CN214025536U

CN214025536U - Electric hammer

Info

Publication number: CN214025536U
Application number: CN202022480548.4U
Authority: CN
Inventors: 侯维平
Original assignee: Jiangsu Dongcheng Tools Technology Co Ltd
Current assignee: Jiangsu Dongcheng Tools Technology Co Ltd
Priority date: 2020-10-30
Filing date: 2020-10-30
Publication date: 2021-08-24
Anticipated expiration: 2030-10-30

Abstract

The utility model discloses an electric hammer, which comprises a clutch element and a rotating gear which are arranged in a casing; the clutch element is provided with a plurality of latches, outer side walls are formed on two sides of the latches, the rotary gear is provided with a groove for accommodating the latches, inner side walls are formed on two sides in the groove, the rotary gear and the clutch element have a forward rotation tripping state and a reverse rotation tripping state, and the connecting line distance between the outer side wall and the inner side wall contact point and the disengaging point of the forward rotation tripping state is smaller than the connecting line distance between the outer side wall and the inner side wall contact point and the disengaging point of the reverse rotation tripping state; the tripping force for forward rotation of the electric hammer is larger than the tripping force for reverse rotation of the electric hammer.

Description

Electric hammer

[ technical field ]

The utility model relates to an electric tool field, in particular to electric hammer that is used for drilling or chiseling on concrete, floor, brick wall and stone material.

[ background art ]

When the electric hammer works in a chiseling mode, the electric hammer often encounters a wall body with reinforcing steel bars, a drill bit rotating forward is clamped in the moment when encountering the reinforcing steel bars, an operator feels huge reverse torque of the electric hammer in the moment, and the operator at the moment is easily sprained by the electric hammer. In order to prevent the injury phenomenon, most of the existing electric hammers are provided with a clutch assembly, when a drill bit rotating forwards is stuck, the clutch assembly enables the motor drive of the electric hammer to be separated from the drill bit movement, at the moment, the motor is in an idle running state, and an operator only feels small reverse torque of the electric hammer. When an operator needs to take off the drill bit, the electric hammer needs to be reversely rotated, the operator is in a non-working state, the sudden reverse rotation still causes difficulty in holding the electric hammer, although the existing clutch assembly is provided with the clutch, a larger torque force is transmitted to the operator, and therefore the market lacks of the electric hammer which can provide a more sensitive clutch during reverse rotation.

[ contents of utility model ]

In order to solve the problem, the utility model provides an electric hammer which can be clutched by positive and negative rotation.

In order to solve the technical problem, the utility model adopts the following technical scheme: an electric hammer comprises a machine shell, wherein a motor, an intermediate shaft driven by the motor, and an impact system and a rotating system driven by the intermediate shaft are accommodated in the machine shell; the rotating system comprises a cylinder sleeve and a clutch assembly sleeved on the cylinder sleeve; the clutch component is provided with a clutch element, a rotating gear abutted against the clutch element and a biasing element abutted against the rotating gear or the clutch element; the clutch element co-rotates with the cylinder liner; one of the clutch element or the rotary gear is provided with a plurality of latches, outer side walls are formed on two sides of the latches, a groove for accommodating the latches is formed on the other side of the clutch element or the rotary gear, inner side walls are formed on two sides in the groove, the clutch element and the rotary gear are mutually buckled and rotated together or mutually buckled, when the clutch element and the rotary gear are buckled, the bias element is deformed, and the latches are separated from the groove so as to separate the rotary gear and the clutch element; when the rotating gear is tripped from the clutch element, the rotating gear has a forward tripping state and a reverse tripping state, and the distance between the contact points and the disengaging points of the outer side wall and the inner side wall of the forward tripping state is smaller than the distance between the contact points and the disengaging points of the outer side wall and the inner side wall of the reverse tripping state; or the distance of a connecting line between the contact point and the separation point of the outer side wall and the inner side wall in the reverse rotation tripping state is smaller than the distance of a connecting line between the contact point and the separation point of the outer side wall and the inner side wall in the forward rotation tripping state.

