery can have a buffering process, further improving the reliability and service life of the tool.

[0047] In one embodiment, the sensing component includes a Hall seat 31 and a Hall switch 32; the Hall seat 31 is fixed to the side end of the clutch 1 by a screw 36; the Hall switch 32 is embedded in the front end of the Hall seat 31 and is located at a position connected to one end of the spring 35.

[0048] Furthermore, the magnetic component 33 includes: a rod seat 332, a rod column 331 and a magnet 34; the rod column 331 passes through the through hole 11 at one end of the clutch 1 and is in contact with the outer sleeve 2; the outer periphery of the rod seat 332 is connected to the other end of the spring 4; the rod seat 332 is also provided with a groove matching the magnet 34, and the magnet 34 is placed in the groove, and the surface of the magnet 34 is flush with the notch of the groove.

[0049] In the above embodiment, when the clutch 1 is separated from the outer sleeve 2, the spring 35 pushes the rod column 331 along the through hole 11 toward the outer sleeve 2 through the rod seat 332, so that the magnet 34 is separated from the Hall switch 32 fixed on the Hall seat 31. When it moves to a certain distance, the distance between the magnet 34 and the Hall switch 32 increases, and the magnetic force on the Hall switch 32 disappears to generate an electrical signal (i.e., a brake signal).

[0050] In one embodiment, it also includes an output shaft 6; the output shaft 6 includes a front shaft 61, a shaft disc 62 and a rear shaft 63 which are integrated into one body, the front shaft 61 at least partially protrudes from the front end of the outer sleeve, the shaft disc 62 is provided with a first hole 64 with a diameter larger than the first steel ball 4, and the first steel ball 4 is at least partially located in the first hole 64; the shaft disc 62 is located between the protrusion 53 and the internal structure of the linkage part; the rear shaft 63 is at least partially inserted into the transmission shaft 5, and the rear shaft 63 is provided with a ball groove 65 matching the second hole 54, the second hole 54 is provided on the transmission shaft 5 and located at the rear end of the wheel disc 52; the second hole 54 and the ball groove 65 form a space matching the second steel ball 7 and fully accommodate the second steel ball 7.

[0051] In the above embodiment, the second steel ball 7 cooperates with the second hole 54 and the ball groove 65 to transmit the power from the drive shaft 5 to the output shaft 6 .

[0052] In one embodiment, a first bearing 8 is further disposed in the clutch 1 , and the axis of the first bearing 8 is sleeved on the rear end of the wheel disc 52 of the transmission shaft 5 .

[0053] Furthermore, two first bearings 8 are arranged side by side.

[0054] Furthermore, a second bearing 9 is provided in the end of the clutch 1 , and the axis of the second bearing 9 is sleeved on the tail end 51 of the transmission shaft 5 .

[0055] By providing the first bearing 8 and the second bearing 9, each part of the transmission shaft 5 is in a relatively balanced state when it rotates.

[0056] In one embodiment, the linkage part also includes: a first planar bearing pad 21, an inner sleeve 22, and a second planar bearing pad 23 which are arranged in the outer sleeve 2 and are sequentially sleeved on the front shaft 61 of the output shaft 6; the outer diameter of the inner sleeve 22 is smaller than the outer diameter of the first planar bearing pad 21; the outer diameter of the first planar bearing pad 21 is equal to the outer diameter of the second planar bearing pad 23.

[0057] Furthermore, the outer layer of the inner sleeve 22 is also provided with a third steel ball 24 .

[0058] In the above embodiment, the first planar bearing pad 21, the inner sleeve 22, the second planar bearing pad 23 and the third steel ball 24 form a bearing structure inside the outer sleeve 2 and at the position of the front shaft 61 of the output shaft 6, thereby reducing the rotational resistance of the output shaft 6. Due to the movable structure, when the first planar bearing pad 21, the inner sleeve 22, the second planar bearing pad 23 and the third steel ball 24 are severely worn, the components therein can be replaced as needed without replacing the entirety.

