Disc type reversing mechanism assembly structure for brushless signal switch and brushless signal switch

Abstract

The utility model relates to a disc type commutating mechanism assembly structure for brushless signal switch and brushless signal switch, through setting limit slot, circular arc groove and guide convex rail in the assembly hole inner wall of shell, corresponding setting limit convex strip, locating steel ball, clamping slot on commutating pivot, and setting the side of guide convex rail towards assembly hole outer end as inclined plane, making limit slot axial extension to assembly hole outer end, make commutating pivot can directly to assembly hole pressure equipment from assembly hole outer end, solve the technical problem that commutating pivot needs to install in advance in the shell inside of switch and lead to commutating mechanism assembly difficult, thereby greatly improve the assembly difficulty of commutating mechanism to reduce the production cost of switch.

Description

Technical Field

[0001] This utility model belongs to the field of switch technology, specifically relating to a disc-type commutator assembly structure for a brushless signal switch and a brushless signal switch. Background Technology

[0002] Brushless signal switches are widely used in the field of power tool control. Power tools often involve forward and reverse rotation during use, so brushless signal switches are also equipped with reversing functions. However, the assembly structure of conventional reversing mechanisms is relatively complex. For example, the reversing mechanism assembly structure disclosed in Chinese Patent CN216528575U, "Dustproof Structure of Toggle Reversing Switch and Reversing Speed ​​Control Switch Using the Structure", adopts a separate setting of reversing shaft and dial. The reversing shaft needs to be pre-installed inside the switch housing. When installing the reversing shaft into the housing, the space inside the housing is small, making it difficult to insert the clamp and align it, resulting in high assembly difficulty and high requirements for automatic assembly equipment. The investment cost of automatic assembly lines for this type of reversing mechanism assembly structure is high, thus the manufacturing cost of switch products is high. Utility Model Content

[0003] The primary technical problem to be solved by this invention is to provide an assembly structure for a disc-type commutation mechanism for a brushless signal switch, thereby addressing the technical issues of complex assembly structures and high assembly difficulty in traditional commutation mechanisms.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a disc-type commutation mechanism assembly structure for a brushless signal switch, including a housing, a commutation shaft, and a dial. The housing has a circular assembly hole, and an arc-shaped limiting groove extending circumferentially is provided on the inner circumferential wall of the assembly hole. One side of the limiting groove extends axially along the assembly hole to the outside of the housing. Three arc-shaped grooves arranged sequentially along the circumferential direction are also provided on the inner circumferential wall of the assembly hole. The three arc-shaped grooves are connected sequentially to form three gear slots when the commutation shaft is turned. The three arc-shaped grooves are directly opposite the limiting groove. A guide rail extending circumferentially is provided on the inner circumferential wall of the assembly hole between the limiting groove and the three arc-shaped grooves. The side of the guide rail facing the outer end of the assembly hole is an inclined surface towards the central axis of the assembly hole, and the side of the guide rail facing the inner end of the assembly hole is perpendicular to the inner circumferential surface of the assembly hole. The commutation shaft is cylindrical. The reversing shaft has an axially extending limiting protrusion on its outer circumferential surface. The thickness of the limiting protrusion along the diameter of the reversing shaft matches the depth of the limiting groove. The limiting protrusion is used to insert into the limiting groove and slide back and forth along the circumferential direction of the limiting groove to limit the rotation angle range of the reversing shaft. A radially extending blind hole is also provided on the outer circumferential surface of the reversing shaft. The opening end of the blind hole and the limiting protrusion are respectively located on both sides of the reversing shaft. A coil spring and a positioning steel ball are inserted into the blind hole. The blind hole corresponds to three arc-shaped grooves. Under the elastic force of the coil spring, the positioning steel ball is embedded in any of the arc-shaped grooves, so that the reversing shaft maintains its posture unchanged when it is not subjected to external tangential force. Two slots that cooperate with the guide rail are also provided on the outer circumferential surface of the reversing shaft. The length of the slot along the circumferential direction of the reversing shaft is greater than the length of the guide rail, so that the guide rail can slide in the slot. The dial is fixedly connected to the end of the reversing shaft opposite to the mounting hole.

[0005] As a preferred embodiment, the dial and the reversing shaft are integrally formed, and a lever is vertically connected to the edge of the dial opposite to the reversing shaft.

