Hammer converter

Abstract

The present invention discloses a hammer converter. It includes a housing unit, which includes a first through hole and a toothed boss; a transmission shaft unit, which is installed at the first through hole of the housing unit, and the transmission shaft unit has an accommodating cavity inside, and a plurality of movable grooves connected to the accommodating cavity are opened on its outer wall; an impact unit, which includes an impact block built into the accommodating cavity and a plurality of travel rods arranged on the impact block and capable of synchronously moving therewith, the outer ends of the travel rods passing through the movable grooves and assembled at the toothed boss; an elastic member, one end of which abuts against the impact unit and the other end abuts against the inner wall of the accommodating cavity; and a drill bit. The present invention adopts a brand-new design, with the motor driving the transmission shaft to rotate as the initial action, combined with the travel rod and the toothed boss to cooperate to compress the elastic member, and finally the elastic member pushes the impact block to impact the drill bit. The overall structure is simple, stable and reliable, with low requirements for injecting lubricating oil, and convenient for subsequent maintenance.

Description

Technical Field

[0001] The present invention relates to the technical field of electric tools, in particular to a hammer converter. Background Art

[0002] The existing common dual-purpose electric hammer and electric drill power tools mainly switch between the electric hammer and electric drill by replacing the drill chuck. In actual use, the drill chuck will be frequently installed and removed, which is very inconvenient to operate. In addition, the drilling accuracy of this dual-purpose power tool is low, the user feels uncomfortable, and the processing efficiency is low. Therefore, the applicant has made improvements. Summary of the Invention

[0003] The present invention aims at the deficiencies in the prior art and provides a hammer converter.

[0004] In order to solve the above technical problems, the present invention is solved by the following technical solutions:

[0005] Hammer converter, including

[0006] A housing unit comprising a first through hole and a tooth-shaped boss;

[0007] A transmission shaft unit is mounted at the first through hole of the housing unit and can be driven by the driving unit to rotate. The transmission shaft unit has an internal accommodating cavity and a plurality of movable grooves connected to the accommodating cavity are formed on its outer wall;

[0008] An impact unit, comprising an impact block built into the accommodating cavity and a plurality of travel rods provided on the impact block and capable of synchronously moving therewith, wherein the outer ends of the travel rods pass through the movable grooves and are assembled on the toothed bosses;

[0009] an elastic member, one end of which abuts against the impact unit and the other end of which abuts against the inner wall of the accommodating cavity; and

[0010] A drill head is movable within the stroke range of the impact unit.

[0011] In the above scheme, preferably, the transmission shaft unit includes a main transmission shaft and a secondary transmission shaft that are assembled and connected to each other and can move synchronously, and the main transmission shaft and the secondary transmission shaft are correspondingly provided with a accommodating cavity and a movable groove, the impact block and the elastic member are installed in the secondary transmission shaft, and the travel rod passes through the movable groove on the secondary transmission shaft and the movable groove on the main transmission shaft and is assembled on the toothed boss.

[0012] In the above solution, preferably, the housing unit includes an outer housing and an inner housing, both the outer housing and the inner housing are provided with a first through hole for the transmission shaft unit to pass through, and the toothed boss is provided on the inner housing.

[0013] In the above solution, preferably, at least a portion of the drill bit is installed in the accommodating cavity of the main transmission shaft.

[0014] In the above solution, preferably, an impact transition piece is provided between the drill bit and the impact block;

[0015] The impact transition piece is spherical in shape.

[0016] In the above scheme, preferably, the accommodating cavity of the main transmission shaft includes a first accommodating cavity for accommodating at least part of the auxiliary transmission shaft and a second accommodating cavity for accommodating at least part of the drill bit, the first accommodating cavity and the second accommodating cavity are connected to each other, and a first step is formed at the first accommodating cavity.

[0017] In the above solution, preferably, an annular gasket is provided between the inner end of the auxiliary transmission shaft and the first step, and the aperture of the second through hole on the annular gasket is smaller than the outer diameter of the impact transition piece.

[0018] In the above solution, preferably, a sliding member is provided on the travel rod, and the sliding member is installed at the movable groove;

[0019] The sliding member is a bearing;

[0020] The outer diameter of the sliding member is consistent with the width of the movable groove.

