TWM464280U - Torque adjusting structure of electric screwdriver - Google Patents

Description

Torque adjustment structure of electric screwdriver (2)

This creation is about a torsion adjustment structure, especially a torsion adjustment structure of an electric screwdriver.

Regarding the electric screwdriver, the electric motor drives the linkage mechanism to rotate, and the transmission shaft in the linkage mechanism uses the driver seat to position each type of screwdriver head (for example, a word or a cross, etc.), so that the screwdriver head follows the transmission shaft. Rotate to achieve the purpose of tightening or loosening the screw.

When an electric screwdriver is used to tighten a screw, the electric screwdriver must be disengaged from the clutch with the electric motor by the clutch group in the linkage mechanism, otherwise the screw, the screwdriver or the electric screwdriver itself may be damaged; If you jump off early, you can't screw the screws.

Such automatic tripping is achieved by a coil spring in the electric screwdriver. When jumping, the coil spring in the electric screwdriver must be compressed before it can be tripped. In other words, if the coil spring has a small compressive elasticity, for example, For a coil spring with a small spring wire diameter, the tightening force must be small, which is usually suitable for small screws. Conversely, if the coil spring has a large compressive elasticity, for example, a coil spring with a large spring diameter. The tightening force that must be achieved is also large, and is usually applied to large screws. Therefore, if the compression spring force of the coil spring can be adjusted, the torque of the electric screwdriver can be controlled to respond to different screws.

However, the torque adjustment method of the conventional electric screwdriver is extremely troublesome, inconvenient and inaccurate, and often cannot be precisely adjusted to the required torque, and the position to be adjusted is often loosened, and even when adjusting, there is no clear feeling. The situation that often leads to over-adjustment has long been a problem for people.

Therefore, how to design a novel that can improve the above-mentioned conventional knowledge is a major topic that the creators of this case want to solve.

The purpose of the present invention is to provide a torque adjustment structure for an electric screwdriver, which is mainly provided with a plurality of grooves in the axial direction of the inner wall of the cylinder, and the adjustment module screwed to the outside of the cylinder is selectively elastically locked The positioning component in at least one of the grooves, together with the related structural design, has the following functions: precise adjustment of the required torque, prevention of the adjusted position of the adjustment module, and adjustment of the torque Have a clear sense of passage.

In order to achieve the above object, the present invention provides a torque adjustment structure for an electric screwdriver, the electric screwdriver having a transmission shaft, the torque adjustment structure comprising: a cylinder disposed outside the transmission shaft and provided with an external thread segment The inner wall of the cylinder is axially provided with a plurality of grooves arranged at intervals; an adjusting module includes an adjusting nut and an inner cylinder that is inserted into the adjusting nut and rotates together with the adjusting nut. The adjusting nut is provided with an internal threaded section screwed to the externally threaded section, the inner cylinder is sleeved on the transmission shaft and is provided with at least one positioning component, and the positioning component is selectively elastically clamped to either And a resilient component disposed on the drive shaft, and one end of the elastic component is elastically abutted against one end of the inner cylinder.

Compared with the prior art, the creation has the following functions: the precise adjustment of the required torque, the adjustment of the adjusted position of the adjustment module, and the clear sense of the passage when the torque adjustment is performed.

1‧‧‧ Ontology

11‧‧‧ linkage agency

12‧‧‧Drive shaft

121‧‧‧ Positioning Department

122‧‧‧Second buckle

2‧‧‧Cylinder

21‧‧‧ external thread section

22‧‧‧ trench

23‧‧‧ scale

R‧‧‧ adjustment module

3‧‧‧Inner tube

301‧‧‧ inner end

302‧‧‧Outside

31‧‧‧Positioning holes

32‧‧‧ Positioning components

33‧‧‧C-shaped retaining ring

331‧‧‧stop hole

34‧‧‧C-shaped covering ring

341‧‧‧Restricted holes

35‧‧‧ concave edge

351‧‧‧corresponding to the concave and convex

36‧‧‧First buckle

4‧‧‧Adjusting nut

41‧‧‧Opening

42‧‧‧Threaded section

43‧‧‧

5‧‧‧ collar

6‧‧‧ release spring

7‧‧‧Sleeve

8‧‧‧Flexible components

81‧‧‧ bushing

82‧‧‧First coil spring

83‧‧‧ spacer

84‧‧‧Second coil spring

The first picture is a perspective view of the first half of the electric screwdriver.

The second figure is an exploded perspective view of the first half of the electric screwdriver.

The third figure is a cross-sectional view of the first half of the creation of the electric screwdriver.

The third A picture is a cross-sectional view of the A-A according to the third figure.

The third B-picture is a cross-sectional view of the creation on the way to adjust the torque.

The fourth figure is a cross-sectional view of another embodiment of the creation.

