WO2006029574A1

WO2006029574A1 - A drilling electric tool

Info

Publication number: WO2006029574A1
Application number: PCT/CN2005/001480
Authority: WO
Inventors: Chengdao Li; Gen Sun
Original assignee: Positec Power Tools (Suzhou) Co., Ltd.
Priority date: 2004-09-17
Filing date: 2005-09-16
Publication date: 2006-03-23
Also published as: CN100563942C; CN1748950A

Abstract

The present invention discloses a drilling electric tool. The electric tool includes a front housing (2), a output shaft (14) running through the front housing, a active cam (10) fixedly connected with the shaft, a fixing cam (8) connected with the front housing, a support member (19), a first return member (9) provided between the support member and the cam (10), and a ring (11) connected with the inner chamber of the front housing. Moreover, said shaft runs through the ring and a bearing bush (13), and a second return member (12) is provided between the ring and the bush. Ring teeth (112) are provided in the place in which the ring faces toward the bush. Furthermore, bush teeth (131) corresponding to the ring teeth are provided in the place in which the bush faces toward the ring. The drilling electric tool will turn to-an impact working mode when the bush teeth are engaged with the ring teeth. Therefore, the drilling electric tool may choose a working mode rapidly and easily by only rotating an adjusting sleeve.

Description

Drilling power tools

Technical field

The present invention relates to a drill-type power tool, and more particularly to an electro-cobalt that can adjust all modes of operation of the tool using an adjustment cover.

Background technique

Among the existing drilling power tools that can realize the conversion of the torque adjustment, the drilling and the impact mode, there are many types of design structures, such as the German patent DE20007588U1, which was issued on August 31, 2000, which discloses a cobalt-plating type. The power tool, the impact of the patent, the cobalt into the working mode is converted by hand rotating a first conversion ring, and the torque adjustment is achieved by cooperating the first conversion ring and the second conversion ring. The first rotating ring is extended in the rear axial direction by three keys in combination with the axial key groove on the front side of the first transmitting member, and twisting the first rotating ring can drive the first transmitting member to rotate. The rear side of the first transmitting member is axially disposed with a plurality of inclined protrusions, and the static end teeth are integrally formed in the second transfer inner cavity, and the front end of the cylindrical outer casing of the second transmitting member is provided with the number and the A respective one of the plurality of axially extending grooves with corresponding bevels. By twisting the first rotating ring, the protrusion on the first transmitting member and the groove on the second transmitting member can be combined, and the protrusion can be climbed out from the groove and supported on the rear end surface of the second transmitting member. When the protrusion is combined with the groove, the output shaft outputs a rotary impact motion; when the protrusion climbs out of the groove and abuts against the rear end surface of the second transmission member, the output shaft output rotates, and at this time, the drill can pass the torque Adjustment can be used as a screwdriver, and drilling can also be done.

The shortcomings of the working mode adjustment structure of the drill are: Torque adjustment and the need to realize the impact output, and it is necessary to cooperatively adjust the two rotating rings to realize the operation is inconvenient. Moreover, when the drill is in the non-impact mode, there is no mode switching structure setting between the drilling and the torque adjustment, so that there is room for adjustment when the operator performs the drilling motion, so if the output shaft end If the load is greater than the torque setting at the torque adjustment, the output shaft will not stop due to insufficient back torque, and the drilling work cannot be carried out. In addition, the conversion of the impact and non-impact modes must be completely disengaged by the operator's hand to make the bulge and groove climb off. It takes a lot of force to complete the conversion, and the drilling takes a long time. It is prone to the phenomenon that the operator wears the climbing slope during non-impact work, the bump slips into the groove, and the output is accidentally output.

In order to overcome the deficiencies of the above various power tools, it is necessary to design a drill-type power tool with an improved working mode switching structure.

Summary of the invention

The technical problem to be solved by the present invention is to provide an electric drill that performs switching of each working mode through a rotary adjusting cover, and the output is stable under the operation of each mode.

The technical solution of the present invention for solving the technical problem is: A cobalt type electric tool, comprising: a front case, which is worn on the confirmed An output shaft in the front housing, a movable end tooth fixedly connected to the output shaft, a static end tooth connected to the front housing, a support, and a first reset disposed between the support and the movable end tooth The component is characterized in that: a grooved disk is connected to the inner cavity of the front casing, the output shaft passes through the grooved disk and the bearing sleeve, and the second resetting element is disposed on the grooved disk and the bearing sleeve a grooved tooth is disposed on a portion of the grooved disk facing the bearing sleeve, and a bearing sleeve corresponding to the grooved disk tooth is disposed on a portion of the bearing sleeve facing the grooved disk, the bearing When the set of teeth cooperates with the grooved teeth, the drill-type power tool is in an impact mode of operation.

