CN106625446B

CN106625446B - Reciprocating saw head

Info

Publication number: CN106625446B
Application number: CN201611048870.1A
Authority: CN
Inventors: 李孝忠; 张进; 游瑞华; 亓书岳
Original assignee: Zhejiang YAT Electrical Appliance Co Ltd
Current assignee: Zhejiang YAT Electrical Appliance Co Ltd
Priority date: 2016-11-23
Filing date: 2016-11-23
Publication date: 2023-07-21
Anticipated expiration: 2036-11-23
Also published as: CN106625446A

Abstract

The invention discloses a reciprocating saw machine head, which belongs to the field of garden machinery and comprises a machine head shell, a reciprocating rod arranged in the machine head shell and used for connecting a cutting saw blade, and a swing rod bearing assembly in transmission connection between the reciprocating rod and a driving source, wherein the swing rod bearing assembly comprises a bearing inner core, a bearing outer ring and a swing rod sleeve piece sleeved on the bearing inner core, the swing rod sleeve piece comprises an annular part and a swing rod column, the swing rod column is movably connected with the reciprocating rod, and a stabilizing piece used for reducing vibration in the swing process of the swing rod sleeve piece is connected to the annular part. The invention has the advantages of effectively reducing vibration and increasing stability.

Description

Reciprocating saw head

[ field of technology ]

The invention relates to a reciprocating saw head, and belongs to the field of garden machinery.

[ background Art ]

The reciprocating saw is one of the comparatively common electric tools in garden machinery, and its main theory of operation is motor drive cutting saw bit reciprocating motion to realize the purpose of cutting, current reciprocating saw drives cutting saw bit reciprocating motion through eccentric wheel transmission mode usually, but eccentric wheel structure often is bulky, occupies a large amount of spaces, causes electric tool whole volume great, and vibration is partial big moreover.

Therefore, the oscillating bar bearing is used for replacing eccentric wheel transmission in the prior market, and the reciprocating saw with the oscillating bar bearing solves the problem of larger volume, but the vibration of the electric tool is still larger, and the stability is not good enough.

[ invention ]

The invention aims to solve the technical problem of overcoming the defects of the prior art and providing the reciprocating saw head which effectively reduces vibration and increases stability.

The technical problems are solved, and the invention adopts the following technical scheme:

the utility model provides a reciprocating saw aircraft nose, includes the aircraft nose shell, establishes the reciprocating rod that is used for connecting the cutting saw bit in the aircraft nose shell, transmission connection be in pendulum rod bearing assembly between reciprocating rod and the actuating source, pendulum rod bearing assembly includes bearing inner core, bearing outer lane and the pendulum rod external member of cover on the bearing inner core, the pendulum rod external member includes annular part and pendulum rod post, the pendulum rod post with reciprocating rod swing joint, be connected with the stabilizer that is used for reducing the vibration of pendulum rod external member swing in-process on the annular part.

The beneficial effects of the invention are that:

in the original reciprocating saw head, the main stress part of the whole swing rod bearing assembly is concentrated at the end part of the swing rod, and the stress at the annular part far away from the end part of the swing rod is smaller, so that the swing rod assembly is unevenly stressed in the swinging process, and the vibration is larger in the swinging process and the stability is poor.

Preferably, the stabilizer includes a return spring provided between the annular end surface and the handpiece housing.

Preferably, the stabilizer further includes a weight provided on the annular portion, and the weight is integrally formed with or fixed to the annular portion.

Preferably, the return spring includes a front spring and a rear spring, the front spring and the rear spring being provided on different sides of the annular portion, respectively.

Preferably, the annular portion is provided with a first spring groove for mounting the return spring, and a spherical protrusion for positioning an inner ring of the return spring is arranged in the first spring groove.

Preferably, the machine head shell is internally provided with an inner box body, the swing rod bearing assembly is arranged in the inner box body, the front end of the bearing inner core is rotationally connected with the front wall surface of the inner box body through a rotating shaft, the rear wall of the inner box body is provided with a connecting cover, and the connecting cover is provided with a bearing groove for positioning the bearing outer ring.

Preferably, the inner box body is provided with a rotating shaft hole for positioning the rotating shaft, an arc inner wall surface is arranged in the inner box body, the connecting cover extends towards the inner box body to form the bearing groove, the connecting cover inner wall is installed on the arc inner wall surface in a matching mode, and the axes of the connecting cover inner wall, the rotating shaft hole and the arc inner wall surface are in the same straight line.

