Hand-held power tool main body and hand-held power tool

Abstract

The present invention belongs to the technical field of power tools, and specifically relates to a hand-held power tool main body and a hand-held power tool. The power tool main body comprises: a mounting sleeve; a tool head holder, which is rotatably provided on the mounting sleeve and used for mounting a working component; a working mechanism, which is movably provided on the tool head holder; a pushing mechanism, which is mounted on the mounting sleeve and extends out of the mounting sleeve and is connected to the working mechanism; and a driving mechanism. The pushing mechanism comprises: a screw rod; and a movable sleeve, which is movably sleeved on the outer side of the screw rod and is connected to the working mechanism. The driving mechanism comprises: a speed reducer, which is combined with the screw rod; a motor, which is arranged in an inverted manner beside the mounting sleeve; and a linkage member, which is mounted between the motor and the speed reducer. In the present invention, the motor is arranged in an inverted manner beside the mounting sleeve, and the motor is arranged such that the axis thereof is parallel to the axes of the mounting sleeve and the screw rod, such that the length of the entire tool main body in the vertical direction is reduced, thus making the tool more compact and suitable for more narrow working spaces.

Description

Handheld power tool body and handheld power tool Technical Field

[0001] This invention belongs to the field of power tool technology, specifically relating to a handheld power tool body and a handheld power tool. Background Technology

[0002] Power tools are tools powered by an electric motor that use a transmission mechanism to drive a working head at the front end to perform operations. In pipeline and power construction work, different working heads can be equipped to achieve different functions, such as electric crimping tools, electric pipe expanders, and electric shearing tools. Taking an electric crimping tool as an example, it generally consists of a power supply, a motor drive mechanism, and crimping pliers. The power supply provides power to the motor drive mechanism and controls its activation to drive the crimping pliers to crimp the pipe. Existing power tools are generally divided into two types based on their shape: handheld upright and handheld pistol-style. Handheld upright power tools have a vertically arranged main body with the battery installed at the bottom; the user holds the main body for operation. Pistol-style power tools have a handle arranged perpendicular or at an angle to the main body, resembling a pistol; the user holds the handle for operation. In terms of overall shape, handheld upright power tools are more compact and easier to carry and use.

[0003] The applicant's prior invention patent application CN116810725A discloses a handheld vertical electric crimping tool, which has a lead screw, a reducer connected to the lead screw, and a motor connected to the reducer inside its main body. The lead screw, reducer, and motor are all coaxial and stacked, that is, the center lines of the three are all located on the same vertical line. Furthermore, a controller and a battery pack are arranged sequentially from top to bottom at the bottom of the motor. Therefore, the entire tool is relatively long in the vertical direction, which is not suitable for use in some narrow working environments. Summary of the Invention

[0004] To address the aforementioned problems, the present invention provides a handheld power tool body with the motor inverted next to the mounting sleeve, and a handheld power tool in general, which reduces the length of the tool in the vertical direction to suit narrow working environments.

[0005] The present invention adopts the following technical solution:

[0006] This invention proposes a handheld power tool body, disposed within the handheld power tool, for driving the working parts of the handheld power tool to perform operations. It features the following characteristics: a mounting sleeve; a pliers head seat, rotatably mounted on the mounting sleeve for mounting the working parts; a working mechanism, movably mounted on the pliers head seat for acting on the working parts; a pushing mechanism, mounted on the mounting sleeve and extending beyond the mounting sleeve to connect with the working mechanism, for driving the working mechanism; and a drive mechanism; wherein the pushing mechanism has: a lead screw, rotatably disposed within the mounting sleeve; a movable sleeve, movably sleeved outside the lead screw and connected to the working mechanism; the drive mechanism has: a reducer, coupled with the lead screw; a motor, inverted beside the mounting sleeve; and a linkage component, installed between the motor and the reducer.

[0007] The handheld power tool body proposed in this invention also has the following feature: the pushing mechanism has a drive seat for enclosing the linkage, the drive seat having: a connecting flange containing a first mounting part for mounting a motor and a second mounting part for mounting a reducer; an end cover covering the bottom of the connecting flange; a receiving cavity for accommodating the linkage is formed between the end cover and the connecting flange, the linkage having: a motor output wheel mounted on the motor shaft of the motor; a reducer input wheel connected to the reducer; and an idler wheel connecting the motor output wheel and the reducer input wheel.

[0008] The handheld power tool body proposed in this invention also has the following features: a needle roller bearing is embedded in the middle of the idler wheel, and a mounting shaft is provided in the middle of the needle roller bearing. One end of the mounting shaft is inserted into the connecting flange, and the other end is inserted into the end cover. Gaskets are provided between the two end faces of the idler wheel and the connecting flange and the end cover, respectively.

[0009] The handheld power tool body proposed in this invention also has the following features: the mounting sleeve is fixed on the second mounting part, and it has: a lead screw mounting part for mounting the lead screw, and a speed reduction mounting part integrally formed with the lead screw mounting part for mounting the speed reducer.

[0010] The handheld power tool body proposed in this invention also has the following features: it further includes a sensing component; the lead screw mounting part includes: a guide part with a guide groove on its inner wall that mates with the movable sleeve; and a mounting part with a mounting step inside for mounting the lead screw; the sensing component includes: a sensing element mounted on the end of the movable sleeve away from the working mechanism; and a sensor mounted on the outer wall of the mounting part for mates with the sensing element.