In order to further understand the features, features and technical contents of the present invention, please refer to the following detailed description of the present invention and the accompanying drawings, which are only for reference and description, and are not intended to limit the present invention.

The present invention provides a torque adjustment structure for an electric screwdriver. As shown in the first to third figures, the electric screwdriver has a body 1. The body 1 is provided with a linkage mechanism 11, and the linkage mechanism 11 is coupled with a transmission shaft 12 and a transmission shaft. 12 has a positioning portion 121, and the original torque adjustment structure comprises: a cylinder 2, an adjustment module R and an elastic component 8. It should be noted that only the first half of the electric screwdriver is drawn in each drawing of the present invention, that is, the body 1 in each figure is in an unillustrated state in which the second half is omitted, and the second half of the electric screwdriver includes an electric motor and a manual push switch. (not shown in the figure), etc.

The cylinder 2 is connected to one end of the body 1 and sleeved outside the transmission shaft 12. The outer wall of the cylinder 2 is provided with an externally threaded section 21 and a plurality of scales 23. The inner wall of the cylinder 2 is axially spaced apart. Most of the channels 22 can be four (not shown), six (as shown in Figure 3A), 12 (as shown in Figure 4) or above.

The adjusting module R is configured to rotate and adjust the torque of the electric screwdriver, and comprises: an inner cylinder 3 and an adjusting nut 4, preferably further comprising a ring 5, a release spring 6 and a sliding sleeve 7.

The adjusting nut 4 defines an opening 41 and an internal thread segment 42 corresponding to the external thread segment 21, as shown in the second figure, within the adjusting nut 4 (ie, the inner edge corresponding to the position of the opening 41) The tether is provided with a concavo-convex portion (see Fig. 2) 43 composed of a continuous concavo-convex structure.

The inner cylinder 3 is provided with a concave edge (see the third figure) 35 and has a first buckle (see second and third figures) 36. The inner cylinder 3 is inserted into the inner side of the adjusting nut 4, and the outer end 302 of the inner cylinder 3 is passed out from the opening 41. The opening 41 of the adjusting nut 4 is correspondingly engaged with the concave edge 35 and the first buckle 36. The axial interference with each other causes the adjustment nut 4 and the inner cylinder 3 to be axially disengaged from each other. A concave edge (see the third figure) 35 outside the inner cylinder 3 is further provided with a corresponding concave and convex portion (see the second drawing) 351 corresponding to the concave and convex portion 43 so that the inner cylinder 3 follows the adjusting nut 4 Rotating together, in other words, when the torque adjustment is performed, the adjustment nut 4 will drive the inner cylinder 3 to rotate synchronously. The transmission shaft 12 is disposed inside the inner cylinder 3 and passes through the opening 41 together with the outer end 302 of the inner cylinder 3 .

In addition, the inner cylinder 3 is further provided with at least one positioning element 32 such that the positioning element 32 can be selectively elastically locked in any of the grooves 22. The positioning member 32 can be a steel ball as shown in the figure, and the positioning member 32 is received in the positioning hole 31 of the inner cylinder 3, and is covered by a C-shaped retaining ring (see FIG. 3A) 33 and a C-shaped shape. The ring 34 confines the positioning element 32.

In the embodiment, the inner cylinder 3 is provided with two positioning holes 31 and respectively accommodates two positioning elements 32, so that the two positioning elements 32 can be selectively elastically clamped in any two grooves 22 respectively. The C-shaped retaining ring (see FIG. 3A) 33 and the C-shaped covering ring 34 respectively surround the inner and outer edges of the inner cylinder 3 corresponding to the position of the positioning hole 31, and the C-shaped covering ring 34 is further provided with two The limiting hole 341 and the second limiting hole 341 respectively correspond to the foregoing two positioning elements 32. As shown in the figure, the two positioning elements 32 are respectively located between the two limiting holes 341 and the C-shaped blocking ring 33 of the C-shaped covering ring 34, so as to position the two. The element 32 can be elastically blocked in the positioning hole 31 by the external force due to the elastic stop of the C-shaped retaining ring 33, and the positioning member 32 can be prevented from coming out due to the restriction hole 341. Preferably, the C-shaped retaining ring 33 can also be provided with two stop holes (see FIG. 3A) 331 corresponding to the two positioning elements 32 respectively, so that each positioning element 32 can be correspondingly positioned in each stop hole. 331 is between each of the restriction holes 341.

