Screwdriver structure

Abstract

The utility model discloses a screwdriver structure which comprises a shell, a motor and a battery are arranged in the shell, a speed reduction transmission device connected with the motor is further arranged in the shell, and the speed reduction transmission device comprises a transmission piece body synchronously rotating with the motor. The head of the shell is provided with an output shaft rotationally connected with the head of the shell, the output shaft is connected with the transmission part body, and an impact assembly is arranged between the output shaft and the transmission part body. The impact assembly comprises a striking block and a hammer body, and the striking block can stretch out and draw back relative to the transmission part body; a fixing assembly is arranged between the output shaft and the shell and comprises a fixing base, and the fixing base is connected with the hammer body and the output shaft. The output shaft is axially and radially limited through the fixing assembly, the hammer body and the output shaft are connected together, and the rotation process of the output shaft is more stable and reliable.

Description

TECHNICAL FIELD

[0001] The utility model belongs to electric tool technical field, concretely relates to a screwdriver structure. BACKGROUND

[0002] The screwdriver is a kind of household tool, it has the advantages such as fast and light, cheap and practical, widely applicable crowd etc. The patent document with the existing publication number CN219704922U discloses a kind of beating assembly for electric wrench, including head shell, intermediate cover and output shaft, transmission shaft is equipped between head shell and intermediate cover, transmission shaft end is equipped with impact block, and elastic member is equipped between impact block and intermediate cover;The bottom of intermediate cover is equipped with two-stage speed reduction transmission mechanism, two-stage speed reduction transmission mechanism includes first stage planetary gear assembly, second stage planetary gear assembly, inner tooth ring and speed reducer motor, first stage planetary gear assembly and second stage planetary gear assembly are arranged in inner tooth ring, first stage planetary gear assembly is connected speed reducer motor, and second stage planetary gear assembly is connected transmission shaft;Limiting assembly is equipped between output shaft and head shell, and limiting assembly includes first gasket and shaft sleeve, and shaft sleeve is arranged between output shaft and head shell. The output shaft of existing beating assembly and hammer body are integrally formed, and output shaft is only limited by limiting assembly;The limiting effect of output shaft is poor, so as to cause the rotation process of output shaft to be not enough stable. While the output shaft and hammer body are integrally formed, output shaft is prone to jamming when working, and the working process is not safe and reliable. Therefore, a kind of screwdriver structure is needed to overcome the above difficulties. SUMMARY

[0003] The utility model discloses in view of prior art existing problem, designs a kind of screwdriver structure, the utility model is limited by fixed assembly to the axial and radial location of output shaft, simultaneously, hammer body and output shaft are connected together, and the rotation process of output shaft is more stable and reliable.

[0004] The utility model discloses a kind of screwdriver structure, including shell, motor and battery are equipped in shell, the speed reduction transmission device connected with motor is also equipped in shell, and the transmission member body is synchronously rotated with motor in speed reduction transmission device;The head of shell is equipped with the output shaft being rotationally connected with it, and the transmission member body is connected with the output shaft, and impact assembly is equipped between the transmission member body and the output shaft;The impact assembly includes impact block and hammer body, and the impact block can be telescopic relative to transmission member body;Fixed assembly is equipped between the output shaft and shell, and the fixed assembly includes fixed seat, and the fixed seat is connected the hammer body and output shaft.

[0005] As preferred, the speed reduction transmission device further includes planetary speed reduction assembly, the transmission member body is installed on planetary speed reduction assembly and is engaged with each other;The transmission member body is connected motor, and the motor is rotated when driving transmission member body;The transmission member body outer layer is equipped with impact assembly.

[0006] As preferred, the impact assembly further comprises a first elastic member, the transmission member body comprises a mounting base and a transmission shaft; the mounting base is connected with the planetary reduction assembly, the transmission shaft and the mounting base are integrally formed; the transmission shaft is sleeved with the striking block and the first elastic member, one end of the first elastic member abuts against the mounting base, and the other end of the first elastic member abuts against the striking block; the hammer body is sleeved on the output shaft, and the hammer body rotates synchronously with the output shaft.

