Electric constant-torque electric gun

Abstract

The invention relates to the field of electric assembly tools, in particular to an electric constant-torque electric gun which comprises a support fixedly connected with an electric gun shell structure. The input shaft is used for being fixedly connected with a shaft of the driving motor, and the position of the input shaft relative to the electric gun shell structure is unchanged; a sliding block is sleeved with the shaft sleeve in a one-freedom-degree sliding mode along the axis of the shaft sleeve, and one end of the sliding block is in threaded connection with the input shaft. According to the electric constant-torque electric gun, the effect of keeping output torque when the electric quantity of the battery is reduced can be achieved, the transmission ratio between the input shaft and the output shaft can be automatically adjusted according to the output torque of the driving motor and the load resistance as adjusting conditions, and therefore the output torque of the driving motor can be automatically adjusted after the voltage attenuation of the battery causes the torque reduction. The output torque of the output shaft is kept stable by reducing the transmission ratio and sacrificing the rotating speed of the output shaft, and the problem that in the prior art, the output torque of an electric pistol drill is lower than a set value range due to reduction of the electric quantity of a battery is effectively solved.

Description

Technical Field

[0001] This invention relates to the field of electric assembly tools, and in particular to an electric constant torque electric gun. Background Technology

[0002] Electric hand drills are very convenient for drilling or installing and removing fasteners. The battery pack used in electric hand drills is usually a series of multiple lithium batteries. Due to the characteristics of lithium batteries, the voltage of the lithium battery will gradually decrease during the discharge process, and the current that can be released will also weaken. Therefore, the output torque of the electric hand drill will also decrease over time.

[0003] Most electric pistol drills have torque adjustment functions. By turning the adjustment ring near the chuck, the corresponding torque setting can be adjusted to control the output torque of the electric pistol drill. When the output torque of the electric pistol drill exceeds its set clutch pressure threshold, the clutch will temporarily disengage. However, this adjustment method controls the maximum output torque of the electric pistol drill and does not prevent the output torque from decreasing due to battery consumption. Therefore, in order to optimize the above problem, an electric constant torque electric gun is proposed. Summary of the Invention

[0004] In view of the problem in the above or existing technology that the output torque of an electric pistol drill is lower than the set value range due to the decrease in battery power, the present invention is proposed.

[0005] Therefore, the object of the present invention is to provide an electric constant torque electric gun.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0007] An electric constant-torque stun gun includes: a bracket fixedly connected to a stun gun housing structure; an input shaft fixedly connected to the shaft of a drive motor, wherein the position of the input shaft relative to the stun gun housing structure remains unchanged; a bushing with a slider slidably fitted inside it along its axis with one degree of freedom, one end of the slider being threadedly connected to the input shaft, and a spring abutting between the end of the slider connected to the input shaft and the inner edge of the bushing opening; the end of the bushing away from the input shaft being rotatably connected to the bracket, and the other end of the slider being connected to a connecting rod that passes through the spring. The system comprises a spring, a bushing, and a bracket. On the side of the bracket away from the bushing, levers are arranged in a circular array about the connecting rod. One end of each lever is hinged to the bushing, and the other end of each lever is hinged to a short shaft. A telescopic sleeve is perpendicularly connected between the short shaft and the connecting rod, and the telescopic sleeve can slide along the axial direction of the connecting rod. A pad is provided on the outer wall of the connecting rod corresponding to the lever position to abut against the lever. An output shaft is rotatably connected to the top of the bracket, and a belt is sleeved between the output shaft and the short shaft. A tensioning shaft is pressed against the outside of the belt.

[0008] As a preferred embodiment of the electric constant torque electric gun of the present invention, the inner wall of the bushing is provided with a fan-shaped groove parallel to its circumference, the arc axis of the fan-shaped groove is coaxial with the bushing, the arc of the fan-shaped groove is 60 degrees, and the three grooves are distributed in a ring array about the bushing, and the outer wall of the slider is slidably connected to the groove.

[0009] As a preferred embodiment of the electric constant torque electric gun of the present invention, the clockwise rotation of the output shaft is taken as the reference, and the rotation direction of the connecting thread between the output shaft and the slider is also clockwise.

[0010] In a preferred embodiment of the electric constant torque electric gun of the present invention, the tensioning shaft consists of a rotating middle section and two ends for assembly. A pair of parallel insert rods are slidably inserted into the two ends of the tensioning shaft along its radial direction, and one end of the insert rod is fixedly connected to the cantilevered part of the bracket. A spring is sleeved on one end of the insert rod that passes through the tensioning shaft.

