Electric hammer capable of adjusting gears in working state

Abstract

The utility model provides an electric hammer capable of adjusting gears in a working state, and belongs to the technical field of electric tools. The problem that an existing electric hammer is prone to being stuck during gear shifting in the working process is solved. The electric hammer capable of adjusting the gears in the working state comprises a machine shell, a rotating sleeve, a rotating output mechanism, a hammering output mechanism, a driving motor, a clutch mechanism and a rotary knob, the rotating output mechanism comprises a rotating wheel, and the clutch mechanism comprises a clutch gear, a buffering sleeve and a first spring. The rotating wheel, the clutch gear and the buffering sleeve can be movably arranged on the rotating sleeve in a sleeving mode in the axial direction of the rotating sleeve, the clutch gear and the rotating sleeve are locked in the rotating direction, the clutch gear, the rotating wheel and the buffering sleeve can be locked and separated in the rotating direction, and the buffering sleeve and the machine shell are in sliding fit in the axial direction of the rotating sleeve and are locked in the rotating direction. And the first spring is used for driving the buffer sleeve to move towards one side of the rotating wheel. Locking is formed through matching of the buffering sleeve and the clutch gear, and the whole separation and locking process is smoother and more stable.

Description

TECHNICAL FIELD

[0001] The utility model belongs to electric tool technical field relates to an electric hammer, especially a kind of electric hammer of adjustable gear in working condition. BACKGROUND

[0002] Electric hammer is a kind of electric rotary hammer drill with pneumatic hammer mechanism and safety clutch. In order to cope with different working conditions, electric hammer is usually provided with clutch mechanism, so that electric hammer has two working modes, one is hammering mode of only outputting impact, and the other is hammer drill mode of outputting both impact and rotary power. When electric hammer works, gear can be adjusted to switch between the two modes.

[0003] As disclosed in Chinese patent application (application number: 202221620236.1), a kind of adjustable electric hammer transmission gear structure, including rotating assembly and hammering assembly, rotating assembly includes rotating output gear, gear change gear and rotating sleeve, the lower end of rotating output gear is connected with motor output gear and drives, the upper end of rotating output gear is engaged with gear change gear through helical gear mechanism and drives, the lower end of hammering output gear is connected with crank connecting rod piston and drives, crank connecting rod piston and rotating sleeve rear end cooperate to constitute piston hammering mechanism, it can be realized by gear adjustment knob control gear change gear sliding forward and backward and realize the clutch of rotating output gear. However, since driving gear change gear and rotating output gear are separated and need to be embedded in gear limiter to limit the rotation of gear change gear, if the electric hammer using this scheme is directly separated during work, gear change gear will rotate at high speed, it is difficult for gear change gear to form cooperation with gear limiter, and gear change gear often abuts against the end surface of gear limiter and is stuck, so that gear change gear cannot be embedded in gear limiter to form locking, thereby causing certain safety hazard. SUMMARY

[0004] The utility model aims at the above-mentioned problems existing in prior art, proposes a kind of electric hammer of adjustable gear in working condition, and the technical problems to be solved by the utility model are: how to make electric hammer switch gear more smoothly in working condition.

[0005] The objective of this utility model can be achieved through the following technical solution: an electric hammer with adjustable working state, comprising a housing, a rotating sleeve, a rotary output mechanism, a hammering output mechanism, a drive motor, a clutch mechanism, and a knob, wherein the rotating sleeve is rotatably connected inside the housing, characterized in that the rotary output mechanism includes a bevel gear, the clutch mechanism includes a clutch, a buffer sleeve, and a first spring, the bevel gear, the clutch, and the buffer sleeve are all movably mounted on the rotating sleeve along the axial direction and arranged sequentially along the axial direction of the rotating sleeve, the bevel gear is drive-connected to the drive motor, the clutch is locked to the rotating sleeve in the rotation direction and can be locked and disengaged from the bevel gear and the buffer sleeve respectively in the rotation direction, the buffer sleeve is slidably engaged with the housing in the axial direction of the rotating sleeve and locked in the rotation direction, and the first spring is used to drive the buffer sleeve to move towards the clutch side.

