CN201175900Y - Power output device of electric tool - Google Patents

Abstract

The utility model provides a power output device of an electric tool, which comprises a seat body, a switching part, an impact mechanism, a pressing part, an output shaft and a knob shell; the base is driven by power to drive the output shaft, so as to drive the tool to rotate. The switching part is provided with a knob for switching segment speed to control the position of a positioning spring; the impact mechanism is provided with a directional wheel movably combined with the output shaft and a jumping wheel fixedly arranged in the output shaft, convex tooth surfaces which can be mutually meshed are respectively formed on the top end surface of the directional wheel and the bottom surface of the jumping wheel, an outer ring is arranged at the bottom of the directional wheel, and the degree of freedom of the outer ring relative to the rotation of the output shaft is determined by the change of the position of the positioning spring; when the directional wheel is engaged by the positioning spring, the degree of freedom of the directional wheel is limited, and then the ratchet mechanism of the directional wheel acts, otherwise, when the directional wheel is not engaged by the positioning spring, the directional wheel can freely rotate along with the output shaft.

Description

Electric Tool PTO

technical field

The utility model relates to a power output device of an electric tool, in particular to a structure which is smoother and easier to insert files when switching gear positions.

Background technique

In the prior art, electric tools with rotary output power and output impact force generally have a switching mechanism for switching the output power and form of multi-stage gears, and usually the last gear is to provide simultaneous rotary power output and The location of the impact force output, however, this type of power output device is composed of very complex components. Based on this, Taiwan Patent Publication No. 554808 aims to solve the problem that the structure of the aforementioned power output device is too complicated, so that the cost is relatively high. The structure of the device in said patent includes a base, a switching part, an impact mechanism, a pressing part, an output shaft, and a knob housing, wherein the switching part has a plurality of positioning pieces combined with a switching seat The impact mechanism has a directional wheel and a jumping wheel, wherein the directional wheel is movably combined with the output shaft, and the jumping wheel is fixed on the output shaft; the top surface of the directional wheel and the bottom surface of the jumping wheel respectively form a movable The convex tooth surfaces that mesh with each other; the aforementioned positioning piece has a corresponding positional relationship with the outer ring of the directional wheel, so rotating the knob can make the flange at the bottom of the knob press the positioning piece, and then the protrusion in the positioning piece The flange around the outer ring at the bottom of the directional wheel is clamped at the bottom of the directional wheel, causing the axial rotational freedom of the outer ring to be restricted; Therefore, when the two end surfaces move relative to each other, the jumping wheel will jump, and provide the output shaft to generate an axial intermittent impact force, thereby achieving the function of outputting impact power.

Utility model content

The purpose of this utility model is to solve Taiwan Patent No. 554808. When the knob is rotated to the file position of the output impact power function, the convex part in the positioning piece will be pressed against the flange in the directional wheel to interfere, causing the positioning piece to The position of the outer ring of the directional wheel cannot be inserted smoothly, resulting in the problem that the gear cannot be smoothly entered and the operation must be performed again, or even performed multiple times.

Based on the above purpose, the utility model provides a power output device of an electric tool, which includes a base, a switching part, an impact mechanism, a pressing part, an output shaft, and a knob housing; the base is driven by power The output shaft is driven to drive the tool to rotate to perform processing operations such as screw locking, drilling or impacting. The switching part has a knob for switching speeds that can control the position of a positioning spring; the impact mechanism has a directional wheel that is movably combined with the output shaft and a jumping wheel that is fixed in the output shaft. The top surface and the bottom surface of the jumping wheel respectively form convex tooth surfaces that can mesh with each other. An outer ring is installed at the bottom of the directional wheel, and the outer ring will be determined by the change of the position of the positioning spring relative to the output shaft. Degree of freedom, when the directional wheel is bitten by the locating spring, the degree of freedom of the directional wheel is limited, and then the ratchet mechanism of the directional wheel is activated; otherwise, when the directional wheel is not bitten by the locating spring, the directional wheel can follow the The output shaft rotates freely. Therefore, when the knob is turned to the impact gear, it can provide tool end rotation power and perform impact processing when the output shaft rotates.

The utility model adopts a positioning spring to replace the aforementioned positioning piece, and the outer ring of the aforementioned directional wheel is made into a wave shape. When the knob is turned to the file position of the non-output impact power function, the positioning spring can be positioned in the knob. Inside, and corresponding to the wavy trough of the directional wheel, in this state, because the positioning spring has flexibility and elasticity, the degree of freedom of the directional wheel when it rotates relative to the output shaft is not affected, so it can rotate and output power. When the knob is turned to the file position of the output impact power function, because the structure inside the knob squeezes the positioning spring toward the direction of the directional wheel, the positioning spring is inserted into the wavy trough of the directional wheel. In this state, the directional wheel The degree of freedom of rotation is limited, and then the ratchet mechanism of the directional wheel is activated, so that it can be ensured that the gear can be smoothly entered every time the gear is switched.

