KR20190055291A - Gear Box of Power Tool with Integral Type Collar - Google Patents

Abstract

The present invention relates to a gear box of a power tool with an integral collar, which has a plurality of support bumps integrally formed along a circumferential direction of the collar placed inside the gear box and to make an interrupting function of a motor conducted definitely. According to the present invention, the gear box of the power tool with the integral collar comprises: a gear box main frame (20) connected to a motor unit; a spindle (22) placed inside the gear box main frame (20) to be engaged with a tool unit and to transfer power; an internal gear (30) placed on an outer circumferential surface of the spindle (22) to transfer power; the collar (40) in charge of a clutch function; a plurality of elastic members (50) elastically supported by one surface of the collar (40) to control a torque; a holder (60) which comes in contact with and fixates the elastic member (50); and a torque nut (70) which controls an elastic force of the elastic member (50). The collar (40) has a plurality of support bumps (42) integrally formed to protrude along a circumferential direction at intervals on the surface opposite to the surface where the elastic member (50) is placed. One surface of the internal gear (30) has a plurality of bumps (32) formed along a circumferential direction at intervals to come in contact with the support bumps (42) of the collar (40).

Description

Technical Field [0001] The present invention relates to a gearbox of a power tool having an integral collar,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gear box of an electric tool having an integral collar, and more particularly, to a gear box having an integral collar, in which a plurality of support protrusions are integrally formed along a circumferential direction of a collar provided in a gear box, It is.

Generally, a power tool has a built-in motor driven by a power supply, and a driver or a drill is combined to perform an operation by a rotary operation according to driving of the motor. The impact tool among these power tools basically performs a drill operation And a clutch function that cuts off the driving force when a certain torque is exceeded in order to prevent damage to the bolt or the screw or overload of the power tool due to excessive torque applied to perform the screw tightening operation.

The gear box structure for a conventional power tool is basically composed of a ring gear that transmits the rotational force of the motor and a ring gear that transmits the rotational force of the ring gear intermittently and rotates Spindle.

In this conventional gearbox for a power tool, the torque transmission force is limited depending on the working load when transmitting the rotational force of the ring gear. The ring gear is followed by a ball, a collar and a spring. When the rotational force of the ring gear is smaller than the spring force The spindle is rotated by rotating all the structures after the collar, and when the rotational force of the ring gear is larger than the spring force, the rotational force is not transmitted to the spindle over the ball, In this case, since a plurality of balls are separately provided along the circumferential direction, the precision of the ball is reduced due to the clearance between the ball and the collar when the rotational force of the motor is transmitted, Therefore, there is a problem in that the torque torque can not be accurately controlled.

Japanese Patent No. 4597849 (Published on Dec. 15, 2010)

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide a motor for a motor, And to provide a gear box of a power tool having an integral collar.

According to an aspect of the present invention, there is provided a gear box comprising: a gear box body connected to a motor unit; A spindle coupled to the tool portion to transmit power to the gear box body; An internal gear provided on an outer peripheral surface of the spindle for transmitting power; A collar functioning as a clutch; A plurality of elastic members mounted on one side of the collar to control the torque; A holder for contacting and fixing the elastic member; And a torque nut for adjusting an elastic force of the elastic member,

Wherein the collar is formed by integrally protruding a plurality of support protrusions on an opposite surface of the collar in a circumferential direction on the opposite surface on which the elastic member is disposed, the one surface of the internal gear being spaced apart from the support protrusions A plurality of protrusions that contact each other are formed.

In addition, the plurality of elastic members are arranged in parallel to the opposite surface of the support protrusions of the collar.

The plurality of elastic members are all the same in height and include some elastic members having different elastic forces.

Further, the present invention is characterized in that a part of the plurality of elastic members has a different height and has the same elastic force.

As described above, according to the present invention, the support protrusions are integrally formed on one side of the collar in the gear box provided in the power tool so that the torque can be accurately transmitted without torque when the torque is transmitted by the motor.

Further, the present invention has the effect that a plurality of elastic members that are resiliently mounted on one surface of the collar are aligned in parallel with the support protrusions of the collar, and the collar can be pushed accurately when pushed by the internal gear.

In addition, the present invention has the effect of realizing various types of torque by including a part of elastic members having different elastic forces of a plurality of elastic members that are resiliently mounted on one surface of the collar.

