CN221338344U - Electric and manual dual-purpose ratchet wrench - Google Patents

Abstract

The utility model discloses an electric and manual dual-purpose ratchet wrench, which belongs to a torque force application manual tool, and the torque force output by the existing ratchet wrench is difficult to screw a workpiece exactly. When the torque-applying device is used, the workpiece is quickly screwed in an electric mode, the workpiece is screwed in a larger torque force in a manual mode, the torque force is easily controlled according to needs when the torque force is manually applied, and the excessive torque damage to the workpiece caused by excessive torque force is avoided.

Description

Electric and manual dual-purpose ratchet wrench

Technical Field

The utility model belongs to a torque force application tool, and particularly relates to an electric and manual dual-purpose ratchet wrench.

Background

Even if different gears exist, the torque output at the different gears is constant, and gears with smaller torque are usually selected when the electric wrench is used, so that the excessive torque is prevented from generating excessive torque damage to a workpiece, and the output torque is difficult to screw the workpiece right. Moreover, after the electric wrench rotates the workpiece by a certain angle, the condition of manual torque force is existed in the final fastening, and when the space is narrow, the electric wrench cannot be operated, so that the fastening is not in place.

Disclosure of utility model

The utility model aims to solve the technical problems and the technical task of overcoming the defect that the torque output by the traditional ratchet wrench is difficult to just screw a workpiece, and provides an electric and manual dual-purpose ratchet wrench which aims to screw the workpiece rapidly in an electric mode and screw the workpiece in a manual mode, and overcome the defect that the workpiece cannot be operated due to narrow space and cannot be fastened in place on the basis of the electric mode and the manual mode.

In order to achieve the above object, the utility model provides an electric and manual dual-purpose ratchet wrench, which is characterized by comprising:

a power output device is arranged in the handle, and the power output device is provided with an eccentric shaft positioned at the front end of the handle;

The head comprises a body member, a ratchet wheel, a pawl and an output member, wherein the body member is fixedly assembled at the front end of the handle, the ratchet wheel is matched with the eccentric shaft through unidirectional driving of the eccentric axial ratchet wheel to endow a ratchet wrench with an electric mode and a manual mode, the power output device outputs torque in the electric mode, the eccentric shaft drives the ratchet wheel to swing, the torque output by the power output device is intermittently transmitted to the output member through the pawl, the power output device does not output torque in the manual mode, and the handle drives the ratchet wheel to swing, so that the torque from the handle is intermittently transmitted to the output member through the pawl.

The unidirectional drive of the eccentric axial ratchet wheel means that the torsion from the eccentric shaft can drive the ratchet wheel to swing, otherwise, the torsion from the ratchet wheel can not drive the eccentric shaft to rotate, so that the torsion from the handle can be applied to the workpiece in the manual mode.

The ratchet wrench is used for rapidly screwing the workpiece in an electric mode and screwing the workpiece in a manual mode, so that the workpiece is prevented from being excessively damaged due to overlarge torsion.

In order to simplify the structure, the rear end of the ratchet wheel is provided with a shaft groove, a shaft section is arranged in the shaft groove, the shaft section is provided with a shaft hole, the axial direction of the shaft section is perpendicular to the axial direction of the shaft hole, and the eccentric shaft is assembled with the shaft hole. Therefore, the circular motion of the axle center of the eccentric shaft is converted into the swinging of the ratchet wheel through the axle section when the eccentric shaft rotates, the conversion of the motion is realized through the rotation of the eccentric shaft and the axle hole and the sliding of the axle section relative to the axle slot, the friction caused by the direct action of the eccentric shaft on the ratchet wheel and the deformation of the eccentric shaft are avoided, and the matching mode has small vibration and noise.

Specifically, the power output device comprises a motor and a speed reduction device, and the speed reduction device is positioned between the motor and the eccentric shaft and is used for reducing the rotation of the motor and then transmitting the rotation to the eccentric shaft. Moreover, the speed reducing device and the driving cooperation of the eccentric shaft and the ratchet wheel can form self-locking, so that torsion from the ratchet wheel can not promote the eccentric shaft to rotate.

