CN217195153U

CN217195153U - Function switching structure of light electric hammer

Info

Publication number: CN217195153U
Application number: CN202122402493.XU
Authority: CN
Inventors: 张红松; 刘德昌; 周大华
Original assignee: Zhejiang Dongli Electric Appliance Co ltd
Current assignee: Zhejiang Dongli Electric Appliance Co ltd
Priority date: 2021-10-07
Filing date: 2021-10-07
Publication date: 2022-08-16
Anticipated expiration: 2031-10-07

Abstract

The invention discloses a function switching structure of a light electric hammer, which comprises a shifting fork, an operating piece, a locking piece, a gear switching component and a transmission component, wherein the shifting fork is arranged on the operating piece; the range switching assembly includes: a mid-shaft assembly; a clutch which is circumferentially linked with the intermediate shaft component and can axially displace; the clutch gear fitting piece is sleeved at the first end of the intermediate shaft assembly; the swing rod bearing fitting piece is sleeved at the second end of the intermediate shaft assembly; the shifting fork is connected to the clutch, the operating part is used for controlling the shifting fork and the locking piece to move, and the locking piece is located at a specific position and limits the transmission assembly to axially reciprocate but not circumferentially rotate; the clutch is driven to be in different positions through different states of the operating piece, and therefore different functions are switched.

Description

Function switching structure of light electric hammer

Technical Field

The invention relates to the technical field of electric tools, in particular to a function switching structure of a light electric hammer.

Background

Along with the increasing development of economy, the electric hammer is also more and more used, and the electric hammer is widely applied to workplaces such as building industry, decoration industry, social service industry, industrial and mining enterprises, and is provided with a function switching device for conveniently realizing the function switching of the drilling gear, the hammer gear, the neutral gear and the pick gear of the electric hammer.

However, the existing multifunctional switching electric hammer has the following defects: firstly, a function switching device is generally realized by two knobs, namely two clutches which are independently controlled are arranged on a gear switching structure, the structure requires a user to have certain operation knowledge and use experience, and the problems of complex structure, high assembly precision requirement, poor reliability and short service life exist; and secondly, the part for locking the angle adjustment is usually designed with one of the shifting forks as a whole, and the torsional springs for controlling the two groups of different shifting forks cannot completely realize the stability of the flexible force, so that the operation is hard, the operation is not smooth and the hand feeling is not good during the shifting process.

Therefore, many scientific research units and manufacturers develop and develop the products, but no ideal products are available.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a function switching structure of a light electric hammer, which can effectively solve the problems of the existing function switching type electric hammer.

The technical scheme adopted by the invention for solving the technical problems is as follows: a function switching structure of a light electric hammer comprises a shifting fork, an operating piece, a locking piece, a gear switching assembly and a transmission assembly;

the range switching assembly includes: a mid-shaft assembly; a clutch which is circumferentially linked with the intermediate shaft component and can axially displace; the clutch gear fitting piece is sleeved at the first end of the intermediate shaft component; the swing rod bearing fitting piece is sleeved at the second end of the intermediate shaft assembly;

the shifting fork is connected to the clutch, the operating part is used for controlling the shifting fork and the locking piece to move, and the locking piece is located at a specific position and can limit the transmission assembly to only axially reciprocate but not circumferentially rotate;

the clutch is driven to be in different positions through different states of the operating piece, and therefore different functions are switched.

In the above technical solution, further, a fork pin is further included, which is used for being inserted on the fork and the locking piece at the same time; the operating part comprises a rotating shaft, an eccentric shaft and a cam sheet; the locking piece is arranged on the shifting fork pin and can move along the axial direction of the shifting fork pin to form circumferential locking of the transmission assembly; and a compression spring is further arranged on the shifting fork pin, two ends of the compression spring are respectively abutted between the locking piece and the shifting fork, and the locking piece is provided with a force which is always abutted against the cam piece.

In the above technical solution, further, a torsion spring is fixedly mounted on the shift fork, and an eccentric shaft of the operating element is located between two end pins of the torsion spring, so that the stroke of the locking piece is controlled by the cam piece, and the stroke of flexible cutting-in of the shift fork is controlled by matching the eccentric shaft and the torsion spring.

