Electric hammer switching device and electric hammer

Abstract

The utility model discloses an electric hammer switching device and electric hammer, including slide bar, first plectrum, second plectrum and drive piece, slide bar, first plectrum, second plectrum all with slide bar slip connection, the rotation axis of drive piece is perpendicular to the axis of slide bar, drive piece includes first cam and second cam, and the first cam and the second cam are connected with each other. The first cam abuts against the first shifting piece and the second shifting piece, and in the rotating process of the driving piece, at least one matching position between the first cam and the first shifting piece or between the first cam and the second shifting piece is in a self-locking state. The electric hammer switching device and the electric hammer are convenient to operate and reliable in gear adjustment.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric hammer technical field, more specifically, relate to a kind of electric hammer switching device and electric hammer. BACKGROUND

[0002] Electric hammer, as a kind of efficient and multifunctional handheld electric tool, with its powerful drilling and hammering capacity, in industrial production, construction and interior decoration etc. Many fields have shown extensive application value. This kind of tool can realize the efficient operation to different materials (such as concrete, stone, wood etc.) by built-in motor drive, greatly improves work efficiency and operation quality.

[0003] In order to adapt to different working environment and operation demand, modern electric hammer is generally designed with multi-gear function conversion system, allows user to select appropriate torque and rotating speed setting according to specific task. User can adjust the working mode of electric hammer according to material hardness, hole size and operation precision etc. requirement, so as to ensure operation efficiency, also ensure operation quality and safety.

[0004] However, in actual application, the stability and reliability problem of electric hammer gear switching device gradually highlights. Especially in the case of frequent gear switching or long time continuous operation, gear locking mechanism can appear gear state unstable phenomenon due to wear, looseness or working vibration etc. So-called "slip gear" risk. Slip gear not only can cause electric hammer unable to maintain at set gear work, influence operation efficiency and precision, also can cause safety hazard, cause damage to operator and equipment itself. SUMMARY

[0005] Therefore, the utility model aims at providing a kind of electric hammer switching device and electric hammer, it is easy to operate, and gear adjustment is reliable.

[0006] In order to realize the above-mentioned purpose, first aspect, the present application provides a kind of electric hammer switching device, it includes: including slide rod, first paddle, second paddle and driving piece, the slide rod, the first paddle, the second paddle are all with the slide rod sliding connection, the rotation axis of the driving piece is perpendicular to the axis of the slide rod, the driving piece includes first cam and second cam, the first cam is with the first paddle and the second paddle abut, when the first cam and the first paddle or second paddle between during the rotation of the driving piece, at least one cooperation position is in self-locking state.

[0007] By the above technical scheme, when the driving member rotates, the first cam and the second cam can stably abut against the first shifting piece and the second shifting piece at all times, thereby realizing the switching of gears. The self-locking state between the first cam and the first shifting piece or the second shifting piece effectively reduces the risk of gear slipping caused by wear, looseness or work vibration, and improves the stability and reliability of gear switching.

[0008] In combination with the first aspect, in a further technical solution, the first cam has a distal end and a proximal end, a distance between the distal end abutment surface and the rotation axis of the driving member is greater than a distance between the proximal end abutment surface and the rotation axis of the driving member, and the second cam has an arc surface and a flat surface, the distal end corresponds to the arc surface, and the proximal end corresponds to the flat surface.

[0009] By the above technical scheme, the first cam and the second cam respectively drive different components to realize different functions, and the distal end and the proximal end of the first cam can realize the switching of different gears.

[0010] In combination with the first aspect, in a further technical solution, the first cam and the second cam are an integral structure.

[0011] By the above technical scheme, the first cam and the second cam are designed as an integral structure, which not only simplifies the structure of the switching device, but also reduces the manufacturing cost. This integrated design helps to reduce the number of parts, reduce assembly difficulty and time, improve production efficiency, and also improves the overall strength and reliability, facilitating the combination of the first cam and the second cam to realize different gear adjustments.

