CN100455414C - Rotary Hammer with Magnetic Impact Mechanism - Google Patents

Abstract

The invention discloses an electric hammer with a magnetic impact mechanism. Including housing, motion transmission mechanism, magnetic impact mechanism and drill chuck. In the magnetic impact mechanism, the fixed sleeve is fixed in the housing, and an impact hammer is installed at one end of the drive shaft in the small end of the fixed sleeve, the axial guide pin of the drive shaft is inserted into the guide groove of the drive shaft, and the fixed sleeve A drive disc and a rotating disc are installed in the stepped shaft hole at the big end of the barrel. The other end of the drive shaft is connected to the drive disc. There is an annular groove on the drive disc, and a ring-shaped permanent magnet is installed in the groove. One end of the rotating disc is connected to the rotating shaft. There is an annular groove on the disk, and a ring-shaped permanent magnet is installed in the groove. The mutual rotation between the two ring-shaped permanent magnets generates repulsive force and attractive force, which makes the driving disk move back and forth relative to the rotating shaft, and drives the impact hammer to perform impact movement. The other end of the gear is connected with the large gear of the motion transmission mechanism. Because the two annular permanent magnets are not in contact with each other, the invention can greatly reduce vibration and noise.

Description

Rotary Hammer with Magnetic Impact Mechanism

technical field

The invention relates to a hand-held electric tool, in particular to an electric hammer with a magnetic impact mechanism.

Background technique

For manual machine tools with impact drivers, such as electric hammers, the traditional working method of this type of electric hammer is as follows. The rotary motion of the motor reaches the rotating sleeve through the gear transmission mechanism fixed on the shaft, and the rotation of the rotating sleeve One end is equipped with a drill chuck, which drives the drill bit to rotate. In addition, the rotary motion of the motor reaches the crank mechanism through the gear transmission mechanism fixed on the shaft, which converts the rotary motion of the motor into the reciprocating motion of the connecting rod, and pushes the piston to compress the air to generate impact. force, and then make the impact hammer and punch reciprocate, hit the drill bit, and finally realize the hammer drilling function of the electric hammer. This structure, which utilizes the reciprocating motion of the piston to generate the impact force, has high requirements on the sealing performance of the piston chamber, high manufacturing cost, heat generation and energy loss due to friction, and very large vibration and noise.

In recent years, due to the improvement of the new generation of permanent magnet materials in high remanence, high coercive force, high energy product and other performance improvements and cost reductions, more and more mechanical parts and products using permanent magnets, magnetic transmission has many advantages , no friction and wear problems, can move at high speed, less vibration and noise, its potential magnetic properties are extremely high, and it can pick up heavy objects equivalent to 640 times its own weight. Therefore, permanent magnets are widely used.

Contents of the invention

The object of the present invention is to provide an electric hammer with a magnetic impact mechanism. The impact mechanism uses the relative rotation of two pairs of two-stage permanent magnets to form attractive and repulsive forces to strike the impact hammer and drive the tool to reciprocate and impact.

The technical scheme that the present invention solves technical problem adopts is:

It includes a housing, a motion transmission mechanism consisting of a motor, a bull gear, an intermediate gear, a pinion and a drive gear, an impact mechanism and a drill chuck. The impact mechanism is a magnetic impact mechanism, and its fixed sleeve is a stepped shaft, which is fixed in the housing. The stepped shaft is equipped with a drive shaft, and one end of the drive shaft located in the small end of the fixed sleeve is coaxially equipped with an impact hammer. , the drive shaft has a guide groove in the axial direction, and the fixed sleeve has a hole in the radial direction of the small end stepped shaft. The guide pin is installed in the radial hole of the fixed sleeve small end stepped shaft and inserted into the guide groove of the drive shaft. A drive disc and a rotating disc are installed in the stepped shaft hole at the big end of the fixed sleeve. The other end of the drive shaft is connected to the drive disc. There is an annular groove on the drive disc, and the first annular permanent magnet is installed in the groove. The shaft is connected, and there is an annular groove on the rotating disc opposite to the first annular permanent magnet of the driving disc. The second annular permanent magnet is installed in the annular groove on the rotating disc, and the mutual rotation between the two annular permanent magnets generates a repulsive force. And the attractive force makes the driving disc move back and forth relative to the rotating shaft, the driving shaft drives the impact hammer to move axially, and the other end of the rotating shaft is connected with the large gear of the motion transmission mechanism.

