Gear shifting lock gear gasket and gear structure based on light electric hammer

Abstract

The utility model discloses a gear shifting lock gear gasket and gear structure based on a light electric hammer, which is arranged in a rotary driving part and is matched with a rotary main gear of the rotary driving part, and the lock gear gasket consists of a lock gear gasket main body, a lock tooth hole which is arranged on the lock gear gasket main body and penetrates through the lock gear gasket main body from front to back, and a lock tooth hole which is arranged on the lock gear gasket main body, the upper opening is formed in the lock gear gasket body, and the elastic piece is arranged on the lock gear gasket body. And the upper opening is downwards communicated with the lock tooth hole and upwards penetrates through the lock tooth wheel gasket main body. According to the gear-shifting lock gear gasket and the gear structure based on the light electric hammer, on the premise that the shape of a product is kept unchanged, the tooth number ratio of a rotating pinion to a rotating main gear is adjusted to be 13: 42, the output rotating speed of the product is increased, meanwhile, the structure of the lock gear gasket is optimized, the size of the lock gear gasket is not increased, and the service life of the lock gear gasket is prolonged. According to the swing bearing pressing device, the main gear can be effectively matched and rotated, normal operation of a product cannot be affected, the U-shaped lower pressing plate is additionally arranged, and the pressing effect on a swing bearing is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electric hammer structure, in particular to the gear spacer and gear structure of shift lock based on light electric hammer. BACKGROUND

[0002] Electric hammer is a kind of widely used electric tool, which is based on electric drill, increases a piston driven by electric motor with crankshaft connecting rod, so that the hammer reciprocatingly strikes the top of drill bit, which is equivalent to knocking the drill bit with hammer, so it is named electric hammer.

[0003] Electric hammer is a kind of electric drill, which is mainly used for drilling holes in concrete, floor, brick wall and stone. It is professional in wall, concrete and stone drilling, and can also be used as multifunctional electric hammer. By adjusting to the appropriate position and matching with appropriate drill bit, it can replace ordinary electric drill and electric pick.

[0004] Because the drill bit of electric hammer produces rapid reciprocating motion (frequent impact) along the direction of electric drill rod while rotating, it can quickly drill holes in brittle cement concrete and stone materials. High-end electric hammer can use a switch to make the drill bit of electric hammer in different working states, i.e. only rotating, only impacting, only rotating and impacting.

[0005] At present, the most widely used and best-selling electric hammer on the market has two groups of gears with the following gear ratios: the first group, the gear ratio of the output gear of the driving motor to the motor auxiliary shaft is 7:33 or 6:28 or 7:38; the second group, the gear ratio of the rotating main gear to the rotating auxiliary gear is 9:40. Through the feedback of users, this product mainly has two problems: (1) the rotation speed of the electric hammer with this gear ratio is too low when only rotating without impacting, which greatly affects the drilling efficiency; (2) the contact surface between the U-shaped upper pressing plate and the swing bearing is too small, which is easy to deform and cause displacement during use, ultimately making it unable to complete the pressing of the swing bearing. CONTENT OF THE INVENTION

[0006] In view of the deficiencies of the prior art, the present application provides a gear spacer and gear structure of shift lock based on light electric hammer, which adjusts the gear ratio of the rotating auxiliary gear to the rotating main gear to 13:42 under the premise of keeping the product size unchanged, improves the output rotation speed of the product, and optimizes the structure of the lock gear spacer, so that the volume of the lock gear spacer does not increase, which can effectively adapt to the rotating main gear and will not affect the normal operation of the product.

[0007] The gear pad of the shift lock of the light electric hammer is arranged in the rotary driving part and matched with the rotating main gear of the rotary driving part, and the lock gear pad is composed of a lock gear pad body, a lock gear hole arranged on the lock gear pad body and penetrating through the lock gear pad body, an upper opening arranged on the lock gear pad body, and an elastic sheet arranged on the lock gear pad body; the upper opening is communicated with the lock gear hole downward and penetrates through the lock gear pad body upward.

