CN216830624U

CN216830624U - Ratchet wrench

Info

Publication number: CN216830624U
Application number: CN202123431002.0U
Authority: CN
Inventors: 刘宁
Original assignee: Jiangsu Dongcheng Tools Technology Co Ltd
Current assignee: Jiangsu Dongcheng Tools Technology Co Ltd
Priority date: 2021-12-30
Filing date: 2021-12-30
Publication date: 2022-06-28
Anticipated expiration: 2031-12-30

Abstract

A ratchet wrench comprises a head shell, a motor located in the head shell, a transmission mechanism connected to the motor and a driving mechanism driven by the transmission mechanism, wherein the motor drives the driving mechanism to rotate longitudinally through the transmission mechanism. The clutch mechanism comprises an inner gear ring, a clutch piece and an elastic piece which are sequentially arranged along the longitudinal direction, the inner gear ring is sleeved on the periphery of the transmission mechanism and is provided with a boss which protrudes forwards from the front end face, the clutch piece abuts against the front end face of the inner gear ring, one end of the elastic piece is connected to the clutch piece, and the other end of the elastic piece abuts against the inner wall of the head shell part. When the driving mechanism works normally, the clutch piece is abutted against the boss, the inner gear ring does not rotate at the moment, and the ratchet wrench outputs normally; when the driving mechanism is locked, the boss of the inner gear ring passes over the clutch piece, so that the inner gear ring rotates relatively, and the clutch function is realized. Therefore, the ratchet wrench does not have the phenomenon of 'throwing hands', so that the risk of injury to the hands of a user is avoided.

Description

Ratchet wrench

[ technical field ]

The utility model relates to a spanner instrument technical field, in particular to ratchet spanner with clutching mechanism.

[ background art ]

An electric ratchet wrench is a tool for automatically tightening and loosening bolts through the operation of a motor, and is often used for tightening and loosening high-strength bolts. When an electric ratchet wrench in the current market screws a bolt, the machine is stopped by means of the locked-rotor of a motor and overcurrent protection; however, at the moment of overcurrent protection stalling, due to the action of inertia force, the output end stalling usually occurs, but the machine body (especially the hand holding position) still rotates forwards for a certain angle, namely, the phenomenon of 'hands swinging' occurs. Meanwhile, the larger the torque of the ratchet wrench is, the more obvious the phenomenon of 'hand throwing' is, which not only affects the use experience of users, but also is likely to cause personal injury to users because the ratchet wrench is often used in narrow spaces.

Accordingly, there is a need for an improved ratchet wrench that overcomes the deficiencies of the prior art.

[ contents of utility model ]

To the deficiency of the prior art, an object of the utility model is to provide a clutching mechanism's ratchet spanner, this clutching mechanism realize output shaft and drive mechanism's separation and reunion when stalling.

The utility model provides a technical scheme that prior art problem adopted is: a ratchet wrench comprises a head shell, a motor positioned in the head shell, a transmission mechanism connected with the motor, a driving mechanism driven by the transmission mechanism and a ratchet mechanism connected to the front end of the driving mechanism. The motor drives the driving mechanism to rotate around the longitudinal direction through the transmission mechanism, and the ratchet mechanism converts the rotation of the driving mechanism into vertical rotation perpendicular to the longitudinal direction. The ratchet wrench comprises a clutch mechanism located in the head shell, the clutch mechanism comprises an inner gear ring, a clutch piece and an elastic piece which are sequentially arranged along the longitudinal direction, the inner gear ring is sleeved on the periphery of the transmission mechanism and provided with a boss protruding forwards from the front end face, the clutch piece abuts against the front end face of the inner gear ring, and one end of the elastic piece is connected to the clutch piece and the other end of the elastic piece abuts against the inner wall of the head shell. When the driving mechanism works normally, the clutch piece is abutted against the boss, and when the driving mechanism is locked, the boss of the inner gear ring passes over the clutch piece, so that the inner gear ring rotates relatively.