[0006] This invention features a rotating sleeve that can hold a drill bit or chisel. A rotational output mechanism provides torque to the sleeve, while a hammering output mechanism provides impact force. Mode switching is achieved by actuating the clutch mechanism. A buffer sleeve is installed between the locking groove of the housing and the clutch. When the user controls the clutch to move away from the bevel gear via a knob, the clutch first contacts the buffer sleeve. If the clutch engages with the buffer sleeve, they lock together, stopping the clutch from rotating. If the clutch does not engage, they abut against each other. In this case, the pressure of the clutch on the buffer sleeve is greater than the spring force of the first spring, causing the buffer sleeve to move away from the clutch. This maintains a low pressure between the clutch and the buffer sleeve, reducing friction and allowing the clutch to rotate relative to it. The clutch locks after reaching the engagement angle with the buffer sleeve, preventing the clutch from jamming and ensuring smooth disengagement from the bevel gear.

[0007] In the aforementioned adjustable-gear electric hammer, the housing includes a front housing and a rear housing. The front housing has a central hole, and several locking grooves are spaced apart circumferentially along the axial direction of the central hole. One end of the buffer sleeve extends into the central hole and slides into it. The buffer sleeve has several locking blocks circumferentially corresponding to and slidingly engaging with the locking grooves. The buffer sleeve, through the engagement of the locking blocks with the locking grooves on the front housing, allows it to move axially and lock in the rotational direction.

[0008] In the aforementioned electric hammer with adjustable working settings, a retaining edge is provided on the end face of the buffer sleeve facing the clutch. The retaining edge allows the buffer sleeve to move into position towards the center hole and abut against the end face of the center hole.

[0009] In the electric hammer with the working state adjusting gear position, the inner wall of the clutch has a plurality of axially arranged key grooves, and the rotating sleeve is provided with a plurality of flat keys corresponding to the key grooves and embedded in the corresponding key grooves.

[0010] In the electric hammer with the working state adjusting gear position, the bevel gear has a plurality of meshing teeth one protruding outward in the axial direction on the side facing the clutch, and the clutch has a plurality of meshing teeth two protruding outward in the axial direction on the side facing the bevel gear, and the meshing teeth one can be engaged with the meshing teeth two.

[0011] In the electric hammer with the working state adjusting gear position, the number of the key grooves on the clutch is the same as that of the meshing teeth two, and the key grooves correspond to the meshing teeth two one by one, and the key grooves are through grooves and extend to the end of the meshing teeth two. In this way, the length of the through groove can be maximized, so that the stroke of the clutch is maximized, and the clutch is more completely separated from the bevel gear.

[0012] In the electric hammer with the working state adjusting gear position, the clutch mechanism further comprises a second spring, the second spring abuts against the clutch and makes the clutch always have a tendency to move to the side of the bevel gear. The second spring is arranged to facilitate the engagement of the clutch with the bevel gear.

[0013] Compared with the prior art, the utility model has the following advantages:

[0014] 1、The utility model discloses a buffer sleeve is arranged in the clutch mechanism, the buffer sleeve can move along the rotating sleeve axial direction and forms the locking in the rotating direction relative to the casing, when the clutch is separated in the working state gear position of electric hammer, the clutch can keep smaller pressure and friction with the buffer sleeve when contacting with the buffer sleeve, make the clutch can rotate relative to the buffer sleeve and form the locking after rotating in place, the whole separating, locking process is more smooth and stable.

[0015] 2、The clutch is provided with a key groove in the inner wall and is connected with the rotating sleeve through a flat key, and the key groove is correspondingly arranged with the meshing teeth two, so that the key groove extends to the end face of the clutch, thereby maximizing the length of the key groove, so that the clutch has a larger stroke while having a smaller axial dimension, and the clutch is more completely and smoothly separated. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the perspective view of the utility model;

[0017] Figure 2 It is the structure schematic diagram of the hidden part casing of the utility model;

[0018] Figure 3 It is the sectional view of the utility model;

[0019] Figure 4This is an exploded view of the clutch mechanism and rotating sleeve of this utility model;

[0020] Figure 5 yes Figure 3 Enlarged view of part A in the middle;

[0021] Figure 6 This is a schematic diagram of the front housing structure;

[0022] Figure 7 This is a schematic diagram of the buffer sleeve structure;

[0023] Figure 8 This is a schematic diagram of the clutch structure;

[0024] Figure 9 This is a schematic diagram of a bevel gear.

