CN216883813U - Piston and electric hammer - Google Patents

Abstract

A piston relates to the technical field of hardware products, comprising a piston cylinder body, a piston sleeve piece, a connecting rod and a connecting rod pin, wherein the piston sleeve piece is arranged in the piston cylinder body and comprises a rotating assembly and a connecting shaft, the rotating assembly is arranged in the piston cylinder body, the connecting shaft is connected with the rotating assembly, the piston cylinder body can drive the rotating assembly and the connecting shaft to rotate relatively, the connecting rod pin is inserted into the end part of the connecting rod and the connecting shaft, the connecting rod is movably connected with the connecting shaft through the connecting rod pin, when the cylinder rotates, the piston cylinder body rotates along with the cylinder under the action of friction force, namely, a bearing base fixedly connected with the piston cylinder body can rotate relative to a bearing middle base, the bearing middle base is fixedly connected with the connecting shaft, when the connecting rod and the connecting shaft are fixed to rotate, the piston cylinder body and the bearing base are driven by the cylinder to rotate, and the friction force between the cylinder and the piston cylinder body is reduced, the service life of the electric hammer is prolonged. The utility model also provides an electric hammer.

Description

Piston and electric hammer

Technical Field

The utility model relates to the technical field of hardware products, in particular to a piston and an electric hammer.

Background

The electric hammer is an electric rotary hammer drill with a pneumatic hammering mechanism, the electric hammer is a drill bit impacted by compressed gas by utilizing the principle of piston motion, wherein the electric hammer rotates in a working cylinder, the piston linearly reciprocates in the cylinder along with a connecting rod, and the gas in the cylinder is compressed by the reciprocating motion of the piston to generate hammering power.

The piston only does linear reciprocating motion in the cylinder in the prior art, and the piston can not rotate along with the cylinder when the cylinder rotates, and the following technical problems exist in the motion mode: when the piston reciprocates in the cylinder to compress gas, the piston does not rotate because of the cylinder, frictional force between cylinder and the piston has been increased to the piston, causes wearing and tearing in to the cylinder, has reduced the cylinder leakproofness, leads to partial pressure to leak, makes the electric hammer impact force reduce or even do not strike because of pressure is not enough in the cylinder to influence work efficiency, also increaseed the load of motor, reduced the life of electric hammer.

In view of the above technical problems, the prior art provides a corresponding solution, for example, a technical solution provided by the chinese patent application with the application number of 201822225639.6 entitled "new electric hammer piston: the piston body is connected with the clutch sleeve in a rolling contact mode through a ball, one end of the piston body is connected with the swing shaft through a transmission pin, the other end of the piston body is provided with a sealing ring, a groove is formed in the piston body, the ball is arranged in the groove, a fixing piece is arranged on the groove and fixed on the piston body through a bolt, and the inner side face of the fixing piece is an arc face matched with the ball.

However, the above prior art has the following problems: because the ball is connected with the clutch sleeve (cylinder) in a contact way, after the clutch sleeve and the piston relatively operate for a long time, the clutch sleeve is abraded, so that the sealing property is influenced, the pressure is leaked, and the service life of the electric hammer is shortened.

Disclosure of Invention

Accordingly, there is a need for a piston that can move linearly in a reciprocating manner and also rotate with a cylinder.

It is also necessary to provide an electric hammer.

The utility model provides a piston, includes piston barrel, piston external member, connecting rod and connecting rod round pin, the piston external member install in the piston barrel, the piston external member includes runner assembly and connecting axle, runner assembly set up in the piston barrel, the connecting axle with runner assembly connects, the piston barrel rotates and to drive runner assembly with the relative rotation is done to the connecting axle, the connecting rod round pin inserts connecting rod and connecting axle tip, the connecting rod with the connecting axle passes through connecting rod round pin swing joint.