[0011] The handheld power tool body proposed in this invention also has the following features: the working mechanism has: a pair of rollers for acting on the working parts; a roller seat for mounting the pair of rollers; and a movable sleeve having: a push rod, one end of which extends into the mounting sleeve and is sleeved on the outer periphery of the lead screw, and the other end extending out of the mounting sleeve and fixed to the roller seat; and a lead screw nut, which is movably sleeved on the outer periphery of the lead screw and is integrally or separately configured with the end of the push rod away from the roller seat. A sensing element is installed on the outer peripheral surface of the lead screw nut.

[0012] The handheld power tool body proposed in this invention also has the feature that the top of the mounting sleeve is provided with a schematic recess, which is aligned with the sensor in the axial direction.

[0013] The handheld power tool body proposed in this invention also has the following features: when the lead screw nut and push rod are separately arranged, the lead screw nut has a through hole in the middle for the lead screw to pass through, and the end of the push rod away from the roller seat has an extension end that extends into the through hole. The through hole has an action surface for abutting against one end face of the extension end. The inner wall of the through hole is also recessed circumferentially on the side of the action surface to form a groove. A limiting clip is installed in the groove, and the extension end is located between the limiting clip and the action surface. Alternatively, the through hole has a locking hole on the side of the action surface, and a locking pin is provided in the locking hole to connect the movable sleeve to the extension end.

[0014] The handheld power tool body proposed in this invention also has the following feature: a mounting plate is integrally or separately formed at one end of the lead screw near the reducer; a planar thrust bearing is provided between the mounting plate and the mounting step; a deep groove ball bearing is provided on the side of the mounting step away from the planar thrust bearing; and one end of the lead screw passes through the deep groove ball bearing and is combined with the reducer.

[0015] The handheld power tool body proposed in this invention also includes: a housing having an inner cavity for mounting a mounting sleeve; a control switch mounted on the housing; a controller mounted inside the housing and located at the bottom of the drive base; a power supply detachably mounted at the bottom of the housing; and wherein the sensor, control switch, drive motor, and power supply are all electrically connected to the controller.

[0016] The handheld power tool body proposed in this invention also has the following features: one end of the plier head extends into the housing and is threadedly connected to the mounting sleeve, and the other end extends out of the housing. The top of the housing is provided with a central hole for the plier head to extend out. The edge of the central hole extends inward to form a limiting flange. The side of the plier head is provided with a limiting member. The projection of the limiting flange and the limiting member in the axial direction overlaps. Alternatively, the inner wall of the housing is provided with a protruding limiting protrusion. The limiting member can abut against the limiting protrusion during the rotation of the plier head.

[0017] The present invention also proposes a handheld power tool, characterized by comprising: a main body, a working part, detachably mounted on the main body and operating under the drive of the main body, wherein the main body is the handheld power tool body as described above.

[0018] Invention Function and Effect

[0019] According to the present invention, the main body of the handheld power tool is designed so that the motor is inverted next to the mounting sleeve, and the motor, mounting sleeve, and lead screw are arranged parallel to each other. This reduces the vertical length of the entire tool body, making the tool smaller and more suitable for narrower working environments. After the motor is inverted, it is connected to the reducer through a linkage mechanism, which amplifies the torque and transmits it to the lead screw. This achieves high thrust output while improving transmission efficiency, minimizing energy loss, ensuring stable (constant) output force, and increasing reliability.

[0020] Furthermore, the present invention mounts the sensor on the mounting sleeve. When the installation direction of the working part needs to be adjusted by rotating the pliers head (the structure for mounting the working part) during tool use, the sensor mounted on the mounting sleeve will not be affected no matter how the pliers head is rotated, thus protecting the sensor and ensuring that the sensor can be used normally. Attached Figure Description

[0021] Figure 1 is a structural diagram of the handheld power tool of the present invention with the working parts installed on the main body.

[0022] Figure 2 is a cross-sectional view of the main body of the handheld power tool according to Embodiment 1 of the present invention.

[0023] Figure 3 is a cross-sectional view of the motor and reducer installation structure in Embodiment 1 of the present invention.

[0024] Figure 4 is an exploded view of the motor and reducer mounting structure of the present invention.

[0025] Figure 5 is a simplified structural diagram of the lead screw in Embodiment 1 of the present invention.

[0026] Figure 6 is a cross-sectional view of the movable sleeve installation structure of Embodiment 1 of the present invention.

[0027] Figure 7 is a simplified structural diagram of the lead screw nut of the present invention.

[0028] Figure 8 is a simplified structural diagram of the mounting sleeve of the present invention.

[0029] Figure 9 is a cross-sectional view of the installation structure of the clamp head base and the outer shell in Embodiment 1 of the present invention.

[0030] Figure 10 is a cross-sectional view of the lead screw installation structure of Embodiment 3 of the present invention.

[0031] Figure 11 is a cross-sectional view of the installation structure of the clamp head base and the outer shell in Embodiment 4 of the present invention.

[0032] Reference numerals: Main body 10, outer shell 11, center hole 111, limiting flange 112, clamp head seat 12, mounting section 121, limiting element 122, mounting sleeve 13, lead screw mounting part 131, guide part 1311, mounting part 1312, guide groove 1313, mounting step 1314, mounting notch 1315, deceleration mounting part 132, schematic recess 133, positioning groove 134, working mechanism 20, roller seat 21, roller 22, screw 23, pushing mechanism 30, lead screw 31, mounting plate 32, large end 32a, small end 32b, threaded section 311, flat thrust bearing 331, deep groove ball bearing 332, push rod 34, connector 341, extension end 342, lead screw nut 35, through hole 351, mounting groove 352, working surface 353, spiral groove 354, mounting hole 355 356, Reversing device, 357, Slot, 358, Limiting clip, 37, Bearing, 38, Ball bearing, 39, Crimping pliers, 40, Gripper, 41, Notch, 42, Drive mechanism, 50, Motor, 51, Motor shaft, 511, Air inlet, 512, Air outlet, 513, Reducer, 52, First stage internal gear ring, 521, Second and third stage internal gear rings, 522, First stage planetary carrier, 523, First stage planetary gear, 524, Second stage planetary carrier, 525, Second stage planetary gear, 526, Third stage planetary carrier, 527, Third stage planetary gear, 528, Motor output wheel, 53, Reducer input wheel, 54, Idler wheel, 55, Mounting shaft, 551, Needle roller bearing, 552, Gasket, 553, Drive seat, 561, Connecting flange, First mounting part, 5611, Second mounting part, 5612, End cover, 562, Sensing component, 60, Sensing element, 61, Sensor, 62, Screw, 621. Detailed Implementation

