TWI520817B - Torque control mechanism and torque control method of power tool - Google Patents

Description

Torque control mechanism and torque control method of power tool

The present invention relates to an impact type power tool, and more particularly to a torque control mechanism and a torque control method for a power tool that uses a displacement of a seat to generate a signal for calculation and processing.

According to the conventional impact type electric tool (such as an electric impact wrench, etc.), the structure generally includes a motor, a shifting gear set, a drive shaft, a striking group (such as a power output shaft, a seat block), a control system, and the like, and a shifting gear set. Connected to one end of the motor to change the rotational power of the motor output, the drive shaft is connected to the shift gear set, and the output shaft is coaxially connected to one end of the drive shaft in a rotatable manner, and is connected to a working joint such as a screwdriver or a sleeve. The hitting seat sleeve is sleeved on the transmission shaft, and can be reciprocally displaced along a direction of the transmission shaft at a striking and releasing position, and one end of the output shaft and the end of the striking shaft respectively have a striking block for striking the seat. When moving to the striking position, each striking block can be abutted and struck, so that the output shaft can be rotated by being hit and used for locking screws or nuts.

In order to make the power tool automatically stop when the workpiece is set to the position (such as the locking screw), the impact type power tools seen in recent years are often equipped with feedback and control systems (such as fully automatic or semi-automatic power tools), which are generally used. Techniques such as measuring current or torque (torque) changes, and judging power tools The load and operating state, which in turn causes the power tool to stop or perform other actions (such as compensating, compensating, etc.).

The above-mentioned method of adding current or torque (torque) sensing electronic components and related circuits can make the operation of the impact type electric tool more precise, but will greatly increase the mechanism complexity and manufacturing cost of the electric tool, so that the product is The price is high.

The reason is that the present inventors have been based on the experience of many years of research and development of electric tools, and have obtained the invention which is lacking in improvement.

The main object of the present invention is to provide a torque control mechanism and a torque control method for a power tool, which do not need to change the original configuration of the power tool, and skillfully use the moving state of the seat to generate a signal for the control system calculation of the power tool. The process can protect the workpiece from the action of compensating, compensating, replenishing or stopping the operation, avoiding damage to the workpiece due to excessive torque output, and accurately cutting and controlling the torque output time, resulting in power saving and energy saving effects. Very economic value.

In order to achieve the foregoing objective, the present invention provides a torque control mechanism for a power tool, comprising at least one drive shaft, a power output shaft coaxially pivoted to one end of the drive shaft, and a hitting seat, which can be used in a first a second position is reciprocally displaceably disposed on the transmission shaft, and a plurality of second striking blocks protruding from one end of the output shaft corresponding to the first striking block are protruded at one end thereof, and when the striking seat is in the first position, the The first hitting block abuts and slams the corresponding second hitting block, so that The output shaft is subjected to a rotation motion by a striking force. When the seat is in the second position, the first and second striking blocks are separated by an appropriate distance; and a detecting component is disposed at one end of the striking seat away from the corresponding output shaft. And electrically connected to the control system of the power tool.

In addition, the present invention further provides a torque control method for a power tool, the power tool includes at least one drive shaft for connecting a power source of the power tool, and a power output shaft coaxially pivoted to one end of the drive shaft, and one end of the power shaft is provided with a plurality of Block: a hitting seat, sleeved on the transmission shaft, reciprocally displaceable along a direction of the transmission shaft between a first and a second position, and one end of the block has a plurality of blocks corresponding to the output shaft When the hitting seat is in the first position, the hitting block abuts and taps the corresponding block, and the output shaft is subjected to the rotation force by the striking force. When the hitting seat is in the second position, the hitting block is Is disposed at an appropriate distance from the card block system; the torque control method is configured to set a detecting component at one end of the killing seat away from the corresponding output shaft, and electrically connect the detecting component to the control system of the power tool for moving the seat When the second position is reached, the detecting component can output a signal.

Further, the power tool further includes a motor and a shifting gear set disposed at a power output end of the motor and coupled to the drive shaft.