[0011] In a preferred embodiment of the electric constant torque electric gun of the present invention, the input shaft, connecting rod, short shaft and output shaft are parallel to each other, and the end of the insertion rod is connected to a nut for adjusting the pressure of the second spring.

[0012] In a preferred embodiment of the electric constant torque electric gun of the present invention, the output shaft is fixedly sleeved with a pulley, and the outer wall of both the pulley and the short shaft is provided with anti-slip grooves parallel to their axial direction, and the belt is a toothed belt that meshes with the pulley and the short shaft.

[0013] In a preferred embodiment of the electric constant torque electric gun of the present invention, a retaining spring is engaged inside the opening of the bushing, and one end of the spring abuts against the retaining spring.

[0014] In a preferred embodiment of the electric constant torque electric gun of the present invention, a ring is fixedly connected between the close ends of the telescopic sleeves, and the ring is slidably sleeved with the connecting rod.

[0015] In a preferred embodiment of the electric constant torque electric gun of the present invention, the hinge shaft between the lever and the short shaft and the bushing is parallel to each other, and the hinge shaft is perpendicular to the connecting rod.

[0016] In a preferred embodiment of the electric constant torque electric gun of the present invention, the two ends of the lever are rectangular, the cross-section of the pad is fan-shaped, and the outer wall of the lever and the arc surface of the pad are in line contact.

[0017] The beneficial effects of the electric constant torque electric gun of the present invention: The present invention provides an electric constant torque electric gun that can maintain the output torque when the battery power is reduced. It can adjust the transmission ratio between the input shaft and the output shaft according to the output torque of the drive motor and the load resistance as adjustment conditions. Thus, after the battery voltage decays and the drive motor torque decreases, the output torque of the output shaft is kept stable by reducing the transmission ratio and sacrificing the output shaft speed. This effectively solves the problem in the prior art where the output torque of the electric pistol drill is lower than the set value range due to the decrease in battery power. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of an electric constant torque electric gun.

[0020] Figure 2 for Figure 1 A structural diagram from another perspective.

[0021] Figure 3 This is a partial structural cross-sectional view of an electric constant torque electric gun.

[0022] Figure 4 for Figure 3 Further disassembly diagram of a local part of the structure.

[0023] In the diagram: 100, bracket; 101, input shaft; 102, bushing; 1021, slide groove; 103, slider; 104, spring one; 105, snap ring; 106, connecting rod; 1061, pad; 107, lever; 108, short shaft; 109, telescopic sleeve; 110, output shaft; 111, belt; 112, pulley; 113, tensioning shaft; 114, insertion rod; 115, spring two. Detailed Implementation

[0024] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0025] Example, refer to Figures 1-4 This embodiment provides an electric constant torque electric gun that can maintain the output torque when the battery power is low.

[0026] refer to Figure 1 and Figure 2The present invention includes a bracket 100, which is fixedly connected to the electric gun housing structure; an input shaft 101, which is fixedly connected to the shaft of a drive motor, and the position of the input shaft 101 relative to the electric gun housing structure remains unchanged; Reference Figure 3 and Figure 4 A bushing 102 has a slider 103 slidably fitted inside it along its axis with one degree of freedom. One end of the slider 103 is threadedly connected to the input shaft 101, and a spring 104 abuts against the end of the slider 103 connected to the input shaft 101 and the inner edge of the opening of the bushing 102. The end of the bushing 102 away from the input shaft 101 is rotatably connected to the bracket 100, and the other end of the slider 103 is connected to a connecting rod 106. The connecting rod 106 passes through the spring 104, the bushing 102, and the bracket 100. On the side of the bracket 100 away from the bushing 102, levers 107 are arranged in a ring array with respect to the connecting rods 106. One end of each lever 107 is hinged to the bushing 102. (Reference) Figure 1 and Figure 3 The other end of each lever 107 is hinged to a short shaft 108. A telescopic sleeve 109 is vertically connected between the short shaft 108 and the connecting rod 106. The telescopic sleeve 109 can slide along the axial direction of the connecting rod 106. A pad 1061 is provided on the outer wall of the connecting rod 106 at the position corresponding to the lever 107 to abut against the lever 107. The output shaft 110 is rotatably connected to the top of the bracket 100. A belt 111 is sleeved between the output shaft 110 and the short shaft 108. A tensioning shaft 113 is pressed against the outside of the belt 111.

[0027] This invention provides an electric constant torque electric gun, which mainly provides a speed change structure for an electric pistol drill. This speed change structure can adjust the transmission ratio between the input shaft 101 and the output shaft 110 based on the output torque of the drive motor (that is, the torque of the input shaft 101) and the rotational resistance of the output shaft 110 as adjustment conditions. Thus, after the battery voltage decays and the torque of the drive motor decreases, the output torque of the output shaft 110 is kept stable by reducing the transmission ratio and sacrificing the rotational speed of the output shaft 110.