[0008] The number of the tooth openings in the lock gear hole is 13, 12, 11, 10, 9, 8, 7 or 6.

[0009] The hammer driving part adjacent to the rotary driving part is provided with a U-shaped lower pressing plate and a U-shaped upper pressing plate pressed on the U-shaped lower pressing plate.

[0010] The number of the teeth of the rotating main gear is 13, and the number of the teeth of the rotating secondary gear engaged with the rotating main gear is 42.

[0011] On the premise that the ratio of the number of the teeth of the output gear of the driving motor to the number of the teeth of the motor secondary gear shaft is 7:33 or 6:28 or 7:38, the ratio of the number of the teeth of the rotating main gear to the number of the teeth of the rotating secondary gear is adjusted from 9:40 to 13:42.

[0012] As a preferred, the elastic sheet is L-shaped, and the short side end of the elastic sheet is fixed on the side wall of the upper opening.

[0013] As a preferred, the width of the upper opening is greater than or equal to the width of one tooth opening at the upper end of the lock gear hole.

[0014] Compared with the prior art, the embodiment has the following beneficial effects:

[0015] The utility model discloses under the premise of keeping the product body unchanged, the ratio of the number of the teeth of the rotating secondary gear to the number of the teeth of the rotating main gear is adjusted to 13:42, improves the rotation of the product output, and simultaneously optimizes the lock gear pad structure, so that the volume of the lock gear pad is not increased, can effectively adapt the rotating main gear, will not cause the influence to the normal operation of the product, still increases the U-shaped lower pressing plate, guarantees the pressing effect to the swing bearing.

[0016] Part of the additional features of the present application can be described in the following description. Part of the additional features of the present application are obvious to those skilled in the art through the examination of the following description and corresponding drawings or the understanding of the production or operation of the embodiments. The features disclosed in the present application can be realized and achieved through the practice or use of various methods, means and combinations of the specific embodiments described below. BRIEF DESCRIPTION OF DRAWINGS

[0017] The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:

[0018] Figure 1 The structure schematic view of the utility model.

[0019] Figure 2 The structure schematic view of the utility model removes the middle seat.

[0020] Figure 3 The front view of the utility model swing shaft.

[0021] Figure 4 The perspective view of the utility model swing shaft.

[0022] Figure 5 The structure schematic view of the utility model lock tooth gasket.

[0023] Figure 6 The structure schematic view of the utility model motor secondary pinion shaft.

[0024] Figure 7 The structure schematic view of the utility model rotary shaft and the rotation main gear on it.

[0025] Figure 8 The front view of the utility model rotation secondary gear.

[0026] The structure schematic view of the utility model removes the middle seat. DETAILED DESCRIPTION

[0027] In order to make the personnel in the technical field better understand the scheme of the present application, the technical scheme in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor should fall within the scope of protection of the present application.

[0028] It should be noted that if the terms "first", "second" and the like are involved in the description and claims of the present application and the above drawings, they are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented. In addition, if the terms "include" and "have" and any variations thereof are involved, it is intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not necessarily limit to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0029] In the present application, if the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like are involved, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0030] Also, in addition to indicating orientation or positional relationship, the above-mentioned part of the terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain dependent relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meaning of these terms in the present application can be understood according to the specific circumstances.

[0031] In addition, in the present application, if the terms "mounting", "setting", "provided with", "connecting", "connected", "sleeved" and the like are involved, they should be understood broadly. For example, it can be fixedly connected, detachably connected, or integrally constructed; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be internal communication between two devices, elements or components. For those of ordinary skill in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific circumstances.