[0007] As preferred, the end face of the striking block towards the output shaft is provided with a pair of first protrusions, and the hammer body is provided with a pair of transverse feet; each of the transverse feet is arranged in one-to-one correspondence with each of the first protrusions; the side surface of the first protrusion and the side surface of the transverse foot are arranged in abutment in the default state.

[0008] The motor drives the transmission member body to rotate, and the transmission member body and the motor realize speed ratio conversion through the planetary reduction assembly, so that the output torque of the output shaft is larger; the transmission member body drives the output shaft to rotate synchronously, and the output shaft is provided with a working head, so that the screw can be driven through the working head. The working head is not shown in the drawings. In the default state, the transmission shaft drives the output shaft and the hammer body to rotate synchronously; when the screw is initially driven, the screw is not tightened, and the torque on the output shaft is smaller; at this time, the side surface of the first protrusion and the side surface of the transverse foot are in abutment, the striking block and the hammer body rotate synchronously, and the striking block will not impact the hammer body; when the screw is about to be tightened, the torque on the output shaft is larger; at this time, the striking block will overcome the elastic force of the first elastic member, and the striking block will reciprocate relative to the transmission shaft; since the transmission shaft is still rotating, the first protrusion will impact the transverse foot intermittently when the striking block is stretching and retracting, so that the output shaft will be continuously impacted, and the screw will be tightened more tightly; the transmission shaft is provided with a guide groove, and a steel ball is arranged between the guide groove and the striking block; the guide groove and the steel ball are common structures known in the prior art hammer drill tool, which are not shown in the drawings.

[0009] As preferred, the fixing assembly further comprises a limiting pin and a positioning bearing, the end face of the hammer body towards the output shaft is provided with a plurality of adjacent limiting protrusions, and a limiting clamping groove is arranged between any two limiting protrusions; the output shaft is provided with a pair of outer protrusions, the outer protrusions are installed in two limiting clamping grooves; the fixing seat is sleeved on the output shaft and synchronously sleeved on the limiting protrusions; the limiting pin is arranged between the output shaft and the fixing seat, and the limiting pin is installed in the limiting clamping groove.

[0010] As preferred, the outer contour of the outer protrusion and the outer contour of the limiting clamping groove are mutually adapted; the outer contour of the limiting protrusion and the inner contour of the fixing seat are mutually adapted, and the outer wall of the limiting protrusion and the inner wall of the fixing seat are arranged in abutment.

[0011] Preferably, a positioning bearing is installed between the output shaft and the housing, and the positioning bearing is fitted with the fixed seat; a first retaining ring is provided on the output shaft, and the positioning bearing is fitted with the first retaining ring.

[0012] The hammer body and output shaft are connected by a fixed base, which ensures better concentricity between the output shaft and the drive shaft, making the output shaft rotation more stable. A limit pin between the fixed base and the output shaft further secures the fixed base. Because the output shaft vibrates significantly under impact, a fixed base and a positioning bearing are used to further stabilize its rotation. The interplay of the limit slot and the outward protrusion ensures that the output shaft and hammer body rotate synchronously, preventing misalignment.

[0013] Preferably, the output shaft is provided with a locking assembly for locking the working head. The locking assembly includes a telescopic sleeve, a second elastic element, a second retaining ring, and a limiting bead. The telescopic sleeve is sleeved and installed on the output shaft, which is provided with a first retaining ring and a second retaining ring. The telescopic sleeve is disposed between the first retaining ring and the second retaining ring. A second elastic element is provided between the telescopic sleeve and the second retaining ring, with one end of the second elastic element abutting against the telescopic sleeve and the other end of the second elastic element abutting against the second retaining ring. The telescopic sleeve has a receiving cavity, and a limiting bead is provided between the output shaft and the receiving cavity. The output shaft has a limiting hole for inserting the limiting bead.