[0025] In the diagram, 1. Housing; 11. Front housing; 11a. Center hole; 11b. Locking groove; 12. Rear housing; 2. Rotating sleeve; 3. Rotary output mechanism; 31. Bevel gear; 311. Meshing tooth one; 32. Rotating shaft one; 33. Bevel gear; 4. Hammering output mechanism; 41. Rotating shaft two; 42. Eccentric wheel; 43. Cylinder; 44. Piston; 45. Rocker arm; 46. Hammer head; 5. Drive motor; 6. Clutch mechanism; 61. Clutch; 61a. Keyway; 611. Meshing tooth two; 612. Slider part; 62. Buffer sleeve; 62a. Slide groove; 621. Locking block; 63. First spring; 622. Stop edge; 64. Second spring; 7. Knob; 71. Lever; 8. Clamp. Detailed Implementation

[0026] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0027] A type of electric hammer with adjustable working settings, such as Figure 1 , Figure 2 As shown, the device includes a housing 1, a rotating sleeve 2, a rotary output mechanism 3, a hammering output mechanism 4, a drive motor 5, a clutch mechanism 6, and a knob 7. The rotating sleeve 2 is rotatably mounted inside the housing 1, and one end of the rotating sleeve 2 is fixedly connected to a chuck 8, which can hold tools such as drill bits or chisels. The rotary output mechanism 3 and the hammering output mechanism 4 can respectively output torque and axial impact force to the rotating sleeve 2. The drive motor 5 is mounted inside the housing 1 and is connected to the rotary output mechanism 3 and the hammering output mechanism 4 respectively. The clutch mechanism 6 is located between the rotary output mechanism 3 and the rotating sleeve 2. By rotating the knob 7, the rotary output mechanism 3 and the rotating sleeve 2 can be engaged or disengaged, thereby allowing the device to switch between hammering mode and hammer drilling mode.

[0028] Specifically, such as Figure 2 ,Figure 3 As shown, in the embodiment, the driving motor 5 is vertically arranged at the tail of the casing 1 relative to the rotating sleeve 2, the rotating output mechanism 3 comprises a bevel gear 31, a rotating shaft 32 and a conical gear 33, wherein the bevel gear 31 is sleeved on the rotating sleeve 2 and can rotate relative to the rotating sleeve 2, the rotating shaft 32 is arranged on one side of the main shaft of the driving motor 5 and is parallel to the main shaft of the driving motor 5, the conical gear 33 is fixedly arranged on the upper end of the rotating shaft 32, the lower end of the rotating shaft 32 is drivingly connected with the main shaft of the driving motor 5 through a gear pair, and one side of the bevel gear 31 is provided with a bevel gear and is engaged with the conical gear 33, so that the driving motor 5 can drive the bevel gear 31 to rotate. Figures 3 to 9As shown, the clutch mechanism 6 comprises a clutch 61, a buffer sleeve 62, a first spring 63 and a second spring 64, the clutch 61 and the buffer sleeve 62 are both hollow cylindrical and are sleeved on the rotating sleeve 2 axially slidably, the inner wall of the clutch 61 is provided with a plurality of axially arranged key grooves 61a, the rotating sleeve 2 is provided with a plurality of flat keys corresponding to the key grooves 61a in the circumferential direction, the clutch 61 and the rotating sleeve 2 are connected through the flat keys, so that the clutch 61 is locked with the rotating sleeve 2 in the rotating direction. The shell 1 comprises a front shell body 11 and a rear shell body 12, the front shell body 11 has a central hole 11a coaxial with the rotating sleeve 2, the inner wall of the central hole 11a is provided with a plurality of axially arranged locking grooves 11b, the central hole 11a, the buffer sleeve 62, the clutch 61 and the transmission wheel are arranged in sequence along the axial direction of the rotating sleeve 2, the bevel gear 31 is provided with a plurality of meshing teeth one 311 protruding outward along the axial direction of the bevel gear 31 on the side facing the clutch 61, the clutch 61 is provided with a plurality of meshing teeth two 611 protruding outward along the axial direction of the clutch 61 on the side facing the bevel gear 31, the meshing teeth one 311 can be engaged with the meshing teeth two 611, when the clutch 61 moves to the side of the transmission wheel and is engaged with the transmission wheel, the driving motor 5 can drive the rotating sleeve 2 to rotate, when the clutch 61 is separated from the transmission wheel, the driving motor 5 outputs torque to the rotating sleeve 2 is interrupted. The side of the clutch 61 facing the buffer sleeve 62 is provided with a plurality of slider parts 612 distributed in the circumferential direction, the inner wall of the buffer sleeve 62 is provided with a plurality of slide grooves 62a, the number of the slide grooves 62a is the same as and corresponds to the slider parts 612, the openings of the slide grooves 62a all face the side of the clutch 61, the end of the clutch 61 facing the buffer sleeve 62 can extend into the buffer sleeve 62 and make the slider parts 612 embedded in the corresponding slide grooves 62a. The locking grooves 11b on the front shell body 11 are arranged in the central hole 11a in the circumferential direction, one end of the buffer sleeve 62 extends into the central hole 11a and is in sliding cooperation with the central hole 11a, the outer circumferential surface of the side of the buffer sleeve 62 facing the central hole 11a is also provided with a plurality of locking blocks 621, the number of the locking blocks 621 is the same as and corresponds to the locking grooves 11b, the locking block 621 and the corresponding locking groove 11b form sliding cooperation, so that the buffer sleeve 62 can move along the axial direction of the rotating sleeve 2 relative to the front shell body 11 and lock the buffer sleeve 62 in the rotating direction of the buffer sleeve 62. The end face of the side of the buffer sleeve 62 facing the clutch 61 is also provided with a stop 622, so that the buffer sleeve 62 can abut against the end face of the central hole 11a after moving to the side of the central hole 11a in place, thereby limiting the movement stroke of the buffer sleeve 62. The first spring 63 and the second spring 64 are both sleeved on the rotating sleeve 2 and abut against the buffer sleeve 62 and the clutch 61 respectively, so that the buffer sleeve 62 and the clutch 61 always have a tendency to move to the side of the bevel gear 31, and the buffer sleeve 62 and the bottom wall of the locking groove 11b maintain a certain distance. As Figure 2As shown, the knob 7 is arranged on one side of the casing 1, and the inner side of the knob 7 is provided with a shifting rod 71, one end of the shifting rod 71 extends into the clutch 61 and the transmission wheel, so that the knob 7 can drive the clutch 61 and the transmission wheel to be separated, and also can make the clutch 61 and the transmission wheel engage under the action of the second spring 64.

