Reciprocating saw

Abstract

The invention discloses a reciprocating saw, which belongs to the field of electric tools, solves the problem of overlarge load after a saw blade of the reciprocating saw is clamped, and adopts the technical scheme that the reciprocating saw mainly comprises a driver, a transmission gear, an eccentric wheel and a reciprocating rod, an output shaft of the driver is in transmission connection with the transmission gear, and the eccentric wheel is in transmission connection with the reciprocating rod; the transmission gear drives the eccentric wheel to rotate to achieve reciprocating motion of the reciprocating rod, one of the transmission gear and the eccentric wheel is provided with an elastic limiting piece, the other one of the transmission gear and the eccentric wheel is provided with a limiting groove, and one end of the elastic limiting piece extends into the limiting groove and is matched with the limiting groove in a limiting mode so that the transmission gear can drive the eccentric wheel to rotate. The elastic limiting piece elastically deforms to be separated from the limiting groove, so that the transmission gear and the eccentric wheel rotate relatively. Unloading can be carried out mainly through cooperation of the elastic limiting piece and the limiting groove when movement of the reciprocating rod is blocked.

Description

Technical Field

[0001] The invention discloses a reciprocating saw and belongs to the technical field of electric tools. Background Art

[0002] A reciprocating saw is an electric tool that uses a reciprocating saw blade to saw. A reciprocating saw is a type of electric saw, generally consisting of a housing, a drive motor, a transmission gear, an eccentric wheel, and a reciprocating rod. When the reciprocating saw is working, the drive motor drives the transmission gear to rotate, the transmission gear drives the eccentric wheel to rotate, and the reciprocating rod reciprocates under the drive of the eccentric wheel, thereby enabling the saw blade to saw.

[0003] However, when the existing reciprocating saw is cutting thicker and harder wood, the saw blade of the reciprocating saw is easily stuck in the wood. Once the saw blade is stuck, the reciprocating rod, eccentric wheel and transmission gear cannot move normally, which will cause the load of the reciprocating saw to increase significantly, easily affecting the service life of the reciprocating saw, and posing a major safety hazard. Summary of the invention

[0004] The purpose of the present invention is to solve the problem of excessive load when the saw blade of a reciprocating saw is stuck. To this end, a reciprocating saw is provided, in which the cooperation between an elastic limiter and a limit groove can unload the reciprocating rod when the movement of the reciprocating rod is blocked.

[0005] To solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A reciprocating saw comprises a driver, a transmission gear, an eccentric wheel and a reciprocating rod. The output shaft of the driver is transmission-connected with the transmission gear, the eccentric wheel is transmission-connected with the reciprocating rod, the transmission gear drives the eccentric wheel to rotate to realize the reciprocating motion of the reciprocating rod, one of the transmission gear and the eccentric wheel is provided with an elastic limiter, and the other is provided with a limit groove, one end of the elastic limiter extends into the limit groove and cooperates with the limit groove to realize the transmission gear driving the eccentric wheel to rotate, when the motion of the reciprocating rod is obstructed, the elastic limiter undergoes elastic deformation and disengages from the limit groove, so that the transmission gear and the eccentric wheel rotate relative to each other.

[0007] The beneficial effects of adopting the present invention are:

[0008] The present invention provides an elastic limit piece and a limit groove between the transmission gear and the eccentric wheel respectively, the elastic limit piece extends into the limit groove and cooperates with the limit groove. When the reciprocating rod operates normally, the driver drives the transmission gear to rotate, and the transmission gear drives the eccentric wheel to rotate through the cooperation of the elastic limit piece and the limit groove. During the rotation of the eccentric wheel, the reciprocating rod is controlled to perform reciprocating motion, thereby realizing the reciprocating rod controlling the saw blade to perform sawing; and when the saw blade is stuck, the movement of the reciprocating rod is blocked, and the eccentric wheel cannot rotate normally due to the obstruction of the reciprocating rod. During this process, the driver always maintains an output state, and the power output by the driver will be transmitted to the connection between the transmission gear and the eccentric wheel. The transmission gear cannot drive the eccentric wheel to rotate, so as to increase the load of the driver. The driver will increase the driving force on the transmission gear. When the transmission gear When the force of the wheel pair elastic limit piece is greater than the elastic force of the elastic limit piece, the elastic limit piece will be deformed and disengaged from the limit groove, thereby releasing the limit cooperation between the elastic limit piece and the limit groove, so that relative rotation can be generated between the transmission gear and the eccentric wheel, thereby reducing the load of the driver, reducing the possibility of damage to the driver due to long-term operation under excessive load, and helping to extend the service life of the driver; secondly, after the transmission gear and the eccentric wheel rotate relative to each other, the driving force exerted on the eccentric wheel and the reciprocating rod can also be reduced, reducing the possibility of breakage of the reciprocating rod and the saw blade, making the use of the reciprocating saw safer and more reliable; in addition, the transmission gear transmits power to the eccentric wheel through the elastic limit piece and the limit groove, which can reduce the vibration exerted on the eccentric wheel during the power transmission process, and can have a buffering and shock-absorbing effect.

[0009] Preferably, the elastic reset member comprises a connecting portion and an abutting portion, the connecting portion is mounted on the eccentric wheel, the limiting groove is arranged on the transmission gear, and the abutting portion extends into the limiting groove.

[0010] Preferably, the eccentric wheel and the transmission gear are arranged along the axial direction of the output shaft, the connecting end of the elastic limiter is fixed to the side of the eccentric wheel facing the transmission gear, and the abutment portion extends into the limit groove along the axial direction of the transmission gear.

[0011] Preferably, a receiving groove for receiving the eccentric wheel is provided in the middle of the transmission gear, the elastic limiting member is fixed to the outer peripheral side of the eccentric wheel, the limiting groove is arranged on the inner wall of the containing groove, and the abutting portion extends into the limiting groove along the radial direction of the transmission gear. With the above-mentioned technical solution, the eccentric wheel is received in the receiving groove of the transmission gear, and the elastic limiting member extends into the limiting groove along the radial direction, thereby reducing the space occupied by the transmission gear and the eccentric wheel in the axial direction, and effectively improving the utilization rate of the transmission gear and the eccentric wheel to the internal space of the reciprocating saw, making the overall volume of the reciprocating saw more compact, and facilitating the storage and transportation of the reciprocating saw; in addition, the elastic force direction of the elastic limiting member is distributed along the radial direction of the eccentric wheel, which helps to reduce the possibility of axial displacement of the eccentric wheel and the transmission gear, making the assembly of the eccentric wheel and the transmission gear more stable and reliable, and ensuring the precise transmission of power.

[0012] Preferably, the eccentric wheel is equipped with a plurality of elastic limiters, which are distributed along the circumferential direction of the eccentric wheel. The elastic limiters include springs and balls. The outer peripheral side of the eccentric wheel is provided with mounting grooves distributed along the radial direction. One end of the spring abuts against the mounting groove to form the connecting end, and the other end acts on the ball. The ball extends into the limiting groove to form the abutting end. The above-mentioned technical scheme is adopted to set a plurality of elastic limiters, and the elastic limiters are distributed along the circumference of the eccentric wheel, so that the force on the eccentric wheel can be more uniform, and the possibility of damage to the eccentric wheel due to uneven force can be reduced; in addition, the abutting end of the elastic limiter adopts a ball, so that the abutting end and the limiting groove form rolling friction, thereby reducing the wear between the ball and the limiting groove, which helps to extend the service life of the ball and the limiting groove; secondly, the surface of the ball is a smooth spherical surface, so that the external force required for the ball to escape from the limiting groove is smaller, thereby reducing the maximum load of the driver and reducing the possibility of damage to the driver.