[0032] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0033] Embodiment 1

[0034] As shown in Figure 1 , 2 , the gear pad and gear structure based on the gear shifting lock of the light electric hammer comprises a middle seat 100 and a driving motor arranged in the shell of the electric hammer, a drill hammer part 200 arranged on the middle seat 100, a hammer driving part 300 arranged on the middle seat 100, and a rotation transmission part 400 connected with the hammer driving part 300. The hammer driving part 300 is connected with the tail part of the drill hammer part 200, and the rotation transmission part 400 is also connected with the drill hammer part 200. A motor secondary pinion shaft 500 connected with the driving motor is further arranged in the middle seat 100, and the motor secondary pinion shaft 500 is connected with the hammer driving part 300 and / or the rotation transmission part 400.

[0035] The electric hammer is a prior art, and the shell (not shown in the figure), the middle seat and the driving motor of the electric hammer are mature structures in the art, and the arrangement of the shell, the middle seat and the driving motor of the electric hammer can be completed by the skilled person without creative labor, and the present application does not adjust and improve the above-mentioned structures, so no further description is given here.

[0036] The drill hammer part 200 is composed of a drill hammer main body 210 and a rotation secondary gear 220 sleeved on the drill hammer main body 210. The rotation secondary gear 220 is integrated with the drill hammer main body 210. The rotation secondary gear 220 is a forty-two-tooth gear.

[0037] As shown in Figure 6 , the motor secondary gear 500 is composed of a motor secondary gear 510 engaged with a motor primary gear on the driving motor, a motor secondary gear shaft 520 coaxially arranged at the rear end of the motor secondary gear 510 and integrated with the motor secondary gear 510, and a swing shaft driving tooth 530 and a rotation driving tooth 540 arranged at the front end of the motor secondary gear shaft 520. The motor secondary gear shaft 520 is in the shape of a circular tube. The swing shaft driving tooth 530 is arranged on the outer side surface of the front end of the motor secondary gear shaft 520, and the rotation driving tooth 540 is arranged on the inner side surface of the front end of the motor secondary gear shaft 520.

[0038] The hammer driving part 300 is composed of a swing bearing 350 arranged in the middle seat 100, a swing shaft 310 arranged in the swing bearing 350, a hammer bearing 320 sleeved on the outer side of the swing shaft 310, a U-shaped lower pressing plate 330 sleeved on the outer side of the swing shaft 310, and a U-shaped upper pressing plate 340 arranged on the middle seat 100 and pressed on the U-shaped lower pressing plate 330.

[0039] AsFigure 3 , 4 As shown, the rocker shaft 310 consists of a hollow rocker shaft body 311, a ball bearing positive ring groove 313 disposed on the rear of the outer side wall of the rocker shaft body 311, a ball bearing oblique ring groove 312 disposed on the front middle of the outer side of the rocker shaft body 311, and a rocker shaft driven tooth 314 disposed on the inner side wall of the rocker shaft body 311; the hammer bearing 330 is disposed in the ball bearing oblique ring groove 312, and the rocker bearing 350 is disposed in the ball bearing positive ring groove 313; the rocker shaft driven tooth 314 matches the rocker shaft driving tooth 530.

[0040] The U-shaped lower pressure plate 330 is U-shaped and presses against the front end face of the rocker bearing 350; the U-shaped upper pressure plate 340 is U-shaped and is inclinedly disposed on the middle seat 100, the end of the U-shaped upper pressure plate 340 presses against the U-shaped lower pressure plate 330 and the U-shaped upper pressure plate 340 presses the U-shaped lower pressure plate 330 tightly against the front end face of the rocker bearing 350.

[0041] Because of the U-shaped lower pressure plate and the larger contact area between the U-shaped lower pressure plate and the U-shaped upper pressure plate, the U-shaped upper pressure plate can still press against the U-shaped lower pressure plate even when the U-shaped upper pressure plate deforms or even shifts. This ensures that the U-shaped lower pressure plate can effectively press down on the rocker bearing and effectively reduces the maintenance frequency of the product.