[0029] Further, as shown in the embodiment, Figure 7 As shown, in the embodiment, the number of the engaging teeth two 611 on the clutch 61 is four, the number of the key grooves 61a on the inner wall of the clutch 61 is also four and corresponds to the engaging teeth two 611 one by one, the four key grooves 61a are all through grooves and respectively extend to the end of the corresponding engaging teeth two 611 along the axial direction of the clutch 61, so that the length of the key groove 61a is maximized, and the clutch 61 has a larger stroke without increasing the length.

[0030] As shown in the embodiment, Figure 2 、 Figure 3 As shown, the hammering mechanism includes a second rotating shaft 41, an eccentric wheel 42, a rocker 45, a piston 44, a cylinder 43 and a hammer head 46, wherein the second rotating shaft 41 is arranged in parallel with the first rotating shaft 32, so that the first rotating shaft 32 and the second rotating shaft 41 are respectively located on the two sides of the main shaft of the driving motor 5, the second rotating shaft 41 is also connected with the main shaft of the driving motor 5 through a gear pair, the eccentric wheel 42 is arranged on the upper end of the second rotating shaft 41, the hammer head 46 and the cylinder 43 are slidingly connected in the rotating sleeve 2, the piston 44 is slidingly connected in the cylinder 43 and is hinged with the rocker 45, the other end of the rocker 45 is hinged with the eccentric wheel 42, so that the driving motor 5 can drive the hammer head 46 to reciprocate along the axial direction of the rotating sleeve 2 and impact the drill bit or the chisel on the front section of the rotating sleeve 2.

[0031] The working principle of the utility model is as follows: when the knob 7 is located in the hammer drill gear position, the clutch 61 is engaged with the bevel gear 31 under the action of the second spring 64, so that the driving motor 5 can work simultaneously on the rotating output mechanism 3 and the hammering output mechanism 4; at this time, the gear is shifted, the shifting rod 71 on the knob 7 drives the clutch 61 to move to the side of the buffer sleeve 62, the clutch 61 is separated from the transmission wheel and is in contact with the buffer sleeve 62, at this time, the clutch 61 still rotates under the action of inertia, the buffer sleeve 62 slides to the direction of the locking groove 11b under the thrust of the clutch 61, so that the buffer sleeve 62 and the clutch 61 keep a small pressure, and the clutch 61 can rotate relative to the buffer sleeve 62, when the clutch 61 rotates to the angle that the sliding block part 612 is aligned with the sliding groove 62a on the buffer sleeve 62, the buffer sleeve 62 slides to the side of the clutch 61 under the action of the first spring 63 and locks the clutch 61 and the buffer sleeve 62, then the clutch 61 continues to move under the driving of the shifting rod 71 and moves the buffer sleeve 62 to the position, and the final locking of the clutch 61 is completed.