[0013] Preferably, the length of the ball extending into the installation groove is L, the radius of the ball is R, and L≥R. The aforementioned technical solution is adopted, that is, the depth of the ball extending into the limit groove is less than the radius of the ball. When the ball contacts the side wall of the limit groove, the surface of the ball can play a guiding role, thereby reducing the external force required for the ball to escape from the limit groove, making it easier for the ball to escape from the limit groove, thereby reducing the maximum load of the driver and reducing the possibility of damage to the driver; and when L<R, most of the ball extends into the limit groove, and the ball is easily stuck when it contacts the side wall of the limit groove, making it difficult for the ball to escape from the limit groove, thereby increasing the load of the driver, and causing the driver to be easily damaged due to excessive load.

[0014] Preferably, the width of the limit groove is H, the diameter of the ball is D, and H>D. With the above technical solution, when the ball passes through one limit groove and enters the next limit groove, the ball will slide for a distance in the limit groove before contacting the side wall, which helps the ball pass through the side wall of the limit groove and further reduces the external force required for the ball to escape from the limit groove.

[0015] Preferably, the edge of the notch of the limiting groove is provided with a guide surface for guiding the elastic limiting member to disengage from the limiting groove. With the above technical solution, the guide surface can guide the elastic limiting member, thereby reducing the external force required for the elastic limiting member to disengage from the limiting groove, reducing the maximum load of the driver, and reducing the possibility of damage to the driver.

[0016] Preferably, a positioning shaft is provided in the reciprocating saw, and the positioning shaft passes through the transmission gear and the eccentric wheel at the same time. Two bearings are mounted on the positioning shaft, and the transmission gear and the eccentric wheel are rotatably matched with the positioning shaft through the bearings.

[0017] Preferably, an eccentric column is fixedly mounted on the side of the eccentric wheel facing away from the transmission gear, and a waist-shaped hole is provided on the reciprocating rod for inserting the eccentric column. The rotation of the eccentric wheel realizes the reciprocating motion of the reciprocating rod through the cooperation between the eccentric column and the waist-shaped hole.

[0018] Other features and advantages of the present invention will be disclosed in detail in the following specific embodiments and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below in conjunction with the accompanying drawings:

[0020] Figure 1 It is a structural schematic diagram of a reciprocating saw of the present invention;

[0021] Figure 2 A cross-sectional view of a reciprocating saw according to the present invention;

[0022] Figure 3 An exploded view of the internal structure of a reciprocating saw of the present invention;

[0023] Figure 4 A cross-sectional view of an eccentric wheel in a reciprocating saw of the present invention;

[0024] Figure 5 for Figure 4 A partial enlarged view of part A.

[0025] Figure numerals: 1. housing; 2. driver; 21. output shaft; 22. positioning shaft; 221. bearing; 3. transmission gear; 31. accommodating groove; 32. limiting groove; 321. guide surface; 4. eccentric wheel; 41. eccentric column; 411. bushing; 42. mounting groove; 5. elastic reset member; 51. spring; 52. ball bearing; 6. reciprocating saw; 61. waist-shaped hole; 62. saw blade. DETAILED DESCRIPTION

[0026] The technical solutions of the embodiments of the present invention are explained and described below in conjunction with the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the protection scope of the present invention.

[0027] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0028] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly defined.

[0029] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] like Figures 1 to 5As shown, this embodiment shows a reciprocating saw 6, including a shell 1, a driver 2, a transmission gear 3, an eccentric wheel 4 and a reciprocating rod are arranged in the shell 1, wherein the output shaft 21 of the driver 2 is meshed with the transmission gear 3, thereby driving the transmission gear 3 to rotate, and an elastic limiter and a limit groove 32 are arranged between the transmission gear 3 and the eccentric wheel 4, the end of the elastic limiter extends into the limit groove 32 and cooperates with the limit groove 32 to achieve a transmission connection between the transmission gear 3 and the eccentric wheel 4, when the transmission gear 3 rotates, the eccentric wheel 4 is driven to rotate through the limit cooperation of the elastic limiter and the limit groove 32, the eccentric wheel 4 is transmission-connected with the reciprocating rod, and during the rotation of the eccentric wheel 4, the reciprocating rod is driven to reciprocate along the length direction of the reciprocating rod, and a saw blade 62 is fixedly connected to the end of the reciprocating rod, and the saw blade 62 extends out of the shell 1, and during the reciprocating motion of the reciprocating rod, the saw blade 62 is driven to saw.