The invention has the beneficial effects of providing an electro-cobalt which can conveniently and quickly select the working mode of the drill-type electric tool only by the rotation of the single-adjusting cover, and at the same time, the cobalt output is stable in each mode.

DRAWINGS

The invention is further described below in conjunction with the drawings and specific embodiments.

1 is a partial cross-sectional view of the drill-type power tool of the present invention, in an initial state of torque adjustment;

Figure 2 is a cross-sectional view taken along line A-A of Figure 1;

Figure 3 is an output shaft assembly of the drill-type power tool of the present invention;

Figure 4 is an exploded view of related parts of the drill-type power tool of the present invention;

Figure 5 is an exploded view of the output shaft assembly of Figure 3;

Figure 6 is a partial cross-sectional view showing the drill-type power tool of the present invention in a state where the torque is adjusted to the maximum; Figure Ί is a cross-sectional view taken along line B-B of Figure 6;

Figure 8 is a partial cross-sectional view showing the drill-type power tool of the present invention, in a cobalt-in operation mode;

Figure 9 is a cross-sectional view taken along line C-C of Figure 8;

Figure 10 is a partial cross-sectional view showing the drill-type power tool of the present invention, in an impact mode;

Figure 11 is a cross-sectional view taken along line D-D of Figure 10;

Figure 12 shows the state in which the bearing sleeve teeth 131 on the bearing sleeve 13 correspond to the positions of the grooved teeth 112 on the grooved disk 11 on the output shaft assembly;

Figure 13 shows the state in which the bearing sleeve teeth 131 on the bearing sleeve 13 are combined with the grooved teeth 112 on the slotted disk 11 on the output shaft assembly, that is, the drill-type power tool is in an impact mode;

Among them: 1, support column; 2, front shell; 201, groove; 202, step surface; 203, indicator mark; 3, gear piece; 301, protruding part; 4, pressing ring; 5, elastic parts; Screw cover; 7, adjusting cover; 8, static end tooth; 9, first reset element; 10, moving end tooth; 11, slotted disc; 111, radial rib; 112, grooved disk; 113, slot; , second reset element; 13, bearing sleeve; 131, bearing sleeve teeth; 132, shift fork; 14, output shaft; 141, shoulder; 15, bead; 16, press sleeve; 17, screw; 19; support; 20, adapter plate; 21, planet carrier; 22, planet axis; 24, planetary gear; 25, gear; 26, inner ring gear; 27, plane bearing; 28, mode mark; 261, slope; 701, bump; 702, groove

detailed description

Specific embodiments of the present invention are given below in conjunction with the accompanying drawings.

Referring to Figure 1, a preferred embodiment of the invention is an electroconductive cobalt. Figure 1 is a partial cross-sectional view of the electric drill. When the main control switch of the electrocobalt is triggered (not shown), a motor (not shown) placed at the rear of the electrocobalt (the right side of the figure) is energized and is output at its output shaft. The rotary motion is output, the rotational motion from the motor is shifted by the shift gear set and transmitted to the gear 25, and the planetary gear 24 meshes with the gear 25, and a carrier 21 is coupled to the planetary gear 24 via the planetary shaft 22, an inner ring gear 26 is engaged with the planetary gear 24, and an adapter disk 20 having an internal spline tooth is connected to the inner side of the carrier 21 and cannot rotate relative to the latter, and the outer end of the output shaft 14 of the electric drill is provided with external spline teeth. And incorporated in the inner bore of the adapter disk 20, the rear end of the output shaft 14 of the electric drill is supported on a support 19 fixed in the front casing 2. In the preferred embodiment, the support 19 is fixedly fitted in front. The bearing on the casing 2, as an alternative, the support 19 may also be a hole integrally provided on the front casing or other alternative form that one skilled in the art may associate in accordance with the present invention. The front end of the output shaft 14 is supported on the bearing sleeve 13, and the outer peripheral clearance of the bearing sleeve is fitted to the front end of the inner casing 2, so that the output shaft 14 is well supported, and the rotation from the motor is transmitted to the output shaft 14. And output through the output shaft end.