[0014] The working head has a hole for installing a limit bead. In the default state, the limit bead is locked in the limit hole and on the working head. At this time, the limit bead abuts against the inner wall of the telescopic sleeve and cannot move radially. Thus, the working head is limited by the limit bead and can be firmly installed on the output shaft. When the working head needs to be replaced, push the telescopic sleeve in the direction of the second retaining spring. This aligns the receiving cavity with the limit hole, and the limit bead can then move into the receiving cavity. Then, remove the old working head and insert the new working head. Finally, release the telescopic sleeve. Under the action of the second elastic element, the telescopic sleeve returns to its default initial position, and the limit bead is locked back in the limit hole and on the new working head. The new working head is then firmly installed.

[0015] Preferably, the housing also includes a circuit board, a insert, and a toggle switch; the insert and the circuit board are electrically connected, and the circuit board is electrically connected to the motor; the insert and the battery are arranged adjacent to each other, and the circuit board has a charging interface; a reversing switch is provided between the housing and the circuit board, and the reversing switch is oriented towards the contacts on the circuit board; the toggle switch is located between the motor and the insert, and the toggle switch is electrically connected to the circuit board; the rated voltage of the battery is less than or equal to 4V, the striking frequency of the striking block and the hammer is greater than 30Hz, the output torque of the output shaft is in Nm, the ratio of the output torque of the output shaft to the rated voltage of the battery is greater than 4.5, and the output torque of the output shaft is greater than 8Nm.

[0016] The toggle switch is used to control the start of the motor; the motor will rotate when the toggle switch is pressed. A reversing switch is provided so that the direction of the motor can be switched via the circuit board.

[0017] Compared with the prior art, this utility model has the following advantages: 1. By limiting the output shaft and hammer body through the fixing component, the rotation process of the output shaft is more stable and reliable. 2. The output shaft and hammer body are set separately, which facilitates the disassembly and assembly of the output shaft. At the same time, the impact force on the output shaft by the hammer body is more uniform, resulting in a better impact effect. 3. Through the cooperation of the impact component and the reduction transmission device, the output shaft is also impacted by the hammer body while rotating, resulting in a larger output torque and better screw disassembly and assembly. Attached Figure Description

[0018] Figure 1 This is a perspective view of the present utility model;

[0019] Figure 2 This is a perspective view of the present invention from another angle;

[0020] Figure 3 This is a diagram of the internal structure of the present invention;

[0021] Figure 4 for Figure 3 A magnified view of a portion of position A in the middle;

[0022] Figure 5 This is an exploded view of the present invention;

[0023] Figure 6 for Figure 5 A magnified view of a portion of position B in the middle;

[0024] The diagram shows the following components: 1. Housing; 2. Motor; 3. Battery; 4. Reduction transmission device; 41. Transmission component body; 42. Planetary reduction assembly; 43. Mounting base; 44. Drive shaft; 5. Output shaft; 51. Outer protrusion; 6. Impact assembly; 61. Strike block; 62. Hammer body; 63. First elastic element; 64. First protrusion; 65. Cross foot; 66. Limiting protrusion; 67. Limiting slot; 7. Fixing assembly; 71. Fixing seat; 72. Limiting pin; 73. Positioning bearing; 74. First snap ring; 8. Locking assembly; 81. Telescopic bushing; 82. Second elastic element; 83. Second snap ring; 84. Limiting bead; 85. Receiving cavity; 86. Limiting hole; 9. Circuit board; 10. Insert; 11. Toggle switch; 12. Charging interface; 13. Reversing switch. Detailed Implementation

[0025] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings:

[0026] like Figures 1 to 6 As shown, this embodiment discloses a screwdriver structure, including a housing 1, a motor 2 and a battery 3 inside the housing 1, and a speed reduction transmission device 4 connected to the motor 2 inside the housing 1. The speed reduction transmission device 4 includes a transmission body 41 that rotates synchronously with the motor 2. The head of the housing 1 is provided with an output shaft 5 that is rotatably connected to it. The output shaft 5 is connected to the transmission body 41, and an impact component 6 is provided between the output shaft 5 and the transmission body 41. The impact component 6 includes a striking block 61 and a hammer 62. The striking block 61 can extend and retract relative to the transmission body 41. A fixing component 7 is provided between the output shaft 5 and the housing 1. The fixing component 7 includes a fixing seat 71, and the fixing seat 71 connects the hammer 62 and the output shaft 5.