[0028] The principle behind achieving the above function is as follows: taking the clockwise rotation of the output shaft 110 as a reference, the thread connecting the output shaft 110 and the slider 103 also rotates clockwise. Furthermore, when the output shaft 110 is under load, the input shaft 101 rotates clockwise under the drive of the electric pistol drill's motor. (Refer to...) Figure 3When the input shaft 101 rotates, it tends to screw the thread into the slider 103. Taking the housing structure of the electric pistol drill as a reference, the positions of the bracket 100, bushing 102 and input shaft 101 are relatively constant. This makes the slider 103 tend to slide along the groove 1021 to compress the spring 104. When the elastic force of the spring 104 and the pulling force of the input shaft 101 acting on the slider 103 along the groove 1021 through the thread reach a balance, the slider 103 rotates with the input shaft 101. The slider 103 then drives the rotation of the bushing 102 and other connecting parts through the groove 1021.

[0029] Obviously, when the output torque of the motor decreases, the pressure of the slider 103 on the spring 104 also decreases. Under the push of the spring 104, both the slider 103 and the connecting rod 106 connected to its shaft end move away from the input shaft 101. Figure 1 Taking the perspective as an example, when the connecting rod 106 moves to the right, the pad 1061 on the connecting rod 106 also moves away from the hinge point between the lever 107 and the connecting rod 106. This reduces the angle between the lever 107 and the connecting rod 106. Therefore, under the action of the spring 115 and the tension shaft 113, the belt 111 tightens the short shaft 108 and the lever 107, which reduces the diameter of the turntable structure composed of multiple short shafts 108 connecting the lever 107, while the diameter of the pulley 112 on the output shaft 110 remains unchanged. Therefore, the transmission ratio decreases, the speed of the output shaft 110 decreases, but the torque is maintained.

[0030] Conversely, when a new battery is inserted, the input shaft 101 has sufficient torque. Under load on the output shaft 110, the slider 103 will significantly compress the spring 104. The pad 1061 on the connecting rod 106 will be squeezed back between the lever 107 and the connecting rod 106, spreading the lever 107 and the short shaft 108 apart. This increases the diameter of the turntable formed by the short shaft 108, thereby converting the excess input torque into a higher output shaft 110 speed. The cross-sections of both ends of the lever 107 are rectangular, and the cross-section of the pad 1061 is fan-shaped. Furthermore, the outer wall of the lever 107 and the arc surface of the pad 1061 are in line contact, making the movement of the pad 1061 smoother.

[0031] To achieve the above functions, the present invention also involves the following technical details:

[0032] Firstly, the inner wall of the bushing 102 is provided with a fan-shaped groove 1021 parallel to its circumference. The fan-shaped arc axis of the groove 1021 is coaxial with the bushing 102. The fan-shaped arc of the groove 1021 is sixty degrees. The groove 1021 is arranged in a ring array with three grooves about the bushing 102. The outer wall of the slider 103 is slidably connected to the groove 1021.

[0033] Secondly, the tensioning shaft 113 consists of a rotating middle section and two ends for assembly. A pair of parallel insert rods 114 are slidably inserted into the two ends of the tensioning shaft 113 along its radial direction, and one end of the insert rod 114 is fixedly connected to the cantilevered part of the bracket 100. A spring 115 is sleeved on one end of the insert rod 114 through the tensioning shaft 113. The input shaft 101, connecting rod 106, short shaft 108 and output shaft 110 are parallel to each other. A nut is connected to the end of the insert rod 114 to adjust the pressure of the spring 115. The tension of the belt 111 can be set to match the spring 104. The output shaft 110 is fixedly sleeved with a pulley 112, and the outer walls of the pulley 112 and the short shaft 108 are provided with anti-slip grooves parallel to their axial direction. The belt 111 is a toothed belt that meshes with the pulley 112 and the short shaft 108, so that the toothed belt drive structure, similar to a synchronous belt, can prevent belt drive slippage to the maximum extent.

[0034] Third, a retaining ring 105 is snapped into the inner side of the opening of the bushing 102, one end of the spring 104 abuts against the retaining ring 105, and a ring is fixedly connected between the close ends of the telescopic sleeve 109. The ring is slidably connected to the connecting rod 106. The hinge axis between the lever 107, the short shaft 108, and the bushing 102 is parallel to each other, and the hinge axis is perpendicular to the connecting rod 106.