Preferably, the return spring comprises a front spring and a rear spring, the front spring and the rear spring are respectively arranged on different sides of the annular part, a second spring groove or a spring positioning column for installing the front spring is arranged on the front side wall of the inner box body, and a third spring groove or a spring positioning column for installing the rear spring is arranged on the connecting cover.

Preferably, the top of the inner box body is provided with an inner box cover, the reciprocating rod is arranged between the inner box cover and the inner box body, and a reciprocating rod base plate is arranged between the reciprocating rod and the inner box body.

Preferably, a roller is inserted on the swing rod column, the roller is in clearance fit with the swing rod column, and the roller is hinged on the reciprocating rod through a pin shaft.

These features and advantages of the present invention will be disclosed in detail in the following detailed description and the accompanying drawings.

[ description of the drawings ]

The invention is further described with reference to the accompanying drawings:

FIG. 1 is a schematic view of the structure of the same power tool with different work heads installed;

FIG. 2 is a schematic illustration of the connection of a power tool to a drill chuck, a reciprocating saw head;

FIG. 3 is an exploded view of the reciprocating saw head;

FIG. 4 is a cross-sectional three-dimensional schematic view of a reciprocating saw head;

FIG. 5 is a cross-sectional plan view of the reciprocating saw head;

FIG. 6 is a schematic cross-sectional view taken along the direction A-A in FIG. 5;

FIG. 7 is a schematic cross-sectional view taken along the direction B-B in FIG. 5;

FIG. 8 is a schematic structural view of a pendulum rod bearing assembly;

FIG. 9 is a schematic view of the structure of the joint cover;

fig. 10 is a schematic structural view of a side fastener.

[ detailed description ] of the invention

The technical solutions of the embodiments of the present invention will be explained and illustrated below with reference to the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, and not all embodiments. Based on the examples in the implementation manner, other examples obtained by a person skilled in the art without making creative efforts fall within the protection scope of the present invention.

As shown in fig. 1 to 2, the present embodiment is a multi-headed electric tool, including a handheld body 1, and a driving motor disposed in the handheld body 1, the driving motor is connected with an output shaft 10, the output shaft 10 extends out of the front end of the handheld body 1, an external thread is disposed on a circumferential side of the output shaft 10, in the present embodiment, the external thread is in a right-handed direction, a replaceable working head is screwed on the output shaft 10, and the working head is a reciprocating saw head 2 or a drill chuck 3. The hand-held machine body 1 is provided with two machine heads in a general way, so that users can save money more without repeatedly buying the hand-held machine body 1, manufacturers can produce the hand-held machine body 1 in a large scale, the traditional drill chuck 3 and the reciprocating saw machine head 2 are respectively corresponding to different hand-held machine bodies, the production is carried out in a one-to-one correspondence manner, the mass production cannot be carried out, once an order is changed, parts are extremely easy to be backlogged, after the hand-held machine body 1 is arranged into the universal piece, the mass production can be carried out in a large scale, the limitation of the order can be avoided, and the production pressure is greatly reduced corresponding to the production.

In this embodiment, the working machine head and the handheld machine body 1 are connected through a threaded connection, firstly, the threaded connection is simple in structure and good in connection stability, and secondly, the output shaft 10 is driven by a motor to rotate, so that when the working machine head and the handheld machine body 1 are connected, the characteristic of rotation of the output shaft 10 can be utilized, the output shaft 10 can automatically realize the matched connection with the working machine head when rotating, and when the output shaft 10 rotates reversely, the dismounting of the working machine head can be automatically realized, and the operation is very convenient.

As shown in fig. 2, the specific connection mode of the hand-held machine body 1 and two kinds of machine heads is as follows:

when the working machine head is the drill chuck 3, the drill chuck 3 is provided with a second central hole 31 along the axial direction, the hole wall of the second central hole 31 is provided with threads which are matched and meshed with the external threads of the output shaft 10, and when the working machine head is installed, the peripheral side surface of the output shaft 10 is in threaded connection with the second central hole 31.