[0012] In combination with the first aspect, in a further technical solution, the first shifting piece has a first side plate, a second side plate, and a bottom plate connecting the first side plate and the second side plate, and the first side plate, the second side plate and the bottom plate are an integral U-shaped structure.

[0013] By the above technical scheme, the overall structural strength and stability of the shifting piece are significantly enhanced. The U-shaped structure forms a stable support relationship between the first side plate and the second side plate through the connection of the bottom plate, effectively resisting deformation caused by vibration and impact in operation or working environment, thereby improving the accuracy and reliability of gear switching. The integral structure can keep the first side plate and the second side plate structurally stable, and can realize accurate gear adjustment.

[0014] In combination with the first aspect, in a further technical solution, the abutment surface of the proximal end has a self-locking gap with the bottom plate, and self-locking is realized when the distal end simultaneously abuts against the first side plate and the bottom plate, or when the distal end simultaneously abuts against the second shifting piece and the bottom plate.

[0015] By the technical scheme, the self-locking gap is designed between the abutting surface of the distal end and the bottom plate, when the distal end of the driving member abuts against the first side plate of the first flapper and the bottom plate at the same time, or abuts against the second flapper and the bottom plate at the same time, the first cam cannot rotate on the bottom plate due to the self-locking gap, and the self-locking function is realized. The design effectively prevents the unexpected sliding of the gear during the operation, and improves the stability and reliability of the gear switching.

[0016] In combination with the first aspect, in a further technical scheme, when the distal end abuts against the first side plate and the bottom plate to realize self-locking, the first side plate applies a torque to the first cam to rotate in the direction of the bottom plate; and when the distal end abuts against the second flapper and the bottom plate to realize self-locking, the second flapper applies a torque to the first cam to rotate in the direction of the bottom plate.

[0017] By the technical scheme, when the distal end of the driving member abuts against the first side plate of the first flapper and the bottom plate to realize self-locking, the first side plate applies a torque to the first cam to rotate in the direction of the bottom plate. Similarly, when the distal end abuts against the second flapper and the bottom plate to realize self-locking, the second flapper also applies a torque to the first cam to rotate in the direction of the bottom plate. The two torques realize the stability of the self-locking state, and effectively prevent the unexpected sliding of the gear during the operation.

[0018] In combination with the first aspect, in a further technical scheme, the first elastic member is arranged on the slide rod, and the first elastic member keeps the first cam in abutment with the first flapper and the second flapper.

[0019] By the technical scheme, the first elastic member can provide a reset force, so that the first cam can stably contact the flapper even under harsh working conditions such as vibration or impact, thereby ensuring the accuracy and reliability of the gear switching.

[0020] In combination with the first aspect, in a further technical scheme, the switching device further comprises a lock piece and a second elastic member, the lock piece is in sliding connection with the slide rod, the lock piece has a lock tooth, and the second elastic member keeps the second cam in abutment with the lock piece.

[0021] By the technical scheme, the lock piece is used to realize the locking of the functions related to the electric hammer, and the design of the lock piece and the second elastic member enhances the reliability of the switching device in locking the functions related to the electric hammer.

[0022] In a second aspect, the application provides an electric hammer comprising the electric hammer switching device of the first aspect.

[0023] With the second aspect, further technical solutions further include a shell, a drive shaft, the slide rod axis and the drive shaft axis are arranged in parallel, the drive member is rotationally arranged on the shell, a spline and a drive gear are slidably connected on the drive shaft, the first toggle plate is rotationally connected with the spline and moves synchronously in the direction of the drive shaft axis, and the second toggle plate is rotationally connected with the drive gear and moves synchronously in the direction of the drive shaft axis.

[0024] Through the above technical solutions, the electric hammer technical solutions integrate the electric hammer switching device of the first aspect, the switching device has the advantages of stability, reliability, and easy operation, and can significantly improve the gear switching efficiency and reliability of the electric hammer. The design of the slidably connected gear and toggle plate enables the electric hammer to adapt to different operation requirements to realize different clutch operations and adjust different functions, and users can select appropriate gears according to actual conditions, thereby improving the application range and flexibility of the electric hammer.