[0035] In summary, this invention provides an electric constant torque drill that can maintain output torque when the battery power decreases. It can automatically adjust the transmission ratio between the input shaft 101 and the output shaft 110 based on the output torque of the drive motor and the load resistance as adjustment conditions. Thus, after the battery voltage decays and the drive motor torque decreases, the output torque of the output shaft 110 is kept stable by reducing the transmission ratio and sacrificing the rotational speed of the output shaft 110. This effectively solves the problem in the prior art where the output torque of an electric pistol drill is lower than the set value range due to the decrease in battery power.

[0036] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An electric constant-torque stun gun, characterized in that, include: The bracket (100) is fixedly connected to the electric gun housing structure; The input shaft (101) is used to be fixedly connected to the shaft of the drive motor, and the position of the input shaft (101) relative to the electric gun housing structure remains unchanged; A bushing (102) has a slider (103) slidably fitted inside it along its axis with one degree of freedom. One end of the slider (103) is threadedly connected to the input shaft (101), and a spring (104) abuts between the end of the slider (103) connected to the input shaft (101) and the inner edge of the opening of the bushing (102). The end of the bushing (102) away from the input shaft (101) is rotatably connected to the bracket (100), and the other end of the slider (103) is connected to a connecting rod (106), which passes through the spring (104), the bushing (102), and the bracket (100). On the side of the bracket (100) away from the bushing (102), levers (107) are arranged in a ring array with respect to the connecting rod (106). One end of each lever (107) is hinged to the bushing (102), and the other end of each lever (107) is hinged to a short shaft (108). A telescopic sleeve (109) is vertically connected between the short shaft (108) and the connecting rod (106), and the telescopic sleeve (109) can slide along the axial direction of the connecting rod (106). A pad (1061) is provided on the outer wall of the connecting rod (106) at the position corresponding to the lever (107) to abut against the lever (107). An output shaft (110) is rotatably connected to the top of a bracket (100), and a belt (111) is sleeved between the output shaft (110) and a short shaft (108), with a tensioning shaft (113) pressed against the outside of the belt (111).

2. The electric constant torque electric gun as described in claim 1, characterized in that: The inner wall of the bushing (102) is provided with a fan-shaped groove (1021) parallel to its circumference. The fan-shaped arc axis of the groove (1021) is coaxial with the bushing (102). The fan-shaped arc of the groove (1021) is sixty degrees. The groove (1021) is arranged in a ring array with three grooves about the bushing (102). The outer wall of the slider (103) is slidably connected to the groove (1021).

3. The electric constant torque electric gun as described in claim 1, characterized in that: With the clockwise rotation of the output shaft (110) as a reference, the direction of the connecting thread between the output shaft (110) and the slider (103) is also clockwise.

4. The electric constant torque electric gun as described in claim 1, characterized in that: The tensioning shaft (113) consists of a rotating middle section and two ends for assembly. A pair of parallel insert rods (114) are slidably inserted into the two ends of the tensioning shaft (113) along its radial direction. One end of the insert rod (114) is fixedly connected to the overhanging part of the bracket (100). A spring (115) is sleeved through one end of the insert rod (114) through the tensioning shaft (113).

5. The electric constant torque electric gun as described in claim 4, characterized in that: The input shaft (101), connecting rod (106), short shaft (108) and output shaft (110) are parallel to each other, and the end of the insert rod (114) is connected to a nut for adjusting the pressure of spring two (115).

6. The electric constant torque electric gun as described in claim 5, characterized in that: The output shaft (110) is fixedly sleeved with a pulley (112), and the outer walls of the pulley (112) and the short shaft (108) are provided with anti-slip grooves parallel to their axial direction. The belt (111) is a toothed belt that meshes with the pulley (112) and the short shaft (108).

7. The electric constant torque electric gun as described in claim 1, characterized in that: A retaining ring (105) is engaged inside the opening of the bushing (102), and one end of the spring (104) abuts against the retaining ring (105).

8. The electric constant torque electric gun as described in claim 1, characterized in that: A ring is fixedly connected between the close ends of the telescopic sleeve (109), and the ring is slidably sleeved with the connecting rod (106).

9. The electric constant torque electric gun as described in claim 8, characterized in that: The hinge axis between the lever (107) and the short shaft (108) and the bushing (102) is parallel to each other, and the hinge axis is perpendicular to the connecting rod (106).

10. The electric constant torque electric gun as described in claim 1, characterized in that: The two ends of the lever (107) are rectangular, the cross-section of the pad (1061) is fan-shaped, and the outer wall of the lever (107) and the arc surface of the pad (1061) are in line contact.

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