Since the drill chuck 3 is greatly affected by torsion in the working process, in order to prevent the drill chuck 3 from being separated from the output shaft 10 under the action of reverse torsion, the drill chuck 3 is further reinforced in this embodiment, the end face of the output shaft 10 is concaved with an inner hole 101, the wall of the inner hole 101 is provided with an inner thread, the inner hole 101 is screwed with an end face screw 32, when the peripheral side face of the output shaft 10 is connected with the second central hole 31, the end face screw 32 penetrates from the other end of the second central hole 31 and is screwed into the inner hole 101 of the output shaft 10, wherein the inner thread of the inner hole 101 is opposite to the outer thread of the output shaft 10 in the screwing direction, that is, the screwing direction of the end face screw 32 is left-handed, that is, the screwing direction of the drill chuck 3 is the screwing direction of the end face screw 32, so that when the drill chuck 3 is subjected to torsion in the screwing direction, the end face screw 32 is more screwed, thereby realizing the self-locking effect.

When the working machine head is the reciprocating saw machine head 2, the reciprocating saw machine head 2 is provided with a first center hole 41, the first center hole 41 is in threaded connection with the peripheral side surface of the output shaft 10, and as further fastening, in this embodiment, the front end surface of the handheld machine body 1 is provided with a positioning round table 12, the axis of the output shaft 10 is coaxial with the axis of the positioning round table 12, and the output shaft 10 extends out of the end surface of the positioning round table 12, the rear end surface of the reciprocating saw machine head 2 is provided with a positioning round groove 51 matched with the positioning round table 12, and when the reciprocating saw machine head is installed, the positioning round table 12 is embedded into the positioning round groove 51, and meanwhile the output shaft 10 is screwed into the first center hole 41.

The side fastener 21 for radially fixing the positioning round table 12 is arranged on the side wall of the positioning round groove 51, specifically, the reciprocating saw head 2 in this embodiment includes a head housing, the wall surface of the positioning round groove 51 is provided with a side locking hole 52, the head housing in this embodiment includes an upper housing 22, a lower housing 23 and a flexible glue sleeve 24, the side fastener 21 in this embodiment is a fastening screw connected in the side locking hole 52, and when the fastening screw is screwed, a radial extrusion force can be generated on the positioning round table 12, thereby achieving the fastening effect.

As a preferable mode of this embodiment, the fastening screw is provided with an annular protrusion 211 on the inner side end face facing the positioning round table 12, and the middle of the annular protrusion 211 is hollow, so that the contact area between the fastening screw and the peripheral side face of the positioning round table 12 can be increased, the friction force is larger, and the fastening effect is better. In addition, the side of the outer side of the fastening screw is provided with a hexagonal hole 212, because many screws of the reciprocating saw head 2 are hexagonal screws, a cylindrical hexagonal wrench is used for disassembling and assembling the hexagonal screws, so the hexagonal hole 212 is arranged on the fastening screw, the cylindrical hexagonal wrench can also penetrate through the hexagonal hole 212 to form a handle-like effect, the fastening screw is fastened, and the structure of the fastening screw can be seen in fig. 10.

In addition, since the angle of the cutting may be required when the reciprocating saw is actually operated, a dial is provided on the front end surface of the hand-held machine body 1, and an alignment mark 251 for aligning with the dial is provided on the rear end surface of the reciprocating saw head 2 for convenience in adjusting the angle. During adjustment, the fastening screw can be loosened, the reciprocating saw head 2 can be manually rotated at the moment, the alignment mark 251 corresponds to the scale on the scale disk in the rotation process, and after the adjustment to the target angle, the fastening screw is screwed down, so that the angle is fixed, and the oblique cutting of the target object can be realized even when the hand-held machine body 1 is vertically held.

As shown in fig. 3 to 7, which are specific developments of the internal structure of the reciprocating saw head 2, for convenience of description, the front and rear directions are defined in fig. 3, and the front and rear directions in the following description are the front and rear directions defined in reference to fig. 3:

the general structure of the reciprocating saw head 2 comprises a head housing, a reciprocating rod 6 arranged in the head housing and used for connecting a cutting saw blade 26, and a swing rod bearing assembly 4 connected between the reciprocating rod 6 and an output shaft 10 in a transmission mode, wherein the swing rod bearing assembly 4 is a mechanical bearing commonly used in the mechanical field and mainly used for converting rotary motion into reciprocating motion in the axial direction, in this embodiment, the rotation of the output shaft 10 is used for driving the reciprocating rod 6 to linearly run and finally driving the cutting saw blade 26 to reciprocally cut an object.