In order to obtain different outputs at the output shaft end of the electric drill, the electric drill is provided with a structure and a device for switching the working state of the electric drill. The electric drill of the invention can output three kinds of movements of torsion, drilling and impact at the output shaft end, and in the working state of outputting the torsion, the electric drill can perform torque output and adjustment like the screwdriver. Referring to Figures 1 and 6, wherein the front end of the support post 1 abuts against the press ring 4, the rear end abuts against the inner ring gear 26, and one end of the elastic member 5 abuts against the press ring 4, and one end abuts against the screw cap 6. The screw cap 6 is combined with the adjustment cover 7. The adjusting cover 7 is rotated, and the screw cap 6 is moved by the screwing therebetween to compress the elastic member 5 to compress, and the pressing ring 4 is pressed backward to press the supporting column 1 against the front surface of the ring gear 26. The front surface of the ring gear 26 is provided with a plurality of slopes 261 with a circumferentially small inclined surface protruding forward. When the adjusting cover 1 is rotated within the range of the torque adjustment range, the distance S2 between the pressing ring 4 and the screw cover 6 is always greater than The support column 1 has a climbing slope S1 of the inner ring gear 26, such that when the torque acting on the output shaft 14 is greater than the output torque value set by the gun drill, the torque of the output shaft 14 is externally loaded due to the above-described rotational transmission setting. The value of the output torque set by the gun drill causes the inner ring gear 26 to rotate. The support column 1 is forced to move the push ring 4 by the action of the slope 261 provided on the inner ring gear 26, since S2>S1, Thus, the support column 1 climbs over the slope 261 of the end surface of the ring gear 26 to cause a tripping phenomenon, and a hill-climbing sound is emitted, and no output is output at the output shaft 14, at this time, or the screw at the output end (not shown) is It is good in the workpiece (not shown), or it needs to adjust the cover 7 to increase the output torque to make the screw screw into the workpiece (in the figure) Not given). Fig. I and Fig. 2 show the state where the output torque is adjusted to a very small state. Fig. 6 and Fig. 7 show the state where the output torque is adjusted to the maximum, that is, at this time, the electric cobalt is in the critical state of the torque adjustment to the drilling gear. status.

Referring to FIG. 1 to FIG. 7 , the static end teeth 8 provided with teeth on the front end surface are fixedly engaged in the inner cavity of the front shell, and the central hole of the static end teeth 8 is matched with the output shaft 14 . 10 fixedly connected to the output shaft 14, the first returning element 9 is sleeved on the output shaft 14, the rear end of the first returning element 9 is passed through the stationary end teeth 8 against the support 19, and the front end abuts the moving end tooth In the preferred embodiment, the first reset element 9 is a spring, but other elastic elements that are conceivable by those skilled in the art may also be used herein as an alternative. In a preferred embodiment, the inner cavity of the front case 2 is formed with at least one axially extending groove 201 and a stepped surface 202, and the grooved disk 11 is provided with a shape and a number corresponding to the groove 201. The rib 111 is engaged with the groove 201 on the front case 2 through the radial rib 111, and the groove plate 11 is seated on the step surface 202 on the front case 2. At least one bead 15 is received in the recess 201 on the front case 2. a press sleeve 16 is sleeved on the output shaft 14 and fastened to the front end of the front case 2 by a screw 17, the rear end of the bead 15 abuts against the groove plate 11, and the front end abuts against the pressure sleeve 16 on. Alternatively, the grooved disk 11 may be integrally formed on the inner cavity of the front case 2, which will increase the outer peripheral circumference of the front case, but the processing and installation of the bead and the groove 201 are omitted. A better design. The front end surface of the groove plate 11 is provided with grooved teeth 112. In the preferred embodiment, the grooved disk teeth are axially notched or convex, and the bearing sleeve 13 is movably coupled to the output shaft 14 on the rear end surface of the bearing sleeve 13 Bearing sleeve teeth 131 are provided, and the position and shape of the bearing sleeve teeth 131 correspond to the position and shape of the grooved disk teeth 112 on the groove plate 11. In the preferred embodiment, the bearing sleeve teeth 131 are projections or recesses that correspond in position and shape to the grooved teeth 112. The second restoring element 12 is disposed between the bearing sleeve 13 and the slotted disk 11. In the preferred embodiment, the second restoring element 12 is a spring, one end of which is snapped into the slot 113 on the slotted disk 11, and the other end is stuck The rear end of the bearing sleeve 13. In a preferred embodiment, the front side of the bearing sleeve is provided with a recess, and the recess receives a flat bearing 27 sleeved on the output shaft 14. The front end surface of the flat bearing 27 is placed on the shoulder 141 of the output shaft 14, which can be placed here. The friction between the bearing sleeve 13 and the shoulder 141 is greatly reduced. Since the shoulder 141 partially protrudes from the hole of the adjusting cover 1, when the drill chuck 18 is threadedly coupled to the front end of the output shaft 14, the rear end surface of the drill chuck 18 abuts against the front end surface of the shoulder 141. . When the indicating arrow of the adjusting cover 7 refers to the drilling position, the distance S2 between the pressing ring 4 and the screw cover 6 is smaller than the climbing height S1 of the support column 1 and the inner ring gear 26, when the electric cobalt is subjected to an external load, although the output shaft The outer load received by the 14 places causes the inner ring gear 26 to rotate by the above-described rotation transmission setting, and the support column 1 is forced to move the push ring 4 backward, but since S2 < S1, at this time, the support column 1 is not sufficient. The receding space is moved back over the ramp 261 of the ring gear 26 to prevent the tripping phenomenon, and the output end of the output shaft 14 is constantly outputted to keep the drilling state of the electric drill.