For compact construction, the ratchet and the output member are coaxially arranged to the body member.

In order to avoid the overlarge head volume and ensure the output torque force, the ratchet wheel is suitable for being used in a narrow space, the body member is provided with a first wall and a second wall which are opposite, the first wall is provided with a first shaft hole, the second wall is provided with a second shaft hole, the first shaft hole is coaxial with the second shaft hole, the output member is rotatably assembled in the first shaft hole and the second shaft hole, the ratchet wheel is positioned between the first wall and the second wall and sleeved outside the output member, and the pawl is positioned between the ratchet wheel and the output member. In particular, the output member has an accommodation space between the shoulders, and the pawl is located in the accommodation space and is fitted to the shoulders by the pin shaft.

In order to change the direction of the torsion force applied by the ratchet wrench to the workpiece, the output member is provided with a through axial hole and a radial hole, a gear shaft is assembled in the axial hole, a pushing piece which is applied with the elasticity by the first elastic element to the radial direction is arranged on the gear shaft, the pushing piece extends out of the radial hole and is abutted against the pawl, and a knob is arranged at the outer end of the gear shaft. The knob rotates with the gear shaft to drive the pushing piece to change the position of the opposite pawl, so that the pawl changes the posture and torsion reversing is realized.

For ease of assembly, the output member is axially constrained to the body member by a retainer ring.

In order to avoid loosening of the output member, a gasket is arranged at one end of the output member, an elastic assembly is arranged on the output member, and the elastic assembly is elastically supported on the gasket and the output member in the axial direction. Accordingly, the output member is not axially movable no matter the output member is connected to the workpiece or removed from the workpiece, and the axial movement of the output member is prevented from affecting the use.

In order to reduce the resistance when the output member rotates, the elastic component comprises a marble and a second elastic element, a blind hole is arranged in the output member, the marble and the second elastic element are arranged in the blind hole, and the marble is supported on the gasket by the elastic force of the second elastic element.

In various embodiments, the portion of the gasket corresponding to the pins is either planar, whereby the thickness of the gasket as a whole may be reduced, or the groove, whereby the pins may be guided by the groove.

In narrow and small space, the handle is difficult to rotate great angle for the work piece, when the rotation angle of handle is less than the central angle that two adjacent ratchets correspond on the ratchet, is difficult to apply torsion through the handle, consequently, can increase the ratchet number of ratchet when manufacturing the product and reduce the central angle that two adjacent ratchets correspond, so, can cause the profile of ratchet to diminish, the biggest torsion that whole ratchet spanner can bear diminishes. To overcome this disadvantage, the pawls include n, n being 2 or 3, wherein one of the pawls engages the ratchet wheel at an angle different from the ratchet wheel engagement by an angle α/n, where α is the corresponding central angle of two adjacent ratchet teeth on the ratchet wheel. Therefore, when torsion is applied to the handle, the handle is only required to be rotated by an angle alpha/n, and one pawl can be switched to be meshed with the ratchet wheel when the other pawl is meshed with the ratchet wheel, so that the ratchet wheel is ensured to have a large enough outline to bear large torsion, the handle can be rotated by a small angle to realize the meshing of different pawls and the ratchet wheel, and torsion is intermittently applied to a workpiece.

The utility model provides a ratchet wrench, which is characterized in that a head is arranged at the front end of a handle, a ratchet wheel of the head is matched with an eccentric shaft of the handle through unidirectional drive of an eccentric axial ratchet wheel, a ratchet wrench electric mode and a manual mode are provided, a power output device outputs torque in the electric mode, the eccentric shaft drives the ratchet wheel to swing, the torque output by the power output device is intermittently transmitted to an output member through a pawl, the power output device does not output torque in the manual mode, and the handle drives the ratchet wheel to swing, so that the torque from the handle is intermittently transmitted to the output member through the pawl. When the torque-applying device is used, the workpiece is quickly screwed in an electric mode, the workpiece is screwed in a larger torque force in a manual mode, the torque force is easily controlled according to needs when the torque force is manually applied, and the excessive torque damage to the workpiece caused by excessive torque force is avoided.