[0027] The speed reduction transmission device 4 further includes a planetary speed reduction assembly 42. The transmission component body 41 is mounted on the planetary speed reduction assembly 42 and meshes with it. The transmission component body 41 is connected to the motor 2, and the motor 2 drives the transmission component body 41 to rotate when it is working. An impact assembly 6 is provided on the outer layer of the transmission component body 41. The impact assembly 6 further includes a first elastic element 63. The transmission component body 41 includes a mounting base 43 and a transmission shaft 44. The mounting base 43 is connected to the planetary speed reduction assembly 42, and the transmission shaft 44 and the mounting base 43 are integrally formed. A striking block 61 and the first elastic element 63 are sleeved and mounted on the transmission shaft 44. One end of the first elastic element 63 abuts against the mounting base 43, and the other end of the first elastic element 63 abuts against the striking block 61. The hammer body 62 is sleeved and mounted on the output shaft 5, and the hammer body 62 rotates synchronously with the output shaft 5. The striking block 61 has a pair of first protrusions 64 on its end face facing the output shaft 5, and the hammer body 62 has a pair of horizontal feet 65; each horizontal foot 65 corresponds to each of the first protrusions 64; in the default state, the side of the first protrusion 64 and the side of the horizontal foot 65 are fitted together.

[0028] The fixing assembly 7 further includes a limiting pin 72 and a positioning bearing 73. The hammer body 62 has several adjacent limiting protrusions 66 on its end face facing the output shaft 5, with a limiting groove 67 between any two limiting protrusions 66. The output shaft 5 has paired external protrusions 51, which are installed in two of the limiting grooves 67. The fixing seat 71 is sleeved on the output shaft 5 and simultaneously sleeved on the limiting protrusions 66. A limiting pin 72 is provided between the output shaft 5 and the fixing seat 71, and the limiting pin 72 is installed in the limiting groove 67. The outer contour of the external protrusion 51 matches the outer contour of the limiting groove 67; the outer contour of the limiting protrusion 66 matches the inner contour of the fixing seat 71, and the outer wall of the limiting protrusion 66 fits snugly against the inner wall of the fixing seat 71. A positioning bearing 73 is installed between the output shaft 5 and the housing 1, and the positioning bearing 73 is fitted with the fixed seat 71; a first retaining ring 74 is provided on the output shaft 5, and the positioning bearing 73 is fitted with the first retaining ring 74.

[0029] The output shaft 5 is provided with a locking assembly 8 for locking the working head. The locking assembly 8 includes a telescopic sleeve 81, a second elastic element 82, a second retaining ring 83, and a limiting bead 84. The telescopic sleeve 81 is sleeved and installed on the output shaft 5. The output shaft 5 is provided with a first retaining ring 74 and a second retaining ring 83. The telescopic sleeve 81 is disposed between the first retaining ring 74 and the second retaining ring 83. The second elastic element 82 is provided between the telescopic sleeve 81 and the second retaining ring 83. One end of the second elastic element 82 abuts against the telescopic sleeve 81, and the other end of the second elastic element 82 abuts against the second retaining ring 83. The telescopic sleeve 81 is provided with a receiving cavity 85. The output shaft 5 is provided with a limiting bead 84 between the receiving cavity 85 and the receiving shaft 5. The output shaft 5 is provided with a limiting hole 86 for inserting the limiting bead 84. The housing 1 also includes a circuit board 9, a insert 10, and a toggle switch 11; the insert 10 and the circuit board 9 are electrically connected, and the circuit board 9 is electrically connected to the motor 2; the insert 10 and the battery 3 are arranged adjacent to each other, and the circuit board 9 has a charging interface 12; a reversing switch 13 is provided between the housing 1 and the circuit board 9, and the reversing switch 13 is arranged facing the contacts on the circuit board 9; the toggle switch 11 is located between the motor 2 and the insert 10, and the toggle switch 11 is electrically connected to the circuit board 9; the rated voltage of the battery 3 is less than or equal to 4V, the striking frequency of the striking block 61 and the hammer 62 is greater than 30Hz, the output torque of the output shaft 5 is in Nm, the ratio of the output torque of the output shaft 5 to the rated voltage of the battery 3 is greater than 4.5, and the output torque of the output shaft 5 is greater than 8Nm.

