CN211072039U - Reciprocating type power tool - Google Patents

Abstract

The utility model provides a pair of reciprocating type power tool, including motor, motor shaft tooth and fixing support, still include first location axle and second location axle, wherein, the epaxial first gear that has first and second balancing weight of being equipped with of first location and the second gear that has the third balancing weight, and the rotation of first gear and second gear is opposite, the epaxial third gear with second gear complex that is equipped with of second location. The utility model provides a pair of reciprocating type power tool, not only the structure is compacter light and handy, can also effectively reduce vibration and impact, has improved operator's use comfort and the life of mechanism.

Description

Reciprocating type power tool

Technical Field

The utility model relates to an electric tool technical field, especially a reciprocating type power tool.

Background

Reciprocating-type motion mechanisms find application in many mechanical products, such as reciprocating saws. In the machines, the reciprocating motion of a working mechanism can generate larger inertia force, and if the inertia force cannot be effectively eliminated in the operation of the mechanism, the whole mechanism generates an unbalanced force, so that vibration and impact are brought to the machine, and the use comfort of an operator and the service life of the mechanism are seriously influenced.

At present, in general reciprocating motion products, structures generating opposite inertia forces are designed in the reciprocating direction of a mechanism, so that unbalance generated by the inertia forces is weakened to a certain extent, but the structures generate new inertia forces in other directions to bring new unbalance forces, and great influence also exists.

Disclosure of Invention

The utility model provides a reciprocating type power tool can effectively reduce vibration and impact, has improved operator's use comfort and the life of mechanism.

In order to achieve the above object, according to an aspect of the present invention, there is provided a transmission device of a hand-held power tool, a reciprocating power tool, comprising a motor, a motor shaft tooth connected to an output end of the motor, and a fixed support, wherein the fixed support is provided with a first positioning shaft parallel to the motor shaft tooth, the first positioning shaft is provided with a first gear engaged with the motor shaft tooth and a second gear rotating in a direction opposite to the first gear, an upper end surface and a lower end surface of the first gear are respectively and fixedly provided with a second weight block and a first weight block, and the second gear is fixedly provided with a third weight block at a lower end surface close to the first gear; a second positioning shaft parallel to the motor shaft teeth is arranged on the fixed support, a third gear matched with the motor shaft teeth is arranged on the second positioning shaft, and the third gear is matched with the second gear and drives the second gear to rotate; an eccentric wheel is arranged on the upper end face of the second gear, a pin shaft is fixed on the eccentric wheel and connected with a reciprocating rod, and the second gear drives the reciprocating rod to reciprocate in a rotating mode.

The utility model discloses the further scheme of creation, the second balancing weight with first balancing weight is fixed on the same position of the axial projection of first gear.

The utility model discloses the further scheme of creation, first gear is being close to fixing support's one end is equipped with first boss, the height of first boss with the height of first balancing weight is the same.

The utility model discloses the further scheme of creation, the second gear is being close to the one end of first gear is equipped with the second boss, the second boss highly with the second balancing weight with the high sum of third balancing weight is the same.

The utility model discloses the further scheme of creation, the second location axle is close to the reciprocating lever keeps away from the one end of output.

The utility model discloses the further scheme of creation, first gear with the third gear is located respectively the both sides of motor shaft tooth, just the motor shaft tooth be close to motor body the lower extreme with first gear engagement, the upper end of motor shaft tooth with third gear engagement.

The utility model discloses the further scheme of creation, the terminal department of reciprocating lever is equipped with the guide rail, the fixed bearing that is equipped with of lower extreme that is close to the motor on the guide rail, the bearing supports presses on the eccentric wheel, wherein the eccentric wheel with the fitting surface of bearing is the inclined plane.

The utility model discloses the further scheme of creation, the upper end of keeping away from the motor on the guide rail still is equipped with the spring, the other end of spring supports and leans on reciprocating type power tool's casing.

The utility model discloses a technical scheme, following beneficial effect has:

1. the utility model discloses change traditional design, set up the balancing weight respectively at the upper and lower terminal surface of first gear, can avoid motor gear shaft overlength for this reciprocating type power tool structure is compacter lighter and more handy.

2. The inertial force generated by the counter weight blocks in the motion process can be mutually offset or weakened with the inertial force generated by the weight of the reciprocating rod in the reciprocating motion direction, and the inertial forces generated by the counter weight blocks on the two gears in other directions can be mutually offset, so that the resultant force of the inertia generated by the whole mechanism in each direction is zero or smaller, and the vibration and the impact are reduced.