[0021] In the above solution, preferably, the impact block includes a second step, and one end of the elastic member abuts against the second step;

[0022] The elastic member is a spring;

[0023] The tooth-shaped boss includes a plurality of boss units, each of which includes a first wall extending from low to high and a vertical or nearly vertical second wall, one end of the second wall being transitionally connected to the highest end of the first wall, and the other end being transitionally connected to the lowest end of another adjacent boss unit;

[0024] The lowest end of the tooth-shaped boss comprises a recess that matches the shape and size of the travel rod.

[0025] In the above solution, preferably, bearings are provided between the outer shell and the main transmission shaft, and between the outer shell and the auxiliary transmission shaft.

[0026] The outer end of the main transmission shaft is equipped with a limit piece, and the limit piece is provided with a hole for the drill bit to pass through, and the diameter of the hole matches the outer diameter of the corresponding part of the drill bit;

[0027] An annular groove is formed on the outer end of the main transmission shaft, and the limiting member includes a limiting portion that matches the annular groove so that the two are engaged with each other;

[0028] A plurality of limiting strips are provided on the inner wall of the accommodating cavity of the main transmission shaft, and a plurality of limiting grooves corresponding to the limiting strips are provided on the drill bit;

[0029] The main transmission shaft is provided with a plurality of third through holes connected to the accommodating cavity, the third through holes are equipped with steel balls, the drill bit is provided with a groove body that cooperates with the steel balls, the main transmission shaft is slidably equipped with a locking member for cooperating with the steel balls, and a spring is provided between the locking member and the corresponding bearing;

[0030] The locking member is equipped with a kit;

[0031] A plurality of grooves are formed on one end of the main transmission shaft, and a plurality of protrusions corresponding to the grooves are provided on the auxiliary transmission shaft. The main transmission shaft can rotate synchronously with the rotation of the auxiliary transmission shaft through the cooperation between the grooves and the protrusions.

[0032] The driving unit is a motor.

[0033] The beneficial effects of the present invention are:

[0034] The present invention adopts a brand-new design, with the motor driving the transmission shaft to rotate as the initial action, combined with the travel rod and the toothed boss to compress the elastic part, and finally the elastic part pushes the impact block to impact the drill bit. The overall structure is simple, stable and reliable, with low requirements for the injection of lubricating oil, which is convenient for subsequent maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 Schematic diagram of the present invention.

[0036] Figure 2 It is a schematic diagram of the decomposition of the present invention.

[0037] Figure 3 Schematic diagram of the cooperation between the travel rod and the toothed boss of the present invention.

[0038] Figure 4 It is a cross-sectional schematic diagram of the present invention.

[0039] Figure 5 Schematic diagram of the main transmission shaft of the present invention.

[0040] Figure 6 Schematic diagram of the drill bit of the present invention.

[0041] Figure 7 It is a schematic diagram of the cooperation between the transmission shaft unit, the travel rod and the housing unit of the present invention.

[0042] Figure 8 Schematic diagram of the cooperation between the impact unit and the drill bit of the present invention. DETAILED DESCRIPTION

[0043] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0044] See also Figures 1-8 The hammer converter includes a housing unit, a transmission shaft unit, an impact unit, an elastic member 4 and a drill bit 5.

[0045] The housing unit includes a first through hole 11 and a tooth-shaped boss 12. In this embodiment, in order to make the relevant components all hidden, the housing unit includes an outer housing 13 and an inner housing 14. Figure 1-Figure 3 As shown, the outer shell 13 and the inner shell 14 are both provided with a first through hole for the transmission shaft unit to pass through. The inner shell 14 is located inside the outer shell 13 and can be covered by it. One end of the transmission shaft unit extends and is exposed outside the outer shell 13. This part is used for transmission connection with the drive unit. The drive unit can be a motor, or this part can be installed on the drill chuck at the front of the electric drill and used as an electric hammer after replacing the electric drill bit.

[0046] The toothed boss 12 may be provided on the inner shell 14, as shown in FIG. Figure 3 As shown, the toothed boss 12 is used to cooperate with the stroke rod 31 in the impact unit. The toothed boss 12 includes a plurality of boss units. Each boss unit includes a first wall 121 from low to high and a vertical or nearly vertical second wall 122. The second wall 122 provides the possibility for the stroke rod to fall instantly. Specifically, one end of the second wall 122 is transitionally connected to the highest end of the first wall 121, and the other end is transitionally connected to the lowest end of another adjacent boss unit.