[0030] The specific operation process of this embodiment is as follows: When the motor 2 is working, it drives the transmission body 41 to rotate. The speed ratio between the transmission body 41 and the motor 2 is converted through the planetary reduction assembly 42, so that the output torque of the output shaft 5 is greater. When the transmission body 41 rotates, it drives the output shaft 5 to rotate synchronously. A working head is installed on the output shaft 5, and screws can be driven through the working head. The working head is not shown in the attached drawings of the instruction manual. In the default state, the drive shaft 44 drives the output shaft 5 and the hammer body 62 to rotate synchronously. When initially tightening the screw, the screw is not tightened, and the torque on the output shaft 5 is small. At this time, the side of the first protrusion 64 and the side of the cross foot 65 are in contact, and the striking block 61 and the hammer body 62 rotate synchronously. The striking block 61 will not impact the hammer body 62 at this time. When the screw is about to be tightened, the torque on the output shaft 5 is large. At this time, the striking block 61 will overcome the elastic force of the first elastic element 63, and the striking block 61 will reciprocate relative to the drive shaft 44. Since the drive shaft 44 is still rotating, the first protrusion 64 will intermittently impact the cross foot 65 when the striking block 61 retracts, so the output shaft 5 will be continuously impacted, and the screw will be tightened more. The drive shaft 44 is provided with a guide groove, and a steel ball is provided between the guide groove and the striking block 61. The guide groove and the steel ball are common structures known and disclosed in existing hammer drill tools, and are not shown in the attached drawings of the instruction manual. The hammer body 62 and the output shaft 5 are connected by a fixed base 71, which improves the concentricity of the output shaft 5 and the transmission shaft 44, making the rotation of the output shaft 5 more stable. A limiting pin 72 is placed between the fixed base 71 and the output shaft 5, making the fixed base 71 more securely installed. Since the output shaft 5 vibrates significantly when subjected to impact, a fixed base 71 and a positioning bearing 73 are used to further stabilize the rotation of the output shaft 5. The limiting slot 67 and the outward protrusion 51 work together to ensure that the output shaft 5 and the hammer body 62 rotate synchronously, preventing misalignment.

[0031] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or adopt similar methods to replace them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A screwdriver structure, comprising a housing (1), wherein a motor (2) and a battery (3) are disposed within the housing (1), characterized in that, The housing (1) is also provided with a speed reduction transmission device (4) connected to the motor (2). The speed reduction transmission device (4) includes a transmission body (41) that rotates synchronously with the motor (2). The head of the housing (1) is provided with an output shaft (5) that is rotatably connected to it. The output shaft (5) is connected to the transmission body (41). An impact assembly (6) is provided between the output shaft (5) and the transmission body (41). The impact assembly (6) includes a striking block (61) and a hammer (62). The striking block (61) can extend and retract relative to the transmission body (41). A fixing assembly (7) is provided between the output shaft (5) and the housing (1). The fixing assembly (7) includes a fixing seat (71). The fixing seat (71) connects the hammer (62) and the output shaft (5).

2. The screwdriver structure according to claim 1, characterized in that, The speed reduction transmission device (4) further includes a planetary speed reduction assembly (42), the transmission body (41) is mounted on the planetary speed reduction assembly (42) and meshes with it; the transmission body (41) is connected to a motor (2), and the motor (2) drives the transmission body (41) to rotate when it is working; the outer layer of the transmission body (41) is provided with an impact assembly (6).