[0031] The eccentric wheel 4 is locked and the drive gear 3 is in a state of being locked. The eccentric wheel 4 is driven to rotate to increase the load of the driver 2, and the driver 2 will increase the driving force on the transmission gear 3. When the force of the transmission gear 3 on the elastic limiter is greater than the elastic force of the elastic limiter, the elastic limiter will be deformed and disengaged from the limiter groove 32, thereby releasing the limit cooperation between the elastic limiter and the limiter groove 32, so that relative rotation can be generated between the transmission gear 3 and the eccentric wheel 4, thereby reducing the load of the driver 2 and reducing the possibility of damage to the driver 2 due to being in an overloaded operating state for a long time, which helps to extend the service life of the driver 2; secondly, after the transmission gear 3 and the eccentric wheel 4 rotate relative to each other, the driving force on the eccentric wheel 4 and the reciprocating rod can also be reduced, and the possibility of the reciprocating rod and the saw blade 62 breaking can be reduced, making the use of the reciprocating saw 6 safer and more reliable; in addition, the transmission gear 3 transmits power to the eccentric wheel 4 through the elastic limiter and the limiter groove 32, which can reduce the vibration of the eccentric wheel 4 during the power transmission process, and can play a buffering and shock-absorbing effect.

[0032] In this embodiment, the transmission gear 3 is provided with a receiving groove 31 for accommodating the eccentric wheel 4 in the middle part, and the inner wall of the receiving groove 31 is provided with a plurality of limiting grooves 32, and the limiting grooves 32 are evenly distributed along the circumference of the inner wall of the receiving groove 31. The outer peripheral side of the eccentric wheel 4 is provided with a plurality of mounting grooves 42, and the elastic limiting member includes a connecting end and an abutting end. The elastic limiting member is inserted into the mounting groove 42 through the connecting end and connected with the eccentric wheel 4, and the abutting end extends into the limiting groove 32 along the radial direction of the eccentric wheel 4 and cooperates with the limiting groove 32. The eccentric wheel 4 is accommodated in the receiving groove 31 of the transmission gear 3, and the elastic limiting member is provided with a plurality of mounting grooves 42. The limiting member extends into the limiting groove 32 in the radial direction, thereby reducing the space occupied by the transmission gear 3 and the eccentric wheel 4 in the axial direction, and can effectively improve the utilization rate of the internal space of the reciprocating saw 6 by the transmission gear 3 and the eccentric wheel 4, so that the overall volume of the reciprocating saw 6 is more compact, which is conducive to the storage and transportation of the reciprocating saw 6; in addition, the elastic force direction of the elastic limiting member is distributed along the radial direction of the eccentric wheel 4, which helps to reduce the possibility of axial displacement of the eccentric wheel 4 and the transmission gear 3, making the assembly of the eccentric wheel 4 and the transmission gear 3 more stable and reliable, and ensuring the accurate transmission of power.

[0033] Of course, it is understandable that in other embodiments, the limiting groove 32 may also be arranged on the outer peripheral side of the eccentric wheel 4 , and the corresponding elastic limiting member may also be installed in the receiving groove 31 of the transmission gear 3 .

[0034] Of course, it is understandable that in other embodiments, the eccentric wheel 4 and the transmission gear 3 can also be arranged along the axial direction of the output shaft 21, and the connecting end of the elastic limit member is fixed to the side of the eccentric wheel 4 facing the transmission gear 3, and the abutment portion extends into the limit groove 32 along the axial direction of the transmission gear 3.

[0035] The elastic limiting member described in this embodiment includes a spring 51 and a ball 52, one end of the spring 51 abuts against the mounting groove 42 to form the connecting end, and the other end acts on the ball 52, the ball 52 extends into the limiting groove 32 to form the abutting end, and the spring 51 can make the ball 52 have a movement tendency to extend into the limiting groove 32, which helps to improve the matching stability of the ball 52 and the limiting groove 32. In addition, the abutting end of the elastic limiting member adopts the ball 52, which can form rolling friction with the abutting end and thereby reduce the wear between the ball 52 and the limiting groove 32, which helps to extend the service life of the ball 52 and the limiting groove 32; secondly, the surface of the ball 52 is a smooth spherical surface, so that the external force required for the ball 52 to detach from the limiting groove 32 is smaller, thereby reducing the maximum load of the driver 2 and reducing the possibility of damage to the driver 2.