[0006] As a preferred embodiment, the two inner sides of the slot are parallel to the two outer sides that cooperate with the guide rail. The end of the reversing shaft inserted into the assembly hole is shaped like a frustum cone. Two axially extending arc-shaped grooves are provided on the end face of the reversing shaft inserted into the assembly hole. The two arc-shaped grooves are symmetrically arranged on both sides of the blind hole. The two circular arc-shaped grooves are respectively arranged on the outer wall of the assembly hole corresponding to the circular arc surface of the two arc-shaped grooves.

[0007] As a preferred embodiment, the reversing shaft has two riveting posts at the end opposite to the dial, and a reversing spring is sleeved on the two riveting posts. The reversing spring is riveted to the end of the reversing shaft through the riveting posts, and the reversing spring is coaxial with the reversing shaft.

[0008] As a preferred embodiment, a circuit board is fixedly connected inside the housing. The circuit board is located inside the mounting hole, and a reversing copper foil is provided on the circuit board. The reversing copper foil is directly opposite the mounting hole, and the reversing spring elastically abuts against the circuit board to connect the reversing copper foil.

[0009] The technical problem to be solved by this utility model is to provide a brushless signal switch, which solves the technical problem that the commutation mechanism of traditional brushless signal switches has a complex assembly structure and is difficult to assemble.

[0010] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: As a preferred embodiment, a brushless signal switch includes a housing, a circuit board fixedly connected inside the housing, a push rod movably inserted into the housing, a sliding spring fixedly connected to the inner end of the push rod and cooperating with the opening / closing copper foil and the adjusting carbon film on the circuit board, and a reset spring provided at the inner end of the push rod to reset it. The circuit board is connected to a lead wire harness, and also includes the aforementioned disc-type commutation mechanism assembly structure. The axial direction of the mounting hole on the housing is perpendicular to the axial direction of the push rod, and the mounting hole is located on the side of the housing opposite to the push rod of the circuit board. The commutation shaft and the push rod are located on opposite sides of the circuit board.

[0011] The beneficial effects of this utility model are as follows: By setting a limiting groove, an arc-shaped groove, and a guide rail on the inner wall of the assembly hole, and correspondingly setting a limiting protrusion, a positioning steel ball, and a slot on the reversing shaft, and setting the side of the guide rail facing the outer end of the assembly hole as an inclined surface, and extending the limiting groove axially to the outer end of the assembly hole, the reversing shaft can be directly pressed into the assembly hole from the outer end of the assembly hole. This solves the technical problem that the reversing shaft needs to be pre-installed inside the switch housing, which makes the assembly of the reversing mechanism difficult. This greatly increases the assembly difficulty of the reversing mechanism and reduces the production cost of the switch. Attached Figure Description

[0012] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, wherein: Figure 1 This is an exploded view of the assembly structure of the disc-type reversing mechanism described in Example 1; Figure 2 This is a schematic diagram of the specific structure of the reversing shaft described in Embodiment 1; Figure 3 This is a schematic diagram of the assembly hole on the housing as described in Embodiment 1; Figure 4 This is an exploded view of the brushless signal switch described in Example 2; Figures 1-4In the middle: 1. Housing; 2. Reversing shaft; 3. Dial; 4. Assembly hole; 5. Limiting groove; 6. Arc-shaped groove; 7. Guide rail; 701. Inclined surface; 8. Limiting protrusion; 9. Blind hole; 10. Coil spring; 11. Positioning steel ball; 12. Slot; 13. Lever; 14. Riveting post; 15. Reversing spring; 16. Circuit board; 17. Reversing copper foil; 18. Push rod; 19. Sliding spring; 20. Return spring; 21. Lead-out wire harness; 22. Bow-shaped groove. Detailed Implementation

[0013] The specific implementation scheme of this utility model will now be described in detail with reference to the accompanying drawings. Example 1