[0033] To make the technical means, creative features, objectives and effects of the present invention easy to understand, the following describes the main body of the handheld power tool and the handheld power tool in detail with reference to the embodiments and accompanying drawings.

[0034] <Example 1>

[0035] This embodiment proposes a handheld power tool, which includes a main body 10 and a working part, as shown in Figure 1. The main body 10 is a handheld power tool body, and the working part is a crimping pliers 40 (which can also be a shearing pliers, a clamp, etc.). The crimping pliers 40 is detachably installed at the front end of the main body 10 and can perform crimping workpieces such as pipes under the drive of the main body 10.

[0036] As shown in Figures 1 and 2, the main body 10 includes at least a housing 11 (not shown in the figures), a clamp head seat 12 for mounting the crimping clamp 40, a mounting sleeve 13, a working mechanism 20 acting on the crimping clamp 40, a pushing mechanism 30 for driving the working mechanism 20, a drive mechanism 50 for controlling the pushing mechanism 30, a controller, a sensing component 60, a power supply, a control switch, and a button. In this embodiment, the housing 11 is a vertically extending shell formed by two front and rear half-shells fixed together by screws. It is hollow inside and used to mount the mounting sleeve 13 and the drive mechanism 50. The clamp head seat 12 is mounted at the front end (which can be the top) of the housing 11, and the controller is mounted at the rear end (which can be the bottom). The power supply is detachably mounted on the housing 11 and is located at the bottom of the controller. The button is located on the housing 11. A control switch (such as a microswitch) is installed inside the housing 11. The control switch and the controller are electrically connected via wires. Pressing the button activates the internal control switch (the connection between the control switch, button, and controller is prior art and will not be described in detail here).

[0037] Arranged vertically from top to bottom are: a working mechanism 20, a pushing mechanism 30, a driving mechanism 50, a controller, and a power supply. The working mechanism 20 has a pair of rollers 22 acting on the crimping pliers 40 and roller seats 21 for mounting the rollers 22. The roller seats 21 and the pair of rollers 22 are mounted within the pliers head seat 12, and the roller seats 21 can move along the axial direction of the pliers head seat 12 with the pair of rollers 22 under the action of the pushing mechanism 30. The crimping pliers 40 has a pair of symmetrically arranged jaws 41. A notch 42 for clamping the workpiece is formed between the front ends of the jaws 41, and the tail ends of the jaws 41 correspond to the pair of rollers 22. The jaws 41 can rotate under the push of the pair of rollers 22, thereby crimping the workpiece within the notch 42. One end of the pliers head seat 12 extends into the housing 11 and is provided with a mounting section 121 for rotatably connecting with the mounting sleeve 13, while the other end extends out of the housing 11 and is detachably connected to the crimping pliers 40, making it convenient to disassemble and replace the crimping pliers 40.

[0038] The pushing mechanism 30 is mounted on the mounting sleeve 13, and its front end extends out of the mounting sleeve 13 and connects to the roller seat 21 of the working mechanism 20. Specifically, as shown in Figure 3, the pushing mechanism 30 includes a lead screw 31 and a movable sleeve sleeved on the outside of the lead screw 31 for moving the roller seat 21. The lead screw 31 is mounted inside the mounting sleeve 13 and can rotate under the drive of the driving mechanism 50. The lead screw 31 has a threaded section 311 formed on its outer circumference, and the movable sleeve is sleeved on the threaded section 311. During the rotation of the lead screw 31, the movable sleeve moves axially along the lead screw 31 under the action of the threaded section 311. The outer end of the movable sleeve extends out of the mounting sleeve 13 and is fixed to the roller seat 21. During the axial movement, the movable sleeve drives the roller seat 21 and the roller 22 to move and roll axially, thereby realizing the operation of the crimping pliers 40.

[0039] The drive mechanism 50 includes a motor 51, a reducer 52, a linkage, and a drive seat 56 for mounting the motor 51 and the linkage. The reducer 52 is installed inside the mounting sleeve 13. One end of the reducer 52 is connected to the lead screw 31, and the other end is connected to the motor 51 via the linkage. The motor 51 is electrically connected to a controller, which controls the motor 51 to operate. The lead screw 31 rotates under the drive of the motor 51 and the reducer 52. Specifically, as shown in Figure 2, the motor 51 is inverted beside the mounting sleeve 13, and the axis of the motor 51 is parallel to the axis of the mounting sleeve 13 (or the lead screw 31). As shown in Figures 3 and 4, the linkage includes a motor output wheel 53 mounted on the motor shaft 511 of the motor 51, a reducer input wheel 54 connected to the reducer 52, and an idler wheel 55 connecting the motor output wheel 53 and the reducer input wheel 54. The drive base 56 has a connecting flange 561 and an end cover 562 fixed by screws. The connecting flange 561 has a first mounting portion 5611 for mounting the motor 51 and a second mounting portion 5612 for mounting the reducer 52 (or mounting sleeve 13). The end cover 562 covers the bottom of the connecting flange 561, and a receiving cavity for accommodating the linkage is formed between the end cover 562 and the connecting flange 561. The motor output wheel 53 is a gear, and the reducer input wheel 54 is a first-stage sun gear. The middle part of the reducer input wheel 54 extends towards the reducer 52 to form an output end 541. The output end 541 passes through the second mounting part 5612 to form an output gear and connects with the reducer 52. A bearing 542 is provided between the output end 541 and the second mounting part 5612. A central through hole is axially opened in the middle of the reducer input wheel 54. A rotating shaft 543 is installed at the bottom of the central through hole. The upper end of the rotating shaft 541 is inserted into the central through hole, and the lower end is inserted into the end cover 562. A bearing 542 is provided between the rotating shaft 541 and the end cover 562.