The further improvement scheme is as follows: the biasing element is pressed against the rotary gear, and the clutch assembly further comprises a first clamping ring clamped on the left side of the biasing element and a second clamping ring clamped on the right side of the clutch element.

The further improvement scheme is as follows: the biasing element is pressed against the clutch element, and the clutch assembly further comprises a first clamping ring clamped on the left side of the biasing element and a second clamping ring clamped on the right side of the rotary gear.

The further improvement scheme is as follows: the cylinder sleeve is provided with an external spline, and the inner ring of the clutch element is provided with an internal spline engaged with the external spline.

The further improvement scheme is as follows: the intermediate shaft is provided with integrally formed driving teeth, and the driving teeth are meshed with the rotating gear.

The further improvement scheme is as follows: the biasing element is a spring sleeved on the cylinder sleeve.

The further improvement scheme is as follows: the impact system comprises an oscillator, a cylinder, a punch hammer and an impact connecting rod, wherein the oscillator is sleeved on the intermediate shaft and provided with a swing rod for swing output, the cylinder is slidably arranged in the cylinder sleeve and connected to the swing rod, the punch hammer is slidably arranged in the cylinder, the impact connecting rod is slidably arranged in the cylinder sleeve, the oscillator drives the cylinder to reciprocate and compresses air to eject the punch hammer, and the punch hammer impacts the impact connecting rod.

Compared with the prior art the utility model discloses following beneficial effect has: when the rotating gear is tripped from the clutch element, the rotating gear has a forward tripping state and a reverse tripping state, and the distance between the contact points and the disengaging points of the outer side wall and the inner side wall of the forward tripping state is smaller than the distance between the contact points and the disengaging points of the outer side wall and the inner side wall of the reverse tripping state; the electric hammer reverse rotation tripping device is beneficial to enabling the tripping force of the electric hammer forward rotation to be larger than the tripping force of the electric hammer reverse rotation, and the electric hammer reverse rotation tripping device is convenient to clutch and prevent the electric hammer from spraining an operator in the reverse rotation.

[ description of the drawings ]

Fig. 1 is a sectional view of an electric hammer according to a preferred embodiment of the present invention;

FIG. 2 is a perspective view of the clutch assembly and cylinder liner of FIG. 1;

FIG. 3 is a partial cross-sectional view of FIG. 2;

FIG. 4 is an enlarged view of a portion of FIG. 3;

FIG. 5 is an enlarged partial view of the latch of FIG. 4 disengaged from the recess;

fig. 6 is a partially enlarged view of an electric hammer according to a second embodiment of the present invention.

[ detailed description of the invention ]

The following description will further describe embodiments of the present invention with reference to the accompanying drawings and examples.

Referring to fig. 1 to 5, an electric hammer 100 according to a preferred embodiment of the present invention includes a housing 1 and a chuck assembly 7 installed in front of the housing, the housing contains a motor 1, a middle shaft 5 driven by the motor 1, and an impact system and a rotation system driven by the middle shaft 5, the chuck assembly 7 is used for clamping a drill bit, and the impact system and the rotation system transmit impact power and rotation power to the chuck assembly 7, so that the drill bit performs rotary impact output.

The rotating system comprises a cylinder sleeve 6 and a clutch assembly 10 sleeved on the cylinder sleeve 6; the output end of the electric hammer 100 is defined as the left end, and the clutch assembly 10 has a clutch element 12, a second collar 11 clamped on the right side of the clutch element 12, a rotating gear 13 abutted against the clutch element 12, a biasing element 14 abutted against the rotating gear 13, and a first collar 15 clamped on the left side of the biasing element 14. The biasing element 14 in this embodiment is a spring that is sleeved over the cylinder liner 6. The cylinder sleeve 6 is provided with an external spline, an inner ring of the clutch element 12 is provided with an internal spline engaged with the external spline, and the clutch element 12 and the cylinder sleeve 6 rotate together. The intermediate shaft 5 is provided with integrally formed driving teeth 5a, and the driving teeth 5a are meshed with the rotating gear 13.