Preferably, the rotating assembly includes bearing base, bearing seat, holder and ball in the bearing base, bearing base outer cylindrical surface with the laminating of piston barrel internal surface fixed, the seat is located in the bearing between the bearing base, just seat both sides face is provided with the ball groove in the bearing, the bearing base is close to the side of seat also is provided with the ball groove in the bearing, the holder is located between seat and the bearing base in the bearing, the ball install in the holder, just the ball surface with the laminating of the ball groove face on the seat is mutually in bearing base and the bearing, the seat is in the bearing can with the bearing base does relative rotation under the effect of ball.

Preferably, the connecting shaft penetrates through the bearing base and is fixedly connected with the bearing middle seat.

Preferably, the bearing base comprises an upper bearing base and a lower bearing base, the upper bearing base is located above the bearing middle seat, the lower bearing base is located below the bearing middle seat, and the lower bottom surface of the lower bearing base is fixedly attached to the inner bottom surface of the piston cylinder.

Preferably, a clamp spring groove is formed in the inner wall of the piston cylinder and located above the upper bearing base, and a clamp spring is further arranged in the clamp spring groove and can clamp the upper bearing base.

Preferably, both ends of the connecting rod are semi-cylindrical and are respectively a first connecting end and a second connecting end, the first connecting end and the second connecting end are respectively provided with a connecting hole, the first connecting end is radially provided with an installation groove, and the installation groove is located at the axial middle position.

Preferably, the end of the connecting shaft is also provided with a connecting hole, the end of the connecting shaft is arranged in the mounting groove, and the connecting rod pin is respectively inserted into the connecting hole at the end of the connecting shaft and the connecting hole at the first connecting end to movably connect the connecting shaft with the connecting rod.

Preferably, the outer wall of the piston cylinder is provided with a sealing groove, and the sealing groove is close to the bottom of the piston cylinder.

Preferably, the bottom in the piston cylinder is also provided with a shaft groove.

The utility model provides an electric hammer, includes electric hammer body, impact part, cylinder actuating mechanism, piston actuating mechanism and main drive spare all set up in this is internal to the electric hammer, the piston is aforementioned piston, main drive spare respectively with cylinder actuating mechanism and piston actuating mechanism connect, cylinder actuating mechanism with the cylinder is connected, impact the part and be located the cylinder front end, the piston install in the cylinder, just the second link of piston connecting rod with piston actuating mechanism connects.

By adopting the technical scheme, the utility model has the beneficial effects that: when the piston does reciprocating linear motion, the piston can do rotary motion along with the cylinder, wherein when the cylinder does rotary motion, the piston cylinder body rotates along with the cylinder under the action of friction force, namely, under the action of balls, a bearing base fixedly connected with the piston cylinder body can rotate relative to a bearing middle seat, the bearing middle seat is fixedly connected with a connecting shaft, and when the connecting rod and the connecting shaft are fixed and do not rotate, the piston cylinder body and the bearing base are driven by the cylinder to rotate;

this scheme is through increasing the piston external member in the piston barrel for rotary motion can be along with the cylinder simultaneously when the piston is reciprocating linear motion, has reduced the frictional force between cylinder and the piston barrel, has avoided the cylinder internal gas pressure to leak, has reduced the load of motor, has increased the life of electric hammer.

Drawings

FIG. 1 is a schematic view of the present invention.

Fig. 2 is a partial cross-sectional view of fig. 1.

Fig. 3 is an exploded view of the present invention.

FIG. 4 is a schematic structural diagram of the connecting rod of the present invention.

Fig. 5 is a schematic structural view of the electric hammer.

In the figure: the piston comprises a piston cylinder body 1, a clamp spring groove 11, a clamp spring 111, a sealing groove 12, a shaft groove 13, a piston kit 2, a rotating assembly 21, a bearing base 211, an upper bearing base 2111, a lower bearing base 2112, a bearing middle seat 212, a ball groove 2121, a retainer 213, a ball 214, a connecting shaft 22, a connecting rod 3, a first connecting end 31, a mounting groove 311, a second connecting end 32, a connecting hole 33, a connecting rod pin 4, an electric hammer body 5, an impact component 6, a cylinder 7, a cylinder driving mechanism 8, a piston driving mechanism 9 and a main driving piece 10.