[0040] The first mounting part 5611 has a hole in the middle for the motor shaft 511 to pass through. After passing through the hole, the motor shaft 511 extends into the receiving cavity and is equipped with a motor output wheel 53. The second mounting part 5612 has a mounting sleeve 13 fixed above it by screws. The second mounting part 5612 also has a hole in the middle for the main shaft of the reducer input wheel 54 to pass through. After passing through the hole, the main shaft of the reducer input wheel 54 is inserted into the reducer 52. The idler wheel 55 is mounted between the motor output wheel 53 and the reducer input wheel 54 via the mounting shaft 551. The two sides of the idler wheel 55 are respectively engaged with the motor output wheel 53 and the reducer input wheel 54. One end of the mounting shaft 551 is inserted into the connecting flange 561 (located between the first mounting part 5611 and the second mounting part 5612), and the other end is inserted into the end cover 562. A needle roller bearing 552 is also provided between the outer periphery of the mounting shaft 551 and the center hole of the idler wheel 55. Gaskets 553 are provided between the two end faces of the idler wheel 55 and the connecting flange 561 and the end cover 562 respectively to prevent contact wear between the idler wheel 55 and the connecting flange 561 and the end cover 562.

[0041] In this embodiment, as shown in Figures 2 and 8, the mounting sleeve 13 is an integral sleeve structure with a lead screw mounting part 131 and a reduction gear mounting part 132. The lead screw mounting part 131 is used to install the lead screw 31, and the reduction gear mounting part 132 is integrally set with the lead screw mounting part 131 and is used to install the reducer 52. That is to say, the gearbox housing for installing the reducer 52 and the mounting housing for installing the lead screw 31 are made into an integral structure, which greatly simplifies the installation structure, reduces costs, and makes the structure more compact and stable, which is conducive to product miniaturization and weight reduction. In addition, the bottom of the mounting sleeve 13 is mounted on the connecting flange 561 of the drive seat 56. The mounting sleeve 13 encloses the lead screw 31 and the reducer 52 inside, and the drive seat 56 encloses the linkage inside. The relatively enclosed structure allows the tool to ensure reliable operation even in relatively harsh pipeline construction environments with dust, mud, sand and metal shavings. Meanwhile, the gears and bearings inside the drive housing 56 are lubricated with grease, and the drive housing 56 forms a closed space, so the grease is not easy to leak out, thus ensuring the lubrication conditions of the gear transmission parts.

[0042] In this embodiment, the control motor 51 is a sensorless brushless motor. Compared to traditional sensored motors (with Hall effect sensors), sensorless brushless motors reduce wiring and components. In high-power handheld power tools, where heat easily affects electrical components, sensorless brushless motors have a longer lifespan. As shown in Figure 3, the reducer 52 is a three-stage planetary structure. This three-stage planetary structure is installed in the reduction mounting part 132 of the mounting sleeve 13. The three-stage planetary structure includes a first-stage internal gear ring 521, second and third-stage internal gear rings 522, a first-stage planetary carrier 523, a first-stage planetary gear 524, a second-stage planetary carrier 525, a second-stage planetary gear 526, a third-stage planetary carrier 527, and a third-stage planetary gear 528. The first-stage internal gear ring 521 and the second and third-stage internal gear rings 522 are stacked and tightly mounted against the inner wall of the reduction mounting part 132. The first-stage planetary gear 524 has multiple... The first-stage planetary gears 524 are mounted on the first-stage planetary carrier 523 and mesh with the output gear on the output end 541 of the input wheel 54 of the reducer. The second-stage planetary gears 526 are multiple and are mounted on the second-stage planetary carrier 525 and mesh with the first-stage planetary carrier 523. The third-stage planetary gears 528 are multiple and are mounted on the third-stage planetary carrier 527 and mesh with the second-stage planetary carrier 525. The third-stage planetary carrier 527 has a hole in the middle for the lower end of the lead screw 31 to be inserted. The lower end of the lead screw 31 is inserted into the middle of the third-stage planetary carrier 527.

[0043] In this embodiment, the motor 51 is inverted and positioned beside the mounting sleeve 13, significantly shortening the overall length of the main body. This reduces the vertical length of the tool body, making the tool smaller and more adaptable to narrower working environments. With the motor 51 inverted, it is connected to the reducer 52 via a linkage (motor output wheel 53, idler wheel 55, and reducer input wheel 54). Under the action of this linkage, the torque is amplified and transmitted to the lead screw, achieving high thrust output while improving transmission efficiency, minimizing energy loss, ensuring stable (constant) output force, and enhancing reliability.