In the technical scheme, furthermore, the intermediate shaft assembly comprises an intermediate shaft and a positioning sleeve arranged in the middle of the intermediate shaft, a first gear is further arranged at the second end of the intermediate shaft assembly and is always meshed with a gear of the motor, a second gear is arranged on the clutch gear fitting piece and is used for driving the middle end of the transmission assembly, a swing rod bearing is arranged on the swing rod bearing fitting piece and is used for driving the transmission assembly to axially reciprocate.

Among the above-mentioned technical scheme, further, when operating parts is in the first state, the shift fork drives the clutch is in the first position, separation and reunion gear fitting piece with jackshaft subassembly realizes the linkage, is boring the shelves this moment.

Among the above-mentioned technical scheme, further, when the operating parts is in the second state, the shift fork drives the clutch is in the second position, clutch gear fitting piece, swing rod bearing fitting piece, jackshaft subassembly realize the linkage, are the hammer drill shelves this moment.

Among the above-mentioned technical scheme, further, when the operating parts is in the third state, the shift fork drives the clutch is in the third position, pendulum rod bearing fitting piece with jackshaft subassembly realizes the linkage, the locking plate with transmission assembly contactless is the flat chisel angle adjustment shelves this moment.

In the above technical scheme, further, when the operating part is in the fourth state, the shift fork drives the clutch is in the fourth position, the swing rod bearing fitting piece with the jackshaft subassembly realizes the linkage, the locking plate locks the transmission assembly, this moment is the hammer shelves.

The invention has the beneficial effects that:

1. the shifting fork and the locking piece can be simultaneously controlled through an operating piece of a double-shaft cam eccentric structure, so that the switching of a hammer gear (simultaneously locking an angle), a drilling gear and a hammer drilling gear is realized; the matching structure is greatly simplified, the stability is better, and the gear shifting operation is smooth and stable.

2. In the switching process, due to the action of the torsion spring and the compression spring, the switching-in process of the clutch and the locking piece is relatively flexible, the gear shifting work is stable and smooth, and the use function and the operation hand feeling are good. Meanwhile, the locking piece and the shifting fork are linked, bidirectional flexible cutting is realized, and the flat chisel locking function can be completed by one action.

3. The torsion spring is fixedly assembled with the shifting fork, the assembly is simple, the use is reliable, the torsion spring is positioned through two directions, the fixation is stable, and the installation position is correct.

Drawings

The invention is further illustrated by the following examples in conjunction with the drawings.

Fig. 1 is an exploded view of the structure of the present invention.

Fig. 2 is an exploded view of the shift position switching assembly of the present invention.

Fig. 3 is a schematic diagram of the internal structure of the hammer drill stop of the present invention.

Fig. 4 is a schematic view of the internal structure of the hammer rail of the present invention.

FIG. 5 is a schematic diagram of the internal structure of the drill collar of the present invention.

FIG. 6 is a schematic view of the structural mounting of the fork assembly, the operating member and the housing of the present invention.

FIG. 7 is a schematic view of the structure of the shift position switching assembly and the operating member, the shift fork, and the locking plate of the present invention.

Fig. 8 is another angular configuration of fig. 7 of the present invention.

Fig. 9 is a schematic view of an installation structure of the shift fork and the torsion spring of the present invention.

Fig. 10 is another angular configuration of fig. 9 of the present invention.

In the figure, 1, a motor, 2, a transmission assembly, 21, a rotation output end, 211, a third gear, 22, a reciprocating output end, 3, a gear shifting assembly, 31, an intermediate shaft assembly, 311, an intermediate shaft, 312, a positioning sleeve, 313, a first gear, 32, a clutch, 33, a clutch gear matching piece, 331, a second gear, 34, a swing rod bearing matching piece, 4, an operating piece, 41, a rotating shaft, 42, an eccentric shaft, 43, a cam plate, 5, a shifting fork, 51, an insertion part, 52, a first fixing part, 521, a first axis, 522, a blocking part, 53, a second fixing part, 531, a limiting groove, 54, a positioning hole, 6, a locking piece, 61, a tooth part, 62, 7, a compression spring, 8, a torsion spring, 81, a pin, 9, a shifting fork pin, 10, a shell and 11 a knob.