[0014] like Figures 1-3 The diagram illustrates a disc-type commutation mechanism assembly structure for a brushless signal switch, comprising a housing 1, a commutation shaft 2, and a dial 3. The housing 1 has a circular assembly hole 4, and the inner circumferential wall of the assembly hole 4 has a circumferentially extending arc-shaped limiting groove 5. One side of the limiting groove 5 extends axially along the assembly hole 4 to the outside of the housing 1. The inner circumferential wall of the assembly hole 4 also has three arc-shaped grooves 6 arranged sequentially along the circumferential direction. The three arc-shaped grooves 6 are sequentially connected to form the commutation shaft 2. The three-position slots are aligned with the limiting slots 5. Three arc-shaped grooves 6 are directly opposite each other. A guide rail 7 extending circumferentially is provided on the inner circumferential wall of the mounting hole 4 between the limiting slot 5 and the three arc-shaped grooves 6. The side of the guide rail 7 facing the outer end of the mounting hole 4 is an inclined surface 701 facing the central axis of the mounting hole 4. The side of the guide rail 7 facing the inner end of the mounting hole is perpendicular to the inner circumferential surface of the mounting hole 4. The reversing shaft 2 is cylindrical, and an axially extending limiting rail is provided on the outer circumferential surface of the reversing shaft 2. The thickness of the limiting protrusion 8 along the diameter direction of the reversing shaft 2 matches the depth of the limiting groove 5. The limiting protrusion 8 is used to insert into the limiting groove 5 and slide back and forth along the circumference of the limiting groove 5 to limit the rotation angle range of the reversing shaft 2. A radially extending blind hole 9 is also provided on the outer circumferential surface of the reversing shaft 2. The opening end of the blind hole 9 and the limiting protrusion 8 are respectively located on both sides of the reversing shaft 2. A coil spring 10 and a positioning steel ball 11 are inserted into the blind hole 9. The reversing shaft 2 is inserted from the outer end of the assembly hole 4. The blind hole 9 and the limiting protrusion 8 are connected to the limiting groove 5. Three arc-shaped grooves 6 correspond to each other. The positioning steel ball 11 is embedded in any arc-shaped groove 6 under the elastic force of the coil spring 10, so that the reversing shaft 2 maintains its circumferential orientation unchanged when it is not subjected to external tangential force. Two slots 12 that cooperate with the guide rail 7 are also provided on the outer circumferential surface of the reversing shaft 2. The length of the slot 12 along the circumferential direction of the reversing shaft 2 is greater than the length of the guide rail 7, so that the guide rail 7 can slide in the slot 12. The dial 3 is fixedly connected to the end of the reversing shaft 2 that is opposite to the mounting hole 4.

[0015] In the disc-type reversing mechanism assembly structure described in this embodiment, the reversing shaft 2 can be directly inserted into the assembly hole 4 from its outer end for press-fitting. During press-fitting, the guide rail 7 and / or the reversing shaft 2 undergo elastic deformation, causing the guide rail 7 to pass over the reversing shaft 2 body on one side of the slot 12 and engage with it, thus axially limiting the reversing shaft 2. This installation method avoids the problem of the reversing shaft 2 needing to be pre-installed inside the switch housing 1, which can greatly improve the assembly convenience of the reversing mechanism, thereby improving assembly efficiency and reducing production costs.

[0016] In this embodiment, the dial 3 and the reversing shaft 2 are preferably designed as a single piece to reduce the number of parts and simplify the assembly process. A lever 13 is vertically connected to one end edge of the dial 3 opposite to the reversing shaft 2. The lever 13 is used by the user to turn the dial 3 to drive the reversing shaft 2 to rotate, and can also be used by the robotic arm to position the dial 3 and the reversing shaft 2.

[0017] The two inner sides of the slot 12 are respectively parallel to the two outer sides of the guide rail 7. In particular, the inner side wall of the slot 12 away from the dial 3 is perpendicular to the outer circumferential surface of the reversing shaft 2, ensuring that the guide rail 7 can restrict the reversing shaft 2 from coming out of the assembly hole 4 after it is inserted into the slot 12.

[0018] like Figure 2 As shown, one end of the reversing shaft 2 inserted into the assembly hole 4 is shaped like a frustum of a cone. Two axially extending arc-shaped grooves 22 are formed on the end face of the reversing shaft 2 inserted into the assembly hole 4. The two arc-shaped grooves 22 are symmetrically arranged on both sides of the blind hole 9. Two arc-shaped grooves 6 are respectively arranged on the outer wall of the assembly hole 4 corresponding to the arc surfaces of the two arc-shaped grooves 22. The arc-shaped grooves 22 reduce material costs and increase the elasticity of the outer wall of the reversing shaft 2, facilitating inward deformation of the outer wall during press-fitting to avoid the guide rail 7, allowing the guide rail 7 to smoothly engage with the slot 12.

