CN216989995U

CN216989995U - Clutch cam structure for percussion drill

Info

Publication number: CN216989995U
Application number: CN202220508059.1U
Authority: CN
Inventors: 华旭巍
Original assignee: Ningbo Jinxi Precision Machinery Co ltd
Current assignee: Ningbo Jinxi Precision Machinery Co ltd
Priority date: 2022-03-08
Filing date: 2022-03-08
Publication date: 2022-07-19
Anticipated expiration: 2032-03-08

Abstract

The utility model discloses a clutch cam structure for a percussion drill, which comprises a driving shaft connected with a driving motor and a rotating rod connected with a drill bit, and is characterized in that: still include the axis of rotation, the transmission shaft, the cam, first bevel gear, second bevel gear and one way clutch, the axis of rotation rotates and sets up in the casing, first bevel gear sets up on the transmission shaft, cam and second bevel gear set gradually in the axis of rotation, first bevel gear and second bevel gear intermeshing, the bull stick tip forms the drive disk, be provided with the transmission post on the drive disk, be provided with the closed slot on the cam, the transmission post inserts the closed slot, set up a drive groove that penetrates in the bull stick on the drive disk, the one end shape and the drive groove looks adaptation of transmission shaft just insert the drive groove in, one way clutch sets up between the other end of transmission shaft and the drive shaft. The utility model provides a clutch cam structure for a percussion drill, which can automatically slip when a steel bar drill bit is blocked in the drilling process.

Description

Clutch cam structure for percussion drill

Technical Field

The utility model relates to a clutch cam structure for a percussion drill.

Background

An electric impact drill (electric impact drill) mainly uses rotary cutting and has an impact mechanism which produces impact force by means of the thrust of an operator, and is used for an electric tool for drilling holes in materials such as bricks, building blocks, light walls and the like. The existing impact drill is not protected by a clutch usually, the clutch is used for protecting the safety of a user, and when the impact drill is used for drilling, a reinforcing steel bar cannot rotate reversely to hurt people. It can automatically slip when the machine tool is overloaded or the drill bit is stuck, so that the motor is prevented from being burnt out due to overload.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem of the prior art, and provides a clutch cam structure for a percussion drill, which can automatically slip when a steel bar drill bit is blocked in the drilling process.

The technical scheme adopted by the utility model for solving the technical problems is as follows: the utility model provides a strike and bore with separation and reunion cam structure, includes the actuating shaft that links to each other with driving motor, the bull stick that links to each other with the drill bit, its characterized in that: the transmission mechanism comprises a transmission shaft, a cam, a first bevel gear, a second bevel gear and a one-way clutch, wherein the rotation shaft is rotatably arranged in the percussion drill shell, the first bevel gear is arranged on the transmission shaft, the cam and the second bevel gear are sequentially arranged on the rotation shaft, the first bevel gear and the second bevel gear are meshed with each other, a transmission disc is formed at the end part of the rotation rod, a transmission column is arranged on the transmission disc, a closed groove matched with the outline of the cam is formed in the cam, the transmission column is inserted into the closed groove, a transmission groove penetrating into the rotation rod is formed in the transmission disc, one end of the transmission shaft is matched with the transmission groove in shape and is inserted into the transmission groove, and the one-way clutch is arranged between the other end of the transmission shaft and the drive shaft.

As a modification, the first bevel gear, the rotating shaft and the cam have two groups and are symmetrically arranged on two sides of the transmission shaft.

The improved clutch is characterized in that the one-way clutch comprises a clutch outer ring and a clutch inner ring, a connecting hole is formed in the clutch outer ring, a driving shaft is connected with the clutch outer ring through the connecting hole, the other end of the driving shaft is in transmission connection with the clutch inner ring, a shaft shoulder ring is formed on the outer wall of the middle part of the clutch inner ring, a butting ring is sleeved on the shaft shoulder ring, fastening screws which are abutted to the outer wall of the butting ring are arranged on the outer wall of the clutch outer ring, ball bearings are respectively sleeved on two sides of the shaft shoulder ring on the clutch inner ring, a clamping ring is arranged on the inner wall of the clutch outer ring, the ball bearing inner ring is abutted to the shaft shoulder ring, the ball bearing outer ring is arranged between the butting ring and the clamping ring, one-way bearings are arranged outside the ball bearings between the clutch inner ring and the clutch outer ring, and a sealing cover is arranged outside the one-way bearings.

The one-way bearing is improved, the one-way bearing comprises an inner ring, an outer ring, a roller, one-way cams, a support frame and spring rings, the inner ring is sleeved outside the clutch inner ring, the outer ring is arranged on the inner wall of the clutch outer ring, the support frame is arranged between the inner ring and the outer ring and used for supporting the one-way cams, the roller and the one-way cams are alternately arranged between the inner ring and the outer ring, and the spring rings are sleeved on the one-way cams.