Detailed Description

Referring to fig. 1-10, a specific embodiment of the invention is shown: an electric hammer is capable of realizing flexible switching of different functions. Mainly comprises the following components: a motor 1 for providing a power source; the end part of the transmission component 2 can be detachably provided with different drill hammer heads or flat chisel heads according to different working condition requirements, meanwhile, the front end of the transmission component 2 is a rotary output end 21, the rear end of the transmission component 2 is a reciprocating output end 22, and the rotary output end and the reciprocating output end are matched with each other to realize the hammer drill function, which is the existing design in the field and is not described herein in detail; the gear shifting assembly 3, which is a middle connection part between the motor 1 and the transmission assembly 2, can convert the rotation output of the motor 1 into different actions to the transmission assembly 2. This gear shifting assembly 3 specifically includes: an intermediate shaft assembly 31; a clutch 32 which is circumferentially linked to the intermediate shaft assembly 31 and is axially displaceable; a clutch gear fitting 33 sleeved on the first end of the intermediate shaft assembly 31; and the swing rod bearing fitting piece 34 is sleeved at the second end of the intermediate shaft component 31. The intermediate shaft assembly 31 comprises an intermediate shaft 311 and a positioning sleeve 312 arranged in the middle of the intermediate shaft 311, a first gear 313 is further arranged at the second end of the intermediate shaft assembly 31 and is always meshed with a gear of the motor 1, a second gear 331 is arranged on the clutch gear fitting 33, the second gear 331 is meshed with a third gear 211 arranged at the rotation output end 21 of the transmission assembly 2, a swing rod bearing is arranged on the swing rod bearing fitting 34, and a swing rod of the swing rod bearing is connected to the reciprocating output end 22 of the transmission assembly 2. Meanwhile, the inner ring of the clutch 32 is provided with an internal spline, and the outer rings of the clutch gear fitting 33, the positioning sleeve 312 and the swing rod bearing fitting 34 are provided with an external spline which can be matched with the internal spline.

As regards the functional switching of the gearshift switching assembly 3: the operating piece 4 specifically comprises a rotating shaft 41, an eccentric shaft 42 and a cam plate 43, and the operating piece 4 is rotatably arranged on the inner wall of the casing 10 and is driven to rotate along the rotating shaft 41 by an external knob 11; the shifting fork 5 is connected with the clutch 32, and the shifting fork 5 is matched with the clutch 32 in a conventional plug-in manner; the locking piece 6 is provided with a tooth part 61 which is used for being meshed with the third gear 211, the locking piece 6 is arranged on the shift fork pin 9 and can move along the axial direction of the shift fork pin to lock or unlock the third gear 211, the shift fork pin 9 is also provided with the compression spring 7, two ends of the compression spring 7 respectively abut against between the locking piece 6 and the shift fork 5, and a force which always abuts against the cam piece 43 is given to the surface 62 of the locking piece 6; further, the torsion spring 8 is fixedly installed on the shifting fork 5, the eccentric shaft 42 of the operating part 4 is located between two end parts of the torsion spring 8, the stroke of the locking piece is controlled through the cam piece 43, the stroke of the flexible cutting-in of the shifting fork 5 is controlled through the matching of the eccentric shaft 42 and the torsion spring 8, so that when the operating part 4 is rotated for a certain angle, the eccentric shaft 42 drives the shifting fork 5 through the torsion spring 8 to drive the clutch 32 to move, when the operating part 4 is rotated for a certain angle, the synchronous displacement of the clutch 32 and the locking piece 6 can be realized, the stroke of the displacement of the clutch 32 and the locking piece 6 can be controlled according to the design, so that when the locking piece 6 is driven to be located at a specific position through different states of the operating part 4, the transmission part 2 is limited to be axially reciprocated but not circumferentially rotated, and the clutch 32 is driven to be located at different positions, thereby realizing the switching of different functions.