3. The utility model discloses a gear is equipped with the boss and can cooperates with the balancing weight, and both have the same height, has also practiced thrift the cost when being convenient for processing production.

4. The utility model discloses an eccentric wheel terminal surface outer ring design is the inclined plane, and this inclined plane and the contact of antifriction bearing outer lane along with gear revolve, under the effect of spring, the guide rail will carry out vertical up-and-down motion, drives the up-and-down motion of reciprocating lever end portion, can realize effectual cutting.

Drawings

The present invention will be further described with reference to the accompanying drawings.

Figure 1 is a cross-sectional view of a reciprocating power tool of the present invention.

Fig. 2 is a partial exploded view of a reciprocating power tool according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to 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 invention. Words such as "upper," "lower," "front," "rear," and the like, which indicate orientation or positional relationships, are used solely to facilitate the description of the invention and to simplify the 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 construed as limiting the invention.

Referring to fig. 1 to 2, a reciprocating power tool includes a motor 1 and motor shaft teeth 18 connected to an output end of the motor. The output end of the motor 1 is fixedly provided with a fixed support 2, the fixed support 2 is provided with a first positioning shaft 19 and a second positioning shaft 20 which are axially parallel to the motor shaft teeth 18, the first positioning shaft 19 is provided with a first gear 3 matched with the motor shaft teeth 18 and a second gear 4 which is opposite to the first gear 3 in rotation direction, the first gear is preferably right-handed, the second gear is left-handed, and other gear designs can be adopted by technical personnel in the field.

The first gear wheel 3 is provided with a first cam 21 at an end adjacent to the fixed support 2, which is coaxial with the first gear wheel 3 and extends cylindrically outwards. A first balancing weight 17 is arranged between the outer contour edge of the first boss 21 and the outer contour edge of the first gear 3, the first balancing weight 17 is fixedly connected to the first gear 3, and the axial length of the first balancing weight 17 is equal to the axial length of the first boss 21. The first gear 3 is provided with a second weight block 16 on the upper end face far away from the motor 1, and the second weight block 16 and the first weight block 17 are fixed on the same position of the first gear 3, namely the second weight block 16 and the first weight block 17 are overlapped in the axial projection.

The second gear 4 is provided with a second boss 22 at an end close to the first gear 3, and the second boss is coaxial with the second gear 4 and extends in a cylindrical shape towards the first gear 3. A third balancing weight 14 is arranged between the outer contour edge of the second boss 22 and the outer contour edge of the second gear 4, the third balancing weight 14 is fixedly connected to the second gear 4, and the axial length of the third balancing weight 14 is equal to the sum of the heights of the second balancing weight 16 and the third balancing weight 14.

A second positioning shaft 20 is located near the end of the reciprocating lever 6 remote from the output end. The second positioning shaft 20 is provided with a third gear 15, the third gear 15 and the first gear 3 are respectively positioned at two sides of the motor shaft tooth 18, wherein the lower end of the motor shaft tooth 18 close to the motor 1 body is meshed with the first gear 3, and the upper end of the motor shaft tooth 18 is meshed with the third gear 15. The third gear 15 also cooperates with the second gear 4 and drives the second gear 4 in rotation.

An eccentric wheel 5 is arranged on the upper end face of the second gear 4, a pin shaft 8 is fixed on the eccentric wheel 5, the pin shaft 8 is connected with a reciprocating rod 6, and the second gear 4 drives the reciprocating rod 6 to reciprocate in a rotating mode.

The reciprocating rod 6 is supported by two guide rails, wherein a spring 12 is arranged at the upper end, far away from the motor 1, of the guide rail 7 arranged at the tail end of the reciprocating rod 6, and a bearing 11 is arranged at the lower end, close to the motor 1, of the guide rail 7. One end of the spring 12 abuts against the guide rail 7 and the other end abuts against the housing of the reciprocating power tool. The bearing 11 is fixed on the guide rail 7 through the rod 10, the other side of the bearing is pressed against the eccentric wheel 5, and the matching surface of the eccentric wheel 5 and the bearing 11 is an inclined surface, so that along with the rotation of the second gear 4, under the action of the spring 12, the guide rail 7 vertically moves up and down to drive the end part of the reciprocating rod 6 to swing up and down.