According to the utility model, n pawls are configured, n is 2 or 3, and when one pawl is meshed with the ratchet wheel, one of the other pawls is meshed with the ratchet wheel by an angle of alpha/n, wherein alpha is the central angle corresponding to two adjacent ratchet wheels on the ratchet wheel. Therefore, when torsion is applied to the handle, the handle is only required to be rotated by an angle alpha/n, and one pawl can be switched to be meshed with the ratchet wheel when the other pawl is meshed with the ratchet wheel, so that the ratchet wheel is ensured to have a large enough outline to bear large torsion, the handle can be rotated by a small angle to realize the meshing of different pawls and the ratchet wheel, and torsion is intermittently applied to a workpiece. Is suitable for being used in a narrow space.

Drawings

FIG. 1 is an isometric view of a ratchet wrench of the present utility model;

FIG. 2 is an exploded view of the ratchet wrench of FIG. 1;

FIG. 3 is an exploded view of the head and eccentric shaft of the present utility model;

FIG. 4 is a schematic diagram of the eccentric shaft and ratchet assembly relationship of the present utility model;

FIG. 5 is a schematic view of the eccentric shaft of the present utility model assembled with a ratchet via a shaft section;

FIG. 6 is an exploded view of the head of the present utility model;

FIG. 7 is a schematic diagram of another view of the structure of FIG. 6;

FIG. 8 is a schematic front view of the head of the present utility model assembled with an eccentric shaft;

FIG. 9 is a cross-sectional view taken along A-A of FIG. 8;

FIG. 10 is a B-B cross-sectional view of FIG. 8;

The reference numerals in the figures illustrate:

100 handles, 110 eccentric shafts, 120 speed reducing devices, 130 motors, 140 batteries, 150 tail covers, 160 lamp beads, 170 switch controls, 180 first shells and 190 second shells;

A head portion of 200 a,

210, 211 First wall, 212 second wall, 213 first shaft aperture, 214 second shaft aperture,

220 Ratchet wheel, 221 shaft groove, 222 shaft section, 223 shaft hole, 224 ratchet,

230, A pawl, 231 pin,

240 Output member, 241 shoulder, 242 accommodation space, 243 axial hole, 244 radial hole, 245 blind hole, 246 pin, 247 second elastic element, 248 output end;

250 reversing element, 251 shift shaft, 252 first elastic element, 253 pushing element, 254 knob,

A retainer ring 260 is arranged on the inner side of the sleeve,

The gasket is provided with a 270. The gasket,

And central angles corresponding to the two idle ratchets on the alpha ratchet wheel.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The terms "comprises" and "comprising" and any variations thereof, in the description and claims, are intended to cover a non-exclusive inclusion, such as a method or article, that comprises a list of features does not necessarily limit the features to those expressly listed, but may include other features not expressly listed that may be included in such method or article.

In the description of the present utility model, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "front", "rear", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Wherein "up" and "down", "front" and "rear" are in opposite directions.

In the description of the present utility model, it should be understood that the technical features defined by the terms "first", "second", etc. having sequential concepts are merely for the purpose of clearly describing the defined technical features, so that the defined technical features can be clearly distinguished from other technical features, and are not so named as to represent actual implementation, and thus should not be construed as limiting the present utility model.

The present utility model will be described in detail with reference to specific embodiments and drawings.

As shown in fig. 1-2, the ratchet wrench includes a handle 100 and a head 200.

Handle 100 includes a first housing 180, a second housing 190, a power take off, and a tail cap 150. The first housing 180 and the second housing 190 are assembled together by fasteners and form an assembly cavity therebetween. The power take-off is located within the assembly cavity and within the entire shank. The power output device comprises a battery 140, a motor 130, a speed reducing device 120, an eccentric shaft 110 and a switch control 170, wherein the speed reducing device 120 is positioned between the motor 130 and the eccentric shaft 110 and used for reducing the rotation of the motor and then transmitting the rotation to the eccentric shaft 110, and the eccentric shaft 110 is positioned at the front end of the handle 100. Tail cap 150 may be removed to replace the battery. Depressing the switch control 170 may activate the motor. A light bulb 160 is provided at the front end of the handle 100 for illumination to facilitate coupling of the ratchet wrench to a workpiece.

