Reciprocating saw

Abstract

The reciprocating saw comprises a machine shell, a motor assembly contained in the machine shell, a transmission assembly connected to the motor assembly, a reciprocating rod assembly driven by the transmission assembly and a guide rail assembly supporting the reciprocating rod assembly, and the reciprocating rod assembly comprises a reciprocating rod and a sliding groove connected to the reciprocating rod. The sliding groove reciprocates along the guide rail assembly. The guide rail assembly comprises a guide rail and a sliding plate connected to the guide rail, the sliding groove moves along the surface of the sliding plate, the reciprocating saw comprises an elastic piece abutting against the sliding plate, and the elastic piece exerts force on the guide rail so that the sliding plate can be attached to the sliding groove. Therefore, the sliding groove and the sliding plate are continuously attached, swing of the reciprocating rod assembly in the moving process is reduced, and vibration and noise of the machine are reduced. And the reciprocating rod assembly is well attached to the sliding plate, so that abrasion is more uniform, and the service life is prolonged.

Description

[Technical Field]

[0001] This utility model relates to the field of power tool technology, and in particular to a reciprocating saw used in decoration, construction and other applications. [Background Technology]

[0002] A reciprocating saw is a type of power tool used for cutting materials such as wood and metal, and it is widely used in furniture and decoration industries. In actual operation, the motion conversion mechanism of the reciprocating saw converts the rotational motion of the motor assembly into the reciprocating motion of the reciprocating rod, thereby driving the saw blade to perform high-frequency cutting operations.

[0003] In order to ensure smooth operation of the reciprocating component, the reciprocating saw in the prior art uses a clearance fit between the reciprocating component and the support component. This results in vibration and noise between the reciprocating component and the support component during operation, affecting the user's operating comfort. This problem is most obvious at the maximum blade lifting setting.

[0004] Therefore, it is indeed necessary to provide an improved reciprocating saw to overcome the shortcomings of the existing technology. [Utility Model Content]

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a reciprocating saw that is comfortable to operate and has a long service life.

[0006] The present invention solves the existing technical problems by adopting the following technical solution: A reciprocating saw includes a housing, a motor assembly housed within the housing, a transmission assembly connected to the motor assembly, a reciprocating rod assembly driven by the transmission assembly, and a guide rail assembly supporting the reciprocating rod assembly. The reciprocating rod assembly includes a reciprocating rod and a slide groove connected to the reciprocating rod, the slide groove reciprocating along the guide rail assembly. The guide rail assembly includes a guide rail and a sliding plate connected to the guide rail, the slide groove moving along the surface of the sliding plate. The reciprocating saw includes an elastic member that presses against the sliding plate, the elastic member applying force to the guide rail so that the sliding plate abuts against the slide groove.

[0007] A further improvement is as follows: the guide rail includes a guide rail body and a receiving groove recessed from the end face of the guide rail body, one end of the elastic member abuts against the bottom of the receiving groove, and the other end abuts against the surface of the sliding plate.

[0008] A further improvement is that the sliding plate includes a first surface that contacts the elastic element and a second surface that contacts the groove, the first surface and the second surface having different coefficients of friction.

[0009] A further improvement is that the friction coefficient of the second surface is less than that of the first surface.

[0010] A further improvement is as follows: the sliding plate includes a pair of first portions abutting between the elastic member and the sliding groove, and a second portion connected between the pair of first portions, wherein the first surface and the second surface are disposed on the pair of first portions.

[0011] A further improvement is that the two ends of the slide are supported by a pair of the first parts.

[0012] A further improvement is that the second portion is bent and recessed relative to a pair of first portions to form a channel, and the reciprocating rod extends into the channel.

[0013] A further improvement is that the elastic element is a spring.