In this embodiment, the swing rod bearing assembly 4 includes a bearing inner core 42, a bearing outer ring 43 and a swing rod sleeve sleeved on the bearing inner core 42, the bearing inner core 42 is provided with a first central hole 41, the first central hole 41 is in threaded connection with the circumferential side surface of the output shaft 10, the bearing outer ring 43 is sleeved on the bearing inner core 42, the bearing outer ring 43 rotates in a circumferential plane, the swing rod sleeve rotates by an inclined guide rail on the circumferential side surface of the bearing inner core 42 to generate forward and backward swinging in an axial direction, the swing rod sleeve includes an annular part 44 and a swing rod column 45, the annular part 44 is sleeved on the inclined guide rail of the bearing inner core 42 through balls, the swing rod column 45 is a thin cylinder formed by radially extending the annular part 44, and a three-dimensional schematic view of the swing rod bearing assembly 4 can be seen in fig. 8.

The end of the swing rod column 45 is inserted with a columnar roller 61, the side part of the roller 61 is provided with a through insertion hole 611, the insertion hole 611 is in clearance fit with the swing rod column 45, two end faces of the roller 61 are provided with two roller pins 612 in win-win fit, the rear end part of the reciprocating rod 6 is provided with a roller groove 62, the left side and the right side of the roller groove 62 are provided with roller pin holes, the roller pins 612 of the roller 61 are arranged in the roller pin holes, the whole roller 61 is accommodated in the roller groove 62, and when the swing rod column 45 swings back and forth, the reciprocating rod 6 is driven to move back and forth through the roller pins 612, and as the swing rod column 45 swings at a certain angle in the swinging process, the roller pins 612 and the roller pin holes also rotate to a certain degree to reduce interference.

The main stress part of the whole swing rod bearing assembly 4 is concentrated at the end part of the swing rod column 45, namely the top part of the swing rod sleeve member, and the stress at the annular part 44 at the position far away from the end part of the swing rod column 45 is smaller, so that the swing rod sleeve member is uneven in stress in the swing process, so that the vibration in the swing process is larger, the stability is poor, in order to increase the balance of the swing rod sleeve member, the annular part 44 is connected with a stabilizing piece for reducing the vibration in the swing process of the swing rod sleeve member, and the annular part 44 far away from the end part side of the swing rod column 45 also bears a part of force so as to play a role in balancing the whole swing rod sleeve member, finally play the role in reducing the vibration effect of the swing rod bearing assembly 4, and effectively prolong the service life of the reciprocating saw head 2.

In this embodiment, the stabilizer is composed of two parts, wherein one part is a weight 441 provided on the annular portion 44, and the weight 441 is integrally formed with the annular portion 44 or is fixed on the annular portion 44. In this embodiment, the weight 441 is a weight extending radially outward from the annular portion 44, and the weight is used to balance the stress between the two ends, so as to reduce the vibration of the swing rod assembly caused by uneven stress at the two ends.

The other part of the stabilizer is a return spring provided between the end face of the annular portion 44 and the handpiece housing. In this embodiment, there are two return springs, namely, a front spring 46 and a rear spring 47, where the front spring 46 and the rear spring 47 are respectively disposed on different sides of the annular portion 44, and the return springs play two roles in this embodiment: firstly, the balance weight 441 plays a role in balancing the two ends of the swing rod sleeve, so that the vibration of the swing rod sleeve is reduced; on the other hand, the return spring has the functions of energy storage and energy release when being compressed or stretched, and when the annular part 44 swings to two limit positions, the return spring can provide a restoring force for the annular part 44, so that reciprocating power is provided for the reciprocating rod 6, and the work of the output shaft 10 on the swing bearing can be reduced to a certain extent.

The specific mounting structure of the reset spring and the swing rod bearing assembly 4 is as follows:

in this embodiment, an inner box 7 is disposed in the machine head casing, the top and the rear end of the inner box 7 are both open, the swing rod bearing assembly 4 is installed in the inner box 7, wherein the front end of the bearing inner core 42 is connected with a rotating shaft 421, a small bearing 422 is disposed between the rotating shaft 421 and the bearing inner core 42, a rotating shaft hole 71 for installing the rotating shaft 421 is disposed on the front side wall of the inner box 7, an arc inner wall 72 is disposed inside the inner box 7, the axis of the arc inner wall 72 and the axis of the rotating shaft hole 71 are in the same line, a connecting cover 5 is installed at the rear end of the inner box 7, the front end surface of the connecting cover 5 extends toward the inner box 7, the shape of the connecting cover inner ring wall 53 is matched with the arc inner wall 72, the axis of the connecting cover inner ring wall 53 and the axis of the arc inner wall 72 are in the same axis, a bearing groove 531 is formed inside the connecting cover wall 53, and the bearing outer ring 43 is embedded in the bearing groove 531.