1 is an exploded perspective view of a gear box mounted in a power tool according to an embodiment of the present invention.
2 is a cross-sectional view of the connection of Fig.
3 is a perspective view of a collar provided on a gear box mounted in a power tool according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

As used herein, terms used in the present specification are selected from the general terms that are currently widely used, while taking into consideration the functions, but these may vary depending on the intention or custom of the artisan or the emergence of new techniques. Also, in certain cases, there may be a term selected by the applicant at will, in which case the meaning will be described in the description part of the corresponding specification. Accordingly, it is intended that the terminology used herein should be interpreted relative to the actual meaning of the term rather than the nomenclature, and its scope throughout this specification.

1 is an exploded perspective view of a gear box mounted in a power tool according to an embodiment of the present invention.

1, a gear box 10 mounted in a power tool according to an embodiment of the present invention includes a gear box body 20 connected to a motor unit, An internal gear 30 provided on the outer circumferential surface of the spindle 22 to transmit power and a collar 40 functioning as a clutch, A plurality of elastic members 50 mounted on one surface of the collar 40 to control torque and a holder 60 fixed to the elastic member 50 while being in contact with the elastic member 50, An elastic member support holder 74, a torque handle holder 80 for fixing internal components of the gear box 10, and a fastening member 72 82).

One side of the internal gear 30 has a structure in which a plurality of protrusions 32 are formed at intervals along the circumferential direction.

The holder 60 has a structure in which a plurality of support members 62 are formed on one surface of the holder 60 so as to support the plurality of elastic members 50.

As shown in FIG. 3, the collar 40 includes a plurality of support protrusions 42 integrally protruding from the opposite surface on which the plurality of elastic members 50 are disposed, spaced along the circumferential direction Structure.

The support protrusions 42 formed integrally with the collar 40 are engaged with the protrusions 32 of the internal gear 30 when the internal gear 30 rotates, The protrusion 32 of the internal gear 30 moves over the support protrusion 42 of the collar 40 or the protrusion 32 of the internal gear 30 moves over the support protrusion 42 of the collar 40, I can not get over it, so I'm stuck.

The projections 32 of the internal gear 30 are formed in a trapezoidal shape.

The plurality of elastic members 50 may be arranged in the same manner as the number of the support protrusions 42 of the collar 40 and the support protrusions 42 of the collar 40 may be arranged in the same manner. As shown in FIG.

The plurality of elastic members 50 may be arranged as elastic members having the same elastic force, but some elastic members may be arranged with different elastic forces.

In other words, in the present embodiment, a total of six elastic members 50 are disposed in the elastic member 50, and the elastic forces of the two opposing elastic members 50 are the same as those of the remaining four elastic members 50 The elastic force can be made smaller than the elastic force.

The torque nut 70 has a thread 71 formed on its inner circumferential surface,

1, the gear box main body 20 has a structure in which a planetary gear 24 engaged with the inner peripheral surface of the internal gear 30 is formed.

2, the sun gear 26 is provided on the inner side of the planetary gear 24, and in this embodiment, the planetary gear 24 has three stages when power is transmitted by the motor unit . That is, when the sun gear 26 and the planetary gear 24 are one set, three sets may be provided. The operation of the sun gear 260 and the planetary gear 24 is well known in the art, and thus a detailed description thereof will be omitted.

The torque nut 70 has a screw thread 71 formed on the inner circumferential surface thereof, so that the elastic force of the elastic member 50 can be controlled according to the degree of further pressing to the right in Fig.

The gear box 10 according to an embodiment of the present invention is configured such that when a power is transmitted from the motor unit through the operation of a motor unit (not shown) coupled to the right side of the gear box 10 in FIG. 2, The internal gear 24 is rotated so that the internal gear 30 is forced to rotate so that the projection 32 of the internal gear 30 contacts the support protrusion 42 of the collar 40 A force for pushing in the axial direction acts.

At this time, when the rotation torque of the internal gear 30 is smaller than the elastic force of the elastic member 50, the elastic member 50 is mounted on the back surface of the collar 40, The internal gear 30 is stopped and the planetary gear 24 meshed with the inner circumferential surface of the internal gear 30 comes to a stop, The spindle 22 is rotated and the tool operation can be performed through the electric power tool.