[0014] Compared with the prior art, the present invention has the following advantages: by setting an elastic element that presses against the sliding plate on the reciprocating saw, the elastic element applies force to the guide rail, causing the sliding plate to abut against the groove. Therefore, during the operation of the reciprocating saw, the groove and the sliding plate are kept in continuous contact, reducing the swaying of the reciprocating rod assembly during movement and greatly reducing the vibration and noise of the machine. At the same time, the good contact between the reciprocating rod assembly and the sliding plate makes the wear more uniform and helps to improve the service life. [Attached Image Description]

[0015] Figure 1 This is a schematic diagram showing the connection of the reciprocating saw of this utility model with the grid assembly and the dust collection assembly installed;

[0016] Figure 2 yes Figure 1 A sectional diagram of the reciprocating saw shown.

[0017] Figure 3 yes Figure 1 The diagram shows the connection between the guide rail assembly and the reciprocating rod assembly in the reciprocating saw.

Detailed Implementation Methods

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0019] The terminology used in this invention is for the purpose of describing specific embodiments only and is not intended to limit the invention. For example, terms such as "upper," "lower," "front," "rear," "left," and "right," which indicate orientation or positional relationship, are based solely on the orientation or positional relationship shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device / component referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0020] Please see Figure 1 and Figure 2As shown, the embodiment of this utility model relates to a reciprocating saw 100, on which a saw blade 200 is detachably mounted for sawing wood and the like. The reciprocating saw 100 includes a housing 1, a motor assembly 2 housed in the housing 1, a transmission assembly 3 connected to the motor assembly 2, a reciprocating rod assembly 4 driven by the transmission assembly 3, a guide rail assembly 5 supporting the reciprocating rod assembly 4, a clamping mechanism 7 mounted on the front end of the reciprocating rod assembly 4, a support shoe 8 for adjusting the extension length of the saw blade 200, a circuit board assembly 9 for controlling the operating state of the motor assembly 2, and a battery pack 300 for providing power to the motor assembly 2. The saw blade 200 is detachably mounted to the clamping mechanism 7. The motor assembly 2 drives the reciprocating rod assembly 4 to reciprocate via the transmission assembly 3, thereby driving the saw blade 200 to perform high-frequency motion.

[0021] In this embodiment, the aforementioned housing 1 includes a first housing 11 with a grip portion 13 formed at the rear end and a second housing 12 connected to the front end of the first housing 11. The grip portion 13 and the first housing 11 are spaced apart to form a space 14 for the user's hand to rest. A switch trigger 15 for triggering the motor assembly 2 is also provided on the grip portion 13. The battery pack 300 is installed at the bottom of the first housing 11, the motor assembly 2 is placed inside the first housing 11 and extends to the second housing 12, and the circuit board assembly 9 is arranged at a relatively inclined angle on the lower side of the motor assembly 2.

[0022] Please see Figure 2 As shown, a fan assembly 21 is mounted on the motor shaft of the aforementioned motor assembly 2. The housing 1 has an air inlet 18 near the circuit board assembly 9 and an air outlet 19 near the fan assembly 21. The fan assembly 21 is a centrifugal fan. The rotation of the motor assembly 2 drives the fan assembly 21 to operate at high speed, forming a cooling airflow channel that draws in air from the air inlet 18 and discharges air from the air outlet 19. The circuit board assembly 9 is located upstream of the cooling airflow channel, and the motor assembly 2 is located downstream. That is, the cooling airflow drawn in from the outside first flows through the circuit board assembly 9, then blows onto the motor assembly 2, and finally flows out from the air outlet 19.

[0023] In this embodiment, the transmission assembly 3, the reciprocating rod assembly 4, and the guide rail assembly 5 are all housed within the second housing 12. The support shoe 8 is installed and protrudes to the front end of the second housing 12. The end of the saw blade 200 is fixed to the clamping mechanism 7, and the middle part is also supported by the support shoe 8.

