CN218226479U - Transmission and clutch protection device of light electric hammer - Google Patents

Abstract

The utility model discloses a transmission and separation and reunion protection device of light-duty electric hammer belongs to electric hammer technical field, including output shaft, first jump ring, spring, tiny steel ball, separation and reunion disc, face gear, cylinder pin, packing ring, second jump ring and motor shaft, first recess and second recess have been seted up respectively to the both sides on output shaft surface being the annular, the surface of output shaft is the annular and has seted up the circular arc recess in proper order, the quantity of circular arc recess is four, first jump ring joint is in the inner chamber of first recess, the spring cup joints in the surface of output shaft, one side of spring is laminated with one side of first jump ring. Through increasing a mechanical type safety clutch assembly in light-duty electric hammer, when electric hammer normally drills, but this assembly transmission motor moment of torsion to the output shaft, when drilling the drill bit touch the reinforcing bar and appear drill bit and output shaft card dead phenomenon, but the moment of torsion of release motor of the mutual friction motion of this device internals.

Description

Transmission and clutch protection device of light electric hammer

Technical Field

The utility model relates to an electric hammer technical field specifically is a transmission and separation and reunion protection device of light-duty electric hammer.

Background

The electric hammer is an electric rotary hammer drill with a safety clutch and a pneumatic hammering mechanism. The electric hammer utilizes the principle of piston motion, compresses gas to impact a drill bit, does not need much strength of hand, and can open holes on hard materials such as concrete, bricks, stones and the like; the light electric hammer has the advantages of small overall dimension, light weight and the like, and the demand of the light electric hammer is increasing.

Common light-duty electric hammer does not have the function of safe separation and reunion on the market, and the machine can get rid of when resulting in bumping into hard stone or reinforcing bar when drilling, can injure user's arm when serious, consequently needs the transmission and the separation and reunion protection device of a light-duty electric hammer.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a transmission and separation and reunion protection device of light-duty electric hammer, through increase a mechanical type safety clutch assembly in light-duty electric hammer, when electric hammer normally drills, but this assembly transmission motor moment of torsion to the output shaft on, when the drill bit runs into the reinforcing bar when drilling and appears drill bit and the dead phenomenon of output shaft card, but this device internals friction motion each other releases the moment of torsion of motor to solve the problem that proposes in the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a transmission and separation and reunion protection device of light-duty electric hammer, includes output shaft, first jump ring, spring, tiny steel ball, separation and reunion disc, face gear, cylinder pin, packing ring, second jump ring and motor shaft, the both sides on output shaft surface are the annular and have seted up first recess and second recess respectively, the surface of output shaft is the annular circular arc recess of having seted up in proper order, the quantity of circular arc recess is four, first jump ring joint in the inner chamber of first recess, the spring cup joints in the surface of output shaft, one side of spring and one side laminating of first jump ring, the lower half of tiny steel ball runs through circular arc recess and activity assembly in the inner chamber of circular arc recess.

Preferably, the inner ring of the clutch disc is annular, and semicircular grooves matched with the small steel balls for use are sequentially formed in the inner ring of the clutch disc, and the clutch disc is assembled on the surface of the output shaft through the matching of the semicircular grooves and the small steel balls.

Preferably, one side of the clutch disc is attached to the other side of the spring, the other side of the clutch disc is annularly and sequentially provided with a first semi-cylindrical groove, one side of the face gear is annularly and sequentially provided with a second semi-cylindrical groove matched with the first semi-cylindrical groove in use, and inner cavities of the first semi-cylindrical groove and the second semi-cylindrical groove are all provided with cylindrical pins.

Preferably, the inner ring of the face gear and the inner ring of the washer are sequentially sleeved on the surface of the output shaft, one side of the washer is attached to the other side of the face gear, the second clamp spring is clamped in the inner cavity of the second groove, and the other side of the face gear is engaged with the motor shaft.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the utility model provides a transmission and separation and reunion protection device of light-duty electric hammer, through the face gear, the cooperation of cylinder pin and separation and reunion disc, the electric hammer is normal during operation, motor shaft drives face gear revolve, and the face gear passes through the cylinder pin and drives the separation and reunion disc and rotate, and the cooperation through separation and reunion disc and tiny steel ball drives output shaft and drill bit rotation, when the dead circumstances of drill bit and output shaft card appears, motor shaft and face gear can't stop immediately, and when the normal moment of torsion of face gear is greater than the friction torque that the cylinder pin bore, the face gear will drive the cylinder pin and make the circumference slip in separation and reunion disc side this moment, the spring is compressed and resets and goes on in turn simultaneously, release the moment of torsion of motor from this, the machine can get rid of when avoiding touchhing the stone of hard when drilling or the reinforcing bar, the condition that can injure user's arm when serious takes place, and is suitable for popularization and use.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention;

fig. 2 is a schematic structural view of the small steel ball, the clutch disc, the face gear, the cylindrical pin, the washer and the second snap spring of the present invention;

fig. 3 is a schematic structural view of the clutch disc, the face gear, the cylindrical pin, the washer and the second snap spring of the present invention;

fig. 4 is the utility model discloses an output shaft and first jump ring schematic structure.