[0042] When the driven tooth of the oscillating shaft meshes with the driving tooth of the oscillating shaft, the oscillating shaft will rotate with the motor's secondary gear shaft, and the upper end of the hammer bearing will reciprocate back and forth. Driven by the upper end of the hammer bearing, the drill hammer body will also reciprocate back and forth, thus achieving the hammering effect. When the driven tooth of the oscillating shaft disengages from the driving tooth of the oscillating shaft, the oscillating shaft will stop rotating, and the drill hammer body will also stop reciprocating back and forth.

[0043] The rotary drive unit 400 consists of a rotary shaft 410 with a rotary driven tooth at the rear end, a needle roller bearing 420 sleeved on the front end of the rotary shaft 410, a rotary main gear 440 fixed on the rotary shaft 410, and a locking gear washer 430 disposed between the needle roller bearing 420 and the rotary main gear 440; the rotary main gear 440 meshes with the rotary secondary gear 220, and the rotary main gear 440 is a thirteen-tooth gear; the locking gear washer 430 is fixed on the electric hammer housing; the rotary driven tooth matches the rotary driving tooth 540.

[0044] like Figure 7 , 8 As shown, by adjusting the gear ratio of the main gear to the auxiliary gear from 9:40 to 13:42, the rotational speed of the drill hammer body is effectively increased without changing the gear ratio of the first set of gears in the existing electric hammer (7:33, 6:28, or 7:38).

[0045] When the rotating driven teeth are engaged with the rotating driving teeth, the rotating shaft will rotate with the motor pinion shaft, and then drive the rotating master gear to rotate, the rotating master gear drives the rotating pinion gear to rotate, and finally the drill hammer body also rotates; when the rotating driven teeth are disengaged from the rotating driving teeth, the rotating shaft no longer rotates, and the drill hammer body also stops rotating.

[0046] As shown in Figure 5 The lock gear gasket 430 is composed of a lock gear gasket body 431, a lock tooth hole 432 provided on the lock gear gasket body 431 and extending through the lock gear gasket body 431 from front to back, an upper opening 433 provided on the lock gear gasket body 431, and a spring piece 434 provided on the lock gear gasket body 431; the upper opening 433 is connected with the lock tooth hole 432 downward and extends through the lock gear gasket body 431 upward.

[0047] The spring piece 434 is L-shaped, and the short edge end of the spring piece 434 is fixed on the side wall of the upper opening 433, and the long edge of the spring piece 434 is parallel to the needle bearing 420 and abuts against the end of the needle bearing 420.

[0048] The spring piece can effectively limit the needle bearing, avoid the needle bearing from sliding along the rotating shaft during product operation, and greatly improve the stability of the needle bearing.

[0049] The width of the upper opening 433 is greater than or equal to the width of one tooth at the upper end of the lock tooth hole 432.

[0050] If the meshing hole with the same shape as the rotating master gear is provided on the lock gear gasket body, the width of the lock gear gasket body will be too wide, and the too wide lock gear gasket body will affect the normal operation of the drill hammer body. By providing the upper opening on the lock tooth hole, the lock tooth hole can be matched and matched with the rotating master gear, and the width of the lock gear gasket body can be avoided. The number of tooth openings in the lock tooth hole is greater than 6, which can effectively lock the rotating master gear. The more the number of tooth openings in the lock tooth hole, the better the locking effect and the longer the service life, so the width of the upper opening and the lock tooth hole can be selected according to the actual internal space of the product, but generally the number of tooth openings should not be less than 6.

[0051] When the rotating driven teeth are disengaged from the rotating driving teeth, the rotating master gear will be pushed into the lock tooth hole, and the lock tooth hole can complete the limiting of the rotating master gear, avoid the rotating master gear from rotating when the drill hammer body is hammering, and better avoid the rotating master gear and the rotating pinion gear from colliding with each other, and reduce the damage of the rotating master gear and the rotating pinion gear due to collision when hammering.