[0044] Furthermore, when the motor 51 is inverted, as shown in Figure 1, the air inlet 512 is located at the top and the air outlet 513 is located at the bottom. This allows for simultaneous heat dissipation of the motor 51, the linkage, the side reducer 52, and the controller located at the bottom, improving the heat dissipation and cooling effect. This solves the problem of tool overheating during continuous operation and greatly extends the continuous working time of the tool (in the past, the motor, lead screw, and reducer were arranged vertically with the air outlet located at the top, resulting in poor heat dissipation, especially for the controller located at the bottom of the motor, which could hardly assist in heat dissipation. Therefore, the continuous working time of the tool was limited, and it had to be stopped after working for a certain period of time to wait for it to cool down before working again).

[0045] The screw mounting part 131 of the mounting sleeve 13 includes a guide part 1311 and a mounting part 1312. The guide part 1311 is located at the end of the mounting part 1312 away from the deceleration mounting part 132, and its inner wall is provided with several guide grooves 1313 that cooperate with the movable sleeve. The mounting part 1312 is provided with a mounting step 1314 for mounting the screw 31 near the deceleration mounting part 132. The screw 31 is provided with a mounting plate 32 integrally or separately on the end near the reducer 52 (as shown in Figure 2 or Figure 3, the mounting plate 32 is integrally set with the screw 31, which is less prone to errors and wear during installation). A planar thrust bearing 331 (also called a planar needle roller bearing) is provided between the mounting plate 32 and the mounting step 1314. A deep groove ball bearing 332 is provided on the side of the mounting step 1314 away from the planar thrust bearing 331. One end of the screw 31 passes through the deep groove ball bearing 332 (also called a ball bearing) and is combined with the reducer 52. The use of a planar thrust bearing 331 not only allows for stable installation between the lead screw 31 and the mounting part 1312 when it is matched with a deep groove ball bearing 332, but also counteracts the recoil force in the axial direction of the lead screw 31, making the lead screw 31 more stable under force and protecting the lead screw 31.

[0046] The sensing component 60 is installed between the mounting sleeve 13 and the movable sleeve, and includes a sensing element 61 and a sensor 62. The movable sleeve includes a push rod 34 and a lead screw nut 35, which are either integrally set or separately combined. The sensing element 61 is installed on the lead screw nut 35, and the sensor 62 is installed on the mounting portion 1312 of the mounting sleeve 13. In this embodiment, the movable sleeve is set separately, as shown in Figure 6. The lead screw nut 35 has a through hole 351 in the middle for the lead screw 31 to pass through. The sensing element 61 is installed on the outer circumference near the bottom. The lead screw nut 35 is located at one end of the push rod 34. The push rod 34 has a structure with one end closed and the other end open. The closed end forms a connector 341, as shown in Figure 2. The connector 341 extends out of the mounting sleeve 13 and is fixed to the roller seat 21 by a screw 23, thereby realizing the connection between the push rod 34 and the roller seat 21. The push rod 34 is hollow inside, and the open end is sleeved on the outside of the end of the lead screw 31 away from the reducer 52.

[0047] As shown in Figure 6, the open end of the push rod 34 extends into the through hole 351 of the lead screw nut 35, forming an insertion end 342. This insertion end 342 is an annular boss structure. The push rod 34 is connected to the lead screw nut 35 through this annular boss structure. The lead screw nut 35 is located at the end of the push rod 34 (i.e., the lead screw nut 35 is located at the end of the push rod 34 away from the roller seat 21). During the rotation of the lead screw 31, the push rod 34 can drive the roller seat 21 to move, thereby causing the roller 22 to push the crimping clamp 40 to work. During the movement, the roller 22 will contact the inner end of the clamp 41. Under the pushing force of the roller 22, the clamp 41 will rotate around the central axis, thereby causing the crimping clamp 40 to close and crimp the workpiece. Since the structure and principle of using a roller to drive the crimping clamp is existing technology, it will not be described in detail here.

[0048] As shown in Figure 6, a mounting groove 352 is provided at one end of the through hole 351 of the lead screw nut 35 near the push rod 34. The bottom of the mounting groove 352 forms an annular working surface 353, which abuts against the lower end face of the extension end 342 of the push rod 34. The two interact, allowing the lead screw nut 35 to push the push rod 34 towards the roller seat 21 under the action of the lead screw 31. The specific installation structure of the lead screw nut 35 and the push rod 34 is as follows: a groove 357 is formed by a circumferential recess on one side of the working surface 353 on the inner wall of the through hole 351. A limiting member 37 is installed in the groove 357, which connects the lead screw nut 35 and the push rod 34, thereby placing the extension end 342 between the limiting member 37 and the working surface 353.

[0049] The push rod 34 has two directions of movement: one is the direction that pushes the roller seat 21 toward the crimping clamp 40, called the pushing direction; the other is the opposite direction, called the retraction direction. As shown in Figure 5, the push rod 34 moves in the pushing direction by the action surface 353 of the screw nut 35 acting on the lower end face of the extension end 342 of the push rod 34, which has the characteristic of high load-bearing capacity and is easy to bear the large pushing force during operation; the push rod 34 moves in the retraction direction by the end structure of the screw nut 35 and the limiting clip 37 acting on the extension end 342 to pull back, at which time the force is relatively small and it is not easy to affect the life of the limiting clip 37.

