CN114309799A

CN114309799A - Reciprocating saw

Info

Publication number: CN114309799A
Application number: CN202011065885.5A
Authority: CN
Inventors: 禹田; 陶士春; 刘来; 刘可
Original assignee: Nanjing Chervon Industry Co Ltd
Current assignee: Nanjing Chervon Industry Co Ltd
Priority date: 2020-09-30
Filing date: 2020-09-30
Publication date: 2022-04-12
Anticipated expiration: 2040-09-30
Also published as: CN114309799B

Abstract

The invention belongs to the technical field of electric tools, and relates to a reciprocating saw which comprises a shell, a driving assembly, a gear box, a transmission assembly and an output component, wherein the driving assembly is positioned in the shell and comprises a motor extending along the vertical direction. The gear box is located in the housing. The transmission assembly is located the gear box, and transmission assembly includes driven gear and balancing piece, and driven gear's axis is on a parallel with the axis of motor, and driven gear is rotated by motor drive, and driven gear's upper and lower surface is provided with eccentric part and lower eccentric part respectively, goes up the eccentric part and is connected with the balancing piece. The output member includes a slide bar connected to the lower eccentric such that the slide bar reciprocates as the driven gear rotates. The reciprocating saw also comprises a supporting part which is contacted with the balance block and supports the balance block. The supporting part is arranged on the gear box, so that the balance block is separated from the driven gear, the vibration is reduced, the temperature rise of the gear box is reduced, and the performance stability of the reciprocating saw is improved.

Description

Reciprocating saw

Technical Field

The invention belongs to the technical field of electric tools, and particularly relates to a reciprocating saw.

Background

A reciprocating saw is a cutting tool that performs cutting by reciprocating movement of a saw blade coupled to an output member.

There exists a reciprocating saw that includes a housing, a motor, a drive assembly, and an output member, the motor, the drive assembly, and the output member all mounted within the housing. The transmission assembly comprises a first transmission gear, a second transmission gear and a balance block, the first transmission gear is arranged above the second transmission gear, the balance block is arranged between the first transmission gear and the second transmission gear, and the balance block is in direct contact with the first transmission gear and the second transmission gear. When the electric motor works, the motor drives the first transmission gear to rotate, the first transmission gear drives the second transmission gear to do eccentric motion, and the second transmission gear drives the output part to do reciprocating motion.

During the working process of the reciprocating saw, the balance block can reduce the vibration of the reciprocating saw to a certain extent. However, the conventional reciprocating saw still vibrates greatly and cannot meet the requirement, and in addition, abrasion occurs between the balance weight and the first transmission gear and between the balance weight and the second transmission gear.

Disclosure of Invention

It is an object of the present invention to provide a reciprocating saw that reduces vibration, lowers the temperature of the gear box, and extends the life of the reciprocating saw.

In order to achieve the purpose, the invention adopts the following technical scheme:

a reciprocating saw, comprising:

a housing;

a drive assembly located within the housing and including a motor having an axis extending in an up-down direction;

a gearbox located within the housing;

the transmission assembly is positioned in the gear box and comprises a driven gear and a balance block, the axis of the driven gear is parallel to the axis of the motor, the driven gear is driven by the motor to rotate, an upper eccentric part and a lower eccentric part are respectively arranged on the upper surface and the lower surface of the driven gear, and the upper eccentric part is connected with the balance block;

an output member including a slide bar connected with the lower eccentric such that the slide bar reciprocates when the driven gear rotates;

the reciprocating saw further comprises:

a support portion that contacts the weight and supports the weight; the supporting part is arranged on the gear box.

Preferably, in the reciprocating saw, the support portion includes a first support and a second support that are spaced apart from each other, the first support and the second support are both supported by the gear box, and the counterweight is supported by the first support and the second support.

Preferably, in the reciprocating saw, the gear box includes an upper box body and a lower box body which are connected in an involutory manner, and the driven gear is mounted on and suspended from the upper box body through a rotating shaft.

Preferably, in the above reciprocating saw, the rotating shaft is mounted to the upper case through a coupling member and a spacer.

Preferably, in the reciprocating saw, the reciprocating saw includes a positioning column installed on the gear box, the first support is a flat plate structure, an edge of the first support is recessed to form a positioning groove, and the positioning column is in positioning fit with the positioning groove.

Preferably, in the above-mentioned reciprocating saw, a driving gear is installed on a driving shaft of the motor, and the first support member is provided with a space for giving way to the driving gear.

Preferably, in the above reciprocating saw, the gear housing is mounted with a guide for guiding the slide bar, and the second support is supported by the guide.

Preferably, in the reciprocating saw, the second supporting member has a cylindrical structure.

Preferably, in the above reciprocating saw, a rolling axis of the second support is perpendicular to an axis of the motor.