[0025] In summary, the present application has at least one of the following beneficial technical effects:

[0026] 1. The electric hammer switching device of the present application has simple structure, high stability and reliability of gear switching.

[0027] 2. The electric hammer switching device of the present application has a self-locking function, which can further improve the stability of the gears and reduce the loosening of the gears during operation.

[0028] 3. The electric hammer of the present application significantly improves the performance and user experience of the electric hammer. This design not only improves the efficiency and accuracy of gear switching, but also enhances the stability and reliability of the electric hammer, so that it can adapt to different operation requirements and prolong the service life. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of the provided drawings.

[0030] Figure 1 It is a front structure schematic view of the electric hammer switching device of the present application.

[0031] Figure 2 It is a back structure schematic view of the electric hammer switching device of the present application.

[0032] Figure 3 It is a structure schematic view of the electric hammer switching device of the present application without a knob.

[0033] Figure 4Fig. 1 is a front view of the exploded structure of the electric hammer switching device of the present application;

[0034] Figure 5 Fig. 2 is a back view of the exploded structure of the electric hammer switching device of the present application;

[0035] Figure 6 Fig. 3 is a structural view of the shifting process of the electric hammer switching device of the present application;

[0036] Figure 7 Fig. 4 is a structural view of the first gear of the electric hammer switching device of the present application;

[0037] Figure 8 Fig. 5 is a structural view of the second gear of the electric hammer switching device of the present application;

[0038] Figure 9 Fig. 6 is a structural view of the cooperation between the electric hammer switching device and the driving assembly of the present application;

[0039] Figure 10 Fig. 7 is a structural view of the cooperation between the electric hammer switching device and the functional assembly of the present application;

[0040] Figure 11 Fig. 8 is another angle of the structural view of the cooperation between the electric hammer switching device and the functional assembly of the present application;

[0041] Figure 12 Fig. 9 is a structural view of the electric hammer of the present application;

[0042] Figure 13 Fig. 10 is a structural view of the exploded structure of the electric hammer of the present application.

[0043] Reference signs:

[0044] 100, electric hammer switching device; 1, sliding rod; 2, first shifting piece; 21, first shifting fork; 22, first side plate; 23, bottom plate; 24, second side plate; 3, second shifting piece; 31, second shifting fork; 4, locking piece; 41, locking tooth; 5, driving member; 51, first cam; 511, proximal end; 512, distal end; 52, second cam; 521, flat surface; 522, arc surface; 6, first elastic member; 7, second elastic member;

[0045] 200, driving assembly; 201, driving shaft; 202, spline; 203, driving gear; 204, swing bearing; 205, impact hammer;

[0046] 300, functional assembly; 301, drilling gear; 302, functional shaft;

[0047] 400, housing; 401, gear; 402, left housing; 403, right housing. DETAILED DESCRIPTION

[0048] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0049] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or integrally connected; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium, or can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0050] In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0051] The embodiments of the present application will be described in detail below with reference to the drawings. The features in the following embodiments can be combined with each other without conflict.

[0052] Embodiment 1

[0053] Please refer to Figures 1-8 The electric hammer switching device 100 provided by the embodiments of the present application includes a slide rod 1, a first shifting piece 2, a second shifting piece 3 and a driving member 5. The slide rod 1, the first shifting piece 2 and the second shifting piece 3 are all in sliding connection with the slide rod 1, the rotation axis of the driving member 5 is perpendicular to the axis of the slide rod 1, the driving member 5 includes a first cam 51 and a second cam 52, and the first cam 51 abuts against the first shifting piece 2 and the second shifting piece 3. This design can stably keep the first cam 51 and the second cam 52 of the driving member 5 in abutment with the first shifting piece 2 and the second shifting piece 3 at all times when the driving member 5 rotates, so as to realize the switching of gears. This design effectively reduces the risk of gear slipping caused by wear, looseness or working vibration, and improves the stability and reliability of gear switching.