[0050] As shown in Figures 6 and 7, the inner wall of the through hole 351 is provided with a spiral groove 354 that mates with the threaded section 311 on the surface of the lead screw 31. A ball bearing 39 is positioned between the spiral groove 354 and the threaded section 311. An installation hole 355 is provided on the lead screw nut 35 for mounting a reversing device 356, forming an internal circulation ball screw structure with the lead screw 31. The outer periphery of the lead screw nut 35 is also provided with a slide bar 358 (which can also be a spline tooth structure). A guide groove 1313 (which can also be a spline groove structure that mates with spline teeth) on the inner wall of the guide portion 1311 can mate with the slide bar 358, allowing the lead screw nut 35 to move smoothly axially along the inner wall of the guide portion 1311 of the mounting sleeve 13, providing good guidance and stability.

[0051] A sensing element 61 is mounted on the circumferential surface of the lead screw nut 35 near the sensor 52. The sensing element 61 is preferably a sensing magnet, and the sensor 62 is preferably a Hall sensor. The sensor 62 is mounted on the mounting part 1312 of the mounting sleeve 13 to sense the position of the sensing magnet and is electrically connected to the controller via a wire 63. The sensor 62 transmits signals to the controller.

[0052] As shown in Figure 8, the mounting sleeve 13 is installed inside the housing 11. A mounting recess 1315 is formed on the outer circumferential surface of the mounting portion 1312, and the sensor 62 is fixed within this recess 1315 by screws 621. In this embodiment, the mounting recess 1315 is shaped like a racetrack, and the sensor 62 is embedded. To facilitate sensing between the sensor 62 and the sensing element 61 and improve sensing accuracy, the sensing element 61 is installed on the circumferential surface of the lead screw nut 35 near the bottom, corresponding to the location of the sensor 62. Installing the sensor 62 on the mounting sleeve 13 allows it to be closer to the controller. Furthermore, since the mounting sleeve 13 is built into the housing 11 and remains relatively fixed relative to it, adjusting the working angle of the pressure connector during use will not affect the sensor 62, thus ensuring its normal operation. The mounting sleeve 13 has a positioning groove 134 formed by an inward recess on its outer circumference at the connection between the lead screw mounting portion 131 and the deceleration mounting portion 132, used for positioning and installation within the housing.

[0053] The top end face of the mounting sleeve 13 is provided with an indication recess 133 corresponding to the sensor 62. The indication recess 133 is aligned with the sensor 62 in the axial direction. The indication recess 1316 is provided to indicate the installation position of the sensing element 61 during assembly. The sensing element 61 is aligned with the indication recess 133 before being installed into the mounting sleeve 13, so that the sensing element 61 is directly facing the sensor 62 after installation, ensuring the accuracy of sensing.

[0054] The sensing element 61 has an initial zero position, a pipe crimping completion position, and a full stroke position as it moves with the lead screw nut 35. During operation, the motor 51 rotates forward, driving the lead screw 31 to rotate, causing the lead screw nut 35 to move with the sensing element 61 from the initial zero position. At the same time, the lead screw nut 35 pushes the push rod 34 forward, and the roller seat 21 on the push rod 34 moves the roller 22 towards the crimping clamp. When it contacts the crimping clamp, the crimping clamp begins to rotate and close under the action of the roller 22. During the closing process, the pipe is crimped until the crimping clamp is fully closed. At this time, the sensing element 61 moves to the pipe crimping completion position. At the same time, the motor pauses for a period of time, and then the motor 51 reverses, causing the lead screw 31 to reverse, so that the lead screw nut 35 and the sensing element 61 return from the pipe crimping completion position to the initial zero position, completing one operation. When the crimping pliers 40 are not installed on the pliers head holder 12, starting the motor allows the roller holder 21 to move forward without obstruction, carrying the roller 22. This completes a full stroke, meaning the sensor 61 reaches its full stroke position. The full stroke position is where the sensor 61 has moved to its set maximum stroke. Normally, the stroke from the initial zero position to the completed crimping position is less than the maximum stroke.

[0055] Sensor 62 is used to sense the position of sensing element 61. When the tool is started, if sensing element 61 is not at the initial zero position, motor 51 will first reverse to make lead screw nut 35 carry sensing element 61 back to the initial zero position. Then motor 51 will rotate forward to control the roller to extend, causing the crimping clamp to gradually close and crimp the workpiece.

[0056] The mounting sleeve 13 is located on the outside of the lead screw 31, push rod 34, and lead screw nut 35. Its end is connected to the pliers head seat 12. The end of the mounting sleeve 13 near the roller seat 21 is threadedly connected to the mounting section 121 of the pliers head seat 12. The interior of the mounting sleeve 13 is hollow, which encloses the lead screw 31 and lead screw nut 35 inside the mounting sleeve 13. A gap is formed between the inner wall of the mounting sleeve 13 and the outer wall of the lead screw 31 for the push rod 34 and lead screw nut 35 to move, so that the push rod 34, lead screw nut 35 and mounting sleeve 13 form a relatively sealed space. The lead screw 31 is located in this sealed space, which further seals and protects the lead screw 31, preventing dust and impurities from entering and affecting the accuracy of the lead screw.

[0057] As shown in Figure 2, a bearing 38 is also fitted at one end of the lead screw 31 inside the push rod 34. The bearing 38 is fixed to the lead screw 31 by a snap ring. The bearing 38 is located between the top of the lead screw 31 and the inner wall of the push rod 34. This not only makes the rotation of the lead screw 31 more stable, but also limits the stroke of the lead screw nut 35, preventing the lead screw nut 35 from detaching from the lead screw 31, thus making the structure more stable.