[0024] Please see Figure 2As shown, the transmission assembly 3 includes an intermediate shaft 31 housed within the gearbox housing, a large bevel gear 32 sleeved around the outer periphery of the intermediate shaft, a crank disc 34, an eccentric pin 33 connecting the large bevel gear 32 and the crank disc 34, a crank pin 35 connecting the crank disc 34 and the reciprocating rod 4, and a counterweight 36. The intermediate shaft 31 is rotatably mounted to the gearbox housing via bearings, and the intermediate shaft 31 is arranged approximately perpendicular to the motor shaft. The lower end of the large bevel gear 32 forms a bevel tooth, and the motor shaft meshes with the lower end of the large bevel gear 32, thereby transmitting the rotation of the motor assembly 2 to the transmission assembly 3. The large bevel gear 32 has a locating pin protruding upward from its end face, and the locating pin is located on the central axis of the intermediate shaft 31. The eccentric pin 33 is interference-fitted into the large bevel gear 32, and the eccentric pin 33 is offset from the central axis of the intermediate shaft 31. The crank disc 34 is connected to the large bevel gear 32 via the locating pin and the eccentric pin, and the crank disc 34 rotates eccentrically around the motor shaft.

[0025] Furthermore, the aforementioned crank disc 34 has an eccentric portion protruding downward from its lower end and a crank portion protruding upward from its upper end. The eccentric portion and the crank portion are located on both sides of the end face of the crank disc 34 and are distributed on both sides of the plane containing the central axis of the intermediate shaft 31. A counterweight 36 is fitted around the outer periphery of the eccentric portion, driving the counterweight 36 to reciprocate approximately along the axial direction of the motor shaft. A crank pin 35 is installed on the crank portion and connected to the reciprocating rod assembly 4, driving the reciprocating rod assembly 4 to reciprocate approximately along the axial direction of the motor shaft.

[0026] Preferably, a needle roller bearing and a bushing are fitted around the outer periphery of the crank pin 35, and the crank pin 35 and the eccentric part drive the reciprocating rod assembly 4 and the counterweight 36 to move in opposite directions, so as to reduce the vibration and noise of the reciprocating saw 100 during operation.

[0027] Please refer to the following: Figure 2 As shown, the reciprocating saw 100 also includes a blade lifting mechanism 10 that drives the reciprocating rod assembly 4 to swing, for driving the reciprocating rod assembly 4 to swing axially along the intermediate shaft 31. The blade lifting mechanism 10 has a blade lifting wheel and a blade lifting pin connected to the blade lifting wheel. The blade lifting pin can adjust whether the blade lifting wheel abuts against or disengages from the large gear 32. The upper end face of the large gear 32 is cam-shaped. When the blade lifting wheel abuts against the large gear 32, the rotation of the large gear 32 can drive the blade lifting wheel to move along the axial direction of the intermediate shaft 31, thereby driving the reciprocating rod assembly 4 to swing.

[0028] In this embodiment, the motor assembly 2 is a DC brushless motor. The circuit board assembly 9 is electrically connected between the battery pack 300 and the motor assembly 2. The circuit board assembly 9 controls the energy supply of the battery pack 300 to the motor assembly 2. The switch trigger 15 is also electrically connected to the circuit board assembly 9. When the user presses the switch trigger 15, a signal is generated to the circuit board assembly 9, thereby controlling the operation of the motor assembly 2.

[0029] Please see Figure 3As shown, the reciprocating rod assembly 4 includes a reciprocating rod 41 and a groove 42 connected to the reciprocating rod 41. A crank pin 35 is installed in the groove 42 and drives the reciprocating rod 41 and the groove 42 to reciprocate along the guide rail assembly 5. The guide rail assembly 5 includes a guide rail 51 and a sliding plate 52 connected to the guide rail 51. The groove 42 moves along the surface of the sliding plate 52. The reciprocating saw 100 also includes an elastic element 6 that presses against the sliding plate 52. The elastic element 6 applies force to the guide rail 5 so that the sliding plate 52 abuts against the groove 42. Therefore, during operation, the groove 42 and the sliding plate 52 maintain continuous contact, reducing the swaying of the reciprocating rod assembly 4 during movement and greatly reducing machine vibration and noise. Simultaneously, the good contact between the reciprocating rod assembly 4 and the sliding plate 52 results in more uniform wear, which is beneficial for improving service life.