Furthermore, the adjustment module R further includes a set of rings 5, a release spring 6 and a sliding sleeve 7. The collar 5 is sleeved on the transmission shaft 12 and can only move toward the free end of the transmission shaft 12. The sliding sleeve 7 is sleeved on the transmission shaft 12 and can only move in a direction opposite to the free end of the transmission shaft 12, releasing the spring. 6 is sleeved on the transmission shaft 12 and elastically supported between the collar 5 and the sliding sleeve 7. Wherein, the transmission shaft 12 has a flange (not shown), and a second buckle 122 is fastened near the free end of the transmission shaft 12 to respectively enable the collar 5 to only face the free end of the transmission shaft 12. The direction moves and the sleeve 7 cannot escape from the free end of the drive shaft 12. The collar 5 is adjacent to the outer edge of the transmission shaft 12 and the inner edge of the inner cylinder 3, and the collar 5 is also sleeved at a position near the free end of the transmission shaft 12 to ensure stable rotation of the transmission shaft 12. Deviated.

The elastic component 8 is sleeved on the transmission shaft 12 and elastically supported between the positioning portion 121 of the transmission shaft 12 and the inner end 301 of the inner cylinder 3.

In the present embodiment, the elastic component 8 includes a bushing 81 that is sleeved on the transmission shaft 12, a first coil spring 82 that is sleeved on the bushing 81, and a spacer that is sleeved on the bushing 81. 83 and a second coil spring 84 disposed on the transmission shaft 12, the first coil spring 82 is elastically supported between the bushing 81 and one side of the spacer 83, and the second coil spring 84 is elastically supported on the spacer 83. The other side is between the inner end 301 of the inner cylinder 3. Here, as shown in the third figure, the inner and outer rings (not shown) of the spacer 83 further have a ball assembly (not shown) arranged in a ring shape.

When the torque of the electric screwdriver is to be adjusted, the inner thread segment 42 is screwed on the outer thread segment 21 of the cylinder 2 by rotating the adjusting nut 4, in particular, the adjusting nut 4 is moved toward the linkage mechanism (see 3)) 11-direction screwing (ie, tightening adjustment module R), which can elastically compress the first and second coil springs 82, 84 to complete the adjustment of the torsion force; the adjustment nut 4 is opposite to the linkage mechanism 11 When the direction is unscrewed (i.e., the adjustment module R is loosened), the first and second coil springs 82, 84 can be elastically stretched to complete the adjustment of the torque reduction.

In particular, when the adjusting nut 4 of the electric screwdriver is rotated, since the inner cylinder 3 is rotated together with the adjusting nut 4, the inner cylinder 3 is rotated together with the two positioning members 32, so that the positioning member 32 can surround the cylinder 2. The inner wall is rotated, that is, the two positioning members 32 are selectively elastically clamped into any of the opposing grooves 22, thereby achieving precise torque adjustment.

For example, referring to the third and third B diagrams and referring to the second and third figures, the inner wall of the cylinder 2 has six grooves 22 equally spaced, and when the user rotates the adjustment nut 4 During the lap, the positioning member 32 is sequentially engaged in the first groove 22 to the sixth groove 22 and finally stopped in the original first groove 22, thereby completing a 360 degree rotation. In other words, the angle between any two adjacent grooves 22 is 60 degrees, and the user can position a position every 60 degrees when adjusting the torque and clearly feel the paragraph sense of the positioning, so that the user can clearly and unambiguously It converts how much torque has been adjusted and how much torque needs to be adjusted.

Moreover, since each paragraph is rotated (there is a paragraph between any two grooves 22), the positioning member 32 is clamped in the corresponding groove 22 to form a positioning to allow the compressed first and second coil springs. 82, 84 will not be elastically stretched due to such positioning, thereby preventing the adjusted module R from being adjusted to be loose.

Further, since the adjusting nut 4 is screwed to the outside of the cylindrical body 2, it is possible to adjust the advancement or retreat of the nut 4 during the screwing to shield the scale 23 provided on the outer wall of the cylindrical body 2 Indication (as shown in the first figure) to allow the user to see the current torque value.

Of course, the more grooves 22 will improve the precision of the torque adjustment, as shown in the fourth figure, another embodiment of the present invention reveals the precise torque adjustment of the twelve grooves 22 (but this creation It is not limited to the twelve grooves 22, and the twelve grooves 22 are not necessary. The angle between any two adjacent grooves 22 is 30 degrees, and the user can generate a positioning every 30 degrees when adjusting the torque. And clearly feel the sense of paragraph of this positioning.

In summary, the present invention has the following main functions compared to the prior art: by providing a plurality of grooves 22 axially in the inner wall of the cylinder 2, an adjusting nut is screwed outside the cylinder 2 4, and the inner cylinder 3 is provided with the positioning member 32 and can also rotate along with the adjusting nut 4, and the positioning member 32 can be selectively elastically clamped in at least one of the grooves 22, etc. It has the following effects: it can precisely adjust the required torque, can prevent the adjustment module R from being adjusted in a loose position, and can also have a clear and clear sense of paragraph when performing torque adjustment.