It is another object of the present invention to provide a reciprocating saw that reduces vibration, lowers the temperature of the gear box, and extends the life of the reciprocating saw.

a reciprocating saw, comprising:

a housing;

a drive assembly located within the housing, the drive assembly including a motor;

a gearbox located within the housing;

the transmission assembly is positioned in the gear box and comprises a driven gear and a balance block, the driven gear is driven by the motor to rotate, the driven gear is provided with a first eccentric part and a second eccentric part, and the first eccentric part is connected with the balance block;

an output member including a slide bar connected with the second eccentric member such that the slide bar reciprocates when the driven gear rotates;

the reciprocating saw further comprises:

the first support and the second support are both supported on the gear box, and the balance block is supported on the first support and the second support;

the driven gear is suspended from the gear box.

The reciprocating saw has the beneficial effects that: the balance weight is separated from the driven gear, so that vibration in the working process of the reciprocating saw is reduced. In addition, because the balancing piece is separated from the driven gear, the abrasion between the balancing piece and the driven gear is eliminated, the performance stability of the reciprocating saw is improved, the temperature rise of the gear box during the operation of the reciprocating saw can be effectively reduced due to the reduction of the abrasion during the operation, and the service life of the reciprocating saw is effectively prolonged.

Drawings

FIG. 1 is an external perspective view of a reciprocating saw in accordance with an embodiment of the present invention;

FIG. 2 is an internal perspective view of a reciprocating saw in accordance with an embodiment of the present invention;

FIG. 3 is an enlarged view of a portion of FIG. 2 at I;

FIG. 4 is a half sectional view of a reciprocating saw in accordance with an embodiment of the present invention;

FIG. 5 is an enlarged view of a portion of FIG. 4 at II;

FIG. 6 is an exploded view of a gearbox according to an embodiment of the present invention;

fig. 7 is a matching view of the first support member, the driving gear and the positioning post according to the embodiment of the invention.

The component names and designations in the drawings are as follows:

the reciprocating saw 100, the housing 10, the first installation space 11, the second installation space 12, the third installation space 13, the switch button 14, the motor 20, the driving gear 22, the upper case 31, the lower case 32, the installation post 321, the installation hole 322, the driven gear 41, the rotating shaft 411, the limit flange 412, the balance weight 42, the upper eccentric member 43, the lower eccentric member 44, the mounting member 45, the sleeve 451, the disc 452, the slide rod 51, the guide member 52, the first support member 61, the relief space 611, the positioning groove 612, the second support member 62, and the positioning post 63.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

For convenience of description, the X direction is defined as a forward direction. The H direction is defined as the up-down direction.

FIG. 1 is an external perspective view of a reciprocating saw 100 in accordance with an embodiment of the present invention. FIG. 2 is an internal perspective view of a reciprocating saw 100 in accordance with an embodiment of the present invention. FIG. 4 is a half sectional view of a reciprocating saw 100 in accordance with an embodiment of the present invention. As shown in fig. 1, 2 and 4, the present embodiment discloses a reciprocating saw 100 having a housing 10 of the reciprocating saw 100 extending in a front-rear direction. The housing 10 forms a first installation space 11, a second installation space 12, and a third installation space 13 in this order from the rear to the front, and the first installation space 11 is installed with a power supply component, for example, a battery pack. The housing 10 enclosing the second installation space 12 forms a grip portion on which a switch knob 14 is provided, the switch knob 14 being provided at a position below one end of the grip portion near the third installation space 13. The driving assembly, the gear box, the transmission assembly and the output member are all installed in the third installation space 13, so that the third installation space 13 has a large size in the up-down direction.

The driving assembly includes a motor 20, and an axis of the motor 20 extends in an up-down direction. The transmission assembly is located in the gear box, the transmission assembly comprises a driven gear 41 and a balance block 42, the axis of the driven gear 41 is parallel to the axis of the motor 20, the driven gear 41 is driven by the motor 20 to rotate, the motor 20 is located at the rear upper position of the transmission assembly, and the transmission assembly is overlapped with the driving shaft part of the motor 20 in the projection of the front and rear directions, so that the size of the third installation space 13 in the upper and lower directions is favorably reduced.

The upper and lower surfaces of the driven gear 41 are respectively provided with an upper eccentric member 43 and a lower eccentric member 44, both the upper eccentric member 43 and the lower eccentric member 44 may be disc-shaped structures, and the upper eccentric member 43 is sleeved with a hole of the balance weight 42. The output member includes a slide rod 51, the slide rod 51 extending in the front-rear direction, and a saw blade mounted to the front end of the slide rod 51. A hole at the rear of the slide rod 51 is sleeved with the lower eccentric 44 so that the slide rod 51 reciprocates when the driven gear 41 rotates, thereby driving the saw blade to perform a cutting work. The present embodiment supports the counterbalance 42 through a gear box.