[0054] Specifically, the slide rod 1 can be made of high-strength stainless steel material, which has good wear resistance and fatigue resistance. The first and second flaps 2 and 3 can be manufactured by stamping process, and aluminum alloy material can be selected, which is light and corrosion-resistant, or other metal plate materials can also be selected. The first and second cams 51 and 52 are integrated structures, which can reduce assembly errors and improve the matching precision between components. The first cam 51 has a distal end 512 and a proximal end 511, and the distance between the distal end 512 abutting surface and the rotation axis of the driving member 5 is greater than the distance between the proximal end 511 abutting surface and the rotation axis of the driving member 5. Such design can realize accurate gear switching. The second cam 52 has an arc surface 522 and a flat surface 521, the distal end 512 corresponds to the arc surface 522, and the proximal end 511 corresponds to the flat surface 521, which can realize the combination adjustment of the gears. The first and second cams 51 and 52 in the embodiment are integrated structures, and can also be connected as a whole by welding or fasteners according to needs.

[0055] Please refer to Figure 1 The driving member 5 is a knob, and the outer surface of the knob has an indication arrow, which is convenient for clearly indicating different gears.

[0056] Please refer to Figures 2-5 The first elastic member 6 is arranged on the slide rod 1, which makes the first cam 51 abut against the first and second flaps 2 and 3. The first elastic member 6 can be a spring, and the spring force can ensure that the first cam 51 always tightly abuts against the first and second flaps 2 and 3, and can maintain stable contact state even after long-term use. In addition, it also includes a lock piece 4 and a second elastic member 7, the lock piece 4 is in sliding connection with the slide rod 1, the lock piece 4 has a lock tooth 41, and the second elastic member 7 makes the second cam 52 abut against the lock piece 4. The first and second elastic members 6 and 7 are springs sleeved on the slide rod 1, the first elastic member 6 abuts against the first and second flaps 2 and 3, and the second elastic member 7 abuts against the second flap 3 and the lock piece 4. Under the joint action of the first and second elastic members 6 and 7, the first and second flaps 2 and 3 always abut against the first cam 51, and the lock piece 4 always abuts against the second cam 52.

[0057] The first flap 2 is integrally connected with a first yoke 21, and the second flap 3 is integrally connected with a second yoke 31. The first and second yokes 21 and 31 both have semicircular grooves for connecting with the function member to be driven.

[0058] Please refer to Figure 5 and Figure 6When the driving member 5 rotates, the distal end 512 of the first cam 51 pushes the first finger 2, the second finger 3 and the lock piece 4 to slide along the slide rod 1, so as to realize the movement of the first finger 2, the second finger 3 and the lock piece 4 to drive the corresponding function member to realize different clutch gears. Because the arc surface 522 of the second cam 52 is a circular arc with the rotation axis of the driving member 5 as the center, when the arc surface 522 of the second cam 52 abuts against the lock piece 4, the lock piece 4 does not slide. When the abutting position of the second cam 52 and the lock piece 4 is switched from the arc surface 522 to the flat surface 521, the lock piece 4 slides quickly to realize the switching of the lock function.

[0059] Please refer to Figures 6-8 The first finger 2 has a first side plate 22, a second side plate 24 and a bottom plate 23 connecting the first side plate 22 and the second side plate 24, forming an integrated U-shaped structure. This structure not only increases the rigidity of the first finger 2, but also makes the force more evenly distributed when it is stressed, prolonging the service life. There is a self-locking gap between the abutting surface of the proximal end 511 and the bottom plate 23, and when the distal end 512 abuts against the first side plate 22 and the bottom plate 23 at the same time or the distal end 512 abuts against the second finger 3 and the bottom plate 23 at the same time, the self-locking state is realized. This means that under certain conditions, the first finger 2 will be automatically locked at a certain position to prevent accidental movement, increasing the safety of use.