In the improvement, a one-way clutch is arranged between the rotating shaft and the cam.

Compared with the prior art, the utility model has the advantages that: in the process of impact drilling, the driving motor drives the driving shaft to rotate, on one hand, the driving shaft drives the transmission shaft to rotate, and the transmission shaft drives the rotating rod to rotate so as to realize the rotation of the drill bit, on the other hand, the rotating shaft is driven to rotate simultaneously due to the meshing effect of the first bevel gear and the second bevel gear, the rotating shaft drives the cam to rotate, and under the action of the cam, the rotating rod can also realize back and forth movement so as to realize the impact effect.

Drawings

FIG. 1 is a schematic structural view of a clutch cam structure for a percussion drill according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of the one-way clutch of FIG. 1;

FIG. 3 is a schematic structural view of the one-way bearing of FIG. 2;

fig. 4 is a schematic view of a connection structure between the cam and the transmission disc of fig. 1.

Detailed Description

The utility model is described in further detail below with reference to the accompanying examples.

As shown in fig. 1 to 4, the clutch cam structure for impact drilling in the present embodiment includes a drive shaft 1, a rotating lever 2, a rotating shaft 4, a transmission shaft 3, a cam 6, a first bevel gear 51, a second bevel gear 52, and a one-way clutch 7.

As shown in fig. 1 and 4, the driving shaft 1 is connected to a driving motor, the rotary rod 2 is connected to a drill bit, the rotating shaft 4 is rotatably disposed in the percussion drill housing 10, the first bevel gear 51 is disposed on the driving shaft 3, the cam 6 and the second bevel gear 52 are sequentially disposed on the rotating shaft 4, the first bevel gear 51 and the second bevel gear 52 are engaged with each other, the end of the rotary rod 2 forms a driving disc 21, the driving disc 21 is provided with a driving post 211, the cam 6 is provided with a closed slot adapted to an outer contour of the cam 6, the driving post 211 is inserted into the closed slot, the driving disc 21 is provided with a driving slot 22 penetrating into the rotary rod 2, preferably, the driving slot 22 is a spline slot structure, one end of the driving shaft 3 is adapted to the driving slot 22 and inserted into the driving slot 22, and the one-way clutch 7 is disposed between the other end of the driving shaft 3 and the driving shaft 1. Preferably, the first bevel gear 41, the rotating shaft 4 and the cam 6 have two sets and are symmetrically arranged on two sides of the transmission shaft 3, and stable impact action is provided for the impact drill conveniently by arranging two sets of cam transmission structures.

Further, a one-way clutch 7 is provided between the rotating shaft 4 and the cam 6. By also providing a similar one-way clutch 7 between the rotary shaft 4 and the cam 6, the impact action of the percussion drill can be quickly eliminated when the drill bit is stuck, further improving safety.

Furthermore, in the embodiment of the present invention, as shown in fig. 2, the one-way clutch 7 includes a clutch outer 71 and a clutch inner 71, the clutch outer 72 is provided with a connecting hole 721, the driving shaft 1 is connected with the clutch outer 72 through the connecting hole 721, the other end of the driving shaft 3 is in transmission connection with the clutch inner 71, a shaft shoulder ring 711 is formed on the outer wall of the middle portion of the clutch inner 71, a leaning ring 73 is sleeved on the shaft shoulder ring 711, a fastening screw 76 which is in contact with the outer wall of the leaning ring 72 is provided on the outer wall of the clutch outer 72, ball bearings 74 are respectively sleeved on the clutch inner 71 at two sides of the shaft shoulder ring 711, a snap ring 75 is provided on the inner wall of the clutch outer 72, the inner ring of the ball bearings 74 is in contact with the shaft shoulder ring 711, the outer ring of the ball bearings is provided between the leaning ring 73 and the snap ring 75, a one-way bearing 77 is provided between the clutch inner 71 and the clutch outer 72 and outside of the ball bearings 74, a cap 78 is provided outside the one-way bearing 77.

In the embodiment of the present invention, as shown in fig. 3, the one-way bearing 77 may have a plurality of structures, and in the embodiment of the present invention, the one-way bearing 77 includes an inner ring 771, an outer ring 772, a roller 773, a one-way cam 774, a support frame 776, and a spring ring 775, where the inner ring 771 is sleeved on the outside of the clutch inner ring 71, the outer ring 772 is disposed on the inner wall of the clutch outer ring 72, the support frame 776 is disposed between the inner ring and the outer ring to support the one-way cam 774, the roller 773 and the one-way cam 774 are alternately disposed between the inner ring and the outer ring, and the spring ring 775 is sleeved on each one-way cam 774. The one-way bearing 77 adopting the one-way cam 774 structure enables the one-way bearing 77 to realize quick response.