[0030] In this embodiment, the elastic element 6 is a spring.

[0031] In this embodiment, the guide rail 51 includes a guide rail body 511 and a receiving groove 512 recessed from the end face of the guide rail body 511. One end of the elastic member 6 abuts against the bottom of the receiving groove 512, and the other end abuts against the surface of the sliding plate 52.

[0032] The aforementioned sliding plate 52 includes a first surface 521 that contacts the elastic element 6 and a second surface 522 that contacts the sliding groove 42, and the first surface 521 and the second surface 522 have different coefficients of friction. Furthermore, the coefficient of friction of the second surface 522 is less than that of the first surface 521, resulting in less friction during the contact between the sliding groove 42 and the sliding plate 52.

[0033] In this embodiment, the sliding plate 52 includes a pair of first portions 525 abutting between the elastic member 6 and the slide groove 42 and a second portion 526 connected between the pair of first portions 525. The first surface 521 and the second surface 522 are disposed on the pair of first portions 525, and the two ends of the slide groove 42 are supported on the pair of first portions 525.

[0034] Furthermore, the second part 526 is bent and recessed relative to the pair of first parts 525 to form a channel 528, and the reciprocating rod 41 extends into the channel 528 and reciprocates within the channel 528.

[0035] This invention provides an elastic element 6 on the reciprocating saw 100 that presses against the sliding plate 52. The elastic element 6 applies force to the guide rail 5, causing the sliding plate 52 to abut against the groove 42. Therefore, during operation, the groove 42 and the sliding plate 52 maintain continuous contact, reducing the swaying of the reciprocating rod assembly 4 during movement and greatly reducing machine vibration and noise. At the same time, the good contact between the reciprocating rod assembly 4 and the sliding plate 52 makes the wear more uniform and helps to improve the service life.

[0036] This utility model is not limited to the specific embodiments described above. Those skilled in the art will readily understand that many other alternatives to the reciprocating saw of this utility model can be derived without departing from the principles and scope of this utility model. The scope of protection of this utility model is determined by the claims.

Claims

1. A reciprocating saw, comprising a housing, a motor assembly housed within the housing, a transmission assembly connected to the motor assembly, a reciprocating rod assembly driven by the transmission assembly, and a guide rail assembly supporting the reciprocating rod assembly, wherein the reciprocating rod assembly includes a reciprocating rod and a slide groove connected to the reciprocating rod, the slide groove reciprocating along the guide rail assembly; characterized in that: The guide rail assembly includes a guide rail and a sliding plate connected to the guide rail. The slide groove moves along the surface of the sliding plate. The reciprocating saw includes an elastic member that presses against the sliding plate. The elastic member applies force to the guide rail so that the sliding plate abuts against the slide groove.

2. The reciprocating saw according to claim 1, characterized in that: The guide rail includes a guide rail body and a receiving groove recessed from the end face of the guide rail body. One end of the elastic member abuts against the bottom of the receiving groove, and the other end abuts against the surface of the sliding plate.

3. The reciprocating saw according to claim 2, characterized in that: The sliding plate includes a first surface that contacts the elastic element and a second surface that contacts the groove, the first surface and the second surface having different coefficients of friction.

4. The reciprocating saw according to claim 3, characterized in that: The coefficient of friction of the second surface is less than that of the first surface.

5. The reciprocating saw according to claim 3, characterized in that: The sliding plate includes a pair of first portions abutting between the elastic member and the groove, and a second portion connecting the pair of first portions, wherein the first surface and the second surface are disposed on the pair of first portions.

6. The reciprocating saw according to claim 5, characterized in that: The two ends of the chute are supported by a pair of the first portions.

7. The reciprocating saw according to claim 5, characterized in that: The second portion is bent and recessed relative to a pair of first portions to form a channel, into which the reciprocating rod extends.

8. The reciprocating saw according to claim 1, characterized in that: The elastic element is a spring.

Images