The two ring-shaped permanent magnets are two-pole permanent magnets, which are respectively composed of two semi-circular rings.

The two ring-shaped permanent magnets are multi-pole permanent magnets, which are respectively composed of S and N poles intersecting rings.

The beneficial effect that the present invention has compared with background technology is:

Compared with the traditional piston impact mechanism, because the impact force is generated in a non-sealed state, the magnetic impact mechanism has no special sealing requirements and has a simple structure; because the two ring-shaped permanent magnets are not in contact with each other, therefore, Can greatly reduce vibration and noise.

Description of drawings

Fig. 1 is a schematic diagram of the principle of the impact structure of the present invention.

Figure 2 is an A-A view of the present invention.

Fig. 3 is a schematic diagram of the principle of the impact drill equipped with the impact structure of the present invention.

Among the figure: 1, fixed sleeve, 2, impact hammer, 3, drive shaft, 4, guide pin, 5, drive disc, 6, magnet, 7, magnet, 8 rotating disc, 9, rotating shaft, 10, large gear , 11, support, 12, motor, 13, intermediate gear, 14, intermediate shaft, 15, pinion, 16, drive gear, 17, support sleeve, 18, housing 19, rotating sleeve, 20, drill chuck , 21, screw.

Detailed ways

As shown in Fig. 1, Fig. 2 and Fig. 3, the present invention includes a housing 18, a motion transmission mechanism composed of a motor 12, a bull gear 10, an intermediate gear 13, a pinion 15 and a driving gear 16, an impact mechanism and a drill chuck 20. The impact mechanism is a magnetic impact mechanism, and its fixed sleeve 1 is a stepped shaft, which is fixed in the housing 18 and cannot move or rotate axially. The drive shaft 3 is installed in the stepped shaft, which is located at the small end of the fixed sleeve 1 One end of the drive shaft 3 inside is coaxially equipped with an impact hammer 2, the drive shaft 3 has a guide groove in the axial direction, the fixed sleeve 1 has a hole in the radial direction of the small end of the stepped shaft, and the guide pin 4 is installed in the hole and inserted into the drive shaft. In the guide groove of 3, a drive disc 5 and a rotating disc 8 are installed in the stepped shaft hole at the large end of the fixed sleeve 1, and the other end of the drive shaft 3 is connected with the drive disc 5. There is an annular groove on the drive disc 5, and the groove is equipped with The first annular permanent magnet 6 is arranged, and the annular permanent magnet 6 is fixed on the driving disk 5 with a screw 21, and one end of the rotating disk 8 is connected with the rotating shaft 9, and the rotating disk 8 opposite to the first annular permanent magnet 6 of the driving disk 5 is opened. There is an annular groove, the second annular permanent magnet 7 is housed in the groove, and the annular permanent magnet 7 is fixed on the rotating disk 8 with screws 21, and the mutual rotation between the two annular permanent magnets 6, 7 produces repulsive force and attractive force, so that the driving disk 5 moves back and forth relative to the rotating shaft 9, the drive shaft 3 compresses the air to make the impact hammer 2 move axially, and the other end of the rotating shaft 9 is connected with the large gear 10 of the motion transmission mechanism.

As shown in FIG. 2 , the two ring-shaped permanent magnets 6 and 7 are two-pole permanent magnets, which are respectively composed of two semi-circular rings.

The two ring-shaped permanent magnets 6 and 7 are multi-pole permanent magnets, which are composed of S and N poles intersecting rings respectively.

The working principle of the present invention is as follows:

As shown in Figure 3, a motor 12 is installed in the support 11 of the electric hammer. When the motor 12 rotates, the intermediate gear 13 on the intermediate shaft 14 is driven by the front gear of the armature shaft, and the intermediate gear 13 and the pinion 15 are fixed on the On the intermediate shaft 14, it rotates together with the intermediate shaft 14. Therefore, the rotary motion can be transmitted to the driving gear 16 through the pinion 15. The driving gear 16 is fixed on the rotating sleeve 19, and the rotating sleeve 19 is supported on the supporting sleeve 17 through bearings. It cannot move axially, but can rotate relative to the fixed sleeve 1, and its front end is equipped with a drill chuck 20. When the driving gear 16 drives the rotating sleeve 19 to rotate, it can drive the drill chuck 20 to rotate, thereby driving the drill chuck inserted in it. The drill bit (not shown) rotates.