The further improvement scheme is as follows: the elastic part is a plurality of springs distributed along the circumferential direction, the clutch part is a plurality of ball head pins connected to the longitudinal rear ends of the springs, and the number of the bosses corresponds to the number of the ball head pins.

The further improvement scheme is as follows: the elastic part is a single clutch spring sleeved on the periphery of the driving mechanism, the clutch part is a clutch sleeve which is positioned between the elastic part and the inner gear ring and is circumferentially fixed, the clutch sleeve is provided with a plurality of bulges protruding backwards from the rear end face, and the bulges and the bosses are arranged in a staggered manner.

The further improvement scheme is as follows: the driving mechanism is provided with an output shaft connected to the front end of the transmission mechanism and an eccentric pin extending forwards from the front end of the output shaft, the eccentric pin is offset from the axis of the output shaft by a certain distance, and when the output shaft rotates around a longitudinal axis, the eccentric pin makes circular motion around the longitudinal axis.

The further improvement scheme is as follows: the ratchet mechanism comprises a clutch fork positioned at the front end of the driving mechanism and a ratchet assembly positioned in the clutch fork, the clutch fork is provided with a concave part positioned at the rear end, the eccentric pin is positioned in the concave part, and when the eccentric pin does circular motion around a longitudinal axis, the clutch fork is driven to do reciprocating motion in a transverse direction perpendicular to the longitudinal direction.

The further improvement scheme is as follows: the separation and reunion fork is equipped with along vertical centre bore that runs through and is located internal tooth on the inner wall of centre bore, the ratchet subassembly is equipped with and is located ratchet main part in the centre bore, certainly the drive head of ratchet main part along vertical extension and being located pawl on the lateral wall of ratchet main part, the pawl meshing in the internal tooth, so that separation and reunion fork is in horizontal reciprocating motion and turns into the drive head is around vertical rotary motion.

The further improvement scheme is as follows: the motor is provided with a motor shaft extending along the longitudinal direction, the motor shaft extends into the transmission mechanism, and the output shaft is fixedly connected to the longitudinal front end of the transmission mechanism.

The further improvement scheme is as follows: the motor shaft of the motor has the same rotational axis as the output shaft of the drive mechanism.

The further improvement scheme is as follows: the ratchet wrench comprises a shell extending along the longitudinal direction and a battery pack located in the shell, the shell is provided with a main body portion wrapping the rear end of the head shell portion and a holding portion located at the rear end of the main body portion, and the battery pack is located in the holding portion.

The further improvement scheme is as follows: the ratchet wrench is further provided with a control circuit board located between the motor and the battery pack and a control switch connected to the control circuit board, and the control switch is partially exposed out of the shell.

Compared with the prior art, the utility model discloses following beneficial effect has: the clutch mechanism comprises an inner gear ring, a clutch piece and an elastic piece which are sequentially arranged from back to front along the longitudinal direction, the inner gear ring is sleeved on the periphery of the transmission mechanism and is provided with a boss protruding forwards from the front end face, the clutch piece abuts against the front end face of the inner gear ring, one end of the elastic piece is connected to the clutch piece, and the other end of the elastic piece abuts against the inner wall of the head shell portion. When the driving mechanism works normally, the clutch piece is abutted against the boss, the inner gear ring does not rotate at the moment, and the ratchet wrench realizes normal output; when the driving mechanism is locked, the boss of the inner gear ring passes over the clutch piece, so that the inner gear ring rotates relatively, and the clutch function is realized. Therefore, the ratchet wrench cannot generate the phenomenon of 'hand throwing', so that the use experience of a user is improved, and the risk of injury to the hand of the user is avoided.

[ description of the drawings ]

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings:

FIG. 1 is a front view of a ratchet wrench in accordance with a preferred embodiment of the present invention;

FIG. 2 is a cross-sectional view of the ratchet wrench of FIG. 1;

FIG. 3 is a front view of the head housing portion of the ratchet wrench of FIG. 1;

FIG. 4 is a cross-sectional view of the head housing portion shown in FIG. 3;

FIG. 5 is an exploded schematic view of the head housing portion shown in FIG. 3;

fig. 6 is an exploded schematic view of the clutch mechanism and drive mechanism in the head housing portion shown in fig. 5.