[0036] like Figure 4As shown, the diameter of the eccentric wheel 4 in this embodiment is relatively close to the diameter of the accommodating groove 31, that is, after the eccentric wheel 4 is installed in the accommodating groove 31, the distance between the outer peripheral side of the eccentric wheel 4 and the side wall of the accommodating groove 31 is small, so that the assembly of the eccentric wheel 4 and the transmission gear 3 can be more compact. In addition, the diameter of the ball 52 is smaller than the diameter of the notch of the mounting groove 42, that is, the ball 52 can be retracted into the mounting groove 42 as a whole, and the mounting groove 42 can provide sufficient avoidance space for the ball 52 so that the ball 52 can smoothly pass over the side wall of the limiting groove 32.

[0037] like Figure 5 As shown, in this embodiment, the length of the ball 52 extending into the mounting groove 42 is L, the radius of the ball 52 is R, and L≥R, that is, the depth of the ball 52 extending into the limiting groove 32 is less than the radius of the ball 52. When the ball 52 contacts the side wall of the limiting groove 32, the surface of the ball 52 can play a guiding role, thereby reducing the external force required for the ball 52 to escape from the limiting groove 32, making it easier for the ball 52 to escape from the limiting groove 32, thereby reducing the maximum load of the driver 2 and reducing the possibility of damage to the driver 2; and when L<R, most of the ball 52 extends into the limiting groove 32, and the ball 52 is easily stuck when contacting the side wall of the limiting groove 32, which makes it difficult for the ball 52 to escape from the limiting groove 32, thereby increasing the load of the driver 2, causing the driver 2 to be easily damaged due to excessive load.

[0038] like Figure 5 As shown, in this embodiment, the width of the limit groove 32 is H, the diameter of the ball 52 is D, and H>D. When the ball 52 passes over one limit groove 32 and enters the next limit groove 32, the ball 52 will slide a certain distance in the limit groove 32 before contacting the side wall, which helps the ball 52 pass over the side wall of the limit groove 32 and further reduces the external force required for the ball 52 to escape from the limit groove 32.

[0039] In order to further reduce the difficulty of the elastic limit member disengaging from the limit groove 32, the groove edge of the limit groove 32 described in this embodiment is provided with a guide surface 321 for guiding the elastic limit member to disengage from the limit groove 32. The guide surface 321 can guide the elastic limit member, thereby reducing the external force required for the elastic limit member to disengage from the limit groove 32, reducing the maximum load of the driver 2, and reducing the possibility of damage to the driver 2.

[0040] like Figure 2 and Figure 3As shown, in this embodiment, the output end of the driver 2 is connected to the output shaft 21 for transmission. The end surface of the output shaft 21 away from the driver 2 is provided with external teeth. A positioning shaft 22 is fixedly installed in the housing 1. The positioning shaft 22 passes through the transmission gear 3 and the eccentric wheel 4 at the same time. Two bearings 221 are mounted on the positioning shaft 22, one of which is assembled with the transmission gear 3, and the other is assembled with the eccentric wheel 4, so that the transmission gear 3 and the eccentric wheel 4 can rotate around the positioning shaft 22, and the teeth on the outer peripheral side of the transmission gear 3 are meshed with the external teeth of the output shaft 21, so that the output shaft 21 can drive the transmission gear 3 to rotate, and the transmission gear 3 is driven to rotate. The movable gear 3 cooperates with the limit groove 32 through the elastic reset member 5, so that the eccentric wheel 4 can rotate with the transmission gear 3. The surface of the eccentric wheel 4 facing away from the transmission gear 3 is provided with an eccentric column 41. The eccentric column 41 is eccentrically arranged with the eccentric wheel 4. A bearing 221 is installed on the eccentric column 41. The outer peripheral side of the bearing 221 is provided with a sleeve 411. The reciprocating rod is provided with a waist-shaped hole 61. The eccentric column 41 extends into the waist-shaped hole 61 so that the sleeve 411 cooperates with the waist-shaped hole 61. When the eccentric column 41 rotates with the eccentric wheel 4, the eccentric column 41 cooperates with the waist-shaped hole 61 to drive the reciprocating rod to reciprocate, and then drives the saw blade 62 to saw.