[0047] In order to ensure that the travel rod 31 and the toothed boss 12 cooperate more stably when the device is not in use, a recess 123 that matches the shape and size of the travel rod 31 may be designed at the lowest end of the toothed boss 12 .

[0048] The transmission shaft unit is installed at the first through hole of the housing unit and can be driven by the driving unit to rotate. The transmission shaft unit has an accommodating cavity 21 inside and a plurality of movable grooves 22 connected to the accommodating cavity are opened on its outer wall.

[0049] In this embodiment, the transmission shaft unit includes a main transmission shaft 23 and a secondary transmission shaft 24. Figure 2 、 Figure 4 and Figure 7 The main transmission shaft 23 and the auxiliary transmission shaft 24 can be assembled and connected to each other and can move synchronously. The main purpose of designing the transmission shaft unit as two detachable main transmission shafts 23 and auxiliary transmission shafts 24 is to facilitate the installation and removal of the internal components.

[0050] The main transmission shaft 23 and the auxiliary transmission shaft 24 can be assembled and connected by the cooperation between the protrusion 241 and the groove 231. Figure 2 In the exploded view, a plurality of grooves 231 are provided at one end of the main transmission shaft 23, and a plurality of protrusions 241 corresponding to the grooves 231 are provided on the auxiliary transmission shaft 24. The specific number of grooves 231 and protrusions 241 can be selected according to actual needs. For example, four protrusions 241 can be provided, and each protrusion 241 is inserted into the corresponding groove 231 to realize the assembly between the main transmission shaft 23 and the auxiliary transmission shaft 24. After assembly, the two form a whole and can move synchronously.

[0051] In this embodiment, the main transmission shaft 23 and the auxiliary transmission shaft 24 are respectively provided with a receiving cavity 21 and a movable groove 22. Figure 4 In the cross-sectional view, the accommodating cavity 21 of the main transmission shaft 23 and the accommodating cavity 21 of the auxiliary transmission shaft 24 can be connected to each other, and the movable groove 22 of the main transmission shaft 23 and the movable groove 22 of the auxiliary transmission shaft 24 correspond one to one for the corresponding stroke rod 31 to pass through.

[0052] The accommodating cavity 21 of the main transmission shaft 23 may include a first accommodating cavity 211 for accommodating at least part of the auxiliary transmission shaft 24 and a second accommodating cavity 212 for accommodating at least part of the drill bit. The first accommodating cavity 211 and the second accommodating cavity 212 are connected to each other, and a first step 213 is formed at the first accommodating cavity 211. For details about the function of the first step 213, please refer to the description of the impact unit below.

[0053] The main transmission shaft 23 also has a matching structure with the drill bit 5, as follows:

[0054] As described above, the main transmission shaft 23 is driven by the secondary transmission shaft 24 to rotate, and the drill bit 5 can also be driven by the main transmission shaft 23 to rotate, making its movement more stable. Specifically, a plurality of limit strips 232 (which can be set on the inner wall of the second accommodating cavity) are provided on the inner wall of the accommodating cavity of the main transmission shaft 23. Figure 5 As shown, the drill bit 5 is provided with a plurality of limiting grooves 51 corresponding to the limiting strips 232 , and the limiting strips 232 are matched with the limiting grooves 51 to mount the drill bit 5 on the main transmission shaft 23 .

[0055] In order to make the output of the drill bit 5 more stable, a limit member 25 is also assembled at the outer end of the main transmission shaft 23. The limit member 25 is provided with a hole for the drill bit 5 to pass through, and the aperture of the hole matches the outer diameter of the corresponding part of the drill bit 5. The corresponding part refers to the part within the active stroke range of the drill bit 5 that passes through or is close to the limit member 25.

[0056] Regarding the cooperation between the limiting member 25 and the main transmission shaft 23, one implementation method is as follows:

[0057] An annular groove 26 is formed at the outer end of the main transmission shaft 23, and the limiting member 25 includes a limiting portion 251 that matches the annular groove 26 so that the two are engaged with each other. The limiting portion 251 is inserted into the annular groove 26 on the main transmission shaft 23 to achieve an assembly connection between the two.

[0058] Furthermore, it is necessary to make the drill bit 5 move only within the set travel range on the main transmission shaft 23 to prevent it from falling off, and the following design is made:

[0059] The main transmission shaft 23 is provided with a plurality of third through holes 27 communicating with the second accommodating cavity 212. Figure 4 、 Figure 5 As shown, a steel ball 28 is installed at the third through hole 27. Correspondingly, a groove 52 is provided on the drill bit 5 to match the steel ball 28. During the reciprocating motion of the drill bit 5, the steel ball 28 changes its relative position within the groove 52.