Simultaneously, when intermediate gear 13 rotates, drive bull gear 10 to rotate, bull gear 10 is fixed on the rotating shaft 9, and the other end of rotating shaft 9 is fixed rotating disk 8, as shown in Figure 1, magnet 7 is housed in rotating disk 8 , as shown in FIG. 2, when the rotating shaft 9 rotates, it drives the rotating disk 8 to rotate, so that the magnet 7 installed in the rotating disk 8 rotates. Because magnet 7 is a two-pole permanent magnet, magnet 6 is housed in the drive disc 5 relative to rotating disc 8, and magnet 6 is a two-pole permanent magnet, and drive disc 5 is fixed on the drive shaft 3, therefore, when two magnets 6,7 polarities At the same time, a repulsive force will be produced. When the polarities of the two magnets 6 and 7 are opposite, an attractive force will be produced. Since the guide pin 7 is housed in the guide groove of the drive shaft 3, the two magnets 6 and 7 will not be damaged by excessive magnetic force. And combined together, so as to push the drive shaft 3 forward, hit the impact hammer 2, and then realize the reciprocating motion of the drill bit (not shown), and finally realize the hammer drilling function of the electric hammer. The guide groove of the drive shaft 3 can avoid the adhesion of the magnet 6 and the magnet 7 when they attract each other and the impact of the drive disc 5 on the end face of the fixed sleeve 1 when they repel.

The above specific embodiments are used to explain the invention, rather than to limit the present invention. Within the spirit of the present invention and the protection scope of the claims, any modification and change made to the present invention will fall into the protection scope of the present invention.

Claims (3)

1. An electric hammer with a magnetic impact mechanism, comprising a housing (18), consisting of a motor (12), a large gear (10), an intermediate gear (13), a pinion (15) and a drive gear (16) The motion transmission mechanism, the impact mechanism and the drill chuck (20), are characterized in that: the impact mechanism is a magnetic impact mechanism, and its fixed sleeve (1) is a stepped shaft, which is fixed in the housing (18), and the stepped shaft A driving shaft (3) is installed inside, and one end of the driving shaft (3) located in the stepped shaft at the small end of the fixed sleeve (1) is coaxially equipped with an impact hammer (2), and the driving shaft (3) has a guide groove in the axial direction. There is a hole in the radial direction of the small end stepped shaft of the fixed sleeve (1), and the guide pin (4) is installed in the radial hole of the small end stepped shaft of the fixed sleeve (1) and inserted into the guide groove of the drive shaft (3) , the drive disc (5) and the rotating disc (8) are installed in the stepped shaft hole at the big end of the fixed sleeve (1), the other end of the drive shaft (3) is connected with the drive disc (5), and the drive disc (5) is opened There is an annular groove, the first annular permanent magnet (6) is housed in the groove, one end of the rotating disc (8) is connected with the rotating shaft (9), and the rotating disc opposite to the first annular permanent magnet (6) of the drive disc (5) (8) has an annular groove, and the second annular permanent magnet (7) is housed in the annular groove on the said rotating disk (8), and the mutual rotation between the two annular permanent magnets (6, 7) generates repulsive force and Attractive force makes the driving disc (5) move back and forth relative to the rotating shaft (9), the driving shaft (3) drives the impact hammer (2) to move axially, and the other end of the rotating shaft (9) and the motion transmission mechanism Bull gear (10) is connected. 2. An electric hammer with a magnetic impact mechanism according to claim 1, characterized in that: the two ring-shaped permanent magnets (6, 7) are two-pole permanent magnets, which are respectively composed of two semicircular rings. 3. An electric hammer with a magnetic impact mechanism according to claim 1, characterized in that: the two ring-shaped permanent magnets (6, 7) are multi-pole permanent magnets, respectively S and N poles intersecting rings composition.

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