The transmission assembly of the existing reciprocating saw comprises a first transmission gear and a second transmission gear, and the two transmission gears are arranged up and down, so that the size of the third installation space 13 in the up-down direction is large. The present embodiment has only one driven gear 41, thereby reducing the size of the third installation space 13 in the up-down direction. The reciprocating saw 100 of the present embodiment is more compact than the prior art.

The balance block of the existing reciprocating saw is positioned between the first transmission gear and the second transmission gear, and the balance block is in direct surface contact with the first transmission gear and the second transmission gear, so that the vibration is large, and the abrasion is serious. The weight 42 of the present embodiment is supported by the gear case such that the weight 42 is separated from the driven gear 41, thereby reducing vibration during operation of the reciprocating saw 100. In addition, because the balance weight 42 is separated from the driven gear 41, the abrasion between the balance weight 42 and the driven gear 41 is eliminated, thereby improving the stability of the performance of the reciprocating saw 100 and effectively reducing the temperature rise of the gear box. Through testing, the temperature of the gearbox of the conventional reciprocating saw is about 100 degrees when the reciprocating saw operates, while the temperature of the gearbox of the reciprocating saw provided by the invention is 80 degrees to 90 degrees, so that the performance of the reciprocating saw 100 is improved, the service life of the reciprocating saw 100 is prolonged, and the service life of the reciprocating saw provided by the invention is twice as long as that of the conventional reciprocating saw.

In the present embodiment, the reciprocating saw 100 includes a first support 61 and a second support 62 spaced apart from each other, and the first support 61 and the second support 62 are two separate components. The first support 61 and the second support 62 are both supported by the gear box, and the counterweight 42 is simultaneously supported by the first support 61 and the second support 62. By providing two support members to support the balance weight 42, the support stability is good. Specifically, the first support 61 is disposed at the rear, and the second support 62 is disposed at the front. The first support 61 and the second support 62 may be distributed on the same line extending in the front-rear direction. In other embodiments, the number of the supporting members may be three or more, and the three or more supporting members may not be distributed along the front-rear direction. In other embodiments, the counterbalance 42 may be supported directly to the gearbox.

Fig. 5 is a partial enlarged view at II of fig. 4. FIG. 6 is an exploded view of a gearbox according to an embodiment of the present invention. As shown in fig. 4, 5 and 6, in the present embodiment, the gear box includes an upper box 31 and a lower box 32 connected in a butt joint, and the driven gear 41 is mounted on and suspended from the upper box 31 through a rotating shaft 411. Specifically, the driven gear 41 is mounted to the upper case 31 through the rotation shaft 411 and the mount 45. The mounting member 45 includes a sleeve 451 and a disc 452 coupled to a lower end of the sleeve 451, the disc 452 having a hole at a center thereof communicating with the sleeve 451.

In this embodiment, the rotating shaft 411 is provided with a limit flange 412, and the limit flange 412 is in limit fit with the upper case 31 to limit the upper limit position of the driven gear 41. Specifically, the sleeve 451 is installed on the upper case 31, the rotating shaft 411 is inserted into the hole at the center of the disc 452 and the sleeve 451, and the position-limiting flange 412 is limited by the disc 452. The limiting method for the upper limit position of the driven gear 41 is simple, and the whole limiting structure occupies a small space. The present embodiment can limit the lower limit position of the driven gear 41 by a screw. The upper and lower limit positions of the driven gear 41 are limited to mount the driven gear 41 to a predetermined position.

In this embodiment, the rotating shaft 411 is mounted to the upper case 31 through a coupling member (not shown) and a gasket (not shown). The connector may be a screw. At this time, the screw and the washer bear most of the weight of the driven gear 41 and the rotating shaft 411. In the present embodiment, the weight 42 is supported by the gear box instead of the driven gear 41, so that the weight borne by the screws and the washers can be reduced, which is beneficial to improving the service life of the screws and the washers and also improving the performance stability of the reciprocating saw 100.

The first support 61 and the second support 62 of the present embodiment have different structures, and the first support 61 and the second support 62 are matched with the counterweight 42 in different manners. In other embodiments, the first support 61 and the second support 62 may be identical in structure and may be engaged with the counterweight 42 in the same manner.

FIG. 3 is an enlarged view of a portion of FIG. 2 at I; fig. 7 is a matching view of the first support 61, the driving gear 22 and the positioning post 63 according to the embodiment of the present invention. As shown in fig. 3 and 7, in the present embodiment, the reciprocating saw 100 includes a positioning column 63 mounted on the gear box, and the first support 61 is a flat plate structure to reduce the occupied space. The edge of the first support 61 is recessed to form a positioning groove 612, and the positioning column 63 is in positioning fit with the positioning groove 612. The first support 61 supports the weight 42, and the weight 42 and the driven gear 41 are in a sliding friction fit in the process that the weight 42 eccentrically moves along with the driven gear 41.