[0041] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes but is not limited to the contents described in the drawings and the above specific embodiments. Any modification that does not deviate from the functional and structural principles of the present invention will be included in the scope of the claims.

Claims

1. A reciprocating saw, comprising a driver, a transmission gear, an eccentric wheel and a reciprocating rod, wherein the output shaft of the driver is in transmission connection with the transmission gear, the eccentric wheel is in transmission connection with the reciprocating rod, the transmission gear drives the eccentric wheel to rotate to realize the reciprocating motion of the reciprocating rod, characterized in that: One of the transmission gear and the eccentric wheel is provided with an elastic limit piece, and the other is provided with a limit groove. One end of the elastic limit piece extends into the limit groove and cooperates with the limit groove to realize that the transmission gear drives the eccentric wheel to rotate. When the movement of the reciprocating rod is blocked, the elastic limit piece undergoes elastic deformation and disengages from the limit groove, so that the transmission gear and the eccentric wheel rotate relative to each other.

2. A reciprocating saw according to claim 1, characterized in that: The elastic reset member comprises a connecting portion and an abutting portion, wherein the connecting portion is mounted on the eccentric wheel, the limiting groove is arranged on the transmission gear, and the abutting portion extends into the limiting groove.

3. A reciprocating saw according to claim 2, characterized in that: The eccentric wheel and the transmission gear are arranged in an axial direction of the output shaft, the connecting end of the elastic limiter is fixed to a side of the eccentric wheel facing the transmission gear, and the abutment portion extends into the limiter groove along the axial direction of the transmission gear.

4. A reciprocating saw according to claim 2, characterized in that: The transmission gear is provided with a receiving groove for receiving the eccentric wheel in the middle part, the elastic limiting member is fixed to the outer peripheral side of the eccentric wheel, the limiting groove is arranged on the inner wall of the containing groove, and the abutting part extends into the limiting groove along the radial direction of the transmission gear.

5. A reciprocating saw according to claim 2, characterized in that: The eccentric wheel is equipped with multiple elastic limit members, which are distributed along the circumferential direction of the eccentric wheel. The elastic limit members include springs and balls. The outer peripheral side of the eccentric wheel is provided with mounting grooves distributed along the radial direction. One end of the spring abuts against the mounting groove to form the connecting end, and the other end acts on the ball. The ball extends into the limit groove to form the abutting end.

6. A reciprocating saw according to claim 5, characterized in that: The length of the ball extending into the installation groove is L, the radius of the ball is R, and L≥R.

7. A reciprocating saw according to claim 5, characterized in that: The width of the limiting groove is H, the diameter of the ball is D, and H>D.

8. A reciprocating saw according to claim 1, characterized in that: The edge of the groove opening of the limiting groove is provided with a guide surface for guiding the elastic limiting member to separate from the limiting groove.

9. A reciprocating saw according to claim 1, characterized in that: The reciprocating saw is provided with a positioning shaft, which passes through the transmission gear and the eccentric wheel at the same time. Two bearings are sleeved on the positioning shaft, and the transmission gear and the eccentric wheel are both rotatably matched with the positioning shaft through the bearings.

10. A reciprocating saw according to claim 1, characterized in that: An eccentric column is fixedly installed on the side of the eccentric wheel facing away from the transmission gear, and a waist-shaped hole for inserting the eccentric column is provided on the reciprocating rod. The eccentric wheel rotates through the cooperation between the eccentric column and the waist-shaped hole to realize the reciprocating motion of the reciprocating rod.

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