The meaning of the reference symbols in the figures:

100. ratchet wrench 101, head case part 10, case 11, main body part 12, grip part 13, control switch 20, motor 30, transmission mechanism 40, clutch mechanism 41, ring gear 410, boss 42, elastic member 43, clutch member 50, drive mechanism 51, output shaft 511, eccentric pin 512, bush 52, bearing 60, ratchet mechanism 61, clutch fork 611, internal teeth 612, recess 62, ratchet assembly 621, ratchet main body 622, drive head 623, pawl 70, battery pack 80, control circuit board

[ detailed description of the invention ]

The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Words such as "upper," "lower," "front," "rear," and the like, which indicate orientation or positional relationships, are used solely to facilitate the description of the invention and to simplify the description, and do not indicate or imply that the referenced devices/elements must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention.

Referring to fig. 1 to 6, a ratchet wrench 100 according to a preferred embodiment of the present invention is shown, which is commonly used for automatic tightening and loosening of bolts. The ratchet wrench 100 includes a head housing 101 and a housing 10 extending in a longitudinal direction. The housing 10 is provided with a main body 11 covering the rear end of the head housing 101 and a grip 12 located at the rear end of the main body 11, and the grip 12 is held by a user.

Referring to fig. 2, the ratchet wrench 100 is provided with a battery pack 70 disposed in the housing 10 and a control circuit board 80 disposed between the motor 20 and the battery pack 70, and specifically, the battery pack 70 is inserted from the rear end of the housing 10 and partially disposed in the grip 12 for supplying power to the ratchet wrench 100. The ratchet wrench 100 is further provided with a control switch 13 connected to the control circuit board 80, and the control switch 13 is partially exposed outside the housing 10 for a user to operate to control the start and stop of the ratchet wrench 100.

Referring to fig. 3 to 5, the ratchet wrench 100 includes a motor 20, a transmission mechanism 30, a clutch mechanism 40, a driving mechanism 50 and a ratchet mechanism 60 disposed in a head housing 101. The motor 20 is provided with a motor shaft (not numbered) extending along the longitudinal direction, and the transmission mechanism 30 is a planetary gear train mechanism and is connected to the motor 20, i.e. the motor shaft extends into the transmission mechanism 30.

The output shaft 51 of the driving mechanism 50 is fixedly connected to the front end of the transmission mechanism 30 in the longitudinal direction and is driven by the transmission mechanism 30, the motor 20 drives the driving mechanism 50 to rotate around the longitudinal direction through the transmission mechanism 30, and the motor shaft of the motor 20 and the output shaft 51 of the driving mechanism 50 have the same rotation axis. The ratchet mechanism 60 is connected to the front end of the drive mechanism 50, and converts the rotation of the drive mechanism 50 into vertical rotation perpendicular to the longitudinal direction.

Specifically, the driving mechanism 50 is provided with an output shaft 51 connected to the front end of the transmission mechanism 30 and a bearing 52 sleeved on the outer circumference of the output shaft 51, and the bearing 52 is used for axially fixing the output shaft 51 in the head housing part 101. The output shaft 51 is provided with an eccentric pin 511 extending forwards from the front end and a bushing 512 sleeved on the periphery of the eccentric pin 511; the eccentric pin 511 is offset from the axis of the output shaft 51 by a certain distance, and when the output shaft 51 rotates around the longitudinal axis, the eccentric pin 511 makes a circular motion around the longitudinal axis.

The ratchet mechanism 60 includes a clutch fork 61 at the front end of the driving mechanism 50 and a ratchet assembly 62 located in the clutch fork 61. The clutch fork 61 is provided with a central hole (not numbered) which vertically penetrates through the clutch fork, internal teeth 611 positioned on the inner wall of the central hole and a concave part 612 positioned at the rear end, and the ratchet assembly 62 is accommodated in the central hole. The eccentric pin 511 is accommodated in the recess 612 through a bushing 512, and drives the clutch fork 61 to reciprocate in a transverse direction perpendicular to the longitudinal direction when the eccentric pin 511 makes a circular motion around the longitudinal axis.