The rear end face of the joint cover 5 extends to form a joint cover outer ring wall 54, the positioning round groove 51 is hollow in the joint cover outer ring wall 54, mounting through holes are formed in four corners of the joint cover 5, the rear end of the machine head shell is provided with a rear end cover 25, screws sequentially penetrate through the rear end cover 25 and the joint cover 5, and finally the rear end cover 25 and the joint cover 5 are fixed on the rear end face of the inner box body 7, and the concrete structure of the joint cover 5 can be seen in fig. 9.

After the assembly is completed, the front end and the rear end of the swing rod bearing assembly are supported, the front end is provided with the front side wall support of the inner box body 7, the rear end is provided with the joint cover 5 support, the stability is better after the two ends are supported, the jumping degree in the rotating process is small, in the embodiment, after the whole assembly, the axes of the joint cover inner ring wall 53, the rotating shaft hole 71 and the circular arc inner wall surface 72 are in the same straight line, the coaxiality is high, and the vibration in the operation process of the swing bearing assembly is very small.

Assembling a return spring: the bottom of the end face of the annular portion 44 is provided with two first spring grooves 442, the two first spring grooves 442 are respectively located at the front end face and the rear end face of the annular portion 44, in this embodiment, the shape of the first spring grooves 442 is in a bell mouth shape, a spherical protrusion 443 for positioning an inner ring of a return spring is arranged in the first spring grooves 442, a spring positioning column 73 is arranged on the front side wall of the inner box 7, one end of the front spring 46 is sleeved on the spring positioning column 73, the other end of the front spring 46 is positioned on the spherical protrusion 443, and the purpose of the bell mouth shape is to reduce the interference probability of the first spring grooves 442 and the front spring 46 in the swinging process of the annular portion 44 due to the inclined swinging of the annular portion 44. Of course, the spring positioning post 73 on the front side wall of the inner case 7 in this embodiment may be replaced by a second spring slot, and the front end of the front spring 46 may be accommodated in the second spring slot.

For the rear spring 47, a third spring slot is formed in the front end face of the connecting cover 5, one end of the rear spring 47 is embedded in the third spring slot 55, the other end of the rear spring 47 is embedded in the first spring slot 442, and the third spring slot 55 can be replaced by a spring positioning column.

It should be noted that, in this embodiment, the reset is performed by using a double spring, and those skilled in the art should also know that, in other embodiments, the reset may be performed by using a single spring, and such embodiments also fall within the protection scope of the present invention.

An inner case cover 74 is mounted on the top of the inner case body 7, the reciprocating bar 6 is mounted between the inner case cover 74 and the inner case body 7, in addition, in order to reduce friction force of the reciprocating bar 6 in the moving process, an upper friction sleeve 63 is arranged between the top of the reciprocating bar 6 and the inner case cover 74, a reciprocating bar backing plate 64 is arranged between the bottom of the reciprocating bar 6 and the top of the inner case body 7, and the upper friction sleeve 63 and the reciprocating bar backing plate 64 are made of wear-resistant materials. During assembly, the inner box cover 74 and the reciprocating rod backing plate 64 are simultaneously fixed together at the top of the inner box body 7 by screws, meanwhile, the inner box body 7 is fixed between the upper shell 22 and the lower shell 23, and after the upper shell 22 and the lower shell 23 are assembled, the soft rubber sleeve 24 is wrapped outside the upper shell 22 and the lower shell 23.

When the reciprocating saw machine head 2 is mounted on the handheld machine body 1, the positioning circular groove 51 is aligned with the positioning circular table 12, after alignment, because the positioning circular table 12 is coaxial with the output shaft 10, the output shaft 10 is correspondingly aligned with the first central hole 41 on the bearing inner core 42, a switch on the handheld machine body 1 is started, the output shaft 10 is started to rotate, the output shaft 10 is automatically mounted in the first central hole 41 by means of external threads on the peripheral side surface of the output shaft 10, after mounting, a user can finely adjust the mounting angle according to the cutting requirement of the user, and after adjustment, the side fastener 21 is used for locking.

When the reciprocating saw head 2 is disassembled, the output shaft 10 can be reversed by only loosening the side fastener 21 and then pressing the reversing switch on the hand-held machine body 1 under normal conditions, and the output shaft 10 can be automatically unscrewed from the first central hole 41 when being reversed. However, in many cases, after the reciprocating saw performs the cutting operation, the first central hole 41 in the bearing inner core 42 will often bite with the output shaft 10, when the output shaft 10 is reversed, the bearing inner core 42 will also be reversed, and the output shaft 10 cannot be screwed out of the first central hole 41, so that in order to prevent such a situation, a locking device is designed for the reciprocating lever 6 in this embodiment.