When the indication arrow of the adjusting cover 7 is in the impact mode, the inner convex point 701 of the adjusting cover 7 rotates the bearing sleeve 13 from the drilling position to the impact position. After rotating a certain angle, referring to FIG. 9, the bearing sleeve 13 and Relative position of the tray 11 The setting has changed, see Figures 3 and 12 for details. In the torque output and the drilling position, as shown in FIGS. 1 to 8, the bearing sleeve teeth 131 on the bearing sleeve 13 are attached to the end faces of the groove plates 11, and the output shaft 14 cannot be moved backward. There is a gap between the teeth 10 and the teeth of the stationary end teeth 8, which cannot be engaged, and the output shaft 14 does not output an impact motion. In the gear position shown in Figs. 10 to 13, the bearing sleeve teeth 131 on the bearing sleeve 13 correspond in position and shape to the position and shape of the grooved disk teeth 112 on the end surface of the grooved disk 11, and are designed to The meshing effect of the movable end tooth 10 and the static end tooth 8 is optimal, and the distance HI is set slightly larger than the distance H2, so that when the drill chuck 18 is subjected to the axial backward load, the output shaft 14 can be moved backwards. The end teeth 10 and the stationary end teeth 8 can be fully meshed, and the output shaft 14 outputs a rotational and impact motion. In the impact mode, the distance S2 between the pressing ring 4 and the screw cap 6 is smaller than the climbing height S1 of the support column 1 and the inner ring gear 26, the principle is the same as when drilling the gear, and the support column 1 cannot climb over the front end of the ring gear. On the slope 261 on the surface, the electric drill does not cause a tripping phenomenon between the support column 1 and the inner ring gear 26, and the output shaft 14 of the electric cobalt constantly outputs an impact motion.

Referring to Figures 2, 4, 7, 9, and 11, a shifting plate 3 is disposed between the front casing 2 and the adjusting cover 7, and the protruding portion 301 thereon has a corresponding position on the inner cavity of the adjusting cover 1. The grooves 702 are detachably or in combination. When the adjusting cover 7 is twisted, the protruding portion 301 continuously slides from one groove 702 into the other groove 702, and the operator can hear the squeaking sound. The design not only makes the adjustment feeling of the adjusting cover 7 good, but also prevents the position adjustment of the electric drill from being inaccurate due to the self-rotation of the adjusting cover 7.