As shown in fig. 5-6, the head 200 includes a body member 210, a ratchet 220, a pawl 230, and an output member 240.

The rear end of the body member 210 is sleeve-like as shown in fig. 2-3 and fits over the front end of the shank 100 such that the eccentric shaft 110 extends forwardly within the body member 210 as shown in fig. 9. The body member 210 is assembled to the handle 100 by fasteners, which fixedly connect the body member to the handle as a unit.

As shown in fig. 8-10, the ratchet 220 is maintained in one-way driving engagement with the eccentric shaft 110 by an eccentric axial ratchet. Specifically, as shown in fig. 4 to 5, the ratchet 220 is provided with a shaft groove 221 at the rear end, a shaft section 222 is disposed in the shaft groove 221, and the axial directions of the shaft groove 221 and the shaft section 222 are in the up-down direction in fig. 6 to 7. The shaft section 222 is provided with a shaft hole 223, and the axial direction of the shaft hole 223 is in the front-rear direction. Thus, the axial direction of the shaft section 222 is perpendicular to the axial direction of the shaft hole 223. The eccentric shaft 110 is assembled with the shaft hole 223. Accordingly, when the eccentric shaft 110 rotates, the shaft section 222 rotates, and the shaft section 222 moves (slides) up and down in the shaft groove 221, and the rotation of the ratchet 220 is disposed on the body member 210, so that the circular motion of the eccentric shaft 110 is converted into the swing of the ratchet 220. On the contrary, in view of the cooperation between the speed reducer 120 and the ratchet 220 and the eccentric shaft 110, the torque from the ratchet 220 cannot drive the eccentric shaft 110 to rotate, so when the motor 130 does not rotate, the eccentric shaft 110 and the ratchet 220 are kept in a relatively static state and are locked, and at this time, the ratchet 220 can be rotated by rotating the handle 100, so that the ratchet wrench is in a manual mode to apply the torque from the handle to the workpiece.

According to the above structure, the ratchet wrench electric mode and the manual mode are given: in the electric mode, the power output device outputs torque, the eccentric shaft 110 drives the ratchet 220 to swing, and the torque output by the power output device is intermittently transmitted to the output member 240 through the pawl 230; in the manual mode, the power take off does not output torque, and torque from the handle is intermittently transferred to the output member 240 via the pawl 230 by the handle 100 swinging with the ratchet 220.

The front portion of the body member 210 has first and second walls 211 and 212 opposite each other up and down as shown in fig. 6 to 8, the first wall 211 having a first shaft hole 213, and the second wall 212 having a second shaft hole 214, the first shaft hole 213 being coaxial with the second shaft hole 214. The output member 240 is rotatably fitted to the first shaft hole 213 and the second shaft hole 214 as if the ratchet 220 is located between the first wall 211 and the second wall 212 and is fitted over the output member 240, and the pawl 230 is located between the ratchet 220 and the output member 240. The ratchet 220 and the output member 240 are coaxially disposed with respect to the body member 210.

In particular, the output member 240 has an accommodation space 242 between the shoulders 241, and the pawl 230 is located in the accommodation space 242 and is fitted to the shoulders 241 by the pin shaft 231. Accordingly, the space between the output member and the ratchet wheel can be fully utilized, and the blank area outside the section line area in fig. 9 rarely provides the situation of fully utilizing the space, thereby avoiding the overlarge head volume.

The output member 240 has a through axial hole 243 and a radial hole 244, the axial hole 243 accommodates a shift shaft 251, and a pushing piece 253 that is elastically biased in the radial direction by the first elastic element 252 is disposed on the shift shaft 251, and the pushing piece 253 protrudes from the radial hole 244 and abuts against the pawl 230. The outer end of the gear shaft 251 is provided with a knob 254. The gear shaft 251 and the knob 254 are integrally formed to form a reversing member 250. Moreover, since the pushing member 253 protrudes from the radial hole 244 and abuts against the pawl 230, the pushing member 253 blocks the gear shaft 251 from coming out of the axial hole 243.