Compared with the prior art, the power output device of the electric tool of the utility model can ensure that the gears can be shifted smoothly every time the gears are switched, so that the user can operate the shifting gears more smoothly and conveniently.

Description of drawings

Fig. 1 is a three-dimensional exploded view of the power output device of the electric tool of the present invention;

Fig. 2 is a sectional view of the seat in the power output device of the utility model electric tool;

Fig. 3 is a side sectional view of the meshing surface of the directional wheel and the jumping wheel in the power output device of the electric tool of the present invention;

Fig. 4 is a plane sectional view in which the positioning spring of the present invention is not embedded in the trough of the directional wheel, so that the rotational freedom of the directional wheel relative to the output shaft is not restricted;

Fig. 5 is a plane sectional view in which the positioning spring of the present invention has been embedded in the trough of the directional wheel, so that the rotational freedom of the directional wheel relative to the output shaft is restricted.

In the figure,

1 seat body 11 input wheel set

2 switching part 20 chassis

21 switch seat 21a slotting

21b external thread 22 positioning spring

24 knob 24a internal thread

24b flange 25 spring

3 impact mechanism 31 directional wheel

31a convex tooth surface 31b ratchet part

31c outer ring 31d trough

32 jumping wheel 32a convex tooth surface

33 bushing ring 4 pressing part

41 Elastic gasket 42 Gasket ring

5 output shaft 5a protruding ring

6 knob housing 6a perforated

Detailed ways

The implementation of the present utility model will be described in more detail below in conjunction with the accompanying drawings and component symbols, so that those familiar with this field can implement it after studying this specification.

Please refer to Figure 1 and Figure 2, which are preferred embodiments of the power output device of the utility model electric tool, which mainly includes a base 1, a switching part 2, an impact mechanism 3, a pressing part 4, and an output shaft 5 and a knob housing 6.

Wherein, the main body of the base body 1 is a driving device, one end of which forms an end surface structure that can be fitted and fixedly connected to the bottom end of the switching part 2, and the end surface structure has an input wheel set 11 extending out of the driving device.

The switching part 2 includes a hollow cylindrical switching seat 21 extending inside a chassis 20 , and is fixedly connected to the aforementioned seat body 1 through the bottom end of the chassis 20 . The switching seat 21 has several through grooves 21a extending upward from the bottom and penetrating through the sidewall, and an external thread 21b surrounding the top of the switching seat. A positioning spring 22 is respectively embedded in each through slot 21a. In the embodiment of the present utility model, the positioning spring 22 is a compression spring with elasticity and flexibility. The thread 21b is combined with a ring-shaped knob 24. The inner ring surface of the knob has an internal thread 24a that matches the external thread 21b at the top of the switching seat 21, and several protrusions that protrude from the bottom and match the position of the positioning spring 22. flange 24b. Before the knob 24 is combined with the switch seat 21, a spring 25 is inserted into the switch seat 21, so that after the knob 24 is combined with the switch seat 21, the two ends of the spring 25 are pressed against the top surface of the chassis 20 of the switch part 2 and the between the bottom surfaces of the knob 24 to provide proper elastic force of the knob 24 .

The impact mechanism 3 includes several annular bodies such as a directional wheel 31 , a jumping wheel 32 and a lining ring 33 . The top surface and the bottom of the directional wheel 31 respectively form a convex tooth surface 31a and a ratchet part 31b. 5. An outer ring 31c that rotates. The outer diameter surface of the outer ring 31c is wave-shaped and has a plurality of arc-shaped crests and troughs 31d. One end of the jumping wheel 32 has a convex tooth surface 32a that can mesh with the convex tooth surface 31a of the directional wheel 31, and the two groups of convex tooth surfaces 31a and 32a are respectively complementary inclined teeth (as shown in Figure 3 ) , so that when the two convex tooth surfaces 31a and 32a rotate relative to each other in the meshing state, the jumping wheel 32 will produce a jumping effect.

The pressing portion 4 is composed of a pre-bent elastic washer 41 and a backing ring 42 .

The output shaft 5 is a long column and forms a protruding ring 5a. One end of the output shaft 5 passes through the pressing part 4, the impact mechanism 3 and the switching part 2 in sequence, and then connects to the seat body 1. The input wheel set 11 makes the output shaft 5 rotate under the drive of the input wheel set 11, and the other end of the output shaft 5 forms an end surface structure that can be equipped with various processing tools; in addition, the jumping wheel 32 is fixed on the on output shaft 5.