Switching between the impact working state and the drilling working state: Referring to FIG. 4, the grooved disk 11 is engaged with the correspondingly shaped groove 201 on the inner cavity of the front case 2 through the radial rib 111, and passes through the rear end face and the front case inner cavity The upper stepped surface 202 is fitted in the front casing 2, and a second restoring member 12 is disposed between the bearing sleeve 13 and the grooved disk 11. In a preferred embodiment, the resetting element 12 is a spring, one end of which is a slotted disk The slots 113 on the 11 are mated and the other end mates with a hole or slot in the rear end face of the bearing sleeve 13. During the adjustment of the electric drill from the cobalt feed to the impact gear, the rear end face of the bearing sleeve 13 is rotated by rotating the adjusting cover 7 through the inner bump 701 on the bearing sleeve 13 to rotate the latter by a predetermined angle. The upper bearing sleeve teeth 131 are turned to a position corresponding to the grooved teeth 112 on the grooved disk 11, and the bearing sleeve 13 is engaged with the grooved disk 11, and the second returning element 12 is acted upon by the front end load of the output shaft 14 Tightening and compressing, the first returning element 9 is also in an axially compressed state, and relative movement between the movable end tooth 10 and the stationary end tooth 8 can occur. During the rotation from the impact gear position to the drilling position, the inner side protrusion 701 of the adjusting cover 7 no longer limits the bearing sleeve fork 132. First, the main shaft 14 returns to the state of FIG. 3 under the action of the return spring 9, while Under the action of the torsion and axial force of the second restoring element 12, the shifting fork 132 on the bearing sleeve 13 returns to the position shown in FIG. 9 of the drilling position, and the bearing sleeve 131 on the bearing sleeve 13 re-engages with the grooved disk 11 When the upper end platform is in contact, the output shaft 14 cannot produce a rearward axial displacement, and the movable end tooth 10 and the static end tooth 8 are disengaged from each other, and the electric drill cobalt is restored to the drilling state.

Referring to Figures 2, 4, 7, and 9, the outer surface of the adjustment cover 7 is marked with a pattern mark 28, outside the front case 2. The side is marked with an indicator mark 203, and the rotation adjustment cover 7 corresponds to mode switching between the components inside the drill, and the indicator mark 203 is respectively aligned with the corresponding mode mark, thereby visualizing the operation mode switching of the electric drill.

Claims

Rights request:

A drill-type power tool comprising: a front housing (2), an output shaft (14) disposed in the front housing (2), and a movable end tooth fixedly coupled to the output shaft (14) 10) a static end tooth (8), a support (19) connected to the front case (2), and a first reset element disposed between the support (19) and the movable end tooth (10) ( 9), characterized in that: a groove plate (11) is connected to the inner cavity of the front casing (2), and the output shaft (14) passes through the groove plate (11) and the bearing sleeve (13). a second resetting member (12) is disposed between the grooved disk (11) and the bearing sleeve (13), and the grooved disk (11) is provided with a grooved plate on a portion of the bearing sleeve (13) a tooth (112), a portion of the bearing sleeve (13) facing the groove plate (11) is provided with a bearing sleeve tooth (131) corresponding to the groove disk (112), the bearing sleeve tooth (131) The drill-type power tool is in an impact mode of operation when mated with the slotted teeth (112).

2. The cobalt-based power tool according to claim 1, further comprising: an adjustment cover (7), wherein an inner side of the adjustment cover (7) is radially provided with an inner side bump (701), the bearing A shifting fork (132) is radially disposed on the sleeve (13), and the inner side bumps (701) and the shift forks (132) are radially interdigitated.

3. A drill-type power tool according to claim 2, characterized in that a torque adjustment mechanism is provided between the adjustment cover (7) and the front case (2).

4. The drill-type power tool according to claim 3, wherein: the torsion adjusting mechanism comprises: a screw cap (6) matched with the adjusting cover (7) by a thread, and is sleeved in the a pressing ring (4) on the front case (2), a plurality of support columns (1) disposed on the front case (2), and the screw cover (6) and the pressing ring (4) A plurality of elastic members (5).

5. A drill-type power tool according to claim 1, wherein: said second reset element (12) is a torsion spring.

6. The drill-type power tool according to claim 1, wherein: the output shaft (14) is provided with a shoulder (141), and a plane bearing (27) is disposed on the bearing sleeve (13). Between the shoulders (141).

The drill-type power tool according to claim 1, wherein: the inner cavity of the front case (2) is formed with at least one axially extending groove (201) and a stepped surface (202). a radial rib (111) having a shape and a number corresponding to the groove (201) is disposed on the grooved disc (11), and the radial rib (111) and the front shell are

(2) The upper groove (201) is fitted, and the groove plate (11) is seated on the step surface (202) on the front case (2).

8. A drill-type power tool according to claim 7, characterized in that at least one bead (15) is received in said recess (201) on said front casing (2).

9. The drill-type power tool according to claim 8, wherein: a press sleeve (16) is sleeved on the input The shaft (14) is fastened to the front casing (2), the bead (15) is end-butted on the trough (11), and the other end is abutted on the sleeve (16) .

The drill-type power tool according to claim 1, characterized in that: the grooved disk (11) is integrally formed on the inner cavity of the front case (2).