Specifically, the inner box 7 on be equipped with locking lever perforation 75, the movable link has locking lever 8 in the locking lever perforation 75, locking lever 8 is located the bottom of reciprocating lever 6 in this embodiment, and the bottom of reciprocating lever 6 is equipped with locking hole 65, and the top of locking lever 8 is equipped with spacing ring 81, the radial reaming in bottom of locking lever perforation 75 forms button groove 751, the bottom of locking lever 8 is equipped with button ring 82, button ring 82 and locking lever 8 releasable connection, button ring 82 holding is in button groove 751, and is equipped with button return spring 83 between button ring 82 and the roof of button groove 751.

When the disassembly is needed, a user can press the button ring 82, the button return spring 83 is compressed, so that the top of the locking rod 8 is inserted into the locking hole 65 to complete locking, the reciprocating rod 6 cannot move back and forth after being locked, the swing of the swing rod column 45 is limited, the bearing inner core 42 is also limited to rotate after the swing rod column 45 is limited, at the moment, when the output shaft 10 is reversed, the output shaft 10 is automatically unscrewed from the bearing inner core 42, the situation that the bearing inner core 42 is reversed is avoided, after the output shaft 10 is unscrewed, the button ring 82 is loosened, and the button ring 82 can be automatically returned under the action of the button return spring 83.

While the invention has been described in terms of embodiments, it will be appreciated by those skilled in the art that the invention is not limited thereto but rather includes the drawings and the description of the embodiments above. Any modifications which do not depart from the functional and structural principles of the present invention are intended to be included within the scope of the appended claims.

Claims

1. The reciprocating saw machine head comprises a machine head shell, a reciprocating rod arranged in the machine head shell and used for connecting a cutting saw blade, and a swing rod bearing assembly connected between the reciprocating rod and a driving source in a transmission way, wherein the swing rod bearing assembly comprises a bearing inner core, a bearing outer ring and a swing rod sleeve piece sleeved on the bearing inner core;

the stabilizing piece comprises a reset spring arranged between the end face of the annular part and the machine head shell;

the stabilizer also comprises a balance weight arranged on the annular part, and the balance weight and the annular part are integrally structured or fixed on the annular part.

2. The reciprocating saw head as defined in claim 1, wherein said return spring comprises a front spring and a rear spring, said front spring and rear spring being disposed on different sides of the annular portion, respectively.

3. The reciprocating saw head as defined in claim 1, wherein said annular portion is provided with a first spring slot for receiving said return spring, said first spring slot having a spherical protrusion for positioning an inner ring of the return spring therein.

4. The reciprocating saw head as defined in claim 1, wherein an inner housing is provided in said head housing, said swing rod bearing assembly is mounted in said inner housing, a front end of said bearing inner core is rotatably connected to a front wall surface of said inner housing via a rotation shaft, a joint cover is mounted on a rear wall of said inner housing, and a bearing groove for positioning said bearing outer ring is provided on said joint cover.

5. The head of the reciprocating saw as defined in claim 4, wherein the inner housing is provided with a shaft hole for positioning the shaft, an arc inner wall surface is provided in the inner housing, the inner housing is provided with a cover inner ring wall extending toward the inner housing to form the bearing groove, the cover inner ring wall is mounted on the arc inner wall surface in a matching manner, and axes of the cover inner ring wall, the shaft hole and the arc inner wall surface are in the same straight line.

6. The reciprocating saw head as defined in claim 4, wherein said return spring comprises a front spring and a rear spring, said front spring and rear spring being provided on different sides of said annular portion, respectively, said front side wall of said inner housing being provided with a second spring slot or spring retainer for mounting said front spring, said cover being provided with a third spring slot or spring retainer for mounting said rear spring.

7. The reciprocating saw head as defined in claim 4, wherein the top of the inner housing has an inner cover, the reciprocating lever is mounted between the inner cover and the inner housing, and a reciprocating lever pad is provided between the reciprocating lever and the inner housing.

8. The reciprocating saw head according to any one of claims 1 to 7, wherein a roller is inserted on the swing rod column, the roller is in clearance fit with the swing rod column, and the roller is hinged on the reciprocating rod through a pin shaft.