In conclusion, in the process of impact drilling, the driving motor drives the driving shaft 1 to rotate, on one hand, the driving shaft 1 drives the driving shaft 3 to rotate, and the driving shaft 3 drives the rotating rod 2 to rotate, so that the drill bit rotates, on the other hand, due to the meshing action of the first bevel gear 51 and the second bevel gear 52, the rotating shaft 4 is simultaneously driven to rotate, the rotating shaft 4 drives the cam 6 to rotate, under the action of the cam 6, the rotating rod 2 can also move back and forth, so that the impact action is realized, meanwhile, the one-way clutch 7 is arranged between the driving shaft 1 and the driving shaft 3, when the reinforcing steel bar drill bit is blocked in the drilling process, the driving shaft 3 can slip in the one-way clutch 7, and the driving shaft 3 cannot transmit the reaction force to the driving shaft 1, so that the safety protection effect is realized.

Claims

1. The utility model provides a strike and bore with separation and reunion cam structure, includes drive shaft (1) that links to each other with driving motor, bull stick (2) that link to each other with the drill bit, its characterized in that: the automatic drill bit further comprises a rotating shaft (4), a transmission shaft (3), a cam (6), a first bevel gear (51), a second bevel gear (52) and a one-way clutch (7), wherein the rotating shaft (4) is rotatably arranged in the percussion drill shell (10), the first bevel gear (51) is arranged on the transmission shaft (3), the cam (6) and the second bevel gear (52) are sequentially arranged on the rotating shaft (4), the first bevel gear (51) and the second bevel gear (52) are meshed with each other, a transmission disc (21) is formed at the end part of the rotating rod (2), a transmission column (211) is arranged on the transmission disc (21), a closed groove matched with the outer contour of the cam (6) is arranged on the cam (6), the transmission column (211) is inserted into the closed groove, a transmission groove (22) penetrating into the rotating rod (2) is formed on the transmission disc (21), the shape of one end of the transmission shaft (3) is matched with the shape of the transmission groove (22) and is inserted into the transmission groove (22), the one-way clutch (7) is arranged between the other end of the transmission shaft (3) and the driving shaft (1).

2. The clutch cam structure for a percussion drill according to claim 1, wherein: the first bevel gear (51), the rotating shaft (4) and the cam (6) are provided with two groups and are symmetrically arranged on two sides of the transmission shaft (3).

3. The clutch cam structure for a percussion drill according to claim 1, wherein: the one-way clutch (7) comprises a clutch outer ring (72) and a clutch inner ring (71), a connecting hole (721) is formed in the clutch outer ring (72), a driving shaft (1) is connected with the clutch outer ring (72) through the connecting hole (721), the other end of a transmission shaft (3) is in transmission connection with the clutch inner ring (71), a shaft shoulder ring (711) is formed on the outer wall of the middle part of the clutch inner ring (71), a leaning ring (73) is sleeved on the shaft shoulder ring (711), a fastening screw (76) which is propped against the outer wall of the leaning ring (73) is arranged on the outer wall of the clutch outer ring (72), ball bearings (74) are respectively sleeved on two sides of the shaft shoulder ring (711) on the clutch inner ring (71), a clamping ring (75) is arranged on the inner wall of the clutch outer ring (72), the inner rings of the ball bearings (74) are propped against the shaft shoulder ring (711), the outer rings of the ball bearings (74) are arranged between the leaning ring (73) and the clamping ring (75), a one-way bearing (77) is disposed between the clutch inner ring (71) and the clutch outer ring (72) and outside the ball bearing (74), and a cover (78) is disposed outside the one-way bearing (77).

4. The clutch cam structure for a percussion drill according to claim 3, wherein: one-way bearing (77) include inner circle (771), outer lane (772), roller (773), one-way cam (774), support frame (776) and spring coil (775), the outside of separation and reunion inner circle (71) is located to inner circle (771) cover, outer lane (772) set up on the inner wall of separation and reunion outer lane (72), support frame (776) set up and are used for supporting one-way cam (774) between inner circle (771) and outer lane (772), roller (773) and one-way cam (774) set up in turn between inner circle (771) and outer lane (772), spring coil (775) cover establish with each one-way cam (774).

5. The clutch cam structure for a percussion drill according to claim 1, wherein: and a one-way clutch (7) is arranged between the rotating shaft (4) and the cam (6).