[0058] As shown in Figure 9, one end of the plier head seat 12 (mounting section 121) extends into the housing 11 and is threadedly connected to the top of the mounting sleeve 13. The other end extends out of the housing 11 for mounting the crimping pliers 21. A limiting member 122 (which can be a screw) is provided on the peripheral side of the plier head seat 12. The limiting member 122 has a limiting head protruding from the outer peripheral surface of the plier head seat 12. A protruding limiting protrusion 113 is provided on the inner wall of the housing 11. The limiting head on the limiting member 122 can abut against the limiting protrusion 113 during the rotation of the plier head seat 12, thereby limiting the rotation angle of the plier head seat 12. The limiting protrusion 113 and the limiting member 122 are almost at the same height. The number of limiting protrusions 113 corresponds to the rotation angle of the pliers head seat 12. For example, when one limiting protrusion 113 is provided, the pliers head seat 12 can rotate at an angle close to 360° (in reality, because the limiting protrusion 113 itself has a certain width, the rotation angle is actually less than 360°); or as shown in Figure 9, two limiting protrusions 113 are arranged, in which case the pliers head seat 12 can rotate at an angle of approximately 180°. Therefore, the number of limiting protrusions 113 can be set according to the actual rotation angle required by the pliers head seat 12.

[0059] <Example 2>

[0060] Based on Embodiment 1 above, as shown in Figure 8, the mounting recess 1315 for mounting the sensor 62, which is opened in the middle of the mounting sleeve 13, has a shape with one end being semi-circular and the other end being straight. The design of different shapes at both ends can prevent incorrect installation during installation.

[0061] <Example 3>

[0062] This embodiment is basically the same as embodiments 1 and 2 above, except that in embodiments 1 and 2, the lead screw 31 and its mounting plate 32 are integrally formed. However, in this embodiment, as shown in Figure 10, the mounting plate 32 is separately fitted onto the outer periphery of the lead screw 31 above the mounting step 1314 of the mounting sleeve 13. The mounting plate 32 has a "convex" shaped cross-section, with a large end 32a and a small end 32b with a smaller outer diameter. A planar thrust bearing 331 is provided between the outer periphery of the small end 32b and the inner wall of the mounting sleeve 13. The separate structure facilitates disassembly and replacement, and results in less waste and lower cost during processing.

[0063] <Example 4>

[0064] This embodiment is basically the same as embodiments 1-3 above, except for the limiting structure during the rotation of the pliers head seat 12, as shown in Figure 11. One end of the pliers head seat 12 (mounting section 121) extends into the outer shell 11 and is threadedly connected to the top of the mounting sleeve 13. The other end extends out of the outer shell 11 for mounting the crimping pliers 21. The top of the outer shell 11 is provided with a central hole 111 for the pliers head seat 12 to extend out. The edge of the central hole 111 extends inward to form a limiting flange 112. The peripheral side of the pliers head seat 12 is provided with a limiting member 122 (which can be a screw). The projections of the limiting flange 112 and the limiting member 122 in the axial direction overlap. Since the pliers head seat 12 and the mounting sleeve 13 are threadedly connected, the pliers head seat 12 will move axially relative to the mounting sleeve 13 when the pliers head seat 12 is rotated. The cooperation between the limiting flange 112 and the limiting member 122 can prevent the pliers head seat 12 from disengaging due to rotation. The limiting member 122 is installed close to the limiting protrusion 112. The closer the distance between the limiting member 122 and the limiting protrusion 112, the smaller the angle (or the fewer turns) that the clamp head seat 12 can rotate.

[0065] Functions and effects of the examples:

[0066] According to the handheld power tool and main body of the above embodiment, the motor 51 is inverted and placed next to the mounting sleeve 13, which significantly shortens the overall length of the main body, reducing the vertical length of the tool body and making the tool smaller to adapt to more confined working environments. After the motor 51 is inverted, it is connected to the reducer 52 through the linkage (motor output wheel 53, idler wheel 55, and reducer input wheel 54). Under the action of the linkage, the torque can be amplified and transmitted to the lead screw, achieving high thrust output while improving transmission efficiency, minimizing energy loss, ensuring stable (constant) output force, and increasing reliability. In addition, after the motor 51 is inverted, the air inlet 512 is located at the top and the air outlet 513 is located at the bottom, which can simultaneously dissipate heat from the motor 51, the linkage, the reducer 52 on the side, and the controller located at the bottom, improving the heat dissipation and cooling effect, solving the problem of tool overheating during continuous operation, and greatly extending the continuous working time of the tool.

[0067] Furthermore, since the sensor 62 is mounted on the mounting sleeve 13 and the corresponding sensing element 61 is mounted on the lead screw nut 34, when the tool needs to be used to adjust the installation direction of the working part by rotating the pliers head seat 12 (the structure used to install the working part), no matter how the pliers head seat 12 rotates, it will not affect the sensor 62 mounted on the mounting sleeve 13 (that is, the wire connecting the sensor 62 to the controller will not be tangled or broken due to rotation), thus protecting the sensor 62 and ensuring that the sensor 62 can be used normally.

[0068] Furthermore, the integrated design of the mounting sleeve 13 for mounting the lead screw 31 and the reducer 52 eliminates the need for a separate reducer 52 housing, simplifying the structure, reducing costs, and making the entire lead screw 31 rotation structure more stable.

[0069] Furthermore, since the lead screw 31 is located inside the housing 11, and the push rod 34 and the lead screw nut 35 are sleeved on the outer periphery of the lead screw 31, a relatively sealed space is formed inside the guide sleeve on the circumferential surface, which can prevent dust from entering and affecting the lead screw 31, thus protecting the lead screw 31.

[0070] Furthermore, since the hardness required for the push rod 34 in actual operation is less than that of the lead screw nut 35, the push rod 34 and the lead screw nut 35 are set separately in the above embodiment, and different hardness materials are selected for the two, which can reduce costs and requirements to a certain extent.

