CN216177205U - Reciprocating mechanism and reciprocating saw - Google Patents

Abstract

The utility model discloses a reciprocating mechanism and a reciprocating saw, wherein the reciprocating mechanism is arranged in a shell of an electric tool and comprises a power source and a transmission mechanism, the transmission mechanism is provided with a transmission wheel, a transmission pin, a transmission rod and a balance weight, the transmission pin is eccentrically arranged on the transmission wheel and connected with the balance weight, and the gravity center of the balance weight and the transmission pin are positioned on two opposite sides of the central axis of the transmission wheel; one end of the transmission rod is rotatably connected with the transmission pin, the other end of the transmission rod is pivoted with a reciprocating rod, and the reciprocating rod is driven by the power source to reciprocate towards a first direction vertical to the central axis of the transmission wheel; the counterweight rotates around the central axis of the driving wheel under the driving of the driving pin, and the gravity center of the counterweight counteracts the inertia moment of the reciprocating rod on the driving mechanism in the first direction when rotating; the reciprocating mechanism comprises a balance block arranged above the transmission mechanism, and the balance block moves along a second direction perpendicular to the first direction under the driving of the transmission pin so as to counteract the inertia moment of the transmission mechanism in the second direction when the gravity center of the balance block rotates.

Description

Reciprocating mechanism and reciprocating saw

Technical Field

The present invention relates to the field of power tools.

Background

For reciprocating type electric tools, due to the periodic reciprocating motion of the reciprocating rod and the chuck, unbalanced forces in the direction of the reciprocating rod are introduced, which is the main cause of the product vibrating the jawed hand during idling and moving. In order to solve the problem of vibration numbness caused by the reciprocating unbalanced force, another acting force opposite to the unbalanced force of the reciprocating rod is generally introduced to counteract the problem.

In order to balance the reciprocating unbalanced force of the reciprocating rod and the chuck in the current market, a balancing weight is added on the transmission gear, and the balancing function is realized by the centrifugal force of the balancing weight.

But the centrifugal force of the balance weight of the transmission gear is in the direction of 360 degrees around the rotating shaft, and the unbalanced force along the moving direction of the reciprocating rod is counteracted, and meanwhile, another unbalanced force perpendicular to the moving direction of the reciprocating rod is also introduced. Therefore, the scheme cannot completely realize the unbalance of the whole machine, so that the vibration and the hand numbness cannot be effectively reduced or completely eliminated.

Disclosure of Invention

In order to solve the problems, the utility model provides a reciprocating mechanism and a reciprocating saw.

In order to achieve the purpose, the technical scheme of the utility model is as follows:

a reciprocating mechanism mounted within a housing of a power tool, comprising:

a power source;

the transmission mechanism is in transmission connection with the power source and is provided with a transmission wheel, a transmission pin, a transmission rod and a balance weight, wherein the transmission pin is eccentrically arranged on the transmission wheel and is connected with the balance weight, and the gravity center of the balance weight and the transmission pin are respectively positioned on two opposite sides of the central axis of the transmission wheel; one end of the transmission rod is rotatably connected with the transmission pin, the other end of the transmission rod is pivoted with a reciprocating rod, and the reciprocating rod is configured to reciprocate towards a first direction perpendicular to the central axis of the transmission wheel under the driving of the power source;

the counterweight is configured to rotate around the central axis of the driving wheel under the driving of the driving pin, and the gravity center of the counterweight counteracts the inertia moment of the reciprocating rod on the driving mechanism in the first direction when rotating;

the reciprocating mechanism further comprises a balance weight arranged above the transmission mechanism, and the balance weight is configured to move along a second direction perpendicular to the first direction under the driving of the transmission pin so as to counteract the inertia moment on the transmission mechanism in the second direction when the gravity center of the balance weight rotates.

Preferably, a guide mechanism is arranged above the transmission mechanism along the movement direction of the balance block, and the balance block is movably arranged in the guide mechanism.

Preferably, the guide mechanism has a bottom plate and two guide rails symmetrically arranged along two sides of the bottom plate, and two sides of the balance weight are provided with limit blocks corresponding to the guide rails.

Preferably, the middle part of the balance piece is provided with a guide groove along a first direction, and the transmission pin is arranged in the guide groove in a penetrating manner to drive the balance piece to move towards a second direction.

Preferably, the end of the drive pin located in the guide groove is provided with a bearing.