By setting different gears for the external knob 11, the following effects are achieved: when the operating element 4 rotates to be in a first state, the shifting fork 5 drives the clutch 32 to be in a first position, the clutch gear fitting piece 33 is linked with the intermediate shaft assembly 31, that is, the clutch 32 is sleeved on the clutch gear fitting piece 33 and the positioning sleeve 312 at the same time, at this time, the intermediate shaft 311 rotates and drives the clutch gear fitting piece 33 to rotate, and the rotation output end 21 of the transmission assembly 2 is driven to rotate through the engagement of the second gear 331 and the third gear 211, which is a drilling gear at this time;

when the operating element 4 rotates to be in a second state, the shifting fork 5 drives the clutch 32 to be in a second position, the clutch gear fitting 33, the swing rod bearing fitting 34 and the intermediate shaft assembly 31 realize linkage, namely the clutch 32 is simultaneously sleeved on the clutch gear fitting 33, the positioning sleeve 312 and the swing rod bearing fitting 34, at the moment, the intermediate shaft 311 rotates and simultaneously drives the second gear 331 and the swing rod bearing to synchronously work, so that the rotation output end 21 and the reciprocating output end 22 of the transmission assembly 2 both work simultaneously, and at the moment, the hammer drilling gear is obtained;

in both the above first state and second state, since the rotational output is involved, neither the locking piece 6 nor the third gear 211 on the transmission assembly 2 is in contact;

when the operating piece 4 rotates to be in a third state, the shifting fork 5 drives the clutch 32 to be in a third position, the swing rod bearing fitting piece 34 is linked with the intermediate shaft assembly 31, but the locking piece 6 is still not in contact with the third gear 211 on the transmission assembly 2, the clutch gear fitting piece 33 is in an idle state, the angle of the hammer bit can be adjusted, and the flat chisel angle adjusting gear is obtained;

when the operating element 4 is driven to be in a fourth state, the shifting fork 5 drives the clutch 32 to be in a fourth position, the swing rod bearing fitting piece 34 is linked with the intermediate shaft assembly 31, meanwhile, under the action of the cam piece 43, the locking piece 6 is also pushed to be meshed with the third gear 211 on the transmission assembly 2, the angle of the transmission assembly 2 is locked, circumferential rotation cannot be achieved, axial reciprocation can be achieved, and the operation is a hammer gear.

In the switching process, due to the action of the torsion spring 8 and the compression spring 7, the switching process of the clutch 32 and the locking piece 6 is relatively flexible, the gear shifting work is stable and smooth, and the use function and the operation hand feeling are good. Meanwhile, the locking piece 6 and the shifting fork 5 are linked, bidirectional flexible cutting is realized, and the flat chisel locking function can be completed by one action.

Referring to fig. 9 to 10, further, in order to improve the stability of the engagement of the torsion spring 8 with the fork 5 and to simplify the assembly. Torsional spring 8 sets up to do not need all the other spare parts can accomplish from fixing on shift fork 5, and the mode of realization is as follows: the shifting fork 5 comprises an inserting part 51 used for being matched with the clutch 32, a first fixing part 52 used for installing a torsion spring 8 main body and a second fixing part 53 used for limiting the pins 81 of the torsion spring 8, wherein the second fixing part 53 is provided with a limiting groove 531, two pins 81 of the torsion spring 8 always apply opposite force, so that the two pins tightly abut against the limiting groove 531 of the second fixing part 53, and at the moment, the two pins 81 of the torsion spring 8 are limited to realize that the torsion spring 8 cannot deflect. The winding center of the main body of the torsion spring 8 is defined as a first axis 521, in order to prevent the main body of the torsion spring 8 from falling off, a blocking piece 522 is further disposed on the first fixing portion 52, the main body end of the installed torsion spring 8 is limited by the blocking piece 522, and the pin 81 end of the installed torsion spring 8 is also limited by the second fixing portion 53 and the body of the shift fork 5, so that the main body end or the pin 81 end of the torsion spring 8 cannot be displaced along the first axis 521. Thus, the assembled torsion spring 8 is stably positioned, and the installation position of the torsion spring is accurate. In order to facilitate the mounting of the shift fork 5, the shift fork 5 further comprises two positioning holes 54, and the positioning holes 54 penetrate through the shift fork pin 9.