[0071] Furthermore, since the control motor uses a sensorless brushless motor 51, compared to using a traditional sensored motor (with Hall element), the wiring layout and components are reduced. In high-power handheld power tools, where heat can easily affect electrical components, the sensorless brushless motor has a longer lifespan.

[0072] The above embodiments are merely illustrative of specific implementations of the present invention, and the present invention is not limited to the scope of the description of the above embodiments. For example, in the cases provided in the above embodiments, the push rod and the lead screw nut are separately configured; in actual situations, the push rod and the lead screw nut can also be integrally configured. In the cases provided in the above embodiments, the working component is a crimping pliers; in actual situations, it can also be replaced with a shearing head, a caliper combined with a ring die, or other working components, i.e., the working components can be replaced according to different working environments and requirements.

Claims

1. A hand-held power tool body provided in a hand-held power tool for driving a working member of the hand-held power tool to work, characterized by, include: Install sleeve; A clamp head seat is rotatably mounted on the mounting sleeve for mounting the working part; The working mechanism is movably mounted on the clamp head seat and is used to act on the working part; A driving mechanism, mounted on the mounting sleeve and extending beyond the mounting sleeve to connect with the working mechanism, is used to drive the working mechanism to move; and Drive mechanism; The driving mechanism has the following features: The lead screw is rotatably mounted inside the mounting sleeve; A movable sleeve is provided on the outside of the lead screw and is connected to the working mechanism; The drive mechanism has: The speed reducer is combined with the lead screw; The motor is inverted beside the mounting sleeve; and A linkage component is installed between the motor and the reducer.

2. The hand-held power tool body of claim 1, wherein, The drive mechanism further includes a drive seat for enclosing the linkage, the drive seat having: The connecting flange includes a first mounting portion for mounting the motor and a second mounting portion for mounting the reducer; End cap, which covers the bottom of the connecting flange; A receiving cavity for accommodating the linkage is formed between the end cap and the connecting flange, the linkage having: The motor output wheel is mounted on the motor shaft of the motor; The reducer input wheel is connected to the reducer, and An idler wheel connects the motor output wheel to the reducer input wheel.

3. The hand-held power tool body of claim 2, wherein, The idler wheel is fitted with a needle roller bearing in the middle, and the needle roller bearing is provided with a mounting shaft in the middle. One end of the mounting shaft is inserted into the connecting flange, and the other end is inserted into the end cover. Gaskets are provided between the two end faces of the idler wheel and the connecting flange and the end cover, respectively.

4. The hand-held power tool body of claim 2, wherein, It also includes a sensing component, wherein the mounting sleeve is fixed to the second mounting portion and has: Lead screw mounting part, used to mount the lead screw. The speed reduction mounting part is integrally formed with the lead screw mounting part and is used to mount the speed reducer; The lead screw mounting part includes: The guide section has a guide groove on its inner wall that mates with the movable sleeve. The mounting section has an internal mounting step for mounting the lead screw; The sensing component has: The sensor is installed at the end of the movable sleeve furthest from the working mechanism. A sensor is mounted on the outer wall of the mounting portion for use with the sensing element.

5. The hand-held power tool body of claim 4, wherein, The working mechanism has: A pair of rollers, for action on the working part, Roller seat, for mounting the pair of rollers, The active sleeve has: The push rod has one end inserted into the mounting sleeve and fitted around the outer circumference of the lead screw, and the other end extending out of the mounting sleeve and fixed to the roller seat. The lead screw nut is movably sleeved on the outer circumference of the lead screw, and is either integrally formed with or separate from the end of the push rod away from the roller seat. The sensing element is installed on the outer peripheral surface of the lead screw nut.

6. The hand-held power tool body of claim 4, wherein, The top of the mounting sleeve is provided with a schematic recess, which is aligned with the sensor in the axial direction.

7. The hand-held power tool body of claim 5, wherein, When the lead screw nut and the push rod are separately set, the lead screw nut has a through hole in the middle for the lead screw to pass through, and the end of the push rod away from the roller seat has an extension end that extends into the through hole. The through hole has a working surface for abutting against one end face of the extension end. The inner wall of the through hole is also recessed circumferentially on one side of the working surface to form a groove, in which a limiting device is installed, and the extended end is located between the limiting device and the working surface. Alternatively, a locking hole is provided on one side of the working surface of the through hole, and a locking pin is provided in the locking hole, through which the movable sleeve is connected to the inserted end.

8. The hand-held power tool body of claim 7, wherein, The lead screw has an integral or separate mounting plate at one end near the reducer. A planar thrust bearing is provided between the mounting plate and the mounting step. A deep groove ball bearing is provided on the side of the mounting step away from the planar thrust bearing. One end of the lead screw passes through the deep groove ball bearing and is connected to the reducer.

9. The hand-held power tool body of any of claims 1-8, wherein, It also includes a housing, in which the mounting sleeve is installed. One end of the pliers head extends into the housing and is rotatably connected to the mounting sleeve, while the other end extends out of the housing. A limiting member is provided on the side of the pliers head. The top of the housing is provided with a central hole for the pliers head to extend out, and the edge of the central hole extends inward to form a limiting protrusion. The limiting protrusion and the projection of the limiting member in the axial direction have an overlapping portion. Alternatively, the inner wall of the outer shell is provided with a protruding limiting protrusion, and the limiting member can abut against the limiting protrusion as it rotates with the clamp head seat.

10. A hand-held power tool, characterized in that include: main body, The working component is detachably mounted on the main body and operates under the drive of the main body. The main body is the handheld power tool body as described in any one of claims 1-9.

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