Reference numbers in the figures: 1. an output shaft; 2. a first clamp spring; 3. a spring; 4. a small steel ball; 5. a clutch disc; 6. a face gear; 7. a cylindrical pin; 8. a gasket; 9. a second clamp spring; 10. a motor shaft; 11. a first groove; 12. a second groove; 13. a circular arc groove; 14. a semicircular groove; 15. a first semi-cylindrical recess; 16. a second semi-cylindrical recess.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The utility model provides a as shown in fig. 1 ~ 4 transmission and separation and reunion protection device of light-duty electric hammer, including output shaft 1, first jump ring 2, spring 3, little steel ball 4, separation and reunion disc 5, face gear 6, cylindrical pin 7, packing ring 8, second jump ring 9 and motor shaft 10, the both sides on output shaft 1 surface are the annular and have seted up first recess 11 and second recess 12 respectively, circular arc recess 13 has been seted up in proper order to output shaft 1's surface, circular arc recess 13's quantity is four, first jump ring 2 joint is in the inner chamber of first recess 11, spring 3 cup joints in output shaft 1's surface, one side of spring 3 and the laminating of one side of first jump ring 2, the lower half of little steel ball 4 runs through circular arc recess 13 and the activity assembles in the inner chamber of circular arc recess 13, circular arc recess 13 and outside extension are run through at the top of little steel ball 4.

The inner ring of the clutch disc 5 is annular, semicircular grooves 14 matched with the small steel balls 4 are sequentially formed in the inner ring, the clutch disc 5 is assembled on the surface of the output shaft 1 through the matching of the semicircular grooves 14 and the small steel balls 4, when the clutch disc 5 is assembled on the surface of the output shaft 1, the arc grooves 13 and the semicircular grooves 14 form a cavity, and the small steel balls 4 are movably assembled inside the cavity.

One side of clutch disc 5 and the opposite side laminating of spring 3, the opposite side of clutch disc 5 is the annular and has seted up first half cylindrical recess 15 in proper order, and one side of face gear 6 is the annular and has seted up in proper order with the first half cylindrical recess 15 cooperation second half cylindrical recess 16 that uses, and the inner chamber of first half cylindrical recess 15 and second half cylindrical recess 16 all is equipped with cylinder pin 7, makes clutch disc 5 dock with face gear 6 through cylinder pin 7.

The surface in output shaft 1 is all cup jointed in proper order to the inner circle of face gear 6 and the inner circle of packing ring 8, and one side of packing ring 8 is laminated with the opposite side of face gear 6, and second jump ring 9 joint has motor shaft 10 in the inner chamber of second recess 12, and the opposite side meshing of face gear 6 has protected face gear 6 through packing ring 8 to it is spacing to utilize second jump ring 9.

When the clutch device is used specifically, a user drives the face gear 6 to rotate through the motor shaft 10, so that the face gear 6 drives the clutch disc 5 to rotate through the four cylindrical pins 7, the clutch disc 5 drives the output shaft 1 and the drill bit to rotate through the four small steel balls 4, when the phenomenon that the drill bit and the output shaft 1 are clamped is generated, the motor shaft 10 and the face gear 6 cannot be stopped immediately and still are in a running state, and when the normal torque of the face gear 6 is larger than the friction torque borne by the four cylindrical pins 7, the face gear 6 is used for driving the four cylindrical pins 7 to circumferentially slide on the side face of the clutch disc 5, meanwhile, the spring 3 is compressed and reset alternately, therefore, the torque of the motor can be released through mutual friction motion of internal parts of the device, and potential safety hazards can be effectively eliminated.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (4)

1. The utility model provides a transmission and separation and reunion protection device of light-duty electric hammer, includes output shaft (1), first jump ring (2), spring (3), little steel ball (4), separation and reunion disc (5), face gear (6), cylinder pin (7), packing ring (8), second jump ring (9) and motor shaft (10), its characterized in that: first recess (11) and second recess (12) have been seted up respectively to the both sides on output shaft (1) surface are the annular, circular arc recess (13) have been seted up in proper order to the surface of output shaft (1), the quantity of circular arc recess (13) is four, first jump ring (2) joint in the inner chamber of first recess (11), spring (3) cup joint in the surface of output shaft (1), one side of spring (3) and one side laminating of first jump ring (2), the lower half of tiny steel ball (4) runs through circular arc recess (13) and the activity assembles in the inner chamber of circular arc recess (13).

2. The transmission and clutch protector for light electric hammer as claimed in claim 1, wherein: the inner ring of the clutch disc (5) is annular, semicircular grooves (14) matched with the small steel balls (4) are sequentially formed in the inner ring of the clutch disc (5), and the clutch disc (5) is assembled on the surface of the output shaft (1) through the matching of the semicircular grooves (14) and the small steel balls (4).

3. The transmission and clutch protector for light electric hammer as claimed in claim 2, wherein: one side of separation and reunion disc (5) and the opposite side laminating of spring (3), the opposite side of separation and reunion disc (5) is the annular and has seted up first half cylinder type recess (15) in proper order, one side of face gear (6) is the annular and has seted up second half cylinder type recess (16) that uses with first half cylinder type recess (15) cooperation in proper order, the inner chamber of first half cylinder type recess (15) and second half cylinder type recess (16) all is equipped with cylinder pin (7).

4. A transmission and clutch protector for a light electric hammer as set forth in claim 3, wherein: the inner ring of the face gear (6) and the inner ring of the gasket (8) are sequentially sleeved on the surface of the output shaft (1), one side of the gasket (8) is attached to the other side of the face gear (6), the second clamp spring (9) is clamped in the inner cavity of the second groove (12), and the other side of the face gear (6) is meshed with the motor shaft (10).

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