Detailed Description

Referring to fig. 1 to 5, an embodiment of the present invention provides a piston, which includes a piston cylinder 1, a piston assembly 2, and a connecting rod 3.

Piston external member 2 is installed in piston barrel 1, and piston external member 2 includes runner assembly 21 and connecting axle 22, and runner assembly 21 sets up in piston barrel 1, and connecting axle 22 is connected with runner assembly 21, and piston barrel 1 rotates and to drive runner assembly 21 and connecting axle 22 and do relative rotation, and connecting rod pin 4 inserts connecting rod 3 and connecting axle 22 tip, and connecting rod 3 passes through connecting rod pin 4 swing joint with connecting axle 22.

When the electric hammer works, the cylinder driving mechanism 8 drives the cylinder 7 to do rotary motion, meanwhile, the piston driving mechanism 9 drives the piston to do reciprocating linear motion, namely the piston compresses air in the cylinder 7 in the reciprocating linear motion to form impact force, and hammering is repeatedly carried out on the impact part 6, wherein when the cylinder driving mechanism 8 drives the cylinder 7 to rotate, the piston in the cylinder 7 does reciprocating linear motion under the action of the piston driving mechanism 9 and also does rotary motion along with the cylinder 7, namely the piston cylinder 1 is driven to rotate by the friction force between the inner wall of the cylinder 7 and the outer wall of the piston cylinder 1, and the friction force is converted into usable friction force.

Further, the rotating assembly 21 includes a bearing base 211, a bearing middle seat 212, a retainer 213 and balls 214, an outer cylindrical surface of the bearing base 211 is fixedly attached to an inner surface of the piston cylinder 1, the bearing middle seat 212 is located between the bearing bases 211, ball grooves 2121 are formed in two side surfaces of the bearing middle seat 212, ball grooves 2121 are also formed in a side surface of the bearing base 211 close to the bearing middle seat 212, the retainer 213 is located between the bearing middle seat 212 and the bearing base 211, the balls 214 are installed in the retainer 213, surfaces of the balls 214 are attached to the bearing base 211 and groove surfaces of the ball grooves 2121 on the bearing middle seat 212, and the bearing middle seat 212 can rotate relative to the bearing base 211 under the action of the balls 214.

When the piston rotates along with the cylinder 7, that is, the piston cylinder 1 rotates along with the cylinder 7, the bearing base 211 fixedly connected with the piston cylinder 1 rotates together, and under the action of the balls 214 in the ball grooves 2121, the bearing base 211 rotates relative to the bearing middle base 212, wherein the retainer 213 is used for maintaining the distance between the balls 214.

Further, the connecting shaft 22 penetrates through the bearing base 211 and is fixedly connected with the bearing middle seat 212, when the electric hammer works, the driving part drives the connecting rod 3, the connecting rod 3 drives the connecting shaft 22, and the connecting shaft 22 drives the bearing middle seat 212 and the piston cylinder 1 to reciprocate in the cylinder 7.

Further, the bearing base 211 includes an upper bearing base 2111 and a lower bearing base 2112, the upper bearing base 2111 is located above the bearing middle seat 212, the lower bearing base 2112 is located below the bearing middle seat 212, and the lower bottom surface of the lower bearing base 2112 is fixedly attached to the inner bottom surface of the piston cylinder 1.

In the design, the ball 214 is installed in the ball groove 2121 through the upper bearing base 2111, the lower bearing base 2112 and the bearing middle seat 212, the bearing middle seat 212 can rotate relative to the bearing base 211 through the rolling of the ball 214, and the upper bearing base 2111 and the lower bearing base 2112 are fixed in the piston cylinder 1, so that the bearing base 211, the bearing middle seat 212, the ball 214 and the retainer 213 are combined to form a double-sided bearing, and the outer diameter of the bearing middle seat 212 is smaller than that of the bearing base 211.

Further, a clamp spring groove 11 is formed in the inner wall of the piston cylinder 1, the clamp spring groove 11 is located above the upper bearing base 2111, a clamp spring 111 is further arranged in the clamp spring groove 11, and the clamp spring 111 can clamp the upper bearing base 2111.