Further, a spring is further included, and the sleeve is disposed on the transmission shaft and between the seat and the end of the shifting gear set.

Further, the shot is made of a metal material, and the detecting element is Hall element.

Further, the motor is a brushless motor.

10‧‧‧Torque Control Agency

12‧‧‧ motor

13‧‧‧Transmission gear set

14‧‧‧Drive shaft

15‧‧‧Output shaft

16‧‧‧Beat seat

17‧‧‧ Spring

18‧‧‧Detection components

22‧‧‧ card block

24‧‧‧Block

The first figure is a combined perspective view of a preferred embodiment of the present invention.

The second drawing is another assembled perspective view of a preferred embodiment of the present invention in which the slamming system is moved to the striking position.

The third figure is an action diagram of a preferred embodiment of the present invention, showing the state in which the seat is moved to the striking position.

The fourth figure is an action diagram of a preferred embodiment of the present invention, showing that the seat is retracted to a position detectable by the detecting component.

In the following, the second preferred embodiment of the present invention will be further described in detail with reference to the drawings. First, referring to the first and second figures, the torque control of the power tool according to a preferred embodiment of the present invention is shown. The power tool can be a pneumatic or electric power tool. The power tool of the embodiment is at least one motor 12, which can be a brushless motor or other type of motor. This embodiment is a brushless motor and a shifting machine. The gear set 13 is disposed at the power output end of the motor 12, and a transmission shaft 14 is connected to the shift gear set 13. The shift gear set 13 can shift the rotational power transmitted by the motor 12 (such as deceleration) to drive the shaft. 14 is rotated at a predetermined speed, a power output shaft 15 is coaxially pivoted (sleeve) to the drive shaft At one end of the 14th, a tool head for socketing a screwdriver or a bolt for a locking screw, and one end of the shifting gear set 13 is provided with two opposite latching blocks 22, and one hitting seat 16 is open at one end. The sleeve is sleeved on the transmission shaft 14 and is reciprocally displaceable along a first axial direction of the transmission shaft 14 at a first position and a second position. The second end of the transmission shaft 14 is opposite to the output shaft 15 . The block 22, when the seat 16 is in the first position (away from the shift gear set 13), the block 24 abuts and strikes the corresponding block 22, and the output shaft 15 is subjected to the force of the hitting. During the rotation movement, when the seat 16 is in the second position (near the shift gear set 13), the block 24 is spaced apart from the block 22 by a suitable distance, and a spring 17 is placed on the drive shaft 14 and interposed The inner end of the 16 is disposed between the outer end of the shift gear set 13 and the outer end of the shift gear set 13; the components of the motor 12, the shifting gear set 13, the drive shaft 14, the output shaft 15 and the seat 16 are the same as those of the conventional power tool, and are of the prior art. The detailed construction and operation mode of the power tool are not described herein. The torque control mechanism 10 of the power tool of the present invention is Further included: a detecting component 18, which is a conventional magnetic sensing Hall component, and of course other types of detecting components, disposed on one side of the shifting gear set 13 (away from one end of the corresponding output shaft 15) and electrically A control system (not shown) for connecting the power tool is configured to output a signal to the control system of the power tool when the metal material is moved to the second position and sensed.

Thereby, the characteristics and effects of the torque control mechanism 10 of the power tool of the present invention are as follows: when the power tool is operated, the seat 16 is moved to the first Position (Beat Position), as shown in the second and third figures, each of the blocks 24 corresponds to the abutment block 22, so that the rotational power of the drive shaft 14 can be transmitted to the output shaft 15, and the output shaft 15 is urged. It can be operated and operated by locking screws and nuts. When the load of the output shaft 15 reaches a preset limit (for example, a screw or a nut has been locked), the seat 16 can be sunk and moved toward the second position, and when the seat 16 moves to the detecting element When the detection position of 18 (the second position), as shown in the fourth figure, the detecting component 18 can send a signal to the control system of the power tool, and the control system of the power tool can calculate and process the power. The tool can perform operations such as compensating, replenishing, replenishing power or stopping the motor 12, so that the workpiece can be protected, the workpiece can be damaged due to excessive torque output, and the torque output time can be accurately cut and controlled, resulting in power saving, Energy saving and other effects.