The ratchet assembly 62 is provided with a ratchet body 621 located in the central hole, a driving head 622 vertically extending from the ratchet body 621, and a pawl 623 located on the side wall of the ratchet body 621, wherein the pawl 623 is engaged with the internal teeth 611, so that the reciprocating motion of the clutch fork 61 in the transverse direction is converted into the rotating motion of the driving head 622 around the vertical direction.

As shown in fig. 6, the clutch mechanism 40 includes a ring gear 41, a clutch member 43 and an elastic member 42 that are sequentially arranged from back to front along the longitudinal direction, the ring gear 41 is sleeved on the periphery of the transmission mechanism 30 and is provided with a boss 410 that protrudes forward from the front end surface, the clutch member 43 abuts against the front end surface of the ring gear 41, one end of the elastic member 42 is connected to the clutch member 43, and the other end abuts against the inner wall of the head housing portion 101.

When the driving mechanism 50 works normally, the clutch piece 43 abuts against the boss 410, at this time, the ring gear does not rotate, and the ratchet wrench 100 realizes normal output; when the driving mechanism 50 is locked, the boss 410 of the ring gear 41 passes over the clutch member 43, so that the ring gear 41 relatively rotates, thereby realizing a clutch function. Therefore, the ratchet wrench 100 does not have the phenomenon of 'hands getting out', so that the use experience of the user is improved, and the risk of injury to the hand of the user is avoided. In this embodiment, the elastic members 42 are a plurality of springs uniformly distributed along the circumferential direction, the clutch member 43 is a plurality of ball studs connected to the rear ends of the plurality of springs in the longitudinal direction, and the number of the bosses 410 corresponds to the number of the ball studs.

In other embodiments, the elastic member 42 is a single clutch spring sleeved on the periphery of the driving mechanism 50, and the clutch member 43 is a clutch sleeve located between the elastic member 42 and the ring gear 41 and fixed in the circumferential direction, that is, the clutch sleeve can only move in the axial direction and cannot rotate. The clutch sleeve is provided with a plurality of bulges which protrude backwards from the back end surface, and the bulges and the bosses 410 are arranged in a staggered way. When the driving mechanism 50 is locked, the boss 410 of the inner gear ring 41 and the protruding position of the clutch sleeve rotate in a staggered manner, at this time, the clutch sleeve reciprocates along the longitudinal direction, the inner gear ring 41 rotates relatively, at this time, the transmission mechanism 30 has no output, that is, the output shaft 51 has no output, and therefore the clutch function is realized. Therefore, the ratchet wrench 100 does not have the phenomenon of 'hands getting out', so that the use experience of the user is improved, and the risk of injury to the hand of the user is avoided.

The utility model discloses in, ratchet wrench 100 is including being located the clutching mechanism 40 of head shell portion 101, clutching mechanism 40 includes ring gear 41, clutch 43 and the elastic component 42 of arranging forward from vertical back in proper order along following, the periphery that drive mechanism 30 was located to ring gear 41 cover just is equipped with the boss 410 of stretching forward from the preceding terminal surface, clutch 43 butt is in the preceding terminal surface of ring gear 41, the one end of elastic component 42 is connected in clutch 43 and other end butt in the inner wall of head shell portion 101. When the driving mechanism 50 works normally, the clutch piece 43 abuts against the boss 410, at this time, the ring gear 41 does not rotate, and the ratchet wrench 100 realizes normal output; when the driving mechanism 50 is locked, the boss 410 of the ring gear 41 passes over the clutch member 43, so that the ring gear 41 relatively rotates, thereby realizing a clutch function. Therefore, the ratchet wrench 100 does not have the phenomenon of 'hands getting out', so that the use experience of the user is improved, and the risk of injury to the hand of the user is avoided.

The present invention is not limited to the above-described embodiments. It will be readily appreciated by those skilled in the art that many alternatives to the ratchet wrench are possible without departing from the spirit and scope of the present invention. The protection scope of the present invention is subject to the content of the claims.