Output member 240 is axially constrained to body member 210 by a collar 260 that snaps onto body member 210. To avoid friction, and eliminate the assembly gap, washers 270 are provided at both ends of the output member.

The output member 240 is provided with a blind hole 245, an elastic assembly is assembled in the blind hole 245, the elastic assembly comprises a marble 246 and a second elastic element 247, the marble 246 and the second elastic element 247 are arranged in the blind hole 245, and the marble 246 is supported on a facing gasket 270 by the elastic force of the second elastic element 247. The elastic component is elastically supported on the gasket and the output component in the axial direction.

In the illustrated structure, the portion of the gasket corresponding to the pins is planar, and the pins move smoothly over the gasket. In other embodiments, the portion of the gasket corresponding to the pins may also be a ring groove.

The number of pawls 230 is 2, one of which is engaged with the ratchet 220 and the other of which is engaged with the ratchet by an angle of alpha/2, where alpha is the corresponding central angle of two adjacent ratchet teeth on the ratchet. In the illustrated structure, the ratchet has 42 ratchets, alpha is about 8.571 degrees, so in fig. 9, the left pawl is just meshed with the ratchet, and at the moment, the ratchet is rotated clockwise by alpha/2 is about 4.286 degrees, so that the right pawl is just meshed with the ratchet, and the effect that the ratchet has 84 ratchets is achieved. Broadly, the pawls include n, where n is 2 or 3, and one of the pawls is engaged with the ratchet wheel, and one of the remaining pawls is engaged with the ratchet wheel by an angle α/n, where α is the corresponding central angle of two adjacent ratchet teeth on the ratchet wheel. In other embodiments, the pawls may be arranged in pairs, i.e., one pair of pawls engages the ratchet while the remaining pairs of pawls engage the ratchet by an angle of α/n.

According to the structural description, the workpiece is quickly screwed through the electric mode when the workpiece screwing device is used, the workpiece is screwed through the manual mode with larger torsion, the torsion is easy to control according to needs when the torsion is manually applied, and the excessive torsion damage to the workpiece is avoided.

In the state shown in fig. 9, in the electric mode, the ratchet 220 swings clockwise, and the pawl 230 slips on the ratchet 220. The ratchet 220 swings in a counterclockwise direction, and the ratchet 220 rotates the output torque in a counterclockwise direction by pushing the output member 240 via the pawl 230. With the rotation of the motor, the eccentric shaft 110 rotates one revolution, and the ratchet 220 completes one swing. The magnitude of the swing amplitude (angle) of the ratchet 220 depends on the eccentricity of the eccentric shaft 110, the eccentricity is large, the swing amplitude (angle) of the ratchet is large, the eccentricity is small, and the swing amplitude (angle) of the ratchet is small. Further, since the rear ends of the eccentric shaft and the ratchet are both within the outline of the main body member, the output end 248 of the output member can be made to intermittently output torque even if the lever is kept stationary in the electric mode.

In the manual mode, in the state shown in fig. 9, the handle 100 swings clockwise with the ratchet 220, the pawl 230 slides on the ratchet 220, the handle 100 swings counterclockwise with the ratchet 220, and the ratchet 220 rotates counterclockwise with the output member 240 pushed by the pawl 230 to output torque.

When it is desired to change the direction of the applied torque force, the reversing member 250 is rotated in a counterclockwise direction from the state shown in fig. 9, causing the pushing piece 253 to also rotate in a counterclockwise direction, and finally forcing the pawl 230 to rotate in a clockwise direction, the ratchet wrench can be switched to the electric mode or the manual mode, and the clockwise torque force is intermittently output through the output end 248 of the output member.