[0060] When there is no external force acting on the steel ball 28, the drill bit 5 can be removed from the main transmission shaft 23. When work requires, the drill bit 5 cannot be removed from the main transmission shaft 23. This can be achieved by pressing down the steel ball 28. Specifically, a locking member 61 for cooperating with the steel ball 28 is slidably assembled on the main transmission shaft 23. When the locking member 61 presses the steel ball 28, the drill bit 5 cannot be removed, and when the locking member 61 leaves the position of the steel ball 28, the drill bit 5 can be removed.

[0061] Furthermore, a spring 63 is provided between the locking member 61 and the corresponding bearing 62, and a kit 64 is assembled on the locking member 61. When the drill bit 5 needs to be removed, the kit 64 is pushed laterally and the spring 63 contracts. After removal or when the drill bit 5 needs to be locked after installation, the kit 64 is released and the spring 63 recovers to achieve locking of the drill bit 5.

[0062] At the same time, the gap between the inner wall of the sleeve 64 and the main transmission shaft 23 can be designed to be smaller than the radius or diameter of the steel ball, so that when the sleeve 64 drives the locking member 61 to move, the steel ball 28 will not escape from the corresponding hole.

[0063] The impact unit includes an impact block 32 built into the accommodating cavity 21 and a plurality of travel rods 31 arranged on the impact block 32 and capable of synchronously moving therewith. The outer ends of the travel rods 31 pass through the movable slots 22 and are assembled on the toothed bosses 12 .

[0064] As described above, the secondary transmission shaft 24 also has a receiving cavity 21 and a movable groove 22. In this embodiment, the impact block 32 is disposed in the receiving cavity 21 of the secondary transmission shaft 24. Figure 4 and Figure 8 As shown, the impact block 32 has a portion with a larger diameter, where a second step 321 is formed. An elastic member 4 is provided, which can be sleeved on the impact block 32. One end of the elastic member 5 rests on the second step 321, and the other end rests on the inner wall of the accommodating cavity 21 of the auxiliary transmission shaft 24. The elastic member 4 can be a spring.

[0065] The travel rod 31 can be passed through the impact block 32 or integrally formed on the impact block 32 , and one or both ends of the travel rod 31 pass through the movable slots 22 of the main transmission shaft 23 and the auxiliary transmission shaft 24 , and then engage with the corresponding portion of the toothed boss 12 .

[0066] When the motor drives the auxiliary transmission shaft 24 and the main transmission shaft 23 to rotate, the travel rod 31 is affected by the wall of the movable groove 22 and rotates accordingly. At the same time, the travel rod 31 is affected by the wall of the toothed boss 12 and gradually moves away from the drill bit 5, driving the impact block 32 to move in the same direction, thereby compressing the elastic member 4. When the travel rod 31 leaves the highest point of the toothed boss 12, it quickly falls to the lowest point of the toothed boss 12, and the elastic member 4 stretches, pushing the impact block 32 to impact the drill bit 5, completing the hammering function.

[0067] In this embodiment, the impact unit further includes an impact transition piece 7, which is disposed between the drill bit 5 and the impact block 32 and is located in the accommodating cavity of the main transmission shaft 23 (specifically, the second accommodating cavity 212). Figure 4 As shown, the shape of the impact transition piece 7 can be spherical, and in order to further limit the movable range of the impact transition piece 7, an annular gasket 71 is provided between the inner end of the auxiliary transmission shaft 24 and the first step 213 of the main transmission shaft 23, and the aperture of the second through hole of the annular gasket 71 is smaller than the outer diameter of the impact transition piece 7.

[0068] For other supplementary settings, a sliding member 72 is provided on the travel rod 31, such as Figure 7 As shown, the sliding member 72 is installed at the movable groove 22 to reduce the friction loss therebetween. The sliding member 72 can be a small bearing, and the outer diameter of the sliding member 72 can be consistent with the width of the movable groove 22.

[0069] like Figure 4 、 Figure 8 As shown, bearings may be provided between the outer shell 13 and the main transmission shaft 23 and between the outer shell 13 and the auxiliary transmission shaft 24 , wherein the bearings between the outer shell 13 and the main transmission shaft 23 may be used for abutment of the spring as described above.