The clutch element 12 is provided with a plurality of latches, in this embodiment, three latches are adopted, outer side walls are formed on two sides of the latches, the rotary gear 13 is provided with a groove for accommodating the latches, inner side walls are formed on two sides in the groove, and the clutch element 12 and the rotary gear 13 are mutually buckled and rotated together or mutually released. On the contrary, it can also be understood that the rotary gear 13 is provided with several latches, and the clutch element 12 is provided with a groove for receiving the latches.

The clutch element 12 and the rotary gear 13 have a forward rotation tripping state and a reverse rotation tripping state, when the forward rotation tripping state is performed, that is, when the drill bit of the electric hammer 100 is tripped by being clamped in the forward rotation, the rotary gear 13 slides in the axial direction, the biasing element 14 deforms and is compressed and shortened by the rotary gear 13, and the axial direction perpendicular to the output is defined as the up-down direction, as shown in fig. 4 to 5, at this time, the outer side wall of the lower end of the latch and the inner side wall of the groove slide from the contact point to the disengaging point, the latch is separated from the groove, and further, the rotary gear 13 is separated from the clutch element 12, at this time, the intermediate shaft 5 does not provide forward rotation force to the drill bit any more, so as to prevent the operator from being sprained.

When the drill bit is in a reverse tripping state, namely after the drill bit is clamped, an operator reversely rotates the electric hammer 100 to take out the drill bit, when the instant torque for starting the electric hammer 100 is too large, the rotary gear 13 slides in the axial direction, the biasing element 14 deforms and is compressed and shortened by the rotary gear 13, at the moment, the outer side wall of the upper end of the latch and the inner side wall of the groove slide from a contact point to a disengagement point, the latch is separated from the groove, the rotary gear 13 is further separated from the clutch element 12, and at the moment, the intermediate shaft 5 does not provide reverse rotating force for the drill bit any more.

The inclined angle of the upper outer side wall and the lower outer side wall of the latch relative to the axial direction is larger on one side and smaller on the other side, namely the connecting line distance between the contact point and the disengagement point of the outer side wall and the inner side wall in the forward rotation tripping state is not equal to the connecting line distance between the contact point and the disengagement point of the outer side wall and the inner side wall in the reverse rotation tripping state; in this embodiment, the inclination angle of the outer sidewall at the upper end of the latch is greater than the inclination angle of the outer sidewall at the lower end of the latch, that is, the distance between the outer sidewall in the forward rotation tripping state and the contact point and the separation point of the inner sidewall is smaller than the distance between the outer sidewall in the reverse rotation tripping state and the contact point and the separation point of the inner sidewall in the reverse rotation tripping state, so that the tripping force of the forward rotation of the electric hammer 100 is greater than the tripping force of the reverse rotation of the electric hammer 100, and an operator is prevented from being sprained during the reverse rotation.

The impact system of the electric hammer 100 comprises an oscillator 2, a cylinder 3, a punching hammer 8 and an impact connecting rod 4, wherein the oscillator 2 is sleeved on an intermediate shaft 5 and is provided with a swing rod 2a used for swing output, the cylinder 3 is arranged in a cylinder sleeve 6 in a sliding mode and connected with the swing rod 2a, the punching hammer 8 is arranged in the cylinder 3 in a sliding mode, the impact connecting rod 4 is arranged in the cylinder sleeve 6 in a sliding mode, the oscillator 2 drives the cylinder 3 to reciprocate and compress air to eject the punching hammer 8, the punching hammer 8 impacts the impact connecting rod 4, and further the impact connecting rod 4 transmits impact force to a drill bit for impact output.

The biasing element 14 in this embodiment is pressed against the rotating gear 13, but in other embodiments, the biasing element 14 is pressed against the clutch element 12, the first retainer 15 is held on the left side of the biasing element 14, and the second retainer 11 is held on the right side of the rotating gear 13.