[0060] Please refer to Figure 6 In the direction shown in the figure, the first cam 51 pushes the second finger 3 to move to the left, and the second finger 3 drives the second finger fork 31 to move to the left to drive the related function gear linked with the second finger fork 31 to move, realizing the function conversion. When the distal end 512 abuts against the second finger 3 and the bottom plate 23, because the proximal end 511 always has a distance from the bottom plate 23, at this position, the center line of the first cam 51 has an angle with the bottom plate 23, and the second finger 3 will exert a torque on the first cam 51 in the direction of the bottom plate 23, because the distal end 512 cannot rotate when it abuts against the bottom plate 23, so the self-locking can be realized. When the driving member 5 rotates to overcome the torque of the self-locking, the self-locking state can be released to adjust the gear.

[0061] Please refer to Figure 7 In the direction shown in the figure, the first finger 2 and the second finger 3 are closest to the rotation center of the driving member 5, and in this state, the distal end 512 needs to overcome the elastic force of the spring to push the first finger 2 or the second finger 3, so it also has a stable locking state.

[0062] Please refer to Figure 8 When the distal end 512 abuts against the first side plate 22 and the bottom plate 23 to realize self-locking, the principle is the same as Figure 6 It is explained that the first side plate 22 will exert a torque on the first cam 51 in the direction of the bottom plate 23. This two-way self-locking mechanism greatly enhances the stability of gear switching.

[0063] The function of the locking piece 4 is to further fix the gear in some special cases, enhancing the reliability of the entire system.

[0064] The implementation principle of this embodiment is to achieve high stability and reliability of electric hammer gear shifting through the integrated design of the first cam 51 and the second cam 52, as well as the unique self-locking mechanism. This design not only reduces the risk of slipping gears in traditional gear shifting devices, but also simplifies the user's operation process and improves the overall user experience. Especially for professional workers who need to frequently change work environments and task types, this design is undoubtedly a great improvement, which helps to improve work efficiency and work quality.

[0065] Embodiment 2

[0066] Please refer to Figure 9 The difference between this embodiment and embodiment 1 is that it also includes a drive assembly 200, which includes a drive shaft 201 and a spline 202 and a drive gear 203 connected with the drive shaft 201. The drive shaft 201 can drive the spline 202 and the drive gear 203 to rotate synchronously. The axis of the slide rod 1 is parallel to the axis of the drive shaft 201. The first shift fork 21 is rotationally connected with the spline 202 and can drive the spline 202 to slide along the drive shaft 201 synchronously. The second shift fork 31 is rotationally connected with the drive gear 203 and can drive the drive gear 203 to slide along the drive shaft 201 synchronously. Therefore, by changing the positions of the first shift piece 2 and the second shift piece 3, the positions of the spline 202 and the drive gear 203 can be adjusted to achieve the switching of different gears.

[0067] Embodiment 3

[0068] Please refer to Figure 10 and Figure 11 The difference between this embodiment and embodiment 2 is that it also includes a function assembly 300, which includes a function shaft 302 and a drill gear 301 arranged on the function shaft 302. The swing bearing 204 has an inner spline tooth that matches the spline 202. When the electric hammer switching device 100 makes the spline 202 slide and connect with the swing bearing 204, the spline 202 drives the swing bearing 204 to rotate, and the swing bearing 204 drives the impact hammer 205 to swing and impact the function shaft 302. When the spline 202 is disconnected from the swing bearing 204, the swing bearing 204 does not rotate, and the impact hammer 205 does not swing and impact. The axis of the drive shaft 201 is parallel to the axis of the function shaft 302.

[0069] When the electric hammer switching device 100 moves the driving gear 203 to engage with the drill gear 301, the driving gear 203 drives the drill gear 301 to rotate, and the drill gear 301 synchronously drives the function shaft 302 to rotate, and the function shaft 302 connected with the drill bit can realize the rotating work of the drill bit. When the driving gear 203 is disengaged from the drill gear 301 after slipping, the function shaft 302 stops rotating.

[0070] When the spline 202 is connected with the swing bearing 204, and the driving gear 203 is engaged with the drill gear 301, the function shaft 302 realizes both rotating and impact work. Through different control of the electric hammer switching device 100, different combined functions can be realized, and the control is simple, and the gear switching is accurate and reliable.