As the motor shaft teeth 18 rotate, the first gear 3 and the third gear 15 are driven to rotate in the same direction, while the third gear 15 drives the second gear 4 to rotate in the opposite direction to the first gear 3. The second gear 4 rotates to drive the eccentric wheel 5 to rotate, a pin shaft 8 on the eccentric wheel 5 is sleeved with a rolling bearing, the bearing is placed in a guide wheel groove, the guide wheel groove is fixedly connected to the reciprocating rod 6, and the guide wheel groove and the reciprocating rod 6 are driven to reciprocate together through the bearing when the second gear 4 moves circumferentially. The first gear and the second gear are both provided with balancing weights, and the balancing weights move along with the gears, the inertia force generated by the balancing weights when the balancing weights move can be mutually offset or weakened with the inertia force generated by the weight of the reciprocating rod in the reciprocating direction, and the inertia forces generated by the balancing weights on the two gears in other directions can be mutually offset, so that the resultant force of inertia generated by the whole mechanism in each direction is zero or smaller, and the vibration and the impact are reduced.

The utility model adopts the technical scheme that the upper end surface and the lower end surface of the first gear are respectively provided with the balancing weight, so that the overlong gear shaft of the motor can be avoided, and the reciprocating power tool has more compact and lighter structure; the gear provided with the boss can be matched with the balancing weight, and the gear and the balancing weight have the same height, so that the gear is convenient to process and produce, and the cost is saved; the utility model discloses an eccentric wheel terminal surface outer ring design is the inclined plane, and this inclined plane and the contact of antifriction bearing outer lane along with gear revolve, under the effect of spring, the guide rail will carry out vertical up-and-down motion, drives the up-and-down motion of reciprocating lever end portion, can realize effectual cutting.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and those skilled in the art should understand that the present invention includes but is not limited to the contents described in the above specific embodiments. 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 (8)

1. The utility model provides a reciprocating type power tool, includes the motor and connects motor shaft tooth and fixing support on the motor output, its characterized in that: a first positioning shaft parallel to the motor shaft teeth is arranged on the fixed support, a first gear matched with the motor shaft teeth and a second gear opposite to the rotation direction of the first gear are arranged on the first positioning shaft, a second balancing weight and a first balancing weight are respectively and fixedly arranged on the upper end surface and the lower end surface of the first gear, and a third balancing weight is fixedly arranged on the lower end surface, close to the first gear, of the second gear; a second positioning shaft parallel to the motor shaft teeth is arranged on the fixed support, a third gear matched with the motor shaft teeth is arranged on the second positioning shaft, and the third gear is matched with the second gear and drives the second gear to rotate; an eccentric wheel is arranged on the upper end face of the second gear, a pin shaft is fixed on the eccentric wheel and connected with a reciprocating rod, and the second gear drives the reciprocating rod to reciprocate in a rotating mode.

2. A reciprocating power tool as claimed in claim 1, wherein: the second balancing weight and the first balancing weight are fixed at the same position of the axial projection of the first gear.

3. A reciprocating power tool as claimed in claim 2, wherein: the first gear is provided with a first boss at one end close to the fixed support, and the height of the first boss is the same as that of the first balancing weight.

4. A reciprocating power tool as claimed in claim 3, wherein: and a second boss is arranged at one end of the second gear, which is close to the first gear, and the height of the second boss is the same as the sum of the heights of the second counterweight block and the third counterweight block.

5. A reciprocating power tool as claimed in claim 1, wherein: the second positioning shaft is close to one end, far away from the output end, of the reciprocating rod.

6. The reciprocating power tool of claim 5, wherein: the first gear and the third gear are respectively positioned on two sides of the motor shaft tooth, the lower end of the motor shaft tooth close to the motor body is meshed with the first gear, and the upper end of the motor shaft tooth is meshed with the third gear.

7. A reciprocating power tool as claimed in claim 1, wherein: the end of the reciprocating rod is provided with a guide rail, the lower end of the guide rail close to the motor is fixedly provided with a bearing, the bearing is pressed against the eccentric wheel, and the matching surface of the eccentric wheel and the bearing is an inclined surface.

8. A reciprocating power tool as claimed in claim 7, wherein: and a spring is further arranged at the upper end of the guide rail, which is far away from the motor, and the other end of the spring is abutted against the shell of the reciprocating power tool.

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