[0032] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or replace them with similar ways, but will not deviate from the spirit of the present application or exceed the scope defined by the appended claims.

[0033] Although the terms such as the casing 1, the rotating sleeve 2, the rotating output mechanism 3, the hammer output mechanism 4, the eccentric wheel 42, the cylinder 43, the piston 44, the driving motor 5, the clutch mechanism 6, the knob 7, the chuck 8 are used more frequently herein, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of the present application; any kind of additional limitation by interpreting them is contrary to the spirit of the present application.

Claims

1. A workable state adjusting gear electric hammer, comprising a casing (1), a rotating sleeve (2), a rotating output mechanism (3), a hammering output mechanism (4), a driving motor (5), a clutch mechanism (6) and a knob (7), the rotating sleeve (2) is rotatably connected in the casing (1), characterized in that, The rotating output mechanism (3) comprises a bevel gear (31), the clutch mechanism (6) comprises a clutch (61), a buffer sleeve (62) and a first spring (63), the bevel gear (31), the clutch (61) and the buffer sleeve (62) are all movably sleeved on the rotating sleeve (2) in the axial direction of the rotating sleeve (2) and are arranged in sequence in the axial direction of the rotating sleeve (2), the bevel gear (31) is in transmission connection with the driving motor (5), the clutch (61) is locked with the rotating sleeve (2) in the rotating direction and can be locked and separated with the bevel gear (31) and the buffer sleeve (62) in the rotating direction respectively, the buffer sleeve (62) is in sliding fit with the shell (1) in the axial direction of the rotating sleeve (2) and is locked in the rotating direction, and the first spring (63) is used for driving the buffer sleeve (62) to move towards the side of the clutch (61).

2. The workable state adjusting gear of the electric hammer according to claim 1, characterized in that, The shell (1) comprises a front shell body (11) and a rear shell body (12), the front shell body (11) is provided with a central hole (11a), a plurality of locking grooves (11b) are arranged in the axial direction of the central hole (11a) and are arranged at intervals in the circumferential direction of the central hole (11a), one end of the buffer sleeve (62) extends into the central hole (11a) and is in sliding fit with the central hole (11a), and a plurality of locking blocks (621) are arranged in the circumferential direction of the buffer sleeve (62) and are in sliding fit with the locking grooves (11b) one by one.

3. The workable state adjusting gear of the electric hammer according to claim 2, characterized in that, The end face of the buffer sleeve (62) towards the side of the clutch (61) is provided with a stop edge (622).

4. The workable state adjusting gear of the electric hammer according to claim 2 or 3, characterized in that, The inner wall of the clutch (61) is provided with a plurality of key grooves (61a) arranged in the axial direction, and the rotating sleeve (2) is provided with a plurality of flat keys corresponding to the key grooves (61a) and embedded in the corresponding key grooves (61a).

5. The workable state adjusting gear of the electric hammer according to claim 4, characterized in that, The side of the bevel gear (31) towards the clutch (61) is provided with a plurality of meshing teeth one (311) protruding outward in the axial direction, the side of the clutch (61) towards the bevel gear (31) is provided with a plurality of meshing teeth two (611) protruding outward in the axial direction, and the meshing teeth one (311) can be engaged with the meshing teeth two (611).

6. The workable state adjusting gear of the electric hammer according to claim 5, characterized in that, The number of the key grooves (61a) on the clutch (61) is the same as that of the meshing teeth two (611) and corresponds to the meshing teeth two (611) one by one, and the key grooves (61a) are through grooves and extend to the end of the meshing teeth two (611).

7. The workable state regulating gear electric hammer according to claim 4, characterized in that, The clutch mechanism (6) further comprises a second spring (64), the second spring (64) abuts against the clutch (61) and makes the clutch (61) always have a tendency to move towards the side of the bevel gear (31).

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