[0019] like Figure 2 As shown, in this embodiment, two riveting posts 14 are provided at one end of the reversing shaft 2 that is opposite to the dial 3. A reversing spring 15 is sleeved on the two riveting posts 14. The reversing spring 15 is riveted to the end of the reversing shaft 2 through the riveting posts 14. The reversing spring 15 is coaxially arranged with the reversing shaft 2.

[0020] The reversing spring 15 can be pre-riveted to the reversing shaft 2, so that the reversing spring 15, the reversing shaft 2 and the dial 3 form a whole, and then be assembled onto the housing 1, which makes the assembly more convenient.

[0021] like Figure 1As shown, a circuit board 16 is also fixedly connected inside the housing 1. The circuit board 16 is located inside the mounting hole 4. A reversing copper foil 17 is provided on the circuit board 16. The reversing copper foil 17 is directly opposite to the mounting hole 4. The reversing spring 15 elastically abuts against the circuit board 16 to connect the reversing copper foil 17.

[0022] The assembly process of the disc-type reversing mechanism assembly structure described in Embodiment 1 is as follows: Figure 1 and Figure 2 As shown, first, the circuit board 16 is installed inside the switch housing 1, and the housing 1 is closed. Then, the reversing spring 15 is pre-riveted to the riveting post 14 on the reversing shaft 2. The riveting post can fix the reversing spring 15 and also position the reversing spring 15. Finally, the coil spring 10 is inserted into the blind hole 9, and the positioning steel ball 11 is inserted to press down the positioning steel ball 11. The reversing shaft 2 is then inserted into the assembly hole 4, so that the limiting protrusion 8 is inserted into the limiting groove 5, the positioning steel ball 11 is engaged in the arc-shaped groove 6, and the guide rail 7 is engaged in the slot 12, completing the assembly.

[0023] Compared with the traditional separate structure of the reversing shaft and dial, and the installation method of the reversing shaft being pre-installed in the housing, the assembly structure adopted in this embodiment 1 is easier to assemble and has higher assembly precision. Example 2

[0024] like Figure 4 The brushless signal switch shown includes a housing 1, a circuit board 16 fixedly connected inside the housing 1, a push rod 18 movably inserted into the housing 1, and a sliding spring 19 fixedly connected to the inner end of the push rod 18 and cooperating with the opening and closing copper foil and the adjusting carbon film on the circuit board 16. The inner end of the push rod 18 is also provided with a reset spring 20 to reset it. The circuit board 16 is connected with a lead wire harness 21. It also includes the disc-type reversing mechanism assembly structure described in Embodiment 1 above. The axial direction of the assembly hole 3 on the housing 1 is perpendicular to the axial direction of the push rod 18. The assembly hole 3 is set on the side of the housing 1 opposite to the push rod 18 of the circuit board 16. The reversing shaft 2 and the push rod 18 are respectively located on both sides of the circuit board 16.

[0025] This embodiment applies the disc-type commutation mechanism assembly structure described in Embodiment 1 to a brushless signal switch, thereby solving the technical problem that the commutation shaft 2 needs to be pre-installed inside the switch housing 1, which makes the assembly of the commutation mechanism difficult. This greatly increases the overall assembly difficulty of the brushless signal switch and reduces the production cost of the switch.

[0026] The above embodiments are merely illustrative of the principles and effects of the present invention, as well as some examples of its application, and are not intended to limit the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the inventive concept of the present invention, and these modifications and improvements are all within the scope of protection of the present invention.