Claims (12)

1. Electric and manual dual-purpose ratchet spanner, characterized by includes:

A handle (100) which is internally provided with a power output device, wherein the power output device is provided with an eccentric shaft (110) positioned at the front end of the handle;

The head (200) comprises a body member (210), a ratchet wheel (220), a pawl (230) and an output member (240), wherein the body member (210) is fixedly assembled at the front end of the handle (100), the ratchet wheel (220) is matched with the eccentric shaft (110) through unidirectional driving of the eccentric axial ratchet wheel to endow a ratchet wrench with an electric mode and a manual mode, the power output device outputs torque in the electric mode, the eccentric shaft (110) drives the ratchet wheel (220) to swing so as to intermittently transmit the torque output by the power output device to the output member (240) through the pawl (230), the power output device does not output torque in the manual mode, and the handle (100) drives the ratchet wheel (220) to swing so as to intermittently transmit the torque from the handle to the output member (240) through the pawl (230).

2. The dual-purpose electric and manual ratchet wrench of claim 1, wherein: the rear end of the ratchet wheel (220) is provided with an axle groove (221), an axle section (222) is arranged in the axle groove (221), the axle section (222) is provided with an axle hole (223), the axial direction of the axle section (222) is perpendicular to the axial direction of the axle hole (223), and the eccentric shaft (110) is assembled with the axle hole (223).

3. The dual-purpose electric and manual ratchet wrench according to claim 1 or 2, wherein: the power output device comprises a motor (130) and a speed reduction device (140), and the speed reduction device (140) is positioned between the motor (130) and the eccentric shaft (110) and is used for reducing the rotation of the motor and then transmitting the rotation to the eccentric shaft.

4. The dual-purpose electric and manual ratchet wrench of claim 1, wherein: the ratchet (220) and the output member (240) are coaxially arranged to the body member (210).

5. The dual-purpose electric and manual ratchet wrench of claim 4, wherein: the body member (210) has opposite first and second walls (211, 212), the first wall (211) has a first shaft hole (213), the second wall (212) has a second shaft hole) 214, the first shaft hole (213) is coaxial with the second shaft hole (214), the output member (240) is rotatably assembled in the first shaft hole (213) and the second shaft hole (214), the ratchet (220) is located between the first wall (211) and the second wall (212) and sleeved outside the output member (240), and the pawl (230) is located between the ratchet (220) and the output member (240).

6. The dual-purpose electric and manual ratchet wrench of claim 5, wherein: the output member (240) has an accommodation space (242) between the shoulders (241), and the pawl (230) is located in the accommodation space (242) and fitted to the shoulders (241) through the shaft (231).

7. The dual-purpose electric and manual ratchet wrench of any one of claims 4-6, wherein: the output member (240) has a through axial hole (243) and a radial hole (244), the axial hole (243) is provided with a gear shaft (251), a pushing piece (253) which is elastically applied to the radial direction by a first elastic element (252) is arranged on the gear shaft (251), the pushing piece (253) extends out of the radial hole (244) and is abutted against the pawl (230), and a knob (254) is arranged at the outer end of the gear shaft (251).

8. The dual-purpose electric and manual ratchet wrench of any one of claims 4-6, wherein: the output member (240) is axially constrained to the body member (210) by a collar (260).

9. The dual-purpose electric and manual ratchet wrench of any one of claims 4-6, wherein: a washer 270 is disposed at one end of the output member 240, and an elastic unit is disposed on the output member 240 and is elastically supported by the washer 270 and the output member 240 in the axial direction.

10. The dual-purpose electric and manual ratchet wrench of claim 9, wherein: the elastic component comprises a marble (246) and a second elastic element (247), a blind hole (245) is arranged in the output member (240), the marble (246) and the second elastic element (247) are arranged in the blind hole (245), and the marble (246) is supported on the gasket (270) by the elastic force of the second elastic element (247).

11. The dual-purpose electric and manual ratchet wrench of claim 10, wherein: the gasket (270) is provided with a plane or a ring groove at a position corresponding to the marble (246).

12. The dual-purpose electric and manual ratchet wrench of any one of claims 1-2 and 4-6, wherein: the pawl (230) includes n, n being 2 or 3, wherein when one pawl is engaged with the ratchet wheel, one of the remaining pawls is engaged with the ratchet wheel by an angle of alpha/n, wherein alpha is the corresponding central angle of two adjacent ratchet teeth on the ratchet wheel.