[0059] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0060] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present invention.

[0061] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or terminal device including the elements.

[0062] The above is a detailed introduction to the linkage brake device of an electric tool provided by the present invention. Specific examples are used in this article to illustrate the principle and implementation mode of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation mode and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A linkage brake device for an electric tool, characterized in that: include: A linkage part with an outer sleeve, a clutch, and a Hall element arranged on the clutch for outputting a brake signal are arranged on the outside; An outer sleeve is disposed outside the linkage part, and the outer sleeve contacts the clutch, so that a cavity is formed inside the outer sleeve and the clutch; A transmission shaft and a first steel ball are arranged in the cavity to contact each other and are used to push the linkage part away from the clutch when braking; The Hall element comprises an inductive component fixed to the clutch and a magnetic component passing through the clutch and abutting against the outer sleeve, wherein the inductive component is connected to the magnetic component via a spring; wherein the inductive component comprises a Hall switch; When encountering resistance braking, the first steel ball pushes the outer sleeve of the linkage part away from the clutch, and the magnetic component continues to contact the outer sleeve under the action of the spring and moves away from the induction component, and the induction component outputs a braking signal.

2. The device according to claim 1, characterized in that The rear end of the transmission shaft at least partially protrudes from the clutch, and the front end is provided with a wheel disc, and the wheel disc is at least partially located in the outer sleeve; The wheel disc is symmetrically provided with at least two protrusions, and each of the protrusions is provided with two symmetrical slopes; The protrusion at least partially conflicts with the first steel balls, and the first steel balls conflict with the linkage part, wherein the number of the first steel balls is the same as the number of the protrusions.

3. The device according to claim 1, characterized in that The induction component also includes a Hall seat; The Hall seat is fixed to the side end of the clutch by screws; The Hall switch is embedded in the front end of the Hall seat and is located at a position connected to one end of the spring.

4. The device according to claim 3, characterized in that The magnetic component comprises: a rod seat, a rod column and a magnet; The rod column passes through a through hole at one end of the clutch and is in contact with the outer sleeve; The outer periphery of the rod seat is connected to the other end of the spring; The rod seat is also provided with a groove matching the magnet, and the magnet is placed in the groove, and the surface of the magnet is flush with the notch of the groove.

5. The device according to claim 2, characterized in that Also includes an output shaft; The output shaft comprises a front shaft, a shaft disc and a rear shaft which are integrated into one body, wherein the front shaft at least partially protrudes from the front end of the outer sleeve, the shaft disc is provided with a first hole having a diameter larger than the first steel ball, and the first steel ball is at least partially located in the first hole; The shaft disc is located between the protrusion and the internal structure of the linkage portion; The rear axle is at least partially plugged into the transmission shaft, the rear axle is provided with a bead groove matching the second hole, and the second hole is provided on the transmission shaft and located at the rear end of the wheel disc; The second hole and the ball groove form a space matching the second steel ball and completely accommodating the second steel ball.

6. The device according to claim 1, characterized in that A first bearing is also provided in the clutch, and the axis of the first bearing is sleeved on the rear end of the wheel disc of the transmission shaft.

7. The device according to claim 6, characterized in that The first bearings are arranged in two parallel configurations.

8. The device according to claim 1, characterized in that A second bearing is also arranged in the end of the clutch, and the axis of the second bearing is sleeved on the tail end of the transmission shaft.

9. The device according to claim 1, characterized in that The linkage unit also includes: A first plane bearing pad, an inner sleeve, and a second plane bearing pad are arranged in the outer sleeve and are sleeved on the front shaft of the output shaft in sequence; The outer diameter of the inner sleeve is smaller than the outer diameter of the first surface plane bearing pad; The outer diameter of the first planar bearing pad is equal to the outer diameter of the second planar bearing pad.

10. The device according to claim 9, characterized in that The outer layer of the inner sleeve is also provided with a third steel ball.

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