Claims

1. A disc-type commutation mechanism assembly structure for a brushless signal switch, comprising a housing (1), a commutation shaft (2), and a dial (3), characterized in that, The housing (1) has a circular assembly hole (4). The inner circumferential wall of the assembly hole (4) is provided with a circumferentially extending arc-shaped limiting groove (5). One side of the limiting groove (5) extends along the axial direction of the assembly hole (4) to the outside of the housing (1). The inner circumferential wall of the assembly hole (4) is also provided with three arc-shaped grooves (6) arranged in sequence along the circumferential direction. The three arc-shaped grooves (6) are connected in sequence to form the three gear slots when the reversing shaft (2) is turned. The three arc-shaped grooves (6) are directly opposite the limiting groove (5). The limiting groove (5) and the three On the inner circumferential wall of the assembly hole (4) between the arc-shaped grooves (6), there is a guide rail (7) extending in the circumferential direction. The side of the guide rail (7) facing the outer end of the assembly hole (4) is an inclined surface (701) facing the central axis of the assembly hole (4). The side of the guide rail (7) facing the inner end of the assembly hole is perpendicular to the inner circumferential surface of the assembly hole (4). The reversing shaft (2) is cylindrical. An axially extending limiting protrusion (8) is provided on the outer circumferential surface of the reversing shaft (2). The limiting protrusion (8) extends along the reversing shaft (2). The thickness in the diameter direction matches the depth of the limiting groove (5). The limiting protrusion (8) is used to insert into the limiting groove (5) and slide back and forth along the circumference of the limiting groove (5) to limit the rotation angle range of the reversing shaft (2). A radially extending blind hole (9) is also opened on the outer circumference of the reversing shaft (2). The opening end of the blind hole (9) and the limiting protrusion (8) are respectively located on both sides of the reversing shaft (2). A coil spring (10) and a positioning steel ball (11) are inserted into the blind hole (9). The blind hole (9) corresponds to three arc-shaped grooves (6). The bead (11) is embedded in any arc-shaped groove (6) under the elastic force of the coil spring (10), so that the reversing shaft (2) remains unchanged in posture without external tangential force. The outer circumferential surface of the reversing shaft (2) is also provided with two slots (12) that cooperate with the guide rail (7). The length of the slot (12) along the circumferential direction of the reversing shaft (2) is greater than the length of the guide rail (7), so that the guide rail (7) can slide in the slot (12). The dial (3) is fixedly connected to the end of the reversing shaft (2) opposite to the assembly hole (4).

2. The assembly structure of the disc-type reversing mechanism according to claim 1, characterized in that, The dial (3) is integrally formed with the reversing shaft (2), and a lever (13) is vertically connected to one end edge of the dial (3) opposite to the reversing shaft (2).

3. The assembly structure of the disc-type reversing mechanism according to claim 1, characterized in that, The two inner sides of the slot (12) are parallel to the two outer sides of the guide rail (7), respectively. The end of the reversing shaft inserted into the assembly hole (4) is shaped like a frustum cone. Two axially extending arc-shaped grooves (22) are opened on the end face of the reversing shaft inserted into the assembly hole (4). The two arc-shaped grooves (22) are symmetrically arranged on both sides of the blind hole (9). The two arc-shaped grooves (6) are respectively arranged on the outer wall of the assembly hole (4) corresponding to the arc surface of the two arc-shaped grooves (22).

4. The assembly structure of the disc-type reversing mechanism according to claim 1, characterized in that, Two riveting posts (14) are provided at one end of the reversing shaft (2) facing away from the dial (3). A reversing spring (15) is sleeved on the two riveting posts (14). The reversing spring (15) is riveted to the end of the reversing shaft (2) through the riveting posts (14). The reversing spring (15) is coaxial with the reversing shaft (2).

5. The assembly structure of the disc-type reversing mechanism according to claim 4, characterized in that, A circuit board (16) is fixedly connected inside the housing (1). The circuit board (16) is located inside the mounting hole (4). A reversing copper foil (17) is provided on the circuit board (16). The reversing copper foil (17) is directly opposite the mounting hole (4). The reversing spring (15) elastically abuts against the circuit board (16) to connect the reversing copper foil (17).

6. A brushless signal switch, comprising a housing (1), a circuit board (16) fixedly connected inside the housing (1), a push rod (18) movably inserted into the housing (1), and a sliding spring (19) fixedly connected to the inner end of the push rod (18) and cooperating with the opening and closing copper foil and the resistance adjusting carbon film on the circuit board (16), wherein the inner end of the push rod (18) is also provided with a reset spring (20) for resetting it, and the circuit board (16) is connected with a lead wire harness (21), characterized in that, It also includes the disc-type reversing mechanism assembly structure according to any one of claims 1 to 5, wherein the axial direction of the assembly hole (4) on the housing (1) is perpendicular to the axial direction of the push rod (18), the assembly hole (4) is set on the housing (1) on the side of the circuit board (16) opposite to the push rod (18), and the reversing shaft (2) and the push rod (18) are respectively set on both sides of the circuit board (16).

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