[0070] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. Hammer converter, characterized by: include A housing unit comprising a first through hole and a tooth-shaped boss; A transmission shaft unit is mounted at the first through hole of the housing unit and can be driven by the driving unit to rotate. The transmission shaft unit has an internal accommodating cavity and a plurality of movable grooves connected to the accommodating cavity are formed on its outer wall; An impact unit, comprising an impact block built into the accommodating cavity and a plurality of travel rods provided on the impact block and capable of synchronously moving therewith, wherein the outer ends of the travel rods pass through the movable grooves and are assembled on the toothed bosses; an elastic member, one end of which abuts against the impact unit and the other end of which abuts against the inner wall of the accommodating cavity; and A drill head is movable within the stroke range of the impact unit.

2. The hammer converter according to claim 1, characterized in that: The transmission shaft unit includes a main transmission shaft and a secondary transmission shaft that are assembled and connected to each other and can move synchronously. The main transmission shaft and the secondary transmission shaft are correspondingly provided with a accommodating cavity and a movable groove. The impact block and the elastic member are installed in the secondary transmission shaft. The travel rod passes through the movable groove on the secondary transmission shaft and the movable groove on the main transmission shaft and is assembled on the toothed boss.

3. The hammer converter according to claim 2, characterized in that: The housing unit includes an outer housing and an inner housing. The outer housing and the inner housing are both provided with a first through hole for the transmission shaft unit to pass through. The toothed boss is provided on the inner housing.

4. The hammer converter according to claim 2, characterized in that: At least a portion of the drill bit is installed in the accommodating cavity of the main transmission shaft.

5. The hammer converter according to claim 2, characterized in that: An impact transition piece is provided between the drill bit and the impact block; The impact transition piece is spherical in shape.

6. The hammer converter according to claim 5, characterized in that: The accommodating cavity of the main transmission shaft includes a first accommodating cavity for accommodating at least part of the auxiliary transmission shaft and a second accommodating cavity for accommodating at least part of the drill bit. The first accommodating cavity and the second accommodating cavity are connected to each other, and a first step is formed at the first accommodating cavity.

7. The hammer converter according to claim 6, characterized in that: An annular washer is provided between the inner end of the auxiliary transmission shaft and the first step, and the aperture of the second through hole on the annular washer is smaller than the outer diameter of the impact transition piece.

8. The hammer converter according to claim 1, characterized in that: The travel rod is provided with a sliding member, and the sliding member is installed at the movable groove; The sliding member is a bearing; The outer diameter of the sliding member is consistent with the width of the movable groove.

9. The hammer converter according to claim 1, characterized in that: The impact block includes a second step, and one end of the elastic member abuts against the second step; The elastic member is a spring; The tooth-shaped boss includes a plurality of boss units, each of which includes a first wall extending from low to high and a vertical or nearly vertical second wall, one end of the second wall being transitionally connected to the highest end of the first wall, and the other end being transitionally connected to the lowest end of another adjacent boss unit; The lowest end of the tooth-shaped boss comprises a recess that matches the shape and size of the travel rod.

10. The hammer converter according to claim 3, characterized in that: Bearings are correspondingly provided between the outer shell and the main transmission shaft, and between the outer shell and the auxiliary transmission shaft; The outer end of the main transmission shaft is equipped with a limit piece, and the limit piece is provided with a hole for the drill bit to pass through, and the diameter of the hole matches the outer diameter of the corresponding part of the drill bit; An annular groove is formed on the outer end of the main transmission shaft, and the limiting member includes a limiting portion that matches the annular groove so that the two are engaged with each other; A plurality of limiting strips are provided on the inner wall of the accommodating cavity of the main transmission shaft, and a plurality of limiting grooves corresponding to the limiting strips are provided on the drill bit; The main transmission shaft is provided with a plurality of third through holes connected to the accommodating cavity, the third through holes are equipped with steel balls, the drill bit is provided with a groove body that cooperates with the steel balls, the main transmission shaft is slidably equipped with a locking member for cooperating with the steel balls, and a spring is provided between the locking member and the corresponding bearing; The locking member is equipped with a kit; A plurality of grooves are formed on one end of the main transmission shaft, and a plurality of protrusions corresponding to the grooves are provided on the auxiliary transmission shaft. The main transmission shaft can rotate synchronously with the rotation of the auxiliary transmission shaft through the cooperation between the grooves and the protrusions. The driving unit is a motor.

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