Referring to fig. 6, a clutch assembly 10 'according to a second embodiment of the present invention is shown, the clutch assembly 10' according to the second embodiment has substantially the same structure as the clutch assembly 10 according to the first embodiment, and the difference therebetween is: the outer side wall of the upper end of the latch of the clutch element 12' is composed of a plurality of inclined planes, in the embodiment, the outer side wall of the upper end is two inclined planes, the outer side wall of the lower end of the latch is composed of a single inclined plane, and the connecting line distance between the outer side wall in the forward rotation tripping state and the contact point and the disengagement point of the inner side wall is smaller than the connecting line distance between the side wall in the reverse rotation tripping state and the contact point and the disengagement point of the inner side wall, so that the tripping force of the forward rotation of the electric hammer 100 is larger than the tripping force of the reverse rotation of the electric hammer 100.

In the utility model, when the rotary gear 13 and the clutch element 12 are tripped, the device has a forward tripping state and a reverse tripping state, and the distance between the outer side wall and the contact point and the separation point of the inner side wall of the forward tripping state is smaller than the distance between the contact point and the separation point of the inner side wall and the contact point of the inner side wall of the reverse tripping state; the tripping force for forward rotation of the electric hammer 100 is larger than the tripping force for reverse rotation of the electric hammer 100, so that the clutch is more sensitive during reverse rotation, and an operator is prevented from being sprained during reverse rotation of the electric hammer 100.

The present invention is not limited to the above embodiments, and the scope of the present invention is defined by the claims.

Claims

1. An electric hammer comprises a machine shell, wherein a motor, an intermediate shaft driven by the motor, and an impact system and a rotating system driven by the intermediate shaft are accommodated in the machine shell; the rotating system comprises a cylinder sleeve and a clutch assembly sleeved on the cylinder sleeve; the clutch component is provided with a clutch element, a rotating gear abutted against the clutch element and a biasing element abutted against the rotating gear or the clutch element; the clutch element co-rotates with the cylinder liner; one of the clutch element or the rotary gear is provided with a plurality of latches, outer side walls are formed on two sides of the latches, a groove for accommodating the latches is formed on the other side of the clutch element or the rotary gear, inner side walls are formed on two sides in the groove, the clutch element and the rotary gear are mutually buckled and rotated together or mutually buckled, when the clutch element and the rotary gear are buckled, the bias element is deformed, and the latches are separated from the groove so as to separate the rotary gear and the clutch element; the method is characterized in that: when the rotating gear is tripped from the clutch element, the rotating gear has a forward tripping state and a reverse tripping state, and the distance between the contact points and the disengaging points of the outer side wall and the inner side wall of the forward tripping state is smaller than the distance between the contact points and the disengaging points of the outer side wall and the inner side wall of the reverse tripping state; or the distance of a connecting line between the contact point and the separation point of the outer side wall and the inner side wall in the reverse rotation tripping state is smaller than the distance of a connecting line between the contact point and the separation point of the outer side wall and the inner side wall in the forward rotation tripping state.

2. The electric hammer of claim 1, wherein: the biasing element is pressed against the rotary gear, and the clutch assembly further comprises a first clamping ring clamped on the left side of the biasing element and a second clamping ring clamped on the right side of the clutch element.

3. The electric hammer of claim 1, wherein: the biasing element is pressed against the clutch element, and the clutch assembly further comprises a first clamping ring clamped on the left side of the biasing element and a second clamping ring clamped on the right side of the rotary gear.

4. An electric hammer according to any one of claims 1 to 3, wherein: the cylinder sleeve is provided with an external spline, and the inner ring of the clutch element is provided with an internal spline engaged with the external spline.

5. The electric hammer of claim 4, wherein: the intermediate shaft is provided with integrally formed driving teeth, and the driving teeth are meshed with the rotating gear.

6. The electric hammer of claim 5, wherein: the biasing element is a spring sleeved on the cylinder sleeve.

7. The electric hammer of claim 6, wherein: the impact system comprises an oscillator, a cylinder, a punch hammer and an impact connecting rod, wherein the oscillator is sleeved on the intermediate shaft and provided with a swing rod for swing output, the cylinder is slidably arranged in the cylinder sleeve and connected to the swing rod, the punch hammer is slidably arranged in the cylinder, the impact connecting rod is slidably arranged in the cylinder sleeve, the oscillator drives the cylinder to reciprocate and compresses air to eject the punch hammer, and the punch hammer impacts the impact connecting rod.