The knob housing 6 has a through hole 6a in the center, and a cylindrical hollow body with an opening at one end. The axial position is limited by the interference of the protruding ring 5a, and the knob 24 can be driven to rotate by rotating the knob housing 6 .

The above-mentioned switching part 2 is a mechanism that can switch the speed file position by driving the knob 24 to rotate through the knob housing 6 . When the position of the knob 24 after turning is at the position of the speed file position other than the last file position, the output shaft 5 will be subjected to the outward force of the elastic washer 41 in the pressing part 4, and the knob 24 The flange 24b in the center will not press the positioning spring 22. Meanwhile, the positioning spring 22 is located inside the knob 24 and corresponds to the wavy trough 31d of the directional wheel 31 (as shown in FIG. 4 ), where In this state, since the positioning spring 22 has flexibility and elasticity, when the orientation wheel 31 rotates relative to the output shaft 5, the arc-shaped crest of the outer ring 31c can still pass through the positioning spring 22, so that the degree of freedom of rotation of the orientation wheel 31 is not limited. Affect, so it can rotate the output power. In other words, during the drilling operation, when the end surface of the output shaft 5 on which the tool is installed is subjected to a pressing force, although the protruding ring 5a of the output shaft 5 will generate an axial force to act on the elastic washer 41 of the pressing part 4 And drive jumping wheel 32 to shrink back and mesh with the convex tooth surface 31a of this directional wheel 31, but be located at the outer ring 31c of directional wheel 31 can rotate freely on the output shaft, therefore, this jumping wheel 32 and directional wheel 31 meet Keep the meshing state without jumping off the meshing surface.

As shown in Figure 5 again, when the knob 24 is rotated to the file position of the output impact power function, the internal thread 24a of the knob 24 will squeeze the positioning spring 22 towards the direction of the orientation wheel 31, so that the positioning spring 22 is inserted into the orientation wheel 31 in the trough 31d; in this state, the degree of freedom of rotation of the directional wheel 31 is restricted and cannot rotate freely relative to the output shaft 5, and then the ratchet mechanism 31b of the directional wheel 31 is activated, so it can be ensured in each gear shift It can enter the file smoothly at any time. In other words, during the impact operation, when the end surface of the output shaft 5 installed with the tool is subjected to a pressing force, the protruding ring 5a of the output shaft 5 will generate an axial force to act on the elastic washer 41 of the pressing part 4 and Drive the beating wheel 32 to retreat backward and mesh with the convex tooth surface 31a of the directional wheel 31, and the directional wheel 31 will be affected by the fixed ratchet part 31b of the outer ring 31c and cannot rotate, so the beating wheel 32 is meshed with the directional wheel 31 The two end faces will move relative to each other, so that the protruding teeth on the two end faces will jump away, so the output shaft 5 can be driven to generate an axially outward intermittent impact force to achieve the function of impacting the file.

The above descriptions are only preferred embodiments for explaining the utility model, and are not intended to limit the utility model in any form. Therefore, any relevant modifications or changes made under the same spirit should be Included in the category that the utility model intends to protect.

Claims (2)

1. A power output device for an electric tool, comprising a base, a switching part, an impact mechanism, a pressing part, an output shaft, and a knob housing, the base is driven by power to drive the output shaft to rotate ; The switching part further includes a switching seat, and a knob locked on the switching seat. The switching seat is provided with a plurality of through grooves, and the bottom end of the knob has a flange; the impact mechanism has a movable combination with the output shaft. A directional wheel and a jumping wheel fixed in the output shaft, the top surface of the directional wheel and the bottom surface of the hopping wheel respectively form convex tooth surfaces that can mesh with each other, an outer ring is installed at the bottom of the directional wheel, and There is a rotating ratchet mechanism characterized by: Positioning springs are respectively placed in the plurality of slots of the switching seat, and the positioning springs enter the inside of the knob; the outer diameter of the outer ring is formed in a wave shape with a plurality of arc-shaped peaks and troughs, When the knob is rotated to the non-impact position, the positioning spring is located inside the knob and not embedded in the trough of the outer ring, so that the rotational freedom of the directional wheel relative to the output shaft is not restricted; when the knob When it is rotated to the impact gear position, the positioning spring is pushed by the knob and embedded in the trough of the outer ring, so that the rotational freedom of the directional wheel relative to the output shaft is restricted, so that the jumping wheel and the When the directional wheel generates relative rotational movement, the jumping wheel generates a jump and provides the output shaft to generate an axial intermittent impact force. 2. The electric tool power output device according to claim 1, characterized in that: The positioning spring is a compression spring.

Images