Claims

1. A ratchet wrench comprises a head shell, a motor positioned in the head shell, a transmission mechanism connected with the motor, a driving mechanism driven by the transmission mechanism and a ratchet mechanism connected to the front end of the driving mechanism, wherein the motor drives the driving mechanism to rotate around the longitudinal direction through the transmission mechanism, and the ratchet mechanism converts the rotation of the driving mechanism into vertical rotation perpendicular to the longitudinal direction; the method is characterized in that: the ratchet wrench comprises a clutch mechanism positioned in the head shell part, the clutch mechanism comprises an inner gear ring, a clutch piece and an elastic piece which are sequentially arranged along the longitudinal direction, the inner gear ring is sleeved on the periphery of the transmission mechanism and is provided with a boss protruding forwards from the front end face, the clutch piece abuts against the front end face of the inner gear ring, one end of the elastic piece is connected to the clutch piece, and the other end of the elastic piece abuts against the inner wall of the head shell part; when the driving mechanism works normally, the clutch piece abuts against the boss, and when the driving mechanism is locked, the boss of the inner gear ring passes over the clutch piece, so that the inner gear ring rotates relatively.

2. The ratchet wrench of claim 1, wherein: the elastic part is a plurality of springs distributed along the circumferential direction, the clutch part is a plurality of ball head pins connected to the longitudinal rear ends of the springs, and the number of the bosses corresponds to the number of the ball head pins.

3. The ratchet wrench of claim 1, wherein: the elastic part is a single clutch spring sleeved on the periphery of the driving mechanism, the clutch part is a clutch sleeve which is positioned between the elastic part and the inner gear ring and is circumferentially fixed, the clutch sleeve is provided with a plurality of bulges protruding backwards from the rear end face, and the bulges and the bosses are arranged in a staggered manner.

4. The ratchet wrench of claim 1, wherein: the driving mechanism is provided with an output shaft connected to the front end of the transmission mechanism and an eccentric pin extending forwards from the front end of the output shaft, the eccentric pin is offset from the axis of the output shaft by a certain distance, and when the output shaft rotates around a longitudinal axis, the eccentric pin makes circular motion around the longitudinal axis.

5. The ratchet wrench of claim 4, wherein: the ratchet mechanism comprises a clutch fork positioned at the front end of the driving mechanism and a ratchet assembly positioned in the clutch fork, the clutch fork is provided with a concave part positioned at the rear end, the eccentric pin is positioned in the concave part, and when the eccentric pin does circular motion around a longitudinal axis, the clutch fork is driven to do reciprocating motion in a transverse direction perpendicular to the longitudinal direction.

6. The ratchet wrench of claim 5, wherein: the separation and reunion fork is equipped with along vertical centre bore that runs through and is located internal tooth on the inner wall of centre bore, the ratchet subassembly is equipped with and is located ratchet main part in the centre bore, certainly the drive head of ratchet main part along vertical extension and being located pawl on the lateral wall of ratchet main part, the pawl meshing in the internal tooth, so that separation and reunion fork is in horizontal reciprocating motion and turns into the drive head is around vertical rotary motion.

7. The ratchet wrench of claim 4, wherein: the motor is provided with a motor shaft extending along the longitudinal direction, the motor shaft extends into the transmission mechanism, and the output shaft is fixedly connected to the longitudinal front end of the transmission mechanism.

8. The ratchet wrench of claim 7, wherein: the motor shaft of the motor and the output shaft of the drive mechanism have the same axis of rotation.

9. The ratchet wrench of claim 1, wherein: the ratchet wrench comprises a shell extending along the longitudinal direction and a battery pack located in the shell, the shell is provided with a main body portion wrapping the rear end of the head shell portion and a holding portion located at the rear end of the main body portion, and the battery pack is located in the holding portion.

10. The ratchet wrench of claim 9, wherein: the ratchet wrench is further provided with a control circuit board located between the motor and the battery pack and a control switch connected to the control circuit board, and the control switch is partially exposed out of the shell.