In order to prevent the bearing base 211 from displacing due to rotation and reciprocating motion when the electric hammer works, the ball 214 falls off and the bearing middle shaft shakes to damage the electric hammer, so that accidents occur or the impact effect of the electric hammer is influenced, the position of the upper bearing base 2111 is limited by the clamp spring 111, and the inner bottom surface of the piston cylinder 1 and the clamp spring 111 form an installation partition section for installing the bearing base 211.

Further, both ends of the connecting rod 3 are semi-cylindrical and are respectively a first connecting end 31 and a second connecting end 32, the first connecting end 31 and the second connecting end 32 are respectively provided with a connecting hole 33, the first connecting end 31 is radially provided with a mounting groove 311, and the mounting groove 311 is located at an axial middle position.

Furthermore, the end of the connecting shaft 22 is also provided with a connecting hole 33, the end of the connecting shaft 22 is installed in the installation groove 311, and the connecting rod pin 4 is inserted into the connecting hole 33 of the end of the connecting shaft 22 and the first connecting end 31 respectively to movably connect the connecting shaft 22 with the connecting rod 3.

The connecting rod 3 matched with the connecting shaft 22 is designed, when the connecting rod 3 drives the piston to do reciprocating motion, the connecting position of the connecting rod 3 and the connecting shaft 22 needs to rotate relatively, and the mounting groove 311 is arranged at the first connecting end 31 of the connecting rod 3, so that the connecting hole 33 at the connecting shaft 22 is aligned with the connecting hole 33 at the first connecting end 31 of the connecting rod 3, the pin of the connecting rod 3 can be conveniently mounted, and the rotation of the connecting position of the connecting rod 3 and the connecting shaft 22 can be realized.

Further, the outer wall of the piston cylinder 1 is provided with a sealing groove 12, and the sealing groove 12 is close to the bottom of the piston cylinder.

When the piston does reciprocating and rotary motion in the cylinder 7, in order to avoid the air pressure in the cylinder 7 from leaking out when the piston moves, a sealing groove 12 is arranged at the position, close to the bottom end, of the outer wall of the piston and used for additionally installing a sealing ring and reducing the air pressure generated when the piston moves from leaking out.

Further, a shaft groove 13 is arranged at the bottom in the piston cylinder 1.

When the connecting shaft 22 is installed, the bottom of the connecting shaft 22 can be inserted into the shaft groove 13, in order to prevent the installation influence caused by the overlong installation end of the connecting shaft 22, the shaft groove 13 is arranged at the bottom in the piston cylinder 1, so that the bottom end of the connecting shaft 22 can be inserted into the shaft groove 13, and the installation of the piston sleeve 2 is facilitated.

The embodiment of the utility model also provides an electric hammer, which comprises an electric hammer body 5, an impact part 6, a cylinder 7, a cylinder driving mechanism 8, a piston driving mechanism 9 and a main driving part 10, wherein the impact part 6, the cylinder 7, the cylinder driving mechanism 8, the piston driving mechanism 9 and the main driving part 10 are all arranged in the electric hammer body 5, the main driving part 10 is respectively connected with the cylinder driving mechanism 8 and the piston driving mechanism 9, the cylinder driving mechanism 8 is connected with the cylinder 7, the impact part 6 is positioned at the front end of the cylinder 7, the piston is arranged in the cylinder 7, and a second connecting end 32 of a piston connecting rod 3 is connected with the piston driving mechanism 9, wherein the piston selected in the embodiment of the utility model is the piston provided by the embodiment of the utility model.