The above is only a preferred and feasible embodiment of the present invention, and thus does not limit the scope of the patent of the creation, and the equivalent structural changes that are made by using the present specification and the contents of the schema are all included in the creation. Within the scope of the rights, it is given to Chen Ming.

1‧‧‧ Ontology

11‧‧‧ linkage agency

12‧‧‧Drive shaft

121‧‧‧ Positioning Department

122‧‧‧Second buckle

2‧‧‧Cylinder

21‧‧‧ external thread section

22‧‧‧ trench

3‧‧‧Inner tube

301‧‧‧ inner end

302‧‧‧Outside

32‧‧‧ Positioning components

35‧‧‧ concave edge

36‧‧‧First buckle

4‧‧‧Adjusting nut

42‧‧‧Threaded section

5‧‧‧ collar

6‧‧‧ release spring

7‧‧‧Sleeve

8‧‧‧Flexible components

81‧‧‧ bushing

82‧‧‧First coil spring

83‧‧‧ spacer

84‧‧‧Second coil spring

Claims (10)

A torque adjustment structure for an electric screwdriver, the electric screwdriver having a transmission shaft, the torque adjustment structure comprising:
a cylindrical body, sleeved outside the transmission shaft and provided with an externally threaded section, the inner wall of the cylinder body is axially opened with a plurality of grooves arranged at intervals;
An adjustment module includes an adjustment nut and an inner cylinder that is inserted into the adjustment nut and rotates together with the adjustment nut, and the adjustment nut is provided with an internal thread segment that is screwed to the external thread segment. The inner cylinder is sleeved on the transmission shaft and is provided with at least one positioning component, the positioning component is selectively elastically fixed in any of the grooves; and an elastic component is sleeved on the transmission shaft. And one end of the elastic component is elastically abutted against one end of the inner cylinder. The torque adjustment structure of the electric screwdriver according to claim 1, wherein the inner cylinder is provided with at least one positioning hole, the positioning element is disposed in the positioning hole, and the inner cylinder corresponds to the inner edge and the outer position of the positioning hole. The rim is respectively surrounded by a C-shaped retaining ring and a C-shaped covering ring, and the C-shaped covering ring is provided with a limiting hole corresponding to the positioning component, and the positioning component is located at the limiting hole of the C-shaped covering ring Between the C-shaped retaining rings. The torque adjustment structure of the electric screwdriver according to claim 1, wherein the adjustment module further comprises a ring, a release spring and a sliding sleeve located in the inner cylinder, the collar being sleeved on the transmission shaft And only movable toward the free end of the transmission shaft, the sliding sleeve is sleeved on the transmission shaft and can only move in a direction opposite to the free end of the transmission shaft, and the release spring is sleeved on the transmission shaft and Elastically supported between the collar and the sliding sleeve. A torque adjustment structure for an electric screwdriver according to claim 3, wherein the collar is adjacent between an outer edge of the drive shaft and an inner edge of the inner cylinder. The torque adjustment structure of the electric screwdriver according to claim 1, wherein the adjusting nut defines an opening, the inner ring is provided with a concave edge and a buckle is buckled, and the opening of the adjusting nut is corresponding to the card. The axial interference between the concave edge and the buckle is axially interfered with each other. The torque adjustment structure of the electric screwdriver according to claim 5, wherein the inner ring of the adjusting nut is provided with a concave and convex portion, and the outer ring of the inner cylinder is provided with a corresponding concave and convex portion corresponding to the concave and convex portion. The inner cylinder is rotatable together with the adjustment nut through the concavo-convex portion and the corresponding concavo-convex portion. The torque adjustment structure of the electric screwdriver according to claim 1, wherein the elastic component comprises a bushing sleeved on the drive shaft, a first coil spring sleeved on the bushing, and sleeved on the bushing a spacer ring and a second coil spring sleeved on the transmission shaft, the first coil spring is elastically supported between the bushing and one side of the spacer ring, and the second coil spring is elastically supported on the spacer The other side of the ring is between the end of the inner barrel. The torque adjustment structure of the electric screwdriver according to claim 1, wherein the inner cylinder is provided with two positioning elements, and the two positioning elements are selectively elastically respectively engaged in any of the grooves. The torque adjustment structure of the electric screwdriver according to claim 8, wherein the inner cylinder is provided with two positioning holes, the two positioning elements are respectively disposed in the two positioning holes, and the inner cylinder corresponds to the position of each of the positioning holes. The inner edge and the outer edge are respectively surrounded by a C-shaped retaining ring and a C-shaped covering ring, and the C-shaped covering ring is provided with two limiting holes respectively corresponding to the two positioning elements, and the two positioning elements are respectively located in the C shape The two limiting holes of the covering ring are between the C-shaped retaining ring. A torque adjustment structure for an electric screwdriver according to claim 2 or 8, wherein the positioning member is a steel ball.