Preferably, the housing is provided with a stopper along a first direction, so that the reciprocating rod reciprocates along the first direction.

A reciprocating saw having a reciprocating mechanism as described above.

Compared with the prior art, the utility model has the beneficial effects that:

1. the utility model reduces the vibration quantity in other directions caused by the balance weight by arranging the balance weight, and improves the use hand feeling of the device.

2. Compared with other transmission schemes, the crank connecting rod structure adopted by the utility model has the advantages of simple structure, lower process cost and higher reliability.

3. The end part of the driving pin, which is positioned in the guide groove, is sleeved with the bearing, and the sliding friction of the bearing can be changed into rolling friction when the driving pin moves in the guide groove, so that the friction between the driving pin and the inner wall of the guide groove is greatly reduced, and the service life of the driving pin is prolonged.

Drawings

The utility model is further described with reference to the following figures and detailed description.

FIG. 1 is a schematic perspective view of a reciprocating mechanism according to an embodiment of the present invention;

FIG. 2 is a front view of a reciprocator in an embodiment of the utility model;

FIG. 3 is a top view of a reciprocating mechanism in an embodiment of the present invention;

FIG. 4 is a schematic perspective view (with a portion removed) of a reciprocating mechanism according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a counterweight according to an embodiment of the present invention;

FIG. 6 is a schematic perspective view (with parts added) of a reciprocating mechanism according to an embodiment of the present invention;

FIG. 7 is a schematic view of an assembly of a weight and a guide mechanism according to an embodiment of the present invention.

In the figure: 1. a housing; 11. a limiting member; 2. a power source; 3. a transmission mechanism; 31. a driving wheel; 32. a drive pin; 321. a bearing; 33. a transmission rod; 34. balancing weight; 4. a reciprocating lever; 5. a counterbalance; 51. a guide groove; 52. a limiting block; 6. a guide mechanism; 61. a base plate; 62. a guide rail; A. a first direction; B. a second direction.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the utility model, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It will be appreciated by those skilled in the art that features from the examples and embodiments described below may be combined with each other without conflict.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. Words such as "upper," "lower," "front," "rear," and the like, which indicate orientation or positional relationship, are based only on the orientation or positional relationship shown in the drawings and are merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices/elements must have a particular orientation or be constructed and operated in a particular orientation and, therefore, should not be taken as limiting the present invention.

As used in this specification, the singular forms "a", "an" and "the" include plural referents, and the plural forms "a plurality" includes more than two referents unless the content clearly dictates otherwise. As used in this specification, the term "or" is generally employed in its sense including "and/or" unless the content clearly dictates otherwise, and the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either fixedly connected, detachably connected, or integrally connected. Either directly or indirectly through intervening media, either internally or in any other relationship.

Referring to fig. 1 and 2, an embodiment of the present invention provides a reciprocating mechanism, which is installed in a housing 1 of an electric tool, and includes a power source 2, and a transmission mechanism 3 and a balance block 5, which are arranged from bottom to top, wherein the transmission mechanism 3 is in transmission connection with the power source 2.

Referring to fig. 4, the driving mechanism 3 includes a driving wheel 31, a driving pin 32, a driving rod 33 and a counterweight 34, wherein the driving wheel 31 is located at a lower portion of the reciprocating mechanism, the driving pin 32 is disposed at an eccentric position of an upper portion of the driving wheel 31 and is connected to the counterweight 34, and the counterweight 34 is a fan-shaped counterweight 34. The transmission wheel 31 is a face gear and is engaged with a bevel gear of the power source 2 for transmission.

Referring to fig. 4, one end of the transmission rod 33 is rotatably connected to the transmission pin 32, and the other end is pivotally connected to the reciprocating rod 4, when the transmission wheel 31 rotates under the driving of the power source 2, the transmission pin 32 revolves around the central axis of the transmission wheel 31 and drives the transmission rod 33 to move, and meanwhile, the reciprocating rod 4 connected to the transmission rod 33 can only reciprocate in a first direction a perpendicular to the central axis of the transmission wheel 31 due to the limitation of the limiting member 11 in the housing 1, and at this time, the reciprocating rod 4 itself can generate two opposite-direction inertia moments to the transmission pin 32 at two limit points of the reciprocating motion; the balance weight 34 is driven by the driving pin 32 to rotate around the central axis of the driving wheel 31, and since the center of gravity of the balance weight 34 and the driving pin 32 are respectively located at two opposite sides of the central axis of the driving wheel 31, the centrifugal force generated in the first direction a when the center of gravity of the balance weight 34 rotates can be offset with the inertia moment, so as to weaken the vibration of the driving wheel 31 in the first direction a.