Furthermore, the casing 10 is designed to be left and right half, a groove for positioning the shifting fork pin 9 is formed in the casing 10, the casing 10 is fixed through two screws, meanwhile, ribs for positioning and guiding the locking piece 6 and the shifting fork 5 are further arranged on the casing 10, and a sliding groove matched with the guiding ribs is formed in the locking piece 6. The rotating shaft 41 of the operating member 4 passes through a hole in the housing 10 to be fixedly engaged with the external knob 11, and is connected by a screw.

The above description is only an embodiment of the present invention, and is not intended to limit the present invention in any way, and simple modifications, equivalent changes and modifications may be made without departing from the technical scope of the present invention.

Claims

1. A function switching structure of a light electric hammer comprises a shifting fork, an operating piece, a locking piece, a gear switching assembly and a transmission assembly; it is characterized in that the preparation method is characterized in that,

the range switching assembly includes: a mid-shaft assembly; a clutch which is circumferentially linked with the intermediate shaft component and can axially displace; the clutch gear fitting piece is sleeved at the first end of the intermediate shaft assembly; the swing rod bearing fitting piece is sleeved at the second end of the intermediate shaft assembly;

the shifting fork is connected to the clutch, the operating part is used for controlling the shifting fork and the locking piece to move, and the locking piece is located at a specific position and limits the transmission assembly to axially reciprocate but not circumferentially rotate;

2. The function switching structure of a light electric hammer according to claim 1, further comprising a fork pin for being simultaneously inserted on the fork and the locking piece; the operating piece comprises a rotating shaft, an eccentric shaft and a cam sheet; the locking piece is arranged on the shifting fork pin and can move along the axial direction of the shifting fork pin to form circumferential locking of the transmission assembly; and a compression spring is further arranged on the shifting fork pin, two ends of the compression spring are respectively abutted between the locking piece and the shifting fork, and the locking piece is provided with a force which is always abutted against the cam piece.

3. The function switching structure of a light electric hammer according to claim 2, wherein a torsion spring is further fixedly installed on the fork, and an eccentric shaft of the operating member is located between two end legs of the torsion spring, so that the stroke of the locking piece is controlled by the cam piece, and the stroke of the flexible cutting of the fork is controlled by the cooperation of the eccentric shaft and the torsion spring.

4. The function switching structure of the light electric hammer according to claim 1, wherein the intermediate shaft assembly comprises an intermediate shaft and a positioning sleeve disposed in the middle of the intermediate shaft, the second end of the intermediate shaft assembly is further provided with a first gear always engaged with a gear of the motor, the clutch gear fitting is provided with a second gear, the second gear is used for driving the middle end of the transmission assembly, the swing rod bearing fitting is provided with a swing rod bearing, and the swing rod bearing is used for driving the transmission assembly to axially reciprocate.

5. The function switching structure of a light electric hammer according to claim 1, wherein when the operating member is in the first state, the shift fork drives the clutch to be in the first position, and the engaging and disengaging gear is coupled with the intermediate shaft assembly, which is a drilling gear.

6. The function switching structure of the light electric hammer according to claim 5, wherein when the operating member is in the second state, the shifting fork drives the clutch to be in the second position, and the clutch gear fitting member, the swing rod bearing fitting member and the intermediate shaft assembly are linked, and in this case, the hammer drill gear is provided.

7. The switching mechanism of light weight electric hammer as claimed in claim 6, wherein when the operating member is in the third state, the shift fork drives the clutch to be in the third position, the mating member of the rocker bearing is linked with the intermediate shaft assembly, and the locking piece is not in contact with the transmission assembly, which is a flat chisel angle adjustment gear.

8. The switching mechanism of light weight electric hammer as claimed in claim 7, wherein when the operating member is in the fourth state, the shift fork drives the clutch to be in the fourth position, the coupling member of the rocker bearing is linked with the middle shaft assembly, and the locking piece locks the transmission assembly, which is a hammer gear.