[0071] Embodiment 4

[0072] Please refer to Figure 12 and Figure 13 The embodiment discloses a handheld tool, specifically an electric hammer, which comprises a shell 400, wherein the electric hammer switching device 100, the driving assembly 200 and the function assembly 300 are arranged in the shell 400, and the function shaft 302 extends out of the shell 400, facilitating the insertion of different drill bits. The shell 400 is provided with gear position 401 marks, and the driving member 5 is rotatably connected with the shell 400. When the driving member 5 rotates, the arrow on the driving member 5 can correspond to the gear position 401 on the shell 400, facilitating the realization of different gear functions through control. The shell 400 comprises a left shell 402 and a right shell 403, and the left shell 402 and the right shell 403 are fixed as a whole through buckles or screws.

[0073] The above describes the electric hammer switching device in detail. The principle and implementation mode of the utility model are described by applying specific examples in the paper, and the above embodiment is only used to help understand the method and core idea of the utility model. It should be pointed out that for ordinary skilled persons in the technical field, some improvements and modifications can be made to the utility model without departing from the principle of the utility model, and these improvements and modifications also fall within the protection scope of the utility model claims.

Claims

1. An electric hammer switching device characterized by comprising: The device comprises a slide rod, a first shifting piece, a second shifting piece and a driving member, the slide rod, the first shifting piece and the second shifting piece are in sliding connection with the slide rod, the rotation axis of the driving member is perpendicular to the axis of the slide rod, the driving member comprises a first cam and a second cam, the first cam is in abutment with the first shifting piece and the second shifting piece, and at least one cooperation position between the first cam and the first shifting piece or the second shifting piece is in self-locking state during the rotation of the driving member.

2. The hammer switching device according to claim 1, wherein The first cam has a distal end and a proximal end, the distance between the distal end abutment surface and the rotation axis of the driving member is greater than the distance between the proximal end abutment surface and the rotation axis of the driving member, the second cam has a curved surface and a flat surface, the distal end corresponds to the curved surface, and the proximal end corresponds to the flat surface.

3. The hammer switching device according to claim 2, wherein The first cam and the second cam are in one-piece structure.

4. An electric hammer switching device according to claim 2 or 3, characterized in that, The first shifting piece has a first side plate, a second side plate and a bottom plate connecting the first side plate and the second side plate, and the first side plate, the second side plate and the bottom plate are in one-piece U-shaped structure.

5. The hammer switching device according to claim 4, wherein The abutment surface of the proximal end and the bottom plate have a self-locking gap, and self-locking is achieved when the distal end is in abutment with the first side plate and the bottom plate at the same time or the distal end is in abutment with the second shifting piece and the bottom plate at the same time.

6. The hammer switching device according to claim 4, wherein When the distal end is in abutment with the first side plate and the bottom plate at the same time to achieve self-locking, the first side plate applies a torque to the first cam to rotate in the direction of the bottom plate; when the distal end is in abutment with the second shifting piece and the bottom plate at the same time to achieve self-locking, the second shifting piece applies a torque to the first cam to rotate in the direction of the bottom plate.

7. The hammer switching device according to claim 1, wherein A first elastic member is arranged on the slide rod, which keeps the first cam in abutment with the first shifting piece and the second shifting piece.

8. The hammer switching device according to claim 1, wherein A lock piece and a second elastic member are further included, the lock piece is in sliding connection with the slide rod, the lock piece has a lock tooth, and the second elastic member keeps the second cam in abutment with the lock piece.

9. An electric hammer, characterized by The device comprises the electric hammer switching device according to any one of claims 1-8.

10. The hammer drill of claim 9, wherein, A housing and a driving shaft are further included, the axis of the slide rod and the axis of the driving shaft are arranged in parallel, the driving member is arranged in rotation on the housing, a spline and a driving gear are in sliding connection on the driving shaft, the first shifting piece is in rotational connection with the spline and moves synchronously in the direction of the axis of the driving shaft, and the second shifting piece is in rotational connection with the driving gear and moves synchronously in the direction of the axis of the driving shaft.

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