3. The screwdriver structure according to claim 2, characterized in that, The impact assembly (6) includes a first elastic element (63), and the transmission body (41) includes a mounting base (43) and a transmission shaft (44); the mounting base (43) is connected to the planetary reduction assembly (42), and the transmission shaft (44) and the mounting base (43) are integrally formed; the transmission shaft (44) is fitted with an impact block (61) and a first elastic element (63), one end of the first elastic element (63) abuts against the mounting base (43), and the other end of the first elastic element (63) abuts against the impact block (61); the hammer body (62) is fitted on the output shaft (5), and the hammer body (62) rotates synchronously with the output shaft (5).

4. The screwdriver structure according to claim 3, characterized in that, The striking block (61) has a pair of first protrusions (64) on its end face facing the output shaft (5), and the hammer body (62) has a pair of horizontal feet (65); each horizontal foot (65) corresponds to each of the first protrusions (64); in the default state, the side of the first protrusion (64) and the side of the horizontal foot (65) are fitted together.

5. The screwdriver structure according to claim 1, characterized in that, The fixing component (7) also includes a limiting pin (72) and a positioning bearing (73). The end face of the hammer body (62) facing the output shaft (5) is provided with a plurality of adjacent limiting protrusions (66), and a limiting groove (67) is provided between any two limiting protrusions (66). The output shaft (5) is provided with a pair of external protrusions (51), and the external protrusions (51) are installed in two of the limiting grooves (67). The fixing seat (71) is sleeved on the output shaft (5) and simultaneously sleeved on the limiting protrusions (66). A limiting pin (72) is provided between the output shaft (5) and the fixing seat (71), and the limiting pin (72) is installed in the limiting groove (67).

6. The screwdriver structure according to claim 5, characterized in that, The outer contour of the protrusion (51) is adapted to the outer contour of the limiting groove (67); the outer contour of the limiting protrusion (66) is adapted to the inner contour of the fixing seat (71); the outer wall of the limiting protrusion (66) and the inner wall of the fixing seat (71) are fitted together.

7. The screwdriver structure according to claim 5, characterized in that, A positioning bearing (73) is installed between the output shaft (5) and the housing (1), and the positioning bearing (73) is fitted with the fixed seat (71); a first snap ring (74) is provided on the output shaft (5), and the positioning bearing (73) is fitted with the first snap ring (74).

8. The screwdriver structure according to claim 1, characterized in that, The output shaft (5) is provided with a locking assembly (8) for locking the working head. The locking assembly (8) includes a telescopic bushing (81), a second elastic element (82), a second retaining ring (83), and a limiting bead (84). The telescopic bushing (81) is sleeved and installed on the output shaft (5). The output shaft (5) is provided with a first retaining ring (74) and a second retaining ring (83). The telescopic bushing (81) is disposed between the first retaining ring (74) and the second retaining ring (83). A second elastic element (82) is provided between the telescopic bushing (81) and the second retaining ring (83). One end of the second elastic element (82) abuts against the telescopic bushing (81), and the other end of the second elastic element (82) abuts against the second retaining ring (83). The telescopic bushing (81) is provided with a receiving cavity (85). A limiting bead (84) is provided between the output shaft (5) and the receiving cavity (85). A limiting hole (86) for inserting the limiting bead (84) is provided on the output shaft (5).

9. The screwdriver structure according to claim 1, characterized in that, The housing (1) is also provided with a circuit board (9), a plug (10) and a toggle switch (11); the plug (10) and the circuit board (9) are electrically connected, and the circuit board (9) is electrically connected to the motor (2); the plug (10) and the battery (3) are arranged adjacent to each other, and the circuit board (9) is provided with a charging interface (12); a reversing switch (13) is provided between the housing (1) and the circuit board (9), and the reversing switch (13) is arranged facing the contacts on the circuit board (9); the toggle switch (11) is arranged between the motor (2) and the plug (10), and the toggle switch (11) is electrically connected to the circuit board (9); the rated voltage of the battery (3) is less than or equal to 4V, the striking frequency of the striking block (61) and the hammer (62) is greater than 30Hz, the output torque of the output shaft (5) is in Nm, the ratio of the output torque of the output shaft (5) to the rated voltage of the battery (3) is greater than 4.5, and the output torque of the output shaft (5) is greater than 8Nm.

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