Specifically, as shown in fig. 6, the bottom wall of the rear end portion of the lower case 32 is provided with a mounting post 321, and the mounting post 321 has an internal threaded hole. Accordingly, the first support 61 is provided with a mounting through-hole 613. The first support 61 is mounted to the mounting post 321 by a screw passing through the mounting through-hole 613. After the first supporting member 61 is mounted to the mounting post 321, it is supported on the upper surface of the lower box 32, so as to increase the supporting area and improve the reliability of the first supporting member 61 for supporting the balance weight 42.

As shown in fig. 6 and 7, the rear end of the lower case 32 is further provided with two mounting holes 322, and the two mounting holes 322 are symmetrically distributed in the left-right direction. Wherein the left-right direction is perpendicular to the up-down direction and the front-back direction. The two positioning posts 63 penetrate the two mounting holes 322 from bottom to top respectively and are fixed on the lower box 32. The upper portion of the positioning post 63 extends out of the mounting hole 322 and is in positioning fit with the positioning groove 612 of the first support 61. The end surface of the positioning post 63 may be polygonal, for example, regular hexagon or regular octagon. The positioning groove 612 may be a semicircular groove.

As shown in fig. 3, in the present embodiment, a driving gear 22 is mounted to a lower end of a driving shaft of the motor 20, and the driving gear 22 is engaged with the driven gear 41 such that the driven gear 41 rotates along with the driving gear 22. The first support 61 is provided with a relief space 611 for relieving the driving gear 22 to reduce an occupied space. The relief space 611 may be a semicircular groove formed by recessing from the edge of the first support 61. The relief space 611 is located in front of the positioning groove 612. A gap is provided between the inner wall of the escape space 611 and the driving gear 22 so as not to block the rotation of the driving gear 22.

As shown in fig. 2 and 4, in the present embodiment, the gear case is mounted with a guide 52 that guides the slide rod 51, and the second support 62 is supported by the guide 52. The guide 52 may be a guide bearing. The guide bearing can not only guide the slide rod 51 but also serve to mount and support the second support 62. The clearance between the guide bearing and the counterweight 42 is relatively small, for example, the clearance may be 1 mm. Not only can space be saved, but also the guide bearing can be ensured not to block the movement of the balance block 42.

In the present embodiment, the second supporting member 62 has a cylindrical structure, and may be a cylindrical pin or a square pin. Specifically, the second supporting member 62 may be a cylindrical structure and rotatably mounted on the upper surface of the guide bearing, and optionally, the second supporting member 62 may be smaller in size than the first supporting member 61. Alternatively, the present embodiment enables the second supporting member 62 to be in rolling engagement with the counterweight 42, so that the counterweight 42 can move more smoothly and stably.

In the present embodiment, the rolling axis of the second support 62 is perpendicular to the axis of the motor 20, so as to further improve the smoothness and stability of the movement of the counterweight 42.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A reciprocating saw, comprising:

a housing;

a gearbox located within the housing;

characterized in that, the reciprocating saw still includes:

2. The reciprocating saw as defined in claim 1, wherein said support portion includes first and second spaced supports, said first and second supports each being supported by said gear box, said counterbalance being supported by said first and second supports.

3. The reciprocating saw as defined in claim 2, wherein said gear box includes an upper box and a lower box connected in a butt-joint manner, said driven gear being mounted on and suspended from said upper box through a rotating shaft.

4. The reciprocating saw as defined in claim 3, wherein said spindle is mounted to said upper housing by a connector and a spacer.

5. The reciprocating saw as defined in claim 2, wherein said reciprocating saw includes a positioning post mounted to said gear box, said first support is a flat plate structure, and an edge of said first support is recessed to form a positioning groove, and said positioning post is positioned and engaged with said positioning groove.

6. The reciprocating saw as defined in claim 2, wherein a driving gear is installed on a driving shaft of said motor, and said first supporter is provided with a concession space for conceding said driving gear.

7. The reciprocating saw as defined in claim 2, wherein said gear box mounts a guide guiding said slide bar, said second support being supported by said guide.

8. The reciprocating saw as defined in claim 2 or 7, wherein said second support is a cylindrical structure.

9. The reciprocating saw as defined in claim 8, wherein a rolling axis of said second support is perpendicular to an axis of said motor.

10. A reciprocating saw, comprising:

a housing;

a gearbox located within the housing;

characterized in that, the reciprocating saw still includes:

the driven gear is suspended from the gear box.