When the electric hammer works, the main driving part 10 drives the cylinder driving mechanism 8 and the piston driving mechanism 9, the cylinder driving mechanism 8 drives the cylinder 7 to do rotary motion, the piston driving mechanism 9 drives the connecting rod 3 of the piston, and then the connecting rod 3 drives the piston in the cylinder 7 to do reciprocating linear motion in the cylinder 7, wherein when the cylinder 7 rotates, the piston barrel 1 rotates along with the cylinder 7 under the action of friction force, so that the piston does rotary motion while doing reciprocating linear motion;

when the piston cylinder 1 rotates, the piston assembly 2 does not rotate, but the bearing base 211 fixedly connected with the piston cylinder 1 rotates, and under the action of the balls 214 in the ball grooves 2121, the bearing base 211 and the bearing middle seat 212 do relative rotation motion.

While the utility model has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the utility model.

Claims (10)

1. A piston, characterized by: including piston barrel, piston external member, connecting rod and connecting rod round pin, the piston external member install in the piston barrel, the piston external member includes runner assembly and connecting axle, runner assembly set up in the piston barrel, the connecting axle with runner assembly connects, the piston barrel rotates and to drive runner assembly with the relative rotation is done to the connecting axle, the connecting rod round pin inserts connecting rod and connecting axle tip, the connecting rod with the connecting axle passes through connecting rod round pin swing joint.

2. The piston of claim 1, wherein: the rotating assembly comprises a bearing base, a bearing middle seat, a retainer and balls, wherein the outer cylindrical surface of the bearing base is fixedly attached to the inner surface of the piston cylinder, the bearing middle seat is located between the bearing bases, ball grooves are formed in two side faces of the bearing middle seat, the bearing base is close to the side face of the bearing middle seat, the ball grooves are also formed in the side face of the bearing middle seat, the retainer is located between the bearing middle seat and the bearing base, the balls are installed in the retainer, the surfaces of the balls are attached to the surfaces of the ball grooves in the bearing base and the bearing middle seat, and the bearing middle seat can rotate relative to the bearing base under the action of the balls.

3. The piston of claim 2, wherein: the connecting shaft penetrates through the bearing base and is fixedly connected with the bearing middle seat.

4. The piston of claim 2, wherein: the bearing base comprises an upper bearing base and a lower bearing base, the upper bearing base is located above the bearing middle seat, the lower bearing base is located below the bearing middle seat, and the lower bottom surface of the lower bearing base is fixedly attached to the inner bottom surface of the piston cylinder body.

5. The piston of claim 4, wherein: the piston comprises an upper bearing base and a lower bearing base, and is characterized in that a clamp spring groove is formed in the inner wall of the piston barrel and located above the upper bearing base, and a clamp spring is further arranged in the clamp spring groove and can clamp the upper bearing base.

6. The piston of claim 1, wherein: the connecting rod is characterized in that two ends of the connecting rod are both semi-cylindrical and are respectively a first connecting end and a second connecting end, connecting holes are respectively formed in the first connecting end and the second connecting end, a mounting groove is formed in the first connecting end in the radial direction, and the mounting groove is located in the axial middle position.

7. The piston of claim 6, wherein: the connecting shaft is characterized in that a connecting hole is also formed in the end part of the connecting shaft, the end part of the connecting shaft is installed in the installing groove, and the connecting rod pin is respectively inserted into the connecting hole in the end part of the connecting shaft and the connecting hole in the first connecting end to movably connect the connecting shaft with the connecting rod.

8. The piston of claim 1, wherein: the outer wall of the piston cylinder is provided with a sealing groove, and the sealing groove is close to the bottom of the piston cylinder.

9. The piston of claim 1, wherein: the bottom in the piston cylinder is also provided with a shaft groove.

10. An electric hammer, characterized in that: the electric hammer comprises an electric hammer body, an impact part, a cylinder driving mechanism, a piston driving mechanism and a main driving part, wherein the impact part, the cylinder driving mechanism, the piston driving mechanism and the main driving part are all arranged in the electric hammer body, the piston is the piston according to any one of claims 1 to 9, the main driving part is respectively connected with the cylinder driving mechanism and the piston driving mechanism, the cylinder driving mechanism is connected with the cylinder, the impact part is positioned at the front end of the cylinder, the piston is installed in the cylinder, and the second connecting end of a piston connecting rod is connected with the piston driving mechanism.

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