Referring to fig. 1 and 5, the balance weight 5 is disposed above the transmission mechanism 3 in parallel, one end of the transmission pin 32 extends into the guide slot 51 in the middle of the balance weight 5, the guide slot 51 extends along the first direction a, the length of the guide slot is greater than or equal to the length of the motion track of the transmission pin 32 in the first direction a, and the width of the guide slot is equal to or slightly greater than the diameter of the transmission pin 32, so that when the transmission pin 32 revolves around the central axis of the transmission wheel 31, the balance weight 5 is driven to move along the second direction B perpendicular to the first direction a, so as to counteract the inertia moment in the second direction B when the center of gravity of the balance weight 34 rotates.

Referring to fig. 6 and 7, a guide mechanism 6 is disposed above the transmission mechanism 3 along the moving direction of the balance weight 5, the guide mechanism 6 has a bottom plate 61 and two guide rails 62 symmetrically disposed along two sides of the bottom plate 61, two sides of the balance weight 5 are provided with limit blocks 52 corresponding to the guide rails 62, and the balance weight 5 is movably mounted in the guide mechanism 6 through the limit blocks 52 and driven by the transmission pin 32.

Referring to fig. 3, the end of the driving pin 32 located in the guide groove 51 is sleeved with a bearing 321, and the bearing 321 can change sliding friction into rolling friction when the driving pin 32 moves in the guide groove 51, so that friction between the driving pin 32 and the inner wall of the guide groove 51 is greatly reduced, and the service life of the driving pin 32 is prolonged.

In another embodiment of the present invention, a reciprocating saw having a reciprocating mechanism as described above is disclosed that vibrates less and has a longer life for internal structures than other prior art reciprocating saws.

While the utility model has been described with reference to specific embodiments, it will be understood by those skilled in the art that the utility model is not limited thereto, and may be embodied in other forms without departing from the spirit or essential characteristics thereof. Any modification which does not depart from the functional and structural principles of the present invention is intended to be included within the scope of the claims.

Claims (7)

1. A reciprocating mechanism is arranged in a shell of an electric tool, and is characterized by comprising:

a power source;

the transmission mechanism is in transmission connection with the power source and is provided with a transmission wheel, a transmission pin, a transmission rod and a balance weight, wherein the transmission pin is eccentrically arranged on the transmission wheel and is connected with the balance weight, and the gravity center of the balance weight and the transmission pin are respectively positioned on two opposite sides of the central axis of the transmission wheel; one end of the transmission rod is rotatably connected with the transmission pin, the other end of the transmission rod is pivoted with a reciprocating rod, and the reciprocating rod is configured to reciprocate towards a first direction perpendicular to the central axis of the transmission wheel under the driving of the power source;

the counterweight is configured to rotate around the central axis of the driving wheel under the driving of the driving pin, and the gravity center of the counterweight counteracts the inertia moment of the reciprocating rod on the driving mechanism in the first direction when rotating;

the reciprocating mechanism further comprises a balance weight arranged above the transmission mechanism, and the balance weight is configured to move along a second direction perpendicular to the first direction under the driving of the transmission pin so as to counteract the inertia moment on the transmission mechanism in the second direction when the gravity center of the balance weight rotates.

2. The reciprocator of claim 1, wherein: a guide mechanism is arranged above the transmission mechanism along the movement direction of the balance block, and the balance block is movably arranged in the guide mechanism.

3. The reciprocator of claim 2, wherein: the guide mechanism is provided with a bottom plate and two guide rails symmetrically arranged along two sides of the bottom plate, and two sides of the balance block are provided with limit blocks corresponding to the guide rails.

4. The reciprocator of claim 1, wherein: the middle part of the balance block is provided with a guide groove along a first direction, and the transmission pin penetrates through the guide groove to drive the balance block to move towards a second direction.

5. The reciprocator of claim 4, wherein: the end part of the driving pin, which is positioned in the guide groove, is sleeved with a bearing.

6. The reciprocator of claim 1, wherein: and a limiting part is arranged in the shell along a first direction so as to enable the reciprocating rod to reciprocate along the first direction.

7. A reciprocating saw, characterized in that: the reciprocating saw having a reciprocating mechanism as defined in claim 1.

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