On the other hand, when the rotation torque of the internal gear 30 is greater than the elastic force of the elastic member 50, the protrusion 32 of the internal gear 30 rides over the support protrusion 42 of the collar 40 The collar 40 acts on the collar 40 in the axial direction so that the collar 40 overcomes the elastic force of the elastic member 50 and contracts the elastic member 50 to move in the axial direction.

Therefore, the internal gear 30 rotates. At this time, the planetary gear 24, which is inscribed on the inner circumferential surface of the internal gear 30, is only rotated, idly revolving, ) Will not rotate.

Since the support protrusions 42 are integrally formed on one surface of the collar 40 so as to protrude integrally when performing the clutch function of the gear box 10, accurate operation is performed during operation with the internal gear 30, .

Also, according to an embodiment of the present invention, a plurality of elastic members 50 are provided, and a part of the elastic members 50 are formed of the elastic members 50 having different elastic forces, so that various torques can be realized.

For example, when the elastic members 50 having the same elasticity are all provided and the maximum torque of the elastic member 50 is formed larger than the designed value, the elastic members 50 may be replaced with small elastic members, Value can not be exceeded.

In other words, when the height (length) of the six elastic members 50 is 10, if the elastic forces are all the same, the elastic force is linearly changed from 1 to 10 upon pressing with the torque nut 70 do.

However, as in the present invention, there are four elastic members 50 having a height (length) of 10, an elastic force of 10, an elastic member 50 having a height (length) of 10, The elastic force is changed linearly from 1 to 8 when the torque nut 70 is pressed.

Of course, when the elastic force of the four elastic members 50 is 10 and the elastic force of the two elastic members 50 is 15 out of the elastic members 50 whose height is all the same as 10, when the torque nut 70 is pressed The elastic force can be changed linearly from 1 to 12.

When the number of elastic members 50 having a height of 10 and the number of elastic members 50 having a height of 5 are two and the elastic force is 10 at all, the torque nut 70 may be an elastic member having a height of 10 The elastic member 50 having a height of 5 is pressed, so that the elastic force is changed non-linearly.

The height (length) of the elastic member 50 is the same and the elastic force is different from that of the elastic member 50, so that the thickness of the wire forming the elastic member 50 can be made relatively small to reduce the elastic force.

In the above example, the unit of the height and the elastic force of the elastic member 50 is a relative value for explaining the arrangement condition of the elastic member 50 of the present invention, and will not be described for the sake of convenience.

Therefore, the height and elasticity of the plurality of elastic members 50 are partially different from each other, so that it is possible to provide an optimal major tool suited to the working conditions when using the power tool.

According to an embodiment of the present invention, since the collar 40 is formed so that the support protrusions 42 protrude integrally, when the gear box 10 is assembled, a plurality of balls The assembly can be made very easily.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, But fall within the scope of the appended claims.

10: Gearbox
20: Gear box body
22: Spindle
24: planetary gear
26: sun gear
30: internal gear
32: projection
40: collar
42: support projection
50: elastic member
60: Holder
62: Support member
70: Torque nut
71: Threaded
72: Packing
74: elastic member support holder
80: Torque handle holder
84: fastening member

Claims (4)

A gearbox main body 20 connected to the motor unit;
A spindle 22 provided inside the gear box body 20 and coupled with the tool portion to transmit power;
An internal gear (30) provided on the outer circumferential surface of the spindle (22) to transmit power;
A collar 40 for performing a clutch function;
A plurality of elastic members 50 elastically supported on one surface of the collar 40 to control torque;
A holder 60 for contacting and fixing the elastic member 50;
A torque nut 70 for adjusting an elastic force of the elastic member 50;
Lt; / RTI >
The collar 40 includes a plurality of support protrusions 42 protruding from the opposite surface of the collar 40 along the circumferential direction on which the elastic member 50 is disposed,
Wherein one surface of the internal gear (30) is formed with a plurality of protrusions (32) that are spaced apart from one another in the circumferential direction and contact with the support protrusions (42) of the collar (40) Gearbox of the tool.
The method of claim 1,
Characterized in that the plurality of elastic members (50) are mounted in parallel to the opposite surface of the support protrusion (42) of the collar (40).
The method according to claim 1,
Wherein the plurality of elastic members (50) are all the same in height and include some elastic members having different elastic forces.
The method according to claim 1,
Characterized in that the height of a part of the plurality of elastic members (50) is different and the elastic forces are all the same.

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