In other words, the present invention skillfully utilizes the movement state of the slap 16 and cooperates with the detection of the detection component 18 to generate a signal as a basis for the control system of the power tool to perform related operations.

As can be seen from the above, the present invention further provides a torque control method for a power tool, which is provided with a detecting component 18 at a side of the shifting gear set 13 of the power tool from the corresponding output shaft 15 and the detecting component 18 The control system of the power tool is electrically connected to the detecting component 18 to output a signal to the control system when the seat 16 is moved to the second position.

Secondly, the torque control mechanism of the power tool of the present invention is not limited to the previously disclosed electric power tool, and can also be applied to a power tool such as a pneumatic.

In summary, the torque control mechanism of the power tool of the present invention And the torque control method, which does not need to change the original configuration of the power tool, and by using the addition of the detecting component, skillfully uses the moving state of the seat to generate a signal, so that the power tool can perform the compensating, compensating, and supplementing Power or stop the motor, etc., can protect the workpiece, avoid damage to the workpiece due to excessive torque output, and can accurately cut off and control the torque output time, resulting in power saving, energy saving, etc., compared to impact-type power tools, The invention is obviously more compact, direct and effective, and has great economic value.

However, the above is only a few preferred embodiments of the present invention, and the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the invention.

10‧‧‧Torque Control Agency

12‧‧‧ motor

13‧‧‧Transmission gear set

15‧‧‧Output shaft

16‧‧‧Beat seat

17‧‧‧ Spring

18‧‧‧Detection components

22‧‧‧ card block

24‧‧‧Block

Claims (2)

A torque control mechanism for a power tool includes at least: a transmission shaft connecting a power source of the power tool; and a power output shaft coaxially pivoted to one end of the transmission shaft, and one end of the transmission shaft is provided with a plurality of blocks: a seat block, a sleeve Provided on the transmission shaft, reciprocally displaceable along a direction of the transmission shaft between a first position and a second position, and one end of the transmission shaft protrudes with a plurality of blocks corresponding to the output shaft, the seat is located at the first position When the hitting block abuts and strikes the corresponding block, the output shaft is subjected to the rotation force by the striking force, and when the hitting seat is in the second position, the hitting block is separated from the block by an appropriate distance; a motor and a shifting gear set, the shifting gear set is disposed at a power output end of the motor and coupled to the drive shaft; a spring is disposed on the drive shaft and between the seat and the end of the shifting gear set; and a detecting component disposed on one side of the shifting gear set and located at one end of the striking seat away from the corresponding output shaft and electrically connected to the control system of the power tool for controlling the end of the seat when the seat is moved to the second position Detection element It should range, the detecting element may transmit signals to the control system of the power tool. A torque control method for a power tool, the power tool includes at least one transmission shaft connected to a power source of the power tool; a power output shaft coaxially pivoted to one end of the transmission shaft, and one end of which is provided with a plurality of blocks; The sleeve is disposed on the transmission shaft, and is reciprocally displaceable along a first axial direction and a second position of the transmission shaft, and one end of the transmission shaft protrudes with a plurality of blocks corresponding to the output shaft, and the seat is located at the first In a position, the hitting block abuts and slams the corresponding block, so that The output shaft is subjected to a rotation motion by a striking force. When the seat is in the second position, the block is separated from the block by an appropriate distance; a motor and a shift gear set, the shift gear set is set on the power of the motor The output end is connected to the transmission shaft; a spring is sleeved on the transmission shaft and is between the seat and the end of the transmission gear set; the torque control method is to set a detection component at one end of the base away from the corresponding output shaft, And electrically connecting the detecting component to the control system of the power tool, wherein when the load of the output shaft reaches a preset limit value and the seat is moved to the second position, one end of the seat enters the detecting component The sensing range, the detecting component can transmit signals to the control system of the power tool.