[0052] The improved mode of the embodiment can increase the rotating speed of the rotating driving part by about 40%, and can increase the use efficiency of the product by 20-30% without affecting the service life of the product.

[0053] The operation principles of different modes of the product are as follows:

[0054] (1) Hammer drill mode: the driving teeth of the motor secondary gear mesh with the driven teeth of the hammer driving part, and the rotating driving part is driven by the rotating teeth of the motor secondary gear. When the motor secondary gear rotates with the driving motor, the hammer driving part and the rotating driving part rotate synchronously, the hammer driving part drives the hammer part to reciprocate, and the rotating driving part drives the hammer part to rotate, so that the hammer part can rotate and hammer at the same time.

[0055] (2) Hammer mode (electric hammer mode): the driving teeth of the motor secondary gear mesh with the driven teeth of the hammer driving part, and the rotating driving part is driven by the rotating teeth of the motor secondary gear. When the motor secondary gear rotates with the driving motor, the hammer driving part rotates, the hammer driving part drives the hammer part to reciprocate, and the rotating driving part does not rotate because the rotating teeth of the motor secondary gear are disengaged from the rotating driving part, so that the hammer part does not rotate.

[0056] (3) Drill mode (electric drill mode): the rotating driving part is driven by the rotating teeth of the motor secondary gear. When the motor secondary gear rotates with the driving motor, the rotating driving part rotates, and the hammer part rotates because the hammer driving part is disengaged from the motor secondary gear, so that the hammer part does not reciprocate.

[0057] It should be noted that all the features disclosed in the specification, or the steps in all the methods or processes disclosed, can be combined in any manner, except for mutually exclusive features and / or steps.

[0058] In addition, the above specific embodiments are exemplary, and those skilled in the art can think of various solutions under the inspiration of the disclosure of the utility model, and these solutions also belong to the disclosed range of the utility model and fall within the protection scope of the utility model. Those skilled in the art should understand that the utility model specification and its drawings are all illustrative and do not constitute a limitation on the claims. The protection scope of the utility model is defined by the claims and their equivalents.

Claims

1. A shift lock gear spacer and gear structure based on a light electric hammer, provided in a rotary driving part (400) and cooperating with a rotating main gear (440) of the rotary driving part (400), characterized in that, The lock gear gasket (430) is composed of a lock gear gasket body (431), a lock tooth hole (432) arranged on the lock gear gasket body (431) and penetrating through the lock gear gasket body (431) from front to back, an upper opening (433) arranged on the lock gear gasket body (431), and an elastic sheet (434) arranged on the lock gear gasket body (431); the upper opening (433) is connected with the lock tooth hole (432) downward and penetrates through the lock gear gasket body (431) upward; The number of the inner tooth openings of the lock tooth hole (432) is 13, 12, 11, 10, 9, 8, 7 or 6; A U-shaped lower pressing plate (330) and a U-shaped upper pressing plate (340) pressed on the U-shaped lower pressing plate (330) are arranged on the hammer driving part (300) adjacent to the rotary driving part (400); The number of teeth of the rotary main gear (440) is 13, and the number of teeth of the rotary secondary gear (220) engaged with the rotary main gear (440) is 42; On the premise that the number ratio of the output gear of the driving motor to the gear shaft of the motor secondary gear in the first group of gears is 7:33 or 6:28 or 7:38, the number ratio of the rotary main gear (440) to the rotary secondary gear (220) in the second group of gears is adjusted from 9:40 to 13:

42.

2. The shift lock gear spacer and gear structure based on a light electric hammer according to claim 1, characterized by, The elastic sheet (434) is L-shaped, and the short edge end of the elastic sheet (434) is fixed on the side wall of the upper opening (433).

3. The shift lock gear spacer and gear structure based on a light electric hammer according to claim 1, characterized by, The width of the upper opening (433) is greater than or equal to the width of one tooth opening at the upper end of the lock tooth hole (432).

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